Heat dissipation structure, electronic equipment and projector

Abstract

The invention relates to the field of electronic radiators, and discloses a heat dissipation structure, electronic equipment and a projector, the heat dissipation structure is provided with a closed cavity filled with a thermal medium, and the closed cavity is provided with at least one heat exchanger, at least one fan, at least one flow channel and at least one heating element; the flow channel is provided with at least one heat absorption section and at least one heat release section; the heat exchanger comprises a corrugated plate with a heat absorption surface and a heat release surface, the heat absorption surface is located in the closed cavity and located at the heat release section of the flow channel, and the heat release surface is located outside the closed cavity; the fan is located at the heat release section of the flow channel to promote forced convection of the heat medium with the heat release section and the heat absorption section of the flow channel on the heat absorption surface, so that the circulation efficiency of the heat medium in the closed cavity is improved; the heating element is arranged on the heat absorption section of the flow channel, and the heat medium can circulate with the heat absorption section of the flow channel on at least one face of the heating element. The scheme has the characteristics of light weight, small size and high heat exchange efficiency.

Description

Technical Field

[0001] The invention relates to the field of electronic radiators, and in particular to a heat dissipation structure, electronic equipment and a projector. Background Art

[0002] Since lighting equipment (illumination lamps, stage lights, projectors, printers, scanners, photolithography machines, etc.) generates a large amount of heat, the optical components on the light path are often sealed to prevent dust accumulation or for waterproofing requirements. For example, the projector will seal the optical cavity, making it difficult for the heat in the sealed cavity in the optical machine to transfer to the outside of the projector, which can easily cause the electronic components to fail and not operate normally.

[0003] At present, in order to solve the problem of heat accumulation in the closed cavity of lighting equipment, heat exchange is often carried out twice: the heat of the closed cavity is first transferred to the open cavity through heat conduction, and then the heat of the open cavity is discharged outside the shell. The heat exchange method is generally to use a fan combined with a liquid cooling radiator, a heat pipe, a plate radiator, a tubular radiator, etc. One or more combinations are used to transfer heat. The use of the above-mentioned traditional heat dissipation structure not only has the problems of large volume and heavy mass, but also has the problem of low heat exchange efficiency. The heat dissipation structure is also a factor that leads to low heat exchange efficiency, such as the long distance of heat transfer and the small heat conduction contact area between the closed cavity and the heat dissipation structure. If the above-mentioned traditional heat dissipation structure is used in both heat exchange processes, the volume of the tubular radiator 6 shown in the reference figure is almost one-third, making the problems of large volume and heavy mass more serious. These problems hinder the miniaturization of lighting equipment on the one hand, and on the other hand, it is difficult to meet the heat dissipation requirements of the closed cavity.

[0004] Therefore, it is particularly important to design a heat dissipation structure that is lightweight, small in size, and has high heat exchange efficiency. Summary of the invention

[0005] In order to overcome the deficiencies in the background technology and related technologies, the present invention provides a heat dissipation structure, an electronic device and a projector to solve the problems of large volume, heavy mass and low heat exchange efficiency of the heat dissipation structure in the prior art.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] In a first aspect, a heat dissipation structure is provided, comprising a closed cavity filled with a heat medium, wherein the closed cavity is provided with at least one heat exchanger, at least one fan, at least one flow channel and at least one heating element;

[0008] The flow channel is provided with at least one heat absorbing section and at least one heat releasing section;

[0009] The heat exchanger comprises a corrugated plate having a heat absorbing surface and a heat releasing surface, wherein the heat absorbing surface is located in a closed cavity and in a heat releasing section of the flow channel, and the heat releasing surface is located outside the closed cavity;

[0010] The fan is located in the heat release section of the flow channel, so as to force the heat medium to convect on the heat absorption surface and the heat release section and heat absorption section of the flow channel, so as to improve the circulation efficiency of the heat medium in the closed cavity;

[0011] The heating element is arranged at the heat absorbing section of the flow channel, and the heat medium can flow between at least one surface of the heating element and the heat absorbing section of the flow channel.

[0012] Optionally, the structure of the pleated plate is configured as follows:

[0013] The crest of the folded heat-absorbing surface in the closed cavity is the trough of the folded heat-releasing surface outside the closed cavity, and the heat-releasing surface forms an external circulation channel in the length direction of the trough; and / or

[0014] The trough formed by the folds of the heat absorbing surface in the closed cavity is the peak formed by the folds of the heat releasing surface outside the closed cavity, and the heat absorbing surface forms an internal circulation channel in the length direction of the trough.

[0015] Optionally, the heat exchanger includes stacked corrugated plates so that the wave crests of the heat-releasing surfaces of the corrugated plates are correspondingly connected to the wave crests of the second-order heat-absorbing surfaces of the second corrugated plates in the length direction of the wave crests.

[0016] Optionally, in the flow channel, the angle between the heat absorption section and the heat release section is 70°C~180°C, and / or the effective length of at least one section of the heat release section is less than or equal to the effective length of the heat absorption section and the total effective length of the heat release section is greater than or equal to the effective length of the heat absorption section.

[0017] Optionally, the flow channel includes a first flow channel and a second flow channel arranged in a stacked manner, so that the two surfaces of at least one heating element are respectively circulated with the heat absorption section of the first flow channel and the heat absorption section of the second flow channel, or the two surfaces of at least one heating element are circulated with the heat absorption section of the first flow channel, and the heat release section of the first flow channel is connected to the heat release section of the second flow channel, and the heat absorption section of the first flow channel is connected to the heat absorption section of the second flow channel.

[0018] Optionally, the heat exchanger includes a first heat exchanger and a second heat exchanger, the first flow channel and the second flow channel are both provided with two heat release sections and are respectively extended at both ends of the heat absorption section, and the first heat exchanger and the second heat exchanger are respectively arranged in the two heat release sections.

[0019] Optionally, the closed cavity is further provided with a reflective cup, the first heat release section of the second flow channel branches out into the third flow channel, the third flow channel first surrounds the reflective cup to absorb heat and then merges into the second heat release section of the second flow channel.

[0020] In a second aspect, an electronic device comprises the heat dissipation structure described in any one of the first aspect.

[0021] In a third aspect, a projector comprises a housing, the housing is provided with a third fan, a tubular heat sink, a third ventilation hole and a sealed optical machine, the optical machine comprises a light source, a reflective cup, an optical path cavity, a light output lens module and the heat dissipation structure according to any one of the first aspects, the light source and the tubular heat sink are connected by heat conduction;

[0022] The light source, the reflective cup, the heat absorbing section, the optical path cavity, and the light output lens module are sequentially arranged along the light output direction. The heating element includes a light valve. Each heat absorbing section allows light to pass through, and each heat releasing section avoids the optical path area.

[0023] The third fan drives the airflow to sequentially pass through the light-emitting lens module, the heat-releasing surface of the first heat exchanger, the air inlet and air outlet of the third fan, the air inlet and air outlet of the tubular radiator, and the third ventilation hole, so as to discharge the heat of the light-emitting lens module, the heat dissipation structure and the light source out of the shell, wherein the first heat exchanger simultaneously exchanges heat on the heat-releasing surface and the heat-absorbing surface with airflows in opposite directions.

[0024] Optionally, the projector further includes a fourth fan and a fourth ventilation hole;

[0025] The fourth fan drives the airflow to pass through the light-emitting lens module, the heat-releasing surface of the second heat exchanger, the air inlet and air outlet of the fourth fan, the air inlet and air outlet of the tubular radiator, and the fourth ventilation hole in sequence, so as to discharge the heat of the light-emitting lens module, the heat dissipation structure and the light source out of the shell, wherein the second heat exchanger simultaneously exchanges heat on the heat-releasing surface and the heat-absorbing surface with airflow in the same direction.

[0026] The beneficial effects of the present invention are as follows: by changing the structure of the heat exchanger and the flow channel, the heat transfer distance is shortened and the weight of the heat exchanger is reduced; the heat release section and the heat absorption section in the flow channel are designed in a multi-section manner and the angle and length ratio thereof are optimized; while reducing the space occupied by the flow channel, the heat dissipation effect is also improved, so that the heat dissipation structure, electronic equipment and projector have the characteristics of light weight, small size and high heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention can be better understood with reference to the following drawings and descriptions, in which the components in the drawings are not necessarily drawn to scale, but emphasis is placed on illustrating the principles of the present invention. In addition, in different views, the same reference numerals represent corresponding parts.

[0028] Figure 1is a cross-sectional schematic diagram of a heat dissipation structure or a projector in one embodiment;

[0029] Figure 2 for Figure 1 A schematic structural diagram of a heat dissipation structure or a projector in one embodiment;

[0030] Figure 3 This is a schematic structural diagram of a heat exchanger in one embodiment;

[0031] Figure 4 (a, b) are schematic diagrams of the structure of a heat exchanger in another embodiment;

[0032] Figure 5 for Figure 3 A schematic diagram of a derived structure of a heat exchanger in one embodiment;

[0033] Figure 6 for Figure 3 A schematic diagram of a derived structure of a heat exchanger in one embodiment;

[0034] Figure 7 for Figure 3 A schematic diagram of a derived structure of a heat exchanger in one embodiment;

[0035] Figure 8 is a schematic cross-sectional view of a portion of a flow channel in one embodiment;

[0036] Fig. 9 is a cross-sectional schematic diagram of a heat dissipation structure or a projector in one embodiment;

[0037] Fig.10 is a cross-sectional schematic diagram of a heat dissipation structure or a projector in one embodiment;

[0038] Fig.11 is a cross-sectional schematic diagram of a heat dissipation structure or a projector in one embodiment;

[0039] Fig.12 Schematic diagram of the structure of a heat dissipation structure or a projector in one embodiment.

