JP2018179320A - Pipe attachment structure of heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit erosion resulting from welding of a pipe tip in a header.SOLUTION: A pipe attachment structure of a heat exchanger includes: a pipe insertion hole 30 provided at a header 29 of a heat exchanger; a header inner pipe 17 having a tip 19 inserted into the pipe insertion hole and having a constant outer diameter; a welding part 31 which welds the tip of the header inner pipe to the header; a cover member 33 attached to an outer surface part of the header and covering the tip of the header inner pipe; and a hose attachment pipe 32 provided at the cover member and having an enlarged diameter part 38. An inner diameter D1 of the pipe insertion hole has a size which is larger than or equal to the outer diameter d2 of the tip of the header inner pipe and smaller than an outer diameter d5 of the enlarged diameter part.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a heat exchanger pipe mounting structure.

  In some cases, the tip of the in-header pipe provided in the header of the heat exchanger is penetrated from the inside of the header to the outside and welded to the header, and the in-header pipe is attached to the header. In this case, the header is provided with a pipe insertion hole, and the tip of the inner pipe is inserted through the pipe insertion hole from the inside of the header to the outside. Then, from the outside of the header, the end of the inner pipe is welded to the header so as to close the gap between the inner pipe end of the header and the pipe insertion hole.

Utility model registration No. 3084366

  However, it is planned that another hose be inserted and attached to the inner pipe end of the header, and the inner pipe end of the inner header is formed with an enlarged diameter part for retaining the hose. In this case, the inner diameter of the pipe insertion hole is larger than the outer diameter of the enlarged diameter portion so that the enlarged diameter portion can pass through the pipe insertion hole.

  Then, if it is attempted to weld the end of the pipe in the header to the header at a portion other than the enlarged diameter portion, the amount of welding increases or the welding time increases because the gap between that portion and the pipe insertion hole is large. There is a problem that the parts melt away due to the heat of welding, and the end of the pipe in the header is clogged or punctured.

  Accordingly, the present invention has been made in view of such circumstances, and an object thereof is to provide a pipe mounting structure of a heat exchanger capable of suppressing the melt damage associated with welding of the pipe end portion in the header.

According to one aspect of the invention,
A pipe insertion hole provided in the header of the heat exchanger;
An in-header pipe having a tip portion with a constant outer diameter, which is inserted into the pipe insertion hole;
A weld for welding the tip of the pipe in the header to the header;
A cover member attached to the outer surface of the header and covering the tip of the inner pipe;
A hose attachment pipe provided on the cover member and having an enlarged diameter portion;
Equipped with
The pipe mounting structure of a heat exchanger is provided, wherein the inner diameter of the pipe insertion hole has a size equal to or larger than the outer diameter of the distal end portion of the header inner pipe and smaller than the outer diameter of the enlarged diameter portion. .

  Preferably, the tip of the header inner pipe and the hose attachment pipe are coaxially arranged.

According to another aspect of the invention,
A pipe insertion hole provided in the header of the heat exchanger;
An in-header pipe having a tip end that is inserted into the pipe insertion hole;
A first enlarged diameter portion formed at the tip of the header inner pipe and positioned in the pipe insertion hole;
A hose attachment portion formed at the tip end of the header inner pipe and positioned on the tip end side of the first enlarged diameter portion;
A second enlarged diameter portion formed in the hose attachment portion;
A weld for welding the first enlarged diameter portion to the header;
Equipped with
The pipe attachment structure of a heat exchanger is provided, wherein the inner diameter of the pipe insertion hole is equal to or larger than the outer diameter of the first enlarged diameter portion and equal to or larger than the outer diameter of the second enlarged diameter portion. Ru.

  Preferably, the outer diameter of the first enlarged diameter portion has a size equal to the outer diameter of the second enlarged diameter portion.

  Preferably, the first enlarged diameter portion is larger in diameter and thicker than the hose attachment portion, and has the same inner diameter as the hose attachment portion.

  Preferably, the first enlarged diameter portion, the hose attachment portion, and the second enlarged diameter portion have the same thickness.

  The heat exchanger may be an intercooler for cooling the intake air of the engine.

  The header may be an outlet header for discharging the cooled intake air.

  The inner header pipe may be disposed in the outlet header and configured to suction condensed water stagnated in the outlet header.

  According to the present invention, it is possible to suppress the erosion caused by the welding of the pipe end portion in the header.

