JP2005207548A - Synthetic resin spherical flexible pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the stay of filth in a synthetic resin spherical flexible pipe joint. <P>SOLUTION: The flexible pipe joint 1 comprises a spherical outside shell 5 formed integrally with a connection port 4 and a spherical inside shell 3 located on the opposite side and formed integrally with the other connection port 2 having the same linear pipe axis (a). A driven ring 12 is overlapped and put in slide contact with a pair of guide rings 10, 11 which are fixed to the shells 3, 5 at their bases and opposed thereto in disagreement, to form a debris stay preventing flexible ring 9. The flexible ring 9 has a pipe diameter, the same as that of each of the connection ports 2, 4, therefore preventing the stay of filth and avoiding the constriction of a pipe duct when freely changed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a universal pipe joint having a partial spherical surface as a sliding surface (hereinafter also referred to as a spherical universal pipe joint).

  Generally, a universal pipe joint is used for connecting synthetic resin pipes, that is, PVC pipes, or connecting a PVC pipe and a synthetic resin drainage pipe, that is, a PVC pipe.

  This universal joint is roughly divided into a spherical universal pipe joint similar to a ball joint (see Japanese Utility Model Publication No. 63-24484) and an oblique flange so that the connection angle between the two PVC pipes is flexible. And so-called flange-type universal pipe joints (see, for example, Japanese Utility Model Publication No. 57-34391, Japanese Utility Model Publication No. 6-80092, etc.) are known.

  The advantages and disadvantages of these universal pipe joints are as follows.

  In the former, the connection angle and directionality can be adjusted at the same time, but since a partial spherical surface, that is, a donut-shaped spherical surface is used, a large connection angle cannot be obtained. A large reservoir portion is formed.

  On the other hand, the latter has a large connection angle, but cannot adjust the connection angle and the direction at the same time.

  Therefore, the present applicant provides both of these universal pipe joints (Aron Kasei CUHSL universal joints for the former and SR-V universal joints for the latter) so that both needs can be satisfied. ing.

  By the way, various solutions have been proposed for the problem of the reservoir in the spherical universal pipe joint, that is, the waste reservoir.

  For example, the parallel pipe shafts of the blow-molded shell and the outlet formed integrally therewith are provided with a level difference, that is, the shell pipe shaft is placed above the pipe shaft of the outlet to eliminate the accumulation of dirt. (See Japanese Utility Model Laid-Open No. 63-24484 and Japanese Patent Laid-Open No. 9-189042) and those obtained by obliquely intersecting these tube axes (see Japanese Patent Laid-Open No. 11-324094). Yes.

  However, in these conventional spherical universal pipe joints, there is a step or refraction at the bottom of the pipe that is used before being freely changed. For example, these spherical universal pipe joints are used only for adjusting the connection angle and directionality. Since it may be used for measures against piping errors and so-called Jigoku piping work instead of using it, there may be cases where there is no step or refraction after completion of piping, and cleaning from the downstream side may be desirable. In some cases, it is not preferable to insert a tool or the like.

  Therefore, the present invention changes the way of thinking and stops a thick core fitted into a commonly used shell, and provides a universal pipe joint that does not have such inconvenience. The purpose is to make it easier.

  For this purpose, the gist of the present invention is as follows. 1) In a synthetic resin spherical universal pipe joint having a partial spherical surface as a sliding surface, the partial spherical surface is formed by a shell, and a plurality of the spherical surfaces are formed on the base side of the shell. A spherical plastic joint made of synthetic resin, which is provided with a flat inner surface-preserving flexible body constituted by sliding the ring of the inner ring, and 2) before the spherical universal pipe joint is freely changed. Then, the tube axis is in the synthetic resin universal pipe joint according to claim 1, wherein the pipe shafts are collinear, and 3) the flexible bodies are fixed to the shell side and face each other. 3. A synthetic resin spherical universal pipe joint according to claim 1 or 2 comprising a pair of guide rings and a driven ring slidingly contacting them, and 4) dividing the outer or inner shell into the inner Or claim 1 for facilitating assembly of the outer shell. 3 is a synthetic resin spherical universal fittings each described.

  According to the present invention, since the inner surface of the shell is provided with a flat inner ring-shaped flexible ring for preventing stagnation, it is possible to prevent stagnation at any of the freely changing positions, and the pipe line is not narrowed. If not, the tube axis can be made straight, thereby eliminating the above-mentioned problems, and diversifying the use of universal pipe joints, in particular, having both functions of spherical and flange-type universal pipe joints. Can be a thing.

  The present invention will be described in more detail with reference to first, second and third embodiments shown in the accompanying drawings.

