JPH10205905A - Air-conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a defrosting time by providing a control device to open a two-way valve such that during defrosting of hating operation, a delivery refrigerant from a compressor is guided to an outdoor heat-exchanger and caused to flow to a pressure reduction device and an indoor heat-exchanger, and a part of a refrigerant from the outdoor heat-exchanger is guided to a heat absorption heat-exchanger. SOLUTION: During defrosting, a gas refrigerant introduced from a compressor 2 to an outdoor heat-exchanger 9 is radiated and liquefied and is caused to flow to an opened two-way valve 16 side. A part of a liquid refrigerant branched to the opened two-way valve 16 side is guided to a bypass pipe 15 and is caused to flow in a capillary tube 15 and in which case, a pressure is reduced and introduced to a heat absorption heat-exchanger 20. In which case, a liquid refrigerant absorbs heat from a heat storage material 18, with which a heat storage tank 19 is filled, and vaporized and temperature is increased. Further, after gas and liquid are separated away from each other by a second suction cup 21, the refrigerant is returned to the cylinder of one of compressors and feeds heat to the compressors 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump type air conditioner equipped with a compressor having two cylinders, and more particularly to an air conditioner having an improved defrosting method during a heating operation.

[0002]

2. Description of the Related Art Conventionally, as an example of a defrosting method for a heat pump type air conditioner of this type, a high-temperature and high-pressure discharge refrigerant is guided to an outdoor heat exchanger by switching between a heat absorption side and a heat radiation side of a refrigeration cycle. There are a reverse method in which frost is applied, and a fully opened expansion valve in which the refrigerant from the indoor heat exchanger is guided to the outdoor heat exchanger without decompression and defrosted by fully opening the expansion valve.

[0003] In addition, there is a defrosting method in which a heat storage source is used as a heat absorbing source during defrosting, and all the heat required for defrosting is covered only by the heat storage source.

[0004]

However, in such a defrosting method using only the reverse defrosting method and the expansion valve fully opening defrosting method, the amount of heat used for defrosting is retained during the operation of the refrigeration cycle, especially the compressor. Since there is no choice but to use only the amount of heat, there is a problem that the defrosting ability gradually decreases as the amount of heat decreases.

In an air conditioner that uses a heat storage source as a heat absorbing source during defrosting, a large amount of heat is stored in consideration of operating efficiency because all the heat required for defrosting is covered only by the heat storage source. However, there is a problem that the heat storage tank is increased in size to keep the weight.

Accordingly, the present invention has been made in view of such circumstances, and an object of the present invention is to use heat storage heat absorption and outside air heat absorption together, so that the defrosting time is shorter than in the conventional method. An object of the present invention is to provide an air conditioner capable of achieving both reduction in size and weight of a heat storage tank.

[0007]

According to the first aspect of the present invention, there is provided an air conditioner in which a compressor having two cylinders, a four-way valve, an indoor heat exchanger, a pressure reducing device, and an outdoor heat exchanger are sequentially communicated to form a refrigeration cycle. In the air conditioner configured and provided with each suction pipe for guiding the refrigerant from the four-way valve to each cylinder, the air conditioner capable of heating and cooling communicates between the indoor heat exchanger and the pressure reducing device and one of the suction pipes. A bypass passage, a heat-absorbing heat exchanger disposed in a heat storage tank filled with a two-way valve and a heat storage material sequentially interposed in the bypass passage; The discharged refrigerant is guided to the outdoor heat exchanger, and flows into the decompression device and the indoor heat exchanger. The two-way valve is opened so that a part of the refrigerant from the outdoor heat exchanger is guided to the endothermic heat exchanger. And a control device.

According to the present invention, during the defrosting operation of the heating operation, the control device switches and controls the four-way valve, so that the circulation direction of the refrigerant circulating in the refrigeration cycle is reversed during the heating operation, so-called reverse defrosting operation. Is started.

For this purpose, the high-temperature and high-pressure gaseous refrigerant discharged from the compressor is introduced into the outdoor heat exchanger and radiates heat there, so that the outdoor heat exchanger is heated and defrosted.

While the heat is radiated by the outdoor heat exchanger, a part of the liquefied liquid refrigerant is guided to the two-way valve opened by the control device and the bypass, and is absorbed by the heat absorbing heat exchanger in the heat storage tank. Here, heat is absorbed from the heat storage material to evaporate and elevate the temperature, and is returned to the suction side of the compressor as a high-temperature gas refrigerant to form a heat storage heat absorption cycle for supplying heat to the compressor.

