JP2001141060A - Pipe sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate requirement of a backup device for preventing coming off and to apply a sufficient sealing function even when the inside pressure of a pipe is high. SOLUTION: The diameter of a pipe clamp 4 is decreased by moving a clamp base 3 to an axial end side in relation to a base member 2, and a pressure contact inner peripheral surface 4c of the pipe clamp 4 is pressed to contact with the outer peripheral surface of an end 1a of the pipe 1. In accordance with movement of a pressing fitting 9 to an axial side in relation to the base member 2, a seal member 8 is at least axially compressed between the base member 2 and the pressing fitting 9. Thus, coming off a shaft member 5 to an axial end side in relation to the base member 2 is suppressed, and the seal member 8 is swelled inward and outward in the diametrical direction for pressure contact with the outer peripheral surface of the shaft member 5 and the inner peripheral surface of the end 1a of the pipe 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe sealing device mounted on a pipe end to seal the pipe end.

[0002]

2. Description of the Related Art Conventionally, as a method of forming a pipe having an irregular cross section having a different cross sectional shape in the longitudinal direction, a pressure medium such as water or oil is sealed inside the pipe while holding the pipe in a mold. There is known a hydroforming method in which a pressure is applied to a pressure medium, and the pipe itself is swelled using the pressure of the pressure medium to form the pipe according to the mold surface.

[0003] In carrying out this molding method, the end of the pipe is sealed with a sealing device such as a rubber elastic body or an insert fitting, and a pressure is introduced into the inside of the pipe through a hydraulic pressure introducing hole provided in the sealing device. The medium is filled and pressure is applied to the pressure medium.

[0004]

In the above-mentioned hydroforming method, since the pipe is formed along the mold surface by using the pressure of the pressure medium sealed in the pipe, the inside of the pipe is considerably pressurized. Need to be

However, the conventional sealing device is
Since the sealing performance was not improved due to the increase in the pressure inside the pipe, or the structure where the pressure inside the pipe could be received by the sealing device itself, the sealing performance decreased with the increase in the pressure inside the pipe. Or to prevent the sealing device from coming off the pipe end
There is a problem that a backup device using a hydraulic cylinder or the like is required separately.

[0008] As shown in FIG. 8, for example, by attaching a backup plate 93 to an upper mold 92 fixed to a press ram 91 in advance, a pipe 94 is formed.
At the time of press working, if the plate 93 is brought into contact with the end face of the sealing device 95 mounted on the end of the pipe 94 at the same time as the press ram 91 is lowered, there is no need to separately provide a backup device using a hydraulic cylinder or the like. It is also possible to prevent the device 94 from coming off. However, in this case, abrasion or the like may occur between the end surface of the sealing device 94 and the plate 93 due to sliding contact or contact with the plate 93, and the life of the sealing device 94 may be reduced.

The present invention has been made in view of the above circumstances, and has been made to improve the sealing performance and the prevention of a sealing device from coming off from a pipe in response to an increase in pressure inside the pipe.
An object of the present invention is to provide a pipe sealing device capable of sufficiently exhibiting a sealing function even when a high pressure is applied to the inside of a pipe while eliminating the need for a backup device for preventing the detachment.

[0008]

According to the present invention, there is provided a pipe sealing device mounted on an end of a pipe for sealing the end of the pipe in a liquid-tight manner. It is arranged facing the end face of the end,
A base member formed of a substantially disc-shaped member having an axial hole, and disposed on the outer peripheral surface of the pipe end and the outer peripheral surface of the base member, and one end in the axial direction corresponding to the axially outward side of the pipe. An inner peripheral surface which is engaged with the outer peripheral surface of the base member and which is pressed against the outer peripheral surface of the pipe end on the inner peripheral surface at the other axial end corresponding to the axially inner side of the pipe. A clamp member formed of a cylindrical member, a shaft member inserted into a shaft hole of the base member, and disposed between an inner peripheral surface of the pipe end and an outer peripheral surface of the shaft member;
A seal member made of a substantially disk-shaped elastic member having an axial hole through which the shaft member is inserted, and the other end of the shaft member in the axial direction facing the end surface of the seal member on the other end side in the axial direction. Holding means extending integrally or separately radially outward from the outer peripheral surface of the base member and capable of moving relative to the base member in the axial direction, the holding means being pressed to one end in the axial direction. As the seal member is compressed at least in the axial direction between the base member and the holding means in association with the axial movement of the means, the shaft member is prevented from coming off from the base member to one end in the axial direction. In addition, the seal member swells radially inward and outward, and is pressed against the outer peripheral surface of the shaft member and the inner peripheral surface of the pipe end. .

In this pipe sealing apparatus, a clamp member is engaged with an outer peripheral surface of a base member disposed opposite to an end surface of the pipe, and an inner peripheral surface of the clamp member is pressed against an outer peripheral surface of the pipe end. You. Also, with the axial movement of the pressing means toward one axial end of the base member (outward of the pipe end in the axial direction), the arrangement is made between the outer peripheral surface of the shaft member and the inner peripheral surface of the pipe end. The installed seal member,
By being compressed at least in the axial direction between the base member and the holding means, the shaft member is prevented from coming off from the base member to one end in the axial direction, and the seal member expands radially inward and outward. It comes out and is pressed against the outer peripheral surface of the shaft member and the inner peripheral surface of the pipe end.

In this way, the inner peripheral surface of the clamp member is pressed against the outer peripheral surface of the pipe end, and the outer peripheral surface of the seal member is pressed against the inner peripheral surface of the pipe end.
The removal of the pipe sealing device from the pipe end is restricted, and the pipe sealing device is securely held against the pipe end. Further, the outer peripheral surface of the seal member is pressed against the inner peripheral surface of the pipe end, and the inner peripheral surface of the seal member is pressed against the outer peripheral surface of the shaft member. Is surely secured.

