CN210375233U - Gas flowmeter temperature-detecting device - Google Patents
Gas flowmeter temperature-detecting device Download PDFInfo
- Publication number
- CN210375233U CN210375233U CN201921722954.8U CN201921722954U CN210375233U CN 210375233 U CN210375233 U CN 210375233U CN 201921722954 U CN201921722954 U CN 201921722954U CN 210375233 U CN210375233 U CN 210375233U
- Authority
- CN
- China
- Prior art keywords
- temperature sensor
- operational amplifier
- frequency
- resistor
- gas flowmeter
- 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
Images
Landscapes
- Measuring Volume Flow (AREA)
- Details Of Flowmeters (AREA)
Abstract
The utility model discloses a temperature detection device of a gas flowmeter, which comprises a temperature sensor, a signal processing unit and a microprocessor, wherein the temperature sensor is an infrared temperature sensor J1 arranged in a fluid channel, the signal processing unit comprises a frequency-selecting amplifying circuit and a reference isolating circuit, the infrared temperature sensor J1 detects the temperature in the fluid channel, the frequency-selecting amplifying circuit eliminates clutter interference by utilizing LC filtering frequency-selecting principle, effectively improves the accuracy of temperature detection signals, adds capacitance compensation in the operational amplification process, ensures the temperature detection signals to be continuously and stably output, effectively reduces system errors, the reference isolating circuit improves the calculation processing accuracy of the microprocessor to the temperature detection signal data, and plays the role of isolating interference, the utility model effectively improves the response speed and the anti-interference performance of the gas flowmeter, and leads the detection result of the gas flowmeter to be more accurate, the reading is more stable.
Description
Technical Field
The utility model relates to a gas turbine flowmeter technical field especially relates to a gas flowmeter temperature-detecting device.
Background
The turbine type gas flowmeter is mainly used for measuring the flow of medium fluids such as air, nitrogen and oxygen in an industrial pipeline, a fluid channel is arranged inside a shell of the turbine type gas flowmeter, a vortex generating body is arranged at a contraction section of the fluid channel, a deswirler is fixed at an outlet section of the fluid channel, a temperature detection device is arranged on the shell, the temperature detection device detects the temperature value of the fluid in the fluid channel under the working condition, a pressure detection device is arranged to detect the local atmospheric pressure value, and a frequency detection device is arranged to detect the frequency of vortex precession. And finally, transmitting the detection result to a microprocessor for calculation so as to obtain the volume flow value of the gas under the standard condition.
The temperature detection device of the existing turbine gas flowmeter usually adopts a temperature sensor with a Pt100 platinum resistor as a temperature sensitive element to detect the temperature in a fluid passage, although the platinum resistor has the advantages of high precision and good linearity, the defect of slow thermal response of the platinum resistor is particularly prominent under the condition of large gas flow in the fluid passage, and signals are easily subjected to vibration interference under the impact of strong gas flow, so that the response speed of the turbine gas flowmeter is slow, and the reading is unstable.
So the utility model provides a new scheme to solve the problem.
SUMMERY OF THE UTILITY MODEL
To the above situation, in order to overcome the defects of the prior art, an object of the present invention is to provide a temperature detecting device for a gas flowmeter.
The technical scheme for solving the problem is as follows: the utility model provides a gas flowmeter temperature-detecting device, includes temperature sensor, signal processing unit and microprocessor, temperature sensor is the infrared temperature sensor J1 who sets up in fluid passage, the signal processing unit includes frequency-selecting amplifier circuit and benchmark isolating circuit, infrared temperature sensor J1's signal output part is connected to frequency-selecting amplifier circuit's input, frequency-selecting amplifier circuit's output is connected benchmark isolating circuit's input, benchmark isolating circuit's output is connected microprocessor.
