JP2006336978A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve brazing quality by improving accuracy of a set position of a connection part. <P>SOLUTION: The heat exchanger 1 comprises a core part 4 with tubes 2 and fins 3 alternately arranged in a plurality of stages, and first and second header tanks 6, 7 having hollow spaces communicating with inside passages of the tubes 2, extending in an arrangement direction of the tubes 2 and fins 3, and arranged on both end parts of the core part 4 respectively. The connection part for connecting the hollow space, a flow-in pipe for a flowing-in refrigerant, and a flow-out pipe for flowing-out refrigerant is provided on one of hollow openings 9 of either of both ends of the first and second header tanks 6, 7. The connection part includes an extending part 32e extending to a side of the core part 4 toward a side of the other header tank, and a clearance L is provided between the extending part 32e and a side surface of the core part 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heat exchanger, and more particularly to a structure of a connection portion that connects a hollow space of a header tank to an inflow pipe and an outflow pipe.

  2. Description of the Related Art Conventionally, a heat exchanger that is connected to a refrigerant circuit such as an air conditioner for a vehicle and functions as an evaporator and is manufactured by brazing and joining components thereof (for example, a patent) Reference 1).

  This heat exchanger includes a core portion in which a plurality of tubes through which a refrigerant passes and fins that promote heat exchange between the refrigerant and the air to be treated are alternately arranged, and is provided at both ends of the core portion. In addition, first and second header tanks are provided. A hollow space is formed inside the first and second header tanks, and the hollow space communicates with the internal flow path of the tube. In addition, at one end of the first header tank, an inflow pipe through which the refrigerant flows into the heat exchanger and an outflow pipe through which the refrigerant flows out of the heat exchanger are provided. And this inflow piping and outflow piping are connected with the hollow space of the 1st header tank by the connection part.

And such a heat exchanger is brazed after restraining in the longitudinal direction of the 1st and 2nd header tanks with restraint bodies, such as a metal wire, in the state where each part clad with brazing material beforehand was assembled and held. It is manufactured by heating in an attaching furnace, melting the brazing material at the joint of each component, and integrating the components.
JP 2004-44928 A

  However, as shown in FIG. 15, in the manufacture of the conventional heat exchanger 101 by brazing and joining, the first and second header tanks 106 and 107 are arranged in the longitudinal direction when assembled and after brazing. Although there is no change in length, in the core portion 104, the brazing material clad at the joint between the tube 102 and the fin 103 is melted and joined, so that the length in the arrangement direction is equal to the thickness of the molten brazing material. Decrease. In this case, when assembly is performed in consideration of a decrease in the length of the core portion 104 in the arrangement direction after brazing, both end portions of the first and second header tanks 106 and 107 in the core portion 104 are raised. Then, when a part of the connection part 150 has the extension part 132e extended to the side of the core part 104, the connection part 150 must be inclined and joined according to the rise. When the connecting portion 150 is brazed in such a state, the length in the arrangement direction of the core portions 104 is reduced during the brazing process, and the connecting portion 150 is displaced. There was a problem that it might lead to a defect.

  The present invention has been made in view of such points, and an object of the present invention is to increase the installation position accuracy of the connecting portion and to improve the brazing quality.

  In order to achieve the above object, in the present invention, a predetermined gap is provided between the extension portion of the connection portion and the side surface of the core portion.

  Specifically, according to the first aspect of the present invention, there is provided a core portion in which tubes and fins are alternately arranged in a plurality of stages in a direction substantially perpendicular to the air flow direction of the air to be treated, and a hollow communicating with the internal flow paths of the plurality of tubes. A space is formed, and includes first and second header tanks that extend in the arrangement direction of the plurality of tubes and fins and are respectively disposed at both ends of the core portion. The target is a heat exchanger that is brazed and joined after the two header tanks are assembled.

  One of the hollow openings at either end of the first or second header tank is provided with a connecting portion that connects the hollow space to the inflow pipe into which the refrigerant flows and the outflow pipe from which the refrigerant flows out. The connection portion has an extension portion extending to the side of the core portion toward the other head tank side, and a predetermined gap is provided between the extension portion and the side surface of the core portion. .

