Active heat dissipation device and projection optical machine

Abstract

The application discloses an active heat dissipation device and a projection light machine, and relates to the technical field of imaging equipment. The active heat dissipation device comprises a box shell, a pressure regulating element and a blocking element, the box shell is provided with an air inlet hole and an air outlet hole; the pressure regulating element divides the space in the box shell into a first chamber and a second chamber which are in communication with each other; the pressure regulating element can be switched to a first position, a second position or a third position; the blocking element is used for blocking the air outlet hole when the pressure regulating element is switched from the first position or the third position to the second position, and the blocking element is used for opening the air outlet hole when the pressure regulating element is switched from the second position or the first position to the third position. The active heat dissipation device in the application has the advantages of simple structure, no need of additional power structures such as heat dissipation fans, effective reduction of space occupation and cost reduction.

Description

Technical Field

[0001] This invention relates to the field of imaging equipment technology, and more specifically, to an active heat dissipation device. Furthermore, this invention also relates to a projection optical engine including the aforementioned active heat dissipation device. Background Technology

[0002] Micro-projection technology is a new and modern projection display technology. Micro-projection technology requires the use of a projection optical engine. When the projection optical engine is working, the continuous illumination of the light beam from the optical engine's LED lamp generates a large amount of heat. The main body of the optical engine absorbs this heat and expands and deforms, causing the optical lenses inside the optical engine to shift. This affects the offset of the light path. When the optical lenses deviate significantly, the image projected by the optical engine will be blurry and unclear. This phenomenon is called thermal defocus.

[0003] Currently, most projection optical engines still contain some plastic lenses due to processing cycle, technology, and cost. Plastic lenses are relatively sensitive to temperature, and under continuous irradiation by LED lamp beams, their temperature will rise, which may cause problems such as film cracking and melting; it may even lead to poor resolution of the projection optical engine or damage to the equipment.

[0004] In addition, during the assembly of the optical engine, a series of issues such as the assembly environment and the operation of the staff may cause some suspended particles in the air to be adsorbed on the optical lenses, resulting in dirt on the optical lenses, which will greatly affect the brightness of the optical engine.

[0005] In existing technologies, the optical engine is typically cooled by an additional heat dissipation device, which requires additional space and has a complex structure and high cost.

[0006] In summary, how to provide a low-cost heat dissipation device that can reduce space occupation is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] In view of this, the purpose of the present invention is to provide an active heat dissipation device that can achieve active heat dissipation by adjusting the internal pressure of the housing shell. It has a simple structure, does not require additional power structures such as cooling fans, and can effectively reduce space occupation and lower costs.

[0008] Another object of the present invention is to provide a projection optical engine including the above-described active heat dissipation device.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] An active heat dissipation device, comprising:

[0011] The outer casing of the enclosure is equipped with air inlet and air outlet vents;

[0012] A pressure adjustment control is disposed inside the housing shell and divides the space inside the housing shell into a first chamber and a second chamber that are interconnected. The air inlet is located in the first chamber and the air outlet is located in the second chamber. The pressure adjustment control can be switched to a first position, a second position, or a third position.

[0013] A sealing element is disposed inside the housing shell and is used to block the vent when the pressure regulating control is switched from the first position or the third position to the second position, and to open the vent when the pressure regulating control is switched from the second position or the first position to the third position.

[0014] When the pressure adjustment control is in the first position, the pressure in the first chamber is equal to the pressure in the second chamber;

[0015] When the pressure adjustment control switch is switched from the first position or the third position to the second position, the pressure in the first chamber increases and the pressure in the second chamber decreases, and gas flows from the first chamber into the second chamber.

[0016] When the pressure adjustment control is switched from the second position or the first position to the third position, the pressure in the first chamber decreases and the pressure in the second chamber increases. Gas enters the first chamber through the air inlet and is discharged through the air outlet.

[0017] Optionally, the pressure regulating control includes a deformable structural component that can deform to the first position, the second position, or the third position.

