JP2011163674A - Reversible receiver and air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reversible receiver capable of suppressing excessive increase in refrigerant pressure during heating operation even when the number of indoor units is reduced in a multi-type air conditioner, and the air conditioner. <P>SOLUTION: The reverse direction receiver includes: a container 51 storing a refrigerant therein; one piping 52A which is extended from the lower side to the upper side of the container 51 and has an opening 53A at an upper end thereof and through which the air conditioner makes a refrigerant flow in to the container 51 during cooling operation and makes the refrigerant flow out from the container 51 during heating operation; and the other piping 52B which is extended from the lower side to the upper side of the container 51 and has an opening 53B at an upper end thereof and through which the air conditioner makes the refrigerant flow out from the container 51 during cooling operation and makes the refrigerant flow in to the container 51 during heating operation. The one piping 52A is extended to a more upper side compared to the other piping 52B, and a communication hole 54 interconnecting the one piping 52A and inside of the container 51 is provided on a lateral face in a region of the one piping 52A arranged within the container 51. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a reversible direction receiver and an air conditioner suitable for application to an air conditioner that is operated in a heat pump refrigeration cycle in which the direction in which refrigerant flows is switched.

  In general, in an air conditioner that employs a heat pump refrigeration cycle that switches between a cooling operation and a heating operation by switching the direction in which the refrigerant flows, it is known that the optimum refrigerant amount changes. Therefore, such an air conditioner is provided with a reversible direction receiver, which is a component that temporarily stores (holds) excess refrigerant, so that the amount of refrigerant circulating through the air conditioner is optimized. It is adjusted (for example, refer patent document 1).

  For example, in a multi-type air conditioner that includes a plurality of indoor units for one outdoor unit, a refrigerant that is temporarily stored during the cooling operation is temporarily stored (held) in the receiver, and a refrigerant that is excessive during the heating operation. Is controlled so that the amount of circulating refrigerant is optimized by slightly opening (slightly opening) the electronic expansion valve relating to the indoor unit in which the heating operation is stopped and holding it in the indoor heat exchanger.

JP-A-10-170107

However, when the number of indoor units in the multi-type air conditioner decreases, there is a problem that the refrigerant pressure in the indoor unit during heating operation becomes excessively high.
That is, when the number of indoor units decreases, the number of indoor heat exchangers that can be used for holding the refrigerant during the heating operation also decreases. As a result, the ability to adjust the amount of refrigerant circulating during heating operation may be reduced. In other words, since the amount of refrigerant that can be held during the heating operation is reduced, there is a risk that the refrigerant pressure in the portion where the refrigerant becomes high during the heating operation, for example, the refrigerant pressure in the indoor heat exchanger during the heating operation, becomes excessively high.

  The present invention has been made to solve the above problems, and in a multi-type air conditioner, even if the number of indoor units is reduced, an excessive increase in the refrigerant pressure during heating operation can be suppressed. It aims at providing a reversible direction receiver and an air conditioner.

In order to achieve the above object, the present invention provides the following means.
The reversible direction receiver of the present invention is a reversible direction receiver used in a heat pump type air conditioner capable of reversibly switching the flow direction of the refrigerant, and includes a container for storing the refrigerant therein, and a lower part of the container. One pipe extending upward and having an opening at the upper end, allowing the air conditioner to flow the refrigerant into the container during cooling operation, and to flow the refrigerant out of the container during heating operation, and below the container And the other pipe that has the opening at the upper end and that allows the air conditioner to flow out the refrigerant from the container during cooling operation and to flow the refrigerant into the container during heating operation. The one pipe extends above the other pipe, and a side surface of an area of the one pipe arranged in the container has the one pipe connected to the side. Communication hole connecting the inside of the fine said container is provided, the other pipe is characterized in that it is connected to the pressure of the refrigerant in the air conditioner to the throttle mechanism for decompressing.

According to the present invention, the reversible direction receiver can temporarily store (hold) the liquid refrigerant during the heating operation or the cooling operation of the air conditioner in which the refrigerant flow direction is switched.
That is, during the heating operation, the refrigerant in which the gas refrigerant and the liquid refrigerant decompressed by the throttle mechanism are mixed flows into the reversible direction receiver through the other pipe. The gaseous refrigerant flows into the pipe from the opening formed at the upper end of one pipe and flows out from the reversible receiver. Most of the liquid refrigerant is held inside the container. A part of the liquid refrigerant flows into the pipe together with a lubricant (for example, lubricating oil) contained in the liquid refrigerant from a communication hole formed on the side surface of one pipe and flows out from the reversible receiver. Therefore, the liquid refrigerant can be held in the reversible direction receiver even during the heating operation of the air conditioner.

