JPS5818619Y2 - Heat pump air conditioning system - Google Patents

Description

[Detailed description of the invention] This invention relates to a heat pump type air conditioner and heating device, and in particular, the heat pump type air conditioner and heating device is capable of efficiently defrosting a heat exchanger on the heat source side without stopping heating operation, and also makes effective use of heat. Regarding.

An embodiment of the present invention will be described below with reference to the drawings.

1 is a refrigerant compressor, 2 is a four-way switching valve, 3 is a heat exchanger on the user side, 4 and 5 are a cooling pressure reducing device and a heating pressure reducing device each consisting of a capillary tube, and 6 is a cooling pressure reducing device 4 on the heating side. 7 is a pressure reducing device 5 for heating.
8 is a heat source side heat exchanger composed of a first heat source side heat exchanger 8a and a second heat source side heat exchanger 8b, which are as shown in the figure. They are connected in a ring to form a heat pump refrigerant circuit.

One end of each of the first and second heat source side heat exchangers 8 a and 8 b and the heating pressure reducing device 5 are connected via first and second defrosting solenoid valves 9 and 10, respectively. , the other ends of the second heat source side heat exchangers 8a and 8b and the four-way switching valve 2 are connected via third and fourth defrosting solenoid valves 11 and 12, respectively, and the first and second heat source side heat One end of each of the exchangers 8 a and 8 b and each other end of the second and first heat source side heat exchangers 8 b and 8 a are connected to a first defrosting check valve 13 and a first defrosting check valve made of a capillary tube, respectively. Series circuit of pressure reducing device 14, second defrosting circuit
A second defrosting valve consisting of a check valve 15 and a capillary tube
It is connected via a series circuit of the pressure reducing device 16.

Furthermore, a bypass solenoid valve 17 is connected in parallel with the heating pressure reducing device 5, and this solenoid valve 17, together with the check valve 6, is connected to the heating pressure reducing device 4.
, 5 constitute a bypass valve for bypassing during defrosting.

Further, the first and fourth solenoid valves 9 and 12 are opened and closed in conjunction with each other, and the second and third solenoid valves 10 and 11 are also opened and closed in conjunction with each other, and both groups of valves are used to defrost the heat source side heat exchanger 8. Open and close in sequence.

The embodiment is configured as described above, and the first to fourth
The solenoid valves 9, 10, 11.12 are all opened, and the side passage solenoid valve 17 is closed.

Therefore, the refrigerant is 1→2→(11→8a-)9 and 12→8
b → 10) → 7 → 4 → 3 → 2 → 1 and the flow is 1st,
The second heat source side heat exchangers 8a and 8b act as condensers, and the user side heat exchanger 3 acts as an evaporator, thereby cooling the room.

Also, during normal heating, each solenoid valve 9° 10.1
1.12 is controlled to open and close, and the refrigerant changes from 1 → 2 → 3 → 6-)
5-) (9→3 a-+ l l and 10→8b→1
The heat flows in a circular manner from 2) to 2 to 1, and the heat absorbed by the heat source side heat exchanger 8 is released by the user side heat exchanger 3, thereby heating the room.

When frost forms on the heat source side heat exchangers 8a and 8b during heating, a frost detection means (not shown) closes the second and third solenoid valves 10.11 as a first step, and closes the first and fourth solenoid valves 9.12. and open the bypass solenoid valve 17.

Then, the high-temperature refrigerant (sometimes containing gaseous refrigerant) condensed in the user-side heat exchanger 3 flows into the first heat source-side heat exchanger 8a via the first electromagnetic valve 9, and the frost in this heat exchanger 8a is removed. After melting, the pressure is reduced in the pressure reducing device 16 and the second heat source side heat exchanger 8
Evaporates at b.

After this defrosting has been carried out for a predetermined period of time, as a second step, the first and fourth solenoid valves 9 and 12 are closed while the bypass solenoid valve 17 is left as is, and the second and third solenoid valves 10 and 11 are opened.

Then, the high-temperature refrigerant in the user-side heat exchanger 3 flows into the second user-side heat exchanger 8b, melts the frost in this heat exchanger, and then evaporates in the first heat source-side heat exchanger 8b.

In this way, the first and second heat source side heat exchangers 8a and 8b are defrosted one after another while continuing the heating operation.

In such defrosting, the start and end of defrosting may be controlled by providing appropriate frost formation detection means in each of the heat source side heat exchangers 8 a and 8 b, or may be controlled periodically by an appropriate timer means. You can take turns.

In addition, the first and second heat source side heat exchangers 8 a and 8 b are defrosted sequentially, but in one defrost, 8 a → 8 b, 8 a → 8 b,
It is also possible to alternately perform this process an appropriate number of times.

Incidentally, in the above embodiment, a bypass solenoid valve 17 is provided, but
Even if this is removed, the pressure is not reduced much in the heating pressure reducing device N5 due to the presence of the pressure reducing devices 14 and 16, so defrosting of the first and second heat source side heat exchangers 8 a and 8 b is possible.

In this case, the check valve 6 acts as a bypass valve that bypasses a part of the pressure reducing device.

The present invention is configured as described above, and it is possible to sequentially defrost the first and second heat source side heat exchangers 8 a and 8 b while continuing the heating operation, and to perform efficient defrosting.
Since the refrigerant used for defrosting is a high-temperature refrigerant after heat has been radiated in the user-side heat exchanger 3, there is an effect that the heat can be used effectively without impairing the heating effect.

[Brief explanation of drawings]

The drawing is a refrigerant circuit diagram showing one embodiment of the heat pump type air-conditioning device of the present invention. 1...Compressor, 2...Switching valve, 3...
...Using side heat exchanger, 4, 5... Pressure reducing device, 6, 17... Side passage valve, 8 a, 8 b.
...First and second heat source side heat exchangers, 9, 10, 11
．． 12... Solenoid valve for defrosting, 13.15...
...Check valve for defrosting, 14.16... Pressure reducing device for defrosting.

Claims (1)

[Scope of utility model registration request] In a heat pump type refrigerant circuit in which a compressor, a four-way switching valve, a user-side heat exchanger, a pressure reducing device, and a heat source-side heat exchanger are connected in a ring, the heat source-side heat exchanger is connected to a first heat source-side heat exchanger. consisting of an exchanger and a second heat source side heat exchanger;
Each one end of the second heat source side heat exchanger and the pressure reducing device are connected via a defrosting solenoid valve, and each other end of the first and second heat source side heat exchanger and the four-way switching valve are connected respectively. It is connected via a defrosting solenoid valve, and one end of each of the first and second heat source side heat exchangers and each other end of the second and first heat source side heat exchanger are connected via a defrosting check valve and a defrosting solenoid valve. 1. A heat pump type air-conditioning/heating device, characterized in that a bypass valve is connected to a frost pressure reducing device through a series circuit and bypasses the pressure reducing device during defrosting.