CN109213214B - Mixed gas density controller - Google Patents
Mixed gas density controller Download PDFInfo
- Publication number
- CN109213214B CN109213214B CN201710534642.3A CN201710534642A CN109213214B CN 109213214 B CN109213214 B CN 109213214B CN 201710534642 A CN201710534642 A CN 201710534642A CN 109213214 B CN109213214 B CN 109213214B
- Authority
- CN
- China
- Prior art keywords
- mixed gas
- sensor
- relay
- control module
- pointer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000010453 quartz Substances 0.000 claims abstract description 71
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 71
- 230000005540 biological transmission Effects 0.000 claims abstract description 45
- 230000007246 mechanism Effects 0.000 claims abstract description 43
- 230000010355 oscillation Effects 0.000 claims description 20
- 229910018503 SF6 Inorganic materials 0.000 claims description 13
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 claims description 13
- 229960000909 sulfur hexafluoride Drugs 0.000 claims description 13
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 229910001369 Brass Inorganic materials 0.000 claims description 3
- 229910000906 Bronze Inorganic materials 0.000 claims description 3
- 229910000792 Monel Inorganic materials 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 3
- 239000010951 brass Substances 0.000 claims description 3
- 239000010974 bronze Substances 0.000 claims description 3
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 2
- 230000004044 response Effects 0.000 abstract description 2
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 230000035939 shock Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 126
- 230000008859 change Effects 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000002679 ablation Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D11/00—Control of flow ratio
- G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
- G05D11/035—Controlling ratio of two or more flows of fluid or fluent material with auxiliary non-electric power
- G05D11/06—Controlling ratio of two or more flows of fluid or fluent material with auxiliary non-electric power by sensing density of mixture, e.g. using aerometer
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention provides a mixed gas density controller, which is provided with a shell, a reference air chamber, a quartz sensor, a pressure sensor, a temperature sensor, a transmission connecting rod, a driving mechanism, a micro switch, a movement, a first dial, a first pointer, an oscillating circuit module, a control module, a relay, an electric transmission mechanism, a second dial, a second pointer and a power module, wherein the reference air chamber, the quartz sensor, the pressure sensor, the temperature sensor, the transmission connecting rod, the driving mechanism, the micro switch, the movement, the first dial, the first pointer, the oscillating circuit module, the control module, the relay, the electric transmission mechanism, the second dial, the second pointer and the power module are arranged in the shell, and the quartz sensor is a tuning fork type quartz sensor, so that the electronic monitoring of the mixed gas proportion can be realized in a compact volume on the basis of lower cost. The temperature compensation effect of the adopted reference air chamber is better than that of a thermal bimetallic strip in the prior art, the control precision is higher in the range of a full temperature zone, and the first corrugated pipe, the second corrugated pipe and the micro switch enable the output control signals of the first corrugated pipe, the second corrugated pipe and the micro switch to have higher vibration resistance and shock resistance; the technical scheme provided by the invention has the advantages of small and compact structure, capability of meeting practical requirements, high response speed and high sensitivity.
Description
Technical Field
The invention relates to the technical field of electrical equipment detection, in particular to a mixed gas density controller.
Background
Sulfur hexafluoride (SF) 6 ) There has been a century history of synthetic inert gases synthesized by the french chemists Moissan and Lebeau in 1900, which was used by the united states military for manhattan program (nuclear military) around 1940, and commercially available from 1947. Due to SF 6 The high-voltage power supply has good electrical insulation performance and excellent arc extinguishing performance, and is widely applied to medium-high voltage power equipment such as circuit breakers, closed type combined electrical appliances, closed type pipeline buses, transformers, lightning arresters and the like.
From the viewpoint of environmental protection, SF 6 Is a very powerful greenhouse gas, and SF must be strictly controlled 6 Is used to control SF at present 6 The use is adopted by adopting SF 6 And N 2 Or SF 6 And CF (compact flash) 4 As an insulating mediumOr novel environment-friendly insulating gas is adopted to replace SF 6 Thereby reducing SF 6 The SF is not used even in the amount of 6 . In addition, SF-containing is used 6 Can effectively prevent SF under pressure 6 Liquefaction in a low temperature environment affects the insulation performance and the breaking capacity of high voltage power equipment.
In engineering application, SF 6 Or contain SF 6 The insulating gas such as the mixed gas of (a) is filled in a sealed gas chamber of a high-voltage power equipment at a certain density. The density of the insulating gas determines the insulating performance of the high-voltage power equipment and the switching capacity of the switch, the density of the insulating gas must be continuously monitored in operation, and an alarm signal is sent out even a protection signal such as equipment locking is sent out once leakage occurs and the insulating density is lower than a limit value.
