Flow monitoring and adjusting device

Abstract

The invention discloses a flow monitoring and adjusting device, and relates to the field of monitoring, 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, and a flow data acquisition module can acquire current pressure difference data of the fluid pipeline; the control module can obtain current flow data based on the current pressure difference data and judge whether the current flow data meet the expected flow standard or not, and if not, the driving signal is adjusted according to the current flow data and the expected flow standard till the current flow data meet the expected flow 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] The present invention relates to the field of monitoring, and in particular to a flow monitoring and adjusting device. Background Art

[0002] With the development of science and technology, measuring equipment is applied to more and more fields. Many measuring equipment, especially environmental measuring equipment such as particle counters, planktonic bacteria samplers, air volume meters, etc., involve the collection of fluids. In addition, the existing fluid collection requirements generally require the fluid flow to be controlled within a target range. Therefore, it is necessary to continuously monitor and regulate the fluid flow until it meets expectations. However, the existing fluid monitoring method often manually calibrates to the expected flow and then uses the parameters to obtain the expected flow to operate the pump or fan. However, as the pump or fan runs, its aging, unstable operation, and the influence of the fluid itself may cause the flow data to be unable to be maintained within the expected range. Summary of the invention

[0003] The purpose of the present invention is to provide a flow monitoring and adjustment device. This scheme controls the fluid suction process in a closed-loop manner and monitors the flow data of the fluid pipeline. Once it is monitored that the flow data does not meet 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, greatly improving the accuracy of the fluid flow in the fluid pipeline meeting the standard.

[0004] In order to solve the above technical problems, the present invention provides a flow monitoring and adjustment device, comprising:

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

[0006] The flow data acquisition module, 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, and is used to collect the current pressure difference data of the fluid pipeline;

[0007] The control module is used to provide a driving signal and a switch signal to the fluid driving module to control the operation and start and stop of the fluid driving module, and to obtain current flow data based on the current pressure difference data, and when the current flow data does not meet the expected flow standard, adjust the driving 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 control module is specifically used to:

[0009] When the current flow data does not meet the expected flow standard and is within a preset flow range, adjusting the driving signal according to the current flow data and the expected flow standard until the current flow data meets the expected flow standard;

[0010] When the current flow data does not meet the expected flow standard and exceeds a preset flow range, the switch signal is adjusted to control the fluid driving module to close.

[0011] Optionally, the fluid driving module includes: a driving circuit, a switch circuit, a first interface, and a driver;

[0012] The driving circuit and the switching circuit are connected to the driver via the first interface;

[0013] The control end of the driving circuit is connected to the first output end of the control module, and the output end is connected to the control end of the driver via the PWM signal input end of the first interface, so as to control the driver to work according to the corresponding duty cycle based on the driving signal;

[0014] The control end of the switch circuit is connected to the second output end of the control module, the power supply input end is connected to the first power supply, and the power supply output end is connected to the power supply input end of the first interface, and is used to control the driver to start and stop accordingly based on the switch signal;

[0015] The grounding terminal of the first interface is grounded, and the output terminal is connected to the driver;

[0016] The air inlet or the air outlet of the driver is connected to the fluid pipeline for sucking fluid into the fluid pipeline after being turned on.

[0017] Optionally, the flow data acquisition module includes: a first pressure taking tube, a second pressure taking tube and a micro differential pressure sensor;

[0018] The sampling end of the first pressure-taking tube and the sampling end of the second pressure-taking tube are respectively connected to the fluid pipeline;

[0019] The input end of the micro-pressure differential sensor is respectively connected to the output end of the first pressure taking tube and the output end of the second pressure taking tube, and the output end is connected to the input end of the control module, so as to sample the current pressure differential data of the connection position between the fluid pipeline and the first pressure taking tube and the second pressure taking tube through the first pressure taking tube and the second pressure taking tube and send it to the control module.

[0020] Optionally, the flow data collection module further includes:

[0021] A pressure difference signal processing circuit, wherein the input end of the pressure difference signal processing circuit is connected to the output end of the micro pressure difference sensor, and the output end is connected to the input end of the control module, and is used to perform corresponding current limiting and filtering on the signal of the current pressure difference data, and transmit the current pressure difference data after current limiting and filtering to the control module.

