JP2000249272A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely perform work for connecting a pipe joint and a bellows without leakage by using the fastening operation for connecting a bellows by a screw member to simultaneously form a flange part for stopping the screw part, and also simply grasping the fastening state of the screw member from the outside. SOLUTION: This pipe joint includes a joint main body A having a pipe connecting opening 2 in which a bellows is inserted and connected, a pressure sleeve 4 having an engagement part 4a engaged with a groove part in the outer peripheral surface of the bellows, a screw member 5 for pressing and moving the pressure sleeve 4 until the forward end part of the bellows positioned between an insert regulating part 2a formed on the innermost side in the pipe connecting opening 2 and the pressure sleeve 4 is deformed to be buckled with the screw-engaging operation of the joint main body A to the fastening side for a screw part 2b in the state of being coated on the bellows, and a fastening confirming means B for confirming the fastening state of the screw member to the screw part 2b of the joint main body A from the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for communicating a flexible bellows pipe used for transporting a fluid such as tap water or gas, or for guiding cables such as optical fibers. . Specifically, a joint body having a pipe connection port into which a bellows tube is inserted and connected, and freely attachable to the inside of the pipe connection port of the joint body from the pipe axis direction, and
A pressure sleeve having an engaging portion that engages with a groove on the outer peripheral surface of the bellows tube, and a screwing operation to a screw side of a threaded portion of the joint main body in a state of being jacketed on the bellows tube, A screw member that presses and moves the pressure sleeve to a state where the tip side portion of the bellows tube located between the insertion regulating portion formed on the back side in the pipe connection port and the pressure sleeve is buckled and deformed. Pipe fittings.

[0002]

2. Description of the Related Art In a pipe joint of this type, when the screw member is screwed to a tightening side, a tip side portion of a bellows tube located between an insertion restricting portion in a pipe connection port and a pressurizing sleeve is formed. ,
It is buckled and deformed in the form of a flange while being pressed against the insertion restricting portion side in the pipe connection port. Can be suppressed. That is, there is an advantage that a flange portion for preventing the screw member from falling off can be formed at the same time by using a tightening operation for connecting the bellows tube by the screw member. In the conventional pipe joint, the tip side portion of the bellows pipe located between the insertion restricting portion in the pipe connection port and the pressurizing sleeve is connected with the screwing operation of the screw member to the tightening side. When being buckled and deformed into a flange shape while being pressed against the insertion restricting portion side in the connection port portion, an interval between facing surfaces of the opening end surface of the pipe connection port portion and the flange portion of the screw member in the tube axis direction is set. (For example, Japanese Utility Model Laid-Open No. 1-71292, Japanese Utility Model Laid-Open No. 2-141).
794).

[0003]

In a conventional pipe joint, when a bellows pipe covered with a heat insulating material made of a synthetic resin such as foamed polyethylene is connected to the pipe connection port of the joint body, firstly, first, While a screw member is sheathed on the bellows tube, the end of the tubular covering body of the bellows tube has a length substantially equivalent to the sum of the length of the tip side portion to be buckled and deformed into a flange shape and the mounting length of the pressure sleeve. After cutting and removing with a cutter etc., the exposed end of the bellows tube body exposed by this cutting and removal,
The pressure sleeve body is externally provided at a position separated by an interval corresponding to the length of the tip side portion that is buckled and deformed from the tip. In this state, after inserting the pressurized sleeve provided on the exposed end of the bellows tube main body into the pipe connection opening of the joint main body, the screw member is screwed into the screw portion of the joint main body to operate the screw member. The tip side portion of the bellows tube located between the insertion regulating portion and the pressure sleeve is buckled and deformed into a flange shape. However, since the screw member is tightened while buckling and deforming the distal end portion of the bellows tube into a flange shape, the rotational operation resistance of the screw member becomes large, and as a result, the distal end portion of the bellows tube becomes a predetermined flange. Even when the screw member is not buckled and deformed, it is sometimes mistaken that the tightening operation is completed, and the screwing operation of the screw member is interrupted. For this reason, the connection between the joint body and the bellows tube becomes incomplete, and in particular, the connection between the insertion restricting portion in the pipe connection port and the insertion end surface of the bellows tube is pinched by the screwing operation of the screw member. A pipe joint in which an annular sealing material is interposed, or an annular sealing material pressed between an outer peripheral surface of a tip side portion of a bellows tube buckled and deformed in a flange shape and an inner peripheral surface of a pipe connection port portion. In any of the interposed pipe joints, the sealing performance between the bellows pipe and the joint body is reduced, and leakage is likely to occur.

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and its main problem is to prevent the screw member from falling off by utilizing a tightening operation for connecting the bellows tube by the screw member. The joint of the joint body and the bellows tube can be securely connected in a leak-free state while the tightened state by this screw member can be easily grasped from the outside while allowing the flange portion of the joint to be formed at the same time. It is to provide a pipe joint that can be performed.