For a closed gas chamber, when the density value of the gas in the closed gas chamber is fixed, the relation between the pressure and the temperature of the gas is as followsWherein p represents the gas pressure, T represents the temperature, ρ represents the density of the body, R represents the gas constant, and M represents the molar mass. From the above formula, it can be found that the air pressure is in direct proportion to the temperature change, i.e. the air pressure rises when the temperature rises and the air pressure drops when the temperature decreases.
Therefore, conventional pressure gauges and pressure switches are not able to correctly detect whether a gas leak has occurred in the closed gas chamber, because the gas pressure may be below a limit value to give a false alarm when the temperature is lowered. To avoid this false alarm, the monitoring instrument based on the pressure measurement principle must have the capability of temperature compensation, i.e. to correct for indication and control deviations caused by changes in the ambient temperature. Currently, a density relay modified from a traditional Bowden tube pressure gauge as shown in fig. 1 is commonly used in the power industry for monitoring SF 6 In fig. 1, 1-bourdon tube, 2-thermal bimetal, 3-movement, 4-pointer, 5-dial. The density relay uses a Bowden tube 1 as a pressure sensing element, and the pressure change caused by the measured gas density change causes deformation displacement of the end of the Bowden tube 1, which displacementThe temperature compensation is compensated by the deformation of the thermal bimetallic strip at different temperatures, and after the movement (which is a transmission mechanism) is amplified, the pointer 4 is driven to deflect, and the gas density (converted into the pressure of 20 ℃) is indicated on the dial 5. The pointer 4 is provided with a deflector rod which can drive the magnetic-assisted electric contact, and when the gas density change exceeds a limit value, the pointer 4 drives the electric contact to be closed or opened, so that an alarm signal is sent.
According to the working process of the pressure gauge type gas density relay, the electric contact point realizing the protection function is driven by the pointer realizing the indication function, and complex mechanical transmission connection exists between the Bowden tube directly reflecting the density change and the electric contact point, so that the control precision of the pressure gauge type gas density relay is limited, the pressure gauge type gas density relay is easily influenced by external vibration and impact, and the protection reliability level is difficult to improve. Secondly, the thermal bimetal is selected according to the normal temperature of 20 ℃, so that the thermal bimetal has optimal precision at 20 ℃, the deviation is increased at other temperatures, and the precision is inconsistent in the working temperature range. The use of the magnetic-assisted electric contact leads to larger switching error, so that only a normally open contact can be used, and the problem that the contact is easy to jump to generate false alarm and ablation easily occurs due to the fact that the closing force of the electric contact is small and is easily influenced by external vibration.
In addition, the pressure gauge type gas density relay needs to refer to SF (sulfur hexafluoride) required by normal operation of high-voltage power equipment 6 The isochoric line is calibrated. Such as for monitoring SF 6 The density of the mixed gas (i.e., the insulating gas) should be calibrated with reference to the isovolumetric line of the mixed gas. The monitoring principle of the pressure gauge type gas density relay is based on pressure and is only applicable to pure SF 6 Or a single component gas, is not fully applicable to a mixed gas of two or more components, because there are two cases in which the density of the mixed gas varies: firstly, density reduction or increase caused by leakage or overcharging is carried out, and the proportion of each component of the mixed gas is unchanged; and secondly, the proportion of the gas in the mixed gas changes, namely the density of the mixed gas changes, but the total pressure can be kept unchanged. In the second case, the change of the gas proportion in the mixed gas can influence the operation of the high-voltage power equipmentPerformance, but the pressure gauge type density relay can not effectively give an alarm in time.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a mixed gas density controller, which is used for respectively acquiring the temperature, the pressure and the density of mixed gas through a temperature sensor, a pressure sensor and a quartz sensor, and controlling an electric transmission mechanism through a control module, so that the electric transmission mechanism of a movement drives a second pointer to indicate the proportion of the mixed gas on a second dial. The technical scheme provided by the invention not only has the capability of detecting the gas proportion in the mixed gas, but also can give an alarm when the gas proportion exceeds a limit value.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention provides a mixed gas density controller which comprises a shell, a reference air chamber, a quartz sensor, a pressure sensor, a temperature sensor, a transmission connecting rod, a driving mechanism, a micro switch, a movement, a first dial, a first pointer, an oscillating circuit module, a control module, a relay, an electric transmission mechanism, a second dial, a second pointer and a power module, wherein the reference air chamber, the quartz sensor, the pressure sensor, the temperature sensor, the transmission connecting rod, the driving mechanism, the micro switch, the movement, the first dial, the first pointer, the oscillating circuit module, the control module, the relay, the electric transmission mechanism, the second dial, the second pointer and the power module are arranged in the shell;
the micro switch is arranged at the fixed end of the reference air chamber, and the driving mechanism is arranged at the middle position of the transmission connecting rod; one end of the transmission connecting rod is connected with the movement, and the other end of the transmission connecting rod is fixedly connected with the movable end of the reference air chamber; the movement is connected with the first pointer and is used for driving the first pointer to indicate the density of the mixed gas on the first dial;
the quartz sensor is connected with the control module through the oscillation circuit module and is used for transmitting the density of the collected mixed gas to the control module; the temperature sensor and the pressure sensor are directly connected with the control module and are used for transmitting the temperature and the pressure of the collected mixed gas to the control module; the control module is connected with the relay and used for controlling the relay to send out an alarm signal; the control module is connected with an electric transmission mechanism, and the electric transmission mechanism drives a second pointer to indicate the proportion of the mixed gas on a second dial;
the power module supplies power for the quartz sensor, the pressure sensor, the temperature sensor, the oscillating circuit module, the control module and the relay.
The reference air chamber comprises a first corrugated pipe and a second corrugated pipe which are coaxially arranged, the outer diameter of the first corrugated pipe is larger than that of the second corrugated pipe, and a closed space formed between the first corrugated pipe and the second corrugated pipe is filled with reference gas.
The first corrugated pipe and the second corrugated pipe are both metal corrugated pipes.
The material of the metal corrugated pipe is bronze, brass, stainless steel, monel alloy or Kang Nieer alloy.
The wave number of the first corrugated pipe is smaller than that of the second corrugated pipe, the wave height of the first corrugated pipe is larger than that of the second corrugated pipe, and the wave distance of the first corrugated pipe is larger than that of the second corrugated pipe.
The quartz sensor comprises a first quartz sensor and a second quartz sensor;
the first quartz sensor and the temperature sensor are both positioned inside the reference air chamber, and the second quartz sensor and the pressure sensor are both positioned outside the reference air chamber;
the components and the pressure of the reference gas in the reference gas chamber and the mixed gas in the tested gas chamber are the same;
the mixed gas comprises sulfur hexafluoride.
The oscillating circuit module comprises a first oscillating circuit and a second oscillating circuit;
the first quartz sensor is connected with the control module through a first oscillating circuit, and the second quartz sensor is connected with the control module through a second oscillating circuit.
The first quartz sensor and the second quartz sensor are both tuning fork type quartz sensors.
The relay comprises a first relay and a second relay;
the first relay is used for sending out an upper limit alarm signal, and the second relay is used for sending out a lower limit alarm signal.
The micro switch is provided with an electric contact, the driving mechanism moves towards the movable end of the reference air chamber under the action of the transmission connecting rod, a bulge arranged at one end of the driving mechanism is contacted with the electric contact to trigger the electric contact to act, and the micro switch sends out an alarm signal.
Compared with the closest prior art, the technical scheme provided by the invention has the following beneficial effects:
the quartz sensor in the technical scheme provided by the invention is connected with the control module through the oscillation circuit module, and the quartz sensor transmits the density of the collected mixed gas to the control module; the temperature sensor and the pressure sensor are directly connected with the control module, and respectively transmit the temperature and the pressure of the collected mixed gas to the control module; the control module is connected with the relay and used for controlling the relay to send out an alarm signal; the control module is connected with the electric transmission mechanism, and the electric transmission mechanism drives the second pointer to indicate the proportion of the mixed gas on the second dial, so that the electronic monitoring of the proportion of the mixed gas is realized;
the micro switch in the technical scheme provided by the invention is arranged at the fixed end of the reference air chamber, the driving mechanism is arranged at the middle position of the transmission connecting rod, one end of the transmission connecting rod is connected with the movement, and the other end of the transmission connecting rod is fixedly connected with the movable end of the reference air chamber; the movement is connected with the first pointer, and drives the first pointer to indicate the density of the mixed gas on the first dial, so that the mechanized indication of the density of the mixed gas is realized;
the temperature compensation effect of the reference air chamber adopted by the technical scheme provided by the invention is better than that of the thermal bimetallic strip in the prior art, the control precision in the whole temperature area range is higher, and the first corrugated pipe, the second corrugated pipe and the micro switch enable the output control signal of the reference air chamber to have higher vibration resistance and shock resistance;
according to the technical scheme provided by the invention, the tuning fork type quartz sensor, the pressure sensor, the temperature sensor and the control module are utilized, so that the monitoring of the proportion of the mixed gas in a compact volume can be realized on the basis of lower cost;
the mixed gas density controller provided by the invention has a small and compact structure, can meet practical requirements, and has high response speed and high sensitivity.
