CN113991593B - Balanced pneumatic sleeve for power equipment and connecting method thereof - Google Patents

Abstract

The invention relates to a balanced air pressure type casing for electric power equipment and a connection method thereof. By arranging a hollow metal conductive piece and a sliding sealing block to cooperate, during the installation and connection process of a cable terminal accessory, when the outer cone surface of the casing and the cable terminal accessory When the inner wall reaches a critical value after contact and is further compressed, a sealed air chamber is formed between the casing and the cable terminal. The high air pressure in the air chamber acts on the sliding sealing block, causing the sliding sealing block to penetrate the structure along the hollow axial direction toward the power equipment. The air chamber inside the air box slides until the gas pressure in the two air chambers is balanced. The operator and installer can install the cable terminal and compress it in place using a small installation force, thereby improving the installation efficiency of the cable terminal accessories.

Description

A kind of balanced air pressure bushing for electric power equipment and its connection method

Technical field

The present invention relates to the technical field of electric equipment installation, and in particular to a balanced air pressure bushing for electric equipment and a connection method thereof.

Background technique

In the power equipment failure statistics, due to improper installation of cable terminals and accessories, the cable terminals and the incoming and outgoing line casings of the power equipment cannot be pressed tightly, which increases the probability of insulation, temperature rise and other failures at the incoming and outgoing line ends of the power equipment, directly causing the casing of the power equipment to Pipes burned or even lines blacked out. In order to improve the operational reliability of power equipment and the convenience of installation of cable terminal accessories, it is of great significance to research and design balanced air pressure bushings for power equipment.

The appearance schematic diagram of the cable terminal accessory (without pins) in the prior art is shown in Figure 1; the structural schematic diagram of the power equipment casing is shown in Figure 2; the structural schematic diagram of the cable terminal accessory and the power equipment casing after being pressed together As shown in Figure 3; the cable terminal accessories in Figure 1 are used together with the incoming and outgoing line casings of power equipment; the casings in Figure 2 are generally installed at the incoming and outgoing line ends of power equipment, and are isostatically sealed through sealing rings to achieve the sealing of the incoming and outgoing line ends of the equipment. Sealing; in Figure 3, the silicone rubber insulator 1 and the conductive pin 9 form a simple structure of the plug-in end of the cable terminal accessory, the conductive rod 3 and the insulator 6 form a simple structure of the inlet and outlet casing for power equipment, and the shell plate 5 is the power equipment The air box shell has a simple structure, and the conductive copper bar 7 is a simple structure for conductive connection inside the power equipment. After the cable terminal accessory is installed, since the silicone rubber insulating piece 1 and the insulating piece 6 are crimped and compressed to a certain extent, the cavity 2 and the cavity 8 form a sealed air chamber. There is a gap fit between the conductive rod 3 and the conductive pin 9, so the gas pressure inside the two air chambers is in a balanced state.

During the installation process of the cable terminal accessory, the installer needs to apply insulating lubricating silicone grease on the inside of the silicone rubber insulating piece 1, then insert it and crimp it to the outer insulation cone surface of the casing. When the crimping contact reaches the critical value, That is, when the gas in cavity 2 cannot escape from the air chamber, continued installation will cause the air pressure to rise, forming a force that hinders the operator from installing. At the same time, in order to ensure the insulation safety after mating, the inner cone diameter of the silicone rubber insulator 1 is smaller than the outer cone diameter of the casing insulator 6, further increasing the difficulty of installation. As the voltage level increases, the operator must The force used gradually increases and the installation becomes more difficult.

During the disassembly process of the cable terminal accessories, if the cable terminal accessories are in the plugged-in state for a long time, the amount of insulating lubricating silicone grease applied on the inside of the silicone rubber insulating piece 1 will be reduced, reducing its lubrication effect. From the beginning of disassembly until the crimping contact reaches the critical value, the gas pressure in cavity 2 and cavity 8 becomes smaller with the relative increase of space, which indirectly causes the internal outward ejection force to become smaller, which is not conducive to the disassembly of the cable terminal. .