  That is, in the core part, when the brazing material clad in the joint part between the tube and the fin is melted and joined, the assembly is performed in consideration of the reduction in the length in the arrangement direction. The department gets excited. However, according to the above configuration, a predetermined gap is provided between the extension portion of the connection portion and the side surface of the core portion, and the core portion swells in the gap, so this bulge portion becomes the extension portion of the connection portion. There is no contact. For this reason, since it is not necessary to incline and join a connection part according to a rise like the past, a connection part does not displace in the process of brazing.

  In the second invention, the core portion is brazed and joined by the brazing material clad on the tube, and the gap is equal to or greater than the product of the plate thickness of the tube, the brazing material clad rate of the tube, and the number of steps of the core portion. It has a certain configuration.

  According to the above configuration, when the core part is bonded to the tube by brazing the brazing material, the gap width should be set to be equal to or greater than the product of the tube thickness, the brazing material cladding rate of the tube, and the number of steps of the core part. The gap more than the rising part of the core part at the time of assembly is provided. Here, the brazing material cladding ratio refers to the ratio of the thickness of the brazing material clad to the core material to the thickness of the core material such as a tube.

  In the third invention, the core part is brazed and joined by the brazing material clad on the fin, and the gap is equal to or greater than the product of the fin thickness, the brazing material clad rate of the fin, and the number of steps of the core part. It has a certain configuration.

  According to the above configuration, when the core portion is bonded to the fin by brazing the brazing material, the width of the gap is set to be equal to or more than the product of the fin plate thickness, the fin brazing material cladding ratio, and the number of steps of the core portion. The gap more than the rising part of the core part at the time of assembly is provided.

  In 4th invention, the said connection part is set as the structure hold | maintained in this hollow opening by the tank side fitting part formed in the said hollow opening periphery.

  According to said structure, a connection part is brazed in the state hold | maintained in the connection position of the hollow opening by the tank side fitting part.

  In a fifth aspect of the invention, the connecting portion includes an inner wall portion and an outer member that fits in a sealed manner with the inner wall portion, and the inner wall portion and the outer member are connected to at least one of the connecting portions. It is set as the structure hold | maintained by the side fitting part.

  According to said structure, the inner side wall part and outer side member of a connection part are brazed in the temporary assembly state hold | maintained by the connection part side fitting part.

  In a sixth aspect of the invention, the connecting portion mechanically holds a connector portion to which the inflow pipe and the outflow pipe are connected.

  According to the above configuration, the manufacturing process can be simplified by brazing the connecting portion together with brazing of the connecting portion without providing a separate step of connecting the connector portion to the connecting portion, and the connector portion is mechanically connected to the connecting portion. Are brazed in a temporarily assembled state held in

  According to the first aspect of the present invention, the predetermined gap is provided between the extension portion of the connection portion and the side surface of the core portion so that the raised portion of the core portion at the time of assembly does not contact the extension portion of the connection portion. Yes. For this reason, it is not necessary to incline and join the connecting portion in accordance with the rise, so even if the length in the arrangement direction of the core portion is reduced during the brazing process, the connecting portion is not displaced and the position of the connecting portion is not changed. Accuracy can be increased and brazing quality can be improved.

  According to the second aspect of the invention, the gap is set to be equal to or greater than the product of the tube thickness, the brazing material cladding ratio of the tube, and the number of steps of the core portion. According to the third aspect of the invention, the gap is set to be equal to or greater than the product of the fin plate thickness, the fin brazing material cladding ratio, and the number of steps of the core portion. According to these inventions, by setting the width of the gap in this way, it is possible to provide a gap that is larger than the raised part of the core part during assembly, and design an optimal connection part for setting the width of the gap. It can be done easily.

  According to the fourth aspect of the invention, the connecting portion is held in the hollow opening by the tank side fitting portion, and brazing is performed while the connecting portion is held at the connection position of the hollow opening. For this reason, the position accuracy of the connecting portion can be further increased, and the brazing quality can be improved.

