CN-224205000-U - Piezoelectric actuator

CN224205000UCN 224205000 UCN224205000 UCN 224205000UCN-224205000-U

Abstract

The application discloses a piezoelectric actuator which comprises an elastic tube, a first sealing piece, a second sealing piece, a stack piezoelectric ceramic, a conducting wire and an actuating end, wherein the two ends of the elastic tube are respectively provided with a first port and a second port, the first sealing piece is arranged at one end of the elastic tube and seals the first port, the second sealing piece is arranged at the other end of the elastic tube and seals the second port, the elastic tube, the first sealing piece and the second sealing piece are enclosed to form a sealing cavity, the stack piezoelectric ceramic is arranged in the sealing cavity, the two ends of the stack piezoelectric ceramic are respectively connected with the first sealing piece and the second sealing piece, the elastic tube is always in a stretching state, one of the first sealing piece and the second sealing piece is provided with a conducting wire which is used for electrically connecting the stack piezoelectric ceramic with an external power supply, and the other one of the first sealing piece and the second sealing piece is provided with an actuating end which is used for externally pressing. The application can utilize the characteristic that the elastic tube can deform in a telescopic way, and the stack piezoelectric ceramics can drive the elastic tube to deform in a following way when being deformed. Therefore, the conventional shaft hole matching structure can be canceled, and the negative influence of friction on the output linearity of the stack piezoelectric ceramic is avoided.

Inventors

YU JIANHONG
LIU SHUO
WEI MING
DING CHUAN
Zheng Feixia
ZHU QINGBO
WU YUNCHEN
CHEN XIULING

Assignees

余姚市永创电磁阀有限公司

Dates

Publication Date: 20260505
Application Date: 20250522

Claims (10)

1. A piezoelectric actuator, comprising: The elastic tube (1) is provided with a first port (10) and a second port (11) at two ends respectively; a first closure (2) provided at one end of the elastic tube (1) and closing the first port (10); a second sealing piece (3) arranged at the other end of the elastic tube (1) and sealing the second port (11), wherein the elastic tube (1), the first sealing piece (2) and the second sealing piece (3) are enclosed to form a sealing cavity, and The stack piezoelectric ceramics (4) are arranged in the closed cavity, two ends of the stack piezoelectric ceramics (4) are respectively connected with the first closed piece (2) and the second closed piece (3), and the elastic tube (1) is always in a stretching state so as to apply pretightening force to the stack piezoelectric ceramics (4) through the first closed piece (2) and the second closed piece (3); Wherein one of the first and second enclosures (2, 3) is provided with a wire electrically connecting the stacked piezoelectric ceramic (4) with an external power source, and the other is provided with an actuation end (310) for applying pressure to the outside.
2. The piezoelectric actuator according to claim 1, wherein one end of the stack piezoelectric ceramic (4) is fixedly connected to the first sealing member (2), the other end of the stack piezoelectric ceramic (4) is abutted to the second sealing member (3), the conducting wire is arranged on the first sealing member (2), and the actuating end (310) is located on the second sealing member (3).
3. Piezoelectric actuator according to claim 2, wherein the first closure (2) comprises a sealing cap (20) and a sealing filler, the sealing cap (20) being provided with a lead hole (2000) for the lead wire to pass through, the sealing filler being used for sealing the lead hole (2000).
4. A piezoelectric actuator according to claim 3, wherein the sealing cover (20) comprises a cover plate (200) and an annular connecting part (201) positioned on the cover plate (200), the sealing cover (20) is fixedly connected with the elastic tube (1) through the annular connecting part (201), the cover plate (200) is matched with the annular connecting part (201) to form a connecting groove (202), and one end of the stacked piezoelectric ceramic (4) is clamped and fixed in the connecting groove (202).
5. Piezoelectric actuator according to claim 4, wherein the annular connection (201) is welded or adhesively or screwed to the elastic tube (1).
6. Piezoelectric actuator according to claim 2, wherein the second closing member (3) comprises a connecting tube (30) and a sealing cap (31) screwed into the connecting tube (30), the connecting tube (30) being fixedly connected to the elastic tube (1), the sealing cap (31) being in abutment with the stacked piezoelectric ceramic (4) towards an end face of the stacked piezoelectric ceramic (4), the end face of the sealing cap (31) facing away from the stacked piezoelectric ceramic (4) being provided with the actuation end (310).
7. Piezoelectric actuator according to claim 6, wherein the end face of the stacked piezoelectric ceramic (4) facing the sealing cap (31) is planar, and the end face of the sealing cap (31) facing the stacked piezoelectric ceramic (4) is planar or spherical cap.
8. Piezoelectric actuator according to claim 6, wherein the connecting tube (30) is welded or adhesively or screwed to the elastic tube (1).
9. Piezoelectric actuator according to any of claims 1 to 8, wherein the stacked piezoelectric ceramic (4) is spaced from the inner wall surface of the elastic tube (1).
10. Piezoelectric actuator according to any of claims 1 to 8, wherein said elastic tube (1) is a bellows.

