JP2002206887A - Pipe mounting structure of heat exchanger fitted with resinous fan shroud - Google Patents

Abstract

PROBLEM TO BE SOLVED: To materialize the rise of pressure resistance and the cost down of parts at large including a fan shroud, concerning a resinous pipe which is connected to the tank of a heat exchanger fitted with a resinous fan shroud. SOLUTION: The gate pipe 9 of a heat exchanger is made of resin material which has larger strength than that of the resin material of the fan shroud 6. Then, the fan shroud 6 is provided with a pipe through port 8, the end of the gate pipe 9 is passed through it, and the end is joined liquid-tightly with the gate 7 of a tank 4 through seal material 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for cooling an automobile engine, which has a resin fan shroud, and more particularly to a heat exchanger for a pipe protruding from a metal tank of the heat exchanger. Related to the mounting structure.

[0002]

2. Description of the Related Art In a heat exchanger for cooling an engine, a pair of tanks is arranged at both ends of a core comprising a large number of fins and tubes. A fan shroud usually made of resin is arranged facing the core, and its peripheral edge is fixed to a support material on the outer periphery of the tank or the core. Coolant water inlet / outlet pipes are respectively protruded from the pair of tanks, and one ends of the hoses are respectively connected to the pipes, and the other ends thereof communicate with a water jacket of the engine. If the tank of this heat exchanger is made of metal, the entrance is opened in the elongated box-shaped tank body, the end of the pipe is inserted there, and a claw is protruded at the tip of the pipe. Then, a small hole for nail locking is formed in the opposite surface of the entrance and exit of the tank, and the nail is inserted there. Then, the pipe is temporarily supported on the tank by caulking the claws, and the insertion portion between the pipe and the tank is fixed in a liquid-tight manner by brazing or soldering. Japanese Patent Application Laid-Open No. H11-287584 proposes a method in which a pipe is integrally provided with a resin shroud, and an end of the pipe is liquid-tightly joined to an inlet / outlet of a tank via a sealing material.

[0003]

The first method of inserting a metal pipe into the entrance and exit of a tank, caulking the end thereof, and brazing or soldering the penetration is fixed in the first method. There is a disadvantage that the number of steps is increased and the manufacturing cost is increased. In the case where the resin fan shroud and the inlet / outlet pipe are integrated, it is necessary to select a resin material having sufficient strength to withstand the internal pressure of the cooling water. Then, the entire fan shroud, which does not originally require much strength, uses the material, and there is a disadvantage that the material cost increases. In addition, if the inlet and outlet pipes are formed with a normal fan shroud material, the pressure resistance of the pipes of the tank is reduced, and there is a disadvantage that reliability is lacking. Therefore, an object of the present invention is to provide a pipe mounting structure of a heat exchanger with a resin fan shroud that can be easily mounted without lowering the pressure resistance of the tank and that can reduce the material cost.

[0004]

According to the present invention, a core comprising a plurality of fins (1) and a tube (2) is provided.
Heat exchanger (5) with metal tank (4) at the end of (3)
And a resin fan shroud (6) that faces the core (3) of the heat exchanger (5) and has a peripheral portion connected to the tank (4). And a pipe through-hole formed in the fan shroud (6) at a position matching the entrance (7)
(8) and an inlet / outlet pipe formed of a resin material having a strength greater than that of the resin material of the fan shroud (6).
(9), wherein the end of the entrance / exit pipe (9) passes through a pipe through hole (8) of the fan shroud (6), and the end of the entrance / exit pipe (9) passes through the sealing material (10). Doorway (7)
1 is a pipe mounting structure of a heat exchanger with a resin fan shroud which is liquid-tightly joined to a heat exchanger.

According to a second aspect of the present invention, in the first aspect, the pipe through hole (8) of the fan shroud (6) is formed in a circular shape, and a part of the circular shape is provided for inserting a locking claw. A notch (12) is formed at the root end of the entrance / exit pipe (9), and a retaining claw (12) for retaining substantially aligned with the notch (11) is provided. At the tip position from the locking claw (12),
An annular groove is formed on the outer periphery of the entrance / exit pipe (9), an O-ring (13) for sealing is fitted in the annular groove, and the locking claw (12) of the entrance / exit pipe (9) is inserted into the notch. (11) and insert the end of the pipe through the fan shroud (6).
(8) and moved around its axis, and the fan shroud (6) is connected to the heat exchanger (5), so that the O-ring (13) of the inlet / outlet pipe (9) fits in the tank (4). ) Is a pipe mounting structure of a heat exchanger with a resin fan shroud which is configured to be pressed against an opening edge of the entrance (7) or an inner peripheral surface of the opening.

According to a third aspect of the present invention, in the second aspect, a stopper portion (14) is integrally provided in a flange shape at a rear end side of the entrance / exit pipe (9) from the locking claw (12). The distance between the locking claw (12) and the stopper (14) is
(6) A pipe mounting structure for a heat exchanger with a resin fan shroud formed to match the thickness of the pipe through hole (8) of (6). According to a fourth aspect of the present invention, there is provided the fan shroud according to any one of the first to third aspects.
At or near the hole edge of the pipe through hole (8), the heat shroud (6) and the tank (4) of the heat exchanger with a resin fan shroud fastened and fixed in the thickness direction by fasteners It is a pipe mounting structure.

[0007]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of a pipe mounting structure of a heat exchanger with a resin fan shroud of the present invention. 2A and 2B are cross-sectional views of a main part showing the attached state, in which FIG. 2A is an overall cross-sectional view, FIG. It is a longitudinal cross-sectional view in the -C line. In this example, a pair of tanks 4 are vertically separated from each other, and a core 3 in which a number of fins 1 and tubes 2 are arranged in parallel is disposed therebetween. Then, both ends of each tube 2 communicate with the pair of tanks 4 in a liquid-tight manner. A cooling water inlet / outlet 7 is opened on the side surface of each tank 4 (the lower side is not shown).
There is brazing fixed. A pair of cap nuts 17 is fixed to the tank 4 by brazing outside the flange fitting 15. The opening of the cap nut 17 is exposed to the outer surface of the tank 4. The flange fitting 15 is formed of a short pipe with a flange, and is fixed to the tank 4 by liquid-tight brazing at the flange portion. Similarly, the cap nut portion 17 is fixed to the tank 4 in a liquid-tight manner at its flange portion by brazing.

Next, the fan shroud 6 is made of a synthetic resin injection-molded body, has a large-diameter opening at the center, and a small cylindrical portion is integrally formed with the opening, and the opening is formed through a stay (not shown). A motor support is provided at the center, and a fan drive motor is attached to the motor support. Then, a boss (not shown) of the fan 19 is fastened and fixed to the motor rotation shaft. The outer periphery of the fan shroud 6 is large enough to fit the core 3, and a pipe seat 22 is integrally protruded near a position matching the entrance 7 of the tank 4.
And a pair of cutouts 11 are provided at both ends in the diametrical direction. In addition, at least a pair of screw holes 20 are provided in the pipe seat 22 in the vicinity of the pipe through opening 8. As a material of the fan shroud 6, for example, a mixture of polypropylene and glass fiber can be used.
This is a material widely used as the well-known fan shroud 6.

Next, the inlet / outlet pipe 9 is injection-molded with a synthetic resin molding material having a high strength separate from the fan shroud 6. As an example, the resin material is PA
66 is obtained by mixing glass fibers. The entrance / exit pipe 9 is provided with a pair of arc-shaped stopper portions 14 at its root portion, and a locking claw 12 is integrally formed between the pair of stopper portions 14 on the axial end side. Note that the axial distance between the locking claw 12 and the stopper portion 14 substantially matches the thickness of the fan shroud 6 at the pipe opening 8. Also, the outer diameter of the entrance / exit pipe 9 matches the inner diameter of the pipe through-hole 8. An annular groove is formed in the end face of the entrance / exit pipe 9, and a rubber O-ring 13 as a sealing material 10 is fitted therein.

The pair of locking claws 12 of the entrance / exit pipe 9 thus formed are aligned with the notch 11 of the fan shroud 6, and the end of the entrance / exit pipe 9 is inserted into the pipe through hole 8. Then, by rotating the entrance / exit pipe 9 by 90 °, the inner surface side and the outer surface side of the pipe through-hole 8 are sandwiched between the locking claw 12 and the stopper portion 14. In such a state, the pipe penetration 8
The screw holes 20 existing on both sides of the fan shroud 6 are aligned with the cap nut 17, and the pipe seat 22 of the fan shroud 6 is fastened and fixed to the cap nut 17 of the tank 4 via the plurality of screws 16. Then, as shown in FIGS. 2A to 2C, the O-ring 13 is pressed against the flange surface of the flange fitting 15, and the pipe 9 and the tank 4 are pressed.
Is formed.

Next, FIG. 3 shows that O
Instead of fitting the ring, a rubber O-ring 13 as a sealing material 10 is fitted on the outer periphery of the distal end portion of the entrance / exit pipe 9, and a liquid-tight press-contact between the O-ring 13 and the inner peripheral surface of the flange fitting 15. It is.

FIG. 4 is an exploded perspective view of a principal part showing still another embodiment of the present invention. In this example, a flange-like stopper portion 14 is integrally provided on the entrance / exit pipe 9, and the stopper portion is provided. 14 has a pair of screw holes 20 formed therein. The pipe seat portion 22 of the fan shroud 6 has a pipe through hole 8 aligned with the outer periphery of the entrance / exit pipe 9 and a screw hole 20.
And a pair of engagement portions 18 having an inverted L-shaped cross section that are aligned with the outer periphery of the stopper portion 14 in the longitudinal direction. Then, the tip of the entrance / exit pipe 9 is inserted into the pipe through-hole 8, and the entrance / exit pipe 9 is turned by 90 °.
By rotating, the both edges of the stopper portion 14 are engaged with the engaging portions 18 so that the respective screw holes 20 are aligned. Then, the fan shroud 6 is brought into contact with the tank 4 as shown in FIG. .

[0013]

According to the first aspect of the present invention, the inlet / outlet pipe 9 is formed of a resin material having a strength greater than that of the resin material of the fan shroud 6, and the end of the fan shroud 6 is formed. And is liquid-tightly joined to the inlet / outlet 7 of the tank 4 via the sealing material 10. Therefore, only the inlet / outlet pipe 9 having a small amount of resin material necessary for molding is formed of a strong material to improve durability, and at the same time, to reduce the cost of the entire resin material and to improve the economical efficiency with the resin fan shroud. An exchange pipe mounting structure can be provided.

According to the present invention, the end of the inlet / outlet pipe 9 is connected to the pipe through-hole 8 of the fan shroud 6.
And the end thereof is liquid-tightly pressed against the inlet / outlet 7 of the tank 4 via the O-ring 13 in a state of being moved around the axis line while passing through. Therefore, it is possible to provide a pipe mounting structure for a heat exchanger with a resin fan shroud that has a simple structure and good mounting properties. According to the third aspect of the present invention, the gap between the locking claw 12 of the inlet / outlet pipe 9 and the flange-shaped stopper portion 14 is formed so as to match the thickness of the pipe through-hole 8 of the fan shroud 6. Therefore, the entrance / exit pipe 9 can be reliably and easily supported by inserting the entrance / exit pipe 9 into the pipe through-opening 8 and rotating about its axis. According to the invention described in claim 4,
At or near the hole edge of the pipe through hole 8 of the fan shroud 6, the fan shroud 6 and the tank 4 are fastened and fixed in the thickness direction by fasteners. It can be securely fixed to the entrance of the tank in a liquid-tight manner.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a pipe mounting structure of a heat exchanger with a resin fan shroud according to a first embodiment of the present invention.

2 (A) is a longitudinal sectional view, FIG. 2 (B) is a view taken along the line BB of FIG. 2 (A), and FIG. 2 (C) is a line CC of FIG. 2 (B). Longitudinal section.

FIG. 3 is a longitudinal sectional view of a pipe mounting structure of a heat exchanger with a resin fan shroud according to a second embodiment of the present invention.

FIG. 4 is an exploded perspective view showing a main part of a pipe mounting structure of a heat exchanger with a resin fan shroud according to a third embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of the mounting state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fin 2 Tube 3 Core 4 Tank 5 Heat exchanger 6 Fan shroud 7 Entrance / exit 8 Pipe penetration 9 Entrance / exit pipe 10 Seal material 11 Notch 12 Engagement claw 13 O-ring 14 Stopper 15 Flange fitting 16 Screw 17 Bag nut 18 Engagement part 19 Fan 20 Screw hole 21 Washer 22 Pipe seat

Claims (4)

[Claims] 1. A heat exchanger (5) having a metal tank (4) at an end of a core (3) comprising a number of fins (1) and tubes (2), and the heat exchanger (5). And a resin fan shroud (6) whose peripheral edge is connected to the tank (4) and which has an inlet / outlet (7) opened to the tank (4). , A fan shroud (6) at a position matching its entrance (7)
A pipe through-hole (8) formed in the fan shroud (6), and an inlet / outlet pipe (9) formed of a resin material having a strength greater than that of the resin material of the fan shroud (6). The end of the fan shroud (6) penetrates the pipe through hole (8), and the end of the resin is liquid-tightly joined to the entrance (7) via a sealing material (10). Pipe mounting structure for heat exchanger with fan shroud made of steel. 2. The fan shroud (6) according to claim 1, wherein the pipe through hole (8) of the fan shroud (6) is formed in a circular shape, and a cutout (11) for inserting a locking claw is formed in a part of the circular shape. A locking claw (12) is formed at the base end of the entrance / exit pipe (9), which is substantially aligned with the notch (11). In this position, an annular groove is formed on the outer periphery of the entrance / exit pipe (9), an O-ring (13) for sealing is fitted in the annular groove, and the locking claw (12) of the entrance / exit pipe (9) is attached to the above-mentioned position. Notch (1
Insert the end into the pipe through hole (8) of the fan shroud (6), move it around its axis, and connect the fan shroud (6) to the heat exchanger (5). With the resin fan shroud, the O-ring (13) of the entrance / exit pipe (9) is pressed against the opening edge of the entrance / exit (7) of the tank (4) or the inner peripheral surface of the opening. Pipe mounting structure for heat exchanger. 3. The stopper (14) according to claim 2, wherein a stopper (14) is integrally formed in a flange shape on a rear end side of the locking pawl (12) of the entrance / exit pipe (9).
A pipe mounting structure for a heat exchanger with a resin fan shroud formed so that the distance between 2) and the stopper portion (14) matches the thickness of the pipe through hole (8) of the shroud (6). 4. The fan shroud (6) and the tank (4) according to claim 1, wherein the fan shroud (6) has a pipe through hole (8) at or near a hole edge thereof. ) Is a pipe mounting structure for a heat exchanger with a resin fan shroud, which is fastened and fixed in the thickness direction by a fastener.