Piezoelectric micropump and heat dissipation system

Abstract

This utility model discloses a piezoelectric micropump and its heat dissipation system. The piezoelectric micropump includes a housing with an inner cavity, an inlet and an outlet communicating with the inner cavity; and a drive assembly installed in the inner cavity, which is deformable to achieve the intake and exhaust of fluid in the inner cavity. The drive assembly includes a vibrating plate and a piezoelectric sheet, the piezoelectric sheet being adhered to the vibrating plate. Two drive assemblies are provided, located on opposite sides of the inner cavity, and both drive assemblies are capable of synchronously deforming in opposite directions. By arranging two drive assemblies opposite each other in the inner cavity, and allowing them to deform synchronously in opposite directions, the flow rate and velocity of the fluid in the inner cavity can be increased, thereby improving the working efficiency of the piezoelectric micropump.

Description

Technical Field

[0001] This utility model relates to the field of heat dissipation system technology, and more specifically, to a piezoelectric micropump and heat dissipation system. Background Technology

[0002] In related technologies, piezoelectric pneumatic pumps generally use an oscillator as the driving component. The oscillator mainly utilizes the inverse piezoelectric effect of piezoelectric materials, converting electrical signals into mechanical deformation to rapidly change the volume of gas within the cavity, thereby drawing fluid into or expelling fluid from the cavity. However, current piezoelectric micropumps have relatively low operating efficiency.

[0003] Therefore, a new technical solution is needed to solve the above-mentioned technical problems. Utility Model Content

[0004] One objective of this invention is to provide a new technical solution for piezoelectric micropumps.

[0005] According to a first aspect of the present invention, a piezoelectric micropump is provided. The piezoelectric micropump comprises: A housing having an inner cavity, the housing having an inlet and an outlet communicating with the inner cavity; A drive assembly is installed in the inner cavity. The drive assembly includes a vibrating plate and a piezoelectric sheet. The piezoelectric sheet is bonded to the vibrating plate. The drive assembly is deformable to realize the intake and discharge of fluid in the inner cavity. The drive assembly comprises two components, which are located on opposite sides of the inner cavity and are capable of synchronous reverse deformation.

[0006] Optionally, the housing includes two first sidewalls disposed opposite to each other, forming the cavity between the two first sidewalls, and the two drive assemblies are respectively disposed on the two first sidewalls.

[0007] Optionally, the vibrating plate is integrally formed with the first sidewall.

[0008] Optionally, at least a portion of the first sidewall is recessed inward to form a groove, the bottom wall of which forms the vibrating plate.

[0009] Optionally, the piezoelectric element is located within the groove.

[0010] Optionally, there is a gap between the piezoelectric sheet and the sidewall of the groove.

[0011] Optionally, the housing is provided with a plurality of the inner cavities at intervals, and each inner cavity is provided with two of the driving components.

[0012] Optionally, the drive components corresponding to two adjacent inner cavities are staggered; and / or, the two drive components corresponding to the inner cavities are coaxially arranged.

[0013] Optionally, the import and the export coincide.

[0014] According to a second aspect of the present invention, a heat dissipation system is provided. This heat dissipation system includes the piezoelectric micropump described in the above embodiments.

[0015] One of the technical advantages of this application is that by setting a driving component on each of the opposite sides of the inner cavity, the two driving components can deform synchronously in opposite directions, thereby increasing the flow rate and velocity of the fluid in the inner cavity and improving the working efficiency of the piezoelectric micropump.

[0016] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present invention and, together with their description, serve to explain the principles of the present invention.

[0018] Figure 1 This is a schematic diagram of the structure of a piezoelectric micropump according to an embodiment of this application.

[0019] Figure 2 This is a schematic diagram of the structure of a piezoelectric micropump according to another embodiment of this application.

[0020] Figure 3 This is a cross-sectional view of a piezoelectric micropump according to an embodiment of this application.

[0021] Figure 4 yes Figure 3 A partially enlarged view of the cross-sectional view of the piezoelectric micropump is shown.

[0022] Figure label: 1. Housing; 11. Inner cavity; 12. Outlet; 13. First sidewall; 131. Groove; 132. Elastic arm; 14. Second sidewall; 15. Partition; 2. Drive assembly; 21. Vibrating plate; 211. Hollowed-out part; 22. Piezoelectric sheet; 3. Gap. Detailed Implementation

[0023] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0024] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0025] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0026] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0028] According to one embodiment of this application, a piezoelectric micropump is provided. For example... Figures 1 to 4 As shown, the piezoelectric micropump includes a housing 1 with an inner cavity 11, an inlet and an outlet 12 communicating with the inner cavity 11; and a drive assembly 2 installed in the inner cavity 11. The drive assembly 2 includes a vibrating plate 21 and a piezoelectric sheet 22, the piezoelectric sheet 22 being bonded to the vibrating plate 21. The drive assembly 2 is deformable to achieve the intake and exhaust of fluid in the inner cavity 11. There are two drive assemblies 2, which are located on opposite sides of the inner cavity 11, and the two drive assemblies 2 are capable of synchronously deforming in opposite directions.

[0029] In this example, by setting a drive component 2 on each of the opposite sides of the inner cavity 11, the two drive components 2 can deform synchronously in opposite directions, thereby increasing the flow rate and velocity of the fluid in the inner cavity 11 and improving the working efficiency of the piezoelectric micropump.

[0030] like Figure 1 and Figure 4 As shown, in this example, the shell 1 can be a hollow structure with an inner cavity 11 inside. The sidewalls of the shell 1 are provided with an inlet and an outlet 12 communicating with the inner cavity 11. A drive assembly 2 is provided on each of the opposite sides of the inner cavity 11; for example, a drive assembly 2 is provided on the upper and lower sides of the inner cavity 11. The drive assembly 2 can deform, thereby changing the volume of the inner cavity 11 to achieve the intake and discharge of fluid within the inner cavity 11. That is, the drive assembly 2 can bend outwards from the inner cavity 11, thereby increasing the volume of the inner cavity 11 to draw external fluid into the inner cavity 11 from the inlet; then, the drive assembly 2 can bend inwards from the inner cavity 11, thereby decreasing the volume of the inner cavity 11 to discharge the fluid from the inner cavity 11 from the outlet 12.

[0031] In this example, the two opposing drive components 2 can deform synchronously in opposite directions, thereby effectively increasing the volume change of the inner cavity 11. This facilitates increasing the flow rate and velocity of the fluid within the inner cavity 11, thus improving the working efficiency of the piezoelectric micropump. That is, as... Figure 4 As shown, when fluid is drawn into the inner cavity 11, the upper drive assembly 2 bends upward, while the lower drive assembly 2 bends downward, increasing the volume of the inner cavity 11 and drawing external fluid in through the inlet. When fluid is discharged outward, the upper drive assembly 2 bends downward, while the lower drive assembly 2 bends upward, decreasing the volume of the inner cavity 11 and discharging the fluid from the inner cavity 11 through the outlet 12.

[0032] The fluid can be air or liquid, which can be determined by those skilled in the art according to the actual situation, and no specific limitation is made here.

[0033] like Figure 4 As shown, in this example, the driving assembly 2 includes a vibrating plate 21 and a piezoelectric sheet 22. The vibrating plate 21 can be connected to the side wall of the housing 1. The piezoelectric sheet 22 can be bonded to one end of the vibrating plate 21 along its thickness direction using an adhesive such as epoxy resin. The piezoelectric sheet 22 exhibits the inverse piezoelectric effect; when an external electric field is applied to the piezoelectric sheet 22, its internal lattice structure deforms, causing the material as a whole to undergo mechanical deformation, i.e., elongation or contraction. When an alternating voltage is applied to the piezoelectric sheet 22, the piezoelectric sheet 22 will periodically elongate and contract. Since the piezoelectric sheet 22 is bonded to the vibrating plate 21, it drives the vibrating plate 21 to undergo bending vibration. That is, the driving assembly 2 as a whole can undergo bending vibration, thereby achieving a driving effect.

[0034] It should be noted that the piezoelectric sheet 22 can be bonded to the side of the vibrating plate 21 facing away from the inner cavity 11 to facilitate the bonding operation of the piezoelectric sheet 22. Alternatively, the piezoelectric sheet 22 can also be bonded to the side of the vibrating plate 21 facing the inner cavity 11 to provide a protective effect for the piezoelectric sheet 22. Those skilled in the art can decide according to the actual situation, and no specific limitation is made here.

