CN112951646B - SF6 circuit breaker - Google Patents
SF6 circuit breaker Download PDFInfo
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- CN112951646B CN112951646B CN202110289695.XA CN202110289695A CN112951646B CN 112951646 B CN112951646 B CN 112951646B CN 202110289695 A CN202110289695 A CN 202110289695A CN 112951646 B CN112951646 B CN 112951646B
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- pressure
- relief valve
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- valve
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
- H01H33/53—Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
- H01H33/56—Gas reservoirs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/0413—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded in the form of closure plates
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
- H01H33/72—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid having stationary parts for directing the flow of arc-extinguishing fluid, e.g. arc-extinguishing chamber
- H01H33/74—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid having stationary parts for directing the flow of arc-extinguishing fluid, e.g. arc-extinguishing chamber wherein the break is in gas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
- H01H33/53—Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
- H01H33/56—Gas reservoirs
- H01H2033/568—Gas reservoirs with overpressure release, e.g. rupture membranes
Abstract
An SF6 circuit breaker is characterized in that an SF6 gas charging connector is internally provided with a gas charging one-way valve, and a dust cap is arranged on an SF6 gas charging connector; the dust cap comprises a cap body and a pressure release valve, wherein a discharge pipeline communicated with a cap body cover opening of the dust cap is arranged in the cap body, the cap body cover opening is hermetically connected with an SF6 inflation interface, the pressure release valve is arranged in the discharge pipeline, the discharge threshold value of the pressure release valve is larger than or equal to the rated air pressure of an SF6 circuit breaker and smaller than the actual air pressure of the SF6 circuit breaker, and the opening direction of the pressure release valve is opposite to that of the inflation one-way valve. Even if the gas-filled one-way valve of the container loses the non-return effect, the pressure relief valve can ensure that the pressure in the container is higher than the set pressure, so that the corresponding equipment of the container can be maintained to operate effectively. This is particularly effective for safety devices such as SF6 circuit breakers. In addition, the pressure relief valve seals the discharge pipeline, so that the dust cap has a dust-proof effect.
Description
Technical Field
The invention relates to the field of SF6 circuit breakers, in particular to an SF6 circuit breaker with a dustproof cap.
Background
A sulfur hexafluoride circuit breaker is a circuit breaker using sulfur hexafluoride (SF 6) gas as an arc extinguishing medium and an insulating medium, and is abbreviated as SF6 circuit breaker. When the SF6 circuit breaker is inflated, gas is inflated into an arc extinguish chamber of the circuit breaker body through an inflation valve and a pipeline, and the inflation valve is of a one-way valve structure, namely, SF6 gas can only be inflated from the outside and cannot reversely overflow. In order to ensure the cleanness and the dryness of the inflation connector, the end part of the inflation valve is also provided with a dustproof cap, the existing dustproof cap and the inflation valve are connected in a flange bolt connection and a thread screwing way, the plane of the end part of the inflation valve is generally provided with an O-shaped groove, an O-shaped ring is placed in the groove, and the dustproof cap is connected with the inflation valve and plays a dustproof and moistureproof role.
After the device runs for a long time, the phenomenon of gas leakage of the arc extinguish chamber caused by poor sealing of the valve can be caused by fatigue and abrasion of metal parts in the inflation valve, aging of a rubber ring gasket and the like. However, under the sealing and blocking of the dustproof cap, leaked gas is sealed in a cavity between the dustproof cap and the inflation valve, so that the air leakage defect of the valve cannot be exposed, and meanwhile, the dustproof cap bears pressure, and the equipment operates with defects. When the pressure borne by the dust cap exceeds a certain limit, a burst accident can occur, and huge personal and equipment potential safety hazards exist.
To discover SF in time 6 The circuit breaker inflation valve is invalid, prevents dustproof cap burst accident and secondary accident, needs in time to know the inflation valve operating mode. But is blocked by the dust cap, the dust cap needs to be removed when the working condition of the inflation valve is inspected every time, and if the inflation valve fails, the SF is very easy to be inhaled when the dust cap is removed 6 A gas. If excess SF is inhaled 6 The gas is very easy to cause personal injury.
Typically, the SF is only supplemented into the SF6 circuit breaker 6 The gas will find the one-way valve in the inflation valve to fail. Although the leaked SF is maintained 6 Gas is less harmful to humans, but SF 6 The gas can be decomposed into highly toxic low fluorine compounds under the action of electric arc and corona and in the presence of water. Furthermore, SF 6 The gas is greenhouse effect gas, and the greenhouse effect of a single molecule of the gas is 2.2 ten thousand times that of carbon dioxide.
