JP2006308144A - Jointing structure of header tank and tube in heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a jointing structure of a header tank and a tube in a heat exchanger capable of reducing clogging caused by residual brazing filler material, and easily positioning the tube. <P>SOLUTION: A projecting portion 13 having the recessed cross-sectional shape is formed on an end portion of the tube 5, and a tip of the projecting portion 13 is kept into contact with a support portion 12a of the header tank 4 to be jointed by brazing. As a distance for the residual brazing filler material to reach a refrigerant passage hole 25 is elongated, and a comparatively wide space is secured as a communication passage 16, the refrigerant passage hole 25 and the communication passage 16 are hardly clogged by the brazing filler material. As the end portion of the tube 5 is uniformly kept into contact with the support portion 12a formed on a partition 12 of the header tank 4, the tube 5 can be easily and stably positioned. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a joining structure between a header tank and a tube of a heat exchanger used in, for example, a vehicle, and more particularly to a technique effective when joining a header tank having a multi-hole structure and a flat tube.

  Conventionally, in a heat exchanger using carbon dioxide gas as a refrigerant, a multi-hole header tank is often used to satisfy high pressure resistance. The multi-hole structure header tank is provided with a plurality of flow paths for allowing fluid to pass through partition walls inside a header tank formed of an extruded material. In such a header tank, a cutting surface is formed on the multi-hole tube wall constituting the header tank, and the tube is positioned by abutting the end of the tube there (see Patent Document 1).

In the above structure, in order to allow the refrigerant to flow smoothly when the header tank and the tube are joined, the end of the tube hole is widened by cutting the tube end into a wedge shape. Are known. Further, there is known a structure in which a tube contact surface on the header tank side is partly cut to form a communication hole so that the tube can be easily positioned without impairing the refrigerant flow (see Patent Document 2). .
Special table 2001-52551 gazette JP 2002-139293 A

  In the heat exchanger with high pressure resistance as described above, extruded material is often used for both the header tank and the tube. In this case, the connection method is to supply brazing material to each contact surface and braze in the furnace. It is common to use a technique (placer) that integrates by doing so. However, in a heat exchanger that can be assembled by inserting a large number of tubes into the header tank, it is difficult to supply an appropriate amount of brazing material to all brazing locations, and a large amount of brazing material is supplied to reduce unjoined locations. I was responding. For this reason, brazing is likely to occur in the tube hole or the communication passage in the header tank due to the surplus brazing material, leading to a decrease in heat exchange performance and an increase in passage resistance.

  An object of the present invention is to provide a joining structure between a header tank and a tube of a heat exchanger that reduces brazing of excess brazing material.

  Another object of the present invention is to provide a joint structure between a header tank and a tube of a heat exchanger that can easily position the tube.

  The invention according to claim 1 includes a plurality of tubes in which a plurality of refrigerant passage holes are formed, fins disposed between the stacked tubes, and a header tank communicated and joined to an end portion of the tubes. A header tank and a tube joining structure of a heat exchanger provided, wherein the header tank has a tube insertion hole into which the tube is inserted, and a plurality of refrigerants extending in the longitudinal direction of the header tank and extending inside the tank. A partition that forms a flow path, and a support column that is formed in the partition and comes into contact with the end of the tube inserted from the tube insertion hole, and has a protruding section having a concave cross section at the end of the tube In addition, the tip of the protrusion is brought into contact with the support column of the header tank to be brazed and joined.

  The invention according to claim 2 is characterized in that, in claim 1, the protruding portion is provided with a notch except for a portion where the protruding portion abuts on the support column and both end portions in the tube width direction. Is.

  The invention of claim 3 is the tube according to claim 1, wherein the tube is a tube in which a corrugated inner fin is inserted into a flat tube, and the tip of the inner fin is separated from the end of the tube. A protruding portion is formed.

  The invention of claim 4 includes a plurality of tubes in which a plurality of refrigerant passage holes are formed, fins disposed between the stacked tubes, and a header tank that is connected to the end portion of the tubes. A header tank and a tube joining structure of the heat exchanger, wherein the header tank includes a tube insertion hole into which the tube is inserted, and a plurality of refrigerant flows in the tank extending in a longitudinal direction of the header tank. A partition that forms a path; and a support column that is formed in the partition and is in contact with an end of the tube inserted from the tube insertion hole, and the end of the tube and the support column A positioning member that separates them at a predetermined interval is provided.

  According to a fifth aspect of the present invention, in the fourth aspect, the positioning member is a positioning pin provided with a step for positioning, and a tip of the positioning pin inserted into the predetermined coolant passage hole is brought into contact with the support column. By doing so, the end portion of the tube and the support column portion are separated at a predetermined interval.

  According to a sixth aspect of the present invention, in the fourth aspect, a pin insertion hole having a predetermined depth is formed in the end of the tube in the vicinity of the refrigerant passage hole, and the positioning member is a positioning pin having a predetermined length. The positioning pin is inserted into the pin insertion hole to cause the positioning pin to protrude from the end of the tube by a predetermined length, and the tip of the positioning pin is brought into contact with the support column to The end portion and the column portion are spaced apart from each other at a predetermined interval.

  According to a seventh aspect of the present invention, in the fourth aspect, a slit having a predetermined depth is formed between the adjacent refrigerant passage holes at the end of the tube, and the positioning member is a positioning plate having a predetermined length. The end of the tube by inserting the positioning plate into the slit so that the positioning plate protrudes from the end of the tube by a predetermined length, and the tip of the positioning plate is brought into contact with the support column. And the column portion are separated at a predetermined interval.

  The invention according to claim 8 is the positioning plate according to claim 4, wherein a slit having a predetermined depth is formed at an end portion of the tube and at an outermost portion in the tube width direction, and the positioning member has a predetermined length. The positioning plate is inserted into the slit so that the positioning plate protrudes from the end portion of the tube by a predetermined length, and the tip of the positioning plate is brought into contact with the bottom surface portion of the opposing coolant channel. The end portion of the tube and the support column portion are separated at a predetermined interval.

  The invention of claim 9 is characterized in that, in any one of claims 7 and 8, the positioning plate is chamfered in a tapered shape toward the tip.

  A tenth aspect of the present invention is the positioning plate according to the fourth aspect, wherein the positioning member is a positioning plate formed in a concave cross section, the bottom surface portion of the positioning plate is brought into contact with the support column portion, and both side edge portions are By abutting against the end portion of the tube, the end portion of the tube and the support column portion are separated at a predetermined interval.

  According to an eleventh aspect of the present invention, in the tenth aspect of the present invention, openings are provided on both side edge portions of the positioning plate except for a portion where the both side edge portions are in contact with the support column portion.

  A twelfth aspect of the invention is characterized in that, in any one of the tenth and eleventh aspects, the positioning plate is formed in a tapered shape from the side edge portions toward the bottom surface portion.

  The invention of claim 13 includes a plurality of tubes in which a plurality of refrigerant passage holes are formed, fins disposed between the stacked tubes, and a header tank communicated and joined to an end portion of the tubes. A header tank and a tube joining structure of the heat exchanger, wherein the header tank includes a tube insertion hole into which the tube is inserted, and a plurality of refrigerant flows in the tank extending in a longitudinal direction of the header tank. A partition wall that forms a path, and a support column that is formed in the partition wall and that abuts against an end portion of the tube that is inserted from the tube insertion hole, with one outer wall remaining at a constant thickness at the end portion of the tube. The abutting portion is formed, and the leading end of the abutting portion is brought into contact with the column portion of the header tank to be brazed and joined.

  According to a fourteenth aspect of the present invention, in the thirteenth aspect, on the refrigerant inlet side of the tube, the outer wall of the abutting portion is the downstream side with respect to the refrigerant flow direction in the refrigerant flow path, and the refrigerant outlet side of the tube Then, the outer wall of the abutting portion is upstream of the refrigerant flow direction in the refrigerant flow path.

  A fifteenth aspect of the invention is characterized in that, in the thirteenth or fourteenth aspect, a cutout portion is provided on the outer wall of the abutting portion except for a portion where the outer wall abuts against a column portion of the header tank. To do.

  The invention of claim 16 includes a plurality of tubes in which a plurality of refrigerant passage holes are formed, fins disposed between the stacked tubes, and a header tank that is connected to the end portion of the tubes. A header tank and a tube joining structure of the heat exchanger, wherein the header tank includes a tube insertion hole into which the tube is inserted, and a plurality of refrigerant flows in the tank extending in a longitudinal direction of the header tank. A partition that forms a path; and a column that is formed in the partition and that abuts against an end of the tube that is inserted from the tube insertion hole, and the tube has one outer peripheral surface that contacts the inner wall of the tube insertion hole A groove portion is formed in the tube, and an end portion of the tube is brought into contact with the support column portion of the header tank to be joined by brazing.

  According to a seventeenth aspect of the present invention, in the end portion of the tube according to the sixteenth aspect, groove portions are formed on both outer peripheral surfaces in contact with the inner wall of the tube insertion hole.

  According to an eighteenth aspect of the present invention, a groove is formed in the end portion of the tube according to the sixteenth aspect over the entire outer periphery contacting the inner wall of the tube insertion hole.

  The invention of claim 19 is characterized in that, in any one of claims 16 to 18, the groove is formed inside the header tank rather than the thinnest part of the header tank to be brazed to the tube. To do.

