JP2017075767A - Heat pump type heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat pump type heating device capable of suppressing temperature rise of electrical equipment at the time of defrosting operation in a normal cycle, and capable of securing heating capacity.SOLUTION: A heat pump type heating device includes a refrigerant circuit comprising: a compressor 10; a heat source side heat exchanger 11; a motor valve 12; and utilization side heat exchangers 16A, 16B. The heat pump type heating device performs: heating operation of making the utilization side heat exchanger 16A act as a condenser and the heat source side heat exchanger 11 act as an evaporator; and defrosting operation of, when frosting is detected on the heat source side heat exchanger 11, making opening of the motor valve 12 larger than that in the heating operation, and fluidizing refrigerant in the same direction as that in the heating operation to supply high-temperature refrigerant to the heat source side heat exchanger 11, thereby changing an upper limit current value or upper limit power value of the compressor 10 with the heating operation and the defrosting operation.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat pump heating device including a heat exchanger for hot water supply and a heat exchanger for heating.

  Conventionally, for example, Patent Document 1 describes an air conditioner that keeps the current value of a compressor constant during a defrosting operation in a reverse cycle in which a refrigerant flows in a direction opposite to that during normal operation. In this air conditioner, when the defrosting operation is performed at a current value near the upper limit value, there is a problem that the frequency of the compressor increases, the temperature of the electrical component rises, and the heat resistance temperature is exceeded. On the other hand, an air conditioner that performs a defrosting operation in a positive cycle in which the refrigerant flows in the same direction as in normal operation has also been proposed.

JP 2011-052849 A

  However, the operation time is longer in the forward cycle defrosting operation than in the reverse cycle defrosting operation. For this reason, if the defrosting operation is performed at the upper limit current value during the forward cycle defrosting operation, there is a problem that the temperature of the electrical component rises more than when the reverse cycle defrosting operation is employed. In order to prevent this, when the upper limit current value is lowered, the frequency is lowered during normal overheating operation and the heating capacity is lowered.

  Accordingly, the present invention has been made to solve the above-described problems, and provides a heat pump type heating device that can suppress a temperature rise of electrical components during a defrosting operation in a positive cycle and can secure a heating capacity. The purpose is to do.

A heat pump heating device according to a first invention includes a refrigerant circuit having a compressor, a heat source side heat exchanger, an electric valve, and a use side heat exchanger,
A heating operation in which the use side heat exchanger acts as a condenser and the heat source side heat exchanger as an evaporator; and
When the frost formation of the heat source side heat exchanger is detected, the opening degree of the motor-operated valve is made larger than that of the heating operation, and the refrigerant flows in the same direction as the heating operation to supply the high temperature refrigerant to the heat source side heat exchanger. And performing a defrosting operation,
The upper limit current value or the upper limit power value of the compressor is changed during the heating operation and the defrosting operation.

In this heat pump type heating device, the upper limit current value or upper limit power value of the compressor when performing the defrosting operation in the positive cycle in which the refrigerant flows in the same direction as in the heating operation is set as the upper limit current value or upper limit power value during the heating operation. Change from. Specifically, by lowering the upper limit current value or upper limit power value of the compressor during the defrosting operation from that during the heating operation, it is possible to reduce the frequency of the compressor and suppress the temperature rise of the electrical components. Moreover, since the upper limit electric current value at the time of a heating operation is maintained high, a heating capability can be ensured.

  When the current value of the compressor during the defrosting operation is equal to or higher than the upper limit current value, the heat pump heating device according to the second aspect of the invention reduces the frequency of the compressor until the current value becomes less than the upper limit current value.

  In this heat pump type heating device, when the current value is equal to or higher than the upper limit current value, the frequency of the compressor is decreased until the current value becomes less than the upper limit current value. Thereby, the temperature rise of an electrical component can be suppressed.

  The heat pump heating device according to a third aspect of the invention repeats decreasing the frequency of the compressor by a predetermined value until the current value of the compressor becomes less than the upper limit current value.

  In this heat pump type heating device, the frequency of the compressor can be surely lowered until it becomes less than the upper limit current value.

