CN206670696U - Gas flow sensor - Google Patents
Gas flow sensor Download PDFInfo
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- CN206670696U CN206670696U CN201720333615.5U CN201720333615U CN206670696U CN 206670696 U CN206670696 U CN 206670696U CN 201720333615 U CN201720333615 U CN 201720333615U CN 206670696 U CN206670696 U CN 206670696U
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- electrode
- macromolecule membrane
- vibrating diaphragm
- gas flow
- flow sensor
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Abstract
The utility model discloses a kind of gas flow sensor, including：Housing, and the electrode and the first macromolecule membrane of enclosure interior are arranged on, wherein, housing has the first end face and second end face being oppositely arranged, and offers at least one air admission hole in first end face, at least one venthole is offered in second end face；Gas channel is formed between electrode and the first macromolecule membrane；Central axial direction of the electrode along housing is set, and the first macromolecule membrane is the tubular film for being set in electrode exterior, and its shape matches with electrode shape, and at least one vibrating diaphragm is offered on the first macromolecule membrane；Wherein, each vibrating diaphragm there is the fixing end that is integrally connected with the first macromolecule membrane and can be under the drive of under test gas with electrode phase mutual friction free end.Gas flow sensor provided by the utility model solves the problems, such as that gas flow sensor output signal is less than normal in the prior art, sensitivity is relatively low and complex manufacturing technology, makes assembling simple, easily implements.
Description
Technical field
It the utility model is related to field of sensing technologies, more particularly to a kind of gas flow sensor.
Background technology
With raising of the development and people of science and technology to life requirement, multiple sides of the gas flow sensor in life
Face is applied, and the relevant informations such as the flow and flow rate of air-flow can be detected by pneumatic sensor.
But inventor has found during the utility model is realized, existing gas flow sensor is mostly work
Industry equipment, it is not only bulky and heavy, and there is cost of manufacture height, complex manufacturing technology and sensitivity are relatively low
A series of problems, such as.
Utility model content
The purpose of the present utility model is the defects of being directed to prior art, there is provided a kind of gas that can solve the problem that above mentioned problem
Body flow sensor.
According to one side of the present utility model, there is provided a kind of gas flow sensor, including：Housing, it is arranged on institute
The electrode and the first macromolecule membrane of enclosure interior are stated, wherein, the housing has the first end face and second being oppositely arranged
End face, at least one air admission hole for being flowed into under test gas is offered in the first end face, is opened in the second end face
Provided with least one venthole under test gas outflow；Gas is formed between the electrode and first macromolecule membrane
Circulation road；Central axial direction of the electrode along the housing is set, and first macromolecule membrane is to be set in the electricity
Extremely outside tubular film, the shape of first macromolecule membrane and the shape of the electrode match, and described first high
At least one vibrating diaphragm is further offered on molecular film；Air-flow by air admission hole, into the gas channel drive described in shake
Film vibrates；Wherein, each vibrating diaphragm has the fixing end being integrally connected with first macromolecule membrane and can treated described
Survey the free end with the electrode phase mutual friction under the drive of gas；The electrode is defeated for the signal of the gas flow sensor
Go out end.
Alternatively, the electrode further comprises：Metal electrode layer and be arranged on the outside of the metal electrode layer
Two macromolecule membranes, then the free end of each vibrating diaphragm can be high with second in the electrode under the drive of the under test gas
Molecular film phase mutual friction.
Alternatively, the housing is another output electrode of gas flow sensor, and the housing and the electrode
Respectively as the signal output part of the gas flow sensor.
Alternatively, form gap between the electrode and first macromolecule membrane, make the vibrating diaphragm free end and
The electrode is separate.
Alternatively, it is further provided between the electrode and first macromolecule membrane：At least one supporting construction,
The supporting construction is used to form the gap between the electrode and first macromolecule membrane.
Alternatively, 0.01-2.0mm gap is formed between the electrode and first macromolecule membrane.
Alternatively, at least one supporting construction integrated setting in the electrode close to first macromolecule membrane
A side surface on, or, at least one supporting construction is fixed on the electrode close to first macromolecule membrane
On one side surface.
Alternatively, the quantity of the supporting construction is multiple, and per two adjacent supporting constructions between it is spaced pre-
If distance；And the quantity of at least one vibrating diaphragm is multiple, and each vibrating diaphragm is separately positioned on per two adjacent support knots
Between structure.
Alternatively, first macromolecule membrane has multiple side surfaces, and at least one is respectively arranged with each side surface
Individual vibrating diaphragm.
Alternatively, the opposite polarity of the electrode and first macromolecule membrane, the easy betatopic of electrode, described the
One macromolecule membrane is easy to get electronics.
Alternatively, the vibrating diaphragm is the vibrating diaphragm cut out in advance from first macromolecule membrane, or, the vibrating diaphragm
The vibrating diaphragm being fixedly disposed on first macromolecule membrane.
Alternatively, the shape of the vibrating diaphragm includes at least one of the following：Rectangle, triangle, polygon and sector；
Wherein, when the quantity of the vibrating diaphragm is multiple, multiple vibrating diaphragms are set according to array mode.
Alternatively, the shape of the housing includes at least one of the following：Cylindric, prism-shaped, round table-like and rib
Mesa-shaped；The shape of the electrode includes at least one of the following：Cylindric, prism-shaped, round table-like and prism-frustum-shaped；And institute
Stating the shape of the first macromolecule membrane includes at least one of the following：Hollow cylindrical, hollow prism shape, hollow round table shape,
And hollow prism-frustum-shaped；Wherein, cylindric or prism-shaped, and first macromolecule are shaped as when the housing and electrode
When being shaped as hollow cylindrical or hollow prism shape of film, the internal diameter of first macromolecule membrane are more than the outer of the electrode
Footpath, and the internal diameter of the housing is more than the external diameter of first macromolecule membrane；It is shaped as justifying when the housing and electrode
Mesa-shaped or prism-frustum-shaped, and when being shaped as hollow round table shape or hollow prism-frustum-shaped of first macromolecule membrane, described first is high
The internal diameter of the upper surface of molecular film is more than the external diameter of the upper surface of the electrode, and the internal diameter of the upper surface of the housing is more than
The external diameter of the upper surface of first macromolecule membrane；The internal diameter of the lower surface of first macromolecule membrane is more than the electrode
Lower surface external diameter, and the internal diameter of the lower surface of the housing be more than first macromolecule membrane lower surface external diameter.