1 is a schematic side view of an engine cooling device of a vehicle to which the first embodiment is applied. It is a partial front view which shows the structure of the left side of an engine cooling device. It is the III section detail of FIG. FIG. 13 is a detail corresponding view of a part III of the first example of the second embodiment. FIG. 9 is a view corresponding to the detail of a part III of the second example of the second embodiment. FIG. 13 is a view corresponding to the detail of a part III of the third practical example of the second embodiment. It is a III section corresponding detail of 4th Example of 2nd Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The pipe mounting structure of a heat exchanger according to an embodiment of the present invention relates to a structure for mounting a pipe in the header to the header of an intercooler which is a heat exchanger. However, it should be noted that the present invention is not limited to the embodiments described herein.

First Embodiment
FIG. 1 is a schematic side view of an engine cooling device of a vehicle to which a first embodiment of the present invention is applied. The vehicle and an engine (internal combustion engine) as a vehicle power source mounted on the vehicle are not shown because they are well known. In the present embodiment, the vehicle is a large vehicle such as a truck, and the engine is a diesel engine. However, the type and application of the vehicle and the internal combustion engine are not particularly limited. For example, the vehicle may be a small vehicle such as a passenger car, and the engine may be a gasoline engine.

  In the illustrated example, each direction of orthogonal three axes, that is, each direction of front, rear, left, right, upper and lower is defined as illustrated. However, it should be noted that the directions are merely determined for the sake of easy understanding of the explanation. Each direction of front and rear, right and left upper and lower sides of an example of illustration corresponds with each direction of vehicles. The engine is vertically mounted on a vehicle, and a radiator 1 is disposed at a distance in front of the engine.

  The engine cooling device includes a radiator 1 attached to a vehicle body (not shown) of the vehicle. Here, "attached" includes not only directly attached to an object to be attached but also indirectly attached to an object to be attached via an intermediate structure (a bracket or the like).

  The radiator 1 is a member that exchanges heat with the outside air to cool the engine cooling water. The radiator 1 has an inlet header 3 into which cooling water from the engine is introduced, a core 4 for passing the cooling water introduced to the inlet header 3 and exchanging heat with the outside air, and cooling after passing through the core 4 It integrally has an outlet header 5 for introducing water and discharging it to the engine. Here, a downflow type in which the cooling water flows from the upper inlet header 3 toward the lower outlet header 5 is adopted, but a crossflow type in which the cooling water flows laterally may be adopted. The radiator 1 is disposed perpendicularly to a central axis (referred to as a fan axis) C of a fan (not shown) which will be described later, that is, arranged upright, and attached to the vehicle body via a bracket (not shown). The radiator 1 may be arranged to be inclined with respect to the direction perpendicular to the fan axis C. As is well known, the radiator 1 has a square shape in a front view. The radiator 1 is disposed forward at the front end of the vehicle and receives traveling wind from the front when the vehicle travels. The fan axis C is parallel to the crankshaft axis direction of the engine.

  An inlet pipe 6 is integrally provided in the inlet header 3, and the inlet pipe 6 is connected to a supply hose (not shown) extending from the engine side and supplied with cooling water. In addition, an outlet pipe 7 is integrally provided in the outlet header 5, and the outlet pipe 7 is connected to an unillustrated discharge hose extending from the engine side to discharge the cooling water.

  A resin-made shroud 8 is attached to the rear surface portion or the rear surface portion of the radiator 1, and a rubber ring-shaped fan cover 9 is attached to the shroud 8. Although not shown, the fan cover 9 is slidably brought into contact with the outer periphery of the fan ring, and the fan rotationally driven by the engine is installed coaxially and with a small gap inside the radial direction of the fan ring. . About these, since it is well-known, description is abbreviate | omitted. Fan rings and fans are attached to the engine.

  As also shown in FIG. 2, the radiator 1 of the present embodiment includes side brackets 10 that collectively fix the inlet header 3, the core 4 and the outlet header 5. The side bracket 10 has an angular U-shaped cross-sectional shape and is provided on both left and right sides, but only the left side is shown in the figure. A vibration absorbing elastic member is interposed between the inlet header 3, the core 4 and the outlet header 5 and the side bracket 10.

  An air-cooled intercooler 11 for cooling the intake air of the engine is mounted on the front of the radiator 1 in an overlapping manner. The intercooler 11 is installed for the purpose of cooling the intake air charged by the turbocharger.

