Flow monitoring and adjusting device

Abstract

The utility model discloses a flow monitoring and adjusting device, which relates to the field of monitoring, and is characterized in that a fluid driving module in the flow monitoring and adjusting device can suck fluid into a fluid pipeline based on a driving signal after receiving the driving signal transmitted by a control module; the flow data acquisition module can acquire the current pressure difference data of the fluid pipeline, the control module can acquire the current flow data based on the current pressure difference data and judge whether the current flow data meet the expected flow standard, and if not, the driving signal is adjusted according to the current flow data and the expected flow standard; and the current traffic data meets the expected traffic standard. According to the scheme, the suction process of the fluid is controlled in an automatic mode, the flow data of the fluid pipeline are monitored, once it is monitored that the flow data do not conform to the expected flow standard, the driving signal is changed till the flow data conform to the expected flow standard, a closed loop of flow monitoring and adjusting is formed in the whole process, and the flow monitoring and adjusting efficiency is improved. And the working efficiency and the test accuracy are greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of monitoring, and in particular to a flow monitoring and adjustment device. Background Technology

[0002] With the development of technology, measurement equipment is being applied to more and more fields. Many measurement devices, especially environmental measurement devices such as particle counters, airborne bacteria samplers, and air flow meters, involve the collection of fluids. The current requirements for fluid collection generally require the fluid flow rate to be controlled within the target range. Therefore, it is necessary to continuously monitor and adjust the fluid flow rate until it meets the expectations. However, the current fluid monitoring methods often involve manually calibrating to the expected flow rate and then using the parameters of that expected flow rate to run pumps or fans. However, as the pumps or fans are running, their aging, unstable operation, and the influence of the fluid itself may cause the flow rate data to fail to be maintained within the expected range. Utility Model Content

[0003] The purpose of this invention is to provide a flow monitoring and adjustment device. This solution controls the fluid suction process in a closed-loop manner and monitors the flow data of the fluid pipeline. Once the flow data is detected to be inconsistent with the expected flow standard, the drive signal is changed until the flow data of the fluid pipeline meets the expected flow standard. The whole process enables the fluid flow to be monitored and adjusted, which greatly improves the accuracy of the fluid flow in the fluid pipeline meeting the standard.

[0004] To solve the above-mentioned technical problems, this utility model provides a flow monitoring and adjustment device, comprising:

[0005] A fluid drive module, wherein the control end of the fluid drive module is connected to the output end of the control module, and the drive end is connected to the fluid pipeline, and is used to draw fluid into the fluid pipeline according to the drive signal transmitted by the control module after being turned on;

[0006] The flow data acquisition module has its acquisition end connected to the fluid pipeline and its output end connected to the input end of the control module, and is used to acquire the current differential pressure data of the fluid pipeline.

[0007] The control module is used to provide drive signals and switching signals to the fluid drive module to control the operation and start / stop of the fluid drive module, and to obtain current flow data based on the current differential pressure data, and when the current flow data does not meet the expected flow standard, to adjust the drive signal according to the current flow data and the expected flow standard until the current flow data meets the expected flow standard.

[0008] Optionally, the fluid drive module includes: a drive circuit, a switching circuit, a first interface, and a driver;

[0009] The driving circuit and the switching circuit are connected to the driver via the first interface;

[0010] The control terminal of the drive circuit is connected to the first output terminal of the control module, and the output terminal is connected to the control terminal of the driver via the PWM signal input terminal of the first interface, for controlling the driver to work according to the corresponding duty cycle based on the drive signal;

[0011] The control terminal of the switching circuit is connected to the second output terminal of the control module, the power supply input terminal is connected to the first power supply, and the power supply output terminal is connected to the power supply input terminal of the first interface, for controlling the driver to start and stop accordingly based on the switching signal;

[0012] The grounding terminal of the first interface is grounded, and the output terminal is connected to the driver.

[0013] The air inlet or outlet of the actuator is connected to the fluid pipeline for drawing fluid into the fluid pipeline after it is turned on.

[0014] Optionally, the flow data acquisition module includes: a first pressure tapping tube, a second pressure tapping tube, and a micro differential pressure sensor;

[0015] The sampling ends of the first pressure tapping tube and the second pressure tapping tube are respectively connected to the fluid pipeline;

[0016] The input terminal of the micro differential pressure sensor is connected to the output terminals of the first pressure tapping tube and the second pressure tapping tube, respectively, and the output terminal is connected to the input terminal of the control module. It is used to sample the current differential pressure data of the fluid pipeline at the connection position of the first pressure tapping tube and the second pressure tapping tube through the first pressure tapping tube and the second pressure tapping tube and send it to the control module.

[0017] Optionally, the traffic data acquisition module further includes:

[0018] A differential pressure signal processing circuit is provided, wherein the input terminal of the differential pressure signal processing circuit is connected to the output terminal of the micro differential pressure sensor, and the output terminal is connected to the input terminal of the control module. The circuit is used to perform corresponding current limiting and filtering on the current differential pressure data signal, and transmit the current differential pressure data after current limiting and filtering to the control module.

[0019] Optionally, the differential pressure signal processing circuit includes: a first resistor, a second resistor, and a first capacitor;

[0020] The first end of the first resistor is connected to the output end of the micro differential pressure sensor, and the second end is connected to the first end of the second resistor, the first end of the first capacitor, and the input end of the control module, respectively.

[0021] The second terminal of the second resistor and the second terminal of the first capacitor are both connected to ground.

[0022] Optionally, the driving circuit includes: a third resistor, a fourth resistor, a fifth resistor, and a first transistor;

[0023] The first end of the third resistor is connected to the first output terminal of the control module, and the second end is connected to the base of the first transistor.

[0024] The emitter of the first transistor is connected to the first terminal of the fourth resistor and ground, respectively, and the collector of the first transistor is connected to the PWM signal input terminal of the first interface.

[0025] The second end of the fourth resistor is connected to the second end of the third resistor and the base of the first transistor, respectively.

[0026] The first end of the fifth resistor is connected to the second power supply, and the second end is connected to the PWM signal input terminal of the first interface.

[0027] Optionally, the driving circuit further includes: a first Schottky diode and a second interface;

[0028] The anode of the first Schottky diode is connected to ground, and the cathode is connected to the power supply output terminal of the second interface and the power supply input terminal of the first interface.

[0029] The input terminal of the second interface is connected to a backup power supply, and the power output terminal is connected to the power input terminal of the first interface.

[0030] The grounding terminal of the second interface is grounded.

[0031] Optionally, the switching circuit includes: a sixth resistor, a seventh resistor, a second transistor, an eighth resistor, a ninth resistor, and a MOSFET;

[0032] The first end of the sixth resistor is connected to the second output end of the control module, and the second end is connected to the first end of the seventh resistor and the base of the second transistor, respectively.

[0033] The emitter of the second transistor is connected to the second terminal of the seventh resistor and ground, respectively, and the collector is connected to the first terminal of the ninth resistor;

[0034] The second terminal of the ninth resistor is connected to the gate of the MOS transistor;

[0035] The source of the MOS transistor is connected to the first power supply and the first end of the eighth resistor, the gate is connected to the second end of the eighth resistor, and the drain is connected to the power input terminal of the first interface.

[0036] Optionally, the switching circuit further includes: a second Schottky diode, a third Schottky diode, and a filter module;

[0037] The second Schottky diode and the third Schottky diode are connected in parallel. The common anode terminal of the parallel connection is connected to the drain of the MOS transistor, and the common cathode terminal of the parallel connection is connected to the first terminal of the filter module and the power supply input terminal of the first interface, respectively.

[0038] Therefore, the second terminal of the filter module is connected to ground.

[0039] Optionally, the filtering module includes: a second capacitor and a third capacitor;

[0040] The first terminal of the second capacitor and the first terminal of the third capacitor are both connected to the power input terminal of the first interface and the common cathode terminal of the second Schottky diode and the third Schottky diode connected in parallel. The second terminal of the second capacitor and the second terminal of the third capacitor are grounded.

[0041] The purpose of this invention is to provide a flow monitoring and adjustment device. The fluid drive module in this device, upon receiving a drive signal from the control module, draws fluid into the fluid pipeline based on the drive signal. The flow data acquisition module collects the current differential pressure data of the fluid pipeline. Finally, the control module obtains the current flow data based on the current differential pressure data and determines whether the current flow data meets the expected flow standard. If the current flow data does not meet the expected flow standard, the drive signal is adjusted according to the current flow data and the expected flow standard until the current flow data meets the expected flow standard. This solution controls the fluid suction process in a closed-loop manner. By monitoring the flow data of the fluid pipeline, once the flow data is detected to be inconsistent with the expected flow standard, the drive signal is changed until the flow data of the fluid pipeline meets the expected flow standard. The entire process enables closed-loop monitoring and adjustment of the fluid flow, greatly improving the accuracy of fluid flow rate compliance in the fluid pipeline. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0043] Figure 1 A schematic diagram of the structure of a flow monitoring and adjustment device provided by this utility model;

[0044] Figure 2 A schematic diagram of the structure of a micro differential pressure monitoring module provided by this utility model;

[0045] Figure 3 A schematic diagram of a fluid pipeline provided by this utility model;

[0046] Figure 4 This is a schematic diagram of a driving circuit and a switching circuit provided by the present invention. Detailed Implementation

[0047] The core of this utility model is to provide a flow monitoring and adjustment device. This solution controls the fluid suction process in a closed loop. By monitoring the flow data of the fluid pipeline, once the flow data is found to be inconsistent with the expected flow standard, the drive signal is changed until the flow data of the fluid pipeline meets the expected flow standard. The whole process enables closed-loop monitoring and adjustment of the fluid flow, which greatly improves the accuracy of the fluid flow in the fluid pipeline meeting the standard.

[0048] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0049] Please refer to Figure 1 , Figure 1 A schematic diagram of a flow monitoring and adjustment device provided by this utility model. The flow monitoring and adjustment device includes:

[0050] The fluid drive module 1 has its control end connected to the output end of the control module 3 and its drive end connected to the fluid pipeline 4. It is used to draw fluid into the fluid pipeline 4 according to the drive signal transmitted by the control module 3 after it is turned on.

[0051] The flow data acquisition module 2 has its acquisition end connected to the fluid pipeline 4 and its output end connected to the input end of the control module 3. It is used to acquire the current differential pressure data of the fluid pipeline 4.

[0052] The control module 3 is used to provide drive signals and switching signals to the fluid drive module to control the operation and start / stop of the fluid drive module 1, and to obtain the current flow rate data based on the current differential pressure data, and to adjust the drive signal according to the current flow rate data and the expected flow rate standard when the current flow rate data does not meet the expected flow rate standard, until the current flow rate data meets the expected flow rate standard.

[0053] In this invention, it is considered that in the prior art, the flow rate is usually manually calibrated to the expected flow rate and then the parameters for obtaining the expected flow rate are used to operate the pump or fan. However, as the pump or fan is running, factors such as aging, unstable operation, and the fluid itself may cause the flow rate data to be unable to be maintained within the expected range, resulting in inaccurate flow rate. Therefore, this solution includes a closed-loop flow monitoring and adjustment device capable of monitoring and adjusting flow rates. This device comprises a flow drive module, a flow data acquisition module 2, and a control module 3. When flow rate acquisition is required, the control module 3 controls the flow drive module 1 to open via a switch signal and sends a corresponding drive signal to the flow drive module 1 based on user needs. Upon receiving the open signal from the switch signal, the flow drive module 1 opens and, upon receiving the drive signal, draws fluid into the fluid pipeline 4. Simultaneously, the flow data acquisition module 2 collects the current differential pressure data of the fluid pipeline 4. Finally, the control module 3 obtains the current flow rate data based on the current differential pressure data and determines whether the current flow rate data meets the expected flow rate standard. If the current flow rate data does not meet the expected flow rate standard, the drive signal is adjusted accordingly. Similarly, the flow drive module 1 adjusts the amount of fluid drawn into the fluid pipeline 4 based on the adjusted drive signal until the current flow rate data meets the expected flow rate standard, thus completing the monitoring and control process. Because this solution controls the fluid suction process through fluid monitoring and closed-loop adjustment, by monitoring the flow data of fluid pipeline 4, once the flow data is found to be inconsistent with the expected flow standard, the drive signal is changed until the flow data of fluid pipeline 4 meets the expected flow standard. The whole process does not require manual intervention, thus greatly improving work efficiency and test accuracy.

[0054] It should be noted that when the current flow rate data does not meet the expected flow rate standard, the control module may also send a stop-operation switch signal to the fluid drive module. In practical applications, the control module 3 will also determine whether the current flow rate data of the fluid pipeline 4 exceeds the preset flow rate range. If the current flow rate data does not meet the expected flow rate standard but is within the preset flow rate range, the fluid flow rate will be adjusted through the aforementioned adjustment drive signal method until the current flow rate data meets the expected flow rate standard. If the current flow rate data exceeds the preset flow rate range, it proves that there is a problem with the fluid suction process. At this time, the control module 3 will control the fluid drive module 1 to send a stop-operation switch signal and may also issue a corresponding alarm to remind the maintenance personnel to repair the fault as soon as possible.

[0055] This embodiment provides a flow monitoring and adjustment device. After receiving a drive signal from the control module 3, the fluid drive module 1 in the device draws fluid into the fluid pipeline 4 based on the drive signal. The flow data acquisition module 2 collects the current differential pressure data of the fluid pipeline 4. Finally, the control module 3 obtains the current flow data based on the current differential pressure data and determines whether the current flow data meets the expected flow standard. If the current flow data does not meet the expected flow standard, the drive signal is adjusted according to the current flow data and the expected flow standard until the current flow data meets the expected flow standard. Regarding how the control module 3 calculates the flow data of the fluid in the pipeline based on the differential pressure data at the connection point of the fluid pipeline 4, it can be based on calibration of the fluid pipeline 4, or it can obtain an algorithm formula based on data fitting, or it can obtain the flow data based on an existing algorithm formula, etc. No specific limitations are made here. This solution controls the fluid suction process through closed-loop monitoring and adjustment. By monitoring the flow data of fluid pipeline 4, if the flow data does not meet the expected flow standard, the drive signal is changed until the flow data of fluid pipeline 4 meets the expected flow standard. The entire process enables the fluid flow to be monitored and adjusted, which greatly improves the accuracy of the fluid flow rate meeting the standard on fluid pipeline 4.

[0056] As an optional embodiment, the fluid drive module 1 includes: a drive circuit, a switch circuit, a first interface U1, and a driver;

[0057] The drive circuit and the switching circuit are connected to the driver via the first interface U1;

[0058] The control terminal of the drive circuit is connected to the first output terminal of the control module 3. The output terminal is connected to the control terminal of the driver via the PWM signal input terminal of the first interface U1, and is used to control the driver to work according to the corresponding duty cycle based on the drive signal.

[0059] The control terminal of the switching circuit is connected to the second output terminal of the control module 3, the power supply input terminal is connected to the first power supply, and the power supply output terminal is connected to the power supply input terminal of the first interface U1, which is used to control the driver to start and stop accordingly based on the switching signal;

[0060] The grounding terminal of the first interface U1 is grounded, and the output terminal is connected to the driver;

[0061] The air inlet or outlet of the actuator is connected to the fluid line 4 to draw fluid into the fluid line 4 after it is turned on.

[0062] In this invention, considering that the fluid drive module 1 needs to control the suction of fluid based on the drive signal transmitted by the control module 3, the fluid drive module 1 of this solution is equipped with a drive circuit, a switch circuit, a driver, and a first interface U1. The control module 3 controls the start and stop of the driver by sending a switch signal and controls the operation of the driver by sending a drive signal. Here, the driver serves as the drive end of the fluid drive module 1. When both the switch circuit and the drive circuit are on and the first power supply is normally powered on, the driver is powered on based on the switch signal. The driver receives the PWM signal of the drive signal sent by the control module through the drive circuit and the first interface U1 and works according to the duty cycle corresponding to the drive signal, thereby suctioning fluid into the fluid pipeline 4. That is, the control module 3 controls the start and stop of the driver by sending switch signals and drive signals to the switch circuit and the drive circuit, thereby controlling the suction amount of the driver, ensuring the integrity of the solution. It can be understood that the control module 3 includes a microcontroller. The output end of the control module connected to the fluid drive module 1 includes a first output end connected to the drive circuit and a second output end connected to the switch circuit.

[0063] It should be noted that in practical applications, the driver can be a fan or a pump or other driving device that can extract fluid. In this application, the first interface U1 is connected to the drive circuit, the switching circuit and the driver, and transmits the output signals of the drive circuit and the switching circuit to the driver. The first interface U1 has multiple pins, including the PWM (Pulse-Width Modulation) signal input pin connected to the output terminal of the drive circuit, the power supply input pin connected to the power supply output terminal of the switching circuit, and the grounding pin connected to ground.

[0064] As an optional embodiment, the flow data acquisition module 2 includes: a first pressure tapping tube 21, a second pressure tapping tube 22, and a micro differential pressure sensor 23;

[0065] The sampling end of the first pressure tapping tube 21 and the sampling end of the second pressure tapping tube 22 are respectively connected to the fluid pipeline 4;

[0066] The input terminal of the micro differential pressure sensor 23 is connected to the output terminal of the first pressure tapping tube 21 and the output terminal of the second pressure tapping tube 22, respectively. The output terminal is connected to the input terminal of the control module 3. It is used to sample the current differential pressure data of the fluid pipeline 4 at the connection position of the first pressure tapping tube 21 and the second pressure tapping tube 22 through the first pressure tapping tube 21 and the second pressure tapping tube 22 and send it to the control module 3.

