A duct wind speed measuring device

Abstract

The utility model discloses a pipeline wind speed measuring device, pipeline wind speed measuring device includes: wind speed measurement module, static electricity collection module, signal regulation module and signal processing module, wind speed measurement module includes device shell and the electret in device shell, device shell communicates with the pipeline of measurement, static electricity collection module includes a plurality of electrometer and a plurality of signal acquisition circuit corresponding to a plurality of electrometer, and electrometer sets up on the electret, the input of signal acquisition circuit is electrically connected with the output of electrometer, signal regulation module is electrically connected between the output of signal acquisition circuit and the input of signal processing module, signal regulation module includes range regulation circuit and zero point regulation circuit. The device has realized high accuracy's pipeline wind speed measurement, satisfies the collection and processing requirement of multirange, high accuracy, has the advantages such as high accuracy, good stability and stable operation.

Description

Technical Field

[0001] This utility model relates to the field of pipeline wind speed detection technology, and in particular to a pipeline wind speed measuring device. Background Technology

[0002] In industrial production, pipeline air velocity is a core parameter characterizing fluid transport, and its measurement accuracy directly affects system operating efficiency, energy consumption control, and safety performance. In tobacco production, precise measurement of pipeline air velocity is crucial. Excessive air velocity can easily lead to material deposition and blockage of the pipeline. Pipeline air velocity determines material mixing efficiency and pollutant purification effectiveness, directly impacting the quality of tobacco products.

[0003] Existing technologies for measuring pipe wind speed have many limitations: some measuring devices can only perform single-point wind speed measurements and are easily affected by installation location and operational interference, resulting in low accuracy and precision of wind speed measurements; some measuring devices are easily affected by environmental factors and cannot meet the requirements for pipe wind speed measurement under multi-range and high dust concentration conditions. Utility Model Content

[0004] This utility model provides a pipeline wind speed measuring device that meets the requirements for multi-range and multi-precision data acquisition and processing, and has advantages such as high accuracy, good stability and stable operation.

[0005] This utility model provides a pipeline wind speed measuring device, including: a wind speed measuring module, an electrostatic acquisition module, a signal conditioning module, and a signal processing module;

[0006] The wind speed measurement module includes a device housing and an electret located inside the device housing; the device housing is connected to the pipe to be measured.

[0007] The electrostatic acquisition module includes multiple electrometers and multiple signal acquisition circuits corresponding to each of the multiple electrometers; the electrometers are disposed on the electret; the input terminal of the signal acquisition circuit is electrically connected to the output terminal of the electrometer.

[0008] The signal conditioning module is electrically connected between the output terminal of the signal acquisition circuit and the input terminal of the signal processing module; the signal conditioning module includes a range adjustment circuit and a zero-point adjustment circuit.

[0009] Optionally, the signal processing module includes a signal amplification circuit, a signal conversion circuit, and a signal processor;

[0010] The first input terminal of the signal amplification circuit is electrically connected to the first output terminal of the signal acquisition circuit through the range adjustment circuit; the second input terminal of the signal amplification circuit is electrically connected to the second output terminal of the signal acquisition circuit through the zero-point adjustment circuit; and the output terminal of the signal amplification circuit is electrically connected to the input terminal of the signal conversion circuit.

[0011] The output terminal of the signal conversion circuit is electrically connected to the input terminal of the signal processor.

[0012] Optionally, the signal amplification circuit includes an operational amplifier;

[0013] The non-inverting input of the operational amplifier is electrically connected to the first output of the signal acquisition circuit through the range adjustment circuit, and the inverting input of the operational amplifier is electrically connected to the second output of the signal acquisition circuit through the zero-point adjustment circuit; the signal output of the operational amplifier is electrically connected to the input of the signal conversion circuit and the inverting input of the operational amplifier.

[0014] Optionally, the signal conversion circuit includes an analog-to-digital converter.

[0015] Optionally, the pipeline wind speed measuring device further includes: a power module;

[0016] The power module is electrically connected to the power signal terminal of the signal processing module.

[0017] Optionally, the range adjustment circuit includes a first variable resistor; the zero-point adjustment circuit includes a second variable resistor.

[0018] Optionally, the signal acquisition circuit includes a first diode and a second diode;

[0019] The anode of the first diode is electrically connected to the first terminal of the electrometer, and the cathode of the first diode is electrically connected to the second input terminal of the signal amplification circuit through the zero-point adjustment circuit.

