A lighting system suitable for high humidity and heat environments

Abstract

The application relates to a lighting system suitable for a high-humidity and high-temperature environment, which comprises a cylindrical shell, a heat dissipation base plate, lamp beads, a light-transmitting cover, a heat dissipation fan and a wind baffle. The heat dissipation base plate is provided with a circular ring-shaped first heat dissipation wall and a cylindrical second heat dissipation wall, and a first air duct is formed in the second heat dissipation wall; the lamp beads are thermally coupled to the first heat dissipation wall and the second heat dissipation wall; the wind baffle is rotationally connected to the air outlet end of the first air duct and is provided with an air-permeable opening, a leaf plate connected through a bimetallic sheet is arranged at the air-permeable opening, the leaf plate blocks the air-permeable opening at low temperature, and airflow laterally sweeps the bottom wall of the light-transmitting cover to prevent condensation; at high temperature, the bimetallic sheet drives the leaf plate to open the air-permeable opening to increase the flow rate, and the deflected leaf plate drives the wind baffle to rotate to generate a rotational flow under the pushing of the airflow. The application realizes the self-adaptive switching of the low-temperature condensation prevention and the high-temperature strong heat dissipation mode without relying on an electronic sensor, and effectively expands the illumination range through the ring cylinder combined with the light distribution structure.

Description

Technical Field

[0001] This application relates to the field of lighting, and in particular to a lighting system suitable for high humidity and heat environments. Background Technology

[0002] In high-humidity and high-temperature environments such as food processing workshops, mines, and industrial plants, lighting systems face the dual challenges of high-temperature heat dissipation and high-humidity protection. High ambient temperature and poor ventilation make it difficult for the heat generated by high-power LED beads to dissipate effectively, which can easily lead to increased junction temperature, accelerated light decay, and shortened lifespan. At the same time, the extremely high ambient humidity makes it easy for condensation to form inside the lamp or on the surface of the light-transmitting cover, which seriously reduces the light transmittance.

[0003] To address the aforementioned issues, existing technologies have proposed several lighting solutions suitable for humid and hot environments. Common designs include: employing a well-sealed housing and light-transmitting cover to prevent external moisture intrusion; installing heat dissipation fins inside and outside the housing and using a cooling fan for forced air cooling; some improved solutions also guide the cooling airflow to the surface of the light-transmitting cover in order to reduce condensation formation through airflow; however, these existing solutions still have significant shortcomings. First, the heat dissipation substrate mostly adopts a single-layer flat structure, and the LEDs can only be arranged on one side, resulting in a single light output direction and uneven light field distribution. In situations requiring a larger illumination range, it is often necessary to increase the number of lamps, which further exacerbates the heat dissipation burden. Second, regardless of whether the air blown by the fan is directed towards the heat dissipation substrate or the light-transmitting cover, it cannot be dynamically adjusted according to changes in the internal temperature of the lamp. During the cold start phase of the lamp, the light-transmitting cover is most prone to fogging when its temperature is below the dew point, requiring more airflow to purge the cover and suppress condensation. When the LEDs are operating at high power and the heat dissipation substrate temperature is too high, it is necessary to change the airflow direction or form a vortex to enhance convective heat transfer. Fixed airflow schemes cannot simultaneously meet these two opposing needs. Furthermore, although theoretically, electronic temperature sensors, controllers, and electric dampers can be used to achieve adaptive airflow adjustment, especially in environments with high humidity, high temperature, or even corrosive vapors, electronic temperature sensors are prone to condensation short circuits and signal drift. The long-term reliability of controllers and electric dampers drops sharply, making the entire adaptive system a new point of failure and significantly increasing costs.

[0004] Therefore, existing lighting systems for high humidity and heat environments suffer from fixed airflow organization, making it impossible to dynamically balance the anti-condensation requirements during low-temperature startup and the enhanced heat dissipation requirements during high-temperature operation. In addition, the conventional heat dissipation substrate has a simple structure, resulting in limited lighting range. How to enable the lighting system to automatically switch its airflow operating mode according to its own temperature changes and simultaneously expand the effective lighting range without relying on a complex electronic control system has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, this application provides a lighting system suitable for high humidity and heat environments, which can achieve adaptive switching between low temperature anti-condensation and high temperature strong heat dissipation modes without relying on electronic sensors, and effectively expands the illumination range through the combination of ring cylinder and light distribution structure.

