CN210638754U - Intelligent gas waist wheel flowmeter - Google Patents
Intelligent gas waist wheel flowmeter Download PDFInfo
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- CN210638754U CN210638754U CN201921335760.2U CN201921335760U CN210638754U CN 210638754 U CN210638754 U CN 210638754U CN 201921335760 U CN201921335760 U CN 201921335760U CN 210638754 U CN210638754 U CN 210638754U
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Abstract
The utility model discloses an intelligent gas waist wheel flowmeter, including the integrating instrument, set up microprocessor in the integrating instrument, microprocessor connects the temperature compensation module, the temperature compensation module includes temperature detection circuit, signal conditioning circuit and voltage stabilizing circuit that connect gradually, the utility model discloses temperature-sensing probe BG1 in the temperature detection circuit detects the temperature of flowmeter gas channel in real time, utilizes the good temperature characteristic of MOS pipe to improve the output signal of fortune ware AR1, makes the signal have good output waveform, effectively eliminates the influence of external environment temperature, signal conditioning circuit effectively prevents the temperature detection signal from drifting, improves the precision of temperature detection, voltage stabilizing circuit utilizes triode voltage stabilizing principle to improve the stability of temperature signal, thereby eliminates the temperature sensor when the temperature is detected and is disturbed by the temperature of working terminal and external environment temperature, temperature measurement is accurate and reliable, the compensation effect is good, and the accuracy of the intelligent gas waist wheel flowmeter is effectively ensured.
Description
Technical Field
The utility model relates to a gas flowmeter technical field especially relates to gaseous roots flowmeter of intelligence.
Background
The intelligent gas roots flowmeter is a new-generation flowmeter integrating flow, temperature and pressure detection functions, and its core calculation processing component is an integrating instrument, and said integrating instrument is equipped with temperature detection simulation channel, pressure detection simulation channel, flow sensor channel and microprocessor unit. Since gas is a compressible fluid, the volume value of the gas is closely related to temperature and pressure, in order to unify standards of both parties in trade, the actual volume needs to be converted into the standard volume under the reference condition, and in order to achieve the purpose, the intelligent gas waist wheel flowmeter needs to automatically compensate for the temperature and the pressure so as to correct the volume of the gas. The thermocouple is usually used as a temperature sensing element when temperature measurement is carried out, and because a thermocouple measurement signal is influenced by the temperature of a working end and the temperature of the external environment, a measurement result can have deviation with the actual temperature.
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 utility model aims at providing an intelligent gas waist wheel flowmeter.
The technical scheme for solving the problem is as follows: an intelligent gas waist wheel flowmeter comprises an integrating instrument, a microprocessor is arranged in the integrating instrument and connected with a temperature compensation module, the temperature compensation module comprises a temperature detection circuit, a signal conditioning circuit and a voltage stabilizing circuit which are sequentially connected, the temperature detection circuit comprises a temperature sensing probe BG1, the base and the collector of the temperature sensing probe BG1 are connected with resistors R1 and R2 and one end of a capacitor C1, the other end of a resistor R1 is connected with a +5V power supply, the other end of the capacitor C1 is grounded with the emitter of the temperature sensing probe BG1, one end of a resistor R2 is connected with the non-inverting input end of an operational amplifier AR1, the output end of the operational amplifier AR1 is connected with the grid of an MOS tube Q1, the inverting output end of the operational amplifier AR1 is connected with the source of the MOS tube Q1 and one end of a resistor R4, the other end of the resistor R4 is grounded, and the drain of the MOS tube Q.
Further, the signal conditioning circuit comprises operational amplifiers AR2 and AR3, a non-inverting input terminal of the operational amplifier AR2 is connected to a source of the MOS transistor Q1 through a resistor R5, an inverting input terminal of the operational amplifier AR2 is connected to an inverting input terminal and an output terminal of the operational amplifier AR3, an output terminal of the operational amplifier AR2 is connected to a non-inverting input terminal of the operational amplifier AR3 and one end of the resistor R7 through a resistor R6, the other end of the resistor R7 is grounded, and a capacitor C2 is connected between the non-inverting input terminal and the output terminal of the operational amplifier AR 2.
Further, the voltage stabilizing circuit comprises resistors R8 and R9, one ends of the resistors R8 and R9 are connected with the output end of the operational amplifier AR2, the other end of the resistor R8 is connected with the collector of the triode VT1, the other end of the resistor R9 is connected with the base of the triode VT1, one end of the capacitor C3 and the cathode of the zener diode DZ1, the other end of the capacitor C3 is grounded in parallel with the anode of the zener diode DZ1, and the emitter of the triode VT1 is connected with the input end of the microprocessor and grounded through the resistor R10.
