JPWO2018189860A1 - Water refrigerant heat exchanger and heat pump device equipped with water heat exchanger - Google Patents

Abstract

The water-refrigerant heat exchanger includes a water pipe through which water flows and a refrigerant pipe through which refrigerant flows, and performs heat exchange between water flowing through the water pipe and refrigerant flowing through the refrigerant pipe. The refrigerant pipe of the water refrigerant heat exchanger is spirally wound around the outer peripheral surface of the water pipe. Moreover, the air piping which contains air inside is arrange | positioned in the area | region where refrigerant | coolant piping was wound among the water piping of a water refrigerant | coolant heat exchanger. The heat pump device exchanges heat between the water refrigerant heat exchanger configured as described above, a compressor that compresses the refrigerant, a decompression device that decompresses the refrigerant, and the refrigerant decompressed by the decompression device and the outside air. An evaporator.

Description

  The present invention relates to a water refrigerant heat exchanger and a heat pump apparatus including the water heat exchanger.

  Patent Document 1 discloses a technique related to a heat exchanger used in a heat pump type hot water heater. In this technique, a heat exchanger has been proposed in which a refrigerant double pipe spirally twisted is arranged in a water pipe. According to such a heat exchanger, since the water flow in the water pipe is turbulently disturbed, heat exchange between water and the refrigerant is promoted.

Japanese Unexamined Patent Publication No. 2009-216309

  In the heat pump cycle, high-pressure refrigerant is introduced into the heat exchanger. For this reason, in the configuration in which the refrigerant pipe is arranged in the water pipe as in Patent Document 1, a countermeasure for reliably preventing the refrigerant from leaking into the water is required. In Patent Document 1, the refrigerant pipe is made to have a double structure to prevent leakage of the refrigerant, but there is a problem that the structure becomes complicated. Thus, in the water-refrigerant heat exchanger used in the heat pump cycle, an improvement is desired in terms of increasing the heat exchange efficiency with a simple configuration.

  The present invention has been made to solve the above-described problems, and provides a water-refrigerant heat exchanger capable of increasing heat exchange efficiency with a simple configuration, and a heat pump device using the heat exchanger. For the purpose.

  The present invention includes a water refrigerant heat exchanger including a water pipe through which water flows and a refrigerant pipe through which a refrigerant flows, and performs heat exchange between water flowing through the water pipe and a refrigerant flowing through the refrigerant pipe, and It is applied to a heat pump device using a water refrigerant heat exchanger. The refrigerant pipe of the water refrigerant heat exchanger is spirally wound around the outer peripheral surface of the water pipe. Moreover, the air piping which contains air inside is arrange | positioned in the area | region where refrigerant | coolant piping was wound among the water piping of a water refrigerant | coolant heat exchanger. The heat pump device exchanges heat between the water refrigerant heat exchanger configured as described above, a compressor that compresses the refrigerant, a decompression device that decompresses the refrigerant, and the refrigerant decompressed by the decompression device and the outside air. An evaporator.

  According to the water refrigerant heat exchanger of the present invention and the heat pump device using this water refrigerant heat exchanger, it is possible to increase the heat exchange efficiency with a simple configuration.

It is a front view which shows the internal structure of the heat pump apparatus of Embodiment 1. FIG. It is the external appearance perspective view which looked at the heat pump apparatus of Embodiment 1 from diagonally forward. It is the external appearance perspective view which looked at the heat pump apparatus of Embodiment 1 from diagonally back. It is a figure which shows the refrigerant circuit and water circuit of a heat pump hot-water supply system provided with the heat pump apparatus of Embodiment 1. FIG. It is a figure for demonstrating the principal part of the water refrigerant | coolant heat exchanger of Embodiment 1. FIG. It is a figure for demonstrating the structure of the water piping of a water refrigerant heat exchanger. It is a figure for demonstrating the principal part of the water refrigerant | coolant heat exchanger of Embodiment 2. FIG. It is a figure for demonstrating the principal part of the water refrigerant | coolant heat exchanger of Embodiment 3. FIG. It is a figure for demonstrating the principal part of the water refrigerant | coolant heat exchanger of Embodiment 4. FIG.

