JPS6143632B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat pump device, and in particular, an indoor heat exchanger has two heat exchangers, a first heat exchanger and a second heat exchanger.
This invention relates to an improvement in a heat pump device configured with two heat exchangers.

In a heat pump device that can perform heating, cooling, and dehumidifying operations, the dehumidifying operator uses reheating, that is, reheats air that has been dehumidified and cooled by passing through an evaporator, and performs only dehumidification without changing the temperature of the blown air. In order to achieve this, some indoor heat exchangers are constructed of a first heat exchanger disposed on the air suction side and a second heat exchanger disposed on the air outlet side. Conventionally, this indoor heat exchanger
As shown in the side cross section in the figure, a first heat exchanger 11 disposed on the air suction side and a second heat exchanger 12 disposed on the air outlet side are installed in the heat exchanger, respectively. Pipe positions 13a and 14a at the lowest ends of the pipes 13 and 14 are connected by a pipe circuit in which a capillary tube 15, a check valve 16, and a two-way valve 17 are arranged in parallel. It consists of a combination of things. In addition, in FIG. 1, the first heat exchanger 11 and the second heat exchanger 1
The small circles shown in 2 are pipes 13 and 14 that are installed in a meandering manner within each heat exchanger.
It shows a cross section of. This indoor heat exchanger 10
During cooling operation, refrigerant enters from the pipe position 14b at the upper end of the second heat exchanger 12, flows through the two-way valve 17 to the first heat exchanger 11, and the whole acts as an evaporator, and is sucked in. The cooled air 18a is cooled and blown into the room. Also, during dehumidification operation, the refrigerant enters from the pipe position 14b at the upper end of the second heat exchanger 12,
The first heat exchanger 1 through the capillary tube 15
Flows to 1. In this case, the first heat exchanger 11 acts as an evaporator and dehumidifies and cools the intake air 18a, and the second heat exchanger 12 acts as a condenser and reheats this dehumidified cooling air to only dehumidify it. It is blown into the room as the blown air 18b. During warm-up operation,
The refrigerant is at the pipe position 13 at the upper end of the first heat exchanger 11.
b into the heat exchanger and flows through the check valve 16 to the second heat exchanger 12. In this case, the first heat exchanger 11 and the second heat exchanger 12 act as condensers, heat the blown air 18a, and warm the blown air 18a.
B is blown into the room as b. However, with such pipes between the first heat exchanger 11 and the second heat exchanger 12, high temperature refrigerant (approximately
75°C) is exchanged with the suction air 18a to lower the temperature (approximately 50°C) and enter the second heat exchanger 12, so the high-temperature air heated in the first heat exchanger 11 becomes the second heat exchanger. The temperature of the refrigerant may be higher than or almost the same as that of the exchanger 12. Therefore, the blown air 1
8b has the disadvantage that the temperature may be lowered again in the second heat exchanger 12, or that effective heat exchange may not be performed in the second heat exchanger 12.

The present invention has been made in view of these points, and is a heat pump device in which an indoor heat exchanger is configured by two heat exchangers, a first heat exchanger and a second heat exchanger. An object of the present invention is to provide a heat pump device that can perform an effective heat exchange function at times.

The present invention provides an indoor heat exchanger with a first heat exchanger disposed on the air suction side and a second heat exchanger disposed on the air blowout side, which are thermally separated from each other and arranged in parallel. In the heat pump device in which the first heat exchanger and the second heat exchanger are each divided into a small capacity part and a large capacity part,
The small capacity section of the first heat exchanger, the large capacity section of the second heat exchanger, the large capacity section of the first heat exchanger, and the small capacity section of the second heat exchanger are successively connected through a pipe, and during heating operation, The entire indoor heat exchanger is configured as a condenser with the small capacity part of the second heat exchanger as an inlet and the small capacity part of the first heat exchanger as an outlet, and during cooling operation, the small capacity part of the first heat exchanger is configured as a condenser. The entire indoor heat exchanger is configured as an evaporator with the small capacity part of the second heat exchanger as an inlet and an outlet as the small capacity part of the second heat exchanger,
During the dehumidification operation, the inlet and outlet are the same as the inlet and outlet during the cooling operation, and the small capacity part of the first heat exchanger and the large capacity part of the second heat exchanger are used as reheaters,
It is characterized in that the large capacity section of the first heat exchanger and the small capacity section of the second heat exchanger are configured as an evaporator.

