JP2010223492A - Water heat exchanger and heat pump type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water heat exchanger suppressing deterioration of manufacturing performance and increase in manufacturing cost and having good space efficiency. <P>SOLUTION: The water heat exchanger 3 includes: a fin group 20 having a plurality of fins 21 long in one direction and laminated in the posture in which the longitudinal directions are aligned leaving clearances; a refrigerant heat transfer pipe 30 which is penetrated through all of the fins 21 in the laminated direction of the fins 21 and is formed to meander in the longitudinal direction of the fins 21 and inside of which a refrigerant is made to flow; and a water heat transfer pipe 40 which is penetrated through all of the fins 21 in the laminated direction of the fins 21, located adjacent to the refrigerant heat transfer pipe 30 and formed to meander in the longitudinal direction of the fins 21 and inside of which water is made to flow. Slits 27 are provided between adjacent sections of the refrigerant heat transfer pipe 30 in the respective fins 21. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a water heat exchanger that performs heat exchange between a refrigerant and water, and a heat pump hot water supply apparatus that includes the water heat exchanger.

  Conventionally, a water heat exchanger used in a heat pump type hot water supply apparatus is such that a refrigerant heat transfer tube through which a refrigerant flows and a water heat transfer tube through which water flows are brought into direct contact with each other by brazing, or the refrigerant is placed inside the water heat transfer tube. Heat transfer tubes were inserted to promote heat transfer and exchange heat.

  However, with such a structure, the manufacturing method and shape of the water heat exchanger are complicated, and therefore, in-process management at the time of manufacture becomes complicated. As a result, the manufacturability of the water heat exchanger deteriorates and the manufacturing cost increases.

  Moreover, due to the complicated shape, there is a problem that the arrangement structure of the water heat exchanger in the heat pump type hot water heater becomes complicated.

  On the other hand, a fin-tube heat exchanger has been proposed as a water heat exchanger. (For example, refer to Patent Document 1).

JP 2007-293756 A

  In the structure disclosed in Patent Document 1, one refrigerant heat transfer tube and one water heat transfer tube are provided on the fin. For this reason, in this structure, a sufficient amount of heat exchange cannot be obtained between the refrigerant and water.

  An object of the present invention is to provide a water heat exchanger that suppresses deterioration of manufacturability, suppresses an increase in manufacturing cost, and suppresses an arrangement structure from becoming complicated. Another object of the present invention is to provide a heat pump hot water supply apparatus that includes a water heat exchanger that suppresses deterioration of manufacturability, suppresses an increase in manufacturing cost, and has good space efficiency.

  The water heat exchanger according to claim 1 includes a fin group, a refrigerant heat transfer tube, and a water heat transfer tube. The fin group includes a plurality of fins that are long in one direction, and the plurality of fins are stacked with a gap therebetween in a posture in which the longitudinal directions are aligned with each other. The refrigerant heat transfer tube penetrates all the fins in the laminating direction of the fins and is formed in a meandering shape in the longitudinal direction of the fins, and the refrigerant flows inside. The water heat transfer tube penetrates all the fins in the stacking direction of the fins, is adjacent to the refrigerant heat transfer tube, and is formed in a meandering shape in the longitudinal direction of the fins, so that water flows therethrough. . A heat blocking means is provided between the refrigerant heat transfer tubes adjacent to each other in each fin.

  The heat pump type hot water supply apparatus according to claim 4 includes a refrigeration cycle, an inflow portion, and an outflow portion. The refrigeration cycle includes the water heat exchanger according to any one of claims 1 to 3, a compressor, an expansion valve, and an air heat exchanger. The inflow portion is connected to the water heat transfer tube of the water heat exchanger and feeds water to the water heat transfer tube. The outflow portion is connected to the water heat transfer tube of the water heat exchanger and guides the water flowing out from the water heat transfer tube to the outside.

  The present invention can suppress deterioration of manufacturability, suppress an increase in manufacturing cost, and provide a space-efficient water heat exchanger. Moreover, other invention can provide a heat pump type hot water supply apparatus provided with the water heat exchanger which suppresses that manufacturability deteriorates, suppresses the increase in manufacturing cost, and can suppress that a layout structure becomes complicated.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic which shows schematically the heat pump type hot water supply apparatus which concerns on the 1st Embodiment of this invention. The perspective view which shows the water heat exchanger shown by FIG. The top view which shows the water heat exchanger shown by FIG. Sectional drawing of the water heat exchanger shown along F4-F4 line shown by FIG. The graph which shows the temperature of the refrigerant | coolant between the inlet_port | entrance for refrigerant | coolants and the exit for refrigerant | coolants in the water heat exchanger shown by FIG. 2, and the temperature of the water between the inlet_port | entrance for water and the outlet for water. The side view which shows the water heat exchanger with which the heat pump type hot-water supply apparatus which concerns on the 2nd Embodiment of this invention is provided. The top view which shows the water heat exchanger shown by FIG. The side view which shows a part of water heat exchanger with which the heat pump type hot-water supply apparatus which concerns on the 3rd Embodiment of this invention is provided. The perspective view which shows the plate fin with which the heat pump type hot-water supply apparatus which concerns on the 4th Embodiment of this invention is provided. The side view which shows a part of water heat exchanger with which the heat pump type hot-water supply apparatus which concerns on the 5th Embodiment of this invention is provided. The side view which shows a part of water heat exchanger with which the heat pump type hot-water supply apparatus which concerns on the 6th Embodiment of this invention is provided. The side view which shows a part of water heat exchanger with which the heat pump type hot-water supply apparatus which concerns on the 7th Embodiment of this invention is provided.

