JP2015102290A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger capable of performing a hot water supply operation with a high efficiency as compared with a heating operation.SOLUTION: A heat exchanger includes: refrigerant piping 61 in which a refrigerant circulating in a heat pump cycle flows; piping 71 for hot water supply in which water exchanging heat with the refrigerant flowing in the refrigerant piping 61 and which is connected to a hot water supply terminal; and piping 81 for heating in which a fluid to be heated exchanging heat with the refrigerant flowing in the refrigerant piping 61 flows and which is connected to a heating apparatus. The refrigerant piping 61 is wound helically around an outer peripheral surface 71a of the piping 71 for hot water supply. The piping 81 for heating comes into contact with the refrigerant piping 61 from the outer peripheral side on the opposite side to the piping 71 for hot water supply arranged on the inner peripheral side of the refrigerant piping 61.

Description

  The present invention generally relates to a heat exchanger, and more particularly to a heat exchanger used in a heat pump hot water heater.

  Regarding a conventional heat exchanger, for example, Japanese Patent Application Laid-Open No. 2009-243747 discloses a heat pump that aims to transmit more heat of refrigerant to water in a floor heating pipe than water in a hot water supply pipe as a result. A hot water heater is disclosed (Patent Document 1). In the heat exchanger of the heat pump hot water heater disclosed in Patent Document 1, the refrigerant pipe through which the refrigerant circulated in the heat pump cycle flows, and the floor heating pipe through which the water or antifreeze circulated through the floor heating circuit flows. The hot water supply pipes through which water supplied to the hot water supply circuit circulates are repeatedly contacted in the order listed.

JP 2009-243747 A

  As disclosed in Patent Document 1 described above, a heat exchanger that heats a fluid to be heated that flows through a heating pipe and water that flows through a hot water supply pipe by a refrigerant that circulates in a heat pump cycle is known.

  In such a heat exchanger, the use frequency is generally higher in the hot water supply operation than in the heating operation. In the heating operation, once the heated fluid circulating in the heating circuit is heated once, the heat transfer from the refrigerant to the heated fluid is sufficient to keep the heated fluid warm. For these reasons, there is a need for a heat exchanger that can perform hot water supply operation more efficiently than heating operation.

  In addition, in the heat exchanger of the heat pump hot water supply / air heater disclosed in Patent Document 1 described above, the refrigerant pipe, the floor heating pipe, and the hot water supply pipe are repeatedly contacted and stacked. When the pipes laminated in this way are bent into a track shape or a wave shape and stored in a heat exchanger, there may be a restriction on the bending radius of the pipes. In order to reduce the size of the heat exchanger, improvement of the piping structure is required.

  Accordingly, one object of the present invention is to solve the above-described problem, and to provide a heat exchanger capable of performing a hot water supply operation with higher efficiency than the heating operation. Another object of the present invention is to solve the above-mentioned problems and to provide a heat exchanger that can be miniaturized.

  A heat exchanger according to one aspect of the present invention includes a refrigerant pipe through which a refrigerant circulating in a heat pump cycle flows, water for heat exchange with the refrigerant flowing through the refrigerant pipe, and a hot water supply pipe connected to a hot water supply terminal; A fluid to be heated that exchanges heat with the refrigerant flowing through the refrigerant pipe flows, and includes a heating pipe connected to the heating device. The refrigerant pipe is spirally wound around the outer peripheral surface of the hot water supply pipe. The heating pipe contacts the refrigerant pipe from the outer peripheral side opposite to the hot water supply pipe disposed on the inner peripheral side of the refrigerant pipe.

  According to the heat exchanger configured in this way, the heat exchange between the refrigerant flowing through the refrigerant pipe and the water flowing through the hot water supply pipe is more performed than the heat exchange between the refrigerant flowing through the refrigerant pipe and the heated fluid flowing through the heating pipe. Heat exchange between them can be promoted. Thereby, compared with heating operation, the heat exchanger which can perform hot water supply operation with high efficiency is realizable.

  Preferably, the heating pipe extends in parallel with the hot water supply pipe. According to the heat exchanger comprised in this way, the heat exchanger which can perform hot water supply operation with high efficiency compared with heating operation is realizable.

