JP2011099514A - Joint structure of valve with pipe, and valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint structure of a valve with a pipe that allows a seal material to be suitably inserted between the outer peripheral face of a spigot and the inner peripheral face of a socket. <P>SOLUTION: A seal material 22 has a base end 24 pressed in the depth direction B of a socket by a pressing ring 23. A recess 27 is formed in the pressing ring 23 to allow the base end 24 of the seal material 22 to be fitted thereinto. The recess 27 includes a pressing surface 28 formed on the bottom to press the base end 24 of the seal material 22 and a tapered constraint surface 29 formed around the pressing surface 28 to constrain the base end 24 of the seal material 22 in the diameter expanding direction C. At least either one of the recess of the pressing ring and the base end of the seal material is provided with a centering means 35 for guiding the pressing ring 23 in a pipe radial direction so that the center of the pressing ring 23 is aligned with a pipe axis 32 while the pressing ring 23 is being moved in the pressing direction B that the pressing ring presses the seal material 22. The centering means 35 includes the constraint surface 29 of the pressing ring 23 and a seal-material-side tapered surface 36 formed on the seal material 22. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a joint structure between a valve and a pipe, and a valve connected to the pipe by the joint structure.

  Conventionally, as a joint structure between this type of valve and pipe, for example, a valve box of a gate valve is provided with a receiving port, an insertion port is provided at the tip of the pipe to be joined, and the insertion port is placed inside the receiving port. There is an inserted configuration.

  FIGS. 17 and 18 illustrate such a joint structure between a valve and a pipe. FIG. 17 shows a state in which a seal material described later is mounted, and FIG. 18 shows a state before the seal material is mounted. Show. Here, the receiving port 2 is formed at the end of the flow path 15 of the valve box 1 of the gate valve, the inserting port 4 is formed at the end of the pipe 3 to be joined, and the inserting port 4 is the receiving port 2. Inserted inside. On the inner periphery of the receiving port 2, a tapered surface 5 a having a diameter that decreases toward the back side from the opening end of the receiving port 2 and a flat surface 5 b that extends from the back end portion of the tapered surface 5 a to the back side of the receiving port 2 with the same diameter. And a lock ring housing groove 6 located on the back side of the receiving port with respect to the seal material housing groove 5 is formed. The valve box 1 and the pipe 3 are made of cast iron.

  The space where the sealing material accommodation groove 5 is provided, that is, the gap between the inner peripheral surface of the receiving port 2 where the sealing material accommodation groove 5 is formed and the outer peripheral surface of the insertion port 4 is made of rubber and is annular. The sealing material (so-called rubber ring) 11 is accommodated. The sealing material 11 is compressed by being pressed to the back side in the receiving port 2 by an annular push ring 12 made of a metal or other rigid body disposed on the outer periphery of a portion of the insertion port 4 that does not enter the receiving port 2. Thus, the space between the inner peripheral surface of the receiving port 2 and the outer peripheral surface of the insertion port 4 is sealed.

  Here, the push wheel 12 has an annular cross-sectional shape extending in a flat plate shape in the tube radial direction (also referred to as a radial direction), and an insertion hole 12a through which a bolt 7 that fastens and supports the push wheel 12 is inserted in the circumferential direction. Are formed at a plurality of locations (for example, two locations). A flange portion 8 is formed on the outer periphery of the end portion of the receiving port 2, and an insertion hole 8 a is formed in the flange portion 8 at a location corresponding to the insertion hole 12 a of the push wheel 12. Then, the bolt 7 is inserted in the tube axis direction from the insertion hole 8 a of the flange portion 8 toward the insertion hole 12 a of the press ring 12, and the nut 9 is screwed to the tip of the screw portion of the bolt 7 to be tightened. Is moved in the direction approaching the flange portion 8, whereby the sealing material 11 is pressed to the back side of the receiving port by the pusher wheel 12 and is accommodated in the sealing material accommodation groove 5 in a press-fitted state.

  The sealing material 11 has a circular tip 11a formed in a circular shape at a position that becomes the tip when the sealing material is press-fitted, and a portion connected to the circular tip 11a is thin-walled, and is thicker toward the push wheel 12 side. The trapezoidal base portion 11b is integrally formed. The sealing material 11 is pressed and press-fitted into the sealing material accommodation groove 5 in a state where the end surface of the base portion 11 b is in contact with the flat surface facing the flange portion 8 of the push wheel 12.

