JP7158907B2 - Leak prevention device and its mounting method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a leak prevention tool for preventing leakage of fluid inside a flow path forming member, and a method of attaching the same.

In the past, for example, water pipes and other flow path components buried underground may experience cracks, gaps, deterioration, etc. due to ground vibration or soil pressure caused by earthquakes, automobiles, etc., or due to aging, etc., resulting in unexpected leakage accidents. can cause. As a repair work for this type of leakage point, a leakage prevention tool consisting of a divided housing divided into a plurality of parts in the circumferential direction is used, and the divided housing is attached to the leaking part or damaged part of the flow path constituent member via packing. There is a type that seals against fluid leakage by sealingly fitting on the outside and fastening the flanges of the divided housings with bolts and nuts. (See Patent Document 1, for example).

In addition, in such repair work, long continuous cracks in the direction of the flow path may occur in the flow path constituent members, or multiple leak points that are intermittently connected along the direction of the flow path or are close to each other may occur. Therefore, in order to cope with the extension of the leakage location such as cracks, a plurality of split-structure housings with packing on the inner peripheral surface are arranged in series in the pipe axial direction of the flow path constituent members. , there is a leakage prevention tool that prevents fluid leakage from the leakage point (see, for example, Patent Document 2).

Japanese Utility Model Publication No. 37-24256 (page 1, FIG. 2) Japanese Utility Model Publication No. 46-27163 (page 1, FIG. 1)

However, in Patent Document 2, although a plurality of housings can be arranged side by side according to the length of the leaking portion occurring in the flow path component in the pipe axis direction and fitted externally, the housings are arranged side by side in the pipe axis direction. The one housing is arranged in contact with the end of the other housing such that the one housing presses the end of the packing provided on the inner peripheral surface of the other housing. Therefore, as a result of the packing being pressed by both housings arranged side by side in the pipe axis direction and receiving uneven pressing force, sufficient leakage prevention function cannot be obtained at the connecting portion between these housings arranged side by side. There is a problem that there is a risk that the

The present invention has been made by paying attention to such problems, and is capable of being externally fitted corresponding to the length of the leaking portion that occurs along the flow path direction of the flow path constituting member, and is capable of sufficient leakage. It is an object of the present invention to provide a leak preventive device capable of exhibiting a preventive function and a method of mounting the leak preventive device.

In order to solve the above problems, the leakage prevention tool of the present invention is
A leak prevention tool for preventing leakage of fluid inside a flow path forming member,
A first housing having a sealing material on its inner peripheral portion and fitted onto the flow path forming member, and a sealing material on its inner peripheral portion and arranged side by side with the first housing in the direction of the flow path. and a second housing that is externally fitted to the flow path forming member; 2, and an annular sealing material superimposed in the radial direction of the flow path forming member.
According to this feature, the annular sealing material disposed between the first and second housings that are sequentially arranged in parallel in the flow path direction of the flow path forming member and fitted on the outside is attached to the inner peripheral portion of these housings. By overlapping with the provided sealing material in the radial direction, the sealing performance of the connection portion between the plural housings arranged side by side is improved, and a sufficient leakage prevention function can be exhibited.

The first housing and the second housing are characterized by having a pressing portion that presses the annular sealing material in an inner diameter direction.
According to this feature, the sealing function of the annular seal member can be enhanced by pressing the annular seal member with the pressing portions of the first and second housings.

The annular seal member is characterized by being formed in a tapered shape toward the flow path direction of the flow path forming member.
According to this feature, the sealing members of the first and second housings radially overlap with the tapered annular sealing member, thereby widening the contact area between the sealing member and the annular sealing member. can be done.

The sealing material of the first housing and the sealing material of the second housing are characterized in that they are positioned on the outer diameter side of the annular sealing material and overlapped.
According to this feature, the first and second housings provided with the sealing material apply a pressing force in the inner diameter direction to the annular sealing material by using the fitting force of the sealing material fitted onto the flow path forming member. be able to.

The annular seal member has elasticity, and is fitted onto the flow path forming member by bonding both end surfaces of the annular seal member to each other.
According to this feature, simply by winding the annular sealing material at an arbitrary position of the flow path forming member and bonding both end surfaces to each other, the elastic restoring force allows the ring sealing material to be brought into close contact with the flow path forming member. diameter pipe.

It is characterized in that the first housing and the second housing are provided with fastening members for fastening the housings to each other.
According to this feature, by fastening the first and second housings together with the fastening member, it is possible to clamp the annular sealing material disposed between these housings.

