CN218412439U - SF 6 /N 2 Mixed gas purity detection system - Google Patents
SF 6 /N 2 Mixed gas purity detection system Download PDFInfo
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- CN218412439U CN218412439U CN202222220399.7U CN202222220399U CN218412439U CN 218412439 U CN218412439 U CN 218412439U CN 202222220399 U CN202222220399 U CN 202222220399U CN 218412439 U CN218412439 U CN 218412439U
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Abstract
SF 6 /N 2 A mixed gas purity detection system belongs to the technical field of mixed gas concentration detection equipment. The method is characterized in that: the gas outlet of the pressure stabilizing assembly is communicated with the gas inlet of the constant-temperature detection module through the gas circuit switching assembly, the gas outlet of the constant-temperature detection module is communicated with the gas inlet of the mass flow meter (9), and the gas inlet and the gas outlet of the oxygen concentration detection module are communicated with the gas circuit switching assembly. The SF 6 /N 2 The mixed gas purity detection system can respectively detect O 2 Concentration, SF 6 Concentration and N 2 The concentration can be detected, and the mixed gas can directly enter the constant-temperature detection module without passing through the oxygen concentration detection module, so that only the mixed gas is detectedFor SF in mixed gas 6 Concentration and N 2 Concentration detects, avoids oxygen concentration detection module to leak in the air and influence oxygen concentration detection module's life by force, and the detection of concentration can not receive the influence of air, and the degree of accuracy that detects is high, and convenient operation when detecting.
Description
Technical Field
SF 6 /N 2 A mixed gas purity detection system belongs to the technical field of mixed gas concentration detection equipment.
Background
SF since the beginning of the 20 th century in the 60' s 6 Gas is beginning to be applied to the field of electric power by virtue of the advantages of high voltage resistance, strong arc extinguishing capability and the like, and is widely applied to high-voltage, extra-high voltage and extra-high voltage power transmission and distribution systems. SF 6 Gas is easily liquefied at low temperature, the dielectric strength is reduced, the price is high, the gas is sensitive to a locally uneven electric field, and simultaneously, SF 6 Is also a strong greenhouse gas, and CO 2 Gas phase comparison, equivalent SF 6 The greenhouse effect of the gas is equivalent to that of CO 2 23900 times of gas, especially SF 6 Toxic gases are easily decomposed under the action of the electric arc, and the method poses a great threat to the safe operation of power equipment and the health of maintenance personnel. Therefore, an alternative SF is sought 6 Gas or partial replacement of SF 6 Has become one of the hot problems of domestic and foreign research. For scholars at home and abroad to SF 6 The results of the mixed gas study show that SF 6 And a non-electronegative gas N with stable chemical properties and low price 2 The formed binary mixed gas not only reduces the cost, but also reduces the SF 6 The sensitivity of gas to local electric field distortion and the solution of SF 6 The liquefaction of the gas has wide industrial application prospect. China new northeast electric pair 550KVSF 6 /N 2 The research on the insulating property of the mixed gas bus is SF 6 /N 2 The application of the mixed gas lays a solid foundation. At present, the domestic use of SF is gradually carried out on conventional and extra-high voltage equipment 6 /N 2 Mixed gas to replace SF 6 Gas, however, contains SF in practical application 6 /N 2 The electrical equipment of the mixed gas has micro-emptyGas infiltration (mainly considering N) 2 And O 2 ) Thus to SF in the mixed gas 6 /N 2 Concentration and trace amount of O 2 The detection of the concentration becomes particularly important. But at present the SF in the mixed gas 6 /N 2 Concentration and trace amount of O 2 The concentration can only be detected by different systems, and the existing systems cannot simultaneously meet the requirement of SF 6 /N 2 Concentration and trace amount of O 2 Detection of concentration, resulting in SF 6 /N 2 Concentration and trace amount of O 2 The concentration detection operation of the concentration is complicated.
Disclosure of Invention
The to-be-solved technical problem of the utility model is: overcomes the defects of the prior art, and provides a gas mixing device which can be used for mixing O in gas mixture 2 The concentration can be detected, and the SF in the mixed gas can be detected 6 And N 2 SF for detecting concentration 6 /N 2 Mixed gas purity detecting system.
The utility model provides a technical scheme that its technical problem adopted is: the SF 6 /N 2 Mixed gas purity detecting system, its characterized in that: including steady voltage subassembly, gas circuit switching components, oxygen concentration detection module, constant temperature detection module and mass flow meter, the gas inlet intercommunication of gas circuit switching components and constant temperature detection module is passed through to the gas outlet of steady voltage subassembly, and constant temperature detection module's gas outlet and mass flow meter's gas inlet intercommunication, oxygen concentration detection module's gas inlet and gas outlet all communicate with gas circuit switching components.