  Further, as shown in FIG. 17, in the conventional joint structure of the valve and the pipe, the bolt 7 is tightened until the predetermined distance M is reached between the pusher wheel 12 and the flange portion 8 so that the pusher wheel 12 is flanged. By maintaining the positional relationship by approaching toward the portion 8, the state in which the seal member 11 is pressed to the back side of the receiving port by the pusher wheel 12 is maintained, and the inner peripheral surface of the receiving port 2 and the outer periphery of the insertion port 4 are maintained. The required sealing function by the sealing material 11 is exerted in close contact with the surface. In FIG. 17 and FIG. 18, reference numeral 10 denotes an annular lock ring that is divided by one in the circumferential direction, and reference numeral 14 denotes an insertion port protrusion formed on the outer periphery of the distal end of the insertion port 4.

  In addition, about the earthquake-resistant gate valve which provided the receiving port as mentioned above is described in the following patent document 1, and the joint structure which inserted the insertion port into the receiving port is described in the following patent document 2.

JP-A-8-270816 JP2003-222276

  However, in the conventional joint structure of the valve and the pipe, as shown in FIG. 18, when the sealing material 11 is pressed to the receiving port back side (arrow direction a in FIG. 18) by the pusher wheel 12, it is shown in FIG. As described above, the base 11b of the sealing material 11 follows the pressing surface of the press ring 12 with the contact portion of the outer peripheral surface of the insertion port 4 and the inner peripheral surface of the receiving port 2 at the circular tip portion 11a of the sealing material 11 as a fulcrum of moment. As shown in FIG. 20, a part of the base portion 11b of the sealing material 11 is finally sandwiched between the pusher wheel 12 and the flange portion 8 as shown in FIG. As a result, the sealing material 11 may not be satisfactorily inserted into the sealing material accommodation groove 5.

  This invention solves the said subject, and provides the joint structure and valve of the valve which can insert a sealing material favorably between the outer peripheral surface of an insertion port, and the inner peripheral surface of a receiving port, and a valve. It is intended.

In order to achieve the above object, according to the first aspect of the present invention, a receiving port is provided in one of a valve and a pipe having a valve box and a valve body for opening and closing a flow path formed in the valve box. The other side is equipped with a mouth,
An insertion slot is inserted inside the receptacle,
An annular sealing material is disposed in the gap between the outer peripheral surface of the insertion port and the inner peripheral surface of the receiving port,
An annular push ring that is externally fitted to the insertion opening and is movable in the tube axis direction faces the opening end of the receiving opening from the outside,
A joint structure of a valve and a pipe that seals between the outer peripheral surface of the insertion port and the inner peripheral surface of the receiving port when the sealing material is pushed into the receiving port by the push ring,
The sealing material has a base end portion that is pressed in the direction toward the back of the receiving port by a push ring,
A depression is formed in the press ring so that the base end of the sealing material is fitted,
The hollow portion has a pressing surface that is formed on the bottom and presses the proximal end portion of the sealing material, and a restraining surface that is formed around the pressing surface and restrains the proximal end portion of the sealing material in the diameter increasing direction,
When the pusher wheel is moving in the push-in direction for pushing in the seal material, the centering means for guiding the pusher wheel in the tube radial direction so that the center of the pusher wheel is aligned with the tube axis is the depression of the push wheel and the base end portion of the seal material And at least one of them.

  According to this, the sealing material and the press ring are fitted into the insertion opening, the base end of the sealing material is fitted into the depression of the pressing ring, the insertion opening is inserted into the receiving opening, and in this state, the press ring is moved in the tube axis direction. Move in the direction of pushing along. Thereby, a sealing material is pushed into the clearance gap between the outer peripheral surface of an insertion port, and the inner peripheral surface of a receiving port with a push ring.

  At this time, since the base end portion of the sealing material is restrained in the diameter increasing direction by the constraining surface of the recess portion, the base end portion of the sealing material moves (deforms) in the diameter increasing direction along the pressing surface of the recess portion. Can be prevented. As a result, the base end portion of the sealing material is not sandwiched between the push ring and the opening end surface of the receiving port (an effect of preventing the sealing material from being caught), and the sealing material is inserted into the outer peripheral surface of the insertion port and the inner peripheral surface of the receiving port. Can be inserted well into the gap.