  According to the fifth aspect, the inner wall portion and the outer member of the connecting portion are fitted by the connecting portion side fitting portion provided in at least one, and the inner wall portion and the outer member are fitted to the connecting portion side. It is held by the part and brazed in the assembled state. For this reason, the positional accuracy of joining of the inner wall portion and the outer member can be increased, and the brazing quality can be improved.

  According to the sixth aspect of the invention, the connector part to which the inflow pipe and the outflow pipe are connected is mechanically held at the connection part, and the connector part is joined together with the brazing of the connection part. For this reason, the production process of the heat exchanger can be simplified, and the connector portion is brazed while being mechanically held at the connection portion. Quality can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

-Heat exchanger configuration-
The heat exchanger 1 according to the embodiment of the present invention is connected to a refrigerant circuit such as a vehicle air conditioner and functions as an evaporator. The heat exchanger 1 includes a core portion 4, first and second header tanks 6 and 7 disposed at both end portions (upper and lower end portions in FIG. 1), and both end portions of the core portion 4. And end plates 8 respectively disposed on the left and right end portions (left and right end portions in FIG. 1).

  The core portion 4 has a plurality of tubes 2 and fins 3 (corrugated fins) alternately arranged in a direction (left and right direction in FIG. 1) substantially perpendicular to the direction of air to be treated (indicated by arrows in FIG. 2). It is configured. The tube 2 is formed in a flat plate shape whose vertical direction is the longitudinal direction. And the upper end is connected to the 1st header tank 6 in the state in which the plane of the tube 2 seen from the longitudinal direction of the 1st, 2nd header tanks 6 and 7 becomes substantially parallel to the ventilation direction of to-be-processed air. On the other hand, the lower end is connected to the second header tank 7. On the other hand, as shown in FIG. 1, the fin 3 is interposed between the plurality of tubes 2 (only one part is shown in FIG. 1). The fin 3 is formed in a wave shape when viewed from the upstream side of the air to be treated. The left end portion of the corrugated portion of the fin 3 is fixed to the tube 2 adjacent to the left side, while the right end portion of the corrugated portion is fixed to the tube 2 adjacent to the right side. Further, the fins 3 positioned at both ends of the core portion 4 are fixed to a plate-like end plate 8 adjacent to the fins 3.

  As shown in FIG. 2, the core part 4 is comprised by the upstream core part 4a located in the upstream of to-be-processed air, and the downstream core part 4b located in the downstream of to-be-processed air. Specifically, the upstream core portion 4a is composed of a plurality of tubes 2a and fins 3 (not shown in FIG. 2) arranged closer to the upstream side of the air to be processed, and the downstream core portion 4b is It consists of a plurality of tubes 2b and fins 3 (not shown in FIG. 2) arranged closer to the downstream side of the air.

  The first header tank 6 is a hollow cylindrical member formed to extend in the arrangement direction of the plurality of tubes 2 and fins 3 over the entire upper end portion of the core portion 4. As shown in FIG. 1, the first header tank 6 includes a first header plate 10 as a header portion located in the lower portion thereof, and a first tank plate 11 as a tank portion located in the upper portion thereof.

  The first header plate 10 has a substantially C-shaped vertical cross section (see FIG. 3) as viewed from the longitudinal direction, and has an upper end slightly outward in a direction away from each other in order to increase rigidity. It is bent. A plurality of hole portions 10 a into which the upper end portions of the plurality of tubes 2 are inserted and held are formed on the lower end surface of the first header plate 10. A header-side recess 10 b that is recessed downward is formed at the center of the first header plate 10 in the direction in which the air to be processed flows on the lower end surface.

  On the other hand, the first tank plate 11 has a substantially C-shape in which a vertical section viewed from the longitudinal direction has an opening on the lower side and a central portion of the upper end surface in the direction in which the air to be treated flows is gently recessed downward. I am doing. In the center of the recess on the upper end surface of the first tank plate 11, a tank-side recess 11a that is recessed upward is formed. The first header plate 10 and the first tank plate 11 are formed by pressing an aluminum alloy plate.

  A flat partition plate 20 is provided inside the first header tank 6. The partition plate 20 is formed to extend from one end to the other end of the first header tank 6 in the arrangement direction of the tubes 2 and the fins 3.

  The partition plate 20 is sandwiched between the header-side recess 10b and the tank-side recess 11a, and the opening inner wall of the first header plate 10 and a part of the opening outer wall of the first tank plate 11 are in contact with each other. The first header plate 10 and the first tank plate 11 are fixed. In this state, a hollow space is formed inside the first header tank 6, and in a state where the partition plate 20 and the bottom surface of the first header plate 10 are substantially vertical, the hollow space is closer to the upstream side. It is divided into a first upstream space 41 and a first downstream space 42 closer to the downstream side (see FIG. 3). Hollow openings 9 are formed at both ends of the first header tank 6.

  As shown in FIG. 9, the first upstream space 41 communicates with the flow paths of the plurality of tubes 2a in the upstream core portion 4a. The first upstream space 41 is partitioned into two spaces (left and right spaces in FIG. 9) by an upstream baffle plate 21 provided at an intermediate position in the longitudinal direction of the first header tank 6. On the other hand, the first downstream space 42 communicates with the flow paths of the plurality of tubes 2b in the downstream core portion 4b. The first downstream space 42 is divided into two spaces by a downstream baffle plate 22 provided at an intermediate position in the longitudinal direction of the first header tank 6. Further, the partition plate 20 located between the left space in the first upstream space 41 and the left space in the first downstream space 42 is formed with a communication hole (not shown). The left space in the side space 41 and the left space in the first downstream space 42 communicate with each other through this communication hole.

  On the other hand, as shown in FIG. 4, the second header tank 7 is disposed at the lower end of the core portion 4 in a state where the first header tank 6 described above is rotated 180 degrees. The second header tank 7 includes a second header plate 13 serving as a header portion located in the upper portion thereof, and a second tank plate 14 serving as a tank portion located in the lower portion thereof. A plurality of holes 13 a into which the lower ends of the plurality of tubes 2 are inserted and held are formed on the upper end surface of the second header plate 13. Further, a partition plate 20 is provided inside the second header tank 7 in the same manner as the first header tank 6. The hollow space inside the second header tank 7 is divided into a second upstream space 43 on the upstream side and a second downstream space 44 on the downstream side. The second upstream space 43 communicates with the flow paths of the plurality of tubes 2a in the upstream core portion 4a. On the other hand, the second downstream space 44 communicates with the flow paths of the plurality of tubes 2b in the downstream core portion 4b. Hollow openings 9 are also formed at both ends of the second header tank 7.

  One end of the first header tank 6 (left end in FIG. 1) and the hollow openings 9 at both ends of the second header tank 7 are covered with the first cap 31, and the other end of the first header tank 6 (right end in FIG. 1). The hollow opening is covered with a second cap 32.

  Specifically, the first cap 31 has a cross section similar to the outer peripheral shape of the vertical cross section when the first and second header tanks 6 and 7 are viewed in the longitudinal direction, and closes the hollow opening 9 from the outside. 1st cap main body 31a of the shape is provided. A header side fitting that is bent perpendicularly to the first cap body 31a and fitted to the first and second header plates 10 and 13 at the periphery of the hollow opening 9 is provided on substantially the entire outer periphery of the first cap body 31a. A joint portion 31b and a tank side fitting portion 31c that fits into the first and second tank plates 11 and 14 are provided.

  Further, the first cap body 31a is provided with a through hole 31d made of a long hole at the center in the direction in which the air to be treated flows so as to correspond to the partition plate 20. The through hole 31d is slightly larger than the outer periphery of the partition plate 20 so that the partition plate 20 can be inserted therethrough.

  As described above, at the left end of the first header tank 6, the first cap 31 is fitted from the outside of the hollow opening 9, so that the header side fitting portion 31b and the tank side fitting portion 31c of the first cap 31 are fitted. Thus, the first header plate 10 incorporating the partition plate 20 and the first tank plate 11 are sandwiched. The leading end 20 a of the partition plate 20 that penetrates the through hole 31 d of the first cap 31 is caulked and fixed to the first cap 31. In each figure, the front end 20a of the partition plate 20 represents a shape before caulking for convenience of explanation.