  The invention according to claim 20 includes a plurality of tubes in which a plurality of refrigerant passage holes are formed, fins disposed between the stacked tubes, and a header tank that is in communication with an end portion of the tubes. A header tank and a tube joining structure of the heat exchanger, wherein the header tank includes a tube insertion hole into which the tube is inserted, and a plurality of refrigerant flows in the tank extending in a longitudinal direction of the header tank. A partition that forms a path; and a support column that is formed in the partition and contacts the end of the tube inserted from the tube insertion hole. The end of the tube is brought into contact with the support column of the header tank and brazed and joined.

  The invention of claim 21 is characterized in that, in claim 20, the slit portion penetrates in the thickness direction of the tube.

  According to a twenty-second aspect of the present invention, in the twentieth aspect, the slit portion penetrates in the width direction of the tube.

  The invention of claim 23 includes a plurality of tubes in which a plurality of refrigerant passage holes are formed, fins disposed between the stacked tubes, and a header tank that is in communication with an end portion of the tubes. The header tank of the heat exchanger has a joining structure with a tube, and the header tank includes a tube insertion hole in which a plurality of grooves are formed in an inner wall, and a plurality of the inside of the tank extending in the longitudinal direction of the header tank. A partition wall that forms a refrigerant flow path of the tube, and a support column that is formed in the partition wall and contacts the end of the tube inserted through the tube insertion hole, and the end of the tube is connected to the support column of the header tank It is characterized in that it is brought into contact with the portion and brazed.

  According to the first aspect of the present invention, the distance from the brazing material supply point to the opening surface of the coolant passage hole is increased, and the solder that has melted from the brazing material supply point moves to the communication path side while going around the outer periphery of the protruding portion. Therefore, it is difficult for excessive wax to reach the refrigerant passage hole. Further, since the protruding portion has a relatively large communication passage space, the wax that has entered the communication passage is less likely to be sucked into the refrigerant passage hole. Therefore, the refrigerant passage hole and the communication passage are less likely to be clogged by excessive wax, and it is possible to prevent a decrease in heat exchange performance and an increase in passage resistance. Moreover, since it is the structure which makes the edge part of a tube contact | abut to the support | pillar part of a header tank equally, a tube can be positioned easily and stably.

  According to the invention of claim 2, since the protruding portion formed at the end portion of the tube is provided with the cutout portion except for the portion where the protruding portion is in contact with the support column portion and both end portions in the tube width direction. The passage resistance in the flow path can be reduced.

  According to the invention of claim 3, it is possible to form the protruding portion having a concave cross section without processing the end portion of the tube by cutting or the like.

  According to the invention of claim 4, since the solder that has melted from the brazing material supply portion during brazing flows through the positioning member and flows into the support column side, the refrigerant passage hole is less likely to be clogged with the surplus brazing. Become. Further, since the gap formed between the end portion of the tube and the column portion is a relatively wide space, the wax that has flowed into the column portion side is hardly sucked into the refrigerant passage hole. In addition, since the positioning member does not enter the refrigerant flow path, it is possible to prevent an increase in passage resistance in the refrigerant flow path. Therefore, it is possible to prevent a decrease in heat exchange performance and an increase in passage resistance due to wax clogging in the space serving as the refrigerant passage hole and the communication passage.

  According to the fifth aspect of the present invention, since the structure is such that the positioning pins provided at the end portions of the tubes are brought into contact with the column portions of the header tank at equal intervals, the tubes can be positioned easily and stably. Further, by adjusting the position of the step in the positioning pin, the gap between the end of the tube and the column can be easily set. Furthermore, it is not necessary to form a notch or the like at the end of the tube, and the existing tube can be used as it is.

  According to the sixth aspect of the present invention, since the refrigerant passage hole of the tube is not sacrificed for installing the positioning pin, more refrigerant can be flowed.

  According to the seventh aspect of the present invention, since the positioning plate is simply inserted into the slit, the positioning member can be installed with relatively simple processing compared to the case where the insertion hole or the like is formed at the end of the tube. .

  According to the eighth aspect of the present invention, in the outermost portion in the width direction of the tube, the flow of the wax is prevented by the positioning plate, so that the coolant passage hole formed in the outermost portion in the width direction of the tube is particularly blocked. Can be effectively prevented. Moreover, since members such as pins and plates do not exist in the communication path formed by the gap, the flow of the refrigerant between the refrigerant flow paths can be made smooth. Therefore, in the present invention, it is possible to prevent a decrease in heat exchange performance and an increase in passage resistance due to the clogging of the refrigerant passage hole located at the outermost side in the tube width direction. Moreover, since it is a structure which only inserts a positioning plate in a slit, a positioning member can be installed by comparatively simple process compared with the case where an insertion hole etc. are formed in the edge part of a tube. Further, since the refrigerant passage hole of the tube is not sacrificed for installing the positioning plate, more refrigerant can be flowed. In addition, since the positioning plate provided at the end of the tube is in contact with the bottom surface of the coolant channel at equal intervals, the tube can be positioned easily and stably. Furthermore, by adjusting the depth of the slit, the gap between the end portion of the tube and the column portion can be easily set.

  According to the ninth aspect of the present invention, the tube can be easily inserted into the header tank by chamfering the positioning plate toward the tip, so that the workability can be improved. .

  According to the invention of claim 10, the solder that has melted from the brazing material supply location during brazing is sucked into the outer peripheral portion of the positioning plate, which is a positioning member, and less flows into the communication path side. This makes it difficult for the coolant passage hole to be clogged with wax. Further, since the space of the communication path by the positioning plate is relatively wide, even if wax enters the communication path, it is difficult to be sucked into the refrigerant path hole. Therefore, the refrigerant passage hole and the communication passage are less likely to be clogged by excessive wax, and it is possible to prevent a decrease in heat exchange performance and an increase in passage resistance. In addition, since the positioning plate installed on the upper surface of the support column is in contact with the end of the tube, the tube can be positioned easily and stably. Further, by adjusting the height of the positioning plate, the gap between the end portion of the tube and the column portion can be easily set.

  According to the eleventh aspect of the present invention, since the openings are provided on both side edges of the positioning plate except for the portions that abut the header tank struts, the passage resistance in the refrigerant flow path can be reduced. .

  According to the twelfth aspect of the present invention, the tip of the positioning plate is easily inserted into the header tank by forming the positioning plate so as to be tapered from both side edge portions to the bottom surface portion, thereby improving workability. can do. Furthermore, since a gap serving as a wax pool can be formed in the outer peripheral portion of the positioning plate, excess wax can be accumulated in this gap.

  According to the invention of claim 13, since the communication passage formed between the end portion of the tube and the column portion becomes a relatively wide space, excess wax is accumulated in the communication passage, and the refrigerant passage hole is It becomes difficult to clog wax. Further, since the communication path is a relatively wide space, the interior is not blocked by excessive wax, and the flow rate distribution between the refrigerant flow paths can be made uniform. Therefore, it is possible to prevent a decrease in heat exchange performance and an increase in passage resistance due to the clogging of the refrigerant passage hole and the communication passage. In addition, since the abutting portion provided at the end portion of the tube is in contact with the column portion of the header tank at equal intervals, the tube can be easily and stably positioned. Moreover, the clearance gap between the edge part of a tube and a support | pillar part can be easily set by adjusting the height of an abutting part.

  According to the invention of claim 14, on the refrigerant inlet side of the tube, the outer wall of the abutting portion is on the downstream side with respect to the refrigerant flow direction in the refrigerant flow path, and on the refrigerant outlet side, the outer wall of the abutting portion is the refrigerant flow. By setting so that it may become an upstream with respect to the refrigerant | coolant flow direction in a path | route, the flow of a refrigerant | coolant becomes smooth and the passage resistance in a refrigerant | coolant flow path can be reduced.

  According to the fifteenth aspect of the present invention, since the cutout portion is provided on the outer wall of the protruding portion except for the portion in contact with the column portion of the header tank, the passage resistance in the refrigerant flow path can be reduced. .

  According to the sixteenth aspect of the present invention, surplus wax that has melted from the brazing material supply location is accumulated in a gap formed between the inner wall of the tube insertion hole and the groove, and the surplus brazing causes the refrigerant passage hole and the communication path to be formed. Since it becomes difficult to clog wax, it is possible to prevent a decrease in heat exchange performance and an increase in passage resistance. In addition, since the abutting portion formed at the end portion of the tube is in contact with the column portion of the header tank at equal intervals, the tube can be easily and stably positioned.

  According to the invention of claim 17, since the groove portions are formed on both sides of the outer periphery contacting the inner wall of the tube insertion hole at the end portion of the tube, the wax flowing from the side opposite to the oblique side is accumulated in the groove portion on the back side, It becomes possible to accumulate the wax on both sides of the tube, and it is possible to make it difficult for excess wax to be sucked into the refrigerant passage hole.

  According to the invention of claim 18, since the groove portion is formed over the entire circumference of the outer periphery contacting the inner wall of the tube insertion hole at the end portion of the tube, the wax flowing from the outermost side in the tube width direction, which is likely to clog the wax, is formed in the groove portion It becomes possible to accumulate, and it is possible to make it difficult for excessive wax to be sucked into the refrigerant passage hole.

  According to the nineteenth aspect of the present invention, it is considered that the pressure resistance performance of the joint portion is lowered if the groove portion is not filled with the wax in the thinnest portion of the header tank. In addition to eliminating wax clogging, it is possible to maintain pressure resistance against high-pressure refrigerant.

  According to the twentieth aspect of the present invention, the excessive wax melted from the brazing material supply location is accumulated in the slit portion formed at the end of the tube, so that the refrigerant passage hole is less likely to clog the wax. Further, since the slit portion is formed avoiding the refrigerant passage hole, the wax accumulated in the slit portion is not easily sucked into the refrigerant passage hole. Therefore, the refrigerant passage hole and the communication passage are less likely to be clogged with the excessive wax, so that it is possible to prevent a decrease in heat exchange performance and an increase in passage resistance.

  According to the twenty-first aspect of the present invention, the clogging can be eliminated with the minimum necessary processing by providing the slit portion at a portion where the clogging is likely to occur such as the support column or the outermost side in the tube width direction.

  According to the twenty-second aspect of the present invention, it is possible to accumulate surplus wax on almost the entire circumference of the tube only by forming two slit portions.

  According to the invention of claim 23, the surplus wax that has melted from the brazing material supply location flows into the groove formed in the inner wall of the tube insertion hole, and is accumulated in the gap between the inner wall and the groove. The hole is less prone to wax clogging. Therefore, the refrigerant passage hole and the communication passage are less likely to be clogged with the excessive wax, so that it is possible to prevent a decrease in heat exchange performance and an increase in passage resistance.

  Embodiments of the joining structure of the header tank and the tube of the heat exchanger according to the present invention will be described below. In each embodiment, the same reference numerals are given to equivalent parts for explanation. Further, cross-sectional hatching and hidden lines are omitted as appropriate so as not to complicate the drawing.

  FIG. 24 is an external perspective view showing the overall configuration of the heat exchanger according to the present embodiment. The heat exchanger 1 can be broadly divided into a heat exchanger core 2 that exchanges heat between the refrigerant flowing inside and the cooling air 9, and a heat exchanger core 2 that is connected to the heat exchanger core 2 to distribute and merge the refrigerant. Header tanks 3 and 4 for the purpose.

  The heat exchanger core 2 is composed of a plurality of flat tubes 5 through which refrigerant flows and fins 6 arranged between the stacked tubes 5. A header tank 3 is disposed at one end in the longitudinal direction of the heat exchanger core 2 and is joined to one end of each tube 5. A header tank 4 is disposed at the other end in the longitudinal direction of the heat exchanger core 2 and is joined to the other end of each tube 5. Although not shown in FIG. 24, a plurality of tube holes (hereinafter referred to as refrigerant passage holes) through which the refrigerant flows are formed in the tube 5 along the longitudinal direction of the tube 5.

  The header tanks 3 and 4 are vertically opposed so as to be equally spaced from each other. Among these, an inlet pipe 7 for supplying a refrigerant is connected to one end of the header tank 3. The refrigerant supplied from the inlet pipe 7 is distributed from the header tank 3 to a predetermined tube 5 and flows into the header tank 4. The refrigerant further flows from the header tank 4 through a predetermined tube 5 and is returned to the header tank 3, where it merges and is taken out from the outlet pipe 8. During this time, when the cooling air 9 serving as a heat exchange medium passes between the tubes 5 and the fins 6 of the heat exchanger core 2, heat exchange is performed between the refrigerant flowing through the tubes 5 and the cooling air 9. Done. However, there are various combinations of refrigerant distribution paths, and the description of the distribution paths is an example.

  Next, specific examples will be described. In each of the following embodiments, a joining structure on the header tank 4 side will be described as an example.

  FIG. 1 is a cross-sectional view showing a joining structure between a header tank and a tube according to the first embodiment, and shows a cross-sectional view taken along line AA in FIG. Hereinafter, detailed description of the equivalent drawings of each embodiment will be appropriately omitted.

  The header tank 4 of the present embodiment is formed as a multi-hole structure in which four refrigerant flow paths 11a, 11b, 11c, and 11d are arranged on the same plane. These refrigerant flow paths 11 a to 11 d are flow paths having a substantially circular cross section formed by partitioning the inside of the tank by a plurality of partition walls 12 extending in the longitudinal direction of the header tank 4. On the upper surface of the header tank 4, tube insertion holes 19 for inserting and joining the end portions of the tubes 5 are arranged at regular intervals in the longitudinal direction.

  In addition, the partition wall 12 in the portion where the tube insertion hole 19 is formed is formed with a support column portion 12a that comes into contact with the end portion of the inserted tube 5. The end of the inserted tube 5 abuts uniformly on the upper surface of the support column 12a so that the tube 5 is positioned.

  Inside the tube 5, a plurality of refrigerant passage holes 25 through which refrigerant flows are formed at equal intervals.

  As shown in FIG. 2A, a protruding portion 13 having a concave cross section is formed at the end of the tube 5 in this embodiment. The inside of the protruding portion 13 becomes a communication passage 16 through which refrigerant flows when joined to the header tank 4, and a plurality of refrigerant passage holes 25 formed in the tube 5 are opened toward the communication passage 16. . However, the notch width w of the portion that becomes the communication passage 16 is set to be larger than the hole diameter d of the refrigerant passage hole 25 so as not to disturb the flow of the refrigerant, as shown in FIG. Yes.

  In addition, although the protrusion part 13 shown in a present Example is opening the both ends of the tube width direction, the protrusion part 13 may be a shape which covers the outer periphery of the edge part of the tube 5. FIG.

  As shown in FIG. 4, which is a cross-sectional view taken along the line BB in FIG. 1, the tube 5 is joined in a state where the tip of the protruding portion 13 is in contact with the column portion 12 a of the header tank 4. Thereby, the refrigerant discharged from the refrigerant passage hole 25 of the tube 5 flows into the refrigerant flow paths 11a to 11d of the header tank 4 from the communication path 16, and the refrigerant flowing through the refrigerant flow paths 11a to 11d passes through the communication paths 16 respectively. To the refrigerant passage hole 25 of the tube 5.

Next, the flow of brazing at the time of brazing in the above-described joint structure between the header tank and the tube will be described. FIG. 5 is a partial cross-sectional view showing the flow of wax at the joint between the header tank and the tube. FIG. 5 shows the orientation of the members during actual brazing, and both end portions of the header tank 4 are fixed so as to be up and down in the direction of gravity.
As shown in FIG. 5, the header tank 4 and the tube 5 are temporarily assembled, the brazing material is supplied to the portion where the tube 5 and the tube insertion hole 19 are in contact (the brazing material supply location 17), and heated in a furnace Then, the wax melted by heat flows into the header tank 4 along the path indicated by the arrow. At this time, particularly in the refrigerant passage hole 25 in the vicinity of the column portion 12a of the header tank 4 and the refrigerant passage hole 25 in the outermost side, clogging due to excessive wax tends to occur.

  However, in the connection structure of the present embodiment, the distance from the brazing material supply point 17 to the opening surface 26 of the coolant passage hole 25 becomes long, and the solder that has melted from the brazing material supply point 17 continues around the outer periphery of the protruding portion 13. Since it moves to the passage 16 side, it is difficult for excessive wax to reach the refrigerant passage hole 25. Moreover, since the protruding portion 13 of this embodiment has a relatively large space for the communication passage 16, the wax that has entered the communication passage 16 is less likely to be sucked into the refrigerant passage hole 25. As described above, in the joining structure of the present embodiment, the refrigerant passage hole 25 and the communication passage 16 are less likely to be clogged by excessive brazing, so that deterioration in heat exchange performance and increase in passage resistance can be prevented. 1 effect).

  Further, in this embodiment, since the end portion of the tube 5 is configured to abut evenly on the column portion 12a formed on the partition wall 12 of the header tank 4, the tube 5 can be easily and stably positioned. (Effect of Claim 1).

  FIG. 2B is a perspective view showing the end shape of the tube 5 in the second embodiment. In the second embodiment, a protruding portion 15 having a concave cross section is formed at the end portion of the tube 5, and a cutout portion is formed except for a portion where the protruding portion 15 contacts the support column portion 12 a and both end portions in the tube width direction. 18 is provided.

  In this embodiment, in addition to the effect of the first embodiment, the passage resistance in the refrigerant flow path can be further reduced (the effect of claim 2).

  In each of the above-described embodiments, an example in which the protruding portion 13 having a concave cross section is formed at the end of the tube 5 is shown. However, as shown in FIG. 3B, a protruding portion 14 having a V-shaped cross section is formed. Also good. Even in such a shape, the space as the communication passage 16 can be secured on the inside, and the distance that the braze moves from the brazing material supply point 17 to the opening surface 26 of the refrigerant passage hole 25 becomes long. It is possible to make it difficult for excessive wax to reach the coolant passage hole 25.

  FIG. 6A is a plan view showing an end shape of a tube having an inner fin, and FIG. 6B is a front view when viewed from an arrow C in FIG. The tube 5 </ b> A having the inner fin is obtained by inserting a corrugated inner fin 22 into a flat tube holder 21, and each space internally partitioned by the inner fin 22 is a refrigerant passage 23. In such a tube 5 </ b> A, by projecting the tip of the inner fin 22 away from the end of the tube, it is possible to form a protruding portion 24 having a concave cross-section whose inside becomes the communication path 16. In this case, by setting the tip 22a of the inner fin 22 to the back side of the end portion of the protruding portion 24 and to the inner side of the outer surface 27 of the header tank (header tank side), the pressure resistance can be ensured. .

  Even when the tube 5A having such an inner fin is used, the same effects as those of the above embodiments can be obtained. In particular, in this embodiment, the protruding portion 24 having a concave cross section can be formed without processing the end of the tube by cutting or the like (effect of claim 3).

  FIG. 7A is a partial cross-sectional view showing a joint structure between a header tank and a tube in Example 4, and FIG. 7B is a perspective view showing an end structure of the tube.

  In the joining structure of the present embodiment, as shown in FIG. 7B, among the plurality of refrigerant passage holes 25 opened at the end of the tube 5, the refrigerant passage holes that come into contact with the support column 12 a of the header tank 4. 25, a positioning pin 31 as a positioning member is inserted. The positioning pin 31 has a step so that when the pin is inserted into the coolant passage hole 25, the pin protrudes from the end of the tube 5 by a predetermined length. The length of the pin body and the position of the step are set so that the end of the tube 5 and the support column 12a are spaced apart at a predetermined interval when the tip of the protruding portion of the pin contacts the support column 12a. Has been.

  When the tube 5 is inserted into the tube insertion hole 19 of the header tank 4, as shown in FIG. 7A, the tip of the positioning pin 31 comes into contact with the support 12a, and the end of the tube 5 and the support 12a is spaced apart at a predetermined interval to form a gap 32, and the tube 5 is positioned at a predetermined position.

  In a state where the header tank 4 and the tube 5 are joined, gaps 32 are formed at equal intervals along the width direction of the header tank 4 between the end portion of the tube 5 and the column portion 12a. The gap 32 functions as a communication path, and the refrigerant discharged from the refrigerant passage hole 25 of the tube 5 flows into the refrigerant flow paths 11a to 11d of the header tank 4 through the gap 32, and the refrigerant flowing through the refrigerant flow paths 11a to 11d It flows into the refrigerant passage hole 25 of the tube 5 from the gap 32.

  According to the joint structure of the fourth embodiment, the solder that has melted from the brazing material supply location during brazing flows through the positioning pin 31 that is a positioning member and flows to the column portion 12a side. 25 becomes difficult to clog wax. In addition, the gap 32 formed between the end of the tube 5 and the support column 12a is a relatively wide space, so that the wax that flows into the support column 12a is not easily sucked into the refrigerant passage hole 25. In addition, since the positioning pin 31 does not enter the refrigerant flow paths 11a to 11d, an increase in passage resistance in the refrigerant flow path can be prevented. Therefore, in the joint structure of the present embodiment, it is possible to prevent a decrease in heat exchange performance and an increase in passage resistance due to the clogging of the space that becomes the refrigerant passage hole 25 and the communication passage (effect of claim 4).

  Further, in this embodiment, since the positioning pin 31 provided at the end of the tube 5 is in contact with the column 12a of the header tank 4 at equal intervals, the tube 5 can be easily and stably positioned. (Effect of claim 5).

  In the present embodiment, the gap 32 between the end of the tube 5 and the column 12a can be easily set by adjusting the position of the step in the positioning pin 31 (the effect of claim 5). .

  Furthermore, in this embodiment, it is not necessary to form a notch or the like at the end of the tube 5, and the existing tube can be used as it is (effect of claim 5).

  The positioning pins 31 can stably position the tube 5 as long as the positioning pins 31 are provided at least at both ends in the tube width direction.

  FIG. 8A is a partial cross-sectional view showing a joint structure between a header tank and a tube in Example 5, and FIG. 8B is a perspective view showing an end structure of the tube.

  In the joining structure of the present embodiment, as shown in FIG. 8 (b), among the plurality of refrigerant passage holes 25 opened at the end of the tube 5, the refrigerant passage holes that come into contact with the support column 12 a of the header tank 4. A pin insertion hole 33 is formed in the vicinity of 25, and a positioning pin 34 is inserted into the pin insertion hole 33 so that a part of the pin protrudes from the end of the tube 5. The length of the pin body and the depth of the pin insertion hole 33 are such that when the tip of the protruding portion of the positioning pin 34 comes into contact with the support column 12a, the distance between the end of the tube 5 and the support column 12a is a predetermined distance. It is set to be separated by.

  Then, when this tube 5 is inserted into the tube insertion hole 19 of the header tank 4, as shown in FIG. 8A, the tip of the positioning pin 34 comes into contact with the support column 12a, and the end of the tube 5 and the support column 12a is spaced apart at a predetermined interval to form a gap 32, and the tube 5 is positioned at a predetermined position.

  In a state where the header tank 4 and the tube 5 are joined, gaps 32 are formed at equal intervals along the width direction of the header tank 4 between the end portion of the tube 5 and the column portion 12a. The gap 32 functions as a communication path, and the refrigerant discharged from the refrigerant passage hole 25 of the tube 5 flows into the refrigerant flow paths 11a to 11d of the header tank 4 through the gap 32, and the refrigerant flowing through the refrigerant flow paths 11a to 11d It flows into the refrigerant passage hole 25 of the tube 5 from the gap 32.

  According to the joining structure of the fifth embodiment, surplus wax flows through the positioning pin 34 and flows into the column portion 12a, so that the refrigerant passage hole 25 is less likely to be clogged and the gap 32 is a relatively wide space. Therefore, the wax that has flowed into the column portion 12 a is less likely to be sucked into the refrigerant passage hole 25. In addition, since the positioning pin 34 does not enter the refrigerant flow paths 11a to 11d, an increase in passage resistance in the refrigerant flow path can be prevented. Therefore, in the joining structure of the present embodiment, it is possible to prevent a decrease in heat exchange performance and an increase in passage resistance due to the clogging of the space that becomes the refrigerant passage hole 25 and the communication passage.

  In particular, in this embodiment, since the positioning pin 34 is installed, the refrigerant passage hole 25 of the tube 5 is not sacrificed, so that more refrigerant can be flowed (effect of claim 6).

  Further, in this embodiment, the structure is such that the positioning pin 34 provided at the end of the tube 5 is brought into contact with the support column 12a of the header tank 4 at equal intervals, so that the tube 5 can be easily and stably positioned. (Effect of claim 6).

  In this embodiment, the gap 32 between the end portion of the tube 5 and the support column 12a can be easily set by adjusting the depth of the pin insertion hole 33 (the effect of claim 6). .

  The positioning pins 34 can stably position the tube 5 as long as the positioning pins 34 are provided at least at both ends in the tube width direction.

  FIG. 9A is a partial cross-sectional view showing a joint structure between a header tank and a tube in Example 6, and FIG. 9B is a perspective view showing an end structure of the tube.

  In the joining structure of the present embodiment, as shown in FIG. 9 (b), among the plurality of refrigerant passage holes 25 opened at the end of the tube 5, the refrigerant passage holes that come into contact with the column portion 12 a of the header tank 4. A slit 35 is formed between 25 and a positioning plate 36 is inserted into the slit 35 so that a part of the plate protrudes from the end of the tube 5. The length of the plate body and the depth of the slit 35 are such that when the tip of the protruding portion of the positioning plate 36 comes into contact with the support column 12a, the end of the tube 5 and the support column 12a are separated at a predetermined interval. It is set to be.

  When the tube 5 is inserted into the tube insertion hole 19 of the header tank 4, as shown in FIG. 9A, the tip of the positioning plate 36 comes into contact with the support 12a, and the end of the tube 5 and the support 12a is spaced apart at a predetermined interval to form a gap 32, and the tube 5 is positioned at a predetermined position.

  In a state where the header tank 4 and the tube 5 are joined, gaps 32 are formed at equal intervals along the width direction of the header tank 4 between the end portion of the tube 5 and the column portion 12a. The gap 32 functions as a communication path, and the refrigerant discharged from the refrigerant passage hole 25 of the tube 5 flows into the refrigerant flow paths 11a to 11d of the header tank 4 through the gap 32, and the refrigerant flowing through the refrigerant flow paths 11a to 11d It flows into the refrigerant passage hole 25 of the tube 5 from the gap 32.

  According to the joining structure of the sixth embodiment, surplus wax flows through the positioning plate 36 and flows into the column portion 12a, so that the coolant passage hole 25 is less likely to be clogged and the gap 32 becomes a relatively wide space. Therefore, the wax that has flowed into the column portion 12 a is less likely to be sucked into the refrigerant passage hole 25. In addition, since the positioning plate 36 does not enter the refrigerant flow paths 11a to 11d, it is possible to prevent an increase in passage resistance in the refrigerant flow path. Therefore, in the joining structure of the present embodiment, it is possible to prevent a decrease in heat exchange performance and an increase in passage resistance due to the clogging of the space that becomes the refrigerant passage hole 25 and the communication passage.

  In particular, in this embodiment, since the positioning plate 36 is simply inserted into the slit 35, the positioning member is installed by a relatively simple process compared to the case where an insertion hole or the like is formed at the end of the tube 5. (Effect of claim 7).

  Further, in this embodiment, since the coolant passage hole 25 of the tube 5 is not sacrificed for installing the positioning plate 36, more refrigerant can be flowed (effect of claim 7).

  Further, in this embodiment, since the positioning plate 36 provided at the end of the tube 5 is in contact with the support column 12a of the header tank 4 at equal intervals, the tube 5 can be positioned easily and stably. (Effect of claim 7).

  In the present embodiment, the gap 32 between the end portion of the tube 5 and the column portion 12a can be easily set by adjusting the depth of the slit 35 (the effect of claim 7).

  The positioning plate 36 can stably position the tube 5 as long as the positioning plate 36 is installed at least at both ends in the tube width direction.

  Also, as shown in FIG. 10, by providing the positioning plate 36 with a tapered chamfer toward the tip, the tube 5 can be easily inserted into the header tank 4 to improve workability. (Effect of claim 9).

  FIG. 11A is a partial cross-sectional view showing a joint structure between a header tank and a tube in Example 7, and FIG. 11B is a perspective view showing an end structure of the tube.

  In the joining structure of the present embodiment, as shown in FIG. 11 (b), a slit 37 is formed in the outermost portion in the width direction of the tube 5, and a positioning plate 38 is inserted into the slit 37, whereby the tube 5 A part of the plate protrudes from the end of the plate. The length of the plate body and the depth of the slit 37 are such that when the tip of the protruding portion of the positioning plate 38 comes into contact with the bottom surface of the refrigerant flow paths 11a and 11d, the end of the tube 5 and the support column 12a. The interval is set to be separated at a predetermined interval.

  Then, when this tube 5 is inserted into the tube insertion hole 19 of the header tank 4, as shown in FIG. 11A, the tip of the positioning plate 38 comes into contact with the bottom of the refrigerant flow path 11a, and the end of the tube 5 is reached. And the column 12a are spaced apart at a predetermined interval to form a gap 32, and the tube 5 is positioned at a predetermined position. Note that, on the refrigerant flow path 11d side (not shown), the tip of the positioning plate 38 is in contact with the bottom of the refrigerant flow path 11d, and the end of the tube 5 and the support column 12a are spaced apart at a predetermined interval. A gap 32 is formed.

  In a state where the header tank 4 and the tube 5 are joined, gaps 32 are formed at equal intervals along the width direction of the header tank 4 between the end portion of the tube 5 and the column portion 12a. The gap 32 functions as a communication path, and the refrigerant discharged from the refrigerant passage hole 25 of the tube 5 flows into the refrigerant flow paths 11a to 11d of the header tank 4 through the gap 32, and the refrigerant flowing through the refrigerant flow paths 11a to 11d It flows into the refrigerant passage hole 25 of the tube 5 from the gap 32.

  According to the joint structure of the seventh embodiment, as shown in FIG. 11A, the flow of the wax (movement in the direction of the arrow) is prevented by the positioning plate 38 at the outermost portion in the width direction of the tube 5. In particular, it is possible to effectively prevent the clogging of the refrigerant passage hole 25 formed on the outermost side in the width direction of the tube 5. Further, since members such as pins and plates do not exist in the communication path formed by the gap 32, the flow of the refrigerant between the refrigerant flow paths can be made smooth. As described above, in the joining structure of the present embodiment, it is possible to prevent deterioration in heat exchange performance and increase in passage resistance due to the clogging of the refrigerant passage hole 25 located on the outermost side in the width direction of the tube. 8 effect).

  Further, since the present embodiment has a structure in which the positioning plate 38 is simply inserted into the slit 37, the positioning member is installed by a relatively simple process compared to the case where an insertion hole or the like is formed at the end of the tube 5. (Effect of claim 8).

  Further, in this embodiment, since the coolant passage hole 25 of the tube 5 is not sacrificed in order to install the positioning plate 38, more refrigerant can be flowed (effect of claim 8).

  Further, in this embodiment, since the positioning plate 38 provided at the end of the tube 5 is in contact with the bottom surfaces of the refrigerant flow paths 11a and 11d at equal intervals, the tube 5 can be easily and stably positioned. (Effect of claim 8).

  Further, in the present embodiment, the gap 32 between the end portion of the tube 5 and the column portion 12a can be easily set by adjusting the depth of the slit 37 (effect of claim 8).

  Also, as shown in FIG. 10, by providing the positioning plate 36 with a tapered chamfer toward the tip, the tube 5 can be easily inserted into the header tank 4 to improve workability. (Effect of claim 9).

  12 is a cross-sectional view showing the joining structure of the header tank 4 and the tube 5 according to the eighth embodiment, FIG. 13 (a) is a partial perspective view showing the shape of the positioning plate, and FIG. 14 is taken along the line DD in FIG. It is sectional drawing.

  As shown in FIG. 13A, the joining structure of the present embodiment uses a positioning plate 41 obtained by molding a plate material with a concave cross section as a positioning member. The positioning plate 41 is provided with openings 43 at the bottom surface portion 41a and both side edge portions 41b except for the portion where the bottom surface portion 41a contacts the support column portion 12a of the header tank 4. And as shown in FIG. 14, it installs so that the bottom face part 41a may contact | abut with the upper surface of the support | pillar part 12a. Further, as shown in FIG. 14, the height h of the positioning plate 41 is such that when the ends of the tube 5 are brought into contact with both side edges 41b of the positioning plate 41, the end of the tube 5 and the column 12a Is set so as to be separated at a predetermined interval.

  Then, when the tube 5 is inserted into the tube insertion hole 19 of the header tank 4 in which the positioning plate 41 is installed, both side edges 41b of the positioning plate 41 come into contact with the ends of the tube 5 as shown in FIG. The communication path 16 is formed inside, and the tube 5 is positioned at a predetermined position. A plurality of refrigerant passage holes 25 formed in the tube 5 are open toward the communication passage 16.

  According to the joining structure of the eighth embodiment, the solder that has melted from the brazing material supply location during brazing is sucked into the outer peripheral portion (the gap between the plate and the column) of the positioning plate 41 that is a positioning member, and the communication path The flow into the side 16 is reduced, and the refrigerant passage hole 25 is less likely to be clogged by excessive wax. Moreover, since the space of the communication path 16 by the positioning plate 41 is relatively wide, even if a wax enters the communication path 16, it is difficult to be sucked into the refrigerant path hole 25. As described above, in the joining structure of the present embodiment, the refrigerant passage hole 25 and the communication passage 16 are less likely to be clogged by excessive brazing, so that deterioration in heat exchange performance and increase in passage resistance can be prevented. 10 effects).

  In particular, in the present embodiment, since the opening 43 is provided in the bottom surface 41a and both side edges 41b of the positioning plate 41 except for the portion where the bottom 41a contacts the support column 12a of the header tank 4, the refrigerant flow The passage resistance in the road can be reduced.

  Further, in this embodiment, since the positioning plate 41 installed on the upper surface of the support column 12a is in contact with the end of the tube 5, the tube 5 can be easily and stably positioned (invoice). Effect of item 10).

  Further, in the present embodiment, by adjusting the height of the positioning plate 41, the gap between the end portion of the tube 5 and the column portion 12a can be easily set (effect of claim 10).

  Furthermore, in this embodiment, it is not necessary to form a notch or the like at the end of the tube 5, and the existing tube can be used as it is (effect of claim 10).

  Further, as shown in FIG. 14, the tip of the positioning plate 41 can be easily inserted into the header tank 4 by forming the positioning plate 41 so as to be tapered from both side edge portions 41b toward the bottom surface portion 41a. Workability can be improved. Furthermore, since a gap serving as a wax pool can be formed in the outer peripheral portion of the positioning plate 41, excess wax can be accumulated in this gap (effect of claim 12).

  FIG. 13B is a partial perspective view showing the shape of the positioning plate in the ninth embodiment. In the positioning plate 42 of the ninth embodiment, openings 45 are provided at both side edge portions 42 b except for the portion that abuts on the column portion 12 a of the header tank 4. Also in the ninth embodiment, surplus wax is sucked into the outer peripheral portion of the positioning plate 42, and the flow into the communication path 16 is reduced, so that the refrigerant passage hole 25 is not easily clogged with wax, and a relatively wide space is connected. Even if wax enters the passage 16, it is difficult to be sucked into the refrigerant passage hole 25, and the excessive passage of wax makes it difficult for the refrigerant passage hole 25 and the communication passage 16 to be clogged, resulting in a decrease in heat exchange performance and an increase in passage resistance. Can be prevented.

  In particular, in the present embodiment, the opening 45 is provided on both side edges 42b of the positioning plate 42 except for the portion that contacts the support column 12a of the header tank 4, so that the passage resistance in the refrigerant flow path is reduced. (Effect of claim 11).

  Also in this embodiment, as shown in FIG. 14, the leading end of the positioning plate 42 is formed into a taper shape from both side edge portions 42b of the positioning plate 42 toward the bottom surface portion 42a. Since it becomes easy to insert in, workability | operativity can be improved. Furthermore, since a gap serving as a wax pool can be formed in the outer peripheral portion of the positioning plate 42, excess wax can be accumulated in this gap (effect of claim 12).

  15 is a sectional view showing a joint structure between the header tank 4 and the tube 5 according to the tenth embodiment, FIG. 16 (a) is a partial perspective view showing an end shape of the tube, and FIG. 17 is a line EE in FIG. FIG.

  In the end portion of the tube 5 in this embodiment, as shown in FIG. 16A, an abutting portion 51 is formed in which one outer wall is left with a certain thickness. The inside of the abutting portion 51 becomes a communication passage 16 through which refrigerant flows when joined to the header tank 4, and a plurality of refrigerant passage holes 25 formed in the tube 5 open toward the communication passage 16. Yes.

  As shown in FIG. 17, the tube 5 is joined in a state where the tip of the abutting portion 51 is in contact with the column portion 12 a of the header tank 4. The height of the abutting portion 51 is such that the opening end of the refrigerant passage hole 25 of the tube 5 and the strut portion 12a are separated at a predetermined interval when the tip of the abutting portion 51 abuts on the strut portion 12a. Is set to

  Then, when the tube 5 is inserted into the tube insertion hole 19 of the header tank 4, as shown in FIG. 15, the tip of the abutting portion 51 comes into contact with the support portion 12a, and the refrigerant passage hole 25 of the tube 5 and the support portion 12a. Are spaced apart from each other at a predetermined interval to form a communication path 16 therein, and the tube 5 is positioned at a predetermined position. As described above, since the refrigerant passage hole 25 of the tube 5 opens toward the communication passage 16, the refrigerant discharged from the refrigerant passage hole 25 of the tube 5 flows from the communication passage 16 to the header tank 4. The refrigerant flowing into the passages 11a to 11d and flowing through the refrigerant passages 11a to 11d flows into the refrigerant passage hole 25 of the tube 5 from each communication passage 16.

  According to the joining structure of the tenth embodiment, since the communication path 16 formed between the end of the tube 5 and the support column 12a becomes a relatively wide space, excess wax is accumulated in the communication path 16. Thus, the refrigerant passage hole 25 is less likely to be clogged with wax. Further, since the communication path 16 is a relatively wide space, the inside is not blocked by excessive wax, and the flow rate distribution between the refrigerant flow paths can be made uniform. Thus, in the joining structure of the present embodiment, it is possible to prevent the heat exchange performance from being lowered and the passage resistance from being increased due to the clogging of the refrigerant passage hole 25 and the communication passage 16 (effect of claim 13).

  Further, in this embodiment, since the abutting portion 51 provided at the end of the tube 5 is in contact with the support column portion 12a of the header tank 4 at equal intervals, the tube 5 is easily and stably positioned. (Effect of claim 13).

  In the present embodiment, the gap between the end portion of the tube 5 and the column portion 12a can be easily set by adjusting the height of the abutting portion 51 (effect of claim 13).

  In the present embodiment, the outer wall of the abutting portion 51 is on the downstream side of the refrigerant flow direction in the refrigerant flow path on the refrigerant inlet side of the tube 5, and the outer wall of the abutting portion 51 is the refrigerant on the refrigerant outlet side. By setting so that it may become upstream with respect to the refrigerant | coolant flow direction in the flow paths 11a-11d, the flow of a refrigerant | coolant becomes smooth and the passage resistance in a refrigerant | coolant flow path can be reduced. effect).

  FIG. 16B is a perspective view showing the end shape of the tube 5 in the eleventh embodiment. In the present embodiment, an abutting portion 52 in which one outer wall remains at a constant thickness is formed at the end of the tube 5, and a notch 53 is formed in the abutting portion 52 except for a portion that abuts on the column portion 12 a. Is provided.

  In this example, in addition to the effect of the tenth example, the passage resistance in the refrigerant flow path can be further reduced (effect of claim 15).

  Also in this embodiment, the outer wall of the abutting portion 52 is on the downstream side of the refrigerant flow direction in the refrigerant flow path on the refrigerant inlet side of the tube 5, and the outer wall of the abutting portion 52 is on the refrigerant outlet side. Is set to be upstream with respect to the refrigerant flow direction in the refrigerant flow paths 11a to 11d, the flow of the refrigerant becomes smooth, and the passage resistance in the refrigerant flow path can be reduced. 14 effects).

  18 is a cross-sectional view showing a joint structure between the header tank 4 and the tube 5 according to the twelfth embodiment, FIGS. 19A to 19C are partial perspective views showing the end shape of the tube, and FIG. FIG. 21 is a sectional view taken along line GG in FIG. 18.

  At the end of the tube 5 in this embodiment, as shown in FIG. 19A, a wedge-shaped abutting section 61 having a hypotenuse on one side is formed at the opening end of the refrigerant passage hole 25. The oblique side of the abutting portion 61 is a communication passage 16 through which refrigerant flows when joined to the header tank 4, and a plurality of refrigerant passage holes 25 formed in the tube 5 are opened to the communication passage 16 side. Yes. Further, at the end of the tube 5, a groove 62 is formed along the tube width direction on one side of the oblique side of the outer periphery in contact with the inner wall of the tube insertion hole 19.

  As shown in FIG. 20, the tube 5 is joined in a state where the tip of the abutting portion 61 is in contact with the column portion 12 a of the header tank 4. At this time, the end shape of the tube 5 (notch dimension of the oblique side portion) is set so that a predetermined space serving as the communication passage 16 is secured between the opening end of the refrigerant passage hole 25 and the support column portion 12a. ing.

  Then, when the tube 5 is inserted into the tube insertion hole 19 of the header tank 4, as shown in FIG. 18, the tip of the abutting portion 61 comes into contact with the support portion 12a, and the refrigerant passage hole 25 of the tube 5 and the support portion 12a. Are spaced apart from each other at a predetermined interval to form a communication path 16 therein, and the tube 5 is positioned at a predetermined position. As described above, since the refrigerant passage hole 25 of the tube 5 opens toward the communication passage 16, the refrigerant discharged from the refrigerant passage hole 25 of the tube 5 flows from the communication passage 16 to the header tank 4. The refrigerant flowing into the passages 11a to 11d and flowing through the refrigerant passages 11a to 11d flows into the refrigerant passage hole 25 of the tube 5 from each communication passage 16.

  According to the joining structure of Example 12 described above, surplus wax that has melted from the brazing material supply location is accumulated in the gap formed between the inner wall of the tube insertion hole 19 and the groove 62, and the surplus brazing causes the refrigerant path to pass. Since the hole 25 and the communication passage 16 are less likely to be clogged with wax, it is possible to prevent a decrease in heat exchange performance and an increase in passage resistance.

  In particular, in this embodiment, the wax flowing from the outer periphery on the hypotenuse side where the distance from the brazing material supply location to the refrigerant passage hole 25 is short is accumulated in the gap formed between the inner wall of the tube insertion hole 19 and the groove 62. Therefore, it hardly flows into the communication path 16 side. In addition, the distance of the wax flowing from the outer circumference opposite to the oblique side to the refrigerant passage hole 25 becomes longer, so that excessive wax is less likely to be sucked into the refrigerant passage hole 25. As described above, in the joining structure of the present embodiment, the refrigerant passage hole 25 and the communication passage 16 are less likely to be clogged by excessive brazing, so that deterioration in heat exchange performance and increase in passage resistance can be prevented. 16 effects).

  Further, in this embodiment, the abutting portion 61 formed at the end of the tube 5 is in contact with the column portion 12a of the header tank 4 at equal intervals, so that the tube 5 can be easily and stably positioned. (Effect of claim 16).

  Further, the position of the groove portion for accumulating excess wax is not limited to one side, and as shown in FIG. 19 (b), on both sides of the outer periphery contacting the inner wall of the tube insertion hole 19 along the tube width direction. The grooves 63a and 63b may be formed.

  When the groove portions 63a and 63b are formed on both surfaces of the tube 5 in this way, the wax can be accumulated on both surfaces of the tube, and in particular, the wax flowing from the side opposite to the hypotenuse side is accumulated in the groove portion 63b. Further, it is possible to make it difficult for excessive wax to be sucked into the refrigerant passage hole 25 (the effect of claim 17).

  Moreover, as shown in FIG.19 (c), you may form the groove part 64 over the perimeter of the outer periphery which contacts the inner wall of the tube insertion hole 19. FIG.

  When the groove portion 64 is formed over the entire circumference of the tube 5 in this way, the wax can be accumulated over the entire circumference of the tube, and in particular, the wax flowing from the outermost side in the tube width direction, which is likely to be clogged with the wax, into the groove portion 64. Since it can be accumulated, excess wax can be further prevented from being sucked into the refrigerant passage hole 25 (effect of claim 18).

  Further, in the thinnest portion of the header tank 4, it is conceivable that the pressure resistance performance of the joint portion is lowered unless the groove portion is filled with solder. Therefore, as shown in FIG. 21, by forming the groove 62 inside the header tank rather than the thinnest wall portion of the header tank 4, not only the clogging of the wax is eliminated, but also the pressure resistance performance against the high-pressure refrigerant can be maintained. (Effect of Claim 19).

  In the present embodiment, an example in which a wedge-shaped abutting section 61 having a hypotenuse on one side is formed at the end of the tube 5, but the end of the tube 5 may be chamfered at a right angle. Other shapes may be used as long as they can function equally as a tube, and this embodiment can be implemented regardless of the end shape of the tube.

  FIGS. 22A and 22B are perspective views showing the shape of each end of the tube 5 in Example 13. FIG. In addition, since the basic joining structure of a tube and a header tank is the same as FIG. 18, description is abbreviate | omitted.

  The end portion of the tube 5 in this embodiment is formed with a wedge-shaped abutting section 71 having an oblique side on one side at the opening end of the refrigerant passage hole 25 as in the twelfth embodiment. In this embodiment, as shown in FIG. 22A, a plurality of slit portions 72 penetrating in the thickness direction of the tube are formed in the vicinity of the refrigerant passage hole 25 of the abutting portion 71.

  According to the above-described joining structure, the excessive wax melted from the brazing material supply location is accumulated in the slit portion 72 formed in the abutting portion 71, so that the refrigerant passage hole 25 is less likely to be clogged with the solder. Further, since the slit portion 72 is formed so as to avoid the refrigerant passage hole 25, it is difficult for the wax accumulated in the slit portion 72 to be sucked into the refrigerant passage hole 25. As described above, in the joining structure of the present embodiment, the refrigerant passage hole 25 and the communication passage 16 are less likely to be clogged by excessive brazing, so that deterioration in heat exchange performance and increase in passage resistance can be prevented. Effect).

  In particular, in the joining structure shown in FIG. 22 (a), by providing the slit portion 72 at a place where the wax portion is likely to be clogged, such as the column portion 12a or the outermost side in the tube width direction, the clogging can be eliminated with the minimum necessary processing. (Effect of claim 21).

  As another embodiment, as shown in FIG. 22B, slit portions 73 and 74 penetrating in the width direction of the tube may be formed in the vicinity of the refrigerant passage hole 25 of the abutting portion 71.

  Even in the above-described joining structure, surplus wax is accumulated in the slit portions 73 and 74 formed in the abutting portion 71, so that the refrigerant passage hole 25 is less likely to be clogged with wax. Further, since the slit portions 73 and 74 are formed so as to avoid the refrigerant passage hole 25, it is difficult for the wax accumulated in the slit portions 73 and 74 to be sucked into the refrigerant passage hole 25. As described above, in the joining structure of the present embodiment, the refrigerant passage hole 25 and the communication passage 16 are less likely to be clogged by excessive brazing, so that deterioration in heat exchange performance and increase in passage resistance can be prevented. Effect).

  In particular, in the joining structure shown in FIG. 22B, by forming two slit portions, it is possible to accumulate surplus wax on almost the entire circumference of the tube 5 (effect of claim 22).

  Moreover, in each said Example, since it is the structure which abuts 71 formed in the edge part of the tube 5 contact | abuts to the support | pillar part 12a of the header tank 4 at equal intervals (refer FIG. 18), the tube 5 is made easy. And it can position stably (effect of Claim 20).

  In the present embodiment, the example in which the wedge-shaped abutting portion 71 having an oblique side on one side is formed at the end of the tube 5 is shown. However, the end of the tube 5 may be chamfered at a right angle. Other shapes may be used as long as they can function equally as a tube, and this embodiment can be implemented regardless of the end shape of the tube.

  FIGS. 23A and 23B are partial cross-sectional views showing a connection structure between the header tank 4 and the tube 5 according to the fourteenth embodiment. In the present embodiment, the end shape of the tube 5 is formed with a wedge-shaped abutting section (reference numeral omitted) having an oblique side on one side at the opening end of the refrigerant passage hole 25 as in the twelfth and thirteenth embodiments. However, the end of the tube 5 is not formed with a groove or a slit. Moreover, since the basic joining structure of a tube and a header tank is the same as FIG. 18, description is abbreviate | omitted.

  In the header tank 4 according to the present embodiment, as shown in FIG. 23A, grooves 81 having a concave cross section are formed in a plurality of locations on the inner wall of the tube insertion hole 19. The groove portion 81 may penetrate the header tank 4 in the thickness direction or may be formed halfway.

  According to the joining structure of Example 14, the excessive solder melted from the brazing material supply location flows into the groove 81 formed on the inner wall of the tube insertion hole 19 and is accumulated in the gap between the inner wall and the groove 81. Therefore, the coolant passage hole 25 is less likely to be clogged with wax. As described above, in the joining structure of the present embodiment, the refrigerant passage hole 25 and the communication passage 16 are less likely to be clogged by excessive brazing, so that deterioration in heat exchange performance and increase in passage resistance can be prevented. Effect).

  Further, in the present embodiment, as in the thirteenth embodiment, the abutting portion formed at the end portion of the tube 5 is in contact with the column portion of the header tank 4 at equal intervals (see FIG. 18). Can be easily and stably positioned (effect of claim 23).

  On the other hand, the shape of the groove is not limited to a concave cross section, and may be a groove 82 having a triangular cross section as shown in FIG. The dimension of the groove part is set to such a size that a gap formed between the inner wall of the tube insertion hole 19 and the groove part is filled with excess wax.

  Further, the groove may be provided on the entire inner wall of the tube insertion hole 19 or may be provided at a place where the solder is likely to be clogged, such as the support column or the outermost side in the tube width direction.

  In the present embodiment, an example in which a wedge-shaped abutting section having a hypotenuse on one side is formed at the end of the tube 5, but the end of the tube 5 may be chamfered at right angles, Other shapes may be used as long as they can function equally as a tube, and this embodiment can be implemented regardless of the end shape of the tube.

FIG. 3 is a partial cross-sectional view showing a joint structure between a header tank and a tube according to the first embodiment. (A) is a perspective view which shows the edge part shape of the tube in Example 1. FIG. (B) is a perspective view which shows the edge part shape of the tube in Example 2. FIG. (A), (b) is a side view which shows the communicating path shape of the tube in Example 1,2. Sectional drawing in the BB line of FIG. FIG. 9 is a partial cross-sectional view showing a flow of wax in a joint portion between a header tank and a tube in the second embodiment. (A) is a top view which shows the edge part shape of the tube which has an inner fin in Example 3. FIG. (B) is a front view when it sees from the arrow C of (a). (A) is a fragmentary sectional view which shows the joining structure of a header tank and a tube in Example 4. FIG. (B) is a perspective view which shows the edge part structure of a tube. (A) is a fragmentary sectional view which shows the joining structure of a header tank and a tube in Example 5. FIG. (B) is a perspective view which shows the edge part structure of a tube. (A) is a fragmentary sectional view which shows the joining structure of a header tank and a tube in Example 6. FIG. (B) is a perspective view which shows the edge part structure of a tube. The side view of the positioning plate which carried out the taper-shaped chamfering. (A) is a fragmentary sectional view which shows the joining structure of a header tank and a tube in Example 7. FIG. (B) is a perspective view which shows the edge part structure of a tube. Sectional drawing which shows the joining structure of the header tank and tube concerning Example 8. FIG. (A) is a partial perspective view which shows the shape of the positioning plate in Example 8. FIG. (B) is a partial perspective view which shows the shape of the positioning plate in Example 9. FIG. Sectional drawing in the DD line | wire of FIG. Sectional drawing which shows the joining structure of the header tank and tube concerning Example 10. FIG. (A) is a perspective view which shows the edge part shape of the tube in Example 10. FIG. (B) is a perspective view which shows the edge part shape of the tube in Example 11. FIG. Sectional drawing in the EE line | wire of FIG. Sectional drawing which shows the joining structure of the header tank and tube concerning Example 12. FIG. (A)-(c) is a fragmentary perspective view which shows each edge part shape of a tube. Sectional drawing in the FF line | wire of FIG. Sectional drawing in the GG line | wire of FIG. (A), (b) is a perspective view which shows each edge part shape of the tube in Example 13. FIG. (A), (b) is a fragmentary sectional view which shows the connection structure of the header tank and tube concerning Example 14. FIG. The external appearance perspective view which shows the whole structure of the heat exchanger concerning an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Heat exchanger 2 ... Heat exchanger core 3, 4 ... Header tank 5, 5A ... Tube 11a-11d ... Refrigerant flow path 12 ... Partition 12a ... Strut part 13, 14, 15, 24 ... Protrusion part 16 ... Communication path 17 ... Brazing material supply location 18, 53 ... Notch 19 ... Tube insertion hole 21 ... Tube holder 22 ... Inner fin 25 ... Refrigerant passage hole 31, 34 ... Positioning pin 32 ... Gap 33 ... Pin insertion hole 35, 37 ... Slit 36, 38, 41, 42 ... positioning plate 41a, 42a ... bottom face part 41b, 42b ... side edge part 43, 45 ... opening part 51, 52, 61, 71 ... butting part 62, 63a, 63b, 64, 81, 82 ... Groove 72, 73 ... Slit

Claims (23)

A plurality of tubes (5) in which a plurality of refrigerant passage holes (25) are formed, fins (6) disposed between the stacked tubes (5), and an end portion of the tubes (5). It is a joining structure of a header tank and a tube of a heat exchanger having a header tank (4) to be joined,
The header tank (4) includes a tube insertion hole (19) for inserting the tube (5) and a plurality of refrigerant flow paths (11) extending in the longitudinal direction of the header tank (4). A partition wall (12) to be formed, and a column portion (12a) that is formed in the partition wall (12) and contacts the end of the tube (5) inserted from the tube insertion hole (19),
A protruding portion (13) having a concave cross section is formed at the end of the tube (5), and the tip of the protruding portion is brought into contact with the support column (12a) of the header tank (4) to be joined by brazing. A heat exchanger header tank and tube joining structure.   The protruding portion (15) is provided with a notch portion (18) except for a portion where the protruding portion (15) abuts on the support column portion (12a) and both end portions in the tube width direction. The joining structure of the header tank and tube of the heat exchanger of claim | item 1.   The tube is a tube (5A) in which a corrugated inner fin (22) is inserted into a flat tube (21), and the tip of the inner fin (22) is separated from the end of the tube (5A). The joint structure of the header tank and the tube of the heat exchanger according to claim 1, wherein the protruding portion (24) is formed by the above. A plurality of tubes (5) in which a plurality of refrigerant passage holes (25) are formed, fins (6) disposed between the stacked tubes (5), and an end portion of the tubes (5). It is a joining structure of a header tank and a tube of a heat exchanger having a header tank (4) to be joined,
The header tank (4) includes a tube insertion hole (19) for inserting the tube (5) and a plurality of refrigerant flow paths (11) extending in the longitudinal direction of the header tank (4). A partition wall (12) to be formed, and a column portion (12a) that is formed in the partition wall (12) and contacts the end of the tube (5) inserted from the tube insertion hole (19),
A positioning member (31, 34, 36, 38, 41, 42) is provided at the end of the tube (5) to separate the end from the support (12a) at a predetermined interval. A heat exchanger header tank and tube connection structure.   The positioning member is a positioning pin (31) provided with a step for positioning, and the tip of the positioning pin (31) inserted into the predetermined coolant passage hole (25) is brought into contact with the support column (12a). 5. The joining structure of the header tank and the tube of the heat exchanger according to claim 4, wherein the end portion of the tube (5) and the support column (12 a) are spaced apart at a predetermined interval. .   A pin insertion hole (33) having a predetermined depth is formed in the vicinity of the refrigerant passage hole (25) at an end of the tube (5), and the positioning member is a positioning pin (34) having a predetermined length. And by inserting the positioning pin (34) into the pin insertion hole (33), the positioning pin (34) protrudes from the end of the tube (5) by a predetermined length, and the positioning pin (34) The end of the tube (5) and the support post (12a) are separated from each other at a predetermined interval by bringing the tip of the support into contact with the support post (12a). Joining structure of heat exchanger header tank and tube.   A slit (35) having a predetermined depth is formed at an end of the tube (5) between the adjacent refrigerant passage holes (25), and the positioning member is a positioning plate (36) having a predetermined length. Yes, by inserting the positioning plate (36) into the slit (35), the positioning plate (36) protrudes from the end of the tube (5) by a predetermined length, and the tip of the positioning plate (36) The heat exchange according to claim 4, wherein the end of the tube (5) and the support post (12a) are separated from each other by a predetermined interval by contacting the support post with the support post (12a). The connection structure between the header tank of the vessel and the tube.   A slit (37) having a predetermined depth is formed at the outer end of the tube (5) and in the tube width direction, and the positioning member is a positioning plate (38) having a predetermined length. By inserting the plate (38) into the slit (37), the positioning plate (38) is protruded from the end of the tube (5) by a predetermined length, and the tip of the positioning plate (38) is opposed to the end. The end of the tube (5) and the support post (12a) are spaced apart from each other at a predetermined interval by being brought into contact with the bottom surface of the refrigerant flow path (11). Joining structure of heat exchanger header tank and tube.   The joining structure of the header tank and the tube of the heat exchanger according to claim 7 or 8, wherein the positioning plate (36, 38) is chamfered in a tapered shape toward the tip.   The positioning member is a positioning plate (41) formed in a concave cross section. The bottom surface portion (41a) of the positioning plate (41) is brought into contact with the support column portion (12a), and both side edge portions (41b) ) Is brought into contact with the end of the tube (5), thereby separating the end of the tube (5) and the support (12a) at a predetermined interval. Joining structure of header tank and tube of described heat exchanger.   The opening (45) is provided on both side edges (42b) of the positioning plate (42) except for a part where the both side edges abut on the support column (12a). Joining structure of header tank and tube of described heat exchanger.   The positioning plate (41, 42) is formed in a taper shape from the side edge portions (41b, 42b) toward the bottom surface portion (41a, 42a). The joining structure of the header tank and tube of the heat exchanger described in 1. A plurality of tubes (5) in which a plurality of refrigerant passage holes (25) are formed, fins (6) disposed between the stacked tubes (5), and an end portion of the tubes (5). It is a joining structure of a header tank and a tube of a heat exchanger having a header tank (4) to be joined,
The header tank (4) includes a tube insertion hole (19) for inserting the tube (5) and a plurality of refrigerant flow paths (11) extending in the longitudinal direction of the header tank (4). A partition wall (12) to be formed, and a column portion (12a) that is formed in the partition wall (12) and contacts the end of the tube (5) inserted from the tube insertion hole (19),
At the end of the tube (5), an abutting portion (51) is formed with one outer wall remaining at a constant thickness, and the tip of the protruding portion abuts on the support column (12a) of the header tank (4). A joining structure of a header tank and a tube of a heat exchanger, characterized by being brazed and joined.   On the refrigerant inlet side of the tube (5), the outer wall of the abutting portion (51) is the downstream side with respect to the refrigerant flow direction in the refrigerant channel (11), and the refrigerant outlet side of the tube (5) Then, the header tank of the heat exchanger according to claim 13, wherein the outer wall of the abutting portion (51) is located upstream with respect to the refrigerant flow direction in the refrigerant flow path (11). Connection structure with tube.   The cutout portion (53) is provided on the outer wall of the abutting portion (52) except for a portion where the outer wall abuts on a column portion (12a) of the header tank (4). Item 15. A structure for joining a header tank and a tube of a heat exchanger according to Item 13 or 14. A plurality of tubes (5) in which a plurality of refrigerant passage holes (25) are formed, fins (6) disposed between the stacked tubes (5), and an end portion of the tubes (5). It is a joining structure of a header tank and a tube of a heat exchanger having a header tank (4) to be joined,
The header tank (4) includes a tube insertion hole (19) for inserting the tube (5) and a plurality of refrigerant flow paths (11) extending in the longitudinal direction of the header tank (4). A partition wall (12) to be formed, and a column portion (12a) that is formed in the partition wall (12) and contacts the end of the tube (5) inserted from the tube insertion hole (19),
In the tube (5), a groove (62) is formed on one outer peripheral surface in contact with the inner wall of the tube insertion hole (19), and the end of the tube (5) is connected to the support column ( 12a) A joining structure of a header tank and a tube of a heat exchanger, wherein the joining structure is joined by brazing.   The header tank of the heat exchanger according to claim 16, wherein grooves (63) are formed on both sides of the outer periphery contacting the inner wall of the tube insertion hole (19) at the end of the tube (5). Connection structure with tube.   17. The heat exchanger according to claim 16, wherein a groove (64) is formed at the end of the tube (5) over the entire circumference of the outer periphery contacting the inner wall of the tube insertion hole (19). Joint structure of header tank and tube.   The said groove part (62, 63, 64) is formed inside a header tank (4) rather than the thinnest part of the said header tank (4) brazed and joined with the said tube (5), The joining structure of the header tank and the tube of the heat exchanger according to any one of 16 to 18. A plurality of tubes (5) in which a plurality of refrigerant passage holes (25) are formed, fins (6) disposed between the stacked tubes (5), and an end portion of the tubes (5). It is a joining structure of a header tank and a tube of a heat exchanger having a header tank (4) to be joined,
The header tank (4) includes a tube insertion hole (19) for inserting the tube (5) and a plurality of refrigerant flow paths (11) extending in the longitudinal direction of the header tank (4). A partition wall (12) to be formed, and a column portion (12a) that is formed in the partition wall (12) and contacts the end of the tube (5) inserted from the tube insertion hole (19),
At the end of the tube (5), slit portions (72, 73, 74) are formed in the vicinity of the refrigerant passage hole (25), and the end of the tube (5) is connected to the support column of the header tank (4). A joining structure of a header tank and a tube of a heat exchanger, wherein the joining is made by abutting on the portion (12a) and brazing.   The said slit part (72) has penetrated in the thickness direction of the said tube (5), The joining structure of the header tank and tube of a heat exchanger of Claim 20 characterized by the above-mentioned.   The said slit part (73, 74) has penetrated in the width direction of the said tube (5), The joining structure of the header tank and tube of a heat exchanger of Claim 20 characterized by the above-mentioned. A plurality of tubes (5) in which a plurality of refrigerant passage holes (25) are formed, fins (6) disposed between the stacked tubes (5), and an end portion of the tubes (5). It is a joining structure of a header tank and a tube of a heat exchanger having a header tank (4) to be joined,
The header tank (4) includes a tube insertion hole (19) in which a plurality of grooves (81, 82) are formed on an inner wall and a longitudinal direction of the header tank (4). A partition wall (12) that forms a path (11), and a column portion (12a) that is formed in the partition wall (12) and contacts the end of the tube (5) inserted through the tube insertion hole (19). With
A joining structure of a header tank and a tube of a heat exchanger, wherein an end of the tube (5) is brought into contact with the support column (12a) of the header tank (4) and brazed.

Images