CN212779542U

CN212779542U - Capacitive ultrasonic sensor

Info

Publication number: CN212779542U
Application number: CN202022126198.1U
Authority: CN
Inventors: 冯沁刚
Original assignee: Wuxi Lianhui Ultrasonic Electronics Co ltd
Current assignee: Wuxi Lianhui Ultrasonic Electronics Co ltd
Priority date: 2020-09-24
Filing date: 2020-09-24
Publication date: 2021-03-23
Anticipated expiration: 2030-09-24

Abstract

The utility model relates to the technical field of ultrasonic sensors, and discloses a capacitive ultrasonic sensor, which comprises a base, an insulating plate, a substrate, an upper polar plate and a pressing plate, wherein a first containing cavity and a second containing cavity are sequentially arranged in the middle of the base from top to bottom, the width of the first containing cavity is larger than that of the second containing cavity, the bottom of the first containing cavity is provided with the insulating plate, the middle of the insulating plate is provided with a third containing cavity, the substrate is arranged in the third containing cavity, the top of the substrate is provided with a plurality of annular grooves, the circle centers of all the grooves are the same, the top of the insulating plate is provided with the upper polar plate, the side wall of the pressing plate is connected with the inner wall of the first containing cavity, the bottom of the pressing plate is provided with a fourth containing cavity, the insulating plate is fixed in the fourth containing cavity, the capacitive detection device is formed by the substrate, then use the clamp plate to fix can, the equipment is simple and convenient.

Description

Capacitive ultrasonic sensor

Technical Field

The utility model relates to an ultrasonic sensor technical field, concretely relates to capacitanc ultrasonic sensor.

Background

Ultrasonic sensors are often used in the fields of distance detection, diameter detection, sag detection, and liquid level detection, for their ability to transmit high frequency sound waves. In recent years, capacitive ultrasonic sensors have become one of the main research directions of ultrasonic transducers. Compared with a piezoelectric ultrasonic sensor, the capacitive ultrasonic sensor has the advantages of higher detection sensitivity, larger bandwidth and lower mechanical impedance.

At present, when a capacitive ultrasonic sensor is designed and produced, an upper electrode and a lower electrode are mostly fixed in a substrate, when the positions of the upper electrode and the lower electrode change due to vibration, the capacitance value of a capacitor formed by the upper electrode and the lower electrode changes, and ultrasonic detection can be realized by detecting the capacitance value of the capacitor. However, this structure requires alignment of the upper electrode and the lower electrode in the substrate during actual mounting, which makes mounting difficult.

SUMMERY OF THE UTILITY MODEL

In view of the not enough of background art, the utility model provides a capacitive ultrasonic sensor, the technical problem that solve is that current capacitive ultrasonic sensor is most at substrate internally mounted upper electrode and bottom electrode, and the installation degree of difficulty is big, and production efficiency is low.

For solving the technical problem, the utility model provides a following technical scheme: the utility model provides a capacitanc ultrasonic sensor, includes base, insulation board, base plate, upper polar plate and clamp plate, from last first appearance chamber and the second appearance chamber of down being equipped with in proper order in the middle of the base, the width that first appearance chamber is greater than the width that the second holds the chamber, first appearance chamber bottom installation the insulation board, be equipped with the third in the middle of the insulation board and hold the chamber, the base plate is installed at the third and is held the intracavity, the recess of a plurality of ring shapes is seted up at the base plate top, and the centre of a circle of all recesses is the same, the installation of insulation board top upper polar plate, the lateral wall of clamp plate with the interior wall connection in first appearance chamber, the clamp plate bottom is equipped with the fourth and holds the chamber.

Further, the outer wall of the pressing plate is in threaded connection with the inner wall of the first accommodating cavity.

Further, the width of the upper plate is the same as the width of the insulating plate.

Furthermore, the material of the upper electrode plate is gold-plated polyamide.

Furthermore, a through hole is formed in the bottom of the base, the inner wall of the through hole is in threaded connection with the insulating pad, an electrode tip is installed inside the insulating pad, and one end of the electrode tip is electrically connected with the bottom of the substrate.

Compared with the prior art, the utility model beneficial effect who has is: through set up the recess on the base plate, base plate and last polar plate constitute capacitanc detection device, only need put insulation board, base plate and last polar plate in proper order inside the base when the installation, then use the clamp plate to fix can, the equipment is simple and convenient.

Drawings

The utility model discloses there is following figure:

fig. 1 is a schematic structural diagram of a capacitive ultrasonic sensor according to the present invention;

FIG. 2 is a schematic structural view of the base of the present invention;

fig. 3 is a schematic structural view of the pressing plate of the present invention;

fig. 4 is a schematic structural diagram of the substrate of the present invention.

