JP5167210B2 - Joint structure and its construction method - Google Patents

Description

  The present invention relates to a joint structure for connecting a heat transfer tube housed in a case of a heat exchanger to a connecting tube for circulating a fluid between the heat transfer tube.

  In the heat exchanger, the external fluid introduced from outside the case passes through a housing space in which a heat exchange tube for heat exchange wound in a spiral shape is housed, and then is discharged outside the case. Exchanges heat with the internal fluid in the tube. The heat transfer tube in this heat exchanger is connected to a connecting tube for circulating an internal fluid between the heat transfer tube after the end of the heat transfer tube is inserted into the case side plate (Patent Document) 1).

  The joint (headers 6A, 6B) structure here has an outer periphery of a region where the connecting pipe (openings 60A, 60B) is connected to the first member formed of the side wall surrounding the end of the heat transfer pipe inserted through the case side plate. This is realized by fitting the raised second member so that the end of the rising part faces the case.

JP 2008-032252 A

In the joint structure as described above, after welding the first member and the end of the heat transfer tube inserted through the case side plate, the second member is welded to the end of the side wall of the first member. .
At this time, since the welded portion between the first member and the heat transfer tube has a complicated shape for welding the end portions of the heat transfer tube, welding by so-called brazing is performed, and the first member and the second heat transfer tube are welded. As for the welded portion with the member, one end portion is hidden behind the other end portion, and in order to carry out hermetic welding appropriately, welding by brazing is also performed.

  Here, although welding by brazing is suitable for welding at the above-mentioned welding locations, there is a concern that the deterioration of the material will progress by being carried out in a furnace that is a high-temperature environment, and multiple times will be performed. It is not suitable for carrying out welding work separately. Therefore, usually, a welding operation is simultaneously performed for the plurality of welding locations.

  However, since the welding operation is simultaneously performed at this time, the quality of the welded state between the first member and the end of the heat transfer tube or the welded portion between the first member and the second member is confirmed and the other Even if one of them is in an inappropriate welding state, due to the nature of the welding operation by brazing, the members are separated after both welding operations and the welding operation is repeated. It is also difficult. As a result, the conventional joint structure has a problem that the defect rate tends to be high throughout the manufacturing process.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a technique for reducing the defect rate throughout the manufacturing process.

The first configuration for solving the above problems, the introduced external fluid from outside of the case, through the housing space heat transfer tube for heat exchange is housed be discharged out of the case from within the casing Then, for a heat exchanger that performs heat exchange between the external fluid and the internal fluid that circulates in the heat transfer tube, an end portion of the heat transfer tube inserted through the case side plate of the heat exchanger is connected to the heat transfer tube. It is a joint structure for connecting to the connecting pipe which distribute | circulates the said internal fluid between.

  The joint structure includes a first hole forming portion formed with a hole through which an end portion of the heat transfer tube is inserted, and a side wall surrounding the end portion of the heat transfer tube inserted through the first hole forming portion. 1 member, the 2nd hole formation part which forms the hole where the above-mentioned connecting pipe is inserted, and the 2nd member which has the rise part where the peripheral part stood up, and the 1st member The second member is welded to the end portion of the heat transfer tube inserted through the hole of the first hole forming portion, and the second member has the end portion of the rising portion facing outward of the case. The end portion of the rising portion is welded to the end portion of the side wall of the first member in the fitted state.

  With the joint structure configured as described above, the first member and the second member are fitted so that the end of the side wall of the first member and the end of the rising portion of the second member face the outside of the case. By combining, at least each of the first member and the second member is in a state where a certain region extending toward the outside of the case is overlapped, and this region can be used as a welding location of both members.

  Thus, since the overlapping region in the first member and the second member can be used as a welding location, the welded state was confirmed after welding the first member and the end of the heat transfer tube by brazing in the furnace. In addition, the overlapping portion of the first member and the second member can be welded by argon welding (so-called TIG welding).

  That is, if it is the said structure, after welding with a 1st member and a heat exchanger tube, the suitability of the welding state will be confirmed, and only when it is confirmed that it is welded appropriately, the 1st member and It is possible to construct a joint structure by performing welding with the second member.

  As a result, when the first member and the heat transfer tube are not properly welded, the first member and the second member are not welded. As a result, unnecessary welding work can be eliminated. Therefore, it is possible to prevent an inappropriate joint structure from being constructed in advance.

