JP2022083870A - Pipe junction structure, heat exchanger, and manufacturing method of heat exchanger - Google Patents

Abstract

To provide a pipe junction structure which is improved in sealability even without brazing a first pipe body and a second pipe body.SOLUTION: A pipe body junction structure comprises a metallic first pipe body, a second pipe body and a resin fixing part. The first pipe body includes a first main body part including a first internal passage therein, and a first connection pipe part including a first opening communicating with the first internal passage on a front end face. The second pipe body includes a second main body part including a second internal passage therein, and a second connection pipe part including a second opening communicating to the second internal passage on a front end face. The second connection pipe part at the side of the front end face is at least partially fitted through the first opening into the first connection pipe part. The resin fixing part is an insert mold of a resin composition, is in contact with at least a portion of an outer peripheral surface of each of the first connection pipe part and the second connection pipe part and fixes the second connection pipe part to the first connection pipe part while covering a whole circumference of an outer peripheral edge of the top end face of the first connection pipe part.SELECTED DRAWING: Figure 8

Description

The present invention relates to a tubular joint structure, a heat exchanger, and a method for manufacturing the heat exchanger.

A central processing unit (CPU: Central Processing Unit) mounted on a computer or a secondary battery mounted on an electric vehicle generates heat during operation. Various heat exchangers using a cooling medium have been proposed as means for cooling such a heating element.

Patent Document 1 discloses a heat exchanger for adjusting the temperature of a lithium ion battery mounted on a vehicle. The heat exchanger disclosed in Patent Document 1 includes a perforated tube, a distribution tank, and a collecting tank. The perforated tube has a plurality of through holes through which cooling water flows. The distribution tank distributes the cooling water to each of the plurality of through holes of the perforated pipe. The collecting tank collects the cooling water that has passed through a plurality of through holes of the perforated pipe. The perforated pipe and each of the distribution tank and the collecting tank are joined by brazing.

Japanese Unexamined Patent Publication No. 2016-38120

In response to the diversification of applications of heat exchangers in recent years, it is desired to cope with the complicated shape, weight reduction and cost reduction of heat exchangers. In particular, in a heat exchanger using a cooling medium, there is a demand for a technique for joining a first tube body to a second tube body by a method other than welding or brazing while ensuring airtightness. The first tube body includes a perforated tube. The second tube includes a distribution tank and a collection tank.

In view of the above circumstances, the present invention provides a pipe body joint structure having excellent airtightness, a heat exchanger, and a method for manufacturing a heat exchanger even if the first pipe body and the second pipe body are not brazed. The task is to do.

The means for solving the above problems include the following embodiments.

<1> The tube joining structure of the first aspect of the present disclosure is
A first metal pipe having a first main body portion including a first internal flow path through which a fluid flows, and a first connecting pipe portion including a first opening communicating with the first internal flow path on the tip surface. With the body
A second main body including a second internal flow path through which the fluid flows, and a second opening that communicates with the second internal flow path on the tip surface, and the tip surface side via the first opening. A second pipe body having at least a part of the second connecting pipe portion fitted inside the first connecting pipe portion, and a second pipe body.
It is an insert molded product of the resin composition, and is in contact with at least a part of the outer peripheral surface of each of the first connecting pipe portion and the second connecting pipe portion, and is on the outer peripheral edge of the tip surface of the first connecting pipe portion. It is a pipe body joining structure including a resin fixing portion for fixing the second connecting pipe portion to the first connecting pipe portion so as to cover the entire circumference.

The outer peripheral edge of the tip surface of the first connecting pipe portion is easily deformed when a pressing force is applied. In the first aspect, when the resin fixing portion is insert-molded, the portion where the resin fixing portion of the first connecting pipe portion is formed is directed toward the inside of the first pipe body in the radial direction of the first connecting pipe portion. Pressing pressure is applied. At this time, the portion fitted inside the first connecting pipe portion of the second connecting pipe portion functions as a support for the outer peripheral edge of the tip surface of the first connecting pipe portion. Therefore, the outer peripheral edge of the tip surface of the first connecting pipe portion is not easily deformed. As a result, the tube body joining structure is excellent in airtightness even if the first tube body and the second tube body are not brazed.

<2> The tube joining structure of the second aspect of the present disclosure is
The second connecting pipe portion includes a fitting portion fitted inside the first connecting pipe portion.
In a cross section including the fitting portion cut along a plane orthogonal to the longitudinal direction of the first connecting pipe portion, the ratio of the total area of the fitting portion to the total area of the inner empty area of the first connecting pipe portion is , 30 area% or more and 80 area% or less, according to <1>.

In the second aspect, when the resin fixing portion is insert-molded, the fitting portion of the second pipe portion functions more strongly as a support for the portion where the resin fixing portion of the first connecting pipe portion is formed. Therefore, the portion where the resin fixing portion of the first connecting pipe portion is formed is less likely to be deformed.

<3> The tube joining structure of the third aspect of the present disclosure is
The second connecting pipe portion includes a fitting portion fitted inside the first connecting pipe portion and a non-fitting portion not fitted inside the first connecting pipe portion.
In the longitudinal direction of the first connecting pipe portion, the outer peripheral edge of the resin fixing portion on the side opposite to the non-fitting portion is closer to the non-fitting portion side than the outer peripheral edge of the tip surface of the fitting portion. The tubular joint structure according to <1> or <2>, which is located.

In the third aspect, the fitting portion of the second pipe body is present inside the portion of the first connecting pipe portion that comes into contact with the resin fixing portion. As a result, when the resin fixing portion is insert-molded, the fitting portion of the second connecting pipe portion functions as a support for the portion where the resin fixing portion of the first connecting pipe portion is formed. As a result, the portion of the first connecting pipe portion that comes into contact with the resin fixing portion is not easily deformed. Therefore, the tube body joining structure is more excellent in airtightness even if the first tube body and the second tube body are not brazed.

<4> The tube joining structure of the fourth aspect of the present disclosure is
The second connecting pipe portion
A fitting portion fitted inside the first connecting pipe portion and a non-fitting portion not fitted inside the first connecting pipe portion are included.
The pipe joining structure according to any one of <1> to <3>, wherein the wall thickness of the non-fitting portion is thicker than the wall thickness of the fitting portion.

In the fourth aspect, the bending strength of the non-fitting portion of the second tube is stronger than that of the fitting portion of the second tube. Therefore, when the resin fixing portion is insert-molded, even if a pressing force is applied to the portion where the resin fixing portion of the non-fitting portion of the second tube is formed, the non-fitting portion of the second tube is more. Hard to deform.

<5> The tube joining structure of the fifth aspect of the present disclosure is
The pipe joining structure according to any one of <1> to <4>, wherein the outer peripheral surface of the first connecting pipe portion in contact with the resin fixing portion has a roughened surface.

In the fifth aspect, the resin fixing portion is firmly fixed to the second pipe portion. As a result, the tubular joint structure can maintain its tightness for a long period of time.

<6> The tube joining structure of the sixth aspect of the present disclosure is
The second connecting pipe portion includes a non-fitting portion that is not fitted inside the first connecting pipe portion.
The second connecting pipe portion is made of resin and is made of resin.
The pipe joining structure according to any one of <1> to <5>, wherein the non-fitting portion and the resin fixing portion are fused.

In the sixth aspect, the resin fixing portion is strongly fixed to the non-fitting portion of the second tube body. As a result, the tubular joint structure can maintain its tightness for a long period of time.

<7> The heat exchanger of the seventh aspect of the present disclosure includes the tube body joining structure according to any one of <1> to <6>.
A heat exchanger in which the fluid is a heat exchange medium that exchanges heat with a heat exchanger.

In the seventh aspect, the heat exchanger is excellent in airtightness even if the first tube body and the second tube body are not brazed.

<8> The heat exchanger of the eighth aspect of the present disclosure is
The first tube contains at least one heat transfer tube and contains at least one heat transfer tube.
Each of the at least one heat transfer tube has a tubular first main body portion that transfers heat of the heat exchange medium to the heat exchanger, and a pair of the first connection tube portions.
The second tubular body includes a first manifold and a second manifold.
The first manifold is inside one of the second main body portion including the second internal flow path that supplies the heat exchange medium to the first internal flow path and the pair of first connection pipe portions. It has the second connecting pipe portion that is fitted, and has
The second manifold contains the second internal flow path inside which collects the heat exchange medium discharged from the first internal flow path, and the other of the pair of first connection pipe portions. The heat exchanger according to <7>, which has the second connecting pipe portion fitted inside the above.

In the conventional heat exchanger, the heat transfer tube and the manifold are fixed by brazing. Therefore, when the conventional heat exchanger is installed in an environment that is susceptible to external vibration, the stress caused by the external vibration acts locally on the brazed portion that is the joint surface between the heat transfer tube and the manifold. It's easy to do. As a result, the brazed portion may be easily damaged. Further, in the conventional heat exchanger, for example, when it is used in an environment where dew condensation is likely to occur, the brazed portion may be easily corroded.
In the eighth aspect, the resin fixing portion is formed on the outer peripheral surface of the first connection end portion of the heat transfer tube and the outer peripheral surface of the first manifold or the second manifold inserted into the heat transfer tube. The resin fixing portion covers the entire circumference of the outer peripheral edge of the tip surface of the heat transfer tube into which the first manifold or the second manifold is inserted. Therefore, even if the heat exchanger is installed in an environment that is susceptible to external vibration, the stress caused by the external vibration is unlikely to act locally as in the conventional heat exchanger. Further, in the eighth aspect, even if the heat exchanger is used in an environment where dew condensation is likely to occur, the resin fixing portion is not easily corroded. As a result, the heat exchanger can maintain excellent airtightness for a long period of time.

<9> The heat exchanger of the ninth aspect of the present disclosure is
The first manifold is connected to a supply component connecting pipe portion connected to a supply component that supplies the heat exchange medium to the second internal flow path, and to the supply component connecting pipe portion and the supply component connecting pipe portion. It has a first packing for sealing the gap with the supply component, and has.
The second manifold is connected to a recovery component connection pipe section connected to a recovery component that recovers the heat exchange medium discharged from the second internal flow path, and to the recovery component connection tube section and the recovery component connection tube section. The heat exchanger according to <8>, which has a second packing for sealing a gap with the connected recovery component.

In the ninth aspect, the heat exchanger packs the heat exchange medium for leakage or foreign matter from the outside through the gap between the supply component connecting pipe and the recovery component and the gap between the recovery component connection pipe and the recovery component. It can be prevented more reliably than when it is not provided.

<10> The heat exchanger of the tenth aspect of the present disclosure is
Each of the first manifold and the second manifold is made of resin.
The first manifold has a first protruding fixing portion that protrudes from the outer peripheral surface of the second main body portion and for fixing a supply component that supplies the heat exchange medium to the second internal flow path.
The second manifold has a second protruding fixing portion for fixing a recovery component that projects from the outer peripheral surface of the second main body portion and collects the heat exchange medium discharged from the second internal flow path. The heat exchanger according to <8> or <9>.

In the tenth aspect, the heat exchanger can suppress the occurrence of the supply component falling off from the first manifold and the recovery component from falling out of the second manifold.
Further, in the tenth aspect, each of the first manifold and the second manifold is an integrally resin molded product. Therefore, each of the first protruding fixing portion and the second protruding fixing portion is not separately attached to the outer peripheral surface of the second main body portion by brazing or welding. As a result, the heat exchanger is superior in manufacturing cost as compared with the case where at least one of the first manifold and the second manifold is made of metal.

<11> The heat exchanger of the eleventh aspect of the present disclosure is
The first tube body includes a plurality of heat transfer tubes, and the first tube body contains a plurality of heat transfer tubes.
The first manifold comprises a plurality of first manifold dividers that can be connected to each other.
Each of the plurality of first manifold divided bodies is a first connection for connecting at least one said second connecting pipe portion and the other said first manifold divided body included in the plurality of first manifold divided bodies. Has a tube and
The second manifold comprises a plurality of second manifold dividers that can be connected to each other.
The second connecting pipe portion in which each of the plurality of second manifold divided bodies is paired with the second connecting pipe portion of the first manifold divided body, and the other included in the plurality of second manifold divided bodies. The heat exchanger according to any one of <8> to <10>, which has a second connecting pipe portion for connecting to the second manifold split body.

In the eleventh aspect, the heat exchanger is excellent in manufacturing cost even if it is large.