  Preferably, the hot water supply pipe has a bellows shape in which a concave portion extending spirally is formed on the outer peripheral surface thereof. The refrigerant pipe is wound along the recess. According to the heat exchanger comprised in this way, the heat exchange between the refrigerant | coolant which flows through refrigerant | coolant piping, and the water which flows through the hot water supply piping can further be accelerated | stimulated.

  A heat exchanger according to another aspect of the present invention includes a refrigerant pipe through which a refrigerant circulating in a heat pump cycle flows, water for heat exchange with the refrigerant flowing through the refrigerant pipe, and a hot water supply pipe connected to a hot water supply terminal, A fluid to be heated that exchanges heat with the refrigerant flowing through the refrigerant pipe flows, and includes a heating pipe connected to the heating device. The hot water supply pipe has a flat frame shape. The refrigerant pipe is wound around the outer surface of the hot water supply pipe. The heating pipe contacts the refrigerant pipe from the outer side opposite to the hot water supply pipe arranged inside the refrigerant pipe.

  According to the heat exchanger configured as described above, a structure in which the hot water supply pipe and the heating pipe are thermally coupled to the refrigerant pipe can be configured in a compact manner. Thereby, a heat exchanger that can be miniaturized can be realized.

  Preferably, the refrigerant pipe includes a plurality of branch pipes through which the refrigerant flows. The plurality of shunt pipes are wound around the outer surface of the hot water supply pipe while being connected in parallel.

  According to the heat exchanger configured as described above, the refrigerant pipe can be easily routed, so that the heat exchanger can be further downsized.

  As described above, according to the present invention, it is possible to provide a heat exchanger capable of performing a hot water supply operation with higher efficiency than the heating operation. Moreover, according to this invention, the heat exchanger which can attain size reduction can be provided.

It is a figure which shows the circuit structure of the heat pump type hot-water supply heater provided with the water heat exchanger in Embodiment 1 of this invention. It is a figure which shows the piping structure of the water heat exchanger in FIG. It is a figure which shows the piping for hot water supply among the piping structures of the water heat exchanger in FIG. It is a figure which shows the hot water supply piping and refrigerant | coolant piping among the piping structures of the water heat exchanger in FIG. It is a figure which shows the piping structure of the water heat exchanger in Embodiment 2 of this invention. It is a figure which shows the piping for hot water supply among the piping structures of the water heat exchanger in FIG. It is a figure which shows the hot water supply piping and refrigerant | coolant piping among the piping structures of the water heat exchanger in FIG. It is a figure which shows the piping structure of the water heat exchanger in Embodiment 3 of this invention. It is a figure which shows the piping structure of the water heat exchanger seen from the direction shown by arrow IX in FIG. It is sectional drawing which shows the piping for hot water supply among the piping structures of the water heat exchanger in FIG. It is a figure which shows the hot water supply piping and refrigerant | coolant piping among the piping structures of the water heat exchanger in FIG. It is a figure which shows the piping structure of the water heat exchanger seen from the direction shown by the arrow XII in FIG.

  Embodiments of the present invention will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are denoted by the same reference numerals.

(Embodiment 1)
FIG. 1 is a diagram showing a circuit configuration of a heat pump type hot water heater provided with a water heat exchanger according to Embodiment 1 of the present invention.

  Referring to FIG. 1, heat pump hot water heater 10 has a hot water supply function and a heating function. The heating function means a function for warming residential facilities using a heated fluid to be heated. In the present embodiment, the heat pump hot water heater 10 has a floor heating function for heating the floor, but is not limited to this.

  The heat pump hot water heater 10 constitutes a heat pump cycle as its circuit configuration, and includes a refrigeration circuit 21 through which a refrigerant circulates, a hot water supply circuit 31 through which water circulates, and a floor heating circuit 41 through which a fluid to be heated circulates. . The water flowing through the hot water supply circuit 31 and the heated fluid flowing through the floor heating circuit 41 are heated by heat exchange with the refrigerant circulating in the refrigeration circuit 21.

The refrigeration circuit 21 forms a circulation path through which the refrigerant circulates. As the refrigerant, for example, HC (hydrocarbon: isobutane, propane, etc.), HFC (hydrofluorocarbon: R410A, R32, etc.), and carbon dioxide (CO ₂ ) are used.

  The refrigeration circuit 21 includes an outdoor air (air-refrigerant) heat exchanger 25, a water (water, heated fluid-refrigerant) heat exchanger 51, a compressor 22, and an expansion valve 24. The outdoor air heat exchanger 25 performs heat exchange between the refrigerant circulating in the refrigeration circuit 21 and the air in the outdoor space. The water heat exchanger 51 performs heat exchange between the refrigerant circulating in the refrigeration circuit 21 and the water flowing through the hot water supply circuit 31 and / or the heated fluid flowing through the floor heating circuit 41.

  On the path of the refrigeration circuit 21, the compressor 22 is disposed between the outdoor air heat exchanger 25 and the water heat exchanger 51. The compressor 22 compresses the refrigerant sent from the outdoor air heat exchanger 25 and sends it out toward the water heat exchanger 51. On the path of the refrigeration circuit 21, the expansion valve 24 is disposed between the water heat exchanger 51 and the outdoor air heat exchanger 25. The expansion valve 24 is disposed on the opposite side of the compressor 22 with the outdoor air heat exchanger 25 and the water heat exchanger 51 interposed therebetween. The expansion valve 24 decompresses the refrigerant sent from the water heat exchanger 51 and sends it out toward the outdoor air heat exchanger 25.

  On the path of the hot water supply circuit 31, the above-described water heat exchanger 51 is provided. One end of the hot water supply circuit 31 (upstream end of the water flow in the hot water supply circuit 31) is provided with a water connection port 35 for connecting the hot water supply circuit 31 to a water supply source, and the other end of the hot water supply circuit 31 (hot water supply circuit 31). The downstream end of the water flow is connected to a hot water supply terminal 34 such as a shower or a bathtub. In addition, it is not restricted to such a circuit structure, On the path | route of the hot water supply circuit 31, the hot water storage tank for storing warm water may be provided.

  The floor heating circuit 41 forms a circulation path through which the fluid to be heated circulates. As the fluid to be heated, for example, water or antifreeze (brine) is used.

  On the path of the floor heating circuit 41, the above-described water heat exchanger 51, the floor heating device 42, and the circulation pump 43 are provided. The floor heating device 42 is a device that realizes floor heating by circulating heated fluid to be heated under the floor. The circulation pump 43 is a pump for circulating the heated fluid between the water heat exchanger 51 and the floor heating device 42. In addition, it is not restricted to such a circuit structure, On the path | route of the floor heating circuit 41, another heat sources, such as a gas heat source machine, may further be provided.

  The refrigerant flow in the refrigeration circuit 21 will be described. First, the refrigerant is adiabatically compressed by the compressor 22. As the refrigerant is compressed, the pressure and temperature of the refrigerant rise to become high-temperature and high-pressure superheated steam, and the refrigerant is discharged from the compressor 22. The refrigerant that has flowed out of the compressor 22 flows into the water heat exchanger 51. In the water heat exchanger 51, the refrigerant dissipates heat to the water flowing through the hot water supply circuit 31 and / or the heated fluid flowing through the floor heating circuit 41, and is condensed (liquefied) by being cooled.

  The water heated in the water heat exchanger 51 is supplied to the hot water supply terminal 34 as warm water. The heated fluid heated in the water heat exchanger 51 is supplied to the floor heating device 42.

  The refrigerant that has flowed out of the water heat exchanger 51 goes to the expansion valve 24. In the expansion valve 24, the refrigerant in the supercooled liquid state is squeezed and expanded, and the temperature and the pressure are reduced to become the low temperature and low pressure gas-liquid mixed steam. The refrigerant flowing out of the expansion valve 24 goes to the outdoor air heat exchanger 25. The refrigerant in the gas-liquid mixed state sent from the expansion valve 24 is evaporated by absorbing heat from the air in the outdoor space in the outdoor air heat exchanger 25. Thereafter, the gas-phase refrigerant is adiabatically compressed again in the compressor 22.

  In accordance with such a cycle, the refrigerant continuously repeats the compression, condensation, throttle expansion, and evaporation state changes.

  As shown by arrows in FIG. 1, in the water heat exchanger 51, the refrigerant flow direction in the refrigerant circuit 21, the water flow direction in the hot water supply circuit 31, and the heated fluid flow direction in the floor heating circuit 41. Are generally set in the opposite direction.

  FIG. 2 is a diagram showing a piping structure of the water heat exchanger in FIG. FIG. 3 is a view showing a hot water supply pipe in the pipe structure of the water heat exchanger in FIG. 2. 4 is a diagram showing a hot water supply pipe and a refrigerant pipe in the pipe structure of the water heat exchanger in FIG. Then, the piping structure of the water heat exchanger 51 with which the heat pump type hot water heater 10 in FIG. 1 is provided will be described.

  2 to 4, the water heat exchanger 51 includes a hot water supply pipe 71, a refrigerant pipe 61, and a heating pipe 81.

  Water (hot water) flowing through the hot water supply circuit 31 in FIG. 1 flows through the hot water supply pipe 71. The hot water supply pipe 71 forms the hot water supply circuit 31 in the water heat exchanger 51. The refrigerant circulating in the refrigeration circuit 21 in FIG. The refrigerant pipe 61 constitutes the refrigeration circuit 21 in the water heat exchanger 51. A heated fluid that circulates through the floor heating circuit 41 in FIG. 1 flows through the heating pipe 81. The heating pipe 81 forms a floor heating circuit 41 in the water heat exchanger 51.

  The hot water supply pipe 71 and the heating pipe 81 are thermally coupled to the refrigerant pipe 61.

The hot water supply pipe 71 is made of a pipe material (for example, copper). The hot water supply pipe 71 has an outer peripheral surface 71a. The hot water supply pipe 71 is arranged in a plane by extending in a track shape or a meander shape. (In the drawing, the hot water supply pipe 71 is shown in a straight line.)
Refrigerant piping 61 is formed from a pipe material (for example, copper). The refrigerant pipe 61 is spirally wound around the outer peripheral surface 71 a of the hot water supply pipe 71. The refrigerant pipe 61 extends along the extending direction of the hot water supply pipe 71 while circling on the outer peripheral surface 71 a of the hot water supply pipe 71. While the refrigerant pipe 61 circulates on the outer peripheral surface 71a of the hot water supply pipe 71, it continuously contacts the outer peripheral surface 71a. In addition, there is a possibility that the non-contact portion may be generated due to the production of the refrigerant pipe 61 slightly floating from the outer peripheral surface 71a due to a production error. However, including such a state, the refrigerant pipe 61 is continuously provided on the outer peripheral surface. It is said that it is in contact with 71a. The hot water supply pipe 71 is disposed on the inner peripheral side of the spirally extending refrigerant pipe 61.

  Particularly in the present embodiment, the refrigerant pipe 61 is spirally wound around the outer peripheral surface 71a of the hot water supply pipe 71 so as to provide a predetermined interval in the direction in which the hot water supply pipe 71 extends. That is, the refrigerant pipes 61 are provided so that the refrigerant pipes 61 do not contact each other at positions adjacent to each other in the direction in which the hot water supply pipe 71 extends. According to such a configuration, heat exchange between the refrigerant pipes 61 in the direction in which the hot water supply pipe 71 extends is suppressed, so that the refrigerant pipe 61 and the hot water supply pipe 71 and the heating pipe 81 are more Heat can be exchanged efficiently.

  In addition, it is not restricted to such a structure, The refrigerant | coolant piping 61 may be helically wound around the outer peripheral surface 71a of the hot water supply piping 71 so that it may mutually contact in the direction where the hot water supply piping 71 is extended.

  The heating pipe 81 is made of a pipe material (for example, copper). The heating pipe 81 is arranged on the outer peripheral side of the refrigerant pipe 61 extending in a spiral shape. The heating pipe 81 is in contact with the refrigerant pipe 61 from the outer peripheral side opposite to the hot water supply pipe 71 arranged on the inner peripheral side with respect to the refrigerant pipe 61. The heating pipe 81 extends in parallel with the hot water supply pipe 71. The heating pipe 81 is intermittently in contact with the refrigerant pipe 61 in the extending direction.

  The heating pipe 81 may be provided on the side surface side of the hot water supply pipe 71 arranged in a plane, or may be provided in the same plane as the hot water supply pipe 71 arranged in a plane.

