JP6917610B2 - Fluid pipe detachment prevention device - Google Patents

Description

The present invention relates to a fluid pipe detachment prevention device used for a pipe joint formed by inserting an insertion port of the other fluid pipe into a socket of one fluid pipe.

Patent Document 1 describes a push ring as a device for preventing the fluid pipe from coming off. The push ring includes an annular housing mounted on the outer periphery of the insertion slot and a retaining member having a claw portion that can bite into the outer peripheral surface of the insertion slot. The housing has an accommodating recess that opens toward the inner peripheral side, and a plurality of retaining members are accommodated in the accommodating recess. By making the claw portion of the retaining member bite into the outer peripheral surface of the insertion port, it is possible to exert a function of preventing the insertion opening from coming off from the receiving port, that is, a detachment prevention function.

When the anticorrosive film formed on the outer peripheral surface of the insertion port is peeled off by the bite of the nail part and the exposed metal part around the nail part is corroded, the bite action of the nail part is weakened and the detachment prevention function is provided for a long period of time. Can't be maintained. Therefore, in the push ring described in Patent Document 1, an elastic seal member is adhered or fixed to the surface of the claw portion in order to enhance the anticorrosion effect around the claw portion of the retaining member, and the elastic seal member is embedded in the exposed metal portion in the soil. Water is prevented from entering. Patent Documents 2 and 3 also describe similar retaining members.

However, the above-mentioned retaining member has poor versatility because the elastic sealing member is integrally adhered or fixed, and is difficult to use in a situation where the elastic sealing member is not required. In addition, if the elastic seal member deteriorates over time and becomes unusable due to circumstances such as storing the retaining member before use in a warehouse for a long period of time, even the retaining member to which it is adhered or fixed is adhered. Is wasted, or complicated work is required to remove the elastic sealing member from the retaining member, so that it cannot be said that the convenience is excellent.

Japanese Unexamined Patent Publication No. 2000-304177 Japanese Unexamined Patent Publication No. 2013-164107 Japanese Unexamined Patent Publication No. 2013-167329

The present invention has been made in view of the above circumstances, and an object of the present invention is to enhance the anticorrosion effect around the claw portion of the retaining member, and to separate the fluid pipe having excellent versatility and convenience of the retaining member. The purpose is to provide a preventive device.

The fluid pipe detachment prevention device according to the present invention is a fluid pipe detachment prevention device used for a pipe joint formed by inserting an insertion port of the other fluid pipe into a socket of one fluid pipe. Is composed of an annular body formed separately or integrally, and has a housing having a storage recess that opens toward the inner peripheral side, and a claw portion that can bite into the outer peripheral surface of the insertion slot, and the housing recess has a recess. It includes a housing retaining member and an elastic sheet mounted on the housing so as to cover the opening of the storage recess.

According to this configuration, when the claw portion of the retaining member is made to bite into the outer peripheral surface of the insertion slot, the elastic sheet covering the opening of the accommodating recess is cut by the claw portion, and the elastic sheet around the claw portion is inserted. It is pressed against the outer peripheral surface of the mouth. Therefore, even when the anticorrosion film is peeled off, water in the buried soil does not invade the exposed metal portion, and the anticorrosion effect around the nail portion is enhanced. Moreover, since the elastic sheet is attached to the housing, the retaining member is not wasted even if the elastic sheet becomes unusable, and there is no need to remove the elastic sheet from the retaining member. Excellent in versatility and convenience.

From the viewpoint of preventing the elastic sheet attached to the housing from easily falling off, it is preferable that both or one end of the elastic sheet is attached to the side surface of the housing. In that case, the end portion of the elastic sheet may be folded back in a hook shape, and the end portion may be hooked on the side surface of the housing. Alternatively or additionally, a recess may be provided on the side surface of the housing, and an fitting portion to be fitted into the recess may be formed at the end of the elastic sheet.

The elastic sheet may have annular seal protrusions formed to bulge toward the inner peripheral side or the front side in the insertion direction of the insertion slot at two locations in the pipe axial direction located across the accommodating recess. preferable. According to such a configuration, it is possible to effectively prevent water or the like from entering the exposed metal portion, and further enhance the anticorrosion effect around the claw portion of the retaining member.

The elastic sheet has a first region facing the claw portion of the retaining member and a pair of second regions facing the outer peripheral surface of the insertion slot and located across the first region. However, it is preferable that the thickness of the first region is smaller than the thickness of the second region. According to such a configuration, since the elastic sheet is easily cut by the claw portion, it becomes easy for the claw portion to bite into the outer peripheral surface of the insertion slot, and the detachment prevention function can be smoothly exhibited. Further, the second region easily adheres to the outer peripheral surface of the insertion port, which contributes to the improvement of the anticorrosion effect around the claw portion.

It is preferable that the inner peripheral surface of the elastic sheet has a corrugated cross-sectional shape. According to such a configuration, the outer peripheral surface of the insertion port and the elastic sheet are well sealed, and the anticorrosion effect around the claw portion can be enhanced.

Front view of the detachment prevention device (push wheel) according to the first embodiment of the present invention. A-O cross section of the push ring A-OB cross-sectional view of the push ring attached to the pipe joint Cross section of elastic sheet Cross-sectional view of the detachment prevention device (push ring) according to the second embodiment of the present invention. Cross-sectional view of the detachment prevention device (receptacle of the fluid pipe) according to the third embodiment of the present invention. Cross-sectional view of the detachment prevention device (reinforcing metal fitting) according to the fourth embodiment of the present invention.

The device for preventing the detachment of the fluid pipe according to the present invention includes, for example, a push ring in a mechanical type pipe joint (first and second embodiments), a socket of the fluid pipe in a slip-on type pipe joint (third embodiment), and the like. It can be applied to a reinforcing metal fitting (fourth embodiment) in a mechanical type or slip-on type pipe joint. Hereinafter, these application examples will be specifically described.

[First Embodiment]
The push ring 3 (an example of the detachment prevention device) shown in FIGS. 1 to 3 is used for a pipe joint formed by inserting the insertion port 2 of the other fluid pipe P2 into the receiving port 1 of one fluid pipe P1. The push ring 3 is made of an annular body formed separately from the receiving port 1, and has a housing 30 having an accommodating recess 31 that opens toward the inner peripheral side (inside in the pipe radial direction) and bites into the outer peripheral surface of the insertion port 2. It has a possible claw portion 51, and includes a retaining member 5 housed in the housing recess 31 and an elastic sheet 6 mounted on the housing 30 so as to cover the opening of the housing recess 31. Further, the push ring 3 includes a push bolt 52 as a pressing member that presses the retaining member 5 toward the inner peripheral side.

The fluid pipes P1 and P2 are ductile cast iron pipes for water supply that are buried underground, respectively. However, the present invention is not limited to this, and for example, a steel pipe, a vinyl chloride pipe, a polyethylene pipe, a polyolefin pipe, or another fluid pipe may be used. Further, the fluid flowing inside the fluid pipes P1 and P2 is not limited to clean water, and may be, for example, industrial water, sewage, gas, or a gas-liquid mixture of gas and liquid.

The fluid pipes P1 and P2 are connected by inserting the insertion port 2 into the receiving port 1. An annular packing 4 for sealing the gap is arranged in the gap between the receiving port 1 and the insertion port 2 inserted therein. At the end of the receiving port 1, a diameter-expanded portion 1a whose diameter is expanded toward the end surface and a flange portion 1b extending to the outer peripheral side (outside in the pipe radial direction) are formed, and the packing 4 is formed in the diameter-expanded portion 1a. Is pushed in. The push ring 3 presses the packing 4 in the pipe axis direction and pushes it into the enlarged diameter portion 1a to maintain the sealed state.

The inner diameter of the housing 30 is larger than the outer diameter of the insertion port 2, and the housing 30 can be externally fitted to the insertion port 2 with the elastic sheet 6 attached. In the present embodiment, the housing 30 is made of a non-divided annular body, and is continuously and integrally provided in the circumferential direction of the pipe. When the diameter of the fluid pipe is large, a split structure housing made of a divided annular body can also be used.

