JPS6141036Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to the invention of a flexible expandable pipe joint, which allows the passage of solid objects smoothly, and also allows the passage of rigid or sharp objects such as pieces of metal, glass pieces, or crushed stones. A flexible pipe joint that does not get damaged, has sufficient flexibility and bendability, ensures the expansion and contraction action, and can be easily and compactly manufactured using a relatively small amount of materials. This is what we are trying to provide.

Joints are indispensable in configuring pipes, and providing flexibility in such joints allows for the construction of bent pipes with rigid pipe materials, or the construction of connected pipes. It is important to change the direction of the pipe as appropriate, and at the same time, allowing expansion and contraction in such a pipe gives flexibility in design and also allows the pipe to expand and contract due to temperature changes, ground movements, etc. This is an important requirement in the above, and damage to pipes is often caused by not being able to properly obtain such elasticity. Therefore, various types of flexible pipe joints have been proposed in the past, but most of these conventional flexible pipe joints are made of rubber or similar synthetic resin materials (hereinafter simply referred to as rubber materials). Even if it is mainly used, it has the disadvantage that sufficient flexibility and bendability as well as appropriate stretchability cannot be obtained. Since this type of flexible expansion pipe joint is built into a steel pipe or other strong conduit, it is necessary to use a reinforcement material such as a metal material or woven fabric for the main material, rubber. However, in the conventional flexible telescopic pipe joints as described above, it is desirable to integrate the main material (rubber material) and the reinforcing material to achieve a preferable reinforcing effect. In other words, since the rubber material and the reinforcing material are integrated by adhering them, even if it were possible to achieve the desired integration and reinforcement, such With such a structure, the partial expansion and contraction of the rubber material in the part bonded to the reinforcing material is completely restrained during its flexible action, and the partial expansion and contraction of the rubber material in the circumferential direction during flexibility and the pipe expansion and contraction when the pipe is expanded and contracted are completely restricted. In any case, partial expansion and contraction in the entire circumference of the body is required only in the parts of the rubber material that are not bonded to the reinforcing material, and especially in the narrow rubber material parts separated between the reinforcement materials. Since the flexibility effect can only be obtained only when the rubber material is flexed, the force exerted on the rubber material during specific flexing must be large. Even if a flexible telescopic pipe joint is used, sufficient flexibility cannot be expected. In addition, in such conventional products, as mentioned above, the desired flexibility is achieved by partially expanding and contracting the narrow parts of the rubber material that are not bonded to the reinforcing material. It is necessary to increase the thickness considerably, and a flexible expansion pipe joint with a large wall thickness naturally requires a large amount of materials, and it is difficult to bond it with the reinforcing material arranged on it. Coupled with the complexity of the man-hours required to make it perfect, its production is extremely difficult and requires a large number of man-hours. In addition, in such conventional products, it is inevitable that the main material, the rubber material, is exposed on the inner surface, and the rubber material exposed on the inner surface has a large frictional resistance. It is difficult to ensure smooth flow of passing objects,
In particular, since this flexible telescoping pipe joint is located at a bend in the pipe, it exhibits a significant resistance against objects in transport pipes that utilize wind power or running water, and can cause blockages and stagnation. The portion where this occurs is concentrated exclusively in this flexible pipe joint portion. Moreover, when such passing objects contain rigid objects such as metal pieces, glass pieces, or crushed stones, especially sharp rigid substances, it is extremely likely that such passing objects will cause damage or lacerations. From this point of view, sufficient durability cannot be expected, and replacement must be extremely frequent, such as in waste transportation pipelines where there is a high possibility of contamination with the above substances. I don't get it. Furthermore, in conventional products, it is generally not easy to smoothly obtain both flexibility and elasticity.

The present invention was devised after repeated research to eliminate the disadvantages of the conventional flexible pipe joints as described above. That is, one of the basic embodiments of the present invention is as shown in FIG. 1, preferably a plurality of intervening ring bodies 1 as shown in the figure, and a series of these ring bodies 10, 1...
...10 is provided with a flexible covering telescopic tube 2 made of rubber material (or synthetic resin material). However, both the intervening ring body 1 and the end ring body 10 as described above are made of a rigid body such as steel, but each of the one end and one end of the intervening ring body 1 is made of a rigid material such as steel. A normal diameter portion 4b of a constant length is formed in each end ring 10, and the diameter of the normal diameter portion 4b is expanded to a degree corresponding to the thickness of the intervening ring 1 or the end ring 10. An inclined portion 4a of 30° or less (approximately 10°) is formed in the inclined portion 4a, and the inner diameter thereof is coaxial (straight tubular shape) with respect to the normal diameter portion 4b through the inclined portion 4a, and the inner diameter thereof is the outer diameter of the normal diameter portion 4b. A slightly larger enlarged diameter portion 4 is integrally formed, and the normal diameter portion 4b at the inner end of the other end ring 10 or the other end of the intervening ring 1 connected to the enlarged diameter portion 4 is They are slidable, have a slight gap, and are inserted and fitted with a certain margin left. Furthermore, both ends of the covered telescopic tube 2 are each bonded 3 to the outer circumferential surface of the end ring 10, but in order to stabilize the bond 3, these portions are appropriately woven. Cloth or other reinforcing material 5 is interposed, and there is no adhesive relationship between the covered telescopic tube 2 and each intervening ring body 1 as described above, that is, there is no free bonding This is the joint surface 6. In order to stabilize the adhesion and fixation of the covering telescopic tube 2 to the end ring 10 as described above, a locking ring 7 or the like is fixed to the outer periphery of the end ring 10 as the case may be.

FIG. 2 shows a form suitable for employing the present invention as described above in a conduit having a considerable internal pressure. That is, the assembly relationship of the end ring body 10, the intervening ring body 1, and the cover telescopic tube 2 is approximately the same as in the case of Fig. 1 described above, but in the case of this Fig. 2, as will be described later. The outer surface of the covered telescoping tube 2 is finished as a substantially flat surface by a method that is suitable for use as a flat surface, and boss-shaped protrusions 8 are integrally formed on both ends and in the center. An outer annular body 9 is provided, and the enlarged diameter portion 4 of the interposed annular body 1 is located in a portion of the outer annular body 9. This outer ring body 9,9
Preferably, the ring body is divided into two parts or more, with a part cut vertically along a line along the axial direction, and the split ring body is connected to a tightening member disposed at the cut part. They are tightly connected and integrated by a means, and are tightly joined to the outer circumferential surface of the covering telescopic tube 2. However, this outer ring 9
It is certain that there is a free joint 11 between the inner circumferential surface of the cover and the outer circumferential surface of the covered telescopic cylinder 2, as in the above-mentioned joint surface 6.

That is, in the case shown in FIG. 2, when a considerable amount of internal pressure acts on the inside of the pipe, the internal pressure is transferred from each gap between the normal diameter part 4b and the enlarged diameter part 4 of each intervening ring body 1 to the covering telescopic tube 2. The outer annular body 9 can almost accurately prevent expansion of the covered telescopic tube 2, which does not have any reinforcing material, even if the outer ring 9 acts on the inner surface of the outer ring.

FIG. 3 shows the above-mentioned interposed ring body 1 and covering telescopic tube 2.
The relationship is shown in a partially enlarged manner, and at the same time, a method for flattening the outer circumferential surface of the covered telescopic cylinder 2 is disclosed. That is, as a method of configuring such an assembly relationship by providing a free joint surface 6, the end ring body 1
It is sufficient to wrap an unvulcanized rubber material around the outer circumferential surface of the ring group 10, 1...10 assembled as shown in Fig. 2 using adhesive only for the 0 part, and then vulcanize it. Yes, in this way, the ring group 10,1
. . . 10 is used as a mold member for molding the covered telescopic cylinder 2, and the product according to the present invention as described above can be easily and precisely obtained. However, in order to wind the unvulcanized rubber material as described above, the unvulcanized rubber material is generally prepared as a belt-like body having a certain thickness and width, and this is wound. If this belt-like uncured rubber material is simply wound, the outer surface of the covering telescopic tube 2 will be formed to follow the enlarged diameter portion 4 of the interposed ring body 1, and will be finished with unevenness, as shown in FIG. That is, as shown in FIG. 1, an uneven outer circumferential surface does not necessarily provide a desirable appearance, and in particular, it is difficult to obtain a stable attachment relationship when fixing the outer ring 9 as shown in FIG. Therefore, in such a case, first prepare the unvulcanized rubber material with a cross-sectional shape corresponding to the portion of the interposed ring body 1 whose diameter is not expanded, as shown in the center portion of FIG.
After applying such an unvulcanized rubber material 12 to the boundary portion of each ring body, the unvulcanized rubber material of a predetermined width and thickness is wrapped around the entire area, thereby creating a substantially flat outer periphery after vulcanization. You can accurately obtain the surface.

FIG. 4 shows another embodiment in which the unvulcanized rubber material 12 described above is further modified. That is, in the one shown in FIG. 4, an annular body 13 made of metal or a hard material equivalent to metal is interposed at the end of the enlarged diameter portion 4 of the intervening ring body 1. , the unvulcanized rubber material 12 as described above is applied to the remainder. The ring body 13 may have a rectangular cross section, but preferably has a circular cross section as shown. That is, when the ring body 13 interposed in this way is finished by applying the unvulcanized rubber material 12 to the outer surface of the inclined portion 4a, the unvulcanized rubber material is placed between the enlarged diameter portion 4b and the normal diameter portion 4b. prevent entry into the gap 14 of the
Since the gap 14 is accurately secured, it facilitates the sliding action between the intervening ring bodies 1 when the joint according to the present invention expands, contracts, and bends.

According to the present invention as explained above, the intervening return body 1 and the end ring body 10 are made of steel on the inside.
are positioned in a continuous state of polymerization, so by setting the enlarged diameter part 4 as the upstream side, the frictional resistance is at least the same as that of a simple steel pipe, etc., even though it is mainly made of rubber material etc. In addition, since the covered telescopic tube 2 is effectively covered by the intervening ring 1 and does not form any steps in the flow direction, objects such as glass fragments, metal fragments, and crushed stones cannot pass through. However, regarding its flexibility, its normal diameter can be maintained between the intervening ring bodies 1 which form a coaxial enlarged diameter part 4 through the inclined part. Since the inner diameter of the enlarged diameter portion 4 is slightly larger than the outer diameter of the portion 4b, an effective sliding action in the tube axis direction and an expansion/contraction action of the covering telescopic cylinder 2 can be obtained, especially when the intervening ring body 1 and the covering are The above-mentioned free joint surface 6 exists between the telescopic tube 2, and the substantial connection between each intervening ring body 1 and the covering telescopic tube 2 is the enlarged diameter portion 4 having a straight shape. Since the diameter expansion at the inclined portion is as small as the thickness of the ring body 1 or 10, both the sliding action and the expansion/contraction action described above are virtually unrestricted, and the expansion/contraction of the covered telescopic cylinder is The entire length in the axial direction can be sufficiently obtained as a single unit, and the expanded diameter portion 4 can be sufficiently expanded and contracted.
The gap 14 between the normal diameter portion 4b and the normal diameter portion 4b provides a smooth and sufficient flexibility. Moreover, even with such flexible expansion and contraction, the coaxial enlarged diameter portion 4 is substantially joined to the other proximal end portion of the intervening ring body 1, maintaining a substantially dense tissue state and preventing the intrusion of foreign matter. to prevent Furthermore, as a result of the expansion and contraction effect being achieved integrally by making full use of the entire axial length of the covering telescoping tube 2, the flexible tube is not required to have excessively thick layers, reducing the required materials and Therefore, the flexibility and stretchability described above can be effectively obtained. In the end, we have successfully solved the disadvantages of the conventional ones as described above, and obtained a flexible pipe joint that is simple and advantageous, has excellent flexibility and durability, and is preferable for use, so it is effective in practical use. This is a great idea.

[Brief explanation of the drawing]

The drawings show embodiments of the invention,
Fig. 1 is a sectional view showing one embodiment of the present invention in a slightly bent state, Fig. 2 is a partially cutaway side view showing another embodiment thereof, and Fig. 3 is an enlarged sectional view of a part thereof. FIG. 4 is a sectional view similar to FIG. 3 showing a modification thereof. However, in these drawings, 1 is an intervening ring, and 2 is an intervening ring.
1 is a covered telescopic cylinder, 3 is an adhesive part, 4 is an enlarged diameter part, 4a is an inclined part, 4b is a normal diameter part, 6 is a free joint surface, 8 is a protrusion, 9 is an outer ring body, 11 is an end ring body , 14 indicate a gap.

Claims (1)

[Claims for Utility Model Registration] (1) End ring bodies 10 made of rigid bodies located on both end sides and at least one intervening ring body disposed between these end ring bodies 10 that is also made of a rigid body. 1 and these end rings 10 and a flexible covering telescopic tube 2 provided outside the intervening ring 1, the intervening ring 1 and one end ring 10
A normal diameter portion 4b of a certain length is formed in each of the normal diameter portions 4b, and the diameter of the normal diameter portion 4b is expanded to a degree corresponding to the thickness of the intervening ring body 1 or the end ring body 10.
An inclined part 4a of 30 degrees or less is continuously formed, and an enlarged diameter part 4 is formed coaxially with the normal diameter part 4b and whose inner diameter is slightly larger than the outer diameter of the normal diameter part 4b via the inclined part 4a. , the normal diameter portions 4b of each intervening ring body 1 and the other end ring body 10 can be slid into these enlarged diameter portions 4 of the same diameter, and are inserted and fitted with a slight gap and a certain margin. The covered telescopic cylinder 2 and each end ring body 10 are brought together.
10 are bonded together (3), and each of the above-mentioned intervening rings (1) and the covered telescopic tube (2) are freely joined (6). (2) Protrusions 8 are formed at both ends and in the middle of the outer periphery of the covered extensible cylinder 2, and an outer ring body 9 made of a rigid body is provided in a loosely joined state between these protrusions 8, and the outer ring body 9. The flexible telescoping pipe joint according to claim 1, wherein the enlarged diameter portions 4 of the intervening ring bodies are located inside each of the intervening rings.