JP2008151323A - Resin tube embedded type valve and connection construction of valve and resin tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To align the axis of a valve in the tube axis direction with the axis of a resin tube without complicating structure. <P>SOLUTION: The tip 11 of the resin tube 10 can be inserted in a receptacle 5 for the connection of a valve box 2 of the valve 1, and an annular protrusion 12 is formed on the outer circumference of the tip 11. The outer circumference of the tip 11 is brought into contact with the inner circumference of the receptacle 5 for connection over the whole circumference, and the annular protrusion 12 abuts on the front end 5a of the receptacle 5 for connection in an insertion state. A hook 6 radially projecting outward is provided around the circumference of the receptacle 5 for connection, and the front end 15a of a tubular fastening member 15 is hooked on the annular protrusion 12. The rear end 15b and the hook 6 are fastened and fixed with a bolt 17 and the nut 18 to bring the annular protrusion 12 into press-contact with the front end 5a. The axes P<SB>2</SB>, P<SB>1</SB>of the receptacle 5 for connection and the resin tube 10 can be fixed to each other with the fastening member 15 so that the axes P<SB>2</SB>, P<SB>1</SB>can be easily aligned without complicating structure. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a connection structure between a resin pipe and a valve when the valve is attached to a resin pipe such as a vinyl chloride pipe or a polyethylene pipe used for a water pipe or the like.

  For example, as shown in Patent Document 1, a conventional connection structure between a resin pipe and a valve has metal connection portions opened at both ends of the valve box of the valve, and a resin tube can be connected to each of the connection portions. It has become.

  The outer periphery of the connecting portion is formed in a tapered shape that gradually increases in diameter as it approaches the center side of the valve box. There is a configuration in which the connection portion is fitted and pushed into the inner diameter portion of the resin tube, and the outer periphery of the pushed resin tube is tightened to the inner diameter side with a wedge-shaped push ring. Since the material of the resin tube is flexible, if the distal end portion is pushed into the connection portion of the valve, the resin tube expands in the radial direction and can be easily connected (see, for example, Patent Document 1).

  Further, the connection structure between the resin pipe and the valve shown in FIG. 5 is an annular shape that extends around the outer periphery of the distal end portion 27 of the resin pipe 21 connected to the butterfly valve type valve 20 having the valve shaft 24 and the valve body 23. The projection 22 is formed, and the tip 27 thereof is inserted into the connection receptacle of the valve 20. The outer periphery of the annular protrusion 22 is in close contact with the inner periphery of the connection port of the valve 20, and a retaining ring 25 is provided in the gap between the inner periphery of the connection port and the outer periphery of the resin tube 21 toward the center of the valve box. It is the structure which screwed.

  Since the retaining ring 25 is screwed into a screw groove formed in the inner periphery of the connection receiving port of the valve 20, the resin tube 21 is pressed toward the center side of the valve box of the valve 20 by the screwing, and both are watertight. It fixes to a connection state (for example, refer patent document 2).

JP-A-10-89515 JP 2004-176758 A

According to the connection structure described in Patent Document 1, it is difficult to fix the valve in a state in which the axis of the opening of the valve is aligned with the axis of the resin pipe. This is because when the resin tube is fitted into a metal valve, the resin tube is screwed in while being elastically deformed or plastically deformed. Because it is difficult.
In addition, since the push wheel has a wedge-shaped cross section, if the tightening degree is not uniform in the circumferential direction, the shaft center of the valve opening and the shaft center of the resin pipe connected thereto may not coincide with each other. .

  Thus, if the axial center of the valve opening and the axial center of the resin pipe connected thereto do not match, not only the appearance of the pipe line is bad, but also a support for holding the axial center (such as a jack) ) Is required, the workability of the piping deteriorates. Further, there is a problem that the direction of the pipe line is not constant with respect to the valve, which is not preferable.

  Further, according to the connection structure described in Patent Document 2, since the inner periphery of the opening (the connection receiving port) of the valve 20 is a cylindrical surface, when the resin tube 21 is inserted into the opening, the resin It can be said that the tube 21 hardly undergoes elastic deformation or plastic deformation.

