JPH022155Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a pipe joint, more specifically, a spherical shape on the inner circumferential surface of the pipe joint body so that the pipe body inserted into the pipe joint body can swing freely. The present invention relates to a pipe joint formed with a recess.

(Prior Art) Conventionally, as a prior art most similar to the present invention in this type of pipe joint in which a spherical recess is formed on the inner circumferential surface of the pipe joint main body, the patent application filed in 1983 by the applicant has already been proposed. There is an idea related to No. 155388.

That is, this invention was developed in order to eliminate the need for the ball-shaped joint that was previously used in this type of pipe joint, and as shown in FIG. The housing 2 is installed in the pipe joint 6c to fit into the housing 2 between the pair of stop springs 1c and 1d.
It has a structure in which a retractable seal body 4c is interposed in a retractable seal body 5c.For example, as shown in the same figure, one end side is fitted onto a joint pipe 15c, and the other end side is used by being screwed into a pipe body. It is something.

(Problems to be Solved by the Invention) However, since the above-mentioned pipe joint has a structure in which the elastic seal body 4c is interposed between the pair of stop rings 1c and 1d, escape force may occur in the pipe body A, for example. The joint body 6c is connected to the joint pipe 15.
When the stop ring 1c moves outward with respect to c, one stop ring 1c is locked to the lock ring 18 fitted onto the joint pipe 15c, as shown in FIG. 7B.
A force is generated to move the seal body 4c toward the seal body 4c, and the seal body 4c is therefore pressed by the one stop ring 1c and expands and contracts coaxially with the tube body, and the one stop ring 1c moves toward the seal body 4c. As a result, a gap 21 is created between the stop ring 1c and the spherical recess 8c as shown in FIG.
Fluid enters the housing 25c in which the seal body 4c is housed through the gap 21, and the fluid eventually enters the seal body 4c, the inner circumferential surface of the spherical recess 8c, and the outer circumferential surface of the joint tube 15c. In addition, the intrusion of the above-mentioned fluid may reduce the elasticity and elasticity of the seal body.
This fundamentally impairs the functionality necessary for the seal, resulting in a fatal problem in that the water-stopping properties of the pipe joint as a whole are impaired.

In order to solve these problems, the present invention was developed as an improvement to the above-mentioned pipe joint in which a seal body is interposed between the stop rings, and a gap is created between the stop ring and the spherical recess of the joint body. The purpose is to prevent this and maintain the water-stopping effect within the joint body.

(Means for Solving the Problems) The means of the present invention for solving the above-mentioned problems is such that, in a pipe joint in which a seal body is interposed between stop rings as described above, A tip made of an inflexible material is attached so that the seal body does not expand or contract coaxially with the tube body.

(Function) In other words, by installing the above-mentioned tip inside the seal body, the seal body is constructed so that it does not expand or contract coaxially with the tube body, so one stop ring tends to move toward the seal body due to the escape force of the tube body, etc. However, the stop ring does not move at all within the joint body because it is blocked by the seal body that does not expand or contract coaxially with the pipe body, and therefore a gap may be created between the ring body and the spherical recess of the joint body. That is never the case. Furthermore, although the seal body does not expand and contract in the direction of the tube axis, it expands and contracts in the direction perpendicular to the tube axis, and is thus securely pressed against the inner circumferential surface of the joint body and the outer circumferential surface of the inserted tube. .

(Example) Hereinafter, embodiments of the present invention will be described according to an example shown in the drawings.

FIG. 1A is a front view of a stop ring used in a pipe joint as an example, and FIG.
a is composed of two halves 22, 22 made of metal such as stainless steel, the outer circumferential surface 2 of which is formed into a substantially arcuate shape constituting a part of a spherical surface, and the inner circumferential surface 3 is formed in a face-like shape. In addition, in the pipe joint of this embodiment, another stop ring 1b is used in addition to the above stop ring 1a.
Since its configuration is the same as the one stop ring 1a described above, its explanation will be omitted.

Figure 2 A shows the two stop springs 1a, 1.
B is a side view of an O-ring as a sealing body that can be installed between A metal tip 5 is installed inside the O-ring 4 parallel to the tube axis so as not to expand or contract in the tube axis direction. The chips 5 are provided at eight equiangularly spaced locations on the O-ring 4, as shown in FIG. 2A.

In FIG. 3, reference numeral 6 denotes a metal joint body made of a substantially cylindrical integrally molded body, and a spherical recess 8 is formed on the inner peripheral surface in front of one end 7. Locking portions 9a, 9b are formed on the inner peripheral edges of both ends, and inner peripheral surfaces 10a, 10b on both sides of the locking portions 9a, 9b are tapered outward. Reference numeral 11 indicates a threaded portion formed on the inner peripheral surface of the joint body 6 on the other end 12 side.

When the stop rings 1a, 1b and the O-ring 4 are installed in the joint body 6 having such a structure, first one of the stop rings 1a is installed.
The half bodies 22, 22 constituting the two halves 22, 22 are fitted into the recess 8 of the joint body 6 in order to be combined into a ring shape, and then a thin plate made of synthetic resin is attached to the stop ring 1a that has been combined by the two halves 22, 22. The O-ring 4 is fitted into the recess 8 through the ring 13, and then the other stop ring 1b is separated from the one stop ring 1a in order to combine the halves 22, 22 in the same way as the one stop ring 1a. In the opposite direction, the O-ring 4 is fitted into the recess through the thin plate ring 13. In this state, the pair of stop rings 1a, 1b are connected to the locking portions 9a, 9b.
Since it is locked in place, it does not slip out of the joint body 6. Further, in this case, since the O-ring 4 is expandable and contractible in the vertical direction, that is, in the direction perpendicular to the tube axis direction, the O-ring 4 is pressed against the inner circumferential surface of the joint tube 15 and the joint body 6. Become.

Next, an example of how to use the pipe joint 14 configured in this way will be explained. First, as shown in FIG.
Both ends of the joint pipe 15 are inserted into the respective pipe joints 14, 14, and a bellows-shaped extensible cover body 16 is externally fitted between the pipe joints 14, 14. Note that the other stop ring 1 is attached to the joint pipe 15.
Stoppers 17, 17 that can be locked on the stop ring 1b are provided to protrude outward, and a metal lock ring 1 that can be locked on the one stop ring 1a.
8 and 18 are fitted externally.

After the joint pipe 15 and the telescopic cover 16 are installed as described above, both pipe joints 14, 14 are attached.
The ends of the tubes A, B are screwed into the threaded portions 11, 11 of the joint bodies 6, 6, respectively, to connect the tubes A, B.

Next, the pipe joint 1 is fitted onto the joint pipe 15 in this manner and connects both pipe bodies A and B.
To explain the actions of 4 and 14, tube bodies A and B
A relief force is generated in the joint body 6 and the joint pipe 15
When moving in the direction of arrow A in Fig. 4, the fifth
As shown in FIG.
The movement of the joint tube 15 is prevented. In this case, one stop ring 1a
is pressed by the lock ring 18, so it tries to move to the side opposite to the moving direction of the joint body 6, that is, to the O-ring 4 side, but the O-ring interposed between the one stop ring 1a and the other stop ring 1b 4, since the tip 5 is installed inside and never expands or contracts in the tube axis direction, one stop ring 1a never moves toward the O-ring 4 and is completely prevented from moving within the joint body 6. That's what happens. Therefore, the stop ring 1a
There is never a gap between the pipe fitting body 6 and the concave portion 8 of the fitting body 6 as in the conventional case, and since no fluid enters into the housing 25, the water-stopping properties of the pipe fitting are never impaired. It is. Also, although the O-ring 4 does not expand and contract in the tube axis direction, it expands and contracts in the direction perpendicular to the tube axis.
The inner circumferential surface of the joint body 6 and the outer circumferential surface of the joint tube 15 are pressed against each other, and water-stopping properties can be further improved.

Furthermore, when the joint main body 6 moves in the opposite direction and the stopper 17 is locked to the other stop ring 1b, the other stop ring 1b is held in place by the O-ring 4 having the chip mounted therein. It never moves to the O-ring side. Therefore, the other stop ring 1b
There is also no gap between the recessed portion 8 of the joint body 1 and the recessed portion 8 of the joint body 1.

In this way, when the pipe bodies A and B connected by the pipe joints 14 and 14 expand and contract, the water-tightness within the joint body 6 is achieved by using the O-ring 4 that does not expand and contract in the pipe axis direction as described above. Both stop springs 1
By interposing it between a and 1b, a remarkable improvement was achieved.

In addition, the pipe joints 14, 14 can absorb the expansion and contraction of both the pipe bodies A, B as described above, and also can absorb the expansion and contraction of the ring body 1.
Since the joint tube 15 swings as shown in FIG. 5B due to the spherical contact between a and 1b and the recess 8 of the joint body 6, it is possible to absorb the mutual eccentricity of both tubes A and B. .

