CN213274404U - Thermal gas mass flowmeter - Google Patents
Thermal gas mass flowmeter Download PDFInfo
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- CN213274404U CN213274404U CN202022324939.7U CN202022324939U CN213274404U CN 213274404 U CN213274404 U CN 213274404U CN 202022324939 U CN202022324939 U CN 202022324939U CN 213274404 U CN213274404 U CN 213274404U
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Abstract
The utility model discloses a thermal type gas mass flowmeter, including the temperature detecting element, microprocessor and display, the temperature detecting element includes the thermal resistance sensor, the detected signal of thermal resistance sensor is sent into signal stabilization circuit and is handled in the filtering regulating circuit is put to fortune, fortune ware AR1 carries out the cophase to the output signal of triode VT1 in the filtering regulating circuit is put to fortune, electric capacity C2 plays the effect of signal compensation in the amplification process, improve signal output waveform, then utilize pi type LC filter to carry out noise reduction processing to the output signal of fortune ware AR1, effectively avoid external high frequency clutter interference, greatly improved the temperature measurement precision, fortune ware AR2 utilizes the voltage follower principle to carry out closed loop following feedback to the output of pi type LC filter, effectively promote the amplification effect of fortune ware AR1, improve the signal processing efficiency, the output signal that the filtering regulating circuit was put to fortune to the AD converter at last converts the digital quantity into and sends into MSP430 type singlechip, the measurement result is accurate and effective.
Description
Technical Field
The utility model relates to a gaseous mass flow meter technical field especially relates to a gaseous mass flow meter of hot type.
Background
The thermal gas mass flowmeter is an instrument for measuring gas flow by using a thermal diffusion principle, namely, when fluid flows through a heating object, the heat loss of the heating object is in a certain proportional relation with the flow of the fluid. The sensor is composed of two reference level thermal Resistors (RTDs), one is a speed sensor RH, the other sensor RMG is used for sensing the temperature of a measured gas, when fluid flows, the temperature difference between the two is in a linear relation with the flow, and the relation is converted into linear output of a measured flow signal through a microelectronic control technology, however, the processing efficiency and the accuracy of the flow signal still need to be improved in the processing process.
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 aims to provide a thermal gas mass flow meter.
The technical scheme for solving the problem is as follows: thermal type gas mass flow meter, including temperature detecting element, microprocessor and display, temperature detecting element includes the thermal resistance sensor, the detected signal of thermal resistance sensor is sent into and is handled in signal stabilization circuit and the filtering regulating circuit is put to fortune, the input of signal stabilization circuit is connected the signal output part of thermal resistance sensor, the output of signal stabilization circuit is connected the filtering regulating circuit's is put to fortune input, the filtering regulating circuit's is put to fortune output passes through the AD converter and connects microprocessor's input, microprocessor passes through data bus connection the display.
Preferably, the signal stabilizing circuit comprises a resistor R1, one end of the resistor R1 is connected to the signal output end of the thermal resistance sensor and is grounded through a capacitor C1, the other end of the resistor R1 is connected to one end of a resistor R2 and the collector of a transistor VT1, the base of the transistor VT1 is connected to the other end of the resistor R2 and the cathode of a zener diode DZ1, the anode of the zener diode DZ1 is grounded, and the emitter of the transistor VT1 is grounded through a resistor R3.
Preferably, the operational amplifier filtering and adjusting circuit comprises an operational amplifier AR1, a non-inverting input terminal of the operational amplifier AR1 is connected to an emitter of a transistor VT1, an inverting input terminal of the operational amplifier AR1 is connected to an output terminal of the operational amplifier AR1 through a capacitor C2, an output terminal of the operational amplifier AR1 is grounded through a capacitor C3, one end of a capacitor C4 and the a/D converter are connected through an inductor L1, and the other end of the capacitor C4 is grounded.
Preferably, the operational amplifier filter regulating circuit further includes an operational amplifier AR2, a non-inverting input terminal of the operational amplifier AR2 is connected to one end of the capacitor C4, and an inverting input terminal and an output terminal of the operational amplifier AR2 are connected to an inverting input terminal of the operational amplifier AR1 through a resistor R4.
Preferably, the thermal resistance sensor is a TR/02024 type temperature sensor.
Preferably, the microprocessor is an MSP430 type single chip microcomputer.
Through the technical scheme, the beneficial effects of the utility model are that:
1. the detection signal of the thermal resistance sensor J1 is subjected to low-pass filtering by a capacitor C1 and then sent into a triode VT1 for amplification, and a voltage stabilizing diode DZ1 plays a reference role in the base voltage of the triode VT1, so that the stability of the amplification and output of the emitter signal of the triode VT1 is ensured;
2. an operational amplifier AR1 in the operational amplifier filtering and adjusting circuit amplifies the output signal of the triode VT1 in phase, a capacitor C2 plays a role in signal compensation in the amplification process, the signal output waveform is improved, then a pi-type LC filter is used for carrying out noise reduction on the output signal of the operational amplifier AR1, external high-frequency clutter interference is effectively avoided, and the temperature measurement precision is greatly improved;
3. the operation amplifier AR2 utilizes the voltage follower principle to carry out closed-loop following feedback on the output of the pi-type LC filter, effectively improves the amplification effect of the operation amplifier AR1, and improves the signal processing efficiency.
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.
Thermal type gas mass flowmeter, including temperature detecting element, microprocessor and display, temperature detecting element includes the thermal resistance sensor, the detected signal of thermal resistance sensor is sent into signal stabilization circuit and is handled in the filtering regulating circuit is enlargied to fortune, the signal output part of thermal resistance sensor is connected to the input of signal stabilization circuit, the input of filtering regulating circuit is enlargied to fortune is connected to the output of signal stabilization circuit, the output of filtering regulating circuit is enlargied to fortune passes through AD converter and connects microprocessor's input. During specific setting, the microprocessor is an MSP430 type single chip microcomputer, and the MSP430 type single chip microcomputer is connected with a display through a data bus.
The signal stabilizing circuit comprises a resistor R1, one end of a resistor R1 is connected with a signal output end of the thermal resistance sensor and is grounded through a capacitor C1, the other end of the resistor R1 is connected with one end of a resistor R2 and a collector of a triode VT1, a base of the triode VT1 is connected with the other end of the resistor R2 and a cathode of a zener diode DZ1, an anode of the zener diode DZ1 is grounded, and an emitter of the triode VT1 is grounded through a resistor R3.
The operational amplifier filtering and adjusting circuit comprises an operational amplifier AR1, wherein the non-inverting input end of the operational amplifier AR1 is connected with the emitter of a triode VT1, the inverting input end of the operational amplifier AR1 is connected with the output end of an operational amplifier AR1 through a capacitor C2, the output end of the operational amplifier AR1 is grounded through a capacitor C3, one end of a capacitor C4 and an A/D converter are connected through an inductor L1, and the other end of the capacitor C4 is grounded.
The operational amplifier filter regulating circuit further comprises an operational amplifier AR2, wherein a non-inverting input terminal of the operational amplifier AR2 is connected with one end of a capacitor C4, and an inverting input terminal and an output terminal of the operational amplifier AR2 are connected with an inverting input terminal of an operational amplifier AR1 through a resistor R4.
