JP2005325989A - Water piping joint device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water piping joint device having high sealing accuracy after constructed of gentle manufacturing accuracy by making a pipe body and a joint member freely rotatable in the peripheral direction and automatically putting them into a rotation stopped condition to secure water tightness. <P>SOLUTION: The pipe body 20 and the joint member 26 are gently combined and assembled together rotatably in the peripheral direction with a water-expanded rubber O-ring 23 laid between both members. After the O-ring 23 is water-expanded, the pipe body 20 and the joint member 26 are subjected to press bonding with the expanding force of the O-ring 23. Thereby, both members are automatically put into the rotation stoppage condition to secure watertightness. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  This invention makes it possible to freely rotate the pipe body and the joint member in the circumferential direction, and to automatically stop the rotation so as to ensure watertightness. The present invention relates to a joint device for a water pipe that can ensure a high sealing accuracy later.

  JP, 2000-310375, A, etc. are proposed as a joint structure which rotates a joint and piping relatively in the peripheral direction (axis rotation direction), and ensures watertightness, for example.

  As shown in FIG. 4, this joint structure is formed with an O-ring pressure contact surface 2b and a spacing holding surface 2c on the inner periphery of the connection port 2a of the joint 2, and is inserted into the connection port 2a of the joint 2. In the valley portion 1a of the bellows-like flexible tube 1, an O-ring 3 of low friction coefficient rubber is interposed in a pressure contact surface 2b of the joint 2 in a pressure contact state. 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. 5, the one disclosed in Japanese Patent Application Laid-Open No. 2000-310376 is relatively water-tight, and the joint 2 and the flexible pipe 1 are relative to each other around the axis between the pressure contact surface 2 b of the O-ring 7. The compression ratios of the O-ring 7 and the O-ring 3 are adjusted to be different from each other.

  In addition, as shown in FIG. 6, 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 friction resistance with respect to the O-ring 10 on the tube end side portion of the annular protrusion 9 and the friction resistance with respect to the corner portion 13 is the separation side of the engagement surface 15 of the sliding member 14 and the tube surface in the annular protrusion 9. It is set to be larger than the frictional resistance with the part. Thereby, the nut 16 is rotated together with the sliding member 14, and when the nut 16 is fastened to the joint main body 12, the stainless copper 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. In addition, in JP 2000-310376 A, since water tightness is ensured and the joint and the flexible pipe are relatively rotated around the axis between the pressure contact surface of the O ring, compression between the O rings is performed. You have to prepare things with different rates. 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 the rotation in the circumferential direction through the O-ring between the tubular body and the joint, the compression rate of the O-ring is set to be small, and the meshing between the tubular body and the joint is loose. It is necessary to mesh. Also, in order to ensure watertightness after construction and prevention of co-rotation, it is necessary to set the combination of the pipe body and the joint with high accuracy, and pressurize the pipe body and the joint to strengthen the O-ring. It must be pressed to ensure sealing performance against drainage.

  In any case, conventionally, it is necessary to compress the O-ring or to keep the O-ring as it is, and to ensure water-tightness after construction and prevention of co-rotation by other means such as an additional seal packing. Moreover, the combination of a pipe body and a joint must be set with high accuracy.

  The rotatable combination of the tube body and the joint needs to be in a loosely engaged state between the tube body and the joint, but the loosely engaged state between the tube body and the joint is contrary to ensuring the sealing performance. In the past, it was impossible to secure both at the same time.

  The present invention has been made in view of the circumstances as described above, and an object of the present invention is to moderately match the combination accuracy of the pipe body, the joint member, and the O-ring, thereby reducing the manufacturing cost. In addition, smooth rotation in the circumferential direction between the pipe body and the joint member is possible, and after construction, the rotation of the pipe body and the joint member is automatically stopped by the water expansion force of the O-ring, and sufficient water tightness is achieved. An object of the present invention is to provide a joint device for a water pipe that can secure the properties.

