A mine explosion-proof integrated static contact box

Abstract

The utility model relates to the technical field of mining explosion -proof high -voltage switch equipment, especially a mining explosion -proof integrated static contact box, including the insulation body of insulating material one -off forming, fixedly be equipped with the explosion -proof mounting flange for realizing the explosion -proof connection of the mounting hole of intermediate partition on high -voltage combined power supply equipment in the middle part mounting position of the insulation body, the insulation body right side is equipped with circuit breaker static contact mounting cavity and earthing trolley static contact mounting cavity respectively, the inside fixed covering of the insulation body has built -in connection copper bar, built -in connection copper bar in the insulation body is used for realizing the electrical connection between the wiring end of circuit breaker static contact mounting cavity and earthing trolley static contact mounting cavity. The utility model's built -in connection copper bar is completely covered in the insulating material, and the wiring end of circuit breaker static contact mounting cavity and earthing trolley static contact mounting cavity is respectively formed reliable electrical connection in the insulation body, and the reliability and security of connection are improved.

Description

Technical Field

[0001] This utility model relates to the technical field of explosion-proof high-voltage switchgear for mining, and in particular to an integrated static contact box for explosion-proof mining. Background Technology

[0002] In environments with explosive gases, such as coal mines, explosion-proof high-voltage vacuum power distribution equipment is a key component for ensuring power supply safety. This type of equipment typically employs a handcart-type circuit breaker structure for ease of inspection and maintenance.

[0003] However, in mine explosion-proof high-voltage combined vacuum power distribution equipment, the internal circuit breaker compartment, busbar compartment and wiring compartment are extremely small due to the limited size of the explosion-proof enclosure; the compact structural design places stringent requirements on the electrical clearance between the internal components.

[0004] In the prior art, the stationary contacts of the circuit breaker load end and the grounding switch end are usually installed through a separate contact box, and the conductor short-circuit point connected to the busbar is often exposed in the wiring cavity.

[0005] The above structure has significant defects: within the limited explosion-proof space, the exposed connecting conductors occupy a large amount of space, making it difficult for the electrical clearance and creepage distance between charged bodies at the same or different potentials to meet the requirements of mining explosion-proof standards such as GB3836. This poses a risk of phase-to-phase or phase-to-ground short circuits due to insufficient insulation, seriously threatening the safety of mine power supply.

[0006] Therefore, there is an urgent need to develop a static contact box specifically for explosion-proof switchgear used in mines, which can effectively solve the insulation problem in confined spaces while ensuring electrical performance. Utility Model Content

[0007] This utility model aims to overcome the problem of insufficient electrical clearance in the wiring cavity caused by exposed conductor short-circuit points in the prior art, and provides a mine explosion-proof integrated static contact box. The contact box completely covers the conductor short-circuit points with insulating material, eliminating the risk of exposure and meeting explosion-proof requirements.

[0008] To solve one of the aforementioned technical problems, the specific technical solution adopted is as follows: a mine-use explosion-proof integrated static contact box, comprising an insulating body formed in one piece from insulating material, an explosion-proof mounting flange fixedly provided at the middle mounting position of the insulating body for explosion-proof connection with the mounting hole of the middle partition on the high-voltage combined power supply equipment, and a circuit breaker static contact mounting cavity and a grounding trolley static contact mounting cavity respectively provided on the right side of the insulating body; the interior of the insulating body is fixedly covered with an internal connecting copper busbar, which provides electrical connection between the terminals of the insulating body used to realize the wiring between the circuit breaker static contact mounting cavity and the grounding trolley static contact mounting cavity.

[0009] Based on any of the above technical solutions, a further optimization is made: the circuit breaker stationary contact mounting cavity is used to connect with the fluid-conducting part of the matching circuit breaker stationary contact and to enclose it inside the insulating body to achieve external insulation.

[0010] Based on any of the above technical solutions, a further optimization is made: the grounding truck stationary contact mounting cavity is used to connect with the fluid-conducting part of the matching grounding truck stationary contact and to enclose it inside the insulating body to achieve external insulation.

[0011] Based on any of the above technical solutions, a further optimization is made to: protrude to the left on the upper left side of the insulating body and form a first corrugated annular structure evenly spaced along its axial direction on the outer surface of its cylindrical section.

[0012] Based on any of the above technical solutions, a further optimization is made to form a second corrugated annular structure evenly spaced along its axial direction on the outer surface of the cylindrical section of the insulating body outside the circuit breaker stationary contact mounting cavity and the grounding trolley stationary contact mounting cavity.

[0013] Based on any of the above technical solutions, a further optimization is made: the wiring terminals of the built-in connecting copper busbar and the circuit breaker stationary contact mounting cavity and the grounding trolley stationary contact mounting cavity are all electrically connected by welding or integral forging.

[0014] Based on any of the above technical solutions, a further optimization is made: the first corrugated annular structure is an annular protrusion structure with alternating peaks and troughs, and the depth of the troughs is consistent with the height of the peaks.

[0015] Based on any of the above technical solutions, the following further optimization is made: the second corrugated annular structure is an annular protrusion structure with alternating peaks and troughs, and the depth of the troughs is consistent with the height of the peaks.

[0016] Based on any of the above technical solutions, a further optimization is made of reinforced epoxy resin or DMC / SMC molding compound.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This contact box completely covers the conductor short-circuit points with insulating material, which greatly eliminates the risk of exposed discharge at critical connection points. It features a compact structure and excellent insulation performance, and can meet the strict safety standards of explosion-proof mining environments.

[0018] 2. The structure of this utility model transfers the short-circuit conductors that occupy space in the traditional busbar cavity to the inside of the contact box to complete the connection, which greatly frees up the busbar cavity space and ensures electrical clearance and creepage distance. It is especially suitable for explosion-proof high-voltage combined power supply equipment for mining.

[0019] 3. The built-in connecting copper busbar of this utility model is completely covered in the insulating material. Its two ends are respectively connected to the wiring terminals of the circuit breaker stationary contact mounting cavity and the grounding trolley stationary contact mounting cavity inside the insulating body, forming a reliable electrical connection, replacing the traditional exposed connecting conductor, and improving the reliability and safety of the connection.

[0020] 4. The inherent safety of this utility model is improved: the short-circuit point of the conductor that is prone to electrical clearance problems is completely sealed in a high-strength insulating material, which completely eliminates the risk of discharge in the narrow explosion-proof cavity, and the insulation performance is significantly better than that of the split structure.

[0021] 5. The structure of this utility model is highly compact: the integrated design integrates a multi-functional unit, which significantly saves the internal space of the high-voltage combined power supply equipment, and is especially suitable for the harsh space environment of mining explosion-proof environment.

[0022] 6. Meets explosion-proof standards: The optimized shape and corrugated ring structure design effectively increase the creepage distance; the explosion-proof mounting flange ensures a reliable explosion-proof connection with the cabinet, and the overall structure complies with the relevant standards for explosion-proof electrical equipment in mining.

[0023] 7. High reliability and easy installation: As a pre-assembled unit, it avoids complex on-site conductor connection operations, reduces installation errors, improves equipment consistency and reliability, and facilitates use and maintenance in harsh environments such as coal mines. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, the elements or components are not necessarily drawn to scale.

[0025] Figure 1 This is a schematic diagram of the internal cross-sectional structure of this utility model.

[0026] Figure 2 This is a schematic diagram of the installation state structure of this utility model.

[0027] In the diagram: 1. Insulation body; 2. Circuit breaker stationary contact mounting cavity; 3. Grounding trolley stationary contact mounting cavity; 4. Internal connecting copper busbar; 5. Explosion-proof mounting flange; 6. First corrugated ring structure; 7. Intermediate partition; 8. Second corrugated ring structure. Detailed Implementation

[0028] The embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of the present utility model, and are therefore merely examples and should not be construed as limiting the scope of protection of the present utility model. The specific structure of the present utility model is as follows: Figures 1-2 As shown in the image.

[0029] Example 1: A mine explosion-proof integrated static contact box includes an insulating body 1 formed in one piece from insulating material. An explosion-proof mounting flange 5 is fixedly provided at the middle mounting position of the insulating body 1 for explosion-proof connection with the mounting hole of the middle partition 7 on the high-voltage combined power supply equipment. The right side of the insulating body 1 is provided with a circuit breaker static contact mounting cavity 2 and a grounding trolley static contact mounting cavity 3 respectively. The interior of the insulating body 1 is fixedly covered with an internal connecting copper busbar 4, which is used to realize the electrical connection between the wiring terminals of the insulating body 1 for circuit breaker static contact mounting cavity 2 and grounding trolley static contact mounting cavity 3.

[0030] The explosion-proof mounting flange 5 on one side of the housing is precision machined to ensure that the mating surface with the intermediate partition 7 meets the requirements for explosion-proof clearance and width.

[0031] The integrated, one-piece molded insulation body 1 has no splicing gaps, avoiding the problems of excessive explosion-proof gaps and sealing failures caused by poor splicing in split structures, further improving the stability of explosion-proof protection and reducing the risk of explosion.

[0032] The built-in connecting copper busbar 4 is completely encased inside the insulation material, replacing the traditional exposed connecting conductor. This not only avoids the space occupied by exposed conductors, but also optimizes the overall layout of the insulation body 1, so that the electrical clearance between the circuit breaker stationary contact mounting cavity 2, the grounding trolley stationary contact mounting cavity 3 and the surrounding components naturally meets the standards, without the need for additional splicing space, perfectly adapting to the compact installation requirements of mining switchgear.

[0033] The copper busbar is completely encased and fixed by the insulating body 1, with no room for loosening or displacement. It can withstand the vibration and impact during the transportation and operation of mining equipment, ensuring long-term stable electrical connection and avoiding terminal detachment and short circuit accidents caused by vibration.

[0034] Based on any of the above technical solutions, a further optimization is made: the circuit breaker stationary contact mounting cavity 2 is used to connect with the fluid-conducting part of the matching circuit breaker stationary contact and enclose it inside the insulating body 1 to achieve external insulation.

[0035] Based on any of the above technical solutions, a further optimization is made: the grounding handcart stationary contact mounting cavity 3 is used to connect with the fluid-conducting part of the matching grounding handcart stationary contact and to cover the inside of the insulating body 1 to achieve external insulation.

[0036] It should be noted that this optimization solution addresses the problem that existing split contact boxes are prone to insufficient electrical clearance in the confined space of mine explosion-proof switchgear. This contact box adopts an integrated insulating body 1, which completely encapsulates the fluid conductor connecting the circuit breaker stationary contact and the grounding trolley stationary contact inside the insulating material, replacing the exposed connecting conductor.

[0037] The dual mounting cavities (circuit breaker stationary contact mounting cavity 2 and grounding trolley stationary contact mounting cavity 3) are dedicated positioning structures. The stationary contact can be accurately positioned and electrically connected simply by inserting it, without the need for additional alignment adjustments. During operation and maintenance, it is convenient to plug and unplug the stationary contact to replace it, reducing equipment downtime for maintenance.

[0038] Based on any of the above technical solutions, a further optimization is made of the insulating body 1, which is made of reinforced epoxy resin or DMC / SMC molding compound.

[0039] The insulating body 1 is made of reinforced epoxy resin or DMC / SMC molding compound in one molding process. This type of material has the characteristics of arc resistance, high temperature resistance, impact resistance, moisture resistance and dust adhesion prevention. It can withstand the harsh working conditions of dampness, dust and vibration in coal mines and avoid leakage risks caused by insulation aging and cracking.

[0040] The built-in connecting copper busbar 4 forms a fixed electrical connection with the double mounting cavity terminal, and the copper busbar is completely covered by insulating material with no exposed conductive parts. On the one hand, it eliminates short circuit accidents caused by accidental contact by personnel or foreign objects, and on the other hand, it avoids the conductive parts from being corroded and oxidized by moisture and dust, thus extending the service life of the insulation and conductive structure.

[0041] Example 2: Compared with Example 1, this example also includes the following technical features: Based on any of the above technical solutions, a further optimization is made to: protrude to the left on the upper left side of the insulating body 1 and form a first corrugated annular structure 6 on the outer surface of its cylindrical section, which is evenly spaced along its axial direction.

[0042] It should be noted that the first corrugated ring structure 6 in this optimization scheme can effectively block the creepage path between the left protruding part and the adjacent grounding component (or low voltage area).

[0043] Based on any of the above technical solutions, a further optimization is made to form a second corrugated annular structure 8 on the outer surface of the cylindrical section of the insulating body 1 outside the circuit breaker stationary contact mounting cavity 2 and the grounding trolley stationary contact mounting cavity 3, which is evenly spaced along its axial direction.

[0044] The second corrugated annular structure 8 is designed to address the creepage risk between the high-voltage stationary contact in the circuit breaker stationary contact mounting cavity 2, the grounding stationary contact in the grounding trolley stationary contact mounting cavity 3, and the explosion-proof shell (or other grounding components) outside the insulation body 1. Through a dense alternating peak-valley structure, the leakage current conducted by the high-voltage stationary contact to the outer surface of the insulation body 1 through the inner wall of the mounting cavity needs to travel sequentially along the side and bottom of each corrugation. Compared to a smooth cylindrical surface, the basic length of the creepage distance is extended, meeting the safety standards for creepage distance of mining high-voltage equipment, while avoiding the risk of creepage breakdown caused by the superposition of electric fields between the two mounting cavities.

