An impact-resistant vibration arc-extinguishing chamber structure

Abstract

This invention discloses an impact-vibration resistant arc-extinguishing chamber structure, comprising an arc-extinguishing grid, a support plate assembly, an arc-extinguishing mesh, and a cover plate. The arc-extinguishing grid and the arc-extinguishing mesh are mounted on the support plate assembly, which is then fixed to the cover plate with screws. The arc-extinguishing chamber structure of this invention uses a tension conversion structure and a wear-resistant design at the connection between the arc-extinguishing grid and the support plate assembly, ensuring an interference fit allowance between the two, thereby enhancing the impact and vibration resistance of the arc-extinguishing chamber and the circuit breaker.

Description

Technical Field

[0001] This invention belongs to the field of low-voltage electrical technology, specifically relating to an impact-vibration extinguishing chamber structure. Background Technology

[0002] Frame circuit breakers are a common type of high-current short-circuit protection device in electrical engineering. In the DC field, the metal grid arc-extinguishing chamber is the core component of the arc-extinguishing system of the frame circuit breaker and is the main influencing factor that determines the arc-extinguishing breaking capacity of the circuit breaker.

[0003] Due to the vigorous development of the shipbuilding industry in recent years, frame-type circuit breakers have been widely used in ship electric propulsion systems. Due to the special nature of their operating environment, the ability to resist shock and vibration has become a key assessment requirement for frame-type circuit breakers.

[0004] Metal grid-type arc-extinguishing chambers present numerous challenges in shock and vibration resistance design due to their large size and high external insulation requirements. Existing arc-extinguishing chambers of this type often use gas-generating insulating structural components as supports for the metal grids, which are then installed on the circuit breaker via high-strength insulating connectors. However, friction between the two insulating components due to impact and vibration continuously reduces the fit allowance, potentially damaging the support structure and causing hazards. Summary of the Invention

[0005] The purpose of this invention is to overcome the problem that the metal grid arc-extinguishing chamber of existing frame circuit breakers is difficult to fix with an insulating structure or the fixing method is unstable. It provides an arc-extinguishing chamber structure that is resistant to impact and vibration. This arc-extinguishing chamber structure uses a specially designed stress transfer structure and wear-resistant installation method to improve the stability of the interfaces of each component in the arc-extinguishing chamber, thereby enhancing the impact and vibration resistance of the arc-extinguishing chamber and the circuit breaker.

[0006] The technical solution adopted by this invention to solve its technical problem is: an impact-vibration extinguishing chamber structure, including an arc-extinguishing grid and an arc-extinguishing mesh installed above the arc-extinguishing grid via a support plate assembly. A cover plate is provided above the support plate assembly. The support plate assembly includes an SMC material support plate adapted to the shape of the cover plate. A square groove adapted to the shape of the arc-extinguishing mesh is formed on the support plate for embedding the arc-extinguishing mesh. A frame plate extending around the square groove and hook blocks embedded in the outer wall of the frame plate extend from the bottom of the support plate. The arc-extinguishing grid includes stacked grid sheets, melamine clamping plates at both ends of the grid sheets, and inner and outer pressure strips riveted to the bottom of the clamping plates to support the grid sheets. The support plate and hook blocks are molded using a staggered, interlocking thermoplastic process. A cavity for accommodating the hook blocks is formed on the outer wall of the frame plate, with the bottom of the cavity... An outwardly protruding boss is formed, and a through hole is provided on the upper side of the hook block. The bottom end of the hook block is an outwardly protruding inner boss, forming an S-shaped tension conversion structure. The thickness Z of the inner boss is 1.8mm, and the distance Y to the grid plate should be greater than half of the electrical clearance requirement of the circuit breaker to prevent the arc from crossing the inner boss. The through hole is filled with SMC material of the support plate, and the impact on the upper surface of the inner boss is transferred through the material-filled through hole. The outer boss and the inner boss have the same shape to form a boss group. The height difference Dd between the boss group and the clamping plate is ≥0.5mm. The clamping plate is provided with a slot for inserting the boss group. When the arc extinguishing grid is installed on the support plate assembly, the top side of the slot and the upper surface of the outer boss are interference fit, with an interference amount of 0.2~0.5mm, to reduce the friction generated during vibration.

