Vacuum arc-extinguishing chamber coating structure

Abstract

The utility model belongs to the field of vacuum arc extinguish chambers, and discloses a vacuum arc extinguish chamber coating structure, which comprises a vacuum arc extinguish chamber and a silicon rubber coating layer coated outside the vacuum arc extinguish chamber, and is characterized in that the silicon rubber coating layer is provided with an upper skirt edge and a main body coating part which are distributed along the axial direction; the top end of the upper skirt edge extends towards the inner side to form a top skirt edge, and 2-4 bulges which are distributed in the circumferential direction and are mutually spaced are arranged on the top surface of the top skirt edge from inside to outside; and a plurality of mutually spaced wave edges are distributed on the outer peripheral surface of the main body coating part along the axial direction. According to the utility model, the shearing external force borne by the vacuum arc-extinguishing chamber can be reduced, the vacuum arc-extinguishing chamber can better adapt to the insulating cylinder, the voltage-resistant strength is high, and the closing bounce value of the whole high-voltage switch is small.

Description

Technical Field

[0001] The utility model belongs to the technical field of vacuum arc extinguishing chambers, and in particular relates to a vacuum arc extinguishing chamber covering structure. Background Art

[0002] The vacuum interrupter is an electric vacuum device installed on high-voltage switchgear. One type of outdoor high-voltage switch is to cover the vacuum interrupter with silicone rubber and then press it into the insulating cylinder to achieve high-voltage insulation capability and meet the mechanical and electrical performance parameter requirements of the vacuum switch.

[0003] The existing vacuum interrupter has a silicone rubber outer structure, such as a vacuum interrupter disclosed in the utility model patent with patent number CN201020542901.0, which includes a vacuum interrupter body and an outer silicone buffer layer. The outer silicone buffer layer of this technical solution is a skirt structure. In the modern power transmission and distribution industry, the vacuum interrupter sealing structure is more and more widely used. This structure effectively increases the bonding effect between its surface and the sealing technology, and prevents the breakdown phenomenon caused by the vacuum interrupter not being sealed in place.

[0004] However, the coating structure of the existing vacuum interrupter such as the above-mentioned technical solution has problems of unreasonable design and poor applicability, which leads to poor stress and air leakage after the vacuum interrupter is wrapped with silicone, and also leads to poor matching with the insulating tube. After being assembled on the high-voltage switch, the performance is not stable enough, and sometimes problems such as large contact closing bounce value and high voltage breakdown occur. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a vacuum arc chamber covering structure to solve the problems that the existing vacuum arc chamber covering structure has poor compatibility with the insulating tube and has a high bounce value when the contacts are closed.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A vacuum arc chamber covering structure comprises a vacuum arc chamber and a silicone rubber covering layer covering the outer side of the vacuum arc chamber, characterized in that the silicone rubber covering layer has an upper skirt and a main body covering portion distributed along the axial direction; the top end of the upper skirt extends inwardly to form a top skirt, and the top surface of the top skirt is provided with 2-4 protrusions distributed circumferentially and spaced from each other from the inside to the outside; the outer peripheral surface of the main body covering portion is distributed with a plurality of ridges spaced from each other along the axial direction.

[0008] In a possible implementation, the outer diameter of each of the corrugations gradually increases from one end of the main body covering portion close to the upper skirt to the other end, so that the main body covering portion has a cone-shaped structure as a whole.

[0009] In a possible implementation, the conical structure enables the main body covering portion as a whole to have a taper of 1°-3° relative to the axial direction.

[0010] In a possible implementation, the corrugated ridge has a thickness k and an outer end rounded arc Re, wherein the thickness k is 2-4 mm, and the outer end rounded arc Re is 1-2 mm.

[0011] In a possible implementation, the conical structure enables the main body covering portion to have a small diameter end and a large diameter end, the minimum outer diameter Φb of the ridges at the small diameter end is 80-100 mm, and the maximum outer diameter Φg of the ridges at the outer diameter end is 90-110 mm.

