JP2003207227A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner capable of securing the refrigerant dryness at an inlet of a reheater while preventing the shortage of the refrigerant in a reheating dehumidifying operation, and securing the sufficient reheatability. <P>SOLUTION: A gas storing part 25 of a receiver 20 is communicated to an upstream side of an indoor heat exchanger 10 by a communication passage 23, and a switching mechanism 24 is mounted on the communication passage 23. In the reheating dehumidifying operation, the gas refrigerant from the gas storing part 25 of the receiver 20 is supplied to a first heat exchanger 11 having reheating function, when the switching mechanism 24 is opened. Accordingly, the refrigerant dryness at the inlet of the first heat exchanger 11 is increased, and the reheating amount can be increased. As the discharged refrigerant from the compressor 1 is passed through an outdoor heat exchanger 6, the retaining of the refrigerant in the outdoor heat exchanger 6 can be prevented, and the sufficient refrigerant circulation can be secured. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an air conditioner capable of reheat dehumidification, and more particularly to an air conditioner capable of improving reheat capacity.

[0002]

2. Description of the Related Art An example of a conventional air conditioner capable of reheat dehumidification is shown in FIG. This air conditioner has a compressor 5
The discharge pipe 52 and the suction pipe 53 of No. 1 are connected to a pair of primary ports of the four-way switching valve 54, and one secondary port of the four-way switching valve 54 is sequentially provided with the first gas pipe 55 and the outdoor heat exchange. Bowl 5
6, the first liquid pipe 57, the main electric expansion valve 58, the second liquid pipe 59,
The indoor heat exchanger 60 and the second gas pipe 64 are connected to each other
The gas pipe 64 is connected to the other secondary port of the four-way switching valve 54 to form a refrigerant circuit. The indoor heat exchanger 60
Is divided into a first heat exchanger 61 on the second liquid pipe 59 side and a second heat exchanger 62 on the second gas pipe 64 side, and the indoor electric expansion valve 63 is provided between the heat exchangers 61, 62. Is installed. Further, a receiver 65 is interposed in the first liquid pipe 57.

In this air conditioner, the outdoor heat exchanger 56 functions as a condenser while the indoor heat exchanger 56 functions as an evaporator to perform cooling operation, and the indoor heat exchanger 60 functions as a condenser. While functioning, the outdoor heat exchanger 56 functions as an evaporator to perform heating operation. Further, in the cooling operation mode, the first heat exchanger 61 functions as a condenser while the second heat exchanger 62 functions as an evaporator in a state where the main electric expansion valve 58 is set to a large opening degree, whereby reheat dehumidification is performed. It is possible to drive.

In the air conditioner as described above, the receiver 65 provided between the outdoor heat exchanger 56 and the main electric expansion valve 58 temporarily stores the excess refrigerant and separates it into gas and liquid, This is for making the refrigerant flowing from the receiver 65 to the main electric expansion valve 58 into a liquid state, thereby improving the efficiency of the refrigeration cycle during the cooling operation. However, in this type of air conditioner, during reheat dehumidification operation,
The liquid refrigerant is supplied to the indoor heat exchanger 60. That is, in the reheat dehumidification operation, in order to secure the reheat capacity, it is necessary to supply the refrigerant in the gas-liquid two-layer state to the first heat exchanger 61, while In the harmony machine, as shown in FIG. 13 and FIG.
Since the liquid refrigerant is supplied from the bottom side of the receiver 65, the dryness of the refrigerant at the inlet of the first heat exchanger 61 becomes small, and almost the liquid single phase is condensed, so that the reheat amount decreases. The problem arises.

In order to solve the above problems, Japanese Patent Laid-Open No. 6-2
In Japanese Patent Publication No. 07763 and Japanese Patent Laid-Open No. 7-294059, an air conditioner having a configuration as shown in FIG. 15 is proposed. This is a structure in which, in an air conditioner having the same configuration as in FIG. 12, a bypass passage 66 that connects the discharge side of the compressor 51 and the second liquid pipe 59 is provided, and a bypass valve 67 is provided in this bypass passage 66. belongs to. In this air conditioner, during the reheat dehumidifying operation, the compressor 5
Refrigerant discharged from No. 1 is the outdoor heat exchanger 56 and the receiver 6
5. Bypassing the main electric expansion valve 58, the bypass path 6
6 to the indoor heat exchanger 60 to secure the dryness of the refrigerant at the inlet of the first heat exchanger 61 and increase the amount of reheat.

[0006]

However, in the air conditioner shown in FIG. 15, a part of the gas refrigerant discharged from the compressor 51 flows into the outdoor heat exchanger 56, and the outdoor heat exchanger 5 is discharged.
There is a problem in that it accumulates inside 6.
That is, since the capacity of the outdoor heat exchanger 56 is relatively large, it is unavoidable that the accumulated amount becomes considerable. Moreover, under a condition where the outside air temperature is low, the first heat exchanger 61 needs a much larger amount of reheat, but in such a case, the condensation in the outdoor heat exchanger 56 is caused by the low outside air temperature. However, there is a problem that a shortage of the refrigerant occurs as a result.

The present invention has been made to solve the above-mentioned conventional problems, and an object thereof is to avoid a shortage of the refrigerant at the time of performing the reheat dehumidifying operation and at the reheater inlet. Another object of the present invention is to provide an air conditioner capable of ensuring the dryness of the refrigerant and ensuring a sufficient reheat capacity.

[0008]

Therefore, in the air conditioner of claim 1, the refrigerant discharged from the compressor 1 is transferred to the outdoor heat exchanger 6,
A refrigerant circuit that passes the receiver 20, the main decompression mechanism 8, and the indoor heat exchanger 10 and returns to the compressor 1 is configured, and the indoor heat exchanger 10 is a first heat exchanger 11 and a second heat exchanger. 1
It is an air conditioner that is divided into two parts and has an indoor decompression mechanism 13 interposed between both heat exchangers 11 and 12, wherein the gas reservoir 25 of the receiver 20 is connected to the indoor heat exchanger 10
Is provided with a communication passage 23 that communicates with the upstream side of the
The opening and closing mechanism 24 is provided in the third member 3.

According to the air conditioner of the first aspect, when the opening / closing mechanism 24 is opened during the reheat dehumidifying operation, the gas refrigerant from the gas reservoir 25 of the receiver 20 performs the reheat function. 1 Heat exchanger 11 is supplied. Therefore, the first
The dryness of the refrigerant at the inlet of the heat exchanger 11 is increased, and the amount of reheat can be increased. Further, at this time, since the refrigerant discharged from the compressor 1 passes through the outdoor heat exchanger 6, the outdoor heat exchanger 6
It is possible to prevent the refrigerant from accumulating in the refrigerant and to secure a sufficient refrigerant circulation amount.

In the air conditioner of claim 2, the refrigerant discharged from the compressor 1 is returned to the compressor 1 through the outdoor heat exchanger 6, the receiver 20, the main decompression mechanism 8 and the indoor heat exchanger 10. A refrigerant circuit for causing the flow is formed, and the indoor heat exchanger 10 is first
An air conditioner that is divided into a heat exchanger 11 and a second heat exchanger 12, and an indoor decompression mechanism 13 is provided between the heat exchangers 11 and 12, wherein the outdoor heat exchanger 6 and the receiver are provided. It is characterized in that a communication passage 33 that communicates a position between the heat exchanger 20 and the interior heat exchanger 20 with the upstream side of the indoor heat exchanger 10 is provided, and an opening / closing mechanism 34 is provided in the communication passage 33.

According to the air conditioner of the second aspect, when the opening / closing mechanism 34 is opened during the reheat dehumidifying operation, the gas refrigerant from the outdoor heat exchanger 6 performs the first heat fulfilling the reheat function. It is supplied to the exchanger 11. Therefore, the first heat exchanger 11
The degree of dryness of the refrigerant at the inlet of is increased, and the amount of reheat can be increased. Further, at this time, since the refrigerant discharged from the compressor 1 passes through the outdoor heat exchanger 6, it is possible to prevent the refrigerant from accumulating in the outdoor heat exchanger 6 and to secure a sufficient refrigerant circulation amount.

An air conditioner according to a third aspect of the present invention is the communication passage 2 described above.
The downstream side of 3, 33 is connected to the downstream side of the main pressure reducing mechanism 8, and the main pressure reducing mechanism 8 is characterized in that its opening can be adjusted.

