JP2652846B2 - Hermetic stopper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic plug for closing a pipe end opening of a conduit for transferring a pressure fluid.

[0002]

TECHNICAL BACKGROUND In the main part of a plug, a ring-shaped hermetic rubber, which is tightly fitted to the inner periphery of the open end of a synthetic resin conduit, utilizes a diametrical swelling phenomenon by a compressive action applied in the axial direction. In the operation stage of applying a compressive action to the hermetic rubber, a plurality of pointed push piles, which receive the reaction force, are simultaneously simultaneously moved in the radial direction of the plug body. Protruding, piercing and meshing with the inner peripheral surface of the conduit engaged with the hermetic plug, as a reaction force receiving,
A further compression action can be imparted to the hermetic rubber, and the stopper can be expected to have an action of preventing the plug from falling out of the pipe due to the internal pressure of the conduit.

Further, an operating shaft for imparting a compressive action to the hermetic rubber is formed in a pipe shape, and an opening at an outer end portion of the operating shaft protruding through a plug is normally closed tightly. Or an insertion port of an inspection instrument corresponding to any desired kind inspection of the pressurized fluid in the conduit.

[0004]

2. Description of the Related Art In a hermetic closure system for closing a pipe end opening of a conduit, a compressive action is applied to a circular airtight rubber in the axial direction to increase the diameter in the diameter direction, and the inner peripheral surface of the pipe is compressed. Some of them are close together to enhance the closing action.

[0005]

As described above, the circular hermetic rubber is subjected to a compressive action in the axial direction, and as a result, the inner circumference of the pipe to be closed by the diameter increasing action due to the swelling in the direct line direction. As described above, the surface of the hermetic rubber and the portion to be closed are only joined at the joint between the outer periphery of the hermetic rubber and the inner periphery of the conduit. A contact portion between the part of the hermetic rubber to be compressed and the inner periphery of the pipe becomes a reaction force receiving,
In some cases, the hermetic rubber may move without a compression action, and it is not rare that the original purpose is not achieved in this way.

In order to avoid such disadvantages, the present invention is directed to a synthetic resin pipe body in which a pushpile having a pointed end is projected from a plug body in a radial direction together with an operation of compressing an airtight rubber and engaged. Can be operated so as to receive the reaction force of the compressing action of the further airtight rubber, and to install the hermetic seal in a desired set position on the inner circumference of the end of the conduit in an airtight and immovable state. The purpose is to do so.

[0007]

According to a first aspect of the present invention, a piston is slidably rotated on the outer periphery of an operation shaft having a stopper projection projecting from the outer periphery. An operating range in which the piston is freely attached and the piston can slide is formed by the stopper and the fitting stop ring, and the center of the canopy having a diameter larger than the outer diameter of the tubular body to be engaged. A plurality of shaft insertion holes formed in the piston support the outer periphery of the piston combined with the operation shaft , and have a tapered shape formed at one end of the piston and directing an axis to the tapered surface. The dovetail-shaped groove is formed in the movement direction conversion part, and the plug body in which the recess in which the movement direction conversion part can be provided is formed. Supports airtightly and closes the opening of the recess with the above canopy The bottom surface of the recess 15 and the back surface of the canopy fixed parallel to the bottom surface are used as sliding surfaces, and the reverse of a symmetrical shape that can be surface-bonded to the tapered surface of the motion direction conversion unit. An operation piece having a tapered surface on the rear surface, a sharply-pushed push pile extending in the horizontal direction on the front surface, and a sliding piece provided on the reverse tapered surface on the rear surface, a guide head for the sliding piece. the engage the dovetail groove of the, with bonding the reverse tapered surface to the motion direction conversion portion, engages the push pile into through hole formed in the side wall to form a recess in said plug body, It is formed so that it can move in and out of the through hole in conjunction with the operation of the piston, and operates with a pressing seat plate centered on a female screw hole that can be engaged with a male screw engraved at the tip of the operating shaft penetrating this plug body. A shaft is screwed, and a substantially thick portion is formed between the pressing seat plate and one surface of the plug body. It consists of a drum-shaped airtight rubber.