However, when screwing the retaining ring 25 for fixing, the accuracy of the thread groove on the outer periphery of the retaining ring 25 and the thread groove of the valve 20 becomes a problem. Forming a thread groove on the inner periphery of the opening of the valve is a complicated operation, and increasing the accuracy by fixing the uneven depth of the thread groove and the radial position of the thread groove with respect to the center of the tube axis leads to an increase in cost. .
If the accuracy of both screw grooves is low (if the dimensional error of the screw grooves is large), the retaining ring cannot be accurately positioned in the radial direction when meshing. If the axial center of the retaining ring is displaced in the radial direction with respect to the axial center of the connecting portion, it is difficult to match the axial center of the connecting portion of the valve and the resin pipe.

  Furthermore, since a dedicated tool is required for screwing the retaining ring, a simpler connection structure is desired.

  Accordingly, an object of the present invention is to provide a connection structure in which the axial center of the valve axis direction of the valve and the axial center of the resin pipe connected thereto can be easily matched without complicating the structure.

  In order to solve the above-described problems, the present invention provides a connection receptacle in a valve box of a valve, allows a distal end portion of a resin tube to be inserted into the connection receptacle, and provides an annular protrusion on an outer periphery of the distal end portion. In the state where the tip is inserted into the connection receptacle, the outer peripheral surface of the tip is in contact with the inner peripheral surface of the connection receptacle over the entire circumference, and the annular protrusion is connected to the connection receptacle. A locking portion is provided around the connection receiving port, and the outer peripheral surface of the connection receiving port and the outer peripheral surface of the annular protrusion are covered with a cylindrical fastening member. The front end portion of the fastening member is locked to the annular protrusion and the rear end portion is fixed to the locking portion, whereby the annular protrusion is brought into pressure contact with the front end surface of the connection receiving port. The structure which connects the said resin pipe was employ | adopted.

  If it does in this way, if a resin pipe is inserted in the connection receptacle of a valve box and a cylindrical fastening member (mounting ring) is inserted along a pipe in that state, a connection receptacle and a resin pipe Both of them can be fixed in a state where the axis centers coincide with each other. For this reason, it can be set as the structure which is easy to make the axial center of the pipe-axis direction of a valve | bulb and the axial center of the resin pipe connected to it correspond, without making a structure complicated.

In the above-described configuration, the fastening member can be fixed to the rear end portion of the fastening member using a well-known technique such as screw fixing, caulking fixing, and fitting fixing. The protruding portion provided at the rear end portion of the fastening member is opposed to the engaging portion of the connecting receiving port and is opposed to the outer peripheral surface of the connecting receiving port. It is possible to employ a configuration in which the protruding portion and the locking portion are tightened in the tube axis direction with bolts and nuts.
In this way, since the valve and the resin pipe can be fixed using general bolts and nuts, a dedicated tool or the like is unnecessary. In addition, since the valve and the resin pipe can be connected to the cylindrical fastening member via bolts and nuts, the number of parts can be reduced, the connection structure can be simplified, and the fixing work is easy.

Further, the locking portion is positioned symmetrically across a vertical line passing through the axial center of the connection receiving port in a state where the valve is laid on a horizontal ground, and a pair of symmetrical arrangements sandwiching the vertical line. The structure which supports the said valve | bulb on the ground can be employ | adopted when an engaging part contacts the said ground, respectively.
In this way, the pair of locking portions provided on the valve box side are in contact with the ground on both sides across the vertical line, so that the valve can be prevented from tipping during and after the connection of the resin pipe. obtain.
Further, since the pair of locking portions provided on the valve box side are in contact with the ground on both sides of the vertical line, the valve box is stably placed at a predetermined position on the ground. For this reason, if the resin tube is inserted into the connection receiving port when the valve box and the resin tube are connected, the radial position of the resin tube can be determined based on the position of the valve box. Therefore, installation of a fixing base (supporting base) for temporarily receiving the resin pipe can be made unnecessary.