  Furthermore, the contact area between the end of the side wall of the first member and the rising portion of the second member is sufficiently secured due to the structure in which the constant regions extending outward from the case overlap in each of the first member and the second member. In addition, since both members can be brought into close contact with each other by further expanding the tube, it is easy to maintain the fitted state of both members even before welding. As a result, even during the welding operation of both members, the position of the second member is less likely to be displaced than in the conventional joint structure, so that the welding operation can be easily performed in a stable state.

  And since the 1st member and the 2nd member each overlap the fixed area | region extended toward the case outward, even if the overlap area | region was welded by argon welding, an internal fluid distribute | circulates the welding location. Since it is not a region, it is possible to prevent alteration and breakage of the joint structure.

  In the above configuration, the second member is located inside the end of the side wall of the first member so that the end of the side wall of the first member and the end of the rising portion of the second member face the outside of the case. What is necessary is just to fit, and it does not specifically limit about the specific shape of both members.

For example, as in the second configuration, the first member, the end portion side of the side wall, is substantially L-shaped flange portion for the cross-sectional shape along the extending direction of the side wall and substantially L-shaped It can be considered that the second member has an outer diameter shape that fits inside the substantially L-shaped flange portion.

  With this configuration, by fitting the second member to the substantially L-shaped flange portion of the first member, a state in which the constant regions extending toward the outside of the case are superimposed on each of the first member and the second member, can do. In particular, since the second member is restricted from being displaced to the case side along the side wall of the first member by being fitted to the substantially L-shaped flange portion of the first member, the fitting of both the members is further performed. The state is easily maintained, and the welding operation can be easily performed in a more stable state.

The third configuration for solving the above-discharge the external fluid introduced from outside the case, outside the case from the through housing space heat transfer tube for heat exchange is housed within said case Thus, with respect to the heat exchanger that performs heat exchange between the external fluid and the internal fluid that flows through the heat transfer tube, the end of the heat transfer tube inserted through the case side plate of the heat exchanger is connected to the heat transfer tube. It is a joint structure for connecting to the connecting pipe which distribute | circulates the said internal fluid between heat pipes.

  The joint structure includes a first hole forming portion formed with a hole through which an end portion of the heat transfer tube is inserted, a side wall surrounding the end portion of the heat transfer tube inserted through the first hole forming portion, and the side wall A first member having a flange portion formed on an end side of the first member, and a second member having a second hole forming portion formed with a hole through which the connecting pipe is inserted. Is an end of the heat transfer tube that is disposed so that the opening on the end side where the flange portion is formed on the side wall faces the outside of the case, and is inserted into the hole of the first hole forming portion. The second member is disposed so that a peripheral portion of the second member overlaps with the flange portion formed on the first member, and the first member is disposed at the overlapping portion. And are welded.

  In the joint structure configured as described above, at least the first member and the second member are disposed so that the flange portion of the first member and the peripheral portion of the second member overlap each other. In each of the member and the second member, a certain region extending along the flange portion is superposed, and this region can be used as a welding location of both members.

  Thus, since the overlapping region in the first member and the second member can be used as the welding location, after the first member and the end of the heat transfer tube are welded by brazing in the furnace, as described above. It is possible to confirm the suitability of the welding state and to construct the joint structure by welding the first member and the second member only when it is confirmed that the welding is properly performed.

  As a result, even when the first member and the heat transfer tube are not properly welded, the first member and the second member are not welded. As a result, unnecessary welding work can be eliminated. In addition, it is possible to prevent an inappropriate joint structure from being constructed in advance.

  Further, since the first member and the second member are overlapped with a certain region extending along the flange portion, even if the overlap region is welded by argon welding, the welded portion is a region through which the internal fluid flows. Therefore, alteration and breakage of the joint structure can be prevented.

Moreover, in each said structure, although it is assumed that the welding location of a heat exchanger tube and a 1st member and the welding location of a case side plate and a heat exchanger tube are each welded separately, a 1st member, a heat exchanger tube, and It is good also as welding a case side plate at once. As a structure for this, for example, it is conceivable to fourth as configuration shown below.

  In this configuration, the case side plate is formed with a burring hole having a rising portion that rises outward from the case, and an end portion of the heat transfer tube is inserted through the case side plate through the burring hole. And the first member is formed by inserting the rising portion of the case side plate and the end of the heat transfer tube inserted through the burring hole into the hole of the first hole forming portion. And the rising portion of the case side plate and the end of the heat transfer tube are welded.

