Abstract: An air compressor includes a rotating device pivotally connected to a piston body. The rotating device includes a gear body and a counterweight. The gear body is formed together with a counterweight, wherein the counterweight is provided with a crankshaft corresponding to the center of the gear body and a crankpin placed at a distance from the crankshaft. The counterweight is horizontally divided into two integrally formed halves, including a left half and a right half, with a common line connected between the center of the crankshaft and the center of the crankpin, wherein the left half has a weight different from the right half, so that the piston body gathers more rotational momentum from the counterweight at BDC to facilitate upstrokes, so that the piston body can conduct reciprocating motion more smoothly, and thus the service life of the air compressor can be increased.

Abstract: A permanent magnet embedded electric motor includes a slit and a flux barrier. A hole defining portion of a magnet insertion hole includes an extended portion. The extended portion projects toward an interpolar core portion in a rotor core in an area positioned further on an outer side of a circumferential direction with respect to a width-direction end surface of a permanent magnet. (Lb) is larger than (La), and (Lc) is smaller than (Ld), where the (La) represents a distance between the slit and the core outer peripheral surface; the (Lb) represents a distance between the slit and an outer peripheral-side surface of the permanent magnet; the (Lc) represents a shortest distance between the extended portion and the interpolar core portion; and the (Ld) represents a thickness of the permanent magnet.

Abstract: An improved air compressor includes a cylinder fitted with a piston body and an air storage container. The cylinder and the air storage container are detachably assembled to define an air chamber. A metal seat with a through hole is provided on top of the cylinder. A valve plug is spring-biased against the metal seat. The air storage container is provided with an elongated pressure indicator, which includes a transparent tube defining therein a first bore and a second bore, between which a tapered annular surface is formed. When the air pressure within the air storage container exceeds a predetermined pressure set for the air compressor, the elongated pressure indicator allows excess air to flow into the first bore of the transparent tube and pass through the tapered annular surface to be released to the ambient environment, so that objects can be prevented from damages due to excessive inflations.

Abstract: A linear compressor may include a shell, a cylinder provided in the shell to define a compression space for a refrigerant, a frame to fix the cylinder to the shell, a piston reciprocated within the cylinder, a discharge valve disposed on or at one side of the cylinder, a discharge cover coupled to the frame and having at least one chamber to reduce pulsation of the refrigerant discharged through the discharge valve, and a valve spring disposed on the discharge cover to provide a restoring force to the discharge valve. The discharge cover may include a cover body having a discharge hole, through which the refrigerant discharged through the discharge valve may be discharged outside of the discharge cover, and a guide passage defined in the cover body to guide at least a portion of the refrigerant discharged through the discharge valve into the at least one chamber.

Abstract: Dual cylinder and single cylinder rocking piston compressors with sound attenuation are disclosed. Due to the tapered shape of the intake and exhaust chamber sides and tops, the gas flow is accelerated and decelerated through the compressors thereby allowing sound energy to be dissipated. Sound attenuation is further enhanced by the addition of baffles, which divide each chamber into a series of smaller attenuation chambers. The baffles also cause the gas flow to accelerate and decelerate as the gas flow passes the baffles. In the case of a dual cylinder rocking piston compressor, enlarging the crossover passageway diameters also creates additional sound attenuation chambers, which contribute to the overall reduction in sound. Further, by using dedicated seals for each intake in the exhaust chamber, flow leakage at higher pressures is decreased, thereby improving compressor efficiencies.

Abstract: An oral irrigator including a fluid reservoir, a pumping assembly, a pressure control assembly, and a nozzle. The pumping assembly comprises a power source, a motor in electrical communication with the power source, and a pump in fluid communication with the reservoir. The pressure control assembly is in fluid communication with the pump; mechanically varies a pressure of a fluid exiting the nozzle to change the outlet pressure of the oral irrigator a high pressure to a low pressure and vice versa.

Abstract: An electric submersible pump (ESP) inverted shroud assembly is described. An ESP assembly includes an inverted shroud separating an ESP pump from a well casing, the ESP pump rotatably coupled to an ESP motor, the inverted shroud having an opening on an upstream terminal side, at least a portion of the ESP motor extending through the opening, the portion of the ESP motor extending through the opening exposed to working fluid, and the opening sealed to the working fluid. An ESP assembly includes an inverted shroud, and an ESP motor including a head, housing and base, the head of the ESP motor at least partially inside the inverted shroud, and the housing and base of the ESP motor at least partially outside the inverted shroud.

Abstract: A compressor having a simplified structure includes a rotation shaft having a spiral groove formed in an outer circumferential surface of the rotation shaft, and a cap member that accommodates a lower portion of the rotation shaft so that the rotation shaft can rotate in the cap member. The cap member may be fixed to one of a stator and a frame such that the cap member does not rotate together with the rotation shaft. Through the simplified structure, oil stored in a sealing case can ascend, and noise caused by rotation of the rotation shaft can be reduced.

Abstract: A motor apparatus includes a motor having a first active part and a second active part, the first active part having a plurality of separately controllable windings, a control unit comprising a processing unit and for each of one or more of the windings a motor module, wherein the motor module has a power converter.

Abstract: A hydraulic system (1) is provided comprising a supply port arrangement (P, T), a working port arrangement (A, B), and a booster section (7), said supply port arrangement having at least a supply port (P), said booster section (7) being arranged between said supply port arrangement (P, T) and said working port arrangement (A, B). The operational possibilities of such a hydraulic system should be extended. To this end said working port arrangement comprises at least two working ports (A, B), flow direction changing means (9) are provided changing a flow direction through said working port arrangement and inactivating means (16) are provided inactivating or activating said booster section (7) for each flow direction.

Abstract: A shaft coupling apparatus, a rotary fluid damper, and a deployable device are provided herein. In an embodiment, the shaft coupling apparatus includes a chamber having a non-magnetic diaphragm delimiting at least a portion of the chamber. A first shaft is disposed in the chamber and is rotatable about a first axis. A second shaft is disposed outside of the chamber and is rotatable about the first axis. The diaphragm is disposed between the first and second shafts and separates the first and second shafts from direct physical contact. A magnetic coupling mechanism includes a first magnetic coupler attached to the first shaft and a second magnetic coupler attached to the second shaft, with the first and second magnetic couplers separated by the diaphragm. Magnetic coupling forces are generated between the first and second magnetic couplers to transfer rotational energy from the first magnetic coupler to the second magnetic coupler.

Abstract: An oscillating linear compressor includes a cylindrical chassis defining a chamber and comprising a plurality of elongated chassis frame members extending between either end of the chassis. The chassis houses a compression cylinder that receives a linearly-driven piston that is connected to a voice coil. A power distribution assembly couples current to the voice coil providing oscillating magnetic field and comprises a plurality of electrically conductive linear bearings coupled to a power supply that are configured to facilitate substantially frictionless, bi-directional travel of the piston. One or more permanent magnets mounted to the elongated chassis frame members providing a permanent magnetic field with which the voice coil's oscillating magnetic field interacts.

Abstract: A heat dissipation apparatus for effective dissipation of heat comprises an air flow module and a heat sink. The air flow module comprises a casing, a piston module slidably mounted in the casing, an airflow outlet module attached to a first side of the casing, and an electromagnet module attached to a second side of the casing that is opposite to the first side. The airflow outlet module comprises a plurality of airflow outlet grooves. The piston module comprises a magnet. The heat sink is aligned with the plurality of airflow outlet grooves. The electromagnet module is capable of moving the magnet and the piston module back and forth in the casing. The air flow module is capable of blowing air to the heat sink via the plurality of airflow outlet grooves.

Abstract: A rear electromagnet suitable for vibrating pumps and electrical valves. The rear electromagnet for vibrating pump and electrical valves, which is the subject of this invention, has features intended to increase the efficiency of the magnetic system due the particular position of the electromagnet in order to exert a direct attractive force over the ferritic core and to obtain the same performances with less copper, iron and consume less electricity.

Abstract: A linear compressor employing a piezoelectric actuator operating in resonance at a frequency substantially below its natural resonant frequency, which is usually of the order of 10 kHz. Low frequency resonance operation of the actuator, of the order of 100 Hz., is achieved by incorporating the actuator and its housing with the moving compression piston, such that the moving mass is substantially increased, and by reduction of the effective piezoelectric stiffness using hydraulic amplification of the actuator displacement. Both these procedures result in a reduction of the actuator resonant frequency. The hydraulic amplification is achieved by using a hydraulic chamber with different sized pistons, linking the actuator motion with motion of the actuator housing, to which the compressor piston is attached. The high efficiency achieved and the lack of moving parts or the need for lubricating oil makes the compressor ideal for use in high reliability and high purity applications.

Abstract: A permanent magnet linear piston pump comprises a piston body, a cylinder body, a permanent magnet assembly and an electromagnetic coil. The piston body is arranged in a piston cavity by a liquid sealing movable fit mode. An inner magnetic body and an outer magnetic body are disposed on at least one side surface of the cylinder body. An electromagnetic coil is axially and distributively wound around a coil supporting member which is disposed at an outside surface of the cylinder body. The electromagnetic coil is disposed between the inner magnetic body and the outer magnetic body. By the above structure, the pump needs not subject the electromagnetic coil to a sealing treatment, thereby attaining a simple structure, more convenient manufacture, lower costs, a reliable operation and convenient maintenance.

Abstract: A rotary compressor includes a motor, an eccentric shaft and a cylinder installed in a casing. The motor includes a rotor and a stator. The eccentric shaft rotates with the rotor and turns around in the cylinder. The cylinder divides the casing into a high pressure chamber and a low pressure chamber, and the high pressure chamber is disposed between the motor and cylinder, and the low pressure chamber is disposed at the bottom of the cylinder. An isolating element is installed between the cylinder and the casing for isolating the high pressure chamber and the low pressure chamber. The isolating element includes at least one reflowing hole penetrated through the isolating element and interconnected between the high pressure chamber and the low pressure chamber for isolating high and low pressures effectively.

Abstract: An electromagnetic pump including a reciprocating piston in a cylinder; an electromagnetic portion that moves the piston forward; a first biasing member that moves the piston backward; a support member that supports the first biasing member and defines a pump chamber together with the cylinder and the piston; an intake valve that is incorporated into the support member, is connected to an intake port and prohibits hydraulic fluid from moving in reverse; and a discharge valve that is connected to a discharge port and prohibits the hydraulic fluid from moving in reverse. The intake valve includes a ball, an opening portion of the intake port, and a second biasing member that presses the ball against the opening portion from a side opposite to a direction in which the hydraulic fluid moves. In the opening member, an inner peripheral surface that receives the ball is formed in a taper shape.

Abstract: This disclosure relates to medical fluid delivery sets and related systems and methods. In some aspects of the invention, a medical fluid cassette includes a plunger slidably disposed within a recess of a base of the cassette such that a substantially liquid-tight seal is maintained between the plunger and the base as the plunger slides axially within the recess. The plunger and the base cooperate to at least partially define a fluid pump chamber. When the plunger is displaced in a first direction, fluid is forced out of the fluid pump chamber, and when the plunger is displaced in a second direction, fluid is drawn into the fluid pump chamber.

Abstract: A low noise, high efficiency solenoid pump includes a housing containing a hollow electromagnetic coil. Within the coil resides a pump assembly defining a tubular body having a pair of opposed ends which respectively include an inlet or suction port and an outlet or pressure port and within which a plunger or piston resides. The piston is biased in opposite directions by a pair of opposed compression springs. A first compression spring limits and arrests travel of the piston during the suction or return stroke and a second compression spring limits travel of the piston during the pumping stroke and returns the piston after the pumping stroke. The piston includes a first check valve that opens to allow hydraulic fluid into a pumping chamber during the suction stroke and closes during the pumping stroke to cause fluid to be pumped out of the pumping chamber.

Abstract: A discrete, heat-insulating exhaust muffler device (8) and a refrigeration compressor using the exhaust muffler device are provided. The exhaust muffler device (8) includes a metal cavity body defining cavities (9, 10), and intake pipe and exhaust pipe installation holes respectively arranged on the cavities (9, 10). Non-metallic shell bodies (17, 18) are further arranged outside the cavities (9, 10), and the exhaust muffler device (8) is disposed outside cylinder blocks (14) and is separated from the cylinder blocks (14). By disposing a layer of the non-metal shell bodies (17, 18) outside the metal cavity body (9, 10), thermal contact between exhaust gas and gas inside a compressor can be reduced owing to a better heat-insulating effect of the non-metallic material, thereby reducing heat transfer from the metal cavity body (9, 10) to the outside. The gas inside the compressor can have a relatively lower temperature, and the efficiency of the compressor is improved.

Abstract: The linear compressor comprises a shell (10) which affixes a cylinder (20) defining a compression chamber (21) housing a piston (30); a linear electric motor (40) having a fixed part (41) affixed to the shell (10) and a reciprocating movable part (42); an actuating means (50) driven by the movable part (42); an elastic means (60a) coupling the actuating means (50) to the piston (30), so that they are reciprocated in phase opposition. A supporting elastic means (70) connects the actuating means (50) to the shell (10) and presents a radial rigidity for supporting the lateral loads actuating on said movable part (42) and actuating means (50), and for minimizing the axial misalignments between the movable part (42) and the fixed part (41) of the linear electric motor (40), the supporting elastic means (70) presenting a minimum axial rigidity for allowing the displacement of both the piston (30) and the actuating means (50).

Abstract: A cylinder is configured into a bottomed tubular form and includes an inner peripheral wall, an inner bottom wall, an outer peripheral wall and an intake hole and a discharge hole. The inner peripheral wall slidably guides the plunger. The intake hole and the discharge hole communicate between the inner peripheral wall and the outer peripheral wall. A pump housing includes a cylinder receiving hole that includes an inner peripheral wall, into which the cylinder is inserted. A pressurizing chamber is formed by the inner peripheral wall and the inner bottom wall of the cylinder and a distal end outer wall of the plunger.

Abstract: In an air compressor, inner blades of a cooling fan are formed into a centrifugal type, and outer blades are formed into an axial flow type. Exterior air is sucked through a ventilating window by the outer blades, and an air stream (CA1) is generated. A part of the generated air stream flows towards a stator coil, like an air stream (CA2). By a negative pressure generated by the inner blades, the air in the vicinity of the stator coil is sucked to the inner blades, like an air stream (CA3). The sucked air flows out from a motor-side opening towards a non-motor-side opening by a negative pressure generated by the outer blades, is sucked to the outer blades like an air stream (CA4) and flows out together with the air stream (CA1).

Abstract: An air compressor device includes a cylinder housing and a supporting plate, a piston engaged in the cylinder housing and having a piston rod, a gear and an eccentric member attached to the supporting plate with a shaft, the eccentric member includes an eccentric pin coupled to the piston rod, and a motor includes a protrusion engaged into an orifice of the supporting plate and includes a spindle extended out of the protrusion and extended through the orifice of the supporting plate, and includes a pinion attached to the spindle and engaged with the gear, and the pinion includes an outer diameter (D) greater than an outer diameter (d) of the protrusion of the motor.

Abstract: The invention relates to a device for processing an edible product in the form of a viscous to pasty mass, in particular, an edible product based on a fatty mass, such as chocolate, or based on water, such as ice cream. Said device comprises dosing units (D1, D2) for the dosed supply of a specific volume of the mass to a bearing surface. Said dosing units (D1, D2) comprise, respectively, a dosing piston (4) which is mounted in a piston chamber, whereby the dosing piston (4) moves at least in a rotational manner about the piston axis thereof (A1). A first plurality of dosing units (D1) are arranged on a first plane, and a second plurality of dosing units (D2) are arranged on a second plane. The dosing piston (4) of the dosing units (D1), which are arranged on the first plane (D1), are rotationally driven by means of a first drive element (7; 16), and the dosing piston (4) of the dosing units (D2), which are arranged on the second plane, are rotationally driven by means of a second drive element (8; 16).

Abstract: A beamless mechanic-reversing long stroke pumping unit is provided for petroleum production in diverse types of oil fields. Its mechanic-reversing system consists of differentials, brakes, etc. With two differentials assembled together, taper gears inside them perform revolution and rotation, enabling the pumping unit to achieve direction change and speed change mechanically. The stroke length of the pumping unit can reach 8 meters or longer, and the adjustment process is more convenient than most, by merely tuning the position of the proximity switches. Abrasion of the chains typically caused due to resetting of a motor frequently during operation, is eliminated in this pumping unit. The pumping unit has more reliable operation performance, more convenient maintenance, lower costs, better energy saving effects, and can be applied in land oil fields, offshore oil fields, oil wells with low permeability, etc.

Abstract: A sealed compressor comprises a sealed container (101) which accommodates an electric component (105) and a compression component (106); wherein the compression component (106) includes a shaft (110) including a main shaft section (111) and an eccentric shaft section (112), a cylinder block (114), a piston (126), and a main bearing unit (120) mounted to the cylinder block (114) and supporting the main shaft section (112) such that the main shaft section (112) is rotatable, a thrust ball bearing (132) mounted to a thrust surface (130) of the main bearing unit (120); and the thrust ball bearing (132) includes a plurality of balls (134) held in a cage (133), an upper race (135) having main surfaces one of which is in contact with upper portions of the balls (134); and a lower race (136) having main surfaces one of which is in contact with lower portions of the balls (134) and; a restricting means for restricting a displacement of the upper race (135) with respect to the shaft (110).

Abstract: An apparatus for delivering a fluid includes a housing, an inlet in the housing for receiving the fluid, and an outlet in the housing for discharging the fluid. A piston channel is provided within the housing through which the fluid flows from the inlet to the outlet. An actuator is positioned within the housing and is moveable between a retracted position and a forward position, the actuator defining a piston chamber for storing fluid received through the inlet when the actuator is in the retracted position and for driving the fluid stored in the piston chamber toward the outlet when the actuator transitions from the retracted position to the forward position. The actuator includes an armature and a piston coupled to the armature and moveable within the piston channel. The piston channel wall is provided with a groove for conducting fluid from the inlet to the outlet.

Abstract: A coupling system for receiving a push rod includes a housing defining an internal channel having a sloped wall, and a piston received within the internal channel. The piston includes at least one flexible member arranged within the channel to be acted upon by the sloped wall to engage the push rod. The only external force required to couple the push rod is an axial force on the piston in a direction. The only external force required to de-couple the push rod is an axial force on the piston in an opposite direction.

Abstract: A device for simulating blood flow including an anatomical unit and a waveform generator for generating waveforms. The waveform generator includes a pump capable of pumping a fluid through at least one fluid line and thereby transmitting the waveform from the waveform generator through the fluid line. The waveform generator further includes a bifurcation point capable of splitting the fluid line into additional fluid lines, where the fluid lines include a main line and a parallel line. Additionally, the waveform generator includes valves capable of at least partially occluding fluid flow. The device further includes a reservoir capable of housing the fluid, where the waveforms enter and exit the anatomical unit and the waveform generator through the fluid lines simulating blood flow.

Abstract: A linear compressor is provided. The linear compressor may include a shell having a refrigerant inlet, a cylinder provided inside the shell, a piston that reciprocates inside the cylinder to compress a refrigerant, a motor assembly that provides a drive force to the piston, and a magnet assembly that delivers the drive force to the piston. The magnet assembly may include a magnet frame having a cylindrical shape. A permanent magnet may be installed in or on the magnet frame. A coupling plate may be coupled to a side of the magnet frame and may include a flange coupled to an end portion of the permanent magnet.

Abstract: A linear compressor is provided that may include a shell provided with a refrigerant inlet; a cylinder provided inside of the shell to form a compression space; a piston that reciprocates inside of the cylinder to compress a refrigerant in the compression space; and a motor assembly that provides a drive force to the piston and provided with a permanent magnet. The piston may include a piston body having a cylindrical outer circumferential surface and a surface-treated area, which may be processed with a material having a predetermined hardness value, and a valve support provided at an end of the piston body and having a suctioning hole be in communication with the compression space. The valve support may form a first non-surface-treated area, which is not surface-treated.

Abstract: A pump system configured to deliver drilling fluid in at least one of a driving well and a drilling well includes a pump unit, a rotary drive device configured to drive the pump unit, and a gearbox comprising a driving gear and an driven gear. The rotary drive device is operatively connected to the pump unit by the gearbox.

