CN120414334A - A switch cabinet using clean air as insulating medium - Google Patents
A switch cabinet using clean air as insulating mediumInfo
- Publication number
- CN120414334A CN120414334A CN202510921442.8A CN202510921442A CN120414334A CN 120414334 A CN120414334 A CN 120414334A CN 202510921442 A CN202510921442 A CN 202510921442A CN 120414334 A CN120414334 A CN 120414334A
- Authority
- CN
- China
- Prior art keywords
- air
- sleeve
- sealing
- fixed
- switch cabinet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
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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
- H02B13/035—Gas-insulated switchgear
- H02B13/045—Details of casing, e.g. gas tightness
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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
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/20—Bus-bar or other wiring layouts, e.g. in cubicles, in switchyards
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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
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/30—Cabinet-type casings; Parts thereof or accessories therefor
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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
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/30—Cabinet-type casings; Parts thereof or accessories therefor
- H02B1/32—Mounting of devices therein
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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
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/56—Cooling; Ventilation
- H02B1/565—Cooling; Ventilation for cabinets
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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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
- Pressure Vessels And Lids Thereof (AREA)
Abstract
本发明公开了一种以洁净空气为绝缘介质的开关柜，具体涉及电力设备技术领域，该以洁净空气为绝缘介质的开关柜，包括柜体、气箱、固定盘、密封隔套、柱形套、夹持套、密封圈；收缩单元；补气单元，设于气箱内，且用于在夹持套收缩时，往气箱内部补充气体。本发明中，收缩单元将触发，并驱动夹持套产生弹性收缩的形变，进而使得穿缆孔的孔壁夹紧密封圈，使得密封圈与电缆的表面接触更紧密，减少电缆与电缆孔的泄漏现象，另外气箱内的气压下降时，补气单元动作，进而能够往气箱内补充气体，增加气箱内的气压，进而在短时间内维持气箱内的正压状态，提高气箱内绝缘气体介质的浓度，以防止对气箱的灭弧产生较大影响。
The present invention discloses a switch cabinet using clean air as an insulating medium, specifically relating to the technical field of power equipment. The switch cabinet using clean air as an insulating medium comprises a cabinet body, an air box, a fixed plate, a sealing spacer, a cylindrical sleeve, a clamping sleeve, a sealing ring; a contraction unit; and an air supply unit, which is arranged in the air box and is used to supply gas to the interior of the air box when the clamping sleeve contracts. In the present invention, the contraction unit will be triggered and drive the clamping sleeve to produce elastic contraction deformation, thereby clamping the sealing ring on the wall of the cable hole, so that the sealing ring and the surface of the cable are in closer contact, reducing leakage between the cable and the cable hole. In addition, when the air pressure in the air box drops, the air supply unit will be activated, thereby replenishing gas into the air box, increasing the air pressure in the air box, and maintaining a positive pressure state in the air box for a short time, thereby increasing the concentration of the insulating gas medium in the air box, and preventing a significant impact on the arc extinguishing of the air box.
Description
Technical Field
The invention belongs to the technical field of power equipment, and particularly relates to a switch cabinet with clean air as an insulating medium.
Background
The switch cabinet is an electrical device, the external line of the switch cabinet firstly enters the main control switch in the cabinet, then enters the sub-control switch, and each shunt is arranged according to the requirement. Such as meters, automatic control, motor magnetic switches, various ac contactors, etc., and high-voltage and low-voltage switchgear, high-voltage buses, such as power plants, etc., and low-cycle relief for protecting major equipment. The main function of the switch cabinet is to open and close, control and protect electric equipment in the process of generating, transmitting, distributing and converting electric energy of the electric power system. The components in the switch cabinet mainly comprise a breaker, a disconnecting switch, a load switch, an operating mechanism, a transformer, various protection devices and the like. The switch cabinets can be classified into a movable switch cabinet and a fixed switch cabinet in a breaker installation mode, or can be classified into an open switch cabinet, a metal closed switch cabinet and a metal closed armoured switch cabinet according to the difference of cabinet structures, and can be classified into a high-voltage switch cabinet, a medium-voltage switch cabinet, a low-voltage switch cabinet and the like according to different voltage grades. The method is mainly suitable for various different occasions such as power plants, transformer substations, petrochemical industry, metallurgical steel rolling, light industry textile, factories and mining enterprises, residential communities, high-rise buildings and the like.
