JP2019087358A - Fluid heating module and manufacturing method therefor - Google Patents

Abstract

To provide a fluid heating module and manufacturing method therefor, capable of suppressing enlargement in even such a configuration as to use a plurality of heating elements whose calorific values are different from each other.SOLUTION: The fluid heating module 10 includes: a first heating element (a heater 410); a second heating element (a switching element 420) whose calorific value is smaller than the first heating element; and a plurality of tubes 200, of a tubular member formed so that fluid runs in it and arranged to align with the first heating element each other along the lamination direction. If the one of the plurality of tubes 200 arranged at the outermost end position along the lamination direction is an end tube 210, the second heating element is arranged at a more outward position than the end tube 210 along the lamination direction.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a fluid heating module for heating a fluid, and a method of manufacturing the same.

  Patent Document 1 below describes a cooler module for cooling an object to be cooled, such as an electronic component, by heat exchange with cooling water. The said cooler module becomes a structure which laminated | stacked alternately the tube by which the flow path through which cooling water flows was formed inside, and the electronic component which is cooling object along the lamination direction.

  The electronic component is cooled by heat exchange with the cooling water flowing in the tube. On the other hand, the cooling water flowing in the tube is heated by the heat generated by the electronic component to raise its temperature. The present inventors are studying the use of such a cooler module as a "fluid heating module" for heating a fluid. For example, if a heating element such as an electric heater is disposed between the tubes instead of the electronic components, a fluid such as cooling water can be heated. Such a fluid heating module can be used as an apparatus or the like for rapidly raising the temperature of the coolant when the vehicle is warmed up.

JP, 2017-45971, A

  By the way, as a heat generating body which is a heat source of a fluid heating module, it may be desired to use a plurality of types of heat generating elements having different amounts of heat generation. For example, since the switching element for adjusting the magnitude of the power supplied to the electric heater generates heat during operation, it can be used as a heating element for fluid heating together with the electric heater. Although the calorific value of the switching element is small compared to the electric heater, it is possible to more efficiently heat the fluid by effectively utilizing the heat generated by the switching element.

  The size of the heating element having a larger calorific value (hereinafter also referred to as "first heating element") is larger than the size of the heating element having a small calorific value (hereinafter also referred to as "second heating element") There are many. For this reason, in a portion in which a small second heating element is sandwiched between adjacent tubes, the gap between the tubes needs to be smaller than the other gaps.

  However, if the gap between the tubes is reduced only in part, the amount of deformation of the tubes and the like at the time of manufacture may vary, and there is a concern that the pressure loss of the fluid may be increased in part. For this reason, it is desirable that the gaps between the adjacent tubes be uniform as a whole including the portion in which the second heating element is sandwiched.

  It is also conceivable to match the size of the second heat generating body having a small heat generation amount to the size of the first heat generating body having a large heat generation amount in order to make the gap between adjacent tubes uniform as a whole. However, in such a configuration, the second heating element is unnecessarily enlarged, and as a result, the entire fluid heating module is enlarged.

  An object of the present disclosure is to provide a fluid heating module capable of suppressing an increase in size while using a plurality of heating elements having different amounts of heat generation, and a method of manufacturing the same.

  The fluid heating module (10) according to the present disclosure is formed such that a fluid flows inside the first heating element (410), the second heating element (420) which generates a smaller amount of heat than the first heating element, and And a plurality of tubes (200) which are tubular members arranged alternately with the first heating element along the stacking direction. When the end tube (210) of the plurality of tubes disposed at the endmost position along the stacking direction is used as the end tube (210), the second heating element is located outside the end tube along the stacking direction Are located at

  In the fluid heating module having such a configuration, the second heating element having a small heat generation amount is not disposed between the adjacent tubes, but at a position outside the end tube along the stacking direction. It is arranged. For this reason, even when the size of the second heat generating body is smaller than the size of the first heat generating body, the gap between the tubes can be made uniform throughout. In addition, the tube is not disposed at a position further outside the second heating element. For this reason, the dimensions of the fluid heating module along the stacking direction can be reduced.

