JP2005133887A - Branching tube flow channel shielding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely and properly exercise a desired locking function to a pair of locking links even when the loosening and mistake in setting of an operating member constituting a stopper means occur. <P>SOLUTION: This branching tube flow channel shielding device comprises a lid body capable of being mounted on a downstream-side end part of a switch valve, a first operation shaft 8 penetrated through the lid body, and a second operation shaft 9 penetrated in the first operation shaft 8. An elastic annular member 12 is mounted between both pressing plates 10, 11 at inner end sides of the operation shafts 8, 9 to shield between an inner peripheral face of a branching pipe and the pressing plates by being elastically deformed in a diameter enlargement state by clamping pressure, and a stopper means D comprising the pair of locking links 13, 14 projecting while bent in a diameter-enlargement attitude in interlocking with the sliding to an outer end side of the second operation shaft 9 to the first operation shaft 8, is mounted between the inner end side of the second operation shaft 9 and the upstream-side pressing plate 11. An inversion preventing means F is mounted to be kept into contact with and restricts an outside buckling attitude where bent pivot parts of the pair of locking links 13, 14 are projected and positioned radially outward, when the pair of locking links 13, 14 of the stopper means D are expanded to a diameter-reduction attitude. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is, for example, in a state where a branch valve for a fire hydrant or an air valve connected to a water main is branched, and water leakage from the branch is prevented while water is supplied to the water main. The present invention relates to a branch pipe flow shielding device used for replacement.

  In the conventional branch pipe flow shielding device, as shown in FIG. 19, the end opening of the branch pipe that is branched and connected to the main pipe for transporting fluid and that has a gate valve interposed therebetween is closed. A bottomed cylindrical lid 7 that can be attached to the downstream end of the gate valve, and a cylindrical first operating shaft 8 that slidably penetrates the lid 7 in the axial direction in a sealed state; And a second operating shaft 9 that slidably passes through the first operating shaft 8 in the axial direction, and a separate pressing plate is provided on the inner end side of the first operating shaft 8 and the second operating shaft 9. 10 and 11 are elastically deformed between the pressing plates 10 and 11 so that they are in close contact with the inner peripheral surface of the branch pipe by the clamping force from the axial direction by the pair of pressing plates 10 and 11. An elastic annular body 12 having a circular cross section that shields between the inner peripheral surface and the outer peripheral portions of both pressing plates 10 and 11 is interposed, and further, the inner end side of the second operating shaft 9 and In relation to the sliding of the second operating shaft 9 to the outer end side with respect to the first operating shaft 8 between the first pressing plate 10 located on the flow side and more than the shielding portion by the elastic annular body 12. There are provided retaining means D provided with three pairs of locking links 13 and 14 that protrude while bending in a diameter-enlarging posture that can be engaged with a large-diameter pipe portion formed on the upstream side. .

  The retaining means D is an outer peripheral surface of the mounting cylinder 21 slidably fitted on the inner end side of the second operation shaft 9, and is connected to the connecting portions 22 provided at three locations in the circumferential direction. The end portion of the locking link 13 positioned on the side is pivotally connected so as to be swingable, and the connecting portion 20 provided at three locations in the circumferential direction of the end surface of the second pressing plate 11 positioned on the upstream side has a downstream side. The end of the locking link 14 located at the pivot is pivotally connected so as to be swingable, and the inner end of the second operating shaft 9 is connected to the second operating shaft 9 at the maximum upstream side of the second pressing plate 11. A stopper nut 15 and a lock nut 16 for setting the moving position are screwed together (for example, see Patent Documents 1 and 2).

No. 4-3196 Japanese Patent Publication No. 7-81669

  In the conventional branch pipe flow shielding device, when the pair of the locking links 13 and 14 are extended in the reduced diameter posture, between the pair of the locking links 13 and 14 and the outer peripheral surface of the second operation shaft 9, The bending link connection point S <b> 2 of the pair of locking links 13, 14 connects the link connection point S <b> 1 with respect to the connection part 22 of the mounting cylinder 21 and the link connection point S <b> 3 with respect to the connection piece 20 of the second pressing plate 11. A space that allows bending to a state of protruding to the second operation shaft 9 side rather than the minute is formed. Therefore, when the nut 15 is loosened, the initial setting position by the nut 15 is incorrect, or when a large backlash occurs at each of the pivotal connection portions of the locking links 13 and 14, The 14 pairs of bent pivot connection points S2 are located on the line segment connecting the pivot connection point S1 with respect to the connection part 22 of the mounting cylinder 21 and the pivot connection point S3 with respect to the connection part 20 of the second pressing plate 11. As a result, when the second operating shaft 9 is slid to the outer end side with respect to the first operating shaft 8, the bending link connection point S2 of the pair of locking links 13, 14 is attached to the mounting cylinder. There is a possibility of bending in an inverted state that protrudes toward the second operation shaft 9 from a line segment connecting the pivot connection point S1 with respect to the connection portion 22 of 21 and the pivot connection point S3 with respect to the connection portion 20 of the second pressing plate 11. There is an inverted state of such a pair of locking links 13 and 14 If raw, intended locking feature by the locking link 13, 14 pairs would be lost.

