JP2020176663A - Pipe separation prevention device for union nut pipe joint - Google Patents

Abstract

To provide a pipe separation prevention device for a union nut pipe joint that keeps firm locking without impairing elastic flexibility of the pipe joint while having a simple structure.SOLUTION: A retaining ring 4A comprises a pair of first protruding parts 41 and 41 protruding outward from a ring body 40A. A locking tool 5A comprises a pair of first receiving parts 52 and 52 provided in a pair of arm parts 51 and 51 extending along a pipe axis direction X from a main body part 50, and for receiving the first protruding parts 41. The first receiving parts 52 comprise: upper wall parts 52a and lower wall parts 52b protruding inward from the arm parts 51, and opposed to each other along the pipe axis direction X; and side wall parts 52c connecting the upper wall parts 52a and the lower wall parts 52b. Elastic members 11 are interposed between at least the side wall parts 52c and the protruding parts 41 in the first receiving parts 52.SELECTED DRAWING: Figure 1

Description

The present invention relates to a pipe detachment prevention device for a union nut pipe joint. More specifically, a joint body having a socket portion with a male screw engraved on the outer peripheral surface into which a non-threaded joint pipe is inserted, and a screw having an annular rubber packing interposed in the socket portion. A union nut to be jointly tightened, a stop ring attached to the outer peripheral surface of the joint pipe and tightened by a tightening means, a locking tool detachably attached to the outer peripheral surface of the union nut, and the locking tool. The present invention relates to a pipe disconnection prevention device for a union nut pipe joint including a connection holding means for holding the connection with the stop wheel.

Conventionally, as a pipe detachment prevention device for a union nut pipe joint as described above, for example, the one described in Patent Document 1 is known. In this tube detachment prevention device, as shown in FIG. 17, the locking ear portion 41'protruding from the stop ring 4'is locked to the end portion 52'of the arm 51'of the locking tool 5'. However, the arm 51'has a substantially L-shaped cross section, and a locking portion (wall) is provided only on the lower portion of the arm 51'. Therefore, when a load is applied to the stop ring 4'on a soft joint pipe 100 such as a polyethylene pipe in the circumferential direction, one of the locking ears 41'is locked to the lower portion of the arm 51', but the other. Since the arm 51'has no locking portion on the upper side, there is a risk that the arm 51'and the locking ear portion 41'will be disengaged. Further, since a play (gap) is provided between the arm 51'and the locking ear portion 41'in order to expand / contract / flex the joint pipe, the joint pipe extends and plays (gap) when water pressure is applied. ) Disappears. Then, if the joint pipe is fully extended, for example, in the case of an exposed pipe, even if it is a straight pipe at the time of connection (during construction), it becomes a meandering pipe, and there is a risk that the water pressure will be released and the pipe will not return to its original state.

Japanese Unexamined Patent Publication No. 2009-30761

In view of such conventional circumstances, the present invention provides a pipe disconnection prevention device for a union nut pipe joint that maintains a strong locking without hindering the expansion and contraction flexibility of the pipe joint while having a simple structure. The purpose is.

In order to achieve the above object, the feature of the pipe detachment prevention device for the union nut pipe joint according to the present invention is that it has a receiving portion in which a male screw is engraved on the outer peripheral surface, and an unthreaded joint pipe is inserted into the receiving portion. A joint body to be screwed, a union nut screwed and tightened by interposing an annular rubber packing in the receiving portion, a stop ring attached to the outer peripheral surface of the joint pipe and tightened by a tightening means, and the union. A pipe disconnection prevention device for a union nut pipe joint including a locking tool detachably attached to the outer peripheral surface of the nut and a connection holding means for holding the connection between the locking tool and the stop wheel. The stop ring has a pair of first projecting portions protruding outward from the ring main body, and the locking tool is provided on a pair of arm portions extending from the main body portion along the pipe axis direction. It has a pair of first receiving portions that receive the first protruding portion, and the connection holding means includes the pair of first protruding portions and the pair of first receiving portions, and the first receiving portion is the said. It is composed of an upper wall portion and a lower wall portion that protrude inward from the arm portion and face each other along the pipe axis direction, and a side wall portion that connects the upper wall portion and the lower wall portion. An elastic member is interposed between at least the side wall portion and the first protruding portion in the first receiving portion.