Disclosure of Invention
The invention aims to provide an SF6 circuit breaker, which can expose the technical problem of air leakage defect of an inflation valve of an SF6 circuit breaker under the condition of not removing a dust cap.
The technical scheme of the invention is as follows:
SF6 circuit breaker, its SF 6 An inflation one-way valve is arranged in the inflation connector, and SF thereof 6 A dustproof cap is arranged on the inflation connector; the dustproof cap comprises a cap body and a pressure release valve, wherein a pressure release pipeline communicated with a cap cover opening of the cap body is arranged in the cap body, and the cap cover opening is communicated with SF 6 The gas charging interface is hermetically connected, the pressure relief valve is arranged in the discharge pipeline, the discharge threshold of the pressure relief valve is larger than or equal to the rated air pressure of the SF6 circuit breaker and smaller than the actual air pressure of the SF6 circuit breaker, and the opening direction of the pressure relief valve is opposite to that of the gas charging one-way valve.
Preferably, the dust cap further comprises a pressure exposure device; and when the internal pressure of the relief pipeline exceeds the relief threshold value, the pressure exposure device is switched from a normal working condition to an abnormal working condition.
Preferably, the internal fluid that still is equipped with of cap is used for the receipts to hold the fluid that the relief valve was released holds the chamber, pressure exposure device is including pressing the variable sheet the cap body corresponding to the fluid is held and is equipped with on the wall body in chamber and lead the pressure mouth, press the variable sheet with cap body fixed connection is in order to seal lead the pressure mouth. Wherein, press the variable gauge and refer to the lamellar body that its shape, physical and chemical properties can take place discernable change after the pressurized. The pressure variable sheet can be a pressure variable sheet, such as an elastic sheet; or a pressed color-changing sheet, for example, the color of the sheet body with color becomes light after being pressed and thinned; the pressure-variable sheet may also be a pressure-variable resistive sheet.
Further preferably, the pressure variable piece is an elastic membrane.
Further preferably, the pressure transformer is provided with a warning color. Typically, the warning color is yellow or red, but other colors may be specified.
Preferably, the pressure exposure device comprises a vibration sounding part, a whistle hole is formed in the discharge side of the pressure release valve of the discharge pipeline, and the vibration sounding part is arranged in the whistle hole.
Preferably, the pressure relief valve is a displacement portion that switches from a cutoff process to an opening process, and constitutes the pressure exposure device. Wherein, the relief valve is by the aversion portion that the switching opened the process of ending to have generally: the relief valve core, relief valve core reset the expansion end of piece.
Preferably, the pressure exposure device working condition detection system further comprises a pressure exposure device working condition detection system, the pressure exposure device working condition detection system comprises a pressure release valve opening detector and an output module, the pressure release valve opening detector is used for outputting a pressure release valve opening signal when the pressure release valve is opened, and the output module is used for receiving the pressure release valve opening signal and outputting abnormal working condition information of the pressure exposure device.
Preferably, a valve core of the pressure relief valve is fixedly connected with a linkage rod, and the pressure relief valve opening detector comprises a position switch for detecting the position of the linkage rod.
Further preferably, the pressure exposure device working condition detection system further comprises a communication module, the communication module comprises a first communication submodule and a second communication submodule which are arranged at different positions, the first communication submodule is coupled with the pressure relief valve opening detector, and the second communication submodule is coupled with the output module.
Preferably, the rated air pressure of the SF6 breaker is more than or equal to 1 and less than 1.05.
The invention has the beneficial effects that:
1. according to the invention, the relief valve is arranged to set the relief threshold value, so that the accuracy of abnormal pressure exposure in the cavity communicated with the cap opening of the cap body can be improved. The relief valve is not less than the rated air pressure of the SF6 breaker and less than the actual air pressure of the SF6 breaker, so that even if the check effect of the gas-filled check valve of the container is lost, the pressure in the container can be ensured to be higher than the set pressure by the relief valve, and the effective operation of equipment corresponding to the container can be maintained. This is particularly effective for safety devices such as SF6 circuit breakers. In addition, the pressure relief valve seals the discharge pipeline, so that the dust cap has a dust insulation effect. Even if the pressure relief valve is in an opening state, the fluid can be prevented from reversely entering under the flowing of the fluid due to the existence of the leaked fluid between the cover opening side of the cap body and the pressure relief opening of the pressure relief valve.