  The present invention has been made in view of the above-described actual situation, and its main problem is that even if a loosening or setting error of the operation member constituting the retaining means occurs, the intended use of the locking link pair is achieved. It is the point which provides the branch pipe flow-path shielding apparatus which can always exhibit the latching function of this reliably reliably.

A first characteristic configuration of the present invention includes a downstream end portion of a gate valve so as to close an end portion opening of a branch pipe that is branched and connected to a main pipe for fluid transportation and in which a gate valve is interposed. A lid that can be attached to the end of the pipe portion connected to the tube, a cylindrical first operating shaft that slidably passes through the lid in the axial direction in a sealed state, and an axis within the first operating shaft. A second operating shaft that slidably penetrates in the core direction, and sandwiched between the pressing plates attached to the inner end sides of the first operating shaft and the second operating shaft in the axial direction by these And an elastic annular body that is elastically deformed into a diameter-expanded state in close contact with the inner peripheral surface of the branch pipe and shields between the inner peripheral surface and the outer peripheral portions of both pressing plates, and further, the second operating shaft Covered by sliding to the outer end side of the second operating shaft with respect to the first operating shaft across the inner end side and the pressing plate located on the upstream side, the shielding portion by the elastic annular body Remote A upstream branch pipe passage shielding device retaining means is provided with a locking link pair projecting while bent engageable diameter attitude relative sites,
When the locking link pair of the retaining means is extended to a reduced diameter posture, there is provided a reversal prevention means for restricting contact with the outer waist folded posture in which the bending support portion of the locking link pair projects radially outward. It is in the point.

  According to the above characteristic configuration, for example, when the locking link pair is extended to a reduced diameter posture, the locking link pair is interposed between the locking link pair and the outer peripheral surface on the inner end side of the second operation shaft. The bent pivot connection point protrudes to the second operation shaft side from the line connecting the pivot connection point with respect to the inner end side of the second operation shaft and the pivot connection point with respect to the pressing plate located on the upstream side. Under the condition that a space allowing bending is formed, the operating member for operating the retaining means may be loosened or set incorrectly, or a large backlash may occur at each pivot connecting portion of the locking link pair. Even if it occurs, the bending pivot connection point of the locking link pair does not lie on the line segment connecting the pivot connection points on both ends. It is possible to always restrict the contact to the outer hip folded posture that protrudes outward in the direction.

  Therefore, even if a loosening or setting error of the operating member for operating the retaining means occurs or a large backlash occurs at each pivot connection part of the locking link pair, the expected engagement by the locking link pair is achieved. The stopping function can always be exhibited reliably and satisfactorily.

  According to a second characteristic configuration of the branch pipe flow shielding device of the present invention, when the pair of locking links that are operated to extend to the reduced-diameter posture reaches the predetermined outer waist folded posture, the reversal prevention means has at least one engagement. The cylindrical elastic correction body that comes into contact with the stop link is provided on the inner end side of the second operating shaft.

  According to the above characteristic configuration, when the locking link pair in the expanded posture is extended to the reduced diameter posture, the bending pivot connection point of the locking link pair is on the line segment connecting the pivot connection points on both ends. Before arriving, at least one of the locking links comes into contact with the cylindrical elastic correction body sheathed on the inner end side of the second operation shaft, and the link pair is reliably maintained in a predetermined outer waist folded posture. be able to.

  Accordingly, since only the cylindrical elastic correction body is externally mounted on the inner end side of the second operating shaft, the structure can be simplified and the assembly can be facilitated, and the impact at the time of the link contact can be reduced. And noise generation can be reduced.

  According to a third characteristic configuration of the branch pipe flow path shielding device of the present invention, the inversion prevention means is fitted on the inner end side of the second operation shaft, and is pivotally connected to the end portion of one of the locking links. A ring-shaped elastic correction body that comes into contact with one of the locking links when the pair of locking links that are extended to a reduced-diameter posture reach a predetermined outer hip-folding posture. It is in the point that it is constituted by wearing.

  According to the above characteristic configuration, when the locking link pair in the expanded posture is extended to the reduced diameter posture, the bending pivot connection point of the locking link pair is on the line segment connecting the pivot connection points on both ends. Before reaching, the ring-shaped elastic corrector mounted on the mounting cylinder fitted on the inner end side of the second operating shaft is pivotally connected to the connecting portion of the mounting cylinder. Therefore, the link link can be reliably maintained in a predetermined outer waist folded posture.

  Therefore, since only the ring-shaped elastic correction body is mounted on the mounting cylinder for pivotally connecting one of the locking links, it is not necessary to secure a large space for providing the elastic correction body. Simplification and ease of assembly can be achieved, and at the time of link contact, impact reduction and noise generation can be reduced.

  According to a fourth characteristic configuration of the branch pipe flow shielding device of the present invention, the elastic annular body is configured in a cylindrical shape, and the central portion in the axial direction is configured to have a larger diameter than both end portions in the axial direction. There is in point.

  According to the above characteristic configuration, when the cylindrical elastic annular body interposed between the pair of pressing plates is elastically deformed into a diameter-enlarged state by sandwiching pressure from the axial direction by both the pressing plates, The operation resistance during compression is reduced by the amount that both ends in the axial direction are configured to have a small diameter, and the central part in the axial direction of the elastic annular body is configured to have a larger diameter than both ends in the axial direction. In addition, it is possible to ensure the amount of diameter expansion deformation as the entire elastic annular body.

  According to a fifth characteristic configuration of the branch pipe flow shielding device of the present invention, the outer peripheral surface of the central portion in the axial direction of the elastic annular body is formed in a partial spherical surface whose central position in the axial direction protrudes most outward. It is in the point.

  According to the above characteristic configuration, when the cylindrical elastic annular body interposed between the pair of pressing plates is elastically deformed into a diameter-enlarged state by sandwiching pressure from the axial direction by both the pressing plates, Both ends in the axial direction are configured to have a small diameter, and the outer peripheral surface of the central part in the large diameter is formed as a partial spherical surface whose central position in the axial direction protrudes most outward. However, since the central portion in the axial center direction of the elastic annular body is configured to have a larger diameter than both end portions in the axial core direction, it is possible to secure a large amount of expansion deformation as the entire elastic annular body.

  According to a sixth characteristic configuration of the branch pipe flow path shielding device of the present invention, the both pressing plates are formed with annular pressing portions capable of contacting the outer peripheral surfaces of both ends in the axial center direction of the cylindrical elastic annular body. There is in point.

  According to the above-mentioned characteristic configuration, when the cylindrical elastic annular body interposed between the pair of pressing plates is elastically deformed into a diameter-enlarged state by sandwiching pressure from the axial direction by these pressing plates, both pressing plates Since the annular pressing portion formed in the bite bites into the bulging portion of the elastic annular body that bulges radially outward, it is possible to reliably prevent the elastic annular body from coming off due to fluid pressure.

According to a seventh characteristic configuration of the branch pipe flow shielding device of the present invention, the inner peripheral surface of the large-diameter central portion of the elastic annular body is formed into a partial spherical surface whose central position in the axial direction protrudes outward most. It is in the point.
According to the above characteristic configuration, when the cylindrical elastic annular body interposed between the pair of pressing plates is elastically deformed into a diameter-enlarged state by sandwiching pressure from the axial direction by both the pressing plates, The axial center both ends are configured to have a small diameter, and each of the outer peripheral surface and the inner peripheral surface of the large diameter central portion is formed as a partial spherical surface whose central position in the axial direction protrudes outward most. The operating resistance during compression can be greatly reduced.

[First Embodiment]
FIG. 1 shows a branch pipe connection structure in the middle of a fluid transport path, which is connected to a connecting flange portion 1A of a branch pipe portion 1 integrally formed in the middle of a water main pipe P1, which is an example of a fluid transport main pipe. A connecting lid 2 having a connecting pipe portion 2A having a diameter smaller than the inner diameter of the connecting lid 2 is fixedly connected in a sealed state via bolts 3 and nuts 4 so as to be detachable. The connecting flange portion 2B includes a branch pipe 5 having connecting flange portions 5A and 5B at both ends, and a gate valve 6 having connecting flange portions 6A and 6B at both ends, which are sealed through bolts 3 and nuts 4, respectively. The branch pipe P2 is constituted by the branch pipe portion 1, the connection lid body 2, the branch pipe 5 and the gate valve 6 of the water main pipe P1 and is detachably fixed in the state. The side connecting flange portion 6B has a device such as an air valve B or a fire hydrant or Vascular, and the like are detachably fixedly connected in a sealed state.

Next, it is used when the gate valve 6 interposed in the branch pipe P2 is replaced with a new gate valve 6 while preventing water leakage from the branch pipe P2 while water is supplied through the water main pipe P1. The branch pipe flow shielding device A will be described.
As shown in FIG. 1 to FIG. 11, there is a bottom provided with a connecting flange portion 7A that can be connected in a sealed state to the downstream connecting flange portion 6B of the gate valve 6 so as to close the end opening of the branch pipe P2. A cylindrical first operating shaft 8 that passes through the bottom wall portion 7B of the cylindrical lid body 7 in a sealed state so as to be slidable in the axial direction in a sealed state, and the first operating shaft. And a second operating shaft 9 slidably penetrating in the axial direction in the axial center, and on the inner end side of the first operating shaft 8 and the second operating shaft 9, a flow path in the branch pipe P2, That is, the closing means C for shielding (blocking) the flow path in the connecting pipe portion 2A of the connecting lid 2 and the large-diameter pipe wall portion upstream of the shielding portion by the closing means C, that is, the connecting lid Retaining means provided with a pair of locking links 13 and 14 protruding while bending in a diameter-enlarging posture that can be engaged with the peripheral edge of the flow path opening of the cover plate portion 2C of the body 2 Together is provided, the operation unit E is provided for operating through both operating shafts 8 and 9 of the closing means C and retaining means D from the outside.