Through searching, a switch cabinet is disclosed in Chinese patent publication No. CN206533038U, which can avoid overvoltage damage of a voltage transformer caused by three-phase unbalance due to voltage instability. The switch cabinet comprises a switch cabinet frame, an air box and a cable chamber, wherein the air box and the cable chamber are positioned in the switch cabinet frame, and the air box is positioned above the cable chamber. The switch cabinet further comprises a transformer chamber arranged on the back of the switch cabinet frame, the transformer chamber comprises a mounting frame, a three-phase voltage transformer, a cable and a shell, the mounting frame is mounted on the switch cabinet frame, the three-phase voltage transformer is arranged on the mounting frame, one end of the cable is connected with the voltage transformer, the other end of the cable is connected into the cable chamber, and the shell is fixed on the mounting frame and covers the transformer chamber, wherein the voltage transformer adopts a triangle connection method.
In the above technical scheme, the electrical equipment installed in the gas tank is mainly connected with other electrical equipment in the switch cabinet through the cable, but because the cable penetrates through the gas tank shell, the inside of the gas tank is in a positive pressure state under the general condition, namely, the gas pressure in the gas tank is higher than normal pressure, so that the problem of gas leakage at the joint of the cable and the gas tank is likely to occur, and further, the gas concentration in the gas tank is reduced, for example, the effect of arc extinction is likely to be affected when the SF6 gas concentration is reduced, so that the switch cabinet capable of timely reducing the leakage amount when the gas leakage condition occurs is necessarily designed.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide the switch cabinet with clean air as an insulating medium.
The technical scheme adopted for solving the technical problems is that the switch cabinet using clean air as an insulating medium comprises a cabinet body of the switch cabinet and an air box arranged in the cabinet body, wherein a plurality of cable through holes are formed in an air box shell, and the switch cabinet further comprises:
the fixed disc is arranged on the air box shell, the end face of the fixed disc is fixedly connected with a sealing spacer inserted into the cable through hole, and the sealing spacer is provided with a cable hole;
The cylindrical sleeve is coaxially fixedly connected to one end of the sealing spacer sleeve penetrating into the gas tank, one end of the cylindrical sleeve, which is far away from the sealing spacer sleeve, is coaxially fixedly connected with the clamping sleeve, a cable penetrating hole penetrating through the cylindrical sleeve is formed in the clamping sleeve, a plurality of deformation joints communicated with the cable penetrating hole are formed in the periphery of the clamping sleeve, a sealing ring mounting groove is coaxially formed in the clamping sleeve, and a sealing ring is mounted in the sealing ring mounting groove;
the contraction unit is arranged on the sealing spacer bush and is used for driving the clamping bush to contract when the pressure in the air box is lost;
and the air supplementing unit is arranged in the air box and is used for supplementing air into the air box when the clamping sleeve contracts.
Through the technical scheme, a sealing state is formed between the cable hole and the outer wall of the cable, when the gas pressure in the gas tank is reduced, the shrinkage unit is triggered and drives the clamping sleeve to elastically shrink and deform, so that the hole wall of the cable hole clamps the sealing ring, the sealing ring is tightly contacted with the surface of the cable, the deformation joint is also in a closed state, the leakage phenomenon of the cable and the cable hole is reduced, in addition, when the gas pressure in the gas tank is reduced, the gas supplementing unit acts, and then the gas can be supplemented into the gas tank, the gas pressure in the gas tank is increased, the positive pressure state in the gas tank is maintained in a short time, the concentration of an insulating gas medium in the gas tank is improved, so that the arc extinction of the gas tank is prevented from being greatly influenced, in addition, sufficient time is given to operation and maintenance personnel on site, in addition, the clamping force of the clamping sleeve to the sealing ring is small, the sealing ring is prevented from being deformed due to long-term clamping of the cable, and the sealing effect of the sealing ring on the cable is prevented.
