JP2021101117A - Synthetic resin flange fitting - Google Patents

Abstract

To provide a synthetic resin flange joint provided with sufficient strength without using separate members such as a reinforcement member.SOLUTION: A synthetic resin flange fitting 100 includes a loose flange 200 and a pipe part 300 provided with a flange part 310 regulating a position of the loose flange 200 on one end side. A flange part 310 is provided with a recessed groove 312 in a circumferential direction on an end surface on the other end side opposite the one end side. The loose flange 200 is provided in the direction away from a pipe central axis of a pipe part with: a protrusion 210 engaging the recessed groove 312 on an end surface on the one end side; a recess 220 which engages an outer peripheral surface 314 of the flange part 310 to a start position 316 of the recessed groove; and an engaging piece 230 engaging the outer peripheral surface 314 of the flange part 310 from an outer peripheral side. Regarding the loose flange 200, the relation, 2×T(X)<K(X), is satisfied between length T(X) of the projection 210 and the length K(X) of an engaging piece 230.SELECTED DRAWING: Figure 3

Description

The present invention relates to a flange pipe joint made of synthetic resin, and is a pipe joint used for flange connecting a pipe made of synthetic resin (resin pipe) used for pipes of gas, water, sewage, etc. (particularly tap water pipe). Regarding.

Conventionally, resin pipes such as polyethylene, polypropylene, and polybuden are often used as pipes for gas, water, sewage, and the like. As a structure for connecting such a resin pipe, a loose flange (turning) is attached to a flange portion provided at the end of the pipe (a pipe or a short pipe having such a flange provided at the end of the pipe may be called a flange adapter). A structure is known in which a movable flange) is engaged to connect the flange. However, when a large stress is applied to the flange connection part, the stress may concentrate at the base of the flange part and cause cracks, etc. Therefore, conventionally, this part has been made thicker or the connection radius has been increased. I try to prevent damage.

Against this background, Japanese Patent Application Laid-Open No. 11-153274 (Patent Document 1) discloses a pipe joint capable of improving the strength of the flange to which the loose flange engages and withstanding a large stress. The pipe joint disclosed in Patent Document 1 is a pipe joint in which a loose flange is used to connect a flange, and the flange portion of a short pipe (flange adapter) with a synthetic resin flange that engages with the loose flange is made of steel. It is characterized in that a reinforcing member made of engineering plastic or the like is integrally molded, and the flanged short tube and the joint body made of synthetic resin are provided with a loose flange on the outside of the flanged short tube. After that, the two are joined by heat fusion to form a pipe joint.

Japanese Unexamined Patent Publication No. 11-153274

However, even if the pipe joint disclosed in Patent Document 1 can improve the strength of the flange to which the loose flange engages and can withstand a large stress, it is reinforced with steel, engineering plastic, or the like. It is only due to the integral molding of the members, and there is a problem that it leads to an increase in cost and an increase in weight. From another point of view, when the loose flange is set on the pipe portion provided with the flange portion that regulates the position of the loose flange on one end side, if the positioning is difficult, the workability increases (weight increases as described above). Especially if you do).

The present invention has been developed in view of the above-mentioned problems, and an object of the present invention is to provide a loose flange made of synthetic resin and a flange portion for regulating the position of the loose flange on one end side. It is a flange pipe joint including a pipe part (flange adapter) made of synthetic resin, and since it has sufficient strength without using a separate member such as a reinforcing member, it does not lead to an increase in cost or weight, and further positioning. It is an object of the present invention to provide a flange pipe joint which is easy to operate and has favorable workability.

In order to achieve the above object, the synthetic resin flange pipe joint according to the present invention takes the following technical measures.
That is, the synthetic resin flange pipe joint according to the present invention includes a loose flange made of synthetic resin and a pipe portion made of synthetic resin provided with a flange portion that regulates the position of the loose flange on one end side of the pipe body. A flange pipe joint, wherein the loose flange has a substantially annular shape that is thin in the longitudinal direction of the pipe body, and the pipe body is fitted in the central hole thereof and two or more bolts for fastening are passed around the flange pipe joint. The flange portion is provided with a circumferential concave groove on the end surface on the other end side opposite to the one end side, and the loose flange is provided with the concave groove on the end surface on the one end side. A convex portion that engages with, a concave portion that engages from the outer peripheral surface of the flange portion to the start position of the concave groove, and a locking piece that locks the outer peripheral surface of the flange portion from the outer peripheral side. The concave groove, the convex portion, the concave portion, and the locking piece have a substantially rectangular shape when the longitudinal cross section without the bolt hole is viewed through the central axis of the pipe in order of separation from the central axis of the pipe. The longitudinal dimension of the tube body is defined as the length dimension, and the radial dimension of the tube body is defined as the width dimension. With respect to the loose flange, the length T (X) of the convex portion is defined as the width M (Y) which is the groove width of the concave groove and the width H from the outer peripheral surface of the flange portion to the start position of the concave groove. The relationship of 2 × T (X) <K (X) is established as the width T (Y) of the convex portion, the length K (X) of the locking piece, and the width K (Y) of the locking piece. It is characterized by.

Preferably, it can be configured so that the relationship of T (Y) <H <K (Y) is established.
More preferably, it can be configured so that the relationship of (5/7) × M (Y) ≦ T (Y) <M (Y) is established.
More preferably, the loose flange is provided with ribs on the entire circumference of the inner peripheral side of the substantially annular shape on the end surface on the other end side, and a lightening portion is provided around the bolt hole other than the rib side. The rib side may be provided with a connecting portion to be connected to the rib, and the length L of the rib at the connecting portion may be longer than the diameter D of the bolt hole.

More preferably, the loose flange comprises a plurality of protrusions so as to project from the inner peripheral surface of the central hole in the direction of the central axis of the pipe, and / or the pipe portion looks at the longitudinal section. A flat portion having a length dimension corresponding to the inner peripheral length of the central hole between the outer periphery of the pipe body and the concave groove, and a step that increases in the radial direction is formed on the other end side. It can be configured to include a flat surface portion prepared for the above.

More preferably, the flange portion is provided with a packing groove into which the annular packing is inserted on the end surface on the one end side, and when the longitudinal cross section is viewed, a line extending the center line of the packing groove intersects the concave groove. It can be configured as follows.
More preferably, the loose flange synthetic resin can be configured to be a polyolefin resin or nylon resin reinforced with glass fibers or carbon fibers.

According to the present invention, it is a flange pipe joint including a loose flange made of synthetic resin and a pipe portion (flange adapter) made of synthetic resin provided with a flange portion for regulating the position of the loose flange on one end side. It is possible to provide a flange pipe joint which is easy to position and preferable in workability, because it has sufficient strength without using a separate member such as a reinforcing member, which does not lead to an increase in cost or weight.

It is an overall side view (upper half cross-sectional view) along the longitudinal direction of a pipe body 350 about the synthetic resin flange pipe joint 100 which concerns on embodiment of this invention. (A) Front view of the loose flange 200 constituting the synthetic resin flange pipe joint 100 shown in FIG. 1 (a view of the loose flange 200 viewed from one end side of the flange portion 310 of the pipe portion 300), (B). 2BU cross-sectional view (upper half) and 2BD cross-sectional view (lower half) shown in FIG. 2 (A), (C) rear view (loose flange 200 viewed from the other end side of the pipe portion 300 opposite to one end side). Figure). It is a detailed cross-sectional view of the synthetic resin flange pipe joint 100 shown in FIG. It is a figure corresponding to FIG. 2 and shows the loose flange 201 different from the loose flange 200. It is a figure corresponding to FIG. 3 and shows the pipe part 301 different from the pipe part 300.

Hereinafter, with respect to the synthetic resin flange pipe joint 100 (hereinafter, may be simply referred to as a flange pipe joint or a pipe joint) according to the embodiment of the present invention, the longitudinal direction of the pipe body 350 for the synthetic resin flange pipe joint 100. 1 showing an overall side view (semi-cross-sectional view) along the line, and a front view of the loose flange 200 constituting the synthetic resin flange pipe joint 100 (the loose flange 200 from one end side of the flange portion 310 in the pipe portion 300). 2 (A) showing (viewed), FIG. 2 (B) showing a 2BU sectional view (upper half) and a 2BD sectional view (lower half) shown in FIG. 2 (A), and a rear view (in the pipe portion 300). FIG. 2C shows a view of the loose flange 200 viewed from the other end side opposite to one end side, and FIG. 3 shows a detailed cross-sectional view of the synthetic resin flange pipe joint 100 shown in FIG. It will be described in detail with reference.

The synthetic resin flange pipe joint 100 is a synthetic resin provided with a loose flange 200 made of synthetic resin (preferable material will be described later) and a flange portion 310 for regulating the position of the loose flange 200 on one end side of the pipe body 350. Includes a tube section (sometimes referred to as a short tube section or flange adapter) 300 made of. The loose flange 200 has a substantially annular shape that is thin in the longitudinal direction of the pipe body 350, and the pipe body 350 is fitted in the central hole 202 thereof and two or more (8 in this case) through which a fastening bolt is passed. The bolt hole 240 is provided.

