JPS58214757A - Air conditioner - 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 an air conditioner, and more particularly to a refrigeration cycle that performs effective dehumidification by changing the amount of refrigerant circulating in a refrigerant circuit.

A general air conditioner basically consists of a compressor, a condenser, a pressure reducing device, and an evaporator. During cooling operation, the evaporator is located on the indoor side and simultaneously performs cooling and dehumidification. However, when the indoor air conditioner is uncomfortable due to low temperature and high humidity, running the air conditioner will dehumidify the room, but it will not cool the room at the same time, leading to discomfort due to excessive cooling. Therefore, in such cases, a refrigeration cycle is required to significantly lower the humidity while keeping the room temperature as low as possible.

Conventionally, as an example of a refrigeration cycle capable of dehumidifying operation of this type, as shown in FIG. There is a refrigerant circuit in which the exchanger f is directly connected in order, a first two-way valve q is connected in parallel with the first pressure reducer C, and a second two-way valve is connected in parallel with the second pressure reducer e. Note that i indicates an indoor unit and jld indicates an outdoor unit.

During normal cooling operation, the first two-way valve q is closed, the second two-way valve is opened, and the refrigerant is transferred from the compressor a to the condenser b, the first pressure reducer C1, the first heat exchanger d, and the second two-way valve q. The water flows through the 22-way valve h and the second heat exchanger f in this order, and a freezing cycle is formed in which both the first heat exchanger d and the second heat exchanger f function as an evaporator.

In addition, during dehumidification operation, the first two-way valve q opens, the second two-way valve closes, and the refrigerant is transferred from the compressor a to the condenser b, the first two-way valve q, the first heat exchanger d, A refrigeration cycle is formed in which the air flows in the order of the second pressure reducer f, the first heat exchanger d acts as a sub-condenser, and the second heat exchanger f acts as an evaporator. Then, the indoor air that has been cooled and dehumidified in the second heat exchanger f passes through the first heat exchanger d, where a high-temperature, high-pressure refrigerant flows, and is warmed to the temperature before passing through the second heat exchanger f. .

In such a conventional cycle, an extra pressure reducer and two two-way valves are required for the cooling-only air conditioner, which has a well-known structure, making the structure complex, increasing the number of parts, and increasing manufacturing costs. It had the disadvantage of increasing significantly.

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks of the conventional example, the present invention provides an air conditioner that reduces the number of parts, has a simpler structure, and dehumidifies a room without lowering the temperature.

Hereinafter, the present invention will be explained with reference to FIG. 2 of the accompanying drawings showing one embodiment thereof.

In the figure, the refrigeration cycle includes a compressor 1, a condenser 2, a first pressure reducer 3, a two-way valve 4, a first heat exchanger 6, and a second heat exchanger 6 connected in an annular manner. 6 and a second pressure reducer connected in parallel.

During cooling operation, the two-way valve 4 is opened. As a result, the refrigerant flows from the compressor 1 to the condenser 2, to the first pressure reducer 3, to the two-way valve 4, to the first heat exchanger 6, to the second heat exchanger 6, as shown by the solid arrow, and the first The exchanger 5° and the second heat exchanger 6 together form a refrigeration cycle that functions as an evaporator.

When dehumidifying operation is still in progress, the two-way valve 4 is closed. As a result, the refrigerant flows from the compressor 1 to the condenser 2, the first pressure reducer 3, the second pressure reducer 7, and the second heat exchanger 6 in the order shown by the dashed arrow, and the refrigerant flows to the first heat exchanger 5. A refrigeration cycle is formed in which only the second heat exchanger 6 functions as an evaporator. Therefore, during dehumidification operation, the evaporator capacity is reduced compared to during cooling operation, and the cooling capacity is reduced.

Therefore, the temperature of the blown air is higher than during cooling operation, and when the room is uncomfortable due to low temperature and humidity, dehumidification can be performed without lowering the temperature of the room as much as possible.

As is clear from the above embodiments, the air conditioner of the present invention divides the refrigerant circuit of the heat exchanger on the indoor side of the air conditioner into two or more, and closes or opens at least one of the refrigerant circuits. Therefore, an on-off valve is installed to control the amount of refrigerant flowing through the refrigerant circuit of the indoor heat exchanger, and the opening/closing operation of this on-off valve reduces the portion of the indoor heat exchanger that functions as an evaporator, resulting in dehumidification operation. Compared to a cooling-only air conditioner having a well-known structure, only a two-way valve is provided, and the air conditioner can dehumidify without interfering with the original cooling operation.

[Brief explanation of the drawing]

FIG. 1 is a refrigerant circuit diagram showing a conventional example, and FIG. 2 is a refrigerant circuit diagram of an air conditioner according to an embodiment of the present invention. 4... Two-way valve, 5... First heat exchanger,
6...Second heat exchanger. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] Controls the amount of refrigerant flowing through the refrigerant circuit of the indoor heat exchanger by dividing the refrigerant circuit of the indoor heat exchanger of an air conditioner into two or more parts and closing or opening at least one of the refrigerant circuits. An air conditioner that is equipped with an on-off valve that operates as a dehumidifier by reducing the portion of the heat exchanger on the indoor side that functions as an evaporator by opening and closing the on-off valve.