JPH059120U - Connection between cable metal cover and joint box - Google Patents

Abstract

(57) [Abstract] [Purpose] A different diameter shape memory alloy joint is used to seal a cable metal cover such as an aluminum cover or a lead cover and a joint box for easy and reliable sealing. [Structure] The shape memory alloy joint (4) is formed inside the shape memory alloy joint (4) in which the cable metal sheath side has a small diameter and the joint box side has a large diameter. The joint between the cable metal cover and the joint box, which is formed by sealing the cable metal cover and the joint box with the applied pressure.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a connection part which uses a shape memory alloy joint to seal a cable metal cover such as an aluminum cover or a lead cover and a joint box (including a copper pipe at the lower part of the termination box), and which can be easily and surely sealed. Is.

[0002]

[Prior art and its problems]

 The seal in the gap between the cable metal cover, such as the aluminum cover or the lead cover, and the joint box is conventionally lead-coated. However, lead workers require many years of training and experience because they require special skills, making it difficult to secure such skilled workers.

The present invention has been made as a result of studying the above-mentioned problems, and does not require special skill such as lead work, and allows easy and reliable connection between a cable metal cover and a joint box. This is a development of the department.

[0004]

[Means for Solving the Problems]

 According to the present invention, the cable metal cover and the joint box are arranged inside a shape memory alloy joint in which the cable metal cover side has a small diameter and the joint box side has a large diameter. It is the connection between the joint box and the metal cover of the cable that seals the joint box.

[0005]

[Action]

 That is, according to the present invention, the original martensite structure on the low temperature side and the austenite structure on the high temperature side, which are the characteristics of shape memory alloys such as Ni-Ti system or Cu-Zn-Al system, are heated and the original structure is heated. Utilizing the property of recovering the shape and contracting, the metal pressure of the aluminum cover or lead cover and the joint box or the lower part copper pipe of the end box are pressed and sealed by the pressurizing force generated at that time. However, since the shape memory joints described above have different outer diameters of the cable metal cover and the joint box, for example, the different diameter shape memory is used in accordance with the outer diameters, for example, the cable metal cover side has a small diameter and the joint box side has a large diameter. Sealing is performed using an alloy joint, so even if the seals have different diameters, they can be easily and reliably sealed. If the metal cover of the above cable is aluminum, apply a band made of semi-transparent aluminum that matches the valley of the corrugate to make the outer diameter smooth and seal. In the present invention, in order to increase the amount of heat shrinkage of the shape memory alloy, it is possible to firmly seal by sealing the inside of the shape memory alloy joint through a liner made of a soft material such as aluminum or copper. Further, by coating the inner circumference of the liner with a thermosetting resin, the gap between the inside of the liner and the seal portion is filled during heating, and the airtightness is further improved. Furthermore, if a temperature-indicating paint is applied to a part of the shape memory alloy joint or liner, the temperature at the time of heating can be known and the connection can be made at an appropriate temperature. Examples of the different diameter shape memory alloy joints include Ni-Ti-based, Cu-Zn-Al-based, Fe-Mn-Co-based, Cu-Zn-based, Cu-Al-based, and other ordinary shape-memory alloys. It can be used and is selected as appropriate according to the condition of the sealing part, heating temperature, etc.

[0006]

【Example】

 An embodiment of the present invention will be described below. Example 1 As shown in FIG. 1, the lead sheath (2) at the tip of the lead sheathed cable (1) and the joint box (3) of the copper pipe at the bottom of the termination box are sealed with the outer diameter of the lead sheath and the joint box. Prepare a different diameter shape memory alloy joint (4) of Cu-Zn-Al alloy that matches the outer diameter, insert copper liners (5) and (6) matching the respective diameters inside this joint, and The different-diameter shape memory alloy joint was inserted and aligned, and the joint was heated and contracted by a burner to pressurize the lead cover and joint box to seal them. The above-mentioned seal portion showed a connection strength similar to that of the conventional lead portion seal portion. Example 2 As shown in FIG. 2, seal the aluminum jacket (8) at the tip of the aluminum jacket cable (7) and the joint box (3) of the lower end copper pipe of the termination box to the outside diameter of the aluminum jacket and the outside of the joint box. Using a different diameter shape memory alloy joint (4) of Cu-Zn-Al alloy that matches the diameter, attach a solder-like aluminum strip (9) along the valley of the corrugated aluminum cover, Insert copper liners (5) and (6) on the outside, insert the above-mentioned different diameter shape memory alloy joints on the outside to align, and heat with a burner to shrink the aluminum cover and joint box. Was pressurized and sealed. The above-mentioned seal portion showed a connection strength similar to that of the conventional lead portion seal portion.

[0007]

[Effect of the device]

 As described above, according to the present invention, it is possible to easily and surely seal the metal cover of the cable and the joint box without requiring special skill, and it has an industrially remarkable effect.

[Brief description of drawings]

FIG. 1 is a sectional view of a connection portion between a cable metal cover and a joint box according to an embodiment of the present invention.

FIG. 2 is a sectional view of a connecting portion between a cable metal cover and a joint box according to an embodiment of the present invention.

[Explanation of symbols]

 1 Lead covered cable 2 Lead covered 3 Joint box 4 Different diameter shape memory alloy joint 5, 6 Liner

Claims (1)

[Claims for utility model registration] [Claim 1] The cable metal cover and the joint box are arranged inside a shape memory alloy joint in which the cable metal cover side has a small diameter and the joint box side has a large diameter. The connection between the cable metal cover and the joint box, which is formed by sealing the cable metal cover and the joint box with the pressure of the joint.