Generally, those skilled in the art consider solving the problem that the SF6 breaker cannot operate effectively when the pressure is lower than the rated pressure due to the failure of the gas-filled check valve, and usually consider a redundant configuration. However, when the redundancy configuration is carried out, one-way valve is selected to be redundantly configured instead of one pressure release valve, because the opening direction of the pressure release valve is outward one-way opening, and the one-way valve is inward one-way opening.
2. The pressure release valve seals the discharge pipeline, so that the dust cap has a dust insulation effect. Only when the internal pressure in the pipeline of releasing exceeded the relief threshold value, the pressure exposure device just can switch to the abnormal condition, can discern the appearance intracavity abnormal pressure with cap body lid mouth intercommunication through the abnormal condition of discernment pressure exposure device. When the volume of the cavity is not changed, the change of the temperature can also cause the change of the pressure of the fluid in the cavity, and the change can influence the accuracy of the detection of the abnormal pressure in the cavity. Therefore, after the release threshold value is set, the error exposure of the pressure exposure device caused by temperature change can be eliminated by the proper release threshold value, namely the definition of the boundary between the normal working condition of the pressure exposure device and the abnormal working condition of the pressure exposure device can be improved, so that the accuracy of the abnormal pressure exposure in the cavity communicated with the cap opening of the cap body is improved.
3. After the pressure variable sheet of the pressure exposure device forms part or all wall bodies of the fluid storage cavity, even if the temperature change can lead to the change of the internal pressure of the fluid storage cavity, and further leads to the volume change of the fluid storage cavity, after the release threshold value is set, the error exposure of the pressure exposure device caused by the temperature change can be eliminated by the proper release threshold value, namely, the definition of the boundary of the normal working condition of the pressure exposure device and the abnormal working condition of the pressure exposure device can be improved, and the accuracy of the abnormal pressure exposure in the cavity communicated with the cap opening of the cap body is improved.
4. When the internal pressure of the relief pipeline exceeds the relief threshold value, the relief valve is switched from the cut-off state to the opening state, and a switching process also exists, so that the function of the pressure exposure device can be realized by the shifting part of the relief valve from the cut-off state to the opening state.
5. After the additional pressure exposes operating mode detecting system, the detection relief valve that can be comparatively convenient is by ending switching for opening the in-process, and the pressure exposes the device and switches into the short-time switching of abnormal state operating mode by the normality operating mode to reduce the discovery degree of difficulty that this type of short-time switched.
6. After the pressure exposure working condition detection system is additionally provided with the communication module, the pressure relief valve opening detector and the output module can be arranged at far positions, and the manpower communication cost or the traffic cost is reduced.
Drawings
Fig. 1 is a front view of a dust cap of the present invention.
Fig. 2 is a rear view of fig. 1.
Fig. 3 is a sectional view a-a of fig. 2.
Fig. 4 is a cross-sectional exploded view of the inflation valve.
Fig. 5 is a cross-sectional view of yet another dust cap of the present invention.
FIG. 6 is a circuit diagram of a pressure exposure device condition detection system for a dust cap.
The reference number indicates that 2-cap body, 20-wall body, 201-pressure relief valve installation seat, 202-hexagonal wrench face, 211-cap body cover opening, 212-discharge pipeline, 213-fluid storage cavity, 214-pressure guide opening, 3-pressure relief valve, 31-pressure spring, 32-pressure relief valve core, 33-pressure relief cap, 4-pressure variable sheet, 5-pressure variable sheet fixing cap, 51-observation opening, 61-first sealing ring, 62-second sealing ring, 63-third sealing ring, 71-travel switch and 72-PCB board.
Detailed Description
The present invention is described below in terms of embodiments in conjunction with the accompanying drawings to assist those skilled in the art in understanding and implementing the present invention. Unless otherwise indicated, the following embodiments and technical terms therein should not be understood to depart from the background of the technical knowledge in the technical field.
