JPWO2020235043A1 - Heat pump device - Google Patents

Abstract

In the heat pump device, the operation control in the transient state is appropriately switched to the operation control in the steady state.
The heat pump device 1 according to the present invention is a refrigerant pipe 6 for connecting a compressor 2 for compressing a refrigerant, a pressure reducing device 3 for reducing the pressure of the refrigerant, the compressor 2 and the pressure reducing device 3, and a refrigerant pipe 6 for circulating the refrigerant. The first heat exchanger 4 that exchanges heat between the refrigerant and air in 6, the second heat exchanger 5 that exchanges heat between the refrigerant and heat medium in the refrigerant pipe 6, and the refrigerant pipe 6 The temperature of the refrigerant in the refrigerant pipe 6 is transient using the heat insulating material 16 that covers a part of the heat insulating material 16, the heat insulating material temperature sensor 56 that detects the temperature of the heat insulating material 16, and the temperature detected by the heat insulating material temperature sensor 56. The control unit 22 is provided to switch from the operation control in the transient state changing to the operation control in the steady state in which the temperature of the refrigerant in the refrigerant pipe 6 is constant.

Description

The present invention relates to a heat pump device.

As a conventional heat pump device, there is a compressor, a decompression device, a refrigerant pipe connecting them, and a discharge temperature detecting means for detecting the discharge temperature of the refrigerant in the compressor (for example, Patent Document 1). reference). In this heat pump device, in hot water supply operation, a state in which the discharge temperature of the refrigerant is transiently rising is determined to be a transient state, a state in which it is steady is determined to be a steady state, and when it is determined to be a steady state, it is in a transient state. By switching from the operation control to the operation control in the steady state, the operation efficiency is improved.

Japanese Unexamined Patent Publication No. 2000-346449

However, in the above technique, even if the discharge temperature of the refrigerant in the compressor becomes a steady state, the entire temperature of the refrigerant in the refrigerant pipe may not be in a steady state, and a transient state in this state. When switching from the operation control in the above to the operation control in the steady state, there is a problem that the operation efficiency is lowered.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to appropriately switch from operation control in a transient state to operation control in a steady state.

The heat pump device according to the present invention includes a compressor that compresses the refrigerant, a decompression device that depressurizes the refrigerant, a refrigerant pipe that connects the compressor and the decompression device to circulate the refrigerant, and refrigerant and air in the refrigerant pipe. A first heat exchanger that exchanges heat between the two, a second heat exchanger that exchanges heat between the refrigerant and the heat medium in the refrigerant pipe, a cover member that covers a part of the refrigerant pipe, and a cover member. Using the cover member temperature sensor that detects the temperature of the It is provided with a control unit that switches to operation control in a steady state in which the temperature is constant.

Further, the heat pump device according to the present invention includes a compressor that compresses the refrigerant, a decompression device that depressurizes the refrigerant, a refrigerant pipe that connects the compressor and the decompression device to circulate the refrigerant, and a refrigerant in the refrigerant pipe. A first heat exchanger that exchanges heat with air, and a second heat exchanger that exchanges heat between the refrigerant in the refrigerant pipe and the hot water in the water pipe where the hot water in the hot water storage tank circulates. A refrigerant that uses a cover member that covers a part of the water pipe between the second heat exchanger and the hot water storage tank, a cover member temperature sensor that measures the temperature of the cover member, and a temperature detected by the cover member temperature sensor. It is provided with a control unit that switches from operation control in a transient state in which the temperature of the refrigerant in the pipe is transiently changed to operation control in a steady state in which the temperature of the refrigerant in the refrigerant pipe is constant.

According to the present invention, since the operation control in the transient state is switched to the operation control in the steady state by using the temperature of the cover member detected by the cover member temperature sensor, the operation control in the transient state is changed to the operation in the steady state. You can switch to control appropriately.

It is a figure which shows the heat pump hot water supply system provided with the heat pump device which concerns on Embodiment 1 of this invention. It is a front view which shows the internal structure of the heat pump apparatus which concerns on Embodiment 1 of this invention. FIG. 5 is an external perspective view of the heat pump device according to the first embodiment of the present invention as viewed from the front. It is an external perspective view of the heat pump device which concerns on Embodiment 1 of this invention as seen from the back. It is a figure which looked at the heat insulating material which concerns on Embodiment 1 of this invention from the top. FIG. 5 is a cross-sectional view of the heat insulating material according to the first embodiment of the present invention, and is a cross-sectional view taken along the line AA in FIG. It is a block diagram which shows the function of the control device which concerns on Embodiment 1 of this invention. It is a figure which shows the temperature change detected by the temperature sensor of the heat pump apparatus which concerns on Embodiment 1 of this invention, and the rotation speed change of a blower. It is a flowchart which shows the operation at the time of hot water storage operation of the control device which concerns on Embodiment 1 of this invention. It is sectional drawing of the heat insulating material of the 1st modification of Embodiment 1 of this invention, and is sectional drawing along line AA in FIG. It is sectional drawing of the heat insulating material of the 2nd modification of Embodiment 1 of this invention, and is sectional drawing along line AA in FIG. It is sectional drawing of the heat insulating material of the 3rd modification of Embodiment 1 of this invention, and is sectional drawing along line AA in FIG. It is a flowchart which shows the operation at the time of hot water storage operation of the control device which concerns on Embodiment 2 of this invention. It is a figure which shows the heat pump hot water supply system provided with the heat pump device which concerns on Embodiment 3 of this invention. It is a block diagram which shows the function of the control device which concerns on Embodiment 3 of this invention. It is a figure which shows the heat pump hot water supply system provided with the heat pump device which concerns on the modification of Embodiment 3 of this invention.

Hereinafter, embodiments will be described with reference to the drawings. Common or corresponding elements in the drawings are designated by the same reference numerals to simplify or omit duplicate description. The present invention may include any combination of configurable configurations among the configurations described in each of the following embodiments.

Embodiment 1.
FIG. 1 is a diagram showing a heat pump hot water supply system 100 including the heat pump device 1 of the first embodiment. FIG. 2 is a front view showing the internal structure of the heat pump device 1 of the first embodiment. FIG. 3 is an external perspective view of the heat pump device 1 of the first embodiment as viewed from the front. FIG. 4 is an external perspective view of the heat pump device 1 of the first embodiment as viewed from behind. For convenience of explanation, in the heat pump device 1 of FIG. 2, the upper side of the paper surface is "upper", the lower side of the paper surface is "lower", the right side of the paper surface is "right", the left side of the paper surface is "left", and the front side in the vertical direction of the paper surface is. The "front" and the back side in the vertical direction of the paper are defined as "back".

As shown in FIG. 1, the heat pump hot water supply system 100 of the first embodiment includes a heat pump device 1 and a hot water storage device 30. The heat pump device 1 heats a liquid heat medium by using a heat pump cycle, and is installed outdoors. In this embodiment, the heat medium is water. The heat pump device 1 heats water to generate hot water. The heat medium may be a liquid other than water, such as an aqueous solution of calcium chloride, an aqueous solution of ethylene glycol, an aqueous solution of propylene glycol, or alcohol. The heat pump device 1 includes a compressor 2, an expansion valve 3, an air-refrigerant heat exchanger 4, a water-refrigerant heat exchanger 5, and a refrigerant pipe 6.

