JP6791102B2 - Heat pump hot water supply system with plate heat exchanger and plate heat exchanger - Google Patents

Description

The present invention relates to a heat pump type hot water supply system including a plate type heat exchanger and a plate type heat exchanger.

A laminated plate heat exchanger in which a plurality of heat transfer plates such as stainless steel plates are laminated and assembled integrally by brazing is known. The plate heat exchanger is equipped with a nozzle for connecting pipes as an inlet / outlet for fluid flowing inside. The mounting structure of the nozzle to the plate heat exchanger has been proposed in various documents. For example, Patent Document 1 illustrates a method of inserting and fixing a nozzle provided with a flange into a hole provided in a plate of the outermost layer. Further, Patent Document 2 discloses a method of joining a frame installed in the outermost layer of a plate heat exchanger and a flange formed at a nozzle end.

Japanese Unexamined Patent Publication No. 10-267580 Japanese Unexamined Patent Publication No. 62-20297

The flange surface provided on the nozzle functions as a joint surface when brazing to the heat transfer plate. However, the structure of the nozzle flange adopted in the above-mentioned conventional technique has the following problems.

The flange surface provided on the nozzle can be formed by, for example, press working. However, the flange surface formed by press working may crack during machining and may not be reliably joined. Further, the flange surface provided on the nozzle can also be formed by cutting or casting. However, such a processing method has a problem that the cost of the nozzle is high. As described above, the flange shape of the nozzle adopted in the above-mentioned conventional technique has room for improvement in that the nozzles are surely joined with a simple configuration.

The present invention has been made to solve the above-mentioned problems, and when joining a nozzle to the outermost layer of a heat transfer plate, a plate that enables reliable joining of the nozzle with a simple configuration. It is an object of the present invention to provide a type heat exchanger and a heat pump type hot water supply system equipped with this plate type heat exchanger.

The plate-type heat exchanger according to the present invention is composed of a laminated body in which a plurality of heat transfer plates having heat transfer surfaces formed by alternating ridges and dents are laminated, and a flat surface on the outermost layer of the laminated body. A plate flat portion, a plate opening provided on the plate flat portion for the heat medium flowing inside the laminate to enter and exit, and a nozzle joined to the plate opening so as to communicate with the plate opening. , Is equipped. The nozzle has a cylindrical nozzle cylindrical portion for connecting pipes, and a ring-shaped nozzle extending radially inward from the peripheral wall on one end side of the nozzle cylindrical portion in the axial direction and having a circular nozzle opening. A plate-shaped reinforcement provided with a nozzle flat surface portion composed of a flat surface, the nozzle flat surface portion and the plate flat surface portion are joined by brazing, and are joined so as to intervene between the plate flat surface portion and the nozzle flat surface portion. Further provided with a plate, the reinforcing plate is composed of a plate material thicker than the heat transfer plate, has a reinforcing plate opening which is a through hole at a position overlapping the plate opening, and is the outermost layer from the end of the plate opening. A plate-side burring portion extending outward is provided, and the nozzle is joined at a position where the outer peripheral side of the plate-side burring portion fits into the nozzle opening, and the diameter of the reinforcing plate opening is larger than the diameter of the nozzle opening. It is configured to be large .

According to the plate heat exchanger of the present invention, when joining a nozzle to the outermost layer of a heat transfer plate, it is possible to reliably join the nozzle with a simple configuration.

