Heat dissipation device based on reflective surface

Abstract

The present invention relates to the technical field of heat dissipation devices, and in particular to a heat dissipation device based on a reflective surface, comprising a heat dissipation component and at least one reflective plate; the heat dissipation component has a diaphragm, a spacer and a piezoelectrically driven actuator, an excitation cavity is formed between the actuator, the spacer and the diaphragm, at least one hole portion connected to the excitation cavity passes through the area of ​​the diaphragm opposite to the excitation cavity, a reflective plate is provided on the side of the diaphragm away from the actuator, so that a guide cavity is formed between the reflective plate and the diaphragm, and a reflective surface arranged opposite to the hole portion is provided on the side of the reflective plate close to the hole portion. The present invention arranges the reflective surface so that the airflow ejected from the hole portion is deflected after contacting the reflective surface and ejected in a first direction on the outer peripheral side of the guide cavity, and the heat source is laterally arranged in the jet direction of the heat dissipation device, thereby realizing lateral outflow and directional heat dissipation, which meets the development demand of thin terminal products.

Description

Technical Field

[0001] The present invention relates to the technical field of heat dissipation devices, and in particular to a heat dissipation device based on a reflective surface. Background Art

[0002] In recent years, gas generating devices using piezoelectric transducers as actuators, such as a piezoelectric pump declared with publication number CN101490419B, a fluid pump declared with publication number CN102597520B, and a piezoelectric micro blower declared with publication number CN101542122B, are installed in the internal space of terminal products and are believed to generate greater heat benefits.

[0003] However, on the one hand, the energy transfer and utilization efficiency of the above-mentioned gas generating device is low, and it is difficult to output a larger flow rate; on the other hand, the above-mentioned gas generating device uses gas as a heat exchange and heat dissipation medium, and the heat source is usually arranged directly opposite the gas outlet of the gas generating device, so that the airflow ejected from the gas generating device directly impacts the surface of the heat source, thereby improving the heat exchange and heat dissipation efficiency.

[0004] However, since the gas outlets in the above-mentioned gas generating device are all located on the side in the thickness direction, they must be stacked with the heat source in the thickness direction during use, which increases the overall thickness, is not conducive to the thinning of the terminal product and limits its application. Summary of the invention

[0005] The technical problem to be solved by the present invention is: in order to solve the deficiencies of the prior art, a heat dissipation device is provided, which has a larger flow output and also has the function of lateral jetting.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a heat dissipation device based on a reflective surface, comprising a heat dissipation component and at least one reflective plate;

[0007] The heat dissipation component comprises a diaphragm, a spacer and a piezoelectrically driven actuator, wherein the actuator comprises a first main surface and a second main surface which are arranged opposite to each other in the thickness direction, the first main surface or / and the second main surface are joined with the spacer, the spacer is joined with the actuator at one end close to the actuator, the diaphragm is fixedly connected to the end of the spacer which is away from the actuator, so that an excitation cavity is formed between the actuator, the spacer and the diaphragm, and at least one hole portion which is connected to the excitation cavity is penetrated through the area of ​​the diaphragm which is opposite to the excitation cavity;

[0008] The actuator is used to cause the diaphragm to vibrate, and the hole portion is arranged at the antinode position of the diaphragm vibration or in the vicinity of the antinode position;

[0009] The reflecting plate is arranged at a distance from the actuator on the side of the diaphragm, so that a guide cavity is formed between the reflecting plate and the diaphragm, and a reflecting surface is arranged opposite to the hole on the side of the reflecting plate close to the hole, and the orthographic projection of the reflecting surface on the diaphragm covers the hole, and the axis of the hole is arranged at an angle α to the reflecting surface, so that the gas jet ejected from the hole is deflected after hitting the reflecting surface and ejected toward the outer peripheral side of the guide cavity, and the angle α is an acute angle.

[0010] Furthermore, a reflecting portion protruding from the reflecting plate is formed in a region of the reflecting plate opposite to the hole portion, and a surface of one side of the reflecting portion close to the hole portion is formed as a reflecting surface.

[0011] Configuration scheme 1 of the reflective surface: there is one reflective surface, and the projection of the one reflective surface on the diaphragm covers all the holes.

[0012] A second configuration scheme for the reflective surface is that there are multiple reflective surfaces, and the orthographic projections of the multiple reflective surfaces on the diaphragm respectively cover at least one of the hole portions.

[0013] Furthermore, the airflows touched by the multiple reflecting surfaces are ejected in the same direction after being deflected, and are all ejected in a first direction toward the outer peripheral side of the guide cavity.

[0014] Further, among the plurality of the reflecting surfaces, the reflecting surface on the upstream side in the first direction is an upstream reflecting surface, and the reflecting surface on the downstream side in the first direction is a downstream reflecting surface, and in a projection plane perpendicular to the first direction, the orthographic projection of the upstream reflecting surface and the orthographic projection of the downstream reflecting surface at least partially overlap;

[0015] The airflow touched by the downstream reflection surface is deflected and ejected toward a first direction on the outer peripheral side of the flow guide cavity;

[0016] The upstream reflection surface is offset, so that the airflow touched by it is deflected and ejected toward the approximately first direction of the outer peripheral side of the flow guide cavity, and the angle β between the first direction and the approximately first direction is 30°-45°.

[0017] Furthermore, the reflector is further formed with a baffle portion protruding from the reflector, and the baffle portion is used to deflect the gas jet ejected from the upstream reflective surface toward the first direction after hitting the baffle portion.

[0018] Furthermore, there are two baffle parts, a directional flow channel extending along the first direction is formed between the two baffle parts, and all the reflecting surfaces are arranged in the directional flow channel.

[0019] Furthermore, the reflecting part is integrally formed with or fixedly connected to the reflecting plate.

[0020] Furthermore, when the actuator vibrates under the excitation of an electrical signal, it transfers vibration energy to the diaphragm to cause the diaphragm to generate vibrations in a high-order resonance mode with at least two antinodes, and at least one of the hole portions is respectively formed at at least two antinode positions of the diaphragm vibration or in the vicinity of the antinode positions.

[0021] Furthermore, the actuator generates vibration under external excitation and transmits vibration energy to the diaphragm, thereby causing the diaphragm to generate vibration in a high-order resonance mode. At least one hole portion is formed at each antinode position or the adjacent area of ​​the antinode position of the diaphragm vibration that encloses the excitation cavity.

[0022] Furthermore, the high-order resonance mode ranges from the second-order resonance mode to the ninth-order resonance mode.

[0023] Furthermore, the angle α is 30° to 70°.

[0024] Furthermore, the diaphragm is made of a polymer material, or a composite material of a polymer material and a metal material.

[0025] Further, the actuator comprises a substrate and a piezoelectric sheet, wherein at least one piezoelectric sheet is bonded to one or both sides of the substrate in the thickness direction, the piezoelectric sheet is bonded to the substrate to form an actuator, and the piezoelectric sheet causes the actuator to vibrate under the excitation of an electrical signal;

[0026] The spacer and the actuator form a groove with an opening at one end away from the actuator; the diaphragm is fixedly connected to the end of the spacer away from the actuator and covers the opening of the groove, so that an excitation cavity is formed between the actuator, the groove and the diaphragm.

[0027] The first installation scheme of the actuator also includes a shell plate and an elastic connecting part, wherein the shell plate surrounds the actuator, one end of the connecting part is connected to the shell plate, and the other end is connected to the actuator, and the outer periphery of the surface of the side of the reflector opposite to the diaphragm is fixed to the shell plate.

[0028] Furthermore, the shell plate surrounds the actuator via a gap, and the connecting portion is located in the gap.

[0029] Furthermore, a partition plate is provided between the diaphragm and the reflective plate, the partition plate is fixedly connected to the shell plate, and a flow hole is provided on the partition plate directly facing the hole portion.

[0030] A second installation scheme of the actuator, wherein the surface of the actuator facing the reflector has at least one connecting boss protruding from the side thereof and located outside the spacer;

[0031] The area of ​​the reflecting plate opposite to the connecting boss has a notch, an elastic supporting portion is formed in the notch, and the connecting boss is fixedly connected to the elastic supporting portion opposite thereto; or, the connecting boss is elastic, and is fixedly connected to a side of the reflecting plate close to the actuator.

[0032] Furthermore, a partition plate is provided between the diaphragm and the reflective plate, the partition plate is fixedly connected to the connecting boss, and a flow hole is provided on the partition plate directly facing the hole portion.

