An oil-injected multistage compressor device that comprises at least one low-pressure stage compressor element (2) with an inlet (4a) and an outlet (5a) and a high-pressure stage compressor element (3) with an inlet (4b) and an outlet (5b), whereby the outlet (5a) of the low-pressure stage compressor element (2) is connected to the inlet (4b) of the high-pressure stage compressor element (3) via a conduit (6), characterized in that an intercooler (9) is provided between the low-pressure stage compressor element (2) and the high-pressure stage compressor element (3) in the aforementioned conduit (6) and that the compressor device (1) is also equipped with a restriction (10) for limiting the amount of oil injected in the low-pressure stage compressor element (2).

A compressor comprises a housing including a first opening to form a receiving space and a retaining wall, wherein the receiving space is divided, by the retaining wall, a low-pressure chamber and a controller chamber. A compressing mechanism further comprises a fixed scroll plate including a low-pressure side of scroll wraps and a high-pressure side, opposite to the scroll wraps; an orbiting scroll plate, located in the receiving space, including a side, facing the scroll wraps of the fixed scroll plate, of scroll wraps and a compression chamber is formed by the scroll wraps of the fixed scroll plate and the scroll wraps of the orbiting scroll plate; an electrical machinery mechanism, located in the low-pressure chamber, including a rotor and a stator, wherein the electrical machinery mechanism drives the compressing mechanism to rotates to compress refrigerant in the compression chamber.

A motor vehicle-mounted system for controlling an air compressor or hydraulic fluid pump is provided. The system can alternatively include a battery box or an engine-driven welder configured for supplying DC power to an electric motor via an electric motor controller. The electric motor can operate an air compressor, which can further include an air tank for storing compressed air. The electric motor can also operate a hydraulic fluid pump for operating a pressurized hydraulic fluid system.

A motor vehicle-mounted system for controlling an air compressor or hydraulic fluid pump is provided. The system can alternatively include a battery box or an engine-driven welder configured for supplying DC power to an electric motor via an electric motor controller. The electric motor can operate an air compressor, which can further include an air tank for storing compressed air. The electric motor can also operate a hydraulic fluid pump for operating a pressurized hydraulic fluid system.

A method of updating the program of a gas compressor system that supplies at least one of pressure and flow rate of gas discharged from the discharge piping system based on predetermined values comprising: the management device obtaining an update program, updating a program for an in-service compressor of the plurality of gas compressors whose program is to be updated, and driving other gas compressors of the plurality of gas compressors, which are different from the operating compressor whose program is to be updated, in accordance with the predetermined value.

A rotary compressor (700) and a refrigeration cycle device (1000) having same are provided. The rotary compressor comprises: a liquid reservoir (1), a first direction control assembly (49), and a compression mechanism. The compression mechanism comprises two cylinders and two gas injection holes, in which a sliding vane of one cylinder is pressed against an outer circumferential wall of a piston in the cylinder and a gas injection hole is used for injecting a refrigerant to the cylinder, while the sliding vane of the other cylinder is optionally in contact with or separate from the piston in the cylinder, the other gas injection hole is used for unidirectionally injecting the refrigerant into the cylinder; a first valve port (491) of the first direction control assembly (49) is connected to the gas suction port of the other cylinder, a second valve port (492) thereof is connected to liquid reservoir (1), a third valve port (493) thereof is in communication with the exhaust hole, and the second valve port (492) and the third port (493) are optionally in communication with the first valve port (491).

A rotary compressor (700) and a refrigeration cycle device (1000) having same are provided. The rotary compressor comprises: a liquid reservoir (1), a first direction control assembly (49), and a compression mechanism. The compression mechanism comprises two cylinders and two gas injection holes, in which a sliding vane of one cylinder is pressed against an outer circumferential wall of a piston in the cylinder and a gas injection hole is used for injecting a refrigerant to the cylinder, while the sliding vane of the other cylinder is optionally in contact with or separate from the piston in the cylinder, the other gas injection hole is used for unidirectionally injecting the refrigerant into the cylinder; a first valve port (491) of the first direction control assembly (49) is connected to the gas suction port of the other cylinder, a second valve port (492) thereof is connected to liquid reservoir (1), a third valve port (493) thereof is in communication with the exhaust hole, and the second valve port (492) and the third port (493) are optionally in communication with the first valve port (491).

A compressor system for an utility vehicle includes at least one compressor, at least one electric motor which drives the compressor, at least one electric motor control unit and at least one air treatment device. The electric motor control unit is designed and configured in such a way that it controls the electric motor and at least partly the air treatment device.

The present invention is directed to a method for controlling the outlet temperature of an oil injected compressor or vacuum pump comprising a compressor or vacuum element provided with a gas inlet, an element outlet, and an oil inlet, said method comprising the steps of: measuring the outlet temperature at the element outlet; and controlling the position of a regulating valve in order to regulate the flow of oil flowing through a cooling unit connected to said oil inlet; whereby the step of controlling the position of the regulating valve involves applying a fuzzy logic algorithm on the measured outlet temperature; and in that the method further comprises the step of controlling the speed of a fan cooling the oil flowing through the cooling unit by applying the fuzzy logic algorithm and further based on the position of the regulating valve.

System and methods are provided and include a compressor operable in a refrigeration circuit, a first sensor detecting high-side data indicative of a high-side operating condition of a high-pressure side of the refrigeration circuit, a second sensor detecting low-side data indicative of a low-side operating condition of a low-pressure side of the refrigeration circuit, and processing circuitry. The processing circuitry receives the high-side data and the low-side data, determines a high-side fault, a low-side fault, a severe high-side fault, or a severe low-side fault based on the high-side data and the low-side data, operates the compressor in a limp-along mode by restricting power to the compressor or reducing a capacity of the compressor in response to determining at least one of the high-side fault and the low-side fault, and shuts down the compressor in response to determining at least one of the severe high-side fault and the severe low-side fault.