JPH07107470B2 - Heat pump air conditioner - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heat pump type air conditioner utilizing heat storage.

2. Description of the Related Art Conventionally, as an example of using heat storage in a refrigeration cycle, heat of a compressor discharge gas is stored in a heat storage heat exchanger during a refrigerating operation in a refrigerator, and the defrosting time is shortened during a defrosting operation. (For example, Japanese Utility Model Laid-Open No. 58-10937).

However, in the above conventional heat pump type air conditioner, although it is possible to shorten the defrosting time, since the refrigerant does not flow to the indoor heat exchanger during the defrosting operation, heating is performed. I couldn't do it, and it was not comfortable.

Further, the heat stored in the heat accumulator cannot be used when the heating capacity is insufficient such as when the heating operation starts.

In view of the above problems, the present invention stores heat in a heat storage tank filled with a heat storage material without lowering heating capacity during heating operation, and uses this heat during defrosting operation to remove defrost while maintaining high heating capacity. The purpose is to improve the comfort while exhibiting a high heating capacity without being influenced by the outside air temperature by using it at the start of heating operation.

Means for Solving the Problems In order to solve the above problems, in a heat pump type air conditioner of the present invention, first, a compressor, an outdoor heat exchanger, a pressure reducer, and an indoor heat exchanger are connected in an annular shape by pipes in order. A main bypass circuit, and a first bypass circuit having a heat storage heat exchanger that bypasses a part of the pipe from the discharge side of the compressor, which is the high pressure side during operation, to the pressure reducer, and the pressure reducer. A second bypass circuit that bypasses and has an auxiliary pressure reducer and the heat storage heat exchanger, a third bypass circuit that bypasses the outdoor heat exchanger, the first bypass circuit is opened during heat storage heating, and the second The bypass circuit and the third bypass circuit are closed, the first bypass circuit is closed during defrosting, and the second bypass circuit and the third bypass circuit are opened to flow through the outdoor heat exchanger. A flow path control means for flowing a part of the refrigerant to the third bypass circuit is provided.

Further, in another heat pump type air conditioner of the present invention, a compressor, an outdoor heat exchanger, a pressure reducer, and an indoor heat exchanger are annularly connected in order by a pipe to form a main refrigerant circuit, and a high pressure medium is used during operation. A first bypass circuit having a heat storage heat exchanger that bypasses a part of the pipe from the discharge side of the compressor to the pressure reducer, and an auxiliary pressure reducer and the heat storage heat exchanger that bypass the pressure reducer. A second bypass circuit that has, a third bypass circuit that bypasses the outdoor heat exchanger, a first bypass circuit that is opened during heat storage heating, and a second bypass circuit and a third bypass circuit that are closed to remove When the first bypass circuit is closed at the time of frost and the second bypass circuit and the third bypass circuit are opened, a part of the refrigerant flowing through the outdoor heat exchanger is caused to flow to the third bypass circuit, and the operation of utilizing heat storage is started. The one in which all of the refrigerant flowing through the outdoor side heat exchanger provided with a flow path control means for flowing the third bypass circuit and the second bypass circuit and the third bypass circuit is opened.

Further, the control method of the heat pump type air conditioner of the present invention,
The compressor is a variable capacity compressor, and the compressor is operated at high capacity during heat storage heating.

Further, another heat pump type air conditioner of the present invention is provided with a heat storage tank for storing the heat generated in the heat storage heat exchanger, and a heat storage amount detecting means for detecting the heat storage amount of the heat storage tank, and the flow path control means is A structure for switching the refrigerant flow paths based on the signal from the heat storage amount detecting means is provided there.

Further, in another heat pump type air conditioner of the present invention, the heat storage amount detecting means is further composed of two temperature detecting elements arranged in respective pipes connected to the inlet side and the outlet side of the heat storage heat exchanger. It is a thing.