  In the above, "a position outside the end tube" refers to a position on the opposite side of the end tube from the side where the other tubes are disposed.

  In the fluid heating module configured as described above, the first heating element having a large calorific value is cooled by the two tubes disposed on both sides thereof. On the other hand, the second heating element with a small heating value is cooled by one tube (end tube) disposed on one side thereof. As a result, in the fluid heating module configured as described above, the cooling performance of each tube becomes appropriate in accordance with the calorific value of each heating element. As a result, it is possible to prevent a situation where the second heating element with a small amount of heat generation is excessively cooled.

  According to the present disclosure, there is provided a fluid heating module capable of suppressing an increase in size while using a plurality of heating elements having different amounts of heat generation, and a method of manufacturing the same.

FIG. 1 is a view showing the configuration of a fluid heating module according to the present embodiment. FIG. 2 is a side view of the fluid heating module of FIG. FIG. 3 is a diagram for explaining a method of manufacturing a fluid heating module. FIG. 4 is a diagram for explaining a method of manufacturing a fluid heating module. FIG. 5 is a diagram for explaining the method of manufacturing the fluid heating module. FIG. 6 is a diagram for explaining the method of manufacturing the fluid heating module. FIG. 7 is a view showing the configuration of a fluid heating module according to a modification of the present embodiment. FIG. 8 is a view showing a configuration of a fluid heating module according to a comparative example.

  Hereinafter, the present embodiment will be described with reference to the attached drawings. In order to facilitate understanding of the description, the same constituent elements in the drawings are denoted by the same reference numerals as much as possible, and redundant description will be omitted.

  The configuration of the fluid heating module 10 according to the present embodiment will be described with reference to FIGS. 1 and 2. The fluid heating module 10 is a device mounted on a vehicle (not shown), and is for heating cooling water (LLC) when the vehicle is warmed up or the like. The fluid to be heated by the fluid heating module 10 may be cooling water as in the present embodiment, but may be another fluid (for example, a refrigerant or the like).

  As shown in FIG. 1, the fluid heating module 10 includes a case 100, a lid 600, a tube 200, a pipe 300, a heater 410, a plate 500, a switching element 420, and a pressurizing unit 700. Is equipped.

  The case 100 is a container that generally divides the outer shape of the fluid heating module 10, and a heater 410, which will be described later, and the like are accommodated inside the case 100. The shape of the case 100 is a substantially rectangular parallelepiped, and an opening 101 is formed on one surface (the surface on the right side in FIG. 1). The opening 101 is a rectangular opening formed to insert the heater 410 and the like from the outside. The opening 101 is covered from the outside by a lid 600 described later.

  Among the plurality of walls constituting the case 100 which is a rectangular parallelepiped, the wall in which the opening 101 is formed is hereinafter referred to as “the wall 110”. In addition, the wall facing the wall 110 (the left wall in FIG. 1) is hereinafter referred to as “wall 120”. Furthermore, a wall perpendicular to each of the wall 110 and the wall 120, and connecting the wall 110 and the wall 120 on the upper side of FIG. 1 is referred to as “wall 131”. In addition, a wall perpendicular to each of the wall 110 and the wall 120 and connecting the wall 110 and the wall 120 on the lower side of FIG. 1 is referred to as a “wall 132”.

  In FIG. 1, the direction from the wall 120 toward the wall 110 is the x direction, and the x axis is set along the same direction. Further, the direction from the wall 132 toward the wall 131 is taken as the y direction, and the y axis is set along the same direction. Furthermore, a direction perpendicular to both the x direction and the y direction, which is a direction from the back side to the front side in the drawing of FIG. 1, is the z direction, and the z axis is set along the same direction. The same applies to the following figures.

  The lid 600 is a plate-like member that covers the opening 101 formed in the wall 110 from the x direction side. FIG. 2 is a view of the fluid heating module 10 of FIG. 1 as viewed from the x direction. As shown in FIG. 2, the lid 600 is fixed to the wall 110 by a plurality of bolts 601.

