CN113647687A

CN113647687A - Differential pressure type electronic cigarette pressure sensor and electronic cigarette

Info

Publication number: CN113647687A
Application number: CN202111094339.9A
Authority: CN
Inventors: 黄高东; 石秀红
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-09-17
Filing date: 2021-09-17
Publication date: 2021-11-16

Abstract

The invention discloses a differential pressure type electronic cigarette pressure sensor and an electronic cigarette, comprising: a PCB board; the shell is arranged on the PCB, and the space between the shell and the PCB is divided into two air-through cavities; the chip is arranged on the PCB and positioned in the first cavity for processing air pressure data, and the first air pressure sensing element is used for detecting the external air pressure; and the second air pressure sensing element is arranged on the PCB and positioned in the second cavity and used for detecting the air pressure of the air sucked by the user. According to the electronic cigarette, the two air pressure sensing elements are integrated on the same air pressure sensor, the air pressure sensor is arranged in a double-cavity type, the two air pressure sensing elements are respectively positioned in different cavities, the external air pressure and the air pressure on the air suction channel can be compared in real time, so that an absolute pressure difference signal is generated, the air pressure detection precision is improved, accurate step output can be realized, the probability of false triggering is reduced, and the effective identification of the air suction pressure can be ensured when the electronic cigarette is used in a special low-pressure occasion.

Description

Differential pressure type electronic cigarette pressure sensor and electronic cigarette

Technical Field

The invention belongs to the field of electronic cigarette sensors, and particularly relates to a differential pressure type electronic cigarette pressure sensor and an electronic cigarette.

Background

The electronic cigarette is usually used by atomizing cigarette liquid through an atomizer, and substances such as tar and the like harmful to human bodies are removed when the cigarette liquid is manufactured, so that the harm to human bodies is eliminated. The existing electronic cigarette equipment is formed by fixedly connecting a battery pack, a core control assembly, an atomizer assembly and an air pressure sensor in sequence, wherein the air pressure sensor is an important element for detecting air pressure of the electronic cigarette, the detection accuracy of the existing air pressure sensor is insufficient, and particularly, errors are prone to occurring in a low-pressure environment.

Therefore, how to design an electronic cigarette pressure sensor capable of preventing oil and water is an urgent technical problem to be solved in the industry.

Disclosure of Invention

The invention provides a double-cavity oil-proof type air pressure sensor and an electronic cigarette, aiming at solving the technical problem that the detection precision of the electronic cigarette air pressure sensor in the prior art is not enough.

The technical scheme adopted by the invention is as follows:

the invention provides a differential pressure type electronic smoke pressure sensor, which comprises: a PCB board; the shell is arranged on the PCB, and the space between the shell and the PCB is divided into two air-through cavities; the chip is arranged on the PCB and positioned in the first cavity for processing air pressure data, and the first air pressure sensing element is used for detecting the external air pressure; and the second air pressure sensing element is arranged on the PCB and positioned in the second cavity and used for detecting the air pressure of the air sucked by the user.

Specifically, the chip judges whether the air pressure difference value between the second air pressure value detected by the second air pressure sensing element and the first air pressure value detected by the first air pressure sensing element is smaller than or equal to a first preset air pressure value, if so, the chip outputs a starting signal, and if not, the chip does not act or outputs an invalid starting signal.

And when the air pressure difference value is smaller than a first preset air pressure value, the chip outputs a suction force grade signal corresponding to a preset air pressure interval according to the preset air pressure interval where the air pressure difference value is located.

Furthermore, a first air vent is arranged at a position, corresponding to the first air pressure sensing element, on the shell, a second air vent is arranged at a position, corresponding to the first air pressure sensing element, of the shell, the first air vent is communicated with the outside through an air inlet channel of the electronic cigarette, a third air vent is arranged at a position, corresponding to the second air pressure sensing element, on the PCB, and the third air vent or the second air vent is communicated with an air suction channel of the electronic cigarette.

Preferably, the third ventilation hole is a suction hole communicated with a suction channel of the electronic cigarette, and the second ventilation hole is communicated with the outside through a suction channel of the electronic cigarette.