Further, in another heat pump type air conditioner of the present invention, a compressor, an outdoor heat exchanger, a pressure reducer, and an indoor heat exchanger are annularly connected in order by a pipe to form a main refrigerant circuit, and a high pressure medium is used during operation. A first bypass circuit having a heat storage heat exchanger that bypasses a part of the pipe from the discharge side of the compressor to the pressure reducer, and an auxiliary pressure reducer and the heat storage heat exchanger that bypass the pressure reducer. A second bypass circuit, a third bypass circuit that bypasses the outdoor heat exchanger, and a flow path control unit that controls the opening and closing of each of the bypass circuits. A first pipe having one end connected to a pipe from the discharge side to the pressure reducer, and a second pipe having one end connected to the other end of the first pipe and the other end connected to a refrigerant inflow end of the heat storage heat exchanger And at the refrigerant outflow end of the heat storage heat exchanger A third pipe having an end connected thereto, a fourth pipe having one end connected to the other end of the third pipe, one end connected to the other end of the fourth pipe, and the other end downstream of one end of the first pipe The second bypass circuit has one end connected to the pipe from the indoor heat exchanger to the pressure reducer, and the other end connected to the fifth pipe connected to the pressure reducer on the side. A sixth pipe that is connected to the other end of one pipe and that has the auxiliary decompressor, the second pipe, the third pipe, and one end of the third pipe, and the other end thereof is decompressed. No. 7 connected to the pipe from the heat exchanger to the outdoor heat exchanger
It is composed of piping.

Further, another heat pump type air conditioner of the present invention further comprises a third bypass circuit including a sixth pipe, a second pipe, a third pipe, a seventh pipe, a fourth pipe and the fourth pipe. One end is connected to the other end, and the other end is connected to the suction side pipe of the compressor from the outdoor heat exchanger and an eighth pipe is configured.

Further, another heat pump type air conditioner of the present invention is a four-way valve for connecting the discharge side pipe and the suction side pipe of the compressor to switch the direction of the refrigerant flowing through the indoor heat exchanger, the pressure reducer and the outdoor heat exchanger. Is provided and both ends of the first bypass circuit are connected to a pipe from the discharge side of the compressor to the four-way valve.

Effect With the above-described means, the present invention makes it possible to utilize the heat accumulated during the heating operation during the defrosting operation, and defrost the outdoor heat exchanger while continuing the heating operation.

Further, by bypassing a part of the refrigerant from the outdoor heat exchanger during the defrosting operation, the pressure loss of the refrigerant in the outdoor heat exchanger can be reduced and the defrosting performance can be improved.

Further, by using the heat storage utilization start-up operation, the second bypass circuit and the third bypass circuit are opened so that all the refrigerant flowing through the outdoor heat exchanger is allowed to flow to the third bypass circuit, so that the heat stored at the start of the heating operation is used. It is possible to accelerate the start of heating operation.

Further, by operating the compressor with high capacity during heat storage heating, heat can be stored without lowering the heating capacity.

Further, by providing a heat storage amount detecting means and switching the refrigerant flow path based on this signal, optimum operation can be performed.

Further, by providing the heat storage amount detecting means at two places, the inlet side and the outlet side of the heat storage heat exchanger, the state of the refrigerant can be surely detected, and more optimal operation can be performed.

Further, by sharing a part of the pipes of the first bypass circuit and the second bypass circuit, it is possible to reduce the refrigerant flow resistance and reduce the amount of accumulated refrigerant.

Further, by sharing a part of the pipe of the third bypass circuit with the pipes of the second bypass circuit and the third bypass circuit, the above-described action is increased.

Further, by providing the four-way valve in the refrigeration cycle and providing the connection end of the first bypass circuit between the compressor and the four-way valve, the structure of the flow path control means can be simplified.

Embodiment Hereinafter, the present invention will be described with reference to FIG.
Description will be given with reference to FIG.

FIG. 1 is a refrigeration cycle diagram of a heat pump type air conditioner in one embodiment of the present invention, and FIG. 2 is a diagram showing operating states of valves for controlling the flow of refrigerant during each operation of the heat pump type air conditioner. Is.