[0033] The third installation scheme of the actuator further includes an outer ring and a support portion, wherein the outer ring surrounds the actuator and has a height protruding from the actuator in a thickness direction of the actuator;

[0034] The supporting portion includes a cantilever portion and a holding portion, wherein the holding portion is engaged at a node position of vibration of the actuator, and the holding portion is arranged on a first main surface of the actuator, one end of the cantilever portion is fixedly connected to a surface of the holding portion facing away from the actuator, and the other end is engaged with a side of the outer ring facing away from the reflecting plate, and the side of the outer ring facing the reflecting plate is fixedly connected to the reflecting plate.

[0035] Furthermore, a partition plate is provided between the diaphragm and the reflective plate, the partition plate is fixedly connected to the outer ring, and a flow hole is provided on the partition plate directly facing the hole portion.

[0036] The beneficial effects of the present invention are:

[0037] 1) The heat dissipation device of the present invention is provided with a reflecting surface, and the axis of the hole is arranged at an angle α with the reflecting surface, so that the airflow ejected from the hole is deflected after hitting the reflecting surface and is ejected in a first direction toward the outer peripheral side of the guide cavity. The heat source is laterally arranged in the jet direction of the heat dissipation device, thereby realizing lateral outflow and directional heat dissipation, changing the way the gas generating device and the heat source are stacked along the thickness direction in the prior art, meeting the development demand of thin terminal products, and having a wider application prospect.

[0038] 2) The diaphragm of the present invention is fixedly connected to the actuator through a spacer. When the actuator vibrates, it drives the fluid in the chamber to produce pressure changes, thereby causing the diaphragm to vibrate and transfer energy to the diaphragm. More importantly, the energy is directly transferred to the diaphragm by forming a mechanical coupling between the actuator and the diaphragm, which has a higher energy transfer efficiency.

[0039] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0041] Figure 1 is a schematic diagram showing that the axis of the hole portion is arranged at an angle α to the reflecting surface;

[0042] Figure 2 is a cross-sectional schematic diagram of a heat dissipation device based on a reflective surface for dissipating heat from a heat source disposed around the heat dissipation device;

[0043] Figure 3 An exploded schematic diagram of a heat sink based on a reflective surface for dissipating heat from a heat source disposed around the heat sink;

[0044] Figure 4 is a schematic diagram of a heat dissipation device using a single reflecting surface;

[0045] Figure 5 is a schematic diagram of a heat dissipation device using a plurality of discretely arranged reflective surfaces;

[0046] Figure 6 is a schematic diagram of the heat dissipation device after a portion of the reflective surface is adjusted;

[0047] Figure 7 is a schematic diagram of a heat dissipation device configured with a baffle portion;

[0048] Figure 8 is a schematic diagram of the reflective portion and the reflective plate being integrally formed;

[0049] Fig. 9 is a schematic diagram of a structure in which a spacing portion is a plurality of spacing bodies arranged at intervals;

[0050] Fig.10 is a schematic diagram of forming an excitation cavity on one side of the actuator;

[0051] Fig.11 is a schematic cross-sectional view of a heat dissipation device based on a reflective surface with a shell plate support method;

[0052] Fig.12 It is a top view schematic diagram of the outer circle;

[0053] Fig.13 is a cross-sectional schematic diagram of a heat sink having a shell plate surrounding an actuator with a gap therebetween;

[0054] Fig.14 is a top view of the shell plate;

[0055] Fig.15 is a cross-sectional schematic diagram of a heat sink configured with a connecting boss;

[0056] Fig.16 is a cross-sectional schematic diagram of a heat sink in which the outer ring is connected to the actuator through a support portion;

[0057] Fig.17 It is a schematic diagram of the structure of the groove formed by the spacer plate and the base plate;

[0058] Fig.18 It is a schematic structural diagram of a spacer and a piezoelectric sheet disposed on the same side surface of a substrate in a thickness direction;

[0059] Fig.19 It is a schematic diagram of a structure in which both main surfaces of the actuator are provided with a spacer portion combined with a substrate, and a piezoelectric sheet is provided on any side surface of the substrate in the thickness direction;

[0060] Fig. 20 It is a structural schematic diagram in which piezoelectric sheets and spacers are disposed on both main surfaces of the actuator, and the spacers are bonded to the piezoelectric sheets;

[0061] Fig.21 The schematic diagram is a structural diagram in which spacers are provided on both main surfaces of the actuator, and the spacers on one side are bonded to the piezoelectric sheet, and the spacers on the other side are bonded to the substrate;

[0062] Fig. 22 It is a schematic diagram of the holes sucking fluid relatively independently during the working process;

[0063] Fig.23 It is a schematic diagram showing that the holes discharge fluid relatively independently during operation;

[0064] Fig.24 is a schematic diagram of a gas generator;

[0065] Fig.25 It is an exploded schematic diagram of a fluid generating device when the diaphragm is in a third-order resonance mode;

[0066] Fig.26 It is a schematic diagram of the structure in which the diaphragm is convexly deformed in one direction in the second-order subresonance mode;

[0067] Fig. 27 It is a schematic diagram of the structure in which the diaphragm is convexly deformed in another direction in the second-order sub-resonance mode;

[0068] Fig.28 It is a schematic diagram of the structure in which the diaphragm is convexly deformed in one direction in the fourth-order resonance mode;

[0069] Fig.29 It is a schematic diagram of the structure in which the diaphragm is convexly deformed in another direction in the fourth-order resonance mode;

[0070] Fig.30 It is a schematic diagram of the structure of the square diaphragm convexly deforming in one direction under the second-order subresonance mode when both sides of the short sides are fixed;

[0071] Fig.31 It is a schematic diagram of the structure of the square diaphragm convexly deforming in another direction under the second-order subresonance mode when both sides of the short sides are fixed;

[0072] Fig.32 It is a schematic diagram of a structure in which a square diaphragm is convexly deformed in one direction under a second-order subresonance mode when both short sides and long sides of the diaphragm are fixed;

[0073] Fig.33 It is a schematic diagram of the structure of the square diaphragm convexly deforming in another direction under the second-order subresonance mode when both the short sides and the long sides are fixed;

[0074] Fig.34 It is a schematic diagram of a structure in which a square diaphragm is convexly deformed in one direction under a higher-order resonance mode when both short sides and long sides of the diaphragm are fixed;

[0075] Fig.35 is a schematic diagram of a heat dissipation device in which a partition plate is arranged inside a shell plate;

[0076] Fig.36 is a schematic diagram of a heat sink having a partition plate fixedly connected to a connecting boss;

[0077] Fig.37 is a schematic diagram of a heat dissipation device having a partition plate disposed within an outer ring;

[0078] Fig.38 It is a schematic diagram of a gas generating device in the prior art.

[0079] In the figure: 1, diaphragm, 11, hole portion, 1-1, antinode position, 1-1a, central antinode, 1-1b, annular antinode;

[0080] 2. a spacer portion, 21. a groove portion, 22. a spacer body;

[0081] 3. Reflection plate; 31. Reflection portion; 311. Reflection surface; 311a. Upstream reflection surface; 311b. Downstream reflection surface; 32. Baffle portion; 33. Notch; 34. Elastic support portion;

[0082] 4. actuator, 4a. first main surface, 4b. second main surface, 41. substrate, 42. piezoelectric sheet, 421. cavity, 43. connecting boss;

[0083] 5. Excitation chamber;

[0084] 6. flow guide cavity; 61. partition plate; 61-1. flow hole; 62. flow through hole;

[0085] 7. Directional flow channel;

[0086] 8, shell plate, 81, connection part, 82, gap;

[0087] 9, outer ring, 91, supporting portion, 911, cantilever portion, 912, retaining portion;

[0088] 10. chamber; 10-1. flexible plate; 10-2. drainage hole;

[0089] F. First direction;

[0090] F1, approximate first direction. DETAILED DESCRIPTION

[0091] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention, and directions and references (e.g., up, down, left, right, etc.) may only be used to help describe the features in the drawings. Therefore, the following specific embodiments are not to be taken in a limiting sense, and the scope of the subject matter claimed is limited only by the attached claims and their equivalents.

