Self-powered pressure sensor based on postbuckling

Patent metadata

Field	Value
Publication number	US-2023314251-A1
Application number	US-202318327910-A
Country	US
Kind code	A1
Filing date	Jun 2, 2023
Priority date	Dec 4, 2020
Publication date	Oct 5, 2023
Grant date	—

Abstract

The present invention belongs to the field of pressure sensors, and particular relates to a self-powered pressure sensor based on the phenomenon of post-buckling. The self-powered pressure sensor comprises a carrier module, an electric every storage module, a sensing information control module and a pressure sensing module, wherein the pressure sensing module comprises a base, a cover plate and a flexible piezoelectric patch; the cover plate is inserted into the base, a first elastic element is arranged between the cover plate and the base in a matching manner, and a mounting cavity is further defined between the cover plate and the base; and the flexible piezoelectric patch is arranged in the mounting cavity, the periphery of the flexible piezoelectric patch matches the mounting cavity in a limiting manner, and a second elastic element is arranged between the flexible piezoelectric patch and the cover plate in a matching manner.

First claim

What is claimed is:

1 . A self-powered pressure sensor based on postbuckling, comprising:
an electrical energy storage module ( 1 ) configured to store electrical energy, a carrier module ( 2 ), a sensing information control module ( 3 ) configured to analyze and process electrical signals, and a pressure sensing module ( 4 ) provided at the carrier module ( 2 ); wherein the pressure sensing module ( 4 ) comprises: a base, a cover plate ( 401 ) inserted in the base, and a flexible piezoelectric sheet ( 410 ); wherein a first elastic element ( 408 ) is provided between the cover plate ( 401 ) and the base, an installation cavity is defined between the cover plate ( 401 ) and the base, the flexible piezoelectric sheet ( 410 ) is provided in the installation cavity, and is fitted along its periphery with the installation cavity in a limiting manner, and a second elastic element ( 413 ) is provided between the flexible piezoelectric sheet ( 410 ) and the cover plate ( 401 ), wherein when the cover plate ( 401 ) is pressed downward, the flexible piezoelectric sheet ( 410 ) is pressed by the cover plate ( 401 ), deformed, and depressed downward under a postbuckling; when the flexible piezoelectric sheet ( 410 ) is in a normal state, a middle part of the flexible piezoelectric sheet ( 410 ) is raised upward; when the flexible piezoelectric sheet ( 410 ) is under the postbuckling, the middle part of the flexible piezoelectric sheet ( 410 ) is depressed downward; when the flexible piezoelectric sheet ( 410 ) is pressed, electrical energy is generated and transmitted to the electrical energy storage module ( 1 ) and the sensing information control module ( 3 ).

2 . The self-powered pressure sensor based on postbuckling according to claim 1 , wherein the base comprises a lower part base ( 404 ) and an upper part base ( 403 ) screwed and fixed with the lower part base ( 404 ); a peripheral edge of the flexible piezoelectric sheet ( 410 ) is clamped between the lower part base ( 404 ) and the upper part base ( 403 ).

3 . The self-powered pressure sensor based on postbuckling according to claim 2 , wherein a plurality of chutes ( 407 ) are circularly provided at an inner wall of one of the upper part base ( 403 ) and the cover plate ( 401 ), and a slider ( 406 ) matched with the chutes ( 407 ) in a slide way is circularly provided at an inner wall of the other one of the upper part base ( 403 ) and the cover plate ( 401 ).

4 . The self-powered pressure sensor based on postbuckling according to claim 2 , wherein the first elastic element ( 408 ) and the second elastic element ( 413 ) are both made of springs, the first elastic element ( 408 ) is connected between the slider ( 406 ) and the chutes ( 407 ), and the second elastic element ( 413 ) is connected between the middle part of the flexible piezoelectric sheet ( 410 ) and the cover plate ( 401 ).

5 . The self-powered pressure sensor based on postbuckling according to claim 2 , wherein a boss ( 412 ) is provided at the lower part base ( 404 ); when the flexible piezoelectric sheet ( 410 ) is depressed downward, the boss ( 412 ) is capable of constraining the depression extent of the piezoelectric flexible sheet ( 410 ).

6 . The self-powered pressure sensor based on postbuckling according to claim 1 , wherein both of the base and the cover plate ( 401 ) are connected to the electrical energy storage module ( 1 ) and the sensing information control module ( 3 ) through a wire.

7 . The self-powered pressure sensor based on postbuckling according to claim 1 , wherein the carrier module ( 2 ) is densely covered with pressure sensing modules ( 4 ).

8 . The self-powered pressure sensor based on postbuckling according to claim 1 , wherein a groove ( 5 ) for installing the pressure sensing module ( 4 ) is provided at the carrier module ( 2 ).

9 . The self-powered pressure sensor based on postbuckling according to claim 1 , wherein the electrical energy storage module ( 1 ) and the sensing information control module ( 3 ) are provided at two sides of the carrier module ( 2 ), respectively.

Assignees

• Univ Zhejiang

Inventors

• Jiao Pengcheng
• Ouyang Fan
• Yang Yang
• Li Wentao

Classifications

• G01L9/008 Primary

  using piezoelectric devices (piezoelectric resonators G01L9/0022; surface acoustic waves G01L9/0025) · CPC title

• G01L19/0061

  Electrical connection means · CPC title

• H02N2/18 Primary

  producing electrical output from mechanical input, e.g. generators (for measurement devices G01) · CPC title

• G01L5/00

  Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes · CPC title

• G01L1/16 Primary

  using properties of piezoelectric devices · CPC title