As shown in FIGS. 2 to 4, the heat pump device 1 includes a housing 7 that forms an outer shell. The housing 7 includes a base 8, a front panel 9, a back panel 10, and a top panel 11. Each of these components of the housing 7 is made of, for example, a sheet metal material.

The base 8 has a bottom surface portion 8a forming the bottom surface of the housing 7, and a right side portion 8b extending vertically from the right side of the bottom surface portion 8a. The front panel 9 has a front surface portion 9a forming the front surface of the housing 7 and a left side surface portion 9b forming the left side surface of the housing 7. An exhaust port 9c for exhausting air is formed on the front surface portion 9a of the front panel 9. A grid 9d is attached to the exhaust port 9c. The back panel 10 has a rear surface portion 10a forming the rear surface of the housing 7 and a right side surface portion 10b forming the right side surface of the housing 7. A service panel 10c for protecting the terminal block 17a, the water inlet valve 19, and the hot water outlet valve 20, which will be described later, is attached to the right side surface portion 10b of the back panel 10. The top panel 11 forms the upper surface of the housing 7. The outer surface of the heat pump device 1 is covered with a housing 7 except for the air-refrigerant heat exchanger 4 arranged on the rear surface side.

FIG. 2 is a diagram showing a state in which the front panel 9 and the top panel 11 are removed. Further, in FIG. 2, some constituent devices are not shown. As shown in FIG. 2, a machine room 12 is formed on the right side and a blower room 13 is formed on the left side on the base 8. The machine room 12 and the blower room 13 are separated by a partition plate 14 extending in the vertical direction.

Refrigerant circuit parts such as a compressor 2 for compressing the refrigerant and an expansion valve 3 for reducing the pressure of the refrigerant (not shown in FIG. 2) are incorporated in the machine room 12. The compressor 2 and the expansion valve 3 are connected by a refrigerant pipe 6. The refrigerant pipe 6 is made of a metal material such as a copper material.

The compressor 2 includes a compression unit (not shown) and a motor (not shown). The compression unit performs a compression operation of the refrigerant. The motor drives the compression unit. The motor is driven by electric power supplied from the outside.

The expansion valve 3 adjusts the flow path opening degree of the refrigerant by energizing a coil (not shown) attached to the outer surface of the expansion valve 3 main body from the outside. The expansion valve 3 can adjust the pressure of the high-pressure refrigerant on the upstream side of the expansion valve 3 and the pressure of the low-pressure refrigerant on the downstream side of the expansion valve 3. The expansion valve 3 is an example of a pressure reducing device that reduces the pressure of the refrigerant.

The blower room 13 has a larger space than the machine room 12 in order to secure an air passage. A blower 15 is provided in the blower room 13. The blower 15 includes two to three propeller blades 15a and a motor (not shown) for rotationally driving the propeller blades 15a. The propeller blade 15a rotates as the motor rotates due to the electric power supplied from the outside.

On the rear surface side of the blower chamber 13, an air-refrigerant heat exchanger 4 as a first heat exchanger is installed facing the blower 15. The air-refrigerant heat exchanger 4 is formed by a large number of refrigerant pipes 6 in close contact with a large number of thin aluminum plate fins 4a and reciprocating several times. The air-refrigerant heat exchanger 4 has an L-shaped bend when viewed from above. The air-refrigerant heat exchanger 4 is installed from the rear surface to the left side surface of the heat pump device 1. The air-refrigerant heat exchanger 4 exchanges heat between the refrigerant in the refrigerant pipe 6 and the air around the fins 4a. The amount of heat exchange can be adjusted by adjusting the amount of air passing between the fins 4a by the blower 15. The air-refrigerant heat exchanger 4 is an example of an evaporator that evaporates the refrigerant.

A water-refrigerant heat exchanger 5 as a second heat exchanger is installed on the base 8 of the blower chamber 13. The water-refrigerant heat exchanger 5 is formed by bending and molding, for example, in a state where the refrigerant pipe 6 and the water pipe 40 described later are in close contact with each other. The water-refrigerant heat exchanger 5 exchanges heat between the refrigerant in the refrigerant pipe 6 and the heat medium in the water pipe 40, that is, water. Hot water is generated by heating the water in the water pipe 40 by the water-refrigerant heat exchanger 5. The water-refrigerant heat exchanger 5 is arranged below the blower 15.

The water-refrigerant heat exchanger 5 is covered with a heat insulating material 16 which is a cover member. The heat insulating material 16 covers at least a part of the water-refrigerant heat exchanger 5. By providing the heat insulating material 16 that covers the water-refrigerant heat exchanger 5, the amount of heat dissipated from the water-refrigerant heat exchanger 5 to the surrounding space can be reduced. The heat insulating material 16 has, for example, a rectangular parallelepiped shape. The heat insulating material 16 is made of foamed plastic such as polyurethane foam or polystyrene foam. The heat insulating material 16 may be made of another heat insulating material such as a vacuum heat insulating material or glass wool. Further, the heat insulating material 16 may be formed by combining a plurality of heat insulating materials. Further, the heat insulating material 16 may have a cylindrical shape, for example, instead of a rectangular parallelepiped shape. The heat insulating material 16 is stored in a metal storage container (not shown).

An electric component storage box 17 is installed in the upper part of the machine room 12. The electrical product storage box 17 is provided with a terminal block 17a for connecting external electrical wiring. Further, the electronic board 18 is stored in the electric product storage box 17. Electronic components and electrical components constituting a control module that controls the operation of each actuator such as a compressor 2, an expansion valve 3, a blower 15, and a water pump 34 are attached to the electronic substrate 18.

A water circuit component including a first internal pipe 31 and a second internal pipe 32 is incorporated in the machine room 12. Further, both are provided on the right side portion 8b of the base 8 so that the water inlet valve 19 is on the lower side and the hot water outlet valve 20 is on the upper side. The first internal pipe 31 connects the water inlet valve 19 and the water inlet of the water-refrigerant heat exchanger 5. The second internal pipe 32 connects the hot water outlet of the water-refrigerant heat exchanger 5 and the hot water outlet valve 20.

Next, the refrigerant circuit and the water circuit of the heat pump hot water supply system 100 will be described with reference to FIG. In FIG. 1, the flow of the refrigerant in the refrigerant circuit and the flow of water in the water circuit are indicated by arrows.