The sealing material of the first housing and the sealing material of the second housing include an extending portion extending in the axial direction of the flow path forming member and the annular seal extending in the circumferential direction of the flow path forming member. It is characterized by comprising a peripheral side portion that overlaps with the material, and a bridging portion that spans the extension portion and the peripheral side portion and extends in a curved shape.
According to this feature, since the bridging portion provided over the extending portion extending in the axial direction of the flow path component and the peripheral side portion extending in the circumferential direction extends in a curved line, these extending portions, Not only is it easy to dispose the sealing material having the peripheral side portion and the bridging portion on the inner peripheral portions of the first and second housings, but stable sealing performance can be obtained over the entire circumference of the sealing material.

In order to solve the above problems, a method for attaching a leakage prevention tool according to the present invention includes:
A method for attaching a leak prevention tool for preventing leakage of fluid inside a flow path forming member, comprising:
A first housing having a split structure having a sealing material on the inner periphery and a sealing material on the inner periphery are provided at positions sandwiching a fluid leakage point generated on the outer surface of the flow path constituting member in the flow path direction. A second housing having a divided structure is fitted to the flow path forming member, and an annular sealing material is provided between the first housing and the second housing to form the flow path. externally fitted to the member,
By drawing the first housing and the second housing together, the annular sealing material is moved to the flow path between the sealing material of the first housing and the sealing material of the second housing. arranged so as to overlap in the radial direction of the constituent members,
The first housing is hermetically fastened to the flow path forming member, and the second housing is hermetically fastened to the flow path forming member.
According to this feature, the annular sealing member is arranged between the first and second housings that are arranged side by side in the direction of the flow passage of the leaking flow passage forming member and are fitted on the outside. By overlapping the sealing material provided on the inner circumference of each housing in the radial direction, the sealing performance of the joints between multiple housings arranged side by side corresponding to the length of the leak location is improved, and sufficient leakage is achieved. A preventive function can be exhibited.

It is a front view which shows the leakage prevention tool in an Example. (a) is a partial cross-sectional side view showing a housing that constitutes the leak prevention device, and (b) is a cross-sectional view taken along the line AA of (a). (a) is a front view of a split housing, (b) is a cross-sectional view taken along line BB of (a), and (c) is a side view of the split housing. (a) is a view in the direction of arrow C in FIG. 3(b), and (b) is a cross-sectional view taken along line DD in FIG. 3(b). (a) is a front view of the sealing material, (b) is a cross-sectional view along EE of (a), and (c) is a cross-sectional view along FF of (a). (a) is a front view showing a state in which an annular seal material is fitted around a fluid pipe, (b) is a partially cross-sectional side view of the same, and (c) is a cross-sectional view along GG of (b). . FIG. 4 is a partial cross-sectional side view showing a state in which the first housing is loosely fitted to the fluid pipe; FIG. 10 is a front view showing a situation in which the first and second housings fitted over the fluid pipe are drawn together; FIG. 4 is a partial cross-sectional side view showing a state in which the first housing is tightly fitted onto the fluid pipe; It is a figure which shows. (a) is a front cross-sectional view showing an annular sealing material fitted on a fluid pipe and first and second housings, and (b) is an enlarged view of a main part of the first and second housings pulled together. , and (c) is an enlarged view of a main part in which the first and second housings are tightened. (a) is an enlarged view of a main part showing a modification of pressing portions of first and second housings, and (b) is an enlarged view of a main part showing a first modification of an annular sealing material and a sealing material; (c) is an enlarged view of a main portion showing a second modification of the annular sealing material and the sealing material. 4(a) and 4(b) are enlarged views of essential parts showing leak prevention devices fitted onto fluid pipes having different outer diameters. FIG.

EMBODIMENT OF THE INVENTION The form for implementing the leakage prevention tool which concerns on this invention, and its attachment method is demonstrated below based on an Example.

A leak prevention device according to an embodiment and a method of attaching the same will be described with reference to FIGS. 1 to 12. FIG. First, reference numeral 10 in FIG. 1 denotes a leak prevention device to which the present invention is applied.

