JP2004340365A - Fluid pipe separation prevention unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid pipe separation prevention unit capable of obtaining a high water tightness by providing a high fluid pipe separation prevention effect and a large press-in distance of a packing. <P>SOLUTION: When a pressing ring 4 is tightened, the diameter is reduced by bringing a taper face 5a of a guide ring 5 into slide contact with its cylindrical guide face 4a and an edge 13 of a lock ring 6 fitted to an annular groove 12 bites into the fluid pipe 2 and stops moving the guide ring 5. When the pressing ring 4 is tightened furthermore in this condition, the ring 4 is moved by the action of the cylindrical guide face 4a and the press-in distance into an enlarged diameter part 3a of the packing 8 is increased by moving a packing press ring 7 to press inward largely. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing separation of fluid pipes, which is attached to a connection portion between fluid pipes such as a water pipe, a gas pipe, and a pipe for a plant to prevent the pipes from separating.

  As a conventional fluid pipe detachment prevention device of this kind, a packing is accommodated in an enlarged diameter portion formed at a side end of a joint body (one pipe), and an inner surface of a push ring fastened to a side end of the joint body. A radially elastically deformable lock ring having a blade formed on the inner peripheral surface that cuts into the outer peripheral surface of the fluid pipe (the other pipe) is housed on the tapered surface side of the seal ring. By pushing the retainer sandwiched between the seal ring and the lock ring, the packing is pushed into the enlarged diameter portion to ensure watertightness, and the lock ring blade is cut into the outer peripheral surface of the fluid pipe, and the fluid is removed. There is one designed to prevent detachment of a pipe (for example, see Patent Document 1).

JP-A-11-325348 (FIG. 4, etc.)

  The conventional detachment prevention device described in Patent Literature 1 has an advantage that the blade of the lock ring can be cut into the outer peripheral surface of the other fluid pipe after the packing is pushed into the enlarged diameter portion. When the pressing reaction force of the packing increases, the lock ring held by the pressing ring by friction moves to the inner side of the pressing ring, bites into the other fluid pipe, and further presses the packing via the retainer. There was a risk that they could not do it. In this case, when a fluid having a high pressure is allowed to flow, the fluid may leak from the packing portion.

  The present invention has been made in view of the above problems, and provides a fluid pipe detachment prevention device that has a large effect of preventing the fluid pipe from being detached, and that can secure a high watertightness by increasing the amount of pushing of the packing. It is aimed at.

In order to achieve the above object, a fluid pipe detachment prevention device according to claim 1 of the present invention inserts an insertion port end of one fluid pipe into a receiving port end of another fluid pipe, and connects the pipes with each other. A device for preventing detachment of a fluid pipe that prevents the fluid from coming off, comprising a packing inserted into an enlarged diameter portion of one of the fluid pipes, fixed to one of the fluid pipes by fastening means, and an inner side of one of the fluid pipes. The peripheral surface forms a cylindrical guide surface having the same inner diameter, and the inner peripheral surface at the outer end continuous with the peripheral surface forms a tapered guide surface whose outer end side gradually decreases in diameter. While abutting against the side surface, the inner side end portion is a packing pressing ring that can be inserted into the enlarged diameter portion while pressing the packing, and at least the outer peripheral surface on the outer end side is a tapered guide surface of the pressing ring. Make a tapered surface with almost the same slope, and A guide ring having an annular groove on an inner peripheral surface that moves in the radially decreasing direction by sliding outwardly in sliding contact with the tapered guide surface and the tapered guide surface; And a lock ring housed in the annular groove and having a blade on its inner peripheral surface that can bite into the outer peripheral surface of the other fluid pipe.
According to this feature, when the fastening of the pressing ring is started by the fastening means, the tapered surface of the guide ring slides against the cylindrical guide surface of the pressing ring, so that the guide ring is reduced in diameter together with the lock ring, and the blade of the lock ring is When the lock ring bites into the outer peripheral surface of the fluid pipe, the movement of the lock ring in the pipe axis direction stops. When the pressing ring is further tightened in this state, the packing pressing ring is pushed inward by the inner surface of the pressing ring, and the packing is strongly pressed by the inner surface, and is pushed into the enlarged diameter portion of one of the fluid pipes. The packing is pressed while the outer peripheral surface of the guide ring slides on the cylindrical guide surface of the press ring, that is, until the tapered surface of the guide ring comes into contact with the tapered guide surface of the press ring. The amount can be large.

