CN113991593A - Balanced air pressure type sleeve of power equipment and connecting method thereof - Google Patents
Balanced air pressure type sleeve of power equipment and connecting method thereof Download PDFInfo
- Publication number
- CN113991593A CN113991593A CN202111183781.9A CN202111183781A CN113991593A CN 113991593 A CN113991593 A CN 113991593A CN 202111183781 A CN202111183781 A CN 202111183781A CN 113991593 A CN113991593 A CN 113991593A
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- Prior art keywords
- cable terminal
- air
- power equipment
- sleeve
- terminal accessory
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/02—Cable terminations
- H02G15/06—Cable terminating boxes, frames or other structures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
- H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
- H02B13/025—Safety arrangements, e.g. in case of excessive pressure or fire due to electrical defect
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Cable Accessories (AREA)
Abstract
The invention relates to a balanced air pressure type sleeve of power equipment and a connecting method thereof.A hollow metal conductive piece is matched with a sliding sealing block, a sealing air chamber is formed between the sleeve and a cable terminal when the outer conical surface of the sleeve is contacted with the inner wall of the cable terminal accessory and then reaches a critical value and is further compressed in the installation and connection process of the cable terminal accessory, high air pressure in the air chamber acts on the sliding sealing block, so that the sliding sealing block slides towards an air chamber in an air box of the power equipment along a hollow axial penetrating structure until the air pressure of the two air chambers is balanced, and an operator can install and compress the cable terminal in place by using smaller installation force, thereby improving the installation efficiency of the cable terminal accessory.
Description
Technical Field
The invention relates to the technical field of power equipment installation, in particular to a balanced air pressure type sleeve of power equipment and a connecting method thereof.
Background
In the power equipment fault statistics, because of improper installation of the cable terminal and the accessories, the cable terminal and the power equipment inlet and outlet wire sleeve cannot be tightly pressed, the occurrence probability of faults of insulation, temperature rise and the like of the power equipment inlet and outlet wire end is improved, and the power equipment sleeve is directly burnt or even the line is powered off. In order to improve the operation reliability of the power equipment and the installation convenience of the cable terminal accessories, it is of great significance to research and design the balance air pressure type sleeve for the power equipment.
A schematic external view of a prior art cable termination accessory (without a pin) is shown in fig. 1; the structure schematic diagram of the power equipment sleeve is shown in FIG. 2; a schematic structural diagram of the cable termination accessory after being in press fit with the electrical equipment casing is shown in fig. 3; in fig. 1, the cable termination accessory is used with an in-out sleeve of an electrical device; in fig. 2, the bushing is generally installed at the inlet and outlet terminals of the power equipment, and the inlet and outlet terminals of the equipment are sealed by static seals such as sealing rings; in fig. 3, the silicone rubber insulating member 1 and the conductive contact pin 9 form a simple structure of a plug terminal of a cable terminal accessory, the conductive rod 3 and the insulating member 6 form a simple structure of a wire inlet and outlet sleeve for power equipment, the outer shell plate 5 is a simple structure of an air box shell of the power equipment, and the conductive copper bar 7 is a simple structure of conductive connection inside the power equipment. After the cable terminal accessory is installed, the silicon rubber insulating part 1 and the insulating part 6 are in compression joint and have a certain compression amount, so that the cavity 2 and the cavity 8 form a sealed air chamber. The conductive rod 3 and the conductive pin 9 are in clearance fit, so that the gas pressure inside the two gas chambers is in a balanced state.
During installation of the cable terminal accessory, an installer needs to paint insulating lubricating silicone grease on the inner side of the silicone rubber insulating part 1 and then sleeve the silicone rubber insulating part and press the silicone rubber insulating part onto an insulating conical surface outside the sleeve, and when the pressure welding contacts a critical value, namely the air in the cavity 2 cannot escape from the air chamber, continuous installation can lead to air pressure rise, and a force for preventing an operator from installing the cable terminal accessory is formed. Simultaneously, in order to ensure the insulation safety after matching, the diameter of the inner conical surface of the silicon rubber insulating part 1 is smaller than that of the outer conical surface of the sleeve insulating part 6, the installation difficulty is further increased, along with the improvement of the voltage grade, the strength of an operator in the installation process is gradually increased, and the installation difficulty is increased.
