CN109737305B - Inflation device for sulfur hexafluoride and nitrogen mixed gas and operation method of inflation device - Google Patents
Inflation device for sulfur hexafluoride and nitrogen mixed gas and operation method of inflation device Download PDFInfo
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- 239000007789 gas Substances 0.000 title claims abstract description 283
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 45
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 229960000909 sulfur hexafluoride Drugs 0.000 title claims abstract description 30
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 36
- 238000001514 detection method Methods 0.000 claims abstract description 22
- 230000033228 biological regulation Effects 0.000 claims abstract description 19
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- 230000001105 regulatory effect Effects 0.000 claims description 2
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 3
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- 229910052799 carbon Inorganic materials 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
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- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
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Abstract
The invention discloses a sulfur hexafluoride and nitrogen mixed gas inflation device and an operation method thereof, wherein the inflation device comprises the following steps: four ports of the four-way valve group are respectively communicated with an inflation unit, a cavity of the electric power equipment to be inflated, a gas state parameter detection unit and a gas uniform buffer unit; the inflation unit includes: SF6Gas distribution branch, N2The gas distribution branch circuit and the feedback control adjusting module; SF6Gas distribution branch and N2The air outlets of the air distribution branches are respectively communicated with the air inlets of the feedback control and regulation modules; SF6Gas distribution branch and N2The gas distribution branches comprise gas storage bottles, pressure reducing valves, barometers and gas flow control valves; the gas state parameter detection unit is used for detecting the gas pressure and the mixing ratio of mixed gas in the cavity of the electric power equipment to be inflated; the gas uniform buffer unit comprises a compressor and a buffer tank. The invention provides a portable inflator, which has higher mixing ratio control precision and can reduce the time required for uniformly mixing mixed gas.
Description
Technical Field
The invention belongs to the technical field of mixed gas inflation, and particularly relates to an inflation device for sulfur hexafluoride and nitrogen mixed gas and an operation method of the inflation device.
Background
SF6The gas is strong electronegative gas, and the molecules of the gas have strong capability of adsorbing free electrons to form negative ions, so the electric strength of the gas is very high, and is about 2.5 times of the electric strength of air in a relatively uniform electric field. SF6The boiling point of (A) is relatively high, and SF does not need to be worried about in most engineering application cases6The problem of liquefaction of the gas. Pure SF6The gas is a colorless, odorless, nontoxic and noncombustible inert gas, and has compatibility with materials in electrical equipment at a temperature below 180 ℃ and nitrogen. SF6The most important advantage of (A) is that it contains no carbon, so that carbon particles which affect the insulating properties are not decomposed; and the insulating property of most of the gaseous decomposition products and SF6Rather, decomposition does not degrade the gas insulation performance; so far, SF6Gases are the most desirable insulating and arc-extinguishing medium.
However, the greenhouse effect of sulfur hexafluoride gas is 2.2 ten thousand times that of carbon dioxide, which is one of 6 greenhouse gases prohibited from being emitted in the kyoto protocol, and thus strict control is required during the use process. In order to meet new international environmental protection requirements and reduce greenhouse gas emission, mixed insulating gas is adopted to replace pure sulfur hexafluoride insulating gas at home and abroad, so that the consumption of the sulfur hexafluoride gas is reduced.
At home and abroad about SF6SF is the most studied gas mixture6/N2、SF6/CO2、SF6Air and SF6/CF4And (4) mixing the gases. SF6/N2The power equipment using mixed gas as insulating medium is partially applied to practical engineering, and the first SF in the world6/N2The mixed gas insulated transmission line was put into operation at the international airport of geneva, switzerland in the early part of this century, where SF was contained in the insulating gas6The content is only 20 percent, thereby reducing the influence on the environment and greatly reducing the construction cost of GIL. France electric company and ABB company collaborate to develop SF for long distance6/N2The mixed gas GIL replaces the overhead transmission line of 420kV in the country. The Sian traffic university develops SF in sequence by cooperating with domestic manufacturers6Mixed gas insulated transformer, capacitor, and switchgear, but SF6The content of the mixed gas is at least 85%. Currently, there is no SF target6Gas insulated power equipment SF6/N2A portable mixed gas inflating device required by gas mixing field reconstruction. The existing mixed gas aerating device adopts the mass flow method principle, controls the gas mass flow ratio by a gas flowmeter, calculates the gas mass ratio as the ratio of molar concentration by an industrial personal computer unit, and controls the gas mixing ratio. Before use, it is usually necessary to set the inflation volume and the inflation gas into the buffer chamber for mixing. However, since the total amount of the mixed gas filled in the cavity of the current transformer cannot be known in advance, premixing in the buffer cavity cannot be performed, and the difficulty in accurately controlling the proportion of the mixed gas and the accuracy of the pressure is high; in addition, the existing mixed gas charging device has large volume and is difficult to meet the requirements of portability, rapidness and accuracy for filling required by field reconstruction.
