A recessed part is provided in a position, in which an upper vane and a lower vane slide, in an outer peripheral part of an intermediate partition plate in a rotary compressor. Double of eccentric amounts in an upper eccentric part and a lower eccentric part of a rotating shaft is 30% or more of entire lengths in a sliding direction of the upper vane and the lower vane respectively. A width W of the recessed part in a circumferential direction of the intermediate partition plate is larger than a thickness T of each of the upper vane and the lower vane. When a depth of the recessed part is D and an entire length of each of the upper vane and the lower vane is L, D≥0.1×L . . . Expression 1 is satisfied.

An apparatus for compressing gas-phase fluid including a housing having a wall, a stator having a base plate and a helical wall extending from one side of the base plate, and an orbiter having a base plate and a helical wall extending therefrom. The base plates are disposed such that the wall of the stator and the wall of the orbiter engage with each other to define closed working chambers. The volumes and positions of the working chambers are changed in response to the motion of the orbiter. The apparatus includes a guide device having an opening formed in the base plate of the orbiter and a pin coupled to the housing. The pin engages the opening. A sliding element is disposed between the wall of the housing and the orbiter and coupled to the wall. The pin is pressed into an opening formed in the sliding element.

A scroll compressor including a scroll assembly comprising an orbiting scroll and a non-orbiting scroll; and a silencing device provided above the scroll assembly and comprising a partition plate and a silencer. The partition plate is used to divide an interior space of the scroll compressor into a high-pressure chamber and a low-pressure chamber, and the partition plate has a central through-hole. The silencer is arranged above the gas outlet, 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.

An object is to optimize a back pressure pressing an orbiting scroll against a fixed scroll in a scroll compressor to which an injection cycle is applied. A back pressure control valve (400) adjusting back pressure (Pm) in a back pressure chamber (H4), adjusts the opening degree of a first valve body (424) increasing and decreasing the flow rate of lubricant which has been separated from gaseous refrigerant compressed in a compression chamber and is supplied to the back pressure chamber (H4), in accordance with suction pressure (Ps) in a suction chamber (H1), discharge pressure (Pd) in a discharge chamber (H2), and injection pressure (Pinj). Then, the back pressure control valve (400) increases and decreases the lubricant flow rate in accordance with injection pressure (Pinj) as well as suction pressure (Ps) and discharge pressure (Pd), to adjust back pressure to target back pressure varying in accordance with injection pressure (Pinj).

A driving structure of a three-axis multi-stage Roots pump comprises a pump body, wherein a gear end cover is mounted at one side of the pump body, an air outlet end moving bearing air sealing unit is mounted on the other side of the pump body, and the bearing end cover is mounted on the pump at the side of the pump body; a driving axis, a first driven axis and a second driven axis are further provided inside the pump body, and the driving axis is connected with the first driven axis and the second driven axis through the gear, respectively; and both ends of the driving axis, the first driven axis and the second driven axis are movably connected to an air inlet end gear mechanical seal driving unit and an air outlet end moving bearing air sealing unit, respectively. The present invention overcomes the deficiencies of the prior art, a fixed bearing limiting unit not only plays a radial supporting role, strengthens the rigidity of an independent axis, but also reduces the diameter of the axis, and at the same time, evenly distributes to the two axial ends in the axial deformation process, avoiding deformation in a single direction, reducing the amount of displacement by nearly half, and also improving the sealing efficiency of the system.

A compressor is provided and may include a shell and a stator. The shell includes an inner surface and an outer surface. The stator may be attached to the shell at the inner surface via a first stake. The first stake may be formed by deforming a portion of the shell into the stator.

A gas ejection apparatus includes: a cylinder having a rotating member that rotates within the cylinder; a motor coupled to the rotating member of the cylinder and that causes gas to be compressed inside the cylinder and to be ejected from the cylinder by causing rotation of the rotating member; a control circuit board that controls the motor; and a case in which the cylinder, the motor and the control circuit board are disposed. The case extends in a planar direction and has side surfaces that are orthogonal to the planar direction. The motor and the cylinder are arranged adjacent to each other in the planar direction of the case. The control circuit board is disposed adjacent to and substantially parallel to one of the side surfaces of the case.

Disclosed is an energy-efficient vane pump which comprises a pump body. A drive shaft is arranged within the pump body. A rotor is fitted over the drive shaft. A stator is arranged besides the rotor. A plurality of vane grooves are arranged on the rotor. The vanes are evenly distributed between the rotor and the stator. A root end of the vane is located within the vane groove, and a tip end of the vane faces the stator. Side plates are arranged on both sides of the rotor. Each of the side, plate is provided with a high-pressure chamber and an oil outlet chamber. A communication channel is located on the side plate between the high-pressure chamber and the oil outlet chamber. The side plate is provided with a partition structure in the communication channel between the high-pressure chamber and the oil outlet chamber.

A screw compressor for a heating, ventilation, and air conditioning (HVAC) system. The screw compressor includes a housing having an inlet end and an outlet end for refrigerant to pass into and out of the housing. A motor is within the housing. A plurality of screw sets are arranged about the motor. The screw sets receive refrigerant entering through the inlet, compress the refrigerant between meshed rotors of the plurality of screw sets, and direct refrigerant out of the housing through the outlet end of the housing.

A water pump for a marine engine includes a drive flange for rotating a drive shaft, a housing having an internal cavity and a removable cap assembly. The removable cap assembly includes a cap lock ring secured to the housing, a cartridge extending into the internal cavity of the housing and an impeller rotatable inside the cartridge. The cap lock ring and cartridge are snap-fit together. The rotatable drive shaft has splines, which mate with a splined portion of an impeller to rotate the impeller. To replace the impeller, an operator twists the cap lock ring off the housing without any tools and pulls the cap assembly away from the housing disengaging the impeller from the drive shaft. A new cap assembly replaces the worn cap assembly.