CN217930535U - High-sensitivity piezoelectric ceramic vibration sensing device - Google Patents
High-sensitivity piezoelectric ceramic vibration sensing device Download PDFInfo
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- CN217930535U CN217930535U CN202220712723.4U CN202220712723U CN217930535U CN 217930535 U CN217930535 U CN 217930535U CN 202220712723 U CN202220712723 U CN 202220712723U CN 217930535 U CN217930535 U CN 217930535U
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Abstract
The application discloses a high-sensitivity piezoelectric ceramic vibration sensing device which comprises a shell, wherein a piezoelectric ceramic piece is arranged in the shell, the piezoelectric ceramic piece is horizontally arranged in the shell, the edge of the piezoelectric ceramic piece is fixed with the inner wall of the shell, and a sensing area of the piezoelectric ceramic piece is empty from top to bottom; the vibration sensing device also comprises a heavy hammer, and the heavy hammer is placed above the center of the piezoelectric ceramic piece. Has the following advantages: through the technical scheme of the heavy hammer, the sensitivity of the piezoelectric ceramic piece to sound sensing is greatly improved, so that the remote accurate measurement of the sound with long distance and small energy is achieved, and the precision of remote sound detection such as pipe network water leakage, power grid electric leakage and noise pollution is realized.
Description
Technical Field
The utility model relates to a high sensitivity piezoceramics vibration sensing device belongs to electronic sensor technical field.
Background
In the field of sound measurement and control, the piezoelectric ceramic piece is widely applied, and in the conventional design, external sound is mostly transmitted to the piezoelectric ceramic piece through the shell and air, so that the piezoelectric ceramic piece is subjected to vibration impact of sound waves to excite a sensing current signal. The design has low sensitivity, short sensing distance and poor accuracy, so that the application of the piezoelectric ceramic plate in the aspect of sound sensing is greatly limited. For example, the patent of "piezoelectric acoustic sensor" in patent No. 200510089078.6 is only capable of detecting noise signals of the operation conditions of a device which is close to the device and has loud sound due to low sensing sensitivity and poor accuracy. The sound sensor applied to water supply pipe network leakage detection at present also adopts the piezoceramics piece mode more, because the limitation that its sensitivity is low, can only detect the leak source that the distance is nearer, sound is great, this makes the technique that the pipe network leaks detection can't obtain general application, has become insurmountable difficult point in modern technology applications such as thing networking, big data.
Disclosure of Invention
The to-be-solved technical problem of the utility model is not enough to the above, provide a high sensitivity piezoceramics vibration sensing device, through weight technical scheme, improve piezoceramics piece to the sensitivity of sound sensing by a wide margin to reach the remote accurate measurement to the sound far away, that the energy is little, realize that the pipe network leaks, the electric wire netting leaks the precision that remote sound detected such as electric leakage, noise pollution.
For solving the technical problem, the utility model adopts the following technical scheme:
a high-sensitivity piezoelectric ceramic vibration sensing device comprises a shell, wherein a piezoelectric ceramic piece is arranged in the shell, the piezoelectric ceramic piece is horizontally arranged in the shell, the edge of the piezoelectric ceramic piece is fixed with the inner wall of the shell, and a sensing area of the piezoelectric ceramic piece is empty from top to bottom;
the vibration sensing device further comprises a heavy hammer, and the heavy hammer is placed above the center of the piezoelectric ceramic piece.
Furthermore, the heavy hammer is not fixedly connected with the shell and the piezoelectric ceramic piece, and is placed on the piezoelectric ceramic piece through the self weight of the heavy hammer.
Furthermore, the periphery of the heavy hammer is provided with a guide mechanism, one end of the guide mechanism is fixed on the inner wall of the shell, the other end of the guide mechanism is smooth and is in contact with the heavy hammer, the guide mechanism is used for supporting the heavy hammer to enable the heavy hammer to stand vertically, meanwhile, the heavy hammer and the guide mechanism do not generate friction resistance, the heavy hammer can move up and down fully when being subjected to sound vibration, and all weight and vibration energy are transferred to the piezoelectric ceramic plate.
Furthermore, guiding mechanism includes the leading truck, and the one end of leading truck is fixed on the inner wall of casing, and the other end of leading truck is the free end, and the pulley is installed to the free end of leading truck.
Furthermore, the free end of the guide frame adopts a smooth end head.
Furthermore, the guide mechanism adopts a traction cable mode.
Furthermore, magnetic steel is arranged below the piezoelectric ceramic piece and used for being placed on the metal water supply pipeline in an attracting mode.
