CN213274383U - High-precision gas turbine flowmeter - Google Patents
High-precision gas turbine flowmeter Download PDFInfo
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- CN213274383U CN213274383U CN202022326443.3U CN202022326443U CN213274383U CN 213274383 U CN213274383 U CN 213274383U CN 202022326443 U CN202022326443 U CN 202022326443U CN 213274383 U CN213274383 U CN 213274383U
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Abstract
The utility model discloses a gaseous turbine flowmeter of high accuracy, including turbine flow sensor and singlechip, turbine flow sensor's detected signal sends into poor feedback regulating circuit and RC filter circuit in proper order and handles, and the difference is put the difference and is fed back the feedback regulating circuit in and the ware AR1, AR2 of fortune forms differential amplifier and enlargies the detected signal, has restrained common mode signal well; meanwhile, the output signal of the operational amplifier AR2 is subjected to feedback adjustment by the operational amplifier AR3, the offset voltage in the amplification process of the operational amplifier AR2 is eliminated, the offset in the amplification process is avoided, and the device has strong capabilities of inhibiting zero drift and noise and interference; the RC filter circuit filters the output signal of the operational amplifier AR2 by using a pi-type RC filter principle, improves the stability of signal receiving of the single chip microcomputer, and finally sends the signal to the single chip microcomputer for operation processing, so that the accuracy of a measurement result is high, and the anti-interference performance is strong.
Description
Technical Field
The utility model relates to a flowmeter technical field especially relates to high accuracy gas turbine flowmeter.
Background
The gas turbine flowmeter is mainly used for measuring the flow of medium fluids such as air, nitrogen, oxygen, hydrogen, methane, natural gas, steam and the like in an industrial pipeline, and is hardly influenced by parameters such as fluid density, pressure, temperature, viscosity and the like when the working condition volume flow is measured. However, under the condition of a relatively harsh working environment, for example, electromagnetic field interference, dust, high temperature, vibration, moisture, etc., malfunction or failure of the turbine flow sensor may be caused, and a reading error of the turbine flow meter is directly caused, and the error is a positive value or a negative value, which may not be obvious or may completely fail.
So the utility model provides a new scheme to solve the problem.
SUMMERY OF THE UTILITY MODEL
In view of the above, to overcome the shortcomings of the prior art, the present invention is directed to a high-precision gas turbine flowmeter.
The technical scheme includes that the high-precision gas turbine flowmeter comprises a turbine flow sensor and a single chip microcomputer, detection signals of the turbine flow sensor are sequentially sent into a differential feedback adjusting circuit and an RC filter circuit to be processed, differential amplifiers AR1 and AR2 in the differential feedback adjusting circuit form a differential amplifier to amplify the detection signals, meanwhile, an operational amplifier AR3 is used for carrying out feedback adjustment on output signals of an operational amplifier AR2, and offset voltage in the amplification process of the operational amplifier AR2 is eliminated; the RC filter circuit filters the output signal of the operational amplifier AR2 by using a pi-type RC filter principle, and finally sends the filtered output signal into the single chip microcomputer for operation processing.
Furthermore, the differential amplifier feedback adjusting circuit further comprises a resistor R1, one end of the resistor R1 is connected with the signal output end of the turbine flow sensor, the other end of the resistor R1 is connected with one end of a resistor R2 and one end of a capacitor C1, the other end of the capacitor C1 is connected with the non-inverting input end of the operational amplifier AR2, one end of the resistor R2 is connected with the inverting input end of the operational amplifier AR1, the input end of the operational amplifier AR1 is grounded through a resistor R3 and a capacitor C2 which are connected in parallel, the non-inverting input end of the operational amplifier AR1 is grounded through a resistor R4, the output end of the operational amplifier AR1 is connected with the inverting input end of the operational amplifier AR2 through a resistor R5, and is grounded through a capacitor C3, the output terminal of the operational amplifier AR2 is connected with pin 1 of the rheostat RP1, the resistor R6 is connected with the non-inverting input end of the operational amplifier AR3, pins 2 and 3 of the rheostat RP1 are grounded, and the inverting input end and the output end of the operational amplifier AR3 are connected with the non-inverting input end of the operational amplifier AR2 through the resistor R7.
Further, the RC filter circuit includes a resistor R8 and capacitors C4 and C5, one end of the resistor R8 and the capacitor C4 is connected to the output end of the operational amplifier AR2, the other end of the resistor R8 is connected to one end of the capacitor C5 and the single chip, and the other ends of the capacitors C4 and C5 are grounded.
Through the technical scheme, the beneficial effects of the utility model are that:
1. the utility model discloses a turbine flow sensor real-time supervision flowmeter inside medium fluid flow, its detected signal send into difference at first and amplify the processing in broadcasting feedback regulating circuit, and the difference is broadcast feedback regulating circuit and is put ware AR1, AR2 and form differential amplifier and amplify the detected signal, has restrained common mode signal well;
2. the output signal of the operational amplifier AR2 is subjected to feedback regulation by the operational amplifier AR3, the offset voltage in the amplification process of the operational amplifier AR2 is eliminated, the offset in the amplification process is avoided, and the device has strong capabilities of inhibiting zero drift and noise and interference;
and 3, the RC filter circuit filters the output signal of the operational amplifier AR2 by using a pi-type RC filter principle, so that high-frequency clutter interference generated inside or outside the circuit is effectively reduced, and the stability of signal receiving of the single chip microcomputer is improved.
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 high-precision gas turbine flowmeter comprises a turbine flow sensor and a single chip microcomputer, wherein detection signals of the turbine flow sensor are sequentially sent into a differential amplifier feedback adjusting circuit and an RC filter circuit for processing, an operational amplifier AR1 and an operational amplifier AR2 in the differential amplifier feedback adjusting circuit form a differential amplifier for amplifying the detection signals, and an operational amplifier AR3 is adopted for carrying out feedback adjustment on output signals of the operational amplifier AR2 so as to eliminate offset voltage in the amplifying process of the operational amplifier AR 2; the RC filter circuit filters the output signal of the operational amplifier AR2 by using a pi-type RC filter principle, and finally sends the filtered output signal into the single chip microcomputer for operation processing.
The turbine flow sensor is used for detecting the medium fluid flow inside the flowmeter, and the detection signal is firstly sent to a differential feedback regulation circuit for signal enhancement processing, as shown in fig. 1, the differential feedback regulation circuit further comprises a resistor R1, one end of the resistor R1 is connected with the signal output end of the turbine flow sensor, the other end of the resistor R1 is connected with one end of a resistor R2 and one end of a capacitor C1, the other end of the capacitor C1 is connected with the non-inverting input end of an operational amplifier AR2, one end of the resistor R2 is connected with the inverting input end of an operational amplifier AR1 and is grounded through a resistor R3 and a capacitor C2 which are connected in parallel, the non-inverting input end of the operational amplifier AR1 is grounded through a resistor R4, the output end of the operational amplifier AR1 is connected with the inverting input end of the operational amplifier AR2 through a resistor R5 and is grounded through a capacitor C3, the output end of the operational amplifier AR2 is connected with a pin 1 of a rheostat RP 42, pins 2 and 3 of the rheostat RP1 are grounded, and the inverting input end and the output end of the operational amplifier AR3 are connected with the non-inverting input end of the operational amplifier AR2 through a resistor R7.
In the working process of the differential feedback adjusting circuit, a detection signal output by the turbine flow sensor is divided by a resistor R1 and then is input into an operational amplifier AR1 and an operational amplifier AR2 in two paths, wherein one path is coupled by a capacitor C1 and then is input into a non-inverting input end of the operational amplifier AR2, the other path is divided by a resistor formed by resistors R2 and R3 and then is input into an operational amplifier AR1 for amplification, and then is input into an inverting input end of the operational amplifier AR2, so that differential mode signals are formed at two input ends of the operational amplifier AR2, and the capacitors C2 and C3 respectively play a role in filtering and stabilizing input and output signals of the operational amplifier AR 1. The operational amplifier AR2 amplifies the detection signal using the differential amplification principle, and well suppresses the common mode signal. The output signal of the operational amplifier AR2 is shunted by the rheostat RP1 and the resistor R6 and then sent into the operational amplifier AR3, the operational amplifier AR3 carries out voltage following output on the shunted signal flowing through the resistor R6 by applying a voltage follower principle, and the voltage value is fed back to the non-inverting input end of the operational amplifier AR2, so that the operational amplifier offset voltage of the inverting input end of the operational amplifier AR2 is offset, the operational amplifier is prevented from being offset, and the operational amplifier has strong capabilities of inhibiting zero drift and noise and interference. The voltage value is changed by adjusting the resistance value of the rheostat RP1, so that circuit parameters are conveniently adjusted when offset voltages generated aiming at different types of turbine flow sensors are different, and the use is more convenient.
