JP2018091605A - Heat exchanger and method of manufacturing heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger capable of suppressing trouble resulting from tube expansion.SOLUTION: A heat exchanger 1 has a plurality of fins 4, a side plate 3, and an aluminum-made tube 2 inserted into the fins 4 and side plate 3. The tube 2 is expanded with a tube expander to be united with the fins 4 and side plate 3. The tube 2 has a first part 21 formed to a first external diameter d1, a second part 23 formed to a second external diameter d2 larger than the first diameter, and a tapered part 22 connecting the first part 21 and second part 23 together. An outer peripheral surface of the first part 21 is pressed against inner peripheral surfaces of fin holes 42. An outer peripheral surface of the second part 23 is pressed against an inner peripheral surface of an opening part 30. An end of the second part 23 on the side of the tapered part 22 is positioned more inside than an opening end 31. The end of the second part 23 on the side of the tapered part 22 is positioned more outside than a fin hole 42 adjoining the side plate 3.SELECTED DRAWING: Figure 3

Description

  The disclosure in this specification relates to a heat exchanger and a method of manufacturing the heat exchanger.

  Patent Document 1 discloses a heat exchanger and a manufacturing method thereof. The heat exchanger includes a tube, fins, and side plates. In order to manufacture this heat exchanger, first, a side plate and a plurality of fins are arranged at a predetermined interval, and a pipe is inserted through the through holes of the fins and the side plate. And the mandrel which has a pipe expansion billet at the front-end | tip is press-fitted in a pipe from a pipe opening, and a pipe is expanded with a pipe expansion billet over the full length in which a fin exists. By this pipe expansion, the pipe, the fins, and the side plate are integrated.

JP 2009-248138 A

  In the technique disclosed in Patent Document 1, the side plate and the fin are expanded by one expanded billet. In general, since the side plate is thicker than the fin, a large load is applied to the expanded billet passing through the side plate. Thereby, the frictional resistance between the expanded billet and the pipe is increased, and the amount of wear powder generated by the wear in the pipe is increased. If tube expansion is continued in this state, the wear powder adheres to the surface of the tube expansion billet. As a result, there is a problem that the inner surface of the pipe is scraped off by the expanded billet to which the wear powder has adhered. Moreover, since the side plate and the fin are expanded by one expanded billet, there is a problem that the load acting on the tube is increased and the tube is damaged. As described above, the technique of Patent Document 1 has a problem that a problem occurs in the heat exchanger due to the pipe expansion.

  One disclosed object is to provide a heat exchanger and a heat exchanger manufacturing method capable of suppressing problems caused by tube expansion.

  A plurality of aspects disclosed in this specification adopt different technical means to achieve each purpose. In addition, the reference numerals in the parentheses described in the claims and in this section are examples showing the correspondence with the specific means described in the embodiments described later as one aspect, and limit the technical scope. is not.

  One of the disclosed heat exchangers includes a tube (2) formed of an aluminum material and expanded, and a plurality of fins (4) arranged in one direction each having a fin hole (42) through which the tube is inserted. ) And a side plate (3) provided on the outer side of the fin located at the end in one direction among the plurality of fins and having an opening (30) through which the tube is inserted. The tube has a first outer diameter (d1), a first portion (21) closely contacting the inner peripheral surface of the fin hole, a second outer diameter (d2) larger than the first outer diameter, and an opening. A second portion (23) in close contact with the inner peripheral surface of the portion.

  According to this disclosure, in the heat exchanger, the second outer diameter of the second portion that is in close contact with the side plate by the pipe expansion in the pipe is larger than the first outer diameter of the first portion that is in close contact with the fin by the pipe expansion. Is formed. Thereby, when expanding a pipe and fixing with respect to a fin and a side plate, the expansion of a 1st part and the expansion of a 2nd part can each be performed by a separate process. For this reason, the load which acts on a pipe | tube at the time of pipe expansion can be reduced. For this reason, it can suppress that the aluminum powder generated when fixing a pipe and a side plate by pipe expansion adheres to the pipe expansion billet of a pipe expander when fixing a pipe and a fin by pipe expansion. As described above, it is possible to provide a heat exchanger capable of suppressing the problems caused by the pipe expansion.

  One of the disclosed heat exchangers includes a tube (2) formed of an aluminum material and expanded, and a plurality of fins (4) arranged in one direction each having a fin hole (42) through which the tube is inserted. ) And a side plate (3) provided on the outer side of the fin located at the end in one direction among the plurality of fins and having an opening (30) through which the pipe is inserted. The first portion (21) having the first outer diameter (d1) and in close contact with the inner peripheral surface of the fin hole, and the second portion (23) having a second outer diameter (d2) larger than the first outer diameter (23) ) And an intermediate portion (22) that is in close contact with the inner peripheral surface of the opening and connects the first portion and the second portion, and the intermediate portion is in close contact with at least the outer opening end (31) of the opening. doing.

  According to this disclosure, in the heat exchanger, the first portion of the tube is in close contact with the fin, the intermediate portion of the tube is in close contact with the side plate, and the second portion of the tube is located outside the side plate. Therefore, when the pipe is expanded and fixed to the fins and the side plate, the first part and the second part can be expanded in separate steps. For this reason, the load which acts on a pipe | tube at the time of pipe expansion can be reduced. For this reason, it can suppress that the aluminum powder generated when fixing a pipe and a side plate by pipe expansion adheres to the pipe expansion billet of a pipe expander when fixing a pipe and a fin by pipe expansion. As described above, it is possible to provide a heat exchanger capable of suppressing the problems caused by the pipe expansion.

  One of the disclosed methods for manufacturing a heat exchanger includes a tube (2) formed of an aluminum material, a plurality of fins (4) each having a fin hole (42) through which the tube is inserted, and an opening through which the tube is inserted. A side plate (3) having a portion (30), and a heat exchanger manufacturing method comprising a plurality of fins each having a fin hole having a hole inner diameter (df) and larger than the hole inner diameter A side plate having an opening having an opening inner diameter (ds) and a side plate arranged in one direction so that the side plate is arranged on the outermost side, and a tube having an outer diameter (dt) smaller than the inner diameter of the hole After the disposing step (S10) to be inserted into the fin hole and the opening, and the disposing step, the outer diameter of the tube can be expanded to a first outer diameter (d1) that is larger than the inner diameter of the hole and smaller than the inner diameter of the opening. 1 Expander (60), the tube port After (240), after the first tube expansion step (S20) to be inserted into the tube up to the portion inserted through the plurality of fins and the disposing step, the outer diameter of the tube is larger than the inner diameter of the opening inside the tube. A second expander (61) that can be expanded to a second outer diameter (d2) having a size is expanded from the tube mouth portion of the tube so as to expand at least a part of the portion of the tube inserted through the side plate. A second tube expansion step (S30; S330) to be inserted inside.