As shown in FIG. 1, the main refrigerant circuit has a variable frequency compressor 1 capable of controlling the capacity, an indoor heat exchanger 3, an electric expansion valve 4, and an outdoor heat exchanger 5, which are connected by a pipe in an annular shape. Then configured. Reference numeral 2 is a four-way valve that connects the discharge side pipe and the suction side pipe of the compressor 1 and switches the direction of the refrigerant flowing through the indoor heat exchanger 3, the electric expansion valve 4, and the outdoor heat exchanger 5.

In the figure, a to j are symbols attached to the branch portions of the pipelines and are used to explain the flow of the refrigerant. Further, 10 to 15 are two-way valves that control the flow of the refrigerant.

Here, the pipeline composed of the first pipe ▲ ▼, the second pipe ▲ ▼, the third pipe ▲ ▼, the fourth pipe ▲ ▼, and the fifth pipe ▲ ▼ is a first pipe that bypasses the refrigerant discharged from the compressor 1. Bypass circuit ▲ ▼, 6th piping ▲ ▼,
2nd piping ▲ ▼, 3rd piping ▲ ▼, 7th piping ▲
The pipeline consisting of ▼ is a second bypass circuit ▲ ▼ that bypasses the electric expansion valve 4. Also, the first bypass circuit ▲
A heat storage tank is provided in the middle of the second pipe ▲ ▼ and the third pipe ▲ ▼, which are common pipes between the ▼ and the second bypass circuit ▲ ▼.
A heat storage heat exchanger 18 that exchanges heat with the heat storage material 17 filled in the inside 16 is provided. An auxiliary expansion device 19 is provided in the middle of the sixth pipe {circle around (2)} which constitutes the second bypass circuit {circle over ()}. Also, the sixth pipe ▲ ▼, the second pipe ▲
▼, third piping ▲ ▼, fourth piping ▲ ▼, and eighth piping ▲ ▼. Further, 20 and 21 are temperature detecting elements such as thermistors arranged in the pipe lines before and after the heat storage tank 16, and 22 is a temperature difference between the two temperatures detected by the temperature detecting elements 20 and 21 being a predetermined value. A flow path control circuit for issuing a refrigerant flow path switching signal, 23 is a flow for switching the refrigerant flow path by opening / closing the two-way valves 10 to 15, switching the four-way valve 2 or the like according to the signal issued by the flow path control circuit 22. It is a road switching relay.

In FIG. 2, the open circles indicate the valve open, and the crosses indicate the closed state. Further, the electric expansion valve 4a is specified by detecting the degree of superheat of the refrigerant sucked into the compressor 1 and the like.
It shows that the valve opening control is performed.

In this heat pump type air conditioner, each operation mode shown in FIG. 2 will be described. First, in the cooling mode, only the two-way valve 10 is open, and the refrigerant discharged from the compressor 1 is the four-way valve 2, the chamber. The outer heat exchanger 5, the electric expansion valve 4, the indoor heat exchanger 3, and the four-way valve 2 flow in this order and are sucked into the compressor 1.

In heating mode, when not storing heat, two-way valve
The state of 10 to 15 is the same as in the cooling mode, and only the four-way valve 2 is switched to the heating cycle side. Therefore, the refrigerant discharged from the compressor 1 is the four-way valve 2, the indoor heat exchanger 3, the electric expansion valve.
4, the outdoor heat exchanger 5, and the four-way valve 2 flow in this order and are sucked into the compressor 1. At this time, heat is not stored in the heat storage tank 16.

In the heating mode, when heat is stored, the two-way valve 10 is closed, the two-way valves 11 and 12 are opened, the frequency of the compressor 1 is increased, and high-performance operation is performed.

