Active bidirectional heat dissipation piezoelectric fan

Abstract

The invention relates to the technical field of heat dissipation devices, in particular to an active two-way heat dissipation piezoelectric fan which comprises a supporting structure, a heat dissipation structure and a heat dissipation structure. The cooling element is of a sheet-shaped structure and is fixed in the cavity, the cooling element is provided with a cantilever capable of relatively vibrating in the thickness direction of the cooling element, and the cantilever drives fluid from one side to the other side in the thickness direction of the cantilever during vibration; a first through hole and a second through hole which are communicated with the cavity are respectively formed in two sides of the supporting structure in the vibration direction of the cantilever; the valve plate is arranged at the first through hole and / or the second through hole and used for controlling opening and closing of the first through hole or the second through hole; and the cooling element is matched with the valve plate, so that fluid enters the cavity from the first through hole and is discharged from the second through hole or flows reversely. Through the structural arrangement, adjustment of two-way air flow is achieved, and therefore the heat dissipation flexibility is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat dissipation devices, and in particular to an active bidirectional heat dissipation piezoelectric fan. Background Art

[0002] Heat dissipation devices can be divided into passive heat dissipation and active heat dissipation. Passive heat dissipation refers to the dissipation of heat through heat-conducting materials such as copper and aluminum, while active heat sinks refer to the removal of heat by actively driving the flow of heat dissipation media. In comparison, active heat dissipation has better effects, but it often has limitations such as high cost and large size.

[0003] In the prior art, in order to solve the problem of large space occupation of existing active radiators, piezoelectric sheets have begun to be used to replace traditional motors. For example, a Chinese invention patent application with publication number CN112303298A disclosed a one-way valve and a micro air pump with a one-way valve on February 2, 2021, which drives the reciprocating vibration of the one-way valve through the vibration of the piezoelectric sheet, thereby realizing the flow of air in a single direction; However, the above heat dissipation device can only realize one-way airflow and cannot adjust the flow direction according to demand, thereby limiting the flexibility and efficiency of heat dissipation. Summary of the invention

[0004] In view of at least one of the above technical problems, the present invention provides an active bidirectional heat dissipation piezoelectric fan, which adopts structural improvement to improve the flexibility of heat dissipation.

[0005] According to a first aspect of the present invention, there is provided an active bidirectional heat dissipation piezoelectric fan, comprising: A support structure having a chamber therein; A cooling element, in a sheet-like structure, fixed in the chamber, the cooling element having a cantilever that can vibrate relatively in the thickness direction thereof, the cantilever driving the fluid from one side to the other side in the thickness direction thereof when vibrating, the supporting structure having a first through hole and a second through hole communicating with the chamber on both sides in the vibration direction of the cantilever respectively; A valve plate, disposed at the first through hole and / or the second through hole, and used to control the opening and closing of the first through hole or the second through hole; The cooling element cooperates with the valve plate to enable the fluid to enter the chamber from the first through hole and be discharged from the second through hole or flow in the reverse direction.

[0006] In some embodiments of the present invention, the supporting structure includes a bottom plate and a top plate, the bottom plate and the top plate are arranged in parallel, the chamber is formed therebetween, the first through hole is arranged on the top plate, and the second through hole is arranged on the bottom plate.

[0007] In some embodiments of the present invention, the first through hole penetrates the top plate in the thickness direction, and the second through hole is disposed on the side wall of the bottom plate and communicates with the chamber.

[0008] In some embodiments of the present invention, the first through hole penetrates the top plate in the thickness direction, and the second through hole penetrates the bottom plate in the thickness direction.

[0009] In some embodiments of the present invention, the bottom plate further has a ventilation groove on a surface facing the chamber, and the ventilation groove is connected to the second through hole.

[0010] In some embodiments of the present invention, the support structure further comprises a fan plate, the cooling element is formed on the fan plate, and a plurality of the cooling elements are arranged on the fan plate.

[0011] In some embodiments of the present invention, the cooling elements are arranged in two opposite rows on the fan plate, and the cantilevers of two cooling elements in the same row are arranged opposite to each other.

[0012] In some embodiments of the present invention, the supporting structure also includes a splint, which is parallelly attached to the side of the fan plate facing away from the base plate, and both sides of the splint in the thickness direction have inwardly recessed grooves, and a plate hole is provided in the middle of the two grooves.

[0013] In some embodiments of the present invention, the support structure further includes a valve plate, the valve plate is clamped between the clamping plate and the top plate, the valve sheets are formed on the valve plate, and the number of the valve sheets corresponds to the first through holes.

[0014] In some embodiments of the present invention, both the cooling element and the valve plate are provided with a piezoelectric ceramic plate, and the piezoelectric ceramic plate is used to control the vibration direction of the cooling element or control the opening and closing of the valve plate.

[0015] The beneficial effects of the present invention are as follows: through the cooperation of the cooling element and the valve plate in the chamber of the supporting structure, when the opening and closing direction of the valve plate is the same as the vibration direction of the cooling element, the airflow flows in one direction, and when the opening and closing direction of the valve plate is opposite to the vibration direction of the cooling element, the airflow vibrates in the other direction, and when the valve plate is closed, the airflow also stops flowing. Through the above-mentioned structural setting, the regulation of two-way air flow is realized, thereby improving the flexibility of heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of an active bidirectional heat dissipation piezoelectric fan in an embodiment of the present invention; Figure 2 In the embodiment of the present invention Figure 1 AA section view in the figure; Figure 3 It is a schematic diagram of the structure when the second through hole is arranged at the bottom in an embodiment of the present invention; Figure 4 It is a schematic diagram of the exploded structure of an active bidirectional heat dissipation piezoelectric fan in an embodiment of the present invention; Figure 5 Schematic diagram of the structure of the fan plate in an embodiment of the present invention; Figure 6 It is a schematic diagram of the structure of a splint in an embodiment of the present invention; Figure 7 It is a schematic diagram of the explosion decomposition structure of the valve plate and the top plate in an embodiment of the present invention.

[0018] Description of reference numerals: 1. Support structure; 11. Chamber; 11a. First through hole; 11b. Second through hole; 111. Bottom plate; 111a. Ventilation slot; 112. Top plate; 113. Fan plate; 114. Clamp; 114a. Groove; 114b. Orifice plate; 115. Valve plate; 2. Cooling element; 21. Cantilever; 211. Piezoelectric ceramic sheet; 3. Valve sheet. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0022] like Figures 1 to 7 The active bidirectional heat dissipation piezoelectric fan shown in the figure comprises a support structure 1, a cooling element 2 and a valve plate 3, as shown in FIG. Figure 1 and Figure 2 As shown in, in an embodiment of the present invention, the support structure 1 has a chamber 11 inside; the cooling element 2 is a sheet-like structure, fixed in the chamber 11, and the cooling element 2 has a cantilever 21 that can vibrate relatively in its thickness direction, and the cantilever 21 drives the fluid from one side in its thickness direction to the other side when vibrating, and the support structure 1 has a first through hole 11a and a second through hole 11b connected to the chamber 11 on both sides in the vibration direction of the cantilever 21 respectively; a valve plate 3 is arranged at the first through hole 11a and / or the second through hole 11b, and is used to control the opening and closing of the first through hole 11a or the second through hole 11b; in an embodiment of the present invention, the valve plate 3 is arranged at the first through hole 11a, or can also be arranged at the second through hole 11b, or the valve plate 3 is arranged at both the first through hole 11a and the second through hole 11b; in an embodiment of the present invention, the cooling element 2 cooperates with the valve plate 3 to realize that the fluid enters the chamber 11 from the first through hole 11a and is discharged from the second through hole 11b or flows in the opposite direction.

[0023] When performing specific control, please refer to Figure 2 In one embodiment of the present invention, the valve plate 3 is only provided at the first through hole 11a. When the vibration directions of the cooling element 2 and the valve plate 3 are the same, that is, Figure 2 As shown in , when the cantilever 21 of the cooling element 2 moves downward, the valve plate 3 opens, and when the cantilever 21 of the cooling element 2 moves upward, the valve plate 3 closes. Through this form of vibration, the airflow is sucked into the chamber 11 from the first through hole 11a, and then discharged through the second through hole 11b, so that the airflow moves in one direction; when the vibration direction of the cooling element 2 is opposite to the opening and closing direction of the valve plate 3, that is, when the valve plate 3 at the first through hole 11a opens downward, the cantilever 21 of the cooling element 2 moves upward, so that the airflow is discharged toward the first through hole 11a, and this is repeated, so that the airflow is sucked into the chamber 11 from the second through hole 11b, and then discharged from the first through hole 11a. When it is necessary to stop blowing, just close the valve plate 3.

[0024] In the above embodiment, through the cooperation between the cooling element 2 and the valve plate 3 in the chamber 11 of the supporting structure 1, when the opening and closing direction of the valve plate 3 is the same as the vibration direction of the cooling element 2, the airflow flows in one direction, and when the opening and closing direction of the valve plate 3 is opposite to the vibration direction of the cooling element 2, the airflow vibrates in the other direction, and when the valve plate 3 is closed, the airflow also stops flowing. Through the above structural setting, the regulation of two-way air flow is realized, thereby improving the flexibility of heat dissipation.

[0025] Optionally, in order to reduce the thickness of the product, the support structure 1 includes a bottom plate 111 and a top plate 112, the bottom plate 111 and the top plate 112 are arranged in parallel, the chamber 11 is formed between the bottom plate 111 and the top plate 112, the first through hole 11a is arranged on the top plate 112, and the second through hole 11b is arranged on the bottom plate 111. In addition, in the embodiment of the present invention, the air can be inhaled and discharged from the side or from the bottom, as shown in the following example. Figure 2 As shown in , in some embodiments of the present invention, the first through hole 11a penetrates the top plate 112 in the thickness direction, and the second through hole 11b is arranged on the side wall of the bottom plate 111 and communicates with the chamber 11. By arranging the air outlet from the side, the bottom plate 111 can be in contact with the heat source with the largest area, and then the heat generated by the heat source can be discharged from the side or the top.

[0026] In addition, in another embodiment of the present invention, Figure 3 As shown in , the first through hole 11a penetrates the top plate 112 in the thickness direction, and the second through hole 11b penetrates the bottom plate 111 in the thickness direction. This form of up-and-down airflow can blow air toward the heat source or absorb heat from the heat source. The air path is more efficient, so that heat can be taken away more quickly or the temperature can be reduced by cold air.

[0027] In the embodiment of the present invention, in order to further reduce the overall thickness, as Figure 5 and Figure 7 As shown in FIG. 1 , the cooling element 2 and the valve plate 3 are both provided with a piezoelectric ceramic plate 211, and the piezoelectric ceramic plate 211 is used to control the vibration direction of the cooling element 2 or control the opening and closing of the valve plate 3, as shown in FIG. Figure 4 As shown in the figure, the bottom plate 111 has a ventilation groove 111a on one side facing the chamber 11, and the ventilation groove 111a is connected to the second through hole 11b. The piezoelectric ceramic sheet 211 can provide power for the vibration of the cooling element 2 and the valve sheet 3, and the piezoelectric ceramic sheet 211 has lower energy consumption and higher frequency than a traditional fan, and in the ultrasonic frequency band, it not only ensures a higher response speed, but also effectively eliminates noise pollution.

[0028] Specific as Figure 5As shown in , in an embodiment of the present invention, the support structure 1 further includes a fin plate 113, and the cooling element 2 is formed on the fin plate 113, and a plurality of cooling elements 2 are arranged on the fin plate 113. In an embodiment of the present invention, multiple cooling elements 2 can be formed by directly punching holes in the metal plate, and the cooling elements 2 are arranged in two rows on the fin plate 113, and the cantilevers 21 of the two cooling elements 2 in the same row are arranged opposite to each other. Figure 5 As shown in the figure, six cooling elements 2 are formed by four vertically parallel strip holes arranged at intervals and a horizontal strip hole in the middle. The specific material selection and the number of cooling elements 2 can be set according to actual needs.

[0029] In an embodiment of the present invention, Figure 6 As shown in , the support structure 1 also includes a clamping plate 114, which is parallel to the side of the fan plate 113 away from the bottom plate 111. Both sides of the clamping plate 114 in the thickness direction have grooves 114a that are recessed inward, and there is a plate hole in the middle of the two grooves 114a. The arrangement of the grooves 114a on both sides not only provides space for the vibration of the cooling element 2 and the valve plate 3, but also further reduces the overall thickness. In addition, in the embodiment of the present invention, the piezoelectric ceramic sheet 211 can be fixed on the side facing the clamping plate 114; in the embodiment of the present invention, the holes on the orifice plate 114b can be the same as the number and position of the first through holes 11a on the top plate 112, so as to improve the stability of the gas path.

[0030] In an embodiment of the present invention, Figure 7 As shown in , the support structure 1 further includes a valve plate 115, which is sandwiched between the clamping plate 114 and the top plate 112. The valve sheets 3 are formed on the valve plate 115, and the number of the valve sheets 3 corresponds to the first through holes 11a. It should be noted that the surface of the valve sheet 3 facing the top plate 112 is in contact with the top plate 112 in the closed state, so that the first through holes 11a can be blocked.

[0031] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An active bidirectional heat dissipation piezoelectric fan, characterized in that: include: A support structure having a chamber therein; A cooling element, in a sheet-like structure, fixed in the chamber, the cooling element having a cantilever that can vibrate relatively in the thickness direction thereof, the cantilever driving the fluid from one side to the other side in the thickness direction thereof when vibrating, the supporting structure having a first through hole and a second through hole communicating with the chamber on both sides in the vibration direction of the cantilever respectively; A valve plate, disposed at the first through hole and / or the second through hole, and used to control the opening and closing of the first through hole or the second through hole; The cooling element cooperates with the valve plate to enable the fluid to enter the chamber from the first through hole and be discharged from the second through hole or flow in the reverse direction.

2. The active bidirectional heat dissipation piezoelectric fan according to claim 1, characterized in that: The supporting structure includes a bottom plate and a top plate, the bottom plate and the top plate are arranged in parallel, the chamber is formed between the bottom plate and the top plate, the first through hole is arranged on the top plate, and the second through hole is arranged on the bottom plate.

3. The active bidirectional heat dissipation piezoelectric fan according to claim 2, characterized in that: The first through hole penetrates the top plate in a thickness direction, and the second through hole is disposed on a side wall of the bottom plate and communicates with the chamber.

4. The active bidirectional heat dissipation piezoelectric fan according to claim 2, characterized in that: The first through hole penetrates the top plate in the thickness direction, and the second through hole penetrates the bottom plate in the thickness direction.

5. The active bidirectional heat dissipation piezoelectric fan according to claim 2, characterized in that: The bottom plate further has a ventilation groove on one side facing the chamber, and the ventilation groove is communicated with the second through hole.

6. The active bidirectional heat dissipation piezoelectric fan according to claim 5, characterized in that: The support structure further comprises a fin plate, the cooling element is formed on the fin plate, and a plurality of cooling elements are arranged on the fin plate.

7. The active bidirectional heat dissipation piezoelectric fan according to claim 6, characterized in that: The cooling elements are arranged in two rows opposite to each other on the fan plate, and the cantilevers of the two cooling elements in the same row are arranged opposite to each other.

8. The active bidirectional heat dissipation piezoelectric fan according to claim 6, characterized in that: The supporting structure also includes a clamping plate, which is parallelly attached to the side of the fan plate away from the bottom plate. Both sides of the clamping plate in the thickness direction have grooves that are recessed inwards, and a plate hole is provided in the middle of the two grooves.

9. The active bidirectional heat dissipation piezoelectric fan according to claim 8, characterized in that: The supporting structure further includes a valve plate, which is sandwiched between the clamping plate and the top plate. The valve sheets are formed on the valve plate, and the number of the valve sheets corresponds to the first through holes.

10. The active bidirectional heat dissipation piezoelectric fan according to claim 8, characterized in that: The cooling element and the valve plate are both provided with a piezoelectric ceramic plate, and the piezoelectric ceramic plate is used to control the vibration direction of the cooling element or control the opening and closing of the valve plate.

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