  The lid 600 is formed with an introduction part 610 and a discharge part 620. Each of these is formed in a cylindrical shape, and is formed so as to protrude further in the x direction from the surface of the lid 600 in the x direction.

  The introduction part 610 is a part for receiving the cooling water supplied from the outside. The introduction portion 610 is formed in a portion on the y direction side of the lid 600. A through hole 611 is formed in the introduction portion 610. The through hole 611 is a circular hole formed to penetrate the lid 600 along the x direction. Cooling water supplied from the outside is supplied to a tube 200 or the like described later through the through hole 611.

  The discharge part 620 is a part for discharging the cooling water heated by the fluid heating module 10 to the outside. The discharge unit 620 is formed in a portion on the −y direction side of the lid 600. The discharge portion 620 is formed with a through hole 621. The through hole 621 is a circular hole formed to penetrate the lid 600 along the x direction. The cooling water heated by the fluid heating module 10 is discharged to the outside through the through holes 621.

  O-ring grooves 631 and 633 are formed on the surface of the lid 600 on the −x direction side. The O-ring groove 631 is a concave and circular groove formed so as to surround the periphery of the through hole 611. An O-ring 632 is accommodated in the O-ring groove 631. This prevents the cooling water flowing through the through hole 611 from leaking between the lid 600 and the plate 500.

  The O-ring groove 633 is a concave and circular groove formed so as to surround the through hole 621. An O-ring 634 is accommodated in the O-ring groove 633. This prevents the cooling water flowing through the through hole 621 from leaking between the lid 600 and the plate 500.

  The tubes 200 are tubular members formed so that cooling water flows inside, and a plurality (three in the present embodiment) of the fluid heating module 10 are provided. Each tube 200 has a flat shape, and the normal direction of the flat surface is arranged along the x-axis. The tube 200 is formed to extend along the y-axis. A flow passage (not shown) is formed inside the tube 200. The cooling water supplied to each tube 200 flows in the flow path in the -y direction.

  The plurality of tubes 200 are arranged to line up along the x-axis, with their flat surfaces facing each other. The direction in which the plurality of tubes 200 are arranged is hereinafter also referred to as a “stacking direction”. Among the plurality of tubes 200, those disposed at the end positions in the stacking direction are hereinafter also referred to as "end tubes 210".

  Note that the stacking direction, which is the “direction in which the plurality of tubes 200 are aligned”, may be either the x direction or the −x direction. Therefore, the end tube 210 defined as described above corresponds to both the tube 200 disposed closest to the x direction and the tube 200 disposed closest to the −x direction. However, in the following description, the tube 200 disposed particularly on the x-direction side among these will be referred to as an “end tube 210”.

  The size of the gap formed between the pair of tubes 200 adjacent to each other is uniform throughout. That is, the tubes 200 are arranged at equal intervals along the stacking direction.

  The pipe 300 is a circular tubular member provided to connect the tubes 200 adjacent to each other. Between the tubes 200 adjacent to each other, the pipe 300 is provided in the vicinity of the end in the y direction of the tube 200 and in the vicinity of the end in the −y direction. The internal space of each pipe 300 is in communication with the flow path in the tube 200. For this reason, the flow paths in the respective tubes 200 are connected in parallel with each other via the pipe 300.

  The respective pipes 300 are provided between the adjacent tubes 200 as described above, but some of the pipes 300 are also provided so as to extend from the end tube 210 in the x direction. There is. As shown in FIG. 1, the pipe 300 provided on the y-direction side of the end tube 210 extends in the x direction, and a part of the pipe 300 is inserted into the through hole 611 of the lid 600. It is done. The outer diameter of the pipe 300 is approximately equal to the inner diameter of the through hole 611.

  Similarly, a pipe 300 provided in a portion on the −y direction side of the end tube 210 extends toward the x direction side, and a part thereof is inserted through the through hole 621 of the lid 600. The outer diameter of the pipe 300 is approximately equal to the inner diameter of the through hole 621.

