Airflow detection device and test method for airflow sensor testing

Abstract

The present application discloses an airflow detection device and a testing method for airflow sensor testing, the airflow detection device includes a digital barometer, an air suction pump, a main airflow channel and a parallel adjustment component; the air suction pump is used to generate an inhaled airflow for the main airflow channel; the parallel adjustment component and the digital barometer are sequentially arranged on the main airflow channel; the main airflow channel is used to connect the airflow sensor; the parallel adjustment component includes at least two throttle valves, and all the throttle valves in the parallel adjustment component are connected in parallel; the digital barometer is used to measure the air pressure value of the inhaled airflow in the main airflow channel; wherein, after the parallel adjustment component adjusts the inhaled airflow in the main airflow channel to trigger the airflow sensor to start working, if the air pressure value measured by the digital barometer is within a preset airflow sensitivity range, it is determined that the sensitivity of the airflow sensor is qualified.

Description

Technical Field

[0001] The present application relates to the technical field of airflow detection equipment, and in particular to an airflow detection device and a testing method for airflow sensor testing. Background Art

[0002] Electronic cigarettes can replace cigarettes. Due to the unique usability of electronic cigarettes, as long as the airway is open and air enters, the microphone will generally be started or shut down by opening or closing the airway, so that the battery starts working. The user only needs to inhale at the mouthpiece to smoke.

[0003] Most of the e-cigarettes on the current market use air intake holes with fixed air intake volume and cannot adjust the air intake volume. Alternatively, the e-cigarettes have poor sensitivity to user inhalation, which can easily affect the user's normal smoking experience.

[0004] In addition, conventional methods for detecting the sensitivity of electronic cigarette airflow sensors involve sampling the voltage of the microphone (airflow sensor) through a sampling circuit, amplifying the voltage through an amplifier circuit, and finally processing the signal through an analog-to-digital conversion microcontroller. Alternatively, the signal is processed directly by a high-bit analog-to-digital conversion microcontroller without amplification through the amplifier circuit. However, these current detection schemes require large microcontroller peripheral circuits, numerous components, and high reliability requirements for layout connections, which can easily lead to cumbersome board layouts. Furthermore, the system does not actively provide an air source to simulate inhalation. Summary of the Invention

[0005] This application discloses an airflow detection device and a test method for airflow sensor testing. The specific technical solutions are as follows:

[0006] An airflow detection device for testing an airflow sensor, the airflow detection device comprising a digital barometer, an air extraction pump, a main airflow channel, and a parallel adjustment component; the air extraction pump is configured to generate an inhaled airflow for the main airflow channel; the parallel adjustment component and the digital barometer are sequentially arranged on the main airflow channel; the main airflow channel is configured to connect to the airflow sensor; the parallel adjustment component comprises at least two throttle valves, all of which are arranged in parallel on the main airflow channel to support adjusting the inhaled airflow in the main airflow channel to trigger the airflow sensor to start operation; the digital barometer is configured to measure the air pressure of the inhaled airflow in the main airflow channel; wherein, after the parallel adjustment component adjusts the inhaled airflow in the main airflow channel to trigger the airflow sensor to start operation, if the air pressure value measured by the digital barometer is within a preset airflow sensitivity range, the sensitivity of the airflow sensor is determined to be qualified; wherein, when the type of the airflow sensor changes, the preset airflow sensitivity range required to be used changes; and wherein the maximum display range of the digital barometer maintains coverage of the preset airflow sensitivity range.

[0007] Furthermore, the airflow detection device also includes a one-way valve, which is arranged between the air pump and the parallel adjustment component; the air inlet end of the air pump is connected to the main airflow channel through the one-way valve to prevent the gas from flowing out of the air pump in one direction.

[0008] Furthermore, the airflow sensor is a microphone; the microphone includes a variable capacitor; after the microphone is started, if the air pressure value of the inhaled airflow in the main airflow channel increases, the capacitance value of the variable capacitor increases, but does not exceed the maximum capacitance value allowed by the microphone; after the microphone is started, if the air pressure value of the inhaled airflow in the main airflow channel decreases, the capacitance value of the variable capacitor decreases; wherein, the air pressure value of the main airflow channel when the microphone is started, or the air pressure value of the microphone when it is started is the minimum negative air pressure value of the main airflow channel when the microphone is in an operating state, and the minimum negative air pressure value is used to indicate the sensitivity of the airflow sensor.

[0009] Furthermore, under the regulating effect of the throttle valve on the suction airflow generated by the air pump, the capacitance value of the variable capacitor increases until the microphone changes from a static state to a discharged state; when the microphone changes to the discharged state, the microphone starts to work; after the microphone starts to work, the air pressure value measured by the digital barometer is greater than a preset air pressure start threshold, wherein the preset air pressure start threshold is an upper limit value of a preset air flow sensitivity range.

[0010] Furthermore, the airflow detection device also includes two first air pipe joints; the one-way valve and the parallel adjustment component are connected to one end of the main airflow channel through one of the first air pipe joints, and the digital pressure gauge and the microphone are connected to the other end of the main airflow channel through the other first air pipe joint, so that the parallel adjustment component, the airflow sensor and the main airflow channel are connected, and the air pressure value in the main airflow channel is detected by the digital pressure gauge after adjustment by the parallel adjustment component.

[0011] Furthermore, the parallel adjustment component includes a first preset number of pairs of throttle valves and a first preset number of second air pipe joints; the second air pipe joint and the first air pipe joint are both provided with three vents; the manner in which all the throttle valves in the parallel adjustment component are connected to the main air flow channel in a parallel connection manner includes: each pair of throttle valves is connected to two vents of a second air pipe joint, wherein each pair of throttle valves includes two throttle valves, and one throttle valve corresponds to one vent connected to the second air pipe joint to control the gas flow; all the vents in the second air pipe joints that are not connected to the throttle valve are connected to one vent in one of the first air pipe joints that is not connected to the one-way valve and the main air flow channel, and each throttle valve is connected and merged into the main air flow channel; wherein the one-way valve and the main air flow channel are respectively connected to a corresponding vent of one of the first air pipe joints.

[0012] Furthermore, the throttle valve is used to adjust the intake volume by changing the area of ​​its air inlet that is blocked; wherein, each throttle valve supports manual adjustment; each throttle valve is connected to the vent hole of the corresponding second air pipe joint through its own connected pipe, and all the vent holes in the second air pipe joints that are not connected to the throttle valve are connected to a vent hole in one of the first air pipe joints that is not connected to the one-way valve and the main air flow channel through the same outlet pipe; wherein, the air pressure adjustment step of the parallel adjustment component is negatively correlated with the numerical value of the first preset number.

[0013] Furthermore, the digital barometer is an air flow meter, and the air flow sensor is a microphone; the first air pipe joint for connecting the digital barometer and the microphone is provided with a first vent, a second vent and a third vent; the first vent of the first air pipe joint is connected to the detection end of the air flow meter to expose the detection end to the inhaled air flow existing in the main air flow channel; the air flow meter is used to sense the gas flow in the main air flow channel, and then convert the gas flow into a digital signal, and configure the digital signal as the air pressure value of the main air flow channel at the first air pipe joint; wherein the voltage value of the digital signal is proportional to the air flow passing through the air flow meter; the second vent of the first air pipe joint is connected to the microphone The microphone is connected to the head, and the variable capacitor included in the microphone is composed of a diaphragm and an electrode plate arranged relative to each other, the distance between the diaphragm and the electrode plate is negatively correlated with the air pressure value of the inhaled airflow in the main airflow channel, and the distance between the diaphragm and the electrode plate is inversely proportional to the capacitance value of the variable capacitor, so that the capacitance value of the variable capacitor increases with the increase of the air pressure value of the inhaled airflow in the main airflow channel, and the capacitance value of the variable capacitor decreases with the decrease of the air pressure value of the inhaled airflow in the main airflow channel; wherein, the third air vent of the first air pipe joint is connected to the main airflow channel; when the three air vents of the first air pipe joint are arranged to be interconnected, the microphone, the air flow meter and the main airflow channel are connected.