  Hereinafter, embodiments will be described with reference to the drawings. Elements common to the drawings are denoted by the same reference numerals, and redundant description is simplified or omitted. In addition, the present disclosure may include all combinations of configurations that can be combined among the configurations described in the following embodiments.

Embodiment 1 FIG.
FIG. 1 is a front view showing the internal structure of the heat pump device 1 of the first embodiment. FIG. 2 is an external perspective view of the heat pump device 1 according to the first embodiment as viewed obliquely from the front. FIG. 3 is an external perspective view of the heat pump device 1 according to the first embodiment as viewed obliquely from behind. And FIG. 4 is a figure which shows the refrigerant circuit and water circuit of a heat pump hot-water supply system provided with the heat pump apparatus 1 of Embodiment 1. FIG.

  The heat pump apparatus 1 of this Embodiment is installed outdoors. The heat pump device 1 heats a liquid heat medium. The heat medium in the present embodiment is water. The heat pump device 1 generates hot water by heating water. The heat medium in the present invention may be, for example, calcium chloride aqueous solution, ethylene glycol aqueous solution, alcohol or the like.

  As shown in FIG. 1, the heat pump apparatus 1 includes a base 17 that forms a bottom plate of a housing. On the base 17, as viewed from the front, a machine room 14 is formed on the right side, and a blower room 15 is formed on the left side. The machine room 14 and the blower room 15 are separated by a partition plate 16 extending in the vertical direction. As shown in FIGS. 2 and 3, the casing forming the outline of the heat pump apparatus 1 further includes a front panel 18, a back panel 19, and a top panel 20 in addition to the base 17 described above. The front panel 18 includes a front surface portion 18a that covers the front surface portion of the housing and a left side surface portion 18b that covers the left side surface of the housing. The back panel 19 includes a rear surface portion 19a that covers the rear surface portion of the housing and a right side surface portion 19b that covers the right side surface of the housing. The top panel 20 is configured to cover the upper surface portion of the housing. These components of the housing are formed from, for example, a sheet metal material. The outer surface of the heat pump device 1 is covered with this casing except for the air refrigerant heat exchanger 7 disposed on the rear surface side. FIG. 1 shows a state in which each part of the casing other than the base 17 is removed. Further, in FIG. 1, illustration of some of the constituent devices is omitted.

  As shown in FIG. 1, in the machine room 14, as a refrigerant circuit component, a compressor 2 that compresses refrigerant, an expansion valve 10 that depressurizes the refrigerant (not shown in FIG. 1), a suction pipe 4 that connects these, and a discharge A refrigerant pipe such as the pipe 5 is incorporated.

  The compressor 2 includes a compression unit (not shown) and a motor (not shown) inside a cylindrical shell. The compression unit performs a refrigerant compression operation. The motor drives the compression unit. The compressor motor is driven by the electric power supplied from the outside. The refrigerant is sucked into the compressor 2 through the suction pipe 4. A discharge pipe 5 that discharges the refrigerant compressed in the compressor 2 is connected to the upper portion of the compressor 2. The expansion valve 10 has a coil built-in member attached to the outer surface of the main body. By energizing the coil from the outside, the internal flow resistance adjusting unit is operated to adjust the flow resistance of the refrigerant. The expansion valve 10 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. The expansion valve 10 is an example of a decompression device that decompresses the refrigerant.

