Abstract: A diagonal ventilating fan (30) has a fan housing (36) and a fan wheel (80), rotatable around a rotation axis, that has associated with it an electric motor (73) to drive it, the fan wheel (80) extending in the direction of the rotation axis between an air inlet side and an air outlet side of the diagonal ventilating fan (30) and serving, as it rotates, to convey air in a main delivery direction from the air inlet side to the air outlet side. The fan wheel (80) has a preferred rotation direction so that, during operation, its blades (82) each have a front side and a back side, and a negative-pressure zone (110) occurs, during operation, adjacent each respective back side of a blade (82). An auxiliary cooling air blower (76) connects to the respective zones (110) to provide an improved flow of cooling air for the electric motor (73).

Abstract: The present invention discloses structure improvement of a canned motor pump, and more particular to a canned motor pump which is a plastic pump or a pump with plastic lining to transfer chemical liquids, wherein a support structure of a rotor system is improved to provide a high-rigidity cantilever stationary shaft to satisfy all kinds of requirements.

Abstract: A temperature control system for an electrical machine and a method of operating the system is provided. The machine includes a housing enclosing a motor and a compressor, the housing includes a suction pipeline in flow communication with the compressor. The suction pipeline is configured to channel fluid into the housing. A temperature control system assembly includes a fluid mover coupled to at least one of the rotor shaft and the compressor shaft and in flow communication with the suction pipeline upstream from the compressor. The fluid mover is configured to channel the fluid from the suction pipeline and across at least one of the motor and the compressor. Temperature control system includes a distribution header coupled to the housing and in flow communication with the fluid mover, the distribution header includes a first outlet coupled in flow communication to the motor to channel the fluid across the motor.

Abstract: An example fan assembly impeller moves air along a secondary flow path when driven by a motor. The motor also drives a fan rotor to move air along a primary flow path of the fan assembly. Air moving along the primary flow path moves in a first direction. Air moving along the secondary flow path moves in a second direction opposite the first direction. An example fan shroud communicates air used to cool a motor into a primary flow path of a fan assembly. The shroud communicates the air into the primary flow path so that the flow of air is at least partially aligned with air moving through the primary flow path of the fan assembly.

Abstract: A rotating system includes a drive member and a driven member. The rotating system includes a coupling positioned to rotatably couple the drive member to the driven member and a housing surrounding a portion of the coupling to define an inside and an outside, the housing having a plurality of apertures. A fan is coupled to the coupling and operable to produce a flow of air from the inside to the outside via at least one of the plurality of apertures, and a guide tube is positioned within one of the plurality of apertures to guide a flow of air from the outside to the inside.

Abstract: A submersible motor pump includes a water jacket having a circulation passage of a coolant, a centrifugal impeller for circulating the coolant, a suction passage configured to provide fluid communication between the circulation passage and a fluid inlet of the centrifugal impeller, and a discharge passage configured to provide fluid communication between a fluid outlet of the centrifugal impeller and the circulation passage. The discharge passage includes a heat-exchange passage formed by two wall surfaces, one of which is constituted by a member which contacts a liquid conveyed by a main impeller. The heat-exchange passage has a circular shape extending radially outwardly from the fluid outlet of the centrifugal impeller. The heat-exchange passage includes at least one axial passage section having a length component in an axial direction of the rotational shaft.

Abstract: Apparatus and methods are provided for cooling motors used to drive gas and air compressors. In particular, the cooling of hermetic and semi-hermetic motors is accomplished by a gas sweep using a gas source located in the low-pressure side of a gas compression circuit. The gas sweep is provided by the creation of a pressure reduction at the compressor inlet sufficient to draw uncompressed gas through a motor housing, across the motor, and out of the housing for return to the suction assembly. The pressure reduction is created by means provided in the suction assembly, such as a nozzle and gap assembly, or alternatively a venturi, located upstream of the compressor inlet. Additional motor cooling can be provided by circulating liquid or another cooling fluid through a cooling jacket in the motor housing portion adjacent the motor.

Abstract: A vacuum pump for producing low or high vacuum has a housing having a gas inlet and a gas outlet, a pumping system located in the housing, a motor for driving the pumping system, and a control electronics for controlling operation of the pump and likewise located in the housing, with the pumping system and the control electronics being located in separate housing sections of the housing.

Abstract: An axial-flow fan for a vehicle radiator includes a fan wheel that delivers the main air flow and is driven by a hub motor coupled to the fan wheel. The vehicle radiator is on the intake side of the fan wheel, the hub motor during operation is cooled by a secondary air flow, and the cooling air flow of the hub motor flowing out from an air outlet opening is on the intake side in the hub area of the fan wheel. An air baffle device including a propeller is assigned to the hub motor and the cooling air flow passing through the air baffle device is led out of the air outlet opening, avoiding disturbances of the main air flow delivered by the fan wheel.

Abstract: A sealed compressor includes a housing for receiving a compressor pump unit and an electric motor. The electric motor drives a driveshaft. The driveshaft extends to drive an element within the compressor pump unit to compress a fluid. The motor includes a rotor spaced from a portion of the housing by a gap. The driveshaft drives a counterweight, which has a radially outermost portion extending radially outwardly beyond a radially innermost portion of the stator. The radially outermost portion of the counterweight has an angled face to drive fluid into the gap.

Abstract: Certain exemplary embodiments can comprise a system, which can comprise an electric motor cooling fan. The electric motor cooling fan can be driven by an auxiliary motor distinct from an electric motor adapted to be cooled by the electric motor cooling fan. The system can comprise a motor enclosure of the electric motor. The motor enclosure can be configured in a predetermined ventilation pattern.

Abstract: An electric motor comprising a stator of the type having polar expansions of the wound type, a rotor chamber defined by a sealed case, closed by a sealing ring, a permanent magnet rotor, housed inside the rotor chamber and a shaft connected to the rotor. The electric motor comprises a valve which allows outflow of fluid from said rotor chamber; the valve is formed by a through bore provided on the sealing ring and an opposing wall for closing the bore; the wall is provided in a wall of a sealing ring holding disc which is form coupled to the sealing ring.

Abstract: A compressor unit is provided. The compressor unit includes a compressor and a motor enclosed by a common casing in a sealless manner. A stator of the motor is cooled by a cooling system. A partition separates a process fluid from a cooling fluid in an area of the stator. Further, a relation between a process fluid pressure and a cooling fluid pressure is established by using a pressure compensator.

Abstract: A pump has a body and a pressurizing barrel. The body has an outlet tube and a magnetic check valve mounted in the outlet tube to prevent a back-flow current from damaging an impeller mounted inside the body. When closed, the magnetic check valve actuates a magnetic switch to signal external devices. The pressurizing barrel has a tank containing liquid for compensating a pressure in the body and a casing. The casing is externally mounted on the pressurizing barrel, defines a notch for receiving a circuit board and has a detachable cap to facilitate maintenance of the circuit board. Accordingly, the pump effectively prevents impeller and motor damage due to the back-flow current. Moreover, the casing facilitates maintenance of the circuit board.

Abstract: Apparatus and methods are provided for cooling motors used to drive gas and air compressors. In particular, the cooling of hermetic and semi-hermetic motors is accomplished by a gas sweep using a gas source located in the low-pressure side of a gas compression circuit. The gas sweep is provided by the creation of a pressure reduction at the compressor inlet sufficient to draw uncompressed gas through a motor housing, across the motor, and out of the housing for return to the suction assembly. The pressure reduction is created by structure in the suction assembly, such as a nozzle and gap assembly, or alternatively a venturi, located upstream of the compressor inlet. Additional motor cooling can be provided by circulating liquid or another cooling fluid through a cooling jacket in the motor housing portion adjacent the motor.

