PRE-DRYING DEVICE FOR A DISHWASHER
Provided is a pre-drying device for a dishwasher, said pre-drying device being placeable inside a housing of the dishwasher in addition to a cleaning device and a drying device. The pre-drying device of the embodiment includes at least one orientation device that allows a jet of air to be directed onto depressions in dishes in order to remove leftover rinsing liquid from the depressions in the dishes following the cleaning process.
This application claims priority to PCT Application No. PCT/EP2016/001707, having a filing date of Oct. 14, 2016, based on DE 10 2015 013 364.0, having a filing date of Oct. 16, 2015, the entire contents both of which are hereby incorporated by reference.
FIELD OF TECHNOLOGYThe following relates to a pre-drying device for a dishwasher, a dishwasher with a pre-drying device and a method for pre-drying dishes.
BACKGROUNDA dishwasher is used for the mechanical cleaning of dishes, in which the dishes are first cleaned and then dried. During the cleaning process, the dishes are washed with a detergent. After cleaning, the dishes must be dried. Various drying methods are familiar to us from the state of the art. One familiar drying method is condensation drying. In this, the dishes are heated with a clear rinsing liquid to a set temperature (approx. 70° C.). The heat exchanger in the side wall of the housing is then filled with cold water, so that the hot water remaining on the dishes condenses on the cool wall of the housing. Another form of condensation drying includes a fan, with which the warm, damp air is fed through a closed recirculating air condensation drying system with a heat exchanger filled with cold water, on which the moisture condenses. A zeolith drying system is also known, in which there are small mineral beads in the base of the housing. These absorb the moisture in the drying process and release it only with the next rinsing process. In another drying method, the dishwasher door opens a gap and blows the damp air outside by a fan.
The publication DE 10 2014 001 944 A1 discloses a control process for a dishwasher, for example. In this method, it is primarily a recirculating fan that is housed in a recirculation duct that is operated. The control process controls the rotational speed of a rotor on the recirculating fan. The process also includes the operation of an exhaust fan. This publication also discloses a dishwasher that is equipped, among other things, with a recirculating fan. The recirculating fan removes residual water through evaporation.
However, all these drying methods have the disadvantage that, after the drying process, there is still residual water in the curved depressions on the bottom of upturned vessels. This residual water is particularly unwelcome for the user of a dishwasher, as it demands subsequent drying by hand and can lead, among other things, to deposits or water stains.
The publication WO 2005/060 821 A1 describes a system in which heated air is blown through a lower spray arm upwards into the rinsing tank. This system will dry the dishes more quickly by the heated, moved air, but is unsuitable for removing larger deposits of residual water from depressions.
The publication U.S. Pat. No. 6,053,185 A describes a system in which water is removed from depressions on top of upturned dishes by air pulses. To do this, overhead rails are provided with a multiplicity of air outlets, which are fed simultaneously by a compressor with pulses of compressed air. The air pressure and the volumes of compressed air necessary to achieve a sufficiently intense air pressure at all air outlets cannot be provided with the space available for additional units inside a conventional dishwasher. In addition, according to the publication U.S. Pat. No. 6,053,185 A, the jet of air from each nozzle is distributed, which again would demand higher air pressure and an even greater volume of compressed air. The direction of the air pulses is fixed by the geometry of the air outlets, so that dishes which are not positioned ideally under the air outlets can only be dried inadequately.
SUMMARYAn aspect relates to a pre-drying device that provides efficiently clean and immediately usable dishes, for which the pre-drying device must be integrable in existing systems in a cost-effective, low maintenance, space-saving and easy manner. In addition, an easily operated dishwasher and a method are created which provide efficiently cleaned and immediately usable dishes. These problems are solved by the combinations of the features of the independent claims.
The pre-drying device according to embodiments of the invention is accommodated inside a housing of a dishwasher in addition to and/or in combination with a cleaning device and/or a drying device. For this, the drying device according to embodiments of the invention includes at least one blowing nozzle, through which a jet of air can be directed at depressions in the dishes in the dishwasher or onto positions at which there are depressions in the dishes with an intentional arrangement of the dishes. The term “can be directed” as meant by embodiments of the invention embraces on one hand a static alignment by alignment, such as alignable nozzles, which are aligned before operating the pre-drying device. In particular, the alignment can be aligned before the dishwasher is started for the first time, for example during production. “Can be directed” also embraces a dynamic alignment during operation of the pre-drying device by means of alignment or an alignment device moving during operation and/or by a dynamic control of the air jet on different paths by means of alignment that are not necessarily movable.