  According to this disclosure, it is possible to avoid receiving a load from the side plate when the first tube expander passes through the portion of the tube inserted through the side plate. For this reason, while being able to reduce the load which acts on a pipe | tube at the time of pipe expansion, the quantity of the aluminum powder generate | occur | produced compared with the past can be suppressed. Therefore, it can suppress that aluminum powder adheres to the expansion billet of the 1st expansion tube, when the 1st expansion tube passes the part of the pipe penetrated by the fin. Moreover, the 2nd tube expander which receives a load from a side plate does not pass the part which penetrates the fin of a pipe | tube. For this reason, it can avoid that the 2nd tube expander to which the aluminum powder generated by the load from a side plate adhered passes the part penetrated by the fin of the pipe | tube. From the above, it is possible to provide a method of manufacturing a heat exchanger that can suppress problems caused by tube expansion.

  One of the disclosed methods for producing a heat exchanger is a method for producing a heat exchanger comprising a tube (2) made of an aluminum material, a plurality of fins (4), and a side plate (3). A plurality of fins each having a fin hole having a hole inner diameter (df), and a side plate having an opening having an opening inner diameter (ds) larger than the hole inner diameter. Are arranged in one direction so as to be disposed in the tube, and a disposing step (S10) for inserting a tube having a base tube outer diameter (dt) smaller than the hole inner diameter into the fin hole and the opening, and after the disposing step, the tube A first tube expander (60) that can be expanded to a first outer diameter (d1) that is larger than the inner diameter of the hole and smaller than the inner diameter of the opening is connected to a plurality of fins in the tube from the tube opening (240) of the tube. Insert into the pipe up to the part inserted in After the first tube expansion step (S20) and the disposing step, a second tube expander (61) capable of expanding the outer diameter of the tube to a second outer diameter (d2) larger than the inner diameter of the opening is provided. A second tube expanding step (S230; inserting into the tube to a position where the portion of the tube expanded to change from the first outer diameter to the second outer diameter is in close contact with the outer opening end (31) of the opening. S330).

  According to this disclosure, it is possible to avoid receiving a load from the side plate when the first expander is inserted through the portion of the pipe inserted through the side plate. For this reason, the load which acts on a pipe | tube at the time of pipe expansion can be reduced. For this reason, the quantity of the aluminum powder generate | occur | produced compared with the past can be suppressed. Therefore, it can suppress that aluminum powder adheres to the expansion billet of a 1st tube expander, when the 1st tube expands the part of the pipe | tube penetrated by the fin. Moreover, the 2nd tube expander which receives a load from a side plate does not pass the part which penetrates the fin of a pipe | tube. For this reason, it can be avoided that the second tube expander to which the aluminum powder generated by the load from the side plate is attached passes through the portion of the tube inserted through the fin. From the above, it is possible to provide a method of manufacturing a heat exchanger that can suppress problems caused by tube expansion.

It is an external view of the heat exchanger which concerns on 1st Embodiment. It is the arrow view seen from the II direction of FIG. It is sectional drawing which shows the relationship between a side plate and a fin, and a pipe | tube. It is sectional drawing perpendicular | vertical to the pipe-axis direction of a pipe | tube. It is sectional drawing parallel to the pipe-axis direction of a pipe | tube. It is a flowchart which shows the manufacturing method of the heat exchanger of 1st Embodiment. It is a figure which shows the manufacturing process of the heat exchanger of 1st Embodiment. It is a figure which shows the manufacturing process of the heat exchanger of 1st Embodiment. It is a figure which shows the manufacturing process of the heat exchanger of 1st Embodiment. It is a figure which shows the manufacturing process of the heat exchanger of 1st Embodiment. It is a figure which shows the manufacturing process of the heat exchanger of 1st Embodiment. It is a figure which shows the manufacturing process of the heat exchanger of 1st Embodiment. It is a figure which shows the modification 1 of 1st Embodiment. It is a figure which shows the modification 2 of 1st Embodiment. It is a figure which shows the modification 3 of 1st Embodiment. It is sectional drawing which shows the relationship between the side plate in the heat exchanger of 2nd Embodiment, a fin, and a pipe | tube. It is a flowchart which shows the manufacturing method of the heat exchanger of 2nd Embodiment. It is a figure which shows the manufacturing process of the heat exchanger of 2nd Embodiment. It is a figure which shows the manufacturing process of the heat exchanger of 2nd Embodiment. It is a figure which shows the manufacturing process of the heat exchanger of 2nd Embodiment. It is sectional drawing which shows the relationship with the pipe | tube different from FIG. 15 in the heat exchanger of 2nd Embodiment, a side plate, and a fin. It is a figure which shows the modification of the heat exchanger of 2nd Embodiment. It is a flowchart which shows the manufacturing method of the heat exchanger of 3rd Embodiment. It is a figure which shows the manufacturing process of the heat exchanger of 3rd Embodiment. It is a figure which shows the manufacturing process of the heat exchanger of 3rd Embodiment. It is a figure which shows the manufacturing process of the heat exchanger of 3rd Embodiment. It is a figure which shows the manufacturing process of the heat exchanger of 3rd Embodiment.

  A plurality of embodiments will be described below with reference to the drawings. In each embodiment, parts corresponding to those described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. When only a part of the configuration is described in each embodiment, the other modes described above can be applied to the other parts of the configuration. In the following, it is assumed that the side plate 3 is positioned outside the plurality of fins 4 and the plurality of fins 4 are inside the side plate 3.

(First embodiment)
The heat exchanger 1 of the first embodiment will be described with reference to FIGS. 1 to 12. The heat exchanger 1 provides heat exchange between fluids. As shown in FIG. 1, the heat exchanger 1 includes a plurality of fins 4, side plates 3, and aluminum tubes 2 that are inserted through the fins 4 and the side plates 3. For example, as shown in FIG. 2, the heat exchanger 1 has a substantially L shape when viewed in the direction along the fins 4. In the heat exchanger 1, the fins 4 and the side plates 3 are arranged in one direction, the pipe 2 is inserted into the fin hole 42 and the opening 30, the pipe 2 is expanded, and the fin hole 42 and the opening 30 are brought into close contact with each other. It is a manufactured heat exchanger. A plurality of tubes 2 are provided. The pipe 2 is connected to an inlet pipe that introduces fluid, a U-shaped pipe that connects adjacent pipes 2, and an outlet pipe that flows through the pipe 2, thereby forming a flow path through which the fluid flows.

  In the conventional heat exchanger, the tube and the fin hole are closely adhered and the tube and the opening are closely adhered by a tube expansion using a common tube expander. Generally, the tube expander has a tube expansion billet for expanding the tube, and a mandrel for the tube expansion billet to be inserted into the tube with the tube expansion billet provided at the tip. By inserting the tube expander into the tube, the tube is expanded so that the tube is pushed and expanded from the inside by the tube expansion billet, and the expanded tube is in close contact with the fin hole and the opening. In this case, when the tube expander passes through the part inserted into the side plate of the tube, aluminum powder is generated due to wear of the tube due to friction between the tube expanding billet and the tube, and then the tube expander continues to expand the tube. The generated aluminum powder adheres to the surface of the expanded billet in the expanded tube. When aluminum powder adheres to the expanded billet in this way, various problems occur. That is, when the adhesion of the aluminum powder proceeds, the tube expansion load acting on the tube expander increases. As a result, the load required to advance the tube expander increases, and causes an increase in cost in the facility for performing the tube expansion. Furthermore, the problem that the shape of the heat exchanger cannot be formed also occurs because the tube is buckled by the increased tube expansion load.

