JPS6238633B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat pump device, and more particularly to an improvement in a heat pump device having a gas injection circuit for reinjecting refrigerant gas into a cylinder of a compressor during compression of refrigerant.

FIG. 1 is a circuit diagram showing a conventional heat pump device that can selectively perform cooling operation and heating operation by switching a four-way valve 11.

In the figure, numeral 12 is a compressor, and compressor 1
The discharge side 12a of 2 is connected to an outdoor heat exchanger 13 via a four-way valve 11, and the outdoor heat exchanger 13 is connected to a gas-liquid separator 15 via a capillary tube 14. The gas-liquid separator 15 is further connected to an indoor heat exchanger 17 via a heating primary capillary tube 16.
The gas-liquid separator 15 is also connected to piping connecting the heating primary capillary tube 16 and the indoor heat exchanger 17 via a cooling capillary tube 18 and a cooling check valve 19.
The indoor heat exchanger 17 is connected to the compressor 12 via the four-way valve 11.
connected to the suction side of the Also, the gas-liquid separator 15
The part where the refrigerant gas is stored is connected to the cylinder part of the compressor 12 by a gas injection piping 20, thereby forming a gas injection circuit.

A two-way valve 21 is disposed in the gas injection piping 20 of such a conventional heat pump device. This two-way valve 21 is opened during heating operation and forms a gas injection circuit, thereby improving the ability of heating operation.
It is closed during cooling operation, and has the function of preventing a decrease in cooling capacity due to a large amount of refrigerant being bypassed and less refrigerant passing through the indoor heat exchanger 17.

Note that the reference numeral 22 is a check valve for release.

FIG. 2 is a circuit diagram of a conventional heat pump device that can selectively perform cooling operation, heating operation, and dehumidification operation. In the heat pump device according to this circuit diagram, the indoor heat exchanger 27 is a unit in which a main heat exchanger 23, an auxiliary heat exchanger 24, a two-way valve 25, a capillary tube 26, and a check valve 28 are arranged in a parallel circuit. It is made up of things connected by . In addition, the outdoor heat exchanger 13 and the capillary tube 14 are connected to the gas-liquid separator 15 via a two-way dehumidifying valve 29, and a two-way dehumidifying valve 30 is connected to the cooling capillary tube 18 in a parallel circuit. is installed. The other circuit configuration is the same as that shown in FIG.

The dehumidifying two-way valve 29 disposed between the outdoor heat exchanger 13 and the gas-liquid separator 15 reduces undercooling at the outlet of the auxiliary heat exchanger 24 and reduces refrigerant noise from the capillary tube 26. This causes the occurrence of This is to prevent the refrigerant from accumulating in the gas-liquid separator 15 under high pressure conditions, and the reason why the two-way valve 21 is provided in the middle of the gas injection piping 20 is to For the same reason as in the figure.

As described above, in conventional heat pump equipment, a two-way valve is installed in the middle of the gas injection piping or between the outdoor heat exchanger and the gas-liquid separator, which makes the heat pump circuit complicated and makes it difficult to maintain reliability. There are disadvantages such as reduced performance and higher price.

The present invention has been made in view of these points, and provides a heat pump device that eliminates the need for a two-way valve in the gas injection circuit by arranging the heating primary capillary tube and the check valve at appropriate positions. The purpose is to provide

Similarly, by arranging the heating primary capillary tube and check valve at appropriate locations, the two-way dehumidification valve installed between the outdoor heat exchanger and the gas-liquid separator is no longer required. The purpose is to provide a heat pump device.

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

FIG. 3 is a circuit diagram of a heat pump device according to the present invention, which is an improvement of the heat pump device shown in FIG. 1 and capable of switching between cooling and heating modes. Compressor 12
The discharge side 12a of is connected to an outdoor heat exchanger 13 via a four-way valve 11, and the outdoor heat exchanger 13 has a heating secondary capillary tube (cooling primary capillary tube) 31, a cooling secondary capillary tube 32, and Indoor heat exchanger 1 via cooling check valve 33
7 is connected. Further, the pipe 34 connecting the heating secondary capillary tube 31 and the cooling secondary capillary tube 32 is branched in the middle, and a check valve 35 is disposed in a direction to prevent the flow to the gas-liquid separator 15. It is connected to the gas-liquid separator 15. In addition, A in the middle of the pipe 36 connecting the gas-liquid separator 15, the cooling check valve 33, and the outdoor heat exchanger 17
The points are connected via a heating primary capillary tube 37. Gas-liquid separator 15 and compressor 12
is connected by a gas injection arrangement 20, but as shown in the circuit diagram of Fig. 1, a two-way valve 2
1 is not provided.

The operation of the heat pump device according to the present invention having such a configuration will be explained.

First, during heating operation, the refrigerant discharged from the compressor 12 passes through the four-way valve 11 and enters the indoor heat exchanger 1.
7, the room is heated. Indoor heat exchanger 1
The refrigerant that exits the pipe 36 passes through the heating primary capillary tube 37 from point A of the pipe 36, is reduced to an appropriate pressure, enters the gas-liquid separator 15, is separated into gas refrigerant and liquid refrigerant, and is separated into liquid refrigerant. The air enters the outdoor heat exchanger 13 through the check valve 35 and the heating secondary capillary tube 31, undergoes heat exchange, passes through the four-way valve 11, and then returns to the compressor 12. On the other hand, the gas refrigerant is injected into the compressor 12 through the gas injection piping 20, forming a gas injection cycle and improving the heating conversion capacity.

Next, during cooling operation, the refrigerant discharged from the compressor 12 passes through the four-way valve 11 to the outdoor heat exchanger 1.
3, and further passes through the cooling primary capillary tube (heating secondary capillary tube) 31 and the cooling secondary capillary tube 32 to reach point A of the piping 36. Gas injection piping 20 from point A
Since the primary heating capillary tube 37 is installed, the resistance of the piping from point A to the compressor 12 through the indoor heat exchanger 17 is higher than that of the main piping from point A to the compressor 12 through the indoor heat exchanger 17. It is larger than the piping resistance of the circuit, and the refrigerant is in the gas injection piping 2.
It does not flow to the 0 side but flows to the piping 36 side of the main circuit. Therefore, the refrigerant necessary for cooling operation flows through the indoor heat exchanger 17, and reliable cooling operation is performed. The refrigerant that has left the indoor heat exchanger 17 passes through the four-way valve 11 and returns to the compressor 12 again.

As described above, according to the heat pump device according to the present invention, normal cooling operation is possible without providing a two-way valve in the gas injection piping, and the gas injection circuit can be throttled. Therefore, the gas injection characteristics do not deteriorate and the heating operation ability is not affected at all. Furthermore, by eliminating the two-way valve in the gas injection circuit, the reliability of the heat pump device is improved as there is no abnormal noise, and the price can be significantly reduced.

FIG. 4 is a circuit diagram of a heat pump device according to the present invention, which is an improvement of the heat pump device shown in FIG. 2 and capable of switching between cooling, heating, and dehumidifying modes. The discharge side 12a of the compressor 12 is connected to an outdoor heat exchanger 13 via a four-way valve 11, and the outdoor heat exchanger 13 is connected to a piping 40 in which a cooling capillary tube 38 and a check valve 39 are disposed, and this piping 40. The indoor heat exchanger 27 is connected to the indoor heat exchanger 27 by a pipe 42 in parallel with the dehumidifying two-way valve 41. This indoor heat exchanger 27 has a two-way valve 25, a capillary tube 26, and a capillary tube 26 arranged in parallel, similar to the one in FIG.
It consists of a main heat exchanger 23 and an auxiliary heat exchanger 24 connected by a check valve 28. The middle of the piping connecting the outdoor heat exchanger 13 and the cooling capillary tube 38 and the gas-liquid separator 15 are
It is connected by piping in which a check valve 43 and a heating secondary capillary tube 44 are arranged in a direction that prevents the flow toward the gas-liquid separator 15. In addition, a gas-liquid separator 15 and an indoor heat exchanger 2
7 and the check valve 39 are connected to each other by a pipe provided with a primary heating capillary tube 46 at a midway point B of the pipe 45.
The gas-liquid separator 15 and the compressor 12 are connected by a gas injection piping 20.
The two-way valve 21 is not provided as shown in the circuit diagram.

The operation of the heat pump device according to the present invention having such a configuration will be explained.

First, during heating operation, the dehumidifying two-way valve 41
Then, the two-way valve 25 is closed, and the heat pump device operates in a gas injection cycle similar to the heat pump device shown in FIG.

During cooling operation, the two-way dehumidifying valve 41 is closed and the two-way valve 25 is opened, so that the refrigerant bypasses the gas-liquid separator 15, similar to the heat pump device shown in FIG. In this case, the refrigerant that has reached point B is subjected to piping resistance by the heating primary capillary tube 46, does not flow to the gas-liquid separator 15 side, but flows to the piping 45 side of the main circuit, and then flows to the indoor heat exchanger 27.
The required cooling operation is performed.

In addition, during dehumidification operation, the dehumidification two-way valve 41
the two-way valve 25 is closed, and the refrigerant discharged from the compressor 12 is passed through the four-way valve 11 to the outdoor heat exchanger 1.
3, and is further sent to the indoor heat exchanger 27 via piping 42, completely bypassing the cooling and heating cycles. In this case, the inside of the gas-liquid separator 15 is throttled to a low pressure by the heating primary capillary tube 46, so even if the refrigerant is stored inside the gas-liquid separator 15, no problem occurs because the pressure is low. For the refrigerant that has entered the indoor heat exchanger 27, the auxiliary heat exchanger 24 acts as a condenser, and the main heat exchanger 23 acts as an evaporator, thereby performing the desired dehumidification effect.

As described above, according to the present invention, the gas-liquid separator 1
Normal dehumidification operation can be performed without storing refrigerant in a high-pressure state in 5. Further, like the heat pump device shown in FIG. 3, normal cooling operation can be performed without disposing a two-way valve in the middle of the gas injection piping, and the heating operation capacity is not reduced. In this way, compared to the heat pump device shown in FIG. 2, the number of two-way valves can be reduced by two, the reliability of the device can be improved, and the price can be significantly reduced.

The present invention has been described above based on preferred embodiments. According to the present invention, gas injection can be performed while maintaining normal cooling, heating, and dehumidifying operations and without generating refrigerant noise. It is possible to eliminate the two-way valve in the piping or reduce the number of two-way valves for dehumidification during the dehumidification cycle, improving the reliability of the heat pump device and reducing the cost.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram of a conventional heat pump device capable of cooling and heating operations, and Figure 2 is a circuit diagram of a conventional heat pump device capable of cooling and heating operations.
Circuit diagram of a heat pump device capable of dehumidifying operation, Part 3
1 is a circuit diagram of a heat pump device of the present invention that is an improvement of the heat pump device shown in FIG. 1, and FIG. 4 is a circuit diagram of a heat pump device of the present invention that is an improvement of the heat pump device shown in FIG. 2. 11...Four-way valve, 13...Outdoor heat exchanger, 1
7, 27... Indoor heat exchanger, 15... Gas-liquid separator, 20... Gas injection piping, 37,
46... Heating primary capillary tube.

Claims (1)

[Claims] 1. It has a compressor, an outdoor heat exchanger, an indoor heat exchanger, and a gas-liquid separator, and a gas injection circuit is formed between the compressor and the gas-liquid separator. In heat pump equipment capable of cooling and heating operations,
The outdoor heat exchanger and the indoor heat exchanger are connected by piping equipped with a heating secondary capillary tube, a cooling capillary tube, and a cooling check valve. The connecting piping and the gas-liquid separator are connected by piping equipped with a check valve that prevents refrigerant from flowing into the gas-liquid separator, and the gas-liquid separator, cooling check valve, and indoor heat exchanger A heat pump device characterized in that the middle of the piping connecting the is connected by a piping provided with a heating primary capillary tube. 2. An indoor heat exchanger consisting of a compressor, an outdoor heat exchanger, a main heat exchanger, and an auxiliary heat exchanger connected by a circuit in which a two-way valve, a capillary tube, and a check valve are arranged in parallel; In a heat pump device that is capable of cooling, heating, and dehumidifying operations and has a gas-liquid separator and a gas injection circuit is formed between the compressor and the gas-liquid separator, an outdoor heat exchanger and an indoor heat exchanger are used. The cooling capillary tube is connected to the cooling capillary tube, piping equipped with a cooling check valve, and parallel piping equipped with a dehumidifying two-way valve, which connects the outdoor heat exchanger and the cooling capillary tube. The gas-liquid separator is connected to the gas-liquid separator by a check valve that prevents refrigerant from flowing into the gas-liquid separator, and a piping equipped with a heating secondary capillary tube. A heat pump device characterized in that the pipe connecting the valve and the indoor heat exchanger is connected by a pipe provided with a heating primary capillary tube.