JP2017053615A - Fluid heating device and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid heating device that can efficiently heat fluid even when output power from a heater is increased, and to provide a method for manufacturing the same.SOLUTION: The fluid heating device 100 for heating hot water with the heater 21 includes: a heating part 22 formed so as to cover a periphery of the heater 21; and a support body 71 casted integrally with the heating part 22 while the heating part 22 is formed in a state where the heater 21 is supported to a mold 60 for molding the heating part 22.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a fluid heating apparatus that heats a fluid with a heater and a manufacturing method thereof.

  Patent Document 1 discloses a fluid heating apparatus that heats a fluid supplied from a supply passage into a tank by a heater and discharges the heated fluid from a discharge passage.

  A spiral heater is provided in the tank. The fluid flowing through the tank is heated by directly contacting the surface of the heater.

JP 2014-053288 A

  However, in the fluid heating device of Patent Document 1, the heater heats the fluid that directly contacts the surface. Therefore, if the output of the heater is increased, the fluid may be locally heated.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a fluid heating apparatus that can efficiently heat a fluid even when the output of the heater is increased, and a manufacturing method thereof.

  According to an aspect of the present invention, the heater is a fluid heating device that heats a fluid, and the heater is molded so as to cover the heater, and the heater is supported by a mold that molds the heating unit. There is provided a fluid heating apparatus comprising: a support body that is molded with the heating section and is integrally cast in the heating section.

  According to another aspect of the present invention, there is provided a manufacturing method of a fluid heating apparatus in which a heater heats a fluid, the installation step of installing a heater through a support in a mold, and a molten metal in the mold And a molding step of casting a support body and integrally molding a heating portion that covers the periphery of the heater and provides a fluid heating device manufacturing method.

  According to the above aspect, the structure in which the heater and the support are integrally cast in the heating unit prevents the fluid from directly contacting the surface of the heater. Thereby, compared with the case where the fluid is brought into direct contact with the heater, a heat transfer area for exchanging heat with the fluid is sufficiently secured, and the fluid is suppressed from being locally heated. Therefore, the fluid can be efficiently heated even when the output of the heater is increased.

FIG. 1 is an exploded perspective view of a fluid heating apparatus according to an embodiment of the present invention. FIG. 2 is a side view of the heater unit and the tank of the fluid heating device, and is a view showing the tank in cross section. FIG. 3 is a front view of the heater unit and the tank of the fluid heating device, and is a view showing the tank in cross section. FIG. 4 is a cross-sectional view showing a process for manufacturing the heater unit.

  Hereinafter, a fluid heating apparatus 100 according to an embodiment of the present invention will be described with reference to the drawings.

  The fluid heating device 100 is applied to a vehicle air conditioner (not shown) mounted on a vehicle such as an EV (Electric Vehicle: electric vehicle) or an HEV (Hybrid Electric Vehicle: hybrid vehicle). The fluid heating device 100 heats hot water as a fluid in order for the vehicle air conditioner to perform a heating operation.

  First, the overall configuration of the fluid heating apparatus 100 will be described with reference to FIGS. 1 to 3.

  As shown in FIG. 1, the fluid heating device 100 includes a tank 10 through which water flows, a heater unit 20 accommodated in the tank 10, a bus bar module 30 for connecting various electrical components, and a heater unit 20. The control board 40 as a control part for controlling operation | movement and the cover 50 which covers the bus-bar module 30 and the control board 40 are provided.

  The tank 10 is formed in a substantially rectangular parallelepiped shape. The tank 10 has a rectangular bottom surface 13, four wall surfaces 14 erected from the bottom surface 13, and an opening 15 that opens at the end of the wall surface 14 so as to face the bottom surface 13. The tank 10 has a supply port 11 through which hot water is supplied and a discharge port 12 through which hot water is discharged. The supply port 11 and the discharge port 12 open side by side on the same wall surface 14 of the tank 10. The fluid heating device 100 is disposed in the vehicle such that the discharge port 12 is positioned above the supply port 11 when in use.

  As shown in FIGS. 2 and 3, the heater unit 20 includes a heater 21 that generates heat, and a heating unit 22 that is formed so as to cover the periphery of the heater 21. In the heater unit 20, a metal is die-cast around the heater 21 to form the heating unit 22. The heating unit 22 is formed integrally with a top plate unit 23 that closes the opening 15 of the tank 10.

