Air flow sensor test device with adjustable air pressure and test method

Abstract

The present application discloses an air flow sensor test device with adjustable air pressure and a test method, the air flow sensor test device includes a digital barometer, an air suction pump, a main air flow channel and a series adjustment component; the air suction pump is used to provide an inhaled air flow to the main air flow channel; the series adjustment component and the digital barometer are sequentially arranged on the main air flow channel; the main air flow channel is used to connect the air flow sensor; the series adjustment component includes at least two throttle valves, and all the throttle valves in the series adjustment component are arranged in the main air flow channel in a series-connected manner; in the process of adjusting the inhaled air flow, external air enters the series adjustment component, and all the throttle valves in the series adjustment component are opened; the digital barometer is used to measure the air pressure value of the inhaled air flow in the main air flow channel; after the series adjustment component triggers the air flow sensor to start working, if the air pressure value measured by the digital barometer is within a preset air flow sensitivity range, it is determined that the sensitivity of the air flow sensor is qualified.

Description

Technical Field

[0001] The present application relates to the technical field of testing airflow sensors, and in particular to an airflow sensor testing device and a testing method with adjustable air pressure. Background Art

[0002] The sensitivity detection of electronic cigarettes to user inhalation in the existing market mainly refers to the well-known electronic cigarette airflow sensor sensitivity detection. It uses a sampling circuit to sample the voltage of the microphone (airflow sensor), then an amplifier circuit amplifies the voltage, and finally an analog / digital conversion microcontroller identifies and processes it. The identified air pressure value may be displayed on a barometer to indicate the airflow pressure in the trachea, but the pressure cannot be adjusted on the panel.

[0003] The air path connected to the air flow sensor may be designed as a parallel-connected air path. For example, the air pressure valve is connected in parallel with the actuator, or multiple air pressure valves are connected in parallel. The adjustment step of each air pressure is small, and the parallel-connected air paths will increase the use of air pipe joints, which may increase the complexity of the air path layout, increase costs and increase the size of the equipment. Summary of the Invention

[0004] This application discloses a pressure-adjustable airflow sensor testing device and testing method. The specific technical solutions are as follows:

[0005] A pressure-adjustable airflow sensor testing device includes a digital barometer, an air extraction pump, a main airflow channel, and a series adjustment assembly. The air extraction pump is configured to provide an inhaled airflow to the main airflow channel. The series adjustment assembly and the digital barometer are sequentially disposed on the main airflow channel. The main airflow channel is configured to connect to an airflow sensor. The series adjustment assembly includes at least two throttle valves, all of which are disposed in series in the main airflow channel to support gradual adjustment of the inhaled airflow within the main airflow channel. During the adjustment of the inhaled airflow, external air enters the series adjustment assembly, and all of the throttle valves in the series adjustment assembly are open. The digital barometer is configured to measure the pressure of the inhaled airflow within the main airflow channel. After the series adjustment assembly adjusts the inhaled airflow within the main airflow channel to trigger the airflow sensor to start operation, if the pressure measured by the digital barometer is within a preset airflow sensitivity range, the airflow sensor is determined to have qualified sensitivity. When the type of the airflow sensor changes, the preset airflow sensitivity range required to be used changes. The maximum display range of the digital barometer maintains coverage of the preset airflow sensitivity range.

[0006] Furthermore, the airflow sensor testing device also includes two first air pipe joints; the airflow sensor testing device also includes a one-way valve, which is arranged between the air pump and the series 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; the one-way valve and the series 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 another first air pipe joint, so that the series 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 series adjustment component.

[0007] Furthermore, the series regulating component includes a first preset number of throttle valves; the manner in which all the throttle valves in the series regulating component are arranged in a serially connected manner on the main air flow channel includes: among the first preset number of throttle valves, there is a first-stage throttle valve connected to one of the first air pipe joints, a last-stage throttle valve connected to the external air, and the remaining throttle valves, and the remaining throttle valves are connected in series to the first-stage throttle valve and the last-stage throttle valve; among the first preset number of throttle valves, the air outlet of the first-stage throttle valve is connected to one of the first air pipe joints There is no air vent in the joint that is connected to the one-way valve and the main air flow channel. The air inlet of the first-stage throttle valve is connected to the air outlet of the adjacent throttle valve; the air inlet of the last-stage throttle valve is connected to the external air, and the air outlet of the last-stage throttle valve is connected to the air inlet of the adjacent throttle valve; between the first-stage throttle valve and the last-stage throttle valve, in the flow direction of the gas flowing into the main air flow channel, the air inlet of each throttle valve is connected to the air outlet of the adjacent subsequent throttle valve, or the air outlet of each throttle valve is connected to the air outlet of the adjacent previous throttle valve.

[0008] Furthermore, the throttle valve is used to adjust the intake volume by changing the area of ​​the air inlet covered by it; wherein, each throttle valve supports manual adjustment; the air pressure adjustment step of the series adjustment component for the main air flow channel is negatively correlated with the numerical value of the first preset number.

[0009] 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 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 variable capacitor included in the microphone is connected by a diaphragm and an electrode plate relatively arranged, 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.

[0010] Furthermore, 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; 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.

[0011] 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.

[0012] A testing method for an airflow sensor, the testing method is configured to operate the airflow sensor testing device; the testing method includes: starting an air pump, then adjusting at least one throttle valve until the air pressure displayed by the digital pressure gauge is within a reference negative pressure range; then turning off the air pump; after the airflow sensor testing device is connected to the airflow sensor, powering the airflow sensor and starting the airflow pump; then adjusting at least one throttle valve until the airflow sensor starts working, and then setting the air pressure value measured by the digital pressure gauge as the starting pressure value and saving it; then judging whether the saved starting pressure value falls within a preset airflow sensitivity range, and 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 pressure value is used to represent the sensitivity of the airflow sensor.

[0013] 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.