In summary, it is of great practical significance to develop a portable mixed gas inflator for use in gas insulated power equipment.
Disclosure of Invention
The present invention is directed to a sulfur hexafluoride and nitrogen mixed gas inflator and a method of operating the same to address one or more of the above-identified problems. The invention provides a portable inflator, which has higher mixing ratio control precision and can reduce the time required for uniformly mixing mixed gas.
In order to achieve the purpose, the invention adopts the following technical scheme:
a device for inflating a mixed gas of sulfur hexafluoride and nitrogen, comprising: the gas-filling device comprises an inflation unit, a four-way valve group, a gas state parameter detection unit and a gas uniform buffer unit; four ports of the four-way valve group are respectively communicated with an inflation unit, a cavity of the electric power equipment to be inflated, a gas state parameter detection unit and a gas uniform buffer unit; the inflation unit includes: SF6Gas distribution branch, N2The gas distribution branch circuit and the feedback control adjusting module; SF6Gas distribution branch and N2The air outlet of the air distribution branch is respectively communicated with the air inlet of the feedback control and regulation module, and the air outlet of the feedback control and regulation module is used as the air outlet of the inflation unit; SF6Gas distribution branch and N2The gas distribution branches comprise gas storage bottles, pressure reducing valves, barometers and gas flow control valves; the gas state parameter detection unit is used for detecting the gas pressure and the mixing ratio of mixed gas in the cavity of the electric power equipment to be inflated; the gas uniform buffer unit comprises a compressor and a buffer tank and is used for pumping mixed gas in the cavity of the electric power equipment to be inflated into the buffer tank and sending the mixed gas into the cavity of the electric power equipment to be inflated again after uniform mixing.
The invention is further improved in that the four-way valve group comprises four ports; the gas outlet of the gas charging unit is communicated with the first port of the four-way valve group, the gas inlet of the gas state parameter detection unit is communicated with the second port of the four-way valve group, the third port of the four-way valve group is communicated with the gas inlet of the cavity of the power equipment to be charged, and the gas uniform buffer unit is communicated with the fourth port of the four-way valve group; and each port of the four-way valve group is provided with a switch valve.
In a further development of the invention, the inflation cells contain SF6The distribution branch specifically includes: SF6A gas cylinder; SF6The gas outlet of the gas bottle is communicated with the gas inlet of the feedback control and regulation module through a first gas distribution pipeline, and a pressure reducing valve, a barometer and a gas flow control valve are sequentially arranged on the first gas distribution pipeline along the gas flowing direction; charging deviceIn gas unit N2The distribution branch specifically includes: n is a radical of2A gas cylinder; n is a radical of2The gas outlet of the gas cylinder is communicated with the gas inlet of the feedback control adjusting module through a second gas distribution pipeline, and a pressure reducing valve, a barometer and a gas flow control valve are sequentially arranged on the second gas distribution pipeline along the gas flowing direction.
A further development of the invention consists in that the gas state parameter detection unit comprises:
the pressure monitoring and detecting module is used for detecting the pressure of mixed gas in the cavity of the electric power equipment to be inflated in real time;
and the mixing ratio monitoring and detecting module is used for detecting the mixing ratio of the mixed gas in the cavity of the electric equipment to be inflated in real time.
A further improvement of the present invention resides in that the gas uniforming buffer unit includes: the air conditioner comprises a compressor, a first main pipeline, a second main pipeline, a buffer tank, a first bypass air passage and a second bypass air passage; the compressor is communicated with the four-way valve group through a first main pipeline and is communicated with the buffer tank through a second main pipeline; a first switch valve and a second switch valve are arranged on the first main pipeline, and the second switch valve is positioned between the first switch valve and the compressor; a third switch valve is arranged on the second main pipeline; the first main pipeline is communicated with the second main pipeline through a first bypass gas circuit, and a fourth switch valve is arranged on the first bypass gas circuit; one port of the first bypass air passage is communicated with a first main pipeline between the first switch valve and the second switch valve, and the other port of the first bypass air passage is communicated with a second main pipeline between the compressor and the third switch valve; the first main pipeline is communicated with the buffer tank through a second bypass air path, a fifth switch valve is arranged on the second bypass air path, one port of the second bypass air path is communicated with the buffer tank, and the other port of the second bypass air path is communicated with the first main pipeline between the second switch valve and the compressor.
The invention further improves the method and also comprises the following steps: a vacuum pumping unit;
the vacuumizing unit comprises a pump set and a vacuumizing pipeline;
the pumping hole of the pump set is communicated with one end of a vacuumizing pipeline, and the other end of the vacuumizing pipeline is communicated with a pipeline between the port of the four-way valve and the first switch valve through a switch valve.
The invention is further improved in that the feedback control and regulation module comprises a pressure transmitter and a flow control module; the signal output end of the pressure transmitter is connected with the signal receiving end of the flow control module, and the flow control module comprises a multi-gear electromagnetic valve and a signal comparison circuit; the pressure transmitter is used for detecting air pressure, converting an air pressure value into a digital signal and transmitting the digital signal to the flow control module; the digital signals are processed by the signal comparison circuit, and when the digital signals reach the set signal threshold value of each gear of the multi-gear electromagnetic valve, the gear of the electromagnetic valve is triggered to be adjusted, so that the flow of the inflation pipeline is adjusted.
The operation method of the inflation device for the sulfur hexafluoride and nitrogen mixed gas comprises the following steps of:
opening of SF6Gas flow control valve of gas distribution branch so as to enable SF6The distribution branch is communicated with the four-way valve group through a feedback control adjusting module to perform SF on the cavity of the power equipment6Inflating; SF6A barometer of the gas distribution branch monitors the gas pressure in the cavity in real time; when SF6When the air pressure reaches 50% of the preset partial pressure, the flow of the gas flow control valve is controlled to be 50% through the feedback control adjusting module, and when SF (sulfur hexafluoride) is detected6When the air pressure reaches 75% of the preset partial pressure, the flow rate of the gas flow control valve is controlled to be 25% through the feedback control adjusting module, and when SF (sulfur hexafluoride) is used6When the air pressure reaches 90% of the preset partial pressure, the flow of the gas flow control valve is controlled to be 10% through the feedback control adjusting module until SF6Completing inflation;
shut down of SF6Opening the gas flow control valve of the gas distribution branch2Gas flow control valve of gas distribution branch so that N2The distribution branch is communicated with the four-way valve group through the feedback control adjusting module to carry out N on the cavity of the power equipment2Inflating; n is a radical of2A barometer of the gas distribution branch monitors the gas pressure in the cavity of the power equipment in real time; when the air pressure reaches 50% of the preset air pressure, the flow of the gas flow control valve is controlled to be 50% by the feedback control adjusting module, and when the air pressure reaches 75% of the preset air pressure, the gas is controlled by the feedback control adjusting moduleThe flow rate of the flow control valve is 25 percent, when the air pressure reaches 90 percent of the preset air pressure, the flow rate of the gas flow control valve is controlled to be 10 percent through the feedback control adjusting module until N is reached2Completing inflation;
and obtaining sulfur hexafluoride and nitrogen mixed gas with preset air pressure and mixing ratio in the cavity of the electrical equipment to be inflated.
The specific steps of controlling the gas flow through the feedback control and regulation module comprise: the feedback control and regulation module comprises a pressure transmitter and a flow control module; detecting air pressure through a pressure transmitter, converting an air pressure value into a digital signal, and transmitting the digital signal to a flow control module; the flow control module comprises a multi-gear electromagnetic valve and a signal comparison circuit, received digital signals are processed through the signal comparison circuit, when signal threshold values are set at all gears of the multi-gear electromagnetic valve, gear adjustment of the electromagnetic valve is triggered, and flow adjustment of the inflation pipeline is achieved.
Compared with the prior art, the invention has the following beneficial effects:
according to the inflation device, the partial pressure control principle is utilized, the mixing ratio control is controlled through the partial pressure of each component gas, the pressure value of each component gas and the pressure value of the gas in the current transformer are monitored in real time by using the pressure sensor, the device is very intuitive, the feedback control and adjustment can be carried out according to the final pressure, and the mixing ratio and the pressure can be accurately controlled; the invention relates to a portable inflating device, which adopts a pressure detection control method to control the mixing ratio of mixed gas, does not need to preset the total inflating volume, can more conveniently expand the application range, has smaller volume and is convenient for field use. According to the invention, the cavity of the inflatable power equipment is used as a primary buffer cavity, and mixed gas is obtained by direct filling; after the inflation is finished, the secondary buffer cavity is utilized to further fully mix the gas, so that the time for uniformly mixing the mixed gas can be greatly shortened.
Drawings
Fig. 1 is a schematic block diagram of a connection structure of a portable inflation device for sulfur hexafluoride and nitrogen mixed gas according to an embodiment of the present invention;
fig. 2 is a schematic view of a connection structure of a four-way valve block in a portable inflation device for sulfur hexafluoride and nitrogen mixed gas according to an embodiment of the invention;
FIG. 3 is a schematic block diagram of a connection structure of an inflation unit in a portable inflation device for sulfur hexafluoride and nitrogen mixed gas according to an embodiment of the present invention;
fig. 4 is a schematic connection block diagram of a gas uniform buffer unit in a portable inflation device for sulfur hexafluoride and nitrogen mixed gas according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
Referring to fig. 1, the portable inflation device for sulfur hexafluoride and nitrogen mixed gas of the present invention mainly includes: the gas-filling device comprises an inflation unit, a four-way valve group, a gas state parameter detection unit and a gas uniform buffer unit.
Referring to fig. 1 and 2, the four-way valve set is mainly used for communicating the inflation unit, the cavity of the power equipment to be inflated, the gas state parameter detection unit and the gas uniform buffer unit. The gas outlet end of the gas filling unit is communicated with the first port of the four-way valve group, the gas inlet end of the mixed gas monitoring and detecting unit is communicated with the second port of the four-way valve group, the third port of the four-way valve group is communicated with the gas inlet end of the cavity of the power equipment to be filled, and the gas uniform buffer unit is communicated with the fourth port of the four-way valve group. And each port of the four-way valve group is provided with a switch valve. The four-way valve structure is similar to the Shiwecker swagelok (SS-6M0-4) structure. In the invention, due to the consideration of volume and air pressure strength, the pipeline is convenient to bend and connect, the installation arrangement of other parts in the inflating device is adapted, and the position of the port of the four-way valve is adaptively adjusted. In addition, the mechanical strength of the four-way valve is also enhanced in consideration of the strength and reliability of the device.
Referring to fig. 1 and 3, the inflation unit mainly includes: SF6Gas distribution branch, N2The system comprises a gas distribution branch and a feedback control adjusting module. SF6The gas distribution branch comprises SF6Gas cylinder, pressure reducing valve, gas pressure gauge, gas flow control valve, N2Gas distribution branch N2Gas cylinder, relief pressure valve, barometer and gas flow control valve. The gas flow control valves of the two branches are connected with the first port of the four-way valve through a feedback control adjusting module. Specifically, SF6The gas cylinder is communicated with the feedback control and regulation module through a first pipeline, and a pressure reducing valve, a barometer and a gas flow control valve are sequentially arranged on the first pipeline; n is a radical of2The gas cylinder is communicated with the feedback control and regulation module through a second pipeline, and a pressure reducing valve, a barometer and a gas flow control valve are sequentially arranged on the second pipeline; and the port of the feedback control unit is used as the outlet of the inflation unit and is communicated with the subsequent four-way valve group.
