A portable, refrigerant recovery unit for transferring refrigerant from a refrigeration system to a storage tank. The recovery unit includes two, opposed piston heads rigidly attached to respective piston rods that extend along a common fixed axis. The piston rods are rigidly attached to the yoke member of a scotch yoke arrangement. In operation, incoming refrigerant from the system is simultaneously and continuously directed to the opposing piston heads wherein the forces of the pressurized refrigerant on them counterbalance or neutralize one another. The recovery unit also has a cooling fan driven by the motor for driving the scotch yoke in which the fan is driven through a step up gearing arrangement. In operation, the drive shaft of the motor is rotated at a first rate and the driven shaft of the fan is driven at a greater rate (e.g., twice the first rate) by the step up gearing arrangement.

An air compressor for a vehicle includes a chamber portion including an inlet and an outlet mounted thereto, and configured to receive air introduced thereinto through the inlet, a joint, mounted inside the chamber portion, connected to a driving motor, and including eccentric circular portions eccentrically coupled to a center shaft in directions providing equal forces to the center shaft, respectively, and piston portions, coupled to the eccentric circular portions, respectively, inserted into a first cylinder and a second cylinder, respectively, the first cylinder and the second cylinder being disposed to face each other inside the chamber portion, and configured to selectively compress air introduced into the cylinders while reciprocating by a discharge process and an intake process performed by rotation of the joint and to discharge the compressed air through the outlet.

The present invention provides a system and method for economically using compressed air as automobile power source, comprising: a compressed air power device, which includes automobile air storage tubes (1) to store a sufficient amount of high-pressure compressed air and a cylinder-combined engine consisting of the first and second cylinders (9)(10), and which can make full use of the compressed air to produce driving power; a mechanism to produce, store and provide high-pressure compressed air, which includes a boiler-type high-pressure compressed air producing and storing device, abbreviated as boiler-type HCAPS device (4), to be able to use electricity during periods of low energy demand (off-peak) such as at night simultaneously recovering the by-produced heat for central heating, and pressurizing and inflating into the automobile air storage tubes (1) during daytimes; brake energy recovery and regeneration devices, which include a spring reserving-releasing device and/or a compressed air reserving-releasing device to save the compressed air in the automobile air storage tubes (1) for saving the driving power; an inner gear ring assembly, which includes an inner gear ring (2) gearing meshing with inner acting gears (45), with the first and second accelerating gears (72)(92), with a flywheel front inner meshing gear (48) and reset gears (46), for transmitting torque and mixing/outputting power; some clutch transmission devices and a controller, which controls orderly coordinated operation of devices and mechanisms.

A fluid end (15) for a multiple reciprocating pump assembly (12) comprises at least three plunger bores (61) or (91) each for receiving a reciprocating plunger (35), each plunger bore having a plunger bore axis (65) or (95). Plunger bores being arranged across the fluid head to define a central plunger bore and lateral plunger bores located on either side of the central plunger bore. Fluid end (15) has suction valve bores (59) or (89), each suction valve bore receiving a suction valve (41) and having a suction valve bore axis (63) or (93). Discharge valve bores (57) or (87), each discharge valve bore receiving a discharge valve (43) and having a discharge valve bore axis (63) or (93). The axes of at least one of suction and discharge valve bores is inwardly offset in the fluid end from its respective plunger bore axis.

A fluid end (15) for a multiple reciprocating pump assembly (12) comprises at least three plunger bores (61) or (91) each for receiving a reciprocating plunger (35), each plunger bore having a plunger bore axis (65) or (95). Plunger bores being arranged across the fluid head to define a central plunger bore and lateral plunger bores located on either side of the central plunger bore. Fluid end (15) has suction valve bores (59) or (89), each suction valve bore receiving a suction valve (41) and having a suction valve bore axis (63) or (93). Discharge valve bores (57) or (87), each discharge valve bore receiving a discharge valve (43) and having a discharge valve bore axis (63) or (93). The axes of at least one of suction and discharge valve bores is inwardly offset in the fluid end from its respective plunger bore axis.

An air compressor includes a compression machine configured to generate compression air, a main tank configured to store therein the compression air, an extension tank configured to store therein the compression air, a connection pipeline provided between the main tank and the extension tank to be removably inserted thereto, and a fastening unit configured to releasably connect the main tank and the extension tank with each other.

Drive mechanism for rotary compressor or pump that consists of a casing (1) formed by two housings where two diametrically opposed cylinders (2), where the pistons (3) slide, are coupled, each of the pistons being attached by means of a connecting rod (5) to the end of a lever (4) which pivots about the other end (9), located on the periphery of the casing (1) and is forced by the journal of a crankshaft (6) that slides along a slot (7), made in the central area of this lever, and is operated by an external mechanism, the whole assembly being able to rotate about the crankshaft, which remains static and coupled to the structure or support and generates a linear piston cycle at each revolution.

A pump includes: a base with a through-hole flanked by an intake-hole and discharge-hole; an external cylinder fixed to the base; an end-fitting element disposed at external cylinder and having a through-hole; an internal cylinder inserted into the through-hole of end-fitting element and thereby partially received in external cylinder to fit coaxially inside external cylinder; a handle fixed to internal cylinder; a delivery pipe fixed to the base's through-hole and received coaxially in internal cylinder; an internal cylinder piston fixed to delivery pipe and received in internal cylinder; an external cylinder piston fixed to internal cylinder, received in external cylinder, and having a through-hole penetrated by delivery pipe; a check-valve disposed in intake-hole to ensure unidirectional gas movement therein; a discharge-valve disposed in discharge-hole; a control element for controlling discharge-valve to open and close; and a guide-channel communicating with the base's through-hole and intake-hole and connected to a nozzle.

Provided is a performance testing device including: a compressor configured to generate compressed air; an air storage tank configured to receive the condensed air generated by the compressor; a regulator connected to each of the compressor and the air storage tank to control a pressure of the compressed air; a main supply line connected to the regulator to move the compressed air; an input port line and an output port line connected to the main supply line and configured to deliver the compressed air to each of an input port and an output port formed at both ends of a test object; and a pneumatic booster configured to pressurize the compressed air received in the input port line or the output port line, wherein in order to test a performance of the test object, the pressurized condensed air is applied to the input port and the output port.

A fluid end 15 for a multiple reciprocating pump assembly 12 comprises at least three plunger bores 61 or 91 each for receiving a reciprocating plunger 35, each plunger bore having a plunger bore axis 65 or 95. Plunger bores being arranged across the fluid head to define a central plunger bore and lateral plunger bores located on either side of the central plunger bore. Fluid end 15 has suction valve bores 59 or 89, each suction valve bore receiving a suction valve 41 and having a suction valve bore axis 63 or 93. Discharge valve bores 57 or 87, each discharge valve bore receiving a discharge valve 43 and having a discharge valve bore axis 63 or 93. The axes of at least one of suction and discharge valve bores is inwardly offset in the fluid end from its respective plunger bore axis.