According to a second aspect of the present invention, there is provided a fluid pipe detachment prevention device according to the first aspect, wherein the guide ring is formed in a partially circular shape that is elastically deformable in a radially decreasing direction. It is characterized by having.
According to this feature, if the guide ring is formed in a partially circular shape that can be elastically deformed in the diameter reducing direction, it can be easily moved in the diameter reducing direction and the guide ring can be easily assembled.

According to a third aspect of the present invention, there is provided a fluid pipe detachment prevention device according to the first aspect, wherein the guide ring comprises a plurality of divided pieces. .
According to this feature, for example, if the shape is the same for all the divided pieces, the diameter can be reduced uniformly, and even if the pieces are partially damaged, only the divided pieces need to be replaced.

According to a fourth aspect of the present invention, there is provided a fluid pipe detachment prevention device according to any one of the first to third aspects, wherein the lock ring has a cut-off portion capable of being elastically deformed in a diameter decreasing direction. It is characterized by being configured in a circular shape.
According to this feature, if the lock ring is formed in a partially circular shape that can be elastically deformed in the diameter reducing direction, it can be easily moved in the diameter reducing direction and the lock ring can be easily assembled.

According to a fifth aspect of the present invention, there is provided a fluid pipe detachment prevention device according to any one of the first to third aspects, wherein the lock ring includes a plurality of divided pieces. It is characterized by:
According to this feature, if, for example, all the divided pieces have the same shape, it is possible to cut in evenly by reducing the diameter, and even if some of the blades are damaged, only the divided pieces need to be replaced.

A fluid pipe separation prevention device according to claim 6 of the present invention is the fluid tube separation prevention device according to any one of claims 1 to 5, wherein the guide ring is made of a hard synthetic resin having a small frictional resistance. It is characterized by forming.
According to this feature, the manufacturing cost of the guide ring is reduced, and the sliding resistance with the push ring is reduced, so that the tightening force of the push ring is reduced and the diameter of the guide ring can be easily reduced.

A fluid pipe detachment prevention device according to claim 7 of the present invention is the fluid tube detachment prevention device according to any one of claims 1 to 6, wherein the annular groove of the guide ring has a concave cross section, It is characterized in that the lock ring has a rectangular cross section substantially the same as the annular groove.
According to this feature, the diameter of the lock ring can be reduced while being stably accommodated in the annular groove.

The fluid pipe detachment prevention device according to claim 8 of the present invention is the fluid pipe detachment prevention device according to any one of claims 1 to 7, wherein the cylindrical guide surface of the press ring has a dimension in the pipe axis direction. Is required to be larger than the dimension of the tapered surface of the guide ring in the tube axis direction.
According to this feature, the distance until the tapered surface of the guide ring comes into contact with the tapered guide surface of the pressing ring becomes longer, and during that time, the pressing ring continues to push the packing pressing ring, so that the amount of pushing of the packing increases. Can be.

According to a ninth aspect of the present invention, there is provided a fluid pipe detachment prevention device according to any one of the first to eighth aspects, wherein an outer peripheral portion of the packing pressing ring on one fluid pipe side. In addition, a contact portion that regulates the maximum pushing amount of the packing by contacting the side end surface of one of the pipes is provided.
According to this feature, damage to the packing is prevented.

A fluid pipe detachment prevention device according to claim 10 of the present invention is the fluid tube detachment prevention device according to any one of claims 1 to 9, wherein the inner surface in the annular groove of the guide ring and the lock ring are connected to each other. A cushion ring or a spacer ring is inserted between them.
According to this feature, the amount of bite (depth) of the blade of the lock ring into the fluid pipe can be easily determined by the material of the fluid pipe without replacing the guide ring or the lock ring with one having another shape. Can be adjusted.