In the air conditioners of claims 1 and 2, the downstream side of the communication passages 23 and 33 is located downstream of the main pressure reducing mechanism 8 (between the main pressure reducing mechanism 8 and the indoor heat exchanger 10). However, it can also be connected to the upstream side of the main decompression mechanism 8.
However, as in claim 3, the communication passages 23, 33
If the downstream side of the main decompression mechanism 8 is connected to the downstream side (between the main decompression mechanism 8 and the indoor heat exchanger 10), the opening degree of the main decompression mechanism 8 can be adjusted to adjust the first heat exchanger. The amount of liquid refrigerant supplied to 11 can be adjusted. Therefore, the dryness of the refrigerant at the inlet of the first heat exchanger 11 can be adjusted, and highly accurate control can be performed. Further, if the opening / closing mechanisms 24 and 34 are configured so that their opening degrees can be adjusted as in claim 4, the opening degree of both the main decompression mechanism 8 and the opening / closing mechanisms 24 and 34 can be adjusted to determine the refrigerant circulation amount. First heat exchanger 11
Both the dryness of the refrigerant at the inlet of the control valve can be controlled, and the control accuracy is further improved.

In the air conditioner of claim 5, the refrigerant discharged from the compressor 1 is returned to the compressor 1 through the outdoor heat exchanger 6, the receiver 20, the main decompression mechanism 8 and the indoor heat exchanger 10. A refrigerant circuit for causing the flow is formed, and the indoor heat exchanger 10 is first
An air conditioner that is divided into a heat exchanger 11 and a second heat exchanger 12, and an indoor pressure reducing mechanism 13 is provided between the heat exchangers 11 and 12, and the receiver 20 is an outdoor heat exchanger. An inflow pipe 21 through which the refrigerant from the vessel 6 flows and an outflow pipe 42 through which the refrigerant flows out to the main decompression mechanism 8 are provided. The outflow pipe 42 opens at the gas reservoir 25 in the receiver 20 and It is characterized in that it is configured to pass through the liquid reservoir 26 in the middle, and a through hole 43 is provided in a portion passing through the liquid reservoir 26.

According to the air conditioner of the fifth aspect, the refrigerant flowing out to the main decompression mechanism 8 is appropriately selected with an area ratio of the opening area of the through hole 43 and the opening area of the gas reservoir 25. When the gas and liquid are mixed, the first heat exchanger 1
The dryness of the refrigerant at the inlet of No. 1 can be increased to secure a sufficient amount of reheat. Further, since the refrigerant discharged from the compressor 1 passes through the outdoor heat exchanger 6, it is possible to prevent the refrigerant from accumulating in the outdoor heat exchanger 6 and to secure a sufficient refrigerant circulation amount.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Next, specific embodiments of the air conditioner of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a first embodiment, but this air conditioner connects the discharge pipe 2 and the suction pipe 3 of the compressor 1 to a pair of primary ports of a four-way switching valve 4, and Switching valve 4
The first gas pipe 5, the outdoor heat exchanger 6, the first liquid pipe 7, the main electric expansion valve (main decompression mechanism) 8, the second liquid pipe 9, the indoor heat exchanger 10, in that order to one of the secondary ports. The second gas pipe 14 is connected, and the second gas pipe 14 is connected to the other secondary port of the four-way switching valve 4 to form a refrigerant circuit. The indoor heat exchanger 10 includes a first heat exchanger (reheater or indoor condenser) 11 on the second liquid pipe 9 side and a second heat exchanger (dehumidifier or indoor evaporation) on the second gas pipe 14 side. And an internal electric expansion valve (indoor decompression mechanism) between the two heat exchangers 11 and 12.
13 is provided. Further, a receiver 20 is provided in the first liquid pipe 7.

As shown in FIGS. 1 and 2, the receiver 20 is in the shape of a closed container, and an inflow pipe 21 into which the refrigerant flows from the outdoor heat exchanger 6 is connected to the top of the receiver 20 and the bottom thereof. Is connected to an outflow pipe 22 through which the refrigerant flows toward the main electric expansion valve 8. Further, at the top of the receiver 20, a communication passage 23 that connects the upper portion of the receiver 20 to the downstream side of the main electric expansion valve 8 (the second liquid pipe 9 between the main electric expansion valve 8 and the indoor heat exchanger 10). Is connected to this communication pipe 2
3 is a flow control valve 24 as an opening / closing mechanism as shown in the figure.
Is installed. That is, inside the receiver 20, the inflow pipe 21 opens into the gas reservoir 25 formed on the upper side of the receiver 20, and the outflow pipe 22 further forms the liquid reservoir 26 formed on the bottom side thereof. The communication pipe 23 is opened inside the gas reservoir 25.

In this air conditioner, the flow rate control valve 24
Is closed, and the indoor electric expansion valve 13 is
Normal cooling and heating operation is performed while maintaining a large opening (fully opened). That is, while the outdoor heat exchanger 6 functions as a condenser, the indoor heat exchanger 10 functions as an evaporator to perform cooling operation, and the indoor heat exchanger 10 functions as a condenser, while the outdoor heat exchange is performed. The heating operation is performed by causing the container 6 to function as an evaporator. In this case, since the flow rate control valve 24 is closed, in the cooling operation, the gas-liquid separated liquid refrigerant flows out from the outflow pipe 22 to the indoor heat exchanger 10 to form an efficient refrigeration cycle. .

The reheat dehumidifying operation is performed by circulating the refrigerant discharged from the compressor 1 from the outdoor heat exchanger 6 to the indoor heat exchanger 10. That is, the main electric expansion valve 8 and the flow rate control valve 24 are set to control openings, the outdoor fan (not shown) is stopped (or low speed), the opening of the indoor electric expansion valve 13 is controlled, and the first heat exchange is performed. The reheat dehumidification operation is performed by causing the second heat exchanger 12 to function as an evaporator while the device 11 functions as a condenser. That is, while the room air is cooled by the second heat exchanger 12 to perform dehumidification,
This cooled air is heated by the first heat exchanger 11 and supplied to the room, or another room air is heated by the first heat exchanger 1
It is heated by 1 and mixed with the air which has been cooled and dehumidified by the second heat exchanger 12 and supplied to the room. At this time, the opening degree of the main electric expansion valve 8 and the flow control valve 24 is controlled,
By separately controlling the outflow amounts of the gas refrigerant and the liquid refrigerant, the excess refrigerant is accumulated in the receiver 20, and the refrigerant dryness at the inlet of the first heat exchanger (reheater) 11 is increased, A sufficient amount of reheat can be secured.

Next, a method for controlling the opening degree of the main electric expansion valve 8 and the flow control valve 24 will be briefly described. First, when adjusting the refrigerant circulation amount of the entire refrigerant circuit (system), the main electric expansion valve 8 and the flow rate control valve 24 are controlled to be opened and closed by an equal amount. As shown in FIG. 10, when the valve opening degree increases, the refrigerant circulation amount increases, and when the valve opening degree decreases, the refrigerant circulation amount decreases. Further, when adjusting the amount of reheat, the main electric expansion valve 8 and the flow control valve 24 are controlled to be opened and closed by an equal amount in opposite directions. As shown in FIG. 10, when the opening degree of the flow control valve 24 is increased and the opening degree of the main electric expansion valve 8 is decreased, the dryness of the refrigerant at the inlet of the first heat exchanger 11 is increased and the reheat amount is increased. If the opening degree of the flow control valve 24 is decreased and the opening degree of the main electric expansion valve 8 is increased on the contrary, the first
The dryness of the refrigerant at the inlet of the heat exchanger 11 is reduced, and the amount of reheat is reduced. Practically, the optimum opening is selected in consideration of both the refrigerant circulation amount and the refrigerant dryness.

According to the above-mentioned air conditioner, during the reheat dehumidifying operation, while ensuring the circulation of the refrigerant, the dryness of the refrigerant at the inlet of the first heat exchanger (reheater) 11 is ensured, which is sufficient. It is possible to secure a good reheat capacity. For example, in FIG.
As shown in FIG. 1, in the conventional air conditioner (FIG. 12), only a small reheat capacity (a in the figure) was obtained.
According to the air conditioner of the above-described embodiment, a large reheat capacity (illustrated in b) can be obtained by improving the dryness.

FIG. 3 shows a modified example of the receiver 20, which is a horizontally long receiver 20. Also,
FIG. 4 shows a modified example of the outflow pipe 22. In this case, the outflow pipe 22 is inserted from the top of the receiver 20 into the inside thereof and opened near the bottom of the liquid reservoir 26. In any of these cases, the same actions and effects as above can be obtained. Further, FIG. 5 shows a modified example in which an electromagnetic opening / closing 27 is used in place of the flow rate control valve 24, and if it is carried out in such a mode, its configuration can be simplified, so that it can be implemented at low cost. In addition to the above, there is an advantage that the control configuration can be simplified. Further, FIG. 6 shows a modified example using the bridge circuit 28 using four check valves. This is because the receiver 20 is positioned on the high pressure side not only during cooling but also during heating. It has a structure that allows it to function. Also in this air conditioner, the same actions and effects as above can be obtained.

Next, a second embodiment will be described. As shown in FIG. 7, this is the outdoor heat exchanger 6 and the receiver 2.
The position between 0 and 0 is connected to the position between the main electric expansion valve 8 and the indoor heat exchanger 10 via the communication passage 33. Also in this case, a flow rate control valve 34 is provided in the communication passage 33. Also in this embodiment, during the reheat dehumidifying operation, the main electric expansion valve 8 and the flow control valve 24
By controlling the opening degrees of the same as in the first embodiment and separately controlling the outflow amounts of the gas refrigerant from the outdoor heat exchanger 6 and the liquid refrigerant from the receiver 20, the excess refrigerant is received by the receiver. It is possible to secure a sufficient amount of reheat by increasing the dryness of the refrigerant at the inlet of the first heat exchanger (reheater) 11 while storing a sufficient amount of refrigerant circulation in 20. .

A third embodiment is shown in FIGS. 8 and 9. This embodiment is characterized by the structure of the outflow pipe 42 of the receiver 20. This receiver 20
Similarly to the above, includes an inflow pipe 21 into which the refrigerant from the outdoor heat exchanger 6 flows, and an outflow pipe 42 from which the refrigerant flows to the main electric expansion valve 8. The outflow pipe 42 is generally U-shaped, and is inserted from the top of the receiver 20 to the inside. The inner end of the outflow pipe 42 is connected to the receiver 20.
While having an opening 44 in the gas reservoir 25 inside,
The middle part is curved downward and passes through the liquid reservoir 26. In this outflow pipe 42, a through hole 43 is provided in a portion that passes through the liquid reservoir 26. This through hole 4
3 has an opening area of the opening 4 in the gas reservoir 25.
It is designed to be sufficiently smaller than the area of 4. That is, the area ratio is selected so that the refrigerant flowing out to the main electric expansion valve 8 is in a gas-liquid mixed state. Also in this embodiment, the dryness of the refrigerant at the inlet of the first heat exchanger (reheater) 11 can be increased to secure a sufficient amount of reheat. Further, since the refrigerant discharged from the compressor 1 passes through the outdoor heat exchanger 6, it is possible to prevent the refrigerant from accumulating in the outdoor heat exchanger 6 and to secure a sufficient refrigerant circulation amount.

Although specific embodiments of the air conditioner of the present invention have been described above, the air conditioner of the present invention is not limited to the above-mentioned embodiments, and various modifications may be made. Is possible. For example, in the above, using the main electric expansion valve 8 and the indoor electric expansion valve 13,
Although the opening can be adjusted, the opening may be fixed. Further, in the air conditioner, the downstream sides of the communication passages 23 and 33 are connected to the downstream side of the main pressure reducing mechanism 8, that is, the position between the main pressure reducing mechanism 8 and the indoor heat exchanger 10. The downstream side of the communication passages 23 and 33 can also be connected to the upstream side of the main pressure reducing mechanism 8.

[0026]

According to the air conditioner of the first and second aspects, the first aspect of performing the reheat function during the reheat dehumidifying operation.
The degree of dryness of the refrigerant at the inlet of the heat exchanger is increased, the amount of reheat can be increased, the accumulation of refrigerant in the outdoor heat exchanger can be suppressed, and a sufficient amount of refrigerant circulation can be secured. The air-conditioning use comfort of can be improved.

According to the air conditioner of the third aspect, the amount of liquid refrigerant supplied to the first heat exchanger can be adjusted by the main pressure reducing mechanism, so that the dryness of the refrigerant at the inlet of the first heat exchanger can be controlled. Since it can be adjusted, highly accurate control can be performed, and the comfort of using the air conditioning during the reheat dehumidification operation can be improved.

According to the air conditioner of the fourth aspect, both the refrigerant circulation amount and the refrigerant dryness at the inlet of the first heat exchanger 11 can be controlled, the control accuracy thereof is further enhanced, and the reheat dehumidification operation is performed. It is possible to further improve the comfort of using the air conditioner.

According to the air conditioner of the fifth aspect, the refrigerant flowing out to the main pressure reducing mechanism is in a gas-liquid mixed state.
The dryness of the refrigerant at the inlet of the heat exchanger is increased, and a sufficient amount of reheat can be secured. Further, it is possible to prevent the refrigerant from accumulating in the outdoor heat exchanger, and to secure a sufficient refrigerant circulation amount. Therefore, the comfort of using the air conditioning during the reheat dehumidification operation can be improved.

[Brief description of drawings]

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

FIG. 2 is a schematic diagram of the structure of a receiver used in the above embodiment.

FIG. 3 is a schematic view of another structure of the receiver used in the above embodiment.

FIG. 4 is a schematic view of still another structure of the receiver used in the above embodiment.

FIG. 5 is a schematic view of still another structure of the receiver used in the above embodiment.

FIG. 6 is a circuit diagram showing a modified example of the refrigerant circuit of the first embodiment.

FIG. 7 is a refrigerant circuit diagram showing a second embodiment of the air conditioner of the present invention.

FIG. 8 is a schematic view of the structure of a receiver used in the third embodiment of the air conditioner of the present invention.

FIG. 9 is an enlarged schematic view showing a main part of the receiver.

FIG. 10 is a schematic diagram for explaining the opening control directions of the main electric expansion valve and the flow rate control valve in the first embodiment.

FIG. 11 is a Mollier diagram showing the effect of the first embodiment in comparison with a conventional example.

FIG. 12 is a refrigerant circuit showing a conventional example.

FIG. 13 is a schematic view of the structure of a receiver used in the above-mentioned conventional example.

FIG. 14 is a schematic view of another structure of the receiver used in the above-mentioned conventional example.

FIG. 15 is a refrigerant circuit diagram of another conventional example.

[Explanation of symbols]

1. Compressor 6. Outdoor heat exchanger 8. Main decompression mechanism (main electric expansion valve) 10. Indoor heat exchanger 11. First heat exchanger 12. Second heat exchanger 13. Indoor decompression mechanism (indoor electric expansion valve) 20. Receiver 21. Inflow pipe 23. Communication passage 24. Open / close mechanism (flow control valve) 25. Gas reservoir 26. Liquid reservoir 33. Communication passage 34. Open / close mechanism (flow control valve) 42. Outflow pipe 43. Through hole

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Ryusaburo Yajima             1304 Kanaoka-cho, Sakai City, Osaka Prefecture Daikin Industries             Sakai Plant Kanaoka Factory

Claims (5)

[Claims] 1. A refrigerant discharged from a compressor (1) is supplied to an outdoor heat exchanger (6), a receiver (20), a main pressure reducing mechanism (8),
A refrigerant circuit for passing the indoor heat exchanger (10) and returning it to the compressor (1) is constituted, and the indoor heat exchanger (10) is provided.
The air conditioner in which the first heat exchanger (11) and the second heat exchanger (12) are divided and the indoor pressure reducing mechanism (13) is interposed between the two heat exchangers (11) and (12). A communication passageway (23) for communicating the gas reservoir (25) of the receiver (20) with the upstream side of the indoor heat exchanger (10) is provided, and an opening / closing mechanism (23) is provided in the communication passageway (23). 24) An air conditioner characterized by being installed. 2. The refrigerant discharged from the compressor (1) is supplied to an outdoor heat exchanger (6), a receiver (20), a main pressure reducing mechanism (8),
A refrigerant circuit for passing the indoor heat exchanger (10) and returning it to the compressor (1) is constituted, and the indoor heat exchanger (10) is provided.
The air conditioner in which the first heat exchanger (11) and the second heat exchanger (12) are divided and the indoor pressure reducing mechanism (13) is interposed between the two heat exchangers (11) and (12). A communication passage (33) for communicating the position between the outdoor heat exchanger (6) and the receiver (20) with the upstream side of the indoor heat exchanger (10) is provided. 33) An air conditioner having an opening / closing mechanism (34) provided in (33). 3. The downstream side of the communication passages (23) (33) is connected to the downstream side of the main decompression mechanism (8), and the main decompression mechanism (8) is configured so that its opening can be adjusted. The air conditioner according to claim 1 or 2, characterized in that. 4. The air conditioner according to claim 3, wherein the opening / closing mechanisms (24) (34) are configured so that their opening degrees can be adjusted. 5. The refrigerant discharged from the compressor (1) is supplied to an outdoor heat exchanger (6), a receiver (20), a main pressure reducing mechanism (8),
A refrigerant circuit for passing the indoor heat exchanger (10) and returning it to the compressor (1) is constituted, and the indoor heat exchanger (10) is provided.
The air conditioner in which the first heat exchanger (11) and the second heat exchanger (12) are divided and the indoor pressure reducing mechanism (13) is interposed between the two heat exchangers (11) and (12). The receiver (20) includes an inflow pipe (21) into which the refrigerant from the outdoor heat exchanger (6) flows and an outflow pipe (42) into which the refrigerant flows out to the main decompression mechanism (8). The above-mentioned outflow pipe (4
2) is configured to open to the gas reservoir (25) in the receiver (20) and pass through the liquid reservoir (26) in the middle, and a through hole is formed in the portion passing through the liquid reservoir (26). An air conditioner comprising (43).