  The intercooler 11 integrally has a core 12, an inlet header (not shown) provided at the right end of the core 12, and an outlet header 13 provided at the left end of the core 12. After being introduced into the inlet header, the intake air supercharged by the compressor of the turbocharger exchanges heat with the outside air through the core 12 and is introduced into the outlet header 13. Then, it is discharged from the outlet header 13 toward the engine. Here, a cross flow type in which intake air flows from the right inlet header toward the left outlet header 13 is adopted, but a down flow type in which intake air flows downward from above may be adopted. The core 12, the inlet header (not shown) and the outlet header 13 are made of metal, in particular aluminum, which is lightweight and has a high heat exchange efficiency.

  The size (the size in the front view) of the core 12 of the intercooler 11 is smaller than the size of the core 4 of the radiator 1, and the core 12 of the intercooler 11 is disposed offset above the core 4 of the radiator 1 There is.

  Since the intercooler 11 is configured to be symmetrical in the left-right direction, only the configuration on the left side, that is, the outlet header 13 side will be mainly described below.

  As understood from FIG. 1, the outlet header 13 integrally includes an outlet header pipe 14 which extends rearward through the left side of the radiator 1. The outlet header 13 projects leftward with respect to the radiator 1, and the proximal end 15 of the outlet header pipe 14 is connected to the rear end of the projecting portion.

  The outlet header pipe 14 has a substantially trapezoidal cross-sectional shape as shown in FIG. 2 at the proximal end portion 15, but has a circular cross-sectional shape at the distal end portion 16. The other end of an intake hose (not shown) whose one end is connected to the intake manifold is connected to the tip end portion 16. The cross-sectional shape of the outlet header pipe 14 gradually changes from a substantially trapezoidal shape to a circular shape from the proximal end 15 to the distal end 16.

  On the other hand, an in-header pipe 17 is disposed in the outlet header 13. The inner header pipe 17 is configured to suction the condensed water accumulated in the outlet header 13. The header inner pipe 17 is configured by appropriately bending a metal (in this embodiment, aluminum) pipe material having a constant inner and outer diameter. The header inner pipe 17 is located near the bottom in the outlet header 13 and has an inlet end 18 as a base end facing the bottom, and an outlet end as a tip which protrudes through the outlet header 13 to the outside. And a part 19. The condensed water retained at the bottom of the outlet header 13 is sucked at the inlet end 18 and discharged from the outlet end 19.

  Although the header inner pipe 17 for suctioning condensed water is provided only in the outlet header 13 in the present embodiment, it is also possible to provide a header inner pipe for the same or other purposes in the inlet header. In this case, the configuration of the through portion described later can be applied to the inlet header side.

  The inner header pipe 17 extends upward from the inlet end 18 along the inner wall surface of the outlet header 13 and is bent in a substantially crank shape toward the right, and thereafter, on the bottom of the proximal end 15 of the outlet header pipe 14 Towards the rear side it is bent approximately at right angles to the outlet end 19. The outlet end 19 thus extends from the front to the rear. The upwardly extending portion immediately following the inlet end 18 is secured to the inner wall surface of the outlet header 13 by a plurality of clips 20.

  As shown in FIG. 1, the outlet end 19 of the header inner pipe 17 is finally connected in communication with the hose 21 via a member described later. The hose 21 is flexible and is formed of a general rubber hose in the present embodiment. The hose 21 extends rearward from the inlet end 22, which is a connecting connection with the outlet end 19, is bent substantially perpendicularly upward, and extends upward between the outlet header pipe 14 and the shroud 8. Then, it extends diagonally upward and rearward toward the engine side substantially in parallel with the outlet header pipe 14 and reaches the outlet end 23.

  The inlet end 22 is attached to a hose attachment pipe to be described later, and then tightened from the outside by a known spring clip 24 and fixed to the hose attachment pipe. Also, in the gap between the outlet header pipe 14 and the shroud 8, the hose 21 is fixed to the shroud 8 by a plurality of clips (in the embodiment, Ω-shaped clips) 25. Further, the hose 21 is fixed by a clip 27 and a bolt 28 to a boss 26 provided on the upper surface portion of the outlet header pipe 14 before the outlet end portion 23. Specifically, the clip 27 holding the hose 21 is fixed to the boss 26 by the bolt 28. The outlet end 23 is connected to the other end of another hose (not shown) whose one end is connected to the downstream side of the intake throttle valve of the engine and is supplied with the intake negative pressure. Therefore, the condensed water drawn into the header inner pipe 17 is finally burned in the combustion chamber of the engine.

