CN116114913A - Protective film and be provided with electron cigarette of this protective film - Google Patents

Abstract

The invention relates to a protective film and an electronic cigarette provided with the same. The protective film is provided with a protective body, one end of the protective body is provided with a fold structure, the other end of the protective body can be matched with the microphone of the electronic cigarette, a sealing space with a telescopic size is formed between the fold structure and the microphone of the electronic cigarette, aerosol mist, tobacco tar, condensate, liquid leakage and the like generated in the working process of the electronic cigarette can be effectively prevented, the microphone of the electronic cigarette is prevented from being corroded, and then the safety risk brought by the damage of the microphone and self-starting of the electronic cigarette is effectively prevented.

Description

Protective film and be provided with electron cigarette of this protective film

Technical Field

The invention relates to the technical field of electronic atomizers, in particular to a protective film and an electronic cigarette provided with the protective film.

Background

The electronic cigarette is also called virtual cigarette, electronic atomizer, steam cigarette, etc. and has the same appearance as cigarette and similar taste as cigarette, and is mainly used for simulating smoking feeling on the premise of not affecting health so as to be used for stopping smoking or replacing cigarette.

Electronic cigarettes generally comprise a suction nozzle, a liquid storage component, an atomization component, a battery component and the like. The liquid storage component is used for storing the nebulizable liquid; the atomizing assembly generally comprises a heating element and a liquid guide body, wherein the heating element is arranged on the liquid guide body, and the liquid guide body is in contact with the liquid storage assembly, so that atomized liquid in the liquid storage assembly is absorbed and transferred to the heating element for heating and atomizing to form smokeable smoke; the battery assembly is used for providing energy required for heating the heating body. When the user sucks from the suction nozzle, external air enters the atomization assembly and enters the oral cavity of the user from the suction nozzle together with the atomization forming smoke so as to be sucked by the user.

The existing disposable electronic cigarette generally adopts a microphone (airflow sensor) to control trigger work, when a user sucks, air pressure change can be generated in the electronic cigarette device, and the microphone can detect the air pressure change, so that whether the electronic cigarette is in a sucking state or not is judged, and the working state of the electronic cigarette is further controlled. When a user sucks, most of the smoke generated by the electronic cigarette is sucked into the oral cavity by the user, and a small part of the smoke remains in the device. The residual smoke may form condensation inside the e-cigarette. The existing electronic cigarette is not provided with a shielding protection structure on the surface of the microphone, and the sensitivity of the microphone for detecting air pressure change is easily affected by the structure, so that the normal use of the electronic cigarette is affected. But the naked miaow head is extremely easy to contact with the formed condensate or residual smog directly forms the condensate on the surface of the miaow head, and then damages the miaow head, causes the miaow head to start certainly or not to start the harmful phenomena such as take place, brings safe in utilization risk and bad use experience for the electron cigarette.

Disclosure of Invention

Accordingly, an object of the present invention is to provide a protective film and an electronic cigarette provided with the protective film, which solve the problem of damage to a microphone caused by corrosion of aerosol mist, tobacco tar formed by condensation of the aerosol mist, condensate formed in a sucking process, and the like in the prior art.

In order to achieve the above object, a first aspect of the present invention provides a protective film, which is provided with a protective body, wherein one end of the protective body is formed with a fold structure, and the other end of the protective body can be matched with a microphone of an electronic cigarette to form a sealing space with a telescopic size between the fold structure and the microphone of the electronic cigarette.

Further, the thickness of the protective film is between 0.01 and 0.5 mm.

Further, the protective film is one of a polypropylene PP protective film, a polyethylene PE protective film or a polyester PET protective film and other ductile material protective films.

Further, the pleated structure is a folded structure, the folded structure being made up of 1 or more folded structural units.

Further, the overall shape of the folding structure is a columnar body, and the folding structure can stretch and retract along the axial direction of the columnar body.

Further, the thickness of the folded structure is any dimension between 0.05 and 0.3 mm.

Further, the overall shape of the folding structure is a sphere, and the folding structure can stretch and retract along the radial direction of the sphere.

A second aspect of the present invention provides an electronic cigarette, in which a heating element for heating an oil tank to atomize tobacco tar is provided, and a microphone for controlling the heating element to operate are provided, a protective film as described in any one of the above is fixed above the microphone for isolating and protecting the microphone from tobacco tar in the oil tank, and a sealed microphone upper space is formed between the protective film and an upper surface of the end of the microphone.

