A low voltage switchgear contact protection device

Abstract

The utility model discloses a low -voltage switchgear contact protection device, include: sleeve, sleeve is fixed in the outside of movable contact, and sleeve forms protection to the lower part of movable contact, folding cover is set up in the upper end of sleeve, and folding cover forms protection to the upper part of movable contact, top ring is set up in the upper end of folding cover, and movable contact and static contact combine when top ring is contacted in the contact box end part of static contact and makes folding cover fold. Through the combination design of sleeve and folding cover, the upper part and the lower part of movable contact are all formed effective protection, in the movable contact moving process, sleeve and folding cover can prevent its direct collision or friction with other components in switch cabinet, avoid the scratch, deformation and so on mechanical damage of movable contact surface, thereby guarantee the good contact performance of movable contact and static contact.

Description

Technical Field

[0001] This utility model relates to the technical field of contact protection devices, specifically a contact protection device for low-voltage switchgear. Background Technology

[0002] During the operation of switchgear, the contacts, as critical electrical connection components, directly affect the safe and reliable operation of the switchgear and even the entire power system. Currently, most existing contact protection measures focus on the protection of stationary contacts, typically using contact boxes to protect them. Contact boxes provide a relatively enclosed and insulated environment for stationary contacts, reducing interference and damage from external factors to a certain extent.

[0003] However, due to the lack of corresponding protective devices, moving contacts are prone to the following problems:

[0004] 1. Mechanical damage: During the movement of the moving contact, it may collide or rub against other components in the switch cabinet, resulting in mechanical damage such as scratches and deformation on the surface of the moving contact. This will affect its contact performance with the stationary contact, increase contact resistance, and cause problems such as overheating.

[0005] 2. Dust and foreign object intrusion: The operating environment of the switchgear may contain foreign objects such as dust and metal shavings. These foreign objects can easily adhere to the moving contacts, affecting their conductivity and potentially causing partial discharge, thus threatening the safe operation of the switchgear.

[0006] Therefore, we need to propose a contact protection device for low-voltage switchgear. Utility Model Content

[0007] The purpose of this utility model is to provide a contact protection device for low-voltage switchgear. Through the combination design of sleeve and folding sleeve, it effectively protects both the upper and lower parts of the moving contact. During the movement of the moving contact, the sleeve and folding sleeve can prevent it from directly colliding or rubbing with other components in the switchgear, avoiding mechanical damage such as scratches and deformation on the surface of the moving contact, thereby ensuring good contact performance between the moving contact and the stationary contact, and solving the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A contact protection device for low-voltage switchgear, comprising:

[0010] A sleeve is fixed to the outside of the moving contact, and the sleeve protects the lower part of the moving contact.

[0011] A folding sleeve is provided at the upper end of the sleeve, and the folding sleeve protects the upper part of the moving contact;

[0012] The top ring is located at the upper end of the folding sleeve. When the moving contact and the stationary contact are engaged, the top ring abuts against the end of the contact box of the stationary contact, causing the folding sleeve to fold.

[0013] Preferably, it also includes a bottom ring disposed at the lower end of the sleeve, and mounting holes are equidistantly arranged on the bottom ring for fixing the sleeve to the outside of the moving contact.

[0014] Preferably, it also includes a middle ring, which is disposed between the top ring and the bottom ring. The middle ring is located on the outer wall of the upper end of the sleeve and the lower end of the folding sleeve is fixed to the middle ring.

[0015] Preferably, it also includes an auxiliary structure for assisting the extension and retraction of the folding sleeve, which is disposed between the top ring and the middle ring. The auxiliary structure includes multiple sets of connecting rods, which are equidistantly arranged around the bottom of the top ring.

[0016] Preferably, the connecting rod is slidably inserted into the middle ring, and a limit block is provided at the lower end of the connecting rod. A compression spring is sleeved on the connecting rod between the middle ring and the top ring. When the top ring abuts against the end of the contact box of the stationary contact, the connecting rod slides and the folding sleeve folds. When the moving contact and the stationary contact are disconnected, the compression spring causes the folding sleeve to return to its original position and restore protection to the upper part of the moving contact.

[0017] Preferably, it also includes a dust cover, which is threaded onto the top of the top ring. The outer wall of the dust cover is provided with an external thread section, and the inner wall of the top ring is provided with an internal thread section. The external thread section and the internal thread section are adapted to each other. When the moving contact is disconnected, the dust cover prevents external dust and water stains from contacting the moving contact.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. Through the combined design of the sleeve and folding sleeve, the upper and lower parts of the moving contact are effectively protected. During the movement of the moving contact, the sleeve and folding sleeve can prevent it from directly colliding or rubbing with other components in the switch cabinet, avoiding mechanical damage such as scratches and deformation on the surface of the moving contact. This ensures good contact performance between the moving contact and the stationary contact, reduces contact resistance, reduces the occurrence of heat generation, and improves the operational stability and reliability of the switch cabinet.