  Embodiments of the present invention will be described below.

  FIG. 1 shows an embodiment in which a fluid pipe 2, 2 such as a water pipe made of synthetic resin, for example, vinyl chloride is connected using the detachment prevention device 1 of the present invention.

  The disengagement prevention device 1 includes a joint body 3, a press ring 4, a guide ring 5, a lock ring 6, a packing pressing ring 7, a packing 8, and a fastening means 9 for connecting the joint body 3 and the press ring 4, and each member excluding the joint body. Are provided symmetrically in pairs. In this embodiment, an example in which the left and right fluid pipes 2 and 2 are connected by the joint body 3 will be described. However, the joint body 3 is one fluid pipe, and the enlarged diameter portion 3a of the fluid pipe 3 is used. It is needless to say that the present invention can be applied to a case in which the insertion port end 2a of the other fluid pipe 2 is inserted into the receiving port end of the other.

  The joint main body 3 is formed in a tubular shape by, for example, ductile cast iron or the like, and a packing 8 such as rubber is accommodated in the inner peripheral surface of the enlarged diameter portion 3a formed at the left and right side end portions.

  The pressing wheel 4 is also formed in a cylindrical shape from cast iron, and a substantially half of the inner peripheral surface on the inner end side is a cylindrical guide surface 4a having the same inner diameter, and a substantially half of the inner peripheral surface on the outer end side is a cylindrical member. The guide ring 5 and the lock ring are provided between the inner peripheral surface and the outer peripheral surface of the fluid pipe 2 between the inner peripheral surface and the outer peripheral surface of the fluid pipe 2. An annular space for accommodating 6 is formed.

  The joint body 3 and the pressing wheel 4 are provided by attaching a T-head bolt 10 as a fastening means 9 and a cap nut 11 to a plurality of locations of the flanges 3b and 4c protruding from the outer peripheral surface of their opposed ends. Has been concluded.

  The guide ring 5 is formed of a hard synthetic resin having a small frictional resistance, for example, an acetal resin, so that its outer diameter at free time is slightly larger than the maximum inner diameter of the press ring 4, and as shown in FIG. Is cut off to form a missing circle, so that it can be elastically deformed in the radial direction.

  On the inner peripheral surface of the guide ring 5, there is formed an annular groove 12 having a concave cross section, into which the lock ring 6 can be inserted and removed. A tapered surface 5 a having the same inclination as that of the tapered guide surface 4 b of the press ring 4 is formed in substantially a half of the outer periphery of the outer peripheral surface of the guide ring 5. The dimension of the cylindrical guide surface 4a of the press ring 4 in the tube axis direction is larger than the dimension of the tapered surface 5a in the tube axis direction.

  The lock ring 6 is formed in a rectangular cross section by, for example, stainless steel, and is fitted in the annular groove 12 of the guide ring 5 by cutting off a part in the circumferential direction to form a cutout circle as shown in FIG. , The elastic member can be elastically deformed in the diameter reducing direction integrally with the guide ring 5.

  On the inner peripheral surface of the lock ring 6, a blade 13 having a sawtooth cross section that can bite into the outer peripheral surface of the fluid pipe 2 is formed in the pipe axis direction.

  The packing pressing ring 7 is formed of stainless steel or the like, and has a packing pushing-in portion 7a which can be inserted into the enlarged diameter portion 3a of the joint body 3 at an inner end thereof, and a joint pushing portion 7a at an outer peripheral portion thereof. A large-diameter contact portion 7b is formed between the inner surface of the joint body 3 and the outer surface of the push ring 4, and the large-diameter abutment portion 7b is in contact with the inner side end surface of the push wheel 4 between the inner surface 3 and the push ring 4. ing.

  In order to connect the fluid pipes 2 using the pipe joint 1 of the above embodiment, first, as shown in FIG. The guide ring 5 and the lock ring 6 (the lock ring is previously assembled to the guide ring), the packing pressing ring 7, and the packing 8 are fitted between the press ring 4 and the enlarged diameter portion 3a of the joint body 3, and The flange 3b of the main body 3 and the flange 4c of the pressing wheel 4 are temporarily fixed with a T-head bolt 10 and a cap nut 11.

