JPS58152995A - Joint structure of rubber lining steel pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a so-called rubber-lined steel pipe in which the inner surface of the steel pipe is coated with synthetic rubber, and more particularly to improvements in the joint portion thereof.

In general, rubber-lined steel pipes are suitable for transporting slurry containing solids in the fluid due to the abrasion resistance of rubber. It has a wide range of uses as it is effective even in cases where steel materials contain components that tend to corrode them.

However, in the past, no special consideration was given to the joint flat part of rubber-lined steel pipes, and general flange joints were used.As a result, the lining layer A was interrupted at the joint part, as shown in Figure 1. , (2) A separate gasket I-B is used for sealing, and (2) a step C is created at the joint.

As a result, the solid matter in the slurry collides with the corner where the lining layer breaks, causing damage to the spot, causing the lining layer to peel off from the spot and corrosion of the steel material to begin. The sealing effect of the gasket is not sufficient (corrosion of the flange surface promotes leakage at the contact surface), and fluid leakage often occurs from the joint.

Furthermore, in recent years, there has been a trend to convey slurry under high pressure, and under such high pressure, fluid leakage from the joint becomes even more noticeable.

In view of the above circumstances, it is an object of the present invention to eliminate various drawbacks of conventional rubber-lined steel pipes and to provide a new rubber-lined steel pipe joint that can also be used for high pressure applications.

Therefore, the joint structure of the rubber-lined steel pipe of the present invention has the following features:
A rubber-lined steel pipe with metal flanges that abut against each other and are joined by a tool with the following configuration (technical means): A accommodating recess and an abutting surface connected to the flange accommodating recess are respectively formed, and the rubber lining layer is extended to the flange accommodating recess to form a flange-shaped rubber lining layer that is in close contact with each other. An O-ring groove is provided in the circumferential direction on one side of the rubber lining layer, and an OIJ song is fitted into the O-ring groove.

Therefore, each component of the joint structure of the present invention exhibits the following actions and functions. That is, when the flanges are tightened, the flanged rubber lining layers come into close contact with each other due to the tightening of the tool, but the abutting surfaces prevent them from being excessively compressed. 3) does not occur, and the O-ring is effectively held. In addition, since the brim-shaped rubber lining layer is restrained and accommodated in the brim-accommodating recess, deformation due to high pressure of the fluid in the pipe is prevented, and the contact surface of the brim-shaped rubber lining layer is
With the addition of song function, it exhibits a great sealing effect against high-pressure fluid. Further, since the abutment surface is made of metal contact, the fastening can withstand the force of strong tightening using a tool, and can also exhibit a sealing effect on this surface.

The present invention has the following unique effects due to its diagonal configuration.

(2) Since the joint portion is formed into a continuous smooth surface by the rubber lining layer, there is no difference in level, and therefore there is no damage (peeling) from this F portion.

(2) The connecting surface is double sealed by the contact surface of the brim-like rubber lining layer and the O-ring, so it can withstand high pressure and is effective as a joint for high-pressure pipes.

The present invention will be explained below based on the embodiments shown in FIGS. 2 and 3.

1 is one steel pipe to be joined, and 2 is the other steel pipe.

3.4 is a lining layer coated on the inner surface of the steel pipe 1.2, and is preferably made of urethane rubber due to its wear resistance and corrosion resistance, but other synthetic rubbers may also be used.

5.6 is a flange formed at the end of the steel pipe 1.2, and 5A and 6A are end surfaces of the flanges 5 and 6 that face each other. The end surfaces 5A and 6A have annular collar-accommodating recesses 51 and 61 and an abutting surface 52, respectively, from the inside of the tube toward the outside.
, 62 and a fitting portion 53; 63. That is, the flange housing recess g61.61 accommodates the flange-like lining layer and restrains its deformation in the outer diameter direction, and the abutment surfaces 52,
62, when both flanges 5 and 6 are tightened by the tool 7, the abutting surfaces 52.62 come into close contact and bear the tightening force; When the core portions of the flanges 5 and 6 fit together, the flanges 5 and 6 are centered and connected without creating a step on the inner surface. In addition to this embodiment, the end surfaces 5A and 6A may have a mode in which the end surfaces of the fitting portion 53.63 are brought into close contact with each other and the tightening force is borne together with the abutting surface 52.62, or a fitting portion 53.68 is formed. Instead, it is possible to adopt an embodiment in which only the flange-like portion and the abutting surface are provided.

5B and 6B are bolt through holes drilled at appropriate locations in the circumferential direction of the flange 5.6, and the bolt through holes 5B
, 6B, insert the bolt 71 of the tightening tool 7, and tighten the nut 7z.
Clamp and tighten both flanges 5 and 6. S/, a
/ is a diameter-reduced portion of each flange 5, 6, and the end of the diameter-reduced portion and the end of the steel pipe 1.2 are integrally fixed by welding. Note that the reduced diameter portions s/ and 6/Y may be omitted.

The lining layers 3, 4 are extended and coated on the inner circumferential surfaces of the flanges 5, 6, and are further coated on the end surfaces 5A of the flanges 5.6.
, 5B is bent and extended, and the brim-shaped rubber lining layer 3
A, 4A is formed. The brim-shaped rubber lining layer 3A,
4A is restrained and accommodated in the flange accommodation recesses fJ 51 and 61.

8 is an annular O formed on one side (3A in this example) of the brim-shaped rubber lining layers that are brought into close contact with each other.
The O-ring 9 is fitted into the O-ring groove S, which is a ring groove.

[Brief explanation of the drawing]

Fig. 1 is a partial longitudinal cross-sectional view of a joint portion of a conventional rubber-lined steel pipe, Fig. 2 is a longitudinal cross-sectional view showing an embodiment of a joint portion of a rubber-lined steel pipe of the present invention, and Fig. 3 is an enlarged view of the main parts thereof. It is. 1.2... Steel pipe, 3, 4... Rubber lining layer, SA, 4A... Flange-shaped rubber lining layer, S, 6... Flange, 5A, 6A...
... End face, 51.61 ... Tsuba accommodation recess, 52.
62...Abutment surface, 7...Tightening tool, 8
...0 ring groove, 9...0 ring. Patent applicant Cosmoeki Co., Ltd. Patent attorney Hitoshi Ikeda

Claims (1)

[Claims] 1. Rubber lining layer (3), (4)'l on the inner surface
In the rubber-lined steel pipe (11, (2)) having metal flanges (51, (411'Y) that abut each other at the ends and are joined by a tool (7), the flanges (61, (6) mutually opposing end surfaces (5
A). (6A) has an annular flange housing recess @(s i
). (61) and the abutting surface (52) connected to the collar housing recess, (
62) are respectively formed and the rubber lining layer (3
). (4) is extended to the flanges accommodating recesses (61), (61) of the flanges (5), (6), and the flanged rubber lining layers (S A), (4A) are formed in close contact with each other. , the brim-shaped rubber lining layer (3A),
One of (4A) is a rubber-lined steel pipe characterized in that an OIJ song groove (8) is provided in the circumferential direction, and an O-ring (9) is fitted into the O-ring groove (8). Joint structure. 2. End face (5A) of flange (5), (6),
The joint structure for rubber-lined steel pipes according to claim 1, wherein fitting parts (53) and (6B) for centripetal alignment are formed in (6A). 3. Rubber lining layer (J, (4), (3A
) and (4A) are urethane rubber, the joint structure for rubber-lined steel pipes according to claim 1 or 2.