[0020] 2. The dust cover is threaded onto the top of the top ring. Utilizing the matching connection of the external and internal thread sections, the dust cover can tightly seal the top of the top ring when the moving contact is disconnected, forming a relatively enclosed space. This effectively prevents external dust, metal shavings, and other foreign objects from adhering to the moving contact, avoiding affecting the conductivity of the moving contact, reducing safety hazards such as partial discharge, and ensuring the safe operation of the switchgear. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the folding sleeve of this utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the dust cover of this utility model.

[0024] In the diagram: 1. Sleeve; 2. Folding sleeve; 3. Bottom ring; 4. Middle ring; 5. Top ring; 6. Connecting rod; 7. Limiting block; 8. Compression spring; 9. Dust cover; 10. Internal thread section; 11. External thread section. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figure 1-2 This utility model provides a technical solution:

[0027] A contact protection device for low-voltage switchgear, comprising:

[0028] Sleeve 1 is fixed to the outside of the moving contact, and sleeve 1 provides protection for the lower part of the moving contact;

[0029] Sleeve 1 is made of ABS engineering plastic and is fixed to the lower part of the moving contact by the bottom ring 3 bolts to form a rigid protective shell that moves synchronously with the moving contact.

[0030] Folding sleeve 2 is provided at the upper end of sleeve 1, and folding sleeve 2 provides protection for the upper part of moving contact;

[0031] The upper end of the folding sleeve 2 is fixed to the top ring 5 and the lower end is fixed to the middle ring 4. The material is silicone rubber (Shore hardness 65±5A). It uses a pleated structure to achieve expansion and contraction. When closing the circuit, the top ring 5 abuts against the end face of the stationary contact box, pushing the folding sleeve 2 to compress and fold. When opening the circuit, the auxiliary structure drives the folding sleeve 2 to unfold.

[0032] The top ring 5 is located at the upper end of the folding sleeve 2. When the moving contact and the stationary contact are engaged, the top ring 5 abuts against the end of the contact box of the stationary contact and causes the folding sleeve 2 to fold.

[0033] The top ring 5 adopts a ring structure and is vulcanized with the upper end of the folding sleeve 2. When it comes into contact with the contact box, the folding sleeve 2 is folded evenly by mechanical pressure to avoid local deformation due to stress.

[0034] In general, sleeve 1 withstands external impacts (such as scraping by the operating mechanism), and folding sleeve 2 buffers the friction between the moving contact and the contact box, reducing the occurrence of surface scratches; folding sleeve 2 automatically adjusts the wrapping state according to the change of the moving contact stroke, and always maintains a certain protective distance during the opening and closing process, blocking the intrusion path of foreign objects.

[0035] For a preferred implementation, please refer to Figure 1-2 It also includes a bottom ring 3, which is located at the lower end of the sleeve 1. The bottom ring 3 has mounting holes equidistantly arranged around it for fixing the sleeve 1 to the outside of the moving contact.

[0036] A ring is positioned at the lower end of the sleeve 1, with mounting holes evenly spaced around it. Fasteners such as bolts pass through these mounting holes to securely fix the sleeve 1 to the outside of the moving contact; this provides a stable mounting base for the sleeve 1, ensuring that it does not loosen or shift during the movement of the moving contact, thus guaranteeing continuous and effective protection of the lower part of the moving contact by the sleeve 1.

[0037] For a preferred implementation, please refer to Figure 1-2 It also includes a middle ring 4, located between the top ring 5 and the bottom ring 3. The middle ring 4 is located on the upper outer wall of the sleeve 1, and the lower end of the folding sleeve 2 is fixed to the middle ring 4. It also includes an auxiliary structure for assisting the extension and retraction of the folding sleeve 2, located between the top ring 5 and the middle ring 4. The auxiliary structure includes multiple sets of connecting rods 6, which are equidistantly arranged around the bottom of the top ring 5. The connecting rods 6 are slidably inserted into the middle ring 4, and the lower end of the connecting rods 6 is provided with a limit block 7. A compression spring 8 is sleeved on the connecting rods 6 between the middle ring 4 and the top ring 5. When the top ring 5 abuts against the end of the contact box of the stationary contact, the connecting rods 6 slide and the folding sleeve 2 folds. When the moving contact and the stationary contact are disconnected, the compression spring 8 causes the folding sleeve 2 to return to its original position and restore protection to the upper part of the moving contact.