Incidentally, the type of seal body interposed between the stop rings 1a and 1b is by no means limited to the O-ring 4 as in the above embodiment, and may be a sealing packing having a cross section other than circular, for example.

Further, the material of the chip 5 installed inside the seal body is not limited to metal as in the embodiment, but may be made of, for example, hard synthetic resin. The point is that the tip 5 made of a non-flexible material is housed within the seal body so that the seal body does not expand or contract in the tube axis direction.

Furthermore, in this embodiment, the half body 2 is simply divided into two parts.
2 and 22 constitute the stop rings 1a and 1b. For example, as shown in FIG. The half bodies 22, 22 may be integrated to form the stop rings 1a, 1b, or the half bodies 22, 22 may be integrated by threading the bolt 23 and the screw hole 24 as shown in FIG. may be converted into

Further, the stop rings 1a and 1b are not necessarily limited to those in which the half bodies 22 and 22 are integrated as in the above embodiment, but may be in the shape of an integrally formed partially cut-out ring. .

Furthermore, in this embodiment, the stop springs 1a, 1b
A thin plate ring 13 is interposed between the O-ring 4 and the O-ring 4, but this thin plate ring 13 does not necessarily need to be interposed.

Further, in this embodiment, the two joint bodies 6, 6 are connected by the elastic cover body 16, but the connecting means is by no means limited to this, and for example, the two joint bodies 6, 6 are screwed together. In addition, it is possible to connect the two joint bodies 6, 6 without connecting them.
It may be formed integrally.

Therefore, the usage example of the pipe joints 14, 14 is by no means limited to the usage example described above, and can be changed depending on the usage.

All other design changes may be made within the scope of the present invention.

(Effects) As mentioned above, the present invention has a seal body interposed between a pair of stop rings fitted in a spherical recess of a joint body, which is mounted inside a tip made of an inflexible material. Therefore, even if the stop ring tries to move toward the seal body due to relief force of the tube, the seal body will not expand or contract in the tube axis direction. Its movement is completely prevented, and therefore there is no gap between the stop ring and the spherical recess of the joint body, as in the conventional case. There is no intrusion of fluid, and therefore the water-stopping properties are significantly better than in the past, and the water-stopping effect can be made almost perfect, which is a particularly remarkable effect.

In addition, although the seal body does not expand or contract in the direction of the tube axis, it expands or contracts in the direction perpendicular to the tube axis, so this seal body is pressed against the inner circumferential surface of the joint body and the outer circumferential surface of the tube body to be inserted. , together with the stop ring, have a synergistic effect on the water-stopping property.

[Brief explanation of the drawing]

FIG. 1 shows a stop ring as an embodiment, in which A is a front view and B is a side view as seen from direction C in A. Figure 2 shows O as an example of the seal body.
The ring is shown, A is a front view, and B is a sectional view taken along the line D-D of A. FIG. 3 is a longitudinal cross-sectional view of the pipe joint. FIG. 4 is a partially cutaway sectional view showing an example of how the joint is used. Figure 5 is a cross-sectional view showing the action of the pipe joint, with A being in an expanded/contracted state and B being in an eccentric state. FIG. 6A is a front view of a stop ring of another embodiment, and FIG. 6B is a partially cutaway front view of the stop ring of another embodiment. Figures 7A and 7B are partial cross-sectional views of a conventional pipe joint. 1a, 1b...stop ring, 4...O ring, 5...chip, 6...joint body, 8...recess, 14...pipe joint.

Claims (1)

[Claims for Utility Model Registration] 1. A spherical recess 8 is formed on the inner circumferential surface of the joint body 6 so that the tube inserted into the joint body 6 can swing freely, and a spherical recess 8 is formed in the recess 8. In a pipe joint in which a pair of stop rings 1a, 1b are fitted and an expandable seal body is interposed between the pair of stop rings 1a, 1b, a tip 5 made of a non-flexible material is contained in the seal body. A pipe joint characterized in that the seal body does not expand or contract coaxially with the pipe body when installed. 2. The pipe joint according to claim 1, which is a utility model registration, in which the stop springs 1a and 1b are made of two halves. 3. The pipe joint according to claim 1 or 2, wherein the sealing body is an O-ring 4. 4. The pipe joint according to claim 1, wherein the tip 5 is made of metal.