Further, shrink the unit including sliding ground suit in the peripheral sealed sliding sleeve of cylindricality cover, sealed sliding sleeve keeps away from the coaxial rigid coupling of one end of sealed spacer has the extrusion cover, the clamping sleeve external diameter increases gradually in proper order towards the direction of keeping away from sealed spacer, the coaxial awl groove of having seted up with clamping sleeve complex of extrusion cover, annular intercommunication chamber has been seted up to the coaxial in the sealed spacer, be equipped with pneumatic component in the intercommunication chamber, pneumatic component is used for driving the extrusion cover and removes towards the direction of keeping away from sealed spacer, makes awl inslot wall produces the extrusion force to the clamping sleeve outer wall.
Through the technical scheme, the sealing sliding sleeve slides towards the clamping sleeve on the periphery of the sealing spacer sleeve, so that the inner wall of the conical groove on the extrusion sleeve generates extrusion force to the clamping sleeve, the clamping sleeve generates elastic shrinkage deformation along the radial inner side of the clamping sleeve, a cable penetrating hole of the clamping sleeve is further reduced, clamping force is generated to the sealing ring, the sealing ring can clamp a cable, and the contact surface between the cable and the sealing ring is more compact.
Further, the pneumatic assembly comprises a sliding plug coaxially and slidingly clamped in the communicating cavity, the communicating cavity is divided into two cavities which are not communicated with each other by the sliding plug, the two cavities are sequentially defined into a first cavity and a second cavity towards the direction away from the fixed disc, the wall surface of the sealing spacer is provided with an air vent communicated with the second cavity, the end surface of the sliding plug is fixedly connected with a plurality of push rods, one end of each push rod penetrating out of the sealing spacer is fixedly connected with the end surface of the extrusion sleeve, a spacer ring is fixedly arranged at the mouth of the second cavity, and a sliding hole for the push rods to freely pass through is formed in the end surface of the spacer ring.
Through the technical scheme, gas in the gas tank enters the second cavity through the air holes and generates thrust to the sliding plug, so that the sliding plug overcomes the air pressure resistance in the first cavity and moves until reaching an equilibrium state, when the air pressure in the gas tank is reduced, the air pressure in the first cavity is greater than the air pressure in the second cavity, and then the sliding plug is enabled to move in the direction away from the fixed disc, the sliding plug drives the push rod to move, the push rod synchronously drives the extrusion sleeve to move, the inner wall of the conical groove on the extrusion sleeve relatively slides to the outer wall of the clamping sleeve, and extrusion force is generated on the periphery of the extrusion sleeve.
Further, a spring is arranged in the first cavity, the spring elastically abuts against the end face of the sliding plug, and potential energy is given to the sliding plug to move in the direction away from the fixed disc.
Through above-mentioned technical scheme, set up the spring, the spring has elasticity to the slip stopper and supports the power for when the atmospheric pressure in the gas tank descends, the slip stopper can in time produce and remove, and makes extrusion cover and centre gripping cover produce relative slip.
Further, one end of the clamping sleeve, which is far away from the cylindrical sleeve, is fixedly connected with a flange which is turned inwards, and the flange is used for limiting the movement of the sealing ring.
Through above-mentioned technical scheme, the flange produces spacing effect to the sealing washer towards the direction motion of keeping away from the fixed disk, and then can prevent that the sealing washer from breaking away from out from the cable hole, and influence the sealing effect of sealing washer to the cable.
Further, the air supplementing unit comprises an air storage tank arranged in the air box, the air storage tank is located above the sealing spacer, an air outlet seat is arranged on the wall surface of the air storage tank, an inner cavity of the air outlet seat is communicated with an inner cavity of the air storage tank, a communication assembly is arranged in the air outlet seat, and the communication assembly is used for enabling an opening of the air outlet seat to be opened when the sealing sliding sleeve moves in a direction away from the sealing spacer.