[0038] When the top ring 5 abuts against the end of the contact box of the stationary contact, the top ring 5 drives the connecting rod 6 to slide within the middle ring 4, and the compression spring 8 is compressed; when the moving contact and the stationary contact are disconnected, the elastic force of the compression spring 8 pushes the top ring 5 to reset, so that the folding sleeve 2 returns to its original position and restores protection to the upper part of the moving contact.

[0039] In summary, the middle ring 4 provides an installation and support platform for the folding sleeve 2 and auxiliary structures, ensuring the stability of the entire structure;

[0040] Among them, rubber washers are sleeved on both ends of the compression spring 8 on the connecting rod 6, so that the auxiliary structure also plays the role of buffering and resetting. When the moving contact and the stationary contact are engaged, the sliding of the connecting rod 6 and the compression of the compression spring 8 can absorb part of the impact force and reduce the mechanical damage to the moving contact.

[0041] When the moving contact and the stationary contact are disconnected, the spring force of the compression spring 8 causes the folding sleeve 2 to quickly return to its original state, ensuring continuous protection of the upper part of the moving contact, and at the same time restoring the entire device to its initial state, preparing it for the next operation.

[0042] For a preferred implementation, please refer to Figure 1-3 It also includes a dust cover 9, which is threaded onto the top of the top ring 5. The outer wall of the dust cover 9 is provided with an external thread section 11, and the inner wall of the top ring 5 is provided with an internal thread section 10. The external thread section 11 and the internal thread section 10 are matched. When the moving contact is disconnected, the dust cover 9 prevents external dust and water stains from contacting the moving contact.

[0043] When the moving contact is open, the dust cover 9 is installed on the top ring 5; when the moving contact needs to engage with the stationary contact, the dust cover 9 is removed. When the moving contact is open, the dust cover 9 can tightly seal the top of the top ring 5, forming a relatively enclosed space, effectively preventing external dust, water stains, and other foreign objects from entering the protective device, avoiding these foreign objects from adhering to the moving contact, affecting the conductivity of the moving contact, reducing safety hazards such as partial discharge, and ensuring the safe operation of the switchgear. At the same time, the threaded installation method makes the installation and removal of the dust cover 9 convenient and quick, facilitating the maintenance and repair of the moving contact.

[0044] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A contact protection device for low-voltage switchgear, characterized in that, include: Sleeve (1) is fixed to the outside of the moving contact and forms protection for the lower part of the moving contact; A folding sleeve (2) is provided at the upper end of the sleeve (1), and the folding sleeve (2) provides protection for the upper part of the moving contact; The top ring (5) is located at the upper end of the folding sleeve (2). When the moving contact and the stationary contact are engaged, the top ring (5) abuts against the end of the contact box of the stationary contact and causes the folding sleeve (2) to fold.

2. The low-voltage switchgear contact protection device according to claim 1, characterized in that: It also includes a bottom ring (3), which is disposed at the lower end of the sleeve (1). The bottom ring (3) has mounting holes equidistantly arranged around it for fixing the sleeve (1) to the outside of the moving contact.

3. The low-voltage switchgear contact protection device according to claim 2, characterized in that: It also includes a middle ring (4), which is set between the top ring (5) and the bottom ring (3). The middle ring (4) is located on the upper outer wall of the sleeve (1) and the lower end of the folding sleeve (2) is fixed to the middle ring (4).

4. A low-voltage switchgear contact protection device according to claim 3, characterized in that: It also includes an auxiliary structure for assisting the extension and retraction of the folding sleeve (2), which is located between the top ring (5) and the middle ring (4). The auxiliary structure includes multiple sets of connecting rods (6), which are equidistantly arranged around the bottom of the top ring (5).

5. A low-voltage switchgear contact protection device according to claim 4, characterized in that: The connecting rod (6) is slidably inserted into the middle ring (4), and a limit block (7) is provided at the lower end of the connecting rod (6). A compression spring (8) is sleeved on the connecting rod (6) between the middle ring (4) and the top ring (5). When the top ring (5) abuts against the end of the contact box of the stationary contact, the connecting rod (6) slides and the folding sleeve (2) folds. When the moving contact and the stationary contact are disconnected, the compression spring (8) causes the folding sleeve (2) to return to its original position and restore protection to the upper part of the moving contact.

6. A low-voltage switchgear contact protection device according to claim 1, characterized in that: It also includes a dust cover (9), which is threaded onto the top of the top ring (5). The outer wall of the dust cover (9) is provided with an external thread section (11), and the inner wall of the top ring (5) is provided with an internal thread section (10). The external thread section (11) and the internal thread section (10) are adapted to each other. When the moving contact is disconnected, the dust cover (9) prevents external dust and water stains from contacting the moving contact.

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