SF6 breaker of the invention 6 An inflation one-way valve is arranged in the inflation connector, and SF thereof 6 A dust cap is arranged on the inflation connector; referring to fig. 1-6, the dust cap comprises a cap body 2 and a pressure release valve 3, a pressure release pipeline 212 communicated with a cap opening of the cap body is arranged in the cap body 2, and the cap opening and the SF are arranged 6 Air-filled connectorThe ports are connected in a sealing mode, the pressure relief valve 3 is arranged in the pressure relief pipeline 212, the pressure relief threshold value of the pressure relief valve 3 is larger than or equal to the rated air pressure of the SF6 circuit breaker and smaller than the actual air pressure of the SF6 circuit breaker, and the opening direction of the pressure relief valve 3 is opposite to that of the inflating one-way valve.
In general, when the SF6 circuit breaker is used in the field, SF6 gas having a rated gas pressure of 1.1 to 1.2 times is charged into the SF6 gas chamber. Therefore, the discharge threshold is set, namely the rated air pressure of the SF6 circuit breaker is more than or equal to 1 and less than 1.05, so that the effective work of the SF6 circuit breaker can be maintained, and the discharge effect can be realized after the gas-filled one-way valve fails.
After the gas pressure between the inflation one-way valve and the pressure release valve is larger than or equal to the release threshold of the pressure release valve, the pressure release valve opens the release pipeline 212, and the gas can be released through the pressure release valve 212. The relief valve 3 has a relief threshold not less than the rated air pressure of the SF6 circuit breaker and less than the actual air pressure of the SF6 circuit breaker, so that the relief valve can maintain the pressure in the SF6 air chamber of the SF6 circuit breaker to meet the working requirement even if the gas charging one-way valve fails.
The pressure relief valve seals the discharge pipeline, so that the dust cap has a dust-proof effect. Even when the pressure relief valve is in an opening state, the fluid can be prevented from reversely entering under the flowing of the fluid due to the fact that the fluid which is discharged exists between the cover opening side of the cap body and the discharge opening of the pressure relief valve.
In order to find out the failure fault of the inflation one-way valve in time after the inflation one-way valve fails. The dust cap may further comprise pressure exposure means. A pressure relief valve 3 is provided in the relief conduit 212 for relieving fluid when the internal pressure in the relief conduit 212 exceeds a relief threshold. That is, the relief threshold is the opening pressure value of the relief valve 3.
When the internal pressure of the relief pipeline 212 exceeds the relief threshold value, the pressure exposure device is switched from a normal working condition to an abnormal working condition.
Wherein the cap body 2 is covered on the SF 6 When the inflation interface is up, the tube interface, cap 2 and pressure relief valve 3 form a first volume, of which the relief conduit 212 is part. When the pressure of the fluid in the cavity exceeds the opening pressure of the pressure release valve 3, the pressure release valve 3 is opened, and the fluid in the first cavity is discharged through the pressure release port of the pressure release valve 3.
Example 1: SF6 circuit breaker, its SF 6 An inflation one-way valve is arranged in the inflation connector, and SF thereof 6 The inflation connector is provided with a dustproof cap, the cap body cover opening of the dustproof cap and SF 6 The inflation interface is connected in a sealing way.
Referring to fig. 1-4, the dust cap includes a cap body 2, a pressure relief valve 3, and a pressure exposure device.
The cap body 2 is provided with a discharge pipe 212 communicated with the cap body cover opening 211 and a fluid storage cavity 213 for storing fluid discharged by the pressure release valve 3.
Wherein a pressure relief valve 3 is provided in the relief conduit 212 for relieving fluid when the internal pressure in the relief conduit 212 exceeds a relief threshold. That is, the relief threshold is the opening pressure value of the relief valve 3. The discharge threshold value of the pressure release valve 3 is larger than or equal to the rated air pressure of the SF6 circuit breaker and smaller than the actual air pressure of the SF6 circuit breaker, and the opening direction of the pressure release valve 3 is opposite to that of the gas charging one-way valve.
When the internal pressure of the relief pipeline 212 exceeds a relief threshold value, the pressure exposure device is switched from a normal working condition to an abnormal working condition.
When the cap body 2 is covered on the pipe connector (not shown), the pipe connector, the cap body 2 and the pressure release valve 3 form a first cavity, and the pressure release pipe 212 is a part of the first cavity. When the pressure of the fluid in the first receiving chamber exceeds the opening pressure of the relief valve 3, the relief valve 3 opens, and the fluid in the first receiving chamber is discharged into the fluid storage chamber 213 through the relief port of the relief valve 3.
In this embodiment, the pressure exposure device includes a pressure-variable plate 4, a pressure-guide opening 214 is formed on a wall body of the cap body 2 corresponding to the fluid storage chamber 213, and the pressure-variable plate 4 is fixedly connected to the cap body 2 to seal the pressure-guide opening 214.
