JP7118505B2 - stop current plug - Google Patents

Description

The present invention relates to a flow stop plug. In particular, the present invention relates to a flow stop plug used as a flow stop device for temporarily blocking the inside of a water pipe during repair or replacement work that involves cutting a water pipe.

Conventionally, when repairing or replacing the middle part of a water pipe, or when connecting a new branch pipe to the middle part, a stop has been used to temporarily shut off the water inside the water pipe. Flow plugs are known (eg, US Pat. For example, as shown in the enlarged cross-sectional view of the main part of FIG. and an exterior bag 103 that encloses the interior bag 102 for protection. It is configured by being connected systematically.

For example, as shown in the state of use diagram of FIG. A flow stop plug 100 in a contracted state is arranged in the flow stop plug 100, and air or water is supplied into the flow stop plug 100 from a fluid supply/discharge pipe D connected to the mouthpiece 101 of the flow stop plug 100 to expand the flow stop plug 100. Let used. Due to the expansion of the stop plug 100, the water in the water pipe A is cut off, making it possible to repair or replace the middle part of the water pipe A.

Japanese Patent Application Laid-Open No. 2001-241590

However, in conventional flow stop plugs, since the binding force of the crimping ring is weak, the openings of the exterior bag and the interior bag are partly pulled out from the crimping ring as the flow stop plug expands. However, there is a problem that positional deviation occurs. If such a situation occurs, the flow stoppage performance of the flow stop plug deteriorates, and the outer bag fails to exert its function of regulating the expansion of the inner bag and protecting it.

Also, in order to increase the binding force of the crimping ring, as shown in the enlarged cross-sectional view of the main part of FIG. A flow stop plug 100 having a structure in which the mouth of 103 is fixed to a mouthpiece 104 is also known. When the flow stop plug 100 is turned about 90° and inserted into the water pipe A through the flow stop plug insertion hole B drilled in A, the long mouthpiece 101 is inserted into the flow stop plug insertion hole C. There was a problem that it interfered with the exit part and could not be inserted smoothly. In particular, when trying to insert the stop plug 100 into a water pipe having a relatively small inner diameter, the insertion itself may not be possible in some cases, resulting in a lack of versatility.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a highly versatile flow stop plug that exhibits high flow stop performance.

The above-mentioned object of the present invention is to provide an inflatable and expandable inner bag having a rigid cylindrical mouthpiece protruding from one end that can be connected to a fluid supply/discharge pipe for supplying/discharging fluid, and expansion regulation and protection of the inner bag. A flow stop plug comprising an outer bag that encloses the inner bag for use as a flow stop plug, and a crimping ring that fits and crimps the mouthpiece through the mouth of the outer bag, wherein the inner peripheral surface of the crimping ring is formed with a protruding portion protruding toward the inside of the crimping ring, and the mouthpiece includes a cylindrical mouthpiece body having an internal through hole penetrating from one end to the other end, and the mouthpiece body and a reinforcing member formed of an elastic material, the reinforcing member being interposed between the mouthpiece main body and the internal bag. A member adhered and fixed to the mouthpiece body and the interior bag, comprising: a covering portion arranged to surround and cover the outer peripheral surface of the mouthpiece body; and a taper whose diameter increases toward the other end of the mouthpiece body. At least part of the enlarged diameter portion is embedded in the tapered portion, and the crimping ring includes the covering portion of the reinforcing member, the mouth of the inner bag, and the outer bag. This is achieved by a flow stop plug externally fitted and crimped to the mouthpiece body via a layered portion with the mouth of the mouthpiece .

In this way, by providing a protruding portion that protrudes toward the inside of the crimping ring on the inner peripheral surface of the crimping ring, the protruding portion will bite into the exterior bag interposed between the crimping ring and the mouthpiece. It is possible to effectively prevent the positional displacement of the bag. Furthermore, since the exterior bag is fixed to the mouthpiece using a single crimping ring, the mouthpiece can be prevented from becoming long. As a result, when the flow stop plug is inserted into the water pipe through the flow stop plug insertion hole drilled in the water pipe, the mouthpiece interferes with the exit portion of the flow stop plug insertion hole. For example, even when trying to insert a flow stop plug into a water pipe with a relatively small inner diameter, it is possible to smoothly insert it, making it extremely versatile become highly sensitive.

Moreover, in this flow stop plug, it is preferable that the projecting portion is formed in an annular shape along the circumferential direction of the crimping ring. By adopting such a configuration, even if a force is generated to pull out the mouth of the exterior bag from the crimping ring as the flow stop plug expands, it is possible to provide the exterior bag with strong resistance against this force. This makes it possible to more effectively prevent the outer bag from being dislocated.

Moreover, it is preferable that a plurality of the annular protrusions are formed at predetermined intervals along the axial direction of the crimping ring, and grooves are formed between the annular protrusions. With such a configuration, the crimping ring tightly binds the mouth of the exterior bag in a state in which a part of the mouth portion of the exterior bag enters the groove formed between the projecting portions, and as a result, the crimping ring To extremely effectively prevent positional deviation of an exterior bag by imparting extremely strong resistance force to the exterior bag even if a force to pull out the mouth of the exterior bag is generated from the outer bag. becomes possible.