<12> The method for manufacturing the heat exchanger according to the twelfth aspect of the present disclosure includes a first preparation step of preparing a metal heat transfer tube having a pair of first connection tube portions, and the pair of first connection tube portions. A second preparation step of preparing a first manifold having a second connecting pipe portion to which one is fitted, and a second manifold having a second connecting pipe portion to which the other of the pair of first connecting pipe portions is fitted. A third preparation step of preparing the above, a first fitting step of fitting one of the pair of first connection pipe portions to the second connection pipe portion of the first manifold, and the pair of first connection pipe portions. After the second fitting step of fitting the other to the second connecting pipe portion of the second manifold and the first fitting step are executed, one of the tip surfaces of the pair of first connecting pipe portions. A resin fixing portion is insert-molded on at least a part of one of the pair of first connecting pipe portions and the outer peripheral surface of each of the second connecting pipe portions of the first manifold so as to cover the entire circumference of the outer peripheral edge of the above. After the first insert forming step and the second fitting step are executed, the pair of first connecting pipe portions covers the entire outer peripheral edge of the other end surface of the pair of first connecting pipe portions. (1) A heat exchanger having a second insert molding step of forming a resin fixing portion by insert molding on at least a part of the outer peripheral surface of each of the other of the connecting pipe portions and the second connecting pipe portion of the second manifold. It is a manufacturing method.

In the twelfth aspect, it is possible to manufacture a heat exchanger capable of maintaining excellent airtightness for a long period of time.

<13> The heat exchanger of the thirteenth aspect of the present disclosure is
The first manifold has a plurality of first manifold divided bodies that can be connected to each other.
Each of the plurality of first manifold divided bodies is a first connection for connecting at least one said second connecting pipe portion and the other said first manifold divided body included in the plurality of first manifold divided bodies. Has a tube and
The second manifold has a plurality of second manifold dividers that can be connected to each other.
The second connecting pipe portion in which each of the plurality of second manifold divided bodies is paired with the second connecting pipe portion of the first manifold divided body, and the other included in the plurality of second manifold divided bodies. It has a second connecting pipe portion for connecting to the second manifold split body, and has.
The second preparatory step includes a first connecting step of connecting the first connecting pipe portions of each of the plurality of first manifold divided bodies.
The method for manufacturing a heat exchanger according to <12>, wherein the third preparation step includes a second connecting step of connecting the second connecting pipe portions of each of the plurality of second manifold divided bodies.

In the thirteenth aspect, a heat exchanger capable of maintaining excellent airtightness for a long period of time can be manufactured at low cost even if it is large in size.

According to the present invention, there is provided a tube body joining structure having excellent airtightness, a heat exchanger, and a method for manufacturing a heat exchanger even if the first tube body and the second tube body are not brazed.

It is a perspective view which shows the appearance of the heat exchanger which concerns on 1st Embodiment. The appearance of the joint structure of the heat transfer tube, the supply manifold, and the resin fixing portion on the side side according to the first embodiment is shown. It is a perspective view which shows the appearance of the heat transfer tube which concerns on 1st Embodiment. It is a perspective view which shows the appearance of the supply manifold which concerns on 1st Embodiment. It is a perspective view which shows the appearance of the branch pipe part of the supply manifold which concerns on 1st Embodiment. FIG. 2 is a sectional view taken along line VI-VI shown in FIG. FIG. 2 is a sectional view taken along line VII-VII shown in FIG. It is a perspective view which shows the appearance of the outlet end portion of the supply manifold which concerns on 1st Embodiment. It is a perspective view which shows the appearance of the receiving end portion of the supply manifold which concerns on 1st Embodiment. It is a perspective view which shows the appearance of the heat exchanger which concerns on 1st Embodiment. It is sectional drawing of the insert which concerns on the 1st Embodiment in the state which performed the mold clamping of an injection molding die. It is a perspective view which shows the appearance of the heat exchanger which concerns on 2nd Embodiment. It is a perspective view which shows the appearance of the branch pipe part of the supply manifold which concerns on 3rd Embodiment. It is a perspective view which shows the appearance of the heat transfer tube which concerns on 4th Embodiment. It is a perspective view which shows the appearance of the branch pipe part of the supply manifold which concerns on 4th Embodiment. It is a perspective view which shows the appearance of the branch pipe part of the supply manifold which concerns on 5th Embodiment. It is sectional drawing of the pipe joint structure which concerns on 6th Embodiment.

Hereinafter, embodiments of a tube joining structure, a heat exchanger, and a method for manufacturing the heat exchanger according to the present disclosure will be described with reference to the drawings. Further, in the figure, the same or corresponding parts are designated by the same reference numerals and the description is not repeated.

(1) First Embodiment The heat exchanger 100 according to the first embodiment of the present disclosure will be described with reference to FIGS. 1 to 11. FIG. 1 is a perspective view showing the appearance of the heat exchanger 100 according to the first embodiment. FIG. 2 shows the appearance of the joint structure of the heat transfer tube 1, the supply manifold 2A, and the supply-side resin fixing portion 3A according to the first embodiment.

In the first embodiment, the heat exchanger 100 is used to promote heat dissipation from an external heating element. The heating element generates heat during operation. Examples of the heating element include a CPU, a memory module, a secondary battery, a power module, a battery module, and the like. Examples of the memory module include DIMM (Dual Inline Memory Module) and the like. Examples of the secondary battery include an in-vehicle lithium ion battery and the like. The heating element is an example of a heat exchanger.

As shown in FIG. 1, the heat exchanger 100 is a flat plate. The heat exchanger 100 has an upper main surface TS100. The upper main surface TS100 is planar.
The heat exchanger 100 is arranged, for example, on the upper main surface TS100 so that the heating element is in physical contact with the heat exchanger 100. In other words, the heat exchanger 100 is arranged at the bottom of the heating element. The heat exchanger 100 may be arranged not only at the lower part of the heating element but also at the upper part of the heating element. Further, using two heat exchangers 100, one heat exchanger 100 may be arranged below the heating element and the other heat exchanger 100 may be arranged above the heating element. By arranging the heat exchanger 100 in each of the upper part and the lower part of the heating element, the heating element can be cooled from each of the upper part and the lower part of the heating element. As a result, the cooling efficiency of the heating element is further improved.

The heat exchanger 100 includes a plurality of heat transfer tubes 1, a supply manifold 2A, a recovery manifold 2B, a plurality of supply-side resin fixing portions 3A, and a plurality of recovery-side resin fixing portions 3B. The supply manifold 2A and the recovery manifold 2B are paired.
The plurality of heat transfer tubes 1 are an example of the first tube body. The supply manifold 2A and the recovery manifold 2B are examples of the second tubular body. Specifically, the supply manifold 2A is an example of the first manifold. The recovery manifold 2B is an example of the second manifold. The plurality of supply-side resin fixing portions 3A and the plurality of recovery-side resin fixing portions 3B are examples of the resin fixing portions.

In the first embodiment, the longitudinal direction of the heat transfer tube 1 will be described as “horizontal direction”, the longitudinal direction of the supply manifold 2A will be described as “front-back direction”, and the directions orthogonal to the left-right direction and the front-rear direction will be described as “vertical direction”. Further, in the left-right direction, the supply manifold 2A side with respect to the heat transfer tube 1 is defined as the “right side”, and the recovery manifold 2B side with respect to the heat transfer tube 1 is defined as the “left side”. It should be noted that these orientations do not limit the orientation when the heat exchanger of the present disclosure is used.

Each of the plurality of heat transfer tubes 1 is connected to each of the supply manifold 2A and the recovery manifold 2B. In the left-right direction, the plurality of heat transfer tubes 1 are located between the supply manifold 2A and the recovery manifold 2B. The supply-side resin fixing portion 3A fixes the supply manifold 2A to the heat transfer tube 1. The recovery-side resin fixing portion 3B fixes the recovery manifold 2B to the heat transfer tube 1.
Specifically, as shown in FIG. 2, the heat transfer tube 1 has a right end surface RS1. The right end surface RS1 of the heat transfer tube 1 is connected to the supply manifold 2A. The supply-side resin fixing portion 3A is formed on the outer peripheral surface CS1 of the heat transfer tube 1 and the outer peripheral surface CS2A of the supply manifold 2A so as to cover the entire circumference of the outer peripheral edge RE1 of the right end surface RS1 of the heat transfer tube 1. The same applies to the joint structure of the heat transfer tube 1, the recovery manifold 2B, and the recovery side resin fixing portion 3B. The plurality of heat transfer tubes 1, the supply manifold 2A, the recovery manifold 2B, the plurality of supply-side resin fixing portions 3A, and the plurality of recovery-side resin fixing portions 3B are integrated. The right tip surface RS1 is an example of the tip surface of the first connecting pipe portion.

The supply manifold 2A guides the cooling medium supplied from the external supply component to each of the plurality of heat transfer tubes 1. The supply component supplies the cooling medium to the heat exchanger 100. A cooling medium circulates inside each of the plurality of heat transfer tubes 1. The plurality of heat transfer tubes 1 physically contact the heating element and exchange heat with the heating element. The recovery manifold 2B collects the cooling media supplied from each of the plurality of heat transfer tubes and guides them to an external recovery component. As the recovery component, the cooling medium is recovered from the heat exchanger 100.

Examples of the cooling medium include a cooling liquid and a cooling gas. Examples of the cooling liquid include water and oil. Examples of the cooling gas include air and nitrogen gas. The temperature of the cooling medium is appropriately adjusted according to the type of heating element and the like. The cooling medium is an example of a fluid. Specifically, the cooling medium is an example of a heat exchange medium.

The dimensions of the heat exchanger 100 are not particularly limited, and are appropriately adjusted according to the type of heating element (lithium ion battery, battery module, power module, etc.) and the like.
When the heating element is arranged on the upper main surface TS100, the length L1 (see FIG. 1) in the left-right direction of the heat exchanger 100 is preferably 10 cm or more and 300 cm or less, and the length in the front-rear direction of the heat exchanger 100. L2 (see FIG. 1) is preferably 10 cm or more and 300 cm or less.

(1.2) Heat Transfer Tube Next, the heat transfer tube 1 according to the first embodiment of the present disclosure will be described with reference to FIGS. 1 to 3. FIG. 3 is a perspective view showing the appearance of the heat transfer tube 1 according to the first embodiment.

The heat transfer tube 1 is an extruded metal product. As shown in FIG. 3, the heat transfer tube 1 is a flat porous tube. The heat transfer tube 1 has an upper main surface TS1. The upper main surface TS1 of the plurality of heat transfer tubes 1 constitutes the upper main surface TS100 of the heat exchanger 1.

In the first embodiment, the heat transfer tube 1 has a tube main body portion 11, a supply side connection tube portion 12, a recovery side connection tube portion 13, and two partition walls 14. The tube main body 11 is an example of the first main body of the heat transfer tube. The supply side connection pipe portion 12 and the recovery side connection pipe portion 13 are examples of a pair of first connection pipe portions of the heat transfer tube.

The pipe body 11 extends from the supply-side connecting pipe portion 12 to the recovery-side connecting pipe portion 13 along the left direction. The longitudinal direction of the tube main body 11 indicates the longitudinal direction of the heat transfer tube 1. The supply side connecting pipe portion 12 constitutes the right end portion of the pipe main body portion 11. The collection side connecting pipe portion 13 constitutes the left end portion of the pipe main body portion 11. The two partition walls 14 are located inside the pipe main body portion 11, the supply side connection pipe portion 12, and the recovery side connection pipe portion 13. Each of the two partition walls 14 extends from the supply side connection pipe portion 12 to the recovery side connection pipe portion 13 along the left direction. The two partition walls 14 are separated from each other at a predetermined distance in the front-rear direction. The pipe main body portion 11, the supply side connection pipe portion 12, the recovery side connection pipe portion 13, and the two partition walls 14 are integral parts.

The tube body 11 transfers heat from the heating element to the cooling medium. The tube body 11 is a tubular object.
The pipe body 11 has a rear flow path R11A, a central flow path R11B, and a front flow path R11C inside. Each of the rear flow path R11A, the central flow path R11B, and the front side flow path R11C is independent by the partition wall 14. A cooling medium flows through each of the rear flow path R11A, the central flow path R11B, and the front side flow path R11C. The rear flow path R11A, the central flow path R11B, and the front flow path R11C are examples of the first internal flow path.

Hereinafter, when each of the rear flow path R11A, the central flow path R11B, and the front flow path R11C is not distinguished, the rear flow path R11A, the central flow path R11B, and the front flow path R11C are collectively referred to as "internal flow path R11". May be described as.

The supply side connection pipe portion 12 is a portion for connecting to the supply manifold 2A. The supply side connecting pipe portion 12 has a rear opening H1A, a central opening H1B, and a front opening H1C. The rear opening H1A, the central opening H1B, and the front opening H1C are formed on the right front surface RS1 in this order toward the front. The rear opening H1A, the central opening H1B, and the front opening H1C are examples of the first opening.

The recovery side connection pipe portion 13 is a portion for connecting to the recovery manifold 2B. The recovery side connecting pipe portion 13 has a rear opening H1A, a central opening H1B, and a front opening H1C. The rear opening H1A, the central opening H1B, and the front opening H1C are formed on the left front end surface LS1 in this order toward the front.

The rear opening H1A of the supply side connecting pipe portion 12 and the rear opening H1A of the collecting side connecting pipe portion 13 communicate with each other via the rear flow path R11A. The central opening H1B of the supply side connecting pipe portion 12 and the central opening H1B of the collecting side connecting pipe portion 13 communicate with each other via the central flow path R11B. The front opening H1C of the supply side connection pipe portion 12 and the front opening H1C of the recovery side connection pipe portion 13 communicate with each other via the front flow path R11C.