  The heater 21 has a spiral heat generating part 21 c cast into the heating part 22 and a pair of terminals 21 a and 21 b protruding from the heating part 22. Note that the heater 21 may have a heat generating portion that is not spiral, but is formed so as to reciprocate within the heating portion 22, for example.

  The heater 21 is supplied with electric power through a bus bar module 30 from a power supply device (not shown) mounted on the vehicle to the pair of terminals 21a and 21b. The heater 21 is a sheathed heater or a PTC (Positive Temperature Coefficient) heater that generates heat from the heat generating portion 21c when energized. The heater 21 is preferably a sheathed heater in terms of cost. The heater 21 generates heat in response to a command from the control board 40 and heats the hot water flowing through the tank 10.

  The heating part 22 is formed in a small diameter compared with the inner periphery of the heat generating part 21c and has a through hole 25 penetrating along the central axis of the heat generating part 21c, and a large diameter compared with the outer periphery of the heat generating part 21c. 10 outer walls 26 facing the inner walls 17. The heating unit 22 is formed of a metal having a lower melting point than that of the heater 21. Here, the heater 21 is formed of stainless steel, and the heating unit 22 is formed of an aluminum alloy.

  The through hole 25 is formed inside the heat generating portion 21c wound in a spiral shape. The supply port 11 of the tank 10 opens on an extension line of the through hole 25. The through-hole 25 forms an inner peripheral flow path 27 (see FIG. 3) through which hot water supplied from the supply port 11 flows.

  As shown in FIG. 3, the through hole 25 has a plurality of inner peripheral fins 25 a that protrude to the inner periphery along the flow direction of the hot water. The inner peripheral fin 25a increases the heat transfer area in the inner peripheral flow path 27 as compared with the case where the inner peripheral fin 25a is not provided. The plurality of inner peripheral fins 25 a are formed at equiangular intervals over the entire circumference of the through hole 25.

  The outer wall portion 26 forms an outer peripheral flow path 28 through which the hot water flows continuously with the inner peripheral flow path 27 between the inner wall 17 of the tank 10. The outer peripheral channel 28 guides the hot water flowing from the inner peripheral channel 27 to the discharge port 12. The outer wall portion 26 has a larger heat transfer area than the through hole 25. Further, the outer peripheral channel 28 has a larger channel area than the inner peripheral channel 27.

  The outer wall portion 26 includes an outer wall main body 26a formed along the outer peripheral shape of the heater 21 and a plurality of outer peripheral fins 26b protruding outward from the outer wall main body 26a along the flow direction of hot water.

  The outer wall main body 26a is formed so as to cover the outer side of the heat generating portion 21c wound spirally. Since the outer wall main body 26a is provided, the heater 21 and the hot water are not in direct contact with each other.

  The outer peripheral fins 26b increase the heat transfer area in the outer peripheral flow path 28 as compared with the case where the outer peripheral fins 26b are not provided. The outer peripheral fins 26 b extend substantially parallel to the bottom surface 13 and the top surface 16 of the tank 10. The outer peripheral fins 26 b are formed larger as they are closer to the top surface 16 as compared with the central portion of the tank 10 in the height direction. The outer peripheral fins 26b are formed so as to face the pair of opposing wall surfaces 14 of the tank 10 with a predetermined interval. A lower portion of the outer wall portion 26 is formed on the bottom surface 13 of the tank 10 so as to have a predetermined interval.

  As described above, the heater unit 20 includes the heating unit 22 formed so as to cover the periphery of the heater 21. The heating unit 22 includes a through hole 25 that has a smaller diameter than the inner periphery of the heat generating part 21c, and an outer wall part 26 that has a larger diameter than the outer periphery of the heat generating part 21c. In the heater unit 20, the surface area of the heating unit 22 is a heat transfer area for exchanging heat with hot water, so the total surface area of the through holes 25 and the outer wall part 26 is the heat transfer area. Therefore, compared with the case where the heater 21 and warm water are made to contact directly, the heat transfer area for heat exchange with warm water can be enlarged.

  As shown in FIG. 2, the top plate 23 is formed longer in the axial direction of the heater unit 20 than the opening 15 of the tank 10. A connector (not shown) for connecting the fluid heating device 100 to a power supply device or a host controller (not shown) mounted on the vehicle is provided at a portion of the top plate portion 23 that protrudes from the tank 10.

