Piezoelectric vibrator and piezoelectric pump

Abstract

The embodiment of the utility model relates to the technical field of piezoelectric pumps, and particularly discloses a piezoelectric vibrator and a piezoelectric pump. The flexible circuit board comprises a base part, a connecting part and a connecting flat cable, the base part is in a flat plate shape, and the piezoelectric ceramic is electrically connected to the base part in an attached mode; and one end of the connecting flat cable is electrically connected with the base part so as to supply power to the base part. The other end of the connecting flat cable extends towards the direction far away from the base part; the connecting part surrounds the outer edge of the base part, and the connecting part tilts relative to the base part, so that the flexible circuit board has a certain prestress, and the amplitude of the piezoelectric vibrator can be increased. When the piezoelectric vibrator is applied to the piezoelectric air pump, the flow of the piezoelectric air pump can be increased.

Description

Technical Field

[0001] The embodiments of the utility model relate to the field of piezoelectric pumps, and in particular to a piezoelectric vibrator and a piezoelectric pump. Background Art

[0002] A piezoelectric pump is a new type of fluid driver. It uses the inverse piezoelectric effect of piezoelectric ceramics to deform the piezoelectric vibrator, which then causes a volume change in the pump chamber to achieve fluid output or uses the piezoelectric vibrator to generate fluctuations to transmit liquid.

[0003] The flow rate output by the piezoelectric pump is related to the amplitude of the piezoelectric vibrator. In the prior art, the amplitude of the piezoelectric vibrator of the piezoelectric pump is relatively small, resulting in a relatively small flow rate output by the piezoelectric pump. Utility Model Content

[0004] The embodiments of the present utility model provide a piezoelectric vibrator and a piezoelectric pump, which aim to solve the problem that the amplitude of the piezoelectric vibrator is relatively small.

[0005] In order to solve the above technical problems, a technical solution adopted by the present invention is to provide a piezoelectric vibrator, comprising:

[0006] Piezoelectric ceramics;

[0007] A flexible circuit board includes a base, a connecting portion, and a connecting cable. The base is flat, and the piezoelectric ceramic is bonded and electrically connected to the base. One end of the connecting cable is electrically connected to the base, and the other end extends away from the base. The connecting portion surrounds the outer edge of the base and is tilted relative to the base.

[0008] Optionally, the piezoelectric ceramic and the base are both circular.

[0009] Optionally, the angle at which the connecting portion is tilted relative to the base is A, and 6°≤A≤10°.

[0010] Optionally, a weight-increasing piece is further included, the weight-increasing piece is made of metal, the weight-increasing piece is located on the side of the base away from the piezoelectric ceramic, and the thermal expansion coefficient of the weight-increasing piece is different from the thermal expansion coefficient of the piezoelectric ceramic.

[0011] Optionally, the base has a first conductive sheet and a second conductive sheet, the second conductive sheet is arranged around the first conductive sheet, and the second conductive sheet and the first conductive sheet are arranged with an insulating space therebetween;

[0012] The piezoelectric ceramic includes a first part and a second part. The second part is arranged around the first part and is insulated from the first part. The second part is electrically connected to the second conductive sheet, and the first part is electrically connected to the first conductive sheet.

[0013] Optionally, a first bonding hole for filling with adhesive is formed on a side of the first conductive sheet facing the first portion, and the first portion and the first conductive sheet are bonded to each other via the adhesive.

[0014] Optionally, a second bonding hole for filling with adhesive is provided on a side of the first conductive sheet facing the weight-increasing member, and the first conductive sheet and the weight-increasing member are bonded to each other by the adhesive.

[0015] Optionally, the connecting cable has an exposed positive electrode sheet and a exposed negative electrode sheet, the first conductive sheet is electrically connected to any one of the positive electrode sheet and the negative electrode sheet, and the second conductive sheet is electrically connected to the other one of the positive electrode sheet and the negative electrode sheet.

[0016] The utility model also provides a piezoelectric pump, comprising:

[0017] case;

[0018] The piezoelectric vibrator according to any one of the above items is housed in the housing.

[0019] Optionally, a first cavity and a second cavity are respectively provided on two sides of the piezoelectric vibrator.

