A scroll compressor comprises a partition plate, a compression mechanism, a capacity adjustment device and a sealing assembly. The sealing assembly isolates a back pressure chamber from a high-pressure space and low-pressure space. A first sealing portion is formed between the sealing assembly and the partition plate. The capacity adjustment device is provided with a variable pressure chamber and configured to establish or break the communication between a first compression chamber and the low pressure space by changing the pressure in the variable pressure chamber. According to the compressor, requirements for pressure in the back pressure chamber of the compressor in different load conditions can be balanced, the axial force on the compression mechanism can be reduced, the power consumption of the scroll compressor can be lowered, the system performance can be improved, and the manufacturing cost can be reduced.

A screw compressor includes two screw rotors and two control sliders that are arranged one behind the other in a slider channel. The control sliders have a combined position with mutually facing end surfaces sealing tightly with each other, and being movable together and have a separated position, with positionable spacing from one another, forming an intermediate space. In a transfer position between the combined and separated positions, the control sliders form an inflow chamber into which the medium to be compressed flows out of one of the compression chambers by passing between the mutually facing end surfaces of the control sliders. One of the control sliders is provided with at least one outflow outlet that is adjacent to the inflow chamber and through which the medium from the inflow chamber enters an outflow opening in the slider channel that overlaps with the outflow outlet in this transfer position.

A scroll compressor comprises a partition plate, a compression mechanism, a capacity adjustment device and a sealing assembly. The sealing assembly isolates a back pressure chamber from a high-pressure space and low-pressure space. A first sealing portion is formed between the sealing assembly and the partition plate. The capacity adjustment device is provided with a variable pressure chamber and configured to establish or break the communication between a first compression chamber and the low pressure space by changing the pressure in the variable pressure chamber. According to the compressor, requirements for pressure in the back pressure chamber of the compressor in different load conditions can be balanced, the axial force on the compression mechanism can be reduced, the power consumption of the scroll compressor can be lowered, the system performance can be improved, and the manufacturing cost can be reduced.

A screw compressor, including a compressor housing having a screw rotor chamber arranged therein, two screw rotors that are arranged in the screw rotor chamber and are mounted on the compressor housing, each rotatably about a respective screw rotor axis, and engage in each other by means of their helical contours, and including two control sliders that are arranged one behind the other in a slider channel of the compressor housing in a direction of displacement parallel to the screw rotor axes and are adjacent to both screw rotors by means of slider compression wall surfaces and are movable in the direction of displacement, wherein, in a combined position with mutually facing end surfaces sealing tightly with each other, the first control slider and the second control slider and are movable together in the direction of displacement and, in a separated position, are positionable at a spacing from one another, forming an intermediate space, wherein, at least in a transfer position located between the combined position and the separated position, the control sliders form an inflow chamber into which the medium to be compressed flows out of one of the compression chambers by passing between the mutually facing end surfaces of the control sliders, and wherein one of the control sliders is provided with at least one outflow outlet that is adjacent to the inflow chamber and through which the medium from the inflow chamber enters an outflow opening in the slider channel that overlaps with the outflow outlet in this transfer position.

A fluid transfer device comprising an inner member with a central axis and an outer surface; an outer member coaxially arranged with the inner member, and a space defined radially between the inner and outer members; a first and second axial members; at least one fluid chamber defined in the space having an inlet and an outlet; the first axial member is rotationally fixed relative to the outer member and the second axial member is rotatable about the central axis to vary the volume of the fluid chamber. The relative rotational position of the first and second axial members is defined by a cam arrangement which comprises first and second axial member walls; the first axial member wall forms a first cam track wall which provides a first cam track waveform, the second axial member wall which comprises a second cam track wall; each cam track wall is circumferentially continuous.

A fluid machine and its operating method are provided. The fluid machine (10) includes a main body (1), a screw set (2), a capacity adjustment mechanism (3), an intermediate pressure sensor (5), and a controller (6). The main body (1) includes a low-pressure chamber (11), an intermediate-pressure chamber (12), and a high-pressure chamber (13). The screw set (2) includes a pair of first screws (21) in the low-pressure chamber (11) and a pair of second screws (22) in the high-pressure chamber (13). The capacity adjustment mechanism (4) includes a first slide valve (41) disposed corresponding to the first screws (21) and a second slide valve (42) disposed corresponding to the second screws (22). The intermediate pressure sensor (5) is placed in the intermediate-pressure chamber (12) for obtaining its interior pressure. The controller (6) drives movement of the first slide valve (41) and the second slide valve (42).

A turbocharger is provided herein. The turbocharger includes a housing and an adjustable core at least partially circumferentially surrounded by the housing, the adjustable core having a turbine rotor coupled to a compressor rotor via a shaft. The turbocharger further includes an adjustment mechanism coupled to the adjustable core configured to adjust an axial position of the housing relative to the adjustable core in response to adjustment commands.

A pump with variable suction/discharge amount and a transmission drive device and a driving method thereof. The pump is a rotary vane pump having a vane chamber body. The vane chamber body is composed of a fixed wall member, a movable wall member, a movable vane chamber sleeve and a vane rotor. The vane chamber is extendable/retractable in an axial direction of the vane rotor. At least two pumps are assembled in communication with each other to form a closed loop for the active pump to drive the passive pump. In operation, passive the vane chambers of the active pump and the passive pump are automatically extended/retracted and modulated until the driving force and the load resistance achieve a balanced state passive, the vane chambers and the rotational speeds of the active pump and the passive pump are automatically adjusted to be in inverse proportion to each other.

A screw compressor includes: a containment body including: a suction chamber and a suction port for a fluid to be compressed; a delivery chamber and a discharge port for the compressed fluid; a containment seat for two helical compression rotors; two helical compression rotors; an electric motor to actuate the helical compression rotors; lubrication for the helical compression rotors; filtration of the compressed fluid; an inverter connected to the electric motor; an electronic control unit configured to control the inverter; a low-pressure sensor located at the suction port and connected to the electronic control unit; a high-pressure sensor located at the discharge port and connected to the electronic control unit; an adjustment spool configured for adjusting the width of an outlet opening from the compression rotor chamber; a fluid actuator to move the adjustment spool; a current meter that measures the electric current absorbed by the electric motor.