[0018] Optionally, it further includes a first controller, wherein the deformation structure includes a first deformation element and a first piezoelectric ceramic disposed on the first deformation element, the first piezoelectric ceramic being electrically connected to the first controller to control the first piezoelectric ceramic to drive the first deformation element to deform from the first position or the third position to the second position, or to cause the first piezoelectric ceramic to drive the first deformation element to deform from the second position or the first position to the third position.

[0019] Optionally, the first deformable element is a first deformable metal sheet, the first piezoelectric ceramic is disposed on the upper or lower surface of the first deformable metal sheet, and the first controller applies an alternating voltage to the first piezoelectric ceramic to cause the first piezoelectric ceramic to elongate or shorten, and the first deformable metal sheet to arch upward to the second position or bend downward to the third position under the action of the first piezoelectric ceramic; when the first piezoelectric ceramic is in a de-energized state, the first deformable metal sheet is located in the first position.

[0020] Optionally, the sealing member is movably disposed inside the housing between the fourth position and the fifth position, and when the sealing member is in the fourth position, it blocks the vent, and when the sealing member is in the fifth position, it opens the vent.

[0021] Optionally, it also includes a second controller, wherein the sealing element includes a second deformation element and a second piezoelectric ceramic disposed on the second deformation element, the second piezoelectric ceramic can drive the second deformation element to deform to a fourth position or a fifth position; and when the second deformation element is in the fourth position, it blocks the vent, and when the second deformation element is in the fifth position, it opens the vent.

[0022] The second piezoelectric ceramic is connected to the second controller to control the second piezoelectric ceramic to deform the second deformation element to block the vent, or to control the second piezoelectric ceramic to deform the second deformation element to open the vent.

[0023] Optionally, the second deformable element is a second deformable metal sheet, and the second piezoelectric ceramic is disposed on the upper or lower surface of the second deformable metal sheet. The second controller applies a single-phase pulse voltage to the second piezoelectric ceramic, and when the second piezoelectric ceramic is electrically connected to the second controller, the second piezoelectric ceramic drives the second deformable metal sheet to arch towards the pressure regulating control to the fifth position. When the second piezoelectric ceramic is de-energized, the second deformable metal sheet is located at the fourth position.

[0024] Optionally, a dustproof and breathable membrane is attached to the outside of the air inlet.

[0025] A projection optical engine includes an optical engine body, a top cover device disposed on the optical engine body, and an active heat dissipation device as described above. The active heat dissipation device is disposed inside the top cover device, and the vent is connected to the internal space of the optical engine body.

[0026] Optionally, the optical engine body is provided with an optical lens and an air passage, and the bottom of the optical engine body is provided with an exhaust port. One end of the air passage is connected to the exhaust port, and the other end is connected to the exhaust port. The optical lens is disposed in the air passage.

[0027] During the use of the active heat dissipation device provided by this invention, when the pressure regulating control is in the first position, the pressure in the first chamber is equal to the pressure in the second chamber. When the pressure regulating control is switched from the first or third position to the second position, it will compress the first chamber, causing its volume to decrease and the volume of the second chamber to increase. During this process, the pressure in the first chamber increases and the pressure in the second chamber decreases. At this time, the sealing component blocks the vent. Under the action of pressure, the gas in the first chamber quickly enters the second chamber, so that the pressure in the first and second chambers returns to the same state. When the pressure regulating control is switched from the second or third position to the second position, it will compress the first chamber, causing its volume to decrease and the volume of the second chamber to increase. When the position is switched to the third position, the second chamber is compressed, reducing its volume and increasing the volume of the first chamber. During this process, the pressure in the first chamber decreases, while the pressure in the second chamber increases. Gas enters the first chamber through the air inlet, and at this time, the air outlet opens. The air pressure outside the air outlet is lower than the pressure in the second chamber, causing the gas in the second chamber to be discharged through the air outlet. This process is repeated, and the pressure adjustment control repeatedly switches between the second and third positions, enabling a cycle in which gas enters the housing through the air inlet and is discharged through the air outlet. The gas discharged through the air outlet can dissipate heat from structures that require cooling.