  With this configuration, the rising portion of the burring hole formed in the case side plate can be inserted into the hole of the first hole forming portion of the first member and reach the welding location between the first member and the heat transfer tube. For this reason, this welding location can be used not only as a welding location between the first member and the heat transfer tube but also as a welding location with the rising portion of the case side plate. Thereby, a 1st member, a heat exchanger tube, and a case side board can be welded at once.

  Further, in this way, the welded portion of the first member, the heat transfer tube, and the case side plate is in a state in which the rising portion of the burring hole surrounds the heat transfer tube and the hole of the first hole forming portion is disposed outside thereof. . In this state, the first member, the heat transfer tube, and the case side plate are welded by brazing from the opening side facing the first hole forming portion, and the heat transfer tube and the rising portion of the burring hole are connected. Since the molten brazing material can be infiltrated and joined to both the gap and the rising portion of the burring hole and the hole of the first hole forming portion of the first member, welding from the inside of the case is performed. Even if it is not, welding of each member is realizable.

The first way to solve the above problems, an external fluid introduced from the outside of the case, since through the accommodation space heat transfer tube for heat exchange is housed within the casing to the outside of said case With respect to the heat exchanger that performs heat exchange between the external fluid and the internal fluid that circulates in the heat transfer tube by discharging, the end portion of the heat transfer tube inserted through the case side plate of the heat exchanger is It is the construction method of the joint structure connected to the connection pipe | tube which distribute | circulates the said internal fluid between heat transfer pipes.

  In this construction method, a first hole forming portion formed with a hole through which an end portion of the heat transfer tube is inserted, and a side wall surrounding the end portion of the heat transfer tube inserted through the first hole forming portion are provided. For the first member, a first attachment procedure for inserting an end portion of the heat transfer tube inserted through the case side plate into the hole of the first hole forming portion, the first hole forming portion of the first member, and the A first welding procedure for welding the end portions of the heat transfer tubes, a second hole forming portion in which a hole is formed, and a second member having a rising portion formed by raising the outer periphery of the second hole forming portion, A second attachment procedure for fitting the end of the rising portion of the second member inside the end of the side wall of the first member so that the end of the rising portion faces outward of the case; and an end of the side of the first member And a second welding procedure for welding the rising end of the second member. To build the structure.

This method is suitable for constructing the joint structure in the first configuration.
Further, in this method, the first member is formed with a substantially L-shaped flange portion having a substantially L-shaped cross section along the extending direction of the side wall on the end side of the side wall. , may the second member, in the case has a outer shape that fits into the substantially L-shaped flange portion inwardly, so that the second way described below.

In this method, in the second attachment procedure, the second member is fitted inside the substantially L-shaped flange portion of the first member.
This method is suitable for constructing the joint structure in the first and second configurations.

The third way for solving the above problems, an external fluid introduced from the outside of the case, since through the accommodation space heat transfer tube for heat exchange is housed within the casing to the outside of said case With respect to the heat exchanger that performs heat exchange between the external fluid and the internal fluid that circulates in the heat transfer tube by discharging, the end portion of the heat transfer tube inserted through the case side plate of the heat exchanger is It is the construction method of the joint structure for connecting to the connecting pipe which distribute | circulates the said internal fluid between heat transfer pipes.

  In this construction method, a first hole forming portion formed with a hole through which an end portion of the heat transfer tube is inserted, a side wall surrounding the end portion of the heat transfer tube inserted through the first hole forming portion, and the For the first member having a flange portion formed on the end side of the side wall, the opening on the end side where the flange portion is formed on the side wall is disposed so as to face outward of the case, and A first attachment procedure for inserting an end portion of the heat transfer tube inserted through the case side plate into the hole of the first hole forming portion, and the heat transfer tube having the first member inserted through the first hole forming portion. And a second member having a second hole forming part formed with a hole through which the connecting pipe is inserted, and a peripheral part of the second member is the first member. A second attachment procedure disposed so as to overlap with the flange portion formed in A second welding procedure for welding the overlapped portions of the periphery of the flange portion of the first member second member, by constructing the catch structure.

This method is suitable for constructing the joint structure in the third configuration.
In each of the above method, the casing side plates, if the burring hole having upstanding rising portion toward the case outside is formed, it may be like the fourth way described below.

