CN217586033U - Piezoelectric film knocking vibration sensor - Google Patents

Abstract

The utility model discloses a piezoelectric film strikes vibration sensor, which comprises a housin, there is sealed lid at the top of casing through fixed screw fixed mounting, the bottom is equipped with buffer gear in the casing, the outside that is located buffer gear in the casing is equipped with strengthening mechanism, fixed mounting has the dehumidification subassembly in the middle of the bottom that is located buffer gear in the casing, fixed screw fixed mounting has circuit PCB board at buffer gear's top in the casing, the top right side of circuit PCB board is equipped with the piezoelectric film piece. The above structure is adopted in the utility model, through setting up the dehumidification subassembly for during the use, extend in the inside of casing through the dehumidification board, alright see through the empty groove and the inside moisture that gets into of otter board absorption casing this moment, and then reached better dehumidification function, when the dehumidification board needs drying or change, the sealed board of pulling moves the magnet board and removes and pull out the dehumidification board can.

Description

Piezoelectric film knocking vibration sensor

Technical Field

The utility model belongs to the vibration sensor field, in particular to piezoelectric film strikes vibration sensor.

Background

The traditional knocking vibration sensor has magnetic bead switch vibration and acceleration vibration, the first magnetic bead switch vibration is low in cost, but the misjudgment rate is high, and the force cannot be detected; the second type of acceleration vibration is high in price, complex in driving program, protected by the existing patent and limited in use, and meanwhile, the existing knocking vibration sensor is frequently used on a dish washing machine and a refrigerator, so that the interior of the existing knocking vibration sensor is easily affected with damp and damaged after being used for a long time, and meanwhile, during use, the existing knocking vibration sensor is likely to vibrate in the use process of the dish washing machine or the refrigerator and is further easily damaged, so that the existing knocking vibration sensor needs to be improved.

SUMMERY OF THE UTILITY MODEL

To the problem mentioned in the background art, the utility model aims at providing a piezoelectric film strikes vibration sensor to solve current strike vibration sensor because on its multi-purpose dish washer, refrigerator, its inside long-time back of using damps easily and damages, during the simultaneous use, because probably have the vibration in dish washer or the refrigerator use, and then the problem of easy damage.

The above technical purpose of the present invention can be achieved by the following technical solutions:

the utility model provides a piezoelectric film strikes vibration sensor, includes the casing, there is sealed lid at the top of casing through fixed screw fixed mounting, the bottom is equipped with buffer gear in the casing, the outside that is located buffer gear in the casing is equipped with strengthens the mechanism, fixed mounting has the dehumidification subassembly in the middle of the bottom that is located buffer gear in the casing, buffer gear's top has circuit PCB board through fixed screw fixed mounting in the casing, the top right side of circuit PCB board is equipped with the piezoelectric film piece.

Through adopting above-mentioned technical scheme, through setting up the dehumidification subassembly for during the use, extend in the inside of casing through the dehumidification board, alright see through dead slot and otter board this moment and absorb the inside moisture that gets into of casing, and then reached better dehumidification function, when the dehumidification board needs drying or change, the sealed board of pulling moves the magnet board and removes and pull out the dehumidification board can.

Further, as a preferable embodiment, the piezoelectric thin film sheet is composed of a PET substrate, upper and lower electrodes, a piezoelectric thin film layer, and an insulating protective layer.

Through adopting above-mentioned technical scheme, through setting up the piezoelectric film piece, can assist local vibration sensor to realize sensing function, simple structure simultaneously, the practicality is stronger.

Further, as preferred technical scheme, buffer gear includes miniature attenuator, equidistant fixed mounting in casing bottom both sides, the top fixed mounting of miniature attenuator has the base plate, the top of base plate and the bottom fixed connection of circuit PCB board, the both sides of base plate are connected with the inboard laminating in upper end of strengthening the mechanism.

By adopting the technical scheme, the micro damper and the substrate are matched with each other, so that a good buffering and damping function can be achieved, and the buffering capacity in the sensor is effectively improved.

Further, as a preferred technical scheme, an empty groove is formed in the middle of the substrate, and a screen plate is arranged on the inner side of the empty groove.

