High-voltage grounding switch

Abstract

The utility model discloses a high-voltage grounding switch, which comprises a supporting base, an insulator and a rotating shaft are arranged on the supporting base, a static contact is arranged at the top of the insulator, a grounding switch elastically connected with the supporting base is fixedly arranged on the rotating shaft, a contact part protruding outwards is arranged at the side part of the static contact, and the grounding switch is arranged on the rotating shaft. The grounding switch is in contact with the contact part, a contact groove which transversely penetrates through the static contact is arranged above the contact part, and a contact plate which is inserted into the contact groove in an attached mode is further arranged at the top of the grounding switch. The high-voltage grounding switch has the beneficial effects that compared with the conventional high-voltage grounding switch, the contact area between the grounding knife and the static contact is increased, the contact resistance between the grounding knife and the static contact is reduced, and the occurrence of poor contact conditions is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of earthing switches, and specifically relates to a high-voltage earthing switch. Background Technique

[0002] A high-voltage earthing switch is a mechanical earthing device that releases the static charge of the equipment and circuit to be overhauled and ensures the personal safety of maintenance personnel during power outage maintenance. It can withstand current for a certain period of time under abnormal conditions (such as short circuit), but does not pass load current under normal conditions, and it is usually one of the components of a high-voltage switch cabinet.

[0003] A high-voltage earthing switch usually includes a static contact and an earthing knife. After the earthing knife is driven by a toggle arm, it contacts the static contact. When the earthing knife is in the earthed state, the static contact is also always in the earthed state to ensure the safety of the high-voltage switch cabinet.

[0004] However, for the existing high-voltage earthing switch, its static contact contacts the earthing knife through a protruding part, and the overall contact area is small, resulting in a large contact resistance. It is not easy to quickly conduct the current on the static contact to the ground. At the same time, the small contact area also makes it easy to have poor contact between the earthing knife and the static contact, affecting the normal use of the earthing switch. Summary of the Invention

[0005] For the existing high-voltage earthing switch, the contact area between its static contact and the earthing knife is small, resulting in a large contact resistance. It is not easy to quickly conduct the current on the static contact to the ground, and it is easy to have poor contact. To solve this problem, the following utility model is proposed:

[0006] A high-voltage earthing switch includes a support base. An insulator and a rotating shaft are provided on the support base. A static contact is provided at the top of the insulator. An earthing knife elastically connected to the support base is fixedly provided on the rotating shaft. A contact part protruding outward is provided on the side of the static contact. The earthing knife contacts the contact part. A contact groove penetrating the static contact horizontally is provided above the contact part. A contact plate is also provided at the top of the earthing knife and is fitted and inserted into the contact groove. The contact plate contacts the earthing knife, greatly increasing the contact area between the two.

[0007] Contact parts protruding outward are provided on both sides of the static contact. The earthing knife includes a first knife plate and a second knife plate. The first knife plate and the second knife plate respectively contact a contact part. A plurality of mating teeth are provided on the top of each of the first knife plate and the second knife plate. The mating teeth on the two knife plates are meshed to form a contact plate. The earthing knife is not integrally formed, which is convenient for assembly.

[0008] It further includes a crank arm fixedly connected to the rotating shaft. The grounding knife is fixedly connected to the crank arm. The crank arm is elastically connected to the support base through a spring. After the crank arm rotates, the spring contracts or expands.

[0009] A push plate is also fixedly connected to the crank arm. One end of the spring is connected to the support base, and the other end is connected to a spring seat. A connecting shaft rotatably connected to the crank arm is provided on the spring seat, and the end of the connecting shaft is also drivingly connected to the push plate.

[0010] Vertical guide grooves are provided on the first knife plate and the second knife plate. An installation hole is provided in the middle of the guide groove, and a pin sleeve partially fitting with the first knife plate and the second knife plate is penetrated in the installation hole.

[0011] A retaining ring is fixedly provided at each end of the pin sleeve. A plurality of disc springs sleeved on the pin sleeve are provided inside the retaining ring, and the innermost disc spring also presses against the first knife plate or the second knife plate inward.

[0012] The present utility model provides a high-voltage grounding switch. The biggest difference between it and the existing high-voltage grounding switch is that a contact groove is provided on its static contact head. The contact knife is composed of a first knife plate and a second knife plate. Matching teeth are provided at the tops of the two. After the matching teeth are engaged with each other, a contact plate is formed. The contact plate contacts the contact groove to increase the contact area between the contact knife and the static contact head, reduce the contact resistance, and reduce the condition of poor contact between the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0014] Figure 2 is a three-dimensional structural schematic diagram of the static contact head in the present utility model;

[0015] Figure 3 is a three-dimensional structural schematic diagram of the grounding knife in the present utility model.

[0016] The corresponding relationship between the reference numerals and the component names in the drawings is as follows:

[0017] 1. Support base; 2. Rotating shaft; 3. Crank arm; 4. Grounding knife; 5. Guide groove; 11. Insulator; 12. Static contact head; 31. Spring seat; 32. Spring; 33. Push plate; 34. Connecting shaft; 41. First knife plate; 42. Second knife plate; 43. Contact part; 44. Contact groove; 45. Contact plate; 46. Matching teeth; 47. Matching groove; 51. Installation hole; 52. Pin sleeve; 53. Retaining ring; 54. Disc spring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The technical solutions of the present utility model will be clearly and completely described below in conjunction with the embodiments.

[0019] Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0020] It should be noted that the terms "first", "second", etc. in the description and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances for the embodiments of this application described herein.

[0021] As Figures 1 - 3 shown, it is a preferred embodiment of the present utility model, a high-voltage earthing switch, including a support base 1, on which an insulator 11 and a rotating shaft 2 are provided. A static contact 12 is provided at the top of the insulator 11. An earthing knife 4 elastically connected to the support base 1 is fixedly provided on the rotating shaft 2. Contact portions 43 protruding outward are provided on both sides of the static contact 12. The contact knife includes a first knife plate 41 and a second knife plate 42 spaced apart from each other. After the earthing knife 4 is driven to rotate by the rotating shaft 2, the inner sides of the first knife plate 41 and the second knife plate 42 are respectively in contact with the contact portions 43 on both sides of the static contact 12 to realize the earthing of the static contact 12.

[0022] A contact groove 44 penetrating the static contact 12 horizontally is further provided above the contact portion 43. A plurality of mating teeth 46 are provided at the top of each contact knife. A mating groove 47 is formed between each pair of mating teeth 46. After the first knife plate 41 and the second knife plate 42 are both installed, the mating teeth 46 at their tops mesh with each other in the mating grooves 47 of the other. The combined mating teeth 46 form a contact plate 45. After the earthing knife 4 is driven by the rotating shaft 2 to rotate upward, the contact plate 45 fits and inserts into the contact groove 44. In this embodiment, both the contact groove 44 and the combined contact plate 45 are arc-shaped, which is to adapt to the rotation process of the earthing knife 4, increase the contact area between the earthing knife 4 and the contact head, thereby reducing the contact resistance between the two, and reducing the occurrence of poor contact between the contact head and the earthing knife 4.

[0023] It further includes a toggle arm 3 fixedly connected to the rotating shaft 2. The end of the toggle arm 3 is fixedly connected to the earthing knife 4. Push plates 33 are fixedly provided on both sides of the toggle arm 3. A groove-like structure is provided on the push plates 33. A spring seat 31 is further rotatably connected to the toggle arm 3 through a connecting shaft 34. A spring 32 elastically connected to the support base 1 is provided on the spring seat 31.

[0024] Both ends of the connecting shaft 34 are engaged in the groove-like structure of the push plate 33. After the connecting shaft 34 rotates downward, the push plate 33 is used to push the connecting shaft 34, driving the spring seat 31 to elastically contract. The grounding knife 4 will be pressed by the elastic force, making it rotate upward more quickly.

[0025] On this basis, vertical guide grooves 5 are provided on the first knife plate 41 and the second knife plate 42. An installation hole 51 is provided in the middle of the guide groove 5. A pin sleeve 52 that partially fits the first knife plate 41 and the second knife plate 42 is penetrated in the installation hole 51. Further, a retaining ring 53 is fixedly provided at each end of the pin sleeve 52. A plurality of disc springs 54 sleeved on the pin sleeve 52 are provided inside the retaining ring 53. The innermost disc spring 54 also presses inward against the first knife plate 41 or the second knife plate 42 to prevent the two knife plates from loosening.

[0026] As described above, this is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present application can easily think of changes or substitutions, which should all be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A high-voltage earthing switch, comprising a support base (1), an insulator (11) and a rotating shaft (2) are provided on the support base (1), a static contact (12) is provided at the top of the insulator (11), and an earthing knife (4) elastically connected to the support base (1) is fixedly provided on the rotating shaft (2), characterized in that: A contact part (43) protruding outward is provided on the side of the static contact (12). The earthing knife (4) is in contact with the contact part (43). A contact groove (44) horizontally penetrating the static contact (12) is provided above the contact part (43). A contact plate (45) that fits and inserts into the contact groove (44) is further provided at the top of the earthing knife (4).

2. The high-voltage earthing switch according to claim 1, wherein: Contact parts (43) protruding outward are provided on both sides of the static contact (12). The earthing knife (4) includes a first knife plate (41) and a second knife plate (42). The first knife plate (41) and the second knife plate (42) are respectively in contact with a contact part (43). A plurality of mating teeth (46) are provided at the top of each of the first knife plate (41) and the second knife plate (42). The mating teeth (46) on the two knife plates mesh to form the contact plate (45).

3. The high-voltage earthing switch according to claim 2, characterized in that: It further includes an elbow arm (3) fixedly connected to the rotating shaft (2). The earthing knife (4) is fixedly connected to the elbow arm (3). The elbow arm (3) is elastically connected to the support base (1) through a spring (32).

4. The high-voltage earthing switch according to claim 3, wherein: A push plate (33) is further fixedly connected to the elbow arm (3). One end of the spring (32) is connected to the support base (1), and the other end is connected to a spring seat (31). A connecting shaft (34) rotatably connected to the elbow arm (3) is provided on the spring seat (31). The end of the connecting shaft (34) is also in transmission connection with the push plate (33).

5. The high-voltage earthing switch according to claim 4, characterized in that: Guide grooves (5) extending vertically are provided on the first knife plate (41) and the second knife plate (42). An installation hole (51) is provided in the middle of the guide groove (5). A pin sleeve (52) partially fitting the first knife plate (41) and the second knife plate (42) penetrates through the installation hole (51).

6. The high-voltage earthing switch according to claim 5, wherein: A retaining ring (53) is fixedly provided at each end of the pin sleeve (52). A plurality of disc springs (54) sleeved on the pin sleeve (52) are provided inside the retaining ring (53). The innermost disc spring (54) also presses inward against the first knife plate (41) or the second knife plate (42).

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