  In order to reduce the tube expansion load, it is conceivable to perform a special surface treatment on the tube expander, for example, a process for decreasing the frictional resistance of the tube expander such as DLC (Diamond Like Carbon). However, the cost for preparing a tube with a special surface treatment increases. It is also conceivable to reduce the tube expansion load by injecting a large amount of tube expansion oil or using a high viscosity tube expansion oil. However, in such a method, there is a problem that a large-scale degreasing process is required in the process after the pipe expansion.

  As described above, various problems may occur when aluminum powder adheres to the expanded billet. The heat exchanger 1 of 1st Embodiment has the structure which can suppress adhesion of aluminum powder. First, each component of the heat exchanger 1 is demonstrated below.

  The fin 4 includes a plate-like base portion 40 and a collar portion 41 that forms a fin hole 42 through which the tube 2 is inserted. The fin 4 is a plate fin formed of, for example, an aluminum material. Alternatively, the fin 4 may be formed of a metal material other than aluminum. The collar portion 41 includes a bent portion 41a that is bent and extended from the base portion 40 along the tube axis direction, and a flange portion 41b that is formed to spread outward from the bent portion 41a. The collar portion 41 is a portion that forms a fin hole 42 through which the tube 2 is inserted in the fin 4. The inner peripheral surface of the fin hole 42 is in close contact with the outer peripheral surface of the tube 2. The fin 4 is fixed to the tube 2 by this close contact. Therefore, the inner diameter of the fin hole 42 and the first outer diameter d1 that is the outer diameter of the portion inserted through the fin hole 42 of the tube 2 are substantially the same. A plurality of fins 4 are arranged at a predetermined interval in the thickness direction. For example, the fins 4 are arranged so that the flange portions 41 b come into contact with the adjacent fins 4.

  The side plate 3 is a plate-like member made of a metal material. The side plate 3 is formed as an aluminum, copper, or stainless steel plate having a thickness greater than that of the fins 4, for example. The side plate 3 is arrange | positioned outside the fin 4 located in the edge part in the arranged direction among the some fins 4. FIG. In other words, the side plate 3 is disposed outside the fins 4 located at the end portions in the arranged direction among the plurality of fins 4. The side plate 3 is arrange | positioned so that the flange part 41b of the adjacent fin 4 may be contacted, for example. That is, the flange part 41b is an example of a contact part. The side plate 3 is disposed in parallel with the adjacent fins 4. The side plate 3 has an opening 30 through which the tube 2 is inserted. The opening 30 is, for example, a through hole that penetrates the side plate 3 in the thickness direction. The opening 30 has an outer opening end 31, an inner opening end 32, and an inner peripheral surface that connects the opening end 31 and the opening end 32. The opening end 31 is an example of an outer opening end. The inner peripheral surface has a contact surface 30 a that contacts the second portion 23 of the tube 2. The side plate 3 is a support member that supports the tube 2 by being in close contact with the tube 2 of the opening 30.

  The tube 2 is made of an aluminum material. The tube 2 provides a flow path for the heat exchange fluid. As shown in FIGS. 4 and 5, the tube 2 has a plurality of protrusions 26 a that protrude radially inward on the inner peripheral surface. A groove 26b is formed between the plurality of protrusions 26a. The plurality of groove portions 26b are formed at equal intervals in the circumferential direction. The plurality of groove portions 26 b are spiral grooves formed so as to form a spiral along the axial direction of the tube 2. The groove part 26 b promotes heat transfer between the heat exchange fluid and the pipe 2 by generating a turbulent flow in the heat exchange fluid flowing through the inside of the pipe 2, and improves the heat exchange performance of the heat exchanger 1. In the cross-sectional views of the tube 2 shown in FIGS. 3 and 7 to 12, the groove 26b is omitted for simplicity. The pipe 2 transmits the heat of the heat exchange fluid flowing through the inside to the fins 4.

  As shown in FIG. 3, the tube 2 includes a first portion 21 formed at a first outer diameter d1, a second portion 23 formed at a second outer diameter d2 larger than the first outer diameter, A tapered portion 22 that connects the portion 21 and the second portion 23 is provided. The first portion 21 is a portion of the tube 2 that is inserted through the plurality of fins 4. That is, the outer peripheral surface of the first portion 21 is crimped to the inner peripheral surface of the fin hole 42. Therefore, the first outer diameter d1 is substantially the same as the inner diameter of the fin hole 42. The inner diameter of the fin hole 42 can also be expressed as an inner diameter d1. The end portion of the first portion 21 on the taper portion 22 side is located at substantially the same position as the opening end of the opening portion 30 in the tube axis direction. Accordingly, the fin holes 42 of the adjacent fins 4 are prevented from being expanded more than the inner diameter d1. The second portion 23 has a portion that is crimped to the opening 30 of the side plate 3. That is, the outer peripheral surface of the second portion 23 has a portion that is crimped to the contact surface 30a. The end of the second portion 23 on the taper portion 22 side is located closer to the fin 4 than the opening end 31 of the opening 30.

  The end portion of the second portion 23 on the tapered portion 22 side is located outside the fin hole 42 of the fin 4 adjacent to the side plate 3. In the example shown in FIG. 3, the end portion of the second portion 23 on the tapered portion 22 side is located between the opening end 31 and the opening end 32. In other words, the tube 2 is expanded so that the portion from the portion inserted through the opening 30 to the base end of the flare portion 24 has the second outer diameter d2.

  The tube opening portion 240 is a portion that forms the open end of the tube 2. The flare portion 24 is a portion formed in a flare shape whose diameter is larger than that of the second portion 23 toward the tube opening portion 240. The tube port portion 240 is connected to the U-shaped tube. The flare portion 24 has a function of improving connection workability when connecting the tube opening portion 240 and the U-shaped tube. The U-shaped tube connects adjacent tubes 2 and 2. Alternatively, the tube port portion 240 is connected to an inlet tube into which the heat exchange fluid is introduced. Or the pipe opening part 240 is connected with the exit pipe | tube from which the heat exchange fluid which distribute | circulated the pipe | tube 2 flows out. The tube port portion 240 and the U-shaped tube, the inlet tube, and the outlet tube are connected by, for example, brazing.

  The heat exchanger 1 of the first embodiment has a larger area in contact with the inner peripheral surface of the opening 30 in the pipe 2 and the side plate 3 than the heat exchanger 1 of the second embodiment described later. Therefore, the tube 2 and the side plate 3 can be more stably fixed. For this reason, the heat exchanger 1 of 1st Embodiment is suitable for the use in the mounting environment where vibrations, such as a vehicle, are comparatively large.

  The manufacturing method of the heat exchanger 1 of 1st Embodiment is demonstrated with reference to FIGS. As shown in the flowchart of FIG. 6, the heat exchanger 1 is manufactured through an arrangement step S10, a first tube expansion step S20, and a second tube expansion step S30. The heat exchanger 1 is manufactured by expanding a pipe 2 having a raw pipe outer diameter dt that is inserted into the fin 4 and the side plate 3 and crimping the fin 4 and the pipe 2, and the side plate 3 and the pipe 2. When manufacturing the heat exchanger 1, the 1st tube 60 and the 2nd tube 61 are used as a manufacturing apparatus.

  In the disposing step S10, the plurality of fins 4 in which the fin holes 42 having the hole inner diameter df are formed and the side plate 3 in which the opening 30 having the opening inner diameter ds larger than the hole inner diameter df is formed in the thickness direction. Line up. At this time, the plurality of fins 4 are arranged so that the flange portions 41 b of the fins 4 are in contact with the adjacent fins 4. The plurality of fins 4 are arranged so that the protruding direction of the collar portion 41 is the same direction. The side plate 3 is disposed at the end in the aligned direction so that the flange portions 41b of the fins 4 adjacent to the side plate 3 are in contact with each other. At this time, the fin holes 42 of the plurality of fins 4 and the openings 30 of the side plates 3 are arranged so as to be coaxial.

  Next, a pipe having a base pipe outer diameter dt smaller than the hole inner diameter df is inserted through the fin holes 42 of the plurality of fins 4 and the opening 30 of the side plate 3. Accordingly, at this time, the inner peripheral surface of the fin hole 42 and the opening 30 and the outer peripheral surface of the tube 2 are not in close contact with each other. After inserting the tube 2, the process proceeds to the first tube expansion step S20.

  In the first tube expanding step S20, the first tube expander 60 is inserted into the tube 2 from the tube opening portion 240. FIG. 7 is a view showing a state immediately before the first expander 60 is inserted into the pipe 2 arranged in the arrangement step S10. The first tube expander 60 includes, for example, a tube expansion billet having an outer diameter larger than the inner diameter of the tube 2 in the raw tube state, and a mandrel for inserting the tube expansion billet into the tube 2. The first pipe expander 60 is a pipe expander that can expand the pipe 2 by being inserted through the inside of the pipe 2 in a raw pipe state. The first tube 60 can expand the outer diameter of the tube 2 from the raw tube outer diameter dt to the first outer diameter d1 by expanding the tube 2.

  The first tube expander 60 inserted into the tube 2 from the tube port portion 240 moves forward while expanding the tube 2. FIG. 8 is a diagram showing a state of the first tube expander that moves forward while expanding the tube 2. When the first expander 60 passes through the fin hole through the portion where the first expander 60 is inserted into the side plate 3 of the tube 2, the opening inner diameter ds of the opening 30 is formed larger than the first outer diameter d1. Therefore, the tube 2 and the side plate 3 are not pressure-bonded, and the tube 2 does not receive a tube expansion load from the side plate 3.

  As shown in FIG. 9, the expanded billet of the first expanded tube 60 is inserted up to the portion inserted through the fins 4 on which the tubes 2 are arranged. The expanded billet is inserted through the entire portion of the tube 2 that is inserted through the fin 4. Since the hole inner diameter df of the fin hole 42 is formed smaller than the first outer diameter d1, the fin hole 42 is pressure-bonded to the outer peripheral surface of the expanded pipe 2. At this time, the inner diameter of the fin hole 42 is expanded from the hole inner diameter df to an inner diameter substantially the same as the first outer diameter d1. When the expanded billet of the first expander 60 is inserted over the entire portion of the tube 2 through which the fins 4 are inserted, the first expander 60 is pulled out from the tube 2 and the first expansion step S20 is completed.

  It progresses to 2nd pipe expansion process S30 after 1st pipe expansion process S20. In the second tube expansion step S30, the second tube expander 61 is inserted into the tube 2. FIG. 10 is a view showing a state immediately before the second expander 61 is inserted into the tube 2. The second expanded tube 61 has an expanded diameter portion 61b having an outer diameter capable of expanding the outer diameter of the tube 2 up to the second outer diameter d2, and an end portion of the expanded diameter portion 61b in the insertion direction of the second expanded tube 61. And a tip portion 61a having a tapered shape that gradually decreases in diameter. The second pipe expander 61 has a tapered flare forming portion 61c that gradually increases in diameter from the end opposite to the tip 61a side of the enlarged diameter portion 61b in the direction opposite to the insertion direction. The second tube expander 61 is a tube expander that can expand the tube 2 by being inserted into the tube opening portion 240 from the distal end portion 61a.

  The second tube 61 passes through the inside of the tube 2 while further expanding the tube 2 expanded by the first tube 60. The second tube 61 is inserted until the portion of the tube 2 inside the opening end 31 is expanded to the second outer diameter d2. Thereby, the outer peripheral surface of the pipe 2 expanded to the second outer diameter d2 and the inner peripheral surface of the opening 30 are pressure-bonded. Therefore, the opening inner diameter ds and the second outer diameter d2 have the same size. In addition, the inner peripheral surface of the opening 30 that comes into contact with the pipe 2 expanded to the second outer diameter d2 may be larger than the opening inner diameter ds by the pipe expansion. In this case, the inner diameter of the portion of the opening 30 that has been expanded by the tube expansion, that is, the inner diameter of the portion that contacts the second portion 23 of the tube 2 is equal to the second outer diameter d2.

  As shown in FIG. 11, the second expanded tube 61 is inserted until the end of the portion of the tube 2 that has been expanded to the second outer diameter d2 is located at substantially the same position as the opening end 32 in the tube axis direction. Is done. The insertion of the second tube 61 is performed up to the portion of the tube 2 that is inserted through the fin hole 42. In this manner, the second tube expander 161 expands at least a part of the portion of the tube 2 inserted through the side plate 3. At this time, the tube opening portion 240 is expanded into a flare shape by the flare forming portion 61 c of the second tube expander 61. Therefore, it can also be said that the second tube expander 61 is inserted to a position where the tube is expanded in a flare shape toward the tube opening portion 240. In this way, the second tube expander 61 forms the flare portion 24 whose diameter is expanded in a flare shape toward the tube opening portion 240 as compared with the second portion 23. Then, as shown in FIG. 12, the 2nd pipe expander 61 is reversely moved and extracted from the inside of the pipe 2, and 2nd pipe expansion process S30 is complete | finished. Thereby, as shown in FIG. 3, the heat exchanger 1 with which the pipe | tube 2 was integrated with the fin 4 and the side plate 3 can be manufactured.

  In the second tube expanding step S30, the second tube expander 61 is inserted to the near side of the portion of the tube 2 that is inserted through the fin hole 42. Instead, the portion where the second pipe expander 61 is inserted into the fin hole 42 of the pipe 2 may be expanded to the second outer diameter d2 to the extent that no problem occurs in the performance of the heat exchanger 1. For example, the second tube expander 61 may be inserted until the portion of the tube 2 inserted through the fin hole 42 in one fin 4 adjacent to the side plate 3 is expanded to the second outer diameter d2. Alternatively, the second expander 61 is inserted until the portion of the tube 2 inserted through the fin holes 42 of the plurality of fins 4 including one fin 4 adjacent to the side plate 3 is expanded to the second outer diameter d2. May be. In the case of such a configuration, for example, the fin hole 42 may not be able to withstand the diameter expansion by the second tube expander 61 and may be damaged. However, if the manufactured heat exchanger 1 does not cause a problem in use, such a configuration is possible. Can be tolerated.

