JPH07318294A - Repairing method for heat exchanger and heat exchanger repairing plug - Google Patents

Abstract

PURPOSE:To rapidly, effectively repair a heat exchanger in which a tube is damaged in a method for repairing the exchanger to repair the exchanger in which the tube is damaged and a heat exchanger repairing plug. CONSTITUTION:A method for repairing a heat exchanger to repair the exchanger in which a tube 35 inserted fixedly to a tube insertion hole 33 formed at a seat plate 31 is damaged comprises the steps of inserting a plug 37 having elasticity at a position corresponding to the hole 33 of the tube 35, and so forming it as to fix it in a compressed state. A heat exchanger repairing plug comprises a plug body 39 formed with a hole 39b at its center and having elasticity, and a pin member 41 inserted into the hole 39b of the body 39 to increase in diameter the hole 39b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger repair method and a heat exchanger repair plug for repairing a heat exchanger having a broken tube.

[0002]

2. Description of the Related Art Conventionally, as a heat exchanger such as a radiator,
For example, the one disclosed in Japanese Utility Model Laid-Open No. 63-134282 is known.

FIG. 7 shows a heat exchanger of this type.
In this heat exchanger, a hakama portion 15 protruding outward from the tank 11 is formed along the opening 13 of the tank 11. The opening 13 and the hakama 15 are covered by the seat plate 17, and the caulking part 19 on the outer periphery of the seat plate 17 is fixed to the back surface of the hakama 15.

An annular packing 23 is housed in a recess 21 formed along the peripheral edge of the seat plate 17. A tube insertion hole 25 is formed in the seat plate 17, and a tube 27 is inserted into the tube insertion hole 25 and fixed by brazing or the like.

Conventionally, in such a heat exchanger, when the tube 27 is broken, the repair is performed by the broken portion 29.
This is done by sealing the product by soldering or brazing.

[0006]

However, in such a conventional heat exchanger repairing method, if the size of the fractured portion 29 becomes large, it becomes difficult to reliably seal by soldering, brazing, or the like. Further, when the tube 27 is made of aluminum, the tube 27 is formed of a very thin plate material, so that the broken portion is generally large and the deformation thereof is large, which makes repairing by brazing or the like difficult. was there.

The present invention has been made in order to solve the above-mentioned conventional problems, and a method for repairing a heat exchanger and a heat exchanger repair plug capable of repairing a heat exchanger having a broken tube quickly and reliably. The purpose is to provide.

[0008]

A method of repairing a heat exchanger according to the present invention is directed to a heat exchanger for repairing a heat exchanger having a broken tube inserted and fixed in a tube insertion hole formed in a seat plate. In the repair method, an elastic plug is inserted in a position corresponding to the tube insertion hole in the tube and fixed in a compressed state.

The heat exchanger repair plug of the present invention comprises a plug main body having a hole formed at the center and having elasticity, and a pin member which is inserted into the hole of the plug main body and expands the diameter of the hole. Is.

[0010]

In the heat exchanger repairing method of the present invention, the elastic plug is inserted into the tube at a position corresponding to the tube insertion hole and fixed in a compressed state. Since it is supported by the plate and has sufficient strength, the plug is less deformed by pressure and the elastic plug is firmly fixed in a compressed state.

In the heat exchanger repair plug of the present invention, first,
The plug body is inserted into the tube at a position corresponding to the tube insertion hole, and then the pin member is inserted into the hole portion of the plug body, whereby the hole portion is expanded and the plug body is fixed in a compressed state.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an embodiment of a heat exchanger repair method of the present invention. In the figure, reference numeral 31 denotes a seat plate made of, for example, aluminum.

A flat tube insertion hole 33 is formed in the seat plate 31. A flat tube 35 made of, for example, aluminum is inserted into the tube insertion hole 33.

The outer circumference of the tube 35 is brazed to the tube insertion hole 33. The elastic heat exchanger repair plug 37 is inserted into the tube 35 at a position corresponding to the tube insertion hole 33 and in the vicinity thereof, and is fixed in a compressed state.

The heat exchanger repair plug 37 is composed of a plug body 39 and a pin member 41. As shown in FIGS. 2 and 3, the plug body 39 has a curved surface portion 39a formed at the tip, and the shape and size of the cross section thereof are formed to be substantially the same as the inner peripheral shape of the tube 35.

At the center of the upper surface of the plug body 39, there is formed a hole portion 39b having an elliptical cross section which reaches the vicinity of the curved surface portion 39a. A flange portion 39c protruding outward is formed on the top of the plug body 39.

The plug body 39 is made of, for example, silicone resin, ethylene / propylene / diene monomer (EPD).
It is formed of a material having sufficient elasticity such as M). As shown in FIGS. 4 and 5, the pin member 41 is formed with a curved surface portion 41a at its tip and has a cross-sectional shape and size substantially the same as the inner peripheral shape of the hole portion 39b of the plug body 39. There is.

The plug body 39 is made of, for example, hard resin, metal or the like. In this embodiment, as shown in FIG. 3, the minor axis dimension of the hole 39b of the plug body 39 is a, and the minor axis dimension of the outer diameter of the plug body 39 is c,
In addition, as shown in FIG. 1, the seat plate 31 of the plug body 39 is
Assuming that the thickness in the minor axis direction at the position is d, the compression ratio D calculated by D = (c−a−2d) / (c−a) is 0.15 to 0.4.

The dimensions on the major axis side are set so as to have the same compression rate. The heat exchanger repair method using the heat exchanger repair plug described above is performed as described below.

That is, first, as shown in FIG. 1, the tank (not shown) is removed from the seat plate 31, and thereafter, the plug body 39 corresponds to the tube insertion hole 33 in the tube 35 from the back side of the seat plate 31. The flange portion 39c is inserted into the position and the vicinity thereof until it abuts on the end surface of the tube 35.

Then, after this, the hole 3 of the plug body 39
The pin member 41 is inserted into 9b by using a finger or a tool, whereby the diameter of the hole 39b is expanded, and the plug body 3
9 is fixed in a compressed state at the position of the tube insertion hole 33 of the seat plate 31.

In the above heat exchanger repair method, however, the elastic heat exchanger repair plug 37 is inserted into the tube 35 at a position corresponding to the tube insertion hole 33 and fixed in a compressed state. It is possible to quickly and reliably repair a heat exchanger that has broken.

That is, in the above heat exchanger repair method, the elastic heat exchanger repair plug 37 is inserted into the tube 35 at a position corresponding to the tube insertion hole 33 and fixed in a compressed state. Since the outer periphery of the tube insertion hole 33 is supported by the seat plate 31 and has sufficient strength, the heat exchanger repair plug 3
It is possible to firmly fix the heat exchanger repair plug 37 having a small elasticity due to the pressure of 7 in the compressed state, and as a result, the heat exchanger in which the tube 35 is broken without impairing the sealing property is used. It can be reliably repaired.

Further, since the repair can be performed simply by inserting the heat exchanger repair plug 37 into the tube 35, brazing,
The heat exchanger in which the tube 35 is broken can be quickly repaired without requiring special equipment or the like as in the case of repairing by welding or the like.

Further, it is possible to perform reliable sealing regardless of the size of the fractured portion, and even when the tube 35 is made of aluminum, it is possible to perform reliable sealing regardless of the strength of the tube 35. Become.

Then, the heat exchanger repair plug 37 described above.
Then, the plug body 39 is inserted into the tube 35 at a position corresponding to the tube insertion hole 33, and then the pin member 41 is inserted into the hole portion 39b of the plug body 39, whereby the hole portion 39b is expanded in diameter, Since the main body 39 is fixed in a compressed state, it is possible to quickly and surely repair the heat exchanger in which the tube 35 is broken.

Further, in the above-mentioned heat exchanger repair plug 37, since the compressibility D is set to 0.15 to 0.4, it is possible to reliably maintain the sealing property. That is, when the compression rate D is less than 0.15, it becomes difficult to obtain sufficient sealing properties, and when the compression rate D exceeds 0.4, the tube 35 may be damaged by the pressure. There is
In addition, the elasticity of the plug body 39 may decrease with time and the sealing performance may deteriorate.

FIG. 6 shows another embodiment of the heat exchanger repair method of the present invention. In this embodiment, first, the tube 35 is cut outside the seat plate 31, and then the seat plate is cut. The plug body 39 is inserted from the outside of 31 into the tube 35 at a position corresponding to the tube insertion hole 33 and in the vicinity thereof until the flange portion 39c comes into contact with the cut end surface of the tube 35.

Then, after this, the hole 3 of the plug body 39
The pin member 41 is inserted into 9b by using a finger or a tool, whereby the diameter of the hole 39b is expanded, and the plug body 3
9 is fixed in a compressed state at the position of the tube insertion hole 33 of the seat plate 31.

In this embodiment, almost the same effect as that of the above-mentioned embodiment can be obtained, but in this embodiment, the tube 35 is cut on the outside of the seat plate 31, and the plug body is cut from the outside of the seat plate 31. Since 39 is inserted into the tube 35, it is not necessary to remove a tank (not shown) from the seat plate 31, and the heat exchanger with the broken tube 35 can be repaired more quickly.

In the embodiment described above, the heat exchanger repair plug 3 is attached to the tube 35 fixed to the seat plate 31 on one side.
Although the example in which 7 is attached has been described, in a normal heat exchanger, since the seat plates 31 are arranged facing each other with a predetermined gap, except for the case where a break portion is formed in the immediate vicinity of the seat plate 31. The heat exchanger repair plugs 3 on both ends of the tube 35.
7 is attached.

In the heat exchanger repair method described above, the heat exchanger repair plug 37 including the plug body 39 and the pin member 41 is attached to the tube 35, but the present invention is not limited to this embodiment. However, for example, the plug body 39 is formed to have a size larger than the tube 35 without forming the hole portion 39b in the plug body 39, and the plug body 39 is attached to the tube 3
You may make it press-fit in 5.

[0033]

As described above, in the method for repairing a heat exchanger of the present invention, since the elastic plug is inserted into the tube at a position corresponding to the tube insertion hole and fixed in a compressed state, the tube is broken. The heat exchanger can be repaired quickly and surely.

Further, in the heat exchanger repair plug of the present invention,
The plug body is inserted into the tube at the position corresponding to the tube insertion hole, and then the pin member is inserted into the hole of the plug body, which expands the hole and fixes the plug body in the compressed state. The advantage is that a heat exchanger with a broken tube can be repaired quickly and reliably.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a heat exchanger repair method of the present invention.

2 is a perspective view showing a plug body of the heat exchanger repair plug of FIG. 1. FIG.

FIG. 3 is a sectional view taken along the line − in FIG.

4 is a perspective view showing a pin member of the heat exchanger repair plug of FIG. 1. FIG.

FIG. 5 is a sectional view taken along the line − in FIG.

FIG. 6 is a cross-sectional view showing another embodiment of the heat exchanger repairing method of the present invention.

FIG. 7 is an explanatory diagram showing a conventional heat exchanger repair method.

[Explanation of symbols]

 31 seat plate 33 tube insertion hole 35 tube 37 heat exchanger repair plug 39 plug body 39b hole 41 pin member

Claims (2)

[Claims] 1. A repair method for a heat exchanger for repairing a heat exchanger in which a tube (35) inserted and fixed in a tube insertion hole (33) formed in a seat plate (31) is broken, wherein (35) The tube insertion hole (3
A method for repairing a heat exchanger, characterized in that an elastic plug (37) is inserted at a position corresponding to 3) and fixed in a compressed state. 2. A plug main body (39) having a hole (39b) formed in the center and having elasticity, and a hole (39b) inserted into the hole (39b) of the plug main body (39) to expand the diameter of the hole (39b). And a pin member (41) for the heat exchanger repair plug.