JPS626379Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a pipe joint, and particularly to a pipe joint that enables desired expansion and contraction movement in the axial direction of a pipe.

(Conventional Example) Conventionally, this type of pipe joint allows for a certain amount of expansion and contraction of the pipe, taking into account the expansion and contraction of the pipe due to temperature changes or the movement of the pipe in the axial direction due to earthquakes, etc., and prevents damage to the pipe or pipe joint. It prevents you from doing so. However, in conventional pipe joints, the pipe does not come off from the pipe joint main body by using a retaining ring, so that the amount of expansion and contraction of the pipe is very small.

(Problems to be solved with the design) Therefore, if the pipe were to move several centimeters due to an earthquake, etc., the pipe or the pipe fitting itself would inevitably be destroyed. On the other hand, when the pipes are connected in a telescopically movable manner, the pipes may come off from the pipe joint body, and in this case, there is an inconvenience that large-scale construction work is required to reconnect the pipes.

(Purpose of the invention) This invention was made in view of the above-mentioned circumstances.
The purpose is to provide a pipe joint that can cause the pipe to expand and contract as desired in the axial direction, and that can reliably restrict further expansion and contraction once the tube has reached a certain position. That is.

(Structure of the device) In order to achieve the above object, the present invention includes a pipe fitting body into which a pipe to be connected is inserted from the open end, and a pipe fitting body that is loosely fitted onto the outer circumferential surface of the connecting portion of the pipe to be connected. It has a press ring that is screwed together, and has first and second tapered surfaces that gradually become smaller in inner diameter as they move toward the front and rear ends, respectively, at two points on the front and rear parts of the inner circumferential surface of the press ring with a required interval. , a pair of circumferential grooves are formed on each rear end side, and the inner surfaces are supported by back-up springs in each of these circumferential grooves, and are slidably fitted to the outer circumferential surface of the connecting portion of the connected pipe. A pair of retaining rings having edge portions are provided to fit into the first and second tapered surfaces, and the edge portions of each retaining ring are fitted into the outer peripheral surface of the connection portion of the connected pipe. This pipe joint is provided with a groove extending in the circumferential direction and is positioned between the two retaining rings to connect the pipe joint main body and the pipe to be connected.

(Embodiment) Hereinafter, the present invention will be described based on an embodiment shown in the drawings.The present invention will be described below with reference to a pipe joint body 1 into which a pipe to be connected 2 is inserted from an open end 1a, and an outer circumferential surface of a connecting portion 2a of the pipe to be connected 2. The push ring 3 is loosely fitted into the pipe joint body 1 and screwed onto the pipe joint body 1. That is, the pipe fitting main body 1 has a threaded portion 1b formed on the inner periphery of its open end, and a threaded portion 1b on the inner circumferential surface of the pipe fitting main body 1 that gradually becomes smaller in inner diameter as it goes inward. 3 taper surface 1c is formed, and this third taper surface 1c is formed.
The connected pipe 2 is connected continuously to the minimum inner diameter part of the tapered surface 1c.
A central hole 1d is formed into which the material can be inserted with some play. Moreover, the push ring 3 is connected to the pipe joint main body 1.
The push ring 3 has a threaded portion 3a on its outer periphery that is screwed into the threaded portion 1b of the push ring 3, and a central hole 3b that is loosely fitted to the outer periphery of the pipe joint body 1.
b First and second tapered surfaces 3e and 3f whose inner diameters gradually become smaller as they move toward the front and rear ends 3c and 3d, respectively, at the front and rear two locations with the required interval on the inner circumferential surface.
A pair of circumferential grooves 3g and 3h are formed on the front and rear ends 3c and 3d, respectively, and these circumferential grooves 3g,
3h, a pair of retaining rings 6, 7 are supported on their inner surfaces by back-up springs 4, 5 made of an elastic material such as rubber, and are in sliding contact with the outer peripheral surface of the connecting portion 2a of the connected pipe 2. It is provided to fit into the first and second tapered surfaces 3e and 3f.
These retaining rings 6 and 7 are made of metal, for example, and have a notch 6a in a part of their circumference.
7a so that its inner diameter can be expanded or contracted, and fourth and fifth tapered surfaces 6b and 7b are formed on the outer circumferential surface thereof to abut against the first and second tapered surfaces 3e and 3f, respectively. At the same time, fourth and fifth tapered surfaces 6b,
Edge portions 6c', 7c' are formed at the minimum inner diameter portions of the sixth and seventh tapered surfaces 6c, 7c. is the connection part 2 of the connected pipe 2
It is slidably fitted onto the outer circumferential surface a, and the cross-sectional shape of the edge portions 6c' and 7c' is appropriately rounded as shown in FIGS. Further, the outer circumferential surface of the connecting portion 2a of the connected pipe 2 has a V-shaped cross section in the circumferential direction, which is formed to be fitted and locked to the edge portions 6c' and 7c' of the respective retaining rings 6 and 7. A concave groove 8 is provided. This concave groove 8 is positioned between the two retaining rings 6 and 7, and the pipe joint body 1 and the pipe to be connected 2 are connected. Further, a lubricant ring 9 made of a lubricant such as carbon is attached to the innermost part of the third tapered surface 1c of the pipe joint body 1, and this lubricant ring 9 has an eighth taper formed on its outer peripheral surface. The surface 9a abuts the third tapered surface 1c, and the inner circumferential surface 9b comes into sliding contact with the outer circumferential surface of the connecting portion 2a of the connected tube 2. Further, on the outside of the lubricant ring 9, an airtight gasket 10 made of an elastic material such as rubber is interposed between the third tapered surface 1c and the outer peripheral surface of the connecting portion 2a of the connected pipe 2. It will be installed. And this gasket 1
A retainer ring 11 made of a synthetic resin material or the like is interposed between the press ring 3 and the front end 3c of the push ring 3.

