Grounding switch with good contact

Abstract

The utility model discloses a grounding switch with good contact performance, which comprises a base, an insulator fixed on the base, and a rotating shaft rotatably arranged on the base, the insulator is provided with a static contact, an inlet of the static contact is provided with an inclined first guide part, the rotating shaft is provided with a grounding knife, and the grounding knife is provided with a second guide part. The head part of the grounding switch is provided with a first groove, two sides of the first groove are provided with moving contacts which move towards the center in a telescopic manner, an inlet of each moving contact is provided with an inclined second guide part, and the back surface of each moving contact is provided with at least two guide rods which penetrate through the side wall of the first groove. The first guide part is matched with the second guide part to automatically adapt to the distance between the moving contact and the first groove, so that the centering property of the moving contact and the static contact is improved; clamping force for clamping the static contact is formed between the moving contacts through the spring, so that the contact resistance value of the moving contacts and the static contact is reduced, and the product has the advantages of good contact property and good centering property.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, in particular to a grounding switch with good contact performance. Background Art

[0002] A grounding switch is a mechanical grounding device that releases static electricity from the equipment being repaired and the circuits being maintained, as well as ensuring the safety of maintenance personnel during power outages. It can withstand current for a certain period of time under abnormal conditions (such as short circuits), but does not pass load current under normal circumstances. It is typically part of an isolating switch. A grounding switch and isolating switch are often combined into a single device.

[0003] Due to tolerances in the manufacturing of components of the grounding switch, the grounding knife and the static contact are poorly aligned after assembly, which reduces the contact area between the two and increases the contact resistance. Therefore, the applicant has made a beneficial design and found a solution to the above-mentioned problem. The technical solution to be introduced below was developed in this context. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned traditional grounding switch design and provide a product with good contact and good neutrality.

[0005] In order to solve the above problems, the present invention adopts the following technical solutions.

[0006] A grounding switch with good contact performance includes a base, an insulator fixed on the base, and a rotating shaft rotatably arranged on the base, the insulator is provided with a static contact, an inclined first guide portion is provided at the entrance of the static contact, the rotating shaft is provided with a grounding knife, the head of the grounding knife is provided with a first groove, and moving contacts that can be telescopically moved toward the center are provided on both sides of the first groove, an inclined second guide portion is provided at the entrance of the moving contact, at least two guide rods are provided on the back of the moving contact, and pass through the side wall of the first groove, the guide rod is provided with a spring, and abuts the moving contact and the side wall of the first groove, the guide rod is provided with a baffle, and maintains a distance from the outer wall of the grounding knife.

[0007] Preferably, a first countersunk hole is provided on the back side of the moving contact, and inclined surfaces are provided on both sides of the moving contact to form a contact surface.

[0008] Preferably, the first groove is provided with a through hole, and one end of the through hole is provided with a second countersunk hole.

[0009] Preferably, the guide rod is arranged in the first countersunk hole, and the guide rod passes through the through hole.

[0010] Preferably, the spring abuts against the first countersunk hole and the second countersunk hole respectively.

[0011] Beneficial effects:

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] In the present invention, the first guide portion cooperates with the second guide portion, and the spacing between the moving contacts is changed according to the tolerance generated during manufacturing, thereby changing the spacing between the moving contacts and the first groove, thereby improving the centering of the moving contacts and the static contacts; the elastic force released by the spring is applied to the moving contacts, so that a clamping force is formed between the moving contacts to clamp the static contacts, thereby reducing the contact resistance value between the moving contacts and the static contacts, and increasing the contact area between the two, so that the product has the advantages of good contact and good centering. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural diagram of a grounding switch with good contact performance according to the utility model;

[0015] Figure 2 For this utility model Figure 1 A partial enlarged view of a grounding switch with good contact performance;

[0016] Figure 3 This is a schematic cross-sectional view of a grounding switch with good contact performance according to the present invention;

[0017] Figure 4 For this utility model Figure 3 A partial enlarged view of a grounding switch with good contact performance B;

[0018] Figure 5 This is a structural diagram of a moving contact of a grounding switch with good contact performance according to the utility model;

[0019] The corresponding relationship between the illustration labels and component names in the figure is as follows:

[0020] Figure numerals: 1. base; 2. insulator; 3. rotating shaft; 4. static contact; 5. grounding knife; 6. moving contact; 7. guide rod; 8. spring; 9. baffle; 41. first guide part; 51. first groove; 52. through hole; 53. second countersunk hole; 61. second guide part; 62. first countersunk hole; 63. inclined surface; 64. contact surface. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "left" and "right" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0023] In the embodiments of the present invention, "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0024] Reference example Figures 1 to 5 , a grounding switch with good contact performance, including a base 1, an insulator 2 fixed on the base 1, and a rotating shaft 3 rotatably set on the base 1, the insulator 2 is provided with a static contact 4, the entrance of the static contact 4 is provided with an inclined first guide portion 41, the rotating shaft 3 is provided with a grounding knife 5, the head of the grounding knife 5 is provided with a first groove 51, and both sides of the first groove 51 are provided with a moving contact 6 that can be telescoped toward the center, and an inclined second guide portion 61 is provided at the entrance of the moving contact 6. At least two guide rods 7 are provided on the back of the moving contact 6, and pass through the side wall of the first groove 51. The guide rod is provided with a spring 8 and abuts against the moving contact 6 and the side wall of the first groove 51. The guide rod 7 is provided with a baffle 9 and maintains a distance from the outer wall of the grounding knife 5. The baffle 9 limits the moving contact 6 to the first The distance of the telescopic movement in the middle of the groove 51, the distance maintained between the baffle 9 and the outer wall of the grounding knife 5 is consistent with the distance between the first guide part 41, so that the second guide part 61 can smoothly abut the first guide part 41. As the grounding knife 5 rotates, the second guide part 61 abuts the first guide part 41. As the moving contact 6 gradually enters the static contact 4, the distance between the moving contacts 6 moves toward the side wall of the first groove 51 according to the tolerance generated during manufacturing, thereby compressing the spring 8, causing it to store energy and release the elastic force, so that a clamping force is formed between the moving contact 6 and the static contact 4, thereby reducing the contact resistance value between the moving contact 6 and the static contact 4 and increasing the contact area between the two. The above design effectively improves the centering between the moving contact 6 and the static contact 4;

[0025] It is worth mentioning that a first countersunk hole 62 is provided on the back of the moving contact 6, and inclined surfaces 63 are provided on both sides of the moving contact 6 to form a contact surface 64. The first countersunk hole 62 increases the total height of the spring 8 and improves the elastic coefficient of the spring 8. The elastic force of the spring 8 is concentrated here through the contact surface 64, thereby increasing the close fit between the moving contact 6 and the static contact 4, effectively reducing the contact resistance value and reducing the heat generation;

[0026] It is worth mentioning that the first groove 51 is provided with a through hole 52, and a second countersunk hole 53 is provided at one end of the through hole 52. The through hole 52 provides a guide for the guide rod 7, and the second countersunk hole 53 increases the total height of the spring 8 and improves the elastic coefficient of the spring 8.

[0027] It is worth mentioning that the guide rod 7 is disposed in the first countersunk hole 62 and passes through the through hole 52;

[0028] It is worth mentioning that the spring 8 abuts against the first countersunk hole 62 and the second countersunk hole 53 respectively.

[0029] The above design scheme can enable the product to achieve the advantages of good contact and good centering.

[0030] The above content is a further detailed description of the present invention in combination with specific implementation methods. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, they can make several simple deductions or substitutions without departing from the concept of the present invention, which should be regarded as falling within the scope of protection determined by the claims submitted for the present invention.

Claims

1. A grounding switch with good contact performance, comprising a base (1), an insulator (2) fixed to the base (1), and a rotating shaft (3) rotatably arranged on the base (1), characterized in that: The insulator (2) is provided with a static contact (4), an inclined first guide portion (41) is provided at the entrance of the static contact (4), the rotating shaft (3) is provided with a grounding knife (5), a head of the grounding knife (5) is provided with a first groove (51), both sides of the first groove (51) are provided with moving contacts (6) that can be telescoped toward the center, an inclined second guide portion (61) is provided at the entrance of the moving contact (6), at least two guide rods (7) are provided on the back of the moving contact (6) and pass through the side wall of the first groove (51), the guide rods are provided with springs (8) and abut against the moving contact (6) and the side wall of the first groove (51), the guide rods (7) are provided with a blocking piece (9) and maintain a distance from the outer wall of the grounding knife (5).

2. The grounding switch with good contact according to claim 1, characterized in that: A first countersunk hole (62) is provided on the back of the moving contact (6), and inclined surfaces (63) are provided on both sides of the moving contact (6) to form a contact surface (64).

3. The grounding switch with good contact according to claim 2, characterized in that: The first groove (51) is provided with a through hole (52), and one end of the through hole (52) is provided with a second countersunk hole (53).

4. The grounding switch with good contact according to claim 3, characterized in that: The guide rod (7) is arranged in the first countersunk hole (62), and the guide rod (7) passes through the through hole (52).

5. The grounding switch with good contact according to claim 4, characterized in that: The spring (8) abuts against the first countersunk hole (62) and the second countersunk hole (53) respectively.

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