Hereinafter, when each of the rear opening H1A, the central opening H1B, and the front opening H1C is not distinguished, the rear opening H1A, the central opening H1B, and the front opening H1C may be collectively referred to as "opening H1". ..

The material of the heat transfer tube 1 is metal, and can be selected according to the application of the heat exchanger 100 and the like. The material of the heat transfer tube 1 is selected from the group consisting of, for example, iron, copper, nickel, gold, silver, platinum, cobalt, zinc, lead, tin, titanium, chromium, aluminum, magnesium, manganese, and alloys thereof. It may be at least one kind. Examples of the alloy include stainless steel, brass, phosphor bronze and the like. Among them, from the viewpoint of thermal conductivity, the material of the heat transfer tube 1 is preferably at least one selected from aluminum, an aluminum alloy, copper, and a copper alloy, and copper or a copper alloy is more preferable. From the viewpoint of weight reduction and ensuring strength, aluminum or an aluminum alloy is more preferable as the material of the heat transfer tube 1.

When the heating element is arranged on the upper main surface TS100, the length L3 (see FIG. 3) in the left-right direction of the heat transfer tube 1 is preferably 2 cm or more and 60 cm or less.

(1.3) Supply Manifold Next, the supply manifold 2A according to the first embodiment of the present disclosure will be described with reference to FIGS. 1, 2, and 4 to 9. FIG. 4 is a perspective view showing the appearance of the supply manifold 2A according to the first embodiment. FIG. 5 is a perspective view showing the appearance of the branch pipe portion 22 of the supply manifold 2A according to the first embodiment. FIG. 6 is a sectional view taken along line VI-VI shown in FIG. FIG. 7 is a sectional view taken along line VII-VII shown in FIG. FIG. 8 is a perspective view showing the appearance of the outlet end portion 23 of the supply manifold 2A according to the first embodiment. FIG. 9 is a perspective view showing the appearance of the receiving end portion 24 of the supply manifold 2A according to the first embodiment.

The supply manifold 2A is an integrally resin molded product. As shown in FIG. 4, the supply manifold 2A is a header that distributes the cooling medium to each of the plurality of heat transfer tubes 1.

As shown in FIG. 4, the supply manifold 2A has a main pipe portion 21, a plurality of branch pipe portions 22, a spigot end portion 23, and a receiving port end portion 24. The main pipe portion 21 is an example of the second main body portion of the first manifold. The branch pipe portion 22 is an example of the second connecting pipe portion of the first manifold.

The main pipe portion 21 extends from the outlet end portion 23 to the receiving end portion 24 along the rear direction. The longitudinal direction of the main pipe portion 21 indicates the longitudinal direction of the supply manifold 2A. The longitudinal direction of the heat transfer tube 1 and the longitudinal direction of the supply manifold 2A are orthogonal to each other. The outlet end portion 23 constitutes the front end portion of the main pipe portion 21. The receiving end portion 24 constitutes the rear end portion of the main pipe portion 21. Each of the plurality of branch pipe portions 22 projects to the left from the outer peripheral surface CS21 of the main pipe portion 21. Each of the plurality of branch pipe portions 22 is arranged in a row along the front-rear direction. The main pipe portion 21, the plurality of branch pipe portions 22, the spigot end portion 23, and the receiving port end portion 24 are integral parts.

(13.1) Main pipe portion The main pipe portion 21 has an internal flow path R21 inside. A cooling medium flows through the internal flow path R21. The internal flow path R21 supplies a cooling medium to the internal flow path R11 (see FIG. 3) of the heat transfer tube 1. The internal flow path R21 is an example of the second internal flow path.

(1.3.2) Branch pipe portion As shown in FIG. 5, the branch pipe portion 22 has a fitting portion 22F and a non-fitting portion 22N. The fitting portion 22F indicates a portion of the branch pipe portion 22 that is fitted inside the heat transfer tube 1 in the heat exchanger 100. The non-fitting portion 22N indicates a portion of the branch pipe portion 22 that is not fitted inside the heat transfer tube 1 in the heat exchanger 100. The fitting portion 22F is located on the left side of the branch pipe portion 22 in the left-right direction. The non-fitting portion 22N is located on the right side of the branch pipe portion 22 in the left-right direction. The fitted portion 22F and the non-fitted portion 22N are integral parts.

The fitting portion 22F has a rear side overhanging portion 22F1, a central overhanging portion 22F2, and a front side overhanging portion 22F3. The rear overhanging portion 22F1, the central overhanging portion 22F2, and the front side overhanging portion 22F3 are arranged in this order toward the front direction. Each of the rear overhanging portion 22F1, the central overhanging portion 22F2, and the front side overhanging portion 22F3 projects toward the left from the left surface LS22N2 of the non-fitting portion 22N.

As shown in FIG. 6, the rear overhanging portion 22F1 is fitted inside the heat transfer tube 1 via the rear opening H1A (see FIG. 3) of the heat transfer tube 1 in the heat exchanger 100. The supply side connecting pipe portion 12 has a rear inner peripheral surface IS12A (see FIG. 6) on the rear side in the front-rear direction. The rear inner peripheral surface IS12A of the supply side connection pipe portion 12 constitutes a part of the rear flow path R11A. As shown in FIG. 6, the outer peripheral surface CS22F1 of the rear overhanging portion 22F1 is in contact with the rear inner peripheral surface IS12A of the supply side connecting pipe portion 12.
The central overhanging portion 22F2 is fitted inside the heat transfer tube 1 via the central opening H1B (see FIG. 3) of the heat transfer tube 1 in the heat exchanger 100. The supply-side connecting pipe portion 12 has a central inner peripheral surface IS12B (see FIG. 6) at the center in the front-rear direction. The central inner peripheral surface IS12B of the supply-side connecting pipe portion 12 constitutes a part of the central flow path R11B. As shown in FIG. 6, the outer peripheral surface CS22F2 of the central overhanging portion 22F2 is in contact with the central inner peripheral surface IS12B of the supply side connecting pipe portion 12.
The front overhanging portion 22F3 is fitted inside the heat transfer tube 1 via the front opening H1C (see FIG. 3) of the heat transfer tube 1 in the heat exchanger 100. The supply-side connecting pipe portion 12 has a front-side inner peripheral surface IS12C (see FIG. 6) on the front side in the front-rear direction. The front inner peripheral surface IS12C of the supply side connecting pipe portion 12 constitutes a part of the front flow path R11C. The front inner peripheral surface IS12C of the supply side connecting pipe portion 12 constitutes a part of the front flow path R11C. As shown in FIG. 6, the outer peripheral surface CS22F3 of the front overhanging portion 22F3 is in contact with the front inner peripheral surface IS12C of the supply side connecting pipe portion 12.

Hereinafter, when the outer peripheral surface CS22F1 of the rear overhanging portion 22F1, the outer peripheral surface CS22F2 of the central overhanging portion 22F2, and the outer peripheral surface CS22F3 of the front overhanging portion 22F3 are not distinguished, the outer peripheral surface CS22F1 and the outer peripheral surface CS22F2, And the outer peripheral surface CS22F3 is described as "outer peripheral surface CS22F". If the rear inner peripheral surface IS12A of the supply side connecting pipe portion 12, the central inner peripheral surface IS12B of the supply side connecting pipe portion 12, and the front inner peripheral surface IS12C of the supply side connecting pipe portion 12 are not distinguished, the rear inner peripheral surface is not distinguished. The surface IS12A, the central inner peripheral surface IS12B, and the front inner peripheral surface IS12C are referred to as "inner peripheral surface IS12".

In the heat exchanger 100, the upper limit of the strut area ratio is preferably 80 area% or less, more preferably 70 area% or less, still more preferably 65 area% or less. The lower limit of the strut area ratio is preferably 30 area% or more, more preferably 40 area% or more, and further preferably 45 area% or more. The strut area ratio indicates the ratio of the total area of the fitting portion 22F to the total area of the inner space of the heat transfer tube 1 in the cross section including the fitting portion 22F cut in a plane orthogonal to the left-right direction. Specifically, in FIG. 6, the inner empty area of the heat transfer tube 1 is surrounded by the area surrounded by the rear inner peripheral surface IS12A, the area surrounded by the central inner peripheral surface IS12B, and the front inner peripheral surface IS12C. Shows the sum with the area. The total area of the fitting portion 22F shows the sum of the area of the rear overhanging portion 22F1, the area of the central overhanging portion 22F2, and the area of the front overhanging portion 22F3 in FIG.

The central overhang 22F2 has two openings H2A, as shown in FIG. The two openings H2A are formed along the front-rear direction on the left end surface LS22 of the central overhanging portion 22F2. As shown in FIG. 7, the branch pipe portion 22 has an internal flow path R22 inside. The opening H2A communicates with the internal flow path R21 of the main pipe portion 21 via the internal flow path R22 of the branch pipe portion 22. Therefore, in the heat exchange 100, the internal flow path R21 of the main pipe portion 21 communicates with the central flow path R11B of the heat transfer tube 1 via the internal flow path R22 and the two openings H2A. The shape of the opening H2A seen from the left is an elongated hole.
Each of the posterior overhang 22F1 and the anterior overhang 22F3 has one opening H2B, as shown in FIG. The opening H2B is formed on the left front end surface LS22 of each of the posterior overhanging portion 22F1 and the anterior side overhanging portion 22F3. The opening H2B communicates with the internal flow path R21 of the main pipe portion 21 via the internal flow path R22 of the branch pipe portion 22. Therefore, in the heat exchange 100, the internal flow path R21 of the main pipe portion 21 communicates with the rear side flow path R11A of the heat transfer tube 1 via the opening H2B of the internal flow path R22 and the rear side overhanging portion 22F1. Further, in the heat exchange 100, the internal flow path R21 of the main pipe portion 21 communicates with the front side flow path R11C of the heat transfer tube 1 via the opening H2B of the internal flow path R22 and the front side overhanging portion 22F1. The shape of the opening H2B viewed from the left is an elongated hole. The area of the opening H2B is larger than the area of the opening H2A.

As shown in FIG. 5, the non-fitting portion 22N has a large overhanging portion 22N1 and a small overhanging portion 22N2. The large overhanging portion 22N1 extends to the left from the outer peripheral surface CS21 of the main pipe portion 21. The small overhanging portion 22N2 extends from the left surface LS22N1 of the large overhanging portion 22N1 toward the left.
The total length of the outer circumference of the large overhanging portion 22N1 is longer than the total length of the outer circumference of the small overhanging portion 22N2 on each of the cut surfaces of the large overhanging portion 22N1 and the small overhanging portion 22N2 cut along the planes orthogonal to the left-right direction.
The opening H2A, the opening H2B, and the opening H2C are examples of the second opening.

In the first embodiment, the wall thickness L22N2 (see FIG. 7) of the small overhanging portion 22N2 of the non-fitting portion 22N is thicker than the wall thickness L22F2 (see FIG. 7) of the central overhanging portion 22F2 of the fitting portion 22F. In other words, the wall thickness of the non-fitting portion 22N is thicker than the wall thickness of the fitting portion 22F.

The dimensions of the branch pipe portion 22 are not particularly limited, and are appropriately adjusted according to the type of heating element and the like.
When the heating element is arranged on the upper main surface TS100, the length L4 (see FIG. 7) in the left-right direction of the fitting portion 22F is preferably 0.2 cm or more and 10 cm or less, and more preferably 0.5 cm. The length L5 (see FIG. 7) of the small overhanging portion 22N2 in the left-right direction is preferably 0.2 cm or more and 10 cm or less, and more preferably 0.3 cm or more and 4 cm or less.

(1.3.3) Outlet end portion The outlet end portion 23 is a portion for connecting to an external supply component.

As shown in FIG. 8, the outlet end portion 23 has a connecting pipe portion 231, an O-ring 232, an upper protruding fixing portion 233, and a lower protruding fixing portion 234. The connection pipe portion 231 is an example of the supply component connection pipe portion of the first manifold. The O-ring 232 is an example of the first packing. The upper protruding fixing portion 233 and the lower protruding fixing portion 234 are examples of the first protruding fixing portion.

The connection pipe portion 231 is a portion connected to an external supply component. Specifically, the connecting pipe portion 231 is inserted inside the supply component. The outer diameter of the connecting pipe portion 231 is smaller than the outer diameter of the main pipe portion 21. The connecting pipe portion 231 has an opening H21A. The opening H21A communicates with the internal flow path R21 of the main pipe portion 21.

The O-ring 232 seals the gap between the supply component connected to the connecting pipe portion 231 and the connecting pipe portion 231. The outer peripheral surface CS231 of the connecting pipe portion 231 has an annular groove G231. The annular groove G231 is formed over the entire circumference of the connecting pipe portion 231 around the axis. The O-ring 232 is fitted in the annular groove G231.

