CN203798824U - Isolation type bending piezoelectric acceleration machine core - Google Patents
Isolation type bending piezoelectric acceleration machine core Download PDFInfo
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- CN203798824U CN203798824U CN201420164975.3U CN201420164975U CN203798824U CN 203798824 U CN203798824 U CN 203798824U CN 201420164975 U CN201420164975 U CN 201420164975U CN 203798824 U CN203798824 U CN 203798824U
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Abstract
Disclosed in the utility model is an isolation type bending piezoelectric acceleration machine core comprising a housing, an upper inertia body, a lower inertia body, and a electro-mechanical transformation system. The upper inertia body, the lower inertia body, and the electro-mechanical transformation system are arranged in the housing; and masses of the upper inertia body and the lower inertia body are identical. The upper inertia body includes a first insulating pad and a compression nut; and the lower inertia body includes a circular plate-shaped metal pedestal. The electro-mechanical transformation system includes a metal center shaft, an insulation sleeve, a negative outgoing line, and at least one piezoelectric ceramic unit; and the piezoelectric ceramic unit includes a positive outgoing line. A connecting column with an external thread is arranged at the bottom of the housing. A lead hole is formed in the housing; an insulator or an insulated sealed medium for sealing the housing is arranged in the lead hole; and the positive outgoing line and the negative outgoing line are electrically connected with the external world by the insulator or by penetrating the insulated sealed medium. According to the scheme, the provided machine core is capable of suppressing the electrical interference and the mechanical interference.
Description
Technical field
The utility model relates to a kind of movement of earthquake physical prospecting wave detector, relates in particular to a kind of isolated flexure type piezoelectric acceleration movement.
Background technology
Signal to noise ratio (S/N ratio) is to determine that a kind of wave detector extracts a key parameter of signal capabilities, is to ensure signal to noise ratio (S/N ratio) essential condition and how to suppress to disturb, and our common conflicting mode mainly divides two kinds, the one, and electromagnetic interference (EMI), another kind is that mechanical vibration are disturbed, and with regard to electromagnetic interference (EMI), solution is more direct, is mainly by the method for shielding, and electromagnetic interference (EMI) and signal source are kept apart, and reaches the effect of inhibition, and the inhibition that machinery is disturbed, relatively with regard to more complicated, because wave detector does not have the ability of Intelligent Recognition, cannot distinguish effective and invalid signals, therefore the method solving just can not be isolated entirely, and must be the path of the path of useful signal and interference respectively to pending, the main method adopting is, by structural design and optimization of material, useful signal can be obtained to greatest extent to be extracted, suppressed to greatest extent and disturb, simultaneously, piezoelectric ceramic piece is also very responsive on the impact of humidity, sharply variation of piezoelectric ceramic piece electrical property after making moist, antijamming capability reduces rapidly, cause signal to noise ratio (S/N ratio) to reduce, therefore, bending-type piezoelectricity movement exists not enough separately at present.
Chinese patent ZL.200820030163.4 discloses a kind of bended piezoelectric acceleration sensor, the movement of this wave detector does not adopt isolated structure, but the protective case of the shell of piezoelectricity movement and sensor is shared, because disturbing, the machinery from space imports piezoelectricity movement into by protective case, therefore the non-constant of mechanical interference suppressioning effect that makes piezoelectricity movement import into space, thereby make the signal to noise ratio (S/N ratio) of sensor very low, electromagnetic interference (EMI) is not adopted to full-closed structure simultaneously, electrical interference is suppressed to be open loop situations, in addition movement does not seal independence, sealed damp-proof effect is also bad.
Chinese patent zl.201120534441.1 discloses the bending piezoelectric acceleration sensor frame of a kind of physical property type and sensor thereof, although the piezoelectricity movement of sensor has adopted sealing independent mode, but between piezoelectricity movement and wave detector protective shell, be to be connected by the screw thread of piezoelectricity movement outer radius portion, this just makes Medium-voltage Motor core diameter to becoming one with wave detector protective shell, this larger area is threaded, can make equally space mechanism disturb and pass to easily movement, the signal to noise ratio (S/N ratio) of movement is reduced, because only having aluminium, shell shields simultaneously, also bad to the inhibition of electromagnetic interference (EMI), sealed damp-proof effect is also bad, thereby make wave detector general stability variation.