[0022] Optionally, the pressure difference signal processing circuit includes: a first resistor, a second resistor and a first capacitor;

[0023] The first end of the first resistor is connected to the output end of the micro differential pressure sensor, and the second end is respectively connected to the first end of the second resistor, the first end of the first capacitor and the input end of the control module;

[0024] The second end of the second resistor and the second end of the first capacitor are both connected to the ground.

[0025] Optionally, the driving circuit includes: a third resistor, a fourth resistor, a fifth resistor, and a first transistor;

[0026] A first end of the third resistor is connected to the first output end of the control module, and a second end is connected to the base of the first transistor;

[0027] The emitter of the first transistor is connected to the first end of the fourth resistor and the ground respectively, and the collector of the first transistor is connected to the PWM signal input end of the first interface;

[0028] 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;

[0029] 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 end of the first interface.

[0030] Optionally, the driving circuit further includes: a first Schottky diode and a second interface;

[0031] The anode of the first Schottky diode is connected to the ground, and the cathode is connected to the power supply output end of the second interface and the power supply input end of the first interface;

[0032] The input end of the second interface is connected to a backup power supply, and the power supply output end is connected to the power supply input end of the first interface;

[0033] The grounding terminal of the second interface is grounded.

[0034] Optionally, the switch circuit includes: a sixth resistor, a seventh resistor, a second triode, an eighth resistor, a ninth resistor, and a MOS tube;

[0035] The first end of the sixth resistor is connected to the second output end of the control module, and the second end is respectively connected to the first end of the seventh resistor and the base of the second transistor;

[0036] The emitter of the second transistor is connected to the second end of the seventh resistor and the ground respectively, and the collector is connected to the first end of the ninth resistor;

[0037] The second end of the ninth resistor is connected to the gate of the MOS tube;

[0038] The source of the MOS tube is connected to the first power supply and the first end of the eighth resistor respectively, the gate is connected to the second end of the eighth resistor, and the drain is connected to the power supply input end of the first interface.

[0039] Optionally, the switch circuit further includes: a second Schottky diode, a third Schottky diode, and a filter module;

[0040] The second Schottky diode and the third Schottky diode are connected in parallel, the anode common end of the parallel connection is connected to the drain of the MOS tube, and the cathode common end of the parallel connection is respectively connected to the first end of the filter module and the power supply input end of the first interface;

[0041] Therefore, the second end of the filter module is connected to the ground.

[0042] The purpose of the present invention is to provide a flow monitoring and adjustment device. After receiving the drive signal transmitted by the control module, the fluid driving module in the flow monitoring and adjustment device will draw the fluid into the fluid pipeline based on the drive signal, and the flow data acquisition module can collect the current pressure difference data of the fluid pipeline. Finally, the control module will obtain the current flow data according to the current pressure difference data and determine 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 scheme controls the fluid suction process in a closed-loop manner, and monitors the flow data of the fluid pipeline. Once it is monitored that the flow data does not meet 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 in a closed loop, which greatly improves the accuracy of the fluid flow on the fluid pipeline meeting the standard. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0044] Figure 1 A schematic diagram of the structure of a flow monitoring and adjustment device provided by the present invention;

[0045] Figure 2 A structural schematic diagram of a micro-pressure difference monitoring module provided by the present invention;

[0046] Figure 3 A schematic diagram of the structure of a fluid pipeline provided by the present invention;

[0047] Figure 4 A schematic structural diagram of a driving circuit and a switching circuit provided by the present invention. DETAILED DESCRIPTION

[0048] The core of the present invention is to provide a flow monitoring and adjustment device. This scheme controls the fluid suction process in a closed-loop manner, and monitors the flow data of the fluid pipeline. Once it is monitored that the flow data does not meet 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 the fluid flow to be monitored and adjusted in a closed loop, greatly improving the accuracy of the fluid flow in the fluid pipeline meeting the standard.

