CN201974199U - Compound type dryness and mass flow instrument - Google Patents
Compound type dryness and mass flow instrument Download PDFInfo
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- CN201974199U CN201974199U CN2011200142432U CN201120014243U CN201974199U CN 201974199 U CN201974199 U CN 201974199U CN 2011200142432 U CN2011200142432 U CN 2011200142432U CN 201120014243 U CN201120014243 U CN 201120014243U CN 201974199 U CN201974199 U CN 201974199U
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- dryness fraction
- signal
- mass dryness
- differential pressure
- density
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Abstract
The utility model relates to a compound type dryness and mass flow instrument. A pipeline meter body is internally provided with a vortex generator and a probe for detecting vortex; the probe sends flow frequency signals to an intelligent amplifier; the pipeline meter body is provided with pressure tapping pipes; the upstream and downstream pressure tapping pipes send differential pressure signals to a differential pressure transmitter; the differential pressure transmitter transmits the differential pressure signals to the intelligent amplifier; signals detected by a temperature sensor is transmitted to the intelligent amplifier; and through the collecting and processing of the intelligent amplifier, the measurement on the density, dryness and mass flow of fluids is realized. The flow instrument is compact in structure, light in weight, small in pressure loss, strong in function and convenient to install and maintain, greatly reduces installation requirements in use, saves pipes, and only occupies the space position of one meter.
Description
Technical field
The utility model relates to a kind of measurement mechanism of pipeline inner fluid medium, the compound mass dryness fraction mass rate of the vortex street differential pressure instrument of specifically a kind of mass dryness fraction of energy measurement pipeline inner fluid, quality, flow.
Background technology
We know that measurement application in commercial production and scientific research test of flow is very extensive, as measuring various flow medias such as liquid, gas, steam, two-phase fluid.Vortex shedding flow meter is the oscillation mode velocity flowmeter that grows up the seventies, the history of three more than ten years so far, and its appearance causes domestic and international flow industry and flow expert's very big concern immediately, develops very rapid.Such instrument has simple in structure, no movable member, and crushing is little, and the flow frequency only changes with flow velocity, and kind and parameter thereof with medium all have nothing to do as pressure, temperature, density etc., and its meter constant of different medium is basic identical.Because the fluid oscillating frequency is directly proportional with speed, thereby this class flow transmitter original signal is linear digital signal, and measuring accuracy is used very extensive than characteristics such as height.
To so far, the vortex shedding flow meter that vortex shedding flow meter both domestic and external all adopts the Karman vortex street principle to make, therefore the vortex shedding flow meter of producing both at home and abroad at present is the same with other big eurypalynous flowmeter, can only measure the volumetric flow rate under the operating mode, but under many situations, people wish that the flow of measuring is weight flow and mark condition flow, realize this measurement requirement, must record the density (ρ) of flow media, need the sensor of the sensor of supporting thermometric degree or measuring pressure like this or need join temperature probe and load cell simultaneously.And above-mentioned signal is passed to the flow integrator computing of tabling look-up obtain density (ρ), formula Q as calculated
G=Q
The worker* ρ obtains mass rate and (annotates: Q
GBe mass rate, Q
The workerBe the operating mode volumetric flow rate, ρ is a Media density).Therefore whole measuring system complexity is installed very inconveniently, and maintenance difficulties is big, and maintenance cost is higher, power supply and signal transmission complexity, and cable laying pipe and cable are also many, the executive cost height, therefore, and a whole set of measuring system cost height, synthesis precision is poor.
Particularly two-phase fluid not only requires the energy measurement mass rate also to want the energy measurement mass dryness fraction as the wet saturated steam two-phase flow, and therefore nearly all flowmeter all can't be measured.At present, the measurement of two-phase flow and the research of dryness measurement are become the difficult problem that countries in the world are captured, the annual international two-phase flow measurement technical seminar of regularly holding, various papers, various detection modes are that let a hundred flowers blossom and a hundred schools of thought contend, people's struggle did not always stop, yet much be to rest on laboratory and theoretical research, do not have the product of complete series standard, even if the product that state's external enwergy provides, cost an arm and a leg performance and poor practicability.
In the application and research practice of for many years two-phase flow, the applicant once utility model and successful Application measures operating mode volumetric flow rate or flow velocity with a vortex shedding flow meter, form composite mass flowmeter with another table vortex shedding flow meter or target type meter or differential pressure flowmeter and receive effect preferably, but because of many table packs together, its table body length is longer, the volume heaviness, and price is more expensive, crushing is bigger, and maintenance workload is bigger etc.
