Grounding arc absorption structure of grounding switch

Abstract

The utility model discloses a grounding arc-absorbing structure of a grounding switch, comprising a grounding static contact and an arc-absorbing assembly which are installed on a rack, the arc-absorbing assembly comprises two arc-absorbing supports which are oppositely arranged at two sides of the grounding static contact respectively, and two arc-absorbing members which are arranged at the tops of the two arc-absorbing supports, according to the technical scheme, when the movable contact knife moves towards the grounding static contact, the elastic arc guide parts are in discharge contact with the movable contact knife firstly, so that electric arcs are generated between the arc absorption pieces and the movable contact in advance, and the arc absorption pieces are in contact with the grounding static contact. According to the grounding switch, electric arc can be absorbed through the arc absorption piece, so that the grounding static contact is prevented from being burnt out by the electric arc, the elastic arc guide part can elastically shift and avoid when being extruded by the movable contact knife, normal contact between the movable contact knife and the grounding static contact is not interfered, safe grounding operation of the grounding switch is ensured, and the grounding switch is safe and reliable to use.

Description

Technical Field

[0001] The utility model relates to the technical field of power transmission and distribution switch equipment, and in particular to a grounding arc absorption structure of a grounding switch. Background Art

[0002] Inflatable ring main unit is widely used in medium and high voltage power transmission and distribution networks for the distribution of electric energy and the protection of lines. The ring main unit has a load switch (isolating switch) and a grounding switch. The grounding switch in the existing ring main unit often adopts a grounding knife switch type. The grounding switch operating mechanism is used to drive the grounding knife switch to quickly complete the closing operation. When the load switch of the ring main unit fails to remove the fault, the grounding switch must be closed to protect the safety of its own equipment and the lower-level equipment. That is, the grounding switch is closed when it is energized. Affected by the lower-level load, there will be a large closing current, which will cause a high-temperature arc when the moving contact knife is close to the grounding static contact, and it is easy to break through the contact part of the contact that is too close, causing serious grounding contact erosion and leading to the failure of the grounding switch to close. The line cannot be safely grounded, which makes the on-site operation unsafe. Utility Model Content

[0003] Therefore, the technical problem to be solved by the utility model is to overcome the problem in the prior art that when the moving contact knife approaches the grounding static contact, a high-temperature arc will burn and break through the grounding static contact, causing the grounding switch to fail to close and the line cannot be safely grounded.

[0004] In order to solve the above problems, the utility model provides a grounding arc absorption structure of a grounding switch, including a frame and a grounding static contact and an arc absorption assembly installed on the frame, the arc absorption assembly including two arc absorption brackets which are relatively arranged on both sides of the grounding static contact, and two arc absorption parts which are arranged on the top of the two arc absorption brackets and higher than the grounding static contact, the two arc absorption parts have two elastic arc guiding parts which are bent and extended toward the bottom of the arc absorption bracket and are located between the two arc absorption brackets and the grounding static contact, and the two elastic arc guiding parts are respectively opposite to the side surfaces of the grounding static contact.

[0005] As a preferred solution, a guide socket with a large diameter at both ends and a small diameter in the middle is formed between the two elastic arc guide portions, and the grounding static contact is located in the guide socket.

[0006] As a preferred solution, the arc-absorbing member includes a connecting piece that is fitted and connected to the top of the arc-absorbing bracket, and a bending piece that is formed by bending the connecting piece downward, and the bending piece is an elastic arc-guiding portion.

[0007] As a preferred solution, two accommodating grooves are formed between the two arc-absorbing brackets and the grounding static contact, and the two elastic arc-guiding parts are symmetrically extended and accommodated in the two accommodating grooves, so that the elastic arc-guiding parts can be elastically displaced in the accommodating grooves when pressurized.

[0008] As a preferred embodiment, the frame includes a mounting beam on which the grounding static contact and the arc absorbing assembly are mounted, the mounting beam includes a horizontal plate surface and a vertical plate surface connected in an L-shaped structure, the grounding static contact is fixed on the vertical plate surface, and two arc absorbing brackets are respectively fixed on the horizontal plate surface.

[0009] As a preferred solution, the arc-absorbing bracket includes an upper support plate arranged on the top thereof and connected to the arc-absorbing component, and a lower support plate connected to the transverse plate surface, a buffer pad located below the grounding static contact is installed on the transverse plate surface, the lower support plate of the arc-absorbing bracket is fastened and pressed between the buffer pad and the transverse plate surface, and the buffer pad, the arc-absorbing bracket and the transverse plate surface are kept fixedly connected by a screw structure.

[0010] As a preferred solution, the lower supporting plates of the two arc-absorbing supports are connected in an integral structure, so that the two arc-absorbing supports are connected to form a U-shaped space that semi-encloses the grounding static contact.

[0011] As a preferred solution, the arc-absorbing member is detachably connected to the top of the arc-absorbing support via a connecting structure.

[0012] As a preferred solution, the connection structure is a screw structure, a rivet structure or a pin structure for fixedly connecting the arc-absorbing member and the arc-absorbing bracket.

[0013] As a preferred solution, the connecting structure includes a rivet screw riveted on the connecting plate of the arc-absorbing component, and a connecting hole arranged on the upper support plate of the arc-absorbing bracket. The rivet screw passes through the connecting hole and is locked by a nut, and the nut cooperates and abuts against the bottom surface of the upper support plate.

[0014] Compared with the prior art, the technical solution of the utility model has the following advantages:

[0015] 1. In the grounding arc absorption structure of the grounding switch provided by the utility model, the arc absorption assembly is composed of two arc absorption brackets and two arc absorption members respectively arranged on the top of the two arc absorption members, and the two arc absorption members are provided with two elastic arc guides that are bent downward and extended between the two arc absorption brackets and the grounding static contact. The advantage of adopting this technical solution is that when the grounding switch is energized and closed, when the moving contact moves toward the grounding static contact, the elastic arc guide of the arc absorption member will first contact the moving contact for discharge, thereby generating an arc in advance between the arc absorption member and the moving contact, and the arc can be absorbed by the arc absorption member, with high arc absorption efficiency, thereby avoiding the grounding static contact from being burned by the arc, and improving the electrical service life of the product. At the same time, the elastic arc guide part of the bending structure design can better cater to the grounding separation and combination movement of the moving contact, and can be elastically deflected and avoided when squeezed by the moving contact, without affecting the normal contact between the moving contact and the grounding static contact, and reduces the burning damage of the arc to the contact by attracting the arc, thereby ensuring the safe grounding of the grounding switch, and safe and reliable use.

[0016] 2. In the grounding arc absorption structure of the grounding switch provided by the utility model, a guide socket is formed between two elastic arc guide parts. The diameter of the guide socket is designed to be large at both ends and small in the middle, thereby increasing the opening range. This design allows the moving contact knife to be smoothly inserted into the guide socket to form a clamping contact with the grounding static contact, thereby guiding the movement of the moving contact knife. The two elastic clamping parts are designed as bending pieces, which produce elastic deformation when squeezed by the moving contact knife, ensuring that the moving contact knife will not be obstructed when entering and exiting the guide socket. At the same time, the contact area and contact pressure between the moving contact knife and the moving contact knife can be increased, thereby improving the efficiency of attracting arcs. The two elastic arc guide parts can absorb arcs for the moving contact knife when it is grounded, thereby effectively preventing the grounding static contact from being burned by the arc, thereby protecting the contact.

[0017] 3. In the grounding arc-absorbing structure of the grounding switch provided by the utility model, the two arc-absorbing brackets are connected into an integrated structure through the lower supporting plate. During installation, the lower supporting plates of the two arc-absorbing brackets are fastened and pressed between the buffer pad and the horizontal plate surface. Specifically, the buffer pad, the lower supporting plate and the horizontal plate surface are fixedly connected together through a screw structure, thereby increasing the installation contact surface, ensuring reliable fitting and fixing, improving the installation strength, and ensuring the stability and reliability of the arc-absorbing bracket installation.

[0018] 4. In the grounding arc-absorbing structure of the grounding switch provided by the utility model, a rivet screw is provided on the connecting plate of the arc-absorbing component, and a connecting hole for the rivet screw to pass through is provided on the upper supporting plate of the arc-absorbing bracket. During installation, the connecting plate of the arc-absorbing component is attached to the upper supporting plate of the arc-absorbing bracket, and the rivet screw is passed through the connecting hole and then locked with a nut, thereby realizing the installation and fixation between the arc-absorbing component and the arc-absorbing bracket. The installation structure is simple, which also facilitates the disassembly and replacement of the arc-absorbing component, thereby improving the installation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the drawings required for use in the specific implementation or the description of the prior art will be briefly introduced below.

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the grounding arc absorption structure of the grounding switch of the utility model;

[0021] Figure 2 It is a cross-sectional structural diagram of the grounding arc absorption structure of the grounding switch of the utility model;

[0022] Figure 3 This is a schematic diagram of the installation structure of the arc absorption component of the utility model;

[0023] Figure 4 It is a schematic diagram of the planar structure of the arc absorption component of the utility model.

[0024] Explanation of the reference numerals: 1. Frame; 10. Mounting beam; 11. Vertical plate surface; 12. Horizontal plate surface; 2. Grounding static contact; 3. Moving contact knife; 4. Arc absorbing bracket; 41. Upper support plate; 42. Lower support plate; 5. Arc absorbing member; 51. Elastic arc guide portion; 52. Connecting plate; 6. Guide socket; 7. Accommodating groove; 8. Buffer pad; 9. Riveting screw; 91. Nut. DETAILED DESCRIPTION

[0025] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0027] Example

[0028] The present embodiment is specifically described below in conjunction with the accompanying drawings:

[0029] The utility model provides Figure 1-4 The grounding arc absorption structure of a grounding switch shown in the figure includes a frame 1 and a grounding static contact 2, an arc absorption assembly and a moving contact knife 3 installed on the frame 1, the moving contact knife 3 is rotatably arranged on the frame 1 through a rotating shaft, the grounding static contact 2 is located on the movement trajectory of the moving contact knife, the arc absorption assembly includes two arc absorption brackets 4 which are relatively arranged on both sides of the grounding static contact 2, and two arc absorption parts 5 which are arranged on the top of the two arc absorption brackets 4 and are higher than the grounding static contact. The two arc absorption brackets are fixed on the frame, and the two arc absorption parts 5 have two elastic arc guiding parts 51 that are bent and extended toward the bottom direction of the arc absorption bracket 4 and are located between the two arc absorption brackets 4 and the grounding static contact 2, and the two elastic arc guiding parts 51 are respectively opposite to the side surfaces of the grounding static contact 2.

[0030] The above-mentioned embodiment is the core technical solution of the present embodiment. The arc absorbing assembly is composed of two arc absorbing brackets 4 and two arc absorbing members 5 respectively arranged on the top of the two arc absorbing members. The two arc absorbing members 5 are provided with two elastic arc guides 51 which are bent downward and extended between the two arc absorbing brackets 4 and the grounding static contact 2. The advantage of adopting this technical solution is that when the grounding switch is energized and closed, when the moving contact blade 3 moves toward the grounding static contact 2, the elastic arc guide 51 of the arc absorbing member 5 will firstly contact the moving contact blade for discharge, thereby An arc is generated in advance between the moving contact and the moving contact blade, and the arc can be absorbed by the arc absorbing member 5 with high arc absorption efficiency, thereby preventing the grounding static contact 2 from being burned by the arc and improving the electrical service life of the product. At the same time, the elastic arc guiding portion 51 with such a bent structure design can better cater to the grounding separation and combination movement of the moving contact blade, and can elastically deviate and avoid when squeezed by the moving contact blade, without affecting the normal contact between the moving contact blade and the grounding static contact 2, and by attracting the arc to reduce the burning damage to the contact by the arc, thereby ensuring the safe grounding of the grounding switch, and safe and reliable use.

[0031] Combine the following Figure 2-4 The specific setting methods of arc-absorbing parts and arc-absorbing brackets are explained in detail:

[0032] A guide socket 6 is formed between the two elastic arc guide parts 51. The caliber of the guide socket 6 is large at both ends and small in the middle. The grounding static contact 2 is located in the guide socket 6. This design increases the opening range, which helps the moving contact knife to be smoothly inserted into the guide socket 6 to form a clamping contact with the grounding static contact 2, thereby guiding the movement of the moving contact knife. The two elastic clamping parts are set in a curved shape, and elastic deformation is generated when the moving contact knife is squeezed, ensuring that the moving contact knife will not be obstructed when entering and exiting the guide socket 6. At the same time, the contact area and contact pressure with the moving contact knife can be increased, and the arc absorption efficiency is improved. The two elastic arc guide parts 51 have an arc absorption effect on the moving contact knife when it is grounded, thereby effectively preventing the grounding static contact from being burned by the arc, thereby protecting the contact.

[0033] It is further preferred that two accommodating grooves 7 are formed between the two arc-absorbing brackets 4 and the grounding static contact 2, and two elastic arc-guiding portions 51 are symmetrically extended and accommodated in the two accommodating grooves 7. Since the movable contact blade will slightly deviate during the rotation process, the elastic arc-guiding portion 51 can be elastically deviated in the accommodating groove 7 when being squeezed by the movable contact blade, and can be force buffered, so that the normal grounding opening and closing movement of the movable contact blade will not be hindered, and the position space required for elastic deviation is provided for the elastic arc-guiding portion 51 through the accommodating groove. Among them, Figure 3-4 As shown, the arc absorbing member 5 includes a connecting piece 52 which is fitted and connected to the top of the arc absorbing bracket 4, and a bent piece which is bent downward by the connecting piece 52. The bent piece is an elastic arc-guiding portion 51 which can be elastically deformed under pressure. With this structural arrangement, during the process of the moving contact blade 3 and the grounding static contact 2 being in contact with each other, the outer side surface of the moving contact blade can be in contact with the bent piece, or a certain gap can be formed between the two. Since the grounding switch is energized for closing operation, an arc is generated in advance between the moving contact blade and the bent piece of the arc absorbing member. The contact area with the moving contact blade can be increased by the bent piece. At the same time, since its lower end portion is close to the grounding static contact, it also has the function of attracting the arc on the grounding static contact, thereby improving the arc absorbing effect. The arc is absorbed by the arc absorbing member, thereby greatly reducing the burning damage of the moving contact blade and the grounding static contact by the arc, thereby protecting the contact.

[0034] Combination Figure 1-3As shown, the frame 1 includes a mounting beam 10 on which the grounding static contact 2 and the arc absorbing component are installed, and the mounting beam 10 includes a horizontal plate surface 12 and a vertical plate surface 11 connected in an L-shaped structure, the grounding static contact 2 is fixed on the vertical plate surface 11, and two arc absorbing brackets 4 are respectively fixed on the horizontal plate surface 12, that is, the grounding static contact 2 and the arc absorbing bracket 4 are respectively installed on the horizontal plate surface 12 and the vertical plate surface 11, and it is further preferably arranged that the arc absorbing bracket 4 includes an upper supporting piece 41 arranged on the top thereof and connected to the arc absorbing member 5, and a lower supporting piece 42 connected to the horizontal plate surface 12, and a buffer pad 8 located below the grounding static contact 2 is installed on the horizontal plate surface 12, and the function of the buffer pad 8 is to The grounding and closing movement of the contact knife plays a force buffering role to prevent the moving contact knife from directly hitting the mounting beam 10. The lower support piece 42 of the arc-absorbing bracket 4 is fastened and pressed between the buffer pad 8 and the transverse plate surface 12. The buffer pad 8, the arc-absorbing bracket 4 and the transverse plate surface 12 are fixedly connected by a screw structure, and mounting holes for the screw structure to pass through are respectively provided on the buffer pad 8, the arc-absorbing bracket 4 and the transverse plate surface 12, thereby ensuring that the relative positions of the buffer pad, the arc-absorbing bracket and the transverse plate surface are fixed. This buffer pad 8 is in the shape of a rectangular parallelepiped and is pressed and covered on the lower support piece of the arc-absorbing bracket 4, thereby increasing the installation contact surface, ensuring reliable matching and fixing, improving the installation strength, and ensuring the stability and reliability of the arc-absorbing bracket installation.

[0035] As a preferred embodiment, the lower supporting plates of the two arc-absorbing brackets 4 are connected in an integral structure, so that the two arc-absorbing brackets 4 are connected to form a U-shaped space that semi-encloses the grounding static contact 2, and the U-shaped space includes two accommodating grooves 7 formed between the two arc-absorbing brackets 4 and the grounding static contact 2. The two arc-absorbing brackets designed in this way are designed as an integral structure, which is convenient for molding and manufacturing, and convenient for installation.

[0036] In this embodiment, the arc-absorbing member 5 is detachably connected to the top of the arc-absorbing bracket 4 through a connecting structure, which facilitates the replacement of the arc-absorbing member 5. As a preferred embodiment, the arc-absorbing member 5 is fixedly connected to the arc-absorbing bracket 4 by means of a screw structure. For details, refer to Figure 2 and Figure 4The connection structure includes a rivet screw 9 arranged on the connecting piece 52 of the arc-absorbing component 5, and a connecting hole arranged on the upper supporting piece 41 of the arc-absorbing bracket 4. The rivet screw 9 is locked by a nut 91 after passing through the connecting hole. The nut 91 cooperates and abuts against the bottom surface of the upper supporting piece 41. The rivet screw 9 is combined with the connecting piece 52 by riveting. Specifically, the tail end of the rivet screw 9 is fixedly connected to the connecting piece of the arc-absorbing component 5 by riveting. This structural setting realizes the installation and fixation between the arc-absorbing component 5 and the arc-absorbing bracket 4 by fastening and matching the nut and the rivet screw. The installation structure is simple and the matching and fixing are reliable. It is also convenient to disassemble and replace the arc-absorbing component, thereby improving the installation efficiency.

[0037] In the above embodiment, although the connection structure preferably adopts a screw structure to achieve a fixed connection between the arc-absorbing member and the arc-absorbing bracket, it is obvious that there may be other different settings. For example, the connection structure may also choose a rivet structure or a pin structure or a snap-on structure to fix the arc-absorbing member and the arc-absorbing bracket, which can also achieve a fixed connection between the arc-absorbing member and the arc-absorbing bracket. Those skilled in the art can make a choice of a specific setting method of the connection structure based on the above description, and other equivalent embodiments will not be described one by one here.

[0038] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of the invention of the utility model.

Claims

1. A grounding arc absorption structure of a grounding switch, comprising a frame (1), a grounding static contact (2) and an arc absorption assembly mounted on the frame (1), characterized in that: The arc absorbing assembly comprises two arc absorbing brackets (4) arranged on both sides of the grounding static contact (2) and two arc absorbing members (5) arranged on the top of the two arc absorbing brackets (4) and higher than the grounding static contact. The two arc absorbing members (5) have two elastic arc guiding portions (51) bent and extended toward the bottom of the arc absorbing brackets and located between the two arc absorbing brackets (4) and the grounding static contact (2). The two elastic arc guiding portions (51) are respectively opposite to the side surfaces of the grounding static contact (2).

2. The grounding arc absorption structure of the grounding switch according to claim 1, characterized in that: A guide socket (6) having a larger diameter at both ends and a smaller diameter in the middle is formed between the two elastic arc guide portions (51), and the grounding static contact (2) is located in the guide socket (6).

3. The grounding arc absorption structure of the grounding switch according to claim 1, characterized in that: The arc-absorbing member (5) comprises a connecting piece (52) fitted and connected to the top of the arc-absorbing bracket (4), and a bent piece formed by bending the connecting piece (52) downward, wherein the bent piece is an elastic arc-guiding portion (51).

4. The grounding arc absorption structure of the grounding switch according to any one of claims 1 to 3, characterized in that: Two accommodating grooves (7) are formed between the two arc-absorbing brackets (4) and the grounding static contact (2), and the two elastic arc-guiding portions (51) are symmetrically extended and accommodated in the two accommodating grooves (7), respectively, so that the elastic arc-guiding portions (51) can be elastically deflected in the accommodating grooves (7) when pressurized.

5. The grounding arc absorption structure of the grounding switch according to any one of claims 1 to 3, characterized in that: The frame (1) comprises a mounting beam (10) on which the grounding static contact (2) and the arc absorbing assembly are mounted, the mounting beam (10) comprising a horizontal plate surface (12) and a vertical plate surface (11) connected in an L-shaped structure, the grounding static contact (2) being fixed on the vertical plate surface (11), and two arc absorbing brackets (4) being respectively fixed on the horizontal plate surface (12).

6. The grounding arc absorption structure of the grounding switch according to claim 5, characterized in that: The arc-absorbing bracket (4) comprises an upper support plate (41) arranged at the top thereof and connected to the arc-absorbing member (5), and a lower support plate (42) connected to the transverse plate surface (12); a buffer pad (8) located below the grounding static contact (2) is installed on the transverse plate surface (12); the lower support plate (42) of the arc-absorbing bracket (4) is fastened and pressed between the buffer pad (8) and the transverse plate surface (12); the buffer pad (8), the arc-absorbing bracket (4) and the transverse plate surface (12) are fixedly connected by a screw structure.

7. The grounding arc absorption structure of the grounding switch according to claim 6, characterized in that: The lower support plates (42) of the two arc-absorbing supports (4) are connected in an integral structure, so that the two arc-absorbing supports (4) are connected to form a U-shaped space that semi-encloses the grounding static contact (2).

8. The grounding arc absorption structure of the grounding switch according to claim 1, characterized in that: The arc-absorbing member (5) is detachably connected to the top of the arc-absorbing bracket (4) via a connecting structure.

9. The grounding arc absorption structure of the grounding switch according to claim 8, characterized in that: The connection structure is a screw structure, a rivet structure or a pin structure that fixedly connects the arc-absorbing member (5) and the arc-absorbing bracket (4).

10. The grounding arc absorption structure of the grounding switch according to claim 8, characterized in that: The connection structure comprises a self-clinching screw (9) arranged on a connection plate (52) of the arc-absorbing member (5), and a connection hole arranged on an upper support plate of the arc-absorbing bracket (4); the self-clinching screw (9) is passed through the connection hole and then locked by a nut (91); the nut (91) cooperates and abuts against the bottom surface of the upper support plate (41).

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