JPH10231973A - Pipe detachment prevention fitting for union nut joint - Google Patents

Abstract

(57) [Summary] [Object] To reduce the number of constituent members of a pipe detachment prevention bracket, to reduce the number of manufacturing steps, and to provide a tool such as a wrench or a pipe wrench that does not interfere with an arm. The union nut and the arm are integrated to form a tube separation prevention fitting comprising two members, an integrated member and a split ring, and one end of the arm connected to the union nut is connected to the union nut. The other end side is connected in a free state by a hook provided on one of the arm tip and the outer peripheral surface of the split ring, and an engaging portion provided on the other, so that the joint tube is prevented from coming off. .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system in which an end of a joint pipe not provided with a screw is inserted into a socket of a pipe or a joint body, and is fastened with a union nut through rubber packing. The present invention relates to a fitting for preventing a pipe from being detached from a pipe joint.

[0002]

2. Description of the Related Art In addition to its simple and inexpensive point, such a pipe end screwless pipe joint has a flexible joint portion, and therefore absorbs vibration, elongation, distortion, etc. of the pipe well. Nominal diameter is 13-50 because of having protection function
mm and a normal pressure of at most 5 kg
/ Cm ² has been favorably used for the joining method of low pressure pipes.

[0003] However, in the conventional pipe joint, the holding force of the rubber packing against the connection pipe is determined according to the tightening force of the union nut at the time of joining work. there were.
Also, if rust-preventive oil or oil from thread cutting is attached on the pipe, the holding force of the bonded pipe is extremely reduced, and it is extremely difficult to prevent the pipe from coming off. Met. Therefore, conventionally, in a state where the joint pipe and the pipe joint main body can be flexibly expanded and contracted, a pipe detachment prevention fitting for preventing the pipe from deviating is developed and is attached to the pipe joint part.

[0004] However, the conventional pipe detachment-preventing metal fittings cannot exhibit sufficient elasticity and flexibility, and there is a contradictory problem that if one function is secured, the other function is sacrificed. Was. In addition, when trying to secure expansion and contraction flexibility, the overall length of the joint becomes longer, the disadvantage that it cannot be used in a narrow area, and the number of bolt fastening operations increases,
There were drawbacks, such as very troublesome work. Furthermore, with conventional pipe detachment prevention fittings, it is necessary to perform temporary assembly at the factory shipment stage, disassemble it at the site, and reassemble it so that it will not be lost because it is necessary to assemble each part as a set. It was a tedious task.

The applicant of the present invention has disclosed a Japanese Patent Application No. Hei 6-111 shown in FIG.
No. 647 has already been filed. According to the prior application, the pipe detachment prevention fitting 1 of this embodiment includes a split ring 2 serving as a retaining ring, which is cut off in the middle of the circumference, and a bolt for fastening the split ring 2 to the outer peripheral surface of the joint pipe 3. 4 and a nut 5, a circular locking ring 6, and two arms 7, 7 for connecting the split ring 2 and the locking ring 6.

As is apparent from FIG. 3B, the split ring 2 has a C-shape in which a part of the circumference is cut out.
The outer fitting is attached to the joining tube 3. On the other hand, the circular locking ring 6 has an insertion hole 10 whose size is larger than the outer diameter of the joint body 8 and smaller than the outer diameter of the union nut 9. The split ring 2 and the locking ring 6 are connected by two upper and lower arms 7, 7, and the space between the other split ring 2 and the locking ring 6 is for inserting a tool or the like. It is a free space 11 in which can be operated. On the inner peripheral surface of the split ring 2, an uneven portion for preventing slippage is formed.

The inner diameter between the arms 7, 7 is set larger than the maximum outer diameter of the tool mounting portion of the union nut 9.

[0008] Thus, the arm 7,
Reference numeral 7 indicates that the connection with the split ring 2 is performed in a loose state, and the connection with the locking ring 6 is integrally connected and fixed. That is, hooks 13, 13 projecting in the inner diameter direction are formed at the distal ends of the arms 7, 7 on the split ring 2 side.
15, 16 are formed and these flanges 14, 15,
A recess 17 is formed between the sixteen. The flange 14 is formed on the end face of the split ring 2 near the union nut 9 in the circumferential direction.
Numeral 6 is provided continuously from the annular flange 14 in a direction parallel to the axis. The hooks 13, 13 of the arms 7, 7 are loosely fitted into the recesses 17 of the split ring 2.