Next, the closing means C will be described.
As shown in FIGS. 2 and 11, the first pressing plate 10 includes an annular pressing surface 10 </ b> A and a hollow portion 10 </ b> B that opens concentrically toward the tip side at the inner end of the first operating shaft 8. Is fitted and fixed, and on the inner end side of the second operating shaft 9, the annular pressing surface 11 </ b> A that opposes the pressing surface 10 </ b> A of the first pressing plate 10 in the axial direction and the hollow portion of the first pressing plate 10. A second pressing plate 11 having a cylindrical portion 11B that is slidably fitted into the shaft 10B from the axial direction is externally fitted so as to be slidable in the axial direction. A stopper nut 15 and a locking nut 16 for setting the maximum movement position of the second pressing plate 11 to the upstream side are screwed into a screw shaft portion 9 a formed on the inner end side of the second operation shaft 9. ing.

  The outer diameter of the first pressing plate 10 and the outer diameter of the second pressing plate 11 are adjusted so as to be put into and out of the connecting pipe portion 2A of the connecting lid 2 from the storage chamber 7C in the lid 7 through the gate valve 6 and the branch pipe 5. The outer diameter that is smaller than the inner diameter of the connecting pipe portion 2A of the connecting lid 2 that is a constituent member of the branch pipe P2, in other words, the inner diameter that is the smallest among the constituent members of the branch pipe P2 The ball valve body 6C of the gate valve 6 is configured to have an outer diameter smaller than the inner diameter of the flow path 6D.

  Further, the cylindrical portion 11B of the second pressing plate 11 is formed in an outer diameter smaller than the inner diameter of the flow path 6D in the ball valve body 6C of the gate valve 6 in a non-pressurized state (natural state), and The inner surface of the connecting lid 2 is elastically deformed into a diameter-enlarged state in close contact with the inner peripheral wall surface of the connecting tube portion 2A by the pressing force from the axial direction by the pressing surfaces 10A and 11A of the pressing plates 10 and 11. An elastic annular body 12 made of urethane rubber that shields between the wall surface and the outer peripheral portions of both pressing plates 10 and 11 is externally provided.

  The elastic annular body 12 is configured in a cylindrical shape that can be attached in close contact with the cylindrical portion 11B of the second pressing plate 11, and its axial center portion 12a has a larger diameter than the axial end portions 12b. The outer peripheral surface 12d of the large-diameter central portion 12a is formed as a partially spherical surface whose central position in the axial center direction protrudes most outward, and further, the outer periphery of the end surfaces of both small-diameter end portions 12b. The side end surface portion 12c is formed in an annular inclined surface that is inclined at a predetermined angle (30 degrees in the present embodiment) with respect to a vertical plane orthogonal to the axis.

  Each of the outer peripheral end surface portion 10a of the pressing surface 10A of the first pressing plate 10 and the outer peripheral end surface portion 11a of the pressing surface 11A of the second pressing plate 11 is an outer peripheral annular inclined surface 12c on both end surfaces of the elastic annular body 12. Is formed on an annular inclined pressing surface that is located closer to the center position in the axial direction of the elastic annular body 12 toward the outer side in the radial direction so as to be in close contact with the axial direction from the axial direction. At the outer peripheral edge side of the pressing surface 10A and the outer peripheral edge of the pressing surface 11A of the second pressing plate 11, there are annular pressing portions 10C, 11C that are externally fitted in contact with the outer peripheral surfaces of both axial end portions 12b of the elastic annular body 12. Is formed.

  When the elastic annular body 12 interposed between the pressing plates 10 and 11 is elastically deformed into a diameter-enlarged state by the clamping force from the axial direction by the pressing plates 10 and 11, the shaft of the elastic annular body 12 is used. Since both end portions 12b in the core direction have a small diameter, and the outer peripheral surface 12d of the central portion 12a in the axial center direction is formed as a partial spherical surface whose central position in the axial center direction protrudes outward most. The operation resistance at the time is reduced, and the axial center portion 12a of the elastic annular body 12 is configured to have a larger diameter than both end portions 12b in the axial center direction. Can be secured sufficiently.

  In addition, as shown in FIGS. 10 and 11, the cylindrical elastic annular body 12 interposed between the pressing plates 10 and 11 is expanded in diameter by the pinching force from the axial direction by the pressing plates 10 and 11. When elastically deformed to the state, the annular pressing portions 10C, 11C formed on the both pressing plates 10, 11 bite into the bulging portion of the elastic annular body 12 bulging radially outward from the axial direction. The elastic annular body 12 can be reliably prevented from coming off due to the water pressure of the tap water flowing in the main pipe P1.

Next, the retaining means D will be described.
As shown in FIG. 2 and FIG. 9, a plate-like connection in which the end of the downstream locking link 14 is pivotally connected to three places on the upstream end face of the second pressing plate 11 in the circumferential direction. At the three locations in the circumferential direction of the outer peripheral surface of the mounting cylinder 21 slidably fitted to the inner end side screw shaft portion 9a of the second operation shaft 9, the portion 20 is fixed. A plate-like connecting portion 22 whose end portion of the stop link 13 is pivotally connected so as to be swingable is fixed, and further, a stopper for setting a maximum movement position of the mounting cylinder 21 upstream of the second operating shaft 9. A nut 23 is screwed onto the distal end side of the inner end side screw shaft portion 9 a of the second operation shaft 9.