[0092] The gas generating devices in the prior art, such as a piezoelectric pump declared in Patent No. CN101490419B, a fluid pump declared in Patent No. CN102597520B, and a piezoelectric micro blower declared in Patent No. CN101542122B, are known to be the same or similar in the principle of gas generation, and their composition structures at least include a piezoelectric driven actuator 4, a deformable flexible plate 10-1 (or called a resonance plate, resonance sheet, flexible plate, thin-walled portion, etc.) at a central position and nearby positions that are arranged relative to the actuator 4 with a gap, and a drainage hole 10-2 for gas to pass through is also arranged on the flexible plate 10-1 relative to the central area of ​​the actuator 4, such as Fig.38 As shown, the actuator 4 vibrates under external excitation. Along with the vibration of the actuator 4, the gas pressure in the chamber 10 formed by the gap between the actuator 4 and the flexible plate 10-1 changes, thereby causing the flexible plate 10-1 centered on the drainage hole 10-2 to vibrate. As a result, the volume of the chamber 10 formed by the actuator 4 and the gap between the flexible plate 10-1 periodically expands or contracts, and the gas enters the chamber 10 through the drainage hole 10-2. The pressurized gas formed after being squeezed flows toward the periphery of the actuator 4, or the gas enters the chamber 10 from the periphery of the actuator 4, and the pressurized gas formed after being squeezed is ejected from the chamber 10 through the drainage hole 10-2.

[0093] In the above structure, the vibration energy of the actuator 4 is transmitted to the flexible plate 10-1 through the change of gas pressure in the chamber 10, thereby forcing the flexible plate 10-1 to resonate. Due to the existence of pneumatic damping, there is a large loss in the vibration energy transmitted through fluid-solid coupling, and the energy transfer efficiency is not high. At the same time, the effective working space of the above resonance system is mainly concentrated in the area of ​​the chamber 10 opposite to the central large amplitude of the piezoelectric actuator 4 and the flexible plate 10-1, while the vibration energy of the area outside the central large amplitude area of ​​the piezoelectric actuator 4 and the flexible plate 10-1 is not effectively utilized, resulting in low overall energy utilization. The volume change of the gap 82 under this structure is limited, and the flow output performance is poor. When used as a heat dissipation device, it cannot meet the use requirements.

[0094] Based on this, the inventor of the present application has studied a gas generator having the structure shown below;

[0095] Fig.24 2 is a cross-sectional view of a gas generator, the gas generator includes a piezoelectric actuator 4, a spacer 2 and a diaphragm 1, the piezoelectric actuator 4 includes a substrate 41 and at least one piezoelectric sheet 42 bonded to one side or both sides of the substrate 41, the piezoelectric sheet 42 causes the actuator 4 to vibrate under the stimulation of an electrical signal, a spacer 2 is provided on one side or both sides of the actuator 4, and the spacer 2 and the actuator 4 form a groove 21 with an opening at one end away from the actuator 4; the diaphragm 1 is connected to the end of the spacer 2 away from the actuator 4 , and seal the opening of the groove 21 to form an excitation cavity 5 between the actuator 4, the groove 21 and the diaphragm 1. A hole 11 connected to the excitation cavity 5 passes through the area of ​​the diaphragm 1 opposite to the excitation cavity 5. When the actuator 4 vibrates under the excitation of an electrical signal, the vibration energy is transferred to the diaphragm 1 to cause the diaphragm 1 to generate a high-order resonance mode vibration with at least two antinodes. At least one hole 11 is respectively formed at at least two antinode positions 1-1 of the vibration of the diaphragm 1 or in the vicinity of the antinode position 1-1.

[0096] Thus, the diaphragm 1 is fixedly connected to the actuator 4 through the spacer 2, and the vibration of the actuator 4 causes the diaphragm 1 to vibrate, and this process is accompanied by the transfer of energy. The vibration energy generated by the actuator 4 under the stimulation of the external electrical signal, on the one hand, is transferred to the diaphragm 1 by driving the fluid in the chamber 10 to produce pressure changes when the actuator 4 vibrates, thereby causing the diaphragm 1 to vibrate. On the other hand, the energy is directly transferred to the diaphragm 1 through the mechanical coupling formed by the actuator 4 and the diaphragm 1. Compared with the prior art that only relies on the fluid to transfer vibration energy, the energy transfer efficiency is higher. In addition, the diaphragm 1 generates vibrations of a high-order resonant mode, and at least two wave-node positions 1-1 or the adjacent areas of the wave-node positions 1-1 are respectively formed with at least one hole portion 11. At this time, the effective working space of the chamber 10 between the actuator 4 and the diaphragm 1 is no longer mainly concentrated in the central area of ​​the diaphragm 1, but extends to a larger area than the central area, and the utilization rate of the vibration energy is higher.

[0097] However, although the gas generator can achieve a larger flow output compared to the existing technology, when the gas generator is used as a heat exchange and heat dissipation device, since the gas outlet is still located on the side in the thickness direction, it must be stacked with the heat source in the thickness direction during use, resulting in an increase in the overall thickness. Even if the output flow of the gas generating device is increased, it is difficult to meet the stringent thinning requirements of smart terminals.

[0098] In view of this, this application continues to design the following solutions:

[0099] Example 1

[0100] A heat dissipation device based on a reflective surface, comprising a heat dissipation component and at least one reflective plate 3;

[0101] The heat dissipation component comprises a diaphragm 1, a spacer 2 and a piezoelectrically driven actuator 4, wherein the actuator 4 comprises a substrate 41 and a piezoelectric sheet 42, wherein at least one piezoelectric sheet 42 is bonded to one or both sides of the substrate 41 in the thickness direction, wherein the piezoelectric sheet 42 is bonded to the substrate 41 to form the actuator 4, and the piezoelectric sheet 42 causes the actuator 4 to vibrate under the excitation of an electrical signal;

[0102] The substrate 41 may be, but is not limited to, circular, rectangular, polygonal or elliptical, etc. In this embodiment, the substrate 41 is in the shape of a circular plate as an example. A single piezoelectric sheet 42 may be bonded to any side surface of the substrate 41 in the thickness direction to form a piezoelectric unimorph actuator 4; or two piezoelectric sheets 42 are respectively arranged on the two side surfaces of the substrate 41 in the thickness direction to form a piezoelectric bimorph actuator 4; or a plurality of piezoelectric sheets 42 are arranged on the same side surface of the substrate 41 in the thickness direction to form a composite multilayer piezoelectric actuator 4, etc. The piezoelectric sheet 42 causes the actuator 4 to vibrate under the excitation of an external periodic electrical signal;

[0103] The actuator 4 has a first main surface 4a and a second main surface 4b that are relatively arranged in the thickness direction. The first main surface 4a and / or the second main surface 4b are joined with a spacer 2. The spacer 2 is connected to the actuator 4 at one end close to the actuator 4, and the spacer 2 and the actuator 4 form a groove 21 with an opening at the end facing away from the actuator 4.

[0104] Specifically:

[0105] The spacer 2 can be bonded to one side or both sides of the substrate 41 constituting the actuator 4 in the thickness direction. At this time, it is not difficult to understand that the spacer 2 can be bonded to one side of the substrate 41 in the thickness direction, or to the other side of the substrate 41 in the thickness direction. Fig.17 and Fig.18 As shown, of course, when there are multiple spacers 2 at the same time, for example, the heat dissipation device of the present application can have a bidirectional working function. At this time, the spacers 2 need to be provided on both main surfaces of the actuator 4. The spacers 2 can be provided on both side surfaces of the substrate 41 in the thickness direction, such as Fig.19 As shown; Under this structure, when the spacer 2 and the piezoelectric sheet 42 are arranged on the same side surface of the substrate 41 in the thickness direction, the piezoelectric sheet 42 is located in the groove 21 of the spacer 2, and at the same time, the spacer 2 has a height protruding from the surface of the piezoelectric sheet 42, as shown in FIG. Fig.18 and 19 When the spacer 2 and the piezoelectric sheet 42 are respectively disposed on both side surfaces of the substrate 41 in the thickness direction, this limitation is not applied, and the bonding between the spacer 2 and the substrate 41 may be bonding or integrally formed.

[0106] In addition, the spacer 2 can also be joined to the side surface of the piezoelectric sheet 42 constituting the actuator 4 that is away from the actuator 4. Under this structure, it is not difficult to understand that when the actuator 4 constitutes the above piezoelectric single-chip actuator 4, the spacer 2 can be joined to the side surface of the piezoelectric sheet 42 constituting the piezoelectric single-chip actuator 4 that is away from the substrate 41; when the actuator 4 constitutes the above piezoelectric dual-chip actuator 4, the spacer 2 can be joined to the side surface of the piezoelectric sheet 42 on either side of the piezoelectric dual-chip actuator 4 that is away from the substrate 41. Of course, when there are multiple spacers 2 at the same time, for example, the pressure heat dissipation device of the present application can have a bidirectional working function. At this time, the first main surface 4a and the second main surface 4b of the actuator 4 need to be provided with a spacer 2. The spacer 2 can be respectively provided on the side surfaces of the piezoelectric sheets 42 on both sides of the piezoelectric dual-chip actuator 4 that are away from the substrate 41, such as Fig. 20 shown.