On the other hand, during the cooling operation, the flow direction of the refrigerant is reversed from that during the heating operation, and the liquid refrigerant condensed by the heat exchanger flows into the reversible direction receiver through one pipe. The liquid refrigerant flows into the throttle mechanism through the other pipe. However, since the flow rate of the liquid refrigerant passing through the throttle mechanism is limited, excess liquid refrigerant is accumulated in the reversible receiver. Therefore, the reversible direction receiver can temporarily store the liquid refrigerant during the cooling operation.
Furthermore, as compared with the reversible direction receiver described in the prior art document, there is no partition plate that divides the region where one pipe is arranged inside the container and the region where the other pipe is arranged. The flow resistance when the refrigerant passes through the reversible receiver is reduced.

  In the above invention, it is preferable that the opening and the communication hole in the other pipe are arranged in the vicinity of the lower end of the container, and the opening in the one pipe is arranged in the vicinity of the upper end of the container.

According to the present invention, during the heating operation of the air conditioner, the amount of liquid refrigerant that can be held by the reversible direction receiver can be increased, and the lubricant contained in the liquid refrigerant can easily flow out from the reversible direction receiver to the outside. .
That is, by arranging the opening in one pipe in the vicinity of the upper end of the container, the liquid refrigerant begins to rise to the opening, and the liquid refrigerant flows out of the reversible receiver through the one pipe. In other words, the amount of liquid refrigerant held inside the container is increased. Furthermore, by arranging the communication hole in the vicinity of the lower end of the container, the lubricant that easily accumulates in the lower part of the container can easily flow into one of the pipes through the communication hole.

On the other hand, during the cooling operation of the air conditioner, it becomes easy to supply the liquid refrigerant to the throttle mechanism.
That is, in the container, the liquid refrigerant collects downward and the gas refrigerant easily collects upward. By arranging the opening of the other pipe for supplying the refrigerant to the throttle mechanism in the vicinity of the lower end of the container, the opening can be arranged inside the accumulated liquid refrigerant, and it becomes easy to supply the liquid refrigerant to the throttle mechanism. .

  An air conditioner of the present invention is provided with an outdoor unit having an outdoor heat exchanger, an indoor unit having an indoor heat exchanger, and the reversible direction receiver of the present invention, wherein the one pipe is the outdoor heat The exchanger and the refrigerant are connected so as to be able to flow, and the other pipe is connected via the throttle mechanism so that the indoor heat exchanger and the refrigerant can flow.

According to the present invention, the liquid refrigerant can be held in the reversible direction receiver even when the air conditioner is heated.
For example, in a multi-type air conditioner in which a plurality of indoor units are connected to one outdoor unit, the minimum number of indoor units connected to the outdoor unit can be reduced. In other words, installation variations in the multi-type air conditioner can be increased.

  According to the reversible direction receiver and the air conditioner of the present invention, one pipe is extended to the upper side of the other pipe, a communication hole is provided on the side surface of the one pipe, and the other pipe is used as a throttle mechanism in the air conditioner. By connecting, in a multi-type air conditioner, even if it reduces the number of indoor units, there exists an effect that the excessive raise of the refrigerant pressure at the time of heating operation can be suppressed.

It is a mimetic diagram explaining composition of an air harmony machine concerning one embodiment of the present invention. It is a front view explaining the structure of the receiver of FIG.

An air conditioner according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.
Drawing 1 is a mimetic diagram explaining composition of an air harmony machine concerning this embodiment.
The air conditioner 1 of this embodiment is what is called a multi-type air conditioner provided with four indoor units 4A, 4B, 4C, and 4D with respect to one outdoor unit 2, as shown in FIG. . In addition, the number of indoor units should just be plural, it may be more or less than the above-mentioned four units, and it does not specifically limit.

As shown in FIG. 1, the outdoor unit 2 is mainly provided with a compressor 21, a four-way valve 22, an outdoor heat exchanger 23, and expansion valves (throttle mechanisms) 24A, 24B, 24C, and 24D. ing.
Furthermore, liquid side operation valves 25A, 25B, 25C, 25D and gas side operation valves 26A, 26B, 26C, 26D are provided between the outdoor unit 2 and the indoor units 4A, 4B, 4C, 4D. ing.