[0045] The parameter differences between the first corrugated ring structure 6 and the second corrugated ring structure 8 are based on conventional design of the voltage level, spacing between adjacent components and electric field distribution in their corresponding regions.

[0046] During installation, the explosion-proof mounting flange 5 is fastened to the intermediate partition plate 7 with bolts to form an explosion-proof connection. The circuit breaker stationary contact and the grounding trolley stationary contact are respectively inserted into the circuit breaker stationary contact mounting cavity 2 and the grounding trolley stationary contact mounting cavity 3, and the matching external busbar is connected to the external wiring terminals of the circuit breaker stationary contact mounting cavity 2 and the grounding trolley stationary contact mounting cavity 3.

[0047] Based on any of the above technical solutions, a further optimization is made: the wiring terminals of the built-in connecting copper busbar 4 and the circuit breaker stationary contact mounting cavity 2 and the grounding handcart stationary contact mounting cavity 3 are all electrically connected by welding or integral forging.

[0048] It should be noted that the insulating body 1 in this invention is molded from explosion-proof epoxy resin that is resistant to electric arc, high temperature, and high strength. The built-in connecting copper busbar 4 is pre-installed and completely encapsulated during molding, and its two ends are welded to the bottom terminals of the circuit breaker stationary contact mounting cavity 2 and the grounding trolley stationary contact mounting cavity 3, respectively, to form a low-resistance path.

[0049] Based on any of the above technical solutions, a further optimization is made: the first corrugated annular structure 6 is an annular protrusion structure with alternating peaks and troughs, and the depth of the troughs is consistent with the height of the peaks.

[0050] Based on any of the above technical solutions, the following further optimization is made: the second corrugated annular structure 8 is an annular protrusion structure with alternating peaks and troughs, and the depth of the troughs is consistent with the height of the peaks.

[0051] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model. For those skilled in the art, any alternative improvements or transformations made to the implementation of this utility model fall within the protection scope of this utility model.

[0052] Any aspects of this utility model not described in detail are known to those skilled in the art.

Claims

1. A mine explosion-proof integrated static contact box, characterized in that: The device includes an insulating body formed from insulating material in one piece. An explosion-proof mounting flange is fixedly provided at the central mounting location of the insulating body for explosion-proof connection with the mounting holes of the intermediate partition on a high-voltage combined power supply equipment. The right side of the insulating body is respectively provided with a circuit breaker stationary contact mounting cavity and a grounding trolley stationary contact mounting cavity. An internally fixed copper busbar is encased within the insulating body, providing electrical connection between the terminals of the insulating body used to achieve the connection between the circuit breaker stationary contact mounting cavity and the grounding trolley stationary contact mounting cavity.

2. The mine explosion-proof integrated static contact box according to claim 1, characterized in that: The circuit breaker stationary contact mounting cavity is used to connect with the fluid-conducting part of the matching circuit breaker stationary contact and to enclose it inside the insulating body to achieve external insulation.

3. A mine explosion-proof integrated static contact box according to claim 2, characterized in that: The grounding handcart stationary contact mounting cavity is used to connect with the fluid-conducting part of the matching grounding handcart stationary contact and to enclose it inside the insulating body to achieve external insulation.

4. A mine explosion-proof integrated static contact box according to claim 3, characterized in that: The upper left side of the insulating body protrudes to the left and forms a first corrugated ring structure evenly spaced along its axial direction on the outer surface of its cylindrical section.

5. A mine explosion-proof integrated static contact box according to claim 4, characterized in that: A second corrugated annular structure is formed on the outer surface of the cylindrical section of the insulating body outside the stationary contact mounting cavity of the circuit breaker and the stationary contact mounting cavity of the grounding trolley. The corrugated annular structure is evenly spaced along its axial direction.

6. A mine explosion-proof integrated static contact box according to claim 5, characterized in that: The wiring terminals of the built-in connecting copper busbar and the circuit breaker stationary contact mounting cavity and the grounding trolley stationary contact mounting cavity are all electrically connected by welding or integral forging.

7. A mine explosion-proof integrated static contact box according to claim 6, characterized in that: The first corrugated annular structure is an annular protrusion structure with alternating peaks and troughs, and the depth of the troughs is consistent with the height of the peaks.

8. A mine explosion-proof integrated static contact box according to claim 7, characterized in that: The second corrugated annular structure is an annular protrusion structure with alternating peaks and troughs, and the depth of the troughs is consistent with the height of the peaks.

9. A mine explosion-proof integrated static contact box according to claim 8, characterized in that: The insulating body is made of reinforced epoxy resin or DMC / SMC molding compound.

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