[0107] In addition, it is not difficult to understand that when there are multiple spacers 2 at the same time, the above-mentioned bonding methods of the spacers 2 can also be combined with each other. For example, the heat dissipation device of the present application can have a bidirectional working function. At this time, the first main surface 4a and the second main surface 4b of the actuator 4 need to be provided with spacers 2, wherein there is a spacer 2 bonded to the surface of the side of the piezoelectric sheet 42 constituting the actuator 4 away from the actuator 4, and there is another spacer 2 bonded to the side of the substrate 41 away from the actuator 4, such as Fig.21 As shown, under this structure, the connection between the spacer 2 and the substrate 41 can be adhesively bonded or integrally formed.

[0108] Of course, the joining method of the spacer 2 is not limited to this. The joining method of the spacer 2 follows the principle that the end of the spacer 2 close to the actuator 4 is connected to the actuator 4, and the spacer 2 and the actuator 4 form a groove 21 with an opening at the end facing away from the actuator 4.

[0109] In this embodiment, the actuator 4 is constructed as a piezoelectric single-crystal actuator 4, there is one spacer 2, and the spacer 2 is bonded to the surface of the substrate 41 located on the side where the second main surface 4b of the actuator 4 is located, for easy understanding.

[0110] The spacer 2 is bonded to the surface of the substrate 41 on the side where the second main surface 4b is located, and the end of the spacer 2 close to the substrate 41 is connected to the substrate 41, and the spacer 2 and the substrate 41 form a groove 21 with an opening at the end facing away from the substrate 41, such as Fig.17 As shown; the connection between the spacer 2 and the substrate 41 can be bonding or integrally formed, and the spacer 2 is an annular structure, so that the inner peripheral wall of the spacer 2 itself encloses the groove portion 21.

[0111] One end of the spacer 2 close to the substrate 41 is joined to the surface of the substrate 41 on the side where the second main surface 4b is located, and the diaphragm 1 is connected to the end of the spacer 2 facing away from the substrate 41, so that the vibration of the actuator 4 can directly drive the spacer 2 and the diaphragm 1 to vibrate, so as to transfer the vibration energy to the diaphragm 1 through mechanical coupling.

[0112] The diaphragm 1 is connected to one end of the spacer 2 away from the actuator 4 and covers the opening of the groove 21 , so that an excitation cavity 5 is formed between the substrate 41 , the groove 21 and the diaphragm 1 .

[0113] Thus, the diaphragm 1 is fixedly connected to the actuator 4 through the spacer 2, and the actuator 4 vibrates, causing the diaphragm 1 to vibrate, and this process is accompanied by the transfer of energy. The vibration energy generated by the actuator 4 under the excitation of the external electrical signal, on the one hand, drives the fluid in the excitation chamber 5 between the actuator 4 and the diaphragm 1 to produce pressure changes when the actuator 4 vibrates, thereby causing the diaphragm 1 to vibrate and transfer the energy to the diaphragm 1. On the other hand, the energy can be directly transferred to the diaphragm 1 through the mechanical coupling formed by the actuator 4 and the diaphragm 1. Compared with the prior art that only relies on the fluid to transfer vibration energy, the energy transfer efficiency is higher. Under the same excitation conditions, the diaphragm 1 can be caused to produce a larger amplitude to achieve a higher flow output. Under the same amplitude requirement, the input power of the actuator 4 can be reduced, the heat generation can be reduced, and the energy utilization rate, product stability and service life can be improved.

[0114] When the actuator 4 vibrates under the excitation of the electrical signal, it transfers the vibration energy to the diaphragm 1 to cause the diaphragm 1 to generate a vibration of a high-order resonance mode with at least two antinodes. The range of the high-order resonance mode is from the second-order resonance mode to the ninth-order resonance mode, that is, the vibration of the high-order resonance mode may be but is not limited to the vibration of the second-order resonance mode, the vibration of the third-order resonance mode, the vibration of the fourth-order resonance mode, the vibration of the fifth-order resonance mode, the vibration of the sixth-order resonance mode, the vibration of the seventh-order resonance mode, the vibration of the eighth-order resonance mode or the vibration of the ninth-order resonance mode. At least one hole portion 11 is respectively formed at at least two antinode positions 1-1 of the vibration of the diaphragm 1 or in the vicinity of the antinode position 1-1. The vicinity of the antinode position 1-1 refers to an area close to the side of the antinode position 1-1 but not including the antinode position 1-1 in the interval between the node position and the antinode position 1-1 of the vibration of the diaphragm 1.

[0115] The present embodiment is not limited to the formation of at least one hole 11 at at least two antinode positions 1-1 of the vibration of the diaphragm 1 or at the adjacent areas of the antinode positions 1-1; it may also be the formation of at least one hole 11 at each antinode position 1-1 of the vibration of the diaphragm 1 or at the adjacent areas of the antinode positions 1-1.

[0116] When the heat dissipation component is working, the piezoelectric sheet 42 causes the actuator 4 to vibrate under the stimulation of the electrical signal, and transmits the vibration energy to the diaphragm 1, so as to cause the diaphragm 1 to generate a vibration of a high-order resonance mode with at least two antinodes. The holes 11 formed at at least two antinode positions 1-1 of the vibration of the diaphragm 1 or in the vicinity of the antinode positions 1-1 inhale and discharge the fluid relatively independently during the working process. When the area where the hole 11 is located is deformed toward the side away from the actuator 4, the local volume of the area corresponding to the hole 11 in the excitation cavity 5 increases, the pressure decreases, and the external fluid enters the excitation cavity 5 along the hole 11. Fig. 22As shown; when the area where the hole 11 is located is deformed toward the actuator 4, the local volume of the area corresponding to the hole 11 in the excitation chamber 5 becomes smaller, the pressure increases, and the fluid sucked into the excitation chamber 5 in the previous process is discharged from the excitation chamber 5 along the hole 11 with a certain momentum. The fluid with a certain momentum flows out of the hole 11 to form a jet, and can entrain the surrounding fluid, further increasing the output flow rate, as shown in FIG. Fig.23 As shown, this goes back and forth.

[0117] It should be noted that, under this structure, the height of the excitation chamber 5 in the thickness direction of the actuator 4 may be greater than the sum of the maximum displacements of the actuator 4 and the diaphragm 1 when they vibrate and deform toward each other, so as to avoid motion interference between the actuator 4 and the diaphragm 1 during the vibration process and make full use of the vibration energy. In addition, under this structure, if the height of the excitation chamber 5 is too large, the fluid pressure and flow rate discharged from the excitation chamber 5 by the hole 11 will be reduced, which will affect the formation of the jet and even make it impossible to form a jet, and it will be impossible to draw in the surrounding fluid, thereby resulting in a reduction in the final output flow rate. Preferably, the height of the excitation chamber 5 in the thickness direction of the actuator 4 is not greater than 20 times the sum of the maximum displacements of the actuator 4 and the diaphragm 1 when they vibrate and deform toward each other.

[0118] The vibration generated by the diaphragm 1 can be a centrally symmetrical vibration mode. For example, when the diaphragm 1 vibrates in a first-order resonance mode, the vibration displacement at the center of the diaphragm 1 is the largest. Since there is only one central antinode 1-1a, its effective working space is mainly concentrated in the area of ​​the excitation cavity 5 opposite to the central antinode 1-1a of the actuator 4 and the diaphragm 1, while the vibration energy in areas outside the central antinode 1-1a of the actuator 4 and the diaphragm 1 is not effectively utilized, resulting in low overall energy utilization.