[0035] like Figure 4 As shown, in this example, the vibrating plate 21 has a perforated portion 211 extending through it along the thickness direction. The piezoelectric sheet 22 is bonded to the vibrating plate 21 and can cover the perforated portion 211. By providing the perforated portion 211 on the vibrating plate 21, the weight of the vibrating plate 21 can be effectively reduced. Under the same voltage, the amplitude of the driving component 2 can be increased, which is beneficial to reducing the energy consumption of the piezoelectric micropump.

[0036] like Figure 3 and Figure 4As shown, in one example, the housing 1 includes two first sidewalls 13 disposed opposite to each other, forming the cavity 11 between the two first sidewalls 13, and the two drive components 2 are respectively disposed on the two first sidewalls 13.

[0037] like Figure 1 As shown, in this example, the housing 1 further includes a second sidewall 14, and two first sidewalls 13 are respectively connected to opposite ends of the second sidewall 14. The first sidewalls 13 and the second sidewalls 14 surround the housing 1 to form a hollow structure, and the interior of the housing 1 has an inner cavity 11. A drive assembly 2 is disposed on the first sidewall 13, and the drive assembly 2, together with the first sidewalls 13 and the second sidewalls 14, can surround the inner cavity 11 to form a cavity, so that the drive assembly 2 can change the volume of the inner cavity 11 by bending.

[0038] like Figure 1 As shown, in this example, the first sidewall 13 can be a rectangular plate structure, and four second sidewalls 14 are provided, which are connected end to end in sequence. The two ends of the second sidewalls 14 are respectively connected to the four sides of the two first sidewalls 13 to form a shell 1 with a prism structure.

[0039] Alternatively, the first sidewall 13 can be a circular plate structure, and the second sidewall 14 can be a corresponding cylindrical structure, with both ends of the second sidewall 14 connected to the two first sidewalls 13 along the axial direction. Of course, the specific shape of the shell 1 can be determined by those skilled in the art according to the actual situation, and no specific limitation is made here.

[0040] like Figure 4 As shown, in one example, the vibrating plate 21 is integrally formed with the first sidewall 13.

[0041] In this example, the vibrating plate 21 is integrally formed with the first sidewall 13, that is, the vibrating plate 21 is part of the first sidewall 13, and the piezoelectric sheet 22 is bonded to the first sidewall 13. Using a part of the first sidewall 13 as the vibrating plate 21 simplifies the processing procedure and helps to reduce production costs.

[0042] Alternatively, a clearance hole for avoiding the drive assembly 2 can be provided at a corresponding position on the first sidewall 13, with the drive assembly 2 located within the clearance hole and the vibrating plate 21 connected to the first sidewall 13. Of course, the specific arrangement of the drive assembly 2 can be determined by those skilled in the art according to the actual situation, and no specific limitation is made here.

[0043] like Figure 1 and Figure 4 As shown, in one example, at least a portion of the first sidewall 13 is recessed inward to form a groove 131, the bottom wall of which forms the vibrating plate 21.

[0044] In this example, a groove 131 can be formed on the outer side of the first sidewall 13 by stamping from the outside inward. The bottom wall of the groove 131 can serve as a vibrating plate 21, that is, the piezoelectric sheet 22 is bonded to the bottom wall of the groove 131, and the hollow part 211 is provided on the bottom wall of the groove 131.

[0045] like Figure 4 As shown, in this example, the bottom wall of the groove 131 is the vibrating plate 21, and the side wall of the groove 131 can serve as the elastic arm 132. The vibrating plate 21 is elastically connected to the first side wall 13 through the elastic arm 132, which is more conducive to the smooth vibration of the vibrating plate 21 and reduces the energy consumption of the piezoelectric micropump.

[0046] like Figure 4 As shown, in one example, the piezoelectric sheet 22 is located within the groove 131. That is, the piezoelectric sheet 22 is completely submerged within the groove 131, thereby providing a certain degree of protection for the piezoelectric sheet 22.

[0047] like Figure 2 and Figure 3 As shown, in one example, the housing 1 is provided with a plurality of inner cavities 11 at intervals, and each inner cavity 11 is provided with two driving components 2.

[0048] like Figure 2 and Figure 3 As shown, in this example, the housing 1 has two inner cavities 11 spaced apart by a partition 15. Each inner cavity 11 has a drive assembly 2 on each opposite side. That is, each inner cavity 11 and its corresponding two drive assemblies 2 form a pump structure.

[0049] like Figure 2 As shown, in this example, the housing 1 has two inner cavities 11 spaced apart, and the outlets 12 of the two inner cavities 11 can be located on the same side of the housing 1. Alternatively, the two outlets 12 can be located on different sides of the housing 1, which can be determined by those skilled in the art according to the actual situation, and no specific limitation is made here.

[0050] It should be noted that the housing 1 may also have more internal cavities 11 spaced apart, with each pair of adjacent internal cavities 11 separated by a partition 15. For example, the housing 1 may also have three, four, or five internal cavities 11 spaced apart, which may be determined by those skilled in the art according to the actual situation, and no specific limitation is made here.

[0051] like Figure 4As shown, in this example, there is a gap 3 between the piezoelectric sheet 22 and the sidewall of the groove 131. During the bending vibration of the piezoelectric sheet 22, the gap 3 can avoid the bending deformation of the piezoelectric sheet 22, thereby providing sufficient space for the bending vibration of the drive assembly.

[0052] Regarding the specific value of the gap, those skilled in the art can determine it according to the actual situation, as long as it can avoid bending deformation of the piezoelectric sheet, and no specific limitation is made here.

[0053] like Figure 2 As shown, in one example, the drive components 2 corresponding to two adjacent inner cavities 11 are staggered, which can save space in the housing 1 and is beneficial to the miniaturization design of the piezoelectric micropump.

[0054] In this example, such as Figure 2 As shown, the housing 1 has a prism structure, the first sidewall 13 has a rectangular structure, and multiple inner cavities 11 are arranged at intervals along the length of the first sidewall 13. Taking the center line extending along the length of the first sidewall 13 as the reference line, the centers of two adjacent drive components 2 are located on opposite sides of the reference line, so that the drive components 2 corresponding to two adjacent inner cavities 11 can be staggered. For example, the vibrating plate 21 has a circular structure, and along the arrangement direction of the inner cavities 11, the centers of two adjacent vibrating plates 21 are located on opposite sides of the reference line.

[0055] Alternatively, the second sidewall 14 located on the same side of the multiple cavities 11 can be used as a reference plane, with the length direction of the reference plane being the arrangement direction of the multiple cavities 11. One of the two adjacent drive components 2 is positioned relatively close to the reference plane, and the other is positioned relatively far from the reference plane, thereby enabling the drive components 2 corresponding to the two adjacent cavities 11 to be staggered.

[0056] Of course, the specific arrangement of the driving component 2 can be determined by those skilled in the art according to the actual situation, and no specific limitation is made here.

[0057] In one example, the centers of the drive components 2 corresponding to the multiple cavities 11 can also be located on the same straight line.

[0058] In one example, the inlet coincides with the outlet 12. The housing 1 is provided with an opening communicating with the inner cavity 11, which serves as both the outlet 12 and the inlet, thereby simplifying the manufacturing process of the housing 1. That is, the drive assembly 2 can bend outward from the inner cavity 11 to increase the volume of the inner cavity 11, so as to draw external fluid into the inner cavity 11 through the opening. Then, the drive assembly 2 can bend inward from the inner cavity 11 to decrease the volume of the inner cavity 11, so as to discharge the fluid in the inner cavity 11 from the opening.

[0059] In one example, the inlet and the opening can also be located on opposite sides of the inner cavity 11, that is, the housing 1 has openings on opposite sides of the inner cavity 11, one of which is an inlet and the other is an opening. For example, the two drive components 2 are located on the upper and lower sides of the inner cavity 11, respectively. The outlet 12 and the inlet are located on the front and rear sides of the inner cavity 11, respectively.

[0060] Of course, those skilled in the art can determine the specific settings for the opening and the inlet according to the actual situation, and no specific limitations are made here.