Summary of the invention
Technical problem to be solved in the utility model is to overcome above-mentioned the deficiencies in the prior art, provide structure a kind of advantages of simple, install and easy construction, crushing is little, volume is little, can realize the mass dryness fraction of convection cell, the compound mass dryness fraction mass rate instrument of mass rate measuring multiple parameters.
The technical scheme in the invention for solving the above technical problem is: a kind of compound mass dryness fraction mass rate instrument, it is provided with a pipeline table body, it is characterized in that: the probe that a vortex generation body and detects vortex is installed in the described pipeline table body, and probe is sent to intelligent amplifier with the flow frequency signal that detects; The upstream and downstream of vortex generation body are respectively equipped with the pressure pipe on the described pipeline table body, and the pressure pipe connects a differential pressure transmitter, and upstream and downstream pressure pipe sends differential pressure signal to differential pressure transmitter, and differential pressure transmitter is sent to intelligent amplifier with differential pressure signal; On the described pipeline table body temperature or pressure transducer are installed also, the signal that temperature or pressure transducer detect is sent to intelligent amplifier; Flow frequency signal, differential pressure signal, temperature or pressure signal be by intelligent amplifier collection, processing, realizes mass dryness fraction, the density of convection cell, the measurement and the demonstration of mass rate.
The utility model technique scheme is integrated with vortex shedding flow meter, differential pressure throttle device, temperature or pressure transducer, a shared table body, a shared vortex generation body, a shared power supply, a shared powerful intelligent amplifier, the purpose of the dryness measurement of realization fluid and the measuring multiple parameters such as mass flow measurement of fluid.Compact integral structure, as same vortex shedding flow meter or a differential pressure flowmeter size, complete machine is small and exquisite, in light weight, crushing is little, function is strong, the utility model reduces the installation requirement in the use greatly, save tubing, only account for the locus of a table and shorten greatly before and after the length of straight length, reduced the requirement that technology is installed, it is very convenient to install, safeguard.
Another technical scheme that the utility model solves the problems of the technologies described above employing is: a kind of compound mass dryness fraction mass rate instrument, it is provided with a pipeline table body, it is characterized in that: the probe that a vortex generation body and detects vortex is installed in the described pipeline table body, probe is sent to intelligent amplifier with the flow frequency signal that detects, and separates the amplitude signal of corresponding mass dryness fraction or density through processing and amplifying; Also connect a temperature or pressure transducer on the described pipeline table body, the signal that temperature or pressure transducer detect is sent to intelligent amplifier; Flow frequency signal, amplitude signal and temperature or pressure signal pass through the CPU microprocessor of intelligent amplifier to be gathered, handle, demarcates, and generates mass dryness fraction or density measure curve, the measurement of the mass dryness fraction of realization convection cell, density, mass rate.
The flow frequency signal that the utility model detects described probe is isolated the amplitude signal of corresponding mass dryness fraction or density, with the flow frequency signal, amplitude signal and temperature or pressure signal are gathered through the CPU microprocessor, signal Processing, in mass dryness fraction or density range that needs are measured, select several calibration points, obtain the mass dryness fraction value of each calibration point by chemical examination, measure amplitude or flow frequency values and the temperature or the force value of the amplitude signal of each calibration point correspondence, then with the mass dryness fraction value of each calibration point, amplitude or flow frequency values, temperature or force value are as one group of calibrating parameters, the calibrating parameters of each calibration point is inserted the CPU microprocessor, generate a mass dryness fraction or density measure curve after the CPU microprocessor processes, realize mass dryness fraction, density, the measurement of mass rate parameter.
The utility model technique scheme only adds that with a vortex shedding flow meter temperature or pressure transducer just can realize the measurement of above-mentioned multiparameter.A differential pressure flowmeter utmost point and supporting valve accessories thereof be can save, isolator, pressure guiding pipe and transmitter bursting by freezing particularly are afraid of in the winter time.Therefore, to the user more selection has been arranged, the user can be according to circumstances, assembly flexibly, both economized expense, and is safer.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is the structural representation of the utility model embodiment 1.
Fig. 2 is the structural representation that increases fairing among Fig. 1.
Fig. 3 is the structural representation of the utility model embodiment 2.
Fig. 4 is the utility model embodiment 2 intelligent amplifier theory diagrams.
Fig. 5 is another theory diagrams of the utility model embodiment 2 intelligent amplifiers.
Label among the figure is: 1. vortex generation body, 2. pipeline table body, 3. pressure pipe, 4. stop valve, 5. probe, 6. support and connection body, 7. intelligent amplifier, 8. temperature or pressure transducer, 9. differential pressure transmitter, 10. fairing, 11. balances, three valve groups, 12. isolators.
Embodiment
Embodiment 1: as can be seen from Figure 1, a kind of compound mass dryness fraction mass rate instrument, it is provided with a pipeline table body 2, the probe 5 that one vortex generation body 1 and detects vortex is installed in the pipeline table body 2, the probe outside is provided with support and connection body 6, support and connection body 6 bottoms are fastened on the pipeline table body 2, and intelligent amplifier 7 connect is supported on top, and probe 5 is sent to intelligent amplifier 7 with the flow frequency signal; The upstream and downstream of vortex generation body are respectively equipped with pressure pipe 3 on the described pipeline table body 2, and pressure pipe 3 connects a differential pressure transmitter 9, and pressure pipe in upstream and downstream sends differential pressure signal to differential pressure transmitter 9, and differential pressure transmitter 9 is sent to intelligent amplifier 7 with differential pressure signal; The upstream of vortex generation body or downstream also connect a temperature or pressure transducer 8 on the described pipeline table body 2, and the signal that temperature or pressure transducer 8 detect is sent to intelligent amplifier; Flow frequency signal, differential pressure signal, temperature or pressure signal be by intelligent amplifier collection, processing, realizes density, the mass dryness fraction of convection cell, the measurement and the demonstration of mass rate.
Pipeline table body 2 is the matrixes that connect fluid line and probe 5, pressure pipe 3, temperature or the parts such as pressure transducer 8, support and connection body 6 of vortex generation body 1, detection vortex are installed in this device.1 effect of vortex generation body mainly is to isolate well-regulated vortex when making fluid flow through this generation body, also be the throttling element of differential pressure gauge simultaneously, this vortex produces oscillation force to the probe 5 that detects vortex, probe 5 is subjected to flow signal being delivered to after the effect of vortex oscillation force the preposition amplification treatment circuit of intelligent amplifier 7, input CPU microprocessor computing and signal Processing after the late-class circuit conversion process.Support and connection body 6 mainly is connecting tube table body 2 and intelligent amplifier 7, plays the interference to the probe lead wire of detection vortex of support intelligent amplifier and shielding external magnetic field.Pressure pipe 3 is installed in the upstream and downstream of the vortex generation body 1 in the pipeline table body 2, and it is transported to differential pressure transmitter 9 with the differential pressure guiding that vortex generation body upstream and downstream forms.On the pressure pipe 3 stop valve 4 can also be installed, stop valve 4 effects are that debugging and maintenance are used.Also be connected with balance three valve groups 11 and isolator 12 between differential pressure transmitter 9 and the pressure pipe 3.The effect of balance three valve groups 11 is to adjust differential pressure zero point and maintenance differential pressure transmitter 9 usefulness.The effect of isolator 12 is that high-temperature medium is isolated, and causes damage to avoid high temperature to be transmitted to differential pressure transmitter, and differential pressure transmitter 9 passes to intelligent amplifier 7 after differential pressure is become the electric signal processing and amplifying.
Can not satisfy under the situation of the normal technical requirement of instrument at flow development length among this embodiment, particularly under the situation that two-phase fluid such as wet saturated steam mass dryness fraction wide ranges, mass dryness fraction are lower, the upstream extremity of pipeline table body 2 is connection one fairing 10 also.Otherwise instrument can't operate as normal.As shown in Figure 2.The concrete composition structure of fairing 10 is described in detail in the applicant ZL200920308865.9.
Above-mentioned all signals comprise the collection of CPU microprocessor, signal Processing by intelligent amplifier of flow frequency signal (containing amplitude signal), differential pressure signal, temperature or pressure signal, calculate, table look-up, software design programming etc., realize density, the mass dryness fraction of convection cell, the measurement and the demonstration of mass rate.And outputting standard signal 4-20mA, 485 communication signals, GPRS wireless remote transmission signal.