Drawings
FIG. 1 is a block diagram of a prior art pressure gauge gas density relay;
FIG. 2 is a block diagram of a mixed gas density controller in accordance with an embodiment of the present invention;
in FIG. 1, 1-Bowden tube, 2-thermal bimetal, 3-movement, 4-pointer, 5-dial;
in FIG. 2, 6-housing, 7-pressure interface, 8-first bellows, 9-second bellows, 10-transmission link, 11-driving mechanism, 12-micro switch, 13-movement, 14-first dial, 15-first pointer, 16-second dial, 17-second pointer, 31-first oscillating circuit, 32-second oscillating circuit, 33-third oscillating circuit, 34-fourth oscillating circuit, 35-control module, 36-first relay, 37-second relay, 38-electric transmission mechanism, 39-power module, 51-first quartz sensor, 52-fourth quartz sensor, 53-third quartz sensor, 54-second quartz sensor, 55-pressure sensor, 56-temperature sensor, 100-reference air chamber, 101-measured air chamber.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
The structure diagram of the mixed gas density controller provided by the embodiment of the invention is shown in fig. 2, and the mixed gas density controller provided by the embodiment of the invention is communicated with a gas chamber 101 to be tested on a gas path through a pressure interface 7, and mainly comprises a shell 6, a reference gas chamber 100, a quartz sensor, a pressure sensor 55, a temperature sensor 56, a transmission connecting rod 10, a driving mechanism 11, a micro switch 12, a movement 13, a first dial 14, a first pointer 15, an oscillating circuit module, a control module 35, a relay, an electric transmission mechanism 38, a second dial 16, a second pointer 17 and a power module 39, wherein the reference gas chamber 100, the quartz sensor, the pressure sensor 55, the temperature sensor 56, the transmission connecting rod 10, the driving mechanism 11, the micro switch 12, the movement 13, the first dial 14, the first pointer 15, the oscillating circuit module, the control module 35, the relay, the electric transmission mechanism 38, the second dial 16 and the power module 39 are arranged in the shell 6;
the mixed gas density controller may be placed vertically, i.e. in the manner shown in fig. 2, or horizontally, the upper end of the reference gas chamber 100 in fig. 2 is a fixed end, the lower end thereof is a movable end, the micro switch 12 is disposed at the fixed end of the reference gas chamber 100, and the driving mechanism 11 is disposed in the middle of the transmission link 10 at an upper position, i.e. the horizontal height thereof is higher than the horizontal height of the micro switch 12, and a certain distance is reserved between the driving mechanism 11 and the micro switch 12 because the driving mechanism 11 is to move (i.e. move downward) towards the movable end of the reference gas chamber 100 under the action of the transmission link 10. In the downward movement process of the driving mechanism 11, a protrusion arranged at one end of the driving mechanism contacts with an electric contact arranged on the micro switch 12 to trigger the electric contact to act, so that the micro switch 12 can send out an alarm signal.
One end (i.e., upper end) of the transmission connecting rod 10 is connected with the movement 13, and the other end (i.e., lower end) thereof is fixedly connected with the movable end of the reference air chamber 100; the movement 13 is connected with the first pointer 15, and drives the first pointer 15 to indicate the density of the mixed gas on the first dial 14, so as to realize the mechanized indication of the density of the mixed gas.
When the ratio of the mixed gas in the measured air chamber 101 changes due to the wrong operation of filling the mixed gas, the first pointer 15 may not necessarily reflect the change, because the pressure of the measured air may remain unchanged, the bellows using the "differential pressure" principle may not deform, and the micro switch 12 may not be driven to alarm. For this case, a quartz sensor is connected with the control module 35 through an oscillation circuit module, and the quartz sensor transmits the density of the collected mixed gas to the control module 35; the temperature sensor 56 and the pressure sensor 55 are directly connected with the control module 35, and the temperature sensor 56 and the pressure sensor 55 respectively transmit the temperature and the pressure of the collected mixed gas to the control module 35; the control module 35 is in turn connected to the relay, which controls the relay to emit an alarm signal; the control module 35 is also connected with the electric transmission mechanism 38, so that the electric transmission mechanism 28 drives the second pointer 17 to indicate the proportion of the mixed gas on the second dial 16, and electronic monitoring of the proportion of the mixed gas is realized.
The reference air chamber 100 includes a first bellows 8 and a second bellows 9 coaxially disposed, where the outer diameter of the first bellows 8 is larger than the outer diameter of the second bellows 9, i.e., the second bellows 9 is inside the reference air chamber 100, and the first bellows 8 is outside the reference air chamber 100. The closed space formed between the first bellows 8 and the second bellows 9 is filled with a reference gas.
The first corrugated pipe 8 and the second corrugated pipe 9 are metal corrugated pipes, and the metal corrugated pipes are made of bronze, brass, stainless steel, monel alloy or Kang Nieer alloy.
The wave number of the first corrugated tube 8 is smaller than that of the second corrugated tube 9, the wave height of the first corrugated tube 8 is larger than that of the second corrugated tube 9, and the wave pitch of the first corrugated tube 8 is larger than that of the second corrugated tube 9, so the first corrugated tube 8 can be called a large corrugated tube, and the second corrugated tube 9 can be called a small corrugated tube.
