Totally enclosed low voltage contact structure

Abstract

The application discloses a fully-closed low-voltage contact structure, which comprises a conductive flexible strip, a sealing rubber sleeve, a conical contact, a pressing pad, a conductive copper strip and a fastening screw, and the contact surface is completely enclosed in the sealing rubber sleeve and is completely isolated from the external environment, so that the contact can be used in an acid and alkali environment, is protected from corrosion by corrosive gas and pollution by dust, oil stains and the like. The design is simple in structure, convenient to install and good in sealing performance, effectively solves the problem of the anti-pollution of the contact system and meets the requirement of the reliable operation of the contact system of the low-voltage and high-current switch device in the electrolytic smelting environment.

Description

Technical Field

[0001] This invention belongs to the field of low-voltage electrical technology and relates to a fully enclosed contact system structure for low-voltage high-current switching equipment. Background Technology

[0002] Low-voltage, high-current switches are widely used in electrolytic smelting of copper, aluminum, nickel, and other metals. These applications typically require the switches to continuously carry tens of thousands of amperes of rated current, and their operational reliability directly affects the stability, energy consumption, and safety of the entire smelting production line.

[0003] However, the environment in the electrolytic smelting workshop is extremely harsh, posing a severe challenge to the switchgear, especially its core contact system, mainly in the following aspects.

[0004] 1. Strong corrosiveness: The electrolysis process will release a large amount of acidic gases (such as sulfuric acid mist) or alkaline aerosols. These corrosive media diffuse in the air and cause continuous erosion of the exposed metal contact surface, resulting in rapid oxidation and sulfidation of the contact material surface, forming a high resistivity compound film, which causes a sharp increase in contact resistance.

[0005] 2. Severe Pollution: The production environment contains a large amount of conductive dust (such as metal dust and carbon powder) and non-conductive dust. At the same time, oil mist and grease generated from the lubrication of mechanical equipment easily adhere to the contact surface. These contaminants accumulate on the contact surface, not only physically hindering direct metal-to-metal contact, but also carbonizing when energized, further increasing contact resistance.

[0006] 3. High temperature and high humidity: Electrolytic cells usually operate in a high temperature environment. The high temperature and humidity in the workshop accelerate the chemical corrosion and oxidation process of the contacts.

[0007] Due to the combined effects of the aforementioned factors, existing conventional exposed or semi-enclosed contact structures reveal fatal flaws. This invention aims to solve this technical problem by providing a low-cost, high-reliability contact enclosure solution specifically designed for harsh industrial environments. Summary of the Invention

[0008] To address the requirements of corrosion resistance and pollution oxidation resistance for low-voltage, high-current switching equipment in electrolytic smelting environments, this invention patent provides a structure for low-voltage, high-current switching equipment that employs an elastic rubber sleeve for sealing and a silver-based contact structure. This invention is achieved through the following technical solution.

[0009] The technical solution adopted by this invention to solve its technical problem is: a fully enclosed low-voltage contact structure, including contacts and conductive flexible busbars or conductive copper busbars connected to the contacts, and a retractable sealing sleeve. There are two contacts arranged opposite to each other, each with a large-diameter conical bottom with a conductive end face and a small-diameter conical top with a countersunk hole for mounting threads. The conical bottom and the conical top form a cup-shaped conical contact structure. The conical bottoms of the two contacts are movably disposed in the sealing sleeve and sealed and wrapped by the sealing sleeve. A protrusion surrounds the outer edge of the conical bottom. The inner wall of the sealing sleeve is provided with a groove that matches the protrusion. The protrusion and the groove are sealed and fixed. The conductive flexible busbar or conductive copper busbar is fixedly installed between the conical bottom and the conical top.

[0010] The aforementioned fully enclosed low-voltage contact structure has its conductive flexible busbar or conductive copper busbar fixedly mounted on the top of the cone by pressure pads and fastening screws.

[0011] The aforementioned fully enclosed low-voltage contact structure has a conductive flexible busbar with a conical hole adapted to the outer surface of the contact cone, and the inner wall of the conical hole is provided with a countersunk platform adapted to the sealing sleeve.

[0012] The aforementioned fully enclosed low-voltage contact structure has a conductive copper busbar with a conical hole adapted to the outer surface of the contact cone, and the inner wall of the conical hole is provided with a countersunk platform adapted to the sealing sleeve.

[0013] The aforementioned fully enclosed low-pressure contact structure has a centrally symmetrical sealing sleeve.

[0014] The aforementioned fully enclosed low-voltage contact structure has a conductive end face made of silver or silver-plated copper.

[0015] The aforementioned fully enclosed low-voltage contact structure has its conductive flexible busbar ends welded together, and the conductive copper busbar is made of copper substrate.

[0016] The beneficial effects of this invention are:

[0017] The conductive flexible busbar and conductive copper busbar of the present invention are fixedly installed on the top of the cone of the contact by pressure pads and fastening screws, and are sleeved on the outside of the matching cone surface of the contact by the cone hole dug out at the end of the busbar, while the contact surface of the contact is completely sealed by the sealing rubber sleeve.

[0018] This design features a simple structure, convenient installation, and good sealing, effectively solving the problem of anti-contamination in the contact system and meeting the requirements for reliable operation of the contact system of low-voltage, high-current switching equipment in the electrolytic smelting environment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the contact structure of the present invention in the closed state;

[0020] Figure 2This is a schematic diagram of the contact structure of the present invention in the open state.

