JP6919282B2 - Heat exchanger pipe mounting structure - Google Patents

Description

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

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, a pipe insertion hole is provided in the header, and the tip of the pipe in the header is inserted into the pipe insertion hole from the inside to the outside of the header. Then, from the outside of the header, the tip of the pipe in the header is welded to the header so as to close the gap between the pipe tip in the header and the pipe insertion hole.

Utility Model Registration No. 3084366 Gazette

However, the tip of the pipe in the header is planned to be attached by inserting another hose, and the tip of the pipe in the header is formed with an enlarged diameter portion for preventing the hose from coming off. In this case, the inner diameter of the pipe insertion hole is set to be larger than the outer diameter of the enlarged diameter portion so that the enlarged diameter portion can pass through the pipe insertion hole.

Then, when an attempt is made to weld the tip of the pipe in the header to the header in a part other than the enlarged diameter portion, the gap between that part and the pipe insertion hole is large, so that the welding amount increases or the welding time becomes long, and the tip of the pipe in the header There is a problem that the portion is melted by the heat of welding and the tip of the pipe in the header is clogged or perforated.

Therefore, the present invention was conceived in view of such circumstances, and an object of the present invention is to provide a pipe mounting structure of a heat exchanger capable of suppressing melting damage due to welding of a pipe tip portion in a header.

According to one aspect of the invention
The pipe insertion hole provided in the header of the heat exchanger and
A pipe in the header having a tip having a constant outer diameter to be inserted into the pipe insertion hole,
A welded portion that welds the tip of the pipe in the header to the header, and
A cover member attached to the outer surface of the header and covering the tip of the pipe inside the header.
A hose mounting pipe provided on the cover member and having an enlarged diameter portion,
With
Provided is a pipe mounting structure for a heat exchanger, wherein the inner diameter of the pipe insertion hole has a size equal to or larger than the outer diameter of the tip end portion of the header inner pipe and smaller than the outer diameter of the enlarged diameter portion. ..

Preferably, the tip of the pipe in the header and the hose mounting pipe are coaxially arranged.

According to another aspect of the invention
The pipe insertion hole provided in the header of the heat exchanger and
A pipe in the header having a tip to be inserted into the pipe insertion hole,
A first diameter-expanded portion formed at the tip of the pipe in the header and located in the pipe insertion hole,
A hose attachment portion formed at the tip end of the pipe in the header and located on the tip end side of the first diameter expansion portion, and a hose attachment portion.
A second diameter-expanded portion formed on the hose attachment portion and
A welded portion for welding the first enlarged diameter portion to the header, and a welded portion.
With
Provided is a pipe mounting structure for a heat exchanger, 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 larger than the outer diameter of the second enlarged diameter portion. NS.

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 has a larger diameter and a thicker wall than the hose attachment portion, and has the same inner diameter as the hose attachment portion.

Preferably, the first diameter-expanded portion, the hose attachment portion, and the second diameter-expanded portion have the same wall 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 in-header pipe may be arranged in the outlet header and configured to suck the condensed water accumulated in the outlet header.

According to the present invention, it is possible to suppress melting damage due to welding of the tip of the pipe in the header.

It is the schematic side view of the engine cooling system of the vehicle to which 1st Embodiment is applied. It is a partial front view which shows the structure of the left side of an engine cooling system. It is a detailed view of Part III of FIG. FIG. 3 is a detailed equivalent diagram of Part III of the first embodiment of the second embodiment. It is a detailed equivalent diagram of Part III of the 2nd Example of the 2nd Embodiment. It is a detailed equivalent diagram of Part III of the 3rd Example of the 2nd Embodiment. It is a detailed equivalent diagram of Part III of the 4th Example of the 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The pipe mounting structure of the heat exchanger according to the embodiment of the present invention relates to a structure in which the pipe in the header is mounted on the header of the 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 for a vehicle to which the first embodiment of the present invention is applied. The vehicle and the 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 types and uses 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 the three orthogonal axes, that is, each direction of front, back, left, right, up and down is defined as shown in the figure. However, please note that each direction is defined for convenience only for the sake of easy understanding of the explanation. Each direction of the front, rear, left, right, up and down of the illustrated example coincides with each direction of the vehicle. The engine is installed vertically in the vehicle, and radiators 1 are arranged in front of the engine at intervals.

