JP4370219B2 - Flexible fitting packing - Google Patents

Description

  The present invention is used for a pipe joint for connecting pipe bodies such as a drain pipe of a building, and relates to a packing formed by an elastic material because it is interposed between the outer surface of the pipe body and the inner face of the joint portion. It is.

  Among packings used for flexible pipe joints applied to drainage steel pipes and the like, there is one in which a rigid sphere is disposed in the packing body to enhance the pull-out resistance (No. 3099370). In this type of joint, the pull-out resistance is excellent, but when the pressure applied to the joint is made higher than before, there is a problem in that the speed of progress of the pipe removal is increased.

  In addition, this type of pipe joint is used for drainage pipes for sewage and miscellaneous drainage in buildings, and it is possible to cope with the flexibility of building vibration due to earthquakes, etc., and the absorbability of expansion and contraction due to heat of pipes. Although it has flexibility, the conventional type joint does not necessarily have sufficient follow-up performance with respect to fluctuations in the pipe. For example, there is a problem that the packing main body is compressed by the tightening of the joint portion and becomes wrinkled, which causes a decrease in watertightness or an insufficient action against the pulling force of the pipe.

Noto 3099370

  The present invention has been made by paying attention to the above points, and the problem is that the adhesion to the tube body is improved, the water tightness is maintained, and the performance of preventing the tube body from being pulled out is improved. It is to provide a flexible joint packing.

In order to solve the above-described problems, the present invention is used for a pipe joint for connecting a pipe body such as a drain pipe of a building, and is interposed between the outer surface of the pipe body and the inner face of the joint portion, so that it is elastic. An annular portion that can be fitted to the outer surface of the tubular body, one end portion that extends in the tube axis direction from one end of the annular portion, and another end portion that extends in the tube axis direction from the other end of the annular portion. The packing body has an inner slope and a pipe provided in the joint portion when the joint portion is fastened by a bolt , and is divided into a plurality of portions by slits so that one end portion of the packing body can move independently. Means are provided in which one or two or more rigid spheres interposed between the outer surface and the outer surface of the body are provided in each of the divided portions .

  The packing according to the present invention is used by being interposed between the outer surface of the tubular body and the inner surface of the joint portion, and is formed of an elastic material in order to exhibit watertight performance. Therefore, an elastic material such as a synthetic resin material such as nitrile rubber (NBR) is suitable for the packing. Natural rubber-based elastic materials may also be used for the packing. It is assumed that the pipe body is made of steel pipe and the joint portion is made of cast iron products such as gray cast iron (FC) and ductile cast iron (FCD), but is not limited thereto.

  The packing according to the present invention includes a packing main body, and the packing main body includes an annular portion, one end portion extending from one end of the annular portion in the tube axis direction, and the other end portion extending from the other end of the annular portion in the tube axis direction. Have. The annular portion can be fitted to the outer surface of the tubular body, is a main portion that exhibits a water stop effect as a packing, and is a portion that is compressed by the joint portion. The packing body has both end portions of the annular portion as one end portion and the other end portion, respectively.

  The rigid sphere is interposed between the inner slope of the joint portion and the outer surface of the tube, and is provided at one end portion of the packing body. The rigid sphere is fixed to the packing body, and a part of the rigid sphere protrudes outward and inward from the packing body. Therefore, the rigid sphere has a structure capable of contacting the inner slope of the joint and the outer surface of the tube. Note that the rigid sphere is assumed to be made of metal, and a part of the rigid sphere is either exposed from one end portion of the packing body or covered with an elastic material of the packing body.

  A plurality of such rigid spheres are provided in the circumferential direction of one end portion of the packing body, and are also divided by slits so that the one end portion can move independently. In other words, one end portion of the packing body is divided into a plurality of portions by slits, and a rigid sphere is provided in each divided portion. The number of divided parts and the number of hard spheres match (one rigid sphere per divided part), or the number of rigid spheres is a multiple of the divided part (two or three rigid spheres per divided part) Or more). The rigid sphere is preferably fixed so as not to move on the packing body.

  The packing main body can be brought into surface contact with the outer surface of the tube body, and a fold portion inclined toward the other end portion can be provided on the inner peripheral surface. The pleat portion opposes the pulling force acting on the tube body by making surface contact with the outer surface of the tube body, and for that purpose, the fold portion is inclined toward the other end portion on the inner peripheral surface of the annular portion. Therefore, when the fold portion is going to move toward the one end portion, the fold portion has to be turned over, and when it is turned over, it works to prevent pulling out by biting into the annular portion.

  It is desirable that the packing main body has a locking end portion that locks the end portion of the tubular body at the other end portion. The locking end covers the end of the tube and exhibits an anticorrosive action. The tube and the joint are not brought into contact with each other, so that no contact noise is generated, and no resin filling is required to secure a gap. To maintain flexibility.

  Since the present invention is configured and operates as described above, the adhesion to the pipe body is improved, and even if the joint portion is tightened, the packing body is not deformed as wrinkled, and is watertight. In addition, there is an effect that the pull-out preventing force with respect to the tubular body can be improved by the fold portion.

