CN216144833U - Improved triangular shear piezoelectric acceleration sensor - Google Patents
Improved triangular shear piezoelectric acceleration sensor Download PDFInfo
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- CN216144833U CN216144833U CN202120980527.0U CN202120980527U CN216144833U CN 216144833 U CN216144833 U CN 216144833U CN 202120980527 U CN202120980527 U CN 202120980527U CN 216144833 U CN216144833 U CN 216144833U
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- 230000001133 acceleration Effects 0.000 title claims abstract description 38
- 238000009413 insulation Methods 0.000 claims abstract description 26
- 239000000919 ceramic Substances 0.000 claims description 18
- 230000036316 preload Effects 0.000 claims description 12
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 239000010937 tungsten Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims 1
- 239000002184 metal Substances 0.000 claims 1
- 230000035945 sensitivity Effects 0.000 abstract description 8
- 230000004044 response Effects 0.000 abstract description 5
- 238000010008 shearing Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
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- 239000007787 solid Substances 0.000 description 1
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Abstract
The utility model relates to the technical field of piezoelectric acceleration sensors, in particular to an improved triangular shearing piezoelectric acceleration sensor which comprises a base, a piezoelectric element, a mass block, an insulating sheet, a conducting strip, a pre-tightening piece and a shell. The base comprises a supporting part and a regular triangular prism-shaped connecting part, and three side surfaces of the regular triangular prism are processed into a slope with gradient; the piezoelectric element is sleeved outside the connecting part, and a gap is formed between the piezoelectric element and the connecting part; the conducting strips are sleeved on the inner surface and the outer surface of the piezoelectric element without gaps; the mass block is sleeved on the conducting strip on the outer surface of the piezoelectric element without a gap; the insulating sheets are inserted into the gaps and are wedge-shaped blocks; the pre-tightening piece presses one end of the insulation sheet so that the insulation sheet provides radial pre-tightening force to fasten the conductive sheet, the piezoelectric element, the mass block and the base; the housing is disposed around the mass. The piezoelectric acceleration sensor is provided with a plurality of piezoelectric elements which are connected in parallel for output, so that the mass block is enlarged, the sensitivity of the piezoelectric acceleration sensor is increased, the piezoelectric elements are in rigid contact with other elements, and the frequency response characteristic and resonance of the piezoelectric acceleration sensor are improved.
Description
Technical Field
The utility model relates to the technical field of piezoelectric acceleration sensors, in particular to an improved triangular shearing piezoelectric acceleration sensor.
Background
The piezoelectric acceleration sensor is also called as a piezoelectric accelerometer, and also belongs to an inertial sensor. The principle of the piezoelectric acceleration sensor is that the piezoelectric effect of the piezoelectric element is utilized, and when the accelerometer is vibrated, the force of the mass block on the piezoelectric element is changed. When the measured vibration frequency is much lower than the natural frequency of the accelerometer, then the force change is directly proportional to the measured acceleration.
The piezoelectric acceleration sensor mainly has three main structural forms, namely a compression type acceleration sensor, a shear type acceleration sensor and a bending type acceleration sensor. The shear type piezoelectric acceleration sensor has simple structure, can be made into an extremely small accelerometer with high resonance frequency, and has wider application.
The special microseism monitoring sensor for preventing the mine water damage has the problems of low sensitivity, poor precision and the like, and the performance of the special microseism monitoring sensor cannot meet the accurate prediction and forecast of the mine water inrush event. Therefore, a piezoelectric acceleration sensor for micro-seismic monitoring, which has high sensitivity, high precision and quick response and is used for preventing and controlling water damage of a mine, is urgently needed.
Disclosure of Invention
The utility model provides an improved triangular shear piezoelectric acceleration sensor for overcoming the problems in the prior art.
An improved triangular shear piezoelectric acceleration sensor comprises a base, a piezoelectric element, a mass block, an insulating sheet, a conducting sheet, a preload piece and a shell. The base comprises a supporting part and a regular triangular prism-shaped connecting part positioned on the supporting part, a threaded hole formed by axially extending along the central axis of the connecting part is formed in the connecting part, and three side surfaces of the regular triangular prism are processed into a slope surface with gradient; the piezoelectric element is sleeved outside the connecting part, and a gap is formed between the piezoelectric element and the connecting part; the conducting strips are sleeved on the inner surface and the outer surface of the piezoelectric element without gaps; the mass block is sleeved on the conducting strip on the outer surface of the piezoelectric element without a gap; the insulation sheet is inserted into the gap, the insulation sheet is a wedge-shaped block, and one relatively thin end of the insulation sheet is close to the supporting part; the pre-tightening piece presses one end of the insulation sheet so that the insulation sheet provides radial pre-tightening force to fasten the conductive sheet, the piezoelectric element, the mass block and the base; the housing is disposed around the mass.