[0119] This situation can be effectively improved when the diaphragm 1 vibrates in a high-order resonance mode, because the diaphragm 1 in the high-order central symmetric resonance mode not only has a central antinode 1-1a, but also has an annular antinode 1-1b surrounding the central antinode 1-1a at a position further outward of the central antinode 1-1a, and the number of the annular antinodes 1-1b is related to the order of the resonance mode;

[0120] The spacer 2 is an annular structure, the inner peripheral wall of the spacer 2 and the substrate 41 enclose an annular groove 21, and the end of the spacer 2 away from the substrate 41 is fully or partially engaged with the diaphragm 1 on an annular path around the groove 21;

[0121] When the end of the annular spacer 2 facing away from the substrate 41 is completely engaged with the diaphragm 1 along the annular path around the groove 21:

[0122] The diaphragm 1 vibrates in a third-order resonance mode, and the antinode position 1-1 can be a central antinode 1-1a and an annular antinode 1-1b, respectively. The diaphragm 1 has a central antinode 1-1a at the central position, and an annular antinode 1-1b surrounding the central antinode 1-1a is provided at a position further outward from the central antinode 1-1a. At this time, since the vibration displacement of the diaphragm 1 is significantly increased compared with the prior art, even if the hole 11 is only provided in the central antinode 1-1a or in the vicinity of the central antinode 1-1a, or the hole 11 is only provided in the annular antinode 1-1b or in the vicinity of the annular antinode 1-1b, a higher output flow rate can be obtained. Of course, preferably, the hole 11 is provided in the central antinode 1-1a and the annular antinode 1-1b or in the vicinity of the annular antinode 1-1b, such as Figure 24-25 As shown ( Fig.24 The middle curve Q1 represents the extreme position state of the area where each hole portion 11 is located when it is vibrated and deformed in direction one during the vibration of the diaphragm 1, while Q2 represents the extreme position state of the area where each hole portion 11 is located when it is vibrated and deformed in direction two opposite to direction one during the vibration of the diaphragm 1). In this way, the effective working space of the excitation cavity 5 between the actuator 4 and the diaphragm 1 is no longer mainly concentrated in the central area of ​​the diaphragm 1, but is extended to a larger area than the central area, and the utilization rate of the vibration energy is higher;

[0123] The vibration generated by the diaphragm 1 can also be a vibration of a high-order resonance mode other than the central symmetric vibration mode; for example, when the diaphragm 1 vibrates in the second-order resonance mode, there are two antinodes that are axially symmetrically distributed. At this time, since the vibration displacement of the diaphragm 1 is significantly increased compared with the prior art, even if the hole 11 is only set at one of the antinode positions 1-1 or the adjacent area of ​​the antinode position 1-1, a higher output flow rate can be obtained. Of course, preferably, the hole 11 is simultaneously set at the two antinode positions 1-1 or the adjacent area of ​​the antinode position 1-1 that are axially symmetrically distributed, such as Figure 26-27 As shown, "+" indicates that the diaphragm 1 is convexly deformed in one direction, "-" indicates that the diaphragm 1 is convexly deformed in another direction, and the "area circled by a long line and a double short line" indicates the area where the antinode position 1-1 is located; when the diaphragm 1 vibrates in the fourth-order resonance mode, there are four antinodes distributed in an axisymmetric manner. Similarly, at this time, since the vibration displacement of the diaphragm 1 is significantly increased compared with the prior art, even if the hole 11 is only provided at one of the antinode positions 1-1 or in the vicinity of the antinode position 1-1, a higher output flow rate can be obtained. Preferably, the hole 11 is provided at the same time at the four antinode positions 1-1 or in the vicinity of the antinode position 1-1 distributed in an axisymmetric manner, as shown in FIG. Figure 28-29 As shown, in this way, the effective working space of the excitation cavity 5 between the actuator 4 and the diaphragm 1 is no longer mainly concentrated in the central area of ​​the diaphragm 1, but extends to a larger area than the central area, and the utilization rate of the vibration energy is higher;

[0124] The actuator 4 vibrates under external excitation and transmits the vibration energy to the diaphragm 1, thereby causing the diaphragm 1 to vibrate. The resonance mode of the coordinated vibration of the actuator 4 and the diaphragm 1 is related to the structural shape of the substrate 41, the structural shape of the diaphragm 1 and the connection method between the two. The above factors do not constitute a limitation on the scope of protection of the claims of the present invention. The substrate 41 can be but is not limited to circular, rectangular, polygonal or elliptical, etc., the shape of the diaphragm 1 can also be but is not limited to circular, rectangular, polygonal or elliptical, etc., and the spacer 2 connected between the substrate 41 and the diaphragm 1 can also be but is not limited to a circular ring structure, a rectangular ring structure, a polygonal ring structure or an elliptical ring structure, etc.

[0125] As for the diaphragm 1 alone, the diaphragm 1 may be rectangular, and the two sides of the short sides of the diaphragm 1 are fixedly connected to the substrate 41 through the spacer 2, and the two sides of the long sides of the diaphragm 1 are not fixed:

[0126] When the diaphragm 1 vibrates in the second-order resonance mode, there are two antinodes distributed along the long side. At this time, since the vibration displacement of the diaphragm 1 is significantly increased compared with the prior art, even if the hole 11 is only provided at one of the antinode positions 1-1 or the adjacent area of ​​the antinode position 1-1, a higher output flow rate can be obtained. Of course, preferably, the hole 11 is provided at both the antinode positions 1-1 or the adjacent area of ​​the antinode position 1-1 distributed along the long side, such as Figure 30-31 As shown;

[0127] When the diaphragm 1 vibrates in the third-order resonance mode, there are three antinodes distributed along the long side. At this time, since the vibration displacement of the diaphragm 1 is significantly increased compared with the prior art, even if the hole 11 is only set at one of the antinode positions 1-1 or the area adjacent to the antinode position 1-1, a higher output flow rate can be obtained. Of course, preferably, the hole 11 is simultaneously set at the three antinode positions 1-1 distributed along the long side or the area adjacent to the antinode position 1-1.

[0128] For another example, still only referring to the diaphragm 1, the diaphragm 1 is rectangular, and both the short side and the long side of the diaphragm 1 are fixedly connected to the substrate 41 through the spacer 2:

[0129] When the diaphragm 1 vibrates in the second-order resonance mode, there are two antinodes distributed along the long side. At this time, since the vibration displacement of the diaphragm 1 is significantly increased compared with the prior art, even if the hole 11 is only provided at one of the antinode positions 1-1 of the vibration of the diaphragm 1 or in the vicinity of the antinode position 1-1, a higher output flow rate can be obtained. Of course, preferably, the hole 11 is provided at both the antinode positions 1-1 distributed along the long side of the vibration of the diaphragm 1 or in the vicinity of the antinode position 1-1, such as Figure 32-33 As shown;

[0130] When the diaphragm 1 vibrates in a higher order resonance mode, there are also Fig.34 The resonance mode shown has six wave troughs. At this time, since the vibration displacement of the diaphragm 1 is significantly increased compared with the prior art, even if the hole 11 is only set at one of the wave trough positions 1-1 or in the vicinity of the wave trough position 1-1, a higher output flow rate can be obtained. Of course, preferably, the hole 11 is simultaneously set at the six wave trough positions 1-1 or in the vicinity of the wave trough position 1-1.

[0131] A reflecting plate 3 is provided on the side of the diaphragm 1 facing away from the actuator 4, so that a guide cavity 6 is formed between the reflecting plate 3 and the diaphragm 1. Obviously, if the actuator 4 is only provided with a spacing portion 2 and a diaphragm 1 on the first main surface 4a, then the reflecting plate 3 is also provided on the side where the first main surface 4a of the actuator 4 is located, so as to form a guide cavity 6 located on the side where the first main surface 4a is located; if the actuator 4 is only provided with a spacing portion 2 and a diaphragm 1 on the second main surface 4b, then the reflecting plate 3 is also provided on the side where the second main surface 4b of the actuator 4 is located, so as to form a guide cavity 6 located on the side where the second main surface 4b is located; if the actuator 4 is provided with a spacing portion 2 and a diaphragm 1 on both the first main surface 4a and the second main surface 4b, then the reflecting plates 3 can also be provided on the side where the first main surface 4a and the side where the second main surface 4b of the actuator 4 are located, respectively, so as to form a guide cavity 6 located on the side where the first main surface 4a and the guide cavity 6 located on the side where the second main surface 4b are located, so that the heat dissipation device can have a bidirectional working function.

[0132] The case where the diaphragm 1 generates a vibration in a fourth-order resonance mode other than the central symmetric vibration mode, and there are four axially symmetrically distributed antinodes, and the hole portion 11 is simultaneously provided at the four axially symmetrically distributed antinode positions 1-1 or adjacent areas is described as an example. Figure 28-29 shown.

[0133] A reflecting surface 311 arranged opposite to the hole 11 is provided on one side of the reflecting plate 3 close to the hole 11. Specifically, a reflecting portion 31 protruding from the reflecting plate 3 is formed in an area of ​​the reflecting plate 3 opposite to the hole 11. A surface of the reflecting portion 31 close to the hole 11 is formed as the reflecting surface 311. The orthographic projection of the reflecting surface 311 on the diaphragm 1 covers the hole 11. The axis of the hole 11 is arranged at an angle α to the reflecting surface 311, so that the gas jet ejected from the hole 11 deflects its flow direction after hitting the reflecting surface 311 and is ejected toward the outer peripheral side of the guide cavity 6. The angle α is an acute angle.