As shown in FIG. 1, in the heat pump device 1, the refrigerant inlet of the water-refrigerant heat exchanger 5 is connected to the discharge port of the compressor 2 via the refrigerant pipe 6. The refrigerant outlet of the water-refrigerant heat exchanger 5 is connected to the inlet of the expansion valve 3 via the refrigerant pipe 6. The outlet of the expansion valve 3 is connected to the refrigerant inlet of the air-refrigerant heat exchanger 4 via the refrigerant pipe 6. The refrigerant outlet of the air-refrigerant heat exchanger 4 is connected to the suction port of the compressor 2 via the refrigerant pipe 6. In this way, the compressor 2 and the expansion valve 3 are connected by the refrigerant pipe 6, so that a refrigerant circuit in which the refrigerant circulates is formed. For example, a CO ₂ refrigerant is sealed in the refrigerant circuit.

The hot water storage device 30 includes, for example, a hot water storage tank 33 having a capacity of about several hundred liters, and a water pump 34 for sending hot water in the hot water storage tank 33 to the heat pump device 1. The heat pump device 1 and the hot water storage device 30 are connected via a first external pipe 35, a second external pipe 36, and electrical wiring (not shown).

An outgoing pipe 37 is connected to the lower part of the hot water storage tank 33. A return pipe 38 is connected to the upper part of the hot water storage tank 33. The first external pipe 35 connects the outgoing pipe 37 and the water inlet valve 19 of the heat pump device 1. The second external pipe 36 connects the hot water outlet valve 20 of the heat pump device 1 and the return pipe 38. The water pump 34 is provided, for example, in the forward pipe 37. Water-refrigerator connecting the first internal pipe 31, the second internal pipe 32, the first external pipe 35, the second external pipe 36, the forward pipe 37, the return pipe 38, and the first internal pipe 31 and the second internal pipe 32. A water circuit for circulating hot water in the hot water storage tank 33 is formed in the water pipe 40 such as the heat exchanger water pipe 39 in the heat exchanger 5.

The hot water storage device 30 further includes a mixing valve 41. The mixing valve 41 includes a first hot water supply pipe 42 branched from a return pipe 38, a first water supply pipe 43 through which water supplied from a water source such as a water supply passes, and a second hot water supply pipe 44 through which hot water supplied to a user passes. Is connected. The mixing valve 41 adjusts the temperature of the hot water supplied to the user by adjusting the mixing ratio of the high temperature water flowing in from the first hot water supply pipe 42 and the low temperature water flowing in from the first hot water supply pipe 43. The hot water mixed by the mixing valve 41 is sent to a user terminal such as a bathtub, a shower, a faucet, or a dishwasher through a second hot water supply pipe 44. A second water supply pipe 45 branched from the first water supply pipe 43 is connected to the lower part of the hot water storage tank 33. Low temperature water flows into the lower part of the hot water storage tank 33 from the second water supply pipe 45.

Further, a plurality of temperature sensors 51 to 56 are attached to the heat pump device 1. The first temperature sensor 51 is attached to the refrigerant pipe 6 between the compressor 2 and the water-refrigerant heat exchanger 5, and detects the temperature of the refrigerant discharged from the compressor 2. The second temperature sensor 52 is attached to the refrigerant pipe 6 between the air-refrigerant heat exchanger 4 and the compressor 2, and detects the temperature of the refrigerant after passing through the air-refrigerant heat exchanger 4. The third temperature sensor 53 is attached to the outside of the air-refrigerant heat exchanger 4 and detects the outside air temperature. The third temperature sensor 53 may be attached to a portion other than the air-refrigerant heat exchanger 4, such as the outer surface of the housing 7, as long as it can detect the outside air temperature. The fourth temperature sensor 54 is attached to the first internal pipe 31 and detects the temperature of the water flowing into the water-refrigerant heat exchanger 5. The fifth temperature sensor 55 is attached to the second internal pipe 32 and detects the temperature of hot water after passing through the water-refrigerant heat exchanger 5. The heat insulating material temperature sensor 56 is attached to the heat insulating material 16 and detects the temperature of the heat insulating material 16. The heat insulating material temperature sensor 56 corresponds to the cover member temperature sensor.

Next, the structure of the heat insulating material 16 will be described with reference to FIGS. 5 and 6. FIG. 5 is a top view of the heat insulating material 16 of the first embodiment. FIG. 6 is a cross-sectional view of the heat insulating material 16 of the first embodiment, and is a cross-sectional view taken along the line AA in FIG.

As shown in FIGS. 5 and 6, the heat insulating material 16 includes an upper surface wall portion 16a forming the upper surface of the heat insulating material 16, a lower surface wall portion 16b forming the lower surface of the heat insulating material 16, and a front surface forming the front surface of the heat insulating material 16. It has a wall portion 16c, a rear surface wall portion 16d forming the rear surface of the heat insulating material 16, a right surface wall portion 16e forming the right surface of the heat insulating material 16, and a left surface wall portion 16f forming the left surface of the heat insulating material 16. The heat insulating material covers the water-refrigerant heat exchanger 5 by these wall portions 16a to 16f.

Further, the heat insulating material 16 has an inner surface 16 g and an outer surface 16 h. The inner surface 16g is a surface of the wall portions 16a to 16f of the heat insulating material 16 facing the water-refrigerant heat exchanger 5. The outer surface 16h is an outer surface of the wall portions 16a to 16f of the heat insulating material 16, and is a surface opposite to the inner surface 16g.

The lower wall portion 16b of the heat insulating material 16 is provided with a mounting hole 16i for mounting the heat insulating material temperature sensor 56. The mounting hole 16i has, for example, a tapered structure, that is, a tapered structure that tapers toward the inner side of the hole. The heat insulating material temperature sensor 56 is fixed by being press-fitted into the mounting hole 16i, for example. The heat insulating material temperature sensor 56 detects the temperature inside the lower surface wall portion 16b. The refrigerant pipe 6 of the water-refrigerant heat exchanger 5 is in contact with the inner surface 16g of the lower surface wall portion 16b, and the base 8 facing the outside air is in contact with the outer surface 16h of the lower surface wall portion 16b. Therefore, the temperature inside the lower surface wall portion 16b detected by the heat insulating material temperature sensor 56 is an intermediate temperature between the temperature of the refrigerant pipe 6 in contact with the lower surface wall portion 16b and the outside air temperature.

The heat insulating material temperature sensor 56 may be molded so as to be embedded in the heat insulating material 16 by insert molding. For example, a pipe containing the heat insulating material temperature sensor 56 is arranged in a mold for molding the heat insulating material 16, and the material of the heat insulating material 16 is filled so as to surround the pipe. As a result, the heat insulating material temperature sensor 56 can be integrally molded with the heat insulating material 16, and the heat insulating material 16 in which the heat insulating material temperature sensor 56 is embedded can be easily manufactured.

Further, two heat insulating materials 16 having grooves formed in accordance with the shape of the heat insulating material temperature sensor 56 are prepared, and the two heat insulating materials 16 are bonded to each other so as to sandwich the heat insulating material temperature sensor 56. The heat insulating material 16 in which the above-mentioned material is embedded may be manufactured.