[0020] The anode of the second diode is electrically connected to the first input terminal of the signal amplification circuit through the range adjustment circuit, and the cathode of the second diode is electrically connected to the second terminal of the electrometer.

[0021] Optionally, the pipeline wind speed measuring device further includes: a display module;

[0022] The display control terminal of the signal processing module is connected to the control terminal of the display module.

[0023] Optionally, the device housing includes a shielding housing and a metal housing covering the outside of the shielding housing; at least one end of the metal housing is provided with a flange; the pipe to be tested is connected to the device housing through the flange.

[0024] Optionally, the inner side of the device housing has the same shape as the inner side of the pipe to be tested; the electret surrounds and is attached to the inner side of the device housing;

[0025] Each of the electrometers is evenly distributed on the side of the electret closest to the outer casing of the device.

[0026] The technical solution of this utility model utilizes the induced voltage generated by the electret and employs multiple electrometers in conjunction with multiple signal acquisition circuits to acquire signals, thereby improving the accuracy of signal acquisition. The signal adjustment module is used to adjust the signal, meeting the requirements of multi-range and multi-precision signal acquisition and processing. The signal processing module processes the signal and outputs the pipeline wind speed value, realizing high-precision pipeline wind speed measurement. The pipeline wind speed measuring device has advantages such as high accuracy, good stability and stable operation. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of the wind speed measurement module in a pipeline wind speed measurement device provided in this embodiment of the utility model;

[0029] Figure 2 This is a schematic diagram of the structure of a pipeline wind speed measuring device provided in an embodiment of this utility model;

[0030] Figure 3 This is a schematic diagram of another pipeline wind speed measuring device provided in this embodiment of the utility model;

[0031] Figure 4 This is a schematic diagram of the structure of another pipeline wind speed measuring device provided in this utility model embodiment;

[0032] Figure 5 This is a schematic diagram of another pipeline wind speed measuring device provided in this embodiment of the utility model;

[0033] Figure 6 This is a schematic diagram of another pipeline wind speed measuring device provided in this embodiment of the utility model;

[0034] Figure 7 This is a schematic diagram of another pipeline wind speed measuring device provided in this embodiment of the utility model;

[0035] Figure 8 This is a schematic diagram of the outer casing of a pipeline wind speed measuring device provided in an embodiment of this utility model. Detailed Implementation

[0036] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0037] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0038] Figure 1 This is a schematic diagram of the structure of the wind speed measurement module in a pipeline wind speed measurement device provided in this embodiment of the utility model. Figure 2 This is a schematic diagram of the structure of a pipeline wind speed measuring device provided in an embodiment of this utility model, as shown below. Figure 1 and Figure 2As shown, the pipeline wind speed measuring device includes a wind speed measuring module 10, an electrostatic acquisition module 20, a signal conditioning module 30, and a signal processing module 40. The wind speed measuring module 10 includes a device housing 11 and an electret 12 located inside the device housing 11. The device housing 11 is connected to the pipeline to be measured. The electrostatic acquisition module 20 includes multiple electrometers 21 and multiple signal acquisition circuits 22 corresponding to the multiple electrometers 21. The electrometers 21 are mounted on the electret 12. The input terminal of the signal acquisition circuit 22 is electrically connected to the output terminal of the electrometer 21. The signal conditioning module 30 is electrically connected between the output terminal of the signal acquisition circuit 22 and the input terminal of the signal processing module 40. The signal conditioning module 30 includes a range adjustment circuit 31 and a zero-point adjustment circuit 32.

[0039] The device housing 11 is connected to the pipe under test. The housing 11 is made of metal with the same thickness as the pipe under test to ensure the airtightness and robustness of the connection between the pipe wind speed measuring device and the pipe under test. An electret 12 is located inside the housing 11, allowing the wind flowing through the pipe to reach the location of the electret 12. Because different wind speeds generate different electrostatic fields, the induced voltage generated by the electret 12 in the wind speed measuring module 10 can be used to measure the wind speed in the pipe under test. The electret 12 located inside the housing 11 can be a ring-shaped structure. The inner diameter of this ring can be the same as the inner diameter of the pipe under test, and its inner surface is smooth. For example, the inner diameter of the pipe under test can be 1000mm, and the corresponding inner diameter of the ring-shaped electret 12 can also be 1000mm, the outer diameter can be 1200mm, and the height can be 200mm. The electret 12 can be prepared by hot-melt molding a certain amount of polytetrafluoroethylene (PTFE) material into a ring-shaped component. To form the required charge distribution and connect the polarization voltage, metal electrodes are respectively placed on the inner and outer sides of the molding mold. The heat resistance temperature of the metal electrodes is higher than 350℃, and the two metal electrodes are insulated and isolated by ceramic material. During the hot-melt molding and subsequent slow cooling of the PTFE, the outer electrode of the mold is connected to the positive terminal of a DC high-voltage power supply (2-10 kV), and the inner electrode is connected to the negative terminal. Under the action of this high-voltage electric field, the PTFE material is polarized, ultimately forming an electret ring with a positive charge on the outer surface and a negative charge on the inner surface. The electrostatic field strength of the electret 12 is affected by environmental factors. When wind passes through the ring-shaped electret 12, it carries a certain number of charged ions. The higher the wind speed, the greater the influence of the charged ions on the electric field, thus causing changes in the electric field voltage. Under specific ambient temperature and humidity conditions, the induced voltage generated by the electret 12 exhibits a high degree of correlation with the duct wind speed, and the correlation range is wide, with relatively little influence from temperature and good stability. Therefore, utilizing this characteristic of the electret 12 for duct wind speed detection has significant advantages.

[0040] The actual voltage within the electret 12 can be measured by multiple electrometers 21 evenly distributed and closely attached to the outer surface of the electret 12. These electrometers 21 can be vibrating capacitance electrometers. Vibrating capacitance electrometers generate alternating capacitance values ​​through mechanical vibration and convert the electrostatic field signal into a voltage signal. Vibrating capacitance electrometers possess superior linearity in electric field detection, enabling high-precision measurement of weak DC voltages and overcoming drift phenomena caused by long-term measurements. The formula for calculating the actual voltage of the electret 12 is as follows:

[0041] V a =V k *V p *K d / d;

[0042] Among them, V a It is the actual voltage of the electret; V k It is the characteristic coefficient of electret materials, V of polytetrafluoroethylene. k ≈0.92; Vp is the polarization voltage; K d This is the air gap distance coefficient. Since the vibrating capacitance electrometer is in close contact with the electret 12, the air gap distance can be ignored. Therefore, the air gap distance coefficient K is... d This can be ignored; d is the material thickness. The formula for calculating the actual voltage of a PTFE electret in an interference-free environment is as follows:

[0043] V a =0.92*V p / d;

[0044] The number of electrometers 21 can be 2 to 4. Each electrometer 21 can be covered with a protective layer, such as a polyimide protective layer, for moisture and dust protection and insulation. Multiple electrometers 21 cover different areas of the electret 12, improving the acquisition accuracy and reliability. Multiple signal acquisition circuits 22, corresponding one-to-one with each electrometer 21, can independently receive the signal from each electrometer 21, avoiding crosstalk between multiple channels. The signal conditioning module 30 receives the raw electrical signal output from the signal acquisition circuit 22 and adjusts it to meet the input requirements of the signal processing module 40. The signal conditioning module 30 includes a range adjustment circuit 31 and a zero-point adjustment circuit 32. The range adjustment circuit 31 calibrates the signal sensitivity to wind speed changes, adapting it to different wind speed scenarios. The zero-point adjustment circuit 32 calibrates the signal offset at zero wind speed, eliminating errors caused by environmental interference. The signal processing module 40 receives the signal processed by the signal conditioning module 30, filters and amplifies the voltage data through calculations, converts it into wind speed data, and outputs the wind speed data, achieving accurate measurement of pipeline wind speed.

[0045] This embodiment utilizes the induced voltage generated by the electret and employs multiple electrometers in conjunction with multiple signal acquisition circuits to acquire signals, thereby improving the accuracy of signal acquisition. The signal conditioning module is used to adjust the signal, meeting the requirements for multi-range and multi-precision signal acquisition and processing. The signal processing module processes the signal and outputs the pipeline wind speed value, realizing high-precision pipeline wind speed measurement. The pipeline wind speed measuring device has advantages such as high accuracy, good stability, and stable operation.

[0046] Optional, Figure 3 This is a schematic diagram of another pipeline wind speed measuring device provided in this embodiment of the present invention, for reference. Figure 1 and Figure 3 The signal processing module 40 includes a signal amplification circuit 41, a signal conversion circuit 42, and a signal processor 43. The first input terminal of the signal amplification circuit 41 is electrically connected to the first output terminal of the signal acquisition circuit 22 through the range adjustment circuit 31, and the second input terminal of the signal amplification circuit 41 is electrically connected to the second output terminal of the signal acquisition circuit 22 through the zero-point adjustment circuit 32. The output terminal of the signal amplification circuit 41 is electrically connected to the input terminal of the signal conversion circuit 42, and the output terminal of the signal conversion circuit 42 is electrically connected to the input terminal of the signal processor 43.

[0047] The electrical signal, after being adjusted by the range adjustment circuit 31, is input to the first input terminal of the signal amplification circuit 41. The electrical signal, after being adjusted by the zero-point adjustment circuit 32, is input to the second input terminal of the signal amplification circuit 41. The signal amplification circuit 41 is used to differentially amplify the electrical signals input to its first and second input terminals to enhance the signal strength. The amplified analog electrical signal is then transmitted to the signal conversion circuit 42. The signal conversion circuit 42 can convert the analog electrical signal into a digital signal and transmit the digital signal to the signal processor 43. The signal processor 43 can perform calculations on the digital signal and finally calculate the pipe wind speed value.

[0048] Optional, Figure 4 This is a structural schematic diagram of another pipeline wind speed measuring device provided in this utility model embodiment, for reference. Figure 1 and Figure 4 The signal amplification circuit 41 includes an operational amplifier 411; the non-inverting input terminal of the operational amplifier 411 is electrically connected to the first output terminal of the signal acquisition circuit 22 through the range adjustment circuit 31, and the inverting input terminal of the operational amplifier 411 is electrically connected to the second output terminal of the signal acquisition circuit 22 through the zero-point adjustment circuit 32; the signal output terminal of the operational amplifier 411 is electrically connected to the input terminal of the signal conversion circuit 42 and the inverting input terminal of the operational amplifier 411.

[0049] In this circuit, the non-inverting input of operational amplifier 411 receives the range-adjusted electrical signal, and the inverting input receives the zero-point-adjusted electrical signal. Through differential input, the electrical signals at both inputs are filtered, denoised, and amplified, ensuring that the amplified signal accurately reflects the electric field changes related to wind speed. The output voltage range is compatible with the signal conversion circuit 42. The output of operational amplifier 411 is connected to the input of signal conversion circuit 42 and simultaneously forms negative feedback with its own inverting input to stabilize the amplification factor, reduce distortion, and ensure stable amplification performance.

[0050] Optional, continue to refer to Figure 1 and Figure 4 The signal conversion circuit 42 includes an analog-to-digital converter 422.

[0051] The signal conversion circuit 42 includes an analog-to-digital converter 422, which can convert the analog voltage signal amplified by the operational amplifier 411 into a digital signal.

[0052] Optional, continue to refer to Figure 1 and Figure 4 The pipeline wind speed measuring device also includes a power supply module 50; the power supply module 50 is electrically connected to the power signal terminal of the signal processing module 40.

[0053] When the signal processing module 40 includes a signal amplification circuit 41, a signal conversion circuit 42, and a signal processor 43, the power supply module 50 can be electrically connected to the power signal terminals of the signal amplification circuit 41, the signal conversion circuit 42, and the signal processor 43 respectively, so that the power supply module 50 can supply power to the entire pipeline wind speed measuring device.

[0054] It is understood that the power supply signal terminal of the operational amplifier 411 may include a first power supply terminal and a second power supply terminal, and the positive power supply terminal of the power supply module 50 may be electrically connected to the first power supply terminal of the operational amplifier 411; the negative power supply terminal of the power supply module 50 may be electrically connected to the second power supply terminal of the operational amplifier 411.

[0055] Optional, Figure 5 This is a schematic diagram of another pipeline wind speed measuring device provided in this embodiment of the present invention, for reference. Figure 1 and Figure 5 The range adjustment circuit 31 includes a first variable resistor 311; the zero-point adjustment circuit 32 includes a second variable resistor 321.

[0056] In this circuit, the first terminal of the first variable resistor 311 is electrically connected to the first output terminal of the signal acquisition circuit 22, and the second terminal of the first variable resistor 311 is electrically connected to the non-inverting input terminal of the operational amplifier 411. The first terminal of the second variable resistor 321 is electrically connected to the second output terminal of the signal acquisition circuit 22, the first terminal of the second variable resistor 321 is grounded, and the second terminal of the second variable resistor 321 is electrically connected to the inverting input terminal of the operational amplifier 411. By adjusting the resistance value of the first variable resistor 311, the voltage division ratio of the signal input to the non-inverting input terminal of the operational amplifier 411 or the feedback coefficient of the amplifier circuit can be changed, thereby adjusting the signal amplification factor: when the wind speed is high, increasing the resistance value can reduce the amplification factor to avoid signal saturation; when the wind speed is low, decreasing the resistance value can increase the amplification factor to enhance signal sensitivity, ultimately achieving signal adaptation for different wind speed ranges. The resistance value of the second variable resistor 321 can be in the range of 0~5kΩ. By adjusting the resistance value of the second variable resistor 321, the reference voltage of the inverting input terminal of the operational amplifier 411 can be changed to compensate for the signal offset when the circuit is at zero wind speed. By calibrating the output signal of the operational amplifier 411 to zero under the zero wind speed state, the accuracy of the measurement starting point is ensured and the system error is reduced.

[0057] Optional, Figure 6 This is a schematic diagram of another pipeline wind speed measuring device provided in this embodiment of the present invention, for reference. Figure 1 and Figure 6 The signal acquisition circuit 22 includes a first diode D1 and a second diode D2; the anode of the first diode D1 is electrically connected to the first terminal of the electrometer 21, and the cathode of the first diode D1 is electrically connected to the second input terminal of the signal amplification circuit 41 through the zero-point adjustment circuit 32; the anode of the second diode D2 is electrically connected to the first input terminal of the signal amplification circuit 41 through the range adjustment circuit 31, and the cathode of the second diode D2 is electrically connected to the second terminal of the electrometer 21.

[0058] The signal acquisition circuit 22 includes a first diode D1 and a second diode D2. The diodes have unidirectional conduction performance. The first diode D1 in the multiple signal acquisition circuits 22, which correspond one-to-one with the multiple electrometers 21, is connected in parallel, and the second diode D2 in the multiple signal acquisition circuits 22, which correspond one-to-one with the multiple electrometers 21, is connected in parallel.

[0059] Specifically, taking the example of setting four electrometers 21 on the electret 12 as an example, the following explanation will be provided. (Reference) Figure 6Each electrometer 21 has its first terminal connected to the anode of a first diode D1, and its second terminal connected to the cathode of a second diode D2. The cathodes of multiple first diodes D1 are connected in parallel and then electrically connected to the second input terminal of the signal amplification circuit 41 via a zero-point adjustment circuit 32. Similarly, the anodes of multiple second diodes D2 are connected in parallel and then electrically connected to the first input terminal of the signal amplification circuit 41 via a range adjustment circuit 31. The parallel connection of multiple first diodes D1 and multiple second diodes D2 balances the output voltages of the multiple electrometers 21, forming a comprehensive signal output to the signal amplification circuit 41, thus improving the signal-to-noise ratio and uniformity of the voltage signal.

[0060] Optional, Figure 7 This is a schematic diagram of another pipeline wind speed measuring device provided in this embodiment of the present invention, for reference. Figure 1 and Figure 7 The pipeline wind speed measuring device also includes a display module 60; the display control terminal of the signal processing module 40 is connected to the control terminal of the display module 60.

[0061] The display module 60 can be an LCD screen, which is embedded in the device housing 11. The signal processing module 40 transmits the calculated real-time duct wind speed value to the LCD screen for display, allowing users to obtain the duct wind speed measurement results in real time and intuitively. When the duct wind speed measuring device includes a power module 50, the power module 50 can also supply power to the display module 60.

[0062] Optional, Figure 8 This is a schematic diagram of the outer casing of a pipeline wind speed measuring device provided in an embodiment of this utility model. Figure 8 As shown, the device housing 11 includes a shielding housing 111 and a metal housing 112 covering the outside of the shielding housing 111; at least one end of the metal housing 112 is provided with a flange 113; the pipe to be tested is connected to the device housing 11 through the flange 113.

[0063] The electrostatic acquisition module 20, signal conditioning module 30, and signal processing module 40 can all be housed within the shielded housing 111. A metal housing 112 covers the outside of the shielded housing 111, and an insulating layer is provided between the shielded housing 111 and the metal housing 112 to shield against external electromagnetic and electric field interference. If the test results need to be transmitted to the control system, a metal-shielded cable must be used for the entire transmission process. The double-layer design of the housing 11 effectively suppresses the effects of dust, moisture, and electromagnetic interference, ensuring the long-term reliable operation of this pipeline wind speed measuring device in harsh industrial pipeline environments such as the tobacco industry. At least one end of the metal housing 112 is provided with a flange 113; the pipeline to be tested is connected to the housing 11 through the flange 113, which allows the housing 11 to be sealed and securely connected to the pipeline to be tested.