[0028] In this application, an active heat dissipation device can be installed on the surface of the structure that needs heat dissipation. By controlling the pressure regulating component to switch between the first position, the second position, and the third position, the gas completes a cycle of entering the outer shell of the housing through the air inlet and exiting through the air outlet. The gas exiting through the air outlet is used to dissipate heat from the structure that needs heat dissipation. The structure is simple and does not require additional power structures such as cooling fans, which can effectively reduce space occupation and reduce costs.

[0029] In addition, the present invention also provides a projection optical engine including the above-described active heat dissipation device. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0031] Figure 1 A schematic diagram of a specific embodiment of the active heat dissipation device provided by the present invention;

[0032] Figure 2 This is a schematic diagram of the active heat dissipation device provided by the present invention, in which the pressure adjustment control is located in the first position.

[0033] Figure 3This is a schematic diagram of the active heat dissipation device provided by the present invention, in which the pressure adjustment control is located in the second position.

[0034] Figure 4 This is a schematic diagram of the active heat dissipation device provided by the present invention, in which the pressure adjustment control is located in the third position.

[0035] Figure 5 A schematic diagram of a specific embodiment of the projection optical engine provided by the present invention;

[0036] Figure 6 for Figure 5 A schematic diagram of a projection optical engine with optical lenses installed;

[0037] Figure 7 for Figure 5 A schematic diagram of the structure of the projection optical engine from another angle.

[0038] Figures 1-7 middle:

[0039] 01 is the main body of the optical engine, 011 is the exhaust vent, 02 is the top cover device, and 03 is the optical lens;

[0040] 1 is the outer shell of the box, 11 is the air inlet, 12 is the air outlet, 2 is the pressure adjustment control, 21 is the first deformable metal sheet, 22 is the first piezoelectric ceramic, 3 is the sealing component, 31 is the second deformable metal sheet, 32 is the second piezoelectric ceramic, and 4 is the dustproof and breathable membrane. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] The core of this invention is to provide an active heat dissipation device that can achieve active heat dissipation by adjusting the internal pressure of the housing shell. It has a simple structure, does not require additional power structures such as cooling fans, and can effectively reduce space occupation and lower costs.

[0043] Another core aspect of this invention is to provide a projection optical engine that includes the aforementioned active heat dissipation device.

[0044] This specific embodiment discloses an active heat dissipation device, including a housing shell 1, a pressure regulating control 2, and a sealing component 3. The housing shell 1 is provided with an air inlet 11 and an air outlet 12. The pressure regulating control 2 is disposed inside the housing shell 1 and divides the space inside the housing shell 1 into a first chamber and a second chamber that are interconnected. The air inlet 11 is located in the first chamber, and the air outlet 12 is located in the second chamber. The pressure regulating control 2 can be switched to a first position, a second position, or a third position. The sealing component 3 is disposed inside the housing shell 1 and is used to block the air outlet 12 when the pressure regulating control 2 is switched from the first position or the third position to the second position, and to open the air outlet 12 when the pressure regulating control 2 is switched from the second position or the first position to the third position.

[0045] When the pressure regulating control 2 is in the first position, the pressure in the first chamber is equal to the pressure in the second chamber. When the pressure regulating control 2 is switched from the first or third position to the second position, the gas in the first chamber is compressed, the pressure in the first chamber increases, the pressure in the second chamber decreases, and the gas flows from the first chamber into the second chamber. When the pressure regulating control 2 is switched from the second or first position to the third position, the second chamber is compressed, the pressure in the first chamber decreases, the pressure in the second chamber increases, and the gas flows from the air inlet 11 into the first chamber and is discharged from the air outlet 12.