[0007] The aforementioned impact-vibration extinguishing chamber structure has a boss group width that is between 2 and 4 times the sum of the grid thickness and the spacing.

[0008] The aforementioned impact-vibration extinguishing chamber structure has hook blocks made of wear-resistant, non-magnetic hard brass H62Y or stainless steel 1Cr18Ni9Ti, with sandblasting and knurling treatment on the upper surface.

[0009] The aforementioned impact-vibration extinguishing chamber structure has a boss assembly inserted into a bayonet to form a riveting connection, and the riveting position is an interference fit.

[0010] Compared with existing known technologies, the technical solution provided by this invention has the following significant effects: The arc-extinguishing chamber structure of this invention uses metal materials as a transition at the contact surfaces of the two insulating components and optimizes the stress distribution of the internal components, thereby improving the stability of the interfaces between the components in the arc-extinguishing chamber and enhancing the impact and vibration resistance of the arc-extinguishing chamber and the circuit breaker. This invention, through a specially designed stress transfer structure and wear-resistant installation method, improves the stability of the interfaces between the components in the arc-extinguishing chamber, thereby enhancing the impact and vibration resistance of the arc-extinguishing chamber and the circuit breaker. Attached Figure Description

[0011] Figure 1 This is an isometric view of the present invention;

[0012] Figure 2 This is an isometric view of the arc-extinguishing grid in this invention;

[0013] Figure 3 This is a schematic diagram of the support plate assembly in this invention;

[0014] Figure 4 This is a cross-sectional view of the support plate assembly in this invention;

[0015] Figure 5 yes Figure 4 Enlarged view of section A;

[0016] Figure 6 This is a side view of the support plate in this invention;

[0017] Figure 7 This is a top view of the support plate in this invention;

[0018] Figure 8 This is a perspective view of the hook block in this invention;

[0019] Figure 9 This is a side view of the hook block in this invention;

[0020] Figure 10 This is a cross-sectional view of the interior of this invention.

[0021] The reference numerals in the attached figures are as follows: 1—arc extinguishing grid, 11—clamping plate, 111—bayonet, 111a—top side, 12—grid plate, 13—inner pressure strip, 14—outer pressure strip, 2—support plate assembly, 21—support plate, 211—square groove, 212—outer boss, 22—hook block, 221—through hole, 222—inner boss, 222a—upper surface, 3—arc extinguishing grid, 4—cover plate. Detailed Implementation

[0022] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings.

[0023] Reference Figure 1 and Figure 2 As shown, the present invention discloses an impact-vibration resistant arc-extinguishing chamber structure, comprising an arc-extinguishing grid 1, a support plate assembly 2, an arc-extinguishing mesh 3, and a cover plate 4. The arc-extinguishing grid 1 includes a clamping plate 11, a grid sheet 12, an inner pressure strip 13, and an outer pressure strip 14. The clamping plate 11 is a melamine board with a thickness d; the inner pressure strip 13 and the outer pressure strip 14 are riveted to the clamping plate 11 to support the grid sheet 12.

[0024] Reference Figure 3As shown, the support plate assembly 2 includes a support plate 21 made of SMC material. The support plate 21 has a square groove 211, into which an arc-suppressing mesh 3 is embedded. A cover plate 4 is fixed to the support plate assembly 2 with screws. The bottom of the support plate 21 extends a frame plate surrounding the square groove 211 and hook blocks 22 embedded in the outer wall of the frame plate. The hook blocks 22 are made of hard brass H62Y or stainless steel 1Cr18Ni9Ti.

