WO2021199458A1

WO2021199458A1 - Heat exchanger header, heat exchanger, method for manufacturing heat exchanger header, and method for manufacturing heat exchanger

Info

Publication number: WO2021199458A1
Application number: PCT/JP2020/034629
Authority: WO
Inventors: 大士永友; 寧彦松尾; 優紀大谷; 典宏米田
Original assignee: 三菱電機株式会社
Priority date: 2020-03-31
Filing date: 2020-09-14
Publication date: 2021-10-07
Also published as: DE112020006995T5; JP7361887B2; JPWO2021199458A1

Abstract

This heat exchanger header comprises: a first header member that has a first pipe in which a bypass flow passage for circulating a heat medium is formed, and a pipe forming part which is a portion of a second pipe in which a main flow passage for circulating a heat medium is formed; and a second header member (120) that is joined to the pipe forming part and forms the second pipe together with the pipe forming part. The second header member (120) has a curved section, an insertion hole (50) into which a heat transfer pipe (20) is inserted is formed in the curved section, and the hole wall of the insertion hole (50) extends along the inserted heat transfer pipe (20) over the entire circumference.

Description

Heat exchanger header, heat exchanger, heat exchanger header manufacturing method, and heat exchanger manufacturing method

This disclosure relates to a heat exchanger header, a heat exchanger, a method for manufacturing a heat exchanger header, and a method for manufacturing a heat exchanger.

As a heat exchanger used in air conditioners, refrigerators, etc., a fin tube type heat exchanger is known in which a heat medium is circulated through a heat transfer tube equipped with heat radiation fins to exchange heat. The fin tube type heat exchanger includes a header for a heat exchanger in which a heat medium is distributed and distributed to a plurality of heat transfer tubes.

Patent Document 1 discloses a header for a heat exchanger in which an elongated plate is adjacent to an insertion hole of a heat transfer tube formed by burring. Since this elongated plate can bear a part of the force when the internal pressure acts on the header for the heat exchanger, the stress applied around the insertion hole of the heat transfer tube is suppressed. As a result, the withstand voltage performance of the heat exchanger header can be improved.

Japanese Patent No. 45333374

However, the insertion hole disclosed in Patent Document 1 is formed in a flat portion. Therefore, a configuration for improving the pressure resistance of the header is also provided in the flat portion. On the other hand, when the insertion hole is provided in the curved portion of the header for the heat exchanger, it is difficult to apply the configuration disclosed as it is to Patent Document 1 which is supposed to be provided in the flat portion.

The present disclosure has been made in order to solve the above-mentioned problems, and it is possible to secure the bonding strength with the heat transfer tube bonded to the curved portion, and to improve the withstand voltage performance. It is an object of the present invention to provide a header for a exchanger, a heat exchanger, a method for manufacturing a header for a heat exchanger, and a method for manufacturing a heat exchanger.

The heat exchanger header according to the present disclosure is a pipe forming portion which is a part of a first pipe in which a bypass flow path for circulating a heat medium is formed and a second pipe in which a main flow path for passing a heat medium is formed. A first header member having the above, and a second header member which is joined to the pipe forming portion to form a second pipe together with the pipe forming portion. The second header member has a curved portion, and an insertion hole into which the heat transfer tube is inserted is formed in the curved portion, and the hole wall of the insertion hole is along the heat transfer tube to be inserted over the entire circumference.

According to the present disclosure, the hole wall of the insertion hole formed in the curved portion is formed along the heat transfer tube to be inserted over the entire circumference. As a result, the joint strength with the heat transfer tube joined to the curved portion can be ensured, and the pressure resistance performance can be improved.

