CN217058910U - Differential pressure type elbow flowmeter - Google Patents
Differential pressure type elbow flowmeter Download PDFInfo
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- CN217058910U CN217058910U CN202220615631.4U CN202220615631U CN217058910U CN 217058910 U CN217058910 U CN 217058910U CN 202220615631 U CN202220615631 U CN 202220615631U CN 217058910 U CN217058910 U CN 217058910U
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- flowmeter
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- 238000001514 detection method Methods 0.000 claims abstract description 28
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 230000003750 conditioning effect Effects 0.000 claims abstract description 8
- 239000003990 capacitor Substances 0.000 claims description 33
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 abstract description 5
- 230000036039 immunity Effects 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 3
- 230000009124 positive feedback regulation Effects 0.000 abstract description 3
- 230000003321 amplification Effects 0.000 description 11
- 238000003199 nucleic acid amplification method Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 6
- 239000012530 fluid Substances 0.000 description 5
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000009123 feedback regulation Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
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- Measuring Fluid Pressure (AREA)
Abstract
The utility model discloses a differential pressure type elbow flowmeter, including detecting element, signal conditioning module and microprocessor, signal conditioning module is including the difference amplifier circuit, the fortune that connect gradually puts feedback regulating circuit and filtering converting circuit, and the detection signal output end of detecting element is connected to the input of difference amplifier circuit, and filtering converting circuit includes low pass filter and AD converter, and the input of low pass filter passes through the AD converter and connects microprocessor; the utility model utilizes the principle of differential amplifier to enhance the output signal of the detecting element, effectively inhibits common mode interference and avoids generating zero drift; the closed-loop positive feedback regulation principle is utilized to effectively prevent the detection signal from being disordered, and ensure that the amplitude of the output waveform of the detection signal is more stable; the utility model discloses have fine interference immunity, it is quick accurate to differential pressure signal processing, and stability is good, can effectively promote differential pressure formula return bend flowmeter's measurement accuracy.
Description
Technical Field
The utility model relates to a flowmeter technical field especially relates to a differential pressure formula return bend flowmeter.
Background
The differential pressure elbow flowmeter belongs to the category of differential pressure flowmeters like the traditional orifice plate flowmeter, and is different from the orifice plate flowmeter in the way that the elbow flowmeter generates differential pressure, the orifice plate generates differential pressure by using the scaling principle of fluid, and the elbow sensor generates differential pressure by using the inertia principle of fluid. The differential pressure type elbow flowmeter also comprises a pressure leading pipeline and a differential pressure transmitter, wherein the pressure leading pipeline leads out a differential pressure signal to the differential pressure transmitter, the differential pressure transmitter converts the differential pressure signal into a standard signal for output, and in the signal processing process, because the differential pressure signal is very weak, and a large amount of noise can be generated by fluid disturbance in the detection process, the existing differential pressure type elbow flowmeter only generally performs amplification and shaping processing on the detection signal processing process, and the stability of the detection signal can not be ensured in the filtering process, so that the detection precision of the differential pressure type elbow flowmeter is seriously influenced.
So the utility model provides a new scheme solves this 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 differential pressure type elbow flowmeter.
The technical scheme of its solution is, differential pressure formula return bend flowmeter, including detecting element, signal conditioning module and microprocessor, signal conditioning module is including the difference amplifier circuit, the feedback control circuit and the filtering converting circuit that connect gradually, difference amplifier circuit's input is connected detecting element's detected signal output end, filtering converting circuit includes low pass filter and AD converter, low pass filter's input passes through the AD converter is connected microprocessor.
Preferably, the differential amplifier circuit comprises an operational amplifier U1, a non-inverting input terminal of the operational amplifier U1 is connected to one end of a resistor RP1, a sliding terminal and one end of a resistor R2, the other end of the resistor RP1 is grounded through a resistor R4, the other end of the resistor R2 is connected to a resistor R1, one end of a capacitor C1 and a first pressure signal output terminal of the detection element, and an inverting input terminal of the operational amplifier U1 is connected to a resistor R1, the other end of the capacitor C1 and a second pressure signal output terminal of the detection element through a resistor R3.
Preferably, the operational amplifier feedback regulating circuit comprises an operational amplifier U2, a non-inverting input terminal of an operational amplifier U2 is connected with a resistor R5, one end of a capacitor C2 and a drain of a MOS transistor Q1, the other end of a resistor R5 is connected with an output terminal of the operational amplifier U1, an inverting input terminal of the operational amplifier U2 and the other end of the capacitor C2 are grounded, an output terminal of the operational amplifier U2 is connected with an anode of a diode D1 and one end of a capacitor C3 through a resistor R8, a cathode of the diode D1 is connected with a gate of the MOS transistor Q1 through a resistor R6, and a source of the MOS transistor Q1 is connected with the other end of the capacitor C3 and grounded through a resistor R7.