In 1st invention, the upper limit electric current value or upper limit electric power value of the compressor at the time of defrosting operation by the forward cycle which flows a refrigerant | coolant to the same direction as the heating operation is calculated from the upper limit electric current value or upper limit electric power value at the time of heating operation. change. Specifically, by lowering the upper limit current value or upper limit power value of the compressor during the defrosting operation from that during the heating operation, it is possible to reduce the frequency of the compressor and suppress the temperature rise of the electrical components. Moreover, since the upper limit electric current value at the time of a heating operation is maintained high, a heating capability can be ensured.

  In 2nd invention, when a current value is more than an upper limit electric current value, the frequency of a compressor is reduced until it becomes less than an upper limit electric current value. Thereby, the temperature rise of an electrical component can be suppressed.

  In the third aspect of the invention, the frequency of the compressor can be reliably reduced until it becomes less than the upper limit current value.

It is a block diagram which shows the outdoor unit of 1st Embodiment of this invention. It is a front view of the outdoor unit of FIG. FIG. 3A is a partial cutaway view illustrating the internal configuration of the heat pump unit and the water unit when the outdoor unit is viewed from the front, and FIG. 3B is the water when the outdoor unit is viewed from above. FIG. 3C is a partial cutaway view for explaining the internal configuration of the unit, and FIG. 3C is a partial cutaway view for explaining the arrangement of the hot water supply water pipe connection portion and the heating water pipe connection portion when the outdoor unit is viewed from the right side surface. is there. 4 (a) and 4 (b) are a perspective view and a side view of a hot water supply heat exchanger and a heating heat exchanger, respectively. The block diagram of the control part which carries out protection control of the compressor. The flowchart which carries out protection control of the compressor. (A) is a graph which shows the electric current value detected by the electric current detection sensor, (b) is a graph which shows the frequency of the compressor drooped by protection control being performed.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  As shown in FIGS. 1 and 2, the heat pump heating device (outdoor unit) 1 includes a heat pump unit 2 and a water unit unit 3 disposed above the heat pump unit 2. The heat pump unit 2 accommodates a compressor 10, an outdoor heat exchanger (heat source side heat exchanger) 11, an electric valve 12, and an outdoor fan 13. The water unit 3 accommodates a hot water supply heat exchanger (use side first heat exchanger) 16A, a heating heat exchanger (use side second heat exchanger) 16B, and a water supply pump 17. . In the heating operation of the outdoor unit 1, either one of hot water for hot water supply or hot water for heating can be heated.

  Inside the outdoor unit 1, a refrigerant circuit (heat pump) in which refrigerant circulates is configured. This refrigerant circuit has a main flow path 23, a first flow path 24, a second flow path 25, and a low pressure flow path 26.

  In the main flow path 23, the compressor 10, the outdoor heat exchanger 11, and the motor operated valve 12 are provided in order. On the discharge side of the compressor 10 disposed on one end side of the outdoor heat exchanger 11, a four-way switching valve 18 described later is disposed. One end of the outdoor heat exchanger 11 is connected to the suction side of the compressor 10, and one end of the motor-operated valve 12 is connected to the other end of the outdoor heat exchanger 11. Further, the compressor 10 is provided with a current detection sensor 40 that detects an input current of the compressor 10. The outdoor heat exchanger 11 is provided with a temperature sensor 43 that detects the temperature of the outdoor heat exchanger 11.

  The compressor 10 is inverter-controlled by a substrate of an electrical component 50 described later. The electrical component 50 includes a converter (not shown) that converts an AC voltage supplied from an AC power source into a DC voltage, and an inverter that drives the compressor 10 by converting the DC voltage converted by the converter into an AC voltage (see FIG. (For example, a circuit described in JP-A-2004-116920). The current detection sensor 40 detects an input current value (DC current value) to the inverter, and calculates an input current value (AC current value) of the converter based on this value. As the current value of the compressor 10, an input current value (DC current value) to the inverter may be used, or this calculated AC current value may be used. Alternatively, the current detection sensor 40 may be configured to directly detect the input current value (AC current value) of the converter, and the detected value may be used, or the input current value of the inverter calculated based on the detected value (DC current value) may be used.

