JPS6234070Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a sleeve-type welding blind device for quickly and reliably closing the end of a gas-cut pipe during gas pipe cutting and connection work. .

[Prior Art] Generally, gas pipes are constantly cut and connected due to route changes, etc. In such cases, it is necessary to reliably close the ends of the cut gas pipes.

Conventionally, as shown in FIG.
is inserted inside the gas conduit 21 and the gas outflow is blocked by expanding this sphere, and then the blind plate 2
The gas pipe 23 and the gas conduit 21 which are closed with the push ring 2 are connected to the push ring 2 through the dresser 24 and the rubber ring 25
6 and bolt nut 27, and the dresser 2
4. A method is used in which the press ring 26 and the like are completely covered with a dresser cover 28.

[Problems to be solved by the invention] However, in this method, the welding length of the dresser cover is long and construction time is required, and the cutting length l of the existing pipe 30 is long, so the excavation area is large and the material cost is high. It is also disadvantageous in terms of its high price.

The present invention has been devised to solve the above-mentioned problems, and aims to provide a device that can completely close the end of a gas conduit with relatively simple operation.

[Means for Solving the Problems] Therefore, in the present invention, as shown in FIG. 2, a blind plate 14 is fixed to one end of the cylindrical metal body 1', and a A sleeve body 1 to which a tapered inner ring 6 is fixed, a push ring 4 fitted between the inner surface of the cylindrical metal body 1' and the outer surface of the pipe end of the gas conduit 21, and one end of the push ring 4. a sealing elastic ring 5 press-fitted between the tapered inner ring 6; a pressing means 9 for pressing the pressing ring 4 toward the blind plate 14 of the sleeve body 1;
9', 10, 10', and 10' are provided.

Note that the pressing means 9, 9', 1 shown in the drawings
0, 10', and 10' denote a half flange 9 set on the outer end of the push ring 4 and another flange 9 abutted on the outside of the blind plate 14, as in the case of the embodiment described later. ', a plurality of bolts 10 passed between these flanges 9, 9', and nuts 10', 10' that are tightened from both sides of the bolts 10, but in the present invention, such a bolt is not used. Without limitation, the push ring 4 is attached to the sleeve body 1 blind plate 14.
Any configuration may be used as long as it can be pressed to the side.

[Function] When closing the end of the gas conduit 21 with the above configuration,
A push ring 4 and a sealing elastic ring 5 are inserted into the outer peripheral surface of the gas conduit 21 from its end, and the cylindrical metal body 1' of the sleeve body 1 is attached to the end of the gas conduit 21. Next, pressing means 9, 9', 10, 1
By pressing the push ring 4 against the blind plate 14 side of the sleeve main body 1 with
The sealing elastic ring 5 interposed between the tapered inner ring 6 of the sleeve body 1 is compressed, and as a result, the sealing elastic ring 5
It becomes possible to maintain an airtight state between the outer surface of the metal body 1 and the inner surface of the cylindrical metal body 1'. When such a state is reached, the parts exposed in layers on the outside of the gas conduit 21 where there is a possibility of gas leakage, namely the outer end of the cylindrical metal body 1', the outer peripheral surface of the push ring 4, and the outside of the push ring 4 are removed. The end portions and the outer circumferential surface of the end of the gas conduit 21 are respectively fillet welded to completely close the end of the gas conduit 21.

[Embodiment] An embodiment of the present invention will be described below with reference to FIG. It consists of a blind plate 14 fixed by welding to one end of the plate. Inside this cylindrical metal body 1', an inner ring 6 whose one end is fixed by welding is provided.
The other end is tapered as shown in the figure in order to ensure airtightness of the rubber ring 5, which will be described later. Further, at the end of the gas conduit 13 to be closed, a push ring 4 is fitted between the inner surface of the cylindrical metal body 1' and the outer surface of the gas conduit 13, and one end of the push ring 4 and the taper A sealing elastic ring 5 made of rubber or the like is interposed between the inner ring 6 and the inner ring 6.