[0046] It should be noted that the first position, second position, and third position mentioned in this specific embodiment do not refer to the installation position of a specific location of the pressure regulating control 2 within the housing shell 1, but rather to the overall position of the pressure regulating control 2 within the housing shell 1. Specifically, the pressure regulating control 2 may be fixed within the housing shell 1, and may be deformable and bent to the first position, second position, or third position; or the pressure regulating control 2 may be movably disposed within the housing shell 1 and may be moved to the first position, second position, or third position; or the pressure regulating control 2 may be rotatably disposed within the housing shell 1 and may be rotated to the first position, second position, or third position.

[0047] In the process of using the active heat dissipation device provided in this specific embodiment, when the pressure regulating control 2 is in the first position, the pressure in the first chamber is equal to the pressure in the second chamber; when the pressure regulating control 2 switches from the first position or the third position to the second position, it will compress the first chamber, causing the volume of the first chamber to decrease and the volume of the second chamber to increase. During this process, the pressure in the first chamber increases and the pressure in the second chamber decreases. At this time, the sealing member 3 blocks the vent 12. Under the action of pressure, the gas in the first chamber quickly enters the second chamber, so that the pressure in the first chamber and the second chamber reach the same state again; when the pressure regulating control 2 switches from the second position or the first position... When the device is switched to the third position, the second chamber is compressed, reducing its volume and increasing the volume of the first chamber. During this process, the pressure in the first chamber decreases, while the pressure in the second chamber increases. Gas enters the first chamber through the air inlet 11, and at this time, the air outlet 12 opens. The air pressure outside the air outlet 12 is lower than the pressure in the second chamber, causing the gas in the second chamber to be discharged through the air outlet 12. This process is repeated, and the pressure adjustment control 2 switches between the second and third positions repeatedly, enabling a cycle in which gas enters the housing shell 1 through the air inlet 11 and is discharged through the air outlet 12. The gas discharged through the air outlet 12 can dissipate heat from structures that require cooling.

[0048] In this application, an active heat dissipation device can be installed on the surface of the structure that needs heat dissipation. By controlling the pressure regulating component to switch between the first position, the second position, and the third position, the gas completes a cycle of entering the outer shell 1 from the air inlet 11 and being discharged from the air outlet 12. The gas discharged from the air outlet 12 is used to dissipate heat from the structure that needs heat dissipation. The structure is simple and does not require additional power structures such as cooling fans, which can effectively reduce the space occupied and reduce costs.

[0049] In one specific embodiment, the pressure regulating control 2 includes a deformable structural member that can deform to a first position, a second position, or a third position.

[0050] Specifically, the deformable structural component can be an elastic sheet-like structure that deforms under the action of external force. The external force can be a tensile or compressive force applied to the deformable structural component, which can be provided by a power device or manually controlled. The deformable structural component can also be a structure that deforms due to changes in electrodes when energized. Specifically, the deformable structural component can be a piezoelectric ceramic or a piezoelectric limiting plate.

[0051] Based on the above embodiments, the active heat dissipation device further includes a first controller, and the deformation structure includes a first deformation element and a first piezoelectric ceramic 22 disposed on the first deformation element. The first piezoelectric ceramic 22 is electrically connected to the first controller to control the first piezoelectric ceramic 22 to drive the first deformation element to deform from a first position or a third position to a second position, or to cause the first piezoelectric ceramic 22 to drive the first deformation element to deform from a second position or a first position to a third position.

[0052] The first deformable component can be a plastic part, a metal part, or an alloy material that has elastic deformation.

[0053] Specifically, the first deformable element can be a first deformable metal sheet 21, and the first piezoelectric ceramic 22 can be disposed on the upper or lower surface of the first deformable metal sheet 21. The first controller applies an alternating voltage to the first piezoelectric ceramic 22 so that the first piezoelectric ceramic stretches or shortens, and the first deformable metal sheet 21 arches upward to the second position or bends downward to the third position under the action of the first piezoelectric ceramic 22. When the first piezoelectric ceramic 22 is in the de-energized state, the first deformable metal sheet 21 is located in the first position.

[0054] like Figure 1-4 As shown, the first piezoelectric ceramic 22 is disposed on the upper surface of the first deformable metal sheet 21. During use, when the first piezoelectric ceramic 22 is in a de-energized state, such as... Figure 2 As shown, the first deformable metal sheet 21 is located in the first position; when both the upper and lower surfaces of the first piezoelectric ceramic 22 are electrically connected to the first controller, and the upper surface of the first piezoelectric ceramic 22 is connected to the positive terminal of the power supply and the lower surface of the first piezoelectric ceramic 22 is connected to the negative terminal of the power supply, as shown... Figure 3 As shown, the first piezoelectric ceramic 22 is deformed and elongated, causing the first deformed metal sheet 21 to arch upwards to the second position; the direction of the current applied to the first piezoelectric ceramic 22 is changed, so that the upper surface of the first piezoelectric ceramic 22 is connected to the negative terminal of the power supply and the lower surface of the first piezoelectric ceramic 22 is connected to the positive terminal of the power supply, as shown. Figure 4 As shown, the first piezoelectric ceramic 22 deforms, shortens, and thickens, causing the first deformable metal sheet 21 to... Figure 3 The state shown is bent downwards to the third position.

[0055] In this specific embodiment, by changing the direction of the current flowing through the first piezoelectric ceramic 22, the first piezoelectric ceramic 22 is deformed, thereby driving the first deformable metal sheet 21 to switch between the first position, the second position, and the third position. The structure is simple and the control is convenient.

[0056] In one specific embodiment, the sealing member 3 is movably disposed inside the housing 1 between the fourth position and the fifth position, and when the sealing member 3 is in the fourth position, it blocks the vent 12, and when the sealing member 3 is in the fifth position, it opens the vent 12.

[0057] Specifically, an electromagnet can be installed inside the outer shell 1 of the enclosure, and the sealing component 3 can be made of ferrous material or magnetic material. By controlling the direction of the current flowing through the electromagnet, the sealing component 3 can be attracted to move between the fourth and fifth positions.

[0058] Furthermore, a sliding groove can be provided inside the outer shell 1 of the housing, and the sealing component 3 can be movably installed along the sliding groove.

[0059] In another specific embodiment, the active heat dissipation device further includes a second controller. The sealing member 3 includes a second deformable member and a second piezoelectric ceramic 32 disposed on the second deformable member. The second piezoelectric ceramic 32 can drive the second deformable member to deform to a fourth position or a fifth position. When the second deformable member is in the fourth position, it blocks the vent 12. When the second deformable member is in the fifth position, it opens the vent 12. The second piezoelectric ceramic 32 is connected to the second controller to control the second piezoelectric ceramic 32 to drive the second deformable member to deform to block the vent 12, or to control the second piezoelectric ceramic 32 to drive the second deformable member to deform to open the vent 12.

[0060] The second deformable component can be a plastic part, a metal part, or an alloy material that has elastic deformation.

[0061] Specifically, the second deformable element is a second deformable metal sheet 31, and the second piezoelectric ceramic 32 is disposed on the upper or lower surface of the second deformable metal sheet 31. When the second controller supplies a single-phase pulse voltage to the second piezoelectric ceramic 32 and the second piezoelectric ceramic 32 is electrically connected to the second controller, the second piezoelectric ceramic 32 drives the second deformable metal sheet 31 to arch towards the pressure regulating control 2 to the fifth position. When the second piezoelectric ceramic 32 is de-energized, the second deformable metal sheet 31 is located in the fourth position.

[0062] Combination Figures 1-4 As shown, the second piezoelectric ceramic 32 is disposed on the upper surface of the second deformable metal sheet 31. In actual use, when the second piezoelectric ceramic 32 is in a de-energized state, such as... Figure 2 As shown, the second deformable metal sheet 31 is located in the fourth position, blocking the vent 12; when the pressure regulating control 2 is switched from the first or third position to the second position, as... Figure 3 As shown, the second piezoelectric ceramic 32 is in a de-energized state, blocking the vent 12; when the pressure regulating control 2 is switched from the second or first position to the third position, the second piezoelectric ceramic 32 is in an electrically connected state, as shown. Figure 4 As shown, the second piezoelectric ceramic 32 deforms and elongates, causing the second deformed metal sheet 31 to arch upward to the fifth position, opening the vent 12.