[0012] In a possible implementation, the spacing j between the corrugation ridge with the maximum outer diameter at the large-diameter end and the adjacent corrugation ridges is greater than the spacing between the remaining adjacent corrugation ridges, and the spacing j is 4-8 mm.

[0013] In a possible implementation, the thickness c of the main body covering portion is 2-4 mm;

[0014] A chamfered arc Ra is provided between the upper skirt and the top skirt, and the chamfered arc Ra is 5-7 mm.

[0015] In a possible implementation, the height of the protrusion of the top skirt increases gradually from the outside to the inside, and the cross-section of the protrusion is triangular.

[0016] In a possible implementation, two protrusions are provided, and the height m of the protrusion located on the inner side is 1-2 mm, and the height n of the protrusion located on the outer side is 1.5-2.5 mm.

[0017] In a possible implementation, the silicone rubber coating layer further comprises a lower skirt integral with the main body coating portion, and a contraction portion extending inwardly from the bottom end of the lower skirt.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The vacuum interrupter sheathing structure of the utility model can reduce the shearing force on the vacuum interrupter, better adapt to the insulating cylinder, have high voltage resistance, and have a small closing bounce value of the high-voltage switch assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a vacuum arc chamber coating structure, which also shows the cross-sectional structure of the silicone rubber coating layer.

[0021] Figure 2 The present invention is a schematic diagram showing the dimensions of each part of the silicone rubber coating layer of a vacuum arc chamber coating structure.

[0022] In the figure: 1-vacuum interrupter; 2-silicone rubber coating layer; 21-main body coating portion; 211-corrugated edge; 22-upper skirt; 221-top skirt; 222-protrusion; 23-lower skirt; 231-contraction portion. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with specific implementation methods.

[0024] Please refer to Figure 1 and Figure 2 As shown, a vacuum interrupter 1 covering structure according to an embodiment of the present application comprises a vacuum interrupter 1 and a silicone rubber covering layer 2 covering the outside of the vacuum interrupter 1 .

[0025] The silicone rubber coating 2 is encapsulated on the outside of the substantially cylindrical vacuum interrupter 1. After the vacuum interrupter 1 is coated with the silicone rubber coating 2, it is placed in an insulating tube to achieve high-voltage insulation capability and meet the mechanical and electrical performance parameter requirements of the vacuum switch.

[0026] In an embodiment of the present application, the silicone rubber coating layer 2 has an upper skirt 22 and a main body covering portion 21 distributed along the axial direction; the top end of the upper skirt 22 extends inwardly to form a top skirt 221, and the top surface of the top skirt 221 is provided with 2-4 circumferentially distributed and mutually spaced protrusions 222 from the inside to the outside; the outer peripheral surface of the main body covering portion 21 is distributed along the axial direction with a plurality of mutually spaced ridges 211.

[0027] Among them, the multiple protrusions 222 arranged on the top skirt 221 can make the upper end surface of the silicone rubber pressed against the inner top surface of the insulating tube during installation. The multiple protrusions 222 are flattened, which increases the elasticity of the contact surface, reduces the stiffness and vibration when closing the switch, achieves better buffering, and reduces bounce; and the number of protrusions 222 should not be too many or too few. If there are more, the resistance becomes larger, and the upper end surface of the silicone rubber cannot stick to the inner surface of the insulating tube; if the number is less (only 1), the force is uneven and the buffering effect becomes worse. The corrugated ridges 211 arranged at several intervals on the main covering part 21 can make the whole formed by the covering vacuum arc chamber 1 elastically supported by the corrugated ridges 211 in the insulating tube, and can maintain more stability and effective fit with the inner wall of the insulating tube when subjected to shear external force, and can avoid leakage caused by poor force.

[0028] Regarding the structure of the ridge 211, it can be a continuous wave-like structure or a structure with parallel top and bottom surfaces to form a thickness. In the specific implementation process, the latter is preferred, and through the mutually spaced arrangement, the waves can have better freedom to release stress after being subjected to force.

[0029] In one embodiment, the outer diameter of each of the ridges 211 gradually increases from one end of the main body covering portion 21 close to the upper skirt 22 to the other end, so that the main body covering portion 21 has a cone-shaped structure as a whole.

[0030] In this way, the vacuum arc extinguishing chamber 1 formed by the coating can have a cone-shaped structure as a whole, so that it can be installed in matching with the inner wall of the insulating cylinder which also has a cone, so that it has better adaptability and can be more stable after installation.

[0031] Furthermore, in order to better adapt to the inner cavity of the insulating cylinder with a smaller taper, the conical structure makes the main body covering portion 21 have a taper of 1°-3° relative to the axial direction. The taper can also be understood as the angle between the connecting line formed by connecting the outer sides of each ridge 211 and the axial direction.

[0032] In order to improve the mobility of the corrugated ribs 211 when responding to sub-installation and external shearing force, the corrugated ribs 211 further have an outer end chamfer Re of 1-2 mm.

[0033] Meanwhile, the corrugated rib 211 also has a thickness k, and the thickness k is 2-4 mm.

[0034] In the embodiment of the present application, the conical structure enables the main body covering portion 21 to have a small diameter end and a large diameter end, the minimum outer diameter Φb of the ridge 211 at the small diameter end is 80-100 mm, and the maximum outer diameter Φg of the ridge 211 at the outer diameter end is 90-110 mm.

[0035] Such a size arrangement of the corrugations 211 can make the vacuum interrupter 1 covered with the silicone rubber coating layer 2 better matched with the inner cavity of the insulating cylinder as a whole.

[0036] Furthermore, the spacing j between the ridge 211 with the maximum outer diameter at the large diameter end and the adjacent ridges 211 is greater than the spacing between the remaining adjacent ridges 211, and the spacing j is 4-8 mm.

[0037] In this way, by setting the interval j, this end does not match the insulating tube, thereby improving the fault tolerance of the silicone rubber shape.

[0038] Furthermore, in order to better protect the arc extinguishing chamber porcelain shell from excessive pressure, the thickness c of the main body covering portion 21 is 2-4 mm. If the thickness c is too small, the effect of protecting the arc extinguishing chamber porcelain shell from excessive pressure is not obvious.

[0039] At the same time, a chamfered arc Ra is provided between the upper skirt 22 and the top skirt 221, and the chamfered arc Ra is 5-7 mm. In this way, it can better match the corner of the top of the insulation tube and avoid interference with the inner wall of the insulation tube.

[0040] In a preferred embodiment of the ridge 211 , the height of the protrusion 222 of the top skirt 221 increases from the outside to the inside, and the cross-section of the protrusion 222 is a triangle.

[0041] The protrusion 222 with a triangular cross-section can have better support, and can achieve better support with its elasticity. In addition, through the incremental change in height from the outside to the inside, when the pressure is greater, it can be elastically supported through the protrusion 222 of smaller height on the outside, further reducing the stiffness and vibration when closing the switch, and achieving better buffering.

[0042] Specifically, two protrusions 222 are provided, and the height m of the protrusion 222 located on the inner side is 1-2 mm, and the height n of the protrusion 222 located on the outer side is 1.5-2.5 mm.

[0043] In order to protect the end cover of the vacuum interrupter 1 from shearing force, in the embodiment of the present application, the silicone rubber coating layer 2 also has a lower skirt 23 integral with the main body covering portion 21, and a contraction portion 231 extending inward from the bottom end of the lower skirt 23. Correspondingly, the contraction portion 231 also has a height h. A narrow corrugation ridge is also provided on the outer side of the lower skirt 23, which is flush with the corrugation ridge 211 of the maximum outer diameter at the bottom end of the main body covering portion 21 in the axial direction to connect with it.

[0044] Preferred embodiment:

[0045] Please refer to Figure 2 As shown, a vacuum arc chamber 1 covering structure of an embodiment of the present application includes the thickness c of the silicone of the main covering part 21, the minimum outer diameter Φb of the corrugated ridge 211 at the small diameter end, the outer diameter Φf of the lower large diameter end transitioned through the taper i, and then reaching the lower maximum outer diameter Φg through the interval j, the height m and height n of the two annular protrusions at the upper end, the chamfered arc Ra of the upper end surface, the thickness k of a single corrugated ridge 211 and the chamfered arc Re at the outer end, and the height h of the arc chamber end cover to protect it from shear force.

[0046] The above dimensions are respectively c=3mm, Φb=90mm, angle i=2°, Φf=96mm, j=6mm, Φg=98mm, height m=1.5mm, height n=2mm, Ra=R6mm, k=3mm, Re=R1.5mm.

[0047] Implementation principle: The setting of the two protrusions 222 can better achieve buffering when the switch is closed, reduce the closing bounce, and the setting of the size and shape a, b, c, e, f, g, i, j, k improves the matching with the insulating tube, reduces the pressure on the vacuum interrupter 1, the voltage resistance performance of the whole machine is better, and the closing bounce is smaller.

[0048] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention. The protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A vacuum interrupter (1) covering structure, comprising a vacuum interrupter (1) and a silicone rubber covering layer (2) covering the outside of the vacuum interrupter (1), characterized in that: The silicone rubber coating layer (2) comprises an upper skirt (22) and a main body coating portion (21) distributed along the axial direction; the top end of the upper skirt (22) extends inwardly to form a top skirt (221), and the top surface of the top skirt (221) is provided with 2 to 4 convexities (222) distributed circumferentially and spaced from each other from the inside to the outside; and the outer peripheral surface of the main body coating portion (21) is distributed axially with a plurality of ridges (211) spaced from each other.

2. A vacuum interrupter (1) covering structure according to claim 1, characterized in that: The outer diameter of each of the ridges (211) gradually increases from one end of the main body covering portion (21) close to the upper skirt (22) to the other end, so that the main body covering portion (21) has a cone-shaped structure as a whole.

3. A vacuum interrupter (1) covering structure according to claim 2, characterized in that: The conical structure enables the main body covering portion (21) to have a taper of 1°-3° relative to the axial direction as a whole.

4. A vacuum interrupter (1) covering structure according to claim 2, characterized in that: The ridge (211) has a thickness k and an outer end rounded arc Re, wherein the thickness k is 2-4 mm and the outer end rounded arc Re is 1-2 mm.

5. A vacuum interrupter (1) covering structure according to claim 2, characterized in that: The conical structure enables the main body covering portion (21) to have a small diameter end and a large diameter end, the minimum outer diameter Φb of the ridge (211) at the small diameter end is 80-100 mm, and the maximum outer diameter Φg of the ridge (211) at the outer diameter end is 90-110 mm.

6. A vacuum interrupter (1) covering structure according to claim 5, characterized in that: The spacing j between the ridge (211) with the largest outer diameter at the large diameter end and the adjacent ridges (211) is greater than the spacing between the other adjacent ridges (211), and the spacing j is 4-8 mm.

7. A vacuum interrupter (1) covering structure according to claim 1, characterized in that: The thickness c of the main body covering portion (21) is 2-4 mm; A chamfered arc Ra is provided between the upper skirt (22) and the top skirt (221), and the chamfered arc Ra is 5-7 mm.

8. A vacuum interrupter (1) covering structure according to claim 1, characterized in that: The height of the protrusion (222) of the top skirt (221) increases gradually from the outside to the inside, and the cross-section of the protrusion (222) is triangular.

9. A vacuum interrupter (1) covering structure according to claim 8, characterized in that: There are two protrusions (222), and the height m of the protrusion (222) located on the inner side is 1-2 mm, and the height n of the protrusion (222) located on the outer side is 1.5-2.5 mm.

10. A vacuum interrupter (1) covering structure according to any one of claims 1 to 9, characterized in that: The silicone rubber coating layer (2) further comprises a lower skirt (23) which is integral with the main body coating portion (21), and a contraction portion (231) extending inwardly from the bottom end of the lower skirt (23).

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