  And among the connection part 20 of the 2nd press board 11, and the connection part 22 of the attachment cylinder 21, the link 13 and 14 pair are respectively linked over three sets of connection parts 20 and 22 which oppose each other in an axial direction. 7 to 9, as shown in FIGS. 7 to 9, in conjunction with sliding to the outer end side of the second operation shaft 9 with respect to the first operation shaft 8, from the shielding portion by the elastic annular body 12. 2 is configured to bend and project in a diameter-enlarging posture that can be engaged with the inner peripheral wall surface on the upstream side, that is, the flow path opening peripheral edge of the cover plate portion 2C of the connecting lid 2. As shown in FIG. 4, when the pair of locking links 13 and 14 of the retaining means D are extended in a reduced diameter posture, the outer hip fold where the bent pivotal support portion S2 of the locking links 13 and 14 pair protrudes radially outward. The posture, that is, the bending pivot connection point S2 of the pair of locking links 13 and 14 is the connection portion of the mounting cylinder 21. Inversion prevention means for restricting contact with an outer waist folded posture protruding radially outward from a line segment Y connecting the pivot connection point S1 with respect to 2 and the pivot connection point S3 with respect to the connection portion 20 of the second pressing plate 11 F is provided.

  As shown in FIG. 2, the inversion prevention means F is formed on a shaft portion located between the mounting cylinder 21 and the lock nut 16 in the inner end side screw shaft portion 9 a of the second operation shaft 9. In addition, an elastically deformable rubber elastic correction cylinder 24 that comes into contact with the sides of the three upstream locking links 13 in accordance with the extension operation to the reduced diameter posture is packaged, and the downstream end of the mounting cylinder 21 The elastic correction cylinder 24 is in contact with the sides of the three upstream locking links 13 that extend and swing radially inward while elastically compressing the elastic correction cylinder 24 locally. The correction collar part 25 received in the outer side hip folded posture of the setting limit closest to the line segment Y is integrally formed.

  The inversion prevention means F is engaged after the elastic correction cylinder 24, which is an elastic restricting portion that first comes into contact with the locking link 13 that is extended to the reduced diameter posture, and the elastic correction cylinder 24. It is comprised from the correction collar part 25 of the attachment cylinder 21 which is a hard control part contact | abutted to the stop link 13. As shown in FIG.

Next, the operation means E will be described.
As shown in FIGS. 3 and 4, the first operation shaft 8 includes an attachment shaft portion 8 a on the inner end side that is fitted and fixed to the attachment cylinder portion 10 </ b> D of the first pressing plate 10 from the axial direction. A long operation main body cylinder shaft 8A and an operation extension cylinder shaft 8B fitted and fixed to the outer end side of the operation main body cylinder shaft 8A. The inner peripheral surface 8b of the operation extension cylinder shaft 8B is a regular hexagon. Are formed on the inner circumferential surface of different diameters.

  The second operation shaft 9 includes a long operation body shaft 9A having an inner end side screw shaft portion 9a, and an operation extension shaft 9B screwed and fixed to the outer end side of the operation body shaft 9A. The operation extension shaft 9B has an outer end side screw shaft portion 9b in which an operation screw member 30 that can be brought into contact with the end portion of the operation extension cylinder shaft 8B of the first operation shaft 8 via a thrust bearing 29 is screwed. A large-diameter angular shaft portion 9c having a regular hexagonal outer peripheral surface that is slidably fitted only in the axial direction in a state in which the first operation shaft 8 is not rotatable relative to the operation extension cylinder shaft 8B is formed. Yes.

  When the operation screw member 30 is screwed to the tightening side, the first operation shaft 8 is pushed and slid to the inner end side with respect to the second operation shaft 9 as shown in FIGS. Due to the clamping action accompanying the proximity movement of the first pressing plate 10 with respect to the two pressing plates 11, the elastic annular body 12 in an uncompressed state is brought into a diameter-expanded state in close contact with the inner peripheral wall surface of the connecting pipe portion 2 </ b> A of the connecting lid 2. By elastically deforming, the space between the inner peripheral wall surface of the connecting pipe portion 2A and the outer peripheral portions of the pressing plates 10 and 11 is shielded in a sealed state.

  In addition, a pair of first presser operating rods 31 are detachably fitted and held on the operation extension cylinder shaft 8B of the first operating shaft 8, and the first presser operating rods 31 include a second The second presser foot 32 that is detachably fitted to and held by the operation extension shaft 9B of the operation shaft 9 can be freely engaged and disengaged. In the engaged state, the second operation with respect to the first operation shaft 8 is resisted against water pressure. The first locking ring 33 that prevents the shaft 9 from sliding toward the outer end side and the pair of L-shaped locking pieces 34 fixed to the bottom wall portion 7B of the lid 7 can be engaged and disengaged freely. In the engaged state, a second locking ring 35 is provided that prevents sliding of the first operating shaft 8 to the outer end side with respect to the lid body 7 against water pressure.

  The lid body 7 is connected to a drain pipe 36 for water stoppage confirmation, and the drain pipe 36 is connected to a faucet 37 having an opening / closing operation lever 37A.

Next, the replacement method of the gate valve 6 using the branch pipe flow shielding device A configured as described above will be described.
[1] As shown in FIG. 1, the gate valve 6 is closed to remove the air valve B from the connecting flange portion 6B of the gate valve 6, and the lid body 7 provided in the branch pipe flow shielding device A Attach the connecting flange 7A.

  At this time, as shown in FIG. 5, the pair of first locking rings 33 is engaged with the second presser operating bar 32, and the pair of second locking rings 35 are engaged with both locking pieces 34 of the lid body 7. The operating shafts 8 and 9 are lifted and moved upward with respect to the lid 7, and the closing means C and the retaining means D are stored in the storage chamber 7 C of the lid 7.

  The positional relationship between the operating shafts 8 and 9 in the axial direction is regulated by the first locking rings 33, and in this state, the opposing distance between the pressing plates 10 and 11 does not compress the elastic annular body 12 or Since the interval is set close to that, the elastic annular body 12 is maintained in a reduced diameter state.

[2] As shown in FIG. 6, the gate valve 6 is opened and both the operation shafts 8 and 9 are pushed and moved downward with respect to the lid body 7, and the pair of second locking rings 35 are moved to the lid body 7. The both operating shafts 8 and 9 are pushed in and held in the operating position.
At this time, the retaining means D is located in the branch pipe part 1 having a larger cross-sectional area than the flow path in the connection pipe part 2A of the connecting lid 2.

  [3] As shown in FIG. 7, when the pair of first locking rings 33 is removed from the second presser operating bar 32 and the second presser operating bar 32 is removed from the operation extension shaft 9 </ b> B of the second operating shaft 9, The second operating shaft 9 slides to the outer end side with respect to the first operating shaft 8 by the water pressure of the tap water flowing in the water main pipe P1 or this water pressure and the artificial pulling operating force, and interlocked with this. Thus, the pair of locking links 13 and 14 that are pivotally connected across the connecting portion 20 of the second pressing plate 11 and the connecting portion 22 of the mounting cylinder 21 protrude while bending in a diameter-enlarging posture.

  In this state, as shown in FIGS. 8 and 9, both the second locking rings 35 are removed from both the locking pieces 34 of the lid body 7, and the water pressure of tap water or the water pressure and the artificial pulling operation force are used. When the operating shafts 8 and 9 are slid upward with respect to the lid body 7, the pair of locking links 13 and 14 bent in a diameter-enlarging posture are arranged on the inner circumference on the upstream side of the shielding portion by the elastic annular body 12. It engages with the wall surface, that is, the periphery of the flow path opening of the cover plate portion 2 </ b> C of the connecting lid 2.

  [4] As shown in FIGS. 10 and 11, when the operation screw member 30 is artificially screwed to the tightening side, the first operation shaft 8 is pushed and slid to the inner end side with respect to the second operation shaft 9. The elastic annular body 12 in a reduced diameter state is in close contact with the inner peripheral wall surface of the connecting pipe portion 2A of the connecting lid body 2 by the clamping action accompanying the proximity movement of the first pressing plate 10 with respect to the second pressing plate 11. It is elastically deformed in the radial state, and the space between the inner peripheral wall surface of the connecting pipe portion 2A and the outer peripheral portions of the pressing plates 10 and 11 is shielded in a sealed state.

  [5] As shown in FIG. 12, after opening and closing the opening / closing operation lever 37A of the faucet 37 connected to the drain pipe 36 of the lid body 7 to discharge water, 1 After removing the presser foot 31 and the lid 7, the gate valve 6 is removed from the connecting flange portion 5B of the branch pipe 5, and a new gate valve 6 is attached to the connecting flange portion 5B of the branch pipe 5.

[Second Embodiment]
In the first embodiment described above, the first pressing plate 10 is configured to move close to the second pressing plate 11 by an artificial tightening operation of the operation screw member 30, but as shown in FIG. The pair of hydraulic jacks 40 may be configured to move the first pressing plate 10 closer to the second pressing plate 11.

In other words, the pair of first presser operation rods 31 are detachably fitted and held on the operation extension cylinder shaft 8B of the first operation shaft 8, and the mounting plate 41 of the hydraulic jack 40 is attached to each first presser operation rod 31. While being attached with a bolt 42, a substantially T-shaped operating arm 43 having a pressure receiving surface 43a capable of coming into contact with the tip of the piston rod 40A of the hydraulic jack 40 is detachably attached to the operating extension shaft 9B of the second operating shaft 9. Are screwed together.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Third Embodiment]
14 shows that when the pair of locking links 13 and 14 of the retaining means D are extended to a reduced diameter posture, the bent pivot S2 of the pair of locking links 13 and 14 protrudes radially outward. The improvement of the inversion prevention means F that abuts and regulates the outer waist folded posture is shown, and the three upstream side locking links 13 that extend and swing radially inwardly at the downstream end of the metal mounting cylinder 21 are shown. The correction collar 25 and the second connecting part are integrally formed to abut against the side and receive the upstream locking links 13 in the outer waist folded posture of the set limit closest to the line segment Y. And an elastic correction ring 45 made of elastically deformable urethane rubber or the like that comes into contact with the sides of the three upstream side locking links 13 in accordance with the extension operation to the reduced diameter posture. It is.

