CN118009222A - SF6-N2 mixed gas filling device - Google Patents
SF6-N2 mixed gas filling device Download PDFInfo
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- CN118009222A CN118009222A CN202410424992.4A CN202410424992A CN118009222A CN 118009222 A CN118009222 A CN 118009222A CN 202410424992 A CN202410424992 A CN 202410424992A CN 118009222 A CN118009222 A CN 118009222A
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- 238000003860 storage Methods 0.000 claims abstract description 55
- 230000006698 induction Effects 0.000 claims description 28
- 238000007789 sealing Methods 0.000 claims description 24
- 230000008602 contraction Effects 0.000 claims description 16
- 230000001105 regulatory effect Effects 0.000 claims description 14
- 238000009792 diffusion process Methods 0.000 claims description 11
- 238000005520 cutting process Methods 0.000 claims description 10
- 238000007872 degassing Methods 0.000 claims description 8
- 239000012528 membrane Substances 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 238000009991 scouring Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 6
- 238000011010 flushing procedure Methods 0.000 abstract description 4
- 229910018503 SF6 Inorganic materials 0.000 description 74
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 74
- 239000007789 gas Substances 0.000 description 71
- 238000000034 method Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 8
- 230000009471 action Effects 0.000 description 7
- 230000005389 magnetism Effects 0.000 description 6
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229960000909 sulfur hexafluoride Drugs 0.000 description 1
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- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses an SF6-N2 mixed gas filling device, which is used for filling mixed gas into an electric element, and comprises a carrier, a flow guiding device and a storage device, wherein the flow guiding device is connected with the carrier, the storage device is communicated with a carrier pipeline, an upper air passage and a lower air passage are respectively arranged on the carrier, the storage device comprises a first storage tank and a second storage tank, the first storage tank is communicated with the upper air passage pipeline, the second storage tank is communicated with the lower air passage pipeline, the flow guiding device is used for switching a gas flow path, the first storage tank is used for supplying SF6, the second storage tank is used for supplying N2, the gas supply precision is improved in an up-down layered supply mode, the flow guiding device is mainly used for switching the flow path, and after the SF6 gas supply is completed, the N2 is used for flushing the upper air passage through the flow path switching, so that the supplied SF6 is ensured to completely enter the electric element.
Description
Technical Field
The invention relates to the technical field of gas filling, in particular to an SF6-N2 mixed gas filling device.
Background
Sulfur hexafluoride (SF 6) is widely used in high voltage electric appliances with its excellent electric insulation properties, however, with the massive use of SF6, filled and replaced SF6 is discharged into the atmosphere in a massive amount, SF6 is a strong greenhouse gas, which causes a certain harm to the environment. Therefore, reducing the use of SF6 gas becomes a potential trend while ensuring a certain insulation strength.
SF6-N2 mixed gas, wherein the proportion of SF6 is about 30%, so that the use of SF6 gas is greatly reduced, and meanwhile, certain electric insulation strength is ensured. However, in the process of filling the SF6-N2 mixed gas, the proportion of each component in the mixed gas cannot be accurately ensured due to the fact that gas is easy to remain in a pipeline, so that the final filling accuracy cannot be ensured, and the electrical insulation performance is affected to a certain extent.
In addition, the conventional filling device is easy to cause air to enter the conveying pipeline, and the purity of the mixed gas is affected. Meanwhile, whether SF6 and N2 gases are conveyed simultaneously or sequentially, the mixing degree is poor, and the mixed state can be achieved only by standing for about 30 minutes, so that the subsequent precision inspection is affected.
Disclosure of Invention
The invention aims to provide an SF6-N2 mixed gas filling device so as to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme:
the utility model provides a SF6-N2 mixed gas fills device, fills the device and is used for filling mixed gas to the electrical component in, fills the device and includes carrier, guiding device and storage device, guiding device and carrier connection, storage device and carrier pipeline intercommunication are equipped with upper airway and lower air flue on the carrier respectively, and storage device includes first storage tank and second storage tank, first storage tank and upper airway pipeline intercommunication, second storage tank and lower air flue pipeline intercommunication, and guiding device is used for carrying out the gas flow path switching.