Through the technical scheme, when the air pressure in the air box is reduced, the sliding plug moves, the sealing sliding sleeve moves, and when the sealing sliding sleeve moves, the communication component is triggered to act, so that the inner cavity of the air outlet seat and the air box are in a communication state, and therefore insulating medium gas in the air storage tank enters the air box from the air outlet seat, the gas in the air box is further supplemented, the gas concentration is improved, and the phenomenon that arc extinction is influenced due to the fact that the gas concentration in the air box is reduced due to the reduction of the air pressure is reduced.
Further, the communication assembly comprises a fixed plug coaxially and fixedly arranged in the inner cavity of the air outlet seat, a plurality of first communication ports are formed in the end face of the fixed plug, a sealing piston is coaxially and slidingly arranged in the inner cavity of the air outlet seat, a second communication port which is staggered with the first communication ports is formed in the end face of the sealing piston, the sealing piston is located above the fixed plug, the propped faces of the sealing piston and the end face propped against each other are in a sealing state, and a driving structure for driving the sealing piston to move towards the fixed plug is arranged on the sealing sliding sleeve.
Through the technical scheme, when the sealing sliding sleeve moves towards the direction of the clamping sleeve, the driving structure drives the sealing piston to move upwards, so that the sealing piston is separated from a state of being propped against the end face of the fixed plug, and then gas in the gas storage tank can enter the gas tank sequentially through the second communication port and the first communication port, and the gas in the gas tank is supplemented.
Further, the driving structure comprises a floating rod coaxially and fixedly penetrating through the end face of the sealing piston, the lower end of the floating rod penetrates through the fixed plug in a sliding mode and is connected with a direction changing element, and the direction changing element is used for driving the floating rod to move vertically when the sealing sliding sleeve moves horizontally.
Through the technical scheme, when the sealing sliding sleeve moves towards the clamping sleeve, the direction changing element drives the floating rod to move vertically, and then the sealing piston and the fixed plug are separated from a state of abutting against the end face.
Further, the diversion element includes vertical rigid coupling in sealed sliding sleeve peripheral dead lever, the sliding pin is worn to be equipped with in dead lever upper end level fixedly, floating bar lower extreme rigid coupling has the floating plate, the vertical fixedly pull rod that wears to be equipped with of floating plate, the pull rod lower extreme rigid coupling has the connecting block, waist shape hole that supplies the sliding pin to freely pass through has been seted up to the connecting block, waist shape hole length direction has the contained angle with the floating bar axial, the gas tank inner wall is connected with the fixed plate, the fixed plate is worn to locate with the floating rod in a sliding way.
Through the technical scheme, when the sealing sliding sleeve moves, the fixed rod drives the sliding pin to move, the sliding pin slides in the kidney-shaped hole, the sliding pin slides to the lower end from the upper end of the kidney-shaped hole, and then the connecting block can be driven to move upwards, so that the sealing piston is separated from a state propped against the end face of the fixed plug.
Further, a fixing frame is fixedly connected in the middle of the top of the floating plate, and the lower end of the floating rod is fixedly connected to the fixing frame.
Through above-mentioned technical scheme, the mount is located the floating plate in the middle of, makes the floating rod atress comparatively even like this, avoids when a plurality of connecting blocks shift up because the difference of travel that shifts up, and leads to the floating plate slope, and then leads to the floating rod atress uneven to influence floating rod drive seal piston and shift up.