  A heat pump hot water supply apparatus according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic view schematically showing a heat pump hot water supply apparatus 10. As shown in FIG. 1, the heat pump hot water supply apparatus 10 includes a compressor 1, a water heat exchanger 3, an internal heat exchanger 4, an expansion valve 5, an air heat exchanger 6, and a water supply pipe section 8. A pump 9 and a hot water storage tank 12 are provided.

  The compressor 1, the water heat exchanger 3, the internal heat exchanger 4, the expansion valve 5, and the air heat exchanger 6 constitute a refrigeration cycle 11. Specifically, the compressor 1 is sequentially connected to the water heat exchanger 3, the internal heat exchanger 4, the expansion valve 5, and the air heat exchanger 6 through the refrigerant pipe portion 2. The refrigeration cycle 11 uses carbon dioxide (CO2) as an example of a refrigerant.

  The water supply pipe unit 8 is provided in the water heat exchanger 3. The pump 9 is provided on one end side of the water supply pipe portion 8. The hot water storage tank 12 is provided on the other end side of the water supply pipe portion 8. Water W flows in the water supply pipe portion 8 by the pump 9. The water W is stored in the hot water storage tank 12 after undergoing heat exchange through the water heat exchanger 3 when passing through the water supply pipe section 8. The structure of the water heat exchanger 3 will be described in detail later.

  In the heat pump hot water supply apparatus 10, the high-temperature and high-pressure gaseous refrigerant L discharged from the compressor 1 flows into the water heat exchanger 3. The refrigerant L exchanges heat with water flowing in the water supply pipe section 8 in the process of flowing in the water heat exchanger 3.

  The refrigerant L that has exited the water heat exchanger 3 is in a liquid state because its temperature has decreased due to heat exchange with the water W. This refrigerant L then flows into the internal heat exchanger 4. In the process of flowing through the internal heat exchanger 4, the refrigerant L is heat-exchanged with the refrigerant L that has come out of the air heat exchanger 6 described later, and the temperature further decreases.

  The refrigerant L exiting the internal heat exchanger 4 reaches the expansion valve 5. The refrigerant L is decompressed by the expansion valve 5 and then flows into the air heat exchanger 6 to evaporate into a gaseous state. Next, the refrigerant exiting the air heat exchanger 6 flows into the internal heat exchanger 4. The refrigerant flowing into the internal heat exchanger 4 is heated. The refrigerant that has exited the internal heat exchanger 4 is sucked into the compressor 1.

  In the heat pump hot water supply apparatus 10, the temperature of the water W supplied to the water supply pipe section 8 is increased by the above operation. The water W whose temperature has increased in the water heat exchanger 3 is stored in the hot water storage tank 12.

  Next, the structure of the water heat exchanger 3 will be specifically described. FIG. 2 is a perspective view showing the water heat exchanger 3. As shown in FIG. 2, the water heat exchanger 3 includes a fin group 20, a refrigerant heat transfer tube 30, and a water heat transfer tube 40.

  The fin group 20 includes a plurality of plate fins 21. The plate fins 21 may all have the same structure. The plate fin 21 is a plate member that is long in one direction, and has a rectangular shape as an example. The plate fin 21 is formed of an aluminum material as an example. In addition, it is not limited to an aluminum material, For example, you may form with copper, Preferably the material with favorable heat conductivity is used.

  The longitudinal direction of the plate fin 21 is indicated by an arrow A. A direction orthogonal to the longitudinal direction A is defined as a width direction B. Each plate fin 21 is laminated | stacked, for example in parallel so that it may not contact mutually. Each plate fin 21 has the same posture in the stacking direction.

  The refrigerant heat transfer tube 30 constitutes a part of the refrigerant tube portion 2, and the refrigerant flows therein. The refrigerant heat transfer tube 30 is connected to the compressor 1 through, for example, a tube member 2a, and is connected to the internal heat exchanger 4 through, for example, a tube member 2b. These pipe members 2 a and 2 b are also part of the refrigerant pipe portion 2.

  The refrigerant heat transfer tube 30 is a portion that passes through the fin group 20 in the refrigerant tube portion 2 described above. One refrigerant heat transfer tube 30 is provided at one end 22 in the width direction B of each plate fin 21 and at the other end 23 in the width direction B of each plate fin 21. The refrigerant heat transfer tubes 30 formed at the one end 22 and the other end 23 have the same structure.