[0014] A testing method for an airflow sensor, the testing method is configured to test the sensitivity of the airflow sensor connected to the airflow detection device; the testing method includes: starting the air pump, then adjusting the throttle valve in the parallel adjustment component until the air pressure displayed by the digital pressure gauge is within the reference negative pressure range; then turning off the air pump; after the airflow detection device is connected to the airflow sensor, powering on the airflow sensor and starting the airflow pump; then adjusting the throttle valve in the parallel adjustment component until the airflow sensor starts working, and then setting the air pressure value measured by the digital pressure gauge as the starting air pressure value and saving it; then judging whether the saved starting air pressure value falls within the preset airflow sensitivity range, if so, determining that the sensitivity of the airflow sensor is qualified, otherwise determining that the sensitivity of the airflow sensor is unqualified; wherein, the starting air pressure value is used to represent the sensitivity of the airflow sensor.

[0015] Furthermore, after the airflow sensor is powered on, during the process of the throttle valve adjusting the intake airflow in the main airflow channel, if the variable capacitor included in the airflow sensor starts to discharge to the outside and its discharge voltage is within the preset initial operating voltage range, it is confirmed that the airflow sensor has started working.

[0016] Furthermore, adjusting the throttle valve in the parallel adjustment component includes: adjusting the air intake volume of at least two throttle valves at the same time, or adjusting the air intake volume of at least two throttle valves in sequence; in the process of adjusting the throttle valve in the parallel adjustment component, the air pressure of the intake airflow in the main airflow channel changes, the distance between the diaphragm and the electrode plate is negatively correlated with the air pressure value of the intake airflow in the main airflow channel, and the distance between the diaphragm and the electrode plate is negatively correlated with the capacitance value of the variable capacitor, so that the capacitance value of the variable capacitor is positively correlated with the air pressure value of the intake airflow in the main airflow channel; wherein, the airflow sensor is a microphone sensor, and the microphone sensor includes a variable capacitor, and the variable capacitor is formed by relative arrangement of a diaphragm and an electrode plate.

[0017] Furthermore, the air pressure values ​​included in the reference negative air pressure range are all negative air pressure values, and are all configured to be air pressure values ​​required to simulate the inhalation action of a human body.

[0018] Compared with the prior art, the present application sets an air pump as an air extraction source to generate an inhaled air flow in the main air flow channel, and uses multiple throttle valves connected in parallel to adjust the air intake volume to change the air pressure in the main air flow channel. The air pressure value of the inhaled air flow is finely adjusted. Under the constraints of a certain number and occupied space volume, as the number of throttle valves connected in parallel increases, the adjustment accuracy is higher, and it can be accurate to 1 Pa unit. On this basis, the parallel adjustment component adjusts the inhaled air flow in the main air flow channel to trigger the air flow sensor to start working. If the air pressure value measured by the digital barometer is within the preset air flow sensitivity range, the air flow sensor is determined to be qualified. Otherwise, the air flow sensor is determined to be unqualified, thereby realizing the test of the external air flow sensor.

[0019] In the airflow detection device disclosed in the present application, the one-way valve connected to the air pump, the throttle valve in the parallel adjustment assembly, the digital pressure gauge and the external airflow sensor are all connected to form an integral detection device at the connection node in the same main airflow channel using an air pipe joint, so as to achieve the effect of adjustable airflow. Specifically, a smaller number of air pipe joints can be used to connect a larger number of component modules. In the present application, two first air pipe joints can be used to connect the one-way valve, the parallel adjustment assembly and the digital pressure gauge. After the parallel adjustment assembly is further disassembled into multiple throttle valves, the two first air pipe joints and the first preset number of second air pipe joints can be used to connect the one-way valve, the digital pressure gauge and twice the first preset number of throttle valves. The air paths where each throttle valve is located are merged to connect to the same main airflow channel, so that the adjustment results of the intake volume of each throttle valve connected in parallel can be merged into the main airflow channel under the condition of using fewer air valve equipment and pipelines, thereby reducing the number of components and the occupied space volume.

[0020] Because a gas pipe joint is used to connect the one-way valve, digital pressure gauge and throttle valve, the one-way valve, digital pressure gauge and throttle valve are all detachably assembled together in the airflow detection device, making the airflow detection device a detachable gas testing structure. The airflow detection device can also be set as multiple detachable equipment units for easy transportation, storage or support of individual adjustment.

[0021] In summary, the airflow detection device disclosed in this application facilitates the establishment of an inexpensive, simple, safe, and high-precision airflow sensor sensitivity testing environment. While ensuring a certain level of adjustment accuracy, the throttle valve connected in parallel can be manually adjusted to change the air pressure actively generated by the air pump in the main airflow channel, reducing control programming requirements and improving flexibility and ease of operation.

[0022] In order to conduct a sensitivity test of the airflow sensor, it is necessary to first start the air pump, then adjust the multiple throttle valves in the parallel adjustment component until the air pressure displayed by the digital pressure gauge is within the reference negative pressure range, and then turn off the air pump to simulate the air pressure environment of human inhalation in the main airflow channel. That is, before the formal test or before the airflow sensor is started, first restore the air pressure value required for the human body's inhalation action. Then, turn on the air pump and power on the airflow sensor, and then adjust the multiple throttle valves in the parallel adjustment component until the airflow sensor starts working. Then, set the air pressure value displayed by the digital pressure gauge to the starting air pressure value and record it to mark it as the sensitivity of the airflow sensor, that is, the air pressure sensitivity of the airflow sensor to the current inhalation airflow in the main airflow channel, which serves as an indicator for evaluating the detection sensitivity of the airflow sensor or its built-in chip. Then, it is determined whether the recorded starting air pressure value falls within the preset air flow sensitivity range. If so, the sensitivity of the air flow sensor is determined to be qualified; otherwise, the sensitivity of the air flow sensor is determined to be unqualified. Therefore, under the standard starting air pressure value, it is determined by parallel air flow adjustment whether the air flow sensor meets the current application requirements.

[0023] In the process of adjusting the throttle valve in the parallel adjustment component, multiple throttle valves in the parallel adjustment component can be adjusted simultaneously or in sequence, and air pressure values ​​in a variety of numerical ranges can be adjusted, which is suitable for sensitivity testing of various types of airflow sensors and improves the accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic structural diagram of an airflow detection device for airflow sensor testing disclosed in an embodiment of the present application.