  In the present embodiment, the heating pipe 81 is provided as a branch pipe 81A and a branch pipe 81B through which the fluid to be heated flows. The diverter pipe 81A and the diverter pipe 81B are arranged on the outer periphery of the hot water supply pipe 71 at intervals in the circumferential direction. Only one heating pipe 81 may be provided, or a plurality of three or more pipes may be provided. Note that the heating pipe 81 is provided as the diversion pipes 81A and 81B in the water heat exchanger 51. For example, at the position connected to the circulation pump 43 in FIG. A pipe 81 is provided.

  According to such a configuration, the contact length between the refrigerant pipe 61 and the hot water supply pipe 71 is longer than the contact length between the refrigerant pipe 61 and the heating pipe 81 per fixed length of the refrigerant pipe 61. Thus, heat exchange between the refrigerant flowing through the refrigerant pipe 61 and the water flowing through the hot water supply pipe 71 is promoted more than the heat exchange between the refrigerant flowing through the refrigerant pipe 61 and the heated fluid flowing through the heating pipe 81. Can be made. As a result, the hot water supply operation can be performed with higher efficiency than the heating operation.

  When the structure of the water heat exchanger 51 according to Embodiment 1 of the present invention described above is described together, the water heat exchanger 51 as the heat exchanger in the present embodiment has a refrigerant circulating in the heat pump cycle. Flowing refrigerant pipe 61, water that exchanges heat with refrigerant flowing through refrigerant pipe 61 flows, hot water supply pipe 71 connected to hot water supply terminal 34, heated fluid that exchanges heat with refrigerant flowing through refrigerant pipe 61, and heating And a heating pipe 81 connected to a floor heating device 42 as a device. The refrigerant pipe 61 is spirally wound around the outer peripheral surface 71 a of the hot water supply pipe 71. The heating pipe 81 contacts the refrigerant pipe 61 from the outer peripheral side opposite to the hot water supply pipe 71 disposed on the inner peripheral side with respect to the refrigerant pipe 61.

  According to the water heat exchanger 51 according to the first embodiment of the present invention configured as described above, a hot water supply operation that is frequently used outside the winter period is highly efficient without increasing the pipe length of the hot water supply pipe 71. Can be done. In addition, regarding the heating operation, the heated fluid can be supplied to the floor heating device 42 using the same heat exchanger as in the hot water supply operation. In this case, for example, the efficiency of the heating operation can be improved by using another heat source in combination.

(Embodiment 2)
FIG. 5 is a diagram showing a piping structure of a water heat exchanger according to Embodiment 2 of the present invention. FIG. 6 is a view showing a hot water supply pipe in the pipe structure of the water heat exchanger in FIG. 5. FIG. 7 is a view showing a hot water supply pipe and a refrigerant pipe in the pipe structure of the water heat exchanger in FIG.

  The water heat exchanger in the present embodiment basically has the same structure as the water heat exchanger in the first embodiment. Hereinafter, the description of the overlapping structure will not be repeated.

  With reference to FIGS. 5 to 7, the water heat exchanger in the present embodiment includes a hot water supply pipe 73, a refrigerant pipe 63 and a heating pipe 83.

  The hot water supply pipe 73 is formed of a bellows-like pipe material (as a material, for example, copper). The hot water supply pipe 73 has an outer peripheral surface 73a. The hot water supply pipe 73 is formed with a concave portion 74 extending spirally on the outer peripheral surface 73a. The refrigerant pipe 63 is formed from a pipe material. The refrigerant pipe 63 is spirally wound around the outer peripheral surface 73 a of the hot water supply pipe 73. In the present embodiment, the refrigerant pipe 63 is wound along the concave portion 74 that extends in a spiral shape. The heating pipe 83 is provided in the same form as the heating pipe 81 in the first embodiment.

  According to such a configuration, the heat exchange between the refrigerant flowing through the refrigerant pipe 63 and the water flowing through the hot water supply pipe 73 is further promoted by increasing the contact area between the refrigerant pipe 63 and the hot water supply pipe 73. be able to.

  According to the hydrothermal exchanger in Embodiment 2 of this invention comprised in this way, the effect as described in Embodiment 1 can be show | played similarly.

(Embodiment 3)
FIG. 8 is a diagram showing a piping structure of the water heat exchanger according to Embodiment 3 of the present invention. FIG. 9 is a diagram illustrating a piping structure of the hydrothermal exchanger as viewed from the direction indicated by the arrow IX in FIG. FIG. 10 is a cross-sectional view showing a hot water supply pipe in the pipe structure of the water heat exchanger in FIG. FIG. 11 is a diagram illustrating a hot water supply pipe and a refrigerant pipe in the pipe structure of the water heat exchanger in FIG. 8. FIG. 12 is a diagram showing the piping structure of the hydrothermal exchanger as seen from the direction indicated by the arrow XII in FIG.

  The water heat exchanger 55 in the present embodiment has basically the same structure as the water heat exchanger in the first embodiment. Hereinafter, the description of the overlapping structure will not be repeated.

  With reference to FIGS. 8 to 12, the water heat exchanger 55 in the present embodiment includes a hot water supply pipe 75, a refrigerant pipe 65, and a heating pipe 85.

  The hot water supply pipe 75 has a flat frame shape. In the present embodiment, the hot water supply pipe 75 has a rectangular parallelepiped casing shape as a whole. The hot water supply pipe 75 has a rectangular parallelepiped frame shape in which the length in the depth direction is smaller than the length in the vertical direction and the length in the horizontal direction in the front view. The hot water supply pipe 75 has an outer surface 75a. An example of a material for the hot water supply pipe 75 is copper.

  A supply port 78 and a discharge port 79 are formed in the hot water supply pipe 75. The supply port 78 and the discharge port 79 communicate with the internal space of the hot water supply pipe 75. The hot water supply pipe 75 has a plurality of partition walls 77. The plurality of partition walls 77 are arranged in the internal space of the hot water supply pipe 75 so as to be spaced apart from each other so that the flow path through which water flows between the supply port 78 and the discharge port 79 extends in a meander shape.

  Refrigerant piping 65 is formed from a pipe material (for example, copper). The refrigerant pipe 65 is wound around the outer surface 75 a of the hot water supply pipe 75. The refrigerant pipe 65 is wound around the outer surface 75a of the hot water supply pipe 75 a plurality of times. The refrigerant pipe 65 extends in the vertical direction while being wound around the outer surface 75 a of the hot water supply pipe 75. The hot water supply pipe 75 is disposed inside the refrigerant pipe 65 that is wound a plurality of times.

  Particularly in the present embodiment, the refrigerant pipe 65 is wound around the outer surface 75a of the hot water supply pipe 75 so as to provide a predetermined interval in the vertical direction in which the refrigerant pipe 65 extends as a whole. That is, the refrigerant pipes 65 are provided so that the refrigerant pipes 65 do not contact each other at positions adjacent in the vertical direction. According to such a configuration, heat exchange between the refrigerant pipes 65 in the vertical direction is suppressed, so heat exchange between the refrigerant pipe 65, the hot water supply pipe 75, and the heating pipe 85 is more efficiently performed. can do.

  In addition, it is not restricted to such a structure, The refrigerant | coolant piping 65 may be wound around the outer surface 75a of the hot water supply piping 75 so that it may mutually contact in the up-down direction where the refrigerant | coolant piping 65 extends as a whole.

  In the present embodiment, the refrigerant pipe 65 is provided as a branch pipe 65A and a branch pipe 65B through which the refrigerant flows. The diversion pipe 65A and the diversion pipe 65B are wound around the outer surface 75a of the hot water supply pipe 75 in a state of being connected in parallel. Only one refrigerant pipe 65 may be provided, or a plurality of three or more refrigerant pipes may be provided. The refrigerant pipe 65 is provided as the branch pipes 65A and 65B in the water heat exchanger 55. For example, in the position connected to the expansion valve 24 and the compressor 22 in FIG. The refrigerant pipe 65 is provided.

  The heating pipe 85 is formed of a pipe material (for example, copper). The heating pipe 85 is disposed outside the refrigerant pipe 65 that is wound a plurality of times. The heating pipe 85 is in contact with the refrigerant pipe 65 from the outer side opposite to the hot water supply pipe 75 arranged inside the refrigerant pipe 65. The heating pipe 85 extends in parallel with the refrigerant pipe 65. The heating pipe 85 is wound around the outer surface 75 a of the hot water supply pipe 75 via the refrigerant pipe 65.