[0049] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] Please refer to Figure 1 , Figure 1 The present invention provides a flow monitoring and adjustment device. The flow monitoring and adjustment device includes:

[0051] A fluid driving module 1, wherein the control end of the fluid driving module 1 is connected to the output end of the control module 3, and the driving end is connected to the fluid pipeline 4, and is used to suck the fluid into the fluid pipeline 4 according to the driving signal transmitted by the control module 3 after being turned on;

[0052] A flow data acquisition module 2, wherein the acquisition end of the flow data acquisition module 2 is connected to the fluid pipeline 4, and the output end is connected to the input end of the control module 3, and is used to acquire current differential pressure data of the fluid pipeline 4;

[0053] The control module 3 is used to provide a driving signal and a switch signal to the fluid driving module to control the operation and start and stop of the fluid driving module 1, and to obtain the current flow data based on the current pressure difference data, and when the current flow data does not meet the expected flow standard, adjust the driving signal according to the current flow data and the expected flow standard until the current flow data meets the expected flow standard.

[0054] In the present invention, it is taken into consideration 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 runs, its aging, unstable operation, and the influence of factors such as the fluid itself may cause the flow data to be unable to always be maintained within the expected range, resulting in inaccurate flow. Therefore, a closed-loop flow monitoring and adjustment device capable of realizing flow monitoring and adjustment is provided in the present solution. The flow monitoring and adjustment device is provided with a flow driving module, a flow data acquisition module 2, and a control module 3. When fluid acquisition is required, the control module 3 controls the fluid driving module 1 to open through a switch signal, and sends a corresponding drive signal to the fluid driving module 1 based on user needs. When the fluid driving module 1 receives the opening signal in the switch signal, it opens, and after receiving the drive signal, it draws fluid into the fluid pipeline 4 according to the drive signal. At the same time, the flow data acquisition module 2 can collect the current pressure difference data of the fluid pipeline 4. Finally, the control module 3 obtains the current flow data based on the current pressure difference data, and judges whether the current flow data meets the expected flow standard based on the current flow data and 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. Similarly, the fluid driving module 1 adjusts the suction amount of the fluid in the fluid pipeline 4 according to the adjusted drive signal until the current flow data meets the expected flow standard, thereby completing the monitoring and control process. Because this solution controls the fluid suction process by means of fluid monitoring and closed-loop adjustment, and monitors the flow data of the fluid pipeline 4, once it is detected that the flow data does not meet the expected flow standard, the drive signal is changed until the flow data of the fluid pipeline 4 meets the expected flow standard. The entire process does not require manual labor, so the work efficiency and test accuracy are greatly improved.

[0055] It should be noted that, in actual applications, when the current flow data does not meet the expected flow standard, the control module 3 may also send a switch signal to the fluid drive module 1 to stop working. In actual applications, the control module 3 will also determine whether the current flow data of the fluid pipeline 4 exceeds the preset flow range. If the current flow data does not meet the expected flow standard but is within the preset flow range, the fluid flow will be adjusted by adjusting the drive signal until the current flow data meets the expected flow standard. If the current flow data exceeds the preset flow range, it proves that there is a problem in the fluid suction process. At this time, the control module 3 will control the fluid drive module 1 to send a switch signal to stop working, and can also send a corresponding alarm to remind the maintenance personnel to repair the fault as soon as possible.

[0056] The present embodiment provides a flow monitoring and adjustment device. After receiving the drive signal transmitted by the control module 3, the fluid driving module 1 in the flow monitoring and adjustment device will draw the fluid into the fluid pipeline 4 based on the drive signal. The flow data acquisition module 2 can collect the current pressure difference data of the fluid pipeline 4. Finally, the control module 3 will obtain the current flow data based on the current pressure difference data and determine 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. As for how the control module converts the flow data of the fluid in the pipeline based on the pressure difference data at the connection position of the fluid pipeline 4, it can be obtained through calibration based on the fluid pipeline 4, or it can be obtained by obtaining an algorithm formula based on data fitting, or it can be obtained based on an existing algorithm formula, etc., and no specific limitation is made here. This solution controls the fluid suction process through closed-loop monitoring and adjustment. By monitoring the flow data of the fluid pipeline 4, once it is detected that the flow data does not meet the expected flow standard, the drive signal is changed until the flow data of the fluid pipeline 4 meets the expected flow standard. The entire process enables the fluid flow to be monitored and adjusted in a closed loop, greatly improving the accuracy of the fluid flow on the fluid pipeline 4 meeting the standard.

