TWM590245U - Ultrasonic sensing device - Google Patents

Abstract

An ultrasonic sensing device includes a housing, a piezoelectric assembly, a board and a plurality of fixing members. The housing includes a bottom wall, a top wall and a surrounding side wall connecting between the top wall and the bottom wall. The top wall has an opening disposed on the portion connected to the surrounding side wall and opposite to the bottom wall. The piezoelectric assembly includes an encapsulating body and a piezoelectric sheet. The encapsulating body is disposed on the bottom wall and surrounded by the surrounding wall. The piezoelectric sheet includes at least a portion enclosed by the encapsulating body and has sensing surface exposed from the encapsulating body. The board has a pressing surface facing the top wall of the housing and the encapsulating body. The fixing members are configured to fix the board on the top wall of the housing.

Description

Ultrasonic detection device

This creation relates to a detection device, in particular to an ultrasonic detection device with a piezoelectric element.

A diesel engine requires a selective catalytic reduction (SCR) system to reduce the emission of toxic nitrogen oxides (NOx). The reduction catalyst system is to add urea to diesel oil 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 insufficient, the diesel engine may emit too much nitrogen and hydrogen compounds.

The urea used in diesel engines is mixed with water and stored in a storage tank adjacent to the diesel engine. Usually, multiple ultrasonic detection devices are provided beside the storage tank to detect the urea concentration or level of the fluid in the storage tank .

The ultrasonic detection device in the conventional technology mainly includes a housing cover and a piezoelectric sheet placed in the housing cover. In order for the piezoelectric sheet to be attached to the sensing surface in the housing cover, the piezoelectric sheet must be placed after the housing cover , Pour the encapsulating colloid into the shell.

However, the adhesive force of the encapsulating colloid sometimes fails to make the piezoelectric sheet closely adhere to the sensing surface, so that the ultrasonic detection device in the conventional technology has a reliability problem.

In addition, the process of pouring the encapsulating colloid into the housing cover often fails to accurately control the amount of colloidal material, resulting in waste of materials, and it is also difficult to perform quality control or heavy work on the piezoelectric sheets and colloids in the housing cover.

This creation provides an ultrasonic detection device with high reliability.

The ultrasonic detection device provided by this creation includes a housing cover, a piezoelectric component, a plate body and a plurality of fixing parts. The housing cover includes a top wall, a bottom wall, and a surrounding side wall connected between the bottom wall and the top wall. The top wall has an opening opposite to the bottom wall at the connecting side wall. The piezoelectric component includes a package body and at least a portion of a piezoelectric sheet covered by the package body. The package body is disposed on the bottom wall and surrounded by the surrounding side wall. The piezoelectric sheet has a sensing surface exposed to the package body and facing the bottom wall. The plate body is arranged on the top wall of the housing cover and has a pressing surface which faces the package body and the top wall. A plurality of fixing members are used to fix the plate body to the top wall of the housing cover, so that the plate body is pressed against the package of the piezoelectric component, and then the sensing surface of the piezoelectric sheet is pressed down against the bottom wall.

In an embodiment of the present creation, the plate body is bent or flat.

In an embodiment of the present creation, the board body is a circuit board.

In an embodiment of the present creation, the plate body includes a plate body having a single material or a plate body having a composite material.

In an embodiment of the present creation, the piezoelectric component further includes a positive lead connected to the piezoelectric sheet at one end and a negative lead connected to the piezoelectric sheet at one end, the positive lead and the negative lead pass through the package, and The plate body has two openings for the positive electrode guide pin and the negative electrode guide pin to pass through.

In an embodiment of the present creation, the package is adhered to the surrounding side wall.

In an embodiment of the present creation, the package has a surrounding shape that is conformal to the surrounding side wall.

In an embodiment of the present invention, the piezoelectric component further includes a matching layer or a conductive layer disposed on the sensing surface of the piezoelectric sheet and corresponding to the vibration energy of the piezoelectric sheet.

In an embodiment of the present invention, each fixing member is a screw, the plate body has multiple perforations, and the top wall has multiple screw holes.

In an embodiment of the present invention, it further includes an outer frame and a cover body, the outer frame surrounds and connects the top wall and the surrounding side wall of the housing cover, and extends away from the bottom wall, and the end away from the bottom wall has an opening and a cover The body closes the opening.

In an embodiment of the present invention, it further includes a reflective plate and a plurality of connecting rods. The reflective plate is disposed opposite to the housing cover and the outer frame, and each connecting rod is connected between the reflective plate and the outer frame.

In an embodiment of the present invention, the package includes a matching layer and/or an absorption layer corresponding to the vibration energy of the piezoelectric sheet.