[0134] The angle α refers to the acute angle between the axis of the hole 11 and the reflective surface 311. In order to ensure that the airflow after the flow direction reversal can be ejected from the outer peripheral side of the guide cavity 6 as much as possible, and to prevent the airflow from hitting the upper and lower end walls of the guide cavity 6 after the flow direction is deflected, the angle α is preferably 30° to 70°. Figure 1 shown.

[0135] After the airflow direction is deflected, it can be ejected toward the periphery of the guide cavity 6 to dissipate heat to the heat source surrounding the heat dissipation device. Figure 2-3 shown.

[0136] Of course, when directional heat dissipation is required, for example, the heat source is laterally arranged on one side of the guide cavity 6, assuming that the heat source is arranged on the first direction F on the outer peripheral side of the guide cavity 6, at this time, it can be set that the ejection direction of the airflow direction restricted by the reflecting surface 311 after deflection is the same, and the airflow is ejected toward the first direction F on the outer peripheral side of the guide cavity 6 to dissipate heat from the heat source, or the ejection direction of the airflow direction restricted by the reflecting surface 311 after deflection is substantially the same. At this time, in order to ensure sufficient directional flow effect of the airflow, preferably, the airflow is ejected in a direction within an angle range of 45° on both sides of the first direction F on the outer peripheral side of the guide cavity 6 to dissipate heat from the heat source.

[0137] Specifically:

[0138] There is one reflecting surface 311, and the projection of one reflecting surface 311 on the diaphragm 1 covers all the holes 11. Under this structure, the airflow restricted by the reflecting surface 311 has the same ejection direction after deflection, and the airflow is ejected toward the first direction F on the outer peripheral side of the guide cavity 6 to dissipate heat from the heat source. Figure 4 shown.

[0139] There are multiple reflecting surfaces 311, and the orthographic projections of the multiple reflecting surfaces 311 on the diaphragm 1 respectively cover at least one of the hole portions 11; that is, the reflecting surface 311 can be a plurality of reflecting surfaces 311 formed discretely, and the orthographic projections of the multiple reflecting surfaces 311 on the diaphragm 1 respectively cover each hole portion 11. In this case, the airflow ejection direction restricted by the multiple reflecting surfaces 311 can be the same, and the airflow is ejected toward the first direction F on the outer peripheral side of the flow guide cavity 6; Fig. 27As shown, it is not difficult to understand that, at this time, there may be a situation where at least two hole portions 11 are collinear along the first direction F, which will inevitably lead to the situation that the reflecting surface 31) opposite to the hole portion 11 has a reflecting surface 311 adjacent to the outer peripheral side of the guide cavity 6 in the first direction F blocking the reflecting surface 311 away from the outer peripheral side of the guide cavity 6 in the first direction F; that is, the reflecting surface 311 on the upstream side of the first direction F among the multiple reflecting surfaces 311 is the upstream reflecting surface 311, and the reflecting surface 311 on the downstream side of the first direction F is the downstream reflecting surface 311b, in the projection plane perpendicular to the first direction F, the orthographic projection of the upstream reflection surface 311 and the orthographic projection of the downstream reflection surface 311b at least partially overlap, and the airflow touched by the downstream reflection surface 311b is deflected and ejected toward the first direction F on the outer peripheral side of the guide cavity 6; the upstream reflection surface 311 needs to be offset so that the airflow touched is deflected and ejected toward the approximate first direction F1 on the outer peripheral side of the guide cavity 6, and the angle β between the first direction F and the approximate first direction F1 is 30°-45°; Figure 5 As shown, the downstream reflecting surface 311b blocks the upstream reflecting surface 311. Here, the direction of the blocked upstream reflecting surface 311 needs to be adjusted. For example, the blocked upstream reflecting surface 311 can be rotated around the axis of the hole portion 11 by a certain angle so that the airflow ejection directions restricted by the multiple reflecting surfaces 311 are substantially the same, and the airflow is ejected in the direction within the angle range of 45° on both sides of the first direction F on the outer peripheral side of the guide cavity 6, as shown in FIG. Figure 6 shown.

[0140] In addition, it should be noted that the adjusted reflective surface 311 limits the fluid deflection direction, which may cause the ejected airflow to fail to reach the heat source surface. In this case, the airflow deflection direction defined by the adjusted reflective surface 311 can also be secondary oriented. For example, the reflective plate 3 is further formed with a baffle portion 32 protruding from the reflective plate 3. The baffle portion 32 is arranged on both sides of the first direction F of the guide cavity 6 to calibrate the airflow deflection direction to or close to the first direction F opposite to the heat source, such as Figure 7 As shown, the baffle portion 32 is used to make the gas jet ejected from the upstream reflecting surface 311 deflect its flow direction toward the first direction F after it hits the baffle portion 32; further, there may be two baffle portions 32, and a directional flow channel 7 extending along the first direction F is formed between the two baffle portions 32, and all the reflecting surfaces 311 are arranged in the directional flow channel 7 to better constrain the flow of the gas jet.

[0141] Of course, the reflecting portion 31 and the reflecting plate 3 can be integrally formed. Figure 8 As shown, the reflecting portion 31 and the reflecting plate 3 may also be fixedly connected, such as Figure 2 shown.

[0142] The diaphragm 1 can be made of metal film materials, such as copper foil, titanium foil, stainless steel foil, etc. Preferably, the diaphragm 1 is made of polymer materials, such as PET, PI, PPS, PEI, FEP or other polymer film materials, or the diaphragm 1 is made of a composite material composed of polymer materials and other metal materials, such as PI copper clad laminate / film, PET copper clad laminate / film, PET nickel-plated laminate / film, carbon fiber metal composite laminate / film, etc.; whether it is a polymer material or a composite material composed of a polymer material and other materials, compared with metal materials, they all show the characteristics of light weight and high elastic strain limit, and the limit amplitude during resonance is usually much higher than that of metal materials, which is particularly suitable for high requirements on flow output, such as heat dissipation of smart 3C terminal products.

[0143] Example 2

[0144] like Fig. 9 As shown, the difference between Example 2 and Example 1 is that the spacer 2 has a plurality of spacers 22, and the spacers 22 are all joined to the surface on the side of the second main surface 4b of the substrate 41 by bonding or integral molding, and the end of the spacer 22 close to the substrate 41 is connected to the substrate 41, and the plurality of spacers 22 are spaced apart and distributed around the annular path to form a groove 21 with the actuator 4, and the end of the spacer 22 facing away from the actuator 4 is fully or partially joined to the diaphragm 1 on the annular path around the groove 21.

[0145] That is, the substrate 41, the diaphragm 1 and the spacer 2 form an excitation cavity 5, and the spacer 2 forms the inner wall of the excitation cavity 5. The inner wall of the excitation cavity 5 can be closed and has no channel connected to the outside, and the spacer 2 is an annular structure; the inner wall of the excitation cavity 5 can also be open, and the gaps 82 between the multiple spacers 22 arranged at intervals form channels connected to the outside, and the channels connect the excitation cavity 5.

[0146] Although, when the volume of the excitation chamber 5 increases, external gas can enter the excitation chamber 5 through the above-mentioned channel and flow toward the center of the excitation chamber 5, when the volume of the excitation chamber 5 decreases, the gas entering the excitation chamber 5 from the above-mentioned channel reverses its flow direction before reaching the area opposite to and adjacent to the hole 11 in the excitation chamber 5, and flows out of the excitation chamber 5 along the original route. Therefore, it will not have a substantial impact on the suction and discharge of the gas from the hole 11, or the impact is very small, so the inner wall of the excitation chamber 5 can be open.

[0147] Example 3

[0148] like Fig.10As shown, the difference between Example 3 and Example 1 or 2 is that the piezoelectric sheet 42 is an annular structure with a hole 421 passing through the center, and the hole 421 is arranged opposite to the excitation cavity 5; the effect brought about by this is that the vibration displacement of the area where the actuator 4 is opposite to the hole 421 of the piezoelectric sheet 42 is much larger than the displacement at the periphery. At this time, if the effective vibration area of ​​the diaphragm 1 is also arranged to correspond to the hole 421 of the piezoelectric sheet 42, the diaphragm 1 can also produce a larger displacement after being excited, thereby, the excitation cavity 5 can obtain a larger volume change, which can further increase the output flow rate to meet application requirements.