  Furthermore, the structure of the resin pipe built-in type | mold valve using the connection structure of the valve | bulb and resin pipe which consist of one of the said structures is employable. If the valve is provided as a unit in which the resin pipe is connected to the valve, it is possible to avoid the work of connecting the valve and the resin pipe at the site where the pipe line is laid.

  The resin tube built-in type valve has a connection receptacle on the valve box of the valve, a locking portion is provided around the connection receptacle, and the tip of the resin tube is inserted into the connection receptacle. By doing so, the outer peripheral surface of the tip end part is in contact with the inner peripheral surface of the connection receptacle over the entire circumference, and the annular projection provided on the outer periphery of the tip end part is in contact with the front end face of the connection receptacle, The outer peripheral surface of the connection receiving port and the outer peripheral surface of the annular protrusion are covered with a cylindrical fastening member, and the front end portion of the fastening member is locked to the annular protrusion and the rear end portion is used as the locking portion. By fixing, the annular protrusion is brought into pressure contact with the front end surface of the connection receiving port to connect the valve and the resin pipe, and the other end of the connected resin pipe is connected to another resin pipe. It is a configuration that can be connected.

  The present invention can provide a connection structure in which the axis in the tube axis direction of the valve and the axis of the resin pipe connected thereto can be easily matched without complicating the structure.

  An embodiment will be described with reference to the drawings. In this embodiment, as shown in FIG. 1, connection receptacles 5 and 5 having a circular cross section are provided at both ends of a valve box 2 of a gate valve (valve) 1, and in each of the connection receptacles 5 and 5, It is a resin pipe built-in type gate valve in which a polyethylene pipe (resin pipe) 10 having a circular cross section made of a straight pipe having a predetermined length is connected.

  In the structure of the gate valve 1, a valve shaft 4 penetrating the inside and outside of the valve box 2 is fixed, and a valve body 3 is provided at the lower end of the valve shaft 4. By rotating the operating portion provided at the upper end of the valve shaft 4, the valve body 3 moves up and down in the valve chamber of the valve box 2 to open and close the flow path of the valve chamber.

  The connection receiving port 5 is an opening communicating with the valve chamber in which the valve body 3 is accommodated, and the inner peripheral cylindrical surface 5b is directed from the front end surface 5a toward the rear side (side closer to the center of the valve box 2). And the diameter is reduced at a step portion provided at the rear end of the inner peripheral cylindrical surface 5b. The step portion is formed with a back end surface 5c in the direction perpendicular to the tube axis that faces the front end surface 5a.

  Further, the connection receiving port 5 is formed with an outer peripheral cylindrical surface from the front end surface 5a toward the rear side, and a locking portion 6 is provided at the rear end of the outer peripheral cylindrical surface. As shown in FIG. 1 (b), the locking portion 6 is formed so as to protrude radially outward from the outer peripheral cylindrical surface, and the locking portion 6 is divided into four locations along the circumferential direction. Is provided. Each locking portion 6 is provided with a bolt insertion hole 6a parallel to the tube axis direction.

  A groove is formed on the tip 11 of the resin tube 10 over the entire circumference, and a packing 19 is fitted in the groove. Since the inner diameter of the inner peripheral cylindrical surface 5 b of the connection receiving port 5 is substantially the same as the outer diameter of the distal end portion 11 of the resin tube 10, the distal end portion 11 of the resin tube 10 is inserted into the connection receiving port 5. Then, the inner peripheral cylindrical surface 5b and the outer peripheral cylindrical surface 14b are in close contact with each other over the entire circumference. Further, the presence of the packing 19 maintains the water tightness between the inner and outer cylindrical surfaces 5b and 14b.

  An annular protrusion 12 is provided on the outer periphery of the tip portion 11. The annular protrusion 12 is provided outside the insertion portion of the distal end portion 11 of the resin tube 10 into the connection receiving port 5 and continuously provided over the entire circumference thereof. Further, the outer periphery of the annular protrusion 12 is a cylindrical surface, and both axial end surfaces 12a and 12b are surfaces perpendicular to the tube axis direction.

When the distal end portion 11 of the resin pipe 10 is inserted into the connection receiving port 5 and the resin pipe 10 is pushed further toward the center side of the valve box 2, the end surface 12 a of the annular protrusion 12 is moved to the connection receiving port. It abuts on the front end face 5a of the mouth 5.
At the same time, if the size and shape are set so that the end surface 14a at the tip of the resin tube 10 abuts on the back end surface 5c, the axis of the connection receiving port 5 of the valve box 2 and the axis of the resin tube 10 It is more advantageous to match the two, and the connection can be made stronger.
1 is a metal sleeve that reinforces the resin tube 10. In FIG. 2, the illustration of the sleeve 7 is omitted.

  In a state in which the distal end portion 11 of the resin tube 10 is inserted into the connection receiving port 5, a metal cylindrical fastening that covers the outer peripheral cylindrical surface of the connection receiving port 5 and the outer peripheral cylindrical surface of the annular protrusion 12. An attachment member (mounting ring) 15 is provided. A slight gap is provided between the outer peripheral cylindrical surface of the connection receiving port 5 and the outer peripheral cylindrical surface of the annular protrusion 12 and the inner peripheral cylindrical surface of the fastening member 15.

As shown in FIGS. 2 and 4, the fastening member 15 has a front end portion 15 a provided with a flange portion that is directed radially inward over the entire circumference, and the front end of the flange portion is formed in the annular shape. The projection 12 is engaged with the end surface 12b.
Further, the rear end portion 15b is provided with a protruding portion 16 facing the locking portion 6 provided on the valve box 2 side. The protruding portion 16 protrudes radially outward from the outer peripheral surface of the fastening member 15, and the protruding portion 16 is provided in four equal azimuth directions along the circumferential direction. Each protrusion 16 is provided with a bolt insertion hole 16a parallel to the tube axis direction.

The flange portion of the front end portion 15a of the tightening member 15 is locked to the annular protrusion 12, and the protruding portion 16 of the rear end portion 15b of the tightening member 15 and the locking portion 6 are connected to the bolt insertion hole 16a. , 6a, and the bolts 17, the nuts 18 and the washers 18a are tightened to fix the protruding portions 16 and the locking portions 6 in close contact with each other.
With this fixing, the connection receiving port 5 of the gate valve 1 and the resin pipe 10 are in a state in which the end surface 12a of the annular protrusion 12 is in pressure contact (contact with pressure) with the front end surface 5a of the connection receiving port 5. And are connected.

  The end 13 of the resin pipe 10 opposite to the tip 11 can be connected to another resin pipe 10 by a well-known method at the site of laying the pipe.

The operation for connecting the resin pipe 10 to the gate valve 1 will be described. First, the tip 11 of the resin pipe 10 is inserted into the connection port 5 of the gate valve 1. Thereafter, the fastening member 15 is inserted from the opposite end 13 side of the resin pipe 10 in the direction of the arrow shown in FIG.
The tightening member 15 is rotated in the circumferential direction so that the locking portion 6 of the valve box 2 and the protruding portion 16 of the tightening member 15 are adjusted so as to face each other along the tube axis direction.
When the bolt 17 is inserted into the bolt insertion holes 6a, 16a of the locking portion 6 and the protruding portion 16 and the nut 18 is tightened via the washer 18a, the flange portion of the front end portion 15a is locked to the annular protrusion 12. Then, the resin pipe 10 is drawn toward the center side of the valve box 2. When the nut 18 is further tightened so that the locking portion 6 and the projecting portion 16 come into close contact with each other, the end surface 12a of the annular protrusion 12 comes into pressure contact with the front end surface 5a of the connection receiving port 5, and the connection operation is completed. Further, the same operation is performed on the other connection receiving port 5 provided in the valve box 2.

In this way, if the resin tube 10 is inserted into the connection receiving port 5, the fastening member 15 is fitted on the outer periphery thereof, and the gate valve 1 and the resin tube 10 are fixed via the fastening member 15, it is easy. the axis P ₁ of the axis P ₂ and the resin tube 10 of the connecting socket 5 can be matched, it is possible that both axis P _2, P ₁ is fixed both to the state that matches.

In this connection work, as shown in FIG. 1 (b), the gate valve 1 is laid on the horizontal ground G, and is located at least below the engaging portion 6 provided in the valve box 2. The pair of locking portions 6, 6 are symmetrically located across the vertical line v passing through the axis P ₂ of the connection receiving port 5, and the pair of locking portions 6, symmetrically arranged across the vertical line v, are located. 6 is in contact with the ground G, thereby supporting the gate valve 1 on the ground G. For this reason, the gate valve 1 is maintained without falling down, and the connection operation of the resin pipe 10 can be performed smoothly.
Moreover, since the protrusion 16 of the tightening member 15 has a shape corresponding to the shape of the locking portion 6 of the valve box 2 (see FIG. 2), the protrusion 16 of the tightening member 15 becomes the ground G. There will be no hindrance.

  Furthermore, if the outer shape of the locking portion 6 and the protruding portion 16 is set to a shape that perfectly matches at least a part thereof, the two bolt insertion holes 6a, 16a facing each other can be obtained by matching the outer shapes of the two. The position matches. For this reason, the circumferential positioning of the locking portion 6 and the protruding portion 16 is facilitated, and the bolts 17 can be easily inserted into the opposing bolt insertion holes 6a and 16a. When making a part of the outer shape of the locking portion 6 and the protruding portion 16 coincident (the same shape), for example, as shown in FIGS. If each tip portion has an arcuate shape, it is easy to visually recognize that the outer shapes of both ends are exactly matched.

  In this embodiment, the flange portion of the front end portion 15a of the tightening member 15 is continuously provided on the entire circumference along the circumferential direction, but the flange portion is provided intermittently along the circumferential direction. There is no problem. Further, the means for locking the front end portion 15a of the tightening member 15 to the annular protrusion 12 may have a configuration other than the flange portion. For example, a projection or the like that can be locked to the annular projection 12 of the resin tube 10 may be provided on the front end portion 15 a of the fastening member 15.

Moreover, in this embodiment, although the latching | locking part 6 of the valve box 2 and the protrusion part 16 of the clamping member 15 were provided in four places along the circumferential direction, respectively, the number of the installation places and the installation azimuth | direction are provided. Can be set freely. Moreover, you may make it the flange shape which provides the adjacent latching | locking parts 6 and the protrusion parts 16 continuously, and extends along the circumferential direction. However, in the case of expecting the effect of preventing the valve box 2 from falling, it is desirable that the pair of symmetrically arranged locking portions 6 and 6 sandwiching the vertical line v are in contact with the ground G. It is desirable that the shape of each protrusion 16 corresponding to the pair of locking portions 6, 6 is a shape that touches the ground G as well as the pair of locking portions 6, 6 or does not interfere with the ground G. .
Further, when the locking portion 6 and the protruding portion 16 are fastened and fixed by the bolt 17 and the nut 18, the positions thereof are set so that the bolt insertion holes 6 a and 16 a face each other.
Note that a fixing method other than the bolt 17 and the nut 18 can be adopted as a means for fixing the locking portion 6 and the protruding portion 16.

A configuration is also conceivable in which the inner peripheral cylindrical surface of the fastening member 15 and the outer peripheral cylindrical surface of the annular protrusion 12 of the resin tube 10 and the outer peripheral cylindrical surface of the connection receiving port 5 are closely attached without providing a gap.
According to this configuration, the tightening member 15 can restrain the connection receiving port 5 and the resin tube 10 from the outer peripheral side without a gap.

Furthermore, in this embodiment, the gate valve 1 is employed as the valve 1, but the valve 1 of the present invention can also employ a connection structure between the valve and the resin pipe of the present invention, for example, a butterfly valve It may be a type of valve.
Further, the present invention can be carried out even if the cross-sectional shape of the connection receiving port 5, the resin tube 10, and the fastening member 15 covering them in the direction perpendicular to the tube axis is another shape.

An embodiment is shown, (a) is a front view, (b) is a side view. Exploded perspective view of the same embodiment Partial cut front view of resin pipe Detailed view of tightening member Front view of conventional example

Explanation of symbols

1 Valve (gate valve)
2 Valve box 3 Valve body 4 Valve shaft 5 Connection port 6 Locking portion 7 Sleeve 10 Resin pipe 11 End portion 12 Annular projection 15 Tightening member 16 Protruding portion 17 Bolt 18 Nut 19 Packing

Claims (4)

  The connection box 5 is provided in the valve box 2 of the valve 1, the tip portion 11 of the resin tube 10 can be inserted into the connection port 5, and the annular protrusion 12 is provided on the outer periphery of the tip portion 11. In a state where the distal end portion 11 is inserted into the connection receiving port 5, the outer peripheral surface of the distal end portion 11 is in contact with the inner peripheral surface of the connection receiving port 5 over the entire circumference, and the annular protrusion 12 is used for the connection. The front end surface 5a of the receiving port 5 is abutted, and a locking portion 6 is provided around the connecting receiving port 5, and the outer peripheral surface of the connecting receiving port 5 and the outer peripheral surface of the annular protrusion 12 are provided. The annular projection 12 is covered with a cylindrical fastening member 15, and the front end portion 15 a of the fastening member 15 is locked to the annular projection 12 and the rear end portion 15 b is fixed to the locking portion 6. The valve 1 and the resin pipe 10 are brought into contact with each other by being brought into pressure contact with the front end surface 5 a of the connection receiving port 5. Connection structure between the valve and the resin tube.   The locking portion 6 protrudes radially outward from the outer peripheral surface of the connection receiving port 5, and the fastening between the rear end portion 15 b of the fastening member 15 and the locking portion 6 is performed by the rear end portion. The projecting portion 16 provided on 15b faces the locking portion 6, and the projecting portion 16 and the locking portion 6 facing each other are fastened in the tube axis direction with a bolt 17 and a nut 18. Connection structure of the described valve and resin pipe.   The locking portion 6 is positioned symmetrically with a vertical line v passing through the axial center of the connection receiving port 5 in a state where the valve 1 is laid on a horizontal ground G, and is symmetrical with respect to the vertical line v. 3. The connection between the valve and the resin pipe according to claim 1 or 2, wherein the valve 1 is supported on the ground G by a pair of engaging portions 6 and 6 being in contact with the ground G, respectively. Construction.   A resin pipe built-in type valve using the connection structure between the valve and the resin pipe according to any one of claims 1 to 3, wherein a connection receiving port 5 is provided in a valve box 2 of the valve 1, and the connection A locking portion 6 is provided around the receiving port 5, and the distal end portion 11 of the resin tube 10 is inserted into the connecting receiving port 5, whereby the outer periphery of the distal end portion 11 is formed on the inner peripheral surface of the connecting receiving port 5. An annular protrusion 12 provided on the outer periphery of the tip end portion 11 abuts against the front end surface 5a of the connection receiving port 5, and the outer peripheral surface of the connection receiving port 5 and the annular protrusion 12 are in contact with each other over the entire circumference. The outer peripheral surface of the fastening member 15 is covered with a cylindrical fastening member 15, and the front end portion 15 a of the fastening member 15 is locked to the annular protrusion 12 and the rear end portion 15 b is fixed to the locking portion 6. The annular protrusion 12 is brought into pressure contact with the front end surface 5a of the connection receiving port 5 so that the valve 1 and the resin are in contact with each other. And 10 connects the opposite side of the end portion 13, a resin pipe embedded valve, characterized in that the connectable to other resin tube 10 of the resin tube 10 which is the connection.

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