JPH06241378A - Branch port closing device - Google Patents

Abstract

PURPOSE:To simplify the structure of a closing device by reducing the number of parts of the closing device and also using only parts irrelevant to the size of a main pipe for water supply. CONSTITUTION:With the retaining plate 7 of a closing device 3 locked from its rotation, a nut 3 is turned to mutually compress a pressing plate 4, a locking spring 5, a seal member 6, and the retaining plate 7 by a tightening bolt 8. Then the locking spring 5 and seal member 6 are sandwiched between the pressing plate 4 and the retaining plate 7, and expanded gradually in radial direction. After that, the outer surface of the seal member 6 is pressed tightly against the inner surface of a branch port 2 to close the branch port 2 completely. On the other hand, because the outer edge 17 of the locking spring 5 expanded by compression is engaged with the inner surface around the branch port 2, locking of the closing device 3 from the branch port 2 can be achieved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a closing device which is inserted into a branch opening of a fluid line to close it.

[0002]

2. Description of the Related Art A large number of branch pipes are usually arranged in a fluid pipe, for example, a main pipe. These branch pipes may be removed for some reason after installation. in this case,
With the removal of the branch pipe, the branch port provided in the main pipe must be closed. FIG. 7 shows a conventional branch port closing device. This closing device includes a water stopcock 03 that closes off a branch port 02 of a main pipe 01, a semi-tubular holding member 04 that presses and holds the water stopcock 03, and a half member that faces the holding member 04 via the main pipe 01. A tubular facing member 05, a tightening tool 08 made up of a bolt 06 and a nut 07 for tightening the holding member 04 and the facing member 05 around the main pipe 01, and a water stop cock 03 branched by being screwed into the holding member 04. It is composed of a plug 09 that is surely pressed against the mouth 02.

[0003]

In such a conventional closing device, the holding member 0 arranged around the main pipe 01.
The size and shape of the 4 and the facing member 05 are determined by the outer diameter of the main pipe 01 regardless of the size of the branch port 02 to be closed. Therefore, when preparing a closing device in advance for the closing of the branch port 02, not only the size of the branch port 02 but also the size of the main pipe 01 are taken into consideration to manufacture a large number of different blocking device specifications. , Had to manage inventory. Moreover, the holding member 04 and the facing member 05 are relatively large among the members constituting the closing device, and have become an essential factor for increasing the cost of the closing device.

The present invention has been made by paying attention to such a problem, and the holding member and the facing member in the conventional closing device can be omitted to reduce the number of parts and to be independent of the size of the main pipe. The object of the present invention is to provide an extremely simple and inexpensive closure device by using only such parts.

[0005]

In order to achieve the above object, in the present invention, there is provided a closing device which is inserted into a branch opening of a fluid conduit and closes the branch opening, the inside of the fluid conduit. The pressing plate, the locking spring, the seal member, and the pressing plate are arranged in this order from the outer side toward the outer side. The outer diameters of the pressing plate, the locking spring before being compressed, and the sealing member before being compressed are the same as those of the branch port. It is set to be smaller than the inner diameter, and the locking spring and the seal member are expanded in the radial direction by compression with a tightening bolt,
At the time of this expansion, the locking spring is engaged with the inner side surface of the fluid conduit around the branch opening, and the sealing member can be brought into close contact with the inner peripheral surface of the branch opening.

[0006]

After the blocking device is inserted into the branch port of the fluid pipe from the outside, the pressing plate, the locking spring, the seal member and the pressing plate are rotated by the tightening bolt while turning the nut while the pressing plate is stopped. Compress each other. Then, the locking spring and the seal member are sandwiched between the pressing plate and the pressing plate and gradually expand in the radial direction. Eventually, the outer peripheral surface of the seal member is tightly pressure-bonded to the inner peripheral surface of the branch port to completely close the branch port.
On the other hand, the outer edge portion of the locking spring expanded by compression engages with the inner side surface around the branch opening, so that the blocking device is prevented from coming off from the branch opening.

[0007]

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

As shown in FIG. 1, the closing device 3 which is inserted into the branch port 2 of the main pipe 1 and closes the branch port 2 has a pressing plate 4 in order from the inside to the outside of the main pipe 1. A locking spring 5, a seal member 6 and a holding plate 7 are provided. Through holes 9, 1 which are penetrated by tightening bolts 8 from the inside toward the outside are provided at substantially the centers of these members 4, 5, 6, 7.
0, 11, and 12 are formed. In this case, the head portion 13 of the fastening bolt 8 is fixedly or non-rotatably engaged with the pressing plate 4, and the nut 14 is screwed into the free end portion on the opposite side of the fastening bolt 8. Therefore, when the nut 14 is tightened, the members 4, 5, 6, 7 are compressed between the tightening bolt 8 and the nut 14.