[0057] Based on the above embodiments:

[0058] The control module 3 is specifically used for:

[0059] When the current flow data does not meet the expected flow standard and is within the preset flow range, the driving signal is adjusted according to the current flow data and the expected flow standard until the current flow data meets the expected flow standard;

[0060] When the current flow data does not meet the expected flow standard and exceeds the preset flow range, the switch signal is adjusted to control the fluid drive module to shut down.

[0061] In the present invention, considering that the flow data of the fluid pipeline 4 has a restricted range, when the flow data exceeds the restricted range, the corresponding reason may be that there is a problem with the fluid pipeline 4 or a problem with the flow monitoring and adjustment device, so the control module 3 in this solution will also determine whether the current flow data of the fluid pipeline 4 exceeds the preset flow range. If the current flow data exceeds the preset flow range, it proves that there is a problem in the fluid suction process. At this time, the control module 3 will control the fluid drive module 1 to stop immediately and issue a corresponding alarm to remind the maintenance personnel to repair the fault as soon as possible.

[0062] As an optional embodiment, the fluid driving module 1 includes: a driving circuit, a switch circuit, a first interface U1, and a driver;

[0063] The driving circuit and the switching circuit are connected to the driver via the first interface U1;

[0064] The control end of the driving circuit is connected to the first output end of the control module 3, and the output end is connected to the control end of the driver via the PWM signal input end of the first interface U1, for controlling the driver to work according to the corresponding duty cycle based on the driving signal;

[0065] The control end of the switch circuit is connected to the second output end of the control module 3, the power supply input end is connected to the first power supply, and the power supply output end is connected to the power supply input end of the first interface U1, and is used to control the driver to start and stop accordingly based on the switch signal;

[0066] The ground terminal of the first interface U1 is grounded, and the output terminal is connected to the driver;

[0067] The air inlet or the air outlet of the driver is connected to the fluid pipeline 4 for sucking the fluid into the fluid pipeline 4 after being opened.

[0068] In the present invention, considering that the fluid driving module 1 needs to control the suction of fluid based on the driving signal transmitted by the control module 3, the fluid driving module 1 of this solution is provided with a driving circuit, a switching circuit, a driver, and a first interface U1, wherein the control module 3 controls the start and stop of the driver by sending a switching signal and controls the operation of the driver by sending a driving signal. Here, the driver serves as the driving end of the fluid driving module 1. When the switching circuit and the driving circuit are both turned on and the first power supply is powered on normally, the driver is powered on based on the switching signal, and the driver receives the PWM signal of the driving signal sent by the control module through the driving circuit and the first interface U1 and works according to the duty cycle corresponding to the driving signal, thereby sucking the fluid into the fluid pipeline 4, that is, the control module 3 controls the opening and closing of the driver by sending a switching signal and a driving signal to the switching circuit and the driving circuit, thereby controlling the suction amount of the driver, thereby ensuring the integrity of the solution. It can be understood that the control module 3 includes a single-chip microcomputer, and the output end of the control module connected to the fluid driving module 1 includes a first output end connected to the driving circuit and a second output end connected to the switching circuit.

[0069] It should be noted that, in actual applications, the driver can be a fan or a driving device such as a pump that can extract fluid; in the present application, the first interface U1 is connected to the driving circuit, the switching circuit, and the driver, and transmits the output signals of the driving circuit and the switching circuit to the driver. The first interface U1 has multiple pins, including a PWM (Pulse-Width Modulation) signal input pin connected to the output end of the driving circuit, a power supply input pin connected to the power supply output end of the switching circuit, and a grounding pin connected to the ground, which is defined in the present application.

[0070] As an optional embodiment, the flow data acquisition module 2 includes: a first pressure-taking tube 21, a second pressure-taking tube 22 and a micro-pressure difference sensor 23;

[0071] The sampling end of the first pressure-taking tube 21 and the sampling end of the second pressure-taking tube 22 are respectively connected to the fluid pipeline 4;

[0072] The input end of the micro-pressure differential sensor 23 is respectively connected to the output end of the first pressure taking tube 21 and the output end of the second pressure taking tube 22, and the output end is connected to the input end of the control module 3, and is used to sample the current pressure differential data of the connection position between the fluid pipeline 4 and the first pressure taking tube 21 and the second pressure taking tube 22 through the first pressure taking tube 21 and the second pressure taking tube 22 and send it to the control module 3.