The feedback regulation module mainly comprises a pressure transmitter, a temperature sensor and a signal processing unit (developed by a singlechip). The pressure transmitter converts the air pressure signal into a digital signal, and the temperature sensor monitors the ambient temperature in real time to compensate the air pressure signal monitoring result. The compensation calculation is carried out in the signal processing unit, and the final result is fed back to the flow control unit to realize the gear adjustment of the flow control and the inflation speed. For example, in the feedback control regulation module, a pressure transmitter (similar to KZY-K0-H, Beijing Kunlun) is used for detecting the air pressure, and the air pressure value is converted into a digital signal and transmitted to the flow control module. The flow control module comprises a multi-gear electromagnetic valve and a signal comparison circuit. The digital signal output by the pressure transmitter is processed by the signal comparison circuit, and when the digital signal reaches the set signal threshold value of each gear of the multi-gear electromagnetic valve, the gear adjustment of the electromagnetic valve is triggered, so that the flow adjustment of the inflation pipeline is realized.
Referring to fig. 1, the gas state parameter detecting unit includes: the device comprises a current transformer gas pressure monitoring and detecting module and a mixing ratio monitoring and detecting module.
The gas state parameter detection unit mainly comprises a gas pressure monitoring detection module and a mixing ratio monitoring detection module. The air pressure detection module comprises an SF6/N2 mixed gas density meter, has the functions of temperature compensation and parameter remote transmission, and can monitor the air pressure of the mixed gas in the equipment cavity in real time and transmit and display the air pressure on an interface of the device; the pressure monitoring and detecting module comprises a pressure transmitter (KZY-K0-H, Beijing Kunlun) and a temperature sensor (KZW-JPT-A, Beijing Kunlun), the temperature sensor is used for measuring the temperature, and the pressure result measured by the pressure transmitter is subjected to real-time temperature compensation to be used as the final actual detection result. The mixing ratio detection device can detect the mixing ratio in the cavity in real time, and can select an FV3320 online chromatographic monitor of Shanghai Vanwei.
Referring to fig. 1 and 4, the gas uniforming buffer unit includes: the air compressor, the inflation and air exhaust switching pipeline and the high-pressure buffer tank. After the cavity of the power equipment is filled with air, in order to shorten the time for uniformly mixing and standing the mixed gas in the cavity, the mixed gas is mixed in an accelerating way by utilizing the buffer module.
And a fourth port of the four-way valve is connected with a buffer module gas main pipeline, and a first switch valve and a second switch valve are sequentially arranged on the buffer module gas main pipeline. The main pipeline is connected with an air inlet of the compressor. The outlet of the compressor is connected with the pipeline and is connected with the buffer cavity through a third switch valve. In order to change the gas flow direction, a first bypass gas path is designed between the first switch valve and the second switch valve and between the compressor and the third switch valve, and a fourth switch valve is arranged on the gas path; and a second bypass gas path is designed between the second switch valve and the inlet of the compressor and on the buffer cavity, and a fifth switch valve is installed on the gas path.
The high-pressure buffer tank is mainly used for carrying out secondary mixing on mixed gas filled into the cavity of the power equipment, and the time for obtaining uniform mixed gas is shortened.
The working process of the gas uniform buffer unit is as follows: firstly, opening a first switch valve, a second switch valve and a third switch valve, compressing gas in an equipment cavity into a buffer cavity by using a compressor, closing the second switch valve and the third switch valve after the pressure in the buffer cavity reaches a preset pressure value, standing for a period of time, opening a fourth switch valve and a fifth switch valve, and refilling the buffered gas into the equipment cavity by using the compressor again; repeated operation and change for several times, and uniform mixing of the gas in the cavity of the accelerating equipment.
The device of the invention is also integrated with a vacuum pumping unit; the vacuumizing unit comprises a double-stage rotary vane vacuum pump (Shaanxi Exxon) and an air suction pipeline. The air pumping port of the vacuum pump is connected with one port of an air pumping pipeline, and the other port of the air pumping pipeline is connected with a pipeline between the port of the four-way valve and the first switch valve through a switch valve. The pressure transmitter and the temperature sensor are respectively arranged on the air extraction pipeline. The vacuumizing unit is mainly used for evacuating residual air in the inflating device before the inflating device is filled with mixed gas. Specifically, before inflation, the SF6/N2 inflation branch relief valve is closed, and all remaining on-off valves are opened. And opening the vacuum pump, and vacuumizing the pipeline and the cavity. And when the vacuum degree reaches a preset value, closing all the valves and closing the vacuum pump. And carrying out inflation operation.