The upper protruding fixing portion 233 projects upward from the outer peripheral surface CS21 of the main pipe portion 21. The upper protruding fixing portion 233 has a screw hole SC1. The screw hole SC1 is used to screw the supply component to the upper protruding fixing portion 233. In other words, the screw hole SC1 is used to fix the supply component to the spigot end portion 23.
The lower protruding fixing portion 234 protrudes downward from the outer peripheral surface CS21 of the main pipe portion 21. The lower protruding fixing portion 234 has a screw hole SC2. The screw hole SC2 is used for screwing the supply component to the lower protruding fixing portion 234. In other words, the screw hole SC2 is used to fix the supply component to the spigot end portion 23.

(1.3.4) Receiving port end portion The receiving port end portion 24 is a portion for connecting to an external supply component.

As shown in FIG. 9, the receiving end portion 24 has an upper protruding fixing portion 241 and a lower protruding fixing portion 242. The receiving end portion 24 has an opening H21B. The opening H21B communicates with the internal flow path R21 of the main pipe portion 21. The upper protruding fixing portion 241 and the lower protruding fixing portion 242 are examples of the first protruding fixing portion.

The upper protruding fixing portion 241 projects upward from the outer peripheral surface CS21 of the main pipe portion 21. The upper protruding fixing portion 241 has a screw hole SC3. The screw hole SC3 is used for screwing the supply component to the upper protruding fixing portion 241. In other words, the screw hole SC3 is used to fix the supply component to the receiving end portion 24.
The lower protruding fixing portion 242 projects downward from the outer peripheral surface CS21 of the main pipe portion 21. The lower protruding fixing portion 242 has a screw hole SC4. The screw hole SC4 is used for screwing the supply component to the lower protruding fixing portion 242. In other words, the screw hole SC4 is used to fix the supply component to the receiving end portion 24.

(1.3.5) Material of Supply Manifold The resin constituting the supply manifold 2A is not particularly limited and may be selected according to the application of the heat exchanger 100 and the like. Examples of the resin constituting the supply manifold 2A include a thermoplastic resin and a thermosetting resin. The thermoplastic resin contains an elastomer. Examples of the thermoplastic resin include polyolefin resins, polyvinyl chlorides, polyvinylidene chlorides, polystyrene resins, acrylonitrile styrene (AS) resins, acrylic nitrile butadiene styrene (AB) resins, polyester resins, poly (meth) acrylic resins, and the like. Examples thereof include polyvinyl alcohol, polycarbonate resin, polyamide resin, polyimide resin, polyether resin, polyacetal resin, fluororesin, polysulfone resin, polyphenylene sulfide resin, and polyketone resin. Examples of the thermosetting resin include phenol resin, melamine resin, urea resin, polyurethane resin, epoxy resin, unsaturated polyester resin and the like. These resins may be used alone or in combination of two or more.

The resin constituting the supply manifold 2A may contain various compounding agents. Examples of the compounding agent include fillers, heat stabilizers, antioxidants, pigments, weather resistant agents, flame retardants, plasticizers, dispersants, lubricants, mold release agents, antistatic agents and the like.

(1.4) Recovery Manifold Next, the recovery manifold 2B according to the first embodiment of the present disclosure will be described.

The recovery manifold 2B is an integrally resin molded product. The recovery manifold 2B is a header that recovers the cooling medium from each of the plurality of heat transfer tubes 1.

The recovery manifold 2B is paired with the supply manifold 2A. Except for the point that the branch pipe portion 22 protrudes to the right from the outer peripheral surface CS21 of the main pipe portion 21, and that external discharge parts are connected to each of the outlet end portion 23 and the receiving end portion 24. It has the same configuration as the supply manifold 2A.

The recovery manifold 2B has a main pipe portion 21, a plurality of branch pipe portions 22, a spigot end portion 23, and a receiving port end portion 24. The main pipe portion 21 is an example of the second main body portion of the second manifold. The branch pipe portion 22 is an example of the second connecting pipe portion of the second manifold.

Examples of the resin constituting the recovery manifold 2B include the same resins as those exemplified as the resin constituting the supply manifold 2A. The resin constituting the recovery manifold 2B and the resin constituting the supply manifold 2A may be the same or different.

(1.5) Supply-side resin fixing portion Next, the supply-side resin fixing portion 3A according to the first embodiment of the present disclosure will be described with reference to FIGS. 1, 2, 6 to 9.

The supply-side resin fixing portion 3A is an insert molded product of the resin composition. The insert molded product means a product formed by insert molding. Insert molding will be described later with reference to FIG.

The supply-side resin fixing portion 3A fixes the supply manifold 2A to the heat transfer tube 1.

As shown in FIGS. 2 and 7, the supply-side resin fixing portion 3A is in contact with the outer peripheral surface CS12 of the supply-side connection pipe portion 12 of the heat transfer tube 1 and the outer peripheral surface CS22N2 of the small overhanging portion 22N2 of the supply manifold 2A. .. The supply-side resin fixing portion 3A covers the entire circumference of the outer peripheral edge RE1 of the right end surface RS1 of the heat transfer tube 1.

Hereinafter, among the outer peripheral surface CS12 of the supply side connection tube portion 12 of the heat transfer tube 1, the surface in contact with the supply side resin fixing portion 3A may be referred to as “resin fixing surface FS12”.

In the first embodiment, as shown in FIG. 7, in the left-right direction, the outer peripheral edge LE3 on the left side of the supply-side resin fixing portion 3A (the side opposite to the non-fitting portion 22N) is the left end surface of the fitting portion 22F. It is located on the right side (non-fitting portion 22N side) of the outer peripheral edge LE22 of the LS22. In other words, the fitting portion 22F is located inside the heat transfer tube 1 facing the resin fixing surface FS12.

The resin fixing surface FS12 has a roughened surface. In other words, the resin fixing surface FS12 is roughened. The details of the roughening process will be described in the roughening step described later.

By applying the roughening treatment to the resin fixing surface FS12, an uneven structure is formed on the resin fixing surface FS12. The uneven structure is not particularly limited as long as the bonding strength between the supply-side resin fixing portion 3A and the heat transfer tube 1 can be sufficiently obtained. The average pore diameter of the recesses in the concave-convex structure may be, for example, 5 nm or more and 250 μm or less, preferably 10 nm or more and 150 μm or less, and more preferably 15 nm or more and 100 μm or less. The average hole depth of the recesses in the concave-convex structure may be, for example, 5 nm or more and 250 μm or less, preferably 10 nm or more and 150 μm or less, and more preferably 15 nm or more and 100 μm or less. When either or both of the average hole diameter and the average hole depth of the recesses in the uneven structure is within the above numerical range, a stronger bond tends to be obtained.

The average pore diameter and the average pore depth of the recesses in the concave-convex structure can be determined by using an electron microscope or a laser microscope. Specifically, the surface and cross section of the resin fixing surface FS12 are photographed. From the obtained photographs, 50 arbitrary recesses can be selected, and the average hole diameter and the average hole depth of the recesses can be calculated as arithmetic mean values from the hole diameters and hole depths of those recesses.

In the first embodiment, the resin composition constituting the supply-side resin fixing portion 3A is a resin having compatibility with the resin constituting the supply manifold 2A. As a result, the resin fixing portion 3A on the supply side and the outer peripheral surface CS22N2 of the small overhanging portion 22N2 of the supply manifold 2A are fused. In the present disclosure, "having compatibility" means that the resin constituting the resin fixing portion is mixed without being separated in an atmosphere where the resin is melted. It is preferable that the main component of the resin constituting the supply-side resin fixing portion 3A is the same as the resin constituting the supply manifold 2A.

The dimensions of the supply-side resin fixing portion 3A are not particularly limited, and are appropriately adjusted according to the type of heating element and the like.
When the heating element is arranged on the upper main surface TS100, the length L6 (see FIG. 7) of the resin fixing surface FS12 in the left-right direction is preferably 0.1 cm or more and 10 cm or less, more preferably 0.3 cm or more and 4 cm. It is as follows.

(1.6) Recovery-side resin fixing portion Next, the recovery-side resin fixing portion 3B according to the first embodiment of the present disclosure will be described.

The recovery-side resin fixing portion 3B is an insert molded product of the resin composition.

The recovery-side resin fixing portion 3B is the same as the supply-side resin fixing portion 3A except that the recovery manifold 2B is fixed to the heat transfer tube 1 instead of the supply-side resin fixing portion 2A.

In the first embodiment, the resin composition constituting the recovery-side resin fixing portion 3B is a resin having compatibility with the resin constituting the recovery manifold 2B.

(1.7) Flow of Cooling Medium Next, with reference to FIG. 10, the flow of the cooling medium circulating in the heat exchanger 100 will be described. FIG. 10 is a perspective view showing the appearance of the heat exchanger according to the first embodiment. In FIG. 10, reference numeral F1 indicates the flow direction of the cooling medium supplied to the opening H21A and the opening H21B of the supply manifold 2A to the heat exchanger 100. Reference numeral F2 indicates the flow direction of the cooling medium flowing from the internal flow path R21 of the supply manifold 2A to the internal flow path R11 of the heat transfer tube 1. Reference numeral F3 indicates the flow of the cooling medium flowing through the internal flow path R11 of the heat transfer tube 1. Reference numeral F4 indicates the flow direction of the cooling medium flowing from the internal flow path R11 of the heat transfer tube 1 to the internal flow path R21 of the recovery manifold 2B. Reference numeral F4 indicates the flow direction of the cooling medium discharged from the opening H2A and the opening 214 of the recovery manifold 2B.

The heat exchanger 100 is used, for example, by installing the heat exchanger 100 so that the upper main surface TS100 of the heat exchanger 100 is in physical contact with the heating element. At this time, an external supply component is connected to the supply manifold 2A. An external discharge component is connected to the recovery manifold 2B. The heat of the heating element is conducted to the cooling medium filled in the internal flow path R11 via the plurality of heat transfer tubes 1.

The cooling medium is supplied to the openings H21A and the openings H21B of the supply manifold 2A along the flow direction F1. The cooling medium supplied from the opening H21A and the opening H21B moves along the flow direction F2 to the internal flow path R11 of the heat transfer tube 1 via the internal flow path R21 and the internal flow path R22 of the supply manifold 2A. The cooling medium that has reached the internal flow path R11 of the heat transfer tube 1 moves in the internal flow path R11 toward the recovery manifold 2B along the flow direction F3. At this time, the cooling medium is heated by heat exchange with the tube main body 11. On the other hand, the tube main body 11 is cooled by heat exchange with the cooling medium. Next, the warmed cooling medium moves from the internal flow path R11 of the heat transfer tube 1 to the internal flow path R21 and the internal flow path R22 of the recovery manifold 2B along the flow direction F4, and reaches the openings H21A and the opening H21B. do. The cooling medium that has reached the openings H21A and the opening H21B of the recovery manifold 2B is discharged from each of the openings H21A and the opening H21B to an external discharge component along the flow direction F5. In this way, the cooling medium absorbs heat from the heating element inside the heat exchanger 100 and discharges it to the outside of the heat exchanger 100. That is, the heat exchanger 100 promotes heat dissipation of the heating element.

(1.7) Method for Manufacturing Heat Exchanger Next, a method for manufacturing the heat exchanger 100 according to the first embodiment of the present disclosure will be described with reference to FIGS. 1 to 11. FIG. 11 is a cross-sectional view of the insert 80 according to the first embodiment in a state where the injection molding die 90 is molded. In FIG. 11, the sprue of the injection molding die 90, the hot runner, and the like are omitted.

The method for manufacturing the heat exchanger 100 according to the first embodiment includes a preparation step, a roughening step, a fitting step, and an insert molding step. The preparation step, the roughening step, the fitting step, and the insert molding step are performed in this order.

(1.7.1) Preparation step The preparation step includes a first preparation step, a second preparation step, and a third preparation step. The execution order of the first preparation step, the second preparation step, and the third preparation step is not particularly limited. Hereinafter, the first preparation step, the second preparation step, and the third preparation step will be described in this order.

(1.7.1.1) First Preparation Step In the first preparation step, a plurality of heat transfer tubes 1 are prepared. The method for preparing the heat transfer tube 1 is not particularly limited, and examples thereof include extrusion molding. The heat transfer tube 1 may be a commercially available product.

(1.7.1.2) Second preparation step In the second preparation step, the supply manifold 2A is prepared. The method for preparing the supply manifold 2A is not particularly limited, and examples thereof include resin molding and the like. Examples of the resin molding include injection molding, casting molding, press molding, insert molding, extrusion molding, transfer molding and the like.

(1.7.1.3) Third preparation step In the third preparation step, the recovery manifold 2B is prepared. The method for preparing the recovery manifold 2B is not particularly limited, and examples thereof include resin molding.

