Ultrasonic sensing device and manufacturing method thereof
A sensing device, ultrasonic technology, applied in measuring devices, lubrication indicator devices, using sound waves/ultrasonic waves/infrasonic waves to analyze fluids, etc., can solve reliability problems, difficult quality control, heavy work and other problems, to avoid material waste , easy quality control, high reliability effect
Pending Publication Date: 2020-12-15
DONGGUAN ZHENGYANG ELECTRONICS MECHANICAL CO LTD
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Problems solved by technology
[0005] However, the bonding force of the encapsulant sometimes cannot make the piezoelectric sheet closely adhere to the sensing surface, so that there is a problem of reliability in the ultrasonic sensing device in the prior art
[0006] In addition, the process of pouring the encapsulation gel into the outer shell often cannot accurately control the amount of the gel material, resulting in waste of materials, and it is also difficult to perform quality control or rework on the piezoelectric film and the gel in the outer shell
Method used
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Embodiment Construction
[0042] Figure 1A It is an explosion schematic diagram of an ultrasonic sensing device according to an embodiment of the present invention, Figure 1B It is a schematic cross-sectional view of an ultrasonic sensor device according to an embodiment of the present invention. Please refer to Figure 1A and Figure 1B , the ultrasonic sensor device 100 of this embodiment includes an outer shell 110 , a piezoelectric component 120 , a plate body 130 and a plurality of fixing pieces 140 . The outer casing 110 includes a top wall 111 , a bottom wall 112 and a surrounding side wall 113 connected between the bottom wall 112 and the top wall 111 . The top wall 111 has an opening 1110 opposite to the bottom wall 112 at the connecting side wall 113 . The piezoelectric component 120 includes a package body 121 and a piezoelectric film 122 at least partially covered by the package body 121 . The package body 121 is disposed on the bottom wall 112 and surrounded by the surrounding side wal...
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An ultrasonic sensing device comprises a shell cover, a piezoelectric assembly, a plate body and a plurality of fixing pieces. The shell cover comprises a top wall, a bottom wall and a surrounding side wall connected between the bottom wall and the top wall, and the top wall is provided with an opening opposite to the bottom wall at the position connected with the surrounding side wall. The piezoelectric assembly comprises a packaging body and a piezoelectric patch, at least one part of the piezoelectric patch is wrapped by the packaging body, the packaging body is arranged on the bottom walland surrounded by the surrounding side wall, and the piezoelectric patch is provided with a sensing surface which is exposed out of the packaging body and faces the bottom wall. The plate body is arranged on the top wall of the shell cover and is provided with a pressing surface which faces the packaging body and the top wall. And the plurality of fixing pieces are used for fixing the plate body on the top wall of the shell cover, so that the plate body applies pressure to the packaging body of the piezoelectric assembly, and the induction surface of the piezoelectric patch is pressed down onthe bottom wall. The invention also discloses a manufacturing method of the ultrasonic sensing device.
Description
technical field [0001] The invention relates to a sensing device, in particular to an ultrasonic sensing device with a piezoelectric component and a manufacturing method thereof. Background technique [0002] Diesel engines need to be equipped with a selective catalytic reduction (SCR) system to reduce the emission of toxic nitrogen and hydrogen compounds (NOx). The reduction catalyst system is to add urea to diesel to neutralize the toxic nitrogen and hydrogen compounds, so that the toxic nitrogen and hydrogen compounds are converted into water and nitrogen. When the concentration of urea in diesel is not enough, the diesel engine may emit too much nitrogen and hydrogen compounds. [0003] Urea used in diesel engines will be mixed with water and stored in a storage tank adjacent to the diesel engine. Usually, multiple ultrasonic sensing devices will be installed next to the storage tank to sense the urea concentration or liquid level of the fluid in the storage tank . ...
Claims
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IPC IPC(8): G01N29/02G01N29/24G01N29/22G01F23/296
CPCG01F23/296G01N29/02G01N29/222G01N29/2437G01N2291/0228
Inventor 李启圣傅玉燕叶柏村陈东孚郑智文黄棋麟严育屏
Owner DONGGUAN ZHENGYANG ELECTRONICS MECHANICAL CO LTD