  According to such a configuration, the hot water supply pipe 75 is provided in a flat frame shape corresponding to the appearance of the water heat exchanger 55, and the refrigerant pipe 65 and the heating pipe 85 are provided on the outer surface 75 a of the hot water supply pipe 75. By winding in order, a structure in which the hot water supply pipe 75 and the heating pipe 85 are thermally coupled to the refrigerant pipe 65 can be made compact.

  The structure of the water heat exchanger 55 according to Embodiment 3 of the present invention described above will be described together. The water heat exchanger 55 as the heat exchanger in the present embodiment has a refrigerant that circulates in the heat pump cycle. Flowing refrigerant pipe 65, water that exchanges heat with refrigerant flowing through refrigerant pipe 65 flows, hot water supply pipe 75 connected to hot water supply terminal 34, heated fluid that exchanges heat with refrigerant flowing through refrigerant pipe 65 flows, and heating And a heating pipe 85 connected to a floor heating device 42 as a device. The hot water supply pipe 75 has a flat frame shape. The refrigerant pipe 65 is wound around the outer surface 75 a of the hot water supply pipe 75. The heating pipe 85 comes into contact with the refrigerant pipe 65 from the outer side opposite to the hot water supply pipe 75 arranged inside the refrigerant pipe 65.

  According to the water heat exchanger 55 according to the third embodiment of the present invention configured as described above, the water heat exchanger 55 can be downsized.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention is mainly used for a heat exchanger provided in a heat pump hot water supply / room heater.

  DESCRIPTION OF SYMBOLS 10 Heat pump type hot water heater / heater, 21 Refrigeration circuit, 22 Compressor, 24 Expansion valve, 25 Outdoor air heat exchanger, 31 Hot water supply circuit, 34 Hot water supply terminal, 35 Water connection port, 41 Floor heating circuit, 42 Floor heating device, 43 Circulation pump, 51 Water heat exchanger, 61, 63, 65 Refrigerant pipe, 65A, 65B, 81A, 81B Branch pipe, 71, 73, 75 Hot water supply pipe, 71a, 73a outer peripheral surface, 74 recess, 75a outer surface, 77 Bulkhead, 78 supply port, 79 discharge port, 81, 83, 85 Heating piping.

Claims (5)

Refrigerant piping through which the refrigerant circulating in the heat pump cycle flows;
Water for heat exchange with the refrigerant flowing through the refrigerant pipe flows, and a hot water supply pipe connected to the hot water supply terminal,
A heated fluid that exchanges heat with the refrigerant flowing through the refrigerant pipe flows, and includes a heating pipe connected to the heating device,
The refrigerant pipe is spirally wound around an outer peripheral surface of the hot water supply pipe,
The heating pipe is a heat exchanger that contacts the refrigerant pipe from an outer peripheral side opposite to the hot water supply pipe disposed on the inner peripheral side of the refrigerant pipe.   The heat exchanger according to claim 1, wherein the heating pipe extends in parallel with the hot water supply pipe. The hot water supply pipe has a bellows shape in which a concave portion extending spirally is formed on the outer peripheral surface thereof,
The heat exchanger according to claim 1 or 2, wherein the refrigerant pipe is wound along the concave portion. Refrigerant piping through which the refrigerant circulating in the heat pump cycle flows;
Water for heat exchange with the refrigerant flowing through the refrigerant pipe flows, and a hot water supply pipe connected to the hot water supply terminal,
A heated fluid that exchanges heat with the refrigerant flowing through the refrigerant pipe flows, and includes a heating pipe connected to the heating device,
The hot water supply pipe has a flat frame shape,
The refrigerant pipe is wound around the outer surface of the hot water supply pipe,
The heating pipe is a heat exchanger that comes into contact with the refrigerant pipe from the outer side opposite to the hot water supply pipe arranged inside the refrigerant pipe. The refrigerant pipe includes a plurality of branch pipes through which the refrigerant flows.
The heat exchanger according to claim 4, wherein the plurality of branch pipes are wound around an outer surface of the hot water supply pipe in a state of being connected in parallel.

Images