CN212110145U - Pressure-stabilizing compensation type vortex shedding flowmeter - Google Patents
Pressure-stabilizing compensation type vortex shedding flowmeter Download PDFInfo
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- CN212110145U CN212110145U CN202021111249.7U CN202021111249U CN212110145U CN 212110145 U CN212110145 U CN 212110145U CN 202021111249 U CN202021111249 U CN 202021111249U CN 212110145 U CN212110145 U CN 212110145U
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Abstract
The utility model discloses a steady voltage compensation type vortex shedding flowmeter, including amplifying compensating circuit and filtering stabilizing circuit, amplifying compensating circuit includes fortune ware AR1, carries out flow detection to the fluid that flows through in the vortex shedding flowmeter through flow sensor, and its detected signal is sent into fortune ware AR1 after RC filters and is carried out cophase proportion and enlargies to application resistance-capacitance feedback compensation principle in the amplification process, in time compensate the change volume of signal when the external environment appears changing, guarantee the stability that the signal was enlarged, reduce system error; the filter stabilizing circuit utilizes LC filtering principle to carry out accurate filtering to MOS pipe Q1's output signal, has greatly improved flow detection's accuracy, utilizes voltage follower principle to handle in sending into the singlechip with flow detection signal stability, and flow detection accuracy is high.
Description
Technical Field
The utility model relates to a flowmeter technical field especially relates to a steady voltage offset type vortex shedding flowmeter.
Background
The vortex shedding flowmeter is a volume flowmeter which is produced according to Karman vortex shedding principle and is used for measuring the volume flow, standard condition volume flow or mass flow of gas, steam or liquid, and is widely applied to metering and controlling superheated steam, saturated steam, compressed air, general gas, water and liquid in the industries of petroleum, chemical engineering, metallurgy, heating power, textile, paper making and the like. Because the volumes of saturated steam and superheated steam are greatly influenced by temperature and pressure, the vortex shedding flowmeter firstly determines the working parameters of the steam, namely the temperature and the pressure when in work, determines the density of the steam in a working state according to the working parameters, and calculates the density as the unique density of the steam in the future flow measurement process by using the density as a pore plate, so that the actual change of the steam is not compensated or corrected any more in work, and the parameters deviate to some extent even greatly under the actual working condition, thereby causing large deviation of the measurement result.
So the utility model provides a new scheme to solve the problem.
SUMMERY OF THE UTILITY MODEL
In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a stable pressure compensation vortex shedding flowmeter.
The technical scheme for solving the problem is that the voltage-stabilizing compensation type vortex shedding flowmeter comprises an amplification compensation circuit and a filtering stabilizing circuit, wherein the amplification compensation circuit comprises an operational amplifier AR1, the in-phase input end of the operational amplifier AR1 is connected with the signal output end of a flow sensor through a resistor R1 and is grounded through a resistor R3, a resistor R4 and a capacitor C2 which are connected in parallel are connected between the anti-phase input end and the output end of the operational amplifier AR2, and the output signal of the operational amplifier AR1 is processed by the filtering stabilizing circuit and then sent into a single chip microcomputer to calculate the flow value.
Preferably, the filter stabilizing circuit comprises a MOS tube Q1, a gate of the MOS tube Q1 is connected to an output end of the operational amplifier AR1, a drain of the MOS tube Q1 is connected to a +5V power supply, a source of the MOS tube Q1 is connected to one end of a resistor R5 and an end of an inductor L1, the other end of the inductor L1 is connected to one end of a resistor R6, one end of a capacitor C3, a cathode of a zener diode DZ1 and a non-inverting input end of the operational amplifier AR2, the other end of the resistor R6 is connected to the +5V power supply, the other ends of the resistor R5 and the capacitor C3 and an anode of the zener diode DZ1 are grounded in parallel, and an inverting input end of the operational amplifier AR 68623 is connected to an output end of the.
Preferably, the non-inverting input terminal of the opamp AR1 is further grounded through a resistor R2 and a capacitor C1 connected in parallel.
Through the technical scheme, the beneficial effects of the utility model are that:
1. the utility model discloses a flow sensor carries out flow detection to the fluid that flows through in the vortex flowmeter, and its detected signal sends into and transports the ware AR1 to carry out the cophase proportion and enlargies after RC filters to application resistance-capacitance feedback compensation principle in the amplification process, in time compensates the variable quantity of signal when the external environment appears changing, guarantees the stability that the signal enlargies, reduces the system error;
2. the filter stabilizing circuit utilizes LC filtering principle to carry out accurate filtering to MOS pipe Q1's output signal, has greatly improved flow detection's accuracy, utilizes voltage follower principle to handle in sending into the singlechip with flow detection signal stability, and flow detection accuracy is high.
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 utility model provides a steady voltage compensation type vortex shedding flowmeter, including amplifying compensating circuit and filtering stabilizing circuit, amplifying compensating circuit includes fortune ware AR1, fortune ware AR 1's homophase input end passes through resistance R1 and connects flow sensor's signal output end to through resistance R3 ground connection, fortune ware AR 2's inverting input end, be connected with parallelly connected resistance R4 between the output, electric capacity C2, fortune ware AR 1's output signal is sent into the singlechip after filtering stabilizing circuit handles and calculates the flow value.