  The blower room 15 has a larger space than the machine room 14 in order to secure an air passage. A blower 6 is incorporated in the blower chamber 15. The blower 6 includes two to three propeller blades and a motor that rotationally drives the propeller blades. The motor and propeller blades are rotated by electric power supplied from the outside. An air refrigerant heat exchanger 7 is installed on the rear side of the blower chamber 15 so as to face the blower 6. The air refrigerant heat exchanger 7 includes a large number of thin aluminum fins and a long refrigerant pipe that reciprocates several times in close contact with the thin aluminum fins. Each fin has a vertically long rectangular shape, and is fixed to the refrigerant tube in a stacked state with a minute gap in the lateral direction. The air refrigerant heat exchanger 7 has a flat outer shape bent in an L shape. The air refrigerant heat exchanger 7 is installed from the rear surface to the left side surface of the heat pump device 1. The end portion on the rear surface side of the air refrigerant heat exchanger 7 extends to the rear side of the machine room 14. For this reason, the partition plate 16 has a flat outer shape bent in an L shape, and is installed so as to partition the space from the front surface of the heat pump device 1 to the end portion on the rear surface side of the air refrigerant heat exchanger 7. . In the air refrigerant heat exchanger 7, heat is exchanged between the refrigerant in the refrigerant pipe and the outside air taken in around the fins. The air volume of the air flowing between the fins and passing by the blower 6 is increased and adjusted, and the amount of heat exchange is increased and adjusted. The air refrigerant heat exchanger 7 is an example of an evaporator that evaporates the refrigerant.

  A water refrigerant heat exchanger 8 is installed on the base 17 at the lower part of the blower chamber 15. The water-refrigerant heat exchanger 8 is housed and installed in a rectangular parallelepiped storage container 12 in a state covered with a heat insulating material. The water-refrigerant heat exchanger 8 is bent so that it can be stored in the storage container 12 with a long water pipe and a long refrigerant pipe in close contact with each other. In the water refrigerant heat exchanger 8, heat is exchanged between the refrigerant in the refrigerant pipe and the water in the water pipe. In the water refrigerant heat exchanger 8, water is heated. The configuration of the water refrigerant heat exchanger 8 will be described later.

  The outlet portion of the compressor 2 is connected to the refrigerant inlet portion of the water refrigerant heat exchanger 8 via the discharge pipe 5. The refrigerant outlet portion of the water refrigerant heat exchanger 8 is connected to the inlet portion of the expansion valve 10 in the machine chamber 14 via a refrigerant pipe. The outlet part of the expansion valve 10 is connected to the refrigerant inlet part of the air refrigerant heat exchanger 7 via a refrigerant pipe. The refrigerant outlet portion of the air refrigerant heat exchanger 7 is connected to the inlet portion of the compressor 2 via the suction pipe 4. Other refrigerant circuit components may be attached in the middle of each refrigerant pipe.

  In the upper part of the machine room 14, an electrical product storage box 9 is installed. An electronic substrate is stored in the electrical product storage box 9. On the electronic board, electronic parts, electric parts, and the like constituting each module for driving and controlling the compressor 2, the expansion valve 10, the blower 6, and the like are attached. Each module is controlled as follows, for example. The rotation speed of the motor of the compressor 2 is changed to a rotation speed of about several tens rps (Hz) to one hundred rps (Hz). The opening degree of the expansion valve 10 is changed. The rotation speed of the blower 6 is changed to a rotation speed of about several hundred rpm to 1,000 rpm. The electrical product storage box 9 is provided with a terminal block 9a for connecting external electrical wiring. As shown in FIGS. 2 and 3, a service panel 27 for protecting the terminal block 9a and a water inlet valve 28 and a hot water outlet valve 29, which will be described later, is attached to the right side surface portion 19b.

A refrigerant is sealed in a sealed space of a refrigerant circuit included in the heat pump device 1. The refrigerant may be, for example, a CO ₂ refrigerant.

  Next, the water circuit of the heat pump device 1 and the hot water storage device 33 will be described. As shown in FIG. 1, a water circuit component including an internal pipe 30 and an internal pipe 31 is incorporated in the machine room 14. On the right side of the base 17, both are provided side by side so that the water inlet valve 28 is on the lower side and the hot water outlet valve 29 is on the upper side. The internal pipe 30 connects between the water inlet valve 28 and the water inlet portion of the water refrigerant heat exchanger 8. The internal pipe 31 connects between the hot water outlet portion of the water refrigerant heat exchanger 8 and the hot water outlet valve 29.

  As shown in FIG. 4, the heat pump device 1 and the hot water storage device 33 constitute a heat pump hot water supply system. The hot water storage device 33 includes a hot water storage tank 34 having a capacity of, for example, several hundred liters, and a water pump 35 for sending water in the hot water storage tank 34 to the heat pump device 1. The heat pump device 1 and the hot water storage device 33 are connected via an external tube 36, an external tube 37, and electrical wiring (not shown).

  The lower part of the hot water storage tank 34 is connected to the inlet of the water pump 35 via a pipe 38. The external pipe 36 connects between the outlet of the water pump 35 and the water inlet valve 28 of the heat pump device 1. The external pipe 37 connects between the hot water outlet valve 29 of the heat pump device 1 and the hot water storage device 33. The external pipe 37 can communicate with the upper part of the hot water storage tank 34 via a pipe 39 in the hot water storage device 33.

  The hot water storage device 33 further includes a mixing valve 40. Connected to the mixing valve 40 are a hot water supply pipe 41 branched from a pipe 39, a water supply pipe 42 through which water supplied from a water source such as water supply passes, and a hot water supply pipe 43 through which hot water supplied to the user passes. Yes. The mixing valve 40 adjusts the hot water supply temperature by adjusting the mixing ratio of hot water flowing from the hot water supply pipe 41, that is, high-temperature water, and water flowing from the water supply pipe 42, that is, low-temperature water. The hot water mixed by the mixing valve 40 passes through the hot water supply pipe 43 and is sent to a user terminal such as a bathtub, a shower, a faucet, or a dishwasher. A water supply pipe 44 branched from the water supply pipe 42 is connected to the lower part of the hot water storage tank 34. The water flowing from the water supply pipe 44 is stored below the hot water storage tank 34.

  Next, a characteristic configuration of the heat pump device 1 according to the first embodiment will be described. The heat pump device 1 according to the first embodiment is characterized by the configuration of the water-refrigerant heat exchanger 8. FIG. 5 is a diagram for explaining a main part of the water-refrigerant heat exchanger 8 of the first embodiment. The water refrigerant heat exchanger 8 includes a water pipe 21 and a refrigerant pipe 22. The water pipe 21 and the refrigerant pipe 22 are circular pipes made of a metal such as a copper material. Low-temperature water sent from the hot water storage tank 34 circulates in the water pipe 21. In addition, a high-temperature and high-pressure refrigerant sent from the compressor 2 flows through the refrigerant pipe 22.

  The water-refrigerant heat exchanger 8 is bent so that it can be stored in the storage container 12 with the water pipe 21 and the refrigerant pipe 22 in close contact with each other. FIG. 5 is an enlarged view of one end side of the close contact portion in the water / refrigerant heat exchanger 8 where the water pipe 21 and the refrigerant pipe 22 are in close contact with each other. In addition, since the other end side of the contact part has the same shape as the one end side of the contact part shown in FIG.

  FIG. 6 is a view for explaining the configuration of the water piping of the water-refrigerant heat exchanger 8. In FIG. 6, the refrigerant pipe 22 is not shown in order to illustrate the configuration of the water pipe 21. In the water pipe 21, a plurality of continuous spiral grooves 21b are formed on the outer peripheral surface of the pipe. The spiral groove 21b is an example of the first spiral groove of the present invention. The number of spiral grooves is not particularly limited. In the example of the water refrigerant heat exchanger 8 shown in FIG. 5, two spiral grooves 21 b are formed in the water pipe 21.

  The refrigerant pipe 11 branches into a plurality of circular pipes in the middle so that a plurality of parallel flow paths are formed. In the example of the water refrigerant heat exchanger 8 shown in FIG. 5, the refrigerant pipe 22 is branched into two refrigerant pipes. Each branched refrigerant pipe 22 is joined by brazing or the like in a spirally wound state along two spiral grooves 21 b formed on the outer peripheral surface of the water pipe 21.

  The water refrigerant heat exchanger 8 includes an air pipe 23 inside the water pipe 21. The air pipe 23 is a hollow circular pipe containing air inside, and has an outer diameter smaller than the inner diameter of the water pipe 21. The air pipe 23 is made of a metal such as a copper material, and has a spiral groove 23b formed on the outer peripheral surface thereof. The spiral groove 23b is an example of the second spiral groove of the present invention. In the example of the water-refrigerant heat exchanger 8 shown in FIG. 5, the winding direction of the spiral groove 23b is configured to be opposite to the winding direction of the spiral groove 21b.

  The air pipe 23 is inserted so as to pass through the position of the central axis of the water pipe 21 in the entire region of the water pipe 21 around which the refrigerant pipe 22 is wound. The end of the air pipe 23 is configured as an open end 23 a and protrudes from the take-out part 21 a of the water pipe 21 to the outside. The take-out part 21 a is filled with a gap with the air pipe 23 by brazing or the like so that water does not leak from the gap with the air pipe 23. The water-refrigerant heat exchanger 8 has the same configuration of the open end 23a as that described above at the other end.

  The water refrigerant heat exchanger 8 according to Embodiment 1 configured as described above can achieve the following operational effects.

  The refrigerant pipe 22 is spirally wound around the outer peripheral surface of the water pipe 21. For this reason, the water flowing near the central axis of the water pipe 21 may not be able to efficiently exchange heat with the refrigerant flowing through the refrigerant pipe 22. In the water refrigerant heat exchanger 8 of the first embodiment, the air pipe 23 is inserted along the central axis of the water pipe 21. According to such a configuration, water is prevented from flowing near the central axis of the water pipe 21 having low heat exchange efficiency, so that the heat exchange efficiency is improved. Moreover, since the inside of the air pipe 23 is filled with air, heat radiation from the air pipe 23 to the outside is suppressed.

  The winding direction of the spiral groove 23b is configured to be opposite to the winding direction of the spiral groove 21b. For this reason, the water flowing through the water pipe 21 circulates while being vigorously stirred as the flow along the spiral groove 21b interferes with the flow along the spiral groove 23b. Thereby, since heat can be efficiently given to the water flowing through the water pipe 21, the heating efficiency of the water flowing through the water pipe 21 can be increased.

  In the water refrigerant heat exchanger 8 of the first embodiment, an air pipe 23 is arranged inside a water pipe 21 having a pressure lower than that of the refrigerant pipe 22. Since the water pipe 21 has a lower pressure than the refrigerant pipe 22, it is not necessary to make the structure of the air pipe 23 capable of withstanding high pressure. For this reason, the water-refrigerant heat exchanger 8 of Embodiment 1 can improve the heat exchange efficiency with a simple configuration.

  By the way, the water-refrigerant heat exchanger 8 of Embodiment 1 can employ | adopt the structure deform | transformed as follows. It should be noted that the following modification examples can also be adopted in other embodiments described later.

  The winding direction of the spiral groove 23 b of the air pipe 23 may be configured to be the same direction as the winding direction of the spiral groove 21 b of the water pipe 21. In this case, the water flowing through the water pipe 21 flows while vigorously swirling along the spiral grooves 21b and 23b in the same direction, so that stirring of the water is promoted. Thereby, since heat can be efficiently given to the water flowing through the water pipe 21, the heating efficiency of the water flowing through the water pipe 21 can be increased.

  The air pipe 23 may be configured by twisting together a plurality of pipes in a spiral shape. According to such a structure, since a spiral groove is formed in the contact part of several piping, it becomes possible to stir the water of the water piping 21 effectively.

  In addition, when the air piping 23 is comprised by several piping, it can be comprised so that the winding direction of the spiral groove formed in the air piping 23 may turn into the direction opposite to the winding direction of the spiral groove 21b. According to such a configuration, the water flowing through the water pipe 21 circulates while being vigorously agitated by interference between the flow along the spiral groove formed in the air pipe 23 and the flow along the spiral groove 21b. Thereby, since heat can be efficiently given to the water flowing through the water pipe 21, the heating efficiency of the water flowing through the water pipe 21 can be increased.

  Moreover, when the air piping 23 is comprised by several piping, it can also comprise so that the winding direction of the spiral groove formed in the air piping 23 may become the same direction as the winding direction of the spiral groove 21b. According to such a configuration, the water flowing through the water pipe 21 circulates while vigorously swirling along the spiral groove and the spiral groove 21b formed in the air pipe 23, so that stirring of the water is promoted. Thereby, since heat can be efficiently given to the water flowing through the water pipe 21, the heating efficiency of the water flowing through the water pipe 21 can be increased.