[0149] Example 4

[0150] The difference between Example 4 and Example 1, 2 or 3 is that: it also includes a shell plate 8 and an elastic connecting portion 81, the shell plate 8 surrounds the actuator 4, one end of the connecting portion 81 is connected to the shell plate 8, and the other end is connected to the substrate 41, the substrate 41 is connected to the shell plate 8 by the connecting portion 81, and the actuator 4 is elastically supported on the shell plate 8 in a substantially unconstrained manner, the elastic support does not hinder the vibration of the actuator 4, and the outer periphery of the surface of the side opposite to the diaphragm 1 of the reflector 3 is fixed to the shell plate 8; the shell plate 8, the connecting portion 81 and the substrate 41 can be set separately or integrally formed, and the separate setting method is conducive to reducing the processing difficulty of each component, while the integral molding method can improve the integrity of the structure;

[0151] The connecting portion 81 may be formed as a continuous annular thin plate. In this case, at least one through hole 62 is provided on the connecting portion. Figure 11-12 As shown; the connecting portion 81 can also be formed as a plurality of elastic connecting beams arranged discretely, and the plurality of elastic connecting beams are evenly arranged on the outer circumference of the substrate 41, or the plurality of elastic connecting beams can be evenly arranged on the outer circumference of the substrate 41 in a grouped and paired manner, and the plurality of elastic connecting beams arranged discretely are spaced from each other, so that the shell plate 8 surrounds the actuator 4 in a manner of a gap 82 in the part other than the connecting portion 81, and the connecting portion 81 is located in the gap 82, as shown in FIG. Figure 13-14 As shown; the structural types of the connecting portion 81 are various and cannot be listed one by one, and are not limited here. As long as the actuator 4 can be elastically supported on the shell plate 8 in a substantially unconstrained manner, it should be regarded as belonging to the protection scope of the present invention. The actuator 4 in this embodiment is elastically supported on the shell plate 8 in a planar supporting manner. Specifically, the base, the connecting portion 81 and the shell plate 8 can be integrally formed.

[0152] It is not difficult to understand that a provision must be made on the shell plate 8 so that the gas jet ejected from the hole 11 deflects its flow direction after contacting the reflecting surface 311 and is ejected toward the outer peripheral side of the flow guide cavity 6, and then ejected to an outlet (not shown) outside the shell 8. The gas jet ejected from the outlet impacts the heat source to dissipate the heat from the heat source.

[0153] In addition, a partition plate 61 may be provided between the diaphragm 1 and the reflector 3. The partition plate 61 is fixedly connected to the shell plate 8. A flow hole 61-1 is provided on the partition plate 61 opposite to the hole portion 11. The flow hole 61-1 is coaxially arranged with the hole portion 11. The diameter of the flow hole 61-1 is 1 to 2.5 times the diameter of the hole portion 11. By providing the partition plate 61, the air intake and exhaust of the heat dissipation device can be relatively isolated, thereby improving the one-way gas transmission efficiency of the heat dissipation device, and thus improving the heat dissipation efficiency. Fig.35 shown.

[0154] Example 5

[0155] like Fig.15 As shown, the difference between Example 5 and Example 1, 2 or 3 is that: at least one connecting boss 43 located outside the spacer 2 is protruded from the surface of the actuator 4 on one side facing the reflector 3, and the connecting boss 43 can be integrally formed with the substrate 41. When there are multiple connecting bosses 43, the multiple connecting bosses 43 are evenly spaced and distributed on the outer periphery of the surface of the substrate 41 on one side facing the reflector 3, and the reflector 3 has a notch 33 in the area opposite to the connecting boss 43, and an elastic support portion 34 is formed in the notch 33, and the connecting boss 43 is fixedly connected to the elastic support portion 34 opposite to it;

[0156] Alternatively, at least one elastic connecting boss 43 located outside the spacer 2 protrudes from a surface of the actuator 4 facing the reflecting plate 3 , and the connecting boss 43 is fixedly connected to a side of the reflecting plate 3 close to the substrate 41 .

[0157] In this embodiment, the substrate 41 can be elastically supported on the reflector 3 along the vertical direction.

[0158] It is not difficult to understand that a single connecting boss 43 is provided, or the circumferential spacing between multiple connecting bosses 43 is formed so that the gas jet ejected from the hole portion 11 deflects its flow direction after contacting the reflecting surface 311 and is ejected toward the outer peripheral side of the guide cavity 6, and then ejected to the air outlet (not shown in the figure) outside the connecting boss 43, and the gas jet ejected from the air outlet impacts the heat source to dissipate the heat from the heat source.

[0159] In addition, a partition plate 61 may be provided between the diaphragm 1 and the reflector 3, the partition plate 61 is fixedly connected to the connecting boss 43, and a flow hole 61-1 is provided on the partition plate 61 opposite to the hole portion 11; the flow hole 61-1 is coaxially arranged with the hole portion 11, and the diameter of the flow hole 61-1 is 1 to 2.5 times the diameter of the hole portion 11; by providing the partition plate 61, the air intake and exhaust of the heat dissipation device can be relatively isolated, the one-way gas transmission efficiency of the heat dissipation device can be improved, and then the heat dissipation efficiency can be improved; it should be noted that when there is only one connecting boss 43, a flow hole 62 must also be provided on the area of ​​the connecting boss 43 between the partition portion and the vibration plate 41, such as Fig.36 shown.

[0160] Example 6

[0161] like Fig.16 As shown, the difference between the embodiment 6 and the embodiments 1, 2 or 3 is that: it further comprises an outer ring 9 and a support portion 91, the outer ring 9 surrounds the actuator 4 and has a height protruding from the actuator 4 along the thickness direction of the substrate 41;

[0162] The supporting portion 91 includes a cantilever portion 911 and a holding portion 912, wherein the holding portion 912 is engaged at a node position of vibration of the actuator 4, and the holding portion 912 is arranged on a side of the actuator 4 facing away from the reflecting plate 3, one end of the cantilever portion 911 is connected to a surface of the holding portion 912 facing away from the actuator 4, and the other end is connected to a side of the outer ring 9 facing away from the reflecting plate 3, and the side of the outer ring 9 facing the reflecting plate 3 is fixedly connected to the reflecting plate 3; wherein the holding portion 912 has one or two or more cantilever portions 911 has one or two or more cantilever portions 911, and the holding portion 912, when being one, may be an independently constructed annular structure.

[0163] It is not difficult to understand that a device is provided on the outer ring 9 so that the gas jet ejected from the hole 11 deflects its flow direction after hitting the reflecting surface 311 and ejects toward the outer peripheral side of the guide cavity 6, and then ejects to the outside of the connecting boss 43 (not shown in the figure). The gas jet ejected from the outlet impacts the heat source to dissipate the heat from the heat source.

[0164] In addition, a partition plate 61 may be provided between the diaphragm 1 and the reflector 3. The partition plate 61 is fixedly connected to the outer ring 9. A flow hole 61-1 is provided on the partition plate 61 opposite to the hole 11. The flow hole 61-1 is provided coaxially with the hole, and the diameter of the flow hole 61-1 is 1 to 2.5 times the diameter of the hole 11. By providing the partition plate 61, the air intake and exhaust of the heat dissipation device can be relatively isolated, thereby improving the one-way gas transport efficiency of the heat dissipation device and further improving the heat dissipation efficiency. It should be noted that when there is only one cantilever portion 911, a flow hole 62 must also be provided on the cantilever portion 911. Fig.37 shown.

