JPS5930365Y2 - air conditioner - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an air conditioner, and particularly relates to an air conditioner capable of cooling and dehumidifying operation.

A typical refrigeration cycle of this type of air conditioner includes one having a cycle shown in FIG.

In FIG. 1, the dashed arrow indicates the flow direction of the refrigerant during the cooling cycle.
When the second solenoid valve 8 located between the indoor heat exchanger 4 and the second indoor heat exchanger 5 is opened, the refrigerant gas compressed by the refrigerant compressor 1 to a high temperature is cooled by the outdoor heat exchanger 2. is depressurized by the first capillary tube 3 in parallel with the first solenoid valve 1, becomes low temperature, passes through the first indoor heat exchanger 4, and passes through the second solenoid valve 8 (the second solenoid valve 8 and the second The refrigerant hardly passes through the capillary tube 6 due to its large flow resistance), passes through the second indoor heat exchanger 5, and returns to the refrigerant compressor 1; Vessel 4, 2nd
Indoor air passing outside the indoor heat exchanger 5 in the direction of the arrow is cooled to cool the room.

In FIG. 1, the solid arrow indicates the flow direction of the refrigerant during the dehumidification cycle, and in this case, the first solenoid valve 1 is opened,
The second solenoid valve 8 is closed.

The refrigerant gas compressed to a high temperature by the refrigerant compressor 1 is cooled to some extent by the outdoor heat exchanger 2, and passes through the first electromagnetic valve 7 (the first capillary tube 3 has a large flow resistance, so the refrigerant gas The refrigerant hardly passes through this capillary), is further cooled in the first indoor heat exchanger 4 (this increases the temperature of the passing air), is depressurized by the second capillary 6, and the low-temperature refrigerant is The indoor air is cooled and dehumidified by the second indoor heat exchanger 5, and then returned to the refrigerant compressor 1.

The first indoor heat exchanger 4 and the second indoor heat exchanger 5 are arranged adjacent to each other, and the passing indoor air passes through the second indoor heat exchanger 5 and then passes through the first indoor heat exchanger 5. Since the air is configured to pass through the exchanger 4, the air passing through is cooled and dehumidified by the second indoor heat exchanger 5, and then the air passing through the second indoor heat exchanger 5 is cooled and dehumidified.
It will be heated by the indoor heat exchanger 4.

In other words, dehumidification can be performed without substantially lowering the indoor air temperature.

However, when the conventional air conditioner capable of cooling and dehumidifying operation as described above is operated when the indoor air temperature is low, the refrigerant is depressurized in the capillary tube and becomes low temperature in both cooling and dehumidifying operation. This had the disadvantage that the indoor heat exchanger would freeze, making it impossible to operate at low indoor air temperatures.

This idea was made in order to improve the above-mentioned drawbacks. A temperature switch was installed to detect the temperature of the second indoor heat exchanger, and when the second indoor heat exchanger was frozen, the temperature switch was 1st
It is characterized in that both the solenoid valve and the second solenoid valve are connected to open.

Next, this invention will be explained with reference to the illustrated embodiment. In FIG. The temperature switch 9 is installed to detect the temperature at which the second indoor heat exchanger 5 is about to freeze using the detection section 10'1.
Then, the first solenoid valve 7 and the second solenoid valve 8 are opened both during the cooling operation and the dehumidification operation.

An example of the circuit wiring for this operation is shown in FIG. 3. The changeover switch 11 is a switch for switching between cooling and dehumidification operation, and the first solenoid valve 1 and the second solenoid valve 8 are selectively operated.

12 is a contact point of the temperature switch 9. When the temperature switch 9 operates, the contact 12 closes, and both the first solenoid valve and the second solenoid valve are open (however, the solenoid valve is closed during the energization time). ).

Furthermore, when the deicing of the second indoor heat exchanger 5 is completed, the contact 12 of the temperature switch 9 is set to open. Since the temperature is also low, it is suitable for detecting freezing conditions.

When the air conditioner capable of cooling and dehumidifying operation of this invention is operated when the indoor air temperature is low, when the heat exchanger begins to freeze during both cooling and dehumidifying operation, the first solenoid valve 1 and the second solenoid valve are activated. 8 is in the closed state, the high temperature refrigerant coming out of the refrigerant compressor 1 does not pass through the capillary tube and circulates without being depressurized by the capillary tube, so it does not become a low temperature refrigerant, so the heat exchanger can be quickly de-icing. Once deicing is completed, it is possible to resume the original operation and continue operation.

Therefore, this invention eliminates the drawback that the indoor heat exchanger freezes and becomes inoperable at low indoor temperatures.

[Brief explanation of the drawing]

Figure 1 is a refrigeration circuit piping diagram of a conventional air conditioner capable of cooling and dehumidifying operation, Figure 2 is a refrigeration circuit piping diagram of an air conditioner capable of cooling and dehumidifying operation with the control circuit of this invention, and Figure 3 is a temperature switching diagram. FIG. 2 is an electrical circuit diagram for operating a solenoid valve using a device. DESCRIPTION OF SYMBOLS 1... Refrigerant compressor, 2... Outdoor heat exchanger, 3... Capillary tube, 4... First indoor heat exchanger, 5... ...Second indoor heat exchanger, 6.
...Capillary tube, 7...First solenoid valve, 8...
...Second solenoid valve, 9...Temperature switch, 10
...Detection section, 11...Switch, 12
・・・・・・Contact point of temperature switch 9.

Claims (1)

[Scope of utility model registration request] an outdoor heat exchanger connected to the discharge side of the refrigerant compressor; a first electromagnetic valve connected in parallel with the capillary between the outdoor heat exchanger and the first indoor heat exchanger; The outlet connected to the indoor heat exchanger is provided with a capillary tube between the suction port of the compressor and the second indoor heat exchanger, and a second electromagnetic valve arranged in parallel, so that cooling operation and dehumidification operation can be performed. In a possible air conditioner, a temperature switch detects the temperature of the second indoor heat exchanger, and when the second indoor heat exchanger freezes, both the first solenoid valve and the second solenoid valve An air conditioner comprising: a circuit of the temperature switch connected so that both circuits are open.