  The water pipe 21 may be configured without the spiral groove 21b. The air pipe 23 may be configured without the spiral groove 23b.

  The air pipe 23 may be configured to be inserted into a partial area of the water pipe 21 around which the refrigerant pipe 22 is wound.

Embodiment 2. FIG.
Next, Embodiment 2 will be described with reference to FIG. In the description of the second embodiment, the difference from the first embodiment will be mainly described, and the description of the same or corresponding parts will be simplified or omitted.

  FIG. 7 is a diagram for explaining a main part of the water-refrigerant heat exchanger 8 according to the second embodiment. In the water-refrigerant heat exchanger 8 shown in this figure, both ends of the air pipe 23 are configured as closed ends 23c, and protrude from the take-out portion 21a of the water pipe 21 to the outside. The closed end 23c is closed by flat crushing and brazing.

  The air inside the air pipe 23 is heated by the heat of the refrigerant. In the water-refrigerant heat exchanger 8 of the second embodiment, air inside the air pipe 23 can be prevented from being released to the outside, so that the amount of heat released from the water-refrigerant heat exchanger 8 can be reduced. Thereby, since the heat exchange efficiency of the water refrigerant heat exchanger 8 can be further increased, the heating efficiency of the water flowing through the water pipe 21 can be increased.

  By the way, in the water refrigerant heat exchanger 8 of Embodiment 2, you may comprise the one end among the both ends of the air piping 23 as the obstruction | occlusion end 23c, and the other end as the open end 23a. If at least one end of both ends of the air pipe 23 is closed, the air circulation in the air pipe 23 can be suppressed, so that the heat exchange efficiency can be increased.

Embodiment 3 FIG.
Next, Embodiment 3 will be described with reference to FIG. In the description of the third embodiment, the difference from the first embodiment will be mainly described, and the description of the same or corresponding parts will be simplified or omitted.

  FIG. 8 is a diagram for explaining a main part of the water-refrigerant heat exchanger 8 according to the third embodiment. In the water-refrigerant heat exchanger 8 shown in this figure, both ends of the air pipe 23 are configured as closed ends 23 c and are arranged inside the water pipe 21. The closed end 23 c is blocked by flat crushing and brazing to prevent water in the water pipe 21 from flowing into the air pipe 23.

  According to the water-refrigerant heat exchanger 8 of the third embodiment, the configuration of the take-out portion 21a of the water pipe 21 is not required, so that the heat exchange efficiency can be increased with a simpler configuration.

  In addition, in the water-refrigerant heat exchanger 8 of Embodiment 3, the structure which arrange | positions one end of the air piping 23 in the inside of the water piping 21, and makes the other end protrude outside from the extraction part 21a may be employ | adopted.

Embodiment 4 FIG.
Next, Embodiment 4 will be described with reference to FIG. In the description of the fourth embodiment, the difference from the first embodiment will be mainly described, and the description of the same or corresponding parts will be simplified or omitted.

  FIG. 9 is a diagram for explaining a main part of the water-refrigerant heat exchanger 8 of the fourth embodiment. The water-refrigerant heat exchanger 8 shown in this figure includes a heat insulating member 24 in a part or all of the inside of the air pipe 23. For the heat insulating member 24, a material such as a urethane material having a high heat insulating effect can be used. According to such a configuration, the heat radiation from the water refrigerant heat exchanger 8 can be further suppressed, so that the heat exchange efficiency of the water refrigerant heat exchanger 8 can be further increased.