Moreover, in a cross-sectional view along the axial direction of the crimping ring, it is preferable that the groove is formed such that the width of the opening on the center direction side of the crimping ring is wider than the width of the groove bottom. Here, it is preferable that the width of the opening is set to be two to four times the width of the bottom of the groove. By adopting such a configuration, it is possible to increase the area of the mouth portion of the outer bag that is allowed to enter the groove formed between the protruding portions when crimping the crimping ring. It is possible to increase the contact area between the inner peripheral surface of the crimping ring and the outer surface of the exterior bag, and it is possible to generate a greater resistance against the force that tries to pull out the mouth of the exterior bag from the crimping ring. Displacement of the bag can be effectively prevented.

Further, in a cross-sectional view along the axial direction of the crimping ring, each of the protrusions includes a pair of side surfaces extending from the groove bottom toward the inner side of the crimping ring, and the pair of side surfaces of the crimping ring. and a tip portion connecting the inner ends, and the tip portion preferably has a flat portion along the axial direction of the crimping ring. With such a configuration, when the crimping ring is crimped, the groove formed between the side surface of one protrusion and the side surface of the protrusion adjacent to this one protrusion is fitted to the mouth portion of the outer bag. By entering the predetermined area of the outer bag, it is possible to effectively prevent the outer bag from being displaced and to effectively suppress the tip of the projecting portion from breaking through the outer bag.

Further, a protruding chamfered portion connected to the flat portion may be formed at a connecting portion between the tip portion and each side portion. By providing such a protruding chamfered portion, it is possible to further increase the contact area between the inner peripheral surface of the crimping ring and the outer surface of the exterior bag. As a result, it becomes possible to generate a stronger resistance force, and it is possible to extremely effectively prevent the positional deviation of the exterior bag.

Also, a chamfered portion may be formed at a corner on the inner peripheral surface side of the opening of the crimping ring. By providing such a chamfered portion, it is possible to effectively prevent damage to the surface portion of the exterior bag that contacts the opening.

Further, the inner peripheral surface of the opening of the crimping ring may be formed in a tapered shape that gradually increases in diameter toward the outer side in the axial direction of the crimping ring. Even with such a configuration, it is possible to effectively prevent the surface portion of the exterior bag from being damaged in contact with the opening.

ADVANTAGE OF THE INVENTION According to this invention, while demonstrating high flow stop performance, a flow stop plug with high versatility can be provided.

1 is a plan view of a schematic configuration of a current stop plug according to the present invention; FIG. FIG. 2 is an enlarged cross-sectional view of a main part of the schematic configuration of the current stop plug shown in FIG. 1; (a) is a plan view of a crimping ring included in the current stop plug according to the present invention, and (b) is a sectional view showing the AA section. FIG. 4 is an enlarged view of a main portion of FIG. 3; FIG. 4 is an explanatory diagram for explaining a stepped portion that can be formed on the surface of the exterior bag; 1. It is a perspective view for demonstrating the modification of the current stop plug shown in FIG. It is an explanatory view for explaining a modification of a current stop plug shown in Drawing 1. FIG. 3 is an enlarged cross-sectional view of a main part of the schematic structure showing a modification of the crimping ring of the flow stop plug shown in FIG. 1 ; FIG. 3 is an enlarged cross-sectional view of a main part of the schematic structure showing a modification of the crimping ring of the flow stop plug shown in FIG. 1 ; 1. It is schematic structure sectional drawing which shows the modification of the crimping ring which the flow stop plug shown in FIG. 1 has. 1. It is schematic structure sectional drawing which shows the modification of the crimping ring which the flow stop plug shown in FIG. 1 has. 1. It is (a) top view regarding the modification of the stop-flow plug shown in FIG. 1, (b) sectional drawing. FIG. 3 is a cross-sectional view showing a modification of the current stop plug shown in FIG. 1; FIG. 14 is a cross-sectional view of a mouthpiece portion showing a modification of the flow stop plug shown in FIG. 13; FIG. 10 is an enlarged cross-sectional view of a main portion of a conventional current stop plug; FIG. 4 is a diagram showing the state of use of the current stop plug. FIG. 5 is an enlarged cross-sectional view of a main part of a current stop plug having another conventional configuration.

A flow stop plug according to the present invention will be described below with reference to the accompanying drawings. Each figure is partially enlarged/reduced to facilitate understanding of the configuration. FIG. 1 is a schematic configuration plan view showing an inflated state of a flow stop plug 1 according to the present invention, and FIG. 2 is an enlarged cross-sectional view of the schematic configuration essential parts. This stop plug 1 is used to temporarily cut off the water inside the water pipe when repairing or replacing the middle part of the water pipe or when connecting a new branch pipe to the middle part. As described in the background art, a flow stop device B attached to the water pipe A is inserted into the water pipe A through a flow stop plug insertion hole C drilled in the water pipe A into a contracted state. A certain flow stop plug 1 is disposed, and gas or liquid such as air or water or a mixture thereof is supplied into the flow stop plug 1 from a fluid supply/discharge pipe D connected to the mouthpiece 21 of the flow stop plug 1, and the flow stop plug 1 is supplied to the flow stop plug 1. It is used by inflating the plug 1. In this embodiment, the case where the tap water in the water pipe is stopped (water stopped) will be described as an example, but the fluid in the pipe to stop the flow is not limited to tap water. It may be gas or liquid such as industrial water or sewage, or a mixture thereof.

A flow stop plug 1 according to the present invention comprises an inner bag 2 and an outer bag 3, as shown in FIGS. The inner bag 2 has an expandable/contractible structure in which a rigid cylindrical mouthpiece 21 that can be connected to a fluid supply/discharge pipe D for supplying/discharging fluid is protruded from one end. is disposed so as to cover the inner bag 2 for regulating the expansion of the inner bag 2 and protecting it.

The inner bag 2 is made of a rubber material having airtightness and flexibility, and is formed in the shape of a spheroid having a long axis and a short axis of a predetermined length. Examples of rubber materials include natural rubber, butadiene rubber, isoprene rubber, butyl rubber, ethylene-propylene rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, acrylic rubber, and epichlorohydrin rubber. The interior bag 2 may be made of an elastomer such as polyurethane, a cloth material, or a rubberized cloth.

The mouthpiece 21 is a member having one end connectable to a fluid supply/discharge pipe D for supplying/discharging fluid, and is an opening (a mouth formed in a cylindrical shape) provided at one end of the longitudinal axis of the interior bag 2 . It is bonded (vulcanized) and integrated with the inner bag 2 so as to close the . As shown in the cross-sectional view of FIG. 2, the mouthpiece 21 has a cylindrical mouthpiece body 21a having an internal through hole 21d penetrating from one end to the other end.

The mouthpiece main body 21a is made of, for example, a metal material such as stainless steel or a resin material such as plastic, and is configured to have rigidity. The mouthpiece main body 21a has a first enlarged diameter portion 21b whose diameter is enlarged radially outward from the outer surface of one end, and a second enlarged diameter portion 21c whose diameter is enlarged radially outward from the outer peripheral surface of the other end. It has The first enlarged diameter portion 21b is arranged on one end side of the mouthpiece main body 21a and is exposed to the outside, and the second enlarged diameter portion 21c is arranged on the other end side of the mouthpiece body 21a and is inside the inner bag 2. placed in The first enlarged diameter portion 21b and the second enlarged diameter portion 21c have a function of retaining the crimping ring. The first enlarged diameter portion 21b is configured to be flush with the end surface of one end of the mouthpiece body 21a. It is configured to be flush. In the inner peripheral surface of the internal through hole 21d formed in the mouthpiece main body 21a, a female thread is formed on one end side (the side where the first enlarged diameter portion 21b is formed), and the fluid is passed through this female thread. The fluid supply/discharge pipe D is connected to the mouthpiece 21 (stop plug 1) by screwing the tip of the fluid supply/discharge pipe D for supply/discharge, and the fluid supply/discharge pipe D is connected via the internal through hole 21d. The inner bag 2 is inflated by the action of the fluid (air, water, etc.) supplied from the .

Here, when forming the interior bag 2, reinforcing fibers may be contained in the rubber material or the elastomer such as polyurethane. By containing such reinforcing fibers, the strength of the inner bag 2 can be increased, and deterioration of the inner bag 2 when crimped by a crimping ring 4 described later can be effectively suppressed. becomes. Examples of reinforcing fibers include carbon fibers, aramid fibers, glass fibers, boron fibers, silicon carbide fibers, and alumina fibers. As for the form of the contained reinforcing fibers, it is preferable to use short fibers. Also, the content ratio of the reinforcing fibers to the elastomer is appropriately selected depending on the design specifications.

The exterior bag 3 is a member arranged to cover the interior bag 2 to prevent the interior bag 2 from expanding and protect it. Excessive expansion of the inner bag 2 is restricted by this outer bag, and the shape of the inner bag 2 is maintained at the time of expansion, and the inner bag 2 is protected from projections that may cause damage, rupture, or the like. The outer bag 3 is tightly fixed by a crimping ring 4 at the mouth of the outer bag 3 corresponding to a mouthpiece 21 provided at the mouth of the inner bag 2 with the inner bag 2 accommodated inside.

The caulking ring 4 pulls out a predetermined length of the tip of the mouth of the outer bag 3 toward the first enlarged diameter portion 21b of the mouthpiece 21, and the mouthpiece 21 (mouthpiece main body 21a) is pulled out through the mouth of the exterior bag 3. It is a member to be fitted and crimped. The crimping ring 4 is arranged between the first enlarged diameter portion 21b and the second enlarged diameter portion 21c of the mouthpiece main body 21a and is externally fitted and crimped. The crimping ring 4 is made of a metal such as lead, tin, aluminum, copper, stainless steel, or a resin such as plastic, and is formed in an annular shape so that it can be contracted and deformed by using a crimping tool or the like. be.

On the inner peripheral surface of the crimping ring 4, a cross-sectional view of FIG. As shown, a protruding portion 41 protruding toward the inner side of the crimping ring 4 is formed. In this embodiment, the protrusions 41 are formed in an annular shape along the circumferential direction of the crimping ring 4 , and the annular protrusions 41 are spaced apart from each other along the axial direction of the crimping ring 4 . Multiple are placed. In addition, grooves 42 are formed between the protrusions 41 , and a plurality of grooves 42 are also arranged along the axial direction of the crimping ring 4 .

