Abstract: An electric drive hydraulic fracturing pump system includes one or more electric motors, with each electric motor electrically coupled to a dedicated dual inverter to control operation of the motor. A plurality of electric motors may be coupled to each end of a pump crankshaft and configured to provide rotational power to the power end of a hydraulic fracturing pump through a planetary gearset coupled to each end of the crankshaft. A hydraulic cooling circuit having a first and second cooling systems may be used to regulate the temperature of the electric motors and dual inverters.

Abstract: An electric drive hydraulic fracturing pump system includes one or more electric motors, with each electric motor electrically coupled to a dedicated dual inverter to control operation of the motor. A plurality of electric motors may be coupled to each end of a pump crankshaft and configured to provide rotational power to the power end of a hydraulic fracturing pump through a planetary gearset coupled to each end of the crankshaft. A hydraulic cooling circuit having a first and second cooling systems may be used to regulate the temperature of the electric motors and dual inverters.

Abstract: In a pump arrangement for a hydraulic unit of a vehicle brake system having a pump housing and a pump piston which is guided so as to be displaceable axially back and forth in the pump housing, a damping element is provided radially between the pump piston and the pump housing. The damping element damps vibrations of the pump piston which occur during an operation of the pump arrangement.

Abstract: A piston pump for a vehicle brake system includes a piston which is mounted in a cylinder so as to be movable along an axis. An inlet valve for introduction of fluid into the cylinder, and a sealing element configured to seal off the piston with respect to the cylinder are located on the piston. A first portion of the piston includes a valve seat of the inlet valve, and a second portion of the piston includes a piston rod. The sealing element includes a projection which engages axially over the first piston portion and extends to the second piston portion.

Abstract: A human-powered pump assembly includes a frame and a treadle pivot attached to the frame, such that the treadle pivot defines a horizontal rotational axis. The pump assembly includes a pair of treadles coupled to the treadle pivot and a rocker pivot attached to the frame, such that the rocker pivot defines a separate horizontal rotational axis. The pump assembly includes a reciprocating rocker coupled to the rocker pivot and to the pair of treadles to constrain the motion thereof, such that the rocker pivot axis is located below the treadle pivot axis.

Abstract: A double acting dual stroke fluid pump with pressure assists is disclosed. First and second pistons are mounted to a common shaft which reciprocates during compression and suction strokes. During each of the strokes, fluid is pumped out at an outlet. This is accomplished by way of a one-way valve on the second piston. The one-way valve is opened or closed depending on whether the first and second pistons are in the compression or suction strokes. Additionally, pressure from the outlet assists in traversing the first and second pistons in the compression stroke. During the suction stroke, the fluid pressure applies a force on the first piston to counteract the fluid pressure on the second piston so that a smaller spring may be used. The size requirements of the solenoid and spring are reduced.

Abstract: A pressure intensifier including reciprocating pistons located in respective piston chambers, and a valve mechanism which reciprocates corresponding to movement of the pistons. A pressurized fluid is received by the intensifier and is routed to the piston chambers via movement of the valve mechanism to drive the pistons for boosting pressure of an outgoing fluid. Thus, the pressure of the incoming fluid is used to boost the pressure of the outgoing fluid.

Abstract: A combination compressor and vacuum pump apparatus comprising a common drive mechanism, a compressor piston-cylinder unit mechanically coupled to the drive mechanism, the compressor piston-cylinder unit comprising a hollow first piston rod connected to the drive mechanism at a first free end substantially opposite a first piston operable within a first cylinder so as to form the compressor piston-cylinder unit, and a vacuum pump piston-cylinder unit mechanically coupled to the drive mechanism, the vacuum pump piston-cylinder unit comprising a hollow second piston rod connected to the drive mechanism at a second free end substantially opposite a second piston operable within a second cylinder so as to form the vacuum pump piston-cylinder unit, whereby air is pulled into the compressor piston-cylinder unit through the first piston rod for compression therein and air is exhausted from the vacuum pump piston-cylinder unit through the second piston rod.

