JPH07301459A - Heat pump apparatus - Google Patents

Abstract

PURPOSE:To allow liquid-phase refrigerant to be scarcely retained in an accumulator and to prevent overheating of vapor-phase refrigerant in the accumulator by so providing heating means for heating in the accumulator of a heat pump apparatus as to be switched to a heating state and a heat stopping state. CONSTITUTION:A heat pump circuit has an outdoor unit A having a compressor unit U, two indoor units B, C, and connecting tubes R1-R3 for connecting the outdoor unit A to the units B, C. The unit U has a compressor Cmp, an accumulator Acc for separating liquid-phase refrigerant from refrigerant to store it, and an oil separator Osp. The accumulator Acc has an electric heater 1 and heat generation type temperature sensors 2a, 2b as liquid-phase refrigerant detecting means 2 for detecting liquid-phase refrigerant Ri separated by the accumulator Acc. A switch 3 is opened or closed based on the liquid-phase refrigerant detected result to switch the heater 1 to a heating state or a heat stopping state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump device provided with an accumulator capable of separating a liquid phase refrigerant from a refrigerant introduced into a compressor.

[0002]

2. Description of the Related Art A conventional heat pump device is not provided with a heating means for positively heating the liquid phase refrigerant separated in the accumulator.

[0003]

Therefore, a large amount of liquid-phase refrigerant is likely to accumulate in the accumulator, and the gas-phase refrigerant to be introduced into the compressor is insufficient, so that the heat pump device cannot exert its predetermined ability. Alternatively, there is a drawback that the liquid-phase refrigerant accumulated in the accumulator is sucked into the compressor and the compressor is easily operated in the liquid compression state.

These drawbacks become particularly noticeable at the start of the operation in the cold season or at the start of the operation when the heat exchanger functioning as the condenser is switched to the function as the evaporator.

Therefore, as a means for solving these drawbacks, for example, it is conceivable to provide a heating means for actively heating the liquid-phase refrigerant separated by the accumulator. However, if the heating means is simply provided, the accum There is a risk that the gas-phase refrigerant in the evaporator will be unnecessarily heated.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a heat pump device in which a liquid-phase refrigerant is less likely to accumulate in an accumulator in a state in which a gas-phase refrigerant in the accumulator is less likely to be overheated. To aim.

Another object of the present invention is to enable a heat pump device in which a liquid-phase refrigerant is hard to collect in an accumulator to be efficiently operated in a state in which a gas-phase refrigerant in the accumulator is hardly heated excessively. To do.

Another object of the present invention is to make it possible to easily operate a heat pump device in which a liquid-phase refrigerant is less likely to accumulate in an accumulator while the gas-phase refrigerant in the accumulator is less likely to be overheated. To do.

Another object of the present invention is to make it possible to simplify the structure of the heat pump device in which the liquid phase refrigerant is less likely to accumulate in the accumulator.

Another object of the present invention is to prevent liquid phase refrigerant from accumulating in the accumulator without complicating the heat pump structure.

[0011]

A characteristic configuration of the present invention for achieving the above object is a heat pump device provided with an accumulator capable of separating a liquid phase refrigerant from a refrigerant introduced into a compressor. The heating means for heating the inside of the accumulator is provided so as to be switchable between a heating state and a heating stop state.

Liquid phase refrigerant detecting means for detecting the liquid phase refrigerant separated by the accumulator, and the heating means can be switched between a heating state and a heating stop state based on the detection result by the liquid phase refrigerant detecting means. When the control means is provided, the heat pump device in which the liquid-phase refrigerant hardly accumulates in the accumulator can be efficiently operated while the gas-phase refrigerant in the accumulator is hard to be heated.

When the heating means is switched to the heating state for a set time based on the detection result of the constant amount of the liquid phase refrigerant by the liquid phase refrigerant detecting means, the liquid phase refrigerant is unlikely to be accumulated in the accumulator. Heat pump device,
The gas-phase refrigerant in the accumulator can be easily operated in a state where it is difficult to heat it.

When the heat source of the heating means is the refrigerant circulating in the heat pump circuit, the structure of the heat pump device in which the liquid-phase refrigerant is less likely to accumulate in the accumulator can be simplified.

When the heat source of the heating means is a heat source different from the refrigerant circulating in the heat pump circuit, it is possible to prevent the liquid-phase refrigerant from accumulating in the accumulator without complicating the heat pump structure.