[0063] Combination Figures 2-4As shown, when the pressure regulating control 2 is switched from the second position or the first position to the third position, the second piezoelectric ceramic 32 deforms and elongates, causing the second deformed metal sheet 31 to arch upward to the fifth position, so that the gas in the second chamber is squeezed and the pressure increases, so that the gas in the second chamber flows out through the vent 12.

[0064] Based on the above embodiments, in order to prevent impurities from entering the outer shell 1 of the box, a dustproof and breathable membrane 4 can be attached to the outside of the air inlet 11.

[0065] In addition to the above-mentioned active heat dissipation device, the present invention also provides a projection optical engine including an optical engine body 01, an upper cover device 02 disposed on the optical engine body 01, and an active heat dissipation device of any of the above. The active heat dissipation device is disposed in the upper cover device 02, and the vent 12 communicates with the internal space of the optical engine body 01. The structure of other parts of the projection optical engine is described in the prior art and will not be repeated here.

[0066] like Figure 6 As shown, the upper part of the optical engine body 01 is provided with an upper cover device 02, such as... Figure 5 As shown, the upper cover device 02 is equipped with multiple active heat dissipation devices, combined with Figure 1 The outer shell 1 is a square box, and the vent 12 is located on the upper cover device 02 and at the bottom of the outer shell 1. Multiple pressure adjustment devices 2 and sealing devices 3 can be installed in the same outer shell 1. The vent 12 is connected to the internal space of the optical engine body 01. In actual use, the gas blown out by the vent 12 enters the optical engine body 01, which can cool down the heat-generating elements inside the optical engine body 01 and prevent the optical lens 03 from shifting due to structural heat absorption deformation, thereby avoiding thermal defocusing.

[0067] In addition, combined Figure 6 , Figure 7 As shown, the optical engine body 01 is provided with an optical lens 03 and an air passage. The bottom of the optical engine body 01 is provided with an exhaust port 011. One end of the air passage is connected to the exhaust port 12, and the other end is connected to the exhaust port 011. The optical lens 03 is located in the air passage.

[0068] In actual use, the gas blown out by the air outlet 12 is discharged through the air passage and the exhaust port 011. During the process of flowing through the air passage, it will clean the optical lens 03, reduce the dirt on the optical lens 03, and improve the brightness of the optical engine.

[0069] Furthermore, a dustproof and breathable membrane 4 can be installed in the exhaust vent 011.

[0070] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. Any combination of all embodiments provided by this invention is within the scope of protection of this invention and will not be elaborated upon here.

[0071] The active heat dissipation device and projection optical engine provided by the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. An active heat dissipation device, characterized in that, include: The outer shell of the box (1) is provided with an air inlet (11) and an air outlet (12). The pressure adjustment control (2) is set inside the outer shell (1) of the housing and divides the space inside the outer shell (1) into a first chamber and a second chamber that are interconnected. The air inlet (11) is located in the first chamber and the air outlet (12) is located in the second chamber. The pressure adjustment control (2) can be switched to a first position, a second position or a third position. A sealing element (3) is disposed inside the housing shell (1) and is used to block the air outlet (12) when the pressure regulating control (2) is switched from the first position or the third position to the second position, and to open the air outlet (12) when the pressure regulating control (2) is switched from the second position or the first position to the third position; the sealing element (3) can be moved or deformed to the fourth position or the fifth position, and when the sealing element (3) is in the fourth position, it blocks the air outlet (12), and when the sealing element (3) is in the fifth position, it opens the air outlet (12); When the pressure adjustment control (2) is in the first position, the pressure in the first chamber is equal to the pressure in the second chamber; When the pressure regulating control (2) is switched from the first position or the third position to the second position, the pressure in the first chamber increases and the pressure in the second chamber decreases, and the gas flows from the first chamber into the second chamber; When the pressure adjustment control (2) is switched from the second position or the first position to the third position, the pressure in the first chamber decreases and the pressure in the second chamber increases. Gas enters the first chamber through the air inlet (11) and is discharged through the air outlet (12).