[0006] This application is achieved through the following technical solution: A lighting system suitable for high humidity and heat environments, comprising: A housing, wherein the housing has a cylindrical structure; A heat dissipation substrate is disposed inside the housing and has a first heat dissipation wall in a circular structure and a second heat dissipation wall formed in the middle of the first heat dissipation wall and having a cylindrical structure. A first ventilation channel is formed inside the second heat dissipation wall. The LED chip is thermally coupled to the first heat dissipation wall and the second heat dissipation wall; A light-transmitting cover is fixed to the lower end of the housing and forms a closed space with the heat dissipation substrate to accommodate the lamp beads; A cooling fan is located above the housing and is used to dissipate heat from the heat dissipation substrate; A wind deflector is rotatably connected to the air outlet end of the first ventilation duct, and forms a lateral air outlet with the first ventilation duct; the wind deflector is provided with a plurality of air vents; the air vents are provided with blades, and the blades are connected to the wind deflector by bimetallic strips. The bimetallic strip is configured such that: when the temperature of the airflow in the first ventilation duct is not greater than a preset temperature, the blade is kept in a state of blocking the vent, so that the airflow cannot drive the baffle body to rotate, thereby guiding the airflow in the first ventilation duct to blow laterally across the bottom wall of the light-transmitting cover 4; when the temperature of the airflow in the first ventilation duct is greater than the preset temperature, the bimetallic strip thermally deforms and drives the blade to shift to a state of opening the vent, thereby reducing the flow resistance in the first ventilation duct, thereby increasing the flow rate of the airflow inside the first ventilation duct, and the shifted blade can drive the baffle to rotate under the push of the airflow, and generate swirling flow in the first ventilation duct.

[0007] By adopting the above technical solution, the LED beads are simultaneously thermally coupled to both the first heat dissipation wall of the annular structure and the second heat dissipation wall of the cylindrical structure. This creates a two-layer three-dimensional lighting arrangement combining an annular light source and a central cylindrical light source. Compared to the traditional solution where LED beads are arranged on a single plane heat dissipation substrate, this significantly expands the overall illumination range of the lighting system and ensures sufficient illumination for both the near-field annular region and the far-field central region. This avoids the common problem of overly bright light centers and dark edges in single-plane lighting. Simultaneously, when the heat dissipation substrate temperature is low, the bimetallic strip keeps the blades blocking the air vents, preventing airflow from driving the baffle to rotate. Instead, the airflow blows directionally from the side outlet. The bottom wall of the light-transmitting cover effectively suppresses condensation formation under low temperature and high humidity conditions. When the temperature of the heat dissipation substrate rises above the second threshold, the bimetallic strip thermally deforms and drives the blades to shift to the open position, increasing the airflow rate in the first ventilation duct. The shifted blades, driven by the airflow, drive the baffle to rotate around its axis, thereby generating swirling air in the first ventilation duct and significantly enhancing convective heat transfer between the heat dissipation substrate and the air. This solution achieves adaptive switching between low temperature anti-condensation and high temperature strong heat dissipation modes without relying on electronic temperature sensors and control circuits. At the same time, the lighting range is expanded through the ring-cylinder combined lighting structure, comprehensively optimizing the lighting performance and reliability in high humidity and heat environments.

[0008] Optionally, a plurality of ventilation openings on the wind deflector are evenly distributed circumferentially, and the total area of ​​the ventilation openings accounts for 30% to 60% of the total area of ​​the wind deflector.

[0009] By adopting the above technical solution, the air vents are evenly distributed circumferentially and the total opening area accounts for 30% to 60% of the area of ​​the baffle plate. This ensures that the lateral air outlets are uniformly distributed circumferentially in the low-temperature closed state and avoids dead zones of air sweeping. When the air vents are opened at high temperatures, the windward area provided by the air vents can generate sufficient aerodynamic thrust to drive the baffle plate to rotate stably. At the same time, the swirling intensity will not be weakened due to insufficient pressure in the swirling core area caused by excessively large openings. Thus, the best match between reliable start-up of the baffle plate and enhanced heat dissipation through swirling is achieved with simple structural optimization.

[0010] Optionally, the upper end of the wind deflector is provided with a plurality of vertically arranged spoilers evenly distributed along the circumference, and the spoilers extend into the first ventilation duct.

[0011] By adopting the above technical solution, vertical baffles are set on the upper surface of the baffle and extended into the first ventilation duct. When the baffle rotates under high temperature conditions, these baffles generate continuous shearing and disturbance to the central flow, forcing the vortex to form earlier and enhancing the turbulence, thereby increasing the convective heat transfer rate between the airflow and the second heat dissipation wall, accelerating the transfer of accumulated heat to the outside, improving the high temperature heat dissipation performance without increasing the system power consumption.

[0012] Optionally, the bimetallic strip is composed of two metal strips with different coefficients of thermal expansion, with the metal strip with the lower coefficient of thermal expansion arranged on the side closer to the blade.

[0013] By employing the above technical solution, a metal sheet with a low coefficient of thermal expansion is arranged near the blade. This ensures that when the bimetallic strip is heated, the bending direction of the active layer drives the blade to shift towards the open position, while the passive layer provides a reliable seal when the blade is closed. This layering arrangement ensures that the direction of temperature control action is the same as the direction of aerodynamic thrust, avoiding jamming or accidental opening caused by reverse action, and achieving good sealing and reset during cooling, thus ensuring that the low-temperature demisting mode is not disturbed.

[0014] Optionally, the housing has a double-layer structure, having an outer wall and an inner wall; a second ventilation channel is formed between the outer wall and the inner wall; the outer wall of the housing extends upward and beyond the heat dissipation substrate, and a bent windbreak is formed at the top of the outer wall to guide part of the airflow to the side wall of the light-transmitting cover.

[0015] By adopting the above technical solution, the shell uses a double-layer structure of outer and inner walls to form a second ventilation channel, and the outer wall extends upward to form a bent windbreak. Part of the fan airflow is guided into the second ventilation channel and blown towards the side wall of the light-transmitting cover, forming an annular air curtain. This solves the problem that the side wall of the light-transmitting cover is still prone to fogging due to the central ventilation channel only blowing the bottom wall. Without adding additional air passages or components, comprehensive anti-fog protection for the entire light-transmitting cover is achieved, maintaining high light transmittance in high humidity environments.

[0016] Optionally, a plurality of vertically arranged support ribs are provided between the outer wall and the inner wall.

[0017] By adopting the above technical solution, vertical support ribs are added between the outer wall and the inner wall. This not only enhances the rigidity and vibration resistance of the double-layer shell structure, but also divides the second ventilation duct into multiple uniform flow channels, making the air curtain velocity distribution on the side wall more consistent and preventing the occurrence of local low wind speed areas. This ensures that there are no blind spots in the anti-fogging of the side wall of the light-transmitting cover, and at the same time improves the heat dissipation conditions of the outer ring of the heat dissipation substrate.

[0018] Optionally, the lamp bead includes a first lamp bead and a second lamp bead, the first lamp bead being disposed on the first heat dissipation wall and the second lamp bead being disposed on the second heat dissipation wall; and the housing is provided with a human body sensor for sensing the distance between a human body and the lamp bead; the human body sensor, the first lamp bead and the second lamp bead are electrically connected to the control unit of the lighting system.

[0019] By adopting the above technical solution, the lamp beads are divided into the first lamp beads disposed on the first heat dissipation wall and the second lamp beads disposed on the second heat dissipation wall, and a human body sensor is additionally provided, so that the lighting system obtains the ability to sense the position of people. This configuration allows the control unit to independently adjust the brightness of the inner and outer ring lamp beads according to the distance between the person and the lamp, solving the requirement conflict in high humidity and high temperature lighting scenarios that when people are at a long distance, strong light in the center is needed for identification, and when people are at a short distance, a large uniform light spot is needed and glare should be avoided, providing a hardware basis for realizing zoned intelligent dimming.

[0020] Optionally, the control unit adjusts the brightness of the first lamp beads and the second lamp beads respectively according to the distance detected by the human body sensor: when the distance of the human body is greater than the preset long-distance threshold, increase the brightness of the second lamp beads and decrease the brightness of the first lamp beads; when the distance of the human body is less than the preset short-distance threshold, increase the brightness of the first lamp beads and decrease the brightness of the second lamp beads.

[0021] By adopting the above technical solution, the control unit implements linkage control according to the distance measured by the human body sensor: when the distance of the human body is greater than the preset long-distance threshold, increase the brightness of the second lamp beads and decrease the brightness of the first lamp beads, and converge the light into a central light column to meet the need for long-distance observation; when the distance of the human body is less than the preset short-distance threshold, increase the brightness of the first lamp beads and decrease the brightness of the second lamp beads, and switch the lighting to a large-area uniform near-field light spot to eliminate the dazzling glare in the center. This method enables the light pattern to automatically adapt to the change of the person's position, improves visual comfort and operation safety, and at the same time dynamically manages power consumption and prolongs the life of the lamp beads.

[0022] Optionally, the human body sensor is an infrared ranging sensor, an ultrasonic sensor or a microwave radar sensor, and is installed on the outer wall of the housing.

[0023] By adopting the above technical solution, an infrared ranging sensor, an ultrasonic sensor or a microwave radar sensor is selected and installed on the outer wall of the housing, which can accurately and quickly obtain the distance information between the human body and the lamp, providing reliable input for zoned dimming. The selected sensor form can adapt to long-term use in high temperature and high humidity environments, and has a high integration degree in the installation position, without affecting the original sealing and protection level of the lamp.

[0024] Optionally, the outer wall of the light-transmitting cover is coated with a hydrophilic anti-fog coating.

[0025] By adopting the above technical solution, a hydrophilic anti-fog coating is coated on the inner wall of the light-transmitting cover, so that when moisture condenses, a continuous water film is formed instead of discrete water droplets, effectively suppressing the brightness loss caused by light scattering. The coating and the air flow blowing work together to still prevent atomization and light loss when the fan rotates at a low speed or stops rotating for a short time, providing long-term stable anti-fog redundancy for the light-transmitting cover and ensuring that the lighting quality does not decline due to working condition fluctuations.

[0026] In summary, this application includes at least one of the following beneficial technical effects: The cooling fan of this application provides airflow to the heat dissipation substrate. Combined with the first ventilation channel of the heat dissipation substrate, it can dissipate heat quickly and solve the problem of low heat dissipation efficiency of simple heat dissipation fins. The bimetallic sheet of this application changes the position of the blade according to the temperature of the heat dissipation substrate. At low temperature, it blows the bottom wall of the light-transmitting cover, and at high temperature, it makes the baffle plate rotate to generate swirling air, thereby achieving intelligent heat dissipation and avoiding the drawbacks of ordinary fans that lack intelligent adjustment. The hydrophilic anti-fog coating on the inner wall of the light-transmitting cover of this application can effectively prevent fogging, avoiding the problems of easy damage to the anti-fog film, untimely manual wiping, and limited local anti-fog effect of dehumidification equipment. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural schematic diagram of the lighting system suitable for high humidity and heat environments described in Embodiment 1 of this application; Figure 2 This is a cross-sectional structural schematic diagram of the lighting system suitable for high humidity and heat environments described in Embodiment 1 of this application; Figure 3 This is a three-dimensional structural diagram of the wind deflector blades in the state of blocking the air vents as described in Embodiment 1 of this application; Figure 4 This is a three-dimensional structural diagram of the wind deflector blades in the open vent state as described in Embodiment 1 of this application; Figure 5 This is a cross-sectional structural schematic diagram of the lighting system suitable for high humidity and heat environments described in Embodiment 2; Figure 6 This is a schematic diagram of the structure of the second ventilation duct in Embodiment 2 of this application; Figure 7 This is a cross-sectional structural schematic diagram of the lighting system suitable for high humidity and heat environments described in Embodiment 3 of this application.

[0028] In the diagram: 1. Housing; 11. Outer wall; 111. Bending windbreak; 12. Inner wall; 13. Second ventilation duct; 14. Support rib; 15. Fan cover; 151. Air inlet; 2. Heat dissipation base plate; 21. First heat dissipation wall; 22. Second heat dissipation wall; 23. First ventilation duct; 231. Connecting rod; 232. Mounting base; 3. LED bead; 31. First LED bead; 32. Second LED bead; 4. Light-transmitting cover; 5. Cooling fan; 6. Wind baffle; 61. Side air outlet; 62. Air vent; 63. Blade; 64. Bimetallic strip; 65. Spoiler; 66. Rotating shaft; 7. Human body sensor; 8. Control unit. Detailed Implementation

[0029] The technical solutions of various embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Example 1

[0030] Reference Figures 1 to 3 This application discloses a lighting system suitable for high humidity and heat environments, comprising: Shell 1, the shell has a cylindrical structure; The heat dissipation substrate 2 is disposed inside the housing and has a first heat dissipation wall 21 with a circular structure and a second heat dissipation wall 22 formed in the middle of the first heat dissipation wall and having a cylindrical structure. A first ventilation channel 23 is formed inside the second heat dissipation wall 22. LED 3 is thermally coupled to the first heat dissipation wall and the second heat dissipation wall; The light-transmitting cover 4 is fixed to the lower end of the housing 1 and forms a closed space with the heat dissipation substrate 2 to accommodate the lamp beads; A cooling fan 5 is located above the housing 1 and is used to dissipate heat from the heat dissipation substrate 2. The wind deflector 6 is rotatably connected to the air outlet end of the first ventilation duct 23 and forms a lateral air outlet 61 with the first ventilation duct 23; the wind deflector 6 is provided with a plurality of air vents 62; the air vents 62 are provided with blades 63, and the blades 63 are connected to the wind deflector 6 by bimetallic strips 64. The bimetallic strip 64 is configured such that: when the temperature of the airflow in the first ventilation duct 23 is not greater than a preset temperature, the blade 63 is kept in a state of blocking the air vent 62, so that the airflow cannot drive the body of the baffle 6 to rotate, thereby guiding the airflow in the first ventilation duct 23 to blow laterally onto the bottom wall of the light-transmitting cover 4; when the temperature of the airflow in the first ventilation duct 23 is greater than the preset temperature, the bimetallic strip 64 thermally deforms and drives the blade 63 to shift to a state of opening the air vent 62, thereby reducing the flow resistance in the first ventilation duct 23, thereby increasing the flow rate of the airflow inside the first ventilation duct 23, and the shifted blade 63 can drive the baffle 6 to rotate under the push of the airflow, and generate a swirling flow in the first ventilation duct 23.

[0031] Reference Figures 2 to 4Specifically, the housing 1 has a cylindrical structure and is made of aluminum alloy with good thermal conductivity in this embodiment. The heat dissipation substrate 2 is disposed inside the housing 1 and has a first heat dissipation wall 21 with a circular structure and a second heat dissipation wall 22 with a cylindrical structure formed in the middle of the first heat dissipation wall 21. The interior of the second heat dissipation wall 22 forms a first ventilation channel 23. The lamp bead 3 is an LED lamp bead and is thermally coupled to the first heat dissipation wall 21 and the second heat dissipation wall 22. Specifically, it can be attached by means of thermally conductive adhesive or welding. The light-transmitting cover 4 is fixed at the lower end of the housing 1 and forms a closed space with the heat dissipation substrate 2 to accommodate the lamp bead 3. The light-transmitting cover 4 can be made of transparent PC or glass and its outer wall is coated with a hydrophilic anti-fog coating.

[0032] Reference Figures 2 to 4 The cooling fan 5 is located above the housing 1 to provide airflow to the heat dissipation base plate 2; the upper end of the housing 1 is provided with a fan cover 15, the cooling fan 5 is fixed in the fan cover 15, and the fan cover 15 has several air inlets 151 evenly distributed around its circumference.

[0033] Reference Figures 2 to 4 The baffle plate 6 is rotatably connected to the air outlet end of the first ventilation duct 23 and forms a lateral air outlet 61 with the first ventilation duct 23. Specifically, the mounting base 232 is fixed in the first ventilation duct 23 by a connecting rod 231, and a rotating shaft 66 is fixed on the back of the baffle plate 6 and is rotatably connected to the mounting base 232 by the rotating shaft.

[0034] Reference Figures 2 to 4 The wind deflector 6 has several air vents 62, which are evenly distributed circumferentially, and the total area of ​​the vents accounts for 45% of the total area of ​​the wind deflector 6. Each air vent 62 is provided with a blade 63, which is connected to the wind deflector 6 by a bimetallic strip 64. The bimetallic strip 64 is composed of two layers of metal strips with different coefficients of thermal expansion, with the metal strip with the lower coefficient of thermal expansion arranged on the side closer to the blade 63. In addition, several vertically arranged baffles 65 are evenly distributed circumferentially on the upper end of the wind deflector 6, which extend into the first ventilation duct 23 and are used to agitate the airflow when the wind deflector 6 rotates.

[0035] Reference Figures 2 to 4The bimetallic strip 64 is configured such that: when the temperature of the airflow in the first ventilation duct 23 is not greater than the preset temperature, the blade 63 is kept in the closed vent 62 state, so that the airflow cannot drive the baffle 6 body to rotate, thereby guiding the airflow in the first ventilation duct 23 to blow laterally onto the bottom wall of the light-transmitting cover 4; when the temperature of the airflow in the first ventilation duct 23 is not greater than the preset temperature, the bimetallic strip 64 thermally deforms to drive the blade 63 to shift to the open vent 62 state, thereby increasing the airflow rate in the first ventilation duct 23, and the shifted blade 63 can drive the baffle 6 body to rotate around its axis under the push of the airflow, thereby generating a vortex in the first ventilation duct 23, and the shift amplitude of the blade 63 is greater when the temperature of the airflow in the first ventilation duct 23 further increases; it can be understood that the preset temperature T0 is not a strictly fixed value, but a deformation transition range defined by the material, thickness and prestress of the bimetallic strip 64. For example, the bimetallic strip uses a manganese-nickel-copper alloy with a high coefficient of expansion and Invar steel with a low coefficient of expansion. By adjusting the initial preload when the blade 63 is closed, the flipping action point can be calibrated to the required T0, such as 40±5℃, through a simple experiment.

[0036] Reference Figures 2 to 4 When the lighting system is initially started or the ambient temperature is low, the temperature of the heat dissipation substrate 2 is low, while the temperature of the airflow in the first ventilation duct has not reached the preset temperature. The bimetallic strip 64 maintains its initial shape, and the blade 63 closes the vent 62. The airflow delivered by the cooling fan 5 flows downward along the first ventilation duct 23. Since the vent 62 is closed, the airflow cannot pass downward through the baffle plate 6 and can only be discharged from the side air outlet 61, thus blowing towards the bottom wall of the light-transmitting cover 4 at a certain angle and dispersing the condensation formed on the outer wall surface of the light-transmitting cover 4 when the lighting system is not in operation.

[0037] Reference Figures 2 to 4When the LED bead 3 operates at high power for an extended period or the ambient temperature rises, causing the temperature of the heat sink substrate 2 to exceed the preset temperature, the bimetallic strip 64 bends and deforms due to the difference in thermal expansion between the two metal layers, bending towards the side with the lower coefficient of thermal expansion, i.e., shifting downwards. This drives the blade 63 to open downwards, exposing the vent 62. At this time, some airflow can pass downwards through the vent 62, increasing the airflow rate while also impacting the windward side of the blade 63. Since the blade 63 has shifted, its angle of attack causes the airflow force to be generated. The tangential component of the rotation axis of the baffle plate 6 drives the baffle plate 6 to rotate continuously. When the baffle plate 6 rotates, the baffle plate 65 at its upper end rotates accordingly, continuously shearing and stirring the air in the first ventilation duct 23, thereby forming a strong vortex in the descending airflow, which greatly increases the relative flow velocity and turbulence intensity between the air and the outer surface of the second heat dissipation wall 22, thereby significantly improving the heat dissipation efficiency. When the temperature of the heat dissipation substrate 2 drops below the first threshold, the bimetallic strip 64 returns to its original state, the blade 63 re-closes the air vent 62, and the system returns to the anti-condensation mode.

[0038] It should be noted that under high-temperature conditions, as the overall system temperature rises, the temperature of the light-transmitting cover 4 also quickly exceeds the ambient dew point, and the risk of condensation is naturally eliminated. Therefore, there is no need to specially set up a defogging airflow at this time.

[0039] The implementation principle of this embodiment is as follows: This lighting system, through the special structure of the heat dissipation substrate and the cooperation of the cooling fan, can effectively dissipate the heat generated by the LED beads. The baffle plate performs different functions according to the temperature change of the heat dissipation substrate. In the initial stage of the lighting system startup, the LED beads generate little heat and the heat dissipation demand is low, but the surface of the light-transmitting cover is most prone to condensation due to temperature difference. At this time, the present invention directs all airflow to the bottom wall of the light-transmitting cover, achieving anti-condensation priority. As the temperature of the LED beads rises, the heat dissipation demand increases sharply, while the temperature of the light-transmitting cover has risen above the dew point, and the anti-condensation demand naturally disappears. The present invention automatically switches to the swirling enhanced heat dissipation mode. The two modes are perfectly matched on the time axis and can be achieved without relying on electronic sensors. In addition, when the system is configured to increase the airflow of the cooling fan according to the temperature rise, the larger airflow will further accelerate the rotation of the baffle plate and enhance the swirling intensity, forming a positive feedback synergistic effect, further improving the high-temperature heat dissipation capacity. Compared with traditional lighting systems, this lighting system has better heat dissipation and anti-fog performance in high humidity and heat environments, extends the service life of the lamps, reduces maintenance costs, and has significant improvements and contributions to the existing technology. Example 2

[0040] Reference Figures 5 to 6The difference between this embodiment and the first embodiment is that the shell 1 has a double-layer structure, with an outer wall 11 and an inner wall 12; a second ventilation channel 13 is formed between the outer wall 11 and the inner wall 12; the outer wall 11 extends upward and beyond the heat dissipation substrate 2, and a bent windproof part 111 is formed at the top of the outer wall 11 to guide part of the airflow to blow towards the side wall of the light-transmitting cover 4; a number of vertically arranged support ribs 14 are provided between the outer wall 11 and the inner wall 12.

[0041] Reference Figures 5 to 6 The airflow delivered by the cooling fan 5 does not all enter the first ventilation duct 23, but a portion is captured by the bent wind baffle 111 and guided into the second ventilation duct 13. This portion of the airflow flows downward along the gap between the outer wall 11 and the inner wall 12. After being guided by the bent wind baffle 111, it blows from the lower end of the housing 1 towards the side wall of the light-transmitting cover 4. At the same time, the airflow in the first ventilation duct 23 is still controlled by the wind baffle 6 in the manner of Embodiment 1, and can be selectively blown towards the bottom wall of the light-transmitting cover 4. Therefore, the entire outer wall of the light-transmitting cover 4 is swept by hot air, and the anti-condensation coverage is more comprehensive. The supporting rib 14 strengthens the structural rigidity of the double-layer housing 1 on the one hand, and rectifyes the airflow in the second ventilation duct 13 on the other hand, reducing turbulence loss and making the blown airflow more uniform.

[0042] The implementation principle of this embodiment is as follows: The double-layered shell structure and the second ventilation duct increase the airflow path and further improve heat dissipation efficiency; the bent windbreak guides part of the airflow to blow towards the side wall of the light-transmitting cover, which helps to prevent fogging on the side wall of the light-transmitting cover; the supporting ribs ensure the stability of the shell structure, enabling the lighting system to operate stably in a high humidity and heat environment. Compared with traditional lighting systems, it has further improved in terms of heat dissipation and anti-fogging, and has optimized and improved the existing technology. Example 3

[0043] Reference Figure 7 The difference between this embodiment and Embodiment 1 or Embodiment 2 is that the lamp bead 3 includes a first lamp bead 31 and a second lamp bead 32. The first lamp bead 31 is arranged on the first heat dissipation wall 21, and the second lamp bead 32 is arranged on the second heat dissipation wall 22. The housing 1 is provided with a human body sensor 7 for sensing the distance between a human body and the lamp bead 3. The human body sensor 7 is an infrared distance sensor and is installed on the outer wall 11 of the housing 1. The human body sensor 7, the first lamp bead 31 and the second lamp bead 32 are electrically connected to the control unit 8 of the lighting system.

[0044] Reference Figure 7The control unit 8 adjusts the brightness of the first LED bead 31 and the second LED bead 32 according to the distance detected by the human body sensor 7: when the distance to the human body is greater than the preset far distance threshold, such as 2m, the brightness of the second LED bead 32 is increased and the brightness of the first LED bead 31 is decreased; when the distance to the human body is less than the preset near distance threshold, such as 0.5m, the brightness of the first LED bead 31 is increased and the brightness of the second LED bead 32 is decreased.

[0045] Reference Figure 7 When a person is far from the light fixture, concentrated light is needed to illuminate the distant area. At this time, the control unit 8 brightens the second LED 32 to form a narrow beam of illumination similar to a downlight. The light is concentrated and has a long range, while reducing the loss of scattered light. Since the second LED 32 generates concentrated heat, the airflow mode of the cooling fan 5 and the baffle 6 is switched to a high-temperature, high-heat-dissipation mode to ensure that the heat from the second heat dissipation wall 22 is carried away in time. When a person is close to the light fixture, broad and soft near-field illumination is needed to avoid glare. The control unit brightens the first LED 31, and the light is evenly scattered from all sides, providing a large and soft illumination area. At this time, the first LED 31 is distributed on a large annular area with a low heat flux density, and the system can maintain an anti-condensation mode or a low-speed heat dissipation mode. Through this distance-adaptive lighting mode switching, not only is the user experience optimized, but the spatial dynamic distribution of heat dissipation load is also realized, further improving the overall reliability and energy efficiency of the system.

[0046] The implementation principle of this embodiment is as follows: the human body sensor and control unit can intelligently adjust the lighting brightness according to the human body position to improve energy utilization efficiency; the hydrophilic anti-fog coating further improves the anti-fog effect; through intelligent adjustment of lighting brightness and anti-fog design, the lighting system can meet lighting needs while being more energy-efficient and environmentally friendly, and has a significant improvement in intelligence and anti-fog performance compared with traditional lighting systems.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the technical solutions of the embodiments of this application.

Claims

1. A lighting system suitable for high humidity and heat environments, characterized in that, include: The shell (1) has a cylindrical structure; The heat dissipation substrate (2) is disposed inside the housing (1) and has a first heat dissipation wall (21) in the form of a ring and a second heat dissipation wall (22) formed in the middle of the first heat dissipation wall (21) and in the form of a cylindrical structure. A first ventilation channel (23) is formed inside the second heat dissipation wall (22). The LED (3) is thermally coupled to the first heat dissipation wall (21) and the second heat dissipation wall (22); A light-transmitting cover (4) is fixed to the lower end of the housing (1) and forms a closed space with the heat dissipation substrate (2) to accommodate the lamp beads (3). A cooling fan (5) is disposed above the housing (1) for dissipating heat from the heat dissipation substrate (2); A baffle plate (6) is rotatably connected to the air outlet end of the first ventilation duct (23) and forms a lateral air outlet (61) with the first ventilation duct (23); a plurality of air vents (62) are provided on the baffle plate (6); a blade (63) is provided at the air vent (62), and the blade (63) is connected to the baffle plate (6) by a bimetallic strip (64); The bimetallic strip (64) is configured such that when the temperature of the airflow in the first ventilation duct (23) is not greater than a preset temperature, the blade (63) is kept in a state of blocking the air vent (62), so that the airflow cannot drive the body of the baffle (6) to rotate, so as to guide the airflow in the first ventilation duct (23) to blow laterally on the bottom wall of the light-transmitting cover (4); when the temperature of the airflow in the first ventilation duct (23) is greater than the preset temperature, the bimetallic strip (64) thermally deforms and drives the blade (63) to shift to a state of opening the air vent (62), so as to reduce the flow resistance in the first ventilation duct (23), thereby increasing the flow rate of the airflow inside the first ventilation duct (23), and the shifted blade (63) can drive the baffle (6) to rotate under the push of the airflow and generate a vortex in the first ventilation duct (23).

2. The lighting system suitable for high humidity and heat environments according to claim 1, characterized in that, The wind deflector (6) has several ventilation openings (62) evenly distributed circumferentially, and the total area of ​​the ventilation openings (62) accounts for 30% to 60% of the total area of ​​the wind deflector (6).

3. The lighting system suitable for high humidity and heat environments according to claim 2, characterized in that, The upper end of the wind deflector (6) has several vertically arranged baffles (65) evenly distributed along the circumference, and the baffles (65) extend into the first ventilation duct (23).

4. The lighting system suitable for high humidity and heat environments according to claim 1, characterized in that, The bimetallic strip (64) is composed of two metal strips with different coefficients of thermal expansion, with the metal strip with the lower coefficient of thermal expansion arranged on the side closer to the blade (63).

5. The lighting system suitable for high humidity and heat environments according to claim 1, characterized in that, The housing (1) has a double-layer structure, with an outer wall (11) and an inner wall (12); a second ventilation channel (13) is formed between the outer wall (11) and the inner wall (12); the outer wall (11) of the housing (1) extends upward and beyond the heat dissipation substrate (2), and a bent windbreak part (111) is formed at the top of the outer wall (11) to guide part of the airflow to blow towards the side wall of the light-transmitting cover (4).

6. The lighting system suitable for high humidity and heat environments according to claim 5, characterized in that, A number of vertically arranged support ribs (14) are provided between the outer wall (11) and the inner wall (12).

7. The lighting system suitable for high humidity and heat environments according to claim 1, characterized in that, The lamp bead (3) includes a first lamp bead (31) and a second lamp bead (32). The first lamp bead (31) is arranged on the first heat dissipation wall (21), and the second lamp bead (32) is arranged on the second heat dissipation wall (22). The housing (1) is provided with a human body sensor (7) for sensing the distance between the human body and the lamp bead (3). The human body sensor (7), the first lamp bead (31) and the second lamp bead (32) are electrically connected to the control unit (8) of the lighting system.

8. The lighting system suitable for high humidity and heat environments according to claim 7, characterized in that, The control unit (8) adjusts the brightness of the first lamp bead (31) and the second lamp bead (32) according to the distance detected by the human body sensor (7): when the distance to the human body is greater than the preset far distance threshold, the brightness of the second lamp bead (32) is increased and the brightness of the first lamp bead (31) is decreased; when the distance to the human body is less than the preset near distance threshold, the brightness of the first lamp bead (31) is increased and the brightness of the second lamp bead (32) is decreased.

9. The lighting system suitable for high humidity and heat environments according to claim 7, characterized in that, The human body sensor (7) is an infrared ranging sensor, an ultrasonic sensor or a microwave radar sensor, and is installed on the outer wall (11) of the housing (1).

10. The lighting system suitable for high humidity and heat environments according to claim 1, characterized in that, The outer wall (11) of the light-transmitting cover (4) is coated with a hydrophilic anti-fog coating.

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