Furthermore, the shape of the heavy hammer is a cylinder or a square column, and the lower end of the heavy hammer can be a pen shape, a sphere shape or a cone shape.
Furthermore, a hanging table is arranged at the upper end of the shell, a concave groove and a long hole are formed in the hanging table, a stop pin is arranged at the upper section of the heavy hammer, the stop pin is lifted up and placed on the concave groove, and the lower end of the heavy hammer is not contacted with the piezoelectric ceramic plate; when the stop pin horizontally rotates 90 degrees, the stop pin falls down from the long hole, and the heavy hammer falls on the piezoelectric ceramic sheet.
Furthermore, a sealing gland is arranged on the upper end shell of the heavy hammer and used for sealing the heavy hammer and the shell.
The application of a high-sensitivity piezoelectric ceramic vibration sensing device is characterized in that the sensing device is arranged on a water supply pipeline, when an external vibration sound source on the water supply pipeline is transmitted to the sensing device, a piezoelectric ceramic piece can synchronously fluctuate along with a shell, the traditional heavy hammer is relatively static, when the piezoelectric ceramic piece fluctuates downwards, the heavy hammer can downwards follow the gravity of the heavy hammer, and when the vibration amplitude of the piezoelectric ceramic piece rebounds from the bottom, the piezoelectric ceramic piece and the heavy hammer collide strongly to generate a large sensing current signal when encountering the descending heavy hammer;
then the piezoelectric ceramic piece is fluctuated and ascended, the heavy hammer is also ascended along with the fluctuation of the piezoelectric ceramic piece, the piezoelectric ceramic piece bears a relatively large pressure due to the gravity influence of the heavy hammer, when the upward amplitude of the piezoelectric ceramic piece reaches the top, the heavy hammer continues to move upwards or keeps the piezoelectric ceramic piece in place for a certain time due to inertia, and the piezoelectric ceramic piece releases the loaded pressure to generate a sensing current, so that the sensing device can continuously output a strong signal due to the action of the heavy hammer
The utility model adopts the above technical scheme, compare with prior art, have following technological effect:
through the technical scheme of designing the heavy hammer, the sensitivity of the piezoelectric ceramic piece to sound sensing is greatly improved, so that the remote accurate measurement of the sound with long distance and small energy is achieved, and the precision of remote sound detection such as pipe network water leakage, power grid electric leakage and noise pollution is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is a schematic structural diagram of a medium-high sensitivity piezoelectric ceramic vibration sensing device of the present invention;
FIG. 2 is a top view of FIG. 1;
fig. 3 is a schematic view of an application of the sensing device of the present invention;
fig. 4 is a schematic structural view of the sensing device without the pulley guide frame of the present invention;
fig. 5 is a schematic structural view of a sensing device of the middle traction cable guide frame according to the present invention;
fig. 6 to 8 are schematic diagrams showing the results of the suspension table and the gland in the present invention;
in the attached drawing, 1, a piezoelectric ceramic piece; 2. a weight; 3. a pulley; 4. a guide frame; 5. a housing; 6. magnetic steel; 7. a traction rope; 8, hanging a platform; 9, a stop pin; 10. a sealing gland; 11. a concave groove; 12. a long hole.
Detailed Description
The vibration sensing device also comprises a heavy hammer 2, wherein the heavy hammer 2 is arranged above the center of the piezoelectric ceramic piece 1, the heavy hammer 2 is not fixedly connected with the shell 5 and the piezoelectric ceramic piece 1, and the heavy hammer 2 is arranged on the piezoelectric ceramic piece 1 only through the self weight of the heavy hammer 2.
The shape of the weight 2 is cylindrical or square column, the lower end of the weight can be pen-shaped, spherical or conical, the weight 2 can be made of metal or nonmetal material with high specific gravity, and the weight can be adjusted according to the design requirement.
The periphery of the heavy hammer 2 is provided with a guide mechanism, the guide mechanism is used for supporting the heavy hammer 2 to enable the heavy hammer to stand vertically, and meanwhile, no frictional resistance is generated between the guide mechanism and the heavy hammer so that the heavy hammer 2 can move up and down fully when being subjected to sound vibration, and all weight and vibration energy are transmitted to the piezoelectric ceramic plate 1.
The guiding mechanism comprises a guiding frame 4, one end of the guiding frame 4 is fixed on the inner wall of the shell 5, the other end of the guiding frame 4 is a free end, a pulley 3 is installed at the free end of the guiding frame 4, the guiding frame 4 and the pulley 3 are used for supporting the weight 2 to enable the weight to stand vertically, the pulley 3 enables the free ends of the weight 2 and the guiding frame 4 not to generate friction resistance, so that the weight 2 can move up and down sufficiently when being subjected to sound vibration, and all weight and vibration energy are transmitted on the piezoelectric ceramic plate 1.