  Next, the effect which the heat exchanger 1 of 1st Embodiment and the manufacturing method of the heat exchanger 1 bring about is demonstrated. The heat exchanger 1 according to the first embodiment includes a pipe 2 formed of an aluminum material and expanded, and a plurality of fins 4 each having a fin hole 42 through which the pipe 2 is inserted and arranged in one direction. . The heat exchanger 1 includes a side plate 3 provided on the outside of the fin 4 located at an end in one direction among the plurality of fins 4 and having an opening 30 through which the pipe 2 is inserted. The tube 2 has a first outer diameter d1, a first portion 21 that is in close contact with the inner peripheral surface of the fin hole 42, a second outer diameter d2 that is larger than the first outer diameter d1, and the opening 30 It has the 2nd part 23 closely_contact | adhered with an internal peripheral surface.

  According to this, in the heat exchanger 1, the second outer diameter d2 of the second portion 23 of the pipe 2 that is in close contact with the side plate 3 by the expansion of the pipe is the It is formed to be larger than one outer diameter d1. Therefore, when the tube 2 is expanded and fixed to the fins 4 and the side plates 3, the expansion of the first portion 21 and the expansion of the second portion 23 can be performed in separate steps. For this reason, the load which acts on a pipe | tube at the time of pipe expansion can be reduced. For this reason, it can suppress that the aluminum powder generate | occur | produced when fixing the pipe | tube 2 and the side plate 3 by pipe expansion adheres to the pipe expansion billet of the 1st pipe expansion element 60. FIG. Therefore, it is possible to prevent the inner surface of the tube 2 from being scraped by the first tube expander 60 to which aluminum powder has adhered when the tube 2 and the fin 4 are fixed by tube expansion. Moreover, in order to expand the 2nd tube 61 to the part penetrated by the side plate 3 of the pipe | tube 2, it was penetrated by the fin 4 of the pipe | tube 2 by the 2nd tube 61 to which aluminum powder adhered at this time. It can suppress that a part is expanded. From the above, it is possible to provide a heat exchanger that can suppress problems caused by tube expansion.

  The tube 2 further includes a flare portion 24 that is expanded from the second portion 23 to the tube opening portion 240 so as to expand the bottom. According to this configuration, the heat exchanger 1 can have a function of improving the connection workability of connecting and connecting a separate pipe to the pipe 2, and can improve manufacturability and product expandability. Is obtained.

  In the manufacturing method of the heat exchanger 1 of the first embodiment, in the disposing step S10, the plurality of fins 4 each having the fin hole 42 having the hole inner diameter df and the opening inner diameter ds larger than the hole inner diameter df are provided. The side plate 3 in which the opening 30 is formed is arranged. At this time, the side plate 3 and the fins 4 are arranged in one direction so that the side plate 3 is disposed on the outermost side. Then, the pipe 2 having the raw pipe outer diameter dt smaller than the hole inner diameter df is inserted into the fin hole 42 and the opening 30. After the arrangement step S10, the process proceeds to the first tube expansion step S20. In the first pipe expanding step S20, the first tube expander 60 that can expand the outer diameter of the pipe 2 to the first outer diameter d1 larger than the hole inner diameter df and smaller than the opening inner diameter ds is supplied from the pipe opening 240 to the pipe 2. The portion inserted through the plurality of fins 4 is inserted into the tube 2. After the arrangement step S10, the process proceeds to the second tube expansion step S30. In the second tube expansion step S30, the second tube expander 61 capable of expanding the outer diameter of the tube 2 to the second outer diameter d2 having a size equal to or larger than the opening inner diameter ds is the portion of the tube 2 inserted through the side plate 3. It inserts in the inside of the pipe | tube 2 so that at least one part may be expanded.

  According to this, it is possible to avoid receiving a load from the side plate 3 when the first tube expander 60 is inserted through the portion of the tube 2 inserted through the side plate 3. For this reason, the load which acts on the pipe | tube 2 at the time of pipe expansion can be reduced. For this reason, the quantity of the aluminum powder generate | occur | produced compared with the past can be suppressed. Therefore, when the 1st pipe expander 60 penetrates the part of the pipe 2 penetrated by the fin 4, it can suppress that aluminum powder adheres to a pipe expansion billet. Further, the second tube 61 that receives a load from the side plate 3 does not pass through the portion of the tube 2 that is inserted into the fin 4. For this reason, it can be avoided that the second tube expander 61 to which the aluminum powder generated by the load from the side plate 3 is attached passes through the portion of the tube 2 inserted through the fin 4. Therefore, it can suppress that the part penetrated by the fin 4 of the pipe | tube 2 by the 2nd pipe expander 61 to which aluminum powder adhered is expanded. From the above, it is possible to provide a method of manufacturing a heat exchanger that can suppress problems caused by tube expansion.

  The tube 2 has a groove portion 26b on the inner peripheral surface. In the conventional heat exchanger, there is a problem in that the groove forming portion is crushed by the load acting on the inner peripheral surface of the tube at the time of pipe expansion, and the effect of improving the heat exchange performance by the groove portion is reduced. In the heat exchanger 1 of the first embodiment, since the load acting on the pipe 2 at the time of pipe expansion is suppressed, the projection 26a forming the groove 26b is prevented from being crushed, and the effect of improving the heat exchange performance can be obtained. .

(Modification 1 of the first embodiment)
The modification 1 of the heat exchanger 1 of 1st Embodiment is demonstrated with reference to FIG. In this modification, in the second tube expansion step S30, the tube 2 is expanded to the position of the open end 32 in the tube axis direction. The end portion of the second portion 23 on the tapered portion 22 side is located at substantially the same position as the opening end 32 in the tube axis direction. Therefore, the tube 2 is crimped to the entire inner peripheral surface of the opening 30. The tapered portion 22 is inserted through the fin hole 42 of the fin 4 adjacent to the side plate 3.

  In the heat exchanger 1 of Modification 1, the tube 2 and the side plate 3 are pressure-bonded over the entire inner peripheral surface of the opening 30. Therefore, the tube 2 and the side plate 3 can be more stably fixed.

(Modification 2 of the first embodiment)
The modification 2 of the heat exchanger 1 of 1st Embodiment is demonstrated with reference to FIG. In the modified example 2, in the arranging step S10, the plurality of fins 4 are arranged so as to have a gap between the flange portion 41b and the adjacent fins 4. The fins 4 adjacent to the side plate 3 are arranged so as to have a gap between the flange portion 41 b and the side plate 3. In the second tube expansion step S30 in Modification 2, the second tube expander 61 is inserted so as to expand the tube 2 to a portion inside the opening end 32 in the tube axis direction. The second tube expander 61 expands the tube 2 to the second outer diameter d2 up to the front of the fin hole 42 adjacent to the side plate 3.

  In the heat exchanger 1 of Modification 2, the end portion on the tapered portion 22 side of the second portion 23 is located between the opening end 32 and the end portion on the side plate 3 side of the fin hole 42. Therefore, the tube 2 is crimped to the entire inner peripheral surface of the opening 30. The tapered portion 22 is inserted through the fin hole 42 of the fin 4 adjacent to the side plate 3.

  The plurality of fins 4 are arranged so as to have a gap between the flange portion 41 b and the adjacent fins 4. Thus, the heat exchanger 1 may have the fins 4 that are spaced apart from the flange portions 41 b of the adjacent fins 4. The fins 4 adjacent to the side plate 3 are arranged so as to have a gap between the flange portion 41 b and the side plate 3. Thus, the heat exchanger 1 may have the fin 4 adjacent to the side plate 3 in which the flange portion 41 b is separated from the side plate 3.

(Modification 3 of the first embodiment)
The modification 3 of the heat exchanger 1 of 1st Embodiment is demonstrated with reference to FIG. The side plate 3 has a chamfered portion 33 at the opening end 32 of the opening 30. The chamfered portion 33 is a portion that is chamfered in a tapered shape so that the opening end 32 increases in diameter toward the fin 4 side. Therefore, the chamfered portion 33 is a portion that is not in close contact with the second portion 23 of the tube 2 in the opening 30.

  When the pipe 2 is expanded in the second pipe expansion step S30, the pipe 2 and the chamfered portion 33 are not in contact with each other. Therefore, the load which the 2nd pipe expander 61 receives from the side plate 3 in 2nd pipe expansion process S30 by the chamfer 33 can be reduced. The chamfered portion 33 may be formed at the opening end 31. That is, the chamfered portion 33 may be a portion that is chamfered in a tapered shape so that the diameter of the open end 31 is increased outward.

  In FIG. 15, the tube 2 is expanded to the second outer diameter d2 up to the same position as the opening end 32 in the tube axis direction, but the expansion may be stopped slightly outside the opening end 32, and the opening The tube may be expanded to the inside somewhat from the end 32. In other words, the end portion on the tapered portion 22 side of the second portion 23 may be located slightly outside or inside the opening end 32 in the tube axis direction.

(Second Embodiment)
In the second embodiment, another embodiment of the heat exchanger 1 in the first embodiment will be described. In FIGS. 16 to 20, components denoted by the same reference numerals as those in the drawings of the first embodiment are similar components and exhibit the same operational effects.

  The tube 2 includes a first portion 21 that is inserted into the fin hole 42, a tapered portion 22 that is crimped to the inner peripheral surface of the opening 30, and a second portion 23 that is formed outside the side plate 3. At least a part of the tapered portion 22 is crimped to the inner peripheral surface of the opening 30. The tapered portion 22 is formed so as to be crimped to the opening end 31 of the opening 30. The tapered portion 22 is a portion of the tube 2 that is expanded so that the outer diameter of the tube 2 changes from the first outer diameter d1 to the second outer diameter d2. The taper portion 22 is an example of an intermediate portion. In the second portion 23, the end on the tapered portion 22 side is located closer to the tube opening 240 than the opening end 31 of the opening 30. In the tube 2, the side plate 3 is fixed to the tube 2 by crimping the tapered portion 22. The tube 2 sandwiches the side plate 3 by the tapered portion 22 and the flange portion 41 b of the fin 4 adjacent to the side plate 3. The heat exchanger 1 of the second embodiment is suitable for use as a stationary heat exchanger.

  Next, the manufacturing method of the heat exchanger 1 of 2nd Embodiment is demonstrated with reference to FIGS. As shown in the flowchart of FIG. 17, the heat exchanger 1 is manufactured through an arrangement step S10, a first tube expansion step S20, and a second tube expansion step S230. The disposing step S10 and the first tube expanding step S20 are the same as the steps described with reference to FIGS.

  It moves to 2nd pipe expansion process S230 after 1st pipe expansion process S20. In the second pipe expanding step S230, first, the first pipe expander 60 is inserted to fix the pipe 2 and the fins 4, and then the second pipe expander 61 is inserted into the pipe 2 from the pipe opening 240 as shown in FIG. . As shown in FIG. 19, the second tube 61 passes through the tube 2 while expanding the tube 2 to the second outer diameter d2, and stops when the diameter is expanded to the second outer diameter d2 before the opening end 31. To do. The second tube 61 is advanced to a position where the tapered portion 22 formed by the second tube 61 contacts the opening end 31. That is, the opening 30 and the tapered portion 22 are in close contact with each other, and the second tube 61 is advanced to a position where the side plate 3 and the tube 2 are fixed. Thereafter, as shown in FIG. 20, the second tube 61 is moved backward and pulled out from the tube 2, and the second tube expansion step S230 is completed. Thereby, as shown in FIG. 16, the heat exchanger 1 in which the pipe 2 is integrated with the fins 4 and the side plates 3 can be manufactured.

  The side plate 3 may not be sandwiched between the tapered portion 22 of the tube 2 and the flange portion 41 b of the fin 4 in a portion where one or some of the tubes 2 are inserted. That is, as shown in FIG. 21, the flange portion 41 b of the fin 4 may be separated from the side plate 3. Even in such a case, the portion of the tube 2 where the flange portion 41b is separated from the side plate 3 is in relation to the side plate 3 as long as the side plate 3 is sandwiched in the portion where the other tube 2 is inserted. Can be fixed.

  Next, the effect which the heat exchanger 1 of 2nd Embodiment and the manufacturing method of the heat exchanger 1 bring about is demonstrated. The heat exchanger 1 of the second embodiment includes a tube 2 formed of an aluminum material and expanded. The heat exchanger 1 includes a plurality of fins 4 each having fin holes 42 through which the pipes 2 are inserted and arranged in one direction, and outside the fins located at the end in one direction among the plurality of fins 4. A side plate 3 provided with an opening 30 through which a pipe is inserted. The tube 2 has a first outer diameter d1, a first portion 21 that is in close contact with the inner peripheral surface of the fin hole 42, a second portion 23 that has a second outer diameter d2 that is larger than the first outer diameter d1, and The taper portion 22 is in close contact with the inner peripheral surface of the opening 30 and connects the first portion 21 and the second portion 23. The tapered portion 22 is in close contact with at least the opening end 31 of the opening 30.

  According to this, in the heat exchanger 1, the first portion 21 of the tube 2 is in close contact with the fin 4, the tapered portion 22 of the tube 2 is in close contact with the side plate 3, and the second portion 23 of the tube 2 is in contact with the side plate 3. It is located outside. Therefore, when the tube 2 is expanded and fixed to the fins 4 and the side plates 3, the expansion of the first portion 21 and the expansion of the second portion 23 can be performed in separate steps. For this reason, the load which acts on the pipe | tube 2 at the time of pipe expansion can be reduced. For this reason, the aluminum powder generated when the tube 2 and the side plate 3 are fixed by the tube expansion adheres to the tube expansion billet of the first tube expander 60 when the tube 2 and the fin 4 are fixed by the tube expansion. You can avoid that. As described above, it is possible to provide a heat exchanger capable of suppressing the problems caused by the pipe expansion.

  In the manufacturing method of the heat exchanger 1 according to the second embodiment, in the second tube expansion step S230, the tube 2 has a second outer diameter that can be expanded to a second outer diameter d2 that is larger than the opening inner diameter ds. The expander 61 is inserted to a position where the tapered portion 22, which is a portion where the outer diameter of the tube 2 is expanded from the first outer diameter d 1 to the second outer diameter d 2, is in close contact with the opening end 31 of the opening 30.

