JPS5936790Y2 - Patsuking - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a backing used when inserting and connecting the socket of one tube to the socket of the other tube.

As a backing for connecting the socket of one pipe by inserting it into the socket of the other pipe, for example, as shown in Japanese Utility Model Publication No. 49-26747, a There are backings with a sloped peripheral edge, but when such a backing is used at the connection between pipes, the elastic repulsive force of the sloped surface of the backing's peripheral edge against the pipe socket is low, and high pressure It also had the disadvantage that it did not have a sufficient water-stopping effect when exposed to water.

In order to improve this drawback, if the height and length of the protruding edges are uniformly increased, the insertion force required to insert the socket of one tube into the socket of the other tube through the backing will be reduced. This has the drawback that it is difficult to perform piping construction, and it is easy to damage the pipe insertion or pipe socket, making it undesirable for piping construction.

In view of the above facts, the present invention was made with the purpose of providing a backing that is easy to insert during piping construction and has a large water-stopping effect during high internal pressure.

The gist of the present invention is that a flange is provided on the outer peripheral surface of a cylindrical main body made of an elastic body and is inclined to one side along the circumferential direction, and a cross-sectional shape is formed along the circumferential direction on the outer inclined surface of the flange. The backing includes a substantially semicircular protrusion that is inclined in a direction opposite to the direction of inclination of the collar.

Hereinafter, the present invention will be explained with reference to an embodiment of the drawings.

1 is a cylindrical main body made of an elastic body, and on its outer peripheral surface,
A collar 2 inclined toward one end is provided in the circumferential direction, and the collar 2 is provided in the circumferential direction.
A concave groove 3 is provided in the circumferential direction on the outer peripheral surface of the inclined side of the flange 2, and a protrusion 4 having a substantially semicircular cross-sectional shape is provided in the circumferential direction on the slanted surface 21 on the outside of the slanted surface of the flange 2. The protrusion 4 is provided so as to be inclined toward the other end in the direction opposite to the direction of inclination, and a groove 5 is provided in the circumferential direction on the outer circumferential surface of the protrusion 4 on the inclined side.

The size of the fourth protrusion is determined based on the diameter of the pipe to be connected, that is, the distance between the inner surface of the socket and the outer surface of the socket, and the appropriate elasticity after the pipe is connected in consideration of the radial thickness of the cylindrical scraper 1. The dimensions may be such that repulsive force can be obtained.

For example, in the case of a reinforced plastic tube with a diameter of 500 mm to 1500 mm, it is sufficient that the cross-sectional shape is approximately semicircular with a radius of 3 to 8 mm.

In this way, by providing the protrusion 4 having a semicircular cross-sectional shape on the outer inclined surface 21 of the collar 2 so as to be inclined toward the other end in the direction opposite to the direction of inclination of the collar 2, the protrusion The strip 4 acts as an O-ring, and after the piping is connected, all of the elastic repulsive force of the protrusion 4 acts effectively in the direction perpendicular to the inner surface of the socket, significantly improving sealing performance.

In particular, the sealing performance against intruders from outside the pipe is significantly improved.

Note that the grooves 3 and 5 are not essential, but the grooves 3 and 5 are not essential.
By providing the concave groove 5, the flange 2 can be connected to the concave groove 3, and the protrusion 4 can be connected to the concave groove 5 by folding down, making it easy to insert the backing, and reducing internal or external water pressure during use. If added, the slope 22 or protrusion 4 on the inside of the tsuba 2
It has the advantage that water pressure can be easily applied to the inner inclined surface 42 and the self-sealing property is good.

In FIG. 1, the length l of the fin portion 23 having the sloped surface 22 on the inner side of the collar 2 is preferably approximately the same as the length L of the cylindrical main body 1.

This is because if the length l of the fin part 23 is too short, the connection part will become flat and bent due to the action of external loads such as earth pressure after being buried in the soil, and the inner surface of the socket and the top of the outer peripheral surface of the backing will A gap is created between the fins 23 and the fins 23 are turned over by the internal water pressure, resulting in seal leakage and incomplete sealing.On the other hand, if the length l of the fins 23 becomes too long, there will be no problem in terms of sealing performance. However, the insertion force at the time of connection increases,
However, the workability during piping construction is reduced.

Next, how the backing of the present invention is used will be explained.

