CN219591690U - Grounding terminal and grounding switch - Google Patents

Abstract

The utility model relates to the technical field of grounding switches, in particular to a grounding terminal and a grounding switch, and aims to provide the grounding terminal and the grounding switch so as to solve the technical problems that the grounding terminal in the prior art is not suitable for a high-current circuit and a central conductive column or an insulating flange is easy to burn out. The earthing switch comprises a switch shell, wherein a contact structure and an earthing terminal electrically connected with the contact structure through a conductive bar are arranged in the switch shell, the earthing terminal is fixedly arranged on the switch shell and comprises a terminal shell, a column insulator is arranged in the terminal shell and comprises a central conductive column and an insulating flange injection-molded with the central conductive column, a conductive column penetrating hole for the central conductive column to penetrate is formed in the terminal shell, the central conductive column is a copper alloy column, and an insulating sealing structure is arranged between the central conductive column and the conductive column penetrating hole.

Description

A grounding terminal and grounding switch

technical field

The utility model relates to the technical field of grounding switches, in particular to a grounding terminal and a grounding switch.

Background technique

The grounding switch usually includes a switch housing that can be fixedly connected to the GIS busbar barrel. The switch housing is equipped with a conventional contact structure. The contact structure includes a movable movable contact and a movable contact that cooperates with the movable contact sleeve. The head seat, in order to protect the switch from grounding, the switch housing of the grounding switch is usually connected with a grounding terminal. The grounding terminal is used to extend out of the switch housing for grounding protection. The grounding terminal is connected to the moving On the contact seat, the conductive connection between the ground terminal and the contact structure in the switch is realized, so that the contact structure is grounded.

The grounding terminal in the prior art includes a terminal housing for bolt connection with the grounding switch housing, and a post insulator for grounding is arranged inside the terminal housing. The post insulator includes a central conductive post and connects the central conductive post and the terminal housing An insulating flange for fixed connection. The insulating flange is usually epoxy resin injection-molded with the central conductive column. One end of the central conductive column extends into the switch housing to connect to the guide bar, and the other end extends out of the terminal housing for grounding.

When pouring the insulating flange on the central conductive column, it is known that the temperature expansion coefficient of epoxy resin is α=26*10-6K-1, so it is necessary to select a material similar to the temperature expansion coefficient of epoxy resin to make the central conductive Otherwise, it is very easy to cause cracks on the forming surface of the central conductive column and the insulating flange, which will cause air leakage when the grounding terminal is connected and used. The temperature expansion coefficient of aluminum is α=23.9*10-6K-1, which is the closest conductive metal to the temperature expansion coefficient of epoxy resin. Therefore, in the prior art, aluminum alloy is usually used to make the central conductive column in the grounding terminal. Specifically, Using rod 7A04-T6A grade aluminum alloy structure, the conductive column can be applied to the quick grounding switch of GIS product equipment above 363kV, its rated short-time withstand current is 63kA, and its rated peak withstand current is 171kA.

However, in the prior art, the grounding terminal using the central conductive column made of aluminum alloy cannot meet the capacity of 80kA short-circuit current under special working conditions. If the grounding terminal in the prior art is used to apply the grounding switch to a current circuit greater than 63kA, It is prone to the problem that the central conductive post and the insulating flange cannot withstand the high-voltage current and burn out, causing damage to the connection of the central conductive post, which directly affects the connection safety of the grounding terminal.

Utility model content

The purpose of this utility model is to provide a grounding terminal to solve the technical problem that the grounding terminal in the prior art is not suitable for high-current circuits, and the central conductive column or insulating flange is prone to burnout; in addition, the purpose of the utility model Another object is to provide a grounding switch to solve the above problems.

In order to achieve the above purpose, the technical solution of a grounding terminal provided by the utility model is:

A grounding terminal, including a terminal housing, in which a post insulator is installed, the post insulator includes a central conductive post and an insulating flange injection-molded with the central conductive post, and the terminal housing is provided with a central conductive post. The conductive post passing through the post is perforated, the central conductive post is a copper alloy post, and an insulating sealing structure is provided between the central conductive post and the conductive post hole.