[0025] Figure 2 This is a flow chart of a method for testing an airflow sensor disclosed in another embodiment of the present application. DETAILED DESCRIPTION

[0026] The specific embodiments of the present invention are further described below with reference to the accompanying drawings. In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0027] As an embodiment, an airflow detection device for testing an airflow sensor is disclosed, which is combined with Figure 1 As can be seen, the airflow detection device includes a digital pressure gauge 112, an air pump 101, a main airflow channel 100, and a parallel adjustment component; wherein the main airflow channel 100 can be connected to the outside of the airflow detection device, and the main airflow channel 100 can adopt a ventilation pipe structure (such as a soft pipe), and the air pipe connector is plugged into the main airflow channel 100 to form an airflow path. The air pump 101 is used to generate an inspiratory airflow for the main airflow channel 100, and the flow direction of the inspiratory airflow is Figure 1 The left arrow in the figure points to the direction of the air pump 101. After the air pump 101 starts working, the air source provided by the air pump 101 for the relevant ventilation channel / ventilation duct in the air flow detection device is to flow back to the air pump 101. In order to reduce the assembly space volume, the air pump 101 adopts a micro air pump or a micro motor. Optionally, the air pump 101 is connected to the main air flow channel 100 through a one-way valve or a throttle valve. The parallel adjustment component and the digital barometer 112 are arranged on the main air flow channel 100 in sequence; the main air flow channel 100 is used to connect the air flow sensor 111. The inhaled air flow existing in the main air flow channel 100 can produce a deformation effect on the air flow sensor 111 and convert it into a capacitance change to cause a charge and discharge phenomenon. Particularly after the air flow sensor 111 discharges, when the air pressure value in the main air flow channel 100 changes, the capacitance of the air flow sensor 111 will change to a certain extent. Based on this, the sensitivity test of the air flow sensor is carried out. Since the parallel adjustment component can be composed of throttle valves connected in parallel, and the air pump 101 serves as the air source of the main air flow channel 100, in this embodiment, it can be regarded as that the air pump 101, the throttle valve, the digital pressure gauge 112, and the air flow sensor 111 are arranged in sequence on the same ventilation pipe.

[0028] In this embodiment, the parallel adjustment component includes at least two throttle valves, and all the throttle valves in the parallel adjustment component are arranged on the main air flow channel 100 in a parallel connection manner to adjust the air intake volume of the main air flow channel in parallel, and can also gradually adjust the air intake volume of the main air flow channel according to the established air pressure gear. The air intake volume of the main air flow channel 100 will not be unable to continue to be adjusted due to the disconnection of the branch where one of the throttle valves is located; it also supports adjusting the intake air flow in the main air flow channel to trigger the air flow sensor to start working, and timely feedback to the digital pressure gauge 112; specifically, there are two throttle valves connected to a three-way air pipe joint, and there are another two throttle valves connected to another three-way air pipe joint, and then the air outlet holes of these two three-way air pipe joints are connected through the pipe The throttle valves are connected together and then connected to the main airflow channel 100. Since the throttle valve supports manual adjustment, the throttle valve connected to each three-way air pipe joint forms a shunt branch with adjustable airflow. Multiple shunt branches are connected to the main airflow channel 100, thereby fine-tuning the air pressure of the main airflow channel 100. The inhaled airflow in the main airflow channel 100 can be adjusted to trigger the airflow sensor 111 to start working. Under the adjustment of the parallel adjustment component, the inhaled air volume of the main airflow channel 100 will continue to change, and the airflow sensor 111 will work at different powers. When the airflow sensor 111 is applied to an electronic cigarette, the effect of using inhalation to trigger the smoking action is achieved, thereby adjusting the amount of smoke, which can simulate the smoking needs of different people. It should be noted that everyone's lung capacity is different in life, and everyone's inhalation volume is also different, resulting in different smoke output when different people smoke electronic cigarettes, making it difficult to meet the smoking needs of different customers.

[0029] The digital barometer 112 is used to measure the air pressure of the inhaled air flow in the main air flow channel 100. Specifically, after being connected to the main air flow channel 100, the digital barometer 112 can display the air pressure value in the main air flow channel 100 in real time and provide real-time feedback on the air pressure adjustment result of the throttle valve in the parallel adjustment component, making it convenient for testers to observe the air pressure value in the main air flow channel 100 or the air pressure value of the inhaled air flow sensed by the air flow sensor 111 in real time. The inhaled air flow sensed by the air flow sensor 111 is regarded as the air flow at the trachea joint 104, which is derived from the air pressure value in the main air flow channel 100 adjusted in real time by the throttle valve in the parallel adjustment component. Compared with the prior art, which does not display the power value in real time during the closed-loop feedback adjustment process, the visualization effect of the air flow detection is improved, especially in conjunction with the manual adjustment of each throttle valve, which is easy to operate.

[0030] After the parallel adjustment component adjusts the inhaled airflow in the main airflow channel 100 to trigger the airflow sensor 111 to start working, if the air pressure value measured by the digital barometer 112 is within the preset airflow sensitivity range, it is determined that the sensitivity of the airflow sensor 111 is qualified; if the air pressure value measured by the digital barometer 112 is within the preset airflow sensitivity range, it is determined that the sensitivity of the airflow sensor 111 is unqualified; preferably, the preset airflow sensitivity range is set at -200Pa to -150Pa, forming a sensitivity test standard for the airflow sensor.

[0031] The range of the digital barometer can be set so that the maximum display range of the digital barometer maintains a preset airflow sensitivity range, and the maximum display range of the digital barometer can also cover other air pressure values ​​outside the preset airflow sensitivity range, so as to effectively display the air pressure value that may be generated by the inhalation airflow in the main airflow channel 100. The preset airflow sensitivity range is maintained within the maximum range of the digital barometer. Preferably, under the regulation of the throttle valve of the parallel regulating assembly, the range of the digital barometer, expressed in air pressure units, can be between -300 Pa and -50 Pa, covering the aforementioned preset airflow sensitivity range, suitable for performing a sensitivity test of the airflow sensor. Specifically, the minimum negative air pressure value generated by the inhalation airflow when the airflow sensor 111 is in a discharge state will be displayed, which is equivalent to the air pressure value that triggers the airflow sensor 111 to start working. This minimum negative air pressure value can be defined as the starting air pressure value. In addition, when the type of the airflow sensor changes, the preset airflow sensitivity range required to be used changes, that is, when the external airflow sensor (mainly the functional type of the chip used for internal data processing) changes, then under the adjustment action of the throttle valve of the parallel adjustment component, the display range of the digital barometer will adaptively change and cover the preset airflow sensitivity range matched by the airflow sensor to be tested.

[0032] Compared with the prior art, the present application sets an air pump as an air extraction source to generate an inhaled air flow in the main air flow channel, and uses multiple throttle valves connected in parallel to adjust the air intake volume to change the air pressure in the main air flow channel. It also supports adjusting the air pressure of each channel, thereby fine-tuning the air pressure value of the inhaled air flow in the main air flow channel. Under the constraints of a certain number and occupied space volume, as the number of throttle valves connected in parallel increases, the adjustment accuracy becomes higher, and can be accurate to 1 Pa unit. On this basis, the parallel adjustment component adjusts the inhaled air flow in the main air flow channel to trigger the air flow sensor to start working. If the air pressure value measured by the digital barometer is within the preset air flow sensitivity range, the air flow sensor is determined to be qualified, otherwise it is determined that the air flow sensor is unqualified, thereby realizing the sensitivity test of the external air flow sensor.

[0033] In the above embodiment, if Figure 1 As shown, the airflow detection device also includes a one-way valve 102, which is arranged between the air pump 101 and the parallel regulating assembly. The air inlet end of the air pump 101 is connected to the main airflow channel 100 through the one-way valve 102 to prevent gas from flowing out of the air pump 101 in a single direction. The one-way valve 102 controls the direction of airflow, that is, it only allows air to flow into the air pump 101 in the direction of the arrow in the main airflow channel 100. If the air in the air pump 101 flows out due to misconnection, it may damage the airflow sensor. Therefore, the one-way valve 102 is installed in the main airflow channel 100 and between the air pump 101 and the parallel regulating assembly to prevent airflow from the air pump 101 toward the airflow sensor 111. This can prevent airflow from flowing toward the battery assembly of the airflow sensor 111 to avoid damaging the airflow sensor (causing the airflow sensor to short-circuit, etc.), prevent the sensor chip from erroneously controlling, and avoid affecting the accuracy of the measurement results of the digital barometer. It also protects the airflow sensor.