  FIG. 3 is a plan view of the water heat exchanger as viewed from the width direction. In the fin group 20 shown in FIG. 3, some of the plate fins 21 are illustrated, and the illustration of the plate fins 21 in the range C indicated by the two-dot chain line is omitted. However, actually, the plate fins 21 are also laminated in the range C.

  FIG. 3 shows a state where the refrigerant heat transfer tube 30 provided at the one end portion 22 passes through the fin group 20. In addition, in FIG. 3, the heat exchanger tube 40 for water mentioned later is abbreviate | omitted for description. As described above, the refrigerant heat transfer tubes 30 formed at the one end portion 22 and the other end portion 23 have the same structure. Therefore, the refrigerant heat transfer tube 30 formed at the one end portion 22 will be described as a representative. .

  As shown in FIG. 3, the refrigerant heat transfer tube 30 includes a plurality of refrigerant heat transfer tube main bodies 31 and a plurality of refrigerant bend tubes 32. The refrigerant heat transfer tube body 31 includes a pair of straight portions 33 and a connecting portion 34 that connects the straight portions 33. The straight part 33 is linear, and the connecting part 34 is U-shaped. Each linear part 33 is arrange | positioned so that it may mutually become parallel, and the connection part 34 has connected one opening of each linear part 33. FIG. The straight portion 33 and the connecting portion 34 are formed integrally, and are formed, for example, by bending a single pipe member. For this reason, as for the heat exchanger tube main body 31 for refrigerant | coolants, while each linear part 33 is mutually connected via the connection part 34, the planar shape is U-shaped.

  The refrigerant heat transfer tube main body 31 is provided in the fin group 20 such that each straight portion 33 passes through the fin group 20. Each plate fin 21 is formed with a refrigerant insertion hole 24 through which the straight portion 33 of the refrigerant heat transfer tube body 31 passes. The refrigerant insertion hole 24 has a shape into which the linear portion 33 of the refrigerant heat transfer tube main body 31 is fitted, and the entire area of the edge of the refrigerant insertion hole 24 is on the peripheral surface of the linear portion 33 of the refrigerant heat transfer tube main body 31. The refrigerant heat transfer tube main body 31 is in close contact by being expanded. For this reason, the heat of the refrigerant L passing through the refrigerant heat transfer tube 30 is efficiently transmitted to each plate fin 21.

  The posture of the straight portions 33 passing through the plate fins 21 is a posture in which each straight portion 33 is parallel to a direction orthogonal to the longitudinal direction A and the width direction B. As shown in FIG. 2, each refrigerant heat transfer tube main body 31 is arranged so that the other opening 35 of the straight portion 33 (the opening to which the connecting portion 34 is not connected) is aligned in the longitudinal direction A.

  Of the openings 35 arranged in the longitudinal direction A, the opening 35 disposed at one end in the longitudinal direction A serves as a refrigerant inlet 36, and the opening 35 disposed at the other end serves as a refrigerant outlet 37. . The refrigerant inlet 36 is connected to the pipe member 2a and the refrigerant L flows in. The refrigerant outlet 37 is connected to the pipe member 2b and the refrigerant L flows out.

  As shown in FIG. 3, the refrigerant bend pipe 32 has a substantially U-shaped planar shape. The refrigerant bend pipe 32 connects the openings 35 excluding the refrigerant inlet 36 and the refrigerant outlet 37 adjacent to each other in the longitudinal direction A. With this structure, the refrigerant inlet 36 and the refrigerant outlet 37 are communicated with each other by the plurality of refrigerant heat transfer tube bodies 31 and the plurality of refrigerant bend tubes 32. Therefore, the refrigerant heat transfer tube 30 is connected to the refrigerant inlet. From the 36 to the refrigerant outlet 37, the fin group 20 is arranged to meander. FIG. 2 shows a state where the refrigerant bend pipe 32 is removed.

  The refrigerant heat transfer tube 30 provided at the other end portion 23 has the same structure as the refrigerant heat transfer tube 30 provided at the one end portion 22. As shown in FIG. 2, the refrigerant heat transfer tube main body 31 of the refrigerant heat transfer tube 30 formed at one end portion 22 and the other end portion 23 is the same number from the end in the longitudinal direction A. It is arranged so as to face the direction B. The term “facing in the width direction B” as used herein means that each linear portion 33 faces in the width direction B.

  Specifically, among the refrigerant heat transfer tube main bodies 31 of the refrigerant heat transfer tubes 30 formed at the one end 22 and the other end 23 in the width direction B, the refrigerant use is the first from one end in the longitudinal direction A. In the heat transfer tube body 31, one straight portion 33 faces the width direction B, and the other straight portion 33 faces the width direction B.

  The water heat transfer tube 40 is provided in the fin group 20 so as to meander through the fin group 20 like the refrigerant heat transfer tube 30. The water heat transfer pipe 40 is a part of the water supply pipe section 8, and is connected to the pump 9 through, for example, a pipe member 8a, and is connected to the hot water storage tank 12 through, for example, the pipe member 8b. The pipe member 8a is an example of the inflow portion referred to in the present invention. The pipe member 8b is an example of the outflow part referred to in the present invention. As shown in FIG. 2, the water heat transfer tubes 40 are provided so as to pass between the refrigerant heat transfer tubes 30 provided at one end 22 and the other end 23 in the width direction B in each plate fin 21. .

  4 is a cross-sectional view of the water heat exchanger 3 taken along the line F4-F4 shown in FIG. FIG. 4 is a plan view of the water heat transfer tube 40 as viewed in the width direction B as it passes through the fin group 20. In FIG. 4, the refrigerant heat transfer tube 30 provided at the other end 23 is omitted from the illustration.

  As shown in FIG. 4, the water heat transfer tube 40 includes a plurality of water heat transfer tube main bodies 41 and a plurality of water bend tubes 42. The water heat transfer tube main body 41 has a pair of straight portions 43 and a connecting portion 44 that connects the straight portions 43. The straight part 43 is linear, and the connecting part 44 is U-shaped. Each linear part 43 is arrange | positioned so that it may mutually become parallel, and the connection part 44 has connected one opening of each linear part 43. FIG. The straight line portion 43 and the connecting portion 44 are formed integrally with each other, and are formed by bending a single pipe member, for example. For this reason, as for the heat exchanger tube main body 41 for water, while each linear part 43 is connected via the connection part 44, the planar shape is U shape.

  The water heat transfer tube main body 41 is provided in the fin group 20 so that each straight portion 43 passes through all the plate fins 21. For this reason, each plate fin 21 is formed with a water insertion hole 25 through which the straight portion 43 of the water heat transfer tube body 41 passes. The water insertion hole 25 has a shape in which the straight portion 43 of the water heat transfer tube main body 41 is fitted. Therefore, the entire area of the edge of the water insertion hole 25 is the circumference of the straight portion 43 of the water heat transfer tube main body 41. The water heat transfer tube main body 41 is in close contact with the surface by expanding the tube. For this reason, the heat of each plate fin 21 is efficiently transmitted to the heat transfer tube 40 for water.

  As an example, the posture of the straight portion 43 passing through the plate fin 21 is a posture in which the straight portion 43 is parallel to a direction orthogonal to the longitudinal direction A and the width direction B. Further, as shown in FIG. 2, in the water heat transfer tube 40, the other opening 45 (opening to which the connecting portion 44 is not connected) of the linear portion 43 of each water heat transfer tube main body 41 is arranged in the longitudinal direction A. Is arranged.

  The other opening 45 of the water heat transfer tube 40 opens to the same side as the opening 35 of the refrigerant heat transfer tube main body 31. Of the openings 45 arranged in the longitudinal direction A, the opening 45 disposed at the other end in the longitudinal direction A serves as a water inlet 46, and the opening 45 disposed at one end serves as a water outlet 47. ing. The pipe member 8a is connected to the water inlet 36, and the pipe member 8b is connected to the water outlet 47.

  The water bend pipe 42 is substantially U-shaped in plan view. The water bend pipe 42 connects the openings 45 excluding the water inlet 46 and the water outlet 47 adjacent to each other in the longitudinal direction A. With this structure, the water inlet 46 and the water outlet 47 are communicated with each other by the plurality of water heat transfer pipe bodies 41 and the plurality of water bend pipes 42. Therefore, the water heat transfer pipe 40 is connected to the water inlet. The fin group 20 is provided to meander from the water outlet 46 to the water outlet 47. In FIG. 2, a state where the water bend pipe 42 is removed is shown for explanation.

  In the present embodiment, the inner diameter of the refrigerant heat transfer tube main body 31 and the inner diameter of the refrigerant bend tube 32 are the same. The inner diameter of the water heat transfer tube main body 41 and the inner diameter of the water bend tube 42 are the same. As shown in FIG. 2, the inner diameter of the water heat transfer tube 40 is larger than the inner diameter of the refrigerant heat transfer tube 30. In other words, the inner diameter of the refrigerant heat transfer tube 30 is smaller than the inner diameter of the water heat transfer tube 40.

  Next, the positional relationship between the refrigerant heat transfer tube 30 and the water heat transfer tube 40 will be specifically described. As shown in FIG. 2, the straight portion 43 of the water heat transfer tube main body 41 is disposed between the straight portions 33 of the refrigerant heat transfer tube main bodies 31 adjacent to each other in the longitudinal direction A, and therefore the straight portion 33. , 43 are arranged in a staggered manner with respect to each other. For this reason, the length of the width direction B of each plate fin 21 can be shortened. Further, because of the arrangement structure, the water heat transfer tube 40 is disposed adjacent to the refrigerant heat transfer tube 30.

  As shown in FIG. 2, the refrigerant heat transfer tube 30 and the water heat transfer tube 40 have the above-described structure, so that the refrigerant inlet 36 and the water outlet 47 are arranged at one end in the longitudinal direction A. Are adjacent to each other. The refrigerant outlet 37 and the water inlet 46 are disposed at the other end in the longitudinal direction A and are adjacent to each other.

