Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Reexamination Certificate
2000-02-25
2001-08-28
Denion, Thomas (Department: 3748)
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
C418S270000, C137S533110, C137S533150
Reexamination Certificate
active
06280166
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a compressor for compressing a gaseous fluid and, more particularly, to a compressor having a valve mechanism in a gas passage for preventing a back flow of the gaseous fluid.
A conventional compressor is disclosed in Japanese Unexamined Patent Publication (JP-A) No. 5-231351. The conventional compressor is generally called a scroll type compressor and is used for circulating a gaseous fluid in an endless circuit. The conventional compressor includes a compressing chamber for compressing the gaseous fluid, a discharge chamber for receiving the gaseous fluid discharged from the compressing chamber, and a gas passage connected between the compressing chamber and the discharge chamber. For preventing a back flow of the gaseous fluid, the compressor is provided in the gas passage with a valve mechanism or a check valve which will later be described in detail in conjunction with the drawing.
The valve mechanism comprises a valve seat and a valve body opposite to the valve seat. When seated on the valve seat, the valve body closes the gas passage. When removed or apart from the valve seat, the valve body opens the gas passage. In the valve mechanism used in the conventional compressor, the valve seat is formed integral with the gas passage. In other words, the gas passage is made or worked to have the valve seat as a part thereof.
In order to prevent the back flow of the gaseous liquid by the valve mechanism, it is necessary to make the valve seat have high accuracy. However, it is difficult or hard to make the valve seat in high accuracy because the valve seat is formed integral with the gas passage.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a compressor having a valve mechanism of relatively high accuracy.
Other objects of the present invention will become clear as the description proceeds.
According to the present invention, there is provided a compressor which comprises a gas passage having a first and a second end portion opposite to each other and being for conducting a gaseous fluid from the first end portion to the second end portion, a valve seat member press-fitted into the first end portion to define a valve chamber in the gas passage, a valve body movably placed in the valve chamber for checking a back flow of the gaseous fluid only when the valve body is seated on the valve seat member, and a valve stopper formed at the second end for preventing a displacement of the valve body without closing the gas passage.
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patent: 4601305 (1986-07-01), Nordskog
patent: 4633681 (1987-01-01), Webber
patent: 6098958 (2000-08-01), Becker
patent: 966387 (1975-04-01), None
patent: 5-231351 (1973-09-01), None
patent: 55-139566 (1980-10-01), None
patent: 57-057967 (1982-04-01), None
patent: 9-273489 (1997-10-01), None
Baker & Botts L.L.P.
Denion Thomas
Sanden Corporation
Trieu Theresa
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