  In addition, the pusher wheel is guided in the pipe diameter direction by the centering means while moving in the pushing direction, so that the center of the pusher wheel is aligned with the center of the tube and the pusher wheel is automatically centered (automatic centering of the pusher wheel). effect). Thereby, it is possible to save labor for the operator to lift and move the pusher wheel shifted downward from the tube axis by its own weight and move it in the tube radial direction.

In the second invention, the centering means is a constraining surface of the depression of the push ring,
The constraining surface consists of a tapered surface inclined so as to increase in diameter in the pushing direction,
When the pusher wheel is moving in the push-in direction, the restraining surface comes into contact with the proximal end portion of the sealing material to guide the pusher wheel in the pipe radial direction.

  According to this, when the pusher wheel is moved in the pushing direction, the restraint surface comes into contact with the base end portion of the seal material and guides the pusher wheel in the radial direction, so that the center of the pusher wheel is aligned with the tube axis, The wheel is automatically centered.

In the third aspect of the invention, the centering means is a sealing material side tapered surface formed on the outer peripheral edge portion of the base end portion of the sealing material,
The taper surface on the sealing material side is inclined so that the diameter increases in the pushing direction.
When the pusher wheel moves in the pushing direction, the pusher wheel comes into contact with the sealing material side tapered surface and is guided in the pipe radial direction.

  According to this, when the pusher wheel is moved in the pushing direction, the pusher wheel comes into contact with the sealing material side taper surface and is guided in the pipe radial direction, so that the center of the pusher wheel is aligned with the tube axis and automatically The wheel is centered.

In the fourth aspect of the invention, the centering means includes a constraining surface of the depression portion of the push ring and a sealing material side tapered surface formed on the outer peripheral edge portion of the base end portion of the sealing material,
The constraining surface and the sealing material side tapered surface are inclined so as to expand in the pushing direction,
When the pusher wheel is moving in the push-in direction, the restraining surface comes into contact with the sealing material-side tapered surface to guide the pusher wheel in the pipe radial direction.

  According to this, when the pusher wheel is moved in the push-in direction, the restraint surface abuts against the sealing material side taper surface and guides the pusher wheel in the radial direction, so that the center of the pusher wheel is aligned with the tube axis, and automatically The press ring is centered.

In the fifth aspect of the present invention, the inclination angle of the constraining surface with respect to the surface orthogonal to the tube axis is set in the range of 50 ° to 80 °.
According to this, both the effect of preventing the sealing material from being pinched and the effect of automatic centering of the press wheel are reliably exhibited.

In the sixth aspect of the invention, the inclination angle of the sealing material side tapered surface with respect to the surface orthogonal to the tube axis is set in the range of 50 ° to 80 °.
According to this, both the effect of preventing the sealing material from being pinched and the effect of automatic centering of the press wheel are reliably exhibited.

The seventh invention is a valve connected to a pipe by the joint structure according to any one of the first to sixth inventions,
Having a valve box and a valve body for opening and closing a flow path formed in the valve box,
A receiving port is provided in at least one of the flow path end portions of the valve box.

  As described above, according to the present invention, since the base end portion of the sealing material is constrained in the diameter increasing direction by the constraining surface of the recess portion, the base end portion of the sealing material is expanded in diameter along the pressing surface of the recess portion. It is possible to prevent movement (deformation) in the direction, so that the base end portion of the sealing material is not sandwiched between the push ring and the opening end surface of the receiving port, and the sealing material is inserted into the outer peripheral surface of the insertion port. Can be satisfactorily inserted into the gap between the inner peripheral surface of the receptacle.

  Further, the pusher wheel is guided in the pipe radial direction by the centering means while moving in the pushing direction, so that the center of the pusher wheel is aligned with the tube axis and the pusher wheel is automatically centered. As a result, it is possible to save labor for the operator to lift the pusher wheel and move it in the tube diameter direction to center it.