[0016]

[Function] By heating the inside of the accumulator, the liquid-phase refrigerant separated by the accumulator becomes easy to evaporate, and the liquid-phase refrigerant is less likely to accumulate in the accumulator. However, if the inside of the accumulator is constantly heated, Instead, the heating means can be switched between the heating state and the heating stop state, and the liquid-phase refrigerant separated by the accumulator can be evaporated if necessary, so that the gas-phase refrigerant in the accumulator is unnecessarily heated. There is little fear.

Liquid-phase refrigerant detecting means for detecting the liquid-phase refrigerant separated by the accumulator, and control means capable of switching the heating means between the heating state and the heating stop state based on the detection result of the liquid-phase refrigerant detecting means. Is provided, the liquid-phase refrigerant can be efficiently vaporized without any trouble.

When the heating means is switched to the heating state for the set time on the basis of the detection result of the constant amount of the liquid phase refrigerant by the liquid phase refrigerant detecting means, the timing for switching the heating means to the heating stop state is particularly detected. Without doing so, it is possible to efficiently evaporate a predetermined amount of liquid-phase refrigerant without trouble.

When the heat source of the heating means is a refrigerant circulating in the heat pump circuit, the liquid-phase refrigerant separated in the accumulator can be evaporated without separately providing a heat source for heating.

When the heat source of the heating means is a heat source different from the refrigerant circulating in the heat pump circuit, the liquid-phase refrigerant separated in the accumulator is evaporated without changing the circulation structure of the refrigerant. be able to.

[0021]

In the heat pump device according to the first aspect of the present invention, the liquid-phase refrigerant is less likely to accumulate in the accumulator in a state where the gas-phase refrigerant in the accumulator is less likely to be overheated.

The heat pump device according to the second aspect can efficiently operate the heat pump device in which the liquid-phase refrigerant is less likely to accumulate in the accumulator while the gas-phase refrigerant in the accumulator is less likely to be overheated.

The heat pump device according to the third aspect can easily operate the heat pump device in which the liquid-phase refrigerant is less likely to accumulate in the accumulator in a state in which the gas-phase refrigerant in the accumulator is less likely to be overheated.

In the heat pump device according to the fourth aspect, the structure of the heat pump device in which the liquid-phase refrigerant is hard to collect in the accumulator can be simplified.

In the heat pump device according to the fifth aspect, it is possible to prevent the liquid-phase refrigerant from accumulating in the accumulator without complicating the heat pump structure.

[0026]

【Example】

[First Embodiment] FIGS. 1 and 2 show a heat pump circuit of a heat pump air conditioner as an example of a heat pump device, which includes an outdoor unit A having a compressor unit U, a first indoor unit B, and a second indoor unit. Two indoor units C and C, a first crossover pipe R1 for the high-pressure vapor-phase refrigerant, a second crossover pipe R2 for the low-pressure vapor-phase refrigerant, and a third crossover pipe R3 for the liquid-phase refrigerant are provided, and the outdoor The machine A and the first and second indoor units B and C are connected to the first, second and third indoor units.
Compressor C connected via connecting pipes R1, R2, R3
The refrigerant circulation path for circulating the refrigerant in the order of mp, condenser Cd, expansion means Ex, and evaporator Ev is configured to be connected according to the air conditioning operation mode.

In the heat pump circuit, the thick black line indicates that the refrigerant in that portion is in the high-pressure vapor phase state, and the thick hatched line indicates that the refrigerant in that portion is in the liquid phase state. The thick line with dot hatching indicates that the refrigerant in that portion is in the gas-liquid two-phase state (wet vapor state), and the thick white line indicates that the refrigerant in that portion is in the low-pressure vapor phase state. Further, in the heat pump circuit, a white valve symbol indicates a state where the valve is open, and a black valve symbol indicates a state where the valve is closed.

In the outdoor unit A, there are a first outdoor heat exchanger AN1 and a second outdoor heat exchanger AN for absorbing and radiating outside air OA.
No. 2 and two outdoor heat exchangers are installed in parallel, and the first outdoor fan AF1 that ventilates the outside air OA to the first outdoor heat exchanger AN1.
And a second outdoor heat exchanger AN2 that ventilates the outside air OA
The outdoor fan AF2, the first outdoor expansion valve Aex1 connected to the first outdoor heat exchanger AN1, the second outdoor expansion valve Aex2 connected to the second outdoor heat exchanger AN2, and the liquid receiver Rcv. , A fourth solenoid valve V4 capable of switching between a state in which the refrigerant is circulated through the first outdoor heat exchanger AN1 and a state in which the circulation is stopped are provided, and the first and second outdoor expansion valves Aex1, Aex2 is the receiver Rcv
Is connected to the third connecting pipe R3 via.

The compressor unit U includes a compressor Cmp.
And an accumulator Acc capable of separating and storing the liquid-phase refrigerant from the refrigerant introduced into the compressor Cmp and an oil separator Osp, and the second crossover pipe R2 and the accumulator Acc being the first low-pressure gas phase. It is connected through the refrigerant path RL1, and has an accumulator Acc and a compressor Cmp.
Of the compressor Cmp and the oil separator Osp are connected to each other through the second low-pressure gas-phase refrigerant passage RL2.
And are connected via the high-pressure gas-phase refrigerant passage RH, and the oil separator Osp is connected so that the separated lubricating oil component is returned to the suction side of the compressor Cmp.

The discharge side of the compressor Cmp is connected to the first and second outdoor heat exchangers AN through the oil separator Osp.
1, a first solenoid valve V1 that can be switched between a connected state connected to the AN2 side and a non-connected state, and a connected state that connects the discharge side of the compressor Cmp to the first crossover pipe R1 side via an oil separator Osp. The second solenoid valve V2 that can be switched to the disconnected state, and the suction side of the compressor Cmp through the accumulator Acc to the first and second outdoor heat exchangers AN1 and A2.
A third solenoid valve V3 is provided which is connected to the N2 side and can be switched between a connected state and a non-connected state.

The first and second outdoor expansion valves Aex1, Ae
Each of the x2 has a flow rate adjusting means Vfr when the corresponding outdoor heat exchangers AN1 and AN2 function as the condenser Cd.
Is provided so that when the corresponding outdoor heat exchangers AN1 and AN2 function as evaporators Ev, they can be switched to operate as expansion means Ex.

In each of the first and second indoor units B and C,
Indoor heat exchangers BN and CN for cooling and heating air, and air SA1 and SA adjusted by the indoor heat exchangers BN and CN
Indoor fans BF, CF that send 2 to the corresponding air-conditioning target area
And indoor expansion valves Bex and Cex connected to the indoor heat exchangers BN and CN and the third transfer pipe R3, and the connected and disconnected states of the indoor heat exchangers BN and CN and the second transfer pipe R2. Fifth solenoid valves BV5 and CV5 that can be switched to and
A sixth solenoid valve BV6 capable of switching the indoor heat exchangers BN and CN and the first connecting pipe R1 between a connected state and a non-connected state.
CV6 is provided.

Each of the indoor expansion valves Bex and Cex is
When the corresponding indoor heat exchangers BN and CN function as the evaporator Ev, the indoor heat exchangers BN and CN are switched to a state in which they operate as the expansion means Ex, and the corresponding indoor heat exchangers BN and CN are condensed.
When it functions as d, it is configured to be switched to a state in which it operates as the flow rate adjusting means Vfr.

The accumulator Acc includes an electric heater 1 as a heating means for heating the inside of the accumulator Acc and a liquid-phase refrigerant detection means 2 for detecting the liquid-phase refrigerant Ri separated by the accumulator Acc. Based on the detection results of the individual heat generation type temperature sensors 2a and 2b and the liquid phase refrigerant detection means 2, the switch 3 is turned on / of.
After that, a controller Cnt which is a control means capable of switching the electric heater 1 between the heating state and the heating stop state is provided.

The two exothermic temperature sensors 2a, 2b
Are arranged at a vertical interval with their sensing parts facing the inner wall of the accumulator Acc, and the temperature sensors 2a, 2b of the respective temperature sensors 2a, 2b reach a predetermined sensing level of the liquid-phase refrigerant Ri. In that state, the sensing unit is cooled by the liquid-phase refrigerant Ri and outputs a low-temperature detection signal to the controller Cnt. In a state in which the storage level of the liquid-phase refrigerant Ri does not reach a predetermined sensing level, the sensing unit is in the liquid-phase refrigerant Ri. Since it is not cooled by Ri, it is connected to output a high temperature detection signal to the controller Cnt.

When the storage level of the liquid-phase refrigerant Ri reaches the predetermined sensing level of the upper temperature sensor 2a arranged on the upper side, a low temperature detection signal is input from the upper temperature sensor 2a to the controller Cnt, and the controller Cnt When it is judged that the storage level of the liquid-phase refrigerant Ri exceeds the allowable level, the switch 3 is turned on and the electric heater 1 is switched to the heating state.

Further, when the liquid-phase refrigerant Ri is evaporated by heating by the electric heater 1 and the storage level thereof falls below a predetermined sensing level of the lower temperature sensor 2b arranged on the lower side, a high temperature detection signal is output from the lower temperature sensor 2b. It is input to the controller Cnt, and the controller Cnt determines that the storage level of the liquid-phase refrigerant Ri has reached the appropriate level, turns off the switch 3, and switches the electric heater 1 to the heating stopped state.

FIG. 1 shows a state in which the air-conditioning operation mode is switched to a cooling mode in which the first and second indoor units B and C are cooled, and the outdoor unit A has the first solenoid valve V1 and the fourth electromagnetic valve V1. The second solenoid valve V2 and the third solenoid valve V3 are opened while the solenoid valve V4 is opened.
And are closed, the first and second outdoor heat exchangers AN1 and AN2 serve as condensers Cd, and the first and second outdoor expansion valves Aex.
1, Aex2 are connected so as to function as the flow rate adjusting means Vfr, and each of the first and second indoor units B, C is
Open the fifth solenoid valve BV5, CV5 and the sixth solenoid valve B
By closing V6 and CV6, the indoor expansion valves Bex and Cex are connected so as to function as expansion means Ex, and the indoor heat exchangers BN and CN function as evaporator Ev.

The high-pressure gas-phase refrigerant discharged from the compressor unit U is used as the first and second outdoor heat exchangers AN1, AN2.
Is introduced into each of the first and second outdoor heat exchangers AN1, A
The liquid-phase refrigerant derived from each of the N2 is the third connecting pipe R
The indoor expansion valve B of each of the first and second indoor units B and C
The refrigerant in the gas-liquid two-phase state introduced into ex, Cex and led out from the indoor expansion valves Bex, Cex is the indoor heat exchanger BN,
The low-pressure vapor-phase refrigerant introduced into the CN and derived from each of the indoor heat exchangers BN and CN is returned to the suction side of the compressor Cmp via the second transition pipe R2.

FIG. 2 shows a state in which the air conditioning operation mode is switched to a heating mode for heating the first and second indoor units B and C, and the outdoor unit A has the second solenoid valve V2 and the third electromagnetic valve V2. The solenoid valve V3 and the fourth solenoid valve V4 are opened and the first solenoid valve V1 is opened.
And the outdoor heat exchangers AN1 and AN2 are connected so as to function as an evaporator Ev, and the first and second outdoor expansion valves Aex1 and Aex2 function as expansion means Ex. Machines B and C each have a sixth solenoid valve BV6, C
V6 is opened and the fifth solenoid valves BV5 and CV5 are closed, and the indoor expansion valves Bex and Cex are connected so as to function as the flow rate adjusting means Vfr and the indoor heat exchangers BN and CN function as the condenser Cd. .

Then, the high-pressure vapor-phase refrigerant derived from the compressor unit U is introduced into the indoor heat exchangers BN and CN of the first and second indoor units B and C through the first connecting pipe R1.
The liquid-phase refrigerant derived from the indoor heat exchangers BN and CN passes through the third connecting pipe R3 and then the first and second outdoor expansion valves Aex.
The refrigerant in the gas-liquid two-phase state introduced into each of the first and second outdoor expansion valves Aex1 and Aex2 is introduced into each of the first and second outdoor heat exchangers AN1 and AN2. The low-pressure gas-phase refrigerant that has been discharged from each of the first and second outdoor heat exchangers AN1 and AN2 is returned to the suction side of the compressor Cmp.

[Second Embodiment] FIG. 3 shows a liquid-phase refrigerant detecting means 2 for detecting the liquid-phase refrigerant Ri separated by the accumulator Acc, and a heating means based on the detection result by the liquid-phase refrigerant detecting means 2. Another embodiment of the control means Cnt capable of switching the electric heater 1 between the heating state and the heating stop state is shown. The accumulator Acc has one exothermic temperature sensor 2 as liquid phase refrigerant detecting means, and this temperature. A controller Cnt, which is a control means that can switch the electric heater 1 between a heating state and a heating stop state by turning on / off the switch 3 of the electric heater 1 based on the detection result of the sensor 2, is provided. .

The temperature sensor 2 is arranged such that its sensing portion faces the inner surface of the vessel wall near the bottom of the accumulator Acc, and the storage level of the liquid-phase refrigerant Ri is a predetermined sensing level as in the first embodiment. It is connected so as to output the low temperature detection signal to the controller Cnt in the state where the temperature has reached, and to output the high temperature detection signal to the controller Cnt in the state where the storage level of the liquid-phase refrigerant Ri does not reach the predetermined sensing level.

When the storage level of the liquid-phase refrigerant Ri reaches the predetermined sensing level of the temperature sensor 2, a low temperature detection signal is input from the temperature sensor 2 to the controller Cnt, and the controller Cnt stores the liquid-phase refrigerant Ri. When it is determined that the level has reached the level corresponding to the liquid refrigerant Ri having a certain allowable amount, the switch 3 is turned on to switch the electric heater 1 to the heating state and the timer 4 starts the time measurement to reach the certain allowable amount. When the preset time set as the minimum heating time necessary to evaporate the entire amount of the liquid-phase refrigerant has expired, the switch 3 is turned off to switch the electric heater 1 to the heating state and the timer 4 is reset. It is configured as follows. Other configurations are similar to those of the first embodiment.

[Third Embodiment] In the first and second embodiments, the heat generation type temperature sensor is provided with a low temperature detection signal to the controller Cnt when the storage level of the liquid phase refrigerant Ri reaches a predetermined sensing level. When the storage level of the liquid-phase refrigerant Ri does not reach the predetermined sensing level, the high-temperature detection signal is connected to the controller Cnt so that the switch 3 of the electric heater 1 is turned on and off. , Evaporator Ev
Paying attention to the fact that the temperature of the refrigerant inside is substantially constant, although not shown, the temperature range of the refrigerant inside the evaporator Ev is input to the controller Cnt in advance as a set temperature range and detected by the heat generation type temperature sensor. Input temperature data to the controller Cnt, and compare the temperature data with the set temperature range. When the temperature data is within the set temperature range, the liquid phase having a temperature substantially the same as the refrigerant temperature in the evaporator Ev. It is determined that the storage level of the refrigerant Ri has reached a predetermined sensing level, and if the temperature data exceeds the set temperature range, it is determined that the storage level of the liquid phase refrigerant Ri is below the predetermined sensing level. Alternatively, the switch 3 of the electric heater 1 may be controlled to be turned on / off. Other configurations are similar to those of the first or second embodiment.

[Fourth Embodiment] FIG. 4 shows an accumulator A.
Another embodiment of the heating means 1 for heating the inside of cc is shown, and the outside air O
The heating fan 1 is provided as a heating means for heating the inside of the accumulator Acc by blowing relatively high temperature air discharged from A or the electric wiring box onto the outer surface of the bottom wall of the accumulator Acc. The switch 3 of the fan 1 is turned on / off by a signal from the controller Cnt to switch between a heating state in which the rotation of the heating fan 1 heats up and a heating stop state in which the rotation of the heating fan 1 is stopped to stop heating. .

In this embodiment, in order to enhance the heat transfer effect to the liquid phase refrigerant Ri, the heat transfer material 5 is fixed to the inner surface of the accumulator Acc and the heat transfer fins 6 are provided on the outer surface of the wall of the accumulator Acc. However, the heat transfer material 5 and the heat transfer fins 6 may be omitted. A heat pipe may be used as the heat transfer material 5.

In this embodiment, the other structure is similar to that of the first embodiment, but the same control means as in the second or third embodiment may be provided for implementation.

[Fifth Embodiment] The heat source of the heating means shown in the first, second, third and fourth embodiments is a heat source different from the refrigerant circulating in the heat pump circuit. The Example of the heating means 1 which heats the inside of the accumulator Acc using the refrigerant | coolant which circulates through a heat pump circuit as a heat source is shown, and a part of low-pressure vapor-phase refrigerant | coolant led out from the evaporator Ev is divided | segmented from the 1st low-pressure vapor-phase refrigerant path RL1. The first to flow and introduce into the auxiliary evaporator 7
Introduction path R1 and solenoid valve VD for opening and closing the first introduction path R1
And a second introduction path R2 for introducing the superheated refrigerant having a high degree of superheat derived from the auxiliary evaporator 7 into the accumulator Acc, and heating means for heating the inside of the accumulator Acc using the superheated refrigerant as a heat source. 1 is configured.

Then, the solenoid valve VD is opened / closed by a signal from the controller Cnt so that the overheated refrigerant accumulator Acc.
The inside of the accumulator Acc is heated to switch the heating state to the heating state, and the overheated refrigerant is stopped from being blown into the accumulator Acc to stop the heating.

The tip of the second introduction passage R2 has a first supply passage R2a for supplying superheated refrigerant to the top of the accumulator Acc and a second supply passage R2a for supplying superheated refrigerant to the bottom of the accumulator Acc. It is branched to the supply path R2b.

In this embodiment, the other constructions are the same as those in the first embodiment, but the same control means as those in the second or third embodiment may be provided for implementation.

[Sixth Embodiment] FIG. 6 shows another embodiment of the heating means 1 for heating the inside of the accumulator Acc by using the refrigerant circulating in the heat pump circuit as a heat source, and shows the high-pressure gas-phase refrigerant discharged from the compressor Cmp. High pressure gas phase refrigerant passage RH
A first introduction path R1 that is branched from the first introduction path R1 and introduced into the pressure reducing valve VR;
A solenoid valve VD that opens and closes the first introduction path R1 and a second introduction path R that introduces into the accumulator Acc the superheated refrigerant that has passed through the pressure reducing valve VR and has been decompressed and has increased in superheat degree.
2 is provided to configure heating means 1 for overheating the inside of the accumulator Acc using the overheated refrigerant as a heat source.

In this embodiment, the other structure is the same as that of the fifth embodiment, but the same control means as in the second or third embodiment may be provided for implementation.

[Other Embodiments] 1. As a heating means using the refrigerant circulating in the heat pump circuit as a heat source, a part of the high-pressure refrigerant having a relatively high temperature before and after passing through the condenser and the liquid-phase refrigerant in the accumulator are heat-exchanged to each other in the accumulator. May be heated. In this case, the high pressure refrigerant conduit may be passed through the accumulator, or the high pressure refrigerant conduit may be brought into contact with the outer peripheral surface of the accumulator. 2. The heating means may be manually switched between a heating state and a heating stop state. 3. The heat pump device according to the present invention is not limited to air conditioning applications such as cooling and heating, but can be applied to various applications in various fields dealing with cold heat and hot heat.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 Heat pump circuit diagram in cooling operation mode

FIG. 2 Heat pump circuit diagram in heating operation mode

FIG. 3 is a configuration diagram of a main part showing a second embodiment.

FIG. 4 is a configuration diagram of a main part showing a fourth embodiment.

FIG. 5 is a configuration diagram of a main part showing a fifth embodiment.

FIG. 6 is a configuration diagram of a main part showing a sixth embodiment.

[Explanation of symbols]

 1 Heating Means 2 Liquid Phase Refrigerant Detection Means Acc Accumulator Cmp Compressor Cnt Control Means

Claims (5)

[Claims] 1. A heat pump device provided with an accumulator (Acc) capable of separating a liquid phase refrigerant from a refrigerant introduced into a compressor (Cmp), wherein heating is performed to heat the inside of the accumulator (Acc). A heat pump device, wherein the means (1) is provided so as to be switchable between a heating state and a heating stop state. 2. A liquid-phase refrigerant detecting means (2) for detecting the liquid-phase refrigerant separated by the accumulator (Acc),
The heat pump according to claim 1, further comprising control means (Cnt) capable of switching the heating means (1) between a heating state and a heating stop state based on a detection result of the liquid phase refrigerant detecting means (2). apparatus. 3. The heating means (1) is switched to a heating state for a set time based on the detection result of a constant amount of the liquid phase refrigerant by the liquid phase refrigerant detecting means (2). Heat pump device. 4. The heat pump device according to claim 1, wherein the heat source of the heating means (1) is a refrigerant circulating in a heat pump circuit. 5. The heat source of the heating means (1) is a heat source different from the refrigerant circulating in the heat pump circuit.
The heat pump device according to 2 or 3.