JPH0142791Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a receiver for a cooling device installed in a liquid refrigerant pipe of a car air conditioner, a bus air conditioner, a package air conditioner, or the like.

To explain a conventional example of a car air conditioner, as shown in Fig. 1, a compressor 1 is driven by a vehicle's running engine (not shown) via a V-belt.
The liquid refrigerant discharged from the compressor 1 is circulated back to the compressor 1 via a condenser 3, a receiver 4, an expansion valve 5, and an evaporator 6 via a condenser 2, and the blowing temperature of the evaporator 6 is detected. The capacity of the compressor 1 is controlled by operating an electromagnetic clutch 8 by turning on and off a thermostat 7. In addition, 9a and 9b in the figure are fans for a capacitor and an evaporator.

Further, as shown in FIG. 3, the conventional receiver 4 includes a receiver main body 10, a liquid refrigerant inflow path 1,
1. Suction pipe 1 installed vertically within the receiver main body 10
2. Outflow passage 13 connected to the upper end of suction pipe 12;
The receiver 4 is composed of a strainer 14 and a desiccant 15 provided around the lower opening 12a of the suction pipe 12, and the receiver 4 is interposed in the liquid refrigerant pipe 2 between the condenser 3 and the expansion valve 5. The structure is such that the liquid refrigerant flows through the path shown by the solid line arrow.

However, in the conventional car air conditioner,
The capacity of the compressor 1 is controlled by an electromagnetic clutch 8 by repeatedly turning the thermostat 7 on and off, and when the thermostat 7 is turned off, that is, when the compressor 1 is stopped, the discharge of liquid refrigerant is stopped. However, since cooling air is supplied to the condenser 3 by the rotation of the fan 9a or the vehicle running wind, the pressure of the liquid refrigerant in the condenser 3 is significantly lower than during operation, and as a result, the pressure of the liquid refrigerant in the condenser 3 is significantly lower than that during operation. The liquid refrigerant between the valves 5 flows back to the receiver 4 and further to the condenser 3 as indicated by the dotted line arrow, and a gas phase is generated between the expansion valve 5 and the receiver 4, which causes the compressor 1 to restart. At times, the gas phase flows into the expansion valve 5, and then the gas-liquid two phases flow into the expansion valve 5, and the flow noise in the expansion valve 5 at that time is different from that of the gas phase, gas, gas, and liquid refrigerant during operation. There is a drawback that during liquid two-phase flow B, the noise level becomes significantly louder and reaches about 10 dB, causing discomfort.

The present invention was developed in view of the above-mentioned circumstances, and the point is that, in a receiver installed in a liquid refrigerant pipe, a check valve is provided in the suction pipe of the receiver to prevent backflow. By installing a check valve in the suction pipe of the receiver installed in the liquid refrigerant pipeline, it prevents the backflow of the liquid refrigerant and prevents the generation of a gas phase, eliminating the above-mentioned drawbacks. The present invention provides a receiver for a cooling device.

The present invention has the above-mentioned configuration, and in the receiver installed in the liquid refrigerant pipeline, a check valve for preventing backflow is provided in the suction pipe of the receiver, so that the compressor cannot be operated. When liquid refrigerant is flowing, the check valve automatically opens due to the flow of liquid refrigerant, ensuring the flow of liquid refrigerant, and when the compressor stops, the check valve closes immediately and the liquid The backflow of the refrigerant is blocked and the generation of gas phase in the pipeline is extremely effectively prevented.The structure is extremely simple, with a check valve provided in the suction pipe of the receiver, and has an excellent noise prevention function.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 4 shows an embodiment of the present invention, in which 10 is a receiver body, 11 is a liquid refrigerant inflow path,
12' is a suction pipe vertically installed inside the receiver main body 10;
13 is an outflow path connected to the upper end of the suction pipe 12';
14 is a strainer provided around the lower end opening 12a' of the suction pipe, and 15 is a desiccant housed around the strainer 14. In the receiver of this embodiment, the suction pipe 12 A valve seat 20 is provided at the lower end opening of the suction pipe 1.
A stopper 21 is provided on the inner side of the lower part of the valve seat 20 by dimple processing or the like with an appropriate gap between the valve seat 20 and the suction pipe 1 between the valve seat 20 and the stopper 21.
A valve ball 22 is inserted into the receiver 4' so as to be movable up and down, and a check valve is provided.The receiver 4' is configured to provide a check valve for the liquid refrigerant between the condenser 3 and the expansion valve 5, as shown in FIG. It is used by being inserted in the pipe line 2 etc.

The illustrated embodiment of the present invention has the above-mentioned configuration, and to explain the operation and effect, when the compressor 1 is operated and the cooling device is operated, the liquid refrigerant flow shown by the solid line arrow is generated. Therefore, the valve ball 22 is moved upward to ensure the flow of liquid refrigerant, and when the thermostat 7 is turned off, that is, when the compressor 1 is stopped by the electromagnetic clutch 8, the suction pipe 1
The liquid refrigerant no longer flows in from the lower end opening side of 2'.
The liquid refrigerant on the side of the suction pipe 12' immediately causes the valve ball 22 to sit on the valve seat 20 and close the valve, so that the backflow of the liquid refrigerant in the pipe line 2 connected to the outflow line 13 is immediately prevented. , gas phase generation in the conduit 2 is eliminated, and noise generation on the conduit side is prevented. Also,
In the present invention, the check valves 20, 21, and 22 are incorporated into the suction pipe 12', so the structure is extremely simple and can prevent backflow extremely efficiently, providing excellent noise prevention performance. have

In the above embodiment, a check valve is provided in the lower part of the suction pipe, but its installation position and configuration can be changed to various designs as long as the above objectives are achieved. .

[Brief explanation of drawings]

Figure 1 is a mechanical diagram showing a conventional car air conditioner, Figure 2 is a noise level generation diagram of Figure 1, and Figure 3 is a diagram of the noise level of Figure 1.
FIG. 4 is an enlarged vertical cross-sectional view of the receiver shown in the figure, and FIG. 4 is a vertical cross-sectional view of the receiver showing an embodiment of the present invention. 2: Liquid refrigerant pipe line, 4': Receiver, 12': Suction pipe, 20: Valve seat, 21: Stopper, 22:
Ben ball.

Claims (1)

[Scope of utility model registration request] In a receiver installed in a liquid refrigerant pipe,
A receiver for a cooling device, characterized in that a suction pipe of the receiver is provided with a check valve for preventing backflow.