JP2019219029A - Joint and construction method of joint - Google Patents

Abstract

To provide a joint which can prevent the loosening of nuts by a simple structure, and a construction method of the joint.SOLUTION: A joint 100 comprises: a joint main body 40 which is fit to external peripheries of end parts of two pipes 11, 12, and connecting the two pipes 11, 12 to each other; bag nuts 21, 22 fit to the outside of the joint main body 40, and fastening and fixing the joint main body 40 to the pipes 11, 12; and loosening prevention pins 31 which are detachably attached to the bag nuts 21, 22. Cylindrical portions 41, 46 and screw crest portions 42, 47 located at a nut attachment side X rather than the cylindrical portions 41, 46, and screwed with the bag nuts 21, 22 are formed at an external periphery of the joint main body 40, and the loosening prevention pins 31 are arranged between the cylindrical portions 41, 46 of the joint main body 40 and the bag nuts 21, 22 in a state of being attached to the bag nuts 21, 22.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a joint for connecting pipes and a method for constructing the joint.

  As shown in FIG. 23, the general joint 600 includes a joint main body 104 for connecting the two pipes 101 and 102, and cap nuts 105 and 106 for tightening the joint main body 104 from outside. A seal member 103 is provided between the joint body 104 and the pipes 101 and 102. Here, in the conventional joint 600, the cap nuts 105 and 106 may be loosened due to vibration or the like while using the joint 600. Here, as shown on the right side of FIG. 23, when the cap nut 106 is loosened, a gap is formed between the pipe 102 and the seal member 103, and there is a possibility that water leakage may occur. For this reason, the check ring 107 is fitted around the outer periphery of the joint main body 104 so that the check ring 107 can be viewed when the cap nuts 105 and 106 are loosened.

  Further, in the joint described in Patent Literature 1, a pressure holding ring that fastens the joint body to the pipe is provided outside the joint body. Further, a holding ring is fitted between the pressing and holding ring and the pipe so that the pressing and holding ring is not loosened. Further, in order to prevent the rotation of the pressure holding ring, an annular insertion member is inserted into the pressure holding ring. A groove for inserting the insertion member is formed in the pressure holding ring.

Japanese Patent No. 6099800

  However, with the structure of the conventional joint 600 as shown in FIG. 23, loosening of the cap nuts 105 and 106 itself cannot be prevented in advance. Further, the joint disclosed in Patent Literature 1 has a problem that the structure for preventing the press-holding ring from being loosened is complicated, the number of parts is increased, and the manufacturing cost is increased.

  The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a joint and a method of installing the joint that can prevent loosening of a nut with a simple structure.

In order to solve the above-described problems, a joint according to the present invention has a joint body fitted to an outer periphery of an end of a pipe, and is fitted outside the joint body to tighten and fix the joint body to the pipe. A nut and a loosening prevention pin detachably attached to the nut are provided. On the outer periphery of the joint body, a cylindrical portion and a thread portion with which the nut is screwed are formed, and the thread portion is more nut than the cylindrical portion. The loosening prevention pin, located on the mounting side, is provided between the cylindrical portion of the joint body and the nut while being mounted on the nut.
Thus, when the nut is rotated in a direction to loosen the joint body, the loosening prevention pin abuts on the thread portion, and the nut cannot be further rotated.

Further, the pipe may have an expanded portion bulging radially outward, and a seal member may be used to seal between the joint body and the expanded portion of the pipe in a state where the loosening prevention pin is attached to the nut.
Further, the nut may have a pin engagement hole or a pin engagement groove for detachably holding the loosening prevention pin.
Furthermore, a convex portion may be formed between the cylindrical portion and the thread portion of the joint body.

  Further, in the method for manufacturing a joint according to the present invention, a joint body having a cylindrical portion and a thread portion located on the nut mounting side of the cylindrical portion is attached to an end of the pipe, and a nut is attached to the joint body. The loosening prevention pin is attached to the nut, and the loosening prevention pin is disposed between the cylindrical portion of the joint body and the nut.

  Still further, in the method for manufacturing a joint according to the present invention, the loosening prevention pin may be attached to the nut, and at least one end of the loosening prevention pin may be bent after the loosening prevention pin is arranged between the cylindrical portion of the joint body and the nut.

  ADVANTAGE OF THE INVENTION According to the joint and the installation method of the joint which concern on this invention, loosening of a nut can be prevented with a simple structure.