Further, the protective film has a folded state and an unfolded state, the folded structure of the protective film stretches and contracts relative to the microphone to switch between the folded state and the unfolded state, when the protective film is in the folded state, the air pressure of the upper space of the microphone is at a normal level, and when the protective film is in the unfolded state, the air pressure of the upper space of the microphone is at a negative pressure level.

Further, the electronic cigarette is internally provided with a microphone support for fixing the microphone inside the electronic cigarette, the upper part of the microphone support is provided with a microphone upper air inlet communicated with the internal space of the battery compartment, the protective film penetrates through the microphone upper air inlet and the microphone upper surface to form a sealed microphone upper space, a microphone lower space is formed between the microphone support and the microphone lower surface, the microphone lower space is communicated with the atmosphere, and air between the microphone upper space and the microphone lower space is not communicated.

Further, the electronic cigarette is further internally provided with a microphone support for fixing the microphone in the electronic cigarette, the upper portion of the microphone support is provided with a microphone upper air inlet communicated with the internal space of the battery compartment, the protective film is fixed at the microphone upper air inlet, and the protective film is matched with the microphone support to form a sealed microphone upper space between the microphone upper surface, a microphone lower space is formed between the microphone support and the microphone lower surface, the microphone lower space is communicated with the atmosphere, and air between the microphone upper space and the microphone lower space is not communicated.

According to the electronic cigarette provided by the invention, the protective film is arranged on the microphone bracket, so that aerosol mist, tobacco tar, condensate and the like generated in the working process of the electronic cigarette are effectively prevented from corroding the microphone. The problem of damage miaow head, perhaps cause miaow head self-starting, miaow head not start etc. bad phenomenon take place is solved, the safe risk of electron cigarette has been reduced and good use experience has been brought for the user.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic perspective view of a protective film according to a first embodiment of the present invention;

fig. 2 is a schematic perspective view showing a protective film stretched to the maximum in the first embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a protective film according to a first embodiment of the present invention;

fig. 4 is a schematic cross-sectional view illustrating a first method for assembling a protective film of an electronic cigarette according to a second embodiment of the present invention;

FIG. 5 is an enlarged view of a portion of the encircled portion of FIG. 4;

fig. 6 is a partially enlarged view showing a sectional structure of a second method for assembling a protective film of an electronic cigarette according to a second embodiment of the present invention;

FIG. 7 is a schematic cross-sectional view of a third embodiment of the present invention when the protective film is stationary;

FIG. 8 is a schematic cross-sectional view of a protective film according to a fourth embodiment of the present invention;

fig. 9 is a schematic perspective view of a protective film according to a seventh embodiment of the present invention when the protective film is stationary.

Wherein, in the above drawings, the reference numerals of the embodiments of the present invention are as follows:

air tap 1, air flue 2, heat-generating body 3, oil tank 4, battery compartment 5, miaow head 6, miaow head support 7, casing 8, bottom air inlet 9, miaow head lower air inlet 10, miaow head upper space 11, miaow head lower space 12, protection body 13, miaow head upper air inlet 14, atmosphere 15, beta structure 16, beta structure unit 17, oil tank air inlet 18.

Detailed Description

Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "connected," 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. The specific meaning of the terms described above will be understood to those of ordinary skill in the art in a specific context.

The terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," and the like are used as references to orientations or positional relationships based on the orientation or positional relationships shown in the drawings, or the orientation or positional relationships in which the inventive product is conventionally disposed in use, merely for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore are not to be construed as limiting the invention.

The terms "first," "second," "third," and the like, are merely used for distinguishing between similar elements and not necessarily for indicating or implying a relative importance or order.

The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a list of elements does not include only those elements but may include other elements not expressly listed.

The following will each explain in detail by means of specific examples.

The invention provides a protective film, which is provided with a protective body 13, wherein one end of the protective body 13 is provided with a telescopic fold structure, the other end of the protective body 13 can be matched with a microphone of an electronic cigarette, and a fold structure with a telescopic sealing space is formed between the fold structure and the microphone of the electronic cigarette. The protective film is made of polypropylene PP, polyethylene PE or polyester PET, or may be formed of a suitable ductile material, having gas-impermeable and liquid-impermeable properties.

Specifically, as shown in fig. 1, 2 and 3, in the first embodiment of the present invention, the overall shape of the protector 13 is a columnar body, and in particular, in the first embodiment of the present invention, the overall shape of the protector 13 is a cylindrical body. The fold structure of the protecting body 13 means that a folding structure 16 capable of stretching the protecting body 13 along the axial direction is arranged on the side surface of the cylinder of the protecting body 13, the folding structure 16 is like a foot-operated inflating cylinder, the folding structure 16 is composed of a plurality of folding structure units 17 which can be arranged in a stacking manner along the axial direction, and the axial section shape of the folding structure units 17 is in a sawtooth shape or a wave shape. In this embodiment, the protector 13 is made of a polypropylene PP film by hot press molding, and the thickness of the protector 13 is 0.3 mm (generally, the thickness is preferably between 0.01 and 0.5 mm). The folding structure 16 of the protecting body 13 of this embodiment is composed of two folding structure units 17, the thickness of the folding structure 16 is any size between 0.05 mm and 0.3 mm, and the thickness of the protecting body 13 of this embodiment belongs to a film structure, so that the self weight of the folding structure 16 is very small, only microgravity is generated, and the air pressure of the microphone upper space 11 is not affected by the overlarge gravity. The polypropylene PP, the polyethylene PE or the polyester PET adopted by the protective body 13 has plasticity but not elasticity, so that the folding structure 16 of the protective body 13 cannot be pushed to shrink by additional reverse acting force generated by elasticity after being stretched and deformed, and the air pressure of the upper space 11 of the microphone is further influenced to change.

As shown in fig. 4 and 5, a second embodiment of the present invention provides an electronic cigarette, in which a battery compartment 5 is disposed in a housing 8, and a bottom air inlet 9 communicating with the battery compartment 5 is provided on the housing 8, and the bottom air inlet 9 is used to allow the atmosphere 15 to enter the battery compartment 5.

As shown in fig. 4 and 5, in the second embodiment of the present invention, the microphone 6 is disposed in the battery compartment 5, the microphone 6 is fixed in the battery compartment 5 by the microphone bracket 7, and the microphone 6 is fixed in the microphone bracket 7. According to the first embodiment of the invention, the cylindrical side surface of the protective body 13 is wrapped on the side surface of the microphone 6, and the protective film is adhered by glue or fixed together by means of physical friction between the cylindrical inner side surface of the protective body 13 and the side surface of the microphone 6, so that the protective film is fixed on the microphone 6 of the electronic cigarette. The upper part of the microphone bracket 7 is provided with a microphone upper air inlet 14 communicated with the inner space of the battery compartment 5, the protecting body 13 penetrates through the microphone upper air inlet 14 and a sealed microphone upper space 11 with a telescopic size is formed between the microphone 6 of the electronic cigarette and the upper surface of one end, close to the air channel 2, of the microphone 6, and one end, close to the air channel 2, of the protecting body 13 is sealed and protected. A microphone lower space 12 is formed between the microphone bracket 7 and the lower surface of the microphone 6, and the microphone upper space 11 is not communicated with the air between the microphone lower space 12. The shell 8 is also provided with a microphone lower air inlet 10 communicated with the microphone lower space 12, and the microphone lower air inlet 10 is used for communicating the microphone lower space 12 with the external atmosphere 15.

As shown in fig. 4 and 5, the electronic cigarette further comprises an air tap 1, an air flue 2, a heating body 3, an oil tank 4 and an oil tank air inlet 18. Wherein, heat-generating body 3 with air flue 2 is located in oil tank 4, be provided with the opening that is used for the horizontal interlude of this heat-generating body 3 on this air flue 2 inner wall, this heat-generating body 3 is bar-shaped structure, transversely alternates in the middle of this air flue 2, and the diameter of this heat-generating body 3 sets up to be less than the diameter of this air flue 2, consequently can not block up this air flue 2. The structure of the heating body 3 generally comprises an oil guiding body and a heating piece, wherein the oil guiding body is used for guiding tobacco tar in the oil tank 4 to the heating piece, and the heating piece heats the tobacco tar on the oil guiding body to generate smoke. The structural form is generally as follows: 1. a heating element structure formed by winding heating wires or heating meshes around the oil guide body; 2. the surface of the block-shaped oil body is printed with a heating coating, a heating circuit or a heating body structure formed by combining the block-shaped oil body and a metal heating net sheet. The oil guide body can be made of porous materials such as cotton, fiber, non-woven fabric, ceramic and the like or materials capable of adsorbing and transmitting tobacco tar. The heating body 3 is used for generating heat, so that tobacco tar in the oil tank 4 is atomized into aerosol mist, and the generated aerosol mist is mixed with air through the air channel 2 by air flow caused by upward suction and enters the oral cavity. The oil tank air inlet 18 is arranged between the battery compartment 5 and the air passage 2 and is used for exchanging substances between the battery compartment 5 and the air passage 2. The air passage 2 is used for communicating the air tap 1 with the oil tank air inlet 18. The microphone 6 is a common electronic cigarette control sensor, and controls the starting and stopping of the electronic cigarette by detecting and calculating the air pressure difference between the microphone upper space 11 and the microphone lower space 12.

When the air pressure outside the protective body 13 changes, the folded structure 16 is stretched and deformed, so that the volume of the sealed space of the upper space 11 of the microphone changes, and an air pressure difference is generated between the upper space 11 of the microphone and the lower space 12 of the microphone. When the stacked structure 16 of the protective body 13 is stretched and deformed to the maximum, the microphone upper space 11 is in a negative pressure state, and the pressure difference with the atmospheric pressure can reach more than 300 pa. When the micro negative pressure outside the protective body 13 disappears, the folding structure 16 is restored to the folded shape under the action of the micro negative pressure of the upper space 11 of the microphone, and the volume of the sealed space of the upper space 11 of the microphone is contracted and deformed.

The protection body 13 can prevent harmful substances such as aerosol fog, tobacco tar, condensate and the like from entering the microphone upper space 11, so that the microphone 6 is prevented from being damaged, the phenomenon that the microphone 6 is started or not started automatically and the like is avoided, the safety risk of the electronic cigarette is reduced, and good use experience is brought to a user.

When the user uses the e-cigarette, the direction of the air flow of the atmosphere 15 when the e-cigarette is operated is shown by the arrow in fig. 4. The upward suction of the user causes the air of the atmosphere 15 to enter the battery compartment 5 from the bottom air inlet 9, and the air of the battery compartment 5 is sucked into the user's mouth through the oil compartment air inlet 20, the air duct 2 and the air tap 1, at which time a slight negative pressure is generated in the battery compartment 5. The protective body 13 is stretched and deformed under the action of the micro negative pressure of the battery compartment 5, the shape of the protective body 13 is changed from the resting shape to the stretching shape, and the folding structure 16 is unfolded. Since the protector 13 is a gas-impermeable and liquid-impermeable film and the air in the sealed head-space 11 is not changed but the volume of the protector 13 is increased, the air pressure in the head-space 11 is changed. The air pressure of the microphone upper space 11 has positive correlation with the air pressure of the battery compartment 5, and the microphone lower space 12 is communicated with the atmosphere 15 outside the electronic cigarette, so as to ensure that the air pressure of the microphone lower space 12 is fixed. At this time, the air pressure of the upper space 11 and the air pressure of the lower space 12 form a difference, and when the difference exceeds a preset threshold value, the microphone 6 is caused to start working. The electronic cigarette generates heat through the heating body 3, so that tobacco tar in the oil tank 4 is atomized into aerosol mist, and the generated aerosol mist is mixed with air in the battery compartment 5 through air flow caused by upward suction and enters an oral cavity through the air channel 2 and the air tap 1. When the user stops pumping upwards, the micro negative pressure in the battery compartment 5 disappears, the protective body 13 is restored to a static state under the action of the air pressure of the microphone upper space 11, and the folding structure 16 is contracted and folded again. At this time, the difference between the air pressure in the upper space 11 and the air pressure in the lower space 12 becomes smaller gradually, and when the difference is lower than the preset threshold value, the microphone 6 is stopped, and the heat generating body 3 stops generating heat. The preset threshold for the difference is 150pa. After the protective body 13 deforms and stretches under the action of the micro negative pressure of the battery compartment 5, the upper space 11 of the microphone is in a negative pressure state, and at this time, the pressure difference value between the air pressure of the upper space 11 of the microphone and the air pressure of the lower space 12 of the microphone is more than 300pa and exceeds a preset threshold value. Thereby the microphone 6 is started, and the heating element 3 generates heat.

As shown in fig. 5, the protective film according to the second embodiment of the present invention is stretched and deformed under the action of the slight negative pressure of the battery compartment 5, the protective body 13 is changed from the shape at rest to the shape at stretching, and the folding structure 16 is unfolded.

Fig. 5 is a schematic cross-sectional view showing a first method of assembling a protective film according to a second embodiment of the present invention. The cross section of the cylindrical side surface of the protecting body 13 assembled between the microphone bracket 7 and the microphone 6 is set to be in a shape matched with the outline of the microphone 6, so that the protecting body 13 is sleeved on the outer side surface of the microphone 6 at one end close to the air passage 2, and the protecting body can be fixedly connected by using glue to paste, metal wires or a silica gel ring to tighten or adding friction pieces in a friction mode.

Fig. 6 is a schematic cross-sectional view showing a second method of assembling a protective film according to a second embodiment of the present invention. The microphone 6 is arranged in the microphone bracket 7, the space inside the microphone bracket 7 is divided into a microphone upper space 11 and a microphone lower space 12 by the microphone, wherein the microphone upper space 11 is communicated with the inner cavity of the battery compartment 5, the microphone lower space 12 is communicated with the atmosphere 15 through a microphone lower air inlet 10 on the shell 8, the protecting body 13 is assembled on the outer side surface of the microphone bracket 7 and is close to one end of the microphone upper space 11, the microphone 6 is isolated and sealed inside the microphone bracket 7, and the microphone upper space 11 is sealed and isolated from the inner cavity of the battery compartment 5. The cross section of the cylinder side of the protecting body 13 is set to be in a shape matched with the outline of the outer side of the microphone bracket 7, and is used for sleeving the protecting body 13 on one end, close to the air inlet 14 on the upper part of the microphone, of the outer side of the microphone bracket 7, and the protecting body is fixedly connected in a mode of using glue to paste, using metal wires or a silica gel ring to tighten, using friction-increasing pieces to rely on friction force and the like.

As shown in fig. 7, a protective film according to a third embodiment of the present invention is provided with a protective body 13, wherein the folded structure 16 of the protective body 13 is formed by five folded structure units 17, the protective body 13 is made of polyester PET material, the thickness of the protective body 13 is between 0.01 and 0.5 micrometer, preferably 0.5 micrometer, the thickness of the folded structure 16 is any size between 0.05 and 0.3 millimeter, and after the protective body 13 is deformed and stretched under the action of micro negative pressure of the battery compartment 5, the upper space 11 of the microphone is in a negative pressure state, and the differential pressure value between the protective body and the lower space 12 of the microphone is more than 160pa and exceeds a preset threshold value. Thereby the microphone 6 is started, and the heating element 3 generates heat.

As shown in fig. 8, a protection film according to a fourth embodiment of the present invention is provided with a protection body 13, wherein the folding structure 16 of the protection body 13 is formed by one folding structure unit 17, the protection body 13 is made of polypropylene PP material, the thickness of the protection body 13 is between 0.01 and 0.5 micrometer, preferably the thickness is 0.03 micrometer, the thickness of the folding structure 16 is any size between 0.05 and 0.3 millimeter, and after the protection body 13 is deformed and stretched under the action of micro negative pressure of the battery compartment 5, the upper space 11 of the microphone is in a negative pressure state, and the differential pressure value between the upper space and the lower space 12 of the microphone is more than 460pa and exceeds a preset threshold value. Thereby the microphone 6 is started, and the heating element 3 generates heat.

The invention also provides a protective film in a fifth embodiment which is compared with the successful embodiment, and a protective body 13 is arranged, the folding structure 16 of the protective body 13 is formed by eight folding structure units 17, the protective body 13 is made of polypropylene PP material, the thickness of the protective body 13 is between 0.01 and 0.5 micrometer, preferably 0.8 micrometer, the thickness of the folding structure 16 is any size between 0.05 and 0.3 millimeter, and after the protective body 13 is deformed and stretched under the action of micro negative pressure of the battery compartment 5, the upper space 11 of the microphone is in a negative pressure state, and the differential pressure between the protective body and the lower space 12 of the microphone is 120pa and is lower than a preset threshold value. So that the microphone 6 cannot be activated.

The invention also provides a protective film in a sixth embodiment compared with the successful embodiment, the protective film is provided with a protective body 13, the folding structure 16 of the protective body 13 is formed by six folding structure units 17, the protective body 13 is made of polypropylene PP material, the thickness of the protective body 13 is 1 micrometer, the thickness of the folding structure 16 is any size between 0.05 and 0.3 millimeter, and after the protective body 13 is deformed and stretched under the action of micro negative pressure of the battery compartment 5, the upper space 11 of the microphone is in a negative pressure state, and the pressure difference value between the protective body and the lower space 12 of the microphone is 100pa and is lower than a preset threshold value. So that the microphone 6 cannot be activated.

A protective film according to a seventh embodiment of the present invention as shown in fig. 9 is provided with a protective body 13, the protective body 13 having a spherical shape as a whole, a folded structure 16 for enlarging the volume of the protective body 13 in a radial stretching direction being provided on a spherical side surface of the protective body 13, the folded structure 16 being composed of a plurality of folded structure units 17 arranged in a stacked manner, and the folded structure 16 having a zigzag shape or a wavy shape in a radial cross-sectional shape. The protective body 13 can be deformed and stretched along the radial direction under the action of micro negative pressure of the battery compartment 5, the expansion of the sphere is increased, the folding structure 16 is unfolded, and the interval between each folding structure unit 17 is increased

In summary, in the electronic cigarette provided in this embodiment, the technical effect of ventilation but airtight sol fog is achieved by adding the protective film on the microphone 6, so that the aerosol fog, tobacco tar, condensate and the like generated in the working process of the electronic cigarette are effectively prevented from corroding the microphone 6. The problem of miaow 6 corrode the damage, perhaps the miaow that causes because of miaow 6 corrodes the damage from starting, miaow not starts the adverse phenomenon such as take place is solved, reduced the safe risk of electron cigarette and brought good use experience for the user.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the present invention. Accordingly, the scope of the invention should be assessed as that of the appended claims.

Claims (11)

1. A protection film establishes the protection body, its characterized in that, the one end of this protection body is formed with fold structure, and the other end of this protection body can cooperate with the miaow head of electron cigarette and make and form the sealed space of scalable size between this fold structure and the miaow head of electron cigarette.

2. The protective film of claim 1, wherein the protective film has a thickness of between 0.01 and 0.5 millimeters.

3. The protective film according to claim 1, wherein the protective film is one of a polypropylene PP protective film, a polyethylene PE protective film, and a polyester PET protective film.

4. A protective film according to any one of claims 1 to 3, wherein the pleated structure is a folded structure, the folded structure being made up of 1 or more folded structure units.

5. The protective film of claim 4, wherein the folded structure has an overall shape of a cylinder, and the folded structure is axially stretchable along the cylinder.

6. The protective film of claim 4, wherein the folded structure has a thickness of any dimension between 0.05 mm and 0.3 mm.

7. The protective film of claim 4, wherein the folded structure is generally shaped as a sphere, and the folded structure is radially expandable and contractible along the sphere.

8. An electronic cigarette, wherein a heating body for heating oil tank to atomize tobacco tar and a microphone for controlling the heating body to work are arranged, characterized in that a protective film as claimed in any one of claims 1-7 for isolating and protecting the microphone from tobacco tar in the oil tank is fixed above the microphone, and a sealed microphone upper space is formed between the protective film and the upper surface of the end of the microphone.

9. The electronic cigarette of claim 8, wherein the protective film has a folded state and an unfolded state, the folded structure of the protective film being expanded and contracted relative to the microphone to switch between the folded state and the unfolded state, the air pressure of the microphone upper space being at a normal level when the protective film is in the folded state, and the air pressure of the microphone upper space being at a negative pressure level when the protective film is in the unfolded state.

10. The electronic cigarette according to claim 8, wherein a microphone holder for holding the microphone therein is further provided in the electronic cigarette, an upper air inlet is provided in an upper portion of the microphone holder in communication with the battery compartment inner space, the protective film passes through the upper air inlet to form a sealed upper space between the upper air inlet and the upper surface of the microphone, a lower space is formed between the microphone holder and the lower surface of the microphone, the lower space is in communication with the atmosphere, and air between the upper space of the microphone and the lower space of the microphone is not in communication.

11. The electronic cigarette according to claim 8, wherein a microphone holder for holding the microphone therein is further provided, the microphone holder is provided with a microphone upper air inlet communicating with the battery compartment inner space, the protective film is fixed to the microphone upper air inlet, and the protective film forms a sealed microphone upper space with the microphone upper surface by the fitting of the microphone holder, a microphone lower space is formed between the microphone holder and the microphone lower surface, the microphone lower space communicates with the atmosphere, and air between the microphone upper space and the microphone lower space does not communicate.

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