CN212082472U - Precision type intelligent vortex shedding flowmeter - Google Patents
Precision type intelligent vortex shedding flowmeter Download PDFInfo
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- CN212082472U CN212082472U CN202020807920.5U CN202020807920U CN212082472U CN 212082472 U CN212082472 U CN 212082472U CN 202020807920 U CN202020807920 U CN 202020807920U CN 212082472 U CN212082472 U CN 212082472U
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Abstract
The utility model discloses an accurate intelligent vortex street flowmeter, including flow sensor, signal processing unit and singlechip, the signal processing unit includes amplifying and regulating circuit and filtering and isolating circuit, and flow sensor detects the fluid flow who flows through in the vortex street flowmeter to send the detected signal into amplifying and regulating circuit at first and amplify, and the complex transport and placing ware that transport and placing ware U2, U3 formed effectively prevents the signal amplification imbalance, guarantees the stability that the detected signal amplifies, reduces the flow detection error, filtering and isolating circuit; the amplified signal is subjected to low-pass filtering by utilizing LC filtering, so that high-frequency and other clutter frequency interference in the detection signal is well eliminated, the filtering is simple and thorough, the detection signal is isolated and input into a single chip microcomputer by utilizing a voltage follower principle, the detection signal is subjected to spectrum analysis based on FFT after being converted into digital quantity through A/D, the vortex street flow signal frequency is obtained through amplitude comparison, the flow detection is accurate and stable, and the anti-interference capability is strong.
Description
Technical Field
The utility model relates to a flowmeter technical field especially relates to an accurate type intelligence vortex flowmeter.
Background
The vortex shedding flowmeter is a volumetric flowmeter which is produced according to Karman vortex shedding principle and used for measuring the volume flow, standard condition volume flow or mass flow of gas, steam or liquid. Because the temperature characteristic of the vortex flow sensor is poor, the measurement error of the flowmeter is larger and larger along with the rise of the temperature, aiming at the phenomenon, the invention patent with the patent name of high temperature resistant digital two-wire HART intelligent vortex flow meter and the application number of 201510504920.1, the technical scheme regulates the output signal of the flow sensor by designing a two-stage charge amplifier and a signal conditioning circuit of two-stage low-pass filters, thereby realizing the purpose of eliminating the error. However, the charge amplifier is prone to generate an offset phenomenon when amplifying the detection signal of the flow sensor, and high-frequency interference in the detection signal is also amplified, which results in complex post-stage filtering, undesirable filtering effect, and high error 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 an accurate intelligent vortex shedding flowmeter.
The technical scheme for solving the problem is as follows: a precise intelligent vortex shedding flowmeter comprises a flow sensor, a signal processing unit and a single chip microcomputer, wherein the signal processing unit comprises an amplification regulating circuit and a filtering isolation circuit, the amplification regulating circuit comprises an operational amplifier U1, U2 and U3, and after an output signal of the flow sensor is amplified in an in-phase proportion by the operational amplifier U1, a composite operational amplifier formed by the operational amplifier U2 and the U3 carries out feedback regulation and amplification on an output signal of an operational amplifier U1; the filtering isolation circuit comprises an operational amplifier U4, and after the output signal of the amplification regulating circuit is processed by an LC filtering circuit, the detection signal is isolated and input into an A/D conversion interface of the singlechip by the operational amplifier U4 by utilizing the principle of a voltage follower.
Furthermore, the positive output end of the flow sensor is connected with one end of a capacitor C1 and the non-inverting input end of an operational amplifier U1, the negative output end of the flow sensor is grounded, the inverting input end of the operational amplifier U1 is connected with one end of a resistor R1 and one end of a resistor R2, the other end of the resistor R1 is grounded, and the other end of the resistor R2 is connected with the output end of the operational amplifier U1.
Further, the non-inverting input end of the operational amplifier U2 is connected to one end of a resistor R3 and one end of a capacitor C2, the other end of the resistor R3 is grounded, the other end of the capacitor C2 is connected to the output end of the operational amplifier U1, the inverting input end of the operational amplifier U2 is connected to one end of resistors R4 and R5 and the non-inverting input end of the operational amplifier U3, the output end of the operational amplifier U2 is connected to the other end of the resistor R4 and the input end of the filter isolation circuit, the other end of the resistor R5 is grounded, the inverting input end and the output end of the operational amplifier U3 are sequentially connected to one end of resistors R7 and R8 through a resistor R6 and a capacitor C3, the other end of the resistor R7 is grounded, and the other end.
Furthermore, the LC filter circuit comprises an inductor L1, one end of the inductor L1 is connected with one ends of resistors R9 and R10, the other end of the resistor R9 is connected with the output end of the operational amplifier U2, the other end of the resistor R10 is connected with one end of a capacitor C5, the other end of the capacitor C5 is connected with the other end of the inductor L1 and one end of a capacitor C4 through a resistor R11, and the other end of the capacitor C4 is grounded.