[0021] The labels on the attached drawings are as follows: 1—conductive flexible busbar, 2—sealing sleeve, 3—contact, 4—pressure pad, 5—conductive copper busbar, 6—fastening screw. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings. The embodiments are illustrated in the drawings, and the same reference numerals denote the same elements. The embodiments described below are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0023] Reference Figure 1 , Figure 2 As shown, the present invention discloses a fully enclosed low-voltage contact structure, including a conductive flexible busbar 1, a rubber sealing sleeve 2, a contact 3, a pressure pad 4, a conductive copper busbar 5, and a fastening screw 6.

[0024] There are two contacts 3 arranged opposite each other. Each has a large-diameter conical bottom with a conductive end face and a small-diameter conical top with a threaded mounting countersunk hole. The threaded hole can be directly machined onto the copper substrate or a steel wire thread insert can be used to increase or decrease strength. The conical bottom and the conical top form a cup-shaped conical contact structure. The outer edge of the conical bottom is surrounded by a protrusion, and the inner wall of the sealing sleeve 2 is provided with a groove that matches the protrusion. The sealing sleeve 2 has a centrally symmetrical structure, and the conical bottoms of both contacts 3 are movably disposed within the sealing sleeve 2 and sealed and enclosed by the sealing sleeve 2.

[0025] The conductive flexible busbar 1 is fixedly installed on the top of the cone by pressure pad 4 and fastening screw 6. At the same time, the conductive flexible busbar 1 has a conical hole that is adapted to the outer surface of the cone of the contact 3. The inner wall of the large diameter end of the conical hole is provided with a countersunk platform that is adapted to the local protrusion at the end of the sealing sleeve 2. The countersunk platform and the local protrusion are sealed and fixed by a snap-fit.

[0026] The conductive copper busbar 5 is fixedly installed on the top of the cone by pressure pad 4 and fastening screw 6. At the same time, the conductive copper busbar 5 has a conical hole that is adapted to the outer surface of the cone of the contact 3. The inner wall of the large diameter end of the conical hole is provided with a countersunk platform that is adapted to the local protrusion at the end of the sealing sleeve 2. The countersunk platform and the local protrusion are sealed and fixed by a snap-fit.

[0027] The conductive flexible busbar 1 and conductive copper busbar 5 have tapered holes at their ends. The contact surface between the contact 3 and the conductive flexible busbar 1 and conductive copper busbar 5 is a tapered surface that is compatible with the contact 3, and the large-diameter end has a countersunk feature. It is fixed by pressure pad 4 and fastening screw 6. After fixing, there is a gap t between the pressure pad 4 and the top end face of the cone. This distance is used to meet the installation of the cup-shaped cone structure contact 3 and the tapered hole of the conductive flexible busbar 1 / conductive copper busbar 5. The contact surfaces of the two contacts 3 are completely sealed and enclosed in the cavity of the sealing sleeve 2, avoiding contamination of the contacts 3 by the harsh environment.

[0028] The conductive flexible busbar 1 and the conductive copper busbar 5 are fixedly installed on the top of the cone of the contact 3 by the pressure pad 4 and the fastening screw 6. The cone hole dug out at its end is fitted outside the matching cone surface of the contact 3. The above parts cooperate with each other to form a sealing structure that envelops the conductive surface of the contact 3.

[0029] The end face material can be silver or silver-plated copper, with a raised outer edge. The conductive flexible busbar 1 is a flexible connection, with its ends fused and welded together. The conductive copper busbar 5 is made of copper substrate.

[0030] The shapes illustrated in this specification are exemplary. Changing the shape of certain parts can achieve the same effect as this patent, and this should not be construed as a limitation of the invention.

Claims

1. A fully enclosed low-voltage contact structure, comprising a contact (3) and a conductive flexible busbar (1) or conductive copper busbar (5) connected to the contact (3), characterized in that: It also includes a sealing sleeve (2), and there are two contacts (3) arranged opposite to each other. Each contact has a cone bottom with a conductive end face and a cone top with a mounting hole. The cone bottoms of the two contacts (3) are both located inside the sealing sleeve (2). The cone bottoms are surrounded by protrusions. The inner wall of the sealing sleeve (2) is provided with a groove that matches the protrusions. The conductive flexible busbar (1) or conductive copper busbar (5) is fixedly installed between the cone bottom and the cone top.

2. The fully enclosed low-voltage contact structure according to claim 1, characterized in that, The conductive flexible busbar (1) or conductive copper busbar (5) is fixedly installed on the top of the cone by pressure pads (4) and fastening screws (6).

3. The fully enclosed low-voltage contact structure according to claim 2, characterized in that, The conductive flexible busbar (1) has a conical hole adapted to the outer surface of the contact (3), and the inner wall of the conical hole is provided with a recessed platform adapted to the sealing sleeve (2).

4. The fully enclosed low-voltage contact structure according to claim 2, characterized in that, The conductive copper busbar (5) has a conical hole that is adapted to the outer surface of the contact (3), and the inner wall of the conical hole is provided with a recess that is adapted to the sealing sleeve (2).

5. A fully enclosed low-voltage contact structure according to claim 1, 2, 3, or 4, characterized in that, The sealing sleeve (2) has a symmetrical structure.

6. The fully enclosed low-voltage contact structure according to claim 5, characterized in that, The conductive end face is made of silver or silver-plated copper.

7. The fully enclosed low-voltage contact structure according to claim 5, characterized in that, The conductive flexible busbar (1) is welded at the end, and the conductive copper busbar (5) is made of copper substrate.

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