[0040] Reference numerals: 11-first heat exchanger, 111-heat absorbing surface, 1110-second-order heat absorbing surface, 112-heat releasing surface, 1120-second-order heat releasing surface, 12-second heat exchanger; 21-first fan, 22-second fan, 23-third fan, 24-fourth fan, 25-horn; 31-first flow channel, 32-second flow channel, A-heat absorbing section; 41-first Fresnel lens, 42- LCD light valve, 43-insulating glass, 44-second Fresnel lens, 45-light output lens module; 51-light source, 510-reflective cup, 52-power module; 6-tubular radiator, 611-first heat pipe, 612-second heat pipe, 621-first fin, 622-second fin; 71-first ventilation hole, 72-second ventilation hole, 73-third ventilation hole, 74-fourth ventilation hole; 81-first baffle, 82-second baffle; 9-shell, 91-open cavity, 92-optical path cavity. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0042] In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] according to Figure 1 to Figure 12 A heat dissipation structure, an electronic device and a projector are shown in each embodiment.

[0044] First, as Fig.12 As shown, a heat dissipation structure is provided, which has a closed cavity filled with a heat medium, and the closed cavity is provided with a heat exchanger 11, a fan 21, a flow channel 31 / 32 and a heating element 42. The heat medium can be water (steam), gas, oil, molten salt and liquid metal. In one embodiment, the first flow channel 31 and the second flow channel 32 have a closed-loop flow channel surrounded by various parts, which can also be regarded as a flow channel. In another embodiment, the flow channel is not a closed-loop flow channel, and the heat medium can flow in a flow channel without a fixed direction, and circulate in the flow channel through molecular thermal motion to perform heat exchange.

[0045] The flow channel is provided with at least one heat absorbing section and at least one heat releasing section. The flow channel area where heat absorption occurs is the heat absorbing section, and the flow channel area extending at the end of the heat absorbing section (including the flow channel area formed by at least one part of the heat exchanger 11 / 12, the baffle 81 / 82, and the fan 21 / 22) belongs to the heat releasing section. Fig.12 As shown, a heat releasing section can also be formed by extending from one end of each heat absorbing section.

[0046] In one embodiment, if Figure 8 As shown, the flow channel is provided with two discontinuous heat absorbing sections A, the ends of which are extended to form two heat releasing sections. The flow channel area between the two heat absorbing sections can also be set as a heat releasing section to dissipate heat for heating elements in multiple locations.

[0047] In one embodiment, if Fig.12 As shown, the first flow channel 31 and the second flow channel 32 are divided into two flow channels or the closed-loop flow channel formed by the two is regarded as one flow channel. The flow channel is provided with two heat absorbing sections and two heat releasing sections, which can dissipate heat for one or more heating elements.

[0048] In one embodiment, if Figure 1 As shown, the first flow channel 31 and the second flow channel 32 are each provided with a heat absorbing section A, and two heat releasing sections are formed by extending at two ends of each heat absorbing section.

[0049] like Figure 3~4 As shown, the heat exchanger includes a corrugated plate, which is provided with a heat absorbing surface 111 and a heat releasing surface 112. The heat absorbing surface 111 is located in the closed cavity and in the heat releasing section of the flow channel, and the heat releasing surface 112 is located outside the closed cavity. The thickness of the corrugated plate is the distance of heat transfer, and the heat transfer distance between the heat absorbing end and the heat releasing end is shortened to improve the heat exchange efficiency. On the one hand, the corrugation increases the heat exchange area, and on the other hand, it can be extended to avoid deformation caused by thermal expansion and contraction and damage to the sealing.

[0050] The fan is located in the heat release section of the flow channel, which promotes the forced convection of the heat medium on the heat absorption surface and the heat release section and heat absorption section of the flow channel, so as to improve the circulation efficiency of the heat medium in the closed cavity.

[0051] The heating element is arranged in the heat absorbing section of the flow channel to transfer heat to the heat medium in the heat absorbing section. In one embodiment, the heating element is attached to the inner wall of the flow channel or becomes the inner wall of the flow channel, so that the heat medium can flow between one surface of the heating element and the heat absorbing section of the flow channel for heat exchange; in another embodiment, the heating element is not attached to the inner wall of the flow channel, so that the heat medium can flow between two surfaces of the heating element and the heat absorbing section of the flow channel for heat exchange.

[0052] In the heat absorption section of the flow channel, the heat of the heating element is first transferred to the heat medium, and the heat medium flows to the heat release section of the flow channel, and then transfers the heat carried by the heat medium to the heat absorption surface of the heat exchanger. The heat absorption surface finally transfers the heat to the heat release surface outside the closed cavity. At this point, the heat is transferred from the heat dissipation structure to the outside of the heat dissipation structure. The number, structure, and connection position relationship of the heat exchanger and the fan are simplified and optimized to make the heat dissipation structure lightweight.

