Passive heat dissipation system and method for animal and plant lighting device

Abstract

The invention relates to a passive heat dissipation system of an animal and plant lighting device. The passive heat dissipation system comprises a light-emitting part. The light-emitting part is arranged in the heat exchange supporting frame in an embedded mode. At least one gas flow channel used for transferring heat inside and outside the heat exchange supporting frame is arranged in the heat exchange wall, making contact with the external space, of the heat exchange supporting frame, and the gas flow channel extends in the height direction of the heat exchange supporting frame so that airflow can flow from the light-emitting part to the top or the outside of the heat exchange supporting frame. The gas flow channel is provided with a plurality of branch flow channels of a roundabout structure along the two sides of the path of the main flow channel, and therefore gas flow flowing towards the light-emitting part in the gas flow channel is reduced. The problems that in the prior art, due to non-directional air flow, heat generated by the light-emitting part cannot be taken away by air flow, heat of the light-emitting part cannot be dissipated completely, and the service life of the light-emitting part is shortened are solved.

Description

Technical Field

[0001] The present invention relates to the field of heat dissipation technology, and in particular to a passive heat dissipation system and method for an animal and plant lighting device. Background Art

[0002] Plant factory is an advanced stage of modern facility agriculture development. It is a high-investment, high-tech, and finely equipped production system. This factory-based agricultural system integrates biotechnology, engineering technology, and system management, which frees agricultural production from the constraints of natural ecology and produces plant products on a planned annual basis. It is one of the most dynamic and potential fields for absorbing and applying high-tech achievements in the process of agricultural industrialization. It represents the future development direction of agriculture and requires a large number of lighting devices for animals and plants. Existing lighting devices often use LED light sources, but because animals and plants need long-term illumination to ensure their light exposure time, LED light sources need to work for a long time, which generates a large amount of heat energy accumulation, resulting in the burning of LED light sources. The existing technology often uses air cooling or water cooling for heat dissipation, but this heat dissipation method consumes a lot of resources, requires the addition of a variety of power-consuming facilities, and installs each lighting device in the plant factory, which requires too much cost. Therefore, how to dissipate heat efficiently and at low cost for lighting devices is an urgent problem to be solved.

[0003] CN 111520652A discloses an LED lamp, comprising: a lamp housing, the lamp housing comprising a lamp holder, a lamp neck and an inner sleeve, the lamp holder being connected to the lamp neck, and the lamp neck being connected to the inner sleeve; a passive heat exchange support frame, the passive heat exchange support frame comprising a radiator, the radiator comprising heat dissipation fins and a heat dissipation base, and the radiator being connected to the lamp housing; a power supply, the power supply comprising a first part and a second part, the first part being arranged in the lamp neck and the lamp holder, and the second part being arranged in the radiator; a lamp board connected to the radiator; an outer contour of a side surface of the LED lamp is formed by rotating 360 degrees around the axis of the LED lamp with a contour line to form the outer contour of the LED lamp, the outer contour includes the outer contour of the lamp neck and the outer contour of the radiator, the outer contour of the lamp neck is a concave curve, the contour of the radiator is a convex curve, and the curvature radius of the lamp neck contour is greater than the curvature radius of the radiator contour. This patent forms a first heat dissipation channel and a second heat dissipation channel by setting the radius of curvature of the outer contour, but the first heat dissipation channel and the second heat dissipation channel both dissipate heat through air flow. However, the flow of gas in the above-mentioned channels does not have a setting to accelerate the forward flow and / or reduce the reverse flow, resulting in a slower airflow and an inability to quickly take away the heat, thereby causing heat accumulation.

[0004] CN102667333A discloses a lamp including a solid-state light emitter, which is an A lamp and provides a wall socket efficiency of at least 90 lumens per watt. The patent also provides a lamp including a solid-state light emitter and a power supply, the emitter is mounted on a heat sink, and the heat sink is separated from the power supply. A lamp including a solid-state light emitter and a heat sink is also disclosed, the heat sink having a heat dissipation chamber, wherein an ambient medium can enter the chamber, pass through the chamber and flow out. The patent also provides a lamp including a light-transmitting housing, at least one solid-state light emitter and a first heat sink. A lamp including a heat sink is also disclosed, the heat sink including a heat dissipation chamber. The patent also relates to a lamp including a first and a second heat sink. The patent also relates to a lamp including a device for causing an ambient fluid to flow. Similar to the above patents, this patent also does not have a device for promoting and / or hindering the flow of an ambient fluid, which will lead to uneven heat dissipation and thus affect the heat dissipation efficiency.

[0005] In addition, on the one hand, there are differences in understanding among those skilled in the art; on the other hand, the inventor studied a large number of documents and patents when making the present invention, but due to space limitations, not all details and contents are listed in detail. However, this does not mean that the present invention does not have the characteristics of these prior arts. On the contrary, the present invention already has all the characteristics of the prior art, and the applicant reserves the right to add relevant prior art to the background technology. Summary of the invention

[0006] Plant growth is extremely sensitive to the distribution of ambient temperature, which also makes the lighting equipment installed on the top of the plant closely related to plant growth.

[0007] When the light temperature at the top (or local) of the plant is too high, the plant will close its stomata to reduce water loss, resulting in a decrease in the ability of the plant's roots to absorb water. This behavior affects the plant's water balance and absorption, which may lead to dehydration or poor growth. At the same time, high temperatures may also trigger physiological stress responses in plants, such as the production of stress hormones (such as abscisic acid), which inhibit flower bud differentiation and fruit development. Affected by the spatial distribution and the plant's demand for light energy, the light source at the top of the plant in the plant factory is very close to the top of the plant and is turned on for a long time, resulting in a certain temperature difference between the top and bottom of the plant.

[0008] In order to improve the heat dissipation effect of the lamp, the prior art attempts to improve the heat exchange effect by setting a guide cavity with a relative heat exchange flow direction at the top of the lamp. For example, the patent document with publication number CN104235796A discloses a wide-angle luminous LED fluorescent lamp with a built-in two-way convection radiator, including a radiator arranged in the tubular soft light cover, the radiator including a central heat dissipation ridge distributed along the length direction of the tubular soft light cover and located in the center of the radiator, the two sides of the central heat dissipation ridge respectively constitute a guide cavity, the two ends of the tubular soft light cover are provided with lamp cap covers, the bottom of each lamp cap cover is provided with an air inlet, and the top of each lamp cap cover is provided with an air outlet. The technical solution uses a radiator built into the tubular diffuser to divide the tubular diffuser into two working chambers, and the diversion chamber and the air inlet and outlet holes in the lamp cap covers at both ends jointly form a diversion channel, so that the chimney effect is obvious during use, thereby improving the diversion and heat dissipation effect; at the same time, the wind flow directions in the diversion chambers on both sides of the central heat dissipation ridge set in the technical solution are opposite, thereby forming a two-way convection, so that the overall heat dissipation of the radiator is uniform, avoiding the situation in which the temperature at one end of the LED fluorescent lamp in the prior art is higher. However, although the diversion chamber structure set in the technical solution can increase the heat exchange area during air convection, it also increases the resistance generated during convection, thereby reducing the heat exchange air flow rate, so that the heat dissipation efficiency can only be improved by increasing the diversion chamber structure. In particular, as a lamp specifically used in a plant factory, its heat exchange occurs near the lamp, aiming to evenly distribute the heat around the light source rather than taking it away, which does not fundamentally solve the problem that the heat of the densely distributed and long-term turned-on lamps increases the ambient temperature of the lamps.

[0009] On the contrary, the gas flow channel of the present invention only runs a one-way air flow, and can accelerate the flow speed of the airflow passing through the gas flow channel, so as to improve the overall heat dissipation efficiency, which is completely different from the heat dissipation control logic of the above-mentioned prior art. In addition, based on the needs of plant cultivation, the present invention optimizes the arrangement of heat exchange from the perspective of plant growth and development, so that the airflow in the flow channel can carry heat and be collected, instead of evenly distributing the heat accumulated in the light source accessories around.

[0010] Furthermore, the heat exchange process of the heat exchange airflow in this technical solution is mainly concentrated in the horizontal flow stage. The temperature of the gas entering the guide cavity gradually increases, resulting in a higher temperature when it flows close to the outlet end, and a stable and uniform heat dissipation effect cannot be achieved.

[0011] In view of the shortcomings of the prior art, the present invention provides a lighting device for regulating the temperature of the top of a plant. The lighting device includes a heat exchange support frame and a light-emitting component embedded in the heat exchange support frame. At least one gas flow channel for transferring heat inside and outside the heat exchange support frame is arranged inside a heat exchange wall of the heat exchange support frame in contact with the external space.

[0012] The present invention also provides a heat dissipation device for regulating the temperature of the plant top, the heat dissipation device comprising a heat exchange support frame, wherein a heat exchange wall of the heat exchange support frame in contact with the external space is provided with at least one gas flow channel for transferring heat inside and outside the heat exchange support frame.

[0013] The present invention also provides a passive heat dissipation system for an animal and plant lighting device, which includes a light-emitting component. The light-emitting component is embedded in a heat exchange support frame. A heat exchange wall of the heat exchange support frame in contact with the external space is provided with at least one gas flow channel for transferring heat inside and outside the heat exchange support frame, and the gas flow channel extends along the height direction of the heat exchange support frame, so that the airflow flows from the direction of the light-emitting component to the top or outside of the heat exchange support frame, wherein a plurality of branch flow channels of an island structure are provided on both sides of the path of the gas flow channel along the main flow channel, thereby reducing the airflow flowing in the gas flow channel toward the light-emitting component.

[0014] According to a preferred embodiment, the gas flow channel includes a plurality of first branch flow channels and a plurality of second branch flow channels distributed on both sides of the gas flow channel with the main flow channel as the central axis, and the plurality of first branch flow channels and the plurality of second branch flow channels are arranged in a staggered manner. Preferably, the plurality of first branch flow channels and the plurality of second branch flow channels can accelerate the forward airflow flowing from the light-emitting element to the top or the outside of the heat exchange support frame in the gas flow channel. The plurality of first branch flow channels and the plurality of second branch flow channels can reduce the reverse airflow flowing from the top or the outside of the heat exchange support frame to the light-emitting element in the gas flow channel.

[0015] Unlike the prior art, the present invention is capable of setting branch flow channels in the direction away from the light-emitting component. Based on the above-mentioned distinguishing technical features, the problems to be solved by the present invention may include: how to increase the flow rate of the heat dissipation airflow of the lighting device to improve its heat dissipation efficiency. Specifically, the first branch flow channel and the second branch flow channel of the present invention block the airflow in the gas flow channel to perform pressure zone diversion, so that the forward airflow flowing from the direction of the light-emitting component to the top or outside of the heat exchange support frame is accelerated, and the reverse airflow flowing from the top or outside of the heat exchange support frame to the direction of the light-emitting component is reduced, thereby forming airflow convection to carry away the heat emitted by the light-emitting component by the continuous airflow convection, thereby preventing the problem in the prior art that the heat generated by the light-emitting component cannot be carried away by the airflow due to the non-directional air flow, causing the light-emitting component to be unable to completely dissipate heat, thereby causing the service life of the light-emitting component to be reduced.

[0016] According to a preferred embodiment, the shapes of several first branch flow channels and second branch flow channels are set to: have a first slope along the flow direction of the airflow and accelerate the airflow and a second slope connected to the first slope to reduce the reverse airflow during the transfer process. The first slope is a straight branch flow channel with a fixed angle that deviates from the gas flow channel. The second slope is a curved branch flow channel with an annular feature and directs the airflow in the opposite direction. The first slope of the present invention is a straight branch flow channel with a fixed angle that deviates from the gas flow channel, and the second slope is a curved branch flow channel with an annular feature and directs the airflow in the opposite direction. The straight branch flow channel and the curved branch flow channel divide the flow path of the gas into multiple pressure zones, and the thrust is generated by the change of the pressure difference to increase the flow rate of the gas. The selection of the first slope angle is maintained between 15° and 45°. Too large or too small an angle will cause different inlet and outlet pressure drops when the airflow enters it, which will cause the airflow to be unable to flow stably. Preferably, several first branch flow channels and second branch flow channels have the same shape and are mirror-imaged.

