An arc-damping shield insulation structure with flexible partitions

Abstract

This utility model relates to an arc-shielding shield insulation structure with a flexible partition, comprising an arc-shielding shield, one side of which is connected to a switchgear. Multiple external terminals are connected to the switchgear. The upper sidewall of the arc-shielding shield has an arc-shielding shield mounting groove, which is located between adjacent external terminals. The switchgear also has a switchgear mounting groove. The arc-shielding shield insulation structure further includes a flexible partition, one side of which has a first fixing part and a second fixing part. The first fixing part is embedded in the arc-shielding shield mounting groove, and the second fixing part is embedded in the switchgear mounting groove. Compared with the prior art, this utility model can undergo elastic deformation to absorb energy when subjected to short-circuit electrodynamic impact of external terminals, avoiding rigid fracture and forming phase-to-phase insulation between adjacent external terminals.

Description

Technical Field

[0001] This utility model relates to the field of plastic-cased circuit breakers, and in particular to an arc-damping insulation structure with a flexible partition. Background Technology

[0002] Molded case circuit breakers typically have a zero-arc shield installed at their external terminals to further prevent arcing when the internal arc-extinguishing grid fails to completely extinguish the interrupted arc, thus preventing phase-to-phase short circuits. However, in actual operation, when the circuit breaker encounters a large short-circuit current, the external terminals may experience violent swinging or displacement under the strong electrodynamic force, directly impacting the phase-to-phase insulation wall of the zero-arc shield. This impact can easily cause the insulation wall of the shield to crack, deform, or even detach. Once the phase-to-phase insulation wall is damaged, the zero-arc shield will lose its ability to block arcing, and the splashed arc may short-circuit adjacent external terminals, causing a phase-to-phase short circuit fault, ultimately rendering the circuit breaker unable to effectively protect downstream circuits.

[0003] Existing technology CN209747432U proposes to seal the gaps between the phase-to-phase insulating partitions of the circuit breaker body and the arc-blocking enclosure with an elastic insulating filling structure or elastic connector to prevent arc escape. However, this technology still uses a rigid partition structure. When the external terminal block is displaced by electrodynamic force, the elastic filling material cannot absorb enough impact energy, and the rigid partition is also at risk of being broken by impact, thus losing its insulation function.

[0004] The existing technology CN209641617U divides the chamber into an anti-ionization chamber and an external busbar chamber by using an insulating plate inside the arc-isolating cover to isolate the arc from the busbar. However, its insulating plate is a fixed rigid component. If the external busbar swings significantly under the action of a short-circuit current, it may still impact and damage the insulating plate, leading to phase-to-phase insulation failure.

[0005] Therefore, existing zero-arc flash enclosures still have significant shortcomings in terms of mechanical impact resistance and insulation reliability. Utility Model Content

[0006] The purpose of this utility model is to overcome the defects of the existing technology and provide an arc-damping shield insulation structure with flexible partitions. When subjected to short-circuit electrodynamic impact of the external connection, it can undergo elastic deformation to absorb energy, avoid rigid breakage, and form phase-to-phase insulation between adjacent external connections.

[0007] The objective of this utility model can be achieved through the following technical solutions:

[0008] This utility model provides an arc-shielding cover insulation structure with a flexible partition, including an arc-shielding cover, one side of which is connected to a switchgear, and multiple external connection bars are connected to the switchgear. The upper sidewall of the arc-shielding cover is provided with an arc-shielding cover mounting groove, which is located between adjacent external connection bars.

[0009] The switching device is provided with a switching device mounting slot;

[0010] The arc-blocking shield insulation structure also includes a flexible partition. A first fixing part and a second fixing part are respectively provided on one side of the flexible partition. The first fixing part is embedded in the arc-blocking shield mounting groove, and the second fixing part is embedded in the switchgear mounting groove.

[0011] Furthermore, the flexible partition is perpendicular to the arrangement direction of the outer rows, thereby forming an isolation barrier between the outer rows.

[0012] Furthermore, the flexible partition is used for phase-to-phase insulation between adjacent external terminals.

[0013] Furthermore, the flexible partition includes a flexible partition body and a flexible partition protrusion connected to the flexible partition body.

[0014] More preferably, the flexible partition body and the flexible partition protrusion connected to the flexible partition body form an L-shaped plate, and the protrusion is used to extend forward and make an interference fit with the switchgear mounting groove.

[0015] Furthermore, the flexible partition body and the flexible partition protrusion connected to the flexible partition body are integrally formed structures.

[0016] Furthermore, the first fixing part is located on one side of the flexible partition body, and the second fixing part is located on one side of the protruding part of the flexible partition.

[0017] Furthermore, the first fixing part is a protrusion connected to one side of the flexible partition body;

[0018] The second fixing part is a protrusion that is connected to one side of the protrusion of the flexible partition.

[0019] Furthermore, the arc-blocking cover is provided with a positioning groove at the position between adjacent outer rows, and the flexible partition is inserted and limited in the positioning groove.

[0020] Furthermore, the side of the flexible partition body and the protrusion is used for positioning groove insertion matching to further fix the flexible partition body. This insertion fit is also an interference fit.

[0021] Furthermore, the first fixing part and the second fixing part are respectively interference-fitted with the arc-shielding cover mounting groove and the switch equipment mounting groove.

[0022] Furthermore, the cross-sections of the first fixing part and the second fixing part are trapezoidal, triangular, or rectangular;

[0023] The cross-sectional shapes of the arc-shielding cover mounting groove and the switchgear mounting groove are respectively matched with the first fixing part and the second fixing part.

[0024] Furthermore, the flexible partition is made of plastic.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] This invention integrates the first fixing part of the flexible partition with the arc-damping cover mounting groove and the second fixing part with the switchgear mounting groove, forming an elastic isolation barrier by vertical insertion between adjacent external terminals. This structure can elastically deform to absorb energy and prevent rigid breakage when subjected to short-circuit electrodynamic impacts on the external terminals; it can also quickly reset after the impact disappears, continuously maintaining the integrity of phase-to-phase insulation. This completely solves the defect in existing technologies where rigid insulation walls are easily damaged by impacts, leading to arcing and short-circuit failure. It constitutes phase-to-phase insulation between adjacent external terminals, significantly improving the operational reliability and service life of the circuit breaker. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the assembly of the arc-blocking shield and the flexible partition.

[0028] Figure 2 This is a schematic diagram of the assembly of the arc-blocking plate through the first fixing part;

[0029] Figure 3 This is a schematic diagram of the assembly of the arc-blocking plate through the second fixing part;

[0030] Figure 4 This is a schematic diagram of the positioning groove;

[0031] Figure 5 This is a schematic diagram of the external connector assembly.

[0032] In the diagram: 1. Arc shield; 11. Positioning groove; 12. Arc shield mounting groove; 2. Flexible partition; 21. First fixing part; 22. Second fixing part; 3. Switchgear; 31. Switchgear mounting groove; 4. External connection bar. Detailed Implementation

[0033] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Component models, material names, connection structures, circuit structures, control methods, algorithms, and other features not explicitly described in this technical solution are considered common technical features disclosed in the prior art.

[0034] Example 1

[0035] In this embodiment, the arc-damping shield insulation structure with a flexible partition is described in [reference]. Figure 1 , 2 Specifically, the structure includes an arc-shielding cover 1, one side of which is connected to a switchgear 3. Multiple external connection bars 4 are connected to the switchgear 3. An arc-shielding cover mounting groove 12 is provided on the upper sidewall of the arc-shielding cover 1, located between adjacent external connection bars 4. A switchgear 3 has a switchgear mounting groove 31. The arc-shielding cover insulation structure also includes a flexible partition 2, one side of which has a first fixing part 21 and a second fixing part 22. The first fixing part 21 is embedded in the arc-shielding cover mounting groove 12, and the second fixing part 22 is embedded in the switchgear mounting groove 31.

[0036] In practice, the flexible partition 2 is perpendicular to the arrangement direction of the outer rows 4, thereby forming an isolation barrier between the outer rows 4. The flexible partition 2 is used for phase-to-phase insulation between adjacent outer rows 4.

[0037] In specific implementation, the flexible partition 2 includes a flexible partition body and a flexible partition protrusion connected to the flexible partition body. The flexible partition body and the flexible partition protrusion connected to the flexible partition body form an L-shaped plate, and the protrusion is used to extend forward and interfere with the switchgear mounting groove 31. The flexible partition body and the flexible partition protrusion connected to the flexible partition body are integrally formed structures.

[0038] In a specific implementation, the first fixing part 21 is provided on one side of the flexible partition body, and the second fixing part 22 is provided on one side of the protruding part of the flexible partition. The first fixing part 21 is a protruding strip connected to one side of the flexible partition body; the second fixing part 22 is a protruding strip connected to one side of the protruding part of the flexible partition.

[0039] In specific implementation, the first fixing part 21 and the second fixing part 22 are respectively interference-fitted with the arc-shielding cover mounting groove 12 and the switchgear mounting groove 31. The cross-section of the first fixing part 21 and the second fixing part 22 is trapezoidal, triangular or rectangular; the cross-sectional shapes of the arc-shielding cover mounting groove 12 and the switchgear mounting groove 31 are matched with the first fixing part 21 and the second fixing part 22 respectively.

[0040] In terms of specific material selection, the flexible partition 2 is made of plastic.

