Piezoelectric sensor structure

Abstract

The utility model relates to the technical field of sensors, and discloses a piezoelectric sensor structure, which comprises a first metal sheet, a second metal sheet, a first piezoelectric body and a second piezoelectric body, the middle part of the first metal sheet protrudes outwards, the left side part of the first metal sheet is in contact connection with the upper end face of the first piezoelectric body, and the right side part of the first metal sheet is in contact connection with the upper end face of the second piezoelectric body; the middle part of the second metal sheet protrudes outwards, the left side part of the second metal sheet is in contact connection with the lower end face of the first piezoelectric body, and the right side part of the second metal sheet is in contact connection with the lower end face of the second piezoelectric body. According to the piezoelectric sensor structure, by changing the shapes of the first metal sheet and the second metal sheet, the contact area between the first metal sheet and the external medium and the contact area between the second metal sheet and the external medium are increased, so that the acting force on the first piezoelectric body and the second piezoelectric body is increased, and the sensitivity of the whole piezoelectric sensor structure is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a piezoelectric sensor structure. Background Art

[0002] A piezoelectric sensor is a sensor made using the piezoelectric effect. It can convert the measured physical quantity (such as pressure, force, acceleration, vibration, etc.) into an electrical signal output. Piezoelectric sensors generally compress piezoelectric materials through metal sheets, and the piezoelectric material undergoes force and changes in electrical signals. In related technologies, the metal sheet is generally a plane, and the external force acts on the flat surface of the metal sheet, and the force is transmitted to the piezoelectric material. For some "fluidized" pressure transmission (air pressure or water pressure), the pressure conversion sensitivity of the existing pressure sensor structure is not high. Therefore, how to construct a highly sensitive piezoelectric sensor structure is a technical problem that needs to be solved urgently in the industry. Utility Model Content

[0003] The purpose of the utility model is to provide a piezoelectric sensor structure to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0004] The utility model solves the technical problem by providing a piezoelectric sensor structure, including a first metal sheet, a second metal sheet, a first piezoelectric body and a second piezoelectric body;

[0005] The middle portion of the first metal sheet is convex outward, the left side of the first metal sheet is in contact with the upper end surface of the first piezoelectric body, and the right side of the first metal sheet is in contact with the upper end surface of the second piezoelectric body;

[0006] The middle portion of the second metal sheet is convex outward, the left side of the second metal sheet is in contact with the lower end surface of the first piezoelectric body, and the right side of the second metal sheet is in contact with the lower end surface of the second piezoelectric body.

[0007] Further, the first metal sheet includes: a first flat portion, a first inclined portion, a second flat portion, a second inclined portion and a third flat portion, one side of the first flat portion is connected to one side of the first inclined portion, the other side of the first inclined portion is connected to one side of the second flat portion, the other side of the second flat portion is connected to one side of the second inclined portion, and the other side of the second inclined portion is connected to one side of the third flat portion;

[0008] The first flat portion is the left side of the first metal sheet, the first inclined portion, the second flat portion and the second inclined portion form the middle portion of the first metal sheet, and the third flat portion is the right side of the first metal sheet;

[0009] The lower side surface of the first flattening portion is in contact connection with the upper end surface of the first piezoelectric body, and the lower side surface of the third flattening portion is in contact connection with the upper end surface of the second piezoelectric body.

[0010] Furthermore, the second metal sheet includes: a fourth flattening portion, a third inclined portion, a fifth flattening portion, a fourth inclined portion, and a sixth flattening portion. One side edge of the fourth flattening portion is connected to one side edge of the third inclined portion, the other side edge of the third inclined portion is connected to one side edge of the fifth flattening portion, the other side edge of the fifth flattening portion is connected to one side edge of the fourth inclined portion, and the other side edge of the fourth inclined portion is connected to one side edge of the sixth flattening portion;

[0011] The fourth flattening portion is the left side portion of the second metal sheet, the third inclined portion, the fifth flattening portion, and the fourth inclined portion form the middle portion of the second metal sheet, and the sixth flattening portion is the right side portion of the second metal sheet;

[0012] The lower side surface of the fourth flattening portion is in contact connection with the lower end surface of the first piezoelectric body, and the lower side surface of the sixth flattening portion is in contact connection with the lower end surface of the second piezoelectric body.

[0013] Furthermore, a first recess array is distributed and arranged on the outer side surface of the first metal sheet.

[0014] Furthermore, a second recess array is distributed and arranged on the outer side surface of the second metal sheet.

[0015] Furthermore, the first recess array includes a plurality of first unit recesses, and the plurality of first unit recesses are arranged on the outer side surface of the first metal sheet by an array distribution method.

[0016] Furthermore, the second recess array includes a plurality of second unit recesses, and the plurality of second unit recesses are arranged on the outer side surface of the second metal sheet by an array distribution method.

[0017] Furthermore, the size of the first unit recess is equal to the size of the second unit recess.

[0018] Furthermore, the first piezoelectric body is a component made of piezoelectric ceramic material.

[0019] Furthermore, the second piezoelectric body is a component made of piezoelectric ceramic material.

[0020] The beneficial effect of the present utility model is that: by changing the shapes of the first metal sheet and the second metal sheet in the piezoelectric sensor structure, the contact areas of the first metal sheet and the second metal sheet with the external medium are increased, thereby increasing the acting forces on the first piezoelectric body and the second piezoelectric body, and thus improving the sensitivity of the entire piezoelectric sensor structure. Description of the Drawings

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the described drawings are only a part of the embodiments of the present invention, rather than all embodiments. Without creative work, those skilled in the art can also obtain other design solutions and drawings based on these drawings.

[0022] Figure 1 is a schematic structural diagram of a piezoelectric sensor structure;

[0023] Figure 2 is a schematic structural diagram of an embodiment of a piezoelectric sensor structure;

[0024] Figure 3 is a schematic structural diagram of another embodiment of a piezoelectric sensor structure. Specific Embodiments

[0025] In order to make the objectives, technical solutions and advantages of the present application clearer, the following further details the present application in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application.

[0026] It should be noted that although functional module division is performed in the system schematic diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order from the module division in the system or the order in the flowchart. Terms such as "first" and "second" in the description, claims and the above drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence.

[0027] Refer to Figure 1 、 Figure 2 and Figure 3 . Among them, Figure 1 is a schematic structural diagram of a piezoelectric sensor structure. Figure 2 is a schematic structural diagram of an embodiment of a piezoelectric sensor structure. Figure 3 is a schematic structural diagram of another embodiment of a piezoelectric sensor structure.

[0028] The present application mainly provides a piezoelectric sensor structure with relatively high pressure conversion sensitivity.

[0029] To achieve this technical goal, the present application provides a piezoelectric sensor structure, including: a first metal sheet 100, a second metal sheet 200, a first piezoelectric body 201, and a second piezoelectric body 202.

[0030] The first metal sheet 100 and the second metal sheet 200 serve as components for the contact pressure of the piezoelectric sensor structure. The first piezoelectric body 201 and the second piezoelectric body 202 serve as components in the piezoelectric sensor structure that convert pressure into electrical signals. Among them, the first piezoelectric body 201 and the second piezoelectric body 202 are made of materials with piezoelectric effects. The piezoelectric effect refers to the phenomenon that when certain dielectrics are subjected to mechanical pressure, electric charges will be generated on their surfaces. When these dielectrics are deformed by external forces along a certain direction, polarization phenomena will occur inside them, and at the same time, positive and negative charges with opposite polarities will appear on their two opposite surfaces. When the external force is removed, it will return to the uncharged state.

[0031] In some further specific embodiments, the first piezoelectric body 201 is a component made of piezoelectric ceramic material. The second piezoelectric body 202 is a component made of piezoelectric ceramic material.

[0032] The middle part of the first metal sheet 100 is convex outward. The left side of the first metal sheet 100 is in contact connection with the upper end surface of the first piezoelectric body 201, and the right side of the first metal sheet 100 is in contact connection with the upper end surface of the second piezoelectric body 202.

[0033] The middle part of the second metal sheet 200 is convex outward. The left side of the second metal sheet 200 is in contact connection with the lower end surface of the first piezoelectric body 201, and the right side of the second metal sheet 200 is in contact connection with the lower end surface of the second piezoelectric body 202.

[0034] When this piezoelectric sensor structure works, an external medium (such as air or water) acts on the first metal sheet 100 or the second metal sheet 200. Since the middle part of the first metal sheet 100 or the second metal sheet 200 is convex outward. Compared with the planar method, the contact area between the first metal sheet 100 or the second metal sheet 200 and the external medium is larger. Since the external medium acts on the first metal sheet 100 or the second metal sheet 200 in a particle manner. Since the contact area between the external medium and the first metal sheet 100 or the second metal sheet 200 is larger, therefore, the acting force that the first metal sheet 100 or the second metal sheet 200 can act on the first piezoelectric body 201 and the second piezoelectric body 202 will increase. In this way, the first piezoelectric body 201 and the second piezoelectric body 202 will generate a more obvious piezoelectric effect. Thus, the sensitivity of the entire piezoelectric sensor structure is improved.

