JP2005127676A - Heat exchanger, and manufacturing method of heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance engagement strength of recess-projection engagement while improving attachment working efficiency of a tank body and a core plate in a radiator wherein the tank body and the core plate are attached by recess-projection engagement. <P>SOLUTION: A projecting part 5f fitting into a recessed part 5e is formed by plastic working such as coining after mutually attaching the tank body 5b and the core plate 5a. By this, malfunction such as the projecting part 5f sliding on the tank body 5b does not occur in principle when attaching the tank body 5b and the core plate 5a. Accordingly, the engagement strength of recess-projection engagement can be enhanced while improving attachment workability of the tank body 5b and the core plate 5a when attaching the tank body 5b and the core plate 5a by recess-projection engagement. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a heat exchanger and a method for manufacturing heat exchange.

  In joining the core plate and the tank body constituting the header tank of the heat exchanger, conventionally, the core plate is provided with a convex portion, the tank main body is provided with a concave portion, and the tank main body is provided with a convex portion of the core plate. After fitting and temporarily assembling the core plate and the tank body, the core plate and the tank body were brazed (for example, refer to Patent Document 1).

In addition, a core plate is what a tube is joined to and is called sheet metal in Patent Document 1. The tank main body is joined to the core plate to form a tank internal space together with the core plate. In Patent Document 1, it is called a cap cell.
JP-A-10-122784

  However, in the invention described in Patent Document 1, since the tank main body is assembled to the core plate after the concave portion is provided in the tank main body and the core plate is provided with the convex portion, the tank main body and the core plate are bent at the time of assembling. Therefore, the concave portion and the convex portion have to be fitted, and there is a problem that the workability of assembling the tank body and the core plate is low.

  Moreover, in order to improve the assembly workability between the tank body and the core plate, that is, to improve the fitting workability between the concave portion and the convex portion, it is desirable that the concave portion and the convex portion be hemispherical (dome shape) If the concave and convex portions are hemispherical (dome-shaped), the fitting force between the concave and convex portions is reduced, so that the tank body and the core plate cannot be sufficiently fixed.

  In order to secure a sufficient fitting force, for example, even when the convex portion is formed in a prismatic shape or a cylindrical shape, when the tank body and the core plate are assembled, the corner portion of the convex portion is slid by the tank main body and scraped. Therefore, there is a high possibility that a sufficient fitting force cannot be obtained.

  In view of the above points, the present invention firstly provides a novel heat exchanger different from the conventional one and a method for manufacturing the same, and secondly, a heat exchanger in which a tank body and a core plate are assembled in an uneven fitting. It is an object of the present invention to improve the fitting force of the uneven fitting while improving the workability of assembling the tank body and the core plate.

  In order to achieve the above object, according to the present invention, a plurality of tubes (2) through which fluid flows and fins joined to the outer surface of the tubes (2) to promote heat exchange are provided. In a heat exchanger comprising: a core part (4) having (3); and a header tank (5) arranged on both ends in the longitudinal direction of the tube (2) and communicating with the plurality of tubes (2). (5) includes a core plate (5a) to which the tube (2) is bonded, and a tank body (5b) that is bonded to the core plate (5a) and forms a tank internal space (5c) together with the core plate (5a). Furthermore, a concave portion (5e) is provided in one (5b) of the joints between the tank body (5b) and the core plate (5a), and the other (5a) Fits into the recess (5e) The convex portion (5f) is provided, and the convex portion (5f) is formed by plastic working in a state where the tank body (5b) and the core plate (5a) are assembled to each other. .

  As a result, when the tank body (5b) and the core plate (5a) as described in the section “Problems to be solved by the invention” are assembled, the projecting portion (5f) becomes, for example, the tank body (5b). In principle, there will be no problem of sliding.

  Therefore, when the tank body (5b) and the core plate (5a) are assembled to the concave and convex fitting, the fitting force of the concave and convex fitting is improved while improving the assembling workability between the tank main body (5b) and the core plate (5a). Can be increased.

  The invention according to claim 2 is characterized in that the concave portion (5e) is formed in a substantially cylindrical shape or a substantially prismatic shape.

  The invention according to claim 3 is characterized in that the tank body (5b) is provided with a recess (5e) and the core plate (5a) is provided with a protrusion (5f).

  In the invention according to claim 4, the cross-sectional shape of the joint portion between the core plate (5a) and the tank body (5b) is formed in a substantially U shape so as to sandwich a part of the tank body (5b). It is characterized by being.

  In invention of Claim 5, it is provided with insert (4a) which is arranged at the end of core part (3), extends in the direction parallel to the longitudinal direction of tube (2), and reinforces core part (3), The insert (4a) is made of A3000 series aluminum.

  Thereby, it becomes possible to curve the core part (4) easily.

  In the invention according to claim 6, a plurality of tubes (2) through which a fluid flows, a core plate (5a) in which the tubes (2) are joined at both longitudinal ends of the tube (2), and a core plate ( 5a) having a tank body (5b) which forms a tank internal space (5c) together with the core plate (5a), and includes a header tank (5) communicating with a plurality of tubes (2). A method of manufacturing a container, wherein a recess (5e) is provided in one of the joints between a tank body (5b) and a core plate (5a), and then a tank body (5b) and a core plate ( 5a) is assembled with each other, and the other is subjected to plastic working to form a convex portion (5f) that fits into the concave portion (5e).

  As a result, when the tank body (5b) and the core plate (5a) as described in the section “Problems to be solved by the invention” are assembled, the projecting portion (5f) becomes, for example, the tank body (5b). In principle, there will be no problem of sliding.

  Therefore, when the tank body (5b) and the core plate (5a) are assembled to the concave and convex fitting, the fitting force of the concave and convex fitting is improved while improving the assembling workability between the tank main body (5b) and the core plate (5a). Can be increased.

  In the invention according to claim 7, the cross-sectional shape of the joint portion (5d) of the core plate (5a) with the tank body (5b) is substantially U-shaped so as to sandwich a part of the tank body (5b). Further, the portion of the tank body (5b) where the recess (5e) is formed is inserted into the joint (5d), and the joint (5d) is sandwiched from the outside by the crimping jig (10). A part (5f) is formed.

  Incidentally, the reference numerals in parentheses of each means described above are an example showing the correspondence with the specific means described in the embodiments described later.

(First embodiment)
In this embodiment, the heat exchanger according to the present invention is applied to a radiator of a motorcycle.

  FIG. 1 is a front view of the radiator 1 according to the present embodiment as viewed from the flow direction of cooling air, FIG. 2 is a perspective view taken along the line AA in FIG. 1, and FIG. 4 and 5 are cross-sectional views taken along the line AA of FIG. 2, FIG. 6 is a two-view drawing of the core plate 5a, and FIG. 7 is a two-view drawing at the longitudinal end of the insert 4a. FIG. 8 is a two-side view showing the assembled state of the insert 4a and the core plate 5a, and FIG. 9 is a view showing a crimping jig.

  In addition, the radiator 1 according to the present embodiment is mounted between a front fork that forms a suspension device for a front wheel and an engine (not shown) that forms a vehicle drive source, and mainly uses traveling wind as cooling air. Cool the cooling water.

  In FIG. 1, a tube 2 is a flat tube through which engine cooling water flowing out from the engine flows. In this embodiment, the tube 2 is made of a light metal having a high thermal conductivity such as an aluminum alloy.

  The fin 3 is joined to the outer surface of the tube 2 to increase the heat transfer area with the cooling air to promote heat exchange between the cooling air and the engine cooling water. 3 adopts corrugated fins that are roller-shaped in a wave shape when viewed from the direction of flow with cooling air.

  In addition, the corrugated fin 3 according to the present embodiment provides an armor window-like louver at a portion connecting the peak and trough of the wave to meander the cooling air and increase the heat transfer coefficient with the cooling air. The core portion 4 for cooling the engine coolant is constituted by the fins 3 and the tubes 2.

  The header tank 5 is located on both ends of the tube 2 in the longitudinal direction and extends in a direction perpendicular to the longitudinal direction of the tube 2 to communicate with each tube 2. In the present embodiment, the header tank 5 on the left side of the page is The high-temperature engine cooling water that has flowed out of the engine is distributed to each tube 2, and the header tank 5 on the right side of the page collects the engine cooling water cooled in the core 4 from each tube 2 and returns it to the engine. It is.

  Incidentally, the introduction pipe 6a is connected to the engine cooling water outflow side of the engine, and the outlet pipe 6b is connected to the engine cooling water inflow side of the engine.

  Note that an insert 4a that extends in a direction parallel to the longitudinal direction of the tube 2 and reinforces the core portion 4 is provided at the end of the substantially rectangular core portion 4. In the present embodiment, the cross section of the insert 4a is provided. The shape is substantially U-shaped, and the material is made of A7000 series aluminum alloy.

  Further, as shown in FIG. 2, the header tank 5 includes a core plate 5a to which the tube 2 is joined, and a tank body 5b that forms a tank internal space 5c together with the core plate 5a. In this embodiment, the core plate 5a and the tank body 5b are both made of an aluminum alloy, and the tube 2, the core plate 5a and the tank body 5b are integrally joined by brazing. Needless to say, it is not limited to the above.

  Here, “brazing” is a technique for joining so as not to melt the base material using brazing material or solder, as described in “connection / joining technology” (Tokyo Denki University Press). say. Incidentally, when joining using a filler material having a melting point of 450 ° C. or higher is called brazing, the filler material at that time is called brazing material, and when joining using a filler material having a melting point of 450 ° C. or less. Is called soldering, and the filler material at that time is called solder.

  In addition, as shown in FIG. 3, a joint 5d of the core plate 5a with the tank body 5b is formed in a substantially U-shaped cross-sectional shape so as to sandwich the end of the tank body 5b. As shown in FIG. 5, a concave portion 5e having a substantially cylindrical depression space is formed on any one side (in the present embodiment, the tank body 5b) of the joining portion 5d by plastic working such as press working. On the other side (in this embodiment, the joint portion 5d), a convex portion 5f fitted into the concave portion 5e of the tank body 5b is formed by plastic working such as press working.

  A plurality of the recesses 5e and the protrusions 5f are provided at predetermined intervals in the longitudinal direction of the header tank 5.

  Further, as shown in FIG. 6, a substantially U-shaped groove 5h into which the longitudinal end of the insert 4a is fitted is provided at the longitudinal end of the core plate 5a, while the longitudinal direction of the insert 4a is provided. As shown in FIG. 7, the end portion is provided with a groove portion 5j that sandwiches both ends in the longitudinal direction of the groove portion 5h of the core plate 5a. In the present embodiment, the depth d of the groove 5j of the insert 4a is approximately the same as the thickness of the core plate 5a.

  Then, as shown in FIG. 8, the insert 4a is inserted into the groove 5h so that the longitudinal end of the insert 4a is sandwiched by the groove 5h of the core plate 5a, and the groove 5h of the core plate 5a is inserted into the groove 5j of the insert 4a. Assemble the core plate 5a and the insert 4a.

  Next, a method for manufacturing the radiator 1 according to this embodiment will be described.

  The tube 2 is manufactured by being molded by an extrusion process or a drawing process, and then cutting a predetermined dimension.

  Further, the core plate 5a is formed into a predetermined shape by, for example, pressing a plate material to form an insertion hole 5g (see FIG. 6A) into which the joint portion 5d and the tube 2 are inserted. In addition, since the convex part 5f is provided in the state which assembled | attached the tank main body 5b to the core plate 5a so that it may mention later, it is not yet provided at this stage.

  In addition, the tank body 5b is press-molded into a predetermined shape so that the cross-sectional shape thereof is substantially U-shaped after the recess 5e is formed by pressing the plate material.

  Further, the fin 3 is formed into a wave shape by a roller forming method or the like, and the insert 4a is formed into a predetermined shape by press working.

  In addition, although the plate | board material which comprises the core plate 5a, the tank main body 5b, and the insert 4a uses the clad material by which the filler material was coat | covered on both surfaces, this embodiment is not limited to this, For example, Needless to say, a clad material in which the filler material is coated only on the surface corresponding to the joint surface may be used.

  Then, after the fins 3 are loaded between the plurality of tubes 2 arranged at predetermined intervals and the core portion 4 is temporarily assembled, the core plate 5a is assembled to the tube 2 and the insert 4a.

  Next, the tube 2 is expanded by enlarging the inner diameter of the end of the tube 2 in the longitudinal direction, that is, the portion of the tube 2 that reaches the portion corresponding to the tank internal space 5c through the core plate 5a. Thus, the tube 2 and the core plate 5a are temporarily fixed.

  On the other hand, the insert 4a and the core plate 5a are assembled by inserting the longitudinal end portion of the insert 4a into the groove 5h of the core plate 5a as described above.

  At this time, the insert 4 a is held by the core plate 5 a by combining the groove 5 h of the core plate 5 a and the groove 5 j of the insert 4 a, and the core plate 5 a is temporarily fixed to the tube 2 by expanding the tube 2. Therefore, the insert 4a is not detached from the core plate 5a.

  Next, after inserting and assembling the end of the tank body 5b into the joint 5d of the core plate 5a, as shown in FIG. 9, the joint 5d is sandwiched from the outside with a substantially J-shaped crimping jig 10. In this state, the joint 5d is pressed by the punch 11 and a part thereof is plastically deformed to form a convex portion 5f that fits into the concave portion 5e, thereby temporarily fixing the tank body 5b and the core plate 5a.

  Then, the tube 2, the fin 3, the insert 4 a and the header tank 5 that have been temporarily fixed (temporary assembly) are heated in the furnace, and the tube 2, the fin 3, the insert 4 a and the header tank 5 (the core plate 5 a and the tank body). 5b) is integrally joined by brazing.

  In addition, a fillet (a lump of filler material) as shown in a black portion in FIG. 3 is formed at the joint between the core plate 5a and the tank body 5b, and the tube 2, the fin 3, the insert 4a, and the header. The tank 5 (the core plate 5a and the tank body 5b) is firmly brazed.

  Next, the function and effect of this embodiment will be described.

  The convex portion 5f that fits into the concave portion 5e is formed by plastic working such as pressing or coining in a state where the tank body 5b and the core plate 5a are assembled to each other. In principle, when the tank body 5b and the core plate 5a are assembled as described above, the problem that the protrusion 5f slides on the tank body 5b does not occur in principle.

  Therefore, when the tank main body 5b and the core plate 5a are assembled in the concave / convex fitting, it is possible to increase the fitting force of the concave / convex fitting while improving the assembling workability between the tank main body 5b and the core plate 5a.

  In addition, since the insert 4a and the core plate 5a are temporarily fixed by combining the grooves 5h and 5j with each other, the insert 4a and the core plate 5a can be easily temporarily fixed without performing caulking work or welding work. In addition, thermal expansion at the time of brazing, that is, heating in the furnace, can be absorbed by the fitting backlash of the grooves 5h and 5j.

  Therefore, it is possible to prevent the occurrence of defective soldering due to temporary fixing failure and crack failure or defective soldering due to thermal stress due to the difference in thermal expansion amount.

(Second Embodiment)
In the present embodiment, the substantial heat exchange area of the core portion 4 is increased without increasing the front projected area of the core portion 4, that is, the area of the core portion 4 projected onto the plane orthogonal to the air flow direction. The present invention relates to a round type (curved type) radiator 1.

  In addition, as shown in FIG. 10, the round type (curved type) radiator 1 is such that the core portion 4 is curved so as to be convex with respect to the air flow direction. In FIG. Although the forward side is convex, this embodiment is not limited to this, and conversely, the backward side in the air flow direction may be convex.

  Incidentally, the angle 7 is a stay for assembling the radiator 1 to the vehicle.

  In bending the radiator 1, the tube 2, the fin 3, the insert 4a and the header tank 5 are temporarily assembled, and then the softened radiator 1 is bent while being heated and brazed in a furnace.

  In this embodiment, the material of the insert 4a is made of aluminum of A3000 series with the cross-sectional shape of the insert 4a being substantially U-shaped as in the first embodiment.

  Thereby, since the core part 4 containing the insert 4a can be easily curved compared with the case where the material of the insert 4a is made of A7000 series aluminum, the productivity of the round-type radiator 1 can be improved. In addition, as in the first embodiment, the insert 4a of the flat radiator 1 and the insert 4a of the round radiator 1 can be shared.

  Incidentally, conventionally, the material of the insert 4a of the round type radiator 1 is made of A7000 series aluminum, and a slit or the like for reducing the bending rigidity of the insert 4a has been provided.

(Other embodiments)
In the above-described embodiment, the space shape of the recess 5e is substantially cylindrical, but the present invention is not limited to this, and may be, for example, a substantially prismatic shape.

  In the above-described embodiment, the heat exchanger and the manufacturing method thereof according to the present invention have been described by taking a two-wheel radiator as an example, but the application of the present invention is not limited to this.

  In the above-described embodiment, the concave portion 5e is provided in the tank body 5b and the convex portion 5f is provided in the core plate 5a. However, the present invention is not limited to this, and conversely, the concave portion 5e is provided in the core. The protrusion 5f may be provided on the tank body 5b.

  Further, the present invention is not limited to the above-described embodiment as long as it matches the gist of the invention described in the claims.

It is the front view which looked at the radiator which concerns on 1st this embodiment of this invention from the distribution direction of cooling air. It is a perspective view in the AA cross section of FIG. It is the B section enlarged view of FIG. It is AA sectional drawing of FIG. 2 in the state before performing a crimping operation | work. It is AA sectional drawing of FIG. 2 in the state after performing a crimping operation | work. It is a two-view figure of the core plate which concerns on 1st Embodiment of this invention. It is a two-view figure in the longitudinal direction edge part of the insert which concerns on 1st Embodiment of this invention. It is a double view which shows the assembly | attachment state of the insert and core plate which concern on 1st Embodiment of this invention. It is a figure which shows a crimping jig. It is a top view of a radiator concerning a 2nd embodiment of the present invention.

Explanation of symbols

  5 ... Header tank, 5a ... Core plate, 5b ... Tank body, 5e ... Recess, 5f ... Projection.

Claims (7)

A core section (4) having a plurality of tubes (2) through which fluid flows, and fins (3) joined to the outer surface of the tubes (2) to promote heat exchange;
In the heat exchanger provided with header tanks (5) arranged on both ends in the longitudinal direction of the tube (2) and communicating with the plurality of tubes (2),
The header tank (5) is joined to the core plate (5a) to which the tube (2) is joined, and is joined to the core plate (5a) to form a tank internal space (5c) together with the core plate (5a). It has a tank body (5b),
Furthermore, a recess (5e) is provided in one (5b) of the joints between the tank body (5b) and the core plate (5a), and the other (5a) is provided in the recess (5e). The projecting portion (5f) is provided, and the projecting portion (5f) is formed by plastic working in a state where the tank body (5b) and the core plate (5a) are assembled to each other. A heat exchanger characterized by that. 2. The heat exchanger according to claim 1, wherein a space shape of the recess (5 e) is formed in a substantially cylindrical shape or a substantially prismatic shape. The heat exchanger according to claim 1 or 2, wherein the concave portion (5e) is provided in the tank body (5b), and the convex portion (5f) is provided in the core plate (5a). . A cross-sectional shape of a joint portion of the core plate (5a) with the tank body (5b) is formed in a substantially U shape so as to sandwich a part of the tank body (5b). The heat exchanger according to claim 3. An insert (4a) disposed at an end of the core (3) and extending in a direction parallel to the longitudinal direction of the tube (2) to reinforce the core (3);
The heat exchanger according to any one of claims 1 to 4, wherein the insert (4a) is made of A3000 series aluminum. A plurality of tubes (2) through which fluid flows;
A core plate (5a) to which the tube (2) is joined at both longitudinal ends of the tube (2), and a tank internal space (5c) together with the core plate (5a) joined to the core plate (5a). And a header tank (5) communicating with a plurality of the tubes (2), and a method of manufacturing a heat exchanger,
After a recess (5e) is provided in any one (5b) of the joints between the tank body (5b) and the core plate (5a), the tank body (5b) and the core plate (5a) A method of manufacturing a heat exchanger, characterized in that in a state assembled with each other, the other (5a) is subjected to plastic working to form a convex portion (5f) that fits into the concave portion (5e). The cross-sectional shape of the joint portion (5d) with the tank body (5b) in the core plate (5a) is substantially U-shaped so as to sandwich a part of the tank body (5b),
Further, with the portion of the tank body (5b) where the recess (5e) is formed inserted into the joint (5d), the caulking jig (10) is used to connect the joint (5d) from the outside. The method for manufacturing a heat exchanger according to claim 6, wherein the convex portion (5f) is formed by being sandwiched.

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