[0073] In the present invention, considering that the micro-pressure differential monitoring module needs to sample the pressure differential information of the fluid pipeline 4, the micro-pressure differential monitoring module in this scheme is provided with a first pressure taking tube 21, a second pressure taking tube 22 and a micro-pressure differential sensor 23, wherein the micro-pressure differential sensor 23 samples the current pressure differential data of the fluid pipeline 4 through the first pressure taking tube 21 and the second pressure taking tube 22 and sends it to the control module 3, thereby ensuring the integrity of the flow data collection process, wherein the sampling end of the first pressure taking tube 21 and the sampling end of the second pressure taking tube 22 are the collection ends of the flow data collection module.

[0074] It should also be noted that the flow data acquisition module 2 of the present application is to collect the pressure difference data in the fluid pipeline 4 and then further calculate the current flow data by the control module 3, that is, the flow data acquisition module 2 of the present application includes a micro-pressure difference monitoring module, such as Figure 2 As shown, the fluid pipeline 4 also has requirements. Here, the fluid pipeline 4 is a channel for fluid circulation. The fluid pipeline 4 has a pressure difference at the connection position between the first pressure-taking pipe 21, the second pressure-taking pipe 22 and the fluid pipeline 4. It can be a fluid pipeline 4 with a throttle hole available on the market, such as a venturi tube, or a fluid pipeline 4 with an annular protrusion 41, such as Figure 3 As shown, the annular protrusion shrinks the inner diameter of the fluid pipeline 4 at the annular protrusion, so the diameter of the fluid pipeline 4 at the connection position between the first pressure-taking tube 21 and the fluid pipeline 4, the inner diameter of the tube at the annular protrusion, and the diameter of the fluid pipeline 4 at the connection position between the second pressure-taking tube 22 and the fluid pipeline 4 present a large diameter-small diameter-large diameter, and a throttling hole is formed at the annular protrusion. The first pressure-taking tube 21 and the second pressure-taking tube 22 are respectively arranged before and after the throttling hole of the fluid pipeline 4 and are connected to the wall of the fluid pipeline 4, so that the micro-pressure differential sensor 23 can collect the pressure difference at the connection position between the first pressure-taking tube 21 and the second pressure-taking tube 22 and the fluid pipeline 4. It can be understood that the diameter of the fluid pipeline 4 at the connection position between the first pressure-taking tube 21 and the fluid pipeline 4 and the diameter of the fluid pipeline 4 at the connection position between the second pressure-taking tube 22 and the fluid pipeline 4 are larger than the inner diameter of the tube at the annular protrusion but do not need to be equal, and the inner diameter of the fluid pipeline 4 before and after the annular protrusion does not need to be uniform, and no specific limitation is made here.

[0075] As an optional embodiment, the flow data collection module 2 further includes:

[0076] The pressure difference signal processing circuit has an input end connected to the output end of the micro pressure difference sensor 23, and an output end connected to the input end of the control module 3, and is used to perform corresponding current limiting and filtering on the signal of the current pressure difference data, and transmit the current pressure difference data after current limiting and filtering to the control module 3.

[0077] In the present invention, considering that the signal of the current pressure difference data is easily affected by factors such as the external environment during transmission and may not be accurately transmitted to the control module 3, this solution further adds a pressure difference signal processing circuit between the micro-pressure difference sensor 23 and the control module 3. The pressure difference signal processing circuit performs corresponding current limiting and filtering on the signal of the current pressure difference data output by the micro-pressure difference sensor 23, and transmits the current pressure difference data after current limiting and filtering to the control module 3, thereby filtering out the interference of the pressure difference signal during transmission and improving the reliability and accuracy of the solution.

[0078] As an optional embodiment, the voltage difference signal processing circuit includes: a first resistor R1, a second resistor R2 and a first capacitor C1;

[0079] The first end of the first resistor R1 is connected to the output end of the micro-pressure difference sensor 23, and the second end is respectively 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;

[0080] The second end of the second resistor R2 and the second end of the first capacitor C1 are both connected to the ground.

[0081] In the present invention, because the pressure difference signal processing circuit needs to perform corresponding current limiting and filtering on the signal of the current pressure difference data output by the micro-pressure difference sensor 23, the pressure difference signal processing circuit of this scheme is provided with a first resistor R1, a second resistor R2 and a first capacitor C1. The pressure difference signal is divided and current limited by the first resistor R1, and the pressure difference signal is filtered by the RC filter formed by the second resistor R2 and the first capacitor C1, thereby ensuring the integrity of the current limiting and filtering process.

[0082] 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;

[0083] A first end of the third resistor R3 is connected to the first output end of the control module 3, and a second end is connected to the base of the first transistor Q1;

[0084] The emitter of the first transistor Q1 is connected to the first end of the fourth resistor R4 and the ground respectively, and the collector of the first transistor is connected to the PWM signal input end of the first interface;

[0085] The second end of the fourth resistor R4 is connected to the second end of the third resistor R3 and the base of the first transistor Q1 respectively;

[0086] A first end of the fifth resistor R5 is connected to the second power supply, and a second end thereof is connected to the PWM signal input end of the first interface U1.

[0087] In the present invention, the driving circuit is provided with a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a first transistor Q1, wherein the third resistor R3 and the fourth resistor R4 function as current limiting, the fifth resistor R5 is a pull-up resistor, which can pull up the voltage outputted by the collector of the first transistor Q1, and the first transistor Q1 is turned on or off based on the control of the driving signal transmitted by the control module 3. It should be noted that the fifth resistor R5 connected to the second power supply is a pull-up resistor, which, after being combined with the MOS (Metal-Oxide-Semiconductor Field-Effect Transistor) tube Q3, functions to increase the voltage of the driving signal outputted by the control module 3 to the driving circuit to the required range to the PWM signal input end of the first interface U1. When the switch circuit is turned on, the driving circuit is turned on, and the first power supply and the second power supply are powered on normally, the first interface U1 normally outputs a switch signal for starting to work to the driver, and the driver works according to the corresponding duty cycle. On the contrary, once one of the above conditions is not met, the driver cannot work normally, thereby ensuring the integrity of the scheme.

[0088] As an optional embodiment, the driving circuit further includes: a first Schottky diode D1 and a second interface U2;

[0089] The anode of the first Schottky diode D1 is connected to the 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;

[0090] The input end of the second interface U2 is connected to the backup power supply, and the power supply output end is connected to the power supply input end of the first interface U1;

[0091] A ground terminal of the second interface U2 is grounded.

[0092] In the present invention, considering that once a switch circuit fails, even if the control module 3 outputs a drive signal to control the first transistor Q1 to turn on, the driver cannot work, so this solution adds a second interface U2 in the drive circuit. When the switch circuit fails, the input end 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 thereby improve the reliability of the solution.

[0093] As an optional embodiment, the switch circuit includes: a sixth resistor R6, a seventh resistor R7, a second transistor Q2, an eighth resistor R8, a ninth resistor R9, and a MOS transistor Q3;

[0094] The first end of the sixth resistor R6 is connected to the second output end 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;

[0095] The emitter of the second transistor Q2 is connected to the second end of the seventh resistor R7 and the ground respectively, and the collector is connected to the first end of the ninth resistor R9;

[0096] The second end of the ninth resistor R9 is connected to the gate of the MOS tube Q3;

[0097] The source of the MOS transistor Q3 is connected to the first power source and the first end of the eighth resistor R8 respectively, the gate is connected to the second end of the eighth resistor R8, and the drain is connected to the power supply input end of the first interface U1.

[0098] In the present invention, considering that the function of the switch circuit is to turn on the switch circuit after receiving the switch signal transmitted by the control module 3 and to enable the driver to be powered through the first interface U1, the switch circuit of the present solution is provided with a sixth resistor R6, a seventh resistor R7, a second triode Q2, an eighth resistor R8, a ninth resistor R9, and a MOS tube Q3, wherein the sixth resistor R6 is used for current limiting, the seventh resistor R7 is used as a pull-down resistor to help turn off the second triode Q2 faster, and the eighth resistor R8 is used as a bias resistor or a pull-up resistor. When Q2 is not conducting, the voltage at the second end of the ninth resistor R9 is pulled up to the same voltage as the first end of the eighth resistor R8, so that the V GS =0, MOS tube Q3 is not conducting. When Q2 is conducting, the eighth resistor R8 and the ninth resistor R9 form a voltage divider, and the gate voltage of MOS tube Q3 decreases. GS <0, the MOS tube Q3 is turned on, and the second transistor Q2 is turned on or off based on the switch signal of the control module 3. When the second diode is turned on and the first power supply is powered on normally, the MOS tube Q3 is turned on and supplies power to the first interface U1 to ensure that the first interface U1 is powered normally, thereby ensuring the integrity of the solution.

[0099] For example, when the MOS tube Q3 is a PMOS, the control module 3 outputs a high-level switch signal to the switch circuit, and the second transistor Q2 is turned on. At this time, the V GS <0, MOS tube Q3 is turned on. The voltage of the first power supply (the power supply input end of the switch circuit) is connected to the power supply output end (the power supply input end of the first interface U1), and the fan or pump works. Otherwise, the control module outputs a low level to the switch circuit, and the second transistor Q2 is not turned on. At this time, V GS =0, the MOS tube Q3 is not conducting, the voltage of the first power supply (the power supply input end of the switch circuit) is not conducting between the power supply output end (the power supply input end of the first interface U1), and the driver does not work.

[0100] As an optional embodiment, the switch circuit further includes: a second Schottky diode D2, a third Schottky diode D3, and a filter module;

[0101] The second Schottky diode D2 and the third Schottky diode D3 are connected in parallel, the anode common end of the parallel connection is connected to the drain of the MOS tube Q3, and the cathode common end of the parallel connection is respectively connected to the first end of the filter module and the power supply input end of the first interface U1;

[0102] Therefore, the second end of the filter module is connected to the ground.

[0103] In the present invention, considering that electric energy is easily affected by factors such as the external environment during transmission and may not be accurately transmitted to the first interface U1, a filtering module is added in the present solution to filter the electric energy transmitted to the first interface U1 to improve the stability of electric energy transmission; in addition, in order to prevent the electric energy from flowing back into the switching circuit, a second Schottky diode D2 and a third Schottky diode D3 are added in the present solution to achieve unidirectional conduction of electric energy and play a role in polarity protection, thereby improving the reliability of the solution.

[0104] It should be noted that in practical applications, Figure 4 As shown, the filter module may include capacitors and charging capacitors or other filter components, which are not particularly limited in this application.

[0105] As an optional embodiment, the filtering module includes: a second capacitor C2 and a third capacitor C3;

[0106] The first end of the second capacitor C2 and the first end of the third capacitor C3 are connected to the power supply input end of the first interface U1 and the cathode common end of the second Schottky diode D2 and the third Schottky diode D3 in parallel, and the second end of the second capacitor C2 and the second end of the third capacitor C3 are grounded.

[0107] In the present invention, considering that the capacitor has the advantages of good storage, long life, small capacity error, small volume, large capacity, good high-frequency characteristics, good frequency stability, small loss, high precision, and ability to resist high voltage and high current impact, this scheme adopts the second capacitor C2 and the third capacitor C3 as the filtering module of this application, which is convenient for practical use.

[0108] It should be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0109] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be 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 will not be limited to the embodiments shown herein, but rather to 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 driving module, wherein the control end of the fluid driving module is connected to the output end of the control module, and the driving end is connected to the fluid pipeline, and is used to suck the fluid into the fluid pipeline according to the driving signal transmitted by the control module after being turned on; The flow data acquisition module, 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, and is used to collect the current pressure difference data of the fluid pipeline; The control module is used to provide a driving signal and a switch signal to the fluid driving module to control the operation and start and stop of the fluid driving module, and to obtain current flow data based on the current pressure difference data, and when the current flow data does not meet the expected flow standard, adjust the driving signal according to the current flow data and the expected flow standard until the current flow data meets the expected flow standard.

2. The flow monitoring and adjustment device according to claim 1, characterized in that: The control module is specifically used for: When the current flow data does not meet the expected flow standard and is within a preset flow range, adjusting the driving signal according to the current flow data and the expected flow standard until the current flow data meets the expected flow standard; When the current flow data does not meet the expected flow standard and exceeds a preset flow range, the switch signal is adjusted to control the fluid driving module to close.

3. The flow monitoring and adjustment device according to claim 1 or 2, characterized in that: The fluid driving module comprises: a driving circuit, a switch circuit, a first interface, and a driver; The driving circuit and the switching circuit are connected to the driver via the first interface; The control end of the driving circuit is connected to the first output end of the control module, and the output end is connected to the control end of the driver via the PWM signal input end of the first interface, so as to control the driver to work according to the corresponding duty cycle based on the driving signal; The control end of the switch circuit is connected to the second output end of the control module, the power supply input end is connected to the first power supply, and the power supply output end is connected to the power supply input end of the first interface, and is used to control the driver to start and stop accordingly based on the switch signal; The grounding terminal of the first interface is grounded, and the output terminal is connected to the driver; The air inlet or the air outlet of the driver is connected to the fluid pipeline for sucking fluid into the fluid pipeline after being turned on.

4. The flow monitoring and adjustment device according to claim 1, characterized in that: The flow data acquisition module includes: a first pressure taking tube, a second pressure taking tube and a micro differential pressure sensor; The sampling end of the first pressure-taking tube and the sampling end of the second pressure-taking tube are respectively connected to the fluid pipeline; The input end of the micro-pressure differential sensor is respectively connected to the output end of the first pressure taking tube and the output end of the second pressure taking tube, and the output end is connected to the input end of the control module, so as to sample the current pressure differential data of the connection position between the fluid pipeline and the first pressure taking tube and the second pressure taking tube through the first pressure taking tube and the second pressure taking tube and send it to the control module.

5. The flow monitoring and adjusting device according to claim 4, characterized in that: The flow data collection module also includes: A pressure difference signal processing circuit, wherein the input end of the pressure difference signal processing circuit is connected to the output end of the micro pressure difference sensor, and the output end is connected to the input end of the control module, and is used to perform corresponding current limiting and filtering on the signal of the current pressure difference data, and transmit the current pressure difference data after current limiting and filtering to the control module.

6. The flow monitoring and adjusting device according to claim 5, characterized in that: The pressure difference signal processing circuit comprises: 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 respectively connected to the first end of the second resistor, the first end of the first capacitor and the input end of the control module; The second end of the second resistor and the second end of the first capacitor are both connected to the ground.

7. The flow monitoring and adjusting device according to claim 3, characterized in that: The driving circuit comprises: a third resistor, a fourth resistor, a fifth resistor, and a first transistor; A first end of the third resistor is connected to the first output end of the control module, and a second end is connected to the base of the first transistor; The emitter of the first transistor is connected to the first end of the fourth resistor and the ground respectively, and the collector of the first transistor is connected to the PWM signal input end 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 end of the first interface.

8. The flow monitoring and adjusting device according to claim 7, 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 the ground, and the cathode is connected to the power supply output end of the second interface and the power supply input end of the first interface; The input end of the second interface is connected to a backup power supply, and the power supply output end is connected to the power supply input end of the first interface; The grounding terminal of the second interface is grounded.

9. The flow monitoring and adjusting device according to claim 3, characterized in that: The switch circuit includes: a sixth resistor, a seventh resistor, a second triode, an eighth resistor, a ninth resistor, and a MOS tube; The first end of the sixth resistor is connected to the second output end of the control module, and the second end is respectively connected to the first end of the seventh resistor and the base of the second transistor; The emitter of the second transistor is connected to the second end of the seventh resistor and the ground respectively, and the collector is connected to the first end of the ninth resistor; The second end of the ninth resistor is connected to the gate of the MOS tube; The source of the MOS tube is connected to the first power supply and the first end of the eighth resistor respectively, the gate is connected to the second end of the eighth resistor, and the drain is connected to the power supply input end of the first interface.

10. The flow monitoring and adjusting device according to claim 9, characterized in that: The switch 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 anode common end of the parallel connection is connected to the drain of the MOS tube, and the cathode common end of the parallel connection is respectively connected to the first end of the filter module and the power supply input end of the first interface; Therefore, the second end of the filter module is connected to the ground.

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