JP2009216304A - Tube for heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily detect an unbrazed portion partially existing, in a tube for a heat exchanger having a joint face inside of the tube. <P>SOLUTION: In this tube for the heat exchanger in which a refrigerant is circulated, and which is constituted by placing two tabular sections 21, 22 in opposition to each other, the joint face joined by brazing is formed on a face of a tube inner side of at least one tabular section 21 of two tabular sections 21, 22, and a through-hole 31 penetrating through at least one tabular section 21 is formed on a part provided with the joint face of at least one tabular section 21. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heat exchanger tube used in a heat exchanger and into which a fluid for heat exchange flows, and is suitable for use in a condenser of a refrigeration cycle.

  Conventionally, as a heat exchanger tube, there is one in which plate-like portions constituting the tube are partially joined by brazing to form a plurality of flow paths inside the tube (see, for example, Patent Document 1).

  When the heat exchanger tube as described above is applied to a heat exchanger (for example, a condenser of a refrigeration cycle) in which a fluid flowing inside the tube is high pressure, pressure resistance and durability against repeated pressurization are required.

  Here, as an inspection method for guaranteeing the pressure resistance of the tube, there is a so-called static pressure inspection method in which the inside of the tube after brazing is pressurized with a predetermined pressure to inspect for the presence or absence of the brazed portion. In this static pressure inspection method, if there is an unbrazed portion inside the tube, the tube is expanded and deformed by pressurization at the unbrazed portion. This is an inspection method to check for the presence or absence of the above.

Further, as a test for guaranteeing durability against repeated pressurization of the tube, there is a pressurization repeating method in which pressurization with a predetermined test pressure is repeated.
JP 2004-3787 A

  By the way, if a part of the joint surface inside the tube is not brazed normally, depending on the size of the unbrazed area, there is sufficient strength against static pressure fracture, The situation that fatigue failure occurs by repeating.

  However, it is difficult to detect such a situation by visual inspection from the outside without disassembling the tube as in the static pressure inspection method and the pressure repetition method described above, and there is a problem that there is no effective inspection method. .

  In view of the above points, an object of the present invention is to make it possible to easily detect a partially brazed portion in a heat exchanger tube having a joining surface inside the tube.

  To achieve the above object, according to the first aspect of the present invention, the tube inner surface of at least one of the two plate-like portions (21, 22) is joined by brazing. A through-hole (31) penetrating the at least one plate-like portion (21) is provided at a portion of the at least one plate-like portion (21) where the joining surface is provided. It is characterized by being formed.

  According to this, when the joining surface of at least one plate-like portion (21) is not partially brazed, that is, when a partially unbrazed portion is present, a predetermined pressure is set inside the tube (11). When the inspection fluid is introduced, the inspection fluid leaks to the outside from the through hole (31), so that it is possible to detect a brazing failure. At this time, since it is not necessary to disassemble the tube (11), it is possible to easily detect a partially brazed portion.

  Further, as in the invention described in claim 2, the joining surface of at least one plate-like portion (21) is joined to the inner surface of the tube in the other plate-like portion (22) by brazing. Also good.

  Further, as in the invention described in claim 3, at least one plate-like portion (21) of the two plate-like portions (21, 22) will come into contact with the other plate-like portion (22). A substrate portion (24) to be attached and a protruding portion (25) protruding from the substrate portion (24) to the opposite side of the other plate-like portion (22) are formed. A flow path portion (26) through which a fluid flows is formed between the plate-like portion (22) and the surface of the substrate portion (24) that contacts the other plate-like portion (22) is the bonding surface. In addition, a through hole (31) may be formed in the substrate portion (24).

  Further, as in the invention described in claim 4, the two plate-like portions (21, 22) are respectively formed with the substrate portion (24) and the protruding portion (25), and the two plate-like portions are formed. A through hole (31) may be formed in each of the substrate portions (24) of (21, 22).

  Further, as in the invention described in claim 5, the through hole (31a) formed in the substrate portion (24) of one plate-like portion (21) of the two plate-like portions (21, 22), The through-hole (31b) formed in the substrate part (24) of the other plate-like part (22) is at least partially overlapped when viewed from the arrangement direction of the two plate-like parts (21, 22). It may be formed.

  Moreover, like the invention of Claim 6, the through-hole (31a) formed in the board | substrate part (24) of one plate-shaped part (21) among two plate-shaped parts (21, 22), The through hole (31b) formed in the substrate portion (24) of the other plate-like portion (22) is formed in the same shape, and from the arrangement direction of the two plate-like portions (21, 22). You may form so that it may overlap completely seeing.

  Moreover, like the invention of Claim 7, the through-hole (31a) formed in the board | substrate part (24) of one plate-shaped part (21) among two plate-shaped parts (21, 22), The through hole (31b) formed in the substrate portion (24) of the other plate-like portion (22) is formed so as not to overlap when viewed from the arrangement direction of the two plate-like portions (21, 22). Also good.

  In the invention according to claim 8, the two plate-like portions (21, 22) are formed with the substrate portion (24) and the protruding portion (25), respectively, and the two plate-like portions (21 22), the through hole (31) is formed only in the substrate part (24) of one plate-like part (22). According to this, since the through hole (31) is not formed in the substrate portion (24) of the other plate-like portion (21), the strength of the substrate portion (24) of the other plate-like portion (21) is increased. There is no decline. For this reason, when the board | substrate parts (24) of two plate-shaped parts (21, 22) are joined, it can suppress that the intensity | strength of a junction part falls.

  Moreover, in invention of Claim 9, in the site | part in which the joining surface in at least one plate-shaped part (21) is provided among two plate-shaped parts (21, 22), at least one plate-shaped part A cut-and-raised portion (27) formed by cutting and raising a part of (21) is provided, and at least one plate-like portion (21) is provided with a cut-and-raised portion (27) to provide a through hole. (31) is formed. According to this, it is possible to increase the heat transfer coefficient between the inner fin (3) and the fluid by colliding the fluid flowing on the surface of the inner fin (3) with the cut and raised portion (35) to disturb the flow of the fluid. It becomes possible.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing the overall structure of a heat exchanger 10 to which a heat exchanger tube according to the present invention is applied.

  As shown in FIG. 1, the heat exchanger 10 condenses the refrigerant by exchanging heat between the high-temperature and high-pressure refrigerant discharged from the compressor (not shown) of the refrigeration cycle and the air. Specifically, it has a heat exchanging portion 13 composed of a combination of a plurality of flat tubes 11 constituting a refrigerant passage through which a refrigerant flows and a plurality of corrugated fins (hereinafter abbreviated as fins) 12. The tank portions 14 and 15 are arranged at both ends in the tube longitudinal direction.

  The tank parts 14 and 15 perform distribution and collection of the refrigerant with respect to the tube 11. Side plates 16, 17 that hold the rectangular outer shape of the heat exchanger 10 by connecting the tank portions 14, 15 are arranged in parallel with the tube 11 at both longitudinal ends of the tank portions 14, 15. ing. The plurality of tubes 11, the plurality of fins 12, and the two tank portions 14 and 15 are joined by integral brazing.

  Both tank parts 14 and 15 are cylindrical containers made of an aluminum-based material clad (coated) with a brazing material (a filler metal). Both end portions of the plurality of tubes 11 are inserted into both tank portions 14 and 15 from a plurality of insertion holes (not shown) formed side by side in the longitudinal direction of both tank portions 14 and 15.

  An inlet pipe for introducing a high-temperature and high-pressure refrigerant discharged from a compressor (not shown) in the refrigeration cycle into one end of the tank portion 14 in the longitudinal direction (the lower end side in FIG. 1). A connection block 14a to which (not shown) is connected is joined by brazing. An engagement protrusion 14b for attaching the heat exchanger 10 to the vehicle body is provided at one end in the longitudinal direction of one tank portion 14 (lower end in FIG. 1).

  An outlet pipe (not shown) for allowing the liquid-phase refrigerant to flow from the inside of the tank to the expansion valve (not shown) side of the refrigeration cycle is provided at one end of the other tank portion 15 in the longitudinal direction (upper end side in FIG. 1). Are connected by brazing. An engagement protrusion 15b for attaching the heat exchanger 10 to the vehicle body is provided at the other longitudinal end portion (the lower end portion in FIG. 1) of the other tank portion 15.

  FIG. 2 is a perspective view including a cross section orthogonal to the refrigerant flow direction of the tube 11 in the first embodiment. As shown in FIG. 2, the tube 11 has a refrigerant flowing in the tube longitudinal direction X, and the shape of the tube 11 in a cross section orthogonal to the tube longitudinal direction X is an elongated, substantially flat shape.

  The tube 11 is comprised by the plate-shaped member of uniform board thickness. Specifically, the tube 11 is formed by, for example, bending a single plate-like member having a predetermined thickness at the center portion so that the first plate-like portion 21 and the second plate-like portion 22 are parallel in the minor axis direction Y. The crimping portion 23 is formed at one end portion in the major axis direction Z so as to face each other. In addition, you may form the tube 11 not only with one plate-shaped member but with two plate-shaped members.

  On the first and second plate-like portions 21 and 22 facing each other, a flat substrate portion 24 and a protruding portion 25 that protrudes outward from the substrate portion 24 are formed. And the board | substrate parts 24 of the 1st, 2nd plate-shaped parts 21 and 22 contact | abut and are brazed, and space is between the protrusion parts 25 of the 1st, 2nd plate-shaped parts 21 and 22. FIG. A refrigerant flow path portion 26 through which the refrigerant flows is constituted by the protruding portions 25 formed and opposed to each other. In the present embodiment, the portion where the substrate portions 24 are in contact with each other and brazed and the refrigerant flow passage portion 26 extend in parallel to the tube longitudinal direction X. A plurality of substrate portions 24 and protrusions 25 are alternately arranged in the major axis direction Z. The inner surface of the substrate part 24, that is, the surface of the substrate part 24 to which the other substrate part 24 is bonded corresponds to the bonding surface of the present invention.

  The substrate portion 24 and the protruding portion 25 are formed by punching out the portion that becomes the protruding portion 25 of the plate-like member that forms the tube 11 rather than the portion that becomes the substrate portion 24. In contrast to this, the substrate portion 24 and the protruding portion 25 may be formed by punching out a portion that becomes the substrate portion 24 of the plate-like member forming the tube 11.

  A through hole 31 penetrating the substrate portion 24 is formed in the substrate portion 24 of the tube 11. A plurality of through holes 31 are arranged along the tube longitudinal direction X. Each through-hole 31 is an elongated rectangle and is formed extending along the tube longitudinal direction X. The through hole 31 is configured by punching out the substrate portion 24.

  FIG. 3 is a cross-sectional view taken along the line AA of FIG. As shown in FIG. 3, the through holes 31 are formed in the substrate portions 24 of the first and second plate-like portions 21 and 22, respectively. A through hole 31 (hereinafter referred to as a first through hole 31a) formed in the substrate portion 24 of the first plate-like portion 21 is a through-hole 31 (hereinafter referred to as a first through-hole 31) formed in the substrate portion 24 of the second plate-like portion 22. 2) and the same shape. Further, the first through hole 31a and the second through hole 31b are disposed so as to completely overlap when viewed in the minor axis direction Y, that is, the arrangement direction of the first and second plate-like portions 21 and 22.

  Next, an inspection method for assuring the product quality (pressure resistance and durability against repeated pressurization) of the tube 11 in this embodiment will be described.

  As an inspection method for assuring the pressure resistance of the tube, there is a static pressure inspection method described in the above background art section. Moreover, as a test | inspection which ensures the durability with respect to the repeated pressurization of a tube, there exists a pressurization repeated method demonstrated in the column of the said background art. In both the static pressure inspection method and the pressure repetition method, the inside of the tube 11 is pressurized by introducing a test fluid having a predetermined pressure into the tube 11.

  FIG. 4 is an enlarged cross-sectional view showing a cross section orthogonal to the refrigerant flow direction of the tube 11 in the first embodiment, where (a) shows a state in which brazing is normally performed, and (b) The state where the brazing defect has occurred partially is shown.

  As shown in FIG. 4A, when the substrate portions 24 of the first and second plate-like portions 21 and 22 are normally brazed, a test fluid having a predetermined pressure is introduced into the tube 11. However, since the through hole 31 is closed by the brazing material 40, the inspection fluid does not leak to the outside. On the other hand, as shown in FIG. 4B, when the substrate portions 24 of the first and second plate-like portions 21 and 22 are not partially brazed, the inspection fluid leaks from the through hole 31 to the outside. This makes it possible to detect a brazing failure.

  As described above, by forming the through hole 31 in the substrate portion 24 that forms the joint surface inside the tube 11, the substrate portions 24 are not partially brazed, that is, partially unbrazed portions. In the case where the test fluid exists, the inspection fluid leaks from the through hole 31 to the outside, so that a brazing failure can be detected. At this time, since it is not necessary to disassemble the tube 11, it is possible to easily detect a partially brazed portion.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  FIG. 5 is an enlarged cross-sectional view showing a cross section orthogonal to the refrigerant flow direction of the tube 11 in the second embodiment, and corresponds to FIG. As shown in FIG. 5, the through-hole 31 is provided only in the board | substrate part 24 of one plate-like part (this embodiment 2nd plate-like part 22) among the 1st, 2nd plate-like parts 21 and 22. As shown in FIG. ing. That is, in the present embodiment, the through hole 31 is not provided in the substrate portion 24 of the first plate-like portion 21. For this reason, the intensity | strength of the board | substrate part 24 of the 1st plate-shaped part 21 does not fall. Therefore, in this embodiment, in addition to the same effects as those of the first embodiment, when the substrate portions 24 of the first and second plate-like portions 21 and 22 are brazed and joined, the strength of the joined portion is reduced. Can be suppressed.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  FIG. 6 is a perspective view including a cross section orthogonal to the refrigerant flow direction of the tube 11 in the third embodiment. As shown in FIG. 6, the first through hole 31 a and the second through hole 31 b partially overlap each other when viewed from the minor axis direction Y, that is, from the arrangement direction of the first and second plate-like parts 21 and 22. Is arranged. As a result, it is possible to obtain the same effect as that of the first embodiment.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  FIG. 7 is a perspective view including a cross section orthogonal to the refrigerant flow direction of the tube 11 in the fourth embodiment. As shown in FIG. 7, the first through hole 31 a and the second through hole 31 b are arranged so as not to overlap each other when viewed from the minor axis direction Y, that is, from the arrangement direction of the first and second plate-like portions 21 and 22. Has been. As a result, it is possible to obtain the same effect as that of the first embodiment.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  FIG. 8 is an enlarged perspective view including a cross section orthogonal to the refrigerant flow direction of the tube 11 in the fifth embodiment. As shown in FIG. 8, a plurality of cut-and-raised portions 27 are formed on the substrate portions 24 of the first and second plate-like portions 21 and 22 by cutting and raising a part of the substrate portion 24. As a result of the plurality of cut-and-raised portions 27 being formed, a plurality of slit-shaped openings 31 are formed in the substrate portion 24. The slit-shaped opening 31 corresponds to the through hole of the present invention.

  Each cut-and-raised portion 27 is an elongated rectangle and has a shape that can be called a band shape. Each cut-and-raised portion 27 is formed to extend along the tube longitudinal direction X, that is, the refrigerant flow direction. In the present embodiment, each cut-and-raised portion 27 is connected to the substrate portion 24 at one long side end.

  In the present embodiment, in addition to the same effects as in the first embodiment, air flowing on the tube 11, that is, the outer surface of the substrate portion 24, collides with the cut-and-raised portion 27, and the air flowing on the outer surface of the substrate portion 24 is The heat transfer coefficient between the tube 11 and air can be increased by disturbing the flow. Therefore, the heat exchange performance of the heat exchanger 10 can be improved.

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described with reference to FIG. The same parts as those in the fifth embodiment are denoted by the same reference numerals and description thereof is omitted.

  FIG. 9 is an enlarged perspective view including a cross section orthogonal to the refrigerant flow direction of the tube 11 in the sixth embodiment. As shown in FIG. 9, each cut-and-raised portion 27 is connected to the substrate portion 24 of the first and second plate-like portions 21 and 22 at one short side end portion. Thereby, it is possible to obtain the same effect as that of the fifth embodiment.

(Other embodiments)
In each of the above-described embodiments, the tube 11 includes a flat substrate portion 24 on the first and second plate-like portions 21 and 22 facing each other, and a protruding portion 25 that protrudes outward from the substrate portion 24. Although the example comprised by abutting and brazing joining the board | substrate parts 24 of the 1st, 2nd plate-shaped parts 21 and 22 while having formed was demonstrated, not only this but a tube is the outer shell of a tube You may comprise from the cylindrical member which comprises these, and the inner fin which is provided in a cylindrical member and increases the heat transfer area with a refrigerant | coolant. In this case, what is necessary is just to form the through-hole which penetrates a cylindrical member in the surface joined to the inner fin in a cylindrical member.

  Moreover, although the said 1st-4th embodiment demonstrated the example which formed the through-hole 31 by punching out the board | substrate part 24, it is not restricted to this, The through-hole 31 is formed by giving a burring process to the board | substrate part 24. It may be formed.

  Further, in each of the above embodiments, the example in which the heat exchanger according to the present invention is applied to the condenser of the refrigeration cycle has been described. However, the present invention is not limited thereto, and is applied to various heat exchangers such as a radiator, a heater core unit, and an evaporator. May be. In this case, a fluid other than the refrigerant may be used as the fluid.

  Moreover, you may combine each said embodiment suitably in the possible range besides the above-mentioned range.

It is a perspective view showing the whole heat exchanger 10 composition by a 1st embodiment. It is a perspective view containing the cross section orthogonal to the refrigerant | coolant distribution direction of the tube 11 in 1st Embodiment. It is AA sectional drawing of FIG. It is an expanded sectional view which shows the cross section orthogonal to the refrigerant | coolant distribution direction of the tube 11 in 1st Embodiment, (a) has shown the state in which brazing is performed normally, (b) is brazing partially It shows a state where a defect has occurred. It is an expanded sectional view which shows the cross section orthogonal to the refrigerant | coolant distribution direction of the tube 11 in 2nd Embodiment. It is a perspective view containing the cross section orthogonal to the refrigerant | coolant distribution direction of the tube 11 in 3rd Embodiment. It is a perspective view containing the cross section orthogonal to the refrigerant | coolant distribution direction of the tube 11 in 4th Embodiment. It is an expansion perspective view containing the cross section orthogonal to the refrigerant | coolant distribution direction of the tube 11 in 5th Embodiment. It is an expansion perspective view containing the cross section orthogonal to the refrigerant | coolant distribution direction of the tube 11 in 6th Embodiment.

Explanation of symbols

21 First plate-like part 22 Second plate-like part 24 Substrate part 25 Projection part 26 Channel part (refrigerant channel part)
27 Cut and raised part 31 Through hole

Claims (9)

While the fluid flows inside, the two plate-like parts (21, 22) are arranged to face each other, a heat exchanger tube,
The surface on the tube inner side of at least one of the two plate-like portions (21, 22) has a joining surface joined by brazing,
A through hole (31) penetrating the at least one plate-like portion (21) is formed in a portion of the at least one plate-like portion (21) where the joining surface is provided. Tube for heat exchanger.   The heat according to claim 1, wherein the joining surface of the at least one plate-like portion (21) is joined to a surface on the tube inner side of the other plate-like portion (22) by brazing. Tube for exchanger. Of the two plate-like portions (21, 22), at least one plate-like portion (21) is in contact with the other plate-like portion (22) and brazed, and the substrate A protruding portion (25) having a shape protruding from the portion (24) to the opposite side to the other plate-shaped portion (22),
Between the protruding portion (25) and the other plate-like portion (22), a flow path portion (26) through which the fluid flows is configured,
The surface in contact with the other plate-like portion (22) in the substrate portion (24) is the joining surface, and the through-hole (31) is formed in the substrate portion (24). The tube for heat exchangers according to claim 1 or 2. The two plate-like portions (21, 22) are formed with the substrate portion (24) and the protruding portion (25), respectively.
The tube for a heat exchanger according to claim 3, wherein the through hole (31) is formed in each of the substrate portions (24) of the two plate-like portions (21, 22).   Of the two plate-like portions (21, 22), the through hole (31a) formed in the substrate portion (24) of one plate-like portion (21) and the plate-like portion (22) of the other plate-like portion (22). The through hole (31b) formed in the substrate part (24) is formed so that at least a part thereof overlaps when viewed from the arrangement direction of the two plate-like parts (21, 22). The heat exchanger tube according to claim 4.   Of the two plate-like portions (21, 22), the through hole (31a) formed in the substrate portion (24) of one plate-like portion (21) and the plate-like portion (22) of the other plate-like portion (22). The through hole (31b) formed in the substrate part (24) is formed in the same shape, and completely overlaps when viewed from the arrangement direction of the two plate-like parts (21, 22). The heat exchanger tube according to claim 4 or 5, wherein the heat exchanger tube is formed.   Of the two plate-like portions (21, 22), the through hole (31a) formed in the substrate portion (24) of one plate-like portion (21) and the plate-like portion (22) of the other plate-like portion (22). The said through-hole (31b) formed in a board | substrate part (24) is formed so that it may not overlap seeing from the arrangement direction of said two plate-shaped part (21, 22). 5. A heat exchanger tube according to 4. The two plate-like portions (21, 22) are formed with the substrate portion (24) and the protruding portion (25), respectively.
The said through-hole (31) is formed only in the said board | substrate part (24) of one plate-shaped part (22) among the said two plate-shaped parts (21, 22). A tube for a heat exchanger as described in 1. Cut out a part of the at least one plate-like portion (21) at a portion corresponding to the joining surface in at least one of the two plate-like portions (21, 22). A cut-and-raised part (27) formed by
The said at least one plate-like part (21) has the said through-hole (31) by providing the said cut-and-raised part (27), The any one of Claim 1 thru | or 8 characterized by the above-mentioned. A tube for a heat exchanger as described in 1.

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