According to the above configuration, since the first receiving portion has an upper wall portion and a lower wall portion that project inward from the arm portion of the locking tool and face each other along the pipe axis direction, the joint pipe has a joint pipe. Even if it is locally bent and rotated in the circumferential direction, the first protruding portion comes into contact with the upper wall portion and the lower wall portion, so that the connection (locking) between the locking tool and the stop ring does not come off. Further, since the elastic member is interposed between at least the side wall portion and the first protruding portion in the first receiving portion, even if a pipe separating force is generated in the joint pipe, the elastic member absorbs the pipe separating force. , The elongation (deformation) of the joint pipe itself is suppressed. Then, when released from the tube detaching force, the elastic member returns to its original shape due to its elasticity. Therefore, it is possible to maintain the expansion / contraction / flexibility while ensuring the pipe holding force by the elastic member.

In the above configuration, the separation distance of the elastic member interposed in the pair of first receiving portions may be equal to or slightly smaller than the outer diameter of the ring body. As a result, when the stop ring with the locking tool is fitted into the union nut, the elastic member comes into contact with the ring body, and the elastic member's elasticity (repulsive force) and frictional force generated at that time cause the stop ring to union. It is held against the nut (joint body). Therefore, it is not necessary to hold the stop wheel during construction, and workability is good. Moreover, the position of the stop wheel and the union nut does not shift after the alignment, and the joint pipe can be inserted and penetrated smoothly.

Further, the ring main body includes protrusions provided at both ends thereof to which the tightening means is attached, and ribs that protrude outward from the ring main body from the protrusions to the first protruding portion. The length of the upper wall portion in the horizontal direction from the arm portion may be shorter than the length of the lower wall portion in the horizontal direction from the arm portion. The stop ring can be reinforced by providing ribs, but by making the length from the arm part of the upper wall part in the horizontal direction shorter than the length from the arm part of the lower wall part in the horizontal direction, before the start of shrinking. It prevents the rib from coming into contact with the first receiving portion and starting to reduce the diameter.

Further, the length of the upper wall portion from the side wall portion to the pipe axis direction may be shorter than the length of the lower wall portion from the side wall portion to the pipe axis direction. As a result, the locking tool may be relatively slid along the stop wheel, and workability is good.

In order to achieve the above object, another feature of the pipe detachment prevention device for the union nut pipe joint according to the present invention is that the joint pipe has a receiving portion in which a male screw is engraved on the outer peripheral surface and the receiving portion has no screw. A joint body into which a joint body is inserted, a union nut that is screwed and tightened by interposing an annular rubber packing in the receiving portion, and a stop ring that is attached to the outer peripheral surface of the joint pipe and tightened by a tightening means. In a configuration including a locking tool detachably attached to the outer peripheral surface of the union nut and a connection holding means for holding the connection between the locking tool and the stop ring, the locking tool is mounted from the main body. It has a pair of second protruding portions that project inward at the ends of the pair of arm portions extending along the pipe axis direction, and the stop ring is provided on the outer peripheral surface of the ring body, and the first It has a pair of second receiving portions that receive the two protruding portions, and the connection holding means includes the pair of second protruding portions and the pair of second receiving portions, and the second receiving portion is the ring main body. It is composed of an upper wall portion and a lower wall portion that protrude outward from the pipe and face each other along the pipe axis direction, and a side wall portion that connects the upper wall portion and the lower wall portion. An elastic member is interposed between at least the side wall portion and the second protruding portion in the receiving portion.

According to the above configuration, since the second receiving portion has an upper wall portion and a lower wall portion that protrude outward from the ring body of the stop ring and face each other along the pipe axis direction, the joint pipe is local. Even if it bends and rotates in the circumferential direction, the second protruding portion comes into contact with the upper wall portion and the lower wall portion, so that the connection (locking) between the locking tool and the stop wheel does not come off. Further, since the elastic member is interposed between at least the side wall portion and the second protruding portion in the second receiving portion, even if a pipe separating force is generated in the joint pipe, the elastic member absorbs the pipe separating force. , The elongation (deformation) of the joint pipe itself is suppressed. Then, when released from the tube detaching force, the elastic member returns to its original shape due to its elasticity. Therefore, it is possible to maintain the expansion / contraction / flexibility while ensuring the pipe holding force by the elastic member.