  In each plate fin 21, heat blocking means is provided between the linear portions 33 adjacent to each other. In the present embodiment, since the linear portion 33 is adjacent to the longitudinal direction A, a heat blocking means is provided between the linear portions 33 adjacent to each other in the longitudinal direction A. The heat blocking means has a function of suppressing heat exchange between the straight portions 33 via the plate fins 21. In the present embodiment, as shown in FIG. 2, a cut 26 is formed as an example between the straight portions 33 adjacent to each other in each plate fin 21.

  Each cut 26 extends in the width direction B. The cuts 26 penetrate the plate fins 21. The cuts 26 suppress heat exchange between the linear portions 33 adjacent to each other via the plate fins 21. Note that the cuts 26 do not reach the water insertion holes 25 of the plate fins 21 as shown in an enlarged view by a two-dot chain line in the figure.

  Next, the operation of the water heat exchanger 3 will be described. As shown in FIGS. 2 and 3, the refrigerant L that has flowed into the water heat exchanger 3 flows into the refrigerant heat transfer tube 30 from the refrigerant inlet 36, and moves toward the refrigerant outlet 37 in the refrigerant heat transfer tube 30. Flow. At this time, the heat of the refrigerant L is transmitted to the fin group 20 (each plate fin 21).

  The water W that has flowed into the water heat exchanger 3 flows into the water heat transfer tube 40 from the water inlet 46 and flows in the water heat transfer tube 40 toward the water outlet 47. At this time, since the refrigerant inlet 36 and the water outlet 47 are provided adjacent to each other, and the refrigerant outlet 37 and the water inlet 46 are provided adjacent to each other, the flow of the refrigerant L and the water W The flows are opposite to each other. When the water W flows in the water heat transfer tube 40, the heat of the refrigerant L transmitted to each plate fin 21 is transmitted to the water W.

  The refrigerant L that has exited the refrigerant outlet 37 is then guided to the internal heat exchanger 4. The water W exiting the water outlet 47 is guided to the hot water storage tank 12.

  FIG. 5 is a graph showing the temperature of the refrigerant L between the refrigerant inlet 36 and the refrigerant outlet 37 and the temperature of the water W between the water inlet 46 and the water outlet 47 in the water heat exchanger 3. G is shown. The graph G shows the temperature gradient between the refrigerant L and the water W. In the graph G, the horizontal axis indicates the position in the refrigerant heat transfer tube 30 and the water heat transfer tube 40, and the vertical axis indicates the temperature. In the refrigerant L, the temperature of the refrigerant inlet 36 is T1, and the temperature of the refrigerant outlet 37 is T2. In the water W, the temperature of the water inlet 46 is t1, and the temperature of the water outlet 47 is t2.

  By the above operation of the water heat exchanger 3, as shown in FIG. 5, the temperature of the refrigerant L decreases in the process of flowing from the refrigerant inlet 36 to the refrigerant outlet 37 (T1> T2). The temperature of the water W rises in the process of flowing from the water inlet 46 to the water outlet 47 (t2> t1).

  In the heat pump type hot water supply apparatus 10 including the water heat exchanger 3 configured as described above, the refrigerant heat transfer tube 30 is connected to the fin group 20 (each plate fin 21), and the water heat transfer tube 40 is connected to the fin group 20. By being connected to (each plate fin 21), heat transfer from the refrigerant L to the water W is performed via the fin group 20.

  For this reason, since it is not necessary to directly connect the refrigerant heat transfer tube 30 and the water heat transfer tube 40, the productivity in producing the water heat exchanger 3 is improved. Furthermore, since it is not necessary to directly connect the refrigerant heat transfer tube 30 and the water heat transfer tube 40, the shape of the water heat exchanger 3 can be simplified, so that the space for arranging the water heat exchanger 3 can be reduced. Efficiency is improved. In addition, space efficiency improves that the space which cannot be used by arrange | positioning the water heat exchanger 3 decreases.

  The refrigerant inlet 36 and the water outlet 47 are provided at one end in the longitudinal direction A of the fin group 20 so as to be adjacent to each other, and the refrigerant outlet 37 and the water inlet 46 are arranged in the longitudinal direction A of the fin group 20. By providing at the other end and adjoining each other, the refrigerant flow and the water flow are opposite to each other. For this reason, heat transfer from the refrigerant L to the water W can be efficiently promoted.

  Further, by providing a notch 26 which is an example of a heat blocking means between the water insertion holes 25 in each plate fin 21, heat exchange between the refrigerant heat transfer tubes 30 in each plate fin 21 is suppressed. Is done. For this reason, the heat exchange performance between the refrigerant | coolant L and the water W improves.

  Moreover, in each plate fin 21, the linear part 33 of the refrigerant | coolant heat exchanger tube 30 and the linear part 43 of the water heat exchanger tube 40 are arrange | positioned in zigzag form, The length of the width direction B of each plate fin 21 is made. Can be shortened. Furthermore, since the one linear part 43 comes to oppose the two linear parts 33 by arrange | positioning in zigzag form, the heat transfer efficiency from the refrigerant | coolant L to the water W improves.