Top view of the heat exchanger according to the first embodiment Perspective view of the heat transfer tube according to the first embodiment An exploded perspective view of the heat exchanger header according to the first embodiment. It is a figure which shows the header for a heat exchanger which concerns on Embodiment 1, and is the figure which disassembled the header for a heat exchanger. It is a figure which shows the header for a heat exchanger which concerns on Embodiment 1, and is the sectional view of the header for a heat exchanger. The figure focusing on the insertion hole formed in the 2nd header member seen from the arrow V in FIG. It is a figure of the 2nd header member which concerns on Embodiment 1, and is the cross-sectional view in the cutting line VIA-VIA in FIG. It is a figure of the 2nd header member which concerns on Embodiment 1, and is the cross-sectional view in the cutting line VIB-VIB in FIG. Explanatory drawing which showed the flow of the heat medium in the heat exchanger which concerns on Embodiment 1. It is a figure for demonstrating the manufacturing process of the 2nd header member which concerns on Embodiment 1, and it is explanatory drawing which showed in the order of process. It is a figure for demonstrating the manufacturing process of the 2nd header member which concerns on Embodiment 1, and it is explanatory drawing which showed in the order of process. It is a figure for demonstrating the manufacturing process of the 2nd header member which concerns on Embodiment 1, and is the figure seen from the arrow C in FIG. 8B. An explanatory view showing the steps of manufacturing the second header member according to the first embodiment following from FIGS. 8A and 8A in the order of steps. An explanatory view showing the steps of manufacturing the second header member according to the first embodiment following from FIGS. 8A and 8A in the order of steps. Sectional drawing which showed the state which the heat transfer tube was inserted into the 2nd header member which concerns on Embodiment 1. Front view of the second header member according to the second embodiment focusing on the insertion hole. It is a figure of the 2nd header member which concerns on Embodiment 2, and is the cross-sectional view in the cutting line XIIA-XIIA in FIG. It is a figure of the 2nd header member which concerns on Embodiment 2, and is the cross-sectional view in the cutting line XIIB-XIIB in FIG. Sectional drawing of the 2nd header member which concerns on Embodiment 3. It is a figure of the 2nd header member which concerns on Embodiment 3, and is the figure which showed the state of performing the burring process. Explanatory drawing which showed other example of the process of manufacturing the 2nd header member which concerns on Embodiment 1 in process order Explanatory drawing which showed other example of the process of manufacturing the 2nd header member which concerns on Embodiment 1 in process order

Hereinafter, a method for manufacturing a heat exchanger header, a heat exchanger, a heat exchanger header, and a method for manufacturing a heat exchanger according to a preferred embodiment of the present disclosure will be described with reference to the drawings.

(Embodiment 1)
The heat exchanger 1 according to the first embodiment exchanges heat between the air flowing outside the heat exchanger 1 and the heat medium flowing inside the heat exchanger 1. As shown in FIG. 1, the heat exchanger 1 includes a heat transfer tube 20 that allows a heat medium to flow inside, a heat exchanger header 500 that is connected to the heat transfer tube 20 and allows the heat medium to flow into the heat transfer tube 20, and a heat transfer tube. It includes a heat exchanger header 100 that is connected to 20 and allows the heat medium to flow out from the heat transfer tube 20, a joint tube 130 that allows the heat medium to flow out from the heat exchanger header 100, and heat radiation fins 30 that are attached to the heat transfer tube 20.

As shown in FIG. 2, the heat transfer tube 20 is a piping member having a flat cross section having an arc-shaped short side and a straight long side. That is, the heat transfer tube 20 has a shape in which the semi-cylindrical portion 20b is connected to both sides of the rectangular parallelepiped portion 20a. Further, the heat transfer tube 20 has a flow hole 20c formed inside, and the heat medium is circulated through the flow hole 20c. By forming the heat transfer tube 20 into a flat cross section in this way, it is possible to reduce the ventilation resistance around the heat transfer tube 20 and improve the heat exchange efficiency.

The heat transfer tube 20 is formed by a known processing technique such as extrusion processing or drawing processing. The heat transfer tube 20 is made of an aluminum alloy in which a sacrificial anode layer is formed by spraying zinc on the outer surface. By forming the sacrificial anode layer on the outer surface in this way, it is possible to prevent leakage of the heat medium due to corrosion of the heat transfer tube 20.

One end of the heat transfer tube 20 is inserted into the insertion hole 50 formed in the heat exchanger header 100 shown in FIGS. 1 and 3, and is welded and fixed to the heat exchanger header 100 by brazing. Further, the other end of the heat transfer tube 20 is inserted into the insertion hole 550 formed in the heat exchanger header 500 shown in FIG. 1, and is welded and fixed to the heat exchanger header 500 by brazing.

The heat radiation fin 30 is a flat plate-shaped member for increasing the cooling efficiency by increasing the contact area with air. As shown in FIG. 1, a plurality of heat radiation fins 30 are attached to the heat transfer tube 20. The material of the heat radiating fin 30 is, for example, a clad material in which a brazing material is rolled and joined to the surface of an aluminum plate. The thickness of the heat radiation fin 30 is about 0.09 to 0.2 mm.

As shown in FIG. 1, the heat radiating fin 30 includes a plurality of through holes 30a through which the heat transfer tube 20 is inserted. The through hole 30a is a flat hole or notch through which the flat heat transfer tube 20 can be inserted. A heat transfer tube 20 is inserted into each through hole 30a. Then, the heat radiation fin 30 and the heat transfer tube 20 are joined by brazing the connection portion between the inserted heat transfer tube 20 and the heat transfer fin 30.

As shown in FIG. 1, a plurality of heat radiation fins 30 are attached in the longitudinal direction of the heat transfer tube 20, that is, in the direction in which the heat medium flows.