Abstract: A positive-displacement reciprocating compressor comprising a “non-conventional” crank mechanism which eliminates the amount of frictional force between the wall of the piston and the wall of the cylinder, whose characteristic feature is to have a planet (20) made of sintered material, with self-lubrication properties, allowing to eliminate bushings or similar additional elements. An economical and structurally simple lubrication system, which preferably comprises a classical link rod/crank mechanism, utilizes the mechanical energy provided by the drive shaft of the compressor and sends the lubricant (oil) in a precise manner to the surfaces that need to be lubricated. This oil is easily retained by the very small grains of the sintered material. Moreover, a valve system based on a single plate simplifies the structure of the cylinder unit (30).

Abstract: A double acting dual stroke fluid pump with pressure assists is disclosed. First and second pistons are mounted to a common shaft which reciprocates during compression and suction strokes. During each of the strokes, fluid is pumped out at an outlet. This is accomplished by way of a one-way valve on the second piston. The one-way valve is opened or closed depending on whether the first and second pistons are in the compression or suction strokes. Additionally, pressure from the outlet assists in traversing the first and second pistons in the compression stroke. During the suction stroke, the fluid pressure applies a force on the first piston to counteract the fluid pressure on the second piston so that a smaller spring may be used. The size requirements of the solenoid and spring are reduced.

Abstract: A quintuplex mud pump has a crankshaft supported in the pump by external main bearings. The crankshaft has five eccentric sheaves, two internal main bearing sheaves, and two bull gears. Each of the main bearing sheaves supports the crankshaft by a main bearing. One main bearing sheave is disposed between second and third eccentric sheaves, while the other main bearing sheave is disposed between third and fourth eccentric sheaves. One bull gear is disposed between the first and second eccentric sheaves, while the second bull gear is disposed between fourth and fifth eccentric sheaves. A pinion shaft has pinion gears interfacing with the crankshaft's bull gears. Connecting rods on the eccentric sheaves use roller bearings and transfer rotational movement of the crankshaft to pistons of the pump's fluid assembly.

Abstract: The invention relates to a method for feeding pasty masses using a pump device which has a piston pump with at least two cylinders, each having one piston, wherein each cylinder of the pump device is connected to a pre-fill container via an inlet opening, which can be closed by an inlet slide valve associated with the cylinder, and wherein each cylinder of the pump device is connected to a feed line via an outlet opening, which can be closed by an outlet slide valve associated with the cylinder, wherein pasty mass is fed from the pre-fill container into the respective cylinder during a suction stroke of a cylinder with the inlet opening open and the outlet opening closed, and wherein pasty mass is fed into the feed line during a pump stroke of a cylinder with the outlet opening open and the inlet opening closed, wherein the piston velocity is greater during the suction stroke than during the pump stroke, and wherein at the end, toward the end or shortly after the end of the suction stroke, the inlet opening i

Abstract: An air pump operably by a motor to pump air is disclosed to include a body, an airbag unit, which is mounted in the body has multiple airbags each having an air chamber and an air inlet, a lifting mechanism rotatable by the motor to move the airbags to pump air, a plurality of air intake control valves movably set between the air inlet of each airbag and respective air inlets of the lifting mechanism to control the air passage between the air inlet of each airbag and the air inlets of the lifting mechanism subject to the operation status of the airbags, and an exhaust structure coupled to the airbag unit for exhaust of air from the airbags.

Abstract: A piston pump includes a first piston pump including a first piston and a first pump chamber, a second piston pump including a second piston and a second pump chamber, the second piston operating to follow the first piston, a pressure release passage formed in communication with the second pump chamber, and a relief valve provided at the pressure release passage and defining an upper limit discharge pressure of the second piston pump. When a discharge pressure of the second piston pump is equal to or smaller than the upper limit, a discharge fluid of the second piston pump is added to that of the first piston pump so as to flow into an outlet port. When the discharge pressure exceeds the upper limit, the discharge fluid is released to the pressure release passage and the discharge fluid of the first piston pump only flows to the outlet port.

Abstract: A multiple-chamber, multiple-stage reciprocal pump for compressing air through a series of up-strokes and down-strokes. The pump includes an upper reciprocal portion and a fixed portion. The fixed portion further includes a base housing with an ambient air inlet cavity and a compressed air outlet cavity formed therein. It further includes an outlet valve body fixed to the base housing with an outlet valve pneumatically coupled to direct high-pressure compressed air into the outlet cavity. The outlet valve body also has an inlet port pneumatically coupled to the inlet cavity, and there are plural cylinders coupled to the outlet valve body, which slideably and sealably engaged with the upper reciprocal portion, thereby enabling the series of up-strokes and down-strokes to compress air.

Abstract: Disclosed are a reciprocating compressor and a refrigerator having the same. The reciprocating compressor comprises a casing, one reciprocating motor mounted at a frame unit provided in the casing for generating a linear-reciprocation driving force, a first compression unit for compressing a refrigerant directly sucked without passing through the inside of the casing by receiving the driving force of the reciprocating motor, and a second compression unit for mixing a refrigerant introduced into the casing and a refrigerant discharged from the first compression unit and then compressing the mixed refrigerant once more by receiving the driving force of the reciprocating motor. Accordingly, a refrigerant is consecutively compressed two times, components are simplified, and the compressor is easily controlled. Also, the refrigerator having the reciprocating compressor decreases a load of the reciprocating compressor thereby to enhance the efficiency of the refrigerator.

Abstract: An apparatus capable of receiving oil and gas from a recovery or other input source, compressing and/or pumping said oil and gas using multi-phase compressors with heat exchange means, and delivering said compressed gas to various destinations, including for use in oil and gas recovery.

Abstract: A linear compressor for multi-compression includes a stationary cylinder, a moving piston, and a stationary piston. The stationary cylinder has a first compression chamber formed therein. The stationary cylinder is provided at one side thereof with an outlet part. The moving piston is movable forward and backward by a linear motor, that compresses a fluid in the first compression chamber. The moving piston has a second compression chamber formed and is provided, at the position where the second compression chamber communicates with the first compression chamber, with a first valve. The stationary piston is fixedly disposed in the compressor. The stationary piston is fitted in the moving piston so that the fluid in the second compression chamber is compressed as the moving piston is reciprocated.

Abstract: A liquid well pumping arrangement, especially for oil wells, comprising a pair of adjacent downhole reciprocating pumps each having a barrel, a piston rod connected to a piston slidable within the barrel, and valves adapted to cause liquid to flow from a lower inlet of the barrel to an upper outlet from the barrel when the piston is reciprocated in the barrel. The arrangement includes a well head pumping mechanism for applying reciprocating movement to sucker rods to cause movement of the pistons, the well head pumping mechanism being arranged to reciprocate each of the pistons at the same cyclic rate but with the motions of the two pistons being out of phase by 180°. A single delivery tube is connected to both of the outlets from the barrels such that, with the pumping mechanism operating, a substantially continuous flow of liquid can be produced from said delivery tube.

Abstract: A rotary piston machine includes a first spheroidal element including pistons and/or cylinders and a second spheroidal element including pistons and/or cylinders, wherein the first element can move relative to the second element. The machine can be used as part of a pump, compressor, or engine.

Abstract: A compact 180° opposed piston pump/compressor minimizes axial spacing between its pistons on the drive shaft and thereby reduces the shaking couple and noise from reciprocation. Each piston has its own eccentric element press-fit into the connecting rods so as not to occupy space between the pistons. The shaking couple can be further reduced for pistons of different masses by selecting the mass of the cup retainers to compensate for the difference in overall piston masses. The pump also includes an improved cylinder sealing arrangement having a circumferential groove in an angled surface at the end of the cylinder. The pump also has a special cover and seal for closing the open neck of the pump crankcase and an improved multi-lobed valve stop. The pump further uses tubular transfer members for transferring intake and/or exhaust air into the crankcase and/or between valve heads.

Abstract: A gas compressor and method according to which a piston assembly reciprocates in a bore to draw the fluid to be compressed into the bore during movement of the piston unit in one direction and to compress the fluid during movement of the piston unit in the other direction.

Abstract: The invention relates to a piston engine which is essentially comprised of an engine shaft and a set of modules, each of which comprises a cylinder and a piston powered by the engine shaft in the cylinder, each module resulting in vibratory excitation of the engine at a determined fundamental frequency. Rather than introducing phase differences between the various vibratory excitations, as is the case in prior art, the invention introduces a frequency offset between the fundamental frequencies thereof in order to avoid a high-amplitude vibration at a common excitation frequency, arising from the spectral spread thus obtained.

Abstract: A casing body is formed with a vent hole. The casing body has an inner face formed with a plurality of grooves respectively communicated with the vent hole. A plurality of diaphragms are respectively inserted into the grooves to form a plurality of pump chambers. An actuator actuates the diaphragms to compress or decompress the pump chambers.

Abstract: The invention concerns a pump for compression of gases, such as air, of the type comprising a first cylinder and a second cylinder, a piston dividing said first cylinder into a first chamber located ahead of the piston and a second chamber located behind the piston, the piston and the second cylinder arranged to be displaced jointly relative to the first cylinder. A third chamber is formed between end walls of the cylinders and communicates with said second chamber via at least one opening formed in the jacket wall of the first cylinder. The pump is characterized by an inlet provided in the second end of the second cylinder in order to allow passage of air into a fourth chamber formed between the second end of the second cylinder and the end wall of the first cylinder, said fourth chamber communicating with said third chamber via a through-passage channel, wherein a valve is provided, formed in the end wall of the first cylinder.

Abstract: A gas compressor and method according to which a piston assembly reciprocates in a bore to draw the fluid to be compressed into the bore during movement of the piston unit in one direction and to compress the fluid during movement of the piston unit in the other direction.

Abstract: A gas compressor and method according to which a plurality of inlet valve assemblies are angularly spaced around a bore. A piston reciprocates in the bore to draw the fluid from the valve assemblies during movement of the piston unit in one direction and compress the fluid during movement of the piston unit in the other direction and the valve assemblies prevent fluid flow from the bore to the valve assemblies during the movement of the piston in the other direction. A discharge valve is associated with the piston to permit the discharge of the compressed fluid from the bore.

Abstract: The fluid machine can be used as a pump, compressor, motor and internal combustion engine and is characterized by two mobile opposite cylinders fixed rigidly to each other. Said cylinders move simultaneously in the same direction. Inside the opposite cylinders there are two fixed opposite pistons rigidly secured to the housing and each said piston is made with suction and discharge valves designed to connect the working cavity between the corresponding piston and cylinder with low and high pressure sources.

Abstract: A portable, high capacity air compressor system for charging air tanks over wide pressure ranges with maximum volumetric efficiency is characterized by employing a shuttle piston assembly in which piston pairs are arranged with axially aligned cylinder pairs to reciprocate in response to precession of a wobble plate, and each of the pistons is further characterized by being of one-piece construction with a built-in leaflet-type intake valve in its piston head, and a universal connector between each of the piston pairs and wobble plate which is stabilized within a pair of guide rails.

Abstract: A manual air pump with a handle includes a base member, a foot switch, an outlet cylinder, an inner cylinder and a pumping assembly. The foot switch is mounted on the base member. The outlet cylinder is mounted vertically on the base member. The inner cylinder is mounted vertically on the base member in the outer cylinder. The pumping assembly is moveably mounted in the outer cylinder and securely attached to the inner cylinder. Multiple check valves are mounted in the cylinders and the base member to form two stages to pump the air into the object to be inflated in a great quantity when the object to be inflated is in a low-pressure condition and easily pump compressed air into the object to be inflated when the object to be inflated is in a high-pressure condition.

Abstract: The invention concerns a pump (1) for compression of gases, such as air, of the type comprising a first cylinder and a second cylinder (3 and 4, respectively), a piston (8) dividing said first cylinder (3) into a first chamber (10) located ahead of the piston and a second chamber (11) located behind the piston, the piston (8) and the second cylinder (4) arranged to be displaced jointly relative to the first cylinder (3). A third chamber (20) is formed between end walls (5, 18) of the cylinders (3, 4) and communicates with said second chamber (11) via at least one opening (25) formed in the jacket wall of the first cylinder.

Abstract: A manual air pump includes an outer tube and an inner tube coaxially mounted in the outer tube. An inner chamber is defined in the inner tube. An outer chamber is defined between the outer tube and the inner tube. A head is coupled to first ends of the inner and outer tubes. The head includes a main passage communicated with the inner chamber and the outer chamber for supplying air to an object to be inflated. An inner piston rod has a first end with an inner piston slidably received in the inner chamber. The inner piston separates the inner chamber into a first chamber section adjacent to the head and a second chamber section distal to the head. An outer piston rod has a first end with an outer piston slidably received in the outer chamber. The outer piston separates the outer chamber into a third chamber section adjacent to the head and a fourth chamber section distal to the head. A handle is secured to second ends of the inner and outer piston rods to move therewith.

Abstract: A dual acting pump for dispensing pressurized liquids including a pump housing, a reciprocating pump shaft contained in a pumping chamber and at least one spring-biased check valve member. In the preferred embodiment, a spring-biased check valve member is connected to one end of the pump shaft for closing a flow passage in the pump shaft during movement in one direction and for opening the flow passage during movement in the opposite direction. Similar spring-biased check valves are connected to the pump inlet and pump outlet. The check valves comprise hollow balls and, in combination with the springs, this assures that liquid output from the pump is not reduced significantly when the pump shaft changes direction.

Abstract: The invention relates to a piston pump with a piston received axially displaceably in a pump bore. To improve the aspiration performance of the piston pump. A cuff with a U-shaped annular cross section is provided, the cuff is inserted into the pump bore surrounding the piston, an outer lip forms a diaphragm, which rests against a wall of the pump bore and is acted upon on its outside with ambient pressure through a venting bore. The cuff is part of a fluid storage element, which makes an additional fluid volume available to the piston pump. The diaphragm acted upon by ambient pressure creates a pumping effect, if a fluid pressure in the fluid storage element drops below ambient pressure in an intake stroke of the piston.

Abstract: A pneumatic cylinder for actuating fume extraction valves in fume and heat extraction plants has a piston (2) that may be actuated from both sides with at least one working surface and that can be made to slide by pressurised air in a cylinder (1) with at least one working chamber (4), as well as an energy accumulator with regulating means. The regulating means can be controlled by control means to open or keep open the fume extraction valves. In order to obtain a compact pneumatic cylinder for a fume and heat extraction plant which is easy to install, a storage chamber in which air or pressurised air is stored as compressible pressure medium is provided as energy accumulator. The storage chamber is in communication with a compression surface (7) of the piston (2), at its side opposite to the working surface (7), so that pressure medium may flow between the storage chamber and the compression surface (7).

Abstract: The present invention relates to a pump, more particularly a radial piston pump, including at least two pump pistons (10) with an associated working chamber (13) each, wherein the working chambers (13) are connected to suction lines (4) by way of suction valve devices (8) and to a joint pressure line (5) by way of pressure valve devices (9), wherein at least one of the suction valve devices (8) opens during the pressure stroke in dependence on the pressure in one of the associated lines (4, 5), and wherein at least one of the suction valve devices (8) opens during the pressure stroke in dependence on the pressure in the pressure line (5).

Abstract: A compressor assembly includes a compressor mechanism mounted within a hermetically sealed housing. The housing is effectively divided into a low pressure area at a relatively low temperature and a high pressure area at a relatively high temperature. A motor and a lubrication system are contained within the low pressure area and the discharge side of the compressor mechanism is disposed in the high pressure area. A cylinder block effectively separates the high and low pressure areas of the compressor. The lubrication system includes an axial passage for communication oil from a sump to various compressor components, including rotational bearings. A seal cap is disposed at the end of the crankshaft that extends into the high pressure area and in combination with the cylinder block defines an oil discharge chamber at low pressure and isolated from the high pressure area.

Abstract: A pump for providing a pressurized fluid flow. The pump includes a pump casing that defines a pump chamber. A pump shaft is has a head end in the pump chamber; the head end has a circumferential outer surface. The pump shaft head end has inwardly extending piston chambers. A discharge manifold is formed in the pump shaft head end. The discharge manifold has one end in fluid communication with the piston chambers and a second end in fluid communication with a discharge conduit that extends outside of the pump casing. A piston is mounted in each piston chamber. The pistons are formed with flow-through bores that provide fluid communication between the pump chamber and the piston chambers. A suction valve associated with each piston regulates fluid flow from the pump chamber through the flow-through bore into the associated piston chamber. Discharge valves regulate fluid flow from each piston chamber into the discharge manifold.

Abstract: A hollow through-bolt is threaded internally and externally, at one end, to receive therein a reciprocable, end-threaded rod. A pair of fluid-control valves, centrally bored, are mounted on the through-bolt in spaced apart disposition. The other end of the through-bolt has a shoulder formed thereon for seating one of the valves thereagainst, and the other valve central bore is tapped for threaded engagement with the one end of the through-bolt. A sleeve, slidably engaged with the through-bolt, and interposed between the valves, maintains the one valve positioned against the shoulder.

Abstract: An actuator pump has one or more colinear piston cylinders (2, 3, 25) in a cylinder housing (1) in which change of volume is provided by reciprocative relationship of colinear pistons (4, 5, 23, 24,) in the colinear piston cylinders. One or more travel guides (6, 8) in sliding contact with guide cylinders (7, 9) in the cylinder housing are parallel to the travel guides. The colinear pistons and travel guides are attached to pump bases (10, 11) at opposite ends of the travel guides. Inward-pressured rings (14, 26), outward-pressured rings (29), fluid conveyances (16, 19, 30, 31), valves (36) and attachment components (21) for reciprocative actuation are provided selectively for particular design requirements.

Abstract: A pump for a vehicle braking or traction control system integrated into a hydraulic control unit. The housing for the hydraulic control unit has at least one counterbore in which a cylindrical sleeve is disposed. The cylindrical sleeve has a counterbore which is open at one end and closed at the other. A piston is reciprocal in the counterbore by a motor driven cam. The piston, in conjunction with the closed end of the sleeve, forms a pumping chamber having an outlet port provided through the closed end of the sleeve. Low pressure brake fluid is received into the pumping chamber through an axial fluid passageway and a one-way check valve. A piston support land is provided on the internal surface of the cylindrical sleeve and a mating opposing land is provided on the external surface of the piston. The opposing land has a plurality of equally spaced annular grooves which entrap sufficient fluid to provide a uniform fluid film between the piston support and opposing lands.

Abstract: A manually operable vacuum pump having a housing including first and second pump chambers whose volume is altered by movement of a displaceable piston which is moved by means of a piston rod attached thereto and fed through one of the first and second pump chambers. The first and second pump chambers are configured such that gas which is fed into the vacuum pump is compressed in two steps, primarily in the first pump chamber and secondarily in the second pump chamber to provide a suitable endvacuum. Thereafter, the gas is expelled from the second pump chamber through the second end cap.

Abstract: A pair of oppositely directed pistons are reciprocatingly mounted in a cylinder. The cylinder is formed unilaterally with and encapsulated within a tank for receiving compressed air and has an exhaust port at each end and a valve for controlling the flow of air into the tank. Each piston has a head with an aperture and a unidirectional valve for controlling air flow into the cylinder. An air inlet to the cylinder is located between the piston heads. A motor has a drive shaft extending through the air inlet and a transmission connected to the pistons drives the pistons synchronously in opposing, reciprocating strokes.

Abstract: A radial piston pump is described with dual pistons which are slidingly accommodated within a bushing coupled end to end to a valve body. Automatically controlled suction and discharge valves for a pressure chamber are arranged one behind the other in the longitudinal axis of the pump. The pistons are sealed by means of elastomeric seals compressed by an end of the valve body and bushing under pressure of a threaded sealing plug installed in the pump housing. The valves, valve body and bushing form a cartridge separately assembled and installed as a unit in the housing. The threaded sealing plug is formed with a damping chamber for damping of pressure pulsations.

Abstract: The compressor has a straight cylinder wholly confined within which are inlet valves, and reciprocatable discharge valves. One inlet valve is set in place by a centerbolt which can be turned by a wrench (or the like) to move the inlet valve to selected positions relative to its confronting discharge valve, whereby the volume of the clearance pocket is varied. The centerbolt mounted inlet valve, then, comprises an instrument for selectively varying the clearance pocket volume, obviating any need for any special clearance pocket varying devices or components.

Abstract: The invention is directed to improving the performance of a reciprocating piston pump in terms of noise. The reciprocating piston pump has a drive shaft, which has a circular cylindrical swash member, which is set at an acute angle (.beta.) to the longitudinal axis (O) of a pump and has a circumferentially disposed roller bearing ring. A pump piston, with its end face embodied as part of a spherical surface, engages the circumferential face of the roller bearing ring of the swash member. The longitudinal axes (O, P) of the drive shaft and pump piston extend in the same plane and intersect at right angles. The longitudinal axis (O, T) of the drive shaft and swash member are also offset from one another. Because of this configuration, a pumping phase that is considerably longer than the intake phase during one pumping cycle is attained. Changes in pressure andd force therefore proceed more slowly in the lengthened pumping phase, which improves the noise performance of the reciprocating piston pump.

Abstract: A hermetically sealed scotch yoke compressor assembly is disclosed wherein a crankcase includes annular channels formed on the top and bottom surfaces thereof defining muffling chambers. Gas refrigerant compressed within radially disposed cylinders into cylinder head covers is channeled into the upper annular muffler chamber and them through passages extending through the crankcase into the lower muffling chamber. An annular cover plate for covering the bottom annular channel is attached to the crankcase at its radially inner extreme and is biased against the crankcase at its radially outer extreme. Spacers between the cover plate and the crankcase provide an annular discharge opening directing discharge gas onto the motor windings.

Abstract: The present disclosure is directed to a water/air pumping system comprising essentially a substantially flat primary reservoir, a header tank and a pump. At least one reciprocating piston is powered through the tank. Eccentric drive cams are directly connected to the motor driven shaft and are connected to drive the pistons to pump water or air from the reservoir into the tank. A water and or air supply connection is horizontally connected to the reservoir and is provided with a water/air control valve proximate the reservoir. A tank discharge connector is connected to a water or air service system through the side wall of the tank externally thereof, above the motor driven shaft and its direct drive connection with the pistons for lubricating the driving mechanism. An air inlet valve is situated in the external wall of the primary reservoir beneath the piston intake so that the pump may pump either air or water.

Abstract: Disclosed herein is a combined fuel and oil pump comprising a reciprocally movable member for pumping fuel in response to member reciprocation, a reciprocally movable element for pumping oil in response to element reciprocation, and a fluid pressure actuated motor connected to the member and to the element and responsive to a source of alternating relatively high and low pressures for effecting reciprocation of the member and the element at a frequency less than the frequency of the alternation of the relatively high and low pressures.

Abstract: A fluid pump having manually operable and power operable sections 10a, 10b mounted within a unitary pump body 12 that defines at least one suction and one discharge port 14, 16. The manually operated section comprises a body section 12a defining a bore 20a that slidably supports a piston 24 for reciprocating motion that includes a piston rod 24a that extends outside of the body section and is operatively connected to an actuatable arm 60 pivotally atttached to the pump body. Flow passages 34, 42 including a check valve 32 communicate the suction port 14 with one portion 20a of the piston bore; another flow passage 49 communicates a discharge side 20b of the piston bore with the discharge port. The power operable pump section comprises another pump body section 12b that defines a pair of axially aligned bores 82 that slidably support pistons 80 and an eccentric 84 including a drive shaft 130 rotatably mounted within the pump body disposed intermediate and operatively engageable with the pistons.