Abstract: A rotary compressor is disclosed which is equipped with a bypass hole for bypassing a fluid under compression to the intake side and the capacity thereof is controlled through opening and closing of the bypass hole with a piston which is operated via a control valve, whereby the bypass hole is opened at or in the vicinity of a discharge port of the compressor and the capacity of the compressor is made to be controllable in the range of one hundred to substantially zero percent. By the application of such a rotary compressor to the compressor for an air conditioner, capacity control in the range of about zero to 100% of discharge quantity can be accomplished so that it becomes possible to obtain cooling capability which is in response to the heat load.

Abstract: An oilless double rotor, rotary gas compressor with second stage inputs for precompressed gas is described. A compression rotor having at least three lobes which match in intersection to cavities in a counterrotating valving rotor providing an extended sealing surface. The lobes further provide an extended, near-contact surface with the housing with adjacent lobes defining successive compression chambers. Second stage ports are also provided for input of precompressed gas for use with energy recovery systems. A discharge equalization passage is provided in association with a discharge port for efficient gas exhaust.

Abstract: A vane-type rotary hydraulic machine that comprises a housing, a rotor mounted within the housing and having a plurality of radially extending peripheral slots, and a plurality of vanes individually slidably mounted in the rotor slots. A cam ring within the housing surrounds the rotor and has a radially inwardly directed surface forming a track for sliding engagement with the vanes. Symmetrical diametrically opposed fluid pressure cavities are formed between the cam ring surface and the rotor, and fluid inlet and outlet passages in the housing are coupled to the fluid pressure cavities.

Abstract: A portable, high-pressure, power washing system is described which includes an electric motor driven gear pump where the electric motor is effectively water cooled by virtue of being contained in a thermally conductive housing surrounded by an insulating water jacket through which the water being pumped is made to flow before reaching the pump's inlet port. The pump is driven through a gear reduction mechanism such that a relatively inexpensive, single-phase, series AC (universal) motor normally operating at a high rpm can be employed. By proper dimensioning of the pump chamber relative to the drive and idler gears and by providing a flow divider at the pump chamber's discharge orifice, high pumping efficiency is obtained. Completing the assembly is a discharge wand for directing the high pressure water at the surface to be cleaned and for controlling the on/off state of the pump's drive motor.

Abstract: A discharge valve assembly, comprising a reed valve and an overlying valve retainer, is cantilever mounted on the axially outer surfaces of cast iron main and outboard bearings of a rotary vane compressor. Each valve assembly includes a round mounting end having an off-center hole extending through the valve and retainer, and an opposite end associated with opening and closing a discharge port extending through the bearing. The mounting end fits within a counterbore on the outer bearing surface and is retained therein by means of a rivet or the like through the off-center hole. The valve assembly is prevented from rotating about the rivet by the sidewall of the counterbore to maintain proper orientation of the valve and retainer so that they precisely cover the discharge port.

Abstract: A split-discharge balanced dual-lobe vane-type rotary hydraulic machine that comprises a housing, a rotor mounted within the housing and having a plurality of radially extending peripheral slots, and a plurality of vanes individually slidably mounted in the rotor slots. A cam ring within the housing surrounds the rotor and has a radially inwardly directed surface forming a track for sliding engagement with the vane. Opposed symmetrical pressure cavities are formed between the cam ring surface and the rotor, and fluid inlet and outlet passages in the housing are coupled to the fluid pressure cavities. The fluid inlet and outlet passages include a fluid inlet port opening into each cavity adjacent to one circumferential edge thereof, a first fluid outlet port opening into each cavity adjacent to the opposing circumferential edge thereof, and a second fluid outlet port opening into each cavity at a position circumferentially between the inlet and first outlet ports.

Abstract: A rotary compressor of variable displacement type comprises a cylinder, a rotor accommodated in the cylinder in an eccentric relationship therewith, at least one vane incorporated in the rotor through an outer periphery of the latter and movable relative to the rotor reciprocatively in a longitudinal direction of the vane, and two side plates closing the cylinder at both axial ends of the latter. A suction port is formed in at least one of the side plates, while an opening portion is formed in a rear side portion of the vane as viewed in a direction of rotation of the rotor and being opened at a surface of the vane making sliding contact with the rotor. This opening portion is repeatedly communicated with and interrupted from a working space in the compressor according to the reciprocative movement of the vane relative to the rotor.