[0067] In this invention, considering that the differential pressure monitoring module needs to sample the differential pressure information of the fluid pipeline 4, the differential pressure monitoring module is equipped with a first pressure tapping tube 21, a second pressure tapping tube 22, and a differential pressure sensor 23. The differential pressure sensor 23 samples the current differential pressure data of the fluid pipeline 4 through the first pressure tapping tube 21 and the second pressure tapping tube 22 and sends it to the control module 3, ensuring the integrity of the flow data acquisition process. Here, the sampling end of the first pressure tapping tube 21 and the sampling end of the second pressure tapping tube 22 are the acquisition ends of the flow data acquisition module.

[0068] It should also be noted that the flow data acquisition module 2 of this application obtains the current flow data by acquiring the differential pressure data in the fluid pipeline 4 and then having the control module 3 calculate the current flow data. That is, the flow data acquisition module 2 of this application includes a micro-differential pressure monitoring module, such as... Figure 2 As shown, fluid line 4 also has requirements. Here, fluid line 4 is a channel for fluid flow. There is a pressure difference at the connection points between fluid line 4 and the first pressure tap 21, the second pressure tap 22, and fluid line 4. It can be a commercially available fluid line 4 with a throttling orifice, such as a venturi tube, or it can have an annular protrusion 41 inside, such as... Figure 3 As shown, the annular protrusion contracts the inner diameter of the fluid pipeline 4 at the annular protrusion. Therefore, the diameter of the fluid pipeline 4 at the connection point between the first pressure tapping tube 21 and the fluid pipeline 4, the inner diameter at the annular protrusion, and the diameter at the connection point between the second pressure tapping tube 22 and the fluid pipeline 4 exhibits a large-small-large diameter pattern. A throttling orifice is formed at the annular protrusion. The first pressure tapping tube 21 and the second pressure tapping tube 22 are respectively positioned before and after the throttling orifice of the fluid pipeline 4 and connected to the wall of the fluid pipeline 4. This is used by the micro differential pressure sensor 23 to collect the pressure difference at the connection points between the first pressure tapping tube 21, the second pressure tapping tube 22, and the fluid pipeline 4. It can be understood that the diameters of the fluid pipeline 4 at the connection points between the first pressure tapping tube 21 and the fluid pipeline 4, and the diameters of the fluid pipeline 4 at the connection points between the second pressure tapping tube 22 and the fluid pipeline 4, are larger than the inner diameter at the annular protrusion but do not need to be equal. The inner diameters of the fluid pipeline 4 before and after the annular protrusion also do not need to be uniform. No specific limitation is made here.

[0069] As an optional embodiment, the traffic data acquisition module 2 further includes:

[0070] The differential pressure signal processing circuit has its input terminal connected to the output terminal of the micro differential pressure sensor 23 and its output terminal connected to the input terminal of the control module 3. It is used to perform corresponding current limiting and filtering on the current differential pressure data signal and transmit the current differential pressure data after current limiting and filtering to the control module 3.

[0071] In this invention, considering that the current differential pressure data signal is easily affected by external environmental factors during transmission and may not be accurately transmitted to the control module 3, a differential pressure signal processing circuit is added between the micro differential pressure sensor 23 and the control module 3. The differential pressure signal processing circuit performs corresponding current limiting and filtering on the current differential pressure data signal output by the micro differential pressure sensor 23, and transmits the current differential pressure data after current limiting and filtering to the control module 3. This filters out the interference of the differential pressure signal during transmission and improves the reliability and accuracy of the solution.

[0072] As an optional embodiment, the differential pressure signal processing circuit includes: a first resistor R1, a second resistor R2, and a first capacitor C1;

[0073] The first end of the first resistor R1 is connected to the output end of the micro differential pressure sensor 23, and the second end is connected to the first end of the second resistor R2, the first end of the first capacitor C1, and the input end of the control module 3, respectively.

[0074] The second terminal of the second resistor R2 and the second terminal of the first capacitor C1 are both connected to ground.

[0075] In this invention, because the differential pressure signal processing circuit needs to perform corresponding current limiting and filtering on the signal of the current differential pressure data output by the micro differential pressure sensor 23, the differential pressure signal processing circuit of this solution is equipped with a first resistor R1, a second resistor R2 and a first capacitor C1. The differential pressure signal is divided and current limited by the first resistor R1, and the differential pressure signal is filtered by the RC filter composed of the second resistor R2 and the first capacitor C1, thus ensuring the integrity of the current limiting and filtering process.

[0076] As an optional embodiment, the driving circuit includes: a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a first transistor Q1;

[0077] The first end of the third resistor R3 is connected to the first output terminal of the control module 3, and the second end is connected to the base of the first transistor Q1.

[0078] The emitter of the first transistor Q1 is connected to the first terminal of the fourth resistor R4 and ground, respectively, and the collector of the first transistor is connected to the PWM signal input terminal of the first interface.

[0079] The second terminal of the fourth resistor R4 is connected to the second terminal of the third resistor R3 and the base of the first transistor Q1, respectively.

[0080] The first end of the fifth resistor R5 is connected to the second power supply, and the second end is connected to the PWM signal input terminal of the first interface U1.

[0081] In this invention, the driving circuit includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a first transistor Q1. The third resistor R3 and the fourth resistor R4 limit current, while the fifth resistor R5 is a pull-up resistor that boosts the voltage output from the collector of the first transistor Q1. The first transistor Q1 is controlled to turn on or off based on the driving signal transmitted from the control module 3. It should be noted that the fifth resistor R5, connected to the second power supply, is a pull-up resistor. Combined with the MOS (Metal-Oxide-Semiconductor Field-Effect Transistor) transistor Q3, its function is to boost the voltage of the driving signal output from the control module 3 to the driving circuit to the required range for the PWM signal input of the first interface U1. When the switching circuit is on, the driving circuit is on, and the first and second power supplies are normally powered on, the first interface U1 normally outputs a switching signal to the driver to start operation. The driver operates according to the corresponding duty cycle. Conversely, if any of the above conditions are not met, the driver cannot operate normally, ensuring the integrity of the solution.

[0082] As an optional embodiment, the driving circuit further includes: a first Schottky diode D1 and a second interface U2;

[0083] The anode of the first Schottky diode D1 is connected to ground, and the cathode is connected to the power supply output terminal of the second interface U2 and the power supply input terminal of the first interface.

[0084] The input terminal of the second interface U2 is connected to the backup power supply, and the power supply output terminal is connected to the power supply input terminal of the first interface U1.

[0085] The grounding terminal of the second interface U2 is grounded.

[0086] In this invention, considering that if the switching circuit fails, even if the control module 3 outputs a drive signal to control the first transistor Q1 to conduct, the driver will not be able to work. Therefore, this solution adds a second interface U2 to the drive circuit. When the switching circuit fails, the input terminal of the second interface U2 can be connected to a backup power supply, so that the driver can still be powered normally and work according to the drive signal. In addition, this solution adds a first Schottky diode D1 to discharge excess energy and thus improve the reliability of the solution.

[0087] As an optional embodiment, the switching circuit includes: a sixth resistor R6, a seventh resistor R7, a second transistor Q2, an eighth resistor R8, a ninth resistor R9, and a MOSFET Q3;

[0088] The first end of the sixth resistor R6 is connected to the second output terminal of the control module 3, and the second end is connected to the first end of the seventh resistor R7 and the base of the second transistor Q2 respectively.

[0089] The emitter of the second transistor Q2 is connected to the second terminal of the seventh resistor R7 and ground, respectively, and the collector is connected to the first terminal of the ninth resistor R9.

[0090] The second terminal of the ninth resistor R9 is connected to the gate of the MOSFET Q3;

[0091] The source of MOSFET Q3 is connected to the first power supply and the first end of the eighth resistor R8, the gate is connected to the second end of the eighth resistor R8, and the drain is connected to the power input terminal of the first interface U1.

[0092] In this invention, considering that the function of the switching circuit is to turn on after receiving the turn-on signal transmitted by the control module 3 and power the driver through the first interface U1, the switching circuit of this solution includes a sixth resistor R6, a seventh resistor R7, a second transistor Q2, an eighth resistor R8, a ninth resistor R9, and a MOSFET Q3. The sixth resistor R6 is used for current limiting; the seventh resistor R7 acts as a pull-down resistor to help turn off the second transistor Q2 more quickly; and the eighth resistor R8 acts as a bias resistor or pull-up resistor. When Q2 is not conducting, it pulls the voltage at the second terminal of the ninth resistor R9 to the same level as the voltage at the first terminal of the eighth resistor R8, thus energizing the MOSFET Q3. GS =0, MOSFET Q3 is not conducting. When Q2 is conducting, resistors R8 and R9 form a voltage divider, causing the gate voltage of MOSFET Q3 to drop. V GS When the voltage is less than 0, MOSFET Q3 is turned on, and the second transistor Q2 is turned on or off based on the switching signal from control module 3. When the second diode is turned on, the first power supply is normally powered on, then MOSFET Q3 turns on and supplies power to the first interface U1 to ensure that the first interface U1 is powered on normally, thus ensuring the integrity of the solution. For example, when MOSFET Q3 is a PMOS, and control module 3 outputs a high-level switching signal to the switching circuit, the second transistor Q2 turns on, and at this time, the voltage of MOSFET Q3 is... GS When the voltage is less than 0, MOSFET Q3 is turned on. The voltage between the first power supply (the power input terminal of the switching circuit) and the power output terminal (the power input terminal of the first interface U1) is connected, and the fan or pump operates. Conversely, when the voltage is less than 0, the control module outputs a low level to the switching circuit, and the second transistor Q2 is not turned on. At this time, the voltage of MOSFET Q3 is... GS =0, MOSFET Q3 is not conducting, the voltage of the first power supply (power input terminal of the switching circuit) is not connected to the power output terminal (power input terminal of the first interface U1), and the driver does not work.

[0093] As an optional embodiment, the switching circuit further includes: a second Schottky diode D2, a third Schottky diode D3, and a filter module;

[0094] The second Schottky diode D2 and the third Schottky diode D3 are connected in parallel. The common anode terminal of the parallel connection is connected to the drain of the MOSFET Q3, and the common cathode terminal of the parallel connection is connected to the first terminal of the filter module and the power supply input terminal of the first interface U1, respectively.

[0095] Therefore, the second terminal of the filter module is connected to ground.

[0096] In this invention, considering that electrical energy is easily affected by external environmental factors during transmission and may not be accurately transmitted to the first interface U1, a filtering module is added to filter the electrical energy transmitted to the first interface U1, thereby improving the stability of electrical energy transmission. In addition, to prevent electrical energy from flowing back into the switching circuit, a second Schottky diode D2 and a third Schottky diode D3 are added to achieve unidirectional conduction of electrical energy and to provide polarity protection, thereby improving the reliability of the solution.

[0097] It should be noted that in practical applications, such as Figure 4 As shown, the filtering module may include capacitors and charging capacitors or other filtering devices, which are not specifically limited in this application.

[0098] As an optional embodiment, the filtering module includes: a second capacitor C2 and a third capacitor C3;

[0099] The first terminal of the second capacitor C2 and the first terminal of the third capacitor C3 are both connected to the power input terminal of the first interface U1 and the common cathode terminal of the second Schottky diode D2 and the third Schottky diode D3 connected in parallel. The second terminal of the second capacitor C2 and the second terminal of the third capacitor C3 are grounded.

[0100] In this utility model, considering that capacitors have advantages such as good storage performance, long lifespan, small capacitance error, small size, large capacitance, good high-frequency characteristics, good frequency stability, low loss, high precision, and resistance to high voltage and high current impact, this solution uses the second capacitor C2 and the third capacitor C3 as the filtering module of this application, which is convenient for practical use.

[0101] It should be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0102] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A flow monitoring and adjustment device, characterized in that, include: A fluid drive module, wherein the control end of the fluid drive module is connected to the output end of the control module, and the drive end is connected to the fluid pipeline, and is used to draw fluid into the fluid pipeline according to the drive signal transmitted by the control module after being turned on; A flow data acquisition module, wherein the acquisition end of the flow data acquisition module is connected to the fluid pipeline and the output end is connected to the input end of the control module, is used to acquire the current differential pressure data of the fluid pipeline; The control module is used to provide drive signals and switching signals to the fluid drive module to control the operation and start / stop of the fluid drive module, and to obtain current flow data based on the current differential pressure data, and when the current flow data does not meet the expected flow, to adjust the drive signal according to the current flow data and the expected flow until the current flow data meets the expected flow. The fluid drive module includes: a drive circuit, a switch circuit, a first interface, and a driver, wherein the driver is a fan or a pump; The driving circuit and the switching circuit are connected to the driver via the first interface; The control terminal of the drive circuit is connected to the first output terminal of the control module, and the output terminal is connected to the control terminal of the driver via the PWM signal input terminal of the first interface, for controlling the driver to work according to the corresponding duty cycle based on the drive signal; The control terminal of the switching circuit is connected to the second output terminal of the control module, the power supply input terminal is connected to the first power supply, and the power supply output terminal is connected to the power supply input terminal of the first interface, for controlling the driver to start and stop accordingly based on the switching signal; The grounding terminal of the first interface is grounded, and the output terminal is connected to the driver. The air inlet or outlet of the actuator is connected to the fluid pipeline for drawing fluid into the fluid pipeline after it is turned on. The flow data acquisition module includes: a first pressure tapping tube, a second pressure tapping tube, and a micro differential pressure sensor; The sampling ends of the first pressure tapping tube and the second pressure tapping tube are respectively connected to the fluid pipeline; The input terminal of the micro differential pressure sensor is connected to the output terminals of the first pressure tapping tube and the second pressure tapping tube, respectively, and the output terminal is connected to the input terminal of the control module. It is used to sample the current differential pressure data of the fluid pipeline at the connection position of the first pressure tapping tube and the second pressure tapping tube through the first pressure tapping tube and the second pressure tapping tube and send it to the control module.