Beneficial effects: the utility model is based on the structure of the grounding terminal in the prior art, and improves the grounding terminal. The central conductive column of the grounding terminal is made of copper alloy, which improves the withstand current density of the central conductive column, and makes the grounding terminal It is suitable for overloading short-term high-current circuits to prevent the central conductive column or insulating flange from burning out. At the same time, in order to prevent the expansion coefficient difference between the central conductive post and the insulating flange from being too large after changing the material, resulting in cracking of the mating connection surface between the central conductive post and its insulating flange, an insulating seal is also provided between the central conductive post and the terminal housing. Structure, the insulating sealing structure can insulate and seal the gap between the part of the central conductive post extending into the terminal housing and the terminal housing, so that even if the connection mating surface of the central conductive post and the insulating flange is cracked, due to the insulation of the insulating sealing structure Sealing and barrier, the grounding terminal will not leak air, which effectively solves the technical problems in the prior art that the grounding terminal is not suitable for high-current circuits, and the central conductive column or insulating flange is prone to burnout.

Preferably, the insulating and sealing structure includes an insulating sleeve that wraps around the central conductive post, and a sealing structure that seals the gap between the central conductive post and the through hole of the conductive post. The insulating sleeve ringed on the central conductive column can insulate and separate the central conductive column and the terminal housing. The sleeve structure is insulated and isolated along the axial direction of the central conductive column, which increases the contact area with the central conductive column, and the insulation effect is better. Well, then it is sealed by a sealing structure to prevent air leakage from the ground terminal.

Preferably, the sealing structure is a sealing gasket arranged between the insulating sleeve and the central conductive post and/or between the insulating sleeve and the through hole of the conductive post. The gap between the central conductive column and the perforation of the conductive column can be sealed by the sealing gasket, and the installation position of the sealing gasket is flexible and adjustable, and there are various assembly methods to ensure the sealing effect.

Preferably, sealing grooves for installing sealing gaskets are provided on the inner surface and the outer surface of the insulating sleeve. Through the sealing grooves provided on the inner and outer sides of the insulating sleeve, the sealing gaskets can be evenly pressed on the inner and outer sides of the insulating sleeve, which facilitates the fixing of the sealing gaskets, and at the same time, the sealing performance of the insulating sleeve is enhanced by the inner and outer two-layer sealing structure.

Preferably, the insulating sleeve is an S-shaped sleeve structure, and axially staggered sealing grooves are formed on the inner and outer sides of the S-shaped sleeve structure. The S-shaped sleeve can form axially staggered sealing grooves on its inner and outer sides, so that the installation of the two sealing gaskets and the subsequent sealing assembly will not affect each other. The insulating sleeve is sealed and connected to improve the sealing effect and prevent the sealing gasket from being dislocated or falling off.

Preferably, the extension length of the insulating sleeve is adapted to the length of the central conductive post protruding from the insulating flange. The insulating sleeve adapted to the length of the protruding part of the central conductive post can completely cover the outer peripheral surface of the protruding part of the central conductive post, ensuring the insulating effect of the insulating cover on the outer periphery of the central conductive post.

Preferably, the insulating sleeve is also provided with a detachment-preventing fixing structure for fixedly fitting with the terminal housing. The anti-detachment fixing structure prevents the insulating sleeve from deflecting outside the central conductive column or falling out of the conductive column perforation, thereby improving the assembly stability of the insulating sleeve.

Preferably, the anti-loosening fixing structure is an outer flange provided on the side of the insulating sleeve facing the insulating flange, and the through hole of the conductive post is provided with a stepped groove for pressing the outer flange. The stepped groove on the perforated hole of the conductive column can be adapted to compress the flanging, and the flanging integrally bent outward can be easily processed at the lower end of the insulating sleeve, saving processing difficulty and cost.

Preferably, the insulating sleeve is a stepped sleeve structure with different axial wall thicknesses, the wall thickness of the side of the insulating sleeve close to the insulating flange is smaller than the wall thickness of the side of the insulating sleeve away from the insulating flange, and the sealing structure It is set on the thick wall section of the insulating sleeve. By setting the insulating sleeve into a stepped shape, the central conductive column can be thickened at the step to ensure that the cross-sectional area of the central conductive column meets the conduction requirements and enhance the conductivity of the central conductive column. The stepped insulating sleeve can also be easily connected to the center The conductive column is connected, which is beneficial to the installation and fixation of the central conductive column and the insulating sleeve.

The technical scheme of a kind of earthing switch provided by the utility model is:

A grounding switch, comprising a switch housing, in which a contact structure and a grounding terminal electrically connected to the contact structure through a conductive row are arranged, the grounding terminal is fixed on the switch housing, and the grounding terminal includes a terminal housing, A post-type insulator is installed in the terminal housing. The post-type insulator includes a central conductive post and an insulating flange injection-molded with the central conductive post. The terminal housing is provided with a conductive post through hole for the central conductive post to pass through. The central conductive column is a copper alloy column, and an insulating sealing structure is provided between the central conductive column and the through hole of the conductive column.

Beneficial effects: the utility model improves the grounding terminal in the grounding switch based on the structure of the grounding terminal in the prior art, and the central conductive column of the grounding terminal is made of copper alloy, which improves the withstand current density of the central conductive column , so that the grounding terminal is suitable for overloaded short-term high-current circuits to prevent the central conductive column or insulating flange from burning out. At the same time, in order to prevent the expansion coefficient difference between the central conductive post and the insulating flange from being too large after changing the material, resulting in cracking of the mating connection surface between the central conductive post and its insulating flange, an insulating seal is also provided between the central conductive post and the terminal housing. Structure, the insulating sealing structure can insulate and seal the gap between the part of the central conductive post extending into the terminal housing and the terminal housing, so that even if the connection mating surface of the central conductive post and the insulating flange is cracked, due to the insulation of the insulating sealing structure Sealing and barrier, the grounding terminal will not leak air, which effectively solves the technical problems in the prior art that the grounding terminal is not suitable for high-current circuits, and the central conductive column or insulating flange is prone to burnout.

Preferably, the insulating and sealing structure includes an insulating sleeve that wraps around the central conductive post, and a sealing structure that seals the gap between the central conductive post and the through hole of the conductive post. The insulating sleeve ringed on the central conductive column can insulate and separate the central conductive column and the terminal housing. The sleeve structure is insulated and isolated along the axial direction of the central conductive column, which increases the contact area with the central conductive column, and the insulation effect is better. Well, then it is sealed by a sealing structure to prevent air leakage from the ground terminal.

Preferably, the sealing structure is a sealing gasket arranged between the insulating sleeve and the central conductive post and/or between the insulating sleeve and the through hole of the conductive post. The gap between the central conductive column and the perforation of the conductive column can be sealed by the sealing gasket, and the installation position of the sealing gasket is flexible and adjustable, and there are various assembly methods to ensure the sealing effect.

Preferably, sealing grooves for installing sealing gaskets are provided on the inner surface and the outer surface of the insulating sleeve. Through the sealing grooves provided on the inner and outer sides of the insulating sleeve, the sealing gaskets can be evenly pressed on the inner and outer sides of the insulating sleeve, which facilitates the fixing of the sealing gaskets, and at the same time, the sealing performance of the insulating sleeve is enhanced by the inner and outer two-layer sealing structure.

Preferably, the insulating sleeve is an S-shaped sleeve structure, and axially staggered sealing grooves are formed on the inner and outer sides of the S-shaped sleeve structure. The S-shaped sleeve can form axially staggered sealing grooves on its inner and outer sides, so that the installation of the two sealing gaskets and the subsequent sealing assembly will not affect each other. The insulating sleeve is sealed and connected to improve the sealing effect and prevent the sealing gasket from being dislocated or falling off.

Preferably, the extension length of the insulating sleeve is adapted to the length of the central conductive post protruding from the insulating flange. The insulating sleeve adapted to the length of the protruding part of the central conductive post can completely cover the outer peripheral surface of the protruding part of the central conductive post, ensuring the insulating effect of the insulating cover on the outer periphery of the central conductive post.

Preferably, the insulating sleeve is also provided with a detachment-preventing fixing structure for fixedly fitting with the terminal housing. The anti-detachment fixing structure prevents the insulating sleeve from deflecting outside the central conductive column or falling out of the conductive column perforation, thereby improving the assembly stability of the insulating sleeve.

Preferably, the anti-loosening fixing structure is an outer flange provided on the side of the insulating sleeve facing the insulating flange, and the through hole of the conductive post is provided with a stepped groove for pressing the outer flange. The stepped groove on the perforated hole of the conductive column can be adapted to compress the flanging, and the flanging integrally bent outward can be easily processed at the lower end of the insulating sleeve, saving processing difficulty and cost.

Preferably, the insulating sleeve is a stepped sleeve structure with different axial wall thicknesses, the wall thickness of the side of the insulating sleeve close to the insulating flange is smaller than the wall thickness of the side of the insulating sleeve away from the insulating flange, and the sealing structure It is set on the thick wall section of the insulating sleeve. By setting the insulating sleeve into a stepped shape, the central conductive column can be thickened at the step to ensure that the cross-sectional area of the central conductive column meets the conduction requirements and enhance the conductivity of the central conductive column. The stepped insulating sleeve can also be easily connected to the center The conductive column is connected, which is beneficial to the installation and fixation of the central conductive column and the insulating sleeve.

Description of drawings

Fig. 1 is the structural representation of grounding switch in the embodiment 1 provided by the utility model;

FIG. 2 is a schematic structural diagram of the ground terminal in Embodiment 1 provided by the present invention.

Explanation of reference signs:

1. Switch housing; 2. Moving contact; 3. Moving contact seat; 4. Spring contact finger; Center conductive column; 10. Terminal fixing bolt; 11. Insulation flange fixing bolt; 12. Guide bar fixing hole; 13. Installation groove; 14. Sealing ring; 15. Insulating sleeve; 16. Sealing gasket; 17. Anti-drop Fixed structure; 18. Pressure groove.

Detailed ways

Below in conjunction with embodiment the utility model is described in further detail.

Specific embodiment 1 of the grounding switch provided by the utility model:

The grounding switch in this embodiment is installed on the busbar barrel of the GIS when in use, and the contact structure in the switch housing 1 plays the role of the opening and closing circuit. As shown in Figures 1 and 2, the grounding switch includes a cylindrical The switch housing 1, the switch housing 1 can be docked with the busbar barrel of the GIS through the flange surface at the right end of the housing, and the switch housing 1 is filled with a mixed inert gas such as SF ₆ /N ₂ when in use.

Among them, the right port of the switch housing 1 is fixed with a movable contact seat 3, and the movable contact seat 3 is provided with a conductive inner hole extending left and right, and the conductive inner hole is guided and slidably equipped with a movable contact 2 extending left and right. The moving contact 2 is a conductive long rod structure, and the outer periphery of the right end is provided with a spring contact finger 4 that is in conductive contact with the conductive inner hole of the moving contact seat 3. The moving contact 2 can extend rightward into the busbar barrel and is arranged on the right side of the switch. The static contact on the side conducts conductive cooperation, and the right end of the moving contact 2 constitutes a contact end for breaking and cooperating with the static contact.

As shown in Figure 1, the moving contact seat 3 in this embodiment is bolted with a guide bar 5 extending left and right, and the guide bar 5 also extends left and right in the inner cavity of the switch housing 1, and the switch housing 1 There is a grounding port on the top, and a grounding terminal 6 is installed in the grounding port, and the guide bar 5 extends to the bottom of the grounding terminal 6, and the grounding switch is realized by fixedly connecting the guide bar 5 and the central conductive column 9 in the grounding terminal 6 The conductive connection between the middle contact structure and the grounding terminal 6 enables the grounding switch to achieve grounding connection through the grounding terminal 6, and the central conductive column 9 in the grounding terminal 6 can extend out of the switch housing 1 to connect with the grounding wire or directly ground connect.

As shown in Figures 1 and 2, the grounding terminal 6 in this embodiment is fastened to the grounding port on the top of the switch housing 1 by bolts, the grounding terminal 6 includes a terminal housing 7 docked on the switch housing 1 and a device In the terminal housing 7 and can extend down to the post insulator in the inner cavity of the switch, the post insulator includes a central conductive post 9, and the outer periphery of the central conductive post 9 is provided with insulation and isolation between the central conductive post 9 and the terminal housing 7 The insulating flange 8 is also used to fix the central conductive post 9 in the terminal housing 7 . The insulating flange 8 is specifically an epoxy resin injection-molded with the central conductive column 9 .

As shown in Figure 2, the horizontal ends of the upper side of the terminal housing 7 are pierced from top to bottom with terminal fixing bolts 10 for fixing the terminal housing 7 in the switch housing 1, and the center of the terminal housing 7 is provided with a The conductive column pierced by the central conductive column 9 is perforated, and the insulating flange 8 is arranged under the terminal housing 7. After the terminal housing 7 is connected with the switch housing 1, the insulating flange 8 is located in the inner cavity of the switch housing 1, and the insulation The horizontal ends of the flange 8 are provided with insulating flange fixing bolts 11, and the insulating flange fixing bolts 11 pass through the insulating flange 8 from bottom to top and are fixed on the lower side of the terminal housing 7 to connect the central conductive column The upper end of 9 extends into the conductive column perforation on the terminal housing 7 . Wherein, the lower end of the central conductive column 9 is also provided with a guide row fixing hole 12, and the guide row fixing hole 12 is a threaded hole, and the threaded hole is used for installing the guide row fixing bolt, and the guide row fixing bolt is used to connect the center conductive column 9 is fixedly connected with guide row 5.

As shown in Figure 2, installation grooves 13 and sealing rings 14 are provided between the terminal housing 7 and the switch housing 1, and between the insulating flange 8 and the terminal housing 7 to ensure the tightness of the connection, so as to ensure that the grounding terminal 6 is Connection tightness on switch housing 1.

In this embodiment, in order to make the grounding switch suitable for high-current circuits, the central conductive column 9 is made of copper alloy, specifically copper rod TY- The structure, because the short-term current flow capacity of copper material is about 1.5 times that of aluminum material, its rated short-time withstand current can be increased from 63kA to 80kA compared with aluminum alloy, which meets the needs of large current and high voltage circuits. However, after continuous experiments and analysis, the expansion coefficient of the central conductive post 9 of the conventional grounding terminal 6 is similar to that of the insulating flange 8, so the overall connection of the post insulator is relatively stable, and the temperature expansion coefficient of epoxy resin is α=26*10-6K -1, copper temperature expansion coefficient α=18.7*10-6K-1, aluminum temperature expansion coefficient α=23.9*10-6K-1, it can be seen that when the central conductive column 9 is made of copper alloy, the central conductive column 9 and the insulation method The expansion coefficient of the flange 8 is quite different. When the temperature of the installation environment of the grounding terminal 6 changes, the internal residual stress of the central conductive post 9 is relatively large, and the connection surface between the central conductive post 9 and the insulating flange 8 is prone to cracking, resulting in The quick grounding switch leaks air; in order to prevent this phenomenon from occurring, an insulating seal for insulating and sealing the end of the central conductive post 9 is provided between the central conductive post 9 and the conductive post perforation on the terminal housing 7 in this embodiment structure.

As shown in Figure 2, the insulating sealing structure includes an insulating sleeve 15 that is looped on the central conductive column 9 and a sealing structure that seals the gap between the central conductive column 9 and the perforation of the conductive column. The insulating sleeve 15 is an integrally formed casing. structure, the sealing structure is a sealing gasket 16 arranged between the insulating sleeve 15 and the central conductive column 9, and between the insulating sleeve 15 and the through hole of the conductive column. The insulating sleeve 15 in this embodiment is ring-wrapped on the outer peripheral surface of the extended section of the central conductive column 9 above the insulating flange 8, and the height of the insulating sleeve 15 is adapted to the part of the central conductive column 9 protruding from the insulating flange 8. , to cover the outer peripheral surface of the protruding part of the central conductive column 9 . Wherein, the insulating sleeve 15 is an S-shaped sleeve body structure, and the inner groove of the S-shaped bending part of the insulating sleeve 15 forms axially staggered sealing grooves located on the inner and outer sides of the insulating sleeve 15, as shown in Figure 2, on the insulating sleeve 15 Sealing gaskets 16 are provided in the axially staggered sealing grooves to ensure the connection tightness of the insulating sleeve 15 . The insulating sleeve 15 is made of insulating material, which seals the end of the central conductive post 9 and insulates the central conductive post 9 from the terminal housing 7 at the same time.

As shown in Figure 2, in order to ensure that the connection between the central conductive column 9 and the terminal housing 7 of the insulating sleeve 15 is stable, the bottom end of the insulating sleeve 15 is also provided with an anti-off fixing structure 17. The anti-off in this embodiment The fixing structure 17 is specifically an outer flange arranged on the side of the insulating sleeve 15 facing the insulating flange 8, and a stepped pressure groove 18 for pressing the outer flange is provided on the conductive column perforation, and the pressure groove 18 can be pressed against the outer flange. Partially, so that the connection of the insulating sleeve 15 outside the central conductive column 9 is stable. In this embodiment, the insulating sleeve 15 has a stepped sleeve structure with different axial wall thicknesses, and the wall thickness of the insulating sleeve 15 on the side close to the insulating flange 8 is smaller than the wall thickness of the insulating sleeve 15 on the side away from the insulating flange 8 , that is, the wall thickness of the S-shaped section is greater than the wall thickness of the outer flange part, the sealing gasket 16 is arranged on the thick-walled section, and the central conductive column 9 is set as a stepped column structure adapted to the insulating sleeve 15, thereby increasing the column size, Improve electrical conductivity.

In the grounding switch in this embodiment, the central conductive column 9 of the grounding terminal 6 is made of copper alloy, which improves the withstand current density of the central conductive column 9, so that the grounding switch is suitable for circuits with overloaded short-term large currents. At the same time, in order to prevent the mating connection surface of the central conductive post 9 and the insulating flange 8 from cracking after the material is replaced, an insulating sealing structure is also provided between the central conductive post 9 and the terminal housing 7, and the insulating sealing structure can extend the central conductive post 9. The perforated part of the conductive post is insulated and sealed with the terminal housing 7, so that even if the connection mating surface of the central conductive post 9 and the insulating flange 8 is cracked, the grounding switch will not leak due to the insulating and sealing barrier of the insulating and sealing structure , which effectively solves the technical problem that the ground terminal in the prior art is not suitable for high-current circuits, and the central conductive post or insulating flange is prone to burnout.

Specific embodiment 2 of the grounding switch provided by the utility model:

The difference from Embodiment 1 is that in this embodiment, the insulating sleeves are of a separate stacked sleeve structure, and sealing gaskets are provided on the connection bonding surfaces between the insulating sleeves. In other embodiments, the insulating sleeve may also be of a radially split structure, that is, the insulating sleeve is a split-petal fastening arrangement.

Specific embodiment 3 of the grounding switch provided by the utility model:

The difference from Embodiment 1 is that in this embodiment, the insulating sleeve is a sleeve structure with the same axial wall thickness, and one end of the insulating sleeve is directly bent integrally to arrange an outer flange or an outer flange is arranged in the middle of the insulating sleeve , the conductive column perforation is provided with a pressure groove corresponding to the outer flange.

Specific embodiment 4 of the grounding switch provided by the utility model:

The difference from Embodiment 1 is that in this embodiment, the axial height of the insulating sleeve is lower than the height of the protruding section of the central conductive column, but the height of the insulating sleeve is greater than the thickness of the terminal housing.

Embodiment 5 of the grounding switch provided by the utility model:

The difference from Embodiment 1 is that the insulating sleeve is a straight sleeve structure, and sealing grooves are arranged on the inner and outer peripheral surfaces of the straight sleeve structure, and sealing gaskets are press-fitted in the sealing grooves. In other embodiments, the insulating sleeve may also be a sleeve structure with a saw-toothed section. When the insulating sleeve adopts a straight cylinder, the sealing groove may not be provided, and the sealing gasket is directly arranged on the inner and outer sides of the insulating sleeve.

Embodiment 6 of the grounding switch provided by the utility model:

The difference from Embodiment 1 is that in this embodiment, the anti-loosening fixing structure can also be an anti-loosening protrusion that is separately connected to the outer periphery of the insulating sleeve, such as a block and a step. In other embodiments, the anti-loosening fixing structure is a hoop or a clasp separately provided on the insulating sealing structure.

Embodiment 7 of the grounding switch provided by the utility model:

The difference from Embodiment 1 is that in this embodiment, the central conductive column is made of red copper alloy. In other embodiments, other national standard types of copper alloys such as brass alloys and manganese-copper alloys can also be used.

Embodiment 8 of the grounding switch provided by the utility model:

The difference from Embodiment 1 is that in this embodiment, a sealing gasket is only provided between the insulating sleeve and the central conductive post. In other embodiments, a sealing gasket is only provided between the insulating sleeve and the through hole of the conductive column.

Specific embodiment 9 of the grounding switch provided by the utility model:

The difference from Embodiment 1 is that in this embodiment, the sealing structure may also be a sealing packing filled between the sleeve and the central conductive post and/or between the insulating sleeve and the through hole of the conductive post. In other embodiments, the sealing structure can also be lengthened to form a gasket or a sealing sleeve structure.

Specific embodiments of the ground terminal provided by the utility model:

The grounding terminal in this embodiment has the same structure as the grounding terminal connected to the switch case in the above-mentioned embodiments of the grounding switch, including a central conductive column made of copper alloy, and a The insulating and sealing structure, wherein, the specific structure and connection method of the grounding terminal will not be repeated here.

Finally, it should be noted that the above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Although the utility model has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, It is still possible to modify the technical solutions described in the foregoing embodiments without creative effort, or to perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (10)

1. A grounding terminal, comprising a terminal housing (7), a post insulator is installed in the terminal housing (7), and the post insulator includes a central conductive post (9) and an injection molding with the central conductive post (9). The insulating flange (8), the terminal housing (7) is provided with a conductive column piercing hole for the central conductive column (9), it is characterized in that the central conductive column (9) is a copper alloy column, and the An insulating and sealing structure is provided between the central conductive column (9) and the through hole of the conductive column. 2. The grounding terminal according to claim 1, characterized in that, the insulating sealing structure comprises an insulating sleeve (15) which is looped on the central conductive post (9) and the central conductive post (9) and the conductive post are perforated The gap seal between the sealing structure. 3. The ground terminal according to claim 2, characterized in that, the sealing structure is arranged between the insulating sleeve (15) and the central conductive post (9) and/or between the insulating sleeve (15) and the conductive post hole gasket (16). 4. The grounding terminal according to claim 3, characterized in that, both the inner surface and the outer surface of the insulating sleeve (15) are provided with sealing grooves for installing sealing gaskets (16). 5. The grounding terminal according to claim 4, characterized in that the insulating sleeve (15) is an S-shaped sleeve structure, and axially staggered sealing grooves are formed on the inner and outer surfaces of the S-shaped sleeve structure. 6. The grounding terminal according to any one of claims 2-5, characterized in that, the extension length of the insulating sleeve (15) is suitable for the length of the central conductive column (9) protruding from the insulating flange (8). match. 7. The grounding terminal according to any one of claims 2-5, characterized in that, the insulating sleeve (15) is also provided with an anti-off fixing structure for fixedly fitting with the terminal housing (7) (17). 8. The grounding terminal according to claim 7, characterized in that, the anti-loosening fixing structure (17) is an outer flange provided on the side of the insulating sleeve (15) facing the insulating flange (8), and the conductive A stepped groove for pressing the outer flange is arranged on the column through hole. 9. The grounding terminal according to claim 8, characterized in that, the insulating sleeve (15) is a stepped sleeve structure with different axial wall thicknesses, and the insulating sleeve (15) is close to one side of the insulating flange (8). The wall thickness of the side is smaller than the wall thickness of the side of the insulating sleeve (15) away from the insulating flange (8), and the sealing structure is arranged on the thick wall section of the insulating sleeve (15). 10. A grounding switch, comprising a switch housing (1), the switch housing (1) is provided with a contact structure and a grounding terminal connected to the contact structure through a conductive row, and the grounding terminal is fixed on the switch housing ( 1), characterized in that the ground terminal is the ground terminal described in any one of claims 1-9.