The pipe detachment prevention fitting 1 according to the prior application is:
When shipping from the factory, the split ring 2, the locking ring 6, the arms 7, 7, the packing 12, the union nut 9, and the joint body 8 may be assembled into one set. After being assembled in a set state, these parts do not fall apart. At the time of construction, the pipe end of the joining pipe 3 is inserted from the split ring 2 side as shown by a chain line in FIG. Then, the pipe end of the joining pipe 3 passes through the union nut 9 and the packing 12 mounted on the union nut 9 and is positioned inside the joint body 8. Next, the union nut 9 is tightened with a tool, and finally, the bolt 4 and the nut 5 of the split ring 2 are fastened to fix the split ring 2 at a predetermined position on the outer peripheral surface of the joining pipe 3.

[0010] As described above, the management-prevention-prevention metal fitting 1 according to the prior application of the present applicant can be assembled in a factory and shipped in a temporarily tightened set state, and can be constructed on site without being disassembled into pieces. Possible and convenient. Moreover, when a force in the departure direction acts on the joint pipe 3, the arms 7,
7 is engaged with the end face of the union nut 9, and the other end is connected to the hooks 13, 13 by the flanges 14, 1 of the split ring 2.
4, so that the joining tube 3 does not come off.

[0011]

However, in the technique previously filed by the present applicant, the problem arises when the joint pipe 3 is a hard pipe such as a hard vinyl chloride pipe or a steel pipe. However, when the joining tube 3 is a soft tube such as a soft polyethylene tube or the like and has a small diameter of 30 mm or less, there are the following disadvantages. That is, the union nut 9 must be fastened by inserting a wrench, a pipe wrench, or the like between the arms 7, 7, while the arms 7, 7 cover the outer peripheral surface of the union nut 9. In addition, since the gap between the arms 7 and 7 is extremely narrow due to the small diameter pipe, there is a problem that the tool such as the spanner or the pipe wrench interferes with the arms 7 and 7 and the fastening operation cannot be performed smoothly. .

In the prior art, there are three types of manufacturing operations, namely, an operation of integrally manufacturing the arms 7, 7 and the locking ring 6, an operation of manufacturing the union nut 9, and an operation of manufacturing the split ring 2. However, the cost is high and the improvement for simplification has been called for, since the casting is performed by troublesome casting.

[0013]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention is a further improvement of the technique previously filed by the present applicant. A pipe detachment prevention fitting consisting of an integrated member and a split ring, which reduces the number of manufacturing steps and prevents this kind of pipe detachment without tools such as spanners and pipe wrenches from interfering with the arm. No metal fittings will be provided.

[0014] In order to solve the above-mentioned problems, a means according to claim 1 employed in the present invention is to insert a threadless joint pipe into a pipe or a joint body having a socket having an external thread formed on an outer peripheral surface thereof,
In a pipe joint having a structure in which an annular rubber packing is inserted and inserted and a union nut is screwed and fastened to the receiving portion, a part of the circumference is cut out, and the union nut is externally fitted to the joining pipe on the rear end side with respect to the union nut. A split ring mounted and tightened by bolts and nuts, and an arm connecting the split ring and the union nut, one end of the arm is integrally connected to the union nut, and the other end is an arm. The hook provided on one of the tip and the outer peripheral surface of the split ring and the engaging portion provided on the other are connected in a mating state, and by attaching the bolt and nut to the split ring, the split ring is A pipe detachment prevention fitting for a union nut joint, wherein the fitting is prevented from coming off.

The means of claim 2 adopted by the present invention is:
One set of arms is formed on the outer surface of the union nut on the opposite surface, and the separation of the joint tube is prevented by engaging the hooks provided on the distal ends of both arms with the rear end surface of the split ring. , The upper dimension between both arms is
It is set to be larger than the maximum dimension of the fastening part of the split ring, smaller than the outer diameter of the split ring, smaller than the dimension when the bolt and nut are assembled, and the lower dimension between both arms is 2. The pipe for preventing union nut joint according to claim 1, wherein the outer diameter of the pipe is set larger than the outer diameter of the pipe.

Further, according to a third aspect of the present invention, a pair of arms are formed on the outer peripheral surface of the union nut on opposing surfaces. This is achieved by the engagement between the recess provided and the hook protruding from the outer peripheral surface of the split ring engaging with the recess, and the upper dimension between both arms is larger than the maximum dimension of the fastening portion of the split ring. Also, the outer diameter of the hooks provided on the outer peripheral surface of the split ring is set to be smaller than the dimension when the bolt and the nut are assembled, and the lower dimension between the recesses of the both arms is set to be smaller. 2. The method according to claim 1, wherein the outer diameters of the hooks provided on the outer peripheral surface of the ring are set to be larger than the outer diameter of the hooks.
4. A pipe detachment prevention fitting for a union nut joint according to item 1.

[0017]

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. FIG. 1 shows a pipe detachment prevention bracket 18 for a union nut joint according to a first embodiment of the present invention, wherein FIG. 1A is a semi-longitudinal sectional view, and FIG. is there. As shown in FIG.
And the arm 20 are integrally formed by casting.

The arm 20 is formed as a pair of two with the outer peripheral surface extended at a position facing the outer peripheral surface of the union nut 19, and a hook 2 projecting in the inner diameter direction is provided at the tip end side.
1 is provided. The inner peripheral surface side of the hook 21 is set so as to be smaller than the outer diameter E of the split ring 2 and larger than the outer diameter of the joint pipe 3 so that the hook 21 can be engaged with the end face of the split ring 2. ing. Arms 20, 20
The upper dimension B between the bolts 2a,
It is set so as to be larger than the maximum dimension A between 2a, smaller than the outer diameter E of the split ring 2, and smaller than the dimension F when the bolt 4 and the nut 5 are assembled. It is set as follows. On the other hand, the lower dimension G between the arms 20, 20 is set to be larger than the outer diameter E of the split ring 3. That is, G>E>B>
A and F> B.

Further, a dimension D from the rear end surface of the union nut 19 of the arms 20, 20 to the inner peripheral surface side of the hooks 21, 21 is set larger than the width dimension C of the split ring 2. The dimensional difference DC between the two is the amount of flexible expansion and contraction of the pipe joint. Other configurations of the joint body 8, the split ring 2, and the packing 12 are the same as those in the conventional case.

As described above, the conventional locking ring 6 shown in FIG. 3 can be omitted by integrally casting the arms 20, 20 with the union nut 19.
In addition, since the manufacture can be performed simultaneously with the manufacture of the union nut 19, one casting operation can be omitted.

Pipe detachment prevention fitting 1 made of such components
8 is cast-molded at a factory, temporarily assembled, and shipped in this state. Temporary assembly first, arm 20,
A union nut 19 integrally formed with the arm 20 is prepared. The split ring 2 is directed upward from below in FIG. Charge. This charge
It is guaranteed by the dimensional relationship of B> A. And
After charging, the bolt 4 is inserted between the fastening portions 2a of the split ring 2.
And temporarily tighten the nut 5. As a result, even if the hands are released from the split ring 2, the bolts 4
Catch between 20 and split ring 2 union nut 1
It will not drop out of 9.

Next, the packing 12 is inserted into the inner peripheral surface side of the union nut 19, and these are entirely screwed to the joint body 8. That is, the union nut 19 is screwed onto a screw portion formed on the outer peripheral surface of the joint body 8. In addition, packing 1
The charging of the split ring 2 may be performed before the split ring 2 is charged into the union nut 19, or either of them may be used. Thereby, the temporary fastening of the pipe separation preventing bracket 18 is completed,
It is shipped in this state from the factory.

Then, at the construction site, the joining pipe 3 is inserted into the pipe detachment preventing bracket 18 in the temporarily tightened state. The insertion is performed by inserting the insertion port on the distal end side of the joining pipe 3 into the split ring 2, the union nut 19, and the packing 12 to reach the inside of the joint body 8. Thereafter, after confirming that the union nut 19 has been tightened to the minimum tightening torque required for water tightness with a wrench or a pipe wrench, a position where the fastening portion of the split ring 2 is easily tightened (the fastening portion is After turning this with tightening so as to come to a certain position), retighten. Finally, the split ring 2 is fastened. The split ring 2 is fastened by positioning in the axial direction with respect to the joining pipe 3 and the direction of the bolt fastening portions 2a, 2a (FIGS. 1A and 1B).
Is positioned as shown above), the bolt 4 and the nut 5 are fully tightened, and the cutout teeth on the inner peripheral surface of the split ring 2 are cut into the outer peripheral surface of the joining pipe 3 to prevent slipping. What is necessary is just to carry out. Thereby, the joining pipe 3
As shown in FIG. 1A, within the range of dimension DC,
It is possible to expand and contract it.

FIG. 2 shows a pipe detachment prevention fitting 22 for a union nut joint according to a second embodiment of the present invention. FIG. 2A is a semi-longitudinal sectional view, and FIG. It is a front view. The pipe detachment prevention fitting 22 has a pair of hooks 23 formed on the outer peripheral surface of the split ring 2 facing each other, and is formed between the rear end face of the union nut 19 of the arms 20, 20 and the hooks 21, 21. A concave portion 24 is formed between itself and the peripheral surface. The relationship between the axial dimension J of the recess 24 and the width dimension K of the hook 23 is J> K, and JK is the amount of flexible expansion and contraction of the joint tube 3. The arms 20, 2
The upper dimension B between 0 is the fastening portion 2a of the split ring 2.
It is set larger than the maximum dimension A between them, smaller than the outer diameter dimension H of the hooks 23 provided on the outer peripheral surface of the split ring 2, and smaller than the dimension F when the bolts 4 and the nuts 5 are assembled. The lower dimension I between the concave portions 24 of the arms 20 is set larger than the outer diameter H of the hooks 23 provided on the outer peripheral surface of the split ring 2. That is, there is a dimensional relationship of I>H>B> A and a dimensional relationship of F> B. The other configuration and operation and effect are the same as those of the first embodiment.

[0025]

As described above, in the present invention,
A split ring that is cut off in the middle of the circumference and that is externally fitted to the joining pipe on the rear end side of the union nut and tightened by bolts and the like, and an arm that connects the split ring and the union nut. One end of the arm is integrally connected to a union nut, and the other end of the arm is in a mating state by a hook provided on one of the tip of the arm and the outer peripheral surface of the split ring and an engaging portion provided on the other. As a result, the conventional locking ring can be omitted, the casting operation can be simplified, and a cost-effective inexpensive metal fitting can be provided.

The arm is an extension of the outer peripheral surface of the union nut, and the entire portion of the union nut that engages with the tool is exposed. There is no such thing as
Smooth fastening work is possible.

Further, the minimum dimension between both arms is
Since the split ring is set to be larger than the maximum size of the joint of the split ring with bolts and nuts, the split ring is inserted between the arms of the union nut and the split ring is temporarily tightened with bolts and nuts. It does not fall off the union nut. Therefore, it is possible to ship a set of pipe detachment prevention fittings from a factory as a tentatively assembled set, and to carry out the construction without disassembling it as it is, which is also excellent in construction efficiency.

[Brief description of the drawings]

FIG. 1 shows a pipe detachment prevention fitting according to a first embodiment of the present invention, in which FIG. 1 (A) is a partial longitudinal sectional view and FIG. 1 (B) is a front view thereof.

FIG. 2 shows a pipe detachment prevention fitting according to a second embodiment of the present invention. FIG. 2 (A) is a partial longitudinal sectional view and FIG. 2 (B) is a front view thereof.

3A and 3B show a conventional pipe detachment prevention fitting, in which FIG. 3A is a semi-longitudinal sectional view, and FIG. 3B is a front view showing a state after fastening.

[Explanation of symbols]

2 ... Split ring, 2a ... Split ring fastening part, 3 ... Joint pipe, 4 ... Bolt, 5 ... Nut, 8 ... Joint body, 12 ... Packing, 18 ... Pipe detachment prevention fitting, 19 ... Union nut, 20 ... Arm , 21 ... hook, 22 ... pipe detachment prevention fitting, 23 ... hook, 24 ... recess

Claims (3)

[Claims] An unthreaded joining pipe is inserted into a pipe or a joint body having a receiving portion having an external thread engraved on an outer peripheral surface thereof, an annular rubber packing is inserted and interposed, and a union nut is connected to the receiving portion. A split ring which is cut off in the middle of the circumference of the pipe joint and is externally fitted to the joining pipe on the rear end side of the union nut and tightened by bolts and nuts; And an arm connecting the union nut, one end of the arm is integrally connected to the union nut, and the other end is provided on one of the arm tip and the outer peripheral surface of the split ring. The union nut joint is characterized in that it is connected in a loose state by an engaging portion provided on the other side, and the split ring does not come off by assembling a bolt and a nut to the split ring. Use tube separation prevention bracket. A pair of arms are formed on the outer peripheral surface of the union nut on opposing surfaces, and the separation of the joint pipe is prevented by a hook provided on the distal end side of both arms and a rear end surface of the split ring. The upper dimension between both arms is set to be larger than the maximum dimension of the fastening portion of the split ring, smaller than the outer diameter of the split ring, and smaller than the dimension when the bolt and nut are assembled. The pipe fitting for preventing union nut joint according to claim 1, wherein a lower dimension between both arms is set larger than an outer diameter of the split ring. 3. A pair of arms are formed on the outer peripheral surface of the union nut on opposing surfaces, and a joint tube is prevented from being detached by a recess provided in the middle of both arms and a split engaging with the recess. The upper dimension between both arms is larger than the maximum size of the fastening part of the split ring, and the hooks provided on the outer peripheral face of the split ring are made by engagement with hooks protruding from the outer circumference of the ring. Is smaller than the dimension of the bolt and nut when assembled, and the lower dimension between the recesses of both arms is the outer diameter of the hooks provided on the outer peripheral surface of the split ring. The pipe for preventing union nut joint from being detached according to claim 1, wherein the metal pipe is set to be larger than the dimension.