The RC filter circuit comprises a resistor R8 and capacitors C4 and C5, one ends of the resistor R8 and the capacitor C4 are connected with the output end of the operational amplifier AR2, the other end of the resistor R8 is connected with one end of the capacitor C5 and the single chip microcomputer, and the other ends of the capacitors C4 and C5 are grounded. The RC filter circuit filters the output signal of the operational amplifier AR2 by using a pi-type RC filter principle, so that high-frequency clutter interference generated inside or outside the circuit is effectively reduced, and the stability of signal receiving of the single chip microcomputer is improved.
The utility model discloses when specifically using, the inside medium fluid flow of turbine flow sensor real-time supervision flowmeter, its detected signal carries out the signal enhancement processing at first in sending into poor feedback regulating circuit, and the difference is played and is put ware AR1, AR2 formation differential amplifier and enlargies detected signal among the feedback regulating circuit, has suppressed common mode signal well. Meanwhile, the output signal of the operational amplifier AR2 is subjected to feedback adjustment by the operational amplifier AR3, the offset voltage in the amplification process of the operational amplifier AR2 is eliminated, the offset in the amplification process is avoided, and the device has strong capabilities of inhibiting zero drift and noise and interference. The RC filter circuit filters the output signal of the operational amplifier AR2 by using a pi-type RC filter principle, high-frequency clutter interference generated inside or outside the circuit is effectively reduced, the stability of signal receiving of the single chip microcomputer is improved, an accumulated flow value is obtained through internal operation of the single chip microcomputer, the accuracy of a measuring result is high, and the anti-interference performance 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 (3)
1. High accuracy gas turbine flowmeter, including turbine flow sensor and singlechip, its characterized in that: detection signals of the turbine flow sensor are sequentially sent into a differential amplifier feedback adjusting circuit and an RC filter circuit for processing, differential amplifiers AR1 and AR2 in the differential amplifier feedback adjusting circuit form a differential amplifier to amplify the detection signals, meanwhile, an operational amplifier AR3 is adopted to perform feedback adjustment on output signals of an operational amplifier AR2, and offset voltage in the amplification process of the operational amplifier AR2 is eliminated; the RC filter circuit filters the output signal of the operational amplifier AR2 by using a pi-type RC filter principle, and finally sends the filtered output signal into the single chip microcomputer for operation processing.
2. The high accuracy gas turbine flowmeter of claim 1, wherein: the differential amplifier feedback adjusting circuit further comprises a resistor R1, one end of a resistor R1 is connected with a signal output end of the turbine flow sensor, the other end of a resistor R1 is connected with one ends of a resistor R2 and a capacitor C1, the other end of a capacitor C1 is connected with a non-inverting input end of an operational amplifier AR2, one end of the resistor R2 is connected with an inverting input end of an operational amplifier AR1 and is grounded through a resistor R3 and a capacitor C2 which are connected in parallel, the non-inverting input end of the operational amplifier AR1 is grounded through a resistor R4, the output end of the operational amplifier AR1 is connected with the inverting input end of the operational amplifier AR2 through a resistor R5 and is grounded through a capacitor C3, the output end of the operational amplifier AR2 is connected with a pin 1 of a rheostat 1 and is connected with the non-inverting input end of the operational amplifier AR3 through a resistor R6, pins 2 and 3 of the rheostat RP1 are grounded, and the inverting input end and the.
3. The high accuracy gas turbine flowmeter of claim 2, wherein: the RC filter circuit comprises a resistor R8 and capacitors C4 and C5, one ends of the resistor R8 and the capacitor C4 are connected with the output end of the operational amplifier AR2, the other end of the resistor R8 is connected with one end of the capacitor C5 and the single chip microcomputer, and the other ends of the capacitors C4 and C5 are grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022326443.3U CN213274383U (en) | 2020-10-19 | 2020-10-19 | High-precision gas turbine flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022326443.3U CN213274383U (en) | 2020-10-19 | 2020-10-19 | High-precision gas turbine flowmeter |
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| Publication Number | Publication Date |
|---|---|
| CN213274383U true CN213274383U (en) | 2021-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022326443.3U Active CN213274383U (en) | 2020-10-19 | 2020-10-19 | High-precision gas turbine flowmeter |
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|---|---|
| CN (1) | CN213274383U (en) |
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2020
- 2020-10-19 CN CN202022326443.3U patent/CN213274383U/en active Active
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