The utility model embodiment 1 course of work and principle are: fluid is during by vortex generation body 1, alternately produce vortex in its both sides, downstream, swirling action power produces lift to the probe 5 that detects vortex, this signal amplifies through amplifying circuit, filtering, be shaped to pulse duration frequency signal, this frequency signal is the flow frequency signal.Be Q
The worker=3600 (second) * f/k(formulas 1), Q wherein
The workerBe the volumetric flow rate (m under the operating mode
3/ h), f is the flow frequency, k is a meter constant.Simultaneously, fluid is during by vortex generation body 1, form malleation at its upstream, the downstream forms negative pressure, pressure pipe 3 by upstream and downstream is sent to differential pressure transmitter 9 with its differential pressure signal, electric signal by differential pressure transmitter output differential pressure is sent to intelligent amplifier 7 again, meets following calculating formula: Q according to Bernoulli's theorem at the differential pressure signal that the throttling element upstream and downstream forms
The worker=k
(formula 2), wherein Q
The workerBe the operating mode volumetric flow rate,
Be differential pressure value, ρ is a medium operating mode density, and k is a coefficient.With the Q in the formula 1
The workerρ density can be tried to achieve in the substitution formula 2, thereby mass rate can be tried to achieve.Be Q
G=Q
The workerρ, wherein Q
GBe mass rate, moreover, because the mass dryness fraction of wet saturated steam becomes corresponding relational expression with temperature (or pressure), density, still measured temperature (or pressure) and density just can be measured mass dryness fraction through computation of table lookup.The precision that the utility model measuring accuracy height, good stability are particularly measured mass dryness fraction is better than 3%, is better than the precision and the performance of other method measurement both at home and abroad greatly.
This device is not simple Trinitarian unitized construction, but the characteristic that they are total combines dexterously, promptly three kinds of shared one of measuring instruments are shown bodies, a shared vortex generation body, a shared power supply, a shared powerful intelligent amplifier, the purpose of the dryness measurement of realization fluid and the measuring multiple parameters such as mass flow measurement of fluid, so compact integral structure such as same vortex shedding flow meter or a differential pressure flowmeter size, complete machine is small and exquisite, in light weight, crushing is little, function is strong.The utility model reduces the installation requirement in the use greatly, saves tubing, only accounts for the locus of a table, and it is very convenient to install, safeguard.
Embodiment 2: as can be seen from Figure 3, a kind of compound mass dryness fraction mass rate instrument, it is provided with a pipeline table body 2, the probe 5 that one vortex generation body 1 and detects vortex is installed in the described pipeline table body 2,5 outsides of popping one's head in are provided with support and connection body 6, and support and connection body 6 bottoms are fastened on the pipeline table body, and top connects supports intelligent amplifier 7, probe 5 is sent to intelligent amplifier 7 with the flow frequency signal that detects, and separates the amplitude signal of corresponding mass dryness fraction or density through processing and amplifying; The upstream of vortex generation body or downstream also connect a temperature or pressure transducer 8 on the described pipeline table body, and the signal that temperature or pressure transducer detect is sent to intelligent amplifier 7; Flow frequency signal, amplitude signal and temperature or pressure signal pass through the CPU microprocessor of intelligent amplifier to be gathered, handle, demarcates, and generates mass dryness fraction or density measure curve, the measurement of the density of realization convection cell, mass dryness fraction, mass rate.
Can not satisfy under the situation of the normal technical requirement of instrument at flow development length among this embodiment, particularly under the situation that two-phase fluid such as wet saturated steam mass dryness fraction wide ranges, mass dryness fraction are lower, the upstream extremity of pipeline table body 2 is connection one fairing also.The concrete composition structure of fairing is described in detail in the applicant ZL200920308865.9.
It utilizes the Karman vortex street flowmeter the utility model, the flow frequency signal of described probe detection is isolated the amplitude signal of corresponding mass dryness fraction or density, with the flow frequency signal, amplitude signal and temperature or pressure signal are gathered through the CPU microprocessor, signal Processing, in the mass dryness fraction scope that needs are measured, select several calibration points, obtain the mass dryness fraction value of each calibration point by chemical examination, measure amplitude or flow frequency values and the temperature or the force value of the amplitude signal of each calibration point correspondence, then with the mass dryness fraction value of each calibration point, amplitude or flow frequency values, temperature or force value are as one group of calibrating parameters, the calibrating parameters of each calibration point is inserted the CPU microprocessor, generate a dryness measurement curve after the CPU microprocessor processes, realize mass dryness fraction, density, the measurement of mass rate parameter.