  The pipes 300 provided on the y-direction side of the tube 200 are linearly arranged along the x-axis, with their central axes aligned with each other. Similarly, the pipes 300 provided on the −y direction side of the tube 200 are also arranged in a straight line along the x axis, with their central axes aligned with each other. Such a pipe 300 may be formed by projecting a part of the plate material constituting the tube 200, and may be formed as a separate part from the tube 200.

  The heater 410 is an electric heater that receives power and generates heat. The heater 410 is one of the heat sources when the cooling water is heated, and corresponds to the “first heating element” in the present embodiment. A plurality of (two in the present embodiment) heaters 410 are provided. As shown in FIG. 1, each heater 410 is held in a state of being sandwiched by each tube 200 at a position where it is between a pair of tubes 200 adjacent to each other. As a result, in the fluid heating module 10, the heaters 410 and the tubes 200 are arranged alternately along the stacking direction.

  When power is supplied to the heaters 410, the heat generated by the heaters 410 heats the tubes 200, and the cooling water passing through the tubes 200 is also heated. The magnitude of the power supplied to the heater 410 is adjusted by the operation of the switching element 420 described later.

  The plate 500 is a plate-like member provided between the end tube 210 and the lid 600. The end surface 501 of the plate 500 in the x direction (that is, the surface opposite to the end tube 210) is in contact with the lid 600 from the −x direction. An end surface 502 of the plate 500 on the −x direction side is in contact with the end tube 210 from the x direction side. As shown in FIG. 2, the plate 500 and the lid 600 are fastened and fixed by a plurality of bolts 602.

  A through hole 521 is formed in a portion on the y direction side of the plate 500. The through hole 521 is a circular hole formed to penetrate the plate 500 along the x direction. The central axis and the inner diameter of the through hole 521 correspond to the central axis and the inner diameter of the through hole 611, respectively. In the through hole 521, a tip end portion of a pipe 300 extending in the x direction is inserted from a hole (not shown) formed in a portion on the y direction side of the end portion tube 210.

  Similarly, a through hole 522 is formed in a portion on the −y direction side of the plate 500. The through holes 522 are circular holes formed to penetrate the plate 500 along the x direction. The central axis and the inner diameter of the through hole 522 correspond to the central axis and the inner diameter of the through hole 621, respectively. In the through hole 522, a tip end portion of a pipe 300 extending in the x direction is inserted from a hole (not shown) formed in a portion on the -y direction side of the end portion tube 210.

  A part of the end surface 501 of the plate 500 is retracted toward the −x direction side (that is, the end tube 210 side), thereby forming a recess 510. Two recesses 510 are formed to be aligned along the y direction. These recesses 510 are spaces for arranging switching elements 420 described below. In addition, the part of the recessed part 510 in the paper surface near side and back side in FIG. 1 is covered with the wall not shown.

  The switching elements 420 are elements for adjusting the magnitude of the power supplied to the respective heaters 410. As such a switching element 420, an IGBT, a MOS-FET, etc. can be used, for example. In the present embodiment, two switching elements 420 are provided, and one switching element 420 is disposed inside the recess 510. The switching operation of the switching element 420 is controlled by a controller (not shown). The control device adjusts the amount of heat generation of the heater 410 by adjusting the duty of the switching element 420.

  Each switching element 420 has a heat dissipation surface 421 for releasing the heat generated during its operation to the outside. The heat radiation surface 421 is in contact with the bottom surface 511 which is the surface on the back side (−x direction side) of the concave portion 510. The switching element 420 is fastened and fixed to the plate 500 by a bolt 422 in a state where the heat dissipation surface 421 is in contact with the bottom surface 511.

  The pressurizing unit 700 is disposed between the wall 120 and the tube 200. The pressurizing unit 700 is for applying a compressive force to the plurality of tubes 200 and the heater 410 along the stacking direction. The pressing unit 700 has an unshown elastic member such as a leaf spring. The compressive force applied in the x direction by the pressurizing unit 700 prevents the generation of a gap between the heater 410 and the tube 200. Thereby, the thermal resistance between both is reduced.

  The operation of fluid heating module 10 will be described with continued reference to FIG. As described above, externally supplied cooling water is supplied to the fluid heating module 10 from the through hole 611 of the introduction unit 610. The cooling water is distributed to the respective tubes 200 while flowing in the -x direction through the respective pipes 300 arranged on the y direction side. Thereby, in the flow path formed in each tube 200, the cooling water flows in the -y direction. As the heat generated by the heater 410 heats the tube 200, the cooling water is heated as it passes through the tube 200 and raises its temperature.

  The cooling water passing through the respective tubes 200 merges in the respective pipes 300 arranged on the -y direction side, and flows through the pipes 300 in the x direction. Thereafter, the cooling water is discharged to the outside through the through holes 621 of the discharge unit 620.

  At this time, each switching element 420 generates heat in response to the switching operation. The heat generated by the switching element 420 is transferred from the heat dissipation surface 421 to the plate 500 and transferred to the cooling water through the plate 500 and the end tube 210.

  That is, the switching element 420 in the present embodiment, together with the heater 410, is one of the heat sources when the cooling water is heated. The switching element 420 corresponds to the “second heating element” in the present embodiment. The calorific value of the switching element 420, which is the second heating element, is smaller than the calorific value of the heater 410, which is the first heating element. However, in the fluid heating module, it is possible to more efficiently heat the fluid by effectively utilizing the heat generated by the switching element 420 without wasting it.

  By the way, as an aspect for utilizing the switching element 420 as one of the heat sources, it is also conceivable to interpose the switching element 420 between a pair of adjacent tubes 200 similarly to the heater 410. In this case, since the size of the switching element 420 is smaller than the size of the heater 410, in the portion where the switching element 420 is sandwiched, the gap between the tubes 200 is the gap in the other portion (the portion where the heater 410 is sandwiched) Needs to be smaller than the

  However, if the gap between the tubes 200 is reduced only in part, the amount of deformation of the tubes 200 and the like at the time of manufacture may vary, and there is a concern that the pressure loss of the fluid may be increased in part. For this reason, it is desirable that the gap between the tubes 200 adjacent to each other be uniform as a whole including the portion in which the switching element 420 is sandwiched.

  It is also conceivable to match the dimensions of the switching element 420 with a small amount of heat generation to the dimensions of the heater 410 with a large amount of heat generation in order to make the gap between the adjacent tubes 200 as a whole uniform. As such an example, FIG. 8 shows the configuration of a fluid heating module 10A according to a comparative example of the present embodiment. In this comparative example, switching is performed so that the dimension (dimension along the x axis) of the switching element 420A that is the second heating element matches the dimension (dimension along the x axis) of the heater 410 that is the first heating element. The element 420A is enlarged. In addition, the switching element 420A is disposed between a pair of tubes 200 adjacent to each other.

  In such a configuration, the gap between the tubes 200 is uniform throughout, but as the switching element 420A is increased in size, the dimension along the x axis of the fluid heating module is increased. There is. Further, as apparent from comparison with FIG. 1, in the comparative example, the number of tubes 200 is increased by one. This further increases the size of the fluid heating module along the x-axis.

  On the other hand, in the fluid heating module (FIG. 1) according to the present embodiment, the switching element 420 as the second heating element is not disposed between the tubes 200 adjacent to each other, but along the stacking direction. It is arrange | positioned in the position which becomes the outer side (x direction side) rather than the edge part tube 210. As shown in FIG. Thus, the size of the switching element 420 remains smaller than the size of the heater 410, but the gap between the tubes 200 is uniform throughout. Furthermore, the dimension along the x-axis of the fluid heating module 10 is smaller than that of the comparative example of FIG. 8 as described above. As described above, in the present embodiment, the increase in size of the fluid heating module 10 is suppressed while using a plurality of heating elements having different amounts of heat generation.

  In the present embodiment, a plate 500 is disposed between the switching element 420 and the end tube 210. By interposing the plate 500 between the two, the switching element 420 can be easily fixed to the end tube 210.