[0005]

According to a first aspect of the present invention, there is provided a pipe joint according to the first aspect of the present invention, wherein a tightening check for externally checking a tightening state of a screw member with respect to a screw portion of the joint body is provided. That means is provided. According to the characteristic configuration, when the screw member is tightened while the tip side portion of the bellows tube is buckled and deformed into a flange shape, the tightening check means tightens the screw member with respect to the screw portion of the joint body. Since the state can be checked from the outside, even if the rotational operation resistance of the screw member increases with the tightening operation, the tip side portion of the bellows tube is seated in a predetermined flange shape like a conventional pipe joint. Interruption of the tightening operation of the screw member before bending deformation can be suppressed. Therefore, while making it possible to simultaneously form the flange portion for preventing the screw member from falling off by utilizing the tightening operation for connecting the bellows tube by the screw member, the tightening confirmation means can be used to form the screw member. By confirming the tightening state, anyone can reliably perform the connection work between the joint body and the bellows tube without any leakage.

According to a second aspect of the present invention, in the pipe joint according to the present invention, the tightening check means is interposed between opposing surfaces of the threaded portion of the joint body and the threaded member so as to be rotatable from the outside. It consists of a ring-shaped or C-shaped confirmation operation body. According to the above-mentioned characteristic configuration, when the screw member is tightened while the tip side portion of the bellows tube is buckled and deformed into a flange shape, a ring-shaped or C-shaped confirmation operation body constituting the tightening confirmation means. It is only necessary to tighten the screw member until rotation operation becomes impossible, so that it is possible to easily check the connection work between the joint body and the bellows tube, and furthermore, the screw part of the joint body and the screw member It is only necessary to interpose a ring-shaped or C-shaped confirmation operation body between the opposing surfaces of the above, so that it is not necessary to largely modify other components and to manufacture a pipe joint having a tightening confirmation means. It can be manufactured advantageously in terms of surface.

According to a third aspect of the present invention, in the pipe joint according to the third aspect of the present invention, the tightening confirming means may be arranged such that the tightening check means moves in a pipe axis direction with respect to a threaded portion or a threaded member of the joint body in accordance with the operation of the threaded member. A movable body attached in a state of being pushed and moved, and a visual confirmation unit for visually confirming a tightened state of the screw member from a position of the movable body with respect to the screw portion or the screw member of the joint body in the pipe axis direction. The point is that it is composed. According to the above-mentioned characteristic configuration, when the screw member is tightened while deforming the distal end side portion of the bellows tube into a flange shape, the movable body attached to the screw portion or the screw member of the joint main body includes a screw member. The movable body is pushed and moved in the pipe axis direction with the tightening operation.By reading the position of this movable body in the pipe axis direction with the visual check unit, the connection work between the joint body and the bellows pipe is completed. Can be easily checked. In other words, it is possible to quickly check whether or not the connection work between the joint body and the bellows tube has been completed without any special operation.
It can be done easily.

[0008] A characteristic configuration of the pipe joint according to a fourth aspect of the present invention is that an operation knob protruding outward in the radial direction is formed on the confirmation operation body. According to the characteristic configuration, the rotation operation for confirming the tightening by the confirmation operation body can be easily performed by using the operation knob protruding outward in the radial direction from the confirmation operation body. The forgetting to confirm can be suppressed by the presence of the operation knob protruding outward in the radial direction.

According to a fifth aspect of the present invention, there is provided a pipe joint according to a fifth aspect of the present invention, wherein the visual confirmation section engages and holds the movable body in the axial direction of the pipe such that the movable body is engaged with the movable section. The point is that it is constituted by the formed slit. According to the above-mentioned characteristic configuration, the slit between the slit and the movable body is provided by using the slit for engaging and holding the movable body with respect to the screw portion or the screw member of the joint main body so as to be movable in the pipe axis direction. Since the tightened state of the screw member can be visually confirmed from the relative positional relationship in the axial direction, for example, in order to visually confirm the position of the movable body with respect to the threaded portion of the joint body or the screw member in the tube axis direction. As compared with the case where the scale is added, the number of processing steps for the threaded portion or the threaded member of the joint body can be reduced, and the manufacturing cost of the pipe joint provided with the tightening confirmation means can be reduced.

According to a sixth aspect of the present invention, the pipe joint is characterized in that the pressure is clamped in the pipe connection port between the insertion restricting portion in the pipe connection port and the insertion end face of the bellows pipe. The present invention is characterized in that a retaining means for locking and holding the annular sealing material is provided. According to the above-mentioned characteristic configuration, the annular sealing material is interposed between the insertion restricting portion in the connection port and the insertion distal end surface of the bellows tube in a state of being pinched from the tube axis direction. When the screw member is screwed into the tightening side, the distal end portion of the bellows tube located between the annular seal member and the pressure sleeve is buckled and deformed into a flange shape while being pressed against the annular seal member. Since the tip surface of the bellows tube bites into the annular seal material, and at the same time, the contact area in the radial direction between the tip side portion of the bellows tube buckled and deformed in a flange shape and the annular seal material increases, for example, As disclosed in Japanese Utility Model Laid-Open Publication No. 1-71292 and Japanese Utility Model Laid-Open Publication No. 2-141794, the outer peripheral surface of the distal end side portion of the bellows tube buckled and deformed into a flange shape is attached to the inner peripheral surface of the annular sealing material. Compared to the case of crimping, between the bellows tube and the fitting body Sealing performance can be increased. In addition, since the stopper means for locking and holding the annular sealing material is provided in the pipe connection port of the joint body, for example, a bellows pipe is connected to the pipe connection port of the joint body from below. Even under the required construction conditions, the annular sealing material installed in the pipe connection port does not fall off, making it possible to handle the members roughly by that much, and sealing the bellows pipe to the joint body. Work can be streamlined and facilitated.