The beneficial effects of the invention are as follows:
(1) According to the invention, a sealing state is formed between a cable hole and the outer wall of the cable, when the pressure of gas in the gas box is reduced, the shrinkage unit is triggered and drives the clamping sleeve to elastically shrink and deform, so that the hole wall of the cable hole clamps the sealing ring, the sealing ring is in closer contact with the surface of the cable, the deformation joint is in a closed state, the leakage phenomenon of the cable and the cable hole is reduced, in addition, when the pressure in the gas box is reduced, the gas supplementing unit acts, so that the gas can be supplemented into the gas box, the pressure in the gas box is increased, the positive pressure state in the gas box is maintained in a short time, the concentration of an insulating gas medium in the gas box is improved, the arc extinction of the gas box is prevented from being greatly influenced, in addition, sufficient time is given to operation and maintenance personnel to perform on site, in addition, the normal use state, the clamping force of the clamping sleeve to the sealing ring is smaller, the sealing ring is prevented from being deformed due to long-term clamping of the cable, and the sealing effect of the sealing ring on the cable is prevented;
(2) According to the invention, air in the air box enters the second cavity through the air holes and generates thrust to the sliding plug, so that the sliding plug overcomes the air pressure resistance in the first cavity and moves until reaching an equilibrium state, when the air pressure in the air box is reduced, the air pressure in the first cavity is greater than the air pressure in the second cavity, and then the sliding plug moves in a direction away from the fixed disc, so that the sliding plug drives the push rod to move, the push rod synchronously drives the extrusion sleeve to move, the inner wall of the conical groove on the extrusion sleeve relatively slides to the outer wall of the clamping sleeve, and extrusion force is generated to the periphery of the extrusion sleeve;
(3) According to the invention, when the air pressure in the air box is reduced, the sliding plug moves, the sealing sliding sleeve moves, and when the sealing sliding sleeve moves, the communicating component is triggered to act, so that the inner cavity of the air outlet seat is communicated with the air box, and the insulating medium gas in the air storage tank enters the air box from the air outlet seat, so that the gas in the air box is supplemented, the gas concentration is improved, and the phenomenon that arc extinction is influenced due to the reduction of the gas concentration in the air box caused by the reduction of the air pressure is reduced;
(4) According to the invention, the fixing frame is positioned in the middle of the floating plate, so that the floating rod is stressed uniformly, and the phenomenon that the floating plate is inclined due to the difference of upward movement strokes when the connecting blocks are moved upwards, so that the floating rod is stressed unevenly is avoided, and the floating rod is influenced to drive the sealing piston to move upwards.
Drawings
FIG. 1 is a schematic diagram of the whole structure of a switchgear using clean air as an insulating medium in the present invention;
FIG. 2 is a schematic illustration of the assembled positional relationship of the seal spacer and the air reservoir in the present invention;
FIG. 3 is an enlarged schematic view of a partial structure at A in FIG. 2;
FIG. 4 is a schematic view of the relationship between the other view angles in FIG. 2;
FIG. 5 is an exploded schematic view of the structure of FIG. 4;
FIG. 6 is an enlarged schematic view of a partial structure at B in FIG. 5;
FIG. 7 is a schematic diagram of the positional relationship of the assembled fixed disk, sealing spacer and sealing sliding sleeve in the present invention;
FIG. 8 is a schematic view of the partial structure of FIG. 7 in a broken away position;
FIG. 9 is an exploded schematic view of the structure of FIG. 7;
Fig. 10 is a schematic view of the positional relationship of the cylindrical sleeve and the clamping sleeve after assembly in the present invention.
