| 摘要 |
PCT No. PCT/SE86/00202 Sec. 371 Date Dec. 29, 1986 Sec. 102(e) Date Dec. 29, 1986 PCT Filed May 2, 1986 PCT Pub. No. WO86/06798 PCT Pub. Date Nov. 20, 1986.A refrigeration type plant comprises a rotary, positive displacement machine which as at least one rotor provided with spiral lobes and intervening grooves. The plant further comprises a condenser communicating with an outlet port (60) of the compressor through a high pressure channel (14), an evaporator communicating with an inlet port (58) of the compressor through a low pressure channel (18), a vessel for an intermediate pressure communicating with an intermediate port (38) of the compressor through an intermediate pressure channel (36), the intermediate port (38) being spaced from the inlet port (58) as well as from the outlet port (60), and a pressure reducer for decreasing the high pressure in the condenser to the intermediate pressure in the vessel and to the low pressure in the evaporator, respectively. A selectively adjustable valve (40) is provided for forming a communication between the intermediate channel (36) and the low pressure channel (18). |