According to a seventh aspect of the present invention, the pipe joint is provided with a diameter reducing means for displacing the pressure sleeve to the diameter reducing side in accordance with the screwing operation of the screw member to the tightening side. There is in the point. According to the above-mentioned characteristic configuration, the distal end portion of the bellows tube can be easily inserted from the outside along the tube axis direction by utilizing the displacement of the pressure sleeve toward the diameter increasing side. Also, when the screw member is screwed to the tightening side, the pressing sleeve is displaced to the reduced diameter side by the diameter reducing means, whereby the engagement between the engaging portion of the pressing sleeve and the groove of the bellows tube is performed. The joint can be deepened, and as a result, the tip of the bellows tube located between the insertion restricting portion and the pressure sleeve is securely buckled and deformed into a predetermined shape while being pressed against the insertion restricting portion. Can be
Desired high sealing performance can be obtained stably.

According to an eighth aspect of the present invention, in the pipe joint according to the present invention, the diameter-reducing means includes a screw member of the outer peripheral surface of the pressing sleeve which is screwed into the screwing side. The present invention is characterized in that the pressure-receiving surface is formed of a tapered diameter-reducing operation pressure receiving surface formed at a portion contacting the inner peripheral surface side end. According to the above-mentioned feature, the diameter of the engagement between the engaging portion of the pressure sleeve and the groove of the bellows tube is deepened by the diameter reducing means, so that the desired high sealing performance can be stably obtained. However, since only the tapered pressure-reducing operation pressure-receiving surface is formed on the outer peripheral surface of the pressure sleeve, the number of members does not increase, and the diameter-reducing means is advantageously configured in terms of structure and cost. be able to.

A ninth aspect of the present invention is the pipe joint according to the first aspect of the present invention, wherein the diameter reducing means includes a pressurizing sleeve with a screwing operation of the screw member on the inner peripheral surface of the screw member. In that it is formed of a tapered diameter-reducing operation pressing surface formed at a portion that comes into contact with the outer peripheral surface side end portion. According to the characteristic configuration, the diameter of the engagement portion of the pressurizing sleeve and the groove of the bellows tube are deepened by the diameter reducing means, so that a desired high sealing performance can be stably obtained. However, since only the tapered diameter-reducing operation pressing surface is formed on the inner peripheral surface of the screw member, the number of members is not increased, and the diameter reducing means is advantageously configured in terms of structure and cost. be able to.

[0014] The characteristic feature of the pipe joint according to claim 10 of the present invention is that the diameter reducing means includes:
A tapered diameter-reducing operation pressure receiving surface formed at a portion that comes into contact with an inner peripheral surface side end of the screw member as the screw member is screwed into the tightening side; and an inner periphery of the screw member. The surface is formed of a tapered diameter-reducing operation pressing surface formed at a portion that comes into contact with the pressure receiving surface of the pressure sleeve along with the screwing operation of the screw member to the tightening side. is there. According to the above-mentioned characteristic configuration, the engagement margin between the engaging portion of the pressure sleeve and the groove of the bellows tube is deepened by the diameter reducing means, so that the desired high sealing performance can be stably obtained. While
Since only the pressure receiving surface and the pressing surface for the diameter reduction operation are formed on the outer peripheral surface of the pressure sleeve and the inner peripheral surface of the screw member, the number of members does not increase, and the diameter reducing means is replaced by a structural surface and It can be configured advantageously in terms of cost. Moreover, as compared with the case where only one of the pressure receiving surface and the pressing surface for the diameter reduction operation is used, the screw member can be made more compact in the radial direction of the pressing sleeve and the screw member. The pressing sleeve can be reliably and smoothly reduced in diameter with the screwing operation to the tightening side.