[0014] Furthermore, the method of adjusting at least one throttle valve includes: after each throttle valve of the series adjustment assembly is opened, introducing external air into the main air flow channel; among all the throttle valves connected between a throttle valve to be adjusted and the first air pipe joint, if at least one throttle valve is adjusted, the change in the intake volume of the adjusted throttle valve is fed back to the main air flow channel, so that in the process of sequentially adjusting each throttle valve connected in series to the throttle valve to be adjusted, the air pressure value of the main air flow channel is gradually adjusted; wherein, each adjustment of a throttle valve corresponds to An air pressure value is generated in the main air flow channel, and corresponds to each step of adjustment of the air pressure in the main air flow channel; wherein, at least one throttle valve is connected in series between the throttle valve to be adjusted and the first air pipe joint, or the throttle valve to be adjusted is connected to the first air pipe joint; wherein, the air flow sensor testing device includes two first air pipe joints; the one-way valve and the series 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 air flow sensor are connected to the other end of the main air flow channel through the other first air pipe joint.

[0015] Furthermore, in the series adjustment component, if the throttle valve connected to the external air is closed, during the process of adjusting any throttle valve in the series adjustment component, the intake volume generated by the adjusted throttle valve cannot be fed back to the main air flow channel, and it is determined that the adjustment of any throttle valve is invalid.

[0016] Furthermore, in the series adjustment component, if the throttle valve connected to the first air pipe joint is closed, during the process of adjusting any other throttle valve in the series adjustment component, the intake volume of the adjusted throttle valve will not be fed back to the main air flow channel, and it is determined that the adjustment of any other throttle valve in the series adjustment component is invalid.

[0017] 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 series to gradually (step by step within a certain limit) adjust the air intake volume to gradually change the air pressure in the main air flow channel, prevent the air pressure value of the inhaled air flow from suddenly changing, and improve the test accuracy. As the number of throttle valves connected in series increases, the adjustment accuracy becomes higher, and under the constraints of a certain number and occupied space volume, compared with throttle valves connected in parallel, there is no need to assemble air pipe joints, or the number of air pipe joints can be reduced to half the number of throttle valves. From the perspective of the circuit, if any throttle valve is disconnected, the other throttle valves will stop working. The series adjustment component can be equivalent to a single-circuit adjustment system. Compared with the throttle valves connected in parallel, the number of circuit settings can be reduced and the volume of the device can be reduced.

[0018] On this basis, after the series 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 pressure gauge is within the preset airflow sensitivity range, the airflow sensor is determined to be qualified; otherwise, the airflow sensor is determined to be unqualified. Therefore, it is only necessary to pay attention to the minimum negative air pressure value for the start-up of the airflow sensor, and a single-loop adjustment system can be used to verify the sensitivity of the airflow sensor.

[0019] Specifically, in the airflow sensor test device disclosed in the present application, the one-way valve connected to the air pump, the throttle valve in the series 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, which achieves 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 series adjustment assembly, and the digital pressure gauge. Moreover, there is no need to use air pipe joints to connect the multiple throttle valves in the series adjustment assembly. The series adjustment assembly connects the air paths where each throttle valve is located in series and then connects them to the same main airflow channel through the first air pipe joint. Under the condition of using fewer air pipe joints, the adjustment result of the intake volume by each throttle valve connected in series is first fed back to the series branch and then fed back to the main airflow channel; thereby reducing the number of components and the occupied space volume.

[0020] Moreover, 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 sensor test device, making the airflow sensor test device a detachable gas testing structure. The airflow sensor test device can also be set as multiple detachable equipment units for easy transportation and storage.

[0021] In the test method, all throttle valves connected to the first air pipe joint introduce external air into the main air flow channel, thereby effectively calling the relevant throttle valves in the series adjustment assembly to adjust the air pressure. Specifically, after each throttle valve in the series adjustment assembly is opened, external air is introduced into the main air flow channel, thereby forming the necessary conditions for calling all throttle valves in the series adjustment assembly to adjust the air pressure in the main air flow channel. Among all the throttle valves connected to the first air pipe joint, if at least one throttle valve is adjusted, the changes in the intake volume of all the adjusted throttle valves are fed back to the main air flow channel, which is equivalent to adjusting the air pressure in the series branch where the throttle valve is located. Moreover, each adjustment of a throttle valve corresponds to a corresponding air pressure value, which corresponds to each step of the air pressure adjustment in the main air flow channel. In this way, in the process of sequentially adjusting each throttle valve connected in series to the throttle valve to be adjusted, the air pressure value of the main air flow channel is gradually adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of an airflow sensor testing device with adjustable air pressure disclosed in an embodiment of the present application.

[0023] 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

[0024] 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.

[0025] As an embodiment, a pressure-adjustable airflow sensor testing device is disclosed, which is combined with Figure 1As can be seen, the airflow sensor test device includes a digital barometer 110, an air pump 101, a main airflow channel 100, and a series adjustment component; wherein the main airflow channel 100 can be connected to the outside of the airflow sensor test 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 provide an inspiratory airflow to 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 that, after the air pump 101 starts working, the air source provided by the air pump 101 to the relevant ventilation channel / ventilation pipe in the air flow sensor test device flows back to the air pump 101. In order to reduce the volume of the assembly space, 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. The series 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 109. The inhaled air flow in the main air flow channel 100 will produce a deformation effect on the air flow sensor 109 and convert it into a capacitance change to cause a charge and discharge phenomenon. In particular, after the air flow sensor 109 is discharged, when the air pressure value in the main air flow channel 100 changes, the capacitance of the air flow sensor 109 will change to a certain extent, and the sensitivity test of the air flow sensor is performed based on this. Since the series regulation component can be composed of throttle valves connected in series, from the perspective of the circuit, if any throttle valve is disconnected, the other throttle valves will stop working. The series regulation component can be equivalent to a single-loop regulation system, which can reduce the number of loop settings compared to throttle valves connected in parallel; wherein, the vacuum pump 101 serves as the air source of the main air flow channel 100, and the throttle valve in the series regulation component can be connected to the outside air to form an adjustable air source.