  According to this disclosure, it is possible to avoid receiving a load from the side plate 3 when the first tube expander 60 is inserted through the portion of the tube 2 inserted through the side plate 3. For this reason, the load which acts on a pipe | tube at the time of pipe expansion can be reduced. For this reason, the quantity of the aluminum powder generate | occur | produced compared with the past can be suppressed. Therefore, when the 1st pipe expander 60 penetrates the part of the pipe | tube 2 penetrated by the fin 4, it can suppress that aluminum powder adheres to the pipe expansion billet of the 1st pipe expander 60. FIG. Further, the second tube 61 that receives a load from the side plate 3 does not pass through the portion of the tube 2 that is inserted into the fin 4. For this reason, it can be avoided that the second tube expander 61 to which the aluminum powder generated by the load from the side plate 3 is attached passes through the portion of the tube 2 inserted through the fin 4. From the above, it is possible to provide a method of manufacturing a heat exchanger that can suppress problems caused by tube expansion.

  In the heat exchanger 1 of the second embodiment, the flange portion 41 b of the fin 4 adjacent to the side plate 3 is in contact with the side plate 3. Thereby, the side plate 3 can be clamped and fixed between the tapered portion 22 of the tube 2 and the flange portion 41 b of the fin 4. Therefore, it is not necessary to insert the second tube expander 61 until the inner peripheral surface of the opening 30 and the outer peripheral surface of the second portion 23 of the tube 2 are in close contact. Thereby, since the tube expansion load at the time of inserting the 2nd tube expander 61 can be suppressed, it becomes possible to reduce the cost of the equipment which implements tube expansion.

(Modification of the second embodiment)
A modification of the second embodiment will be described with reference to FIG. In the modification, a tapered chamfered portion 31 a is formed at the opening end 31 of the side plate 3. The chamfered portion 31a is formed in the side plate 3 in advance before the arrangement step S10. Alternatively, the chamfered portion 31a may be formed immediately before the second tube expansion step S230. The chamfered portion 31a is in close contact with the tapered portion 22 formed in the tube 2 by the second tube expansion step S230. Even in such a configuration, since the side plate 3 is sandwiched between the tapered portion 22 of the tube 2 and the flange portion 41b of the fin 4, the side plate 3 and the tube 2 can be fixed.

(Third embodiment)
In 3rd Embodiment, the other manufacturing method is disclosed regarding the manufacturing method of the heat exchanger 1 of 1st Embodiment. In FIG. 23 to FIG. 27, steps and components denoted by the same reference numerals as those in the drawings of the first embodiment are similar steps and components, and have the same operational effects.

  A method for manufacturing the heat exchanger 1 of the third embodiment will be described with reference to FIGS. As shown in FIG. 23, the heat exchanger 1 is manufactured by an arrangement step S10, a first tube expansion step S20, a second tube expansion step S330, and a third tube expansion step S340. The arrangement step S10 and the first tube expansion step S20 are the same as the steps described with reference to FIGS. 7 to 9 in the first embodiment. Hereinafter, contents different from the above-described embodiment will be described.

  The manufacturing method of the third embodiment is a method in which the second tube expansion step S30 in the above-described embodiment is divided into a second tube expansion step S330 that forms the second portion 23 and a third tube expansion step S340 that forms the flare portion 24. is there.

  According to the manufacturing method of 3rd Embodiment, 2nd pipe expansion process S330 is performed after 1st pipe expansion process S20. In the second tube expansion step S330, the second tube expander 161 is inserted into the tube 2. FIG. 24 is a diagram showing a state immediately before the second expander 161 is inserted into the tube 2. The second expanded tube 161 has an expanded diameter portion 61b having an outer diameter capable of expanding the outer diameter of the tube 2 to the second outer diameter d2, and an end portion of the expanded diameter portion 61b in the insertion direction of the second expanded tube 61. And a tip portion 61a having a tapered shape that gradually decreases in diameter. The second tube expander 161 is a tube expander that can expand the tube 2 by being inserted into the tube opening portion 240 from the distal end portion 61a. As shown in FIG. 25, the second tube 161 is formed inside the tube 2 so as to expand at least a part of the portion of the tube 2 inserted through the side plate 3, as in the first embodiment. It is inserted from the tube opening part 240. In the second tube expanding step S330, the tapered portion 22 is formed by the tip portion 61a, and the second portion 23 is formed by the expanded diameter portion 61b.

  After the second tube expansion step S330, a third tube expansion step S340 is performed. In the third tube expansion step S340, the third tube expander 62 is inserted into the tube 2. FIG. 26 is a view showing a state immediately before the third expander 62 is inserted into the tube 2. The 3rd pipe expander 62 has the flare formation part 62a which has a taper shape gradually diameter-reduced toward the insertion direction of the 3rd pipe expander 62 from the edge part of a cylindrical shaft part. As shown in FIG. 25, the third tube expander 62 is a tube expander that can expand the tube port portion 240 in a hem-like shape by being inserted into the tube port portion 240 from the distal end portion. 3rd pipe expansion process S340 is a process of forming the flare part 24 in which an internal diameter expands toward the tube opening part 240 of the pipe | tube 2 as a process separate from 1st pipe expansion process S20 and 2nd pipe expansion process S. FIG.

  In the second tube expansion step S330 of the third embodiment, the portion of the tube 2 that is expanded so that the outer diameter of the tube 2 changes from the first outer diameter d1 to the second outer diameter d2 You may make it replace with the process inserted in the inside of the pipe | tube 2 to the position closely_contact | adhered to the outer side open end 31 of the opening part 30.

  The manufacturing method of the heat exchanger 1 of 3rd Embodiment forms the flare part 24 to which an internal diameter expands toward the tube opening part 240 of the pipe | tube 2 as a process separate from 1st pipe expansion process S20 and 2nd pipe expansion process S330. The third tube expansion step S340 is performed. According to this manufacturing method, since the first portion 21, the second portion 23, and the flare portion 24 in which the expanded portion is formed in the tube 2 can be performed by separate steps, two of the expanded portions are not formed at the same time. The load concerning the pipe 2 can be suppressed. Therefore, it is possible to provide a manufacturing method capable of suppressing problems such as buckling of the tube 2.

(Other embodiments)
The disclosure of this specification is not limited to the illustrated embodiments. The disclosure encompasses the illustrated embodiments and variations by those skilled in the art based thereon. For example, the disclosure is not limited to the combination of components and elements shown in the embodiments, and various modifications can be made. The disclosure can be implemented in various combinations. The disclosure may have additional parts that can be added to the embodiments. The disclosure includes those in which the components and elements of the embodiment are omitted. The disclosure encompasses parts, element replacements, or combinations between one embodiment and another. The technical scope disclosed is not limited to the description of the embodiments. Some technical scope disclosed is indicated by the description of the claims, and should be understood to include all modifications within the meaning and scope equivalent to the description of the claims. .

