CN213961797U

CN213961797U - Electron cigarette miaow head based on resistance is met an emergency

Info

Publication number: CN213961797U
Application number: CN202022380705.4U
Authority: CN
Inventors: 胥海洲; 孙李麒
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-10-23
Filing date: 2020-10-23
Publication date: 2021-08-17
Anticipated expiration: 2030-10-23

Abstract

The utility model provides an electron cigarette miaow head based on resistance is met an emergency, follow supreme support, stainless steel gasket and the FPC mainboard that sets gradually down in casing and the casing, open the bottom of casing has the gas pocket, be equipped with the gasket through-hole on the stainless steel gasket, be equipped with the bars of meeting an emergency on the FPC mainboard, the bars of meeting an emergency are located gasket through-hole department. Compared with the prior art, the utility model has the advantages that: 1. the electronic cigarette microphone adopting the strain resistance scheme has a simple structure and low material cost; 2. the strain resistor is not sensitive to the smoke oil, when the smoke oil leaks, false triggering cannot occur, and the reliability is high; 3. the deformation amount of the FPC mainboard can be accurately detected, and the electronic cigarette can be conveniently controlled.

Description

Electron cigarette miaow head based on resistance is met an emergency

Technical Field

The utility model relates to an electron cigarette field especially relates to an electron cigarette miaow head based on resistance meets an emergency.

Background

The electronic cigarette is a fashionable scientific and technological new product generated along with the scientific and technological progress and the improvement of living standard of people, has various tastes and mouthfeel which are not possessed by common real cigarettes, and along with the development and popularization of the electronic cigarette, the electronic cigarette becomes a culture.

The principle of traditional electron cigarette miaow head adopts polarization membrane and electrode constitution electric capacity, the inside air of electron cigarette forms the negative pressure during smoking, the pressure differential of air promotes polarization membrane and metal casing and is close to, thereby cause the capacitance value change, detection circuitry controls the heater strip of lighting through detecting capacitance value change, its structural design is complicated, the material is with high costs, and after the tobacco tar takes place to leak when the long-time back that uses of electron cigarette, the tobacco tar produces the pollution to polarization membrane, influence the capacitance value change, take place the spurious triggering easily and cause the dangerous accident.

This scheme is through soft FPC embeds pressure sensor, and the FPC deformation size that detects through pressure sensor obtains the change size of the inside air pressure of electron cigarette, compares with predetermineeing the pressure threshold with the pressure size that detects, and the heater strip is lighted in the control of result of comparison, and structural assembly is simple, and material cost reduces.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem that the capacitive electronic cigarette microphone that above-mentioned background art exists is high in cost, and receives the tobacco tar influence easily, provide an electronic cigarette microphone based on resistance strain, through the strain resistance that integrates on the FPC board, detect FPC deformation size through strain resistance to acquire the technical scheme of some cigarette signals.

An electronic cigarette microphone based on resistance strain, comprising: the casing and the support, stainless steel gasket and the FPC mainboard that set gradually from supreme down in the casing, open the bottom of casing has the gas pocket, be equipped with the gasket through-hole on the stainless steel gasket, be equipped with the grid of meeting an emergency on the FPC mainboard, the grid of meeting an emergency is located gasket through-hole department.

Preferably, the strain grid is composed of a first strain resistor R1, a second strain resistor R2, a third strain resistor R3 and a fourth strain resistor R4, the resistance values of the first strain resistor R1, the second strain resistor R2, the third strain resistor R3 and the fourth strain resistor R4 are the same, and the first strain resistor R1 and the fourth strain resistor R4 are located at the gasket through hole.

Preferably, the FPC main board is provided with a vent hole.

Preferably, the first strain resistor R1, the second strain resistor R2, the third strain resistor R3 and the fourth strain resistor R4 are made of constantan wire.

Preferably, the stainless steel gasket and the FPC main board are connected by using back glue.