Further, as shown in FIG. 4, which is an enlarged view of the main part of FIG. 3, in a cross-sectional view along the axial direction of the crimping ring 4, the opening width W1 of the groove portion 42 on the side of the center direction of the crimping ring is equal to that of the groove bottom portion 42a. It is formed so as to be wider than the width W2. The dimension of the opening width W1 is preferably set within a range of two to four times the dimension of the width W2 of the groove bottom portion 42a. In this embodiment, the dimension of the opening width W1 is three times the dimension of the width W2 of the groove bottom portion 42a.

3 and 4, in a cross-sectional view along the axial direction of the crimping ring 4, each protruding portion 41 has a pair of side surfaces extending inwardly of the crimping ring 4 from the groove bottom portion 42a of the groove portion 42. It is configured to include a portion 41a and a tip portion 41b that connects the inner ends of the crimping ring 4 of the pair of side surface portions 41a. Further, the tip portion 41b is configured to have a flat portion 41c along the axial direction of the crimping ring 4 so as not to be sharp. Also, the tip portion 41b may have a spherical surface so as not to be sharp, or may have a shape that connects curved surfaces. In addition, the pair of side surface portions 41a are configured as inclined surfaces such that the distance between them decreases toward the inside of the crimping ring 4, and in a cross-sectional view along the axial direction of the crimping ring 4, each projecting portion 41 is configured as a trapezoidal shape. It should be noted that the tip portion 41 b of the projecting portion 41 forms the innermost peripheral surface of the crimping ring 4 , although it does not need to be explained. Moreover, the side surface portion 41 a of the projecting portion 41 is configured as the side wall portion 42 b of the groove portion 42 . Here, the height W3 of the protruding portion 41 (the height from the groove bottom 42a to the tip 41b) is set in the range of 1 to 3 times the dimension of the width W2 of the groove bottom 42a. is preferred. In this embodiment, the height W3 of the projecting portion 41 is configured to be 1.5 times the dimension of the width W2 of the groove portion 42 .

Here, the exterior bag 3 is preferably made of a fabric material having high tensile strength, low water permeability, and flexibility, such as an elastomer, a rubber-coated fabric, or the like. As for the thickness of the exterior bag 3, for example, it is preferable to use one in the range of 0.1 mm to 0.7 mm, more preferably in the range of 0.15 mm to 0.55 mm. Further, when the exterior bag 3 is formed from a cloth material, the fiber material constituting the cloth material is not particularly limited, but is preferably composed of high-strength polyethylene fiber. The strength of the cloth material formed from high-strength polyethylene fibers is preferably in the range of 1.5 kN/3 cm to 8 kN/3 cm in both warp and weft, and 2.7 kN/3 cm to 6.7 kN/ It is even more preferred to use a range of 3 cm. In addition, the basis weight of the cloth material formed from high-strength polyethylene fibers is preferably in the range of 80 g/sqm to 300 g/sqm, more preferably in the range of 90 g/sqm to 250 g/sqm. is more preferred. The basis weight means the weight per 1 m ² . By constructing the exterior bag 3 using a cloth material formed from such high-strength polyethylene fibers, the thickness of the exterior bag 3 can be made relatively thin, for example, 0.1 mm to 0.7 mm. This makes it possible to obtain the exterior bag 3 that is highly flexible while maintaining the high tensile strength (strength) as described above.

As a method of forming the exterior bag 3, various methods such as a method of weaving various fiber materials into a bag shape, a method of sewing a sheet-like cloth material into a bag shape, and the like are adopted. However, for example, when a sheet-like cloth material is sewn into a bag, the cloth materials are overlapped with each other as shown in the schematic perspective view (partially shown in cross section) of FIG. A stepped portion 31 is formed at the edge of the sewn portion H so as to step down toward the cloth material 3a on the lower side. This stepped portion 31 may form a flow path through which water leaks between the inner wall of the water pipe and the surface of the exterior bag 3 when the flow stop plug 1 is expanded and used in the water pipe A. In particular, when the longitudinal direction of the stepped portion 31 is arranged in the water pipe A along the extending direction of the water pipe A, there is a high possibility that the flow blocking performance of the flow blocking plug 1 will deteriorate. put away. Therefore, as shown in the schematic perspective view of FIG. 6, the stepped portion 31 is provided with a stepped portion 6 having an inclined surface that slopes toward the lower cloth material 3a along the longitudinal direction. may be configured. The step relief portion 6 can be formed, for example, by applying and molding an adhesive such as epoxy or acrylic along the step portion 31 . Further, as shown in the schematic perspective view of FIG. 7(a), an elongated stepped relief portion 6 having an inclined surface is prepared in advance using an elastomer material such as rubber, and is attached to the stepped portion 31 via an adhesive. It can be fixed along Further, as shown in the schematic perspective view of FIG. 7(b), a flat insertion portion 6a is connected to a long step-difference alleviating portion 6 having an inclined surface made of an elastomer material, As shown in the cross-sectional view of FIG. 7(c), before sewing, the inserting portion 6a is interposed between the upper and lower cloth materials to be sewn together and fixed with an adhesive or the like. The step relief portion 6 may be arranged along the step portion 31 by integrally sewing the insertion portion 6a and the upper cloth material 3b.

