JPS6113837Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a backup spring for backing up a sealing material in a pipe joint.

For example, in a mechanical pipe joint having a detachment prevention function as shown in Figs. A sealing material 4 interposed between the outer peripheral surface of the mouth 2 and this tapered seal seat 3 is pressed toward the back side of the socket 1 with a press ring 5 disposed opposite to the end of the socket to form a predetermined seal. A seal is secured, and a split lock ring 7 is fitted into the annular groove 6 formed on the outer circumferential surface of the socket 2, and this split lock ring 7 is engaged with the press ring 5 via the sealing material 4. This prevents the socket 2 from coming off from the socket 1. A backing is provided between the sealing material 4 and the split locking ring 7 to protect the sealing material 4, to hold the socket 1 and the insertion port 2 concentrically, and to further improve the separation prevention force. A spring 8 is interposed. By the way, when the tapered seal seat surface 3 extends to the position of the back-up spring 8 as shown in FIG. However, as shown in FIG. If the back spring 8 is located around the inner peripheral surface of the socket 1 and the outer peripheral surface of the socket 2 on the back side, and the gap between them is large or small, set the thickness of the back up spring 8 according to the small gap. As a result, the back-up spring 8 rattles in the gap, and
There was a problem that the back spring function was not fully utilized.

The object of the present invention is to provide a back-up spring for a pipe joint that can solve these problems.

In order to achieve the above object, the back-up spring of the pipe joint of the present invention has a cross section along the tube axis direction of the inner peripheral surface of the socket between the fitting surface parallel to the outer peripheral surface of the socket and the outer peripheral surface of the socket. A back-up spring mounted on a main annular member made of a hard elastic material having a radial thickness smaller than the gap between the fitting surface and the outer peripheral surface of the socket, the outer peripheral surface of the main annular member being made of a hard elastic material. An auxiliary annular member made of a soft elastic material that is easily deformed is fitted and fixed to the outside, and the total thickness in the radial direction of the main annular member and the auxiliary annular member is in an uncompressed state between the fitting surface and the outer circumferential surface of the insertion port. The structure is such that the gap is larger than the gap between the two holes.

According to this configuration, since the auxiliary annular member is elastically deformed relatively easily, it is easy to attach the back-up spring, and in the attached state, the gap between the outer peripheral surface of the main annular member and the fitting surface of the socket is reduced. Since there is an auxiliary annular member in a compressed state, the back up spring will not shake in the gap, and therefore, even if the gap is large or small, the back up spring will still be able to perform the functions expected of the back up spring, that is, the sealing material. The back end of the socket is protected over its entire surface, the socket and the socket are held concentrically, and the sealing material and back-up spring are in full contact with each other on opposing surfaces. Therefore, it fully fulfills its function of improving the ability to prevent withdrawal.

Hereinafter, one embodiment of the present invention will be described based on FIGS. 3 to 5.

In FIG. 3, 11 is a socket, and 12 is a socket inserted into the socket 11. The inner surface of the socket 11 has a tapered seal seating surface 1 that tapers at the end of the opening.
3, a substantially cylindrical fitting surface 14 on the rear side thereof, and a rear end stepped surface 15 extending in the radial direction at the rear end of the socket. As shown in FIG. 3, the fitting surface 14 and the outer circumferential surface of the insertion port 2 are parallel to each other in a cross section along the tube axis. A sealing material 16 having a substantially wedge-shaped cross section is provided between the tapered seal seat surface 13 and the outer peripheral surface of the insertion port 2.
is inserted, and adjacent to the back side of the socket, a back-up spring 17 connects the outer peripheral surface of the socket 2 and the fitting surface 1 of the socket 1.
4, and further adjacent to the back side of the socket, 1 is fitted into the annular groove 18 on the outer peripheral surface of the socket 2.
A split lock ring 19 is arranged. The sealing material 16 is secured to the socket 11 by a press ring 21 disposed facing the socket flange 20 on the outer periphery of the opening end of the socket 11.
The tapered seal seat surface 13 is pressed toward the back side.
and the outer circumferential surface of the socket 2 to ensure a predetermined seal. 22 is a T-shaped bolt that fastens the socket flange 20 and the press ring 21 and presses the press ring 21 toward the socket 11, and 23 is a nut. Further, the end of the sealing material 16 on the back side of the socket is received by the backup spring 17. As shown in FIG. 4, this back-up spring 17 consists of a main annular member 2 made of a hard elastic material such as hard rubber filled with cotton cloth.
An annular tongue-shaped auxiliary annular member 25 made of a soft elastic material such as soft rubber and having a tapered outer periphery is integrally fixed to the outer periphery of the auxiliary annular member 4. The member 25 is compressed as appropriate depending on the size of the gap between the outer peripheral surface of the insertion port 2 and the fitting surface 14. The thickness of the main annular member 24 in the radial direction is set to be appropriately smaller than the minimum value of the gap between the outer peripheral surface of the socket 2 and the fitting surface 14, and the average thickness of the auxiliary annular member 25 is set to be smaller than the minimum value of the gap between the outer peripheral surface of the insertion port 2 and the fitting surface 14. It is set so that an appropriate compression reaction force can be obtained even at the maximum value.
Note that the cross-sectional shapes of the main annular member 24 and the auxiliary annular member 25 are not limited to those shown in FIG. 4; for example, the main annular member 24 may have a trapezoidal cross-sectional shape as shown in FIG. Alternatively, the auxiliary annular member 25 may have a rectangular cross section instead of an annular tongue shape. Note that if the peripheral surface of the auxiliary annular member 25 is tapered, it can be easily attached.