Further, if the holding means moves in the axial direction toward the one end in the axial direction due to a rise in the pressure inside the pipe, the seal member is further compressed in the axial direction between the base member and the holding means. Therefore, the seal member further swells radially inward and outward, and is strongly pressed against the outer peripheral surface of the shaft member and the inner peripheral surface of the pipe end. For this reason, the sealing performance on the inner and outer peripheral surfaces of the sealing member and the prevention of the pipe sealing device from coming off from the end of the pipe are improved in accordance with the increase in the pressure inside the pipe.

Therefore, the pipe sealing device does not require a backup device for preventing the pipe sealing device from coming off, and can sufficiently exhibit a sealing function even when the inside of the pipe becomes high pressure.

In a preferred aspect of the clamp member, the one end of the clamp member is engaged with the base member so as to be relatively movable in the axial direction. A clamp base having a tapered inner peripheral surface whose diameter is reduced or enlarged toward the other end side; and the pressure contact pressed against the tapered outer peripheral surface facing the tapered inner peripheral surface and the outer peripheral surface of the pipe end. A pipe clamp having an inner peripheral surface, having at least one slit in the circumferential direction, and being formed of a substantially ring-shaped member capable of reducing and expanding the diameter can be employed.

[0014] In the pipe sealing device of this aspect, the clamp base, which is axially movably engaged with the outer peripheral surface of the base member, moves to one end or the other end in the axial direction. When the taper outer peripheral surface of the pipe clamp is pressed by the taper inner peripheral surface of the clamp base, the diameter of the pipe clamp is reduced, and the inner peripheral surface of the pipe clamp is pressed against the outer peripheral surface of the pipe end. In this way, the pipe clamp can be held on the outer peripheral surface of the pipe end by utilizing the fastening force due to the diameter reduction of the pipe clamp. By increasing the fastening force, the outer peripheral surface of the pipe end can be increased. Thus, the pipe clamp can be held firmly, so that the pipe sealing device can be more securely prevented from coming off from the pipe end.

Also, even if the base member moves toward one end in the axial direction with respect to the end of the pipe due to an increase in the pressure inside the pipe, the base member is clamped in synchronization with the axial movement of the base member. The base body also moves to one end in the axial direction, and the pipe clamp is further reduced in diameter, thereby increasing the fastening force due to the reduction in diameter. It is possible to reliably prevent the pipe sealing device from coming off from the end.

In another preferred embodiment of the clamp member, the clamp member has at least two divided bodies each having the inner circumferential surface of the press-welded portion obtained by dividing a substantially cylindrical member into at least two parts in a circumferential direction; It is possible to adopt a structure comprising fastening means for fastening and integrating each of the divided bodies while engaging one end side in the axial direction with the outer peripheral surface of the base member.

In the pipe sealing device of this aspect, the clamping member engages one end in the axial direction of each divided body with the outer peripheral surface of the base member by the fastening means, and tightens each of the divided bodies. By moving the divided bodies in the centripetal direction, the diameter of the substantially cylindrical member formed by each divided body is reduced, and the inner peripheral surface of each divided body is pressed against the outer peripheral surface of the pipe end. As described above, the clamp member is held on the outer peripheral surface of the pipe end portion by utilizing the fastening force caused by the movement of each divided body in the centripetal direction and the reduction of the diameter of the substantially cylindrical member formed by each divided body. Therefore, by increasing the fastening force, the clamp member is firmly held on the outer peripheral surface of the pipe end, and the pipe sealing device can be more securely prevented from coming off from the pipe end. .

As a preferred mode of the sealing member and the pressing means, the sealing member has a pressed tapered inner periphery having an enlarged diameter on the end face on the other end side in the axial direction toward the other end side in the axial direction. At least one of the outer peripheral pressed portion having the surface and the inner peripheral pressed portion having the pressed tapered outer peripheral surface reduced in diameter toward the other end in the axial direction is integrally formed with the other end in the axial direction. The pressing means includes a pressing taper outer peripheral surface facing the pressed taper inner peripheral surface of the outer peripheral pressed portion and a pressing taper outer surface facing the pressed taper outer peripheral surface of the inner peripheral pressed portion. At least one of the peripheral surfaces may be provided.

In the pipe sealing apparatus in which the sealing member and the pressing means are in this mode, at least one of the inner peripheral surface of the pressed taper and the outer peripheral surface of the pressed taper is accompanied by the axial movement of the pressing means toward one end in the axial direction. Is pressed by at least one of the outer peripheral surface of the pressing taper and the inner peripheral surface of the pressing taper, so that at least one of the outer peripheral pressed portion and the inner peripheral pressed portion is compressed in the axial direction and the radial direction, and At least one of the outer peripheral surface of the pressing portion and the inner peripheral surface of the inner peripheral pressed portion is pressed against at least one of the inner peripheral surface of the pipe end and the outer peripheral surface of the shaft member. As described above, with the axial movement of the pressing means toward one end in the axial direction, at least one of the outer peripheral surface of the outer peripheral pressed portion and the inner peripheral surface of the inner peripheral pressed portion has the inner peripheral surface of the pipe end and the shaft member. Is pressed against at least one of the outer peripheral surfaces of the pipe, so that the pressing means moves in the axial direction to one side in the axial direction due to the increase in the pressure inside the pipe, so that at least one of the inner peripheral surface of the pipe end and the outer peripheral surface of the shaft member is formed. It is possible to more effectively improve the sealing performance. In addition, when the outer peripheral pressed portion is provided on the seal member and the pressing taper outer peripheral surface is provided on the pressing means, the outer peripheral pressed portion of the seal member is moved along with the axial movement of the pressing means to one end in the axial direction. The inner peripheral surface of the pressed taper is pressed by the outer peripheral surface of the pressing taper of the pressing means, and the outer peripheral surface of the outer peripheral pressed portion is pressed against the inner peripheral surface of the pipe end, thereby preventing the pipe sealing device from coming off from the pipe end. Performance can be further improved.