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

FIG. 2 is a side sectional view showing the structure of the indoor heat exchanger of the heat pump device according to the present invention. code 2
Reference numeral 1 indicates a first heat exchanger provided on the air suction side, and reference numeral 22 indicates a second heat exchanger provided on the air outlet side. Inside these heat exchangers, a pipe 23 through which a refrigerant flows is meandering. Although it is piped, this pipe 2
The piping and connections in No. 3 are made as follows. First, the pipe 24 connected to other equipment is
It is connected to a pipe position 23a at the lower end of the heat exchanger 22. Inside the second heat exchanger 22, the pipe 23
is piped upward for a short predetermined distance (for example, 20% of the total piping distance) from this lower end pipe position 23a, and is connected to a pipe position 23c located a predetermined distance apart from the pipe position 23c above the pipe position 23a.
A predetermined distance upward from 3c, the first heat exchanger 21
The pipe meanderingly extends downward from the upper end of the first heat exchanger 21 to a pipe position 23d separated by a short predetermined distance. From this pipe position 23d, again beyond the lower pipe position 23c, a pipe position 23 is separated upwardly by a predetermined distance from the lower end of the first heat exchanger 21.
s, and the piping is meandering from a pipe position 23e to a pipe position 23f at the lower end of the first heat exchanger 21. And this pipe position 23f
The pipe circuit 25 in which the capillary tube 15, the check valve 16, and the two-way valve 17 are arranged in parallel connects the pipe position 23g of the second heat exchanger 21 to the pipe position 23g located immediately above the pipe position 23b of the second heat exchanger 21. connected to the second heat exchanger 22 from the pipe position 23g.
The piping is arranged in a meandering manner up to the pipe position 23h at the upper end of the pipe. The pipe position 23h is connected to the pipe position 23i at the upper end of the first heat exchanger 21, and is connected to the pipe position 23i at a short predetermined distance (for example, 20% of the total piping distance) downward from the first heat exchanger 21. The piping is arranged in a meandering manner to a certain pipe position 23j, and the pipe 26 is connected to other equipment from the pipe position 23j.

FIG. 3 is a diagram showing an example of a heat pump device according to the present invention, in which an indoor heat exchanger 20 having such a pipe arrangement is installed. Reference numeral 31 indicates a compressor, and a discharge port 31a of the compressor 31
is connected to the four-way valve 32 by a pipe. four-way valve 3
2 is then connected to the outdoor heat exchanger 33, and a dehumidification check valve 34 and a dehumidification two-way valve 35 are installed in the middle of the piping connecting the outdoor heat exchanger 33 and the indoor heat exchanger 20. , a heating capillary tube 36 is disposed, and a gas-liquid separator 37, a cooling capillary tube 38, and a cooling check valve 39 are disposed in a parallel circuit with the heating capillary tube 36. Further, a capillary tube 40 is provided in a parallel circuit with the dehumidifying check valve 34 and the dehumidifying two-way valve 35, and a dehumidifying two-way valve 41 is provided in a parallel circuit with the cooling capillary tube 38. Further, a gas-liquid separator 37 is connected to an intermediate portion of the cylinder of the compressor 31 by a pipe 43 via a two-way valve 42 for gas injection. Further, the middle of the pipe 43 is connected to the middle of a pipe connecting the four-way valve 32 and the indoor heat exchanger 20 via a release check valve 44 .

