JPS6033453A - Refrigeration equipment - 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 mentioned above, in the refrigeration cycle of a refrigerator using a rotary compressor, when the compressor is stopped, hot gas is prevented from flowing into the evaporator from the high pressure side, reducing power consumption and further reducing the starting load of the compressor. In order to reduce the weight of the compressor, a differential pressure valve is used as a balance valve in order to quickly balance the pressures between the high pressure side and the low pressure side of the compressor without consuming 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, 4 is an evaporator, 5 is a refrigerant control on-off valve, and 6 is a check valve, which are connected in sequence to form a refrigeration cycle. 7 is a differential pressure valve, which consists of a high pressure chamber 7H and a low pressure chamber 7L each having a valve, and a balance pipe 8 connects the sun entry side 7X of the high pressure chamber 7H and the population side 5a of the refrigerant control valve.
The outlet side 7y of the high pressure chamber 7H 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 The chamber 7L is connected to form a balance piping path between the high pressure side and the low pressure side.

Next, the operating principle of the differential pressure valve 7 will be explained from FIG. 2. The differential pressure valve 7 includes a container 7a, a diaphragm 7d that partitions the inside of the container into a high pressure chamber 7H and a low pressure chamber 7L, and 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 artificial vibrator 7x of the high pressure chamber 7H, an outlet vibrator 7 of the high pressure chamber 7H
y, consists of a pressure introduction pipe 7z for the low pressure chamber,
Pdl the pressure inside the inlet vibe 7x, pressure introduction pipe 7z
Assuming that the pressure inside is Pd2, when Pd+≦Pd2, the valve seat 7C is closed by the valve 7b, for example, Pdl P(
The spring 7f is adjusted so that the valve seat 7C is opened when 11≧I Kg'ctl.

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 1, and cooling operation is started. At this time, since the refrigerant control on-off valve 5 is open, the pressures Pdl and P(& in the inlet vibrator 7X of the differential pressure valve 7 and the pressure introduction pipe 7z are approximately equal, and the valve seat 7C is closed by the valve 7b. The balance piping path from the inlet side 5a of the refrigerant control on-off valve 5 to the suction side 1a of the compressor 1 via the differential pressure valve 7 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 vessel 4. The internal pressure on the inlet side 5a of the refrigerant control on-off valve 5 substantially maintains the high pressure of the condenser 2.

Here, there is a pressure difference that operates the differential pressure valve 5, for example, Pd+pd.
2-? l is generated and the valve seat 7C is opened. By opening the valve seat 7C, the balance pipe 8. The outlet of the condenser 2, which is the high pressure side, via the differential pressure valve 7 and the balance pipe 9,
The suction side 1a of the compressor 1, which is the low pressure side, quickly achieves gas balance. At this time, the suction side of the compressor 1 that is balanced on the high pressure side is between the compressor 1 and the check valve 6.
From evaporator 4 to evaporator 4, there is no inflow of hot gas and low pressure is maintained.

As described above, according to the present invention, by using the refrigerant control on-off valve 5 and the differential pressure valve 7 in combination during the refrigeration cycle, hot gas inflow from the high pressure side to the low pressure side is prevented 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 to reduce the starting l/lux of the compressor 1. It is possible to reduce the size of the engine and the cost of the starting device. In addition, as a method for making the present invention more reliable, by using a capillary tube with a large pressure reduction effect as the balance pipe 9, it is possible to reduce the gas flow noise when the high pressure side and the low pressure side are balanced. Furthermore, by arranging the capillary tube in a heat exchange manner with a high-temperature part on the high-pressure side, such as an inlet vibrator of a condenser, the liquid refrigerant is not returned to the compressor when the high-pressure side and the low-pressure side are connected.
It is possible to eliminate adverse effects on the compressor.

Effects of industrial inventions] According to the present invention, during intermittent operation of the refrigeration cycle.

When the compressor is stopped, 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 quickly balances the gas between the high-pressure side and low-pressure side of the compressor. Therefore, it is possible to reduce power consumption, reduce the starting torque of the compressor, and further downsize the compressor.

[Brief explanation of drawings]

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. 1... Compressor, 2... Condenser, 3... Pressure reduction device,
4... Evaporator, 5... Refrigerant control on-off valve, 6... Check valve, 7... Differential pressure valve.

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. Equipped with a refrigerant control on-off valve that closes when the machine is stopped. The low pressure chamber of a differential pressure valve having a high pressure chamber and a low pressure chamber is connected and communicated with the outlet side of the refrigerant control on-off valve, and the high pressure chamber is interposed and connected between the inlet side of the refrigerant control on-off valve and the suction side of the compressor. A refrigeration system characterized in that a differential pressure valve is provided as a balance valve between a high pressure side and a 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. Refrigeration according to claim 1, characterized in that the piping connecting the balance valve and the suction side of the compressor is a capillary tube, and the capillary tube and the discharge side pipe of the compressor are arranged for heat exchange. Device. 4. The refrigeration system according to claim 1, wherein the compressor is a rotary compressor.