Flow sensor carries out flow detection to the fluid in the vortex flowmeter of flowing through to convert the signal of telecommunication output into, this signal of telecommunication is sent into at first and is enlargied in fortune ware AR1, fortune ware AR1 utilizes the homophase proportion to enlarge the principle and has improved flow monitoring signal intensity fast, resistance R4, electric capacity C2 plays the effect of resistance-capacitance feedback compensation at fortune in-process of enlargiing, in time compensate the change volume of signal when external environment appears changing, guarantee the stability that the signal was enlargied, reduce system error. The non-inverting input end of the operational amplifier AR1 is grounded through a resistor R2 and a capacitor C1 which are connected in parallel, and the resistor R2 and the capacitor C1 form RC filtering to perform noise reduction processing on the output signal of the flow sensor, so that the accuracy of external noise interference detection is reduced.
The output signal of the operational amplifier AR1 is sent to the filter stabilizing circuit for further processing, the filter stabilizing circuit comprises an MOS tube Q1, the grid of the MOS tube Q1 is connected with the output end of the operational amplifier AR1, the drain of the MOS tube Q1 is connected with a +5V power supply, the source of the MOS tube Q1 is connected with a resistor R5 and one end of an inductor L1, the other end of the inductor L1 is connected with a resistor R6, one end of a capacitor C3, the cathode of a voltage stabilizing diode DZ1 and the non-inverting input end of the operational amplifier AR2, the other end of the resistor R6 is connected with the +5V power supply, the other ends of the resistor R5 and the capacitor C3 and the anode of the voltage stabilizing diode DZ1 are grounded in parallel, and the inverting input end of the operational amplifier AR2 is connected with the output.
In the working process of the filter stabilizing circuit, the MOS tube Q1 utilizes the good temperature characteristic thereof to improve the waveform of the output signal of the operational amplifier AR1, and the influence of the external temperature change on the detection is reduced. Then the LC filtering formed by inductor L1 and capacitor C3 carries out accurate filtering on the output signal of MOS pipe Q1, greatly improves the accuracy of flow detection, voltage stabilizing diode DZ1 plays the role of voltage stabilization on the signal after LC filtering, and finally, the operational amplifier AR2 uses the voltage follower principle to stably send the flow detection signal into the single chip microcomputer for processing, thereby avoiding the electric interference to the work of the single chip microcomputer.
The utility model discloses when specifically using, flow sensor carries out flow measurement to the fluid in the vortex flowmeter of flowing through, and its detected signal is sent into after RC filtering and is carried out the cophase proportion and enlarge in the ware AR1 is put to the fortune to application resistance-capacitance feedback compensation principle in the amplification process, in time compensate the variable quantity of signal when the change appears in external environment, the stability that the assurance signal was enlarged, reduce system error. The filter stabilizing circuit utilizes LC filtering principle to carry out accurate filtering to MOS pipe Q1's output signal, has greatly improved flow detection's accuracy, utilizes voltage follower principle with stable the sending into singlechip of flow detection signal and handles, the singlechip with the detected signal after AD converts the digital quantity into, utilize ripe FFT's spectral analysis technique, obtain vortex street flow signal frequency through amplitude comparison, the flow detection accuracy is high.
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 (3)
1. The utility model provides a steady voltage compensation type vortex shedding flowmeter, includes the compensating circuit and the filter stabilizing circuit of enlargiing, its characterized in that: the amplification compensation circuit comprises an operational amplifier AR1, the non-inverting input end of the operational amplifier AR1 is connected with the signal output end of the flow sensor through a resistor R1 and is grounded through a resistor R3, a resistor R4 and a capacitor C2 which are connected in parallel are connected between the inverting input end and the output end of the operational amplifier AR2, and the output signal of the operational amplifier AR1 is processed by a filter stabilizing circuit and then sent to a single chip microcomputer to calculate the flow value.
2. The pressure-stabilizing compensation type vortex shedding flowmeter according to claim 1, wherein: the filter stabilizing circuit comprises an MOS tube Q1, the grid electrode of the MOS tube Q1 is connected with the output end of the operational amplifier AR1, the drain electrode of the MOS tube Q1 is connected with a +5V power supply, the source electrode of the MOS tube Q1 is connected with a resistor R5 and one end of an inductor L1, the other end of the inductor L1 is connected with a resistor R6, one end of a capacitor C3, the cathode of a voltage stabilizing diode DZ1 and the non-inverting input end of the operational amplifier AR2, the other end of the resistor R6 is connected with the +5V power supply, the other ends of the resistor R5 and a capacitor C3 and the anode of the voltage stabilizing diode DZ1 are grounded in parallel, and the inverting input end of the operational amplifier AR2 is connected with the output end of the.
3. The pressure-stabilizing compensation type vortex shedding flowmeter according to claim 1 or 2, wherein: the non-inverting input terminal of the operational amplifier AR1 is also grounded through a resistor R2 and a capacitor C1 connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021111249.7U CN212110145U (en) | 2020-06-16 | 2020-06-16 | Pressure-stabilizing compensation type vortex shedding flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021111249.7U CN212110145U (en) | 2020-06-16 | 2020-06-16 | Pressure-stabilizing compensation type vortex shedding flowmeter |
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| Publication Number | Publication Date |
|---|---|
| CN212110145U true CN212110145U (en) | 2020-12-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021111249.7U Active CN212110145U (en) | 2020-06-16 | 2020-06-16 | Pressure-stabilizing compensation type vortex shedding flowmeter |
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| Country | Link |
|---|---|
| CN (1) | CN212110145U (en) |
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2020
- 2020-06-16 CN CN202021111249.7U patent/CN212110145U/en active Active
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