Preferably, the low-pass filter is a pi-type LC filter and includes capacitors C4, C5 and an inductor L1, one end of the capacitor C4 and one end of the inductor L1 are connected to the output end of the operational amplifier U2 through a resistor R9, the other end of the inductor L1 is connected to one end of the capacitor C5 and the a/D converter, and the other ends of the capacitors C4 and C5 are grounded.
Preferably, the microprocessor is an STC89C52 type single chip microcomputer.
Through the technical scheme, the beneficial effects of the utility model are that:
1. the utility model utilizes the principle of differential amplifier to enhance the output signal of the detecting element, thereby effectively inhibiting common mode interference and avoiding zero drift; the operational amplifier feedback adjusting circuit is adopted to carry out secondary amplification on the detection signal, the imbalance of the detection signal is effectively prevented by utilizing the closed-loop positive feedback adjusting principle, and the output waveform amplitude of the detection signal is ensured to be more stable;
2. the utility model discloses have fine interference immunity, it is quick accurate to differential pressure signal processing, and stability is good, can effectively promote differential pressure formula return bend flowmeter's measurement accuracy.
Drawings
Fig. 1 is a schematic circuit diagram 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 differential pressure type elbow flowmeter comprises a detection element, a signal conditioning module and a microprocessor, wherein the signal conditioning module comprises a differential amplification circuit, an operational amplifier feedback regulation circuit and a filtering conversion circuit which are sequentially connected, the input end of the differential amplification circuit is connected with the detection signal output end of the detection element, the filtering conversion circuit comprises a low-pass filter and an A/D converter, and the input end of the low-pass filter is connected with the microprocessor through the A/D converter.
As shown in fig. 1, the differential amplifier circuit includes an operational amplifier U1, a non-inverting input terminal of the operational amplifier U1 is connected to one end of a varistor RP1, a sliding terminal and one end of a resistor R2, the other end of the varistor RP1 is grounded through a resistor R4, the other end of the resistor R2 is connected to a resistor R1, one end of a capacitor C1 and a first pressure signal output terminal of the detection element, and an inverting input terminal of the operational amplifier U1 is connected to the other end of a resistor R1, the other end of a capacitor C1 and a second pressure signal output terminal of the detection element through a resistor R3.
The operational amplifier feedback regulating circuit comprises an operational amplifier U2, wherein the non-inverting input end of the operational amplifier U2 is connected with one end of a resistor R5 and a capacitor C2 and the drain electrode of a MOS transistor Q1, the other end of the resistor R5 is connected with the output end of the operational amplifier U1, the inverting input end of the operational amplifier U2 and the other end of the capacitor C2 are grounded, the output end of the operational amplifier U2 is connected with the anode of a diode D1 and one end of a capacitor C3 through a resistor R8, the cathode of the diode D1 is connected with the gate of the MOS transistor Q1 through a resistor R6, and the source of the MOS transistor Q1 is connected with the other end of the capacitor C3 and is grounded through a resistor R7.
The low-pass filter is a pi-type LC filter and comprises capacitors C4 and C5 and an inductor L1, one ends of the capacitors C4 and the inductor L1 are connected with the output end of an operational amplifier U2 through a resistor R9, the other end of the inductor L1 is connected with one end of the capacitor C5 and the A/D converter, and the other ends of the capacitors C4 and C5 are grounded.