  Further, the inner diameter of the water heat transfer tube 40 is larger than the inner diameter of the refrigerant heat transfer tube 30. For this reason, the heat exchange rate between the refrigerant | coolant L and the water W improves. This point will be specifically described.

  The refrigerant L flowing in the refrigerant heat transfer tube 30 has latent heat of condensation and therefore has a larger heat capacity than the water W. For this reason, in order to efficiently promote heat transfer from the refrigerant L to the water W, the flow rate of the water W needs to be set to a predetermined level or more. In addition, the flow rate said here is the flow rate per unit time.

    By making the inner diameter of the water heat transfer tube 40 at least larger than the inner diameter of the refrigerant heat transfer tube 30, the flow rate of the water W can be increased. For this reason, since the heat transfer from the refrigerant | coolant L to the water W can be accelerated | stimulated efficiently, the heat exchange rate from the refrigerant | coolant L to the water W can be improved.

  Furthermore, since the inner diameter of the water heat transfer tube 40 is larger than the inner diameter of the refrigerant heat transfer tube 30, it is possible to suppress an increase in energy consumption necessary to raise the water W to a predetermined temperature. This point will be specifically described.

  First, temperature efficiency will be described. When the temperature efficiency is ε, ε = (t2−t1) / (T1−t1). This formula is based on the water side. In order to improve the temperature efficiency ε, it is conceivable to increase the temperature t2 of the water W at the water outlet 47 by reducing the flow rate of the water. In this case, the amount of heat transfer to the water W decreases. As a result, the temperature of the refrigerant L at the refrigerant outlet 37 increases.

  As a result, the discharge pressure of the compressor 1 increases and the work amount of the compressor 1 increases. From this point of view, when the temperature efficiency ε is improved, the inner diameter of the water heat transfer tube 40 is preferably larger than the inner diameter of the refrigerant heat transfer tube 30. For this reason, when the temperature of the water W is raised to a predetermined temperature, the amount of energy consumed by the compressor 1 is reduced when the inner diameter of the water heat transfer tube 40 is larger than the inner diameter of the refrigerant heat transfer tube 30. be able to.

  Furthermore, by enlarging the inner diameter of the water heat transfer tube 40, even if calcium is deposited on the inner surface of the water heat transfer tube 40, the flow of the water W is prevented from being hindered.

  In each plate fin 21, a water heat transfer tube 40 is provided at the center in the width direction B, and a refrigerant heat transfer tube 30 is formed on both sides of the water heat transfer tube 40. For this reason, the amount of heat transfer from the refrigerant L to the water W increases.

  Next, a heat pump type hot water supply apparatus according to a second embodiment of the present invention will be described with reference to FIGS. In the present embodiment, configurations having functions similar to those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and description thereof is omitted. In this embodiment, the point from which the water heat exchanger 3 is further provided with the heat insulating material 50 differs from 1st Embodiment. Other structures may be the same as those in the first embodiment. The above different points will be specifically described.

  FIG. 6 is a side view showing the water heat exchanger 3 of the present embodiment. In FIG. 6, the bend pipes 32 and 42 are omitted in the refrigerant heat transfer pipe 30 and the water heat transfer pipe 40 for the sake of explanation. As shown in FIG. 6, the water heat exchanger 3 is provided with a heat insulating material 50 so as to cover the entire outer surface of the water heat exchanger 3. FIG. 7 is a plan view showing the water heat exchanger 3. In FIG. 7, the heat insulating material 50 is indicated by a two-dot chain line. As shown in FIG. 7, the heat insulating material 50 has a size that covers the refrigerant heat transfer tube 30 and the water heat transfer tube 40.

  In the drawing, a part of the heat insulating material 50 is sectioned so that the openings 35 and 45 can be seen in the water heat exchanger 3. The heat insulating material 50 is formed of a material having low thermal conductivity. In addition, the heat insulating material 50 is not limited to being comprised so that all the surfaces of the water heat exchanger 3 may be covered. For example, the water heat exchanger 3 may have a shape that opens so that the side surface on the side where the bend pipes 32 and 42 are provided and the side surface on the side where the connecting portions 34 and 44 are provided are visible from the outside.

  In the present embodiment, the heat insulating material 50 suppresses heat exchange between the fin group 20 and the surrounding air. For this reason, in this embodiment, in addition to the effect of 1st Embodiment, heat exchange with the refrigerant | coolant L and the water W via the fin group 20 comes to be performed efficiently.

  Next, a heat pump type hot water supply apparatus 10 according to a third embodiment of the present invention will be described with reference to FIG. In the present embodiment, configurations having functions similar to those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and description thereof is omitted. In the present embodiment, the heat blocking means is different from that of the first embodiment. Other structures may be the same as those in the first embodiment. The above different points will be specifically described.

  FIG. 8 is a side view showing a part of the water heat exchanger 3 of the present embodiment. In the figure, the bend tubes 32 and 42 of the refrigerant heat transfer tube 30 and the water heat transfer tube 40 are omitted for the sake of explanation. As shown in FIG. 8, in this embodiment, a slit 27 is formed instead of the notch 26 as the heat blocking means. The site where the slit 27 is provided may be the same location as the cut 26. The slit 27 passes through each plate fin 21. The slit 27 does not reach the refrigerant insertion hole 24.