[0017] According to a preferred embodiment, the working process of several first branch flow channels and second branch flow channels is as follows: when the forward airflow passes through the first branch flow channel and / or the second branch flow channel, the forward airflow is divided into the main airflow and the branch airflow. The main airflow maintains the flow direction of the airflow. The branch airflow is redirected by the first branch flow channel and / or the second branch flow channel, passes through the second slope and the first slope in sequence and merges with the main airflow to accelerate the main airflow. When the reverse airflow passes through the first branch flow channel and / or the second branch flow channel, the reverse airflow is divided into the main airflow and the branch airflow. Since the branch airflow passes through the first slope and the second slope in sequence, the branch airflow loses kinetic energy under the action of the pressure gradient of the first slope and the second slope, and the branch airflow is directed back to the main airflow to form a vortex for reduction. The combination of several first branch flow channels and second branch flow channels is connected so that the reverse airflow does not enter the gas flow channel. The first slope and the second slope of the present invention divide the gas flow channel into multiple pressure zones. During the flow of the forward airflow, the gas first expands and then compresses at the second slope and the first slope, thereby accelerating the main airflow. The separation of multiple pressure zones increases the flow rate of the branch airflow during the flow of the reverse airflow, thereby making the vortex at the intersection with the main airflow larger to hinder the passage of the reverse airflow.

[0018] According to a preferred embodiment, the gas flow channel is divided into a first flow channel section on one side of the light-emitting element and used for introducing the airflow, a second flow channel section connected to one end of the first flow channel section in the direction of the airflow flow and used for accelerating the transmission of the positive airflow, and a third flow channel section connected to one end of the second flow channel section in the direction of the airflow flow. The direction in which the opening side of the first flow channel section points to the light-emitting element is the second direction. The extension surfaces of the first direction and the second direction intersect with each other. The first flow channel section, the second flow channel section and the third flow channel section smoothly transition from the first direction to the second direction to form an arc-shaped gas flow channel to change the flow direction of the airflow. Different from the prior art, the gas flow channel of the present invention can form a flow channel distribution with an inclined angle above the light-emitting element.

[0019] Based on the above-mentioned distinguishing technical features, the problems to be solved by the present invention may include: how to prevent the high temperature environment near the light-emitting component from affecting the air intake temperature of the gas flow channel, thereby reducing the heat dissipation efficiency. Specifically, the first flow channel section, the second flow channel section and the third flow channel section form an arc-shaped gas flow channel. On the one hand, such a design makes the air inlet an inclined opening. The air inlet is an inclined opening, rather than a vertical downward opening, which makes the air flow in easier and is conducive to the formation of air convection. On the other hand, it can also increase the distance between the air inlet and the light-emitting component. This design makes the air temperature near the air inlet lower than the air temperature near the light-emitting component, thereby making the initial air intake temperature lower to improve the heat dissipation efficiency.

[0020] The technical solution also includes improving the flow direction of the internal airflow. Preferably, the obliquely entering airflow is converted into a vertical airflow. The change in the airflow direction can accelerate the formation of convection, and the arc-shaped gas flow channel can increase the pressure on the airflow, increase its flow rate, and thus increase the heat dissipation efficiency.

[0021] According to a preferred embodiment, the branch flow channel is placed in the second flow channel section. The cross-sectional area of ​​the second flow channel section in the first direction decreases as the flow path of the gas flow increases along the first direction. Unlike the prior art, the gas flow channel of the present invention can be configured to reduce the cross-sectional area of ​​the gas flow channel in the first direction as the gas flow increases. Based on the above-mentioned distinguishing technical features, the problems to be solved by the present invention may include: how to increase the flow rate at the outlet end of the heat dissipation airflow to further improve the heat dissipation efficiency of the branch flow channel. Specifically, according to the Bernoulli equation, when the flow rate of the airflow is maintained at a constant value, the smaller the cross-sectional area passed by the airflow, the greater the pressure, that is, the greater the flow rate.

[0022] According to a preferred embodiment, the cross section of the third flow channel section in the first direction is matched with the minimum cross section of the second flow channel section in the first direction. The matched cross sections reduce the resistance of the airflow. After the airflow passes through the branch flow channel in the second flow channel section, it is connected to the outside world in the third flow channel section, thereby performing heat exchange.

[0023] According to a preferred embodiment, a plurality of gas flow channels are arranged on the outer layer of the heat exchange support frame. A gap space is provided between two adjacent gas flow channels and is filled with a plurality of heat dissipation ridges. The heat dissipation ridge is connected to the light-emitting element and is used to transfer the heat energy of the light-emitting element. The airflow in the plurality of gas flow channels takes away the heat energy of the heat dissipation ridge. The circulating convection of the airflow transfers the heat in the heat dissipation ridge. The plurality of heat dissipation ridges also support the heat exchange support frame, thereby supporting the gas flow channels. The heat dissipation ridge can be selected to be made of metal or plastic. Metal materials dissipate heat quickly, but are too heavy and costly. The heat dissipation effect of plastic materials is not as good as that of metal materials, but the cost is cheap.

[0024] According to a preferred embodiment, the heat exchange support frame also includes a plurality of heat sinks arranged in an inner tower structure. The plurality of heat sinks are stacked at intervals along the first direction and connected to the heat sink ridge. The plurality of heat sink ridges form a bracket of the inner tower structure. The plurality of heat sink ridges conduct heat of the light-emitting element and are provided with a plurality of heat sinks, so that a large amount of heat energy emitted by the light-emitting element is transferred to the heat sink through the heat sink ridges, thereby improving the heat dissipation efficiency and the utilization rate of the heat sink, ensuring the long-term operation of the light-emitting element, avoiding the light-emitting element from being overheated and burned and thereby causing the delay of plant growth, thereby improving the service life of the light-emitting element. In addition, the gas flow channel provided in the present invention can further accelerate the heat transfer between the heat sink ridge and the heat sink, thereby improving the heat dissipation efficiency. Through the above-mentioned arrangement, the gas with a lower temperature entering the gas flow channel at the initial stage can exchange heat with the heat sink with a higher temperature in the inner tower structure close to the light-emitting element, thereby enabling the heat on the heat sink with a higher temperature to always be in contact with the gas with a lower temperature for heat exchange, thereby improving its heat dissipation efficiency.

[0025] The present invention also relates to a passive heat dissipation method for an animal and plant lighting device, the method comprising designing a flow path including an air flow passing through a main channel path, a plurality of first branch channel paths and a plurality of second branch channel paths, wherein when a positive airflow passes through the path of the first branch channel and / or the path of the second branch channel, the positive airflow is divided into a main airflow and a branch airflow, the main airflow maintains the airflow direction, the branch airflow is redirected by the first branch channel and / or the second branch channel, and then merges with the main airflow to accelerate the main airflow.

[0026] Beneficial technical effects of the present invention:

[0027] (1) The first branch flow channel and the second branch flow channel of the present invention block the airflow in the gas flow channel to divide the airflow into pressure zones, so that the airflow along the first direction is accelerated and the airflow in the opposite direction of the first direction is reduced, thereby forming airflow convection, so that the heat emitted by the light-emitting component is carried away by the continuous airflow convection, thereby preventing the problem in the prior art that the heat generated by the light-emitting component cannot be carried away by the airflow due to the non-directional air flow, causing the light-emitting component to be unable to completely dissipate heat, thereby causing the service life of the light-emitting component to be reduced;

[0028] (2) The first slope of the present invention is a straight flow channel with a fixed angle that deviates from the gas flow channel, and the second slope is a curved flow channel with an annular feature that guides the gas flow in the opposite direction. The straight flow channel and the curved flow channel divide the gas flow path into multiple pressure zones, and the thrust is generated by the change of pressure difference to increase the flow rate of the gas;

[0029] (3) The first slope and the second slope of the present invention divide the gas flow channel into multiple pressure zones. During the flow of the forward airflow, the gas is first expanded and then compressed at the second slope and the first slope, thereby accelerating the main airflow. The separation of multiple pressure zones increases the flow rate of the branch airflow during the flow of the reverse airflow, thereby increasing the vortex at the intersection with the main airflow to hinder the passage of the reverse airflow.

[0030] (4) The first flow channel section, the second flow channel section and the third flow channel section form an arc-shaped gas flow channel. This design makes the air inlet an inclined opening rather than a vertical downward opening, making it easier for the airflow to flow in and facilitating the formation of air convection. This design can also improve the flow direction of the internal airflow, converting the oblique airflow into a vertical airflow, accelerating the formation of convection, and the arc-shaped gas flow channel can increase the pressure on the airflow, increase its flow rate, and thus increase the heat dissipation efficiency;

[0031] (5) Several heat dissipation ridges form the support of the inner tower structure. Several heat dissipation ridges conduct heat of the light-emitting component and several heat sinks are provided, so that a large amount of heat energy emitted by the light-emitting component is transferred to the heat sink through the heat dissipation ridges, thereby improving the heat dissipation efficiency and the utilization rate of the heat sink, ensuring the long-term operation of the light-emitting component, avoiding the light-emitting component from being overheated and burned, thereby delaying the growth of plants, and improving the service life of the light-emitting component. In addition, the gas flow channel provided in the present invention can further accelerate the heat transfer between the heat dissipation ridges and the heat sink, thereby improving the heat dissipation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a cross-sectional schematic diagram of a preferred embodiment of a passive heat dissipation system for an animal and plant lighting device of the present invention;

[0033] Figure 2 It is a schematic diagram of the axial structure of a preferred embodiment of a passive heat dissipation system of an animal and plant lighting device of the present invention;

[0034] Figure 3 is a schematic diagram of the forward airflow of the branch flow channel of a preferred embodiment of the present invention;

[0035] Figure 4 It is a schematic diagram of the reverse airflow of the branch flow channel according to a preferred embodiment of the present invention.

[0036] Reference numerals list

[0037] 100: light-emitting element; 200: heat exchange support frame; 300: branch flow channel; 400: heat sink; 210: gas flow channel; 202: first flow channel section; 203: second flow channel section; 204: third flow channel section; 205: heat dissipation ridge; 301: first branch flow channel; 302: second branch flow channel; 304: first slope; 303: second slope. DETAILED DESCRIPTION

[0038] The following is a detailed description with reference to the accompanying drawings.

[0039] Example 1

[0040] The present application relates to a passive heat dissipation system for an animal and plant lighting device, such as Figure 1 As shown, it includes a light emitting member 100. The light emitting member 100 is embedded in a heat exchange support frame 200. At least one gas flow channel 210 is provided on one side of the heat exchange support frame 200 where the light emitting member 100 is embedded. A branch flow channel is provided in the internal space of the gas flow channel 210 in a manner that can accelerate the forward airflow while reducing the generation of the reverse airflow during the transfer process. Figure 3 , Figure 4 As shown, the branch flow channel includes at least one first branch flow channel 301 and at least one second branch flow channel 302. The gas flow channel 210 is located on the outer shell of the heat exchange support frame 200, and transmits airflow through the air inlet and the air outlet. The opening at the vertical lower end of the gas flow channel 210 is the air inlet, and the opening at the vertical upper end of the gas flow channel 210 is the air outlet. The light-emitting element 100 can be an LED device. The light-emitting element 100 is embedded in the center of the vertical downward side of the heat exchange support frame 200 through an aluminum plate.

[0041] Preferably, the light emitting element 100 can also use a plurality of light sources arranged in an array. When the light emitting element 100 emits light, the temperature of the central position of the aluminum plate increases. Whether the heat exchange support frame 200 is in an open space or a closed space, the gas flow nature is the same, and there is only a difference in the local diffusion process.

[0042] Specifically, due to the increase in the temperature in the center of the aluminum plate, the air is heated and expands isobarically. According to p=ZρRT, the temperature increases, the pressure remains unchanged, and the density decreases. At this time, the hot air flow rises along the heat exchange support frame 200, and the cold air flows toward the hot air side to form an air flow cycle. That is, as the temperature in the center of the aluminum plate increases, the temperature difference between hot and cold causes the cold air to flow toward the center of the aluminum plate and enter from the air inlet and flow out from the air outlet to form natural convection.

[0043] The first branch channel 301 and the second branch channel 302 of the present invention block the airflow in the gas channel 210 for pressure zone diversion, so that the airflow along the first direction is accelerated and the airflow in the opposite direction of the first direction is reduced, thereby forming airflow convection, so that the heat emitted by the light-emitting component 100 is carried away by the continuous airflow convection, thereby preventing the problem in the prior art that the heat generated by the light-emitting component 100 cannot be carried away by the airflow due to the non-directional air flow, resulting in the light-emitting component 100 being unable to completely dissipate heat, thereby causing the service life of the light-emitting component 100 to be reduced.

[0044] According to a preferred embodiment, several first branch flow channels 301 and second branch flow channels 302 have the same shape and are designed in a mirror image. The shapes of several first branch flow channels 301 and second branch flow channels 302 are set to: have a first slope 304 along the flow direction of the airflow and accelerate the airflow and a second slope 303 connected to the first slope 304 to reduce the reverse airflow during the transfer process. The first slope 304 is a straight diverter with a fixed angle that deviates from the gas flow channel 210. The second slope 303 is a curved diverter with an annular feature and guides the airflow in the opposite direction. The straight diverter and the curved diverter divide the flow path of the gas into multiple pressure zones, and the thrust is generated by the change of the pressure difference to increase the flow rate of the gas. It should be noted that the selection of the angle of the first slope 304 is maintained between 15° and 45°. An angle that is too large or too small will cause different inlet and outlet pressure drops when the airflow enters it, which will cause the airflow to be unable to flow stably.

[0045] According to a preferred embodiment, the working process of the plurality of first branch flow channels 301 and the second branch flow channels 302 is as follows: when the positive airflow passes through the first branch flow channel 301 and / or the second branch flow channel 302, Figure 3 As shown, the forward airflow is divided into a main airflow and a branch airflow, the main airflow maintains the airflow direction, and the branch airflow is redirected by the first branch channel 301 and / or the second branch channel 302, passes through the second slope 303 and the first slope 304 in sequence and merges with the main airflow to accelerate the main airflow; when the reverse airflow passes through the first branch channel 301 and / or the second branch channel 302, as shown Figure 4 As shown, the reverse airflow is divided into a main airflow and a branch airflow. Since the branch airflow passes through the first slope 304 and the second slope 303 in sequence, the branch airflow loses kinetic energy under the pressure gradient of the first slope 304 and the second slope 303, and the branch airflow is directed back to the main airflow to form a vortex for reduction. The combination of a plurality of first branch flow channels 301 and a second branch flow channel 302 is connected so that the reverse airflow does not enter the gas flow channel 210. During the flow of the forward airflow, the gas first expands and then compresses at the second slope 303 and the first slope 304, thereby accelerating the main airflow. The first slope 304 forms a straight branch flow channel with a fixed angle.

[0046] Preferably, the straight flow divider can also adopt a tapered flow divider to further increase its pressure effect. The outlet of the tapered flow divider along the first direction is narrower, while its inlet is wider, so that two pressure zones are separated again in the pressure zone formed by the first slope 304 to accelerate the branch airflow. Similarly, multiple pressure zones can also be separated in the pressure zone formed by the second slope 303. The separation of multiple pressure zones increases the flow rate of the branch airflow during the flow of the reverse airflow, so that the vortex at the intersection with the main airflow is larger to hinder the passage of the reverse airflow.

[0047] According to a preferred embodiment, a plurality of first branch flow channels 301 and second branch flow channels 302 can be symmetrically arranged in the inner space of the heat exchange wall. When a plurality of first branch flow channels 301 and second branch flow channels 302 form a symmetrical structure, it is beneficial to the unidirectional flow performance of the airflow. In other words, the flow of the forward airflow will be accelerated, and the vortex formed by the reverse airflow at the second slope 303 will be larger, thereby hindering the flow of the reverse airflow. However, the setting of the symmetrical structure will lead to a substantial increase in cost and an increase in the fragility of the device. The symmetrical structure causes the opposite side of the first branch flow channel 301 and / or the second branch flow channel 302 to also be a blocking member. The multiple flow channels cause the blocking member to bear a greater fluid pressure, resulting in a reduction in the service life of the branch flow channel 300.

[0048] In this regard, a staggered distance X is set between several first branch flow channels 301 and second branch flow channels 302. The staggered distance X is at least used to characterize "the degree to which the first branch flow channels 301 and the second branch flow channels 302 tend to be symmetrical structures to balance the relationship between the service life of the branch flow channels 300 and the airflow transmission and reduction effects". The smaller the staggered distance X is, the more the several first branch flow channels 301 and the second branch flow channels 302 tend to be symmetrical structures. When the staggered distance X is zero, several first branch flow channels 301 and second branch flow channels 302 form a symmetrical structure. At this time, due to the compact setting of several first branch flow channels 301 and second branch flow channels 302, the transmission and reduction effects on the airflow in the branch flow channel 300 are the greatest, and at the same time, the branch flow channel 300 is also subjected to a large airflow pressure, resulting in a reduction in the service life of the branch flow channel 300 at the current staggered distance X. The maximum staggered distance X is the length of the blocking member, at which time the branch flow channel 300 has the longest service life and has airflow transmission and reduction effects. The offset distance X that "balances the relationship between the service life of the branch flow channel 300 and the airflow transmission and reduction effect" in a numerical way is calculated as follows: at the beginning of designing the branch flow channel 300 or when the branch flow channel 300 is used, obtain the scaling law related to the offset distance X between the first branch flow channel 301 and the second branch flow channel 302 in the branch flow channel 300. The scaling law includes the first branch flow channel length L1 of the first branch flow channel 301, the second branch flow channel length L2 of the second branch flow channel 302, the flow channel width D (especially the corresponding widths of the first flow channel section 202, the second flow channel section 203 and the third flow channel section 204, respectively), the airflow density ρ, the airflow velocity V, the Reynolds number Re, the logarithm N of the first branch flow channel 301 and the second branch flow channel 302, etc. Thus, the optimal value of the offset distance X can be calculated through dimensional analysis. Furthermore, when the offset distance X is zero, the pressure drop formula in the branch channel 300 is: (logarithm of the correction parameter α to the Nth power) × airflow density ρ × (square of airflow velocity V) × length of barrier L × (channel width D to the negative first power) × (Reynolds number Re to the negative quarter power). The pressure drop in the branch channel 300 is obtained by fitting the above formula. The correction parameter α is replaced by the logarithm N and the Reynolds number Re after fitting. In summary, the value of the offset distance X affects the pressure drop ratio of the branch channel 300. The higher the symmetry, the greater the pressure drop. In the case of introducing service life and cost, the appropriate offset distance X for the branch channel 300 can be selected according to the above formula.

[0049] During heat exchange, the humidity of the gas flowing through the airflow channel has a great influence on the efficiency of heat exchange. The presence of moisture in the airflow requires the airflow to absorb or release latent heat when absorbing heat. When the moisture evaporates, the gas needs to absorb heat (latent heat of evaporation), and when the moisture condenses, the gas releases heat (latent heat of condensation), which makes the temperature change of the airflow more complicated.

[0050] According to a preferred embodiment, the above fitting formula needs to be classified and set according to the environmental humidity. For example, the fitting formula of the offset distance X is respectively based on aeroponics, soil culture and hydroponics.

[0051] In order to combine the above pressure drop formula with the characteristics of plant growth in aeroponic, hydroponic and soil culture environments, this application proposes three applicability model formulas to adjust the fitting process when facing an environment with large humidity differences.

[0052] The formula for the offset distance X1 between the first branch flow channel and the second branch flow channel in the lighting device suitable for aeroponics is:

[0053] [ΔP 雾培 =α′·log(N)·ρ·V 2 ·L·D -1 ·Re -1 / 4 ]

[0054] Among them, α' is a correction parameter (adapting to the fog cultivation environment), 2N is the logarithm of the first branch flow channel 301 and the second branch flow channel 302; ρ is the airflow density; V is the airflow velocity; L is the length of the blocking member; D is the flow channel width; Re is the Reynolds number, taking into account the airflow humidity.

[0055] The formula for fitting the offset distance X2 between the first branch flow channel and the second branch flow channel in the hydroponic lighting device is:

[0056]

[0057] Wherein, α" is a correction parameter (adapting to the hydroponic environment); N' is the logarithm of the first branch channel 301 and the second branch channel 302; ρw is the airflow density; V w is the air flow velocity; L' is the length of the barrier; D' is the flow channel width; Re' is the Reynolds number, taking into account the water flow characteristics.

[0058] The formula for fitting the staggered distance X3 between the first branch flow channel and the second branch flow channel in the lighting device suitable for soil cultivation is:

[0059]

[0060] Wherein, α"' is a correction parameter (adapting to the hydroponic environment); N" is the logarithm of the first branch flow channel 301 and the second branch flow channel 302; ρ t is the air flow density; V t is the air flow velocity; L” is the length of the barrier; D” is the flow channel width; Re” is the Reynolds number, taking into account soil moisture.

[0061] According to a preferred embodiment, Figure 1As shown, the gas flow channel 210 is divided into a first flow channel section 202 on one side of the light emitting element 100 and used for passing the airflow, a second flow channel section 203 connected to one end of the airflow flow direction of the first flow channel section 202 and used for accelerating the transmission of the positive airflow, and a third flow channel section 204 connected to one end of the airflow flow direction of the second flow channel section 203. The direction in which the opening side of the first flow channel section 202 points to the light emitting element 100 is the second direction. The extension surfaces of the first direction and the second direction intersect with each other. In the present invention, the first direction can be the vertical direction vertically downward, and the second direction can be the horizontal direction when the light emitting element 100 is in use. The first flow channel section 202, the second flow channel section 203 and the third flow channel section 204 smoothly transition from the first direction to the second direction to change the flow direction of the airflow in a manner of forming an arc-shaped gas flow channel 210. The first flow channel section 202, the second flow channel section 203 and the third flow channel section 204 form an arc-shaped gas flow channel 210. The purpose of such a design is to make the air inlet an inclined opening rather than a vertical downward opening, so that the airflow is easier to flow in and is conducive to the formation of air convection. Since the light-emitting element 100 is located at the center of the vertically downward side of the heat exchange support frame 200, the temperature rise position is also located at the center, resulting in that when air convection is formed, the air inlet is mostly in an inclined direction or horizontal direction, and the vertical airflow is less, so the inclined air inlet is conducive to more airflow entering the gas flow channel 210. This design can also improve the flow direction of the internal airflow, convert the inclined airflow into a vertical airflow, accelerate the formation of convection, and the arc-shaped gas flow channel 210 can increase the pressure on the airflow, increase its flow rate, and thus increase the heat dissipation efficiency.

[0062] According to a preferred embodiment, the branch channel 300 is placed in the second channel section 203, wherein the cross-sectional area of ​​the second channel section 203 in the first direction decreases as the flow path of the airflow along the first direction increases. According to the Bernoulli equation, when the flow rate of the airflow is maintained at a constant value, the smaller the cross-sectional area passed by the airflow, the greater the pressure, that is, the greater the flow rate. In the present invention, the minimum cross-sectional area is reduced to one-third of the maximum cross-sectional area to prevent the cross-sectional area from being too small to hinder the flow of the airflow. Preferably, since the branch channel 300 is placed in the second channel section 203, as shown in FIG. Figure 2As shown, in three-dimensional space, several first branch flow channels 301 and several second branch flow channels 302 can be set in different forms in the second flow channel section 203. For example, the first branch flow channel is oval or teardrop-shaped or elliptical or spherical, and is more preferably teardrop-shaped. The second branch flow channel is oval or teardrop-shaped or elliptical or spherical, and is more preferably teardrop-shaped. Each form is used in different environments. The teardrop shape has the best form, with multiple evenly distributed pressure zones, which can accelerate the forward airflow to the maximum extent and reduce the reverse airflow. It is suitable for environments with a certain temperature difference between the outside world and the temperature rise of the light-emitting element 100. It can form natural convection without auxiliary equipment and is suitable for hydroponic environments. The oval, elliptical or spherical shape has a smooth surface, which has the least obstruction to the flow of airflow, so its effect of accelerating the forward airflow and reducing the reverse airflow is small. Additional airflow conveying parts such as fan assemblies can be set to enhance the convection effect, which is suitable for fog cultivation environments. The oval, elliptical or spherical shape has a longer service life, and when cleaning, there is no dead corner, and dust generated by convection can be effectively removed, which is suitable for soil cultivation environment. Preferably, the above shape presents a columnar shape in the internal space to completely divert the airflow. The first branch flow channel 301 and the second branch flow channel 302 are also used to support the formation of the internal space.

[0063] According to a preferred embodiment, the cross section of the third flow channel section 204 in the first direction is matched with the minimum cross section of the second flow channel section 203 in the first direction. The matched cross sections reduce the resistance of the air flow. After the branch flow channel 300 in the second flow channel section 203, the third flow channel section 204 is connected with the outside to perform heat exchange.

[0064] According to a preferred embodiment, a plurality of gas flow channels 210 are arranged on the outer layer of the heat exchange support frame 200, wherein a gap space is provided between two adjacent gas flow channels 210 and is filled with a plurality of heat dissipation ridges 205, the heat dissipation ridges 205 are connected to the light emitting element 100 and used to transfer the heat energy of the light emitting element 100, and the airflow in the plurality of gas flow channels 210 takes away the heat energy of the heat dissipation ridges 205. The circulating convection of the airflow transfers the heat in the heat dissipation ridges 205. The plurality of heat dissipation ridges 205 also support the heat exchange support frame 200, thereby supporting the gas flow channels 210. Preferably, the heat dissipation ridges 205 can be selected to be made of metal or plastic. Metal materials dissipate heat quickly, but are too heavy and costly. The heat dissipation effect of plastic materials is not as good as that of metal materials, but the cost is cheap.

[0065] According to a preferred embodiment, the heat exchange support frame 200 also includes an inner tower structure, which includes a plurality of heat sinks 400, which are stacked at intervals along the first direction and connected to the heat dissipation ridge 205. The heat sink 400 can be, for example, a 0.5 mm aluminum fin. The plurality of heat dissipation ridges 205 form a bracket of the inner tower structure. The plurality of heat dissipation ridges 205 conduct heat of the light-emitting element 100 and are provided with a plurality of heat dissipation ridges 205, so that a large amount of heat energy emitted by the light-emitting element 100 is transferred to the heat sink 400 through the heat dissipation ridges 205, thereby improving the heat dissipation efficiency and the utilization rate of the heat sink 400, ensuring the long-term operation of the light-emitting element 100, preventing the light-emitting element 100 from being overheated and burned, thereby causing the delay of plant growth, and improving the service life of the light-emitting element 100. In addition, the gas flow channel 210 provided in the present invention can further accelerate the heat transfer between the heat dissipation ridge 205 and the heat sink 400, thereby improving the heat dissipation efficiency.

[0066] Preferably, the heat sink 400 may be provided with a plurality of heat dissipation holes to form a heat dissipation air duct. The heat dissipation holes have vertical edges (i.e., flanged holes), which can form heat dissipation air ducts with each other while keeping the heat dissipation area of ​​the heat sink 400 unchanged, and can also improve the plastic fluidity of the heat sink 400 to prevent the heat sink 400 from being damaged due to long-term use during the heat dissipation process. It is clear to select an appropriate number of heat sinks 400 according to size requirements. A small number of heat sinks 400 and heat dissipation ridges 205 are required, and a good heat dissipation effect is achieved, which reduces cost consumption, while reducing the weight of the heat exchange support frame 200, making it convenient for flexible use.

[0067] The heat dissipation process of the airflow convection is that: the light-emitting element 100 is turned on, the central temperature of the side of the heat exchange support frame 200 embedded with the light-emitting element 100 rises, and the heat is transferred through the heat dissipation ridge 205 and the plurality of heat dissipation fins 400. As the central temperature of the side of the heat exchange support frame 200 embedded with the light-emitting element 100 rises and the heat is diffused to the heat dissipation ridge 205, the temperature of the air in the gas flow channel 210 in contact with the heat dissipation ridge 205 also rises. As a result, the internal hot air of the gas flow channel 210 rises along the plurality of gas flow channels 210, and the temperature difference between the external cold air and the internal hot air and the increase in the density of the hot air cause the cold air to flow toward the gas flow channel 210 and enter from the air inlet and flow out from the air outlet to form natural convection. The convection process takes away the heat in the heat dissipation ridge 205 and the plurality of heat dissipation fins 400, especially the heat of the plurality of heat dissipation ridges 205 arranged in the gap space between two adjacent gas flow channels 210. The inner tower structure of several heat sinks 400 transfers heat to several heat dissipation ridges 205 and is carried out by air flow, which accelerates the heat dissipation effect. In addition, the heat dissipation is passive and does not require additional energy consumption. Once the light-emitting component 100 is turned on, passive heat dissipation begins, and air circulation convection is automatically formed, effectively improving the service life of the light-emitting component 100.

[0068] The present invention also relates to a passive heat dissipation method for an animal and plant lighting device, the method comprising controlling the flow path of the airflow. The flow path of the airflow comprises a path through a main channel, a plurality of first branch channels 301 paths, and a plurality of second branch channels 302 paths, wherein when the positive airflow passes through the path of the first branch channel 301 and / or the path of the second branch channel 302, the positive airflow is divided into a main airflow and a branch airflow, the main airflow maintains the airflow direction, and the branch airflow is redirected by the first branch channel 301 and / or the second branch channel 302, and then merges with the main airflow to accelerate the main airflow.

[0069] Throughout the text, the features referred to as “preferably” are merely optional and should not be understood as having to be set. Therefore, the applicant reserves the right to abandon or delete the relevant preferred features at any time.

[0070] It should be noted that the above specific embodiments are exemplary, and those skilled in the art can come up with various solutions inspired by the disclosure of the present invention, and these solutions also belong to the disclosure scope of the present invention and fall within the protection scope of the present invention. Those skilled in the art should understand that the present invention description and its drawings are illustrative and do not constitute a limitation of the claims. The protection scope of the present invention is defined by the claims and their equivalents.

Claims

1. A passive heat dissipation system for an animal and plant lighting device, comprising a heat exchange support frame (200) and a light emitting element (100) embedded in the heat exchange support frame (200), characterized in that: At least one gas flow channel (210) for transferring heat inside and outside the heat exchange support frame (200) is arranged inside the heat exchange wall of the heat exchange support frame (200) in contact with the external space, and the gas flow channel (210) extends along the height direction of the heat exchange support frame (200), so that the air flow flows from the direction of the light-emitting element (100) to the top or outside of the heat exchange support frame (200), wherein: The gas flow channel (210) is provided with a plurality of branch flow channels (300) with an island structure on both sides of the path of the main flow channel, thereby reducing the airflow in the gas flow channel (210) flowing in the direction of the light-emitting element (100).

2. The passive heat dissipation system of the animal and plant lighting device according to claim 1, characterized in that: The gas flow channel (210) comprises a plurality of first branch flow channels (301) and a plurality of second branch flow channels (302) distributed on both sides of the gas flow channel (210) with the main flow channel as the central axis, and the plurality of first branch flow channels (301) and the plurality of second branch flow channels (302) are arranged in a staggered manner.

3. The passive heat dissipation system of the animal and plant lighting device according to claim 2, characterized in that: The shapes of the plurality of first branch flow channels (301) and second branch flow channels (302) are set as follows: The invention has a first slope (304) along the flow direction of the airflow and accelerating the airflow, and a second slope (303) connected to the first slope (304) to reduce the reverse airflow during the transfer process, wherein the first slope (304) is a straight branch channel with a fixed angle that deviates from the gas flow channel (210), and the second slope (303) is a curved branch channel with an annular feature and directing the airflow in the opposite direction.

4. The passive heat dissipation system of the animal and plant lighting device according to claim 3, characterized in that: The gas flow channel (210) is divided into a first flow channel section (202) on one side of the light-emitting element (100) and used for introducing airflow, a second flow channel section (203) connected to one end of the first flow channel section (202) in the airflow direction and used for accelerating the transmission of positive airflow, and a third flow channel section (204) connected to one end of the second flow channel section (203) in the airflow direction, wherein: The direction in which the opening side of the first flow channel section (202) points to the light-emitting element (100) is the second direction, and the extension surfaces of the first direction and the second direction intersect with each other. The first flow channel section (202), the second flow channel section (203) and the third flow channel section (204) smoothly transition from the first direction to the second direction to form the arc-shaped gas flow channel (210), thereby changing the flow direction of the gas flow.

5. The passive heat dissipation system of the animal and plant lighting device according to claim 4, characterized in that: The branch flow channel (300) is disposed in the second flow channel section (203), wherein: The cross-sectional area of ​​the second flow channel section (203) in the first direction decreases as the flow path of the airflow along the first direction increases.

6. The passive heat dissipation system of the animal and plant lighting device according to claim 5, characterized in that: The cross section of the third flow channel section (204) in the first direction is adapted to the minimum cross section of the second flow channel section (203) in the first direction.

7. The passive heat dissipation system of the animal and plant lighting device according to any one of claims 1 to 6, characterized in that: A plurality of the gas flow channels (210) are arranged on the outer layer of the heat exchange support frame (200), wherein: A gap space is provided between two adjacent gas flow channels (210) and is filled with a plurality of heat dissipation ridges (205); the heat dissipation ridges (205) are connected to the light-emitting element (100) and are used to transfer heat energy of the light-emitting element (100); and the airflow in the plurality of gas flow channels (210) takes away the heat energy of the heat dissipation ridges (205).

8. The passive heat dissipation system of the animal and plant lighting device according to claim 7, characterized in that: The heat exchange support frame (200) further comprises a plurality of heat sinks (400) arranged in an inner tower structure, wherein the plurality of heat sinks (400) are stacked at intervals along a first direction and connected to the heat dissipation ridge (205).

9. The passive heat dissipation system of the animal and plant lighting device according to claim 7, characterized in that: A plurality of first branch flow channels (301) and a plurality of second branch flow channels (302) can be arranged in different forms in the second flow channel section (203).

10. A passive heat dissipation method for an animal and plant lighting device, characterized in that: The method comprises controlling a flow path of an airflow, wherein the flow path of the airflow comprises a path passing through a main flow channel, a plurality of first branch flow channels (301) and a plurality of second branch flow channels (302), When the positive airflow passes through the path of the first branch flow channel (301) and / or the path of the second branch flow channel (302), the positive airflow is divided into a main airflow and a branch airflow, the main airflow maintains the airflow direction, and the branch airflow is redirected by the first branch flow channel (301) and / or the second branch flow channel (302), and then merges with the main airflow to accelerate the main airflow.

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