JPS58511Y2 - Heating lining device for the inner surface of magnetic metal tubes - Google Patents

Description

[Detailed explanation of the invention] Generally, when forming a rubber lining on the inner surface of a tube, first, an unvulcanized rubber layer is usually formed on the inner surface of the tube, and then this is applied to the vulcanized tube. It is then placed in a container and vulcanized.

This method has the disadvantage that the equipment is too advanced, and it is particularly difficult to perform molding on site.

For example, there is a method of lining the pipe with unvulcanized rubber and then filling the pipe with hot water to cure it, but this method is extremely careful.

The present invention is an attempt to overcome such difficulties, and provides a device with a lining layer that can be easily heat-formed and is particularly suitable as a lining layer for the inner surface of a narrow tube.

The outline of the device of the present invention is to layer uncured rubber or uncured resin on the inner surface of a magnetic metal tube such as an iron tube.

Two insulated wires are inserted into the tubular body, each end of which is locally connected to each end of the tubular body to form a circuit, and one circuit includes an AC power source.

3. High-pressure gas is sealed inside the tube. 4. The power is turned on and alternating current is passed through the tube through both local circuits.

At this time, the alternating current flowing through the tube is a skin current flowing through the inner wall of the tube.

It is known that there is a certain relationship between the depth of the skin, the specific resistance of the conductor, the magnetic permeability, the frequency, etc., which are indicators of the range in which the skin effect is strongly manifested, and the inner diameter, thickness, length, etc. of the iron pipe. Patent No. 4602, when certain conditions are given to the iron pipe, the current flowing through the iron pipe is concentrated only on the inner surface of the iron pipe, and no current flows on the outer surface of the pipe or other nearby metal plates, etc.
No. 24 (Japanese Patent Publication No. 40-12128) is known as applying the above phenomenon to a heat-generating tube in ``Transport force method and transportation pipe equipment for viscous liquids or liquids requiring temperature maintenance''.

The present invention corresponds to applying the above phenomenon to solve problems in a new direction, and has the effects as described below with an example of its implementation.

In Fig. KL, 1 is a highly magnetic metal tube such as an iron tube, 2 is an unvulcanized rubber lining layer attached to the inner surface of the tube, and 3 is an insulated wire that penetrates the tube, and its center conductor W is connected to the outside of the tube. 1 local circuit C
1 line segment t□, and the other end is connected to the second local circuit C2.
is connected to one end of line segment t3.

One end of the line segment t2 of the circuit C□ is connected to one end of the tube 1, and an AC power supply S is connected between it and the line segment t1 to form a powerful circuit,
The other end of the line segment t3 of the other end circuit C2 is connected to the other end of the tube 1, thus creating a closed circuit S-t□-Wt3-1-8,
An alternating current is passed through this.

4 and 5 are sealed plugs at both ends of the tube 1, and one of them 4 has a high-pressure gas conduit running through it.

High-pressure gas is introduced through the pipe to fill the pipe, and when the unvulcanized rubber lining layer 2 is kept in close contact with the inner surface of the pipe 1 without voids, the power source C is switched on.

In this way, the current flows through the above-mentioned series circuit, but in the tube 1, the current flows concentrated in the layer very close to the inner surface of the tube as shown by the dotted line, and the Joule heat is transferred to the lining layer 2 closest to the tube. This will result in extremely effective communication.

Even when applying uncured resin instead of the unvulcanized brush coating described above, the heat generation and heating operation 1 is the same for both, and in this way, both vulcanization and thermosetting can be performed with good thermal efficiency. It can be done.

As described above, compared to the conventional method, the present coating apparatus does not require large equipment such as conventional vulcanization (thermosetting) cans.

22 Optimization of the heat transfer efficiency for heating the inning layer is performed.

The 32 innings is placed in close contact with the inner surface of the tube without voids.

4. During the treatment operation of the device, no potential is generated on the surface of the pipe body, so it is safe and suitable for on-site construction.

[Brief explanation of drawings]

The figure is a longitudinal sectional view showing an example of implementing the present invention. 1... Magnetic metal tube, 2... Lining layer, 3... Insulated wire, C work... 1st
Local circuit, C2...Second local circuit, t□*12
+13...Circuit line segment, S...Power supply,
D...High pressure gas conduit.

Claims (1)

[Scope of utility model registration request] An unvulcanized rubber or an uncured range layer is supported under pressure on the inner surface of a metal tube such as an iron tube by filling high pressure gas, and an insulated electric wire is provided to run through the tube, and both ends of the electric wire are pushed out of the tube. A heating lining layer on the inner surface of a magnetic metal tube is characterized in that it has a circuit section connected to the tube itself, and on the other hand, a heating lining layer on the inner surface of a magnetic metal tube is characterized by a scale that uses a skin current flowing through the tube generated by inserting an alternating current power source into the circuit section.