  Although FIG. 1 shows an example in which the fan axis C is parallel to the longitudinal direction of the vehicle, the fan axis C may be slightly inclined with respect to the longitudinal direction of the vehicle. For example, if the engine is slightly inclined backward due to the layout of the vehicle, the fan shaft C is also slightly inclined backward.

  Next, with reference to FIG. 3, the pipe attachment structure of the present embodiment will be described. However, the inlet end 22 of the hose 21 and the spring clip 24 are not shown. The pipe attachment structure of the present embodiment is for attaching the outlet end 19 of the in-header pipe 17 to the outlet header 13 in a penetrating state.

  In the present embodiment, as shown also in FIG. 1, the outlet end 19 of the in-header pipe 17 penetrates the bottom wall 29 of the proximal end 15 of the outlet header pipe 14. The bottom wall 29 is inclined at a predetermined angle rearward and upward with respect to the front-rear direction. The bottom wall 29 is provided with a pipe insertion hole 30 along the front-rear direction, and the outlet end 19 of the inner pipe 17 is inserted into the pipe insertion hole 30 from the inside to the outside of the outlet header 13.

  As shown, the outlet end 19 of the header inner pipe 17 is a straight pipe with a constant inner and outer diameter formed simply by cutting the pipe material. The outlet end 19 thus has a constant inner diameter d1 and an outer diameter d2.

  The inner diameter D1 of the pipe insertion hole 30 is made the smallest size that the outlet end 19 can pass, and is made equal to or slightly larger than the outer diameter d2 of the outlet end 19. Thus, the gap between the pipe insertion hole 30 and the outlet end 19 is minimized.

  The outlet end 19 and the bottom wall 29 are welded from the outside of the outlet header 13 by means of a weld or first weld 31 so as to fill the gap. This welding may be brazing which can be carried out at a relatively low temperature, but in the present embodiment, argon welding is employed which can be carried out at a higher temperature to enhance the strength of the weld. As mentioned above, the outlet end 19 and the bottom wall 29 are made of aluminum.

  Note that brazing is difficult if the gap between the pipe insertion hole 30 and the outlet end 19 is large, but in the present embodiment, the gap is small, so brazing is also possible.

  Thus, the outlet end 19 is attached to the bottom wall 29 in a penetrating manner, but it is difficult to attach the inlet end 22 of the hose 21 without leaving it. Therefore, in the present embodiment, in order to make this possible, the hose attachment pipe 32 is separately provided.

  In detail, a cover member 33 is provided to cover the outlet end 19 outside the bottom wall 29, and the cover member 33 is airtightly attached to the outer surface of the bottom wall 29. In the present embodiment, the cover member 33 is welded to the outer surface of the bottom wall 29 by the second welding portion 34. However, the mounting method is optional, and for example, it may be bolted to sandwich a sealing member such as a gasket. The hose attachment pipe 32 is attached to the cover member 33 in advance. The cover member 33 and the hose attachment pipe 32 are also made of metal, and in this embodiment, made of aluminum.

  The cover member 33 is a cylindrical member with a bottom, and the front end is opened and cut obliquely at the inclination angle of the bottom wall 29 and the rear end is closed. The front end portion of the cover member 33 is welded by the second welding portion 34 in a state of being in close contact with the outer surface portion of the bottom wall 29. Since there is substantially no gap between the two, the welding of the second welded portion 34 may be brazing or argon welding. An axial and radial gap is formed between the outlet end 19 and the cover member 33 with respect to the central axis of the outlet end 19. However, these gaps may not be present.

  The hose attachment pipe 32 is made of the same pipe material as the header inner pipe 17, and thus has an inner diameter d3 and an outer diameter d4 equal to the inner diameter d1 and the outer diameter d2 of the outlet end 19. However, it is also possible to make at least one of these different. The proximal end (front end) 37 of the hose attachment pipe 32 is inserted into the pipe insertion hole 35 of the cover member 33. The inner diameter D2 of the pipe insertion hole 35 is also the smallest size through which the proximal end portion 37 of the hose attachment pipe 32 can pass, and is equal to or slightly larger than the outer diameter d4 of the hose attachment pipe 32. Thereby, the gap between the pipe insertion hole 35 and the proximal end portion 37 of the hose attachment pipe 32 is also minimized. In the present embodiment, d4 = d2, and accordingly, D2 = D1.