FIG. 7 is a block diagram showing the functions of the control device 21 of the first embodiment. As shown in FIG. 7, the control device 21 includes a control unit 22, a determination unit 23, a storage unit 24, and a timer 25. Information from the first temperature sensor 51, the second temperature sensor 52, the third temperature sensor 53, the fourth temperature sensor 54, the fifth temperature sensor 55, and the heat insulating material temperature sensor 56 is input to the control device 21. The control unit 22 controls the operations of the compressor 2, the expansion valve 3, the blower 15, and the water pump 34 based on the input information. The determination unit 23 determines whether the temperature of the refrigerant in the refrigerant circuit is steady or transient in the operation of the heat pump device 1. The storage unit 24 stores in advance set values for the compressor 2, the expansion valve 3, the blower 15, and the water pump 34. The timer 25 is a time measuring means.

Each function of the control device 21 is realized by the electronic board 18. For example, the control device 21 is composed of a processor such as a CPU. Each function of the control device 21 is realized by the processor constituting the control device 21 executing arithmetic processing according to the program.

Next, the operation of the heat pump device 1 in the hot water storage operation will be described with reference to FIG. The hot water storage operation is an operation of storing the hot water heated by the heat pump device 1 in the hot water storage tank 33. In the hot water storage operation, the control unit 22 drives the compressor 2, the blower 15, and the water pump 34.

When the compressor 2 is driven, the low-pressure refrigerant is sucked into the compressor 2. The low-pressure refrigerant sucked into the compressor 2 is compressed by the compressor 2 to become a high-temperature high-pressure refrigerant. This high-temperature and high-pressure refrigerant is discharged from the compressor 2 and flows into the water-refrigerant heat exchanger 5, and heats the water by exchanging heat with the water in the water pipe 40. As a result, the enthalpy of the refrigerant is lowered and the temperature is lowered. The high-pressure refrigerant whose temperature has dropped flows out of the water-refrigerant heat exchanger 5, passes through the refrigerant pipe 6, and flows into the expansion valve 3. The high-pressure refrigerant flowing into the expansion valve 3 is depressurized by the expansion valve 3 to lower the temperature, and becomes a low-temperature low-pressure refrigerant having a relatively low dryness in a gas-liquid two-phase state. This low-temperature low-pressure refrigerant flows out from the expansion valve 3, passes through the refrigerant pipe 6, and flows into the air-refrigerant heat exchanger 4. The low-temperature low-pressure refrigerant that has flowed into the air-refrigerant heat exchanger 4 exchanges heat with air in the air-refrigerant heat exchanger 4, and the enthalpy is increased, so that the degree of dryness is increased or the gas is brought into a gaseous state. The low-temperature low-pressure refrigerant having an increased enthalpy flows out from the air-refrigerant heat exchanger 4 and is sucked into the compressor 2. In this way, the refrigerant circulates in the refrigerant pipe 6, so that the heat pump cycle is performed.

Further, by driving the blower 15, air passes through the air-refrigerant heat exchanger 4 installed behind the blower 15. As a result, in the air-refrigerant heat exchanger 4, heat is exchanged between the refrigerant in the refrigerant pipe 6 and the air passing through the air-refrigerant heat exchanger 4. The air that has passed through the air-refrigerant heat exchanger 4 passes through the blower chamber 13 and is discharged forward from the exhaust port 9c of the front panel 9.

Further, by driving the water pump 34, the water in the lower part in the hot water storage tank 33 passes through the outgoing pipe 37, the first external pipe 35, the water inlet valve 19 and the first internal pipe 31, and the water-refrigerant heat exchanger 5 Inflow to. The water flowing into the water-refrigerant heat exchanger 5 is heated by heat exchange with the refrigerant in the water-refrigerant heat exchanger 5, so that hot water is generated. This hot water flows into the upper part of the hot water storage tank 33 through the second internal pipe 32, the hot water outlet valve 20, the second external pipe 36 and the return pipe 38. In this way, hot water is stored in the upper part of the hot water storage tank 33.

In the hot water storage operation, the control unit 22 increases the number of revolutions of the motor of the compressor 2 and the number of revolutions of the motor of the blower 15 according to the installation environment of the heat pump device 1 such as the outside air temperature and the usage conditions such as the heating temperature of water. The flow path opening degree of the valve 3 and the rotation speed of the water pump 34 are controlled.

Specifically, the control unit 22 changes the rotation speed of the motor of the compressor 2 in the range of about several tens of rps (Hz) to 100 rps (Hz). As a result, the circulation speed of the refrigerant in the refrigerant pipe 6 can be changed, and the heating capacity of the heat pump device 1 can be adjusted. Further, the control unit 22 changes the rotation speed of the motor of the blower 15 in the range of several hundred rpm to 1,000 rpm. Thereby, the flow rate of the air passing through the air-refrigerant heat exchanger 4 can be changed, and the amount of heat exchange between the refrigerant and the air in the air-refrigerant heat exchanger 4 can be adjusted. Further, the control unit 22 can adjust the pressure of the high-pressure refrigerant on the upstream side and the pressure of the low-pressure refrigerant on the downstream side of the expansion valve 3 by changing the flow path opening degree of the expansion valve 3. Further, the control unit 22 can change the circulation speed of water in the water pipe 40 by changing the rotation speed of the water pump 34, and heat exchange between the refrigerant and water in the water-refrigerant heat exchanger 5. The amount can be adjusted.

Here, when the heat pump device 1 is stopped for a long time, each component constituting the heat pump device 1 including the heat insulating material 16 has a temperature close to the outside air temperature. When the hot water storage operation is started in this state, the high-temperature refrigerant discharged from the compressor 2 not only gives heat to the water in the water pipe 40 in the water-refrigerant heat exchanger 5, but also a heat pump including the heat insulating material 16. It circulates in the refrigerant pipe 6 while applying heat to each component of the device 1. At this time, the state in which the temperature of the refrigerant in the refrigerant pipe 6 is transiently rising is called a transient state. The transient state continues until heat is sufficiently applied to each component including the heat insulating material 16 to stabilize the temperature of each component, and the temperature of the refrigerant in the refrigerant pipe 6 stabilizes. A state in which the temperature of the refrigerant in the refrigerant pipe 6 is stable and becomes steady is called a steady state.

The control unit 22 sets an actuator such as an expansion valve 3 so that the temperature of the refrigerant discharged from the compressor 2 becomes a target set temperature in order to set the temperature of the water discharged from the water-refrigerant heat exchanger 5 to the set temperature. Control the operation of. In the transient state, the temperature of the refrigerant sucked into the compressor 2 continues to be lower than that in the steady state. Even in this case, the control unit 22 is discharged from the compressor 2 in order to control the operation of the actuator such as the expansion valve 3 so that the temperature of the refrigerant discharged from the compressor 2 becomes the target set temperature. The pressure of the refrigerant becomes higher than that in the steady state, and the load applied to the compressor 2 increases. Further, the power consumption of the compressor 2 is increased, the operating efficiency of the heat pump device 1 is lowered, the noise due to the vibration of the compressor 2 is increased, and the long-term reliability of the high-pressure refrigerant circuit component is lowered.