Based on the relation that exists between mass dryness fraction, density and temperature or the pressure three, when knowing that mass dryness fraction and temperature or pressure just knows corresponding density, equally when knowing that density and temperature or pressure just knows corresponding mass dryness fraction.Therefore the utility model mass dryness fraction calibration measuring method equally also is the density calibration measuring method.Therefore, as long as solve one of them parameter value of mass dryness fraction and density, just can realize measuring needed mass dryness fraction and density.
The utility model only adds that with a vortex shedding flow meter temperature or pressure transducer just can realize the measurement of above-mentioned multiparameter.Can save an extremely supporting valve accessories of differential pressure flowmeter, particularly be afraid of isolator, pressure guiding pipe and transmitter bursting by freezing in the winter time, therefore, to the user more selection arranged, the user can be according to circumstances, assembly flexibly, both economized expense, and is safer.
Fig. 4 and Fig. 5 are the theory diagrams of the utility model embodiment 2 intelligent amplifiers.
As can be seen from Figure 4, the vortex oscillator signal that intelligent amplifier 7 will detect probe 5 detections of vortex is sent to preposition amplification treatment circuit (being called preposition amplification), the level amplification treatment circuit is isolated two paths of signals after the signal of preposition processing and amplifying is sent to: one road signal is the flow frequency signal, described flow frequency signal calculates instantaneous volume flow rate (m through CPU
3/ h).Another road signal is the amplitude signal of mass dryness fraction or density correspondence, and this signal magnitude changes and density (ρ) size variation of fluid is corresponding relation, and above-mentioned two kinds of signals are gathered, handled through the CPU microprocessor.
As can be seen from Figure 5, intelligent amplifier 7 will detect the vortex oscillator signal that the probe 5 of vortex detects and be sent to first order amplification treatment circuit (being called front end circuit), and a grade amplification treatment circuit directly is sent to the CPU microprocessor and gathers, handles through the signal of preposition processing and amplifying is sent to after.
The utility model is in the mass dryness fraction scope that needs are measured, select several calibration points, generally select 2～5 calibration points to get final product, obtain the mass dryness fraction value of each calibration point by chemical examination, measure signal amplitude or flow frequency values and the temperature value or the force value of each calibration point correspondence, as one group of calibrating parameters.Resulting each the group calibrating parameters of each calibration point is inserted the CPU processor, handle the back and generate a mass dryness fraction or density measure curve, just can record mass dryness fraction or density.For example: select three mass dryness fraction calibration points in the steam boiler outlet: first mass dryness fraction calibration point is 75 through chemically examining its mass dryness fraction value, and recording temperature is 320 ℃, and can table look-up and obtain density value this moment is 83.44kg/m
3, the amplitude that records this mass dryness fraction or density correspondence is 0.25mv; Second mass dryness fraction calibration point is 65 through chemically examining its mass dryness fraction value, and recording temperature is 300 ℃, and table look-up and obtain density value this moment is 68.66 kg/m
3, the amplitude of mass dryness fraction or density correspondence is 0.19mv.The 3rd mass dryness fraction calibration point is 55 through chemically examining its mass dryness fraction value, and recording temperature is 280 ℃, and obtain density value through tabling look-up this moment is 58.17 kg/m
3, the amplitude of mass dryness fraction or density correspondence is 0.09mv.Mass dryness fraction value (or density value), amplitude (mv), the temperature value (or force value) of above-mentioned three calibration points are inserted intelligent amplifier, handle the back and generate a mass dryness fraction or density measure curve.Just can record any mass dryness fraction value (or density value) in 55%～75% mass dryness fraction scope.The precision of mass dryness fraction that this method is surveyed is≤3%, is far superior to other metering system (5%～10%) both at home and abroad, and signal stabilization, can satisfy the technical requirement that the two-phase flow wet saturated steam is measured.Again for example: select three mass dryness fraction calibration points in the steam boiler outlet: first mass dryness fraction calibration point is 75 through chemically examining its mass dryness fraction value, and recording temperature is 320 ℃, and can table look-up and obtain density value this moment is 83.44 kg/m
3, record this mass dryness fraction or density corresponding flow frequency values is 270 Hz; Second mass dryness fraction calibration point is 65 through chemically examining its mass dryness fraction value, and recording temperature is 300 ℃, and table look-up and obtain density value this moment is 68.66 kg/m
3, mass dryness fraction or density corresponding flow frequency values are 240 Hz.The 3rd mass dryness fraction calibration point is 55 through chemically examining its mass dryness fraction value, and recording temperature is 280 ℃, and obtain density value through tabling look-up this moment is 58.17 kg/m
3, mass dryness fraction or density corresponding flow frequency values are 205 Hz.Mass dryness fraction value (or density value), flow frequency values, the temperature value (or force value) of above-mentioned three calibration points are inserted intelligent amplifier, handle the back and generate a mass dryness fraction or density measure curve.Just can record any mass dryness fraction value (or density value) in 55%～75% mass dryness fraction scope.The precision of mass dryness fraction that this method is surveyed is≤3%, is far superior to other metering system (5%～10%) both at home and abroad, and signal stabilization, can satisfy the technical requirement that the two-phase flow wet saturated steam is measured.