  According to the present invention, in order to confuse the above object, as described in claim 1, a tubular body and a coupling member are gently combined, and an O-ring made of water expansion rubber is interposed between the two members. The two members are assembled so as to be rotatable in the circumferential direction with the O-ring interposed therebetween. After the water expansion of the O-ring, the tubular body and the joint member are pressure-bonded by the expansion force of the O-ring, and the two members are automatically rotated. It is a stop state, and water-tightness between the two members is ensured.

  As an effect of the present invention, at the time of manufacture, the combination accuracy of the tube body, the joint member, and the O-ring can be rotated in the circumferential direction while relaxing, and after the construction, the tube body and the joint member can be rotated by the water expansion force of the O-ring. Sufficient water-tightness can be ensured while automatically stopping rotation, so that the manufacturing cost can be significantly reduced and good workability can be ensured.

  Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory sectional view showing a joint device according to the present invention.

  As shown in FIG. 1, the joint device 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. On the outer peripheral surface of the sleeve 21, step portions 22 (22a, 22b, 22c, 22d) are formed.

  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 22a so as to fit into the full width of the step portion. A second resin ring 24b is inserted into the second step portion 22b so as to be shorter than the full width of the step portion. The third resin ring 24c is inserted into the third step portion 22c 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 22b. Is inserted. A fourth resin ring 24c is engaged with the fourth step portion 22d, and the convex portion is inserted and fitted so as to be shorter than the entire width of the third step portion 22c.

  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, a water expansion rubber O-ring 23 is inserted.

  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 in the vicinity of the end portion on the bellows portion 20b side, and a metal stop ring 25 is inserted into the annular groove 26a and comes into contact with the first resin ring 24a. This restricts the movement of the metal sleeve 21 fitted on the tubular body 20a.

  Since the joint device according to this embodiment is configured as described above, during piping, the nipple 26 attached to the pipe body 20a is abutted against the mating joint (not shown), and the nipple 26 is rotated to be screwed together. To do. At this time, the O-ring 23 formed of the water expansion rubber does not contain water and is in an original state before being expanded, so that 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.

  In addition, after the construction, the joint device is constantly pressurized with a water pressure of about 1.0 MPa, for example, and water enters a slight gap (clearance S) between the nipple 26 and the resin ring 24. It becomes. The O-ring 23 in contact with the water automatically expands by water, and changes from the state shown in FIG. 2A to the state shown in FIG. 2B. The inner peripheral surface of the nipple 26 is strongly pressure-bonded to stop the rotation of the sleeve 21 and the nipple 26, and the clearance S is sealed to prevent water from entering the downstream side and ensure high water tightness. .

  For this reason, at the time of manufacture, the combination of the tube body 20a side and the nipple 26 side should ensure sufficient watertightness after construction even when combined with moderate accuracy instead of being combined with high accuracy as in the past. Will be able to.

  In addition, between the nipple 26 and the tube body 20a and the metal sleeve 21 fitted on the tube body 20a, an annular groove is not formed in the outer periphery of the resin body as in the prior art. A split resin ring 24 is externally fitted to the step 22 formed on the peripheral surface to insulate between the metal sleeve 21 and the nipple 26 and to form a clearance S for inserting an O-ring. Therefore, the manufacturing cost at the time of injection molding is reduced.

  Further, since the O-ring 23 is not a simple 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, it is possible to reliably improve the water tightness. Moreover, even when the joining accuracy between the nipple 26 and the metal sleeve 21 is rougher than before, the water tightness can be improved.

  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, which can further ensure safety.

  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 manufacturing cost can be significantly reduced and good workability can be ensured.

It is sectional drawing for description which shows one Example of the coupling apparatus which concerns on this invention. It is explanatory drawing which shows the fitting 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 portion 20b Straight pipe portion 21 Metal sleeve 22 Metal sleeve step portion 23 Water-swelling rubber O-ring 24 Resin ring 25 Metal stop ring 26 Joint member

Claims (1)

In addition to gently combining the pipe body and the joint member, the O-ring made of water-expandable rubber is interposed between the two members, and the two members are assembled to be freely rotatable in the circumferential direction. The pipe body and the joint member are pressure-bonded by the expansion force of the O-ring, both the members are automatically stopped, and water-tightness between the two members is ensured. Fitting device.

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