[0053] Optionally, the corrugated plate is configured as follows:

[0054] In one embodiment, if Figure 3As shown, the trough formed by the wrinkles of the heat-absorbing surface 111 in the closed cavity is the peak formed by the wrinkles of the heat-releasing surface 112 outside the closed cavity, and the heat-absorbing surface 111 forms an inner circulation channel in the length direction of the trough. At the same time, the peak formed by the wrinkles of the heat-absorbing surface 111 in the closed cavity is the trough formed by the wrinkles of the heat-releasing surface 112 outside the closed cavity, and the heat-releasing surface 112 forms an outer circulation channel in the length direction of the trough.

[0055] In another embodiment, if Figure 4 As shown in a, the trough formed by the folds of the heat absorbing surface 111 in the closed cavity is the crest formed by the folds of the heat releasing surface 112 outside the closed cavity, and the heat absorbing surface forms an internal circulation channel in the length direction of the trough.

[0056] In yet another embodiment, Figure 4 As shown in b, the crest of the folded heat-absorbing surface 111 in the closed cavity is the trough of the folded heat-releasing surface 112 outside the closed cavity, and the heat-releasing surface 112 forms an external circulation channel in the length direction of the trough.

[0057] The depth of the trough or the height of the peak is 0.1 cm-12 cm, preferably 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 cm, to increase the contact area between the heat medium and the heat absorbing surface so as to improve the heat exchange efficiency. In one embodiment, in the heat absorbing surface 111 of the heat exchanger, the depth of each peak is the same so that each peak is in the same plane; in another embodiment, in the heat releasing surface 112 of the heat exchanger, the height of each peak is the same so that each peak is in the same plane; in another embodiment, in the heat absorbing surface 111 of the heat exchanger, the depth of each peak is the same so that each peak is in the same plane, and similarly, in the heat releasing surface 112 of the heat exchanger, the height of each peak is the same so that each peak is in the same plane.

[0058] In the heat absorption surface 111 or the heat release surface 112 of the heat exchanger, the width of each trough is the same, or the width of each crest is the same, or the width of each trough is consistent with the width of each crest; in the heat absorption surface 111 and the heat release surface 112 of the heat exchanger, the width of each trough is consistent with the width of each crest.

[0059] The lengths of the inner circulation channels are consistent, or the lengths of the outer circulation channels are consistent, or the lengths of the inner circulation channels and the lengths of the outer circulation channels are consistent.

[0060] like Figure 3~4As shown, the cross section of the corrugated plate is wavy, and the wave is a combination of at least one of regular or irregular line segments, arcs, etc. If the wave is a combination of at least one of regular line segments and arcs, the cross section of the corrugated plate is corrugated, and the material of the corrugated plate can be aluminum, copper, silver, gold, iron and alloys thereof. In one embodiment, the corrugated plate is an aluminum corrugated plate with uniform thickness, with a thickness of 0.1 to 1 mm, preferably 0.3 to 0.7 mm, which increases the heat exchange contact area, reduces the structural weight, and shortens the heat transfer distance between the heat absorbing end and the heat releasing end.

[0061] In one embodiment, if Figure 5 As shown, the heat exchanger includes a stacked arrangement of corrugated plates, so that the wave crests of the heat release surface 112 of the corrugated plate and the wave crests of the second-order heat absorption surface 1110 of the second corrugated plate are correspondingly connected and fixed to each other in the length direction of the wave crests. On the one hand, the heat is diffused from the axial direction of the outer circulation channel, and on the other hand, the second-order heat absorption surface 1110 as a solid contacts the wave crests of the heat release surface 112 and the gas in the outer circulation channel respectively, and can quickly absorb the heat from the solid and the gas along the radial direction of the outer circulation channel, and transfer it to the second-order heat release surface 1120 of the second corrugated plate for heat exchange, further increasing the heat release area.

[0062] In one embodiment, if Figure 6 As shown, the heat exchanger includes a stacked corrugated plate and a heat conducting plate, so that the heat release surface 112 of the corrugated plate is fixedly connected to the second-order heat absorption surface 1110 of the heat conducting plate in the length direction of the wave crest. On the one hand, the heat is diffused from the axial direction of the outer circulation channel, and on the other hand, the second-order heat absorption surface 1110 as a solid contacts the wave crest of the heat release surface 112 and the gas in the outer circulation channel respectively, and can quickly absorb the heat from the solid and the gas along the radial direction of the outer circulation channel, and transfer it to the second-order heat release surface 1120 of the heat conducting plate for heat exchange, further increasing the heat release area.

[0063] In one embodiment, if Figure 7 As shown, the heat exchanger includes a stacked corrugated plate and a profile radiator, so that the heat release surface 112 of the corrugated plate is fixedly connected to the second-order heat absorption surface 1110 of the profile radiator in the length direction of the wave crest. On the one hand, the heat is diffused from the axial direction of the outer circulation channel, and on the other hand, the second-order heat absorption surface 1110 as a solid contacts the wave crest of the heat release surface 112 and the gas in the outer circulation channel respectively, and can quickly absorb the heat from the solid and the gas along the radial direction of the outer circulation channel, and transfer it to the second-order heat release surface 1120 of the profile radiator for heat exchange, further increasing the heat release area.