[0026] In this embodiment, the series regulating assembly includes at least two throttle valves, and all the throttle valves in the series regulating assembly are arranged in the main air flow channel in a serially connected manner to support the gradual adjustment of the inhalation airflow in the main air flow channel. It should be noted that in the process of adjusting the inhalation airflow, external air enters the series regulating assembly, and all the throttle valves in the series regulating assembly are open. Only after the throttle valve connected to the external air is opened will the airflow be introduced into the series regulating assembly, and cooperate with the air pump 101 to form an adjustable part of the inhalation airflow, corresponding to Figure 1 In the figure, the external air starts to come in from the throttle valve 108 on the far right. During the implementation process, the air intake volume of the throttle valve 108 will be adjusted to the maximum, and then the air intake volume of the corresponding throttle valve will be gradually adjusted to a smaller value from right to left, which can support the gradual adjustment of the intake airflow in the main airflow channel 100.

[0027] In this embodiment, each adjustment of a throttle valve corresponds to generating an air pressure value, and corresponds to each step of adjustment of the air pressure in the main air flow channel; the series adjustment component also supports adjusting the inhaled 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 110; specifically, all the throttle valves in the series adjustment component are connected in series to a three-way air pipe joint, and can be connected to the main air flow channel 100 through the air outlet of the three-way air pipe joint; because the throttle valve supports manual adjustment, each throttle valve is connected in series to form a branch with adjustable air flow and air pressure, which reduces the installation time. Equipped with a three-way air pipe joint for diversion processing, the main air flow channel 100 can be fine-tuned to a greater extent than the throttle valve connected in parallel. Of course, it supports gradual and step-by-step pressure adjustment, and can adjust the inhalation airflow in the main air flow channel 100 to trigger the airflow sensor 109 to start working. Under the adjustment of the series adjustment component, the inhalation volume of the main air flow channel 100 will continue to change, and the airflow sensor 109 will work at different powers. When the airflow sensor 109 is applied to the electronic cigarette, the effect of using inhalation to trigger the smoking action is achieved, thereby adjusting the size of the smoke volume, 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.

[0028] The digital barometer 110 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 110 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 series adjustment component, so that the tester can conveniently 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 109 in real time. The inhaled air flow sensed by the air flow sensor 109 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 series 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.

[0029] After the series adjustment component adjusts the inhaled airflow in the main airflow channel 100 to trigger the airflow sensor 109 to start working, if the air pressure value measured by the digital pressure gauge 110 is within the preset airflow sensitivity range, it is determined that the sensitivity of the airflow sensor 110 is qualified; if the air pressure value measured by the digital pressure gauge 110 is within the preset airflow sensitivity range, it is determined that the sensitivity of the airflow sensor 110 is unqualified; preferably, the preset airflow sensitivity range is set at -200Pa to -150Pa, forming a sensitivity test standard for the airflow sensor.

[0030] 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 and is applicable to different types of airflow sensors. Preferably, under the adjustment of the throttle valve of the series adjustment assembly, the range of the digital barometer, when expressed in air pressure units, can display air pressure values ​​between -300 Pa and -50 Pa, covering the aforementioned preset airflow sensitivity range, suitable for performing sensitivity testing of the airflow sensor. Specifically, the minimum negative air pressure value generated by the inhalation airflow when the airflow sensor 109 is in a discharge state is displayed, which is equivalent to the air pressure value that triggers the airflow sensor 109 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 series adjustment component, the display range of the digital pressure gauge will adaptively change and cover the preset airflow sensitivity range matched by the airflow sensor to be tested.

[0031] 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 series to gradually (step by step within a certain limit) adjust the air intake volume to gradually change the air pressure in the main air flow channel, prevent the air pressure value of the inhaled air flow from suddenly changing, and improve the test accuracy. As the number of throttle valves connected in series increases, the adjustment accuracy becomes higher, and it can be accurate to 1pa units. Moreover, under the constraints of a certain number and occupied space volume, compared with throttle valves connected in parallel, there is no need to assemble air pipe joints, or the number of air pipe joints can be reduced to half the number of throttle valves. From the perspective of the circuit, if any throttle valve is disconnected, the other throttle valves will stop working. The series adjustment component can be equivalent to a single-loop adjustment system. Compared with the throttle valves connected in parallel, the number of loop settings can be reduced, and the volume of the device can be reduced. On this basis, after the series 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 pressure gauge is within the preset airflow sensitivity range, the airflow sensor is determined to be qualified; otherwise, the airflow sensor is determined to be unqualified. Therefore, it is only necessary to pay attention to the minimum negative air pressure value for the start-up of the airflow sensor, and a single-loop adjustment system can be used to verify the sensitivity of the airflow sensor.

[0032] As an example, Figure 1 As shown, the airflow sensor testing device also includes a one-way valve 102, which is disposed between the air pump 101 and the series regulating assembly. The air inlet end of the air pump 101 is connected to the main airflow channel 100 via 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, namely, only allowing air to flow from the main airflow channel 100 into the air pump 101 in the direction of the arrow shown in the figure. If 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 series regulating assembly to prevent airflow from the air pump 101 toward the airflow sensor 109. This prevents airflow from flowing toward the battery assembly of the airflow sensor 109, thereby preventing damage to the airflow sensor (causing a short circuit in the airflow sensor, etc.), preventing the sensor chip from erroneously controlling the flow, and preventing the accuracy of the measurement results of the digital barometer. It also protects the airflow sensor. 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 109, 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 109.

[0033] In this embodiment, if Figure 1As shown, the airflow sensor testing device also includes two first air pipe joints, corresponding to Figure 1 The first air pipe connector 103 and the second air pipe connector 104 are both three-way air pipe connectors, meaning that the vent holes of each air pipe connector can be distinguished as an air inlet and an air outlet based on the direction of gas flow. In this embodiment, both the first air pipe connector 103 and the second air pipe connector 104 are three-way air pipe connectors to reduce the number of connected pipes and simplify the pipe layout. However, air pipe connectors with too many through holes should not be selected to prevent the connection of too many throttle valves, which would cause the pipe layout to occupy a large space. The one-way valve 102 and the series regulating assembly are connected to one end of the main air flow channel 100 (which can be considered as the air outlet end) via a 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, and the other air outlet end of the first air pipe joint 103 is connected to the series regulating assembly. 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 considered as the air outlet end). The digital pressure gauge 110 and the microphone 109 are connected to the other end of the main air flow channel 100 (which can be considered as the air inlet end) via the first air pipe joint 104. Specifically, the first air pipe joint 104 is provided with two air inlet ends and one air outlet end. The two air inlet ends of the first air pipe joint 104 are respectively connected to the digital pressure gauge 110 and the microphone 109, and the air outlet end of the first air pipe joint 104 is connected to the other end of the main air flow channel 100 (which can be considered as the air inlet end). Thus, the main air flow channel 100 connects the equipment for generating the air source, regulating the air source, measuring the air pressure, and preventing the one-way flow through the two first air pipe joints, so that the series adjustment component, the air flow sensor 111 and the main air flow channel 100 are connected (even connected to the outside air), and the air pressure value in the main air flow channel 100 is detected by the digital pressure meter 110 after being adjusted by the series adjustment component.

[0034] In this embodiment, the series regulating assembly includes a first preset number of throttle valves, and the manner in which all the throttle valves in the series regulating assembly are arranged in a serially connected manner on the main air flow channel includes: among the first preset number of throttle valves, there is a first-stage throttle valve connected to one of the first air pipe joints, a final-stage throttle valve connected to the external air, and the remaining throttle valves, and the remaining throttle valves are connected in series to the first-stage throttle valve and the final-stage throttle valve, corresponding to Figure 1 In the embodiment, the first throttle valve is throttle valve 105, the last throttle valve is throttle valve 108, and the remaining throttle valves are throttle valve 106 and throttle valve 107 in sequence, so as to control the gas flow through the first preset number of throttle valves. The first preset number is Figure 1It is represented as the value 4.

[0035] Among the first preset number of throttle valves, the air outlet of the first-stage throttle valve is connected to a vent hole in one of the first air pipe joints that is not connected to the one-way valve 102 and the main air flow channel 100, and the air inlet of the first-stage throttle valve is connected to the air outlet of the adjacent throttle valve, and the air inlet of the first-stage throttle valve is connected to the air outlet of the adjacent throttle valve; the air inlet of the final-stage throttle valve is connected to the external air, and the air outlet of the final-stage throttle valve is connected to the air inlet of the adjacent throttle valve; between the first-stage throttle valve and the final-stage throttle valve, in the flow direction of gas flowing into the main air flow channel, the air inlet of each throttle valve is connected to the air outlet of the adjacent subsequent throttle valve, or the air outlet of each throttle valve is connected to the air outlet of the adjacent previous throttle valve. Corresponding to Figure 1 In the embodiment, the air inlet of the first-stage throttle valve 105 is connected to the air outlet of the adjacent throttle valve 106; the air inlet of the final-stage throttle valve 108 is connected to the external air, and the air outlet of the final-stage throttle valve 108 is connected to the adjacent throttle valve 107. Then the throttle valve 106 and the throttle valve 107 are two adjacent throttle valves in the series adjustment component. The aforementioned adjacency is equivalent to a series connection or a cascade connection in the air flow path. The air outlet of each throttle valve can be connected to the air inlet of the adjacent throttle valve through a pipe (such as an air hose) to form an air flow path with adjustable air pressure; when the air intake of the throttle valve 105, the throttle valve 106, the throttle valve 107, and the throttle valve 108 are adjusted in turn, the air pressure values ​​of more gears can be gradually adjusted in the main air flow channel 100, corresponding to the air flow adjusted by each throttle valve being merged into the main air flow channel 100. The other air inlet of the first air pipe joint 103 is connected to the one-way valve 102 (which can be connected through an air pipe). Therefore, each throttle valve is combined with an air pipe and a few air pipe joint components to form a series regulating delivery pipeline.

[0036] Each throttle valve supports manual adjustment; each throttle valve is connected to a throttle valve in series via a separate connecting pipe (e.g., an air hose). Effective adjustment of the air pressure in the same main airflow channel 100 requires that all throttle valves be opened simultaneously and external air introduced. The series adjustment assembly connects the air paths of each throttle valve in series, then connects them to the same main airflow channel 100 via a first air pipe connector 103. Using fewer air pipe connectors, the intake air volume adjustment results of each series-connected throttle valve are first fed back to the series branch and then back to the main airflow channel 100. This is equivalent to adjusting the series resistance in a series circuit with an adjustable resistor, causing a change in current. This reduces the number of components and the space occupied.

[0037] In addition, since this embodiment uses a trachea 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 sensor testing device, making the airflow sensor testing device a detachable gas testing structure. The airflow sensor testing device can also be set as multiple detachable equipment units, which is not only convenient for adjusting the current inhalation airflow in the main airflow channel 100, but also convenient for disassembly and assembly.

[0038] In some embodiments, the throttle valve ( Figure 1 Any of the throttle valves 105 to 108 shown is used to adjust the intake volume by varying the area of ​​its air inlet obscured. This adjusts the airflow volume provided by the air pump 101 in the main airflow channel 100, 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, simulating the needs of different smoking groups (i.e., the air pressure required to simulate human inhalation), and adjusting the air pressure required to activate different airflow sensors.