The

heat exchanger headers

100 and 500 are a pair of piping members for supplying and discharging a heat medium which is a fluid to the heat exchanger 1. A plurality of

insertion holes

50 and 550 are formed in the

heat exchanger headers

100 and 500, respectively. A heat transfer tube 20 is inserted into each of the insertion holes 50 and 550, and the

heat exchanger headers

100 and 500 are connected to the heat transfer tube 20.

As shown in FIGS. 3, 4A and 4B, the heat exchanger header 100 includes a first header member 110, a second header member 120, and a cap 140.

The first header member 110 includes a first pipe 111 on which the bypass flow path Bf is formed and a pipe forming portion 112 that forms the second pipe 150 on which the main flow path Mf is formed together with the second header member 120 to be combined. Have. The first header member 110 is a member made of an aluminum alloy in which the first pipe 111 and the pipe forming portion 112 are integrally formed by extrusion processing. A sacrificial anode layer is formed on the outer surface of the first header member 110 by spraying zinc. This makes it possible to prevent leakage of the heat medium due to corrosion of the heat exchanger header 100.

The first pipe 111 is formed with a through hole 111a having a circular cross section that penetrates in the longitudinal direction. The through hole 111a forms a bypass flow path Bf through which a heat medium flows. Further, as shown in FIG. 3, the first pipe 111 is formed with a joint pipe connecting portion 111b to which the joint pipe 130 described later is connected. The joint pipe connecting portion 111b is a portion cut out from a part of the intermediate portion of the first pipe 111. The joint pipe connecting portion 111b is cut out in a shape and size into which the joint pipe 130 can be inserted.

As shown in FIG. 3, the pipe forming portion 112 forms a part of the main flow path Mf parallel to the bypass flow path Bf. The pipe forming portion 112 is integrally formed with the first pipe 111 over the entire length of the first pipe 111. The cross section of the pipe forming portion 112 has a semicircular shape. Further, as shown in FIGS. 3 and 7, a joint pipe insertion hole 112a is formed in the pipe forming portion 112 at a position corresponding to the joint pipe connecting portion 111b. The hole diameter of the joint pipe insertion hole 112a is equal to or smaller than the outer diameter of the joint pipe 130. Therefore, the joint pipe 130 can be temporarily fixed to the first header member 110 by pushing it into the joint pipe insertion hole 112a and press-fitting it.

Further, as shown in FIG. 3, the joint portion 113 to be joined to the second header member 120 is both edge portions of the pipe forming portion 112, and is formed along the direction in which the main flow path Mf is formed. The joint portion 113 is formed over the entire length of the pipe forming portion 112.

Further, as shown in FIG. 7, the first header member 110 is formed with a bypass hole 110a for communicating the main flow path Mf and the bypass flow path Bf. The bypass hole 110a and the through hole 130a formed in the joint pipe 130, which will be described later, form a bypass circuit for the heat medium flowing out of the joint pipe 130.

As shown in FIGS. 3, 4A and 4B, the second header member 120 has a U-shaped cross section that is joined to the first header member 110 to form a part of the main flow path Mf of the heat exchanger header 100. It is a long member of. That is, the second header member 120 is joined to the pipe forming portion 112 to form the second pipe 150 together with the pipe forming portion 112. The second header member 120 is formed of a clad material obtained by rolling and joining a brazing material to an aluminum plate. As shown in FIG. 4A, the second header member 120 has a semicircular portion 121 having a semicircular cross section and two planar portions 122 connected to the end portions of the semicircular portion 121. There is.

Further, the second header member 120 includes a joint recess 120a as shown in FIGS. 4A and 4B. The joint recess 120a is a recess formed on the inner surface of the second header member 120 having a U-shaped cross section by press working, and is formed over the entire length of the second header member 120 in the longitudinal direction. The joint recesses 120a are formed at two locations on the inner surface of the second header member 120. The joint portion 113 of the first header member 110 fits into the joint recess 120a when the first header member 110 and the second header member 120 are combined. At this time, the tip portion of the planar portion 122 of the second header member 120 protrudes laterally from the joint recess 120a of the first header member 110. The protruding portion of the second header member 120 is crimped, and the first header member 110 and the second header member 120 are temporarily fixed. Then, when the temporarily fixed first header member 110 and the second header member 120 are heated in the heating furnace, the brazing material layer of the second header member 120 is melted, and the first header member 110 and the second header member 120 are melted. 120 is brazed.

