JPH0341189Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a movable type suitable for use in pipe connections where cleanliness is required, such as pipes for transferring food materials in food processing factories. This relates to pipe fittings.

[Prior Art] Conventionally, a swivel joint shown in FIG. 4 has been known as a movable pipe joint. In the swivel joint shown in this figure, the distal end of the second pipe fitting member 2 is fitted into the distal end of the first pipe fitting member 1 so as to be freely insertable and removable, and the first and second
The first and the second The pipe joint members are mutually rotatable about their axes and are not separated from each other.

A packing 6 is provided between the opposing end surfaces of the first and second pipe joint members 1 and 2 to airtightly close the space between them.
is installed. This packing 6 is arranged on the outer peripheral side of the protruding portion 2a of the second pipe joint member 2 so as not to protrude toward the inside of the pipe due to the negative pressure inside the pipe. In the figure, reference numeral 7 is a grease nipple, 8 is a dust seal, and 9 is an O-ring.

This kind of swivel joint has the first and second
Pipes are connected to the rear ends of the pipe joint members 1 and 2 by welding or the like.

[Problems to be solved by the invention] By the way, in the above swivel joint, the second
The protruding portion 2a of the pipe fitting member 2 is inserted into the inner peripheral side of the packing 6, and the packing 6 needs to be pressed toward the second pipe fitting member side 2 by the end surface of the first pipe fitting member 1. Therefore, a gap shown by T in the figure is provided at the butt portion of the two. For this reason, when the above-mentioned swivel joint is used as a pipe for transferring food materials, the food materials get into the gaps and rot, and are mixed into the food materials. Therefore, in the past, the swivel joint was removed and cleaned several times a day, but
In order to remove the swivel joint, it is necessary to remove the ball plug 4 one by one and pull out the ball 5 from the groove 3, which poses the problem of requiring a great deal of labor.

[Purpose of the invention] This invention was made in view of the above circumstances, and there is no gap between the joints of the pipe joint members, so it can be used hygienically as a joint for pipes for transferring food materials. It is an object of the present invention to provide a movable pipe joint that can be easily inspected and maintained.

[Means for Solving the Problems] The movable pipe joint of this invention has a flange portion having a larger diameter than the cylindrical body at the distal end of the cylindrical body. A pair of pipe fitting members provided so that their surfaces abut each other, and a first recess formed in an inner circumferential portion of at least one of the abutting surfaces of these pipe fitting members. A packing whose inner diameter is the same as the inner diameter of the pipe fitting member is attached to a concave portion formed in a member on the outer peripheral side of the packing on at least one of the abutting surfaces of the abutting portion to create an airtight space between the pipe fitting members. A slide ring is closed and is capable of slidingly contacting the end face of at least one of the pipe fitting members, and the slide ring is provided on the outer circumferential side of the flange portion of one of the pipe fitting members, and the inner circumferential surface thereof is A ring member whose diameter is gradually reduced toward the rear end side and is able to come into sliding contact with the outer circumferential surface of the flange portion via a bushing, and an outer periphery between this ring member and the flange portion of the other pipe fitting member. The split ring-shaped clamp member is provided on the side and presses the tapered portion formed on the outer edge of these parts to bring them into close contact and connect them.

[Function] In the movable pipe joint configured as described above, the one and the other pipe joint members connected to the pipe are kept in close contact with each other through the slide ring and the bush against movement around the axis of the pipe. Rotate and allow said movement. The inner packing prevents the creation of gaps that could become clogged with objects on the inner surface of the tube. In addition, the packing provided inside the pipe joint member is closely interposed between the opposing surfaces of the pipe joint member without forming a gap, thereby maintaining airtightness. At that time, the packing and slide ring are installed in their respective recesses, and by adjusting the depth of the recess and the thickness of the packing and slide ring as appropriate, the division of pressure applied to the packing and slide ring can be adjusted. , exhibits contradictory properties of airtightness and sliding properties. Also,
Since the pipe joint members are fastened together using a ring-shaped clamp member, uniform pressure is applied in the circumferential direction, thereby maintaining airtightness and slidability for a long period of time.

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a side sectional view showing a movable pipe joint according to an embodiment. Number 1 in the figure
0 is a first pipe joint member, and 11 is a second pipe joint member. The first pipe joint member 10 has a cylindrical body portion 1.
A flange portion 12 having a larger diameter than the body portion 10a is formed at the tip portion of the body portion 10a. The flange portion 12 has a rear end surface formed in a tapered shape whose diameter gradually decreases from the tip side to the rear end side,
The fitting portion 13 has a smaller diameter at the tip end of the outer periphery than the other portions. An annular recess 14 is formed in the end face of the tip of the flange portion 12, and an annular slide ring 15 is fitted into and fixed to the recess 14.