Compared with the prior art, the utility model has the advantages that: 1. the electronic cigarette microphone adopting the strain resistance scheme has a simple structure and low material cost; 2. the strain resistor is not sensitive to the smoke oil, when the smoke oil leaks, false triggering cannot occur, and the reliability is high; 3. the deformation amount of the FPC mainboard can be accurately detected, and the electronic cigarette can be conveniently controlled.

Drawings

Fig. 1 is a schematic structural view of the electronic cigarette microphone of the present invention;

fig. 2 is a cross-sectional view of the electronic cigarette microphone of the present invention;

fig. 3 is a schematic structural view of a strain gauge of the electronic cigarette microphone of the present invention;

fig. 4 is a schematic structural view of the FPC motherboard of the electronic cigarette microphone of the present invention;

fig. 5 is a schematic circuit diagram of the strain grating of the electronic cigarette microphone of the present invention;

fig. 6 is the utility model discloses electron cigarette miaow head strain measurement circuit schematic diagram.

In the figure: 1. a housing; 11. air holes; 2. a support; 3. stainless steel gasket, 31, gasket through hole; 4. an FPC main board; 41. and (4) a vent hole.

Detailed Description

In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

Referring to fig. 1 and 2, an electronic cigarette microphone based on resistance strain comprises a shell 1 and a shell 1, wherein the shell 1 is internally provided with a support 2, a stainless steel gasket 3 and an FPC (flexible printed circuit) mainboard 4 which are sequentially arranged from bottom to top, an air hole 11 is formed in the bottom of the shell 1 and used for generating air flow through smoking actions, a gasket through hole 31 is formed in the stainless steel gasket 3, a strain grid is arranged on the FPC mainboard 4 and located at the gasket through hole 31, negative pressure is formed in air inside the electronic cigarette during smoking, the FPC mainboard 4 deforms due to the pressure of the air, and therefore the resistance value of the strain grid changes, and a control chip judges whether smoking actions exist or not through detecting a resistance value change signal of the strain grid. The strain grid is composed of a first strain resistor R1, a second strain resistor R2, a third strain resistor R3 and a fourth strain resistor R4, the four strain resistors form a Wheatstone full-bridge circuit, and when the FPC board 4 does not deform, the resistance values of the four strain resistors R1, R2, R3 and R4 are equal.

Referring to fig. 3, for the specific structural design of the strain gate, the second strain resistor R2 and the third strain resistor R3 are implemented by winding, so that the influence caused by temperature change can be counteracted, and meanwhile, two resistor devices can be reduced, the first strain resistor R1 and the fourth strain resistor R4 are symmetrically designed, so that the size of an output strain value is improved, the four strain resistors are formed by routing wires on the FPC main board by constantan wires or other sensitive materials, and are integrated with the FPC main board, so that the size is small, and components are saved.

As shown in fig. 4, which is a position diagram of the strain gauge on the FPC motherboard 4, the FPC motherboard 4 is connected to the stainless steel gasket 3 by a back adhesive or other glue, the gasket through hole 31 on the stainless steel gasket 3 corresponds to a dotted line on fig. 4, the first strain resistor R1 and the fourth strain resistor R4 are located in the gasket through hole 31 (inside a dotted line frame in fig. 4), and the second strain resistor R2 and the third strain resistor R3 are located outside the dotted line frame. When the air pressure on the two sides of the FPC main board 4 changes, the deformation of the FPC part reinforced by the stainless steel gasket 3 (the second strain resistor R2 and the third strain resistor R3) is very small, namely the deformation is very small; the first strain resistor R1 and the fourth strain resistor R4 in the gasket via hole 31 will deform relatively much, so the sensitivity of the strain gate will be high.

As shown in fig. 5, which is a circuit connection diagram of the strain gauge, when the strain gauge is deformed, the resistance change values of the four strain resistors are Δ R1, Δ R2, Δ R3, and Δ R4, respectively, and then the output voltage is:

in the formula: u. of₀Input voltage of Wheatstone full bridge, u_iIs the output voltage. If the sensitivity coefficients of the four strain resistors are all K, that is

The output voltage is then:

in the formula: epsilon₁、ε₂、ε₃、ε₄The strain values sensed by the strain resistors R1, R2, R3 and R4 are respectively. The output strain of the strain gate becomes:

when the smoking action does not occur, R1/R2/R3/R4 are all equal, and ε d is 0; when smoking happens, because the second strain resistor R2 and the third strain resistor R3 are tightly attached to the stainless steel sheet, the pressure difference of the air pressure can only cause extremely weak changes to R2 and R3, and we assume that R2 and R3 do not change. Then:

Δε_d＝Δε₁+Δε₄ (4)

in the case of strain gauge design, where R1 and R4 need to be in the through hole region of the stainless steel shim, without support from the stainless steel shim, the R1 and R4 deformations will be large relative to R2 and R3, and always be both positive or both negative, so that Δ ∈ is achieved_dAs large as possible. By the formula (3) and the detected output voltage ui, Δ ∈ can be easily calculated_dThe value of (c).

The center of the dotted line frame of the FPC mainboard 4 is provided with a vent hole 41, when the air pressure difference between the inside and the outside of the electronic cigarette microphone is overlarge, partial air can penetrate through the vent hole, and therefore the effect of protecting the FPC mainboard is achieved.

The working process is as follows: when a user smokes the electronic cigarette, negative pressure is formed in the air inside the electronic cigarette, pressure difference is generated on two sides of the FPC main board 4 in the negative pressure electronic cigarette microphone of the air, so that the FPC main board 4 deforms, and the strain resistors R1, R2, R3 and R4 on the strain grids generate resistance change, referring to fig. 6, the output voltage of the strain grids is firstly amplified through a differential amplifier, then is input to a control chip after analog-to-digital conversion is carried out through an ADC (analog-to-digital converter), and the detected strain pressure is compared with a preset pressure threshold value through the control chip, so that the electronic cigarette is controlled to be started or stopped. Because the strain gate is sensitive to deformation and pressure corresponding to the deformation, the scheme can not only support the threshold to judge smoking actions, but also accurately judge the degree of suction, and is convenient for various corresponding operations, such as violent sucking, normal sucking, gentle sucking and the like. Due to the adoption of the method for monitoring the internal pressure change of the microphone by the FPC integrated strain resistor, the microphone is insensitive to the smoke, and when the smoke leaks, false triggering cannot occur, so that dangerous accidents are avoided.

It should be noted that the above wheatstone full-bridge strain grid design scheme is only one implementation of a strain grid, and may also adopt a wheatstone single bridge or a half bridge, or even may adopt a constant current source to supply power to directly test the change of a strain wire resistor, thereby obtaining pressure change data.

Claims

1. The utility model provides an electron cigarette miaow head based on resistance strain which characterized in that includes: support (2), stainless steel gasket (3) and FPC mainboard (4) that set gradually from supreme down in casing (1) and casing (1), open the bottom of casing (1) has gas pocket (11), be equipped with gasket through-hole (31) on stainless steel gasket (3), be equipped with the bars of meeting an emergency on FPC mainboard (4), the bars of meeting an emergency are located gasket through-hole (31) department.

2. A resistive strain based electronic vaping microphone according to claim 1, characterized in that the strain grid consists of a first strain resistor R1, a second strain resistor R2, a third strain resistor R3 and a fourth strain resistor R4, and the first strain resistor R1, the second strain resistor R2, the third strain resistor R3 and the fourth strain resistor R4 have the same resistance value, the first strain resistor R1 and the fourth strain resistor R4 are located at the pad via hole (31).

3. The electronic cigarette microphone based on resistance strain according to claim 1, wherein the FPC main board (4) is provided with a vent hole (41).

4. The electronic vaping microphone based on resistive strain of claim 2, wherein the first strain resistor R1, the second strain resistor R2, the third strain resistor R3 and the fourth strain resistor R4 are made of constantan wire.

5. The electronic cigarette microphone based on resistance strain of claim 1, wherein the stainless steel gasket (3) and the FPC board (4) are connected by using a back adhesive.