The invention relates to an operation method of a portable inflation device for sulfur hexafluoride and nitrogen mixed gas, which specifically comprises the following steps:
when the air charging device is used for charging air, high-purity SF is firstly charged6With high purity N2Are respectively connected with the gas distribution pipeline. The air charging rate in the air distribution process can be flexibly adjusted by utilizing the pressure reducing valve. Due to SF6Density greater than N2Density, to obtain better initial mixing effect, SF is first charged6A gas. Opening of SF6Gas flow control valve of gas distribution branch so as to enable SF6The air passage is communicated with the four-way valve through the feedback control module for inflation. SF6The gas is directly filled into the cavity of the power equipment, and the gas pressure in the cavity is monitored by a barometer (xi' an Huawei) in real time.
When SF6When the air pressure reaches 50% of the preset partial pressure, the feedback control and regulation unit controls the flow of the gas flow control valve to be 50% of the flow, and when SF (sulfur hexafluoride) is detected6When the air pressure reaches 75% of the preset partial pressure, the feedback adjusting unit adjusts the flow of the gas flow control valve to be 25% of the flow, and when the partial pressure reaches 90% of the preset value, the flow is set to be 10%. Accurate partial pressure can be achieved by utilizing the feedback control adjusting module and the gas flow control valve unit.
SF6After the pure gas is finished, the SF is closed6Bypass flow control valve, open N2By-pass flow control valves, so that N2The charging pipeline is communicated with the feedback adjusting module and the four-way valve to start charging N2. Real-time monitoring power equipment of barometerThe gas pressure in the cavity. When the air pressure reaches 50% of the preset air pressure, the feedback control adjusting unit controls the flow of the gas flow control valve to be 50% of the flow, when the air pressure reaches 75% of the preset air pressure, the feedback adjusting unit adjusts the flow of the gas flow control valve to be 25% of the flow, and when the air pressure reaches 90% of the preset air pressure, the flow is set to be 10% of the flow until the air inflation is finished. And finally, mixed gas with preset gas pressure and mixing ratio is obtained in the cavity of the gas insulated power equipment.
Wherein, the regulation of atmospheric pressure and flow does: the pressure signal is detected by a pressure transmitter in the feedback control and regulation unit; the preset voltage division is stored in the flow regulating module, and a threshold value in the signal comparison circuit is used for comparison. When this preset threshold is reached, the flow control valve is shifted to effect flow regulation.
After the inflation process is completed, the buffer tank unit buffer pipeline is opened, and the mixed gas in the equipment enters the high-pressure gas cylinder through the buffer tank pipeline and the compressor. And when the gas in the equipment cavity is completely transferred into the buffer tank, closing the valve of the buffer pipeline. And opening the valve of the gas charging pipeline, and at the moment, the mixed gas in the buffer tank enters the cavity of the equipment again through the gas charging pipeline and the compressor. The inflation buffering process is repeated for several times, so that the gas is uniformly mixed.
In summary, aiming at the defects of the prior art, the invention provides a portable inflation device, which utilizes a partial pressure control principle, controls the mixing ratio control through the partial pressure of each component gas, utilizes a pressure sensor to monitor the pressure value of each component gas and the pressure value of the gas in a current transformer in real time, is very intuitive, can perform feedback control adjustment according to the final pressure, and can accurately control the mixing gas ratio and pressure; the invention relates to a portable inflating device, which adopts a pressure detection control method to control the mixing ratio of mixed gas, does not need to preset the total inflating volume, can more conveniently expand the application range, has smaller volume and is convenient for field use. According to the invention, the cavity of the inflatable power equipment is used as a primary buffer cavity, and mixed gas is obtained by direct filling; after the inflation is finished, the secondary buffer cavity is utilized to further fully mix the gas, so that the time for uniformly mixing the mixed gas can be greatly shortened.
Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.
Claims (7)
1. The utility model provides a sulfur hexafluoride and nitrogen gas mist's aerating device which characterized in that includes: the gas-filling device comprises an inflation unit, a four-way valve group, a gas state parameter detection unit and a gas uniform buffer unit;
four ports of the four-way valve group are respectively communicated with an inflation unit, a cavity of the electric power equipment to be inflated, a gas state parameter detection unit and a gas uniform buffer unit;
the inflation unit includes: SF6Gas distribution branch, N2The gas distribution branch circuit and the feedback control adjusting module; SF6Gas distribution branch and N2The air outlet of the air distribution branch is respectively communicated with the air inlet of the feedback control and regulation module, and the air outlet of the feedback control and regulation module is used as the air outlet of the inflation unit; SF6Gas distribution branch and N2The gas distribution branches comprise gas storage bottles, pressure reducing valves, barometers and gas flow control valves;
the gas state parameter detection unit is used for detecting the gas pressure and the mixing ratio of mixed gas in the cavity of the electric power equipment to be inflated;
the gas uniform buffer unit comprises a compressor and a buffer tank and is used for pumping the mixed gas in the cavity of the electric power equipment to be inflated into the buffer tank, and sending the mixed gas into the cavity of the electric power equipment to be inflated again after uniform mixing;
SF in the gas cell6The distribution branch specifically includes: SF6A gas cylinder; SF6The gas outlet of the gas bottle is communicated with the gas inlet of the feedback control and regulation module through a first gas distribution pipeline, and a pressure reducing valve, a barometer and a gas flow control valve are sequentially arranged on the first gas distribution pipeline along the gas flowing direction;
in the inflatable cell N2The distribution branch specifically includes: n is a radical of2A gas cylinder; n is a radical of2The gas outlet of the gas bottle is communicated with the gas inlet of the feedback control regulating module through a second gas distribution pipeline, and a pressure reducing valve, a barometer and a gas flow control valve are sequentially arranged on the second gas distribution pipeline along the gas flowing direction;
the gas state parameter detection unit includes:
the pressure monitoring and detecting module is used for detecting the pressure of mixed gas in the cavity of the electric power equipment to be inflated in real time;
and the mixing ratio monitoring and detecting module is used for detecting the mixing ratio of the mixed gas in the cavity of the electric equipment to be inflated in real time.
2. The inflation device for sulfur hexafluoride and nitrogen mixed gas of claim 1, wherein the four-way valve set includes four ports;
the gas outlet of the gas charging unit is communicated with the first port of the four-way valve group, the gas inlet of the gas state parameter detection unit is communicated with the second port of the four-way valve group, the third port of the four-way valve group is communicated with the gas inlet of the cavity of the power equipment to be charged, and the gas uniform buffer unit is communicated with the fourth port of the four-way valve group; and each port of the four-way valve group is provided with a switch valve.
3. The apparatus for inflating a mixed gas of sulfur hexafluoride and nitrogen as claimed in claim 1, wherein the gas homogenizing buffer unit includes: the air conditioner comprises a compressor, a first main pipeline, a second main pipeline, a buffer tank, a first bypass air passage and a second bypass air passage;
the compressor is communicated with the four-way valve group through a first main pipeline and is communicated with the buffer tank through a second main pipeline; a first switch valve and a second switch valve are arranged on the first main pipeline, and the second switch valve is positioned between the first switch valve and the compressor; a third switch valve is arranged on the second main pipeline; the first main pipeline is communicated with the second main pipeline through a first bypass gas circuit, and a fourth switch valve is arranged on the first bypass gas circuit; one port of the first bypass air passage is communicated with a first main pipeline between the first switch valve and the second switch valve, and the other port of the first bypass air passage is communicated with a second main pipeline between the compressor and the third switch valve; the first main pipeline is communicated with the buffer tank through a second bypass air path, a fifth switch valve is arranged on the second bypass air path, one port of the second bypass air path is communicated with the buffer tank, and the other port of the second bypass air path is communicated with the first main pipeline between the second switch valve and the compressor.
