JPS6030962A - Refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a refrigeration system in which a refrigerant control valve is provided in the main circuit of a refrigeration cycle, and a differential pressure valve is provided as a balance valve between a high pressure side and a low pressure side. .

[Prior art]

Especially when a rotary compressor is used in a refrigerator, etc., which is equipped with a conventional refrigeration cycle consisting of a compressor, condenser, pressure reducing device, and evaporator, and in which the compressor is operated intermittently by an automatic temperature controller inside the refrigerator. Since the internal volume on the high-pressure side is large, hot gas flows into the evaporator from the high-pressure side when the compressor is stopped during intermittent operation, raising the evaporator temperature and increasing power consumption. Therefore, as a preventive measure, a refrigerant control on-off valve is installed between the high-pressure side and the low-pressure side that is linked to the on/off of the compressor to prevent hot gas from flowing into the evaporator from the high-pressure side when the compressor is stopped. A check valve installed between the evaporator and the compressor shuts off hot gas flowing into the evaporator via the compressor. In such a refrigeration cycle, if there is little hot gas leaking from the high-pressure side to the low-pressure side via the compressor when the compressor is stopped, the pressure balance between the high-pressure side and the low-pressure side will be poor and the pressure will be applied to the compressor when the compressor is restarted. The load becomes larger, and a compressor with larger starting torque is required. In this way, in conventional refrigeration cycles, hot gas is prevented from flowing into the evaporator from the high pressure side when the compressor is stopped, but as the performance of rotary compressors improves, the high pressure side and low pressure side However, if leakage is reduced, the starting torque of the compressor must be increased.

[Purpose of the invention]

An object of the present invention is to improve the above-mentioned drawbacks, reduce power consumption, downsize the compressor, and simplify the starting device.

[Summary of the Invention] As described in iii. above, in the refrigeration cycle of a refrigerator using a rotary compressor, the present invention aims to reduce power consumption by preventing hot gas from flowing into the evaporator from the high pressure side when the compressor is stopped. Furthermore, in order to lighten the starting load on the compressor, a differential pressure valve is used as a balance valve as a method of balancing the pressures between the high pressure side and the low pressure side of the compressor quickly and without consuming electric power.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. 1 is a compressor, 2 is a condenser, 3 is a pressure reducing device, 41 evaporators, 5
is a refrigerant control on-off valve, and 6 is a check valve.

These are connected in sequence to form a refrigeration cycle. 7
is a differential pressure valve, which is composed of a high pressure chamber 7H and a low pressure chamber 7L each having a valve.The inlet side 7X of the high pressure chamber 7H and the inlet side 2a of the condenser 2 are connected by a balance pipe 8, and the outlet side 7y of the high pressure chamber 7H is connected to the inlet side 7X of the condenser 2.
and the downstream part 1a of the check valve on the suction side of the compressor are connected by a balance pipe 9, and the outlet side 5b of the refrigerant control on-off valve and the low pressure chamber 7L are connected by a communication pipe 1o to connect the high pressure side and the low pressure side. It constitutes the side balance piping path.

Next, the operating principle of the differential pressure valve 7 will be explained with reference to FIG.

Differential pressure valve 7 (container 7a, the inside of the container is connected to high pressure chamber 7H and low pressure chamber 7
A diaphragm 7d that partitions into L, a valve 7b semi-fixedly connected to the high pressure side of the diaphragm 7d, a valve seat 7c that receives the valve 7b, a spring 7f that determines the operating value, an inlet vibrator 7x of the high pressure chamber 7H, It is composed of an exit vibe 7M and a pressure introduction pipe 7z for the low pressure chamber, and the pressure inside the inlet vibe 7X is set to Pdl, and the pressure inside the pressure introduction pipe 7z is set to Pdz.
Then, when Pd+≦Pd2, the valve seat 7c is closed by the valve 7b, and when, for example, Pdl Pd2≧IKg/cd, the valve seat 7C is held open by the spring 7f.

The operation of the refrigeration cycle made up of such components will be explained below.

First, during operation, the refrigerant control on-off valve 5, for example, an electromagnetic two-way valve, is opened in synchronization with the operation of the compressor, and cooling operation is started. At this time, since the refrigerant control on-off valve 5 is open, the pressures P d+ and P4 in the input pipe 7x of the differential pressure valve 7 and the pressure introduction pipe 7z are approximately equal, and the valve seat 7
C is a balance piping line closed by a valve 7b from the inlet side 2a of the condenser 2 to the suction side 1a of the compressor 1 via the differential pressure valve 7;

1) It is completely closed and there is no problem during cooling operation.