Wherein, the pressing variable sheet 4 refers to a sheet body of which the shape and the physical and chemical properties can be changed in a recognizable way after being pressed. The pressure variable sheet can be a pressure variable sheet, such as an elastic sheet; or a pressed color-changing sheet, for example, the color of the sheet body with color becomes light after being pressed and thinned; the pressure variable sheet can also be a pressure variable resistance sheet, namely a sheet body with a resistance value which can be changed after being pressed.
The orifice cross-section of the pressure guide port 214 is preferably sized to allow the change in the pressure variable plate to be clearly recognized.
In this embodiment, the pressure variable piece 4 is an elastic membrane. After the pressure relief valve 3 is opened, the pressure in the fluid reservoir 213 is the same as the pressure in the first volume, and the fluid pressure in the fluid reservoir 213 acts on the elastic diaphragm via the pressure port 214, and the elastic diaphragm is pressed and expanded.
In this embodiment, a warning color is further provided on the elastic membrane. The warning color can be the material color of the elastic membrane or the warning color is adhered to the elastic membrane. Typically, the warning color is yellow or red, but other colors may be specified.
Referring to fig. 1 to 4, the cap body 2 is formed by a wall body 20, a hexagonal wrench face 202 is provided on an outer wall of the wall body 20, an internal thread is provided on an inner wall of the cap cover 211 of the wall body 20, a discharge pipe 212, a fluid storage cavity 213 and a pressure guide port 214 are further provided in the wall body 20, a pressure relief valve mounting seat 201 is further provided between the discharge pipe 212 and the fluid storage cavity 213 of the wall body 20, the pressure relief valve 3 is provided on the pressure relief valve mounting seat 201, and the pressure relief valve 3 only allows fluid in the discharge pipe 212 to be discharged into the fluid storage cavity 213. The pressing variable piece 4 is fixedly connected with the cap body 2 to seal the pressure guide opening 214.
Referring to fig. 3-4, the relief valve 3 is composed of a relief valve mounting seat 201, a relief valve spool reset member 31, a relief valve spool 32, and a relief cap 33, and the relief valve spool reset member 31 generally selects a compression spring. The pressure relief valve mounting seat 201 is provided with a first through hole for forming a pressure relief channel, and the pressure relief cap 33 is provided with a second through hole for forming a part of the pressure relief channel. The pressure relief cap 33 is in threaded connection with the pressure relief valve mounting seat 201, the pressure relief valve core resetting piece 31 and the pressure relief valve core 32 are arranged in the cavity between the pressure relief cap 33 and the pressure relief valve mounting seat, one end of the pressure relief valve core resetting piece 31 abuts against the pressure relief valve mounting seat, and the other end abuts against the pressure relief valve core 32, so that the pressure relief valve core 32 blocks the second through hole. In order to enhance the sealing performance of the relief valve 3, a second sealing ring 62 is arranged on the connecting surface between the relief valve cap 33 and the relief valve mounting seat 201, a first sealing ring 61 is arranged on the connecting surface between the relief valve spool 32 and the relief valve cap 33, and the first sealing ring 61 is fixedly connected to the relief valve spool 32 or the relief valve cap 33.
In order to replace the pressure variable sheet 4 conveniently, a rigid frame is fixed on the outer ring of the pressure variable sheet 4. When the pressure-variable piece 4 is installed, the pressure-variable piece corresponds to the pressure guide port 214, the rigid frame is sleeved outside the pressure guide port 214, the rigid frame is pressed on the cap body 2 through the pressure-variable piece fixing cap 5, and the pressure-variable piece 4 is fixed on the cap body 2. Generally, the pressing variable piece fixing cap 5 can be in threaded connection with the cap body 2. In order to observe the change of the pressure variable piece 4, an observation port 51 is provided at a position of the pressure variable piece fixing cap 5 corresponding to the pressure guide port 214.
Example 2: SF6 circuit breaker, its SF 6 An inflation one-way valve is arranged in the inflation connector, and SF thereof 6 The inflation connector is provided with a dustproof cap, the cap body cover opening of the dustproof cap and SF 6 The inflation interface is connected in a sealing way.
Referring to fig. 1-4, the dust cap includes a cap body 2, a pressure relief valve 3 and a pressure exposure device.