  The base end portion 37 and the cover member 33 are welded from the outside of the cover member 33 by the pipe welding portion 36 so as to fill the gap between the pipe insertion hole 35 and the base end portion 37. This welding may also be brazing, but in the present embodiment, argon welding is used to increase the welding strength. However, the fixing method of the both may be other than welding, and for example, a female screw may be provided in the pipe insertion hole 35, a male screw may be provided in the base end portion 37, and both may be screwed.

  Thus, in the state shown in FIG. 3 in which the cover member 33 and the hose attachment pipe 32 are assembled, the hose attachment pipe 32 and the pipe insertion hole 35 are coaxially arranged with the outlet end 19 of the in-header pipe 17. Also, although the hose attachment pipe 32 is separated from the outlet end 19, the present invention is not limited to this, and the hose attachment pipe 32 may be in contact with or in close contact with the outlet end 19. The hose attachment pipe 32 projects rearward from the cover member 33, and this projection serves as an attachment for the inlet end 22 of the hose 21. The outlet end 19 of the header inner pipe 17, the cover member 33 and the inside of the hose attachment pipe 32 communicate with each other. The rear end surface 39 of the cover member 33 is a flat surface perpendicular to the hose attachment pipe 32.

  The inlet end 22 of the hose 21 is inserted into and attached to the outside of the projecting portion of the hose attachment pipe 32. In order to prevent removal of the hose 21 after attachment, an enlarged diameter portion 38 projecting outward in the radial direction with respect to the central axis is provided at the front end (rear end) of the hose attachment pipe 32.

  In the present embodiment, the enlarged diameter portion 38 is formed by well-known bulge processing. In addition to the bulge processing, known processing methods such as bead processing and spool processing can be adopted. Although only one enlarged diameter portion 38 of the present embodiment is provided at the position of the front end (rear end) of the hose attachment pipe 32, the present invention is not limited to this, and may be provided at an intermediate position or plurally. . The enlarged diameter portion 38 naturally has an outer diameter d5 larger than the reference outer diameter d4 of the hose attachment pipe 32.

  Accordingly, the inner diameter D1 of the pipe insertion hole 30 is equal to or larger than the outer diameter d2 of the outlet end 19 of the inner pipe 17 and smaller than the outer diameter d5 of the enlarged diameter portion 38. In other words, the inner diameter D1 of the pipe insertion hole 30 is substantially equal to the outer diameter d2 of the outlet end 19 and smaller than the outer diameter d5 of the enlarged diameter portion 38.

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

  As a comparative example, it is conceivable that the enlarged diameter portion 38 is provided at the tip of the outlet end 19 of the inner pipe 17 and the inlet end 22 of the hose 21 is directly attached to the outlet end 19. However, in this case, when the outlet end 19 is to be inserted into the pipe insertion hole 30 from the inside to the outside of the outlet header 13, the inner diameter D1 of the pipe insertion hole 30 is equal to or larger than the outer diameter d5 of the enlarged diameter portion 38. The gap between the pipe insertion hole 30 and the outlet end 19 is increased.

  Because the gap is large, brazing is difficult when welding the outlet end 19, and it is necessary to use a higher temperature argon welding. And since the gap is large, the amount of welding increases or the welding time becomes long. As a result, the outlet end 19 of the header inner pipe 17 may be melted away by the heat of welding, and the outlet end 19 may be clogged or punctured.

  On the other hand, in the present embodiment, since the enlarged diameter portion 38 is not provided at the outlet end 19, the pipe insertion hole 30 can be formed in the minimum size (inner diameter D1) through which the outlet end 19 passes. And the clearance gap between the outlet end 19 and the pipe insertion hole 30 after insertion can be made extremely small. Therefore, the outlet end 19 can be welded with the minimum welding amount and welding time, and the erosion of the outlet end 19 and hence the clogging and the hole opening can be suppressed. Low temperature brazing is also possible, which is also advantageous for suppressing erosion at the outlet end 19.

  Further, in the present embodiment, the outlet end portion 19 projecting outward from the outlet header pipe 14 is covered with the cover member 33 attached to the outlet header pipe 14, and the hose attachment pipe having the enlarged diameter portion 38 on the cover member 33. 32 are provided in communication with the outlet end 19. Therefore, by attaching the hose 21 to the hose attachment pipe 32, the hose 21 and the outlet end 19 can be substantially connected in communication, and the suction negative pressure from the hose 21 is sent to the inner pipe 17 to efficiently conduct the condensed water. It can be aspirated.