The flange portion 310 provided on one end side of the pipe body 350 in the pipe portion 300 includes a concave groove 312 in the circumferential direction on the end surface on the other end side opposite to the one end side. On the other hand, the loose flange 200 has a convex portion 210 that engages with the concave groove 312 and a concave portion that engages from the outer peripheral surface 314 of the flange portion 310 to the start position 316 of the concave groove on the end surface on one end side. The 220 and the locking piece 230 that locks the outer peripheral surface 314 of the flange portion 310 from the outer peripheral side are sequentially provided in the direction of separating from the pipe central axis of the pipe portion. As shown in the 2BU cross section of FIG. 2B, looking at the longitudinal cross section that passes through the central axis of the pipe and has no bolt hole 240, the concave groove 312, the convex portion 210, the concave portion 220, and the locking piece 230 have a substantially rectangular shape. is there.

Here, although not limited, the material of the pipe portion 300 constituting the synthetic resin flange pipe joint 100 is polyethylene resin, and the material of the loose flange 200 is a polyolefin reinforced with glass fiber or carbon fiber. Resin (polypropylene resin, polyethylene resin, etc.) or nylon resin. Further, although not limited, the nominal diameters of the pipes connected by the synthetic resin flange pipe joint 100 are about 50, 75, 100, 150. Further, the central view of FIGS. 1 and 3 shows a state in which the concave groove 312 and the convex portion 210 are engaged with each other and the position of the loose flange 200 is restricted. Here, except for the central view of FIG. 3, one is a diagram for explaining the flange portion 310 in the pipe portion 300, and the other is a diagram for explaining a 2BU cross section in the loose flange 200.

Then, in order to explain the characteristic shape, the dimensions are defined as follows. The longitudinal dimension of the pipe body 350 is the length dimension, and the radial dimension of the pipe body 350 is the width dimension. With respect to the pipe portion 300, the length M (X), which is the depth of the concave groove 312, and the concave groove 312 The width M (Y), which is the groove width, and the width H from the outer peripheral surface 314 of the flange portion 310 to the start position 316 of the concave groove 312. With respect to the loose flange 200, the length T (X) of the convex portion 210, the width T (Y) of the convex portion 210, the length K (X) of the locking piece 230, and the width K (Y) of the locking piece 230. ..

The flange pipe joint 100 has a shape in which a relationship of 2 × T (X) <K (X) is established between these dimensions. Further, the flange pipe joint 100 has a shape in which a relationship of T (Y) <H <K (Y) is established between these dimensions. The flange pipe joint 100 having these shapes can enhance the bending rigidity of the flange pipe joint 100 when the loose flange 200 is combined with the pipe portion 300 as shown in FIG. Further, the flange pipe joint 100 includes a shape in which the relationship of (5/7) × M (Y) ≦ T (Y) <M (Y) is established between these dimensions. The flange pipe joint 100 having this shape can improve the water leakage resistance at the time of bending when the loose flange 200 is combined with the pipe portion 300 as shown in FIG. More specifically, the pipe portion 300 is combined with the loose flange 200, (1) the end face on one end side of the flange portion 310 and the end face on one end side of the loose flange 200 are fixed to the wall surface, and (2) the pipe. A displacement was forcibly applied on the other end side of the main body 350 (the pipe portion 300 was forcibly and simulatedly bent), and (3) water leakage at the portion fixed to the wall surface in (1) above was verified. It was confirmed that the end face on one end side of the flange portion 310 was preferably pressed against the wall surface to close the gap, so that the water leakage was improved as compared with the flange pipe joint not provided with this shape. Further, even when the material of the loose flange 200 is a polyolefin resin (polypropylene resin, polyethylene resin, etc.) or nylon resin reinforced with glass fiber or carbon fiber as described above (even when the material is changed from metal to fiber reinforced resin). It was confirmed that the required performance for water leakage was satisfied.

Further, referring to the 2BD cross-sectional view of FIG. 2 (B) and FIG. 2 (C), the loose flange 200 has a substantially annular shape on the inner peripheral side of the end surface on the other end side shown in FIG. 2 (C). The rib 250 is provided on the entire circumference, and the periphery 242 of the bolt hole 240 is provided with a lightening portion 254 other than the rib 250 side, and a connecting portion 252 connected to the rib 250 is provided on the rib 250 side. And, characteristically, the length L of the rib 250 at the connecting portion 252 is longer than the diameter D of the bolt hole 240. The flange pipe joint 100 having this shape can be made lighter in weight by providing the lightening portion 254, and can be provided with sufficient strength around the bolt hole 240.