Through holes 32 are formed on the outer peripheral surface of the housing 30 at a plurality of locations (four locations in the present embodiment) in the circumferential direction of the pipe. As shown in FIG. 3, a fastener 33 composed of a bolt and a nut is attached to the through hole 32 and the through hole of the flange portion 1b. As a result, the push ring 3 is fixed to the receiving port 1, and the push ring 3 is centered with respect to the receiving port 1. Further, the packing 4 can be pressed by operating the fastener 33 to move the push ring 3 toward the receiving port 1 in close proximity.

In the present embodiment, the accommodating recess 31 is formed as an annular groove continuously extending in the circumferential direction of the pipe. However, the present invention is not limited to this, and a plurality of accommodating recesses having an arc shape may be formed intermittently. A push bolt 52 is screwed into a bolt hole penetrating the outer peripheral surface of the accommodating recess 31, and the retaining member 5 can be moved in the pipe radial direction by operating the push bolt 52. It is also possible to make the housing 30 a split structure, omit the push bolt 52 and the bolt hole, and press the retaining member 5 by the outer peripheral surface of the accommodating recess 31.

The push ring 3 includes a plurality of (four in this embodiment) retaining members 5 arranged along the circumferential direction of the pipe. Each of the retaining members 5 has a bow shape curved along the circumferential direction of the pipe, and a claw portion 51 is projected on the inner peripheral surface thereof. In the present embodiment, the two claw portions 51 are arranged at intervals in the pipe axis direction, but the number of the claw portions 51 is not particularly limited. An elastic material 53 is interposed between the side surface of the retaining member 5 and the side surface of the accommodating recess 31 to prevent the retaining member 5 from falling out of the accommodating recess 31.

An inclined surface with which the tip of the push bolt 52 abuts is provided on the outer peripheral surface of the retaining member 5. As a result, when an external force in the direction of the pipe axis that separates the insertion port 2 from the receiving port 1 acts, the retaining member 5 is strongly pressed toward the outer peripheral surface of the insertion port 2 by the wedge effect, and the detachment prevention function is enhanced. .. Even when the push bolt 52 is omitted, the same wedge effect can be exhibited by pressing the inclined surface of the retaining member 5 with the outer peripheral surface of the accommodating recess 31.

In the present embodiment, the claw portion 51 of the retaining member 5 and the claw portion 51 of another retaining member 5 adjacent thereto are in a state where the claw portion 51 is bitten into the outer peripheral surface of the insertion port 2 as shown in FIG. And are configured to overlap each other in the pipe axis direction. Therefore, the region where the claw portion 51 bites into the outer peripheral surface of the insertion port 2 is continuous in the circumferential direction of the pipe, and a very excellent detachment prevention function can be exhibited. The configuration of such a retaining member is disclosed in Japanese Patent Application Laid-Open No. 2008-309186 by the applicant. However, the present invention is not limited to this.

The elastic sheet 6 has a cylindrical shape as a whole and is detachably attached to the housing 30. The elastic sheet 6 is a member separate from the retaining member 5, and is neither adhered nor fixed to the claw portion 51. In the present embodiment, the elastic sheet 6 is made of a non-divided annular body and is continuously and integrally provided in the circumferential direction of the pipe. However, when a split-structured housing is used, an elastic sheet having an arc shape may be used according to the divided pieces of the housing. A rubber material such as natural rubber, urethane rubber, or silicone rubber is preferably used for the elastic sheet 6.

In this embodiment, both ends of the elastic sheet 6 are attached to the side surfaces of the housing 30. By attaching the end of the elastic sheet 6 to the side surface of the housing 30 facing the pipe axis direction instead of the inner peripheral surface of the housing 30, it is easy to attach the elastic sheet to the housing 30 and it does not come off with some vibration or impact. The elastic sheet 6 is stable. A structure in which only one end of the elastic sheet 6 is attached to the side surface of the housing 30 is also possible, but in that case, from the viewpoint of preventing the elastic sheet 6 from coming off when the insertion port 2 is inserted, the insertion port 2 It is preferable to attach the end portion of the elastic sheet 6 located on the rear side (left side in FIGS. 2 and 3) in the insertion direction.