In the figure: 1. the base, 2, first appearance chamber, 3, second appearance chamber, 4, perforation, 5, insulation board, 6, base plate, 7, recess, 8, upper polar plate, 9, clamp plate, 10, fourth appearance chamber, 11, insulating pad, 12, electrode tip.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.

As shown in fig. 1 to 4, a capacitive ultrasonic sensor includes: base 1, insulation board 5, base plate 6, go up polar plate 8 and clamp plate 9, base 1 is middle from last to down being equipped with in proper order that first appearance chamber 2 and second hold chamber 3, the width that first appearance chamber 2 is greater than the width that the second holds chamber 3, first appearance chamber 2 bottom installation insulation board 5, be equipped with the third in the middle of the insulation board 5 and hold the chamber, base plate 6 installs and holds the intracavity at the third, a plurality of ring shape's recess 7 is seted up at base plate 6 top, the centre of a circle of all recess 7 is the same, 5 tops installation polar plate 8 of insulation board, the lateral wall and the first interior wall connection that holds chamber 2 of

clamp plate

9, 9 portions are equipped with fourth appearance chamber 10 at the bottom of the clamp plate, insulation board.

In particular, for ease of installation, the outer wall of the pressure plate 9 is screwed to the inner wall of the first receiving chamber 2. Thus, the worker only needs to screw the pressing plate 9 into the first accommodating cavity 2 during assembly.

Particularly, in order to facilitate the leading-out of the detection signal, the bottom of the base 1 is provided with a through hole 4, the inner wall of the through hole 4 is in threaded connection with an insulating pad 11, an electrode tip 12 is installed inside the insulating pad 11, and one end of the electrode tip 12 is electrically connected with the bottom of the substrate 6.

In order to facilitate the positioning of the installation position of the insulating plate 5, the bottom of the insulating plate 5 is provided with a second groove matched with the electrode head 12, so that the insulating plate 5 can be placed into the insulating head 12 firstly during assembly, and the installation position of the insulating plate 5 is prevented from changing during assembly.

In this embodiment, the width of the upper plate 8 is the same as the width of the insulating plate 5.

In this embodiment, the upper plate 8 is a gold-plated polyamide film. The gold-plated surface of the film is far away from the substrate 6 and is equivalent to the negative electrode of the capacitor, and the substrate 6 is equivalent to the positive electrode of the capacitor. The method comprises the steps of applying alternating-current pulse voltage to the positive electrode and the negative electrode, enabling the film to generate high-frequency vibration by static electricity, pushing air to emit ultrasonic waves, enabling the ultrasonic waves to be reflected back when encountering obstacles, enabling the reflected waves to strike the film, enabling the film to deform, enabling a gap between the film and a metal substrate to change, enabling capacitance to change accordingly, converting the change of the capacitance into the change of the voltage by adopting a detection circuit, obtaining echo signals, and calculating the distance of a measured object according to the flight time of the ultrasonic waves in the air.

To sum up, the utility model discloses a set up recess 7 on base plate 6, base plate 6 constitutes capacitanc detection device with last polar plate 8, only need put insulation board 5, base plate 6 and last polar plate 8 in proper order when the installation inside base 1, then use clamp plate 9 to fix can, the equipment is simple and convenient.

In light of the above, the present invention is not limited to the above embodiments, and various changes and modifications can be made by the worker without departing from the scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A capacitive ultrasonic sensor, characterized by: including base, insulation board, base plate, upper polar plate and clamp plate, from last first appearance chamber and the second appearance chamber of down being equipped with in proper order in the middle of the base, the width that first appearance chamber is greater than the width that the second holds the chamber, first appearance chamber bottom installation the insulation board, be equipped with the third in the middle of the insulation board and hold the chamber, the base plate is installed at the third and is held the intracavity, a plurality of ring shape's recess has been seted up at the base plate top, and the centre of a circle of all recesses is the same, the installation of insulation board top the upper polar plate, the lateral wall of clamp plate with the inner wall in first appearance chamber is connected, the clamp plate bottom is equipped with the fourth and holds the chamber, the.

2. A capacitive ultrasonic sensor according to claim 1, wherein: the outer wall of the pressing plate is in threaded connection with the inner wall of the first accommodating cavity.

3. A capacitive ultrasonic sensor according to claim 1, wherein: the width of the upper polar plate is the same as that of the insulating plate.

4. A capacitive ultrasonic sensor according to claim 1 or 3, wherein: the upper polar plate is made of gold-plated polyamide.

5. A capacitive ultrasonic sensor according to claim 1, wherein: the base bottom has seted up the perforation, the perforation inner wall and insulating pad spiro union, insulating pad internally mounted has the electrode tip, electrode tip one end is connected with the base plate bottom electricity.