CN116807088A

CN116807088A - Airflow detection device and method for airflow sensor test

Info

Publication number: CN116807088A
Application number: CN202211633084.3A
Authority: CN
Inventors: 陈旭生; 钟伟金
Original assignee: Shenzhen Smart Core Technology Co ltd
Current assignee: Shenzhen Smart Core Technology Co ltd
Priority date: 2022-12-19
Filing date: 2022-12-19
Publication date: 2023-09-29

Abstract

The application discloses an air flow detection device and a testing method for testing an air flow sensor, wherein the air flow detection device comprises a digital barometer, an air pump, a main air flow channel and a parallel adjusting component; the air pump is used for generating air suction air flow for the main air flow channel; the parallel adjusting component and the digital barometer are sequentially arranged on the main airflow channel; the main air flow channel is used for connecting an air flow sensor; the parallel regulating assembly comprises at least two throttle valves, and all throttle valves in the parallel regulating assembly are connected in parallel; the digital barometer is used for measuring the air pressure value of the inspiration air flow in the main air flow channel; after the air suction flow in the main air flow channel is regulated to trigger the air flow sensor to start working by the parallel regulation component, if the air pressure value measured by the digital air pressure meter is in a preset air flow sensitivity range, the sensitivity of the air flow sensor is determined to be qualified.

Description

Airflow detection device and method for airflow sensor test

Technical Field

The application relates to the technical field of airflow detection equipment, in particular to an airflow detection device and a testing method for airflow sensor testing.

Background

The electronic cigarette has the function of replacing cigarettes, and because of the unique usability of the electronic cigarette, as long as the air passage is in an open state, air enters, the starting or closing of the microphone is generally controlled by opening or closing the air passage, so that the battery starts to work, and a user only needs to inhale at the cigarette holder to smoke.

Most of electronic cigarettes in the existing market use an air inlet with fixed air inflow, the air inflow cannot be adjusted, or the sensitivity of the electronic cigarettes to user inspiration is detected poorly, and normal smoking experience of users is easily affected.

In addition, the known method for detecting the sensitivity of the airflow sensor of the electronic cigarette comprises the steps of sampling voltage of a microphone (airflow sensor) through a sampling circuit, amplifying the voltage through an amplifying circuit, and finally identifying and processing the voltage through an analog-to-digital conversion microcontroller; or the high-order analog-to-digital conversion microcontroller is directly used for processing without amplification treatment of an amplifying circuit, however, in the current detection schemes, the peripheral circuit of the microcontroller has large scale, more elements are needed, the reliability requirement of layout connection is high, the whole board layout is easy to be complicated, and an air source is not actively provided for simulating the air suction action.

Disclosure of Invention

The application discloses an airflow detection device and a testing method for airflow sensor testing, and the specific technical scheme is as follows:

the air flow detection device for testing the air flow sensor comprises a digital barometer, an air pump, a main air flow channel and a parallel adjusting component; the air pump is used for generating air suction air flow for the main air flow channel; the parallel adjusting component and the digital barometer are sequentially arranged on the main airflow channel; the main air flow channel is used for connecting an air flow sensor; the parallel regulating assembly comprises at least two throttle valves, and all throttle valves in the parallel regulating assembly are arranged on the main air flow channel in a parallel connection mode so as to support the regulation of the inspiration air flow in the main air flow channel to trigger the starting work of the air flow sensor; the digital barometer is used for measuring the air pressure value of the inspiration air flow in the main air flow channel; after the parallel adjusting component adjusts the air suction 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 air pressure meter is in a preset air flow sensitivity range, determining that the sensitivity of the air flow sensor is qualified; when the type of the airflow sensor is changed, the preset airflow sensitivity range required to be used is changed; wherein, the maximum display range of the digital barometer keeps covering a preset airflow sensitivity range.

Further, the airflow detection device also comprises a one-way valve, and the one-way valve is arranged between the air sucking pump and the parallel adjusting component; the air inlet end of the air pump is connected with the main air flow channel through the one-way valve so as to prevent air from flowing out of the air pump in one direction.

Further, the air flow sensor is a microphone; the microphone includes a variable capacitor; after the microphone starts to work, if the air pressure value of the air suction air flow in the main air flow channel is increased, the capacitance value of the variable capacitor is increased, but the capacitance value does not exceed the maximum capacitance value allowed by the microphone; after the microphone starts to work, if the air pressure value of the air suction air flow in the main air flow channel is reduced, the capacitance value of the variable capacitor is reduced; the air pressure value of the main air flow channel when the microphone starts to work or the air pressure value of the microphone when the microphone starts to work 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 for representing the sensitivity of the air flow sensor.

Further, under the regulation action of the throttle valve on the suction air flow generated by the suction pump, the capacitance value of the variable capacitor becomes larger until the microphone is changed from a static state to a discharge state; when the microphone is in a discharge state, the microphone starts to work; after the microphone starts to work, the air pressure value measured by the digital air pressure meter is larger than a preset air pressure starting threshold, wherein the preset air pressure starting threshold is the upper limit value of the preset air flow sensitivity range.

Further, the air flow detection device further comprises two first air pipe joints; the one-way valve and the parallel adjusting component are connected with one end of the main air flow channel through one of the first air pipe connectors, the digital air pressure meter and the microphone are connected with the other end of the main air flow channel through the other first air pipe connector, so that the result that the air pressure value in the main air flow channel passes through the parallel adjusting component is detected through the digital air pressure meter on the premise that the parallel adjusting component, the air flow sensor and the main air flow channel are communicated.

Further, the parallel adjustment assembly includes a first preset number of pairs of throttle valves, and a first preset number of second air line connectors; the second air pipe joint and the first air pipe joint are provided with three vent holes; the manner in which all of the throttles in the parallel regulating assembly are connected in parallel to the main gas flow path includes: each pair of throttle valves is connected with two vent holes of a second air pipe joint, wherein each pair of throttle valves comprises two throttle valves, and one throttle valve is correspondingly connected with one vent hole of the second air pipe joint so as to control the air flow; all the second air pipe joints are connected with one air hole which is not connected with the throttle valve and is not connected with the one check valve and the main air flow channel, and each throttle valve is connected and converged to the main air flow channel; wherein the one-way valve and the main air flow passage are respectively connected to a corresponding one of the ventilation holes of the one of the first air tube joints.

Further, the throttle valve is used to adjust the intake air amount by changing the area of which the intake port is shielded; wherein each throttle valve supports manual adjustment; each throttle valve is connected to the vent hole of the corresponding second air pipe joint through a pipeline which is respectively communicated, and the vent holes which are not connected with the throttle valves in all the second air pipe joints are connected with one vent hole which is not connected with the one-way valve and the main air flow channel in one first air pipe joint through the same air outlet pipeline; the parallel adjusting assembly is in negative correlation with the value of the first preset number of the circulating air pressure adjusting step length.

Further, the digital barometer is an air flow meter, and the air flow sensor is a microphone; the first air pipe joint used for connecting the digital air pressure gauge and the microphone is provided with a first air hole, a second air hole and a third air hole; the first vent hole of the first air pipe joint is connected with the detection end of the air flowmeter so as to expose the detection end to the suction air flow existing in the main air flow channel; the air flow meter is used for sensing the air flow in the main air flow channel, converting the air flow into a digital signal and configuring the digital signal into 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 rate through the air flow meter; the second ventilation hole of the first air pipe joint is connected with the microphone, the microphone comprises a variable capacitor which is formed by arranging a vibrating diaphragm and an electrode plate relatively, the distance between the vibrating diaphragm and the electrode plate is in negative correlation with the air pressure value of the air suction flow in the main air flow channel, the distance between the vibrating diaphragm and the electrode plate is in inverse correlation with the capacitance value of the variable capacitor, so that the capacitance value of the variable capacitor is increased along with the increase of the air pressure value of the air suction flow in the main air flow channel, and the capacitance value of the variable capacitor is reduced along with the decrease of the air pressure value of the air suction flow in the main air flow channel; wherein the third vent of the first air pipe joint is connected with the main air flow channel; when the three vent holes of the first air pipe joint are communicated with each other, the microphone, the air flow meter and the main air flow channel are communicated.

A method of testing an air flow sensor, the method configured to test the sensitivity of the air flow sensor to which the air flow detection device is connected; the test method comprises the following steps: starting an air pump, and then adjusting a throttle valve in the parallel adjusting assembly until the air pressure displayed by the digital air pressure gauge is in a reference negative air pressure range; then closing the air extracting pump; after the airflow detection device is connected with the airflow sensor, powering on the airflow sensor, and starting an air pump; then adjusting a throttle valve in the parallel adjusting assembly until the air flow sensor starts working, and setting the air pressure value measured by the digital air pressure meter as a starting air pressure value and storing the starting air pressure value; then judging whether the stored starting air pressure value falls into a preset air flow sensitivity range, if so, determining that the sensitivity of the air flow sensor is qualified, otherwise, determining that the sensitivity of the air flow sensor is unqualified; wherein the starting air pressure value is used for representing the sensitivity of the air flow sensor.

Further, after the air flow sensor is electrified, in the process of adjusting the air suction flow in the main air flow channel by the throttle valve, if the variable capacitor included in the air flow sensor starts to discharge outwards and the discharge voltage of the variable capacitor is in a preset initial working voltage range, the air flow sensor is confirmed to start working.

Further, adjusting the throttle valve among the parallel adjustment assemblies includes: simultaneously adjusting the air inflow of at least two throttle valves, or sequentially adjusting the air inflow of at least two throttle valves; in the process of adjusting the throttle valve in the parallel adjustment assembly, the air pressure of the air suction flow in the main air flow channel is changed, the distance between the vibrating diaphragm and the electrode plate is in negative correlation with the air pressure value of the air suction flow in the main air flow channel, and the distance between the vibrating diaphragm and the electrode plate is in negative correlation with the capacitance value of the variable capacitor, so that the capacitance value of the variable capacitor is in positive correlation with the air pressure value of the air suction flow in the main air flow channel; the airflow sensor is a microphone sensor, and the microphone sensor comprises a variable capacitor which is formed by arranging a vibrating diaphragm and an electrode plate relatively.

Further, the reference negative air pressure ranges include air pressure values that are all negative air pressure values and are all configured to simulate air pressure values required for the inhalation of the human body.

Compared with the prior art, the application sets the air pump as an air pumping source to generate air suction flow in the main air flow channel, uses a plurality of throttle valves connected in parallel to adjust the air inflow to change the air pressure in the main air flow channel, and finely adjusts the air pressure value of the air suction flow, under the constraint of a certain quantity and occupied space volume, along with the increase of the quantity of the throttle valves connected in parallel, the adjusting precision is higher, and can be accurate to 1pa unit. On the basis, after the parallel adjusting component adjusts the air suction 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 air pressure meter is in the preset air flow sensitivity range, determining that the air flow sensor is qualified, otherwise, determining that the air flow sensor is unqualified, and testing the external air flow sensor is realized.

In the air flow detection device disclosed by the application, the check valve connected with the air pump, the throttle valve in the parallel regulating assembly, the digital air pressure meter and the external air flow sensor are all connected into the whole detection device by using the air pipe joint at the connecting joint in the same main air flow channel, so that the effect of adjustable air flow is achieved, and particularly, a relatively large number of element modules can be connected by using a relatively small number of air pipe joints.

Because the check valve, the digital barometer and the throttle valve are connected by using the air pipe connector, the check valve, the digital barometer and the throttle valve are all detachably assembled in the air flow detection device, so that the air flow detection device becomes a detachable air test structure, and the air flow detection device can be arranged into a plurality of detachable equipment units, thereby being convenient to transport, store or support independent adjustment.

In summary, the air flow detection device disclosed by the application is beneficial to building an environment for testing the sensitivity of the air flow sensor, which is low in cost, simple, convenient, safe and high in precision. The throttle valve connected in parallel can be manually adjusted to change the air pressure value actively generated by the air pump into the main air flow channel while ensuring certain adjusting precision, so that the control program design is reduced, and the flexibility and the operability are improved.

In order to test the sensitivity of the air flow sensor, the air pump is started first, then a plurality of throttle valves in the parallel adjusting assembly are adjusted until the air pressure displayed by the digital air pressure meter is in a reference negative air pressure range, and then the air pump is closed, so that the air pressure environment of human body inhalation is simulated in the main air flow channel, namely, the air pressure value required by the inhalation action of the human body is restored before the main air flow channel is formally tested or before the air flow sensor is started. Then starting the air pump and powering on the air flow sensor, then adjusting a plurality of throttle valves in the parallel adjusting assembly until the air flow sensor starts to work, setting the air pressure value displayed by the digital air pressure meter as the starting air pressure value and recording the starting air pressure value for marking the air pressure value as the sensitivity of the air flow sensor, namely, the air pressure sensitivity of the air flow sensor for sensing the current air suction air flow in the main air flow channel is used as an index for evaluating the detection sensitivity of the air flow sensor or a built-in chip thereof. And judging whether the recorded starting air pressure value falls into a preset air flow sensitivity range, if so, determining that the sensitivity of the air flow sensor is qualified, otherwise, determining that the sensitivity of the air flow sensor is unqualified, and judging whether the air flow sensor meets the current application requirement by means of parallel air flow adjustment under the standard starting air pressure value.

In the process of adjusting the throttle valves in the parallel adjusting assembly, the throttle valves in the parallel adjusting assembly can be adjusted simultaneously or sequentially, so that the air pressure values in various numerical ranges can be adjusted, the method is suitable for sensitivity tests of various air flow sensors, and the accuracy of the tests is improved.

Drawings

Fig. 1 is a schematic structural diagram of an airflow detecting device for airflow sensor testing according to an embodiment of the present application.

FIG. 2 is a flow chart of a testing method of an airflow sensor according to another embodiment of the application.

Detailed Description

The following describes the embodiments of the present application further with reference to the drawings. In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

As one embodiment, an airflow detecting device for airflow sensor testing is disclosed, and as can be seen in fig. 1, the airflow detecting device includes a digital barometer 112, an air pump 101, a main airflow channel 100, and a parallel adjustment assembly; wherein the main gas flow channel 100 may be connected to the outside of the gas flow detecting device, the main gas flow channel 100 may employ a vent pipe structure (e.g., a soft pipe), and an air pipe fitting is inserted into the main gas flow channel 100 to form a gas flow path. The air pump 101 is used for generating an air suction flow for the main air flow channel 100, the air suction flow direction is indicated by a left arrow in fig. 1, and after the air pump 101 is started to work, air sources provided by the air pump 101 for the related ventilation channels/ventilation pipelines in the air flow detection device all flow back to the air pump 101, so that the air pump 101 adopts a micro air pump or a micro motor in order to reduce the volume of an assembly space. Alternatively, the suction pump 101 is connected to the main gas flow passage 100 through a check valve or a throttle valve. The parallel adjustment assembly and the digital barometer 112 are sequentially disposed on the main airflow path 100; the main airflow channel 100 is used for connecting with the airflow sensor 111, and the air suction airflow in the main airflow channel 100 can deform the airflow sensor 111 and convert the deformation into capacitance change to cause charge and discharge phenomena, especially when the air pressure value in the main airflow channel 100 changes after the airflow sensor 111 discharges, the capacitance of the airflow sensor 111 changes to a certain extent, and then the sensitivity test of the airflow sensor is performed based on the change. Since the parallel adjustment assembly may be composed of throttle valves connected in parallel, the air pump 101 is used as the air source of the main air flow channel 100, so in this embodiment, the air pump 101, the throttle valve, the digital air pressure meter 112, and the air flow sensor 111 may be sequentially disposed on the same air flow channel.

In this embodiment, the parallel adjustment assembly includes at least two throttle valves, and all throttle valves in the parallel adjustment assembly are disposed on the main airflow channel 100 in a parallel connection manner, so as to adjust the air intake of the main airflow channel in parallel, and also can gradually adjust the air intake of the main airflow channel according to a given air pressure gear, so that the air intake of the main airflow channel 100 cannot be continuously adjusted due to disconnection of a branch where one throttle valve is located; the air flow sensor is also supported to be adjusted to trigger the air flow sensor to start working, and the air flow is fed back to the digital barometer 112 in time; specifically, two throttle valves are connected to one three-way air pipe joint, two other throttle valves are connected to the other three-way air pipe joint, and then the air outlets of the two three-way air pipe joints are converged and connected into a whole through a pipeline and then communicated to the main air flow channel 100; because the throttle valve supports manual adjustment, the throttle valve that every tee bend air pipe joint is connected all constitutes an adjustable branch road of air current, a plurality of branch roads meet and are connected to main air current passageway 100, thereby carry out atmospheric pressure fine adjustment to main air current passageway 100, can adjust the air flow of breathing in the main air current passageway 100 for triggering the air current sensor 111 and start work, under the regulating action of parallelly connected adjusting part, the air flow of main air current passageway 100 can continuously change, then air current sensor 111 can work with different powers, when air current sensor 111 uses the electron cigarette, reach the effect that utilizes the breathing in to trigger the smoking action, thereby adjust the size of smog volume, then can simulate different crowd's smoking demand. It should be noted that, in life, the vital capacity of each person is different, and the inhalation amount of each person is also different, so that the smoking amount of different people when smoking electronic cigarettes is different, and it is difficult to meet the smoking demands of different clients.

The digital barometer 112 is used to measure the air pressure value of the inspiratory air flow in the main air flow channel 100; specifically, after the digital barometer 112 is connected to the main airflow channel 100, the barometer value in the main airflow channel 100 can be displayed in real time, and the barometer adjustment result of the throttle valve in the parallel adjustment assembly can be fed back in real time, so that a tester can conveniently observe the barometer value in the main airflow channel 100 or the barometer value of the air suction airflow sensed by the airflow sensor 111 in real time, wherein the air suction airflow sensed by the airflow sensor 111 is regarded as the airflow at the air pipe joint 104, and is derived from the barometer value in the main airflow channel 100 which is adjusted in real time by the throttle valve in the parallel adjustment assembly. Compared with the prior art, the method has the advantages that the electric quantity value is not displayed to the outside in real time in the closed loop feedback adjustment process, the visual effect of air flow detection is improved, and particularly, each throttle valve is adjusted manually, so that the operation is convenient.

After the parallel adjustment assembly adjusts the air suction flow in the main air flow channel 100 to trigger the air flow sensor 111 to start working, if the air pressure value measured by the digital air pressure meter 112 is in the preset air flow sensitivity range, determining that the sensitivity of the air flow sensor 111 is qualified; if the air pressure value measured by the digital air pressure meter 112 is within the preset air flow sensitivity range, determining that the sensitivity of the air flow sensor 111 is not qualified; preferably, the preset air flow sensitivity range is set at-200 Pa to-150 Pa, forming a sensitivity test standard of the air flow sensor.

The measuring range of the digital barometer can be set as follows: the maximum display range of the digital barometer keeps covering the 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 possibly formed by the suction air flow in the main air flow channel 100. The preset air flow sensitivity range is kept to be set in the maximum range of the digital barometer; preferably, under the adjustment action of the throttle valve of the parallel adjustment assembly, if the measuring range of the digital barometer is represented by a barometric unit, the digital barometer may be between-300 Pa and-50 Pa, and cover the preset airflow sensitivity range, so as to adapt to the sensitivity test of the airflow sensor, specifically, the minimum negative barometric value generated by the inhalation airflow is displayed when the airflow sensor 111 is in a discharge state, which corresponds to the barometric value triggering the airflow sensor 111 to start working, and the minimum negative barometric value may be defined as the starting barometric value. In addition, when the type of the air flow sensor changes, the preset air flow sensitivity range required to be used changes, namely, the external different air flow sensors (mainly the functional types of chips used for data processing in the air flow sensor) change, and under the adjusting action of the throttle valve of the parallel adjusting assembly, the display range of the digital barometer changes adaptively and covers the preset air flow sensitivity range matched with the air flow sensor to be tested.

Compared with the prior art, the application sets the air pump as an air pumping source to generate air suction flow in the main air flow channel, uses a plurality of throttle valves connected in parallel to adjust the air inflow to change the air pressure in the main air flow channel, and supports to adjust each air pressure so as to finely adjust the air pressure value of the air suction flow in the main air flow channel, and under the constraint of a certain quantity and occupied space volume, the higher the adjusting precision is, the more the throttle valves connected in parallel are, the more the air suction flow can be accurate to 1pa unit. On the basis, after the parallel adjusting component adjusts the air suction 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 air pressure meter is in the preset air flow sensitivity range, determining that the air flow sensor is qualified, otherwise, determining that the air flow sensor is unqualified, and realizing the sensitivity test of the external air flow sensor.

In the above embodiment, as shown in fig. 1, the airflow detecting device further includes a check valve 102, where the check valve 102 is disposed between the suction pump 101 and the parallel adjustment assembly; the air inlet end of the air pump 101 is connected to the main air flow channel 100 through the one-way valve 102, so as to prevent the air from flowing out of the air pump 101 in one direction. The check valve 102 is used for controlling the air flow to be single, that is, only allowing the air flow to flow into the air pump 101 in the direction of the arrow shown in the drawing in the main air flow channel 100, if the air in the air pump 101 flows out due to misconnection, and the air flow sensor may be damaged, so that the check valve 102 is installed in the main air flow channel 100 and located between the air pump 101 and the parallel adjustment assembly, and prevents the air flow from flowing from the air pump 101 toward the air flow sensor 111, so that the air flow can be prevented from flowing toward the battery assembly of the air flow sensor 111 to avoid damaging the air flow sensor (causing short circuit of the air flow sensor, etc.), preventing the sensor chip from performing error control, avoiding affecting the accuracy of the measurement result of the digital air pressure meter, and protecting the air flow sensor.

Since the check valve 102 functions to control the flow direction of the air flow in a single direction, the suction pump 101 can only simulate the human body suction action in the main air flow passage 100, that is, the suction action is performed on the air flow sensor 111, but the suction pump 101 cannot simulate the human body blowing action in the main air flow passage 100, that is, the blowing action is not performed on the air flow sensor 111.

As an example, the air flow sensor 111 is a microphone; the microphone includes a variable capacitor; after the microphone 111 starts to operate, if the air pressure value of the air suction flow in the main air flow channel 100 increases, the capacitance value of the variable capacitor increases, wherein the larger the air pressure value of the air suction flow in the main air flow channel 100 is, the more the capacitance value of the variable capacitor increases relative to the initial capacitance value; the smaller the air pressure value of the suction air flow in the main air flow passage 100, the smaller the capacitance value of the variable capacitor increases with respect to the initial capacitance value; but does not exceed the maximum capacitance allowed by the microphone 111, i.e. the discharge current does not increase when the air pressure of the suction air flow in the main air flow channel 100 increases sufficiently to trigger atomization. Therefore, the air pressure of the suction air flow does not have an additional effect on the microphone after exceeding the trigger threshold. Wherein the air pressure value of the main air flow channel 100 when the microphone 111 starts to work, or the air pressure value of the microphone 111 when the microphone starts to work is the minimum negative air pressure value generated when the main air flow channel 100 is in the working state, which is equivalent to the starting working air pressure value disclosed in the previous embodiment; the minimum negative air pressure value is used to indicate the sensitivity of the air flow sensor, in particular the sensitivity of the air flow sensor to sense inhalation.

It should be noted that, the "microphone" in this embodiment refers to a capacitive microphone, and is merely referred to as "microphone" for simplicity of description. The capacitive microphone may be equivalent to a variable capacitor. The microphone can be realized by using a vibrating diaphragm, a gasket, an electrode plate and the like. The vibrating diaphragm and the electrode plate are oppositely arranged and are respectively used as positive and negative electrodes of the capacitor, for example, the vibrating diaphragm can be used as a positive electrode, the electrode plate can be used as a negative electrode, the gasket is arranged between the vibrating diaphragm and the electrode plate and can be realized by adopting insulating gaskets made of materials such as rubber, plastics, resin and the like, and the gasket can electrically isolate the electrode plate from the vibrating diaphragm when external suction (particularly suction generated by suction air flow) does not exist, so that the stability of the microphone is improved. The vibrating diaphragm can be realized by combining metal and elastic materials (such as rubber, fiber cloth and the like), the vibrating diaphragm and the electrode plate can form a parallel plate capacitor when no external suction force exists, and the vibrating diaphragm is contacted with the electrode plate to be conducted when the external suction force reaches a certain threshold value. According to the difference of inspiration or expiration degrees of a user, the generated air pressure is different, when the user inhales, the vibrating diaphragm in the microphone vibrates under the inspiration action of the user, so that the distance between the vibrating diaphragm and the electrode plate is reduced, namely the distance between the vibrating diaphragm and the electrode plate is changed, and according to electrostatics, when the dielectric constant and the area of the two plates are unchanged, the capacitance value is in direct proportion to the dielectric constant of a medium, in direct proportion to the area of the two electrode plates and in inverse proportion to the distance between the vibrating diaphragm and the electrode plate. Therefore, the microphone can start working as long as the inspiration air flow exceeds the upper limit value or the lower limit value of the preset air flow sensitivity range; after the microphone starts to work, if the air pressure value of the air suction flow is regulated and increased by the parallel regulating assembly, the capacitance value of the microphone can be increased, but the maximum capacitance value of the microphone cannot be exceeded.

In some embodiments, under the regulation action of the throttle valve on the suction air flow generated by the suction pump, the capacitance value of the variable capacitor becomes larger until the microphone changes from a static state to a discharge state; when the microphone is in a discharge state, the microphone starts to work; the microphone enters a working state; the throttle valve adjusts the suction air flow generated by the suction pump 101 by adjusting the throttle valve in the parallel adjusting assembly, and the specific modes include: simultaneously adjusting the air inflow of at least two throttle valves, or sequentially adjusting the air inflow of at least two throttle valves; each throttle valve corresponds to a branch flow branch capable of being communicated with the main air flow channel 100, the air inflow provided by the branch flow branch to the main air flow channel 100 can be changed by manually or electrically adjusting a plurality of throttle valves in sequence, the problem of overlarge air pressure change caused by single adjustment can be reduced relative to the air inflow of only one throttle valve, and the throttle valves connected in parallel in sequence can realize the effect of gradually adjusting air pressure. Therefore, in the process of adjusting the throttle valves in the parallel adjusting assembly, the throttle valves in the parallel adjusting assembly can be adjusted simultaneously or sequentially, the air pressure values in various numerical ranges can be adjusted, the method is suitable for sensitivity tests of various air flow sensors, and the accuracy of the tests is improved.

The more shunt branches connected in parallel in the parallel adjustment assembly, the smaller the step size of adjustment, the higher the adjustment accuracy, which may be of the order of up to 1Pa or less. After the microphone 111 starts working, the air pressure value measured by the digital air pressure meter 112 is greater than a preset air pressure starting threshold, and because the air pressure value existing during the starting working of the microphone is the minimum negative air pressure value generated by the main air flow channel when the microphone is in a working state, in order to stably cross the stage of starting working, the preset air pressure starting threshold is the upper limit value of the preset air flow sensitivity range, and when the preset air flow sensitivity range is set at-200 Pa to-150 Pa, the upper limit value of the preset air flow sensitivity range is-150 Pa.

In some embodiments, within the airflow sensor 111, a variable capacitor may be connected to a pin of a control chip provided within the airflow sensor. Because the capacitance value of the variable capacitor increases due to the change of air pressure, a control chip arranged in the air flow sensor can detect a signal of the increase of the capacitance value of the variable capacitor, and when the increase amplitude of the capacitance value exceeds a preset atomization trigger threshold value, the control chip arranged in the air flow sensor enters a discharge state from a static state, and then the air flow sensor is triggered to start working, so that the air flow sensor is suitable for pumping action. Further, the control chip in this embodiment may employ various existing microcontrollers, and thus the sensitivity of various types of air flow sensors may be tested.

As an embodiment, as shown in fig. 1, the airflow detecting device further includes two first air connectors, corresponding to the first air connector 103 and the first air connector 104 in fig. 1, where the first air connector 103 and the first air connector 104 belong to a three-way air connector. In this embodiment, no matter the first air pipe joint or the second air pipe joint, in order to save the number of connected pipes and simplify the pipe layout mode, three-way air pipe joints are adopted, but air pipe joints with too many through holes cannot be selected, so that too many throttle valves are prevented from being connected to cause the pipe layout to occupy a larger space. The check valve 102 and the parallel adjustment assembly are connected to one end (can be regarded as an air outlet end) of the main air flow channel 100 through 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 check valve 102, the other air outlet end of the first air pipe joint 103 is connected to the parallel adjustment assembly, and the air outlet end of the first air pipe joint 104 is connected to one end (can be regarded as an air outlet end) of the main air flow channel 100. The digital barometer 112 and the microphone 111 are connected to the other end (may be regarded as an air inlet end) of the main air flow channel 100 through a 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 barometer 112 and the microphone 111, and the air outlet end of the first air pipe joint 104 is connected to the other end (may be regarded as an air inlet end) of the main air flow channel 100. The main air flow channel 100 is connected with the device for generating air source, adjusting air source, measuring air pressure and preventing unidirectional flow through the two first air pipe joints, so that the parallel adjusting assembly, the air flow sensor 111 and the main air flow channel 100 are connected, and the result that the air pressure value in the main air flow channel 100 is adjusted by the parallel adjusting assembly is detected through the digital air pressure meter 112.

On the basis of the embodiment, the parallel adjustment assembly comprises a first preset number of pairs of throttle valves and a first preset number of second air pipe connectors; the second air pipe joint and the first air pipe joint are provided with three vent holes, and the vent holes of each air pipe joint can be used for distinguishing an air inlet hole from an air outlet hole according to the air flow direction; the manner in which all of the throttle valves in the parallel adjustment assembly are disposed in parallel connection on the main gas flow path includes: each pair of throttle valves is connected with two vent holes of a second air pipe joint, wherein each pair of throttle valves comprises two throttle valves, and one throttle valve is correspondingly connected with one vent hole of the second air pipe joint so as to control the air flow; all the second air connections (105 and 106) have no vent (air outlet) connected to the throttle valve, and one vent (air inlet for connecting the parallel adjustment assembly) connected to the one-way valve 102 and the main air flow channel 100, among the first air connection connections 103, are connected to each throttle valve connection to the main air flow channel 100; wherein the check valve 102 and the main air flow channel 100 are connected to a corresponding one of the ventilation holes of the first air pipe joint 103, respectively. In some embodiments, the air pipe joint can be realized by adopting a multi-ventilation pipe joint, the opening and closing between two ventilation holes (transmission ends) are regulated, and the connection and interruption between an air source provided by an air pump (or an external air source introduced by a throttle valve) and the main air flow channel are realized, so that the air pressure values of different gears are gradually regulated in the main air flow channel by sequentially regulating a plurality of throttle valves connected in parallel, and the larger air pressure change generated during the regulation by using a single throttle valve is avoided.

In fig. 1, the second air pipe joint 105 and the second air pipe joint 106 are three-way air pipe joints, and the first preset number is 2, so that in the parallel adjustment assembly, the throttle valve 107 and the throttle valve 108 form a pair of throttle valves, the air outlet end of the throttle valve 107 is connected with one air inlet hole of the second air pipe joint 105, the air outlet end of the throttle valve 108 is connected with the other air inlet hole of the second air pipe joint 105, and each air outlet end and the corresponding air inlet hole can be connected through a pipeline (such as an air hose), so as to form two air flow diversion branches; the throttle valve 109 and the throttle valve 110 form a pair of throttle valves, the air outlet end of the throttle valve 109 is connected with one air inlet hole of the second air pipe joint 106, the air outlet end of the throttle valve 110 is connected with the other air inlet hole of the second air pipe joint 106, and each air outlet end and the corresponding air inlet hole can be connected through a pipeline (such as an air hose) to form two air flow diversion branches; the air outlet holes of the second air pipe joint 105 and the second air pipe joint 106 are respectively connected to two air inlet ends of a Y-shaped air pipe, the air outlet ends of the Y-shaped air pipe are connected to one air inlet hole of the first air pipe joint 103, and the air flows regulated by each throttle valve are converged into the main air flow channel 100. The other air inlet of the first air pipe joint 103 is connected with the one-way valve 102 (which can be connected through an air pipe). Therefore, each throttle valve adopts a mode of combining an air pipe and a multi-ventilation pipe joint assembly to form a parallel type adjusting conveying pipeline, so that the current suction air flow of the main air flow channel 100 can be conveniently adjusted, and the installation is convenient.

In addition, the air pipe connector is used for connecting the one-way valve, the digital barometer and the throttle valve, so that the one-way valve, the digital barometer and the throttle valve are all detachably assembled in the air flow detection device, the air flow detection device is in a detachable air test structure, and the air flow detection device can be arranged into a plurality of detachable equipment units, so that the air flow detection device is convenient to transport, store or support independent adjustment.

In some embodiments, the throttle valve (any one of the throttle valves 107 to 110 shown in fig. 1) is used to adjust the intake air amount by changing the area of the air inlet thereof that is covered, so as to achieve the effect of adjusting the intake air amount, and then the air flow provided by the air pump in the main air flow channel is changed, so that the air flow sensor (microphone) operates with different powers, and when the air pump 101 generates the air suction flow, the air pressure value in the main air flow channel 100 is adjusted to a negative air pressure value, so as to simulate the human body air suction action for the air flow sensor 111 (microphone). The electronic cigarette can be used for adjusting the amount of smoke, and can adjust the air pressure required by different airflow sensors when the electronic cigarette is started to work, and particularly simulate the smoking needs of different groups (namely, simulate the air pressure value required by the inhalation action of a human body).

Wherein each throttle valve supports manual adjustment; each throttle valve is connected to the vent hole of the corresponding second air pipe joint through a respectively communicated pipe (such as an air hose), all the vent holes which are not connected with the throttle valves in the second air pipe joints are connected with one vent hole which is not connected with the one-way valve and the main air flow channel in the first air pipe joint through a same air outlet pipe (a Y-shaped air pipe disclosed in the previous embodiment), and the corresponding figure 1 is that the air outlet holes of the second air pipe joint 105 and the second air pipe joint 106 are respectively connected to two air inlet ends of a Y-shaped air pipe, the air outlet ends of the Y-shaped air pipe are connected with one air inlet hole of the first air pipe joint 103, and the air flow regulated by each throttle valve is converged into the main air flow channel 100.

In some embodiments, the throttle valve 107 is adjusted first, and the rest throttle valves are not adjusted temporarily, so that the air pressure value in the main air flow channel 100 can reach the first air pressure gear and be displayed by the panel of the digital air pressure gauge 112, and then the throttle valve 107 is stopped being adjusted; then, the throttle valve 108 is adjusted, and the rest throttle valves are temporarily not adjusted, so that the air pressure value in the main air flow channel 100 can reach a second air pressure gear and is displayed by the panel of the digital air pressure gauge 112, and then the throttle valve 108 is stopped being adjusted; then, the throttle valve 109 is adjusted, and the rest throttle valves are temporarily not adjusted, so that the air pressure value in the main air flow channel 100 can reach a third air pressure gear and is displayed by the panel of the digital air pressure gauge 112, and then the throttle valve 109 is stopped being adjusted; then, the throttle valve 110 is adjusted, and the rest throttle valves are temporarily not adjusted, so that the air pressure value in the main air flow channel 100 can reach the fourth air pressure gear and be displayed by the panel of the digital air pressure gauge 112, and then the throttle valve 110 is stopped being adjusted. Whereby stepwise adjustment of the air pressure value in the main air flow passage 100 by means of sequentially adjusting the intake air amounts of at least two throttle valves is achieved, which is displayed as different air pressure shift information among the digital air pressure gauges 112. If the intake air amounts of two of the throttle valves or the intake air amounts of three of the throttle valves are simultaneously adjusted, for example, only the throttle valves 107 and 110, or the throttle valves 108, 109, and 110 are adjusted, other air pressure shift information may be displayed in the digital air pressure gauge 112, and the combined adjustment manner of the plurality of throttle valves connected in parallel is not particularly limited here, but the adjustment accuracy is higher than that in the case of using a single throttle valve adjustment, and the generation of a larger air pressure variation value per adjustment is avoided. Therefore, in the process of adjusting the throttle valves in the parallel adjusting assembly, the throttle valves in the parallel adjusting assembly can be adjusted simultaneously or sequentially, the air pressure values in various numerical ranges can be adjusted, the method is suitable for sensitivity tests of various air flow sensors, and the accuracy of the tests is improved.

Preferably, a rotary bottom cover is arranged in an assembly base where the throttle valve is located, the upper end of the rotary bottom cover is sleeved in the lower end of the throttle valve and is in rotary connection with the throttle valve, a plurality of circumferentially distributed air regulating ports are arranged on the throttle valve, air inlets matched with the corresponding air regulating ports are arranged on the rotary bottom cover, an air inlet of the throttle valve is an opening of the air inlet, the rotary bottom cover is rotated to regulate the area of the air inlet shielded by the throttle valve, and then the air inflow is regulated, so that the air suction amount of the main air flow channel can be controlled.

The rotary cover can be provided with a plurality of fasteners which are distributed circumferentially and matched with the corresponding air regulating openings, the fasteners are clamped on the corresponding air regulating openings, and the fasteners can slide along the corresponding air regulating openings along with the rotation of the rotary cover, so that the shielded area of the air inlet is regulated. Further, the throttle valve is applied to the electronic cigarette, and the air pump generates air suction air flow to simulate the situation that a user inhales at the cigarette holder, the digital barometer displays that the negative pressure value generated by triggering smoking reaches the minimum negative pressure value (the air pressure value required by starting work), the switch is opened, the atomizing mechanism is communicated with a connecting loop formed by a power supply, the heating component of the atomizing mechanism heats organic cotton containing tobacco tar, so that the organic cotton is atomized into inhalable smoke, and the smoke is discharged from the cigarette holder for the user to suck along with the air suction air flow of the user through the atomizing pipe of the atomizing mechanism. Under the condition of the same air suction amount, the area of the air inlet shielded by the throttle valve can be adjusted by rotating the bottom cover, so that the air inflow is adjusted, the microphone can work with different powers, and the smoke amount is adjusted.

The shape, number and area of the air inlets of the throttle valve are not limited, and those skilled in the art can set the throttle valve according to the implementation. The throttle valve may be a cylindrical structure and each dimension of the throttle valve is about 3 cm in size. The parallel adjustment assembly is in negative correlation with the value of the first preset number, the larger the first preset number is, the smaller the air pressure adjustment step is, the higher the adjustment precision is, but the overall occupied space is limited, the first preset number cannot be infinitely increased, and in fig. 1, the first preset number is set to be a value of 2 so as to set the air pressure adjustment precision to the air pressure unit pascal.

Preferably, the air inlet of each throttle valve is communicated with an external air environment, and is used for enabling air in the external air environment to flow into the air flow detection device from the throttle valve when the air pump stops working, so that the air pressure value in the main air flow channel becomes equal to the standard atmospheric pressure value, and the air pressure balance inside and outside the main air flow channel is realized.

On the basis of the foregoing embodiment, the digital barometer 112 is an air flow meter 112, and the air flow sensor 111 is a microphone 111; as can be seen from fig. 1, the first air pipe joint 104 for connecting the digital air pressure gauge 112 and the microphone 111 is provided with a first air hole, a second air hole and a third air hole, and the first air pipe joint 104 belongs to a three-way air pipe joint. The first vent of the first air pipe joint 104 is connected with the detection end of the air flow meter 112 to expose the detection end to the suction air flow existing in the main air flow passage 100, wherein the first air pipe joint 104 is arranged in communication with the main air flow passage 100; the air flow meter 112 is configured to sense the air flow in the main air flow channel 100, convert the air 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 joint, wherein the voltage value of the digital signal is proportional to the air flow passing through the air flow meter 112 (because the air flow forms the voltage value through analog-to-digital conversion); the detection end of the air flow meter 112 may be disposed at the air inlet of the air flow meter 112, or may exist in the form of a negative electrode. In addition, as can be seen from the foregoing related embodiments, the second ventilation hole of the first air-flow connector 104 is connected to the microphone 111, and the microphone 111 includes a variable capacitor that is relatively configured by a vibrating diaphragm and an electrode plate, where a distance between the vibrating diaphragm and the electrode plate is in an inverse relationship with an air pressure value of the air-intake air flow in the main air-flow channel 100, and a distance between the vibrating diaphragm and the electrode plate is in an inverse relationship with a capacitance value of the variable capacitor, so that the capacitance value of the variable capacitor increases along with an increase in the air pressure value of the air-intake air flow in the main air-flow channel 100, and the capacitance value of the variable capacitor decreases along with a decrease in the air pressure value of the air-intake air flow in the main air-flow channel 100, so that a capacitance value variation of the variable capacitor reflects a variation in the air pressure value in the main air-flow channel 100, and the capacitance value variation of the air-flow sensor 111 characterizes an air flow intensity generated when inhaling an inhalation by a user when simulating a human body; under the adjustment action of the throttle valve (the adjustment action of the intake air amount), when the amount of change of the capacitance value of the variable capacitor with respect to the initial capacitance value exceeds the preset atomization trigger threshold, the air flow sensor 111 starts to operate, and at this time, the air pressure value existing in the main air flow passage 100 is the minimum negative air pressure value and can be displayed by the air flow meter 112, which indicates the sensitivity of the air flow sensor.

A third vent of the first air pipe joint 104 is connected with the main air flow channel 100; when the three ventilation holes of the first air pipe joint 104 are arranged to communicate with each other, the microphone 111, the air flow meter 112 and the main air flow passage 100 communicate with each other. Therefore, in the air flow detection device disclosed in this embodiment, the check valve connected with the air pump, the throttle valve in the parallel adjustment assembly, the digital air pressure meter and the external air flow sensor are all connected into the integral detection device by using the air pipe joint at the connecting node (or the junction) in the same main air flow channel, so as to achieve the effect of adjustable air flow, and in particular, a relatively large number of element modules can be connected by using a relatively small number of air pipe joints.

Based on the air flow detection device for testing the air flow sensor disclosed by the embodiment, the application also discloses a testing method of the air flow sensor, wherein the basic conception of the testing method is based on the adjustment and detection of the suction air flow generated by the suction pump by the air flow detection device, so the testing method is configured to test the sensitivity of the air flow sensor connected with the air flow detection device, an execution main body of the testing method can be a microcontroller electrically connected with the air flow detection device, and the testing method can automatically control the air flow detection device to test the sensitivity of the external air flow sensor and can be manually adjusted to be matched if necessary.

As can be seen in connection with fig. 1 and 2, the test method comprises:

step S201, starting the air pump 101, then adjusting a throttle valve in the parallel adjusting assembly until the air pressure displayed by the digital air pressure meter 112 is in a reference negative air pressure range, so as to simulate the air pressure environment required by human body inhalation action, even smoking action, in the main air flow channel 100, make an initial air pressure environment, and then close the air pump 101, thereby completing the initialization of an air flow test environment; step S202 is then performed.

Step S202, after the airflow detecting device is connected to the airflow sensor 111, the airflow sensor 111 is energized, and the air pump 101 is turned on, at this time, the airflow sensor is not yet started to operate, and after the air sensor is energized, the air pressure acting force exerted by the air suction airflow generated by the air pump 101 in the main airflow channel 100 can be received to generate deformation and be converted into a capacitance value variation; in addition, the check valve 102 is provided to prevent the airflow from unidirectionally striking the airflow sensor 111. Then step S203 is performed.

Step 203, adjusting a throttle valve in the parallel adjustment assembly until the air flow sensor 111 starts working, and setting the air pressure value displayed by the digital air pressure meter 112 as a starting air pressure value and recording the starting air pressure value to form a minimum air pressure value or an initial air pressure value sensed by the air flow sensor 111 in a working state; step S204 is then performed.

Specifically, adjusting the throttle valve among the parallel adjustment assemblies includes: simultaneously adjusting the air inflow of at least two throttle valves, or sequentially adjusting the air inflow of at least two throttle valves; the adjustment can be that the microcontroller sends out an electric signal to control the air flow of the branch circuit 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 the microcontroller sends out a PWM signal to perform high-low level pulse width adjustment, so that the area of the air inlet of the throttle valve, which is shielded by the rotating cover surface, is changed. Therefore, the air pressure values of different gears are gradually regulated by sequentially regulating a plurality of throttle valves connected in parallel or simultaneously regulating a plurality of throttle valves connected in parallel in the main air flow channel, and the larger air pressure change generated when a single throttle valve is used for regulation is avoided. Therefore, in the process of adjusting the throttle valves in the parallel adjusting assembly, the throttle valves in the parallel adjusting assembly can be simultaneously adjusted or sequentially adjusted, the air pressure values in various numerical ranges can be adjusted, the method is suitable for sensitivity tests of various air flow sensors, and the accuracy of the tests is improved; meanwhile, the adjusting program design of each throttle valve is flexible, and the air pressure value of the main air flow channel can fall into a preset reference negative air pressure range or the discharge voltage of a variable capacitor included in the trigger air flow sensor can fall into a preset initial working voltage range by adjusting the air inflow in the shunt branch where each throttle valve is located.

In the process of executing step S203, the air pressure of the air suction flow in the main air flow channel changes, the distance between the diaphragm and the electrode plate has a negative correlation with the air pressure value of the air suction flow in the main air flow channel, and the distance between the diaphragm and the electrode plate has a negative correlation with the capacitance value of the variable capacitor, so that the capacitance value of the variable capacitor has a positive correlation with the air pressure value of the air suction flow in the main air flow channel; the airflow sensor is a microphone sensor, and the microphone sensor comprises a variable capacitor which is formed by arranging a vibrating diaphragm and an electrode plate relatively. Thus, the change of the air pressure value of the inspiration air flow is reflected by detecting the change of the capacitance value of the microphone sensor, and the visualized result of the digital air pressure meter can be used for monitoring.

When the microphone sensor assembled on the electronic cigarette is tested, the microphone sensor can start to work as long as the air pressure value of the air suction air flow exceeds the starting air pressure value (can be used as the minimum air pressure threshold for triggering smoking action), and at the moment, the microphone sensor can trigger a prompt signal of the smoking action so as to facilitate the smoking of a user; after the microphone sensor starts to work, if the air pressure value of the air suction air flow is increased, the capacitance value of the microphone sensor is increased, but the capacitance value does not exceed the maximum capacitance value allowed by the microphone sensor. In some embodiments, after the air pressure value of the inhalation air flow exceeds a preset maximum smoking triggering threshold, the capacitance value of the microphone sensor is not changed continuously if the two electrode plates of the microphone are contacted together, and the maximum smoking triggering threshold is larger than the starting air pressure value.

Step S204, judging whether the recorded starting air pressure value falls within a preset air flow sensitivity range, if yes, executing step S205, otherwise, executing step S206.

Step S205, determining that the sensitivity of the airflow sensor is qualified; step S206, determining that the sensitivity of the airflow sensor is unqualified; wherein the starting air pressure value is used for representing the sensitivity of the air flow sensor.

Preferably, for the foregoing step S202 and step S203, after the airflow sensor is energized in step S202, 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 during the process of adjusting the suction airflow in the main airflow channel 100 by the throttle valve, it is confirmed that the airflow sensor 111 starts to operate, and 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 noted that, the air pressure value of the main air flow channel 100 when the microphone 111 starts to work, or the air pressure value of the microphone 111 when the microphone starts to work is the minimum negative air pressure value generated by the main air flow channel 100 when the microphone is in the working state, which is equivalent to the starting working air pressure value disclosed in the foregoing embodiment; the minimum negative air pressure value is used to represent the sensitivity of the air flow sensor.

Therefore, in order to test the sensitivity of the air flow sensor, the air pump is started, the throttle valve in the parallel adjusting assembly is adjusted until the air pressure displayed by the digital air pressure meter is in the reference negative air pressure range, and then the air pump is closed, so that the air pressure environment of human body inhalation is simulated in the main air flow channel, namely, the air pressure value required by the inhalation action of the human body is restored or the reference air pressure test environment is formed before the main air flow channel is formally tested or before the air flow sensor is started. Then starting the air pump and powering on the air flow sensor, then adjusting the throttle valve in the parallel adjusting component until the air flow sensor starts to work, setting the air pressure value displayed by the digital air pressure meter as the starting air pressure value and recording the starting air pressure value for marking the air pressure value as the sensitivity of the air flow sensor, namely the air pressure sensitivity of the air flow sensor for sensing the current air flow of the air suction in the main air flow channel, and taking the air pressure sensitivity as an index for evaluating the detection sensitivity of the air flow sensor or a built-in chip thereof. And judging whether the recorded starting air pressure value falls into a preset air flow sensitivity range, if so, determining that the sensitivity of the air flow sensor is qualified, otherwise, determining that the sensitivity of the air flow sensor is unqualified, and judging whether the air flow sensor meets the current application requirement by means of parallel air flow adjustment under the standard starting air pressure value.

Preferably, for the reference negative air pressure range disclosed in step S201, the air pressure values included in the reference negative air pressure range are all negative air pressure values and are all configured to simulate air pressure values required for the inhalation action of the human body. The reference negative pressure ranges are set differently according to the different chip types of air flow sensors, for example, -250Pa may be a smoking state in the reference negative pressure range corresponding to one air flow sensor, but may not successfully trigger smoking in the reference negative pressure range corresponding to the other air flow sensor.

Preferably, after the air pump 101 is turned off, the external air flows from the throttle valve into the main air flow channel 100 and other air pipes communicated with the main air flow channel, the air pressure in the air pipes is gradually equal to the standard atmospheric pressure, and the air pressure value in the main air flow channel 100 becomes positive, so that the main air flow channel is not in an air suction state or a smoking state.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms should not be understood as necessarily being directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Further, one skilled in the art can engage and combine the different embodiments or examples described in this specification.

While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims

1. The air flow detection device for testing the air flow sensor is characterized by comprising a digital barometer, an air pump, a main air flow channel and a parallel adjusting component;

The air pump is used for generating air suction air flow for the main air flow channel;

the parallel adjusting component and the digital barometer are sequentially arranged on the main airflow channel;

the main air flow channel is used for connecting an air flow sensor; the parallel regulating assembly comprises at least two throttle valves, and all throttle valves in the parallel regulating assembly are arranged on the main airflow channel in a parallel connection mode;

the digital barometer is used for measuring the air pressure value of the inspiration air flow in the main air flow channel;

after the air suction flow in the main air flow channel is regulated to trigger the air flow sensor to start working by the parallel regulation component, if the air pressure value measured by the digital air pressure meter is in a preset air flow sensitivity range, the sensitivity of the air flow sensor is determined to be qualified.

2. The airflow sensing apparatus of claim 1 further comprising a one-way valve disposed between the suction pump and the parallel adjustment assembly;

the air inlet end of the air pump is connected with the main air flow channel through the one-way valve so as to prevent air from flowing out of the air pump in one direction.

3. The airflow detection apparatus according to claim 1, wherein the airflow sensor is a microphone; the microphone includes a variable capacitor; after the microphone starts to work, if the air pressure value of the air suction air flow in the main air flow channel is increased, the capacitance value of the variable capacitor is increased, but the capacitance value does not exceed the maximum capacitance value allowed by the microphone; after the microphone starts to work, if the air pressure value of the air suction air flow in the main air flow channel is reduced, the capacitance value of the variable capacitor is reduced;

The air pressure value of the main air flow channel when the microphone starts to work or the air pressure value of the microphone when the microphone starts to work 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 for representing the sensitivity of the air flow sensor.

4. A gas flow detecting device according to claim 3, wherein a capacitance value of the variable capacitor becomes large until the microphone is changed from a stationary state to a discharge state by an adjustment of a suction gas flow generated by the suction pump by the throttle valve; when the microphone is in a discharge state, the microphone starts to work;

after the microphone starts to work, the air pressure value measured by the digital air pressure meter is larger than a preset air pressure starting threshold, wherein the preset air pressure starting threshold is the upper limit value of the preset air flow sensitivity range.

5. The airflow detection apparatus according to claim 2, further comprising two first air pipe joints;

the one-way valve and the parallel adjusting component are connected with one end of the main air flow channel through one of the first air pipe connectors, the digital air pressure meter and the microphone are connected with the other end of the main air flow channel through the other first air pipe connector, so that the result that the air pressure value in the main air flow channel passes through the parallel adjusting component is detected through the digital air pressure meter on the premise that the parallel adjusting component, the air flow sensor and the main air flow channel are communicated.

6. The airflow sensing apparatus of claim 5 wherein said parallel adjustment assembly includes a first predetermined number of pairs of throttles and a first predetermined number of second air line connectors; the second air pipe joint and the first air pipe joint are provided with three vent holes;

the manner in which all of the throttle valves in the parallel adjustment assembly are disposed in parallel connection on the main gas flow path includes:

each pair of throttle valves is connected with two vent holes of a second air pipe joint, wherein each pair of throttle valves comprises two throttle valves, and one throttle valve is correspondingly connected with one vent hole of the second air pipe joint so as to control the air flow;

all the second air pipe joints are connected with one air hole which is not connected with the throttle valve and is not connected with the one check valve and the main air flow channel, and each throttle valve is connected and converged to the main air flow channel;

wherein the one-way valve and the main air flow passage are respectively connected to a corresponding one of the ventilation holes of the one of the first air tube joints.

7. The airflow detecting apparatus according to claim 6, wherein the throttle valve is configured to adjust an intake air amount by changing an area of which an intake port is shielded; wherein each throttle valve supports manual adjustment; each throttle valve is connected to the vent hole of the corresponding second air pipe joint through a pipeline which is respectively communicated, and the vent holes which are not connected with the throttle valves in all the second air pipe joints are connected with one vent hole which is not connected with the one-way valve and the main air flow channel in one first air pipe joint through the same air outlet pipeline;

The parallel adjusting assembly is in negative correlation with the value of the first preset number of the circulating air pressure adjusting step length.

8. The airflow detection apparatus according to claim 5, wherein the digital barometer is an air flow meter and the airflow sensor is a microphone;

the first air pipe joint used for connecting the digital air pressure gauge and the microphone is provided with a first air hole, a second air hole and a third air hole;

the first vent hole of the first air pipe joint is connected with the detection end of the air flowmeter so as to expose the detection end to the suction air flow existing in the main air flow channel; the air flow meter is used for sensing the air flow in the main air flow channel, converting the air flow into a digital signal and configuring the digital signal into 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 rate through the air flow meter;

the second ventilation hole of the first air pipe joint is connected with the microphone, the microphone comprises a variable capacitor which is formed by arranging a vibrating diaphragm and an electrode plate relatively, the distance between the vibrating diaphragm and the electrode plate is in negative correlation with the air pressure value of the air suction flow in the main air flow channel, the distance between the vibrating diaphragm and the electrode plate is in inverse correlation with the capacitance value of the variable capacitor, so that the capacitance value of the variable capacitor is increased along with the increase of the air pressure value of the air suction flow in the main air flow channel, and the capacitance value of the variable capacitor is reduced along with the decrease of the air pressure value of the air suction flow in the main air flow channel;

Wherein the third vent of the first air pipe joint is connected with the main air flow channel; when the three vent holes of the first air pipe joint are communicated with each other, the microphone, the air flow meter and the main air flow channel are communicated.

9. A method of testing an air flow sensor, characterized in that the method is configured to test the sensitivity of an air flow sensor to which an air flow detection device according to any one of claims 1 to 8 is connected;

the test method comprises the following steps:

starting an air pump, and then adjusting a throttle valve in the parallel adjusting assembly until the air pressure displayed by the digital air pressure gauge is in a reference negative air pressure range; then closing the air extracting pump;

after the airflow detection device is connected with the airflow sensor, powering on the airflow sensor, and starting an air pump;

then adjusting a throttle valve in the parallel adjusting assembly until the air flow sensor starts working, and setting the air pressure value measured by the digital air pressure meter as a starting air pressure value and storing the starting air pressure value;

then judging whether the stored starting air pressure value falls into a preset air flow sensitivity range, if so, determining that the sensitivity of the air flow sensor is qualified, otherwise, determining that the sensitivity of the air flow sensor is unqualified; wherein the starting air pressure value is used for representing the sensitivity of the air flow sensor.

10. The method according to claim 9, wherein after the air flow sensor is energized, during the adjustment of the suction air flow in the main air flow passage by the throttle valve, if the air flow sensor includes a variable capacitor that starts discharging to the outside and the discharge voltage thereof is within a preset initial operation voltage range, the air flow sensor is confirmed to start operating.

11. The method of testing of claim 9, wherein adjusting the throttle valve in the parallel adjustment assembly comprises: simultaneously adjusting the air inflow of at least two throttle valves, or sequentially adjusting the air inflow of at least two throttle valves;

in the process of adjusting the throttle valve in the parallel adjustment assembly, the air pressure of the air suction flow in the main air flow channel is changed, the distance between the vibrating diaphragm and the electrode plate is in negative correlation with the air pressure value of the air suction flow in the main air flow channel, and the distance between the vibrating diaphragm and the electrode plate is in negative correlation with the capacitance value of the variable capacitor, so that the capacitance value of the variable capacitor is in positive correlation with the air pressure value of the air suction flow in the main air flow channel; the airflow sensor is a microphone sensor, and the microphone sensor comprises a variable capacitor which is formed by arranging a vibrating diaphragm and an electrode plate relatively.

12. The test method of claim 9, wherein the reference negative air pressure ranges include air pressure values that are all negative air pressure values and are all configured to simulate air pressure values required for an inhalation by a human body.