CN214179145U - Airflow sensor - Google Patents
Airflow sensor Download PDFInfo
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- CN214179145U CN214179145U CN202023098380.7U CN202023098380U CN214179145U CN 214179145 U CN214179145 U CN 214179145U CN 202023098380 U CN202023098380 U CN 202023098380U CN 214179145 U CN214179145 U CN 214179145U
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Abstract
The utility model discloses an airflow sensor, which comprises an airflow sensor body, wherein the airflow sensor body is provided with an airflow hole and an air inlet hole, the airflow hole is provided with an air outlet hole protective film, and the air outlet hole protective film covers the airflow hole; an air inlet hole protective film is arranged on the air inlet hole, the air inlet hole protective film covers the air inlet hole, and the air outlet hole protective film and the air inlet hole protective film are protective films subjected to oleophobic and hydrophobic treatment; compared with the prior art, the utility model, liquid such as water and tobacco tar can not remain on the protecting film or peripheral region, can not obstruct the normal business turn over of air current, can use under harsh environment, if soak 192 hours back in the tobacco tar, the air current sensor still can normally work, the utility model discloses process flow is simple, can carry out spraying or soaking operation on the production water line, and the stoving time is short or direct room temperature dries.
Description
Technical Field
The utility model belongs to the sensor field, specific theory relates to an air current sensor.
Background
The airflow sensor is widely applied to devices such as electronic cigarettes and medical atomization, in the working process, substances such as dust, water and oil in the environment where the airflow sensor is located can easily enter the interior of the airflow sensor and are attached to the vibrating diaphragm or the PCB, the normal working environment of the airflow sensor is changed, the performance of the airflow sensor is reduced, and failure and abnormal work can be caused seriously.
As shown in fig. 1, 2 and 3, there are two types of conventional airflow sensors: the airflow sensor comprises an airflow sensor body 1, wherein the airflow sensor body 1 is a hollow cylindrical barrel, an airflow hole 2 is formed in the top of the airflow sensor body 1, and an air inlet 3 is formed in the bottom of the airflow sensor body 1.
The other type of airflow sensor has basically the same structure as the airflow sensor, except that the air inlet 3 is arranged on the side surface of the sensor body 1, and the structure of the airflow sensor has various forms and is approximately similar to the structure of the airflow sensor.
Use the electron cigarette of above-mentioned airflow sensor as the example, the electron cigarette can form the tobacco tar that condensation tobacco tar and cartridge revealed in the course of the work, and inside the tobacco tar flowed into the airflow sensor through the electron flue gas flue, attached to vibrating diaphragm or PCB, made its unable normal work, lead to its failure, greatly reduced the life of electron cigarette.
In order to solve the above technical problems, generally, a person skilled in the art sets a layer of dust screen 13 on the air inlet 3 and the air flow hole 2 of the airflow sensor, however, the improvement effect is limited, and still has a problem that as shown in fig. 4 and 5, liquid residue 12 such as water and smoke oil is attached to the dust screen 13, which results in partially or completely blocking the air holes of the dust screen, and the airflow cannot pass through the airflow sensor or only a small amount of airflow passes through the airflow sensor, which results in abnormal operation; then, the liquid 12 such as water and smoke oil will enter the air flow sensor from the side of the air inlet 3 and the air flow hole 2.
At present, a more efficient solution is not found to solve the problem that substances such as dust, water and oil flow into the air flow sensor through an air passage.
Disclosure of Invention
The to-be-solved problem of the utility model is not enough to above-mentioned technical problem, provides an air current sensor, can effectively protect air current sensor, thoroughly solves the inside problem of air current sensor that material such as water, oil get into, does not influence the circulation of gas simultaneously.
For solving the above problem, the utility model discloses a technical scheme as follows: an airflow sensor comprises an airflow sensor body, wherein an airflow hole and an air inlet hole are formed in the airflow sensor body, an air outlet hole protective film is arranged on the airflow hole, and the air outlet hole protective film covers the airflow hole;
an air inlet protective film is arranged on the air inlet and covers the air inlet.
Further, the air inlet is arranged at the bottom of the airflow sensor body.
Further, the air inlet is arranged on the side face of the airflow sensor body.
Further, the air outlet protective film and the air inlet protective film are protective films subjected to oleophobic and hydrophobic treatment.
Furthermore, the protective film comprises two protective films, wherein the first protective film is a single-layer PTFE film, and the second protective film is a double-layer protective film formed by compounding a PTFE film and non-woven fabrics;
PTFE membrane, thickness: 0.002-0.3mm, air permeability: 2000-30000 ml/cm/min;
nonwoven fabric, thickness: 0.1-0.5mm, air permeability: 5000-;
the double-layer protective film is prepared by a PTFE film and non-woven fabric by a thermal compounding machine, and the thermal compounding temperature is set to be 80-200 ℃.
The utility model adopts the above technical scheme, compare with prior art, have following advantage:
1. liquid such as water, tobacco tar and the like cannot remain on the protective film or in the peripheral area, and the normal inlet and outlet of airflow cannot be obstructed.
2. The airflow sensor can be used in a harsh environment, such as 192 hours of soaking in tobacco tar, and still can work normally.
3. The utility model discloses process flow is simple, can carry out spraying or soaking operation on the production water line, and the stoving time is short or direct room temperature dries.
Drawings
FIG. 1 is a schematic view of a prior art airflow sensor from a first perspective;
FIG. 2 is a schematic diagram of a second perspective of a prior art airflow sensor configuration;
FIG. 3 is another schematic diagram of a prior art airflow sensor;
FIG. 4 is a cross-sectional view of a prior art air flow sensor with a protective screen;
FIG. 5 is a top view of a prior art airflow sensor with a protective screen;
fig. 6 is a schematic structural view of an airflow sensor according to embodiment 1 of the present invention;
fig. 7 is a schematic structural view of an airflow sensor according to embodiment 2 of the present invention;
FIG. 8 is a schematic view of the protective film of embodiment 1 of the present invention in a mounted state;
FIG. 9 is a schematic view of the protective film of embodiment 2 of the present invention in a mounted state;
fig. 10 is a first installation schematic diagram of the airflow sensor according to embodiments 1 and 2 of the present invention;
fig. 11 is a schematic view of a second installation of the airflow sensor according to embodiments 1 and 2 of the present invention;
fig. 12 is a third schematic view of the installation of the airflow sensor according to embodiments 1 and 2 of the present invention;
in the figure, the position of the upper end of the main shaft,
1-an airflow sensor body, 2-an airflow hole, 3-an air inlet hole, 4-an air outlet hole protective film, 5-an air inlet hole protective film, 7-a cable, 8-a support component, 9-a PCB (printed Circuit Board) A, 10-a PCB B, 11-a reserved air hole, 12-liquid residue and 13-a dustproof net.
Detailed Description
In order to clearly understand the technical features, objects and effects of the present invention, the detailed embodiments of the present invention will be described with reference to the accompanying drawings, and those skilled in the art will understand that the following does not limit the scope of the present invention.
There are also various forms of airflow sensor construction, which are generally similar in construction.
The air outlet protective film 4 and the air inlet protective film 5 are respectively protective films subjected to oleophobic and hydrophobic treatment, have the same structure and components, and are conveniently called as the air outlet protective film 4 and the air inlet protective film 5 for description.
The protective film comprises two kinds, the first kind is a single-layer PTFE film, and the second kind is a double-layer protective film formed by compounding a PTFE film and non-woven fabrics.
PTFE membrane, thickness: 0.002-0.3mm, air permeability: 2000-30000 ml/cm/min.
Nonwoven fabric, thickness: 0.1-0.5mm, air permeability: 5000-.
The double-layer protective film is prepared by a PTFE film and non-woven fabric by a thermal compounding machine, and the thermal compounding temperature is set to be 80-200 ℃.
The protective films are commercially available protective films.
The method for processing the oleophobic and hydrophobic property of the air flow sensor comprises primary oleophobic and hydrophobic property processing and secondary oleophobic and hydrophobic property processing.
The primary oil-repellent and water-repellent treatment steps are as follows:
1) firstly, immersing the protective film into the solution 1 for 1-5s, then taking out the protective film and drying for 2-10 minutes at the drying temperature of 50-80 ℃;
the solution 1 comprises the following components in percentage by weight: 3-10 parts of fluorine-containing compound perfluorooctyl silane, 90-100 parts of normal hexane, 10-20 parts of ethanol and 2-10 parts of acetic acid;
2) taking out the dried protective film, and cutting the protective film into a required shape and size by using a die cutting machine;
3) protective films subjected to one-time oleophobic and hydrophobic treatment are respectively fixed on the airflow hole 2 and the air inlet 3 of the airflow sensor, and the fixing mode can be pasting or laser ultrasonic welding.
Pasting: generally, the protective film is adhered to the airflow hole 2 or the air inlet hole 3 of the airflow sensor by using a double-sided adhesive tape.
Laser ultrasonic welding: the protective film is firstly placed on the airflow hole 2 or the air inlet 3 of the airflow sensor, and the protective film and the airflow sensor are welded and fixed together by a laser ultrasonic welding machine.
The secondary oil-repellent and water-repellent treatment steps are as follows:
1) carrying out spraying treatment or soaking treatment on the airflow sensor fixed with the protective film in the solution 2;
2) and taking out the airflow sensor after the spraying or soaking treatment, and drying or naturally airing at room temperature.
The components and the component proportion of the solution 2 are as follows: 1-15 parts of acidic nano silica sol, 2-10 parts of acetic acid, 0.1-1 part of 3-aminopropyltriethoxysilane and 2-10 parts of fluorine-containing POSS, and dispersing in 50-90 parts of absolute ethyl alcohol to obtain the product.
And (3) spraying treatment: and uniformly spraying the solution 2 on the surface of the airflow sensor stuck with the protective film by using a paint spraying gun, wherein the nozzle opening of the paint spraying gun is 0.2-1.5mm, the air pressure of the paint spraying gun is 0.2-0.5MPa, and the distance from the nozzle to the surface to be sprayed is 20-80 cm. And taking out the sprayed airflow sensor, and keeping the drying temperature at 50-80 ℃, and drying for 1-8 minutes or naturally airing at room temperature for 0.5-4 hours.
Soaking treatment: and completely immersing the airflow sensor fixed with the protective film into the solution 2, taking out after 1-5 seconds, maintaining the drying temperature at 50-80 ℃, and drying for 2-10 minutes or naturally airing at room temperature for 0.5-8 hours.
And (3) installing the airflow sensor after the oleophobic and hydrophobic treatment:
the airflow sensor after primary oleophobic and hydrophobic treatment and secondary oleophobic and hydrophobic treatment is installed on a product, and the installation of the airflow sensor generally has the following three modes: the air flow sensor is electrically connected with the driving or power supply part through a cable 7, and is welded on a PCB A9 in a straight-inserting mode, and is welded on a PCB B10 in a surface-mounted mode.
As shown in fig. 10, the step of electrically connecting with the driving or power supply portion through the cable 7 is as follows:
1) welding pins of the airflow sensor with cables 7 respectively;
2) and connecting the welded cable 7 with a driving or power supply part to complete the installation of the airflow sensor.
As shown in fig. 11, the steps of soldering the airflow sensor to the PCB in-line are as follows:
1) a supporting component 8 is welded on the PCB A9, and the supporting component 8 plays a role in supporting the airflow sensor;
2) the pins of the direct-insertion type airflow sensor are placed in corresponding bonding pads of a PCB A9, the bottom of the airflow sensor just falls on a supporting component 8, and the supporting component 8 can ensure that the air inlet 3 is away from the PCB A9 by a certain distance and cannot block the air inlet 3;
3) and after the airflow sensor is fixed, welding is carried out, and the installation of the airflow sensor is completed.
As shown in fig. 12, the steps of surface mount soldering the airflow sensor to the PCB are as follows:
1) coating solder paste on a corresponding bonding pad on the PCB B by using the surface-mounted airflow sensor;
2) melting the solder paste, and uniformly coating the solder paste on the bonding pad;
3) the air inlet 3 of the surface-mounted airflow sensor is opposite to the reserved air hole 11 of the PCB B10, the surface-mounted airflow sensor is placed, and meanwhile, the welding work of the airflow sensor is completed when the airflow sensor is hot;
4) the air inlet protective film 5 subjected to the primary oleophobic and hydrophobic treatment is fixed on the reserved air hole 11 on the reverse side of the PCB B10, the air inlet protective film 5 just covers the reserved air hole 11, and the fixing mode can be pasting or laser ultrasonic welding.
And (3) performing tertiary oleophobic and hydrophobic treatment: and carrying out three times of hydrophobic and oleophobic treatment on the mounted surface-mounted airflow sensor and the PCB B10 by using the solution 2, wherein the treatment modes are as follows:
1) spraying solution 2 to the airflow sensor and the area of the PCB B10 with the protective film for three times
And (5) performing hydrophobic and oleophobic treatment.
2) The airflow sensor and the PCB B10 are taken as a whole, the upper and lower whole surfaces of the airflow sensor and the PCB are sprayed with the solution 2, and three times of hydrophobic and oleophobic treatment are carried out.
3) The airflow sensor and the PCB B10 are integrated, and only the airflow sensor is fixed on the PCB
Carrying out three times of hydrophobic and oleophobic treatment on the area of the protective film, and carrying out three times of hydrophobic and oleophobic treatment on the bottom surface of the whole PCB B10; or the whole upper surface is treated, and the lower surface is subjected to three times of hydrophobic and oleophobic treatment only on the area of the protective film on the bottom surface of the PCB B10.
4) And (3) spraying or soaking all the surfaces of the PCB B10 with the solution 2, and performing hydrophobic and oleophobic treatment for three times.
In order to clearly show the implementation effect of the utility model to the technicians in the field, a ventilation quantity contrast test and a tobacco tar soaking contrast test are specially carried out;
1. air permeability comparative test
Taking 5 groups of numbered protective films, testing the air permeability of the 5 groups of protective films by using air permeability equipment, wherein the air permeability is test data before treatment, and the test is carried out on the 5 groups of protective films treated by the solution 1 and the solution 2 respectively after treatment, and the result is shown in the following table.
According to the table, the air permeability difference of the protective film before and after treatment (1259-1236)/1259 =1.84% can be ignored in the practical use of the airflow sensor.
2. Tobacco tar soak contrast test
5 groups of dust screens commonly used in the prior art are taken and fixed on 5 groups of airflow sensors, and the 5 airflow sensors are respectively marked with the numbers of 1-5.
Another 5 groups of untreated protective films are respectively fixed on 5 airflow sensors, and the 5 airflow sensors are respectively marked with the numbers of 11-15.
And treating another 5 groups of the same protective films according to the solution 1, then respectively fixing the protective films to another 5 groups of airflow sensors of the same type, treating the airflow sensors by using the solution 2, and respectively marking the airflow sensors with 21-25 after treatment.
The 15 groups of samples are soaked in the same tobacco tar for 24H, 48H, 96H and 192H, and then the confirmation results are taken out, wherein the confirmation results are two aspects: firstly, install them and see on the electron cigarette and whether can normally work, second, if can not normally work, take off the air current sensor, pull out the protecting film with tweezers, look over whether the tobacco tar gets into inside the air current sensor, see the table below as a result.
As can be seen from the above experimental data: after the airflow sensors fixed with common dust screens in the prior art are soaked for 24 hours, 5 groups of airflow sensors cannot work Normally (NG), the dust screens are pulled out by tweezers, and smoke oil traces are found in the airflow sensors.
After 5 groups of airflow sensors fixed with untreated protective films are soaked for 24 hours, 2 groups of airflow sensors can work normally (OK), and the other 3 groups of airflow sensors can not work normally, and the dust screen is pulled out by tweezers, so that smoke traces are found in the 3 groups of airflow sensors; after the air flow sensors are soaked for 48 hours, the 2 groups of air flow sensors which originally normally work cannot normally work, and the dust screen is pulled out by using tweezers, so that the 2 groups of air flow sensors are all provided with smoke traces.
After being soaked for 192 hours, the 5 groups of airflow sensors processed by the solution 1 and the solution 2 still can work normally.
From the above experimental data it can be concluded that: the utility model provides a material such as water, oil get into the inside problem of air current sensor, do not influence the circulation of gas simultaneously.
The foregoing is illustrative of the best mode of the invention, and details not described herein are within the common general knowledge of a person of ordinary skill in the art. The protection scope of the present invention is subject to the content of the claims, and any equivalent transformation based on the technical teaching of the present invention is also within the protection scope of the present invention.
Claims (4)
1. The utility model provides an airflow sensor, includes airflow sensor body (1), is equipped with airflow hole (2) and inlet port (3) on airflow sensor body (1), its characterized in that:
protective films subjected to oleophobic and hydrophobic treatment are respectively arranged on the airflow hole (2) and the air inlet hole (3).
2. An airflow sensor as defined in claim 1, wherein:
the air inlet (3) is arranged at the bottom of the airflow sensor body (1).
3. An airflow sensor as defined in claim 1, wherein:
the air inlet (3) is arranged on the side surface of the airflow sensor body (1).
4. An airflow sensor according to claim 1, 2 or 3 wherein:
the protective film is a single-layer PTFE film;
or a double-layer protective film formed by compounding a PTFE film and non-woven fabric;
a PTFE film: the thickness is 0.002-0.3mm, the air permeability is 2000-30000 ml/cm/min;
non-woven fabrics: the thickness is 0.1-0.5mm, and the air permeability is 5000-;
the double-layer protective film is prepared by a thermal compounding machine of a PTFE film and non-woven fabric, and the thermal compounding temperature is 80-200 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023098380.7U CN214179145U (en) | 2020-12-21 | 2020-12-21 | Airflow sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023098380.7U CN214179145U (en) | 2020-12-21 | 2020-12-21 | Airflow sensor |
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| CN214179145U true CN214179145U (en) | 2021-09-14 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022135198A1 (en) * | 2020-12-21 | 2022-06-30 | 烟台耐沃新材料有限公司 | Airflow sensor and oleophobic and hydrophobic treatment method |
| US11844376B2 (en) * | 2018-07-05 | 2023-12-19 | Shenzhen Ivps Technology Co., Ltd. | Pneumatic sensor and electronic cigarette having same |
-
2020
- 2020-12-21 CN CN202023098380.7U patent/CN214179145U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11844376B2 (en) * | 2018-07-05 | 2023-12-19 | Shenzhen Ivps Technology Co., Ltd. | Pneumatic sensor and electronic cigarette having same |
| WO2022135198A1 (en) * | 2020-12-21 | 2022-06-30 | 烟台耐沃新材料有限公司 | Airflow sensor and oleophobic and hydrophobic treatment method |
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