CN208060048U - A kind of cylindrical structure integral type resonance pressure sensor - Google Patents
A kind of cylindrical structure integral type resonance pressure sensor Download PDFInfo
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- CN208060048U CN208060048U CN201820590377.0U CN201820590377U CN208060048U CN 208060048 U CN208060048 U CN 208060048U CN 201820590377 U CN201820590377 U CN 201820590377U CN 208060048 U CN208060048 U CN 208060048U
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Abstract
The utility model discloses a kind of cylindrical structure integral type resonance pressure sensors,It is related to sensor field,More particularly to a kind of cylindrical structure integral type resonance pressure sensor,It is easy to aging for solving under the existing prior art between quartz resonance pressure sensor sensing element and structure to bring using bonding method,Hardly possible positioning,There are temperature drifts,Stress concentration and the small problem of range,The utility model includes sensing element and sensor main body,The sensing element is all made of quartz,Including component body,Resonant chip and first through hole,The component body is hollow cylindrical structure,The top of the component body is equipped with the force platform of horizontal cross-section,The bottom of the component body is equipped with the fixed platform of horizontal cross-section,The front center of the component body offers first through hole,The first through hole center is equipped with the resonant chip being connected with component body,The utility model has the structure linearity more preferable,Range is big,Solves the problems, such as the advantages of unbalance loading.
Description
Technical field
The utility model is related to sensor field more particularly to a kind of cylindrical structure integral type resonance pressure sensors.
Background technology
Pressure sensor on the market is nothing more than pressure resistance type, piezoelectric type or resonant mode at present；Piezoresistive pressure sensor
Sensing unit be varistor, feature is to cause resistance value to change when ambient pressure acts on varistor, is passed through
The variation for measuring output voltage values converses the size of external pressure.The shortcomings that such sensor, is that temperature drift is serious, and for a long time
Using being also easy to produce creep effect, therefore apply the test of the low static force of required precision.Piezoelectric transducer uses piezoelectric quartz or pottery
The maximum feature piezoelectric modulus of ceramic material, such sensor is high, and Q values are high therefore measuring accuracy is high；But it is that can test dynamic force.Most
Resonance type pressure sensor increasingly attracted attention in recent years, was made using piezoelectric resonator component, with resonance component
Frequency variation perception external force size, feature Direct Digital frequency signal output, and precision compared with above two height, in addition
Such sensor can test static power while can also test dynamic power；Pass is received under degree of precision power test case
Note.
It is the installation question between sensing element and structure that maximum problem is faced when making the sensor.It is passing
Way be that the two is linked together by way of stickup, such way can have the following：
1, the connection of glue point can lead to sensor long-time stability.Since glue can be long with the influence of extraneous temperature
Phase aging will cause sensing element to go wrong with interstructural bonding force.
2, the connection of glue point is unable to control the bonding force between Sensitive Apparatus and structure, sensor in each device of result
The prestressing force cause not of uniform size of part, will cause the consistency of final products is excessively poor can not produce in batches.
3, it is difficult to ensure that positioning relation between Sensitive Apparatus and structure during dispensing.
4, due to glue point, the material between structure and sensitive components three is different, and coefficient of thermal expansion is also different, when outer
When boundary's temperature changes, the temperature drift of sensor is unable to control.Switzerland Qi Shile is tied it is also proposed that integral structure
The connection of chip and metal structure is still had in structure, therefore two kinds of material different temperatures coefficients of expansion can not be avoided to cause to sense
The temperature drift problem of device.
Utility model content
The purpose of this utility model is that:To solve the above-mentioned problems, the utility model provides a kind of cylindrical structure one
Body formula resonance pressure sensor, using the configuration of full quartz construction, the cut type of resonant chip is consistent with structural framing, total
It is integral type, there is no glue points to connect, and has range big, easily produces in batches, structure positioning is accurate, there is no temperature drift, answers
Power collection neutralizes the advantages of unbalance loading problem.
The technical solution adopted in the utility model is as follows：
A kind of cylindrical structure integral type resonance pressure sensor, including sensing element and sensor main body, the sensing
Device main body includes pedestal, lead, bottom plate and external connection, and the bottom plate is equipped with amplifying circuit, and the sensing element is fixed on base
In seat, the sensing element and amplifying circuit are electrically connected by lead, and the external connection is electrically connected with amplifying circuit, and feature exists
In the sensing element is all made of quartz, including component body, resonant chip and first through hole, and the component body is
Hollow cylindrical structure, the top of the component body are equipped with the force platform of horizontal cross-section, and the bottom of the component body is set
There are the fixed platform of horizontal cross-section, the front center of the component body to offer first through hole, the first through hole center is set
There is the resonant chip being connected with component body.
Further, in the structure size of the component body, hollow cylinder wall thickness is 4.70~4.80mm, and outer diameter is
13mm~15mm.
Further, the cylinder front center through component body of the first through hole, the first through hole
Internal diameter is 8.5mm~9.0mm.
Further, the thickness of the resonant chip is 0.200mm~0.210mm, including stress piece and connection sheet are described
Two panels connection sheet is extended at the symmetrical both ends of stress piece, and the connection sheet is seamlessly connected with first through hole inner wall.
Further, the connection sheet maximum width is less than stress piece diameter.
Further, the amplifying circuit includes resistance Rb1, resistance Rb2, resistance Rc1, resistance Rc2, capacitance C1, can be changed
Capacitance C2, triode T1 and triode T2, one end of sensing element is connected with variable capacitance C2 and resistance Rc2 successively to be followed by exporting
The other end of terminal Ec, sensing element are connected with the base stage of one end of resistance Rb1 and triode T1 respectively, the resistance Rb1's
The other end connects the emitter for being followed by leading-out terminal V0, the triode T1 with triode T2's with capacitance C1 resistance Rb2 successively
Emitter is grounded, and the collector of triode T1 is connected with resistance Rc1 is followed by leading-out terminal EC, the base stage of the triode T2 and
Collector is connected in parallel on the both ends of resistance Rb2.
In conclusion by adopting the above-described technical solution, the utility model has the beneficial effects that：
1. the utility model uses integral structure, there is no glue points to paste, and also just there is no affixed points long-term ageings
Problem, longer life expectancy.
2. the integral structure of the utility model makes the conduction of the power between element body and resonant chip controllable, each
Prestressing force in sensing element is in the same size, and the consistency of product is good, is conducive to produce in batches.
3. the utility model resonant chip and element body are an integral structure, positioning is not present in process of production and asks
Topic, can improve production efficiency.
4. the utility model resonant chip and element body are all using the quartz crystal of same cut type, having the same swollen
Swollen coefficient, when ambient temperature changes, the temperature drift of sensor is controllable.
5. the improvement that the utility model punches element body so that resonant chip stress maximizes, and improves
Chip uniform force, to improve the sensitivity of sensor.
6. the utility model component body uses hollow cylindrical structure, answering for common rectangular parallelepiped structure generation can be solved
The problems in power collection promotes the range of sensor, while hollow cylindrical structure can preferably solve power and act on structure table
Unbalance loading problem caused by the different location of face, the structure linearity is preferable, and the Nonlinear Error of Transducer of more generally square shaped design reduces
1 times
Description of the drawings
The utility model will illustrate by example and with reference to the appended drawing, in the accompanying drawings：
Fig. 1 is the utility model overall structure diagram；
Fig. 2 is the utility model amplifying circuit schematic diagram；
Fig. 3 is 1 sensing element structural schematic diagram of the utility model embodiment；
Fig. 4 is 1 sensing element force analysis figure of the utility model embodiment；
Fig. 5 is 1 sensing element FEM analogous diagrams of the utility model embodiment；
Reference numeral：1, sensing element；1-1, component body；1-1-1, stress platform；1-1-2, fixed platform；It is 1-2, humorous
Shake chip；1-2-1, stress piece；1-2-2, connection sheet；1-3, first through hole；1-4, the second through-hole；2, sensor main body；3, base
Seat；4, lead；5, bottom plate；6, external connection；7, amplifying circuit.
Specific implementation mode
It is new to this practicality with reference to the accompanying drawings and examples in order to which those skilled in the art are better understood from utility model
Type is described in detail.
Embodiment 1：
As shown in figures 1 and 3, a kind of cylindrical structure integral type resonance pressure sensor, including sensing element 1 and sensing
Device main body 2, the sensor main body 2 include pedestal 3, lead 4, bottom plate 5 and external connection 6, and the bottom plate 5 is equipped with amplifying circuit
7, the sensing element 1 is fixed in pedestal 3, and the sensing element 1 and amplifying circuit 7 are electrically connected by lead 4, described external
Line 6 is electrically connected with amplifying circuit 7, which is characterized in that and the sensing element 1 is all made of quartz, including component body 1-1,
Resonant chip 1-2 and first through hole 1-3, the component body 1-1 are hollow cylindrical structure, the top of the component body 1-1
Portion is equipped with fixed platform 1-1- of the bottom equipped with horizontal cross-section of force the platform 1-1-1, the component body 1-1 of horizontal cross-section
The front center of 2, the component body 1-1 offer the centers first through hole 1-3, the first through hole 1-3 and are equipped with and element sheet
Resonant chip 1-2 connected body 1-1.
As a preferred embodiment, in the structure size of the component body 1-1, hollow cylinder wall thickness is
4.75mm, outer diameter 14mm.
As a preferred embodiment, the cylinder fronts through component body 1-1 first through hole 1-3
The internal diameter at center, the first through hole is 8.7mm.
As a preferred embodiment, the thickness of the resonant chip 1-2 is 0.208mm, including stress piece 1-2-1
Extend at symmetrical both ends two panels connection sheet 1-2-2, the connection sheet 1-2-2 with connection sheet 1-2-2, the stress piece 1-2-1
It is seamlessly connected with the inner wall of first through hole 1-3.
It is deformed after the upper surface stress of total, power is transmitted in intermediate resonant chip, leads to resonant chip
The stress value size of node test corresponding transmission on node after surface applies external force on intermediate harmonic chip is chosen in deformation,
The linearity of the structure is evaluated, the results are shown in Figure 4 for force analysis, carries out finite element method and emulates to obtain such as Fig. 5 as a result, right
The numerical value answered is as follows：
| Force(N) | Stress(Pa) |
| 1000 | 16579572.70 |
| 1250 | 20724465.90 |
| 2500 | 41448931.80 |
| 5000 | 82897863.50 |
| 8000 | 132636582.00 |
| 10000 | 165795727.00 |
| 12000 | 198954872.00 |
| 15000 | 248693591.00 |
| 17500 | 290142522.00 |
Synthesis can show that the structure linearity is preferable in the embodiment, the biography of more generally square shaped design from the simulation result
Sensor nonlinearity erron reduces 1 times.
Embodiment 2：
The present embodiment makes following improvement on the basis of embodiment 1：
As a preferred embodiment, the connection sheet 1-2-2 maximum widths are less than stress piece 1-2-1 diameters.
As shown in Fig. 2, as a preferred embodiment, the amplifying circuit 7 includes resistance Rb1, resistance Rb2, electricity
Hinder Rc1, resistance Rc2, capacitance C1, variable capacitance C2, triode T1 and triode T2, one end of sensing element successively with can power transformation
Hold C2 and resistance Rc2 series connection and be followed by leading-out terminal Ec, the other end of sensing element respectively with one end of resistance Rb1 and triode T1
Base stage be connected, the other end of the resistance Rb1 is connected with capacitance C1 resistance Rb2 successively is followed by leading-out terminal V0, three pole
The emitter of pipe T1 and the emitter of triode T2 are grounded, and the collector of triode T1 is connected with resistance Rc1 is followed by output end
Sub- EC, the base stage and collector of the triode T2 are connected in parallel on the both ends of resistance Rb2.
Operation principle：Quartz crystal oscillator has piezoelectric effect, when applying pressure on crystal wafer, in some direction of crystal
Two sides just will produce charge, and a surface generates positive charge, and another surface generates negative electrical charge；If pressure is changed to tension
When (pulling force), then charge property is generated just on the contrary, this is direct piezoelectric effect., whereas if when crystal two sides adds voltage,
It just will produce the movement of extension or contraction, and this property is known as reciprocal piezoelectric effect.Since quartz crystal has reciprocal piezoelectric effect,
Under the action of alternating voltage, crystal will generating period mechanical oscillation, and because it have piezoelectric effect, making the period
Property mechanical oscillation when, and the cyclically-varying that crystal two sides charge property will be caused, so, it is sinusoidal just to form one in circuit
Alternating current i.The size of alternating current is the amplitude proportional with mechanical oscillation, namely with the amplitude of additional alternating voltage at
Direct ratio.The size of amplitude and alternating current that quartz crystal machinery shakes is related with the frequency of additional alternating voltage, when additional
When the frequency of alternating voltage is equal to the intrinsic frequency of crystal, the amplitude and alternating current of mechanical oscillation are all maximum, this phenomenon
The referred to as piezoelectric resonator of quartz crystal, it is equivalent to the series resonance in the circuits LC.Therefore, crystal oscillator can be equivalent to a LC string
The resonant tank of connection,
When external force acts on the edge of quartz wafer, the deformation of quartz wafer can be caused, its resonant frequency is hindered, lead
Eigenfrequency is caused to change；The size of external force can be calculated by the variable quantity of inspection frequency.
The above is only preferred embodiments of the present invention, it is noted that for the ordinary skill people of this field
For member, without departing from the concept of the premise utility, several modifications and improvements can also be made, these belong to practicality
Novel protection domain.
Claims (6)
1. a kind of cylindrical structure integral type resonance pressure sensor, including sensing element (1) and sensor main body (2), described
Sensor main body (2) includes pedestal (3), lead (4), bottom plate (5) and external connection (6), and the bottom plate (5) is equipped with amplifying circuit
(7), the sensing element (1) is fixed in pedestal (3), and the sensing element (1) and amplifying circuit (7) pass through lead (4) electricity
Connection, the external connection (6) are electrically connected with amplifying circuit (7), which is characterized in that the sensing element (1) is all by quartzy structure
At, including component body (1-1), resonant chip (1-2) and first through hole (1-3), the component body (1-1) they are hollow cylinder
Body structure, the top of the component body (1-1) are equipped with the force platform (1-1-1) of horizontal cross-section, the component body (1-1)
Bottom be equipped with the fixed platform (1-1-2) of horizontal cross-section, the front center of the component body (1-1) offers first through hole
(1-3), first through hole (1-3) center are equipped with the resonant chip (1-2) being connected with component body (1-1).
2. a kind of cylindrical structure integral type resonance pressure sensor according to claim 1, it is characterised in that：The member
In the structure size of part ontology (1-1), hollow cylinder wall thickness is 4.70~4.80mm, and outer diameter is 13mm~15mm.
3. a kind of cylindrical structure integral type resonance pressure sensor according to claim 1, it is characterised in that：Described
The internal diameter of one through-hole (1-3) cylinder front center through component body (1-1), the first through hole (1-3) is
8.5mm~9.0mm.
4. a kind of cylindrical structure integral type resonance pressure sensor according to claim 1, it is characterised in that：It is described humorous
The thickness of chip (1-2) of shaking is 0.200mm~0.210mm, including stress piece (1-2-1) and connection sheet (1-2-2), the stress
Extend two panels connection sheet (1-2-2), the connection sheet (1-2-2) and first through hole (1-3) in the symmetrical both ends of piece (1-2-1)
Inner wall is seamlessly connected.
5. a kind of cylindrical structure integral type resonance pressure sensor according to claim 4, it is characterised in that：The company
Contact pin (1-2-2) maximum width is less than stress piece (1-2-1) diameter.
6. a kind of cylindrical structure integral type resonance pressure sensor according to claim 1, it is characterised in that：It is described to put
Big circuit (7) includes resistance Rb1, resistance Rb2, resistance Rc1, resistance Rc2, capacitance C1, variable capacitance C2, triode T1 and three poles
Pipe T2, one end of sensing element is connected with variable capacitance C2 and resistance Rc2 successively is followed by leading-out terminal Ec, sensing element it is another
End is connected with the base stage of one end of resistance Rb1 and triode T1 respectively, the other end of the resistance Rb1 successively with capacitance C1 resistance
Rb2 series connection is followed by leading-out terminal V0, and the emitter of the triode T1 is grounded with the emitter of triode T2, triode T1's
Collector is connected with resistance Rc1 to be followed by the base stage and collector of leading-out terminal EC, the triode T2 and is connected in parallel on the two of resistance Rb2
End.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820590377.0U CN208060048U (en) | 2018-04-24 | 2018-04-24 | A kind of cylindrical structure integral type resonance pressure sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820590377.0U CN208060048U (en) | 2018-04-24 | 2018-04-24 | A kind of cylindrical structure integral type resonance pressure sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108267247A (en) * | 2018-04-24 | 2018-07-10 | 成都奥森泰科技有限公司 | A kind of cylindrical structure integral type resonance pressure sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108267247A (en) * | 2018-04-24 | 2018-07-10 | 成都奥森泰科技有限公司 | A kind of cylindrical structure integral type resonance pressure sensor |
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