Next, the feature of the synthetic resin flange pipe joint 100 regarding the ease of positioning when the loose flange 200 is combined with the pipe portion 300 will be described.
As shown in FIG. 3, the pipe portion 300 corresponds to the inner peripheral length R (X) of the central hole 202 of the loose flange 200 between the outer circumference of the pipe body 350 and the concave groove 312 in view of the longitudinal cross section. A flat surface portion 354 having a length A (X), which is a length dimension to be formed, is provided. The flat surface portion 354 is provided with a step 356 that increases in the radial direction on the other end side. Such a flat surface portion 354 is formed by scraping the outer periphery of the member before cutting (during production) shown by the dotted line in FIG. 3, although not limited to the above. The flange pipe joint 100 having this shape in the pipe portion 300 is formed in the pipe body 350 when the central hole 202 of the loose flange 200 is fitted into the outer periphery of the pipe body 350 from the other end side of the pipe portion 300 and these are combined. When the outer circumference exceeds the step 356, positioning in the longitudinal direction can be easily performed.

Although not limited, the flange portion 310 is also formed by scraping each part of the member before cutting (during production), and the loose flange 200 is also formed before cutting (manufacturing), as in the case of the flat surface portion 354. It is formed by scraping each part of the member (on the way).
By the way, when the nominal diameter of the pipe connected by the synthetic resin flange pipe joint 100 is small, the thickness of the pipe wall 352 of the pipe body 350 becomes thin. In such a case, it may be difficult to form the flat surface portion 354 by scraping the outer circumference of the pipe body 350 shown by the dotted line in FIG. That is, the wall thickness of the pipe wall 352 must be secured by forming the flat portion 358 having no step as shown in FIG. 5 (however, the pipe wall 352 is not thinly represented in FIG. 5) described later (however, the pipe wall 352 is not thinly represented). If a step is provided, the wall thickness of the pipe wall 352 may become too thin).

In such a case, the characteristics of the synthetic resin flange pipe joint 100 regarding the ease of positioning when the loose flange 200 is combined with the pipe portion 300 can be realized by the loose flange 201 having a structure different from that of the loose flange 200. it can.
As shown in FIG. 4, the loose flange 201 is provided with a plurality of (here, four) protrusions 260 so as to project from the inner peripheral surface of the central hole 202 in the direction of the pipe central axis. Although not limited to, in FIG. 4, the protrusion 260 has a substantially semicircular shape when the vertical cross section perpendicular to the central axis of the pipe is viewed, and a substantially semicircular shape when the longitudinal cross section is viewed. To be equipped. In addition to such a shape, the protrusion 260 may be, for example, hemispherical rather than substantially semi-cylindrical, and such a hemispherical protrusion may be formed on the inner peripheral surface of the central hole 202 in the direction of the tube center axis. Such hemispherical protrusions may be arranged in the circumferential direction on the inner peripheral surface of the central hole 202. The loose flange 200 and the loose flange 201 differ only in the presence or absence of the protrusion 260, and the other structures are exactly the same. The flange pipe joint 100 having this shape on the loose flange 201 is formed by fitting the central hole 202 of the loose flange 201 into the outer periphery of the pipe body 350 from the other end side of the pipe portion 300 and combining them. Since the pipe center axis of the pipe body 350 and the center position of the central hole 202 of the loose flange 201 can be substantially matched by the protrusions 260 having a plurality of protrusions on the outer circumference (the pipe is formed from the inner peripheral surface of the center hole 202 of the loose flange 201). Positioning can be easily performed (because the protrusion 260 protruding in the direction of the central axis is forcibly fitted while being in sliding contact with the outer peripheral surface of the pipe body 350).