As shown in fig. 4, the free end of the guide frame 4 can also be a smooth end, and the smooth end can also make the weight 2 and the free end of the guide frame 4 not generate friction resistance.
As shown in fig. 5, the guide mechanism is in the form of a traction cable.
And magnetic steel 6 is arranged below the piezoelectric ceramic piece 1 and used for being placed on a metal water supply pipeline in an attracting mode.
As shown in fig. 6 to 8, a hanging platform 8 is provided on the upper end of the housing 5, a concave groove 11 and a long hole 12 are provided on the hanging platform 8, a stop pin 9 is provided on the upper section of the weight 2, the stop pin 9 is lifted up and placed on the concave groove 11, and the lower end of the weight 2 is not in contact with the piezoelectric ceramic plate 1; the stop pin 9 horizontally rotates by 90 degrees, the stop pin 9 falls from the strip hole 12, the heavy hammer 2 falls on the piezoelectric ceramic piece 1, and the hanging table 8 and the stop pin 9 have the functions of preventing the impact damage of the heavy hammer to the piezoelectric ceramic piece in the carrying and storing process of the sensor, and the heavy hammer falls on the piezoelectric ceramic piece only when the sensor enters an application site.
Further, on the housing 5 at the upper end of the weight 2, a sealing gland 10 is provided for sealing the weight 2 and the housing 5.
When an external sound source is transmitted to the device, the shell 5, the heavy hammer 2 and the piezoelectric ceramic piece 1 all generate vibration, but due to the suspension and the weight of the heavy hammer 2, the vibration energy of the heavy hammer 2 is directly transmitted to the piezoelectric ceramic piece 1, so that the surface of the piezoelectric ceramic piece 1 generates impact force which is much larger than the sound through the air, and further, the very small sound with a long distance can be sensed, and the sensing sensitivity of the piezoelectric ceramic piece 1 is greatly improved.
The utility model provides an application of high sensitive piezoceramics vibration sensing device, concrete analysis, when external vibration sound source transmitted this device, piezoceramics piece 1 can follow 5 synchronous fluctuations of casing, weight 2 was static relatively before, when piezoceramics piece 1 undulant downwards, weight 2 can follow downwards because of self gravity, and when piezoceramics piece 1 vibration range touched the end and rebounded, met the weight that is descending, piezoceramics piece 1 just can produce comparatively strong striking with weight 2 at this moment, produce a great sensing current signal. Then the piezoelectric ceramic piece 1 rises by wave, the heavy hammer 2 also rises along with the rise, due to the influence of gravity, the piezoelectric ceramic piece 1 bears a relatively large pressure, after the upward amplitude of the piezoelectric ceramic piece 1 reaches the top, the heavy hammer 2 keeps on going upward or in place for a certain time due to inertia, and the piezoelectric ceramic piece 1 releases the borne pressure to generate a sensing current. Thus, the sensing device can continuously output strong signals due to the action of the heavy hammer 2. After the signal is collected, amplified, processed and calibrated, the strength of the vibration sound source signal can be accurately judged, and therefore the size and the distance of the vibration sound source can be deduced.
Through under the same condition, the piezoceramics piece sound sensor of weight not with the piezoceramics piece vibration sensing device of weight tests, the test result as follows:
1. and (3) testing conditions: the sensing device is arranged on a tap water pipe at a distance of 10 meters from the tap, the size of the tap is adjusted to observe the effect, and the water outlet is a common four-way water nozzle (the tap is used for simulating a water leakage point).
1. When a tap is fully opened, the sensing device only outputs a voltage signal of plus or minus 10mV at a 200mV gear of an oscilloscope.
2. The sensing device after the weight dropper is added has a voltage signal output of plus or minus 300mV when the tap is opened to one third.
3. The sensing device after the heavy hammer is added outputs a voltage signal of plus and minus 800mV when the water tap is fully opened.
As can be seen by comparison, when the sensing device is not weighted, the sensing device only has 10mV signal output at 200mV gear of the oscilloscope no matter the water quantity is large or small; after the heavy hammer is added and released by the sensing device, a voltage signal of 300mV is output when the tap is opened to one third; sensing device adds puts the weight, has 800 mV's voltage signal output when tap is opened entirely, through above experiment, can see out sensing device compare with the sensing device that does not add the weight, sensing device sensitivity will be much higher.
2. And (3) testing conditions, namely, placing the sensing device on a place 100 meters away from the faucet on a tap water pipe, observing the effect when the faucet is fully opened, and using a common four-tap water outlet as a water outlet.
1. When the tap is fully opened, the sensing device without the heavy hammer has almost no voltage signal output at the 100mV gear of the oscilloscope.
2. When the tap is fully opened, the sensing device of the heavy hammer displays 200mV voltage signal output at 100mV gear of the oscilloscope.
Can find out through the contrast, under the condition that test distance 100 meters are far away, sensing device (prior art) of weight has not detected the leak source signal, and the sensing device who has added behind the weight has stronger sensing signal under same test distance, through above experiment, can see out sensing device compare with the sensing device who does not add the weight, sensing device can detect sound signal's distance effectively and want to be far away.
It is visible through the test, compare with the piezoceramics piece sound sensor that does not have the weight design in the past, sensing device's sensitivity will be high a lot, can detect effectively that the distance is far away, more small sound signal, but the detection etc. that are applied to pipe network detection, electric wire netting leakage strike sparks and detect and other sound or noise of leaking.
The description of the present invention has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (9)
1. The utility model provides a high sensitive piezoceramics vibration sensing device which characterized in that: the sensor comprises a shell (5), wherein a piezoelectric ceramic piece (1) is arranged in the shell (5), the piezoelectric ceramic piece (1) is horizontally arranged in the shell (5), the edge of the piezoelectric ceramic piece (1) is fixed with the inner wall of the shell (5), and a sensing area of the piezoelectric ceramic piece (1) is empty from top to bottom;
the vibration sensing device also comprises a heavy hammer (2), wherein the heavy hammer (2) is arranged above the center of the piezoelectric ceramic piece (1).
2. A high sensitivity piezoceramic vibration sensing device according to claim 1, wherein: the heavy hammer (2) is not fixedly connected with the shell (5) and the piezoelectric ceramic piece (1) and is placed on the piezoelectric ceramic piece (1) through the self weight of the heavy hammer (2).
3. A high sensitivity piezoceramic vibration sensing device according to claim 1, wherein: the periphery of weight (2) is equipped with guiding mechanism, and guiding mechanism's one end is fixed on the inner wall of casing (5), and guiding mechanism's the other end is smooth, with weight (2) contact, guiding mechanism is used for holding weight (2) and makes it stand vertically, weight (2) and guiding mechanism do not produce frictional resistance simultaneously, make weight (2) can the up-and-down full motion when receiving sound vibration, with whole weight and vibration energy transmission on piezoceramics piece (1).
4. A high sensitivity piezoceramic vibration sensing device according to claim 3, wherein: the guiding mechanism comprises a guiding frame (4), one end of the guiding frame (4) is fixed on the inner wall of the shell (5), the other end of the guiding frame (4) is a free end, and the pulley (3) is installed at the free end of the guiding frame (4).
5. A high sensitivity piezoceramic vibration sensing device according to claim 4, wherein: the free end of the guide frame (4) adopts a smooth end head.
6. A high sensitivity piezoceramic vibration sensing device according to claim 3, wherein: the guide mechanism adopts a traction cable mode.
7. A high sensitivity piezoceramic vibration sensing device according to claim 1, wherein: and magnetic steel (6) is arranged below the piezoelectric ceramic piece (1) and is used for attracting and placing the piezoelectric ceramic piece on a metal water supply pipeline.
8. A high sensitivity piezoceramic vibration sensing device according to claim 1, wherein: a hanging table (8) is arranged at the upper end of the shell (5), a concave groove (11) and a long hole (12) are formed in the hanging table (8), a stop pin (9) is arranged at the upper section of the heavy hammer (2), the stop pin (9) is lifted up and placed on the concave groove (11), and the lower end of the heavy hammer (2) is not in contact with the piezoelectric ceramic piece (1); the stop pin (9) horizontally rotates by 90 degrees, the stop pin (9) falls from the long hole (12), and the heavy hammer (2) falls on the piezoelectric ceramic piece (1).
9. A high sensitivity piezoceramic vibration sensing device according to claim 8, wherein: and a sealing gland (10) is arranged on the shell (5) at the upper end of the heavy hammer (2) and used for sealing the heavy hammer (2) and the shell (5).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114777906A (en) * | 2022-03-29 | 2022-07-22 | 山东潍微科技股份有限公司 | High-sensitivity piezoelectric ceramic vibration sensing device and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114777906A (en) * | 2022-03-29 | 2022-07-22 | 山东潍微科技股份有限公司 | High-sensitivity piezoelectric ceramic vibration sensing device and application thereof |
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