A monitoring camera with automatic defogging function

Abstract

The application provides a monitoring camera with an automatic defogging function, and belongs to the technical field of cameras. The monitoring camera comprises a shell body and an end cover. The end cover is detachably connected with the shell body. The end cover structure comprises a mounting frame and a mounting plate. A heat preservation plate is arranged at one end of the mounting plate away from the shell body. A monitoring module and a heat insulation ring are arranged at the other end of the mounting plate. The monitoring module comprises a control mainboard, an illumination module and an image acquisition module. The monitoring module is located in the heat insulation ring. Heating wires are arranged in the heat preservation plate. A heat dissipation assembly is arranged on the shell body. The heat dissipation assembly comprises a heat dissipation block, heat dissipation fins and a heat conduction plate. The heat dissipation block is located in the shell body. The heat dissipation fins are arranged at one end of the shell body away from the end cover and are in contact with the heat dissipation block. The heat conduction plate is located at one end of the heat dissipation block close to the control mainboard. A phase change temperature adjusting structure is arranged in the heat dissipation block. The phase change temperature adjusting structure comprises a phase change cavity formed in the heat dissipation block. The device can realize heating and defogging through the cooperative arrangement of the heating wires and the heat dissipation assembly.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of camera, more particularly, it relates to a monitoring camera with automatic defogging function. BACKGROUND

[0002] In the field of monitoring, it is often necessary to use a monitoring camera for environmental monitoring and data acquisition. For example, in outdoor security monitoring, in order to master the activities of personnel, vehicles, etc. in the monitoring area, the monitoring camera often works uninterruptedly for 24 hours. At this time, it is necessary to use the monitoring camera to realize all-around and long-time monitoring of the monitoring area, so as to discover abnormal conditions in time and take corresponding measures.

[0003] However, in some special environments, such as areas with high humidity and obvious day-night temperature difference, environmental factors often cause fog on the surface of the lens, making the monitoring picture unclear. Although the traditional monitoring camera has an automatic defogging function, it often only focuses on the rapid dispersion of the fog on the surface of the lens, and does not pay attention to the internal temperature insulation. This makes the internal heat of the device easy to dissipate, and when the external environment temperature is low, even if the fog on the surface of the lens is temporarily removed, due to the lack of internal temperature insulation structure, the lens temperature will soon be affected by the low temperature environment, and the water vapor will condense on the surface of the lens again, making the defogging effect difficult to last. SUMMARY

[0004] In order to solve the above technical problems, the present application provides a monitoring camera with automatic defogging function, to solve the technical problems of the monitoring camera in the prior art, that is, the lens is easy to fog in special environments (such as areas with high humidity and large temperature difference), resulting in blurred monitoring picture and decreased image quality.

[0005] The purpose and effect of the monitoring camera with automatic defogging function of the present application are achieved by the following specific technical means:

[0006] A monitoring camera with automatic defogging function, comprising a shell body and an end cover, the end cover is detachably connected with the shell body, the end cover structure comprises a mounting frame and a mounting plate, the mounting plate is provided with a heat preservation plate for isolating the external temperature at one end away from the shell body, the other end of the mounting plate is provided with a monitoring module and a heat insulation ring, the monitoring module comprises a control mainboard, an illumination module and an image acquisition module, the monitoring module is located in the heat insulation ring, and the heat insulation ring is used to isolate the influence of the internal heat source on the lens;

[0007] The heat preservation plate is provided with a heating wire, the heating wire is distributed circumferentially along the edge of the mounting plate and the lens of the image acquisition module, and the heating wire is electrically connected with the control mainboard;

[0008] The shell body is provided with a heat dissipation assembly, which comprises a heat dissipation block, heat dissipation fins and a heat conduction plate. The heat dissipation block is located in the shell body, the heat dissipation fins are installed at an end of the shell body away from the end cover and in contact with the heat dissipation block, and the heat conduction plate is located at an end of the heat dissipation block close to the control mainboard.

[0009] The heat dissipation block is provided with a phase change temperature adjusting structure, which comprises a phase change cavity formed in the heat dissipation block.

[0010] According to a preferred embodiment, the heat preservation plate is of a composite structure, comprising a first heat insulation layer and a heating layer. One end of the first heat insulation layer is in contact with the mounting plate, and the other end is connected to the heating layer through a bonding layer. The bonding layer is made of epoxy resin.

[0011] The first heat insulation layer is of a closed cavity structure and is made of polycarbonate. A heat insulation cavity is formed in the first heat insulation layer, which is filled with nitrogen. The heat insulation cavity is used to isolate the transmission of external low temperature to the mounting plate through low thermal conductivity gas.

[0012] The heating layer is a polyimide film, and the heating wire is inlaid in the heating layer. The heating layer is used to generate heat through the heating wire and uniformly transmit it to the peripheral area of the lens to avoid water mist condensation on the surface of the lens due to temperature difference, thereby realizing the automatic defogging function.

