JP6431831B2 - Fluid heating apparatus and manufacturing method thereof - Google Patents

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.

  The fluid heating device includes a housing member provided in contact with the heater, and a bimetal switch housed in the housing member. The bimetal switch is configured to switch the energization state of the heater when the heat of the heater is transmitted through the housing member and the temperature of the heater reaches a set temperature.

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.

  In addition, as a countermeasure, when the heat transfer area in contact with the fluid is increased by covering the periphery of the heater with another member or the like, it is difficult to secure a heat transfer path for transmitting the heat of the heater to the bimetal switch. Therefore, there is a possibility that the accuracy of detecting the temperature of the heater cannot be sufficiently increased.

  The present invention has been made in view of the above problems, and even when the output of the heater is increased, the fluid is efficiently heated, and the temperature detector accurately detects the temperature of the heater; An object of the present invention is to provide a fluid heating device and a method for manufacturing the same.

According to an aspect of the present invention, the heater is a fluid heating device that heats a fluid, and the heater is cast and formed so as to cover the heater, and the heating unit is molded. A heat conduction member that is integrally cast in the heating portion, and a temperature detector that is interposed in the heat conduction member and detects the temperature of the heater, and fluid flows around the heating portion. A fluid heating device is provided.

  According to another aspect of the present invention, there is provided a method of manufacturing a fluid heating apparatus in which a heater heats a fluid, the installation step of installing a heater and a heat conducting member in a mold, and a molten metal in the mold A fluid heating apparatus comprising: a molding step in which a heating portion that fills and surrounds the heater is cast by integrally molding a heat conduction member; and an assembly step in which a temperature detector that detects the temperature of the heater is assembled to the heat conduction member. A manufacturing method is provided.

  According to the said aspect, the fluid distribute | circulates around a heating part by the structure where a heater is cast in a heating part. Therefore, since the fluid does not directly contact the surface of the heater, a sufficient heat transfer area for heat exchange with the fluid is ensured compared to the case where the fluid is directly contacted with the heater, and the fluid is locally Heating is suppressed.

  And in a fluid heating apparatus, the heat of a heater is conducted to a temperature detector through a heat conduction member cast integrally with a heating part. Thereby, the heat transfer path which conveys the heat of a heater to a temperature detector is ensured.

  Therefore, even when the output of the heater is increased, it is possible to both efficiently heat the fluid and accurately detect the temperature of the heater.

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.

  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.

  A heat conduction member 76 for attaching the bimetal switch 31 as a temperature switch, a heat conduction member 77 for attaching the heater temperature sensor 32, and a heat conduction member 78 for attaching the water temperature sensor 33 to the top plate portion 23. Are provided.

  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 configuration described above, and the hot water supplied from the supply port 11 may flow through the outer peripheral flow channel 28 and then flow through the inner peripheral flow channel 27 and be 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 67 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 cylindrical heat conducting member 78 is fitted and attached to the tip 68 a of the pin 68. Similarly, the support 71 and the heat conducting members 76 and 77 are fitted and attached to the tips of the pins 63 to 67 with respect to the mold 60.

  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. At the top of the heating portion 21c, the heat conducting member 76, 77 a plurality (two) abuts. 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 support 71 and the heat conducting members 76 to 78 that are in contact with the heating unit 22 are made of the same metal as the heating unit 22, and more preferably are formed of a metal having a higher melting point than the heating unit 22. Here, the support body 71 and the heat conductive members 76 to 78 are the same metal as the heating unit 22, and more preferably are formed of an aluminum alloy having a melting point higher than that of 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, the support 71 and the surface of the heat conducting members 76 to 78 that are in contact with the heating unit 22 are formed of a metal having a higher melting point than the heating unit 22. 71 and the heat conducting members 76 to 78 are prevented from being 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 extracted heater unit 20, the support 71 and the heat conducting members 76 to 78 are cast into the heating unit 22, and the terminals 21 a and 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 and 78a from which pins 66 to 68 are extracted are opened in the heat conducting members 76 to 78, respectively.

  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 heat conducting members 76 to 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 surface contact with the inner surfaces of the holes 76a, 77a, and 78a of the heat conducting members 76 to 78, respectively.