[0039] 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, the rotating bottom cover is provided with an air inlet hole that matches 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. The rotating cover can be provided with a plurality of circumferentially distributed fasteners that match the corresponding air regulating ports, the fasteners are clamped on the corresponding air regulating ports, and the fasteners can slide along the corresponding air regulating ports as the rotating cover rotates, thereby adjusting the area of ​​the air inlet covered. Furthermore, a throttle valve is incorporated into an electronic cigarette, and the inhalation flow generated by the air pump 101 simulates a user inhaling at the mouthpiece. When the negative pressure generated by the inhalation reaches the minimum negative pressure (the pressure required for activation), the digital barometer 110 indicates that the switch is turned on, connecting the circuit between the atomizer mechanism and the power supply. The heating component of the atomizer mechanism generates heat, heating the organic cotton containing the tobacco oil, atomizing it into inhalable smoke. The smoke, accompanied by the user's inhalation flow, flows through the atomizer mechanism's atomizer tube 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.

[0040] 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 value of the first preset number is negatively correlated with the air pressure adjustment step of the series adjustment component in the main air flow channel 100. The larger the first preset number, the smaller the air pressure adjustment step and the higher the series adjustment 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 4 to set the air pressure adjustment accuracy to the air pressure unit Pascal.

[0041] Preferably, there is an air inlet of a throttle valve connected to the external gas environment (i.e., external air), so that when the vacuum pump stops working and each throttle valve is opened, the gas in the external gas environment flows into the flow sensor testing device through the throttle valve and the airflow sensor, so that the air pressure value in the main airflow channel becomes equal to the standard atmospheric pressure value, thereby achieving internal and external air pressure balance of the main airflow channel 100.

[0042] On the basis of the above embodiment, the digital barometer 110 is an air flow meter 110, and the air flow sensor 109 is a microphone 109; Figure 1As can be seen, the first air pipe connector 104 used to connect the digital barometer 110 and the microphone 109 is provided with a first vent hole, a second vent hole, and a third vent hole. The first air pipe connector 104 is a three-way air pipe connector. The first vent hole of the first air pipe connector 104 is connected to the detection end of the air flow meter 110 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 110 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 110 (because the air flow is converted into a voltage value through analog-to-digital conversion). The detection end of the air flow meter 110 can be set at the air inlet of the air flow meter 110, or it can be set 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 109. Based on the aforementioned related embodiments, it can be known that the variable capacitor included in the microphone 109 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 inhaled 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 inhaled 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 inhaled airflow in the main airflow channel 100, so that the change in the capacitance value of the variable capacitor reflects the main airflow. When the air pressure in channel 100 changes, the change in capacitance of airflow sensor 109, when simulating human inhalation, indicates the airflow intensity generated by the user's inhalation. When the capacitance of the variable capacitor changes from its initial capacitance under the regulation of the throttle valve (adjusting the air intake volume) and exceeds a preset atomization trigger threshold, airflow sensor 109 activates. In some embodiments, this is represented by the microphone (a type of switch commonly used in electronic cigarettes) being turned on, triggering the electronic cigarette's operation by airflow. At this point, the air pressure in main airflow channel 100 reaches the minimum negative pressure value and can be displayed by airflow meter 110, indicating the sensitivity of airflow sensor 109. The third vent of first air pipe connector 104 is connected to main airflow channel 100. When the three vents of first air pipe connector 104 are interconnected, microphone 109, airflow meter 110, and main airflow channel 100 are connected and can be exposed to external air.Therefore, in the airflow sensor test device disclosed in this embodiment, the one-way valve, series adjustment component, digital pressure gauge and external airflow sensor connected to the vacuum pump 101 are all connected to form an integral detection device using air pipe joints at the connection node of the same main airflow channel 100, which has the effect of step-by-step adjustment of the airflow, so that a smaller number of air pipe joints can be used to connect a larger number of component modules; in this embodiment, two first air pipe joints can be used to connect the one-way valve, series adjustment component and digital pressure gauge, and moreover, there is no need to use air pipe joints to connect the multiple throttle valves in the series adjustment component. After the series adjustment component connects the air paths where each throttle valve is located in series, it is connected to the same main airflow channel through the first air pipe joint. Under the condition of using fewer air pipe joints, the adjustment result of the intake amount of each throttle valve connected in series is first fed back to the series branch, and then fed back to the main airflow channel, thereby reducing the number of components and the occupied space volume.

[0043] As an embodiment, combining Figure 1 As can be seen, the airflow sensor 109 is a microphone, which includes a variable capacitor. After the microphone 109 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 value; 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 value. However, the capacitance does not exceed the maximum capacitance allowed by the microphone 109. Therefore, after the pressure of the inhaled airflow exceeds a certain triggering threshold, it will not have any additional effect on the microphone. The air pressure value existing in the main air flow channel 100 when the microphone 109 starts working, or the air pressure value existing in the microphone 109 when starting working, is the minimum negative air pressure value generated by the main air flow channel 100 when the microphone is in a working state, which is equivalent to the startup 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 inhaled airflow.

[0044] 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. The air pressure generated varies depending on the user's degree of inhalation. 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, thereby changing the distance between the diaphragm and the electrode plate. According to electrostatics, 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 (the distance between the plates). Therefore, as long as the inhalation airflow exceeds the upper or lower limit of the preset airflow sensitivity range, the microphone will activate. After the microphone is activated, if the air pressure of the inhalation airflow is increased by the series adjustment component, the capacitance value of the microphone will increase, but will not exceed the maximum capacitance value of the microphone.

[0045] In some embodiments, the capacitance of the variable capacitor increases as the throttle valve regulates the inhaled airflow generated by the air pump 101 until the microphone changes from a static state to a discharged state. When the microphone changes to the discharged state, the microphone starts to operate, and the microphone enters an operating state. The throttle valve regulates the inhaled airflow generated by the air pump 101 by adjusting at least one throttle valve in the series adjustment assembly. Specific methods include: simultaneously adjusting the air intake volume of at least two throttle valves (which may be two adjacent throttle valves or two throttle valves separated by a gap), or sequentially adjusting the air intake volume of at least two throttle valves, or adjusting the air intake volume of only one throttle valve. Each throttle valve is equivalent to an airflow passage that can communicate with the main airflow channel 100. By manually or electrically adjusting the corresponding throttle valve, the air intake volume provided to the main airflow channel 100 by the corresponding airflow branch can be changed. The more throttle valves connected in series in the series adjustment assembly, the smaller the adjustment step size and the higher the adjustment accuracy. The optimal adjustment accuracy can be on the order of 1 Pa or less. After the microphone 109 is activated, the air pressure value measured by the digital barometer 110 is greater than a preset air pressure activation threshold. Since the air pressure value present when the microphone is activated is the minimum negative air pressure value generated by the main air flow channel 100 when the microphone 109 is in an operating state, in order to ensure that the airflow sensor enters a stable operating state, the preset air pressure activation threshold is set to the upper limit of the preset airflow sensitivity range in this embodiment. When the preset airflow sensitivity range is set to -200 Pa to -150 Pa, the upper limit of the preset airflow sensitivity range is -150 Pa.

[0046] In some embodiments, within the airflow sensor 109, 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, causing the control chip within the airflow sensor to sense a signal of increased external capacitance. When the magnitude of the increase in external capacitance exceeds a preset atomization trigger threshold, the control chip within the airflow sensor enters a discharge state, triggering the airflow sensor to start operating, suitable for inhalation. Furthermore, in this embodiment, the control chip can utilize various existing microcontrollers, allowing for testing the sensitivity of various airflow sensors.

[0047] Based on the air flow sensor test device with adjustable air pressure disclosed in the aforementioned embodiment, the present application also discloses a test method for an air flow sensor. The basic concept of the test method is based on the adjustment of the suction airflow generated by the vacuum pump by the aforementioned air flow sensor test device, so the test method is configured to operate the air flow sensor test device; the execution subject of the test method can be a microcontroller electrically connected to the air flow sensor test device, which can automatically control the air flow sensor test device to test the sensitivity of the external air flow sensor, and can be coordinated by manual adjustment when necessary, but it needs to be executed on the basis that all throttle valves are open, and the air intake of the external air and the internal air source can be adjusted, thereby adjusting the air pressure value of each pipeline.

[0048] Combine Figure 1 and Figure 2 It can be seen that the testing method includes:

[0049] Step S201, start the air pump 101, and then adjust at least one throttle valve, that is, adjust at least one throttle valve in the series adjustment component, until the air pressure value displayed by the digital pressure gauge 110 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, which can be understood as completing the initialization setting of the airflow test environment; then execute step S202.

[0050] Step S202: After the airflow sensor testing device is connected to the airflow sensor 109, power is supplied to the airflow sensor 109 and the air extraction pump 101 is turned on. At this point, the airflow sensor 109 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 impacting the airflow sensor 109 in one direction. Then, step S203 is executed.

[0051] Step S203: Adjust at least one throttle valve until the airflow sensor 109 starts working, then set the air pressure value displayed by the digital barometer 110 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 109 in the working state; then execute step S204.

[0052] During step S203, the pressure of the inhaled airflow in the main airflow channel changes, and the distance between the diaphragm and the electrode plate is negatively correlated with the pressure of the inhaled airflow in the main airflow channel. 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 inhaled 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, changes in the capacitance of the microphone sensor are detected to reflect changes in the pressure of the inhaled airflow, and this can be monitored using the visual output of the digital barometer. When testing the microphone sensor installed in 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. After the microphone sensor is activated, if the pressure of the inhaled airflow increases, the capacitance of the microphone sensor will increase, but will not exceed the maximum capacitance allowed by the microphone sensor.

[0053] 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 .

[0054] 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.

[0055] 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 109 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 109 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 109 starts to work, or the air pressure value existing in the microphone 109 when it starts to work, is the minimum negative air pressure value generated by 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. The minimum negative air pressure value is used to indicate the sensitivity of the airflow sensor.

[0056] For step S203, the method of adjusting at least one throttle valve includes: after each throttle valve of the series regulating assembly is opened, introducing external air into the main air flow channel, and ensuring that each throttle valve of the series regulating assembly is connected to each other and each throttle valve is connected to the first air pipe joint; corresponding to Figure 1 In order to adjust the airflow in the main airflow channel 100, it is necessary to first open the throttle valve 105, the throttle valve 106, the throttle valve 107 and the throttle valve 108, and then introduce the air connected to the air inlet of the throttle valve 108. Then, a throttle valve to be adjusted is selected from the throttle valves included in the series adjustment component; then, among all the throttle valves connected between the throttle valve to be adjusted and the first air pipe joint, if at least one throttle valve is adjusted, the change in the intake amount of the throttle valve to be adjusted is fed back to the main air flow channel, that is, the intake amount of the currently adjusted throttle valve changes, resulting in a change in the air pressure value of the main air flow channel, and then the intake amount of the next adjusted throttle valve changes, resulting in a continued change in the air pressure value of the main air flow channel. Of course, the currently adjusted throttle valve and the next adjusted throttle valve here can be two different throttle valves. In some embodiments, all the throttle valves connected between the throttle valve to be adjusted and the first air pipe joint can also include the throttle valve to be adjusted; it can be achieved from the throttle valve connected to the first air pipe joint (for example Figure 1 throttle valve 105), and then adjust the throttle valves connected in series to the throttle valve to be adjusted (for example Figure 1 By sequentially adjusting throttle valves 105 through 108 in the series control assembly, the air pressure in the main airflow channel 100 is gradually adjusted. Each adjustment of a throttle valve corresponds to a different air pressure value within the main airflow channel, and corresponds to a step-by-step adjustment of the air pressure within the main airflow channel. Therefore, compared to repeatedly adjusting the same throttle valve, sequentially adjusting the series-connected throttle valves in the series control assembly can reduce the adjustment step size, thereby improving adjustment accuracy and, in turn, enhancing the accuracy of testing the sensitivity of the airflow sensor.

[0057] Among them, there is at least one throttle valve connected in series between the throttle valve to be adjusted and the first air pipe joint, or the throttle valve to be adjusted is connected to the first air pipe joint to be recorded as one throttle valve among all the throttle valves connected between the throttle valve to be adjusted and the first air pipe joint, or there is 0 throttle valve connected between the throttle valve to be adjusted and the first air pipe joint. Accordingly, when the throttle valve to be adjusted is Figure 1In the case of the throttle valve 107 shown, all throttle valves connected between the throttle valve to be adjusted and the first air pipe joint include the throttle valve 105 and the throttle valve 106, or are recorded as including the throttle valve 105, the throttle valve 106, and the throttle valve 107. In some embodiments, among all the throttle valves connected to the first air pipe joint, there is a throttle valve connected to the external air, and all the throttle valves connected to the first air pipe joint include the throttle valve to be adjusted. Then, all the throttle valves connected between the throttle valve to be adjusted and the first air pipe joint are connected to each other, and the throttle valve to be adjusted is connected to the external air, that is, all the throttle valves connected between the throttle valve to be adjusted and the first air pipe joint are opened. The throttle valve to be adjusted can be regarded as the last throttle valve in series in the series adjustment assembly.

[0058] It should be noted that the airflow sensor test device includes two first air pipe joints, corresponding to Figure 1 the first air pipe joint 103 and the first air pipe joint 104; the one-way valve 102 and the series adjustment component are connected to one end of the main air flow channel 100 through the first air pipe joint 103, and the digital pressure gauge 110 and the air flow sensor 109 are connected to the other end of the main air flow channel 100 through the first air pipe joint 104.

[0059] Therefore, after all the throttle valves connected to the first air pipe joint are opened, external air can be introduced into the main air flow channel, thereby effectively calling the relevant throttle valves in the series adjustment component to adjust the air pressure; specifically, after each throttle valve in the series adjustment component is opened, external air is introduced into the main air flow channel, thereby forming the necessary conditions for calling all the throttle valves in the series adjustment component to adjust the air pressure of the main air flow channel. Among all the throttle valves connected to the first air pipe joint, if at least one throttle valve is adjusted, the changes in the intake volume of all the adjusted throttle valves will be fed back to the main air flow channel, which is equivalent to adjusting the air pressure in the series branch where the throttle valve is located, and each adjustment of a throttle valve corresponds to generating an air pressure value, which corresponds to each step of adjustment of the air pressure in the main air flow channel; so that starting from the throttle valve connected to the first air pipe joint, in the process of adjusting each throttle valve connected in series to the throttle valve to be adjusted, the air pressure value of the main air flow channel can be gradually adjusted, or starting from the throttle valve connected to the external air, in the process of adjusting each throttle valve connected in series to the throttle valve to be adjusted, the air pressure value of the main air flow channel can also be gradually adjusted.

[0060] From another perspective, after each throttle valve of the series regulating assembly is opened, the air intake of at least two throttle valves can be adjusted, or the air intake of at least two throttle valves can be adjusted in sequence, or the air intake of only one of the throttle valves can be adjusted; the adjustment here can be that the microcontroller sends an electrical signal to control the air flow of each throttle valve, for example, the microcontroller is connected to the adjustable end of the throttle valve through a switching circuit, and then performs high and low level pulse width adjustment by sending a PWM signal, thereby changing the size of the area of ​​the throttle valve's air intake that is blocked by the rotating cover. Therefore, the adjustment program design for each throttle valve is flexible, and it is only necessary to adjust the air intake of each throttle valve in the same branch to make the air pressure value of the main air flow channel fall into the established reference negative air pressure range or trigger the discharge voltage of the variable capacitor included in the air flow sensor to fall into the preset initial working voltage range.

[0061] In some embodiments, for step S203, in the series regulating component, if the throttle valve connected to the external air is closed, the external air is blocked from entering the series regulating component, that is, the series regulating component lacks the gas source provided by the external gas environment. At this time, it can be regarded as the series path where the throttle valve is located is broken. Therefore, in the process of adjusting any throttle valve in the series regulating component, the intake volume of the adjusted throttle valve will not be fed back to the main air flow channel 100, that is, the adjusted intake volume of any throttle valve is invalid, and the intake volume in the series path where the throttle valve is located cannot be adjusted and fed back to the main air flow channel 100, which will also cause the amount of gas entering the main air flow channel 100 to be too large.

[0062] In some embodiments, for step S203, the method of adjusting at least one throttle valve further includes: in the series adjustment component, if the throttle valve connected to the first air pipe joint is closed, the throttle valve connected to the first air pipe joint (corresponding to Figure 1 The throttle valve 105) blocks the passage of any other throttle valve in the series adjustment component to the main air flow channel 100, and at the same time, the air pump 101 cannot provide the throttle valve with an inhaled air flow, and naturally cannot allow the inhaled air flow to be regulated (adjusted by the intake volume) by the throttle valve and transmitted back to the main air flow channel 100; therefore, in the process of adjusting any other throttle valve in the series adjustment component, the intake volume of the adjusted throttle valve cannot be fed back to the main air flow channel 100, and it is determined that the regulation of any other throttle valve in the series adjustment component is invalid, that is, the regulation of any other throttle valve is invalid, and the throttle valve cannot regulate the air pressure value in the main air flow channel 100.

[0063] In summary, for the aforementioned test method, all throttle valves connected to the first air pipe joint introduce external air into the main air flow channel, thereby effectively calling the relevant throttle valves in the series adjustment assembly to adjust the air pressure; specifically, after each throttle valve in the series adjustment assembly is opened, external air is introduced into the main air flow channel, thereby forming the necessary conditions for calling all throttle valves in the series adjustment assembly to adjust the air pressure of the main air flow channel. Among all the throttle valves connected to the first air pipe joint, if at least one throttle valve is adjusted, the changes in the intake volume of all the adjusted throttle valves are fed back to the main air flow channel, which is equivalent to adjusting the air pressure in the series branch where the throttle valve is located, and each adjustment of a throttle valve corresponds to a corresponding air pressure value, which corresponds to each step of the air pressure adjustment in the main air flow channel; so as to realize the gradual adjustment of the air pressure value of the main air flow channel in the process of sequentially adjusting each throttle valve connected in series to the throttle valve to be adjusted.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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. Air flow sensor test device with adjustable air pressure, characterized in that: The air flow sensor test device includes a digital air pressure gauge, an air pump, a main air flow channel and a series adjustment component; The suction pump is used to provide the main air flow channel with an inspiratory air flow; The series regulating assembly and the digital pressure gauge are sequentially arranged on the main air flow channel; The main airflow channel is used to connect to the airflow sensor; the series adjustment assembly includes at least two throttle valves, and all the throttle valves in the series adjustment assembly are arranged in a series-connected manner in the main airflow channel to support gradual adjustment of the inhalation airflow in the main airflow channel; wherein, during the process of adjusting the inhalation airflow, external air enters the series adjustment assembly and all the throttle valves in the series adjustment assembly are open; The digital barometer is used to measure the pressure of the inspiratory airflow in the main airflow channel; Wherein, after the series 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, it is determined that the sensitivity of the air flow sensor is qualified; Wherein, when the type of the airflow sensor changes, the preset airflow sensitivity range required to be used changes; Wherein, the maximum display range of the digital barometer remains to cover the preset airflow sensitivity range; The airflow sensor testing device further includes two first air pipe joints; The air flow sensor testing device further includes a one-way valve, which is arranged between the air pump and the series adjustment component; 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 one-way valve and the series regulating assembly are connected to one end of the main air flow channel via 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 via the other first air pipe joint, so that the series regulating assembly, the air flow sensor and the main air flow channel are connected, and the air pressure value in the main air flow channel is detected by the digital pressure gauge after being regulated by the series regulating assembly. The main air flow channel adopts a ventilation pipe structure, and the air pipe joint is inserted into the main air flow channel to form an air flow passage.

2. The airflow sensor testing device according to claim 1, characterized in that: The series regulating assembly includes a first preset number of throttle valves; The manner in which all the throttle valves in the series regulating assembly are arranged in series on the main air flow channel includes: The first preset number of throttle valves include a first-stage throttle valve connected to one of the first air pipe joints, a final-stage throttle valve communicating with external air, and other throttle valves, wherein the other throttle valves are connected in series to the first-stage throttle valve and the final-stage throttle valve; Among the first preset number of throttle valves, the air outlet of the first-stage throttle valve is 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, and the air inlet of the first-stage throttle valve is connected to the air outlet of the adjacent throttle valve; the air inlet of the final-stage throttle valve is communicated with the outside air, and the air outlet of the final-stage throttle valve is connected to the air inlet of the adjacent throttle valve; Between the first-stage throttle valve and the last-stage throttle valve, in the flow direction of the gas flowing into the main air flow channel, the air inlet of each throttle valve is connected to the air outlet of the adjacent subsequent throttle valve, or the air outlet of each throttle valve is connected to the air outlet of the adjacent previous throttle valve.

3. The airflow sensor testing device according to claim 2, characterized in that: 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; the air pressure adjustment step of the series adjustment component on the main air flow channel is negatively correlated with the numerical value of the first preset number.

4. The airflow sensor testing device according to claim 2, 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.

5. The airflow sensor testing device according to claim 4, characterized in that: 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; 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 a working state, and the minimum negative air pressure value is used to indicate the sensitivity of the air flow sensor.

6. The airflow sensor testing device according to claim 5, 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.

7. A method for testing an airflow sensor, characterized in that: The test method is configured to operate the airflow sensor test device according to any one of claims 1 to 6; The test method includes: Start the vacuum pump, then adjust at least one throttle valve 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 sensor testing device is connected to the airflow sensor, the airflow sensor is powered on and the air pump is turned on; Then, at least one throttle valve is adjusted until the airflow sensor starts working, and then the air pressure value measured by the digital pressure gauge is set as the starting air pressure value and saved; 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.

8. The testing method according to claim 7, 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.

9. The testing method according to claim 7, characterized in that: The method of adjusting at least one throttle valve includes: After each throttle valve of the series regulating assembly is opened, introducing external air into the main air flow passage; If at least one throttle valve among all the throttle valves connected between a throttle valve to be adjusted and the first air pipe joint is adjusted, a change in the intake air volume of the adjusted throttle valve is fed back to the main air flow channel, so that the air pressure value of the main air flow channel is gradually adjusted in the process of sequentially adjusting each throttle valve connected in series to the throttle valve to be adjusted; wherein each adjustment of a throttle valve corresponds to a different air pressure value in the main air flow channel, and corresponds to each step of the air pressure adjustment in the main air flow channel; Wherein, at least one throttle valve is connected in series between the throttle valve to be adjusted and the first air pipe joint, or the throttle valve to be adjusted is connected to the first air pipe joint; In which, the airflow sensor testing device includes two first air pipe joints; the one-way valve and the series adjustment assembly 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 airflow sensor are connected to the other end of the main airflow channel through the other first air pipe joint.

10. The testing method according to claim 9, characterized in that: In the series adjustment component, if the throttle valve connected to the external air is closed, during the process of adjusting any throttle valve in the series adjustment component, the intake volume generated by the adjusted throttle valve cannot be fed back to the main air flow channel, and it is determined that the adjustment of any throttle valve is invalid.

11. The testing method according to claim 7, characterized in that: In the series adjustment component, if the throttle valve connected to the first air pipe joint is closed, the intake volume of the adjusted throttle valve will not be fed back to the main air flow channel during the process of adjusting any other throttle valve in the series adjustment component, and it is determined that the adjustment of any other throttle valve in the series adjustment component is invalid.

Images