JPH07167537A - Heat pump type air conditioner - Google Patents

Abstract

PURPOSE:To prevent deterioration of an air conditioning feeling by increasing an interval of defrosting operation by delaying frosting of an outdoor heat exchanger. CONSTITUTION:A throttle mechanism 9 for heating and a check valve 10 for feeding refrigerant at the time of defrosting are connected in parallel between split heat exchangers 3A and 3B split from an outdoor heat exchanger. A check valve 8 for feeding the refrigerant only at the time of heating is connected in parallel with the mechanism 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump type air conditioner.

[0002]

2. Description of the Related Art A refrigerant circuit of a conventional heat pump type air conditioner is shown in FIG. In FIG. 3, O is an outdoor unit, which includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, an outdoor fan 4, a throttle mechanism 5, and the like. An indoor unit I is equipped with an indoor heat exchanger 6 and an indoor fan 7.

During the heating operation of this heat pump type air conditioner, the gas refrigerant discharged from the compressor 1 enters the indoor heat exchanger 6 through the four-way valve 2 as shown by the solid line arrow, where the indoor fan 7 is placed. By condensing and liquefying by heating the indoor air sent by. This liquid refrigerant is the outdoor unit O
Then, after being adiabatically expanded by being throttled by the throttling mechanism 5, it enters the outdoor heat exchanger 3, where it absorbs heat from the outside air sent by the outdoor fan 4 and evaporates. This gas refrigerant is sucked into the compressor 1 via the four-way valve 2.

When frost of a predetermined value or more adheres to the surface of the outdoor heat exchanger 3 during this heating operation, the defrosting operation is performed by switching the four-way valve 2 in the opposite direction and stopping the indoor fan 7 at the same time. . During the defrosting operation, the refrigerant discharged from the compressor 1 passes through the four-way valve 2, the outdoor heat exchanger 3, the throttling mechanism 5, the indoor heat exchanger 6, and the four-way valve 2 in this order as indicated by the broken line arrow. After that, it returns to the compressor 1. During the cooling operation, the refrigerant circulates as in the defrosting operation.

[0005]

In the above-described conventional air conditioner, the room cannot be heated during the defrosting operation. Therefore, if the interval of the defrosting operation is short, the air conditioning feeling of the room is significantly impaired. There was a problem.

[0006]

The present invention has been invented to solve the above-mentioned problems, and the gist of the invention is to provide a compressor, a four-way valve, an indoor heat exchanger, a throttle mechanism and an outdoor heat source. In a heat pump type air conditioner equipped with an exchanger and switching the four-way valve in the defrosting operation in reverse to that in the heating operation, for heating between a pair of split heat exchangers obtained by dividing the outdoor heat exchanger into two. A heat pump type air conditioner characterized in that a throttle valve and a check valve for flowing refrigerant during defrosting operation are connected in parallel and a check valve for flowing refrigerant only during heating operation is connected in parallel with the throttle mechanism. is there.

The split heat exchanger functioning as a condenser during heating can be arranged below the other split heat exchanger.

The split heat exchanger functioning as a condenser during heating can be arranged on the windward side of the blowing path of the other split heat exchanger.

[0009]

In the present invention, during the heating operation, the gas refrigerant discharged from the compressor is passed through the four-way valve, the indoor heat exchanger, the check valve, and then one of the split heat exchangers, the heating throttle mechanism, and the other split heat. It circulates to a compressor through an exchanger and a four-way valve in this order.

During the defrosting operation, the gas refrigerant discharged from the compressor is supplied to the four-way valve, the other split heat exchanger, the check valve, the one split heat exchanger, the throttle mechanism, the indoor heat exchanger and the four-way valve. After that, it circulates to the compressor.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A first embodiment of the invention is shown in FIG. The outdoor heat exchanger 3 is divided into two, and the divided heat exchangers 3A and 3B
The heating throttle mechanism 9 and the check valve 10 for flowing the refrigerant during the defrosting operation are connected in parallel between the pair of split heat exchangers 3A and 3B. The split heat exchanger 3A has a capacity capable of exhibiting a sufficient evaporator function by itself.

A check valve 8 is connected in parallel with the throttle mechanism 5 so that the refrigerant flows only during the heating operation. Other configurations are shown in FIG.
It is similar to the conventional one shown in FIG. 3, and corresponding members are designated by the same reference numerals.