The ultrasonic detection device of the embodiment of the present invention presses the plate body to the package body, so that the piezoelectric sheet can be pressed against the bottom wall of the housing cover. Compared with the conventional technology, the piezoelectric sheet is only connected to the gel The housing cover, in the embodiment of the present invention, the piezoelectric sheet can be more tightly arranged on the bottom wall of the housing cover, thereby having higher reliability.

In order to make the above-mentioned and other purposes, features and advantages of this creation more obvious and understandable, the following examples are given in detail, and in conjunction with the attached drawings, detailed descriptions are as follows.

100, 100a, 100b, 100c ‧‧‧ ultrasonic detection device

110‧‧‧Housing cover

111‧‧‧Top wall

1110‧‧‧ opening

1111‧‧‧Screw hole

112‧‧‧Bottom wall

113‧‧‧ surround the side wall

120‧‧‧ Piezoelectric components

121‧‧‧Package

122‧‧‧ Piezoelectric

1221‧‧‧sensing surface

123‧‧‧Positive guide pin

124‧‧‧Negative guide pin

125‧‧‧adhesive layer

130、130a‧‧‧Board

131‧‧‧pressed noodles

132‧‧‧Setting surface

133‧‧‧Connector

134‧‧‧recess

135‧‧‧Convex

136‧‧‧Perforation

137、138‧‧‧Opening

140‧‧‧Fixed parts

150‧‧‧frame

160‧‧‧cover

170‧‧‧Reflective plate

180‧‧‧Connecting rod

FIG. 1A is an explosion schematic diagram of an ultrasonic detection device according to an embodiment.

FIG. 1B is a schematic cross-sectional view of an ultrasonic detection device according to an embodiment of the invention.

FIG. 1C is a schematic diagram of a board according to another embodiment of the invention.

2A to 2D are schematic diagrams of a method for manufacturing an ultrasonic detection device according to another embodiment.

FIG. 3 is a schematic cross-sectional view of an ultrasonic detection device according to another embodiment.

FIG. 4 is a schematic diagram of an ultrasonic detection device according to another embodiment.

FIG. 1A is an explosion schematic diagram of an ultrasonic detection device according to an embodiment, and FIG. 1B is a schematic cross-sectional diagram of an ultrasonic detection device according to an example. 1A and 1B, the ultrasonic detection device 100 of this embodiment includes a housing cover 110, a piezoelectric element 120, a plate 130, and a plurality of fixing members 140. The housing cover 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 the bottom wall 112 at the connecting surrounding side wall 113. The piezoelectric component 120 includes a package body 121 and at least a part of the piezoelectric sheet 122 covered by the package body 121. The package 121 is disposed on the bottom wall 112 and surrounded by the surrounding side wall 113. The piezoelectric sheet 122 has a sensing surface 1221 exposed to the package 121 and facing the bottom wall 112. The plate body 130 is disposed on the top wall 111 of the housing cover 110 and has a pressing surface 131 which faces the package body 121 and the top wall 111. A plurality of fixing members 140 is used to fix the plate 130 to the top wall 111 of the housing cover 110, and to press the plate 130 against the package 121 of the piezoelectric component 120, thereby pressing down the sensing surface 1221 of the piezoelectric sheet 122于底壁112.

In this embodiment, the plate body 130 may include a single material plate body or a composite material plate body. In this embodiment, the board body 130 may be a circuit board. For example, the board body 130 may further have a setting surface 132 opposite to the pressing surface 131. The board body 130 may be provided with a connector 133 on the setting surface 132 for electrical connection For external devices (not shown).

In this embodiment, the plate body 130 has a flat plate shape, but it is not limited to this. For example, FIG. 1C illustrates a bent plate 130a. The plate body 130a has a concave portion 134 on one side and a corresponding convex portion 135 on the other side. When the package body 121 protrudes from the opening 1110 of the top wall 111, it can abut against the concave However, if the package body 121 is recessed in the opening 1110 of the top wall 111, it can abut the convex portion 135.

In this embodiment, the package 121 and the piezoelectric sheet 122 of the piezoelectric component 120 may be combined in a mold in advance, so the manufacturing method of the ultrasonic detection device 100 of this embodiment may include the following steps: a. Provide a housing cover 110 . b. The piezoelectric component 120 is provided. c. Place the piezoelectric component 120 on the bottom wall 111 of the housing cover 110. d. Cover the plate body 130 on the top wall 111. e. Fix the plate 130 to the top wall 111 by the fixing member 140.

In the present embodiment, the package 121 of the piezoelectric component 120 has a surrounding shape conforming to the surrounding side wall 113, such as a circle shown in FIG. 1A, but it is not limited thereto. The package body 121 and the surrounding side wall 113 may also have other conformal shapes, such as polygonal shapes. The package body 121 may include a matching layer and/or an absorption layer corresponding to the vibration energy of the piezoelectric sheet, and the material may include epoxy, silicon oxide (SiOx), or other colloids.

In this embodiment, the piezoelectric component 120 further includes an adhesive layer 125 disposed on the sensing surface 1221 of the piezoelectric sheet 122 and corresponding to the piezoelectric sheet 122, which may be a matching layer or a conductive layer corresponding to the vibration energy of the piezoelectric sheet 122 .

In this embodiment, the piezoelectric component 120 further includes a positive lead 123 connected to the piezoelectric sheet 122 at one end and a negative lead 124 connected to the piezoelectric sheet 122 at one end. The positive lead 123 and the negative lead 124 pass through The package body 121 and the plate body 130 have openings 137 and openings 138 for the positive electrode guide pin 123 and the negative electrode guide pin 124 to pass through, respectively. The positive electrode guide pin 123 and the negative electrode guide pin 124 can be connected to an external power supply device (not shown).

In this embodiment, each fixing member 140 is a screw, and the plate body 130 has a plurality of through holes 136, and the top wall 111 of the housing cover 110 has a plurality of screw holes 1111, by locking the fixing members 140 to the screw holes 1111, to fix the plate body 130 to the top wall 111 and apply pressure to the package body 121. The number of the fixing member 140 is at least three, to balance the down force of the plate body 130.

In this embodiment, the material of the housing cover 110 may be metal such as stainless steel, aluminum alloy, or other alloys, but it is not limited thereto. The material of the housing cover 110 may also be an insulating material such as Polyamide (PA), Polyethylene (PE) or Polypropylene (PP).

The ultrasonic detection device 100 of this embodiment can be placed in a liquid, for example, it can be used with a waveguide (not shown) to detect the height of the liquid level, or it can be set opposite to a reflector to detect the concentration of the liquid .

In the ultrasonic detection device 100 of this embodiment, the plate body 130 is pressed against the package body 121, so that the piezoelectric sheet 122 can abut against the bottom wall 111 of the housing cover 110. Compared with the piezoelectric sheet in the prior art With the glue connected to the housing cover, the piezoelectric sheet 122 in the embodiment of the present invention can be more closely attached to the bottom wall 111 of the housing cover 110, thereby having better reliability.

The manufacturing method of the ultrasonic detection device 100 of this embodiment is to integrate the package body 121 and the piezoelectric sheet 122 into a module before being placed in the housing cover 110, and the raw material of the package body 121 can be poured into a dedicated mold to facilitate Quality control, heavy industry, and can accurately control the amount of material to be poured to avoid unnecessary material waste.

2A to 2D are schematic diagrams of a method for manufacturing an ultrasonic detection device according to another embodiment. The manufacturing method of the ultrasonic detection device 100a of this embodiment is as follows.

First, please refer to FIG. 2A, provide the housing cover 110 as shown in FIG. 1A, and cover the bottom wall 112 of the housing cover 110 with an adhesive layer 125, and then place the piezoelectric sheet 122 into the housing cover 110 through the opening 1110 of the top wall 111 Placed on the bottom wall 111. The glue layer 125 can provide a preliminary positioning of the piezoelectric sheet 122.

Next, referring to FIG. 2B, a liquid gel 121a is poured into the opening 1110 to cover the piezoelectric sheet 122. The gel 121a may be in a state before the package 121 of FIG. 1A is cured.

2C, a plate 130 as shown in FIG. 1A is provided, and the plate 130 is covered on the top wall 111 of the housing cover 110. The board body 130 may be installed before or after the gel 121a is cured according to requirements.

2D, the plate 130 is fixed to the top wall 111 by the fixing member 140, the plate 130 is pressed against the gel 121a, and the sensing surface 1221 of the piezoelectric plate 122 is pressed down against the bottom wall 112, when After the colloid 121a is cured into the package 121 as shown in FIG. 1A, the ultrasonic detection device 100a of this embodiment is completed.

The ultrasonic detection device 100a of this embodiment is substantially the same as the ultrasonic detection device 100 of FIG. 1A, except that the package 121 of this embodiment is cured in the housing cover 110, so the package 121 will adhere to the housing cover 110 The sidewall 113.

FIG. 3 is a schematic cross-sectional view of an ultrasonic detection device according to another embodiment. Please refer to FIG. 3. The ultrasonic detection device 100 b of this embodiment is substantially the same as the ultrasonic detection device 100 of FIG. 1A, except that the ultrasonic detection device 100 b of this embodiment further includes an outer frame 150 and a cover 160. The outer frame 150 surrounds and connects the top wall 111 and the surrounding side wall 113 of the housing cover 110, and extends away from the bottom wall 112, and has an opening 1500 at the end away from the bottom wall 112, and the cover 160 closes the opening 1500. The cover 160 and the outer frame 150 can be combined in different ways according to requirements, such as bonding, snapping or screwing.

FIG. 4 is an explosion schematic diagram of an ultrasonic detection device according to another embodiment. Referring to FIG. 4, the ultrasonic detection device 100 c of this embodiment is substantially the same as the ultrasonic detection device 100 b of FIG. 3, the difference is that the ultrasonic detection device 100 c of this embodiment further includes a reflective plate 170 and a plurality of connecting rods 180. The reflective plate 170 is opposite to the housing cover 110 and the outer frame 150, and the connecting rod 180 is connected between the reflective plate 170 and the outer frame 150. The reflection plate 170 can be used to reflect the vibration signal of the piezoelectric element 120 to detect the concentration of the liquid.

The ultrasonic detection device of the embodiment of the present invention presses the plate body to the package body, so that the piezoelectric sheet can be pressed against the bottom wall of the housing cover. Compared with the conventional technology, the piezoelectric sheet is only connected to the gel The housing cover, in the embodiment of the present invention, the piezoelectric sheet can be more tightly arranged on the bottom wall of the housing cover, thereby having higher reliability.

The manufacturing method of the ultrasonic detection device of the embodiment of the present invention is to integrate the package body and the piezoelectric sheet into a module before being placed in the housing cover. The raw materials of the package body can be poured in a special mold to facilitate quality control, Heavy industry, and can accurately control the amount of material to be poured to avoid unnecessary waste of materials.

Although this creation has been disclosed as above with examples, it is not intended to limit this creation. Those with ordinary knowledge in the technical field to which this creation belongs can make some changes and retouching without departing from the spirit and scope of this creation. Therefore, the scope of protection of this creation shall be deemed as defined by the scope of the attached patent application.

100‧‧‧Ultrasonic detection device

110‧‧‧Housing cover

111‧‧‧Top wall

1110‧‧‧ opening

1111‧‧‧Screw hole

112‧‧‧Bottom wall

113‧‧‧ surround the side wall

120‧‧‧ Piezoelectric components

121‧‧‧Package

123‧‧‧Positive guide pin

124‧‧‧Negative guide pin

130‧‧‧Board

131‧‧‧pressed noodles

132‧‧‧Setting surface

133‧‧‧Connector

136‧‧‧Perforation

140‧‧‧Fixed parts

Claims (12)

An ultrasonic detection device includes: a housing cover, including a top wall, a bottom wall and a surrounding side wall connected between the bottom wall and the top wall, the top wall has a bottom opposite to the bottom wall An opening in the wall; a piezoelectric component, including a package and at least a portion of a piezoelectric sheet covered by the package, the package is disposed on the bottom wall and surrounded by the surrounding side wall, the piezoelectric The sheet has a sensing surface exposed to the package body and facing the bottom wall; a plate body is disposed on the top wall of the housing cover and has a pressing surface facing the package body and the top wall; a plurality of fixing members For fixing the plate body to the top wall of the housing cover, pressing the plate body to the package body of the piezoelectric component, and then pressing the sensing surface of the piezoelectric sheet down to the bottom wall. The ultrasonic detection device according to claim 1, wherein the plate body is bent or flat. The ultrasonic detection device according to claim 1, wherein the board body is a circuit board. The ultrasonic detection device according to claim 1, wherein the plate body includes a plate body having a single material or a plate body having a composite material. The ultrasonic detection device according to claim 1, wherein the piezoelectric component further includes a positive guide pin connected to the piezoelectric sheet at one end and a negative guide pin connected to the piezoelectric sheet at one end. The negative electrode guide pin passes through the package body, and the plate body has two openings for the positive electrode guide pin and the negative electrode guide pin to pass through. The ultrasonic detection device according to claim 1, wherein the package body is adhered to the surrounding side wall. The ultrasonic detection device according to claim 1, wherein the package has a surrounding shape conformal to the surrounding side wall. The ultrasonic detection device according to claim 1, wherein the piezoelectric component further includes a matching layer or a conductive layer disposed on the sensing surface of the piezoelectric sheet and corresponding to the vibration energy of the piezoelectric sheet. The ultrasonic detection device according to claim 1, wherein each of the fixing members is a screw, the plate body has a plurality of perforations, and the top wall has a plurality of screw holes. The ultrasonic detection device according to claim 1, further comprising an outer frame and a cover body, the outer frame surrounds and connects the top wall and the surrounding side wall of the housing cover, and extends away from the bottom wall, And the end away from the bottom wall has an opening, and the cover closes the opening. The ultrasonic detection device according to claim 10, further comprising a reflecting plate and a plurality of connecting rods, the reflecting plate is disposed opposite to the housing cover and the outer frame, and each of the connecting rods is connected to the reflecting plate and Between the outer frames. The ultrasonic detection device according to claim 1, wherein the package includes a matching layer and/or an absorption layer corresponding to the vibration energy of the piezoelectric sheet.

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