  1 is a cross-sectional view of the first embodiment of the present invention, FIG. 2 is a view of the use state of FIG. 1, FIGS. 3 and 4 are exploded cross-sectional views of FIG. 1, and FIG. FIG. 6 is a cross-sectional view of the third embodiment.

  An embodiment of the present invention is a pipe joint for connecting PVC pipes to each other, a PVC pipe and a PVC pipe, a spherical outer shell formed integrally with a connection port, and the opposite side, the same linear shape. In a universal pipe joint that consists of a spherical inner shell that is integrally formed with another connection port having a tube axis or a main body port, and that slidably fits these shells, Specifically, in the above-mentioned universal pipe joint, a flexible ring for preventing accumulation of filth that is fixed (integrally formed or adhesively bonded) on each base side of these two shells and is opposed to each other, and is in a bowl-like shape and is in contact with polymerization. The present invention relates to a universal pipe joint provided with a flexible body for preventing accumulation of flat filth that follows the shell sliding.

  Incidentally, the dimensions are such that the nominal diameter of the connection port is 75 mmφ, 100 mmφ150 mmφ, and 200 mmφ, and the swing angle (maximum connection angle or deflection angle) is 15 ° or more on one side.

  Now, in the universal pipe joint 1 according to the first embodiment of the present invention, in FIGS. 1, 2, 3 and 4, the pipe axis a before being freely changed is the same straight line, and the pipe axis The connection port which is one outflow port having a as the tube axis is a differential port 2.

  Further, the partially spherical inner shell 3 having the tube axis a as the tube axis and the opening 2 are formed integrally.

  Further, the connection port which is the other inflow port having the tube axis a as the tube axis is a rubber ring receiving port 4.

  Further, the partially spherical outer shell 5 having the tube axis a as the tube axis and the rubber ring receiving port 4 are integrally formed.

  Out of these partial spherical surfaces, the outer shells 3 and 5 are fitted in a liquid-tight manner so as to slide freely.

  For the liquid tightness, a seal mounting groove 7 for accommodating the rubber ring 6 is provided in the vicinity of the maximum diameter of the inner shell 3.

  The rubber ring 6, that is, the seal packing, has a size that slightly protrudes outside the seal mounting groove 7, so that the seal property can be reliably maintained and the angle before use can be maintained. .

  For this reason, the inner shell 3 is formed to be slightly thicker than the outer shell (possible because of injection molding), thereby giving rigidity and pressing force to the rubber ring 6.

  The rubber ring receiving port 4 is composed of a normal, for example, standardized rubber ring receiving port, and a stopper 8 for a seal with a lip (18, see FIG. 5) or an inserted PVC pipe (not shown). Is provided.

  Here, a filth accumulation preventing flexible ring (hereinafter also simply referred to as a flexible ring) which is opposed to each other inside the base portions of the inner and outer shells 3 and 5 and is superposed in a bowl shape and is in sliding contact. ) 9 is provided.

  That is, an outer guide ring 10 that constitutes the flexible ring 9 is integrally protruded at or near the base of the inner shell 3.

  Further, an inner guide ring 11 constituting the flexible ring 9 is integrally projected from the base of the outer shell 5 or in the vicinity thereof.

  Each of the guide ring 10 and the guide ring 11 has a hook shape at each end, and a driven ring 12 constituting the flexible ring 9 is interposed therebetween.

  Therefore, the inner peripheral surface of the flexible ring 9 has substantially the same pipe diameter as the connection port of the differential port 2 and the rubber ring receiving port 4 and, like the normal inner surface of the tubular body, is a flat inner peripheral surface. Is configured.

  Therefore, when the universal pipe joint 1 is used by being freely changed, that is, as shown in FIG. 2, the pipe shaft a is placed at about 15 ° on one side at the maximum diameter of the inner shell 3 (in the vicinity of mounting of the rubber ring 6). When bent, the inner and outer shells 3 and 5 slide smoothly, but the flexible ring 9 has a smaller diameter than the radius of the shells 3 and 5, that is, the sliding stroke is reduced. While the driven ring 12 is inclined from the orthogonal state with respect to the tube axis a, it follows this free change. In particular, the flexible ring 9 can be easily followed by deformation of parts.

  That is, the inner and outer shells 3 and 5 are smooth free guide members, and the flexible ring 9 is a flow smoothing member.

  That is, on the inner surface of the guide ring 10, in particular, as shown in FIGS. 3 and 4, a first partial spherical surface 13 having a radius larger than the radius of curvature of the shell is formed from the tip to the base. 11, the second partial spherical surface 14 is formed from the tip to the base portion, and the driven ring 12 is in sliding contact with the first partial spherical surface 13 and the second partial spherical surface 14. Only 13A and 14A are configured.