Gas flow sensor provided by the utility model is realized using triboelectricity principle, not only with light portable
Advantage, and cost of manufacture is cheap, manufacture craft is simple.Moreover, by further setting vibrating diaphragm on the first macromolecule membrane
Mode, takes full advantage of the effect of inertia of vibrating diaphragm free end, and then adds friction effect, improves signal sensitivity.
Brief description of the drawings
Fig. 1 is the cross-sectional view for the gas flow sensor that the utility model embodiment one provides；
Fig. 2 is the decomposition texture of a specific embodiment of the gas flow sensor that the utility model embodiment two provides
Schematic diagram；
Structural representation after the assembling for the gas flow sensor that Fig. 3 provides for the utility model embodiment two；
Fig. 4 is a kind of diaphragm structure schematic diagram for first macromolecule membrane that the utility model embodiment two provides；
Fig. 5 is the first macromolecule membrane and vibrating diaphragm and electrode after electrode assembling one that the utility model embodiment two provides
Between friction schematic diagram.
Embodiment
To be fully understood by the purpose of the utility model, feature and effect, by following specific embodiments, to this practicality
It is new to elaborate, but the utility model is not restricted to this.
Embodiment one
Fig. 1 is the cross-sectional view of gas flow sensor provided by the utility model.As shown in figure 1, in this reality
Apply in example, gas flow sensor includes：Hollow housing 110, the electrode 120 and first being arranged on inside hollow housing 110
Macromolecule membrane 130.Wherein, hollow housing 110 is hollow-core construction, and internal sleeve is equipped with the macromolecule membrane of electrode 120 and first
130.Hollow housing 110, the axis of the macromolecule membrane 130 of electrode 120 and first are located on the same line, and three
Surface be all separated from each other.In material, housing 110 can be metal shell, or nonmetallic insulation crust.Tying
On structure, housing 110 further comprises the first end face 111 being oppositely arranged and second end face 112.Wherein, opened in first end face 111
Provided with least one air admission hole for being flowed into under test gas, offered in second end face 112 for being flowed out under test gas
At least one venthole.Specifically, at least one end face in first end face 111 and second end face 112 can integration set
Put on housing 110, the internal structure of preferably shield gas flow rate sensor is carried out with this；Or first end face 111 and second
At least one end face in end face 112 can also be removeably positioned on housing 110, facilitate user to shell with this
Replacing and dismounting of body etc..
Electrode 120 is arranged on the inside of housing 110, is set along the central axial direction of housing 110, its surface can be set
For metal electrode layer, it can also be provided that non-metal electrode layer.Wherein, the inside of electrode 120 both can be solid construction, also may be used
Think hollow-core construction.Preferably, the inside of electrode 120 is hollow-core construction, in order in the macromolecule membrane of electrode 120 and first
While gas channel is formed between 130, and/or electrode 120 is internally formed gas channel, meanwhile, the electrode 120 of hollow-core construction
Weight is smaller, so that gas flow sensor is overall lighter；It is highly preferred that it is further provided with electrode 120
The through hole being inside interlinked to the outside, to increase the air-flow size in gas channel, lift friction effect.First macromolecule membrane 130 is
The tubular film being set in outside electrode 120, and the shape of the first macromolecule membrane 130 and the shape of electrode 120 match.The
At least one vibrating diaphragm is further offered on one macromolecule membrane 130, when air-flow passes through above-mentioned air admission hole, air-flow passes through above-mentioned
Gas channel drives diaphragm oscillations.Wherein, each vibrating diaphragm have the fixing end that is integrally connected with the first macromolecule membrane 130 and
Free end that can be under the drive of under test gas with the phase mutual friction of electrode 120.Wherein, the fixing end of each vibrating diaphragm, which is arranged on, leans on
The side of nearly air admission hole, the free end of each vibrating diaphragm are positioned close to the side of venthole, and this setup is used to ensure to work as
Air-flow from air admission hole be blown into when, air-flow is blown into from the direction of the fixing end of each vibrating diaphragm, so as to realize preferably friction effect
Fruit (inventor has found in an experiment, when air-flow is blown into from the direction of vibrating diaphragm fixing end, the starting of oscillation effect of vibrating diaphragm free end and
Friction effect is all preferable).Also, signal output part of the electrode 120 as gas flow sensor.
Specifically, between the first macromolecule membrane 130 and electrode 120 between be separated with pre-determined distance, the pre-determined distance be used for
Gas channel is formed between the macromolecule membrane 130 of electrode 120 and first, meanwhile, the spacing is also used for as the first macromolecule membrane
Vibrating diaphragm on 130 provides enough oscillation spaces.In specific implementation, above-mentioned pre-determined distance control is between 0.01-2.0mm.
In the case of not having gas inflow, the surface of vibrating diaphragm and electrode 120 on the first macromolecule membrane 130 does not produce friction, non-thoughts
Electric charge is answered to produce；When tested gas flows into from the air admission hole in first end face 111, vortex caused by tested gas makes above-mentioned shake
The free end of film produces vibration, and the free end of vibration produces the contact separation of corresponding frequencies with the surface of electrode 120, i.e., vibrating diaphragm with
The surface of electrode 120 produces friction, and then produces charge inducing on electrode 120.Wherein, electrode 120 passes as gas flow
The signal output part of sensor, the wire being connected with the electrode is provided with electrode 120, then the charge inducing quilt on the surface of electrode 120
Exported as electrical signal of reaction by above-mentioned wire.Wherein, electrode 120 can be collectively forming electric current with the earth point in external circuit
Loop, so as to realize electric signal output in a manner of single electrode.Wherein, above-said current signal includes the correlation such as magnitude of voltage, frequency values
Electric signal parameter.Measure and find through inventor, the gas flow rate of tested gas is bigger, and the vibration frequency of vibrating diaphragm is corresponding higher, then
The magnitude of voltage and frequency values of output are also bigger.Also, inventor further has found from the numerical value of measurement, gas flow rate and voltage
Be proportional relation between value V and frequency f, i.e., specific magnitude of voltage or frequency values correspond to certain air flow velocity, therefore,
The flow velocity of gas and flow further can be obtained by calculating by the magnitude of voltage and frequency values that obtain output.
As can be seen here, gas flow sensor manufacture craft provided by the utility model is simple, and cost of manufacture is cheap.And
And gas flow sensor provided by the utility model on the first macromolecule membrane further set vibrating diaphragm by way of,
The effect of inertia of vibrating diaphragm free end is taken full advantage of, the friction effect of triboelectricity is added, improves signal sensitivity.
Embodiment two
Fig. 2 to Fig. 5 shows the gas flow sensor that the utility model embodiment two provides from different perspectives respectively
A kind of structural representation of concrete structure.Wherein, Fig. 2 shows the decomposition texture schematic diagram of the gas flow sensor, and Fig. 3 shows
Structural representation after the assembling of the gas flow sensor is gone out, Fig. 4 shows the first high score in the gas flow sensor
The schematic diagram of sub- film, Fig. 5 show the first macromolecule membrane in the gas flow sensor with being shaken after electrode assembling one
Friction schematic diagram between film and electrode.As shown in Figures 2 to 5, the gas flow sensor includes：Housing 210 and set successively
Put the first macromolecule membrane 230, supporting construction 240 and the electrode 220 inside housing 210.Wherein, supporting construction 240 is set
To put in the outside of electrode 220, the first macromolecule membrane 230 is set in the outside of electrode 220 and supporting construction 240, also, the
Vibrating diaphragm 231 is further provided with one macromolecule membrane 230.
Specifically, housing 210 is introduced first.In shape, the shape of housing 210 can be cylindric, prism-shaped, round platform
The hollow shell of the shape such as shape and prism-frustum-shaped, wherein, being preferably shaped to for housing 210 is cylindric.In material, housing 210
It can be metal shell, or nonmetallic insulation shell.In structure, housing 210 further comprises first end face 211
And second end face 212.Wherein, at least one air admission hole flowed into under test gas is offered in first end face 211；Second end
Offered on face at least one venthole under test gas outflow.Wherein, the quantity of above-mentioned air admission hole and venthole is equal
Can be multiple, its shape can be netted stomata or poroid stomata.As shown in figure 3, Fig. 3 is and the decomposition texture in Fig. 2
Structural representation after the corresponding assembling of schematic diagram, from figure 3, it can be seen that under test gas is from the air inlet in first end face 211
Hole flows into, wherein, the quantity of air admission hole is multiple, is shaped as poroid stomata.Herein, it is to be noted that, first end face is enterprising
The shape of venthole and quantity can be configured by those skilled in the art according to actual conditions on stomata and second end face, this
Utility model is not restricted to this.
The internal sleeve of housing 210 is equipped with the macromolecule membrane 230 of electrode 220 and first, wherein, the position relationship of above-mentioned three
Specially：Housing 210, the axis of the macromolecule membrane 230 of electrode 220 and first are located on the same line, also, first
The internal diameter of macromolecule membrane 230 is more than the external diameter of electrode 220, and the internal diameter of housing 210 is more than the outer of the first macromolecule membrane 230
Footpath.I.e.：All have between the macromolecule membrane 230 of housing 210 and first and between the first macromolecule membrane 230 and electrode 220
Certain gap.
Next the macromolecule membrane 230 of electrode 220 and first is specifically introduced.Electrode 220 is introduced first.Specifically, it is electric
Central axial direction of the pole 220 along housing 210 is set, and in shape, the shape of electrode 220 can be cylindric, prism-shaped, circle
The shape such as mesa-shaped and prism-frustum-shaped；Wherein, in order to increase the friction area of electrode 220, preferred electrode 220 is shaped as side table
Face is the prism-shaped or prism-frustum-shaped of plane.For example, as shown in figure 5, the electrode 220 shown in Fig. 5 is hollow triangular prism shape.
In structure, electrode 220 both can be solid construction, or hollow-core construction.Preferably, the inside of electrode 220 is hollow knot
Structure, while in order to form gas channel between the macromolecule membrane 230 of electrode 220 and first, and/or inside electrode 220
Gas channel is formed, meanwhile, the weight of electrode 220 of hollow-core construction is smaller, so that gas flow sensor is overall lighter
Just；It is highly preferred that the through hole being interlinked to the outside in being further provided with electrode 220, the air-flow in gas channel is increased with this
Size, so as to further lift friction effect.
Next the first macromolecule membrane 230 is introduced.Specifically, in shape, it is corresponding to electrode 220, the first macromolecule
The shape of film 230 can be that hollow cylindrical, hollow prism shape, hollow round table shape and hollow prism-frustum-shaped etc. are variously-shaped；
Contact area when wherein, in order to increase the first macromolecule membrane 230 and the generation friction of electrode 220, preferably the first macromolecule are thin
Film 230 is the hollow prism shape with side surface or hollow prism-frustum-shaped, also, the first macromolecule membrane 230 and electrode 220
Shape keeps matching.That is, if being shaped as electrode 220 is cylindric, the first macromolecule membrane 230 corresponds to hollow circle
Column；If electrode 220 is shaped as triangular prism shape, the first macromolecule membrane 230 corresponds to hollow triangular prism shape etc..Example
Such as, as shown in figure 5, the first macromolecule membrane shown in Fig. 5 matches with electrode shape, in Figure 5, electrode shape is triangular prism
Shape, then the shape of the first macromolecule membrane is also correspondingly hollow triangular prism shape.
Specifically, cylindric or prism-shaped, and first macromolecule membrane are shaped as when the housing and electrode
When being shaped as hollow cylindrical or hollow prism shape, the internal diameter of first macromolecule membrane is more than the external diameter of the electrode,
And the internal diameter of the housing is more than the external diameter of first macromolecule membrane, in order in the macromolecule membrane of housing 210 and first
Gap is formed between 230 and between the first macromolecule membrane 230 and electrode 220.When being shaped as the housing and electrode
Round table-like or prism-frustum-shaped, and when being shaped as hollow round table shape or hollow prism-frustum-shaped of first macromolecule membrane, described first
The internal diameter of the upper surface of macromolecule membrane is more than the external diameter of the upper surface of the electrode, and the internal diameter of the upper surface of the housing is big
External diameter in the upper surface of first macromolecule membrane；The internal diameter of the lower surface of first macromolecule membrane is more than the electricity
The external diameter of the lower surface of pole, and the internal diameter of the lower surface of the housing is more than the outer of the lower surface of first macromolecule membrane
Footpath, in order between the macromolecule membrane 230 of housing 210 and first and between the first macromolecule membrane 230 and electrode 220
Form gap.Wherein, the first macromolecule membrane is hollow form, i.e. the first macromolecule membrane is the hollow structure that both ends are run through,
Above, the first macromolecule membrane upper and lower surface refers to：By the both sides of the first macromolecule membrane respectively in the first end face of housing
With the surface limited in second end face.Similarly, when electrode is hollow, the upper and lower surface of electrode is also similar meaning.
In structure, when the first macromolecule membrane 230 has multiple side surfaces, in the every of the first macromolecule membrane 230
At least one vibrating diaphragm 231 is further offered on individual side surface, as shown in figure 4, each side of the first macromolecule membrane in Fig. 4
Two vibrating diaphragms are all offered on surface.It is, of course, understood that in specific implementation, the first macromolecule membrane 230 it is each
The quantity of vibrating diaphragm 231 on side surface is not limited to two, can be one, or multiple, its particular number is by ability
Field technique personnel are configured according to actual conditions, and the utility model is not restricted to this.Wherein, vibrating diaphragm 231 is specifically used for：
After air-flow is by air admission hole, air-flow enters gas channel and drives vibrating diaphragm 231 to vibrate.Wherein, the realization side of said flow passage
Formula has a variety of, for example, can both be formed between electrode and the first macromolecule membrane, can also be formed at electrode interior, or
Can also simultaneously between electrode and the first macromolecule membrane and electrode interior formed gas channel.Specifically, at the first
In implementation, said flow passage is formed in the gap between the macromolecule membrane 230 of electrode 220 and first；At second
In implementation, in addition to forming gas channel in the gap between the macromolecule membrane 230 of electrode 220 and first, may be used also
Further also to form gas channel in the inside of electrode 220, such as set what is be interlinked to the outside in several to lead in the inside of electrode 220
Hole, or the inside of electrode 220 is arranged to hollow-core construction etc., in a word, set gas channel can be more inside electrode 220
Be advantageous to the acceleration flowing of air-flow, so as to realize more preferable friction effect.Those skilled in the art can be clever as needed
It is living that above-mentioned gas channel is set.
Next the structure of vibrating diaphragm 231 is introduced.The structure of vibrating diaphragm 231 is specific as follows：It is every on first macromolecule membrane 230
Individual vibrating diaphragm 231 have the fixing end that is integrally connected with the first macromolecule membrane 230 and can under the drive of under test gas with
The free end of electrode phase mutual friction.Wherein, the fixing end of vibrating diaphragm 231 is positioned close to the side of air admission hole, the freedom of vibrating diaphragm 231
End is positioned close to the side of venthole, and this setup is used to ensure when air-flow is blown into from air admission hole, and air-flow is from each
The direction of the fixing end of vibrating diaphragm is blown into, so as to realize preferable friction effect.Wherein it is preferred to vibrating diaphragm 231 can be from
The vibrating diaphragm of preset shape is cut on first macromolecule membrane 230 in advance, it is correspondingly, high first after cutting vibrating diaphragm 231
The empty portions formed on molecular film 230 can preferably pass in and out air-flow, so as to lift friction effect；Moreover, vibrating diaphragm 231
Free end can move back and forth under air-flow drive, i.e.,：Vibrating diaphragm 231 produces under the drive of airflow acting force at above-mentioned vacancy position
The vibration of raw corresponding frequencies, the vibration can make the free end of vibrating diaphragm 231 produce friction with the surface of electrode 220, so as to realize
Vibrating diaphragm 231 produces the effect of friction under the drive of airflow acting force.Also, further, those skilled in the art can be with
The structure design of vibrating diaphragm 231 is continued to the structure of starting of oscillation according to experimental conditions in practice for inertia can be made full use of to realize,
For example, the size of design vibrating diaphragm 231 free end is slightly larger than the size of the fixing end of vibrating diaphragm 231, then the free end of vibrating diaphragm 231 by
After airflow acting force produces vibration, the vibrating diaphragm 231 in vibration can the sustained vibration under effect of inertia, the effect of inertia and air-flow work
With vibrating diaphragm 231 is acted on simultaneously, the vibrating effect of vibrating diaphragm 231 is further increased, so as to further lift friction effect.
Certainly, in other embodiments of the present utility model, the vibrating diaphragm of multiple preset shapes can also be fixedly installed on the first high score
On sub- film 230, herein, the utility model is not limited the specific set-up mode of vibrating diaphragm 231, as long as contact can be played
Friction effect both may be used.Wherein, the shape of vibrating diaphragm 231 can be the shapes such as rectangle, triangle, polygon and sector, also, shake
The length of film 231 can carry out adaptability setting by those skilled in the art according to the shape of vibrating diaphragm, to avoid due to vibrating diaphragm mistake
It is long it is either too short caused by diaphragm oscillations it is unstable or can not starting of oscillation situation.Wherein, when the quantity of vibrating diaphragm 231 is multiple
When, above-mentioned multiple vibrating diaphragms are arranged on the first macromolecule membrane 230 according to array mode, also, in order to lift friction effect,
, can be in each side of the first macromolecule membrane 230 of hollow prism shape when the first macromolecule membrane 230 is hollow prism shape
One or more vibrating diaphragms are set respectively on surface.As shown in figure 4, the first macromolecule membrane shown in Fig. 4 is hollow triangular prism shape,
Vibrating diaphragm 231 is multiple rectangle vibrating diaphragms being separately positioned on each side surface of first macromolecule membrane, is had in rectangle vibrating diaphragm
While it is connected with the first macromolecule membrane 230, so as to form the fixing end of the rectangle vibrating diaphragm；Its excess-three side is separation shape, so as to
Form the free end of the rectangle vibrating diaphragm.Also, figure 4, it is seen that the quantity of vibrating diaphragm can be multiple, the vibrating diaphragm in Fig. 4
It is arranged in a manner of array on the first macromolecule membrane 230.
Specifically, for the ease of friction, pre-determined distance is spaced between the first macromolecule membrane 230 and electrode 220, this is default
Distance is used to provide enough oscillation spaces for the vibrating diaphragm on the first macromolecule membrane 230.In specific implementation, the pre-determined distance can
To control between 0.01-2.0mm.Specifically, above-mentioned pre-determined distance can be realized by following two ways：In the first realization
In mode, the both ends of electrode 220 are separately fixed on the first end face 211 of housing 210 and the inwall of second end face 212,
Meanwhile the both ends of the first macromolecule membrane 230 are also separately fixed to the first end face 211 and second end face 212 of housing 210
Inwall on, make it is fixed after housing 210 and the first macromolecule membrane 230 between keeps separating, and make the electricity after fixation
Above-mentioned pre-determined distance between the macromolecule membrane 230 of pole 220 and first be present, this kind of mode is particularly suitable for use in the first macromolecule membrane
In the harder scene of material.In second of implementation, in order to prevent the middle part of the first macromolecule membrane 230 and electrode 220
Contact with each other so as to efficiently separate, be further provided between the macromolecule membrane 230 of electrode 220 and first：At least one
Individual supporting construction 240, supporting construction 240 are used to form gap between the macromolecule membrane 230 of electrode 220 and first, make first
The free end of vibrating diaphragm on macromolecule membrane 230 and electrode 220 are separate.In specific implementation, supporting construction 240 is being set
When, can by the integrated setting of supporting construction 240 on the relative side surface of the macromolecule membrane 230 of electrode 220 and first or
It is arranged on the first macromolecule membrane 230 and the relative side surface of electrode 220, to prevent supporting construction 240 due to the original such as come off
Because causing a face continuous contact of the first macromolecule membrane 230 on electrode 220, and then ideal friction effect can not be realized
Fruit；Or supporting construction 240 can also be arranged to dismountable structure, in order to which user dismantles to supporting construction 240
And replacing.Wherein, the thickness of supporting construction 240 is preferably between 0.01-2.0mm, then those skilled in the art can also be set
The supporting construction 240 of multigroup different-thickness, so that user can select the support of different-thickness according to different situations in practice
Structure 240 carries out dismounting and change.Wherein, the quantity of supporting construction 240 can be one, or multiple.Work as supporting construction
When 240 quantity is multiple, apart from one another by pre-determined distance between every two adjacent supporting constructions 240.Wherein, it is above-mentioned default
Between distance can ensure that each vibrating diaphragm is separately positioned on per two adjacent supporting constructions 240.I.e.：In the first macromolecule membrane
230 with supporting construction 240 not in contact with the corresponding vibrating diaphragm of part setting, the vibrating diaphragm can produce and shakes in the presence of air-flow drive
It is dynamic, and its vibration processes will not be supported the influence of structure 240.In a word, it is able to ensure that first is high by supporting construction 240
Efficiently separating between molecular film and electrode, the situation that preventing two frictional interfaces can not efficiently separate after contact occur,
And then lift friction effect.Two kinds of above-mentioned implementations both can be used alone and can also be used in combination.
After the structure for having introduced gas flow sensor, next, the work for introducing above-mentioned gas flow sensor is former
Reason：
It is fashionable in no gas stream, friction is not produced between the macromolecule membrane 230 of electrode 220 and first, therefore is not felt
Electric charge is answered to produce；Wherein, the opposite polarity material of the generally use of 220 and first macromolecule membrane of electrode 230 makes (such as electrode
Typically made by the material of easy betatopic, and the first macromolecule membrane is then typically made using the material for the electronics that is easy to get), this
When, because the pre-determined distance between the macromolecule membrane 230 of electrode 220 and first is smaller, therefore on the first macromolecule membrane 230
Vibrating diaphragm can be adsorbed on the surface of electrode 220.When tested gas flows into from the air admission hole in the first end face of housing 210, gas is tested
Vortex caused by body makes the free end of above-mentioned vibrating diaphragm produce vibration, and the free end of vibration produces respective tones with the surface of electrode 220
The contact separation of rate, i.e. vibrating diaphragm on the first macromolecule membrane 230 and the surface of electrode 220 produce friction, then vibrating diaphragm and electrode
Corresponding charge inducing is produced on 220.In specific implementation, as shown in figure 5, Fig. 5 be the first macromolecule membrane on vibrating diaphragm with
Friction schematic diagram between electrode.Wherein, the electrode 220 in Fig. 5 is arranged on the inside of the first macromolecule membrane 230, with first
Certain pre-determined distance between macromolecule membrane 230 be present, when air-flow to be measured flows into, drive of the vibrating diaphragm 231 in air-flow to be measured
Lower up-down vibration, produce between electrode 220 and quickly separate, i.e., the surface of vibrating diaphragm and electrode produces friction, generation sense
Electric charge is answered, charge inducing is flowed out from electrode 220 so as to export corresponding electric signal.Wherein, electrode 220 and the ground connection in external circuit
Point is collectively forming current loop, so as to realize electric signal output in a manner of single electrode.
In addition, the gas flow sensor of said structure is mainly by the contact between the first macromolecule membrane and electrode
Friction is generated electricity, and in the specific implementation, those skilled in the art can also be to the internal structure of above-mentioned gas flow sensor
Carry out various changes and deformation：
For example, electrode 220 therein can be realized further by following two schemes again：
Scheme one：Electrode 220 only includes single metal electrode layer, correspondingly, is each shaken on the first macromolecule membrane 230
The free end of film can under the drive of under test gas with the metal electrode layer phase mutual friction in electrode 220.Wherein, because metal
With high molecular polymer friction, metal is more easy to lose electronics, therefore the surface of electrode 220 is arranged into metal electrode layer, is used
Metal electrode rubs with high molecular polymer (i.e. the first macromolecule membrane 230), can effectively strengthen the generation of charge inducing simultaneously
Increase the sensitivity of the electric signal of output.Herein, the opposite polarity of the macromolecule membrane 230 of electrode 220 and first, electrode 220
Easily betatopic, the first macromolecule membrane 230 are easy to get electronics.I.e.：Above-mentioned metal electrode layer easily betatopic, above-mentioned first high score
Sub- film easily obtains electronics.
Scheme two：Different from the single layer structure in scheme one, the electrode in scheme two is composite construction, specifically, electrode
220 further comprise：Metal electrode layer and the second macromolecule membrane being arranged on the outside of metal electrode layer, then each vibrating diaphragm
Free end can under the drive of under test gas with the second macromolecule membrane phase mutual friction in electrode 220.Specifically, in we
In case, one layer of second macromolecule membrane is further set on the metal electrode layer of electrode 220, for example, can be in electrode 220
Metal electrode layer on brush one layer of second macromolecule membrane again, then each vibrating diaphragm on the first macromolecule membrane 230 from
By holding, phase mutual friction produces induced electricity between the second macromolecule membrane in electrode 220 in the presence of under test gas drive
Lotus, i.e., induced electricity is produced by the friction between polymer (the first macromolecule membrane) and polymer (the second macromolecule membrane)
Lotus, and electric signal is exported by the metal electrode layer inside the second macromolecule membrane, it is achieved thereby that similar with such scheme one
Friction effect.
Specifically, in scheme one or scheme two, the material of metal electrode layer is specifically as follows metal or alloy, wherein gold
Category can be Au Ag Pt Pd, aluminium, nickel, copper, titanium, chromium, tin, iron, manganese, molybdenum, tungsten or vanadium；Alloy can be aluminium alloy, titanium conjunction
Gold, magnesium alloy, beryllium alloy, copper alloy, kirsite, manganese alloy, nickel alloy, metal, tin alloy, cadmium alloy, bismuth alloy, indium close
Gold, gallium alloy, tungsten alloy, molybdenum alloy, niobium alloy or tantalum alloy.In addition, the material of metal electrode layer can also be further
Selected from non-metallic conducting materials such as indium tin oxide, graphene, silver nanowire films.First macromolecule membrane and the second macromolecule are thin
It is thin that the material of film is selected from Kapton, aniline formaldehyde resin film, polyoxymethylene film, ethyl cellulose film, polyamide
Film, melamino-formaldehyde film, poly (ethylene glycol) two acid ester film, cellophane, cellulose acetate film, polyadipate
Glycol ester film, polydiallyl phthalate film, fiber (regeneration) sponge films, elastic polyurethane body thin film, benzene
Ethylene propylene copolymer film, styrene-butadiene-copolymer film, staple fibre film, poly- methyl film, methacrylic acid
It is ester film, polyvinyl alcohol film, polyvinyl alcohol film, polyester film, polyisobutene film, polyurethane flexible sponge films, poly-
Ethylene glycol terephthalate film, polyvinyl butyral film, formaldehyde-phenol film, neoprene film, butadiene third
Alkene copolymer film, natural rubber films, polyacrylonitrile film, acrylonitrile vinyl chloride film and polyethylene the third diphenol carbonate are thin
One kind in film.Wherein, the material of the first macromolecule membrane and the second macromolecule membrane can be with identical in principle, can also not
Together.But if the material of two layers of macromolecule membrane is all identical, the quantity of electric charge very little of triboelectrification can be caused.It is preferred that
First macromolecule membrane is different from the material of the second macromolecule membrane.
Correspondingly, the setting of supporting construction 240 mentioned above is directed to, its corresponding scheme is as follows：If electrode 220 uses
Structure in scheme one, i.e.,：The outer layer of electrode 220 only includes single metal electrode layer, then supporting construction 240 mentioned above
It is correspondingly arranged at the outside of the metal electrode layer of electrode 220；If electrode 220 uses the structure in scheme two, i.e.,：Outside electrode 220
The second macromolecule membrane is also further provided with the metal electrode layer of layer, then supporting construction 240 mentioned above is correspondingly arranged
The outside of the second macromolecule membrane in electrode 220.
Further,, can also be further to the table of electrode 220 in order to increase friction effect in above-mentioned two scheme
Face is further set, and the surface of electrode 220 is formed plane or coarse point-like.Wherein, plane-shaped electrode is surface
It is because the electrostatic adsorption force of charge inducing caused by plane-shaped electrode friction is smaller, i.e., caused quiet for the electrode of smooth flat
The absorption affinity of Electro Sorb vibrating diaphragm is smaller, therefore in the presence of air-flow, when the vibrating diaphragm on the first macromolecule membrane 230 is set with surface
When being set to plane electrode 220 and being rubbed, the vibrating diaphragm brought because electrostatic force caused by friction is larger can be overcome to shake
The problem of dynamic unstable；Coarse Spot electrodes have the electrode of certain roughness, the relatively large roughness having due to it for surface
Surface can produce more charge inducing in friction, therefore the vibrating diaphragm on the first macromolecule membrane 230 is arranged to surface
When the electrode 220 of coarse point-like is rubbed, the surface of coarse Spot electrodes can increase frictional resistance, so as to increase friction life
Into charge inducing and increase output electric signal, improve the sensitivity of electric signal output.Wherein, above-mentioned coarse Spot electrodes can be with
Realized by way of being polished on the surface of electrode 220 or concaveconvex structure is set, wherein, above-mentioned concaveconvex structure can be
The concavo-convex knot of the regular shapes such as semicircle, striated, cubic type, rectangular pyramid or cylinder or other irregular shapes
Structure.
In addition, each scheme in above two scheme, can be further divided into two kinds of implementations again：First
In kind implementation, signal output part only can be used as by electrode 220；In second of implementation, can by electrode 220 with
An other output electrode collectively forms signal output part, for example, housing 210 can be arranged to metal shell, so that
Another signal output part of housing 210 as gas flow sensor.That is, when housing 210 is metal shell, can
To set housing 210 as another output electrode.Specifically, housing 210 forms an output in gas flow sensor
Electrode, between the macromolecule membrane 230 of housing 210 and first is set apart from when, the two distance is arranged on default
Within the scope of distance, such as between above-mentioned distance between the two being arranged on into 0.01-2.0mm, then when the first high score
When vibrating diaphragm on sub- film 230 produces up-down vibration under the drive of air-flow, the above-mentioned vibrating diaphragm not only electrode surface with electrode 220
Friction is produced, inner surface that can also be further with housing 210 produces friction, so as to produce phase on the inner surface of housing 210
The charge inducing answered, then housing 210 now can be as another signal output part in addition to electrode 220.Herein, to say
Bright, the material of housing 210 could be arranged to metal, it can also be provided that other conductive materials in addition to metal
Material；Or housing 210 can also be further arranged to double-layer structure, i.e.,：One Rotating fields of the inside of housing 210 can be arranged to
Metal, then one layer of high molecular film material etc. is set again outside above-mentioned metal.Herein, as long as can realize housing
210 are used as another signal output part, and the utility model is not restricted to the material and structure of housing 210.
Wherein, in the first implementation of scheme one and scheme two, a signal output part, i.e. electrode are provided only with
220 are used as unique signal output part；And in second of implementation of scheme one and scheme two, it is defeated to be provided with two signals
Go out end, respectively electrode 220 and housing 210.Wherein, when only setting a signal output part, that is, the conduct of electrode 220 is selected
Unique signal output part, electrode 220 are collectively forming current loop with the earth point in external circuit；When two signal outputs of setting
During end, that is, when selecting electrode 220 and housing 210 as signal output part, due to electrode 220 and housing 210 the two electricity
There is electrical potential difference between the layer of pole and form current loop.
In addition, on the basis of any implementation of scheme two, those skilled in the art can also be further second
Film layer between two parties or intervening electrode layer are set up between macromolecule membrane and the first macromolecule membrane, so as to further increase friction circle
The quantity in face, lift friction effect.In a word, the utility model is not limited the particular number and implementation of frictional interface,
Those skilled in the art can flexibly set the form of frictional interface, as long as the effect of triboelectricity can be realized.
Finally, the electric signal and the flow and flow rate of the under test gas of its inside of gas flow sensor output are introduced
Between conversion relation：
After the electric signal of signal output part output is obtained, by being carried out to the respective value included in above-said current signal
Handle to obtain the flow velocity of tested gas and flow.Wherein, above-said current signal includes the related telecommunications such as magnitude of voltage, frequency values
Number parameter.Measure and find through inventor, the gas flow rate of tested gas is bigger, and the vibration frequency of vibrating diaphragm is corresponding higher, then exports
Magnitude of voltage and frequency it is also bigger.Also, inventor further has found from the numerical value of measurement, gas flow rate and magnitude of voltage V with
And between frequency f be proportional relation, i.e. air-flow velocity (i.e.：Gas flow rate) between magnitude of voltage V, air-flow velocity and frequency f
Relation is linear relationship, therefore, can further be counted by the magnitude of voltage, frequency values and the time span of measurement that obtain output
The flow velocity and flow of gas are calculated, so as to realize the purpose of the flow velocity of measurement gas and flow.Wherein, above-mentioned measurement is specific
Experimental data is as shown in table 1, and table 1 is that the sample measured under gas with various flow velocity exports electric signal parameter table, project 1 and project
Specific sample parameters in 2 are different, and therefore, the measured value under same airflow flow velocity is also different.As can be seen from Table 1,
Relation in table 1 between different air-flow velocities and magnitude of voltage V, air-flow velocity and frequency f is approximate linear.Wherein, by
Affected by various parameters in measurement result, further, since the presence of experimental error, the data in table 1 do not show tight
The linear relationship of lattice, however, it is possible to, it is evident that either in project 1 or in project 2, with the increasing of air-flow velocity
Greatly, magnitude of voltage and frequency values all correspondingly increase therewith.Wherein, a kind of optional parameter information for measuring sample is as follows：Sample
Product shell is metal shell, a diameter of 6.0mm, and the spacing (i.e. electrode tripod shoulder height) of vibrating diaphragm and electrode is 1.0mm, is shaken
Film thickness is 4~6um, and vibrating diaphragm is rectangle, length 3.50mm, width 1.0mm.
Table 1
As can be seen here, gas flow sensor provided by the utility model realizes not only have using triboelectricity principle
Light portable advantage, and cost of manufacture is cheap, manufacture craft is simple, has that implementation is strong, easy-to-assemble feature.Meanwhile
In the course of work of gas flow sensor provided by the utility model, by further being set on the first macromolecule membrane
Vibrating diaphragm, make full use of vibrating diaphragm free end to be produced under airflow function and vibrate and then produce friction effect, and vibrating diaphragm is vibrated
Friction effect in journey during caused effect of inertia increase triboelectricity, and by setting the triboelectricity side of various ways
Case obtains more accurate and effective induced signal, improves signal sensitivity, while also improve gas flow sensor
The accuracy of work.
The various modules that are previously mentioned in the utility model, circuit are by hard-wired circuit, although some of which mould
Block, circuit are integrated with software, but the utility model it is claimed be function corresponding to integrated software hardware circuit, and not only
Only be software in itself.
It should be appreciated by those skilled in the art that the apparatus structure shown in accompanying drawing or embodiment is only schematical, table
Show logical construction.Wherein it is probably as the module that separating component is shown or may not be physically separate, as module
The part of display is probably or may not be physical module.
Finally it should be noted that be：Listed above is only specific embodiment of the utility model, certain this area
The utility model can be modified by technical staff and modification, if these modifications and variations belong to the utility model right and wanted
Ask and its equivalent technologies within the scope of, be considered as the scope of protection of the utility model.
Claims (13)
- A kind of 1. gas flow sensor, it is characterised in that including：Housing, it is arranged on the electrode and of the enclosure interior One macromolecule membrane, wherein,The housing has the first end face and second end face being oppositely arranged, and is offered in the first end face for supplying gas to be measured At least one air admission hole that body flows into, offer in the second end face at least one outlet under test gas outflow Hole；Gas channel is formed between the electrode and first macromolecule membrane；Central axial direction of the electrode along the housing is set, and first macromolecule membrane is to be set in outside the electrode The tubular film in portion, the shape of first macromolecule membrane and the shape of the electrode match, and first macromolecule At least one vibrating diaphragm is further offered on film；Air-flow drives the vibrating diaphragm to shake by air admission hole into the gas channel It is dynamic；Wherein, each vibrating diaphragm has the fixing end that is integrally connected with first macromolecule membrane and can be in the gas to be measured Under the drive of body with the free end of the electrode phase mutual friction；The electrode is the signal output of the gas flow sensor End.
- 2. gas flow sensor according to claim 1, it is characterised in that the electrode further comprises：Metal electricity Pole layer and the second macromolecule membrane being arranged on the outside of the metal electrode layer, then the free end of each vibrating diaphragm can be described Under the drive of under test gas with the second macromolecule membrane phase mutual friction in the electrode.
- 3. gas flow sensor according to claim 1 or 2, it is characterised in that the housing senses for gas flow Another output electrode of device, and the housing and the electrode are respectively as the signal output of the gas flow sensor End.
- 4. gas flow sensor according to claim 1 or 2, it is characterised in that the electrode and first high score Gap is formed between sub- film, the free end and the electrode for making the vibrating diaphragm are separate.
- 5. gas flow sensor according to claim 4, it is characterised in that the electrode and first macromolecule are thin It is further provided between film：At least one supporting construction, the supporting construction are used in the electrode and first high score The gap is formed between sub- film.
- 6. gas flow sensor according to claim 5, it is characterised in that the electrode and first macromolecule are thin 0.01-2.0mm gap is formed between film.
- 7. gas flow sensor according to claim 5, it is characterised in that at least one supporting construction integration The electrode is arranged on a side surface of first macromolecule membrane, or, at least one supporting construction is consolidated The electrode is scheduled on a side surface of first macromolecule membrane.
- 8. gas flow sensor according to claim 5, it is characterised in that the quantity of the supporting construction to be multiple, And spaced pre-determined distance between every two adjacent supporting constructions；And the quantity of at least one vibrating diaphragm is multiple, and each vibrating diaphragm is separately positioned on per two adjacent supporting constructions it Between.
- 9. gas flow sensor according to claim 8, it is characterised in that first macromolecule membrane has multiple Side surface, at least one vibrating diaphragm is respectively arranged with each side surface.
- 10. gas flow sensor according to claim 1, it is characterised in that the electrode and first macromolecule The opposite polarity of film, the easy betatopic of electrode, first macromolecule membrane are easy to get electronics.
- 11. gas flow sensor according to claim 1, it is characterised in that the vibrating diaphragm is from first high score The vibrating diaphragm cut out in advance on sub- film, or, the vibrating diaphragm is fixedly disposed at the vibrating diaphragm on first macromolecule membrane.
- 12. gas flow sensor according to claim 11, it is characterised in that the shape of the vibrating diaphragm include it is following in It is at least one：Rectangle, triangle, polygon and sector；Wherein, when the quantity of the vibrating diaphragm is multiple, multiple vibrating diaphragms are set according to array mode.
- 13. gas flow sensor according to claim 1, it is characterised in that the shape of the housing include it is following in It is at least one：Cylindric, prism-shaped, round table-like and prism-frustum-shaped；The shape of the electrode includes at least one of the following：Cylindric, prism-shaped, round table-like and prism-frustum-shaped；And the shape of first macromolecule membrane includes at least one of the following：It is hollow cylindrical, hollow prism shape, hollow Round table-like and hollow prism-frustum-shaped；Wherein, cylindric or prism-shaped, and the shape of first macromolecule membrane are shaped as when the housing and electrode For hollow cylindrical or hollow prism shape when, the internal diameter of first macromolecule membrane is more than the external diameter of the electrode, and described The internal diameter of housing is more than the external diameter of first macromolecule membrane；When the round table-like or prism-frustum-shaped that is shaped as of the housing and electrode, and first macromolecule membrane be shaped as it is hollow During round table-like or hollow prism-frustum-shaped, the internal diameter of the upper surface of first macromolecule membrane is more than the outer of the upper surface of the electrode Footpath, and the internal diameter of the upper surface of the housing is more than the external diameter of the upper surface of first macromolecule membrane；First high score The internal diameter of the lower surface of sub- film is more than the external diameter of the lower surface of the electrode, and the internal diameter of the lower surface of the housing is more than institute State the external diameter of the lower surface of the first macromolecule membrane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720333615.5U CN206670696U (en) | 2017-03-31 | 2017-03-31 | Gas flow sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720333615.5U CN206670696U (en) | 2017-03-31 | 2017-03-31 | Gas flow sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107402048A (en) * | 2017-03-31 | 2017-11-28 | 纳智源科技（唐山）有限责任公司 | Gas flow sensor |
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2017
- 2017-03-31 CN CN201720333615.5U patent/CN206670696U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107402048A (en) * | 2017-03-31 | 2017-11-28 | 纳智源科技（唐山）有限责任公司 | Gas flow sensor |
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