JP2010167454A - Heat exchanger and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To further improve heat exchanging efficiency without greatly restricting an applicable range. <P>SOLUTION: In a heat exchanger 10 including tubes 12 for flowing liquid and fin plates 11 for radiating heat at the outer circumferential surfaces of the tubes 12, the fin plates 11 and the tubes 12 are integrated by diffusion bonding. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a heat exchanger and a method for manufacturing the heat exchanger, and more particularly to a heat exchanger including a tube through which a heat exchange medium is circulated and a fin for heat radiation on the outer peripheral surface of the tube, and a method for manufacturing the heat exchanger.

  Conventionally, in this type of heat exchanger, various ideas have been made to improve heat exchange efficiency. For example, in Patent Literature 1, heat exchange is promoted by forming cuts and raises in the fins and changing the air flow direction. That is, Patent Document 1 improves the heat exchange efficiency by improving the heat transfer coefficient between the fin and the air.

JP 2008-275303 A

  By the way, even if the heat transfer coefficient between the fin and air is improved as described above, it is difficult to greatly improve the heat exchange efficiency as a total heat exchanger when the contact area between the tube and the fin is small. It becomes. In other words, when considering the original performance of the heat exchanger, the most important issue is how to efficiently transfer heat between the heat exchange medium flowing through the tube and the air in contact with the fins. .

  For this reason, in this type of heat exchanger, it is common to secure the contact area between the fin and the tube by applying brazing, applying an adhesive, or welding them.

  However, when brazing or an adhesive is applied, the fin and the tube can be brought into contact with each other on the surface, but the brazing metal or the adhesive exists as a layer between the fin and the tube as an inclusion. Therefore, it cannot be denied that the heat transfer coefficient decreases at the interface between the tube and the inclusion and at the interface between the inclusion and the fin.

  On the other hand, when an electron beam or the like is applied to weld the fin and the tube, there is no inclusion between the fin and the tube. However, the fin and the tube are only in linear contact and are difficult to contact as a surface. In addition, it is not only difficult to apply to fine structures because the welding allowance must be secured, but also the influence of deformation and stress due to high heat must be considered, and the application range is greatly limited. become.

  An object of this invention is to provide the heat exchanger which can aim at the improvement of the further heat exchange efficiency, and its manufacturing method, without largely restrict | limiting an application range in view of the said situation.

  In order to achieve the above object, a heat exchanger according to the present invention includes a tube for circulating a heat exchange medium and a heat dissipating fin on an outer peripheral surface of the tube. Are integrated by diffusion bonding.

  In the heat exchanger according to the present invention, in the heat exchanger described above, the fins have a plate-like heat transfer portion and a plate-like heat dissipation portion that protrudes out of the plane with respect to the heat transfer portion. And is joined to the tube via the heat transfer section.

  Moreover, the heat exchanger which concerns on this invention is a heat exchanger mentioned above, The said fin provided the some heat radiating part with respect to the said heat-transfer part, It is characterized by the above-mentioned.

  The heat exchanger according to the present invention is characterized in that, in the heat exchanger described above, the tube has a flat surface on an outer peripheral surface, and is joined to the heat transfer portion of the fin through the flat surface. To do.

  The method for manufacturing a heat exchanger according to the present invention is a method for manufacturing a heat exchanger comprising a tube for circulating a heat exchange medium and a heat-dissipating fin on the outer peripheral surface of the tube. A step of diffusion bonding a fin plate having a flat plate shape wider than the outer diameter of the tube, and a heat transfer portion bonded to the outer peripheral surface of the tube in the fin plate and outside the bonding region with the tube. And a step of forming fins by bending the heat dissipating part in the out-of-plane direction.

  A heat exchanger manufacturing method according to the present invention is characterized in that, in the heat exchanger manufacturing method described above, a fin plate is diffusion-bonded to a tube previously formed into a desired flow path shape.

  The heat exchanger manufacturing method according to the present invention is characterized in that, in the above heat exchanger manufacturing method, after the fin plate is diffusion bonded to the tube, the tube is formed into a desired flow path shape. And

  Further, the heat exchanger manufacturing method according to the present invention is the above-described heat exchanger manufacturing method, wherein a tube having a circular cross-sectional shape is applied, and the pressure applied upon diffusion bonding with the fin plate is The tube is formed into a flat shape.

  Moreover, the manufacturing method of the heat exchanger which concerns on this invention WHEREIN: In the manufacturing method of the heat exchanger mentioned above, the slit for raising a thermal radiation part previously is formed in the said fin plate, and this fin plate is joined to a tube. It is characterized by.

  Moreover, the manufacturing method of the heat exchanger according to the present invention is the above-described manufacturing method of the heat exchanger, wherein a groove having an arc-shaped cross section is formed in a portion of the fin plate where the tube is disposed, Both are diffusion-bonded with the outer peripheral surface of the tube being in contact with each other.

  Moreover, the manufacturing method of the heat exchanger according to the present invention is the above-described manufacturing method of the heat exchanger, in which a groove having an arc-shaped cross section is formed in a portion corresponding to the tube in the pressurizing jig for diffusion bonding. The fin plate is deformed along the outer peripheral surface of the tube during pressurization during diffusion bonding.

  According to the present invention, by applying diffusion bonding, the heat exchange efficiency can be greatly improved because both can be integrated in a surface contact state without causing inclusions between the fin and the tube. It becomes possible. In addition, since it is not necessary to secure a welding allowance, it is easy to apply to a fine structure, and there is no need to consider the influence of deformation or stress due to high heat, and there is no fear that the application range will be greatly limited.

  Hereinafter, preferred embodiments of a heat exchanger and a method for manufacturing the same according to the present invention will be described in detail with reference to the accompanying drawings.

(Embodiment 1)
1 and 2 show a heat exchanger according to Embodiment 1 of the present invention. The heat exchanger 10 illustrated here is applied when a corrosive liquid (heat exchange medium) is cooled by air, and has a pair of fin plates 11 and a tube 12 for circulating the liquid. is doing.

  The fin plate 11 is formed into a rectangular thin plate shape having a uniform thickness with a material having high thermal conductivity, for example, copper. One side of the fin plate 11 has a length of about 7 to 8 times the outer diameter of the tube 12. On the other hand, the tube 12 is formed into a tubular shape with a material having corrosion resistance to the above-mentioned liquid such as stainless steel, Hastelloy (registered trademark), Inconel (registered trademark), etc., and both end portions 12a are exposed to the outside. In a state, it is held between a pair of fin plates 11. This tube 12 has a pair of flat surfaces 12b on the outer peripheral surface, and is joined to the inner surface of each fin plate 11 via each flat surface 12b.

  The flow path formed by the tube 12 is configured to meander between the pair of fin plates 11 so that the contact area with the fin plate 11 is as large as possible. That is, as apparent from FIG. 1, in the first embodiment, the four straight portions 12c and the three curved portions 12d connecting the straight portions 12c form an “M” shape. The tube 12 is applied. Moreover, the outer shape of the tube 12 except for the both ends 12a is substantially the same, and it exists in the state joined to the inner surface of the fin plate 11 over the full length except the both ends 12a.

  On the other hand, each of the pair of fin plates 11 is provided with a plurality of heat radiating portions 11a. The heat dissipating part 11a cuts between the parts of the fin plate 11 joined to the straight part 12c of the tube 12 (hereinafter referred to as “heat transfer part 11c”), that is, the part outside the joining region with the tube 12 to the outer surface side. It is a tongue-like part formed by raising, and the fin F of the heat exchanger 10 is comprised by the thermal radiation part 11c. In the first embodiment, a plurality of rectangular heat radiating portions 11a having the same width and the same height are provided alternately between one straight portion 12c and the other straight portion 12c of the tube 12. Thus, the ventilation holes 11 b are secured in the respective fin plates 11.

  3-6 shows the manufacturing process of the heat exchanger 10 mentioned above in order. Hereinafter, the manufacturing method of the heat exchanger 10 is demonstrated, referring these drawings suitably.

  First, as shown in FIG. 3, a pair of fin plates 11 and a tube 12 are prepared. The fin plate 11 is previously formed with a slit 11d for raising the heat radiating portion 11a. As the tube 12, a general tube having a circular cross section is prepared, and by bending as appropriate, a desired flow channel shape, that is, four straight portions 12 c in the first embodiment, The three curved portions 12d that connect the straight portions 12c to each other are formed into an “M” shape. Of course, the flow path shape of the tube 12 does not necessarily have an “M” shape, and may be curved as many times as necessary according to the required heat dissipation amount.

  Next, as shown in FIG. 4, the tube 12 is positioned between the pair of fin plates 11. Specifically, the heat transfer part 11c of the fin plate 11 and the linear part 12c of the tube 12 are positioned and arranged so as to face each other. Further, the fin plate 11 and the tube 12 are diffusion-bonded by placing them in an inert gas atmosphere or in a vacuum in a superposed state and heating and pressurizing them at a desired temperature and pressure. In this case, the fin plate 11 and the tube 12 are joined to each other via the flat surface 12b as shown in FIG. 5 by appropriately adjusting the applied pressure and deforming the tube 12 between the fin plates 11 into a flat shape. Let

  Here, in the diffusion bonding described above, several hundred sets of a pair of fin plates 11 and tubes 12 are prepared, and if these are arranged between pressure jigs and heated and pressurized, several hundreds at a time. A set can be manufactured, and productivity can be improved. In addition, it goes without saying that inclusions such as jigs and sheets for inhibiting diffusion bonding need to be arranged between the sets, that is, in the portion where the fin plates 11 directly face each other.

  Finally, as shown in FIG. 6, the heat radiation portion 11a formed on each fin plate 11 is cut and raised in the out-of-plane direction along the slit 11d, and the heat radiation portion 11a is held in a bent state. 1 heat exchanger 10 is completed. When the heat radiating portion 11a is cut and raised, for example, the shaft member 30 having a plurality of branch portions 31 is inserted between the straight portion 12c and the straight portion 12c of the tube 12, and each branch portion 31 corresponds to the heat radiating portion 11a. If the shaft member 30 is rotated in a state where it is disposed, the plurality of heat dissipating portions 11a can be simultaneously cut up, and productivity can be improved.

  In the heat exchanger 10 configured as described above, as shown in FIG. 2, for example, a fan unit 40 is disposed on the outer surface side of one fin plate 11, and a liquid is supplied to the tube 12 while the blower fan 41 is driven. , The heat of the liquid is released through the tube 12, the heat transfer part 11 c of the fin plate 11 and the heat dissipation part 11 a of the fin plate 11, and the liquid is cooled while passing through the tube 12. be able to.

  In this case, according to the heat exchanger 10, diffusion bonding is applied, and the tube 12 is bonded to the fin plate 11 via the flat surface 12 b of the tube 12, so that there is no interface between the tube 12 and the tube 12. The fin plate 11 can be integrated in a surface contact state. For this reason, the tube 12 and the fin plate 11 are joined together by brazing or applying an adhesive, or the electron beam or the like is applied between the tube 12 and the fin plate 11 as in the past. Compared to this, the heat exchange efficiency can be greatly improved. Moreover, since it is only necessary to heat and press between the fin plate 11 and the tube 12, it is not only easy to apply to a fine structure, but it is not necessary to consider the influence of deformation and stress due to high heat. There is no fear that the scope of application will be greatly limited.

  In the first embodiment described above, the manufactured heat exchanger 10 is used as it is, but for example, as shown in the modification of FIG. After the diffusion bonding, the heat exchanger 10 ′ may be configured by appropriately deforming the fin plate 11. According to this heat exchanger 10 ', it is possible to install it in a narrower place while securing a sufficient heat radiation amount.

  Further, in the first embodiment described above, the heat radiation part 11a formed on the fin plate 11 after the diffusion bonding of the tube 12 and the fin plate 11 is cut out in the out-of-plane direction along the slit 11d. It is not limited to this. For example, as shown in the modification of FIG. 8, a heat exchanger 10 ″ is formed by applying a fin plate 11 ′ in which the heat dissipating portion 11a ′ has been cut and raised in the out-of-plane direction in advance and diffusion-bonded to the tube 12. You may do it.

  Furthermore, as shown in the modification of FIG. 9, a fin plate 111 formed in a mountain shape is applied in advance, and an opening 111b is formed at the top of the portion 111a protruding in the mountain shape, and this is diffused and bonded to the tube 12 for heat. The exchanger 110 may be configured. In the case of the heat exchanger 110, the portion 111a protruding in a chevron shape becomes a heat radiating portion, but the length thereof is made sufficiently larger than that of the modified example of FIG. 8 to further improve the heat exchange efficiency. It becomes possible.

(Embodiment 2)
10 and 11 show a heat exchanger according to Embodiment 2 of the present invention. The heat exchanger 50 illustrated here is applied when a corrosive liquid (heat exchange medium) is cooled by air, as in the first embodiment, and circulates between the pair of fin plates 51 and the liquid. And a tube 52 for the purpose. The tube 52 is formed into a tubular shape from a material having corrosion resistance to the above-described liquid, such as stainless steel, Hastelloy (registered trademark), Inconel (registered trademark), or the like, and has a meandering shape. That is, in the second embodiment, the tube 52 having an “M” shape is applied by the four straight portions 52a and the three curved portions 52b connecting the straight portions 52a. The tube 52 is provided with flat surfaces 52c on the curved outer peripheral surface and the curved inner peripheral surface.

  On the other hand, the fin plate 51 is formed into a thin plate shape having a uniform plate thickness with a material having a high thermal conductivity, for example, copper. It is joined to each part which becomes a curved inner periphery. The fin plate 51 has a width of about 3 to 4 times the outer diameter of the tube 52 and has a length slightly shorter than the entire length of the tube 52. Each of the tubes 52 is joined to a substantially central portion in the width direction on the inner surface of the fin plate 51.

  On the other hand, each of the pair of fin plates 51 is provided with a plurality of heat radiation portions 51a. The heat dissipating part 51a is configured by cutting up both sides of a portion of the fin plate 51 joined to the tube 52 (hereinafter referred to as “heat transfer part 51b”), that is, a portion outside the joining region with the tube 52 to the outer surface side. It is a tongue-like part, and the fin F of the heat exchanger 50 is comprised by the heat-transfer part 51b. In the second embodiment, a plurality of rectangular heat dissipating portions 51 a having the same width and the same height are provided at the portions on both sides of the tube 52.

  12 and 13 sequentially show the manufacturing process of the heat exchanger 50 described above. Hereinafter, the manufacturing method of the heat exchanger 50 is demonstrated, referring these drawings suitably.

  First, as shown in FIG. 12, a pair of fin plates 51 and tubes 52 are prepared. In the fin plate 51, slits 51c are formed in advance on both sides of the fin plate 51 so as to cut out the heat radiating portion 51a. As the tube 52, a general tube having a circular cross section and a straight line is prepared.

  Next, the tube 52 is positioned between the pair of fin plates 51. Specifically, the tube 52 is positioned and arranged at the center in the width direction of the fin plate 51. Further, these are disposed in an inert gas atmosphere or in a vacuum, and heated and pressurized at a desired temperature and pressure to diffusely bond the fin plate 51 and the tube 52. In this case, the fin plate 51 and the tube 52 are joined to each other via the flat surface 52c by appropriately adjusting the pressure and deforming the tube 52 between the fin plates 51 in a flat shape.

  Here, even in the above-described diffusion bonding, several hundred sets of a pair of fin plates 51 and tubes 52 are prepared, and if these are arranged between pressure members and heated and pressurized, several hundreds at a time. A set can be manufactured, and productivity can be improved. In addition, it goes without saying that inclusions such as jigs and sheets for inhibiting diffusion bonding need to be arranged between the sets, that is, in the portions where the fin plates 51 directly face each other.

  Next, as shown in FIG. 13, the heat radiating portions 51a formed on the respective fin plates 51 are cut and raised in the out-of-plane direction along the slits 51c, and the heat radiating portions 51a are held in a bent state. In the case where the heat radiating portion 51a is cut up, similarly to the first embodiment, a plurality of branch portions provided on the shaft member (not shown) are arranged at positions corresponding to the heat radiating portions 51a of the fin plate 51, respectively. What is necessary is just to rotate a shaft member from this state.

  Finally, the tube 52 is appropriately bent so that the pair of fin plates 51 have a curved outer periphery and a curved inner periphery, and the tube 52 has a desired flow path shape, that is, four straight portions in the second embodiment. The heat exchanger 50 according to the second embodiment is completed by forming the "M" shape by the 52a and the three curved portions 52b connecting the straight portions 52a. In this case, since the tube 52 and each fin plate 51 are integrated by diffusion bonding, there is no fear that the tube 52 is peeled off even if the tube 52 is bent. Note that the flow path shape of the tube 52 does not necessarily have an “M” shape, and may be curved as many times as necessary according to the required heat dissipation amount.

  Also in the heat exchanger 50 configured as described above, if the liquid is circulated through the tube 52 with a blower fan (not shown) being driven, the heat of the liquid is transferred to the tube 52 and the heat transfer section 51b of the fin plate 51. And it will be discharged | emitted via the thermal radiation part 51a of the fin plate 51, and a liquid can be cooled while passing the tube 52. FIG.

  In this case, according to the heat exchanger 50, by applying diffusion bonding and further bonding to the fin plate 51 via the flat surface 52c of the tube 52, the tube 52 and the tube 52 can be formed without any interface therebetween. The fin plate 51 can be integrated in a state of surface contact. For this reason, it is possible to greatly improve the heat exchange efficiency as compared with the case where bonding is performed by applying brazing or an adhesive or the case where welding is performed by applying an electron beam or the like. Moreover, since it is only necessary to heat and press between the fin plate 51 and the tube 52, it is not only easy to apply to a fine structure, but also it is not necessary to consider the influence of deformation and stress due to high heat. There is no fear that the scope of application will be greatly limited.

  In addition, in Embodiment 1 mentioned above, a modification, and Embodiment 2, although all have illustrated the heat exchanger applied when the liquid which has corrosivity is cooled with air, it applies to other uses. Of course it doesn't matter. Further, although the tube and the fin plate are formed of different materials, they can be formed of the same material. For example, when emphasizing the overall corrosion resistance, the tube and the fin plate may be formed of stainless steel, respectively, or when it is not necessary to consider the corrosion resistance, the tube and the fin plate may be formed of copper.

  In addition, although one fin plate having a plurality of heat radiating portions is applied, a plurality of fins each provided with one heat radiating portion and one heat transfer portion may be joined to the outer peripheral surface of the tube. I do not care. Furthermore, although a tube is clamped between a pair of fin plates, it is not always necessary to provide two fin plates.

  Furthermore, since it is made to join with a fin via the flat surface of a tube, both contact areas can be increased and the heat exchange efficiency can be improved, but it is not necessary to provide a flat surface on the tube. Absent. In addition, when providing a flat surface in a tube, in Embodiment 1 and 2 mentioned above, although the pressurization force in the case of diffusion bonding is utilized, you may apply the tube which has a flat surface previously.

  As a method for increasing the contact area between the tube and the fin, for example, as shown in FIG. 14, a groove 61a having a circular arc cross section is formed in advance in a portion of the fin plate 61 where the tube 62 is disposed. The heat exchanger 60 may be manufactured by diffusion bonding in a state where the tube is in contact with the outer peripheral surface of the tube 62. According to this example, the contact area with the fin plate can be increased while the tube has a circular cross section.

  Further, as shown in FIG. 15, in the pressure jig J for diffusion bonding, a pressure groove Js having an arcuate cross section is formed in a portion corresponding to the tube 72, and fins are applied at the time of pressure during diffusion bonding. The heat exchanger 70 may be manufactured by deforming the plate 71 along the outer peripheral surface of the tube 72. In this example as well, the contact area with the fin plate 71 can be increased while the cross section of the tube 72 remains circular.

  In the first embodiment described above, one in which one side of the fin plate has a length of about 7 to 8 times the outer diameter of the tube is applied. In the second embodiment, the fin plate has an outer diameter of the tube. However, these specific numerical values are for illustrative purposes only, and other dimensions may be applied. Absent.

It is a top view which shows the heat exchanger which is Embodiment 1 of this invention. It is a side view of the heat exchanger shown in FIG. It is a disassembled perspective view which shows the state in the middle of manufacture of the heat exchanger shown in FIG. It is a decomposition | disassembly side view which shows the state in the middle of manufacture of the heat exchanger shown in FIG. It is a side view which shows the state in the middle of manufacture of the heat exchanger shown in FIG. It is a perspective view of the heat exchanger shown in FIG. It is a conceptual diagram which shows the method of manufacturing the modification of the heat exchanger shown in FIG. It is a conceptual diagram which shows the method of manufacturing the modification of the heat exchanger shown in FIG. It is a conceptual diagram which shows the modification of the heat exchanger shown in FIG. It is a top view which shows the heat exchanger which is Embodiment 2 of this invention. It is a cross-sectional view of the heat exchanger shown in FIG. The state in the middle of manufacture of the heat exchanger shown in FIG. 10 is shown, (a) is a top view, (b) is a side view. The state in the middle of manufacture of the heat exchanger shown in FIG. 10 is shown, (a) is a top view, (b) is a side view. It is the conceptual diagram which showed the example of the manufacturing method of the heat exchanger to which the method of increasing the contact area of a tube and a fin was applied. It is the conceptual diagram which showed the other example of manufacture of the heat exchanger to which the method of increasing the contact area of a tube and a fin is applied.

DESCRIPTION OF SYMBOLS 10 Heat exchanger 11 Fin plate 11a Heat radiation part 11b Ventilation hole 11c Heat transfer part 11d Slit 12 Tube 12b Flat surface 50 Heat exchanger 51 Fin plate 51a Heat radiation part 51b Heat transfer part 51c Slit 52 Tube 52c Flat surface 60,70 Heat exchange 61,71 Tube 61a Groove 62,72 Fin plate F Fin J Pressure jig Js Pressure groove

Claims (11)

  A heat exchanger comprising a tube for circulating a heat exchange medium and a fin for heat dissipation on an outer peripheral surface of the tube, wherein the fin and the tube are integrated by diffusion bonding.   The fin has a plate-shaped heat transfer portion and a plate-shaped heat dissipation portion protruding in an out-of-plane direction with respect to the heat transfer portion, and is joined to the tube via the heat transfer portion. The heat exchanger according to claim 1.   The heat exchanger according to claim 2, wherein the fin is provided with a plurality of heat radiating portions with respect to the heat transfer portion.   The heat exchanger according to claim 2, wherein the tube has a flat surface on an outer peripheral surface, and is joined to the heat transfer portion of the fin via the flat surface. In a method of manufacturing a heat exchanger comprising a tube for circulating a heat exchange medium and a fin for heat dissipation on the outer peripheral surface of the tube,
A step of diffusion bonding a fin plate having a flat plate shape wider than the outer diameter of the tube to the outer peripheral surface of the tube;
And a step of forming fins by bending a heat dissipating part outside the joining region with the tube to the heat transfer part joined to the outer peripheral surface of the tube in the fin plate. Manufacturing method of heat exchanger.   6. The method of manufacturing a heat exchanger according to claim 5, wherein the fin plate is diffusion bonded to a tube formed in a desired flow path shape in advance.   6. The method of manufacturing a heat exchanger according to claim 5, wherein after the fin plate is diffusion bonded to the tube, the tube is formed into a desired flow path shape.   6. The method of manufacturing a heat exchanger according to claim 5, wherein a tube having a circular cross-sectional shape is applied, and the tube is formed into a flat shape by pressure applied during diffusion bonding with the fin plate. .   The method for manufacturing a heat exchanger according to claim 5, wherein a slit for raising the heat radiating portion is formed in advance in the fin plate, and the fin plate is joined to the tube.   6. A groove having an arc-shaped cross section is formed in a portion of the fin plate where the tube is disposed, and both are diffusion-bonded in a state where the outer peripheral surface of the tube is in contact with the groove. A method for producing the heat exchanger according to 1.   In the pressure jig for diffusion bonding, a pressure groove having an arc-shaped cross section is formed in a portion corresponding to the tube, and the fin plate is deformed along the outer peripheral surface of the tube at the time of pressure during diffusion bonding. The method for manufacturing a heat exchanger according to claim 5, wherein:

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