It is a figure which shows the valve joined to the pipe | tube in the 1st Embodiment of this invention. FIG. 2 is a front view of the valve. It is sectional drawing of the joint structure of a valve and a pipe | tube similarly. It is sectional drawing of the sealing material and press ring of a joint structure equally. (A) is a XX arrow line view in Drawing 4 (a), and (b) is a YY arrow line view in Drawing 4 (b). FIG. 4 is a partially enlarged cross-sectional view of the sealing material and the push ring of the joint structure, where (a) shows the inclination angle of the constraining surface and (b) shows the inclination angle of the sealing material side tapered surface. It is sectional drawing which shows the joining procedure of the insertion port of a joint structure, and a receiving port similarly. It is sectional drawing which shows the joining procedure of the insertion port of a joint structure, and a receiving port similarly. It is sectional drawing of the joint structure of the valve and pipe | tube in the reference example of this invention. It is a partial expanded sectional view of the joint structure of the valve and pipe | tube in the 2nd Embodiment of this invention. It is a partial expanded sectional view of the joint structure of the valve and pipe | tube in the 3rd Embodiment of this invention. It is a partially expanded sectional view of the joint structure of the valve and pipe | tube in the 4th Embodiment of this invention. It is sectional drawing of the joint structure of the valve and pipe | tube in the 5th Embodiment of this invention. It is a front view of the press ring of a joint structure. It is sectional drawing of the joint structure of the valve and pipe | tube in the 7th Embodiment of this invention. It is sectional drawing of the joint structure of the valve and pipe | tube in the 8th Embodiment of this invention. It is sectional drawing of the conventional pipe joint. It is sectional drawing which shows the joining procedure of the insertion port of a pipe joint, and a receiving port similarly. It is sectional drawing which shows the problem which may generate | occur | produce when joining the insertion port and receiving port of a pipe joint similarly. It is sectional drawing which shows the problem which may generate | occur | produce when joining the insertion port and receiving port of a pipe joint similarly.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. The same members as those of the conventional one described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIGS. 1 and 2, reference numeral 40 denotes a soft seal gate valve, which is connected to pipes 41 and 42. The gate valve 40 includes a valve box 43 and a valve body 45 that opens and closes a flow path 44 formed in the valve box 43. Receiving ports 2 are provided at both ends of the flow path 44 of the valve box 43. Moreover, the insertion port 4 is provided in the edge part of each pipe | tube 41 and 42, respectively, and the insertion port 4 is inserted in the inside of the receiving port 2, and the joint structure 21 of the gate valve 40 and the pipe | tubes 41 and 42 is comprised. .

Below, the structure of the joint structure 21 is demonstrated.
As shown in FIG. 3, in the joint structure 21, an annular seal material 22 is disposed in a gap between the outer peripheral surface of the insertion port 4 and the inner peripheral surface of the receiving port 2, and is fitted on the insertion port 4. An annular push ring 23 that is movable in the tube axis direction A faces the opening end of the receiving port 2 from the outside, and the sealing member 22 is pushed into the receiving port by the push ring 23 so that the outer peripheral surface of the insertion port 4 and the receiving port The space between the two inner peripheral surfaces is sealed.

  As shown in FIGS. 4A and 5A, the sealing material 22 is made of rubber and formed in an annular shape, and its cross section is formed in a circular shape at a position that becomes a tip when being press-fitted. The circular tip portion 22a and a portion connected to the circular tip portion 22a are thin, and a trapezoidal base portion 22b that is thicker toward the push wheel 23 is integrally formed. Further, the base portion 22 b of the sealing material 22 has a base end portion 24 that is pressed in the receiving port depth direction B by the pusher wheel 23. The inner diameter of the sealing material 22 is set slightly smaller than the outer diameter of the insertion opening 4, and when the sealing material 22 is externally fitted to the insertion opening 4, the inner periphery of the sealing material 22 is pressed against the outer periphery of the insertion opening 4. To do.

  As shown in FIGS. 4B and 5B, the pusher wheel 23 includes an annular portion 23a and an ear portion 23b that protrudes radially outward from the outer periphery of the annular portion 23a. And a plurality of insertion holes 12a through which the bolts 7 are inserted, and a joint surface 31 that contacts the opening end surface 30 of the receiving port 2.

  In addition, the ear | edge part 23b is divided and provided in two places of the push ring 23, and the penetration hole 12a is formed in each ear | edge part 23b. Further, the inner diameter of the central hole portion 26 of the push wheel 23 is set to a value larger than the outer diameter of the insertion opening 4 by a predetermined dimension. In addition, although the ear | edge part 23b is provided in two places of the push ring 23, it is not limited to two places, You may provide in multiple places other than two places.

  Further, on both the front and back surfaces of the pusher wheel 23 in the tube axis direction A, circular recess portions 27 into which the base end portions 24 of the sealing material 22 are fitted are formed. The depression 27 is formed at the bottom and presses the proximal end 24 of the sealing material 22, and is formed around the pressing surface 28 and constrains the proximal 24 of the sealing 22 in the diameter-enlarging direction C. And a constraining surface 29. The pressing surface 28 is formed one step lower than the bonding surface 31.