The pipe 2 to be connected, which has the lubricant ring 9, gasket 10, and retainer ring 11 fitted from the distal end side to the outer periphery of the connecting portion 2a, is inserted into the pipe joint body 1 from the open end 1a. Next, the threaded portion 3a of the press ring 3 equipped with the back-up springs 4, 5 and retaining rings 6, 7 is inserted into the threaded portion 1 of the pipe joint body 1.
b, and the press ring 3 is tightened and screwed onto the pipe joint body 1. By this tightening operation of the push ring 3, the push ring 3 moves the gasket 10 and lubricant ring 9 through the retainer ring 11 between the first tapered surface 1c of the pipe joint body 1 and the outer peripheral surface of the connecting portion 2a of the connected pipe 2. The pipe to be connected 2 is connected to the pipe fitting body 1 via the retaining rings 6, 7 and the gasket 10, and in this connected state, the concave groove 8 of the pipe to be connected 2 is connected to both of the retainers. For example, it should be located approximately in the center between the rings 6 and 7.

The operation of the pipe joint configured as described above will be explained. When an external pulling force A in the axial direction as shown in FIG. 3 is applied to the connected pipe 2, the connected pipe 2 moves until the concave groove 8 reaches the retaining ring 7, and at that position, the retaining ring 7 is removed. The diameter is reduced along the 22nd tapered surface 3f, and the concave groove 8 is fitted and locked into the edge portion 7c', thereby preventing the pipe 2 to be connected from being pulled out any further. Furthermore, when a compressive external force B in the axial direction is applied to the connected pipe 2 as shown in FIG. 4, the connected pipe 2 moves until the concave groove 8 reaches the retaining ring 6, and at that position, the retaining ring 6 is reduced in diameter along the first tapered surface 3e, and the concave groove 8 is fitted and locked in the edge portion 6c', thereby preventing further movement of the connected pipe 2 in the compression direction. Therefore, a pair of retaining rings 6,
7 can be set arbitrarily to allow the desired expansion and contraction movement of the connected pipe 2 in the axial direction. Moreover, when the connected pipe 2 has expanded and contracted to a certain position, it is possible to make the connected pipe 2 move further. The expansion and contraction movement of the tube can be reliably restricted, and there is no possibility that the connected pipe 2 will be pulled out from the pipe joint body 1.

Further, in the above embodiment, when the connected pipe 2 is pulled out, the lubricant from the lubricant ring 9 is interposed between the gasket 10 and the outer circumferential surface of the connecting part 2a of the connected pipe 2, and the gasket 10 and the connected pipe 2 are pulled out. The lubricant protects the gasket 10 by acting as a lubricant between the gasket 10 and the connecting pipe 2, and prevents the gasket 10 from being rolled into the center hole 1d side of the pipe fitting body 1 when the connected pipe 2 is compressed. Ring 9 prevents and serves to protect gasket 10.