As a preferable mode of the pressing means, the pressing means includes an inner pressing protrusion protruding from an inner peripheral region and an outer pressing protrusion protruding from an outer peripheral region on an end surface on one end side in the axial direction. At least one of the units may be provided.

In the pipe sealing device in which the holding means is in this mode, the end face of the other end in the axial direction of the sealing member is moved to the inner circumferential pressing protrusion and the outer circumferential pressing protrusion with the axial movement of the pressing means to one end in the axial direction. At least one of the parts is locally pressed in the axial direction, so that at least one of the inner peripheral surface and the outer peripheral surface of the seal member expands in the radial direction, so that the inner peripheral surface of the shaft member and the inner end surface of the pipe member are inflated. It is pressed against at least one of the peripheral surfaces. As described above, with the axial movement of the pressing means toward one end in the axial direction, at least one of the inner peripheral surface and the outer peripheral surface of the seal member is at least one of the outer peripheral surface of the shaft member and the inner peripheral surface of the pipe end. Since the pressing means moves in the axial direction to one side in the axial direction due to an increase in the pressure inside the pipe, the sealing performance on at least one of the outer peripheral surface of the shaft member and the inner peripheral surface of the pipe end is more effectively improved. Can be improved. In the case where the pressing means is provided with an outer peripheral pressing protrusion, the axial end of the sealing member is pressed by the outer peripheral pressing protrusion with the outer peripheral pressing protrusion in accordance with the axial movement of the pressing means to one axial end. Since the outer peripheral surface of the member is pressed against the inner peripheral surface of the pipe end, it is possible to further improve the prevention of the pipe sealing device from coming off from the pipe end.

As a preferred embodiment of the inner peripheral surface of the press-contact of the clamp member, the inner peripheral surface of the press-contact can be provided with at least one tooth portion having a mountain-shaped cross section.

In the pipe sealing device in which the inner peripheral surface of the clamp member is in this mode, the teeth of the inner peripheral surface of the clamp bite into the outer peripheral surface of the end of the pipe, so that the inner peripheral surface of the clamp member and the end of the pipe end. The mechanical coupling force with the outer peripheral surface increases. For this reason, the holding ability of the clamp member to the pipe end is further improved, and the pipe sealing device is further prevented from coming off.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings.

(Embodiment 1) The pipe sealing apparatus of the present embodiment shown in FIGS. 1 and 2 embodies the invention according to claim 1, 2, 4 or 5.

This pipe sealing device is mounted on an end 1a of the pipe 1 at one end in the axial direction, and is mounted on the end 1a of the pipe 1.
a in a liquid-tight manner, comprising: a base member 2;
A clamp base 3 constituting a clamp member, a pipe clamp 4 constituting a clamp member, a shaft member 5,
A tightening screw 6, a nut 7, a sealing member 8, and a holding member 9 which constitutes holding means extending radially outward from the outer peripheral surface of the shaft member 5 separately from the shaft member 5.
It is composed of

In the following description, one end in the axial direction refers to the outer side in the axial direction of the pipe 1 when the pipe sealing device is attached to the end 1a at the one end in the axial direction. The right end of the pipe 1 means the one end in the axial direction, and the other end in the axial direction means the other end in the axial direction corresponding to the inner side in the axial direction of the pipe 1 (the left side in FIG. 1).

The base member 2 has an outer diameter larger than the outer diameter of the end 1a of the pipe 1, and is made of a substantially disk-shaped metal member having a shaft hole 2a. The base member 2 is disposed so as to face the end face of the end 1a in a state where the pipe sealing device is mounted on the end 1a of the pipe 1, and has an opposing end face 2b facing the end face of the end 1a. In the other direction.
A male screw portion 2c is provided on the outer peripheral surface of the base member 2, and a boss portion 2d is provided on an end surface of the base member 2 at one end in the axial direction.
Is provided.

The clamp base 3 has an inner diameter larger than the outer diameter of the end 1a of the pipe 1 and is made of a substantially cylindrical member made of metal. The clamp base 3 is disposed on the outer periphery of the base member 2 and the end 1a of the pipe 1 in a state where the pipe sealing device is mounted on the end 1a of the pipe 1. The base member 2 is provided on the inner peripheral surface at one end of the clamp base 3 at one axial end.
Is provided with a female screw portion 3a which can be screwed into the male screw portion 2c. One end in the axial direction of the clamp base 3 is engaged with the base member 2 so as to be relatively movable in the axial direction through the screwing of the female screw portion 3a of the clamp base 3 and the male screw portion 2c of the base member 2. . Further, a tapered inner peripheral surface 3b whose diameter is reduced toward the other axial end is formed on the inner peripheral surface of the other end of the clamp base 3 in the axial direction.

The pipe clamp 4 has a single slit 4a in the circumferential direction and is a substantially ring-shaped metal member (C-shaped member having a C-shaped cross section; see FIG. 2 (b)) which can be reduced in diameter and expanded in diameter. Consisting of Further, the pipe clamp 4 is mounted in a state where the pipe sealing device is attached to the end 1 a of the pipe 1.
It has a tapered outer peripheral surface 4b facing the tapered inner peripheral surface 3b of the clamp base 3, and a press-contact inner peripheral surface 4c pressed against the outer peripheral surface of the end 1a of the pipe 1. The pipe clamp 4 has an inner diameter substantially equal to the outer diameter of the end 1a of the pipe 1 or slightly larger than the outer diameter of the end 1a in a natural state where no external force is applied. It has an outer diameter substantially equal to the inner diameter of the peripheral surface 3b.

