JP7195571B2 - Joint structure for pipes and pipe fittings - Google Patents

Description

TECHNICAL FIELD The present invention relates to a joining structure for pipes and pipe joints used in constructing a pipe structure.

In a pipe structure constructed using a large number of pipes, adjacent pipes are connected via pipe joints at the outer peripheral surface of the pipe and the inner peripheral surface of the pipe joint. The pipe and the pipe joint are chemically adhered and fixed by applying an adhesive between them (for example, Patent Document 1).

JP 2018-025215 A

Adhesive fixation between a pipe and a pipe joint can be done by inserting the pipe into the pipe joint with an adhesive applied to the outer peripheral surface in advance and hardening it. There is a method of infiltrating a liquid adhesive (hereinafter referred to as adhesive liquid) into the gap formed between the surface and the inner peripheral surface of the pipe joint and curing it. If the gap is too small, it will be difficult to supply a sufficient amount of the adhesive liquid to the gap.

On the other hand, if the gap dimension is too large, the pipe may rattle and move during the injection of the adhesive, resulting in poor workability at the time of connection when assembling as designed.
In either case, there is a problem that the connection between the pipe and the pipe joint may be imperfect.

In order to solve the above-described problems in the prior art, the present invention reliably forms a flow path that guides a sufficient amount of adhesive liquid in the gap between the pipe and the pipe joint, thereby enabling reliable adhesive fixation. The object of the present invention is to create a joining structure for pipes and pipe joints.

Among the means for solving the above problems, the main means of the present invention are
The fitting end of the pipe is fitted into and connected to the fitting tube of the pipe joint, and the entire circumference is provided between the outer peripheral surface of the fitting end of the pipe and the inner peripheral surface of the fitting tube of the pipe joint. A joining structure of a pipe and a pipe joint that are adhered and fixed with a fluid adhesive liquid that is injected into a formed gap using capillary action,
A channel is formed on the inner peripheral surface of the pipe joint for guiding the fluid adhesive liquid from the end of the pipe joint to the depth of the gap, and has a height dimension that is half the gap in the radial direction. A plurality of guide protrusions are provided to contact the outer peripheral surface of the fitting end of the pipe, and the tips of the guide protrusions are formed in a horizontal plane, an arc-shaped plane along the circumferential direction, or a pointed shape. It is characterized by

According to the main means of the present invention, it is possible to form a channel that guides the adhesive liquid deep into the gap.

In another configuration of the present invention, the main means of the present invention is a ridge in which guide projections are formed along the pipe axis direction and arranged at intervals in the circumferential direction. It is the addition of the means of

In the above-described means, since the flow path is formed along the gap secured by the ridges (guiding projections), the adhesive liquid can be uniformly guided deep between the fitting tube and the fitting end, thereby Since it is possible to expand the area, it is possible to prevent variations in adhesion from place to place and stabilize the overall adhesion strength.

Another configuration of the present invention is obtained by adding a means that the guiding projections are crimps to the main means of the present invention.

In the above means, since the plurality of substantially mesh-like flow paths formed in the gaps function as capillaries, it is possible to reliably inject the adhesive liquid deeply by utilizing capillary action.

According to another configuration of the present invention, in any one of the above means, in a state in which the fitting end of the pipe is fitted in the fitting cylinder of the pipe joint, the guide convex portion overlaps the fitting cylinder and the fitting end of the pipe shaft. This means that it is formed over the entire area of the direction.

With the above-described means, since the guiding projections can be arranged substantially uniformly in the gap in the pipe axial direction and the circumferential direction, the flow paths for guiding the adhesive liquid can be uniformly arranged. Moreover, since the clearance dimension in the radial direction is made uniform, it is possible to suppress the occurrence of backlash.

ADVANTAGE OF THE INVENTION Since this invention becomes an above-described structure, there exists an effect shown below.
In the present invention, a sufficient amount of adhesive liquid can be introduced between the pipe and the pipe joint by flowing the adhesive liquid through the channel formed in the gap between the pipe and the pipe joint. Therefore, it is possible to reliably bond and fix the pipe and the pipe joint.