The operation of the heat pump device according to the present invention having such a configuration will be explained. First, during heating operation, high-pressure refrigerant discharged from the compressor 31 enters the second heat exchanger 22 of the indoor heat exchanger 20 through the four-way valve 32. This second heat exchanger 22
In FIG. 2, the refrigerant to the second heat exchanger 22
The liquid enters the lower end pipe position 23a, and reaches the upper pipe position 23b while being condensed in a meandering manner. During this time, the refrigerant is at a high temperature (approximately 75°C). The refrigerant then flows from the pipe position 23b to the pipe device 23c of the first heat exchanger 21 and is condensed from this position to the upper pipe position 23d, during which time the refrigerant has a slightly lower temperature (approximately 50°C). . The refrigerant further flows to pipe position 23e and is condensed from pipe position 23e to pipe position 23f at the lower end of first heat exchanger 21. The temperature of the refrigerant during this period is also approximately the same as the temperature between the pipe position 23c and the pipe position 23d (approximately 50°C). The refrigerant flows through the check valve 16 to the pipe position 23g of the second heat exchanger 22, and is condensed from the pipe position 23g to the pipe position 23h at the upper end of the second heat exchanger 22. The temperature of the refrigerant during this period is almost the same as the temperature between the pipe position 23e and the pipe position 23f (approximately 50°C), but as it approaches the upper end of the second heat exchanger 22, the temperature gradually decreases.
Pipe position 23 near the top pipe position 23h
g (approximately 45°C). Then, the refrigerant flows again to the first heat exchanger 21 and is condensed between the upper pipe position 23i and the pipe position 23j. The temperature of the refrigerant during this period is even lower than the temperature near pipe position 23h (approximately 40
℃). From the pipe position 23j, the refrigerant flows through the pipe 26 to the heating capillary tube 36, enters the gas-liquid separator 37, and then flows through the capillary tube 40 to the outdoor heat exchanger 33, which functions as an evaporator. . Further, a part of the refrigerant from the gas-liquid separator 37 is injected into the compressor 31 during the compression process through the pipe 43. Outdoor heat exchanger 3
The refrigerant from 3 passes through the four-way valve 32 to the compressor 31
flows to the suction side. During such a heating operation, air for indoor heating flows from the front of the first heat exchanger 21 of the indoor heat exchanger 20 to the rear of the second heat exchanger 22 passing through these heat exchangers. In this case, the temperature of the refrigerant flowing through the opposing portions of the first heat exchanger 21 and the second heat exchanger 22 is higher than that of the refrigerant flowing through the second heat exchanger 22. Since the temperature of the refrigerant flowing therein is always equal to or higher than that of the refrigerant, the suction air 18a heated in the first heat exchanger 21 is heated again in the second heat exchanger 22, and the temperature of the second heat exchanger 22 is increased. As it passes, heat is taken away by the refrigerant and the blown air 18b is
The temperature never drops.

Next, during cooling operation, the refrigerant discharged from the compressor 31 passes through the four-way valve 32 and enters the outdoor heat exchanger 33, where it is condensed.
5 and 41 are closed, it passes through the capillary tube 40 to the gas-liquid separator 37, and passes through the cooling capillary tube 38 to the indoor heat exchanger 2.
0 into the pipe position 23j of the first heat exchanger 21. The refrigerant that enters the indoor heat exchanger 20 from the pipe position 23j evaporates to produce a cooling effect. In this case, the refrigerant passes through the two-way valve 17 to the first heat exchanger 21
Flows to the side. When the indoor temperature is high, the amount of heat exchanged by the indoor heat exchanger 20 increases, and the refrigerant evaporates near the outlet of the pipe of the indoor heat exchanger 20 (near the pipe positions 23b and 23a). If the temperature is too high, there is a risk of superheating. In this case, in this embodiment, the blown air 18a passes between the pipe positions 23f to 23e, which exhibit a sufficient cooling function, before passing through this speed-heated part, so it is dehumidified and cooled during this period. No deterioration in performance. Therefore, unlike in the prior art, air that has been sufficiently dehumidified and cooled and contains moisture will not come into contact with cold parts inside the heat pump device and cause dew condensation in these parts. The four-way valve 32 is connected to the pipe 24 from the pipe position 23a of the second heat exchanger 22.
The refrigerant sent to the compressor 31 flows into the suction side of the compressor 31 again.