According to such a backup spring 17, since the auxiliary annular member 25 is elastically deformed relatively easily, the backup spring 17 can be easily installed, and in the attached state, the backup spring 17 can be easily attached to the inner or outer periphery of the main annular member 24. Since the auxiliary annular member 25 in a compressed state is interposed in the gap between the two outer circumferential surfaces or the fitting surface 14,
The back-up spring 17 does not wobble in the gap, and therefore, even if the gap is large or small, the back-up spring 17 can perform the functions expected of the back-up spring, that is, the sealing material 16 can completely cover the back end of the socket. The socket 11 and the socket 12 are held concentrically, and the sealing material 16 and the back-up spring 1 are
7 are in full contact with each other on the opposing surfaces, thereby fully fulfilling the function of improving the detachment prevention force.

As explained above, according to the back-up spring of the pipe joint of the present invention, the back-up spring is installed between the fitting surface of the socket and the outer peripheral surface of the socket, which are parallel to each other in the cross section along the pipe axis direction. It relates to a ring, in which an auxiliary annular member made of a soft elastic material that deforms more easily than the hard elastic material is fitted and fixed on the outer peripheral surface of a main annular member made of a hard elastic material. At the same time, the total thickness of the main annular member and the auxiliary annular member in the radial direction is made to be smaller than the gap between the fitting surface and the outer peripheral surface of the insertion port in an uncompressed state. Since the gap is larger than the gap between the socket and the outer circumferential surface, it can be easily inserted between the fitting surface of the socket and the outer circumferential surface, which are parallel to each other in the cross section along the tube axis direction, and at the same time, the gap between the fitting surface of the socket and the Even if there is a gap between the outer circumferential surface of the mouth and the outer circumferential surface of the mouth, the auxiliary annular member can absorb the tolerance by being elastically compressed. It does not wobble and fully demonstrates its intended function as a back-up spring.

[Brief explanation of the drawing]

Figures 1 and 2 are longitudinal sectional views of a pipe joint using a conventional back-up spring, Figure 3 is a longitudinal sectional view of a pipe joint using a back-up spring according to the present invention, and Figure 4 is a longitudinal sectional view of a pipe joint using a back-up spring according to the present invention. FIG. 5 is a detailed cross-sectional view of one embodiment of the present invention, and FIG. 5 is a detailed cross-sectional view of a modification of the same. 11... Socket, 12... Socket, 13... Taper seal seat surface, 14... Fitting surface, 15... Inner step surface, 16... Seal material, 17... Backup spring, 18... ...Annular groove, 19...Single lock ring, 21...Press ring, 24...Main annular member, 25
...Auxiliary annular member.

Claims (1)

[Scope of utility model registration request] A back-up spring is installed between a fitting surface of the inner peripheral surface of the receptacle whose cross section along the tube axis direction is parallel to the outer peripheral surface of the receptacle and the outer peripheral surface of the receptacle, and whose thickness in the radial direction is equal to that of the fitting surface. An auxiliary annular member made of a soft elastic material that deforms more easily than the hard elastic material is fitted onto the outer peripheral surface of the main annular member made of a hard elastic material that is smaller than the gap between the mating surface and the outer peripheral surface of the insertion port, A back-up spring for a pipe joint, wherein the total thickness of the main annular member and the auxiliary annular member in the radial direction is larger than the gap between the fitting surface and the outer circumferential surface of the insertion port in an uncompressed state.