Further, a response circuit is further arranged between the LC filter circuit and the operational amplifier U4, the response circuit includes an adjustable resistor RP1 and a capacitor C6, one end of the adjustable resistor RP1 is connected to the other end of the resistor R10, the other end of the adjustable resistor RP1 is connected to one end of the capacitor C6 and the non-inverting input end of the operational amplifier U4, and the other end of the capacitor C6 is grounded.
Through the technical scheme, the beneficial effects of the utility model are that:
1. the flow sensor P1 detects the flow of the fluid flowing through the vortex flowmeter, and the detection signal is firstly sent to the amplification regulating circuit for amplification, the composite operational amplifier formed by the operational amplifiers U2 and U3 effectively prevents the signal amplification from being disordered, ensures the stability of the detection signal amplification and reduces the flow detection error;
the LC filter circuit performs low-pass filtering on the amplified signal, so that high-frequency and other clutter frequency interference in the detection signal is well eliminated, and filtering is simple and thorough;
3. the detection signal is input into the single chip microcomputer in an isolated mode by utilizing the voltage follower principle, the detection signal is subjected to spectrum analysis based on FFT after being converted into digital quantity through A/D, the vortex street flow signal frequency is obtained through amplitude comparison, flow detection is accurate and stable, and the anti-interference capability is strong.
Drawings
Fig. 1 is a schematic diagram of the amplifying and adjusting circuit of the present invention.
Fig. 2 is the schematic diagram of the filter 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 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 smart vortex shedding flowmeter of accurate type, including flow sensor P1, signal processing unit and singlechip, signal processing unit includes the adjusting circuit that amplifies and filter the isolation circuit, the adjusting circuit that amplifies includes fortune ware U1, U2, U3, fortune ware U1 carries out the homophase proportion to flow sensor P1's output signal and amplifies the back, the compound fortune ware that is formed by fortune ware U2, U3 carries out feedback regulation and amplification to fortune ware U1's output signal. The filtering isolation circuit comprises an operational amplifier U4, and after the output signal of the amplification regulating circuit is processed by an LC filtering circuit, the detection signal is isolated and input into an A/D conversion interface of the singlechip by the operational amplifier U4 by utilizing the principle of a voltage follower.
As shown in fig. 1, a detection signal of the flow sensor P1 is first sent to the operational amplifier U1 for preliminary in-phase proportional amplification, a positive output terminal of the flow sensor P1 is connected to one end of a capacitor C1 and a non-positive input terminal of the operational amplifier U1, a negative output terminal of the flow sensor P1 is grounded, an inverting input terminal of the operational amplifier U1 is connected to one ends of resistors R1 and R2, the other end of the resistor R1 is grounded, and the other end of the resistor R2 is connected to an output terminal of the operational amplifier U1.
The non-inverting input end of the operational amplifier U2 is connected with one end of a resistor R3 and one end of a capacitor C2, the other end of the resistor R3 is grounded, the other end of the capacitor C2 is connected with the output end of an operational amplifier U1, the inverting input end of the operational amplifier U2 is connected with one end of resistors R4 and R5 and the non-inverting input end of an operational amplifier U3, the output end of the operational amplifier U2 is connected with the other end of a resistor R4 and the input end of a filter isolation circuit, the other end of the resistor R5 is grounded, the inverting input end and the output end of the operational amplifier U3 are sequentially connected with one end of resistors R7 and R8 through a resistor R6 and a capacitor C3, the other end of the resistor R7 is grounded.
An output signal of the operational amplifier U1 is sent into the operational amplifier U2 for further amplification after being filtered by an RC formed by a capacitor C2 and a resistor R3, and in order to prevent signal amplification imbalance, the operational amplifier U3 is adopted to buffer and amplify a signal at an inverting input end of the U2 and feed the signal back to an non-inverting input end of the operational amplifier U2, so that an input imbalance signal of the operational amplifier is offset, the amplification stability of a detection signal is effectively ensured, and a flow detection error is reduced.
As shown in fig. 2, the LC filter circuit includes an inductor L1, one end of the inductor L1 is connected to one ends of resistors R9 and R10, the other end of the resistor R9 is connected to the output end of the operational amplifier U2, the other end of the resistor R10 is connected to one end of a capacitor C5, the other end of the capacitor C5 is connected to the other end of the inductor L1 and one end of the capacitor C4 through a resistor R11, and the other end of the capacitor C4 is grounded. The LC filter circuit filters the output signal of the operational amplifier U2 by utilizing an LC parallel frequency selection principle, so that high-frequency and other clutter frequency interference in the detection signal is well eliminated, and the filtering is simple and thorough.
A response circuit is further arranged between the LC filter circuit and the operational amplifier U4 and comprises an adjustable resistor RP1 and a capacitor C6, one end of the adjustable resistor RP1 is connected with the other end of the resistor R10, the other end of the adjustable resistor RP1 is connected with one end of the capacitor C6 and the non-inverting input end of the operational amplifier U4, and the other end of the capacitor C6 is grounded. The adjustable resistor RP1 and the capacitor C6 form an RC delay circuit, the resistance value of the adjustable resistor RP1 is adjusted to change the response time of detection, and then the operational amplifier U4 is used for isolating and outputting detection signals to form electrical isolation with the single chip microcomputer, so that the stability of the output of the detection signals is ensured.
