JPS5912260A - Controller for capacity of 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 a capacity control device for an air conditioner.
More specifically, the present invention provides a cooling cycle whose capacity can be controlled in four stages during dehumidification operation.

A cooling cycle capable of general dehumidification operation is configured such that switching between cooling-only dehumidification and heating-only dehumidification can be performed by turning on or stopping the outdoor fan during dehumidification operation. However, such a structure has some problems in that the indoor temperature changes greatly due to the switching operation, and the comfort of the indoor air conditioning is reduced.

Therefore, it is necessary to change the cooling capacity during dehumidification operation.

An example of a cooling cycle capable of conventional dehumidifying operation and l~,
As shown in FIG. Condenser 2゜First pressure reducer 3. Sub-condenser6. The second two-way argument was completed.

Connect the evaporators 8 in sequence I ~, further connect the first 20,000 valve 4 in parallel with the first pressure reducer 3, and connect the second pressure reducer 6 in parallel with the second two-way valve 7. A structure is known in which the refrigerant circuit is configured as shown in FIG. During dehumidification operation, the first two-way valve 4 opens, and the second two-way valve 7 opens.
is closed and the refrigerant flows from compressor 1 to condenser 2. First two-way valve4. Sub-condenser 5. Second pressure reducer6. It flows in order of evaporator 8.

The indoor air that has been heat exchanged and cooled and dehumidified in the evaporator 8 is then heat exchanged in the sub-condenser 5 through which refrigerant is flowing at high temperature and high pressure by the indoor blower 9. It is reheated to a slightly higher temperature than before passing through the vessel 8.

This cycle is generally referred to as a heating-only dehumidifying operation when the outdoor fan 10 is stopped.

Further, when the outdoor blower 1o is operated, the high-temperature, high-pressure refrigerant gas discharged from the compressor 1 becomes a low-temperature, high-pressure refrigerant, and a so-called cooling-only dehumidifying operation is performed.

In such a conventional cycle, the indoor air conditioning temperature changes greatly between the heating-only dehumidifying operation and the cooling-only dehumidifying operation. Therefore, the outdoor air blower 1
The temperature is controlled by intermittent operation at 0, but improvements were needed in terms of comfort.

In view of the above conventional drawbacks, the present invention aims to improve comfort in indoor space by reducing changes in indoor air conditioning temperature even during dehumidification operation.

Hereinafter, one embodiment of the present invention will be described with reference to FIG. 2 of the accompanying drawings. Here, the same numbers as those in FIG. 1 are given the same numbers, and the description thereof will be omitted.

The difference between this figure and FIG. 1 is that the basic refrigeration cycle is the same, but a bypass circuit connecting the sub-condenser 5 and the second 20,000 valve 7 to the suction side of the compressor 1 is installed. This bypass circuit is provided with a third two-way valve.

In the above configuration, in the heating-only dehumidifying operation, the outdoor fan 10 is stopped, the first two-way valve 4 is opened, and the second two-way valve 7 is opened.
is closed, and the indoor fan 9 and compressor 1 operate normally. As a result, the heat dissipation capacity of the condenser 2 is reduced, and the high-temperature, high-pressure refrigerant is heat-exchanged in the sub-condenser 6. Thereafter, it flows through the second pressure reducer 6.

The indoor air that has been cooled and dehumidified by heat exchange in the evaporator 8 is then heat exchanged in the sub-condenser 6 and becomes slightly higher in temperature than before passing through the evaporator 8.

By opening the third two-way valve 11, the sub-condenser 6
The amount of refrigerant flowing from the evaporator to the evaporator 8 decreases, and the heat absorption capacity of the evaporator 8 decreases. Therefore, the air temperature is lowered by the third two-way valve 11.
The temperature of the air sent indoors will be slightly higher than when the door is closed and the heating-only dehumidifying operation is performed. Also, when the cooling and dehumidifying operation starts, the outdoor fan 1o is stopped, the first 20,000 valve 4 is opened, the second 2-way valve 7 is closed, and the indoor fan 9 and 6 and the compressor 1 are turned on. Perform normal operation. As a result, the low temperature and high pressure refrigerant that has undergone heat exchange in the condenser 2 flows through the sub-condenser 6, flows through the second pressure reducer 6, and is heat exchanged in the evaporator 8. The indoor air, which has been cooled and dehumidified by heat exchange in the evaporator 8, undergoes heat exchange in the sub-condenser 6, and the temperature is slightly lower than before passing through the evaporator 8. By opening the third two-way valve 11, the amount of refrigerant flowing to the evaporator 8 is reduced.

The heat absorption capacity of the evaporator 8 is reduced. Therefore, the temperature of the air sent to the indoor side is a little higher than when the third 20,000 valve 11 is closed and cooling-only dehumidification operation is performed.

As is clear from the above embodiments, the present invention connects a compressor, a condenser, a first pressure reducer, a sub-condenser, a second two-way valve, and an evaporator in a ring to form a refrigeration cycle, Furthermore, the first
A first two-way valve 4 is connected in parallel with the pressure reducer, a second pressure reducer is connected in parallel with the second two-way valve, and a refrigerant inflow side of the second two-way valve is connected. Between the suction side of the compressor, the third
A bypass circuit equipped with a 2-way Page valve is provided. During cooling operation, the first 2-way valve closes, the second 2-way valve opens, and the compressor,
By opening and closing the third two-way valve while the outdoor blower and indoor blower are operating normally, two-step capacity control can be performed during cooling, and during dehumidification operation, the first two-way valve is opened. ,
The second 2-way valve is closed to allow only the compressor and indoor blower to operate normally, and the outdoor blower and third 2-way valve are combined to perform dehumidification operation, allowing for 4-stage capacity control. This four-stage control has the advantage of allowing comfortable indoor air conditioning by making the change in indoor air conditioning temperature gentle under any indoor air conditioning conditions.

[Brief explanation of the drawing]

FIG. 1 is a refrigerant circuit diagram showing a conventional example, and FIG. 2 is a refrigerant circuit diagram in an embodiment of the present invention. 1... Compressor, 2... Condenser, 3...
...First pressure reducer, 4...First two-way valve,
6...Sub-condenser, 6...Second two-way valve, 7...Second pressure reducer, 8...Evaporator-11. ...Third two-way valve, A...Bypass" page circuit. Name of agent: Patent attorney Toshi Nakao, male, 1st person
Figure 2-26:

Claims (1)

[Claims] A compressor, a condenser, a first pressure reducer, a sub-condenser, a second two-way valve, and an evaporator are connected in an annular manner to form a refrigeration cycle, and a first pressure reducer is connected in parallel with the first pressure reducer. Connect the two-way valve,
Further, a second pressure reducer is connected in parallel with the second two-way valve,
The capacity control device for an air conditioner further includes a binox circuit including a third two-way valve between the refrigerant inflow side of the second two-way valve and the suction side of the compressor.