The operational effects of the current stop plug 1 according to the present invention will be described below. First, the flow stop plug 1 of the present invention is provided with a single crimping ring 4 for externally fitting and crimping the mouth of the exterior bag 3 . It is configured to provide a protrusion 41 that protrudes. With such a configuration, the protruding portion 41 bites into the outer bag interposed between the crimping ring 4 and the mouthpiece 21 (mouthpiece main body 21a). Even if a force acts to pull out the mouth of the exterior bag 3 from the crimped portion due to the expansion of the outer bag 3, it is possible to prevent the mouth of the exterior bag 3 from moving (displacement) and exhibit high flow stopping performance. Become. Furthermore, since the exterior bag 3 is fixed to the mouthpiece 21 using a single crimping ring 4, the mouthpiece 21 can be prevented from becoming long. As a result, when the flow stop plug 1 is inserted into the water pipe A through the flow stop plug insertion hole C drilled in the water pipe A, the direction of the flow stop plug 1 is changed by about 90° and the mouthpiece 21 is inserted into the flow stop plug insertion hole C. It is possible to effectively prevent interference with the outlet part of C, and for example, even when trying to insert the stop plug 1 into the water pipe A having a relatively small inner diameter, it can be inserted smoothly. It becomes possible to do so, and it becomes extremely versatile.

Further, in the flow stop plug 1 according to the above embodiment, the projecting portion 41 is formed in an annular shape along the circumferential direction of the crimping ring 4 . That is, since the protruding portion 41 is formed to extend in a direction substantially perpendicular to the direction of the force that pulls out the mouth of the outer bag 3 from the crimping ring 4 as the flow stop plug 1 expands, crimping does not occur. A strong resistance force is imparted to the exterior bag 3 against the force to pull out the mouth of the exterior bag 3 from the ring 4, and it is possible to more effectively prevent the positional deviation of the exterior bag 3 and the interior bag 4. becomes.

In the above embodiment, a plurality of annular protrusions 41 are formed at predetermined intervals along the axial direction of the crimping ring 4, and grooves 42 are formed between the annular protrusions 41. It is With such a configuration, the crimping ring 4 is positioned at the mouth of the exterior bag 3 in a state in which a portion of the mouth portion of the exterior bag 3 enters (in a state of being accommodated in) the groove 42 formed between the projecting portions 41 . As a result, even if a force is generated to pull out the mouth of the exterior bag 3 from the crimping ring 4, the exterior bag 3 and the interior bag 4 are given extremely strong resistance against this force. , the outer bag 3 and the like can be prevented from being displaced very effectively.

Further, in the above-described embodiment, in a cross-sectional view along the axial direction of the crimping ring 4, the groove portion 42 is formed so that the opening width W1 on the center direction side of the crimping ring is wider than the width W2 of the groove bottom portion 42a. It is By adopting such a configuration, when crimping the crimping ring 4, it is possible to increase the area of the mouth portion of the exterior bag 3 that is allowed to enter the groove 42 formed between the projecting portions 41. Become. In other words, the contact area between the inner peripheral surface of the crimping ring 4 and the outer surface of the exterior bag 3 can be increased, and a greater resistance to the force that pulls the mouth of the exterior bag 3 out of the crimping ring 4 is generated. Therefore, it is possible to prevent the positional deviation of the external bag very effectively.

In the above-described embodiment, in a cross-sectional view along the axial direction of the crimping ring 4, each projecting portion 41 includes a pair of side surface portions 41a extending from the groove bottom portion 42a toward the inner side of the crimping ring 4, and the pair of side surface portions 41a. A front end portion 41 b that connects inner ends of the crimping ring 4 of the side surface portion 41 a is provided. With such a configuration, when the crimping ring 4 is crimped, the groove portion 42 is formed between the side surface portion 41a of one projection portion 41 and the side surface portion 41a of the projection portion 41 adjacent to the one projection portion 41. In addition, the tip portion 41b of the projecting portion 41 penetrates the outer bag 3 and the lower part of the outer bag 3 while effectively preventing the positional deviation of the outer bag by entering a predetermined area of the mouth portion of the outer bag 3. It is possible to effectively suppress damage to the inner bag 2 located in the

Here, when the exterior bag 3 is made of a relatively thin cloth material with a thickness in the range of 0.1 mm to 0.7 mm, the exterior bag 3 can be formed with high flexibility. As a result, when the caulking ring 4 is deformed to reduce its diameter by crimping, the mouth portion of the exterior bag 3 also moves following the diameter reduction, and the predetermined region of the mouth portion of the exterior bag 3 moves inside the groove portion 42 . In this state, the external bag 3 can be tightly bound and fixed by the crimping ring 4. As a result, it is possible to prevent the positional deviation of the exterior bag extremely effectively. In addition, since the exterior bag 3 has high flexibility, the exterior bag 3 easily follows the expansion of the diameter of the interior bag 2 that is inflated inside the water pipe A, and there is a gap between the exterior bag 3 and the inner wall of the water pipe A through which water leaks. It is possible to effectively suppress the formation of the layer, and to exhibit high flow stopping properties.

Although the current stop plug 1 according to one embodiment of the present invention has been described above, the specific configuration of the current stop plug 1 is not limited to the above embodiment. For example, in the above-described embodiment, as shown in the enlarged cross-sectional view of the main part of the schematic configuration of FIG. It may be configured to form a protruding portion chamfered portion 41d. By providing such a protruding chamfered portion 41d, it is possible to further increase the contact area between the inner peripheral surface of the crimping ring 4 and the outer surface of the exterior bag. It is possible to generate a stronger resistance force against the force applied, and it is possible to prevent the positional deviation of the exterior bag 3 very effectively.

Further, in the above-described embodiment, the protrusion 41 is configured to have an annular shape formed along the circumferential direction of the crimping ring 4, but is not particularly limited to such a configuration. A plurality of hemispheres may be arranged on the inner peripheral surface of the crimping ring at predetermined intervals. The protruding portions 41 may be configured as protrusions having a shape or a prism shape, and may be configured so as to be annularly or dispersedly arranged on the inner peripheral surface of the crimping ring 4 .

Further, in the above-described embodiment, a plurality of annular protruding portions 41 are formed along the circumferential direction of the crimping ring 4, but are not limited to such a form. The crimping ring 4 may be configured by providing one annular protrusion 41 .

Further, in the above-described embodiment, each annular projecting portion 41 is crimped from the groove bottom portion 42a of the groove portion 42 in a cross-sectional view along the axial direction of the crimping ring 4, as shown in the cross-sectional views of FIGS. A pair of side surface portions 41a extending toward the inner side of the ring 4 are provided, and the pair of side surface portions 41a are configured as inclined surfaces such that the distance between them decreases toward the inside of the crimping ring 4. However, it is not particularly limited to such a configuration. For example, as shown in the cross-sectional view of FIG. The width W1 of the opening inside the crimping ring in the groove 42 may be the same as the width W2 of the groove bottom 42a. Further, as shown in the cross-sectional view of FIG. 9B, the structure shown in FIG. 9A may be configured by forming the chamfered portion 41d of the projecting portion.

In addition, in the current stop plug 1 according to the present embodiment, as shown in the schematic configuration cross-sectional view of FIG. It may be configured to provide a chamfer 45 that is formed. As a specific example of the chamfer 45, for example, R chamfering is preferable, but C chamfering may be adopted. Here, when the flow stop bag 1 expands due to the action of the fluid (air, water, etc.) supplied from the fluid supply/discharge pipe D, a part of the surface of the outer bag 3 becomes the inner peripheral surface of the opening of the crimping ring 4. (particularly, a corner on the inner peripheral surface side of the opening of the crimping ring 4 arranged on the side of the second enlarged diameter portion 21c of the mouthpiece main body 21a). However, by forming the chamfered portion 45 as described above, the surface of the exterior bag 3 is aligned with the opening of the crimping ring 4. It is possible to effectively prevent damage caused by the corners on the inner peripheral surface side. One end of the chamfered portion 45 (the end located on the side opposite to the opening edge side of the crimping ring 4) rises from the ring-shaped protruding portion 41 disposed closest to both end openings of the crimping ring 4. It is more preferable to connect to the starting point of the . By adopting such a configuration, it is possible to more effectively prevent the exterior bag 3 from being damaged due to contact with the opening of the crimping ring 4 . Note that the chamfered portions 45 may be formed only in the openings arranged on the side of the second enlarged diameter portion 21c of the base body 21a instead of being formed in each of the openings at both ends of the crimping ring 4. .

Further, in the flow stop plug 1 according to the present embodiment, as shown in the schematic cross-sectional view of FIG. It may be configured to have a tapered shape that gradually expands in diameter. By adopting such a configuration, it is possible to effectively prevent a part of the surface of the exterior bag 3 from being damaged by the corner portion on the inner peripheral surface side of the opening of the crimping ring 4 . In particular, by further forming the chamfered portion 45 described above, it is possible to more effectively prevent the surface of the exterior bag 3 from being damaged by the opening of the crimping ring 4 . As shown in FIG. 11, instead of forming the inner peripheral surfaces of the openings at both ends of the crimping ring 4 in a tapered shape that gradually increases in diameter, the second enlarged diameter portion of the mouthpiece main body 21a Only the inner peripheral surface of the opening arranged on the 21c side may be tapered. Here, the tapered inner peripheral surface 46 of the opening of the crimping ring 4 may be formed, for example, by performing machining such as cutting on each opening when manufacturing the crimping ring 4. can be done. Also, when crimping the crimping ring 4 (for example, the crimping ring 4 having the form shown in FIG. 3) where the tapered inner peripheral surface 46 is not formed, the area excluding the opening area of the crimping ring 4 (Axial central region of the crimping ring 4) can also be formed by diameter-contracting deformation using a crimping tool.

Further, in the current stop plug 1 according to the present embodiment, as shown in the plan view of FIG. 12(a) and the cross-sectional view of FIG. A plurality of strip-shaped thick portions 7 may be formed along the longitudinal direction of the long spherical portion of the interior bag 2 . As shown in the cross-sectional view of FIG. 12(b), the strip-shaped thick portions 7 are preferably arranged at approximately equal intervals along the circumferential direction of the inner bag 2. As shown in FIG. By forming such a thick portion 7, it is possible to effectively prevent the interior bag 2 from being excessively inflated.