The shaft member 5 is made of a metal shaft member. The shaft member 5 has a large diameter portion 5 sequentially from one end in the axial direction.
a, having a middle diameter portion 5b and a small diameter portion 5c, the middle diameter portion 5b being axially movable relative to the shaft hole 2a of the base member 2 in a state where the pipe sealing device is attached to the end 1a of the pipe 1. Has been inserted. The large diameter portion 5a of the shaft member 5 is
The outer diameter of the large diameter portion 5a is larger than the inner diameter of the shaft hole 2a of the base member 2, and a first male screw portion 5d is provided on the outer peripheral surface of the large diameter portion 5a. Further, a second male screw portion 5e is provided on the outer peripheral surface of the small diameter portion 5c of the shaft member 5. In addition, in order to supply liquid to the inside of the pipe 1 from a liquid supply means (not shown) such as a pump and to connect a liquid supply pipe (not shown), a supply passage 5f and a connection port are provided inside the shaft member 5. 5 g are provided.

When the pipe sealing device is mounted on the end 1 a of the pipe 1, the tightening screw 6 is
Of the first male screw portion 5d. The tightening screw 6 has an outer diameter slightly smaller than the inner diameter of the boss 2 d of the base member 2, and the other end of the tightening screw 6 on the other axial side is the boss 2.
d. The shaft member 5 can be moved relative to the base member 2 toward one end or the other end in the axial direction through the screwing of the tightening screw 6 and the first male screw portion 5d of the shaft member 5. I have.

When the pipe sealing device is mounted on the end 1a of the pipe 1, the seal member 8 is disposed between the inner peripheral surface of the end 1a of the pipe 1 and the outer peripheral surface of the middle diameter portion 5b of the shaft member 5. And a substantially disk-shaped rubber elastic member having a shaft hole 8a through which the middle diameter portion 5b of the shaft member 5 is inserted. In the seal member 8, an outer peripheral pressed portion 8c having a pressed tapered inner peripheral surface 8b whose diameter is increased toward the other end in the axial direction is provided in the outer peripheral region of the end surface on the other end in the axial direction. It protrudes integrally to the end side. In addition, this sealing member 8
In a natural state where no external force is applied, the end 1a of the pipe 1
Of the shaft member 5 or slightly larger than the outer diameter of the middle diameter portion 5b.

The holding member 9 is a substantially disk-shaped member having a shaft hole 9a through which the middle diameter portion 5b of the shaft member 5 is inserted. The holding fixture 9 is such that the pipe sealing device is the pipe 1
The shaft member 5 is mounted on the outer peripheral surface of the middle diameter portion 5b of the shaft member 5 while being attached to the end portion 1a of the shaft member 5 so that the shaft member 5 faces the other end surface in the axial direction of the seal member 8.
And extends radially outward from the outer peripheral surface of the middle diameter portion 5b. The presser fitting 9 is provided with a pressing tapered outer peripheral surface 9b facing the pressed tapered inner peripheral surface 8b of the outer peripheral pressed portion 8c of the seal member 8. In addition, holding metal 9
Has an inner peripheral pressing projection 9 on the inner peripheral area of the end face on one end side in the axial direction.
c is integrally protruded. The second end of the small diameter portion 5c of the shaft member 5 is provided on the end face of the holding member 9 at the other end in the axial direction.
The nut 7 screwed into the male screw portion 5e abuts, whereby the holding metal 9 is axially movable in synchronization with the axial movement of the shaft member 5 to one axial end. The shaft member 5 and the base member 2 can move relative to one axial end with the shaft member 5.

The pipe sealing device having the above configuration can be mounted on the end 1a of the pipe 1 as follows.

First, the small diameter portion 5c and the medium diameter portion 5b of the shaft member 5 in which the tightening screw 6 is screwed into the first male screw portion 5d are inserted into the shaft hole 2a of the base member 2 from one end in the axial direction. The sealing member 8 and the holding member 9 are sequentially set on the middle diameter portion 5b of the shaft member 5, and the small diameter portion 5 of the shaft member 5 is set.
The nut 7 is screwed into the second male screw portion 5e of FIG. 3C to prevent the seal member 8 and the holding member 9 from coming off from the shaft member 5, and also to prevent the shaft member 5 from coming off from the base member 2. Then, the male screw portion 2c of the base member 2
The female screw 3a of the clamp base 3 is screwed into
A pipe clamp 4 is attached to the tapered inner peripheral surface 3b of the clamp base 3.
Hold.

In the state where the pipe sealing device is assembled in this manner (the state shown in FIG. 1), the end 1a of the pipe 1 is inserted between the pipe clamp 4 and the seal member 8, and the end 1a
Is brought into contact with the opposing end surface 2b of the base member 2.

In this state, the tightening screw 6 is rotated through the screwing of the first male screw portion 5 d of the shaft member 5 and the tightening screw 6, whereby the shaft member 5 is axially connected to the base member 2 at one end in the axial direction. To the side in the axial direction. As a result, the holding member 9 moves relative to the base member 2 in the axial direction to one end in the axial direction in synchronization with the axial movement of the shaft member 5. With the axial movement of the holding member 9 to one end in the axial direction, the pressed tapered inner peripheral surface 8b of the outer pressed portion 8c of the seal member 8 is pressed by the pressing tapered outer peripheral surface 9b of the holding member 9. Accordingly, the outer peripheral pressed portion 8c of the seal member 8 is compressed in the axial direction and the radial direction, and the outer peripheral surface of the outer peripheral pressed portion 8c is pressed against the inner peripheral surface of the end 1a of the pipe 1. In addition, with the axial movement of the holding member 9 to one end in the axial direction, the inner peripheral area of the end surface on the other end in the axial direction of the sealing member 8 is locally formed by the inner circumferential pressing protrusion 9 c of the holding member 9. By being pressed in the axial direction, the inner peripheral surface of the seal member 8 expands radially inward and is pressed against the outer peripheral surface of the middle diameter portion 5b of the shaft member 5.

Then, the clamp base 3 is rotated on its own axis by screwing the male screw portion 2c of the base member 2 and the female screw portion 3a of the clamp base 3 so that the clamp base 3 is axially moved relative to the base member 2. Move relatively to one end in the axial direction. Thereby, the tapered outer peripheral surface 4b of the pipe clamp 4
Is pressed by the tapered inner peripheral surface 3b of the clamp base 3, the diameter of the pipe clamp 4 is reduced, and the pressed inner peripheral surface 4c of the pipe clamp 4 is pressed against the outer peripheral surface of the end 1a of the pipe 1.

In this manner, in this pipe sealing device, the clamp base 3 is engaged with the outer peripheral surface of the base member 2 disposed opposite to the end face of the end 1a of the pipe 1, and is held by the clamp base 3. The inner peripheral surface 4c of the pipe clamp 4 is pressed against the outer peripheral surface of the end 1a of the pipe 1. In addition, with the axial movement of the holding member 9 synchronized with the axial movement of the shaft member 5 to one end in the axial direction with respect to the base member 2, the outer peripheral surface of the shaft member 5 and the inner peripheral surface of the end 1 a of the pipe 1. And a sealing member 8 disposed between
By being compressed at least in the axial direction between the base member 2 and the holding member 9, the shaft member 5 is prevented from coming off from the base member 2 toward one axial end, and the seal member 8 is moved inward in the radial direction. The outer peripheral surface of the middle diameter portion 5 b of the shaft member 5 swelling outward and the end 1 of the pipe 1
a is pressed into contact with the inner peripheral surface of a.

Therefore, in this pipe sealing apparatus, the inner peripheral surface 4c of the pipe clamp 4 is pressed against the outer peripheral surface of the end 1a of the pipe 1, and the sealing member 8 is pressed against the inner peripheral surface of the end 1a of the pipe 1. Is pressed against the outer peripheral surface of the pipe 1, the removal of the pipe sealing device from the end 1 a of the pipe 1 is regulated, and the pipe sealing device is securely held to the end 1 a of the pipe 1. The outer peripheral surface of the seal member 8 is pressed against the inner peripheral surface of the end 1 a of the pipe 1, and the inner peripheral surface of the seal member 8 is pressed against the outer peripheral surface of the shaft member 5. The sealing performance on the inner and outer peripheral surfaces is reliably ensured.

In addition, due to the pressure increase inside the pipe 1,
If the holding member 9 moves alone or in the axial direction to the one end in the axial direction with respect to the base member 2, the sealing member 8 is further compressed in the axial direction between the base member 2 and the holding member 9. As a result, the seal member 8 further expands radially inward and outward, and is strongly pressed against the outer peripheral surface of the shaft member 5 and the inner peripheral surface of the end 1a of the pipe 1. For this reason, the sealing performance on the inner and outer peripheral surfaces of the sealing member 8 and the prevention of the pipe sealing device from coming off from the end 1a of the pipe 1 are improved in accordance with the increase in the pressure inside the pipe 1.

In the pipe sealing device of this embodiment, the taper outer peripheral surface 4b of the pipe clamp 4 is caused to move as the clamp base 3 moves to one end in the axial direction with respect to the base member 2. The pipe clamp 4 is reduced in diameter by being pressed by the inner peripheral surface 3 b, and the inner peripheral surface 4 c of the pipe clamp 4 is pressed against the end 1 of the pipe 1.
a. Thus, the pipe clamp 4
Since the pipe clamp 4 can be held on the outer peripheral surface of the end 1a of the pipe 1 by utilizing the fastening force due to the diameter reduction of the pipe 1, by increasing the fastening force, the end 1a of the pipe 1 By firmly holding the pipe clamp 4 on the outer peripheral surface, it is possible to further improve the prevention of the pipe sealing device from coming off from the end 1a of the pipe 1.
Even if the base member 2 moves to one end in the axial direction together with the shaft member 5 and the like with respect to the end portion 1a of the pipe 1 due to an increase in the pressure inside the pipe 1, The clamp base 3 also moves to one end in the axial direction in synchronization with the movement in the axial direction, and the pipe clamp 4 is further reduced in diameter and the fastening force due to the reduction in diameter is increased. Accordingly, the outer circumference of the end 1a of the pipe 1 is increased. The pipe clamp 4 constituting the clamp member can be held more firmly on the surface. Therefore, it is possible to more reliably prevent the pipe sealing device from coming off due to an increase in the pressure inside the pipe 1.

Further, in the pipe sealing device of this embodiment, when the holding member 9 is axially moved toward the one end in the axial direction with respect to the base member 2 due to an increase in the pressure inside the pipe 1, the outer peripheral portion of the sealing member 8 is pressed. The inner peripheral surface 8b of the pressed taper of the portion 8c is pressed by the outer peripheral surface 9b of the pressing taper of the holding metal 9, and the outer peripheral surface of the outer pressed portion 8c becomes the end 1 of the pipe 1.
a, and the inner peripheral region of the end surface on the other axial side of the seal member 8 is locally pressed by the inner peripheral pressing protrusion 9c of the holding member 9, and swells radially inward. The inner peripheral surface of the seal member 8 is pressed against the outer peripheral surface of the middle diameter portion 5b of the shaft member 5. For this reason, it is possible to more effectively improve the sealing performance on the inner and outer peripheral surfaces of the sealing member 8 and the prevention of the pipe sealing device from coming off from the end 1a of the pipe 1 in response to a rise in the pressure inside the pipe 1. Becomes

Accordingly, this pipe sealing device can sufficiently exhibit a sealing function even when the pressure inside the pipe 1 becomes high, while eliminating the need for a backup device for preventing the pipe sealing device from coming off.

(Embodiment 2) The pipe sealing apparatus of the present embodiment shown in FIG. 3 embodies the invention according to claim 1, 2, 4, 5 or 6.

In this pipe sealing device, a plurality of teeth 4d having a mountain-shaped cross section are provided on the inner peripheral surface 4c of the pipe clamp 4 constituting the clamp member.

The other structure is the same as that of the first embodiment.

Accordingly, in this pipe sealing device, the teeth 4d of the press contact inner peripheral surface 4c bite into the outer peripheral surface of the end 1a of the pipe 1 so that the press contact inner peripheral surface 4c of the pipe clamp 4 constituting the clamp member is in contact with the press contact inner peripheral surface 4c. End 1 of pipe 1
The mechanical coupling force with the outer peripheral surface of “a” increases. For this reason,
It is possible to further improve the retention of the pipe clamp 4 with respect to the end 1a of the pipe 1 and more effectively prevent the pipe sealing device from coming off from the end 1a of the pipe 1.

Other functions and effects are the same as those of the first embodiment.

Therefore, this pipe sealing device can sufficiently exhibit a sealing function even when the pressure inside the pipe 1 becomes high, while eliminating the need for a backup device for preventing the pipe sealing device from coming off.

(Embodiment 3) The pipe sealing device of the present embodiment shown in FIGS.
It embodies the invention according to 4, 5, or 6.

This pipe sealing device has the same configuration as that of the first embodiment except that the configurations of the base member 2 and the clamp member are changed.

That is, the base member 20 in this pipe sealing device is different from the base member 2 according to the first embodiment in that the boss portion 2d is eliminated and the base member 20 extends continuously in the circumferential direction and has a rectangular cross section. In addition, an engaging concave / convex portion 20c having a convex portion is provided on the outer peripheral surface of the base member 20 instead of the male screw portion 2c. The base member 20 is similar to the base member 2 according to the first embodiment.
A shaft hole 20a through which the medium diameter portion 5b of the shaft member 5 is inserted
And an opposing end surface 20 at which the end surface of the end 1a of the pipe 1 opposes.
b.

As shown in FIG. 6, the clamp member 30 in the pipe sealing device includes two semi-substantially cylindrical divided bodies 31, 31 obtained by equally dividing a substantially cylindrical member into two in the circumferential direction. It is composed of a pair of bolts 32, 32 and nuts 33, 33 as fastening means for fastening and integrating the divided bodies 31, 31.

When the pipe sealing device is mounted on the end 1 a of the pipe 1, each of the divided bodies 31, 31 is provided on the inner peripheral surface at one end in the axial direction with the engaging uneven portion 20 c of the base member 20. Engagement concave / convex portions 31a, 31a capable of engaging with the outer peripheral surface of the pipe 1 are provided on the inner peripheral surface of the other end side in the axial direction. ing. Further, a plurality of teeth 31c, 31c having a mountain-shaped cross section are provided on each of the inner circumferential surfaces 31b, 31b.

Further, a pair of tightening steps 31d, 31d are provided on one of the divided bodies 31 so as to face each other in the radial direction. Through holes 31e, 31e through which the shaft is inserted
Are respectively penetrated. Similarly, a pair of tightening steps 31d, 31d are provided on the other divided body 31 so as to face each other in the radial direction.
1d is provided with through-holes 31e, 31e, each of which is open to the division surface and through which the shaft of the bolt 32 is inserted. When the divided surfaces of the divided bodies 31, 31 are aligned with each other in the circumferential direction, the fastening steps 31d, 31d provided on the divided bodies 31, 31 are opposed to each other and the through holes 31 are formed.
Since e and 31e communicate with each other, the through holes 31e, 3e
1e and the nut of the bolt 32.
By screwing 3, the tightening steps 31 d of the divided bodies 31, 31 can be clamped and tightened between the head of the bolt 32 and the nut 33. By thus integrating the divided bodies 31, 31, the clamp member 30 formed of a substantially cylindrical member is formed.
The clamp member 30 in a state of being integrated by being tightened between the nut 2 and the nut 33 is constituted by the press contact inner peripheral surfaces 31b and 31b of the divided bodies 31 and 31 and is located at a position smaller than the outer diameter of the end 1a of the pipe 1. It has a hole with a small internal diameter.

This pipe sealing device having the above configuration can be mounted on the end 1a of the pipe 1 as follows.

First, the base member 20, the shaft member 5,
Tightening screw 6, nut 7, sealing member 8, and holding metal 9
Is assembled in the same manner as in the first embodiment. And
As shown in FIG. 4, a seal member 8 is attached to the end 1a of the pipe 1.
After the outer peripheral surface is inserted, the holding screw 9 is rotated relative to the base member 2 in the axial direction together with the shaft member 5 by rotating the tightening screw 6 in the same manner as in the first embodiment. . Accordingly, with the axial movement of the holding member 9 toward one end in the axial direction, the outer peripheral pressed portion 8c of the seal member 8 is compressed in the axial direction and the radial direction, and the outer peripheral surface of the outer peripheral pressed portion 8c is At the same time, the inner peripheral surface of the seal member 8 expands radially inward and is pressed against the outer peripheral surface of the middle diameter portion 5b of the shaft member 5.

Then, the engaged concave / convex portions 31a, 31a of the divided bodies 31, 31 are connected to the engaging concave / convex portions 20c of the base member 20.
While each of the divided bodies 31, 31 is
32 and each nut 33, 33 to integrate them.
As a result, each of the divided bodies 31, 31 moves in the centripetal direction, whereby the substantially cylindrical clamp member 30 formed by each of the divided bodies 31, 31 is reduced in diameter.
The inner peripheral surfaces 31b, 31b of the pressure contact 31 are end portions 1a of the pipe 1.
Are pressed against the outer peripheral surface of
The teeth 31c provided on the base 31b bite into the outer peripheral surface of the end 1a of the pipe 1.

