Compressor unloading control |
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| 申请号 | US3788776D | 申请日 | 1972-08-10 | 公开(公告)号 | US3788776A | 公开(公告)日 | 1974-01-29 |
| 申请人 | GARDNER DENVER CO; | 发明人 | POST R; HERSCHLER M; | ||||
| 摘要 | An unloading control arrangement for a liquid injected air compressor of the type which includes a pneumatically operated inlet throttling valve, a liquid separator-reservoir tank, and compressed air storage means. A pressure responsive switch connected to the compressed air storage means is operative, at a predetermined pressure condition, to actuate a single power operated valve which vents the separator-reservoir tank and causes the inlet throttling valve to reduce inlet air flow to the compressor. A vent line connected to the power operated valve includes a flow restrictor of suitable size to provide for a low residual pressure in the reservoir tank to insure adequate liquid circulation during compressor unloaded operation. | ||||||
| 权利要求 | 1. In combination: a gas compressor including gas inlet and discharge means; gas storage means connected to said discharge means for receiving and storing compressed gas; a check valve between said discharge means and said storage means for substantially preventing backflow of gas from said storage means to said discharge means; a compressor inlet throttling valve connected to said inlet means and including a closure member and pressure fluid actuating means for moving said closure member to throttle inlet gas flow to said compressor; and an unloader control system characterized by: a conduit interconnecting said discharge means and said actuating means; power operated valve means interposed in said conduit between said discharge means and said actuating means; pressure responsive means in communication with said storage means for operating said valve means to open in response to a predetermined pressure in said storage means; and, vent means connected to said conduit between said valve means and said actuating means for controlled venting of said discharge means to a gas pressure in said discharge means which is less than the gas pressure in said storage means in response to opening of said valve means. 2. The invention set forth in claim 1 wherein: said vent means includes conduit means connected to said conduit between said valve means and said actuating means and including means for controlling the venting of said discharge means in response to the opening of said valve means. 3. The invention set forth in claim 2 wherein: said inlet throttling valve includes a housing including an inlet opening, a chamber, and piston means disposed in said chamber and movable in response to the admission of pressure fluid to said chamber to move said closure member to throttle inlet gas flow to said compressor, and said conduit opens into said chamber for admitting gas from said discharge means to exert a pressure force on Said piston means. 4. The invention set forth in claim 3 together with: biasing means for biasing said piston means to move against the pressure force exerted on said piston means by said gas in said chamber. 5. The invention set forth in claim 3 wherein: said means for controlling the venting of said discharge means comprises restricted passage means of a predetermined size which will control the venting of said discharge means to provide a reduced pressure in said conduit and said chamber for moving said closure member to a position which will provide for a reduced inlet gas flow to said compressor. 6. The invention set forth in claim 5 wherein: said restricted passage means opens into said inlet opening in said housing. 7. The invention set forth in claim 1 wherein: said compressor is liquid injected, said discharge means includes a gas-liquid separator tank and said vent means is operable to vent said tank to a reduced presssure less than said predetermined pressure in response to the opening of said valve means. |
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