Preferably, the regular triangular prism-shaped connecting part of the base is of a stepped structure, three side surfaces of the first step are processed into slope surfaces, and the slope of each slope surface is 85 degrees; the connecting part is provided with a threaded hole formed by axially extending along the central axis of the connecting part, and the threaded hole is in threaded connection with the preload piece, so that the safety and the reliability are realized; the supporting part of the base further comprises an output socket and a threaded connection part connected with the shell, and is provided with a bottom threaded hole formed by axially extending along the central axis of the supporting part, so that the supporting part is fixedly connected with a measured object, and the measurement error caused by the connection problem is reduced.
Preferably, the piezoelectric element is PZT-5H piezoelectric ceramic, the piezoelectric element includes three piezoelectric ceramic pieces, conductive pieces forming good conductive connection with the inner and outer surfaces of the piezoelectric ceramic pieces are arranged on the inner and outer surfaces of the piezoelectric ceramic pieces, and the plurality of conductive pieces are connected in series and then are conductively connected with the core wire of the base output socket through a lead wire, so that the three piezoelectric ceramic pieces are output in parallel.
Preferably, the mass block is made of tungsten and has a cylindrical integral structure, and the middle hole is arranged corresponding to three side faces of the connecting part of the base.
Preferably, the insulation sheet is alumina insulation ceramic, the inner side surface of the insulation sheet is a slope surface, and the slope of the slope surface is 85 degrees.
Preferably, the size of the conducting strip is larger than or equal to that of the piezoelectric element, so that the piezoelectric element can be completely attached to the conducting strip; the conductive sheets may be separate structures electrically connected by the conductive wire segments, or may be an integral structure including a bonding portion and a connecting portion, so that the piezoelectric elements are output in parallel.
Preferably, pretension piece extrusion insulating piece provides the required radial force of cooperation between piezoelectric element and the conducting strip, insulating piece, quality piece and the base, is the rigid contact between piezoelectric element and conducting strip, insulating piece, quality piece and the base promptly, and joint strength is high, can effectual promotion charge output element's global rigidity, promotes piezoelectric acceleration sensor's frequency response characteristic and resonance then.
Preferably, the shell is arranged around the mass block and is in threaded connection with the base, so that the shell is safe and reliable, and the resonant frequency of the sensor is improved.
The improved triangular shear piezoelectric acceleration sensor has the advantages that:
(1) the utility model adopts a triangular shearing structure, when the acceleration sensor senses axial vibration, the piezoelectric element bears shear stress, the piezoelectric element is isolated from the base, the change of the stress of the base caused by load cannot influence the change of the piezoelectric element, the deformation of the base caused by transient temperature is well isolated, and the influence of the transient temperature on the piezoelectric element is effectively compensated. The stability of the frequency response and the transverse sensitivity of the triangular shearing piezoelectric acceleration sensor is ensured, and the accuracy of a detection result is further ensured.
(2) The utility model changes the original three separated mass blocks into a whole, thereby increasing the mass of the mass block and improving the sensitivity of the sensor.
(3) According to the utility model, the piezoelectric elements are arranged on three side surfaces of the connecting part of the base, so that the space is fully utilized, and the piezoelectric elements are arranged in parallel, so that the sensitivity of the charge output element can be increased, and further, the sensitivity of the piezoelectric acceleration sensor is increased.
(4) The utility model discloses a method for pre-tightening a base, an insulating sheet, a conducting sheet, a piezoelectric element and a mass block by pressing the insulating sheet by a pre-tightening piece, wherein the pre-tightening radial force can be adjusted by adjusting the rotation angle of the pre-tightening piece, so that the vibration acceleration which can be borne by a piezoelectric acceleration sensor can be adjusted.