  In the present embodiment, the switching element 420 is disposed inside the recess 510. As a result, the water that has entered the inside of the vehicle is applied to the switching element 420, and the switching element 420 is prevented from being broken. In addition, even if the switching element 420 is abnormal and its temperature rises excessively, there is an advantage that the situation where the switching element 420 fires to the outside can be prevented.

  In the present embodiment, the switching element 420 is fixed to the plate 500 in a state where a part of the switching element 420 is in contact with the bottom surface 511 of the recess 510. Therefore, the operation of arranging and fixing the switching element 420 inside the recess 510 can be easily performed from the x direction side of the plate 500.

  In the present embodiment, the heat dissipation surface 421 of the switching element 420 is in contact with the plate 500. Thereby, the heat generated in the switching element 420 is efficiently transmitted to the plate 500. As a result, the switching element 420 can be used more efficiently as the second heating element.

  In the present embodiment, the temperature of the switching element 420 when the fluid is being heated is higher than the temperature of the heater 410 at that time. This is because the heater 410 is cooled directly by the tubes 200 on both sides, while the switching element 420 is cooled indirectly (i.e. via the plate 500) by the tubes 200 on only that one side. It is from. Because of this reason, even if the temperature of the switching element 420 rises, the cooling water flowing in the vicinity of the switching element 420 will not be heated excessively. Therefore, as the switching element 420, one having a relatively high upper limit operating temperature can be used.

  In the present embodiment, the switching element 420 and the heater 410 are disposed at substantially the same coordinates in the z direction. Therefore, in the case where the control substrate to which these are connected is disposed at a position on the front side of the paper surface of FIG. 1, the dimension of the fluid heating module 10 in the z direction can be suppressed.

  Next, a method of manufacturing the fluid heating module 10 will be described. The manufacturing method includes a preparation step, a first arrangement step, and a second arrangement step.

  In the first arrangement step, among the components constituting the fluid heating module 10, at least a plurality of tubes 200 in which the pipes 300 are formed, the switching elements 420, and the plate 500 in which the recesses 510 are formed are prepared.

  In the first arrangement step subsequent to the preparation step, first, the plurality of tubes 200 are arranged along the stacking direction. At that time, as shown in FIG. 3, the tubes 200 are connected by the pipe 300.

  Thereafter, in the first arrangement step, the plate 500 is arranged at a position outside the end tube 210 (x-direction side) along the stacking direction. Specifically, by moving the plate 500 disposed as shown in FIG. 3 to the −x direction side along the arrow, the pipe 300 is inserted through each of the through holes 521 and 522. FIG. 4 shows a state in which such a first placement process is completed.

  In the second arrangement step subsequent to the first arrangement step, the switching element 420 is arranged and fixed in the recess 510 of the plate 500. Fixing of the switching element 420 is performed by inserting a bolt 422 toward the −x direction side and fastening the bolt 422 from the x direction side. FIG. 5 shows a state in which such a second placement process is completed.

  Thereafter, the lid 600 is attached to the plate 500 and fastened and fixed by the bolt 602 shown in FIG. FIG. 6 shows a state in which such attachment of the lid 600 is completed.

  In addition, arrangement | positioning of the heater 410 with respect to the clearance gap between the tubes 200 can be performed at arbitrary timing among each above process. Therefore, in the above description, the arrangement of the heater 410 is not mentioned.

  After the heater 410 is disposed between the tubes 200, the assembly shown in FIG. 6 is inserted into the case 100 from the opening 101 and compressed along the stacking direction. At this time, a portion of each of the tubes 200 to which the pipe 300 is connected is particularly deformed. Therefore, assuming that the distance from the end surface 501 of the plate 500 to the -x direction side end surface of the tube 200 arranged closest to the -x direction is L, L in the state of FIG. , L in the state of FIG.

  According to the manufacturing method as described above, the fluid heating module 10 having the configuration in which the switching element 420 is disposed inside the recess 510 can be easily manufactured.

  In the present embodiment, the switching element 420, which is the second heating element, is disposed at a position further outward (x direction side) than the end tube 210 closest to the x direction. Instead of such an aspect, the switching element 420 may be disposed at a position opposite to the above. Such a modification will be described with reference to FIG.

