JPS6346788Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a sealing device for a swivel joint.

In the basic configuration of a swivel joint, the inner hole of the joint body connected to one pipe is
A joint pipe in the shape of a cap connected to the other pipe is formed to fit and rotate freely, and the sliding peripheral surface between the inner hole of the joint body and the joint pipe is formed so that the joint pipe passes through the joint. Sealing means are provided against the pressure fluid.

By the way, the general sealing structure of conventional swivel joints is simple, consisting of an O-ring fitted onto the sliding surface, and therefore the sealing performance is not sufficient, especially when the fluid pressure suddenly increases. In addition to being unable to respond to such fluctuations, leaks may occur, and O-rings are easily damaged due to scale, sludge, etc. getting caught in the pipes and fluids, leading to premature leaks and operational failures. There were flaws.

The present invention has been made in order to eliminate the above-mentioned drawbacks. Namely, the purpose of the present invention is to provide a swivel joint sealing device that has sufficient sealing performance in accordance with the fluid transport conditions. There is a particular thing.

Hereinafter, the present invention will be explained based on an illustrated embodiment.

The swivel joint sealed with the sealing device of the embodiment is as shown in FIGS. 1 to 3.
A horizontal hole 2 and a downward hole 3 are bored inside the joint body 1, and both holes 2 and 3 communicate in a T-shape at the center of the joint body 1, and the above-mentioned communication portion of the horizontal hole 2 bulges out in an annular shape to form an annular passageway 4 for fluid.

Furthermore, a joint pipe 5 is inserted into the horizontal passage hole 2 from the right side in the first drawing, and the left end side is closed at the axis of the joint pipe 5, and the right end is open to provide a fluid outlet. An inner hole 6 forming a side passage is bored, and the inner hole 6
A plurality of communication passages 7 (in the figure, two locations in the diametrical direction) that open into the annular passage 4 are opened in the peripheral wall at the far end of the annular passage 4 .

In addition, on the left side of the joint 5 in FIG.
A medium-diameter first journal portion 5a and a small-diameter lid shaft 5
b is molded, and the first journal portion 5a
is supported by the flange 1a of the body 1 via a bearing 8, and the lid shaft 5b has a diametrical engagement groove recessed in its tip surface.
A lid 9 is fitted into the body flange 1a and surrounds the lid shaft 5b, and a bolt 1 at both ends is inserted into the engagement groove.
1, the lid 9 is coupled into one body via a clamp 10 that is fastened to the end surface of the lid 9.

Next, on the right side of the joint 5 in FIG.
A second journal part 5c having approximately the same diameter as the central part of the joint pipe 5 and a large diameter collar 5d are formed, and the second journal part 5c is connected to the collar 1b of the body 1 via a bearing 12. It is supported by a bearing, and the flange 5d is fitted inside the body flange 1b.

The sliding surfaces between the body flange 1a and the lid 9 and the sliding surfaces between the body flange 1b and the joint flange 5d are sealed by O-rings 13A and 13B, respectively.

By the way, a pair of symmetrical sealing members are arranged at a distance in the axial direction on the left half of the inner circumferential surface of the body side passage hole 2, which is deeper than the annular passage 4, and on the right half, which is on the opening side from the annular passage 4. They are opened and inserted in parallel. Hereinafter, the formation mode of the right side seal member will be described with reference to FIG.

First, the primary seal member 1 to which the fluid pressure P is directly applied is
4 consists of a ring body in which inner and outer double layers are integrally formed, that is, the seal ring 15 forming the inner layer is
The elastic ring 16 forming the outer layer is made of a synthetic resin material with excellent wear resistance and strength.
It is made of a material with high elasticity such as rubber, and it compresses the seal ring 15 in the centripetal direction.
It plays a role of absorbing fluctuations in fluid pressure P applied to 5.

Next, the secondary seal member 17, which is located on the outside air side together with the O-rings 13A and 13B, consists of three parts arranged in parallel in the axial direction, namely, an O-ring 18 and a pair of back-up springs 19 that sandwich the O-ring 18. It is formed by a back-up spring 19
serves to reinforce the strength of the O-ring 18.

Finally, in the base part 1c at the open end of the downward hole 3,
One pipe 20 of the transportation piping is joined,
Further, the other pipe 21 is joined to the mouthpiece 5e at the opening end of the horizontal passage hole 6.

Note that the pipe 21 attached to the joint in this manner can freely rotate with respect to the joint because the joint pipe 5 is smoothly fitted into the inner hole of the body 1.

Therefore, in the seal device of the embodiment configured as described above, (a) sudden fluctuations in the fluid pressure P are primarily buffered by the seal ring 15 and then applied to the O-ring 18; No excessive load is applied to the O-ring 18.

(b) Foreign matter such as scale and sludge should be removed from seal ring 1.
5 and does not enter the sealing surface, damage to each member of the seal is prevented. The seal ring 15 is made of a synthetic resin material with excellent wear resistance and strength, and has improved wear resistance when rotating in contact with the joint pipe 5, and furthermore, the seal ring 15 is made of a synthetic resin material with excellent wear resistance and strength. This prevents the elastic material from protruding from the parts and improves durability. This point is far superior to conventional rubber elastic bodies in which they directly contact rotating parts.

(c) Since the O-ring 18 is reinforced, its seal strength is sufficiently large.

(d) As mentioned above, wear and deterioration of each part will not be accelerated unnecessarily.

Due to the following reasons, this device has stable sealing performance and
Good properties can be obtained in terms of both durability.

As described above, the swivel joint sealing device according to the present invention is made of a wear-resistant synthetic resin material that absorbs fluctuations in fluid pressure P and prevents foreign matter such as scale and sludge from entering the fluid. The primary seal member 14 is formed by the elastic pressure of a band-shaped seal ring 15 having a rectangular cross-sectional shape, and the secondary seal member 17 is formed by an O-ring 18 reinforced by a back-up spring 19. The sealing surface of the secondary sealing member 17 is protected by the buffer function of the primary sealing member 14, which is made of a different material, thereby extending its service life and improving its sealing performance.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a swivel joint sealing device showing an embodiment of the present invention, FIG. 2 is a front view of the same, and FIG. 3 is an enlarged view of the portion shown in FIG. 1. P...Fluid pressure, 14...Primary seal member, 15
... Seal ring, 16 ... Elastic ring, 17 ... Secondary seal member, 18 ... O ring, 19 ... Backup spring.

Claims (1)

[Scope of utility model registration request] In a sealing device for sealing pressurized fluid passing through a swivel joint from the outside air, it is fitted at a point where fluid pressure is applied directly, and is made of a wear-resistant synthetic resin material and has a rectangular cross-sectional shape. A primary seal member formed of a band-shaped seal ring and an elastic ring with a rectangular cross section made of a different material from the seal ring that compresses and biases the seal ring in a centripetal direction, and a part that comes into contact with the outside air. is fitted in, and
A swivel joint sealing device characterized by being provided with a secondary seal member formed by an O-ring and a pair of back-up springs arranged side by side on both sides of the O-ring in the axial direction. .