Abstract: A piezoelectric pump for pumping a fluid at a high flow rate includes a housing and an actuator located within the housing. An electric voltage applied to the actuator causes the actuator to apply a force to a first diaphragm that is proximate to the actuator. A piston assembly is located within the housing and is moveable between at least a first position and a second position. A first fluid chamber is defined by the housing, the first diaphragm, and the piston assembly. A coupling fluid is located within the first fluid chamber for coupling the first diaphragm to the piston assembly. A second fluid chamber is defined by the housing and the piston assembly. An inlet valve is in communication with the second fluid chamber and an outlet valve is in communication with the second fluid chamber.

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: In at least some embodiments, a pump includes a turning member and a reciprocating member coupled to the turning member, the reciprocating member performing a pumping motion as the turning member turns. The pump also includes at least one stabilization component in contact with the reciprocating member to stabilize the pumping motion.

Abstract: A pump apparatus that produces a pumping action for a gas or a liquid is produced in an extremely small and slim form and can be favorably used as a cooling pump apparatus for an electronic appliance or the like. There is provided an electromagnetic pump where a plunger 10 including a magnetic body is provided so as to be capable of sliding inside a cylinder that is sealed at both end surfaces thereof by a pair of frames 20a, 20b with spaces between the plunger 10 and the end surfaces of the respective frames 20a, 20b as pump chambers 30a, 30b, air-core electromagnetic coils 50a, 50b are disposed around an outer circumference of the cylinder, and a fluid is conveyed by passing a current through the electromagnetic coils 50a, 50b to reciprocally move the plunger 10 in an axial direction of the cylinder, wherein intake valves 34a, 34b and outflow valves 36a, 36b that connect the pump chambers 30a, 30b and the outside are provided inside regions of the frames 20a, 20b at the end surfaces of the cylinder.

Abstract: The present invention provides an air compressor, characterized in that the piston head has a concave portion having a plurality of through holes therein and a reed piece having a smaller area than that of said concave portion is disposed in said concave portion, said reed piece having an opening in its center to allow a seizing member, respectively, which is seized on a top center of said piston head, for freely moving through said opening, and said seizing member having a confining portion to confine said reed piece within a predetermined space for moving so that said reed piece moves toward or away from said plurality of through holes by means of reciprocally moving said piston rod to improve the air compression efficiency while said air compressor is operating.

Abstract: A suction device (10) is described. The suction device (10) includes a cylinder (11) having a semi-closed end (113), a suction tip (13) connected to the semi-closed end (113), a piston (12), an elastic member (16) and an electromagnetic member (17). The piston (12) is slidably received in the cylinder (11), the piston (12) and the semi-closed end (113) encloses a working chamber (122). One end of the elastic member (16) is connected to the cylinder (11), the other end is connected to the piston (12). The electromagnetic member (17) causes the piston (12) to slide back and forth in the cylinder (11) to vary the volume of the working chamber (122) by adjusting the magnetic field of the electromagnetic member (17).

Abstract: A linear compressor (1) includes a cylinder (21) with a piston (22) connected through a main spring (19) and a planar spring (20). One or more flat blocks of permanent magnet material (17) with large faces of the blocks facing a stator (15) and defining armature poles are secured to a connecting rod (30). A lateral support (52) acts between the cylind (21) and the connecting rod (30) at a location midway between the permanent magnet material and the piston (22) allowing axial movement of the connecting rod (30) but transferring side loads to the cylinder (21).

Abstract: A hydraulic power unit that uses a quantity of media within a cavity adjacent to and surrounding a hydraulic assembly in the housing of the hydraulic power unit to reduce the overall noise of the unit. Additionally, the cavity either seals the media from the moving parts of the hydraulic assembly or isolates the media from the moving parts of the hydraulic assembly to ensure damage to the hydraulic assembly does not result.