Abstract: A cooling fan (1) for a motor vehicle has a fan wheel (4) and a brushless fan motor (2) which is used to drive the fan wheel (4). The fan motor (2) has an internal rotor (3). The fan wheel (4) is directly connected to the internal rotor (3) in order to reduce the size of the type of cooling fan (1) whilst retaining the power output.

Abstract: An electric compressor includes a shaft with a forward leading groove and a reverse leading groove both engraved on its outer wall. When a motor rotates forward, the forward leading groove pumps up lubricant through a centrifugal pump thereby lubricating sliding sections of the compressor. The reverse leading groove has a lead directing opposite to that of the forward leading groove, and when the motor rotates reversely due to some reason, the reverse leading groove pumps up the lubricant through the centrifugal pump thereby lubricating the sliding sections.

Abstract: To improve a compressor for refrigerant, comprising an outer casing, a scroll compressor disposed in the outer casing, a drive unit, disposed in the outer casing, for the second compressor body, having an eccentric drive, a drive shaft running in lying arrangement or approximately horizontally in the outer casing and a drive motor, which includes a stator and a rotor seated on the drive shaft, as well as a lubricant supply, in such a manner that the minimum possible quantity of lubricant is required, it is proposed that a lubricant collection space is disposed in the outer casing, that the lubricant supply has a delivery wheel which delivers lubricant from a delivery sump into a feed space for the drive shaft, and that a lower pressure prevails in a lubricant delivery space accommodating the delivery sump than in the lubricant collection space, so that the lubricant which collects in the lubricant space, on account of the pressure difference, passes into the delivery sump.

Abstract: An air-cooled electric motor is provided, which may be used in a compressor assembly, including a motor unit with a motor housing out of which a drive shaft extends, such that the drive shaft drives a ventilator, the ventilator includes at least two radially and/or axially separated ventilator sections to propel a first airstream as well as at least one other, second airstream that is separate from the first airstream, such that the airstreams are conducted separately on both the inflow side of the ventilator and the outflow side of the ventilator.

Abstract: The invention concerns a dual pump, comprising an electric motor (18) including a drive shaft, the shaft including, at each of its axial ends, a shaft output (21, 22), and two pump impellers, each shaft output driving a respective pump impeller, one first of the pump impellers (23) operating at low pressure and high flow rate, and the second of the pump impellers (30) operating at higher pressure and lower flow rate. The water pumped by the second pump impeller (30) is drawn proximate the outlet of the first pump impeller (23) and returns to the inlet of the second pump impeller. The drawing point is situated in a low pressure pump chamber, upstream of the low pressure outlet (16). The invention is applicable to swimming pool maintenance.

Abstract: A computer system comprises a chassis, an electronic component disposed within the chassis, and a cooling fan that comprises a motor support fixed to a housing that is coupled to the chassis and a hub disposed within the housing. A plurality of blades extend radially from the hub. A motor is disposed within a motor enclosure formed by the motor support and the hub. The hub is rotatably coupled to the motor such that the plurality of blades generates a flow of air around the motor enclosure. The system comprises a motor cooler comprising a flow path through the motor enclosure, where the flow path has a first opening and a second opening, and where the second opening is disposed within an area of lowered downstream pressure so as to develop a differential pressure between the first and second openings and generate a flow of air through the motor enclosure.

Abstract: A reciprocating compressor includes a compressing unit placed over a motor unit. A crankshaft, which converts rotating action of the motor unit into reciprocating action of a piston of the compressing unit, has (a) a centrifugal pump provided at a lower section of the crankshaft, and (b) a pair of spiral pumps that communicate with the centrifugal pump and have leading grooves running in opposite directions to each other. The crankshaft also includes a pair of eccentric paths at its upper section. The eccentric paths open into an enclosed container and communicate with the spiral pumps respectively. This structure allows production of greater force for transferring lubricant oil regardless of the rotating direction of the crankshaft.

Abstract: The present invention obtains a desired cooling effect in a fan motor as well as suppresses any increase in the noise level in a centrifugal fan that sucks in air from the rotary shaft direction and blows out air in a direction that intersects the rotary shaft, and in an air conditioner provided therewith. The centrifugal fan of the air conditioner comprises a fan motor, a hub, a plurality of blades, and an air guide. The hub has cooling air holes, and is coupled to and rotationally driven by a shaft of the fan motor. The air guide guides a portion of the blown out air to the vicinity of the fan motor, cools the fan motor, and then guides the air flow so that the revolving direction velocity decreases when that air is blown out from the cooling air holes to the side of the hub opposite the fan motor.

Abstract: The present invention provides an automotive engine-cooling fan assembly including a motor having a driveshaft defining a central axis, and a fan driven by the motor. The fan includes an inner hub portion coupled to the driveshaft, and an outer hub portion coupled to the inner hub portion. The outer hub portion is coupled to a plurality of radially-extending blades. The fan also includes a plurality of vibration isolation members interconnecting the inner hub portion and the outer hub portion.

Abstract: An electric motor-driven scroll compressor as a fluid machine includes a housing (10) containing a scroll unit (20) and an armature (38) for driving the scroll unit (20), and a refrigerant conduit located inside the housing (10) to guide a refrigerant toward the scroll unit (20). The refrigerant conduit includes a helical groove (64) as part thereof. The helical groove (64) is formed in the outer peripheral surface of a rotor (54) constituting the armature (38) and has opposite ends opening in the respective opposite end faces of the rotor (54).

Abstract: A rotating system includes a drive member and a driven member. The rotating system includes a coupling positioned to rotatably couple the drive member to the driven member and a housing surrounding a portion of the coupling to define an inside and an outside, the housing having a plurality of apertures. A fan is coupled to the coupling and operable to produce a flow of air from the inside to the outside via at least one of the plurality of apertures, and a guide tube is positioned within one of the plurality of apertures to guide a flow of air from the outside to the inside.

Abstract: A hermetic compressor includes a hermetic container, a compression element accommodated in the hermetic container, and a motor element driving the compression element. The hermetic container has an inner space therein arranged to store lubrication oil. The compression element includes a shaft unit rotating about a rotation axis. The shaft unit has an oil-feeding passage provided therein. The oil-feeding passage extends upward from a lower end of the shaft unit. The shaft unit has an oil-spattering hole provided therein. The oil-spattering hole extends substantially perpendicularly to the rotation axis. The oil-spattering hole has a first open end communicating with the oil-feeding passage and a second open end opening in the inner space of the hermetic container. The second open end has a cross-sectional area smaller than a cross-sectional area of the first open end.

Abstract: An electrical machine to facilitate transporting fluids through a pipeline is provided. The machine includes a stator, a rotor magnetically coupled to the stator, and a housing enclosing the rotor and the stator. The housing includes a wall that facilitates channeling a first fluid at a first pressure through a portion of the housing. The machine also includes a stator enclosure defined by at least one wall that facilitates maintaining a second fluid within the stator enclosure. The stator enclosure is positioned within the electric machine housing. The stator enclosure has at least one wall that substantially isolates the second fluid from the first fluid such that only the second fluid is in flow communication with the stator. The stator enclosure has at least one wall that facilitates heat transfer from the second fluid to the first fluid. At least a portion of at least one of the stator enclosure walls is configured to facilitate equalizing the first pressure and the second pressure.

Abstract: A multi-cylinder dry-running piston compressor for generating compressed air. The piston compressor includes a crankcase having an interior and a crankshaft rotatably mounted in the crankcase. Also included are two connecting rods mounted in the crankshaft and configured to run counter to one another. Further included are two cylinders mounted in the crankcase and a piston arranged at an end of each of the connecting rods and configured to run in a respective one of the two cylinders.

Abstract: The unit (1) comprises a positive-displacement compressor (2) including: a prime mover (4), a rotatable shaft (5) rotatable by the prime mover (4), and at least one cylinder (7-10) in which an associated piston (11, 12), coupled to the shaft (5) by means of a crank mechanism (13, 14), is mounted for sliding in a leaktight manner; and a heat-exchanger unit (3) for receiving and cooling the compressed fluid produced by the compressor (2). The unit comprises at least one tapping duct (41; 41a, 41b) extending between the heat-exchanger unit (3) and that region of the at least one cylinder (7-10) which is disposed between the associated piston and the shaft (5), the duct being suitable for supplying a flow of compressed fluid to that region in operation in a manner such that the flow of fluid can expand and be cooled further in that region.

Abstract: A pumping apparatus for pumping a liquid from a source to a target including a motor, a first pump driven by the motor, a second pump driven by the motor and a separator in fluid communication with the first and second pump for separating a liquid received from a source into a gaseous component and a liquid component. The separator further diverts the gaseous component to the first pump and the liquid component to the second pump, wherein the first pump pumps the gaseous component back to the source and the second pump pumps the liquid component to a target.

Abstract: A fuel pump (10) supplying fuel to an internal combustion engine includes an electric motor (14), a shaft (16) driven by the motor, and a pump assembly (18) including a pumping element (20) mounted on the shaft. A fuel pump improvement includes the shaft being a multi-sided shaft with the pumping element having a central opening (22) through which the shaft extends. This opening is a contoured opening having a plurality of sides (24a-24c) each of which is in contact with a side (22a-22c) of the shaft to distribute wear which occurs between the shaft and the pumping element. This construction prolongs the operating life of the pump. In a roller vane type pump having N vanes, the motor shaft has a number of sides S determined by the formula S=N±1, and N>3.

Abstract: A fluid pump of the type in which a housing assembly has a first sub-housing having an electric motor therein which is in line with a second sub-housing having the impeller therein, with the motor having a rotor shaft which extends through a seal of the first sub-housing into the second sub-housing and with the impeller mounted on the rotor shaft so as to be rotatable by the motor, and the second sub-housing having inlet and outlet ports through which fluid, such as water, is able to be pumped through the second sub-housing.

Abstract: An electrically powered axial-flow fan has a hub to house the motor and support the fan blades. Small blades or vanes on the inside of the hub function as a radial-flow blower to draw cooling air through cooling ports on the electric motor housing. The vanes inside the hub cooperate with a flange surrounding the motor to form a low pressure chamber under the hub to improve cooling flow through the motor. This motor cooling air flow is then ejected into the exhaust stream of the axial-flow fan.

Abstract: A screw-type vacuum pump (1) is tempered such that characteristics of the pump are not substantially altered when the pump is subjected to thermal stress. In order to achieve said aim, cooling is adjusted according to an operating state of the screw-type vacuum pump (1), preferably to maintain a substantially constant pump gap (4).

Abstract: A rotary machine cooling system is provided that includes a housing having an inlet and outlet. A rotor supported in the housing for rotation about an axis with the rotor including an outer surface. A stator is disposed within the housing about the rotor having an inner surface adjacent to the outer surface of the rotor. A gap is formed between the inner and outer surfaces sufficient to reduce friction and permit convection cooling. The gap is in fluid communication with the inlet and outlet, and a pumping device pumps a cooling gas from the inlet into the gap and through said outlet. The pumping device includes an impeller affixed to an end portion of the rotor to create an axial airflow into the gap. Preferably, the present invention air cooling system is used in conjunction with a liquid cooling system arranged exteriorly to the stator. The liquid cooling system reduces the amount of air needed to flow between the gap to remove the desired amount of heat from the machine.

Abstract: The present invention is a printed circuit board having cooling means incorporated therein, which is coordinated with a fan. The fan comprises a frame, a stator, a rotator and a circuit board. The circuit board comprises at least one electronic component, a control IC and a heat discharge region. The heat discharge region comprises two heat dissipation areas with a plurality of holes; and the control IC is at a position corresponding to the heat discharge region. Accordingly, the circuit board can be ventilated and its heat-transfer structure can be destroyed to further obtain a better heat discharge so that the work efficiency of the control IC can be improved.

Abstract: The present invention provides a high-pressure blower comprising a fan arrangement which includes a fan, and a fan housing for conveying working air. An electromotor drives the fan via a motor shaft to provide motor self-ventilation by generating a cooling air stream flowing through the motor due to a cooling wheel driven by the rotor. A wall section separates the interior space of the fan housing accommodating the fan airtight from the interior space of the blower accommodating the electromotor so that the cooling air stream flowing through the electromotor is separated and independent of the air flow of the working air conveyed to the fan.

Abstract: A method of draining and recharging a hermetic compressor with oil using a drainage assembly mounted in the compressor housing. The assembly includes a tube having a valve mounted at one end thereof with the second end of the tube located in the oil sump of the housing. To drain the compressor oil, refrigerant flowing through the discharge and suction lines is shut off. Refrigerant is purged from the housing to create a vacuum therein and the housing is charged with a gas such as dry air or nitrogen. As the compressor housing is charged with gas, the pressure inside the housing increases, forcing the oil through the drainage assembly and out of the compressor. To recharge the compressor with oil, the gases are purged creating a vacuum in the housing. A predetermined amount of oil is drawn into the housing through a service hose. The compressor is purged and recharged with refrigerant.

Abstract: A rotor capable of dissipating heat comprises a hub and a shielding received in the hub. The shielding case has an upper wall with a plurality of projection parts. The projection parts have a side thereof attached to the upper wall respectively and a plurality of openings are disposed in the upper wall at the projection parts. The hub has an upper hub wall with a plurality of through holes. The fluid can move in and out via the openings and the trough holes to perform heat dissipation.

Abstract: An air compressor includes a valve plate with cooling fins and a piston also having cooling fins. The valve plate includes an integral and angled valve plate outlet. The angling of the valve plate outlet reduces turbulence and improves compressed air flow. The pump frame of the gas compressor includes a lipless bearing bore, decreasing the distance between the portion of the frame supporting the bearing and the piston. The pump frame is flat such that a portion of the cylinder is over a portion of the motor. The flatness of this arrangement increases the strength of the pump frame. The piston bearing bore includes two clamping structures having screw holes. Each screw hole is formed from a series half-cylinder or barrel portions, which individually do not form the complete circumference of a hole. Such a screw hole does not require a core pull on casting, lowering manufacturing costs. The piston includes a piston seal which is angled with respect to the piston.

Abstract: A blower unit includes a housing, a shroud, a motor, a feed air impeller, a fan casing and a cooling air impeller. A motor shaft extends from both ends of the motor. The feed air impeller is attached to a front of the motor and the cooling air impeller is attached to a rear of the motor. The feed air impeller is contained in the fan casing. The shroud retains the motor and forms a guide chamber around the fan casing. The shroud is retained in the housing. Air is drawn through a front of the housing by the cooling air impeller. The air flows between the motor and the shroud and out of a bottom of the housing. Air is drawn by the feed air impeller and forced through the plurality of apertures in the fan casing and through a housing outlet by the feed air impeller.

Abstract: A cooling fan with dual blade sets has an impeller formed by a rotatable hub, a stator assembly, and a shell. A plurality of mini blades and a plurality of guide blades are respectively formed on a bottom surface and an external surface of the rotatable hub. The impeller has a plurality of holes defined on the bottom surface being arranged in a circle adjacent to the mini blades. Therefore when the impeller rotates, the mini blades are able to drive out the heat in an inner space between the impeller and the shell through the holes to outside.

Abstract: A hydrogen blower is provided and includes a housing having a drive unit and a compressor unit disposed therein. The drive unit is separated from the compressor unit by a neutral chamber, whereby the neutral chamber effectively seals the drive unit from the compressor unit. The drive unit includes a drive shaft, whereby the drive shaft extends generally between the drive unit and the compressor unit to selectively drive the compressor. In addition, the drive shaft fixedly supports a series of fan blades such that rotation of the drive shaft imparts a pressure on the neutral chamber to effectively seal the drive unit from the compressor unit. In this manner, the drive motor, compressor, and drive shaft may be packaged in a single housing while effectively sealing the drive unit from the compressor unit through cooperation between the fan blades and the neutral chamber.

Abstract: An air compressor having a cooling fan that cools both a pump and an electric motor. Baffle compress air against the top of the motor, causing it to break up and flow around fours sides of the motor and through the motor. The pump includes an elongate intake tube or muffler that attenuates pump intake noise. A compressor tank for the air compressor includes a roll cage for protecting a condensate valve for the compressor tank. The compressor tank includes a rim base formed on the bottom of the compressor tank that permits the compressor tank to rest on a surface without additional supports or legs. Controls and gauges are mounted in the bottom clamshell piece, and openings on a top fit around the controls and gauges. The top and the bottom are aligned with guides so that the controls and gauges may be properly aligned with the openings.

Abstract: A heat-dissipating device is provided for generating primary airflow to dissipate heat generated by external heat sources as well as secondary airflow to dissipate heat generated from the interior of the heat-dissipating device. The heat-dissipating device includes a primary fan and a secondary fan coupled with a shaft of the primary fan. The secondary fan is rotated along the shaft to generate the secondary airflow and dissipate heat generated by the heat-dissipating device per se. Thus, the operation temperature of the heat-dissipating device can be lowered to increase its life span.

Abstract: An air compressor includes a valve plate with cooling fins and a piston also having cooling fins. The valve plate includes an integral and angled valve plate outlet. The angling of the valve plate outlet reduces turbulence and improves compressed air flow. The pump frame of the gas compressor includes a lipless bearing bore, decreasing the distance between the portion of the frame supporting the bearing and the piston. The pump frame is flat such that a portion of the cylinder is over a portion of the motor. The flatness of this arrangement increases the strength of the pump frame. The piston bearing bore includes two clamping structures having screw holes. Each screw hole is formed from a series half-cylinder or barrel portions, which individually do not form the complete circumference of a hole. Such a screw hole does not require a core pull on casting, lowering manufacturing costs. The piston includes a piston seal which is angled with respect to the piston.

Abstract: An air compressor includes a valve plate with cooling fins and a piston also having cooling fins. The valve plate includes an integral and angled valve plate outlet. The angling of the valve plate outlet reduces turbulence and improves compressed air flow. The pump frame of the gas compressor includes a lipless bearing bore, decreasing the distance between the portion of the frame supporting the bearing and the piston. The pump frame is flat such that a portion of the cylinder is over a portion of the motor. The flatness of this arrangement increases the strength of the pump frame. The piston bearing bore includes two clamping structures having screw holes. Each screw hole is formed from a series half-cylinder or barrel portions, which individually do not form the complete circumference of a hole. Such a screw hole does not require a core pull on casting, lowering manufacturing costs. The piston includes a piston seal which is angled with respect to the piston.

Abstract: The invention generally concerns a submersible well pumping system comprising an axially elongated housing and a multi-chamber hydraulically driven diaphragm pump suspended in a well. The pump is driven by a self-contained, closed hydraulic system, activated by an electric, pneumatic or hydraulic motor. Several embodiments are used to reverse the flow of working fluid into and out of the working fluid sub-chambers of a two chambered diaphragm pump to operate the diaphragm pump over all operating conditions including starts and stops, and low speed. Generally, the embodiments sense the end of the pumping stroke, either directly or by time. When the end of the pumping stroke is sensed, the direction of flow is reversed by changing the state of a directional valve, operating a reversing clutch, or by deactivating one prime mover-auxiliary pump and activating a second that operates in the reverse direction.

Abstract: A motor-driven compressor for compressing a refrigerant in an air conditioning system includes an electric motor, a swash plate-type compression unit driven by the electric motor, and a cooling channel for returning the refrigerant used by the air conditioning system to a suction chamber of the compression unit. The cooling channel has an upstream section including an armature chamber of the electric motor, and a downstream section extending from the armature chamber to the suction chamber in such a manner that the downstream section is separated from a crank chamber of the compression unit.