The mixed gas is filled into the electric element through the filling device, the electric element is mainly high-voltage power equipment in the electric industry and the electric industry, the electric element is guaranteed to have good insulating property through filling the mixed gas, the first storage tank is used for supplying SF6, the second storage tank is used for supplying N2, the gas supply precision is improved through an upper-lower layered supply mode, the carrier serves as a main installation base and is used for carrying other devices, the carrier can be in a box frame design, wheels can be arranged at the bottom of the carrier for improving mobility, the portable design is carried out, the flow guiding device is mainly used for carrying out flow path switching, after SF6 gas supply is completed, the N2 is used for flushing an upper air passage through the flow path switching, and therefore the supplied SF6 is guaranteed to enter the electric element.
Further, the storage device further comprises two stop valves and a regulating valve, the two stop valves are respectively positioned at the inlet and outlet positions of the upper air passage, the regulating valve is positioned at the inlet position of the lower air passage, a uniform mixing cavity is arranged on the carrier, the tail ends of the upper air passage and the lower air passage are respectively communicated with the uniform mixing cavity, a filling opening is arranged on the electric element, the uniform mixing cavity is communicated with the filling opening, the flow guiding device comprises a sealing plate and an electromagnet, a switching flow passage is arranged on the carrier, two ends of the switching flow passage are respectively communicated with the upper air passage and the lower air passage, the sealing plate is rotationally connected with the upper end of the switching flow passage, the electromagnet is arranged in the switching flow passage, and the sealing plate is made of a magnet material;
when the power is on: the opposite ends of the electromagnet and the sealing plate are provided with different-name magnetic poles;
Initial state: the stop valve and the regulating valve are both in an on state, the electromagnet is in an on state, and the switching flow passage and the upper air passage are in an off state.
The stop valve sets up the import and export of upper airway, adopt electronic model, two stop valves coordinated control, switch on simultaneously or cut off simultaneously, the regulator valve is used for controlling the instantaneous air input of lower airway, after SF6 and N2 admit air and accomplish, with its leading-in homomixing intracavity, mix, and send into electrical component through filling the mouth, the electro-magnet circular telegram process, the magnetic pole and the closing plate that show are the synonym magnetic pole, when the electro-magnet circular telegram promptly, can adsorb the closing plate, thereby make the switching runner upper end and upper airway switch on, under the initial condition, SF6 and N2 supply air through upper airway and lower airway respectively, send into homomixing intracavity and carry out preliminary mixing, through split type air supply, carry out terminal mixing, prevent gas series flow, be convenient for carry out classified storage, be favorable to guaranteeing the air feed precision.
Further, the lower air passage is sequentially provided with an inlet section, a contraction section, a throat and a diffusion section along the air flow conveying direction, the second storage tank is communicated with the inlet section, the diffusion section is communicated with the uniform mixing cavity, one side of the throat is provided with a drainage passage, and one end of the drainage passage, which is far away from the throat, is communicated with the upper air passage;
Degassing: the two shut-off valves are in the shut-off state.
The proportion of SF6 in SF6-N2 mixed gas is about 30%, N2 is more than SF6 gas quantity, when N2 circulates along a plurality of sectional paths of the lower airway, the N2 enters the contraction section through the change of diameter, the contraction section is compressed, the SF6 enters the throat after the compression is finished, the pressure of the throat is reduced due to the reduction of the overflow section and the increase of the flow velocity, negative pressure is formed in the throat, the throat is communicated with the upper airway, part of SF6 enters the N2 for premixing, after SF6 gas supply is finished, both ends of the upper airway are simultaneously cut off through two stop valves, residual SF6 gas in the upper airway continuously enters the throat through the throat under the action of negative pressure, SF6 allowance in a pipe is reduced, and gas distribution precision is improved.
Further, the diameter of the contraction section is gradually decreased along the gas conveying direction, and the switching flow passage inlet is positioned in the contraction section;
The scouring time is as follows: the electromagnet is powered off, and the switching runner is conducted with the upper air passage.