The quartz sensor described above includes a first quartz sensor 51 and a second quartz sensor 54, and the first quartz sensor 51 and the second quartz sensor 54 are both tuning fork type quartz sensors. The principle of a tuning fork type quartz sensor is known that the tuning fork type quartz sensor has different oscillation frequencies in gases of different densities. Therefore, in order to eliminate the influence of temperature on the gas viscosity, the first quartz sensor 51 is used as a reference, and the first quartz sensor 51 can be placed in a vacuum cavity with the same temperature or in the reference gas chamber 100, i.e. in contact with the reference gas in the reference gas chamber 100. And the composition and pressure of the reference gas in the reference gas chamber 100 and the mixed gas in the measured gas chamber 101 are the same. The second quartz sensor 54 is placed outside the reference gas chamber 100 in contact with the mixture gas to be measured, and the density of the mixture gas is represented by the difference in frequency between the first quartz sensor 51 and the second quartz sensor 54. In order to eliminate measurement errors caused by individual differences and to improve measurement accuracy and eliminate "drift" caused by temperature, the embodiment of the present invention is further provided with a third quartz sensor 53 and a fourth quartz sensor 52, which are also tuning fork type quartz sensors. The third quartz sensor 53 and the fourth quartz sensor 52 are placed outside the reference gas chamber 100 like the second quartz sensor 54 to be in contact with the mixed gas to be measured, and the reliability of detection can be improved by the redundant third quartz sensor 53 and fourth quartz sensor 52. Also, pressure sensors 55 are located outside the reference gas chamber 100 for collecting the pressure of the mixed gas. Since the temperature inside the reference gas cell 100 is the same as the outside temperature, the temperature sensor 56 is also placed inside the reference gas cell 100 in order to accommodate the size of the reference gas cell 100 and the controller as a whole.
The oscillation circuit module includes a first oscillation circuit 31, a second oscillation circuit 32, and a third oscillation circuit 33 and a fourth oscillation circuit 34, wherein the first quartz sensor 51 is connected to the control module 35 through the first oscillation circuit 31, the second quartz sensor 54 is connected to the control module 35 through the second oscillation circuit 32, the third quartz sensor 53 is connected to the control module 35 through the third oscillation circuit 33, and the fourth quartz sensor 52 is connected to the control module 35 through the fourth oscillation circuit 34.
The relay includes a first relay 36 and a second relay 37, wherein the first relay 36 is used for sending out an upper limit alarm signal, and the second relay 37 is used for sending out a lower limit alarm signal. The same relay can also be used for sending out an upper limit alarm signal and a lower limit alarm signal.
The power module 39 may supply power to the first quartz sensor 51, the pressure sensor 55, the temperature sensor 56, the respective oscillation circuits (i.e., the first oscillation circuit 31, the second oscillation circuit 32, the third oscillation circuit 33, the fourth oscillation circuit 34) in the oscillation circuit module, the control module 35, and the relays (i.e., the first relay 36 and the second relay 37).
The working principle of the mixed gas density controller in the embodiment of the invention is as follows:
for density change of the mixed gas with unchanged proportion, the density is monitored and controlled by using a reference air chamber 100, the reference air chamber 100 formed by the first corrugated pipe 8 and the second corrugated pipe 9 is pre-filled with reference air with the same composition and pressure as the measured mixed gas as a reference and a comparison standard, the measured air is outside the reference air chamber 100, and temperature compensation can be realized and density change of the measured mixed gas is ready to be reflected through air pressure difference inside and outside the reference air chamber 100.
For density change in which the ratio of the mixed gas is changed, the mixed gas is measured by four tuning fork type quartz sensors, a pressure sensor 55 and a temperature sensor 56, respectivelyDensity, pressure and temperature of the body, for SF 6 And N 2 The proportion of the mixed gas can be obtained through an ideal gas equation and a Dalton gas partial pressure law. Through reasonable calibration setting and compensation algorithm, the detection precision of the mixed gas proportion can be realized.
In addition, the transmission connecting rod 10 is prepared from an alloy with 0.075% of carbon, 0.94% of silicon, 0.97% of manganese, 0.035% of phosphorus, 0.025% of sulfur, 14.0% of chromium and the balance of iron, wherein the percentages are weight percentages, and the transmission connecting rod 10 has the advantages of high strength, good toughness and durability, and the transmission connecting rod 10 has strong corrosion resistance and wide application temperature range.
The driving mechanism 11 and the shell 6 are prepared from an alloy with the magnesium content of 2.5%, the manganese content of 0.2%, the copper content of 0.1%, the iron content of 0.2%, the silicon content of 0.4%, the titanium content of 0.1% and the balance of aluminum, wherein the percentages are mass percentages, and the driving mechanism 11 and the shell 6 have the advantages of light weight and high hardness, and are convenient for machining.
The specific process for detecting the proportion of the mixed gas by adopting the mixed gas density controller provided by the embodiment of the invention is as follows:
if the mixed gas is SF 6 And N 2 The gas state equation of the mixed gas is determined by 4 parameters of temperature, pressure, density and mixing ratio, and if three parameters are known, the fourth parameter can be obtained through the gas state equation. The ideal gas state equation is known as:
PV＝nRT
p is the gas pressure, unit Pa; v is the volume of the gas, unit m 3 The method comprises the steps of carrying out a first treatment on the surface of the n is the amount of gaseous material in mol; t is the system temperature, unit K; r is the ideal gas constant in J/(mol·k), and v=m/ρ is known, m is mass, V is volume, ρ is density.
Is provided withFor the average molar mass, there are then:
thus, there are:
with SF 6 /N 2 For example, if the sulfur hexafluoride gas content in the mixed gas is x, the N2 content is 1-x,
then there are:
the ratio of sulfur hexafluoride in the mixed gas, namely the mixing ratio of the mixed gas, can be obtained.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and a person skilled in the art may still make modifications and equivalents to the specific embodiments of the present invention with reference to the above embodiments, and any modifications and equivalents not departing from the spirit and scope of the present invention are within the scope of the claims of the present invention as filed herewith.
Claims (8)
1. The mixed gas density controller is characterized by comprising a shell, a reference air chamber, a quartz sensor, a pressure sensor, a temperature sensor, a transmission connecting rod, a driving mechanism, a micro switch, a movement, a first dial, a first pointer, an oscillating circuit module, a control module, a relay, an electric transmission mechanism, a second dial, a second pointer and a power module, wherein the reference air chamber, the quartz sensor, the pressure sensor, the temperature sensor, the transmission connecting rod, the driving mechanism, the micro switch, the movement, the first dial, the first pointer, the oscillating circuit module, the control module, the relay, the electric transmission mechanism, the second dial, the second pointer and the power module are arranged in the shell;
the micro switch is arranged at the fixed end of the reference air chamber, and the driving mechanism is arranged at the middle position of the transmission connecting rod; one end of the transmission connecting rod is connected with the movement, and the other end of the transmission connecting rod is fixedly connected with the movable end of the reference air chamber; the movement is connected with the first pointer and is used for driving the first pointer to indicate the density of the mixed gas on the first dial;
the quartz sensor is connected with the control module through the oscillation circuit module and is used for transmitting the density of the collected mixed gas to the control module; the temperature sensor and the pressure sensor are directly connected with the control module and are used for transmitting the temperature and the pressure of the collected mixed gas to the control module; the control module is connected with the relay and used for controlling the relay to send out an alarm signal; the control module is connected with an electric transmission mechanism, and the electric transmission mechanism drives a second pointer to indicate the proportion of the mixed gas on a second dial;
the power supply module supplies power for the quartz sensor, the pressure sensor, the temperature sensor, the oscillating circuit module, the control module and the relay;
the reference air chamber comprises a first corrugated pipe and a second corrugated pipe which are coaxially arranged, the outer diameter of the first corrugated pipe is larger than that of the second corrugated pipe, and a closed space formed between the first corrugated pipe and the second corrugated pipe is filled with reference air;
the quartz sensor comprises a first quartz sensor and a second quartz sensor;
the first quartz sensor and the temperature sensor are both positioned inside the reference air chamber, and the second quartz sensor and the pressure sensor are both positioned outside the reference air chamber;
the components and the pressure of the reference gas in the reference gas chamber and the mixed gas in the tested gas chamber are the same;
the mixed gas comprises sulfur hexafluoride.
2. The mixed gas density controller according to claim 1, wherein the first corrugated tube and the second corrugated tube are each metal corrugated tubes.
3. The mixed gas density controller according to claim 2, wherein the material of the metal bellows is bronze, brass, stainless steel, monel or a metal Kang Nieer alloy.
4. The mixed gas density controller according to claim 1 or 2, wherein the wave number of the first corrugated tube is smaller than the wave number of the second corrugated tube, the wave height of the first corrugated tube is larger than the wave height of the second corrugated tube, and the wave pitch of the first corrugated tube is larger than the wave pitch of the second corrugated tube.
5. The mixed gas density controller according to claim 1, wherein the oscillating circuit module includes a first oscillating circuit and a second oscillating circuit;
the first quartz sensor is connected with the control module through a first oscillating circuit, and the second quartz sensor is connected with the control module through a second oscillating circuit.
6. The mixed gas density controller according to claim 1 or 5, wherein the first quartz sensor and the second quartz sensor are both tuning fork type quartz sensors.