  Embodiments of the flexible joint packing according to the present invention will be described below with reference to the illustrated embodiments. In each figure, 11 is a pipe body, and 12 is a joint pipe. The joint pipe 12 has a central portion 13 having the same diameter as the inner diameter of the pipe body, and flange portions 14, 14 'at both ends. A joint ring 15 is combined with the flange portions 14, 14 '. Bolt holes are provided in the flange portions 14, 14 ′ and the joint ring 15, and the bolt 16 can be inserted and tightened together with the nut 17. The joint pipe 12 and the joint ring 15 constitute a joint portion 18 in the present invention. A packing arrangement portion for attaching the packing according to the present invention is provided on the inner circumference of the joint portion 18, and the inner circumference of the joint ring 15 is tapered toward the outer side of the joint portion 18 as an inner slope 19. A slope is provided. Note that the nut 17 is not essential because a female screw can be provided in the bolt hole of the joint ring 15 and used instead.

The packing body 20 includes an annular portion 21 that can be fitted to the outer surface of the tubular body 11, an end portion 22 that extends from one end of the annular portion 21 in the tube axis direction, and another end that extends from the other end of the annular portion 21 in the tube axis direction. It consists of a portion 23 and is provided with a hard sphere 25 or the like. As shown in FIG. 2, twelve rigid spheres 25 are attached to one end portion 22 of the packing body 20 at equal intervals in the circumferential direction, and each rigid sphere 25 has one end portion 22 having a tapered cross section. Since it has a larger diameter than the mounting portion, both the inner surface side and the outer surface side are exposed, and can contact the outer surface of the tube 11 and the inner slope 19 of the joint ring 15. One end portion 22 provided with each rigid sphere 25 is divided into one by a slit 26. The illustrated slit 26 is formed in a reverse taper shape, and adjacent one end portions are completely separated from each other by a space portion 27 corresponding to the bottom of the slit, and the generation of compression wrinkles in the packing body 20 is prevented. It is intended to improve the follow-up performance with respect to position fluctuations.

  The packing body 20 also has a fold portion 28 on the inner peripheral surface of the annular portion 21. As shown in FIG. 5, the one in FIG. 1 is provided with a fold portion 28 that can be brought into surface contact with the outer surface of the tube body 11 and inclined toward the other end portion 23 of the annular portion 21 in the tube axis direction. This is an example in which two are provided, and the effect is exerted in two stages. FIG. 6 shows an example in which three fold portions 28 are provided, and these indicate that the number of fold portions 28 is not limited. Of course, one piece may be sufficient.

  The other end portion of the packing body 20 is provided with a locking end portion 29 that locks the end of the tube body 11 so as to cover it. The locking end portion 29 is located at the tip of the other end portion 23 of the annular portion 21, and the other end portion 23 has a thin film shape so that it has good stretchability. It does not prevent them from being placed at their intended positions. The annular portion 21 of the packing body 20 has a substantially trapezoidal cross-sectional shape with a thickness that fills the space between the tubular body 11 and the joint portion 18 and exhibits water tightness (see FIGS. 5 and 6). .

In order to construct the flexible pipe joint 30 using the packing of the present invention having such a configuration, the joint ring 15 is fitted into the pipe body 11 in advance, and then the packing body 20 is fitted into the pipe body 11 in the same manner. . At that time, care is taken to ensure that the locking end portion 29 covers the end portion of the tube body 11 so that the one end portion 22 of the packing body 20 enters between the inner inclined surface 19 of the joint ring 15 and the outer surface of the tube body. To do. Further, it is fitted into the joint pipe 12 so as to cover the outer side of the packing body 20, and the bolt 16 is inserted into the bolt hole of the flange portion 14 and the joint ring 15, and the nut 17 is screwed to perform the fastening operation.

  By tightening the bolt 16 and the nut 17, the one end portion 22 of the packing is pushed into the joint ring 15, so that the rigid sphere 25 is pressed against the outer surface of the tubular body 11 by the inner slope 19 (see FIG. 1). In such a fastened state, the annular portion 21 of the packing body 20 sandwiched between the joint ring 15 and the flange 14 is also deformed. Since the compression deformation is also absorbed by the slit 26 in the annular portion 21 that is compressed by tightening the bolt 16 and the nut 17, it does not become wrinkled, and a watertight joint is completed here. Further, even if the joint pipe 12 and the pipe body 11 undergo relative movement that deviates from the pipe axis direction, the compression and extension are adjusted by the slit 26, and the desired watertightness is maintained. Furthermore, when the relative movement is in the direction of the tube axis, the fold portion 28 that is in pressure contact with the outer surface of the tube body resists the pull-out against the pull-out, and the locking end portion 29 is located between It acts to prevent the end of the tube from hitting.

The longitudinal cross-sectional view which shows the Example of the packing for flexible pipe joints which concerns on this invention. The end view of the one end part side of a packing similarly. The side view of packing similarly. The end view of the other end part side of packing similarly. VV sectional view taken on the line of FIG. Sectional drawing similar to FIG. 5 which shows the modification of a pleat.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Tube 12 Joint pipe 14, 14 'Flange part 15 Joint ring 16 Bolt 18 Joint part 19 Inner slope 20 Packing main body 21 Annular part 22 One end part 23 Other end part 25 Rigid sphere 26 Slit 28 Hidden part

Claims (1)

It is used for pipe joints that connect pipe bodies such as building drainage pipes, and is a packing formed of an elastic material for interposing between the outer surface of the pipe body and the inner surface of the joint section. of the annular portion fittable on the outer surface, comprising one end portion extending from one end of the annular portion to the tube axis direction, a packing body having a second end portion extending from the other end of the annular portion to the tube axis direction, the packing body A rigid sphere that is divided into a plurality of parts by slits so that one end part of the joint can move independently, and is interposed between the inner slope provided on the joint and the outer surface of the pipe when the joint is fastened by a bolt Is a flexible pipe joint packing having a structure in which one or two or more are provided in each of the divided parts .

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