Regarding the attachment of the elastic sheet 6 to the housing 30, in the first embodiment, an example is shown in which the end portion of the elastic sheet 6 is formed by being folded back in a hook shape, and the end portion is hooked on the side surface of the housing 30. As shown in FIG. 4, both ends of the elastic sheet 6 are formed in a C shape, and these are hooked on the flanges on the side surface of the housing 30 as shown in FIG. The flange portion on the front side in the insertion direction of the insertion port 2 is a portion for pressing the packing 4 as shown in FIG. Such an elastic sheet 6 can be easily attached to the housing 30 and does not easily fall off from the housing 30.

The state of FIG. 3 in which the pipe joint is assembled is generally obtained by going through the following steps. First, the housing 30 of the push ring 3 is fitted onto the insertion port 2, and the insertion port 2 is inserted into the receiving port 1. If the push ring 3 has a split structure, it can be externally fitted into the insertion port 2 after being inserted into the receiving port 1. Next, the packing 4 is pressed by the push ring 3 to seal between the inner peripheral surface of the receiving port 1 and the outer peripheral surface of the insertion port 2, and the fastener 33 is tightened to fix the pushing ring 3 to the receiving port 1. Then, the push bolt 52 is operated to move the retaining member 5 toward the insertion port 2, and the claw portion 51 is made to bite into the outer peripheral surface of the insertion port 2.

When the claw portion 51 is made to bite into the outer peripheral surface of the insertion opening 2, the elastic sheet 6 covering the opening of the accommodating recess 31 is cut by the claw portion 51, and the elastic sheet 6 around the claw portion 51 is the outer circumference of the insertion opening 2. It is pressed against the surface. Therefore, even if the anticorrosion film formed on the outer peripheral surface of the insertion port 2 is peeled off due to the bite of the claw portion 51, water or the like in the buried soil does not invade the exposed metal portion, and the claw portion 51 The anticorrosion effect in the surrounding area is enhanced. Further, when the housing 30 is fitted onto the insertion port 2, the opening of the accommodating recess 31 is covered with the elastic sheet 6, so that there is no concern that the outer peripheral surface of the insertion port 2 will be damaged by the claw portion 51.

The elastic sheet 6 is attached to the housing 30 as a member separate from the retaining member 5, and if the elastic sheet 6 is not required, it can be removed from the housing 30. Therefore, the versatility of the retaining member 5 Excellent for. In addition, if the elastic sheet 6 deteriorates over time and becomes unusable due to circumstances such as storage in a warehouse for a long period of time before use, another elastic sheet can be attached to the housing 30. That's enough. Therefore, the retaining member 5 is not wasted, and the work of removing the elastic sheet 6 from the retaining member 5 is unnecessary, so that the retaining member 5 is excellent in convenience.

In the elastic sheet 6, it is preferable that the thickness of the first region 61 is smaller than the thickness of the second region 62. As shown in FIG. 2, the first region 61 is a region facing the claw portion 51 of the retaining member 5, and the second region 62 faces the outer peripheral surface of the insertion port 2 and is the first region 61. It is a pair of regions located across the. The difference in thickness is not shown in the drawings. According to such a configuration, since the first region 61 is easily cut by the claw portion 51, it becomes easy for the claw portion 51 to bite into the outer peripheral surface of the insertion port 2, and the detachment prevention function can be smoothly exhibited. Further, as the first region 61 is cut, the second region 62 easily adheres to the outer peripheral surface of the insertion port 2, which contributes to the improvement of the anticorrosion effect.

As shown enlarged in FIG. 4, in the present embodiment, the inner peripheral surface of the elastic sheet 6 has a corrugated cross-sectional shape, and a plurality of ridges 63 extending in the circumferential direction of the pipe are arranged in the axial direction of the pipe. There is. For example, a shape in which the height of the ridges 63 is 1 mm and the distance between the adjacent ridges 63 is 1 mm can be considered. According to such a configuration, the outer peripheral surface of the insertion port 2 and the elastic sheet 6 can be well sealed to enhance the anticorrosion effect around the claw portion 51. In this example, the ridge 63 is provided on the inner peripheral surface of the region 6A facing the accommodating recess 31. The ridge 63 has a triangular cross section, but a shape different from this may be adopted.

[Second Embodiment]
The second embodiment is a modification of the shape of the housing 30 and the attachment method of the elastic sheet 6 in the first embodiment. Since the second embodiment can be configured in the same manner as the first embodiment except for the configuration described below, common points will be omitted and differences will be mainly described. The same members as those described in the first embodiment are designated by the same reference numerals, and duplicate description will be omitted.

As shown in FIG. 5, regarding the attachment of the elastic sheet 6 to the housing 30, in the second embodiment, the recess 34 is provided on the side surface of the housing 30, and the elastic sheet 6 is fitted into the recess 34 at the end. An example in which the part 64 is formed is shown. The recess 34 extends in an annular shape along the circumferential direction of the pipe, and in this example, has a semicircular cross section. The fitting portion 64 has a shape corresponding to the recess 34. The elastic sheet 6 can be easily attached to the housing 30 and does not easily fall off from the housing 30.

The structure in which the fitting portion 64 is fitted into the recess 34 in this way is useful when the flange portion of the housing is small as shown in FIG. 5 or when the housing does not have the flange portion. Further, in the present embodiment, the fitting structure is applied only to one end of the elastic sheet 6, but this may be applied to both ends or only to the opposite end. Further, the fitting structure may be used in combination with the structure in which the fitting portion is formed at the end portion of the elastic sheet formed in the shape of a hook and hooked on the side surface of the housing described in the first embodiment.

In the present embodiment, the elastic sheet 6 is formed by bulging at two positions in the pipe axis direction sandwiching the accommodating recess 31 toward the inner peripheral side or the front side in the insertion direction of the insertion port 2. It has parts 65 and 66. The seal protrusion 65 is in close contact with the outer peripheral surface of the insertion slot 2 to prevent water or the like from entering from the rear side of the insertion slot 2 in the insertion direction. The seal protrusion 66 is in close contact with the packing 4 (see FIG. 3) to prevent water or the like from entering from the front side in the insertion direction. Therefore, according to this configuration, it is possible to effectively prevent water or the like from entering the exposed metal portion, and further enhance the anticorrosion effect around the claw portion 51. The seal protrusion 66 may be formed to bulge toward the inner peripheral side. Such a seal protrusion can also be applied to the elastic sheet 6 of the first embodiment.

[Third Embodiment]
In the third embodiment, an example in which the fluid pipe detachment prevention device is applied to the socket of the fluid pipe in the slip-on type pipe joint is shown. Since the third embodiment can be configured in the same manner as the first and second embodiments except for the configurations described below, the common points will be omitted and the differences will be mainly described. The same members as those described in the first embodiment are designated by the same reference numerals, and duplicate description will be omitted.

The detachment prevention device shown in FIG. 6 is used for a slip-on type pipe joint formed by inserting the insertion port 2 of the other fluid pipe P2 into the receiving port 7 of one fluid pipe P7. The packing 41 is compressed by inserting the insertion port 2 into the receiving port 7, and seals between the inner peripheral surface of the receiving port 7 and the outer peripheral surface of the insertion port 2. This device includes a housing 70 made of an annular body integrally formed with a receiving port 7, a retaining member 5, and an elastic sheet 6. In this example, one end of the elastic sheet 6 is attached to the side surface of the housing 70, which is also the end face of the socket 7. Although the end portion of the elastic sheet 6 formed by folding back into a hook shape is hooked as in the first embodiment, the fitting structure as in the second embodiment may be adopted.

[Fourth Embodiment]
In the fourth embodiment, an example in which the fluid pipe detachment prevention device is applied to the reinforcing metal fitting in the pipe joint is shown. Since the fourth embodiment can be configured in the same manner as the first and second embodiments except for the configuration described below, the common points will be omitted and the differences will be mainly described. The same members as those described in the first embodiment are designated by the same reference numerals, and duplicate description will be omitted.

The reinforcing metal fitting 8 shown in FIG. 7 is externally fitted to a connection portion of a pipe joint formed by inserting the insertion port 2 of the other fluid pipe P2 into the receiving port 1 of one fluid pipe P1. This pipe joint is a mechanical type pipe joint, and a normal push ring 9 having no built-in retaining member is fixed to the receiving port 1. When an external force in the direction of the pipe axis that separates the insertion port 2 from the receiving port 1 acts, the hook-shaped engaging portion 82 engages with the flange portion 1b of the receiving port 1 and the claw portion 51 of the retaining member 5 It can exert a detachment prevention function by the biting action.