1 is an exploded perspective view showing part of a pipe construction as a first embodiment; FIG. It is a partial enlarged view of the II portion in FIG. 1 as the inner peripheral surface of the pipe joint. FIG. 3 is a perspective view showing a portion of the pipe construction in a connected state; FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 3 and a partially enlarged view thereof; FIG. 11 is an exploded perspective view showing part of a pipe structure as a second embodiment; FIG. 11 is an exploded perspective view showing part of a pipe construction as a third embodiment; It is a perspective view of the pipe joint which shows 4th Example. (a) is a front view of FIG. 7, (b) is a rear view of FIG. 7, (c) is a plan view of FIG. 7, and (d) is a bottom view of FIG. It is a perspective view of the pipe joint which shows 5th Example. (a) is a front view of FIG. 9, (b) is a front view of FIG. 9, (c) is a left side view of FIG. 9, and (d) is a plan view of FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an exploded perspective view showing a portion of a pipe structure as a first embodiment, FIG. 2 is a partial enlarged view of the portion II in FIG. 1 as the inner peripheral surface of a pipe joint, and FIG. 3 is a pipe structure in a connected state. FIG. 4 is a cross-sectional view taken along line IV--IV of FIG. 3 and its partial enlarged view.
As shown in FIG. 1, a pipe structure 1 is constructed by connecting a pipe 10 and a pipe joint 20. As shown in FIG. The pipe 10 is, for example, a resin-coated steel pipe in which a cylindrical steel pipe having a predetermined length dimension in the pipe axial direction is coated with a synthetic resin. The pipe 10 may also be a pipe 10 having an axial direction, and both ends in the pipe axial direction are fitted ends 11 .

The pipe joint 20 is a member configured by integrating two fitting cylinders 21 into which the fitting end 11 of the pipe 10 is fitted into a substantially L shape. Approximately triangular reinforcing ribs 22 are integrally formed on the outer peripheral surface 21a of the fitting tube 21 to reinforce the space between the intersecting fitting tubes 21 . 7 is a perspective view, FIG. 8(a) is a front view, FIG. 8(b) is a rear view, FIG. 8(c) is a plan view, and FIG. 8(d) is a bottom view. Like the pipe joint 20 of the fourth embodiment, three or more fitting cylinders 21 are joined in a crossed manner, and reinforcing ribs 22 are arranged between the crossing fitting cylinders 21 to integrate them. 9, the front view thereof in FIG. 10(a), the left side view thereof in FIG. 10(b), and the plan view thereof in FIG. 10(c). As in the pipe joint 20 of Fig. 2, a single through-fitting cylinder 21 through which the pipe 10 penetrates may be integrated into a substantially T-shaped configuration in which a vertical fitting cylinder 21 is provided from the center.

As shown in FIG. 2, a plurality of guiding projections P are formed on the inner peripheral surface 21b of the fitting cylinder 21 at predetermined intervals in the circumferential direction. The guide protrusion P shown in the first embodiment is formed of a ridge linearly extending along the pipe axis direction on the inner peripheral surface 21b of the fitting cylinder 21. The distal end is formed by a top wall P1 formed of an arcuate surface along the horizontal surface or the inner peripheral surface 21b in the circumferential direction. As shown in FIG. 4, the guiding protrusions P have a center angle θ of about 5 degrees between the adjacent guiding protrusions P and a width w of about 0.2 mm in the circumferential direction. It is formed to have a height dimension h of about 0.05 mm in diameter. In particular, in the radial direction, due to the fitting relationship with the gap S with the pipe 10, for example, if the gap S is 0.1 mm in diameter, the height of the guide protrusion P is preferably half that, 0.05 mm. The height at which the top wall P1 just contacts the outer peripheral surface 11a of the insertion end 11 of the pipe 10 is preferable.

As shown in FIGS. 3 and 4, when the fitting end 11 of the pipe 10 is inserted into the fitting tube 21 of the pipe joint 20 and fitted, the outer peripheral surface 11a of the fitting end 11 of the pipe 10 and the pipe joint 20 are fitted. A gap S is formed between the cylinder 21 and the inner peripheral surface 21b.

In this state, the plurality of guiding protrusions P protrude radially inward into the gap S, and the tips (top wall P1) of the plurality of guiding protrusions P extend from the outer peripheral surface of the fitting end 11 of the pipe 10. It is in contact with the entire length in the pipe axial direction while facing the 11a. Therefore, it is possible to suppress rattling in the radial direction between the fitting end 11 of the pipe 10 and the fitting tube 21 of the pipe joint 20 . Therefore, it is possible to stabilize the temporarily fixed state, which is the state before injecting the adhesive liquid, and to improve the workability during the work of injecting the adhesive liquid.

In this state, when the adhesive liquid is poured into the gap S, the space between the guiding protrusions P adjacent to each other in the circumferential direction functions as a flow path for guiding the adhesive liquid. Therefore, it is possible to secure a wide bonding area by allowing the adhesive liquid to penetrate deep into the gap S through such a plurality of flow paths. In addition, it is possible to suppress variations in the bonding portions formed in the pipe axial direction and the circumferential direction, so that it is possible to stabilize the bonding strength in the pipe axial direction and the circumferential direction. Moreover, since the top wall P1, which is the tip of the guiding projection P, is dissolved by the solvent, it functions as a medium that fills the gap S, and in this respect as well, it is possible to improve the bonding strength.

Furthermore, in the case of injecting the adhesive liquid in the state of being three-dimensionally assembled as the pipe structure 1, it may be necessary to inject the adhesive liquid from the bottom to the top in the vertical direction, but even in that case, Since the plurality of flow paths formed in the gap S function as capillaries, it is possible to allow the adhesive liquid to infiltrate from the bottom to the top in the vertical direction without any problem by utilizing capillary action. Therefore, the pipe 10 and the pipe joint 20 can be securely adhered and fixed, and can be connected in an inseparable state.

FIG. 5 is an exploded perspective view of a pipe construction as a second embodiment of the invention.
In the second embodiment, the guiding protrusion P is formed on the outer peripheral surface 11a of the pipe 10 and not formed on the inner peripheral surface 21b of the pipe joint 20. It is different from the first embodiment in which it is not formed on the surface 11a but is formed on the inner peripheral surface 21b of the pipe joint 20. FIG.

In the second embodiment as well, when the fitting end 11 of the pipe 10 is fitted into the fitting tube 21 of the pipe joint 20, the outer peripheral surface 11a of the fitting end 11 of the pipe 10 and the pipe joint 20 are in contact with each other as in the first embodiment. A gap S is formed between the fitting cylinder 21 and the inner peripheral surface 21b. On the other hand, although each of the guide projections P projects radially outward into the gap S, the top wall P1, which is the tip of each of the guide projections P, is a pipe joint. 20 is in contact with the inner peripheral surface 21b of the fitting tube 21 over the entire length in the tube axial direction.

Therefore, as in the first embodiment, by allowing the adhesive liquid to penetrate deep through the plurality of flow paths formed in the gap S, the entire gap between the fitting end 11 of the pipe 10 and the fitting cylinder 21 of the pipe joint 20 is completely closed. The pipe 10 and the pipe joint 20 can be inseparably connected while being securely adhered and fixed.
Although FIG. 5 illustrates a case where the guide protrusion P is formed on the outer peripheral surface 11a of the pipe 10 over the entire length, the guide protrusion P is formed when the pipe 10 is fitted into the pipe joint 20. It may be formed only at the portion that is actually joined in the assembled state, that is, the insertion end 11 that is the end of the pipe 10 .

FIG. 6 is a perspective view showing a pipe joint showing a third embodiment of the present invention.
The difference of the third embodiment from the first and second embodiments lies in the configuration of the pipe joint 20 and the shape of the guide projection P, and the other configurations and effects are the same as in the first and second embodiments. It is the same as the example.
The pipe joint 20 shown in the third embodiment has a configuration in which three fitting cylinders 21 are joined in a crossed manner, and reinforcing ribs 22 are arranged between the crossing fitting cylinders 21 to integrate them. , are employed at the corners of the pipe construction 1 .
Further, the guide convex portion P formed on the pipe joint 20 is formed of a embossing by a group of projections arranged in a scattered manner on the inner peripheral surface 21b of the fitting cylinder 21. As shown in FIG. Incidentally, in FIG. 6, individual projections constituting the guiding projection P are indicated by dots.
Here, as for the shape of each of the projections that constitute the guiding convex portion P, various shapes such as a hemispherical shape, a truncated cone shape, and a polypyramidal shape such as a triangular pyramid and a quadrangular pyramid can be adopted. The convex portion P may have a structure in which protrusions having these various shapes are mixed.
However, it is desirable that the flow paths formed between the guiding projections P are connected without interruption along the pipe axis direction over the entire area where the fitting tube 21 and the fitting end 11 overlap.

In the third embodiment, when the fitting end 11 of the pipe 10 is fitted into the fitting tube 21 of the pipe joint 20, the tips of the numerous guide protrusions P abut against the outer peripheral surface 11a of the fitting end 11 of the pipe 10. A gap S is formed between adjacent guiding protrusions P and adjacent guiding protrusions P. Such gaps S are connected in a substantially mesh-like manner to form a channel for guiding the adhesive liquid. .
Therefore, as in the first and second embodiments, the bonding area can be expanded over the entire gap S by allowing the adhesive liquid to penetrate deep through the substantially mesh-like flow path formed in the gap S. As a result, the pipe 10 and the pipe joint 20 can be connected inseparably while being securely adhered and fixed.

In addition, in the case of a configuration in which a large number of guiding protrusions P are arranged at a high density, the total area occupied by the gaps S becomes smaller and the width of the substantially mesh-like flow path for guiding the adhesive liquid becomes narrower. When the arrangement density of the guiding protrusions P is lowered, the total area occupied by the gaps S increases and the width of the substantially mesh-like flow path increases. Adhesive strength can be improved by making the most of capillary action.

As described above, the configuration and effects of the present invention have been described according to the embodiments, but the embodiments of the present invention are not limited to the above embodiments.
For example, in the above-described second embodiment, as an example of the guiding projections P constituting the texture, a group of projections made up of a large number of projections arranged in a scattered pattern has been described. It may be composed of ridges consisting of thin small walls, and may be composed of irregularly arranged wrinkled embossments. In this case, the flow paths formed within the gap S are also arranged irregularly. Further, even if the grain pattern is wood grain, rock grain, sand grain, geometric pattern, or the like, a similar effect can be expected by forming a flow path.

In addition, in the third embodiment, the guiding projection P is formed on the inner peripheral surface 21b of the fitting tube 21, but the guiding projection P is formed on the outer circumference of the pipe 10 as in the second embodiment. A configuration may be adopted in which the groove is formed on the surface 11 a and not formed on the inner peripheral surface 21 b of the pipe joint 20 .

INDUSTRIAL APPLICABILITY The present invention can be used in a wider range of applications in the field of joining structures of pipes and pipe joints for constructing pipe structures.

Reference Signs List 1: pipe structure 10: pipe 11: fitting end 11a: outer peripheral surface of fitting end 20: pipe joint 21: fitting tube 21a: fitting tube outer peripheral surface 21b: fitting tube inner peripheral surface 22: reinforcing rib P: Guide convex part P1: top wall S: gap

Claims (4)

The fitting end of the pipe is fitted into and connected to the fitting tube of the pipe joint, and the entire circumference is provided between the outer peripheral surface of the fitting end of the pipe and the inner peripheral surface of the fitting tube of the pipe joint. A joining structure of a pipe and a pipe joint that are adhered and fixed with a fluid adhesive liquid that is injected into a formed gap using capillary action,
A channel is formed on the inner peripheral surface of the pipe joint for guiding the fluid adhesive liquid from the end of the pipe joint to the depth of the gap, and has a height dimension that is half the gap in the radial direction. A plurality of guide protrusions are provided to contact the outer peripheral surface of the fitting end of the pipe, and the tips of the guide protrusions are formed in a horizontal plane, an arc-shaped plane along the circumferential direction, or a pointed shape. A joining structure of a pipe and a pipe joint, characterized by: 2. The joining structure of a pipe and a pipe joint according to claim 1, wherein the guiding projections are ridges formed along the pipe axis direction and arranged at intervals in the circumferential direction. 2. The joining structure of a pipe and a pipe joint according to claim 1, wherein the guiding protrusion is a crimp. 2. A guiding protrusion is formed over the entire area in the pipe axial direction where the fitting tube and the fitting end overlap when the fitting end of the pipe is fitted into the fitting tube of the pipe joint. 4. Joining structure of pipe and pipe joint according to any one of items 3.

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