Scroll-type compressor with variable displacement mechanism
US5993171A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 23, 1997 |
| Grant date | Nov 30, 1999 |
| Priority date | — |
| Expiry date | Jun 23, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C28/12
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A scroll-type variable displacement compressor for use in an air conditioning system of a vehicle has a fixed scroll and an orbiting scroll with a lowered minimum operating capacity. A cylinder is formed within an end plate of the fixed scroll and accommodates a capacity control mechanism and a plurality of pairs of bypass holes which penetrate the end plate of the fixed scroll and the cylinder perpendicularly. Via one of a pair of bypass holes, the cylinder communicates with a compression chamber enclosed by the orbiting scroll and the fixed scroll, and via the other of the pair of bypass holes, the cylinder communicates with a low pressure chamber provided within rear portions of a compressor housing. One portion of the low pressure chamber is always open to the suction chamber. The communication between the cylinder and the low pressure chamber is controlled by the position of a piston slidably accommodated within the cylinder. When the thermal load for the air conditioning system is low, the piston retreats to the recessed position of the cylinder, opening the pairs of bypass holes. By providing the low pressure chamber, an extra branch path for returning refrigerant gas is for…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.