In addition, in the above embodiment, the case where the connected pipes 2, 2 are respectively connected to both open ends 1a, 1a of the pipe joint body 1 is illustrated, but the present invention is not limited to this, and only one of the connected pipes 2, 2 is connected Of course, the present invention can also be applied to the case where the other pipe to be connected is connected to the pipe joint body formed integrally with the pipe.

Further, the groove 8 may have various cross-sectional shapes such as a U-shaped cross section or a semicircular cross-section, in addition to the V-shaped cross section of the above embodiment.

(Effects) As explained above, the pipe joint of the present invention has
a pipe joint body into which a pipe to be connected is inserted from the open end;
a press ring that is loosely fitted onto the outer peripheral surface of the connecting portion of the pipe to be connected and is screwed onto the pipe joint body, and a front end and a rear end are provided at two positions on the inner peripheral surface of the press ring with a required interval, respectively. The first one has an inner diameter that gradually becomes smaller as it goes to the side.
and a pair of circumferential grooves each having a second tapered surface on the front and rear end sides, each inner side of which is supported by a back-up spring in each of these circumferential grooves, and which slides on the outer circumferential surface of the connecting portion of the connected pipe. A pair of retaining rings having edge portions that are movably fitted are provided to be fitted to the first and second tapered surfaces, and each of the retaining rings is provided on the outer circumferential surface of the connecting portion of the connected pipe. A concave groove extending in the circumferential direction is formed so that the edge portion of the pipe is fitted and locked, and this concave groove is positioned between both of the retaining rings to connect the pipe joint body and the pipe to be connected. Therefore, even if the connected pipe moves due to an earthquake, etc., the pipe can slide relative to the fitting body, and even if the sliding movement exceeds the setting, the edge part of the retaining ring will not be connected. It is fitted and locked into the concave groove of the pipe, and further movement is prevented, thereby preventing the pipe to be connected from coming out of the joint body and preventing it from fitting too much. This eliminates the conventional problems mentioned at the beginning, such as destruction of the pipe fitting body and the pipe coming off from the pipe fitting body.
It can extremely effectively prevent damage caused by natural disasters.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a vertical cross-sectional view showing the overall configuration, FIG. 2 is a vertical cross-sectional view showing an enlarged view of the same essential parts, and FIGS. 3 and 4 show different functions. FIG. 2 is a vertical sectional view corresponding to FIG. 2 showing the state. DESCRIPTION OF SYMBOLS 1... Pipe joint main body, 1a... Open end of pipe joint main body, 1b... Threaded part of pipe joint main body, 2... Connected pipe, 2a... Connection part of connected pipe, 3... Push ring, 3
a...Screw part of push ring, 3c, 3d...front of push ring,
Rear end, 3e...First tapered surface, 3f...Second tapered surface, 3g, 3h...Pair of circumferential grooves, 4,5...Backup spring, 6,7...Pair of retaining rings, 6c ', 7c'...Edge part of retaining ring, 8
... Concave groove, 9 ... Lubricant ring, 10 ... Gasket, 11 ... Retainer ring.

Claims (1)

[Scope of utility model registration request] It has a pipe fitting main body into which a pipe to be connected is inserted from the open end, and a press ring that is loosely fitted onto the outer circumferential surface of the connection part of the pipe to be connected and is screwed into the pipe fitting main body, and the press ring has a A pair of circumferential grooves are formed at the front and rear two locations with a required interval, each having first and second tapered surfaces that gradually become smaller in inner diameter toward the front and rear end sides, respectively. A pair of retaining rings each having an edge portion supported on the inner side by a back-up spring in a circumferential groove and slidably fitted to the outer circumferential surface of the connecting portion of the connected pipe; A concave groove extending in the circumferential direction is provided to fit into the tapered surface and is formed on the outer circumferential surface of the connecting portion of the pipe to be connected so that the edge portion of each of the retaining rings is fitted and locked, and the concave groove A pipe joint characterized in that a groove is located between the two retaining rings to connect the pipe joint main body and the pipe to be connected.