Therefore, according to the present invention, since the outside air heat absorption cycle of reverse defrosting and the heat storage heat absorption cycle are simultaneously used, a decrease in the heat retained in the compressor can be suppressed, and only the so-called conventional reverse defrosting method is used. The defrosting time can be shorter than in the case. Further, the size and weight of the heat storage tank can be reduced as compared with the conventional defrosting method using only the heat storage and heat absorption cycle.

The air conditioner according to the second aspect of the present invention constitutes a refrigeration cycle by sequentially communicating a compressor having two cylinders, a four-way valve, an indoor heat exchanger, a pressure reducing device, and an outdoor heat exchanger. In each of the air conditioners capable of cooling and heating, provided with each suction pipe for guiding the refrigerant from each cylinder to each cylinder, a bypass path communicating between the indoor heat exchanger and the pressure reducing device and one of the suction pipes, An endothermic heat exchanger arranged in a heat storage tank filled with a two-way valve and a heat storage material sequentially interposed in a bypass passage, and an electronic device whose opening degree as the decompression device can be varied during defrosting in a heating operation. The opening degree of the expansion valve is greatly opened to guide the refrigerant flowing out of the indoor heat exchanger to the outdoor heat exchanger with almost no pressure reduction, and at the same time, a part of the refrigerant from the indoor heat exchanger to the endothermic heat Open the above two-way valve to lead to the exchanger Characterized in that it has a control device and,.

According to the present invention, at the time of defrosting in the heating operation, the opening of the electronic expansion valve is greatly opened by the control device, so that the high-temperature and high-pressure gas refrigerant discharged from the compressor passes through the indoor heat exchanger. After that, most of them flow into the outdoor heat exchanger in a large amount without being depressurized by the electronic expansion valve, and further radiate heat there to remove frost from the outdoor heat exchanger. Because of this, it is possible to defrost while continuing heating,
The heating efficiency can be improved, and the defrosting time can be shortened.

At the time of this defrosting, the liquefied liquid refrigerant, which radiates heat in the indoor heat exchanger and is liquefied, is guided by the two-way valve opened by the control device and the bypass, and is introduced into the endothermic heat exchanger. Here, the heat is absorbed from the heat storage material, vaporized and heated, and then returned to the suction side of the compressor again to supply heat to the compressor. For this reason, a decrease in the heat retained by the compressor can be suppressed.

Therefore, according to the present invention, the outside air heat absorption cycle in which the outdoor heat exchanger is defrosted by the high-temperature and high-pressure gas refrigerant, and the heat storage heat absorption in which a part of the liquid refrigerant absorbs heat from the heat storage material to be vaporized and rises in temperature. Since the cycle and the cycle are used at the same time, it is possible to suppress a decrease in the heat retained by the compressor, and it is possible to shorten the defrosting time compared to the case where only the so-called expansion valve full-opening defrosting method alone is used. Further, the size and weight of the heat storage tank can be reduced as compared with the conventional defrosting method using only the heat storage and heat absorption cycle.

In the air conditioner according to a third aspect of the present invention, the control device operates the indoor fan provided in the indoor heat exchanger during the defrosting operation, and stops the outdoor fan provided in the outdoor heat exchanger. Characterized in that it comprises means for causing

According to this invention, in addition to the function and effect of the invention of claim 2, since the indoor fan is operated during the defrosting, the indoor air is radiated by the high-temperature and high-pressure gas refrigerant radiated by the indoor heat exchanger. Is heated and blown into the room, so that the heating operation can be continued.

Further, since the operation of the outdoor fan is stopped at the time of the defrosting, the heat radiation of the outdoor heat exchanger can be utilized exclusively for the defrosting without operating the outdoor fan as hot air to the outside air. Therefore, the defrosting efficiency can be improved.

In the air conditioner according to a fourth aspect of the present invention, the control device starts the defrosting operation after a predetermined time has elapsed from the start of the heating operation or from the end of the previous defrosting operation, and a predetermined time before the start of the defrosting operation. And a means for opening the two-way valve.