According to a second aspect of the present invention, the operating shaft is formed in a pipe shape having a hollow passage, and when used as a hermetic plug, a female screw is provided on an inner periphery of an end exposed to the outside of the tube to close the hollow passage. To be mounted in a detachable manner.

[0009]

The airtight rubber of the plug is in a flexible ring state having a high elasticity, and its outer diameter is naturally left as it is, and it is larger than the inner diameter of the locking portion at the inner circumference of the synthetic resin tube to be inserted and plugged. formed with a small diameter, therefore, it is configured to be easily inserted engagement when caused to coincide with the core with each other when to the airtight rubber engaged inner periphery stopper action is to tube.

[0010] The hermetic rubber of the plug is in a flexible ring state having a high elasticity, and its outer diameter is naturally left as it is, and is larger than the inner diameter of the locking portion on the inner circumference of the synthetic resin tube to be inserted and plugged. It is formed so as to have a small diameter, so that when the airtight rubber is to be engaged with the inner periphery of the tubular state to be plugged, it can be easily inserted and engaged if the cores are aligned with each other.

The hermetic rubber is compressed in the axial direction to increase the diameter and enhance the hermeticity. A rotary seat is provided as a compression means in the axial direction with a pressing seat plate interposed with the hermetic rubber to the operating shaft. It is made to approach each other by screwing by movement,
This operating means is the same as before, but the axial momentum of the operating shaft which is screwed in with the airtight rubber locking position in the pipe as a reference position is pivotally and slidably supported on the operating shaft. A plurality of push piles that enter and exit in the radial direction via the piston movement direction converting means are inserted into the inner circumference from the axial direction of the paired engagement pipe, and the tip of the push pile is inserted into the inner peripheral surface of the synthetic resin pipe. Meshed into the tube and fixed to give the plug body a retaining action so that it becomes an immovable body,
The push-pile piercing and meshing position is made to receive a reaction force so that a further compressing action can be given to the hermetic rubber, and the purpose as a hermetic plug can be achieved by the diameter increasing action by the compressing operation. Things.

Further, the above-mentioned operation shaft is used as a tube shaft, and a communication path inside and outside the inside of the tube divided by a plug closed through the operation shaft is used. The shaft is tightly closed to act as a mere shaft, and if necessary, the closing member can be removed to insert and connect a testing device for a desired measurement value of a pressurized fluid in a bypass or a pressurized fluid in a pipe. It is like that.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an operation shaft according to an embodiment of the present invention; FIG. A male screw 6 is engraved on the outer periphery of the other end.

On the outer periphery of the operating shaft 2, the above-described female screw 5
An angled tool receiving portion 7 is provided at a position close to the end provided with the groove, and a stopper 8 having an increased diameter is bulged adjacent to the tool receiving portion 7 on the side opposite to the female screw 5 side.

A piston 9 which slides tightly on the operating shaft 2 and is rotatable is inserted from the male screw 6 side, and one end of the piston 9 is thrust into the stopper 8. The operation shaft 2 can be locked via the washer 12, and the operation shaft 2 is located at a position which is longer than the locking position of the protruding portion 8 by a piston idle distance which is longer than the entire length of the piston 9 by a set dimension.
A stop ring 10 is fitted on the outer periphery to prevent the piston 9 from being pulled out.

A tube B to which the stopper A of the present invention is to be locked
Is a synthetic resin pipe.

The canopy 11 having a diameter larger than the outer diameter of the tube B.
As described above, a shaft insertion hole through which the piston 9 into which the operation shaft 2 is inserted is slidable to support the piston 9 combined with the operation shaft 2 as described above.
3 can be fixed by bolts 14.

It is essential that the stopper body 13 has an outer diameter smaller than the inner diameter of the tube B and can freely pass through the inner circumference of the tube B. If possible, a circular shape slightly smaller than the inner diameter of the tube B is preferable. It is desirable that

As described above, the plug body 13 has one surface fixed to the canopy 11 and is provided with a concave portion 15 which is open at the joint surface thereof, and the peripheral wall forming the concave portion 15 penetrates the outer periphery. A plurality of through holes 16 are formed at equal intervals on a line radial from the axis.

The depth of the recess 15 is such that the sliding section set by the piston 9 on the operating shaft 2 can be obtained.

A shaft hole through which the operation shaft 2 can slide densely is provided at the center of the plug body 13, and an oil seal 17 and an O-ring 18 are fitted into the hole wall.

Further, on the outer periphery of the other end surface, an engagement step portion 19 for locking an airtight rubber 20 described later is formed in an annular shape.

In the plug body 13 formed as described above, the recess 15 is used as a working space for the piston 9, and the movement direction changing portion 21 formed at one end of the piston 9 is formed. Has a tapered shape having a small diameter portion as a tip, and a dovetail groove 22 is formed on the tapered surface along a radial line having an equal angle around the taper forming origin. The number is the same as the number of through holes 16 perforated in the peripheral wall forming the recess 15 described above,
Substantially eight.

Further, the recess 1 in the plug body 13 described above.
A push pile 25 having a bottom surface and a top and bottom surface of the canopy 11, which is in a parallel state with the bottom surface, as sliding surfaces, and a pushpile 25 having a pointed end from the front surface is implanted and fixed. A reverse tapered surface capable of contacting the tapered surface of the movement direction converting portion 21 is formed as a rear surface, and the dovetail-shaped groove 22 has a head which can slide freely in the groove on the reverse tapered surface. And a sliding piece 23 having a neck part of which can protrude outside from the groove part,
Is formed.

The pressing seat plate 26 faces the plug body 13 via the operating shaft 2 and holds the airtight rubber 20 in the middle.
In addition, a female screw hole 27 that can be screwed into the male screw 6 provided at one end of the operation shaft 2 is provided at the center of the operation shaft 2 so as to be able to impart a compressing action. As described above, the engaging step 19 for locking the airtight rubber 20 from the outer periphery is provided on the surface facing the plug body 13.

The hermetic rubber 20 is made of an annular cylinder made of synthetic rubber or natural rubber, and has a substantially drum-shaped outer shape, a tapered shape in which the middle portion of the drum has a large diameter and transitions to a small diameter at both ends. The large-diameter portion is slightly smaller than the inner diameter of the tube B to be engaged, and also in the inner shape of the airtight rubber 20, the middle portion has a larger diameter according to the outer shape, and the end portion has It is formed so as to have a very small diameter, and is formed so that the outer peripheral diameter is easily increased when a pressing operation from the axial direction is applied to the hermetic rubber 20.
The end portion is reduced in diameter at the time of insertion into the inside, thereby taking into account the ease of the insertion operation.

In order to form the hermetic plug A with each of the members configured as described above, first, the operating shaft 2 is inserted into the hollow portion of the thrust washer 12 from the end where the male screw 6 is provided, and is brought into contact with the stopper 8. After the operating shaft 2 is inserted into the shaft insertion hole of the canopy 11 from the end where the male screw 6 is provided and brought into contact with the thrust washer 12, the operating shaft 2 is inserted into the shaft hole of the piston 9. Insert and move from the end where the male screw 6 is provided,
The thrust washer 12 is inserted into the shaft insertion hole of the canopy 11 and brought into contact with the thrust washer 12. Thereafter, the stop ring 10 is locked to the operation shaft so that the operation shaft 2 and the piston 9 cannot be separated from each other. Is supported by a shaft insertion hole of the canopy 11.

Next, the push pile 25 of the operation piece 24
After the pointed end of the plug body 13 is bored in the side wall forming the recess 15 of the plug body 15 and inserted into the through hole 16 from the inside thereof, the operation shaft is inserted into the shaft hole drilled in the center of the plug body 13. 2 is inserted from the end having the male screw 6 in the direction of the perforated surface of the recess 15 and formed into a dovetail-shaped groove 22 of the movement direction changing portion 22 of the piston 9 so as to protrude from the reverse tapered surface of the operation piece 24. The guide head of the moving piece 23 is engaged, and the surface on which the recess 15 is opened and the canopy 11 are then tightly united.
And firmly adhere.

In this way, the operation shaft 2 protruding from the plug body 13 surrounds the hermetic rubber 20, and the opening edge of one end of the hermetic rubber 20 abuts and engages with the engaging step 19 of the plug body 13. Thereafter, the male screw 6 of the operating shaft 2 is screwed into the female screw hole 27 at the center so that the engaging step 19 provided on the circumference of the pressing seat plate 26 faces the plug body 13. Then, the opening edge of the other end of the airtight rubber 20 is engaged with the engaging step 19 on the pressing seat plate 26 side, and the male screw 6 of the operating shaft 2 and the pressing seat plate 2
The sealing plug A is formed by increasing the screwing depth with the female screw hole 27 of No. 6.

The thus-formed hermetic plug A is provided with an airtight rubber 20 (pressing seat plate 26) from the open end of the tube B to the inner periphery thereof.
Can be inserted until the back surface of the canopy 11 is engaged with the opening edge of the tubular body B.

When the hermetic rubber 20 has been inserted into the tube B in this manner, a rotation operation is given to the operation shaft 2 so that the pressing seat plate 26 screwed to the operation shaft 2 is immovable. By pulling it toward the stopper body 13 at the set position and reducing the gap size, the interposed hermetic rubber 20 is turned into a diameter expanding operation in a diameter direction by an axial compression action.

At this time, since the hermetic rubber 20 is to act within the range regulated by the inner circumference of the tube b, the required torque of the rotational movement of the operating shaft 2 also increases, and this required torque is reduced. Accordingly, if the torque is increased, only the operating shaft 2 is screwed through the female screw hole 27 of the pressing seat plate 26 which maintains the immobile state due to the contact resistance between the tube B and the airtight rubber 20, and the operating shaft 2 The piston 9 locked by the stopper 8 moves along with the movement of the stopper 8 and advances inside the fixed plug body 13.

The operation of each operating piece 24 provided in the recess 15 of the plug body B is restricted by two parallel surfaces by the bottom surface of the recess 15 and the back surface of the canopy 11 closing the recess 15. Therefore, with respect to the operation piece 24 in the radial direction of the stopper main body 13 which is a movable direction, an inversely tapered surface of the operation piece 24 which is in contact with the tapered surface of the movement direction conversion portion 21 formed at the end of the piston 9. The movement amount of the piston 9 is directly transmitted to the operation piece 24 by the change of the movement direction by the change of the contact height position, and the push pile 25 provided on the operation piece 24 is formed in the side wall forming the recess 15. The penetrated through hole 16 is directed in the outer peripheral direction and protrudes, and the pointed end is pierced into the inner periphery of the synthetic resin tube B opposed to the outer periphery of the side wall, and meshes with the tube B. The connection state with the main body 13 is formed. .

At the stage where such a connected state is formed, if the rotating operation of the operating shaft 2 is continued, the tube B
The stopper body 13 combined with the airtight rubber 2 is configured to receive a reaction force of the pressure applied to the airtight rubber 20 as an immovable body.
The strong torque required for the diameter increasing operation of 0 can be applied, whereby a high contact pressure between the hermetic rubber 20 and the inner periphery of the tube B can be achieved, and the purpose as a hermetic plug can be achieved. .

Since the sliding piece 23 is connected to the operation piece 24 which comes into surface contact with the tapered surface of the movement direction conversion section 21, the piston 9 including the movement direction conversion section 21 returns to the original position. At this time, the slide piece 23 moves with its guide head sliding in the dovetail groove 22, and the reverse tapered surface of the operation piece 24 continues to contact the tapered surface of the movement direction converting portion 21, and the plug body is moved. The push pile 25 moves toward the center of the pipe 13 and can be detached from the inner periphery of the tube B.

In the case of the operating shaft 2 operated as described above, if only the sealing operation is to be performed, it is unnecessary to form the bypass passage and to connect the inspection device. 2 may be made of a solid material.

[0037]

As described above, the present invention relates to a synthetic resin tube for transferring a fluid, and in the hermetic plug for closing the opening at the end of the tube, the diameter of the hermetic rubber which acts as a plug increases. Utilizing the rotational movement of the operating shaft that forms an axial compression action for making a close contact with the circumference, the axial momentum due to screwing is transferred from the plug body with the push pile inserted into the pipe via the movement direction conversion means. The plug body is protruded in the radial direction, the tip of the push pile is inserted into the pipe wall from the inner peripheral surface of the pipe body and meshed with each other, so that the plug body and the pipe body are firmly united to set the immobile fixing position. Since this plug body is made to receive the reaction force of the compression operation of the hermetic rubber, it is possible to apply a high compression torque to the hermetic rubber, so that the consolidation effect more than before and the Can prevent outbreak accidents. It is intended to have an effect.

Further, by forming the operating shaft of the hermetic plug having the above-mentioned effect in the form of a hollow pipe provided with a closing member, it is possible to perform all necessary measurements of the pressurized fluid in the connection port of the bypass circuit or the pipe in addition to the hermetic plug. It can be used also as an insertion port of a tester for use.

[0039]

[Brief description of the drawings]

FIG. 1 is a front view of a hermetic plug partially shown in section.

FIG. 2 is a front view of a hermetic plug showing a cross section of a part of an operation shaft formed of a hollow material.

FIG. 3 is a plan view of a piston provided with a movement direction conversion unit.

FIG. 4 is a vertical sectional view taken along the line II in FIG. 3;

FIG. 5 is a perspective view of an operation piece.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hollow path 2 Operating shaft 3 Dust plug 4 Coupler 5 Female screw 6 Male screw 7 Tool receiving part 8 Stopper 9 Piston 10 Stop ring 11 Canopy 12 Thrust washer 13 Plug body 14 Bolt 15 Concave 16 Through hole 17 Oil seal 18 O Ring 19 Engagement step 20 Airtight rubber 21 Movement direction conversion part 22 Dovetail groove 23 Sliding piece 24 Operating piece 25 Push pile 26 Press seat plate 27 Female screw hole A Seal plug B Tube

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Katsunori Negishi 6-9-9 Asahicho, Soka City, Saitama Prefecture (72) Inventor Tatsunori Suzuki 47-5 Higashiminecho, Ota-ku, Tokyo (72) Inventor Michio Hasegawa Niigata 428-7, Joegeniri, Joetsu-shi, Prefecture (72) Inventor Hideya Aoki 2-1-1, Yasue, Joetsu-shi, Niigata

Claims (2)

(57) [Claims] 1. A piston 9 is slidably mounted on the outer periphery of an operation shaft 2 having a stopper projection 8 protruding from the outer periphery, and the piston 9 is slidably movable in a predetermined operation range. When the piston is formed by a stop ring 10 which fits, coalesced into the operating shaft 2 with shaft insertion hole formed than the outer diameter in the center of the large diameter canopy 11 of the tube B to be engaged 9 and the piston 9
A motion direction conversion unit 21 having a tapered shape formed at one end thereof and having a plurality of dovetail grooves 22 directed to the axis line formed in the tapered surface is formed, and the motion direction conversion unit 21 can be provided inside. A plug body 13 having a recess 15 is provided, and the operation shaft 2 is air-tightly supported by a shaft hole provided at the center thereof,
The opening of the recess 15 can be closed by the canopy 11, and the bottom surface of the recess 15 and the back surface of the canopy 11 fixed parallel to the bottom surface are used as sliding surfaces, and The rear face has a symmetrical reverse taper face that can be surface-bonded to the taper face of the direction changing part 21, the front face includes a sharp pushpile 25 that extends in the horizontal direction, and the rear face slides on the reverse taper face. Operation piece 24 provided with piece 23
The guide head of the sliding piece 23 is engaged with the dovetail groove 22, the reverse tapered surface is joined to the movement direction conversion portion 21, and the side wall forming the recess 15 of the plug body 13 is The push pile 25 is engaged with the drilled through hole 16 so as to be able to move in and out of the through hole 16 in conjunction with the operation of the piston 9. The operating shaft 2 is screwed together with a pressing seat plate 26 provided around a female screw hole 27 with which the provided male screw 6 can be engaged, and a substantially drum is inserted between the pressing seat plate 26 and one surface of the plug body 13. A hermetic seal comprising a body-shaped airtight rubber 20 sandwiched therebetween. 2. An operation shaft 2 is formed in a pipe shape having a hollow passage 1, and a female screw 5 is provided on an inner periphery of an end exposed to the outside of the tubular body B when used as a hermetic plug, thereby closing the hollow passage 1. 2. The hermetic plug according to claim 1, wherein a coupler 4 is detachably mounted.