The diameter of the contraction section is gradually decreased, the contraction section is used for compressing N2 gas, after degassing is completed, the electromagnet is not electrified any more, the magnetism of the end part of the electromagnet disappears, the sealing plate is not adsorbed, N2 rushes into the upper air passage from the switching flow passage, SF6 gas participated in by negative pressure adsorption in the upper air passage is flushed, and is wrapped in the throat entering from the drainage passage and finally discharged into the uniform mixing cavity, so that SF6 gas output from the first storage tank can completely enter the inner cavity of the electric element, SF6 residual air in the pipeline conveying process is avoided, and the final proportioning precision is affected.
Further, the uniform mixing cavity comprises an inner flow channel and an outer flow channel, an outlet of the upper air channel faces the inner flow channel, and the tail end of the diffusion section is communicated with the outer flow channel.
The diameter of the inner flow channel is smaller, the SF6 flow rate is faster than the N2 flow rate in the outer flow channel, when SF6 flows out from the inner flow channel, the friction between gases is smaller, the wall friction between N2 and the outer flow channel is larger, and dragging flow is formed, so that SF6 has a trend of moving to N2, the diffusion mixing performance is improved, the gases entering the electric element are in a mixed state, and the electric element can be used without waiting for mixing for a long time.
Further, the guiding device further comprises a cutting component, the carrier is provided with a pressure sensing cavity, the pressure sensing cavity is located on one side of the uniform mixing cavity, the cutting component comprises a pressure sensing diaphragm and an induction coil, the pressure sensing diaphragm is located at the joint of the pressure sensing cavity and the uniform mixing cavity, the induction coil is arranged in the pressure sensing cavity, the pressure sensing diaphragm extends upwards to be provided with an induction rod, and the upper end of the induction rod stretches into an inner ring of the induction coil.
Through setting up the pressure sensing chamber in homomixing chamber one side, interface department sets up the pressure sensing diaphragm, after the mixed gas fills in the electrical component finishes, can make the pressure increase in the homomixing chamber, the pressure sensing diaphragm takes place deformation under the pressure effect, drive the induction pole and remove, induction coil is cutting magnetism induction line motion, and produce induced current, when the induced current value that induction coil produced reaches the standard value, it finishes to aerify in the electrical component promptly, under the prerequisite that the SF6 of first storage tank output got into in the electrical component completely, when reaching predetermined pressure, the N2 of input is quantitative too, thereby guarantee that the filling of mixed gas is quantitative filling, and SF6 and N2 proportion are fixed, guarantee the filling precision.
As an optimization, the induction rod and the induction coil form a detection circuit, and the detection circuit is electrically connected with the regulating valve. When the current collected by the induction coil reaches the standard value, namely the mixed gas filled in the electric element reaches the standard value, the air inlet valve at the inlet of the electric element is closed, and the regulating valve is controlled to close N2 supplied by the second storage tank, so that the aim of automatic stop after full filling is fulfilled.
Preferably, the axis of rotation of the seal plate is located adjacent to the inlet side of the upper airway. The rotary axis of the sealing plate is arranged on one side close to the inlet of the upper air passage, and in an initial state, after SF6 enters the upper air passage, the gas pressure can assist the electromagnet to be attached to the sealing plate, so that the cut-off performance of the switching flow passage and the upper air passage is ensured.
