JPH0448520Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a hydraulic test jig mainly used for pressure testing of welded steel pipes for power generation boilers. More specifically, this invention relates to a hydraulic test jig in which the opening of a pipe welded to a boiler is sealed at the bevel of the pipe.

As shown in the first diagram, the conventional water pressure test jig is a groove part 10 of a pipe 101 attached to a boiler 100.
2 and the groove part 104 of a blind cylinder 103 having the same diameter as this, and a cylindrical sealing material 1 is placed on the outer surface of this opposing surface.
05 in a straddling manner, and two-split rings 108 and 109 having grooves that match the protrusions 106 and 107 provided on the outer surfaces of the two cylinders, respectively, are inserted into the respective ears 110 of the bolts. 111 and a nut 112 to tighten the structure.

In the case of a jig with this structure, since the test pressure is high (100 to 400 Kg/cm ² ), there are problems with the accuracy of the roughness of the outer surfaces of both the pipe 101 and the blind tube 103 and the material selection of the sealing material. Moreover, when installing the jig, it is necessary to tighten the split rings 108 and 109 while maintaining the centering of the blind tube depending on the centering relationship of the blind tube 103 with respect to the pipe 101 and the orientation of the pipe 101 (vertical, horizontal, diagonal, etc.). There were problems such as the need for a large number of people to arrive. In particular, the biggest drawback is that when the seal material is crimped, the direction of the crimping is perpendicular to the axis of the pipe, which creates eccentric stress in the seal material, and in order to remove this stress, a specially shaped seal material and excessive tightening are required. This required strength.

This invention provides a new jig that eliminates the drawbacks of conventional hydraulic test jigs, and embodiments of this invention will be described below with reference to the accompanying drawings.

Figures 2 and 3 are exploded cross-sectional views of the main parts of the jig according to this invention, and the jig consists of two members: a main body indicated by reference numeral 1 in Fig. 2 and a holder 3 shown in Fig. 3. has been done.

The main body 1 shown in FIG. 2 is formed by a hollow cylindrical portion 11 and a half-cylindrical main body side holder 12 connected to the hollow cylindrical portion 11. In the hollow cylindrical portion 11, six through holes 16 are formed at equal angles in the upper half-cylindrical wall portion 15 excluding the main body side holder 12. Hollow cylindrical part 1
A plug 2 is screwed to the plug 1 through screws 13 and 21 provided on the respective connecting surfaces so that it can freely move forward and backward in the axial direction. and hollow cylindrical part 11
A hanging ring 14 is provided on the head. A plug 2 having a screw 21 on its circumferential surface is formed as a cylindrical body, and a nut 2 is attached to the outer center of the plug 2.
2 and a hanging ring 23 is provided on the top surface of this nut. Also, on the opposite side, an O-ring 24 is connected to a concave groove 25.
It is located inside. Although the set diameters of the O-ring and the groove are not shown, they are formed so as to come into contact with the grooved surface of the pipe to be sealed.

The main body side holder is provided with a function of integrally bonding to a predetermined position of the test pipe in cooperation with a holder 3 which will be described in detail later, and its structure will be explained as follows. This holding body 12 is formed as a semi-cylindrical shape, and has a semi-circular hollow part with a semi-cut groove 17 having approximately the same diameter as the outside diameter of the pipe and a size large enough to fit loosely into the protrusion of the pipe, which will be described in detail later. A half-cut groove 19 is formed in communication with the concave line 18 to allow free insertion of the cylindrical body of the plug 2 described above. In addition, there are through holes 1 near the top of both semi-cylindrical arc walls.
An ear portion 20 provided with 0 is formed.

The holder 3 shown in the third figure is formed as a semi-cylindrical shape 31, and this semi-circular hollow part has a semi-cut groove 17 formed in the semi-circular hollow part of the main body side holder, and a groove 1.
8 and a half-cut groove 32, a groove 33, and a half-cut groove 34 having approximately the same diameter and the same shape as the half-cut groove 19 on the cylindrical side are formed. Further, six screw holes 35 are formed in the semi-cylindrical wall portion 36 at positions facing the through holes 16 of the main body side holder described above. In the vicinity of the upper part of both semi-cylindrical arcuate walls, screw holes 37 are respectively located at positions opposite to the through holes 10 of the main body side holder.
A lug 38 is provided.

The manner of use of the jig of this invention, which is composed of the above-mentioned members, will be explained as follows with reference to FIGS. 4 and 5.

The pipe P whose base is welded to the boiler B has a protrusion 4 welded to a predetermined position on its outer surface, and the groove surface 41 has a high-precision surface finish with a predetermined angle. . The protrusion 4 is set at such a position that when the groove 18 of the main body 1 is loosely fitted into the protrusion 4, the tip of the groove of the pipe does not hit the hollow cylindrical portion. When attaching the jig of this invention to this pipe P, as shown in the fourth figure,
First, the concave strip 18 of the main body side holder 12 is loosely fitted to the protrusion 4, and then the concave strip 33 of another holder 3 is loosely fitted to the other side of the protrusion 4 at the opposing position of this holder 12. Ears 20 provided on both sides of both members,
38 through bolt 5. At the same time, the hollow cylindrical portion 11 of the main body 1 is
and the holder 3 are lightly set. In this state, as shown in Figure 5, the nut 22 of the plug 2 is rotated to advance the plug 2 to the extent that the O-ring 24 is sufficiently pressed against the groove surface 41 of the pipe. Thereafter, the bolts 5 and 6 are further tightened to ensure the sealing effect. Note that the reference numeral 7 in both figures is a spacer. The suspension rings 14 and 23 are used to suspend the main body 1 with a crane when it is attached to the pipe P.

The boiler water pressure testing jig of this invention has the following effects due to the above-mentioned configuration.

Commercially available O-rings can be used as sealing materials, and since the direction of the crimping matches the axial direction of the pipe, the crimping force on the O-rings is not only uniform, but also in the same direction as the thrust direction of the water pressure. Therefore, it has the characteristic that excessive pressing force is not applied to the plug. Furthermore, regarding the finishing accuracy of the grooved surface of the pipe, machining thereof can be carried out sufficiently and easily compared to finishing the outer surface of the pipe. In addition, when the two holding bodies 3 and 12 are combined and tightened, the cylindrical part 11 of the main body 1 and the holding body 3 are connected through the bolt 6, so that the pressure resistance in the test and the adaptability to the increase in pipe diameter are sufficient. This is something that can be met. In particular, since bending stress is not generated in the upper half of the cylindrical portion 11 of the main body 1 on the side opposite to the holder, separation between the upper half and the groove surface due to high pressure is completely prevented, and the sealing effect can be precisely maintained. .

Another embodiment of the jig of this invention is shown in FIG. 6, and in this embodiment, a hollow cylindrical portion 11 forming the main body 1 in the previous embodiment and a half-cylindrical main body side holder 12 are used. The hollow cylindrical part 11' and the semi-cylindrical holder 12' are integrally fixed with the required number of bolts 8 to produce the same function as the main body. It was designed so that In this embodiment, the cylindrical portion 11' and the semi-cylindrical holder 12' can be manufactured separately, which has the advantage of simplifying the manufacturing process for forming the main body. Note that the same reference numerals in the drawings indicate members having the same functions as those of the previous embodiment. Further, reference numeral 81 indicates a plurality of bolt mounting holes provided on the circumferential surface of the cylindrical portion 11'.

This invention is not limited to the above embodiments, but
For example, the bevel angle or shape of a pipe, the shape of a cylindrical concave groove for supporting an O-ring, and the shape of an O-ring.
The contact position between the ring and the groove surface can be arbitrarily designed.

[Brief explanation of the drawing]

Fig. 1 is an explanatory cross-sectional view of the main part showing the conventional example, Fig. 2
Figures 3 and 3 are exploded explanatory diagrams of the constituent parts of the jig of this invention. Figure 2 shows the main body, and Figure a and Figure B and X.
- In the X-ray cross-sectional view, figure b is a side view of figure a, figure 3 shows the holding body, figure a is a cross-sectional view taken along the Y-Y line of figure b, figure b is a side view of figure a, figure 4, Figure 5 is an explanatory diagram of the usage state of the jig of this invention, and Figure 4 a and Figure 4 B are Z-Z.
In the line sectional view, figure B is a side view of figure A, figure 5 is a sectional view of the main part after installation is completed, figure 6 shows another embodiment of this invention, figure a is figure b - line sectional view b is A side view of figure a. 1...Body, 2...Plug, 3...Holding body, 4
... Protrusion, 6 ... Bolt, 11 ... Hollow cylindrical part,
12... Main body side holding body, 18, 33... Concave strip, 2
4... O-ring, 41... Groove portion, 11'... Cylindrical part, 12'... Semi-cylindrical holder, B... Boiler,
P...pipe.

Claims (1)

[Scope of utility model registration request] It is composed of two members: a main body 1 formed of a hollow cylindrical part 11 and a half-cylindrical main body side holder 12 connected thereto, and a holder 3 that is combined with this main body 1,
The hollow cylindrical part 11 has an O that fits closely to the groove surface of the pipe.
The plug 2 carrying the ring is screwed so that it can move forward and backward in the axial direction, and through holes 16 are formed in the axial direction at predetermined intervals in the upper half-cylindrical wall 15 excluding the main body side holder 12 side, Moreover, the semi-cut cylindrical main body side holding body 12 has a semi-cut groove 1 having approximately the same diameter as the outside diameter of the pipe.
7, 19, a recessed line 18 that loosely fits into the protruding line 4 on the outer surface of the pipe and ears 20 are formed on both sides, and the holding body 3 formed as a semi-cylindrical shape 31 has a groove on the main body side holding body 12. Formed semi-cut grooves 17 and 19, semi-cut grooves 32 and 34 having approximately the same diameter and the same shape as the grooved strip 18, grooved strip 33, and ears 38 on both sides, and the semi-cylindrical wall portion 36 corresponds to the through hole 16. Screw hole 3 in the position
5 is formed so that the bolt 6 can be freely screwed into the through hole 16 and the screw hole 35, and the respective ear portions 20,
38 can be freely connected by bolts 5, and the above-mentioned two members thus formed are combined to hold the pipe and seal the pipe opening.