Abstract: A sealed compressor (100) comprises an electric component (110), a compression component (112), and a sealed container (102), the compression component includes a shaft (118), a cylinder block (124), a piston (130), and a ball bearing (176), the ball bearing includes a cage (168), a plurality of rolling elements (166); a first race (164), a second race (170), and a support member (172), and when a mass of a shaft assembly (118a) including the rotor (116) and the shaft is M, a spring constant of the support member is K, and a maximum rotational frequency of the shaft assembly is F, a relationship of F<1/4?)*(K/M)?0.5 is satisfied.

Abstract: A linear compressor is provided that includes a cylinder having a compression space for refrigerant therein, a piston that linearly reciprocates inside the cylinder in an axis direction to compress the refrigerant, and a frame having a mounting hole so that one end of the cylinder may be mounted thereon and a deformation prevention portion in some section around the mounting hole brought into contact with the one end of the cylinder. Even if a size of the cylinder is increased and a size of the frame limited, the frame is provided with enough strength to support the cylinder, thereby reducing fastening deformations and improving operation reliability.

Abstract: Restrictors (16,17) for aerostatic bearings capable of ensuring a constant flow, regardless of their size and dimensional tolerance, such that the gas flow is adjusted by deforming their internal section. A process for the production of restrictors (16,17) for aerostatic bearings with respect to ensuring the gas flow values desired is also provided.

Abstract: A pump includes a drive assembly having a drive shaft rotatable about a drive axis, and an eccentric coupled to the drive shaft for rotation therewith. The eccentric includes a shaft portion defining an eccentric axis that is offset from the drive axis. The shaft portion includes a shaft end defining a first alignment feature. A piston is rotatably coupled to the shaft portion and defines a second alignment feature. A cylinder reciprocatingly receives the piston. Positioning the first alignment feature in a predetermined orientation with respect to the second alignment feature locates the piston in one of a top-dead-center position and a bottom-dead-center position with respect to the cylinder.

Abstract: A pump for use in low-profile applications comprises a barrel for holding fluid; and a piston that converts a rotational driving force into a longitudinal driving motion within the barrel. The pump provides space saving advantages by reducing the need for external equipment and mechanisms around the pump for providing actuation or moving the actuating mechanism.

Abstract: A hermetic compressor includes a closed vessel for storing lubricating oil, an electric-driving element, and a compressing element driven by the electric-driving element. The compressing element includes a cylinder block forming a compression chamber, a piton that reciprocates inside the compression chamber, and an oiling device for supplying the lubricating oil to an outer circumference of the piston. A first oil groove is concavely formed on the outer circumference of the piston, and a second oil groove is concavely formed on a side opposite to the compression chamber relative to the first oil groove. The second oil groove has a spatial volume same or greater than that of the first oil groove. An expanded clearance portion is provided such that a clearance between the piston and the cylindrical hole portion broadens from a top dead point to a bottom dead point.

Abstract: A sealed compressor (100) of the present invention comprises an electric component (111), a compression component (117), and a sealed container (101), the compression component includes a shaft (119), a cylinder block (129), a piston (133), and a crank weight (126), a rotor (115) of the electric component has a cylindrical shape, contains a cylindrical space therein, and includes an upper section (116) in which a lower portion of a bearing (131) of a cylinder block is fitted into the cylindrical space, a lower section (115e) to which a lower portion of the main shaft inserted into the through-hole of the bearing and inserted into the cylindrical space is fixedly fitted, and a balance weight (170, 270) placed on an opposite side of the crank weight with respect to the piston.

Abstract: A portable cooling unit comprising a magnetic spiral vapor pump that utilizes a magnetic pulse between two electromagnets and spiral drive slots to pull a piston back-and-forth 180-degrees and thereby alternately align compression slots on the piston's opposing ends with vapor suction ports and highly-compressed vapor discharge ports. Electromagnet use lowers the amount of battery power required for piston rotation. A condenser in a mounting pan under the pump achieves refrigerant condensation, while a fan blowing air through an evaporator positioned within a flexible hose causes cool air discharge through openings in the hose's terminal end fitting. The condenser utilizes surplus condensation from the evaporator to aid its vapor-to-liquid conversion, and batteries only provide power for the magnetic control module and fan.

