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Magnesium oxide powder feeding hopper and copper pipe copper sheath magnesium oxide insulated cable filling method

A technology of magnesium oxide powder and insulating cable, which is used in the manufacture of cables/conductors, insulation of conductors/cables, circuits, etc., can solve the problem of uneven density distribution of magnesium oxide powder, shorten the service life of fireproof cables, and reduce the conductivity of fireproof cables. and other problems, to achieve the effect of improving the resistance to bending and extrusion impact, high hardness, and improving electrical conductivity

Active Publication Date: 2022-07-05
重庆科宝电缆股份有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the magnesium oxide powder always accumulates in the copper tube in a fixed direction in the drainage tube. Due to the barrier effect of the copper core in the copper tube, it is difficult for the existing filling process to distribute the magnesium oxide powder evenly on the copper tube copper protection. In the sleeve, the compactness of the magnesium oxide powder is unevenly distributed, which affects the insulation performance of the cable
At the same time, since the air remains in the copper sheath of the copper tube during the filling process, the oxygen remaining in the air will oxidize with the inner wall of the copper core and the copper sheath of the copper tube during the high-temperature heat treatment process of the two annealings in the later stage. , leading to oxidation and blackening of the inner wall of the copper core and the copper sheath of the copper tube after annealing, reducing the conductivity of the fireproof cable and shortening the service life of the fireproof cable

Method used

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  • Magnesium oxide powder feeding hopper and copper pipe copper sheath magnesium oxide insulated cable filling method
  • Magnesium oxide powder feeding hopper and copper pipe copper sheath magnesium oxide insulated cable filling method
  • Magnesium oxide powder feeding hopper and copper pipe copper sheath magnesium oxide insulated cable filling method

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Embodiment 1

[0030] like figure 1 As shown, the existing filling system has an upper hopper 7, a lower hopper 8, a fixed core tube sleeve 9, a copper core 6, a copper tube copper sheath 5 and a drainage tube, and the upper end of the drainage tube is connected to the discharge port of the lower hopper 8. , the lower end of the drainage tube extends into the copper tube copper sheath 5 rolled with the copper tape 10, the fixed core tube sleeve 9 is located above the lower hopper 8, and the copper core 6 passes through the fixed core tube sleeve 9 and sequentially from the lower hopper 8 , The drainage tube extends into the copper tube copper sheath 5 after passing through, and the magnesium oxide powder is placed in the upper hopper, passes through the upper hopper for first-level buffering, and the lower hopper for second-level buffering, and then enters the drainage tube. The moving speed of the copper tape and the copper core is consistent with the flow rate of the magnesium oxide powder...

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Abstract

The invention discloses a magnesium oxide powder feeding hopper and a copper pipe copper sheath magnesium oxide insulated cable filling method, the feeding hopper comprises a feeding hopper body, the feeding hopper is characterized in that a discharging channel is arranged at a discharging port at the lower end of the feeding hopper body, and shielding gas interlayers communicated with each other are arranged outside the feeding hopper body and the discharging channel; a half of the interlayer of the discharging channel extends downwards to form a semicircular extending part, a protective gas purging hole is formed in the inner side wall of the semicircular extending part, and the bottom end of the semicircular extending part is sealed. The performance of the cable is improved, the compactness is improved, and oxidation is avoided.

Description

technical field [0001] The invention relates to the technical field of cables, in particular to a magnesium oxide powder feeding hopper and a method for filling a copper tube and copper sheathed magnesium oxide insulated cable. Background technique [0002] Mineral insulated fire-resistant cable, called MI cable, referred to as fire-resistant cable, is a high-conductivity copper wire embedded in a tightly compacted magnesium oxide insulating material in a sturdy and tough seamless copper sheath. The cable can still be energized normally for more than 90min under the flame temperature of 950-1000℃. It is mainly used for fire protection system, emergency lighting system, alarm system, automatic fire sprinkler system, personnel evacuation evacuation system (safety door, elevator) Such as high temperature occasions, military facilities and installations and power transmission and distribution lines in riot-proof places, as well as places where the wiring space is relatively narr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/22H01B13/06
CPCH01B13/221H01B13/06Y02A30/14
Inventor 符靓夏世全潘复生黄美华陈先华李建波
Owner 重庆科宝电缆股份有限公司
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