2. The flow monitoring and adjustment device as described in claim 1, characterized in that, The traffic data acquisition module also includes: A differential pressure signal processing circuit is provided, wherein the input terminal of the differential pressure signal processing circuit is connected to the output terminal of the micro differential pressure sensor, and the output terminal is connected to the input terminal of the control module. The circuit is used to perform corresponding current limiting and filtering on the current differential pressure data signal, and transmit the current differential pressure data after current limiting and filtering to the control module.

3. The flow monitoring and adjustment device as described in claim 2, characterized in that, The differential pressure signal processing circuit includes: a first resistor, a second resistor, and a first capacitor; The first end of the first resistor is connected to the output end of the micro differential pressure sensor, and the second end is connected to the first end of the second resistor, the first end of the first capacitor, and the input end of the control module, respectively. The second terminal of the second resistor and the second terminal of the first capacitor are both connected to ground.

4. The flow monitoring and adjustment device as described in claim 1, characterized in that, The driving circuit includes: a third resistor, a fourth resistor, a fifth resistor, and a first transistor; The first end of the third resistor is connected to the first output terminal of the control module, and the second end is connected to the base of the first transistor. The emitter of the first transistor is connected to the first terminal of the fourth resistor and ground, respectively, and the collector of the first transistor is connected to the PWM signal input terminal of the first interface. The second end of the fourth resistor is connected to the second end of the third resistor and the base of the first transistor, respectively. The first end of the fifth resistor is connected to the second power supply, and the second end is connected to the PWM signal input terminal of the first interface.

5. The flow monitoring and adjustment device as described in claim 4, characterized in that, The driving circuit further includes: a first Schottky diode and a second interface; The anode of the first Schottky diode is connected to ground, and the cathode is connected to the power supply output terminal of the second interface and the power supply input terminal of the first interface. The input terminal of the second interface is connected to a backup power supply, and the power output terminal is connected to the power input terminal of the first interface. The grounding terminal of the second interface is grounded.

6. The flow monitoring and adjustment device as described in claim 1, characterized in that, The switching circuit includes: a sixth resistor, a seventh resistor, a second transistor, an eighth resistor, a ninth resistor, and a MOSFET; The first end of the sixth resistor is connected to the second output end of the control module, and the second end is connected to the first end of the seventh resistor and the base of the second transistor, respectively. The emitter of the second transistor is connected to the second terminal of the seventh resistor and ground, respectively, and the collector is connected to the first terminal of the ninth resistor; The second terminal of the ninth resistor is connected to the gate of the MOS transistor; The source of the MOS transistor is connected to the first power supply and the first end of the eighth resistor, the gate is connected to the second end of the eighth resistor, and the drain is connected to the power input terminal of the first interface.

7. The flow monitoring and adjustment device as described in claim 6, characterized in that, The switching circuit further includes: a second Schottky diode, a third Schottky diode, and a filter module; The second Schottky diode and the third Schottky diode are connected in parallel. The common anode terminal of the parallel connection is connected to the drain of the MOS transistor, and the common cathode terminal of the parallel connection is connected to the first terminal of the filter module and the power supply input terminal of the first interface, respectively. Therefore, the second terminal of the filter module is connected to ground.

8. The flow monitoring and adjustment device as described in claim 7, characterized in that, The filtering module includes: a second capacitor and a third capacitor; The first terminal of the second capacitor and the first terminal of the third capacitor are both connected to the power input terminal of the first interface and the common cathode terminal of the second Schottky diode and the third Schottky diode connected in parallel. The second terminal of the second capacitor and the second terminal of the third capacitor are grounded.

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