7. The mixed gas density controller of claim 1, wherein the relay comprises a first relay and a second relay;
the first relay is used for sending out an upper limit alarm signal, and the second relay is used for sending out a lower limit alarm signal.
8. The mixed gas density controller according to claim 1, wherein the micro switch is provided with an electric contact, the driving mechanism moves towards the movable end of the reference gas chamber under the action of the transmission connecting rod, a protrusion arranged at one end of the driving mechanism contacts with the electric contact to trigger the electric contact to act, and the micro switch sends out an alarm signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710534642.3A CN109213214B (en) | 2017-07-03 | 2017-07-03 | Mixed gas density controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710534642.3A CN109213214B (en) | 2017-07-03 | 2017-07-03 | Mixed gas density controller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109213214A CN109213214A (en) | 2019-01-15 |
| CN109213214B true CN109213214B (en) | 2024-04-02 |
Family
ID=64992467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710534642.3A Active CN109213214B (en) | 2017-07-03 | 2017-07-03 | Mixed gas density controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109213214B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110339067B (en) * | 2019-07-18 | 2022-03-25 | 成都贝酷科技有限公司 | Intelligent feeding bottle base for infants and control method |
Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB498555A (en) * | 1936-12-30 | 1939-01-10 | United Aircraft Corp | Improvements in or relating to density responsive device |
| GB593493A (en) * | 1944-03-01 | 1947-10-17 | Bendix Aviat Corp | Density responsive device |
| JPH11111122A (en) * | 1997-10-03 | 1999-04-23 | Saginomiya Seisakusho Inc | State monitoring device of insulation gas and method for controlling the same |
| CN200997360Y (en) * | 2006-12-11 | 2007-12-26 | 苏丽芳 | Pointer SF6 air-density relay with standard dial |
| WO2008064554A1 (en) * | 2006-11-30 | 2008-06-05 | Shanghai Roye Electric Science And Technology Co., Ltd. | Vibration-resisting pointer sf6 gas density relay |
| CN201166563Y (en) * | 2008-02-15 | 2008-12-17 | 陕西电力科学研究院 | Apparatus for on-line monitoring SF6 gas status of high tension SF6 electrical equipment |
| CN101882532A (en) * | 2009-05-05 | 2010-11-10 | 上海乐研电气科技有限公司 | SF6-gas density relay |
| CN201796123U (en) * | 2010-09-09 | 2011-04-13 | 辽宁省电力有限公司抚顺供电公司 | Checking system of sulfur hexafluoride density relay |
| CN201886964U (en) * | 2010-01-26 | 2011-06-29 | 上海乐研电气科技有限公司 | Sulfur hexafluoride gas density relay capable of resisting temperature change |
| WO2011140986A1 (en) * | 2010-05-14 | 2011-11-17 | 上海乐研电气科技有限公司 | Sulfur hexafluoride gas density relay |
| EP2463639A2 (en) * | 2010-12-10 | 2012-06-13 | Trafag AG | Density monitor |
| EP2796852A1 (en) * | 2013-04-24 | 2014-10-29 | Electronsystem MD S.r.l. | Temperature-compensated fluid density sensor |
| CN104299844A (en) * | 2014-10-21 | 2015-01-21 | 上海乐研电气科技有限公司 | Wide-range sulfur hexafluoride gas density relay |
| CN104377077A (en) * | 2014-10-21 | 2015-02-25 | 上海乐研电气科技有限公司 | High vibration resistance sulfur hexafluoride gas density relay |
| CN104616931A (en) * | 2015-02-02 | 2015-05-13 | 国家电网公司 | Low temperature-resistant digital SF6 relay |
| CN105609368A (en) * | 2015-11-26 | 2016-05-25 | 上海乐研电气科技有限公司 | Gas density relay with gas density level indicator |
| CN205749189U (en) * | 2016-07-01 | 2016-11-30 | 西安华伟电力电子技术有限责任公司 | A kind of bellows-type SF of band remote transfer signal6density controller |
| CN207301823U (en) * | 2017-07-03 | 2018-05-01 | 国网安徽省电力公司电力科学研究院 | A kind of mixed gas density controller |
-
2017
- 2017-07-03 CN CN201710534642.3A patent/CN109213214B/en active Active
Patent Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB498555A (en) * | 1936-12-30 | 1939-01-10 | United Aircraft Corp | Improvements in or relating to density responsive device |
| GB593493A (en) * | 1944-03-01 | 1947-10-17 | Bendix Aviat Corp | Density responsive device |