  In this method, in the first mounting procedure, the rising portion of the case side plate and the end portion of the heat transfer tube inserted through the burring hole are inserted into the hole of the first hole forming portion of the first member. In the first welding procedure, the first hole forming portion of the first member, the rising portion of the case side plate, and the end portion of the heat transfer tube are welded.

  This method is suitable for constructing the joint structure in the fourth configuration.

The perspective view which shows the structure of a heat exchanger Side view showing the configuration of the heat exchanger Sectional drawing of the principal part which shows the joint structure in 1st Embodiment Sectional drawing of the principal part which shows the joint structure in 2nd Embodiment

Embodiments of the present invention will be described below with reference to the drawings.
(1) First Embodiment (1-1) Overall Configuration As shown in FIGS. 1 and 2, the heat exchanger 1 is configured to transfer an external fluid introduced from outside the case 2 for heat exchange within the case 2. The heat pipe 3 is used for exchanging heat between the external fluid and the internal fluid flowing through the heat transfer tube 3 by discharging the heat tube 3 from the housing space to the outside of the case 2.

  The heat transfer tube 3 in the heat exchanger 1 is inserted into the side plate of the case 2 and connected to the communication tube 4 that circulates the internal fluid between the heat transfer tube 3 and the heat transfer tube 3 and the communication tube. The joint structure with 4 is realized by using the first member 10 and the second member 20 as shown in FIG. In the present embodiment, the plurality of heat transfer tubes 3 are accommodated in the case 2, and the introduction fluid is introduced into each of the plurality of heat transfer tubes 3, and the internal fluid is discharged from each of the plurality of heat transfer tubes 3. A joint structure is constructed in each of the discharge areas.

  First, the first member 10 includes a first hole forming portion 12 formed with a plurality of holes through which the end portions of the heat transfer tube 3 are inserted, and the heat transfer tube 3 inserted through the holes of the first hole forming portion 12. And a side wall 14 provided so as to surround the end portion of the.

  Among these, the 1st hole formation part 12 is a plate-shaped member which has an area sufficient to include each of the said introduction area | region and discharge area | region in a case 2 side plate, and makes the end part of the heat exchanger tube 3 into a case 2 side plate. A plurality of insertion holes for forming the insertion region and the introduction region and the discharge region are formed.

  The side wall 14 is a plate-like wall extending in a direction away from the case 2 with respect to the first hole forming portion 12, and the end of the heat transfer tube 3 is the first hole forming portion as the extending amount. A distance longer than the distance protruding from 12 is secured. In the end portion of the side wall 14 (the region on the right end portion side in FIG. 3A; the same applies hereinafter), a substantially L-shaped flange whose cross-sectional shape along the extending direction of the side wall 14 is substantially L-shaped. A portion 16 is formed, and the second member 20 is fitted inside the substantially L-shaped flange portion 16.

The first member 10 having such a configuration is attached to the case 2 side plate with the end portion of the side wall 14 facing the outside of the case 2 in a direction away from the case 2 side plate.
Here, as shown in FIG. 3B, a burring hole having a rising portion 5 rising outward from the case 2 is formed in the case 2 side plate, and the end portion of the heat transfer tube 3 is The case 2 side plate is inserted through a burring hole. And the 1st member 10 is the 1st hole in the state by which the edge part of the heat transfer tube 3 penetrated by the standing part 5 of the case 2 side plate and the burring hole was penetrated by the hole of the 1st hole formation part 12. The forming portion 12 is welded to the rising portion 5 of the case 2 side plate and the end portion of the heat transfer tube 3.

  At this time, the rising portion 5 of the burring hole formed in the case 2 side plate is inserted into the hole of the first hole forming portion 12 in the first member 10, and the welded portion between the first hole forming portion 12 and the heat transfer tube 3. The heat transfer tube 3, the first member 10, and the case 2 side plate can be welded at a time by setting this as the welding location. In addition, welding by what is called brazing is employ | adopted for these welding.

On the other hand, as shown in FIG. 3A, the second member 20 has a second hole forming part 22 formed with a hole through which the connecting pipe 4 is inserted, and a rising part 24 whose outer peripheral part rises. .
Among these, the 2nd hole formation part 22 is a plate-shaped member which has the area fitted inside the substantially L-shaped flange part 16 of the 1st member 10, and the hole for penetrating the connecting pipe 4 is formed. Has been.

  Further, the rising portion 24 extends the outer peripheral portion of the second hole forming portion 22 away from the case 2 with the second hole forming portion 22 as a reference, and is integrated with the second hole forming portion 22. Is formed.

  The outer diameter shapes of the second hole forming portion 22 and the rising portion 24 are extended at the second hole forming portion 22 and the rising portion 24 so as to fit inside the substantially L-shaped flange portion 16 of the first member 10. The angle with the direction, the radius of curvature of the curved surface formed at the joint portion of both portions, and the like are adjusted.

  The second member 20 having such a configuration is such that the end portion of the rising portion 24 with respect to the second hole forming portion 22 (the region on the right end side in FIG. 3; the same applies hereinafter) faces the outside of the case 2. Thus, the first member 10 is attached to the first member 10 by being fitted inside the substantially L-shaped flange portion 16.

As described above, by fitting the second member 20 to the substantially L-shaped flange portion 16 of the first member 10, a constant region extending outward from the case is superimposed on each of the first member 10 and the second member 20. Thus, the second member 20 is attached to the first member 10 by welding the overlapping ends. Note that argon welding (so-called TIG welding) is employed for the welding here.
(1-2) Action and Effect With the joint structure configured as described above, the end portion of the side wall 14 of the first member 10 and the end portion of the rising portion 24 of the second member 20 face outward of the case 2. As described above, by fitting the first member and the second member 20, at least the first member 10 and the second member 20 are overlapped with a certain region extending outward from the case 2, and this region is overlapped. It can be set as the welding location of both members.

  Thus, since the overlapping region in the first member 10 and the second member 20 can be used as a welding location, after welding the end portions of the first member 10 and the heat transfer tube 3 by brazing, the welding state is set. After confirming, the welding location of the first member 10 and the second member 20 can be welded without affecting the joint structure even if the materials of the first member 10 and the second member 20 are melted by argon welding. it can.

  That is, in the above embodiment, after welding the first member 10 and the heat transfer tube 3, the suitability of the welding state is confirmed, and only when it is confirmed that the welding is properly performed, It is possible to construct a joint structure by welding the first member 10 and the second member 20.

  As a result, even if the first member 10 and the heat transfer tube 3 are not properly welded, the first member 10 and the second member 20 are not welded. As a result, unnecessary welding work is eliminated. In addition, it is possible to prevent an inappropriate joint structure from being constructed in advance.

  Further, the first member 10 and the second member 20 each have a structure in which a certain region extending outward from the case 2 overlaps, and therefore, the end portion of the side wall 14 in the first member 10 and the rising portion 24 in the second member 20 The contact area of the two members can be sufficiently secured, and the two members can be brought into close contact with each other by further expanding the tube, so that the fitted state of both members can be easily maintained even before welding. Thereby, since the position of the 2nd member 20 becomes difficult to shift | deviate from the conventional joint structure also at the time of welding operation of both members, welding operation can be easily performed in the stable state.

  Since the first member 10 and the second member 20 are overlapped with a certain region extending outward from the case 2, even if the overlap region is welded by argon welding, the welded portion is an internal fluid. Therefore, it is possible to prevent deterioration and breakage of the joint structure.

  Moreover, in the said embodiment, the 2nd member 20 is fitted to the substantially L-shaped flange part 16 in the 1st member 10, and it extends toward the case 2 outward in each of the 1st member 10 and the 2nd member 20. A certain region can be overlaid. In particular, the second member 20 is restricted from being displaced toward the case 2 along the side wall 14 of the first member 10 by being fitted to the substantially L-shaped flange portion 16 of the first member 10. Furthermore, the fitting state of both members is easily maintained, and the welding operation can be easily performed in a more stable state.

  Further, in the above embodiment, the heat transfer tube 3 is inserted into the burring hole formed in the case 2 side plate, and the rising portion 5 of the burring hole is used as the hole of the first hole forming portion 12 in the first member 10. Since it can penetrate and reach the welding location of the 1st member 10 and the heat exchanger tube 3, this welding location is not only the welding location of the 1st member 10 and the heat exchanger tube 3, but the standup part 5 in the case 2 side plate It can be set as the welding location. Thereby, the 1st member 10, the heat exchanger tube 3, and the case 2 side plate can be welded at once.

Further, in this way, the welded portion of the hole of the first hole forming portion 12, the heat transfer tube 3 and the case 2 side plate surrounds the heat transfer tube 3 with the rising portion 5 of the burring hole, and the first member 10 on the outside thereof. It is in the state where the hole of the hole forming part 12 is arranged. In this state, the heat transfer tube 3 and the rising portion 5 of the burring hole are simply welded to the first member, the heat transfer tube, and the case side plate by brazing from the opening side facing the first hole forming portion. 3 and between the rising portion 5 of the burring hole and the hole of the first hole forming portion 12 of the first member 10, the molten brazing material can be infiltrated and joined (FIG. 3). (See (b)), welding of each member can be realized without performing welding from the inside of the case 2.
(1-3) Modifications Embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and may take various forms as long as they belong to the technical scope of the present invention. Needless to say, you get.

  For example, in the said embodiment, the substantially L-shaped flange part 16 is formed in the edge part of the 1st member 10, and the 2nd member 20 is comprised so that it may fit inside. If the substantially L-shaped flange portion 16 is composed of a portion extending in a direction intersecting the extending direction of the side wall 14 and a portion that produces an effect along the extending direction of the side wall 14 from this portion. Well, the length of each part, the angle between the two parts, etc. are not particularly limited.

Moreover, in the said embodiment, the substantially L-shaped flange part 16 is formed in the edge part of the 1st member 10, and the 2nd member 20 is comprised so that it may fit inside. However, if the second member 20 is configured to be fitted to the end of the first member 10, the substantially L-shaped flange portion 16 is not formed on the first member 10, and only the side wall 14 extends. The second member 20 may be fitted inside the side wall 14.
(2) Second Embodiment (2-1) Overall Configuration Since the joint structure in the present embodiment is only different in part in the above embodiment, only the differences will be described in detail.

  The heat exchanger in the present embodiment is identical in that the joint structure of the heat transfer tube 3 and the connecting tube 4 is realized by using the first member 10 and the second member 20, but these first members are the same. 10 and the second member 20 are partially different in configuration.

  First, as shown in FIG. 4, the first member 10 in the present embodiment has a flat flange portion 18 formed at the end portion of the side wall 14, and the end portion side where the flange portion 18 is formed in the side wall 14. The second member 20 is disposed so as to overlap the surface of the flange portion 18. The first member 10 is attached to the case 2 side plate in the same manner as in the first embodiment.

  On the other hand, the second member 20 is configured as a second hole forming portion 22 formed with a hole through which the communication tube 4 is inserted. The second hole forming portion 22 is a flat member having an area larger than the opening on the end portion side where the flange portion 18 is formed in the side wall 14 of the first member 10, and is used for inserting the connecting tube 4. A hole is formed.

  The second member 20 having such a configuration is overlaid on the surface of the flange portion 18 of the first member 10 such that the peripheral portion of the second hole forming portion 22 overlaps the flange portion 18 of the first member 10. Is attached to the first member 10.

Thus, in a state where the flange portion 18 and the second member 20 of the first member 10 are overlapped, a certain region extending along the flange portion 18 in each of the first member 10 and the second member 20 is overlapped. Then, the overlapping area is welded. In addition, argon welding is employ | adopted for the welding here.
(2-2) Action and Effect With the joint structure configured as described above, the first member 10 and the second member are arranged so that the flange portion 18 of the first member 10 and the peripheral portion of the second member 20 overlap each other. 20, at least the first member 10 and the second member 20 are in a state where a certain region extending along the flange portion 18 is overlapped, and this region can be a welded portion of both members.

  Thus, since the area | region which overlaps in the 1st member 10 and the 2nd member 20 can be made into a welding location, after performing the welding with the 1st member 10 and the heat exchanger tube 3 similarly to the above, the welding state It is possible to construct a joint structure by performing welding of the first member 10 and the second member 20 only when it is confirmed that the welding is properly performed.

  As a result, even when the first member 10 and the heat transfer tube 3 are not properly welded, the first member 10 and the second member 20 are not welded. As a result, unnecessary welding work is performed. In addition, it is possible to prevent an inappropriate joint structure from being constructed in advance.

Further, since the first member 10 and the second member 20 overlap each other with a certain region extending along the flange portion 18, even if the overlapping region is welded by argon welding, the welded portion has an internal fluid. Since it is not a circulated region, it is possible to prevent alteration and breakage as a joint structure.
(2-3) Modifications As described above, the second embodiment of the present invention has been described. However, the present invention is not limited to the above-described embodiment, and various forms are possible as long as they belong to the technical scope of the present invention. It goes without saying that it can be taken.

  For example, in the said 2nd Embodiment, the flat flange part 18 is formed in the edge part of the 1st member 10, and the flat 2nd member 20 is arrange | positioned so that the surface may be overlapped. The surface of this flange part 18 and the 2nd member 20 should just be in the relationship arrange | positioned so that both may overlap, and you may comprise each as members other than flat form. For example, it is conceivable that the flange portion 18 and the second member 20, that is, the overlapping portions of the first member 10 and the second member 20, are configured to fit into a concave or convex shape. More specifically, it can be considered that each of the flange portion 18 and the second member 20 is configured by a plate-like member having a shape that becomes concave or convex toward the case 2 toward the outer periphery.

In addition, this structure is employable similarly about the relationship between the substantially L-shaped flange part 16 and the standup | rising part 24 in 1st Embodiment.
Further, the flange portion 18 may be configured as a substantially L-shaped flange similar to the first embodiment, and the flat plate-like second member 20 may be fitted inside the flange portion 18. In this configuration, the second member 20 is arranged so that the partial surface of the flange portion 18 extending in the direction intersecting with the extending direction of the side wall 14 overlaps the second member 20.

  DESCRIPTION OF SYMBOLS 1 ... Heat exchanger, 2 ... Case, 3 ... Heat transfer pipe, 4 ... Connecting pipe, 5 ... Standing part, 10 ... 1st member, 12 ... 1st hole formation part, 14 ... Side wall, 16 ... Substantially L-shaped flange Part, 18 ... flange part, 20 ... second member, 22 ... second hole forming part, 24 ... rising part.

Claims (7)