Abstract: Discharge system for rotary rolling piston compressor of the type that comprises a cylinder housing a rolling annular piston and a sliding vane which defines a suction and discharge volumes in the space between the piston and the cylinder and the inner faces of main and sub bearing plates, one of the plates having a discharge valve in communication with the discharge volume and being provided with a suction orifice. A gas outlet means communicates with the interior of the cylinder and has at least two gas intake positions one arranged in the extreme final region of the discharge volume and the other arranged radially set back and angularly advanced relative to the first.

Abstract: A method of scavenging air and oil from a component (3) of an aircraft for returning the oil to a reservoir (4) for recirculation to the component involves the use of a gear pump (1) for scavenging the oil and gas. The gear pump centrifugally separates oil from the air and returns only the separated oil to the reservoir through outlets located upstream of the mesh zone of the gears while the air is discarded whereby lower discharge pressure of the gear pump is attained and there is no longer a need for a separate air-oil separator.

Abstract: A multi-section Roots vacuum pump of the reverse-flow cooling type having a plurality of pump sections each having rotors fixed to two common shafts. The pump includes a housing in each of the pump sections having an inlet and an outlet for a gas to be pumped and enclosing the rotors, a peripheral gas passages arranged around the housing, and a peripheral coolant water passages arraged around the peripheral gas passages. The gas flowing through the inlet into the housing and delivered through the outlet is supplied to the peripheral gas passages to be cooled there, and at least a portion of the cooled gas is returned into the housing. The remaining portions of the gas which are not returned into the housing in the pump sections except for the last pump section are supplied to the inlet of the next pump section through the peripheral gas passage.

Abstract: An apparatus for quantatively extruding food material is provided. In this apparatus the material is introduced into a space formed between the periphery of a drum and the side wall of a housing. The space is divided into sections defined by flanges, and thus the material is divided into portions and introduced into each section. The drum has an inner chamber between its inner wall and the periphery of a cam. Blades are inserted into slits in the drum periphery, and adjacent pairs of blades form compartments in the sections in the outside of the drum as well as in the inner chamber.The apparatus has a plurality of exit ports communicating with the respective sections. Since the dimensions of the compartments in each section decrease toward the exit ports, while the dimensions of the compartment in the inner chamber increased, the pressure in the outer compartments becomes higher than that of the inner chamber.

Abstract: A gerotor pump set passages 32 extending parallel to the axis of rotation through the female lobed annulus, and similar passages through the male lobed rotor. These passages enable flow from the fluid inlet to pass into the working chamber such as 43 either directly at the inlet end, or after flow through those passages and through the transfer passage 43 at the opposite axial end to the inlet, without requiring a transfer passage externally of the annulus. the result is better axial filling of the working chambers, in a particularly compact design.

Abstract: A rotary gas compressor suitable for heavy duty continuous or intermittent operation with automatic inlet and outlet pressure control valves to reduce power consumption and increase volumetric efficiency. Articulated volume displacers further increase volumetric efficiency, extend life of wearing components and permit infinitely variable capacity control from 0 to 100%. High loads and high speeds are possible due to intrinsic radial load balancing. Additional provisions include replaceable cylinder liners.

Abstract: A discharge valve assembly, comprising a reed valve and an overlying valve retainer, is cantilever mounted on the axially outer surfaces of cast iron main and outboard bearings of a rotary vane compressor. Each valve assembly includes a round mounting end having an off-center hole extending through the valve and retainer, and an opposite end associated with opening and closing a discharge port extending through the bearing. The mounting end fits within a counterbore on the outer bearing surface and is retained therein by means of a rivet or the like through the off-center hole. The valve assembly is prevented from rotating about the rivet by the sidewall of the counterbore to maintain proper orientation of the valve and retainer so that they precisely cover the discharge port.

Abstract: A sliding-vane rotary compressor cylinder having a row of discharge holes arranged in an axial direction of the cylinder, and a corresponding number of discharge valves normally closing the respective discharge holes. The opening of two endmost discharge valves is limited by a first valve-opening limiting device to a first value. The opening of the remaining discharge valves is limited by a second valve-opening limiting device to a predetermined value which is larger than the first value. With this construction, the a rotor rotatably received in the cylinder is stably held in position against axial displacement or oscillation.

Abstract: A sliding-vane rotary compressor includes a cylinder having a plurality of discharge holes aligned in an axial direction of the cylinder, and a corresponding number of discharge valves normally closing the respective discharge holes. Respective openings of the discharge valves are limited in such a manner as to increase progressively in a direction from a front side to a rear side of the cylinder to thereby produce a pressure difference between the front and rear sides of the cylinder. With this pressure difference, the cylinder is normally urged toward one side and hence is unlikely to oscillate in the axial direction. The compressor thus constructed is capable of operating silently without generating an unpleasant oscillating noise.

Abstract: A rotary fluid machine includes two intermeshing rotors rotatably mounted in a double-cylinder bore portion of a casing, each rotor having two lobe portions disposed on two opposite ends of a long coordinate axis of the rotor and having a waist portion confined by two shallow recess portions formed on two opposite sides of a short coordinate axis of the rotor so that one rotor can be smoothly rotatably engageable with the other rotor in a single-point contact for a smooth running of the two rotors. For a buffer of a higher output fluid pressure, a balancing chamber is formed between the bore portion and a fluid outlet so that a fluid suddenly increased with fluid pressure may be backflowed into the bore portion through a plurality of holes formed in a partition plate between the chamber and the bore portion for preventing water or air hammer when handling high-pressure fluid.

Abstract: A rotary hydraulic vane pump includes a rotor mounted within a housing, with a plurality of vanes individually slidably disposed in corresponding slots in the rotor periphery. A cam ring surrounds the rotor within the housing and has a radially inwardly facing vane track defining as least one arcuate fuel pressure cavity between the rotor and the cam ring. A fuel inlet in the housing includes a primary inlet port opening into the cavity at the leading circumferential edge of the cavity with respect to the direction of rotation of the rotor within the housing. A pump outlet includes an outlet port that opens into the cavity adjacent to the trailing circumferential edge of the cavity. A secondary inlet port opens into the cavity circumferentially between the primary inlet port and the outlet port, and is directly connected to the pump outlet port such that fluid at outlet pressure is available at the secondary inlet port.

Abstract: A rotary compressor includes a top clearance volume formed between a cylinder chamber and at least one delivery valve. Another top clearance volume, in communication with the cylinder chamber, produces a reverse flow of compressed fluid which generates pulsations adapted to offset a high frequency component of pulsations generated in the cylinder chamber by compressed fluid reversely flowing from the first top clearance volume to the cylinder chamber. Thereby the high frequency component of pulsations generated in the cylinder chamber is eliminated, and a low-noise rotary compressor is provided.

Abstract: A fuel pumping apparatus includes a high pressure pump and a low pressure pump contained in a housing and driven by a drive shaft which is coupled to a rotary part of an internal combustion engine. The low pressure pump is a vane pump having a rotor in which is formed a plurality of outwardly extending slots which accommodate outwardly spring loaded vanes. The edges of the vanes engage an eccentrically disposed surface formed on a stator. The pump has end plates and inlet and outlet ports communicating with the space defined between said surface and the outer surface of the rotor. The outer edges of each vane are formed with grooves which extend along the edges and the grooves communicate by way of passages with the inner ends of the respective slots.

Abstract: In a displacement machine for compressible media on the spiral principle, the rotor disk (2) terminates radially flush with the displacement strips (3, 3'). So that the disk (2) can pass through the housing, in the inlet region (12, 12') of the machine the inner web (18, 18') of one housing half (7) is lowered by the amount of the disk thickness. To prevent leaks during the operation of the machine, the transition (19, 19') between the raised web (17, 17') and the lowered web (18, 18') is made circular. The rounding cooperates with a clearance (20, 20') in the form of an arc of a circle in the disk (2). Machines of this type are especially suitable for the supercharging of internal-combustion engines.