  By tightening fastening means such as bolts 7 or nuts 9, the center E of the pusher wheel 23 is the tube E when the pusher wheel 23 moves in the pushing direction B (the same direction as the receiving port depth direction B) for pushing the sealing material 22. Centering means 35 for guiding the pusher wheel 23 in the pipe radial direction D is provided so as to fit the shaft center 32. The centering means 35 includes a constraining surface 29 of the recessed portion 27 of the pusher wheel 23 and a sealing material side tapered surface 36 formed on the entire outer periphery of the base end portion 24 of the sealing material 22.

  The constraining surface 29 of the recess 27 on the side facing the receiving port 2 and the sealing material side tapered surface 36 are tapered surfaces that are inclined so as to increase in diameter in the pushing direction B, respectively. As shown in FIG. 6, the inclination angle α of the constraining surface 29 with respect to the surface S perpendicular to the tube axis 32 and the inclination angle β of the sealing material side tapered surface 36 with respect to the surface S are the same angle. Each is set to 60 °. Further, the pressing surface 28 is orthogonal to the tube axis 32. As shown in FIG. 2, the flange portion 8 of the receiving port 2 has the same shape as the push wheel 23.

Hereinafter, the operation of the above configuration will be described.
As shown in FIG. 1, when joining one pipe 41 and the gate valve 40, first, the lock ring 10 is fitted into the lock ring receiving groove 6 in the receiving port 2, and further, as shown in FIG. The sealing material 22 and the push ring 23 are fitted over the insertion opening 4, the base end portion 24 of the sealing material 22 is fitted into one of the depressions 27 of the push ring 23, and the insertion opening 4 is inserted into the receiving opening 2.

  Then, when the insertion projection 14 passes the inner periphery of the lock ring 10 in the receiving port depth direction B, the bolt 7 is inserted into each insertion hole 8a, 12a, and the nut 9 is tightened as shown in FIG. The pusher wheel 23 is moved in the pushing direction B. As a result, as shown in FIG. 3, the sealing material 22 is pushed into the gap between the outer peripheral surface of the insertion port 4 and the inner peripheral surface of the receiving port 2 by the pusher wheel 23 and is accommodated in the sealing material accommodation groove 5.

  At this time, the base end portion 24 of the sealing material 22 is constrained in the diameter expansion direction C by the constraining surface 29 of the one recess portion 27, so that the base end portion 24 of the seal material 22 is brought into contact with the pressing surface 28 of the recess portion 27. It is possible to prevent movement (deformation) along the diameter-enlarging direction C. Thereby, the base end portion 24 of the sealing material 22 is not sandwiched between the joining surface 31 of the pusher wheel 23 and the opening end face 30 of the receiving port 2 (effect of preventing the sealing member 22 from being caught), and the joining surface of the pusher wheel 23 is prevented. 31 makes contact (surface contact) with the opening end surface 30 of the receiving port 2 so that the sealing material 22 can be satisfactorily inserted into the sealing material accommodation groove 5, and as shown in FIG. The valve 40 is joined.

  In the joining procedure as described above, as shown in FIG. 7, when the sealing material 22 and the pusher wheel 23 are externally fitted to the insertion opening 4, the center of the pusher wheel 23 is lower than the tube axis 32 due to its own weight. A gap 37 between the inner periphery of the central hole portion 26 of the push wheel 23 and the outer periphery of the insertion slot 4 in the radial direction D is minimum (= 0) at the upper end portion and is maximum at the lower end portion.

  When the pusher wheel 23 is moved in the pushing direction B by tightening the nut 9 in this state, the restraint surface 29 of the pusher wheel 23 comes into contact with the sealing material side tapered surface 36 of the sealing material 22 as shown in FIG. Guided in the tube diameter direction D. Thereby, the pusher wheel 23 rises with respect to the insertion opening 4, the center of the pusher wheel 23 is aligned with the tube axis 32, and the pusher wheel 23 is automatically centered (automatic centering effect of the pusher wheel 23). As shown in FIG. 1, one pipe 41 and the gate valve 40 are joined. Thereby, it is possible to save the labor for the operator to lift the push wheel 23 and move it in the pipe diameter direction D for centering.

Moreover, joining of the other pipe | tube 42 and the gate valve 40 can also be performed similarly to the above.
A joint structure 71 of the gate valve 40 and the pipes 41 and 42 shown in FIG. 9 is a reference example for the first embodiment, and does not include the centering means 35. That is, the sealing material side tapered surface 36 is not formed at the base end portion 24 of the sealing material 22, and the restraining surface 29 of the hollow portion 27 of the push ring 23 is not a tapered surface but is orthogonal to the pressing surface 28. .

  According to this, as shown in FIG. 9A, before tightening the nut 9, the operator lifts the pusher wheel 23 with respect to the insertion opening 4 and moves the base end portion 24 of the sealing material 22 to the pusher wheel 23. There is a problem that it is necessary to fit in the hollow portion 27 and the burden on the operator increases. In the said 1st Embodiment, such a worker's burden can be eased.

(Second Embodiment)
In the first embodiment, as shown in FIG. 4, the centering means 35 is formed on the constraining surface 29 formed in a tapered shape on the hollow portion 27 of the push ring 23 and on the base end portion 24 of the sealing material 22. In the second embodiment, as shown in FIG. 10, the sealing material side tapered surface 36 is not formed on the sealing material 22, and the centering means 35 is tapered. You may comprise only the constraining surface 29. FIG. Note that the inclination angle α (see FIG. 6A) of the constraining surface 29 is set to 60 °, as in the first embodiment.

According to this, when the pusher wheel 23 moves in the pushing direction B by tightening the nut 9, the restraining surface 29 of the pusher wheel 23 comes into contact with the base end portion 24 of the sealing material 22 and is guided in the pipe diameter direction D.
(Third embodiment)
In the first and second embodiments, the constraining surface 29 is formed in a tapered shape over the entire surface. However, as shown in FIG. 11, the constraining surface 29 is a pressing surface 28 as a third embodiment. And a tapered portion 29b that is inclined so as to increase in diameter in the pushing direction B (joining surface 31 side). The straight portion 29 a is located on the back side of the recessed portion 27, and the tapered portion 29 b is formed from the straight portion 29 a to the joining surface 31. Note that the inclination angle α of the tapered portion 29b of the constraining surface 29 is set to 60 °, as in the first embodiment.

  According to this, when the pusher wheel 23 is moved in the pushing direction B by tightening the nut 9 as shown in FIG. 11A, the taper portion 29 b of the restraining surface 29 of the pusher wheel 23 is the base end portion of the sealing material 22. 24 and is guided in the tube diameter direction D. As a result, as shown in FIG. 11B, the pusher wheel 23 rises with respect to the insertion slot 4, the center of the pusher wheel 23 is aligned with the tube axis 32, and the pusher wheel 23 is automatically centered. As shown in (c), the base end portion 24 of the sealing material 22 is fitted inside the straight portion 29a of the restraining surface 29, and in this state, the one pipe 41 and the gate valve 40 are joined.

  Further, as shown in FIG. 11C, the base end portion 24 of the sealing material 22 is fitted inside the straight portion 29 a of the restraining surface 29, so that the base end portion 24 of the sealing material 22 is The straight portion 29a is reliably restrained in the diameter expansion direction C. For this reason, it can prevent reliably that the base end part 24 of the sealing material 22 moves to the diameter-expanding direction C along the pressing surface 28 of the hollow part 27 (deformation).

(Fourth embodiment)
As a fourth embodiment, as shown in FIG. 12, the constraining surface 29 is not tapered, but is straight and orthogonal to the pressing surface 28, and the centering means 35 is composed of only the sealing material side tapered surface 36. May be. The inclination angle β (see FIG. 6B) of the sealing material side tapered surface 36 is set to 60 °, as in the first embodiment.

  According to this, when the pusher wheel 23 moves in the pushing direction B by tightening the nut 9, the corner portion 38 between the restraining surface 29 and the joint surface 31 of the pusher wheel 23 comes into contact with the taper surface 36 on the sealing material side and the pipe diameter is increased. Guided in direction D.

(Fifth embodiment)
As a fifth embodiment, as shown in FIGS. 13 and 14, a spacer 40 (protrusion) protruding in the tube axis direction A may be provided on the joint surface 31 of the pusher wheel 23. The spacers 40 are provided at four positions every 90 ° in the circumferential direction. In addition, it is not limited to four places, Multiple places other than four places may be sufficient.

  According to this, when one pipe 41 and the gate valve 40 are joined, the tip of each spacer 40 of the pusher wheel 23 comes into contact with the opening end surface 30 of the flange portion 8 of the receiving port 2. As a result, a predetermined gap 47 is formed between the end face of the push wheel 23 and the opening end face 30 of the receiving port 2, and the mounting state of the sealing material 22 (particularly the base end portion 24) is visually confirmed through this gap 47. be able to.

(Sixth embodiment)
In the first embodiment, as shown in FIG. 6, the inclination angle α of the constraining surface 29 and the inclination angle β of the sealing material side taper surface 36 are set to 60 °, respectively, but the sixth embodiment As above, the inclination angles α and β may be set in the range of 50 ° to 80 °.

  Table 1 below shows the experimental results showing whether or not the sealing material 22 has a pinching prevention effect with respect to the inclination angles α and β and whether or not the push ring 23 has an automatic centering effect. In addition, as described in the first embodiment, the effect of preventing the sandwiching of the sealing material 22 is that the base end portion 24 of the sealing material 22 is formed between the joint surface 31 of the push ring 23 and the opening end surface 30 of the receiving port 2. This is an effect that can be prevented from being sandwiched between them. Further, the automatic centering effect of the pusher wheel 23 is an effect that the pusher wheel 23 rises with respect to the insertion slot 4 and is automatically centered as described in the first embodiment.

  According to Table 1 below, by setting each of the inclination angles α and β in the range of 50 ° to 80 °, both the sandwiching prevention effect of the sealing material 22 and the automatic centering effect of the press ring 23 are surely exhibited. .

  When the inclination angles α and β are less than 50 °, the restraining function of the restraining surface 29 with respect to the base end portion 24 of the sealing material 22 is insufficient, and the base end portion 24 of the sealing material 22 slips on the restraining surface 29. It becomes easy to move (deform) in the diameter expansion direction C. When the inclination angles α and β exceed 80 °, the amount by which the pusher wheel 23 rises with respect to the insertion opening 4 is insufficient, and the center of the pusher wheel 23 does not coincide with the tube axis 32.

  Although the inclination angle α of the constraining surface 29 and the inclination angle β of the sealing material side tapered surface 36 are the same, they may be different in the range of 50 ° to 80 °.

同様に、上記第２の実施の形態では、拘束面２９の傾斜角度αを６０°に設定したが、上記第６の実施の形態と同様な根拠に基づいて、上記傾斜角度αを５０°〜８０°の範囲に設定してもよい。

Similarly, in the second embodiment, the inclination angle α of the constraining surface 29 is set to 60 °. However, based on the same grounds as in the sixth embodiment, the inclination angle α is set to 50 ° to 50 °. You may set to the range of 80 degrees.

  Similarly, in the third embodiment, the inclination angle α of the tapered portion 29b of the constraining surface 29 is set to 60 °. However, the inclination angle α is based on the same grounds as in the sixth embodiment. May be set in the range of 50 ° to 80 °.

  Similarly, in the fourth embodiment, the inclination angle β of the sealing material-side tapered surface 36 is set to 60 °. However, based on the same grounds as in the sixth embodiment, the inclination angle β is set to You may set in the range of 50 degrees-80 degrees.

(Seventh embodiment)
In the said 1st Embodiment, although the hollow part 27 was formed in the front and back both surfaces in the pipe-axis direction A of the press ring 23, as shown in FIG. 15, as shown in FIG. It may be formed only on one side. Similarly, in each of the embodiments other than the first embodiment, the recessed portion 27 may be formed only on one surface of the push wheel 23.

(Eighth embodiment)
In each of the above embodiments, as shown in FIG. 1, the gate valve 40 in which the receiving ports 2 are provided at both ends of the flow path 44 of the valve box 43 is shown. However, as an eighth embodiment, FIG. As shown, the gate valve 40 may be provided with the receiving port 2 at one end of the flow path 44 and the insertion port 50 at the other end. In this case, the insertion port 50 of the gate valve 40 has the same configuration as the insertion port 4 of one pipe 41. The receiving port 51 provided at the end of the other tube 42 has the same structure as the receiving port 2 of the gate valve 40, and the insertion port 50 of the gate valve 40 is inserted into the port 51 of the other tube 42. The joint structure 52 configured as described above has the same configuration as the joint structure 21 in each of the above embodiments.

  In each of the above embodiments, two insertion holes 8a and 12a are formed in the flange portion 8 and the press ring 23 of the receiving port 2 respectively, and the press ring 23 is connected to the receiving port 2 with two bolts 7. Three or more insertion holes 8 a and 12 a may be formed and connected by three or more bolts 7.

In each of the above-described embodiments, the hexagon bolt 7 is used as an example of the fastening means, but is not limited to the hexagon bolt 7, and for example, a T-type bolt or the like may be used.
In each said embodiment, although the gate valve 40 was mentioned as an example of a valve, valves of types other than the gate valve 40 may be sufficient.

2 Receptacle 4 Insertion 21 Joint Structure 22 Sealing Material 23 Push Wheel 24 Base End 27 Depression 28 Pressing Surface 29 Constraining Surface 32 Tube Axial Center 35 Centering Means 36 Sealing Material Side Tapered Surface 40 Gate Valve 41, 42 Tube 43 Valve Box 44 Flow path 45 Valve body A Pipe axis direction B Receptor back direction, push-in direction C Expanding direction D Pipe diameter direction E Center of pusher wheel S Surface orthogonal to tube axis center Angle of constraining surface β Seal material side taper Face tilt angle

Claims (7)

The valve box and the valve having a valve body that opens and closes the flow path formed in the valve box and the pipe are provided with a receiving port and the other is provided with an insertion port,
An insertion slot is inserted inside the receptacle,
An annular sealing material is disposed in the gap between the outer peripheral surface of the insertion port and the inner peripheral surface of the receiving port,
An annular push ring that is externally fitted to the insertion opening and is movable in the tube axis direction faces the opening end of the receiving opening from the outside,
A joint structure of a valve and a pipe that seals between the outer peripheral surface of the insertion port and the inner peripheral surface of the receiving port when the sealing material is pushed into the receiving port by the push ring,
The sealing material has a base end portion that is pressed in the direction toward the back of the receiving port by a push ring,
A depression is formed in the press ring so that the base end of the sealing material is fitted,
The hollow portion has a pressing surface that is formed on the bottom and presses the proximal end portion of the sealing material, and a restraining surface that is formed around the pressing surface and restrains the proximal end portion of the sealing material in the diameter increasing direction,
When the pusher wheel is moving in the push-in direction for pushing in the seal material, the centering means for guiding the pusher wheel in the tube radial direction so that the center of the pusher wheel is aligned with the tube axis is the depression of the push wheel and the base end portion of the seal material And a joint structure of a valve and a pipe, wherein the joint structure is provided on at least one of them. The centering means is a constraining surface of the depression of the push ring,
The constraining surface consists of a tapered surface inclined so as to increase in diameter in the pushing direction,
2. The valve-pipe joint structure according to claim 1, wherein when the press ring moves in the push-in direction, the restraining surface abuts on a base end portion of the sealing material to guide the press ring in the pipe radial direction. . The centering means is a sealing material side tapered surface formed at the outer peripheral edge of the base end of the sealing material,
The taper surface on the sealing material side is inclined so that the diameter increases in the pushing direction.
2. The joint structure of a valve and a pipe according to claim 1, wherein the pusher wheel is guided in the pipe radial direction while abutting against the sealing material side taper surface when moving in the pushing direction. The centering means consists of a constraining surface of the depression portion of the push ring and a sealing material side tapered surface formed on the outer peripheral edge of the base end portion of the sealing material,
The constraining surface and the sealing material side tapered surface are inclined so as to expand in the pushing direction,
2. The valve / pipe joint structure according to claim 1, wherein when the pusher wheel moves in the push-in direction, the restraining surface abuts on the sealing material side tapered surface to guide the pusher wheel in the pipe radial direction. The joint structure of a valve and a pipe according to claim 2 or 4, wherein an inclination angle of the constraining surface with respect to a plane orthogonal to the pipe axis is set in a range of 50 ° to 80 °. 5. The joint structure between a valve and a pipe according to claim 3 or 4, wherein an inclination angle of the taper surface on the sealing material side with respect to a surface orthogonal to the tube axis is set in a range of 50 ° to 80 °. . A valve connected to a pipe by the joint structure according to any one of claims 1 to 6,
Having a valve box and a valve body for opening and closing a flow path formed in the valve box,
A valve characterized in that a receiving port is provided in at least one of flow path end portions of the valve box.

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