It is a perspective view of the plate type heat exchanger which concerns on Embodiment 1. It is a schematic view of the cross section of the plate heat exchanger in FIG. 1 cut by the AA plane parallel to the XY plane. FIG. 5 is a perspective view of a nozzle included in the plate heat exchanger according to the first embodiment. FIG. 2 is an enlarged view of a peripheral region b of the nozzle surrounded by a broken line. It is a schematic view of the cross section which cut the plate type heat exchanger of Embodiment 2 on the AA plane in FIG. FIG. 5 is an enlarged view of a peripheral region c of the nozzle surrounded by a broken line. It is a figure which shows the modification of the plate type heat exchanger which concerns on Embodiment 2. It is a perspective view which shows the periphery of the plate opening of the heat transfer plate of the outermost layer provided in the plate type heat exchanger which concerns on Embodiment 3. FIG. FIG. 5 is an enlarged view showing the periphery of the plate opening in the cross section of the plate heat exchanger according to the third embodiment cut along the AA plane in FIG. It is a figure which shows the modification of the plate type heat exchanger which concerns on Embodiment 3. An enlarged perspective view showing a modification of the plate-side burring portion included in the plate heat exchanger according to the third embodiment is shown. It is a perspective view of the nozzle provided in the plate type heat exchanger which concerns on Embodiment 4. FIG. It is an enlarged sectional view around the nozzle of the plate heat exchanger which concerns on Embodiment 4. FIG. It is a figure which shows the modification of the plate type heat exchanger which concerns on Embodiment 4. FIG. It is a circuit diagram of the heat pump type hot water supply system which used the plate type heat exchanger which concerns on Embodiment 5.

Hereinafter, embodiments will be described with reference to the drawings. The elements common to each figure are designated by the same reference numerals, and duplicate description will be omitted. The present disclosure may include any combination of configurable configurations among the configurations described in each of the following embodiments.

Embodiment 1.
The configuration of the plate heat exchanger according to the first embodiment will be described with reference to the drawings. FIG. 1 is a perspective view of a plate heat exchanger according to the first embodiment. Further, FIG. 2 is a schematic cross-sectional view of the plate heat exchanger in FIG. 1 cut along the AA plane parallel to the XY plane. The AA plane is a plane parallel to the XY plane through the central axes of the high temperature side inlet 41 and the low temperature side inlet 43, which will be described later. In the following description, the longitudinal direction of the plate heat exchanger 101 is defined as the X direction, the lateral direction is defined as the Z direction, and the thickness direction is defined as the Y direction.

As shown in FIGS. 1 and 2, the plate heat exchanger 101 of the first embodiment is configured by laminating a plurality of heat transfer plates 120. In the following description, the aggregate of the laminated heat transfer plates 120 is also referred to as a laminated body. Further, the heat transfer plate 120 located in the outermost layer on the + Y side of the laminated body is also referred to as the outermost layer heat transfer plate 121. The heat transfer plate 120 has a heat transfer surface 110 in a central region a surrounded by a broken line in FIG. The heat transfer surface 110 increases the heat transfer area by alternately forming a plurality of ridges and dents on the plate surface. The contacts between the heat transfer plates 120 are brazed with copper brazing to maintain watertightness, airtightness, and water pressure resistance. Since the configuration of the heat transfer surface 110 of the plate heat exchanger 101 is already known in various documents, detailed description thereof will be omitted here.

As shown in FIG. 1, a high temperature side inlet 41, which is an inlet of the heat exchange medium, is provided at the + X side end in the longitudinal direction and the + Z side in the lateral direction of the plate heat exchanger 101. Further, a low temperature side outlet 44, which is an outlet of the heat exchange medium, is provided at the + X side end portion in the longitudinal direction and the −Z side in the lateral direction of the plate heat exchanger 101. Further, a high temperature side outlet 42, which is an outlet of the heat exchange medium, is provided at the −X side end in the longitudinal direction and the −Z side in the lateral direction of the plate heat exchanger 101. Further, a low temperature side inlet 43, which is an inlet of the heat exchange medium, is provided at the −X side end portion in the longitudinal direction and the + Z side in the lateral direction of the plate heat exchanger 101. According to such a configuration, the high temperature side inlet 41 and the high temperature side outlet 42, and the low temperature side inlet 43 and the low temperature side outlet 44 are provided at diagonal positions on the surface of the heat transfer plate 120, respectively.

The high temperature side inlet 41, the high temperature side outlet 42, the low temperature side inlet 43, and the low temperature side outlet 44 are configured to include a nozzle 150 provided in the plate opening 130 of the heat transfer plate 120, respectively. Specifically, a plate plane portion 140 parallel to the XZ plane is provided in a region including the four corners of the plate heat exchanger 101. The plate flat portion 140 of the heat transfer plate 120 is provided with a plate opening 130 which is an outflow port of the heat exchange medium and the heat exchange medium, respectively. A nozzle 150 for a fluid outflow port is brazed to the plate flat portion 140 of the outermost layer heat transfer plate 121 installed in the outermost layer on the + Y side so as to communicate with the plate opening 130. The plate heat exchanger 101 of the first embodiment is characterized by a structure in which the nozzle 150 is fixed to the outermost layer heat transfer plate 121. Hereinafter, the fixed structure of the nozzle 150 will be described in detail with reference to the drawings.