(1.7.2) Roughing step In the roughening step, the resin fixing surface FS12 of the heat transfer tube 1 is roughened. As a result, a fine uneven structure is formed on the resin fixing surface FS12 before the insert molding step is executed. Therefore, in the insert molding step, the melt of the resin composition (hereinafter, referred to as “resin melt”) constituting the supply-side resin fixing portion 3A and the recovery-side resin fixing portion 3B is fixed to the resin by the injection pressure. It is easy to enter into the gap of the fine uneven structure of the surface FS12. In other words, due to the anchor effect, a resin fixing portion that firmly adheres to the heat transfer tube 1 can be obtained as compared with the case where the roughening treatment is not applied. As a result, the heat exchanger 100 that can maintain the hermeticity for a long period of time is obtained.

The method of performing the roughening treatment is not particularly limited. The roughening treatment method is, for example, a method using a laser as disclosed in Patent No. 4020957; the outer peripheral surface of the heat transfer tube 1 in an aqueous solution of an inorganic base such as NaOH or an inorganic acid such as HCl or HNO ₃ . Method of immersing CS1; Method of treating the outer peripheral surface CS1 of the heat transfer tube 1 by anodization as disclosed in Japanese Patent No. 4541153; Acid-based as disclosed in International Publication No. 2015-8847. Substitution crystallization etching with an aqueous acid-based etching agent containing an etching agent (preferably an inorganic acid, ferric ion or ferric ion) and, if necessary, manganese ion, aluminum chloride hexahydrate, sodium chloride and the like. Method; A method of immersing the outer peripheral surface CS1 of the heat transfer tube 1 in one or more aqueous solutions selected from hydrated hydrazine, ammonia, and a water-soluble amine compound as disclosed in International Publication No. 2009/31632; Hot water treatment methods as disclosed in Kai 2008-162115; blast treatment and the like can be mentioned. The roughening treatment method can be used properly according to the material of the heat transfer tube 1, the state of the desired uneven structure, and the like.

In the roughening step, the resin-fixed surface FS12 may be subjected to a treatment for adding a functional group (hereinafter, referred to as “surface modification treatment”) in addition to the roughening treatment. By subjecting the resin fixing surface FS12 to the surface modification treatment, the chemical bond between the resin fixing surface FS12 and the supply side resin fixing portion 3A and the recovery side resin fixing portion 3B increases. As a result, the bonding strength of the supply-side resin fixing portion 3A and the recovery-side resin fixing portion 3B with respect to the heat transfer tube 1 tends to be further improved.

It is preferable that the surface modification treatment is performed at the same time as the roughening treatment or after the roughening treatment.

The method of applying the surface modification treatment is not particularly limited. The method of applying the surface modification treatment is, for example, a method of immersing the surface of the heat transfer tube 1 in a solution in which a chemical substance having a functional group is dissolved in water or an organic solvent; a chemical substance having a functional group or a solution containing the same is used as a resin. A method of coating or spraying on the fixing surface FS12; a method of attaching a film containing a chemical substance having a functional group to the resin fixing surface FS12 and the like can be mentioned. Organic solvents include methyl alcohol, isopropyl alcohol, ethyl alcohol, acetone, toluene, ethyl cell solve, dimethyl formaldehyde, tetrahydrofuran, methyl ethyl ketone, benzene, or ethyl acetate ether. Examples of the method of performing the treatment for adding a functional group at the same time as the roughening treatment include a method of performing a wet etching treatment, a chemical conversion treatment, an anodizing treatment and the like using a liquid containing a chemical substance having a functional group.

(1.7.3) Fitting Step The fitting step includes a first fitting step and a second fitting step. The execution order of the first fitting step and the second fitting step is not particularly limited. Hereinafter, the first fitting step and the second fitting step will be described in this order.

(1.7.3.1) First Fitting Step In the first fitting step, each supply-side connecting pipe portion 12 of the plurality of heat transfer tubes 1 is fitted to the branch pipe portion 22 of the supply manifold 2A. Specifically, the branch pipe portion 22 of the supply manifold 2A is inserted into the inside of each supply side connection pipe portion 12 of the plurality of heat transfer tubes 1. As a result, the fitting portion 22F of the supply manifold 2A is fitted into the inside of the supply side connection tube portion 12 of the heat transfer tube 1 through the opening H1 of the supply side connection tube portion 12 of the heat transfer tube 1. In other words, each of the plurality of heat transfer tubes 1 is connected to the supply manifold 2A.

(1.7.3.2) Second Fitting Step In the second fitting step, the recovery side connecting pipe portion 13 of each of the plurality of heat transfer tubes 1 is fitted to the branch pipe portion 22 of the recovery manifold 2B. Specifically, the branch pipe portion 22 of the recovery manifold 2B is inserted into the inside of each recovery side connection pipe portion 13 of the plurality of heat transfer tubes 1. As a result, the fitting portion 22F of the recovery manifold 2B is fitted inside the recovery side connection tube portion 13 of the heat transfer tube 1 through the opening H1 of the recovery side connection tube portion 13 of the heat transfer tube 1. In other words, each of the plurality of heat transfer tubes 1 is connected to the recovery manifold 2B.

By executing the first fitting step and the second fitting step, the insert 80 is obtained. The insert 80 is formed by connecting each of the plurality of heat transfer tubes 1 to each of the supply manifold 2A and the recovery manifold 2B.

(1.7.4) Insert Molding Step The insert molding step includes a first insert molding step and a second insert molding step. The execution order of the first insert molding step and the second insert molding step is not particularly limited. It is preferable that the first insert molding step and the second insert molding step are executed at the same time from the viewpoint of reducing the manufacturing cost. Hereinafter, the first insert molding step and the second insert molding step will be described in this order.

(1.7.4.1) First Insert Molding Step In the first insert molding step, the supply-side connecting tube portion of the heat transfer tube 1 covers the entire circumference of the outer peripheral edge RE1 of the right end surface RS1 of the heat transfer tube 1. A supply-side resin fixing portion 3A is formed by insert molding on the outer peripheral surface CS12 of 12 and the outer peripheral surface CS22N2 of the small overhanging portion 22N2 of the supply manifold 2A. As a result, the supply manifold 2A is fixed to the heat transfer tube 1 by the supply-side resin fixing portion 3A.

An injection molding machine is used for insert molding. The injection molding machine includes an injection molding die 90, an injection device, and a mold clamping device. As shown in FIG. 11, the injection-molded mold 90 includes a movable-side mold 91 and a fixed-side mold 92. The fixed-side mold 92 is fixed to the injection molding machine. The movable side mold 91 is movable with respect to the fixed side mold 92. The injection device ejects a melt (hereinafter referred to as “resin melt”) of the resin composition constituting the supply-side resin fixing portion 3A and the recovery-side resin fixing portion 3B at a predetermined injection pressure into an injection molding mold 90. Pour into the sprue. The mold clamping device tightens the movable side mold at a high pressure so that the movable side mold does not open due to the filling pressure of the resin melt.

First, the movable side mold 90 is opened, the insert 80 is installed on the fixed side mold 92, the movable side mold 91 is closed, and the mold is fastened. That is, the insert 80 is housed in the injection molding die 90. As a result, the first space R91 and the second space R92 are formed between the insert 80 and the injection molding die 90. The first space R91 indicates a space forming the supply-side resin fixing portion 3A. The second space R92 indicates a space for accommodating the main pipe portion 21 in the injection molding die 90. Next, the injection molding machine fills the first space R91 with the resin melt at a high pressure.

At this time, the inner peripheral surface IS12 of the supply side connecting pipe portion 12 of the heat transfer tube 1 is in contact with the outer peripheral surface CS22F of the fitting portion 22F of the supply manifold 2A. That is, at the time of insert molding, the fitting portion 22F of the supply manifold 2A functions as a support for the heat transfer tube 1. As a result, even if injection pressure is applied to the supply side connection tube portion 12 of the heat transfer tube 1 toward the inside of the heat transfer tube 1 in the radial direction of the heat transfer tube 1, the supply side connection tube portion 12 of the heat transfer tube 1 is not easily deformed. ..

In the first embodiment, a part of the transfer side surface S91 of the movable mold 91 comes into contact with the outer peripheral surface CS22N1 of the large overhanging portion 22N1. That is, the path connecting the first space R91 and the second space R92 is blocked by the contact between the transfer side surface 91S and the outer peripheral surface CS22N1 of the large overhanging portion 22N1. Therefore, even if the resin melt is filled in the first space R91, the molten resin in the first space R91 does not move into the second space R92. As a result, the generation of burrs caused by the resin melt invading the second space R92 is suppressed. That is, the heat exchanger 100 in which an unnecessary resin shape such as a burr is not formed can be obtained.

Next, the resin melt in the injection molding die 90 is cooled and solidified. As a result, the supply-side resin fixing portion 3A is formed on the insert 80.

(1.7.4.2) Second insert molding step In the second insert molding step, the outer peripheral edge LE1 (see FIG. 3) of the left end surface LS1 (see FIG. 3) of the heat transfer tube 1 is covered with the entire circumference. The recovery side resin fixing portion 3B is formed by insert molding on the outer peripheral surface CS13 of the recovery side connection pipe portion 13 of the heat transfer tube 1 and the outer peripheral surface CS22N2 of the small overhanging portion 22N2 of the recovery manifold 2B. As a result, the recovery manifold 2B is fixed to the heat transfer tube 1.

The second insert molding step is executed in the same manner as the first insert molding step. As a result, the recovery side resin fixing portion 3B is formed on the insert 80.

By executing the first insert molding step and the second insert molding step, the heat exchanger 100 is obtained.

(1.8) Action and Effect As described with reference to FIGS. 1 to 11, in the first embodiment, the heat exchanger 100 has a first tube body joining structure and a second tube body joining structure. The first pipe joining structure includes a heat transfer tube 1, a supply manifold 2A, and a supply-side resin fixing portion 3A. The supply-side resin fixing portion 3A is an insert molded product. The supply-side resin fixing portion 3A is in contact with the outer peripheral surface CS12 of the supply-side connection pipe portion 12 and the outer peripheral surface CS22N2 of the small overhanging portion 22N2 of the supply manifold 2A, and is the entire outer peripheral edge RE1 of the right end surface RS1 of the heat transfer tube 1. The branch pipe portion 22 is fixed to the supply side connection pipe portion 12 so as to cover the circumference.
The outer peripheral edge RE1 of the right end surface RS1 of the heat transfer tube 1 is easily deformed when a pressing force is applied. In the first aspect, when the supply-side resin fixing portion 3A is insert-molded, the portion where the supply-side resin fixing portion 3A of the heat transfer tube 1 is formed is inside the heat transfer tube 1 in the radial direction of the heat transfer tube 1. Pushing pressure is applied toward. At this time, the fitting portion 22F of the supply manifold 2A functions as a support for the outer peripheral edge RE1 of the right end surface RS1 of the heat transfer tube 1. Therefore, the outer peripheral edge RE1 of the right end surface RS1 of the heat transfer tube 1 is not easily deformed. As a result, the first tube body joining structure is excellent in airtightness even if the heat transfer tube 1 and the supply manifold 2A are not brazed.

The second tube body joining structure includes a heat transfer tube 1, a recovery manifold 2B, and a recovery side resin fixing portion 3B. Similar to the first tube body joining structure, the second tube body joining structure is also excellent in airtightness even if the heat transfer tube 1 and the recovery manifold 2B are not brazed. Hereinafter, since the second tubular body joining structure has the same function and effect as the first tubular body joining structure, the description of the second tubular body joining structure will be omitted.

As described with reference to FIGS. 1 to 11, in the first embodiment, the strut area ratio is preferably 30 area% or more and 80 area% or less.
As a result, when the supply-side resin fixing portion 3A is insert-molded, the fitting portion 22F of the supply manifold 2A functions more strongly as a support for the portion where the supply-side resin fixing portion 3A of the heat transfer tube 1 is formed. Therefore, the supply-side resin fixing portion 3A of the heat transfer tube 1 is less likely to be deformed.

As described with reference to FIGS. 1 to 11, in the first embodiment, as shown in FIG. 7, in the left-right direction, the outer peripheral edge LE3 of the supply-side resin fixing portion 3A is the fitting portion of the supply manifold 2A. It is located on the right side of the outer peripheral edge LE22 of the left front end surface LS22 of the 22F.
In other words, the fitting portion 22F of the supply manifold 2A exists inside the resin fixing surface FS12 of the heat transfer tube 1. As a result, when the supply-side resin fixing portion 3A is insert-molded, the fitting portion 22F of the supply manifold 2A functions as a support for the portion where the supply-side resin fixing portion 3A of the heat transfer tube 1 is formed. As a result, the supply-side resin fixing portion 3A of the heat transfer tube 1 is not easily deformed. Therefore, the first tube body joining structure is more excellent in airtightness even if the heat transfer tube 1 and the supply manifold 2A are not brazed.