As shown in FIGS. 1 and 2, the leakage prevention device 10 includes a first housing 5 having a split structure in the circumferential direction, a second housing 5 ′ having a split structure in the circumferential direction, and It mainly includes an annular seal member 17 interposed between the housings 5, 5'. Each of the housings 5, 5' constituting the leak prevention device 10 is composed of arc-shaped divided housings 11, 12, 13 which are divided into three substantially equally in the circumferential direction in this embodiment. The housings 11, 12, and 13 are externally fitted in series in parallel on the outer peripheral surface including the damaged portion P generated along the pipe axis direction on the pipe wall of the fluid pipe 1 as a flow passage component, and the divided housing is formed. By fastening the opposing flanges 4, 4 of the bodies 11, 12, 13 with a plurality of bolts and nuts 3, the sealing of the inside of the housings 5, 5' is ensured, and fluid leakage from the damaged portion P is prevented. It is designed to prevent.

Here, the fluid pipe 1 of this embodiment is, for example, made of ductile cast iron for water supply and having an outer diameter of a predetermined dimension to be buried substantially horizontally in the ground. The surface is covered with a mortar layer. In addition, the fluid pipe according to the present invention may be made of metal such as cast iron or steel, concrete, vinyl chloride, polyethylene or polyolefin. Furthermore, the inner peripheral surface of the fluid pipe is not limited to the mortar layer, but may be coated with, for example, an epoxy resin or the like, or the inner peripheral surface of the fluid pipe may be coated with an appropriate material by powder coating. In this embodiment, the fluid in the fluid pipe is tap water, but it is not limited to tap water in this embodiment. It doesn't matter if it is.

Damaged portions P of the fluid pipe 1 include cracks caused by ground vibration or soil pressure due to earthquakes, automobiles, etc., uneven subsidence of the ground, excessive fluid pressure, aging, etc., as well as holes and holes caused by corrosion. Includes cracks, etc. In this embodiment, the damaged portion P is described as extending continuously or intermittently in the straight pipe portion of the fluid pipe 1 along the direction of the pipe axis, but the location where the damaged portion is generated is not limited to the above. It can occur in various places, for example, leakage from the vicinity of the joint part connecting the fluid pipes or from the leaking part generated in the joint part itself, the bent pipe part of the fluid pipe, the sleeve of the valve housing, etc. The leakage prevention device according to the present invention can be applied to damaged portions P that can occur at various locations.

Next, the structure of the first housing 5 will be described. Note that the second housing 5' has the same structure as the first housing 5, so redundant description of the structure of the second housing 5' is omitted.

As shown in FIGS. 2 to 4, each of the divided housings 11, 12, and 13, which are formed in an arc shape and constitute the first housing 5, are made of metal, resin, or the like. and has an accommodation space for accommodating a certain amount of leaked fluid between it and the outer peripheral surface of the fluid pipe 1 . A sealing material 16 is fitted in a concave portion 6 formed in the inner peripheral portion of each of the divided housings 11, 12, and 13. As shown in FIG.

As shown in FIG. 2( a ), the first divided housing 11 is provided with a projection 15 which protrudes in a cylindrical shape in the outer diameter direction at substantially the center in the circumferential direction and has a discharge port penetrating at the tip end, A male threaded portion 7a of a discharge cap 7 having a discharge passage 7b is detachably screwed into a female threaded portion 15a on the inner peripheral surface of the protruding portion 15. As shown in FIG. More specifically, the discharge passage 7b of the discharge cap 7 is formed so that the tip surface and the outer peripheral surface of the discharge cap 7 communicate with each other. Instead of the discharge cap 7, a lead-out hose (not shown) connected via a gate valve such as a ball valve may be used to discharge the leaked fluid inside the housing 5 to an appropriate location outside. In this embodiment, the first divided housing 11 is arranged at a position where the protrusion 15 faces upward, and the second divided housing 12 and the third divided housing 13 are connected.

Further, as shown in FIGS. 3 and 4, the other divided housings 12 and 13 are also provided with a projection 15' protruding radially outward at substantially the center in the circumferential direction. It differs from the projecting portion 15 of the first divided housing 11 in that it does not have a tip end surface and is closed. That is, the divided housings 11, 12, and 13 are configured to have substantially the same shape as each other except for the shape of the protrusions described above.

In the present embodiment, the first housing 5 and the second housing 5' have a structure in which they are divided into three parts at substantially equal intervals in the circumferential direction. Also, the number of divisions may be two or may be four or more. In the present embodiment, two housings 5 and 5' are arranged side by side and fitted on the fluid tube 1, but this is not limitative. It may be fitted over the tube 1 . Further, the piping direction of the fluid pipe 1 is not limited to horizontal, and may be vertical, for example.

Next, as shown in FIGS. 4 and 5, the sealing member 16 fitted into the recess 6 on the inner peripheral portion of each of the divided housings 11, 12 and 13 will be described. The seal member 16 is made of an elastic material formed in an endless shape, and includes a pair of extending portions 16A extending linearly substantially parallel to the pipe axial direction of the fluid pipe 1 and a circumferential direction of the fluid pipe 1, that is, the extending portion 16A. It has a pair of circumferential side portions 16B extending substantially parallel to the orthogonal direction, and bridging portions 16C at the four corners extending in a curved line across the extending portions 16A and the circumferential side portions 16B.

As shown in FIG. 5, on the inner diameter side where the sealing material 16 contacts the outer surface of the fluid pipe 1, the extension portion 16A, the peripheral side portion 16B, and the bridging portion 16C extend over the entire circumference of the fluid pipe 1. A plurality of ridges 16a (four in the present embodiment) projecting inwardly are provided, and a tapered portion 16b is formed toward the inner peripheral edge of the ridges 16a. A flat surface 16e is formed on the opposite side of the ridge portion 16a of the seal member 16, and a fitting portion 16d protruding in the outer diameter direction of the fluid pipe 1 is formed on the flat surface 16e at the center of the extending portion 16A. is provided.

Further, as shown in FIG. 4, a concave portion 6 into which the outer diameter side of the seal member 16 is fitted is formed in an annular shape in the inner peripheral portion of each of the split housings 11, 12, and 13. is positioned and fitted in this recess 6 . More specifically, the recessed portion 6 is formed so as to narrow in the inner diameter direction by the inclined portion 8 and the projecting portion 9 projecting to the inner peripheral portion of the divided housings 11 , 12 , 13 . The tapered portion 16b on the side is fitted to the inside of the protruding portion 9 forming the recess 6 without a gap, and the outer peripheral side of the sealing material 16 has a gap between it and the inside of the inclined portion 8 forming the recess 6. The gap is used as an elastic deformation allowance for the seal member 16 .

Furthermore, since a concave fitted portion 6d is formed in the axial direction of the fluid pipe 1 at the bottom of the recess 6 corresponding to the fitting portion 16d of the sealing material 16, the fitting portion 16d of the sealing material 16 are fitted and positioned within the recess 6 . In particular, when the divided housings 11, 12, and 13 are tightened with the bolts and nuts 3, the pressure gradually increases, and the fluid spurts from the divided portions. 6d are fitted to each other, the sealing material 16 will not come off. Particularly, in this embodiment, the fitting is stable with a length of 1/3 or more of the length of the divided housings 11, 12, and 13 in the tube axial direction, and the sealing material 16 does not come off. Moreover, there is no fear of corrosion because the sealing material made of elastic material such as rubber and the divided housing made of metal are fitted together.

Next, as shown in FIG. 6, the annular seal member 17 interposed between the first housing 5 and the second housing 5' will be described. The annular seal member 17 is made of a band-shaped elastic material with an extension that is substantially the same as or slightly shorter than the outer circumference of the fluid pipe 1, and both end surfaces 17A and 17B thereof are formed to be inclined with respect to the bottom surface 17e so as to complement each other. there is

Further, as shown in FIG. 6C, the cross-sectional shape of the annular seal member 17 is uniform along the circumferential direction except for both ends thereof, and the bottom surface side, which is the side in contact with the outer surface of the fluid pipe 1, is It is formed in a generally hat-shaped cross-section that is symmetrical in the drawing and is wide in the pipe axis direction. More specifically, the annular seal member 17 has an outer peripheral surface 17a extending substantially parallel to the bottom surface 17e on the outermost diameter side, inclined surfaces 17b continuing to both sides in the width direction of the outer peripheral surface 17a and inclined sideways, and further inclined surfaces 17b. A tapered surface 17c is formed on a fin portion 17d that continues to the fin portion 17d and tapers toward the side end portion.

Next, a method for attaching the leak prevention device 10, that is, a process for preventing fluid leakage from the damaged portion P generated in the fluid pipe 1 will be described.

As shown in FIGS. 1 and 6, in the case of a fluid pipe 1 that constitutes an existing flow path buried in the ground, a leak point is identified by a known method, and the leak is excavated to excavate the damaged portion of the fluid pipe 1. A predetermined section containing P is exposed. In this leakage prevention process, it is necessary to immediately prevent leakage that continues even during the work of the process. A section is used as a working space.