Description

Piezoelectric actuator Technical Field The application relates to the technical field of precision driving, in particular to a piezoelectric actuator. Background The piezoelectric actuator is used as a core component for realizing electric energy and mechanical energy conversion by utilizing the inverse piezoelectric effect of piezoelectric materials, and has wide application in the fields of precision instruments, aerospace, biomedical and the like. The existing piezoelectric actuator generally comprises a stack piezoelectric ceramic arranged in a packaging structure and an actuating shaft extending out of the packaging structure, wherein the part of the actuating shaft positioned in the packaging structure is fixedly connected or abutted to the stack piezoelectric ceramic, and after the stack piezoelectric ceramic is electrified and deformed, the actuating shaft can be pushed to move outwards, so that acting force can be applied to an external part, and the purpose of converting electric energy into mechanical energy is achieved. Because the existing piezoelectric actuator needs to be provided with a driving shaft which moves in a telescopic way relative to the outer packaging structure of the piezoelectric actuator, a connecting hole matched with the driving shaft needs to be arranged on the packaging structure, and even if a bearing and a sealing piece are arranged, the sliding fit structure of the driving shaft and the connecting hole can influence the sealing performance of the packaging structure, and meanwhile, the output linearity of the stacked piezoelectric ceramics can be negatively influenced. In addition, the friction between the driving shaft and the connecting hole is increased with the abrasion caused by long-term use, which causes the influence of the friction on the output linearity of the stacked piezoelectric ceramics to be changed, so that the negative influence of the friction on the output linearity of the stacked piezoelectric ceramics is difficult to be compensated for by an algorithm. Disclosure of utility model The present application aims to solve one of the technical problems in the related art to a certain extent. To this end, the application provides a piezoelectric actuator. In order to achieve the above object, the present application adopts the following technical scheme that a piezoelectric actuator includes: the two ends of the elastic tube are respectively provided with a first port and a second port; A first closure provided at one end of the elastic tube and closing the first port; a second sealing member arranged at the other end of the elastic tube and sealing the second port, wherein the elastic tube, the first sealing member and the second sealing member enclose a sealing cavity, and The stack piezoelectric ceramics are arranged in the closed cavity, two ends of each stack piezoelectric ceramic are respectively connected with the first closed piece and the second closed piece, and the elastic tube is always in a stretching state so as to apply pretightening force to the stack piezoelectric ceramics through the first closed piece and the second closed piece; Wherein one of the first and second enclosures is provided with a wire electrically connecting the stacked piezoelectric ceramics with an external power source, and the other is provided with an actuation end for applying pressure to the outside. The application has the advantages that the closed cavity is formed by the elastic tube, the first closed piece and the second closed piece, the stacked piezoelectric ceramics are arranged in the closed cavity, the elastic tube can be driven to follow deformation when the stacked piezoelectric ceramics deform by utilizing the characteristic that the elastic tube can deform in a telescopic way, and meanwhile, the actuating end is utilized to apply acting force to the outside. Through the structural design, the shaft hole matching structure in the prior art can be canceled, and negative influence of friction on output linearity of the stacked piezoelectric ceramics is avoided. Thus, not only good sealing performance can be realized for the stacked piezoelectric ceramics, but also the control precision of the piezoelectric actuator can be improved. Optionally, one end of the stack piezoceramics is fixedly connected to the first sealing member, the other end of the stack piezoceramics is abutted to the second sealing member, the conducting wire is arranged on the first sealing member, and the actuating end is positioned on the second sealing member. Optionally, the first closure comprises a sealing cap provided with a lead hole for the wire to pass through, and a sealing filler for sealing the lead hole. Optionally, the sealing cover includes the apron and is located the annular connecting portion of apron, sealed lid passes through annular connecting portion and elastic tube rigid coupling, the apron cooperatees with annular connecting portion and forms the spread groove,