The slide ring 15 is made of a synthetic resin such as tetrafluoroethylene resin, and is pressed against the end surface of the second pipe joint member 11 so as to close the gap between the first pipe joint member 10 and the second pipe joint member 11. Its surface is made extremely smooth so that it can be airtightly closed and the first and second pipe joint members 10 and 11 can rotate relative to each other. Further, a packing 6 is fitted into an annular recess 12a formed in the inner peripheral portion of the flange portion 12. This packing 16 is the first
It airtightly closes the space between the pipe joint member 10 and the second pipe joint member 11, and its inner diameter is the same as the inner diameter of the first pipe joint member 10, and the inner peripheral surface and the first pipe joint member are The inner circumferential surface of the member 10 is made to continue smoothly.

On the other hand, the second pipe joint member 11 has a flange portion 17 formed at the distal end of a cylindrical body portion 11a whose inner diameter is the same as that of the first pipe joint member 10. The outer diameter of the flange portion 17 is set to be slightly smaller than the outer diameter of the slide ring 15, and its outer circumferential surface has a circular cross-section so that the diameter gradually decreases from the tip side to the rear end side. It has an arcuate convex curved surface. A ring member 18 is arranged on the outer peripheral side of the second pipe joint member 11.

The ring member 18 connects the second pipe joint member 11 to the first
It is attached to the pipe fitting member 10 so as to be rotatable about its axis, and its outer diameter is approximately the same as the outer diameter of the flange portion 12 of the first pipe fitting member 10, and the rear end side continuous with the outer periphery is A portion of the facing outer wall portion is formed into a tapered shape whose diameter gradually decreases from the leading end toward the rear end. An annular recess 19 that fits into the fitting portion 13 of the flange portion 12 is formed at the tip of the ring member 18 . Further, the inner wall portion 20 extending from the recess 19 to the inner circumferential surface 18a is formed into a concave curved surface having an arcuate cross section whose diameter gradually decreases from the leading end toward the rear end. This inner wall portion 20 has a bushing 2.
1 is fixed.

The bush 21 is made of the same material as the slide ring 15, and its inner peripheral surface is the same as that of the second slide ring 15.
The concave curved surface corresponds to the shape of the outer peripheral surface of the flange portion 17 of the pipe joint member 11 . Further, the tip side of the bush 21 is brought into close contact with the outer peripheral edge of the slide ring 15, thereby improving airtightness. This Bushu 21 is
By being pressed against the outer peripheral surface of the flange portion 17, the space between the second pipe joint member 11 and the ring member 18 is closed airtight, and the second pipe joint member 11 is rotated around its axis. The surface is extremely smooth. The ring member 18 and the flange portion 12 of the first pipe joint member 10 are connected to each other by a clamp member 22 attached to their outer peripheries.

As shown in FIG. 2, the clamp member 22 is formed by two substantially semicircular arc-shaped arms 23, 23, one end of which are rotatably connected to each other, and the other ends of which are fastened together with a screw member 24. It is. Here, the cross-sectional shape of the arm 23 is substantially U-shaped so as to expand toward the center side, and by tightening the screw member 24, the wall portion of the arm 23 forms an outer wall of the flange portion 12. The ring member 18 is pressed against the outer wall of the ring member 18 to connect and fix the two.

Such a movable pipe joint includes a first pipe joint member 1
0 and the rear end portions of the second pipe joint member 11 are respectively welded and used. When connecting the pipes, first, with the clamp member 22 removed, the first pipe joint member 1
0 and the end surfaces of the second pipe joint member 11 are butted against each other. Next, the ring member 18 is moved to the first pipe joint member 10 side, and the flange portion 1 is inserted into the recess 19.
The two fitting portions 13 are fitted together. Next, the clamp member 22 is attached to the outer peripheral sides of the flange portion 12 and the ring member 18, and the screw member 24 is tightened. Then, the flange part 12 and the ring member 18 are pressed and fixed together, and the outer peripheral part of the second pipe joint member 11 is pressed by the bush 21, so that the front end surface of the second pipe joint member 11 and the front end of the bush 21 are pressed together. The side portions are pressed against the slide ring 15. As a result, the second pipe joint member 11 and the ring member 18
and the first pipe joint member 10 are airtightly closed. However, since the surfaces of the slide ring 15 and the bush 21 are extremely smooth,
The second pipe joint member 11 is in a state where it can rotate relative to the first pipe joint member 10. Also,
Since the interior of the piping is kept airtight by the slide ring 15 and bushing 21, the seal 16 will not protrude into the interior due to negative pressure within the piping. In addition, when separating piping from each other,
The clamp member 22 can be removed by loosening the screw member 24.

In the above movable pipe joint, the ring member 18
The second pipe joint member 11 is connected to the first pipe joint member 10 by
Since the pipe is rotatably attached to the pipe, the structure can be greatly simplified, and the pipes can be attached and detached from each other extremely easily. Therefore, not only can the labor for maintenance and inspection of the piping be reduced, but also the costs can be reduced because the only parts that wear out and need to be replaced are the slide ring 15 and the bush 21. can. Furthermore, since the sliding contact portion is composed of the slide ring 15 and the bush 21 made of synthetic resin material, smooth relative rotation of the first and second pipe joint members 10 and 11 can be obtained without the need for oil supply. Furthermore, no gap is generated at the joint between the first pipe joint member 10 and the second pipe joint member 11, and the transferred material does not remain in the gap.
Therefore, it is extremely hygienic as a joint for pipes for transferring food materials.