However, in the present invention, the push ring 4 described above is
Push in the direction of the elastic ring 5 to press the elastic ring 5 between it and the tapered inner ring 6, and then press the outer end of the cylindrical metal body 1', the outer peripheral surface of the push ring 4, and the outer end of the push ring 4. The outer peripheral surface of the conduit 13 is welded by fillet welds 2 and 3, respectively.
Although any means may be used to press the push ring 4 on-site, preferred means and the order of assembling the blind device of the present invention will be described below.

Gas pressure 0.1 before gas conduit is cut
After lowering the pressure to below Kg/cm ² and preventing the gas from flowing out using the balloon-like elastic sphere 20 (see FIG. 2), the gas conduit is cut at the planned cutting point.

After fitting the push ring 4 and elastic ring 5 to the end of the cut gas conduit 13, the sleeve body 1 is fitted to the outside of the push ring 4.

A half flange 9 is set on the outer end of the push ring 4 (integrated by fitting it into the gas conduit 21 from above and below), and another flange 9' is set on the outside of the blind plate 14.
At the same time, a plurality of through bolts 10 are passed between these flanges 9 and 9', and nuts 1 on both sides are
Tighten at 0' and 10'. As a result, the distance between the flanges 9 and 9' is reduced, and the push ring 4 moves inward into the sleeve body 1, pressing the elastic ring 5 and connecting the outer surface of the gas conduit 21 and the inner surface of the cylindrical metal body 1'. An airtight state between the two can be obtained.

The balloon-shaped elastic sphere 20 is removed, the air between the balloon-shaped elastic body 20 and the blind plate 14 and in the pipe is purged through the purge hole, and the plug is fixed.

Next, temporary welding 2', 3' is performed on the outer end of the sleeve body 1, the outer peripheral surface of the push ring 4, and the outer peripheral surfaces of the push ring 4 and the gas conduit 13, respectively. A plurality of openings 7 are formed in the inner diameter direction of the half flange 9', and the temporary welding is performed through these openings 7.

Remove the through bolt 10 and remove both flanges 9,
9' (with flange 9 separated vertically)
After removing the temporary welds 2' and 3', the temporary welds 2' and 3' are finally welded to complete the work.

Note that the reference numeral 11 in the figure is a detection hole for checking the airtight state of the sealing elastic ring 5.

[Effects of the invention] According to the invention as explained above, if the sleeve body 1 etc. is manufactured in advance at the factory, it can be attached to the end of the pipe with extremely simple work on site. In addition to making it possible to reliably close the ends, the cut length of the existing pipe can be shortened, and the excavation area is small, which can shorten construction time and reduce construction costs. It provides excellent effects.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional side view showing the implementation status of a conventional dresser type blind device, Fig. 2 is a partially sectional side view showing the device of the present invention, and Fig. 3 shows an embodiment of the present invention. FIG. In the figure, 1 is the sleeve body, 1' is a cylindrical metal body,
2 and 3 are welded parts, 2' and 3' are temporary welded parts, 4 is a push ring, 5 is an elastic ring, 6 is a tapered inner ring, 7 is an opening, 9 is a half flange, 9' is a flange, 10 is a through bolt, 10' is a tightening nut, 11 is a detection hole, 13 is a gas conduit, and 14 is a blind plate.

Claims (1)

[Scope of utility model registration request] A sleeve body having a blind plate fixed to one end of the cylindrical metal body and a tapered inner ring fixed to the inside of the cylindrical metal body, and a sleeve body that is fitted between the inner surface of the cylindrical metal body and the outer surface of the pipe end of the gas conduit. the sleeve body; a sealing elastic ring press-fitted between one end of the press ring and the tapered inner ring; and a pressing means for pressing the press ring toward the blind plate side of the sleeve main body. A sleeve-type welding blind device for gas pipes featuring: