CN213902484U - Constant force bar flowmeter - Google Patents
Constant force bar flowmeter Download PDFInfo
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- CN213902484U CN213902484U CN202023073670.6U CN202023073670U CN213902484U CN 213902484 U CN213902484 U CN 213902484U CN 202023073670 U CN202023073670 U CN 202023073670U CN 213902484 U CN213902484 U CN 213902484U
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- differential pressure
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- 230000000087 stabilizing effect Effects 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims description 22
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 abstract description 11
- 230000003750 conditioning effect Effects 0.000 abstract description 7
- 230000003321 amplification Effects 0.000 abstract description 5
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 5
- 230000006641 stabilisation Effects 0.000 abstract description 5
- 238000011105 stabilization Methods 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The utility model discloses a constant force ba flowmeter, including differential pressure transmitter J1 and controller, the detected signal of differential pressure transmitter J1 is sent to the controller after flow signal conditioning unit handles again, and flow signal conditioning unit includes difference operational amplifier circuit and filtering stabilization circuit, and difference operational amplifier circuit utilizes the difference principle of amplification to restrain common mode interference effectively, reduces signal distortion, promotes the detected signal and enlargies the precision; the filtering stabilizing circuit utilizes the good temperature characteristic of the MOS transistor Q1 to process the output signal of the differential operational amplifier circuit, and effectively improves the waveform of the detection signal; the output signal of the triode T1 is filtered by the LC and then sent to the grid of the triode Q1 to form closed-loop feedback, and meanwhile, good filtering capability is guaranteed, the accuracy and stability of the controller for receiving detection signals are guaranteed, the measurement accuracy is high, and the anti-interference capability is strong.
Description
Technical Field
The utility model relates to a flowmeter technical field especially relates to a constant force ba flowmeter.
Background
The constant force bar flowmeter is a novel flowmeter developed by the company on the basis of a strong force bar flowmeter, the structural principle of the flowmeter is consistent with that of the strong force bar flowmeter, namely, the flowmeter adopts the structural design completely conforming to the aerodynamic principle, and is an advanced measuring instrument suitable for measuring the flow of gas, liquid and steam. The product consists of a detection rod, a base, a pressure taking system, a differential pressure transmitter and other matched instruments, and can measure the flow of various fluids under various calibers, pressures and temperatures. Because the differential pressure signal sent by the differential pressure transmitter is greatly influenced by external factors, for example, external high-frequency noise and temperature can cause transmission distortion of the differential pressure signal, thereby reducing the stability of the detection signal and the accuracy of flow detection.
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, the present invention provides a constant force bar flowmeter.
The technical scheme of its solution is, a constant force bar flowmeter, including differential pressure transmitter and controller, differential pressure transmitter's detected signal is sent to the controller again after flow signal conditioning unit handles, flow signal conditioning unit includes difference fortune amplifier circuit and filter stabilization circuit, difference fortune amplifier circuit's input is connected differential pressure transmitter's output, difference fortune amplifier circuit's output is connected filter stabilization circuit's input, filter stabilization circuit's output is connected the controller.
Preferably, the differential operational amplifier circuit comprises an operational amplifier U1, a non-inverting input terminal of an operational amplifier U1 is connected to one end of a pin 1 and a resistor R1 of the differential pressure transmitter and one end of a capacitor C1 through a resistor R2, an inverting input terminal of an operational amplifier U1 is connected to the other end of a pin 2 and a resistor R1 of the differential pressure transmitter and the other end of a capacitor C1 through a resistor R3, an output terminal of an operational amplifier U1 is connected to a pin 3 and one end of a capacitor C2 of a rheostat RP1 through a resistor R4, the pin 2 of the rheostat RP1 is grounded to the other end of the capacitor C2, and a pin 1 of the rheostat RP1 is connected to an output terminal of the operational amplifier U1 and grounded through a resistor R5.
Preferably, the filter stabilizing circuit comprises a MOS transistor Q1, a drain of the MOS transistor Q1 is connected to one end of a capacitor C2, a gate of the MOS transistor Q1 is connected to one end of a capacitor C3 and an end of an inductor L1, a source of the MOS transistor Q1 is connected to one ends of resistors R6 and R7, a collector of a transistor T1, one end of a zener diode DZ1 and the controller, an emitter of the transistor T1 is connected to the other end of the inductor L1, and the other ends of the capacitor C3 and the resistor R7 are connected in parallel with an anode of the zener diode DZ1 and grounded.
Preferably, the controller is a single chip microcomputer with a built-in A/D conversion unit.
Through the technical scheme, the beneficial effects of the utility model are that:
1. the differential operational amplifier circuit effectively inhibits common-mode interference by using a differential amplification principle, reduces signal distortion and improves the amplification precision of detection signals;
2. the filtering stabilizing circuit utilizes the good temperature characteristic of the MOS transistor Q1 to process the output signal of the differential operational amplifier circuit, and effectively improves the waveform of the detection signal;
3. the output signal of the triode T1 is filtered by the LC and then sent to the grid of the triode Q1 to form closed-loop feedback, and meanwhile, good filtering capability is guaranteed, the accuracy and stability of the controller for receiving detection signals are guaranteed, the measurement accuracy is high, and the anti-interference capability is strong.
Drawings
Fig. 1 is a schematic circuit diagram of the flow signal adjusting unit 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 fig. 1. 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 constant force ba flowmeter, includes differential pressure transmitter J1 and controller, and differential pressure transmitter J1's detected signal is sent to the controller again after flow signal conditioning unit handles, and flow signal conditioning unit includes difference operational amplifier circuit and filtering stabilizing circuit, and differential pressure transmitter J1's output is connected to difference operational amplifier circuit's input, and filtering stabilizing circuit's input is connected to difference operational amplifier circuit's output, and filtering stabilizing circuit's output connects the controller.
The differential operational amplifier circuit comprises an operational amplifier U1, wherein the non-inverting input end of the operational amplifier U1 is connected with one end of a pin 1 and a resistor R1 of a differential pressure transmitter J1 through a resistor R2 and one end of a capacitor C1, the inverting input end of the operational amplifier U1 is connected with the other end of a pin 2 and a resistor R1 of the differential pressure transmitter J1 and a capacitor C1 through a resistor R3, the output end of the operational amplifier U1 is connected with a pin 3 and one end of a capacitor C2 of a rheostat RP1 through a resistor R4, the pin 2 of the rheostat RP1 is grounded with the other end of the capacitor C2, and the pin 1 of the rheostat RP1 is connected with the output end of the operational amplifier U1 and is grounded through a resistor R5.
The filter stabilizing circuit comprises a MOS tube Q1, the drain electrode of the MOS tube Q1 is connected with one end of a capacitor C2, the gate electrode of the MOS tube Q1 is connected with one end of a capacitor C3 and one end of an inductor L1, the source electrode of the MOS tube Q1 is connected with one end of a resistor R6 and R7, the collector electrode of a triode T1, one end of a zener diode DZ1 and a controller, the emitter electrode of the triode T1 is connected with the other end of the inductor L1, and the other ends of the capacitor C3 and the resistor R7 are connected with the anode of the zener diode DZ1 in parallel and are grounded.
The utility model discloses when specifically using, differential pressure transmitter J1 detects the differential pressure signal that the inside high pressure chamber of test bar and low pressure chamber exist to convert the signal of telecommunication output to flow signal conditioning unit into. The resistor R1 and the capacitor C1 in the differential operational amplifier circuit form RC filtering to perform low-pass stabilization on an output signal of the differential pressure transmitter J1, external noise interference is reduced, and the output signal is sent to the operational amplifier U1 in a differential mode to be amplified, so that common-mode interference is effectively inhibited, signal distortion is reduced, and amplification precision of a detection signal is improved. The resistance value of the rheostat RP1 can be adjusted to change the resistance of the feedback end of the operational amplifier U1, so that a proper amplification factor is obtained, and the use is more convenient.
The filtering stabilizing circuit utilizes the good temperature characteristic of the MOS transistor Q1 to process the output signal of the differential operational amplifier circuit, and effectively improves the waveform of the detection signal. Then, the triode T1 is conducted to work in a resistor shunt mode, the collector voltage of the triode T1 of the voltage stabilizing diode DZ1 plays a reference role, and the triode T1 is ensured to be in a stable working state. The output signal of the triode T1 is filtered by the LC and then sent to the grid of the triode Q1 to form closed-loop feedback, and meanwhile, good filtering capability is guaranteed, and the accuracy and the stability of the controller for receiving detection signals are guaranteed. The controller selects a singlechip with a built-in A/D conversion unit, and the flow of the fluid is calculated by utilizing the internal data processing technology of the singlechip, so that the measurement precision is high, and the anti-interference capability is strong.
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 constant force bar flowmeter, includes differential pressure transmitter and controller, its characterized in that: the detection signal of the differential pressure transmitter is processed by the flow signal adjusting unit and then transmitted to the controller, the flow signal adjusting unit comprises a differential operational amplifier circuit and a filter stabilizing circuit, the input end of the differential operational amplifier circuit is connected with the output end of the differential pressure transmitter, the output end of the differential operational amplifier circuit is connected with the input end of the filter stabilizing circuit, and the output end of the filter stabilizing circuit is connected with the controller.
2. The constant force bar flowmeter of claim 1, wherein: the differential operational amplifier circuit comprises an operational amplifier U1, wherein the non-inverting input end of the operational amplifier U1 is connected with one end of a pin 1 and a resistor R1 of the differential pressure transmitter and one end of a capacitor C1 through a resistor R2, the inverting input end of the operational amplifier U1 is connected with the other end of a pin 2 and a resistor R1 of the differential pressure transmitter and the other end of a capacitor C1 through a resistor R3, the output end of the operational amplifier U1 is connected with a pin 3 and one end of a capacitor C2 of a rheostat RP1 through a resistor R4, a pin 2 and the other end of the capacitor C2 of the rheostat RP1 are grounded, and a pin 1 of the rheostat RP1 is connected with the output end of the operational amplifier U1 and is grounded through a resistor R5.
3. The constant force bar flowmeter of claim 2, wherein: the filter stabilizing circuit comprises a MOS tube Q1, the drain electrode of the MOS tube Q1 is connected with one end of a capacitor C2, the gate electrode of the MOS tube Q1 is connected with one end of a capacitor C3 and one end of an inductor L1, the source electrode of the MOS tube Q1 is connected with one end of a resistor R6 and R7, the collector electrode of a triode T1, one end of a voltage stabilizing diode DZ1 and the controller, the emitter electrode of the triode T1 is connected with the other end of the inductor L1, and the other ends of the capacitor C3 and the resistor R7 are connected with the anode of the voltage stabilizing diode DZ1 in parallel and are grounded.
4. The constant force bar flowmeter of claim 3, wherein: the controller adopts a singlechip with a built-in A/D conversion unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023073670.6U CN213902484U (en) | 2020-12-19 | 2020-12-19 | Constant force bar flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023073670.6U CN213902484U (en) | 2020-12-19 | 2020-12-19 | Constant force bar flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213902484U true CN213902484U (en) | 2021-08-06 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023073670.6U Active CN213902484U (en) | 2020-12-19 | 2020-12-19 | Constant force bar flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213902484U (en) |
-
2020
- 2020-12-19 CN CN202023073670.6U patent/CN213902484U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A constant force bar flowmeter Effective date of registration: 20231016 Granted publication date: 20210806 Pledgee: Bank of China Limited by Share Ltd. Kaifeng branch Pledgor: Kaifeng Hengman measurement and Control Instrument Co.,Ltd. Registration number: Y2023980061302 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |