JP2018132108A - Separation prevention device for fluid pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a separation prevention device for fluid pipe, capable of enhancing an anticorrosion effect around a claw part of a falling prevention member, and excellent in versatility and convenience of the falling prevention member.SOLUTION: A separation prevention device for fluid pipe used in a pipe joint where into a socket 1 of one fluid pipe P1 a spigot 2 of the other fluid pipe P2 is inserted, includes: a housing 30 comprising an annular body formed separately from the socket 1, and having a storage recess part 31 opened toward an inner peripheral side; a falling prevention member 5 having a claw part 51 capable of being bitten onto an outer peripheral surface of the spigot 2, and stored in the storage recess part 31; and an elastic sheet 6 mounted on the housing 30 so as to cover an opening of the storage recess part 31.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a fluid pipe detachment preventing device used for a pipe joint in which an insertion opening of another fluid pipe is inserted into a receiving opening of one fluid pipe.

  Patent Document 1 describes a push wheel as such a fluid pipe detachment prevention device. This push wheel includes an annular housing that is mounted on the outer periphery of the insertion port, and a retaining member that has a claw portion that can bite into the outer peripheral surface of the insertion port. The housing has a housing recess that opens toward the inner periphery, and a plurality of retaining members are housed in the housing recess. By causing the claw portion of the retaining member to bite into the outer peripheral surface of the insertion opening, it is possible to exert a function of preventing the insertion opening from being detached from the receiving opening, that is, a separation prevention function.

  If the anticorrosion film formed on the outer peripheral surface of the insertion hole is peeled off by the biting of the nail part and the metal part exposed around the nail part is corroded, the biting action of the nail part is weakened, and the anti-separation function for a long time It cannot be maintained. Therefore, in the press wheel described in Patent Document 1, in order to enhance the anticorrosion effect around the claw portion of the retaining member, an elastic seal member is bonded or fixed to the surface of the claw portion, and the exposed metal portion is buried in the buried soil. Water is prevented from entering. Patent Documents 2 and 3 also describe a similar retaining member.

  However, the above-described retaining member has poor versatility because the elastic seal member is integrally bonded or fixed together, and is difficult to use in situations where the elastic seal member is not required. In addition, if the elastic seal member has deteriorated over time 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 bonded or fixed can be removed. This is wasteful, or a complicated operation for removing the elastic seal member from the retaining member is required, so that it cannot be said that it is excellent in convenience.

JP 2000-304177 A JP 2013-164107 A JP 2013-167329 A

  The present invention has been made in view of the above circumstances, and its purpose is to enhance the anticorrosion effect around the claw portion of the retaining member, and to remove the fluid pipe excellent in versatility and convenience of the retaining member. It is to provide a prevention device.

  The fluid pipe detachment preventing device according to the present invention is a fluid pipe detachment preventing apparatus used for a pipe joint formed by inserting an insertion port of the other fluid pipe into a receiving port of one fluid pipe. Is formed of an annular body formed separately or integrally, and has a housing having a housing recess that opens toward the inner periphery, and a claw that can bite into the outer peripheral surface of the insertion slot. A retaining member housed therein; and an elastic sheet mounted on the housing so as to cover the opening of the housing recess.

  According to such a configuration, when the claw portion of the retaining member is bitten into the outer peripheral surface of the insertion opening, the elastic sheet covering the opening of the housing recess is cut by the claw portion, and the elastic sheet around the claw portion is inserted. Pressed against the outer peripheral surface of the mouth. For this reason, even when the anticorrosion film is peeled off, water in the buried soil does not enter the exposed metal part, and the anticorrosion effect around the nail part is enhanced. In addition, since the elastic sheet is attached to the housing, the retaining member is not wasted even if the elastic sheet becomes unusable, and the work for removing the elastic sheet from the retaining member is not required. Excellent 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 this case, the end portion of the elastic sheet may be formed in a hook shape, and the end portion may be hooked on the side surface of the housing. Alternatively, or in addition, a recess may be provided on the side surface of the housing, and an insertion portion that fits into the recess may be formed at an end of the elastic sheet.

  The elastic sheet has annular seal protrusions that are formed to bulge toward the inner peripheral side or the insertion direction front side of the insertion port at two locations in the tube axis direction located across the housing recess. preferable. According to such a configuration, water or the like can be effectively prevented from entering the exposed metal portion, and the anticorrosion effect around the claw portion of the retaining member can be further enhanced.

  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 sandwiching the first region. And it is preferable that the thickness of the said 1st area | region is smaller than the thickness of the said 2nd area | region. According to this configuration, since the elastic sheet is easily cut by the claw portion, the claw portion can be easily bited into the outer peripheral surface of the insertion opening, and the separation preventing function can be smoothly exhibited. Moreover, it becomes easy for the 2nd area | region to closely_contact | adhere to the outer peripheral surface of an insertion opening, and it contributes to the improvement of the anticorrosion effect in a nail | claw part periphery.

  It is preferable that the inner peripheral surface of the elastic sheet has a cross-sectional wave shape. According to this configuration, the space between the outer peripheral surface of the insertion opening and the elastic sheet is satisfactorily sealed, and the anticorrosion effect around the claw portion can be enhanced.

The front view of the separation prevention device (press wheel) in the first embodiment of the present invention. AO cross section of press ring A-B-B cross-sectional view of a push ring attached to a pipe joint Cross section of elastic sheet Sectional drawing of the separation prevention apparatus (press wheel) in 2nd Embodiment of this invention Sectional drawing of the separation prevention apparatus (portion of a fluid pipe) in 3rd Embodiment of this invention Sectional drawing of the separation prevention apparatus (reinforcing metal fittings) in 4th Embodiment of this invention

  The fluid pipe detachment preventing device according to the present invention includes, for example, a push ring in a mechanical type pipe joint (first and second embodiments), a fluid pipe inlet in a slip-on type pipe joint (third embodiment), The present invention 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]
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 pusher wheel 3 is formed of an annular body formed separately from the receiving port 1, and bites into the housing 30 having the housing recess 31 that opens toward the inner peripheral side (inner side in the tube diameter direction) and the outer peripheral surface of the insertion port 2. A retaining member 5 having a possible claw portion 51 and 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 are provided. The pusher wheel 3 includes a push bolt 52 as a pressing member that presses the retaining member 5 toward the inner peripheral side.

  Each of the fluid pipes P1 and P2 is a ductile cast iron pipe for waterworks buried in the ground. However, it is not restricted to this, For example, a steel pipe, a vinyl chloride pipe, a polyethylene pipe, a polyolefin pipe, and other fluid pipes may be used. The fluid flowing in the fluid pipes P1 and P2 is not limited to clean water, but may be industrial water, sewage, gas, a gas-liquid mixture of gas and liquid, or the like.

  The fluid pipes P <b> 1 and P <b> 2 are connected by inserting the insertion port 2 into the receiving port 1. An annular packing 4 that seals the gap is disposed in the gap between the receptacle 1 and the insertion slot 2 inserted therein. The end portion of the receiving port 1 is formed with a diameter-enlarged portion 1a that is expanded toward the end surface, and a flange portion 1b that is extended to the outer peripheral side (outside in the pipe radial direction). Is pushed in. The pusher wheel 3 pushes the packing 4 in the tube axis direction and pushes it into the enlarged diameter portion 1a to maintain a sealed state.

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

  On the outer peripheral surface of the housing 30, through holes 32 are formed at a plurality of locations (four locations in the present embodiment) in the tube circumferential direction. 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 shown in FIG. As a result, the pusher wheel 3 is fixed to the receiving port 1 and the centering (centering) of the pusher wheel 3 with respect to the receiving port 1 is performed. Further, the packing 4 can be pressed by operating the fastener 33 and moving the pusher wheel 3 toward the receiving port 1 in proximity.

  In the present embodiment, the housing recess 31 is formed as an annular groove extending continuously in the pipe circumferential direction. However, it is not restricted to this, The some accommodating recessed part which makes circular arc shape may be formed intermittently. A push bolt 52 is screwed into a bolt hole that penetrates the outer peripheral surface of the housing recess 31, and the retaining member 5 can be moved in the pipe diameter direction by operating the push bolt 52. While the housing 30 has a split structure, it is possible to omit the push bolt 52 and the bolt hole and press the retaining member 5 by the outer peripheral surface of the housing recess 31.

  The pusher wheel 3 includes a plurality of (four in this embodiment) retaining members 5 arranged along the pipe circumferential direction. Each retaining member 5 has an arcuate shape that is curved along the pipe circumferential direction, and a claw portion 51 projects from the inner circumferential surface thereof. In the present embodiment, the two claw portions 51 are arranged at intervals in the tube 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 housing recess 31 to prevent the retaining member 5 from dropping from the housing recess 31.

  On the outer peripheral surface of the retaining member 5, an inclined surface with which the tip of the push bolt 52 abuts is provided. Accordingly, when an external force in the tube axis direction that causes the insertion opening 2 to be detached from the receiving opening 1 is applied, the retaining member 5 is strongly pressed toward the outer peripheral surface of the insertion opening 2 by the wedge effect, and the separation preventing 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 by the outer peripheral surface of the housing 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 to the retaining member 5 in a state where the claw portion 51 is bitten into the outer peripheral surface of the insertion opening 2 as shown in FIG. Are configured to overlap each other in the tube axis direction. For this reason, the area | region where the nail | claw part 51 bites into the outer peripheral surface of the insertion port 2 continues in the pipe | tube circumferential direction, and can exhibit the very outstanding detachment | leave prevention function. The structure of such a retaining member is disclosed in Japanese Patent Application Laid-Open No. 2008-309186 by the present 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 separate member from the retaining member 5 and is not bonded or fixed to the claw portion 51. In the present embodiment, the elastic sheet 6 is made of a non-divided annular body and is integrally provided continuously in the pipe circumferential direction. However, when a split structure housing is used, an elastic sheet having an arc shape may be used according to the divided piece of the housing. A rubber material such as natural rubber, urethane rubber, or silicone rubber is preferably used for the elastic sheet 6.

  In the present embodiment, both end portions of the elastic sheet 6 are attached to the side surface of the housing 30. By attaching the end portion of the elastic sheet 6 not to the inner peripheral surface of the housing 30 but to the side surface of the housing 30 facing the tube axis direction, the mounting to the housing 30 is facilitated, and the degree to which the elastic sheet 6 cannot be detached by some vibration or impact. The elastic sheet 6 is stabilized. 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 due to the insertion of the insertion slot 2, It is preferable to attach the edge part of the elastic sheet 6 located in the insertion direction back side (left side of FIG.2, 3).

  Regarding the attachment of the elastic sheet 6 to the housing 30, in the first embodiment, an example in which an end portion of the elastic sheet 6 is formed in a hook shape and the end portion is hooked on a side surface of the housing 30 is shown. As shown in FIG. 4, both end portions of the elastic sheet 6 are formed in a C shape, and these are hooked on the flange portion on the side surface of the housing 30 as shown in FIG. 2. The collar part of the insertion direction front side of the insertion slot 2 is a site | part which presses the packing 4 like FIG. Such an elastic sheet 6 is easy to attach to the housing 30 and does not easily fall off the housing 30.

  The state of FIG. 3 in which the pipe joint has been assembled can be obtained generally through the following steps. First, the housing 30 of the pusher wheel 3 is fitted over the insertion slot 2, and the insertion slot 2 is inserted into the receiving slot 1. If the pusher wheel 3 has a split structure, it can be externally fitted into the insertion slot 2 after being inserted into the receiving slot 1. Next, the packing 4 is pressed with the presser wheel 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 presser wheel 3 to the receiving port 1. Then, by operating the push bolt 52, the retaining member 5 is moved toward the insertion opening 2, and the claw portion 51 is bitten into the outer peripheral surface of the insertion opening 2.

  When the claw part 51 is bitten into the outer peripheral surface of the insertion slot 2, the elastic sheet 6 covering the opening of the housing recess 31 is cut by the claw part 51, and the elastic sheet 6 around the claw part 51 is the outer periphery of the insertion slot 2. Pressed against the surface. For this reason, even if the anticorrosion film formed on the outer peripheral surface of the insertion opening 2 is peeled off by the biting of the claw portion 51, water in the buried soil does not enter the exposed metal portion, and the claw portion 51 The anti-corrosion effect in the vicinity is enhanced. Further, when the housing 30 is externally fitted to the insertion slot 2, the opening of the accommodation recess 31 is covered with the elastic sheet 6, so that the outer peripheral surface of the insertion slot 2 is not damaged by the claw part 51.

  The elastic sheet 6 is attached to the housing 30 as a separate member from the retaining member 5, and can be removed from the housing 30 in a situation where the elastic sheet 6 is not required. Excellent. In addition, when the elastic sheet 6 is deteriorated over time due to circumstances such as being stored in a warehouse for a long time before use, it becomes impossible to use the elastic sheet 6 by attaching another elastic sheet 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 not necessary, so that the convenience of the retaining member 5 is excellent.

  In the elastic sheet 6, the thickness of the first region 61 is preferably 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 is opposed to the outer peripheral surface of the insertion slot 2 and the first region 61. It is a pair of area | region located on both sides of. 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, the claw portion 51 can be easily bited into the outer peripheral surface of the insertion slot 2, and the separation preventing function can be smoothly exhibited. Moreover, the 2nd area | region 62 becomes easy to closely_contact | adhere to the outer peripheral surface of the insertion port 2 with the cutting | disconnection of the 1st area | region 61, and contributes to the improvement of a corrosion-proof effect.

  As shown in FIG. 4 in an enlarged manner, in the present embodiment, the inner peripheral surface of the elastic sheet 6 has a cross-sectional wave shape, and a plurality of protrusions 63 extending in the pipe circumferential direction are arranged in the pipe axis direction. Yes. For example, a shape in which the height of the protrusion 63 is 1 mm and the interval between the adjacent protrusions 63 is 1 mm is conceivable. According to such a configuration, it is possible to satisfactorily seal the space between the outer peripheral surface of the insertion slot 2 and the elastic sheet 6 and 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 6 </ b> A facing the accommodation 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 obtained by modifying the shape of the housing 30 and how to attach 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, the differences will be mainly described and differences will be mainly described. The same members as those described in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 5, with respect to the attachment of the elastic sheet 6 to the housing 30, in the second embodiment, a recess 34 is provided on the side surface of the housing 30, and the end of the elastic sheet 6 is fitted into the recess 34. The example in which the part 64 is formed is shown. The recess 34 extends in an annular shape along the pipe circumferential direction, and has a semicircular cross section in this example. 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 the housing 30.

  Thus, the structure which inserts the insertion part 64 in the hollow 34 is useful when the collar part of a housing is small like FIG. 5, or when the housing does not have a collar part. Moreover, in this embodiment, although this fitting structure is applied only to the one edge part of the elastic sheet 6, you may apply this only to the both edge part or the other edge part. Furthermore, an insertion part may be formed in the edge part of the elastic sheet formed in the hook shape, and the structure hooked on the side surface of the housing described in the first embodiment and the fitting structure may be used in combination.

  In the present embodiment, the elastic sheet 6 is an annular seal protrusion formed by bulging toward the inner peripheral side or the insertion direction front side of the insertion port 2 at two locations in the tube axis direction located with the accommodation recess 31 interposed therebetween. Parts 65 and 66. The seal projection 65 is in close contact with the outer peripheral surface of the insertion slot 2 and prevents entry of water or the like from the rear side in the insertion direction of the insertion slot 2. The seal protrusion 66 is in close contact with the packing 4 (see FIG. 3) and prevents intrusion of water or the like from the front side in the insertion direction. Therefore, according to this configuration, it is possible to effectively prevent water and the like from entering the exposed metal part, and to further enhance the anticorrosion effect around the claw part 51. The seal protrusion 66 may be bulged 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 preventing device is applied to a fluid pipe receiving port in a slip-on type pipe joint will be described. Since the third embodiment can be configured in the same manner as the first and second embodiments except for the configuration described below, the differences will be mainly described, with differences being mainly described. The same members as those described in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  The separation preventing 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 formed of an annular body formed integrally with the 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 that is also the end surface of the receiving port 7. Although the end part of the elastic sheet 6 formed by folding back like a hook is hooked as in the first embodiment, a fitting structure as in the second embodiment may be adopted.

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

  The reinforcing metal fitting 8 shown in FIG. 7 is externally attached to a connecting 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 that does not incorporate a retaining member is fixed to the receiving port 1. When an external force in the tube axis direction that causes the insertion port 2 to be detached from the receiving port 1 is applied, the hook-shaped engaging portion 82 is engaged with the flange portion 1b of the receiving port 1 and the claw portion 51 of the retaining member 5 is engaged. Detachment prevention function can be exerted 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 attached to the housing 80. The elastic sheet 6 is mounted on 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, the present invention is not limited to mechanical type pipe joints, and can be applied to reinforcing metal fittings that exhibit a detachment preventing function in slip-on type pipe joints.

  The housing 80 of the present embodiment has a split structure composed of a plurality of divided pieces so that it can be externally fitted to the connection location of the existing pipe joint. In this case, you may use the elastic sheet 6 which makes | forms circular arc shape according to a division | segmentation piece. Alternatively, the elastic sheet 6 is wound around the outer peripheral surface of the insertion port 2 in an annular shape, the ends are bonded to each other, and the housing 80 is fitted on the outer periphery, and then the elastic sheet 6 is mounted on the housing 80 (example in FIG. 7). Then, the end of the elastic sheet 6 can be hooked on the side surface of the housing 80). Such a technique can also be applied to the first to third embodiments described above when the housing has a split structure.

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

DESCRIPTION OF SYMBOLS 1 Receiving port 2 Inserting port 3 Push ring 4 Packing 5 Retaining member 6 Elastic sheet 7 Receiving port 8 Reinforcing metal fitting 30 Housing 31 Housing recessed part 34 Depression 51 Claw part 52 Pushing bolt 61 1st area | region 62 2nd area | region 63 Projection 64 Insertion portion 65 Seal projection 66 Seal projection 70 Housing 80 Housing P1 Fluid pipe P2 Fluid pipe P7 Fluid pipe

Claims (7)

In a fluid pipe detachment preventing device used for a pipe joint formed by inserting an insertion port of the other fluid pipe into a receiving port of one fluid pipe,
A housing having an accommodating recess that is formed separately from or integrally with the receiving port and that is open toward the inner periphery;
A claw portion that can bite into the outer peripheral surface of the insertion opening, and a retaining member housed in the housing recess,
And an elastic sheet mounted on the housing so as to cover the opening of the housing recess.   The fluid pipe detachment preventing device according to claim 1, wherein both or one end of the elastic sheet is attached to a side surface of the housing.   The fluid pipe detachment preventing device according to claim 2, wherein an end portion of the elastic sheet is formed by folding back into a hook shape, and the end portion is hooked on a side surface of the housing.   The fluid pipe detachment preventing device according to claim 2, wherein a recess is provided on a side surface of the housing, and an insertion portion that is fitted into the recess is formed at an end of the elastic sheet.   The elastic sheet has annular seal protrusions that are formed to bulge toward an inner peripheral side or a front side in the insertion direction of the insertion opening at two locations in the tube axis direction that are located with the accommodation recess interposed therebetween. The fluid pipe detachment preventing device according to any one of claims 1 to 4. 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 sandwiching the first region. And
The fluid pipe detachment preventing device according to any one of claims 1 to 5, wherein the thickness of the first region is smaller than the thickness of the second region.   The fluid pipe detachment preventing device according to any one of claims 1 to 6, wherein an inner peripheral surface of the elastic sheet has a cross-sectional wave shape.

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