[0020] The beneficial effects of the embodiments of the present invention are as follows: Different from the prior art, the piezoelectric vibrator in the present invention includes a piezoelectric ceramic and a flexible circuit board, wherein the flexible circuit board is used to provide electrical connection, and the piezoelectric ceramic is an information functional ceramic material that can convert mechanical energy and electrical energy into each other, and the piezoelectric ceramic is arranged on one side of the flexible circuit board. The flexible circuit board includes a base, a connecting portion and a connecting cable, the base is flat, the piezoelectric ceramic is attached to the base, and the piezoelectric ceramic is electrically connected to the base. One end of the connecting cable is electrically connected to the base to supply power to the base. The other end of the connecting cable extends in a direction away from the base. The connecting portion is connected to the base, and the connecting portion is arranged around the base. The connecting portion is tilted relative to the base, so that the flexible circuit board has a certain prestress, which can increase the amplitude of the piezoelectric vibrator. When the piezoelectric vibrator proposed in this application is applied to a piezoelectric pump, the flow rate of the piezoelectric pump can be increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly describes the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0022] Figure 1 This is a schematic structural diagram of a piezoelectric vibrator in one embodiment of the present utility model;

[0023] Figure 2 This is an exploded schematic diagram of a piezoelectric vibrator in one embodiment of the present invention;

[0024] Figure 3 yes Figure 2 Side view of;

[0025] Figure 4 This is a schematic structural diagram of a flexible circuit board of a piezoelectric vibrator in one embodiment of the present invention;

[0026] Figure 5 yes Figure 4 Enlarged schematic diagram of the S part.

[0027] Description of reference numerals:

[0028] 100. Piezoelectric vibrator; 1. Piezoelectric ceramic; 11. First part; 12. Second part; 2. Flexible circuit board; 21. Base; 211. First conductive sheet; 2111. First bonding hole; 2112. Second bonding hole; 212. Second conductive sheet; 22. Connecting part; 23. Connecting cable; 3. Weight-increasing member. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this specification are for illustrative purposes only.

[0030] Unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art to which this utility model belongs. The terms used in this specification and in the description of this utility model are only for the purpose of describing specific embodiments and are not intended to limit the utility model. The term "and / or" used in this specification includes any and all combinations of one or more of the relevant listed items.

[0031] See also Figure 1The present invention provides a piezoelectric vibrator 100, comprising a piezoelectric ceramic 1, a flexible circuit board 2, and a weighting member 3. The flexible circuit board 2 provides electrical connections, while the piezoelectric ceramic 1 is an information-functional ceramic material capable of converting mechanical energy into electrical energy. The piezoelectric ceramic 1 is disposed on one side of the flexible circuit board 2. The weighting member 3 is disposed on the other side of the flexible circuit board 2, facing the piezoelectric ceramic 1.

[0032] See also Figure 2 and Figure 3 The flexible printed circuit board (FPC) 2 is a highly reliable and flexible printed circuit board made from polyimide or polyester film. It features high wiring density, light weight, thin thickness, and excellent bendability. The flexible circuit board 2 is roughly disc-shaped and includes a base 21, a connecting portion 22, and connecting cables 23. The base 21 is the main portion of the flexible circuit board 2 and is flat. The piezoelectric ceramic 1 is attached to the base 21 and is electrically connected to the base 21. The circular shape of the piezoelectric ceramic 1 and the base 21 allows the piezoelectric ceramic 1 to adhere well to the base 21.

[0033] The base 21 includes a first conductive sheet 211 and a second conductive sheet 212. The first conductive sheet 211 is generally circular. The second conductive sheet 212 is generally annular and surrounds the first conductive sheet 211. The second conductive sheet 212 and the first conductive sheet 211 are insulated from each other. Specifically, the insulation between the second conductive sheet 212 and the first conductive sheet 211 can be achieved by spacing them apart or interposing an insulator.

[0034] See also Figure 3 Correspondingly, the piezoelectric ceramic 1 includes a first portion 11 and a second portion 12. The first portion 11 is roughly disc-shaped and is arranged corresponding to the first conductive sheet 211. The second portion 12 is roughly ring-shaped and is arranged corresponding to the second conductive sheet 212. The second portion 12 is arranged around the first portion 11, and the second portion 12 and the first portion 11 are insulated from each other. Specifically, the insulation between the second portion 12 and the first portion 11 can be achieved by spacing or sandwiching an insulator. The second portion 12 is electrically connected to the second conductive sheet 212, and the first portion 11 is electrically connected to the first conductive sheet 211 to power the piezoelectric ceramic 1.

[0035] Please refer again Figure 2 and Figure 3A first bonding hole 2111 is defined on the side of the first conductive sheet 211 facing the first portion 11. The first bonding hole 2111 is used to be filled with adhesive. The first portion 11 and the first conductive sheet 211 are bonded together using adhesive, allowing the first portion 11 to be mounted on the first conductive sheet 211. Furthermore, compared to applying adhesive directly between the first portion 11 and the first conductive sheet 211, providing the first bonding hole 2111 filled with adhesive can reduce the barrier between the first portion 11 and the first conductive sheet 211 caused by the adhesive, reduce the effect of the adhesive on the electrical connection between the first portion 11 and the first conductive sheet 211, and increase adhesion.

[0036] A second adhesive hole 2112 is defined on the side of the first conductive sheet 211 facing the weight-increasing member 3. This second adhesive hole 2112 is used to fill with adhesive. The weight-increasing member 3 and the first conductive sheet 211 are bonded together using the adhesive, allowing the weight-increasing member 3 to be mounted on the first conductive sheet 211. Furthermore, compared to applying adhesive directly between the weight-increasing member 3 and the first conductive sheet 211, providing the second adhesive hole 2112 for filling with adhesive reduces the adhesive's barrier between the weight-increasing member 3 and the first conductive sheet 211, thereby reducing the adhesive's effect on the electrical connection between the weight-increasing member 3 and the first conductive sheet 211.

[0037] See also Figure 2 The connecting cable 23 is roughly in the shape of a long strip. The connecting cable 23 is a conductor. One end of the connecting cable 23 is electrically connected to the base 21 to supply power to the base 21; the other end of the connecting cable 23 extends in a direction away from the base 21. The other end of the connecting cable 23 is used to connect to an external power source to supply power to the base 21.

[0038] The connecting cable 23 has an exposed positive electrode sheet (not shown) and a negative electrode sheet (not shown). The first conductive sheet 211 is electrically connected to either the positive electrode sheet or the negative electrode sheet, and the second conductive sheet 212 is electrically connected to the other of the positive electrode sheet or the negative electrode sheet to supply power to the base 21 through the connecting cable 23.

[0039] In some embodiments, the first conductive sheet 211 is electrically connected to the positive electrode sheet, and the second conductive sheet 212 is electrically connected to the negative electrode sheet, so as to supply power to the base 21 through the connecting cable 23 .

[0040] In other embodiments, the first conductive sheet 211 is electrically connected to the negative electrode sheet, and the second conductive sheet 212 is electrically connected to the positive electrode sheet, so as to supply power to the base 21 through the connecting cable 23 .

[0041] See also Figure 4 and Figure 5The connecting portion 22 is generally annular and connected to the base 21, surrounding the base 21. The connecting portion 22 is tilted relative to the base 21, imparting a certain amount of prestress to the flexible circuit board 2, thereby increasing the amplitude of the piezoelectric vibrator 100. When the piezoelectric vibrator 100 proposed in this application is applied to a piezoelectric pump, the flow rate of the piezoelectric pump can be increased. The angle A between the connecting portion 22 and the base 21 is 6°≤A≤10°, which provides the flexible circuit board 2 with a better prestress.

[0042] In some embodiments, the connecting portion 22 is tilted toward one side of the piezoelectric ceramic 1 so that the angle A between the connecting portion 22 and the base 21 satisfies: 6°≤A≤10°.

[0043] In other embodiments, the connecting portion 22 is tilted toward one side of the metal sheet, so that the angle A between the connecting portion 22 and the base portion 21 satisfies: 6°≤A≤10°.

[0044] See also Figures 1 to 3 The weight member 3 is generally disc-shaped and made of metal. It is located on the side of the base 21 facing away from the piezoelectric ceramic 1. The installation of the weight member 3 increases the total weight of the piezoelectric vibrator 100. The coefficient of thermal expansion of the weight member 3 differs from that of the piezoelectric ceramic 1. Since the weight member 3 and the piezoelectric ceramic 1 are in the same environment, when heated, the difference in thermal expansion coefficients between the weight member 3 and the piezoelectric ceramic 1 can further increase the amplitude of the piezoelectric vibrator 100.