According to a eleventh aspect of the present invention, the pipe joint is characterized in that the pressure sleeve is configured to be swingable in a radial direction with a specific point in the circumferential direction as a fulcrum or substantially a fulcrum. is there. According to the above-mentioned characteristic configuration, as compared with the case where the pressure sleeve is configured in a substantially C-shape that can be elastically deformed to the enlarged diameter side and the enlarged diameter side, the operation of attaching the pressure sleeve to the bellows tube is performed. Can be done quickly and easily with less effort.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] FIGS.
An example of a bellows pipe 1 constituting a part of a water supply piping system, showing a pipe joint for sealingly connecting and connecting a flexible bellows pipe 1 covered with a heat insulating material made of a synthetic resin such as foamed polyethylene,
A metal or synthetic resin joint body A having a pipe connection port 2 into which the bellows tube 1 is inserted and connected, and an insertion restricting section formed on the inner side of the pipe connection port 2 of the joint body A Annular sealing material (packing) made of a synthetic resin (for example, made of non-asbestos felt) or metal pressed between the insertion regulating surface 2a and the insertion end surface 1a of the bellows tube 1 in the tube axis X direction. 3 and a plurality of annular grooves 1b formed in the outer peripheral surface of the bellows tube 1 which can be mounted in the tube connection port portion 2 in the tube axis X direction and selectively in the radial direction. A pressure sleeve 4 made of a synthetic resin (for example, made of polyacetal) or a metal having an annular engagement portion 4a that can be engaged, and formed on the inner peripheral surface of the pipe connection port 2 of the joint body A. A male screw part 5 which can be screwed into the female screw part 2b from the tube axis X direction.
a, and is located between the annular sealing member 3 and the pressurizing sleeve 4 with the operation of screwing the female screw portion 2b to the tightening side in a state of being jacketed by the bellows tube 1. A screw member 5 made of metal or synthetic resin for pressing and moving the pressure sleeve 4 to a state where the tip side portion 1c of the bellows tube 1 is buckled and deformed is provided.

As shown in FIG. 2, the pressure sleeve 4 has a pair of semicircular split sleeves 4A divided in the circumferential direction and an outer peripheral surface of one adjacent end of both split sleeves 4A. Flexible bonding tape 4 applied over
B of the joining tape 4B.
The split sleeve body 4A is configured to be freely swingable in a radial direction by using a tape portion located between adjacent ends of the split sleeve bodies 4A, which is a specific location in the circumferential direction of the pressure sleeve 4, as a fulcrum or substantially a fulcrum. And a tube axis X formed between the other adjacent ends of the two split sleeve bodies 4A.
Within the width of the slit 4b along the direction, the two divided sleeve bodies 4A are configured to be deformable to the reduced diameter side.

Tightening check means B for externally checking the tightening state of the screw member 5 with respect to the female screw portion 2b of the joint main body A, and with the screwing operation of the screw member 5 to the tightening side. A diameter-reducing means C for displacing the pressure sleeve 4 to a diameter-reducing side; and a temporary fixing for temporarily holding the screw member 5 encased in the bellows tube 1 in a state in which the screw member 5 can be moved in the tube axis X direction. A means E is provided, and a pipe is provided in the pipe connection port 2 of the joint body A between the insertion restricting surface 2a in the pipe connection port 2 and the insertion distal end face 1a of the bellows pipe 1. A retaining means D is provided for locking and holding the annular sealing material 3 pressed in the axis X direction in a predetermined mounting posture.

The bellows tube 1 is made of metal (for example, copper).
And a cylindrical covering 1B made of synthetic resin for covering the outer peripheral surface of the bellows tube main body 1A. As shown in FIG. 2
When the bellows tube 1 is hermetically connected to the end, the end of the tubular covering body 1B is connected to the length of the tip side portion 1c of the bellows tube main body 1A, which is buckled and deformed in the form of a flange, and the mounting length of the pressure sleeve 4. A region substantially corresponding to the sum is cut and removed with a cutter or the like.

The tightening confirming means B includes an opening-side end face 2e of the female screw portion 2b of the joint main body A facing in the pipe axis X direction.
And a ring-shaped synthetic resin (for example, polyethylene, hard rubber, or the like) or a metal that is interposed between the opposing surfaces of the screw member 5 and the large-diameter cylindrical portion 5A with the stepped surface 5b so as to be rotatable from the outside. The outer peripheral surface of the large-diameter cylindrical portion 5A of the screw member 5 and the joint are provided at a plurality of positions (three positions in the present embodiment) of the outer peripheral edge of the confirming operation member 6 in the circumferential direction. An operation knob 6a projecting radially outward from the outer peripheral surface of the pipe connection port 2 of the main body A is integrally formed, and a plurality of inner circumferential edges of the confirmation operating body 6 (in this embodiment, three positions). Each of the two portions) has a drop-in prevention projection 6b which can be hooked on a valley of the male screw portion 5a in a state where the screw member 5 is allowed to pass through the male screw portion 5a in the tube axis X direction. Is formed. Therefore, when the screw member 5 is screwed to the tightening side, the checking operation body 6 constituting the tightening checking means B includes the opening side end surface 2e on the joint body A side and the step surface 5b on the screw member 5 side. By screwing the screw member 5 until the rotary member can no longer be rotated due to the pressure of the bellows tube 1, the tip of the bellows tube 1 located between the annular seal member 3 and the pressurized sleeve 4. Side part 1
c can be reliably buckled and deformed into a predetermined flange shape while being pressed against the annular sealing material 3. Therefore, it can be easily confirmed from the outside whether or not the distal end portion 1c of the bellows tube 1 has been buckled and deformed into a predetermined flange shape, and it is only necessary to rotate the confirmation operation body 6 to confirm. Therefore, the operation of sealingly connecting the bellows tube 1 to the joint body A can be simplified. In addition, even when checking the connection state between the bellows tube 1 and the pipe joint, the checking operation body 6
By just seeing whether or not rotates, the connection status of both is quickly,
It can be easily confirmed.

