A support insulator and switchgear

Abstract

The application provides a support insulator and a switch device, and belongs to the field of switch devices. The support insulator comprises an insulator and an embedded part arranged at one end of the insulator, the insulator forms a full wrapping structure for the embedded part, the embedded part is a conductive part, at least two plug-in grooves for inserting and conducting the conductive end of a conductive row are arranged on the embedded part, and a through port for the conductive row to pass through is arranged on the insulator at a position corresponding to the slot of the plug-in groove. The switch device comprises the support insulator. The support insulator fully wraps the embedded part in the insulator and inserts the conductive end of the conductive row into the embedded part, realizes full wrapping insulation of the conductive end of the conductive row, improves the insulation effect, reduces the requirement for insulation distance, and is beneficial to realizing miniaturization of the switch device.

Description

Technical Field

[0001] This invention belongs to the field of switching devices, and in particular relates to a supporting insulator and a switching device. Background Technology

[0002] In high-voltage switchgear and other switchgear, overhead conductor bars with long lengths require supporting insulators for support. Traditionally, the ends of supporting insulators are pre-embedded with metal inserts, which have threaded holes for mounting bolts. During installation, the conductor bar can be fixed to the supporting insulator with bolts.

[0003] Chinese invention patent application CN110729634A discloses a busbar support insulator and switchgear. The busbar support insulator has two parallel insulating wings integrally formed at its end. A mounting groove for installing the busbar (i.e., conductive busbar) overlap structure is formed between the insulating wings and the end face of the insulator. A threaded sleeve is embedded in the bottom of the mounting groove. After the overlap ends (i.e., conductive ends) of the two busbar sections overlap, bolts are passed through the overlap ends and connected to the threaded sleeve, thus achieving busbar fixation and connection. Busbars are generally coated with an insulating layer to enhance the insulation effect between different phases, thereby shortening the distance between different phase busbars and reducing the overall size of the switchgear. However, the busbar overlap ends must meet conductivity and current carrying requirements, so an insulating layer cannot be installed. In the aforementioned busbar support insulator, the insulating wings provide insulation protection for the busbar overlap structure within the mounting groove, ensuring good insulation between the two phases.

[0004] However, since the gap between the lap joint of the busbar and the insulating wing cannot be completely eliminated, the improvement in insulation effect brought by the insulating wing is relatively limited. Moreover, the insulating wing can only provide insulation protection for both sides of the busbar. The lap joint of the busbar remains open and uninsulated in the axial direction of the bolt. A large axial insulation distance is still required between the lap joint of the busbar and other conductive parts in this direction. Furthermore, the bolt protrudes from the busbar, which can easily cause point discharge. Therefore, the requirement for the above-mentioned axial insulation distance is even greater in actual use, which is not conducive to the miniaturization of switchgear. Summary of the Invention

[0005] One of the objectives of this invention is to provide a supporting insulator to solve the technical problem in the prior art that the conductive ends of the conductive busbar cannot be fully insulated, resulting in a large insulation distance requirement between the conductive ends of the conductive busbar and other conductive components, which makes it difficult to achieve miniaturization of switching equipment. Another object of the present invention is to provide a switching device to solve the above-mentioned technical problems.

[0006] To achieve the above objectives, the technical solution for the supporting insulator provided by this invention is as follows: A supporting insulator includes an insulator and an insert disposed at one end of the insulator. The insulator forms a fully enclosed structure for the insert. The insert is a conductive element and has at least two insertion slots for inserting and communicating with the conductive ends of a conductive busbar. The insulator has an entry point for the conductive busbar to pass through at a position corresponding to the slot opening.

[0007] As a further improvement, the width of the through-hole is greater than the width of the slot, and the width of the through-hole is sufficient to fit tightly with the insulation layer of the conductive busbar.

[0008] As a further improvement, the width of the through-hole is less than or equal to the width of the slot, and the width of the through-hole is sufficient to fit tightly with the conductive end of the conductive busbar.

[0009] As a further improvement, at least one inner wall surface of the insertion slot is provided with a mating protrusion for tight engagement with the conductive end of the conductive busbar.

[0010] As a further improvement, the insert includes a main body and a reinforcing part, with a insertion slot disposed on the main body. The insulator includes an insulating shell uniformly wrapped around the surface of the main body and a columnar insulating base. The insulating shell is integrally disposed at one axial end of the insulating base, and the reinforcing part protrudes from the main body and extends into the insulating base.

[0011] As a further improvement, the main body is a cuboid structure, and the reinforcing part is a cylindrical structure.

[0012] As a further improvement, the two ends of the insertion slot in the slot length direction penetrate the end face of the insert in the corresponding direction, and the insulator forms an insulating wall at the two ends of the insertion slot in the slot length direction to provide insulation protection and limit the conductive ends of the conductive busbar.

[0013] As a further improvement, the width direction of the insertion slot is in the same direction as the axis of the insulator.

[0014] As a further improvement, at least two plug slots are arranged in pairs, with the openings of the two plug slots in the same pair facing opposite directions.

[0015] The beneficial effects are as follows: The supporting insulator provided by this invention is an improvement over the prior art. The insert in this supporting insulator can be plugged into the conductive end of the busbar to achieve a stable connection and electrical conduction between the insert and the busbar, thereby supporting the busbar and enabling different busbars to conduct to each other. Because the insert is completely enclosed by the insulator, and the conductive end can be completely inserted into the insert, the conductive end forms a fully enclosed insulation, resulting in better insulation performance compared to the prior art. Therefore, the insulation distance requirements between the conductive end of the busbar and other conductive components in the switchgear can be reduced in all directions, which is beneficial for miniaturizing the switchgear.

[0016] To achieve the above objectives, the technical solution of the switching device provided by the present invention is as follows: A switchgear includes a frame, a supporting insulator fixed on the frame, and a conductive bar fixed to the supporting insulator. The supporting insulator includes an insulator and an insert disposed at one end of the insulator. The insulator forms a fully enclosed structure for the insert. The insert is a conductive element and is provided with at least two insertion slots for the conductive ends of the conductive bar to be inserted and connected. The insulator is provided with an entry point for the conductive bar to pass through at a position corresponding to the slot opening of the insertion slot.

[0017] As a further improvement, the width of the through-hole is greater than the width of the slot, and the width of the through-hole is sufficient to fit tightly with the insulation layer of the conductive busbar.

[0018] As a further improvement, the width of the through-hole is less than or equal to the width of the slot, and the width of the through-hole is sufficient to fit tightly with the conductive end of the conductive busbar.

[0019] As a further improvement, at least one inner wall surface of the insertion slot is provided with a mating protrusion for tight engagement with the conductive end of the conductive busbar.

[0020] As a further improvement, the insert includes a main body and a reinforcing part, with a insertion slot disposed on the main body. The insulator includes an insulating shell uniformly wrapped around the surface of the main body and a columnar insulating base. The insulating shell is integrally disposed at one axial end of the insulating base, and the reinforcing part protrudes from the main body and extends into the insulating base.

[0021] As a further improvement, the main body is a cuboid structure, and the reinforcing part is a cylindrical structure.

[0022] As a further improvement, the two ends of the insertion slot in the slot length direction penetrate the end face of the insert in the corresponding direction, and the insulator forms an insulating wall at the two ends of the insertion slot in the slot length direction to provide insulation protection and limit the conductive ends of the conductive busbar.

[0023] As a further improvement, the width direction of the insertion slot is in the same direction as the axis of the insulator.

[0024] As a further improvement, at least two plug slots are arranged in pairs, with the openings of the two plug slots in the same pair facing opposite directions.

[0025] The beneficial effects are as follows: The switching device provided by this invention is an improvement over the prior art. In this switching device, the insert supporting the insulator can be plugged into the conductive end of the busbar to achieve a stable connection and electrical conduction between the insert and the busbar, thereby supporting the busbar and enabling different busbars to conduct to each other. Since the insert is completely wrapped by the insulator, and the conductive end can be completely inserted into the insert, the conductive end forms a fully enclosed insulation, which has a better insulation effect than the prior art. Therefore, the insulation distance requirement between the conductive end of the busbar and other conductive components in the switching device in all directions can be reduced, which is beneficial to the miniaturization of the switching device. Attached Figure Description

[0026] Figure 1 This is a cross-sectional view of the supporting insulator in Embodiment 1 of the switching device of the present invention; Figure 2 This is a partial cross-sectional view of the supporting insulator in Embodiment 1 of the switching device of the present invention; Figure 3 This is a partial cross-sectional view of the supporting insulator from another perspective in Embodiment 1 of the switching device of the present invention; Figure 4 This is a partial cross-sectional view of the supporting insulator in Embodiment 2 of the switching device of the present invention.

[0027] Explanation of reference numerals in the attached figures: 1. Conductive busbar; 11. Conductive end; 2. Insulating layer; 3. Insulator; 31. Insulating base; 32. Insulating shell; 33. Penetration port; 34. Insulating wall; 4. Insert; 41. Main body; 42. Reinforcing part; 43. Insertion groove; 44. Mating protrusion; 5. Fixing and mounting parts. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the embodiments.

[0029] To address the problems in the prior art, the basic concept of this invention is to fully enclose the insulator with an insert and insert all the conductive ends of the conductive busbar into the insert, thereby achieving full insulation of the conductive ends of the conductive busbar.

[0030] Specific embodiment 1 of the switching device provided by the present invention: A switchgear includes a frame, a supporting insulator fixed to the frame, and a conductive bar 1 fixed to the supporting insulator. In this embodiment, the switchgear is a switch cabinet, therefore the frame of the switchgear is the cabinet of the switch cabinet.

[0031] See appendix Figure 2 The surface of the conductive busbar 1 is coated with an insulating layer 2 by fluidization. The ends of the conductive busbar 1 along its length are not covered with the insulating layer 2, forming exposed conductive ends 11 for conductive connection with other conductive components.

[0032] See appendix Figure 1 and attached Figure 2 The supporting insulator includes an insulator 3 and an insert 4 disposed at one end of the insulator 3. The insulator 3 is made of epoxy resin, and the insert 4 is a copper conductive component. The insert 4 is integrally cast into the insulator 3, and the insulator 3 forms a fully enclosed structure for the insert 4.

[0033] The insert 4 includes an integrally formed main body 41 and a reinforcing part 42. The main body 41 has a cuboid structure, and the reinforcing part 42 has a cylindrical structure. The reinforcing part 42 is located at the center of one end face of the main body 41, and the cross-sectional dimension of the reinforcing part 42 is smaller than that of the main body 41. The main body 41 has two insertion slots 43 that can be inserted into the conductive ends 11 of the conductive busbar 1. The two insertion slots 43 are the same size and shape but have opposite opening orientations. The width direction of the insertion slots 43 is in the same direction as the axis of the insulator 3. (See attached diagram) Figure 3 The two ends of the insertion slot 43 in the slot length direction penetrate the end face of the insert 4 in the corresponding direction.

[0034] The aforementioned insertion slot 43 conforms to the conventional installation requirements of the conductive busbar 1. In other embodiments, the shape of the insertion slot 43 can be determined according to specific usage requirements. For example, the depth directions of the two insertion slots 43 may be perpendicular to each other, or the length directions of the two insertion slots 43 may be in the same direction as the axis of the insulator 3. In this embodiment, the two ends of the insertion slot 43 in the length direction penetrate through the end face of the insert 4 in the corresponding direction, which can minimize the size of the insert 4. In other embodiments, the length direction of the insertion slot 43 may not penetrate through the end face of the insert 4.

[0035] The insulator 3 includes a columnar insulating base 31 and an insulating shell 32 located at one end of the insulating base 31. The insulating shell 32 uniformly wraps around the surface of the main body 41 of the insert 4, and an inlet 33 is provided on the insulating shell 32 at a position corresponding to the opening of the insertion groove 43 for the conductive busbar 1 to pass through. Insulating walls 34 are formed at both ends of the insertion groove 43 along its length to provide insulation protection and limit the conductive section of the conductive busbar 1. The reinforcing part 42 of the insert 4 extends into the insulating base 31 and is coaxial with the insulating base 31. The wall thickness of the insulating base 31 is greater than the wall thickness of the insulating shell 32. The reinforcing part 42 increases the bonding strength between the insert 4 and the insulator 3, and improves the stability of the insert 4.

[0036] During use, the conductive ends 11 of the two conductive busbars 1 that need to be connected to each other are respectively inserted into the two insertion slots 43 on the insert 4. The conductive ends 11 are tightly fitted with the side wall of the corresponding insertion slot 43 so that a stable connection is formed between the conductive busbar 1 and the insert 4 and the two are mutually conductive, thereby enabling the two conductive busbars 1 to be mutually conductive.

[0037] In this embodiment, there is no need for bolts to fix the conductive busbar 1 and the insert 4. Therefore, the conductive end 11 of the conductive busbar 1 does not need to be machined with a connection hole for the bolt to pass through, which reduces the processing steps of the conductive busbar 1 and also reduces the time of connection operation between the conductive busbar 1 and the supporting insulator.

[0038] To ensure a stable and reliable connection between the conductive busbar 1 and the insert 4, and to facilitate on-site installation while maintaining a secure connection, this embodiment provides mating protrusions 44 on both sides of the inner wall of the insertion slot 43 on the insert 4. The mating protrusions 44 are interference-fitted with the conductive end 11 surface of the conductive busbar 1. In different embodiments of this embodiment, the mating protrusions 44 can be strip-shaped or dot-shaped; the specific form can be designed as needed and will not be elaborated further. The mating protrusions 44 ensure that the conductive busbar 1 can be tightly inserted into the insertion slot 43, improving the stability of the conductive busbar 1 and the reliability of the connection between the conductive busbar 1 and the insert 4.

[0039] In this embodiment, the inner wall of the inlet 33 on the insulating shell 32 is tightly fitted with the insulating layer 2 of the conductive busbar 1. Therefore, the inlet 33 must have enough space to accommodate the insulating layer 2. Thus, the width of the inlet 33 needs to be greater than the width of the slot 43. Specifically, the width of the inlet 33 needs to match the dimensions of the insulating layer 2. This arrangement ensures that the conductive end 11 on the conductive busbar 1 forms a fully enclosed insulation, avoiding gaps that would affect the insulation effect.

[0040] Compared to existing technologies, the supporting insulator in this embodiment allows the insert 4 to be fully enclosed by the insulator 3, and forms a fully enclosed insulation on the conductive end 11 of the conductive busbar 1. Moreover, the supporting insulator in this embodiment achieves conductive connection with the conductive busbar 1 through plug-in engagement, eliminating the need for bolts and avoiding bolt damage to insulation protection and the occurrence of tip discharge. Therefore, it can effectively improve the insulation effect at the conductive end 11 of the conductive busbar 1 and reduce the insulation distance requirement between the conductive end 11 of the conductive busbar 1 and other conductive components in the switchgear, thereby facilitating the miniaturization of the switchgear.

[0041] The end of the insulating base 31 away from the insulating shell 32 is integrally cast with a fixing mounting part 5. The fixing mounting part 5 is provided with threaded holes so that the insulator 3 can be fixedly installed on the frame of the switchgear by bolts.

[0042] In this embodiment, the supporting insulator is generally used with its axis horizontal and the two insertion slots 43 on the insert 4 arranged vertically. In other embodiments of this embodiment, the supporting insulator can also be rotated 90 degrees around its axis so that the two insertion slots 43 on the insert 4 are arranged horizontally. Alternatively, the supporting insulator can be used with its axis vertical.

[0043] Specific embodiment 2 of the switching device provided by the present invention: This embodiment is based on Embodiment 1, and the difference from Embodiment 1 is as follows (see Appendix). Figure 4 In this embodiment, the width of the through-hole 33 is less than or equal to the width of the slot 43, so that the through-hole 33 can form a tight fit with the surface of the conductive end 11 of the conductive busbar 1. The specific width of the through-hole 33 needs to be adapted to the size of the conductive end 11 of the conductive busbar 1. In this embodiment, the conductive end 11 of the conductive busbar 1 can also form a fully enclosed insulation, which can also provide a good insulation effect.

[0044] Specific embodiment 3 of the switching device provided by the present invention: This embodiment is based on Embodiment 1. The difference between this embodiment and Embodiment 1 is that the inner wall of the insertion slot does not have a mating protrusion, and the inner wall of the insertion slot is in contact with the conductive end face of the conductive busbar.

[0045] Specific embodiment 4 of the switching device provided by the present invention: This embodiment is based on Embodiment 1. The difference between this embodiment and Embodiment 1 is that the insert in this embodiment only includes the main body. In order to strengthen the connection between the main body and the insulator, the thickness of the insulating shell can be increased.

[0046] Specific embodiment 5 of the switching device provided by the present invention: This embodiment is based on Embodiment 1. The difference between this embodiment and Embodiment 1 is that the main body is provided with two pairs of insertion slots. The slot openings of the same pair of insertion slots face opposite directions, while the slot depths of different pairs of insertion slots are perpendicular to each other. In this embodiment, four conductive busbars can be inserted into the main body and all four conductive busbars can be made conductive.

[0047] Specific embodiment 6 of the switching device provided by the present invention: This embodiment is based on Embodiment 1. The difference between this embodiment and Embodiment 1 is that the main body is provided with three insertion slots, and the orientation of the slot openings of the three insertion slots is set as needed.

[0048] Specific embodiment 7 of the switching device provided by the present invention: This embodiment is based on Embodiment 1. The difference between this embodiment and Embodiment 1 is that the main body is a hexagonal prism or triangular prism structure, and the insertion groove is set on the circumferential side of the main body.

[0049] Specific embodiments of the supporting insulator provided by the present invention: The supporting insulator is the supporting insulator in the specific embodiment of the above-mentioned switchgear, and will not be described again.

[0050] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A supporting insulator, comprising an insulator and an insert disposed at one end of the insulator, characterized in that, The insulator forms a fully enclosed structure for the insert, which is a conductive component. The insert has at least two insertion slots for the conductive ends of the conductive busbar to be inserted and connected. The insulator has an entry point for the conductive busbar to pass through at a position corresponding to the slot opening.

2. The supporting insulator according to claim 1, characterized in that, The width of the insertion opening is greater than the width of the slot, and the width of the insertion opening is sufficient to fit tightly with the insulation layer of the conductive busbar.

3. The supporting insulator according to claim 1, characterized in that, The width of the insertion port is less than or equal to the width of the slot, and the width of the insertion port is sufficient to fit tightly with the conductive end of the conductive busbar.

4. The supporting insulator according to any one of claims 1-3, characterized in that, At least one inner wall of the insertion slot is provided with a mating protrusion for tight engagement with the conductive end of the conductive busbar.

5. The supporting insulator according to any one of claims 1-3, characterized in that, The insert includes a main body and a reinforcing part. The insertion slot is disposed on the main body. The insulator includes an insulating shell that is uniformly wrapped around the surface of the main body and a columnar insulating base. The insulating shell is integrally disposed at one axial end of the insulating base. The reinforcing part protrudes from the main body and extends into the insulating base.

6. The supporting insulator according to claim 5, characterized in that, The main body is a rectangular parallelepiped structure, while the reinforcing part is a cylindrical structure.

7. The supporting insulator according to any one of claims 1-3, characterized in that, The two ends of the insertion slot in the slot length direction penetrate the end face of the insert in the corresponding direction. The insulator forms an insulating wall at both ends of the insertion slot in the slot length direction to provide insulation protection and limit the conductive ends of the conductive busbar.

8. The supporting insulator according to any one of claims 1-3, characterized in that, The width of the insertion slot is in the same direction as the axis of the insulator.

9. The supporting insulator according to any one of claims 1-3, characterized in that, There are at least two sockets arranged in pairs, with the openings of the two sockets in the same pair facing opposite directions.

10. A switchgear, comprising a frame, a supporting insulator fixed to the frame, and a conductive bar fixed to the supporting insulator, characterized in that, The supporting insulator is the supporting insulator as described in any one of claims 1-9 above.

Images