| JPH11111122A (en) * | 1997-10-03 | 1999-04-23 | Saginomiya Seisakusho Inc | State monitoring device of insulation gas and method for controlling the same |
| WO2008064554A1 (en) * | 2006-11-30 | 2008-06-05 | Shanghai Roye Electric Science And Technology Co., Ltd. | Vibration-resisting pointer sf6 gas density relay |
| CN200997360Y (en) * | 2006-12-11 | 2007-12-26 | 苏丽芳 | Pointer SF6 air-density relay with standard dial |
| CN201166563Y (en) * | 2008-02-15 | 2008-12-17 | 陕西电力科学研究院 | Apparatus for on-line monitoring SF6 gas status of high tension SF6 electrical equipment |
| CN101882532A (en) * | 2009-05-05 | 2010-11-10 | 上海乐研电气科技有限公司 | SF6-gas density relay |
| CN201886964U (en) * | 2010-01-26 | 2011-06-29 | 上海乐研电气科技有限公司 | Sulfur hexafluoride gas density relay capable of resisting temperature change |
| WO2011140986A1 (en) * | 2010-05-14 | 2011-11-17 | 上海乐研电气科技有限公司 | Sulfur hexafluoride gas density relay |
| CN201796123U (en) * | 2010-09-09 | 2011-04-13 | 辽宁省电力有限公司抚顺供电公司 | Checking system of sulfur hexafluoride density relay |
| EP2463639A2 (en) * | 2010-12-10 | 2012-06-13 | Trafag AG | Density monitor |
| EP2796852A1 (en) * | 2013-04-24 | 2014-10-29 | Electronsystem MD S.r.l. | Temperature-compensated fluid density sensor |
| CN104299844A (en) * | 2014-10-21 | 2015-01-21 | 上海乐研电气科技有限公司 | Wide-range sulfur hexafluoride gas density relay |
| CN104377077A (en) * | 2014-10-21 | 2015-02-25 | 上海乐研电气科技有限公司 | High vibration resistance sulfur hexafluoride gas density relay |
| CN104616931A (en) * | 2015-02-02 | 2015-05-13 | 国家电网公司 | Low temperature-resistant digital SF6 relay |
| CN105609368A (en) * | 2015-11-26 | 2016-05-25 | 上海乐研电气科技有限公司 | Gas density relay with gas density level indicator |
| CN205749189U (en) * | 2016-07-01 | 2016-11-30 | 西安华伟电力电子技术有限责任公司 | A kind of bellows-type SF of band remote transfer signal6density controller |
| CN207301823U (en) * | 2017-07-03 | 2018-05-01 | 国网安徽省电力公司电力科学研究院 | A kind of mixed gas density controller |
Non-Patent Citations (3)
| Title |
|---|
| SF_6气体密度继电器的现场检验;路自强, 李玉海, 李红献;青海电力(04);全文 * |
| 洪青云,苏东青.环境温度对断路器SF6密度继电器的影响.自动化应用.2010,全文. * |
| 环境温度对断路器SF_6密度继电器的影响;洪青云;苏东青;;自动化应用(02);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109213214A (en) | 2019-01-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN207301823U (en) | A kind of mixed gas density controller | |
| CN107968018B (en) | High vibration-resistant gas density relay | |
| CN107871642B (en) | High-precision gas density relay | |
| CN103456561B (en) | High-precision sulfur hexafluoride gas density relay | |
| CN109216106B (en) | Mixed gas density relay | |
| CN105609368B (en) | A kind of gas density relay with gas density level indicator | |
| CN102013357A (en) | Sulfur hexafluoride gas density relay | |
| CN107863271B (en) | High-vibration-resistance gas density relay | |
| CN104299844B (en) | A kind of wide range sulfur hexafluoride gas density relay | |
| CN102543571B (en) | Anti-vibration sulfur hexafluoride gas density relay | |
| WO2021218283A1 (en) | Self-diagnostic gas density relay and use method thereof | |
| CN109213214B (en) | Mixed gas density controller | |
| CN104299846B (en) | Wireless remote transmission type sulfur hexafluoride gas density relay | |
| CN109103050B (en) | Method for improving precision of gas density relay | |
| CN110554309A (en) | On-line calibration method for field gas density relay | |
| CN207116321U (en) | A kind of mixed gas density monitor | |
| CN107808798B (en) | Miniaturized wide-range gas density relay | |
| CN208673989U (en) | A kind of high-precision gas density monitor | |
| CN209880484U (en) | SF6 gas density switch capable of temperature compensating for multiple different density values | |
| CN103456560B (en) | A kind of high antivibration sulfur hexafluoride gas density relay | |
| CN209471886U (en) | A kind of bellows-type differential density relay | |
| CN216698221U (en) | Remote transmission gas density relay | |
| CN210245403U (en) | Convenient gas density relay of quick check-up | |
| CN208027973U (en) | Sulfur hexafluoride gas density relay | |
| CN110927566A (en) | Gas density relay with online self-checking function and checking method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |