CN210778267U - Sealing insulation structure of connecting terminal of dry power electronic capacitor - Google Patents
Sealing insulation structure of connecting terminal of dry power electronic capacitor Download PDFInfo
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- CN210778267U CN210778267U CN201922112661.4U CN201922112661U CN210778267U CN 210778267 U CN210778267 U CN 210778267U CN 201922112661 U CN201922112661 U CN 201922112661U CN 210778267 U CN210778267 U CN 210778267U
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Abstract
The utility model discloses a dry-type power electronic capacitor's binding post's sealed insulation structure, binding post's sealed insulation structure is by the insulator, the dead circle nut, the cardboard packing ring, the conducting rod, sealing insulator, first sealing washer and second sealing washer constitute, the conducting rod passes middle through-hole from sealing insulator bottom square hole, the second sealing washer is overlapped in sealing insulator's cylindrical groove, sealing insulator arranges the hexagon square hole of condenser case lid in, first sealing washer overlaps on conducting rod upper portion and slides to sealing insulator top, the insulator cover is on sealing insulator upper portion, place the cardboard packing ring in the top recess of insulator, install dead circle nut on conducting rod upper portion, screw up, the extrusion force makes the structure closely combine, play sealed effect. The utility model discloses simple structure, convenient assembling, sealed insulating properties is good, makes the long-term safe, reliable operation of condenser.
Description
Technical Field
The utility model belongs to the power capacitor field, concretely relates to dry-type power electronic capacitor's binding post's sealed insulation system.
Background
In high-power converters such as high-voltage frequency converters of dozens of megawatts, high-speed motor car converters, high-power STATCOM, direct-current capacitors for flexible direct-current transmission engineering and the like, high-voltage and high-capacity power electronic capacitors are used.
In recent years, these power electronic capacitors have come to adopt a dry structure. The common characteristics of the capacitors are high voltage, large capacity and heavy weight, and the maximum power electronic capacitor reaches 200 kg.
The traditional oil-immersed power electronic capacitor is light in weight. Due to the hidden danger of oil leakage, the sealing structure is the key influencing the operation reliability and safety of the power electronic capacitor.
For dry-type power electronic capacitors, the requirement for sealing performance is relatively low, the production processes are different, and the power electronic capacitors are relatively heavy.
The structure of traditional binding post of oily formula power electronic capacitor is applied to dry capacitor, has the problem: the sealing ring in contact with the cover plate needs to be coated with a sealant, and the next step can be carried out the next day; the assembly parts are more, and the assembly process is complex; the core is heavy and the connection between the conducting rod and the core is inconvenient. Although the traditional sealing structure has good performance, the production efficiency is low.
Therefore, a new sealing and insulating structure is needed to satisfy the sealing and insulating performance and improve the production efficiency.
Disclosure of Invention
In order to solve the problem that the operation is complicated and production efficiency is low, the utility model provides a dry-type power electronic capacitor (hereinafter referred to as "condenser")'s binding post's sealed insulation system.
The utility model provides a technical scheme as follows that the problem adopts.
The capacitor comprises a case shell, a case cover, a connecting terminal, a core and filled resin. The sealing and insulating structure of the wiring terminal consists of an insulator, a fixed round nut, a paperboard gasket, a conductive rod, a sealing insulator, a first sealing ring and a second sealing ring. The wiring terminal is mounted on the cover of the capacitor. The conducting rod penetrates through the middle through hole from the square hole at the bottom of the sealing insulator; the second sealing ring is sleeved in the cylindrical groove of the sealing insulator; the middle hexagonal part of the sealing insulator is just arranged in the hexagonal square hole of the capacitor box cover; the first sealing ring is sleeved on the upper part of the conducting rod and slides to the top of the sealing insulator; the insulator is sleeved on the upper part of the sealing insulator, and the upper part of the sealing insulator is contacted with the convex groove at the bottom of the insulator; placing a paperboard gasket in a groove at the top of the insulator; the fixed round nut is arranged on the upper part of the conducting rod and screwed down, the first sealing ring is in close contact with the upper part of the sealing insulator, the convex groove at the bottom of the insulator and the conducting rod through extrusion force, and meanwhile, the second sealing ring is in close contact with the upper part of the sealing insulator and the contact part of the box cover to play a role in sealing.
The insulator is made of SMC composite materials, 4 skirt edges are provided with grooves at the tops, convex grooves are formed at the bottoms, inner holes are formed in the middles, and the creepage distance is 82 mm.
The fixed round nut is made of brass, the middle inner hole is an internal thread, and the outer surface is plated with nickel.
The paperboard gasket material is electrical paperboard.
The conducting rod is made of brass, the upper end of the conducting rod is provided with an external thread, the middle part of the conducting rod is a polished rod, the bottom of the conducting rod is square, the outer surface of the conducting rod is plated with nickel, and the bottom of the conducting rod is plated with tin.
The sealing insulator is made of a tough nylon material, a through hole is formed in the middle of the sealing insulator, the upper portion of the sealing insulator is cylindrical, a hexagon with the height of 2.8mm is arranged in the middle of the sealing insulator, the lower portion of the sealing insulator is cylindrical and provided with a cylindrical groove, the inner end face of the groove is lower than the outer end face by 0.2mm, a circular groove is formed in the lower portion of the sealing insulator, and a square hole with the depth.
The first sealing ring is made of silicon rubber, is O-shaped, has the inner diameter of 16mm, the thickness of 1.2mm and the Shore hardness of 40-45 ℃.
The second sealing ring is made of silicon rubber, is O-shaped, has an inner diameter of 45mm and a thickness of 3mm, and has a Shore hardness of 40-45 ℃.
Furthermore, the square part at the bottom of the conducting rod is in close contact with the square hole at the bottom of the sealing insulator, and sealant is coated at the square part at the bottom of the conducting rod during assembly.
Furthermore, the assembly parts except the first sealing ring and the second sealing ring are all made of hard materials, and high-precision materials are needed to enable the first sealing ring and the second sealing ring to be in perfect contact with each other.
Furthermore, the alternating current withstand voltage level of the sealing insulation structure of the wiring terminal reaches 12 kV alternating current, and the appearance and the insulation performance are unchanged after 5 times of high and low temperature cycle tests at 40-85 ℃.
The utility model has the beneficial technical effects that: according to the structure, the characteristics and the working condition of the dry-type power electronic capacitor, the sealing and insulating problems of the wiring terminal of the dry-type power electronic capacitor can be effectively solved by adopting the scheme, and the production efficiency is improved.
The utility model discloses simple structure, convenient assembling, sealed insulating properties is good, makes the long-term safe, reliable operation of condenser.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic view of the present invention mounted on a capacitor.
Fig. 2 is a schematic longitudinal sectional structure of the present invention.
Fig. 3 is a longitudinal sectional view of a portion a in fig. 2.
Fig. 4 shows a main view of the sealing insulator.
Fig. 5 is a top view of fig. 4.
Fig. 6 is a longitudinal sectional configuration view of fig. 4.
Fig. 7 is a longitudinal sectional configuration view of a portion B of fig. 6 enlarged.
Fig. 8 is a longitudinal sectional configuration view of a portion C of fig. 6 enlarged.
In the figure, 1-cabinet; 2-box cover; 3-a wiring terminal; 4-hearts; 5-a filled resin;
31-an insulator; 32-fixed round nuts; 33-cardboard washers; 34-a conductive rod; 35-a sealing insulator;
36-a first sealing ring; 37-second sealing ring.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
As can be seen in FIGS. 1-2:
fig. 1 shows the present invention installed on the top cover of the capacitor. Fig. 2 is a schematic diagram of the longitudinal section structure of the installation of the present invention.
The capacitor comprises a case shell (1), a case cover (2), a wiring terminal (3), a core (4) and filled resin (5). The wiring terminal (3) is mounted on the case cover (2) of the capacitor.
As can be seen in fig. 3: the sealing and insulating structure of the wiring terminal (3) is composed of an insulator (31), a fixed round nut (32), a paperboard gasket (33), a conductive rod (34), a sealing insulator (35), a first sealing ring (36) and a second sealing ring (37).
The conducting rod (34) penetrates through the middle through hole from the square hole at the bottom of the sealing insulator (35), and the second sealing ring (37) is sleeved in the cylindrical groove of the sealing insulator (35); the middle hexagonal part of the sealing insulator (35) is just arranged in the hexagonal square hole of the capacitor box cover (2); the first sealing ring (36) is sleeved on the upper part of the conducting rod (34) and slides to the top of the sealing insulator (35); the insulator (31) is sleeved on the upper part of the sealing insulator (35), and the upper part of the sealing insulator (35) is contacted with the convex groove at the bottom of the insulator (31); a cardboard washer (33) is placed in a groove at the top of the insulator (31); the fixed round nut (32) is arranged on the upper part of the conducting rod (34) and screwed, the first sealing ring (36) is tightly contacted with the upper part of the sealing insulator (35), the convex groove at the bottom of the insulator (31) and the conducting rod (34) by extrusion force, and meanwhile, the second sealing ring (37) is tightly combined with the contact part of the upper part of the sealing insulator (35) and the box cover (2) to play a role in sealing.
It can be seen from FIGS. 4-8: the sealing insulator (35) material is toughness nylon material, and the centre has the through-hole, and upper portion is cylindrical, and the centre has the hexagon of height 2.8mm, and the lower part is cylindrical, has cylindrical recess, and the terminal surface is lower 0.2mm than outer terminal surface in the recess, and there is circular recess the lower part, and the end has the dark square hole of 6 mm.
The square part at the bottom of the conducting rod (34) is tightly contacted with the square hole at the bottom of the sealing insulator (35), and the conducting rod (34) is firstly assembled
And coating sealant on the square part at the bottom.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (2)
1. The utility model provides a dry-type power electronic capacitor's binding post's sealed insulation system which characterized by: the sealing insulation structure consists of an insulator, a fixed round nut, a paperboard gasket, a conducting rod, a sealing insulator, a first sealing ring and a second sealing ring; the conducting rod penetrates through the middle through hole from the square hole at the bottom of the sealing insulator; the second sealing ring is sleeved in the cylindrical groove of the sealing insulator; the middle hexagonal part of the sealing insulator is just arranged in the hexagonal square hole of the capacitor box cover; the first sealing ring is sleeved on the upper part of the conducting rod and slides to the top of the sealing insulator; the insulator is sleeved on the upper part of the sealing insulator, and the upper part of the sealing insulator is contacted with the convex groove at the bottom of the insulator; a paperboard gasket is placed in a groove at the top of the insulator; the fixed round nut is arranged on the upper part of the conducting rod and screwed down, the extrusion force enables the first sealing ring to be in close contact with the upper part of the sealing insulator, the convex groove at the bottom of the insulator and the conducting rod, and meanwhile, the second sealing ring is also in close contact with the upper part of the sealing insulator and the contact part of the box cover, so that the sealing effect is achieved.
2. A sealing and insulating structure of a connection terminal of a dry type power electronic capacitor as claimed in claim 1, characterized in that: the sealing insulator is made of a tough nylon material, a through hole is formed in the middle of the sealing insulator, the upper portion of the sealing insulator is cylindrical, a hexagon with the height of 2.8mm is arranged in the middle of the sealing insulator, the lower portion of the sealing insulator is cylindrical and provided with a cylindrical groove, the inner end face of the groove is 0.2mm lower than the outer end face of the groove, and a square hole with the depth of 6mm is formed in the bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922112661.4U CN210778267U (en) | 2019-12-01 | 2019-12-01 | Sealing insulation structure of connecting terminal of dry power electronic capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922112661.4U CN210778267U (en) | 2019-12-01 | 2019-12-01 | Sealing insulation structure of connecting terminal of dry power electronic capacitor |
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| Publication Number | Publication Date |
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| CN210778267U true CN210778267U (en) | 2020-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922112661.4U Active CN210778267U (en) | 2019-12-01 | 2019-12-01 | Sealing insulation structure of connecting terminal of dry power electronic capacitor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110767452A (en) * | 2019-12-01 | 2020-02-07 | 无锡市电力滤波有限公司 | Sealing insulation structure of connecting terminal of dry power electronic capacitor |
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- 2019-12-01 CN CN201922112661.4U patent/CN210778267U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110767452A (en) * | 2019-12-01 | 2020-02-07 | 无锡市电力滤波有限公司 | Sealing insulation structure of connecting terminal of dry power electronic capacitor |
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