In this way, in this pipe sealing device, each divided body 31, 31 is moved in the centripetal direction, and the clamp member 30, which is a substantially cylindrical member constituted by each divided body 31, 31, is reduced in diameter by fastening. Using power,
Since the clamp member 30 can be held on the outer peripheral surface of the end 1a of the pipe 1, by increasing the fastening force, the clamp member 30 can be firmly held on the outer peripheral surface of the end 1a of the pipe 1. It is possible to further improve the prevention of the pipe sealing device from coming off from the end 1a of the pipe 1.

Further, in the pipe sealing device of this embodiment, the press contact inner peripheral surfaces 31b, 31
As the tooth portions 31c, 31c of FIG. 2b bite into the outer peripheral surface of the end 1a of the pipe 1, the mechanical coupling force between the clamp member 30 and the outer peripheral surface of the end 1a of the pipe 1 is increased.
For this reason, the clamp member 3 with respect to the end 1a of the pipe 1
0 can be further improved, and the ability of the pipe sealing device to be prevented from coming off from the end 1a of the pipe 1 can be more effectively improved.

Other functions and effects, that is, a function of improving the sealing performance on the inner and outer peripheral surfaces of the sealing member 8 and the prevention of the pipe sealing device from coming off from the end 1a of the pipe 1 in accordance with the increase in the pressure inside the pipe 1. The effect is the same as that of the first embodiment.

Therefore, this pipe sealing device can sufficiently exhibit a sealing function even when the pressure inside the pipe 1 becomes high, while eliminating the need for a backup device for preventing the pipe sealing device from coming off.

(Embodiment 4) The pipe sealing apparatus of the present embodiment shown in FIG. 7 embodies the invention according to claim 1, 3, 4 or 6.

This pipe sealing device has the same configuration as that of the third embodiment except that the configurations of the base member 20 and the holding member 9 are changed.

That is, the base member 20 in this pipe sealing device has an annular recess 20d provided on the inner peripheral surface of the shaft hole 20a, and an O-ring 20e is provided in the annular recess 20d.

The holding member 9 in this pipe sealing device does not have the inner peripheral pressing projection 9c.

Therefore, in the pipe sealing device of the embodiment, the sealing performance on the outer peripheral surface of the middle diameter portion 5b of the shaft member 5 is improved by the fact that the sealing member 8 is compressed in the axial direction between the base member 20 and the holding member 9. The inner peripheral surface of the seal member 8 expands radially inward and is pressed against the outer peripheral surface of the shaft member 5, and the O-ring 20 e provided in the annular concave portion 20 d of the base member 20 is ensured. .

The other basic functions and effects are the same as those of the third embodiment.

Accordingly, the pipe sealing device can sufficiently exhibit a sealing function even when the pressure inside the pipe 1 becomes high, while eliminating the need for a backup device for preventing the pipe sealing device from coming off.

In the first to third embodiments, the outer peripheral pressed portion 8c having the pressed tapered inner peripheral surface 8b is provided in the outer peripheral region of the seal member 8 and the pressing taper outer peripheral surface 9b and the inner peripheral The example in which the pressing protrusion 9c is provided has been described. 1) An inner circumferential pressed portion having a pressed tapered outer peripheral surface is provided in the inner peripheral region of the seal member 8, and the pressing taper inner peripheral surface and the outer peripheral pressing are provided on the holding metal member 9. 2) Providing an outer peripheral pressed portion and an inner peripheral pressed portion on the outer peripheral region and the inner peripheral region of the seal member 8, and providing a pressing taper outer peripheral surface and a pressing taper inner peripheral surface on the holding member 9. 3) without providing either the outer peripheral pressed portion or the inner peripheral pressed portion on the seal member 8, providing at least one of the outer peripheral pressing protrusion and the inner peripheral pressing protrusion only on the holding metal 9; Seal member It is also possible to provide only the inner peripheral pressed portion in the inner peripheral region of 8 and to provide only the inner peripheral surface of the pressing taper on the holding metal 9.

The first to third embodiments and the above 1)
In the modes 4) to 4), an O-ring 20e can be added as in the fourth embodiment.

Further, in the above-described first to fourth embodiments, an example has been described in which the holding member 9 as the holding means is provided separately from the shaft member 5, but this holding means is provided integrally with the shaft member 5. You may. In this case, the nut 7 becomes unnecessary, and the large-diameter portion 5a is eliminated, and the shaft member 5 is inserted into the shaft hole 2a (20a) of the base member 2 (20) from the end on which the holding means is not provided. At the same time, it is necessary to take measures such as screwing the tightening screw 6 to the end.

In addition, in the above-described first and second embodiments, the tapered inner peripheral surface 3b whose diameter is reduced toward the other axial end is formed on the inner peripheral surface of the clamp base 3 at the other axial end. Although the example in which the taper outer peripheral surface 4b is provided on the pipe clamp 4 and the taper outer peripheral surface 4b is provided on the inner peripheral surface on the other axial side of the clamp base 3, the diameter of the tapered outer periphery is increased toward the other axial end side. In addition to the surface, the pipe clamp 4 may be provided with a tapered inner peripheral surface facing the tapered outer peripheral surface. In this case, the pipe clamp 4 is reduced in diameter by moving the clamp base 3 relative to the base member 2 toward the other end in the axial direction.

In the first and second embodiments,
The number of the slits 4a of the pipe clamp 4 may be two or more, and in the third and fourth embodiments, the clamp member 3 may be used.
It is also possible to divide 0 into three or more.

[0077]

As described above in detail, according to the pipe sealing device of the present invention, a backup device for preventing the pipe sealing device from coming off is not required, and a sufficient sealing function can be provided even when the inside of the pipe becomes high pressure. Because it can be used, it is possible to save space of equipment,
It is possible to improve the reliability of the pipe sealing device.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a pipe sealing device according to a first embodiment cut along an axial direction.

2A and 2B show a pipe clamp according to the pipe sealing device of the first embodiment, in which FIG. 2A is a longitudinal sectional view cut along an axial direction, and FIG. 2B is a side view of FIG. .