The utility model discloses when specifically using, thermal resistance sensor J1 chooses for use TR/02024 type temperature sensor, and its detected signal handles in sending into signal stabilization circuit at first, and its principle is: the detection signal of the TR/02024 type temperature sensor is subjected to low-pass filtering by a capacitor C1 and then is sent into a triode VT1 for amplification, and a voltage stabilizing diode DZ1 plays a reference role in the base voltage of the triode VT1, so that the stability of the amplification output of the emitter signal of the triode VT1 is ensured. The operational amplifier filtering and adjusting circuit further processes the output signal of the triode VT1, wherein the operational amplifier AR1 amplifies the output signal of the triode VT1 in phase, and the capacitor C2 plays a role in signal compensation in the amplification process, so that the signal output waveform is improved. Then, the inductor L1 and the capacitors C3 and C4 form a pi-type LC filter to perform noise reduction processing on an output signal of the operational amplifier AR1, so that external high-frequency clutter interference is effectively avoided, and the temperature measurement precision is greatly improved. Meanwhile, the operational amplifier AR2 utilizes the voltage follower principle to carry out closed-loop following feedback on the output of the pi-type LC filter, so that the amplification effect of the operational amplifier AR1 is effectively improved, and the signal processing efficiency is improved. And finally, the A/D converter converts the output signal of the operational amplifier filtering regulating circuit into digital quantity and sends the digital quantity into the MSP430 type single chip microcomputer. The MSP430 type single chip microcomputer sends flow measurement data to a display for displaying by utilizing the existing mature microelectronic control technology, and the measurement result is accurate and effective.
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 (6)
1. Thermal type gas mass flowmeter, including temperature detecting element, microprocessor and display, its characterized in that: the temperature detecting unit comprises a thermal resistance sensor, a detection signal of the thermal resistance sensor is sent into a signal stabilizing circuit and an operational amplifier filter regulating circuit to be processed, the input end of the signal stabilizing circuit is connected with the signal output end of the thermal resistance sensor, the output end of the signal stabilizing circuit is connected with the input end of the operational amplifier filter regulating circuit, the output end of the operational amplifier filter regulating circuit is connected with the input end of a microprocessor through an analog-to-digital (A/D) converter, and the microprocessor is connected with a display through a data bus.
2. The thermal gas mass flowmeter of claim 1, characterized in that: the signal stabilizing circuit comprises a resistor R1, one end of a resistor R1 is connected with a signal output end of the thermal resistance sensor and is grounded through a capacitor C1, the other end of the resistor R1 is connected with one end of a resistor R2 and a collector of a triode VT1, a base of the triode VT1 is connected with the other end of the resistor R2 and a cathode of a zener diode DZ1, an anode of the zener diode DZ1 is grounded, and an emitter of the triode VT1 is grounded through a resistor R3.
3. The thermal gas mass flowmeter of claim 2, characterized in that: the operational amplifier filtering and adjusting circuit comprises an operational amplifier AR1, wherein the non-inverting input end of the operational amplifier AR1 is connected with the emitter of a triode VT1, the inverting input end of the operational amplifier AR1 is connected with the output end of an operational amplifier AR1 through a capacitor C2, the output end of the operational amplifier AR1 is grounded through a capacitor C3, one end of a capacitor C4 and the A/D converter are connected through an inductor L1, and the other end of the capacitor C4 is grounded.
4. The thermal gas mass flowmeter of claim 2, characterized in that: the operational amplifier filtering and adjusting circuit further comprises an operational amplifier AR2, wherein a non-inverting input end of the operational amplifier AR2 is connected with one end of a capacitor C4, and an inverting input end and an output end of the operational amplifier AR2 are connected with an inverting input end of an operational amplifier AR1 through a resistor R4.
5. The thermal gas mass flow meter according to any of claims 1-4, characterized in that: the thermal resistance sensor is a TR/02024 type temperature sensor.
6. The thermal gas mass flowmeter of claim 5, characterized in that: the microprocessor is an MSP430 type single chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022324939.7U CN213274404U (en) | 2020-10-19 | 2020-10-19 | Thermal gas mass flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022324939.7U CN213274404U (en) | 2020-10-19 | 2020-10-19 | Thermal gas mass flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213274404U true CN213274404U (en) | 2021-05-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022324939.7U Active CN213274404U (en) | 2020-10-19 | 2020-10-19 | Thermal gas mass flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213274404U (en) |
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2020
- 2020-10-19 CN CN202022324939.7U patent/CN213274404U/en active Active
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