CN212111478U - Piezoelectric acceleration sensor for integrated instrument - Google Patents
Piezoelectric acceleration sensor for integrated instrument Download PDFInfo
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- CN212111478U CN212111478U CN202021176068.2U CN202021176068U CN212111478U CN 212111478 U CN212111478 U CN 212111478U CN 202021176068 U CN202021176068 U CN 202021176068U CN 212111478 U CN212111478 U CN 212111478U
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Abstract
The utility model discloses an integral type is piezoelectric acceleration sensor for instrument, including sensor housing, sensor housing's lock nut fixes sensor housing on the instrument, be equipped with sensor centrum and signal conditioning board in the sensor housing, sensor centrum upper end stretches out sensor housing upper port, sensor centrum lower pot head has the inertial mass ring, be equipped with annular piezoceramics between inertial mass ring and the sensor centrum lower extreme, the annular piezoceramics signal is drawn forth through inertial mass ring and sensor centrum and is connected to signal conditioning board, the signal is drawn forth from sensor housing lower port through the signal line, sensor centrum axle is equipped with the flange, the clamp sleeve inwards injects sensor housing lower port, the back plug screw that compresses tightly of clamp sleeve is fixed with sensor housing lower port threaded connection, the flange upper and lower extreme of sensor centrum axle is equipped with elasticity "O" type rubber ring. The sensor has high sensitivity, and the frequency response performance of the sensor is better than the matching performance of an instrument.
Description
Technical Field
The utility model relates to an integral type is piezoelectricity acceleration sensor for instrument.
Background
The acceleration sensor for the integral type instrument is that the sensor fastens on the instrument shell, directly contacts the sensor head on the instrument with measurand during the use to exert pressure on the instrument, with instrument and sensor perpendicular to measurand surface pressure on measurand surface, there is sensitivity poor at present, the problem that pressure is difficult to control, for example: the sensor and the measured object are easy to collide due to poor contact when the pressure is too small, and the original vibration of the measured object can be changed due to too large pressure. There are also problems: when the vibration acceleration of the tested object is transmitted to the sensor, the sensor shell is connected with the instrument shell, so that the resonance quality of the test instrument system is improved. If the sensor body and the sensor shell are rigidly connected into a whole, the instrument can reduce the frequency response range due to the improvement of the mass of the instrument.
Disclosure of Invention
The utility model provides an integral type is piezoelectricity acceleration sensor for instrument, sensor sensitivity is high, and the frequency response performance of sensor is better with the matching performance of instrument, and the instrument debugging and the production and processing of being convenient for, reduce cost.
In order to achieve the above object, the present invention provides a technical solution:
a piezoelectric acceleration sensor for an integrated instrument comprises a sensor shell, wherein a locking nut is arranged on the sensor shell and used for fixing the sensor shell on the instrument, a sensor central body and a signal conditioning plate are arranged in the sensor shell, the upper end of the sensor central body extends out of an upper port of the sensor shell and is used for being in contact with a measured body, an inertial mass ring is sleeved on the lower end side of the sensor central body, annular piezoelectric ceramics are arranged between the inertial mass ring and the side wall of the lower end side of the sensor central body, charge signals with different polarities are generated on the inner side and the outer side of the annular piezoelectric ceramics under the action of inertial shearing force and are led out and connected to the signal conditioning plate through the inertial mass ring and the sensor central body, the signals processed by the signal conditioning plate are led out from the lower port of the sensor shell through a signal wire, a convex flange is outwards arranged, the sensor central body is fixedly positioned by rotating the compression plug to push the compression sleeve to upwards push against a flange of the sensor central body, and elastic O-shaped rubber rings are respectively arranged between the flange of the sensor central body and the upper port of the sensor housing and between the flange of the sensor central body and the upper end face of the compression sleeve.
The proposal is further that the upper end surface of the axial middle section of the sensor central body, which protrudes outwards, is an annular conical surface from outside to inside upwards, and the lower end surface which protrudes outwards is a right-angle plane.
Further, the annular conical surface is an annular conical surface with an upward horizontal included angle of 30 degrees.
The scheme is further that a vibration pickup probe rod is arranged at the upper end of the sensor central body, the head of the vibration pickup probe rod is in a circular arc shape, and the vibration pickup probe rod is fixedly connected with the upper end of the sensor central body through threads.
The scheme is further that the signal conditioning plate is fixed between the compression plug and the compression sleeve through the compression plug.
The scheme is further that the central body of the sensor and the annular piezoelectric ceramics and the inertial mass ring are respectively bonded and fixed by conductive silver adhesive.
The scheme is further that a blind hole is formed in the outer side face of the bottom face of the sensor pressing plug, and the blind hole is located in the left side and the right side of the central through hole and used for inserting a tool to adjust the tightness of a pressing elastic O-shaped rubber ring of the pressing sleeve.
The utility model discloses an useful part: because be equipped with elastic support the utility model discloses a sensitivity that high frequency impact type signal was experienced to sensor center body subassembly is higher than the sensor that inelastic supported, and the sensor compresses tightly the internal thread that plug and sensor housing afterbody and closes soon, can adjust the moment that closes soon in the small range for the frequency response performance of sensor is better with the matching performance of instrument, and the instrument debugging and the production and processing of being convenient for can the volume production and realize cost reduction's target.
Drawings
FIG. 1 is a cross-sectional view of the structure of the present invention;
FIG. 2 is a sequence view of the assembly of the sensor hub assembly of the present invention;
FIG. 3 is a sequence diagram illustrating the assembly of the sensor of the present invention;
fig. 4 is a cross-sectional view of the present invention mounted on a meter.
Detailed Description
The utility model provides an integral type is piezoelectricity acceleration sensor for instrument, as shown in figure 1, figure 2, figure 3, including sensor housing 17, sensor housing 17 bottom surface is equipped with fillet square flange 1701 and is convenient for this acceleration sensor's equipment, set up lock nut 19 on sensor housing 17 and be used for sensor housing 17 to fix on the instrument, be provided with sensor centrum 1 and signal conditioning board 9 in the sensor housing 17, sensor centrum 1 upper end stretches out from sensor housing 17 upper end mouth and is used for contacting with the measured object, sensor centrum 1 lower extreme side cover has an inertia mass ring 4, be provided with annular piezoceramics 5 between inertia mass ring 4 and the sensor centrum 1 lower extreme lateral wall, when sensor centrum 1 upper end touches the measured object, sensor centrum 1 can play, produce the electric charge signal of different polarity in sensor centrum 1 inboard and outside and annular piezoceramics 5 inboard under the effect of inertia shearing force in inertia mass ring 4 and the sensor The sensor central body 1 is led out and connected to a signal conditioning board 9, a signal processed by the signal conditioning board 9 is led out from a lower port of a sensor shell 17 through a signal 9 wire, a raised flange 18 is outwards arranged at the middle section of the sensor central body in the axial direction, a compression sleeve 8 is inwards inserted into the lower port of the sensor shell 17, a compression plug 10 is arranged behind the compression sleeve 8, the compression plug 10 is in threaded connection with the lower port of the sensor shell 17, the compression plug 10 is rotated to push the compression sleeve 8 to upwards prop against the flange 18 of the sensor central body shaft to position and fix the sensor central body, and elastic O-shaped rubber rings 2 and 3 are respectively arranged between the flange 18 of the sensor central body and the upper port of the sensor shell 17 and between the flange 18 of the sensor central body and the upper end face of the compression sleeve 8. The upper end of the sensor central body 1 is provided with a vibration pickup probe rod 16, the head of the vibration pickup probe rod 16 is in a circular arc spherical shape, and the vibration pickup probe rod 16 is fixedly connected with the upper end of the sensor central body 1 through threads. The signal conditioning plate 9 is fixed between the pressing plug 10 and the pressing sleeve 8 through the pressing plug 10. The sensor central body 1 and the annular piezoelectric ceramic sensor 5 and the inertial mass ring 4 are respectively bonded and fixed by conductive silver adhesive. The outer side surface of the bottom surface of the sensor pressing plug is provided with a blind hole 24, and the blind holes 24 are positioned at the left side and the right side of the central through hole 11 and used for inserting tools to adjust the tightness of the pressing elastic O-shaped rubber ring of the pressing sleeve 8.
The upper end face of the axial middle section of the sensor central body, which protrudes outwards, is an annular conical surface which protrudes inwards from outside, and the lower end face protruding outwards is a right-angle plane. The structure causes the difference of the up-and-down movement of the sensor central body 1, and the sensing signal is more stable and sensitive.
