JP2005331090A - O-ring for joint equipment of water pipe and attaching structure of o-ring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make rotation of a pipe body and a joint member in the periphery direction free, automatically stop the rotation, and secure a water tightness. <P>SOLUTION: An O-ring for a joint equipment of a water pipe is constituted by water expansion rubber. Then the water expansion rubber is formed by mixing main compositions of natural rubber and/or synthetic rubber with high-absorptivity resin, a penetration adjustment agent, a curing agent, a vulcanizing agent or the like, and with an aid selected as appropriate such as a rubber antioxidant, a plasticizer, a reinforcing material, an extender, a filler or the like. The high-absorptivity resin takes water into a molecule, gelatinizes itself and expands, and the penetration adjustment agent makes the penetration of water uniform. Then the curing agent and the vulcanizing agent stabilize a volume expansion coefficient over the long run. Then the O-ring 23, which is included in a joint part of the water pipe, has tension and an expansion coefficient necessary for the water tightness of an insertion engagement hole for the O-ring. An annular groove for insertion engagement of the O-ring 23 included between the pipe body side and the joint member is secured by the spacing between adjacent resin rings, and the resin rings are externally engaged with a step part formed around the periphery of a metal sleeve engaged with the pipe body side. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention makes it possible to freely rotate the pipe body and the joint member in the circumferential direction, and to automatically secure the water tightness while automatically stopping the rotation, and the O-ring for the joint device of the water pipe. Ring mounting structure.

  As is well known, an O-ring is used as a joint component that relatively rotates the joint and the pipe in the circumferential direction (axial direction) and ensures water tightness.

  For example, in the joint structure in Japanese Patent Application Laid-Open No. 2000-310375, as shown in FIG. 5, an O-ring pressure contact surface 2b and a spacing holding surface 2c are formed on the inner periphery of the connection port 2a of the joint 2, A low friction coefficient rubber O-ring 3 is interposed in a pressure contact surface 2b of the joint 2 in a pressure contact state in a valley 1a of the bellows-like flexible tube 1 inserted into the connection port 2a of the joint 2. The split bush 4 that is prevented from coming off keeps the distance between the outer periphery of the flexible tube 1 and the inner periphery of the joint 2 substantially uniform, and prevents the flexible tube 1 from moving in the axial direction. The tube 1 is configured to allow relative rotation around the axis while maintaining a watertight state with an O-ring 3 made of a low friction coefficient rubber.

  This is because, in the bellows-like flexible tube 1 that cannot be manufactured with high dimensional accuracy, when the compression adjustment to the O-ring 3 is performed in order to ensure high water tightness, if the O-ring 3 is subjected to a large compression, its repulsive force Increases, the sliding resistance between the O-ring 3 and the pressure contact surface 2a of the joint 2 increases, the rotational torque increases, and the joint 2 cannot be rotated about the axis with respect to the flexible pipe 1 unless a tool is used. It tries to solve the problem.

  In addition, as shown in FIG. 6, the one disclosed in Japanese Patent Laid-Open No. 2000-310376 is relatively water-tight and the joint 2 and the flexible pipe 1 are relatively moved about the axis between the pressure contact surface 2 b of the O-ring 7. The compression rate of the O-ring 3 of the O-ring 7 is adjusted to be different from each other.

  In addition, as shown in FIG. 7, the one disclosed in Japanese Patent Application Laid-Open No. 2002-228062 pressurizes the O-ring 10 against the bottom of the housing recess 11 at the tube end side portion of the annular projecting portion 9 of the stainless steel tube 8, The base portion on the tube end side of the annular projecting portion 9 is pressed against the corner portion 13 of the joint body 12. Here, the sum of the frictional resistance against the O-ring 10 and the frictional resistance against the corner 13 on the tube end side portion of the annular protrusion 9 is the separation side portion of the sliding member 14 and the tube protrusion on the annular protrusion 9. It is set to be larger than the frictional resistance. Thereby, when the nut 16 is rotated together with the sliding member 14 and the nut 16 is fastened to the joint body 12, the stainless steel pipe 8 is prevented from rotating together.