Similarly to the inversion prevention means F in the first embodiment, the inversion prevention means F in the third embodiment is also an elasticity that is an elastic restricting portion that first comes into contact with the locking link 13 that is extended to a reduced diameter posture. It is comprised from the correction ring 45 and the correction collar part 25 of the attachment cylinder 21 which is a hard control part which contact | abuts to the latching link 13 after contact | abutting with the elastic correction ring 45. FIG.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Fourth Embodiment]
15 and 16 show another embodiment of the elastic annular body 12, which is configured in a cylindrical shape that can be attached to the cylindrical portion 11B of the second pressing plate 11 in a close contact state, and its axial direction. The central portion 12a is configured to have a larger diameter than both axial direction end portions 12b, and the outer peripheral surface 12d of the large diameter central portion 12a is a partially spherical surface whose central position in the axial direction protrudes outward most. Furthermore, the inner peripheral surface 12e of the large-diameter central portion 12a of the elastic annular body 12 is formed as a partial spherical surface whose central position in the axial direction protrudes outward most.

  Moreover, the outer peripheral side end surface part 12c of the end surface of both the small diameter end parts 12b is formed in the cyclic | annular inclined surface which inclines at a predetermined angle (30 degree | times in the said embodiment) with respect to the vertical plane orthogonal to an axial center.

When the cylindrical elastic annular body 12 interposed between the pair of pressing plates 10 and 11 is elastically deformed into a diameter-expanded state by the clamping force from the axial direction by both the pressing plates 10 and 11, the elastic annular body 12 Both ends 12b in the axial direction of the body 12 are configured to have a small diameter, and each of the outer peripheral surface 12d and the inner peripheral surface 12e of the large-diameter central portion 12a is a partial spherical shape whose central position in the axial direction protrudes most outward. Since it is formed on the surface, the operating resistance during compression can be greatly reduced.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Fifth Embodiment]
FIGS. 17 and 18 show another embodiment of the elastic annular body 12, which is configured in a cylindrical shape that can be attached in close contact with the cylindrical portion 11B of the second pressing plate 11, and its axial direction. The central portion 12a is configured to have a larger diameter than both axial direction end portions 12b, and the outer peripheral surface 12d of the large diameter central portion 12a is annular between the pressing plates 10 and 11 over the entire area in the axial direction. It is formed on the circumferential surface of the outer diameter that is the same or substantially the same as the outer diameter of the holding portions 10C, 11C, and the outer peripheral side end surface portion 12c of the end surfaces of both small diameter end portions 12b is perpendicular to the vertical plane perpendicular to the axis. And an annular inclined surface inclined at a predetermined angle (30 degrees in the embodiment).
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Other Embodiments]
(1) In each of the embodiments described above, the inversion prevention means F is a combination of the elastic correction cylinder 24 provided on the inner end side of the second operation shaft 9 and the correction collar portion 25 of the attachment cylinder 21, or The elastic correction ring 45 and the correction collar portion 25 of the mounting cylinder 21 are combined, but the elastic correction ring 45 may be configured with only one of them.

  (2) In each of the above-described embodiments, the inversion prevention means F is provided with the elastic correction cylinder 24 provided on the inner end side of the second operation shaft 9 and the correction collar portion 25 of the attachment cylinder 21 or the elastic correction. Although the ring 45 and the correction collar portion 25 of the mounting cylinder 21 are configured, when the pair of locking links 13 and 14 of the retaining means D are extended between the locking links 13 and 14 in a reduced diameter posture, You may comprise and comprise the control member which carries out contact regulation to the predetermined | prescribed outer side hip folding attitude | position which the bending pivotal support part of the stop link pair 13 and 14 protrudes radially outward.

  In short, as the inversion prevention means F, the bending link connection point S2 of the pair of locking links 13 and 14 is connected to the connection point 22 of the mounting cylinder 21 and the connection part 20 of the second pressing plate 11 to the connection part 20 of the second pressing plate 11. Any structure can be used as long as it can regulate the contact with the designated outer hip posture that protrudes radially outward from the line segment Y connecting the pivot connection point S3 with respect to Also good.

  (3) In the above-described first embodiment, the pair of the locking links 13 and 14 of the retaining means D is connected to the tube wall portion upstream of the shielding portion by the elastic annular body 12, that is, the lid of the connecting lid 2. Although it comprised so that it might engage with the flow-path opening periphery of the board part 2C, it comprised so that this latching link 13 and 14 pair might be engaged with the opening periphery of the branch pipe part 1 in the water main pipe P1. May be.

  (4) In the first embodiment described above, the example in which the branch pipe portion 1 is integrally formed with the water main pipe 1 which is an example of the fluid transport main pipe has been described as an example, but the present invention is limited to this configuration. For example, the water main is provided with a plurality of split joints that are detachably fixed along the circumferential direction of the water main, and one of them is formed on the peripheral wall of the water main. A pipe joint in which a branch pipe portion communicating with the through hole from the pipe radial direction (branch axis direction) is integrally provided may be mounted.

  (5) In the first embodiment described above, the elastic straightening cylinder 24 and the straight collar 25 of the mounting cylinder 21 constituting the inversion prevention means F are configured to abut against one locking link 13. Alternatively, the other locking link 14 or both locking links 13, 14 may be brought into contact with each other.

