CN218097884U

CN218097884U - Gas ultrasonic flowmeter

Info

Publication number: CN218097884U
Application number: CN202120447506.2U
Authority: CN
Inventors: 李亚威
Original assignee: Henan Tianxin Instrument Co ltd
Current assignee: Henan Tianxin Instrument Co ltd
Priority date: 2021-03-02
Filing date: 2021-03-02
Publication date: 2022-12-20
Anticipated expiration: 2031-03-02

Abstract

The utility model discloses a gaseous ultrasonic flowmeter, including ultrasonic transducer and microprocessor, still include ultrasonic signal processing unit, ultrasonic signal processing unit includes leading amplifier circuit and stable regulating circuit, the utility model discloses carry out signal enhancement processing in sending ultrasonic transducer's detected signal into leading amplifier circuit at first, improve the detected signal and enlarge output waveform, stable regulating circuit has very good stabilizing effect to detected signal amplification output waveform, adjusts the processing through the detected signal to ultrasonic transducer, fine suppression external interference signal promotes signal transmission's stability and the accuracy that detects.

Description

Gas ultrasonic flowmeter

Technical Field

The utility model relates to a flowmeter technical field especially relates to a gaseous ultrasonic flowmeter.

Background

The ultrasonic gas flowmeter is a process control instrument for detecting and measuring gas flow by using the principle of ultrasonic velocity difference method. One or more pairs of ultrasonic transducers are arranged on a measuring pipe section of the flowmeter, the ultrasonic transducers alternately transmit and receive ultrasonic waves, and the gas flow rate and the gas flow under the standard state are calculated by measuring the sound velocity difference of the ultrasonic waves propagating along the forward direction and the reverse direction of the gas flow and measuring the fluid pressure and temperature of the pipe section including the gas mole component by adopting the ultrasonic detection technology. In the measurement process of the ultrasonic flowmeter, although a lot of error correction is added, the detection signal is still unstable and has deviation in the transmission process due to external interference, and the detection precision is influenced.

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 is directed to a gas ultrasonic flowmeter.

The technical scheme for solving the problem is as follows: gaseous ultrasonic flowmeter, including ultrasonic transducer and microprocessor, still include ultrasonic signal processing unit, ultrasonic signal processing unit includes leading amplifier circuit and stable regulating circuit, leading amplifier circuit's input is connected ultrasonic transducer's signal output part, leading amplifier circuit's output is connected stable regulating circuit's input, stable regulating circuit's output is connected microprocessor.

Further, the preamplification circuit comprises an operational amplifier AR1, an inverting input end of the operational amplifier AR1 is connected with a signal output end of the ultrasonic transducer through a resistor R1 and is grounded through a resistor R2 and a capacitor C1 which are connected in parallel, a non-inverting input end of the operational amplifier AR1 is grounded through a resistor R3, and an output end of the operational amplifier AR1 is connected with an inverting input end of the operational amplifier AR1 through a capacitor C2.

Further, it includes MOS pipe Q1 and triode T1 to stabilize regulating circuit, MOS pipe Q1's drain electrode passes through resistance R4 and connects fortune put the output of ware AR1 and triode T1's collecting electrode to connect MOS pipe Q1's grid and zener diode DZ 1's negative pole through resistance R5, zener diode DZ 1's positive pole ground connection, MOS pipe Q1's source electrode passes through resistance R6 and connects triode T1's base, triode T1's projecting pole passes through resistance R7 connecting resistance R8, electric capacity C3's one end and microprocessor, resistance R8 and electric capacity C3's the other end ground connection that connects in parallel.

Through the technical scheme, the beneficial effects of the utility model are that: the utility model discloses carry out signal enhancement processing in sending into leading amplifier circuit with ultrasonic transducer's detected signal at first, improve the detected signal and enlarge the output waveform, stabilize regulating circuit and enlarge the output waveform to the detected signal and have very good stabilizing effect, adjust the processing through the detected signal to ultrasonic transducer, fine suppression external interference signal promotes signal transmission's stability and the accuracy that detects.

Drawings

Fig. 1 is a schematic circuit diagram of the signal 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.

Gaseous ultrasonic flowmeter includes ultrasonic transducer and microprocessor, still includes ultrasonic signal processing unit, ultrasonic signal processing unit includes leading amplifier circuit and stable regulating circuit, leading amplifier circuit's input is connected ultrasonic transducer's signal output part, leading amplifier circuit's output is connected stable regulating circuit's input, stable regulating circuit's output is connected microprocessor.

The preamplification circuit comprises an operational amplifier AR1, wherein the inverting input end of the operational amplifier AR1 is connected with the signal output end of the ultrasonic transducer through a resistor R1 and is grounded through a resistor R2 and a capacitor C1 which are connected in parallel, the non-inverting input end of the operational amplifier AR1 is grounded through a resistor R3, and the output end of the operational amplifier AR1 is connected with the inverting input end of the operational amplifier AR1 through a capacitor C2.

The stable regulating circuit comprises an MOS (metal oxide semiconductor) tube Q1 and a triode T1, wherein the drain electrode of the MOS tube Q1 is connected with the output end of the operational amplifier AR1 and the collector electrode of the triode T1 through a resistor R4, the grid electrode of the MOS tube Q1 and the cathode of a voltage stabilizing diode DZ1 are connected through a resistor R5, the anode of the voltage stabilizing diode DZ1 is grounded, the source electrode of the MOS tube Q1 is connected with the base electrode of the triode T1 through a resistor R6, the emitting electrode of the triode T1 is connected with one end of a resistor R8, one end of a capacitor C3 and the microprocessor through a resistor R7, and the other ends of the resistor R8 and the capacitor C3 are grounded in parallel.

The utility model discloses a concrete theory of operation does: the detection signal of the ultrasonic transducer is firstly sent into a pre-amplification circuit for signal enhancement processing, wherein an RC filter is formed by a resistor R1 and a capacitor C1 to reduce noise of the detection signal, the signal is pre-amplified by an operational amplifier AR1, and a capacitor C2 plays a role in integral compensation in the operational amplification process to improve the amplification output waveform of the detection signal. The MOS tube Q1 in the stable regulating circuit is used for carrying out amplitude stabilization processing on an output signal of the operational amplifier AR1, wherein the voltage stabilizing diode DZ1 plays a reference role in grid voltage of the MOS tube Q1, and therefore stability of the output signal of the MOS tube Q1 is effectively improved. The output signal of the MOS tube Q1 provides a breakover voltage for the base electrode of the triode T1 through the resistor R6, the triode T1 is ensured to be always in a good working stable state, the triode T1 is ensured to have a good stabilizing effect on the amplified output waveform of the detection signal, the detection signal is sent into the microprocessor after RC filtering, the microprocessor carries out waveform analysis on the processed detection signal and then calculates the sound velocity difference, and then calculates the gas flow velocity and the gas flow under a standard state. The utility model discloses a detection signal to ultrasonic transducer adjusts the processing, fine suppression external disturbance signal, promotes signal transmission's stability and the accuracy that detects.

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

1. Gaseous ultrasonic flowmeter, including ultrasonic transducer and microprocessor, its characterized in that: still include ultrasonic signal processing unit, ultrasonic signal processing unit includes preamplifier circuit and stable regulating circuit, preamplifier circuit's input is connected ultrasonic transducer's signal output part, preamplifier circuit's output is connected stable regulating circuit's input, stable regulating circuit's output is connected microprocessor.

2. The ultrasonic gas flowmeter of claim 1, wherein: the preamplification circuit comprises an operational amplifier AR1, the inverting input end of the operational amplifier AR1 is connected with the signal output end of the ultrasonic transducer through a resistor R1 and is grounded through a resistor R2 and a capacitor C1 which are connected in parallel, the non-inverting input end of the operational amplifier AR1 is grounded through a resistor R3, and the output end of the operational amplifier AR1 is connected with the inverting input end of the operational amplifier AR1 through a capacitor C2.

3. A gas ultrasonic flow meter according to claim 2, wherein: the stable regulating circuit comprises an MOS tube Q1 and a triode T1, the drain electrode of the MOS tube Q1 is connected with the output end of the operational amplifier AR1 and the collector electrode of the triode T1 through a resistor R4, the grid electrode of the MOS tube Q1 and the cathode of a voltage stabilizing diode DZ1 are connected through a resistor R5, the anode of the voltage stabilizing diode DZ1 is grounded, the source electrode of the MOS tube Q1 is connected with the base electrode of the triode T1 through a resistor R6, the emitting electrode of the triode T1 is connected with one end of a resistor R8, one end of a capacitor C3 and the microprocessor through a resistor R7, and the other ends of the resistor R8 and the capacitor C3 are grounded in parallel.