FIG. 3 is a perspective view of a nozzle included in the plate heat exchanger according to the first embodiment. Further, FIG. 4 is an enlarged view of a peripheral region b of the nozzle surrounded by a broken line in FIG. As shown in FIGS. 3 and 4, the nozzle 150 has a cylindrical nozzle cylindrical portion 151 having a cylindrical shape substantially perpendicular to the plate flat portion 140 of the outermost layer heat transfer plate 121. A nozzle flange portion 152 for connecting a pipe or the like is provided at the + Y side end of the nozzle cylindrical portion 151. Further, at the end on the −Y side, which is a surface relative to the outermost layer heat transfer plate 121, a nozzle flat surface portion 153 formed of a plane parallel to the plate flat surface portion 140 of the outermost layer heat transfer plate 121 is provided. doing. The nozzle flat surface portion 153 is formed in an annular shape having a nozzle opening 154 that is concentric with the nozzle cylindrical portion 151 by extending inward in the radial direction from the peripheral wall on one end side in the axial direction of the nozzle cylindrical portion 151. There is.

As shown in FIG. 4, the nozzle 150 is brazed to the + Y side of the plate flat surface portion 140 at a position where the nozzle opening 154 overlaps the plate opening 130 of the outermost layer heat transfer plate 121 on the + Y side. Will be done. At this time, the nozzle flat surface portion 153 of the nozzle 150 serves as a brazing surface to the plate flat surface portion 140. Since both the nozzle flat surface portion 153 and the plate flat surface portion 140 are formed of flat surfaces, it is easy to reduce the clearance between them to less than 0.1 mm. Further, according to the brazing configuration of the nozzle 150, it is not necessary to press-fit the nozzle 150 into the outermost layer heat transfer plate 121. Therefore, it is possible to prevent the plate flat surface portion 140 in contact with the nozzle 150 from being deformed. This makes it possible to prevent the nozzle 150 from tilting with respect to the flat plate portion 140 after brazing.

Further, since the nozzle 150 of the first embodiment can be manufactured by pressing a sheet metal having a simple processing step, the cost of the nozzle 150 can be suppressed. Further, since the nozzle flat surface portion 153 has an annular shape extending inward in the radial direction of the nozzle cylindrical portion 151, there is no possibility that cracks will occur during processing even if the dimension L of the nozzle flat surface portion 153 is arbitrarily enlarged. .. Therefore, the contact area of the outermost layer of the nozzle flat surface portion 153 with the plate flat surface portion 140 can be increased, and the brazing property between the nozzle 150 and the heat transfer plate 120 can be stabilized.

Embodiment 2.
The plate heat exchanger 101 of the second embodiment will be described. In the plate heat exchanger 101 according to the first embodiment, the nozzle 150 is brazed to the + Y side of the plate flat portion 140 of the outermost layer of the outermost layer heat transfer plate 121. On the other hand, in the plate heat exchanger 101 according to the second embodiment, a plate-shaped reinforcing plate 160 for reinforcement is installed on the + Y side of the outermost layer of the outermost layer heat transfer plate 121. Hereinafter, the plate heat exchanger according to the second embodiment will be described with reference to FIGS. 5 to 7. In the second embodiment, the description of the same configuration as that of the first embodiment will be omitted or simplified, and the configuration different from that of the first embodiment will be described in detail.

FIG. 5 is a schematic cross-sectional view of the plate heat exchanger of the second embodiment cut on the AA plane in FIG. Further, FIG. 6 is an enlarged view of a peripheral region c of the nozzle surrounded by a broken line in FIG. As shown in FIGS. 5 and 6, in the plate heat exchanger 101 of the second embodiment, a reinforcing plate 160 for reinforcement is installed so as to cover the entire area on the + Y side of the outermost layer heat transfer plate 121. .. The reinforcing plate 160 is made of a plate material having a thickness thicker than that of the heat transfer plate 120. The reinforcing plate 160 is joined by brazing the contact points between the plate flat surface portion 140 of the outermost layer and the convex portion of the heat transfer surface 110. According to such a reinforcing plate 160, the pressure resistance of the plate heat exchanger 101 is improved.