[0034] Since the one-way valve 102 controls the single flow direction of the airflow, the air pump 101 can only simulate the human body's inhalation action in the main airflow channel 100, that is, perform an inhalation action on the airflow sensor 111, but the air pump 101 cannot simulate the human body's blowing action in the main airflow channel 100, that is, cannot perform a blowing action on the airflow sensor 111.

[0035] In one embodiment, the airflow sensor 111 is a microphone; the microphone includes a variable capacitor; after the microphone 111 is activated, if the pressure of the inhaled airflow in the main airflow channel 100 increases, the capacitance of the variable capacitor increases. Specifically, the greater the pressure of the inhaled airflow in the main airflow channel 100, the greater the increase in the capacitance of the variable capacitor relative to the initial capacitance; and the smaller the pressure of the inhaled airflow in the main airflow channel 100, the less the increase in the capacitance of the variable capacitor relative to the initial capacitance. However, the capacitance does not exceed the maximum capacitance allowed by the microphone 111. That is, when the pressure of the inhaled airflow in the main airflow channel 100 increases to a level sufficient to trigger atomization, the capacitance does not change, and the discharge current does not increase. Therefore, after the pressure of the inhaled airflow exceeds the trigger threshold, there is no additional effect on the microphone. The air pressure value existing in the main air flow channel 100 when the microphone 111 is started, or the air pressure value existing in the microphone 111 when it is started, is the minimum negative air pressure value generated by the main air flow channel 100 when the microphone is in an operating state, which is equivalent to the starting working air pressure value disclosed in the aforementioned embodiment; the minimum negative air pressure value is used to indicate the sensitivity of the air flow sensor, specifically the sensitivity of the air flow sensor to sensing the inhalation action.

[0036] It should be noted that the "microphone" in this embodiment refers to a capacitive microphone. To simplify the description, it will be referred to simply as "microphone." A capacitive microphone can be equivalent to a variable capacitor. Specifically, the microphone can be implemented using a diaphragm, a gasket, and an electrode plate. The diaphragm and electrode plate are positioned opposite each other and serve as the positive and negative electrodes of a capacitor, respectively. For example, the diaphragm can serve as the positive electrode, and the electrode plate can serve as the negative electrode. A gasket is positioned between the diaphragm and the electrode plate. The gasket can be an insulating gasket made of rubber, plastic, resin, or other materials. When there is no external suction (specifically, the suction generated by the inspiratory airflow), the gasket electrically isolates the electrode plate from the diaphragm, thereby improving the stability of the microphone. The diaphragm can be implemented by combining metal and elastic materials (such as rubber, fiber cloth, etc.). When there is no external suction, the diaphragm and electrode plate form a parallel plate capacitor. When the external suction reaches a certain threshold, the diaphragm and electrode plate come into contact and conduct electricity. Depending on the degree of inhalation or exhalation by the user, the air pressure generated will also be different. When the user inhales, the diaphragm in the microphone vibrates under the user's inhalation action, thereby reducing the distance between the diaphragm and the electrode plate, that is, changing the distance between the diaphragm and the electrode plate. From electrostatics, it is known that when the dielectric constant and the area of ​​the two plates remain unchanged, the capacitance value is proportional to the dielectric constant of the medium, proportional to the area of ​​the two plates, and inversely proportional to the distance between the diaphragm and the electrode plate. Therefore, as long as the inhalation airflow exceeds the upper or lower limit of the preset airflow sensitivity range, the microphone will start working; after the microphone starts working, if the air pressure value of the inhalation airflow is adjusted to increase by the parallel adjustment component, the capacitance value of the microphone will increase, but will not exceed the maximum capacitance value of the microphone.

[0037] In some embodiments, under the regulating effect of the throttle valve on the inhaled air flow generated by the air pump, the capacitance value of the variable capacitor increases until the microphone changes from a static state to a discharged state; when the microphone changes to the discharged state, the microphone starts working; and the microphone enters a working state. The throttle valve regulates the inhaled air flow generated by the air pump 101 by adjusting the throttle valves in the parallel regulating assembly. Specifically, the throttle valve regulates the air intake volume of at least two throttle valves at the same time, or adjusts the air intake volume of at least two throttle valves in sequence. Each throttle valve is equivalent to a branch that can be connected to the main air flow channel 100. By manually or electrically adjusting multiple throttle valves in sequence, the air intake volume provided to the main air flow channel 100 by the branch can be changed. Compared with adjusting the air intake volume of only one throttle valve, the problem of excessive air pressure change caused by a single adjustment can be reduced, and the multiple throttle valves connected in parallel can achieve the effect of gradually adjusting the air pressure. Therefore, in the process of adjusting the throttle valve in the parallel adjustment component, multiple throttle valves in the parallel adjustment component can be adjusted simultaneously or in sequence, and air pressure values ​​in a variety of numerical ranges can be adjusted, which is suitable for sensitivity testing of various types of airflow sensors and improves the accuracy of the test.

[0038] The more shunt branches connected in parallel in the parallel regulation assembly, the smaller the regulation step size and the higher the regulation accuracy. The optimal regulation accuracy can be on the order of 1 Pa or less. After the microphone 111 is activated, the air pressure value measured by the digital barometer 112 is greater than the preset air pressure activation threshold. Since the air pressure value existing during the microphone's activation is the minimum negative air pressure value generated by the main air flow channel when the microphone is in operation, in order to stably cross the activation stage, the preset air pressure activation threshold in this embodiment is set to the upper limit of the preset air flow sensitivity range. When the preset air flow sensitivity range is set to -200 Pa to -150 Pa, the upper limit of the preset air flow sensitivity range is -150 Pa.

[0039] In some embodiments, within the airflow sensor 111, a variable capacitor can be connected to a pin of a control chip within the airflow sensor. Due to changes in air pressure, the capacitance of the variable capacitor increases. The control chip within the airflow sensor detects this increase in capacitance. When the capacitance increase exceeds a preset atomization trigger threshold, the control chip within the airflow sensor enters a discharge state from a static state, triggering the airflow sensor to start operating and enabling a puffing action. Furthermore, the control chip in this embodiment can utilize various existing microcontrollers, allowing for testing the sensitivity of various airflow sensors.

[0040] As an example, Figure 1As shown, the airflow detection device also includes two first air pipe joints, corresponding to Figure 1 The first air pipe joint 103 and the first air pipe joint 104 are both three-way air pipe joints. In this embodiment, in order to save the number of connected pipes and simplify the pipeline layout, a three-way air pipe joint is selected for both the first air pipe joint and the second air pipe joint. However, an air pipe joint with too many through holes cannot be selected to prevent the connection of too many throttle valves, which will cause the pipeline layout to occupy a large space. The one-way valve 102 and the parallel adjustment component are connected to one end of the main air flow channel 100 (which can be regarded as the air outlet end) through the first air pipe joint 103. Specifically, the first air pipe joint 103 is provided with two air outlet ends and one air inlet end. One air outlet end of the first air pipe joint 103 is connected to the one-way valve 102, the other air outlet end of the first air pipe joint 103 is connected to the parallel adjustment component, and the air outlet end of the first air pipe joint 104 is connected to one end of the main air flow channel 100 (which can be regarded as the air outlet end). The digital barometer 112 and the microphone 111 are connected to the other end of the main airflow channel 100 (which can be considered the air inlet end) via the first air pipe connector 104. Specifically, the first air pipe connector 104 is provided with two air inlet ends and one air outlet end. The two air inlet ends of the first air pipe connector 104 are respectively connected to the digital barometer 112 and the microphone 111, while the air outlet end of the first air pipe connector 104 is connected to the other end of the main airflow channel 100 (which can be considered the air inlet end). Thus, the main airflow channel 100 is connected to the devices for generating an air source, regulating an air source, measuring air pressure, and preventing unidirectional flow through the two first air pipe connectors. This allows the parallel regulating assembly, the airflow sensor 111, and the main airflow channel 100 to be connected, and the digital barometer 112 can detect the air pressure within the main airflow channel 100 as a result of regulation by the parallel regulating assembly.

