JPH01127872A - Heat pump device - Google Patents

Abstract

PURPOSE: To improve efficiency of heating and defrosting operation, and shorten defrosting time by storing heat in a heat storage material with the aid of a refrigerant after completing heating at all times upon heating operation, and defrosting an outdoor heat exchanger utilizing stored heat without interrupting the heating even upon defrosting operation. CONSTITUTION: Refrigerant liquid demonstrating heating effect and effusing an indoor heat exchanger 3 is divided after passage through an opening/closing valve 21, a part of which is sent to a heat exchanger 11 in a heat storage unit 9 and a main part of which is sent to a pressure reducing apparatus 30. The partial refrigerant liquid is stored in a heat storage material 11 and is guided to a refrigeration cycle after passage through a pressure reducing apparatus 12 and a check valve 24. In contrast, the main refrigerant liquid becomes a 2 phase refrigerant of a gas/liquid mixture in the pressure reducing apparatus 30 and enters a gas/liquid separator 26. It is separated here to liquid and gas, and the separated gas passes through an opening/closing valve 25 and is absorbed into an injection port 1a of the compressor 1. Further, upon defrosting operation, the refrigerant sent to an outdoor heat exchanger 5 and defrosted enters the heat exchanger 11 in the heat storage unit 9 after passage through the pressure reducing apparatus 11. It absorbs heat there and becomes refrigerant gas, and is returned to the compressor 1 after passage through an opening/closing valve 23.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The invention relates to a heat pump device that performs defrosting using heat stored in a heat storage material.

[Conventional technology]

FIG. 2 is a configuration diagram of a refrigerant circuit showing a refrigeration cycle of a conventional heat pump device disclosed in Japanese Unexamined Patent Publication No. 125555/1982.

In FIG. 2, 1 is a compressor, 2 is a four-way valve, 3 is an indoor heat exchanger, 4 is a first pressure reducing device, 5 is an outdoor heat exchanger,
A refrigeration cycle is constructed by sequentially connecting these members in a ring shape.

A bypass Ws1 whose one end is connected to the first three-way valve 6 provided between the four-way valve 2 of the refrigeration cycle and the indoor heat exchanger WI3.
The other end of 3 is connected between the indoor heat exchange @ 3 and the first pressure reducing device 4, and a heat storage circuit 14 is connected between this connection and the first pressure reducing device 4.
both ends are connected.

The heat storage circuit 14 includes a second pressure reducing device M12, a second three-way valve 7, and a heat exchanger fil that exchanges heat with the heat storage material 10 filled in the heat storage device 9.
1ll are provided in this order, and the heat exchanger 11 is connected to the refrigerant circuit near the first pressure reducing device 4 via the third three-way valve 8. Further, a heat storage device 1@14 is connected via a second three-way valve 7 between the four-way valve 2 of the refrigerant circuit and the suction side of the compressor 1 via a first storage unit 17. In addition, 15 in Figure 2
．． 16 is the first. This is an on-off valve provided in the bypass @path of the second pressure reducing device 74.12.

The operation of the conventional heat pump device configured as described above will be explained.

During cooling operation, the refrigerant discharged from the compressor 1 is
It flows as shown by the solid arrow in the figure, and returns to the compressor 1 via the four-way valve 2, the outdoor heat exchange vs5, the first pressure reducing device 4, the third three-way fp8, the indoor heat exchanger 3, and the first three-way valve 6. In addition, during heating operation, the refrigerant discharged from the compressor 1 flows as shown by the broken arrow in FIG. It returns to the compressor 1 via the device 4, the outdoor heat exchanger 5, and the four-way valve 2, and in this case, heat is not stored in the heat storage material 10. During heat storage operation, the refrigerant discharged from the compressor 1 is transferred to the four-way valve 2 and the second three-way valve 7.
, the refrigerant passes through the on-off valve 16 and the second three-way valve 7 to the heat exchanger 11 in the heat storage device 9, and heat is radiated from the refrigerant to the heat storage material 10 in the heat storage device 9 and stored therein. , reduced pressure value W4
, the outdoor heat exchanger 5, and the four-way valve 2 before returning to the compressor 1, and in this case, heating is not performed.