Further, as shown in FIG. 3, the second header member 120 is formed with a plurality of insertion holes 50 for attaching the heat transfer tube 20. As shown in FIG. 6B, the insertion hole 50 is formed in the semicircular portion 121 which is an example of the curved portion of the second header member 120. As shown in FIG. 5, the insertion hole 50 is a flat elongated hole that matches the outer shape of the heat transfer tube 20 shown in FIG. 2 when viewed from the front in the direction of the arrow V in FIG. It is along the circumferential direction of the circular portion 121. The insertion hole 50 is divided by a pair of flat walls 50a facing the rectangular parallelepiped portion 20a of the heat transfer tube 20 shown in FIG. 2 and a pair of curved walls 50b facing the semi-cylindrical portion 20b of the heat transfer tube 20 shown in FIG. Has been done.

As shown in FIG. 6A, the flat wall 50a is formed along the heat transfer tube 20 inserted into the insertion hole 50. The direction along the heat transfer tube 20 coincides with the X direction into which the heat transfer tube 20 is inserted. Further, as shown in FIG. 6B, the curved wall 50b is formed along the heat transfer tube 20 inserted into the insertion hole 50. The X direction, which is the direction in which the heat transfer tube 20 is inserted, coincides with the direction in which the heat transfer tube 20 connecting the heat exchanger header 100 on the left side and the heat exchanger header 500 on the right side of FIG. 1 extends.

As shown in FIGS. 3 and 7, the cap 140 has a first convex portion 141 inserted into the main flow path Mf and a second convex portion 142 inserted into the bypass flow path Bf. The caps 140 are attached to both ends of the first header member 110 and the second header member 120 in the longitudinal direction, respectively. As a result, the cap 140 closes the main flow path Mf and the bypass flow path Bf formed in the heat exchanger header 100. The cap 140 is formed of a clad material in which a brazing material is rolled and joined to the surface of an aluminum plate, and is formed by press working.

As shown in FIG. 3, the joint pipe 130 is an L-shaped piping member for discharging the heat medium from the heat exchanger header 100. The joint pipe 130 is inserted into the joint pipe insertion hole 112a formed in the first header member 110. As a result, the inside of the joint pipe 130 communicates with the main flow path Mf. Further, the joint pipe 130 is formed with a through hole 130a for communicating the inside of the joint pipe 130 with the bypass flow path Bf. The through holes 130a are holes that penetrate in the radial direction of the circular cross section of the joint pipe 130, and are formed at two positions of the joint pipe 130 as shown in FIG. 7.

As shown in FIG. 1, the heat exchanger header 500 is connected to an end opposite to the end where the heat transfer tube 20 is connected to the heat exchanger header 100. The basic configuration of the heat exchanger header 500 is the same as that of the heat exchanger header 100, and includes a first header member 510, a second header member 520, and a cap 540.

The heat exchanger header 500 is connected to an inflow pipe (not shown), and distributes the inflowing heat medium to the heat transfer tube 20.

Next, the movement of the heat medium flowing through the heat exchanger 1 will be described with reference to FIG. 7. In FIG. 7, the movement of the heat medium is illustrated by an arrow. The heat medium distributed to the heat transfer tube 20 by the heat exchange header 500 flows into the main flow path Mf of the heat exchanger header 100 as shown by the arrow Y1 after the heat exchange is performed. Of the heat medium that has flowed into the main flow path Mf, a part of the heat medium flows into the joint pipe 130 as shown by the arrow Y2, and the rest flows into the bypass flow path Bf through the bypass hole 110a as shown by the arrow Y3. The heat medium that has flowed into the bypass flow path Bf flows into the joint pipe 130 through the through hole 130a as shown by the arrow Y4. The heat medium that has flowed into the joint pipe 130 is discharged from the joint pipe 130 as shown by the arrow Y5.

By providing the bypass flow path Bf into which the heat transfer tube 20 is not inserted in this way, it is possible to suppress the pressure loss in the header 100 for the heat exchanger and improve the oil return property of the refrigerating machine oil used in the compressor (not shown). Is possible. Further, by similarly providing the bypass flow path Bf in the heat exchanger header 500, the heat medium can flow evenly into the main flow path Mf, and the variation in the amount of the heat medium flowing through each heat transfer tube 20 is eliminated. be able to.

Next, a method of manufacturing the second header member 120 included in the heat exchanger header will be described. First, a plate 200 for manufacturing the second header member 120 is cut from a flat plate made of an aluminum alloy, and a joint recess 120a shown in FIG. 8A is formed by press working. Next, as shown in FIG. 8A, the cut plate 200 is placed on a die (not shown) and punched with an elongated hole-shaped punch 300 whose side surface is curved from the direction perpendicular to the main surface 200a. As a result, as shown in FIG. 8B, a through hole 250 is formed in the plate 200. The through hole 250 is an elongated hole having a flat wall 250a and a curved wall 250b, as shown in FIGS. 8B and 8C. The flat wall 250a and the curved wall 250b of the through hole 250 thus formed are perpendicular to the main surface 200a of the plate 200. After that, the through hole 250 becomes the insertion hole 50 shown in FIG. 5 through a manufacturing process described later.