  Even in this embodiment, the same effect as in the first embodiment can be obtained. In addition, the slit 27 of this embodiment can be used also for the heat pump type hot water supply apparatus 10 of the second embodiment. For this reason, when the slit 27 of this embodiment is used for the heat pump hot water supply apparatus 10 of the second embodiment, the same effects as those of the second embodiment can be obtained.

  Next, a heat pump type hot water supply apparatus 10 according to a fourth embodiment of the present invention will be described with reference to FIG. In addition, the structure which has the same function as 1st Embodiment attaches | subjects the code | symbol same as 1st Embodiment, and abbreviate | omits description. In the present embodiment, the heat blocking means is different from that in the first embodiment. Other structures may be the same as those in the first embodiment. The different structure will be specifically described.

  FIG. 9 is a perspective view showing the plate fin 21 of the present embodiment. As shown in FIG. 9, in the present embodiment, a cut-and-raised portion 28 is used in place of the cut 26 as the heat blocking means. The cut-and-raised part 28 is formed by cutting out a part of the plate fin 21 and raising the cut-out part. For this reason, the cut-and-raised part 28 has a through-hole 29 that penetrates the plate fin 21. The through hole 29 suppresses heat exchange between the refrigerant heat transfer tubes 30.

  The part where the cut and raised portion 28 is provided may be the same as the part where the cut 26 is formed. In the present embodiment, three cut-and-raised portions 28 are formed between the refrigerant insertion holes 24 as an example, but are not limited thereto. For example, it may be one, or other plural numbers such as four or five.

  Even in the present embodiment, the same effect as in the first embodiment can be obtained. The cut-and-raised part 28 of the present embodiment can be used for the heat pump hot water supply apparatus 10 of the first and second embodiments. For this reason, when the cut-and-raised part 28 of this embodiment is used for the heat pump type hot water supply apparatus 10 of the second embodiment, the same effects as those of the second embodiment can be obtained.

  Next, a heat pump hot water supply apparatus according to a fifth embodiment of the present invention will be described with reference to FIG. In addition, the structure which has the function similar to 1st Embodiment attaches | subjects the code | symbol similar to 1st Embodiment, and abbreviate | omits description. In the present embodiment, the arrangement structure of the refrigerant heat transfer tube 30 and the water heat transfer tube 40 is different from that of the first embodiment. Other structures may be the same as those in the first embodiment. The above different points will be specifically described.

  FIG. 10 is a side view showing a part of the water heat exchanger 3 of the present embodiment. As shown in FIG. 10, in this embodiment, two rows of refrigerant heat transfer tubes 30 are provided at one end 22 in the width direction B of each plate fin 21. The water heat transfer tubes 40 are provided in two rows at the other end 23 in the width direction B. The water heat transfer tube 40 and the refrigerant heat transfer tube 30 meander through the fin group 20 as in the first embodiment. In the figure, the bend pipes 32 and 42 are omitted for explanation.

  In the present embodiment, the straight line portion 33 of the refrigerant heat transfer tube 30 and the straight line portion 43 of the water heat transfer tube 40 that are adjacent to each other in the width direction B are arranged in a staggered manner in the same manner as in the first embodiment. The plate fins 21 are shortened in the width direction B.

  In the present embodiment, since the refrigerant heat transfer tubes 30 are adjacent to each other in the width direction B, the heat shut-off means are adjacent to each other between the straight portions 33 adjacent to each other in the longitudinal direction A in the plate fin 21 and to each other in the width direction B. It is provided between the straight portions 33 that fit. In the figure, the notch 26 is used as the heat blocking means, but the slit 27 and the cut-and-raised part 28 may be used.

  Even in the present embodiment, the same effect as in the first embodiment can be obtained. The arrangement structure of the refrigerant heat transfer tube 30 and the water heat transfer tube 40 of the present embodiment can be used in the first to fourth embodiments. When the arrangement structure of the refrigerant heat transfer tube 30 and the water heat transfer tube 40 of the present embodiment is used in the heat pump hot water supply apparatus 10 of the second to fourth embodiments, the same as the second to fourth embodiments. An effect is obtained.

  Next, a heat pump hot water supply apparatus according to a sixth embodiment of the present invention will be described with reference to FIG. In addition, the structure which has the same function as 1st Embodiment attaches | subjects the code | symbol same as 1st Embodiment, and abbreviate | omits description. In the present embodiment, the arrangement structure of the refrigerant heat transfer tube 30 and the water heat transfer tube 40 is different from that of the first embodiment. Other structures may be the same as those in the first embodiment. The above different points will be specifically described.