Preferably, the third ventilation hole is communicated with the outside through an air inlet channel of the electronic cigarette, and the second ventilation hole is a suction hole communicated with a suction channel of the electronic cigarette.

Preferably, the air pressure sensing element is any one of a capacitive MEMS sensor, a piezoelectric MEMS sensor, and a piezoresistive capacitive sensor.

Preferably, the chip is connected with the air pressure sensing element through a gold wire, and the surface of the chip is sealed.

Preferably, the side of the PCB board opposite to the shell is a plane and is provided with a patch pad.

Further, the air pressure sensing element is fixed on the PCB through silica gel, and the chip is fixed on the PCB through resin adhesive.

The invention further provides an electronic cigarette which comprises the air pressure sensor.

Compared with the prior art, the electronic cigarette has the advantages that the two air pressure sensing elements are integrated on the same air pressure sensor, the air pressure sensor is arranged in a double-cavity type, the two air pressure sensing elements are respectively positioned in different cavities, the external air pressure and the air pressure on the air suction channel can be compared in real time to obtain a pressure difference signal, the air pressure detection precision is improved, accurate stage output can be realized, the probability of false triggering is reduced, and the effective identification of the air suction pressure of a user can be ensured when the electronic cigarette is used in a special low-pressure occasion. And be convenient for accurate output ladder suction signal, make the function of electron cigarette more intelligent humanized, improve user experience.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a block diagram of an embodiment of the present invention;

FIG. 2 is a top view of the housing of the present invention;

FIG. 3 is a schematic cross-sectional view of an embodiment of the present invention;

1. a PCB board; 2. a chip; 31. a first pressure sensing element; 32. a second air pressure sensing element; 4. a housing; 5. a third vent hole; 6. a first vent hole; 7. a second vent hole; 8. a separator; 9. and a bonding pad.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

In the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The principles and construction of the present invention will be described in detail below with reference to the drawings and examples.

As shown in fig. 1 to 3, the present invention provides a differential pressure type electronic smoke pressure sensor, including: PCB board 1, separator 8, first air pressure sensitive component 31, second air pressure sensitive component 32, chip 2 and shell 4. The PCB board 1 is provided with a first air pressure sensing element 31, a second air pressure sensing element 32 and a chip 2, and the shell 4 is arranged on the PCB board 1 and covers the first air pressure sensing element 31, the second air pressure sensing element 32 and the chip 2 to form a cavity. The partition 8 is disposed in the housing 4 to separate the housing 4 into two air-tight cavities (the housing can be made by integral molding, i.e. the partition is a part of the housing, the partition of the housing can be installed by subsequent processing, and the specific embodiment is not limited), wherein the chip 2 for processing air pressure data and the first air pressure sensing element 31 are located in the first cavity, and the second air pressure sensing element 32 is separately located in the second cavity. Correspond first cavity and be equipped with first air vent 6 on the top surface of shell 4, correspond the second cavity and be equipped with second air vent 7 on the top surface of shell 4, correspond the position of second atmospheric pressure sensing element 32 on the PCB board 1 and be equipped with third air vent 5, wherein first air vent 6 communicates the external world through the inlet channel of electron cigarette (this passageway specifically through silica gel or the trachea subassembly on the electron cigarette), makes first atmospheric pressure sensing element 31 can respond to external atmospheric pressure. One of the second ventilation hole 7 and the third ventilation hole 5 is communicated with the air suction channel of the electronic cigarette, and the other one is communicated with the outside through the air inlet channel of the electronic cigarette, so that the second air pressure sensing element 32 can sense the negative pressure in the oral cavity of the user, namely the air suction pressure. According to the electronic cigarette, the two air pressure sensing elements are integrated on the same air pressure sensor, the air pressure sensor is arranged in a double-cavity type, the two air pressure sensing elements are respectively positioned in different cavities, when the electronic cigarette is used, the external air pressure and the air pressure on the air suction channel can be compared in real time to obtain a pressure difference signal, the air pressure detection precision is improved, accurate step output can be realized, the probability of false triggering is reduced, and when the electronic cigarette is used in a special low-pressure occasion, the effective identification of the air suction pressure can be guaranteed.

In a specific embodiment, the third ventilation hole 5 is a suction hole communicated with a suction channel of the electronic cigarette, and the second ventilation hole 7 is communicated with the outside through a suction channel of the electronic cigarette. In other embodiments, the third ventilation hole 5 may be communicated with the outside through an air inlet channel of the electronic cigarette, the second ventilation hole 7 is a suction hole communicated with an air suction channel of the electronic cigarette, and the installation direction of the air pressure sensing element needs to be adjusted to make the air suction sensing surface of the air pressure sensing element correspond to the suction hole.

The specific control judgment of the chip is as follows:

the second pressure sensing element 32 is used for detecting the air pressure of the user, and can send a second pressure value signal to the chip 2 (as for the specific principle process of converting the pressure signal into the electrical signal by the pressure sensing element, those skilled in the art know it and are not the key point of the present application, and therefore detailed description is not given here). The first air pressure sensing element 31 is used for detecting the air pressure of the cavity of the smoking set communicated with the outside, namely the standard air pressure, and can send a first air pressure value signal to the chip 2.

When a user inhales, whether the air pressure difference value between the second air pressure value and the first air pressure value (namely, the air pressure difference value is obtained by subtracting the first air pressure value from the second air pressure value) is smaller than or equal to a first preset air pressure value is judged through the chip 2, if yes, the suction force of the user using the electronic cigarette exceeds a preset starting air pressure value, and the chip 2 outputs a starting signal to a control component of the electronic cigarette to enable the electronic cigarette to be triggered; if not, the chip 2 does not act or outputs an invalid starting signal to prevent false triggering.

In order to realize the output of the step section, a plurality of sections of air pressure sections with gradually reduced range values can be preset, each section of preset air pressure section corresponds to one suction level signal, and when the air pressure difference value is located in the preset air pressure section, the chip 2 outputs the suction level signal corresponding to the preset air pressure section to the control chip 2 of the electronic cigarette.

Specifically, three ranges of values may be set to gradually decrease the air pressure, that is, a first air pressure range, a second air pressure range, and a third air pressure range. When the air pressure difference value reaches a first air pressure interval, a first suction signal is output, when the air pressure difference value reaches a second air pressure interval, a second suction signal is output, when the air pressure difference value reaches a third air pressure interval, a third suction signal is output, namely, the larger the suction generated when the user uses the vacuum suction device, the larger the suction signal corresponding to the suction is output. The electronic cigarette can make correct feedback according to the suction of the user, and user experience is improved.

The first preset air pressure value, the air pressure interval and the suction signal can be set according to actual design requirements, and for convenience of understanding, the scope and the value of the example are not limited to the protection scope of the present invention. The first preset air pressure value may be specifically set to-150 Pa (may be set to-120 Pa to-200 Pa), the air pressure interval may be a gradually decreasing air pressure interval such as-150 Pa to-250 Pa, -251Pa to 300Pa, and the output suction signal is a voltage signal.

The back surface of the PCB board 1 is flat, the surface mounting of the Surface Mounting Technology (SMT) can be realized by the aid of the surface mounting pads 99, the electronic cigarette is conveniently mounted on the integrated PCB board 1, and other components are integrated on the same PCB board 1 to realize all functions of the electronic cigarette.

In other embodiments, the PCB board 1 may be variably designed according to the shape of the housing 4, and may be formed in a rectangular shape (3.7 × 2.9 × 1.1 mm) or a circular shape.

The shell 4 is made of brass nickel plating material, can provide good physical protection and electromagnetic interference resistance, and is welded on the PCB board 1 by using solder paste, so that the air tightness is good. In addition, can paste dress dust screen on the air vent for it falls into inside the device to prevent that the particulate matter from via the inlet port, causes system function obstacle.

The chip 2 is fixed on the PCB board 1 by silica gel, and the air pressure sensing element is fixed on the PCB board 1 by resin adhesive. And the chip 2 realizes electric signal bridging with the air pressure sensing element through a gold wire, provides stable bias voltage for the air pressure sensing element, and processes air pressure data acquired by the air pressure sensing element. Meanwhile, the chip 2 is sealed by epoxy resin (black glue), so that liquid corrosion can be prevented, and the reliability is high.

In this embodiment, the two air pressure sensing elements both adopt MEMS silicon smoke sensors (specifically, capacitive MEMS sensors, piezoelectric MEMS sensors, or piezoresistive capacitance sensors). The capacitance type MEMS sensor, the piezoelectric type MEMS sensor or the piezoresistive type capacitance sensor adopts a silicon-based sensing chip generated by a micron-sized CMOS chip process, and has high consistency (a high-precision manufacturing process and uniform and stable bias voltage), small volume (0.95 x 0.5 mm) and high temperature resistance. Compared with the traditional PPS (polyphenylene sulfide) diaphragm, the capacitive MEMS sensor, the piezoelectric MEMS sensor or the piezoresistive capacitive sensor has the following remarkable advantages: the temperature drift is small, the temperature compensation algorithm is insensitive to temperature change, and the design of the temperature compensation algorithm is simple; secondly, a bias voltage circuit is designed, and the circuit enables the sensing membrane to be changed into a uniform charged state from a non-charged state, so that the consistency of the sensor is improved; the area of the sensing diaphragm is small, the diameter of the sensing diaphragm is 50um, and the diameter of the traditional diaphragm is 4.5 mm. The smaller the area of the diaphragm is, the smaller the deformation amount of the diaphragm is during vibration, impact and falling, and the bad phenomenon of false triggering can be reduced.

The invention further provides an electronic cigarette, which comprises the air pressure sensor.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A differential pressure electronic smoke pressure sensor, comprising: a PCB board; the shell is arranged on the PCB, and the space between the shell and the PCB is divided into two air-through cavities; the chip is arranged on the PCB and positioned in the first cavity for processing air pressure data, and the first air pressure sensing element is used for detecting the external air pressure; and the second air pressure sensing element is arranged on the PCB and positioned in the second cavity and used for detecting the air pressure of the air sucked by the user.

2. The differential pressure electronic smoke pressure sensor as claimed in claim 1, wherein said chip determines whether the air pressure difference between the second air pressure detected by the second air pressure sensing element and the first air pressure detected by the first air pressure sensing element is less than or equal to a first predetermined air pressure, if yes, said chip outputs a start signal, if no, said chip does not operate or outputs an invalid start signal.

3. The differential pressure electronic smoke pressure sensor as claimed in claim 2, wherein when the air pressure difference is smaller than a first predetermined air pressure, the chip outputs a suction level signal corresponding to a predetermined air pressure interval according to the predetermined air pressure interval in which the air pressure difference is located.

4. The differential pressure type electronic smoke pressure sensor according to claim 1, wherein a first vent hole is provided on the housing corresponding to the first pressure sensing element, a second vent hole is provided on the housing corresponding to the first pressure sensing element, the first vent hole is connected to the outside through the air inlet channel of the electronic cigarette, a third vent hole is provided on the PCB corresponding to the second pressure sensing element, and the third vent hole or the second vent hole is connected to the air inlet channel of the electronic cigarette.

5. The differential pressure type electronic cigarette pressure sensor according to claim 4, wherein the third vent is a suction hole communicated with a suction channel of the electronic cigarette, and the second vent is communicated with the outside through the suction channel of the electronic cigarette.

6. The differential pressure electronic smoke pressure sensor as claimed in claim 1, wherein said third vent is connected to the outside through the air intake channel of the electronic cigarette, and said second vent is the air intake hole of the air intake channel connected to the electronic cigarette.

7. The differential pressure electronic smoke pressure sensor according to claim 1, wherein said air pressure sensing element is any one of a capacitive MEMS sensor, a piezoelectric MEMS sensor and a piezoresistive capacitive sensor.

8. The differential pressure electronic smoke pressure sensor according to claim 1, wherein said chip and said pressure sensing element are connected to said PCB by gold wire.

9. The differential pressure electronic smoke pressure sensor as claimed in claim 1, wherein a side of said PCB board facing away from the housing is planar and is provided with a pad.

10. An electronic cigarette, characterized by comprising the air pressure sensor according to any one of claims 1 to 9.