[0041] On the basis of the above embodiment, the parallel regulating assembly includes a first preset number of pairs of throttle valves and a first preset number of second air pipe joints; the second air pipe joint and the first air pipe joint are both provided with three vents, and the vents of each air pipe joint can be distinguished as an air inlet and an air outlet according to the gas flow direction; all the throttle valves in the parallel regulating assembly are arranged in a parallel connection on the main air flow channel, including: each pair of throttle valves is connected to two vents of a second air pipe joint, wherein each pair of throttle valves includes two throttle valves, and one throttle valve is connected to each other. A vent hole of the second air pipe joint is used to control the gas flow rate; all vent holes (air outlet holes) in the second air pipe joints (105 and 106) that are not connected to the throttle valve are connected to a vent hole (for connecting to the air inlet hole of the parallel adjustment component) in the first air pipe joint 103 that is not connected to the one-way valve 102 and the main air flow channel 100, connecting each throttle valve to the main air flow channel 100; wherein the one-way valve 102 and the main air flow channel 100 are respectively connected to a corresponding vent hole of the first air pipe joint 103. In some embodiments, the air pipe joint can be implemented as a multi-vent pipe joint, which adjusts the opening and closing between the two vent holes (transmission ends) to achieve the connection and interruption between the air source provided by the air pump (or the external air source introduced by the throttle valve) and the main air flow channel, so that the air pressure values ​​of different gears can be gradually adjusted in the main air flow channel by sequentially adjusting the multiple throttle valves connected in parallel, avoiding the large air pressure changes caused by using a single throttle valve for adjustment.

[0042] Corresponding to Figure 1In the embodiment, the second air pipe joint 105 and the second air pipe joint 106 are both three-way air pipe joints, and the first preset number is 2. Then, in the parallel adjustment component, the throttle valve 107 and the throttle valve 108 form a pair of throttle valves, the outlet end of the throttle valve 107 is connected to one air inlet hole of the second air pipe joint 105, and the outlet end of the throttle valve 108 is connected to the other air inlet hole of the second air pipe joint 105. Each outlet end and the corresponding air inlet hole can be connected by a pipe (such as an air hose), thereby forming two air flow branches; the throttle valve 109 and the throttle valve 110 form a pair of throttle valves. The outlet end of throttle valve 109 is connected to one air inlet of second air pipe connector 106, and the outlet end of throttle valve 110 is connected to the other air inlet of second air pipe connector 106. Each outlet end and corresponding air inlet can be connected via a pipe (e.g., an air hose) to form two air flow branches. The outlet ends of second air pipe connector 105 and second air pipe connector 106 are respectively connected to the two air inlet ends of a Y-shaped air pipe, and the outlet end of the Y-shaped air pipe is connected to an air inlet of first air pipe connector 103, so that the air flow regulated by each throttle valve is merged into the main air flow channel 100. The other air inlet of first air pipe connector 103 is connected to check valve 102 (which can be connected via an air pipe). Therefore, each throttle valve is combined with an air pipe and a multi-ventilation pipe connector assembly to form a parallel regulating and delivery pipeline, which not only facilitates the adjustment of the current inhaled air flow in the main air flow channel 100 but also facilitates installation.

[0043] In addition, since this embodiment uses a gas pipe connector to connect the one-way valve, digital pressure gauge and throttle valve, the one-way valve, digital pressure gauge and throttle valve are all detachably assembled together in the airflow detection device, making the airflow detection device a detachable gas testing structure. The airflow detection device can also be set as multiple detachable equipment units for easy transportation, storage or support of individual adjustment.

[0044] In some embodiments, the throttle valve ( Figure 1 Any of the throttle valves (107 to 110) shown in FIG. 1 is used to adjust the intake volume by varying the area obscured by its air inlet. This adjusts the airflow volume provided by the air pump in the main airflow channel, causing the airflow sensor (microphone) to operate at different power levels. When the air pump 101 generates inhalation airflow, the air pressure within the main airflow channel 100 is adjusted to a negative value, simulating a human inhalation motion for the airflow sensor 111 (microphone). This can be used in electronic cigarettes to adjust the amount of smoke and the air pressure required to activate different airflow sensors, specifically simulating the smoking needs of different groups (i.e., the air pressure required to simulate human inhalation).

[0045] Each throttle valve supports manual adjustment; each throttle valve is connected to the vent hole of the corresponding second air pipe joint through its own connecting pipe (such as an air hose), and the vent holes in all the second air pipe joints that are not connected to the throttle valve are connected to one of the vent holes in one of the first air pipe joints that is not connected to the one-way valve and the main air flow channel through the same outlet pipe (the Y-shaped air pipe disclosed in the above embodiment), corresponding to Figure 1 That is, the air outlet holes of the second air pipe joint 105 and the second air pipe joint 106 are respectively connected to the two air inlet ends of the Y-shaped air pipe, and the air outlet end of the Y-shaped air pipe is connected to an air inlet hole of the first air pipe joint 103, so that the airflow adjusted by each throttle valve is merged into the main air flow channel 100.

[0046] In some embodiments, the throttle valve 107 is adjusted first, and the other throttle valves are not adjusted temporarily, so that the air pressure value in the main air flow channel 100 reaches the first air pressure gear and is displayed on the panel of the digital pressure gauge 112, and then the throttle valve 107 is stopped; then the throttle valve 108 is adjusted, and the other throttle valves are not adjusted temporarily, so that the air pressure value in the main air flow channel 100 reaches the second air pressure gear and is displayed on the panel of the digital pressure gauge 112, and then the throttle valve 108 is stopped. 108; then adjust the throttle valve 109, and temporarily do not adjust the other throttle valves, so that the air pressure value in the main air flow channel 100 reaches the third air pressure gear and is displayed on the panel of the digital pressure gauge 112, and then stop adjusting the throttle valve 109; then adjust the throttle valve 110, and temporarily do not adjust the other throttle valves, so that the air pressure value in the main air flow channel 100 reaches the fourth air pressure gear and is displayed on the panel of the digital pressure gauge 112, and then stop adjusting the throttle valve 110. In this way, the air pressure value in the main air flow channel 100 is gradually adjusted by sequentially adjusting the air intake volume of at least two throttle valves, and displayed as different air pressure gear information on the digital pressure gauge 112. If the air intake of two or three of the throttle valves is adjusted at the same time, for example, only throttle valve 107 and throttle valve 110 are adjusted, or throttle valve 108, throttle valve 109 and throttle valve 110 are adjusted, then other air pressure gear information can be displayed in the digital barometer 112. There is no specific restriction on the combined adjustment method of multiple throttle valves connected in parallel, but the adjustment accuracy will be higher than that when a single throttle valve is used for adjustment, avoiding large air pressure changes during each adjustment. Therefore, in the process of adjusting the throttle valves in the parallel adjustment component, the multiple throttle valves in the parallel adjustment component can be adjusted simultaneously or in sequence, and air pressure values ​​in a variety of numerical ranges can be adjusted, which is suitable for sensitivity testing of various types of airflow sensors and improves the accuracy of the test.