Next, as shown in FIG. 9A, the plate 200 having the through hole 250 is bent to form a semicircular portion 221 having a semicircular cross section on the plate 200. At this time, the plate 200 is bent by matching the circumferential direction of the semicircular portion 221 with the longitudinal direction of the through hole 250. The bent plate 200 is flat in the direction perpendicular to FIG. 9A and has no bend.

The curved wall 250b, which was perpendicular to the main surface 200a before the plate 200 was bent, is close to vertical even after the plate 200 is bent, without significantly changing the angle with respect to the main surface 200a. The relationship is maintained. Therefore, as shown in FIG. 9A, after the plate 200 is bent, the curved wall 250b inclines inward to narrow the through hole 250 and is not parallel to the X direction. On the other hand, the plate 200 does not have a bend in the direction perpendicular to FIG. 9A as described above. Therefore, after the plate 200 is bent, the flat wall 250a shown in FIG. 9A is parallel to the X direction.

Subsequently, as shown in FIG. 9A, the bent plate 200 is installed on a die (not shown). Then, the punch 301 having a curved side surface is moved in parallel in the X direction to perform a shaving process for scraping off the curved wall 250b. The punch 301 used when performing the shaving process is longer than the punch 300 shown in FIG. 8A, which forms the through hole 250, by the amount of scraping the curved walls 250b on both sides. As a result, as shown in FIG. 9B, the punched portion 210 is removed from the second header member 120, and a curved wall 50b parallel to the X direction is formed. In this way, the hole wall of the insertion hole 50 formed in the second header member 120 can be made parallel in the X direction over the entire circumference. Through such a process, the second header member 120 is manufactured.

As shown in FIG. 10, the heat transfer tube 20 is inserted into the insertion hole 50 formed in the second header member 120. Then, by heating in a heating furnace (not shown), the brazing material is melted from the brazing material layer of the second header member 120, and the heat transfer tube 20 is brazed to the second header member 120.

(effect)
According to the above embodiment, the hole wall of the insertion hole 50 formed in the curved semicircular portion 121 is formed along the entire circumference along the heat transfer tube 20, that is, along the direction in which the heat transfer tube 20 is inserted. Has been done. As a result, as shown in FIG. 10, the joint length L between the second header member 120 and the semi-cylindrical portion 20b of the heat transfer tube 20 can be made longer than the plate thickness t of the second header member 120. In this way, since the joint length L can be lengthened, the joint strength between the second header member 120 and the heat transfer tube 20 can be increased, and the pressure resistance performance can be improved.

Further, as shown in FIG. 10, the distance between the hole wall of the insertion hole 50 and the outer surface of the heat transfer tube 20 can be made constant over the joint length L. Therefore, the cooled and solidified wax can be uniformly formed between the hole wall of the insertion hole 50 and the outer surface of the heat transfer tube 20. As a result, the quality of brazing can be improved, so that the strength of the joint portion can be increased, that is, the pressure resistance performance can be improved.

Further, as shown in FIG. 10, since the distance between the hole wall of the insertion hole 50 and the outer surface of the heat transfer tube 20 can be brought close to each other over the joint length L, the amount of brazing material to be supplied can be reduced. As a result, erosion that tends to occur due to excessive brazing supply can be suppressed, and the quality of brazing can be improved.

Further, a long punch 301 was used in the shaving process of scraping both ends of the insertion hole 50 of the second header member 120 processed into a U shape. As a result, both ends of the insertion hole 50 can be scraped off by punching once with the punch 301, and the manufacturing process can be simplified. Further, since the through hole 250 is formed in the plate 200 in advance, the amount of scraping by the shaving process by the punch 301 can be reduced. As a result, deformation of the second header member 120 having a U-shaped cross section can be suppressed, and the combination with the first header member 110 can be performed with high accuracy.

(Embodiment 2)
Next, the second embodiment will be described. As shown in FIG. 11, the second header member 320 is formed with an insertion hole 350 that matches the outer shape of the heat transfer tube 20 shown in FIG. The insertion hole 350 is a flat elongated hole. The insertion hole 350 has a pair of flat walls 350a facing the rectangular parallelepiped portion 20a of the heat transfer tube 20 shown in FIG. 2 and a pair of curved walls 350b facing the semi-cylindrical portion 20b of the heat transfer tube 20 shown in FIG. doing.

As shown in FIG. 12A, the flat wall 350a is formed along the heat transfer tube 20 inserted into the insertion hole 350. Further, the flat wall 350a is parallel to the X direction, which is the insertion direction of the heat transfer tube 20. Further, as shown in FIG. 12B, the curved wall 350b is formed along the heat transfer tube 20 inserted into the insertion hole 350. Further, the curved wall 350b is parallel to the X direction, which is the insertion direction of the heat transfer tube 20.