Wherein: the annular conical surface is an annular conical surface with an upward horizontal included angle of 25-45 degrees, and the annular conical surface with an angle of 30 degrees is selected in the embodiment.
The assembly sequence of the piezoelectric acceleration sensor and the installation applied to the instrument are as follows:
as shown in fig. 2 and 3, direction a in fig. 2; the direction B in the figure 3 is the direction of the assembly sequence, the joint 20 of the middle part of the sensor central body 1 and the annular piezoelectric ceramic 5 is coated with conductive silver adhesive, the annular piezoelectric ceramic 5 is sleeved on the sensor central body 1, the joint 21 of the annular piezoelectric ceramic 5 and the inertial mass ring 4 is coated with conductive silver adhesive, the inertial mass ring 4 is sleeved on the outer side of the annular piezoelectric ceramic 5, and then drying is carried out.
As shown in fig. 1, a signal lead pad 22 is added to the rear of the sensor hub 1 and screwed with a screw 23, and the signal lead pad 22 is welded with the internal connection signal wire 7, and the inertial mass ring 4 is welded with the internal connection signal wire 6. The other ends of the internal connecting signal wires 6 and 7 are welded on a signal conditioning plate 9. The signal processing circuit on the signal conditioning board 9 adopts an LF441 low-power consumption operational amplifier to amplify and output the acquired signal.
The elastic O-ring disposed above the flange 18, which is provided with a protrusion outward in the axial middle section of the sensor hub, is referred to as a first elastic O-ring 2, and the elastic O-ring disposed below the flange 18 is referred to as a second elastic O-ring 3.
As shown in fig. 1 and 3, the first elastic "O" ring 2 is pushed into the sensor housing 17, and the vibration-sensing probe 16 is screwed into the threaded hole at the top of the sensor hub 1 and fastened. Then the sensor central body assembly is pushed into a sensor shell 17, then a second elastic O-shaped ring 3 is sleeved into the sensor central body 1, then a pressing sleeve 8 is sleeved on the sensor central body 1, the pressing sleeve 8 presses the second elastic O-shaped ring 3 on the lower end face of a flange 18 of the sensor central body, then a signal conditioning plate 9 is placed, one side of the signal conditioning plate 9, which faces to a pressing plug 10, is welded with four external signal connecting wires 12, 13, 14 and 15, the pressing plug 10 is arranged behind the signal conditioning board 9, external signal connecting wires 12, 13, 14 and 15 welded on the signal conditioning board 9 penetrate through a central through hole 11 of the pressing plug 10, a professional tool is inserted into a blind hole 24 arranged on the bottom surface of the pressing plug 10 to screw the pressing plug 10, and the tightness of the elastic O-shaped rubber ring pressed by the pressing sleeve 8 is adjusted so as to adjust the size of the inertial shearing force generated by the movement of the upper end of the sensor central body 1 contacting with the measured body. The central through hole 11 is filled with the elastic sealant 703, and the sensor is formed after the sealant is solidified after standing for 24 hours.
As shown in fig. 4, when the piezoelectric acceleration sensor is used, the sensor needs to be clamped on an instrument, and then a sensor mounting lock nut 19 is screwed on the external thread on the front part of the sensor shell 17. After the sensor mounting locking nut 19 is screwed down, the radial locking and the axial locking of the connecting part of the instrument shell and the sensor are completed, and then the external signal connecting wires 12, 13, 14 and 15 are connected with the instrument through the interface plug.
The embodiment has the advantages that: because be equipped with "O" type rubber ring elastic support, make the utility model discloses a sensitivity that sensor centrum body subassembly experienced high frequency impact type signal is higher than the sensor that inelastic supported, and the internal thread that compresses tightly plug and sensor housing afterbody closes soon, can adjust the moment that closes soon in the minizone for the frequency response performance of sensor is better with the matching performance of instrument, and the instrument debugging and the production and processing of being convenient for can the volume production and realize the target that the cost is reduced.
Claims (7)
1. A piezoelectric acceleration sensor for an integrated instrument comprises a sensor shell, wherein a locking nut is arranged on the sensor shell and used for fixing the sensor shell on the instrument, a sensor central body and a signal conditioning plate are arranged in the sensor shell, the upper end of the sensor central body extends out of an upper port of the sensor shell and is used for being in contact with a measured body, an inertial mass ring is sleeved on the lower end side of the sensor central body, annular piezoelectric ceramics are arranged between the inertial mass ring and the side wall of the lower end side of the sensor central body, charge signals with different polarities are generated on the inner side and the outer side of the annular piezoelectric ceramics under the action of inertial shearing force and are led out and connected to the signal conditioning plate through the inertial mass ring and the sensor central body, and signals processed by the signal conditioning plate are led out from the lower port of the sensor shell through a signal, a pressing sleeve is inwards inserted into the lower port of the sensor shell, a pressing plug is arranged behind the pressing sleeve, the pressing plug is in threaded connection with the lower port of the sensor shell, the pressing plug is rotated to push the pressing sleeve to upwards push against the flange of the sensor central body to position and fix the sensor central body, and elastic O-shaped rubber rings are respectively arranged between the flange of the sensor central body and the upper port of the sensor shell and between the flange of the sensor central body and the upper end face of the pressing sleeve.
2. The piezoelectric acceleration sensor for an integral instrument according to claim 1, wherein the upper end surface of the sensor central body that protrudes outward in the axial middle section is an annular conical surface that protrudes inward and upward, and the lower end surface that protrudes outward is a right-angled plane.
3. The piezoelectric acceleration sensor for an integral instrument of claim 2, wherein the annular tapered surface is an annular tapered surface with an upward horizontal included angle of 30 degrees.
4. The piezoelectric acceleration sensor for an integral instrument according to claim 1, wherein a vibration pickup probe is disposed at an upper end of the sensor central body, a head of the vibration pickup probe is in a shape of a circular arc sphere, and the vibration pickup probe is fixedly connected with an upper end of the sensor central body by a thread.
5. The piezoelectric acceleration sensor for an integrated instrument according to claim 1, wherein the signal conditioning board is fixed between the compression plug and the compression sleeve by the compression plug.
6. The piezoelectric acceleration sensor for an integrated instrument according to claim 1, wherein the sensor central body and the annular piezoelectric ceramic and the inertial mass ring are respectively fixed by bonding with conductive silver adhesive.
7. The piezoelectric acceleration sensor for the integrated instrument as recited in claim 1, wherein the outer side surface of the bottom surface of the sensor pressing plug is provided with blind holes, and the blind holes are located on the left and right sides of the central through hole and used for inserting tools to adjust the tightness of the pressing elastic "O" shaped rubber ring of the pressing sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021176068.2U CN212111478U (en) | 2020-06-23 | 2020-06-23 | Piezoelectric acceleration sensor for integrated instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021176068.2U CN212111478U (en) | 2020-06-23 | 2020-06-23 | Piezoelectric acceleration sensor for integrated instrument |
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| CN212111478U true CN212111478U (en) | 2020-12-08 |
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| CN202021176068.2U Active CN212111478U (en) | 2020-06-23 | 2020-06-23 | Piezoelectric acceleration sensor for integrated instrument |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111624362A (en) * | 2020-06-23 | 2020-09-04 | 北京航天拓扑高科技有限责任公司 | Piezoelectric acceleration sensor for integrated instrument |
| CN114858268A (en) * | 2022-04-14 | 2022-08-05 | 厦门乃尔电子有限公司 | Vibration sensor and preparation method thereof |
| CN111624362B (en) * | 2020-06-23 | 2024-07-05 | 北京航天拓扑高科技有限责任公司 | Piezoelectric acceleration sensor for integral instrument |
-
2020
- 2020-06-23 CN CN202021176068.2U patent/CN212111478U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111624362A (en) * | 2020-06-23 | 2020-09-04 | 北京航天拓扑高科技有限责任公司 | Piezoelectric acceleration sensor for integrated instrument |
| CN111624362B (en) * | 2020-06-23 | 2024-07-05 | 北京航天拓扑高科技有限责任公司 | Piezoelectric acceleration sensor for integral instrument |
| CN114858268A (en) * | 2022-04-14 | 2022-08-05 | 厦门乃尔电子有限公司 | Vibration sensor and preparation method thereof |
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