[0047] Preferably, a rotating bottom cover is provided in the assembly base where the throttle valve is located, the upper end of the rotating bottom cover is sleeved in the lower end of the throttle valve and is rotatably connected to the throttle valve, the throttle valve is provided with a plurality of circumferentially distributed air regulating ports, and the rotating bottom cover is provided with air inlet holes matching the corresponding air regulating ports. The air inlet of the throttle valve is an opening of the air inlet hole, and the rotating bottom cover is rotated to adjust the area of ​​the air inlet covered by the throttle valve to adjust the air intake volume, thereby controlling the air intake volume of the main air flow channel.

[0048] The rotating cover can be provided with a plurality of circumferentially distributed fasteners that engage corresponding air-regulating ports. The fasteners are snapped onto the corresponding air-regulating ports and can slide along the corresponding air-regulating ports as the rotating cover rotates, thereby adjusting the area of ​​the air inlet obscured. Furthermore, when a throttle valve is incorporated into an electronic cigarette, and the air pump generates an inhalation flow to simulate a user inhaling at the mouthpiece, the digital barometer indicates that the negative pressure generated by triggering inhalation reaches the minimum negative pressure value (the pressure required for activation). The switch is turned on, the connection circuit between the atomizer mechanism and the power supply is connected, and the heating component of the atomizer mechanism generates heat, heating the organic cotton containing the tobacco oil, atomizing it into inhalable smoke. The smoke, along with the user's inhaled air, flows through the atomizer tube of the atomizer mechanism and is then discharged from the mouthpiece for inhalation by the user. For the same inhalation volume, the area of ​​the air inlet obscured by the throttle valve can be adjusted by rotating the bottom cover, thereby adjusting the amount of air intake, thereby operating the microphone at different power levels and adjusting the amount of smoke.

[0049] It should be noted that the shape, number and area of ​​the air inlet of the throttle valve are not limited and can be set by those skilled in the art according to the actual situation. The throttle valve can be a cylindrical structure and the dimensions of each dimension of the throttle valve are about 3 cm. The parallel regulating component has a negative correlation between the air pressure regulating step length of the circulation and the numerical value of the first preset number. The larger the first preset number, the smaller the air pressure regulating step length and the higher the regulating accuracy. However, due to the overall occupied space, the first preset number will not increase indefinitely. Figure 1 In the example, the first preset number is set to a value of 2 to set the air pressure adjustment accuracy to the air pressure unit Pascal.

[0050] Preferably, the air inlet of each throttle valve is connected to the external gas environment, so that when the vacuum pump stops working, the gas in the external gas environment flows from the throttle valve into the airflow detection device, so that the air pressure value in the main airflow channel becomes equal to the standard atmospheric pressure value, thereby achieving air pressure balance inside and outside the main airflow channel.

[0051] On the basis of the above embodiment, the digital barometer 112 is an air flow meter 112, and the air flow sensor 111 is a microphone 111; Figure 1As can be seen, the first air pipe connector 104 for connecting the digital barometer 112 and the microphone 111 is provided with a first vent, a second vent, and a third vent. The first air pipe connector 104 is a three-way air pipe connector. The first vent of the first air pipe connector 104 is connected to the detection end of the air flow meter 112 so as to expose the detection end to the inhaled air flow in the main air flow channel 100, wherein the first air pipe connector 104 and the main air flow channel 100 are arranged to be connected. The air flow meter 112 is used to sense the gas flow in the main air flow channel 100, and then convert the gas flow into a digital signal, and configure the digital signal as the air pressure value of the main air flow channel 100 at the first air pipe connector. The voltage value of the digital signal is proportional to the air flow through the air flow meter 112 (because the air flow is converted into a voltage value through analog-to-digital conversion). The detection end of the air flow meter 112 can be set at the air inlet of the air flow meter 112, or it can exist in the form of a negative electrode. In addition, the second vent hole of the first air pipe joint 104 is connected to the microphone 111. Based on the aforementioned relevant embodiments, it can be known that the variable capacitor included in the microphone 111 is composed of a diaphragm and an electrode plate arranged relative to each other, and the distance between the diaphragm and the electrode plate is negatively correlated with the air pressure value of the inspiratory airflow in the main airflow channel 100, and the distance between the diaphragm and the electrode plate is inversely proportional to the capacitance value of the variable capacitor, so that the capacitance value of the variable capacitor increases with the increase of the air pressure value of the inspiratory airflow in the main airflow channel 100, and the capacitance value of the variable capacitor decreases with the decrease of the air pressure value of the inspiratory airflow in the main airflow channel 100. Now it is reduced, so that the change in the capacitance value of the variable capacitor reflects the change in the air pressure value in the main airflow channel 100. Then, when simulating the human body's inhalation action, the change in the capacitance value of the airflow sensor 111 represents the airflow intensity generated when the user inhales; under the adjustment action of the throttle valve (the adjustment action of the intake volume), when the change in the capacitance value of the variable capacitor relative to the initial capacitance value exceeds the preset atomization trigger threshold, the airflow sensor 111 starts to work. At this time, the air pressure value existing in the main airflow channel 100 is the minimum negative air pressure value and can be displayed by the air flow meter 112, which represents the sensitivity of the airflow sensor.

[0052] The third vent hole of the first air pipe joint 104 is connected to the main air flow channel 100; when the three vent holes of the first air pipe joint 104 are arranged to be connected to each other, the microphone 111, the air flow meter 112 and the main air flow channel 100 are connected. Therefore, in the airflow detection device disclosed in this embodiment, the one-way valve connected to the air pump, the throttle valve in the parallel adjustment assembly, the digital pressure gauge, and the external airflow sensor are all connected to form an integral detection device at the connection node (or confluence point) in the same main airflow channel using an air pipe joint, so as to achieve the effect of adjustable airflow. Specifically, a smaller number of air pipe joints can be used to connect a larger number of component modules. In this application, two first air pipe joints can be used to connect the one-way valve, the parallel adjustment assembly, and the digital pressure gauge. After the parallel adjustment assembly is further disassembled into multiple throttle valves, the two first air pipe joints and a first preset number of second air pipe joints can be used to connect the one-way valve, the digital pressure gauge, and twice the first preset number of throttle valves. The air paths of each throttle valve are merged to connect to the same main airflow channel, so that the adjustment results of the intake air volume of each throttle valve connected in parallel can be merged into the main airflow channel under the condition of using fewer air valve equipment and pipelines, thereby reducing the number of components and the occupied space volume.

[0053] In summary, the airflow detection device disclosed in this application facilitates the establishment of an inexpensive, simple, safe, and high-precision airflow sensor sensitivity testing environment. While ensuring a certain level of adjustment accuracy, the throttle valve connected in parallel can be manually adjusted to change the air pressure actively generated by the air pump in the main airflow channel, reducing control programming requirements and improving flexibility and ease of operation.

[0054] Based on the airflow detection device for airflow sensor testing disclosed in the aforementioned embodiment, the present application also discloses a testing method for the airflow sensor. The basic concept of the testing method is based on the adjustment and detection of the inhalation airflow generated by the suction pump by the aforementioned airflow detection device. Therefore, the testing method is configured to test the sensitivity of the airflow sensor connected to the airflow detection device. The executor of the testing method can be a microcontroller electrically connected to the airflow detection device, which can automatically control the airflow detection device to test the sensitivity of the external airflow sensor, and can be manually adjusted for coordination when necessary.

[0055] Combine Figure 1 and Figure 2 It can be seen that the testing method includes:

[0056] Step S201, start the air pump 101, then adjust the throttle valve in the parallel adjustment component until the air pressure displayed by the digital pressure gauge 112 is within the reference negative pressure range, so as to simulate the human inhalation action, or even the air pressure environment required for smoking action, in the main air flow channel 100, create an initial air pressure environment, and then turn off the air pump 101, thereby completing the initialization of the airflow test environment; then execute step S202.

[0057] Step S202: After the airflow detection device is connected to the airflow sensor 111, power is supplied to the airflow sensor 111 and the air extraction pump 101 is turned on. At this point, the airflow sensor has not yet started working. After powering on, it can receive the air pressure force exerted by the inhaled airflow generated by the air extraction pump 101 in the main airflow channel 100, causing deformation and converting it into a change in capacitance. Furthermore, the one-way valve 102 prevents the airflow from unidirectionally impacting the airflow sensor 111. Then, step S203 is executed.

[0058] Step S203, adjust the throttle valve in the parallel adjustment component until the airflow sensor 111 starts working, then set the air pressure value displayed by the digital barometer 112 as the starting air pressure value and record it to form the minimum air pressure value or initial air pressure value sensed by the airflow sensor 111 in the working state; then execute step S204.

[0059] Specifically, adjusting the throttle valves in the parallel adjustment assembly includes: adjusting the air intake of at least two throttle valves simultaneously, or adjusting the air intake of at least two throttle valves sequentially; the adjustment here can be performed by a microcontroller sending an electrical signal to control the airflow rate of the branch path where each throttle valve is located. For example, the microcontroller is connected to the adjustable end of the throttle valve through a switch circuit, and then sends a PWM signal to perform high and low level pulse width adjustment, thereby changing the area of ​​the throttle valve's air intake that is blocked by the rotating cover. In this way, by adjusting the multiple throttle valves connected in parallel sequentially or simultaneously in the main air flow channel, the air pressure values ​​of different gears can be gradually adjusted, avoiding the large air pressure changes caused by using a single throttle valve for adjustment. Therefore, in the process of adjusting the throttle valve in the parallel adjustment component, the multiple throttle valves in the parallel adjustment component can be adjusted simultaneously or in sequence, and the air pressure values ​​in a variety of numerical ranges can be adjusted to adapt to the sensitivity test of various types of airflow sensors, thereby improving the accuracy of the test; at the same time, the adjustment program design for each throttle valve is flexible, and it is only necessary to adjust the air intake volume in the diversion branch where each throttle valve is located to make the air pressure value of the main airflow channel fall into the established reference negative air pressure range or trigger the discharge voltage of the variable capacitor included in the airflow sensor to fall into the preset initial working voltage range.

[0060] During step S203, the pressure of the inspiratory airflow in the main airflow channel changes, the distance between the diaphragm and the electrode plate is negatively correlated with the pressure of the inspiratory airflow in the main airflow channel, and the distance between the diaphragm and the electrode plate is negatively correlated with the capacitance of the variable capacitor, so that the capacitance of the variable capacitor is positively correlated with the pressure of the inspiratory airflow in the main airflow channel. The airflow sensor is a microphone sensor comprising a variable capacitor formed by the diaphragm and the electrode plate being arranged relative to each other. Thus, the pressure change of the inspiratory airflow is reflected by detecting the capacitance change of the microphone sensor, and can be monitored using the visual results of the digital barometer.

[0061] When testing the microphone sensor of an electronic cigarette, as long as the pressure of the inhaled airflow exceeds the activation pressure value (which can serve as the minimum pressure threshold for triggering a puff), the microphone sensor will activate. At this time, the microphone sensor will trigger a puff prompt signal to facilitate the user's puffing. After the microphone sensor is activated, if the pressure of the inhaled airflow increases, the capacitance value of the microphone sensor will increase, but will not exceed the maximum capacitance value allowed by the microphone sensor. In some embodiments, after the pressure of the inhaled airflow exceeds the preset maximum puff triggering threshold, the two electrode plates of the microphone may come into contact, and the capacitance value of the microphone sensor will no longer change. The maximum puff triggering threshold is greater than the activation pressure value.

[0062] Step S204 , determining whether the recorded starting air pressure value falls within a preset airflow sensitivity range, if so, executing step S205 , otherwise executing step S206 .

[0063] Step S205 determines that the sensitivity of the airflow sensor is qualified; step S206 determines that the sensitivity of the airflow sensor is unqualified; wherein the starting air pressure value is used to represent the sensitivity of the airflow sensor.

[0064] Preferably, with respect to the aforementioned steps S202 and S203, after the airflow sensor is powered on in step S202, during the process of the throttle valve regulating the inhaled airflow in the main airflow channel 100, if the variable capacitor included in the airflow sensor 111 begins to discharge to the outside and its discharge voltage is within a preset initial operating voltage range, it is confirmed that the airflow sensor 111 has started to work. At this time, the air pressure value in the main airflow channel 100 is greater than or equal to the starting air pressure value. It should be supplemented that the air pressure value existing in the main airflow channel 100 when the microphone 111 starts to work, or the air pressure value existing in the microphone 111 when it starts to work, is the minimum negative air pressure value generated in the main airflow channel 100 when the microphone is in the working state, which is equivalent to the starting working air pressure value disclosed in the aforementioned embodiment. This minimum negative air pressure value is used to indicate the sensitivity of the airflow sensor.

[0065] Therefore, based on the above steps, in order to conduct a sensitivity test of the airflow sensor, it is necessary to first start the air pump, then adjust the throttle valve in the parallel regulating assembly until the air pressure displayed by the digital barometer is within the reference negative pressure range, and then turn off the air pump to simulate the air pressure environment of human inhalation in the main airflow channel, that is, before the formal test or before the airflow sensor is started, first restore the air pressure value required for the human inhalation action or form a reference air pressure test environment. Then start the air pump and power on the airflow sensor, and then adjust the throttle valve in the parallel regulating assembly until the airflow sensor starts working, and then set the air pressure value displayed by the digital barometer to the starting air pressure value and record it to mark it as the sensitivity of the airflow sensor, that is, the pressure sensitivity of the airflow sensor to the current inhalation airflow in the main airflow channel, which serves as an indicator for evaluating the detection sensitivity of the airflow sensor or its built-in chip. Then, it is determined whether the recorded starting air pressure value falls within the preset air flow sensitivity range. If so, the sensitivity of the air flow sensor is determined to be qualified; otherwise, the sensitivity of the air flow sensor is determined to be unqualified. Therefore, under the standard starting air pressure value, it is determined by parallel air flow adjustment whether the air flow sensor meets the current application requirements.

[0066] Preferably, the reference negative pressure range disclosed in step S201 includes all negative pressure values ​​and is configured to simulate the pressure required for human inhalation. Depending on the chip model of the airflow sensor, the reference negative pressure range may be set differently. For example, -250 Pa may indicate a smoking state within the reference negative pressure range corresponding to one airflow sensor, but may not successfully trigger a puff within the reference negative pressure range corresponding to another airflow sensor.

[0067] Preferably, after the vacuum pump 101 is turned off, external gas will flow into the main air flow channel 100 and other connected air pipes from the throttle valve, and the air pressure in the air pipe will gradually become equal to the standard atmospheric pressure. The air pressure value in the main air flow channel 100 becomes positive, so it is not in the inhalation state or the smoking state.