[0045] In summary, the present invention provides a piezoelectric vibrator 100, which includes a piezoelectric ceramic 1 and a flexible circuit board 2. The flexible circuit board 2 is used to provide electrical connection. The piezoelectric ceramic 1 is an information-functional ceramic material capable of converting mechanical energy into electrical energy. The piezoelectric ceramic 1 is disposed on one side of the flexible circuit board 2. The flexible circuit board 2 includes a base 21, a connecting portion 22, and a connecting cable 23. The base 21 is flat, and the piezoelectric ceramic 1 is attached to the base 21 and electrically connected to the base 21. The piezoelectric ceramic 1 and the base 21 are both circular, allowing the piezoelectric ceramic 1 to adhere well to the base 21. One end of the connecting cable 23 is electrically connected to the base 21 to supply power to the base 21. The other end of the connecting cable 23 extends away from the base 21. The connecting portion 22 is connected to the base 21 and is disposed around the base 21. The connection portion 22 is tilted relative to the base portion 21, so that the flexible circuit board 2 has a certain prestress, which can increase the amplitude of the piezoelectric vibrator 100. When the piezoelectric vibrator 100 proposed in this application is applied to a piezoelectric pump, the flow rate of the piezoelectric pump can be increased.

[0046] The present invention further provides a piezoelectric pump (not shown), which includes a housing (not shown) and the piezoelectric vibrator 100 . The piezoelectric vibrator 100 is accommodated in the housing.

[0047] Specifically, the piezoelectric vibrator 100 divides the space within the housing into a first chamber and a second chamber. The first and second chambers are not connected to each other. When the piezoelectric pump is operating, the piezoelectric vibrator 100 vibrates, transferring air from the first chamber to the second chamber, or vice versa. By connecting the first and second chambers to external pipes, the piezoelectric pump can achieve directional gas delivery.

[0048] It should be noted that the preferred embodiments of the present invention are given in the specification and drawings of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. These embodiments do not serve as additional limitations on the content of the present invention. The purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. In addition, the above-mentioned technical features continue to be combined with each other to form various embodiments not listed above, which are all considered to be within the scope of the description of the present invention; further, it is obvious to those skilled in the art that improvements or changes can be made based on the above description, and all such improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A piezoelectric vibrator, characterized in that: include: Piezoelectric ceramics; The flexible circuit board includes a base, a connecting portion, and a connecting cable. The base is in a flat plate shape, and the piezoelectric ceramic is bonded and electrically connected to the base. One end of the connecting cable is electrically connected to the base, and the other end extends in a direction away from the base; the connecting portion surrounds the outer edge of the base, and the connecting portion is tilted relative to the base.

2. The piezoelectric vibrator according to claim 1, wherein The piezoelectric ceramic and the base are both circular.

3. The piezoelectric vibrator according to claim 1, wherein The angle of the connecting portion relative to the base portion is A, 6°≤A≤10°.

4. The piezoelectric vibrator according to claim 1, wherein It also includes a weight-increasing piece, which is made of metal and is located on a side of the base away from the piezoelectric ceramic. The thermal expansion coefficient of the weight-increasing piece is different from that of the piezoelectric ceramic.

5. The piezoelectric vibrator according to claim 4, wherein: The base has a first conductive sheet and a second conductive sheet, wherein the second conductive sheet is arranged around the first conductive sheet, and the second conductive sheet and the first conductive sheet are insulated and spaced apart from each other; The piezoelectric ceramic includes a first part and a second part. The second part is arranged around the first part and is insulated from the first part. The second part is electrically connected to the second conductive sheet, and the first part is electrically connected to the first conductive sheet.

6. The piezoelectric vibrator according to claim 5, wherein: A first bonding hole for filling with adhesive is formed on a side of the first conductive sheet facing the first portion, and the first portion and the first conductive sheet are bonded to each other by the adhesive.

7. The piezoelectric vibrator according to claim 6, wherein: A second bonding hole for filling an adhesive is provided on a side of the first conductive sheet facing the weight-increasing member, and the first conductive sheet and the weight-increasing member are bonded to each other by the adhesive.

8. The piezoelectric vibrator according to claim 5, wherein The connecting cable has an exposed positive electrode sheet and a exposed negative electrode sheet, the first conductive sheet is electrically connected to any one of the positive electrode sheet and the negative electrode sheet, and the second conductive sheet is electrically connected to the other one of the positive electrode sheet and the negative electrode sheet.

9. A piezoelectric pump, characterized in that: include: case; The piezoelectric vibrator according to any one of claims 1 to 8, wherein the piezoelectric vibrator is housed in the housing.

10. The piezoelectric pump according to claim 9, wherein A first cavity and a second cavity are respectively provided on both sides of the piezoelectric vibrator.

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