[0041] In practice, the first fixing part 21 and the second fixing part 22 can be integrally formed with the flexible partition body and the flexible partition protrusion, respectively.

[0042] This embodiment employs an L-shaped flexible partition 2, integrally molded from plastic. Its first fixing part 21 is interference-fitted with the arc-damping cover mounting groove 12, and its second fixing part 22 is interference-fitted with the switchgear mounting groove 31. It is vertically inserted between adjacent external terminals 4 to form an elastic isolation barrier. This structure can elastically deform to absorb energy when subjected to the short-circuit electrodynamic impact of the external terminals, preventing rigid breakage. After the impact disappears, it can quickly reset, continuously maintaining the integrity of the phase-to-phase insulation. This completely solves the defect in existing technologies such as CN209747432U and CN209641617U, where the rigid insulation wall is easily damaged by impact, leading to arcing and short-circuit failure. This significantly improves the operational reliability and service life of the circuit breaker.

[0043] Example 2

[0044] In this embodiment, see Figure 4 The arc-blocking cover 1 has a positioning groove 11 at the position corresponding to the adjacent outer row 4, and the flexible partition 2 is inserted and limited in the positioning groove 11. The side between the flexible partition body and the protrusion is used for the positioning groove 11 for insertion and matching, so as to further fix the flexible partition body. This insertion fit is also an interference fit.

[0045] In this embodiment, the flexible partition 2 is interference-fitted with the positioning groove 11 on the arc shield 1 through the side edge formed between its flexible partition body and the protrusion. This forms a continuous, uninterrupted elastic insulation barrier between adjacent external connecting bars 4, and the positioning groove 11 is used to limit and fix the flexible partition body for a second time. This allows the flexible partition 2 to elastically absorb energy and automatically reset without displacement when subjected to short-circuit electrodynamic impacts from the external connecting bars, thereby maintaining the reliability of phase-to-phase insulation for a long time and significantly improving the operational safety of the circuit breaker.

[0046] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. An arc-shielding shield insulation structure with a flexible partition, comprising an arc-shielding shield (1), one side of which is connected to a switchgear (3), wherein the switchgear (3) is connected to a plurality of external terminals (4), characterized in that, The upper side wall of the arc shield (1) is provided with an arc shield mounting groove (12), and the arc shield mounting groove (12) is located between adjacent outer rows (4); The switchgear (3) is provided with a switchgear mounting slot (31); The arc-blocking shield insulation structure also includes a flexible partition (2). A first fixing part (21) and a second fixing part (22) are respectively provided on one side of the flexible partition (2). The first fixing part (21) is embedded in the arc-blocking shield mounting groove (12), and the second fixing part (22) is embedded in the switchgear mounting groove (31).

2. The arc shield insulation structure with flexible spacer according to claim 1, characterized in that, The flexible partition (2) is perpendicular to the arrangement direction of the outer row (4), thereby forming an isolation barrier between the outer rows (4).

3. The arc shield insulation structure with flexible spacer according to claim 1, characterized in that, The flexible partition (2) is used for phase-to-phase insulation between adjacent external blocks (4).

4. The arc shield insulation structure with flexible spacer according to claim 1, characterized in that, The flexible partition (2) includes a flexible partition body and a flexible partition protrusion connected to the flexible partition body.

5. An arc chute insulating structure with flexible barrier according to claim 4, characterized in that, The first fixing part (21) is provided on one side of the flexible partition body, and the second fixing part (22) is provided on one side of the protruding part of the flexible partition.

6. The arc shield insulation structure with flexible spacer according to claim 1, characterized in that, The first fixing part (21) is a protrusion that is connected to one side of the flexible partition body; The second fixing part (22) is a protrusion that is connected to one side of the protrusion of the flexible partition.

7. The arc shield insulation structure with flexible spacer according to claim 1, characterized in that, The arc shield (1) is provided with a positioning groove (11) corresponding to the position between the adjacent outer row (4), and the flexible partition (2) is inserted and limited in the positioning groove (11).

8. The arc shield insulation structure with flexible spacer according to claim 1, characterized in that, The first fixing part (21) and the second fixing part (22) are respectively interference-fitted with the arc shield mounting groove (12) and the switch equipment mounting groove (31).

9. The arc shield insulation structure with flexible spacer according to claim 1, wherein The cross-sections of the first fixing part (21) and the second fixing part (22) are trapezoidal, triangular, or rectangular; The cross-sectional shapes of the arc shield mounting groove (12) and the switchgear mounting groove (31) are respectively matched with the first fixing part (21) and the second fixing part (22).

10. The arc shield insulation structure with flexible spacer according to claim 1, characterized in that, The flexible partition (2) is made of plastic.

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