After cleaning the outer surface of the fluid pipe 1, as shown in FIGS. The end faces 17A and 17B of the annular sealing member 17 are adhered together by winding so that the bottom face 17e of the sealing member 17 is in contact with the outer face of the fluid tube 1. As shown in FIG. Since both end surfaces 17A and 17B of the annular seal member 17 are formed as inclined surfaces so as to complement each other, a large contact area can be secured between them, which not only increases the adhesive strength but also seals from the adhesive portion. can be improved. It is preferable to apply a lubricant to the outer surface of the fluid pipe 1 and the annular seal member 17 after bonding.

Next, as shown in FIGS. 7 and 8, the first housing 5 and the second housing 5' are attached to the fluid pipe 1 at positions sandwiching the damaged portion P and the annular seal member 17 in the pipe axial direction. It fits loosely on the outside. Next, as shown in FIG. 9, the bolts and nuts 3 inserted through the flanges 4, 4 of the divided housings 11, 12, 13 each having the sealing material 16 on the inner periphery thereof are loosely tightened in sequence. At this time, a lubricant may be applied to the ridge portion 16 a of the sealing material 16 . Alternatively, the first housing 5, the annular seal member 17, and the second housing 5' may be positioned upstream or downstream of the damaged portion P in this order.

By fitting the first housing 5 and the second housing 5' to the fluid pipe 1 at positions that avoid leakage points in this way, the initial mounting work of these housings 5 and 5' can be performed. The installation work can be easily performed without being interfered with by the leaked fluid.

At this time, the divided housings 11, 12, and 13 are loosely fitted together so that the circumferential position of the facing portion where the divided housings 11, 12, and 13 face each other is different from the circumferential position of the damaged portion P. let me Similarly, the annular sealing material 17 is wound so that the circumferential position of the bonding portion where the end surfaces 17A and 17B of the annular sealing material 17 face each other and are bonded is different from the circumferential position of the damaged portion P.

Subsequently, as shown in FIG. 8, the first housing 5 and the second housing 5' are moved in the direction of the tube axis of the fluid tube 1 so as to be attracted to each other by using an unillustrated pulling means or the like. and positioned to cover the entire damaged portion P, that is, the leaking portion. Incidentally, in this embodiment, the divided housings 11, 12, 13 of the first housing 5 and the second housing 5' are attached at substantially the same positions in the circumferential direction. At this time, by applying a lubricant to the bottom surface 17e of the annular seal member 17 and the ridge portion 16a of the seal member 16, it is possible to suppress the sliding resistance that occurs when the annular seal member 17 and the annular seal member 17 and the ridge portion 16a of the seal member 16 are pulled together. Damage to the sealing material 16 can be prevented. Further, in this embodiment, a plurality of fastening members 2 made of bolts and nuts are arranged in the pipe axial direction on the flanges 5a of the facing portions of the first housing 5 and the second housing 5' along the circumferential direction. is provided. Therefore, by fastening the fastening member 2, the force that pulls the housings 5 and 5' toward each other can be easily transmitted to the facing portion, and can be fixed at the position where they are pulled together.

At this time, as shown in FIG. 9, the male threaded portion 7a of the discharge cap 7 is screwed into the female threaded portion 15a of the protrusion 15 of the split housing 11 only at the distal end side, so that the discharge cap 7 is ejected. Since the path 7b can be opened to the outside, leakage fluid accumulated inside the first housing 5 and the second housing 5' during the mounting work of the first housing 5 and the second housing 5' can be prevented. can be discharged to the outside through the discharge path 7b. Therefore, in the process of installing the leakage prevention device according to the present invention, it is possible to suppress the increase of the internal pressure of the first housing 5 and the second housing 5', and the annular seal member 17 and the seal member 16 are prevented from being excessively exposed. It is possible to avoid misalignment and curling without applying a load. The arrangement position of the projection 15 is not limited to this embodiment. Almost all of the air to be discharged can be exhausted.

Further, as shown in FIG. 10, the annular sealing material 17 disposed between the first housing 5 and the second housing 5' follows the pull of these housings 5 and 5' toward each other. and move in the direction of the tube axis, and are housed in the housing portion 18 formed by abutting the substantially symmetrical ends of the housings 5 and 5' facing each other. More specifically, the accommodating portion 18 of this embodiment includes flanges 19, 19 that press against the outer peripheral surface 17a of the annular seal member 17, and an annular shape that continues to the flanges 19, 19 and is tapered toward the inner diameter direction. and inclined portions 8, 8 for pressing the inclined surface 17b of the seal member 17. As shown in FIG. That is, these flange portions 19 and 19 and inclined portions 8 and 8 are configured as pressing portions that press the annular seal member 17 .