Drawings
FIG. 1 is a schematic structural diagram of a piezoelectric acceleration sensor according to an embodiment of the present invention;
FIG. 2 is a schematic plane structure diagram of a piezoelectric acceleration sensor according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a base according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a mass according to an embodiment of the present invention;
fig. 5 is a schematic structural view of a conductive sheet according to an embodiment of the present invention;
in the figure: 1. a base; 2. a housing; 3. a mass block; 4. a conductive sheet; 5. a piezoelectric element; 6. an insulating sheet; 7. pre-tightening piece; 11. a base output socket; 12. a base support portion; 13. a base threaded connection; 14. a base regular triangular prism-shaped connecting part; 31. an inner surface of the mass; 32. an outer surface of the mass block; 41. a conductive sheet connecting portion; 42. a conductive sheet attaching part.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An improved triangular shear piezoelectric acceleration sensor comprises a base 1, a piezoelectric element 5, a mass block 3, an insulating sheet 6, a conducting sheet 4, a preload piece 7 and a shell 2. The base 1 comprises a supporting part 12 and a regular triangular prism-shaped connecting part 14 positioned on the supporting part, wherein a threaded hole formed by axially extending along the central axis of the connecting part is formed in the connecting part 14, and three side surfaces of the regular triangular prism are processed into a slope surface with gradient; the piezoelectric element 5 is sleeved outside the connecting part, and a gap is formed between the piezoelectric element and the connecting part; the conducting strip 4 is sleeved on the inner surface and the outer surface of the piezoelectric element 5 without a gap; the mass block 3 is sleeved on the conducting strip 4 on the outer surface of the piezoelectric element 5 without a gap; the insulating sheet 6 is inserted into the gap, the insulating sheet is a wedge-shaped block, and one relatively thin end of the insulating sheet is close to the supporting part; the pre-tightening piece 7 presses one end of the insulation sheet to enable the insulation sheet to provide radial pre-tightening force to fasten the conducting sheet, the piezoelectric element, the mass block and the base; the housing 2 is arranged around the mass.
The regular triangular prism-shaped connecting part 14 of the base 1 is of a step-shaped structure, three side surfaces of the first step are processed into slope surfaces, the slope of each slope surface is 85 degrees, and the slope surfaces extrude the insulating sheets, so that radial pre-tightening force is provided; the connecting part is provided with a threaded hole formed by axially extending along the central axis of the connecting part, and the threaded hole is in threaded connection with the preload piece 7, so that the safety and the reliability are realized; the support part 12 of the base further comprises an output socket 11 and a threaded connection part 13 connected with the shell, and is provided with a bottom threaded hole formed by axially extending along the central axis of the support part, and the bottom threaded hole is used for being fixedly connected with a measured object, so that the measurement error caused by the connection problem is reduced.
Preferably, the piezoelectric element 5 is PZT-5H piezoelectric ceramic, the piezoelectric element includes three piezoelectric ceramic pieces, conductive pieces 4 forming good conductive connection with the inner and outer surfaces of the piezoelectric ceramic pieces are arranged on the inner and outer surfaces of the piezoelectric ceramic pieces, and the plurality of conductive pieces are connected in series and then are conductively connected with the core wire of the base output socket 11 through a lead wire, so that the three piezoelectric ceramic pieces are output in parallel. And the sensitivity of the charge output element can be increased by connecting a plurality of piezoelectric ceramic plates in parallel, and the anti-interference capability of the charge output element is improved.
Preferably, the mass block 3 is made of tungsten and has a cylindrical integral structure, and the middle hole is arranged corresponding to three side surfaces of the connecting part of the base.
Preferably, the insulation sheet 6 is alumina insulation ceramic, the inner side surface of the insulation sheet is a slope surface, and the slope of the slope surface is 85 degrees, so that the thickness of one end of the insulation sheet is greater than that of the other end. The insulation sheet 6 is sleeved on the base connecting portion 14 and located between the connecting portion 14 and the conductive sheet 4. The arrangement of the insulation sheet 6 can prevent the electric charge of the piezoelectric assembly from moving to the base connecting part 11, and further can improve the measurement accuracy of the piezoelectric acceleration sensor.
Preferably, the size of the attaching part 42 of the conductive sheet 4 is larger than or equal to that of the piezoelectric element, so that the piezoelectric element can be completely attached to the conductive sheet; the conductive sheets may be separate structures and electrically connected by wire segments, or may be an integral structure including the bonding portion 42 and the connecting portion 41, so that the piezoelectric elements are output in parallel.
Preferably, preload piece 7 includes interconnect's column portion and backstop portion, and each above-mentioned component of mounting hole cooperation lock solid is gone up with regular triangular prism to column portion, backstop portion extrusion insulating piece 5 one end to make the insulating piece provide radial pretightning force fastening base 1, quality piece 3, conducting strip 4 and piezoelectric element 5, be rigid contact between piezoelectric element and conducting strip, insulating piece, quality piece and the base promptly, joint strength is high, can effectually promote charge output element's bulk rigidity, promote piezoelectric acceleration sensor's frequency response characteristic and resonance then. The preload piece 7 is subjected to heat treatment before being connected with the mounting hole, and the heat treatment is favorable for improving the mechanical property of the preload piece 7 and preventing deformation in the process of screwing the preload piece 7.