  As shown in FIGS. 5 to 9, the second cap 32 connects the first downstream space 42 and an inflow pipe 37 (shown only in FIG. 9) through which the refrigerant flows, A connecting portion 50 is provided for connecting an outflow pipe 38 (shown only in FIG. 9) through which the refrigerant flows out. And this connection part 50 is equipped with the plate-shaped inner wall part 32a which comprises the inner wall, and the outer member 51 which comprises the outer wall and is fitted and hold | maintained at the inner wall part 32a. As shown in FIG. 6, the inner wall portion 32 a has a shape similar to the outer edge shape of the vertical section when the first header tank 6 is viewed in the longitudinal direction on the upper side, and closes the hollow opening 9 from the outside. 32b and an extension 32e extending in an arc shape on the lower side. The closed portion 32b of the inner wall portion 32a is located on the upstream side of the air to be treated, and is located on the downstream side of the air to be treated, and the through hole 36a communicating with the first upstream space 41 in the first header tank 6. In addition, a through hole 36 b communicating with the first downstream space 42 in the first header tank 6 is formed. In addition, the inner wall portion 32a is provided with a connection portion side fitting portion 32c bent perpendicularly to the inner wall portion 32a at almost the entire circumference of the inner wall portion 32a with a space therebetween.

  The outer member 51 is tightly fitted to the inner wall portion 32a by caulking the connecting portion side fitting portion 32c. As shown in FIG. 7, the outer member 51 has a through hole 51a and a passage hole 51b having the same inner diameter corresponding to the through holes 36a and 36b of the inner wall part 32a, and is in contact with the inner wall part 32a. Part 51c and a container-like pipe line part 51d that covers the through hole 36b of the inner wall part 32a in a hermetically sealed manner, and the passage part 52 is formed in a region sandwiched between the pipe part 51d and the inner wall part 32a. It is formed (see FIG. 5). A passage hole 51f is opened below the surface of the pipe line portion 51d.

  In the state where the through holes 36a, 51a, the through holes 36b, and the passage holes 51b of the connecting portion 50 in which the inner wall portion 32a and the outer member 51 are fitted by the connecting portion side fitting portion 32c are respectively overlapped, the connector portion 53 is inserted from the outer member 51 side. That is, as shown in FIG. 8, the connector portion 53 extends to the inner wall portion 32a side, and is connected to the upstream side pipe portion 53a inserted into the through holes 36a and 51a, and is shorter than the upstream side pipe portion 53a. And a downstream pipe portion 53b inserted into the passage hole 51f of the passage portion 51d. And the connector part side fitting part 53c is provided in the opening periphery of the connection part 50 side edge part of this upstream side pipe part 53a and the downstream side pipe part 53b. The connector part 53 is held in the connection part 50 by inserting the connector part 53 into the connection part 50 and caulking the connector part side fitting part 53c. As shown in FIG. 2, the connector portion 53 is attached so as to incline upstream with respect to the upper and lower center lines perpendicular to the direction in which the air to be treated of the heat exchanger 1 flows. When the 1 header tank 6 is viewed in the longitudinal direction, the outer periphery thereof does not protrude greatly from the heat exchanger 1. An outflow pipe 38 through which the refrigerant circulating through the heat exchanger 1 flows out is connected to the upstream pipe section 53a of the connector section 53, and an inflow pipe 37 through which the refrigerant circulating through the heat exchanger 1 flows into the downstream pipe section 53b. Connected.

  As shown in FIG. 5B, the other end of the first tank plate 11 of the first header tank 6 is provided with a tank side fitting portion 6a protruding to the other end side. The first header tank 6 is caulked with the tank-side fitting portion 6a to hold the connecting portion 50, and the hollow opening 9 is closed with the closing portion 32b of the inner wall portion 32a. Covered with.

  A gap L is provided between the extension portion 32 e of the inner wall portion 32 a of the connection portion 50 and the end plate 8. The gap L is set to a value obtained by L ≧ L1 × u1 × 2 × (N / 2). Here, L1: the total thickness of the tube and the thickness of the brazing material clad in the tube, u1: the brazing material clad rate of the tube, and N: the number of steps of the core part. The brazing material cladding ratio of the tube is a ratio of the thickness of the brazing material to the total thickness of the tube thickness and the brazing material clad in the tube.

