JP2000213890A - Sealing plug for pipe end of heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contrive to seal a pipe-inserting hole completely without any risk to damage the pipe-inserting hole. SOLUTION: The pipe end-sealing plug for a heat exchanger comprises a sealing plug 2 consisting of an elastic body and having a penetrating-through hole 3 in the center of the sealing plug 2 and a screw shaft 4 having a tapered cone and a screw shaft 9 consisting of the end of a decreased diameter part of the screw shaft 4, wherein the screw shaft 4 having the tapered cone is inserted into the penetrating-through hole 3 of the sealing plug 2 and forms a taper 8 from a larger diameter part 6 with an outside diameter larger than an inside diameter of the penetrating-through hole 3 of the sealing plug 2 and equal to or smaller than an inside diameter of a pipe or pipe-inserting hole 7 and decreases the outside diameter to that equal to or smaller than the inside diameter of the penetrating-through hole 3 of the sealing plug 2 and has the screw shaft 9 consisting of the end of the decreased diameter part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe end sealing plug for sealing a pipe end or a pipe insertion hole of a heat exchanger,
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe end plug for a heat exchanger, which can reliably seal a tube insertion hole of a tube sheet, which has been difficult in the past.

[0002]

2. Description of the Related Art As shown in FIG. 3, a general heat exchanger comprises a heat medium passage 32 inside a sleeve 31 and a fluid passage 33 for absorbing heat (cold heat) from the heat medium. A number of tubes 34 are inserted into the tube insertion holes 36 of the tube plate 35 to form the heat medium passages 32 in the sleeve 31.

[0003] The above-mentioned tube may become thinner due to long-term operation, or a pinhole may be formed for some reason. As a first-aid measure, a sealed plug is attached to a damaged tube end, or a spare tube is inserted. Insert a spare tube into the hole.

A sealing plug is fitted into the spare tube insertion hole. When emergency treatment is required, the sealing plug is removed, and a spare tube is inserted into the tube insertion hole and fixed by welding or the like. I have to.

[0005] Further, in order to confirm whether or not the strength of the tubes of the heat exchanger is maintained, a pressure resistance test is performed with a sealing plug provided at the end of the tubes.

[0006] As a sealing plug for sealing the pipe end or the pipe insertion hole (hereinafter simply referred to as the pipe end), a tapered cone 42 is driven into the pipe end 41 with a hammer or the like as shown in FIG. There is something to do. Further, as shown in FIG. 5, a screw shaft having a through hole 52 at the center at the tube end 51 and a disk 55 in one of the through holes of a sealing plug 54 made of an elastic body having a tapered shape 53. 56 and the sealing stopper 5
In some cases, the tube end 51 is sealed by applying a pressing member 57 to a screw shaft 56 protruding from the nut 4 and tightening it with a nut 58.

[0007]

In the above-mentioned prior art, the former sealing plug has a risk of falling off, so that there is no reliability in the sealing. The hole may be damaged. In addition, the latter sealing stopper is suitable for sealing the pipe end, but when the pressure of the heating medium is high, there is a risk that it will come off, so that a sufficiently reliable sealing cannot be expected. In particular, it is not suitable for sealing a spare tube insertion hole through which a tube is not inserted.

The present invention has been made in view of the above-mentioned problems of the prior art,
An object of the present invention is to provide a sealing plug capable of completely sealing a tube insertion hole without fear of damaging the tube insertion hole.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a sealing plug having a through hole at the center made of an elastic body, and the sealing plug inserted into the through hole of the sealing plug. While forming a taper from the end of the outer diameter that is larger than the inner diameter of the through hole of the pipe or the pipe insertion hole and is smaller than the inner diameter of the through hole of the sealing plug, the diameter is reduced to the outer diameter that is equal to or less than the inner diameter of the through hole of the sealing plug. The screw shaft is provided with a tapered cone on the outer periphery.

[0010] With the above construction, there is no need to hammer the tapered cone into the tapered cone, and there is no need to worry about damaging the tube insertion hole. Biting can be completely sealed.

[0011]

Embodiments of the present invention will now be described with reference to the drawings. As shown in FIG. 1A, in a tube end sealing plug 1, a screw shaft 4 with a tapered cone is inserted into a through hole 3 provided at the center of a sealing plug 2 made of an elastic body.

The screw shaft 4 with a tapered cone has an outer diameter of the large diameter portion 6 of the tapered cone 5 smaller than the inner diameter of the tube insertion hole 7 and forms a taper 8 from that portion while forming the taper 8. The diameter of the through hole 3 is reduced to an outer diameter equal to or less than the inner diameter, and the end of the reduced diameter portion becomes a screw shaft 9.
The nut 11 is screwed into the nut.

[0013] As shown in FIG.
As shown in FIG. 1 (b), a screwdriver blade (not shown) is inserted into the groove 12 of the screw end, and the nut 11 is tightened so as not to co-rotate. 2, the sealing plug 2 bites into the tube insertion hole 7 and is completely sealed.

When the tube end 14 is sealed by the tube end sealing plug 1 of the above embodiment, as shown in FIG. Insert another tapered cone 5 'with
Into the pipe end 14 and the nut 1 through the washer 10.
1, the sealing stopper 2 is connected to both the tapered cones 5,
The diameter is increased from both sides by 5 'to seal the tube end 14.

When the tube end is sealed as described above, the diameter increases at both ends of the sealing plug and comes into close contact with the inner surface of the tube. There is no problem that the sealing plug falls off when a large pressure acts from one side as in the conventional example shown in FIGS. 4 and 5.

[0016]

As described above, according to the present invention, the operation of hitting the tapered cone with a hammer is eliminated, so that the pipe insertion hole is not damaged. , And a highly reliable seal can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an embodiment of the present invention, wherein (a) is a state before sealing, and (b) is a state after sealing.

FIG. 2 is a sectional view showing a state in which an embodiment of the present invention is applied to sealing of a pipe end;

FIG. 3 is a sectional view of a heat exchanger.

FIG. 4 is a cross-sectional view of a conventional pipe end sealing plug.

5A and 5B are cross-sectional views of another conventional pipe end sealing plug, in which FIG. 5A shows a state before sealing and FIG. 5B shows a state after sealing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe end sealing plug 2 Sealing plug 3 Through hole 4 Screw shaft with taper cone 5, 5 'Taper cone 6 Large diameter part 7 Pipe insertion hole 8 Taper 9 Screw shaft 10 Washer 11 Nut 12 Groove 13 Annular groove 14 Pipe end 15 Through-hole (of taper cone)

Claims (1)

[Claims] A sealing plug having a through hole at the center made of an elastic body, inserted into the through hole of the sealing plug, larger than the inner diameter of the through hole of the sealing plug, and the inner diameter of a tube or a tube insertion hole. A heat formed by a tapered cone-shaped screw shaft having a diameter smaller than or equal to the inner diameter of the through hole of the sealing plug while forming a taper from the end having the following outer diameter, and a screw provided on the reduced diameter outer periphery. Tube end stopper for the exchanger.