Further, as shown in FIG. 11, a cut surface 360 is formed on the outer surface 320a of the second header member 320 along the edge of the insertion hole 350. As shown in FIGS. 12A and 12B, the cut surface 360 connects the hole wall of the insertion hole 350 and the outer surface 320a of the second header member 320. Here, the hole walls of the insertion hole 350 are a flat wall 350a and a curved wall 350b. The cut surface 360 is inclined in a direction in which the insertion hole 350 is enlarged toward the outer surface 320a of the second header member 320.

Next, a method of forming the cut surface 360 on the second header member 320 will be described. First, as shown in FIG. 8B, the step of forming the joint recess 120a and the through hole 250 in the plate 200 for the second header member 320 is the same as that of the above embodiment. Next, the edge of the through hole 250 on one surface of the plate 200 shown in FIG. 8B is chamfered by hitting it with a tool having an inclined surface. It should be noted that one surface of the plate 200 is the surface opposite to the surface on which the joint recess 120a is formed. Subsequently, the plate 200 is bent so that one of the chamfered edges of the through hole 250 faces outward. Finally, similar to the step shown in FIG. 9B, the punch 301 is moved in parallel in the X direction to perform a shaving process for scraping off the curved wall 250b. By the above steps, as shown in FIGS. 12A and 12B, a cut surface 360 can be formed at the edge of the insertion hole 350.

Although it has been explained that the step of chamfering the edge of the insertion hole 350 is performed before the bending process of the plate 200, it may be performed after the bending process of the plate 200. In this case, after bending the plate 200 in which the joint recess 120a and the through hole 250 are formed, the edge portion of the through hole 250 is chamfered, and finally the end portion of the through hole 250 is scraped off by shaving processing.

According to the second embodiment, the cut surface 360 is an inclined surface that expands the insertion hole 350 toward the outer surface 320a of the second header member 320. Therefore, the heat transfer tube 20 can be inserted into the insertion hole 350 by bringing it into contact with the cut surface 360 and sliding it along the cut surface 360. As a result, the heat transfer tube 20 can be easily inserted into the insertion hole 350, and the assembly work can be smoothly performed.

Further, the region between the heat transfer tube 20 inserted into the insertion hole 350 and the cut surface 360 can function as a reservoir for collecting the brazing material overflowing from the joint. As a result, it is possible to prevent the brazing material from flowing out from the joint portion between the second header member 320 and the heat transfer tube 20.

(Embodiment 3)
As shown in FIG. 13A, the second header member 420 according to the third embodiment is formed with flanges 460 at both ends of the insertion hole 450 in the longitudinal direction. The second header member 120 according to the first embodiment does not have such a flange, which is different from the first embodiment. The flange 460 is formed so as to project inside the second header member 420.

The manufacturing method of the second header member 420 according to the third embodiment will be described. First, as shown in FIG. 8B, a joint recess 120a and a through hole 250 are formed in the plate 200 for the second header member 420, and then the plate 200 is bent as shown in FIG. 9A. The steps up to this point are the same as those in the first embodiment. Subsequently, as shown in FIG. 13B, the punch 302 is moved in the X direction, and the curved walls 250b formed at both ends of the through hole 250 are subjected to burring. As a result, as shown in FIG. 13A, the curved wall 450b parallel to the X direction is formed, and the flange 460 extending in the X direction is formed so as to project inward of the second header member 420.

According to the third embodiment, as shown in FIG. 13A, the joint length L1 between the second header member 420 and the semi-cylindrical portion 20b of the heat transfer tube 20 is made longer than the plate thickness t of the second header member 420. Can be done. In addition to this joint length L1, it is possible to secure a joint length L2 corresponding to the length of the flanges 460 formed at both ends of the insertion hole 450 in the longitudinal direction. As a result, the joint strength between the second header member 420 and the heat transfer tube 20 can be increased, and the pressure resistance performance can be improved.

This disclosure is not limited to the above embodiment, and various modifications and applications are possible. In the above embodiment, as shown in FIG. 8A, the through hole 250 is formed before the plate 200 is bent, but the through hole 250 may be formed after the plate 200 is bent. As shown in FIG. 14A, the through hole 250 is formed by pressing the plate 200 in which the joint recess 120a is formed with a punch 303 from a plurality of directions. At this time, the plate 200 is not moved, and the punch 303 is rotated each time the punch is pressed to form the through hole 250 in a plurality of times. Alternatively, as another method, the U-shaped plate 200 may be rotationally moved each time the punch 303 is pressed without rotating the punch 303 to form the through hole 250 in a plurality of times. In this way, the through hole 250 shown in FIG. 14B is formed in the plate 200 formed in a U shape. Subsequently, as shown in FIG. 14B, the punch 301 is moved in parallel in the X direction to scrape off the curved walls 250b formed at both ends of the through hole 250. Thereby, the second header member 120 shown in FIG. 9B in which the curved wall 50b parallel to the X direction is formed can be manufactured.