Through adopting above-mentioned technical scheme, set up dead slot and inside otter board, can assist the dehumidification subassembly to reach dehumidification effect.

Further, as preferred technical scheme, strengthen the mechanism and include the sleeve, sleeve fixed mounting both ends around the casing both sides, the inside fixed mounting of sleeve has expanding spring, expanding spring's top is equipped with the spacer pin, the upper end of spacer pin sets up to triangle-shaped, the inboard both sides laminating with the base plate of upper end of spacer pin is connected, the both sides tangent plane shape of circuit PCB board also sets up to triangle-shaped.

Through adopting above-mentioned technical scheme, through setting up the strengthening rib hook, the inclined plane of accessible spacer pin is laminated with the both sides inclined plane of base plate to when the base plate rocked, can touch the spacer pin and contradict expanding spring, and then reached the purpose of strengthening the buffering effect.

Further, as a preferred technical scheme, the dehumidification subassembly includes the card rail, the card rail sets up to two sets of, two sets of card rail fixed mounting is in the middle of the bottom in the casing, the inboard sliding connection of card rail has the dehumidification board, the front end of dehumidification board runs through shell fixed mounting and has the closing plate.

Through adopting above-mentioned technical scheme, through setting up the inboard gliding dehumidification board of card rail, can adsorb the inside moisture of casing, set up the closing plate simultaneously, can seal the front end of dehumidification board, be convenient for simultaneously dismantle the dehumidification board.

Further, as a preferred technical scheme, magnet plates are arranged on two sides of the sealing plate, and the shell is a metal shell.

Through adopting above-mentioned technical scheme, through setting up magnet board, can be so that the closing plate is supplementary to be adsorbed on metal casing, and then improve the stability of dehumidification board installation.

To sum up, the utility model discloses mainly have following beneficial effect:

firstly, by arranging the buffer mechanism and the reinforcing mechanism, when the shell is shaken, the miniature damper is stressed and pressed to stretch through the substrate, so that a better buffer effect is achieved, and meanwhile, during the movement of the substrate, the circuit PCB can be abutted against the limit pin, so that the limit pin is abutted against the telescopic spring to shake and contract on the inner side of the sleeve, so that a better buffer effect is achieved, and the buffer effect is further improved;

secondly, through the arrangement of the dehumidifying component, the dehumidifying plate extends into the shell during use, and moisture entering the shell can be absorbed through the empty groove and the screen plate, so that a better dehumidifying function is achieved;

and thirdly, the principle of the piezoelectric film knocking vibration sensor is that the acting force of knocking action is released on an induction surface, an electric signal is generated between the upper electrode surface and the lower electrode surface of the film, and the electric signal is converted by a circuit and then filtered by combining hardware and software, so that a useful knocking signal is detected. The effective data is output through the 1-wire analog serial port, and communication resources are saved. The sensor is internally compatible with a sensitivity adjusting function, and a user can adjust the sensitivity to adapt to different application occasions, so that the sensor is convenient for the user to use, has a simple structure and low use cost, and is worth popularizing and using.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a diagram of the structure of the PCB board of the present invention;

fig. 3 is a top view of the housing of the present invention.

Reference numerals: 1. the device comprises a shell, 2, a sealing cover, 3, a buffer mechanism, 31, a miniature damper, 32, a base plate, 33, a hollow groove, 34, a screen plate, 4, a reinforcing mechanism, 41, a sleeve, 42, a telescopic spring, 43, a limiting pin, 5, a dehumidifying component, 51, a clamping rail, 52, a dehumidifying plate, 53, a sealing plate, 54, a magnet plate, 6, a circuit PCB plate, 7 and a piezoelectric film sheet.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1

Referring to fig. 1-3, this embodiment a piezoelectric film strikes vibration sensor, including casing 1, there is sealed lid 2 at the top of casing 1 through fixed screw fixed mounting, the bottom is equipped with buffer gear 3 in casing 1, the outside that lies in buffer gear 3 in casing 1 is equipped with strengthening mechanism 4, fixed mounting has dehumidification subassembly 5 in the middle of the bottom that lies in buffer gear 3 in casing 1, there is circuit PCB board 6 at the top of buffer gear 3 in casing 1 through fixed screw fixed mounting, the top right side of circuit PCB board 6 is equipped with piezoelectric film 7.