Therefore, the refrigerant discharged from the compressor 1 is the first bypass circuit ▲ ▼, the four-way valve 2, the indoor heat exchanger 3, the electric expansion valve.
4, the outdoor heat exchanger 5, and the four-way valve 2 flow in this order and are sucked into the compressor 1. At this time, part of the heat of the high-temperature, high-pressure refrigerant discharged from the compressor 1 is stored in the heat storage tank 16 by the heat storage heat exchanger 18, and the remaining heat is used for heating in the indoor heat exchanger 3. . At this time, it is possible to prevent the heating capacity from decreasing by operating the compressor 1 with high capacity.

Next, if the operation is stopped while the heat storage tank 16 is sufficiently storing heat, this heat can be used at the next heating start-up. In the rising mode utilizing heat storage, the two-way valves 10, 13, 15 are open and the others are closed. The electric expansion valve 4 is fully closed. At this time, the refrigerant discharged from the compressor 1 flows through the four-way valve 2, the indoor heat exchanger 3, the second bypass circuit {circle around (3)}, and the third bypass circuit {circle around (3)}, and is sucked into the compressor 1. Therefore, the high-temperature and high-pressure refrigerant discharged from the compressor 1 is used for heating in the indoor heat exchanger 3, and is decompressed by the auxiliary expansion device 19 to become low-temperature and low-pressure.
The heat stored in the heat storage tank 16 is absorbed by the heat storage heat exchanger 18. Then, the temperature detection elements 21, 20 detect the temperature of the refrigerant before and after flowing through the heat storage heat exchanger 18, and when the temperature difference becomes a predetermined value or less, the flow path control circuit 22 issues a signal, whereby the flow path switching relay 23. Two-way valve to activate the heating mode
Control 10-15. At the inlet of the heat storage heat exchanger 18, the refrigerant is 2
In the phase state, when the heat storage amount is sufficient, the outlet is overheated, so the temperature difference between the refrigerant at the inlet and the outlet is large,
As the heat storage amount decreases, this temperature difference gradually decreases and the heating capacity also decreases. Therefore, by performing the above control, it is possible to switch to the heating mode before the stored heat is used up and the heating capacity is significantly reduced.

Further, when the heat storage tank 16 is sufficiently stored with heat in the heating mode, the heat can be stored during defrosting. In the defrosting mode, the two-way valves 10, 13, 14, 15 are open and the others are closed. The electric expansion valve 4 is fully closed.
At this time, the refrigerant discharged from the compressor 1 flows through the four-way valve 2, the indoor heat exchanger 3, the second bypass circuit ▲ ▼, and a part of the refrigerant passes through the seventh pipe ▲ ▼ for outdoor heat exchange. The refrigerant flows to the container 5, the four-way valve 2 and the compressor 1, and the remaining refrigerant flows to the third bypass circuit {circle around ()} and is sucked into the compressor 1. Then, the temperature detection elements 21 and 20 detect the temperature of the refrigerant before and after flowing through the heat storage heat exchanger 18, and when the temperature difference becomes a predetermined value or less, the flow path control circuit 22 issues a signal, whereby the flow path switching relay is generated.
The two-way valves 10 to 15 and the four-way valve 2 are controlled so that 23 operates to enter the cooling mode. By performing this control, the heat storage tank 16
When the heat stored in the outdoor heat exchanger 5 is not sufficient or the amount of frost on the outdoor heat exchanger 5 is large and the heat stored before the completion of defrosting is used up, so-called reverse cycle defrosting is performed to remove the heat. The frost can be completed.

In this refrigeration cycle, in the rising mode of heat storage utilization, the outdoor heat exchanger 5 does not absorb heat from the outside air,
Since the heat stored in the heat storage tank 16 is absorbed by the heat storage heat exchanger 18, stable heat absorption is possible without being affected by the outside air temperature. Further, by using a latent heat storage material having a high melting point (for example, sodium acetate trihydrate; melting point 58 ° C.) as the heat storage material 17 and exchanging heat with the low temperature refrigerant, a larger heat exchange amount than during normal heating operation is obtained. be able to. Therefore, by utilizing the heat storage, a large heating capacity can be obtained even at the start-up at low outside air temperature.

FIG. 3 is a diagram showing the refrigeration cycle in the defrosting mode using heat storage on the Mollier diagram. As shown in the figure, the refrigerant used for heating absorbs heat from the heat storage tank 16 in the heat storage heat exchanger 18, and a part of the refrigerant flows to the outdoor heat exchanger 5 via the seventh pipe ▲ ▼. It flows and is used for defrosting, and the remaining refrigerant bypasses the outdoor heat exchanger 5 and the third bypass circuit ▲
Flows through ▼, then merges and is sucked into the compressor 1. Therefore, it is possible to defrost while continuing heating, and by flowing a part of the refrigerant through the third bypass circuit (1), the enthalpy of the refrigerant immediately before being sucked into the compressor 1 can be increased, and the compressor can be increased. The reliability of 1 can be secured.

As described above, by flowing a part of the refrigerant to the third bypass circuit {circle around (5)}, it is possible to reduce the pressure loss of the refrigerant in the outdoor heat exchanger 5, and thus to improve the defrosting performance.

The reason for this will be explained using an equation. First, in the outdoor heat exchanger 5, the heat quantity Q given to the frost by the refrigerant is Q = K · A _o ·
It is represented by ΔT (K ... heat transfer rate, A _o ... heat transfer area outside pipe (refrigerant side), ΔT ... average temperature difference between refrigerant and frost). here, Is (alpha _{o ...} abluminal heat transfer coefficient, alpha _{i ...} tube side heat transfer coefficient, r _m ... thermal resistance, A _i ... tube-side heat transfer area). The refrigerant flowing into the outdoor heat exchanger 5 is actually superheated gas, but here it is considered that all the refrigerant flowing through the outdoor heat exchanger 5 is in a two-phase state. Therefore, when the refrigerant pressure at the inlet of the outdoor heat exchanger 5 is P ₁ and the refrigerant pressure at the outlet is P ₂ , the respective saturation temperatures T ₁ and T ₂ are the refrigerant temperatures. Therefore Further, P ₂ = P ₁ −ΔP (ΔP ... Pressure loss of refrigerant in the outdoor heat exchanger 5).

Here, it is known that ΔP∝G _r ^A and α _i ∝G _r ^B (G _r ... Circulation amount of refrigerant flowing in the outdoor heat exchanger 5,
A, B ... constants).

A part of the above equation is used as an experimental result related to the present invention.
Approximate calculation is performed when the refrigerant is not passed through the bypass circuit ▲ ▼ and when 50% of the total circulation amount is applied.

First, without bypass, substitute α _o = 200 kcal / m ² h ℃, r _m = 0, α _i = 1400 kcal / m ² h ℃, A _o = 12 m ² , A _i = 0.85 m ² and substitute K = 63.6kcal / m ² h ℃ is obtained.
From P ₁ = 6.0kg / cm ² abs, P ₂ = 5.1kg / cm ² abs, from T ₁ = 5.24 ℃, T ₂ = 0.74 ℃, T _f ≈0 ℃ (maintain 0 ℃ during defrosting) , ΔT = 2.7 ° C.

Therefore, Q = 2060 kcal / h. When the amount of frost is 1.5 kg, the amount of heat F _Q required to turn -10 ° C frost into 0 ° C water is
Since F _Q = 127.5 kcal, the defrosting time T _d is Becomes

On the other hand, when bypassing is performed, if A = 1.75 and B = 0.5, then α _i = 990 and K = 49.6. Also, ΔP
= 0.27, and if P ₁ is the same as when bypass is not used, then T ₁ = 5.24, T ₂ = 3.77, and ΔT = 4.51.
Therefore, Q = 2684 and T _d = 2.85 minutes, and the defrosting time can be shortened by almost 1 minute as compared with the case without bypass.

Here, FIG. 4 is a diagram showing a plan for calculating the relationship between the bypass flow rate and the defrosting time. When the bypass amount exceeds 80%, the defrosting time becomes longer than when the bypass is not used. Therefore, ensure that the bypass amount is optimal (about 30-60% in the figure). Third bypass circuit ▲ ▼
An auxiliary diaphragm may be provided on the top.

In this embodiment, the two-way valve is used for switching the refrigerant flow path, but the invention is not limited to this, and other means such as a three-way valve may be used. Although the expansion device has been described using the electric expansion valve 4, other means such as a combination of a capillary and a two-way valve may be used.

Further, although the second bypass circuit {circle over (2)} bypasses the electric expansion valve 4, it may bypass the conduit between the electric expansion valve 4 and the outdoor heat exchanger 5.

Further, in this embodiment, the third bypass circuit ▲ ▼
Is the first bypass circuit ▲ ▼ and the second bypass circuit ▲
Although a part of the pipeline is shared with ▼, the pipeline is not limited to this and may be provided at another position as long as the pipeline bypasses the outdoor heat exchanger 5.

Further, although the first bypass circuit (2) bypasses the pipe line between the compressor 1 and the four-way valve 2, it may also bypass other positions on the high pressure side during the heating operation.

Further, in the present embodiment, the refrigerant flow path is switched by the heat storage amount detecting means in the defrosting mode and the rising mode, but the present invention is not limited to this, and the heat storage amount detecting means is used when heat is stored in the heating mode. Can be used for other control such as detecting completion of heat storage in the heat storage tank and switching the refrigerant flow path to only heating operation. Also as a heat storage amount detection means 1
Other means such as disposing one or a plurality of temperature detecting elements in the heat storage tank may be used.

Further, the capacity varying means of the compressor is not limited to the variable frequency type.

Effect of the Invention As described above, the heat pump type air conditioner of the present invention is capable of defrosting while maintaining high heating capacity by storing heat in the heat storage tank during heating operation and utilizing this heat during defrosting operation.
Further, even when the heating operation is started up, the accumulated heat can be used to exert a high heating capacity regardless of the outside air temperature.

[Brief description of drawings]

FIG. 1 is a refrigeration cycle diagram of a heat pump type air conditioner according to an embodiment of the present invention, FIG. 2 is a diagram showing operating states of valves during each operation of the heat pump type air conditioner, and FIG. 3 is the same. FIG. 4 is a characteristic diagram of the heat pump type air conditioner showing a refrigeration cycle in the defrosting mode using heat storage in the heat pump type air conditioner, and FIG. 4 is a characteristic diagram of the heat pump type air conditioner. 1 ... compressor, 2 ... four-way valve, 3 ... indoor heat exchanger,
4 ... Electric expansion valve (pressure reducer), 5 ... Outdoor heat exchanger,
10 to 15 …… Two-way valve (flow path control means), 16 …… Heat storage tank, 17
...... Heat storage material, 18 …… Heat storage heat exchanger, 19 …… Auxiliary expansion device (auxiliary decompressor), ▲ ▼ …… First bypass circuit, ▲
▼ …… Second bypass circuit, ▲ ▼ …… Third bypass circuit.

Claims (8)

[Claims] Claim: What is claimed is: 1. A compressor, an outdoor heat exchanger, a decompressor, and an indoor heat exchanger are sequentially connected in an annular shape by pipes to form a main refrigerant circuit, and the discharge of the compressor which becomes the high pressure side during operation. A first bypass circuit having a heat storage heat exchanger that bypasses a part of the piping from the side to the pressure reducer; a second bypass circuit that bypasses the pressure reducer and has an auxiliary pressure reducer and the heat storage heat exchanger; A third bypass circuit that bypasses the outdoor heat exchanger, the first bypass circuit is opened during heat storage heating, the second bypass circuit and the third bypass circuit are closed, and the first bypass circuit is during defrosting. And a flow path control means for flowing a part of the refrigerant flowing through the outdoor heat exchanger to the third bypass circuit by closing the second bypass circuit and the third bypass circuit. Conditioner. 2. A discharge of the compressor which becomes a high pressure side during operation by connecting a compressor, an outdoor heat exchanger, a decompressor, and an indoor heat exchanger in order by a pipe to form a ring. A first bypass circuit having a heat storage heat exchanger that bypasses a part of the piping from the side to the pressure reducer; a second bypass circuit that bypasses the pressure reducer and has an auxiliary pressure reducer and the heat storage heat exchanger; A third bypass circuit that bypasses the outdoor heat exchanger, the first bypass circuit is opened during heat storage heating, the second bypass circuit and the third bypass circuit are closed, and the first bypass circuit is during defrosting. Is closed and the second bypass circuit and the third bypass circuit are opened so that a part of the refrigerant flowing through the outdoor heat exchanger is caused to flow into the third bypass circuit, and the second bypass circuit is operated at the start of operation of heat storage utilization. Circuit and a heat pump type air conditioner having a flow path control means for flowing the whole of the refrigerant flowing through the outdoor side heat exchanger to the third bypass circuit the third bypass circuit is opened. 3. The compressor according to claim 1 or 2, wherein the compressor is a variable capacity compressor, and the compressor is operated at high capacity during heat storage heating.
A method for controlling the heat pump type air conditioner described. 4. A heat storage tank for storing the heat generated in the heat storage heat exchanger, and a heat storage amount detecting means for detecting the heat storage amount of the heat storage tank, wherein the flow path control means is based on a signal from the heat storage amount detecting means. The heat pump type air conditioner according to claim 1 or 2, wherein the refrigerant passages are switched by means of the heat pump type air conditioner. 5. The heat storage amount detecting means is provided in each of the pipes connected to the inlet side and the outlet side of the heat storage heat exchanger.
The heat pump type air conditioner according to claim 4, wherein the heat pump type air conditioner is composed of individual temperature detecting elements. 6. A discharge of the compressor, which becomes a high-pressure side during operation, by connecting a compressor, an outdoor heat exchanger, a decompressor, and an indoor heat exchanger in this order by a pipe to form a main refrigerant circuit. A first bypass circuit having a heat storage heat exchanger that bypasses a part of the piping from the side to the pressure reducer; a second bypass circuit that bypasses the pressure reducer and has an auxiliary pressure reducer and the heat storage heat exchanger; A third bypass circuit that bypasses the outdoor heat exchanger, and a flow path control unit that controls opening and closing of each of the bypass circuits are provided, and the first bypass circuit is a high pressure side during operation of the compressor discharge side. To the pressure reducer, a first pipe having one end connected to the pipe, and a second pipe having one end connected to the other end of the first pipe and the other end connected to the refrigerant inflow end of the heat storage heat exchanger, Connect one end to the refrigerant outflow end of the heat storage heat exchanger A third pipe, a fourth pipe having one end connected to the other end of the third pipe, one end connected to the other end of the fourth pipe, and the other end having the depressurized pressure downstream from one end of the first pipe. The second bypass circuit has one end connected to a pipe from the indoor heat exchanger to the pressure reducer, and the other end connected to the first pipe other than the first pipe. A sixth pipe connected to an end and having the auxiliary decompressor, the second pipe, the third pipe, and one end connected to the other end of the third pipe, and the other end from the decompressor to the chamber A heat pump type air conditioner composed of a seventh pipe connected to a pipe to the outer heat exchanger. 7. The third bypass circuit includes a sixth pipe, a second pipe, a third pipe, a seventh pipe, a fourth pipe, and the fourth pipe.
The heat pump type air conditioner according to claim 6, further comprising: an eighth pipe having one end connected to the other end of the pipe and the other end connected to the suction side pipe of the compressor from the outdoor heat exchanger. 8. A four-way valve for connecting the discharge side pipe and the suction side pipe of the compressor and switching the direction of the refrigerant flowing through the indoor heat exchanger, the pressure reducer and the outdoor heat exchanger, and both ends of the first bypass circuit. The heat pump type air conditioner according to any one of claims 1 to 4, wherein is connected to a pipe from the discharge side of the compressor to the four-way valve.