According to the present invention, in addition to the functions and effects of the first and second aspects of the present invention, the control device starts the defrosting operation after a predetermined time has elapsed from the start of the heating operation or from the end of the previous defrosting operation. During the heating operation for a predetermined time before the start of these defrosting operations, since the two-way valve of the bypass is opened in advance, a part of the liquid refrigerant from the indoor heat exchanger is guided by the two-way valve during valve opening, It flows into the heat absorption heat exchanger through the bypass passage, where it absorbs heat from the heat storage material and gasifies it, raises the temperature, returns to the suction side of the compressor, and supplies heat to the compressor. For this reason, since the decrease in the heat retained by the compressor can be suppressed before the start of defrosting, the heat retained by the compressor can be increased by a certain amount before the start of defrosting. It is possible to suppress a sharp decrease in retained heat. Therefore, the defrosting time can be further reduced.

An air conditioner according to a fifth aspect of the present invention is characterized in that the air conditioner further comprises a radiating heat exchanger disposed in the heat storage tank, for introducing refrigerant discharged from the compressor and storing heat in the heat storage material. I do.

According to this invention, in addition to the functions and effects of the first and second aspects of the present invention, a part of the high-temperature and high-pressure gaseous refrigerant discharged from the compressor during, for example, the heating operation is exchanged for heat radiation in the heat storage tank. Since heat is introduced into the vessel and heat is dissipated, heat can be stored in the heat storage material. Further, it is not necessary to separately provide a heating means for preheating the heat storage material and storing the heat.

[0023]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
This will be described with reference to FIG. In these figures, the same or corresponding parts are denoted by the same reference characters.

FIG. 1 is a refrigeration cycle diagram of an air conditioner according to a first embodiment of the present invention. An air conditioner 1 has two built-in cylinders 2a and 2b for individually compressing refrigerant. 2, an indoor heat exchanger 5 having a four-way valve 3, an indoor fan 4, an electronic expansion valve 6 as a decompression device, an outdoor heat exchanger 9 having an outdoor fan 8, and each of the cylinders 2a, 2b each suction pipe 1 on the suction side
The first suction cups 12 connected via 0 and 11 are connected in order by a refrigerant pipe 13 to form a closed loop for circulating the refrigerant.

The indoor heat exchanger 5 and the electronic expansion valve 6
Between the refrigerant pipe 13 and the one suction pipe 11
Is connected to the downstream side of the check valve 13 by a bypass pipe 15 forming a bypass passage.

In the middle of the bypass pipe 15, a two-way valve 16, a capillary tube 17, and a heat storage material 18 are filled from the upstream side to the downstream side in the flow direction of the refrigerant during the defrosting operation indicated by the solid line arrow in the figure. An endothermic heat exchanger 20 and a second suction cup 21 provided in a heat storage tank 19, which is a heat storage tank, are sequentially provided.

The one suction pipe 11 is provided with a check valve 14 for preventing the refrigerant from flowing backward from the bypass pipe 15 to the first suction cup 12.

The control device 22 is electrically connected to the four-way valve 3, the electronic expansion valve 6, and the two-way valve 16, respectively. While performing the normal heating operation by circulating the refrigerant, the cooling operation is performed by circulating the refrigerant in the opposite direction to the heating operation, and further, the defrosting operation during the heating is performed in the same cycle as the cooling operation in the solid arrow direction in the figure. Operation mode switching means for circulating the refrigerant through the cooling device.

The control device 22 starts the defrosting operation at the start of the heating operation or after a lapse of a predetermined time from the end of the previous defrosting operation during the heating operation.

Further, the control device 22 controls the electronic expansion valve 6.
It has a two-way valve control means for controlling the flow rate of the refrigerant by controlling the opening degree, and opening the two-way valve 16.

That is, the controller 22 controls each actuator according to the operation mode as shown in Table 1 below.

[0032]

[Table 1]

Therefore, when the heating operation mode is selected by a remote controller (not shown) or the like, the four-way valve 3 is turned on (energized) by the control device 22, the two-way valve 16 is closed, and the indoor fan 4 and the outdoor The fan 8 is operated.
For this reason, the refrigerant circulates in the refrigeration cycle in the direction of the dashed arrow in the figure. That is, the high-temperature and high-pressure gas refrigerant discharged from the compressor 2 is guided by the four-way valve 3 and introduced into the indoor heat exchanger 5, where it radiates heat and exchanges heat with the outside air, and the warm air is generated by the indoor fan 4. The air is blown into the room to heat it.

The condensed and liquefied liquid refrigerant radiating heat in the indoor heat exchanger 5 is decompressed by the electronic expansion valve 6 and the capillary tube parallel circuit 7 and then flows into the indoor heat exchanger 9. Then, it evaporates and absorbs heat from the outside air to gasify, and the heat exchange is promoted by the blowing of the outdoor fan 8, and further, the gas refrigerant is separated into gas and liquid by the first suction cup 12 before the gas refrigerant is removed from the compressor 2. Each cylinder 2
a, 2b.

During such a heating operation, the outdoor heat exchanger 9 is cooled by the latent heat of vaporization of the liquid refrigerant and the outside air, so that frost is formed on its outer surface.

Therefore, when the heating operation is continued for a predetermined time from the start of the heating operation and the end of the fully-open defrosting operation, or when the start of defrosting is detected by a sensor (not shown), the four-way valve 3 is switched off. , Two-way valve 1
The valve 6 is opened, and the operation of the indoor and outdoor fans 4, 8 is stopped.

Therefore, the two cylinders 2 of the compressor 2
The high-temperature and high-pressure gas refrigerant compressed by a and 2b circulates in the refrigeration cycle in the direction indicated by the solid line arrow in FIG. 1, and a reverse defrosting operation, which is a so-called outside air heat absorption cycle, is started.

To this end, the high-temperature and high-pressure gas refrigerant discharged from the compressor 2 is guided by the four-way valve 3 and introduced into the outdoor heat exchanger 9, where it radiates heat to form frost on the outdoor heat exchanger 9. To defrost. At this time, since the operation of the outdoor fan 8 is stopped, the heat radiation of the outdoor heat exchanger 9 can be used exclusively for defrosting.

The gas refrigerant introduced into the outdoor heat exchanger 9 radiates heat to liquefy, and the liquid refrigerant is decompressed by the electronic expansion valve 6 and the flow rate is controlled. The flow is divided into the valve 16 side and the indoor heat exchanger 5 side.

The liquid refrigerant flowing into the indoor heat exchanger 5 evaporates and evaporates in the indoor heat exchanger 5 and absorbs heat from the outside air.
Since the operation of the indoor fan 4 is stopped, no cool air is blown into the room.

The gaseous refrigerant vaporized in the indoor heat exchanger 5 is guided to the four-way valve 3 and separated into gas and liquid by the first suction cup 12, and then the two suction pipes 10, 1
1 again returns to the suction side of each of the cylinders 2a and 2b of the compressor 2, and absorbs the heat retained by the compressor 2.

On the other hand, a part of the liquid refrigerant diverted to the two-way valve 16 side while the valve is open is guided by the bypass pipe 15 and flows into the capillary tube 15, where the pressure is reduced and then the heat inside the endothermic heat exchanger 20. Will be introduced. Here, the liquid refrigerant absorbs heat from the heat storage material 18 filled in the heat storage tank 19, evaporates, and rises in temperature.
, And is returned again to the suction side of one of the cylinders of the compressor 2, for example, 2b, to supply heat to the compressor 2.

Accordingly, it is possible to suppress a rapid decrease in the heat retained in the compressor 2 due to defrosting, and to absorb a part of the liquid refrigerant from the heat storage material 19, so that defrosting can be performed even when the outside air temperature is low. Can be.

According to the defrosting operation, a so-called reverse defrosting cycle, which is an external air heat absorption cycle, and a heat storage heat absorption cycle, in which a part of the liquid refrigerant absorbs heat from the heat storage material 18 to be vaporized and the temperature rises, are simultaneously performed. Since it is used, the defrost can be completed earlier than in the case where only the conventional reverse defrost cycle is used. Further, the heat storage tank 19 can be reduced in size and weight as compared with the conventional example in which defrost is performed only by the heat storage and heat absorption cycle.

Further, since a part of the liquid refrigerant absorbs heat from the heat storage material 18 and is vaporized and returned to the suction side of the compressor 2, liquid back can be prevented or reduced.

The following Table 2 shows that when the continuation of the heating operation is measured by a timer (not shown), when the reverse defrosting operation is started, the two-way valve 16 is set in advance from a predetermined time before the start of the defrosting. Control device 22 when valve is kept open
An example of a control example according to the above will be described.

[0047]

[Table 2]

According to this control method, the two-way valve 16 is opened in advance from a predetermined time before the start of defrosting, so that the two-way valve 16 is opened so that the heat absorbing heat exchanger 2 of the heat storage tank 19 is opened.
By performing the heat absorption from the heat storage material 18 to the refrigerant introduced into the cylinder 0 for a predetermined time in advance, the heat storage can be supplied to the compressor 2 and the heat retained in the compressor 2 can be increased by a certain amount before the start of defrosting. . For this reason, a sudden decrease in the heat retained by the compressor 2 due to the defrost can be suppressed, so that the defrost time can be further reduced.

FIG. 2 is a refrigeration cycle diagram of an air conditioner 1A according to a second embodiment of the present invention.
FIG. 1A shows a configuration of the air conditioner 1 shown in FIG.
And the control device 22 is replaced with a control device 22A.

That is, the heat radiation bypass passage 23 is connected to the compressor 2
A first on-off valve 24 comprising an electromagnetic valve interposed in the refrigerant pipe 13 connecting the discharge side of the four-way valve 3 and the input side of the four-way valve 3;
A heat radiation bypass pipe 25 connected before and after the first on-off valve 24, a heat radiation heat exchanger 26 interposed in the heat radiation bypass pipe 25 and disposed in the heat storage tank 19; A second opening / closing valve 27 composed of a solenoid valve is provided on the upstream side of the exchanger 26 in the middle of the radiation bypass pipe 25. The first and second on-off valves 24 and 27 include a control device 2
The two-way valve 3, the electronic expansion valve 6, and the two-way valve 16 are electrically connected to the control device 22A.

The controller 22A controls the heat storage control means for controlling the opening and closing of the first and second on-off valves 24 and 27 in order to store the heat of the refrigerant in the heat storage material 18 of the heat storage tank 19 in advance. The feature is that it is added to the device 22. That is, the heat storage control means closes the first opening / closing valve 24 and opens the second opening / closing valve 27 to transfer the high-temperature and high-pressure gas refrigerant discharged from the compressor 2 through the heat-dissipating bypass pipe 25 to the heat-dissipating heat exchanger 26. Then, by releasing the heat here, heat can be stored in the heat storage material 18 in the heat storage tank 19. Therefore, it is not necessary to separately provide a heating means such as an electric heater for storing heat in the heat storage material 18, and accordingly, the entire air conditioner 1 can be reduced in size and weight.

When such heat storage is completed, the controller 22A closes the second on-off valve 27 and opens the first on-off valve 24 to prepare for heating or defrosting operation.

FIG. 3 is a refrigeration cycle diagram of an air conditioner 1B according to a third embodiment of the present invention.
Is characterized in that continuous heating defrosting of a so-called expansion valve fully open system is performed instead of the reverse defrosting. In the continuous heating defrosting, the opening degree of the electronic expansion valve 6 of the air conditioner 1 shown in FIG. 3 is substantially fully opened at the time of defrosting by the control device 22B, and the four-way valve 3 is kept in the ON state to compress. The high-temperature and high-pressure gas refrigerant from the unit 2 passes through the indoor heat exchanger 5 and is hardly depressurized at the electronic expansion valve 6 by the outdoor heat exchanger 9.
In this method, a large amount of water is introduced into the furnace and heat is released here to remove defrost.

The following Table 3 shows the control device 2 for this defrosting method.
An example of control by 2B is shown.

[0055]

[Table 3]

Therefore, according to the continuous heating defrosting method, the circulation direction of the refrigerant at the time of defrosting is the same as that at the time of the heating operation, and the indoor fan 4 is operated. Can be. For this reason, heating efficiency can be improved.

At the time of defrosting, a part of the refrigerant guided into the heat absorption heat exchanger 20 of the heat storage tank 19 by the two-way valve 16 that is being opened absorbs heat from the heat storage material 18 and is vaporized and rises. After being heated and further separated into gas and liquid by the second suction cup 21, the gas is returned to one cylinder 2b in the compressor 2 through one suction pipe 11. Therefore, the refrigerant gas that has absorbed heat from the heat storage material 18 and the refrigerant gas that has absorbed heat from the outside air are not mixed and mixed before the compressor 2, so that the heat storage can be reliably supplied to the compressor 2.

Therefore, it is possible to suppress a sudden decrease in the heat possessed by the compressor 2 due to the defrosting, and the high-temperature refrigerant having absorbed the heat possessed by the compressor absorbs the outdoor heat exchanger 9.
The defrosting time for defrosting the frost formation can be reduced.

Table 4 below shows that in the air conditioner 1B,
When the continuation of the heating operation is measured by a timer (not shown), when the continuous heating defrosting operation is started, the two-way valve 16 is opened in advance from a predetermined time before the start of the defrosting. An example of a control example by the control device 22B is shown.

[0060]

[Table 4]

According to this control method, the two-way valve 16 is opened in advance from a predetermined time before the start of defrosting. Therefore, by opening the two-way valve 16, the endothermic heat exchanger 2 of the heat storage tank 19 is opened.
By preliminarily absorbing heat from the heat storage material 18 to the refrigerant introduced to 0 for a predetermined time, heat storage can be supplied to the compressor 2 and the heat retained by the compressor 2 can be increased by a certain amount before defrosting starts. For this reason, a sudden decrease in the heat retained by the compressor 2 due to the defrost can be suppressed, so that the defrost time can be further reduced.

[0062]

As described above, according to the present invention, since the outside air heat absorption cycle of reverse defrosting and the heat storage heat absorption cycle are simultaneously used, the defrosting time is shortened as compared with the conventional reverse defrosting method alone. can do. Further, the size and weight of the heat storage tank can be reduced as compared with the conventional defrosting method using only the heat storage and heat absorption cycle.

Further, according to the present invention, the continuous heating and defrosting of the expansion valve fully open system and the heat storage and heat absorption cycle are simultaneously used, so that the heating is continued while the so-called conventional expansion valve full open system alone is used. Defrosting time can be shortened. Further, the size and weight of the heat storage tank can be reduced as compared with the conventional defrosting method using only the heat storage and heat absorption cycle.

[Brief description of the drawings]

FIG. 1 is a refrigeration cycle diagram of an air conditioner according to a first embodiment of the present invention.

FIG. 2 is a refrigeration cycle diagram of an air conditioner according to a second embodiment of the present invention.

FIG. 3 is a refrigeration cycle diagram of an air conditioner according to a third embodiment of the present invention.

[Explanation of symbols]

 1, 1A, 1B Air conditioner 2 Compressor 2a, 2b Cylinder 3 Four-way valve 4 Indoor fan 5 Indoor heat exchanger 6 Electronic expansion valve 8 Outdoor fan 9 Outdoor heat exchanger 10, 11 Suction pipe 13 Refrigerant pipe 15 Bypass pipe 16 Two-way valve 18 Heat storage material 19 Heat storage tank 20 Endothermic heat exchanger 22, 22A, 22B Control device

Claims (5)

[Claims] A compressor having two cylinders, a four-way valve,
An indoor heat exchanger, a decompression device, and an outdoor heat exchanger are sequentially communicated to constitute a refrigeration cycle, and each of the suction pipes for guiding the refrigerant from the four-way valve to each cylinder is provided. A bypass path for communicating between the indoor heat exchanger and the pressure reducing device and one of the suction pipes, and a two-way valve sequentially disposed in the bypass path and a heat storage tank filled with a heat storage material; During the defrosting of the heating operation, the refrigerant discharged from the compressor is guided to the outdoor heat exchanger and flows to the decompression device and the indoor heat exchanger. A controller that opens the two-way valve so as to guide a part of the refrigerant to the endothermic heat exchanger. 2. A compressor having two cylinders, a four-way valve,
An indoor heat exchanger, a decompression device, and an outdoor heat exchanger are sequentially communicated to form a refrigeration cycle, and each of the suction pipes for guiding the refrigerant from the four-way valve to each cylinder is provided. A bypass path communicating between the indoor heat exchanger and the pressure reducing device and one of the suction pipes, a two-way valve sequentially disposed in the bypass path, and a heat storage tank filled with a heat storage material; The heat-absorbing heat exchanger and the decompression during the heating operation, the opening of the electronic expansion valve, the opening of which is variable, which is the depressurizing device, is greatly opened, and the refrigerant exiting the indoor heat exchanger is hardly depressurized. A control device that opens the two-way valve so as to guide the refrigerant from the indoor heat exchanger to the endothermic heat exchanger while guiding the refrigerant to the outdoor heat exchanger. Harmony machine. 3. The control device includes means for operating the indoor fan provided in the indoor heat exchanger and stopping the outdoor fan provided in the outdoor heat exchanger during the defrosting operation. The air conditioner according to claim 2, characterized in that: The control device starts the defrosting operation after a lapse of a predetermined time from the start of the heating operation or the end of the previous defrosting, and the two-way valve of the bypass passage before the predetermined time before the start of the defrosting operation. 3. The air conditioner according to claim 1, further comprising means for opening the air conditioner. 5. The air according to claim 1, further comprising a radiating heat exchanger disposed in the heat storage tank, for introducing refrigerant discharged from the compressor and storing heat in the heat storage material. Harmony machine.