In the above configuration, the length of the lower wall portion from the side wall portion to the pipe axis direction is shorter than the length of the upper wall portion from the side wall portion to the pipe axis direction, and the length of the upper wall portion is said. It is preferable that the length from the side wall portion in the pipe axis direction is formed so as to be equal to or longer than the length in the pipe axis direction from the main body portion of the arm portion. As a result, the locking tool may be relatively slid along the stop wheel, and workability is good.

Further, the upper wall portion and the lower wall portion may be formed with the same width from the side wall portion to the tip end. On the other hand, the width of the upper wall portion and the lower wall portion may be gradually narrowed from the side wall portion toward the tip end.

Further, the sum of the outer diameter of the ring body in the second receiving portion and the wall thickness of the elastic member interposed in the pair of second receiving portions is the distance between the inner surfaces of the pair of arm portions. It should be equal to or slightly larger than the distance. As a result, when the stop wheel equipped with the locking tool is fitted into the union nut, the elastic member comes into contact with the main body of the locking tool, and the elasticity (repulsive force) or frictional force of the elastic member generated at that time causes the elastic member to come into contact with the main body of the locking tool. The stop wheel is held against the union nut (joint body). Therefore, it is not necessary to hold the stop wheel during construction, and workability is good. Moreover, the position of the stop wheel and the union nut does not shift after the alignment, and the joint pipe can be inserted and penetrated smoothly.

In any of the above configurations, the elastic member is a rubber member, and the height of the rubber member may be equal to or slightly larger than the distance between the upper wall portion and the lower wall portion. As a result, the rubber member is held inside the first receiving portion and the second receiving portion by its elasticity (repulsive force) and frictional force, so that the rubber member does not fall off during the work and the workability is good.

In such a case, the rubber member is preferably made of a material having a rubber hardness of 40 to 85 degrees. Within this range, deformation of the joint pipe can be suppressed without deteriorating the expansion / contraction / flexibility performance. Further, the joint pipe is, for example, a polyethylene pipe.

According to the above-mentioned feature of the union nut pipe joint pipe detachment prevention device according to the present invention, it is possible to maintain a strong locking without hindering the expansion and contraction flexibility of the pipe joint while having a simple structure. became.

Other objects, configurations and effects of the present invention will be apparent from the sections of embodiments of the invention below.

It is a front view of the pipe detachment prevention device which concerns on 1st Embodiment of this invention. It is a side view of FIG. It is a vertical cross-sectional view near the connection holding means in 1st Embodiment. It is a perspective view of the stop wheel in 1st Embodiment. It is a perspective view of the locking tool in 1st Embodiment. It is sectional drawing of the locking tool of FIG. It is a figure which shows the process of attaching a locking tool to a stop wheel. (A) is a front view of a state in which a pipe detachment prevention device is attached and a stop wheel is tightened, (b) is a partially crushed side view showing a state in which a pipe detachment force is applied in the pipe axial direction, (c). Is a partially crushed side view showing a state in which a pipe release force is applied in a direction intersecting the pipe axis direction. It is a front view of the pipe detachment prevention device which concerns on 2nd Embodiment of this invention. It is a side view of FIG. It is a vertical cross-sectional view of the vicinity of the connection holding means in the 2nd Embodiment. It is a perspective view of the stop wheel in the 2nd Embodiment. It is a perspective view of the locking tool in the 2nd Embodiment. It is a figure corresponding to FIG. 7 of the pipe detachment prevention device which concerns on 2nd Embodiment. It is a figure corresponding to FIG. 8 of the pipe detachment prevention device which concerns on 2nd Embodiment. It is a perspective view of the stop wheel in still another embodiment of this invention. It is a perspective view which shows the conventional pipe detachment prevention device.

Next, the first embodiment of the present invention will be described in more detail with reference to FIGS. 1 to 8.
As shown in FIGS. 1 to 3, the pipe detachment prevention device 1A for the union nut pipe joint according to the first embodiment of the present invention generally includes a joint body 2 into which a screwless joint pipe 100 is inserted and a joint body 2. The union nut 3 which is screwed and tightened to the receiving portion 21 of the above, the stop ring 4A which is attached to the outer peripheral surface 100a of the joint pipe 100 and is tightened by the tightening means 9, and the union nut 3 which is detachably attached to the outer peripheral surface of the union nut 3. The locking tool 5A is provided.

In the present embodiment, the joining pipe 100 is, for example, a polyethylene pipe, and has a nominal diameter of 10 to 25. In the case of a polyethylene pipe, it is difficult to prevent the pipe from coming off unless the diameter is slightly reduced from the outer diameter of the pipe via the stop ring 4A. The pipe detachment prevention device 1A according to the present invention is a plastic pipe having such elasticity and flexibility (flexibility), and the elasticity and flexibility of the pipe joint are not hindered and is sufficient. Securing and maintaining the holding power (removal prevention power) and improving workability (workability).

As shown in FIGS. 1 to 3, the joint body 2 includes a tapered receiving portion 21 and a male screw 22 engraved on the outer peripheral surface thereof. The male screw 22 is screwed with the female screw 32 engraved on the inner peripheral surface of the union nut 3. An annular rubber packing 23 is interposed between the receiving portion 21 and the union nut 3. By screwing and tightening the union nut 3 to the receiving portion 21, the rubber packing 23 is compressed and deformed to ensure water stoppage. An annular fitting groove 31 into which the main body 50 of the locking tool 5A, which will be described later, is fitted is provided on the outer peripheral surface of the union nut 3.

As shown in FIGS. 1 to 4, the stop ring 4A includes a ring body 40A having a C-ring shape, a pair of first projecting portions 41 and 41 protruding outward from the ring body 40A, and a ring body 40A. It has a pair of projecting pieces 42, 42 protruding outward from both ends. The projecting piece 42 is provided with a through hole 42a through which the bolt 9a of the tightening means 9 is inserted. Further, on the inner surface of the ring body 40A, an annular tooth portion 43 for suppressing slippage of the joining pipe 100 is formed.

The first protruding portion 41 has a substantially rectangular shape and is erected on the edge portion of the ring main body 40A on the joint main body 2 side. The first protruding portion 41 is located at an intermediate portion between the end portion (projection piece 42) of the ring main body 40A and the circumferential central portion 40c (slit 45) of the ring main body 40A, and is symmetrical with respect to the circumferential central portion 40c. A pair is provided so as to be.

In the present embodiment, a slit 45 is formed in the central portion 40c in the circumferential direction of the ring body 40A, and a bifurcated portion 46 is provided so as to straddle the slit 45. As a result, even if the diameter of the joint pipe 100 having a relatively small diameter is deeply (largely) reduced, the stop ring 4A does not crack or break, and the tooth portion 43 is made to bite into the joint pipe 100 to allow the joint pipe 100 to bite. To hold. Further, the ring main body 40A includes a rib 47 that protrudes outward from the ring main body 40A from the projecting piece 42 to the first protruding portion 41.

As shown in FIGS. 5 and 6, the locking tool 5A includes a main body portion 50 having a horseshoe shape, and a pair of arm portions 51, 51 extending from both ends of the main body portion 50 along the pipe axis direction X. And a first receiving portion 52 provided on each arm portion 51 and receiving the first protruding portion 41. The arm portion 51 is formed with an upper gap portion 51a through which the first protrusion 41 can be inserted between the main body portion 50 and the upper wall portion 52a of the first receiving portion 52, and the main body portion 50 and the first receiving portion 52 are formed. A lower gap portion 51b through which the flange 33 of the union nut 3 can be inserted is formed between the lower wall portion 52b and the lower wall portion 52b.

The first receiving portion 52 protrudes inward from the arm portion 51 (center of the main body portion 50) and faces the upper wall portion 52a and the lower wall portion 52b along the pipe axis direction X, and the upper wall portion. It is composed of a side wall portion 52c that connects the 52a and the lower wall portion 52b, and has a substantially U-shaped cross section. The side wall portion 52c is provided at the end portion (joint pipe 100 side) of the arm portion 51. The first protruding portion 41 and the elastic member 11 described later are housed inside the first receiving portion 52 surrounded by the wall portions 52a to 52c.

Here, as shown in FIG. 6, the length (width W1) of the upper wall portion 52a from the arm portion 51 in the horizontal direction Y is the length (width W1) of the lower wall portion 52b from the arm portion 52 in the horizontal direction Y. Shorter (smaller) than W2). By reducing the width W1 of the upper wall portion 52a, it is possible to prevent the rib 47 from coming into contact with the first receiving portion 52 before the start of shrinkage, and prevent the ring body 40A from being reduced in diameter.

Further, as shown in FIG. 7, the length L1 from the side wall portion 52c of the upper wall portion 52a to the pipe axis direction X is shorter than the length L2 from the side wall portion 52c of the lower wall portion 52b in the pipe axis direction X. .. In other words, the distance S1 of the upper gap 51a is larger than the thickness T (length of the pipe axis direction X) of the first protrusion 41, and the distance S2 of the lower gap 51b is the thickness of the first protrusion 41. It is smaller than T (length of tube axis direction X). Therefore, when the locking tool 5A is attached (fitted) to the stop ring 4A, the main body 50 may be relatively slid (inserted) along the surface 40s of the ring main body 40A for good workability. Moreover, after sliding, the first protruding portion 41 does not fall off from the first receiving portion 52.

In the present embodiment, the connection holding means 10A for holding the connection between the locking tool 5A and the locking tool 4A is the first receiving portion 41 of the locking tool 4A facing the pipe axial direction X and the locking tool 5A. It is composed of a part 52. A rubber member 11 as an elastic member is interposed between the side wall portion 52c of the first receiving portion 52 and the first protruding portion 42.

In the present embodiment, as shown in FIG. 6, the height H1 of the rubber member 11 is equal to or slightly larger than the height (interval) H2 between the upper wall portion 52a and the lower wall portion 52b. As a result, by pushing the rubber member 11 into the first receiving portion 52, the rubber member 11 is held inside the first receiving portion 52 by its elasticity (repulsive force) and frictional force, and thus is locked to the stop ring 4A. When mounting (fitting) the tool 5A, it is not necessary to support the rubber member 11 by hand, and workability is good. Of course, it is not necessary to fix the rubber member 11 to the first receiving portion 52 with an adhesive or the like. The term "equal to or slightly larger" means that the rubber member 11 is in contact with the rubber member 11 to the extent that a frictional force is generated, or the rubber member 11 is enlarged to the extent that an elastic force (repulsive force) is generated and pushed into the first receiving portion 52. It means the dimensional relationship that becomes.

Moreover, the separation distance D1 between the elastic members 11 and 11 interposed inside the pair of first receiving portions 52 and 52 facing each other is equal to or slightly smaller than the outer diameter R of the ring body 40A. As a result, the rubber member 11 comes into contact with the ring body 40A when the stop ring 4A to which the locking tool 5A is attached is fitted into the union nut 3. Therefore, the stop ring 4A is held against the union nut 3 (joint body 2) by the elasticity (repulsive force) and frictional force of the rubber member 11 generated at that time, so that it is necessary to support the stop ring 4A at the time of construction. Absent. Moreover, the alignment (concentricity) between the stop wheel 4A and the union nut 3 (joint body 2) can be easily performed, and the misalignment can be prevented after the alignment. Therefore, the insertion / penetration work of the joining pipe 100 can be performed smoothly.

The rubber member 11 is preferably made of a material having a rubber hardness of 40 to 85 degrees. With this hardness, deformation of the joint pipe 100 can be suppressed without deteriorating the expansion / contraction / flexibility performance. Then, by adjusting the rubber hardness of the rubber member 11, the strength of expansion and contraction / flexibility can be adjusted. The material of the rubber member 11 may be any material having elasticity, for example, styrene rubber (SBR), nitrile rubber (NBR), ethylene propylene rubber (EPDM), chloroprene rubber (CR), urethane rubber (U). ), Natural rubber (NR) and the like.

Next, the state of expansion / contraction / flexure after the pipe detachment prevention device 1A is attached will be described.
FIG. 8A shows a pipe detachment prevention device 1A in a state where the stop ring 4A is reduced in diameter by the tightening means 9. In this state, the stop wheel 4A and the union nut 3 are close to each other as shown in FIG. 2, and can be expanded and contracted and flexed by the connection holding means 10A. When a pipe disconnection force F1 is generated in the joint pipe 100 in the pipe axial direction X, the stop ring 4A is separated from the union nut 3 as shown in FIG. 8 (b), but the rubber in the first receiving portion 52 is formed. The pipe detaching force F1 is absorbed by the member 11, and the extension of the joint pipe 100 itself is suppressed. Moreover, when released from the tube detaching force F1, the rubber member 11 returns to its original shape due to its elasticity.

