JPS5899657A - 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 The present invention relates to a refrigeration system using a rotary compressor.

In the refrigeration cycle of refrigerators and other devices that use a high-pressure container-type rotary compressor, when the rotary compressor is stopped, excessive superheat gas that remains in the closed container flows into the evaporator and heats the evaporator. It has the disadvantage that it becomes a heat load and inevitably increases the amount of power consumption.

2Y112・The flow has two paths, and the first circuit is a line path through which the superheat gas flows into the cylinder chamber via the mechanical sheath of the compression element, and flows into the evaporator via the suction line.
The second circuit is a circuit in which the gas flows from the closed container to the condenser, radiates heat in the condenser, becomes superheated gas at room temperature, and flows into the evaporator via the capillary cheep.

Therefore, in order to prevent superheated gas from flowing into the evaporator from the high-pressure side and the low-pressure side, a fluid control valve uses the fluid pressure within the system to achieve this purpose without using electromagnetic valves that consume electricity. has been proposed, but fluid control f! 14 Those with two internal valve devices, a differential pressure valve and a check valve, are large in size, and those with a check valve in the suction line are unstable in operation due to unstable piping installation. It is predicted that 2. Furthermore, in the case of a differential pressure type fluid control valve, it is advantageous from the viewpoint of operating speed to communicate the low pressure chamber of the fluid control valve with as close as possible to the cylinder chamber in the rotary reactor/breather.

The present invention has been developed in view of the above points, and includes a low-pressure side check valve provided in the suction passage in the low-pressure three-bage tally compressor, and a conduit connecting the suction passage between the low-pressure side check valve and the cylinder chamber. It communicates with the low pressure chamber of the differential pressure type fluid control valve,
The purpose of the compressor is to provide high operating speed, reliable operation, and to reduce the size of the fluid control valve and simplify piping by providing a check valve within the compressor.

An embodiment of the present invention will be described below with reference to the drawings.

1 is a differential pressure type fluid control valve (hereinafter simply referred to as a fluid control valve), 2 is a high-pressure container type rotary compressor, 3 is a condenser, 4 is a pressure reducer, and 5 is an evaporator, which are the main elements of the cooling system.

Next, the configuration of the fluid control valve 1 will be explained.

6 is a first housing, holder is a second housing, 8 is an inlet vibrator, 9 is an outlet vibrator, and 1o is a first communication pipe. A substantially cylindrical recess 11 is formed in the first housing 6, a first valve seat 12 is formed in the center of the bottom of the recess 11, and an inlet boat 13 is also provided around the bottom. . Further, a threaded portion 14 is formed in the opening of the recess. A second valve seat 15 is formed on the upper surface of the second housing, and the outer peripheral portion of the valve seat 16 holds one end of a spring 16, and the other end of the spring 16 is in contact with a ball valve 17. Further, a fitting portion 7a is formed on the upper outer periphery of the second nozzle 7 so as to fit into the recess 11 of the first nozzle 6, and the lower circumferential portion of the fitting portion 7& is formed with the first nozzle 7a. 7. Threaded part 1 that screws into threaded part 14 of housing 6
4' is formed. The first housing 6, the ball valve 17, and the second housing 7 form a low pressure chamber 6a. Further, the inlet vibrator 8 is connected to the inlet port 13 of the first housing, the outlet vibrator 9 is connected to the port 12' of the first valve seat 12, and the conduit 10 is connected to the port 15' of the second valve seat 16. (hereinafter referred to as the first communication pipe 1o) are connected to each other. The inlet vibrator 8 is connected to the condenser 3 outlet of the high pressure circuit A, and the outlet vibrator 9 is connected to the pressure reducer 4. Next, the configuration of the rotary compressor 2 will be explained. 18 is a closed container;
It contains an electric six-page element (not shown) and a compression element 19 inside.

The compression element 19 is connected to the cylinder 20. Main bearing 21. Secondary bearing 2
2. a roller 24 rotatably provided on the shaft 23;
A cylinder chamber 25 is constituted by a vane (not shown) that slides in close contact with the roller 24. In addition, a low pressure side check valve 28 is installed in the suction passage 27 between the suction pipe 26 and the cylinder chamber 26.
A second communication pipe 29 communicates between the low pressure side check valve 28 and the cylinder chamber, and is connected to the first communication pipe 1o of the fluid control valve 2. 3o is a discharge pipe.

Next, the operation of the fluid control valve 1 having the above configuration in a refrigeration cycle will be explained.

During operation of the rotary compressor 2, the high pressure circuit A is at high pressure and the low pressure circuit B is at low pressure, so that the inlet vibe 8 and the inlet port 13 are at high pressure, and the upper surface of the Beball valve 17 is also at high pressure. At the same time, the first communication pipe 1G communicating with the suction passage 27 of the rotary compressor 2 and the port 16' of the second valve seat 16 also become under low pressure.
The lower surface of the ball valve 7 becomes a low pressure, and the pressure difference due to this pressure difference overcomes the biasing force of the spring 16, forcing the ball valve 17 to slide downward, and being pressed by the second valve seat 15, the first The port 12' of the valve seat 12 is opened, and the port 15' of the second valve seat 15 is closed, so that the refrigerant flows from the rotary compressor 2 to the condenser 3 to the inlet port 13 to the port 12 of the first valve seat 12. The refrigerant flows from the pressure reducer 4 to the evaporator 6, and this refrigerant opens the check valve 28 in the rotary compressor 2 to perform normal refrigeration. At this time, the ball valve 1 of the fluid control valve 1 is pressed by the second valve seat 16, and the port 15' of the second valve seat 15 is closed, so the high pressure circuit A is connected to the low pressure circuit through the fluid control valve 1. The flow to B has been prevented. Next, when the rotary compressor 2 stops, high-pressure gas flows back through the mechanical seal of the compression element 19 of the compressor 2, but the back pressure caused by the high-pressure gas flowing back into the suction passage 27 causes the low-pressure side check valve to 28 is closed. After the check valve 28 is closed, the high pressure gas in the cylinder chamber 25 and the suction flow path 27 is transferred to the second communication pipe 29 connected between the low pressure side check valve 28 and the cylinder chamber 25, and to the first communication pipe 29. The pressure inside the boat 15' of the second valve seat 16 of the fluid control valve 1, which flows into the pipe 10 and communicates with it, is also high, and the pressures acting on the upper and lower surfaces of the ball valve 17 are almost equal. Acting spring 1
The biasing force of 6 becomes large, forcing the ball valve 17 to slide upward and press against the first valve seat 12, thereby closing the high pressure circuit A. That is, the high pressure circuit A is completely closed by the fluid control valve 1, and the low pressure circuit B is completely closed by the low pressure side check valve 28, so that superheated gas is prevented from flowing into the evaporator 6.

As is clear from the above description, the refrigeration system according to the present invention includes a condenser, a pressure reducer such as a cavity cheep, an evaporator,
A rotary compressor and a differential pressure type fluid control valve are provided, and a low pressure side check valve is provided in the suction passage in the rotary compressor, and a conduit connects the suction passage between the low pressure side check valve and the cylinder chamber to the differential pressure type fluid control valve. This is connected to the low pressure chamber of the control valve. When the rotary compressor is stopped, the high pressure gas in the suction flow path is directly introduced into the low pressure chamber of the fluid control valve via a conduit, so the operation speed is fast and the operation is fast. is reliable, and by providing a check valve in the compressor, the fluid control valve can be made smaller and the piping can be simplified.

[Brief explanation of drawings]

FIG. 1 shows a sectional view of a fluid control valve according to an embodiment of the present invention and a diagram of a refrigeration cycle incorporating the valve, and FIG. 2 shows a sectional view of a rotary compressor. A: High voltage circuit, B: Low voltage circuit, 1
... Differential pressure type fluid control valve, 2 ... Rotary compressor, 3 ... Condenser, 4 ...
...Pressure reducer, 5...Evaporator, 6a...
Low pressure chamber, 25...Cylinder chamber, 27...
・Suction flow path, 28...Low pressure side check valve, 1o...
... Conduit (first communication pipe). Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 112

Claims (1)

[Claims] It is equipped with a condenser, a pressure reducer such as a capillary cheep, an evaporator, a rotary compressor, and a differential pressure type fluid control valve. A refrigeration system in which a suction flow path between a low-pressure side check valve and a cylinder chamber is communicated with a low-pressure chamber of the differential pressure type fluid control valve through a conduit.