The pressing plate 4 is a disc having an outer diameter slightly smaller than the inner diameter of the branch port 2 to be closed, as shown clearly in FIGS. Tube 1
It is curved almost corresponding to the curvature of the inner peripheral surface of the.
Further, the pressing plate 4 is provided with a concave portion 15 for accommodating the head portion 13 of the tightening bolt 8 on its inner surface, and a concave groove capable of accommodating the compressed locking spring 5 almost completely on its outer surface. 16 is provided.

As shown in FIGS. 1 and 3, the locking spring 5 is a substantially rectangular leaf spring curved toward the pressure plate 4 side, that is, toward the inside, with a curvature larger than that of the pressure plate 4. . Both ends 17 of the locking spring 5 are
Has an outer diameter smaller than the inner diameter of the branch port 2 in the uncompressed state, and is therefore partially located in the groove 16 on the outer surface of the pressing plate 4. However, when compressed by the tightening bolt 8, both ends 1 of the locking spring 5 are
7 extends in the radial direction beyond the inner diameter of the branch port 2 and projects from the concave groove 16. The locking spring 5
When is completely compressed, the locking spring 5 is almost entirely housed in the groove 16 of the pressing plate 4.

A seal member 6 made of a flexible material such as rubber
Has a generally convex lens-like shape with the largest thickness in the central portion, as clearly shown in FIGS. The diameter of the outer peripheral surface of the seal member 6 is smaller than the inner diameter of the branch port 2 in a state where the seal member 6 is not yet compressed by the tightening bolt 8, and when compressed and expanded in the radial direction, It is selected so that it can closely adhere to the peripheral surface. The through hole 11 of the seal member 6 and the non-threaded portion of the tightening bolt 8 passing therethrough have a non-circular cross section (for example, an elliptical shape) that fits with each other with a compression gap left therebetween. 8 is prevented from rotating with respect to the seal member 6. Preferably, the inner surface of the seal member 6 is shaped like a truncated cone that projects inward. In such a case, the outer peripheral surface as the sealing surface of the seal member 6 is expanded in the radial direction sufficiently and evenly by the compression to ensure the reliable closure of the branch port 2.

As shown clearly in FIGS. 1 and 5, the holding plate 7 is a disk having an outer diameter larger than the inner diameter of the branch port 2 to be closed, and this disk is preferably a book. It is curved so as to correspond approximately to the curvature of the outer peripheral surface of the tube 1. The holding plate 7 is fixed to the sealing member 6 on the inner side surface, and as a result, is prevented from rotating with respect to the tightening bolt 8 via the sealing member 6. On the outer side surface of the pressing plate 7, a small protrusion 18 for preventing rotation is preferably provided in a protruding manner. However, such a small protrusion 18 can be omitted if the holding plate 7 can be held by some other method.

Next, the process of closing the branch port 2 of the main pipe 1 in the uninterrupted water state using such a closing device will be described.

Since the main pipe 1 is in the water-free state, the branch port 2 must be surrounded by the closed split T-shaped pipe 19 as shown in FIG. 1 even during the closing process.

A split T-shaped tube 19 consisting of a half-split T-shaped tube portion 20 and a band portion 21 is fixed around the main pipe 1 near the branch port 2 by, for example, bolts and nuts. The flow passage 22 of the pipe portion 20 is opposed to the branch port 2. The flow passage 22 of the T-shaped pipe portion 20 is initially closed by a water control valve (not shown), and after the insertion machine 24 including the closing device 3 is attached to the water control valve portion 23, the water control valve is opened. It will be released.

The closure device 3 is held by an inserter 24. The insertion machine 24 has an outer cylinder 26 having a holding and detent means 25 that engages with the small projection 18 of the pressing plate 7, and a tightening shaft 28 that has an engagement hole 27 that engages with the nut 14 of the closing device 3. It is composed of and. The holding and detent means 25 is a ring spring 2 whose axial movement is restricted.
Have nine. The ring spring 29 engages with the constricted portion of the small protrusion 18 of the pressing plate 7 inserted in the axial direction, and prevents the pressing plate 7 from unintentionally coming off.

The closing device 3 is inserted into the branch port 2 by the inserting machine 27. When the outer edge of the inner surface of the holding plate 7 comes into contact with the surface of the main pipe 1 at the peripheral edge of the branch port 2, the insertion by the insertion machine 27 is stopped, and at the same time, the tightening shaft 28 is rotated in the tightening direction. When the nut 14 is rotated with the rotation of the tightening shaft 28, the tightening bolt 8 gradually moves outward, that is, in the upward direction in FIG. 1, whereby the elastic locking spring 5 and the seal are moved. The member 6 and the holding plate 7
And the pressing plate 4 are compressed.

By this compression, as already explained,
Both ends 17 of the locking spring 5 expand radially beyond the inner diameter of the branch port 2 and project from the concave groove 16 of the pressing plate 4, and the seal member 6 also expands in the radial direction to branch the branch port 2.
It closely adheres to the inner surface of the. However, in this case, the outer cylinder 2
The rotation of 6 is blocked and therefore the tightening bolt 8
Is non-rotatably held via the seal member 6, the pressing plate 7, the holding / rotating means 25, and the outer cylinder 26.

As shown in FIG. 6, the locking spring 5 is finally positioned in the concave groove 16 of the pressing plate 4 and has its both ends 17 abuttingly engaged with the inner peripheral surface of the main pipe 1. To do. As a result, the compression of the sealing member 6 by the pressing plate 4 is performed evenly in the circumferential direction, and the uniform radial expansion of the sealing surface of the sealing member 6 is achieved, and at the same time, the branch port 2 of the closing device 3 is provided. It is also reliably prevented from falling off.

Finally, the split T-shaped pipe 19 is removed from the main pipe 1 to complete the closing work.

[0021]

According to the present invention, the closure device is composed of parts related only to the diameter of the branch port to be closed,
Moreover, since the number of parts is extremely small, manufacturing and inventory management are easier than the conventional closing device provided with a holding member and a facing member arranged around the main pipe. The closing work of is extremely easy.

[0022]

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of a main tube and a closure device of the present invention.

FIG. 2 is a plan view of a pressing plate that constitutes the closing device of the present invention.

FIG. 3 is a plan view of a locking spring that constitutes the closing device of the present invention.

FIG. 4 is a side view of a seal member that constitutes the closure device of the present invention.

FIG. 5 is a plan view of a holding plate that constitutes the closing device of the present invention.

FIG. 6 is a cross-sectional view showing a state where the branch port of the main pipe is closed by the closing device of the present invention.

FIG. 7 is a cross-sectional view of a main pipe showing a conventional closing device.

[Explanation of symbols]

1 Main Pipe 2 Branch Port 3 Closing Device 4 Pressing Plate 5 Locking Spring 6 Sealing Member 7 Holding Plate 8 Tightening Bolt 9 Through Hole 10 Through Hole 11 Through Hole 12 Through Hole 13 Head 14 Nut 15 Recess 16 Recessed Groove 17 Engagement Ends of stop springs 18 Small protrusions 19 Split T-tubes 20 T-tubes 21 Bands 22 Flow passages 23 Water control valves 24 Insertion machines 25 Holding and detent means 26 Outer cylinders 27 Engagement holes 28 Tightening shafts 29 Rings Spring

Claims (8)

[Claims] 1. A closing device which is inserted into a branch opening of a fluid conduit and closes the branch opening, wherein a pressing plate, a locking spring, a sealing member and a sealing member are arranged in order from the inside to the outside of the fluid conduit. The holding plates are arranged, and a tightening bolt for compressing each of these members via a nut extends through substantially the center of each of the members, and at least is prevented from rotating with respect to the holding plate. The outer diameters of the pressing plate, the locking spring before being compressed, and the sealing member before being compressed are set to be smaller than the inner diameter of the branch port. It is expanded in the radial direction by compression with a tightening bolt, and at the time of this expansion, the locking spring engages with the inner side surface around the branch opening of the fluid pipe, and the sealing member contacts the inner peripheral surface of the branch opening. Branching that can be closely attached Mouth closure device. 2. The branch port closing device according to claim 1, wherein an outer diameter of the holding plate is set to be larger than an outer diameter of the branch port. 3. The branch port closing device according to claim 1, wherein an inner surface of the seal member has a truncated cone shape protruding inward. 4. The locking spring is a leaf spring whose both ends are curved inward, and both ends of the locking spring before being compressed are supported by pressing plates, and the locking spring is The branch port closing device according to any one of claims 1 to 3, wherein a central portion of the branch is supported by a seal member. 5. The branch port closing device according to claim 1, wherein the pressing plate is curved substantially corresponding to the curvature of the inner peripheral surface of the fluid conduit. 6. The branch port closing device according to claim 1, wherein a concave groove capable of completely containing the compressed locking spring is formed on an upper surface of the pressing plate. . 7. The pressing plate is prevented from rotating with the tightening bolt through a seal member.
Of the branch opening according to item 3. 8. The small protrusion for preventing rotation is provided on the outer surface of the pressing plate in a protruding manner.
Of the branch opening according to item 3.