Compared with the prior art, the invention has the following beneficial effects: in the invention, SF6 and N2 are respectively supplied through the upper air passage and the lower air passage in an initial state, are fed into the uniform mixing cavity for preliminary mixing, are supplied through split type air supply, are subjected to terminal mixing, prevent gas streaming, facilitate classification storage and are beneficial to ensuring air supply precision; when N2 circulates along a plurality of sectional paths of the lower air passage, the N2 enters the contraction section through the inlet section to be compressed through the change of the diameter, and enters the throat after the compression is finished, the pressure of the throat is reduced due to the reduction of the overflow section and the increase of the flow speed, negative pressure is formed in the guide passage, the guide passage is communicated with the upper air passage, so that part of SF6 enters the N2 to be premixed, after SF6 air supply is finished, the two ends of the upper air passage are simultaneously blocked through the two stop valves, residual SF6 gas in the upper air passage continuously enters the throat through the guide passage under the action of the negative pressure, the residual SF6 in a pipe is reduced, and the air distribution precision is improved; after the degassing is finished, the electromagnet is not electrified any more, the magnetism at the end part of the electromagnet disappears, the sealing plate is not adsorbed, N2 rushes into the upper air passage from the switching flow passage, SF6 gas participated in by negative pressure adsorption in the upper air passage is flushed, and is wrapped and clamped in the throat from the drainage passage and finally discharged into the uniform mixing cavity, so that SF6 gas output from the first storage tank can completely enter the inner cavity of the electric element, SF6 residual gas in the pipeline conveying process is avoided, and the final proportioning precision is influenced.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a schematic general construction of the present invention;
fig. 2 is a schematic diagram of an SF6, N2 layered delivery architecture of the present invention;
FIG. 3 is an enlarged view of part A of FIG. 2;
FIG. 4 is a schematic diagram of SF6 degassing structure of the present invention;
FIG. 5 is a schematic diagram of the SF6 flow path flushing configuration of the present invention;
FIG. 6 is an enlarged view of part B of FIG. 5;
FIG. 7 is an enlarged view of part C of FIG. 5;
In the figure: 1-carrier, 11-upper air flue, 12-lower air flue, 121-inlet section, 122-contraction section, 123-throat, 124-diffusion section, 125-guiding channel, 13-mixing cavity, 131-inner channel, 132-outer channel, 14-switching channel, 15-pressure sensing cavity, 2-guiding device, 21-sealing plate, 22-electromagnet, 23-cutting component, 231-pressure sensing diaphragm, 232-sensing rod, 233-sensing coil, 3-storage device, 31-first storage tank, 32-second storage tank, 33-cutting valve, 34-regulating valve and 4-electric element.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides the technical scheme that:
As shown in fig. 1-2, an SF6-N2 mixed gas filling device is used for filling mixed gas into an electrical component 4, the filling device comprises a carrier 1, a flow guiding device 2 and a storage device 3, the flow guiding device 2 is connected with the carrier 1, the storage device 3 is communicated with the carrier 1 through a pipeline, an upper air passage 11 and a lower air passage 12 are respectively arranged on the carrier 1, the storage device 3 comprises a first storage tank 31 and a second storage tank 32, the first storage tank 31 is communicated with the upper air passage 11 through a pipeline, the second storage tank 32 is communicated with the lower air passage 12 through a pipeline, and the flow guiding device 2 is used for switching gas flow paths.
The mixed gas is filled into the electric element 4 through the filling device, the electric element 4 is mainly high-voltage power equipment in electric and power industries, the electric element 4 is guaranteed to have good insulating property through the filled mixed gas, the first storage tank 31 is used for supplying SF6, the second storage tank 32 is used for supplying N2, the gas supply precision is improved through an up-down layered supply mode, the carrier 1 is used as a main installation base and used for carrying other devices, the carrier 1 can be of a box frame type design, wheels can be arranged at the bottom for improving mobility, portable design is carried out, the flow guiding device 2 is mainly used for carrying out flow path switching, and after SF6 gas supply is completed, the N2 is used for flushing the upper air passage 11, so that all the supplied SF6 is guaranteed to enter the electric element 4.
As shown in fig. 1-3, the storage device 3 further comprises two stop valves 33 and two regulating valves 34, the two stop valves 33 are respectively positioned at the inlet and outlet positions of the upper air passage 11, the regulating valves 34 are positioned at the inlet positions of the lower air passage 12, the carrier 1 is provided with a uniform mixing cavity 13, the tail ends of the upper air passage 11 and the lower air passage 12 are respectively communicated with the uniform mixing cavity 13, the electric element 4 is provided with a filling port, the uniform mixing cavity 13 is communicated with the filling port, the flow guiding device 2 comprises a sealing plate 21 and an electromagnet 22, the carrier 1 is provided with a switching flow passage 14, two ends of the switching flow passage 14 are respectively communicated with the upper air passage 11 and the lower air passage 12, the sealing plate 21 is rotationally connected with the upper end of the switching flow passage 14, the electromagnet 22 is arranged in the switching flow passage 14, and the sealing plate 21 is made of a magnet material;
When the power is on: the opposite ends of the electromagnet 22 and the sealing plate 21 are heteronymous magnetic poles;
Initial state: the shut-off valve 33 and the regulating valve 34 are both in an on state, the electromagnet 22 is in an energized state, and the switching flow passage 14 and the upper air passage 11 are in an off state.
The stop valve 33 is arranged at the inlet and outlet of the upper air passage 11, the two stop valves 33 are controlled in a linkage way, the two stop valves 33 are simultaneously conducted or cut off, the regulating valve 34 is used for controlling the instantaneous air inflow of the lower air passage 12, after SF6 and N2 air inflow is completed, the SF6 and N2 air inflow is guided into the uniform mixing cavity 13 to be mixed, and the SF6 and N2 air inflow are fed into the electric element 4 through the filling port, the electromagnet 22 is electrified, the displayed magnetic poles and the sealing plate 21 are heteronymous magnetic poles, namely, when the electromagnet 22 is electrified, the sealing plate 21 can be adsorbed, so that the upper end of the switching flow passage 14 is not conducted with the upper air passage 11, under the initial state, SF6 and N2 air inflow are respectively conducted through the upper air passage 11 and the lower air passage 12, the SF6 and N2 air inflow are fed into the uniform mixing cavity 13 to be primarily mixed, and are subjected to tail end mixing through split air inflow, so that the air stream is prevented, the classification storage is facilitated, and the air inflow precision is guaranteed.
As shown in fig. 4-5, the lower air flue 12 is sequentially provided with an inlet section 121, a contraction section 122, a throat 123 and a diffusion section 124 along the air flow conveying direction, the second storage tank 32 is communicated with the inlet section 121, the diffusion section 124 is communicated with the uniform mixing cavity 13, one side of the throat 123 is provided with a drainage channel 125, and one end of the drainage channel 125 far away from the throat 123 is communicated with the upper air flue 11;
Degassing: the two shut-off valves 33 are in the shut-off state.
The proportion of SF6 in SF6-N2 mixed gas is about 30%, N2 is more than SF6 gas amount, when N2 flows along a plurality of sectional paths of the lower air passage 12, through the change of diameter, the mixed gas enters the contraction section 122 through the inlet section 121 to compress, the mixed gas enters the throat 123 after compression, the pressure of the throat 123 is reduced due to the reduction of the overflow section and the increase of the flow speed, negative pressure is formed in the drainage channel 125, the drainage channel 125 is communicated with the upper air passage 11, part of SF6 enters the N2 to be premixed, after SF6 air supply is finished, the two ends of the upper air passage 11 are simultaneously cut off through the two stop valves 33, SF6 gas remained in the upper air passage 11 continuously enters the throat 123 through the drainage channel 125 under the action of negative pressure, SF6 allowance in a pipe is reduced, and air distribution accuracy is improved.
As shown in fig. 5 to 6, the diameter of the constriction section 122 is gradually decreased along the gas conveying direction, and the inlet of the switching flow passage 14 is positioned in the constriction section 122;
The scouring time is as follows: electromagnet 22 is de-energized and switching channel 14 is in communication with upper airway 11.
The diameter of the contraction section 122 is decreased progressively, the contraction section is used for compressing N2 gas, after degassing is completed, no power is supplied to the electromagnet 22, magnetism at the end part of the electromagnet 22 disappears, the sealing plate 21 is not adsorbed, N2 rushes into the upper air passage 11 from the switching flow passage 14, SF6 gas participated in through negative pressure adsorption in the upper air passage 11 is flushed, the SF6 gas is wrapped and clamped in the throat 123 from the drainage passage 125, and finally the SF6 gas is discharged into the uniform mixing cavity 13, so that SF6 gas output from the first storage tank 31 can completely enter the inner cavity of the electric element 4, and SF6 residual gas in the pipeline conveying process is avoided, and the final proportioning precision is influenced.
As shown in fig. 7, the mixing chamber 13 includes an inner flow path 131 and an outer flow path 132, the outlet of the upper air path 11 is directed toward the inner flow path 131, and the end of the diffuser 124 communicates with the outer flow path 132.
The diameter of the inner runner 131 is smaller, the SF6 flow rate is faster than the N2 flow rate in the outer runner 132, when SF6 flows out from the inner runner 131, the friction between gases is smaller, the friction between the N2 and the wall surface of the outer runner 132 is larger, and dragging flow is formed, so that SF6 has a trend of moving to N2, the diffusion mixing performance is improved, the gases entering the electric element 4 are in a mixed state, and the electric element can be used without waiting for mixing for a long time.
As shown in fig. 7, the flow guiding device 2 further includes a cutting component 23, the carrier 1 is provided with a pressure sensing cavity 15, the pressure sensing cavity 15 is located at one side of the mixing cavity 13, the cutting component 23 includes a pressure sensing membrane 231 and an induction coil 233, the pressure sensing membrane 231 is located at a joint of the pressure sensing cavity 15 and the mixing cavity 13, the induction coil 233 is disposed in the pressure sensing cavity 15, the pressure sensing membrane 231 extends upwards to be provided with an induction rod 232, and an upper end of the induction rod 232 extends into an inner ring of the induction coil 233.
Through setting up pressure sensing chamber 15 in samming chamber 13 one side, the interface department sets up pressure sensing diaphragm 231, after the mixed gas fills in electric element 4 finishes, can make the pressure increase in samming chamber 13, pressure sensing diaphragm 231 takes place deformation under the pressure effect, drive inductive lever 232 and remove, induction coil 233 is cutting magnetism induction line motion, and produce the induced current, when the induced current value that induction coil 233 produced reaches the standard value, accomplish in electric element 4 to fill, under the prerequisite of the complete entering electric element 4 of SF6 of first storage tank 31 output, when reaching predetermined pressure, the N2 of input is quantitative, thereby guarantee that mixed gas's filling is quantitative filling, and SF6 and N2 proportion are fixed, guarantee the filling precision.
Preferably, the sensing rod 232 and the sensing coil 233 form a sensing circuit that is electrically connected to the regulator valve 34. When the current collected by the induction coil 233 reaches the standard value, that is, when the mixed gas filled in the electric element 4 reaches the standard value, the air inlet valve at the inlet of the electric element 4 is closed, and the regulating valve 34 is controlled to close the N2 supplied by the second storage tank 32, so that the purpose of automatic stop after full filling is achieved.
Preferably, the axis of rotation of the seal plate 21 is located near the inlet side of the upper airway 11. The rotary axis of the sealing plate 21 is arranged at one side close to the inlet of the upper air passage 11, and in an initial state, after SF6 enters the upper air passage 11, the gas pressure can assist in bonding the electromagnet 22 and the sealing plate 21, so that the cut-off performance of the switching flow passage 14 and the upper air passage 11 is ensured.
The working principle of the invention is as follows: in the initial state, SF6 and N2 are respectively supplied through the upper air passage 11 and the lower air passage 12, are fed into the uniform mixing cavity 13 for preliminary mixing, are supplied through split type air supply, are subjected to terminal mixing, prevent gas streaming, facilitate classification storage, and are beneficial to guaranteeing air supply precision; when N2 circulates along a plurality of sectional paths of the lower air passage 12, the N2 enters the contraction section 122 through the inlet section 121 for compression through the change of the diameter, and enters the throat 123 after the compression is finished, the pressure of the throat 123 is reduced due to the reduction of the overflow section and the increase of the flow speed, negative pressure is formed in the drainage channel 125, the drainage channel 125 is communicated with the upper air passage 11, so that part of SF6 enters the N2 for premixing, after SF6 air supply is finished, the two ends of the upper air passage 11 are simultaneously blocked through the two stop valves 33, and residual SF6 gas in the upper air passage 11 continuously enters the throat 123 through the drainage channel 125 under the action of the negative pressure, so that the SF6 allowance in a pipe is reduced, and the air distribution precision is improved; after the degassing is finished, no power is supplied to the electromagnet 22, the magnetism at the end part of the electromagnet 22 disappears, the sealing plate 21 is not adsorbed, N2 rushes into the upper air passage 11 from the switching flow passage 14, SF6 gas participated in by negative pressure adsorption in the upper air passage 11 is flushed, and is wrapped in the SF6 gas entering the throat 123 from the drainage passage 125 and finally discharged into the uniform mixing cavity 13, so that SF6 gas output from the first storage tank 31 can completely enter the inner cavity of the electric element 4, and SF6 residual gas in the pipeline conveying process is avoided, and the final proportioning precision is influenced.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. SF6-N2 mixed gas fills device, fill device is used for filling mixed gas in electrical component (4), its characterized in that: the filling device comprises a carrier (1), a flow guiding device (2) and a storage device (3), wherein the flow guiding device (2) is connected with the carrier (1), the storage device (3) is communicated with the carrier (1) through a pipeline, an upper air passage (11) and a lower air passage (12) are respectively arranged on the carrier (1), the storage device (3) comprises a first storage tank (31) and a second storage tank (32), the first storage tank (31) is communicated with the upper air passage (11) through a pipeline, the second storage tank (32) is communicated with the lower air passage (12) through a pipeline, and the flow guiding device (2) is used for switching gas flow paths;
The storage device (3) further comprises stop valves (33) and regulating valves (34), the two stop valves (33) are arranged at the inlet and outlet positions of the upper air passage (11) respectively, the regulating valves (34) are arranged at the inlet positions of the lower air passage (12), the carrier (1) is provided with a uniform mixing cavity (13), the tail ends of the upper air passage (11) and the lower air passage (12) are respectively communicated with the uniform mixing cavity (13), the electric element (4) is provided with a filling port, the uniform mixing cavity (13) is communicated with the filling port, the flow guiding device (2) comprises a sealing plate (21) and an electromagnet (22), the carrier (1) is provided with a switching flow passage (14), the two ends of the switching flow passage (14) are respectively communicated with the upper air passage (11) and the lower air passage (12), the upper ends of the sealing plate (21) are rotationally connected with the upper ends of the switching flow passage (14), and the electromagnet (22) is arranged in the switching flow passage (14), and the sealing plate (21) is made of magnet material;
when the power is on: the opposite ends of the electromagnet (22) and the sealing plate (21) are different-name magnetic poles;
initial state: the stop valve (33) and the regulating valve (34) are both in an on state, the electromagnet (22) is in an energized state, and the switching flow passage (14) and the upper air passage (11) are in an off state.
2. The SF6-N2 gas mixture filling device of claim 1, wherein: the lower air passage (12) is sequentially provided with an inlet section (121), a contraction section (122), a throat (123) and a diffusion section (124) along the air flow conveying direction, the second storage tank (32) is communicated with the inlet section (121), the diffusion section (124) is communicated with the uniform mixing cavity (13), one side of the throat (123) is provided with a drainage passage (125), and one end of the drainage passage (125) far away from the throat (123) is communicated with the upper air passage (11);
degassing: the two shut-off valves (33) are in a shut-off state.
3. The SF6-N2 gas mixture filling device of claim 2, wherein: the diameter of the contraction section (122) is gradually reduced along the gas conveying direction, and the inlet of the switching flow passage (14) is positioned in the contraction section (122);
the scouring time is as follows: the electromagnet (22) is powered off, and the switching runner (14) is communicated with the upper air passage (11).
4. A SF6-N2 gas mixture filling device according to claim 3, wherein: the uniform mixing cavity (13) comprises an inner runner (131) and an outer runner (132), the outlet of the upper air passage (11) faces the inner runner (131), and the tail end of the diffusion section (124) is communicated with the outer runner (132).
5. The SF6-N2 gas mixture filling device of claim 4, wherein: the flow guiding device is characterized in that the flow guiding device (2) further comprises a cutting component (23), the carrier (1) is provided with a pressure sensing cavity (15), the pressure sensing cavity (15) is located on one side of the uniform mixing cavity (13), the cutting component (23) comprises a pressure sensing membrane (231) and an induction coil (233), the pressure sensing membrane (231) is located at the joint of the pressure sensing cavity (15) and the uniform mixing cavity (13), the induction coil (233) is arranged in the pressure sensing cavity (15), the induction rod (232) is arranged in an upward extending mode of the pressure sensing membrane (231), and the upper end of the induction rod (232) stretches into the inner ring of the induction coil (233).
6. The SF6-N2 gas mixture filling device of claim 5, wherein: the induction rod (232) and the induction coil (233) form a detection circuit, and the detection circuit is electrically connected with the regulating valve (34).
7. The SF6-N2 gas mixture filling device of claim 1, wherein: the axis of rotation of the sealing plate (21) is located near the inlet side of the upper air passage (11).
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