In order to realize ease of positioning when the loose flange 200 is combined with the pipe portion 300, even if the pipe portion 300 is provided with a flat surface portion 354 (provided with a step 356), a protrusion like the loose flange 201 is provided. It does not matter whether the part 260 is provided or both are provided.
When pipes are connected using this synthetic resin flange pipe joint, the flange surface (pipe portion 30)
An annular packing having an elliptical shape or the like whose cross section is not a planar shape may be adopted for the end face on one end side of the collar portion 310 of 0). In such a case, as shown in FIG. 5, a packing groove 320 into which the annular packing G is inserted is provided on the end surface on one end side of the flange portion 310, and the center line of the packing groove 320 is viewed from the longitudinal cross section. A line extending the one-dot chain line shown in FIG. 5 other than the central axis of the pipe intersects the concave groove 312. The pipe portion 300 and the pipe portion 301 differ only in the presence or absence of the packing groove 320 (and the step 356 in the flat surface portion 354), and the other structures are exactly the same. In this flange pipe joint 100 provided with this shape in the pipe portion 301, since the line extending the center line of the packing groove 320 intersects the concave groove 312 (the packing groove 320 and the concave groove 312 are positioned back to back). The annular packing G inserted into the packing groove 320 is pressed by the convex portion 210 of the loose flange 200 fitted in the concave groove 312 of the pipe portion 301 through the concave groove 312. The water stopping property can be improved.

As described above, according to this synthetic resin flange pipe joint, since it has sufficient strength without using a separate member such as a reinforcing member, it does not lead to cost increase or weight increase, and positioning is easy and workability is improved. preferable.
It should be noted that the embodiments disclosed this time are exemplary in all respects and are not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and it is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

The present invention is preferable for a flange pipe joint made of synthetic resin, and since it has sufficient strength without using a separate member such as a reinforcing member, it does not lead to an increase in cost or weight, and it is easy to position and workability. Especially preferable in terms of preference.

100 Synthetic resin flange pipe joint 200, 201 Loose flange 300, 301 Pipe part (short pipe part, flange adapter)
310 collar 350 pipe body 352 pipe wall

Claims (7)

A flange pipe joint including a loose flange made of synthetic resin and a pipe portion made of synthetic resin having a flange portion that regulates the position of the loose flange on one end side of the pipe body.
The loose flange has a substantially annular shape that is thin in the longitudinal direction of the pipe body, and the pipe body is fitted in the central hole thereof and has two or more bolt holes around which a fastening bolt is passed.
The collar portion is provided with a circumferential groove on the end surface on the other end side opposite to the one end side.
The loose flange has a convex portion that engages with the concave groove, a concave portion that engages from the outer peripheral surface of the flange portion to the start position of the concave groove, and an outer circumference of the flange portion on the end surface on one end side. Locking pieces for locking the surface from the outer peripheral side are provided in order in a direction away from the pipe center axis of the pipe portion.
Looking at the longitudinal cross section that passes through the central axis of the pipe and does not have the bolt holes, the concave groove, the convex portion, the concave portion, and the locking piece have a substantially rectangular shape.
The longitudinal dimension of the pipe body is defined as the length dimension, and the radial dimension of the pipe body is defined as the width dimension.
With respect to the pipe portion, the length M (X) which is the depth of the concave groove, the width M (Y) which is the groove width of the concave groove, and the width from the outer peripheral surface of the flange portion to the start position of the concave groove. As H
With respect to the loose flange, the convex portion length T (X), the convex portion width T (Y), the locking piece length K (X), and the locking piece width K (Y).
A synthetic resin flange pipe joint characterized in that a relationship of 2 × T (X) <K (X) is established. The synthetic resin flange fitting according to claim 1, wherein the relationship of T (Y) <H <K (Y) is established. The synthetic resin flange fitting according to claim 1 or 2, wherein the relationship of (5/7) × M (Y) ≦ T (Y) <M (Y) is established. The loose flange is formed on the end face on the other end side.
Ribs are provided on the entire inner circumference of the substantially annular shape.
Around the bolt hole, a lightening portion is provided in addition to the rib side, and a connecting portion connected to the rib is provided on the rib side.
The synthetic resin flange pipe joint according to any one of claims 1 to 3, wherein the length L of the rib in the connecting portion is longer than the diameter D of the bolt hole. The loose flange is provided with a plurality of protrusions so as to project from the inner peripheral surface of the central hole in the direction of the pipe central axis.
And / or
The pipe portion is a flat surface portion having a length dimension corresponding to the inner peripheral length of the central hole between the outer periphery of the pipe body and the concave groove when viewed in the longitudinal cross section. The synthetic resin flange pipe joint according to any one of claims 1 to 4, wherein a flat surface portion having a step that increases in the radial direction is provided on the other end side. A packing groove into which an annular packing is inserted is provided on the end surface of the flange portion on one end side, and when the longitudinal cross section is viewed, a line extending the center line of the packing groove intersects the concave groove. The synthetic resin flange pipe joint according to any one of claims 1 to 5. The synthetic resin flange pipe joint according to any one of claims 1 to 6, wherein the loose flange synthetic resin is a polyolefin resin or nylon resin reinforced with glass fiber or carbon fiber.

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