1 Heat Pump Device 2 Compressor 4 Suction Pipe 5 Discharge Pipe 6 Blower 7 Air Refrigerant Heat Exchanger 8 Water Refrigerant Heat Exchanger 9 Electric Refrigerant Heat Exchanger 9a Terminal Block 10 Expansion Valve 12 Storage Container 14 Machine Room 15 Blower Room 16 Partition Plate 17 Base 18 Front panel 18a Front side 18b Left side 19 Back panel 19a Rear side 19b Right side 20 Top panel 21 Water pipe 21a Extraction part 21b Spiral groove 22 Refrigerant pipe 23 Air pipe 23a Open end 23b Spiral groove 23c Closed end 24 Heat insulation member 27 Service panel 28 Water inlet valve 29 Hot water outlet valve 30, 31 Internal pipe 33 Hot water storage device 34 Hot water storage tank 35 Water pump 36, 37 External pipe 38, 39 pipe 40 Mixing valve 41 Hot water pipe 42 Hot water pipe 43 Hot water pipe 44 Hot water pipe

The present invention includes a water refrigerant heat exchanger including a water pipe through which water flows and a refrigerant pipe through which a refrigerant flows, and performs heat exchange between water flowing through the water pipe and a refrigerant flowing through the refrigerant pipe, and It is applied to a heat pump device using a water refrigerant heat exchanger. The refrigerant pipe of the water refrigerant heat exchanger is spirally wound around the outer peripheral surface of the water pipe. Moreover, the air piping which contains air inside is arrange | positioned in the area | region where refrigerant | coolant piping was wound among the water piping of a water refrigerant | coolant heat exchanger. At least one of the end portions of the air pipe protrudes from a take-out portion provided on the side surface of the water pipe. The heat pump device exchanges heat between the water refrigerant heat exchanger configured as described above, a compressor that compresses the refrigerant, a decompression device that decompresses the refrigerant, and the refrigerant decompressed by the decompression device and the outside air. An evaporator.

Claims (12)

In a water-refrigerant heat exchanger comprising a water pipe through which water flows and a refrigerant pipe through which refrigerant flows, and performing heat exchange between water flowing through the water pipe and refrigerant flowing through the refrigerant pipe,
The refrigerant pipe is spirally wound around the outer peripheral surface of the water pipe,
The water refrigerant heat exchanger, wherein an air pipe containing air is disposed in an area of the water pipe where the refrigerant pipe is wound. At least one of the ends of the air pipe is configured as an open end,
The water refrigerant heat exchanger according to claim 1, wherein the open end is configured to protrude to the outside of the water pipe. At least one of the ends of the air pipe is configured as a closed end,
The water refrigerant heat exchanger according to claim 1, wherein the closed end is configured to protrude to the outside of the water pipe. At least one of the ends of the air pipe is configured as a closed end,
The water refrigerant heat exchanger according to claim 1 or 2, wherein the closed end is disposed inside the water pipe. The water pipe includes a first spiral groove formed in a spiral shape on the outer peripheral surface,
The refrigerant pipe is spirally wound along the first spiral groove,
The water refrigerant heat exchanger according to any one of claims 1 to 4, wherein the air pipe includes a second spiral groove formed in a spiral shape on an outer peripheral surface.   The water refrigerant heat exchanger according to claim 5, wherein the winding direction of the second spiral groove is opposite to the winding direction of the first spiral groove.   The water refrigerant heat exchanger according to claim 5, wherein the winding direction of the second spiral groove is the same as the winding direction of the first spiral groove.   The water refrigerant heat exchanger according to any one of claims 1 to 4, wherein the air pipe is configured by a plurality of pipes being spirally twisted together. The water pipe includes a first spiral groove formed in a spiral shape on the outer peripheral surface,
The refrigerant pipe is spirally wound along the first spiral groove,
The water refrigerant heat exchanger according to claim 8, wherein a winding direction of the air pipe is opposite to a winding direction of the first spiral groove. The water pipe includes a first spiral groove formed in a spiral shape on the outer peripheral surface,
The refrigerant pipe is spirally wound along the first spiral groove,
The water refrigerant heat exchanger according to claim 8, wherein the winding direction of the air pipe is the same direction as the winding direction of the first spiral groove.   The water refrigerant heat exchanger according to any one of claims 1 to 10, wherein a heat insulating material is disposed inside the water pipe. A compressor for compressing the refrigerant;
The water-refrigerant heat exchanger according to any one of claims 1 to 11, wherein heat is exchanged between the refrigerant compressed by the compressor and water.
A decompression device for decompressing the refrigerant;
An evaporator for exchanging heat between the refrigerant decompressed by the decompression device and the outside air;
A heat pump device comprising:

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