Abstract: A modular paint pump for a paint roller having a battery operated pump in a housing supporting a paint can. A wetted parts subassembly is manually removable for cleaning or service without the use of tools. The wetted parts subassembly may include inlet and outlet check valves and a piston, a seal and a pump cylinder. A cover having a siphon is secured to the paint can by an elastic cord hooked to the housing.

Abstract: A refrigeration compressor includes a housing having a wall, a suction gases inlet and a compressed gases outlet. A linear compressor is supported for operation within the housing. A hollow tubular body extends from the compressed gases outlet and is adapted for attachment to a refrigerant circuit. A compressed gases discharge conduit extends from the linear compressor, and to the hollow tubular body to form a seal at a point of direct contact therewith.

Abstract: A precision pump system having a motor driver for accurately and repeatedly delivering process fluid, (e.g., photo chemicals) using a pumping fluid with minimal process fluid loss to a fabrication process and whereby the motor driver can be easily and quickly replaced without interrupting the fluid flow path. This is accomplished with the use of a process fluid reservoir and a pumping fluid reservoir that are associated with the pump, either integrated with the pump or closely adjacent. In addition, this precision pump system can be remotely monitored, viewed and controlled over the Internet. In addition, trapped process fluid within a downstream filtering block can be recirculated to the process fluid reservoir when trapped gas in the filter is removed. Furthermore, a nitrogen gas source is connected to the process fluid reservoir via a valve in case a need to insert a gas is required.

Abstract: The invention relates to a domestic appliance, such as a steam iron or a coffee making apparatus. Such appliances comprising a housing, a water reservoir, an actuator, for example, plunger pump and a boiler for providing hot water or steam for an appliance. An input of the plunger pump is connected to the water reservoir, an output of the plunger pump is connected to an inlet of the boiler. In operation, the plunger pump is reciprocating at the mains frequency. The operating plunger pumps introduces vibrations which are transmitted to the housing and radiated by the housing to the environment which cause sounds and noise which are not user friendly.

Abstract: A pump includes a substantially tubular housing having an inlet end and an outlet end and defining a central axis and a chamber within the body portion, and a movable valve assembly slidably received within the housing for movement in the direction of the central axis. The pump also includes a handle assembly slidably disposed at least partially around an outer circumference of the housing for movement in the direction of the central axis, the handle assembly being substantially annular ring-shaped, and the handle assembly including a grip engageable by a hand of an operator for manually sliding the handle assembly, the handle assembly being coupled to the movable valve assembly, manual movement of the handle assembly along the central axis causing corresponding movement on the movable valve assembly along the central axis.

Abstract: According to the invention, an air compressor includes: one pair of air tanks arranged parallel to each other by being separated from each other in a constant interval, for storing thereinto compressed air; a compressing unit that compresses air sucked from an external space so as to supply the compressed air to the air tanks; and a motor coupled to the compressing unit so as to drive the compressing unit, while the motor and the compressing unit are arranged above the one pair of air tanks; wherein: a cooling fan that generates cooling wind is provided on one end of a rotation shaft of the motor; and a control circuit unit that drives the motor is arranged above the one pair of air tanks and at a position which is overlapped with an axial direction projection area of the cooling fan.

Abstract: Disclosed is an oil-pumping machine, which is characterized in that it is composed of a secondary sheave (5) of a wheel-cylinder type driven by an electric motor.

Abstract: A hermetic compressor includes a closed vessel for storing lubricating oil, an electric-driving element, and a compressing element driven by the electric-driving element. The compressing element includes a cylinder block forming a compression chamber, a piton that reciprocates inside the compression chamber, and an oiling device for supplying the lubricating oil to an outer circumference of the piston. A first oil groove is concavely formed on the outer circumference of the piston, and a second oil groove is concavely formed on a side opposite to the compression chamber relative to the first oil groove. The second oil groove has a spatial volume same or greater than that of the first oil groove. An expanded clearance portion is provided such that a clearance between the piston and the cylindrical hole portion broadens from a top dead point to a bottom dead point.