As shown in FIG. 10(b), the annular sealing member 17 in the housing portion 18 is divided into sealing members 16 inside the first housing 5 on both sides thereof and inside the second housing 5'. It is disposed in close contact with the sealing member 16 formed by the sealing member 16 so as to radially overlap with the fluid pipe 1 . More specifically, the ridges 16a, 16a of the sealing members 16, 16 are in close contact with each other while being arranged on the outer diameter side of the fluid pipe 1 with respect to the tapered surfaces 17c, 17c of the annular sealing member 17. As shown in FIG.

Next, after tightening the fastening member 2 to complete the drawing of the first housing 5 and the second housing 5', the loosely fastened bolts and nuts 3 are tightened. At this time, as shown in FIG. 2(b), the annular sealing material 17 and the sealing material 16 are overlapped in the radial direction of the fluid tube 1, but the sealing materials do not overlap at the divided portions of the divided housings 11, 12, and 13. Due to the curvilinear shape of the bridging portion 16C of 16, there may be a portion X with little or no polymerization. With the completion of the fastening of the bolts and nuts 3, the first housing 5 and the second housing 5' made up of the divided housings 11, 12, and 13 are constructed, and the seal materials 16, 16 and the inner surfaces thereof are formed. The annular sealing member 17 seals the outer surface of the fluid pipe 1 including the damaged portion P. After the fastening process and fastening of the bolts and nuts 3, the fluid leaking from the damaged portion P fills the inside of the first housing 5 and the second housing 5', and furthermore, the discharge passage 7b in the open state of the discharge cap 7 is filled. Wastewater is treated through By completely screwing the male screw portion 7a of the discharge cap 7 of the first housing 5 and the second housing 5' into the female screw portion 15a of the protrusion 15 after the completion of fastening of the bolt and nut 3, , an O-ring 7c provided on the discharge cap 7 terminates the fluid discharge from the discharge passage 7b.

As described above, according to the leakage preventive device 10 and the mounting method thereof of the present invention, the first housing 5 and the second housing 5 which are sequentially arranged side by side in the flow path direction of the fluid pipe 1 and fitted on the outside. ' overlaps with the seal members 16, 16 provided on the inner periphery of the housings 5, 5' in the radial direction. Corresponding to the leakage point from the damaged portion P caused by the leakage, the sealing property of the connection portion between the housings 5 and 5' arranged side by side is improved, and a sufficient leakage prevention function can be exhibited.

Further, the sealing function of the annular seal member 17 can be enhanced by pressing the annular seal member 17 with the flange portion 19 and the inclined portion 8 serving as the pressing portions of the first housing 5 and the second housing 5'. can be done. In particular, since the first housing 5 and the second housing 5' have flanges 19, 19 and inclined portions 8, 8 having substantially the same shape, the sealing function of the annular seal member 17 is uniform. can be increased to

In addition, the annular seal member 17 has a fin portion 17d having a tapered surface 17c and the seal members 16, 16 are overlapped in the radial direction of the fluid pipe 1, so that the contact between the seal members 16, 16 and the annular seal member 17 is reduced. A wide area can be taken.

Furthermore, the sealing material 16 of the first housing 5 and the sealing material 16 of the second housing 5' are located on the outer diameter side of the annular sealing material 17 and superimposed, so that the sealing material 16 , 16, the first housing 5 and the second housing 5' are fitted onto the fluid pipe 1, and the sealing members 16, 16 apply a pressing force to the annular sealing member 17. be able to.

Further, by simply winding the annular sealing material 17 at an arbitrary position of the fluid pipe 1 and adhering the both end faces 17A and 17B to each other, the elastic restoring force of the annular seal material 17 can be brought into close contact with the fluid pipe 1 .

Further, by fastening the first housing 5 and the second housing 5' to each other with the fastening member 2, the annular sealing material 17 arranged between the housings 5 and 5' can be pinched. can.

Further, the sealing material 16 of the first housing 5 and the sealing material 16 of the second housing 5' are formed to have substantially the same shape as each other. , and the circumferential side portion 16B extending in the circumferential direction. Not only can it be easily arranged in the inner peripheral portions of the first housing 5 and the second housing 5', but also a stable sealing performance can be obtained over the entire circumference of the sealing material 16. FIG.

In addition, since the annular seal member 17 is formed in a substantially symmetrical shape when viewed in cross-section in the pipe axis direction of the fluid pipe 1, the first housings arranged on both sides of the fluid pipe 1 with the annular seal member 17 interposed therebetween 5 and the sealing material 16 of the second housing 5' are configured to have substantially the same shape, an equivalent sealing function can be obtained.

