JPS60541Y2 - lining pipe - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lined pipe in which the inner peripheral surface of a flange pipe is lined with a lining, and is particularly useful for use as a conduit for an electromagnetic flowmeter.

Generally, as shown in FIG. 1, a lining tube 1 has a flange tube 2 and a lining 3 made of synthetic resin or the like, which is an insulating material, is lined on the inner peripheral surface of the flange tube 2 over the flange portion thereof.

However, because the lining 3 tends to peel off from the flange pipe 2 due to negative pressure in the pipe, conventionally, a reinforcing pipe 6 with a large number of holes 5 on the circumferential surface as shown in FIG. As shown in FIG. 3, it is embedded in the lining 3 by molding.

Such a lining pipe 4 has a reinforcing pipe 6 inside the flange pipe 2.
is inserted, both ends of the reinforcing tube 6 are supported by a fixing device or the like while maintaining a constant distance from the flange tube 2, and the lining 3 is formed by molding so as to fill the entire reinforcing tube 6.

Therefore, the lining 3 enters the hole 5 of the reinforcing tube 6 and is locked, so that the lining 3 is prevented from peeling off from the flange tube 2.

However, when manufacturing the above-mentioned conventional lining tube, the reinforcing tube is pressed against the synthetic resin etc. during molding, so there is a risk that the reinforcing tube will be molded to one side.
It was extremely difficult to bury the reinforcing pipe concentrically with the flange pipe.

SUMMARY OF THE INVENTION In view of the above drawbacks of the prior art, it is an object of the present invention to provide a lining pipe equipped with a reinforcing pipe that can be easily concentric with the flange pipe during molding.

The structure of the present invention, which is distantly related to such an object, is that a reinforcing tube having a number of holes for locking the lining is embedded in a lining lined on the inner circumferential surface of the tube. The reinforcing tube is provided with a plurality of protrusions that protrude outward in the radial direction and abut against the inner circumferential surface of the tube to maintain concentricity between the tube and the reinforcing tube.

Embodiments of the present invention will be described in detail below with reference to the drawings.

As shown in FIG. 4, the lining pipe of the present invention is a reinforcing pipe formed to have approximately the same length as the flange pipe 10, inside a lining 11 made of synthetic resin, aluminum or the like, lined on the inner circumferential surface of the flange pipe 10. 12 is embedded by molding.

As shown in FIG. 5, this reinforcing pipe 12 has a large number of holes 13 for locking the lining, and continuous projections 1 along the circumferential direction.
A plurality of (two in this embodiment) 4 are provided on the outer peripheral surface.

When the reinforcing tube 12 is inserted into the flange tube 10 and resin-molded, the tip of the protrusion 14 comes into contact with the inner peripheral surface of the flange tube 10, and the flange tube 10 and the reinforcing tube 12 are concentric. They are provided so that they can be easily removed, and they are all formed at the same height.

Therefore, concentricity can be easily achieved by simply fitting the reinforcing tube 12 into the flange tube 10 during molding.

Incidentally, instead of the circumferentially continuous protruding part 14, as shown in FIG. 6, a spirally continuous protruding part 15 may be provided on the outer circumferential surface of the perforated reinforcing tube 12.

Next, a second embodiment will be described.

In this embodiment, as shown in FIG. 7, a plurality of protrusions 16 (four in this embodiment) extending in the axial direction are provided on the outer circumferential surface of the perforated reinforcing tube 12.

Moreover, the same effect can be obtained by forming a reinforcing tube 17 with a porous hole and having a regular polygonal cross section as shown in FIG. 8 in place of the protrusion 16.

In this case, since each ridge line portion 17a contacts the inner peripheral surface of the flange pipe 10, concentricity can be easily established.

Furthermore, a third embodiment is shown in FIG.

As shown in the figure, protrusions 18 of the same height are provided on the outer peripheral surface of the perforated reinforcing tube 12, and these protrusions 18
The shape is hemispherical.

Further, instead of the hemispherical protrusion 18, a rectangular parallelepiped-shaped protrusion 19 shown in FIG. 10 may be provided, and the same effect can be obtained.

Next, a fourth embodiment is shown in FIG.

In this embodiment, each of the holes 13 provided in the reinforcing tube 12 has a protrusion, which locks the lining 11 and makes the flange tube 10 and the reinforcing tube 12 concentric.

As shown in FIGS. 12a and 12b, an enlarged perspective view and an enlarged sectional view of the hole 20 of the protruding member, a rectangular protrusion 20a is formed, and holes 20b are provided on both sides of the protrusion 20a. There is.

Further, instead of the protruding hole 20, a protruding hole 21 having a protruding piece 21b on the periphery of the hole 21a as shown in FIGS. 13a and 13b may be provided.

These can be molded and processed all at once, which saves time and effort.

Furthermore, a fifth embodiment is shown in FIG.

As shown in the figure, in this embodiment, a plurality of projecting pieces 22 projecting outward are provided on the outer periphery of the end of the perforated reinforcing pipe 12.

These protrusions 22 are formed by forming protrusions at the ends during molding of the reinforcing tube 12 and bending the protrusions outward in the radial direction.

This projecting piece 22 is also formed at the same height, thereby ensuring concentricity with the reflanged pipe 10.

Also, instead of providing the protruding piece 22 at the end of the reinforcing pipe 12, the first
As shown in FIG. 5, both ends 23a of the perforated reinforcing tube 23 are expanded into a trumpet shape, thereby making it possible to make the flange tube 10 and the reinforcing tube 23 concentric.

The reinforcing tubes described in the first to fifth embodiments are inserted into the flange tube and molded with synthetic resin or the like, thereby forming a lining.

In this case, the respective protrusions provided on the reinforcing pipe ensure that the reinforcing pipe and the flange pipe are concentric, so the reinforcing pipe does not shift to one side when molding the lining.
Quality can be improved.

Furthermore, since no special processing is required for the flange pipe, the cost of the product can be reduced.

[Brief explanation of drawings]

Figures 1 to 3 relate to conventional examples; Figure 1 is a longitudinal cross-sectional view of a lining pipe, Figure 2 is a perspective view of a reinforcing pipe, and Figure 3 is a lining pipe with a reinforcing pipe buried in the lining. longitudinal section,
Figures 4 to 15 relate to the present invention; Figure 4 is a longitudinal cross-sectional view of a lining pipe, Figure 5 is a perspective view of a reinforcing pipe with continuous protrusions in the circumferential direction, and Figure 6 is a spiral lining pipe. Fig. 7 is a perspective view of a reinforcing pipe with protrusions continuous in the tube axis direction, Fig. 8 is a perspective view of a reinforcing pipe with a regular polygonal cross section. , FIGS. 9 and 10 are perspective views of reinforcing tubes with hemispherical and rectangular parallelepiped protrusions, FIG. 11 is a perspective view of reinforcing tubes with holes with protrusions, and FIG. 12a shows the protrusions. FIG. 12 is an enlarged perspective view of a hole, FIG. 12 is a sectional view thereof, FIG. FIG. 15 is a perspective view of a reinforcing tube having protrusions on its outer periphery. FIG. In the drawing, 10 is a flange pipe, 11 is a lining, 12 is a reinforcing pipe, 13 is a hole, 14 is a protrusion continuous in the circumferential direction,
15 is a protrusion continuous in a spiral shape, 16 is a protrusion continuous in the tube axis direction, 17 is a reinforcing tube formed into a regular polygon, 17
a is a ridge line portion, 18 is a hemispherical protrusion, 19 is a rectangular parallelepiped protrusion, 20.21 is a hole with a protrusion, 20a is a protrusion, 2° by 21a is a hole, 21b, 22 are protrusions, 23 23a is a reinforcing tube having a trumpet-shaped end, and 23a is a trumpet-shaped end.

Claims (1)

[Scope of utility model registration request] In a lined pipe in which a reinforcing pipe with a number of holes for locking the lining is buried in a lining lined on the inner circumferential surface of the pipe, the distal end protrudes outward in the radial direction and the inner circumference of the pipe is A lining pipe characterized in that the reinforcing pipe is provided with a plurality of protrusions that abut against a surface and maintain the concentricity of the pipe and the reinforcing pipe.