Abstract: The pump unit according to the invention is formed by assembling a pump module (9) comprising a body having a cavity (10) forming a working chamber, a translationally mobile piston (15) engaging leaktightly in the cavity (10) via a seal (14), at least one channel (12, 13) formed in the body to connect the working chamber to a use circuit, a linear actuating module comprising an actuating member (3) that is translationally mobile coaxially with the piston (15), and a connecting and guiding module (18) for establishing a mechanical connection between the pump module (9) and the linear actuating module (2) and for precise guidance of the piston (15) coaxially with the seal.

Abstract: In a pneumatic brake system for a motor vehicle, a variable speed electric motor is connected to a high voltage direct current power supply for variable energization, thus varying the operating rate of a compressor and the rate of pressurization of the brake system storage tanks. The operating rate of the compressor is varied responsive to pressure readings taken from the storage tanks during pressurization to minimize energy consumption.

Abstract: A self-actuated cylinder comprising a cylinder housing comprising electro-magnetic force generating means to generate electro-magnetic forces, and a piston within the cylinder housing, wherein the electro-magnetic forces act directly on the piston to displace the piston within the cylinder housing. The self-actuated cylinder can be used as an oscillation spirometer to determine air flow, an input impedance or Forced Oscillation pulmonary mechanics.

Abstract: Disclosed is a structure for fixing a motor stator of a reciprocating compressor, the reciprocating compressor comprising: a frame unit mounted in a casing and elastically supported; a reciprocating motor including an outer stator coupled to the frame unit, an inner stator inserted into the outer stator, and a mover inserted between the outer stator and the inner stator; and a compression unit for compressing a refrigerant by receiving a linear-reciprocation driving force of the reciprocating motor, wherein the inner stator and the frame unit contacting the inner stator are coupled to each other by welding. According to this, the structure is simplified and a fabrication cost is reduced by facilitating a fabrication.

Abstract: A pump includes a housing with a pumping chamber, first and second check valves, and an inlet and an outlet in fluid communication with the pumping chamber through the check valves. The housing also includes a linear actuator with a pumping element located in the pumping chamber wherein actuation of the linear actuator induces the pumping element to move in the pumping chamber between the first and second check valves between a first position wherein the pump element moves toward the first check valve and generates a positive pressure in the pumping chamber with the positive pressure maintaining said first check valve closed and opening the second check valve to allow the fluid in the pumping chamber to flow to the outlet, and a second position wherein the pumping element moves away from the first check valve and reduces the pressure in the pumping chamber to allow the first check valve to open and draw in fluid from the inlet into the pumping chamber to thereby pump fluid from the pump.

Abstract: The evacuation device is configured to remove air from a container via a one-way valve element attached to the container. The evacuation device includes a motor with a rotating shaft that extends along an axis line. The shaft is operably interconnected to a reciprocating element reciprocally movable within a chamber along a direction parallel to the axis line. Reciprocal motion of the reciprocal element draws air into and exhausts air from the chamber. To facilitate the operable interconnection, the evacuation device includes a cam having a cylindrical sidewall mounted to the rotating shaft. Disposed circumferentially into the cylindrical sidewall is a channel. The evacuation device further includes a yoke connected to the reciprocal element and having a follower element received in the channel. Rotation of the cam causes the follower element to move with respect to the channel, thereby converting rotational motion to linear translation. The evacuation device may also include a pressure adjustment feature.

Abstract: A seal carrier is provided for an ultrahigh-pressure fluid system having a plunger configured to reciprocate therein along a longitudinal axis when the ultra-high pressure fluid system is in operation, the seal carrier having an inner surface provided with a first portion configured to captively receive a seal, substantially preventing displacement of the seal in a direction substantially parallel to the longitudinal axis, and a second portion configured to circumferentially surround a bearing. The seal carrier is further provided with an outer surface having a recess formed along at least a portion of a circumference thereof, the recess at least partially positioned opposite the first portion of the inner surface along a lateral axis substantially perpendicular to the longitudinal axis.

Abstract: Magnetic pumping systems and methods of pumping using such systems are disclosed. In one embodiment, a system for pumping fluid comprises: a substantially cylinder-shaped pump housing (200); a magnetic piston (210) residing within the pump housing (200) for displacing the fluid; a magnetic actuator (220) surrounding the pump housing (200), wherein the magnetic actuator (220) is configured to move the piston (210) by a magnetic force between the magnetic piston (210) and the magnetic actuator (220); and a magnetic ring (230) surrounding and attached to the magnetic actuator (220) for increasing a magnitude of the magnetic force.

Abstract: A pump element includes a pump element housing defining a pump chamber having an inlet and an outlet, and at least a first movable element movable in the pump chamber between a first and a second position. During a movement of the first movable element in the direction from the first to the second position, a flow resistance of a flow path from the first movable element through the inlet is larger than a flow resistance of a flow path between the pump element housing and the first movable element. During a movement of the first movable element in the direction from the second position to the first position, a flow resistance of a flow path from the first movable element through the outlet is smaller than a flow resistance of the flow path between the pump element housing and the first movable element. Thus, during a reciprocating movement of the first movable element between the first and the second position, a net flow through the outlet takes place.

Abstract: There is disclosed a compressor capable of easily adjusting top clearances in a case where metal gaskets are used as a seal material between a valve plate and a casing main body. In the compressor in which pistons reciprocate in cylinders of the casing main body constituting a casing to perform a compression work and which is constituted by fixing cylinder heads with bolts to the casing main body via the seal material and the valve plate, the seal material to be interposed between the valve plate and the casing body is constituted by superimposing a plurality of metal gaskets on one another.

Abstract: A fluid pump comprising a plurality of piston cylinders (1, 2, 3, 4), wherein each individual cylinder has a piston rod (5, 6, 7, 8) with a piston (9, 10, 11, 12) arranged in the cylinder and a valve housing (13, 14, 15, 16) mounted at the end of the cylinder opposite the piston rod, and a drive arrangement for the piston rods, said drive arrangement comprising two main gearwheels (17, 18) which mesh and rotate in opposite directions. The present fluid pump is characterized in that the reciprocating motion of the piston rods (5, 6, 7, 8), which extend in pairs in opposite directions, is effected with the aid of two beams (19, 20) that are fixed to the end of the respective pair of piston rods opposite the pistons (9, 10, 11, 12), and which extend at right angles relative to the piston rods, and that the beams are connected to the main gearwheels (17 18) by shaft pins (21, 22, 22, 23) which move in pairs in guides (24) provided in the longitudinal direction of the respective beam.

Abstract: A vibratory pumping machine including a pumping chamber disposed within a housing for the machine having an inlet tube that is insertable into a container having a liquid therein to withdraw the liquid from the container upon actuation of the pumping mechanism also located within the housing. The chamber includes an oscillating rod that engages a resilient outlet member to form a vacuum within the chamber which draws the liquid upwardly through the tube into the chamber for dispensing through the outlet member. A mechanism including the pumping chamber can be utilized to withdraw liquids from within container of various shapes and sizes, as well as to introduce other fluids, such as gases, into containers containing such liquids.

Abstract: An improved apparatus and method are provided, for pumping fluids, such as water and/or hydrocarbons, from a subterranean formation or reservoir, through use of a cranked rod pumping (CRP) apparatus for imparting reciprocating substantially vertical motion to a rod of a sucker-rod pump having a pump stroke. The CRP apparatus includes a motor driven cranked mechanical actuator arrangement. The cranked mechanical actuator arrangement includes a substantially vertically moveable member attached to the rod of the sucker-rod pump for imparting and controlling vertical motion of the rod of the sucker-rod pump. The actuator arrangement may include pneumatic counterbalancing.

Abstract: A thrust piston pump apparatus PM1 can be driven by an electric motor 110 and is provided with a pump housing 120, a reciprocating piston 130 assembled into the pump housing 120, and a motion conversion mechanism 40 provided between the reciprocating piston 130 and a rotor 113 of the electric motor 110. In the electric motor 110, a tubular rotor 113 is disposed in a stator (magnet 112), and a cylinder portion 121A of the pump housing 120 is coaxially housed in the rotor 113. The reciprocating piston 130 is assembled into the cylinder portion 121? of the pump housing 120 in such a manner as to be able to reciprocate along a cylinder axis. The motion conversion mechanism 140 converts a rotary motion of the rotor 113 of the electric motor 110 in relation to the pump housing 120 and the reciprocating piston 130 to a reciprocating motion of the reciprocating piston 130.

Abstract: An apparatus for pumping fluids from a geologic formation comprising a submersible motor having a motor shaft, wherein said submersible motor is reversible and has a plurality of speed settings; a pump housing connected to said submersible motor by a motor mount, wherein said pump housing has a lubricant contained therein; and a tube connected to said pump housing having a pump barrel disposed therein, wherein said pump barrel has an upper barrel connector that is connected to a standing valve; whereby a reciprocating motion by a ball nut applies said lubricant on a ball screw, and associated method of use.

Abstract: By adopting a construction in which a first balance weight is provided at the side end portion of the eccentric shaft portion of the auxiliary shaft portion and a second balance weight is provided at the side end portion of the eccentric shaft portion of the main shaft portion, it becomes possible to provide sufficient first balance weight and second balance weight, without spoiling the compact size of the compressor, thus enabling the reduction of noise and vibrations.

Abstract: A hybrid hydraulic-electric pumping unit (12) with downstroke energy recovery is disclosed which is operated in a conventional flow mode to supply hydraulic fluid to a hydraulic ram (26), and then is operated in a reverse flow mode to receive the hydraulic fluid from the hydraulic ram (26) and turn an electric motor (16) to generate electric power. A single hydraulic hose (48) connects the pump (18) to the hydraulic ram (26), and is used for both passing the hydraulic fluid from the pump (18) to the hydraulic ram (26) and from the ram (26) to the pump (18). The potential energy of the weight of sucker rods (10) lifted in operating the pumping unit (12) is recovered by operating the pump (18) and motor (16) with return of the hydraulic fluid from the hydraulic ram (26) through the pump (18), which turns the motor (16) to generate electric power.

Abstract: A fluid compressor 10 comprising a stator 22, having a bore shaped first chamber 26 and an annular second chamber 30, and a piston 18 comprising a central piston rod 36 having a first piston head 44 and a concentrically arranged cylindrical piston sleeve 38 having a second piston head 48. The stator 22 and piston 18 together define a first compression chamber 12, a second compression chamber 14 provided concentrically around the first chamber 12, and a third compression chamber 16 provided concentrically around the first chamber 12 and linearly with the second chamber 14. The compression chambers 12, 14, 16 are interconnected via intercooling conduits 72, 74. A hydraulic actuator 20 is coupled to the piston 18 by a hydraulic ram 82. During left to right movement of the piston 18 fluid enters the third chamber 16 and fluid is compressed in the second chamber 14.

Abstract: A multi-channel pump includes a pump chamber, an inflow passage connected to the pump chamber, two or more outflow passages connected to the pump chamber, outflow side active valves provided so as to correspond to the outflow passages, and a movable body reciprocated to change a volumetric capacity of the pump chamber. The movable body may be a piston reciprocated within a cylinder that is connected to the pump chamber. A control method for a multi-channel pump includes an initial discharge step between a suction step and a discharge step. The multi-channel pump may be preferably utilized in a fuel cell.

Abstract: Piston assemblies for rocking piston compressors, diaphragm compressors and vacuum pumps are provided wherein the overall mass of each piston assembly is identical to that of the other assembly despite having rod tops, retainers and diaphragms of different diameters and therefore different capacities. Each piston assembly includes a connecting rod connected to a rod top that supports a cup seal and a retainer or retainer plate. The mass of each rod is equal to that of the other rod despite the differing geometries. The mass of each retainer is the same as that of the other retainer despite the differing geometries. The overall length and stroke length of each piston assembly is the same. As a result, centers of gravity of the piston assemblies are continuously balanced on either side of the drive shaft in terms of distance from the drive shaft and in absolute value.

Abstract: A short stroke piston pump for recovering oil and/or water from marginal stripper wells, tar sands and coal beds includes a motor connected to one end of a drive rod, the motor capable of moving the drive rod in a generally up and down direction. A piston is connected to another end of the drive rod, the piston and drive rod are disposed in a riser pipe, the piston is adapted to transport fluid up the riser pipe as the piston moves up and down in the riser pipe.

Abstract: An unlimited stroke drive method for pumping fluid from an oil well in which the well has a tubing string extending from the earth's surface down to a fluid producing formation. The method includes the steps of positioning a pump barrel within the tubing, an upper end of the pump barrel having communication through a standing valve with the interior of the tubing string, vertically reciprocating a length of flexible cable within the tubing string to vertically reciprocate a plunger within the pump barrel to allow a lower portion to quickly fill with fluid from the producing formation and then to a downward position in which fluid within the pump barrel lower portion is transferred through a traveling valve to an area within the pump barrel above the plunger to move formation fluid from within the pump barrel to the interior of the tubing and thence to the earth's surface.

Abstract: The invention relates to a reciprocating-piston pump having an electromagnetically driveable reciprocating piston, which is mounted with a restoring spring, for feeding a liquid, an impact damper composed of an elastomer for damping an impact of the reciprocating piston at the end of a feed phase, a core flange which is situated opposite the reciprocating piston, with a gap which is dependent on the position of the reciprocating piston being provided between the reciprocating piston and the core flange. Here, the invention is characterized in that the kinetic energy of the reciprocating piston during an early feed interval of a feed phase is absorbed primarily by the restoring spring and the feed of the liquid, and in that the kinetic energy of the reciprocating piston during a late feed interval of a feed phase is absorbed primarily by the hydraulic damping of the liquid present in the gap.

Abstract: A compact compressor comprising a first tubular housing portion; a second tubular housing portion having a first end region open to the first tubular housing portion and a second end region defining a compression chamber and housing a piston; an electric motor carried by the first tubular housing portion; a driving means connecting the piston to the electric motor; a valve plate seated against the second end region of the second tubular housing portion; and an end cover fixed to the second tubular housing portion and acting against the valve plate and providing, internally and through the valve plate, fluid communications between the compression chamber and the suction line and discharge line of a refrigeration circuit to which the compressor is coupled.

Abstract: A handheld device includes a casing having a cylinder presenting an opening for placement upon a user's skin. A motor is housed within the casing. A piston driven by the motor oscillates within the cylinder toward and away from the skin of a user to cause a pressure fluctuation thereagainst.

Abstract: An air compressor includes a supporting base having an arm extended from a plate, and a cylinder housing formed integral with the arm and the plate and having an outlet tube. The cylinder housing includes three or more ducts extended outwardly from the outlet tube and communicating with the outlet tube, for attaching a pressure gauge, a nozzle or other devices. A piston is slidably received in the cylinder housing. A motor is attached to the plate, and includes a spindle extendible through either the lower or the upper portion of the plate, and coupled to the piston with an eccentric member, to move the piston to the cylinder housing in a reciprocating action, in order to generate pressurized air.

Abstract: An air pump having an adjustable interval between an electromagnetic device and an air chamber includes at least a upper cap, a base, an electromagnetic device, an air chamber and a regulator. The regulator has a rotary knob to drive a bolt and move a coupling member up and down. The coupling member has struts at two sides to force a guiding slot of a coupling seat to move thereby to drive the electromagnetic device to move forwards and rearwards for adjustment. As a result the moving frequency of the crank in the air chamber can be altered to adjust the air supply amount being delivered.

Abstract: Driving controlling apparatus and method for a reciprocating compressor capable of stably driving a reciprocating compressor when a reciprocating compressor is operated or an output capacity of the reciprocating compressor is varied, by matching an impedance of the apparatus to an inductance of a motor, and capable of enhancing an efficiency of the reciprocating compressor. The apparatus comprises an output capacity determining unit for determining an output capacity of a reciprocating compressor; an over-stroke preventing unit for preventing an over-stroke of a motor inside the reciprocating compressor; and an impedance matching unit for matching an inductance of the reciprocating compressor to an impedance of the apparatus.

Abstract: The present invention provides an airflow generator, including a plate, a magnetic brake and a housing. The plate has a pivot point and a swinging end. Two magnetic poles are assembled at predefined locations on the plate nearby the pivot point. The magnetic coil is located opposite to magnetic poles of the plate, then a controller is used to control the magnetization state of the magnetic coil, thus yielding suction and repulsion with magnetic pole and driving the swinging end of the plate. The volume of the generator of the present invention is minimized, but an efficient heat-radiating effect is achieved to resolve the bottleneck of a typical radiator fan, making it applicable to the heat-radiating structure of various small-sized electronic devices.

Abstract: A linear compressor has a rigid frame (11, 12, 13), on which an oscillating body (16) is held via at least one spring (9) so as to be able to effect reciprocating motion and at least one electromagnet (14, 15) is mounted for driving the reciprocating motion of the oscillating body (16), and having a pump chamber (13) forming part of the frame, in which pump chamber a piston, connected to the oscillating body (16), may effect reciprocating motion. The frame (11, 12, 13) is connected in an oscillatory manner to a fixing member (1) for fixing the linear compressor to a support by a diaphragm spring (5, 7, 9) oriented transversely of the direction of movement of the oscillating body.

Abstract: A miniature cooling device includes numerous improvements capable of increasing the reliability and useful lifetime of the device, as well as improving electrical power to cooling power conversion efficiency. The improvements include a unitary DC motor shaft design that incorporates a unitary mass flywheel into the shaft element and provides a solid shaft cross-section for increasing magnetic flux density in the DC motor. Additional improvements include a bend resistant flexible vane in the DC motor to compression piston drive coupler, reduced dead space volume within the compression cylinder, improved heat dissipation by a cylinder head cover and an athermalized compressor design that provides uniformly efficient operation over a wide range of operating temperatures. Further improvements include fabrication and coating improvements that increase the life of compression piston and compression cylinder wear surfaces.

Abstract: A cylinder assembly for a linear compressor includes a cylinder chassis with an inner surface defining a cylinder space extending along an axis from a cylinder head end. The cylinder space is at least substantially cylindrical. A cylindrical cylinder liner, open at both ends is located within the chassis. The outer surface of the liner is engaged against the cylinder space defining portion of the inner surface of the chassis. A valve plate is being bonded or fused to the cylinder head end of the cylinder liner. The valve plate sealingly closes the cylinder head end of the cylinder space.

Abstract: A cam driven piston compressor includes one or more cams powered by a motor, the cams being adapted to rotate through 360 degrees, and one or more cam followers, each of which is in contact with one of the cams. The compressor also includes one or more pistons wherein each of the pistons is attached to one of the cam followers, one or more cylinders wherein each of the cylinders encloses one of the pistons, and a compressor head in contact with the cylinders.

Abstract: The present invention is aimed to provide a pump which can not only obtain high discharging pressure and large capacity but obtain a substantially non-pulsating flow with a miniaturized configuration and even if the pump is operated with low power.

Abstract: A compressor unit has a motor and a reciprocating-piston compressor which is driven via a slider-crank drive. The slider-crank drive includes a crank wheel and a connecting rod, which is connected to the crank wheel and a piston. The piston stroke can be adjusted by a threaded connection that allows an exact spacing between the crank drive and the piston to be set.

Abstract: The system and method of the present invention includes an electrical to mechanical converter (EMC), such as a motor, and a hydraulic pump-and-cylinder arrangement that is connected to the electrical to mechanical converter for input, and to a sucker rod pump for output, in at least one embodiment. The entire assembly can be deployed below the level of the well fluid in a well. The EMC-driven hydraulic pump and cylinder can provide reciprocating linear motion to operate the sucker rod pump. In contrast, this linear motion is normally provided by sucker rods connected to a plunger inside a pump barrel and a pumping unit on the surface. The invention provides the required linear motion for the sucker rod pump to operate, but without the need for sucker and a surface pumping unit.

Abstract: A magnetic coupling system may be used in a fluid displacement apparatus to magnetically couple a drive shaft to a piston. The magnetic coupling system may include first and second magnetic couplers at the ends of the drive shaft and piston, respectively. The second magnetic coupler is configured to magnetically engage the first magnetic coupler and configured to mechanically engage the first magnetic coupler if the couplers disengage magnetically.

Abstract: A housing, preferably a hermetically sealing housing (1), a small-type refrigerating machine for receiving an electromotor and a piston-cylinder unit driven by the same for compressing a refrigerant guided via feed lines and discharge lines into the housing (1) and into the piston of the piston-cylinder unit, with the housing (1) being provided with at least one connecting element (6, 7, 8, 9, 15) for fastening to a support plate (5, 10, 14). It is provided in accordance with the invention that in a direction of view perpendicular to the support plate (5, 10, 14) the outermost dimensions of the housing (1) protrude beyond the outermost dimensions of the at least one connecting element (6, 7, 8, 9, 15), and the at least one connecting element (6, 7, 8, 9, 15) or its imaginary shortest connecting line along the surface of the housing (1) encloses a surface area of the housing (1) facing the support plate (5, 10, 14).

Abstract: A multi-stage compressor is disclosed, which comprises: two motion converters driven by one driving shaft and converting a rotary motion to a straight-line reciprocating motion; first and second pistons (62) connected to one of the motion converters in opposite directions and moving reciprocatively in a straight line; and third and fourth pistons (72) connected to the other one of the motion converters in opposite directions, arranged at a predetermined angle with respect to the first and second pistons (62), and moving reciprocatively in a straight line, and which is characterized in that at least two of the four pistons operate for first-stage compression and at least one of the others operate for second-stage compression.

Abstract: The invention relates to a compressor for hermetically sealed small refrigeration machines, comprising a cylinder with a cylinder housing and a piston that is guided in the piston bore of the cylinder and that compresses a working medium. The cylinder is sealed by a disc-type valve plate in the axial direction, a cylinder cover lying against or being surrounded by the plate. According to the invention, the cylinder housing comprises axial extensions facing towards the cylinder cover and located in the peripheral area of the cover. A first axial section of the axial extensions lies against the cylinder cover in the contact region between the cylinder cover and the valve plate and a second axial section surrounds the cylinder cover with a small degree of play.

Abstract: A pump for pumping discrete liquid volumes is provided with an anti-rotation construction to prevent a nut mated to a rotating head screw from rotating when the lead screw is rotated. The anti-rotation construction comprises a set of rails that slideably fit within a mating set of tracks. The pump also can include a variable homing position for a pump piston having at least two different homing positions.

Abstract: A compressor for a tire-repairing kit contains a second toothed wheel provided with a journal. The journal is functionally connected to a piston in such a way that the piston moves up and down when the second toothed wheel rotates. The inertial forces of the piston carrying out the up and down movement are compensated by a counterweight which is embodied in an integral manner with the second toothed wheel and is fixedly connected thereof.