The compressor 21 circulates the refrigerant between the one outdoor unit 2 and the four indoor units 4A, 4B, 4C, 4D, sucks and compresses the low-temperature and low-pressure refrigerant, and the high-temperature and high-pressure refrigerant. It is what. An accumulator 27 and a separate accumulator 28 are connected to the suction port of the compressor 21 so that the refrigerant can flow, and a muffler 29 is connected to the discharge port so that the refrigerant can flow.
The compressor 21 may be a known compressor such as a scroll compressor, and is not particularly limited.

The accumulator 27 and the separate accumulator 28 supply the gas refrigerant to the compressor 21 and temporarily store the liquid refrigerant so that the refrigerant is between one outdoor unit 2 and the four indoor units 4A, 4B, 4C, 4D. The flow rate is adjusted.
The accumulator 27 is disposed between the compressor 21 and the separate accumulator 28 and is connected to the suction port of the compressor 21 so as to be able to supply a gaseous refrigerant. The separate accumulator 28 is disposed between the accumulator 27 and the four-way valve 22, and is connected to the accumulator 27 so that a gaseous refrigerant can be supplied.
A suction pipe sensor 31 that measures the temperature of the refrigerant sucked into the compressor 21 is disposed in a pipe connecting the accumulator 27 and the separate accumulator 28.

The muffler 29 relaxes the pressure fluctuation of the refrigerant discharged from the compressor 21 and suppresses the generation of vibration and noise due to the pressure fluctuation.
The muffler 29 is disposed between the compressor 21 and the four-way valve 22 and is connected to the discharge port of the compressor 21 so that the refrigerant can flow. A discharge pipe sensor 32 that measures the temperature of the refrigerant discharged from the compressor 21 is disposed on the pipe connecting the muffler 29 and the compressor 21.

The four-way valve 22 controls the outflow destination of the refrigerant discharged from the compressor 21 according to the operating state of the air conditioner 1.
Specifically, during the cooling operation, the refrigerant discharged from the compressor 21 is guided to the outdoor heat exchanger 23, and the refrigerant flowing out from the indoor heat exchanger 41 is guided to the compressor 21. During the heating operation, the refrigerant discharged from the compressor 21 is guided to the indoor heat exchanger 41, and the refrigerant flowing out of the outdoor heat exchanger 23 is guided to the compressor 21.

The four-way valve 22 is connected so that the refrigerant can flow out toward the separate accumulator 28 and the refrigerant can flow in from the muffler 29. Furthermore, the refrigerant is connected to the outdoor heat exchanger 23 and the indoor heat exchangers 41 of the indoor units 4A, 4B, 4C, and 4D so that the refrigerant can flow in or out.
A known valve can be used as the four-way valve 22 and is not particularly limited.

The outdoor heat exchanger 23 performs heat exchange between the outdoor air and the refrigerant. Specifically, during the cooling operation, the heat of the refrigerant is dissipated to the outdoor air, and during the heating operation, the heat of the outdoor air is absorbed by the refrigerant. The outdoor heat exchanger 23 is disposed between the four-way valve 22 and a receiver (reversible direction receiver) 50, and is connected so as to allow the refrigerant to flow therethrough.
In the outdoor heat exchanger 23, an outdoor heat exchanger sensor 34 that measures the temperature of the outdoor heat exchanger 23 and an outdoor air temperature sensor 35 that measures the temperature of outdoor air are arranged.

FIG. 2 is a front view illustrating the configuration of the receiver of FIG.
The receiver 50 is disposed between the outdoor heat exchanger 23 and the expansion valves 24A, 24B, 24C, and 24D, and is connected so as to allow the refrigerant to flow therethrough. The receiver 50 supplies liquid refrigerant to the expansion valves 24A, 24B, 24C, and 24D during the cooling operation, and stores (holds) excess liquid refrigerant during the heating operation.
As shown in FIG. 2, the receiver 50 is provided with a container 51, a first pipe (one pipe) 52A, and a second pipe (the other pipe) 52B.

  The container 51 stores liquid refrigerant or gas refrigerant therein. In the present embodiment, the container 51 will be described by applying to an example in which the container 51 is formed in a cylindrical shape with both ends closed.

