JP2525338B2 - Defrost mechanism of heat pump type air conditioner - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defrosting mechanism of a heat pump type air conditioner, and more particularly, to prevent cold air from being blown to the inside of the room in the defrosting operation of the heat pump type air conditioner during heating operation. The present invention relates to a defrost mechanism of a heat pump type air conditioner.

[0002]

2. Description of the Related Art In a conventional heat pump type air conditioner, for example, as shown in FIG. 3, a refrigerant cycle is switched to a cooling cycle by a four-way valve 22 during defrosting operation during heating operation. And the compressor 21
The discharged high-temperature and high-pressure refrigerant gas passes through the four-way valve 22 and enters the outdoor unit coil (heat exchanger) 23.
The refrigerant gas is condensed and liquefied by melting the frost attached to the. The condensed and liquefied refrigerant gas passes through the check valve 25 side in parallel with the expansion valve 24 installed on the outlet side of the outdoor unit, and the expansion valve 27 parallel with the check valve 26 installed on the inlet side of the indoor unit. After passing through the side, the indoor unit coil (heat exchanger) 28 evaporates and becomes a refrigerant gas. The low-temperature low-pressure refrigerant gas is sent to the compressor 21 via the accumulator 29. After that,
The same operation is continuously repeated.

At this time, the indoor unit coil 28 takes heat from the air on the indoor side to cool the room. Therefore, during the defrosting operation during the heating operation, the blower 30 of the indoor unit is stopped, or the amount of air blown is reduced to reduce the temperature drop on the indoor side.

As described above, the inside of the room is cooled during the defrost operation, or the blower is stopped or operated with a small amount of air flow, so that the air flow distribution in the room is stagnated and deteriorates, and at the same time, the intake and exhaust amounts such as intake of outside air are reduced. And there was poor ventilation.

[0005]

SUMMARY OF THE INVENTION According to the present invention, when the heat pump type air conditioner is operated for heating, the room temperature is lowered by blowing cold air to the inside of the room during defrosting operation and the cold air is directly received by the body. The coldness and discomfort felt by humans, the poor ventilation caused by the stop of the indoor blower, and the generation of noise due to the start and stop of the blower are eliminated all at once. It is intended to obtain a defrosting mechanism of a heat pump type air conditioner that can continue to operate.

[0006]

The present invention has been made in view of the above points of view, and in a heating circuit of a heat pump type air conditioner, a compressor side, a high pressure adjusting valve and a capillary are provided. The hot gas bypass and one three-way valve that communicates with the check valve and the hot gas bypass valve that branch to the outlet side of the outdoor unit coil with a blower connected in parallel and that shuts off to the four-way valve side A valve and an accumulator branching and communicating with the expansion device side and the parallel check valve on the inlet side of the outdoor unit coil and the expansion valve side, communicating from the indoor unit coil equipped with a blower to the outlet side The valve and the other three-way valve that shuts off to the expansion valve side, and the one-way three-way valve side and the outdoor unit coil side are communicated, and the four-way valve that communicates the accumulator side and the indoor unit coil side, Provide the above The gas bypass valve prevents the pressure on the outlet side from becoming low, and the refrigerant flow rate is adjusted so that the refrigerant returning to the accumulator and the refrigerant sucked into the compressor become gaseous. It is intended to provide a mechanism.

[0007]

Operation and Embodiments One embodiment of the present invention will now be described together with operation with reference to the drawings. FIG. 1 is a configuration diagram illustrating an operation during a heating cycle operation in a basic configuration circuit of a heat pump type air conditioner according to an embodiment of the present invention. First, the two three-way valves A and B and the four-way valve C are switched as shown. That is, the three-way valve A connects the compressor 1 and the four-way valve C, and the three-way valve B connects the check valve 5 on the outlet side of the indoor unit coil (heat exchanger) 2 and the outdoor unit coil (heat exchanger) 8. The expansion valve 7 on the inlet side is communicated with the four-way valve C so that the three-way valve A is communicated with the indoor unit coil 2, and at the same time, the outdoor unit coil 8 is communicated with the accumulator 10.

Then, when the compressor 1 is operated, the refrigerant gas flows in the direction indicated by the arrow. That is, the high-temperature high-pressure refrigerant gas in the compressor 1 is sent from the three-way valve A to the four-way valve C to the indoor unit coil 2, and the indoor unit coil 2 is heated and heated by the operation of the indoor unit side blower 3. The wind is blown indoors. As a result, the room is heated, the indoor unit coil 2 is air-cooled, and the refrigerant gas is liquefied. The liquefied refrigerant gas is used as a check valve 5 in parallel with the expansion valve 4 installed on the outlet side of the indoor unit.
Through the three-way valve B to the expansion valve 7 in parallel with the check valve 6 installed on the inlet side of the outdoor unit. The expansion valve 7
Thus, the liquefied refrigerant gas is decompressed and becomes a low temperature and low pressure gas phase in the outdoor unit coil 8. As a result, the outdoor unit coil 8 is cooled and is heated by the operation of the outdoor unit blower (fan) 9. Then, the low-temperature low-pressure refrigerant gas is sent to the compressor 1 via the four-way valve C and the accumulator 10. After that, the same operation is continuously repeated to perform the heating cycle operation.

