JPS59113712A - Strengthened resin member joint like cryogenic cable 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 the nlj plan for reinforced resin member joints such as cryogenic cable piping, reduces eddy current loss occurring in piping housing cables, and efficiently transmits large-capacity power. It is designed to ensure that the following is carried out.

Transmitting large amounts of current in power transmission cables 1
One method is to lower the temperature of the metal.

In other words, the phenomenon in which the electrical resistance of metals at low temperatures decreases is applied, and the power transmission cable is immersed in a refrigerant such as liquid oxygen.For example, the power transmission cable is housed inside a steel pipe such as stainless steel, and A refrigerant is placed inside the refrigerant, and in this case, a high degree of insulation is required to prevent the temperature of the refrigerant from rising. However, as a heat insulation method, as shown in FIG. 1, the outside of the power transmission cable 11 and the inner tube 12 containing the refrigerant is surrounded by an outer tube 13, which is a steel tube with a larger diameter, and spacers 16 are appropriately arranged. A method is used that uses heavy pipes and creates a vacuum between the inner pipes.
Furthermore, in order to prevent heat radiation between the inner and outer tubes 12 and 13,
It is also possible to wrap the inner tube 12 in multiple layers with aluminum vapor-deposited mylar 14, or to insert pearlite powder or the like between the inner and outer tubes 12 and 13.

However, when the cable 11 is passed through such a structure and energized, eddy currents are generated inside and outside the cable 112, 13, resulting in a power transmission loss. As shown in FIG. 2, this eddy current loss is generated by the alternating current magnetic field 15 generated by the current flowing through the cable conductor 11, and the loss is proportional to the square of the eddy current density. However, when a large amount of current is passed through a cable that is exposed to extremely low temperatures, the eddy current loss is large. That is, for example, in the above-mentioned one shown in FIG.
When using SGP cable piping in which the outer tube 13 is 40 OA and the outer tube 13 is 40 OA, the conductor resistance RP when power is transmitted under the following conditions is as shown in Table 1 below.

61.2 φ conductor outer diameter 0 Cable stack...Single core cable stacked in 3 strips φ Transmission current...100OA ・Refrigerant...Liquid nitrogen Table 1 Therefore, the vortex generated in the steel pipe at this time The current is the third
As shown in the figure, it is 33.2 (μΩ/rn/3 phase),
Since the resistance is larger than the resistance of the cable itself, it inevitably becomes a big problem.

Therefore, in order to reduce such eddy current loss, the inner tube 12 is made of a conventional SUS tube reinforced by laminating and reinforcing it using glass fiber or the like. The non-magnetic nature of the tube reduces the eddy current loss of the entire tube, and with this method, eddy current is generated only in the outer tube, resulting in a reduction in radial strength of about 6 sides compared to the conventional method. Become. However, when a reinforced resin tube is used as the inner tube in this manner, many problems arise in the expansion and contraction measures and the connection method. In other words, the connection methods for this FRP pipe are as shown in Figure M4, such as using the socket 21 in Figure (4), the village mouth method in Figure (B), and the 7 lunge method in Figure (C). However, no matter which method is used, when the connection is made on-site, there is a problem of nonuniform performance at the connection part, and in particular, there is a disadvantage that the high vacuum cannot be maintained constant over a long period of time. Inside the tsumashi-'i
12 contracts in the axial direction when it is cooled from room temperature to a low temperature, which generates a tensile force in the axial direction, and the linear expansion ratio of the adhesive 25 and the FnP inner tube 12 is different, so the connection is made. Microcracks will occur in the area, resulting in vacuum leakage.

The present invention has been devised after repeated studies in view of the above-mentioned circumstances, and the embodiment thereof will be described with reference to the attached drawings. A cylindrical tube end member 2 made of steel or other material is used at the end of the tube 1, and an annular uneven portion 3 that is uneven in the radial direction is formed on the outer surface of the tube end member 20 on the reinforced resin tube 1 side. For the reinforced resin pipe 1
It is integrally formed by covering and engaging the two. The annular concavo-convex portion 3 described above may be continuous in a spiral or spiral shape depending on the case, and in any case, machining thereof is relatively easy.

By forming a groove 4 on the end surface of the pipe end member 2 that protrudes from the reinforced resin pipe 1, the connection can be made by welding 5 as shown in FIG. 6, and the strength of the connection can be increased. You can get enough. In addition, there is a seventh tube in the middle part of the reinforced resin pipe 1.
As shown in the figure, a bellows 6 for absorbing expansion and contraction can be provided, and even when the bellows 6 is provided in this way, an annular uneven portion 6b is provided at the end of the bellows forming material 6a.
A preferable attachment relationship can be obtained by forming the reinforcing resin material and covering the portion with the reinforcing resin material. Furthermore, the connection with the reinforced resin material T using the uneven portions 6b can also be applied to the connection portion with a plate material such as a flat plate or a curved plate, as shown in FIG. 8, depending on the case. When a steel material such as a steel pipe is used as the tongue end member 2, its linear expansion coefficient is approximately close to that of the reinforced resin pipe 1 such as FRP. 1.
Peeling and cracking between the two can be effectively prevented.

Using the metal end member 2 of the present invention, such as a broken steel pipe, as described above, an annular uneven portion 3 is formed on the reinforced resin pipe 1 side of the member 2, and the reinforced resin # 1 are integrally formed by enclosing and engaging them, it is possible to sufficiently increase the bonding force in the axial direction of both members 1.2, and increase the bonding area between both members 1.2. The product has a structure with excellent sealing properties, and does not show any crack damage even when cooled at low temperatures as described in @.
Therefore, it has the characteristic of not causing vacuum leakage, and it is also possible to connect by welding, resulting in a joint that can be fully reliable from this point of view, and as a result, eddy current loss can be accurately reduced. This invention has effects such as being able to provide cable piping for reduced cryogenic temperatures, and is industrially highly effective.

[Brief explanation of the drawing]

The drawings show the technical content of the present invention, and FIG. 1 is an explanatory diagram of power transmission cable piping using a conventional refrigerant, and FIG.
Figure 3 is an explanatory diagram of the eddy current loss due to the alternating magnetic field, Figure 3 is a diagram showing the thin current loss relationship in the case of a three-strand cable, and Figure 4 is a diagram showing typical examples of conventional reinforced resin pipe joints. 5 is a sectional view showing a joint according to the present invention, and FIG. 6 is a ff of a welded joint.
FIG. 7 is a sectional view showing the Perot X portion, and FIG. 8 is a perspective view showing how the present invention is applied to a plate material. In these drawings, 1 is a reinforced resin pipe, 2 is a shield 1 with a gap, 3 is an annular uneven part, 4 is a groove, 5 is a weld, and 6 is a welded part.
(d' bellows, 6a is the material forming the bellows, and 6b is the annular uneven portion thereof. Patent applicant: Nippon Kokan Co., Ltd. Inventor: Takamasa Matsumoto
Nakamori burial Ogata order -
Nemoto Actual Attorney Patent Attorney Shirakawa --:'1゛-
nido′

Claims (1)

[Claims] 1. Steel 'H' at the end of a reinforced resin member such as reinforced resin 'G'
A metal end member such as the above is used, an uneven part is formed on the outer surface of the metal end member on the side of the reinforced resin member, and the reinforced resin member is covered and engaged with the uneven part to form an integral part. Reinforced resin material joints such as cryogenic cable piping. 2. Reinforced labor member joint portion according to claim 1, wherein both the reinforced resin member and the metallic end member are plate-shaped materials.