The engine cooling device includes a radiator 1 attached to the vehicle body (not shown). Here, "attached" includes not only the case where it is directly attached to the object to be attached, but also the case where it is indirectly attached to the object to be attached via an intermediate structure (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 into the inlet header 3 to exchange heat with the outside air, and cooling after passing through the core 4. It integrally has an outlet header 5 into which water is introduced and discharged toward the engine. Here, a down-flow type in which cooling water flows from the upper inlet header 3 toward the lower outlet header 5 is adopted, but a cross-flow type in which cooling water flows in the lateral direction may be adopted. The radiator 1 is arranged perpendicular to the central axis (referred to as a fan axis) C of a fan (not shown) described later, that is, is arranged in an upright state, and is attached to the vehicle body via a bracket (not shown). The radiator 1 may be arranged so as to be inclined with respect to the direction perpendicular to the fan shaft C. As is well known, the radiator 1 has a quadrangular shape when viewed from the front. The radiator 1 is arranged forward at the front end of the vehicle and receives the running wind from the front when the vehicle is running. The fan shaft C is parallel to the crankshaft axial 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 to supply cooling water. Further, an outlet pipe 7 is integrally provided in the outlet header 5, and the outlet pipe 7 is connected to a discharge hose (not shown) extending from the engine side to discharge cooling water.

A resin shroud 8 is attached to the rear surface portion or the back 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 contacted with the outer peripheral portion of the fan ring, and a fan rotationally driven by the engine is installed coaxially and with a minute gap inside the fan ring in the radial direction. .. Since these are well known, their description will be omitted. The fan ring and fan are attached to the engine.

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

An air-cooled intercooler 11 for cooling the intake air of the engine is superposed on the front portion of the radiator 1. The intercooler 11 is installed for the purpose of cooling the intake air supercharged by the turbocharger.

The intercooler 11 integrally includes a core 12, an inlet header (not shown) provided at the right end of the core 12, and an exit header 13 provided at the left end of the core 12. The intake air supercharged by the compressor of the turbocharger is introduced into the inlet header, then 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 inlet header on the right side to the outlet header 13 on the left side is adopted, but a down-flow type in which intake air flows from above to below may be adopted. The core 12, the inlet header (not shown) and the outlet header 13 are made of metal, particularly lightweight and highly heat exchange efficient aluminum.

The size of the core 12 of the intercooler 11 (the size in the front view) is smaller than the size of the core 4 of the radiator 1, and the core 12 of the intercooler 11 is arranged so as to be offset upward with respect to the core 4 of the radiator 1. There is.

Since the intercooler 11 has a symmetrical configuration, only the configuration on the left side, that is, the exit header 13 side will be mainly described below.

As can be seen from FIG. 1, the outlet header 13 integrally includes an outlet header pipe 14 that passes through the left side of the radiator 1 and extends rearward. The outlet header 13 projects to the left with respect to the radiator 1, and the base end portion 15 of the outlet header pipe 14 is connected to the rear end of the protruding portion.

The outlet header pipe 14 has a substantially trapezoidal cross-sectional shape at the base end portion 15 as shown in FIG. 2, but has a circular cross-sectional shape at the tip 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 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 base end portion 15 to the tip end portion 16.

On the other hand, an in-header pipe 17 is arranged in the exit header 13. The header pipe 17 is configured to suck the condensed water accumulated in the outlet header 13. The header inner pipe 17 is formed by appropriately bending a metal (aluminum in the present embodiment) pipe material having a constant inner and outer diameter. The header pipe 17 has an inlet end 18 as a base end located near the bottom of the outlet header 13 and facing the bottom, and an outlet end as a tip that penetrates the outlet header 13 and protrudes to the outside. It has a part 19. Then, the condensed water accumulated at the bottom of the outlet header 13 is sucked at the inlet end 18 and discharged from the outlet end 19.

In the present embodiment, the in-header pipe 17 for sucking condensed water is provided only in the outlet header 13, but it is also possible to provide the same or other purpose in-header pipe in the inlet header. In this case, the structure of the penetrating portion described later can be applied to the entrance header side as well.