4. The apparatus for inflating a sulfur hexafluoride and nitrogen mixed gas as recited in claim 3, further comprising: a vacuum pumping unit;
the vacuumizing unit comprises a pump set and a vacuumizing pipeline;
the pumping hole of the pump set is communicated with one end of a vacuumizing pipeline, and the other end of the vacuumizing pipeline is communicated with a pipeline between the port of the four-way valve and the first switch valve through a switch valve.
5. The apparatus for aerating a sulfur hexafluoride and nitrogen mixed gas as recited in claim 1,
the feedback control and regulation module comprises a pressure transmitter and a flow control module; the signal output end of the pressure transmitter is connected with the signal receiving end of the flow control module, and the flow control module comprises a multi-gear electromagnetic valve and a signal comparison circuit; the pressure transmitter is used for detecting air pressure, converting an air pressure value into a digital signal and transmitting the digital signal to the flow control module; the digital signals are processed by the signal comparison circuit, and when the digital signals reach the set signal threshold value of each gear of the multi-gear electromagnetic valve, the gear of the electromagnetic valve is triggered to be adjusted, so that the flow of the inflation pipeline is adjusted.
6. The operating method of a sulfur hexafluoride and nitrogen mixed gas inflator according to claim 1, including the steps of:
opening of SF6Gas flow control valve of gas distribution branch so as to enable SF6The distribution branch is communicated with the four-way valve group through a feedback control adjusting module to perform SF on the cavity of the power equipment6Inflating; SF6A barometer of the gas distribution branch monitors the gas pressure in the cavity in real time; when SF6When the air pressure reaches 50% of the preset partial pressure, the flow of the gas flow control valve is controlled to be 50% through the feedback control adjusting module, and when SF (sulfur hexafluoride) is detected6When the air pressure reaches 75% of the preset partial pressure, the flow rate of the gas flow control valve is controlled to be 25% through the feedback control adjusting module, and when SF (sulfur hexafluoride) is used6When the air pressure reaches 90% of the preset partial pressure, the flow of the gas flow control valve is controlled to be 10% through the feedback control adjusting module until SF6Completing inflation;
shut down of SF6Opening the gas flow control valve of the gas distribution branch2Gas flow control valve of gas distribution branch so that N2The distribution branch is communicated with the four-way valve group through the feedback control adjusting module to carry out N on the cavity of the power equipment2Inflating; n is a radical of2A barometer of the gas distribution branch monitors the gas pressure in the cavity of the power equipment in real time; when the air pressure reaches 50% of the preset air pressure, the flow rate of the gas flow control valve is controlled to be 50% through the feedback control adjusting module, when the air pressure reaches 75% of the preset air pressure, the flow rate of the gas flow control valve is controlled to be 25% through the feedback control adjusting module, when the air pressure reaches 90% of the preset air pressure, the flow rate of the gas flow control valve is controlled to be 10% through the feedback control adjusting module until N is reached2Completing inflation;
and obtaining sulfur hexafluoride and nitrogen mixed gas with preset air pressure and mixing ratio in the cavity of the electrical equipment to be inflated.
7. The operating method of a sulfur hexafluoride and nitrogen mixed gas inflator according to claim 6, wherein the specific steps of controlling the gas flow rate through the feedback control adjustment module include: the feedback control and regulation module comprises a pressure transmitter and a flow control module; detecting air pressure through a pressure transmitter, converting an air pressure value into a digital signal, and transmitting the digital signal to a flow control module; the flow control module comprises a multi-gear electromagnetic valve and a signal comparison circuit, received digital signals are processed through the signal comparison circuit, when signal threshold values are set at all gears of the multi-gear electromagnetic valve, gear adjustment of the electromagnetic valve is triggered, and flow adjustment of the inflation pipeline is achieved.
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| CN110410672B (en) * | 2019-07-05 | 2021-08-10 | 中国科学院空间应用工程与技术中心 | Nitrogen supply method and device |
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| CN110314565B (en) * | 2019-08-07 | 2024-03-15 | 国网安徽省电力有限公司电力科学研究院 | Multifunctional C 4 F 7 N/CO 2 Mixed gas distribution system and method |
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| CN113262714A (en) * | 2021-05-19 | 2021-08-17 | 核工业理化工程研究院 | Bromine trifluoride and load gas batching method and device |
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