The punch 303 shown in FIG. 14A for drilling the through hole 250 is smaller than the punch 300 shown in FIG. 8A for drilling the through hole 250 in the flat plate 200. Therefore, the deformation of the plate 200 bent into a U shape can be suppressed.

Further, the heat transfer tubes 20 connected to the

heat exchanger headers

100 and 500 are not limited to those having a flat cross section. For example, a heat transfer tube having another cross-sectional shape such as a circular shape, a square shape, or a triangular shape may be connected to the

heat exchanger headers

100 and 500.

Further, the second header member 120 is a clad material obtained by rolling and joining a brazing material to an aluminum plate, and the heat transfer tube 20 is joined with the brazing material melted from the second header member 120. What kind of joining method is used is arbitrary. Is. For example, the second header member 120 and the heat transfer tube 20 may be brazed using paste brazing, wire brazing, or the like.

Further, the configuration of the joint portion between the first header member 110 and the second header member 120 described above is an example, and other joint portions may be configured. For example, both edges of the first header member 110 and both edges of the second header member 120 may be joined in a butt state.

Further, in the above embodiment, the case where the basic configurations of the heat exchanger header 100 and the heat exchanger header 500, which are a pair of piping members, are the same has been described, but the pair of heat exchanger headers having different basic configurations have been described. May be used.

Further, as described with reference to FIG. 13A, the flange 460 is projected inside the second header member 420 by burring, but the flange may be projected outside the second header member 420.

Further, the processing of scraping off the end portion of the through hole 250 to make it parallel to the X direction and the processing of forming the cut surface 360 at the edge portion of the insertion hole 350 are not limited to the above processing methods, and are known processing. You can choose any of the methods. For example, the end portion of the through hole 250 may be filed along the X direction. Further, the cut surface 360 may be formed by cutting the edge portion of the insertion hole 350 with a file, or may be formed by cutting the corner portion. Further, the insertion hole 50 may be formed in the U-shaped plate 200 by laser machining. As a result, the hole wall can form an insertion hole along the heat transfer tube 20 in the U-shaped plate 200.

Further, although it has been explained that the insertion hole 50 is formed in the semicircular portion 121 having a semicircular cross section in the second header member 120, it may be formed in a portion having another cross-sectional shape. For example, it may be formed in a bow-shaped portion of the second header member 120, or may be formed in a convex portion having a rounded tip.

Although it has been explained that each component of the heat exchanger 1 such as the heat exchanger header 100 and the heat transfer tube 20 is made of aluminum, it may be made of other metals such as stainless steel, steel, and copper.

This disclosure allows for various embodiments and modifications without departing from the broad spirit and scope. Moreover, the above-described embodiment is for explaining the present disclosure, and does not limit the scope of the present disclosure. That is, the scope of the present disclosure is indicated by the claims, not the embodiments. And various modifications made within the scope of the claims and within the equivalent meaning of disclosure are considered to be within the scope of the present disclosure.

This application is based on Japanese Patent Application No. 2020-616786, which was filed on March 31, 2020. The specification, claims, and drawings of Japanese Patent Application No. 2020-616786 are incorporated herein by reference.

1 heat exchanger, 20 heat transfer tube, 20a square body part, 20b semi-cylindrical part, 20c flow hole, 30 heat dissipation fin, 30a through hole, 50 insertion hole, 50a flat wall, 50b curved wall, 100 heat exchanger header, 110 1st header member, 110a bypass hole, 111 1st pipe, 111a through hole, 111b joint pipe connection part, 112 pipe forming part, 112a joint pipe insertion hole, 113 joint part, 120 2nd header member, 120a joint recess, 121 Semi-circular part, 122 flat part, 130 joint pipe, 130a through hole, 140 cap, 141 first convex part, 142 second convex part, 150 second pipe, 200 plate, 200a main surface, 210 punched part, 221 Semi-circular part, 250 through hole, 250a flat wall, 250b curved wall, 300, 301, 302, 303 punch, 320 second header member, 320a outer surface, 350 insertion hole, 350a flat wall, 350b curved wall, 360 cut Surface, 420 second header member, 450 insertion hole, 450b curved wall, 460 flange, 500 heat exchanger header, 510 first header member, 520 second header member, 540 cap, 550 insertion hole.