Through the technical scheme, the beneficial effects of the utility model are that:
1. the utility model discloses temperature-sensing probe BG1 detects the temperature of flowmeter gas channel in real time among the temperature-detecting circuit, in order to improve the stability of signal amplification, utilizes the good temperature characteristic of MOS pipe to improve the output signal of fortune ware AR1, makes the signal have good output waveform, effectively eliminates the influence of external environment temperature;
2. the signal conditioning circuit utilizes the operation amplifiers AR2, AR3 to effectively prevent the temperature detection signal from drifting, improves the precision of temperature detection, and the voltage stabilizing circuit utilizes the triode voltage stabilizing principle to improve the stability of the temperature signal sent into the microprocessor, thereby eliminating the interference of the temperature sensor from the temperature of a working end and the temperature of the external environment during temperature detection, ensuring the accuracy of the intelligent gas waist wheel flowmeter and having good compensation effect.
Drawings
Fig. 1 is a block diagram of the present invention.
Fig. 2 is a schematic circuit diagram of the temperature compensation module 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 intelligent gas waist wheel flowmeter comprises an integrating instrument, wherein a microprocessor is arranged in the integrating instrument, and the microprocessor is connected with a temperature compensation module. In order to improve the accuracy of temperature detection of the intelligent gas waist wheel flowmeter, the temperature compensation module comprises a temperature detection circuit, a signal conditioning circuit and a voltage stabilizing circuit which are sequentially connected.
The temperature detection circuit comprises a temperature sensing probe BG1, the base of the temperature sensing probe BG1, a collector connecting resistor R1, R2 and one end of a capacitor C1, the other end of the resistor R1 is connected with a +5V power supply, the other end of the capacitor C1 is grounded with the emitter of the temperature sensing probe BG1, one end of the resistor R2 is connected with the non-inverting input end of an operational amplifier AR1, the output end of the operational amplifier AR1 is connected with the grid of a MOS tube Q1, the inverting output end of the operational amplifier AR1 is connected with the source of the MOS tube Q1 and one end of a resistor R4, the other end of the resistor R4 is grounded, and the drain of the MOS tube Q1 is connected with the + 5V. The emitter voltage of the temperature sensing probe BG1 changes linearly according to the temperature of the gas channel of the flowmeter, namely, the higher the temperature is, the smaller the pressure drop of the temperature sensing probe BG1 is. The capacitor C1 has a voltage stabilizing effect on the output signal of the temperature sensing probe BG1, and then the output signal is sent to the operational amplifier AR1 for amplification, in order to improve the stability of signal amplification, the output signal of the operational amplifier AR1 is improved by utilizing the good temperature characteristic of the MOS tube, so that the signal has a good output waveform, and the influence of the external environment temperature is effectively eliminated.
In order to prevent the temperature detection signal from drifting to influence the detection precision, the output signal of the MOS tube Q1 is sent to a signal conditioning circuit for further processing. The signal conditioning circuit comprises operational amplifiers AR2 and AR3, wherein a non-inverting input end of the operational amplifier AR2 is connected with a source electrode of a MOS transistor Q1 through a resistor R5, an inverting input end of the operational amplifier AR2 is connected with an inverting input end and an output end of the operational amplifier AR3, an output end of the operational amplifier AR2 is connected with a non-inverting input end of the operational amplifier AR3 and one end of a resistor R7 through a resistor R6, the other end of the resistor R7 is grounded, and a capacitor C2 is connected between the non-inverting input end and the output end of the operational amplifier AR 2. In order to eliminate the signal drift amount of the non-inverting input end of the operational amplifier AR2, the output signal of the operational amplifier AR2 is divided by resistors R6 and R7 and then sent into the operational amplifier AR3 for follow-up amplification, and by utilizing the potential characteristic of the input end of the operational amplifier, the potential of the inverting input end of the operational amplifier AR3 offsets the potential of the non-inverting input end of the operational amplifier AR2, so that the temperature drift value is eliminated, and the accuracy of temperature detection is improved.
The output signal of the signal conditioning circuit is sent into a voltage stabilizing circuit for amplitude stabilization, the voltage stabilizing circuit comprises resistors R8 and R9, one ends of the resistors R8 and R9 are connected with the output end of an operational amplifier AR2, the other end of the resistor R8 is connected with the collector of a triode VT1, the other end of the resistor R9 is connected with the base of the triode VT1, one end of a capacitor C3 and the cathode of a zener diode DZ1, the other end of the capacitor C3 is grounded in parallel with the anode of the zener diode DZ1, and the emitter of the triode VT1 is connected with the input end of a microprocessor and is grounded through a resistor R10. The voltage stabilizing circuit utilizes the triode voltage stabilizing principle to stabilize the output signal of the operational amplifier AR2, and the stability of the temperature signal is greatly improved.
The utility model discloses when specifically using, the gaseous roots flowmeter of intelligence utilizes flow sensor to detect gas flow to adopt temperature sensor and pressure sensor to carry out signal compensation, all send into above-mentioned three kinds of signals at last and carry out the warm-pressing compensation according to the gaseous state equation in microprocessor, and carry out the correction of compression factor correction in order to realize the volume to gas. When temperature compensation is carried out, the temperature sensing probe BG1 in the temperature detection circuit detects the temperature of a gas channel of the flowmeter in real time, and in order to improve the stability of signal amplification, the output signal of the operational amplifier AR1 is improved by utilizing the good temperature characteristic of an MOS (metal oxide semiconductor) tube, so that the signal has a good output waveform, and the influence of the external environment temperature is effectively eliminated. Then, the signal conditioning circuit effectively prevents the temperature detection signal from drifting by using the operational amplifiers AR2 and AR3, and improves the accuracy of temperature detection. Finally, the voltage stabilizing circuit improves the stability of the temperature signal sent into the microprocessor by utilizing a triode voltage stabilizing principle, so that the interference of the temperature sensor by the temperature of a working end and the temperature of the external environment during temperature detection is eliminated, the temperature measurement is accurate and reliable, the compensation effect is good, and the accuracy of the intelligent gas waist wheel flowmeter is effectively ensured.
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. Gaseous roots flowmeter of intelligence, including the integrating instrument, set up microprocessor in the integrating instrument, its characterized in that: the temperature compensation module comprises a temperature detection circuit, a signal conditioning circuit and a voltage stabilizing circuit which are connected in sequence, the temperature detection circuit comprises a temperature sensing probe BG1, the base and the collector of the temperature sensing probe BG1 are connected with one ends of resistors R1, R2 and a capacitor C1, the other end of the resistor R1 is connected with a +5V power supply, the other end of the capacitor C1 is grounded with the emitter of the temperature sensing probe BG1, one end of the resistor R2 is connected with the non-inverting input end of an operational amplifier AR1, the output end of the operational amplifier AR1 is connected with the grid of an MOS tube Q1, the inverting output end of the operational amplifier AR1 is connected with the source of the MOS tube Q1 and one end of the resistor R4, the other end of the resistor R4 is grounded, and the drain of the MOS tube Q1 is connected with the + 5V.
2. The intelligent gas roots meter of claim 1, wherein: the signal conditioning circuit comprises operational amplifiers AR2 and AR3, wherein a non-inverting input end of the operational amplifier AR2 is connected with a source electrode of a MOS transistor Q1 through a resistor R5, an inverting input end of the operational amplifier AR2 is connected with an inverting input end and an output end of the operational amplifier AR3, an output end of the operational amplifier AR2 is connected with a non-inverting input end of the operational amplifier AR3 and one end of a resistor R7 through a resistor R6, the other end of the resistor R7 is grounded, and a capacitor C2 is connected between the non-inverting input end and the output end of the operational amplifier AR 2.
3. The intelligent gas roots meter of claim 2, wherein: the voltage stabilizing circuit comprises resistors R8 and R9, one ends of the resistors R8 and R9 are connected with the output end of an operational amplifier AR2, the other end of the resistor R8 is connected with the collector of a triode VT1, the other end of the resistor R9 is connected with the base of the triode VT1, one end of a capacitor C3 and the cathode of a zener diode DZ1, the other end of the capacitor C3 is grounded in parallel with the anode of the zener diode DZ1, and the emitter of the triode VT1 is connected with the input end of a microprocessor and grounded through the resistor R10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921335760.2U CN210638754U (en) | 2019-08-17 | 2019-08-17 | Intelligent gas waist wheel flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921335760.2U CN210638754U (en) | 2019-08-17 | 2019-08-17 | Intelligent gas waist wheel flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210638754U true CN210638754U (en) | 2020-05-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921335760.2U Active CN210638754U (en) | 2019-08-17 | 2019-08-17 | Intelligent gas waist wheel flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210638754U (en) |
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2019
- 2019-08-17 CN CN201921335760.2U patent/CN210638754U/en active Active
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