  However, Japanese Patent Laid-Open No. 2000-310375 and the like are intended to adjust the compression of the O-ring in order to ensure high water tightness, and the compression of the O-ring and its repulsive force must be considered. Moreover, the thing of Unexamined-Japanese-Patent No. 2000-310376 is a compression rate of O-rings in order to ensure water-tightness and to rotate a joint and a flexible pipe | tube relatively around an axis | shaft between the press-contact surfaces of an O-ring. You must prepare something different from each other. Furthermore, the thing of Unexamined-Japanese-Patent No. 2002-228062 pressurizes an O-ring with respect to the bottom part of an accommodation recess in the pipe end side part in the annular protrusion part of a stainless steel pipe, and connects the base part by the side of the pipe end in an annular protrusion part to a joint. In addition to being in pressure contact with the corners of the main body, it is necessary to adjust the frictional resistance.

  As described above, in order to ensure circumferential rotation between the tube body and the joint through the O-ring, the compression rate of the O-ring is set to be small, and the meshing between the tube body and the joint is loose. It is necessary to match. Moreover, in order to ensure the watertightness after construction and prevention of co-rotation, it is necessary to pressurize the pipe body and the joint and press the O-ring strongly to ensure the sealing performance against drainage.

  In any case, the conventional O-ring automatically expands its own volume and does not exert an expansion force toward the outside. Therefore, in order to ensure water tightness, the O-ring is compressed by an external force. Or, the O-ring should be left as it is, and other measures such as adding seal packing to ensure water-tightness and prevention of co-rotation after construction, reducing manufacturing costs and workability during construction. I was not able to plan.

  The present invention has been made in view of the circumstances as described above, and the object of the invention is to automatically inflate the volume of the O-ring in particular and to exert an expansion force outward. Therefore, the O-ring is not compressed by an external force, and the combined accuracy of the tube body, the joint member, and the O-ring is moderately rotated with respect to each other in the circumferential direction. An object of the present invention is to provide a joint device for a water pipe that can ensure sufficient water tightness while automatically stopping the rotation of the joint member.

  In order to confuse the above-mentioned object, the present invention has natural rubber and / or synthetic rubber as a main component of composition as an O-ring for a joint device of a water pipe, and the main component of the composition. In addition to water-absorbing resin that gels and expands by incorporating water into the molecule, a permeation regulator that makes water permeate uniform, a curing agent that stabilizes the volume expansion rate for a long period of time, a vulcanizing agent, etc., as an aid to prevent aging Molded from water-expanded rubber, which is made by appropriately selecting and mixing agents, plasticizers, reinforcing agents, extenders, fillers, etc., and has tension as an O-ring interposed in the joint of the water pipe, It has an expansion rate necessary to make the fitting hole watertight, and when it is installed as a water distribution pipe, the pipe body and the joint member are assembled so as to be freely rotatable in the circumferential direction. The body and joint members are automatically crimped to the pipe And the circumferential rotation of the joint member to the stop state, and, wherein the Assurance of watertightness.

  Further, as described in claim 2, as an O-ring mounting structure, the annular groove for insertion of the O-ring interposed between the tube side and the joint member is an outer periphery of the metal sleeve fitted on the tube side. A resin ring is externally fitted to the step portion formed in the step, and is secured by an interval between the resin rings adjacent to each other.

  According to the first aspect of the present invention, the construction accuracy of the tube body, the joint member, and the O-ring can be moderated at the time of construction so that they can be rotated in the circumferential direction. Therefore, sufficient water tightness can be ensured while automatically stopping the rotation of the tube body and the joint member by its own water expansion force. Therefore, it is possible to significantly reduce the manufacturing cost and to ensure good workability during construction.

  Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an external perspective view showing an O-ring according to the present invention in a joint device for a water distribution pipe.

  As shown in FIG. 2, the attachment structure according to the present invention is attached to an end portion of a stainless steel flexible steel pipe 20 having a bellows portion 20b. A metal sleeve 21 is fitted on the outer periphery on the end side of the tube body 20a. Steps 22 (22a, 22b, 22c, 22d) are formed on the outer peripheral surface of the sleeve 21.

  Specifically, the first step portion 22a drilled on the bellows portion 20b side (left side in the drawing) of the metal sleeve 21, and the second step portion 22b drilled in the central portion (center side in the drawing). The third step portion 22c and the fourth step portion 22d are formed on the opposite side of the bellows portion 20b side (right side in the figure).