As shown in FIGS. 1 and 2, the first pipe 52 </ b> A is a pipe that connects the container 51 and the outdoor heat exchanger 23 so that the refrigerant can flow therethrough.
As shown in FIG. 2, the first pipe 52 </ b> A is inserted into the container 51 from the lower end of the container 51. Further, the first pipe 52A is arranged extending inside the container 51 toward the upper end of the container 51, and the opening 53A connected to the inside of the container 51 in the first pipe 52A is arranged near the upper end of the container 51.

  On the side surface of the first pipe 52 </ b> A, a communication hole 54 that connects the inside of the first pipe 52 </ b> A and the inside of the container 51 is provided. The communication hole 54 is a hole through which the lubricating oil (lubricant) of the compressor 21 stored in the container 51 flows into the first pipe 52A. The communication hole 54 is formed below the region of the first pipe 52 </ b> A disposed inside the container 51, in other words, near the lower end of the container 51. In the present embodiment, the communication hole 54 is further formed in the vicinity of the opening 53B of the second pipe 52B.

  The diameter of the communication hole 54 is determined based on a target value of the amount of liquid refrigerant held in the container 51 during the heating operation. That is, it is determined based on the flow rate of the liquid refrigerant flowing into the container 51 during the heating operation and the flow rate of the liquid refrigerant flowing into the communication hole 54.

As shown in FIGS. 1 and 2, the second pipe 52B is a pipe that connects the refrigerant between the container 51 and the expansion valves 24A, 24B, 24C, and 24D. In other words, the pipe connects the container 51 and the indoor heat exchanger 41 so that the refrigerant can flow therethrough.
As shown in FIG. 2, the second pipe 52 </ b> B is inserted into the container 51 from the lower end of the container 51. Furthermore, the opening 53 </ b> B connected to the inside of the container 51 in the second pipe 52 </ b> B is disposed in the vicinity of the lower end of the container 51.

  The expansion valves 24A, 24B, 24C, and 24D are for adiabatically expanding the refrigerant that passes therethrough, and reduce the temperature and pressure of the refrigerant. The expansion valves 24A, 24B, 24C, and 24D are arranged corresponding to the indoor units 4A, 4B, 4C, and 4D, in other words, are connected so that the refrigerant can flow therethrough. Specifically, the expansion valves 24A, 24B, 24C, and 24D are respectively arranged in four pipes that branch from one pipe extending from the receiver 50 in correspondence with the indoor units 4A, 4B, 4C, and 4D. .

  The liquid side operation valves 25A, 25B, 25C, and 25D are portions connected to pipes extending from the indoor units 4A, 4B, 4C, and 4D, and are disposed corresponding to the indoor units 4A, 4B, 4C, and 4D, respectively. It is an operated valve. Furthermore, the liquid side operation valves 25A, 25B, 25C, and 25D are arranged corresponding to the expansion valves 24A, 24B, 24C, and 24D, and a sound deadening capillary 36 and a strainer 37 are arranged therebetween.

  The gas side operation valves 26A, 26B, 26C, and 26D are portions connected to pipes extending from the indoor units 4A, 4B, 4C, and 4D, and are disposed corresponding to the indoor units 4A, 4B, 4C, and 4D, respectively. It is an operated valve. The gas side operation valves 26A, 26B, 26C, and 26D are connected to the four-way valve 22 through the manifold 38 so that the refrigerant can flow therethrough.

  As shown in FIG. 1, the indoor units 4A, 4B, 4C, and 4D are mainly provided with an indoor heat exchanger 41, a suction sensor 42, a central heat exchange sensor 43, and a cooling outlet heat exchange sensor 44. It has been.

The indoor heat exchanger 41 is disposed in each of the indoor units 4A, 4B, 4C, and 4D, and performs heat exchange between the indoor air and the refrigerant. Specifically, the heat of the room air is absorbed by the refrigerant during the cooling operation, and the heat of the refrigerant is radiated to the room air during the heating operation.
The indoor heat exchanger 41 of the indoor units 4A, 4B, 4C, and 4D allows refrigerant to flow through the liquid side operation valves 25A, 25B, 25C, and 25D and the gas side operation valves 26A, 26B, 26C, and 26D, respectively. It is connected.

  The indoor heat exchanger 41 includes a suction sensor 42 that measures the temperature of indoor air sucked into the indoor units 4A, 4B, 4C, and 4D, and a central heat exchange sensor that measures the temperature of the central portion of the indoor heat exchanger 41. 43 and a cooling outlet heat exchange sensor 44 that measures the end temperature of the indoor heat exchanger 41 that serves as a refrigerant outlet during cooling.

  Next, the cooling operation and the heating operation in the air conditioner 1 having the above configuration will be described.

When the cooling operation is performed, as shown in FIG. 1, the four-way valve 22 is switched, the discharge port of the compressor 21 and the outdoor heat exchanger 23 are connected, and the suction port of the compressor 21 and the indoor heat exchange are connected. The device 41 is connected.
The high-temperature and high-pressure refrigerant discharged from the compressor 21 flows into the outdoor heat exchanger 23 through the muffler 29 and the four-way valve 22. In the outdoor heat exchanger 23, the refrigerant releases heat to the outdoor air and condenses to become a liquid refrigerant. The high-pressure liquid refrigerant is led from the outdoor heat exchanger 23 to the expansion valves 24A, 24B, 24C, and 24D via the receiver 50.

  The high-pressure liquid refrigerant undergoes adiabatic expansion when passing through the expansion valves 24A, 24B, 24C, and 24D, and becomes a low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant flows into the indoor heat exchanger 41 of the indoor units 4A, 4B, 4C, and 4D through the silencer capillary 36, the strainer 37, and the liquid side operation valves 25A, 25B, 25C, and 25D. The refrigerant absorbs heat from indoor air in the indoor heat exchanger 41 and evaporates to become a gaseous refrigerant. On the other hand, the indoor air is deprived of heat and cooled.

  The gaseous refrigerant is sucked into the suction port of the compressor 21 through the gas side operation valves 26A, 26B, 26C, and 26D, the manifold 38, the four-way valve 22, the separate accumulator 28, and the accumulator 27. The sucked refrigerant is compressed by the compressor 21 and discharged from the discharge port as a high-temperature and high-pressure refrigerant. Thereafter, the cooling operation is continued by repeating the above-described process.

When the heating operation is performed, as shown in FIG. 1, the four-way valve 22 is switched, the discharge port of the compressor 21 and the indoor heat exchanger 41 are connected, and the suction port of the compressor 21 and the outdoor heat exchange are connected. The device 23 is connected.
The high-temperature and high-pressure refrigerant discharged from the compressor 21 flows into the indoor heat exchanger 41 through the muffler 29 and the four-way valve 22. In the indoor heat exchanger 41, the refrigerant releases heat to the indoor air and condenses to become a liquid refrigerant. On the other hand, indoor air absorbs heat and is heated. The high-pressure liquid refrigerant is guided from the indoor heat exchanger 41 to the expansion valves 24A, 24B, 24C, and 24D via the liquid side operation valves 25A, 25B, 25C, and 25D, the strainer 37, and the sound-eliminating capillary 36.

  The high-pressure liquid refrigerant undergoes adiabatic expansion when passing through the expansion valves 24A, 24B, 24C, and 24D, and becomes a low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant flows into the outdoor heat exchanger 23 via the receiver 50. The refrigerant absorbs heat from the outdoor air in the outdoor heat exchanger 23 and evaporates to become a gaseous refrigerant.

  The gaseous refrigerant is sucked into the suction port of the compressor 21 through the four-way valve 22, the separate accumulator 28 and the accumulator 27. The sucked refrigerant is compressed by the compressor 21 and discharged from the discharge port as a high-temperature and high-pressure refrigerant. Thereafter, the cooling operation is continued by repeating the above-described process.

Next, the refrigerant flow and storage in the receiver 50, which is a feature of the present embodiment, will be described.
First, the storage of the liquid refrigerant in the receiver 50 during the heating operation, in other words, the holding of the liquid refrigerant by the receiver 50 will be described.

During the heating operation of the air conditioner 1, the refrigerant in which the gas refrigerant and the liquid refrigerant decompressed by the expansion valves 24A, 24B, 24C, 24D are mixed flows into the receiver 50 through the second pipe 52B. The gaseous refrigerant flows into the pipe from the opening 53A formed at the upper end of the first pipe 52A and flows out from the receiver 50. Therefore, most of the liquid refrigerant is held inside the container. A part of the liquid refrigerant flows into the pipe together with the lubricating oil contained in the liquid refrigerant from the communication hole 54 formed on the side surface of the first pipe 52 </ b> A and flows out from the receiver 50.
Compared with the flow rate of the liquid refrigerant flowing into the container 51 from the second pipe 52B, the flow rate of the liquid refrigerant flowing through the communication hole 54 and out of the container 51 is small. Also, the liquid refrigerant is held in the receiver 50.

  Here, the opening 53A in the first pipe 52A is arranged in the vicinity of the upper end of the container 51, so that the liquid refrigerant begins to rise up to the opening 53A, and the liquid refrigerant goes out of the receiver 50 through the first pipe 52A. leak. In other words, the amount of liquid refrigerant held in the container 51 is increased. Furthermore, by arranging the communication hole 54 in the vicinity of the lower end of the container 51, the lubricating oil that tends to accumulate below the container 51 easily flows into one pipe through the communication hole 54.

During the cooling operation of the air conditioner 1, the flow direction of the refrigerant is reversed from that during the heating operation, and the liquid refrigerant condensed by the outdoor heat exchanger 23 flows into the receiver 50 through the first pipe 52A. The liquid refrigerant flows into the expansion valves 24A, 24B, 24C, and 24D through the second pipe 52B. However, since the flow rate of the liquid refrigerant that passes through the expansion valves 24A, 24B, 24C, and 24D is limited, the excess liquid refrigerant Accumulates in the receiver 50. Therefore, the liquid refrigerant is temporarily stored in the receiver 50 during the cooling operation.
Furthermore, as compared with the reversible direction receiver described in the prior art document, a partition plate is provided that divides an area where the first pipe 52A is arranged and an area where the second pipe 52B is arranged inside the container. Therefore, the flow resistance when the refrigerant passes through the receiver 50 is reduced.

  Here, in the container 51, the liquid refrigerant easily collects downward, and the gas refrigerant easily accumulates upward. By arranging the opening 53B of the second pipe 52B for supplying the refrigerant to the expansion valves 24A, 24B, 24C, 24D in the vicinity of the lower end of the container 51, the opening 53B can be arranged inside the accumulated liquid refrigerant, It becomes easy to supply the liquid refrigerant to the expansion valves 24A, 24B, 24C, and 24D.

  According to the above configuration, the liquid refrigerant can be held in the receiver 50 even during heating operation, and the number of indoor units 4A, 4B, 4C, 4D connected to the outdoor unit 2 can be reduced. In addition, it is possible to prevent the refrigerant pressure in the indoor heat exchanger 41 and the like from rising excessively. In other words, the minimum number of indoor units 4A, 4B, 4C, 4D in the air conditioner 1 can be reduced, the number of installation variations in the air conditioner 1 can be increased, and air that meets market needs in a wider range. The harmony machine 1 can be provided.

DESCRIPTION OF SYMBOLS 1 Air conditioner 2 Outdoor unit 4A, 4B, 4C, 4D Indoor unit 23 Outdoor heat exchanger 24A, 24B, 24C, 24D Expansion valve (throttle mechanism)
41 Indoor heat exchanger 50 Receiver (Reversible receiver)
51 container 52A first pipe (one pipe)
52B Second piping (the other piping)
53A opening 53B opening 54 communication hole

Claims (3)

A reversible direction receiver used in a heat pump type air conditioner capable of reversibly switching the flow direction of the refrigerant,
A container for storing the refrigerant therein;
One pipe extending from the bottom to the top of the container and having an opening at the upper end, and the air conditioner allows the refrigerant to flow into the container during cooling operation and allows the refrigerant to flow out from the container during heating operation; ,
The other pipe extending from the bottom to the top of the container and having an opening at the upper end thereof, the air conditioner causes the refrigerant to flow out of the container during cooling operation, and allows the refrigerant to flow into the container during heating operation; ,
Is provided,
The one pipe extends to a position higher than the other pipe, and a communication hole that connects the one pipe and the inside of the container is provided on a side surface of an area of the one pipe disposed in the container. ,
The other pipe is connected to a throttling mechanism that reduces the pressure of the refrigerant in the air conditioner. The opening and the communication hole in the other pipe are arranged near the lower end of the container,
The reversible direction receiver according to claim 1, wherein the opening in the one pipe is disposed in the vicinity of the upper end of the container. An outdoor unit having an outdoor heat exchanger;
An indoor unit having an indoor heat exchanger;
Reversible direction receiver according to claim 1 or 2,
Is provided,
The one pipe is connected so that the outdoor heat exchanger and the refrigerant can flow,
The other pipe is connected to the indoor heat exchanger and the refrigerant through the throttle mechanism so that the refrigerant can flow therethrough.

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