[0165] The above-mentioned ideal embodiments of the present invention are for inspiration. Through the above-mentioned description, relevant staff can make various changes and modifications without departing from the technical idea of ​​the present invention. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A heat dissipation device based on a reflective surface, characterized in that: It comprises a heat dissipation component and at least one reflective plate (3); The heat dissipation component comprises a diaphragm (1), a spacer (2) and a piezoelectrically driven actuator (4); the actuator (4) comprises a first main surface (4a) and a second main surface (4b) arranged opposite to each other in the thickness direction; the first main surface (4a) and / or the second main surface (4b) are joined to the spacer (2); the spacer (2) is joined to the actuator (4) at one end close to the actuator (4); the diaphragm (1) is fixedly connected to an end of the spacer (2) facing away from the actuator (4), so that an excitation cavity (5) is formed between the actuator (4), the spacer (2) and the diaphragm (1); and a hole (11) communicating with the excitation cavity (5) is penetrated through a region of the diaphragm (1) opposite to the excitation cavity (5); The actuator (4) is used to cause the diaphragm (1) to vibrate, and the hole portion (11) is arranged at an antinode position (1-1) of the vibration of the diaphragm (1) or at an area adjacent to the antinode position (1-1); The reflecting plate (3) is arranged at a distance from the actuator (4) on the side of the diaphragm (1), so that a guide cavity (6) is formed between the reflecting plate (3) and the diaphragm (1); a reflecting surface (311) is arranged opposite to the hole (11) on the side of the reflecting plate (3) close to the hole (11); the orthographic projection of the reflecting surface (311) on the diaphragm (1) covers the hole (11); the axis of the hole (11) and the reflecting surface (311) are arranged at an angle α, so that a gas jet ejected from the hole (11) deflects its flow direction after contacting the reflecting surface (311) and ejects toward the outer peripheral side of the guide cavity (6); the angle α is an acute angle; A reflecting portion (31) protruding from the reflecting plate (3) is formed in an area of ​​the reflecting plate (3) opposite to the hole portion (11), and a surface of one side of the reflecting portion (31) close to the hole portion (11) is formed as a reflecting surface (311); When the actuator (4) vibrates under the stimulation of an electrical signal, it transmits vibration energy to the diaphragm (1), thereby causing the diaphragm (1) to generate vibration in a high-order resonance mode having at least two antinodes, and at least one hole portion (11) is respectively formed at at least two antinode positions (1-1) of the vibration of the diaphragm (1) or in the vicinity of the antinode position (1-1).

2. The heat dissipation device based on a reflective surface according to claim 1, characterized in that: There is one reflecting surface (311), and the orthographic projection of the reflecting surface (311) on the diaphragm (1) covers all the hole portions (11).

3. The heat dissipation device based on a reflective surface according to claim 1, characterized in that: There are a plurality of reflection surfaces (311), and the orthographic projections of the plurality of reflection surfaces (311) on the diaphragm (1) respectively cover at least one of the hole portions (11).

4. The heat dissipation device based on a reflective surface according to claim 3, characterized in that: The airflows touched by the multiple reflecting surfaces (311) are ejected in the same direction after the flow direction is deflected, and are all ejected in the first direction (F) on the outer peripheral side of the flow guide cavity (6).

5. The heat dissipation device based on a reflective surface according to claim 3, characterized in that: Among the plurality of reflecting surfaces (311), the reflecting surface (311) on the upstream side of the first direction (F) is an upstream reflecting surface (311), and the reflecting surface (311) on the downstream side of the first direction (F) is a downstream reflecting surface (311b), and in a projection plane perpendicular to the first direction (F), an orthographic projection of the upstream reflecting surface (311) and an orthographic projection of the downstream reflecting surface (311b) at least partially overlap; The airflow touched by the downstream reflection surface (311b) is deflected and ejected toward a first direction (F) on the outer peripheral side of the flow guide cavity (6); The upstream reflection surface (311) is offset, so that the airflow touched is deflected and ejected toward an approximately first direction (F1) on the outer peripheral side of the flow guide cavity (6), and the angle β between the first direction (F) and the approximately first direction (F1) is 30°-45°.

6. The heat dissipation device based on a reflective surface according to claim 5, characterized in that: The reflector (3) is further formed with a baffle portion (32) protruding from the reflector (3), the baffle portion (32) being used to cause the gas jet ejected from the upstream reflective surface (311) to deflect in a first direction (F) after contacting the baffle portion (32).

7. The heat dissipation device based on a reflective surface according to claim 6, characterized in that: There are two baffle portions (32), and a directional flow channel (7) extending along a first direction (F) is formed between the two baffle portions (32), and all the reflection surfaces (311) are arranged in the directional flow channel (7).

8. The heat dissipation device based on a reflective surface according to claim 1, characterized in that: The reflecting portion (31) is integrally formed with or fixedly connected to the reflecting plate (3).

9. The heat dissipation device based on a reflective surface according to claim 1, characterized in that: The actuator (4) generates vibrations under the stimulation of an electrical signal and transmits vibration energy to the diaphragm (1), thereby causing the diaphragm (1) to generate vibrations in a high-order resonance mode. At least one hole portion (11) is formed at each antinode position (1-1) of the vibration of the diaphragm (1) enclosing the excitation cavity (5) or at a region adjacent to the antinode position (1-1).

10. The heat dissipation device based on a reflective surface according to claim 1, characterized in that: The high-order resonance mode ranges from the second-order resonance mode to the ninth-order resonance mode.

11. The heat dissipation device based on a reflective surface according to any one of claims 1 to 8, characterized in that: The angle α is 30° to 70°.

12. The heat dissipation device based on a reflective surface according to any one of claims 1 to 8, characterized in that: The diaphragm (1) is made of a polymer material, or a composite material of a polymer material and a metal material.

13. The heat dissipation device based on a reflective surface according to any one of claims 1 to 8, characterized in that: The actuator (4) comprises a substrate (41) and a piezoelectric sheet (42); at least one piezoelectric sheet (42) is bonded to one or both surfaces of the substrate (41) in a thickness direction; the piezoelectric sheet (42) and the substrate (41) are bonded to form the actuator (4); and the piezoelectric sheet (42) causes the actuator (4) to vibrate under the stimulation of an electrical signal; The spacer (2) and the actuator (4) form a groove (21) having an opening at one end facing away from the actuator (4); the diaphragm (1) is fixedly connected to the end of the spacer (2) facing away from the actuator (4) and covers the opening of the groove (21), so that an excitation cavity (5) is formed between the actuator (4), the groove (21) and the diaphragm (1).

14. The heat dissipation device based on a reflective surface according to any one of claims 1 to 8, characterized in that: It also includes a shell plate (8) and an elastic connecting portion (81), wherein the shell plate (8) surrounds the actuator (4), one end of the connecting portion (81) is connected to the shell plate (8), and the other end is connected to the actuator (4), and the outer periphery of the surface of the side of the reflective plate (3) opposite to the diaphragm (1) is fixed to the shell plate (8).

15. The heat dissipation device based on a reflective surface according to claim 14, characterized in that: The shell plate (8) surrounds the actuator (4) via a gap (82), and the connecting portion (81) is located within the gap (82).

16. The heat dissipation device based on a reflective surface according to claim 14, characterized in that: A partition plate (61) is further provided between the diaphragm (1) and the reflective plate (3), the partition plate (61) being fixedly connected to the shell plate (8), and a flow hole (61-1) is provided on the partition plate (61) directly opposite the hole portion (11).

17. The heat dissipation device based on a reflective surface according to any one of claims 1 to 8, characterized in that: At least one connecting boss (43) located outside the spacer (2) protrudes from a surface of one side of the actuator (4) facing the reflector plate (3); The reflecting plate (3) has a notch (33) in an area opposite to the connecting boss (43), an elastic support portion (34) is formed in the notch (33), and the connecting boss (43) is fixedly connected to the elastic support portion (34) opposite to the notch; or, the connecting boss (43) is elastic, and the connecting boss (43) is fixedly connected to a side of the reflecting plate (3) close to the actuator (4).

18. The heat dissipation device based on a reflective surface according to claim 17, characterized in that: A partition plate (61) is further provided between the diaphragm (1) and the reflector plate (3), the partition plate (61) being fixedly connected to the connecting boss (43), and a flow hole (61-1) is provided on the partition plate (61) directly opposite the hole portion.

19. The heat dissipation device based on a reflective surface according to any one of claims 1 to 8, characterized in that: It also includes an outer ring (9) and a support portion (91), wherein the outer ring (9) surrounds the actuator (4) and has a height protruding from the actuator (4) along the thickness direction of the actuator (4); The supporting portion (91) comprises a cantilever portion (911) and a retaining portion (912); the retaining portion (912) is joined to a node position of vibration of the actuator (4); the retaining portion (912) is arranged on a first main surface (4a) of the actuator (4); one end of the cantilever portion (911) is fixedly connected to a surface of the retaining portion (912) facing away from the actuator (4); the other end is joined to a side of the outer ring (9) facing away from the reflector (3); and the side of the outer ring (9) facing the reflector (3) is fixedly connected to the reflector (3).

20. The heat dissipation device based on a reflective surface according to claim 19, characterized in that: A partition plate (61) is further provided between the diaphragm (1) and the reflective plate (3); the partition plate (61) is fixedly connected to the outer ring (9); and a flow hole (61-1) is provided on the partition plate (61) directly opposite the hole portion (11).

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