In sum, existing wave detector all not can solve the inhibition of piezoelectricity movement to electromagnetism and machinery interference, thereby easily causes the signal to noise ratio (S/N ratio) of wave detector to reduce, bad stability, and these factors all can directly have influence on the quality of wave detector.
Utility model content
The utility model provides a kind of isolated flexure type piezoelectric acceleration movement that can suppress electrical interference and machinery interference.
Technical solution of the present utility model is:
An isolated flexure type piezoelectric acceleration movement, comprises shell, and upper coasting body, lower coasting body and Electromechanical Switching System are in the enclosure set;
Its special character is:
The quality of described upper coasting body and lower coasting body equates; Upper coasting body comprises the first insulating mat, gland nut; Lower coasting body comprises collar plate shape metab; Electromechanical Switching System comprises metal center axle, insulation sleeve, negative extension line and at least one piezoelectric ceramics unit;
The lower end of metal center axle and collar plate shape metab are connected, and on metal center axle, cover has the first insulating mat and at least one piezoelectric ceramics unit from top to bottom, is pressed on downwards on collar plate shape metab by gland nut;
Described insulation sleeve is arranged at the socket position of piezoelectric ceramics unit on metal center axle;
Described piezoelectric ceramics unit comprises positive extension line, metal substrate, is arranged on metal substrate upper surface middle part, the piezoelectric ceramics at lower surface middle part, be arranged on the conducting strip of one of them piezoelectric ceramics outside surface; Described positive extension line one end is electrically connected with conducting strip, and described negative extension line is electrically connected with metal center axle;
Described outer casing bottom is provided with is with externally threaded joint pin, on described shell, be provided with fairlead, in fairlead, be provided with can insulator or insulated enclosure medium, described positive extension line and negative extension line by insulator with outside be electrically connected or passes on insulated enclosure medium be electrically connected with outside;
The quantity of piezoelectric ceramics unit is 1, and the SI semi-insulation that metal substrate is exposed at outside piezoelectric ceramics is fixed on the madial wall of shell; Or the quantity of piezoelectric ceramics unit is greater than 1, the positive extension line of each piezoelectric ceramics unit serial connection, each metal substrate is exposed at part outside piezoelectric ceramics and insulate respectively and be fixed on the madial wall of shell.
Based on technique scheme, the utility model is also made following optimization and is also limited:
Above-mentioned shell is double-level-metal shell, and the internal layer of this double-level-metal shell is that aluminum hull, skin are iron-clad.
Above-mentioned metal substrate be shaped as circle, ellipse or rectangle, circular.
If the height of piezoelectric ceramics unit is L, position corresponding to L/2 eminence is mid point;
Described the first insulating mat, gland nut, be positioned at metal center axle more than mid point and the quality that is positioned at more than mid point conducting strip and collar plate shape metab, is positioned at the metal center axle below mid point and is positioned at the conducting strip below mid point equates.
Above-mentioned piezoelectric ceramics unit has multiple, shell comprise be provided with interior step lower house, and the jam nut that is spirally connected of lower house medial surface, be arranged on the multiple insulators between step and jam nut lower surface in lower house, the part that each metal substrate is exposed at outside piezoelectric ceramics is separately positioned between multiple insulators; Described multiple insulator is for the insulation between metal substrate and between metal substrate and lower house.
Above-mentioned upper coasting body also comprises the packing washer being arranged between the first insulating mat and gland nut.
The quantity of above-mentioned piezoelectric ceramics unit is less than 30.
Above-mentioned insulated enclosure medium is fluid sealant.
Above-mentioned metal substrate is copper base.
The utility model has the advantages that:
1, the quality of upper coasting body of the present utility model and lower coasting body equates, the unequal natural bow of bringing of quality that has solved upper coasting body and lower coasting body becomes large;
2, anti-mechanical interference performance is strong: physical prospecting wave detector is coupled with earth's surface, for receiving from underground reflected signal, therefore, we can think: the afferent pathway of useful signal, the just bottom of wave detector lower house, and the signal that other paths are imported into should be undesired signal, the part that movement of the present utility model is connected with protective case only has the joint pin of movement bottom, other parts and protective case form gap, keep a kind of isolation, make these paths import movement signal energy into and greatly weaken, thereby reach the effect of machinery being disturbed to inhibition and decay;
3, effectiveness is good: because movement has adopted aluminium and the sealing of iron double-level-metal, therefore, must play good shielding action to the electromagnetic interference (EMI) from space;
4, piezoelectric ceramics moisture resistance is good: totally enclosed metal shell structure, movement positive and negative lead wires hole is sealed with insulated enclosure medium, piezoelectric ceramics is isolated from the outside, prevent that ambient temperature from changing the impact on piezoelectric ceramics, reduce cost, kept stability to be highly profitable to movement of the present utility model.