During defrosting operation, the refrigerant discharged from the compressor 1 is
Figure 1Jii! Flow as shown by the arrow, four-way valve 2, 1st
The refrigerant is guided through the three-way valve 6, the indoor heat exchanger 3, and the on-off valve 16 to the heat exchanger 11 in the W heater 9, where the refrigerant is heated by the heat stored in the heat storage material 10, and exits the heat storage Wi9. teeth,
It is guided to the outdoor heat exchanger Wi5 through the third three-way valve 8 and the on-off valve 15, and is used to melt the frost adhering to the heat exchanger 5.
It returns to compressor 1 via . In this heat pump device, the heat storage operation described above is performed only when the load on the indoor heat exchanger N3 is small, and residual heat in the refrigeration cycle is stored in the heat storage material 10 in the heat storage device 9.

[Problem 3 to be solved by the invention In the conventional heat pump device configured as above,
Heating is not performed during heat storage operation, and 1f of heat is applied to the heat storage material only when the load on indoor heat exchange Wi3 is small, resulting in a problem that efficiency during heating and defrosting operation is not good.

This invention was made in order to solve the above-mentioned problems. During heating operation, the refrigerant used after heating is used to store heat in the heat storage material in the heat storage device without reducing the heating capacity. In addition, during defrosting operation, the outdoor heat exchanger can be defrosted using the heat stored in the heat storage material without stopping heating, allowing efficient heating and defrosting operation. The aim is to obtain a heat pump device that takes less time.

[Means for solving problems]

The heat pump device according to the present invention includes a heating heat storage circuit in which a second pressure reducing device is connected to a heat exchanger built in a heat storage device.
It is installed between the indoor heat exchanger of the refrigeration cycle and the first pressure reducing device through valves provided at the inlet and outlet ends of this circuit, and during defrosting operation, the heat storage material built in the heat storage device is used to connect the outdoor heat exchanger to the outdoor heat exchanger. A defrosting circuit that heats the refrigerant discharged from the refrigeration cycle is inserted between the outdoor heat exchanger of the refrigeration cycle and the suction side of the pressure m*, and a valve provided on the inlet end side of the heating heat storage circuit
The inlet end of a pipe having a No. 37) iJ pressure-equipped color gas-liquid separator is connected between the heat exchanger built in the 1. +mri
An injection circuit connected to the refrigeration cycle between the inlet end and the outlet end of the J heat storage circuit, and equipped with a valve that allows communication between the injection boat of the compressor and the gas outlet of the gas-liquid component G1 volume only during heating operation. They are connected by a circuit.

[Effect]

In the heat pump device of the present invention, during heating operation, the second. The weight of the refrigerant that exits the indoor heat exchanger and enters the heating heat storage circuit is adjusted by the aperture of the third pressure reducing device, and only a portion of this refrigerant liquid is passed through the heat exchanger in the heat storage board to store heat. Most of the refrigerant liquid that is the main stream that has entered the heating heat storage circuit is led to the gas-liquid separator through the third pressure reducing device, and the gas separated here is supplied to the injection boat of the compressor through the injection circuit, thereby reducing the amount of refrigerant gas. Injection is carried out effectively, and heat can be stored in the heat storage material without reducing the heating capacity, allowing sufficient heating and heat storage.

Also, during defrosting operation, the refrigerant discharged from the indoor heat exchanger is
The refrigerant is passed through a pressure reduction device and an outdoor heat exchanger to melt the frost adhering to the heat exchanger, and then led to a defrosting circuit, where the refrigerant passing through the defrosting circuit is heated with the heat stored in the heat storage material and pressurized. 1li
The evaporation temperature of the refrigerant can be maintained at a high level, and heating continues even during defrosting operation.
The cells and defrosting operation can be performed efficiently, and the defrosting time can be shortened.

〔Example〕

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

FIG. 1 is a refrigerant circuit diagram of a refrigeration cycle showing a heat pump device according to an embodiment of the present invention. In FIG. 1, 1 is a compressor having an injection boat 1a, 2 is a four-way valve, 3 is an indoor heat exchanger, 4 is a first pressure reducing device,
Reference numeral 5 denotes an outdoor heat exchanger, and these members are successively connected to form a refrigeration cycle. Reference numeral 18 denotes a heating heat storage circuit, and in this circuit 18, a first pressure reducing device 12 is connected to a heat exchange @11 built in the heat storage device 9 together with a heat storage material 10. A first on-off valve 19 is provided between the heat exchanger 3 of the refrigeration cycle and the first pressure reducing device 4, and the inlet end of the heating heat storage circuit 18 is connected to the indoor heat exchanger WI3 of the refrigeration cycle through the third on-off valve 21. 1 on-off valve 19 , and the outlet end of the heating heat storage circuit 18 is connected immediately before the first pressure reducing device 4 of the refrigeration cycle via the first check valve 24 . It is a gas-liquid separator whose inlet end is connected via a third pressure reducing device 30 to a pipe line 32 whose inlet end is connected between the third on-off valve 21 and the heat exchanger 11, and the gas-liquid separator 26 is The bottom is connected to the refrigeration cycle between the inlet end and the outlet end of the heating heat storage circuit 18 via the second check valve 31, and the gas-liquid separator 2
A gas outlet provided at the upper part of the compressor 6 is connected to the injection port I-1a of the compressor 1 through an injection circuit 27 having a sixth on-off valve 25. Reference numeral 29 denotes a defrosting circuit, and this circuit 29 has an intermediate portion that shares the heating heat storage circuit 18, the second pressure reducing device 12, and the heat exchanger 11. A second rJIJ closing valve 20 is provided between the outdoor heat exchanger 5 of the refrigeration cycle and the four-way valve 2, and the inlet end of the defrosting circuit 29 is connected to the outdoor heat exchanger @5 of the refrigeration cycle and the fourth opening/closing valve 22. Connected between 2 on-off valves 20, defrosting times $29
The outlet end is connected to the heat exchanger 11 of the heating heat storage circuit 18 and the pipe line 32
The four-way valve 2 of the refrigeration cycle is connected to a pipe 28 branched from between the branch parts of the pipe 28 through a fifth rM closing valve 23 provided in this pipe 28.
and the compressor 4!11 inlet.

Note that the heat storage material 10 filled in the heat storage I#9 is a heat storage material utilizing latent heat such as water, various paraffins, and calcium chloride mixed salts having a phase change temperature between 0° C. and 30° C. Further, in FIG. 1, solid line arrows indicate the flow direction of the refrigerant during cooling operation, broken line arrows indicate the flow direction of the refrigerant during heating operation, and chain line arrows indicate the flow direction of the refrigerant during defrosting operation.

Next, the operation of the heat pump device of the embodiment configured as above will be explained.

During cooling operation, the first The second R closing valves 19, 20 are open, and the third to fifth opening/closing valves 21 to 23, 25 are closed. The refrigerant discharged from the compressor 1 is sent to the indoor heat exchanger 3 via the four-way valve 2, the outdoor heat exchange @5, and the first pressure reducing device 4, where it is used for cooling, and then passes through the four-way valve 2. Compressor 1
will be returned to.

During heating operation, the second Third. 6th on-off valve 20°21.
25 is open, 1st. 4th. The fifth on-off valve 19°22.23 is closed. The high-temperature, high-pressure refrigerant gas discharged from the compressor 1 is sent to the indoor heat exchanger 3 through the four-way fp2, where it radiates heat, is used for heating, and is liquefied. To explain an example of temperature change at this time, indoor air changes from 20℃ to 40℃ due to the heating effect of the refrigerant.
The refrigerant is heated to a certain degree and used for heating, and the refrigerant becomes a refrigerant liquid at around 40° C. by dissipating heat to the air and exits the indoor heat exchange W3. The refrigerant liquid that exits the indoor heat exchanger 3 after exerting its chamber effect is divided after passing through the third on-off valve 21, and a part is sent to the heat exchanger 11 in the heat storage device 9, and the main flow is sent to the heat exchanger 11 in the heat storage device 9. 3 is sent to the pressure reducing device 30. Since the heat storage material 10 having a phase change temperature between 0° C. and 30° C. is filled in the heat storage device 9, the heat storage material 10 is heated by a part of the refrigerant liquid sent to the heat exchanger 911. Heat is stored by changing from solid to liquid. A part of the refrigerant leaving the heat exchanger Wi11 is transferred to the second pressure reducing device 12,
It passes through the first check valve 24 and is led to the refrigeration cycle near the inlet of the first pressure reducing device 4. The mainstream refrigerant liquid sent to the third wt pressure device 30 passes through the third pressure reducing device 30 and is reduced in pressure to an intermediate pressure between high pressure and low pressure, and becomes a two-phase refrigerant with gas wR mixture. Enter @26. This two-phase refrigerant is separated into liquid and gas by the gas-liquid molecule jIa 26, and only the refrigerant liquid passes through the second check valve 31 and is combined with a part of the refrigerant that has passed through the second pressure reducing device 12 to be transferred to the first pressure reducing device. 4, where it becomes a low-temperature, low-pressure two-phase refrigerant, and then sent to the outdoor heat exchange board 5, where it absorbs heat and evaporates. The evaporated refrigerant gas is
It passes through the second opening/closing fP20 and the four-way valve 2 and returns to the compression aI11. The cycle described above is then repeated.

Further, the refrigerant gas separated from the refrigerant liquid in the gas-liquid separator 26 passes through the sixth on-off valve 25 and is then transferred to the injection circuit i.
Injection port 1 of compressor 1 by i@27
It is inhaled by a. For this reason, injection port 1
The refrigerant flow rate on the high-pressure side increases by 6% compared to the case where no refrigerant gas is sucked into the injection port, and therefore the high-pressure side capacity (condensing capacity) including heating capacity and heat storage capacity is not injected. compared to the previous case, and the heating performance improves.

However, in order to operate the injection effectively, the degree of subcooling of the refrigerant liquid entering the third wt pressure device 30 becomes a problem. If the degree of supercooling is large, the flow rate of the refrigerant sucked into the injector 1a will be reduced, and the heating performance by injection will not be fully demonstrated.

Also,[! ! After switching from cooling operation to defrosting operation, the heat storage material 10 in the heat storage device 9 absorbs heat and has a considerably low temperature for a certain period of time, and there is a large temperature difference between it and the refrigerant entering the heat exchanger 11. When all the refrigerant that has exited the indoor heat exchanger 3 flows into the heat exchanger 11 in the heat storage device 9, the amount of heat exchanged here (
W heat amount) becomes too large. For this reason, the heat exchanger 11
The degree of supercooling of the refrigerant liquid that has exited the heating system increases, and if this refrigerant liquid is used for injection operation, it is no longer possible to improve the heating capacity by injection.

In this embodiment, in consideration of the above, the throttling amount of the second and third pressure reducing devices fi12,30'' is controlled so that the second pressure reducing device 12 is considerably larger than the third pressure reducing device ¥130. By doing so, the refrigerant liquid that has exited the indoor heat exchanger 3 is transferred to the heat exchanger 11 in the heat storage device 9 to store heat, and the main flow of the refrigerant liquid passes through the third pressure reducing device M30. By entering the gas-liquid separator 26 and being injected into the compressor 1, the injection can be performed using the refrigerant liquid with a small degree of supercooling that has exited the indoor heat exchanger 3. Therefore, the injection can be carried out effectively. While demonstrating its functionality,
Heat storage can be performed. Although it takes a long time to store heat using the controller 1-roll, normally more than one hour elapses during heating operation from the end of defrosting to the start of the next defrosting operation, so there is sufficient time to store heat in the heat storage material 10. There is MJ? There is no risk of running out of A.

Furthermore, heat storage is performed using the refrigerant liquid after the high-temperature, high-pressure refrigerant gas passes through the indoor heat exchanger 3 and is condensed, so the heating capacity does not decrease due to heat storage.

Next, during defrosting operation, the first. 4th. Fifth on-off valve 19,
22.23 opened, 2nd. Third. Sixth on-off valve 20, 21.
25 is closed. The high-temperature, high-pressure refrigerant gas discharged from the compressed fil is sent to the indoor heat exchange@3 through the four-way valve 2, where heat is radiated and heating is performed, but the heating effect is not fully exerted. The refrigerant is sent to the first pressure reducing device 4 through the first WJ closing valve 19 in the state of a gas-liquid mixed two-phase refrigerant with some refrigerant gas remaining. Here, the gas-liquid mixed two-phase refrigerant is depressurized to a pressure between low pressure and high pressure, and is sent to the outdoor heat exchanger 5 with a condensation degree of, for example, about 10°C to 20°C, where it radiates heat. This causes the entire refrigerant to condense and become a refrigerant liquid.

The frost adhering to the outdoor heat exchanger i15 is melted by the heat radiation described above, and defrosting is performed. The refrigerant liquid exiting the outdoor heat exchanger M5 passes through the fourth rIR closing valve 22 and enters the second pressure reducing device 1.
2, the refrigerant becomes a low-temperature, low-pressure gas-liquid mixed two-phase refrigerant and enters the heat exchanger 11 in the heat storage device 9. Here, the two-phase refrigerant absorbs the heat stored in the heat storage material 10, evaporates, and returns to the compressor 1 via the fifth on-off valve 23 as a refrigerant gas. The cycle described above continues until defrosting is completed, and then m! It becomes jJ driving.

The above-mentioned defrosting operation is performed using the heat storage material 10 having a phase change temperature between 0°C and 30°C as a heat source, so the evaporation temperature of the refrigerant is higher than when heating is performed using outside air as a heat source. heat dissipation capacity is greatly increased. For this reason,
Even if the heat dissipation capacity of the refrigerant is divided between heating and defrosting, the heating capacity is maintained almost the same as in the case of an outside air heat source, and the defrosting time is also shortened.

In this embodiment, during defrosting operation, the pressure of the refrigerant flowing through the outdoor heat exchanger 5 is reduced by the first pressure reducing device 4 to an intermediate pressure, and the refrigerant radiation temperature for defrosting is adjusted to 10°C to 20°C. are doing. In this adjustment, if a refrigerant at a temperature of 40°C to 50°C, which is the same as that during heating operation, is flowed through the outdoor heat exchanger 5 without using the first pressure reducing device 4, the condensation heat of the refrigerant is used for defrosting. In addition to this, this is to prevent an increase in heat radiation loss, which is radiation to the outside air.

As mentioned above, in this embodiment, a gas injector crayon circuit is used during heating operation, and heat is stored using the refrigerant after leaving the indoor FI exchanger, so that sufficient heat can be stored without reducing heating capacity. During defrosting operation, since the heat storage material is used as a heat source, the evaporation temperature of the refrigerant can be maintained high, and there is an effect that heating equivalent to that during normal heating operation can be performed at the same time as defrosting.

In addition, in the above embodiment, the first. Third on-off valve 19.2
1 and 2. Each of the fourth on-off valves 20.22 can be replaced by one three-way valve, and the fifth. 6th rM valve closing 2
3 and 25 can be replaced with check valves, and 1. The second check valve 24.31 can be replaced with an on-off valve.