Preferably, the housing 2 is arranged around the mass block 3 and is in threaded connection with the base, so that the safety and the reliability are realized, and the resonant frequency of the sensor is improved.
While the utility model has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the utility model. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the utility model not be limited to the particular embodiments disclosed, but that the utility model will include all embodiments falling within the scope of the appended claims.
Claims (6)
1. An improved triangular shear piezoelectric acceleration sensor, comprising: the device comprises a base (1), a piezoelectric element (5), a mass block (3), an insulating sheet (6), a conducting sheet (4), a preload piece (7) and a shell (2); the base (1) comprises a supporting part (12) and a regular triangular prism-shaped connecting part (14) positioned on the supporting part, wherein a threaded hole formed by axially extending along the central axis of the connecting part is formed in the connecting part (14), and three side surfaces of the regular triangular prism are processed into a slope surface with gradient; the piezoelectric element (5) is sleeved outside the connecting part, and a gap is formed between the piezoelectric element and the connecting part; the conducting strips (4) are sleeved on the inner surface and the outer surface of the piezoelectric element (5) without gaps; the mass block (3) is sleeved on the conducting strip (4) on the outer surface of the piezoelectric element (5) without a gap; the insulation sheet (6) is inserted into the gap, the insulation sheet is a wedge-shaped block, and one relatively thin end of the insulation sheet is close to the supporting part; the pre-tightening piece (7) presses one end of the insulation sheet to enable the insulation sheet to provide radial pre-tightening force to fasten the conductive sheet, the piezoelectric element, the mass block and the base; the housing (2) is arranged around the mass block.
2. The improved triangular shear piezoelectric acceleration sensor according to claim 1, characterized in that the regular triangular prism-shaped connecting part (14) of the base (1) is a step-shaped structure, three side surfaces of the first step are processed into slope surfaces, and the slope of the slope surfaces is 85 degrees; the connecting part is provided with a threaded hole formed by axially extending along the central axis of the connecting part and is in threaded connection with the preload piece (7); the supporting part (12) of the base further comprises an output socket (11) and a threaded connecting part (13) connected with the shell, and is provided with a bottom threaded hole formed by axially extending along the central axis of the supporting part.
3. The improved triangular shear piezoelectric acceleration sensor according to claim 2, characterized in that the piezoelectric element (5) is PZT-5H piezoelectric ceramic, the piezoelectric element comprises three piezoelectric ceramic plates, the inner and outer surfaces of the piezoelectric ceramic plates are provided with conductive plates (4) in good conductive connection therewith, and the plurality of conductive plates are connected in series and then conductively connected with the core wire of the base output socket (11) through a lead wire, so that the three piezoelectric ceramic plates are output in parallel.
4. The improved triangular shear piezoelectric acceleration sensor of claim 1, characterized in that the mass block (3) is made of metal tungsten and has a cylindrical integral structure, and the middle hole is arranged corresponding to three sides of the base connecting part.
5. The improved triangular shear piezoelectric acceleration sensor of claim 1, wherein the insulation sheet (6) is alumina insulation ceramic, the inner side surface of the insulation sheet is a slope surface, and the slope of the slope surface is 85 degrees.
6. An improved triangular shear piezoelectric acceleration sensor according to claim 1, characterized in that the preload element (7) comprises interconnected columns and stops, the columns cooperating with the threaded holes of the regular triangular prism, the stops pressing against one end of the insulating sheet (6) so that the sheet provides a radial preload force to fasten the base (1), the mass (3), the conductive sheet (4) and the piezoelectric element (5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120980527.0U CN216144833U (en) | 2021-05-10 | 2021-05-10 | Improved triangular shear piezoelectric acceleration sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120980527.0U CN216144833U (en) | 2021-05-10 | 2021-05-10 | Improved triangular shear piezoelectric acceleration sensor |
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| CN216144833U true CN216144833U (en) | 2022-03-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113176422A (en) * | 2021-05-10 | 2021-07-27 | 河北工程大学 | Triangular shear type charge output element, piezoelectric acceleration sensor and assembling method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113176422A (en) * | 2021-05-10 | 2021-07-27 | 河北工程大学 | Triangular shear type charge output element, piezoelectric acceleration sensor and assembling method |
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Granted publication date: 20220329 |