  FIG. 11 is a side view showing a part of the water heat exchanger 3 of the present embodiment. As shown in FIG. 11, in the present embodiment, the refrigerant heat transfer tube 30 provided at the one end 22 in the width direction B of the plate fin 21 is omitted. Even in the present embodiment, the same effect as in the first embodiment can be obtained. In the figure, the bend pipes 32 and 42 are omitted for explanation. The water heat transfer tube 40 and the refrigerant heat transfer tube 30 meander through the fin group 20 as in the first embodiment.

  The arrangement structure of the refrigerant heat transfer tube 30 and the water heat transfer tube 40 of the present embodiment can be used for the heat pump hot water supply apparatus 10 of the first to fourth embodiments. When used in the heat pump hot water supply apparatus 10 of the second to fourth embodiments, the same effects as those of the second to fourth embodiments are obtained.

  Next, a heat pump hot water supply apparatus according to a seventh embodiment of the present invention will be described with reference to FIG. In addition, the structure which has the same function as 1st Embodiment attaches | subjects the code | symbol same as 1st Embodiment, and abbreviate | omits description. In the present embodiment, the arrangement structure of the refrigerant heat transfer tube 30 and the water heat transfer tube 40 is different from that of the first embodiment. Other structures may be the same as those in the first embodiment. The above points will be specifically described.

  FIG. 12 is a side view showing a part of the water heat exchanger 3 of the present embodiment. As shown in FIG. 12, in the present embodiment, the water heat transfer tubes 40 are provided in one row at both ends 22 and 23 in the width direction B of the plate fins 21, and the refrigerant heat transfer tubes are interposed between the water heat transfer tubes 40. One row of heat tubes 30 is provided. In the figure, the bend pipes 32 and 42 are omitted for explanation. The water heat transfer tube 40 and the refrigerant heat transfer tube 30 meander through the fin group 20 as in the first embodiment.

  Even in the present embodiment, the same effect as in the first embodiment can be obtained. The arrangement structure of the refrigerant heat transfer tube 30 and the water heat transfer tube 40 of the present embodiment can also be used for the heat pump hot water supply apparatus 10 of the second to fourth embodiments. Even if the arrangement structure of the refrigerant heat transfer tube 30 and the water heat transfer tube 40 of the present embodiment is provided in the heat pump hot water supply device 10 of the second to fourth embodiments, Similar effects can be obtained.

In the first to seventh embodiments, the notch 26, the slit 27, and the cut-and-raised part 28 are used as the heat blocking means, but the present invention is not limited to this. The heat shut-off means only needs to have a function of shutting off heat exchange between the refrigerant heat transfer tubes via the fins.

  Moreover, in 1st-7th embodiment, although the heat | fever interruption | blocking means was provided in all the combinations of the heat exchanger tubes for refrigerant | coolants adjacent to each other in a fin, it is not limited to this. As in the first to seventh embodiments, it is preferable to provide heat blocking means for all the combinations of refrigerant heat transfer tubes adjacent to each other in the fins, but even in a structure in which the heat blocking means is provided in some combinations. Good. If at least one of the combinations of the refrigerant heat transfer tubes adjacent to each other in the fin is provided with a heat blocking means, the same effects as those of the first to seventh embodiments can be obtained.

  The present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiments. For example, you may delete some components from all the components shown by embodiment mentioned above. Furthermore, you may combine the component covering different embodiment suitably.

  DESCRIPTION OF SYMBOLS 1 ... Compressor, 3 ... Water heat exchanger, 5 ... Expansion valve, 6 ... Air heat exchanger, 10 ... Heat pump type hot water supply device, 20 ... Fin group, 21 ... Plate fin (fin), 26 ... Cut (heat insulation) Means), 27 ... slit (heat blocking means), 28 ... cut and raised portion (heat blocking means), 30 ... heat transfer pipe for refrigerant, 40 ... heat transfer pipe for water, 50 ... heat insulating material,

Claims (4)

A plurality of fins having a plurality of long fins in one direction, and a plurality of fins stacked with a gap therebetween in a posture in which the plurality of fins are aligned in the longitudinal direction;
Refrigerant heat transfer tubes that pass through all the fins in the stacking direction of the fins and are meandered in the longitudinal direction of the fins, and in which the refrigerant flows,
A heat transfer tube for water that penetrates all the fins in the stacking direction of the fins, is adjacent to the heat transfer tube for refrigerant, and is formed in a meandering shape in the longitudinal direction of the fins to allow water to flow inside. And
A heat heat exchanger is provided between the refrigerant heat transfer tubes adjacent to each other in each fin. The water heat exchanger according to claim 1, wherein the refrigerant heat transfer tube is thinner than the water heat transfer tube. The water heat exchanger according to claim 1 or 2,
A water heat exchanger comprising a heat insulating material provided around the fin group. A refrigeration cycle comprising the water heat exchanger according to any one of claims 1 to 3, a compressor, an expansion valve, and an air heat exchanger;
An inflow portion connected to the water heat transfer tube of the water heat exchanger and supplying water to the water heat transfer tube;
A heat pump type hot water supply apparatus comprising: an outflow portion connected to the water heat transfer tube of the water heat exchanger and guiding the water flowing out of the water heat transfer tube to the outside.

Images