Therefore, the control unit 22 performs control different from the steady state in the transient state. For example, in the transient state, the control unit 22 drives the rotation speed of the blower 15 at a rotation speed higher than the rotation speed in the steady state. As a result, the amount of heat given to the refrigerant from the air in the air-refrigerant heat exchanger 4 can be increased, and the load on the compressor 2 can be reduced. Further, the effects of reducing the power consumption of the compressor 2, improving the operating efficiency of the heat pump device 1, reducing the noise due to the vibration of the compressor 2, and maintaining the long-term reliability of the high-pressure refrigerant circuit parts can be obtained.

Next, the switching from the operation control in the transient state to the operation control in the steady state in the hot water storage operation will be described with reference to FIG. FIG. 8 is a diagram showing a temperature change in the temperature sensor of the heat pump device 1 of the first embodiment and a change in the rotation speed of the blower. FIG. 8A is a diagram showing a time change of the temperature detected by the temperature sensor, and FIG. 8B is a diagram showing a time change of the rotation speed of the blower.

When the control unit 22 starts the hot water storage operation at the time t0, the temperature T1 detected by the first temperature sensor 51, that is, the temperature T1 of the refrigerant discharged from the compressor 2, becomes the target set temperature T1a. Ascend to. As the temperature T1 of the refrigerant discharged from the compressor 2 rises, the temperature T5 detected by the fifth temperature sensor 55, that is, the temperature T5 of the water discharged from the water-refrigerant heat exchanger 5, is set to the set temperature. It rises to T5a. The set temperature T1a is stored in advance in the storage unit 24, for example, in association with the set temperature T5a of the water discharged from the water-refrigerant heat exchanger 5. The set temperature T1a may be calculated by the control unit 22 from the set temperature T5a of water.

At time t1, the temperature T1 of the refrigerant discharged from the compressor 2 becomes stable at the set temperature T1a. However, in this state, the temperature of the refrigerant is not constant in the refrigerant pipe 6 in a state where the refrigerant in the refrigerant pipe 6 gives heat to each component of the heat pump device 1. For example, as shown in FIG. 8, at time t1, the temperature T6 of the heat insulating material detected by the heat insulating material temperature sensor 56 is not constant, so that the temperature of the refrigerant discharged from the water-refrigerant heat exchanger 5 is also constant. Not targeted. Therefore, when the control unit 22 switches from the operation control in the transient state to the operation control in the steady state at time t1, the temperature of the refrigerant sucked into the compressor 2 is lower than that in the steady state, so that the compressor 2 is affected. This leads to problems such as an increase in load, an increase in power consumption of the compressor 2, a decrease in operating efficiency of the heat pump device 1, an increase in noise due to vibration of the compressor 2, and a decrease in long-term reliability of high-pressure refrigerant circuit components.

Therefore, in the present embodiment, the control unit 22 switches from the operation control in the transient state to the operation control in the steady state by using the temperature T6 of the heat insulating material 16 detected by the heat insulating material temperature sensor 56. After the start of the hot water storage operation, the temperature T6 of the heat insulating material 16 rises from a temperature close to the outside air temperature T3 and stabilizes at a time t2 later than the time t1. The stable temperature T6a is a temperature between the temperature of the refrigerant in the refrigerant pipe 6 of the water-refrigerant heat exchanger 5 in contact with the heat insulating material 16 and the outside air temperature T3.

The temperature T6 of the heat insulating material 16 is stabilized by sufficiently applying heat from the refrigerant in the refrigerant pipe 6 and stabilizing the temperature of the refrigerant in the refrigerant pipe 6 of the water-refrigerant heat exchanger 5. Therefore, the time t2 at which the temperature T6 of the heat insulating material 16 stabilizes is more stable than the time t1 at which the temperature T1 of the refrigerant discharged from the compressor 2 stabilizes. It's close to the time when it became. Therefore, at the time t2 when the temperature T6 of the heat insulating material 16 is stable, the determination unit 23 determines that the state is steady, and the control unit 22 switches from the operation control in the transient state to the operation control in the steady state. As a result, it is possible to switch from the operation control in the transient state to the operation control in the steady state more appropriately than using the temperature T1 of the refrigerant discharged from the compressor 2.

Next, the specific control performed by the control device 21 will be described with reference to FIG. FIG. 9 is a flowchart showing the operation of the control device 21 of the first embodiment during the hot water storage operation.

The control of the hot water storage operation starts from the “start” in FIG. The control device 21 first performs operation control in a transient state. In step S1, the control unit 22 drives the compressor 2 and the water pump 34.

In step S2, the control unit 22 drives the blower 15. The rotation speed N of the blower 15 at this time is a value obtained by adding the set increase amount ΔN to the set rotation speed Na in the steady state. For example, the set rotation speed Na in the steady state is stored in advance in the storage unit 24 in association with the outside air temperature T3a at the start of the hot water storage operation, or is calculated by the control unit 22 from the outside air temperature T3a. Further, the set increase amount ΔN is stored in the storage unit 24 in advance in association with the set temperature T1a and the outside air temperature T3a, or is calculated by the control unit 22 from the set temperature T1a and the outside air temperature T3a.

The order of steps S1 and S2 may be reversed, and the control unit 22 may first drive the blower 15 and then the compressor 2 and the water pump 34.

In step S3, the timer 25 starts measuring the time.

In step S4, the determination unit 23 determines whether the time measured by the timer 25 has elapsed the set time δt. The set time δt is a value preset in the storage unit 24. If the determination unit 23 determines in step S4 that the set time δt has not elapsed, the process returns to step S4 again, and step S4 is repeated until the determination unit 23 determines that the set time δt has elapsed.

If the determination unit 23 determines in step S4 that the set time δt has elapsed, the process proceeds to step S5.

In step S5, the determination unit 23 determines whether or not the temperature T6 of the heat insulating material 16 is equal to or higher than the expected temperature T6a expected to be reached when the temperature of the heat insulating material 16 becomes steady. The expected temperature T6a is stored in advance in the storage unit 24 in association with the set temperature T1a and the outside air temperature T3a, or is calculated by the control unit 22 from the set temperature T1a and the outside air temperature T3a.

If the determination unit 23 determines in step S5 that the temperature T6 of the heat insulating material 16 is smaller than the expected temperature T6a, the determination unit 23 determines in step S6 that the temperature T6 is in a transient state, and proceeds to step S7.

In step S7, the control unit 22 reduces the rotation speed N of the blower 15 by the set reduction amount δN. The set reduction amount δN is a value stored in advance in the storage unit 24 in association with the time change amount δT6 of the temperature T6 of the heat insulating material 16, and ΔN when the temperature T6 of the heat insulating material 16 reaches the expected temperature T6a. -ΔN-δN ...- δN = 0. The time change amount δT6 is the amount of change during the set time δt of the temperature T6 of the heat insulating material 16. Each time the control unit 22 controls step S7, the rotation speed N of the blower 15 is reduced by a set reduction amount δN, and the rotation speed N is changed to N = Na + ΔN−δN−δN ...—δN. By reducing the rotation speed of the blower 15 in step S7, the increase in the rotation speed of the blower 15 in the transient state can be suppressed to the minimum necessary, and the increase in noise due to the increase in the rotation speed of the blower 15 can be minimized. Can be suppressed to.

When the control unit 22 changes the rotation speed of the blower 15 in step S7, the process proceeds to step S3, and the timer 25 starts measuring the time again.

Then, in step S5, when the determination unit 23 determines that the temperature T6 of the heat insulating material 16 has reached the expected temperature T6a or higher, the process proceeds to step S8, and the determination unit 23 determines that the steady state has been reached.

When the determination unit 23 is determined to be in the steady state in step S8, the control unit 22 sets the rotation speed N of the blower 15 to N = Na in step S9. That is, in step S9, the control unit 22 does not change the rotation speed N as N = Na when the rotation speed N of the blower 15 is N = Na, and does not change the rotation speed N when the rotation speed N is N ≠ Na. Is changed to N = Na.

According to the first embodiment, the heat insulating material temperature sensor 56 for detecting the temperature of the heat insulating material 16 is provided, and the control unit 22 uses the temperature of the heat insulating material 16 detected by the heat insulating material temperature sensor 56 in a transient state. Switched from the operation control of the above to the operation control in the steady state. Therefore, the accuracy of determining whether the state is a transient state or a steady state can be improved as compared with using the temperature of the refrigerant discharged from the compressor 2, and the operation in the transient state is changed to the operation in the steady state. You can switch to control appropriately. As a result, the load of the compressor 2 is reduced, the power consumption of the compressor 2 is reduced, the operating efficiency of the heat pump device 1 is improved, the noise due to the vibration of the compressor 2 is reduced, and the long-term reliability of the high-pressure refrigerant circuit parts is improved. The effect of maintenance can be obtained.

Further, in the first embodiment, the heat insulating material temperature sensor 56 is attached to the inside of the lower surface wall portion 16b of the heat insulating material 16. The lower surface wall portion 16b is in contact with the refrigerant pipe 6 of the water-refrigerant heat exchanger 5 and the base 8 facing the outside air. Therefore, since the temperature of the lower surface wall portion 16b is greatly affected by the temperature of the refrigerant in the refrigerant pipe 6 and the outside air temperature, the expected temperature T6a can be easily calculated from the temperature of the refrigerant in the refrigerant pipe 6 and the outside air temperature. can. Further, since the temperature difference between the temperature of the refrigerant in the refrigerant pipe 6 of the water-refrigerant heat exchanger 5 and the outside air temperature is large, the temperature change of the heat insulating material 16 can be easily measured. Therefore, it is possible to easily determine whether or not the temperature T6 of the heat insulating material 16 in step S5 of FIG. 9 is equal to or higher than the expected temperature T6a, and the accuracy of determining whether the heat insulating material 16 is in the transient state or the steady state is improved. Can be made to.

In the first embodiment, the rotation speed of the blower 15 is reduced in step S7 to minimize the increase in the rotation speed of the blower 15 in the transient state, but step S7 is omitted. May be good. That is, while the determination unit 23 determines that the state is in a transient state, the rotation speed N of the blower 15 may be continuously driven with the rotation speed N = Na + ΔN determined in step S2.

Further, in the first embodiment, the heat insulating material temperature sensor 56 is attached to the lower surface wall portion 16b, but it may be attached to the upper surface wall portion 16a or the side wall portion instead of the lower surface wall portion 16b. The side wall portion is a front wall portion 16c, a rear wall portion 16d, a right surface wall portion 16e, and a left surface wall portion 16f. Even in this case, if the heat insulating material temperature sensor 56 is attached to the wall portion in contact with the refrigerant pipe 6 of the water-refrigerant heat exchanger 5, the temperature change of the heat insulating material 16 can be easily measured.

Further, the heat insulating material temperature sensor 56 may be attached not to the wall portion in contact with the refrigerant pipe 6 but to the wall portion not in contact with the refrigerant pipe 6. Even in this case, if the refrigerant pipe 6 is in contact with any of the wall portions 16a to 16f, the heat of the refrigerant is transferred to the heat insulating material 16 from the contacted portion, so that the temperature change of the heat insulating material 16 is measured. It is possible to determine whether it is in a transient state or a steady state.

Further, as shown in FIG. 6, in the present embodiment, the heat insulating material temperature sensor 56 is attached so as to be located at an intermediate position between the inner surface 16g and the outer surface 16h on the lower surface wall portion 16b. The temperature sensor 56 may be attached to a portion other than the intermediate portion between the inner surface 16g and the outer surface 16h. FIG. 10 is a cross-sectional view of the heat insulating material 16 of the first modification of the first embodiment, and is a cross-sectional view taken along the line AA in FIG. As shown in FIG. 10, the heat insulating material temperature sensor 56 may be attached between the inner surface 16g and the outer surface 16h on the outer surface 16h side of the intermediate position. The heat of the refrigerant in the refrigerant pipe 6 is transferred more slowly on the outer surface 16h side than on the inner surface 16g side of the heat insulating material 16, and the temperature is stabilized by sufficiently applying heat from the refrigerant, so is it in a transient state? It is possible to improve the accuracy of determining whether the state is in a steady state.

FIG. 11 is a cross-sectional view of the heat insulating material 16 of the second modification of the first embodiment, and is a cross-sectional view taken along the line AA in FIG. As shown in FIG. 11, the heat insulating material temperature sensor 56 may be attached to the outer surface 16h of the heat insulating material. Even in this case, since the temperature of the outer surface 16h of the heat insulating material is stabilized by sufficiently applying heat from the refrigerant in the refrigerant pipe 6 to the heat insulating material 16, the temperature of the outer surface 16h of the heat insulating material is used for transients. It is possible to determine whether it is in a state or a steady state.

FIG. 12 is a cross-sectional view of the heat insulating material 16 of the third modification of the first embodiment, and is a cross-sectional view taken along the line AA in FIG. As shown in FIG. 12, a projecting portion 60 projecting from any of the wall portions 16a to 16f may be provided, and the heat insulating material temperature sensor 56 may be attached to the projecting portion 60. In FIG. 12, the projecting portion 60 projects from the lower surface wall portion 16b toward the portion of the refrigerant pipe 6 covered with the heat insulating material 16, that is, the refrigerant pipe 6 of the water-refrigerant heat exchanger 5. By providing the protrusion 60, the heat insulating material temperature sensor 56 can be attached even when the wall thicknesses 16a to 16f of the heat insulating material 16 are thin. Further, since the protruding portion 60 projects so as to be in close contact with the refrigerant pipe 6 of the water-refrigerant heat exchanger 5, even if the heat insulating material 16 is a material that does not easily transfer heat, the refrigerant pipe 6 is connected to the heat insulating material 16. The heat is easily transferred from the heat insulating material 16, and the temperature change of the heat insulating material 16 can be easily measured.

Further, in the first embodiment, it has been described that the heat insulating material temperature sensor 56 is attached to one place on the lower surface wall portion 16b, but it may be attached to two or more places on the wall portions 16a to 16f of the heat insulating material 16. Since the temperature of the heat insulating material 16 can be detected at two or more places, the variation depending on the detection place can be corrected, and the accuracy of determining whether the state is a transient state or a steady state can be improved. ..

Embodiment 2.
In the first embodiment, the determination unit 23 determines that the steady state is reached when the temperature T6 of the heat insulating material 16 becomes the expected temperature T6a or higher, but in the second embodiment, the determination unit 23 determines that the heat insulating material 16 is in a steady state. When the time change amount δT6 of the temperature T6 of the above temperature becomes equal to or less than the set change amount, it is determined that the steady state has been reached.

Since the configuration other than the control device 21 of the second embodiment is the same as that of the first embodiment, the description thereof will be omitted.

The control of the control device 21 of the second embodiment during the hot water storage operation will be described with reference to FIG. FIG. 13 is a flowchart showing the operation of the control device 21 of the second embodiment during the hot water storage operation.

In the second embodiment, step S5 of the first embodiment is step S10.

In step S4, when the determination unit 23 determines that the set time δt has elapsed, in step S10, the determination unit 23 determines whether or not the time change amount δT6 of the temperature T6 of the heat insulating material 16 is equal to or less than the set change amount δT6a. do. The time change amount δT6 is the amount of change during the set time δt of the temperature T6 of the heat insulating material 16 as described in the first embodiment. Further, the set change amount δT6a is stored in advance in the storage unit 24.

In step S10, when the determination unit 23 determines that the time change amount δT6 of the temperature T6 of the heat insulating material 16 is larger than the set change amount δT6a, the process proceeds to step S6, and the determination unit 23 determines that it is in a transient state.

In step S10, when the determination unit 23 determines that the time change amount δT6 of the temperature T6 of the heat insulating material 16 is equal to or less than the set change amount δT6a, the process proceeds to step S8, and the determination unit 23 determines that the steady state has been reached.

Since the steps other than step S10 are the same as those in the first embodiment, the description thereof will be omitted.

According to the second embodiment, as in the first embodiment, the heat insulating material temperature sensor 56 for detecting the temperature of the heat insulating material 16 is provided, and the control unit 22 controls the temperature of the heat insulating material 16 detected by the heat insulating material temperature sensor 56. Was used to switch from operation control in the transient state to operation control in the steady state. Therefore, the accuracy of determining whether the state is a transient state or a steady state can be improved as compared with using the temperature of the refrigerant discharged from the compressor 2, and the operation in the transient state is changed to the operation in the steady state. You can switch to control appropriately. As a result, the load of the compressor 2 is reduced, the power consumption of the compressor 2 is reduced, the operating efficiency of the heat pump device 1 is improved, the noise due to the vibration of the compressor 2 is reduced, and the long-term reliability of the high-pressure refrigerant circuit parts is improved. The effect of maintenance can be obtained.

Further, when the heat insulating material temperature sensor 56 is attached to the inside of the lower surface wall portion 16b in contact with the refrigerant pipe 6 of the water-refrigerant heat exchanger 5 and the base 8 facing the outside air, the refrigerant in the refrigerant pipe 6 Since it is greatly affected by the temperature of the heat insulating material 16 and the outside air temperature, the temperature change of the heat insulating material 16 can be easily measured. Therefore, it is possible to easily determine whether or not the time change amount δT6 of the temperature T6 of the heat insulating material 16 in step S10 of FIG. 13 is equal to or less than the set change amount δT6a, and whether it is in a transient state or a steady state. The accuracy of the determination can be improved.

Embodiment 3.
FIG. 14 is a diagram showing a heat pump hot water supply system 100 including the heat pump device 1 of the third embodiment. FIG. 15 is a block diagram showing a function of the control device 21 according to the third embodiment. In the first and second embodiments, the heat insulating material temperature sensor 56 that detects the temperature of the heat insulating material 16 is provided, and the temperature of the heat insulating material 16 detected by the heat insulating material temperature sensor 56 is used to perform steady operation control in a transient state. Changed to switch to the operation control in the state. On the other hand, in the third embodiment, as shown in FIG. 14, a cover member temperature sensor 58 for detecting the temperature of the cover member 57 covering a part of the refrigerant pipe 6 is provided, and the cover member detected by the cover member temperature sensor 58 is provided. Using the temperature of 57, the operation control in the transient state is switched to the operation control in the steady state.

Like the heat insulating material 16, the cover member 57 is made of foamed plastic such as polyurethane foam or polystyrene foam. The cover member 57 may be made of a material other than foamed plastic such as rubber. Further, the cover member 57 does not have to cover the entire circumference of the refrigerant pipe 6, and may cover a part of the refrigerant pipe 6 such as covering a half circumference of the refrigerant pipe 6.

The temperature of the cover member 57 is stabilized by sufficiently applying heat from the refrigerant in the refrigerant pipe 6 and stabilizing the temperature of the refrigerant in the refrigerant pipe 6. Therefore, the time during which the temperature of the cover member 57 stabilizes is close to the time during which the temperature of the entire refrigerant in the refrigerant pipe 6 stabilizes in a steady state. Therefore, the determination unit 23 determines that the cover member 57 is in a steady state when the temperature is stable, and the control unit 22 switches from the control in the transient state to the operation control in the steady state. As a result, it is possible to switch from the operation control in the transient state to the operation control in the steady state more appropriately than using the temperature T1 of the refrigerant discharged from the compressor 2.

The third embodiment is the same as the first and second embodiments except that the cover member 57 is provided and the heat insulating material temperature sensor 56 replaces the cover member temperature sensor 58, and thus the description thereof will be omitted.

According to the third embodiment, the cover member temperature sensor 58 for detecting the temperature of the cover member 57 covering a part of the refrigerant pipe 6 is provided, and the control unit 22 determines the cover member 57 detected by the cover member temperature sensor 58. Using temperature, the operation control in the transient state is switched to the operation control in the steady state. Therefore, the accuracy of determining whether the state is a transient state or a steady state can be improved as compared with using the temperature of the refrigerant discharged from the compressor 2, and the operation in the transient state is changed to the operation in the steady state. You can switch to control appropriately. As a result, the load of the compressor 2 is reduced, the power consumption of the compressor 2 is reduced, the operating efficiency of the heat pump device 1 is improved, the noise due to the vibration of the compressor 2 is reduced, and the long-term reliability of the high-pressure refrigerant circuit parts is improved. The effect of maintenance can be obtained.

In the third embodiment, the cover member 57 is provided so as to cover a part of the refrigerant pipe 6, but the cover member 57 may be provided so as to cover a part of the water pipe 40. FIG. 16 is a diagram showing a heat pump hot water supply system 100 provided with a heat pump device 1 according to a modified example of the third embodiment. As shown in FIG. 16, the cover member 57 is provided so as to cover a part of the water pipe 40 between the water-refrigerant heat exchanger 5 and the hot water storage tank 33.

The temperature of the cover member 57 is stabilized by sufficiently applying heat from the hot water discharged from the water-refrigerant heat exchanger 5 and stabilizing the temperature of the hot water discharged from the water-refrigerant heat exchanger 5. Since the temperature of the hot water discharged from the water-refrigerant heat exchanger 5 stabilizes, the temperature of the refrigerant in the refrigerant pipe 6 also stabilizes, so that the time during which the temperature of the cover member 57 stabilizes is the refrigerant in the refrigerant pipe 6. It is close to the time when the overall temperature becomes stable and steady. Therefore, even when the cover member 57 covers a part of the water pipe 40, the determination unit 23 determines that the cover member 57 is in a steady state when the temperature is stable, and the control unit 22 controls from the transient state. By switching to the operation control in the steady state, it is possible to switch from the operation control in the transient state to the operation control in the steady state more appropriately than using the temperature of the refrigerant discharged from the compressor 2.

The operation control in the transient state and the operation control in the steady state are not limited to the controls described in the first to third embodiments. In the first to third embodiments, the rotation speed of the blower 15 is controlled to be changed between the transient state and the steady state. However, for example, the flow path opening degree of the expansion valve 3 may be changed. Further, control may be performed to change the rotation speed of the compressor 2. If the heat pump device controls to switch from the operation control in the transient state to the operation control in the steady state, by applying the present invention, the operation control in the transient state can be appropriately switched to the operation control in the steady state. Can be done.

Further, in the first to third embodiments, switching from the operation control in the transient state to the operation control in the steady state in the hot water storage operation has been described, but the present invention can be applied to the control other than the hot water storage operation. For example, the present invention can be applied to a product that does not have a hot water storage tank 33 and directly supplies hot water heated by the heat pump device 1 to the user side. The present invention can also be applied to a product in which the heat medium heated by the heat pump device 1 is used for heating or the like.

According to each of the embodiments described above, it is possible to obtain a heat pump device excellent in energy saving performance, quietness performance and reliability. The performance and quality of the heat pump device are of great interest to the user, and the present invention contributes significantly.

1 Heat pump device, 2 Compressor, 3 Expansion valve, 4 Air-refrigerator heat exchanger, 4a fin, 5 Water-refrigerator heat exchanger, 6 refrigerant piping, 7 housing, 8 base, 8a bottom part, 8b right side, 9 Front panel, 9a Front, 9b Left side, 9c Exhaust port, 9d grid, 10 Back panel, 10a Rear, 10b Right side, 10c Service panel, 11 Top panel, 12 Machine room, 13 Blower room, 14 Partition plate , 15 Blower, 15a Propeller wing, 16 Insulation, 16a Top wall, 16b Bottom wall, 16c Front wall, 16d Rear wall, 16e Right wall, 16f Left wall, 17 Electrical storage box, 17a terminal Table, 18 Electronic board, 19 Water inlet valve, 20 Hot water outlet valve, 21 Control device, 22 Control unit, 23 Judgment unit, 24 Storage unit, 25 Timer, 30 Hot water storage device, 31 First internal piping, 32 Second internal piping , 33 Hot water storage tank, 34 Water pump, 35 1st external piping, 36 2nd external piping, 37 Outward piping, 38 Return piping, 39 Heat exchanger water piping, 40 Water piping, 41 Mixing valve, 42 1st hot water supply piping, 43 1st water supply pipe, 44 2nd hot water supply pipe, 45 2nd water supply pipe, 51 1st temperature sensor, 52 2nd temperature sensor, 53 3rd temperature sensor, 54 4th temperature sensor, 55 5th temperature sensor, 56 Insulation Material temperature sensor, 57 cover member, 58 cover member temperature sensor, 100 heat pump hot water supply system.

The heat pump device according to the present invention includes a compressor that compresses the refrigerant, a decompression device that decompresses the refrigerant, a refrigerant pipe that connects the compressor and the decompression device to circulate the refrigerant, and refrigerant and air in the refrigerant pipe. A first heat exchanger that exchanges heat between the two, a second heat exchanger that exchanges heat between the refrigerant and the heat medium in the refrigerant pipe, a cover member that covers the second heat exchanger, and a cover member. Using the cover member temperature sensor that detects the temperature of the It is provided with a control unit that switches to operation control in a steady state in which the temperature is constant.

Claims (10)

A compressor that compresses the refrigerant and
A decompression device that decompresses the refrigerant and
A refrigerant pipe that connects the compressor and the decompression device and circulates the refrigerant, and
A first heat exchanger that exchanges heat between the refrigerant and air in the refrigerant pipe,
A second heat exchanger that exchanges heat between the refrigerant and the heat medium in the refrigerant pipe.
A cover member that covers a part of the refrigerant pipe and
A cover member temperature sensor that detects the temperature of the cover member and
Using the temperature detected by the cover member temperature sensor, the temperature of the refrigerant in the refrigerant pipe is steady from the operation control in a transient state in which the temperature of the refrigerant in the refrigerant pipe changes transiently. A control unit that switches to steady-state operation control,
Heat pump device equipped with. The heat pump device according to claim 1, wherein the cover member temperature sensor is attached to a portion of the cover member in contact with the refrigerant pipe. Equipped with a housing that forms the outer shell
The heat pump device according to claim 1 or 2, wherein the cover member temperature sensor is attached to a portion of the cover member in contact with the housing. The cover member has a protruding portion protruding toward a portion of the refrigerant pipe covered with the cover member.
The heat pump device according to any one of claims 1 to 3, wherein the cover member temperature sensor is attached to the protruding portion. The heat pump device according to any one of claims 1 to 4, wherein the cover member is a heat insulating material that covers at least a part of the second heat exchanger. A compressor that compresses the refrigerant and
A decompression device that decompresses the refrigerant and
A refrigerant pipe that connects the compressor and the decompression device and circulates the refrigerant, and
A first heat exchanger that exchanges heat between the refrigerant and air in the refrigerant pipe,
A second heat exchanger that exchanges heat between the refrigerant in the refrigerant pipe and the hot water in the water pipe in which the hot water in the hot water storage tank circulates.
A cover member that covers a part of the water pipe between the second heat exchanger and the hot water storage tank.
A cover member temperature sensor that measures the temperature of the cover member,
Using the temperature detected by the cover member temperature sensor, the temperature of the refrigerant in the refrigerant pipe is steady from the operation control in a transient state in which the temperature of the refrigerant in the refrigerant pipe changes transiently. A control unit that switches to steady-state operation control,
Heat pump device equipped with. The heat pump device according to any one of claims 1 to 6, wherein a plurality of the cover member temperature sensors are attached to the cover member. The heat pump device according to any one of claims 1 to 7, wherein the cover member temperature sensor is attached to a mounting hole formed in the cover member. The heat pump device according to any one of claims 1 to 8, wherein the cover member temperature sensor is integrally molded with the cover member. The first heat exchanger is provided with a blower that blows air.
The heat pump device according to any one of claims 1 to 9, wherein the control unit increases the rotation speed of the blower in the transient state to be higher than that in the steady state.

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