CN108721740B

CN108721740B - Airflow sensor and atomizer

Info

Publication number: CN108721740B
Application number: CN201710311920.9A
Authority: CN
Inventors: 徐传毅
Original assignee: Nazhiyuan Technology Tangshan Co Ltd
Current assignee: Nazhiyuan Technology Tangshan Co Ltd
Priority date: 2017-05-05
Filing date: 2017-05-05
Publication date: 2023-06-23
Anticipated expiration: 2037-05-05
Also published as: CN108721740A; WO2018201751A1

Abstract

The invention discloses an airflow sensor and an atomizer, which comprises: a hollow housing, at least two sensing units disposed inside the hollow housing, wherein each sensing unit includes a first friction layer and a second friction layer; the first friction layer is fixed on the inner wall of the hollow shell, and the second friction layer is arranged opposite to the first friction layer; and, the air flow channel is formed inside the hollow shell, and the air flow in the air flow channel acts on the first friction layer and/or the second friction layer so as to enable the first friction layer and the second friction layer to rub against each other; wherein, at least two sensing units form airtight space, airtight space with the air current passageway does not communicate. The invention solves the problems that the accuracy of the air flow sensor in the prior art is easily affected by damp factors, the damage of elements can not be timely reminded, and the production cost is higher.

Description

Airflow sensor and atomizer

Technical Field

The invention relates to the technical field of sensing, in particular to an airflow sensor and an atomizer.

Background

At present, the global climate is continuously warmed, the environmental pollution is continuously aggravated, and the climate during season transition is suddenly warmed and suddenly cooled, so that the cases of patients with global respiratory diseases are continuously increased, and the normal life of people is seriously influenced. In this case, in order to accommodate various complicated treatment conditions and meet the high quality demands of modern people for life, an atomizer for atomizing a water-soluble drug into fine mist particles is generally used to allow a patient to inhale the atomized liquid medicine to relieve the pain. Currently, the types and functions of atomizers in the prior art are also various, and generally include ultrasonic atomizers, compression atomizers, mesh atomizers, and the like.

However, the inventors have found in the practice of the present invention that existing atomizers and air flow sensors employed therewith have the following problems: firstly, the air flow sensor of the existing atomizer has no dampproof structure, so that the situation that the sensitivity and the accuracy are reduced and the air flow sensor in the atomizer cannot work normally is caused when the air flow sensor is influenced by external factors such as moisture and the like; secondly, only one sensing unit is generally arranged in an airflow sensor in the existing atomizer for outputting an electric signal, and once the sensing unit fails, a patient cannot normally complete the whole atomization process, and the situation that medicines are wasted and the like are caused by midway instrument replacement occurs, so that potential safety hazards exist in the existing atomizer; thirdly, the existing atomizer and the adopted airflow sensor are complex in structure and manufacturing process and high in cost, and bring a plurality of inconveniences to industrial production and use of users.

It follows that there is a lack of a safe, highly sensitive and accurate low cost air flow sensor and atomizer in the prior art.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide an airflow sensor and an atomizer which can solve the problems.

According to one aspect of the present invention, there is provided an air flow sensor comprising: a hollow housing, at least two sensing units disposed inside the hollow housing, wherein each sensing unit includes a first friction layer and a second friction layer; the first friction layer is fixed on the inner wall of the hollow shell, and the second friction layer is arranged opposite to the first friction layer; and, the air flow channel is formed inside the hollow shell, and the air flow in the air flow channel acts on the first friction layer and/or the second friction layer so as to enable the first friction layer and the second friction layer to rub against each other; wherein, at least two sensing units form airtight space, airtight space with the air current passageway does not communicate.

According to another aspect of the present invention, there is provided an atomizer comprising: the liquid storage part, the nozzle airflow monitoring part and the atomizer main body, wherein the airflow sensor is arranged in the nozzle airflow monitoring part; the liquid storage component is connected with the atomizer main body and used for storing liquid medicine to be atomized and sprayed; the nozzle airflow monitoring component is connected with the liquid storage component and is used for converting the sensed airflow into an airflow pressure electric signal by utilizing the airflow sensor and spraying the liquid medicine atomized by the atomizer main body into the mouth and the nose of a user; the atomizer main body is electrically connected with the nozzle airflow monitoring component, and is used for spraying the liquid medicine stored in the liquid storage component after atomizing and processing airflow pressure electric signals output by the airflow sensor in the nozzle airflow monitoring component.

Therefore, in the airflow sensor and the atomizer provided by the invention, the airflow sensor is realized by utilizing the friction power generation principle. The air flow sensor and the atomizer are not only provided with the dampproof structure and ensure that the sensitivity and the accuracy of each sensing unit in the air flow sensor are not influenced by external factors such as moisture and the like, so that the air flow sensor has higher accuracy when in work, but also can improve the safety coefficient of the atomizer when in use by arranging at least two sensing units; meanwhile, the airflow sensor and the atomizer provided by the invention also simplify the manufacturing process, reduce the production cost and bring convenience to industrial production and users.

Drawings

FIG. 1a is a schematic perspective view of an airflow sensor according to a first embodiment of the present invention;

FIG. 1b is a schematic cross-sectional view of an airflow sensor according to a first embodiment of the present invention;

FIG. 2a shows an expanded view of the inner wall of a hollow housing when two sensing units are provided on the inner wall of the hollow housing according to the present invention;

FIG. 2b shows an expanded view of the inner wall of the hollow housing when four sensing units are provided on the inner wall of the hollow housing according to the present invention;

FIG. 2c shows an expanded view of the inner wall of the hollow housing when eight sensing units are provided on the inner wall of the hollow housing according to the present invention;

FIG. 3 is a schematic cross-sectional view of an airflow sensor according to a second embodiment of the present invention;

fig. 4 is a schematic perspective view of an airflow sensor according to a third embodiment of the present invention;

FIG. 5 shows a modified schematic view of an air flow sensor according to a first embodiment of the invention;

fig. 6a shows an arrangement according to the invention in relation to a support member;

fig. 6b shows another version of the invention in relation to the arrangement of the support member;

FIG. 7 shows another improved schematic of an airflow sensor according to a first embodiment of the invention;

FIG. 8 shows another improved schematic of an airflow sensor according to a second embodiment of the invention;

FIG. 9a is a functional block diagram of a nebulizer according to yet another embodiment of the invention;

fig. 9b is a schematic structural view of a nebulizer according to still another embodiment of the invention;

fig. 9c is a schematic structural view of a compressed air atomizer body according to still another embodiment of the present invention;

FIG. 9d is a functional block diagram of a signal preprocessing module according to another embodiment of the present invention;

fig. 9e is a schematic functional structure of another atomizer according to another embodiment of the present invention.

Detailed Description

The present invention will be described in detail with reference to the following embodiments for a full understanding of the objects, features and effects of the present invention, but the present invention is not limited thereto.

The present invention provides an air flow sensor comprising: the sensor comprises a hollow shell and at least two sensing units arranged inside the hollow shell, wherein each sensing unit comprises a first friction layer and a second friction layer; the first friction layer is fixed on the inner wall of the hollow shell, and the second friction layer is arranged opposite to the first friction layer; and, the hollow shell forms the air flow channel inside, the air flow in the above-mentioned air flow channel acts on the first friction layer and/or second friction layer, in order to make the first friction layer and second friction layer rub each other; wherein, at least two sensing units form airtight space, and the airtight space is not communicated with the airflow channel. The air flow in the air flow channel can act on at least one friction layer in the first friction layer and the second friction layer, so that the two friction layers rub against each other. Here, the sealed space may be a sealed space formed independently inside each sensor unit, or may be a sealed space formed integrally with a plurality of sensor units in the air flow sensor. For example, the sealed space formed by the at least two sensor units may be a sealed sub-cavity formed between the second friction layer in each sensor unit and the inner wall of the hollow housing, or may be a sealed communicating cavity formed between the sealed communicating layer provided inside the hollow housing and the inner wall of the hollow housing. In short, the present invention is not limited to any specific form or form of the above-mentioned closed space.

It should be noted that, each of the at least two sensing units in the present invention is operated simultaneously. Of course, in the case where some of the sensing units fail to operate due to failure, the remaining sensing units that do not fail remain operating at the same time. In a word, through each sensing unit simultaneous working, on the one hand can promote the accuracy of the sensing result of final output, on the other hand can judge whether the operating condition of whole air current sensor is normal through monitoring the output result of each sensing unit.

Therefore, the air flow sensor is not only provided with a dampproof structure and ensures that the sensitivity and the accuracy of the sensing units in the air flow sensor are not influenced by external factors such as moisture and the like, so that the air flow sensor has higher accuracy in working, but also can improve the accuracy and the safety of the whole sensor by arranging at least two sensing units; meanwhile, the air flow sensor provided by the invention also simplifies the manufacturing process, reduces the production cost and brings convenience to industrial production and use for users.

In order to facilitate understanding of the present invention, a detailed description will be given of a specific structure of the air flow sensor provided by the present invention by way of three specific embodiments. Among them, the air flow sensor in the following three embodiments has a similar basic structure, but the sealing form of the sensing unit inside thereof is different.

Example 1

Fig. 1a and fig. 1b are schematic structural diagrams of an airflow sensor 100 according to a first embodiment of the invention. Fig. 1a is a schematic perspective view of an airflow sensor 100 according to a first embodiment of the present invention; fig. 1b is a schematic cross-sectional structure of an airflow sensor 100 according to an embodiment of the invention. As shown in fig. 1a and 1b, in the present embodiment, the airflow sensor 100 includes: a hollow housing 110, at least two sensing units 120 disposed inside the hollow housing 110. Wherein each sensing unit 120 includes a first friction layer 121 and a second friction layer 122, the first friction layer 121 is fixedly disposed on the inner wall of the hollow housing 110, and the second friction layer 122 is disposed opposite to the first friction layer 121; and, an air flow passage is formed in a portion of the hollow housing 110 where the sensing unit is not disposed, and an air flow in the air flow passage acts on the first friction layer 121 and/or the second friction layer 122 so that the first friction layer 121 and the second friction layer 122 rub against each other. Wherein at least two sensing units 120 form a closed space, and the closed space is not communicated with the air flow channel. The fixing manner of the first friction layer may be various, for example, the first friction layer may be attached to the inner wall, and in particular, the first friction layer may be entirely attached to or partially attached to the inner wall. The friction effect can be further promoted by adopting the mode of partial lamination, specifically, when partial lamination, at least one part of the following parts of the first friction layer can be laminated on the inner wall: at least one of the two ends, and a middle portion. Wherein the first friction layer 121 further comprises a first electrode 1211, the second friction layer 122 further comprises a second electrode 1221, and the side surface of the first electrode 1211 facing the second friction layer 122 is further provided with a first high polymer insulating layer 1212, and/or the side surface of the second electrode 1221 facing the first friction layer 121 is further provided with a second high polymer insulating layer (not shown in the figure); the first electrode 1211 and the second electrode 1221 together serve as a signal output of the air flow sensor.

Specifically, in the first embodiment, the second friction layer 122 in each sensing unit 120 forms a closed sub-cavity with the inner wall of the hollow housing 110, and the first friction layer 121 in each sensing unit 120 is located inside the closed sub-cavity formed between the second friction layer 122 in the sensing unit 120 and the inner wall of the hollow housing 110 (as shown in fig. 1 a). It can be seen that the seal form used in the first embodiment is characterized in that: the sensing units are sealed independently, so that an independent sealing subcavity is formed inside each sensing unit. In addition, in the sealing manner of the first embodiment, the sealing can be directly achieved by the second electrode in the second friction layer 122, and the sealing manner is simple and low in cost.

Next, the respective components included in the air flow sensor in the first embodiment are described separately:

specifically, the hollow housing 110 has a hollow structure, and the shape thereof may be a hollow cylinder, a hollow prism, a hollow truncated cone, a hollow truncated pyramid, or the like, which is not limited in the present invention. For example, as shown in fig. 1a and 1b, the hollow housing 110 in fig. 1a and 1b is hollow cylindrical. The hollow housing 110 may be made of an insulating material or a non-insulating material, which is not limited in the present invention. The hollow housing 110 is preferably made of an insulating material.

Each sensing unit 120 is hermetically disposed on the inner wall of the hollow housing 110, and one side surface of the sensing unit 120 is partially or completely adhered to the inner wall of the hollow housing 110 (as shown in fig. 1 b). So that a portion of the inside of the hollow housing 110 where the sensing unit 120 is not disposed, i.e., a hollow portion of the hollow housing 110 shown in fig. 1a and 1b, forms a gas flow passage for gas to circulate. One side surface of the sensing unit 120 may be completely attached to the inner wall of the hollow housing 110, so that the sensing unit 120 is fixed more firmly; alternatively, one side surface of the sensing unit 120 may be partially attached to the inside of the hollow housing 110, for example, only two ends or a middle portion of the sensing unit 120 need to be attached to the inner wall of the hollow housing 110, so that the attaching manner of the sensing unit 120 is more flexible. In a specific implementation, the manner of attaching the sensing unit 120 to the inner wall of the hollow housing 110 may be set by those skilled in the art according to the actual situation, which is not limited by the present invention. The number of the sensing units 120 may be two or more, and the present invention is not limited to the specific number of the sensing units 120.

Each sensing unit 120 further includes: a first friction layer 121 and a second friction layer 122. Wherein, the first friction layer 121 is partially or completely adhered and fixed on the inner wall of the hollow shell 110, and its shape matches the shape of the inner wall of the hollow shell 110 (as shown in fig. 1 b); the second friction layer 122 is disposed opposite to the first friction layer 121, and is configured to rub against the first friction layer 121 under the action of the gas flow in the gas flow channel when the gas passes through the gas flow channel. Specifically, in the present embodiment, the second friction layer 122 may be an arched friction layer, and a gap is formed between the second friction layer 122 and the first friction layer 121 (for example, the gap may be formed between a middle portion of the second friction layer 122 and the first friction layer 121); alternatively, the second friction layer may be a friction layer of another structure such as a friction layer laminated with the first friction layer (for example, the second friction layer is entirely laminated on the first friction layer, or both ends of the second friction layer are laminated on the inner wall of the casing so as to be laminated with the first friction layer). Specifically, when the second friction layer 122 is an arched friction layer, the arched friction layer is designed in a manner that is beneficial to ensure effective separation between the two friction layers, so as to prevent the situation that the two friction layers cannot be effectively separated after being contacted with each other due to aging of materials. The position where the gap is formed between the second friction layer 122 and the first friction layer 121 is preferably the middle of the second friction layer 122 to achieve the optimal friction effect. However, it is understood that the location of the gap may be at two ends of the second friction layer or other suitable locations, which is not limited by the present invention. When the second friction layer 122 is a friction layer stacked with the first friction layer 121, the air flow flowing through the inside of the air flow channel can act on the first friction layer 121, so that the first friction layer rubs with the second friction layer under the action of the air flow to generate an electric signal; or may act on the second friction layer 122 to cause the second friction layer to rub against the first friction layer under the action of the air flow to generate an electrical signal; alternatively, the friction layers in the whole sensing unit can rub against each other to generate an electric signal under the action of the air flow. Of course, besides the arched friction layer, the second friction layer may also take various other forms which are advantageous for separation, for example, the second friction layer and the first friction layer may together form a sensor unit which approximates a triangle, so that the two friction layers are separated at the apex of the triangle. The inner surfaces of the first friction layer 121 and the second friction layer 122 may have a rectangular shape, or may have other shapes such as a circular shape and a polygonal shape. The first friction layer 121 and the second friction layer 122 together form a sensor unit, also called a friction generator. The case where the two friction layers rub against each other specifically includes various: for example, the two friction layers are relatively displaced in the vertical direction (i.e., in the case of friction in the case of the above-described two friction layers being stacked), and the friction force between the two friction layers is the friction force in the vertical direction; or, the two friction layers are relatively displaced in the vertical direction and the horizontal direction, and the friction force between the two friction layers comprises the friction force in the vertical direction and the friction force in the horizontal direction (namely, the friction condition of the arch structure), so that the optimal friction effect is realized. It will be understood, of course, that the friction between two friction layers includes, but is not limited to, the two friction layers, for example, friction between two friction layers may be a relative displacement in a horizontal direction, and the like, which is not limited by the present invention.

The friction generator in this embodiment will be specifically described below. In an alternative, the friction generator in this embodiment may be a three-layer friction generator. Accordingly, the first friction layer 121 includes a first electrode 1211 and a first high polymer insulating layer 1212; the second friction layer includes a second electrode 1221. Specifically, the first high polymer insulating layer 1212 is disposed on a side surface of the first electrode 1211 facing the second friction layer 122 (as shown in fig. 1 b). Of course, in other alternatives, the first friction layer 121 may also include only the first electrode 1211; the second friction layer 122 includes a second electrode 1221 and a second high polymer insulating layer (not shown in the drawing), and the second high polymer insulating layer is disposed on a side surface of the second electrode 1221 facing the first friction layer 121. In the sensing unit of the three-layer structure, an electric signal is generated by friction between metal and polymer, and the metal easily loses electrons, so that the sensitivity of output current can be improved.

In another alternative, the friction generator in this embodiment may be a four-layer friction generator. Accordingly, the first friction layer 121 includes a first electrode 1211 and a first high polymer insulating layer 1212; the second friction layer includes a second electrode 1221 and a second high polymer insulating layer (not shown). Specifically, the first high molecular polymer insulating layer 1212 is provided on the side surface of the first electrode 1211 facing the second friction layer 122; the second high molecular polymer insulating layer is disposed on a side surface of the second electrode 1221 facing the first friction layer 121. In the sensing unit of the four-layer structure, an electric signal is generated by friction between polymers, so that the same friction power generation effect as that of the friction power generator of the three-layer structure is realized. If the materials of the first polymer insulating layer and the second polymer insulating layer are the same, the amount of charge for triboelectrification is small. Therefore, the first high molecular polymer layer and the second high molecular polymer layer are preferably different in material.

Alternatively, the friction generator in this embodiment may also be a five-layer intervening film structure friction generator. Accordingly, the first friction layer 121 includes a first electrode 1211 and a first high polymer insulating layer 1212; the second friction layer includes a second electrode 1221 and a second high polymer insulating layer (not shown). Wherein the first high molecular polymer insulating layer 1212 is disposed on a side surface of the first electrode 1211 facing the second friction layer 122; the second high molecular polymer insulating layer is disposed on a side surface of the second electrode 1221 facing the first friction layer 121. And, an intervening thin film layer (not shown in the figure) is further provided between the first high polymer insulating layer 1212 and the second high polymer insulating layer of the friction generator of five-layer intervening thin film structure. Wherein the intervening film layer may be disposed on an inner surface of the first friction layer facing the second friction layer such that friction occurs between the intervening film layer and the second friction layer; alternatively, the intermediate film layer may be provided on an inner surface of the second friction layer facing the first friction layer so that friction occurs between the intermediate film layer and the first friction layer; alternatively, the intermediate film layer may be fixedly disposed between the first friction layer and the second friction layer, for example, two ends of the intermediate film layer are fixed on the housing, and the intermediate film layer is disposed between the first friction layer and the second friction layer, so that the intermediate film layer rubs against the two friction layers (i.e., the first friction layer and the second friction layer) respectively.

Alternatively, the friction generator in the present embodiment may also be a friction generator of a five-layer intervening electrode structure. Accordingly, the first friction layer 121 includes a first electrode 1211 and a first high polymer insulating layer 1212; the second friction layer includes a second electrode 1221 and a second high polymer insulating layer (not shown). Wherein the first high molecular polymer insulating layer 1212 is disposed on a side surface of the first electrode 1211 facing the second friction layer 122; the second high molecular polymer insulating layer is disposed on a side surface of the second electrode 1221 facing the first friction layer 121. And, an intermediate electrode layer (not shown in the figure) is further provided between the first high polymer insulating layer 1212 and the second high polymer insulating layer of the friction generator of the five-layer intermediate electrode structure. Wherein the intermediate electrode layer may be disposed on an inner surface of the first friction layer facing the second friction layer such that friction occurs between the intermediate electrode layer and the second friction layer; alternatively, the intermediate electrode layer may be provided on an inner surface of the second friction layer facing the first friction layer so that friction occurs between the intermediate electrode layer and the first friction layer; alternatively, the intermediate electrode layer may be fixedly disposed between the first friction layer and the second friction layer, for example, two ends of the intermediate electrode layer are fixed on the housing, and the intermediate electrode layer is disposed between the first friction layer and the second friction layer, so that the intermediate electrode layer rubs against the two friction layers (i.e., the first friction layer and the second friction layer) respectively. In the case of a triboelectric generator with an intermediate electrode structure, the first electrode, the second electrode and/or the intermediate electrode layer together form an electrical energy output. Specifically, the first electrode and the second electrode form a first group of output ends, the intermediate electrode layer forms a second group of output ends, and the first group of output ends and the second group of output ends are mutually connected in parallel or in series and then are jointly output, so that the sensitivity of the sensing unit can be improved.

In addition, in the friction generators of the above-described various structures, the first friction layer 121 refers to a friction layer inside each sensor unit. The first friction layer 121 inside each sensing unit may be a friction layer integrally provided on the inner surface of the hollow housing 110 so as to be covered by the second friction layer inside the sensing unit, or may be a friction layer partially intermittently provided on the inner surface of the hollow housing 110. When the latter is employed, the first friction layer 121 further includes: the specific number of the first sub-friction layers spaced apart from each other by a predetermined distance depends on the form of the entire friction generator, for example, each first sub-friction layer may include only one first electrode, may further include a first high polymer insulating layer, and may even further include a first intermediate film layer or a first intermediate electrode layer. The distance between the first sub-friction layers may be flexibly set by a person skilled in the art, and may be equal or unequal. When the first friction layer 121 is set to be a plurality of first sub-friction layers, the second friction layer 122 is rubbed with each first sub-friction layer, which is equivalent to splitting one friction generator into a plurality of sub-generators, and each sub-generator can be connected in series or in parallel, so that the flexibility and diversity of the airflow sensor can be further improved.

Here, it is to be noted that, in the implementation, one skilled in the art may use any of the friction generators described above as the sensing unit of the airflow sensor in the present invention, which is not limited thereto.

The sealing structure of the sensing unit 120 will be described in detail. The sensing unit 120 is sealed inside the hollow housing 110, and the sealing arrangement of the sensing unit 120 may be as follows: the friction layer in the sensing unit 120 is used as the sealing layer of the sensing unit 120 (for example, the second friction layer 122 in fig. 1a is used as the sealing layer), so that the friction effect of the friction layer in the sensing unit 120 is not affected by the other sealing layers (i.e., the sealing layers except the friction layer) when the friction layer is rubbed; in addition, because the air flow directly acts on the friction layer, the friction layer generates friction under the direct action of the air flow, so that an electric signal with larger intensity is generated and output, and the design of taking the friction layer as a closed layer can also effectively increase the output signal intensity of the sensing unit; meanwhile, the friction layer is used as a sealing layer to seal the sensing unit, so that the internal structure of the sensing unit 120 is isolated from the external environment, and the sensing unit is not affected by external factors such as moisture. The second friction layer 122 in each sensing unit 120 forms a closed sub-cavity with the inner wall of the hollow housing 110, and the first friction layer 121 in each sensing unit 120 is located inside the closed sub-cavity formed between the second friction layer in the sensing unit 120 and the inner wall of the hollow housing 110 (as shown in fig. 1 b). For a clearer illustration of the sealing structure of the sensing unit 120, please refer to the schematic structure of the airflow sensor shown in fig. 1 a. In fig. 1a, for ease of understanding, the second friction layer 122 of the sensing unit 120 further includes a sealing portion 1222 in addition to the second electrode 1221. In particular, the sealing portion 1222 may be a part of the second electrode 1221 for generating electricity by friction and outputting an electrical signal, and may be used together to seal the sensing unit 120 (i.e., the second friction layer is actually a whole, which is drawn separately in fig. 1a for ease of understanding, but it will be understood by those skilled in the art that in practice, the second electrode 1221 and the first sealing portion 1222 together form the second electrode in the second friction layer). It can be seen that the second electrode in this embodiment is directly used to seal the sensing unit in which it is located.

And the air with a certain amount of air is sealed in each sealed sub-cavity, so that the air pressure in each sealed sub-cavity is kept within a certain range, and the situation that extrusion and friction between the first friction layer and the second friction layer cannot be realized when the inside of the sealed sub-cavity is vacuum is prevented. In a specific implementation, the air pressure in each closed sub-cavity is at least maintained in the range of 0.3-0.7 standard atmospheric pressure. The air pressure in the closed sub-cavity is slightly smaller than the standard atmospheric pressure, so that mutual friction between the two friction layers is facilitated.

Wherein, in one air flow sensor, the number of the sensing units 120 is at least two (the number of the sensing units 120 shown in fig. 1a and 1b is four). The purpose of this arrangement is to effectively reduce the potential safety hazards in use caused by setting the number of sensing units 120 too single (for example, when only one sensing unit 120 is in the airflow sensor, if only the sensing unit 120 is damaged and not predicted in advance, the airflow sensor cannot be used normally), and to improve the sensitivity and accuracy of the output electrical signal.

In particular, in order to more clearly show the arrangement of the sensing units 120 in the hollow housing 110, fig. 2 a-2 c respectively show the inner wall deployment of the hollow housing 110 when different numbers of sensing units are arranged on the inner wall of the hollow housing 110. Wherein fig. 2a shows an expanded view of the inner wall of the hollow housing when two sensing units are arranged on the inner wall of the hollow housing; FIG. 2b shows an expanded view of the inner wall of the hollow housing when four sensing units are provided on the inner wall of the hollow housing; fig. 2c shows an expanded view of the inner wall of the hollow housing when eight sensor units are provided on the inner wall of the hollow housing. Here, it is to be noted that the arrangement of the sensing units shown in fig. 2a to 2c is merely exemplary, and the arrangement of the sensing units in the present invention includes, but is not limited to, the three cases shown above, and the number of the sensing units in each air flow sensor in the present invention is not limited to only the even number shown above, that is, the number of the sensing units may be three, five, or the like, and in any case, the number of the sensing units in each air flow sensor is not limited as long as it is ensured that the number of the sensing units in each air flow sensor is two or more.

Wherein, the first electrode 1211 is provided with a wire connected to the electrode, the second electrode 1221 is provided with a wire connected to the electrode, and the first electrode 1211 and the second electrode 1221 output an electric signal through the wire, so that the first electrode 1211 and the second electrode 1221 are commonly used as a signal output terminal of the air flow sensor.

The operation of the air flow sensor 100 will now be described, taking the air flow sensor shown in fig. 1a and 1b as an example. Specifically, when the air flow sensor is used, the user inhales or exhales, when the user inhales, an inhalation air flow is formed in the air flow channel shown in fig. 1a and 1b, the second electrode 1221 in the second friction layer 122 and the first high polymer layer 1212 in the first friction layer 121 are rubbed in contact under the action of the inhalation air flow to generate electrostatic charges, the generation of the electrostatic charges causes the first electrode 1211 and the second electrode 1221 to form induced charges, so that an electric field is formed between the first electrode 1211 and the second electrode 1221, and when the first electrode 1211 and the second electrode 1221 are communicated by an external circuit, an alternating current pulse electric signal is formed in the external circuit, and the inhalation air flow pressure electric signal generated by the friction is output; similarly, when the user exhales, an expiratory airflow is formed in the airflow channel shown in fig. 1a and 1b, at which time the first friction layer is separated from the second friction layer, and the first electrode 1211 and the second electrode 1221 output an expiratory airflow pressure electrical signal. Wherein the inspiratory flow pressure electrical signal is opposite to the expiratory flow pressure electrical signal. For example, if the inspiratory airflow pressure electrical signal is a positive airflow pressure electrical signal, the expiratory airflow pressure electrical signal is a negative airflow pressure electrical signal.

Therefore, the airflow sensor provided by the invention is realized by utilizing the friction power generation principle. The air flow sensor is provided with the dampproof structure, so that the sensitivity and the accuracy of a sensing unit in the air flow sensor are not influenced by external factors such as moisture, the air flow sensor has higher accuracy in working, and the potential safety hazard of the air flow sensor in use is reduced; meanwhile, the air flow sensor provided by the invention also simplifies the manufacturing process, reduces the production cost and brings convenience to industrial production and use for users.

Example two

Fig. 3 is a schematic cross-sectional view of an airflow sensor 300 according to a second embodiment of the invention. As shown in fig. 3, the airflow sensor 300 is different from the airflow sensor 100 of the first embodiment in that the second friction layer of the sensing unit 120 in the airflow sensor 300 further includes: and a sealing layer 1223, wherein the second electrode 1221 is disposed on an inner surface of the sealing layer 1223 adjacent to the first friction layer.

Specifically, in the airflow sensor 300, the second friction layer is an arched friction layer, and a gap is formed between the second friction layer and the first friction layer; alternatively, the second friction layer may be a friction layer having another structure such as a friction layer laminated with the first friction layer. When the second friction layer is an arched friction layer, the design mode of the arched friction layer is beneficial to ensuring effective separation between the two friction layers, so that the condition that the two friction layers cannot be effectively separated after being mutually contacted due to ageing of materials is prevented. The gap between the first friction layer and the second friction layer is preferably arranged in the middle of the second friction layer, so as to achieve the optimal friction effect. However, it is understood that the location of the gap may be at two ends of the second friction layer or other suitable locations, which is not limited by the present invention. The second electrode 1221 and the hermetic layer 1223 in the second friction layer are shown in fig. 3. As shown in fig. 3, a sealing layer 1223 is wrapped around the outer side of the second electrode 1221 of each sensing unit 120, for isolating each sensing unit 120 from the outside, respectively, and protecting the internal structure of the sensing unit 120 from external factors such as moisture; meanwhile, the sealing layer 1223 may further be used to support the second electrode 1221, so as to prevent situations such as incapacity of separation of the friction interface between the first friction layer and the second friction layer after contact (for example, incapacity of separation between the second electrode 1221 and the first polymer insulating layer 1212, thereby causing incapacity of effective friction between the second electrode 1221 and the first polymer insulating layer 1212 under the action of air flow), which is favorable for separation between the friction interfaces, thereby ensuring the friction effect. Accordingly, the sealing layer 1223 may also be referred to as a sealing support layer.

The other components of the airflow sensor in the second embodiment are the same as those of the first embodiment, and will not be described here again.

Example III

Fig. 4 shows a schematic structural diagram of an airflow sensor 400 according to a third embodiment of the present invention. As shown in fig. 4, the airflow sensor 400 includes: a hollow case 410, at least two sensing units (not shown in the drawings) disposed inside the hollow case 410, and a communication sealing layer 420. The hollow housing 410 is configured in the same manner as the hollow housing 110 in the first embodiment, and will not be described herein. The sensing unit and the communication sealing layer 420 will be described in detail.

Specifically, the sensing unit in the third embodiment is different from the sensing unit 120 in the first embodiment in that, unlike the manner in which the inside of each sensing unit is individually sealed in the first embodiment, in each sensing unit in the third embodiment, the second friction layer serves as and only serves as the friction layer of the sensing unit, and each sensing unit is sealed by the communication sealing layer 420. In addition, other arrangement manners of the sensing units in the third embodiment are the same as those of the sensing units in the first embodiment, and will not be described herein.

Specifically, as shown in fig. 4, the communication sealing layer 420 is specifically disposed inside the hollow housing 410 of the airflow sensor 400, so as to form a communication type sealed cavity with the inner wall of the hollow housing 410, and each sensing unit is disposed inside the communication type sealed cavity. The sensing unit in the air flow sensor 400 is disposed between the inner walls of the hollow case 410 and sealed by the communication sealing layer 420 forming a communication type sealed cavity. Wherein, the shape of the communication sealing layer 420 matches with that of the hollow shell 410, the interior of the hollow shell 410 forms an air flow channel, and the air directly acts on the communication sealing layer 420 when passing through the air flow channel, so that the first friction layer and the second friction layer sealed in the communication sealing layer 420 rub against each other, thereby generating and outputting corresponding electric signals. Specifically, the working principle of generating and outputting the corresponding electrical signal is the same as that of the airflow sensor 100 in the first embodiment of the present invention, and will not be described herein.

Further, in order to achieve a better sensing effect of the air flow sensor, the air flow sensor can adopt the following two improvements.

In an optional improvement, a first end cover and a second end cover are respectively arranged at two ends of the hollow shell of the airflow sensor, at least one air inlet hole is arranged on the first end cover, at least one air outlet hole is arranged on the second end cover, and the first end cover, the air inlet hole on the first end cover, the second end cover and the air outlet hole on the second end cover are used for enabling inflow air to form vortex air in the airflow channel. Wherein, the air flow channel is formed at the position of the hollow shell where the sensing unit is not arranged. Specifically, as shown in fig. 5, fig. 5 is a schematic structural diagram of an airflow sensor 500 modified by the modification of the first embodiment of the present invention. Wherein, compared to the air flow sensor 100 in the first embodiment, the air flow sensor 500 further includes: the first end cap 130 and the second end cap 140 are respectively disposed at two ends of the hollow housing 110, and the first end cap 130 and the second end cap 140 are respectively matched with the front and rear bottom surfaces of the hollow housing 110 in shape, and can be assembled with the hollow housing 110 into a whole by a mechanical assembly mode such as a buckle or a glue. In addition, at least one air inlet hole 131 for allowing air to flow in is formed in the first end cover 130, at least one air outlet hole 141 for allowing air to flow out is formed in the second end cover 140, and during the process that air flows into the air flow channel through the air inlet hole 131 and flows out from the air outlet hole 141 through the air flow channel, the air inlet hole 131 in the first end cover 130 and the air outlet hole 141 in the second end cover 140 enable the inflow air to form vortex air in the air flow channel, and the vortex air enables the first friction layer 121 to contact and rub with the second friction layer 122, so that an electric signal is generated and output. The specific number and arrangement of the air inlet holes 131 and the air outlet holes 141 may be set by those skilled in the art according to actual situations, which is not limited by the present invention.

It should be understood that the above modifications of the first end cap and the second end cap may be applied to not only the first embodiment of the present invention but also the second embodiment or the third embodiment of the present invention, and those skilled in the art may select the modifications as needed, which is not limited herein.

In a further alternative development, at least one support element 150 is provided on at least one of the two friction interfaces formed by the first friction layer and the second friction layer. Wherein, optionally, the at least one supporting component 150 is disposed at two ends and/or middle of the friction interface, and the at least one supporting component comprises: shims and/or springs. Specifically, the position of the support member 150 may be set in the following manner: the support member 150 is disposed in the middle of the first and second friction layers near at least one side of the first and second end caps in the radial direction, respectively; and/or the support member 150 is disposed on at least one of the two axial sides of the friction layer adjacent to at least one side of the first and second end caps, respectively, of the first and second friction layers. Wherein, at least one supporting member is preferably disposed at the middle of the friction interface to achieve a better friction effect, and the number of supporting members 150 may be one or more in each sensing unit, which is not limited in the present invention.

By way of example, fig. 6a and 6b show an alternative arrangement of the invention with respect to the support member 150. Wherein, as shown in fig. 6a, the developed view of the friction interface where the support member 150 is located is rectangular, and the support members 260 are disposed at four corners of the friction interface, wherein the number of the support members 150 in the sensing unit is 4; as shown in fig. 6b, the developed view of the friction interface where the support member 150 is located in fig. 6b is rectangular, and the support member 150 is disposed in the middle of the friction interface where it is located, wherein the number of support members 150 in the sensing unit is 2. Here, it is to be noted that the above-listed examples are merely illustrative, and the arrangement form and number of the support members 150 include, but are not limited to, the above-listed examples, and for example, the number of the support members 150 in each sensor unit may be 1, 3, or the like. In specific implementation, the specific arrangement form and the number of the support members 150 may be set by those skilled in the art according to actual circumstances, which is not limited by the present invention.

The arrangement of the supporting member 150 can effectively prevent the occurrence of unnecessary adhesion between two friction layers or the occurrence of the situation of incapability of separation and the like, and is favorable to the separation between friction interfaces, thereby ensuring the friction effect.

For the sake of clarity of the present improvement, please refer to the two illustrations (fig. 7 and 8) given below for ease of understanding. Fig. 7 is a schematic structural diagram of an airflow sensor 700 modified by the modification of the first embodiment of the present invention. Fig. 8 is a schematic structural diagram of an airflow sensor 800 modified in the modification of the second embodiment of the present invention. In fig. 7 and 8, the support member 150 is disposed on the first high polymer insulating layer 1212 of the first friction layer, at a middle portion of the first high polymer insulating layer 1212 on the first friction layer. In addition, although the supporting member 150 is provided on the first friction layer in the example given in fig. 7 and 8, it is understood that the supporting member 150 is not limited to the above case of being provided only on the first friction layer in the specific implementation, and the supporting member 150 may be provided on the second friction layer. Here, the supporting member 150 may be provided on the inner surface of at least one friction layer (may also be provided on the inner surfaces of both friction layers) according to the actual situation by those skilled in the art, as long as it is effective to prevent the occurrence of unnecessary adhesion between the two friction layers or the occurrence of inseparable or the like, which is not limited thereto.

It should be understood that the above modification of the support structure 150 may be applied not only to the first embodiment of the present invention, but also to the second or third embodiment of the present invention, and those skilled in the art may select the modification as needed, which is not limited herein.

Here, it is to be noted that the above two modifications may be used alone or in combination. In specific implementations, one skilled in the art may choose one or both of the above modifications according to the actual situation, which is not limited herein.

Finally, an atomizer made based on the airflow sensor provided in any of the embodiments described above is described. Fig. 9a and 9b are schematic views of a nebulizer according to yet another embodiment of the invention. Fig. 9a is a functional block diagram of an atomizer according to a fourth embodiment of the present invention, and fig. 9b is a schematic structural diagram of an atomizer according to a fourth embodiment of the present invention. As shown in fig. 9a and 9b, the atomizer comprises: a reservoir component 910, a nozzle airflow monitoring component 920, and an atomizer body 930. The liquid storage component 910 is disposed on the atomizer main body 930 and is connected to the atomizer main body 930, specifically, the liquid storage component 910 is connected to the atomizer main body 930 in a sealing manner, and is used for storing the liquid medicine to be atomized and sprayed; the nozzle airflow monitoring part 920 is disposed on the liquid storage part 910, and connected to the liquid storage part 910, and is configured to output an airflow pressure electric signal according to an airflow generated by inhalation or exhalation of a user, and spray the atomized liquid medicine through the atomizer body 930 into the mouth and nose of the user; the atomizer body 930 is electrically connected to the nozzle air flow monitor 920, and is used for spraying the atomized liquid medicine stored in the liquid storage part 910 and processing the air flow pressure electric signal outputted from the air flow sensor in the nozzle air flow monitor 920.

Optionally, the liquid storage part 910 includes: a cover body and a containing cavity. Specifically, the lid is flip-type connection with holding the cavity, and the lid can be opened or closed, is provided with buckle mechanism on the lid, and buckle mechanism is used for making the lid and holds the sealed lock of cavity. When adding or pouring out the liquid medicine, only the buckling mechanism on the cover body is required to be opened, so that the cover body can be opened; when the liquid medicine is not added or poured, the buckling mechanism on the cover body is only required to be closed, so that the cover body can be closed and buckled with the accommodating cavity in a sealing way. The holding cavity is used for storing the liquid medicine to be atomized and sprayed, an atomization port and a liquid outlet are arranged on the holding cavity, the atomization port is connected with the atomizer main body 930, and the liquid outlet is connected with the nozzle airflow monitoring component 920. The atomizer body 930 atomizes the medicine liquid stored in the accommodating cavity through the atomizing port on the accommodating cavity, and sprays the medicine liquid into the nozzle airflow monitoring part 920 through the liquid outlet on the accommodating cavity, and then sprays the medicine liquid into the mouth and nose of a user.

Taking the atomizer body 930 as an example of a compressed air atomizer, a schematic structure of the liquid storage part can be shown in fig. 9c, and in combination with fig. 9b and 9c, the liquid storage part 910 includes a cover body 911 and a receiving cavity 912. Wherein, the middle part of the bottom surface of the accommodating cavity 912 is provided with an atomization port 913, and the atomization port 913 is respectively connected with the atomizer main body 930 and the airflow channel 914; a liquid outlet 915 is provided in the upper portion of the side wall of the receiving cavity 912, the liquid outlet 915 being connected to the nozzle flow monitoring member 920. A pipette 916 is disposed within receiving cavity 912 adjacent to air flow channel 914 and a barrier 917 is also disposed adjacent to the air outlet of air flow channel 914. The liquid suction pipe 916 is used for sucking the liquid medicine stored in the accommodating cavity 912, the compressed air generated by the atomizer body 930 flows in from the atomizing port 913 and flows into the accommodating cavity 912 through the air flow channel 914, the compressed air forms high-speed air flow when passing through the fine air outlet of the air flow channel 914, the generated negative pressure drives the liquid medicine in the liquid suction pipe 916 to be sprayed onto the barrier 917 together, and the liquid medicine is splashed to the periphery under high-speed impact to change liquid drops into mist particles to be sprayed out from the liquid outlet 915.

Optionally, the nozzle airflow monitoring component 920 includes: a nozzle body (not shown) and an air flow sensor (not shown). Wherein, the nozzle body is disposed on the liquid storage component 910, and is connected with the liquid storage component 910, and the nozzle body may adopt an atomizer nozzle in the prior art, for example: the nozzle with a cylindrical structure as shown in fig. 9b can be selected by those skilled in the art according to actual needs, and is not limited herein; the airflow sensor is arranged in the nozzle body and is used for converting the pressure of the airflow generated by inhalation or exhalation of a user on the airflow sensor into an airflow pressure electric signal and outputting the airflow pressure electric signal.

The air flow sensor is specifically any one of the air flow sensors described in the above-described first to sixth embodiments. In specific implementations, one skilled in the art may select one or more of the airflow sensors shown in the first to sixth embodiments according to the needs of the actual situation, and the present invention is not limited thereto.

In addition, one air flow sensor or a plurality of air flow sensors may be provided in the nozzle body. The air flow sensor arranged in the nozzle body has the advantages of simple structure, easy realization and more simplicity in structure of the atomizer; the air flow sensor has the advantages that the air flow sensor can sense the pressure of air flow generated by inhalation or exhalation of a user acting on the air flow sensor in different directions, so that the atomizer is more sensitive and the monitoring result is more accurate.

When an airflow sensor is disposed in the nozzle body, the airflow sensor is electrically connected to the atomizer main body 930, and a plurality of airflow pressure electrical signals output by the airflow sensor are preprocessed by the atomizer main body 930 and then analyzed and calculated to obtain information such as atomized airflow information; when a plurality of air flow sensors are disposed in the nozzle body, the air flow sensors may be electrically connected to the atomizer main body 930, and a plurality of air flow pressure electrical signals output by the air flow sensors are analyzed and calculated to obtain information such as atomized air flow information after being preprocessed by the atomizer main body 930. Here, when a plurality of air flow sensors are provided inside the nozzle body, those skilled in the art may provide connection relations between the plurality of air flow sensors and the atomizer body 930 according to actual situations, and the present invention is not limited thereto.

Further, when a plurality of air flow sensors are provided in the interior of the nozzle body, the plurality of air flow sensors may be provided in the interior of the nozzle body in a longitudinally overlapping manner along the longitudinal direction of the nozzle body; alternatively, a plurality of air flow sensors may be disposed within the nozzle body in a lateral direction of the nozzle body, in a tangential arrangement, or in other types of arrangements. Here, when a plurality of air flow sensors are provided in the nozzle body, a person skilled in the art may set the arrangement of the plurality of air flow sensors provided in the nozzle body according to the actual situation, which is not limited in the present invention.

Optionally, the atomizer body 930 further comprises: a plurality of signal preprocessing modules 931 and a central control module 932. Wherein, a plurality of signal preprocessing modules 931 are respectively and electrically connected with each sensing unit in the air flow sensor in the nozzle air flow monitoring component 920 and are used for respectively preprocessing each air flow pressure electric signal corresponding to each sensing unit; the central control module 932 is electrically connected to the plurality of signal preprocessing modules 931, and is configured to extract an airflow pressure electrical signal with a signal value greater than a preset threshold value from the preprocessed plurality of airflow pressure electrical signals, and calculate atomized airflow information according to the airflow pressure electrical signal with the signal value greater than the preset threshold value.

Further, as shown in fig. 9d, the signal preprocessing module 931 may include: a rectification module 9311, a filtering module 9312, an amplifying module 9313 and an analog-to-digital conversion module 9314. The rectification module 9311 is electrically connected to the airflow sensor in the nozzle airflow monitoring component 920, and is configured to rectify the airflow pressure electrical signal output by the airflow sensor; the filtering module 9312 is electrically connected to the rectifying module 9311, and is configured to perform filtering processing on the rectified airflow pressure electrical signal to filter out interference clutter; the amplifying module 9313 is electrically connected to the filtering module 9312 and is configured to amplify the airflow pressure electrical signal after the filtering process; the analog-to-digital conversion module 9314 is electrically connected to the amplifying module 9313, and is configured to convert the analog airflow pressure electrical signal output by the amplifying module 9313 into a digital airflow pressure electrical signal, and output the converted digital airflow pressure electrical signal to the central control module 932. It should be noted that the above modules (i.e., the rectifying module 9311, the filtering module 9312, the amplifying module 9313, and the analog-to-digital conversion module 9314) may be selected according to the needs of those skilled in the art, and are not limited herein. For example, the rectification module 9311 may be omitted if the airflow pressure electrical signal output from the airflow sensor in the nozzle airflow monitoring section 920 does not need to be rectified.

Further, the airflow sensor in nozzle airflow monitoring component 920 can distinguish between airflow pressure electrical signals resulting from pressure conversion of the airflow generated by the user's inhalation or exhalation acting on it. Specifically, the airflow sensor in nozzle airflow monitoring component 920 is further configured to: converting the pressure of the air flow generated by the inhalation of the user on the air flow sensor into an inhalation air flow pressure electric signal and outputting the inhalation air flow pressure electric signal; the pressure of the airflow generated by the user exhaling on the airflow sensor is converted into an expiratory airflow pressure electric signal to be output. For example, the inspiratory airflow pressure electrical signal is a positive airflow pressure electrical signal and the expiratory airflow pressure electrical signal is a negative airflow pressure electrical signal. In this case, the signal preprocessing module 931 is further configured to: the inspiration air flow pressure electric signal and the expiration air flow pressure electric signal output by the air flow sensor are preprocessed.

The central control module 932 is specifically configured to: and calculating atomization airflow information according to the maximum value and/or the average value corresponding to the airflow pressure electric signal with the signal value larger than the preset threshold value.

The preset threshold is set according to a voltage threshold range when the plurality of sensing units do not work. In a specific implementation, the preset threshold may be set by a person skilled in the art according to practical situations, for example, if the threshold range of the non-operating voltages of the plurality of sensing units is 0-10mV, the preset threshold is set to 10mV. When calculating the atomized airflow information, the central control module firstly receives signal values of a plurality of inspiration or expiration airflow pressure electric signals sent by each sensing unit in the airflow sensor, then analyzes and calculates peak values in the plurality of inspiration or expiration airflow pressure electric signals sent by each sensing unit (namely, maximum values in the plurality of inspiration or expiration airflow pressure electric signals sent by each sensing unit), and takes the peak values as signal values corresponding to the sensing units. Then further judging whether each signal value is larger than the preset threshold value, if not, indicating that the sensing unit is in an abnormal working state, namely that the sensing unit is damaged, and automatically counting by 1 in the abnormal working state counting; if the judgment result is yes, the state of normal working with the sensing unit is indicated, namely the sensing unit is not damaged, and counting in an abnormal working state is not needed. After the judgment of each signal value is completed, the final abnormal operation state count total number is acquired as a count result.

In an alternative scheme, the central control module calculates atomized air flow information according to the maximum value corresponding to the air flow pressure electric signal with the signal value larger than the preset threshold value. Specifically, the central control module is provided with a preset value, which is set by a person skilled in the art according to the actual situation, and may be set to half the total number of sensing units, for example. In the scheme, after the counting process is completed, the central control module further judges whether the counting result is smaller than the preset value, if so, the central control module further acquires the maximum value corresponding to the airflow pressure electric signal with the signal value larger than the preset threshold value as atomization airflow information; if the judgment result is negative, an alarm instruction is sent to the alarm module. The maximum value corresponding to the air flow pressure electric signal can reflect the air flow state of the optimal position of the air flow channel in the air flow sensor, and the mode can be adopted when a user focuses on the air flow state of the optimal position of the air flow channel.

In another alternative, the central control module calculates the atomizing airflow information according to an average value corresponding to the airflow pressure electrical signal with the signal value greater than the preset threshold value. Specifically, the central control module is provided with a preset value, which is set by a person skilled in the art according to the actual situation, and may be set to half the total number of sensing units, for example. In the scheme, after the counting process is completed, the central control module further judges whether the counting result is smaller than the preset value, if so, the central control module further acquires an average value corresponding to an air flow pressure electric signal with a signal value larger than a preset threshold value as atomization air flow information; if the judgment result is negative, an alarm instruction is sent to the alarm module. The average value corresponding to the air flow pressure electric signal can reflect the average air flow state of each part of the air flow channel in the air flow sensor, and the mode can be adopted when a user focuses on the average air flow state of each part of the air flow channel.

Optionally, fig. 9e is a schematic functional structure of another atomizer provided in this embodiment. Specifically, compared to the atomizer shown in fig. 9a, the atomizer body shown in fig. 9e further comprises: an alarm module 940. The alarm module 940 is connected to the central control module 932, and is configured to generate a fault alarm signal when the number of airflow pressure electrical signals extracted by the central control module 932 is greater than a preset threshold value and less than a preset value.

Specifically, after the central control module 932 calculates the atomized airflow information, the central control module 932 further determines whether the number of the airflow pressure electric signals with the extracted signal value being greater than the preset threshold value is smaller than the preset value, if yes, the central control module 932 sends an alarm instruction to the alarm module 940, and the alarm module 940 generates a fault alarm signal after receiving the alarm instruction, so as to remind a user or medical staff of potential safety hazards of the atomizer, and inform the user or medical staff that the sensing unit of the airflow sensor in the atomizer is damaged, and the damaged airflow sensor or atomizer should be replaced in time. The fault alarm signal may be a fault alarm signal such as a voice signal, an indicator light signal, etc., which is not limited in the present invention.

Therefore, in the atomizer provided by the invention, the moisture-proof structure is arranged, the sensitivity and the accuracy of the sensing unit of the airflow sensor in the atomizer are not influenced by external factors such as moisture, so that the atomizer has higher accuracy in working, and the detection and the reminding can be carried out according to whether the sensing unit in the atomizer is damaged or not, so that the potential safety hazard existing in the use process of the atomizer is reduced; meanwhile, the atomizer provided by the invention also simplifies the manufacturing process, reduces the production cost, and brings convenience to industrial production and users.

Various modules and circuits mentioned in the present invention are all circuits implemented by hardware, and although some modules and circuits are integrated with software, the present invention is intended to protect hardware circuits integrating functions corresponding to the software, not just the software itself.

It should be appreciated by those skilled in the art that the device structures shown in the figures or embodiments are merely schematic and represent logical structures. Where the modules shown as separate components may or may not be physically separate, the components shown as modules may or may not be physical modules.

Finally, it should be noted that: the above description is only illustrative of the specific embodiments of the invention and it is of course possible for those skilled in the art to make modifications and variations to the invention, which are deemed to be within the scope of the invention as defined in the claims and their equivalents.

Claims

1. An airflow sensor, comprising: a hollow housing, at least two sensing units disposed inside the hollow housing, wherein,

each sensing unit comprises a first friction layer and a second friction layer; the first friction layer is fixed on the inner wall of the hollow shell, and the second friction layer is arranged opposite to the first friction layer; and, a portion of the hollow housing inside which the sensing unit is not disposed forms an air flow passage, and an air flow inside the air flow passage acts on the second friction layer to cause the first and second friction layers to rub against each other;

the second friction layer is an arched friction layer, and a gap is formed between the middle part of the second friction layer and the first friction layer; the interiors of at least two sensing units form a closed space, and the closed space is not communicated with the airflow channel;

The first friction layer comprises a first electrode, the second friction layer comprises a second electrode, a first high-molecular polymer insulating layer is further arranged on the side surface of the first electrode facing the second friction layer, and/or a second high-molecular polymer insulating layer is further arranged on the side surface of the second electrode facing the first friction layer; the first electrode and the second electrode are used together as a signal output end of the airflow sensor.

2. The air flow sensor according to claim 1, wherein a closed sub-cavity is formed between the second friction layer in each sensing unit and the inner wall of the hollow housing, and the first friction layer in each sensing unit is located inside the closed sub-cavity formed between the second friction layer in the sensing unit and the inner wall of the hollow housing.

3. The air flow sensor of claim 2, wherein the second friction layer further comprises: and the second electrode is arranged on the inner surface of the sealing layer.

4. A gas flow sensor according to claim 2 or claim 3, wherein the gas pressure within each sealed subcavity is in the range 0.3 to 0.7 atmospheres gauge.

5. The air flow sensor according to claim 1, wherein the interior of the hollow housing is further provided with: and a communication airtight layer of a communication airtight cavity is formed between the sensing units and the inner wall of the hollow shell, and each sensing unit is arranged in the communication airtight cavity.

6. The air flow sensor according to claim 5, wherein the air pressure in the communicating type closed cavity is 0.3-0.7 standard atmospheric pressure.

7. An air flow sensor according to any of claims 1-3, 5-6, characterized in that at least one support member is arranged on at least one of the two friction interfaces formed by the first friction layer and the second friction layer.

8. The air flow sensor according to claim 7, wherein the at least one support member is provided at both ends and/or in the middle of the friction interface, and the at least one support member comprises: shims and/or springs.

9. The air flow sensor according to any one of claims 1-3, 5-6 and 8, wherein a first end cover and a second end cover are respectively arranged at two ends of the hollow shell, at least one air inlet hole is arranged on the first end cover, and at least one air outlet hole is arranged on the second end cover; the first end cover and the second end cover are used for enabling inflow gas to form vortex wind in the airflow channel;

And, the shape of the hollow housing includes at least one of: hollow cylindrical, hollow prismatic, hollow truncated cone, and hollow prismatic.

10. The air flow sensor of claim 1, wherein the first friction layer comprises: a plurality of first sub-friction layers spaced apart from each other by a predetermined distance.

11. The air flow sensor according to claim 1, wherein when a first high polymer insulating layer is further provided on a side surface of the first electrode facing the second friction layer, and a second high polymer insulating layer is further provided on a side surface of the second electrode facing the first friction layer, an intervening thin film layer or an intervening electrode layer is further provided between the first high polymer insulating layer and the second high polymer insulating layer.

12. An atomizer, comprising: a liquid storage part, a nozzle airflow monitoring part and an atomizer main body, wherein the airflow sensor as claimed in any one of claims 1 to 11 is arranged in the nozzle airflow monitoring part; wherein,,

the liquid storage component is connected with the atomizer main body and used for storing liquid medicine to be atomized and sprayed;

The nozzle airflow monitoring component is connected with the liquid storage component and is used for converting the sensed airflow into an airflow pressure electric signal by utilizing the airflow sensor and spraying the liquid medicine atomized by the atomizer main body into the mouth and the nose of a user;

the atomizer main body is electrically connected with the nozzle airflow monitoring component, and is used for spraying the liquid medicine stored in the liquid storage component after atomizing and processing airflow pressure electric signals output by the airflow sensor in the nozzle airflow monitoring component.

13. The atomizer according to claim 12, wherein the number of the air flow pressure electric signals outputted from the air flow sensor in the nozzle air flow monitoring part is plural, and each air flow pressure electric signal corresponds to each sensing unit in the air flow sensor one by one;

the atomizer body further comprises:

the signal preprocessing modules are respectively and electrically connected with each sensing unit in the airflow sensor and are used for respectively preprocessing each airflow pressure electric signal corresponding to each sensing unit;

the central control module is electrically connected with the plurality of signal preprocessing modules and is used for extracting airflow pressure electric signals with signal values larger than a preset threshold value from the preprocessed plurality of airflow pressure electric signals and calculating atomization airflow information according to the airflow pressure electric signals with the signal values larger than the preset threshold value.

14. The nebulizer of claim 13, wherein the central control module is specifically configured to: and calculating atomization airflow information according to the maximum value and/or the average value corresponding to the airflow pressure electric signal of which the signal value is larger than a preset threshold value.

15. A nebulizer as claimed in claim 13 or 14, wherein the nebulizer body further comprises:

and the alarm module is connected with the central control module and is used for generating a fault alarm signal when the number of the airflow pressure electric signals, of which the signal values extracted by the central control module are larger than a preset threshold value, is smaller than the preset value.