The external fluid introduced from the outside of the case passes through the housing space in which the heat transfer tube for heat exchange is accommodated in the case and then is discharged to the outside of the case, thereby circulating the external fluid and the inside of the heat transfer tube. With respect to a heat exchanger that performs heat exchange with an internal fluid, an end portion of the heat transfer tube inserted through the case side plate of the heat exchanger is connected to a communication tube that circulates the internal fluid with the heat transfer tube. In the joint structure for connection,
A first member having a first hole forming portion formed with a hole through which an end portion of the heat transfer tube is inserted, and a side wall surrounding the end portion of the heat transfer tube inserted through the first hole forming portion;
A second hole forming part formed with a hole through which the connecting pipe is inserted, and a second member having a rising part with an outer peripheral part rising,
The first member is welded to an end portion of the heat transfer tube inserted through the hole of the first hole forming portion,
The second member is fitted to the end of the side wall of the first member with the end of the rising portion facing outward from the case, and the rising portion is in the fitted state. Is welded to the end of the side wall of the first member ,
The case side plate is formed with a burring hole having a rising portion rising toward the outside of the case, and an end portion of the heat transfer tube is inserted through the case side plate through the burring hole,
In the positional relationship in which the rising portion of the case side plate and the end of the heat transfer tube inserted into the burring hole are inserted into the hole of the first hole forming portion in the first member, the first hole The joint structure , wherein the forming portion, the rising portion of the case side plate, and the end portion of the heat transfer tube are welded . In the first member, a substantially L-shaped flange portion having a substantially L-shaped cross section along the extending direction of the side wall is formed on the end side of the side wall,
The joint structure according to claim 1, wherein the second member has an outer diameter shape that fits inside the substantially L-shaped flange portion. The external fluid introduced from the outside of the case passes through the housing space in which the heat transfer tube for heat exchange is accommodated in the case and then is discharged to the outside of the case, thereby circulating the external fluid and the inside of the heat transfer tube. With respect to a heat exchanger that performs heat exchange with an internal fluid, an end portion of the heat transfer tube inserted through the case side plate of the heat exchanger is connected to a communication tube that circulates the internal fluid with the heat transfer tube. In the joint structure for connection,
A first hole forming portion formed with a hole through which an end of the heat transfer tube is inserted, a side wall surrounding the end of the heat transfer tube inserted through the first hole forming unit, and an end side of the side wall A first member having a formed flange portion;
A second member having a second hole forming part formed with a hole through which the connecting pipe is inserted;
The first member is disposed so that an opening on an end side where the flange portion is formed on the side wall faces the outside of the case, and the first member is inserted through the hole of the first hole forming portion. Welded to the end of the heat pipe,
The second member is disposed so that a peripheral portion of the second member overlaps with the flange portion formed in the first member, and is welded to the first member at the overlapping portion .
The case side plate is formed with a burring hole having a rising portion rising toward the outside of the case, and an end portion of the heat transfer tube is inserted through the case side plate through the burring hole,
In the positional relationship in which the rising portion of the case side plate and the end of the heat transfer tube inserted into the burring hole are inserted into the hole of the first hole forming portion in the first member, the first hole The joint structure , wherein the forming portion, the rising portion of the case side plate, and the end portion of the heat transfer tube are welded . The heat transfer tube is formed with a protrusion protruding in a direction intersecting the length direction of the heat transfer tube in a region located in the case on an end side through which the case side plate is inserted.
The joint structure according to any one of claims 1 to 3, wherein: The external fluid introduced from the outside of the case passes through the housing space in which the heat transfer tube for heat exchange is accommodated in the case and then is discharged to the outside of the case, thereby circulating the external fluid and the inside of the heat transfer tube. With respect to a heat exchanger that performs heat exchange with an internal fluid, an end portion of the heat transfer tube inserted through the case side plate of the heat exchanger is connected to a communication tube that circulates the internal fluid with the heat transfer tube. In the construction method of the joint structure to be connected,
For a first member having a first hole forming portion formed with a hole through which an end portion of the heat transfer tube is inserted, and a side wall surrounding the end portion of the heat transfer tube inserted through the first hole forming portion, A first attachment procedure for inserting the end portion of the heat transfer tube inserted through the case side plate into the hole of the first hole forming portion;
A first welding procedure for welding the first hole forming portion of the first member and an end of the heat transfer tube;
A second member having a second hole forming part in which a hole is formed and a rising part formed by raising an outer periphery of the second hole forming part, and an end of the rising part of the second member is outside the case. A second attachment procedure for fitting inside the end of the side wall of the first member so as to face
While constructing a joint structure by a second welding procedure for welding the end of the side wall of the first member and the end of the rising portion of the second member ,
In the case where a burring hole having a rising portion rising toward the outside of the case is formed in the case side plate,
In the first attachment procedure, the end portion of the heat transfer tube inserted through the rising portion of the case side plate and the burring hole is inserted into the hole of the first hole forming portion of the first member,
In the first welding procedure, the joint structure construction method is characterized in that the first hole forming portion of the first member, the rising portion of the case side plate, and an end portion of the heat transfer tube are welded . The first member is formed with a substantially L-shaped flange portion having a substantially L-shaped cross-sectional shape along the extending direction of the side wall on the end side of the side wall, and the second member is In the case of having an outer diameter shape that fits inside the substantially L-shaped flange portion,
The method for constructing a joint structure according to claim 5, wherein, in the second attachment procedure, the second member is fitted inside the substantially L-shaped flange portion of the first member. The external fluid introduced from the outside of the case passes through the housing space in which the heat transfer tube for heat exchange is accommodated in the case and then is discharged to the outside of the case, thereby circulating the external fluid and the inside of the heat transfer tube. With respect to a heat exchanger that performs heat exchange with an internal fluid, an end portion of the heat transfer tube inserted through the case side plate of the heat exchanger is connected to a communication tube that circulates the internal fluid with the heat transfer tube. In the construction method of the joint structure for connecting,
A first hole forming portion formed with a hole through which an end of the heat transfer tube is inserted, a side wall surrounding the end of the heat transfer tube inserted through the first hole forming unit, and an end side of the side wall The first member having the formed flange portion is disposed such that an opening on the end portion side where the flange portion is formed on the side wall faces the outside of the case, and the first hole forming portion A first attachment procedure for inserting the end portion of the heat transfer tube inserted through the case side plate into the hole;
A first welding procedure for welding the first member to an end of the heat transfer tube inserted through the first hole forming portion;
A second member having a second hole forming portion formed with a hole through which the connecting pipe is inserted, so that a peripheral portion of the second member overlaps with the flange portion formed in the first member. A second mounting procedure for disposing;
While constructing a joint structure by a second welding procedure of welding the overlapping portion of the flange portion of the first member and the peripheral portion of the second member ,
In the case where a burring hole having a rising portion rising toward the outside of the case is formed in the case side plate,
In the first attachment procedure, the end portion of the heat transfer tube inserted through the rising portion of the case side plate and the burring hole is inserted into the hole of the first hole forming portion of the first member,
In the first welding procedure, the joint structure construction method is characterized in that the first hole forming portion of the first member, the rising portion of the case side plate, and an end portion of the heat transfer tube are welded .

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