1 shows a first embodiment of the present invention, a partially cutaway front view when a branch pipe flow shielding device is installed instead of an air valve, Enlarged sectional front view of the blocking means and retaining means of the branch pipe flow shielding device Enlarged sectional front view of the operating means of the branch pipe flow shielding device IV-IV line side view in FIG. Cross-sectional front view when branch pipe flow shielding device is connected to gate valve Cross-sectional front view when closing means and retaining means are lowered Cross-sectional front view when the locking link pair of the retaining means is expanded in diameter Cross-sectional front view when the closing link means and the retaining means are raised to engage the locking link pair in the expanded diameter posture Enlarged sectional front view of the main part when the diameter of the locking link pair of the retaining means is expanded Cross-sectional front view when the elastic annular body of the closing means is elastically deformed to the expanded diameter state Enlarged cross-sectional front view of the main part when the elastic annular body of the closing means is elastically deformed to the expanded diameter state Sectional front view when first presser foot, lid, and gate valve are removed Sectional front view of the branch pipe flow-path shielding apparatus which shows 2nd Embodiment of this invention The expanded sectional view of the principal part of the branch pipe flow-path shielding apparatus which shows 3rd Embodiment of this invention. The expanded sectional view of the principal part of the branch pipe flow-path shielding apparatus which shows 4th Embodiment of this invention. Expanded cross section of elastic ring The expanded sectional view of the principal part of the branch pipe flow-path shielding apparatus which shows 5th Embodiment of this invention. Expanded cross section of elastic ring Cross-sectional front view of a conventional branch pipe channel shielding device

Explanation of symbols

D Preventing means F Reversal preventing means P1 Fluid transport main (water main)
P2 Branch pipe 6 Gate valve 7 Lid 8 First operating shaft 9 Second operating shaft 10 First pressing plate 10C Annular pressing portion 11 Second pressing plate 11C Annular pressing portion 12 Elastic annular body 12a Large diameter central portion 12b End portion 12d Partial spherical outer peripheral surface 12e Partial spherical inner peripheral surface 13 Upstream side locking link 14 Downstream side locking link 20 First connecting part 21 Mounting cylinder 22 Second connecting part 24 Elasticity correction cylinder 45 Elasticity correction ring

Claims (7)

Attached to the downstream end of the branch valve or the end of the pipe part connected to the branch valve so as to close the end opening of the branch pipe that is branched and connected to the main pipe for fluid transportation and the gate is interposed A possible lid, a cylindrical first operating shaft that slidably passes through the lid in the axial direction in a sealed state, and a first slidable through the first operating shaft in the axial direction. Two operating shafts are provided, and between the two pressing plates attached to the inner end sides of the first operating shaft and the second operating shaft, they are brought into close contact with the inner peripheral surface of the branch pipe by sandwiching pressure from the axial direction. An elastic annular body that is elastically deformed into an expanded state and shields between the inner peripheral surface and the outer peripheral portion of both pressing plates is interposed, and further, the pressing located on the inner end side and the upstream side of the second operating shaft In conjunction with the sliding to the outer end side of the second operating shaft with respect to the first operating shaft, between the plate and the portion upstream of the shielding portion by the elastic annular body A branch passage shielding device retaining means is provided with a locking link pair projecting while bent if possible expanded position,
When the locking link pair of the retaining means is extended to a reduced diameter posture, a reverse prevention means is provided for restricting contact with the outer waist folded posture in which the bent pivotal support portion of the locking link pair projects radially outward. The branch pipe channel shielding device.   When the pair of locking links that are extended to a reduced diameter posture reaches a predetermined outer hip folding posture, the inversion prevention means moves the cylindrical elastic correction body in contact with at least one of the locking links to the second operation shaft. The branch pipe flow-path shielding apparatus according to claim 1, wherein the branch pipe flow-path shielding apparatus is configured to be sheathed on the inner end side.   The inversion prevention means extends in a reduced diameter posture to a mounting cylinder that is externally fitted to the inner end side of the second operation shaft and includes a connecting portion that is pivotally connected to the end portion of one of the locking links. The branch according to claim 1 or 2, wherein when the operated locking link pair reaches a predetermined outer hip folding posture, a ring-shaped elastic correction body that comes into contact with one locking link is mounted. Tube channel shielding device.   The branch pipe according to any one of claims 1 to 3, wherein the elastic annular body is configured in a cylindrical shape, and a central portion in the axial direction is configured to have a larger diameter than both ends in the axial direction. Channel shielding device.   The branch pipe flow path shielding device according to claim 4, wherein the outer peripheral surface of the central portion in the axial direction of the elastic annular body is formed as a partial spherical surface whose central position in the axial direction protrudes outward.   The branch pipe according to any one of claims 1 to 5, wherein each of the pressing plates is formed with an annular pressing portion capable of coming into contact with the outer peripheral surfaces of both ends in the axial direction of the cylindrical elastic annular body. Channel shielding device. 6. The branch pipe flow shielding device according to claim 5, wherein the inner peripheral surface of the large-diameter central portion of the elastic annular body is formed as a partial spherical surface whose central position in the axial center direction protrudes most outward.

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