The utility model discloses when specifically using, flow sensor P1 detects the fluid flow in the vortex flowmeter to at first sending into amplifying and adjusting circuit with the detected signal and enlargiing, the ware is put in fortune to the complex fortune that U2, U3 formed is put in fortune and is effectively prevented the signal amplification imbalance, guarantees the stability that detected signal enlargies, reduces the flow detection error. And then the LC filter circuit performs low-pass filtering on the amplified signal, so that high-frequency and other clutter frequency interference in the detection signal is well eliminated, and the filtering is simple and thorough. And finally, the detection signal is input into the single chip microcomputer in an isolated mode by utilizing the voltage follower principle, the detection signal is subjected to spectrum analysis based on FFT after being converted into digital quantity through A/D, the frequency of the vortex street flow signal is obtained through amplitude comparison, the flow detection is accurate and stable, 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 (5)
1. The utility model provides a precision type intelligence vortex flowmeter, includes flow sensor, signal processing unit and singlechip, its characterized in that: the signal processing unit comprises an amplification regulating circuit and a filtering isolation circuit, the amplification regulating circuit comprises an operational amplifier U1, U2 and U3, and after the operational amplifier U1 amplifies the output signal of the flow sensor in an in-phase proportion, a composite operational amplifier formed by the operational amplifier U2 and the U3 carries out feedback regulation and amplification on the output signal of the operational amplifier U1; the filtering isolation circuit comprises an operational amplifier U4, and after the output signal of the amplification regulating circuit is processed by an LC filtering circuit, the detection signal is isolated and input into an A/D conversion interface of the singlechip by the operational amplifier U4 by utilizing the principle of a voltage follower.
2. The precision intelligent vortex shedding flowmeter of claim 1, wherein: the positive output end of the flow sensor is connected with one end of a capacitor C1 and the non-inverting input end of an operational amplifier U1, the negative output end of the flow sensor is grounded, the inverting input end of the operational amplifier U1 is connected with one ends of resistors R1 and R2, the other end of the resistor R1 is grounded, and the other end of the resistor R2 is connected with the output end of the operational amplifier U1.
3. The precision intelligent vortex shedding flowmeter of claim 2, wherein: the non-inverting input end of the operational amplifier U2 is connected with one end of a resistor R3 and one end of a capacitor C2, the other end of the resistor R3 is grounded, the other end of the capacitor C2 is connected with the output end of an operational amplifier U1, the inverting input end of the operational amplifier U2 is connected with one end of resistors R4 and R5 and the non-inverting input end of an operational amplifier U3, the output end of the operational amplifier U3 is connected with the other end of a resistor R4 and the input end of the filter isolation circuit, the other end of the resistor R5 is grounded, the inverting input end and the output end of the operational amplifier U3 are sequentially connected with one end of resistors R7 and R8 through a resistor R6 and a capacitor C3, the other end of the resistor R7 is grounded, and the.
4. The precision intelligent vortex shedding flowmeter of claim 3, wherein: the LC filter circuit comprises an inductor L1, one end of the inductor L1 is connected with one ends of resistors R9 and R10, the other end of the resistor R9 is connected with the output end of an operational amplifier U2, the other end of the resistor R10 is connected with one end of a capacitor C5, the other end of the capacitor C5 is connected with the other end of the inductor L1 and one end of a capacitor C4 through a resistor R11, and the other end of the capacitor C4 is grounded.
5. The precision intelligent vortex shedding flowmeter according to any one of claims 1-4, wherein: a response circuit is further arranged between the LC filter circuit and the operational amplifier U4 and comprises an adjustable resistor RP1 and a capacitor C6, one end of the adjustable resistor RP1 is connected with the other end of the resistor R10, the other end of the adjustable resistor RP1 is connected with one end of the capacitor C6 and the non-inverting input end of the operational amplifier U4, and the other end of the capacitor C6 is grounded.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020807920.5U CN212082472U (en) | 2020-05-15 | 2020-05-15 | Precision type intelligent vortex shedding flowmeter |
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| CN202020807920.5U CN212082472U (en) | 2020-05-15 | 2020-05-15 | Precision type intelligent vortex shedding flowmeter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114812764A (en) * | 2021-11-16 | 2022-07-29 | 河南省淇花食用油有限公司 | Oil quantity metering system for filling edible oil |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114812764A (en) * | 2021-11-16 | 2022-07-29 | 河南省淇花食用油有限公司 | Oil quantity metering system for filling edible oil |
| CN114812764B (en) * | 2021-11-16 | 2024-04-30 | 河南省淇花食用油有限公司 | Oil quantity metering system for filling edible oil |
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