The compound mass dryness fraction mass rate of vortex street differential pressure of the present utility model instrument, for the application of Karman vortex street principle is opened brand-new one page with research, be historically once to leap and innovate, its special advantages is that other flow instrument is incomparable, will exert far reaching influence, set up new platform for entering the international market foreign exchange earning, its economic benefit and social benefit are very huge.
Claims (4)
1. compound mass dryness fraction mass rate instrument, it is provided with a pipeline table body, it is characterized in that: the probe that a vortex generation body and detects vortex is installed in the described pipeline table body, and the flow frequency signal that probe will detect is sent to intelligent amplifier; The upstream and downstream of vortex generation body are respectively equipped with the pressure pipe on the described pipeline table body, and the pressure pipe connects a differential pressure transmitter, and upstream and downstream pressure pipe sends differential pressure signal to differential pressure transmitter, and differential pressure transmitter is sent to intelligent amplifier with differential pressure signal; On the described pipeline table body temperature or pressure transducer are installed also, the signal that temperature or pressure transducer detect is sent to intelligent amplifier; Flow frequency signal, differential pressure signal, temperature or pressure signal be by intelligent amplifier collection, processing, realizes mass dryness fraction, the density of convection cell, the measurement and the demonstration of mass rate.
2. according to the described compound mass dryness fraction mass rate instrument of claim 1, it is characterized in that connection one fairing being installed at pipeline table body upstream extremity.
3. compound mass dryness fraction mass rate instrument, it is provided with a pipeline table body, it is characterized in that: the probe that a vortex generation body and detects vortex is installed in the described pipeline table body, probe is sent to intelligent amplifier with the flow frequency signal that detects, and separates the amplitude signal of corresponding mass dryness fraction or density through processing and amplifying; Also connect a temperature or pressure transducer on the described pipeline table body, the signal that temperature or pressure transducer detect is sent to intelligent amplifier; Flow frequency signal, amplitude signal and temperature or pressure signal pass through the CPU microprocessor of intelligent amplifier to be gathered, handle, demarcates, and generates mass dryness fraction or density measure curve, the measurement of the mass dryness fraction of realization convection cell, density, mass rate.
4. according to the described compound mass dryness fraction mass rate instrument of claim 3, it is characterized in that connection one fairing being installed at pipeline table body upstream extremity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200142432U CN201974199U (en) | 2011-01-18 | 2011-01-18 | Compound type dryness and mass flow instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200142432U CN201974199U (en) | 2011-01-18 | 2011-01-18 | Compound type dryness and mass flow instrument |
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| Publication Number | Publication Date |
|---|---|
| CN201974199U true CN201974199U (en) | 2011-09-14 |
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ID=44579300
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| CN2011200142432U Expired - Lifetime CN201974199U (en) | 2011-01-18 | 2011-01-18 | Compound type dryness and mass flow instrument |
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| CN (1) | CN201974199U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102095461A (en) * | 2011-01-18 | 2011-06-15 | 姚贤卿 | Compound type dryness mass flow instrument and dryness calibration and measurement method |
-
2011
- 2011-01-18 CN CN2011200142432U patent/CN201974199U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102095461A (en) * | 2011-01-18 | 2011-06-15 | 姚贤卿 | Compound type dryness mass flow instrument and dryness calibration and measurement method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110914 Effective date of abandoning: 20120718 |