With at least one blower nozzle, the dishes can be treated with a jet of air, in particular with a jet of air preferably directed downwards or downwards at an angle, by which rinsing liquid remaining after the cleaning process is removed from depressions in the dishes. The jet of air from the pre-drying device is to be designed strong enough per area and/or unit of time such that the rinsing liquid in the depressions is sprayed and the majority part conveyed out of the depressions. The parameters to be set for the jet of air include air pressure, direction, speed of flow, typical distances from the blower nozzle to the dishes, flow speed out of the blower nozzle, duration and time modulation of the air flow, in particular the pulses of air in the jet and/or the divergence angle and alignment of the jet of air. The crucial factor is that the jet of air is conveyed to the rinsing liquid present in the depressions and suffices to spray the majority of the rinsing liquid over a typical height for the walls of the depressions in the dishes.
The result achieved by such a pre-drying device is that the dishes can be removed from the dishwasher ready to use, as the rinsing liquid remaining in the depressions then no longer has to be dried off by hand.
Moreover, an energy-efficient drying of the dishes can occur when using such a pre-drying device, as the rinsing liquid remaining in the depressions has been removed completely or at least to a considerable degree, and no longer has to be dried off by an energy-inefficient and therefore more expensive and less environmentally friendly heating process. As there is less water on the dishes and in the rinsing tank after the pre-drying process, the actual energy-intensive drying process can take place for a shorter time and/or at a lower temperature, so that less energy is consumed overall by the actual drying and pre-drying for the complete programme.
In conjunction with such a pre-drying device, the cleaning is also more efficient, as the rinsing liquid remaining in the depressions has been removed completely or at least to a considerable degree, which prevents the formation of deposits or water stains on the dishes. Deposits may, for example, be salts, detergent or other soluble or suspended solids in the rinsing liquid, which can be deposited after evaporation, in particular by a thermal drying of the liquid on the dishes. The spraying of rinsing liquid from depressions in the dishes according to embodiments of the invention has the advantage that materials contained in the liquid that cannot evaporate, or do so only with difficulty, are removed together with the liquid.
At least one blower nozzle can be made adjustable as alignment for aligning the jet of air. Alternatively, the jet of air can also be aligned by \ a variable control for a number of fixed blower nozzles. It is also conceivable, in areas above the dish rack, which is for example intended to house dishes of a closely defined form, to accommodate fixed nozzles, cheaper and simpler in terms of design and maintenance and/or in other areas above the dish rack, which is intended to house dishes of different and, where relevant, unknown shapes when designing the dishwasher, to accommodate movable blower nozzles, so that dishes of any shape and alignment will be dried efficiently by directing the jet of air at positions where there might be depressions containing liquid.
At least one blower nozzle can be designed to generate a directed and/or bundled jet of air. A small divergence angle of the jet of air will, for example, result in the jet of air being bundled and thus, for example, even at low air pressures, still has a sufficiently high momentum to spray on the residual water and remove it from the depressions.
An advantageous design of the pre-drying device will provide an air pressure generation device for producing a jet of air. This air pressure generating device includes, for example, a compressor and/or a fan. Advantageously, at least one air duct system is provided, which preferably has at least one blower nozzle. This air duct system is connected on one side with the air pressure generating device and on the other side with at least one blower nozzle. The air duct system can be formed at least in sections as duct, pipe, hose or as another depression body which is suitable for conducting air.
A further advantageous design stipulates that the air duct system includes at least one valve, for which each valve is upstream of a blower nozzle in the direction of the air flow. The valve opens up the path through the air duct system to the exit from the blower nozzle and treats the dishes with a jet of air, or it generates a pulsed jet of air to treat the dishes intermittently with a pulsed jet of air. The pulsed jet of air reaches a higher pressure at the blower nozzle and in the air flow, which causes a more thorough blowing out of the depressions. Thus, efficient pre-drying is achieved in an advantageous manner.
The valves used are preferably controllable via an interface such that the blower nozzles are controllable consecutively and/or in groups by a single controller. Through sequential control of the valves, powerful pulses from the jet of air are generated, even with an air pressure generation device of limited power. Sequences of pulses from a jet of air have the further advantage that, in a first phase, a pulsed jet of air can transfer a momentum to the residual rinsing water and in a second phase, a portion of the residual rinsing water can spray unhindered from the dishes in the opposite direction to that of the pulsed jet of air between two pulses of the jet of air.
In one particular construction, at least one valve is designed as a multi-path valve, which reduces the number of components used and the cost for the controller.
Advantageously, rapid-opening and/or rapid-closing valves are used to control the blower nozzles, for example electromagnetically or electropneumatically controlled valves. This allows particularly precise control of the valves and thus the pulsed jets of air, and the air pressure built up is available immediately over the entire cross-section of the line.
In one particular embodiment, a single valve can control a number of blower nozzles, for example by a slide, which is constructed such that the various blower nozzles release the air flow in a defined order.
The air duct system can include a distributor for distributing the air flow in different sections of the air duct system. The distributor has a number of compressed air outlets, to which, in each case, the duct system routing the air is connected, for example, an air guided rail or a connecting hose to a blower nozzle block. In particular, valves to control the air flow into the routing air conduction system can be placed at the distributor outputs. In an exemplary design of the air conducting rails, the distributors and the valves, can be arranged, say horizontally, so that the air conducting rails are connected directly behind the rinsing tank wall.
In one particular design, the air conducting system and, in particular, the distributor, is designed so that it also assumes the function of a compressed air tank concurrently. In this way, an adequate stock of compressed air can be provided without the need for a separate compressed air tank, which means that the pre-drying device can be designed in a particularly space-saving way.
The distributor is formed, for example as a spherical, cubic or cuboid hollow body, and can represent a part of the rinsing tank wall to save material and space.
For safety, the air duct system can include a pressure relief valve on the pressure build-up side, for example at the distributor, which can allow too high a pressure to escape from the air duct system, if need be.
In another advantageous construction, it is stipulated that a number of blower nozzles be positioned rigidly and/or a further number of blower nozzles adjustably inside the dishwasher on the air duct system, such as an air conducting plate and/or a grid, and/or the housing. An advantageous design of the air duct system includes a grid, to which several blower nozzles are fitted on the longitudinal and/or transverse sections of the grid. This has the advantage that rinsing water can run unobstructed through the grids and does not remain lying on the surface.
Depending on the design of the air duct system, it can be advantageous to provide additional blower nozzles, for example in air conducting rails on the side housing walls, by the side at the dish rack, in order to treat the dishes at the edge reliably with a jet of air, in particular under the folding shelves. In a further advantageous construction, blower jets, whose air supply is coupled by pushing the dish rack into the rear wall of the rinsing tank, are fitted directly on the underside of the folding shelves.
The blower nozzles are controllable by valves sequentially or in groups, preferably via an interface, so that air pressure is available in adequate quantities at the individual blower jets.
The movable blower nozzles can be swivelled, preferably by a suitably set angle range, for example. A movement of the blower nozzles in a given range of angles is sensible, so that the blower nozzles are matched to different alignments of the openings of depressions on the dishes to be treated and it is certain that even with different alignments, which can occur, for example, by incorrect arranging of the dishes inside the dishwasher, a blowing off of rinsing liquid from the depressions is reliably guaranteed.
The movable blower nozzles can, for example, be designed so that these are supported at the base of the nozzles in a spherical or axial joint and, for example, can be moved in one or more directions, individually or as a group, via a control element, for example a tension rod, plate, tab, a slide and/or a disk on the nozzle output side of the joint.
In a further advantageous embodiment, only the blower nozzle heads are movable. For example, a rotating nozzle head is supported by a nozzle essentially pointing downwards, such that the nozzle head continues to turn through a defined range with each air pulse, for example a quarter of a revolution, so that the jet of air can blow on to a much greater area on the dishes arranged below than with a head that does not rotate.
In a further advantageous embodiment, the air duct system is formed as a rail system with at least one rail. At this rail, blower nozzles or one, two or more blower nozzle blocks are fitted, which are moved by a drive. This rail system is arranged so that, through the blowing nozzle process, all the dishes or at least the majority (for example all glasses and cups, which typically have voluminous depressions when standing upside down and are arranged in the top rack of the dishwasher) are treated reliably by the blower nozzles with a jet of air. Depending on the design of the rail system, two or more rails can also be provided to ensure reliable blowing off of the dishes. In the simplest case, the rails are arranged from front to back as two parallel, straight rails horizontally above the dish rack. However, the rails can also be arranged in the form of a U, a circle or as a number of rails in the longitudinal and/or transverse direction. For uniform movement of the blower nozzles or blower nozzle blocks, it is advantageous to fit one or more guide rails.
By a construction of the nozzle blocks that is as flat as possible, the interior volume of the rinsing tanks is restricted only minimally, and it is guaranteed that, during the process, the nozzle blocks do not collide with the dishes. For this, the blower nozzles can advantageously be for the most part inside the blower nozzle block. Only the head of the nozzle protrudes from the blower nozzle block.
The drive for moving the blower nozzles and/or nozzle blocks works either in a stepped manner or continuously. With a stepped movement, a jet of air is directed at the dishes after every step at different positions respectively.
An advantageous construction of the drive is designed so that a friction clutch is integrated into the drive and this responds if the driven blower nozzle or the driven blower nozzle block encounters an obstacle, for example a part of the dishwasher load that is too high. The friction clutch works such that the blower nozzle or blower nozzle block dwells in front of the obstacle until it goes into reverse, and therefore there is no damage to the dishwasher or to the dishes.
The drive provided in some embodiments can concurrently be formed as a coupling point for the air flow. Among other things, the drive can be designed as a geared drive, which consists of two toothed disks engaging with each other. Both rotation axes of the toothed disks are formed as cylindrical hollow bodies, which therefore represent a part of the air duct system. The toothed disks engaging with each other also guarantees ducting of the air, as this interconnects the two air ducts of the geared drive. A rubber seal is also provided, which consists of at least one rubber ring, which is designed such that it becomes self-sealing when the toothed disks engage. In addition to a geared drive, all drives that afford the opportunity to form a coupling point are also conceivable. In addition, other means of sealing, which can act in a self-sealing manner on connecting both drive parts, are also conceivable.
In one advantageous embodiment, the drive, e.g. an electric motor, is behind the wall viewed from the rinsing tank and merely penetrates the wall with a thin shaft inside a sealed bearing. In the rinsing tank, a spindle with a worm drive is flanged to the protruding shaft, for example, and this can move forwards and backwards through the rotary movement of the blower nozzle block. The blower nozzle block is created, for example, as a hollow body on the side facing the wall and is placed in its end position via the penetration of the wall and thus also seals this during the rinsing process.
It is also conceivable that the power transfer from the drive into the rinsing tank, for example on a spindle, is carried out without penetrating the rinsing tank wall. For this, for example, a number of magnets can be connected to the drive. If the magnets are moved by the drive, this movement can be transferred by a magnetically permeable section of the rinsing tank wall, for example made from plastic, to a further number of magnets inside the rinsing tank, which are connected with a spindle, for example. In this way, no rinsing liquid can reach the drive and damage it.
In one advantageous design, the drive is a compressed air drive. This construction has the advantage that, for the drive, only one compressed air connection hose has to be fed to the inside of the rinsing tank and thus no mobile penetration of the wall, which can lead to leaks, is necessary. The compressed air drive is implemented by a compressed air technique, familiar from the state of the art and matched to the conditions. The connection hose can be fitted separately or in combination with the connecting hose for connecting the nozzle blocks.
A drive by a compressed air drive can be implemented in steps, for example by two counter-rotating geared disks which continue to turn through a defined range with each air pulse, and move the blower nozzle blocks in steps. The compressed air drive is preferably designed so that a defined number of air pulses is always released on to the drive between blowing off air pulses, in order to guarantee that the blower nozzle block covers a defined distance between the blowing off processes.
In one specimen version, the drive includes a movably borne worm drive on a threaded spindle. The compressed air drive is advantageously located at the end of the threaded spindle and moves the spindle in a defined rotary movement with each pulse of air. The worm drive thus moves the blower nozzle block in a forwards or backwards motion. The connections for the drive are, for example, integrated directly into the wall of the rinsing tank.
An alternative embodiment of the drive stipulates that the threaded spindle be fitted as a fixed component in the dishwasher and the worm drive, for example, implemented with a cylinder rotating in bearings inside the blower nozzle block. The rotating movement is implemented by the cylinder, for example by an engaging recirculating groove as actuator between cylinder and blower nozzle block in a linear movement.
The blower nozzle blocks drive and the toggle and end positions can be regulated via position sensors and/or limit switches and an interface, via which the number of air pulses are submitted to the drive, and/or regulated by a time schedule. For example, a blower nozzle block moves from a rear end position forwards to a toggling point and back into the end position. The next blower nozzle block can then move to the next area.
After the pre-drying stage, according to embodiments of the invention, you can check whether the blower nozzle blocks are in the end position. This avoids error functions caused by an incorrect start position, for example because a blower nozzle block was moved when loading the dishwasher. If the blower nozzle blocks are not in the end position after pre-drying, these can be moved into the end position, for example controlled by the interface.
In one advantageous embodiment, at least one, but ideally several, e.g. four, blower nozzles are fitted to a blower nozzle block. In another advantageous embodiment, two rows of blower nozzles are fitted to a blower nozzle block respectively. The first row of blower nozzles is, for example, directed to the left and activated during the forward movement of the blower nozzle block. The second row of blower nozzles is, for example, directed to the right and activated during the backward movement of the blower nozzle block. This could, for example, be used in a construction with two nozzle blocks, each with two rows of four nozzles. This distribution ensures that the entire surface of the dish rack is reached with a relatively low compressor output, which in each case has to supply only four blower nozzles.
Both rows of nozzles and the forward and reverse drive are controlled with this, for example, via four separate hoses that are charged sequentially with compressed air via the distributor.
In a further advantageous embodiment, the blower nozzles are fitted to the blower nozzle block so as to be movable. The nozzles can be moved continuously during the process or, for example, directed to the left during the forward movement and folded to the right on beginning the backward movement. This arrangement means or device that an area drying result is achieved with a lower number of blower nozzles.
The air outlet openings on the inside of the rinsing tank housing, as well as the air inlet openings in the drive and in the blower nozzle block are all advantageously arranged horizontally in one plane, so that the connection hoses between air outlet openings and air inlet openings have to be moved only in one horizontal plane and can thus be more easily guided without protruding into the rinsing tank area.
For simpler guidance of the connection hoses needed, according to the design of the blower nozzle blocks, these are, for example, grouped in dual or multiple hoses.
In order to counter sagging and thus a protrusion into the rinsing area, in one advantageous embodiment, a number of vertical bridges, moving horizontally, preferably made from stainless steel or from plastic, are incorporated into the connection hoses and these stabilise the horizontal movement of the connection hoses. Alternatively, a vertically configured chain, as is familiar from robot and mechanical engineering, can also prevent sagging. For example, in the lower area of the chain, lateral overhangs are fitted and these support the connection hoses.
In a further advantageous embodiment, a hose reel is fitted in the area of the blower nozzle blocks. The reel works in a similar manner to a cable drum, familiar from standard technology, and acts through the prestressed spring force or through the winding on or off coupled to the movement of the blower nozzle block to prevent the connection hoses sagging and protruding into the rinsing area. Ideally, the hose reel is designed around a vertical axis and is to be found in front of the rinsing tank rear wall or directly on the blower nozzle block, so as to take up as little space as possible.
The connection hoses can also be held by, for example, a rope kept under tension via weights or springs, so that they do not protrude into the rinsing area.
In another advantageous embodiment, the air duct system consists of at least one rotating disk, to which blower nozzles are fitted. In this design, several blower nozzles are fastened to a disk such that all the dishes to be treated are loaded adequately with a jet of air through the rotation of the disk. To ensure efficient blowing off of the depressions, the blower nozzles can be distributed on the disk so that, in a radial direction to the outer edge of the disk, there is a greater number of blower nozzles on the disk in the direction of the circumference of the disk to compensate for the shorter resting time of the outer blower nozzles over the relevant dish depressions. In addition, it can be advantageous to provide two, three or four identically designed disks inside the housing. In all these variants, the rotation of the disk can be generated optionally by an electric, pneumatic or hydraulic drive and/or via the blower nozzles themselves and be implemented stepped or continuously. A stepped drive enables the movement of the disk to be matched advantageously to the air pulses from the blower nozzles carried by it. A possible drive is implemented via the blower nozzles, for example via the alignment of the blower nozzles such that the blowing direction is in a plane that is fundamentally at right angles to the rotational axis of the disk.
In a further advantageous embodiment, the air duct system is formed as a, particularly stepped, rotating blow-off arm, which is provided in addition to a spraying arm. In addition, in one advantageous design, at least one spraying arm of the dishwasher is formed concurrently as a blow-off arm. This offers the advantage that no additional element has to be implemented in the dishwasher. In this special design, the spraying arm ducts function as air ducts, e.g. following the cleaning process. Alternatively, a part of the air duct system and/or the blower nozzles of the pre-drying device can be fitted to at least one spraying arm. Furthermore, it is advantageous if the blow-off arm cited can be optionally made as an eccentric. Such a design of the blow-off arm offers the advantage that even dishes located in the corners of the dishwasher racks can be treated reliably with a jet of air. On all variants of the blow-off arm, at least one blower nozzle is fitted, so that all the dishes to be treated can be treated adequately with a jet of air due to the rotation of the blow-off arm. To ensure efficient blowing off of the depressions, the blower nozzles can be distributed on the blow-off arm such that there is a greater number of blower nozzles at the outer edge, in order to compensate for the shorter resting time of the outer blower nozzles over the relevant dish depressions. In all these variants, the rotation of the blow-off arm can be generated optionally by an electric, pneumatic or hydraulic drive and/or via the blower nozzles themselves. A possible drive is implemented via the blower nozzles, for example via the alignment of the blower nozzles such that the blowing direction is in a plane that is fundamentally at right angles to the rotational axis of the blow-off arm.
In a further advantageous embodiment, the air duct system is designed as a number of air rails, preferably in a longitudinal direction over the entire depth of the disk rack, which is fitted with a number of blower nozzles. These blower nozzles are preferably rigid, or designed to be movable in at least one spatial direction or relative to at least one swivelling axis. If a dish holding device, such as the top dish rack, for example, has five setting rows, then each is preferably fitted with rails, populated by blower nozzles, centrally over the relevant setting row, if the dish holding device is in a closed dishwasher. Furthermore, additional air rails populated with blower nozzles can be fitted to the housing walls or to the sides of the dish rack, in order to treat the dishes at the edge, especially under the folding shelves, reliably with a jet of air. The blower nozzles inside an air rail can also be subdivided once more into rows or groups separated in the air side. The total number of blowers is controllable by valves sequentially or in groups, preferably via an interface, so that air pressure is always available in adequate quantities at the individual blower jets. By a configuration of fixed rails populated with blower nozzles on top, with additional rails at the side populated with blower nozzles, a reliable blowing off of the dishes to be treated can be guaranteed, as the dishes can be treated reliably both from above and from the sides with a jet of air.
In a further advantageous embodiment, several air nozzle rails or in each case at least one multi-duct air rail are fitted over each setting row, with which blower nozzles showing preferably in different directions, reach a greater area of the dish rack with the jet of air and thus blow off large size dishes or dishes that are not set correctly. A multi-duct air rail can, for example, be designed as a 3-duct air rail, in which each duct is, for example, assigned four to six blower nozzles. The individual ducts or air rails can be treated sequentially with air by a distributor, so that even with a low power air device, there is always enough pressure available to blow off the dishes.
In a further advantageous construction, a sub-distributor is assigned to at least one multi-duct air rail, to which it is integrated and/or fitted. This has the advantage that only one line has to be installed to the multi-duct air rail from the main distributor and the main distributor also has to have only a manageable number of valves and/or outlets. The individual ducts of a multi-duct air rail are controlled by individual valves upstream of each duct or, for example, by a rotatable perforated disk which always releases access to a single duct. The perforated disk or another sub-distributor is adjusted, for example, with each air pulse, which is released onto the blower nozzles from the main distributor, or with a pulse of air controlled separately.
In a further advantageous design, the sub-distribution of several multi-duct air rails is controlled centrally, for example by a common slide. In addition, the same ducts are always released in parallel by all air rails, but invariably only one multi-duct air rail is treated with compressed air by the main distributor. Central control of the sub-distribution reduces the number of components to be used, as well as the cost for the controller.
In a further advantageous embodiment, the air rails are fitted in the dishwasher so as to be movable. For example, by a servo motor and/or pneumatically, the air rails are moved either individually or as a group. Preferably, the air rails are designed so that they tilt about a vertical axis to the right and/or to the left and/or can be moved forwards and/or backwards. The air rails move such that, with the jet of air, each blower nozzle reaches a greater area of the dish rack with the jet of air and thus large size dishes and/or dishes that have been set incorrectly are blown off
The embodiment is also aimed at a dishwasher that also has a pre-drying device in addition to the cleaning device and the usual drying device. The blower nozzles of the pre-drying device are arranged in the dishwasher above at least one part of the dishes and treat the dishes arranged under it with a jet of air. In this specimen embodiment, the pre-drying device is fitted on top, under the top inside surface of the rinsing tank and/or under a cutlery drawer and/or under a dish rack. This ensures that the pre-drying process is executed reliably in every level of the dishwasher. If the dishwasher includes a cutlery drawer, the blower nozzles of the pre-drying device are either connected rigidly with the rinsing tank, or a number of blower nozzles is fitted with a rear air feed coupling on the underside of the cutlery drawer. Accordingly, the pre-drying device can also be fitted in the area under the top dish rack.
An advantageous design of the dishwasher stipulates that, in the construction with integration of the air duct system in the cutlery drawer or in one of the dish racks with complete insertion of the relevant drawer or the relevant dish rack, the air feed is coupled in an airtight manner, preferably with conical rubber seals, so that the air generated by the air pressure generation device can reach up to the blower nozzles. This coupling functions in a similar way to that of the water distribution coupling points to the spray arms in conventional dishwashers.
The blower nozzles of the pre-drying device are, in one advantageous embodiment, arranged behind a height limiter, so that dishes that are set too high while the dish rack is being pushed in remain suspended at the height limiter and are placed differently or at another point. The height limiter is, for example, at the top front edge of the rinsing tank or at the bottom edge of the cutlery drawer or the upper dishwasher rack. Here, the height limiter can also be used as a grip to pull out the cutlery drawer or the dish rack. The height limiter acts to make the pre-drying device less liable to malfunctions, as the blower nozzles are not prevented from their function by contact with parts of dishes.
A further advantageous embodiment of the dishwasher provides that the air pressure generation device feeds air from the inside of the dishwasher and/or from outside the dishwasher. Hygienic criteria are also met by using filters, separators and similar add-on components. For this, the air pressure generation device can consist of a compressor and/or a fan. In addition, a compressed air tank can be stipulated, in order to provide a constant stock of compressed air. When feeding air from outside, a pressure relief valve is advantageously provided on the rinsing tank, by which excessive pressure occurring inside the rinsing tank during the blow-off process in the dishwasher environment can be discharged. Alternatively, it can be stipulated that excessive pressure be discharged through the dishwasher drainage device. To maintain the odour trap by a siphon, in this case some water can be added again after pre-drying, for example by the existing dishwasher controller.
A compressor and compressed air tank can be integrated into the dishwasher, or even provided externally and connected on the air side.
In a further advantageous design of the dishwasher, at least one dish support device is provided. This dish support device has dish housing devices, whose alignment is complementary to the alignment of the fitted blower nozzles. The dish housing device includes placement areas and/or mountings, which are arranged such that the openings of depressions pointing upwards from dishes placed against a blow-off device are aligned with at least one blower nozzle. The provision of such placement areas or mountings offers the advantage that the blower nozzles can be pre-set directly to a certain angle or to a range of angles which is ideal for treating the dishes, which produces more efficient blow-off. In addition, such dish housing devices can counter tipping over of the dishes.
The embodiment is also aimed at a method which is used for the pre-drying of dishes in a dishwasher. This method includes at least the following steps:
Arranging dishes in the dishwasher;
Treating the dishes with at least one rinsing liquid;
Generating a jet of air by an air pressure generation device;
Provision of the jet of air to at least one blower nozzle via an air duct system;
Directing the jet of air at depressions in the dishes in the dishwasher or at positions of depressions with the intended arrangement of the dishes;
Treating the dishes from above and/or from the sides with a jet of air through at least one blower nozzle.
The treatment of the dishes from above is derived from the arrangement of the pre-drying device, which is always assigned to at least one part of the dishes. It is also advantageous if the treatment is administered with a jet of air or with pulsed jets of air. By using pulsed jets of air, the dishes can be treated in pulses with a higher air pressure, which produces a more efficient blow-off
After running the pre-drying process, there is, at the beginning of the conventional drying process, no or little residual water in the curved depressions on the bottom of upturned vessels, so that the dishes are almost completely dried using the drying process familiar from the state of the art.
With a pre-drying process with a number of air rails, the method can, for example, go as follows: after the final rinse, a compressor switches on and builds up an air pressure in the compressed air tank which, for example, consists of a distributor and connection hoses. If a pre-defined pressure is reached, a first compressed air output valve on the distributor opens briefly and releases a short burst of air on to the dishes through a connected air rail in a first setting row of a dish rack. After a short pause, the compressor has again built up the required pressure in the compressed air tank and a second compressed air output valve in the distributor is opened briefly. The process continues running until all compressed air output valves of the distributor have been opened at least once. The compressor is then switched off and the conventional drying process begins. The process can run similarly with other designs of the pre-drying device.
Some of the embodiments will be described in detail, with reference to the following figures, wherein like designations denote like members, wherein:
Although the present invention has been disclosed in the form of preferred embodiments and variations thereon, it will be understood that numerous additional modifications and variations could be made thereto without departing from the scope of the invention.
For the sake of clarity, it is to be understood that the use of “a” or “an” throughout this application does not exclude a plurality, and “comprising” does not exclude other steps or elements. The mention of a “unit” or a “module” does not preclude the use of more than one unit or module.
REFERENCE SIGNS
- 1 Pre-drying device
- 2 Blower nozzle
- 3 Dishes
- 4 Opening
- 5 Depression in the dishes
- 6 Air duct system
- 7 Plate
- 8 Drive
- 9 Drive coupling gears
- 10 Rinsing liquid
- 11 Air guide rails system
- 12 Spray arm
- 13 Disk
- 14 Blow-off arm
- 15 Eccentric
- 16 Rotation axis
- 17 Air rail
- 18 Side air rail
- 19 Guide rail
- 20 Duct
- 21 Blower nozzle block
- 22 Blower nozzle grid
- 23 Compressed air drive
- 24 Spindle
- 25 Limit switch
- 26 Connection hose
- 27 Ball
- 28 Groove
- 29 Perforated disk
- 30 Distributor/Main distributor
- 31 Sub-distributor
- 32 Actuator unit
- 33 Hole
- 34 Bridge
- 35 Retractor
- 40 Joint
- 41 Control element
- 50 Outside nozzle head
- 51 Inside nozzle head
- 52 Nozzle head
- 53 Inhibiting element
- 54 Sphere
- 55 Spring-loaded connection
- 60 Magnet
- 61 Inside wall section
- 91 Air guiding rotation axis
- 92 Rubber seal
- 100 Dishwasher
- 101 Spray wheel
- 110 Interior
- 111 Housing
- 112 Cleaning device
- 113 Drying device
- 114 Dish rack/dish holding device
- 115 Dish housing device
- 116 Placement area
- 117 Mounting
- 118 Valve
- 119 Controller
- 120 Air pressure generating device
- 121 Compressed air tank
- 122 Cutlery drawer
- 123 Height limiter
- 124 Pressure relief valve
- A-A′ Sectional axis
E1 Compressed air inlet for forward movement
- E2 Compressed air inlet for backward movement
- H Cavity
- R Blow-off direction
- L Jet of air
- V Hollow
- Z Sectional axis
Claims
1. A pre-drying device for a dishwasher, in which the pre-drying device is arranged inside a housing of the dishwasher in addition to a cleaning device and a drying device
- wherein
- the pre-drying device includes at least one alignment device, by which a jet of air can be aligned onto depressions in the dishes, in order to remove rinsing liquid remaining after the cleaning process from the depressions in the dishes.
2. The pre-drying device in accordance with claim 1, wherein the at least one alignment device includes a movable blower nozzle for aligning the jet of air, in which the blower nozzle is designed to generate a directed and/or bundled jet of air.
3. The pre-drying device in accordance with claim 1, wherein the pre-drying device includes an air pressure generating device for generating a jet of air.
4. The pre-drying device in accordance with claim. 1, wherein the pre-drying device includes an air duct system.
5. The pre-drying device in accordance with claim 1, wherein the air duct system is equipped with at least one blower nozzle and/or at least one distributor.
6. The pre-drying device in accordance with claim 1, wherein the air duct system includes at least one valve, in which each valve is upstream of at least one blower nozzle in the direction of the air flow for constant or pulsed treatment of the dishes with a jet of air,
7. The pre-drying device in accordance with claim 6, wherein the valves can be controlled via an interface, such that the blower nozzles can be controlled sequentially and/or as a group by a controller.
8. The pre-drying device in accordance with claim 1, wherein a number of blower nozzles are arranged rigidly and/or a further number of blower nozzles movably inside the dishwasher (in/on a dish holding device and/or a cutlery drawer of the dishwasher, the air duct system and/or the housing.
9. The pre-drying device in accordance with claim 4, wherein the air duct system consists of a rail system, including at least one rail, on which blower nozzles or one, two or more blower nozzle blocks are arranged so that they can be moved by a drive.
10. The pre-drying in accordance with claim 4, wherein the air duct system includes at least one rotating disk, on which blower nozzles are arranged.
11. The pre-drying device in accordance with claim 4, wherein
- the air duct system is formed as a blow-off arm, in which a spray arm for the dishwasher rinsing liquid is also formed as a blow-off arm, or in which the blow-off arm is fitted in addition to the spray arm, and/or the blow-off arm is formed as an eccentric.
12. The pre-drying device in accordance with claim 4, wherein the air duct system is formed as a number of single or multi-duct air rails, to which is fastened a number of blower nozzles, and/or the air rails are arranged above the dishes and/or as side rails at the side of the dishes fixed and/or movably.
13. A dishwasher including a housing with an interior for housing dishes, a cleaning device for treating the dishes with a rinsing liquid and a drying device for drying the dishes,
- wherein
- inside the housing is at least one pre-drying device in accordance with claim 1 above at least a part of the dishes.
14. The dishwasher in accordance with claim 13, wherein the air pressure generating device
- a. feeds air from the inside of the dishwasher and/or from outside the dishwasher and/or includes a compressed air tank.
15. The dishwasher in accordance with claim 13,
- wherein at least one dish holding device is provided, having dish housing devices, whose alignment is complementary to the alignment of the configured blower nozzles, in which placement areas and/or mountings for the at least one dish holding device are arranged such that openings from depressions on the dishes pointing upwards on the dish housing device are aligned against a blow-off direction from at least one blower nozzle.
16. A method for pre-drying of dishes a dishwasher, embodying arranging dishes in the dishwasher; treating the dishes with at least one rinsing liquid; generating a jet of air by an air pressure generation device; providing the jet of air to at least one blower nozzle above an air duct system aligning the jet of air on depressions in the dishes; treating the dishes from above and/or at an angle with a jet of air by at least one blower nozzle in the air duct system.
- the following steps:
17. The method in accordance with claim 16,
- wherein the treatment is carried out with a jet of air by pulsed jets of air.
Type: Application
Filed: Oct 14, 2016
Publication Date: Feb 21, 2019
Inventor: TORSTEN WEIGLE (Neuhäusel)
Application Number: 15/763,125