Further, in the present embodiment, the second enlarged diameter portion 21c is formed in a ring shape along the circumferential direction of the mouthpiece body 21a, but is not limited to such a configuration. It may be configured to have a plurality of dot-shaped second enlarged diameter portions 21c that partially protrude on the outer surface. In addition, the dot-shaped second enlarged diameter portion 21c does not need to be plural, and may be single.

Further, regarding the above-described embodiment, as shown in the cross-sectional view of FIG. The reinforcing member 8 is a member that is interposed between the mouthpiece body 21a and the interior bag 3 and is adhesively fixed to the mouthpiece body 21a and the interior bag 3 . The reinforcing member 8 is arranged to surround and cover at least a part of the outer peripheral surface of the mouthpiece body 21a, and has a tapered portion 81 whose diameter increases toward the other end side of the mouthpiece body 21a. As a material for forming the reinforcing member 8, for example, an elastic member such as a rubber material can be used. Examples of rubber materials include natural rubber, butadiene rubber, isoprene rubber, butyl rubber, ethylene-propylene rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, acrylic rubber, and epichlorohydrin rubber.

The method of providing the reinforcing member 8 as shown in FIG. 13 on the outer peripheral surface of the mouthpiece main body 21a is not particularly limited. A method of using a mold and injecting a predetermined material into the internal space of the mold can be adopted. Moreover, in order to improve the adhesiveness between the base body 21a and the reinforcing member 8, it is preferable that the base body 21a and the reinforcing member 8 are fixed to each other by vulcanization adhesion.

Further, in the mouthpiece 21 shown in FIG. 13, the other end of the mouthpiece main body 21a and the second enlarged diameter portion 21c provided at the other end are configured to be embedded in the tapered portion 81 of the reinforcing member 8. . That is, the entire area of the other end side of the mouthpiece main body 21 a is configured to be buried inside the tapered portion 81 of the reinforcing member 8 . Further, the tapered portion 81 of the reinforcing member 8 is formed with a communication passage 82 that communicates with the internal through hole 21d of the mouthpiece main body 21a. The communication path 82 opens toward the inside of the interior bag 2, thereby allowing the fluid (air, water, etc.) supplied from the fluid supply/discharge pipe D through the internal through-hole 21d and the communication path 82 to flow. Due to this action, the inner bag 2 is inflated.

In order to adhere and fix the mouthpiece 21 having such a structure to the opening (mouth) provided at one end of the long axis of the interior bag 2, for example, a part of the interior bag 2 is cut open, and the mouthpiece 21 is removed through the cut hole. This can be done by entering the interior bag 2 and inserting the first enlarged diameter portion 21b side of the base 21 from the inside of the interior bag 2 toward the opening (mouth). After the mouthpiece 21 is protruded from the opening (mouth) of the inner bag 2, a closing member such as a band-shaped rubber piece is overlapped and adhered to the cut hole to close the cut hole. can do. In addition, in order to improve the adhesiveness between the reinforcing member 8 of the base 21 and the opening of the inner bag 2 and the adhesiveness between the inner bag 2 and the rubber piece for closing the cut hole, the reinforcing member 8 and the inner It is preferable that the opening of the bag 2, the inner bag 2 and the rubber piece for closing the cut hole are adhered and fixed to each other by vulcanization adhesion.

Thus, by adopting a configuration in which the mouthpiece 21 has the tapered portion 81 whose diameter increases toward the other end of the mouthpiece main body 21a, the adhesion area between the inner bag 2 and the mouthpiece 21 is larger than that of the conventional structure. As a result, the inner bag 2 and the mouthpiece 21 are firmly adhered and fixed, and as a result, the adhesion strength of the inner bag 2 to the mouthpiece 21 that may occur as the flow stop plug 1 is continued to be used. The reduction can be effectively prevented, and part or the whole of the mouth of the inner bag 2 can be effectively prevented from being separated from the mouthpiece 21 and coming out of the crimped portion.

Further, the flow stop plug 1 according to the present embodiment is configured such that the mouthpiece main body 21a is provided with the second enlarged diameter portion 21c projecting radially outward from the outer peripheral surface of the other end portion. Since the second enlarged diameter portion 21c also functions as a stopper for the reinforcing member 8, it is possible to effectively prevent the reinforcing member 8 from being pulled out toward the other end of the mouthpiece main body 21a. becomes possible.

Further, when the other end of the mouthpiece main body 21a and the second enlarged diameter portion 21c are embedded in the tapered portion 81 of the reinforcing member 8, the entire area of the other end side of the mouthpiece body 21a is the reinforcing member 8. Since it is embedded inside the tapered portion 81, the contact area between the base 21 and the reinforcing member 8 can be further increased. It is possible to further improve the function of the enlarged diameter portion 21c as a stopper. In addition, it is possible to effectively prevent the reinforcing member 8 from being pulled out to the other end side of the mouthpiece body 21a and from being displaced to the one end side of the mouthpiece body 21a.