Preferably, the gas circuit switching assembly comprises a two-position three-way valve for gas inlet and a two-position three-way valve for gas outlet, the gas inlet of the two-position three-way valve for gas inlet is communicated with the gas outlet of the pressure stabilizing assembly, a gas outlet of the two-position three-way valve for gas inlet is communicated with a gas inlet of the two-position three-way valve for gas outlet after being connected with the oxygen concentration detection module in series, another gas outlet of the two-position three-way valve for gas inlet is communicated with another gas inlet of the two-position three-way valve for gas outlet, and the gas outlet of the two-position three-way valve for gas outlet is communicated with the gas inlet of the constant temperature detection module.
Preferably, the pressure stabilizing assembly comprises a pressure reducing valve.
Preferably, the constant temperature detection module include thermal conductance room, thermal conductance formula gas sensor and heating rod, in thermal conductance formula gas sensor's one end extended to the thermal conductance room, the heating rod setting was in the lateral part of thermal conductance room, the gas outlet of gas circuit switching assembly and thermal conductance formula gas sensor's air inlet intercommunication, mass flowmeter's air inlet and thermal conductance formula gas sensor's air outlet intercommunication.
Preferably, the constant temperature detection module further comprises an air inlet coil, the air inlet coil is arranged around the thermal conductivity chamber, an air inlet of the air inlet coil is communicated with an air outlet of the air path switching assembly, and an air outlet of the air inlet coil is communicated with an air inlet of the thermal conductivity type gas sensor.
Preferably, the heating rods are arranged around the heat conducting chamber.
Preferably, the pressure stabilizing device further comprises a pressure sensor, and the pressure sensor is arranged at an air inlet of the pressure stabilizing assembly.
Compared with the prior art, the utility model discloses the beneficial effect who has is:
the SF 6 /N 2 The gas path switching component of the mixed gas purity detection system can enable gas to pass through the oxygen concentration detection module and then enter the constant temperature detection module, so that trace O is respectively detected 2 Concentration, SF 6 Concentration and N 2 The concentration is detected, the mixed gas can not pass through the oxygen concentration detection module and directly enter the constant temperature detection module, and only SF in the mixed gas is detected 6 Concentration and N 2 Concentration detects, avoids oxygen concentration detection module to leak in the air and influence oxygen concentration detection module's life by force, and the detection of concentration can not receive the influence of air, and the degree of accuracy that detects is high, and convenient operation when detecting.
Drawings
FIG. 1 is SF 6 /N 2 The structure of the mixed gas purity detection system is shown schematically.
Fig. 2 is a schematic front sectional view of a thermally conductive gas sensor installed in a thermally conductive chamber.
FIG. 3 is a schematic top view of a thermally conductive gas sensor mounted within a thermally conductive chamber.
In the figure: 1. the device comprises an input port 2, a pressure sensor 3, a pressure reducing valve 4, an air inlet two-position three-way valve 5, an oxygen sensor 6, a heat conduction type gas sensor 7, a heat conduction chamber 8, a heating rod 9, a mass flow meter 10, an output port 11, an air inlet coil pipe 12, an exhaust pipe 13, a thermal resistor 14 and an exhaust two-position three-way valve.
Detailed Description
Fig. 1 to 3 are preferred embodiments of the present invention, and the present invention will be further explained with reference to fig. 1 to 3.
SF 6 /N 2 Mixed gas purity detecting system, including steady voltage subassembly, gas circuit switching module, oxygen concentration detection module, constant temperature detection module and mass flow meter 9, the gas outlet of steady voltage subassembly passes through the gas circuit switching module and communicates with the air inlet of constant temperature detection module, the gas outlet of constant temperature detection module and the air inlet intercommunication of mass flow meter 9, the gas inlet and the gas outlet of oxygen concentration detection module all communicate with gas circuit switching module. The SF 6 /N 2 The gas path switching component of the mixed gas purity detection system can enable gas to pass through the oxygen concentration detection module and then enter the constant temperature detection module, so that trace O is respectively detected 2 Concentration and SF 6 Concentration, N 2 The concentration is detected, the mixed gas can not pass through the oxygen concentration detection module and directly enter the constant temperature detection module, and only SF in the mixed gas is detected 6 Concentration, N 2 Concentration detects, avoids oxygen concentration detection module to leak in the air and influence oxygen concentration detection module's life by force, and the detection of concentration can not receive the influence of air, and the degree of accuracy that detects is high, and convenient operation when detecting.
Specifically, the method comprises the following steps: as shown in fig. 1 to 3: the SF 6 /N 2 The mixed gas purity detection system also comprises a pressure sensor 2, the pressure stabilizing component is a pressure reducing valve 3, the air inlet of the pressure reducing valve 3 is the mixed gas input port 1, the pressure sensor 2 extends into the air inlet of the pressure reducing valve 3 and detects the pressure of the mixed gas in real time, and the pressure reducing valve 3 can adjust the pressure of the mixed gas to ensure that the pressure of the mixed gas is constant. The pressure reducing valve 3 may be a pressure maintaining valve. The oxygen concentration detection module is an oxygen sensor 5.
The gas circuit switching assembly comprises a gas inlet two-position three-way valve 4 and a gas outlet two-position three-way valve 14, the gas inlet two-position three-way valve 4 is provided with a gas inlet and two gas outlets, the gas outlet two-position three-way valve 14 is provided with two gas inlets and a gas outlet, the gas inlet of the gas inlet two-position three-way valve 4 is communicated with the gas outlet of the pressure reducing valve 3, the gas outlet of the gas inlet two-position three-way valve 4 is communicated with the gas inlet of the gas outlet two-position three-way valve 14 after being connected with an oxygen concentration sensor 5 in series, the other gas outlet of the gas inlet two-position three-way valve 4 is directly communicated with the other gas inlet of the gas outlet two-position three-way valve 14, the gas outlet of the gas outlet two-position three-way valve 14 is communicated with the gas inlet of the constant temperature detection module, the gas outlet of the constant temperature detection module is communicated with the gas inlet of the mass flow meter 9, and the gas outlet of the mass flow meter 9 is the output port 10 of the mixed gas.
Constant temperature detection module includes thermal conductance room 7, thermal conductance formula gas sensor 6, heating rod 8, air intake coil 11 and blast pipe 12, wherein thermal conductance formula gas sensor 6 is TCS208 thermal conductance sensor, thermal conductance room 7 is the equal open drum in upper and lower both ends, heating rod 8 sets up in thermal conductance room 7's lateral wall, heating rod 8 encircles thermal conductance room 7 and is provided with many, heating rod 8 is the electrical bar, can heat thermal conductance room 7 inner chamber through heating rod 8. The thermal conductivity type gas sensor 6 is arranged in the thermal conductivity chamber 7, the thermal conductivity type gas sensor 6 and the inner wall of the thermal conductivity chamber 7 are arranged at intervals, the lower part of the air inlet coil 11 is arranged around the upper part of the thermal conductivity chamber 7, the air inlet coil 11 and the inner wall of the thermal conductivity chamber 7 are arranged at intervals, the air inlet of the air inlet coil 11 is communicated with the air outlet of the exhaust two-position three-way valve 14, the air outlet of the air inlet coil 11 extends into the thermal conductivity chamber 7 and is communicated with the thermal conductivity type gas sensor 6 in the thermal conductivity chamber 7, the air inlet of the exhaust pipe 12 extends into the thermal conductivity chamber 7 and is communicated with the thermal conductivity type gas sensor 6 in the thermal conductivity chamber 7, and the air outlet of the exhaust pipe 12 is communicated with the air inlet of the mass flow meter 9. A thermal resistor 13 is also provided in the thermal conduction chamber 7.
The SF 6 /N 2 The working process of the mixed gas purity detection system is as follows: the mixed gas enters the pressure reducing valve 3 through the input port 1, the pressure of the mixed gas is adjusted through the pressure reducing valve 3, the pressure of the mixed gas is constant, and the pressure sensor 2 can detect the mixed gas in real time and enter the pressure reducing valve3 pressure of the gas within.
When it is necessary to detect O 2 During concentration, the mixed gas enters the exhaust two-position three-way valve 14 after passing through the oxygen sensor 5 by the air inlet two-position three-way valve 4 and enters the thermal conductivity type gas sensor 6 by the exhaust two-position three-way valve 14 so as to control SF 6 And (4) detecting the concentration, and discharging the detected mixed gas through an output port 10 after passing through a mass flow meter 9.
The oxygen sensor 5 selectively reacts with oxygen in the mixed gas, and converts the measured chemical parameters into corresponding electric signals for the singlechip to calculate the corresponding trace oxygen concentration; the two three-way valves 4 for air intake have the function of ensuring that the oxygen sensor 5 is prevented from being exposed in air with higher oxygen content for a long time and from generating chemical reaction with the oxygen when the oxygen content of the mixed gas does not need to be detected, and the service life of the oxygen sensor 5 is shortened.
When it is not necessary to detect O 2 During concentration, the mixed gas directly enters the thermal conductivity type gas sensor 6 through the exhaust two-position three-way valve 14 after passing through the intake two-position three-way valve 4.
The sensing element of the heat-conductive gas sensor 6 is in direct contact with the gas to be measured, thus being sensitive to SF 6 Concentration, N 2 And (5) detecting the concentration. Since the thermal conductivity type gas sensor 6 has extremely strict requirements on the ambient temperature and the flow rate, it is necessary to ensure that the ambient temperature is constant and the flow rate of the gas to be measured is minute and constant.
Thermal conductivity type gas sensor 6 pairs SF 6 The concentration is detected and then SF is passed 6 Concentration and O 2 Concentration to N 2 The concentration was calculated.
The mixed gas enters the thermal conductivity type gas sensor 6 through the air inlet coil pipe 11, when the mixed gas in the air inlet coil pipe 11 passes through the thermal conductivity chamber 7, the mixed gas can be heated by the outer wall of the thermal conductivity chamber 7, and the mixed gas enters the thermal conductivity type gas sensor 6 after being heated so as to ensure that O in the mixed gas 2 Concentration, SF 6 Concentration and N 2 The concentration detection is accurate.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (7)
1.SF 6 /N 2 Mixed gas purity detecting system, its characterized in that: including steady voltage subassembly, gas circuit switching components, oxygen concentration detection module, constant temperature detection module and mass flow meter (9), the gas outlet of steady voltage subassembly passes through gas circuit switching components and constant temperature detection module's air inlet intercommunication, constant temperature detection module's gas outlet and mass flow meter (9) air inlet intercommunication, oxygen concentration detection module's air inlet and gas outlet all with gas circuit switching components intercommunication.
2. SF according to claim 1 6 /N 2 Mixed gas purity detecting system, its characterized in that: the gas circuit switching assembly comprises two air inlet three-way valves (4) and two exhaust three-way valves (14), wherein an air inlet of the two air inlet three-way valves (4) is communicated with an air outlet of the pressure stabilizing assembly, an air outlet of the two air inlet three-way valves (4) is communicated with an air inlet of the two exhaust three-way valves (14) after being connected with the oxygen concentration detection module in series, another air outlet of the two air inlet three-way valves (4) is communicated with another air inlet of the two exhaust three-way valves (14), and an air outlet of the two exhaust three-way valves (14) is communicated with an air inlet of the constant temperature detection module.
3. SF according to claim 1 or 2 6 /N 2 Mixed gas purity detecting system, its characterized in that: the pressure stabilizing assembly comprises a pressure reducing valve (3).
4. SF according to claim 1 6 /N 2 Mixed gas purity detecting system, its characterized in that: the constant temperature detection module comprises a heat conduction chamber (7) and heatThe gas path switching device comprises a heat conduction type gas sensor (6) and a heating rod (8), wherein one end of the heat conduction type gas sensor (6) extends into a heat conduction chamber (7), the heating rod (8) is arranged on the side part of the heat conduction chamber (7), a gas outlet of a gas path switching component is communicated with a gas inlet of the heat conduction type gas sensor (6), and a gas inlet of a mass flow meter (9) is communicated with a gas outlet of the heat conduction type gas sensor (6).
5. SF according to claim 4 6 /N 2 Mixed gas purity detecting system, its characterized in that: the constant temperature detection module further comprises an air inlet coil (11), the air inlet coil (11) is arranged around the heat conduction chamber (7), an air inlet of the air inlet coil (11) is communicated with an air outlet of the air path switching assembly, and an air outlet of the air inlet coil (11) is communicated with an air inlet of the heat conduction type gas sensor (6).
6. SF according to claim 4 6 /N 2 Mixed gas purity detecting system, its characterized in that: the heating rod (8) is provided with a plurality of heating rods around the heat conducting chamber (7).
7. SF according to claim 1 6 /N 2 Mixed gas purity detecting system, its characterized in that: still include pressure sensor (2), pressure sensor (2) set up the air inlet at steady voltage subassembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222220399.7U CN218412439U (en) | 2022-08-23 | 2022-08-23 | SF 6 /N 2 Mixed gas purity detection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222220399.7U CN218412439U (en) | 2022-08-23 | 2022-08-23 | SF 6 /N 2 Mixed gas purity detection system |
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| CN218412439U true CN218412439U (en) | 2023-01-31 |
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| CN202222220399.7U Active CN218412439U (en) | 2022-08-23 | 2022-08-23 | SF 6 /N 2 Mixed gas purity detection system |
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