Wherein, a discharge pipeline 212 communicated with the cap cover opening 211 of the cap body 2 and a discharge pipeline used for guiding the fluid discharged by the pressure release valve 3 are arranged in the cap body.
Wherein a pressure relief valve 3 is provided in the relief conduit 212 for relieving fluid when the internal pressure of the relief conduit 212 exceeds a relief threshold. That is, the relief threshold is the opening pressure value of the relief valve 3. The discharge threshold value of the pressure release valve 3 is more than or equal to the rated air pressure of the SF6 circuit breaker and less than the actual air pressure of the SF6 circuit breaker, and the opening direction of the pressure release valve 3 is opposite to that of the gas charging one-way valve.
When the internal pressure of the relief pipeline 212 exceeds the relief threshold value, the pressure exposure device is switched from a normal working condition to an abnormal working condition.
In this embodiment, the pressure exposure device selects the whistle sheet, a whistle hole is formed in the discharge pipe, and the whistle sheet is disposed in the whistle hole.
When the cap body 2 is covered on the pipe connector (not shown), the pipe connector, the cap body 2 and the pressure release valve 3 form a first cavity, and the pressure release pipe 212 is a part of the first cavity. When the pressure of the fluid in the first accommodating cavity exceeds the opening pressure of the pressure release valve 3, the pressure release valve 3 is opened, and the fluid in the first accommodating cavity is released into the release pipeline through a pressure release port of the pressure release valve 3. When the whistle flows through the whistle hole of the discharge pipeline, the whistle sheet is blown to vibrate, and the whistle sheet makes a sound. The vibration of the whistle plate and the sound produced are both the expressions of the abnormal working conditions of the pressure exposure device.
Example 3: SF6 circuit breaker, its SF 6 An inflation one-way valve is arranged in the inflation connector, and SF thereof 6 The inflation connector is provided with a dustproof cap, the cap body cover opening of the dustproof cap and SF 6 The inflation interface is connected in a sealing way.
Referring to fig. 5-6, the dust cap includes a cap body 2, a pressure relief valve 3, and a pressure exposure device.
Wherein, a discharge pipeline 212 communicated with the cap opening 211 of the cap body is arranged in the cap body 2.
Wherein a pressure relief valve 3 is provided in the relief conduit 212 for relieving fluid when the internal pressure in the relief conduit 212 exceeds a relief threshold. That is, the relief threshold is the opening pressure value of the relief valve 3. The discharge threshold value of the pressure release valve 3 is larger than or equal to the rated air pressure of the SF6 circuit breaker and smaller than the actual air pressure of the SF6 circuit breaker, and the opening direction of the pressure release valve 3 is opposite to that of the gas charging one-way valve.
When the internal pressure of the relief pipeline 212 exceeds a relief threshold value, the pressure exposure device is switched from a normal working condition to an abnormal working condition.
When the cap body 2 is covered on the pipe connector (not shown), the pipe connector, the cap body 2 and the pressure release valve 3 form a first cavity, and the pressure release pipe 212 is a part of the first cavity. When the pressure of the fluid in the first containing cavity exceeds the opening pressure of the pressure release valve 3, the pressure release valve 3 is opened, and the fluid in the first containing cavity is released through the pressure release opening of the pressure release valve 3.
In combination with the working principle of the relief valve, the relief valve 3 is a pressure exposure device formed by a displacement part in the process of switching from cut-off to opening. Wherein, the relief valve 3 is by the aversion portion that the end switch switched to the process of opening generally has: a relief valve core 32 and a movable end of a relief valve core resetting piece 31. The movable end of the relief valve spool reset member is said to be opposite to its stationary end, i.e. it is the end that presses against the relief valve spool 32.
When the pressure release valve 3 is mainly composed of the displacement portion which is used for switching the pressure release valve 3 from the cut-off state to the opening state, and the pressure in the first containing cavity is released and is lower than the opening pressure of the pressure release valve 3, the pressure release valve 3 is restored from the opening state to the cut-off state, and at the moment, the displacement portion which is used for switching the pressure release valve 3 from the cut-off state to the opening state is reset. Generally, this process is relatively short, and therefore a memory structure, which may be a mechanical structure or a circuit structure, is needed to record that the pressure exposure device has been switched into an abnormal condition.
In this embodiment, referring to fig. 6, the dust cap further comprises a pressure exposure device operating condition detection system. The pressure exposure device working condition detection system comprises a pressure release valve opening detector and an output module, wherein the pressure release valve opening detector is used for outputting a pressure release valve opening signal when the pressure release valve is opened, and the pressure release valve opening detector can select a position switch SQ; the output module is used for receiving the opening signal of the pressure relief valve, outputting abnormal working condition information of the pressure exposure device, and the output module can select the buzzer HA and also can select the lamp. The output module can be mounted on the PCB 72, and the PCB 72 is preferably fixed in the cap body 2 and has a through hole for discharging fluid with the cap body 2. The power source can adopt button batteries.
Referring to fig. 5, in order to identify the moving position of the relief valve spool 32, an interlock lever is fixedly connected to the relief valve spool 32, and the relief valve opening detector includes a position switch 71 for detecting the position of the interlock lever. For example, in fig. 5, the position switch 71 is a normally open position switch, and when the relief valve is in an open state, the linkage rod triggers the position switch 71 to output a switch signal. The circuit is conducted, and the buzzer gives out alarm sound.
In order to remotely obtain the working state of the pressure exposure device, the working condition detection system of the pressure exposure device further comprises a communication module (not shown), the communication module comprises a first communication sub-module and a second communication sub-module, the first communication sub-module and the pressure release valve are arranged at different positions, the first communication sub-module is in coupling connection with the detector, and the second communication sub-module is in coupling connection with the output module. The coupling connection may be a mechanical coupling, a circuit coupling, an electro-optical coupling, or the like.
The invention is described in detail above with reference to the figures and examples. It should be understood that in practice the description of all possible embodiments is not exhaustive and that the inventive concepts are described herein as far as possible by way of illustration. Without departing from the inventive concept of the present invention and without any creative work, a person skilled in the art should, in all of the embodiments, make optional combinations of technical features and experimental changes of specific parameters, or make a routine replacement of the disclosed technical means by using the prior art in the technical field to form specific embodiments, which belong to the content implicitly disclosed by the present invention.
Claims (2)
1. An SF6 circuit breaker is characterized in that an inflation one-way valve is arranged in an SF6 inflation port, and a dustproof cap is arranged on an SF6 inflation port; the dustproof cap is characterized by comprising a cap body and a pressure relief valve, wherein a pressure relief pipeline communicated with a cap cover opening of the cap body is arranged in the cap body, the cap cover opening is hermetically connected with the SF6 inflation interface, the pressure relief valve is arranged in the pressure relief pipeline, a pressure relief threshold of the pressure relief valve is greater than or equal to rated air pressure of an SF6 circuit breaker and smaller than actual air pressure of the SF6 circuit breaker, and the opening direction of the pressure relief valve is opposite to that of the inflation one-way valve;
the dust cap further comprises a pressure exposure device; when the internal pressure of the relief pipeline exceeds the relief threshold value, the pressure exposure device is switched from a normal working condition to an abnormal working condition;
the cap body is internally provided with a fluid storage cavity for storing fluid discharged by the pressure release valve, the pressure exposure device comprises a pressure variable sheet, a wall body of the cap body, which corresponds to the fluid storage cavity, is provided with a pressure guide hole, and the pressure variable sheet is fixedly connected with the cap body so as to seal the pressure guide hole;
the pressure variable sheet is an elastic membrane;
the relief valve is by the relief valve mount pad, the relief valve case resets the piece, relief valve case and pressure release cap are constituteed, the pressure spring is selected to the relief valve case that resets, be equipped with the first perforation that is used for forming the pressure release passageway on the relief valve mount pad, be equipped with the second perforation that is used for forming partial pressure release passageway on the pressure release cap, pressure release cap and relief valve mount pad threaded connection, the relief valve case resets and the relief valve case sets up the appearance intracavity between pressure release cap and pressure release valve mount pad, and relief valve case resets one end and supports presses the relief valve mount pad, the other end supports presses the relief valve case, so that relief valve case shutoff second is perforated.
2. The SF6 circuit breaker of claim 1, wherein the bleed-off threshold is SF6 circuit breaker rated gas pressure ≧ 1 and < 1.05.
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| CN202110289695.XA CN112951646B (en) | 2021-03-18 | 2021-03-18 | SF6 circuit breaker |
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| CN202110289695.XA CN112951646B (en) | 2021-03-18 | 2021-03-18 | SF6 circuit breaker |
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| CN112951646B true CN112951646B (en) | 2022-09-09 |
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| CN112951646A (en) | 2021-06-11 |
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