Heat pump system with high efficiency reversible helical screw rotary compressor
US4058988A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 29, 1976 |
| Grant date | Nov 22, 1977 |
| Priority date | — |
| Expiry date | Jan 29, 1996 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25B2400/13
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A helical screw rotary compressor is provided with oppositely oriented slide valves at the suction and discharge sides of the machine to control compressor capacity and balance the closed thread pressure at discharge with discharge line pressure in a main closed loop heat pump refrigeration system. The compressor may be bidirectional if the function of the slide valves is reversed. Additional slide valves carried by the compressor may be employed to vary the injection point of intermediate pressure refrigerant gas to a compressor closed thread and to control flow to and/or from closed threads and a secondary loop for subcooling the main loop refrigerant or for other functions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.