In the dehumidification operation, the refrigerant discharged from the compressor 31 passes through the four-way valve 32 and enters the outdoor heat exchanger 33.
and after being condensed here, the dehumidifying check valve 3
4. Enters the gas-liquid separator 37 through the two-way dehumidifying valve 35. From this gas-liquid separator 37 to the dehumidifying two-way valve 4
1. Indoor heat exchanger 2 through the cooling check valve 39
0 flows into the pipe position 23j of the first heat exchanger 21 and flows to the pipe position 23g of the second heat exchanger 22 while being condensed. From the pipe position 23g, it passes through the capillary tube 15 to the first heat exchanger 21.
, and causes the first heat exchanger 21 to function as an evaporator. Therefore, the suction air 18a is dehumidified and cooled when passing through the first heat exchanger 21, and is reheated while being dehumidified in the second heat exchanger 22. In this case, the part used as evaporator and the part used for reheating are equal, so
The temperature difference between the intake air 18a and the blown air 18b is kept almost constant, and the indoor air temperature does not drop during the dehumidification operation. In addition, when the indoor temperature is low and the temperature is high during dehumidification operation, the amount of heat exchanged by the indoor heat exchanger 20 becomes small, and the area near the outlet of the indoor heat exchanger 20 (near the pipe positions 23b and 23a) In this case, the refrigerant may not be completely evaporated and may be sucked into the compressor 31 as a liquid refrigerant, but in this embodiment, the pipe positions 23b to 23a are located below the pipe positions 23h to 23g used for reheating. Since the pipe is located adjacent to
The refrigerant is heated by the heat transfer effect from around 3g, and the refrigerant passing through the pipe position 23a is almost completely evaporated. As a result, the vaporized refrigerant is sucked into the compressor 31, and it is possible to prevent the compressor from being damaged due to liquid compression due to suction of the liquid refrigerant as in the conventional case. The refrigerant coming out of the pipe position 23a at the lower end of the second heat exchanger 22 flows into the four-way valve 32 and flows into the suction side of the compressor 31.

In the heat pump device shown in Figure 3,
During cooling and dehumidifying operations, the refrigerant that is being compressed can be returned to the suction side of the compressor 31 through the release check valve 44, thereby reducing the suction volume of the compressor 31 and reducing the compressor during cooling and dehumidifying operations. can reduce the inlet.

As described above, according to the heat pump device of the present invention, the indoor heat exchanger can be efficiently used as a condenser during heating operation, and at the same time, good cooling effect can be achieved while preventing dew condensation during cooling operation. Moreover, during dehumidification operation, dehumidification can be performed while maintaining a good reheating effect.

In the description of the embodiments of the present invention, a heat pump device is shown that has a gas injection circuit and a circuit that can return the compressed refrigerant to the suction side of the compressor midway, but the present invention It can also be used in a general heat pump device that does not have such a gas injection circuit.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a conventional indoor heat exchanger, FIG. 2 is a side sectional view of an indoor heat exchanger according to the present invention,
FIG. 3 is a circuit diagram showing an example of a heat pump device according to the present invention. 15... Capillary tube, 16... Check valve, 17... Two-way valve, 18a... Suction air, 18
b... Blowing air, 20... Indoor heat exchanger, 21
...First heat exchanger, 22 ...Second heat exchanger, 23
... Pipe, 31 ... Compressor, 32 ... Four-way valve,
33... Outdoor heat exchanger, 37... Gas-liquid separator.

Claims (1)

[Claims] 1. An indoor heat exchanger is formed by a first heat exchanger disposed on the air suction side and a second heat exchanger disposed on the air outlet side, which are thermally separated from each other and arranged in parallel. In the heat pump device, the first heat exchanger and the second heat exchanger are each divided into a small capacity part and a large capacity part, and the small capacity part of the first heat exchanger and the large capacity part of the second heat exchanger are divided into a small capacity part and a large capacity part of the second heat exchanger. Capacity part, 1st
The large-capacity section of the heat exchanger and the small-capacity section of the second heat exchanger are connected in sequence through a pipe, and during heating operation, the small-capacity section of the second heat exchanger is connected to the inlet, and the small-capacity section of the first heat exchanger is connected to the small-capacity section of the first heat exchanger. As an outlet, the entire indoor heat exchanger is configured as a condenser, and during cooling operation, the small capacity part of the first heat exchanger is used as an inlet, and the small capacity part of the second heat exchanger is used as an outlet. It is configured as an evaporator, the inlet and outlet are the same as the inlet and outlet during the cooling operation during dehumidification operation, and the small capacity part of the first heat exchanger and the large capacity part of the second heat exchanger are used as reheaters, A heat pump device characterized in that a large capacity section of a first heat exchanger and a small capacity section of a second heat exchanger are configured as an evaporator.