  Further, since the outlet end 19 and the hose attachment pipe 32 are arranged coaxially, the negative suction pressure can be smoothly transmitted from the hose attachment pipe 32 to the outlet end 19. This is also advantageous for improving the suction efficiency of the condensed water.

  Further, since the rear end surface 39 of the cover member 33 is a flat surface perpendicular to the hose attachment pipe 32, the tip end surface (front end surface) of the hose 21 abuts on the rear end surface 39 all the way. Pressure leakage can be suppressed. The spring clip 24 clamps the hose 21 at a position between the enlarged diameter portion 38 and the rear end surface 39 and brings the hose 21 into close contact with the hose attachment pipe 32.

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

  FIG. 4 shows a first example of the second embodiment. In the present embodiment, the cover member 33 and the hose attachment pipe 32 described above are not provided, and the enlarged diameter portion 38 is directly provided at the outlet end 19. However, in order to minimize the gap between the outlet end 19 and the pipe insertion hole 30, the outlet end 19 is devised.

  That is, at the outlet end 19, the first enlarged diameter portion 40 positioned in the pipe insertion hole 30 and the hose attachment portion 41 positioned on the tip end side (rear end side) of the first enlarged diameter portion 40 Is formed. Then, the above-mentioned enlarged diameter portion 38, that is, the second enlarged diameter portion 38 is formed in the hose attachment portion 41 in order to prevent the hose from coming off. The first enlarged diameter portion 40 is welded to the bottom wall 29 by a welding portion 42 so as to fill a gap with the pipe insertion hole 30.

  The outlet end 19 has a constant inner diameter d1, that is, the first enlarged diameter portion 40 and the hose attachment portion 41 (except for the portion where the second enlarged diameter portion 38 is formed) have the same inner diameter d1. In contrast, the outer diameter of the outlet end 19 is changed in the longitudinal direction. The outer diameter d2 'of the first enlarged diameter portion 40 is larger than the outer diameter d4 of the hose attachment portion 41 and is equal to the outer diameter d5 of the second enlarged diameter portion 38. The outer diameter d2 'of the first enlarged diameter portion 40 may be larger than the outer diameter d5 of the second enlarged diameter portion 38. Such expansion and contraction of the outer diameter is performed by changing the thickness of the outlet end 19. That is, the thickness t1 of the first enlarged diameter portion 40 is larger than the thickness t2 of the hose attachment portion 41. Since the second enlarged diameter portion 38 is bulged, the hose attachment portion 41 has a substantially constant thickness t2 including the portion where the second enlarged diameter portion 38 is formed.

  The outer diameter d4 of the hose attachment portion 41 is equal to the outer diameter of the pipe material. The first enlarged diameter portion 40 is terminated at a position on the non-illustrated inlet side near the pipe insertion hole 30. That is, the header inner pipe 17 is expanded in diameter only at the first enlarged diameter portion 40 and the second enlarged diameter portion 38, and the other portion has an outer diameter equal to the pipe material. This makes it possible to minimize the amount of material required to produce the in-header pipe 17.

  The inner diameter D1 'of the pipe insertion hole 30 is set to a minimum size through which the first enlarged diameter portion 40 can pass, and is set to be equal to or slightly larger than the outer diameter d2' of the first enlarged diameter portion 40. Thereby, the gap between the pipe insertion hole 30 and the first enlarged diameter portion 40 is minimized.

  The inner diameter D1 'of the pipe insertion hole 30 is set to be equal to or larger than the outer diameter d5 of the second enlarged diameter portion 38 so that the second enlarged diameter portion 38 can pass through at the time of assembly. In the present embodiment, since the outer diameter d2 'of the first enlarged diameter portion 40 and the outer diameter d5 of the second enlarged diameter portion 38 are equal, the inner diameter D1' of the pipe insertion hole 30 is the outer diameter of the second enlarged diameter portion 38. The size is equal to or slightly larger than d5.

  Thus, the inner diameter D1 'of the pipe insertion hole 30 is equal to or larger than the outer diameter d2' of the first enlarged diameter portion 40 and equal to or larger than the outer diameter d5 of the second enlarged diameter portion 38.

