JPH0536195U - Corrosion protection core for pipe joints - Google Patents

Abstract

(57) [Summary] [Purpose] A tubular substrate 5 integrally formed of an elastic material,
The workability of inserting the anticorrosion core having a plurality of annular fins integrally formed on the outer peripheral surface of the cylindrical base body 5 into the joint portion is improved, and the centering can be properly performed. [Structure] A plurality of fins 7A to 7F are formed on the outer periphery of the tubular base body 5 at appropriate intervals in the axial direction, and the fins 7C and 7D on the axial center side extend from the fins 7A and 7F on both ends. The diameters are successively reduced (R3>R2> R1).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an anticorrosion core for pipe joints used for water supply and sewer pipe joints, or for industrial water and chemical solution plant pipe joints.

[0002]

[Prior Art]

 Generally, in pipelines for waterworks, etc., when connecting by inserting the insertion port of the connecting pipe on the adjacent side into the receiving port of the connecting pipe, insert an anticorrosion core into the pipe joint section to prevent corrosion of the inner surface of the pipe. Prevent. FIG. 4 shows a cross-sectional structure of a conventional pipe joint part in which a corrosion-preventing core is mounted. In FIG. 4, 1A and 1B are connecting pipes, and the insertion port 1a of one connecting pipe 1A is the connecting pipe of the other connecting pipe 1B. The pipe joint portion 2 is formed by inserting both of them into the receiving port 1b and 1A and 1B. Reference numeral 3 denotes an anticorrosion core inserted into the pipe joint portion 2. As shown in FIG. 5, the anticorrosion core 3 is a rubber or the like integrally formed on the outer peripheral side of the metal pipe 4 made of SUS or the like. A cylindrical base body 5 made of an elastic material, a collar portion 6 integrally formed on the central outer peripheral surface of the cylindrical base body 5, and a plurality of positions which are located at appropriate intervals in the axial direction of the cylindrical base body 5. And a plurality of annular fins 7 integrally formed on the outer peripheral surface of the tubular substrate 5 toward the outside.

The other end of the above-mentioned anticorrosion core 3 is press-fitted into the inside of the receiving port 1b of the other connecting pipe 1B, while the other end of this core 3 is inserted into the connecting port 1a of the one connecting pipe 1A. By being inserted into the inside of the side by press-fitting, the anticorrosion core 3 is installed inside the pipe joint portion 2 of both the connecting pipes 1A and 1B, where the fins 7 are elastically deformed and the connecting pipes 1A and 1B are connected. Is pressed against the inner surface of the.

[0004]

[Problems to be solved by the device]

 According to the conventional anticorrosion core having the above-described structure, the plurality of fins 7 having the same size are all provided orthogonally to the axial direction, that is, along the radial direction of the tubular base body 5. Therefore, for example, the connecting pipe 1A is inserted. When inserting into the mouth 1a, a large elastic reaction force from the fins 7 acts from the beginning of the insertion, and it is difficult to smoothly insert them while keeping them coaxial with each other, and it takes time for centering. In particular, if the connecting pipes 1A and 1B have small inner diameters due to variations, they may require a large insertion force and may not be easily inserted.

The present invention has been made to solve the above problems, and it is an object of the present invention to provide an anticorrosion core for a pipe joint portion, which can facilitate insertion work and can be properly centered. To aim.

[0006]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a tubular base body integrally formed of an elastic material and fitted on the outer side of a metal tube, and a plurality of locations at appropriate intervals in the axial direction of the tubular base body. An annular fin integrally formed on the outer peripheral surface of the pipe joint part, one end side of which is inserted into the insertion side of the connecting pipe and the other end side of which is inserted into the receiving side of the adjacent connecting pipe in a press-fit state. In the anticorrosion core, the plurality of fins are configured such that their diameters are gradually reduced from the central side in the axial direction to both ends.

[0007]

[Action]

 With the above configuration, when inserting into the connecting pipe, the fins have the smallest outer diameter at the beginning of the insertion, so that the insertion can be performed comfortably, and even if the inner diameter of the connecting pipe is different, the fins corresponding to the inner diameter will be elastic sequentially. The deformability improves the insertability. Further, by using the smallest diameter fins at both ends in the axial direction as the insertion guides, centering can be surely performed.

[0008]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a cross-sectional view and a perspective view, respectively, showing an anticorrosion core of a pipe joint portion according to an embodiment of the present invention, and the same parts as those of the conventional example shown in FIG. The description is omitted.

In FIG. 1 and FIG. 2, 7 (7A, 7B, 7C, 7D, 7E, 7F) are a plurality of annular fins integrally formed on the outer peripheral surface of the rubber cylindrical base body 5. The fins 7 are configured such that the outer diameter dimension R is gradually reduced from the axial center fins 7C, 7D to the axial end fins 7A, 7F (R3> R2> R1).

With the above configuration, the work of inserting both ends of the anticorrosion core 3 into the connecting pipes 1A and 1B in a press-fitted state becomes easy. That is, when inserting the other end of the anticorrosion core 3 into the insertion opening 1a of the connecting pipe 1A in a press-fitted state as shown in FIG. 3, for example, since the diameter R1 of the fin 7A at the end is the smallest, it is not possible at the beginning of insertion. Since it is not necessary to insert it into the insert, the insert workability is improved. Furthermore, by using the fin 7A (7F) having the smallest diameter as a guide for insertion, the centering of the connecting pipe 1A (1B) can be performed accurately. Further, even if the connecting pipes 1A (1B) have different inner diameters, the fins 7 having a diameter corresponding to the inner diameters are elastically deformed, so that the connecting pipes 1A (1B) can be smoothly inserted.

[0011]

[Effect of the device]

 As described above, according to the present invention, the plurality of fins integrally formed on the outer peripheral surface of the tubular base body are gradually reduced in diameter from the central side in the axial direction to both ends. There is an effect that the insertion work becomes very easy and the centering can be properly performed.

[Brief description of drawings]

FIG. 1 is a sectional view showing an anticorrosion core of a pipe joint portion according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an anticorrosion core of a pipe joint portion according to an embodiment of the present invention.

FIG. 3 is an explanatory diagram when inserting the anticorrosion core.

FIG. 4 is a cross-sectional view of a conventional general pipe joint portion in a mounted state of an anticorrosion core.

FIG. 5 is a cross-sectional view showing a conventional corrosion-preventing core of a pipe joint portion.

[Explanation of symbols]

 1A, 1B Connection pipe 1a Insert port 1b Receptacle 2 Pipe joint part 4 Metal pipe 5 Cylindrical base 7A to 7F Fins R1, R2, R3 Fin outer diameter dimension

Claims (1)

[Scope of utility model registration request] 1. A cylindrical base body integrally formed of an elastic material and fitted to the outside of a metal tube, and integrally formed on a plurality of outer peripheral surfaces of the cylindrical base body at appropriate intervals in the axial direction. And an annular fin, one end side of which is inserted into the insertion side of the connecting pipe and the other end of which is inserted into the receiving side of the adjacent connecting pipe in a press-fit state, respectively, in the corrosion preventing core of the pipe joint portion, The core for corrosion protection of a pipe joint part is characterized in that the fins are sequentially reduced in diameter from the center side to both ends in the axial direction.