[0064] Optionally, the effective length of the heat absorption section is measured by any of the longest heating elements, and the effective length of the heat release section is measured by the length of the heat exchanger in the long direction; if it is not a straight line, it is measured by the orthographic projection distance of its measurement method in the long direction. In the flow channel, the angle between the heat absorption section and the heat release section, and the effective length ratio of the heat release section to the heat absorption section are set as follows:

[0065] In the flow channel, the angle between the heat absorbing section A and the heat releasing section is 70°C to 180°C. Figure 1 As shown, the angle between the heat absorption section A (i.e. any plane of the heating element 41 / 42 / 43 / 44) and the first heat release section (i.e. the plane where the wave crest of the first heat exchanger 11 is located) is 90°, and the angle between the heat absorption section A (i.e. any plane of the heating element 41 / 42 / 43 / 44) and the second heat release section (i.e. the plane where the wave crest of the second heat exchanger 12 is located) is 180°. Compared with the case where the heat absorption section and the two heat release sections are connected into a linear structure, the space occupied by the flow channel in the length direction can be reduced, and the fan is installed within the angle, which can avoid the enlargement of the closed cavity. Preferably, the angle is 70°C~135°C. At 70°C~90°C, the space occupied by the flow channel in the length direction is the smallest; at 90°C, it is convenient for the installation of parts and the design of internal and external circulation air ducts.

[0066] In the flow channel, the effective length of at least one heat release section is less than or equal to the effective length of the heat absorption section, and the total effective length of the heat release section is greater than or equal to the effective length of the heat absorption section. Figure 1 As shown, the effective length of the first heat release section (i.e., the length of the first heat exchanger 11 in the long direction) is greater than the effective length of the heat absorption section A (i.e., any one of the heating elements 41 / 42 / 43 / 44), and the length of the second heat release section (i.e., the length of the second heat exchanger 12 in the long direction) is less than the effective length of the heat absorption section A (i.e., any one of the heating elements 41 / 42 / 43 / 44), but the total effective length of the two heat release sections is greater than the effective length of the heat absorption section. If a single heat release section is too long, the enclosed cavity will become larger to accommodate it, and the heat absorption end and the heat release end will be too far apart, resulting in low heat exchange efficiency; while this embodiment is divided into multiple heat release sections and compactly arranged in an empty position, while shortening the heat transfer distance between the heat absorption end and the heat release end, which not only reduces the volume of the enclosed cavity, but also improves the heat dissipation effect.

[0067] In one embodiment, in the flow channel, the angle between the heat absorbing section and the heat releasing section is 70°C to 180°C, and the effective length of at least one heat releasing section is less than or equal to the effective length of the heat absorbing section, and the total effective length of the heat releasing section is greater than or equal to the effective length of the heat absorbing section. Combining the description of the first two embodiments, it can be seen that this structure not only greatly reduces the occupied space, but also improves the heat dissipation effect.

[0068] Optionally, the connection position relationship between the two surfaces of the heating element, the first flow channel 31, and the second flow channel 32 is set as follows:

[0069] like Figure 1 As shown in or 12, the flow channel includes a first flow channel 31 and a second flow channel 32 which are stacked, so that two surfaces of at least one heating element are respectively circulated with the heat absorption section of the first flow channel 31 and the heat absorption section of the second flow channel 32, and the heat release section of the first flow channel 31 is connected with the heat release section of the second flow channel 32, and the heat absorption section of the first flow channel 31 is connected with the heat absorption section of the second flow channel 32.

[0070] In one embodiment, if Figure 1~2 As shown (the second heat exchanger 12 and the second fan 22 are omitted), the fan drives the heat medium to circulate in the first flow channel 31 and the second flow channel 32 in a clockwise direction. Specifically, the heat medium is sucked into the heat release section of the first flow channel 31 from the internal circulation channel of the first heat exchanger 11 by the first fan 21, and then flows through the heat absorption section of the first flow channel 31, the heat absorption section and the heat release section of the second flow channel 32, and the internal circulation channel of the first heat exchanger 11 in sequence, and is sucked into the heat release section of the first flow channel 31 by the first fan 21, forming a cycle. In some embodiments, at least one of the second heat exchanger 12 and the second fan 22 is also present.

[0071] In another embodiment, if Fig.12 As shown, the fan drives the heat medium to circulate in the first flow channel 31 and the second flow channel 32 in a counterclockwise direction. Specifically, the heat medium is drawn into the inner circulation channel of the first heat exchanger 11 from the heat release section of the first flow channel 31 by the first fan 21, and then flows through the heat release section and the heat absorption section of the second flow channel 32, the heat absorption section and the heat release section of the first flow channel 31 in sequence, and is drawn into the inner circulation channel of the first heat exchanger 11 by the first fan 21 to form a cycle.

[0072] like Fig.11As shown (the structure of the second flow channel 32 is not shown), the flow channel includes a first flow channel 31 and a second flow channel 32 which are stacked so that both surfaces of at least one heating element are in communication with the heat absorption section of the first flow channel 31, and the heat release section of the first flow channel 31 is connected to the heat release section of the second flow channel 32, and the heat absorption section of the first flow channel 31 is connected to the heat absorption section of the second flow channel 32. The heat absorption section of the second flow channel 32 is the area where the reflective cup 510 is located, and the heat release section is the remaining flow channel area. The fan drives the heat medium to circulate clockwise in the first flow channel 31 and the second flow channel 32. Specifically, the heat medium is sucked into the heat release section of the first flow channel 31 from the internal circulation channel of the first heat exchanger 11 by the first fan 21, and flows through the two surfaces of the heating element in the same direction when flowing through the heat absorption section of the first flow channel 31. After merging, it flows through the internal circulation channel of the second heat exchanger 12, and continues to be drawn into the heat absorption section of the second flow channel 32 by the second fan 22, and then flows through the heat release section of the second flow channel 32 and the internal circulation channel of the first heat exchanger 11 in sequence, and is sucked into the heat release section of the first flow channel 31 by the first fan 21, forming a cycle. In some embodiments, at least one of the second heat exchanger 12 and the second fan 22 is omitted.

[0073] Optional, such as Figure 1~2 As shown, the heat exchanger includes a first heat exchanger 11 and a second heat exchanger 12. The first flow channel 31 and the second flow channel 32 are both provided with two heat release sections and are respectively extended at both ends of their heat absorption sections. The first heat exchanger 11 and the second heat exchanger 12 are respectively arranged in the two heat release sections.

[0074] In one embodiment, if Figure 1~2 As shown (the second fan 22 is omitted), the fan drives the heat medium to circulate in the first flow channel 31 and the second flow channel 32 in a clockwise direction. Specifically, the heat medium is sucked into the heat release section of the first flow channel 31 from the internal circulation channel of the first heat exchanger 11 by the first fan 21, and then flows through the heat absorption section of the first flow channel 31, the internal circulation channel of the second heat exchanger 12, the heat absorption section and the heat release section of the second flow channel 32, and the internal circulation channel of the first heat exchanger 11 in sequence, and is sucked into the heat release section of the first flow channel 31 by the first fan 21, forming a cycle. In some embodiments, there is also a second fan 22.

[0075] Optionally, the fan includes a first fan 21 and a second fan 22, the first fan 21 draws or blows air into the inner circulation channel of the first heat exchanger 11, and the second fan 22 draws or blows air into the inner circulation channel of the second heat exchanger 12, and the drawing or blowing is used to control the fluid to circulate in a clockwise or counterclockwise direction.

[0076] like Figure 1~2As shown, the fan draws air into the inner circulation channel, driving the heat medium to circulate in the first flow channel 31 and the second flow channel 32 in a clockwise direction. Specifically, the heat medium is sucked into the heat release section of the first flow channel 31 from the inner circulation channel of the first heat exchanger 11 by the first fan 21, and flows through the heat absorption section of the first flow channel 31 and the inner circulation channel of the second heat exchanger 12 in sequence. The second fan 22 continues to suck the heat medium from the inner circulation channel of the second heat exchanger 12 into the heat absorption section and its heat release section of the second flow channel 32, and the inner circulation channel of the first heat exchanger 11, and is sucked into the heat release section of the first flow channel 31 by the fan, forming a cycle.

[0077] Optional, such as Fig. 9 As shown (the structure of the third flow channel is not shown), the closed cavity is also provided with a reflective cup 510, and the first heat release section of the second flow channel 32 branches out of the third flow channel, and the third flow channel first surrounds the reflective cup 510 to absorb heat and then merges into the second heat release section of the second flow channel 32. Among them, the heat absorption section of the second flow channel 32 is the area where the reflective cup 510 is located, and the heat release section is the remaining flow channel area. The fan drives the heat medium to circulate clockwise in the first flow channel 31, the second flow channel 32, and the third flow channel. Specifically, the heat medium is sucked into the heat release section of the first flow channel 31 from the internal circulation channel of the first heat exchanger 11 by the first fan 21, and flows through the heat absorption section of the first flow channel 31 and the internal circulation channel of the second heat exchanger 12 in sequence. The second fan 22 continues to circulate from the second heat exchanger 11. The inner circulation channel of 2 draws the heat medium into the first heat release section of the second flow channel 32, a part of it flows through the heat absorption section of the second flow channel 32 and its second heat release section, and the other part flows through the first heat release section of the third flow channel, and then flows through the second heat release section of the third flow channel after absorbing heat in the heat absorption section of the third flow channel around the reflective cup 510. After the third flow channel merges with the second flow channel 32, it flows into the inner circulation channel of the first heat exchanger 11 and is sucked into the heat release section of the first flow channel 31 by the fan, forming a cycle.

[0078] In a second aspect, an electronic device is provided, comprising the heat dissipation structure of any one of the first aspects. The electronic device may be a mobile phone, computer or other intelligent terminal with waterproof requirements, or a lighting device with dustproof requirements such as a lighting fixture, stage lighting fixture, optical machine, projector, printer, scanner, photolithography machine or the like.

[0079] Thirdly, Figure 1~2 As shown in 10, a projector is provided, including a shell 9, the shell 9 is provided with a third fan 23, a tubular radiator 6, a third ventilation hole 73 and a sealed optical machine, the optical machine includes a light source 51, a reflective cup 510, an optical path cavity 92, a light output lens module 45 and the heat dissipation structure of any one of the first aspects, and the light source 51 is connected to the tubular radiator 6 by heat conduction.

[0080] like Fig.10As shown, the light source 51, the reflective cup 510, the heat absorbing section, the optical path cavity 92, and the light output lens module 45 are arranged in sequence along the light output direction. The heating element includes a light valve 42. As the electrical energy is converted into thermal energy, the temperature of the closed cavity will rise. Each heat absorbing section allows light to pass through, and the thermal radiation of the light source 51 will also cause the temperature of each heat absorbing section to rise. Each heat releasing section avoids the optical path area.

[0081] In one embodiment, if Figure 1 As shown, the heating element includes a first Fresnel lens 41, an LCD light valve 42, a heat-insulating glass 43, and a second Fresnel lens 44. The second Fresnel lens 44, the heat-insulating glass 43, the LCD light valve 42, and the first Fresnel lens 41 are sequentially arranged along the light emitting direction, so that the second flow channel 32 is divided into an upper branch formed by the LCD light valve 42 and the heat-insulating glass 43 and a lower branch formed by the heat-insulating glass 43 and the second Fresnel lens 44. The first Fresnel lens 41, the light valve 42, the heat-insulating glass 43, and the second Fresnel lens 44 surround The heat absorbing section of the first flow channel 31 and the second flow channel 32 is such that one surface of the first Fresnel lens 41 is interconnected with the heat absorbing section of the first flow channel 31, two surfaces of the light valve 42 are respectively interconnected with the heat absorbing section of the first flow channel 31 and the heat absorbing section of the second flow channel 32, two surfaces of the heat insulating glass 43 are respectively interconnected with the upper branch and the lower branch of the second flow channel 32, one surface of the second Fresnel lens 44 is interconnected with the lower branch, and the second Fresnel lens 44 and the reflective cup 510 form a closed space to meet the requirements of optical functions, while reducing the heat transfer of the light source 51 to the outside. The heat radiated from the light source 51 to each heating element enters the respective heat releasing section along the flow channel, and is cooled on the heat absorbing surface of each heat exchanger.

[0082] like Fig.10 As shown, the third fan 23 drives the airflow to pass through the light-emitting lens module 45, the heat-releasing surface of the first heat exchanger 11, the air inlet and the air outlet of the third fan 23, the air inlet and the air outlet of the tubular radiator 6, and the third ventilation hole 73 in sequence, so as to discharge the heat of the light-emitting lens module 45, the heat dissipation structure and the light source 51 out of the housing, wherein the first heat exchanger 11 simultaneously exchanges heat with airflows in opposite directions on the heat-absorbing surface 111 and the heat-releasing surface 112. In one embodiment, the first heat exchanger 11 participates in the internal circulation heat exchange on the heat-absorbing surface 111 and participates in the external circulation heat exchange on the heat-releasing surface 112, and the airflows in opposite directions promote the heat exchange effects between the two.

[0083] In one embodiment, the tubular radiator 6 is provided with a first heat pipe 611 and a first fin 621; in another embodiment, the tubular radiator 6 is provided with a second heat pipe 612 and a second fin 622; in yet another embodiment, the tubular radiator 6 is provided with a first heat pipe 611, a first fin 621, a second heat pipe 612 and a second fin 622.

[0084] Optionally, the projector also includes a fourth fan and a fourth ventilation hole.

[0085] like Fig.10 As shown, the fourth fan 24 drives the airflow to sequentially pass through the light output lens module 45, the heat release surface 112 of the second heat exchanger 12, the air inlet and air outlet of the fourth fan 24, the air inlet and air outlet of the tubular radiator 6, and the fourth ventilation hole 74, so as to discharge the heat of the light output lens module 45, the heat dissipation structure and the light source 51 out of the shell, wherein the second heat exchanger 12 simultaneously exchanges heat at the heat absorption surface 111 and the heat release surface 112 with airflow in the same direction.

[0086] In one embodiment, if Fig.10 As shown, the projector further includes a first ventilation hole 71, a second ventilation hole 72, a speaker 25 and a power module 52. The heat of the speaker 25 diffuses to the second ventilation hole 72 or is incorporated into the external circulation duct driven by the fourth fan 24 for heat exchange. The second ventilation hole 72 facilitates the transmission of the sound of the speaker 25, and at the same time facilitates the airflow to be sucked in from the second ventilation hole 72 to balance the internal and external air pressures of the housing 9, and promote the external circulation duct driven by the third fan 23 and the fourth fan 24 for heat exchange; the external circulation heat exchange driven by the fourth fan 24 generates negative pressure, which can promote the airflow to enter from the first ventilation hole 71, and then the airflow flows through the power module 52 and absorbs heat, and is incorporated into the external circulation duct driven by the fourth fan 24 for heat exchange, and finally discharged from the housing 9.

[0087] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A heat dissipation structure having a closed cavity filled with a heat medium, characterized in that: The sealed cavity is provided with at least one heat exchanger, at least one fan, at least one flow channel and at least one heating element; The flow channel is provided with at least one heat absorbing section and at least one heat releasing section; The heat exchanger comprises a corrugated plate having a heat absorbing surface and a heat releasing surface, wherein the heat absorbing surface is located in a closed cavity and in a heat releasing section of the flow channel, and the heat releasing surface is located outside the closed cavity; The fan is located in the heat release section of the flow channel, so as to force the heat medium to convect on the heat absorption surface and the heat release section and heat absorption section of the flow channel, so as to improve the circulation efficiency of the heat medium in the closed cavity; The heating element is arranged at the heat absorbing section of the flow channel, and the heat medium can flow between at least one surface of the heating element and the heat absorbing section of the flow channel.

2. The heat dissipation structure according to claim 1, characterized in that: The corrugated plate is configured as follows: The crest of the folded heat-absorbing surface in the closed cavity is the trough of the folded heat-releasing surface outside the closed cavity, and the heat-releasing surface forms an external circulation channel in the length direction of the trough; and / or The trough formed by the folds of the heat absorbing surface in the closed cavity is the peak formed by the folds of the heat releasing surface outside the closed cavity, and the heat absorbing surface forms an internal circulation channel in the length direction of the trough.

3. The heat dissipation structure according to claim 2, characterized in that: The heat exchanger comprises stacked corrugated plates, so that the wave crests of the heat release surface of the corrugated plates are correspondingly connected with the wave crests of the second-order heat absorption surface of the second corrugated plate in the length direction of the wave crests.

4. The heat dissipation structure according to claim 1, characterized in that: In the flow channel, the angle between the heat absorption section and the heat release section is 70°C~180°C, and / or the effective length of at least one section of the heat release section is less than or equal to the effective length of the heat absorption section and the total effective length of the heat release section is greater than or equal to the effective length of the heat absorption section.

5. The heat dissipation structure according to claim 1, characterized in that: The flow channel includes a first flow channel and a second flow channel arranged in a stacked manner, so that the two surfaces of at least one heating element are respectively circulated with the heat absorption section of the first flow channel and the heat absorption section of the second flow channel, or the two surfaces of at least one heating element are circulated with the heat absorption section of the first flow channel, and the heat release section of the first flow channel is connected to the heat release section of the second flow channel, and the heat absorption section of the first flow channel is connected to the heat absorption section of the second flow channel.

6. The heat dissipation structure according to claim 5, characterized in that: The heat exchanger includes a first heat exchanger and a second heat exchanger. The first flow channel and the second flow channel are both provided with two heat release sections and are respectively extended at both ends of the heat absorption section. The first heat exchanger and the second heat exchanger are respectively arranged in the two heat release sections.

7. The heat dissipation structure according to claim 6, characterized in that: The closed cavity is also provided with a reflective cup. The first heat release section of the second flow channel branches out into the third flow channel. The third flow channel first surrounds the reflective cup to absorb heat and then merges into the second heat release section of the second flow channel.

8. An electronic device, characterized in that: It comprises the heat dissipation structure according to any one of claims 1 to 7.

9. A projector, comprising a housing, characterized in that: The housing is provided with a third fan, a tubular radiator, a third ventilation hole and a sealed optical machine, the optical machine comprises a light source, a reflective cup, an optical path cavity, a light output lens module and the heat dissipation structure according to any one of claims 6 to 7, and the light source is connected to the tubular radiator by heat conduction; The light source, the reflective cup, the heat absorbing section, the optical path cavity, and the light output lens module are sequentially arranged along the light output direction. The heating element includes a light valve. Each heat absorbing section allows light to pass through, and each heat releasing section avoids the optical path area. The third fan drives the airflow to sequentially pass through the light-emitting lens module, the heat-releasing surface of the first heat exchanger, the air inlet and air outlet of the third fan, the air inlet and air outlet of the tubular radiator, and the third ventilation hole, so as to discharge the heat of the light-emitting lens module, the heat dissipation structure and the light source out of the shell, wherein the first heat exchanger simultaneously exchanges heat on the heat-releasing surface and the heat-absorbing surface with airflows in opposite directions.

10. The projector according to claim 9, characterized in that: The projector further includes a fourth fan and a fourth ventilation hole; The fourth fan drives the airflow to pass through the light-emitting lens module, the heat-releasing surface of the second heat exchanger, the air inlet and air outlet of the fourth fan, the air inlet and air outlet of the tubular radiator, and the fourth ventilation hole in sequence, so as to discharge the heat of the light-emitting lens module, the heat dissipation structure and the light source out of the shell, wherein the second heat exchanger simultaneously exchanges heat on the heat-releasing surface and the heat-absorbing surface with airflow in the same direction.

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