초록 ▼

There is disclosed a multi-stage compressing refrigeration device for multi-stage compressing a refrigerant using a plurality of compressing means. Its object is to enhance reliability, intend to reduce input and improve refrigeration effect, and to enhance efficiency. In the multi-stage compressing

There is disclosed a multi-stage compressing refrigeration device for multi-stage compressing a refrigerant using a plurality of compressing means. Its object is to enhance reliability, intend to reduce input and improve refrigeration effect, and to enhance efficiency. In the multi-stage compressing refrigeration device, low-stage compressing means and high-stage compressing means, a condenser, first expanding means, an intermediate evaporator, second expanding means and a main evaporator constitute a refrigeration cycle. The refrigerant flowing out of the condenser is branched into one refrigerant passed to the intermediate evaporator via the first expanding means and the other refrigerant passed to the main evaporator via the second expanding means. Heat exchange is performed between the refrigerant flowing into the second expanding means and the intermediate evaporator. Additionally, the refrigerant flowing out of the main evaporator is sucked by the low-stage compressing means, and the refrigerant flowing out of the intermediate evaporator is sucked by the high-stage compressing means together with the refrigerant discharged from the low-stage compressing means.

대표청구항 ▼

[ What is claimed is:] [1.] A multi-stage compressing refrigeration device comprising:a compressor having a drive means, at least a low-stage refrigerant compressing means and a high-stage refrigerant compressing means simultaneously driven by said drive means in a closed container,a refrigeration f

[ What is claimed is:] [1.] A multi-stage compressing refrigeration device comprising:a compressor having a drive means, at least a low-stage refrigerant compressing means and a high-stage refrigerant compressing means simultaneously driven by said drive means in a closed container,a refrigeration flow passage to convey the refrigerant compressed by said low-stage compressing means out of said closed container to said high-stage compressing means in said closed container,a condenser to receive and cool the refrigerant compressed by said high-stage compressing means,an intermediate evaporator receiving from the condenser a part of the refrigerant cooled down by said condenser via first expanding means and receiving directly the other part of the cooled down refrigerant;a second expanding means for receiving the refrigerant from said intermediate evaporator;a main evaporator to receive the refrigerant from said intermediate evaporator via said second expanding means to be evaporated and supply the evaporated refrigerant back into said low-stage compression means, whereinthe expanding ratio of said first expanding means is set to maximize the result coefficient of the refrigeration device.