Abstract: An oil filtration and exhaust apparatus for filtering particulates and gases from the recirculating oil of a vacuum pump which is adapted to remove gases from a process enclosure. The oil filtration and exhaust apparatus removes particulates and gases from the recirculating oil by means of particulate filters and a gas scrubbing filter. Additionally, the exhaust gases are demisted prior to exhaust to an exhaust header. The apparatus is particularly suited to semiconductor manufacturing processes.

Abstract: The scroll gas compressor of the invention is so constructed that an enclosed container is partitioned by a fixed scroll member into a high pressure chamber and a low pressure chamber for gas-liquid separating intake refrigerant and storing it, the low pressure chamber being disposed at the lower portion and the high pressure chamber at the upper portion of enclosed container, the high pressure chamber disposing therein a drive unit related to a scroll compression mechanism and a lubricating oil sump, and the fixed scroll member serving also as part of the bottom of the lubricating oil sump, thereby providing that is small-sized, wide in an operational speed range, and superior in durability, and that prevents absorption of heat and noise propagation from the low pressure chamber serving as both the gas-liquid separation chamber and the reservoir of fluid, thereby improving the compression efficiency and lowering noise.

Abstract: A lubricant circuit and a process for circulating a lubricant through such lubricant circuit of a compressor unit incorporating a planetary rotating compressor having a piston in an opening of a cylinder-piston. One embodiment of a circuit and one embodiment of a process of this invention relies on pressure in a lubricant separator vessel to force the flow of lubricant through the circuit to the compressor, and used lubricant pump as a scavenge pump. Another embodiment of a circuit and another embodiment of a process of this invention relies on the pressure developed by the lubricant pump to force the flow of lubricant through the circuit to the compressor, and utilizes a float operated valve to maintain constant lubricant level in the lubricant separator vessel.

Abstract: A fluid management system for a rotary screw vacuum pump is provided in which lubricating fluid is transmitted to the vacuum pump from an oil supply reservoir while a coolant fluid is circulated to the vacuum pump from a fluid reservoir containing a supply of liquid coolant. After passing through the rotary compressor and lubricating the compressor one time, the lubricant merges with the coolant and the mixture is stored in the fluid reservoir to be reused as a coolant for the rotary screw compressor. The fluid reservoir containing the fluid is provided with a controller that senses the quantity of liquid within the fluid reservoir and provides additional liquid to the reservoir when the liquid levels falls below a predetermined magnitude. In addition, the controller drains liquid from the fluid reservoir when the liquid level within the reservoir exceeds a predetermined magnitude. A water soluble lubricant is used in association with water as a coolant in a preferred embodiment of the present invention.

Abstract: A hermetic scroll compressor is disclosed including within a hermetically sealed housing a fixed scroll member, an orbiting scroll member, and a crankshaft operably coupled to the orbiting scroll member and driven by a motor. The crankshaft has an axial passageway therein that is in fluid communication with an oil sump located in a discharged pressure chamber within the housing. Upon rotation of the crankshaft, a centrifugal oil pump delivers oil through the axial passageway to the bottom surface of a plate portion of the orbiting scroll member. An oil passage extends through the orbiting scroll plate to introduce oil into a discharge compression chamber established by the intermeshing fixed and orbiting scroll members. Accordingly, oil is introduced into the compression chamber and intermediate the scroll members without the creation of an intentional pressure leak. The size of the oil passage can be varied to affect the amount of oil introduced into the compression chamber.

Abstract: An oil-free screw compressor prevents a filter for separating oil mist from a gear case exhaust gas from clogging due to increase pressure loss in the filter, thereby suppressing increasing of an gear case inner pressure and further ensuring a removing of the oil mist from the exhaust gas. The oil-free screw compressor comprises a gear case exhaust pipe connected to a filter container containing a filter element for separating the oil mist, and a vacuum ejector having a suction port connected to second side space of the filter element contained in the container so as to make the pressure of the second side space of the filter element in the container negative pressure.

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: This invention discloses a lubricating mechanism of a hermetically sealed scroll type compressor in which an inner chamber of a housing is kept at suction pressure. The compressor includes a drive shaft supported by bearings in inner blocks. The drive shaft is operatively linked to an orbiting scroll which orbits within a stationary scroll. A rotation prevention device prevents rotation of the orbiting scroll. The drive shaft includes an axial bore extending from an open end and terminating adjacent a forward bearing. A pin extends from the end of the drive shaft to the orbital scroll. A passage links the axial bore to an opening at the end of the pin facing the orbital scroll. Radial bores are provided near the terminal end of the axial bore and at the rearward end of the axial bore near a rearward bearing. The radial bores link the axial bore to a suction chamber of the compressor to allow lubricating oil to lubricate the bearings. The narrow passages allows lubrication of the rotation prevention mechanism.

Abstract: A screw vacuum pump which includes a pair of screw rotors meshing each other with a small gap defined therebetween. A closing valve is provided in an oil circulation line leading from an oil stripper to a rotor chamber accommodating the screw rotors. A pressure switch for detecting a suction pressure is connected to the closing valve. When the suction pressure is lower than a predetermined value (i.e., at high level of vacuum), the closing valve is opened to supply the oil into the rotor chamber.

Abstract: A vacuum pump apparatus comprises a male and female screw rotors meshing with each other, a casing for accommodating the male and female screw rotors and having a working space, a suction port and a discharge port both communicating with the working space, bearing portions for supporting shafts of the male and female screw rotors on the suction and discharge sides thereof. Shaft seal portions which are respectively disposed between the working space and each of the bearing portions and are adapted to seal the shafts of the male and female screw rotors on the suction and discharge sides thereof. Seal gas introducing device introduces seal gas into the shaft seal portions, and a controller controls the pressure of the seal gas introduced into the shaft seal portions.

Abstract: The screw type vacuum pump comprises a pump casing having a suction inlet and a discharge outlet, and a pair of rotors incorporated within the pump casing and meshing with each other to rotate in synchronized manner. The vacuum pump evacuates a reaction vessel, to which process gas is applied, to obtain a negative pressure condition of a predetermined level. Upon operation of the pump, inert gas is introduced into a compression working chamber directly or through a sealing portion disposed adjacent the discharge outlet. The introduced inert gas is adiabatically compressed therein to generate heat to heat the rotors and a casing wall. Further the inert gas effects a reduction of partial pressure of the process gas in the pump. Accordingly, a side reaction product is prevented from accumulating on the rotors and the casing wall.

Abstract: In order to produce oil-free compressed air with a rotary compressor while avoiding the costs involved by a liquid-free compressor, a rotary compressor, especially a single screw rotary compressor is injected with water in which borate, preferably potassium borate is dissolved. This prevents corrosion at no additional cost while improving the bacterial purity of the air produced.

Abstract: An oil separating mechanism of a hermetically sealed scroll type compressor in which an inner chamber of a housing is kept at discharge pressure is disclosed. The compressor includes a drive shaft supported by a plain bearing in an inner block member. The drive shaft is operatively linked to an orbiting scroll which orbits within a stationary scroll. The drive shaft includes an axial bore extending from an open and termination within the inner block member. A radial bore is provided near the terminal end of the axial bore and links the axial bore to a discharge chamber of the compressor. A helical groove is formed on the exterior surface of the supported portion of the drive shaft. The helical groove is linked to the axial bore through a radial hole formed through the supported portion of the drive shaft.

Abstract: In a scroll compression apparatus having an orbiting scroll, a frame with a pressure regulation chamber adjacent the orbiting scroll wherein the frame includes a spring biased annular seal and a pressure responsive device in a discharge aperture through the frame for maintaining constant pressure in the pressure regulation chamber. Preferably, the frame includes an annular groove of rectangular cross-section accommodating a relatively smaller annular seal also of rectangular cross-section. An annular seal spring having a first planar surface and a second planar surface is disposed in the annular channel to bias the annular seal. The pressure responsive device has a first element exposed to discharge fluid pressure and a second element exposed to fluid at suction pressure such that the pressure differential serves to operate a piston for increasing or decreasing the flow area of the discharge aperture from the pressure regulation chamber.

Abstract: A screw compressor in which a pair of screw rotors supported by bearings and accommodated in a casing act to compress a gas and in which a slide valve disposed between an inner wall of the casing and the pair of screw rotors is capable of moving axially while maintaining a small gap between itself and the outer peripheries of the screw rotors, the rate of gas flow bypassed to an inlet port during compression being regulated by axially moving the slide valve.

Abstract: A compact scroll compressor capable of maintaining a high efficiency when driven at variable speeds and operating at variable gas pressures. The compressor incorporates a unique swing-link driving means and means to control the flow of high-pressure fluid from the central high-pressure zone defined by the scroll members. The compressor is particularly suited for operation off an automotive engine to provide compressed refrigerant in an automotive air conditioner.

Abstract: The present invention provides a low-pressure scroll compressor for use in a refrigerating system of an air conditioning apparatus or the like. Lubricating oil is intermittently supplied to a compressor unit in proportional relation to the rotating number of the motor, avoiding an excessive or insufficient supply of a lubricating oil and realizing a proper supply of the lubricating oil even in high-speed rotation of the motor. Thus the compressor is highly reliable. Further, a screening plate is provided in the suction space of a compressor, so that the lubricating oil in the coolant or cooling medium can be effectively separated from the coolant, resulting in enhancement of collecting efficiency of the lubricating oil. Moreover, the screening plate is useful to prevent a hermetic terminal from being cooled by the returning coolant. Otherwise, dew condensation would occur on the hermetic terminal, and leakage or shortcircuiting would be caused, a vital obstacle to the safety 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 sliding-vane rotary compressor of the type having a cylinder, a rotor rotatably disposed therein and carrying thereon a plurality of vanes, a pair of side blocks attached to opposite ends of the cylinder, and a pair of heads attached to the side blocks, respectively, the improvement which comprises a partition wall separating an oil sump from a low pressure chamber which is defined by and between one of the side block and the head attached thereto, and at least two connecting passages interconnecting the oil sump and a high pressure chamber which is defined by and between the other side block and the head attached thereto.

Abstract: An intermittently operating pneumatic vane pump has a cylindrical seat for its rotor constituted by a ring of porous sintered material housed in a container. The lubricating oil is collected in an interspace between the ring and the container when the pump is operating and returns to the pump when the pump is stopped, to keep the ring of the seat impregnated.

Abstract: A scroll compressor is run with a clearance between the wraps and oil is injected between the wraps for sealing. In addition to providing a sealing function, the oil also provides a lubrication function prior to injection.

Abstract: A screw compressor assembly includes a motor housing section, a compressor section and an oil separator downstream of the compressor discharge port. The motor housing section defines a flow path for suction gas traveling to the working chamber of the compressor so that the compressor drive motor is cooled by suction gas. The motor housing section also internally defines an integral heat exchange structure through which a passage for the flow of oil is defined. Discharge pressure in the oil separator drives separated oil into the passage in the motor housing heat exchange structure prior to the delivery of such oil to compressor surfaces requiring lubrication. The oil flowing through the integral heat exchange structure is cooled by the suction gas passing over the surface of the heat exchange structure interior of the motor housing.

Abstract: A scavenging system for single screw compressors to remove residual liquid eal from an open combustion chamber prior to controlled liquid seal injection. The removal of residual liquid seal is accomplished by providing the casing with a scavenging slot which surrounds a portion of the open combustion chamber thereby allowing centrifugal force to radially remove residual liquid seal.

Abstract: A rotary vane pump comprising an inner rotor and an outer rotor which rotate together about eccentric axes. A pair of support shafts is attached to the inner rotor and are rotatably mounted for rotation of the inner rotor. At least one of the support shafts is hollow and serves as a fluid conduit. The outer rotor and the inner rotor are provided with ports at the ends thereof for flow of fluid into the inner rotor. The relative dimensions of the rotors are such that a chamber is formed between the rotors. A vane is attached to the outer rotor and slidably extends into a slot in the inner rotor. The vane divides the chamber into intake and outlet portions. Fluid flows from the inner rotor into the chamber between the rotors, and fluid flows from the chamber into a fluid conduit formed by the hollow support shaft. The rotary vane pump is adapted to pump fluids, such as gases and liquids, separately or in combination.

Abstract: In a rotary compressor for refrigerants of the type having, within a sealed case, a refrigerant compressing device and a motor disposed thereabove for driving the same and having a vertical rotor shaft, an oil-separating member of umbrella shape with a downwardly-directed peripheral rim is disposed coaxially above and fixed relative to the top end of the rotor and functions to guide compressed refrigerant containing lubricating oil particles toward and through the motor windings of the motor thereby to separate the oil particles from the refrigerant, which is then delivered under pressure.

Abstract: A body located downstream of the compressor discharge port in an oil-injected screw compressor assembly includes a contoured surface for directing the flow of the gas-oil mixture discharged from the compressor. The body is movable in the compressor assembly between a first position in which the flow of the mixture out of the discharge port is unimpeded and a second position in which the backflow of gas from downstream of the discharge port back into and through the working chamber of the compressor is prevented. In the first position the body facilitates the separation of oil from the discharged compressed gas while in the second position the reverse direction rotation of the screw rotors in the compressor working chamber is prevented.

Abstract: An oil-free rotary gas-compressor system includes an oil-free rotary gas-compressor (2) having a high, built-in pressure ratio and an injector arrangement (13) for injecting a vaporizable liquid, preferably water, into the compressor (2) for cooling the gas during the compression process. It is known in high-speed compressors to utilize water injection which is so restricted that the water is completely vaporized, to thereby obtain a good cooling effect. The efficiency of the compressor is limited, however. In known systems, high compressor efficiencies are obtained by injecting large quantites of water, although the compressor speed must then be considerably reduced, resulting in a lower compressor capacity.

Abstract: A sealed scroll compressor comprises a scroll compressor section, an electric motor, a sealed container, an oil storage, a fixed and orbiting scroll members, and a wire mesh member for improvement of oil separation in refrigerant gas. A shell portion of said sealed container is lined annularly with the wire mesh member and the gas containing oil is adapted to flow downwardly along the wire mesh member. When the gas flows downwardly, the oil sticks to the wire mesh member and is separated from the gas. The oil collected on the wire mesh member drops down into the oil storage. The gas from which the oil is separated is, after that, discharged out of the compressor.

Abstract: The scroll type compressor has a hermetic casing, and a scroll compressor section and an electric motor section which are contained within the hermetic casing. These compressor and electric motor sections are fitted through a frame in the hermetic casing. In a portion of the frame intermediate between the compressor and the electric motor section, a plurality of segmented concave spaces are defined. At an upper portion in the hermetic casing, a discharge space which communicates with a discharge port of the scroll compressor section is defined. Further, in a portion of the casing between the compressor and the motor section, a delivery port which open to one of the concave spaces in the frame is provided. Furthermore, at least one fluid passage is provided in an outer periphery of the compressor section and this passage makes the discharge space communicate with the other concave spaces in the frame.

Abstract: In a rotary compressor having a motor element and a compression element contained in a sealing case, an oil separating device for separating lubricating oil from an oil-containing refrigerant is attached on the rotor of the motor element. The oil separating device has a circular plate having a diameter substantially equal to the outer diameter of the rotor, wherein a channel-like recess projecting toward the rotor is formed in the circular plate at a position deviated from its central portion; the lower surface of the channel-like recess is adapted to be firmly connected to the upper surface of the rotor, and an aperture is formed at the central portion so that the discharge tube is loosely inserted in the aperture.

Abstract: The present invention overcomes performance losses of positive displacement compressors due to internal liquid recirculation. This is achieved by removing or scavenging liquid that leaks out of the compression pocket before it is captured by another lower-pressure compression pocket of the compressor. The scavenged liquid is collected in the bottom of the compressor pressure vessel and cooled before it is reinjected into the compressor to complete the cycle.

Abstract: A rotary air compressor of oil sealed type includes a stator containing a rotor, oil injectors arranged to inject oil into the interior of the stator, an oil sump connected by a first oil pathway to the oil injectors and an oil cooler situated in the first oil pathway. A thermally responsive valve situated in the first oil pathway is arranged to open only when the temperature of the oil has reached a predetermined value whereby no oil is injected through the oil injectors before the temperature of the oil has reached the said predetermined value.

Abstract: A horizontal type rotary compressor comprising radial partitioning walls in a discharge silencer. A slant portion is formed in the partitioning walls thereby enabling the oil within the discharge silencer to be discharged to the outside of the silencer. Thus, a noise generation due to a cavity resonance in the discharge silencer and an impact noise of a discharge valve in the oil may be prevented. At the same time, a carbonization of the oil, caused by an increase of the oil temperature, may also be prevented.

Abstract: In a first embodiment, the invention comprises supplanting the usual, single, electrically-operated, blowdown valve, located on the receiver/separator tank of a gas compressor system with a pair of valves operatively arranged in parallel. The one valve operates normally in the manner of the supplanted valve, albeit with reduced venting capacity, and the other is held closed on starting of the compressor. This restricts the venting of the tank and causes its quick pressurization, to induce prompt oil injection for the compressor. A sensor detects the injection oil temperature and when the latter has achieved a given setpoint, the other, vent-restricting valve is opened. Accordingly, the method comprises sensing the temperature of the oil injected into the compressor and holding one of the paired venting valves closed until the oil temperature reaches the aforesaid given or predetermined setpoint.