Further, in the present invention, the defrosting circuit has an inlet end connected to the refrigeration cycle between the outdoor heat exchanger and a valve that is provided between the outdoor heat exchanger of the refrigeration cycle and the four-way valve and is closed only during defrosting operation. , and the fourth pressure reducing device and the endothermic heat exchanger provided in the heat storage device are connected in this order, and the outlet end is connected between the valve that is closed only during the defrosting operation and the four-way valve. It can be changed as appropriate as long as the refrigerant discharged from the outdoor heat exchanger during frost operation is heated by the heat storage material stored during heating operation and returned to the compressor.

〔Effect of the invention〕

As explained above, according to the present invention, during heating operation, the second. By controlling the throttling amount of the third pressure reducing device, only a part of the refrigerant liquid that came out of the indoor heat exchanger and entered the heating heat storage circuit is passed through the heat exchanger in the heat storage device to store heat, and the heating Most of the refrigerant liquid that has entered the circuit passes through the third pressure reducing device and is guided to the gas-liquid separator.The refrigerant gas separated here is supplied to the injection port 1 of the compressor through the injection circuit, and the refrigerant gas is In addition, heat can be stored in the heat storage material without reducing heating capacity, and sufficient heating and heat storage can be achieved. During defrosting operation, the refrigerant discharged from the indoor heat exchanger is transferred to the first ni-pressure device and The refrigerant is passed through an outdoor heat exchanger to melt the frost attached to the heat exchanger, and then guided to a defrosting circuit where the refrigerant passing through the defrosting circuit is heated by the heat stored in the heat storage material and returned to the compressor. As a result, the evaporation temperature of the refrigerant can be maintained high, efficient defrosting can be performed, and the defrosting time is shortened, which has the effect of defrosting and heating at the same capacity as when operating a normal RJI. .

[Brief explanation of the drawing]

FIG. 1 is a refrigerant circuit configuration diagram showing a refrigeration cycle of a heat pump device according to an embodiment of the present invention, and FIG. 2 is a refrigerant circuit configuration diagram showing a refrigeration cycle of a conventional heat pump device. 1... Compressor, la... Injector 9 boat, 2
...Four-way valve, 3.Indoor heat exchanger, 4.First pressure reducing device, 5.Outdoor heat exchanger, 9.Regenerator, 10.
...Heat storage material, 11..Heat exchanger, 12..Second pressure reducing device, 18.Heating heat storage circuit, 19-23.25..First-
5th degree 6th on-off valve, 24.31 1st. Second check valve, 26
... Gas-liquid @@, 27... Injection circuit, 29
...Defrosting circuit, 30...Third pressure reducing device. Note that the same reference numerals in the figures indicate the same or equivalent parts. Procedural amendment (voluntary) 20 Name of the invention Heat pump device 3, Representative of the person making the amendment Moriya Shiki 5, Subject of amendment (1) Scope of claims in the specification (2) Detailed description of the invention in the specification Explanation column (3) Drawing 6, Contents of amendment (1) The claims of the specification are amended as shown in the attached sheet. (2) On page 4, line 14 of the specification, and on page 4, line 19, “
"Second three-way valve 7" is corrected to "first three-way valve 6." (3) In the 15th line of the 4th page and the 2nd line of the 5th page, the words "decompression device 4" are respectively corrected to "first decompression device 4". (4) The words "bottom" on page 7, line 4 and page 9, line 12, respectively, are corrected to read "limb exit." (5) On page 17, lines 12 to 14, “Again...
・Delete the text "Can be done." (6) Amend Figure 2 of the drawing as per the attached sheet. 7. Attached documents (1) Document stating the entire text of the amended scope of claims
1 copy (2) Amended drawings
Document 2 stating the full text of the claims after one amendment, Claims (1) Refrigeration in which a compressor, a four-way valve, an indoor heat exchanger, a first pressure reducing device, and an indoor heat exchanger are sequentially connected In a heat pump device having a cycle, a second pressure reducing device is connected to a heat exchanger built into the evaporator together with a heat storage material, and an inlet end and an outlet end each have a valve between the indoor heat exchanger of the refrigeration cycle and the first pressure reducing device. A heating heat storage circuit that is connected through the heating heat storage circuit to store heat in the heat storage material using the refrigerant after heating has finished, and an inlet end connected between the indoor heat exchanger and the four-way valve of the refrigeration cycle, and an outlet end connected to the suction side of the compressor. and a fog removal circuit which heats the refrigerant discharged from the outdoor heat exchanger during defrosting operation using the heat stored in the heat storage material and returns it to the compressor, and a valve provided at the inlet end side of the heating heat storage circuit; The inlet end of a pipe having a third pressure reducing device and a gas-liquid separator is connected between the heat exchanger built in the heat storage device, and the JILnMm of the gas-liquid separator is connected to the heating via a valve that allows refrigerant to flow only during heating operation. In addition to being connected to the refrigeration cycle between the inlet end and the outlet end of the heat storage circuit, the compressor has an injection port, and this port and the gas outlet of the gas-liquid component 11!1 are connected to each other during heating operation. A heat pump device characterized in that the heat pump device is connected by an injector circuit provided with a valve that allows communication between the heat pump and the heat pump. (21II! The chamber heat storage circuit opens the heating heat storage circuit only during heating operation at the inlet end and connects the indoor heat exchanger of the refrigeration cycle with the first
A valve is provided to close the space between the pressure reducing device, a check valve is provided at the outlet end, and a valve is provided at the inlet end of the defrost circuit that opens the defrost circuit only during defrosting operation and closes the space between the outdoor heat exchange type of the refrigeration cycle. , the middle part shares the heating heat storage circuit with the second pressure reducing device and the heat exchanger, the heat exchanger of the heating heat storage circuit and the valve at the inlet end are branched, and the outlet end is connected through a valve that opens only during defrosting operation. The heat pump device according to claim 1, wherein the heat pump device is connected between a four-way valve of a refrigeration cycle and a suction port of a compressor.

Claims (2)

[Claims] (1) In a heat pump device having a refrigeration cycle in which a compressor, a four-way valve, an outdoor heat exchanger, a first pressure reducing device, and an indoor heat exchanger are sequentially connected, a second heat exchanger is installed in the evaporator together with a heat storage material. a heating heat storage circuit to which a pressure reducing device is connected, an inlet end and an outlet end of which are connected via valves between an indoor heat exchanger of a refrigeration cycle and a first pressure reducing device, and which causes heat to be stored in the heat storage material by refrigerant after completion of heating; The inlet end is connected between the outdoor heat exchanger and the four-way valve of the refrigeration cycle, and the outlet end is connected to the suction side of the compressor, and the refrigerant discharged from the outdoor heat exchanger during defrosting operation is stored in the heat storage material. and a defrosting circuit that heats with heat and returns it to the compressor, and a third pressure reducing device and a gas-liquid separator are installed between a valve provided on the inlet end side of the heating heat storage circuit and a heat exchanger built in the heat storage device. The bottom of the gas-liquid separator is connected to the refrigeration cycle between the inlet end and the outlet end of the heating heat storage circuit through a valve that allows refrigerant to flow only during heating operation, and the compressor 1. A heat pump device, characterized in that the device has an injection port, and the port and the gas outlet of the gas-liquid separator are connected by an injection circuit provided with a valve that allows communication between these ports only during heating operation. (2) The heating heat storage circuit is equipped with a valve at the inlet end that opens the heating heat storage circuit only during heating operation and closes between the indoor heat exchanger of the refrigeration cycle and the first pressure reducing device, and a check valve at the outlet end. The defrost circuit is provided with a valve at the inlet end that opens the defrost circuit only during defrosting operation and closes between the outdoor heat exchangers of the refrigeration cycle, and the intermediate part shares the heating heat storage circuit, the second pressure reducing device, and the heat exchanger.
Branches from between the heat exchanger of the heating storage circuit and the valve at the inlet end,
The heat pump device according to claim 1, wherein the outlet end is connected between the four-way valve of the refrigeration cycle and the suction port of the compressor via a valve that opens only during defrosting operation.