The device comprises the following components of a cabinet body, 2, an air box, 3, a fixed disc, 4, a sealing spacer bush, 5, a floating plate, 6, a fixed plate, 7, an air outlet seat, 8, an air storage tank, 9, an extrusion sleeve, 10, a sealing ring, 11, a flange, 12, a deformation joint, 13, a push rod, 14, a cylindrical sleeve, 15, an air vent, 16, a sliding pin, 17, a kidney-shaped hole, 18, a pull rod, 19, a connecting block, 20, a fixed rod, 21, a cable hole, 22, a sealing sliding sleeve, 23, a floating rod, 24, a spring, 25, a spacer ring, 26, a sliding plug, 27, a sealing piston, 28, a second communication port, 29, a fixed plug, 30, a first communication port, 31, a fixed frame, 32, a tubular part, 33, a conical groove, 34, a communication cavity, 35, a sealing ring mounting groove, 36 and a clamping sleeve.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1-10, the embodiment provides a switch cabinet using clean air as an insulating medium, which comprises a cabinet body 1 of the switch cabinet and an air box 2 installed in the cabinet body 1, wherein a plurality of cable penetrating openings are formed in the outer shell of the air box 2, a sealing spacer 4 is inserted in the cable penetrating openings in a tight fit manner, one end of the sealing spacer 4 penetrating out of the outer shell of the air box 2 is coaxially and fixedly connected with a fixed disc 3, the fixed disc 3 is installed on the outer shell of the air box 2 in a screw or rivet mode, and it is noted that threads or rivets cannot penetrate the outer shell of the air box 2 so as to avoid leakage, cable holes 21 in a through hole form are formed in the end surfaces of the fixed disc 3 and the sealing spacer 4, the aperture of the cable holes 21 is matched with the cable diameter of electrical equipment in the air box 2, the cable on the electrical equipment in the air box 2 is penetrated out of the air box 2 by the cable holes 21 and is connected with external electrical equipment, in addition, a rubber layer can be arranged on the wall of the cable hole 21 so as to increase the sealing degree of the cable and the wall of the cable hole 21, one end surface of the sealing spacer 4 penetrating into the air box 2 is coaxially provided with an annular cavity 34, and the inner side of the sealing spacer 4 is formed with an annular spacer 32;
The end face of one end of the sealing spacer sleeve 4 penetrating into the gas tank 2 is coaxially and fixedly connected with a cylindrical sleeve 14, one end of the cylindrical sleeve 14, which is far away from the sealing spacer sleeve 4, is coaxially and fixedly connected with a clamping sleeve 36, the outer diameter of the clamping sleeve 36 increases gradually in a direction far away from the sealing spacer sleeve 4, the clamping sleeve 36 is provided with a cable penetrating hole penetrating through the cylindrical sleeve 14, the periphery of the clamping sleeve 36 is provided with a plurality of deformation joints 12 communicated with the cable penetrating hole, the clamping sleeve 36 is coaxially provided with a sealing ring mounting groove 35, a sealing ring 10 is mounted in the sealing ring mounting groove 35, the inner diameter size of the sealing ring 10 is matched with the outer diameter size of a cable, in addition, one end of the clamping sleeve 36, which is far away from the cylindrical sleeve 14, is fixedly connected with a flange 11 which is made into an inward turn, the flange 11 is used for limiting the movement of the sealing ring 10, and the flange 11 moves towards the direction far away from the fixed disc 3 to generate a limiting effect, so that the sealing ring 10 can be prevented from being separated from the cable penetrating hole, and the sealing effect of the sealing ring 10 on the cable is affected;
The periphery of the cylindrical sleeve 14 is slidingly sleeved with a sealing sliding sleeve 22, one end of the sealing sliding sleeve 22 far away from the sealing spacer 4 is coaxially and fixedly connected with an extrusion sleeve 9, the extrusion sleeve 9 is coaxially provided with a conical groove 33 matched with a clamping sleeve 36, an annular communication cavity 34 is coaxially and slidingly sleeved in the sealing spacer 4, a sliding plug 26 is coaxially and fixedly arranged in the communication cavity 34, the sliding plug 26 separates the communication cavity 34 into two cavities which are not communicated with each other, the two cavities are sequentially defined as a first cavity and a second cavity towards the direction far away from the fixed disc 3, the wall surface of the sealing spacer 4 is provided with an air vent 15 communicated with the second cavity, the end surface of the sliding plug 26 is fixedly connected with a plurality of push rods 13, one end of the push rods 13 penetrating out of the sealing spacer 4 is fixedly connected with the end surface of the extrusion sleeve 9, the opening of the second cavity is fixedly provided with a spacer 25, the end surface of the spacer 25 is provided with a sliding hole for the push rods 13 to freely pass through, gas in the gas box 2 enters the second cavity from the air vent 15, and generates thrust to the sliding plug 26, so that the sliding plug 26 overcomes the air pressure resistance in the first cavity to generate movement until reaching an equilibrium state, when the air pressure in the air box 2 is reduced, the air pressure in the first cavity is larger than the air pressure in the second cavity, and then the sliding plug 26 moves away from the fixed disc 3, so that the sliding plug 26 drives the push rod 13 to move, the push rod 13 synchronously drives the extrusion sleeve 9 to move, the inner wall of the conical groove 33 on the extrusion sleeve 9 generates relative sliding to the outer wall of the clamping sleeve 36, and generates extrusion force to the periphery of the clamping sleeve 36, in addition, a spring 24 is arranged in the first cavity, the spring 24 elastically pushes against the end surface of the sliding plug 26, and gives potential energy for the sliding plug 26 to move away from the fixed disc 3, the spring 24 has elastic pushing force to the sliding plug 26, when the air pressure in the air box 2 is reduced, the sliding plug 26 can move in time and can enable the extrusion sleeve 9 and the clamping sleeve 36 to slide relatively.
The gas tank 2 is internally provided with a transverse gas storage tank 8 through a bracket, the gas storage tank 8 is positioned above the sealing spacer 4, the wall surface of the gas storage tank 8 is provided with a gas outlet seat 7, the inner cavity of the gas outlet seat 7 is communicated with the inner cavity of the gas storage tank 8, the inner cavity of the gas outlet seat 7 is coaxially and fixedly provided with a fixed plug 29, the periphery of the fixed plug 29 and the inner cavity wall of the gas outlet seat 7 are in a sealing state, the end surface of the fixed plug 29 is provided with a plurality of first communication ports 30, the inner cavity of the gas outlet seat 7 is coaxially and slidingly provided with a sealing piston 27, the end surface of the sealing piston 27 is provided with second communication ports 28 which are staggered with the first communication ports 30, the sealing piston 27 is positioned above the fixed plug 29, the propped-against end surfaces of the sealing piston 27 are in a sealing state, the end surface of the sealing piston 27 is coaxially and fixedly provided with a floating rod 23, the periphery of the sealing sliding sleeve 22 is vertically fixedly provided with a fixed rod 20, the upper end of the fixed rod 20 is horizontally and fixedly provided with a sliding pin 16, the floating plate 5 is fixedly connected to the lower end of the floating rod 23, the pull rod 18 is vertically and fixedly arranged on the floating plate 5, the connecting block 19 is fixedly arranged at the lower end of the pull rod 18, the connecting block 19 is provided with a waist-shaped hole 17 for the sliding pin 16 to freely pass through, an included angle is formed between the length direction of the waist-shaped hole 17 and the axial direction of the floating rod 23, the inner wall of the air tank 2 is connected with the fixed plate 6, the floating rod 23 is slidably arranged on the fixed plate 6 in a penetrating manner, the sealing sliding sleeve 22 enables the fixed rod 20 to drive the sliding pin 16 to move when moving, the sliding pin 16 slides in the waist-shaped hole 17, the sliding pin 16 slides from the upper end to the lower end of the waist-shaped hole 17, the connecting block 19 can be driven to move upwards, the sealing piston 27 is separated from a state propped against the end face of the fixed plug 29, and then gas in the air tank 8 can enter the air tank 2 sequentially through the second communication port 28 on the sealing piston 27 and the first communication port 30 on the fixed plug 29, to supplement the gas in the gas tank 2;
When the air pressure in the air tank 2 is recovered, the sliding plug 26 moves reversely, so that the sealing sliding sleeve 22 moves reversely, the sliding pin 16 slides from the lower end of the kidney-shaped hole 17 to the upper end of the kidney-shaped hole 17, the sealing piston 27 can be driven to move downwards, the end face of the sealing piston 27 abuts against the end face of the fixed plug 29, and the first communication port 30 on the end face of the fixed plug 29 and the second communication port 28 on the end face of the sealing piston 27 are in an opened distribution state, so that the abutting face of the end face of the fixed plug 29 abuts against the end face of the sealing piston 27 to be in a sealing state, the air in the air tank 8 cannot continuously enter the air tank 2, in the embodiment, the air pressure in the air tank 8 is consistent with the air pressure in the air tank 2 in a normal working state, or slightly greater than the air pressure in the air tank 2, in addition, the middle of the top of the floating plate 5 is fixedly connected with the fixed frame 31, the lower end of the floating rod 23 is fixedly connected to the fixed frame 31, the fixed frame 31 is positioned in the middle of the floating plate 5, and the fact that the floating rod 23 is stressed uniformly, the abutting face of the fixed frame 23 is in the middle of the floating plate is in a state, the upper moving up stroke is avoided, and the floating rod 23 is driven to move upwards due to the difference of the floating rod 23, and the floating rod 23 is not influenced by the floating rod 23.