  That is, as shown in FIG. 10, when the tube 2 is clad with the brazing material 5 and the core portion 4 is joined, L1 × u1 represents the thickness of the brazing material 5, and the double value is expressed on both side surfaces of the tube 2. The total amount of the thickness of the brazing material 5 that affects one side of the core portion 4 is calculated by multiplying the thickness of the brazing material 5 clad with the core portion 4 by half of the number of steps of the core portion 4. That is, the gap L is set to be equal to or greater than the total thickness of the brazing material 5.

-Manufacturing method-
Next, the manufacturing method by brazing joining of the heat exchanger 1 which concerns on this embodiment is demonstrated.

  First, the brazing material 5 is clad in advance on each component described above. At this time, in the core portion 4, the brazing material 5 is clad on the tube 2 as shown in FIG. 10. The thickness of the clad brazing material 5 is L1 × u1.

  Next, the connection part side fitting part 32c provided in the inner wall part 32a of the connection part 50 is caulked to the outer member 51, and the inner wall part 32a and the outer member 51 are fitted and held. Further, the upstream side pipe part 53 a of the connector part 53 is inserted into the through holes 36 a and 51 a of the connection part 50, and the downstream side pipe part 53 b of the connector part 53 is inserted into the passage hole 51 f of the pipe part 51 d of the connection part 50. And the connector part side fitting part 53c provided in the upstream side pipe part 53a and the downstream side pipe part 53b is each crimped, and the connection part 50 and the connector part 53 are fitted and hold | maintained. Further, the tank side fitting portion 6 a provided on the first tank plate 11 is caulked to the connection portion 50, and the connection portion 50 is held on the first tank plate 11.

  And the heat exchanger 1 is assembled | attached as shown in FIG. The core portion 4 is assembled in a state where the end plate 8 is bent so that both sides in the arrangement direction swell in consideration that the length in the arrangement direction is reduced by the total amount of the thickness of the brazing filler metal 5 to be melted. It is done. At this time, a gap L is provided between the upper end portion of the end plate 8 and the extension portion 32e of the inner wall portion 32a, and this gap L is set to be equal to or greater than the total thickness of the brazing material 5. The connecting portion 50 is assembled at a position where the extension portion 32e and the end plate 8 do not contact each other.

  The assembled heat exchanger 1 is restrained in the longitudinal direction of the first and second header tanks 6 and 7 by a restraining body such as a metal wire. Then, the heat exchanger 1 in this state is heated in a heating furnace for brazing, and the brazing material 5 at the joint portion of each component is melted to integrally manufacture the heat exchanger 1 as shown in FIG. To do. At this time, as shown in FIG. 11, the core portion 4 is melted and joined by the brazing material 5 at the joint portion between the tube 2 and the fin 3, and the core portion 4 is equal to the total thickness of the melted brazing material 5. The length in the arrangement direction decreases. Since the connecting portion 50 is assembled at a position where the extension portion 32e of the inner wall portion 32a and the end plate 8 do not come into contact with each other, the connecting portion 50 is not displaced during the brazing process.

-Refrigerant circulation operation-
Next, the refrigerant circulation operation in the heat exchanger 1 according to the present embodiment will be described with reference to FIG. In addition, the refrigerant | coolant expanded and cooled by the expansion valve etc. which were connected to the refrigerant circuit flows in into the heat exchanger 1, for example.

  The refrigerant flows from the inflow pipe 37 of the second cap 32 through the passage portion 52 into the heat exchanger 1. The refrigerant flowing through the passage 52 passes through the through hole 36 b of the second cap 32 and then flows into the right space in the first downstream space 42 formed in the first header tank 6. And this refrigerant | coolant is distributed to the tube 2b in the downstream core part 4b, and distribute | circulates downward. The refrigerant that has flowed through each tube 2 b gathers in the right side space in the second downstream space 44 formed in the second header tank 7, and flows into the left side space in the second downstream space 44. And this refrigerant | coolant is distributed to the tube 2b of the downstream core part 4b, and distribute | circulates upward.

  The refrigerant flowing through each tube 2b gathers in the left space in the first downstream space 42 formed in the first header tank 6, passes through a communication hole (not shown), and passes through the first upstream of the first header tank 6. It distributes to the left space in the side space 41. And this refrigerant | coolant is distributed to the tube 2a of the upstream core part 4a, and distribute | circulates downward. The refrigerant that has circulated through each tube 2 a gathers in a space on the left side in the second upstream space 43 formed in the second header tank 7 and circulates to the right space in the second upstream space 43. And this refrigerant | coolant is distributed to the tube 2a of the upstream core part 4a, and distribute | circulates upward again. The refrigerant gathers in the right space in the first upstream space 41 formed in the first header tank 6. As described above, the refrigerant flowing through the upstream and downstream core portions 4a and 4b in the heat exchanger 1 passes through the through hole 36a of the second cap 32 and then passes through the outflow pipe 38 of the second cap 32. And flows out of the heat exchanger 1.

  On the other hand, the air to be treated flows in the direction of the white arrow in FIG. 9 with respect to the heat exchanger 1 and flows through the core portion 4 of the heat exchanger 1. The air to be treated passes through the heat exchanger 1 while being cooled by the tubes 2 and the fins 3 of the core portion 4.

-Effect of the embodiment-
Therefore, in the heat exchanger 1 of the present embodiment, the gap L is provided between the extension part 32e of the inner wall part 32a of the connection part 50 and the end plate 8, and the raised part of the core part 4 during assembly is the inner wall. The extension 32e of the part 32a is not brought into contact with the extension 32e. For this reason, since it is not necessary to incline and join the connection part 50 according to the swell, even if the length of the arrangement direction of the core part 4 decreases in the brazing process, the connection part 50 is not displaced. The positional accuracy of the connecting portion 50 can be increased and the brazing quality can be improved.

  According to the present embodiment, the gap L is set such that L ≧ L1 × u1 × 2 × (N / 2). For this reason, it is possible to provide a gap L that is equal to or greater than the raised portion of the core portion 4 at the time of assembly, and it is possible to easily design an optimal connection portion 50 for setting the gap L.

  According to the present embodiment, the connecting portion 50 is held on the first tank plate 11 by the tank side fitting portion 6 a and brazed in a state where the connecting portion 50 is held at the connection position of the first header tank 6. For this reason, the positional accuracy of the connection part 50 can be made higher and brazing quality can be improved.

  According to this embodiment, the inner wall part 32a and the outer member 51 of the connection part 50 are fitted by the connection part side fitting part 32c provided in the inner wall part 32a, and the inner wall part 32a and the outer member 51 are Is brazed while being held by the connecting portion side fitting portion 32c. For this reason, the positional accuracy of joining of the inner side wall part 32a and the outer side member 51 can be made high, and brazing quality can be improved.

  According to this embodiment, the connector part 53 is held by the connection part 50 by the connector part side fitting part 53c, the process of connecting the connector part 53 to the connection part 50 is omitted, and the connector part 53 is connected to the connection part 50. It is joined together with brazing. For this reason, the production process of the heat exchanger 1 can be simplified, and brazing is performed with the connector portion 53 held in the connection portion 50, so that the positional accuracy of the connection of the connector portion 53 is increased and brazing is performed. Can improve the quality.

<< Other Embodiments >>
The present invention may be configured as follows with respect to the above embodiment.

  That is, in the above embodiment, the tank side fitting portion 6a is provided on the first tank plate 11, but may be provided on the first header plate 10 as shown in FIG.

  Moreover, in the said embodiment, although the inner wall part 32a and the outer member 51 were fitted by the connection part side fitting part 32c provided in the inner wall part 32a, the connection part side fitting part 32c is used. They may be provided on the outer member 51 and fitted together.

  Further, in the above embodiment, the brazing material 5 is clad on the tube 2 and the core portion 4 is brazed, but the brazing material 5 may be clad on the fin 3 as shown in FIG. At this time, the gap L between the extension portion 32e of the inner wall portion 32a of the connection portion 50 and the end plate 8 is set to a value obtained by L ≧ L2 × u2 × 2 × (N / 2). Here, L2: the total thickness of the fins and the thickness of the brazing material clad on the fins, u2: the brazing material clad rate of the fins, and N: the number of steps of the core part. The brazing material clad rate of the fin is a ratio of the thickness of the brazing material to the total thickness of the fin and the brazing material clad on the fin. That is, L2 × u2 represents the thickness of the brazing material 5, and the double value is the thickness of the brazing material 5 clad on both side surfaces of the fin 3, and this is multiplied by half the number of steps of the core portion 4. The total amount of the thickness of the brazing material 5 that affects one side of the core portion 4 is calculated. That is, the gap L is set to be equal to or greater than the total thickness of the brazing material 5.

  As described above, the present invention is useful for a heat exchanger connected to a refrigerant circuit such as a vehicle air conditioner and functioning as an evaporator.

It is a front view of the heat exchanger which concerns on embodiment of this invention. It is a side view of a heat exchanger. It is the III-III sectional view taken on the line of FIG. It is the IV-IV sectional view taken on the line of FIG. (A) is a top view which shows a connection part and its periphery, (b) is the side view. (A) is a side view which shows an inner wall part, (b) is the front view. (A) is a side view which shows an outer side member, (b) is the front view. (A) is a side view which shows a connector part, (b) is the front view. It is explanatory drawing which shows the circulation operation | movement of the refrigerant | coolant in a heat exchanger. It is detail drawing of the core part of the state which clad the brazing | wax material and assembled | attached to the tube. It is detail drawing of the core part after brazing. It is detail drawing of the core part of the state which clad the brazing | wax material and assembled | attached to the fin. It is a front view of the heat exchanger after assembly | attachment and before brazing. It is an equivalent view of Drawing 5 (b) concerning other embodiments. It is a schematic block diagram of the heat exchanger which concerns on a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Tube 2a Tube 2b Tube 3 Fin 4 Core part 4a Upstream core part (core part)
4b Downstream core part (core part)
5 Brazing material 6 First header tank 6a Tank side fitting portion 7 Second header tank 9 Hollow opening 32a Inner side wall portion 32c Connection portion side fitting portion 32e Extension portion 37 Inflow piping 38 Outflow piping 41 First upstream space 42 First 1 downstream space 43 second upstream space 44 second downstream space 50 connection portion 53 connector portion L gap L1 tube thickness L2 fin plate thickness

Claims (6)

A core portion in which a plurality of tubes and fins are alternately arranged in a direction substantially perpendicular to the air flow direction of the air to be treated and a hollow space communicating with the internal flow paths of the plurality of tubes are formed. And first and second header tanks extending in the fin arrangement direction and disposed at both ends of the core part, and brazing after the tube, fins, and first and second header tanks are assembled. A joined heat exchanger,
The hollow opening at either end of the first or second header tank is provided with a connection portion that connects the hollow space to an inflow pipe into which the refrigerant flows and an outflow pipe from which the refrigerant flows out. Has an extension portion extending to the side of the core portion toward the other header tank side, and a predetermined gap is provided between the extension portion and the side surface of the core portion. Exchanger. The heat exchanger of claim 1,
The core part is brazed and joined by the brazing material clad in the tube,
The heat exchanger is characterized in that the gap is not less than the product of the thickness of the tube, the brazing material cladding ratio of the tube, and the number of stages of the core portion. The heat exchanger of claim 1,
The core part is brazed and joined by the brazing material clad on the fin,
The heat exchanger is characterized in that the gap is not less than the product of the plate thickness of the fin, the brazing material clad rate of the fin, and the number of stages of the core portion. The heat exchanger according to any one of claims 1 to 3,
The heat exchanger according to claim 1, wherein the connecting portion is held in the hollow opening by a tank side fitting portion formed on the periphery of the hollow opening. The heat exchanger according to claim 4,
The connecting portion includes an inner wall portion and an outer member that fits in a sealed manner with the inner wall portion, and the inner wall portion and the outer member are held by a connecting portion side fitting portion provided on at least one side. Heat exchanger characterized by being made. The heat exchanger according to claim 4 or 5,
The heat exchanger according to claim 1, wherein a connector portion to which the inflow pipe and the outflow pipe are connected is mechanically held in the connection portion.

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