  The first flow path 24 and the second flow path 25 branch at the four-way switching valve 18 disposed on the discharge side of the compressor 10, and in the junction 19 disposed on the other end side of the outdoor heat exchanger 11. Join. A service port 41 communicating with the refrigerant circuit is disposed between the junction 19 of the main flow path 23 and the motor operated valve 12. The service port 41 is used, for example, for injecting refrigerant from the outside into the refrigerant circuit during maintenance or discharging the refrigerant from the refrigerant circuit to the outside.

  During the heating operation, the first flow path 24 connects the four-way switching valve 18 provided on the downstream side of the compressor 10 in the main flow path 23 and the merging portion 19 provided on the upstream side of the motor operated valve 12. The first flow path 24 is provided with a hot water supply heat exchanger 16A, and a first check valve 44 disposed between the hot water supply heat exchanger 16A and the merging portion 19. The first check valve 44 allows the flow of the refrigerant from the hot water supply heat exchanger 16A to the merging portion 19, but the refrigerant flows from the merging portion 19 to the hot water supply heat exchanger 16A (first flow path 24). Shut off.

  The second flow path 25 connects the four-way switching valve 18 and the junction 19 in parallel with the first flow path 24. The second flow path 25 is provided with a heating heat exchanger 16B, a receiver 46, and a second check valve 48. The second check valve 48 allows the refrigerant to flow from the heating heat exchanger 16B to the merging section 19, but the refrigerant flows from the merging section 19 to the heating heat exchanger 16B (second flow path 25). Shut off.

  The receiver 46 is a container for storing a refrigerant. Of the first channel 24 and the second channel 25, the heating heat exchanger 16 </ b> B and the second check valve 48 in the second channel 25 having a small refrigerant capacity. It is provided in between.

  The second check valve 48 is disposed between the heating heat exchanger 16B and the merging portion 19 (downstream of the heating heat exchanger 16B and upstream of the merging portion 19).

  The low-pressure channel 26 connects the four-way switching valve 18 and the suction side of the compressor 10. The suction side of the compressor 10 refers to between the motor-operated valve 12 and the compressor 10, but the low-pressure flow path 26 is particularly connected between the compressor 10 and the outdoor heat exchanger 11.

  The hot water supply pump 17 supplies the hot water for hot water flowing out of the hot water supply tank 5 to the hot water supply heat exchanger 16 </ b> A and circulates the hot water for hot water supplied to the hot water supply tank 5.

  In the refrigerant circuit described above, the four-way switching is performed so that the refrigerant discharged from the compressor 10 flows in one of the first flow path 24 and the second flow path 25 and does not flow in the other flow path. The valve 18 is switched between a first state and a second state described later.

  In the first state, the refrigerant discharged from the compressor 10 flows to the first flow path 24 and does not flow to the second flow path 25, and the second flow path 25 is connected to the low pressure side of the main flow path 23. Specifically, regarding the hot water supply heat exchanger 16A through which the refrigerant flows, the discharge side of the compressor 10 is connected to the refrigerant inlet of the first flow path 24 via the four-way switching valve 18. An electric valve 12 is connected to the refrigerant outlet. Regarding the second flow path 25 through which the refrigerant does not flow, one end is connected to the low pressure flow path 26 via the four-way switching valve 18, and the other end is connected to the junction 19.

  In the first state, as shown by a solid line in FIG. 1, the refrigerant discharged from the compressor 10 flows into the first flow path 24 via the four-way switching valve 18. And after exchanging heat with water in the hot water heat exchanger 16 </ b> A, the electric valve 12 is reached via the junction 19. On the other hand, the refrigerant in the second flow path 25 flows into the low pressure flow path 26 via the four-way switching valve 18 and is sucked into the compressor 10. However, after the refrigerant in the second flow path 25 is sucked into the compressor 10, there is the second check valve 48, so that the refrigerant on the merging portion side 19 from the second check valve 48 is sucked into the compressor 10. It will never be done.

  In the second state, the refrigerant discharged from the compressor 10 flows into the second flow path 25 and does not flow into the first flow path 24, and the first flow path 24 is connected to the low pressure side of the main flow path 23. Specifically, with respect to the heating heat exchanger 16B through which the refrigerant flows, the refrigerant inlet of the second flow path 25 is connected to the discharge side of the compressor 10 via the four-way switching valve 18, and the second flow path 25 An electric valve 12 is connected to the refrigerant outlet. Regarding the first flow path 24 through which the refrigerant does not flow, one end is connected to the low pressure flow path 26 via the four-way switching valve 18, and the other end is connected to the junction 19.

  In the second state, as shown by the dotted line in FIG. 1, the refrigerant discharged from the compressor 10 flows into the second flow path 25 via the four-way switching valve 18. And after exchanging heat with water with the heat exchanger 16B for heating, it arrives at the motor operated valve 12 through the junction part 19. FIG. On the other hand, the refrigerant in the first flow path 24 flows into the low pressure flow path 26 via the four-way switching valve 18 and is sucked into the compressor 10. However, after the refrigerant in the first flow path 24 is sucked into the compressor 10, the first check valve 44 is provided, so that the refrigerant on the merging portion side 19 from the first check valve 44 is sucked into the compressor 10. It will never be done.

  The water unit 3 has a hot water supply water pipe connection part 20 and a heating water pipe connection part 21. The hot water supply water pipe connection portion 20 has an outward connection portion 20a and a return connection portion 20b, and the heating water pipe connection portion 21 has an outward connection portion 21a and a return connection portion 21b.

  Inside the water unit 3, the forward connection 20a of the hot water supply water pipe connection 20 is connected to the water outlet of the hot water supply heat exchanger 16A in the first state, and the return connection 20b of the hot water supply water pipe connection 20 is The hot water supply heat exchanger 16A is connected to the water inlet.

  In the hot water supply heat exchanger 16A, between the refrigerant flowing in from the four-way switching valve 18 on the discharge side of the compressor 10 and the hot water supply hot water flowing in from the return connection portion 20b of the hot water supply water pipe connection portion 20 in the first state. As a result of the heat exchange, the hot water for hot water supply is heated, and the heated hot water for hot water supply flows out toward the forward connection portion 20 a of the hot water supply water pipe connection portion 20.

  Inside the water unit 3, the forward connection 21 a of the heating water pipe connection 21 is connected to the water outlet of the heating heat exchanger 16 B in the second state, and the return connection 21 b of the heating water pipe connection 21 is , Connected to the water inlet of the heat exchanger 16B for heating.

  In the heating heat exchanger 16B, in the second state, between the refrigerant that has flowed in from the four-way switching valve 18 on the discharge side of the compressor 10 and the hot water for heating that has flowed in from the return connection portion 21b of the heating water pipe connection portion 21. The hot water for heating is heated by the heat exchange at, and the heated hot water flows out toward the forward connection portion 21a of the heating water pipe connection portion 21.

  The outdoor unit 1 of the present embodiment is connected to the use side device 4. The use side device 4 includes a hot water supply tank 5, a gas boiler 6, a floor heating panel 7, and a pump 8. The gas boiler 6 has a heater 6 a and is connected to a floor heating panel 7 and a hot water supply terminal 9. Accordingly, the gas boiler 6 heats the hot water for hot water supplied from the hot water tank 5 before being supplied to the hot water supply terminal 9 or before the hot water for heating supplied from the outdoor unit 1 is supplied to the floor heating panel 7. Can be heated. The pump 8 supplies the heating hot water flowing out from the floor heating panel 7 to the heating heat exchanger 16 </ b> B, and circulates the heating hot water supplied to the floor heating panel 7.

  Fig.3 (a) is a partial fracture | rupture figure explaining the internal structure of the heat pump part 2 and the water unit part 3 when the outdoor unit 1 is seen from the front, FIG.3 (b) shows the outdoor unit 1 from upper direction. FIG. 3C is a partial cutaway view illustrating the internal configuration of the water unit section 3 when viewed, and FIG. 3C is a hot water supply water pipe connection section 20 and a heating water pipe connection section when the outdoor unit 1 is viewed from the right side surface. FIG. As shown in FIG. 3A, the four-way switching valve 18 is disposed in the heat pump unit 2. An electrical component 50 is disposed in the heat pump unit 2. The electrical component 50 includes a control board that controls the compressor 10, the motor operated valve 12, the outdoor fan 13, the four-way switching valve 18, and the like.

  FIG. 4A and FIG. 4B are a perspective view and a side view of a hot water supply heat exchanger 16A and a heating heat exchanger 16B, respectively. Inside the water unit 3 of the outdoor unit 1, the hot water supply heat exchanger 16A and the heating heat exchanger 16B are arranged in a vertically stacked state, as shown in FIG.

  The heating heat exchanger 16B has a heating water pipe 32 wound so as to be stacked in two stages in the vertical direction, and the hot water heat exchanger 16A is stacked in two stages in the vertical direction. It has the hot water supply water piping 31 wound like this. The hot water supply water pipe 31 and the heating water pipe 32 are wound in a substantially spiral shape at each stage in a plan view.

  A hot water supply return connection pipe 31a extending from the water supply pump 17 (return connection part 20b of the hot water supply water pipe connection part 20) is connected to the water inlet of the hot water supply heat exchanger 16A, and the water flow of the hot water supply heat exchanger 16A is Connected to the outlet is a hot water supply connection pipe 31 b extending from the forward connection part 20 a of the hot water supply water pipe connection part 20. A heating return communication pipe 32a extending from the return connection part 21b of the heating water pipe connection part 21 is connected to the water inlet of the heating heat exchanger 16B, and the water outlet of the heating heat exchanger 16B is connected to the water outlet of the heating heat exchanger 16B. The heating outgoing communication pipe 32b extending from the outgoing connecting part 21a of the heating water pipe connecting part 21 is connected.

  In the hot water supply heat exchanger 16A, a hot water supply refrigerant pipe 33 is spirally wound around the outer periphery of the hot water supply water pipe 31, and in the heating heat exchanger 16B, a heating refrigerant is provided around the outer periphery of the heating water pipe 32. The pipe 34 is wound spirally. The hot water supply heat exchanger 16A has a refrigerant inlet connected to a hot water supply connection pipe 33a extending from the discharge-side branching portion 18 of the compressor 10, and a hot water supply heat exchanger 16A has an electric outlet connected to the refrigerant outlet. A hot water supply connecting pipe 33b extending from the valve 12 is connected. Further, a heating communication pipe 34a extending from the branch portion 18 on the discharge side of the compressor 10 is connected to the refrigerant inlet of the heating heat exchanger 16B, and the refrigerant outlet of the heating heat exchanger 16B is connected to the refrigerant inlet of the heating heat exchanger 16B. The heating communication pipe 34b extending from the motor-operated valve 12 is connected.

  In the present embodiment, the hot water supply heat exchanger 16A is a portion in which the hot water supply refrigerant pipe 33 is spirally wound around the outer periphery of the hot water supply water pipe 31, and the heating heat exchanger 16B is the outer periphery of the heating water pipe 32. It is assumed that the heating refrigerant pipe 34 is spirally wound.

  The hot water supply water pipe 31 of the hot water supply heat exchanger 16A is wound so as to be stacked in two stages in the vertical direction, and is located at a lower stage from the hot water return communication pipe 31a. Hot water for hot water supply flows into the pipe, and hot water for hot water supply flows out from the pipe located at the upper stage to the hot water supply connecting pipe 31b. The heating water pipe 32 of the heating heat exchanger 16B is wound so as to be stacked in two stages in the vertical direction, and is in a stage disposed on the lower side from the heating return communication pipe 32a. The warm water for heating flows into the pipe, and the warm water for heating flows out from the pipe located at the upper stage to the forward communication pipe 32b for heating.

  The hot water supply water pipe 31 of the hot water supply heat exchanger 16 </ b> A configured as described above and the heating water pipe 32 of the heating heat exchanger 16 </ b> B are stacked inside the water unit 3. Specifically, the hot water supply heat exchanger 16A is wound so as to be stacked in two stages, and is configured such that hot water for hot water supply flows out from a pipe (outer pipe) in the uppermost stage. The heating heat exchanger 16B is stacked above the hot water supply heat exchanger 16A (for hot water supply so as to be close to the pipe (outer pipe) at the uppermost stage in the hot water supply water pipe 31). (It is laminated on the heat exchanger 16A.)

  A water communication pipe (a hot water supply return communication pipe 31a and a hot water supply forward communication pipe 31b) and a refrigerant communication pipe (a hot water supply communication pipe 33a and a hot water supply communication pipe 33b) are connected to the hot water supply heat exchanger 16A. The heating heat exchanger 16B is connected to a water communication pipe (heating return communication pipe 32a and heating outgoing communication pipe 32b) and a refrigerant communication pipe (heating communication pipe 34a and heating communication pipe 34b). Has been.

  As shown in FIG. 5, the control unit 56 is connected to the current detection sensor 40 and the temperature sensor 43 on the input side. The output side of the control unit 56 is connected to the compressor 10 and the motor operated valve 12.

  In the heat pump heating device 1 having the above configuration, a heating operation and a normal cycle defrosting operation are performed. In the heating operation, the hot water supply heat exchanger 16A and the heating heat exchanger 16B act as a condenser, and the outdoor heat exchanger 11 acts as an evaporator. In the normal cycle defrosting operation, when frost formation of the outdoor heat exchanger 11 is detected, the opening degree of the motor-operated valve 12 is made larger than that of the heating operation, and the refrigerant flows in the same direction as the heating operation to cause the outdoor heat exchanger 11 to flow. To supply high-temperature refrigerant.

  During the forward cycle defrosting operation, the compressor 10 is operated while the four-way switching valve 18 is maintained in the first state or the second state. In the forward cycle defrosting operation, the refrigerant flows in the refrigerant circuit in the same direction as in the heating operation, and therefore it is possible to perform the defrosting without stopping the compressor 10.

  In the normal cycle defrosting operation, the compressor 10 is operated at a predetermined frequency, preferably the maximum frequency. Thus, it becomes easy to ensure the calorie | heat amount for a defrost because the compressor 10 is drive | operated by the largest possible frequency. Further, during the forward cycle defrosting operation, the driving of the outdoor fan 13 is stopped.

  Although the electrical component 50 is cooled by the ventilation from the outdoor fan 13, the outdoor fan 13 stops during the defrosting operation, so that the cooling means is lost. For this reason, when the defrosting operation is performed for a long time at a high current value, the temperature of the electrical component 50 becomes high. Also, the forward cycle defrosting operation requires a longer defrosting operation at a higher current value than the reverse cycle defrosting operation (reversing the heating and cooling modes) generally performed in, for example, room air conditioners. Become.

  FIG. 6 shows a flowchart in which the normal cycle defrosting operation of the present invention is executed. FIG. 7A shows the current value of the compressor 10 detected by the current detection sensor 40. FIG. 7B shows the frequency of the compressor 10. In FIG. 7A, A1 represents the upper limit current value during the heating operation, and A2 represents the upper limit current value during the positive cycle defrosting operation.

  As shown in FIG. 6, the control unit 56 starts the heating operation in step S1. In step S <b> 2, the control unit 56 determines whether or not the temperature of the outdoor heat exchanger 11 detected by the temperature sensor 43 is equal to or lower than the first threshold value. The first threshold is, for example, −5 degrees, but is not limited to this. If it is below the first threshold, it is determined that the outdoor heat exchanger 11 has frosted, and the process proceeds to step S3. If it is greater than the first threshold, step S2 is repeated.

  In step S <b> 3, the control unit 56 decreases the upper limit current value of the compressor 10. Specifically, the upper limit current value, which was, for example, 14.25 amperes during the heating operation is lowered to 12.5 amperes. Thereby, when the current value is low such as at the start of the defrosting operation, the defrosting operation can be executed at an arbitrary frequency without worrying about the upper limit current value. On the other hand, when the current value is high, such as before the end of the defrosting operation, the frequency of the compressor can be lowered until the current value becomes less than the upper limit current value, as will be described later, and the temperature rise of the electrical component 50 can be suppressed. In addition, the specific numerical value of the upper limit current value is not particularly limited, and the upper limit current value may be either a DC current value or an AC current value.

  In step S4, the control unit 56 switches from the heating operation to the normal cycle defrosting operation. In the normal cycle defrosting operation, the compressor 10 is driven at the maximum frequency, the valve opening of the motor operated valve 12 is increased, and the driving of the outdoor fan 13 is stopped.

  In step S5, the control unit 56 determines whether or not the current value of the compressor 10 detected by the current detection sensor 40 is equal to or higher than the upper limit current value. If it is less than the upper limit current value as shown at time t1 in FIG. 7A, the process proceeds to step S6. As shown at time t2 in FIG. 7A, the electrical component 50 may become hot if it is equal to or greater than the upper limit current value, and thus the process proceeds to step S7. In step S7, the control unit 56 lowers the frequency of the compressor 10 by a predetermined value (see time t2 in FIG. 7B), so that the current value also decreases and returns to step S5. Here, the predetermined value is, for example, 2 Hz, but is not limited thereto. As described above, when the value is equal to or higher than the upper limit current value, the frequency of the compressor 10 is decreased by a predetermined value until the frequency becomes less than the upper limit current value (see time t3 in FIG. 7A).

  In step S6, the control unit 56 determines whether or not the temperature of the outdoor heat exchanger 11 is equal to or higher than the second threshold value. The second threshold is, for example, 7 degrees, but is not limited to this. If it is more than a 2nd threshold value, it will judge that the frost adhering to the outdoor heat exchanger 11 was fuse | melted, and will complete | finish a defrost operation. If it is less than the second threshold value, the process returns to step S5 and the defrosting operation is continued.

[Characteristics of the heat pump type heating apparatus of this embodiment]
The heat pump type heating device of the present embodiment has the following features.

  In the heat pump type heating device 1 of the present invention, the upper limit current value of the compressor 10 at the time of performing the defrosting operation in the forward cycle in which the refrigerant flows in the same direction as that during the heating operation is changed from the upper limit current value during the heating operation. Specifically, by lowering the upper limit current value of the compressor 10 during the defrosting operation from that during the heating operation, the frequency of the compressor 10 can be lowered and the temperature rise of the electrical component 50 can be suppressed. Moreover, since the upper limit electric current value at the time of a heating operation is maintained high, a heating capability can be ensured.

  In the heat pump type heating apparatus 1 of the present invention, when the current value is equal to or higher than the upper limit current value, the frequency of the compressor 10 is decreased until the current value becomes less than the upper limit current value. Thereby, the temperature rise of the electrical component 50 can be suppressed.

  In the heat pump type heating device 1 of the present invention, the frequency of the compressor 10 can be reliably lowered until it becomes less than the upper limit current value.

  In the heat pump type heating apparatus 1 of the present invention, AC current and DC current are converted, and any one of the upper limit current values may be changed, so that the degree of freedom in design can be increased.

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is shown not only by the above description of the embodiments but also by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  In the embodiment, frost formation on the outdoor heat exchanger 11 is detected based on the temperature of the outdoor heat exchanger 11 detected by the temperature sensor 43. However, the method for detecting frost formation is not particularly limited.

  In the embodiment, the upper limit current value of the compressor 10 is changed, but the same effect can be obtained even if the upper limit power value is changed.

DESCRIPTION OF SYMBOLS 1 Heat pump type heating apparatus 10 Compressor 11 Outdoor heat exchanger (heat source side heat exchanger)
12 Motorized valve 16A Hot water supply heat exchanger (user side first heat exchanger)
16B Heat exchanger for heating (second heat exchanger on the use side)

Claims (3)

A refrigerant circuit having a compressor, a heat source side heat exchanger, an electric valve, and a use side heat exchanger;
A heating operation in which the use side heat exchanger acts as a condenser and the heat source side heat exchanger as an evaporator; and
When the frost formation of the heat source side heat exchanger is detected, the opening degree of the motor-operated valve is made larger than that of the heating operation, and the refrigerant flows in the same direction as the heating operation to supply the high temperature refrigerant to the heat source side heat exchanger. And performing a defrosting operation,
The heat pump type heating apparatus, wherein an upper limit current value or an upper limit power value of the compressor is changed between the heating operation and the defrosting operation.   2. The heat pump heating device according to claim 1, wherein when the current value of the compressor during the defrosting operation is equal to or higher than an upper limit current value, the frequency of the compressor is decreased until the current value becomes less than the upper limit current value. .   The heat pump heating device according to claim 2, wherein the frequency of the compressor is decreased by a predetermined value until the current value of the compressor becomes less than an upper limit current value.

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