JPH08178580A - Inlet/outlet pipe of heat exchanger - Google Patents

Abstract

PURPOSE: To reduce the manufacturing cost by separately working a flange to be abutted on a vehicle body panel and a water hose to be connected thereto taking into consideration the safety of an inlet/outlet pipe. CONSTITUTION: An inlet/outlet pipe 1 consists of an aluminum inlet/outlet pipe body 1a and a resin pipe 15. The resin pipe 15 is provided with a positioning part 20a on which the tip of a water hose 2 is abutted when the resin pipe is inserted in the water hose 2, and a projecting part 20b for preventing drop-off. A flange 19 to be abutted on the edge of a hole 4 of a vehicle body panel 3 is formed on the periphery of an opening of the resin pipe 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger used in, for example, a vehicle air conditioner, for example, an inlet / outlet pipe of a heater core.

[0002]

2. Description of the Related Art As a conventional inlet / outlet pipe structure attached to a heater core, a heater core pipe shown in FIG. 2 of Japanese Utility Model Laid-Open No. 1-167908 is known.

The heater core pipe 5 disclosed in such publication.
The screw hole 17 of the heater core pipe 5 and the screw hole 15a of the flange portion 15 are screwed together with the screw 16 so that the heater core pipe 5 can be attached to the hot water circulation port 3 formed in the tank 2 of the heater core 1.

However, since the material of the heater core pipe 5 is not particularly limited, it can be considered to reduce the manufacturing cost by making the entire material of the heater core pipe 5 synthetic resin.

[0005]

However, since the heater core is usually disposed inside the center of the instrument panel, the heater core pipe is generally located near the toes of the person sitting in the passenger seat in the case of a right-hand drive vehicle. Will pass through. For this reason, when a resin is used for the heater core pipe, the pipe may be deteriorated and cracked, and hot water having a high heat may be applied to the foot to cause burns.

Therefore, the heater core pipe itself must be made of metal such as aluminum, and it is necessary to reduce the manufacturing cost.

As a result, as shown in FIG. 5, the conventional inlet / outlet pipe 1 made of aluminum has a projection 30 for preventing slipping off at the tip thereof for connection with the water hose 2.
The projection 31 for insertion positioning is formed by bulging, and the flange 32 is externally attached and fixed by brazing in order to contact the edge of the hole 4 of the vehicle body panel 3 and close the hole 4.

Therefore, the flange 32 is attached to the inlet / outlet pipe 1.
However, there is a problem in that the manufacturing cost of the inlet / outlet pipe 1 is high because a step of brazing and forming the protrusions 30 and 31 on the tip of the inlet / outlet pipe 1 by bulging is required.

In view of the above problems, the present invention has been made in view of the above problems.
The entrance and exit of the heat exchanger that reduces the manufacturing cost by using aluminum inlet and outlet pipes while considering safety, and dividing the processing for connecting the flange that contacts the vehicle body panel and the water hose into separate members Intended to provide pipes.

[0010]

The inlet / outlet pipe of the heat exchanger comprises a metal inlet / outlet pipe body attached to the heat exchanger and a resin pipe fitted to the inlet / outlet pipe body. The resin pipe is formed with a flange and a retaining portion (claim 1).

The retaining portion is composed of a positioning portion and a protrusion (claim 2).

The inner diameter of the resin pipe is equal to the outer diameter of the inlet / outlet pipe body, and its tip is smaller than the outer diameter of the inlet / outlet pipe body (claim 3).

[0013]

Therefore, the inlet / outlet pipe is constructed by externally fitting the resin pipe having the flange and the retaining portion to the metal inlet / outlet pipe body attached to the heat exchanger, and the flange comes into contact with the vehicle body panel. , The water hose is connected at the retaining part. Then, the insertion amount of the water hose is determined by the positioning portion of the retaining portion, and the protrusion is firmly connected. Further, since the inner diameter of the tip of the resin pipe is formed smaller than the outer diameter of the inlet / outlet pipe, the insertion amount of the resin pipe is always constant.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3, a heater core 10 constituting a heating system for a vehicle air conditioner according to the present invention.
An example is shown for the aspect in which the inlet / outlet pipe 1 and the water hose 2 are connected.

Among them, the heater core 10 is arranged in the air conditioning duct 11 as shown in FIG.
For heating the air passing through the inside of 0, the whole structure is not shown in detail, but for example, tube elements and corrugated fins forming a passage of a heat exchange medium are alternately laminated, and one end of the laminated tube elements is formed. This is a known device in which a tank is connected to the side and a pair of inlet / outlet pipes 1 is attached to the tank.

The inlet / outlet pipe 1 is composed of an inlet / outlet pipe body 1a made of a metal material such as aluminum and a resin pipe 15 fitted on the inlet / outlet pipe body 1a. This entrance / exit pipe 1 is led out from the air conditioning duct 11 to the vehicle interior 12 side, and further, a hole 4 formed in the vehicle body panel 3
It has a length that passes through the inside to reach the inside of the engine room 13.

The inlet / outlet pipe body 1a is attached at its base end side to the inlet / outlet hole of the tank of the heater core 10 by furnace brazing or the like. The inlet / outlet pipe body 1a is a circular pipe having the same diameter and has a desired length, as shown in FIGS.

The resin pipe 15 is made of nylon resin, for example.
A tubular body made of carbon resin or epoxy resin, having openings 16 and 17 at both ends, a relatively wide flange 21 at one end, and a retaining portion 20 described below on the outer peripheral side at the other end side. ing. The inner diameter dimension II of the resin pipe 15 is the same as the outer diameter dimension I of the inlet / outlet pipe body 1a. Further, the dimension III of the opening 17 on the tip side of the resin pipe 15 is smaller than the dimension I of the outer diameter of the inlet / outlet pipe body 1a because the step portion 22 is provided at the tip of the resin pipe 15.

The retaining portion 20 is a positioning portion 20a for inserting and positioning the water hose 2 fitted on the resin pipe 15, and a retaining portion of the water hose 2 on the tip side of the positioning portion 20a. And the protrusions 20b are formed in an annular shape.

The resin pipe 15 having such a structure is externally fitted to the inlet / outlet pipe body 1a, and is inserted until the tip of the inlet / outlet pipe body 1a comes into contact with the step portion 22 of the resin pipe 15. At this time, since the adhesive made of resin or the like is applied to the outer circumference of the inlet / outlet pipe body 1a in advance, the inlet / outlet pipe body 1a and the resin pipe 15 are firmly adhered after the insertion. Thereby, the inlet / outlet pipe 1 with the flange 19 is configured.

The heater core 10 having the inlet / outlet pipe 1 having such a structure is attached to the vehicle by mounting the pair of inlet / outlet pipes 1 projecting from the air conditioning duct 11 from the passenger compartment 12 side through the hole 4 of the vehicle body panel 3 in the engine room. 13 to project. Since the heat-insulating sealing material 23 is fitted on the inlet / outlet pipe 1 in advance during the insertion, it is interposed between the flange 19 and the vehicle body panel 3, and the hole 4 is sealed. Although not shown, the air conditioning duct 11 is fixed to the vehicle body.

Then, the water hose 2 is externally inserted into the inlet / outlet pipe 1 on the engine room 13 side. The insertion is performed until the tip of the inlet / outlet pipe 1 crosses the protrusion 20b and comes into contact with the positioning portion 20a. When the tip of the inlet / outlet pipe 1 comes into contact with the positioning portion 20a, the clamp 25 shown in FIG. 4 is attached from above the water hose 2 and the water hose 2 is tightened to prevent the water hose 2 from coming off. The clamp 25 used here is
It is not limited to the one shown in FIG. 4, and a known one can be used.

However, according to the above construction, since the inlet / outlet pipe main body 1 of the inlet / outlet pipe 1 is made of aluminum, it does not deteriorate and break, and high-temperature cooling water leaks, possibly causing burns to passengers. There is no In addition, at the tip of the inlet / outlet pipe 1, the resin pipe 15 is connected to the inlet / outlet pipe body 1a.
Since it only needs to be adhered to, it does not need to be processed for engaging the vehicle body panel 3 and connecting with the water hose 2. The flange 19 and the retaining portion 20 can be easily integrally formed in the resin pipe 15 in the manufacturing process thereof, and the manufacturing cost thereof is extremely high as compared with the conventional case where the flange is mounted on the relay pipe by brazing. It can be kept low.

[0025]

As described above, according to the inlet / outlet pipe of the heat exchanger according to the present invention, the inlet / outlet pipe does not need to be formed with a retaining portion in order to connect with the water hose.
Further, since it is not necessary to braze the flange to engage with the edge of the hole of the vehicle body panel, the manufacturing cost of the entrance / exit pipe can be reduced.

Further, according to the inlet / outlet pipe of the heat exchanger according to the present invention, since the inlet / outlet pipe body is made of metal such as aluminum, there is a possibility that it deteriorates and high-temperature cooling water leaks to cause burns to passengers. There is no

[Brief description of drawings]

FIG. 1 is an explanatory view showing a state in which a resin pipe is externally inserted into an inlet / outlet pipe body of a heat exchanger.

FIG. 2 is a cross-sectional view showing a state in which the inlet / outlet pipe main body and the resin pipe are mounted on the same.

FIG. 3 is a cross-sectional view showing a state in which a water hose is attached to the inlet / outlet pipe of the above.

FIG. 4 is an explanatory view showing a clamp for fixing a water hose to an inlet / outlet pipe.

FIG. 5 is a cross-sectional view showing a state in which a conventional inlet / outlet pipe and a water hose are attached.

[Explanation of symbols]

 1 Inlet / outlet pipe 1a Inlet / outlet pipe main body 2 Water hose 3 Body panel 4 Hole 10 Heater core 15 Resin pipe 19 Flange 20 Fall prevention part 20a Positioning part 20b Projection part 22 Step part

Claims (3)

[Claims] 1. A metal inlet / outlet pipe body attached to a heat exchanger, and a resin pipe fitted to the inlet / outlet pipe body, wherein the resin pipe has a flange and a retaining portion. The inlet / outlet pipe of the heat exchanger, which is characterized in that 2. The inlet / outlet pipe of the heat exchanger according to claim 1, wherein the retaining portion includes a positioning portion and a protrusion. 3. The heat exchange according to claim 1, wherein an inner diameter of the resin pipe is equal to an outer diameter of the inlet / outlet pipe body, and a tip of the resin pipe is smaller than an outer diameter of the inlet / outlet pipe body. Entrance and exit pipe of the container.