Fit the backing of the present invention onto the outer circumferential surface of one of the pipe openings 6 so that the concave groove 3 of the cylindrical main body 1 is located at the tip of the pipe opening 6. .

With the backing attached, the insertion port 6 is inserted into the receiving lower of another pipe to form a connection part through the backing.

In this case, the flange 2 of the backing is connected to the cylindrical main body 1 on the inclined side.
The cylindrical body 1 is inserted so as to fall down toward the groove 3 provided on the outer circumferential surface of the cylindrical main body 1, and a protrusion 4 inclined in the opposite direction to the flange 2 is provided on the outer circumferential surface of the cylindrical main body 1 on the inclined side. The outer inclined surface 21 of the collar 2 and the outer inclined surface 41 of the protrusion 4 connected to the inclined surface 21 are inserted into the depressed groove 5 so that the outer inclined surface 21 of the collar 2 and the outer inclined surface 41 of the protrusion 4 connected to the inclined surface 21 are inserted into the depressed groove 3 and It is pulled toward the concave groove 5 and tightly adheres to the inner circumferential surface of the receiving lower of the tube with an extremely high elastic repulsive force to form a seal.

Further, the inner inclined surface 22 of the collar 2 and the inner inclined surface 42 of the protrusion 4 are provided for self-sealing when internal water pressure or external water pressure is applied.

When the protrusion 4 is inclined in the opposite direction to the collar 2, as in the diagonal embodiment, sealing performance and self-sealing performance are particularly promoted.

As shown in FIG. 3, a protruding peripheral edge 2' inclined in one direction in the axial direction is formed on the outer circumferential surface of the cylindrical main body 1', and the outer circumference of the cylindrical main body 1' in the direction of inclination of the protruding peripheral edge 2' When a conventional backing with a groove 3' on its surface is fitted into the socket 4' of one pipe and inserted into the socket 5' of the other pipe, as shown in Figure 4. , the elastic repulsion force of the protruding peripheral edge 2' against the socket 5' is low;
Sealability and self-sealability are insufficient.

As described above, the backing of the present invention is provided with a collar that is inclined to one side along the circumferential direction on the outer peripheral surface of the cylindrical main body made of an elastic body, and a collar that is inclined to one side along the circumferential direction is provided on the outer inclined surface of the collar. Since the protruding stripe having a substantially semicircular cross-sectional shape is provided so as to be inclined in the opposite direction to the inclination direction of the collar, this backing can be fitted into the socket of one pipe and inserted into the socket of the other pipe. When inserted into the tube, the outer inclined surface of the collar and the outer inclined surface of the protrusion connected thereto are stretched toward the ends of the respective tubular main bodies, so that the elastic repulsive force is extremely high. In addition to being in close contact, the sloped surface inside the brim provides self-sealing when high internal water pressure is applied.In particular, when an external load such as a tonosho acts on the connection, the connection becomes flat and bends, causing local damage. Even if the distance between the inner surface of the opening and the outer surface of the socket increases, if high internal water pressure is applied inside the piping, the outer circumference of the slanted collar will be pressed against the inner surface of the socket by the internal water pressure, so the connection part will be damaged. It provides perfect sealing, and does not require much insertion force when connecting, making piping construction easy.

In addition, the protrusions with a semicircular cross-sectional shape act as an O-ring, and after connection, all of the elastic repulsive force of the protrusions works effectively in the direction perpendicular to the inner surface of the socket, significantly improving sealing performance. That's what I do.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing one embodiment of the backing of the present invention, Fig. 2 is a cross-sectional view showing how the backing of Fig. 1 is used, Fig. 3 is a cross-sectional view showing a conventional backing, and Fig. 4 is a cross-sectional view showing the usage of the backing of the present invention. FIG. 4 is a sectional view showing how the backing of FIG. 3 is used. Explanation of symbols, 1... Cylindrical main body, 2...
Tsuba, 3...concave groove, 4...protrusion, 5...
...concave groove.

Claims (1)

[Scope of utility model registration request] A flange inclined to one side along the circumferential direction is provided on the outer peripheral surface of the cylindrical main body made of an elastic body, and a protrusion having a substantially semicircular cross-sectional shape along the circumferential direction is provided on the outer inclined surface of the flange. A backing provided to be inclined in a direction opposite to the direction of inclination of the collar.