The header pipe 17 extends upward from the inlet end 18 and is bent in a substantially crank shape toward the right side along the inner wall surface of the outlet header 13, and then is formed at the bottom of the base end 15 of the outlet header pipe 14. It is bent at a substantially right angle toward the rear side and reaches the outlet end portion 19. Therefore, the exit end 19 extends from the front to the rear. The portion extending upward immediately after the entrance end portion 18 is fixed to the inner wall surface of the exit header 13 by a plurality of clips 20.

As shown in FIG. 1, the outlet end 19 of the header pipe 17 is finally communicated and connected to the hose 21 via a member described later. The hose 21 is flexible and is formed from a common rubber hose in this embodiment. The hose 21 extends rearward from the inlet end 22 which is a communication connection portion with the outlet end 19, is bent upward at a substantially right angle, and extends upward through the gap between the outlet header pipe 14 and the shroud 8. Then, substantially parallel to the outlet header pipe 14, it extends diagonally upward and backward toward the engine side and reaches the outlet end portion 23.

The inlet end 22 is attached to a hose attachment pipe, which will be described later, and then tightened from the outside by a well-known spring clip 24 to be fixed to the hose attachment pipe. Further, 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 (Ω-shaped clips in this embodiment) 25. Further, the hose 21 is fixed to the boss 26 provided on the upper surface of the outlet header pipe 14 by the clip 27 and the bolt 28 in front of the outlet end 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) having one end connected to the downstream side of the intake throttle valve of the engine to supply a negative intake pressure. Therefore, the condensed water sucked into the pipe 17 in the header is finally burned in the combustion chamber of the engine.

Although FIG. 1 shows an example in which the fan shaft C is parallel to the vehicle front-rear direction, the fan shaft C may be slightly inclined with respect to the vehicle front-rear direction. For example, when the engine is arranged to be slightly tilted backward due to reasons such as vehicle layout, the fan shaft C is also tilted slightly backward.

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

In the present embodiment, as shown in FIG. 1, the outlet end portion 19 of the header inner pipe 17 penetrates the bottom wall 29 of the base end portion 15 of the outlet header pipe 14. The bottom wall 29 is inclined rearward and diagonally upward at a predetermined angle 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 header inner pipe 17 is inserted into the pipe insertion hole 30 from the inside to the outside of the outlet header 13.

As shown in the figure, the outlet end 19 of the header inner pipe 17 is a straight pipe having a constant inner and outer diameter formed by simply cutting the pipe material. Therefore, the outlet end 19 has a constant inner diameter d1 and outer diameter d2.

The inner diameter D1 of the pipe insertion hole 30 is set to the minimum size through which the outlet end portion 19 can pass, and is set to a size equal to or slightly larger than the outer diameter d2 of the outlet end portion 19. As a result, 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 a welded portion, that is, a first welded portion 31 so as to fill this gap. This welding may be brazing that can be performed at a relatively low temperature, but in the present embodiment, argon welding that is performed at a higher temperature and can increase the strength of the welded portion is adopted. As described above, the outlet end 19 and the bottom wall 29 are made of aluminum.

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

In this way, the outlet end 19 is attached to the bottom wall 29 in a penetrating state, but with this alone, it is difficult to attach the hose 21 so as not to come off the inlet end 22. Therefore, in the present embodiment, a hose attachment pipe 32 is separately provided to enable this.

Specifically, a cover member 33 that covers the outlet end portion 19 is provided outside the bottom wall 29, and the cover member 33 is airtightly attached to the outer surface portion of the bottom wall 29. In the present embodiment, the cover member 33 is welded to the outer surface portion of the bottom wall 29 by the second welded portion 34. However, the mounting method is arbitrary, and for example, a sealing member such as a gasket may be sandwiched and bolted. A 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, they are made of aluminum.

The cover member 33 is a bottomed tubular member, the front end portion thereof is opened and the cover member 33 is cut diagonally according to the inclination angle of the bottom wall 29, and the rear end portion is closed. The front end portion of the cover member 33 is welded by the second welded 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. A gap in the axial direction and the radial direction with respect to the central axis of the outlet end portion 19 is formed between the outlet end portion 19 and the cover member 33. However, these gaps may not be present.

Since the hose mounting pipe 32 is made of the same pipe material as the pipe 17 in the header, it 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 portion 19. However, it is possible to make at least one of these different. The base end portion (front end portion) 37 of the hose mounting 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 set to the minimum size through which the base end portion 37 of the hose mounting pipe 32 can pass, and is set to a size equal to or slightly larger than the outer diameter d4 of the hose mounting pipe 32. As a result, the gap between the pipe insertion hole 35 and the base end portion 37 of the hose mounting pipe 32 is also minimized. Since d4 = d2 in this embodiment, D2 = D1 is set accordingly.

The base end portion 37 and the cover member 33 are welded by the pipe welded portion 36 from the outside of the cover member 33 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, it is argon welding that increases the welding strength. However, the method of fixing both may be other than welding. 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 together.

In the state shown in FIG. 3 in which the cover member 33 and the hose mounting pipe 32 are assembled in this way, the hose mounting pipe 32 and the pipe insertion hole 35 are arranged coaxially with the outlet end 19 of the pipe 17 in the header. Further, although the hose attachment pipe 32 is separated from the outlet end portion 19, the hose attachment pipe 32 may be in contact with or in close contact with the outlet end portion 19. The hose mounting pipe 32 projects rearward from the cover member 33, and this protruding portion serves as a mounting portion for the inlet end portion 22 of the hose 21. The outlet end 19 of the header pipe 17, the cover member 33, and the inside of the hose mounting pipe 32 communicate with each other. The rear end surface 39 of the cover member 33 is a flat surface perpendicular to the hose mounting pipe 32.

The inlet end 22 of the hose 21 is inserted and attached to the outside of the protruding portion of the hose attachment pipe 32. In order to prevent the hose 21 from coming off after mounting, the tip end (rear end portion) of the hose mounting pipe 32 is provided with a diameter-expanded portion 38 projecting outward in the radial direction with respect to the central axis thereof.

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

Therefore, the inner diameter D1 of the pipe insertion hole 30 is set to have a size of not more than the outer diameter d2 of the outlet end 19 of the header inner pipe 17 and less than the outer diameter d5 of the enlarged diameter portion 38. More specifically, the inner diameter D1 of the pipe insertion hole 30 is substantially equal to the outer diameter d2 of the outlet end portion 19 and smaller than the outer diameter d5 of the enlarged diameter portion 38.

Next, the action 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 portion 19 of the pipe 17 in the header, and the inlet end portion 22 of the hose 21 is directly attached to the outlet end portion 19. However, in this case, when the outlet end 19 is 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 set to the outer diameter d5 or more of the enlarged diameter portion 38. The gap between the pipe insertion hole 30 and the outlet end 19 becomes large.

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

On the other hand, in the present embodiment, since the diameter-expanded portion 38 is not provided at the outlet end portion 19, the pipe insertion hole 30 can be formed in the minimum size (inner diameter D1) through which the outlet end portion 19 passes. Then, the gap between the outlet end 19 and the pipe insertion hole 30 after insertion can be made extremely small. Therefore, the outlet end portion 19 can be welded with the minimum welding amount and welding time, and melting damage of the outlet end portion 19, and by extension, blockage and perforation can be suppressed. In addition, low-temperature brazing becomes possible, which is also advantageous in suppressing melting damage of the outlet end portion 19.

Further, in the present embodiment, the outlet end 19 protruding outward from the outlet header pipe 14 is covered with a cover member 33 attached to the outlet header pipe 14, and the cover member 33 has a hose attachment pipe having a diameter-expanded portion 38. 32 is provided so as to communicate with the outlet end portion 19. Therefore, by attaching the hose 21 to the hose attachment pipe 32, the hose 21 and the outlet end 19 can be substantially communicated with each other, and the suction negative pressure from the hose 21 is sent to the pipe 17 in the header to efficiently discharge the condensed water. Can be aspirated.

Further, since the outlet end 19 and the hose attachment pipe 32 are arranged coaxially, the suction negative 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 condensed water.

Further, since the rear end surface 39 of the cover member 33 is a flat surface perpendicular to the hose mounting pipe 32, the front end surface (front end surface) of the hose 21 is abutted against the rear end surface 39 all around, and suction is negative from the gap between these end surfaces. Pressure leakage can be suppressed. The spring clip 24 tightens the hose 21 at a position between the enlarged diameter portion 38 and the rear end surface 39 so as to be brought into close contact with the hose mounting pipe 32.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. The same parts as those in the above-described first embodiment are designated by the same reference numerals in the drawings, and the description thereof will be omitted, and the differences will be mainly described below.

FIG. 4 shows a first embodiment 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 diameter-expanded portion 38 is directly provided at the outlet end portion 19. However, the outlet end 19 has been devised so as to minimize the gap between the outlet end 19 and the pipe insertion hole 30.

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

The outlet end portion 19 has a constant inner diameter d1, that is, the first diameter-expanded portion 40 and the hose attachment portion 41 (excluding the portion where the second diameter-expanded portion 38 is formed) have the same inner diameter d1. On the other hand, the outer diameter of the outlet end 19 is changed in the longitudinal direction. The outer diameter d2'of the first diameter-expanded portion 40 is made larger than the outer diameter d4 of the hose attachment portion 41 and equal to the outer diameter d5 of the second diameter-expanded portion 38. The outer diameter d2'of the first diameter-expanded portion 40 may be made larger than the outer diameter d5 of the second diameter-expanded portion 38. Such expansion / contraction of the outer diameter is performed by changing the wall thickness of the outlet end portion 19. That is, the wall thickness t1 of the first enlarged diameter portion 40 is made larger than the wall thickness t2 of the hose attachment portion 41. Since the second diameter-expanded portion 38 is bulged, the hose attachment portion 41 has a substantially constant wall thickness t2 including the portion where the second diameter-expanded 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 diameter-expanded portion 40 is terminated at a position on the outside entrance side near the pipe insertion hole 30. That is, the diameter of the pipe 17 in the header is expanded only in the first diameter-expanded portion 40 and the second diameter-expanded portion 38, and the other portions have the same outer diameter as the pipe material. As a result, the amount of material required for manufacturing the header pipe 17 can be minimized.

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

Further, the inner diameter D1'of the pipe insertion hole 30 is set to a size 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 during assembly. In the present embodiment, 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 to each other, so that 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.

In this way, the inner diameter D1'of the pipe insertion hole 30 has a size equal to or larger than the outer diameter d2'of the first diameter-expanded portion 40 and equal to or larger than the outer diameter d5 of the second diameter-expanded portion 38.

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

According to this embodiment, since the inner diameter D1'of the pipe insertion hole 30 is determined as described above, the first diameter-expanded portion 40 and the second diameter-expanded portion 38 are set from the inside to the outside of the outlet header 13 at the time of assembly. Both can be inserted into the pipe insertion hole 30. Then, after positioning the first diameter-expanded portion 40 in the pipe insertion hole 30, the first diameter-expanded 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 portion 19 can be welded with the minimum welding amount and welding time, and melting damage of the outlet end portion 19, and by extension, blockage and perforation can be suppressed.

Further, in this 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 made equal, both the enlarged diameter portions pass through the inner diameter D1'of the pipe insertion hole 30. It can be the smallest possible size. Therefore, it is advantageous to increase the rigidity of the outlet header 13 without increasing the diameter of the pipe insertion hole 30.

Further, in this embodiment, the first enlarged diameter portion 40 has a larger diameter and a thicker wall than the hose mounting portion 41, and has the same inner diameter as the hose mounting portion 41. Therefore, the first diameter-expanded portion 40 can be easily formed only by changing the outer diameter and the wall thickness during the molding process of the outlet end portion 19.

Next, a second embodiment of the second embodiment will be described with reference to FIG. This embodiment is almost the same as that of the first embodiment, but differs from the first embodiment only in that a tubular boss 44 is provided on the bottom wall 29 and the outlet end 19 is attached through the boss 44. ..

The boss 44 is made of metal, aluminum in this embodiment, is formed in a cylindrical shape, and is welded to the outer surface of the bottom wall 29 coaxially with the pipe insertion hole 30. Here, the structure in which the boss 44 is welded as a separate body is shown, but the boss 44 may be integrally formed with the bottom wall 29. The boss 44 is considered to be part of the bottom wall 29, the exit header 13.

The front end portion of the boss 44 is cut diagonally according to the inclination angle of the bottom wall 29 and welded to the bottom wall 29 in close contact with the bottom wall 29. The insertion hole 45 of the boss 44 is coaxially arranged adjacent to the pipe insertion hole 30 so as to be continuous, and has the same inner diameter as the inner diameter D1'of the pipe insertion hole 30.

The position of the rear end of the first enlarged diameter portion 40 is roughly matched with the position of the rear end surface 46 of the boss 44. In this embodiment, the rear end of the first enlarged diameter portion 40 is located slightly behind the rear end surface 46 of the boss 44. Then, the first enlarged diameter portion 40 is welded to the rear end surface 46 of the boss 44 by the welded portion 42. The rear end surface 46 of the boss 44 is a flat surface perpendicular to the hose attachment portion 41.

According to this embodiment, in addition to the above-mentioned effects, the front end surface (front end surface) of the hose 21 is abutted against the rear end surface 46 of the boss 44 all around, and leakage of suction negative pressure from the gap between these end surfaces can be suppressed. ..

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

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

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

Also in this example, the same action and effect as in the first embodiment can be obtained. Further, in this embodiment, since the first diameter-expanded portion 40, the hose attachment portion 41, and the second diameter-expanded portion 38 have the same wall thickness t2, the pipe material having a constant wall thickness is used during the molding process of the outlet end portion 19. The first diameter-expanded portion 40, the hose attachment portion 41, and the second diameter-expanded portion 38 can be easily formed only by changing the inner and outer diameters.

Next, a fourth embodiment of the second embodiment will be described with reference to FIG. 7. In this embodiment, the boss 44 as in the second embodiment is added to the configuration of the third embodiment. Therefore, this embodiment can exhibit the same effects as those of the second embodiment.

Although the embodiments of the present invention have been described in detail above, various other embodiments of the present invention can be considered.

(1) For example, welding of each welded portion can be performed 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 suction of condensed water.

The configurations of each of the above embodiments and embodiments can be combined partially or wholly, unless otherwise inconsistent. The embodiment of the present invention is not limited to the above-described embodiment, and all modifications, applications, and equivalents included in the idea of the present invention defined by the claims are included in the present invention. Therefore, the present invention should not be construed in a limited manner and can be applied to any other technique belonging to the scope of the idea of the present invention.

11 Intercooler 13 Outlet header 17 Pipe in header 19 Outlet end 30 Pipe insertion hole 31 First weld 32 Hose mounting pipe 33 Cover member 38 Diameter expansion part, second diameter expansion part 40 First diameter expansion part 41 Hose mounting part 42 Welded part

Claims (5)

The pipe insertion hole provided in the header of the heat exchanger and
A pipe in the header having a tip having a constant outer diameter to be inserted into the pipe insertion hole,
A welded portion that welds the tip of the pipe in the header to the header, and
A cover member attached to the outer surface of the header and covering the tip of the pipe inside the header.
A hose mounting pipe provided on the cover member and having an enlarged diameter portion,
With
A pipe mounting structure for a heat exchanger, wherein the inner diameter of the pipe insertion hole has a size equal to or larger than the outer diameter of the tip end portion of the header inner pipe and less than the outer diameter of the enlarged diameter portion. The pipe mounting structure for a heat exchanger according to claim 1, wherein the tip of the pipe in the header and the hose mounting pipe are coaxially arranged. The pipe mounting structure of the heat exchanger according to claim 1 or 2 , wherein the heat exchanger is an intercooler for cooling the intake air of the engine. The pipe mounting structure of the heat exchanger according to claim 3 , wherein the header is an outlet header for discharging the cooled intake air. The pipe mounting structure for a heat exchanger according to claim 4 , wherein the pipe in the header is arranged in the outlet header and is configured to suck condensed water accumulated in the outlet header.

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