JPH08254372A - Air conditioner - Google Patents

Abstract

(57) [Summary] [Construction] An electronic expansion valve is provided between the indoor heat exchanger and the opening of the electronic expansion valve is changed to adjust the reheat amount and cooling amount of the heat exchanger. [Effect] During dehumidification operation, the opening of the electronic expansion valve provided between the two halves of the indoor heat exchanger can be changed to adjust the evaporation temperature of the cooler so that it does not drop too much, and frost can be formed on the cooler. The dehumidifying performance can be exhibited without any operation, and the dehumidifying operation that prevents a decrease in room temperature can be performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner having a dehumidifying function.

[0002]

2. Description of the Related Art A conventional technique will be described below with reference to FIG. FIG. 1 shows a refrigerating cycle, and the arrows in the figure show the circulation direction of the refrigerant. When performing the dehumidifying operation while preventing the room temperature from decreasing, the bypass solenoid valve 5 is opened to pass the refrigerant from the compressor 1 to the outdoor heat exchanger 3 to bypass the cooling / heating decompression device 4. Then, the bypass solenoid valve 8 is closed to reduce the pressure by the dehumidifying decompression device 7 to form a cycle. Therefore, the indoor heat exchanger 9 is operated as a reheater, and the indoor heat exchanger 10 is operated as a cooler.

Japanese Patent Laid-Open No. 2-2031 discloses such a technique.
There is No. 72 publication.

[0004]

By the way, in the above-mentioned conventional structure, the following inconveniences have occurred. A room air conditioner having a dedicated dehumidifying function by improving the refrigerant circuit of a conventional room air conditioner is intended for dehumidification only during the rainy season. For this reason, the dehumidifying function could not be sufficiently exerted during the snowy and humid season of winter.

When used in the humid season of winter, the outside temperature in winter is much lower than room temperature, so that the temperature of condensation in the outdoor heat exchanger is very low, and the decompression device 7 for dehumidification has a constant throttle amount. Therefore, the evaporation pressure of the indoor heat exchanger 10 becomes extremely low, and when the operation is started, frost adheres to the indoor heat exchanger 10, and this becomes an ice layer after a short time, so that the dehumidifying function cannot be sufficiently exerted. It was something that ended up.

An object of the present invention is to enable dehumidification to be performed even in winter without lowering the room temperature.

[0007]

In order to solve the above-mentioned problems, the present invention uses an electronic expansion valve as a dehumidifying decompression device provided between the indoor heat exchangers that have been conventionally used for two minutes. Adjust the reheat amount and cooling amount of the heat exchanger by changing the opening of the expansion valve.

[0008]

With this configuration, when the dehumidifying operation is performed to prevent the room temperature from decreasing, the opening degree of the electronic expansion valve provided while the indoor heat exchanger is divided into two parts is changed to lower the evaporation temperature of the cooling heat device too much. It is possible to perform dehumidification operation that is adjusted so that the room temperature does not drop.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. 2, the compressor 1, the four-way valve 2,
The outdoor heat exchanger 3, the heating / cooling decompression device 4, the indoor heat exchanger 9, the indoor heat exchanger 10, the indoor heat exchangers 9 and 10 are connected by the electronic expansion valve 12, and these are sequentially connected to form a refrigeration cycle. ing.

The arrows in the figure represent the direction of refrigerant circulation. During the normal cooling operation and the heating operation, the bypass solenoid valve 5 is closed and the electronic expansion valve 12 is fully opened in order to pass through the cooling / heating decompression device 4.

When performing dehumidifying operation without lowering the room temperature,
First, in the cycle, the refrigerant flows from the compressor 1 to the outdoor heat exchanger 3
Through the indoor heat exchangers 9 and 10. At this time, the bypass solenoid valve 5 is opened in order to bypass the cooling / heating decompression device 4, and the bypass solenoid valve 5 is allowed to flow into the room at high temperature and high pressure.
Alternatively, an electronic expansion valve may be used instead of the air conditioning decompression device 4 and the bypass solenoid valve 5 to be fully opened. Then, the opening degree of the electronic expansion valve 12 is changed depending on the temperature condition.
It is also possible to change the opening depending on the humidity condition.

In order to change the opening according to the temperature condition, for example, the temperature of the indoor heat exchanger 10 (cooler) is detected by a temperature sensor, and when the evaporation temperature becomes low, a pulse signal is used to output an electronic expansion valve. The opening of 12 is opened to the required throttle amount, the evaporation pressure is increased, and control is performed so as not to overcool. As another example, the outside air temperature or the outdoor heat exchanger 3
Temperature is detected by the temperature sensor, and when the outside air temperature or the temperature of the outdoor heat exchanger 3 becomes low, the electronic expansion valve 1
Open the opening of 2 to the required throttle amount, raise the evaporation pressure,
Control not to overcool. As still another example, when the reheat temperature of the indoor heat exchanger 5 is lowered and the room temperature is likely to drop, the temperature of the indoor heat exchanger 5 is sensed by a temperature sensor,
Control is performed to close the opening degree of the electronic expansion valve 12 to a throttle amount that secures the required amount of heat.

As still another example, a humidity sensor or a means for sensing the humidity is used to change the opening of the electronic expansion valve 12 to adjust the reheat amount and the cooling amount, and the dehumidifying amount is arbitrarily set. Control is possible.

As a result, it is possible to perform dehumidification while preventing the room temperature from decreasing. Further, even in the low temperature and high humidity season of winter, the opening degree of the electronic expansion valve 12 is changed to adjust the reheat amount and the cooling amount, the refrigerant temperature evaporated in the indoor heat exchanger 10 becomes high, and the indoor heat exchange is immediately performed after the operation. The dehumidifying function can be exhibited without frosting on the container 10.

[0015]

INDUSTRIAL APPLICABILITY According to the present invention, when the dehumidifying operation is performed, the indoor heat exchanger is
By changing the opening of the electronic expansion valve provided during the division, the evaporation temperature of the cooler is adjusted so as not to drop too much, and therefore, the dehumidification performance can be exhibited without frosting on the cooler, A dehumidifying operation that prevents the room temperature from decreasing can be performed.

[Brief description of drawings]

FIG. 1 is a refrigeration cycle diagram of an air conditioner showing a conventional example.

FIG. 2 is a refrigeration cycle diagram of an air conditioner showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Compressor, 2 ... Four-way valve, 3 ... Outdoor heat exchanger, 4 ... Air conditioning decompression device, 5 ... Bypass solenoid valve, 6 ... Outdoor fan, 7 ... Dehumidification decompression device, 8 ... Bypass solenoid valve, 9 ... Indoor heat exchanger, 10 ... Indoor heat exchanger, 11 ... Indoor fan, 12 ... Electronic motor operated valve.

Claims (1)

[Claims] 1. A refrigeration cycle comprising a compressor, an outdoor heat exchanger, a cooling / heating switching valve, a throttle device, and an indoor heat exchanger,
In an air conditioner that divides the indoor heat exchanger into two parts and provides an electronic expansion valve between them, during dehumidification operation, the opening degree of the electronic expansion valve is changed and the reheat amount and cooling of the divided heat exchanger are performed. An air conditioner characterized by adjusting the amount.