The utility model discloses a concrete theory of operation does: the detection element arranged in the pipeline of the differential pressure type elbow flowmeter detects the pressure at two ends of the elbow and outputs the pressure in the form of an electric signal; the differential amplification circuit amplifies two paths of output signals of the detection element, firstly, an RC (resistor-capacitor) stabilizer consisting of a resistor R1 and a capacitor C1 is used for stabilizing a differential pressure signal, then the differential pressure signal is sent to an operational amplifier U1 for amplification, and the operational amplifier U1 is used for enhancing the detection signal by using the differential amplifier principle, so that common-mode interference is effectively inhibited, and zero drift is avoided;
in order to further prevent the detection signal from being maladjusted in the amplification process, an operational amplifier feedback regulating circuit is adopted to carry out secondary amplification on the detection signal, wherein an operational amplifier U2 serves as a main amplifier, a MOS transistor Q1 serves as a feedback regulating tube, the output signal of the operational amplifier U2 is shunted through a resistor R8, then the output signal is shaped by a diode D1 and then is sent to a MOS transistor Q1 for amplification, and the output signal of the drain electrode of the MOS transistor Q1 is fed back to the non-inverting input end of the operational amplifier U2, so that closed-loop positive feedback regulation is formed, the stability of the amplification gain of the operational amplifier U2 is improved, and the output waveform amplitude of the detection signal is ensured to be more stable; the capacitor C3 has a stabilizing effect on the feedback amplification process, and ensures the stable operation of positive feedback regulation;
the filtering conversion circuit performs low-pass noise reduction on the amplified detection signal by using a pi-type LC filter principle, so that mechanical peak noise generated by fluid disturbance is effectively eliminated; finally, an analog quantity electric signal is converted into a digital quantity signal by an A/D converter and is sent to a microprocessor, and the microprocessor can select an STC89C52 type single chip microcomputer and calculates the fluid flow through internal operation processing; the utility model discloses have fine interference immunity, it is quick accurate to differential pressure signal processing, and stability is good, can effectively promote differential pressure formula return bend flowmeter's measurement accuracy.
The above description is provided for further details of the present invention with reference to 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 (5)
1. Differential pressure formula return bend flowmeter, including detecting element, signal conditioning module and microprocessor, its characterized in that: the signal conditioning module comprises a differential amplifying circuit, an operational amplifier feedback adjusting circuit and a filtering conversion circuit which are sequentially connected, wherein the input end of the differential amplifying circuit is connected with the detection signal output end of the detection element, the filtering conversion circuit comprises a low-pass filter and an A/D converter, and the input end of the low-pass filter is connected with the microprocessor through the A/D converter.
2. The differential pressure elbow flowmeter of claim 1 wherein: the differential amplifying circuit comprises an operational amplifier U1, wherein the non-inverting input end of the operational amplifier U1 is connected with one end of a rheostat RP1, one end of a sliding end of the rheostat RP1 and one end of a resistor R2, the other end of the rheostat RP1 is grounded through a resistor R4, the other end of the resistor R2 is connected with one end of a resistor R1, one end of a capacitor C1 and a first pressure signal output end of the detection element, and the inverting input end of the operational amplifier U1 is connected with the other end of a resistor R1, the other end of the capacitor C1 and a second pressure signal output end of the detection element through a resistor R3.
3. The differential pressure elbow flowmeter of claim 2, wherein: the operational amplifier feedback adjusting circuit comprises an operational amplifier U2, wherein the non-inverting input end of the operational amplifier U2 is connected with one end of a resistor R5 and a capacitor C2 and the drain electrode of a MOS transistor Q1, the other end of the resistor R5 is connected with the output end of the operational amplifier U1, the inverting input end of the operational amplifier U2 and the other end of the capacitor C2 are grounded, the output end of the operational amplifier U2 is connected with the anode of a diode D1 and one end of a capacitor C3 through a resistor R8, the cathode of the diode D1 is connected with the gate of the MOS transistor Q1 through a resistor R6, and the source of the MOS transistor Q1 is connected with the other end of the capacitor C3 and is grounded through a resistor R7.
4. A differential pressure elbow flowmeter according to claim 1 or 3 wherein: the low-pass filter is a pi-type LC filter and comprises capacitors C4, C5 and an inductor L1, one ends of the capacitors C4 and the inductor L1 are connected with the output end of an operational amplifier U2 through a resistor R9, the other end of the inductor L1 is connected with one end of the capacitor C5 and the A/D converter, and the other ends of the capacitors C4 and C5 are grounded.
5. The differential pressure elbow flowmeter of claim 4, wherein: the microprocessor is an STC89C52 type single chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220615631.4U CN217058910U (en) | 2022-03-21 | 2022-03-21 | Differential pressure type elbow flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220615631.4U CN217058910U (en) | 2022-03-21 | 2022-03-21 | Differential pressure type elbow flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217058910U true CN217058910U (en) | 2022-07-26 |
Family
ID=82492007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220615631.4U Active CN217058910U (en) | 2022-03-21 | 2022-03-21 | Differential pressure type elbow flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217058910U (en) |
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2022
- 2022-03-21 CN CN202220615631.4U patent/CN217058910U/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: Differential pressure elbow flowmeter Effective date of registration: 20231016 Granted publication date: 20220726 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 |