The diameter reducing means C comes into contact with the inner peripheral surface side end of the screw member 5 in the outer peripheral surface of the pressure sleeve 4 as the screw member 5 is screwed into the tightening side. The tapered pressure-receiving surface 4d for diameter reduction operation formed at the portion, and the compression sleeve 4 is shrunk with the screwing operation of the screw member 5 on the inner peripheral surface of the screw member 5 into the screwing side. Between the tapered diameter-reducing operation pressing surface 5d formed at a portion contacting the diameter operation pressure-receiving surface 4d and the female screw portion 2b in the pipe connection port 2 and the insertion restricting surface 2a. The pressure sleeve 4 is moved and guided in the tube axis X direction while restricting the radial expansion deformation of the pressure sleeve 4. In other words, the engaging portion 4a of the pressure sleeve 4 and the groove 1 of the bellows tube 1 are guided.
b while the pressure sleeve 4 is maintained at the outer diameter at which the engagement margin with the predetermined engagement margin becomes the predetermined engagement margin, the inner peripheral surface of the pipe connection port 2 is slidably moved and guided along the pipe axis X direction. And a tapered shape formed at a stepped portion corresponding to a boundary between the female screw portion 2b and the diameter-enhancing guide surface 2c on the inner peripheral surface of the pipe connection port 2. Diameter reduction guide surface 2d
And a tapered diameter-reducing guide surface 4f formed at an outer corner on the pressing surface 4e side of the pressure sleeve 4 in a state of being in surface contact with the diameter-reducing guide surface 2d from the tube axis X direction. Have been.

When the screw member 5 is screwed to the tightening side, the pressing surface 5d for the diameter reduction operation of the screw member 5 is moved in accordance with the screwing operation of the screw member 5, and the diameter of the pressing sleeve 4 is reduced. As the pressure sleeve 4 comes into contact with the pressure receiving surface 4d for operation and the pressure sleeve 4 is pressed, the reduced diameter guide surface 4f of the pressure sleeve 4 is connected to the female screw portion 2b on the pipe connection port 2 side and the diameter expansion guide. It comes into contact with the reduced-diameter guide surface 2d formed at the boundary with the surface 2c.
In this state, when the screw member 5 is further screwed to the tightening side, the pressing surface 5d of the screw member 5 comes into contact with the pressure receiving surface 4d of the pressing sleeve 4, and the reduced-diameter guide surface 4 of the pressing sleeve 4
The pressure sleeve 4 is elastically reduced in diameter by the contact between the f and the reduced diameter guide surface 2d on the pipe connection port 2 side. When the outer diameter of the pressure-sleeve 4 to be reduced in diameter becomes smaller than the inner diameter of the diameter-increasing regulating guide surface 2c, the pressure sleeve 4
Is pressed and moved along the diameter-enhancing regulating guide surface 2 c, and the distal end portion 1 c of the bellows tube 1 located between the annular sealing material 3 and the pressure sleeve 4 is pressed into contact with the annular sealing material 3 to form a flange. Is buckled.

The retaining means D is annularly mounted on a portion of the diameter-increasing guide surface 2c of the pipe connection port 2 and separated from the insertion-regulating surface 2a by a dimension slightly larger than the thickness of the annular sealing member 3. The retaining projections 9 are integrally formed so as to protrude, and move over the annular retaining projections 9 at each of a plurality of circumferential locations (three locations in the present embodiment) of the outer peripheral edge of the annular sealing material 3. A locking projection 3a which is elastically deformable to an outer diameter capable of forming the same is integrally formed. Further, the annular retaining projection 9 has an annular inclined surface 9a for guiding the overhanging movement of the locking projection 3a of the annular sealing material 3. Is formed.

The temporary fixing means E comprises a temporary fixing body 10 provided on the screw member 5 in a state capable of being pressed against the outer peripheral surface of the tubular covering 1B of the bellows tube 1.
Reference numeral 0 denotes a temporary fixing projection having a substantially triangular cross section and an annular shape integrally formed on the inner peripheral surface of the screw member 5 in a state of being pressed against the outer peripheral surface of the tubular covering 1B by utilizing its elastic restoring force. It is composed of The minimum inner diameter of the temporary fixing projection 10 is
Smaller than the maximum outer diameter of the outer peripheral surface of the cylindrical coating 1B,
Further, it is configured to be larger than the maximum outer diameter of the outer peripheral surface of the bellows tube main body 1A. Further, of the two annular inclined surfaces of the temporary fixing projection 10, one of the first annular inclined surfaces opposed to the pressing sleeve 4 in the tube axis X direction is used for the diameter reducing operation of the diameter reducing means C. The second annular inclined surface is formed as a pressing surface 5d, and the other second annular inclined surface is formed as a tapered pipe insertion guide surface 5e having a larger diameter toward the upper side in the insertion direction of the bellows tube 1.

The other end of the joint main body A has a male thread 8a for communicating with other pipes and various devices.
Is integrally formed so as to communicate with the pipe connection port 2.