During the heating operation, however, the gas refrigerant discharged from the compressor 1 enters the indoor heat exchanger 6 via the four-way valve 2 as shown by the solid line arrow, and is sent by the indoor fan 7 here. Partially condensed and liquefied by radiating heat to the air. Then, through the check valve 8, the split heat exchanger 3B
Then, by radiating heat to the outside air sent by the outdoor fan 4, the rest is condensed and liquefied.

The liquid refrigerant is adiabatically expanded by being throttled by the heating throttling mechanism 9, and then enters the split heat exchanger 3A,
Here, the heat is absorbed from the outside air sent to the outdoor fan 4 to be evaporated and vaporized. This gas refrigerant returns to the compressor 1 via the four-way valve 2. At this time, the split heat exchanger 3B functions as a condenser together with the indoor heat exchanger 6.

During the defrosting operation, the gas refrigerant discharged from the compressor 1 is divided into the heat exchanger 3A, the check valve 10, the heat exchanger 3B, the throttle mechanism 5, and the indoor heat exchanger as indicated by the broken line arrow. Vessel 6,
Return to the compressor 1 via the four-way valve 2. At this time, the split heat exchanger
Both 3A and 3B function as a condenser. In the cooling operation, the refrigerant circulates as indicated by the broken line arrow as in the defrosting operation.

However, during the heating operation, both the indoor heat exchanger 6 and the split heat exchanger 3B function as a condenser, and a high-temperature refrigerant flows into the split heat exchanger 3B, so that frost adheres to this surface. This can be prevented or suppressed, and as a result, the interval of the defrosting operation can be extended compared to the conventional one, so that the deterioration of the air conditioning feeling can be prevented.

Since the frost formation proceeds from the lower part of the outdoor heat exchanger, if the divided heat exchanger 3B functioning as a condenser during the heating operation is arranged below the other divided heat exchanger 3A, the frost formation will occur. Can be effectively delayed.

Further, since frost formation proceeds from the outside air inlet side of the outdoor heat exchanger, as shown in FIG. 2, the divided heat exchanger 3B is located on the windward side of the outside air blowing path with respect to the divided heat exchanger 3A. If arranged, frost formation can be effectively delayed.

[0019]

According to the present invention, one of the split heat exchangers functions as a condenser during the heating operation, and the high-temperature refrigerant flows into the condenser, so that the frost formation on the outdoor heat exchanger can be delayed. Therefore, the interval of the defrosting operation can be made longer than that of the conventional one, so that the deterioration of the air conditioning feeling can be prevented.

Further, if the split heat exchanger functioning as a condenser during heating operation is arranged below the other split heat exchanger or on the windward side of the air flow path, frost formation on the outdoor heat exchanger will be more effective. Can be delayed.

[Brief description of drawings]

FIG. 1 is a refrigerant circuit diagram of an air conditioner according to a first embodiment of the present invention.

FIG. 2 is a partial refrigerant circuit diagram of an air conditioner according to a second embodiment of the present invention.

FIG. 3 is a refrigerant circuit diagram of a conventional air conditioner.

[Explanation of symbols]

 1 Compressor 2 Four-way valve 6 Indoor heat exchanger 5 Throttle mechanism 3 Outdoor heat exchanger 3A, 3B Split heat exchanger 9 Heating throttling mechanism 8, 10 Check valve

Claims (3)

[Claims] 1. A heat pump type air conditioner comprising a compressor, a four-way valve, an indoor heat exchanger, a throttling mechanism and an outdoor heat exchanger, wherein the four-way valve is switched in reverse to that in heating operation during defrosting operation. A heating throttle mechanism and a check valve for flowing a refrigerant during a defrosting operation are connected in parallel between a pair of split heat exchangers obtained by dividing an outdoor heat exchanger, and a heating operation is performed in parallel with the throttle mechanism. A heat pump type air conditioner, which is connected with a check valve for flowing only a refrigerant. 2. The heat pump type air conditioner according to claim 1, wherein the split heat exchanger functioning as a condenser during heating operation is arranged below the other split heat exchanger. 3. The heat pump type air conditioner according to claim 1, wherein the split heat exchanger functioning as a condenser during heating operation is disposed on the windward side of the air blowing path of the other split heat exchanger.