[0061] In one example, the two drive components 2 corresponding to the inner cavity 11 are coaxially arranged, which helps to improve the stability of the piezoelectric micropump output.

[0062] like Figure 1 As shown, in this example, both the vibrating plate 21 and the piezoelectric sheet 22 are circular structures. The two drive components 2, located on opposite sides of the inner cavity 11, are coaxially arranged. For example, the centers of the two vibrating plates 21 and the two piezoelectric sheets 22 are on the same straight line.

[0063] When there are multiple inner cavities 11, the two driving components 2 corresponding to each inner cavity 11 are coaxially arranged, or some of the driving components 2 are coaxially arranged. Those skilled in the art can determine this according to the actual situation, and no specific limitation is made here.

[0064] According to another embodiment of this application, a heat dissipation system is provided. This heat dissipation system includes the piezoelectric micropump described in the above embodiment. The piezoelectric micropump includes a housing 1 having an inner cavity 11, and an inlet and an outlet 12 communicating with the inner cavity 11; a drive assembly 2 installed in the inner cavity 11, the drive assembly 2 including a vibrating plate 21 and a piezoelectric sheet 22, the piezoelectric sheet 22 being adhered to the vibrating plate 21; the drive assembly 2 is deformable to achieve the intake and exhaust of fluid in the inner cavity 11; wherein, two drive assemblies 2 are provided, the two drive assemblies 2 being located on opposite sides of the inner cavity 11, and the two drive assemblies 2 being capable of synchronously deforming in opposite directions. By providing one drive assembly 2 on each opposite side of the inner cavity 11, and the two drive assemblies 2 being capable of synchronously deforming in opposite directions, the flow rate and velocity of the fluid in the inner cavity 11 can be increased, thereby improving the working efficiency of the piezoelectric micropump and thus improving the heat dissipation effect of the heat dissipation system.

[0065] In this example, the heat dissipation system can be installed on the electronic device, and the piezoelectric micropump can circulate air or coolant to dissipate heat from the electronic device. The electronic device can be a mobile phone, laptop computer, or other electronic product; those skilled in the art can determine the appropriate device based on the specific circumstances, and no specific limitation is made here.

[0066] Of course, the heat dissipation system of this application also includes at least all the beneficial effects of the above embodiments, which will not be elaborated here.

[0067] The above embodiments mainly describe the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be elaborated here.

[0068] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A piezoelectric micropump, characterized in that, include: A housing having an inner cavity, the housing having an inlet and an outlet communicating with the inner cavity; A drive assembly is installed in the inner cavity. The drive assembly includes a vibrating plate and a piezoelectric sheet. The piezoelectric sheet is bonded to the vibrating plate. The drive assembly is deformable to realize the intake and exhaust of fluid in the inner cavity. The drive assembly comprises two components, which are located on opposite sides of the inner cavity and are capable of synchronous reverse deformation.

2. The piezoelectric micropump according to claim 1, characterized in that, The housing includes two first sidewalls disposed opposite to each other, forming the cavity between the two first sidewalls, and the two drive components are respectively disposed on the two first sidewalls.

3. The piezoelectric micropump according to claim 2, characterized in that, The vibrating plate is integrally formed with the first sidewall.

4. The piezoelectric micropump according to claim 2, characterized in that, At least a portion of the first sidewall is recessed inward to form a groove, the bottom wall of which forms the vibrating plate.

5. The piezoelectric micropump according to claim 4, characterized in that, The piezoelectric element is located within the groove.

6. The piezoelectric micropump according to claim 5, characterized in that, There is a gap between the piezoelectric sheet and the sidewall of the groove.

7. The piezoelectric micropump according to claim 1, characterized in that, The housing is provided with a plurality of inner cavities at intervals, and each inner cavity is provided with two drive components.

8. The piezoelectric micropump according to claim 7, characterized in that, The drive components corresponding to two adjacent inner cavities are staggered; And / or, the two drive components corresponding to the inner cavity are coaxially arranged.

9. The piezoelectric micropump according to claim 1, characterized in that, The imports and exports overlap.

10. A heat dissipation system, characterized in that, Including the piezoelectric micropump as described in any one of claims 1 to 9.

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