Further, as shown in FIG. 8C, when the pipe disconnection force F2 is generated in the direction intersecting the pipe axial direction X, the stop wheel 4A is inclined (flexible) with respect to the union nut 3. Also in this case, since the rubber member 11 absorbs the pipe separating force F2, the elongation of the joint pipe 100 is suppressed. As described above, since the rubber member 11 absorbs the pipe detaching forces F1 and F2 and returns to the original shape by elasticity, it is possible to maintain the expansion / contraction / flexibility while securing the pipe holding force. Therefore, for example, even if the joint pipe 100 is constructed after applying a test water pressure, it can function as a union nut pipe joint having elasticity and flexibility.

Next, the second embodiment of the present invention will be described with reference to FIGS. 9 to 13.
In the following embodiments, the same members as those in the first embodiment are designated by the same reference numerals.
In the pipe disconnection prevention device 1B for the union nut pipe joint according to the second embodiment of the present invention, the stop ring 4B and the locking tool 5B are different from the stop ring 4A and the locking tool 5A of the first embodiment. In the present embodiment, the nominal diameter of the joining pipe 100 is, for example, 30 to 50.

As shown in FIGS. 9 to 12, the stop ring 4B is provided on the outer peripheral surface of the ring body 40B instead of the first protrusion 41 of the first embodiment, and the second protrusion 55 of the locking tool 5B described later is provided. It has a pair of second receiving portions 48, 48 that receive. Further, the ring body 40B is not provided with the slit 45 and the bifurcated portion 46, which is different from the ring body 40A of the first embodiment.

As shown in FIG. 13, the locking tool 5B replaces the first receiving portion 52 of the first embodiment with the ends of a pair of arm portions 51, 51 extending from the main body portion 50 along the pipe axis direction X. The portion has a second protruding portion 55 that projects inward (the center of the main body portion 50). Unlike the first embodiment, the arm portion 51 is not formed with the upper gap portion 51a and the lower gap portion 51b.

The second receiving portion 48 of the stop ring 4B protrudes outward from the ring main body 40B and faces the upper wall portion 48a and the lower wall portion 48b along the pipe axis direction X, and is upward on the joint body 2 side. It is composed of a side wall portion 48c connecting the wall portion 48a and the lower wall portion 48b, and has a substantially U-shaped cross section. The second protruding portion 55 and the rubber member 11 at the tip are housed inside the second receiving portion 48 surrounded by the wall portions 48a to 48c. In the present embodiment, the upper wall portion 48a and the lower wall portion 48b are formed with the same width (along the pipe axis direction X) from the side wall portion 48c to the tip end.

Here, as shown in FIG. 14, the length L3 from the side wall portion 48c of the lower wall portion 48b in the pipe axial direction X is larger than the length L4 from the side wall portion 48c of the upper wall portion 48a in the pipe axial direction X. It is short and the length L4 of the upper wall portion 48a is formed so as to be longer than the length L5 in the pipe axis direction X from the main body portion 50 of the arm portion 51. Therefore, when the locking tool 5B is attached (fitted) to the stop ring 4B, the main body 50 may be relatively slid (inserted) along the surface 40s of the ring main body 40B, and workability is good. Moreover, after sliding, the second protruding portion 55 does not fall off from the second receiving portion 48.

Further, as shown in FIG. 9, the sum of the outer diameter R of the ring body 40B in the second receiving portion 48 and the wall thickness W3 of each rubber member 11 interposed inside the second receiving portion 48 (R + 2 × W3). Is equal to or slightly larger than the horizontal distance D2 between the inner side surfaces 51s and 51s of the pair of arm portions 51 and 51 facing each other. As a result, the rubber member 11 comes into contact with the arm portion 51 when the stop ring 4B to which the locking tool 5B is attached is fitted into the union nut 3. Therefore, as in the first embodiment, the stop wheel 4B is held against the union nut 3 (joint body 2) by the elasticity (repulsive force) and frictional force of the rubber member 11 generated at the time of contact, so that during construction. It is not necessary to support the stop wheel 4B, and the alignment (concentricity) between the stop wheel 4B and the union nut 3 (joint body 2) becomes easy.

Further, as shown in FIG. 12, in this embodiment as well, the height H1 of the rubber member 11 is equal to or slightly larger than the distance H3 between the upper wall portion 48a and the lower wall portion 48b. As a result, as in the first embodiment, the rubber member 11 is held inside the second receiving portion 48 by the elasticity (repulsive force) and the frictional force.

In the present embodiment, the connection holding means 10B for holding the connection between the locking tool 5B and the locking tool 4B is a second receiving portion 48 of the locking wheel 4B facing the pipe axial direction X and a second protrusion of the locking tool 5B. It consists of a part 55. A rubber member 11 as an elastic member is interposed between the side wall portion 48c of the second receiving portion 48 and the second protruding portion 55.

As shown in FIGS. 15 (a) to 15 (c), also in the pipe detachment prevention device 1B shown in the present embodiment, the pipe detachment force F1 is formed by the rubber member 11 of the second receiving portion 48 as in the first embodiment. , F2 is absorbed, the elongation (deformation) of the joint pipe 100 is suppressed, and the rubber member 11 returns to its original shape due to its elasticity. Therefore, the expansion and contraction / flexibility should be ensured while maintaining the pipe holding force. Is possible.

Finally, the possibility of still another embodiment of the present invention will be described.
In the second embodiment, the length (width) of the upper wall portion 48a and the lower wall portion 48b of the second receiving portion 48 in the horizontal direction Y of the stop ring 4B is the same. However, the shape of the second receiving portion 48 is not limited to the above. For example, as shown in FIG. 16, the length (width) of the upper wall portion 48a1 and the lower wall portion 48b1 may be gradually shortened from the side wall portion 48c1 toward the tip end (along the pipe axis direction X). However, the second embodiment is superior in terms of holding and stability of the elastic member 11.

In each of the above embodiments, a substantially square rubber member was used as the elastic member 11. However, the shape of the rubber member is not limited to this, and for example, the cross section may be a columnar shape such as a circle, a semicircle, an ellipse, or a polygon. Further, a sheet-shaped rubber member may be wound around the peripheral surface of the first protruding portion 41, and may have a U-shaped cross section surrounding the three sides of the first protruding portion 41 or a cap-shaped member covering the first protruding portion 41. There may be. As described above, particularly if the first receiving portion 52 and the second receiving portion 48 have a shape that can be interposed between at least the side wall portions 52c and 48c and the first protruding portion 41 and the second protruding portion 55. Not limited.

Further, in each of the above embodiments, a polyethylene pipe has been described as an example of the joining pipe 100. However, the material of the joining pipe 100 is not limited to this, and may be, for example, a vinyl chloride pipe or a steel pipe. Further, it can be applied not only to a pipe (pipe fitting) capable of expanding and contracting, but also to a fixed pipe.

1A, 1B: Pipe detachment prevention device 2: Joint body 3: Union nut, 4A, 4B, 4C: Stop ring, 5A, 5B: Locking tool, 9: Tightening means, 9a: Bolt, 9b: Nut, 10A , 10B: Connection holding means, 11: Elastic member (rubber member), 21: Receptacle, 22: Male screw, 23: Rubber packing, 31: Fitting groove, 32: Female screw, 33: Flange, 40A, 40B: Ring Main body, 40c: Central part in the circumferential direction, 40s: Surface, 41: First protrusion, 42: Projection piece, 42a: Through hole, 43: Tooth part, 45: Slit, 46: Bifurcated part, 47: Rib, 48, 481: Second receiving part, 48a, 48a1: Upper wall part, 48b, 48b1: Lower wall part, 48c, 48c1: Side wall part, 50: Main body part, 51: Arm part, 51a: Upper gap part, 51b: Lower gap Part, 51s: Inner surface, 52: First receiving part, 52a: Upper wall part, 52b: Lower wall part, 52c: Side wall part, 55: Second protruding part, 100: Joint pipe, 100a: Outer peripheral surface, D1, D2: Separation distance, F1, F2: Pipe detachment force (load), H1 to H3: Height, L1 to L5: Length, R: Outer diameter, S1, S2: Interval, T: Thickness, W1, W2: Width, X: Pipe axis direction, Y: Horizontal direction, Z: Vertical direction

Claims (12)

A joint body having a socket with a male screw engraved on the outer peripheral surface into which a non-screw joint pipe is inserted, and an annular rubber packing are interposed in the socket to tighten the joint. A union nut, a stop ring attached to the outer peripheral surface of the joint pipe and tightened by a tightening means, a locking tool detachably attached to the outer peripheral surface of the union nut, and the locking tool and the stop ring. A pipe disconnection prevention device for a union nut pipe joint provided with a connection holding means for holding the connection with.
The stop ring has a pair of first protrusions that project outward from the ring body.
The locking tool is provided on a pair of arm portions extending from the main body portion along the pipe axis direction, and has a pair of first receiving portions for receiving the first protruding portion.
The connection holding means includes the pair of first protruding portions and the pair of first receiving portions.
The first receiving portion connects the upper wall portion and the lower wall portion, which project inward from the arm portion and face each other along the pipe axis direction, and the upper wall portion and the lower wall portion. A pipe detachment prevention device for a union nut pipe joint, which is composed of a side wall portion to be formed and an elastic member is interposed between at least the side wall portion and the first protruding portion in the first receiving portion. The pipe detachment prevention device for a union nut pipe joint according to claim 1, wherein the separation distance of the elastic member interposed in the pair of first receiving portions is equal to or slightly smaller than the outer diameter of the ring body. The ring body includes protrusions provided at both ends thereof and to which the tightening means is attached, and ribs protruding outward from the ring body from the protrusions to the first protrusions, and the upper wall thereof. The pipe detachment prevention device for a union nut pipe joint according to claim 1 or 2, wherein the length of the portion in the horizontal direction from the arm portion is shorter than the length of the lower wall portion in the horizontal direction from the arm portion. The union according to any one of claims 1 to 3, wherein the length of the upper wall portion from the side wall portion to the pipe axis direction is shorter than the length of the lower wall portion from the side wall portion to the pipe axis direction. Pipe disconnection prevention device for nut pipe joints. A joint body having a socket with a male screw engraved on the outer peripheral surface into which a non-screw joint pipe is inserted, and an annular rubber packing are interposed in the socket to tighten the joint. A union nut, a stop ring attached to the outer peripheral surface of the joint pipe and tightened by a tightening means, a locking tool detachably attached to the outer peripheral surface of the union nut, and the locking tool and the stop ring. A pipe disconnection prevention device for a union nut pipe joint provided with a connection holding means for holding the connection with.
The locking tool has a pair of second protrusions that project inward at the ends of the pair of arm portions that extend from the main body along the pipe axis direction.
The stop ring is provided on the outer peripheral surface of the ring body and has a pair of second receiving portions for receiving the second protruding portion.
The connection holding means includes the pair of second protruding portions and the pair of second receiving portions.
The second receiving portion connects the upper wall portion and the lower wall portion that protrude outward from the ring main body and face each other along the pipe axis direction, and the upper wall portion and the lower wall portion. A pipe detachment prevention device for a union nut pipe joint, which is composed of a side wall portion to be formed and an elastic member is interposed between at least the side wall portion and the second protruding portion in the second receiving portion. The length of the lower wall portion from the side wall portion to the pipe axis direction is shorter than the length of the upper wall portion from the side wall portion to the pipe axis direction, and from the side wall portion of the upper wall portion. The pipe detachment prevention device for a union nut pipe joint according to claim 5, wherein the length in the pipe axis direction is formed so as to be equal to or longer than the length in the pipe axis direction from the main body portion of the arm portion. The pipe detachment prevention device for a union nut pipe joint according to claim 5 or 6, wherein the upper wall portion and the lower wall portion have the same width from the side wall portion to the tip end. The pipe detachment prevention device for a union nut pipe joint according to claim 5 or 6, wherein the width of the upper wall portion and the lower wall portion is gradually narrowed from the side wall portion toward the tip end. The sum of the outer diameter of the ring body in the second receiving portion and the wall thickness of the elastic member interposed in the pair of second receiving portions is the separation distance between the inner surfaces of the pair of arm portions. The pipe detachment prevention device for a union nut fitting according to any one of claims 5 to 8, which is equal to or slightly larger than the above. The union nut pipe joint according to any one of claims 1 to 9, wherein the elastic member is a rubber member, and the height of the rubber member is equal to or slightly larger than the distance between the upper wall portion and the lower wall portion. Tube detachment prevention device. The pipe detachment prevention device for a union nut pipe joint according to claim 10, wherein the rubber member is made of a material having a rubber hardness of 40 degrees to 85 degrees. The pipe detachment prevention device for a union nut pipe joint according to any one of claims 1 to 11, wherein the joint pipe is a polyethylene pipe.

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