  As shown in FIG. 7, the pressing unit 700 includes an elastic member 710, a first plate 720, and a second plate 730. The elastic member 710 is for applying a compressive force to the tube 200 and the heater 410, and is formed of, for example, a leaf spring. The first plate 720 is a flat plate disposed between the elastic member 710 and the wall 120. The second plate 730 is a flat plate disposed between the elastic member 710 and the tube 200 closest to the −x direction.

  The tube 200 with which the second plate 730 is in contact is disposed at the endmost position along the stacking direction (the -x direction in this modification). The said tube 200 corresponds to the "end part tube 210" in this modification.

  The switching element 420 in this modification is disposed at a position further outside (−x direction side) than the end tube 210 in the stacking direction. An example of a specific arrangement position is shown by dotted line 722 and dotted line 732 in FIG.

  The dotted line 722 shows an example of the position between the pressing unit 700 and the wall 120. When arranging the switching element 420 at such a position, for example, after forming a recess on the surface 721 on the −x direction side of the first plate 720, arranging the switching element 420 inside the recess Good.

  Shown by dotted line 732 is an example of the position between the pressurizing unit 700 and the end tube 210. In the case where the switching element 420 is disposed at such a position, for example, a recess may be formed on the surface 731 on the x direction side of the second plate 730, and then the switching element 420 may be disposed inside the recess. .

  As described above, even in the case where the switching element 420 which is the second heating element is disposed at a position not on the x direction side but on the −x direction side, the same effect as that described in the above embodiment can be obtained. In the configuration in which the second heating element is disposed at the location indicated by the dotted line 722 in FIG. 7, the utilization efficiency of the heat from the second heating element is lowered. However, such arrangement may be employed when the calorific value of the second heating element is small.

  The present embodiment has been described above with reference to the specific example. However, the present disclosure is not limited to these specific examples. Those appropriately modified in design by those skilled in the art are also included in the scope of the present disclosure as long as the features of the present disclosure are included. The elements included in the above-described specific examples, and the arrangement, conditions, and shapes thereof are not limited to those illustrated, but can be appropriately modified. The elements included in the above-described specific examples can be appropriately changed in combination as long as no technical contradiction arises.

10: fluid heating module 200: tube 210: end tube 410: heater 420: switching element

Claims (8)

A fluid heating module (10) for heating a fluid, wherein
A first heating element (410),
A second heating element (420) which generates a smaller amount of heat than the first heating element;
And a plurality of tubes (200) arranged so as to flow fluid therein, and arranged alternately with the first heating element along the stacking direction.
When one of the plurality of tubes disposed at the endmost position along the stacking direction is used as an end tube (210),
The fluid heating module, wherein the second heating element is disposed at a position outside the end tube along the stacking direction.   The fluid heating module according to claim 1, wherein a plate (500) is arranged between the second heating element and the end tube. A recess (510) is formed on the surface of the plate on the side opposite to the end tube so as to retract toward the end tube side,
The fluid heating module according to claim 2, wherein the second heating element is disposed inside the recess.   The fluid heating module according to claim 3, wherein the second heating element is fixed to the plate in a state of being in contact with the bottom surface (511) of the recess.   The fluid heating module according to any one of claims 2 to 4, wherein the heat release surface (421) of the second heat generating body is in contact with the plate.   The fluid heating module according to any one of claims 1 to 5, wherein the temperature of the second heating element is higher than the temperature of the first heating element when the fluid is being heated. The first heating element is a heater that receives power and generates heat,
The fluid heating module according to any one of claims 1 to 6, wherein the second heating element is a switching element for adjusting the magnitude of the power supplied to the first heating element. A method of manufacturing a fluid heating module according to any one of claims 1 to 7, wherein
Preparing the plurality of tubes, the second heating element, and the plate in which the recess is formed;
A first disposing step of disposing the plate at a position on the outer side of the end tube along the stacking direction after arranging the plurality of tubes in the stacking direction;
And a second disposing step of disposing the second heat generating body in the concave portion.

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