摘要:
A Roots-type machine is connected to an enclosure to be evacuated via a suction inlet portion, and to a primary pump via a delivery outlet portion. A bellows is disposed transversely in the inlet portion, one end of the bellows being fixed in gastight manner in the wall, and the other end being closed and movable, so that the bellows forms a regulating member for regulating the gas-flow sectional area in the inlet portion. The outside face of the movable end of the bellows is subjected to the pressure in the inlet portion, and the inside face of the movable end is subjected to the pressure in the delivery outlet portion via a rod passing through the wall, and via a channel. The invention applies to Roots-type machines, in particular for automatically regulating the pumping speed so as to match it to the flow-rate of the corresponding primary pump.
摘要:
A variable capacity vane compressor has a control element for determining timing of start of compression of a refrigerant gas. In a high-pressure chamber there prevails control pressure which acts on the control element for urging same toward a maximum capacity position thereof. The control pressure is created by introducing the refrigerant gas from a discharging space within which discharge pressure prevails into the high-pressure chamber via a high pressure-introducing passageway. The high pressure-introducing passageway has a restriction hole for restricting flow of the refrigerant gas. An electromagnetic value opens and closes the restriction hole in response to an external control signal. The refrigerant gas is allowed to constantly leak from the high-pressure chamber into a suction chamber via a leak passage, the leak passage having a cross-sectional area smaller than that of the restriction hole.
摘要:
A variable-delivery vane-type rotary compressor includes means for controlling discharge by-passed from an actuating chamber and an inhalator chamber by changing area of opening provided between a front plate and a cam ring. The means can control discharge by rotation of a disc having at least one by-pass opening. The disc can rotate in accordance with signals produced from at least one sensor.
摘要:
A capacity control device for a compressor used with an air conditioning system for an automotive vehicle and driven by an engine of the automotive vehicle, including flow resistance portions provided in a refrigerant inlet passage and capable of reducing the flow rate of a refrigerant flowing into working chambers of the compressor as the rotational speed of the compressor (or the engine speed) rises, to thereby reduce the volumetric efficiency of the compressor in a high engine speed range.
摘要:
A compressor is provided which has a housing formed with a volume control chamber located in the vicinity of the discharge port and within which a valve is mounted, a first port communicating the volume control chamber with a pumping chamber defined within the housing, and a second port communicating the volume control chamber with the suction port. The valve is disposed so as to open selectively the first port alone or both the first port and the second port, to thereby make it possible to control the discharge rate of pressurized gas or interrupt discharge of same without interruption of driving of the gas pressurizing member of the compressor for compression of gas such as a rotor or a piston.
摘要:
An improved device for regulating the output a compressor arrangement in which a regulator is connected to a throttled balancing pipe interconnected between the suction and the discharge of the compressor arrangement.