As described with reference to FIGS. 1 to 11, in the first embodiment, as shown in FIG. 7, the wall thickness of the non-fitting portion 22N of the branch pipe portion 22 of the supply manifold 2A is the fitting portion 22F. It is thicker than the wall thickness of.
As a result, the bending strength of the non-fitting portion 22N is stronger than that of the fitting portion 22F. Therefore, when the supply-side resin fixing portion 3A is insert-molded, even if a pressing force is applied to the portion where the supply-side resin fixing portion 3A is formed in the non-fitting portion 22N of the supply manifold 2A, the non-fitting portion 22N remains. , More difficult to deform.

As described with reference to FIGS. 1 to 11, in the first embodiment, the resin fixing surface FS12 of the heat transfer tube 1 has a roughened surface.
That is, the resin fixing surface FS12 of the heat transfer tube 1 has a roughened surface. As a result, the supply-side resin fixing portion 3A is firmly fixed to the supply manifold 2A. As a result, the first tubular body joint structure can maintain the hermeticity for a long period of time.

As described with reference to FIGS. 1 to 11, in the first embodiment, the branch pipe portion 22 of the supply manifold 2A is made of resin. The small overhanging portion 22N2 of the non-fitting portion 22N of the branch pipe portion 22 and the supply-side resin fixing portion 3A are fused.
As a result, the supply-side resin fixing portion 3A is strongly fixed to the non-fitting portion 22N of the supply manifold 2A. As a result, the first tubular body joint structure can maintain the hermeticity for a long period of time.

As described with reference to FIGS. 1 to 11, in the first embodiment, the heat exchanger 100 includes a first pipe joining structure and a second pipe joining structure.
As a result, the heat exchanger is excellent in airtightness even if the heat transfer tube 1 and the manifold 2 are not brazed.

As described with reference to FIGS. 1 to 11, in the first embodiment, the heat exchanger 100 includes a plurality of heat transfer tubes 1, a supply manifold 2A, a recovery manifold 2B, and a supply-side resin fixing portion 3A. , The recovery side resin fixing portion 3B is provided.
In the conventional heat exchanger, the heat transfer tube and the manifold are fixed by brazing. When a conventional heat exchanger is installed in an environment that is susceptible to external vibration, the stress caused by external vibration tends to act locally on the brazed portion that is the joint surface between the heat transfer tube and the manifold. .. Therefore, the brazed portion may be easily damaged. Further, in the conventional heat exchanger, for example, when it is used in an environment where dew condensation is likely to occur, the brazed portion may be easily corroded.
On the other hand, the supply-side resin fixing portion 3A is formed on the outer peripheral surface CS12 of the supply-side connection pipe portion 12 of the heat transfer tube 1 and the outer peripheral surface CS22 of the branch pipe portion 22 of the supply manifold 2A inserted into the heat transfer tube 1. ing. The supply-side resin fixing portion 3A covers the entire circumference of the outer peripheral edge RE1 of the front end surface RS1 of the heat transfer tube 1 into which the supply-side connection tube portion 12 of the heat transfer tube 1 is inserted. Therefore, even if the heat exchanger 100 is installed in an environment that is susceptible to vibration from the outside, the stress caused by the vibration from the outside is unlikely to act locally as in the conventional heat exchanger. Further, even if the heat exchanger 100 is used in an environment where dew condensation is likely to occur, the supply-side resin fixing portion 3A is less likely to corrode. As a result, the heat exchanger 100 can maintain excellent airtightness for a long period of time.

As described with reference to FIGS. 1 to 11, in the first embodiment, as shown in FIG. 8, each of the supply manifold 2A and the recovery manifold 2B has a connecting pipe portion 231 and an O-ring 232. ..
As a result, the heat exchanger 100 can prevent the heat exchange medium from leaking or foreign matter from the outside through the gap between the supply component connecting pipe portion 23 and the supply component and the gap between the recovery component connection pipe portion 24 and the recovery component. It can be prevented more reliably than the case where the ring 232 is not provided.

As described with reference to FIGS. 1 to 11, in the first embodiment, each of the supply manifold 2A and the recovery manifold 2B is made of resin. Each of the supply manifold 2A and the recovery manifold 2B has an upper protruding fixing portion 233 and a lower protruding fixing portion 234 as shown in FIGS. 8 and 9.
As a result, the supply component is screwed to the upper protruding fixing portion 233 and the lower protruding fixing portion 234 of the supply manifold 2A. The recovered parts are attached to the upper protruding fixing portion 233 and the lower protruding fixing portion 234 of the recovery manifold 2B. As a result, it is possible to suppress the occurrence of the supply component falling off from the supply manifold 2A and the occurrence of the recovery component falling out of the recovery manifold 2B.
Further, each of the supply manifold 2A and the recovery manifold 2B is an integrally resin molded product. Therefore, each of the upper protruding fixing portion 233 and the lower protruding fixing portion 234 of the supply manifold 2A and the recovery manifold 2B is attached to the outer peripheral surface CS21 of the main pipe portion 21 by brazing or welding like a conventional metal manifold. Not installed separately. Therefore, the heat exchanger 100 is superior in manufacturing cost to the case where at least one of the supply manifold 2A and the recovery manifold 2B is made of metal.

As described with reference to FIGS. 1 to 11, in the first embodiment, the method for manufacturing the heat exchanger 100 includes a first preparation step, a second preparation step, a third preparation step, and a first fitting. It has a joining step, a second fitting step, a first insert molding step, and a second insert molding step.
This gives the heat exchanger 400 that can maintain excellent airtightness for a long period of time.

(2) Second Embodiment Next, the heat exchanger 400 according to the second embodiment of the present disclosure will be described with reference to FIGS. 1 to 12. FIG. 12 is a perspective view showing the appearance of the heat exchanger 400 according to the second embodiment.

The heat exchanger 400 according to the second embodiment is different from the heat exchanger 400 according to the first embodiment in that it is a connecting body of the front side heat exchanger divided body 401 and the rear side heat exchanger divided body 402.

In the second embodiment, the heat exchanger 400 includes a front heat exchanger divider 401 and a rear heat exchanger divider 402. Each configuration of the front side heat exchanger split body 401 and the rear side heat exchanger split body 402 is the same as that of the heat exchanger 100 according to the first embodiment.

The front heat exchanger split body 401 includes a plurality of heat transfer tubes 1, a supply manifold 2A, a recovery manifold 2B, a plurality of supply side resin fixing portions 3A, and a plurality of recovery side resin fixing portions 3B. Each of the supply manifold 2A and the recovery manifold 2B has a main pipe portion 21, a plurality of branch pipe portions 22, a spigot end portion 23, and a receiving end portion 24. The receiving end 24 of the supply manifold 2A and the recovery manifold 2B of the front heat exchanger divider 401 is used to connect to the rear heat exchanger divider 402.
The supply manifold 2A of the front heat exchanger split body 401 is an example of the first manifold split body. The recovery manifold 2B of the front heat exchanger split body 401 is an example of the second manifold split body. The plurality of branch pipe portions 22 of the supply manifold 2A of the front heat exchanger split body 401 is an example of the second connection pipe portion of the first manifold split body. The plurality of branch pipe portions 22 of the recovery manifold 2B of the front heat exchanger split body 401 is an example of the second connection pipe portion of the second manifold split body. The receiving end portion 24 of the supply manifold 2A of the front heat exchanger split body 401 is an example of the first connecting pipe portion. The receiving end portion 24 of the recovery manifold 2B of the front heat exchanger split body 401 is an example of the second connecting pipe portion.

The rear heat exchanger split body 402 includes a plurality of heat transfer tubes 1, a supply manifold 2A, a recovery manifold 2B, a plurality of supply side resin fixing portions 3A, and a plurality of recovery side resin fixing portions 3B. Each of the supply manifold 2A and the recovery manifold 2B has a main pipe portion 21, a plurality of branch pipe portions 22, a spigot end portion 23, and a receiving end portion 24. The outlet end 23 of the supply manifold 2A and the recovery manifold 2B of the rear heat exchanger divider 402 is used to connect to the front heat exchanger divider 401.
The supply manifold 2A of the rear heat exchanger split body 402 is an example of the first manifold split body. The recovery manifold 2B of the rear heat exchanger split body 402 is an example of the second manifold split body. The plurality of branch pipe portions 22 of the supply manifold 2A of the rear heat exchanger split body 402 is an example of the second connection pipe portion of the first manifold split body. The plurality of branch pipe portions 22 of the recovery manifold 2B of the rear heat exchanger split body 402 are an example of the second connection pipe portion of the second manifold split body. The outlet end portion 23 of the supply manifold 2A of the rear heat exchanger split body 402 is an example of the first connecting pipe portion. The outlet end portion 23 of the recovery manifold 2B of the rear heat exchanger split body 402 is an example of the second connecting pipe portion.

The heat exchanger 400 is formed by connecting the front side heat exchanger division body 401 and the rear side heat exchanger division body 402. Specifically, the outlet end 23 of the supply manifold 2A and the recovery manifold 2B of the rear heat exchanger divider 401 is different from the inlet end 24 of the supply manifold 2A and the recovery manifold 2B of the front heat exchanger divider 402. It is included. The upper protruding fixing portion 233 of the supply manifold 2A and the recovery manifold 2B of the rear heat exchanger divider 401 and the upper protruding fixing portion 241 of the supply manifold 2A and the recovery manifold 2B of the front heat exchanger divider 402 are screw-fixed. ing. The lower protruding fixing portion 234 of the supply manifold 2A and the recovery manifold 2B of the rear heat exchanger divider 401 and the lower protruding fixing portion 242 of the supply manifold 2A and the recovery manifold 2B of the front heat exchanger divider 402 are screwed together. It is fixed.

Next, a method of manufacturing the heat exchanger 400 according to the second embodiment of the present disclosure will be described.

The method for manufacturing the heat exchanger 400 according to the second embodiment includes a preparation step, a roughening step, a fitting step, an insert molding step, and a connecting step. The preparation step, the roughening step, the fitting step, the insert molding step, and the connecting step are performed in this order.

Each of the preparation step, the roughening step, the fitting step, and the insert molding step is the preparation step, the roughening step, the fitting step, and the insert molding step described in the manufacturing method of the heat exchanger 100 according to the first embodiment. It is executed in the same way as each of.

The connecting step includes a first connecting step and a second connecting step. The execution order of the first connecting step and the second connecting step is not particularly limited. Hereinafter, the first connecting step and the second connecting step will be described in this order.

In the first connection step, the receiving end portion 24 of the supply manifold 2A of the front heat exchanger divider 401 and the outlet end portion 23 of the supply manifold 2A of the rear heat exchanger divider 402 are connected. Specifically, the outlet end 23 of the supply manifold 2A of the rear heat exchanger 402 is inserted into the receiving end 24 of the supply manifold 2A of the front heat exchanger divider 401. Next, the upper protruding fixing portion 233 of the supply manifold 2A of the rear heat exchanger divider 401 and the upper protruding fixing portion 241 of the supply manifold 2A of the front heat exchanger divider 402 are screw-fixed and the rear heat exchange is performed. The lower protruding fixing portion 234 of the supply manifold 2A of the device divider 401 and the lower protruding fixing portion 242 of the supply manifold 2A of the front heat exchanger divider 402 are screw-fixed.

In the second connecting step, the receiving end portion 24 of the recovery manifold 2B of the front side heat exchanger splitting body 401 and the outlet end portion 23 of the recovery manifold 2B of the rear side heat exchanger dividing body 402 are connected. Specifically, the outlet end 23 of the recovery manifold 2B of the rear heat exchanger 402 is inserted into the receiving end 24 of the recovery manifold 2B of the front heat exchanger divider 401. Next, the upper protruding fixing portion 233 of the recovery manifold 2B of the rear heat exchanger divider 401 and the upper protruding fixing portion 241 of the recovery manifold 2B of the front heat exchanger divider 402 are screw-fixed and the rear heat exchange is performed. The lower protruding fixing portion 234 of the recovery manifold 2B of the device divider 401 and the lower protruding fixing portion 242 of the recovery manifold 2B of the front heat exchanger divider 402 are screw-fixed.

By executing the first connecting step and the second connecting step, the heat exchanger 400 is obtained.

As described with reference to FIGS. 1 to 12, in the second embodiment, the heat exchanger 400 includes a front heat exchanger divider 401 and a rear heat exchanger divider 402. The front side heat exchanger split body 401 and the rear side heat exchanger split body 402 are connected to each other.
Therefore, the heat exchanger is excellent in manufacturing cost even if it is large.

As described with reference to FIGS. 1 to 12, in the second embodiment, the method for manufacturing the heat exchanger 400 is a first preparation step, a second preparation step, a third preparation step, and a first fitting. It has a joining step, a second fitting step, a first insert molding step, a second insert molding step, a first connecting step, and a second connecting step.
As a result, the heat exchanger 400, which can maintain excellent airtightness for a long period of time even if it is large in size, can be manufactured at low cost.

(3) Third Embodiment Next, the heat exchanger 100a according to the third embodiment of the present disclosure will be described with reference to FIGS. 1 to 3, 6, 8, 9, and 13. FIG. 13 is a perspective view showing the appearance of the branch pipe portion 22a of the supply manifold 2Aa according to the third embodiment.

The heat exchanger 100a according to the third embodiment is different from the heat exchanger 100 according to the first embodiment in that the central overhanging portion 22F2a of the branch pipe portion 22a has one opening H2C.

The heat exchanger 100a according to the third embodiment includes a plurality of heat transfer tubes 1, a supply manifold 2Aa, a recovery manifold 2Ba, a plurality of supply-side resin fixing portions 3A, and a plurality of recovery-side resin fixing portions 3B. .. The supply manifold 2Aa has a main pipe portion 21, a plurality of branch pipe portions 22a, a spigot end portion 23, and a receiving port end portion 24. The branch pipe portion 22a has a fitting portion 22F and a non-fitting portion 22N. The fitting portion 22Fa has a rear side overhanging portion 22F1, a central overhanging portion 22F2a, and a front side overhanging portion 22F3.

The central overhang 22F2a has one opening H2C, as shown in FIG. The opening H2C is formed on the left end surface LS22 of the central overhanging portion 22F2a. The opening H2C communicates with the internal flow path R21 of the main pipe portion 21 via the internal flow path R22 of the branch pipe portion 22a. The shape of the opening H2C seen from the left is an elongated hole. The area of the opening H2C is larger than the total area of the two openings H2A (see FIG. 5) according to the first embodiment. As a result, the supply manifold 2Aa according to the second embodiment is easier to distribute the cooling medium than the supply manifold 2Aa according to the first embodiment.

In the recovery manifold 2Ba, the branch pipe portion 22a protrudes to the right from the outer peripheral surface CS21 of the main pipe portion 21, and the outlet end portion 23 and the receiving end portion 24 are connected to external discharge parts. Other than that, it has the same configuration as the supply manifold 2Aa.

(4) Fourth Embodiment Next, with reference to FIGS. 1, 2, 6, 8, 9, 14, and 15, the heat exchanger 100b according to the fourth embodiment of the present disclosure. explain. FIG. 14 is a perspective view showing the appearance of the heat transfer tube 1b according to the fourth embodiment. FIG. 15 is a perspective view showing the appearance of the branch pipe portion 22b of the supply manifold 2Ab according to the fourth embodiment.

The heat exchanger 100b according to the fourth embodiment is related to the first embodiment in that the heat transfer tube 1b does not have a partition wall 14 and the branch tube portion 22b is composed of one overhanging portion 22F4. It is different from the heat exchanger 100.

The heat exchanger 100b according to the fourth embodiment includes a plurality of heat transfer tubes 1b, a supply manifold 2Ab, a recovery manifold 2Bb, a plurality of supply-side resin fixing portions 3A, and a plurality of recovery-side resin fixing portions 3B. ..

The heat transfer tube 1b is an extruded metal product. As shown in FIG. 14, the heat transfer tube 1b is a flat single-hole tube.
In the fourth embodiment, the heat transfer tube 1b has a tube main body portion 11b, a supply side connection tube portion 12b, and a recovery side connection tube portion 13b.
The pipe body 11 has an internal flow path R11D inside.
Each of the supply side connection pipe portion 12b and the recovery side connection pipe portion 13b has an opening H1D. The opening H1D of the supply side connection pipe portion 12b and the opening H1D of the recovery side connection pipe portion 13b communicate with each other via the internal flow path R11D.

The supply manifold 2Ab has a main pipe portion 21, a plurality of branch pipe portions 22b, a spigot end portion 23, and a receiving port end portion 24. As shown in FIG. 15, the branch pipe portion 22b has a fitting portion 22Fb and a non-fitting portion 22N.

In the fourth embodiment, the fitting portion 22Fb has an overhanging portion 22F4. The overhanging portion 22F4 projects toward the left from the left surface LS22N2 of the non-fitting portion 22N.
The overhanging portion 22F4 has five openings H2D. The five openings H2D are formed on the left front end surface LS22. Each of the five openings H2D is arranged in a row along the anteroposterior direction. Each of the five openings H2D communicates with the internal flow path R2 of the main pipe portion 21 via the internal flow path R22 of the branch pipe portion 22b. The shape of the opening H2D seen from the left is an elongated hole.

In the heat exchanger 100b according to the fourth embodiment, the overhanging portion 22F4 is fitted inside the heat transfer tube 1 via the opening H1D of the heat transfer tube 1b.

The overhanging portion 22F4 is fitted inside the heat transfer tube 1b in the heat exchanger 100b via the opening H1D of the heat transfer tube 1b. The overhanging portion 22F4 has an outer peripheral surface CS22F4. The outer peripheral surface CS22F4 of the overhanging portion 22F4 is in contact with the inner peripheral surface IS12D of the supply side connecting pipe portion 12.

(5) Fifth Embodiment Next, with reference to FIGS. 1, 2, 6, 8, 9, 14, and 16, the heat exchanger 100c according to the fifth embodiment of the present disclosure. explain. FIG. 16 is a perspective view showing the appearance of the branch pipe portion 22c of the supply manifold 2Ac according to the fifth embodiment.

In the heat exchanger 100c according to the fifth embodiment, the heat transfer tube 1b is a flat single hole tube, and the fitting portion 22Fc of the supply manifold 2Ac and the recovery manifold 2Bc is composed of a plurality of flat plate portions 22F5. It is different from the heat exchanger 100 according to the first embodiment.

The heat exchanger 100c according to the fifth embodiment includes a plurality of heat transfer tubes 1b, a supply manifold 2Ac, a recovery manifold 2Bc, a plurality of supply-side resin fixing portions 3A, and a plurality of recovery-side resin fixing portions 3B. ..

The supply manifold 2Ac is an integrally resin molded product. The supply manifold 2Ac has a main pipe portion 21, a plurality of branch pipe portions 22c, a spigot end portion 23, and a receiving port end portion 24.
The main pipe portion 21 is an example of the second main body portion of the first manifold. The branch pipe portion 22c is an example of the second connecting pipe portion of the first manifold.

As shown in FIG. 16, each of the plurality of branch pipe portions 22c protrudes to the left from the outer peripheral surface CS21 of the main pipe portion 21. Each of the plurality of branch pipe portions 22c is arranged in a row along the front-rear direction. The main pipe portion 21, the plurality of branch pipe portions 22c, the spigot end portion 23, and the receiving port end portion 24 are integral parts.

The branch pipe portion 22c has a fitting portion 22Fc and a non-fitting portion 22N. The fitted portion 22Fc and the non-fitted portion 22N are integral parts. The fitting portion 22Fc is an example of the fitting portion. The non-fitting portion 22N is an example of the non-fitting portion.

The fitting portion 22Fc has eight flat plate portions 22F5. Each of the eight flat plate portions 22F5 projects to the left from the inside of the non-fitting portion 22N. Each of the eight flat plate portions 22F5 is arranged at a predetermined distance along the front-rear direction so that the main surfaces face each other.
The flat plate portion 22F5 is fitted inside the heat transfer tube 1b in the heat exchanger 100c via the opening H1D (see FIG. 14) of the heat transfer tube 1b. Each of the eight flat plate portions 22F5 has an upper surface TS 22F5 and a lower surface BS 22F5. The upper surface TS22F5 and the lower surface BS22F5 of the flat plate portion 22F5 are in contact with the inner peripheral surface IS12D (see FIG. 14) of the supply side connecting pipe portion 12.

The fitting portion 22Fc has seven openings H2E. Each of the seven openings H2E is configured such that adjacent flat plate portions 22F5 are arranged at predetermined intervals in the front-rear direction. The branch pipe portion 22c has an internal flow path R22 inside. Each of the seven openings H2E communicates with the internal flow path R21 of the main pipe portion 21 via the internal flow path R22 of the branch pipe portion 22c. Therefore, in the heat exchanger 100c, the internal flow path R21 of the main pipe portion 21 communicates with the internal flow path R11D of the heat transfer tube 1b via the internal flow path R22 and the seven openings H2E.

(6) Sixth Embodiment Next, with reference to FIG. 17, the pipe joint structure 500 according to the sixth embodiment of the present disclosure will be described. FIG. 17 is a cross-sectional view of the pipe joint structure 500 according to the sixth embodiment.

In the sixth embodiment, the pipe joint structure 500 is used for the movement of the fluid. The fluid comprises at least one of a gas, a liquid, and a powder. The powder represents an aggregate of fine particles. The gas contains water vapor. The liquid contains water.

As shown in FIG. 17, the pipe joining structure 500 includes a metal pipe 50, a pipe 60, and a resin fixing portion 70.
The metal pipe 50 is an example of the first pipe body. The pipe 60 is an example of the second pipe body.

In the sixth embodiment, the longitudinal direction of the metal pipe 50 will be described as “left-right direction”. Further, in the left-right direction, the pipe 60 side is defined as "right side" and the opposite is defined as "left side" with respect to the metal pipe 50. It should be noted that these orientations do not limit the orientation when the heat exchanger of the present disclosure is used.

The metal pipe 50 is connected to the pipe 60. The resin fixing portion 70 fixes the pipe 60 to the metal pipe 50.
Specifically, as shown in FIG. 17, the metal pipe 50 has a right end surface RS50. The right end surface RS50 of the metal pipe 50 is connected to the pipe 60. The resin fixing portion 70 is formed on the outer peripheral surface CS50 of the metal pipe 50 and the outer peripheral surface CS60 of the pipe 60 so as to cover the entire circumference of the right outer peripheral edge RE50 of the right end surface RS50 of the metal pipe 50. The plurality of metal pipes 50, pipes 60, and resin fixing portions 70 are integrated. The right tip surface RS50 is an example of the tip surface of the first connecting pipe portion. The right outer peripheral edge RE50 is an example of the outer peripheral edge of the tip surface of the first connecting pipe portion.

The metal pipe 50 is a metal pipe, and the shape of the metal pipe 50 is appropriately selected according to the type of fluid and the like, and examples thereof include a round pipe, a square pipe, and a deformed pipe. Examples of the deformed pipe include a flat square pipe, a semicircular pipe, an elliptical pipe and the like.
The metal pipe 50 has a pipe main body 51 and a connecting pipe 52. The pipe main body 51 is an example of the first main body.
The pipe body 51 extends from the connecting pipe 52 to the left. The connecting pipe portion 52 constitutes the right end portion of the pipe main body portion 51.
The pipe body 51 circulates the fluid. The pipe main body 51 has an internal flow path R51 inside. A fluid flows through the internal flow path 51.
The connection pipe portion 52 is a portion for connecting to the pipe 60. The connecting pipe portion 52 has an opening H52. The opening 52 communicates with the internal flow path R51 of the pipe main body 51.
Examples of the material of the metal pipe 50 include the same materials as those exemplified as the material of the heat transfer tube 1. The tube main body 51 is an example of the first main body. The internal flow path R51 is an example of the first internal flow path. The opening 52 is an example of the first opening.

The pipe 60 is a metal or resin pipe. The shape of the pipe 60 is not particularly limited as long as it fits inside the connecting pipe portion 52 of the metal pipe 50.
The pipe 60 has a pipe main body portion 61 and a connecting pipe portion 62. The pipe main body 61 is an example of the second main body.
The pipe body portion 61 extends from the connecting pipe portion 62 in the right direction. The connecting pipe portion 62 constitutes the left end portion of the pipe main body portion 61.
The pipe body 61 circulates the fluid. The pipe body 61 has an internal flow path R61 inside. A fluid flows through the internal flow path R61.
The connection pipe portion 62 is a portion for connecting to the metal pipe 50. The connecting pipe portion 62 has an opening H62. The opening H62 communicates with the internal flow path R61 of the pipe main body 61.
Examples of the material of the pipe 60 include the same materials as those exemplified as the material of the heat transfer tube 1 and the same materials as those exemplified as the resin constituting the supply manifold 2A. The pipe main body 61 is an example of the second main body. The internal flow path R61 is an example of the second internal flow path. The opening H62 is an example of the second opening.

The resin fixing portion 70 is an insert molded product of the resin composition.
The resin fixing portion 70 fixes the pipe 60 to the metal pipe 50.
The resin fixing portion 70 is in contact with the outer peripheral surface CS52 of the connecting pipe portion 52 of the metal pipe 50 and the outer peripheral surface CS60 of the pipe 60. The resin fixing portion 70 covers the entire circumference of the right outer peripheral edge RE50 of the right end surface RS50 of the metal pipe 50.
Hereinafter, among the outer peripheral surface CS52 of the connection pipe portion 52 of the metal pipe 50, the surface in contact with the resin fixing portion 70 may be referred to as a “fixing surface”.
The fixed surface has a roughened surface. In other words, the fixed surface is roughened.
When the material of the pipe 60 is a resin, the resin composition constituting the resin fixing portion 70 is preferably a resin having compatibility with the resin constituting the pipe 60. As a result, the resin fixing portion 70 is fused to the pipe 60.
When the material of the pipe 60 is metal, it is preferable that the surface of the outer peripheral surface CS60 of the pipe 60 that comes into contact with the resin fixing portion 70 has a roughened surface.