[Second Embodiment] FIG. 7 shows the joint body A
Shows another embodiment of the tightening confirmation means B for externally confirming the tightening state of the screw member 5 with respect to the female screw portion 2b of FIG.
This can be externally rotated between an opposing surface between the opening end surface 2e of the female screw portion 2b of the joint body A and the stepped surface 5b of the large-diameter cylindrical portion 5A of the screw member 5 which are opposed to each other in the pipe axis X direction. Of the C-shaped confirmation operation body 6 interposed in an appropriate state, and each of a plurality of (in this embodiment, three) circumferential positions of the outer peripheral edge of the confirmation operation body 6 is provided with a screw member 5. An operation knob 6a projecting radially outward from the outer peripheral surface of the large-diameter cylindrical portion 5A and the outer peripheral surface of the pipe connection port 2 of the joint body A is integrally formed. At each of a plurality of positions (three positions in the present embodiment) in the circumferential direction of the male screw portion 5a in a state where the movement of the screw member 5 with respect to the male screw portion 5a in the tube axis X direction is allowed. A catchable projection 6b that can be caught is integrally formed. The confirmation operation body 6 is configured to be elastically deformable on the diameter increasing side. The opening width of the confirmation operation body 6 is increased while the diameter of the male screw portion 5a of the screw member 5 is increased from the outside in the diameter direction. The opening width is configured so that it can be mounted. Since other configurations are the same as those described in the first embodiment, the same components are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.

[Third Embodiment] FIGS. 8 to 10 show another embodiment of the tightening check means B for checking the tightening state of the screw member 5 with respect to the female screw portion 2b of the joint body A from the outside. This is for the female screw portion 2b of the joint body A,
A movable body 11 made of synthetic resin which is mounted in a state of being pushed and moved in the direction of the pipe axis X along with the tightening operation of the screw member 5.
And a visual confirmation unit 12 for visually confirming the tightened state of the screw member 5 from the position of the movable body 11 with respect to the screw portion 2b of the joint body A in the tube axis X direction. The visual check section 12 engages and holds the movable body 11 movably in the pipe axis X direction, and the female thread section 2 of the pipe connection port section 2 is held.
It is constituted by a slit formed at one place in the circumferential direction of b along the tube axis X direction.

As shown in FIG. 10, the side edge portions 2g of the pipe connection port portion 2 located on both sides in the width direction of the slit 12 are such that the slit width becomes wider toward the radially inner side. The movable body 11 is slidable from the tube axis X direction on both sides of the movable body 11 with respect to the V-shaped side edge portion 2g. Is formed with a fitting recess 11a.

Further, the movable body 11 is screwed into the tightening side of the screw member 5 so that the distal end portion 1c of the bellows tube 1 located between the annular seal member 3 and the pressurizing sleeve 4 is attached. Is buckled and deformed into a predetermined flange shape while being pressed against the annular sealing material 3, the first contact surface 2 h of the pipe connection port 2 on the inner side of the slit 12 from the X axis direction.
Stopper surface 11b, male screw portion 5a of screw member 5
And a second stopper surface 11c which is in contact with the step surface 5b from the tube axis X direction.

When the screw member 5 is tightened while the distal end portion 1c of the bellows tube 1 is buckled and deformed into a flange shape, the movable body 1 attached to the slit 12 on the joint body A side.
1 is pushed in the direction of the tube axis X along with the tightening operation of the screw member 5, and the distal end portion 1c of the bellows tube 1 is buckled and deformed into a predetermined flange shape. The first stopper surface 11b and the end surface 2h on the inner side of the slit 12 of the pipe connection port 2 abut, and the second stopper surface 11c of the movable body 11 and the opening end surface 5c of the male screw portion 5a of the screw member 5
And the movable body 11 covers the slit 12. Therefore, the female screw portion 2b of the joint body A
Using a slit 12 for engaging and holding a movable body 11 movably in the tube axis X direction.
It is possible to visually confirm the tightened state of the screw member 5 from the relative positional relationship between the movable member 11 and the movable body 11 in the pipe axis X direction. Compared with a case where a scale or the like for visually confirming the position in the axis X direction is added, the pipe connection port portion 2 of the joint main body A is provided.
The number of processing steps for the tool is small, and the tightening confirmation means B
Thus, it is possible to reduce the manufacturing cost of the pipe joint provided with. Since other configurations are the same as those described in the first embodiment, the same components are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.

Fourth Embodiment FIGS. 11 to 13 show another embodiment of the tightening check means B for checking the tightening state of the screw member 5 with respect to the female screw portion 2b of the joint body A from the outside. The movable member 15 is attached to the male screw portion 5a of the screw member 5 in a state where the movable member 15 is pushed and moved in the tube axis X direction along with the tightening operation of the screw member 5, and the screw member 5 And a visual confirmation unit 16 for visually confirming the tightened state of the screw member 5 from the position of the movable body 15 in the direction of the tube axis X with respect to.

The visual confirmation section 16 engages and holds the movable body 15 movably in the direction of the tube axis X, and
Is formed at one location in the circumferential direction of the male screw portion 5a along the tube axis X direction.

As shown in FIG. 13, among the male screw portions 5a of the screw member 5, side edge portions 5f located on both sides in the width direction of the slit 16 have a larger slit width toward the inner side in the radial direction. The movable body 15 is slid from the tube axis X direction on both side surfaces of the movable member 15 with respect to the V-shaped side edge portion 5f. A fitting recess 15a is formed to movably fit.

