A method for controlling the liquid injection of a compressor device, where the compressor device includes at least one compressor element, the compressor element includes a housing that includes a compression space in which at least one rotor is rotatably affixed by bearings, and liquid is injected into the compressor element. The method includes providing two independent separated liquid supplies to the compressor element, where one liquid supply is injected into the compression space and the other liquid supply is injected at the location of the bearings.

A positive displacement device that converts energy, namely positive displacement compressors that rotate in a single rotational direction to displace working fluid contained in operating chambers. The device described herein is particularity advantageous for the ability to achieve high compression ratios in combination with high discharge pressure and high volumetric throughput in a single stage.

A liquid supply type screw compressor that can suppress a rise in temperature of a liquid while reducing work for stirring the liquid is provided. The liquid supply type screw compressor has a male rotor 11A and a female rotor 11B, male-rotor-side working chambers formed at grooves of the male rotor 11A, and female-rotor-side working chambers formed at grooves of the female rotor 11B. In addition, the liquid supply type screw compressor has: a liquid supply nozzle 28 that is arranged on one side in the rotor axial direction which is a low-pressure side of an intersection P at which a high-pressure-side cusp 23 intersects a ridge line L of a trailing lobe tip of the female rotor 11B that defines a female-rotor-side working chamber V5 immediately after a start of delivery, the liquid supply nozzle 28 supplying the liquid to the male-rotor-side working chamber; and a liquid supply nozzle 29 that is arranged on the other side in the rotor axial direction which is a high-pressure side of the intersection P, and supplies the liquid to the male-rotor-side working chamber, and the liquid supply amount of the liquid supply nozzle 29 is made greater than the liquid supply amount of the liquid supply nozzle 28.

A scroll compressor is provided that can prevent liquid from being accumulated with a simple structure.

The scroll compressor includes: a fixed scroll 11; an orbiting scroll 12; and a rotation shaft 13 that extends in the horizontal direction and causes the orbiting scroll 12 to orbit relative to the fixed scroll 11, and liquid is injected to a working chamber at an intake process or to the upstream side thereof. An enclosing point P of a working chamber formed near the outer end of a fixed wrap 16 of the fixed scroll 11 is positioned below a center O of the rotation shaft 13 and at the lowest point of the contour of the working chamber having shifted to the lowest position. The fixed scroll 11 has an inclined wall surface 33 that is positioned below the center 0 of the rotation shaft 13, is made to face upward, and extends from the dust wrap 17 to the outer end of the fixed wrap 16. The inclined wall surface 33 is formed so as to be sloped down gradually from the dust wrap 17 toward the outer end of the fixed wrap 16.

A scroll compressor includes a housing; a motor provided in the housing; a rotating shaft rotated by the motor; an orbital scroll orbital moved by the rotating shaft; and a fixed scroll forming a compression chamber together with the orbital scroll, wherein the fixed scroll includes an injection hole guiding an intermediate pressure refrigerant to the compression chamber, wherein the compression chamber is formed in a pair, and wherein the injection hole is formed to communicate with any one of the pair of compression chambers when communicating with the other one of the pair of compression chambers. Thereby, an amount of refrigerant discharged from the compression chamber is increased, and thus the performance and efficiency of the compressor may be improved.

An oil-free water-injected screw air compressor comprises a housing that encloses two rotors for generating compressed air, and an air water separator for separating the water from the compressed air. Water injection can effectively cool a compressor, and some embodiments provide a sealing system for isolation of compressor bearing lubricant from water used for cooling.

A compressor element (1) comprising at least one compression member (2), a housing (3) and a rotatable shaft (4) rotatably connecting the at least one compression member (2) to the housing (3), wherein at least one intermediate element (5) is provided between the rotatable shaft (4) and the housing (3) for facilitating rotation of the rotatable shaft (4), wherein the compressor element (1) further comprises at least one oil injector (6) extending from an inlet port (7) to at least one nozzle (8a, 8b, 8c) via an oil channel (9), wherein the oil channel (9) is shaped to allow a substantially primary flow of oil through the channel (9) for cooling of the at least one intermediate element (5).

A method for controlling a compressor device (1) with a compressor element (2) and oil circuit (14) with oil (15) that is injected into the compressor element (2) by a fan (19) via a cooler (18), with a bypass pipe (20) across the cooler (18), whereby when the temperature (T) of the compressor element (2) is less than a value (T.sub.set), the method including the following steps: switching the fan (19) off; when the temperature (T) is still less than T.sub.set, driving the oil (15) via the bypass pipe (20); when the temperature (T) is still less than T.sub.set, decreasing the quantity of oil (15) that is injected into the compressor element (2) until the temperature (T) is equal to T.sub.set

A temperature control apparatus (70) includes a heat exchanger (71) configured to exchange heat with the surroundings using a phase change of a refrigerant, a rotary pump (73) configured to receive the refrigerant from the heat exchanger (71) and fuse the refrigerant with oil contained inside the rotary pump, and an oil water separator (74) configured to receive the refrigerant fused with the oil from the rotary pump (73) and separate the refrigerant from the oil. The temperature control apparatus further includes a refrigeration cycle that implements a cooling function by circulating the refrigerant separated from the oil back to the heat exchanger (71).

A compact energy cycle construction that operates as or in accordance with a Rankine, Organic Rankine, Heat Pump, or Combined Organic Rankine and Heat Pump Cycle, comprising a compact housing of a generally cylindrical form with some combination of a scroll type expander, pump, and compressor disposed therein to share a common shaft with a motor or generator and to form an integrated system, with the working fluid of the system circulating within the housing as a torus along the common shaft and toroidally within the housing as the system operates.