US 6,883,346 B2 · Freezer

Abstract

In a refrigerating apparatus (1) having application-side heat exchangers (41, 45, 51) for a plurality of systems for air-conditioning, for cold-storage/freezing and the like and a four-way switch valve (3C) and a plurality of check valves (7) on suction sides of compression mechanisms (2D, 2E) and formed from three compressors (2A, 2B, 2C) to allow the operation states to be switched, the number of compressors (2A, 2B, 2C) used at air-conditioning side and cold-storage/freezing side is limited to two at maximum, thereby achieving a simple circuit configuration in which the number of the check valves (7) to be provided in the suction sides of the compression mechanisms (2D, 2E) is reduced to one or two, suppressing the occurrence of chattering noise in check valves (7) and, also, preventing an ability from reducing due to a suction-side pressure loss.

Claims8

Dependent claims

A refrigerating apparatus wherein compression mechanisms of a refrigerant circuit having application-side heat exchangers of a plurality of systems are formed by combining three compressors, a four-way switch valve is connected to the suction sides of the compression mechanisms, and the four-way switch valve can switch between a first state where a first port is communicated with a second port and a third port is communicated with a fourth port and a second state where the first port is communicated with the fourth port and the second port is communicated with the third port, comprising:

a branch pipe of a suction pipe of a first compressor is connected to the first port through a check valve for permitting a flow of a refrigerant directed to the first port;
a suction pipe of a second compressor is connected to the second port;
a branch pipe of a suction pipe of a third compressor is connected to the third port through the check valve for permitting the flow of a refrigerant directed to the third port;
and
a high-pressure side pipe of the refrigerant circuit is connected to the fourth port.

2 more elements

The refrigerating apparatus wherein compression mechanisms of a refrigerant circuit having application-side heat exchangers of a plurality of systems are formed by combining three compressors, a four-way switch valve is connected to suction sides of the compression mechanisms, and the four-way switch valve can switch between a first state where a first port is communicated with a second port and a third port is communicated with a fourth port and a second state where the first port is communicated with the fourth port and the second port is communicated with the third, comprising:

a branch pipe of a suction pipe of the first compressor is connected to the first port;
a suction pipe of a second compressor is connected to the second port
a branch pipe of a suction pipe of a third compressor and a high-pressure side pipe of the refrigerant circuit are merged and connected to the third port, a check valve for checking the flow of a refrigerant directed to the third port is connected to the branch pipe, and an open/close valve is connected to the high-pressure side pipe;
and
a high-pressure side pipe of the refrigerant circuit is connected to the fourth port, and the high-pressure side pipe is provided with the check valve for checking the flow of a refrigerant directed to the fourth port.

2 more elements

Dependencies are inferred from the claim text.

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Abstract

Claims8