2. The active heat dissipation device according to claim 1, characterized in that, The pressure regulating control (2) includes a deformable structural component, which can be deformed to the first position, the second position, or the third position.

3. The active heat dissipation device according to claim 2, characterized in that, It also includes a first controller. The deformation structure includes a first deformation element and a first piezoelectric ceramic (22) disposed on the first deformation element. The first piezoelectric ceramic (22) is electrically connected to the first controller to control the first piezoelectric ceramic (22) to drive the first deformation element to deform from the first position or the third position to the second position, or to cause the first piezoelectric ceramic (22) to drive the first deformation element to deform from the second position or the first position to the third position.

4. The active heat dissipation device according to claim 3, characterized in that, The first deformable element is a first deformable metal sheet (21), and the first piezoelectric ceramic (22) is disposed on the upper or lower surface of the first deformable metal sheet (21). The first controller applies an alternating voltage to the first piezoelectric ceramic (22) so that the first piezoelectric ceramic extends or shortens, and the first deformable metal sheet (21) arches upward to the second position or bends downward to the third position under the action of the first piezoelectric ceramic (22). When the first piezoelectric ceramic (22) is in a de-energized state, the first deformable metal sheet (21) is located in the first position.

5. The active heat dissipation device according to any one of claims 1-3, characterized in that, The sealing member (3) is movably disposed inside the outer shell (1) of the housing between the fourth position and the fifth position. When the sealing member (3) is in the fourth position, it blocks the air outlet (12). When the sealing member (3) is in the fifth position, it opens the air outlet (12).

6. The active heat dissipation device according to any one of claims 1-3, characterized in that, It also includes a second controller, the sealing member (3) includes a second deformation member and a second piezoelectric ceramic (32) disposed on the second deformation member, the second piezoelectric ceramic (32) can drive the second deformation member to deform to a fourth position or a fifth position; and when the second deformation member is in the fourth position, it blocks the air outlet (12), and when the second deformation member is in the fifth position, it opens the air outlet (12); The second piezoelectric ceramic (32) is connected to the second controller to control the second piezoelectric ceramic (32) to deform the second deformation element to block the air outlet (12), or to control the second piezoelectric ceramic (32) to deform the second deformation element to open the air outlet (12).

7. The active heat dissipation device according to claim 6, characterized in that, The second deformable element is a second deformable metal sheet (31). The second piezoelectric ceramic (32) is disposed on the upper or lower surface of the second deformable metal sheet (31). The second controller applies a single-phase pulse voltage to the second piezoelectric ceramic (32). When the second piezoelectric ceramic (32) is electrically connected to the second controller, the second piezoelectric ceramic (32) causes the second deformable metal sheet (31) to arch towards the pressure regulating control (2) to the fifth position. When the second piezoelectric ceramic (32) is in a de-energized state, the second deformable metal sheet (31) is located in the fourth position.

8. The active heat dissipation device according to any one of claims 1-3, characterized in that, A dustproof and breathable membrane (4) is attached to the outside of the air inlet (11).

9. A projection optical engine, characterized in that, It includes an optical engine body (01), an upper cover device (02) disposed on the optical engine body (01), and an active heat dissipation device according to any one of claims 1-8, wherein the active heat dissipation device is disposed inside the upper cover device (02), and the air outlet (12) communicates with the internal space of the optical engine body (01).

10. The projection optical engine according to claim 9, characterized in that, The optical engine body (01) is provided with an optical lens (03) and an air passage. The bottom of the optical engine body (01) is provided with an exhaust hole (011). One end of the air passage is connected to the air outlet (12), and the other end is connected to the exhaust hole (011). The optical lens (03) is located in the air passage.

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