Pumps – Expansible chamber type – Having separate noncyclic valve
Reexamination Certificate
1999-08-20
2001-07-10
Walberg, Teresa (Department: 3742)
Pumps
Expansible chamber type
Having separate noncyclic valve
C417S437000, C417S307000
Reexamination Certificate
active
06257848
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a compressor which is generally used for an air conditioner.
Various types of compressors are used in air conditioners. Among these compressors, particularly, a piston-type variable displacement compressor has an advantage that its displacement or flow rate can be varied. However, since the piston-type variable displacement compressor has a characteristic that the volume of gas passing through a suction valve during the flow rate of the suction valve is low is decreased, the suction valve generates self-excited vibration in its free movement region due to the interaction with the gas passing through the suction valve. The self-excited vibration of the suction valve causes pressure fluctuation of gas i.e. pressure pulsation. Since the compressor is included in a refrigerating cycle together with an evaporator, a condenser, and connecting pipes therebetween, the pressure pulsation is propagated to the evaporator through the connecting pipes from the compressor. As a result, the evaporator is vibrated, thereby producing noise.
Conventionally, to restrain the propagation of pressure pulsation to the evaporator, such a refrigerating cycle is provided with a silencer on the way of the connecting pipes.
However, the way of providing with a silencer has a lot of side issues, such as, making the system expensive, making a space factor worse, and requiring improved vibration proof of the silencer.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a compressor which can effectively reduce the pulsation in suction pressure due to the self-excited vibration during the flow rate of the suction valve is low, with reducing the danger of causing the side issues.
Other objects of the present invention will become clear as the description proceeds.
According to the present invention, there is provided a compressor for compressing a gaseous fluid. The compressor comprises a suction passage for introducing the gaseous fluid and a control valve which is arranged at the suction passage and is for controlling an open area of the suction passage so that the open area is reduced in a first state where the gaseous fluid has a relatively low flow rate in the auction passage and that the open area being increased in a second state where the gaseous fluid has a relatively high flow rate in the suction passage.
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Baker & Botts L.L.P.
Campbell Thor
Sanden Corporation
Walberg Teresa
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