When the cable terminal accessory is detached and is in a plug-in state for a long time, the amount of the insulating lubricating silicone grease smeared on the inner side of the silicone rubber insulating part 1 is reduced, and the lubricating effect of the silicone rubber insulating part is reduced. When the pressure contact is contacted with a critical value from the beginning of the disassembly, the gas pressure in the cavity 2 and the cavity 8 is reduced along with the relative increase of the space, so that the ejection force from the inside to the outside is reduced indirectly, and the disassembly of the cable terminal is not facilitated.
Disclosure of Invention
Based on the above situation in the prior art, an object of the present invention is to provide a balanced pneumatic bushing for electrical equipment and a connection method thereof, which improves the efficiency of the cable terminal accessory and the bushing in the installation and removal processes by providing a hollow metal conductive member to cooperate with a sliding sealing block.
In order to achieve the above object, according to one aspect of the present invention, there is provided a balanced pneumatic bushing for an electrical device, including a metal conductive member, a sliding sealing block, and a plurality of balance holes;
the metal conductive piece comprises a cylindrical body with a hollow axial penetrating structure inside;
the balance holes are arranged at the rear part of the metal conductive piece along the circumferential direction and/or the radial direction;
the sliding sealing block can be slidably arranged in the hollow axial penetrating structure of the metal conductive piece.
Further, the sliding sealing block divides the hollow axial penetrating structure into two air chambers; wherein
The air chamber of one end is communicated with the air outside the power equipment box body, and the air chamber of the other end is communicated with the air inside the power equipment box body through a plurality of balance holes.
Further, the sliding seal further comprises a plurality of sealing elements arranged along the circumferential direction of the sliding seal block;
the seal is used to slidably seal the sliding seal block into the hollow axially penetrating structure.
Further, the metal conductive piece comprises an insulating piece coated outside the metal conductive piece;
the outer surface of the insulating part is axially divided into a front part, a middle part and a rear part, the front part is of a conical structure, and the middle part and the rear part are of stepped structures which are sequentially lifted.
Furthermore, the rear part of the metal conductive piece is also connected with a conductive copper bar and a conductive fixing piece;
the conductive copper bar is used for conductive connection inside the power equipment.
Further, the air box comprises an outer shell plate, and the outer shell plate is an air box shell of the power equipment.
According to another aspect of the present invention, there is provided a method for connecting a balanced gas pressure type sleeve of an electric power equipment to a cable terminal accessory, the balanced gas pressure type sleeve of the electric power equipment comprises the sleeve according to any one of claims 1 to 6;
the cable terminal accessory comprises a hollow silicon rubber insulating part and a conductive contact pin;
the connection method includes the steps of:
inserting the front part of the sleeve into a cavity of the cable terminal accessory, and mutually crimping the outer surface of the insulating part of the sleeve and the inner surface of the cavity of the cable terminal accessory;
when the outer conical surface of the insulating part is contacted with the inner wall of the silicon rubber insulating part of the cable terminal accessory and then reaches a critical value and is further compressed, the front end of the sleeve, the bottom of the conductive contact pin and the air chambers at one end of the sliding sealing block form sealed air chambers;
high air pressure in the sealed air chamber acts on the sliding sealing block, so that the sliding sealing block slides towards the air chamber in the power equipment air box along the hollow axial penetrating structure until the air pressure of the two air chambers is balanced.
Furthermore, the conductive contact pin is in an inverted T shape, the bottom of the inverted T shape is fixed to the hollow part of the silicon rubber insulating part, and the top of the inverted T shape is used for inserting the sleeve to realize connection.
In summary, the invention provides a balanced air pressure type sleeve for electric power equipment and a connecting method thereof, wherein a hollow metal conductive piece is arranged to be matched with a sliding sealing block, in the process of installing and connecting a cable terminal accessory, when the outer conical surface of the sleeve is contacted with the inner wall of the cable terminal accessory and then reaches a critical value and is further compressed, a sealing air chamber is formed between the sleeve and the cable terminal, high air pressure in the air chamber acts on the sliding sealing block, so that the sliding sealing block slides towards an air chamber in an air box of the electric power equipment along a hollow axial penetrating structure until the air pressure of the two air chambers is balanced, and an operator can install and compress the cable terminal in place by using smaller installing force, thereby improving the installing efficiency of the cable terminal accessory.
Drawings
FIG. 1 is a schematic external view of a prior art cable termination accessory (without a pin);
FIG. 2 is a schematic diagram of a prior art electrical equipment bushing;
FIG. 3 is a schematic view of a prior art cable termination fitting in compression fit with a power equipment sleeve;
fig. 4 is a schematic structural view of the cable termination fitting in compression fit with the balanced pneumatic sleeve of the electrical equipment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings. According to one embodiment of the invention, a balanced pneumatic sleeve for electrical equipment is provided, which can be used for connecting with a cable terminal accessory, can be installed at an inlet/outlet wire end of the electrical equipment, and realizes the sealing of the inlet/outlet wire end of the equipment through static sealing such as a sealing ring. Fig. 4 shows a schematic structural diagram of the cable termination accessory after being press-fitted into the balanced pneumatic sleeve of the power equipment in this embodiment, as shown in fig. 4, the sleeve includes a metal conductive member 3, a sliding sealing block 4 and a plurality of balancing holes 8. The cable terminal accessory which is matched and connected with the sleeve comprises a hollow silicon rubber insulating part 1 and a conductive contact pin 13, as shown in fig. 4, the conductive contact pin 13 is in an inverted T shape, the bottom of the inverted T shape is fixed at the hollow part of the silicon rubber insulating part 1, and the top of the inverted T shape is used for inserting the sleeve to realize connection. The metal conductive piece 3 comprises a cylindrical body with a hollow axial penetrating structure inside, so as to realize guiding and end limiting; the balance holes 8 are arranged at the rear part of the metal conductive piece 3 along the circumferential direction and/or the radial direction; the sliding seal block 4 is slidably disposed in the hollow axial through structure of the metal conductive member 3. The sliding sealing block 4 divides the hollow axial penetrating structure into two air chambers; wherein, the air chamber (for example, the air chamber 11 in fig. 4) at one end is in air communication with the outside of the electrical equipment box, and the air chamber (for example, the air chamber 5 in fig. 4) at the other end is in air communication with the inside of the electrical equipment box through a plurality of balance holes 8. The sleeve further comprises a plurality of seals 10 arranged circumferentially along the sliding seal block; the seal 10 is used for sliding sealing the sliding seal block 4 into the hollow axial through structure; and an insulating member 12 coated outside the conductive metal member 3; the outer surface of the insulating part 12 is axially divided into a front part, a middle part and a rear part, the front part is of a conical structure, and the middle part and the rear part are of stepped structures which are sequentially lifted.
After the cable terminal accessory is installed, the silicone rubber insulating part 1 and the insulating part 12 are in compression joint and have a certain compression amount, so that the air chamber 2 and the air chamber 11 form a sealed air chamber. There is a clearance fit between metal conductor 3 and conductive pin 13 so that the internal gas pressure of gas chamber 2 and gas chamber 11 is in equilibrium. The air chamber 5 forms a large sealed air chamber with the interior of the electrical equipment box through the balance hole 8 and the gap between the metal conductive piece 3 and the conductive fixing piece 7.
The rear part of the metal conductive piece 3 is also connected with a conductive copper bar 6 and a conductive fixing piece 7; the conductive copper bar 6 is used for conductive connection inside the power equipment. Further, the bushing may further comprise an outer skin 9, said outer skin 9 being a gas box housing of the electrical device.
According to another embodiment of the present invention, there is provided a method for connecting a balanced pneumatic sleeve of an electrical device to a cable termination accessory, the balanced pneumatic sleeve of the electrical device comprising the sleeve according to the first embodiment of the present invention; the connection method comprises the following steps:
inserting the front part of the sleeve into a cavity of the cable terminal accessory, and mutually crimping the outer surface of the insulating part of the sleeve and the inner surface of the cavity of the cable terminal accessory;
when the outer conical surface of the insulating part is contacted with the inner wall of the silicon rubber insulating part of the cable terminal accessory and then reaches a critical value and is further compressed, the front end of the sleeve, the bottom of the conductive contact pin and the air chambers at one end of the sliding sealing block form sealed air chambers;
high air pressure in the sealed air chamber acts on the sliding sealing block, so that the sliding sealing block slides towards the air chamber in the power equipment air box along the hollow axial penetrating structure until the air pressure of the two air chambers is balanced.