The embodiments of the present invention have been described above with reference to the drawings. However, the present invention is not limited to the above embodiment, and can be implemented in various embodiments without departing from the gist thereof. The drawings are schematically shown mainly for each component for easy understanding, and the thickness, length, number, etc. of each of the illustrated components are different from the actual ones for the convenience of drawing creation. .. Further, the material, shape, dimensions, etc. of each component shown in the above embodiment are merely examples, and are not particularly limited, and various changes can be made without substantially deviating from the effects of the present invention. be.

(13.1) Modification 1
In the first to fifth embodiments, as shown in FIG. 7, the outer peripheral edge LE3 of the supply-side resin fixing portion 3A is located on the right side of the outer peripheral edge LE22 of the fitting portion 22F in the left-right direction. The present disclosure is not limited to this. For example, in the left-right direction, the outer peripheral edge LE3 of the supply-side resin fixing portion 3A may be located at the same position as the outer peripheral edge LE22 of the fitting portion 22F, or may be located on the left side. When the outer peripheral edge LE3 is located on the left side of the outer peripheral edge LE22 in the left-right direction, the length in the left-right direction between the outer peripheral edge LE3 and the outer peripheral edge LE22 is transmitted from the viewpoint of ensuring the airtightness of the heat exchanger 100. It is preferably less than or equal to the wall thickness of the heat tube 1.

(13.2) Modification 2
In the first to fifth embodiments, as shown in FIG. 7, the wall thickness of the non-fitting portion 22N is thicker than the wall thickness of the fitting portion 22F, but the present disclosure is not limited to this. The wall thickness of the non-fitting portion 22N may be the same as the wall thickness of the fitting portion 22F, or may be thinner than the wall thickness of the fitting portion 22F.

(13.3) Modification 3
In the first to fifth embodiments, the resin fixing surface FS12 has a roughened surface, but the present disclosure is not limited thereto. The resin fixing surface FS12 does not have to have a roughened surface. Further, the method for manufacturing the heat exchanger 100 does not have to include a roughening step.

(13.4) Modification 4
In the first to fifth embodiments, each of the supply manifold 2A and the recovery manifold 2B is made of resin, but the present disclosure is not limited thereto. At least one of the supply manifold 2A and the recovery manifold 2B may be made of metal.

(13.5) Modification 5
In the first to fifth embodiments, each of the supply manifold 2A and the recovery manifold 2B has a connecting pipe portion 231 and an O-ring 232, but the present disclosure is not limited thereto. Each of the supply manifold 2A and the recovery manifold 2B does not have to have the connecting pipe portion 231 and the O-ring 232.

(13.6) Modification 6
In the first to fifth embodiments, each of the supply manifold 2A and the recovery manifold 2B includes an upper protruding fixing portion 233, a lower protruding fixing portion 234, an upper protruding fixing portion 241 and a lower protruding fixing portion 242. However, this disclosure is not limited to this. Each of the supply manifold 2A and the recovery manifold 2B may not include an upper protruding fixing portion 233, a lower protruding fixing portion 234, an upper protruding fixing portion 241 and a lower protruding fixing portion 242.

(13.7) Modification 7
In the first embodiment and the third to fifth embodiments, the number of heat transfer tubes 1 is 5, but the number of heat transfer tubes 1 is not particularly limited, and even if the number of heat transfer tubes 1 is 1 or more and 4 or less. It may be 6 or more. Further, in the first embodiment and the third to fifth embodiments, the shape of the heat transfer tube 1 is a flat tubular shape, but the shape of the heat transfer tube 1 is not particularly limited, and is a round tube, a square tube, or a modified shape. It may be a tube or the like. Further, air cooling fins may be attached to the outer peripheral surface CS1 of the heat transfer tube 1. In the first embodiment and the third embodiment, the number of partition walls 14 is two, but the number of partition walls 14 may be one or three or more.

(13.8) Modification 8
In the first to fifth embodiments, the cooling medium is used, but the present disclosure is not limited to this. For example, a heating medium may be used as the heat exchange medium. Examples of the heating medium include a heating liquid, a heating gas, and the like. Examples of the heating liquid include water and oil. Examples of the heating gas include air and steam. The temperature of the heating medium is appropriately adjusted according to the type of heating element and the like. When a heating medium is used as the heat exchange medium, the heat exchanger 100 promotes heat storage of an external heating element.

(13.9) Modification 9
In the first to fifth embodiments, the supply manifold 2A and the recovery manifold 2B are integrally resin molded products, but the present disclosure is not limited thereto. At least one of the supply manifold 2A and the recovery manifold 2B may be made of metal. Further, for example, at least one of the supply manifold 2A and the recovery manifold 2B may be an integrally molded product in which the branch pipe portion 22 is made of resin and the other portion is made of metal.

(13.10) Modification 10
In the first to fifth embodiments, each of the supply manifold 2A and the recovery manifold 2B includes an O-ring 232, but a packing may be provided instead of the O-ring 232. Examples of the packing include lip packing, squeeze packing, oil seal, cushion seal, dust seal and the like.

(13.11) Modification 11
In the second embodiment, the number of heat exchanger divided bodies is two, but the number of heat exchanger divided bodies is appropriately selected according to the type of the heat exchanger to be heated, and even if the number is three or more. good.

100 Heat exchanger 1 Heat transfer tube 11 Pipe body 12 Supply side connection pipe 13 Recovery side connection pipe 2A Supply manifold 21 Main pipe 22 Branch pipe 2B Recovery manifold 3A Supply side resin fixing part 3B Recovery side resin fixing part RS1 Right side Tip surface RE1 Outer peripheral edge R11A Rear flow path R11B Central flow path R11C Front flow path R21 Internal flow path RS1 Right tip surface

H1A Rear opening H1B Central opening H1C Front opening H2A opening H2B opening

Claims (13)

A first metal pipe having a first main body portion including a first internal flow path through which a fluid flows, and a first connecting pipe portion including a first opening communicating with the first internal flow path on the tip surface. With the body
A second main body including a second internal flow path through which the fluid flows, and a second opening in the tip surface that communicates with the second internal flow path, and the tip surface side via the first opening. A second pipe body having at least a part of the second connecting pipe portion fitted inside the first connecting pipe portion, and a second pipe body.
It is an insert molded product of the resin composition, and is in contact with at least a part of the outer peripheral surface of each of the first connecting pipe portion and the second connecting pipe portion, and is on the outer peripheral edge of the tip surface of the first connecting pipe portion. A pipe body joining structure including a resin fixing portion for fixing the second connecting pipe portion to the first connecting pipe portion so as to cover the entire circumference. The second connecting pipe portion includes a fitting portion fitted inside the first connecting pipe portion.
In a cross section including the fitting portion cut along a plane orthogonal to the longitudinal direction of the first connecting pipe portion, the ratio of the total area of the fitting portion to the total area of the inner empty area of the first connecting pipe portion is , 30 area% or more and 80 area% or less, according to claim 1. The second connection pipe portion is
The fitting portion fitted inside the first connecting pipe portion and the fitting portion
Including a non-fitting portion that is not fitted inside the first connecting pipe portion,
In the longitudinal direction of the first connecting pipe portion, the outer peripheral edge of the resin fixing portion on the side opposite to the non-fitting portion is closer to the non-fitting portion side than the outer peripheral edge of the tip surface of the fitting portion. The tubular joint structure according to claim 1 or 2, which is located. The second connection pipe portion is
The fitting portion fitted inside the first connecting pipe portion and the fitting portion
Including a non-fitting portion that is not fitted inside the first connecting pipe portion,
The pipe joining structure according to any one of claims 1 to 3, wherein the wall thickness of the non-fitting portion is thicker than the wall thickness of the fitting portion. The pipe joining structure according to any one of claims 1 to 4, wherein the outer peripheral surface of the first connecting pipe portion that comes into contact with the resin fixing portion has a roughened surface. The second connecting pipe portion includes a non-fitting portion that is not fitted inside the first connecting pipe portion.
The second connecting pipe portion is made of resin and is made of resin.
The pipe joining structure according to any one of claims 1 to 5, wherein the non-fitting portion and the resin fixing portion are fused. The tubular body joining structure according to any one of claims 1 to 6 is provided.
The fluid is a heat exchanger, which is a heat exchange medium that exchanges heat with a heat exchanger. The first tube body includes at least one heat transfer tube and contains at least one heat transfer tube.
Each of the at least one heat transfer tubes
The tubular first main body portion that transfers heat of the heat exchange medium to the heat exchanger
It has a pair of the first connecting pipe portions and
The second tubular body includes a first manifold and a second manifold.
The first manifold is
The second main body including the second internal flow path that supplies the heat exchange medium to the first internal flow path, and the second main body portion.
It has the second connecting pipe portion fitted inside one of the pair of first connecting pipe portions, and has the second connecting pipe portion.
The second manifold is
The second main body including the second internal flow path for recovering the heat exchange medium discharged from the first internal flow path, and the second main body portion.
The heat exchanger according to claim 7, further comprising the second connecting pipe portion fitted inside the other of the pair of first connecting pipe portions. The first manifold is
A supply component connecting pipe portion connected to a supply component that supplies the heat exchange medium to the second internal flow path,
It has a first packing for sealing a gap between the supply component connecting pipe portion and the supply component connected to the supply component connecting pipe portion.
The second manifold is
A recovery component connection pipe portion connected to a recovery component that recovers the heat exchange medium discharged from the second internal flow path,
The heat exchanger according to claim 8, further comprising a second packing for sealing a gap between the recovery component connecting pipe portion and the recovery component connected to the recovery component connection pipe portion. Each of the first manifold and the second manifold is made of resin.
The first manifold has a first protruding fixing portion that protrudes from the outer peripheral surface of the second main body portion and for fixing a supply component that supplies the heat exchange medium to the second internal flow path.
The second manifold has a second protruding fixing portion for fixing a recovery component that projects from the outer peripheral surface of the second main body portion and collects the heat exchange medium discharged from the second internal flow path. The heat exchanger according to claim 8 or 9. The first tube body includes a plurality of heat transfer tubes, and the first tube body includes a plurality of heat transfer tubes.
The first manifold includes a plurality of first manifold divided bodies that can be connected to each other.
Each of the plurality of first manifold divided bodies
With at least one of the second connecting pipes,
The first connecting pipe portion for connecting to the other first manifold divided body included in the plurality of first manifold divided bodies is included.
The second manifold includes a plurality of second manifold splits that can be connected to each other.
Each of the plurality of second manifold divided bodies
The second connecting pipe portion paired with the second connecting pipe portion of the first manifold split body,
The heat exchange according to any one of claims 8 to 10, which includes a second connecting pipe portion for connecting to the other second manifold divided body included in the plurality of second manifold divided bodies. vessel. The first preparation step of preparing a metal heat transfer tube having a pair of first connection tube portions, and
A second preparation step of preparing a first manifold having a second connection pipe portion to which one of the pair of first connection pipe portions is fitted.
A third preparation step of preparing a second manifold having a second connecting pipe portion to which the other of the pair of first connecting pipe portions is fitted.
A first fitting step of fitting one of the pair of first connecting pipe portions to the second connecting pipe portion of the first manifold.
A second fitting step of fitting the other of the pair of first connecting pipe portions to the second connecting pipe portion of the second manifold.
After the first fitting step is executed, one of the pair of first connecting pipes and the first of the pair of first connecting pipes so as to cover the entire circumference of the outer peripheral edge of the one end surface of the pair of first connecting pipes. A first insert molding step of forming a resin fixing portion by insert molding on at least a part of each outer peripheral surface of the second connecting pipe portion of the manifold.
After the second fitting step is executed, the other of the pair of first connecting pipes and the second of the pair of first connecting pipes so as to cover the entire circumference of the outer peripheral edge of the other end surface of the pair of first connecting pipes. A method for manufacturing a heat exchanger, comprising a second insert molding step of forming a resin fixing portion by insert molding on at least a part of the outer peripheral surface of each of the second connecting pipe portions of the manifold. The first manifold has a plurality of first manifold divided bodies that can be connected to each other.
Each of the plurality of first manifold divided bodies
With at least one of the second connecting pipes,
It has a first connecting pipe portion for connecting to the other first manifold divided body included in the plurality of first manifold divided bodies.
The second manifold has a plurality of second manifold divided bodies that can be connected to each other.
Each of the plurality of second manifold divided bodies
The second connecting pipe portion paired with the second connecting pipe portion of the first manifold split body,
It has a second connecting pipe portion for connecting to the other second manifold divided body included in the plurality of second manifold divided bodies.
The second preparatory step includes a first connecting step of connecting the first connecting pipe portions of each of the plurality of first manifold divided bodies.
The method for manufacturing a heat exchanger according to claim 12, wherein the third preparation step includes a second connecting step of connecting the second connecting pipe portions of each of the plurality of second manifold divided bodies.

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