FIG. 2 is a cross-sectional view showing a shape of the joint according to Embodiment 1 of the present invention cut in an axial direction. It is a perspective view of the joint main body of the joint shown in FIG. 3A is a perspective view of the cap nut of the joint shown in FIG. 1, and FIG. 3B is a cross-sectional view showing a shape of the cap nut shown in FIG. It is. It is a perspective view of the loosening prevention pin of the joint shown in FIG. It is sectional drawing which shows the shape which cut | disconnected the joint shown in FIG. 1 along the cutting line VV. FIG. 2 is a partially enlarged view showing a connection point between a joint and a pipe shown in FIG. 1, and shows a state where a nut is tightened into a joint body. FIG. 2 is a partially enlarged view showing a connection portion between a joint and a pipe shown in FIG. 1, and shows a state where a nut is loosened with respect to a joint body. 8A is a perspective view showing a state in which one end of the loosening prevention pin shown in FIG. 6 is bent, and FIG. 8B is a diagram showing the state in which the loosening prevention pin is attached to the cap nut of the joint shown in FIG. It is a perspective view which shows the state which bent one end of the loosening prevention pin further. 9A and 9B are views showing another example of the cap nut of the joint shown in FIG. 1, FIG. 9A is a perspective view of the cap nut, and FIG. 9B is a diagram in which the cap nut shown in FIG. It is sectional drawing which shows the shape cut | disconnected perpendicularly to the direction. It is a perspective view which shows another example of the loosening prevention pin of the joint shown in FIG. It is a perspective view which shows the state which attached the loosening prevention pin shown in FIG. 10 to the joint. FIG. 11 is a cross-sectional view illustrating a state in which the loosening prevention pin illustrated in FIG. 10 is attached to a joint. It is a side view which shows another example of the loosening prevention pin of the joint shown in FIG. FIG. 14 is a perspective view showing a state where the loosening prevention pin shown in FIG. 13 is attached to a joint. FIG. 14 is a cross-sectional view showing a state where the loosening prevention pin shown in FIG. 13 is attached to a joint. It is a perspective view which shows another example of the loosening prevention pin of the joint shown in FIG. It is a perspective view which shows another example of the loosening prevention pin of the joint shown in FIG. It is a perspective view which shows another example of the loosening prevention pin of the joint shown in FIG. It is a side view which shows another example of the coupling main body of the coupling shown in FIG. FIG. 9 is a perspective view showing a state in which the joint according to Embodiment 2 of the present invention is attached to a valve. FIG. 21 is a perspective view showing a joint main body of the joint shown in FIG. 20. FIGS. 22A and 22B are perspective views showing another example of the joint main body of the joint shown in FIG. It is sectional drawing which shows the joint which concerns on a conventional example.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
Embodiment 1 FIG.
As shown in FIG. 1, the two pipes 11 and 12 are connected via a joint 100. Each of the pipes 11 and 12 is an expanded pipe having expanded portions 13 and 14 that expand outward in the radial direction. A fluid such as water flows inside the pipes 11 and 12. The pipes 11 and 12 are formed of stainless steel, iron or vinyl chloride resin.

The joint 100 has a joint body 40 that fits around the ends of the pipes 11 and 12 and connects the pipes 11 and 12. Further, cap nuts 21 and 22 are screwed into both ends of the joint body 40. By fitting the cap nuts 21 and 22 to the joint body 40 and tightening the cap nuts 21 and 22, the cap nuts 21 and 22 can be fixed to the pipes 11 and 12 by tightening the joint body 40. Rubber rings 51 and 52 are provided between the joint body 40 and the pipes 11 and 12, respectively. The rubber rings 51 and 52 constitute a sealing member. A loosening prevention pin 31 is detachably attached between the cap nuts 21 and 22 and the joint body 40.
1 shows a state in which the cap nut 21 is tightened into the joint body 40, and the right side of FIG. 1 shows a state in which the cap nut 22 is loosened with respect to the joint body 40.

As shown in FIG. 2, the joint main body 40 has a first connection portion 40a and a second connection portion 40b at both ends. Between the first connection part 40a and the second connection part 40b, there is provided a central protruding part 45 having a substantially hexagonal columnar outer shape. Thread portions 42 and 47 for screwing the cap nuts 21 and 22 are provided on the end sides of the first connection portion 40a and the second connection portion 40b, respectively. Further, cylindrical portions 41 and 46 having no unevenness are provided between the thread portions 42 and 47 and the central projecting portion 45. That is, the thread portions 42 and 47 are located on the end side of the cylindrical portions 41 and 46, that is, on the nut mounting side X. Note that the nut mounting side X refers to a side on which the cap nuts 21 and 22 are attached to and detached from the joint body 40. Also, as shown in FIG. 1, seal member holding grooves 43 and 48 for holding rubber rings 51 and 52 are formed on the inner peripheral surfaces of the first connection portion 40a and the second connection portion 40b of the joint body 40, respectively. Have been.
In addition, as shown in FIG. 1, the first connection part 40a of the joint main body 40 is fitted to the pipe 11, and the second connection part 40b is fitted to the pipe 12.

As shown in FIGS. 3A and 3B, a pair of pin engagement holes 23 are formed in the cap nut 21 that is screwed into the first connection portion 40 a of the joint body 40. On the inner peripheral surface of the cap nut 21, a female screw portion 25 that is screwed to the thread portion 42 of the first connection portion 40 a of the joint body 40 is formed.
The cap nut 22 screwed into the second connecting portion 40b of the joint body 40 has the same structure as the cap nut 21. That is, as shown in FIG. 1, a pair of pin engaging holes 24 and female screw portions 27 having the same structure as the pin engaging hole 23 and female screw portion 25 of the cap nut 21 are also formed in the cap nut 22. .

As shown in FIG. 4, the loosening prevention pin 31 is bent. The straight portion 31a at one end of the bent loosening prevention pin 31 is shorter than the straight portion 31b at the other end. The loosening prevention pin 31 is formed of a spring steel that can be bent appropriately. As shown in FIG. 5, the loosening prevention pin 31 is inserted into the pin engagement hole 23 of the cap nut 21 and is detachably held. Further, the loosening prevention pin 31 can be similarly inserted into the pin engagement hole 24 of the cap nut 22 and held detachably.
The material of the loosening prevention pin 31 may be a metal that can be bent using a jig or the like, and is not limited to spring steel. Further, the loosening prevention pin 31 may be formed of resin instead of metal.

A state in which the cap nut 21 is screwed into the first connection portion 40a of the joint body 40 and the loosening prevention pin 31 is inserted into the pin engagement hole 23 of the cap nut 21 will be described with reference to FIG. FIG. 6 is a partially enlarged view of the left side of FIG.
As shown in FIG. 6, when the cap nut 21 is tightened into the joint body 40, the rubber ring 51 is pressed between the seal member holding groove 43 of the joint body 40 and the expanded portion 13 of the pipe 11. Thereby, the space between the joint body 40 and the expanded portion 13 of the pipe 11 is sealed by the rubber ring 51. At this time, the loosening prevention pin 31 inserted in the pin engagement hole 23 of the cap nut 21 is disposed between the cylindrical portion 41 of the joint body 40 and the cap nut 21. Therefore, when the cap nut 21 is rotated in the loosening direction, the anti-loosening pin 31 comes into contact with the thread portion 42, and the cap nut 21 is no longer loosened.
When the cap nut 22 is screwed into the second connection portion 40b of the joint body 40 and the pin 31 for preventing the cap nut 22 is inserted into the pin engagement hole 24 of the cap nut 22, the effect of preventing the cap nut 22 from being loosened is similarly obtained. Obtainable.

FIG. 7 shows a state in which the loosening prevention pin 31 is removed from the pin engagement hole 24 of the cap nut 22 and the cap nut 22 is loosened with respect to the second connection portion 40 b of the joint body 40. FIG. 7 is a partially enlarged view of the right side of FIG.
As shown in FIG. 7, when the cap nut 22 is loosened, the rubber ring 52 held in the seal member holding groove 48 of the second connection portion 40 b of the joint body 40 is separated from the expanded portion 14 of the pipe 12, A gap is created between the ring 52 and the pipe 12.
Note that when the loosening prevention pin 31 is removed from the pin engagement hole 23 of the cap nut 21 and the cap nut 21 is loosened with respect to the first connection portion 40a of the joint body 40, the rubber ring 51 and the pipe 11 There is a gap between the two.

  As described above, in the joint 100 according to the first embodiment, the loosening prevention pin 31 is detachably attached to the cap nuts 21 and 22. The loosening prevention pin 31 is provided between the cylindrical portions 41, 46 of the joint body 40 and the cap nuts 21, 22 while being attached to the cap nuts 21, 22. Therefore, when the cap nuts 21 and 22 are rotated in the loosening direction, the loosening prevention pins 31 contact the thread portions 42 and 47, and the cap nuts 21 and 22 cannot be further rotated in the loosening direction. Therefore, in this joint 100, the loosening of the cap nuts 21 and 22 can be reliably prevented with a simple structure simply by inserting the loosening prevention pins 31 into the cap nuts 21 and 22, and the construction management becomes easy. .

  The pipes 11 and 12 are expanded pipes having expanded portions 13 and 14, respectively. Therefore, when the cap nuts 21 and 22 are tightened into the joint body 40, the rubber rings 51 and 52 are pressed between the expanded portions 13 and 14 of the pipes 11 and 12 and the joint body 40, and a high sealing effect is obtained. be able to. Also, in order to prevent the cap nuts 21 and 22 from being loosened by using the anti-loosening pins 31 in a state where the expanded portions 13 and 14 of the pipes 11 and 12 and the joint body 40 are sealed with the rubber rings 51 and 52, respectively. It is possible to prevent a gap from being formed between the pipes 11 and 12 and the rubber rings 51 and 52. Therefore, it is possible to more reliably prevent water leakage from the connection point between the pipes 11 and 12.

  In addition, pin engagement holes 23 and 24 for detachably holding the loosening prevention pin 31 are formed in the cap nuts 21 and 22, respectively. Thereby, the loosening prevention pin 31 is securely held on the cap nuts 21 and 22, and the cap nuts 21 and 22 can be more reliably prevented from loosening.

  As shown in FIGS. 8A and 8B, after inserting the anti-loosening pin 31 into the pin engaging holes 23 and 24 of the cap nuts 21 and 22, one end 31c of the anti-loosening pin 31 is bent. Is also good. Thereby, the loosening prevention pin 31 can be prevented from coming off from the cap nuts 21 and 22. Further, by bending one end 31c of the loosening prevention pin 31 after the completion of the installation of the joint 100, the operator can visually confirm the completion of the installation.

  In addition, a cap nut 221 as shown in FIGS. 9A and 9B may be used for the joint 100 instead of the cap nuts 21 and 22. The cap nut 221 is formed with a pair of pin engagement grooves 223 for detachably holding the loosening prevention pin 31. Accordingly, by engaging the anti-loosening pin 31 with the pin engaging groove 223, the anti-loosening pin 31 is securely held in the cap nut 221 similarly to the pin engaging holes 23 and 24 of the cap nuts 21 and 22. Can be.

  Further, instead of the loosening prevention pin 31 shown in FIG. 4, a loosening prevention pin 231 as shown in FIGS. 10 to 12 may be attached to the cap nuts 21 and 22 in the joint 100. As shown in FIG. 10, the loosening prevention pin 231 is bent in a substantially C shape, and the tips 231c and 231d of the straight portions 231a and 231b on both sides are bent so as to be inclined inward. As shown in FIGS. 11 and 12, by attaching the anti-loosening pin 231 to the cap nuts 21 and 22, the tips 231c and 231d of the anti-loosening pin 231 are engaged with the joint main body 40 to prevent the loosening preventing pin 231 from coming off. can do.

  Further, instead of the loosening prevention pin 31 shown in FIG. 4, a loosening prevention pin 331 as shown in FIGS. As shown in FIG. 13, a bent portion 331 a capable of engaging with the outer shapes of the cap nuts 21 and 22 is provided on the bent prevention pin 331. Thus, as shown in FIGS. 14 and 15, by attaching the loosening prevention pin 331 to the cap nuts 21 and 22, the bent portion 331a of the loosening prevention pin 331 engages with the cap nuts 21 and 22, and the loosening prevention pin 331 is formed. Can be prevented.

  Further, instead of the loosening prevention pin 31 shown in FIG. 4, loosening prevention pins 431 to 631 as shown in FIGS. 16 to 18 are provided in only one or both of the pair of pin engagement holes 23 formed in the cap nut 21. It may be inserted and attached. 16 to 18 show an example in which the loosening prevention pins 431 to 631 are attached to the cap nut 21. However, the same configuration is used when the loosening prevention pins 431 to 631 are attached to the cap nut 22. I do.

  As shown in FIG. 16, the loosening prevention pin 431 is a split pin having a linear shape, and an annular portion 431a is formed at an end. The annular portion 431 a of the loosening prevention pin 431 prevents the loosening prevention pin 431 from coming out of the pin engagement hole 23.

  As shown in FIG. 17, the loosening prevention pin 531 is provided with a bent portion 531a that can be engaged with the outer shape of the cap nut 21. By attaching the slack preventing pin 531 to the cap nut 21, the bent portion 531a of the slack preventing pin 531 is engaged with the cap nut 21 and the loose preventing pin 531 can be prevented from coming off.

  As shown in FIG. 18, the loosening prevention pin 631 is a spring pin having a slit 631a. Therefore, by inserting the loosening prevention pin 631 into the pin engagement hole 23 in a compressed state, an elastic force is exerted on the loosening prevention pin 631 mounted in the pin engagement hole 23 so as to spread outward. Thereby, the loosening prevention pin 631 is prevented from coming off from the pin engagement hole 23.

  Furthermore, a joint body 240 as shown in FIG. 19 may be used for the joint 100 instead of the joint body 40 shown in FIG. Annular convex portions 243 and 248 are provided between the thread portions 42 and 47 and the cylindrical portions 41 and 46 of the joint body 240. As a result, when the cap nuts 21 and 22 are rotated in a direction in which the cap nuts 21 and 22 are loosened, the loosening prevention pin 31 comes into contact with the protrusions 243 and 248. Therefore, loosening of the cap nuts 21 and 22 can be reliably prevented, and the positioning of the loosening prevention pin 31 between the convex portions 243 and 248 and the central projecting portion 45 can be performed more reliably.

  In this embodiment, the joint 100 connects the two pipes 11 and 12, but is not limited thereto. The joint according to the present invention is a branch-type joint that connects three or more pipes. There may be.

Embodiment 2 FIG.
20 to 22 show the configuration of a joint 400 according to Embodiment 2 of the present invention. The joint 100 according to the first embodiment is used to connect the two pipes 11 and 12 to each other, whereas the joint 400 according to the present embodiment is used to connect the pipe 11 to another member. Used. The same reference numerals as those in FIG. 1 denote the same or similar components, and a detailed description thereof will be omitted.

  As shown in FIG. 20, the pipe 11 is connected to a valve 5 which is another member via a joint 400. The joint 400 is provided with a joint body 440. The joint body 440 is connected to the valve 5 and fits around the end of the pipe 11. As shown in FIG. 21, the joint main body 440 has a male screw part 460 that can be screwed to the valve 5 on one side of the center protruding part 45.

  Further, the joint 400 may have a joint main body 540 shown in FIGS. On the inner peripheral side of the joint body 540, a female screw portion 542 that can be screwed to another member is formed.

  As described above, the joint 400 according to the second embodiment has the joint bodies 440 and 540 that can connect the pipe 11 to another member. Similarly to the joint main body 40 of the joint 100, the joint main bodies 440 and 540 are formed with a cylindrical portion 41 and a thread portion 42. Therefore, similarly to the joint 100, the loosening of the cap nut 21 with respect to the joint main bodies 440, 540 can be reliably prevented with a simple structure simply by inserting the loosening prevention pin 31 into the cap nut 21.

  In the first and second embodiments, the cap nuts 21, 22, 221 are used to tighten and fix the joint bodies 40, 240, 440, 540 to the pipes 11, 12, but are not limited thereto. Not done. That is, the nut fitted to the outside of the joint bodies 40, 240, 440, 540 may be a nut other than the cap nut.

Further, annular grooves may be formed in the cylindrical portions 41, 46 of the joint bodies 40, 240, 440, 540, and the loosening prevention pins 31 may be fitted and positioned in the grooves.
Further, the pipes 11 and 12 are not limited to expanded pipes, but may be straight pipes.

  100, 200 joints, 11, 12 piping, 21, 22, 221 cap nuts (nuts), 23, 24 pin engagement holes, 31, 231, 331, 431, 531, 631 loosening prevention pins, 40, 240, 440, 540 Joint body, 41, 46 cylindrical part, 42, 47 thread part, 223, 224 pin engagement groove, 243, 248 convex part, X nut mounting side.

Claims (6)

A joint body fitted to the outer periphery of the end of the pipe,
A nut that is fitted to the outside of the joint body and tightens and fixes the joint body to the pipe,
A loosening prevention pin detachably attached to the nut,
On the outer periphery of the joint body, a cylindrical portion and a thread portion with which the nut is screwed are formed,
The thread portion is located closer to the nut mounting than the cylindrical portion,
The joint, wherein the loosening prevention pin is provided between the cylindrical portion of the joint body and the nut while being attached to the nut. The pipe has an expanded portion bulging radially outward,
2. The joint according to claim 1, wherein a seal member seals between the joint body and the expanded portion of the pipe while the loosening prevention pin is attached to the nut. 3.   The joint according to claim 1, wherein a pin engagement hole or a pin engagement groove for detachably holding the loosening prevention pin is formed in the nut.   The joint according to any one of claims 1 to 3, wherein a convex portion is formed between the cylindrical portion and the thread portion of the joint main body. A joint body having a cylindrical portion and a thread portion located closer to the nut mounting side than the cylindrical portion is attached to an end of the pipe,
A nut is screwed into the thread portion of the joint body,
A joint installation method, wherein a loosening prevention pin is attached to the nut, and the loosening prevention pin is arranged between the cylindrical portion of the joint body and the nut.   The method according to claim 5, wherein the loosening prevention pin is attached to the nut, and at least one end of the loosening prevention pin is bent after being disposed between the cylindrical portion of the joint body and the nut.

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