Brief description of the drawings
Fig. 1 is cross-sectional view of the present utility model;
Fig. 2 is the application schematic diagram of the utility model in wave detector;
Fig. 3 is the vertical view that is provided with the metal substrate of piezoelectric ceramics.
Reference numeral:
1-jam nut; 2-gland nut; 3-packing washer; 4-the first insulating mat; 5-conducting strip; 6-piezoelectric ceramics; 7-the second insulating mat; 8-metal center axle; 9-insulation sleeve; 10-lower house; 11-insulated liner; 12-the 3rd insulating mat; 13-insulator, the positive extension line of 14-; 15-bears extension line; 16-joint pin; 18-shell; 19-movement; 20-protective case; 21-metal substrate.
Embodiment
The utility model provides a kind of isolated flexure type piezoelectric acceleration movement, as shown in Figure 1, comprises shell 18, and upper coasting body, lower coasting body and Electromechanical Switching System are in the enclosure set.The quality of upper coasting body and lower coasting body is equal, and upper coasting body comprises the first insulating mat 4, gland nut 2; Lower coasting body comprises collar plate shape metab; Electromechanical Switching System comprises metal center axle 8, insulation sleeve 9, negative extension line 15 and at least one piezoelectric ceramics unit.
As depicted in figs. 1 and 2, outer casing bottom is provided with is with externally threaded joint pin 16, movement 19 is connected by this joint pin and protective case 20 to be connected, after being connected, only be connected by joint pin and the protective case of outer casing bottom, other parts between shell and this protective case do not contact and form gap, isolated between the shell of maintenance movement and protective case, make these paths import movement signal energy into and greatly weaken, thereby reach the effect of machinery being disturbed to inhibition and decay.
It is aluminum hull, the outer double-level-metal shell for iron-clad that shell can adopt internal layer.Because aluminum hull has good shield effectiveness to electrical interference, iron-clad has good shielding action to magnetic interference, thereby employing internal layer is aluminum hull, the outer double-level-metal shell for iron-clad, can better shield the electromagnetic interference (EMI) from space.
The lower end of metal center axle and collar plate shape metab are connected, and on metal center axle, cover has the first insulating mat and at least one piezoelectric ceramics unit from top to bottom, is pressed on downwards on collar plate shape metab by gland nut; Described insulation sleeve is arranged at the socket position of piezoelectric ceramics unit on metal center axle; Can avoid the metal substrate of different piezoelectric ceramics unit to be short-circuited.For the unequal natural bow of bringing of quality that solves upper coasting body and lower coasting body becomes large, the quality of upper coasting body of the present utility model and lower coasting body equates.
Piezoelectric ceramics unit comprises positive extension line 14, metal substrate 21, is arranged on metal substrate upper surface middle part, the piezoelectric ceramics 6 at lower surface middle part, and metal substrate can adopt copper base.Metal substrate be shaped as circle, ellipse or rectangle, circular (as Fig. 3).In order to make to connect between different piezoelectric ceramics conducting, on one of them piezoelectric ceramics of metal substrate, be provided with conducting strip 5, the quantity of piezoelectric ceramics unit is 1, the SI semi-insulation that metal substrate is exposed at outside piezoelectric ceramics is fixed on the madial wall of shell; Or the quantity of piezoelectric ceramics unit is greater than 1, the positive extension line of each piezoelectric ceramics unit serial connection, each metal substrate is exposed at part outside piezoelectric ceramics and insulate respectively and be fixed on the madial wall of shell.
Positive extension line one end is electrically connected with conducting strip, the positive extension line serial connection of different piezoelectric ceramics unit, and negative extension line is electrically connected with metal center axle; On shell, be provided with fairlead, be provided with insulator 13 or the insulated enclosure medium of insulated enclosure shell in fairlead, positive extension line and negative extension line are electrically connected or are electrically connected with outside through on insulated enclosure medium with outside by insulator.
If the height of piezoelectric ceramics unit is L, position corresponding to L/2 eminence is mid point.For the unequal natural bow of bringing of quality that further solves upper coasting body and lower coasting body becomes large technical matters, the first insulating mat, gland nut, be positioned at metal center axle more than mid point and the quality that is positioned at more than mid point conducting strip and collar plate shape metab, is positioned at the metal center axle below mid point and is positioned at the conducting strip below mid point equates.。
In order to assemble more easily the utility model, insulated enclosure medium can adopt fluid sealant, after movement of the present utility model has assembled, with insulated enclosure Filled Dielectrics fairlead, just can make movement inside come with external isolation, make the totally enclosed frame that becomes of shell.
The quantity of piezoelectric ceramics of the present utility model unit is preferably multiple, shell comprise be provided with interior step lower house 10, and the jam nut 1 that is spirally connected of lower house medial surface, be arranged on the multiple insulators between step and jam nut lower surface in lower house, the part that each metal substrate is exposed at outside piezoelectric ceramics is separately positioned between multiple insulators; Multiple insulators are for the insulation between metal substrate and between metal substrate and lower house.
Wherein, upper coasting body also comprises the packing washer 3 being arranged between the first insulating mat and gland nut; due to the wearing and tearing that gland nut can cause the first insulating mat in rotary course, packing washer can prevent that gland nut from directly contacting with the first insulating mat, protected the first insulating mat.The quantity of piezoelectric ceramics unit can be 1-30.Insulator comprises the second insulating mat 7, the 3rd insulating mat 12 and insulated liner 11, the second insulating mat directly contacts with the lower surface of jam nut, the 3rd insulating mat and insulated liner are positioned at the lower surface of the second insulating mat, insulated liner is arranged between the 3rd insulating mat and shell, always, the metal substrate of adjacent piezoelectric ceramics unit is exposed between the part outside piezoelectric ceramics by the 3rd insulating mat electrical isolation the quantity of the 3rd insulating mat and piezoelectric ceramics unit; Metal substrate is exposed between part outside piezoelectric ceramics and lower house and is insulated liner electrical isolation.
Claims (10)
1. an isolated flexure type piezoelectric acceleration movement, comprises shell, and upper coasting body, lower coasting body and Electromechanical Switching System are in the enclosure set;
It is characterized in that:
The quality of described upper coasting body and lower coasting body equates; Upper coasting body comprises the first insulating mat, gland nut; Lower coasting body comprises collar plate shape metab; Electromechanical Switching System comprises metal center axle, insulation sleeve, negative extension line and at least one piezoelectric ceramics unit;
The lower end of metal center axle and collar plate shape metab are connected, and on metal center axle, cover has the first insulating mat and at least one piezoelectric ceramics unit from top to bottom, is pressed on downwards on collar plate shape metab by gland nut;
Described insulation sleeve is arranged at the socket position of piezoelectric ceramics unit on metal center axle;
Described piezoelectric ceramics unit comprises positive extension line, metal substrate, is arranged on metal substrate upper surface middle part, the piezoelectric ceramics at lower surface middle part, be arranged on the conducting strip of one of them piezoelectric ceramics outside surface; Described positive extension line one end is electrically connected with conducting strip, and described negative extension line is electrically connected with metal center axle;
Described outer casing bottom is provided with is with externally threaded joint pin, on described shell, be provided with fairlead, in fairlead, be provided with can insulator or insulated enclosure medium, described positive extension line and negative extension line by insulator with outside be electrically connected or passes on insulated enclosure medium be electrically connected with outside;
The quantity of piezoelectric ceramics unit is 1, and the SI semi-insulation that metal substrate is exposed at outside piezoelectric ceramics is fixed on the madial wall of shell; Or the quantity of piezoelectric ceramics unit is greater than 1, the positive extension line of each piezoelectric ceramics unit serial connection, each metal substrate is exposed at part outside piezoelectric ceramics and insulate respectively and be fixed on the madial wall of shell.
2. isolated flexure type piezoelectric acceleration movement according to claim 1, is characterized in that:
Described shell is double-level-metal shell, and the internal layer of this double-level-metal shell is that aluminum hull, skin are iron-clad.
3. isolated flexure type piezoelectric acceleration movement according to claim 2, is characterized in that:
Described metal substrate be shaped as circle, ellipse or rectangle.
4. isolated flexure type piezoelectric acceleration movement according to claim 3, is characterized in that:
Described metal substrate be shaped as circle.
5. according to the isolated flexure type piezoelectric acceleration movement described in claim 1 or 2 or 3 or 4, it is characterized in that:
If the height of piezoelectric ceramics unit is L, position corresponding to L/2 eminence is mid point;
Described the first insulating mat, gland nut, be positioned at metal center axle more than mid point and the quality that is positioned at more than mid point conducting strip and collar plate shape metab, is positioned at the metal center axle below mid point and is positioned at the conducting strip below mid point equates.
6. isolated flexure type piezoelectric acceleration movement according to claim 5, it is characterized in that: described piezoelectric ceramics unit has multiple, shell comprise be provided with interior step lower house, and the jam nut that is spirally connected of lower house medial surface, be arranged on the multiple insulators between step and jam nut lower surface in lower house, the part that each metal substrate is exposed at outside piezoelectric ceramics is separately positioned between multiple insulators; Described multiple insulator is for the insulation between metal substrate and between metal substrate and lower house.
7. isolated flexure type piezoelectric acceleration movement according to claim 6, is characterized in that: described upper coasting body also comprises the packing washer being arranged between the first insulating mat and gland nut.
8. isolated flexure type piezoelectric acceleration movement according to claim 7, is characterized in that: the quantity of described piezoelectric ceramics unit is less than 30.
9. isolated flexure type piezoelectric acceleration movement according to claim 8, is characterized in that: described insulated enclosure medium is fluid sealant.
10. isolated flexure type piezoelectric acceleration movement according to claim 9, is characterized in that: described metal substrate is copper base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420164975.3U CN203798824U (en) | 2014-04-04 | 2014-04-04 | Isolation type bending piezoelectric acceleration machine core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420164975.3U CN203798824U (en) | 2014-04-04 | 2014-04-04 | Isolation type bending piezoelectric acceleration machine core |
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| Publication Number | Publication Date |
|---|---|
| CN203798824U true CN203798824U (en) | 2014-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420164975.3U Expired - Fee Related CN203798824U (en) | 2014-04-04 | 2014-04-04 | Isolation type bending piezoelectric acceleration machine core |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105223606A (en) * | 2015-09-06 | 2016-01-06 | 中国科学院地质与地球物理研究所 | Land piezoelectric seismometer core body |
| CN106383246A (en) * | 2016-09-08 | 2017-02-08 | 北方电子研究院安徽有限公司 | Mini-type speedometer structure |
| WO2018224036A1 (en) * | 2017-06-09 | 2018-12-13 | 西人马（厦门）科技有限公司 | Three-axis piezoelectric sensor |
| CN109632079A (en) * | 2018-12-07 | 2019-04-16 | 苏州长风航空电子有限公司 | A kind of metallic shield lead cover, piezoelectric transducer and lead method |
-
2014
- 2014-04-04 CN CN201420164975.3U patent/CN203798824U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105223606A (en) * | 2015-09-06 | 2016-01-06 | 中国科学院地质与地球物理研究所 | Land piezoelectric seismometer core body |
| CN106383246A (en) * | 2016-09-08 | 2017-02-08 | 北方电子研究院安徽有限公司 | Mini-type speedometer structure |
| CN106383246B (en) * | 2016-09-08 | 2018-12-28 | 北方电子研究院安徽有限公司 | A kind of small-sized arrangements of accelerometers |
| WO2018224036A1 (en) * | 2017-06-09 | 2018-12-13 | 西人马（厦门）科技有限公司 | Three-axis piezoelectric sensor |
| US11162973B2 (en) | 2017-06-09 | 2021-11-02 | Fatri Unied Testing & Control (Quanzhou) Technologies Co., Ltd. | Three-axis piezoelectric accelerometer |
| CN109632079A (en) * | 2018-12-07 | 2019-04-16 | 苏州长风航空电子有限公司 | A kind of metallic shield lead cover, piezoelectric transducer and lead method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140827 Termination date: 20200404 |