[0025] Reference Figure 4 and Figure 5 As shown, the support plate 21 and the hook block 22 are molded using a staggered embedding thermoplastic process. The outer wall of the frame plate has a cavity to accommodate the hook block 22. An outwardly protruding outer boss 212 is formed at the bottom of the cavity. A through hole 221 is provided on the upper side of the hook block 22. The bottom end of the hook block 22 is an outwardly protruding inner boss 222, forming an S-shaped tension conversion structure. The through hole 221 is filled with SMC material of the support plate 21. The impact on the upper surface 222a of the inner boss 222 is transferred through the material-filled through hole 221. The outer boss 212 and the inner boss 222 have the same shape and are integrated into one piece, forming a boss group (212+222) with two layers of bosses. The height difference Dd between the boss assembly and the clamping plate 11 is at least 0.5mm. The clamping plate 11 is provided with a slot 111 for inserting the boss assembly (212+222). When the arc extinguishing grid 1 is installed on the support plate assembly 2, the top side 111a of the slot 111 and the upper surface 222a of the outer boss 212 are interference fit with an interference amount of 0.2~0.5mm to reduce friction generated during vibration.

[0026] Reference Figures 6 to 9 As shown, the boss assembly (212+222) is inserted into the bayonet 111 to form a riveting connection. When the riveting is completed, the top side 111a of the bayonet 111 and the upper surface 222a of the boss 222 are in an interference fit. The interference amount is in the range of 0.2mm to 0.5mm, and can be 0.3mm.

[0027] Reference Figure 10 As shown, the thickness of the grid plate 12 is h, the spacing is H, the thickness of the boss 222 is 1.8mm, and the distance Y from the grid plate 12 should be greater than half of the required electrical clearance value of the circuit breaker to prevent the electric arc from crossing the boss 222; the width X of the boss group (212+222) should not be less than 2h+2H to prevent the ejected electric arc from short-circuiting multiple grid plates 12.

[0028] The embodiments are merely illustrative of the principles and effects of the present invention. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of the present invention, and these modifications and improvements are all within the scope of protection of the present invention.

Claims

1. A shock-vibration resistant arc-extinguishing chamber structure, characterized in that: The system includes an arc-extinguishing grid (1) and an arc-extinguishing mesh (3) installed above the arc-extinguishing grid (1) via a support plate assembly (2). A cover plate (4) is provided above the support plate assembly (2). The support plate assembly (2) includes an SMC material support plate (21) adapted to the cover plate (4). A square groove (211) adapted to the arc-extinguishing mesh (3) is provided on the support plate (21). A frame plate extending around the square groove (211) and a hook block (22) embedded in the outer wall of the frame plate extend from the bottom of the support plate (21). The hook block (22) is made of hard brass H62Y or stainless steel 1Cr18Ni9Ti and is sandblasted and knurled on its upper surface (222a). The arc-extinguishing grid (1) includes stacked grid plates (12), clamping plates (11) provided at both ends of the side of the grid plates (12), and inner pressure strips (13) and outer pressure strips (14) riveted to the bottom of the clamping plates (11). The frame plate outer wall The wall has a cavity for accommodating the hook block (22), and an outwardly protruding outer boss (212) is formed at the bottom of the cavity. A through hole (221) is provided on the upper side of the hook block (22), and an outwardly protruding inner boss (222) is formed at the bottom of the hook block (22). The distance from the inner boss (222) to the grid plate (12) is greater than half of the electrical clearance value of the circuit breaker. The through hole (221) is filled with SMC material. The outer boss (212) and the inner boss (222) form a boss. The height difference between the boss group and the clamping plate (11) is ≥0.5mm. The width of the boss group is between 2 and 4 times the sum of the thickness and spacing of the grid plate (12). The clamping plate (11) is provided with a slot (111) for inserting the boss group. The boss group is inserted into the slot (111) to form a riveting. The riveting position is an interference fit. The top side (111a) of the slot (111) and the upper surface (222a) of the inner boss (222) are an interference fit.

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