[0068] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0069] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0070] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0071] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0072] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0073] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An airflow detection device for airflow sensor testing, characterized in that: The airflow detection device includes a digital air pressure gauge, an air pump, a main airflow channel and a parallel adjustment component; The suction pump is used to generate an inspiratory airflow for the main airflow channel; The parallel regulating assembly and the digital pressure gauge are sequentially arranged on the main air flow channel; The main air flow channel is used to connect the air flow sensor; the parallel regulating assembly includes at least two throttle valves, and all the throttle valves in the parallel regulating assembly are arranged on the main air flow channel in a parallel connection manner; The digital barometer is used to measure the pressure of the inspiratory airflow in the main airflow channel; The parallel regulating component regulates the inhaled air flow in the main air flow channel to trigger the air flow sensor to start working. If the air pressure value measured by the digital barometer is within the preset air flow sensitivity range, the sensitivity of the air flow sensor is determined to be qualified. The airflow detection device further comprises a one-way valve, which is arranged between the air extraction pump and the parallel regulating assembly; The air inlet end of the air pump is connected to the main air flow channel through the one-way valve to prevent the gas from flowing out of the air pump in one direction; The airflow sensor is a microphone; the microphone includes a variable capacitor; after the microphone is started, if the pressure of the inhaled airflow in the main airflow channel increases, the capacitance value of the variable capacitor increases, but does not exceed the maximum capacitance value allowed by the microphone; after the microphone is started, if the pressure of the inhaled airflow in the main airflow channel decreases, the capacitance value of the variable capacitor decreases; The air pressure value of the main air flow channel when the microphone is started, or the air pressure value of the microphone when it is started, is the minimum negative air pressure value of the main air flow channel when the microphone is in an operating state, and the minimum negative air pressure value is used to indicate the sensitivity of the air flow sensor; The airflow detection device further comprises two first air pipe joints; The one-way valve and the parallel adjustment component are connected to one end of the main air flow channel through one of the first air pipe joints, and the digital pressure gauge and the microphone are connected to the other end of the main air flow channel through the other first air pipe joint, so that when the parallel adjustment component, the air flow sensor and the main air flow channel are connected, the digital pressure gauge can detect the air pressure value in the main air flow channel as a result of adjustment by the parallel adjustment component.

2. The airflow detection device according to claim 1, characterized in that: Under the regulating effect of the throttle valve on the suction airflow generated by the air pump, the capacitance value of the variable capacitor increases until the microphone changes from a static state to a discharged state; when the microphone changes to the discharged state, the microphone starts to work; After the microphone is started, the air pressure value measured by the digital barometer is greater than a preset air pressure start threshold, wherein the preset air pressure start threshold is an upper limit value of a preset air flow sensitivity range.

3. The airflow detection device according to claim 1, characterized in that: The parallel regulating assembly includes a first preset number of throttle valves and a first preset number of second air pipe joints; the second air pipe joints and the first air pipe joints are both provided with three vents; The manner in which all the throttle valves in the parallel regulating assembly are arranged in parallel on the main air flow channel includes: Each pair of throttle valves is connected to two vents of a second air pipe connector, wherein each pair of throttle valves includes two throttle valves, and one throttle valve is connected to one vent of the second air pipe connector to control the gas flow; All the vent holes in the second air pipe joints that are not connected to the throttle valve are connected to one vent hole in one of the first air pipe joints that is not connected to the one-way valve and the main air flow channel, so that each throttle valve is connected to the main air flow channel; Wherein, the one-way valve and the main air flow channel are respectively connected to a corresponding vent hole of one of the first air pipe joints.

4. The airflow detection device according to claim 3, characterized in that: The throttle valve is used to adjust the intake volume by changing the area of ​​the air inlet thereof covered; wherein each throttle valve supports manual adjustment; each throttle valve is connected to the corresponding vent hole of the second air pipe joint via a respective connecting pipe, and all vent holes in the second air pipe joint that are not connected to the throttle valve are connected to a vent hole in one of the first air pipe joints that is not connected to the one-way valve and the main air flow channel via the same outlet pipe; The parallel regulating assembly regulates the circulating air pressure in a step-by-step manner and has a negative correlation with the value of the first preset number.

5. The airflow detection device according to claim 4, characterized in that: The digital barometer is an air flow meter, and the air flow sensor is a microphone; The first air pipe joint for connecting the digital pressure gauge and the microphone is provided with a first air vent, a second air vent and a third air vent; The first vent hole of the first air pipe joint is connected to a detection end of an air flow meter so as to expose the detection end to the inhaled air flow in the main air flow channel; the air flow meter is used to sense the gas flow in the main air flow channel, convert the gas flow into a digital signal, and configure the digital signal as an air pressure value of the main air flow channel at the first air pipe joint; wherein the voltage value of the digital signal is proportional to the air flow passing through the air flow meter; The second vent hole of the first tracheal joint is connected to the microphone. The microphone includes a variable capacitor composed of a diaphragm and an electrode plate arranged relative to each other. The distance between the diaphragm and the electrode plate is negatively correlated with the pressure of the inspiratory airflow in the main airflow channel, and the distance between the diaphragm and the electrode plate is inversely proportional to the capacitance value of the variable capacitor, so that the capacitance value of the variable capacitor increases with the increase of the pressure value of the inspiratory airflow in the main airflow channel, and the capacitance value of the variable capacitor decreases with the decrease of the pressure value of the inspiratory airflow in the main airflow channel. Among them, the third vent hole of the first trachea joint is connected to the main air flow channel; when the three vent holes of the first trachea joint are set to be connected to each other, the microphone, the air flow meter and the main air flow channel are connected.

6. A method for testing an airflow sensor, characterized in that: The testing method is configured to test the sensitivity of an airflow sensor connected to the airflow detection device according to any one of claims 1 to 5; The test method includes: Start the vacuum pump, and then adjust the throttle valve in the parallel regulating assembly until the air pressure displayed on the digital pressure gauge is within the reference negative pressure range; then turn off the vacuum pump; After the airflow detection device is connected to the airflow sensor, the airflow sensor is powered on and the air pump is turned on; Then adjust the throttle valve in the parallel regulating assembly until the air flow sensor starts working, and then set the air pressure value measured by the digital pressure gauge as the starting air pressure value and save it; Then, it is determined whether the saved starting air pressure value falls within the preset airflow sensitivity range. If so, it is determined that the sensitivity of the airflow sensor is qualified; otherwise, it is determined that the sensitivity of the airflow sensor is unqualified; wherein, the starting air pressure value is used to represent the sensitivity of the airflow sensor.

7. The testing method according to claim 6, characterized in that: After the airflow sensor is powered on, during the process of the throttle valve adjusting the intake airflow in the main airflow channel, if the variable capacitor included in the airflow sensor starts to discharge to the outside and its discharge voltage is within the preset initial operating voltage range, it is confirmed that the airflow sensor has started working.

8. The testing method according to claim 6, characterized in that: The method of adjusting the throttle valves in the parallel adjustment assembly includes: adjusting the air intake of at least two throttle valves simultaneously, or adjusting the air intake of at least two throttle valves in sequence; During the process of adjusting the throttle valve in the parallel adjustment component, the air pressure of the inhaled airflow in the main airflow channel changes, the distance between the diaphragm and the electrode plate is negatively correlated with the air pressure value of the inhaled airflow in the main airflow channel, and the distance between the diaphragm and the electrode plate is negatively correlated with the capacitance value of the variable capacitor, so that the capacitance value of the variable capacitor is positively correlated with the air pressure value of the inhaled airflow in the main airflow channel; wherein, the airflow sensor is a microphone sensor, and the microphone sensor includes a variable capacitor, and the variable capacitor is formed by a diaphragm and an electrode plate arranged relative to each other.

9. The testing method according to claim 6, characterized in that: The air pressure values ​​included in the reference negative air pressure range are all negative air pressure values, and are all configured to simulate the air pressure values ​​required for the inhalation action of the human body.

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