In the above embodiment, the outer peripheral surface of the flange portion 17 of the first pipe joint member 11 is formed into a convex curved surface, but it may be formed into a tapered shape, for example. Further, the clamp member 22 is not limited to the above configuration, and may have any configuration as long as it connects the first pipe joint member 10 and the ring member 18 by pressing them against each other.

Next, FIG. 3 is a diagram showing another embodiment of the present invention. The movable pipe joint shown in this figure is constructed so that the inner circumferential surface of the bush 26 is in close contact with the outer circumferential surface of the slide ring 25. This movable pipe joint has a second pipe joint member 11 similar to the above embodiment.
is attached to the first pipe joint member 10 by a ring member 18 so as to be relatively rotatable around its axis, and a slide ring 25 and a bush 26 are brought into close contact with each other in order to improve airtightness inside the pipe. This produces similar effects.

[Effects of the invention] As explained above, in the movable pipe joint of this invention, a flange portion having a larger diameter than the cylindrical body is provided at the tip of the cylindrical body, and the axes are aligned with each other. A pair of pipe fitting members provided so that their distal ends abut each other, and a first recess formed in an inner circumferential portion of at least one abutting surface of the abutting portions of these pipe fitting members. A packing whose inner diameter is the same as the inner diameter of the pipe fitting member is attached to a concave portion formed in a member on the outer peripheral side of the packing on at least one abutting surface of the abutting portion, thereby airtightly creating an airtight space between the pipe fitting members. a slide ring that is closed and capable of slidingly contacting the end face of at least one of the pipe fitting members; A ring member whose diameter is gradually reduced toward the rear end side and is capable of sliding contact with the outer peripheral surface of the flange portion via a bushing, and a connection between this ring member and the flange portion of the other pipe fitting member. The movable pipe joint with the above structure is equipped with a split ring-shaped clamp member provided on the outer circumferential side and presses the tapered portions formed on the outer edges of these parts to tightly connect and connect them. In this system, one and the other pipe fitting members connected to the pipe rotate relative to each other while maintaining a close state through the slide ring and the bush against the movement around the axis of the pipe, allowing said movement, The packing provided inside the pipe joint member is closely interposed between the opposing surfaces of the pipe joint member without forming a gap, thereby maintaining airtightness and preventing objects from clogging. At that time, the packing and slide ring are installed in their respective recesses, and by adjusting the depth of the recess and the thickness of the packing and slide ring as appropriate, the division of pressure applied to the packing and slide ring can be adjusted. , exhibits contradictory properties of airtightness and sliding properties. In addition, since the pipe joint members are fastened together using a ring-shaped clamp member,
Uniform pressure is applied in the circumferential direction, providing excellent effects such as maintaining airtightness and sliding contact for a long period of time.

[Brief explanation of the drawing]

1 and 2 are views showing one embodiment of the present invention, in which FIG. 1 is a side sectional view showing a movable pipe joint, FIG. 2 is a view taken in the direction of the arrow in FIG. The figures show another embodiment of the present invention, in which a side sectional view shows a movable pipe joint, and FIG. 4 is a side sectional view showing an example of a conventional swivel joint. DESCRIPTION OF SYMBOLS 1...First pipe joint member, 2...Second pipe joint member, 6...Packing 10...First pipe joint member, 1
0a...Body part, 11...Second pipe joint member, 11a
...Body part, 12...Flange part, 12a, 14...
... recess, 15 ... slide ring, 16 ... seal, 17 ... flange section, 18 ... ring member, 21 ... button, 25 ... slide ring, 26 ... button.

Claims (1)

[Claims for Utility Model Registration] A pair of cylindrical bodies in which a flange portion having a larger diameter than the body is provided at the distal end thereof, the axes of which are aligned with each other, and the distal end surfaces are butted against each other. A packing member having an inner diameter that is the same as the inner diameter of the pipe fitting member, which is attached to a recess formed in the inner peripheral side of at least one abutting surface of the abutting portions of these pipe fitting members, and the above-mentioned It is installed in a recess formed in a member on the outer peripheral side of the packing on at least one abutting surface of the abutting portion, and airtightly closes the gap between the pipe fitting members, and is connected to the end face of at least one of the pipe fitting members. a slide ring that is capable of sliding contact; and a slide ring that is provided on the outer circumferential side of a flange portion of one pipe fitting member, and whose inner circumferential surface is gradually reduced in diameter toward the rear end of the one pipe fitting member. A ring member that can be slidably contacted with the outer circumferential surface of the flange portion via a bushing; and a taper provided on the outer circumferential side of the ring member and the flange portion of the other pipe fitting member, and formed on the outer edge portions thereof. 1. A movable pipe joint comprising a split ring-shaped clamp member that presses the two parts to tightly connect and connect the two parts.