Next, the time of stopping will be explained. When the compressor 1 is stopped by the automatic temperature controller (not shown), the refrigerant control on-off valve 5 is closed at the same time.By closing the refrigerant control on-off valve, the condenser 2 and the pressure reducing device 3 is pressure-blocked, completely preventing hot gas from flowing from the high-pressure side of the condenser 2 to the low-pressure side of the evaporator 4, and at the same time, the internal pressure on the outlet side 5a of the refrigerant control on-off valve 5 rapidly evaporates. The pressure decreases until it becomes equal to the pressure in the condenser 4, and the condenser 2 substantially maintains the high pressure. Here, the pressure difference that operates the differential pressure valve 5, for example, Pdl Pd
2≧1 occurs, and the valve seat 7C is opened. By opening the valve seat 7C, gas is quickly balanced between the outlet of the condenser 2, which is the high pressure side, and the suction side 1a of the compressor, which is the low pressure side, via the balance pipe 8, the differential pressure valve 7, and the balance pipe 9. . At this time, the inlet side 2a of the condenser 2 is in a complete gas state, and no liquid back phenomenon occurs. Further, the suction side of the compressor 1 that is in balance with the high pressure side is between the compressor 1 and the check valve 6, and no hot gas flows from the check valve 6 to the evaporator 4, maintaining a low pressure.

As described above, according to the present invention, by using a combination of the refrigerant control on-off valve 5 and the differential pressure valve 7 during the refrigeration cycle, hot gas flows from the high pressure side to the low pressure side when the compressor 1 is stopped during intermittent operation. In addition, it is possible to completely balance the gas between the high pressure side and the low pressure side of the compressor 1, and the starting torque of the compressor 1 can be reduced. It can be made smaller and reduce the cost of the starting device. In addition, by connecting the balance pipe 8 to the inlet side of the condenser 2 (the part where the refrigerant on the high pressure side is not liquefied) and making it a capillary tube, it is possible to connect the balance pipe 8 to the inlet side of the condenser 2. Even if leakage occurs from the valve part of compressor 1,
Since liquid back does not occur, the compressor 1 is not damaged, and the flow noise of the refrigerant when the high pressure side and the low pressure side are balanced while the compressor 1 is stopped can be reduced.

〔Effect of the invention〕

According to the present invention, when the compressor is stopped during intermittent operation of the refrigeration cycle, the refrigerant control on-off valve prevents hot gas from flowing from the high pressure side to the low pressure side, and at the same time, the differential pressure valve prevents hot gas from flowing into the high pressure side of the compressor. Since the gas balance can be quickly achieved on the low-pressure side, it is possible to reduce power consumption, reduce the starting torque of the compressor, and downsize the compressor.

[Brief explanation of the drawing]

FIG. 1 is a refrigeration cycle configuration diagram of a refrigeration system according to the present invention;
FIG. 2 is a sectional view of a differential pressure valve used as a balance valve. ■... Compressor, 2... Condenser, 3... Pressure reducing device, 4
. . . Evaporator, 5. Refrigerant control on-off valve, 6. Check valve, 7. Differential pressure valve. Representative Patent Attorney Akio Takahashi

Claims (1)

[Claims] 1. In a refrigeration cycle in which a compressor, a condenser, a pressure reducing device, an evaporator, and a check valve are connected in sequence, a compressor is opened between the condenser and the pressure reducing device during operation of the compressor. A refrigerant control on-off valve that closes when the machine is stopped is provided, and a low pressure chamber of a differential pressure valve having a high pressure chamber and a low pressure chamber is connected and communicated with an outlet side of the refrigerant control on-off valve,
A refrigeration system characterized in that a high pressure chamber is interposed and connected between an inlet side of a condenser and a suction side of a compressor, and a differential pressure valve is provided as a balance valve between the high pressure side and the low pressure side. 2. The refrigeration system according to claim 1, wherein the piping connecting the balance valve and the suction side of the compressor is a capillary tube. 3. The refrigeration system according to claim 1, characterized in that the high pressure chamber of the differential pressure valve is interposed and connected between a portion of the high pressure side of the refrigeration cycle where the refrigerant is not liquefied and the suction side of the compressor. . 4. The refrigeration system according to claim 1, wherein the compressor is a rotary compressor.