CN218097890U - High-precision Roots type natural gas flowmeter - Google Patents
High-precision Roots type natural gas flowmeter Download PDFInfo
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- CN218097890U CN218097890U CN202120447626.2U CN202120447626U CN218097890U CN 218097890 U CN218097890 U CN 218097890U CN 202120447626 U CN202120447626 U CN 202120447626U CN 218097890 U CN218097890 U CN 218097890U
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- pressure sensor
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Abstract
The utility model discloses a high accuracy natural gas roots flowmeter, including flow monitoring regulating element and microprocessor, flow monitoring regulating element includes pressure sensor, pressure sensor's detected signal is sent into after accurate steady amplitude amplification circuit and filter conversion circuit are handled in proper order among the microprocessor, the utility model discloses at first send pressure sensor's detected signal into accurate steady amplitude amplification circuit and handle, guarantee that signal amplification output has fine stability, effectively the resolution capability of lift system to the signal simultaneously. The filtering conversion circuit adopts an LC filter to further improve the accuracy of pressure detection signals, and the microprocessor adjusts and calibrates the gear according to the pressure difference of the inlet and the outlet of the fluid pipeline to keep the rotor at the correct relative position, so that the accuracy of the output flow of the natural gas is well ensured, and the adjustment and the measurement are accurate and reliable.
Description
Technical Field
The utility model relates to a flowmeter technical field especially relates to a gaseous roots flowmeter of high accuracy natural gas.
Background
Natural gas is one of safer fuel gases, does not contain carbon monoxide, is light in air, can be diffused upwards immediately once being leaked, is not easy to accumulate to form explosive gas, and has higher safety. MiningThe natural gas is used as energy, so that the consumption of coal and petroleum can be reduced, and the problem of environmental pollution is greatly improved. The Roots type natural gas flowmeter is a common natural gas metering tool, and mainly comprises a shell, a conjugate rotor, an intelligent flow integrating instrument and the like. A pair of conjugated rotors arranged in the measuring chamber, the rotors being arranged to vary the pressure difference (P) between the inlet and outlet of the gas flowing therethrough Into >P Go out ) Under the action of the adjusting gear, the rotor keeps the correct relative position through precision machining. However, natural gas is prone to generating instability of gas flow in the use process, so that deviation occurs in signal processing in the pressure detection process, and therefore the adjustment and metering are inaccurate.
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 aims to provide a roots flowmeter for high-precision natural gas.
The technical scheme for solving the problem is as follows: the high-precision natural gas Roots flowmeter comprises a flow monitoring and adjusting unit and a microprocessor, wherein the flow monitoring and adjusting unit comprises a pressure sensor, a detection signal of the pressure sensor is sent into the microprocessor after being processed by a precise amplitude-stabilizing amplifying circuit and a filtering and converting circuit in sequence, and the microprocessor is also connected with a wireless transmission module through a data bus.
Preferably, the accurate amplitude-stabilizing amplifying circuit comprises a resistor R1, one end of the resistor R1 is connected with one end of capacitors C1 and C2, one end of the resistor R2 and a signal output end of the pressure sensor, the other ends of the resistor R1 and the capacitor C1 are grounded, the other ends of the resistor R2 and the capacitor C2 are connected with an inverting input end of an operational amplifier AR1 and one end of a voltage regulator tube D1, the inverting input end of the operational amplifier AR1 is connected with one ends of resistors R3 and R5 and a pin 1 of a three-terminal regulator DZ1, the output end of the operational amplifier AR1 is connected with the other end of the voltage regulator tube D1, the other end of the resistor R5 is grounded, the other end of the resistor R3 is connected with a pin 3 of the three-terminal regulator DZ1 and an emitter of a triode VT1, a base of the triode VT1 is connected with a pin 2 of the three-terminal regulator DZ1 and one end of a resistor R4, and the other end of the resistor R4 is connected with a collector of the triode VT1 and connected with a +5V power supply.
Preferably, the filter conversion circuit includes a resistor R6, one end of the resistor R6 is connected to the output end of the operational amplifier AR1, the other end of the resistor R6 is connected to one end of the inductor L1 and is grounded through the rheostat RP1, and the other end of the inductor L1 is grounded through the capacitor C3 and is connected to the microprocessor through the a/D converter.
Preferably, the wireless transmission module is a GPRS wireless transmission module.
Through the technical scheme, the beneficial effects of the utility model are that: the utility model discloses send pressure sensor's detected signal into accurate steady amplitude amplification circuit at first and handle, guarantee that signal amplification output has fine stability, effective hoisting system is to the resolving power of signal simultaneously. The filtering conversion circuit adopts an LC filter to further improve the accuracy of a pressure detection signal, and the microprocessor adjusts and corrects the gear according to the pressure difference of the inlet and the outlet of the fluid pipeline to keep the rotor at the correct relative position, so that the accuracy of the output flow of the natural gas is well ensured, and the adjustment and the measurement are accurate and reliable.
Drawings
Fig. 1 is a schematic circuit diagram of the flow monitoring and adjusting unit of the present invention.
Detailed Description
The foregoing and other technical and other features and advantages of the invention will be apparent from the following more particular description of the embodiments of the invention, as illustrated in the accompanying drawings in which reference is made to 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 natural gas Roots flowmeter comprises a flow monitoring and adjusting unit and a microprocessor, wherein the flow monitoring and adjusting unit comprises a pressure sensor, a detection signal of the pressure sensor is sent into the microprocessor after being processed by a precise amplitude-stabilizing amplifying circuit and a filtering and converting circuit in sequence, and the microprocessor is also connected with a wireless transmission module through a data bus. When the flow detection device is used specifically, the GPRS wireless transmission module is selected as the wireless transmission module and used for transmitting flow detection data to the background management center in a remote mode.
The accurate amplitude stabilizing amplifying circuit comprises a resistor R1, one end of the resistor R1 is connected with one end of capacitors C1 and C2, one end of the resistor R2 and a signal output end of the pressure sensor, the other ends of the resistor R1 and the capacitor C1 are grounded, the other ends of the resistor R2 and the capacitor C2 are connected with an inverting input end of an operational amplifier AR1 and one end of a voltage stabilizing tube D1, the inverting input end of the operational amplifier AR1 is connected with one end of resistors R3 and R5 and a pin 1 of a three-terminal regulator DZ1, the output end of the operational amplifier AR1 is connected with the other end of the voltage stabilizing tube D1, the other end of the resistor R5 is grounded, the other end of the resistor R3 is connected with a pin 3 of the three-terminal regulator DZ1 and an emitting electrode of a triode VT1, a base electrode of the triode VT1 is connected with one end of a pin 2 of the three-terminal regulator DZ1 and one end of a resistor R4, and the other end of the resistor R4 is connected with a collector of the triode VT1 and connected with a +5V power supply.
The filtering conversion circuit comprises a resistor R6, one end of the resistor R6 is connected with the output end of the operational amplifier AR1, the other end of the resistor R6 is connected with one end of an inductor L1 and is grounded through a rheostat RP1, and the other end of the inductor L1 is grounded through a capacitor C3 and is connected with the microprocessor through an A/D converter.
The utility model discloses a concrete work flow and principle do: flow monitoring regulating unit sets up two pressure sensor respectively in fluid pipeline's play, entry, and every pressure sensor's theory of operation is the same, the utility model discloses use the pressure sensor P1 who sets up in the entrance as the example, pressure sensor P1 is used for detecting the pressure of pipeline entrance to at first send into the detected signal and handle in the accurate amplifier circuit that stabilizes. After the resistor R1 and the capacitor C1 form RC low-pass filtering and noise reduction, signal stabilization is performed in an RC channel formed by the resistor R2 and the capacitor C2, and then the signal is sent to the operational amplifier AR1 for amplification. The voltage-stabilizing tube D1 plays a role in stabilizing amplitude in the operational amplifier process, and ensures that signal amplification output has good stability. Meanwhile, in order to improve the recognition degree of the system to the pressure detection signal, the in-phase input end of the operational amplifier AR1 is also provided with a reference voltage circuit, and the reference voltage circuit consists of a +5V power supply, resistors R3-R5, a triode VT1 and a three-terminal regulator DZ1, so that an accurate reference voltage value is provided for the in-phase input end of the operational amplifier AR1, and the resolution of the system to the signal is effectively improved. The filtering conversion circuit adopts an LC filter formed by an inductor L1 and a capacitor C3 to accurately filter the output signal of the operational amplifier AR1, so that the accuracy of the pressure detection signal is further improved, and finally, the pressure detection signal is converted into digital quantity by the A/D converter and then is sent into the microprocessor. The microprocessor adjusts and corrects the gear according to the pressure difference of the inlet and the outlet of the fluid pipeline to ensure that the rotor keeps the correct relative position, thereby well ensuring the accuracy of the output flow of the natural gas and having good use value.
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 (4)
1. High accuracy natural gas roots flowmeter, including flow monitoring regulating unit and microprocessor, its characterized in that: the flow monitoring and adjusting unit comprises a pressure sensor, a detection signal of the pressure sensor is processed by a precise amplitude-stabilizing amplifying circuit and a filtering and converting circuit in sequence and then sent into the microprocessor, and the microprocessor is also connected with the wireless transmission module through a data bus.
2. The high-precision natural gas roots flowmeter of claim 1, wherein: the accurate amplitude-stabilizing amplifying circuit comprises a resistor R1, one end of the resistor R1 is connected with one end of capacitors C1 and C2, one end of the resistor R2 and a signal output end of the pressure sensor, the other ends of the resistor R1 and the capacitor C1 are grounded, the other ends of the resistor R2 and the capacitor C2 are connected with an inverting input end of an operational amplifier AR1 and one end of a voltage stabilizing tube D1, the inverting input end of the operational amplifier AR1 is connected with one ends of resistors R3 and R5 and a pin 1 of a three-terminal regulator DZ1, the output end of the operational amplifier AR1 is connected with the other end of the voltage stabilizing tube D1, the other end of the resistor R5 is grounded, the other end of the resistor R3 is connected with a pin 3 of the three-terminal regulator DZ1 and an emitting electrode of a triode VT1, a base electrode of the triode VT1 is connected with a pin 2 of the three-terminal regulator DZ1 and one end of a resistor R4, and the other end of the resistor R4 is connected with a collector of the triode VT1 and connected with a +5V power supply.
3. The high accuracy roots-type natural gas flowmeter of claim 2, wherein: the filter conversion circuit comprises a resistor R6, one end of the resistor R6 is connected with the output end of the operational amplifier AR1, the other end of the resistor R6 is connected with one end of the inductor L1 and is grounded through a rheostat RP1, and the other end of the inductor L1 is grounded through a capacitor C3 and is connected with the microprocessor through an A/D converter.
4. A high accuracy roots-type natural gas flowmeter as set forth in claims 1-3 wherein: and the wireless transmission module is a GPRS wireless transmission module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120447626.2U CN218097890U (en) | 2021-03-02 | 2021-03-02 | High-precision Roots type natural gas flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120447626.2U CN218097890U (en) | 2021-03-02 | 2021-03-02 | High-precision Roots type natural gas flowmeter |
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| Publication Number | Publication Date |
|---|---|
| CN218097890U true CN218097890U (en) | 2022-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120447626.2U Active CN218097890U (en) | 2021-03-02 | 2021-03-02 | High-precision Roots type natural gas flowmeter |
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| Country | Link |
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| CN (1) | CN218097890U (en) |
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2021
- 2021-03-02 CN CN202120447626.2U patent/CN218097890U/en active Active
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