  Further, a resin ring 24 or the like is fitted on the step portion 22 formed on the peripheral surface of the metal sleeve 21. Specifically, a first resin ring 24a is inserted into the first step portion 21a so as to fit into the full width of the step portion. A second resin ring 24b is inserted into the second step portion 21b so as to be shorter than the full width of the step portion. A third resin ring 24c is inserted into the third step portion 21c so as to be fitted shorter than the full width of the step portion, and the convex portion is fitted shorter than the full width of the second step portion. It is inserted. A fourth resin ring 24d is engaged with the fourth step portion 21d, and the convex portion is inserted so that it fits shorter than the entire width of the third step portion 21c.

  Therefore, a clearance (annular groove) S is formed by the convex portions of the third resin ring 24c and the fourth resin ring 24d. In this clearance S, an O-ring 23 formed of water expansion rubber is inserted. When two O-rings 23 are arranged, it is preferable that the side on which water enters (the right side in the figure) is formed large and the downstream side is formed small.

  The O-ring 23 is composed mainly of natural rubber and / or synthetic rubber. Along with this composition main component, superabsorbent resin that takes water into the molecule and expands by gelling, a permeation regulator that makes water permeate uniform, a curing agent that stabilizes the volume expansion rate for a long period of time, a vulcanizing agent, It is preferably molded from a water-expanded rubber obtained by appropriately selecting and mixing an antioxidant, a plasticizer, a reinforcing agent, a bulking agent, a filler and the like as an auxiliary agent, and is molded to a hardness of about 70 HS. . If the hardness seems to be less than 70 HS, the rotation cannot be supported as an O-ring, and if the hardness is too high, the expansion coefficient becomes low, and the joint rotation prevention and watertightness in the joint device will be lacking.

  As the synthetic rubber, the rubber material which is the main component of the composition includes styrene butadiene rubber (SBR), isoprene (1R), polyptadiene <BR>, acrylonitrile rubber (NBR), acrylic rubber (ACM), ethylene propylene rubber (EPDM), Examples include chloroprene rubber (CR), fluorine rubber, urethane rubber, acrylic-butadiene rubber (ABR), acrylonitrile-isoprene rubber (NlR), and acrylonitrile-chloroprene rubber (NCR).

  The water-absorbing resin may be any resin that can take water into the molecule and swell and gel, such as isobutylene-maleic anhydride copolymer, polyvinyl alcohol-acrylic acid copolymer, starch derivative, and carboxymethylcellulose derivative. Water-absorbing resin is mentioned.

  Polyalkylene oxide derivatives are polymers or copolymers of alkylene oxides such as polyethylene glycol, polypropylene glycol and ethylene oxide-propylene oxide copolymers, polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether and Examples include polyoxyethylene alkyl ethers such as polyoxyethylene oleyl ether, polyoxyethylene allyl ethers such as polyoxyethylene octylphenyl ether and polyoxyethylene nonylphenyl ether.

  A joint member (a nipple in this embodiment) 26 is rotatably fitted on the outer periphery of the resin ring 24. An annular groove 26a is formed on the inner peripheral surface near the end of the bellows portion 20b. The metal stop ring 25 is inserted into the annular groove 26a, and the movement of the metal sleeve 21 that is externally fitted to the tubular body 20a is restricted by coming into contact with the first resin ring 24a. doing.

  Since the mounting structure according to this embodiment is configured as described above, at the time of piping, the nipple 26 attached to the pipe body 20a is abutted against the mating joint portion and the nipple 26 is rotated and screwed together. At this time, since the O-ring 23 formed of the water-expandable rubber is in an original state before being expanded without containing water, the nipple 26 is rotatable in the circumferential direction. That is, even if the pipe body 20a is in a fixed state, the nipple 26 can be freely rotated in the circumferential direction, and workability at the time of piping construction can be improved.

  Further, after the construction, the joint device is constantly pressurized with, for example, a water pressure of about 1.0 MPa, and water enters the slight gap between the nipple 26 and the resin ring 24. The O-ring 23 expands and changes from the state shown in FIG. 2A to the state shown in FIG. 2B, and is strongly pressed against the inner peripheral surface of the nipple 26 by its own expansion force. In addition to stopping the rotation, water intrusion to the downstream side is prevented and high water tightness is secured. Note that the O-ring arranged on the downstream side fulfills the function of watertightness when water leaks from the upstream O-ring.

  Between the nipple 26 and the tube body 20a and the metal sleeve 21 fitted on the tube body 20a, a resin ring 24 formed in a divided manner is formed at a step portion 22 formed on the peripheral surface of the metal sleeve 21. Since the outer sleeve is fitted to insulate between the metal sleeve 21 and the nipple 26 and the clearance S for inserting the O-ring is formed, it is not necessary to form the annular groove for inserting the O-ring at the time of injection molding. Save time and effort.

  Further, since the O-ring 23 is not a mere rubber material as in the prior art but is made of a water-expandable rubber material, even when the molding accuracy of the O-ring 23 is rough, the water tightness can be reliably improved. Even when the joining accuracy between the nipple 26 and the metal sleeve 21 is rougher than before, the water tightness can be improved.

  Further, each clearance S for insertion of the O-ring 23 does not form an annular groove on the outer periphery of the resin body as in the prior art, but a resin ring at the step 22 on the peripheral surface of the metal sleeve 21. Since it can be formed by externally fitting 24, the manufacturing cost can be further reduced.

  Therefore, the manufacturing cost is reduced, the end of the tube is rotatable during construction to improve the workability of the piping, and after construction, sufficient water tightness is automatically secured and electric corrosion is prevented. It can be set as the joint apparatus for water pipes with which it was planned.

  FIG. 3 shows a second embodiment in which two O-rings 23 are arranged. In this case, since the outer peripheral surface of the sleeve 21 and the nipple 26 are supported at two points by the O-rings 23 and 23, more stable rotation support and stop holding can be performed. Further, the downstream O-ring 23 can be an auxiliary watertight body.

  As described above, according to each embodiment, even if the combination accuracy of the tubular body, the joint member, and the O-ring is made moderate and can be rotated in the circumferential direction, the pipe can be rotated by the water expansion force of the O-ring after construction. Sufficient water-tightness can be ensured while automatically stopping the rotation of the body and the joint member, so that the production cost can be significantly reduced and good workability during construction can be ensured.

It is an external appearance perspective view which shows the O-ring which concerns on this invention. It is sectional drawing for description which shows one Example of the coupling apparatus to which the O-ring of FIG. 1 is applied. It is explanatory drawing which shows the ring state of an O-ring. It is sectional drawing for description which shows one Example of the coupling apparatus which concerns on this invention. It is sectional drawing for description which shows an example of the conventional coupling device. It is sectional drawing for description which shows two examples of the conventional coupling device. It is sectional drawing for description which shows two examples of the conventional coupling device.

Brief description of symbols

20 Tubular body 20a Bellows part 20b Straight pipe part 21 Metal sleeve 22 Metal sleeve step part 23 Water expansion rubber O-ring 24 Resin ring 25 Metal stop ring 26 Joint member

Claims (2)

The O-ring for a joint device of a water pipe and the mounting structure of the O-ring In order to defeat the above-mentioned object, the present invention is as described in claim 1 as an O-ring for a joint device of a water pipe. Natural rubber and / or synthetic rubber as the main component of the composition, water-absorbing resin that gels and expands by incorporating water into the main component of this component, a permeation regulator that makes water permeate uniform, and a long-term expansion coefficient It is molded from water-expanded rubber, which is made by mixing appropriately selected anti-aging agents, plasticizers, reinforcing agents, extenders, fillers, etc. as auxiliary agents together with curing agents, vulcanizing agents, and the like for stabilization. It has tension as an O-ring interposed in the joint and has an expansion coefficient necessary to make the O-ring insertion hole watertight, and the pipe body and joint member can be freely rotated in the circumferential direction during construction as a water distribution pipe. After water expansion during construction The water distribution pipe is characterized in that the pipe body and the joint member are automatically crimped by its own water expansion to stop the circumferential rotation of the pipe body and the joint member and to ensure water tightness. O-rings for joint devices.   An annular groove for insertion of an O-ring interposed between the tube side and the joint member is formed by externally fitting a resin ring on a step formed on the outer periphery of a metal sleeve fitted on the tube side. Mounting structure of O-ring for joint device of water pipe characterized by being secured by the interval between the resin rings

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