  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.

  The fluid heating device 100 includes a heating unit 22 that is molded so as to cover the periphery of the heater 21, heat conduction members 76 to 78 that are integrally cast into the heating unit 22 when the heating unit 22 is molded, and heat conduction. A configuration comprising a bimetal switch 31, a heater temperature sensor 32, and a water temperature sensor 33 (temperature detector) that are interposed in the members 76 to 78 to detect the temperature of the heater 21, and the hot water circulates around the heating unit 22. It was.

  And the manufacturing method of the fluid heating apparatus 100 includes an installation step of installing the heater 21 and the heat conducting members 76 to 78 in the mold 60, and a heating unit that fills the mold 60 with molten metal and covers the periphery of the heater 21. 22 is formed by integrally molding the heat conducting members 76 to 78, the bimetallic switch 31 for detecting the temperature of the heater 21 in the heat conducting members 76 to 78 cast in the heating unit 22, and the heater temperature sensor 32. And an assembling process for abutting and assembling the water temperature sensor 33 (temperature detector).

  Based on the above configuration, warm water circulates around the heating unit 22 due to the structure in which the heater 21 is cast into the heating unit 22. Therefore, since the warm water does not directly contact the surface of the heater 21, compared with the case where the heater 21 and the warm water are directly contacted, a heat transfer area for exchanging heat with the warm water is sufficiently secured, and the warm water is Local heating is suppressed.

  In the fluid heating apparatus 100, the heat of the heater 21 is conducted to the bimetal switch 31, the heater temperature sensor 32, and the water temperature sensor 33 through the heat conducting members 76 to 78 cast into the heating unit 22.

  The heat conducting members 76 to 78 are configured to have the inner surfaces of the holes 76a, 77a, and 78a as contact portions that are in surface contact with the bimetal switch 31, the heater temperature sensor 32, and the water temperature sensor 33.

  Since the heat conducting members 76 to 78 are formed separately from the heating unit 22, the inner surfaces of the holes 76 a, 77 a, 78 a have a smaller surface roughness than the outer surface of the heating unit 22 to be cast, The gap interposed in the heat transfer path through which the heat of the heater 21 is transmitted can be reduced. Thereby, the bimetal switch 31, the heater temperature sensor 32, and the water temperature sensor 33 have a sufficient heat transfer area (cross-sectional area of the heat transfer path) through which the heat of the heater 21 is transmitted.

  On the other hand, in the structure in which the bimetal switch 31, the heater temperature sensor 32, and the water temperature sensor 33 are assembled in direct contact with the heating unit 22, the surface roughness of the heating unit 22 to be cast is large. A heat transfer area (cross-sectional area of the heat transfer path) through which heat is transferred cannot be secured sufficiently. Thereby, the bimetal switch 31, the heater temperature sensor 32, and the water temperature sensor 33 can improve the accuracy of detecting the temperature of the heater 21.

  Therefore, even when the output of the heater 21 is increased, it is possible to both efficiently heat the hot water and accurately detect the temperature of the heater 21.

The fluid heating apparatus 100 is configured such that the heat conducting members 76 and 77 cast into the heating unit 22 abut on the heater 21.

  Based on the above configuration, when the heating unit 22 is molded using the mold 60, the heater 21 is supported at a predetermined position in the mold 60 by the heat conducting member 76. Thereby, the assembly | attachment precision of the heater 21 can be raised.

  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 support 71 and the heat conducting members 76 to 78 that are in contact with the heating unit 22 are formed of a metal similar to the heating unit 22.

Based on the above configuration, when the support 71 and the heat conducting members 76 to 78 are cast into the heating unit 22, the surfaces of the support 71 and the heat conducting members 76 to 78 and the heating unit 22 are melted by the same metal. And combine. Also in this case, since the support body 71 is interposed between the heater 21 and the hot water, 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. Furthermore, since it is prevented that the heat conducting members 76 to 78 and the heating unit 22 are in close contact with each other to form a gap between them, the accuracy with which the bimetal switch 31 and the heater temperature sensor 32 detect the temperature of the heater 21 , And the precision which the water temperature sensor 33 detects the temperature of warm water is raised.

  In addition, not only the structure mentioned above but the support body 71 and the heat conductive members 76-78 are good also as a structure formed with the metal different from the heating part 22. FIG.

Based on the above configuration, for example, the support 71 and the heat conducting members 76 to 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 heater 21 and the hot water, 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 heat conductivity of the support body 71 increases compared with the case where the support body 71 and the heat conductive members 76-78 are formed with an aluminum-type metal, the heat exchange efficiency at the time of the heater 21 heating warm water increases. It is done. Furthermore, since the thermal conductivity of the heat conducting members 76 to 78 is increased, the accuracy with which the bimetal switch 31 and the heater temperature sensor 32 detect the temperature of the heater 21 and the accuracy with which the water temperature sensor 33 detects the temperature of the hot water can be increased. . And the heat exchange efficiency at the time of the heater 21 heating warm water is improved.

For example, the surfaces of the support 71 and the heat conducting members 76 to 78 may be formed of an aluminum-based metal, and the main body other than the surface may be formed of a copper-based metal having a high heat transfer coefficient. In this case, when the support 71 and the heat conducting members 76 to 78 are cast into the heating unit 22, the same metal is melted between the surface of the support 71 and the heat conducting members 76 to 78 and the heating unit 22. And combine. And the heat exchange efficiency at the time of the heater 21 heating warm water through the support body 71 which mainly has a copper-type metal with high heat conductivity is improved. Furthermore, the accuracy with which the bimetal switch 31 and the heater temperature sensor 32 detect the temperature of the heater 21 through the heat conductive members 76 to 78 mainly composed of copper-based metal having high thermal conductivity, and the water temperature sensor 33 is the hot water . The accuracy of detecting the temperature can be further increased.

  The heat conducting members 76 to 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 heat conducting members 76 to 78 can be cast at any position with respect to the heating unit 22.

  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.

In the above embodiment, the heat conducting members 76 and 77 cast into the heating unit 22 abut on the heater 21. Not limited to this, the heat conducting members 76 and 77 cast into the heating unit 22 may be separated from the heater 21, and the portion of the heating unit 22 may be interposed between the heat conducting members 76 and 77 and the heater 21. . In this case, the heat of the heater 21 is conducted to the heating unit 22 and the heat conduction member 76, 77 to the bimetal switch 31 and the heater temperature sensor 32 through, respectively.

21 Heater 22 Heating part 31 Bimetal switch (temperature detector)
32 Heater temperature sensor (temperature detector)
33 Water temperature sensor (temperature detector)
60 Mold 63-68 Pin (Jig)
76-78 heat conduction member 76a, 77a, 78a hole (contact part)
100 Fluid heating device

Claims (8)

A fluid heating device in which a heater heats a fluid,
A heating unit in which the heater is cast and formed to cover the periphery of the heater;
A heat conduction member that is integrally cast into the heating unit when the heating unit is molded;
A temperature detector interposed in the heat conducting member to detect the temperature of the heater,
A fluid heating apparatus, wherein a fluid circulates around the heating unit. The fluid heating device according to claim 1,
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 device according to claim 1 or 2,
The fluid heating apparatus, wherein the heat conducting member abuts on the heater. The fluid heating apparatus according to any one of claims 1 to 3,
The fluid heating device, wherein the heat conducting member has a contact portion in surface contact with the temperature detector. The fluid heating device according to any one of claims 1 to 4,
The fluid heating apparatus according to claim 1, wherein at least a surface of the heat conducting member 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 5,
The fluid heating device, wherein the heat conducting member is made 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 and the heat conduction member in a mold;
A molding step of filling the molten metal into the mold and covering the periphery of the heater by casting the heat conductive member and integrally molding the heating portion,
And a step of assembling a temperature detector for detecting the temperature of the heater to the heat conducting member. It is a manufacturing method of the fluid heating device according to claim 7,
The method of manufacturing a fluid heating apparatus, wherein the heat conducting member is supported by a tip portion of a jig that advances and retreats with respect to the mold.

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