[0064] It should be noted that the installation location of the pipeline wind speed measuring device should be far away from strong electromagnetic interference sources such as large motors and frequency converter cabinets, so as to avoid stray electromagnetic fields generated by strong electromagnetic interference sources interfering with the electrometer 21's acquisition of the electric field signal of the electret 12, which would lead to wind speed measurement errors.

[0065] Optional, continue to refer to Figure 8 The inner side of the device housing 11 has the same shape as the inner side of the pipe to be measured; the electret 12 surrounds and is attached to the inner side of the device housing 11; each electrometer 21 is evenly distributed on the side of the electret 12 close to the device housing 11.

[0066] The inner side of the device housing 11 has the same shape as the inner side of the pipe to be tested, ensuring that the airflow of the pipe to be tested can smoothly enter the interior of the device housing 11. Each electrometer 21 is evenly distributed and closely attached to the outer surface of the electret 12, and coated with a polyimide protective layer for moisture-proof, dust-proof and insulation protection, thereby realizing accurate measurement of pipe wind speed.

[0067] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A pipe wind speed measuring device, characterized in that, include: Wind speed measurement module, electrostatic acquisition module, signal conditioning module, and signal processing module; The wind speed measurement module includes a device housing and an electret located inside the device housing; the device housing is connected to the pipe to be measured. The electrostatic acquisition module includes multiple electrometers and multiple signal acquisition circuits corresponding to each of the multiple electrometers; the electrometers are disposed on the electret; the input terminal of the signal acquisition circuit is electrically connected to the output terminal of the electrometer. The signal conditioning module is electrically connected between the output terminal of the signal acquisition circuit and the input terminal of the signal processing module; the signal conditioning module includes a range adjustment circuit and a zero-point adjustment circuit.

2. The pipeline wind speed measuring device according to claim 1, characterized in that, The signal processing module includes a signal amplification circuit, a signal conversion circuit, and a signal processor; The first input terminal of the signal amplification circuit is electrically connected to the first output terminal of the signal acquisition circuit through the range adjustment circuit; the second input terminal of the signal amplification circuit is electrically connected to the second output terminal of the signal acquisition circuit through the zero-point adjustment circuit; and the output terminal of the signal amplification circuit is electrically connected to the input terminal of the signal conversion circuit. The output terminal of the signal conversion circuit is electrically connected to the input terminal of the signal processor.

3. The pipeline wind speed measuring device according to claim 2, characterized in that, The signal amplification circuit includes an operational amplifier; The non-inverting input of the operational amplifier is electrically connected to the first output of the signal acquisition circuit through the range adjustment circuit, and the inverting input of the operational amplifier is electrically connected to the second output of the signal acquisition circuit through the zero-point adjustment circuit; the signal output of the operational amplifier is electrically connected to the input of the signal conversion circuit and the inverting input of the operational amplifier.

4. The pipeline wind speed measuring device according to claim 2, characterized in that, The signal conversion circuit includes an analog-to-digital converter.

5. The pipeline wind speed measuring device according to claim 1, characterized in that, Also includes: Power module; The power module is electrically connected to the power signal terminal of the signal processing module.

6. The pipeline wind speed measuring device according to claim 1, characterized in that, The range adjustment circuit includes a first variable resistor; the zero-point adjustment circuit includes a second variable resistor.

7. The pipeline wind speed measuring device according to claim 1, characterized in that, The signal acquisition circuit includes a first diode and a second diode; The anode of the first diode is electrically connected to the first terminal of the electrometer, and the cathode of the first diode is electrically connected to the second input terminal of the signal amplification circuit through the zero-point adjustment circuit. The anode of the second diode is electrically connected to the first input terminal of the signal amplification circuit through the range adjustment circuit, and the cathode of the second diode is electrically connected to the second terminal of the electrometer.

8. The pipeline wind speed measuring device according to claim 1, characterized in that, Also includes: Display module; The display control terminal of the signal processing module is connected to the control terminal of the display module.

9. The pipeline wind speed measuring device according to claim 1, characterized in that, The device housing includes a shielding housing and a metal housing covering the outside of the shielding housing; at least one end of the metal housing is provided with a flange; the pipe to be tested is connected to the device housing through the flange.

10. The pipeline wind speed measuring device according to claim 1, characterized in that, The inner side of the device housing has the same shape as the inner side of the pipe to be tested; the electret surrounds and is attached to the inner side of the device housing; Each of the electrometers is evenly distributed on the side of the electret closest to the outer casing of the device.

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