Contents of the invention

Based on the above situation of the prior art, the purpose of the present invention is to provide a balanced pneumatic bushing for power equipment and a connection method thereof. By arranging a hollow metal conductive piece and a sliding sealing block, the cable terminal accessories and the bushing are improved. Efficiency during installation and removal.

In order to achieve the above object, according to one aspect of the present invention, a balanced pneumatic bushing for electric power equipment is provided, which includes a metal conductive piece, a sliding sealing block and a plurality of balancing holes;

The metal conductive part includes a columnar body with a hollow axial penetrating structure inside;

The plurality of balancing holes are arranged at the rear of the metal conductive member along the circumferential and/or radial direction;

The sliding sealing block is slidably disposed in the hollow axial penetrating structure of the metal conductive member.

Further, the sliding sealing block divides the hollow axial penetrating structure into two air chambers; wherein

The air chamber at one end is connected to the air outside the electrical equipment box, and the air chamber at the other end is connected to the air inside the electrical equipment box through a plurality of balancing holes.

Further, it also includes a plurality of seals arranged circumferentially along the sliding seal block;

The seal is used to slide the sliding sealing block into the hollow axial penetrating structure.

Further, it also includes an insulating member covering the outside of the metal conductive member;

The outer surface of the insulating member is divided into a front part, a middle part and a rear part along the axial direction. The front part is a tapered structure, and the middle part and the rear part are stepped structures that are raised in sequence.

Further, the rear part of the metal conductive part is also connected with a conductive copper bar and a conductive fixing part;

The conductive copper bars are used for conductive connections inside power equipment.

Further, it also includes a shell plate, which is a gas box shell of the electrical equipment.

According to another aspect of the present invention, a method for connecting a power equipment balancing pneumatic bushing and a cable terminal accessory is provided. The power equipment balancing pneumatic bushing includes the power equipment balance pneumatic bushing as described in any one of claims 1-6. casing;

The cable terminal accessories include hollow silicone rubber insulating parts and conductive pins;

The connection method includes the steps:

Insert the front part of the sleeve into the cavity of the cable terminal accessory, and the outer surface of the insulating member and the inner surface of the cavity of the cable terminal accessory are pressed against each other;

When the outer conical surface of the insulating member contacts the inner wall of the silicone rubber insulating member of the cable terminal attachment to a critical value and is further compressed, the front end of the casing, the bottom of the conductive pin, and the air chamber at one end of the sliding sealing block form a sealing air room;

The high air pressure in the sealed air chamber acts on the sliding sealing block, causing the sliding sealing block to slide along the hollow axial penetrating structure toward the air chamber inside the power equipment air box until the gas pressures in the two air chambers are balanced.

Further, the conductive pin is in an inverted T shape, the bottom of the inverted T is fixed to the hollow part of the silicone rubber insulator, and the top is used to insert the sleeve to achieve connection.

In summary, the present invention provides a balanced air pressure type bushing for power equipment and a connection method thereof. By arranging a hollow metal conductive piece and a sliding sealing block, during the installation and connection process of the cable terminal accessories, when the outside of the bushing is When the contact between the cone surface and the inner wall of the cable terminal accessory reaches a critical value and is further compressed, a sealed air chamber is formed between the casing and the cable terminal. The high air pressure in the air chamber acts on the sliding sealing block, causing the sliding sealing block to move along the hollow shaft. Sliding toward the through-structure and into the air chamber inside the power equipment air box until the gas pressures in the two air chambers are balanced, the operator and installer can install the cable terminal and compress it in place using a smaller installation force, thereby improving the installation efficiency of the cable terminal accessories.

