JP2917133B2 - Temporary fastening structure of telescopic flexible pipe joint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint having elasticity and flexibility, which protects the components having the largest outer diameter and places the components on the same axis. The present invention relates to a temporary tightening structure of a telescopic flexible pipe joint that can be aligned and provided at a low cost.

[0002]

2. Description of the Related Art As such a pipe joint having excellent elasticity and flexibility, a pipe joint shown in a partial longitudinal sectional view of FIG. 9 is known. In this prior art, the inner diameter of the tapered receiving portion 3 is set to be larger than the outer diameter of the joining tube 1, and the central portion in the axial direction swells like a drum to form a joint body 2 having a wide cavity 4 formed therein. Is prepared, and the insertion port 5 of the joint pipe 1 is inserted into the reception port 3. A rubber packing 6 for sealing is provided between the outer peripheral surface of the mouth portion of the joint body 2 and the receiving portion 3 of the joint body 2.
And pushed into the joint body 2 from behind by the pressing wheel 7. This pushing is performed by inserting a tightening bolt 11 into a bolt hole 10 of a protrusion 8 formed on the outer periphery of the end face of the joint body 2 and a bolt hole 9 of a pressing ring 7 corresponding to the bolt hole 10 and tightening the nut 12 with a nut 12. By doing so.

[0003] As a result, the outer wedge surface and the inner wedge surface of the rubber packing 6 are pressed between the tapered socket portion 3 of the joint body 2 and the outer peripheral surface of the joint tube 1, and the joint tube 1 and the joint tube 1 are joined together. The body 2 is held concentrically and seals fluid leakage from the connection site. In this state, the joining pipe 1
Can freely move without interfering with the inner wall of the joint body 2 in the cavity 4 of the joint body 2, can be bent with respect to the axis of the joint body 2, and can be flexible. It has nature.

The joint body 2, the rubber packing 6, and the pressing ring 7 are shipped from the factory in a state where they are temporarily tightened by tightening bolts 11 and nuts 12 in order to prevent loss on the way. I have. If the pipe joint in such a temporarily tightened state can be constructed without disassembling,
Its workability is extremely convenient. For this purpose, the pipe 1 in the temporarily tightened state is connected to the pipe 1 from the outside as it is.
It is necessary to be able to insert. In order to satisfy such requirements, it is necessary that the inner diameter of the rubber packing 6 of the pipe joint in a temporarily tightened state is larger than the outer dimension of the joint pipe 1. This is because if the inner diameter of the rubber packing 6 is smaller than the outer dimension of the joining tube 1, the later insertion of the joining tube 1 is hindered by the rubber packing 6 and cannot be performed.

However, conventionally, even if the inner diameter of the rubber packing 6 is set to be larger than the outer diameter of the joint pipe 1, the inner diameter of the rubber packing 6 becomes larger than the outer diameter of the joint pipe 1 immediately before construction. Sometimes it was getting smaller. That is, in the state of the temporary tightening, there is nothing to fix the movement of the push ring 7, so that, for example, the push ring 7 is lowered and the entire pipe joint is shipped from the factory until it is constructed on site. In some cases, such as when placed, the push ring 7 moves forward in a direction to press and urge the rubber packing 6.

Therefore, by the forward movement of the pressing wheel 7,
The rubber packing 6 was pressed, and the diameter of the rubber packing 6 was reduced by the action of the tapered receptacle 3. In other words, the state is the same as when the rubber packing 6 is fully tightened,
Due to the diameter reduction operation, the inner diameter of the rubber packing 6 is reduced to the joint pipe 1.
Was smaller than the external dimensions. Therefore, in the related art, the tightening bolt 1 of the pipe joint shipped in a temporarily tightened state is conventionally used.
The rubber packing 6 is taken out by removing the nut 1 and the nut 12 at the construction site and disassembling the whole once, and the diameter of the rubber packing 6 is corrected so as to become the original inner diameter. After that, the troublesome work of reassembling and installing the pipe joint was performed.

In view of such a problem, the present applicant has already developed a temporary fastening structure as shown in FIG. This temporary tightening structure causes a remarkable change in volume when pressurized by a certain force or more, and causes the tube joint to contract temporarily using styrene foam 13 which is difficult to deform unless a certain force is applied. ing. The Styrofoam 13 is disposed between the protrusion 8 of the joint body 2 and the pressing wheel 7 and serves as a spacer. Therefore, in a normal state in which a force equal to or more than a certain level does not act, an interval corresponding to the thickness of the Styrofoam 13 can be secured between the pressing wheel 7 and the protrusion 8 of the joint body 2. Therefore, the pressing ring 7 does not press and urge the rubber packing 6, and the inner diameter of the rubber packing 6 does not become smaller than the outer shape of the joint pipe 1. Therefore, it is possible to insert the distal end of the joining pipe 1 from the outside into the cavity 4 of the joint body 2 by inserting the tip of the joining ring 1 and the rubber packing 6 from the outside in the state of the temporary fastening.

[0008]

However, in the temporary fastening structure using the styrofoam 13,
The projecting portion 8 of the joint main body 2 where the outer diameter dimension is the largest
And the outer peripheral surface of the press wheel 7 are always exposed. Therefore, the outer peripheral surface may come into contact with the truck bed or other members between the time of shipment from the factory and the time of actual construction at the site, and the paint on the part may be peeled off. was there. When the paint is peeled off, electrical corrosion or corrosion due to rust or the like proceeds from that portion, and the life is shortened, which is not preferable.

In this temporary fastening structure, the joint body 2, the rubber packing 6, and the pressing ring 7 are in a state where they can move freely within a certain range. Are not aligned in the same axial center line, and the rubber packing 6 depends on the degree of insertion of the joint pipe 1.
In addition, there is a problem that the axis center of the joint body 2 must be finely adjusted.

Further, the styrofoam 13 needs to be molded with a dedicated mold, but if it is molded with a mold, there is a problem that the manufacturing cost increases and the cost of the entire joint structure itself increases. there were.

[0011]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned problems and has been improved and eliminated. The present invention is capable of protecting a portion of a pipe joint component having the largest outer diameter, and furthermore, it is possible to protect these components. Can be aligned on the same axis,
An object of the present invention is to provide a temporary joint structure of a pipe joint which is easy to form.

[0012] In order to solve the above-mentioned problems, the present invention employs a means for inserting a threadless joint pipe into a pipe or a joint body having a tapered socket, and forming an annular pipe. In a telescopic flexible pipe joint in which a rubber packing is inserted and interposed and tightened to a pipe or a joint body by bolts and nuts as tightening means of the press ring, between the protrusion of the pipe or the joint body and the press ring, Two ribs projecting in the inner diameter direction at positions separated by a predetermined distance to secure a predetermined interference,
A temporary tightening ring made of synthetic resin comprising a projecting portion of the pipe or the joint body and an annular body joined to the outer peripheral surface of the press ring is interposed, and the temporary tightening ring, the press ring, the rubber packing, the pipe or the joint body are used. And a temporary fastening structure of the telescopic flexible pipe joint, wherein

The means of claim 2 adopted by the present invention is as follows.
The two ribs of the temporary tightening ring are composed of a row in which ribs having a long circumferential length are arranged in an annular shape and a row in which ribs having a short circumferential length are arranged in an annular shape. 2. The temporary tightening structure for a telescopic flexible pipe joint according to claim 1, wherein the individual short annular ribs are arranged so as to be displaced in the circumferential direction so as not to overlap each other when viewed from the insertion direction of the pipe. It is.

Further, the means of claim 3 adopted by the present invention is that the annular body of the temporary tightening ring has a diameter between a portion joined to the projecting portion of the pipe or the joint body and a portion joined to the outer peripheral surface of the pressing ring. 3. The temporary tightening structure for a telescopic flexible pipe joint according to claim 1 or 2, wherein the part is different in a part or the entire circumference and has a step.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below with reference to an embodiment shown in the drawings. The same reference numerals as those in the conventional case denote the same members.

FIGS. 1 and 2 relate to a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view showing a state in which a joint pipe 1 is inserted into a pipe joint in a temporarily tightened state. 2A is a front view showing the temporary tightening ring 14, and FIG. 2B is a plan view showing a part of the temporary tightening ring 14.

As shown in FIG. 1, the temporary fastening ring 14 is widely used as a resin material, and is formed of a resin material such as hard vinyl chloride or soft polyethylene, whose raw material can be obtained at low cost. Thus, the temporary tightening ring 14 has an annular body 15 that is joined to the outer peripheral surface 8a of the projection 8 of the joint body 2 and the outer peripheral surface 7a of the pressing ring 7. In addition, temporary tightening ring 1
Reference numeral 4 denotes two types of ribs 17 and ribs 18 which protrude in the inner diameter direction of the annular body 15 and are annularly arranged.
The rib 17 is formed to have a circumferential length shorter than that of the rib 18. A predetermined interval is provided between the annular row of the ribs 17 and the annular row of the ribs 18 so that a predetermined interference can be secured. It is provided separately.

That is, the interval between the annular row of the short ribs 17 and the annular row of the long ribs 18 is determined by the tightening bolt 11 and the nut 12 with the joint body 2, the pressing ring 7 and the rubber in the temporary tightening state shown in FIG. The dimensions are set so that the pressing ring 7 does not cause the rubber packing 6 to move forward when the three members are fastened to the packing 6. As a result, it is possible to sufficiently secure a tightening allowance for final tightening performed at the time of subsequent construction. Therefore, in this temporarily tightened state,
The rubber packing 6 does not perform the diameter-reducing operation along the tapered receiving portion 3. Therefore, rubber packing 6
Has remained larger than the outer shape of the joined tube 1.

Furthermore, the short ribs 17 and the long ribs 18 are formed by the short ribs 17 and the long ribs 18 when viewed from the tube insertion direction, as is apparent from FIGS. 2A and 2B.
Are arranged in the circumferential direction so as not to overlap with each other.
Therefore, for example, the injection molding mold made of synthetic resin can be constituted only by a mold that can be divided into right and left, and since a core is not required, the construction of the molding apparatus is simplified, and the process from the start of molding to the removal of the mold and cleaning is included. Also, the molding operation itself becomes easy. Further, a V-shaped notch 19 is formed in the front and rear surfaces of the annular body 15 of the temporary tightening ring 14, as shown in FIG. 2B. In the notch 19, the joint body 2 and the press ring 7 are cast products, and the outer diameter of the joint body 2 and the pressing ring 7 vary slightly. Therefore, the outer diameter of the temporary tightening ring 14 is slightly expanded or contracted to cope with the variation. It is something that has been dealt with. The notch 19 is not always necessary and can be omitted.

In this embodiment, the tightening bolt 11 has an enlarged diameter portion 11a and a flange portion 11b, and the flange portion 11b is connected to the snap ring 20 fixed to the outer peripheral surface of the joint pipe 1. This is a type of pipe joint that can be engaged to prevent the joint pipe 1 from coming off.
In the case of this embodiment, the joint body 2 is formed on the receiving surface side different from the insertion side of the joint pipe 1 and is substantially the same as the conventional one shown in FIGS. 9 and 10. It is.

In this embodiment, a pipe joint is shipped from a factory in a temporarily tightened state shown in FIG. At this time, the outer peripheral surface 7a of the pressing ring 7, which is the portion having the largest outer diameter dimension among the pipe joint constituent members.
The outer peripheral surface 8a of the protruding portion 8 of the joint body 2 is covered with a flat annular body 15 of the temporary tightening ring 14, so that peeling of the paint due to contact with the floor surface or other members can be prevented. It is possible.

At the construction site of the pipe joint, as shown in FIG. 2, it is only necessary to insert the pipe end on the insertion side of the joint pipe 1 from the outside of the pipe joint in a temporarily tightened state. This is, as mentioned above,
By the portion of the flat annular body 15 of the temporary tightening ring 14,
Outer peripheral surface 7a of press ring 7 and outer peripheral surface 8 of projection 8 of joint body 2
a are aligned within the same joint plane, and as a result, the axial lines of the three members of the pressing ring 7, the joint body 2, and the rubber packing 6 fitted inside the socket 3 of the joint body 2 are aligned. This is because they are the same. In addition, the rib 17 of the temporary tightening ring 14
And 18, it is ensured that a predetermined interference is formed between the pressing wheel 7 and the protruding portion 8 of the joint body 2, whereby the diameter reduction operation of the rubber packing 6 is prevented and the inner diameter thereof is joined. This is also because it is larger than the outer shape of the tube 1. As described above, since it is not necessary to remove the tightening bolts 11 and the nuts 12 in the temporarily tightened state when the pipe joint is installed, these small members are not lost, and the installation work is efficient.

Thereafter, as shown in FIG. 1, the tightening bolt 11 and the nut 12 are fastened while the temporary tightening ring 14 is mounted. By this fastening, the temporary tightening ring 14
A certain force or more acts on the ribs 17 and 18 arranged in an annular shape. Therefore, the short ribs 17 having low strength are each pressed by the front end face of the pressing wheel 7 and are broken, and are fitted between the long ribs 18 having high strength as the pressing wheel 7 moves forward. That is, tightening bolt 1
By fastening the nut 1 and the nut 12, the distance between the pressing wheel 7 and the protruding portion 8 of the joint body 2 is reduced, and the end face comes into contact when the screw is maximally tightened. By reducing the distance between the two, the distance between the short ribs 17 and the long ribs 18 arranged in an annular shape is also reduced. By forming the short ribs 17 shorter, the strength of the short ribs 17 can be set to be lower than the strength of the long ribs 18, and the short ribs 17 are broken. Becomes narrower. Then, in the state of being maximally tightened, the short rib 1 broken between the long ribs 18 is used.
7 can be fitted, and the interval between the pressing wheel 7 and the protruding portion 8 of the joint body 2 can be set to the thickness of one rib 17 or 18 to form a uniform interval over the entire peripheral surface. Is possible.

The rubber packing 6 is moved in accordance with the advance of the pressing wheel 7.
Moves forward, and the rubber packing 6 performs a diameter-reducing operation by an action with the tapered receiving portion 3 of the joint body 2. Then, it presses and adheres to the outer peripheral surface of the joined pipe 1 to perform an original sealing action. During this construction, the annular body 15 of the temporary tightening ring 14 includes the pressing ring 7 and the joint body 2.
It works to prevent earth and sand, stones, and the like from entering the space between the protrusions 8. Also, after the construction, the pressing wheel 7 and the projection 8
The screw portion of the tightening bolt 11 is prevented from coming into contact with the soil, and the screw portion of the tightening bolt 11 does not corrode electrically, chemically, or the like.

As shown in FIG. 2A, the short rib 17 having a low strength and the long rib 18 having a high strength are arranged such that the long rib 18 is located at a corner portion. Is good. This is because the corner portion can secure the rib strength more than the straight portion.

FIGS. 3 and 4 are front views of temporary fastening rings 21 and 22 according to the second and third embodiments of the present invention, respectively. In this embodiment, the press wheel 7 and the joint body 2
2 shows a case where the outer peripheral surface shape of the projection 8 is different from that shown in FIG.

FIGS. 5 and 6 relate to a fourth embodiment of the present invention. FIG. 5 is a longitudinal sectional view showing a state where the joint pipe 1 is inserted into a pipe joint in a temporarily tightened state. FIG. 6 is a front view showing the temporary tightening ring 23. In this embodiment, the outer peripheral surface 7 a of the pressing wheel 7 and the outer peripheral surface 8
a is different in diameter in a part of the circumferential direction, and has a step. Therefore, the temporary fastening ring 23
The annular body 15 has a similar step 2 at the step.
Four. Other configurations and basic operation and effects are the same as those of the above-described first embodiment.

FIGS. 7 and 8 relate to a fifth embodiment of the present invention. FIG. 7 is a longitudinal sectional view showing a state in which the joint pipe 1 is inserted into a pipe joint in a temporarily tightened state. 8 is a front view showing the temporary tightening ring 25. FIG. As shown in the figure, the temporary tightening ring 25 is a case where the step 24 of the temporary tightening ring 23 according to the fourth embodiment is further increased. The rib 18 is omitted. This is because in the portion where the step 24 is formed, the step 24 functions as the rib 18.
That is, the rib 17 and the step 24 of the temporary tightening ring 25 function to secure a predetermined tightening allowance between the pressing ring 7 and the protruding portion 8 of the joint body 2 so that the interval between them is not narrowed. Because you do. Except for the portion where the step 24 is not formed, the rib 1 is formed in the same manner as in the above-described embodiments.
The ribs 7 and the ribs 18 are arranged annularly. The other configuration, operation, and effect are the same as those of the first embodiment.

By the way, the present invention is not limited to the above-described embodiment, and can be appropriately changed. For example, the step 24 provided on the temporary fastening ring may be formed all around. In this case, the step 24 can also function as the rib 18, and the rib 18 can be omitted. In addition, the short rib 17 and the long rib 18 only need to be disposed in an annular shape, respectively.
It is not necessary to specify the front and rear positions. Furthermore, the joint main body 2 and the joint pipe 1 may be conventional ones shown in FIGS. 9 and 10, or may be other pipe joints.

[0030]

As described above, in the present invention,
Two ribs protruding in the inner diameter direction of the temporary tightening ring keep the distance between the protruding part of the pipe or the joint body and the pressing ring constant as long as a certain amount of force is not applied to the ring, and secure the tightening margin. It has a function as a spacer to perform the operation. Therefore, in the state of temporary tightening where no more than a certain force acts,
An interval between the ribs can be ensured between the pressing ring and the protruding portion of the joint main body, and the diameter of the rubber packing is not reduced. Therefore, it is possible to insert the distal end of the joint pipe from the outside into the cavity of the joint body by inserting the tip of the joint pipe into the pressing ring and rubber packing from the outside, and the pipe joint installation work becomes extremely simple, There is no loss of bolts and nuts. In addition, in this case, the temporary tightening ring has a flat annular body that functions to align the center axes of the pressing ring, the joint body, and the rubber packing in the same manner. It will be easier.

When the tightening bolts and nuts are fastened and the temporary tightening ring is pressed with a force of a certain level or more, the rib row having weak strength on one side is broken and fits between the other ribs. Therefore, even if the fastening is performed to the maximum, the interval between the pressing ring and the protruding portion of the joint body can be made uniform to the thickness of one rib over the entire circumference. That is, it is possible to make the fastening force uniform over the entire circumference.

Further, the annular portion of the temporary tightening ring covers and covers the outer peripheral surface of the push ring and the outer peripheral surface of the projecting portion of the joint body, which are the portions having the largest outer diameter in the joint portion. In addition, it is possible to prevent the paint from being peeled and removed due to the outer peripheral surface coming into contact with a floor surface or another member, and to maintain a function of preventing corrosion of the paint. Moreover, after the construction, no soil, stones, or the like are mixed between the protrusion of the joint body and the pressing ring, and there is no possibility of causing a fastening failure. In addition, since the screw portion of the tightening bolt between the projecting portion of the joint body and the pressing ring does not come into contact with the soil, it is possible to prevent corrosion of the portion.

Further, in the case where the two kinds of ribs of the temporary tightening ring are formed in an annular row of ribs having different lengths and are arranged so that they are alternately arranged, the forming die thereof can be divided into two. It can be composed only of molds and does not require complicated cores. Therefore, it is possible to reduce the cost required for manufacturing the mold, and it is also possible to easily perform material injection and demolding at the time of manufacturing, and to obtain excellent moldability.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a case where a joint pipe is inserted into a pipe joint in a temporarily tightened state according to a first embodiment of the present invention.

FIGS. 2A and 2B show a temporary tightening ring according to the first embodiment of the present invention, wherein FIG. 2A is a front view and FIG. 2B is a plan view showing a part thereof.

FIG. 3 is a front view of a temporary fastening ring according to a second embodiment of the present invention.

FIG. 4 is a front view of a temporary fastening ring according to a third embodiment of the present invention.

FIG. 5 is a longitudinal sectional view showing a case where a joint pipe is inserted into a pipe joint in a temporarily tightened state according to a fourth embodiment of the present invention.

FIG. 6 is a front view of a temporary fastening ring according to a fourth embodiment of the present invention.

FIG. 7 is a longitudinal sectional view showing a case where a joint pipe is inserted into a pipe joint in a temporarily tightened state according to a fifth embodiment of the present invention.

FIG. 8 is a front view of a temporary tightening ring according to a fifth embodiment of the present invention.

FIG. 9 is a partial longitudinal sectional view showing the entire conventional pipe joint.

FIG. 10 is a partial longitudinal sectional view showing the entirety of a pipe joint previously developed by the present applicant.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Joining pipe 2 ... Joint body 4 ... Air cavity 6 ... Rubber packing 7 ... Pressing ring 11 ... Tightening bolt 12 ... Nut 14 ... Temporary fastening ring 15 ... Annular body 17 ... Short rib 18 ... Long rib 21 ... Temporary fastening ring 22: Temporary fastening ring 23: Temporary fastening ring 24: Step 25: Temporary fastening ring

Claims (3)

(57) [Claims] An unscrewed joining pipe is inserted into a pipe or a joint body having a tapered receiving portion, and an annular rubber packing is inserted into the pipe or joint body, and the pipe or the pipe is tightened by bolts and nuts as tightening means for a pressing ring. In a telescopic flexible pipe joint that is tightened to a joint body, a projecting part that projects in the inner diameter direction at a position separated by a predetermined distance between the protrusion of the pipe or the joint body and the pressing ring to ensure a predetermined tightening margin. A temporary fastening ring made of a synthetic resin comprising two ribs and an annular body joined to the outer peripheral surface of the projecting portion of the pipe or the joint body and the pressing ring, and the temporary fastening ring, the pressing ring, and the rubber packing. A temporary tightening structure for a telescopic flexible pipe joint, wherein a pipe or a joint body is temporarily tightened integrally. 2. The two ribs of the temporary tightening ring are composed of a row in which ribs having a long circumferential length are arranged annularly and a row in which ribs having a short circumferential length are arranged annularly. 2. The telescopic flexible tube according to claim 1, wherein each of the long annular rib and the short annular rib is arranged so as to be displaced in the circumferential direction so as not to overlap each other when viewed from the insertion direction of the tube. Temporary fastening structure for joints. 3. The annular body of the temporary tightening ring has a step which is partially or entirely different in diameter from a portion joined to the projecting portion of the pipe or the joint main body and a portion joined to the outer peripheral surface of the pressing ring. The temporary tightening structure for a telescopic flexible pipe joint according to claim 1, wherein the temporary tightening structure is provided.