Abstract: A high ratio positive displacement recirculating rotary compressor is disclosed. The compressor includes an integral heat exchanger and recirculation conduits for returning cooled, high pressure discharge gas to the compressor housing to reducing heating of the compressor and enable higher pressure ratios to be sustained. The compressor features a recirculation system which results in continuous and uninterrupted flow of recirculation gas to the compressor with no direct leakage to either the discharge port or the intake port of the compressor, resulting in a capability of higher sustained pressure ratios without overheating of the compressor.

Abstract: A high side hermetic scroll compressor passes the discharge gas along the interior of the shell and is thereby cooled prior to being subjected to a centrifugal separation to remove the oil before being discharged from the compressor. The separated oil is returned to the sump via a fluid path isolated from the discharge gas.

Abstract: A transmission pump has a cylindrical body sized to fit in a bore in the transmission housing. Inlets and outlets are circumferentially spaced on the cylindrical body. Convoluted ring type seals are arranged on the outer surface of the body in order to allow the inlets and outlets to have profiles that are closer to or even axially overlap, allowing for greater size within a limited axial body length.

Abstract: Rotary vane pump with ballast ports which introduce air into the swept cells before they reach the pump outlet port. To prevent overheating at very high vacuums, the ballast ports are arranged to provide a ratio of ballast air flow to pump displacement, at a standard working vacuum of 20 inches Hg gauge, of at least 35%. This permits operating at 25 inches Hg gauge without the need for a cooling fan.

Abstract: A device for controlling a rotating-piston machine in which inner and outer rotors rotate at unequal speeds and profiled teeth thereon form gaps to define working chambers which move, with change of volume, from an inlet region to an outlet region of the machine. The device comprises a body having a feed channel for a working fluid, a plurality of supply channels which open into the inlet region and two rotary slide valves for controlling communication between the feed channel and the supply channels to fill the working chambers during development of suction therein upon rotation of the rotors. The body has two round cutouts each containing a respective rotary slide valve. One slide valve controls supply of fluid at the beginning of development of suction in each working chamber whereas the other slide valve controls supply fluid at the end of development of suction in each working chamber. Each cut-out is connected to the feed channel and to respective associated pluralities of supply channels.

Abstract: A scroll compressor is provided with a two groups of commmunication ports formed in and extending through an end plate of a stationary scroll member. Each group includes two or more communication ports. A lead valve is associated with each of the two groups of communication ports and is operable by a pressure differential in between an associated compression chamber and the discharge chamber to communicate the communication ports of the group to the discharge chamber to prevent the occurrence of over-compression in the compression chamber.

Abstract: In a scroll compressor for compressing gas by the relative orbital movement between first and second scrolls which combined with each other to form a compression chamber therebetween and a super-charging tube is connected to an intake port formed in the first scroll. The volume of the gas to be compressed is controlled by changing the length of the super-discharging tube.

Abstract: Described herein is a method for operating an oil-free screw compressor and an oil-free screw compressor construction, the method including the step of feeding a gas of a temperature Ta to a discharge space in the vicinity of the discharge port of the compressor, the temperature Ta satisfying the relationshipTa.ltoreq.Tl/kwherein Ta is the temperature (.degree.K.) of said feed gas; Tl is the temperature (.degree.K.) of the compressed gas before feeding; and k is a polytropic index number.

Abstract: A screw vacuum pump which includes a pair of screw rotors meshed with each other. The vacuum pump includes an oilless screw vacuum pump suitable for application to industries where air containing foreign matter is detrimental to the products to be produced and for application to the food industry where odorous air must be avoided.

Abstract: An apparatus for quantitatively extruding food material is provided. In this apparatus the material is introduced into the space formed between the periphery of a drum and the side wall of a housing. The drum has an inner chamber between its inner wall and the periphery of a cam. A pair of blades is inserted into slits formed on the drum form a compartment in the outside of the drum and a compartment in the inner chamber.Since the dimensions of the space in the compartment outside of the drum decrease towards the exit port, while the space of the inner chamber increases, the pressure in the space becomes much higher than that of the inner chamber. Thus the air in the material is drawn out of the outer compartment into the inner chamber via a path formed between the recess on the trailing surface of the blade and the wall of the slit. As a result material of a uniform quantity and density, and that has no air entrainment, is extruded from the exit port.

Abstract: The invention relates to a compressor (2) which is encapsulated in a housing (4) and which can be rotated about the axis (16) of its crankshaft (8) while maintaining the oil lubrication of the moving parts of the compressor. The interior (14) of the housing (4), in which an oil sump (18) is located, is connected flow-wise to the compressor (2). According to the invention, the interior (14) is connected to two gas lines (24, 26) which lead to a common manifold (32) via at least one shutoff valve (28, 30). The connecting openings (25, 27) of the two gas lines (24, 26) leading into the interior (14) are arranged opposite to one another in the vicinity of the axis (16) of the crankshaft (8). By these measures, the compressor can be inclined relative to the horizontal over a wide angular range without lubricating oil flow into the gas loop.

Abstract: This invention relates to a self-contained, portable apparatus for admixing a plurality of liquids. The liquids, generally a diluent (such as water or an organic solvent), together with dilutable liquid chemical concentrates such as pesticides, fertilizers, and the like, are automatically proportioned and blended together to produce a resultant mixture, with controlled dispensing of the resultant mixture. The apparatus, which may be hand carried, is preferably powered by a battery source that is operatively connected to a positive-displacement pump. Such positive-displacement pump draws the liquids into the pump, utilizing the pump vacuum force, mixes the liquids in the pump chamber or housing, and thereafter discharges the resultant mixture from the apparatus, utilizing a suitable dispensing device.

Abstract: A multi-section Roots vacuum pump of the reverse flow cooling type with internal flow division arrangement includes a sequence of pump sections, casings for the pump sections including housings for accommodating pairs of rotor therein, inlet passages and outlet passages connected to the casing for pump sections, upper peripheral gas passages connected to the inlet passage formed around an upper portion of the housing, lower peripheral gas passages connected to a supply inlet of reverse flow cooling gas formed around a lower portion of the housing, partition walls between the upper and lower peripheral gas passages, and inter-section walls for separating adjacent pump sections.

Abstract: An air conditioner includes a scroll-type refrigerant compressor driven at a speed variable in accordance with the thermal load on the air conditioner. The compressor has stationary and orbiting scroll members assembled together to define compression chambers in which a refrigerant gas is compressed and finally discharged into a discharger chamber through a discharge port formed in the center of the end plate of the stationary scroll member. At least one bypass port and an associated check valve are provided in and on the end plate of the stationary scroll member at such a position that the check valve opens to allow the gas to be directly discharged from an associated compression chamber into the discharge chamber when the compressor is operated under such a condition that the ratio of the operation pressure ratio to the design pressure ratio of the compressor falls within a range between 0.5 and 0.75.

Abstract: A screw compressor including a scavenging port, which is separate from a discharge port, located on or in a vicinity of a discharge-side end face of the working space of the casing, for scavenging gas therethrough from a compression chamber near to a completion of a suction stroke. Gas of high temperature leaking from a compression chamber on high-pressure side into a compression chamber on a low-pressure side (in the suction stroke) can be scavenged from the compressor to outside, thereby avoiding a reduction in suction volume efficiency, an increase in consumption of power, and a rise in temperature of gas to be compressed which might otherwise be caused by the gas of high temperature leaking into the compression chambers during a suction stroke.

Abstract: An improved rotory positive displacement blower (10) of the Roots-type with reduced airborne noise and superior efficiency. The blower includes a housing (12) defining generally cylindrical chambers (32, 34) having cylindrical wall surfaces (20a, 20b) and containing meshed lobed rotors (14, 16) having the lobes (14a, 14b, 14c, 16a, 16b, 16c) thereon formed with an end-to-end helical twist according to the relation 360.degree./2n, where n equals the number of lobes per rotor. Preferably, n equals three. The blower housing (12) also defines inlet and outlet ports (36, 38) and the intersections of wall surfaces (20a, 20b) define a cusp (20d) associated with the inlet port (36) and a cusp (20e) associated with outlet port (38). The inlet and outlet port openings are skewed in opposite directions to increase the time the top lands of the lobes are in sealing relation with cylindrical walls (20a, 20b) of chambers ( 32, 34).

Abstract: The pump includes a stator and a rotor which describe an upper annular chamber having a filling mouth and a delivery mouth and a lower annular chamber in which is housed an annular cam to drive the pump blades housed in a vertically sliding manner in respective radial passages of the rotor. Into the lower chamber essentially in a position diametrically opposed to the filling mouth there opens an exhaust mouth which communicates with the upper chamber through an ample passage and with the zone of the lower chamber underlying the filling mouth through a narrow passage.

Abstract: A screw compressor lubrication channel for lubrication of a rotor bearing on the compressor's low pressure side, which is supplied with refrigerant droplets containing oil accompanying the inlet gas. This kind of lubrication is usually carried out by permitting a limited amount of gas and oil to flow from the high pressure side to the low pressure side via the bearings located on the low pressure side, and further to the inlet. By this working mode compressor capacity as well as compression work deposited is lost. This is avoided when the compressor according to the present invention is provided with a special, smaller inlet channel (7), which via the rotor bearing (3) opens out in a specific inlet port (8) located at an expanding rotor thread presenting a lower pressure than the inlet (6) pressure of the compressor.

Abstract: A variable capacity vane compressor comprises additional refrigerant inlet ports formed in one of front and rear side blocks of a cylinder accommodating a rotor, and communicating a suction chamber with a compression chamber on a suction stroke, and a control element received in a recess formed in an end face of the above one side block facing the rotor, for rotation to vary the opening angle of the additional inlet ports to thereby control the compression commencing timing of compression medium. At least one spacer is interposed between the control element and at least one of the above one side block and the rotor, for maintaining a predetermined minimum clearance therebetween.

Abstract: A rotary compressor includes a compression section disposed in a case. The compression section has a cylinder and first and second bearings fixed on both sides of the cylinder to define a compression chamber together with the cylinder. A first discharge mechanism for discharging a fluid compressed in the compression chamber into the outside of the chamber is provided at the first bearing. A second discharge mechanism for discharging a fluid compressed in the compression chamber into the outside of the chamber is provided at the second bearing. The first mechanism has a first discharge port formed in the first bearing and a first discharge valve for opening and closing the first port. The second mechanism has a second discharge port formed in the second bearing and a second discharge valve for opening and closing the second port with a different frequency from that of the first valve.

Abstract: A refrigerant gas injection system for a refrigeration cycle of the type having a screw compressor provided with a slide valve for controlling the compression capacity of the screw compressor, an economizer disposed in a passage for refrigerant liquid and adapted for subcooling the refrigerant liquid by the refrigerant of a reduced pressure, and a refrigerant gas injection line through which the refrigerant gas generated in the economizer is injected into the compression chamber of the screw compressor in its compression phase. The refrigerant gas injection system has a gas injection controller adapted to enable the injection of the refrigerant gas when the screw compressor is operating at full (100%) capacity or load level and to prevent the injection of the refrigerant gas when the screw compressor is operating in unloaded state.

Abstract: This is a compressor apparatus having a central cavity, a fluid inlet and a fluid outlet coupled to the cavity, a pair of impellers having hollow interiors positioned in the cavity between the inlet and the outlet, each impeller having a plurality of exernal teeth engaging and intermeshing with the teeth on the other impeller and adapted for compressing a fluid, introduced into the cavity, means for rotating the impellers to draw the fluid out of the interior of the impellers and compress the fluid in the cavity and to force the compressed fluid out of the cavity through the outlet, each impeller having a fluid inlet on one end coupling the inlet of the cavity to the hollow interior of the impeller, each impeller further having a plurality of slots between each of the teeth on the impeller, said slots connecting the hollow interior of the impeller to the cavity through which fluid, introduced into the interior of the impeller, can exit the impeller and pass into the cavity, and a gate positioned in the hollow

Abstract: A rotary vane-type gas compressor for use in car coolers and the like has a plurality of intake ports for each compression working chamber located at positions shifted from one another in the revolving direction of a rotor. At least one intake port which is located at the most forward position in the revolving direction of the rotor has a throttle valve which is controlled in response to the flow rate of suctioned gas, and the opening degree of the throttle valve is changed as the revolution speed of the rotor increases and creates a higher flow rate of suctioned gas. This reduces the effective compression working chamber volume, i.e., the volume which results when one vane has passed the position of the corresponding intake port to enclose gas in the compression working chamber. By such a construction, it is possible to restrain a substantial increase in both the amount of compressed gas to be discharged and the air-cooling capacity, even when the revolution speed of the rotor increases above 2000 rpm.

Abstract: A rotary pump for volatile hydrocarbon fuels for use in a fuel system of an internal combustion engine in which a rotor combination has circumferentially spaced areas with ensmalling and enlarging pumping chambers such as a vane pump or a gear rotor pump. To allow purging of vapor from the pump to enable the pump to be self-priming and to pump against a pressurized fuel line under hot fuel conditions, a purge port passage is provided at the circumferential area in which the pumping chambers start to ensmall. This purge port includes a passage leading to the outside of the pump inlet into the body of liquid in which the pump is submerged. Vapor is purged from the pump through this passage to allow normal pumping pressure to develop upon starting of the pump.

Abstract: A scroll compressor comprises a housing including therein a suction chamber, a stationary scroll member including an end plate and a scroll element and being fixedly disposed within the housing, a movable scroll member including an end plate and a scroll element and being movably disposed within the housing to be capable of revolving around a center axis of the stationary scroll member but being prevented from rotating around its own axis, a plurality of working chambers each of which is defined by both scroll elements and moves centripetally and circumferentially while decreasing a volume thereof upon revolution of the movable scroll member, a stationary partition extending from an inner wall surface of the housing to the scroll element of the stationary scroll member, a movable partition radially reciprocatingly projecting from the inner wall surface of the housing and abutting against the scroll element of the movable scroll member, two suction chamber sections into which the suction chamber is divided by

Abstract: A throttle portion is formed in an intake port in a stationary scroll member to suppress an abnormal pressure rise which may take place when a refrigerant is sucked in the intake port, and a communication hole for communicating a low pressure space in a shell with a space inside an oldham's coupling, the inner space being formed by a recess of a bearing frame, the outer peripheral wall of the base plate of an oscillatable scroll member and the side surface of the wrap of the stationary scroll member.

Abstract: A hot melt foam adhesive system including a gear pump wherein gas is mixed under pressure into the molten adhesive and is driven into solution with the adhesive. The gas is supplied to the pump via a one-way check valve operative to prevent the back flow of molten adhesive to a gas flow control valve, regulator, and gauge. The check valve is positioned above the level of the pump so that molten adhesive cannot flow by gravity into the check valve. The check valve is so constructed that it is biased into a closed position by a spring on the gas side of the valve so that adhesive cannot collect around and foul the spring of the valve.

Abstract: In a scroll compressor, at least one suction port for gas is opened in a stationary end plate which has a spiral wrap. Gas is drawn directly into the compression chambers from the suction port. In addition, the suction port has an opening straddling both the radially extending surface of the stationary end plate at the outermost circumference of the compression chambers and the compression chamber side wall that is perpendicular to the radially extending surface, and the opening area of the suction port is relatively large.

Abstract: A scroll type fluid compressor with a capacity adjusting mechanism is disclosed. The compressor includes a housing, a first fluid inlet port, a second fluid inlet port and a fluid outlet port. A fixed scroll member is disposed within the housing and has a circular end plate from which a first wrap extends. The end plate of the fixed scroll member partitions the inner chamber of the housing into a front chamber and a rear chamber. The rear chamber is divided into a discharge chamber connected to the fluid outlet port, a first suction chamber connected to the first fluid inlet port and a second suction chamber connected to the second fluid inlet port. An orbiting scroll member is disposed in the front chamber and also has a circular end plate from which a second wrap extends. Both wraps interfit at angular and radial offsets to form a plurality of line contacts to define at least one pair of sealed off fluid pockets.