  Since the gap between the pipe insertion hole 30 and the first enlarged diameter portion 40 is minimum, the welding of the welding portion 42 may be brazing or argon welding. Although only one second enlarged diameter portion 38 is provided at the front end (rear end) of the hose attachment portion 41 by bulge processing, the processing method, position, number, and the like can be changed.

  According to the present embodiment, since the inner diameter D1 ′ of the pipe insertion hole 30 is determined as described above, the first enlarged diameter portion 40 and the second enlarged diameter portion 38 are directed from the inside to the outside of the outlet header 13 at the time of assembly. Can be inserted into the pipe insertion hole 30. Then, after the first enlarged diameter portion 40 is positioned in the pipe insertion hole 30, the first enlarged diameter portion 40 can be welded to the bottom wall 29 so as to fill these minimum gaps. Therefore, as in the first embodiment, the outlet end 19 can be welded with the minimum welding amount and welding time, and the erosion of the outlet end 19 and, consequently, the clogging and perforation can be suppressed.

  Further, in the present embodiment, since the outer diameter d2 'of the first enlarged diameter portion 40 and the outer diameter d5 of the second enlarged diameter portion 38 are equal, both enlarged diameter portions pass through the inner diameter D1' of the pipe insertion hole 30. It can be the smallest possible size. Therefore, the rigidity of the outlet header 13 is advantageously increased without increasing the diameter of the pipe insertion hole 30.

  Further, in the present embodiment, the first enlarged diameter portion 40 is larger in diameter and thicker than the hose attachment portion 41, and has the same inner diameter as the hose attachment portion 41. Therefore, the first enlarged diameter portion 40 can be easily formed only by changing the outer diameter and the wall thickness at the time of forming and processing the outlet end portion 19.

  Next, a second example of the second embodiment will be described with reference to FIG. The present embodiment is substantially the same as the first embodiment, except that a cylindrical boss 44 is provided on the bottom wall 29, and the outlet end 19 is attached by penetrating the cylindrical boss 44. .

  The bosses 44 are made of metal, in this embodiment, aluminum, and are formed in a cylindrical shape, and are welded to the outer surface portion of the bottom wall 29 coaxially with the pipe insertion holes 30. Here, although the structure which welds the boss 44 separately is shown, the boss 44 may be integrally formed on the bottom wall 29. The bosses 44 are considered to be part of the bottom wall 29, ie the outlet header 13.

  The front end of the boss 44 is obliquely cut in accordance with the inclination angle of the bottom wall 29 and is welded to the bottom wall 29 in a close contact state. The insertion hole 45 of the boss 44 is coaxially disposed adjacent to the pipe insertion hole 30 and has the same inner diameter as the inner diameter D 1 ′ of the pipe insertion hole 30.

  The position of the rear end of the first enlarged diameter portion 40 is approximately aligned with the position of the rear end face 46 of the boss 44. In the present embodiment, the rear end of the first enlarged diameter portion 40 is located slightly behind the rear end surface 46 of the boss 44. The first enlarged diameter portion 40 is welded to the rear end face 46 of the boss 44 by the welding portion 42. The rear end face 46 of the boss 44 is a flat surface perpendicular to the hose attachment portion 41.

  According to the present embodiment, in addition to the above-mentioned operation and effect, the end face (front end face) of the hose 21 can be abutted all around the rear end face 46 of the boss 44 to suppress leakage of suction negative pressure from the gap between these end faces. .

  Next, a third example of the second embodiment will be described with reference to FIG. In the first embodiment (FIG. 4), while the inner diameter of the outlet end 19 is constant (d1), the thickness of the outlet end 19 is changed, and the outer diameter of the outlet end 19 is changed. On the other hand, in the present embodiment, the inner diameter and the outer diameter are changed while keeping the thickness (t2) of the outlet end 19 constant. Therefore, the first enlarged diameter portion 40, the hose attachment portion 41 and the second enlarged diameter portion 38 have the same thickness t2. The thickness t2 is equal to the thickness of the pipe material.

  The first enlarged diameter portion 40, the hose attachment portion 41 and the second enlarged diameter portion 38 have outer diameters d2 ', d4 and d5 respectively similar to those of the first embodiment. The pipe insertion hole 30 also has an inner diameter D1 'similar to that of the first embodiment. Accordingly, the hose attachment portion 41 has the same inner diameter d1 as the first embodiment, and the inner diameter of the second enlarged diameter portion 38 changes in accordance with the change in the outer diameter while the thickness remains constant at t2. However, the first enlarged diameter portion 40 has an inner diameter d1 ′ ′ larger than that of the first embodiment.

  In the present embodiment, as in the first embodiment, the bosses 44 as in the second embodiment (FIG. 5) are not provided. The first enlarged diameter portion 40 is inserted and welded only into the pipe insertion hole 30 of the bottom wall 29.

  Also according to this embodiment, the same function and effect as those of the first embodiment can be obtained. Further, in the present embodiment, since the first enlarged diameter portion 40, the hose attachment portion 41, and the second enlarged diameter portion 38 have the same thickness t2, when forming and processing the outlet end 19, the pipe material of a fixed thickness is used. The first enlarged diameter portion 40, the hose attachment portion 41 and the second enlarged diameter portion 38 can be easily formed only by changing the inner and outer diameters.

  Next, a fourth example of the second embodiment will be described with reference to FIG. In this embodiment, a boss 44 as in the second embodiment is added to the configuration of the third embodiment. Therefore, this embodiment can exhibit the same function and effect as the second embodiment.

  Although the embodiments of the present invention have been described in detail, various other embodiments of the present invention are conceivable.

  (1) For example, welding of each welding part is also possible other than brazing and argon welding.

  (2) Further, the heat exchanger is not limited to the intercooler, and the pipe in the header is not limited to the condensed water suction.

  The configurations of the embodiments and examples described above can be partially or totally combined unless there is a particular contradiction. The embodiments of the present invention are not limited to the above-described embodiments, and all variations, applications, and equivalents included in the concept of the present invention defined by the claims are included in the present invention. Accordingly, the present invention should not be interpreted in a limited manner, and can be applied to any other technology falling within the scope of the present invention.

11 intercooler 13 outlet header 17 header inner pipe 19 outlet end 30 pipe insertion hole 31 first welded portion 32 hose mounting pipe 33 cover member 38 enlarged diameter portion, second enlarged diameter portion 40 first expanded diameter portion 41 hose mounting portion 42 welds

Claims (9)

A pipe insertion hole provided in the header of the heat exchanger;
An in-header pipe having a tip portion with a constant outer diameter, which is inserted into the pipe insertion hole;
A weld for welding the tip of the pipe in the header to the header;
A cover member attached to the outer surface of the header and covering the tip of the inner pipe;
A hose attachment pipe provided on the cover member and having an enlarged diameter portion;
Equipped with
The pipe mounting structure of a heat exchanger, wherein an inner diameter of the pipe insertion hole is equal to or larger than an outer diameter of a tip portion of the inner pipe and smaller than an outer diameter of the enlarged diameter portion. The pipe mounting structure of a heat exchanger according to claim 1, wherein a tip portion of the header inner pipe and the hose mounting pipe are coaxially arranged. A pipe insertion hole provided in the header of the heat exchanger;
An in-header pipe having a tip end that is inserted into the pipe insertion hole;
A first enlarged diameter portion formed at the tip of the header inner pipe and positioned in the pipe insertion hole;
A hose attachment portion formed at the tip end of the header inner pipe and positioned on the tip end side of the first enlarged diameter portion;
A second enlarged diameter portion formed in the hose attachment portion;
A weld for welding the first enlarged diameter portion to the header;
Equipped with
The pipe mounting structure of a heat exchanger, wherein an inner diameter of the pipe insertion hole is equal to or larger than an outer diameter of the first enlarged diameter portion and equal to or larger than an outer diameter of the second enlarged diameter portion. The pipe mounting structure of a heat exchanger according to claim 3, wherein the outer diameter of the first enlarged diameter portion has a size equal to the outer diameter of the second enlarged diameter portion. The pipe mounting structure of a heat exchanger according to claim 3 or 4, wherein the first enlarged diameter portion is larger in diameter and thicker than the hose mounting portion and has the same inner diameter as the hose mounting portion. The pipe attachment structure of the heat exchanger according to claim 3 or 4, wherein the first enlarged diameter portion, the hose attachment portion, and the second enlarged diameter portion have the same thickness. The pipe mounting structure of a heat exchanger according to any one of claims 1 to 6, wherein the heat exchanger is an intercooler for cooling the intake air of an engine. The heat exchanger pipe mounting structure according to claim 7, wherein the header is an outlet header for discharging the cooled intake air. 9. The heat exchanger pipe mounting structure according to claim 8, wherein the in-header pipe is disposed in the outlet header and configured to suction condensed water accumulated in the outlet header.

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