Abstract: A positive displacement scroll type apparatus having first and second scrolls with interfitting vanes defining an interface which includes at least one close pocket adapted to move fluid from an inlet to an outlet. The outlet is located in one of the scrolls and is subjected to centrifugal force during operation of the compressor and this in turn causes the separation of lubricant from the compressed fluid by such centrifugal force. A lubricant collector is located at the outlet to prevent the lubricant from entering the remainder of a system with which the compressor may be associated.

Abstract: To design a compressor system with a screw-type compressor, the housing of which has cavities for air guidance and oil separation, in an economical way for small delivery quantities, there is a disc-shaped housing with a longitudinal dimension corresponding essentially to the rotor length, and in this housing the compressed air flowing out of the compressor and mixed with oil is deflected in a radial and a peripheral direction for oil separation. The oil separator, the oil filter and the air filter are attached as separate units to the end face of this housing. The bearing plate of the drive motor is designed as a mechanical transmission space.

Abstract: A positive displacement rotary compressor includes a stator which contains a rotor and has a stator inlet communicating with atmosphere via a first pilot operated valve and a stator outlet connected to a primary lubricant reservoir via a non-return valve and to an auxiliary lubricant reservoir via a second pilot operated valve and one or more lubricant injection orifices arranged to inject oil into the stator and connected to the primary reservoir via a third pilot operated valve and to the secondary reservoir. The compressor also includes a pilot control system responsive, in use, to the compressed air load to which the compressor is subjected and arranged to switch the first and third pilot operated valves from an open position to a closed position and the second pilot operated valve from a closed position to an open position when the compressed air load falls below a predetermined value. The auxiliary lubricant reservoir is always at substantially atmospheric pressure.

Abstract: A scroll compressor enclosed in a hermetic shell, wherein part of the volume enclosed by the shell is at suction pressure and part is at discharge pressure. The compressor includes both a stationary and a driven scroll plate, with intermeshed involute wrap elements attached to the plates for defining pockets in which fluid is compressed as a drive shaft connected to the driven plate causes it to orbit relative to the stationary scroll plate. A passage disposed within the driven plate and adjacent its axial center conveys compressed fluid through the plate and into a cavity formed in the end of the drive shaft. Oil entrained in the compressed fluid is thrown radially outward within the cavity, due to centrifugal force, and is thereby separated from the compressed fluid. The oil then flows through an adjacent bearing, and is thrown radially outward, creating a spray that impinges on a seal which abuts the back surface of the driven scroll plate.

Abstract: The invention pertains to a two-stage vacuum pump for servicing refrigeration systems wherein a pair of electrically driven rotors support movable vanes engaging the cylindrical circumference of pumping chambers in which the rotors are mounted. The improvements pertain to the sealing of the rotor shaft, the introduction of metered oil into the pump, and the keying of a rotor to its driveshaft wherein improved assembly and operational characteristics are achieved.

Abstract: A lubricating system for a scroll type compressor is described. The compressor unit includes a housing having a front end plate and a cup shaped casing. A fluid inlet port is formed on the cup shaped casing and has a step portion radially projecting from an inner surface thereof. A first oil passageway is formed through the cup shaped casing with one end opening at the inner wall of the inlet port adjacent to the step portion. A second oil passageway is formed through the front end plate and connects with the first oil passageway. One end of the second oil passageway opens to a shaft seal cavity formed on the front end plate. Therefore, the shaft seal cavity is connected with the fluid inlet port by the first and second oil passageways, and the shaft assembly is lubricated and cooled by lubricating oil and suction gas flowing through the oil passageway.

Abstract: A lubricating system for a scroll type compressor which includes a housing having a front end plate and a cup-shaped casing. A fluid inlet port is formed on the cup-shaped casing positioned opposite and opening onto a rotation preventing/thrust bearing device. In one embodiment, a cut portion may be formed in the fixed ring of the rotation preventing/thrust bearing device opposite the fluid inlet port. An oil passageway may then be formed in the front end plate to communicate between the cut portion and a shaft seal cavity.

Abstract: In a refrigerant compressor for use in an air conditioning system, a lubricating oil-separating device is mounted in the discharge pressure chamber communicating with pump outlets of the pump assembly and also with the discharge port. The lubricating oil-separating device comprises a plurality of tubes vertically disposed in a direction traversing flows of compressed refrigerant. The tubes each have at least one recess formed in a portion of its peripheral surface facing downstream of the compressed refrigerant flow, and an opening formed in the recess and communicating with the interior of the tube, whereby compressed refrigerant in the form of von Karman's vortices formed immediately downstream of the tube is introduced into the interior of the tube to thereby effectively separate the lubricating oil from the refrigerant.

Abstract: A compressor, particularly such suited for use in motor vehicles, especially passenger cars, for instance, in the air conditioning systems thereof, includes a stator including a housing bounding an internal space accommodating a rotatable body of a rotor. An internal surface of the housing and an external surface of the rotatable body together form at least one compression space of a varying radial dimension as considered in the circumferential direction. The rotary body is provided with a plurality of recesses each of which partially receives a respective vane for reciprocation in contact with the internal surface of the housing, such that the vanes subdivide the compression space into a plurality of compartments. The medium to be compressed is sequentially admitted into the respective compartments through respective inlet openings provided in the stator. The compressed medium is discharged from the respective compartments through a passage provided in the interior of the rotary body.

Abstract: A helical screw rotary compressor for a closed loop refrigeration system such as an air conditioning system for a bus or like vehicle is connected in series with a condenser and an evaporator, in that order, with the evaporator at a raised position relative to the compressor and utilizes a vaporizable refrigerant which is miscible with a lubricating oil employed to lubricate the moving components of the screw compressor. The bus engine driven, clutch operated, helical screw rotors are mounted within parallel intersecting bores within the compressor housing. A slide valve underlies the intermeshed rotors and forms a portion of the screw compressor envelope, the rotors opening to a suction port connected to the outlet side of the evaporator above the rotors. A high pressure discharge port at one end of the intermeshed rotors leads to an auxiliary chamber bearing an unload cylinder which drives the slide valve and which opens at the top to a housing discharge port leading to the condenser.

Abstract: A scroll type fluid displacement apparatus including a housing divided into a discharge chamber and a suction chamber is disclosed. A fixed scroll member is disposed within the housing and comprises a first end plate and a first wrap which extends from one end surface of the first end plate. The discharge chamber is formed adjacent the fixed scroll member on the side of the first end plate opposite the side thereof from which the first wrap extends. An annular shaped dividing wall is formed at the end surface of the first end plate and extends into the interior of the discharge chamber. The discharge chamber is partitioned into two chambers by the dividing wall. At least one hole is formed through the dividing wall to connect the two chambers of the discharge chamber. The dividing wall is provided with a deflecting member for bending the fluid flow of the discharging fluid. At least one oil separating member is disposed in a fluid passageway upstream of a fluid outlet port from the housing.

Abstract: A rotary piston pump includes a casing and partitions within the casing defining an expansion chamber and with a gear and bearing chamber on one side of the expansion chamber and a bearing chamber on the other side. The partitions between the expansion chamber and the bearing and gear and bearing chambers are provided with passages for receiving shafts serving for the transmission of the rotary movement from gears to the pistons of the pumps. The passages between the chambers are provided with split seals which are composed of two parts separated by a pressure equalization chamber.

Abstract: An air compressor wherein oil mist lubricates a rotor stator in the compressor casing whereby an oil mist is produced in the compressed air provided with primary and secondary oil removal sections. The primary and secondary oil removal sections are connected by an oil separation manifold. The manifold and the secondary oil removal section are in a housing detachable from the main compressor housing. The main and detachable housings communicate with a tube which has apertures in its side wall at its inlet end which end communicates with the interior of the main housing and apertures in its side wall at its outlet end which end communicates with the manifold.

Abstract: A compressor that uses an excess of lubricant for sealing and cooling is driven by a natural gas engine and pumps natural gas to a transmission outlet, the lubricant drawing off moisture from the gas and portion then being pumped through a circuit in which moisture is removed after which the lubricant is returned to the compressor.

Abstract: A screw compressor with liquid injection wherein the units previously disposed separately from one another, such as the air filter, liquid separator, and so on, are integrated into a single housing. Various compartments are formed in the housing by means of partitions, such that the compartments provide for good separation of entrained liquid from the compressed air being achieved because of large flow cross-section, maximum utilization of the available flowpath and multiple deflection of the current of compressed air. The compact construction results in a substantially smaller overall compressor size than that of comparable known compressor plants, in a reduction of manufacturing cost and simplification of the assembly of a compressor plant.

Abstract: An oil separator in combination with an oil lubricated vacuum pump. The separator includes a hollow housing having one end disposed adjacent the suction opening of the pump and the other end adapted for attachment to a vacuum line. A valve seat comprises an internal surface of the housing, and a resilient elastic sealing element having a relatively low mass is positioned under tension on the valve seat between the seat and the suction opening. The sealing element permits a stream of air from the vacuum line to enter the suction opening of the pump while preventing oil from the pump from passing into the vacuum line.