[0035] This piezoelectric sensor structure increases the contact area between the first metal sheet 100 and the second metal sheet 200 and the external medium by changing the shapes of the first metal sheet 100 and the second metal sheet 200, thereby increasing the acting force on the first piezoelectric body 201 and the second piezoelectric body 202, and thus improving the sensitivity of the entire piezoelectric sensor structure.

[0036] For the structure of the first metal sheet 100, in some further specific embodiments, the first metal sheet 100 includes: a first flat portion 101, a first inclined portion 111, a second flat portion 102, a second inclined portion 112, and a third flat portion 103.

[0037] One side edge of the first flat portion 101 is connected to one side edge of the first inclined portion 111, another side edge of the first inclined portion 111 is connected to one side edge of the second flat portion 102, another side edge of the second flat portion 102 is connected to one side edge of the second inclined portion 112, and another side edge of the second inclined portion 112 is connected to one side edge of the third flat portion 103.

[0038] The first flat portion 101 is the left side portion of the first metal sheet 100, the first inclined portion 111, the second flat portion 102, and the second inclined portion 112 form the middle part of the first metal sheet 100, and the third flat portion 103 is the right side portion of the first metal sheet 100.

[0039] Through the connection of the first inclined portion 111, the second flat portion 102, and the second inclined portion 112, an outwardly convex state of the first metal sheet 100 is formed. Due to the outwardly convex state formed by the first inclined portion 111, the second flat portion 102, and the second inclined portion 112, the outer side surface of the first metal sheet 100 has a larger area relative to the flat form.

[0040] The lower side surface of the first flat portion 101 is in contact connection with the upper end surface of the first piezoelectric body 201, and the lower side surface of the third flat portion 103 is in contact connection with the upper end surface of the second piezoelectric body 202.

[0041] For the structure of the second metal sheet 200, in some further specific embodiments, the second metal sheet 200 includes: a fourth flat portion 104, a third inclined portion 113, a fifth flat portion 105, a fourth inclined portion 114, and a sixth flat portion 106.

[0042] One side edge of the fourth flat portion 104 is connected to one side edge of the third inclined portion 113, another side edge of the third inclined portion 113 is connected to one side edge of the fifth flat portion 105, another side edge of the fifth flat portion 105 is connected to one side edge of the fourth inclined portion 114, and another side edge of the fourth inclined portion 114 is connected to one side edge of the sixth flat portion 106.

[0043] The fourth flat portion 104 is the left side portion of the second metal sheet 200, the third inclined portion 113, the fifth flat portion 105, and the fourth inclined portion 114 form the middle part of the second metal sheet 200, and the sixth flat portion 106 is the right side portion of the second metal sheet 200.

[0044] Through the connection of the third inclined portion 113, the fifth flat portion 105, and the fourth inclined portion 114, an outward convex state of the second metal sheet 200 is formed. Due to the outward convex state formed by the third inclined portion 113, the fifth flat portion 105, and the fourth inclined portion 114, the outer side surface of the second metal sheet 200 has a larger area relative to the flat form.

[0045] The lower side surface of the fourth flat portion 104 is in contact connection with the lower end surface of the first piezoelectric body 201, and the lower side surface of the sixth flat portion 106 is in contact connection with the lower end surface of the second piezoelectric body 202.

[0046] In order to further increase the acting area between the outer side surface of the first metal sheet 100 and the external medium. Therefore, in some further specific embodiments, a first recess array 301 is distributed and arranged on the outer side surface of the first metal sheet 100. Among them, the first recess array 301 is composed of a plurality of first unit recesses. The plurality of first unit recesses are distributed on the outer side surface of the first metal sheet 100 in an array form.

[0047] In order to further increase the acting area between the outer side surface of the second metal sheet 200 and the external medium. Therefore, in some further specific embodiments, a second recess array 302 is distributed and arranged on the outer side surface of the second metal sheet 200. Among them, the second recess array 302 is composed of a plurality of second unit recesses. The plurality of second unit recesses are distributed on the outer side surface of the second metal sheet 200 in an array form.

[0048] Reference Figure 2 , in some further specific embodiments, the sensor structure is provided with a first unit recess array 301 in the first metal sheet 100. Reference Figure 3 , in some further specific embodiments, in addition to the sensor structure being provided with a first recess array 301 in the first metal sheet 100. The sensor structure is provided with a second recess array 302 in the second metal sheet 200.

[0049] For the convenience of manufacturing, the size of the first unit recess is equal to the size of the second unit recess.

[0050] The above has specifically described the preferred embodiments of the present invention, but the present invention is not limited to the described embodiments. Those skilled in the art can also make various equivalent variations or substitutions without departing from the spirit of the present invention, and these equivalent variations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A piezoelectric sensor structure, characterized in that: include: A first metal sheet (100), a second metal sheet (200), a first piezoelectric body (201), and a second piezoelectric body (202); The middle portion of the first metal sheet (100) is in an outwardly convex shape, the left side portion of the first metal sheet (100) is in contact with and connected to the upper end surface of the first piezoelectric body (201), and the right side portion of the first metal sheet (100) is in contact with and connected to the upper end surface of the second piezoelectric body (202); The middle portion of the second metal sheet (200) is in an outwardly convex shape, the left side portion of the second metal sheet (200) is in contact with and connected to the lower end surface of the first piezoelectric body (201), and the right side portion of the second metal sheet (200) is in contact with and connected to the lower end surface of the second piezoelectric body (202).

2. A piezoelectric sensor structure according to claim 1, characterized in that: The first metal sheet (100) comprises: a first flat portion (101), a first inclined portion (111), a second flat portion (102), a second inclined portion (112) and a third flat portion (103), one side of the first flat portion (101) being connected to one side of the first inclined portion (111), the other side of the first inclined portion (111) being connected to one side of the second flat portion (102), the other side of the second flat portion (102) being connected to one side of the second inclined portion (112), and the other side of the second inclined portion (112) being connected to one side of the third flat portion (103); The first flat portion (101) is the left side portion of the first metal sheet (100), the first inclined portion (111), the second flat portion (102) and the second inclined portion (112) form the middle portion of the first metal sheet (100), and the third flat portion (103) is the right side portion of the first metal sheet (100); The lower side surface of the first flat portion (101) is in contact with and connected to the upper end surface of the first piezoelectric body (201), and the lower side surface of the third flat portion (103) is in contact with and connected to the upper end surface of the second piezoelectric body (202).

3. A piezoelectric sensor structure according to claim 1, characterized in that: The second metal sheet (200) comprises: a fourth flat portion (104), a third inclined portion (113), a fifth flat portion (105), a fourth inclined portion (114) and a sixth flat portion (106), one side of the fourth flat portion (104) being connected to one side of the third inclined portion (113), the other side of the third inclined portion (113) being connected to one side of the fifth flat portion (105), the other side of the fifth flat portion (105) being connected to one side of the fourth inclined portion (114), and the other side of the fourth inclined portion (114) being connected to one side of the sixth flat portion (106); The fourth flat portion (104) is the left side portion of the second metal sheet (200), the third inclined portion (113), the fifth flat portion (105) and the fourth inclined portion (114) form the middle portion of the second metal sheet (200), and the sixth flat portion (106) is the right side portion of the second metal sheet (200); The lower side surface of the fourth flat portion (104) is in contact with and connected to the lower end surface of the first piezoelectric body (201), and the lower side surface of the sixth flat portion (106) is in contact with and connected to the lower end surface of the second piezoelectric body (202).

4. A piezoelectric sensor structure according to claim 1, characterized in that: A first recessed body array (301) is distributed on the outer side surface of the first metal sheet (100).

5. A piezoelectric sensor structure according to claim 4, characterized in that: A second recessed body array (302) is distributed on the outer side surface of the second metal sheet (200).

6. A piezoelectric sensor structure according to claim 5, characterized in that: The first recessed body array (301) comprises a plurality of first unit recessed bodies, and the plurality of first unit recessed bodies are arranged on the outer side surface of the first metal sheet (100) in an array distribution manner.

7. A piezoelectric sensor structure according to claim 6, characterized in that: The second recessed body array (302) comprises a plurality of second unit recessed bodies, and the plurality of second unit recessed bodies are arranged on the outer side surface of the second metal sheet (200) in an array distribution manner.

8. A piezoelectric sensor structure according to claim 7, characterized in that: The size of the first unit recessed body is equal to the size of the second unit recessed body.

9. A piezoelectric sensor structure according to claim 1, characterized in that: The first piezoelectric body (201) is a component made of piezoelectric ceramic material.

10. The piezoelectric sensor structure according to claim 1, characterized in that: The second piezoelectric body (202) is a component made of piezoelectric ceramic material.

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