Further, the movable body 15 is screwed into the tightening side of the screw member 5 so that the distal end portion 1c of the bellows tube 1 located between the annular seal member 3 and the pressurizing sleeve 4 is attached. Is buckled into a predetermined flange shape while being pressed against the annular sealing material 3, a first stopper which comes into contact with the stepped surface 5 b located on the inner side of the slit 16 of the screw member 5 from the pipe axis X direction. A surface 15b and a second stopper surface 15c that is in contact with the opening end face 2e of the pipe connection port 2 from the pipe axis X direction are formed.

When the screw member 5 is tightened while the distal end portion 1c of the bellows tube 1 is buckled and deformed into a flange shape, the movable body 1 attached to the slit 16 on the screw member 5 side.
5 is pushed and moved in the direction of the tube axis X in accordance with the tightening operation of the screw member 5, and when the distal end portion 1c of the bellows tube 1 is buckled and deformed into a predetermined flange shape, the movable body 15 The first stopper surface 15b and the step surface 5b on the back side of the slit 16 of the screw member 5 are in contact with each other, and the second stopper surface 15c of the movable body 15 is in contact with the opening-side end surface 2e of the pipe connection port 2. Thus, the slit 16 is covered by the movable body 15. Therefore, a slit 16 for engaging and holding the movable body 15 movably in the tube axis X direction with respect to the male screw portion 5a of the screw member 5 is used, and the slit 16 and the movable body 15 are connected to each other. The screw member 5 is determined based on the relative positional relationship in the pipe axis X direction.
Can be visually confirmed.

The other configuration is the same as the configuration described in the first embodiment.
The same reference numerals as those of the embodiment are appended, and the description thereof is omitted.

[Other Embodiments] (1) Confirming operation body 6 constituting the tightening confirming means B
Can be arbitrarily selected as long as it can be externally rotated between the opposing surfaces of the threaded portion of the joint body A and the threaded member 5. (2) In each of the above embodiments, the pressing sleeve 4
Is composed of a pair of semi-circular split sleeve bodies 4A divided into two in the circumferential direction, and a joining tape 4B as joining means for joining one adjacent end of both split sleeve bodies 4A so as to be freely opened and closed. , But is not limited to this configuration
A slit may be formed at one location in the circumferential direction of the pressurizing sleeve 4 along the pipe axis X direction, so that the pressurizing sleeve 4 is configured to be elastically deformable to an increased diameter side and a reduced diameter side. . (3) The material, shape, and size of the joint main body A, the annular seal material 3, the pressurizing sleeve 4, and the screw member 5 constituting the pipe joint of the present invention are determined by screwing the screw member 5 into the tightening side. By the pressing movement of the pressurizing sleeve 4 accompanying the operation, the distal end portion 1c of the bellows tube 1 located between the annular seal member 3 and the pressurizing sleeve 4 is seated in a sealed state in which the bellows tube 1 is pressed against the annular seal member 3. Any material can be selected as long as it can be bent. (4) In each of the above-described embodiments, between the insertion restricting surface 2a in the pipe connection port portion 2 and the insertion distal end surface 1a of the bellows tube 1,
The outer peripheral surface of the distal end side portion 1c of the bellows tube 1 and the inner peripheral surface of the pipe connection port 2 which are interposed with the annular sealing material 3 which is squeezed in the tube axis X direction but are buckled and deformed in a flange shape. An annular seal member pressed between them may be provided and implemented. (5) Further, the diameter reducing means C may be replaced with the pressing surface 5d for reducing the diameter of the screw member 5 described in the first embodiment, the pressure receiving surface 4d for reducing the diameter of the pressing sleeve 4, or the pressing sleeve 4. Of the diameter-reducing guide surface 4f or any one of the diameter-reducing guide surfaces 2d formed at the boundary between the recess 7 on the side of the pipe connection port 2 and the diameter-restricting guide surface 2c, or an appropriate combination thereof. You may comprise. In short, as the diameter reducing means C, as the screw member 5 is screwed into the tightening side,
Any configuration may be used as long as the pressure sleeve 4 can be elastically deformed or displaced toward the reduced diameter side. (6) In each of the above embodiments, the description has been made using the bellows tube 1 covered with a synthetic resin, but the embodiment is performed using the bellows tube 1 made of metal or synthetic resin having no synthetic resin coating layer. May be. (7) In each of the above-described embodiments, the temporary fixing means B for temporarily fixing and holding the screw member 5 encased in the bellows tube 1 in a state in which the screw member 5 can be moved and operated in the tube axis X direction is a cylindrical member of the bellows tube 1. Although the temporary fixing member 10 provided on the screw member 5 in a state capable of being pressed against the outer peripheral surface of the coating 1B was used, the present invention is not limited to this configuration. A temporary fixing ridge elastically pressed against the inner peripheral surface of the member 5 is formed along the tube axis direction, or the outer peripheral surface of the bellows tube 1 and the inner peripheral surface of the screw member 5 face each other. A temporary fixing protrusion or a ridge which is pressed against each other may be formed at each of the portions to be implemented.

[Brief description of the drawings]

FIG. 1 is an exploded sectional view of a pipe joint according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of a pipe joint with a partial cutout.

FIG. 3 is a sectional view of the bellows tube immediately before insertion.

FIG. 4 is a cross-sectional view showing a maximum insertion state of a bellows tube;

FIG. 5 is a perspective view of a bellows tube when connected.

FIG. 6 is a cross-sectional view when a bellows tube is connected.

FIG. 7 is a partially cutaway exploded perspective view showing a pipe joint according to a second embodiment of the present invention.

FIG. 8 is a perspective view of a main part of a pipe joint according to a third embodiment of the present invention.

FIG. 9 is a partial cross-sectional view when a bellows tube is connected.

FIG. 10 is an enlarged sectional view of a main part.

FIG. 11 is a perspective view of a main part of a pipe joint according to a fourth embodiment of the present invention.

FIG. 12 is a cross-sectional view when a bellows tube is connected.

FIG. 13 is an enlarged sectional view of a main part.

[Explanation of symbols]

 Reference Signs List A Joint body B Tightening checking means C Diameter reducing means D Detachment means X Pipe shaft core 1 Bellows tube 1a Insertion tip 1b Groove 1c Tip side 2 Pipe connection port 2a Insertion regulation part (insertion regulation face) 2b Screw part (Female thread portion) 2c Diameter expansion regulating guide surface 3 Annular seal material 4 Pressing sleeve 4a Engagement portion 4d Pressure reducing surface for diameter reduction operation 5 Screw member 5a Screw portion (male thread portion) 5d Pressure reduction surface for diameter reduction operation 6 Confirmation Operation body 10 Temporary fixing body (temporary fixing projection) 11 Movable body 12 Visual confirmation unit (slit) 15 Movable body 16 Visual confirmation unit (slit)

Claims (11)

[Claims] 1. A joint body having a pipe connection port into which a bellows pipe is inserted and connected, and an outer peripheral surface of the bellows pipe, which can be mounted in the pipe connection port of the joint body from a pipe axis direction. A pressurizing sleeve having an engaging portion that engages with the groove portion of the joint body; A threaded member which presses and moves the pressure sleeve to a state where the tip side portion of the bellows tube located between the insertion regulating portion formed on the back side and the pressure sleeve is buckled and deformed. A pipe joint provided with a tightening check means for externally checking a tightened state of the screw member with respect to the screw portion of the joint body. 2. A ring-shaped or C-shaped confirmation operation body interposed between opposing surfaces of a threaded portion and a threaded member of a joint main body so as to be rotatable from the outside. The pipe joint according to claim 1, wherein the pipe joint is configured. 3. A movable body which is mounted in such a manner that said tightening confirming means is pushed and moved in a direction of a tube axis with respect to a screw portion or a screw member of a joint main body along with a screwing operation of the screw member. The pipe joint according to claim 1, further comprising: a visual confirmation unit for visually confirming a tightened state of the screw member from a position of the movable body with respect to the screw part of the joint body or the screw member in the tube axis direction. 4. The pipe joint according to claim 2, wherein an operation knob portion protruding outward in the radial direction is formed on the confirmation operation body. 5. A threaded portion or a slit formed in a threaded member of the joint body in a state where the visual confirmation portion engages and holds the movable body movably in the axial direction of the tube. The described pipe fitting. 6. A retainer for retaining and retaining an annular seal material clamped between an insertion restricting portion in the pipe connection port and an insertion end face of the bellows pipe in a pipe connection port of the joint body. The pipe joint according to any one of claims 1 to 5, wherein a means is provided. 7. The method according to claim 1, further comprising a diameter reducing means for displacing the pressing sleeve to a diameter reducing side in accordance with a screwing operation of the screw member to the tightening side. The described pipe fitting. 8. A portion of the outer peripheral surface of the pressure sleeve which comes into contact with an inner peripheral surface side end of the screw member as the screw member is screwed into the tightening side on the outer peripheral surface of the pressure sleeve. 8. The pipe joint according to claim 7, comprising a tapered pressure-receiving surface for diameter reduction operation formed on the pipe. 9. A portion of the inner peripheral surface of the screw member which comes into contact with an outer peripheral surface side end of the pressure sleeve as the screw member is screwed into the tightening side of the screw member. 8. The pipe joint according to claim 7, comprising a tapered diameter-reducing operation pressing surface formed at the bottom surface. 10. A portion of the outer peripheral surface of the pressure sleeve which comes into contact with an inner peripheral surface side end of the screw member as the screw member is screwed into the tightening side on the outer peripheral surface of the pressure sleeve. Abuts against the pressure receiving surface of the pressurizing sleeve as the screw member is screwed into the screwing side of the inner peripheral surface of the screw member. 8. The pipe joint according to claim 7, comprising a tapered pressing surface for diameter reduction operation formed at the portion. 11. The tube according to claim 1, wherein the pressure sleeve is configured to be freely swingable in a radial direction with a specific point in the circumferential direction as a fulcrum or a substantially fulcrum. Fittings.