Furthermore, the frequency-selecting amplifying circuit comprises triodes Q1 and Q2, the base electrode of a triode Q1 is connected with the signal output end of the infrared temperature sensor through a capacitor C1 and is grounded through a resistor R1, the collector electrode of a triode Q1 is connected with a +5V power supply and one end of a capacitor C2 through an inductor L1, the emitter electrode of the triode Q1 is connected with the base electrode of a triode Q2, the collector electrode of the triode Q2 is connected with the other end of the capacitor C2 through a resistor R2, and the emitter electrode of a triode Q2 is grounded.
Further, the frequency-selective amplifying circuit further comprises an operational amplifier AR1, a non-inverting input terminal of the operational amplifier AR1 is connected to a collector of the transistor Q2 through a capacitor C3, and is connected to an output terminal of the operational amplifier AR1 through a resistor R3 and a capacitor C4 which are connected in parallel, and an inverting input terminal of the operational amplifier AR1 is grounded.
Further, the reference isolation circuit comprises an operational amplifier AR2, a non-inverting input terminal of the operational amplifier AR2 is connected to one ends of resistors R4 and R5 and an output terminal of the operational amplifier AR1 through a capacitor C5, the other end of the resistor R4 is connected to a +5V power supply, the other end of the resistor R5 is grounded, and an inverting input terminal of the operational amplifier AR2 is connected to the output terminal of the operational amplifier AR2 and the input terminal of the microprocessor through a resistor R6.
Through the technical scheme, the beneficial effects of the utility model are that:
1. the utility model adopts the infrared temperature sensor J1 to detect the temperature in the fluid channel, and has the characteristics of slow response speed, vibration resistance and strong impact resistance;
2. the frequency-selecting amplifying circuit is used for rapidly amplifying an output signal of the infrared temperature sensor J1, eliminating clutter interference by utilizing an LC filtering frequency-selecting principle, effectively improving the accuracy of a temperature detection signal, adding capacitance compensation in the operational amplification process, ensuring that the temperature detection signal is continuously and stably output, and effectively reducing system errors;
3. the reference isolation circuit improves the calculation processing precision of the microprocessor on the temperature detection signal data and plays a role in isolating interference.
Drawings
Fig. 1 is a schematic diagram of the frequency-selective amplifying circuit of the present invention.
Fig. 2 is a schematic diagram of the reference isolation circuit of the present invention.
Detailed Description
The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings of fig. 1 to 2. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
The utility model provides a gas flowmeter temperature-detecting device, includes temperature sensor, signal processing unit and microprocessor, and temperature sensor is the infrared temperature sensor J1 who sets up in fluid passage, has that response speed is slow fast, the characteristics of resistant vibration and shock resistance are strong.
In order to improve the accuracy and stability of the infrared temperature sensor J1 in detecting the temperature in the fluid channel, the signal processing unit processes the output signal of the infrared temperature sensor J1 by designing a frequency-selecting amplifying circuit and a reference isolating circuit. The input end of the frequency-selecting amplifying circuit is connected with the signal output end of the infrared temperature sensor J1, the output end of the frequency-selecting amplifying circuit is connected with the input end of the reference isolating circuit, and the output end of the reference isolating circuit is connected with the microprocessor.
As shown in fig. 1, the output signal of the infrared temperature sensor J1 is first sent to a frequency-selective amplifier circuit for amplification. The frequency-selecting amplifying circuit comprises triodes Q1 and Q2, the base electrode of a triode Q1 is connected with the signal output end of the infrared temperature sensor through a capacitor C1 and is grounded through a resistor R1, the collector electrode of a triode Q1 is connected with a +5V power supply and one end of a capacitor C2 through an inductor L1, the emitter electrode of the triode Q1 is connected with the base electrode of a triode Q2, the collector electrode of the triode Q2 is connected with the other end of the capacitor C2 through a resistor R2, and the emitter electrode of a triode Q2 is grounded.
The output signal of the infrared temperature sensor J1 is coupled by a capacitor C1 and then sent into a combined amplifying tube composed of triodes Q1 and Q2 for rapid amplification. The inductor L1 and the capacitor C2 are connected in parallel to play a role in frequency-selecting and filtering in the amplification process of the combined amplification tube, so that clutter interference signals outside the frequency of the output signals of the infrared temperature sensor J1 are filtered, and the accuracy of temperature detection signals is effectively improved.
In order to improve the stability of the temperature detection signal, the frequency-selective amplifier circuit further performs an operational amplifier compensation process on the output signal of the combined amplifier tube by arranging an operational amplifier AR 1. The non-inverting input end of the operational amplifier AR1 is connected with the collector of the triode Q2 through a capacitor C3, and is connected with the output end of the operational amplifier AR1 through a resistor R3 and a capacitor C4 which are connected in parallel, and the inverting input end of the operational amplifier AR1 is grounded. The capacitor C4 plays a role in signal compensation in the amplification process of the operational amplifier AR1, so that the temperature detection signal is continuously and stably output, and the system error is effectively reduced.
The output signal of the op-amp AR1 is fed into a reference isolation circuit for further processing. As shown in fig. 2, the reference isolation circuit includes an operational amplifier AR2, a non-inverting input terminal of the operational amplifier AR2 is connected to one ends of resistors R4 and R5 and an output terminal of the operational amplifier AR1 through a capacitor C5, the other end of the resistor R4 is connected to a +5V power supply, the other end of the resistor R5 is grounded, and an inverting input terminal of the operational amplifier AR2 is connected to the output terminal of the operational amplifier AR2 and the input terminal of the microprocessor through a resistor R6. The resistors R4 and R5 divide the voltage of the +5V power supply by using a resistor voltage division principle, so that a reference voltage is applied to the temperature detection signal output by the operational amplifier AR1, and the accuracy of the microprocessor in calculating and processing the temperature detection signal data is improved. The operational amplifier AR2 uses the isolator principle to send the processed temperature detection signal to the microprocessor for calculation, which plays the role of isolating interference.
The utility model discloses when specifically using, adopt infrared temperature sensor J1 to detect the temperature in the fluid passage, the design is selected the amplifier circuit frequently and is carried out the processing of enlargiing fast to infrared temperature sensor J1's output signal, utilizes LC filtering to select the principle of frequently to eliminate the clutter interference simultaneously, effectively improves the accuracy of temperature-detecting signal, then puts the in-process at fortune and adds the capacitance compensation, guarantees that the temperature-detecting signal exports effectively the reduction system error steadily in succession. The reference isolation circuit improves the calculation processing precision of the microprocessor on the temperature detection signal data and plays a role in isolating interference. Through the processing to the temperature detection signal, the response speed and the anti-interference performance of the gas flowmeter are effectively improved, the detection result of the gas flowmeter is more accurate, and the reading is more stable.
The above description is provided for further details of the present invention with reference to the specific embodiments, which should not be construed as limiting the present invention; to the utility model discloses affiliated and relevant technical field's technical personnel are based on the utility model discloses under the technical scheme thinking prerequisite, the extension of doing and the replacement of operating method, data all should fall within the utility model discloses within the protection scope.
Claims (4)
1. The utility model provides a gas flowmeter temperature-detecting device, includes temperature sensor, signal processing unit and microprocessor, its characterized in that: the temperature sensor is the infrared temperature sensor J1 who sets up in fluid passage, signal processing unit includes frequency-selecting amplifier circuit and benchmark isolating circuit, infrared temperature sensor J1's signal output part is connected to frequency-selecting amplifier circuit's input, frequency-selecting amplifier circuit's output is connected benchmark isolating circuit's input, benchmark isolating circuit's output is connected microprocessor.
2. The gas flowmeter temperature detection device according to claim 1, wherein: the frequency-selecting amplifying circuit comprises triodes Q1 and Q2, the base electrode of a triode Q1 is connected with the signal output end of the infrared temperature sensor through a capacitor C1 and is grounded through a resistor R1, the collector electrode of a triode Q1 is connected with a +5V power supply and one end of a capacitor C2 through an inductor L1, the emitter electrode of the triode Q1 is connected with the base electrode of a triode Q2, the collector electrode of the triode Q2 is connected with the other end of the capacitor C2 through a resistor R2, and the emitter electrode of a triode Q2 is grounded.
3. The gas flowmeter temperature detection device according to claim 2, wherein: the frequency-selecting amplifying circuit further comprises an operational amplifier AR1, wherein the non-inverting input end of the operational amplifier AR1 is connected with the collector of the triode Q2 through a capacitor C3, and is connected with the output end of the operational amplifier AR1 through a resistor R3 and a capacitor C4 which are connected in parallel, and the inverting input end of the operational amplifier AR1 is grounded.
4. The gas flowmeter temperature detection device according to claim 3, wherein: the reference isolation circuit comprises an operational amplifier AR2, wherein the non-inverting input end of the operational amplifier AR2 is connected with one end of a resistor R4 and one end of a resistor R5 and the output end of an operational amplifier AR1 through a capacitor C5, the other end of the resistor R4 is connected with a +5V power supply, the other end of the resistor R5 is grounded, and the inverting input end of the operational amplifier AR2 is connected with the output end of the operational amplifier AR2 and the input end of the microprocessor through a resistor R6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921722954.8U CN210375233U (en) | 2019-10-15 | 2019-10-15 | Gas flowmeter temperature-detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921722954.8U CN210375233U (en) | 2019-10-15 | 2019-10-15 | Gas flowmeter temperature-detecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210375233U true CN210375233U (en) | 2020-04-21 |
Family
ID=70256330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921722954.8U Active CN210375233U (en) | 2019-10-15 | 2019-10-15 | Gas flowmeter temperature-detecting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210375233U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111642375A (en) * | 2020-06-16 | 2020-09-11 | 张艳枝 | Greening irrigation control system |
-
2019
- 2019-10-15 CN CN201921722954.8U patent/CN210375233U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111642375A (en) * | 2020-06-16 | 2020-09-11 | 张艳枝 | Greening irrigation control system |
| CN111642375B (en) * | 2020-06-16 | 2021-10-29 | 张艳枝 | Greening irrigation control system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN210375233U (en) | Gas flowmeter temperature-detecting device | |
| CN103913249A (en) | Temperature monitoring circuit device and method | |
| CN200941093Y (en) | Probe-type capacity sensor for thickness measurement | |
| CN103293566B (en) | Signal detection circuit of atmospheric ozone sonde | |
| CN213274404U (en) | Thermal gas mass flowmeter | |
| CN214793542U (en) | Calorimeter detection and inspection device | |
| CN212082472U (en) | Precision type intelligent vortex shedding flowmeter | |
| CN216117610U (en) | Lubricating oil parameter detection device capable of simulating high temperature and high pressure | |
| CN213274383U (en) | High-precision gas turbine flowmeter | |
| CN213209151U (en) | High-precision electromagnetic flowmeter | |
| CN213902484U (en) | Constant force bar flowmeter | |
| CN210346783U (en) | Electromagnetic flowmeter | |
| CN213209146U (en) | Gas turbine flowmeter | |
| CN218097871U (en) | Vortex street flowmeter | |
| CN106248156B (en) | wide-range gas flow measuring circuit with low power consumption and self-diagnosis | |
| CN210638754U (en) | Intelligent gas waist wheel flowmeter | |
| CN212179985U (en) | High-temperature electromagnetic flowmeter | |
| CN216668834U (en) | Electromagnetic flowmeter | |
| CN106679738A (en) | Low-power-consumption gas flow measurement circuit with self-diagnosis function | |
| CN215984689U (en) | High-precision gas turbine flowmeter | |
| CN213515798U (en) | High-pump pressure type precession vortex flowmeter | |
| CN221688643U (en) | Filter circuit and pressure sensor thereof | |
| CN210464573U (en) | Thermal gas mass flow meter | |
| CN212110145U (en) | Pressure-stabilizing compensation type vortex shedding flowmeter | |
| CN205373791U (en) | Mass flow meter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |