Modular unload slide valve control assembly for a helical screw rotary compressor
US4508491A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 22, 1982 |
| Grant date | Apr 2, 1985 |
| Priority date | — |
| Expiry date | Dec 22, 2002 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C28/125
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A modular three block assembly provides unloading control for a hydraulic cylinder functioning to variably position a slide valve on a helical screw rotary compressor. A first compressor block is fixedly and sealably mounted within the hermetic compressor outer casing and has through holes leading to a first tube connected to a source of oil under discharge pressure forming the hydraulic fluid for the hydraulic cylinder, a second tube connected to the hydraulic cylinder and a third tube to the suction tube returning low pressure vapor to the compressor suction side. A needle valve block is fixedly mounted to the external face of the compressor block and bears within longitudinal through passages paired needle valves determining the load and unload flow rates for the hydraulic fluid passing through said compressor block through holes. A solenoid valve block face connected to the needle valve block carries a three position solenoid valve assembly for controlling flow through the various passages leading to the internal tubes. Flow distribution plates of gasket material are interposed between the blocks at the block interfaces to seal the block interfaces and to provide lateral flow d…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.