JPS6048460A - 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 cycle using a refrigerant control valve and a two-way differential pressure valve, and is particularly suitable for reducing power consumption of the refrigeration cycle. . Further, since the differential pressure two-way valve does not need to be equipped with a soundproofing device, it is suitable for cost reduction.

[Prior art]

Conventionally, in this type of refrigerator, the temperature inside the refrigerator is controlled by intermittent operation of a compressor forming a cooling system using a temperature detection thermostat provided inside the refrigerator. In particular, when using a low-pressure compressor, the weight of the refrigerant on the high-pressure side is large, so when the compressor is stopped, pot gas flows into the evaporator from the high-pressure side, resulting in the evaporator temperature rising by 1. This creates a heat load and increases power consumption.

Therefore, as a preventive measure, a refrigerant control valve is installed between the high-pressure side and the low-pressure side to prevent hot gas from flowing into the evaporator from the high-pressure side while the compressor is stopped. Hot gas flowing back into the evaporator is blocked by a check valve I installed between the evaporator and the compressor. In such a refrigeration cycle, if there is little hot gas leaking from the high-pressure side to the low-pressure side when the compressor is stopped, the pressure balance between the high-pressure side and the low-pressure side will be poor, and the load on the compressor will increase when the compressor is restarted.
A compressor with high starting torque is required.

In this way, in conventional refrigeration cycles, even if gas is prevented from flowing into the evaporator from the high pressure side when the compressor is stopped,
As the coefficient of performance of rotary compressors increases, leakage between the high-pressure side and the low-pressure side inside the compressor decreases, resulting in the disadvantage that the starting torque of the compressor must be increased.

In addition, the refrigerant control valve installed to prevent the inflow of hot gas is generally a solenoid valve, requires electric power, or generates impact noise, which increases power consumption. However, there were drawbacks such as the installation of soundproofing equipment.

[Purpose of the invention]

The present invention focuses on this type of problem, and provides a refrigeration system that improves the above-mentioned drawbacks, reduces power consumption, downsizes the compressor, simplifies the starting device, reduces cost, and reduces noise. There is a particular thing.

[Summary of the invention]

As mentioned above, in a refrigerator refrigeration cycle equipped with a rotary compressor, electromagnetic technology is used to quickly balance the pressure between the high-pressure side and the low-pressure side of the compressor in order to reduce the load when restarting the compressor. As a method of reducing power consumption by using a two-way valve or instantaneous energization valve and further preventing hot gas from flowing into the evaporator from the high pressure side when the compressor is stopped,
It uses a differential pressure two-way valve that operates by detecting changes in the pressure between the compressor suction port and the check valve.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be explained with reference to Figs. 2 to 5. -01 is a compressor, 2 is a condenser, 3 is a pressure reducer, 4 is an evaporator, and 5 is a check valve, which are connected in sequence. make up the refrigeration cycle. Reference numeral 6 denotes a refrigerant control valve, which is an instantaneous energization valve that uses a two-way electromagnetic valve or a permanent magnet and does not require electrical input after activation, and is connected to the discharge side and suction side of the compressor through a bypass pipe 7. has been done. Reference numeral 8 is a differential pressure type two-way valve consisting of a high pressure chamber 8H and a low pressure chamber 8L each having a valve, and a communication pipe 9 connects the population 8Z of the low pressure chamber 8L with the compressor suction port and the check valve. The inlet 8X and the condenser outlet are connected by a refrigerant pipe, and the high pressure chamber outlet 8y and the pressure reducer port are connected by a refrigerant pipe.

Next, the principle of operation of the differential pressure three-way valve 8 will be explained with reference to FIG. The differential pressure two-way valve 8 includes a container 8a, a diaphragm 8d that partitions the container 8a into a high pressure chamber 8H and a low pressure chamber 8L, and a diaphragm 8d.
A stopper 8e and a control ball 81) fixed to the high pressure chamber side surface of the
, bow 1-8c, spring 8f that determines the opening/closing operating value,
It is composed of a pressure introduction pipe 8Z of the low pressure chamber 8L, an artificial vibrator 8X of the high pressure chamber 8H, and a high pressure chamber exit vibe 8y.If the pressure of the pressure introduction pipe 8Z is ps, and the pressure of the high pressure chamber inlet vibe 8x is pc, then If the operating value po satisfies the relationship of Pc-Ps≦po and the above-mentioned relational expression is satisfied, the port 8c is closed, and if pc-pS>po.

The boat 8c is designed to open, and Po is adjusted by a spring 8f.

The operation of the refrigeration cycle made up of such components will be explained with reference to FIG.

First, during operation, the refrigerant control valve 6, such as an electromagnetic two-way valve or an instantaneous energization valve, is closed in synchronization with the operation of the compressor 1, and the refrigerant circulates within the cycle. At this time, check valve 5
Since the pressure circle between and the compressor 1 becomes low pressure, the low pressure chamber 8L of the differential pressure three-way valve 8 also becomes ps, and at this time, the high pressure chamber 8H
The pressure pc of population 8X gradually rises to -Ps -Ps
> When Po, the spring 8f is pushed down by -1-,
□At the same time, diaphragm 8d, stopper 8e, control ball 3
b is also pushed up, 2-ball l-8c is opened, and the refrigerant flows from 8X to 8y within the differential pressure two-way valve.

Next, we will explain when to stop. The internal temperature controller opens the refrigerant control valve 6 at the same time as the compressor 1 stops, and high-pressure gas flows between the compressor suction [1 and reverse 1 and the valve 5], and flows between the compressor discharge port and the compressor. The suction port quickly balances pressure. Furthermore, the high pressure gas at this time also flows into the low pressure chamber 8L of the differential pressure two-way valve 8 through the communication pipe 9, and the - of the diaphragm 8d.
It falls on the face.

Therefore, the diaphragm 8d is pushed down when pc-ps≦PO, and at the same time the pad 3e and the control ball 81
] is also pushed down and the port 8C is shut off.

By performing this operation quickly, pot scum on the high pressure side, that is, in the compressor and condenser, is prevented from flowing into the evaporator. Therefore, the high pressure state and low pressure state of the refrigeration cycle are maintained by the differential pressure two-way valve and check valve mentioned above, and
The suction and discharge ports of the compressor (also balance the pressure).

As described above, according to the present invention, by using the refrigerant control valve 6 and the differential pressure two-way valve in combination in the refrigeration cycle,
When the compressor is stopped during intermittent operation, hot gas is prevented from flowing from the high-pressure side to the low-pressure side, reducing power consumption.Furthermore, the suction side and discharge side of the compressor 1 are perfectly balanced in pressure. By doing so, the starting torque of the compressor can be reduced, thereby making it possible to downsize the compressor and reduce the cost of the starting device.

In addition, by providing a second check valve between the bypass pipe branch port on the compressor discharge side and the condenser, when the internal volume on the low pressure side of the compressor is large, it is possible to Even if the balance pressure on the side increases, the refrigerant in the condenser will not flow back and the pressure can be maintained at a high pressure, and the liquid refrigerant inside the condenser will be maintained without evaporating, and the Since the liquid refrigerant quickly flows into the pressure reducer upon restart, cooling begins quickly.

Also, the refrigerant control valve 6, the compressor suction port and the low pressure side check valve 5
By providing a capillary tube in the bypass pipe 7 that connects the two, it is possible to reduce the refrigerant noise that occurs when the pressures are balanced between the suction side and the discharge side of the compressor after the compressor is stopped.

〔Effect of the invention〕

According to the present invention, in a refrigeration cycle that performs intermittent operation, the pressure on the suction side and the discharge side of the compressor are balanced by opening the refrigerant control valve while the compressor is stopped, thereby reducing the starting torque of the compressor and compressing It is possible to downsize the machine and reduce the cost of the starting device.

Furthermore, by operating the differential pressure three-way valve by taking advantage of the fact that the pressure increases between the compressor suction port and the low-pressure side check valve when the compressor is stopped, hot gas flows from the high-pressure side to the low-pressure side. Since it is possible to prevent heat load from entering the refrigerator, power consumption can be reduced by 15 to 20%.

Furthermore, since differential pressure two-way valves do not require electrical input, they can further reduce power consumption compared to electromagnetic two-way valves.

Furthermore, since no impact noise is generated during operation, there is no need to install a soundproofing device, and costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional refrigeration cycle. 2nd, 3rd
The figure is a configuration diagram of a refrigeration cycle of a refrigeration system according to the present invention. FIG. 4 is a sectional view of the differential pressure two-way valve. FIG. 5 is a diagram schematically showing the operations of the compressor, refrigerant control valve, and differential pressure one-way valve. 1... Compressor, 2... Condenser, 3... Pressure reducer, 4
・Evaporator, 5.. Low pressure side check valve, 6.. Refrigerant control valve,
7. Bypass pipe, 8 Differential pressure two-way valve, 9 Communication pipe, 10
...High pressure side check valve, 11...Capillary tube, 8a--Differential one-way valve container, 8b...Controller, 8c Boat, 8d,...Diaphragm, 8e...Batch, 8f...Spring, 8H
・・・High pressure chamber, 8L・Low pressure chamber, 8X・・・Inflow “1.B
Y...n, 1 Dehi, 8Z...Communication tube population. Representative Patent Attorney Akio Takahashi $1 Figure 2 Figure '$, 3 (2) '$4 Figure

Claims (1)

[Scope of Claims] 1. In a refrigeration cycle in which a compressor, a condenser, a pressure reducer, an evaporator, and a check valve are sequentially connected, the refrigerant pipe between the compressor discharge port and the condenser inlet is connected to the compressor. A bypass pipe is provided between the suction port and the check valve, and a refrigerant control valve is provided between the bypass pipe, which is closed when the compressor is operating and opened when the compressor is stopped.
Furthermore. A differential pressure two-way valve is installed between the condenser and the pressure reducer to detect the refrigerant pressure between the compressor and the check valve, and the refrigerant pressure is lower than the refrigerant pressure at the condenser outlet by a predetermined value -1 A refrigeration system characterized in that when the differential pressure is lower than a predetermined value, the refrigerant flow path of the differential pressure two-way valve is closed, and when the differential pressure is smaller than a predetermined value, the refrigerant flow path of the differential pressure two-way valve is opened. 2. The refrigeration system according to claim 1, wherein the refrigerant control valve is an instantaneous energization valve or a solenoid valve. 3. The refrigeration system according to claim 1, wherein the compressor is a rotary compressor. 4. The refrigeration system according to claim 1, further comprising a check valve between the bypass pipe branch on the discharge side of the compressor and the condenser. 5. The refrigeration system according to claim 1, wherein a capillary tube is installed between the refrigerant control valve and a bypass pipe 7 that connects between the compressor suction port and the check valve.