The working principle of this embodiment is as follows:
When the pressure of the gas in the gas tank 2 decreases, the outside air is led to enter the gas tank 2 from the leakage position, and the concentration of the specific gas (such as SF6 gas) in the gas tank 2 decreases, the arc extinguishing effect on the electric arc is affected, the leakage position is the connection position of the cable and the gas tank 2, therefore, the connection position of the cable and the gas tank 2 needs to be tightly connected, namely, when the pressure in the gas tank 2 decreases to a certain extent, the spring 24 and the gas in the first cavity act on the end surface of the sliding plug 26 together, so that the sliding plug 26 moves in the direction away from the fixed disc 3, when the sliding plug 26 moves, the push rod 13 is driven to move, the push rod 13 synchronously drives the extrusion sleeve 9 to move, so that the inner wall of the conical groove 33 on the extrusion sleeve 9 relatively slides on the outer wall of the clamping sleeve 36, and the periphery of the clamping sleeve 36 is pressed, the clamping sleeve 36 is pressed along the inner side, and elastic shrinkage deformation is further generated, so that the wall of the sealing ring 10 of the cable hole is tightly contacts the surface of the sealing ring 10, and the sealing sleeve 12 is tightly contacted with the surface of the cable, and the cylindrical deformation joint 12 is prevented from entering the cylindrical joint 21 of the cable 21, and the cylindrical joint 21 is prevented from extending from the sealing joint 21;
in addition, when the sealing sliding sleeve 22 moves, the fixed rod 20 drives the sliding pin 16 to move, so that the sliding pin 16 slides in the kidney-shaped hole 17, the sliding pin 16 slides from the upper end to the lower end of the kidney-shaped hole 17, and then the connecting block 19 can be driven to move upwards, so that the sealing piston 27 is separated from abutting against the end face of the fixed plug 29, and then the gas (the main component is SF6 gas) in the gas storage tank 8 can enter the gas tank 2 through the second communication port 28 on the sealing piston 27 and the first communication port 30 on the fixed plug 29 in sequence, so as to supplement the gas in the gas tank 2;
When the gas in the gas tank 2 is supplemented into the gas tank 2, the gas pressure in the gas tank 2 is gradually increased until the gas pressure approaches the gas pressure in normal operation, and the specific gas is supplemented into the gas tank 2, so that the gas concentration in the gas tank 2 is increased, the influence on the arc extinguishing effect is reduced, in addition, when the gas pressure in the gas tank 2 is restored, the sliding plug 26 moves reversely, the sealing sliding sleeve 22 moves reversely, the sliding pin 16 slides from the lower end of the kidney-shaped hole 17 to the upper end of the kidney-shaped hole 17, the sealing piston 27 can be driven to move downwards, the end face of the sealing piston 27 abuts against the end face of the fixed plug 29, and the first communication port 30 on the end face of the fixed plug 29 and the second communication port 28 on the end face of the sealing piston 27 are in an opened distribution state, so that the abutting face of the fixed plug 29 abuts against the end face of the sealing piston 27 is in a sealing state, and the gas in the gas tank 8 cannot enter the gas tank 2 continuously.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention.
Claims (10)
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| CN202510921442.8A CN120414334B (en) | 2025-07-04 | 2025-07-04 | A switch cabinet using clean air as insulating medium |
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| CN120414334B (en) | 2025-09-12 |
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