  Therefore, the driven ring 12 is a belt-like ring having the same diameter as the connection port. Therefore, when viewed in a longitudinal section passing through the top of the pipe while keeping the flow area unchanged and smoothing the flow, there are two places. The rotation center axis is formed. At this time, the maximum deflection angle of the outer shell 5 is about 15 °, but the maximum deflection angle of each bendable portion of the inner driven ring 12 is 7.5 °.

  In particular, the inner surface 15 having a circular arc surface that is in sliding contact with the first partial spherical surface 13 of the driven ring 12 is constituted by a substantially pipe inner surface having a nominal diameter of the polyvinyl chloride pipe, and its tip is wedge-shaped to prevent accumulation of dirt and solid. Prevents mooring of things.

  Further, the front end of the guide ring 11 is also wedged to prevent filth accumulation and to prevent the solid matter from being moored.

  Of course, if the inner and outer guide rings 11, 10 are made shorter in the tube axis direction, a plurality of short driven rings having the same configuration as described above will be provided side by side.

  Further, as the rotation center axis is increased, each maximum deflection angle of the inner driven ring may be smaller, so that further accumulation of dirt can be further prevented.

  In the universal pipe joint 1 having the basic configuration described above, the outer shells 3 and 5 may be assembled by, for example, heating and softening the outer shell 5 and mounting the inner shell 3. Do as follows.

  The shell 5a on the outer side of the universal pipe joint 1a of the second embodiment of the present invention shown in FIG. 5 is connected to the shell body 16 and the cover ring 17 in the vicinity of the maximum diameter, that is, at the seal mounting groove 7a. Divide into

  The cover ring 17 is formed on the outer wall of the seal mounting groove 7a.

  Therefore, after the cover ring 17 with the rubber ring 6 attached is fitted on the inner shell 3a side in advance, the shell main body 16 is fitted on the inner shell 3a, and then the cover ring 17 is attached to the shell main body 16. When press-fitted and meshed, the outer shell 5a is assembled to the inner shell 3a. In this way, the partial spherical surface can be made larger, and as a result, the connection angle can be increased (15 ° or more on one side).

  Other structures are the same as those in FIG. Reference numeral 18 denotes a seal with a lip. Of course, the outer shell 5a may be divided and bonded after being assembled.

  Furthermore, the universal pipe joint 1 having the basic configuration shown in FIG. 1 can be assembled as follows.

  In FIG. 6, in the universal pipe joint 1 b of the third embodiment of the present invention, the pipe axis a before being freely changed is the same straight line, and is one outlet having the pipe axis a as the pipe axis. The connection port is a port 2.

  Further, the inner spherical shell 3b having the tube axis a as the tube axis and the gap 2 are integrally formed.

  Further, the connection port which is the other inflow port having the tube axis a as the tube axis is a rubber ring receiving port 4.

  Further, the partially spherical outer shell 5b bulged by blow molding, with the tube shaft a as the tube shaft, and the rubber ring receiving port 4 are integrally formed.

  Out of these partial spherical surfaces, the outer shells 3b and 5b are fitted in a liquid-tight manner so that the connection angle and direction can be freely slid.

  For this fitting and liquid tightness, the inner shell 3b is divided into a slightly thick shell body 20 having a partially spherical outer surface and an inner shell ring 21 having a partially spherical outer surface. It is assembled and integrated to form the inner shell 3b as a whole.

  A seal mounting groove 7b for mounting the packing 6b is provided in the vicinity of the maximum diameter of the inner shell ring 21. The packing 6b is used to make it liquid-tight.

  Further, inside the base portions of the inner and outer shells 3b and 5b, there is provided a filth accumulation preventing flexible ring 9b which is opposed to each other and slidably contacts in a bowl shape.

  That is, the shell main body 20 constituting each part of the inner shell 3b and the flexible ring 9b, and the guide ring 22 protruding from the inner side of the base of the outer shell 5b and constituting the flexible ring 9b are opposed to each other. In addition, a driven ring 12b, which is fixed in a bowl shape and constitutes a flexible ring 9b, is interposed between the shell body 20 and the guide ring 22.

  That is, the first partial spherical surface 23 having a diameter larger than the radius of curvature of the shell sliding surface is formed on the inner surface of the inner shell body 20, and the first partial spherical surface 23 is formed on the outer surface of the guide ring 22 from the tip to the base. A second partial spherical surface 24 having the same radius is formed, and the driven ring 12b is formed by only the outer spherical surfaces 23b and 24b in sliding contact with the first partial spherical surface 23 and the second partial spherical surface 24. Therefore, the driven ring 12b is a belt-like ring.

  A stopper 8 is formed on the guide ring 22 as a separate part, and is protruded from the base of the outer shell 5b by adhesive bonding.

  Further, the inner shell ring 21 is provided with a plurality of ribs 25 in the tube axis direction to give rigidity, thereby facilitating injection molding.

  Therefore, the outer shells 3b and 5b and the flexible ring 9b are assembled as follows.

  First, the driven ring 12b is fitted inside the shell body 20 on the inner side. On the other hand, the inner shell 21 fitted with the packing 6b is fitted into the outer shell 5b that is horizontal in the tube axis so that the tube shaft is in an orthogonal state in plan view, and then this orthogonality is returned in the outer shell 5b.

  Next, the guide ring 22 is bonded and integrated to the inner surface of the base portion of the outer shell 5b, and the inner shell ring 21 is engaged with the inner shell body 20 by the projections and recesses 26 and bonded. At that time, the guide ring 22 is in sliding contact with the driven ring 12b.

  If the universal pipe joint 1b assembled as described above is freely changed, that is, if the pipe shaft a is bent by 15 ° on one side, the inner and outer shells 3b and 5b slide smoothly.

  On the other hand, since the flexible ring 9b has two rotation center axes, the maximum sliding stroke is halved from these shells 3b and 5b, and the driven ring 12b is orthogonal to the tube axis a. Inclined from the top, it will follow any free change with good response.

  Therefore, according to the universal pipe joint 1b of the third embodiment, the filth accumulation can be eliminated by the flexible ring 9b even if it is freely changed, and a plurality of the shell body 20, the driven ring 12b, and the guide ring 22 are provided. The flexible ring 9b formed of a ring body has an inner surface having the same diameter as the connection port formed in a flat shape substantially the same as the inner surface of the tube body, so that the flow is smoothed and solid objects are prevented from being moored. Furthermore, there is no reduction in the pipe cross-sectional area (inner diameter), which can be used for the sewage main pipe.

  In particular, the outer shell 5b can accurately form a partial spherical surface by blow molding, and the inner shell 3b can be divided so as not to delay the molding cycle such as rotational punching together with the shell body 20 and the inner shell ring 21. It can be molded at low cost by ordinary injection molding, and it is possible to avoid excessive fitting as much as possible.

  Further, since the inner shell 3b is divided into the shell body 20 and the inner shell ring 21, there is no hindrance to the assembly unlike the conventional thick-walled core, and the shell sliding surface, that is, the partial spherical surface is enlarged. As a result, it can be approximated to a ball joint and the connection angle can be increased like a flange-type pipe joint.

  These universal pipe joints 1, 1 a, 1 b can be connected to the PVC pipes installed in the public sewer mains or attached to a synthetic resin (made of PVC) small manhole installed in the public sewer. Used when connecting to PVC pipes. Of course, if it is not used for the sewage pipe facility, the filth reservoir is merely a reservoir.

  The seal packing may be provided on the flexible ring 9 side, and the flexible ring 9 may be a conical diameter-expanded ring or may be a flexible tubular member.

It is sectional drawing of the 1st Example of this invention. It is a usage example figure of FIG. FIG. 2 is an exploded sectional view of FIG. 1. It is a decomposition | disassembly cross section of FIG. It is sectional drawing of a 2nd Example. It is sectional drawing of a 3rd Example.

Explanation of symbols

1, 1a, 1b Universal pipe joint 3, 3b Inner shell 3, 5b Outer shell 9, 9b Flexible ring

Claims (5)

In a synthetic resin spherical universal joint with a partial spherical sliding surface,
A synthetic resin spherical free pipe characterized in that the partial spherical surface is formed of a shell, and a flat inner surface-shaped flexible body for preventing dirt accumulation is provided at the base of the shell. Fittings.   The synthetic resin universal pipe joint according to claim 1, wherein the tube axis is the same straight line before the spherical universal pipe joint is freely changed.   The synthetic resin spherical universal pipe joint according to claim 1 or 2, wherein the flexible body is composed of a pair of guide rings fixed to the shell side and opposed to each other and a driven ring slidingly contacting them. .   The spherical joint of synthetic resin made according to each of claims 1 to 3, wherein the outer or inner shell is divided so that the inner or outer shell is easily assembled.   The synthetic resin spherical universal pipe joint according to any one of claims 1 to 4, wherein the synthetic resin spherical universal pipe joint is used for a vinyl chloride pipe or a synthetic resin small manhole installed in a public sewer pipe.

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