Disclosed is a multi-stage compressor, including a gas supplement structure, a low-pressure stage chamber and a high-pressure stage chamber. The gas supplement structure includes a gas supplement inlet and a perforated member wherein the gas supplement inlet is arranged at an upstream location of an exhaust gas flow of the low-pressure stage chamber; the perforated member is arranged at a downstream location of the exhaust gas flow of the low-pressure stage chamber; a liquid refrigerant sprayed from the gas supplement inlet is mixed with exhaust gas of the low-pressure stage chamber to impact on the perforated member; the liquid refrigerant is dispersed, the dispersed liquid refrigerants are re-mixed with the exhaust gas of the low-pressure stage chamber and enter the high-pressure stage chamber.

A motor driven compressor apparatus includes a rotary shaft rotatably supported in a housing, an eccentric bushing eccentrically coupled to the rotary shaft, and a swing pin configured to connect the eccentric bushing and the rotary shaft with each other, wherein the rotary shaft is provided with a flow path configured to pass through the center of a cross-section in the longitudinal direction and, in one direction at which the eccentric bushing is disposed, a first pin insertion hole which communicates with the flow path and into which the swing pin is inserted, the eccentric bushing is provided with a second pin insertion hole into which the swing pin is inserted in the other direction at which the rotary shaft is disposed, and refrigerant leaks between the swing pin and the first pin insertion hole.

A baffle plate for a compressor, a compressor, and refrigeration apparatus are provided. The baffle plate has a plate body, a through hole and a connection part. The through hole is formed in the plate body. The plate body extends from the through hole in a direction deviating from the axis of the through hole. The connection part is connected with the plate body and is used for connecting the plate body to a non-rotating member. A fixed baffle plate is arranged in the compressor, to physically block the gas flow and form a space for stabilizing the refrigerant oil or lubricant oil on one side of the baffle plate corresponding to the oil sump. The space can isolate the disturbance from spiral flow of a lower cavity to the oil sump caused by the rotation of the motor when the compressor operates.

The present disclosure relates to a motor driven compressor apparatus capable of reducing abrasion of an orbiting scroll by implementing decompression without a separate decompression mechanism when a compressor is driven and increasing efficiency of the compressor by adjusting the pressure of a refrigerant, wherein a flow path, which is configured to pass through a center of a cross section in a longitudinal direction, and a first pin insertion hole in one direction at which the eccentric bushing is disposed and configured to communicate with the flow path and into which a swing pin is inserted, are formed in the rotary shaft, a second pin insertion hole, into which the swing pin is inserted, is formed in the eccentric bushing in the other direction at which the rotary shaft is disposed, and the refrigerant leaks between the swing pin and the first pin insertion hole.

A pump having an adjustable delivery volume, including: a pump housing featuring a delivery chamber which includes a delivery chamber inlet for a fluid and a delivery chamber outlet for the fluid; a delivery member, which can be rotated within the delivery chamber, for delivering the fluid; an adjusting device featuring a setting structure, which is mounted such that it can move back and forth within the pump housing in order to adjust the delivery volume of the pump, and a helical spring for applying a spring force, which acts in a setting direction, to the setting structure, wherein the windings of the helical spring are enclosed by an envelope lying on the outside of the helical spring wherein the cross-sectional area of the envelope as measured transversely with respect to the longitudinal direction of the spring changes progressively in the longitudinal direction of the spring.

A scroll compressor comprises: a scroll assembly comprising an orbiting scroll and a non-orbiting scroll which respectively comprise an orbiting scroll profile and a non-orbiting scroll profile and cooperate with each other to form a series of compression chambers, and the scroll assembly defining a gas outlet; and a silencing device provided above the scroll assembly and comprising a partition board and a silencer, the partition board being used to divide an interior space of the scroll compressor into a high-pressure chamber and a low-pressure chamber, the partition board having a central through-hole, the silencer being arranged above the gas outlet, wherein the silencer is fixed to the central through-hole and is independent from the scroll assembly. The silencing device of the scroll compressor can eliminate noise and seal the divided high-pressure and low-pressure chambers, and can be arranged flexibly without interfering with the scroll assembly.

Disclosed are a cylinder, a pump body assembly, a compressor, and a temperature adjusting device. The cylinder includes a cylinder body, and a first cavity and a second cavity are formed in an axial direction of the cylinder body, wherein the first cavity is in communication with the second cavity, and an inner diameter of the first cavity is greater than that of the second cavity; and when the cylinder body operates, the first cavity forms a first working cavity, and the second cavity forms a second working cavity. With such an arrangement, multiple working cavities are formed inside one cylinder body, which simplifies an installation process of the pump body assembly, and enables a pump body with the cylinder to be installed more conveniently and easily, thereby improving installation reliability of the pump body assembly.

A rotary pump including: a pump housing including a circumferential wall, which surrounds a delivery chamber, a first end-face wall and a second end-face wall which delineate the delivery chamber at its end-face sides; a rotor, which can be rotated in the delivery chamber, for forming delivery cells; a pressure outlet which emerges on an outer end-face side of the first end-face wall facing away from the delivery chamber; an outlet gasket which is provided on the outer end-face side of the first end-face wall, for sealing off the pressure outlet; and a pressing device for charging the outlet gasket with an axial pressing force.

A pump body assembly, fluid machinery, and a heat exchange device. The pump body assembly includes: at least two structure members; a cylinder (20) disposed between the two structure members; and a piston assembly disposed in the cylinder (20). The piston assembly includes a piston sleeve (40) and a piston (50) slidably disposed in the piston sleeve (40); an upper end surface of the piston sleeve (40) fits and is limited by a lower end surface of one structure member disposed above the piston sleeve (40), so as to prevent the piston sleeve (40) from displacing along a radial direction relative to the one structure member, thereby effectively solving a problem in prior art that working efficiency of the pump body assembly is affected because the piston sleeve (40) of the pump body assembly is prone to eccentrically rotate.

A rotor and/or stator dampening system includes a stator and/or rotor with a liner selected of one or more materials to achieve a desired dampening effect. In one implementation, a progressive cavity motor or pump includes a stator with an internal axial bore therethrough. The stator has a liner along an axial length thereof with an inwardly facing surface defining the internal axial bore therethrough. The liner has a plurality of axial sections with at least two of the plurality of axial sections being constructed of different materials. A compression resistant mechanism, such as a spring or spring-like device, is disposed within at least one of the axial sections of the liner. The progressive cavity motor or pump also includes a rotor that is disposed and is rotatable within the internal axial bore of the stator to form a moving chamber between the rotor and the stator.