  In the above-described embodiment, the second tube 61 is inserted after the first tube 60 is pulled out from the tube 2. However, the second tube 61 may be inserted without pulling out the first tube 60. . In this case, for example, a second expander having an insertion hole coaxial with the mandrel that can be inserted through the mandrel of the first expander 60 may be used. That is, in a state where the first tube 60 is inserted into the tube 2, the second tube is inserted into the tube 2 while inserting the mandrel through the insertion hole, so that the second tube 60 is not pulled out. It is possible to shift to the pipe expansion process.

  In the above-described embodiment, the tube 2 has a circular cross section perpendicular to the axial direction, but the cross sectional shape is not limited to a circular shape. For example, you may employ | adopt the pipe | tube 2 whose cross section perpendicular | vertical to an axial direction is a flat ellipse shape.

  In the above-described embodiment, the first tube 60 and the second tube 61 are expanded into a circular shape having a cross-sectional shape similar to that before the tube 2 is expanded, but the tube 2 is expanded into a different shape. It may be. For example, the first tube 60 and the second tube 61 may be tubes that expand so that the cross section of the tube 2 changes from a circular shape to a polygonal shape. Moreover, the 1st pipe expander 60 and the 2nd pipe expander 61 may be a pipe expander which expands so that the cross-sectional shape of the pipe | tube 2 may protrude from the shape before pipe expansion. That is, the first tube expander 60 and the second tube expander 61 may be tube expanders that expand so that a part of the tube 2 is expanded in diameter.

  In the above-described embodiment, the collar portion 41 is formed by the bent portion 41a protruding from the base portion 40 and the end portion rising from the bent portion 41a. However, the shape of the collar portion 41 is not limited to this. For example, the collar portion 41 may have a shape that does not have the flange portion 41b.

  In the above-described embodiment, the fin 4 has the collar portion 41, but a configuration without the collar portion 41 may be used. That is, the fin hole 42 may be formed in the base portion 40 of the fin 4 directly by punching or the like.

  In the above-described embodiment, the second tube expansion step is performed after the first tube expansion step is performed. However, the first tube expansion step may be performed after the second tube expansion step is performed.

  Although the manufacturing method disclosed in the above-described embodiment has been described so as to be performed in the order of the first tube expansion step, the second tube expansion step, and the third tube expansion step, the first tube expansion step, the second tube expansion step, and the third tube expansion step. Each process should just be implemented after an arrangement | positioning process. Therefore, the execution order of the first pipe expansion process, the second pipe expansion process, and the third pipe expansion process is not limited to the order described in the above embodiment.

DESCRIPTION OF SYMBOLS 2 ... Pipe, 21 ... 1st part, 22 ... Tapered part (intermediate part), 23 ... 2nd part 24 ... Flare part, 26b ... Groove part, 3 ... Side plate, 30 ... Opening part 31 ... Opening end (outside opening end) ), 4 ... Fin, 41b ... Flange (contact part)
42 ... fin hole 60 ... first tube expander 61 ... second tube expander 240 ... port opening S10 ... installation step S20 ... first tube expand step S30, S230 ... second tube expand step d1 ... first outside Diameter, d2 ... second outer diameter, df ... hole inner diameter, ds ... opening inner diameter dt ... element tube outer diameter

Claims (8)

A tube (2) formed and expanded from an aluminum material;
A plurality of fins (4) each having a fin hole (42) through which the tube is inserted and arranged in one direction;
A side plate (3) in which an opening (30) through which the pipe is inserted is formed outside the fin located at the end in the one direction among the plurality of fins;
With
The tube has a first outer diameter (d1), a first portion (21) in close contact with the inner peripheral surface of the fin hole, and a second outer diameter (d2) larger than the first outer diameter. And a second portion (23) in close contact with the inner peripheral surface of the opening. A tube (2) formed and expanded from an aluminum material;
A plurality of fins (4) each having a fin hole (42) through which the tube is inserted and arranged in one direction;
A side plate (3) provided on the outside of the fin located at an end in the one direction among the plurality of fins and having an opening (30) through which the pipe is inserted;
The tube has a first outer diameter (d1), a first portion (21) in close contact with the inner peripheral surface of the fin hole, and a second outer diameter (d2) larger than the first outer diameter. A second portion (23), and an intermediate portion (22) that is in close contact with the inner peripheral surface of the opening and connects the first portion and the second portion;
The intermediate portion is a heat exchanger in close contact with at least the outer opening end (31) of the opening.   The heat exchanger according to claim 2, wherein the fin adjacent to the side plate has a contact portion (41b) that contacts the side plate.   The said pipe | tube is a heat exchanger of any one of Claims 1-3 which have a groove part (26b) in an internal peripheral surface.   The heat exchanger according to any one of claims 1 to 4, wherein the tube further includes a flare portion (24) that is widened from the second portion to the tube opening (240). A method of manufacturing a heat exchanger comprising a tube (2) formed of an aluminum material, a plurality of fins (4), and a side plate (3),
The plurality of fins each having a fin hole having a hole inner diameter (df) and the side plate having an opening (30) having an opening inner diameter (ds) larger than the hole inner diameter, An arrangement step (S10) in which the plates are arranged in one direction so as to be arranged on the outermost side, and the tube having an outer diameter (dt) smaller than the inner diameter of the hole is inserted into the fin hole and the opening,
After the disposing step, a first tube expander (60) capable of expanding the outer diameter of the tube to a first outer diameter (d1) that is larger than the inner diameter of the hole and smaller than the inner diameter of the opening; A first tube expanding step (S20) for inserting from the mouth portion (240) to the portion inserted through the plurality of fins into the tube;
After the disposing step, the second tube expander (61) capable of expanding the outer diameter of the tube to a second outer diameter (d2) larger than the inner diameter of the opening is inserted through the side plate. And a second tube expansion step (S30; S330) for inserting into the tube from the tube port portion of the tube so as to expand at least a part of the tube portion. A method of manufacturing a heat exchanger comprising a tube (2) formed of an aluminum material, a plurality of fins (4), and a side plate (3),
The plurality of fins each having a fin hole having a hole inner diameter (df) and the side plate having an opening having an opening inner diameter (ds) larger than the hole inner diameter are formed on the outermost side plate. An arrangement step (S10) of arranging the pipes having a base pipe outer diameter (dt) smaller than the inner diameter of the hole through the fin hole and the opening, arranged in one direction so as to be arranged in
After the disposing step, a first tube expander (60) capable of expanding the outer diameter of the tube to a first outer diameter (d1) that is larger than the inner diameter of the hole and smaller than the inner diameter of the opening; A first tube expansion step (S20) that is inserted from the mouth (240) into the tube to a portion that is inserted through the plurality of fins in the tube;
After the arranging step, a second tube expander (61) capable of expanding the outer diameter of the tube to a second outer diameter (d2) larger than the inner diameter of the opening, the outer diameter of the tube is the first outer diameter. A second tube expanding step (S230; S330) in which the portion of the tube whose diameter is expanded so as to change from the second outer diameter to the second outer diameter is inserted into the tube until it comes into close contact with the outer opening end (31) of the opening. And a method of manufacturing a heat exchanger.   Further, after the disposing step, a third tube expansion forming a flare portion (24) whose inner diameter expands toward the port portion of the tube as a step separate from the first tube expansion step and the second tube expansion step. The manufacturing method of the heat exchanger of Claim 6 or Claim 7 which has a process (S340).

Images