The reinforcing plate 160 is provided with a reinforcing plate flat surface portion 162 at a position overlapping the plate flat surface portion 140. Further, the reinforcing plate 160 is provided with a reinforcing plate opening 161 which is a through hole at a position overlapping the plate opening 130. The reinforcing plate opening 161 has a diameter larger than that of the nozzle opening 154 of the nozzle 150 and a diameter smaller than that of the nozzle cylindrical portion 151. As shown in FIG. 6, the nozzle 150 is brazed to the + Y side of the reinforcing plate flat surface portion 162 at a position where the nozzle opening 154 overlaps the reinforcing plate opening 161 of the reinforcing plate 160. Both the nozzle flat surface portion 153 and the reinforcing plate flat surface portion 162, which are brazed surfaces, are formed of flat surfaces. Therefore, it becomes easy to make the clearance between these surfaces less than 0.1 mm. Further, according to the brazing configuration of the nozzle 150, it is not necessary to press-fit the nozzle 150 into the reinforcing plate 160. Therefore, it is possible to prevent the reinforcing plate 160 and the heat transfer plate 120 from being deformed. This makes it possible to prevent the nozzle 150 from tilting with respect to the reinforcing plate 160 after brazing.

The reinforcing plate 160 does not have to cover the entire area of the outermost layer heat transfer plate 121 as long as it covers a range larger than the joint surface with the nozzle flat surface portion 153. FIG. 7 is a diagram showing a modified example of the plate heat exchanger according to the second embodiment. Note that FIG. 7 shows a cross section of a plate heat exchanger as a modified example cut along the AA plane in FIG. In the modified example shown in this figure, the reinforcing plate 160 is divided into a plurality of parts in the X direction. In this way, even if the entire area of the heat transfer surface 110 of the outermost layer heat transfer plate 121 is not covered by the reinforcing plate 160, as long as the area larger than the joint surface with the nozzle flat surface portion 153 is covered, the reinforcing plate is used. The nozzle 150 can be joined to the 160.

Embodiment 3.
The plate heat exchanger 101 of the third embodiment will be described with reference to FIGS. 8 to 11. In the third embodiment, the description of the same configuration as that of the first embodiment or the second embodiment will be omitted or simplified, and the characteristic configuration of the third embodiment will be described in detail.

FIG. 8 is a perspective view showing the periphery of the plate opening of the outermost heat transfer plate included in the plate heat exchanger according to the third embodiment. As shown in this figure, the outermost layer heat transfer plate 121 includes a plate-side burring portion 122 that protrudes in the + Y direction from the peripheral edge of the plate opening 130. Such a plate-side burring portion 122 can be formed by, for example, press working. FIG. 9 is an enlarged view of the periphery of the plate opening in the cross section of the plate heat exchanger according to the third embodiment cut along the AA plane in FIG. As shown in FIG. 9, the nozzle 150 is installed so that the nozzle opening 154 fits radially outward with respect to the cylindrical surface of the plate-side burring portion 122. Then, the contact surfaces of the nozzle flat surface portion 153 of the nozzle 150 and the plate flat surface portion 140 of the heat transfer plate 120 are joined by brazing. With such a configuration, the nozzle 150 can be easily positioned on the heat transfer plate 120.

The outer diameter of the plate-side burring portion 122 is preferably 0.1 mm or more with respect to the inner diameter of the nozzle opening 154 of the nozzle 150. This eliminates the need for pressurization such as press fitting when joining the nozzle 150 to the heat transfer plate 120.

Further, in the plate heat exchanger according to the third embodiment, the reinforcing plate 160 may be interposed between the heat transfer plate 120 and the nozzle 150. FIG. 10 is a diagram showing a modified example of the plate heat exchanger according to the third embodiment. In the example shown in this figure, the reinforcing plate 160 is installed so that the reinforcing plate opening 161 fits radially outward with respect to the cylindrical surface of the plate-side burring portion 122. The nozzle 150 is installed so that the nozzle opening 154 fits radially outward with respect to the cylindrical surface of the plate-side burring portion 122 on the + Y side of the reinforcing plate 160. The height of the plate-side burring portion 122 is set to a height that protrudes in the + Y direction from the joined reinforcing plate 160. As a result, the reinforcing plate 160 and the nozzle 150 can be easily positioned with respect to the heat transfer plate 120, and the nozzle flat surface portion 153 and the plate flat surface portion 140 can be brazed more reliably.

Further, the root portion 123 on the outer peripheral side of the plate-side burring portion 122 has rounded corners due to bending. Therefore, when the reinforcing plate opening 161 comes into contact with the root portion 123 of the plate-side burring portion 122, the plate flat portion 140 of the outermost layer heat transfer plate 121 and the reinforcing plate flat portion 162 of the reinforcing plate 160 do not come into close contact with each other, resulting in brazing. There is a concern that the brazing property will deteriorate. Therefore, it is preferable that the diameter of the reinforcing plate opening 161 is further larger than the diameter of the nozzle opening 154 of the nozzle 150. This makes it possible to prevent the reinforcing plate opening 161 from coming into contact with the root portion 123 of the plate-side burring portion 122.

Further, the plate-side burring portion 122 is not limited to the form provided on the entire circumference of the peripheral edge of the plate opening 130. FIG. 11 shows an enlarged perspective view showing a modified example of the plate-side burring portion included in the plate heat exchanger according to the third embodiment. The plate-side burring portion 122 is intended for positioning the heat transfer plate 120 and the nozzle 150. Therefore, as shown in FIG. 11, the plate-side burring portion 122 may be formed by cutting and raising a part of the plate opening 130.

Embodiment 4.
The plate heat exchanger of the fourth embodiment will be described with reference to FIGS. 12 to 14. In the fourth embodiment, the same configurations as those in the first to third embodiments described above will be omitted or simplified, and the characteristic configurations of the fourth embodiment will be described in detail.

The plate heat exchanger 101 according to the fourth embodiment is characterized by the shape of the nozzle 170. FIG. 12 is a perspective view of a nozzle included in the plate heat exchanger according to the fourth embodiment. Further, FIG. 13 is an enlarged cross-sectional view of the periphery of the nozzle of the plate heat exchanger according to the fourth embodiment.

As shown in FIG. 12, the nozzle 170 includes a nozzle-side burring portion 172 that protrudes in the −Y direction from the peripheral edge of the nozzle opening 154. Such a nozzle-side burring portion 172 can be formed by, for example, press working. As shown in FIG. 13, the nozzle 170 is installed so that the cylindrical surface of the nozzle-side burring portion 172 fits inside the plate opening 130 in the radial direction. Then, the contact surfaces of the nozzle flat surface portion 153 of the nozzle 170 and the plate flat surface portion 140 of the heat transfer plate 120 are joined by brazing. With such a configuration, the nozzle 170 can be easily positioned on the heat transfer plate 120.

The outer diameter of the nozzle-side burring portion 172 preferably has a clearance of 0.1 mm or more with respect to the inner diameter of the plate opening 130. This eliminates the need for pressurization such as press fitting when joining the nozzle 170 to the heat transfer plate 120.

Further, in the plate heat exchanger according to the fourth embodiment, the reinforcing plate 160 may be interposed between the heat transfer plate 120 and the nozzle 170. FIG. 14 is a diagram showing a modified example of the plate heat exchanger according to the fourth embodiment. In the example shown in this figure, the reinforcing plate 160 is installed so that the reinforcing plate opening 161 fits radially outward with respect to the cylindrical surface of the nozzle-side burring portion 172. Then, the contact surfaces of the nozzle flat surface portion 153 of the nozzle 170 and the reinforcing plate flat surface portion 162 of the reinforcing plate 160 are joined by brazing. With such a configuration, the nozzle 150 can be easily positioned with respect to the heat transfer plate 120 and the reinforcing plate 160, and the nozzle flat surface portion 153 and the reinforcing plate flat surface portion 162 can be brazed more reliably.

Further, the root portion 174 on the outer peripheral side of the nozzle-side burring portion 172 has rounded corners due to bending. Therefore, the reinforcing plate opening 161 is the nozzle-side burring portion 172.
When it comes into contact with the root portion 174 of the nozzle, the reinforcing plate flat surface portion 162 of the reinforcing plate 160 and the nozzle flat surface portion 153 of the nozzle 170 do not come into close contact with each other, and there is a concern that the brazing property may deteriorate. Therefore, it is preferable that the diameter of the reinforcing plate opening 161 is further larger than the diameter of the plate opening 130. As a result, it is possible to prevent the reinforcing plate opening 161 from coming into contact with the root portion 174 of the nozzle-side burring portion 172.

Further, the nozzle-side burring portion 172 is not limited to the form provided on the entire circumference of the peripheral edge of the nozzle opening 154. That is, the nozzle-side burring portion 172 is intended for positioning the heat transfer plate 120 and the nozzle 150. Therefore, the nozzle-side burring portion 172 may be formed by cutting and raising a part of the nozzle opening 154, for example, as in the shape of the plate-side burring portion 122 shown in FIG. 11 described above.

Embodiment 5.
The plate heat exchanger of the fifth embodiment will be described with reference to FIG. The plate heat exchanger 101 according to the fifth embodiment is applied to a heat pump type hot water supply system. FIG. 15 is a circuit diagram of a heat pump type hot water supply system using the plate type heat exchanger according to the fifth embodiment. The plate heat exchanger 101 of the fifth embodiment may adopt any of the configurations of the plate heat exchangers 101 of the first to fourth embodiments described above.

As shown in FIG. 15, the heat pump type hot water supply system 500 includes a heat pump unit 1 and a tank unit 2. The heat pump unit 1 includes a compressor 11, a radiator 12, an expansion valve 13, an evaporator 14, a pipe 15, and a pipe 16. One side of the radiator 12 and one side of the evaporator 14 are connected by a pipe 15 via a compressor 11. Further, the other side of the radiator 12 and the other side of the evaporator 14 are connected by a pipe 16 via an expansion valve 13. As a result, the heat pump unit 1 is a loop-shaped circuit in which the radiator 12, the compressor 11, the evaporator 14, the expansion valve 13, and the radiator 12 are connected in order by the pipes 15 and 16.

The tank unit 2 contains the following various parts and pipes. The hot water storage tank 21 stores hot water. Inside the hot water storage tank 21, a temperature stratification can be formed in which the upper side is high temperature and the lower side is low temperature due to the difference in water density depending on the temperature. A water supply pipe (not shown) for supplying low-temperature water, which is water supplied from the water source, is connected to the lower part of the hot water storage tank 21.

A first circulation pump 25, a second circulation pump 28, a third circulation pump 31, and a plate heat exchanger 101 are built in the tank unit 2. The lower part of the hot water storage tank 21 is connected to the inlet of the radiator 12 of the heat pump unit 1 via the pipe 23. Further, the outlet of the radiator 12 of the heat pump unit 1 is connected to the upper part of the hot water storage tank 21 via the pipe 24. A first circulation pump 25 is provided in the middle of the pipe 23. By starting the operation of the first circulation pump 25 and the heat pump unit 1, the hot water heated by the heat pump unit 1 is accumulated in the hot water storage tank 21.

The plate heat exchanger 101 is connected to two flow paths. In the primary side flow path, which is one of the flow paths, high temperature water, which is a heat exchange medium stored in the upper part of the hot water storage tank 21, is supplied to the plate heat exchanger 101 from the high temperature side inlet 41 through the pipe 26. To. The high-temperature water that has passed through the plate-type heat exchanger 101 and has been heat-exchanged is discharged from the high-temperature side outlet 42, passes through the pipe 27, and is returned to the lower part of the hot water storage tank 21. Then, the circulation of high temperature water between the plate heat exchanger 101 and the hot water storage tank 21 in the primary side flow path is performed by the second circulation pump 28 provided in the middle of the pipe 27. That is, the primary side flow path through which the heat exchange medium flows communicates with the first flow path space of the plate heat exchanger 101.

Further, in the secondary side flow path which is the other flow path, for example, the low temperature water which is the heat exchange medium of the bathtub 3 is supplied to the plate type heat exchanger 101 from the low temperature side inlet 43 through the pipe 30. .. The low-temperature water that has passed through the plate-type heat exchanger 101 and has been heat-exchanged is discharged from the low-temperature side outlet 44, passes through the pipe 29, and is returned to the bathtub 3. Then, the circulation of the low temperature water between the plate heat exchanger 101 and the bathtub 3 in the secondary side flow path is performed by the third circulation pump 31 provided in the middle of the pipe 30. That is, the secondary flow path through which the heat exchange medium flows communicates with the second flow path space of the plate heat exchanger 101.

As described above, according to the heat pump type hot water supply system 500 shown in FIG. 1, it is possible to reheat the bathtub water of the bathtub 3 by using the plate type heat exchanger 101 shown in the first to fourth embodiments. Become.

By the way, in the fifth embodiment, an example in which the plate heat exchanger 101 is used for the heat pump type hot water supply system has been described, but the system to which the plate heat exchanger 101 can be applied is not limited to this. That is, the plate heat exchanger 101 can be applied to other systems such as a cooling chiller and a heat pump type heating / cooling system. It can also be used for industrial and household equipment such as power generation equipment and food heat sterilization equipment.

1 Heat pump unit, 2 Tank unit, 3 Bathtub, 11 Compressor, 12 Heat radiator, 13 Expansion valve, 14 Evaporator, 15, 16, 23, 24, 26, 27, 29, 30 Piping, 21 Hot water storage tank, 25th 1 circulation pump, 28 2nd circulation pump, 31 3rd circulation pump, 41 high temperature side inlet, 42 high temperature side outlet, 43 low temperature side inlet, 44 low temperature side outlet, 101 plate heat exchanger, 110 heat transfer surface , 120 heat transfer plate, 121 outermost layer heat transfer plate, 122 plate side burring part, 123 root part, 130 plate opening, 140 plate flat part, 150 nozzle, 151 nozzle cylindrical part, 152 nozzle flange part, 153 nozzle flat part , 154 Nozzle opening, 160 Reinforcing plate, 161 Reinforcing plate opening, 162 Reinforcing plate flat part, 170 Nozzle, 172 Nozzle side burring part, 174 Root part, 500 Heat pump type hot water supply system

Claims (4)

A laminated body in which a plurality of heat transfer plates having heat transfer surfaces formed with alternating ridges and dents are laminated, and
A flat plate portion formed of a flat surface on the outermost layer of the laminated body,
A plate opening provided on the flat surface of the plate and for allowing a heat medium flowing through the inside of the laminate to enter and exit,
In a plate heat exchanger comprising a nozzle joined to the plate opening so as to communicate with the plate opening.
The nozzle
Cylindrical nozzle for connecting pipes Cylindrical part,
A nozzle flat surface portion formed of a ring-shaped flat surface extending radially inward of the nozzle cylindrical portion from the peripheral wall on one end side in the axial direction of the nozzle cylindrical portion and having a circular nozzle opening.
The flat surface of the nozzle and the flat surface of the plate are joined by brazing .
Further, a plate-shaped reinforcing plate joined so as to be interposed between the plate flat surface portion and the nozzle flat surface portion is provided.
The reinforcing plate is
It is made of a plate material thicker than the heat transfer plate, and has a reinforcing plate opening that is a through hole at a position overlapping the plate opening.
A plate-side burring portion extending from the end of the plate opening toward the outside of the outermost layer is provided.
The nozzle is joined at a position where the outer peripheral side of the plate-side burring portion fits into the nozzle opening.
A plate heat exchanger characterized in that the diameter of the reinforcing plate opening is configured to be larger than the diameter of the nozzle opening . The plate heat exchanger according to claim 1 , wherein the reinforcing plate is provided so as to cover the entire area of the outermost layer of the heat transfer plate. The plate heat exchanger according to claim 1 or 2 , wherein the reinforcing plate is configured to cover a range larger than a joint surface with the nozzle flat surface portion. A heat pump type hot water supply system including the plate heat exchanger according to any one of claims 1 to 3 .

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