  At this time, the tapered surface 5 a of the outer peripheral surface of the guide ring 5 is slightly inserted into the press ring 4, and the inner side surface of the guide ring 5 is formed on the inner diameter side of the contact portion 7 b of the packing pressing ring 7. Make contact.

  Next, as shown in FIG. 5, the cap nut 11 is gradually tightened, and the pressing wheel 4 is moved to the joint body 3 side. Then, the tapered surface 5a of the guide ring 5 moves relatively to the inner part of the cylindrical guide surface 4a of the press ring 4, so that the guide ring 5 and the lock ring 6 fitted thereto are elastically deformed in the diameter reducing direction. The blade 13 of the lock ring 6 is slightly deformed and bites into the outer peripheral surface of the fluid pipe 2. At the same time, the pressing of the packing 8 is started by the side end of the contact portion 7b of the packing pressing ring 7 abutting on the inner side surface of the pressing wheel 4.

  When the cap nut 11 is further tightened in this state, the flat outer peripheral surface of the guide ring 5 relatively slides outward along the cylindrical guide surface 4a of the press ring 4, as shown in FIG. Accordingly, only the packing pressing ring 7 is pressed inward while the guide ring 5 is not moved, and the packing 8 is strongly pushed into the enlarged diameter portion 3 a of the joint body 3.

  At this time, since the dimension of the cylindrical guide surface 4a of the press ring 4 in the tube axis direction is larger than the tapered surface 5a of the guide ring 5, the packing pressing ring 7 is kept until the tapered surface 5a comes into contact with the tapered guide surface 4b. Pressed enough.

  The maximum pushing amount of the packing 8 depends on whether the side surface of the flange 4c of the press ring 4 is in contact with the flange 3b of the joint body 3 or the inner side surface (stopper surface) of the contact portion 7b of the packing pressing ring 7 is on the side of the joint body 3 It is regulated by contact with the end face.

  FIG. 6 shows a state in which the connection of the fluid pipe 2 is completed. In this state, when a pull-out force acts on the fluid pipe 2, the lock ring 6 and the guide ring 5 are moved outward together with the fluid pipe 2 as shown in FIG. , The tapered surface 5a comes into contact with the tapered guide surface 4b of the pressing wheel 4, and the diameter is strongly reduced by the wedge action.

  Accordingly, the diameter of the lock ring 6 is also reduced, and the blade 13 bites into the outer peripheral surface of the fluid pipe 2, thereby preventing the fluid pipe 2 from being strongly detached.

  FIG. 8 is a partial cross-sectional view of the embodiment in which the cushion ring is inserted into the annular groove of the guide ring. After the cushion ring 14 is inserted into the annular groove 12 of the guide ring 5 and the lock ring 6 is housed, the lock is achieved. The diameter of the ring 6 can be adjusted.

  That is, when the fluid pipe 2 is hard, such as a steel pipe or a cast iron pipe, if the cushion ring 14 is inserted, the bite amount of the blade 13 of the lock ring 6 is reduced, so that the blade spill can be eliminated.

  FIG. 9 is a partial cross-sectional view showing a modification of the lock ring housed in the guide ring at the time when the pressing ring tightening is completed. In the annular groove 12 having the concave cross-section of the guide ring 5, the outer peripheral portion in the cross-sectional shape is shown. An arc-shaped lock ring 6 'is housed.

  In this state, when a pull-out force acts on the fluid pipe 2, the lock ring 6 ′ and the guide ring 5 move outward together with the fluid pipe 2, so that the tapered surface 5 a contacts the tapered guide surface 4 b of the pressing ring 4, Due to the wedge action, the diameter is strongly reduced, and at the same time, the lock ring 6 ′ is tilted, so that the blade 13 ′ bites deeply into the outer peripheral surface of the fluid pipe 2. The tilting of the lock ring 6 ′ prevents the guide ring 5 from being subjected to excessive stress.

  As described above, in the pipe joint 1 according to the embodiment of the present invention, the lock rings 6 and 6 ′ are housed in the annular groove 12 on the inner peripheral surface of the guide ring 5 made of synthetic resin, and the pressing ring 4 is being tightened. After the lock rings 6 and 6 ′ are reduced in diameter via the guide ring 5 and cut into the outer peripheral surface of the fluid pipe 2 and stopped, only the pressing ring 4 is guided by the cylindrical guide surface 4 a on the inner surface thereof. Since it can be further moved to the joint body 3 side, the amount of movement of the packing pressing ring 7 can be increased.

  As a result, the pressing amount of the packing 8 by the packing pressing ring 7 becomes large, and high watertightness is secured.

  Further, when a pull-out force acts on the fluid pipe 2, the tapered surface 5a of the guide ring 5 moves to the tapered guide surface 4b side of the press ring 4, and the lock rings 6, 6 'are further reduced in diameter, so that the blade 13 Is deeply penetrated into the outer peripheral surface of the fluid pipe 2, so that the detachment preventing effect of the fluid pipe 2 is also increased.

  The outer peripheral surfaces of the lock rings 6 and 6 'do not need to be tapered as in the prior art, and are simple in shape and can be miniaturized, so that the manufacturing cost is reduced and the reaction force at the time of diameter reduction is also reduced. Also, the tightening force of the pressing wheel 4 is reduced.

  Further, even if a spacer ring is inserted instead of the cushion ring 14, the bite amount of the lock rings 6, 6 'can be adjusted.

  In the above embodiment, the guide ring 5 is made of a synthetic resin, but may be made of a metal such as stainless steel.

  When the fluid pipe 2 is relatively soft, such as vinyl chloride or polyethylene, the lock rings 6, 6 'may be formed of a hard synthetic resin such as an acetal resin or a polyamide resin.

  Next, a second embodiment of the present invention will be described with reference to FIG. The second embodiment is different from the first embodiment only in the structure of the guide ring, and the other configuration is the same. FIG. 10 is a schematic explanatory view of the mounting state of the guide ring and the lock ring. The lock ring 26 is cut off in the circumferential direction to form a broken circle as in the first embodiment. Are composed of a plurality of divided pieces 25a having the same structure.

  Divided pieces 25a of the guide ring 25 are disposed on the outer peripheral side of the fluid pipe. Since the divided pieces 25a can be arranged evenly in the circumferential direction, the diameter of each divided piece 25a is reduced by the action of the pressing ring. In this case, it is possible to reduce the diameter evenly, and even if the guide ring 25 is partially damaged, it is only necessary to replace the broken piece alone.

  Next, a third embodiment of the present invention will be described with reference to FIG. The third embodiment differs from the first embodiment only in the structure of the lock ring, and the other configuration is the same. FIG. 11 is a schematic explanatory view of the mounting state of the guide ring and the lock ring. The guide ring 35 is formed by cutting off a part in the circumferential direction to form a broken circle as in the first embodiment. Are composed of a plurality of divided pieces 36a having the same structure.

  The divided pieces 36a of the lock ring 36 are disposed on the outer peripheral side of the fluid pipe. Since the divided pieces 36a can be arranged evenly in the circumferential direction, each divided piece 36a can be arranged via the guide ring 35 by the action of the pressing ring. When receiving the diameter reducing action, it is possible to perform biting by uniform diameter reduction, and even if some of the blades are damaged, only the divided pieces need to be replaced.

  In addition, as a modified example similar to the second and third embodiments, both the guide ring and the lock ring may be divided and assembled, though not shown.

  The first to third embodiments of the present invention have been described with reference to the drawings. However, the specific configuration is not limited to these embodiments. For example, the guide ring and the lock ring are separately formed and integrally formed. It goes without saying that the guide ring and the lock ring may be formed as an integral molded product as well as the one that is engaged or fitted in a specific manner.

It is a central vertical section front view showing one embodiment of the present invention. It is a side view of a guide ring similarly. It is a side view of a lock ring similarly. It is a fragmentary sectional view at the same time at the time of start of press wheel tightening. It is a fragmentary sectional view in the same way in the middle of press ring tightening. It is a fragmentary sectional view at the time of pressing wheel press completion. FIG. 4 is a partial cross-sectional view when a pull-out force is applied to the fluid pipe. It is a fragmentary sectional view of an embodiment in which a cushion ring is inserted in an annular groove of a guide ring. It is the fragmentary sectional view at the time of completion of press ring tightening which showed the modification of the lock ring stored in a guide ring. FIG. 9 is a schematic explanatory view of a state where a guide ring and a lock ring are mounted in a second embodiment. FIG. 14 is a schematic explanatory view of a state where a guide ring and a lock ring are mounted in a third embodiment.

Explanation of reference numerals

1 Separation prevention device 2 Fluid pipe (other fluid pipe)
3 Fitting body (one fluid pipe)
3a Enlarged diameter portion 3b Flange 4 Press ring 4a Cylindrical guide surface 4b Tapered guide surface 4c Flange 5 Guide ring 5a Tapered surface 6, 6 'Lock ring 7 Packing press ring 7a Packing press-in portion 7b Contact portion 8 Packing 9 Fastening means 10 T-head bolt 11 Cap nut 12 Annular groove 13, 13 'Blade 14 Cushion ring 25, 35 Guide ring 25a Split piece (of guide ring)
26, 36 Lock ring 36a Split piece (of lock ring)

Claims (10)

A fluid pipe detachment prevention device that inserts the insertion port end of the other fluid pipe into the receiving port end of one fluid pipe to prevent the pipes from coming off from each other. The packing to be inserted and the inner peripheral surface on the one fluid pipe side fixed to one of the fluid pipes by fastening means form a cylindrical guide surface having the same inner diameter, and are connected to the outer end inner peripheral face. However, the outer ring has a tapered guide surface whose diameter gradually decreases, and the outer surface abuts against the inner surface of the ring, and the inner side end presses the packing into the enlarged diameter portion. An insertable packing pressing ring and at least the outer peripheral surface on the outer end side form a tapered surface having substantially the same inclination as the tapered guide surface of the pressing ring, and the inside of the pressing ring is formed into the cylindrical guide surface and the tapered guide surface. By sliding and relatively moving outward, A guide ring having an annular groove on an inner peripheral surface that moves in a radial direction; and a guide ring that is housed in the annular groove so as to be movable in a radially-reduced direction, and that can bite into the outer peripheral surface of the other fluid pipe on the inner peripheral surface. And a lock ring having a blade. The detachment prevention device for a fluid pipe according to claim 1, wherein the guide ring is formed in a partially circular shape that can be elastically deformed in a diameter decreasing direction. 2. The device according to claim 1, wherein the guide ring includes a plurality of divided pieces. 4. The device according to claim 1, wherein the lock ring is formed in a partially circular shape that can be elastically deformed in the radial direction. The device according to any one of claims 1 to 3, wherein the lock ring comprises a plurality of divided pieces. 6. The device according to claim 1, wherein the guide ring is formed of a hard synthetic resin having a small frictional resistance. 7. The fluid pipe detachment prevention device according to claim 1, wherein the annular groove of the guide ring has a concave cross section, and the lock ring has a rectangular cross section having substantially the same shape as the annular groove. The detachment prevention device for a fluid pipe according to any one of claims 1 to 7, wherein a dimension of the cylindrical guide surface of the press ring in the pipe axis direction is larger than a required dimension of the tapered surface of the guide ring in the pipe axis direction. 9. The gasket according to claim 1, wherein an outer peripheral portion of the packing pressure ring on one fluid pipe side is provided with a contact portion that regulates a maximum pushing amount of the packing by contacting a side end face of the one pipe. A device for preventing the fluid pipe from falling off. The device according to any one of claims 1 to 9, wherein a cushion ring or a spacer ring is inserted between an inner surface of the guide ring in the annular groove and the lock ring.

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