FIG. 2 is a configuration diagram for explaining the operation during the defrost cycle operation in the basic configuration circuit of the heat pump type air conditioner of one embodiment of the present invention. First, the two three-way valves A and B and the four-way valve C are switched as shown. That is, the three-way valve A communicates with the compressor 1, and the high pressure control valve 11 and the capillary 12 are connected in parallel, and the three-way valve B communicates with the expansion device 15 and the check valve 6 on the inlet side of the outdoor unit coil 8. Then
The four-way valve C communicates with the three-way valve A and the outdoor unit coil 8, and
The indoor unit coil 2 and the accumulator 10 are set to communicate with each other.

Then, when the compressor 1 is operated, the refrigerant gas flows in the direction indicated by the arrow. That is, the high-temperature and high-pressure refrigerant gas discharged from the compressor 1 passes through the three-way valve A and enters the high-pressure pressure adjusting valve 11 and the capillary 12 connected in parallel, where it is throttled so that the discharge pressure is maintained. . A capillary 12 is connected in parallel to the high pressure adjusting valve 11 so that the refrigerant circuit is not closed even if the high pressure adjusting valve 11 is fully closed. The refrigerant gas that has passed through the high pressure control valve 11 is divided into two. One of them flows to the hot gas bypass valve 13. The other is further branched after passing through the check valve 14, but the refrigerant entering the four-way valve C and communicating with the three-way valve A is blocked by the three-way valve A and does not flow. The other flows to the outdoor unit coil 8, where the frost adhering to the coil 8 is melted. Thereby, the refrigerant gas is deprived of heat and liquefied, and the liquefied refrigerant gas passes through the check valve 6, the three-way valve B, and the expansion device 15 because the expansion valve 7 is normally closed. It is decompressed with. Therefore, the hot gas bypass valve 13 is mixed with the refrigerant gas that has passed therethrough and enters the accumulator 10, while the other one communicates from the four-way valve C to the indoor unit coil 2, the check valve 5, and the expansion valve 4. But the three-way valve B beyond that
Since the refrigerant is hardly flown since it is closed by, the heat exchange in the indoor unit coil 2 is scarce and the cold air does not come out from the indoor unit side. Rather, since some refrigerant condenses in the indoor unit coil 2, slightly warm air may be blown out from the indoor unit side. The hot gas bypass valve 13 prevents the pressure on the outlet side thereof from becoming low, and the accumulator 1
The refrigerant flow rate is adjusted so that the refrigerant returning to 0 and the refrigerant sucked into the compressor 1 become gaseous. With respect to the refrigerant that has entered the accumulator 10, the liquid portion of the refrigerant is separated there, and only the gas portion is sucked into the compressor 1.

Thus, during the defrost operation,
Since the refrigerant does not flow to the indoor unit coil (heat exchanger) 2, the defrost operation can be performed from the indoor unit even if the indoor unit blower 3 is operating without the cold air flowing out.

Instead of the high pressure control valve 11, a device may be used in which the flow rate or pressure of the refrigerant can be adjusted by using a plurality of capillaries or a plurality of solenoid valves.
Further, the blower may be stopped during the defrost operation.

[0013]

As is apparent from the above description, according to the present invention, even if the operation of the blower on the indoor unit side is continued without stopping during the defrosting operation, the cool air is generated from the indoor unit. Since it does not blow out, it is possible to maintain a good indoor ventilation, and in combination with it, it is possible to secure a comfortable living environment without causing discomfort to the indoor occupants. In addition, the operation is quiet because there is no noise generated by starting and stopping the blower.

[Brief description of drawings]

FIG. 1 is a configuration diagram illustrating an operation during a heating cycle operation in a basic configuration circuit of a heat pump type air conditioner according to an embodiment of the present invention.

FIG. 2 is a configuration diagram illustrating an operation during a defrost cycle operation in a basic configuration circuit of a heat pump type air conditioner according to an embodiment of the present invention.

FIG. 3 is a basic configuration circuit diagram of a conventional heat pump type air conditioner.

[Explanation of symbols]

 1 compressor 2 indoor unit coil (heat exchanger) 3 indoor unit side blower 4 expansion valve 5 check valve 6 check valve 7 expansion valve 8 outdoor unit coil (heat exchanger) 9 outdoor unit blower (fan) 10 accumulator 11 High pressure regulator 12 Capillary 13 Hot gas bypass valve 14 Check valve 15 Expansion device A 3-way valve B 3-way valve C 4-way valve

Claims (1)

(57) [Claims] 1. In a heating circuit of a heat pump type air conditioner, a compressor 1 side, a high pressure control valve 11 and a capillary 12 are connected in parallel to the outlet side of an outdoor unit coil 8 having a blower 9. One of the three-way valve A, which communicates with the branch side of the stop valve 14 and the hot gas bypass valve 13 and shuts off the four-way valve C side, the hot gas bypass valve 13 and the accumulator 10.
To the side of the expansion device 15 that branches to and communicate with the side of the check valve 6 and the expansion valve 7 that are parallel to each other on the inlet side of the outdoor unit coil 8
The other three-way valve B that shuts off the check valve 5 in parallel with the outlet side of the indoor unit coil 2 equipped with the blower 3 and the expansion valve 4 side
And communicating the one side three-way valve A side with the outdoor unit coil 8 side,
Further, the four-way valve C that connects the accumulator 10 side and the indoor unit coil 2 side is provided, the hot gas bypass valve 13 prevents the pressure on the outlet side from becoming low, and the refrigerant returning to the accumulator 10 and A defrosting mechanism for a heat pump type air conditioner, characterized in that the flow rate of the refrigerant is adjusted so that the refrigerant sucked into the compressor 1 becomes gaseous.