Claims

A first header member having a first pipe in which a bypass flow path for circulating a heat medium is formed, and a pipe forming portion which is a part of a second pipe in which a main flow path for passing a heat medium is formed.
A second header member that is joined to the pipe forming portion to form the second pipe together with the pipe forming portion is provided.
The second header member has a curved portion, and an insertion hole into which a heat transfer tube is inserted is formed in the curved portion.
The hole wall of the insertion hole is along the heat transfer tube to be inserted all around.
Header for heat exchanger.
The hole wall of the insertion hole is parallel to the insertion direction of the heat transfer tube over the entire circumference.
The header for a heat exchanger according to claim 1.
The edge of the insertion hole on the outer surface of the second header member is chamfered.
The header for a heat exchanger according to claim 1 or 2.
The insertion hole is an elongated hole whose longitudinal direction is along the circumferential direction of the second pipe.
The curved portion has flanges at both ends in the longitudinal direction of the insertion hole along the insertion direction of the heat transfer tube.
The header for a heat exchanger according to any one of claims 1 to 3.
On the inner surface of the second header member to which the pipe forming portion is joined, a recess into which the edge portion of the pipe forming portion is fitted is formed along the main flow path.
The header for a heat exchanger according to any one of claims 1 to 4.
The heat exchanger header according to any one of claims 1 to 5.
With the heat transfer tube inserted into the insertion hole and connected to the main flow path,
With fins attached to the heat transfer tube,
Heat exchanger.
The heat transfer tube is joined to the heat exchanger header in a state of being inserted into the insertion hole.
At both ends of the insertion hole in the circumferential direction of the second pipe, the length of the portion where the hole wall of the insertion hole and the outer surface of the heat transfer tube are joined is the length along the heat transfer tube of the second header. Longer than the plate thickness of the member,
The heat exchanger according to claim 6.
At both ends of the insertion hole in the circumferential direction of the second pipe, the distance between the hole wall of the insertion hole and the outer surface of the heat transfer tube is constant in the direction along the heat transfer tube.
The heat exchanger according to claim 6 or 7.
The process of forming an insertion hole into the second header member into which the heat transfer tube is inserted, and
The step of bending the second header member in which the insertion hole is formed, and
A step of processing a portion of the hole wall of the insertion hole that is not along the insertion direction of the heat transfer tube so that the portion is along the insertion direction of the heat transfer tube.
A step of joining the second header member with the processed hole wall and the first header member to form a flow path through which a heat medium flows is provided.
How to manufacture headers for heat exchangers.
The process of bending the second header member and
A step of forming a insertion hole into which a heat transfer tube is inserted by making holes in the bent second header member a plurality of times.
A step of processing a portion of the hole wall of the insertion hole that is not along the insertion direction of the heat transfer tube so that the portion is along the insertion direction of the heat transfer tube.
A step of joining the second header member with the processed hole wall and the first header member to form a flow path through which a heat medium flows is provided.
How to manufacture headers for heat exchangers.
The processing performed on the hole wall is a shaving processing for scraping off a portion not along the insertion direction of the heat transfer tube.
The method for manufacturing a header for a heat exchanger according to claim 9 or 10.
The processing performed on the hole wall is a burring processing for forming a flange in the insertion direction of the heat transfer tube.
The method for manufacturing a header for a heat exchanger according to claim 9 or 10.
By processing the hole wall, the hole wall is made parallel to the insertion direction of the heat transfer tube over the entire circumference.
The method for manufacturing a header for a heat exchanger according to any one of claims 9 to 12.
A step of forming a recess along the longitudinal direction of the second header member is further provided.
By the step of bending the second header member, the recess is arranged on the inner side surface of the curved second header member.
When joining the second header member and the first header member, the second header member and the first header member are temporarily fixed in a state where the edge portion of the first header member is fitted in the recess.
The method for manufacturing a header for a heat exchanger according to any one of claims 9 to 13.
Each step included in the method for manufacturing a header for a heat exchanger according to any one of claims 9 to 14.
The process of inserting a heat transfer tube into the through hole formed in the fin,
A step of inserting the heat transfer tube into the insertion hole formed in the second header member and connecting the heat transfer tube to the flow path through which the heat medium flows.
It comprises a step of heating and joining the assembled second header member, the heat transfer tube, and the fins.
How to manufacture a heat exchanger.
At both ends of the insertion hole in the circumferential direction of the second header member, the length of the portion where the hole wall of the insertion hole and the outer surface of the heat transfer tube are joined is the length along the heat transfer tube of the second. Longer than the plate thickness of the header member,
The method for manufacturing a heat exchanger according to claim 15.
At both ends of the insertion hole in the circumferential direction of the second header member, the distance between the hole wall of the insertion hole and the outer surface of the heat transfer tube is constant in the direction along the heat transfer tube.
The method for manufacturing a heat exchanger according to claim 15 or 16.