Furthermore, as described above, the divided housings 11, 12, 13 are fastened together so that the circumferential position of the facing portion where the divided housings 11, 12, 13 face each other is different from the circumferential position of the leakage point. As a result, at the leak point, the annular seal member 17 is pressed radially inward by the seal member 16 provided on the inner periphery of each of the divided housings 11, 12, and 13, so that the leak point is prevented. A high sealing function can be exhibited in

Similarly, the annular seal material 17 is wound such that the circumferential position of the bonded portion where the end surfaces 17A and 17B of the annular seal material 17 face each other and adhere is different from the circumferential position of the damaged portion P. As a result, the extended portion of the annular seal member 17 excluding the end surfaces 17A and 17B presses the leaking portion in the radial direction toward the leaking portion, thereby maintaining a high sealing function.

Further, as shown in FIG. 10(a), each of the first housing 5 and the second housing 5' has flanges 19, 19 having the same shape on both sides in the pipe axis direction, and inclined portions 8, 8, for example, when the leakage point is long in the pipe axis direction of the fluid pipe 1, three or more of these housings 5, 5', . . . By similarly interposing annular sealing materials 17 between 5, 5', .

Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and any changes or additions within the scope of the present invention are included in the present invention. be

For example, in the above-described embodiment, the pressing portion that presses the annular seal member 17 in the housing portion 18 includes the flange portions 19, 19 and the inclined portions 8, 8 of the first housing 5 and the second housing 5'. However, not limited to this, for example, as a modification of the pressing portion, as shown in FIG. A raised bulge 28 may be formed. By doing so, the annular seal member 17 can be positively pressed by the bulging portion 28, so that the elastic repulsive force of the annular seal member 17 can be increased and the sealing function can be improved.

Further, for example, in the above-described embodiment, the annular seal member 17 is formed in a substantially hat-shaped cross-section having an outer peripheral surface 17a, an inclined surface 17b, and a fin portion 17d having a tapered surface 17c. However, not limited to this, for example, as a first modification of the annular sealing material and the sealing material, as shown in FIG. 11(b) , The annular seal member 27 is formed in a substantially trapezoidal cross-sectional shape having only an outer peripheral surface 27a and an inclined surface 27b. It may have a surface 26b. By doing so, it is possible to secure a large contact area where the inclined surface 27b of the annular seal member 27 and the flat surface 26b of the seal member 26 come into close contact with each other.

In addition, as shown in FIG. 11(b), a gap portion 27c may be formed in a part of the bottom surface 27e of the annular seal member 27. By doing so, the annular seal member 17 is pressed. The gap portion 27c can be used as an elastic deformation margin at the time. In this case, when the first housing 5 and the second housing 5′ are pulled together by the fastening member 2, the annular sealing material 27 and the sealing material 26 do not come into contact with each other at first. Since the annular sealing material 27 and the sealing material 26 are overlapped in the radial direction of the pipe 1, fastening is easy.

Further, for example, in the above-described embodiment, the ridge 16a of the sealing material 16 is arranged in the outer diameter direction of the fluid tube 1 from the tapered surface 17c of the annular sealing material 17 so as to be in close contact therewith. First, for example, as a second modified example of the annular sealing material and the sealing material, as shown in FIG. The sealing member 36 has a convex portion 36b adjacent to the ridge portion 36a and convex in the inner diameter direction toward the annular sealing member 37. may have. By doing so, the projecting portion 36b of the sealing material 36 is arranged in the inner diameter direction of the fluid pipe 1 from the recessed surface 37c of the annular sealing material 37, and can be configured to be closely fitted by concave-convex fitting. can.

Further, for example, in the above-described embodiment, the leakage prevention device 10 according to the present invention is attached to the fluid tube 1 having a predetermined outer diameter to prevent leakage of the internal fluid, but the leakage prevention device 10 prevents leakage. The target fluid pipe is not limited to a fluid pipe with a constant outer diameter, and as long as it is a fluid pipe to which the leakage prevention device 10 can be fitted, only the annular seal material and the seal material can be replaced with different specifications. , it can be attached to correspond to a certain range of outer diameter dimensions including the outer diameter dimension of the fluid pipe 1 .

More specifically, for example, as shown in FIG. 12(a), in the case of a cast-iron pipe 1A having substantially the same diameter or a slightly larger diameter than the fluid pipe 1 of the above embodiment, the leak prevention tool 10 is provided in the housing as in the above embodiment. By providing the annular sealing material 17 and the sealing material 16 on the inner peripheral portions of the bodies 5 and 5', the bodies 5 and 5' are hermetically fitted onto the cast iron pipe 1A, and leakage can be prevented. On the other hand, as shown in FIG. 12(b), in the case of a steel pipe 1B having an outer diameter dimension smaller than that of a cast iron pipe 1A by the dimensional difference σ, the leak prevention tool 10 has the same housings 5, 5 By providing an annular seal member 57 larger than the annular seal member 17 and a seal member 56 larger than the seal member 16 at the inner peripheral portion of ', the steel pipe 1B having a smaller diameter than the fluid pipe 1 and the cast iron pipe 1A It can also be hermetically fitted and leak-proof.

Further, the structure according to the above-described embodiment, the structure of the modified example of the pressing portion according to FIG. The structure of the second modified example of the annular sealing material and the sealing material according to FIG. 11(c) and the structure of the modified example of the pipe diameter according to FIGS. You may do so.

1 Fluid tube (flow path constituent member)
1A cast iron pipe (flow path constituent member)
1B steel pipe (flow path constituent member)
2 Fastening member 3 Bolt/nut 4 Flange 5 First housing 5' Second housing 6 Recess 6d Fitted portion 7 Discharge cap 8 Inclined portion (pressing portion)
9 Protruding portion 10 Leakage prevention device 11, 12, 13 Divided housing 16 Sealing material 16A Extension part 16B Peripheral side part 16C Bridge part 16a Ridge part 16d Fitting part 17 Annular sealing material 17A, 17B End surface 17b Inclined surface 17c Taper Surface 17d Fin portion 18 Accommodating portion 19 Flange (pressing portion)
26 sealing member 26a ridge portion 26b flat surface 27 annular sealing member 27c gap portion 28 bulging portion (pressing portion)
36 sealing member 36a ridge portion 36b projecting portion 37 annular sealing member 37c recessed surface 56 sealing member 57 annular sealing member

Claims (5)

A leak prevention tool for preventing leakage of an internal fluid from a flow path component whose inside is sealed,
It has a sealing material made of an elastic material on the inner peripheral part, and has a first housing with a split structure in the circumferential direction that is fitted to the flow path constituting member, and a sealing material made of an elastic material on the inner peripheral part. and a second housing having a split structure in the circumferential direction, which is arranged in parallel with the first housing in the direction of the flow path and is fitted on the flow path forming member, and is formed into an annular shape by adhering both end faces to each other. and is externally fitted to the flow path forming member between the first housing and the second housing, and the sealing material of the first housing and the sealing material of the second housing and an annular seal member made of an elastic material that is superimposed on the inner diameter side in the radial direction of the flow path forming member, and the first housing and the second housing are composed of: A leak prevention device , comprising a pressing portion that presses the annular sealing material in an inner diameter direction . 2. The leak prevention device according to claim 1 , wherein the annular seal member is tapered toward the direction of the flow path of the flow path forming member. 3. The leak prevention device according to claim 1, wherein the first housing and the second housing are provided with a fastening member for fastening the housings together. The sealing material of the first housing and the sealing material of the second housing include an extending portion extending in the axial direction of the flow path forming member and the annular seal extending in the circumferential direction of the flow path forming member. 4. The leak prevention device according to claim 1 , further comprising: a peripheral side portion that overlaps with the material, and a bridging portion that extends in a curved line across the extending portion and the peripheral side portion. A method for attaching a leak prevention tool for preventing leakage of an internal fluid from a flow path component having a sealed interior, comprising:
a first casing having a split structure in the circumferential direction and having a sealing material made of an elastic material on the inner periphery at positions sandwiching a fluid leakage point occurring on the outer surface of the flow path constituting member in the flow path direction; A second housing having a split structure in the circumferential direction and having a sealing material made of an elastic material on the periphery is fitted onto the flow path forming member, and both end surfaces of the second housing are adhered to each other to form an annular shape. , an annular sealing material made of an elastic material is fitted to the flow path forming member at a position between the first housing and the second housing;
By drawing the first housing and the second housing together, the annular sealing material is moved to the flow path between the sealing material of the first housing and the sealing material of the second housing. arranged so as to be positioned on the inner diameter side in the radial direction of the component member and overlapped,
By sealingly fastening the first housing to the flow path forming member and sealingly fastening the second housing to the flow path forming member, the annular seal member is pressed inwardly. A method of installing a leakage prevention tool, characterized by:

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