Through setting up dehumidification subassembly 5 for during the use, extend in the inside of casing 1 through dehumidification board 52, alright see through dead slot 33 and otter board 34 this moment and absorb the inside moisture that gets into of casing 1, and then reached better dehumidification function, when dehumidification board 52 needs the drying or when changing, the pulling sealing plate 53 drives the removal of magnetite board 54 and pulls out dehumidification board 52 can.

Because the internal impedance of the piezoelectric sensor is very high and the output electric signal is very weak, the electric signal is generally amplified by a preamplifier with high input impedance and then transmitted, processed and measured. The preamplifier mainly functions to convert the high-impedance output of the piezoelectric sensor into low-impedance output and also plays a role in amplifying weak signals. The output signal of the piezoelectric sensor is subjected to impedance conversion and amplification by a preamplifier, the microprocessor detects the output signal, useful signals are analyzed and processed by a process sequence, then the useful signals are sent to data processing equipment in a mode of simulating a serial port or high and low levels, the principle of the piezoelectric film knocking vibration sensor is that the force of knocking action is released on an induction surface, electric signals are generated between the upper electrode surface and the lower electrode surface of a film, and the useful knocking signals are detected by combining hardware and software filtering after circuit conversion. The effective data is output through the 1-wire analog serial port, and communication resources are saved. The sensor is also internally compatible with a sensitivity adjusting function, and a user can adjust the sensitivity to adapt to different application occasions, so that the sensor is convenient for the user to use, has a simple structure and lower use cost, and is worthy of popularization and use.

Example 2

Referring to fig. 1-3, on the basis of embodiment 1, in order to achieve the purpose of improving the stability of the device in use, in this embodiment, the piezoelectric film sheet 7, the buffer mechanism 3 and the reinforcing mechanism 4 are innovatively designed, specifically, the piezoelectric film sheet 7 is composed of a PET substrate, upper and lower electrodes, a piezoelectric film layer and an insulating protective layer, the buffer mechanism 3 includes a micro damper 31, the micro damper 31 is fixedly installed on two sides of the bottom in the housing 1 at equal intervals, a base plate 32 is fixedly installed on the top of the micro damper 31, the top of the base plate 32 is fixedly connected with the bottom of the circuit PCB 6, two sides of the base plate 32 are attached to the inner side of the upper end of the reinforcing mechanism 4, a hollow slot 33 is arranged in the middle of the base plate 32, a mesh plate 34 is arranged on the inner side of the hollow slot 33, the reinforcing mechanism 4 includes a sleeve 41, the sleeve 41 is fixedly installed on the front and rear ends of two sides in the housing 1, an extension spring 42 is fixedly installed on the sleeve 41, a limit pin 43 is arranged on the top of the extension spring 42, the limit pin 43 is arranged on the top of the base plate, the upper end of the limit pin 43 is triangular, the limit pin 43 is attached to two sides of the base plate, and the two sides of the circuit PCB 6 are also arranged in a triangular cross-shaped cross-section; through setting up piezoelectric film piece 7, can assist local vibration sensor to realize sensing function, while simple structure, the practicality is stronger, mutually support through setting up miniature attenuator 31 and base plate 32, can reach better buffering shock-absorbing function, the inside buffer capacity of this sensor has been improved effectively, set up dead slot 33 and inside otter board 34, can assist dehumidification subassembly 5 to reach the dehumidification effect, through setting up the strengthening rib hook, the inclined plane of accessible spacer pin 43 and the laminating of the both sides inclined plane of base plate 32, thereby when base plate 32 rocked, can touch spacer pin 43 conflict expanding spring 42, and then reached the purpose of strengthening the buffering effect.

Example 3

Referring to fig. 1-3, on the basis of embodiment 2, in order to achieve the purpose of prolonging the service life of the vibration sensor, the present embodiment innovatively designs a dehumidifying component 5, specifically, the dehumidifying component 5 includes two sets of clamping rails 51, the clamping rails 51 are arranged in two sets, the two sets of clamping rails 51 are fixedly mounted in the middle of the bottom inside the housing 1, a dehumidifying plate 52 is slidably connected to the inner side of the clamping rails 51, a sealing plate 53 is fixedly mounted at the front end of the dehumidifying plate 52 penetrating through the housing, magnetic plates 54 are arranged on two sides of the sealing plate 53, and the housing 1 is arranged as a metal housing 1; through setting up the inboard gliding dehumidification board 52 of card rail 51, can adsorb the inside moisture of casing 1, set up closing plate 53 simultaneously, can seal the front end of dehumidification board 52, be convenient for dismantle simultaneously and remove wet board 52, through setting up magnet board 54, can make closing plate 53 supplementary absorption on metal casing 1, and then improve the stability of dehumidification board 52 installation.

The use principle and the advantages are as follows: receive when rocking when casing 1 during the use, it is flexible to oppress miniature damper 31 through base plate 32 atress, and then played better cushioning effect, simultaneously during base plate 32 removes, accessible circuit PCB board 6 conflicts spacer pin 43, make spacer pin 43 conflict expanding spring 42 rock the shrink in sleeve 41 inboard, and then reached better buffering effect, extend in the inside of casing 1 through dehumidification board 52 simultaneously, alright see through dead slot 33 and otter board 34 and absorb the inside moisture that gets into of casing 1 this moment, and then reached better dehumidification function, when dehumidification board 52 needs the drying or change, pulling closing plate 53 drive magnetite board 54 remove pull out dehumidification board 52 can.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. A piezoelectric film knocking vibration sensor is characterized in that: the shell comprises a housin, there is sealed lid at the top of casing through fixed screw fixed mounting, the bottom is equipped with buffer gear in the casing, the outside that lies in buffer gear in the casing is equipped with strengthens the mechanism, fixed mounting has the dehumidification subassembly in the middle of the bottom that lies in buffer gear in the casing, buffer gear's top has circuit PCB board through fixed screw fixed mounting in the casing, the top right side of circuit PCB board is equipped with the piezoelectric film piece.

2. A piezoelectric thin film slap vibration transducer as claimed in claim 1, wherein: the piezoelectric film piece is composed of a PET substrate, an upper electrode, a lower electrode, a piezoelectric film layer and an insulating protection layer.

3. A piezoelectric thin film tapping vibration transducer as claimed in claim 1, wherein: buffer gear includes miniature attenuator, equidistant fixed mounting in casing bottom both sides, miniature attenuator's top fixed mounting has the base plate, the top of base plate and the bottom fixed connection of circuit PCB board, the both sides of base plate are connected with the inboard laminating in upper end of strengthening the mechanism.

4. A piezoelectric thin film slap vibration transducer as claimed in claim 3, wherein: the middle of the substrate is provided with an empty groove, and the inner side of the empty groove is provided with a screen plate.

5. A piezoelectric thin film tapping vibration transducer as claimed in claim 3, wherein: the reinforcing mechanism comprises a sleeve, the sleeve is fixedly installed at the front end and the rear end of the two sides in the shell, an expansion spring is fixedly installed inside the sleeve, a limiting pin is arranged at the top of the expansion spring, the upper end of the limiting pin is triangular, the inner side of the upper end of the limiting pin is connected with the two sides of the base plate in a laminating mode, and the two sides of the circuit PCB are also triangular in section.

6. A piezoelectric thin film slap vibration transducer as claimed in claim 1, wherein: the dehumidification subassembly includes the card rail, the card rail sets up to two sets of, and is two sets of card rail fixed mounting is in the middle of the bottom in the casing, the inboard sliding connection of card rail has the dehumidification board, the front end of dehumidification board runs through shell fixed mounting and has the closing plate.

7. A piezoelectric thin film slap vibration transducer as claimed in claim 6, wherein: magnet plates are arranged on two sides of the sealing plate, and the shell is a metal shell.

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