The reinforcing metal fitting 8 includes a housing 80 formed separately from the receiving port 1, a retaining member 5 housed in a housing recess 81 of the housing 80, and an elastic sheet 6 mounted on the housing 80. The elastic sheet 6 is attached to the housing 80 with a configuration according to the first embodiment, but this may be replaced with a configuration according to the second embodiment. Further, it is not limited to the mechanical type pipe joint, and can be applied to the reinforcing metal fitting that exerts the detachment prevention function in the slip-on type pipe joint.

The housing 80 of the present embodiment has a split structure composed of a plurality of split pieces so that it can be fitted and mounted on the connection portion of the existing pipe joint. In this case, an elastic sheet 6 having an arc shape according to the divided pieces may be used. Alternatively, the elastic sheet 6 is wound around the outer peripheral surface of the insertion port 2 in an annular shape to bond the ends to each other, the housing 80 is externally fitted around the outer periphery, and then the elastic sheet 6 is attached to the housing 80 (example of FIG. 7). Then, the end portion of the elastic sheet 6 can be hooked on the side surface of the housing 80). Such a method can also be applied to the above-mentioned first to third embodiments when the housing has a split structure.

The present invention is not limited to the above-described first to fourth embodiments, and various improvements and changes can be made without departing from the spirit of the present invention. Therefore, for example, the number of retaining members can be appropriately changed according to the intended use and conditions.

1 Receiving port 2 Insertion port 3 Pushing wheel 4 Packing 5 Retaining member 6 Elastic sheet 7 Receiving port 8 Reinforcing metal fittings 30 Housing 31 Storage recess 34 Recess 51 Claw 52 Push bolt 61 First area 62 Second area 63 Protrusion 64 Fitting part 65 Seal protrusion 66 Seal protrusion 70 Housing 80 Housing P1 Fluid pipe P2 Fluid pipe P7 Fluid pipe

Claims (6)

In a fluid pipe detachment prevention device used for a pipe joint formed by inserting the insertion port of the other fluid pipe into the socket of one fluid pipe.
A housing composed of an annular body formed separately or integrally from the socket and having a storage recess that opens toward the inner peripheral side.
A retaining member having a claw portion that can bite into the outer peripheral surface of the insertion port and housed in the storage recess,
An elastic sheet attached to the housing so as to cover the opening of the accommodating recess,
An annular packing for sealing the gap between the receiving port and the insertion port is provided.
The elastic sheet Ri separate member Dare and the packing,
The elastic sheet is a member separate from the retaining member, and is neither adhered nor fixed to the retaining member.
A flange portion protruding in the pipe axial direction is formed on one or both side surfaces of a pair of side surfaces sandwiching the accommodating recess in the housing from both sides in the pipe axial direction.
A device for preventing a fluid tube from coming off, in which both or one end of the elastic sheet in the tube axial direction is formed by folding back in a hook shape, and the hook-shaped end is hooked on a flange portion of the housing. The device for preventing detachment of a fluid pipe according to claim 1, wherein an elastic material, which is a member separate from the elastic sheet, is interposed between the retaining member and the inner wall of the side surface of the accommodating recess. The device for preventing detachment of a fluid pipe according to claim 1 or 2 , wherein a recess is provided on a side surface of the housing, and an fitting portion to be fitted into the recess is formed at an end portion of the elastic sheet. Before SL elastic sheet, at two locations in the tube axis direction to a position across the housing recess, wherein having an annular sealing projection which is bulged formed toward the insertion direction front side of the inner circumferential side or the spigot Item 3. The device for preventing the fluid pipe from coming off according to any one of Items 1 to 3. Before SL elastic sheet has a first region facing the claw portion of the retaining member, and a pair of second regions located across the opposite and the first region on the outer circumferential surface of the spigot Have and
The device for preventing detachment of a fluid pipe according to any one of claims 1 to 4, wherein the thickness of the first region is smaller than the thickness of the second region. The device for preventing detachment of a fluid tube according to any one of claims 1 to 5, wherein the inner peripheral surface of the elastic sheet has a wavy cross section.

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