13, the entire area of the other end of the mouthpiece body 21a is buried inside the tapered portion 81 of the reinforcing member 8, so that the other end of the mouthpiece body 21a The end and the second enlarged diameter portion 21c are arranged inside the tapered portion 81 of the reinforcing member 8. For example, as shown in the cross-sectional view of FIG. At least a portion of the second enlarged diameter portion 21 c provided at the other end portion may be embedded in the tapered portion 81 of the reinforcing member 8 . Even with such a configuration, the contact area between the mouthpiece body 21a and the reinforcement member 8 increases compared to the case where the reinforcement member 8 is not provided, so the bonding strength between the mouthpiece body 21a and the reinforcement member 8 is improved. becomes possible. In addition, since the function of the second enlarged diameter portion 21c as a stopper is maintained, it is possible to prevent the reinforcing member 8 from being pulled out toward the other end of the mouthpiece main body 21a.

Further, the second enlarged diameter portion 21c is configured to be flush with the end surface of the other end of the mouthpiece main body 21a, but is not particularly limited to such a configuration. As shown in the cross-sectional view of FIG. 14(b), a second enlarged diameter portion 21c is formed on the outer peripheral surface of the other end of the mouthpiece body 21a while leaving a predetermined gap from the other end of the mouthpiece body 21a. The tapered portion 81 of the reinforcing member 8 may be formed so as to bury the entire second enlarged diameter portion 21c.

Moreover, it is preferable that the reinforcing member 8 is vulcanized while overlapping the thick portion 7 . For example, by extending the thick portion 7 to the tapered portion 81 of the reinforcing member 8 and vulcanizing the tapered portion 81 or the reinforcing member 8 from above, the strength of the inner bag 2 can be increased, and the reinforcing member 8 can be , it is possible to effectively prevent the cap body 21a from being pulled out to the other end side and the positional displacement to the one end side of the cap body 21a. However, the configuration is not limited to such a configuration, and the reinforcing member 8 and the thick portion 7 may be separated from each other.

1 stop plug 2 inner bag 21 cap 3 outer bag 4 crimping ring 41 projection 41a side surface 41b tip 41c flat portion 41d projection chamfered portion 42 groove 42a groove bottom 42b side wall 45 chamfered portion 46 opening of crimping ring Tapered inner peripheral surface 6 Step reduction portion 7 Thick portion 8 Reinforcing member 81 Tapered portion

Claims (9)

An inflatable and expandable inner bag having a rigid cylindrical mouthpiece protruding from one end that can be connected to a fluid supply and discharge pipe for supplying and discharging fluid, and a cover covering the inner bag for controlling and protecting the expansion of the inner bag. A current stop plug comprising an outer bag enclosing
A crimping ring is provided for externally fitting and crimping the mouthpiece through the mouth of the exterior bag,
A protrusion projecting toward the inside of the crimping ring is formed on the inner peripheral surface of the crimping ring ,
The mouthpiece includes a cylindrical mouthpiece body having an internal through hole penetrating from one end to the other end, an enlarged diameter portion expanding radially outward from the outer peripheral surface of the other end side of the mouthpiece body, a reinforcing member formed from a material;
The reinforcing member is a member that is interposed between the mouthpiece body and the interior bag, is adhered and fixed to the mouthpiece body and the interior bag, and is a covering portion that surrounds and covers the outer peripheral surface of the mouthpiece body. and a tapered portion whose diameter increases toward the other end of the mouthpiece body,
At least part of the enlarged diameter portion is embedded in the tapered portion,
The crimping ring is a flow stop plug externally fitted and press-fitted to the mouthpiece body via the laminated portion of the covering portion of the reinforcing member, the mouth of the interior bag, and the mouth of the exterior bag . 2. The current stop plug according to claim 1, wherein the projecting portion is annularly formed along the circumferential direction of the crimping ring. 3. The stop according to claim 2, wherein a plurality of said annular projections are formed at predetermined intervals along the axial direction of said crimping ring, and grooves are formed between said annular projections. flow plug. 4. The stop according to claim 3, wherein in a cross-sectional view along the axial direction of the crimping ring, the groove portion is formed so that the opening width on the center direction side of the crimping ring is wider than the width of the groove bottom portion. flow plug. 5. The current stop plug according to claim 4, wherein the opening width is two to four times the width of the groove bottom. In a cross-sectional view along the axial direction of the crimping ring, each of the protrusions includes a pair of side surfaces extending from the groove bottom toward the inside of the crimping ring, and a pair of side surfaces extending toward the inside of the crimping ring. 6. The current stop plug according to any one of claims 3 to 5, further comprising a tip portion connecting the ends, the tip portion having a flat portion along the axial direction of the crimping ring. 7. The current stop plug according to claim 6, wherein a protruding portion chamfered portion connected to the flat portion is formed at a connecting portion between the tip portion and each of the side portions. The current stop plug according to any one of claims 1 to 7, wherein a chamfered portion is formed at a corner portion on the inner peripheral surface side of the opening portion of the crimping ring. 9. The stop plug according to claim 1, wherein the inner peripheral surface of the opening of the crimping ring is tapered so that the diameter of the crimping ring gradually increases toward the outside in the axial direction of the crimping ring.

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