JPS6054580B2 - Refrigeration cycle for air conditioners - Google Patents

Description

[Detailed Description of the Invention] The present invention prevents heat exchange between high-pressure side refrigerant and low-pressure side refrigerant during heating operation, which reduces the heating capacity, in an air conditioner that can perform heating operation in addition to cooling. This is related to the refrigeration cycle.

When a conventional air conditioner is shown in Figure 1, 1 is a compressor, 2
3 is a four-way valve for refrigerant switching, 3 is a slide valve, 4 is a condenser on the outdoor side, 5 is a pressure reducer, and 6 is an evaporator on the indoor side. During cooling operation, the refrigerant flows as shown by the solid line, and the high-pressure high-temperature gas refrigerant discharged from the compressor 1 is liquefied, and the pressure is reduced by the pressure reducer 5 to become low-pressure low-temperature refrigerant, which is then transferred to the indoor heat exchanger (evaporator 6). It absorbs heat and becomes a low-pressure, low-temperature gas refrigerant and returns to the compressor 1. During heating operation, the refrigerant is supplied through the slide valve 3 in the 4-way refrigerant switching valve 2.
Due to this action, the air flows as shown by the dotted line, and the heat exchanger on the indoor side works as a condenser, heating the indoor side. In such a refrigeration cycle, there was a cause that reduced the heating capacity. The high-pressure high-temperature gas refrigerant and low-pressure low-temperature gas refrigerant discharged from the compressor 1 exchange heat in the four-way valve 2, and the refrigerant with reduced enthalpy is transferred to the indoor heat exchanger (
This means that the heating capacity is reduced because it flows into the evaporator 6). The present invention eliminates heat exchange between the high-pressure high-temperature refrigerant and the low-pressure low-temperature refrigerant within the four-way valve 2 during heating operation. An embodiment of the present invention is shown in FIG. 2, 7 is a valve body, 8 is a piston, 9 is a spring, 10 is a first conduit, 4
The high-temperature gas refrigerant discharged from the compressor flows during cooling.

A second conduit 11 is connected to a heat exchanger on the outdoor side.

12 is a third conduit through which refrigerant returns to the compressor.

13 is a switching valve which connects the first to third conduits 10, 11, 12;
is connected, and a piston 8 is built in that is pressed toward the first conduit 10 by a spring 9. When high-pressure refrigerant flows into the first conduit 10, the piston 8 resists the force of the spring 9 and moves toward the third conduit 12. There are things that are under pressure.

During cooling operation, the refrigerant flows as shown by the solid line, and the refrigerant discharged from the compressor 1 passes through the four-way valve 2 and then passes through the first conduit 10 to the switching valve 1.
3 and flows out through the second conduit 12. Initially, the refrigerant flows out from the third conduit 12, but due to the pressure difference of the refrigerant flowing through the clearance between the valve body 7 and the piston 8, the force pushing the piston 8 becomes greater than the spring force, and the piston 8
will block the third conduit 12. The refrigerant that exits the second conduit 11 is liquefied in the outdoor heat exchanger (condenser 4), reduced in pressure by the pressure reducer 5 to become a low-pressure low-temperature refrigerant, and absorbed heat in the indoor heat exchanger (evaporator 6). , passes through the four-way valve 2 and returns to the compressor 1. During heating operation, the refrigerant flows as shown by the dotted line, and the refrigerant discharged from the compressor 1 passes through the four-way valve 2 and is transferred to the indoor heat exchanger (
The evaporator 6) acts as a condenser and heats the interior of the room.
The refrigerant that has passed through the pressure reducer 4 is transferred to the outdoor heat exchanger (condenser 4)
and flows into the switching valve 13 from the second conduit. The refrigerant flowing out from the fourth conduit returns to the compressor 1. As described above, the present invention increases heating capacity by preventing heat exchange between high-pressure, high-temperature refrigerant and low-pressure, low-temperature refrigerant during heating operation.

[Brief explanation of the drawing]

FIG. 1 shows a conventional refrigeration cycle for an air conditioner, and FIG. 2 shows a refrigeration cycle according to the present invention. 1...Compressor, 2...4-way valve, 3...
...Slide valve, 4...Outdoor condenser,
5... Pressure reducer, 6... Indoor evaporator, 7... Valve body, 8... Piston, 9...
...Spring, 10...First conduit, 11...
...Second conduit, 12...Third conduit, 13.
...Switching valve.

Claims (1)

[Claims] 1 In a refrigeration cycle for an air conditioner in which the flow of refrigerant is switched between cooling operation and heating operation by switching the flow of refrigerant with a four-way valve, the switching valve and the four-way valve are connected to discharge the refrigerant from the compressor during cooling. A first conduit through which the high-temperature gas refrigerant flows, a second conduit that connects the switching valve and the outdoor heat exchanger, and a second conduit that connects the switching valve and the compressor to return low-temperature gas to the compressor during heating. It includes a third conduit through which a refrigerant flows, a piston built into the switching valve, and a spring that presses the piston toward the first conduit, and the piston is activated by the pressure of the high-temperature gas refrigerant flowing into the first conduit during cooling. A refrigeration cycle for an air conditioner, characterized in that a third conduit is closed by being pressed against the force of a spring.