FIG. 3 is a longitudinal sectional view of the pipe sealing device of Embodiment 2 cut along an axial direction.

FIG. 4 is a longitudinal sectional view of the pipe sealing device according to a third embodiment, taken along an axial direction, for explaining a method of attaching the pipe to an end of the pipe;

FIG. 5 is a longitudinal sectional view of the pipe sealing device of the third embodiment cut along an axial direction.

6A and 6B show a clamp member according to the pipe sealing device of the third embodiment, wherein FIG. 6A is a front view as viewed from an axial direction (left side in FIG. 5), and FIG. 6B is a view as viewed from the right side of FIG. FIG.

FIG. 7 is a longitudinal sectional view of the pipe sealing device of Embodiment 4 cut along an axial direction.

FIG. 8 is a cross-sectional view for explaining a problem of the conventional pipe sealing device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Pipe 2 ... Base member 3 ... Clamp base | substrate (clamp member) 4 ... Pipe clamp (clamp member) 3b ... Tapered inner peripheral surface 4a ... Slit 4b ... Tapered outer peripheral surface 4c ... Pressure contact inner peripheral surface 4d ... Tooth part 5 ... Shaft Member 6 ... Tightening screw 8 ... Seal member 9 ... Pressing fitting (pressing means) 8b ... Pressed tapered inner peripheral surface 8c ... Outer peripheral pressed portion 9b ... Tapered outer peripheral surface 9c ... Inner peripheral pressing protrusion 20 ... Base member 30 ... Clamp Member 31… Divided body 31b… Crimping inner peripheral surface 31c… Tooth part 32, 33… Tightening means (32… Bolt, 33… Nut)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yukiichi Ueno 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Setuko Shimada 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation (72) Inventor Kenji Furuta 5-14 Midorigaoka, Toyota City, Aichi Prefecture Inside Daitoyo Seiki Co., Ltd. (72) Inventor Kusano Akihiro 5-14-14 Midorigaoka, Toyota City, Aichi Prefecture Inside Daitoyo Seiki Machinery Co., Ltd. (72) Inventor Okada Haruo 5-28-10 Hosoya-cho, Toyota City, Aichi Prefecture F World Co., Ltd. F-term (reference) 3J040 AA01 AA13 BA01 EA01 EA16 HA03 HA05 HA15

Claims (6)

[Claims] 1. A pipe sealing device mounted on a pipe end to seal the pipe end in a liquid-tight manner, wherein the pipe sealing device is disposed to face an end face of the pipe end and has a shaft hole. A base member formed of a disc-shaped member, and disposed on the outer peripheral surface of the pipe end and the outer peripheral surface of the base member, and one end in the axial direction corresponding to the outer side in the axial direction of the pipe has the outer periphery of the base member. Engaged with the surface,
A clamp member comprising a substantially cylindrical member having a press-contact inner peripheral surface pressed against an outer peripheral surface of an end of the pipe on an inner peripheral surface of the other end in the axial direction corresponding to an inner side in the axial direction of the pipe; A shaft member inserted into a shaft hole of the member, a substantially disk-shaped member disposed between the inner peripheral surface of the pipe end and the outer peripheral surface of the shaft member and having a shaft hole through which the shaft member is inserted; A seal member made of an elastic member, and integrally or separately radially outward from an outer peripheral surface of the shaft member at the other axial end so as to face an end surface of the seal member at the other axial end. And a pressing means extending in the axial direction with respect to the base member, and the base member and the pressing means with the axial movement of the pressing means to one end in the axial direction. The seal member is at least in the axial direction By being compressed, removal of the shaft member from the base member to the one end side in the axial direction is regulated, and the seal member swells radially inward and outward, and the outer peripheral surface of the shaft member and A pipe sealing device, which is configured to be pressed against an inner peripheral surface of the pipe end. 2. The clamp member is engaged with the base member such that one end in the axial direction is relatively movable in the axial direction,
A clamp base having a tapered inner peripheral surface whose diameter is reduced or increased toward the other end in the axial direction on the inner peripheral surface on the other end in the axial direction, and a tapered outer peripheral surface facing the tapered inner peripheral surface And a pipe clamp having an inner peripheral surface that is pressed against the outer peripheral surface of the pipe end, and having at least one slit in the circumferential direction and made of a substantially ring-shaped member that can be reduced in diameter and increased in diameter. The pipe sealing device according to claim 1, wherein: 3. The clamp member has at least two divided bodies each having the press-contact inner peripheral surface obtained by dividing a substantially cylindrical member into at least two parts in a circumferential direction, and has one end in the axial direction of each divided body as the base. 2. The pipe sealing device according to claim 1, further comprising a tightening unit that tightens and integrates each of the divided bodies while engaging the outer peripheral surface of the member. 4. An outer peripheral pressed portion having a pressed tapered inner peripheral surface whose diameter is increased toward the other end in the axial direction on an end surface on the other end in the axial direction. At least one of an inner peripheral pressed portion having a pressed tapered outer peripheral surface whose diameter is reduced toward the other end in the axial direction is integrally provided with the other end in the axial direction, and the pressing means is provided. At least one of a pressing taper outer peripheral surface facing the pressed taper inner peripheral surface of the outer peripheral pressed portion and a pressing taper inner peripheral surface facing the pressed taper outer peripheral surface of the inner peripheral pressed portion is provided. 4. The method according to claim 1, wherein
A pipe sealing device as described. 5. The pressing means has at least one of an inner peripheral pressing protrusion protruding from an inner peripheral region and an outer peripheral pressing protrusion protruding from an outer peripheral region on an end surface on one end side in the axial direction. Is provided.
The pipe sealing device according to 3 or 4. 6. The pipe sealing device according to claim 1, wherein at least one tooth portion having a mountain-shaped cross section is provided on the inner peripheral surface of the press contact.