In the installation process of the cable terminal accessory, when the outer conical surface of the sleeve is contacted with the inner wall of the cable terminal accessory and then reaches a critical value and is further compressed, a sealing air chamber (an air chamber 2 and an air chamber 11) is formed between the sleeve and the cable terminal accessory, high air pressure in the air chamber acts on the sliding sealing block 4, the sliding sealing block 4 slides towards an air chamber (an air chamber 5 and the inside of an equipment shell) in an air box of the power equipment along a hollow axial through structure until the air pressure of the two air chambers is balanced, an operation installer can install the cable terminal accessory and compress the cable terminal accessory in place by using small installation force, and the installation efficiency of the cable terminal accessory is improved.
In the process of dismantling the cable terminal accessory, the sliding sealing block 4 in the hollow axial penetrating structure of the sleeve pipe enables a sealing air chamber between the sleeve pipe and the cable terminal accessory and an air chamber of a box body of the power equipment to be always under the same pressure. When the outer wall of the sleeve and the inner wall of the cable terminal are in a compressed state and further separated, air pressure in an air chamber in an air box of the power equipment acts on the sliding sealing block 4, so that the sliding sealing block 4 slides to the air chamber between the sleeve and the cable terminal along the hollow axial penetrating structure until the cable terminal is separated, and an operation installer pulls out the cable terminal accessory with small force to dismantle the cable terminal accessory.
In summary, the invention relates to a balanced air pressure type sleeve for electric power equipment and a connecting method thereof, a hollow metal conductive piece is arranged to be matched with a sliding sealing block, in the process of installing and connecting a cable terminal accessory, when the outer conical surface of the sleeve is contacted with the inner wall of the cable terminal accessory and then reaches a critical value and is further compressed, a sealing air chamber is formed between the sleeve and the cable terminal, high air pressure in the air chamber acts on the sliding sealing block, so that the sliding sealing block slides towards an air chamber in an air box of the electric power equipment along a hollow axial penetrating structure until the air pressure of the two air chambers is balanced, and an operator can install and compress the cable terminal in place by using smaller installing force, thereby improving the installing efficiency of the cable terminal accessory.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (8)
1. A balanced air pressure type sleeve for electric power equipment is characterized by comprising a metal conductive piece, a sliding sealing block and a plurality of balance holes;
the metal conductive piece comprises a cylindrical body with a hollow axial penetrating structure inside;
the balance holes are arranged at the rear part of the metal conductive piece along the circumferential direction and/or the radial direction;
the sliding sealing block can be slidably arranged in the hollow axial penetrating structure of the metal conductive piece.
2. The cannula according to claim 1, wherein said sliding seal block divides the hollow axially penetrating structure into two air chambers; the air chamber at one end is communicated with the air outside the power equipment box body, and the air chamber at the other end is communicated with the air inside the power equipment box body through a plurality of balance holes.
3. The cannula according to claim 2, further comprising a plurality of seals disposed circumferentially along the sliding seal block; the seal is used to slidably seal the sliding seal block into the hollow axially penetrating structure.
4. A bushing as claimed in claim 3, further comprising an insulator member coated outside the metallic conductive member;
the outer surface of the insulating part is axially divided into a front part, a middle part and a rear part, the front part is of a conical structure, and the middle part and the rear part are of stepped structures which are sequentially lifted.
5. The bushing of claim 4, wherein the rear portion of the metal conductive member is further connected with a conductive copper bar and a conductive fixing member;
the conductive copper bar is used for conductive connection inside the power equipment.
6. The bushing of claim 5 further comprising an outer skin plate, the outer skin plate being a gas box housing of an electrical device.
7. A method for connecting a balanced air pressure type sleeve of electric power equipment with a cable terminal accessory is characterized in that,
the electric power equipment balance gas pressure type sleeve comprises the sleeve according to any one of claims 1-6;
the cable terminal accessory comprises a hollow silicon rubber insulating part and a conductive contact pin;
the connection method includes the steps of:
inserting the cable terminal accessory into the front end of the sleeve, and mutually crimping the outer surface of the insulating part of the cable terminal accessory with the inner surface of the cavity of the cable terminal accessory;
when the outer conical surface of the insulating part is contacted with the inner wall of the silicon rubber insulating part of the cable terminal accessory and then reaches a critical value and is further compressed, the front end of the sleeve, the bottom of the conductive contact pin and the air chambers at one end of the sliding sealing block form sealed air chambers;
high air pressure in the sealed air chamber acts on the sliding sealing block, so that the sliding sealing block slides towards the air chamber in the power equipment air box along the hollow axial penetrating structure until the air pressure of the two air chambers is balanced.
8. The method of claim 7, wherein the conductive pin is in the shape of an inverted T, the bottom of which is fixed to the hollow portion of the silicone rubber insulator and the top of which is used to insert the bushing to make the connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111183781.9A CN113991593B (en) | 2021-10-11 | 2021-10-11 | Balanced pneumatic sleeve for power equipment and connecting method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111183781.9A CN113991593B (en) | 2021-10-11 | 2021-10-11 | Balanced pneumatic sleeve for power equipment and connecting method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113991593A true CN113991593A (en) | 2022-01-28 |
| CN113991593B CN113991593B (en) | 2023-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111183781.9A Active CN113991593B (en) | 2021-10-11 | 2021-10-11 | Balanced pneumatic sleeve for power equipment and connecting method thereof |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020164896A1 (en) * | 1997-07-30 | 2002-11-07 | Thomas & Betts International, Inc. | Loadbreak connector assembly which prevents switching flashover |
| US7156135B1 (en) * | 2006-02-01 | 2007-01-02 | Sunworld Industrial Co., Ltd. | Quick-release connector structure for an air tank |
| CN202084783U (en) * | 2011-06-03 | 2011-12-21 | 江苏迪康电气有限公司 | Cable port assembly of gas-insulated cabinet |
| GB201217788D0 (en) * | 2012-10-04 | 2012-11-14 | Tronic Ltd | Downhole cable termination systems |
| CN105375379A (en) * | 2015-12-01 | 2016-03-02 | 许继集团有限公司 | Gas insulation switch cabinet and plug-in wiring sleeve assembly thereof |
| CN105826748A (en) * | 2016-03-18 | 2016-08-03 | 北京卫星环境工程研究所 | Vacuum high-voltage insulation structure for vacuum environment simulator power supply or cable transferring test |
| CN210396693U (en) * | 2019-09-16 | 2020-04-24 | 长江大学 | Bidirectional pressure relief nipple for underground casing annulus |
| CN112615341A (en) * | 2020-12-30 | 2021-04-06 | 黄春婧 | Power cable sealing device |
-
2021
- 2021-10-11 CN CN202111183781.9A patent/CN113991593B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020164896A1 (en) * | 1997-07-30 | 2002-11-07 | Thomas & Betts International, Inc. | Loadbreak connector assembly which prevents switching flashover |
| US7156135B1 (en) * | 2006-02-01 | 2007-01-02 | Sunworld Industrial Co., Ltd. | Quick-release connector structure for an air tank |
| CN202084783U (en) * | 2011-06-03 | 2011-12-21 | 江苏迪康电气有限公司 | Cable port assembly of gas-insulated cabinet |
| GB201217788D0 (en) * | 2012-10-04 | 2012-11-14 | Tronic Ltd | Downhole cable termination systems |
| CN105375379A (en) * | 2015-12-01 | 2016-03-02 | 许继集团有限公司 | Gas insulation switch cabinet and plug-in wiring sleeve assembly thereof |
| CN105826748A (en) * | 2016-03-18 | 2016-08-03 | 北京卫星环境工程研究所 | Vacuum high-voltage insulation structure for vacuum environment simulator power supply or cable transferring test |
| CN210396693U (en) * | 2019-09-16 | 2020-04-24 | 长江大学 | Bidirectional pressure relief nipple for underground casing annulus |
| CN112615341A (en) * | 2020-12-30 | 2021-04-06 | 黄春婧 | Power cable sealing device |
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| Publication number | Publication date |
|---|---|
| CN113991593B (en) | 2023-09-08 |
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