Description of the drawings

Figure 1 is a schematic diagram of the appearance of a cable terminal accessory (without pins) in the prior art;

Figure 2 is a schematic structural diagram of a power equipment bushing in the prior art;

Figure 3 is a schematic structural diagram of the cable terminal accessory and the power equipment casing after being tightly fitted in the prior art;

Figure 4 is a schematic structural diagram of the cable terminal accessory and the balanced pneumatic bushing of the power equipment after being tightly fitted.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the specific embodiments and the accompanying drawings. It should be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention. Furthermore, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily confusing 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 present invention, a balanced pneumatic bushing for power equipment is provided. The bushing can be used for connection with cable terminal accessories. The bushing can be installed at the inlet and outlet of the power equipment and passed through a sealing ring, etc. Static sealing realizes the sealing of the equipment's inlet and outlet ends. Figure 4 shows a schematic structural diagram of the cable terminal accessory and the balanced pneumatic bushing of the power equipment in this embodiment after being tightly fitted. As shown in Figure 4, the bushing includes a metal conductive piece 3, a sliding sealing block 4 and multiple 8 balancing holes. The cable terminal accessories connected to the sleeve include a hollow silicone rubber insulator 1 and a conductive pin 13. As shown in Figure 4, the conductive pin 13 is in an inverted T shape, and the bottom of the inverted T shape is fixed to the silicone rubber insulation. The hollow part of piece 1, the top part is used to insert the sleeve to achieve connection. The metal conductive member 3 includes a columnar body with a hollow axial penetrating structure inside for guiding and end limiting; the plurality of balancing holes 8 are provided in the metal conductive member 3 along the circumferential and/or radial directions. The rear part; the sliding sealing block 4 is slidably disposed in the hollow axial penetrating structure of the metal conductive member 3. The sliding seal block 4 divides the hollow axial penetrating structure into two air chambers; among them, the air chamber at one end (such as the air chamber 11 in Figure 4) is connected to the air outside the power equipment box, and the air chamber at the other end ( For example, the air chamber 5 in Figure 4 is connected to the gas in the power equipment box through a plurality of balancing holes 8 . The sleeve also includes a plurality of seals 10 arranged along the circumference of the sliding seal block; the seals 10 are used to slide the sliding seal block 4 into the hollow axial penetrating structure; and are covered with the metal conductive parts 3. External insulating member 12; the outer surface of the insulating member 12 is divided into a front part, a middle part and a rear part along the axial direction. The front part is a tapered structure, and the middle part and the rear part are stepped steps that are raised in sequence. structure.

After the cable terminal accessory is installed, since the silicone rubber insulating piece 1 and the insulating piece 12 are crimped and compressed to a certain extent, the air chamber 2 and the air chamber 11 form a sealed air chamber. There is a clearance fit between the metal conductive piece 3 and the conductive pin 13, so the internal gas pressures of the air chamber 2 and the air chamber 11 are in a balanced state. The air chamber 5 forms a large sealed air chamber with the inside of the power equipment box through the balance hole 8 and the gap between the metal conductive part 3 and the conductive fixing part 7 .

The rear part of the metal conductive part 3 is also connected to a conductive copper bar 6 and a conductive fixing part 7; the conductive copper bar 6 is used for conductive connection inside the power equipment. Further, the bushing may also include a shell plate 9, which is a gas box shell of the electrical equipment.

According to another embodiment of the present invention, a method for connecting a power equipment balancing pneumatic bushing and a cable terminal accessory is provided. The power equipment balancing pneumatic bushing includes a method as described in the first embodiment of the invention. Casing; the connection method includes the following steps:

Insert the front part of the sleeve into the cavity of the cable terminal accessory, and the outer surface of the insulating member and the inner surface of the cavity of the cable terminal accessory are pressed against each other;

When the outer conical surface of the insulating member contacts the inner wall of the silicone rubber insulating member of the cable terminal attachment to a critical value and is further compressed, the front end of the casing, the bottom of the conductive pin, and the air chamber at one end of the sliding sealing block form a sealing air room;

The high air pressure in the sealed air chamber acts on the sliding sealing block, causing the sliding sealing block to slide along the hollow axial penetrating structure toward the air chamber inside the power equipment air box until the gas pressures in the two air chambers are balanced.

During the installation process of the cable terminal accessory, when the outer conical surface of the casing and the inner wall of the cable terminal accessory contact to a critical value and are further compressed, a sealed air chamber (air chamber 2 and air chamber 2) is formed between the casing and the cable terminal accessory. 11), the high air pressure in the air chamber acts on the sliding sealing block 4, causing the sliding sealing block 4 to slide along the hollow axial penetrating structure toward the air chamber inside the power equipment air box (air chamber 5 and the inside of the equipment shell) until the two air chambers The gas pressure is balanced, and the operator and installer can install the cable terminal accessories and compress them in place using a smaller installation force, which improves the installation efficiency of the cable terminal accessories.

During the dismantling process of the cable terminal accessories, the sliding sealing block 4 in the hollow axial penetration structure of the casing is used to keep the sealed air chamber between the casing and the cable terminal accessories and the air chamber of the power equipment box at the same pressure. When the outer wall of the casing and the inner wall of the cable terminal are in a compressed state and further separated, the air pressure in the air chamber in the power equipment air box acts on the sliding sealing block 4, causing the sliding sealing block 4 to penetrate the structure along the hollow axial direction toward the casing and cable terminal. The air chamber slides until the cable terminal is detached, and the operator and installer use small force to pull out and remove the cable terminal accessory.

To sum up, the present invention relates to a balanced air pressure type casing for power equipment and a connection method thereof. By arranging a hollow metal conductive piece and a sliding sealing block, during the installation and connection process of cable terminal accessories, when the outer cone of the casing When the surface contacts the inner wall of the cable terminal accessory and reaches a critical value and is further compressed, a sealed air chamber is formed between the casing and the cable terminal. The high air pressure in the air chamber acts on the sliding sealing block, causing the sliding sealing block to move along the hollow axis. The through-structure slides toward the air chamber inside the power equipment air box until the gas pressures in the two air chambers are balanced. The operator and installer can install the cable terminal and compress it in place using a small installation force, thereby improving the installation efficiency of the cable terminal accessories.

It should be understood that the above-described specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention shall be included in the protection scope of the present invention. Furthermore, it is intended that the appended claims of the present invention cover all changes and modifications that fall within the scope and boundaries of the appended claims, or equivalents of such scopes and boundaries.

Claims (2)

1. A method for connecting a balanced pneumatic sleeve of an electric power device with a cable terminal accessory is characterized in that,

the power equipment balance pneumatic sleeve comprises a metal conductive piece, a sliding sealing block and a plurality of balance holes;

the metal conductive piece comprises a columnar body with a hollow axial penetrating structure inside;

the balance holes are circumferentially and/or radially arranged at the rear part of the metal conductive piece;

the sliding sealing block is slidably arranged in the hollow axial penetrating structure of the metal conductive piece;

the cable terminal accessory comprises a hollow silicon rubber insulator and a conductive pin;

the connection method comprises the following steps:

inserting the cable terminal accessory into the front end of the sleeve, and mutually crimping the outer surface of the insulating part and the inner surface of the cavity of the cable terminal accessory;

when the outer conical surface of the insulating part contacts with the inner wall of the silicon rubber insulating part of the cable terminal accessory and then is subjected to critical value and further compression, the front end of the sleeve forms a sealed air chamber with the bottom of the conductive contact pin and the air chamber at one end of the sliding sealing block;

the high air pressure in the sealed air chamber acts on the sliding sealing block, so that the sliding sealing block slides along the hollow axial penetrating structure to the air chamber inside the air box of the power equipment until the air pressure of the two air chambers is balanced.

2. The method of claim 1, wherein the conductive pins are inverted T-shaped with the bottom of the inverted T-shape being secured to the hollow portion of the silicone insulator and the top for insertion into the sleeve to effect the connection.