  The top plate portion 23 is welded to the outer peripheral edge of the opening 15 in a state where the heater unit 20 is inserted into the tank 10. The top plate portion 23 forms the top surface 16 of the tank 10. The top surface 16 faces the bottom surface 13 of the tank 10 substantially in parallel.

  As shown in FIG. 1, the fluid heating device 100 includes a bimetal switch 31 and a heater temperature sensor 32 as a temperature detector that detects the temperature of the heater 21, and detects the temperature of hot water flowing around the heating unit 22. A water temperature sensor 33.

  The top plate portion 23 is provided with a support 76 for attaching the bimetal switch 31 as a temperature switch, a support 77 for attaching the heater temperature sensor 32, and a cylinder 78 for attaching the water temperature sensor 33. It is done.

  The bimetal switch 31 detects the temperature of the heater unit 20 and switches according to the detected temperature. Specifically, the bimetal switch 31 cuts off the supply of power to the heater unit 20 when the temperature of the heater unit 20 rises above the first set temperature. When the temperature of the heater unit 20 falls below a second set temperature that is lower than the first set temperature, the bimetal switch 31 is switched again so that the supply of power to the heater unit 20 is resumed. Also good.

  The heater temperature sensor 32 detects the temperature of the heater 21 in the heater unit 20. The heater temperature sensor 32 sends an electrical signal corresponding to the detected temperature of the heater 21 to the control board 40. The control board 40 stops the supply of power to the heater 21 when the temperature of the heater 21 detected by the heater temperature sensor 32 is higher than the set temperature.

  The water temperature sensor 33 detects the temperature of hot water in the vicinity of the discharge port 12 of the tank 10. That is, the water temperature sensor 33 detects the temperature of the heated hot water discharged from the tank 10. The water temperature sensor 33 is provided inside a protrusion 23 a (see FIGS. 2 and 3) that protrudes from the top plate 23 into the tank 10. The water temperature sensor 33 sends an electrical signal corresponding to the detected temperature of the hot water to the control board 40. The control board 40 controls the supply of electric power to the heater 21 so that the temperature of the hot water detected by the water temperature sensor 33 becomes a desired temperature.

  As shown in FIG. 2, a pair of IGBTs (Insulated Gate Bipolar Transistors) 34 and 35 are in contact with the top plate portion 23 as switching elements.

  The IGBTs 34 and 35 are connected to a vehicle power supply device via the bus bar module 30. The IGBTs 34 and 35 are connected to the control board 40 and perform a switching operation in response to a command signal from the control board 40. The IGBTs 34 and 35 control power supply to the heater unit 20 by a switching operation. Thereby, the heater unit 20 is adjusted to a desired temperature, and the hot water discharged from the discharge port 12 is adjusted to a desired temperature.

  The IGBTs 34 and 35 generate heat by repeating the switching operation. The maximum temperature at which the IGBTs 34 and 35 can operate is higher than the temperature of hot water flowing in the tank 10. Therefore, the IGBTs 34 and 35 are cooled by releasing heat to the hot water flowing in the tank 10 via the top plate part 23.

  As shown in FIG. 1, the bus bar module 30 is stacked on top of the top plate portion 23. The bus bar module 30 is formed in a small rectangle as compared with the top plate portion 23. The bus bar module 30 has a conductive connection member formed of a metal plate capable of supplying electric power and electric signals.

  The control board 40 is stacked on top of the bus bar module 30. The control board 40 is formed in a small rectangle as compared with the top plate part 23. The control board 40 is electrically connected to the bus bar module 30 and the IGBTs 34 and 35. The control board 40 controls the IGBTs 34 and 35 based on commands from the host controller.

  The cover 50 is provided on the upper part of the control board 40. The cover 50 is formed in the substantially same outer peripheral shape as the top plate portion 23. The cover 50 is welded to the outer peripheral edge of the top plate portion 23. The cover 50 seals the internal space between the top plate portion 23.

  Next, the operation of the fluid heating device 100 will be described.

  Hot water is supplied from the supply port 11 and guided to the inner circumferential flow path 27. In the inner peripheral flow path 27, hot water is heated by heat exchange with the inner periphery of the through hole 25 in which the inner peripheral fin 25a is formed. At this time, the warm water is rectified by the inner peripheral fins 25a formed along the flow direction of the warm water.

  The hot water that has passed through the inner peripheral channel 27 collides with the wall surface 14 facing the supply port 11 in the tank 10, changes its direction, and is guided to the outer peripheral channel 28. The hot water flowing through the outer peripheral flow path 28 is further heated by heat exchange with the outer wall main body 26a and the outer peripheral fin 26b. Also at this time, the warm water is rectified by the peripheral fins 26b formed along the flow direction of the warm water. Then, the heated warm water is discharged from the discharge port 12.

  Here, the outer peripheral channel 28 has a larger channel area than the inner peripheral channel 27. Therefore, the flow rate of hot water in the outer peripheral flow path 28 is slower than the flow rate of hot water in the inner peripheral flow path 27. However, the outer wall portion 26 facing the outer peripheral flow path 28 has a larger heat transfer area than the through hole 25 forming the inner peripheral flow path 27. Therefore, the temperature rise rate of the hot water in the inner peripheral channel 27 and the outer peripheral channel 28 can be made substantially constant.

  The fluid heating device 100 is not limited to the above-described configuration, and the hot water supplied from the supply port 11 flows through the outer peripheral flow channel 28 and then flows through the inner peripheral flow channel 27 and is discharged from the discharge port 12. Good.

  Next, with reference to FIG. 4, the process of manufacturing the fluid heating apparatus 100 will be described.

  In the installation process shown in FIG. 4A, the heater 21 is installed inside the mold 60.

  The mold 60 has a molding surface 60 a for die casting (casting) the outer shapes of the heating unit 22 and the top plate unit 23. The mold 60 is combined with another mold (not shown) and the slide mold 62 to form a sealed space.

  The mold 60 is provided with pins 63 to 68 as a plurality of jigs that protrude from the molding surface 60 a and support the heater 21.

  The pin 68 is formed in a cylindrical shape that fits in the support hole 60c of the mold 60 so as to be able to advance and retract. The tip portion 68 a of the pin 68 is formed in a tapered shape that protrudes from the molding surface 60 a toward the heater 21. A bottomed tubular cylinder 78 is fitted and attached to the tip 68a of the pin 68. Similarly, bottomed cylindrical supports 71, 76, and 77 are fitted and attached to the tips of the pins 63 to 67 with respect to the mold 60, respectively.

  The pins 66 to 68 protrude downward from the molding surface 60a. Each pin 63 protrudes downward from the molding surface 60a.

  A plurality (three) of support bodies 71 are in contact with the lower portion of the spiral heat generating portion 21c. Supports 76 and 77 abut on the upper portion of the heat generating portion 21c. One terminal 21 b is inserted into the hole 60 b of the mold 60. Similarly, the other terminal 21a is inserted into a hole (not shown) of the mold 60. Thereby, the heater 21 is installed at a predetermined position inside the mold 60.

  The surfaces of the supports 71, 76, 77 and the cylindrical body 78 that are in contact with the heating part 22 are made of the same metal as the heating part 22, and more preferably are formed of a metal having a higher melting point than the heating part 22. Here, the supports 71, 76, 77 and the cylinder 78 are made of the same metal as the heating unit 22, and more preferably are formed of an aluminum alloy having a higher melting point than the heating unit 22.

  A slide mold 62 is inserted into the mold 60 inside the heat generating portion 21c. The slide mold 62 has a molding surface 62 a for molding the through hole 25 (inner peripheral fin 25 a) of the heating unit 22.

  4B, the molten metal 29 is filled into the mold 60 from the filling port (not shown) of the mold 60. In the molding process shown in FIG. Inside the mold 60, the heating part 22 and the top plate part 23 are formed by the molten metal 29 being cooled and solidified.

  The outer surface of the heater 21 and the surfaces of the supports 71, 76, 77 and the cylindrical body 78 that are in contact with the heating unit 22 are formed of a metal having a melting point higher than that of the heating unit 22. It is prevented that the supports 71, 76, 77 and the cylinder 78 are melted by the heat received from the molten metal forming the heating unit 22.

  Subsequently, in the step shown in FIG. 4C, after the pins 63 to 68 are extracted from the inside of the mold 60, the heater unit 20 is taken out from the mold 60.

  In the heater unit 20 taken out, supports 71, 76, 77 and a cylindrical body 78 are cast into the heating unit 22, and terminals 21 a, 21 b protrude from the heating unit 22. The support 71 has holes 71a from which the pins 63 to 65 are respectively extracted. Similarly, holes 76a, 77a, 78a from which pins 66 to 68 are extracted are opened in the support bodies 76, 77 and the cylindrical body 78.

  Subsequently, in the assembly process, the open end of the tank 10 is welded to the top plate portion 23 of the heater unit 20 (see FIGS. 2 and 3).

  Further, in the assembly process, the bimetal switch 31, the heater temperature sensor 32, and the water temperature sensor 33 are interposed in the supports 76 and 77 and the cylindrical body 78 of the heater unit 20, respectively. The bimetal switch 31, the heater temperature sensor 32, and the water temperature sensor 33 are interposed such that the outer surfaces thereof are in contact with the inner surfaces of the supports 76 and 77 and the holes 76 a, 77 a, and 78 a of the cylindrical body 78.

  Finally, the bus bar module 30, the control board 40, and the cover 50 are assembled on the heater unit 20.

  According to the above embodiment, there exist the effects shown below.

  In the fluid heating apparatus 100, the heating unit 22 is molded so as to cover the heater 21, and the heating unit 22 is molded in a state where the heater 21 is supported on the mold 60 that molds the heating unit 22. It was set as the structure provided with the support bodies 71,76,77 casted integrally, and the cylinder 78. FIG.

  The manufacturing method of the fluid heating apparatus 100 includes an installation process in which the heater 21 is installed in the mold 60 via the supports 71, 76, 77 and the cylinder 78, and the mold 60 is filled with molten metal. The heating part 22 which covers the circumference | surroundings of the heater 21 is provided with the shaping | molding process which casts support body 71,76,77 and the cylindrical body 78, and shape | molds it integrally.

  Based on the above configuration, the structure in which the heater 21 and the support 71 are cast into the heating unit 22, the hot water does not directly contact the surface of the heater 21. Thereby, compared with the case where the heater 21 and warm water are made to contact directly, the heat transfer area which heat-exchanges with warm water is fully ensured, and it is suppressed that warm water is heated locally.

  In the structure in which the supports 71, 76, 77 and the cylindrical body 78 are not cast into the heating unit 22, a pin that supports the heater 21 is inserted into the mold 60 that molds the heating unit 22, and the molded heating unit A pin is extracted from the pin 22. In this case, since the hole from which the pin has been extracted opens in the heater 21 in the heating unit 22, the hot water directly contacts the heater 21. For this reason, when the output of the heater 21 is increased, there is a possibility that the hot water that directly contacts the heater 21 is locally heated.

  The fluid heating device 100 is configured such that warm water flows around the heating unit 22 and the support 71.

  Based on the above configuration, the hot water circulates around the heating unit 22 and the support 71, so that a heat transfer surface that exchanges heat with the hot water is sufficiently secured, and the hot water is prevented from being locally heated. .

  For example, the support 71 may be provided so as to come into contact with the bottom surface 13 of the tank 10 so that the hot water does not flow around the support 71. In this case, the heating unit 22 and the bottom of the tank 10 are connected to each other via the support 71. Then, by forming the support 71 with a material having lower thermal conductivity than the heating unit 22 or the tank 10, it is possible to suppress the heat of the heater 21 from being transmitted to the outside air via the support 71 and the tank 10.

  In the fluid heating apparatus 100 according to the present embodiment, compared to the above-described structure in which hot water directly contacts the surface of the heater 21, the hot water is prevented from boiling when the output of the heater 21 is increased, and the heater 21 heats the hot water. Heat exchange efficiency is increased.

  The heating unit 22 is formed of a metal (for example, stainless steel) different from a metal (for example, an aluminum alloy) that forms the outer surface of the heater 21.

  Based on the above configuration, the outer surface of the heater 21 is prevented from melting in the process of casting the heater 21 into the heating unit 22.

  At least the surfaces of the supports 71, 76, 77, and the cylindrical body 78 that are in contact with the heating unit 22 are made of a metal similar to the heating unit 22.

  Based on the above configuration, when the support bodies 71, 76, 77 and the cylinder body 78 are cast into the heating unit 22, the surfaces of the support bodies 71, 76, 77 and the cylinder body 78 and the heating section 22 are similar. Metals melt and bond. Also in this case, since the support body 71 is interposed between the hot water and the heater 21, it is avoided that the hot water is in direct contact with the heater 21, and the hot water can be prevented from boiling. And since the support body 71 and the heating part 22 closely_contact | adhere and it is prevented that a space | gap arises between both, the heat exchange efficiency at the time of the heater 21 heating warm water is improved.

  The support members 71, 76, 77 and the cylinder body 78 are not limited to the above-described configuration, and may be formed of a metal different from the heating unit 22.

  Based on the above configuration, for example, the supports 71, 76, 77 and the cylinder 78 can be formed of a copper-based metal having a high heat transfer coefficient. Also in this case, since the support body 71 is interposed between the hot water and the heater 21, it is avoided that the hot water is in direct contact with the heater 21, and the hot water can be prevented from boiling. And compared with the case where the support body 71 is formed with an aluminum-based metal, the heat exchange efficiency by which the heater 21 heats the hot water through the support body 71 having a high thermal conductivity is enhanced.

  Further, for example, the surfaces of the supports 71, 76, 77 and the cylinder 78 may be formed of an aluminum-based metal, and the main body portion other than the surface may be formed of a copper-based metal having a high heat transfer coefficient. In this case, when the supports 71, 76, 77 and the cylinder 78 are cast into the heating unit 22, the surfaces of the supports 71, 76, 77 and the cylinder 78 and the heating unit 22 are the same. Metals melt and bond. And the heat exchange efficiency in which the heater 21 heats warm water through the support body 71 mainly composed of copper-based metal having high thermal conductivity is enhanced.

  The support bodies 71, 76, 77 and the cylinder body 78 are configured to be supported by the tip portions of the pins 63 to 68 that advance and retreat with respect to the mold 60.

  Based on the above configuration, the supports 71, 76, 77 and the cylindrical body 78 can be cast at arbitrary positions with respect to the heating unit 22.

  The support body 76 is provided between the heater 21 and the bimetal switch 31. Heat of the heater 21 is transmitted to the bimetal switch 31 through the bottom of the support 76.

  The support body 77 is provided between the heater 21 and the heater temperature sensor 32. Heat of the heater 21 is transmitted to the heater temperature sensor 32 through the bottom of the support 77.

  The cylindrical body 78 is surrounded by the heating unit 22. The heat of the hot water flowing through the outer peripheral flow path 28 is transmitted to the water temperature sensor 33 via the heating unit 22 and the bottom of the cylindrical body 78. Not limited to this, the bottom of the cylindrical body 78 may be exposed from the heating unit 22 to the tank 10 and exposed to warm water flowing through the outer peripheral flow path 28. In this case, the heat of the hot water flowing through the outer peripheral flow path 28 is transmitted to the water temperature sensor 33 via the cylindrical body 78.

  The embodiment of the present invention has been described above. However, the above embodiment only shows a part of application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.

21 Heater 22 Heater 60 Die 63-68 Pin (Jig)
68a Tip portion 71 Support body 100 Fluid heating device

Claims (7)

A fluid heating device in which a heater heats a fluid,
A heating unit that is molded to cover the heater;
A fluid heating apparatus comprising: a support body in which the heating section is molded in a state where the heater is supported on a mold for molding the heating section and is integrally cast into the heating section. The fluid heating device according to claim 1,
A fluid heating apparatus, wherein a fluid flows around the heating unit and the support. The fluid heating device according to claim 1 or 2,
The fluid heating device, wherein the heating unit is formed of a metal different from a metal forming an outer surface of the heater. The fluid heating apparatus according to any one of claims 1 to 3,
The fluid heating apparatus according to claim 1, wherein at least a surface of the support that contacts the heating unit is formed of a metal similar to the heating unit. The fluid heating device according to any one of claims 1 to 4,
The fluid heating device according to claim 1, wherein the support is formed of a metal different from the heating unit. A method of manufacturing a fluid heating apparatus in which a heater heats a fluid,
An installation step of installing the heater through a support in a mold;
A heating step of filling the mold with molten metal and covering the periphery of the heater, and casting the support to form a unitary body. It is a manufacturing method of the fluid heating device according to claim 6,
The method of manufacturing a fluid heating apparatus, wherein the support is supported by a tip portion of a jig that advances and retreats with respect to the mold.

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