Abstract:
A system is provided for adjusting the volume ratio of a screw compressor. The system can use a port in a rotor cylinder to bypass vapor from the compression chamber to the discharge passage of the compressor. A valve can be used to open or close the port to obtain different volume ratios in the compressor.
Abstract:
본 발명은 로터리 압축기(1)에 관한 것이다. 본 발명에 의한 로터리 압축기는, 베인챔버(413)에 연결되는 연결구멍 (416)의 내경과 그 연결구멍에 삽입되는 연결튜브(531)의 외경을 규정하여 상기 연결구멍(416)에 연결튜브(531)가 긴밀하게 밀착되도록 함으로써, 냉매가 연결구멍(416)과 연결튜브 (531)사이로 누설되는 것을 방지하여 베인의 모드전환이 신속하고 정확하게 이루어지도록 할 수 있고 이를 통해 압축기(1)의 성능이 향상될 수 있을 뿐만 아니라 베인(430)의 떨림으로 인한 소음을 미연에 방지할 수 있다.
Abstract:
A welding system is provided that includes an engine, a compressor coupled to the engine, and a regulator coupled to the compressor and located on a control panel. Another welding system is provided that includes an engine, a compressor coupled to the engine and a monitor circuit configured to monitor the duration of operation of the compressor by monitoring engagement of the clutch. A pressure gauge configured to be coupled to a compressor is also provided.
Abstract:
A pumping system has a motor (32) for driving a pumping mechanism (30) . A variable frequency drive unit (36) has an input for receiving electrical energy of relatively high power and first, fixed frequency from a power supply, and an output coupled to an input (46) of the motor for supplying electrical energy of relatively low power and second, variable frequency to the motor. This second frequency preferably has a maximum value greater than the first frequency. A control circuit (50) is provided for selectively coupling the motor input (46) directly to the power supply for the supply of said relatively high power energy to the motor to maximise the torque that can be produced by the pumping mechanism. After a period of time the control circuit terminates the direct coupling of the motor input to the power supply for the supply of said relatively low power energy to the motor.
Abstract:
A compressor system operable to shutdown in response to a shutdown signal . The compressor system includes a compression device (22; 34) operable between a first speed and a second speed to produce a flow of compressed fluid at a pressure. A blowdown valve (48) is movable between a closed position and an open position in which at least a portion of the flow of compressed fluid passes through the blowdown valve (48) to reduce the pressure of the flow of compressed fluid. A sensor (46) is positioned to measure the pressure and a controller (47) is operable to move the blowdown valve (48) to the open position and set the speed of the compression device (22; 34) to a low set point speed in response to the shutdown signal.
Abstract:
An internal intermediate pressure 2-stage compression type rotary compressor (10), which comprises an electrically-driven element (14) in a closed vessel (12), and first and second rotary compression elements (32, 34) driven by the electrically-driven element (14), wherein CO2 coolant gas subjected to first-stage compression by the first rotary compression element (32) is discharged into the closed vessel (12) and the discharged coolant gas of intermediate pressure is passed through an accumulator (106) and subjected to second-stage compression by the second rotary compression element (34), the rotary compression elements (32, 34) comprising upper and lower cylinders (38, 40), upper and lower rollers (46, 48) eccentrically rotating within the cylinders, upper and lower vanes (50, 52) contacting the rollers and partitioning the upper and lower cylinders into higher and lower pressure chambers, the volume ratio of the upper and lower cylinders (38, 40) for first and second stage compression being set at 1 : 0.65 so that the equilibrium pressure and the intermediate pressure are equal. Since the pressure variation at the start of operation is low, oil forming is suppressed and the pressure vessel is easy to design and can be reduced in weight.
Abstract:
A refrigerating cycle comprising first safety means for leaking a high pressure to a low pressure side when the high pressure is higher than a first predetermined pressure, second safety means for releasing the high pressure to the atmosphere when the high pressure exceeds a second predetermined pressure, third safety means for stopping the operation of a compressor when the high pressure is lower than a third predetermined pressure and fourth safety means for releasing the low pressure to the atmosphere when the low pressure exceeds a predetermined pressure. Furthermore, splash prevention films are formed at predetermined positions of appliances constituting the refrigerating cycle.
Abstract:
The present invention relates to a screw rotor compressor that includes two mutually coacting helical screw rotors and a rotor housing (1). The housing (1) includes a first end wall (2) and a second end wall (3) and a barrel wall (7, 11) that interconnects the end walls. The housing (1) has internally the shape of two mutually intersecting cylinders and the first end wall (2) includes an inlet opening (19). The barrel wall (7, 11) includes an outlet opening (6) adjacent the second end wall (3), and also includes a further opening (9), this further opening extending from the outlet opening (6) towards the first end wall (2) and widening over both cylinder surfaces. The housing (1) also includes a movable or displaceable part (11) which coacts with the opening (9) and which engages the housing in a first position such as to form the mutually intersecting cylindrical surfaces, and which is out of engagement with said housing in a second position and therewith distanced from said further opening. The compressor also includes a maneuvering device for placing the movable part (11) selectively in its first or its second position. The maneuvering device is adapted to actuate a rotatable shaft (12) which is either mounted on the compressor or firmly fixed relative thereto and which is connected to said movable part (11) through the medium of a connecting element (17).