[0013] The heat preservation plate is fixed to the mounting frame by bolts, and a sealing ring is arranged at the connection position to prevent water vapor from penetrating.

[0014] According to a preferred embodiment, the end cover is provided with a temperature control assembly for triggering and regulating the heating wire. The temperature control assembly comprises a sensor group and a temperature control module. The temperature control module is electrically connected to the control mainboard.

[0015] The sensor group comprises a temperature sensor, a humidity sensor and a temperature monitoring line. The temperature sensor is installed on the surface of the lens frame of the image acquisition module through heat-conducting glue. The humidity sensor is embedded in the edge groove of the mounting frame. The temperature monitoring line is inlaid in the heating layer in parallel with the heating wire. The temperature sensor, the humidity sensor and the temperature monitoring line are all electrically connected to the control mainboard.

[0016] According to a preferred embodiment, the heat insulation ring comprises a main body and a cover. The monitoring module is installed in the main body, and the cover is detachably connected to the main body. A light-transmitting lens is clamped in the cover.

[0017] The heat-conducting plate is located in the heat-insulating ring and in contact with the control mainboard and the inner wall of the heat-insulating ring, the connection part of the main body and the cover is embedded with a silicon rubber sealing strip, and the cover is provided with a placing groove for placing the image acquisition module and the illumination module.

[0018] According to a preferred embodiment, the heat-insulating ring is a composite multi-layer annular cavity structure, sequentially comprising a heat-conducting inner layer, a second heat-insulating layer and a sealing outer layer from inside to outside;

[0019] The heat-conducting inner layer is an aluminum alloy sheet, the second heat-insulating layer is an annular aerogel felt, and the sealing outer layer is a silicon rubber annular sleeve, wherein a sealing protrusion is arranged on the silicon rubber annular sleeve, and the silicon rubber annular sleeve is clamped in the mounting frame through the sealing protrusion.

[0020] According to a preferred embodiment, the heat-dissipating assembly further comprises a heat-conducting column, which is arranged in the heat-dissipating block, one end of the heat-conducting column extends out of the heat-dissipating block and is connected with the heat-conducting plate, and the other end of the heat-conducting column extends out of the heat-dissipating block and is connected with the heat-dissipating fin;

[0021] The phase change temperature adjusting structure further comprises a liquid absorbing core and a powder sintering layer arranged on the inner wall of the phase change cavity, the liquid absorbing core is located in the phase change cavity, and the liquid absorbing core is connected with the inside of the phase change cavity through the powder sintering layer.

[0022] According to a preferred embodiment, a spiral powder sintering belt is arranged on the heat-conducting column, the spiral powder sintering belt extends in an equal-pitch spiral along the axial direction of the heat-conducting column, the starting end of the spiral powder sintering belt penetrates through the powder sintering layer and extends to the inside of the heat-dissipating block, and the extension section of the spiral powder sintering belt is located in the heat-dissipating block, thereby forming a continuous capillary transmission path from the phase change cavity to the inside of the heat-dissipating block.

[0023] According to a preferred embodiment, a heat exchange cavity is formed between the heat-dissipating fin and the inner wall of the rear end cover of the metal shell in the internal space of the shell body;

[0024] A plurality of groups of capillary tubes are arranged in the heat exchange cavity, one end of each capillary tube is open and arranged on the metal shell, and the other end is located on one side of the heat-dissipating fin, the capillary tube structure comprises a spiral tube and straight tubes arranged at both ends of the spiral tube, the diameter of the straight tube is greater than that of the spiral tube, and the capillary tube is used for realizing natural circulation and convective heat exchange of air through the heat siphon effect.

[0025] According to a preferred embodiment, a protective cover is arranged on the metal shell, and two groups of air exchange plates for realizing air exchange and heat transfer are arranged between the metal shell and the protective cover;

[0026] The ventilation plate is provided with a breathable film, and two groups of the ventilation plates are arranged in parallel at both ends of the metal shell and the protective cover.

[0027] According to a preferred embodiment, the rear end cover of the shell body is provided with a protective cover and a wiring board, the wiring board is located in the protective cover, and the wiring board is electrically connected with the control mainboard.

[0028] Compared with the prior art, the present application has the following beneficial effects:

[0029] 1、The present application can realize targeted heating and demisting through the cooperative arrangement of the distribution of heating wires and the heat dissipation assembly. The heating wires are distributed along the edge of the mounting plate and the lens of the image acquisition module in a circumferential direction, and are matched with a temperature sensor (for monitoring the temperature of the lens), a humidity sensor (for monitoring the environmental humidity), and a temperature monitoring line (for feeding back the temperature of the heating area). The control mainboard can analyze the temperature and humidity difference between the lens surface and the environment, and adjust the power output of the heating wires. This arrangement improves the demisting efficiency of the device, prolongs the service life of the lens while ensuring the demisting effect, and improves the stable demisting ability of the device in complex temperature and humidity environments.

[0030] 2、When using the device, the device can isolate the interference of internal and external heat sources on the lens through the composite multi-layer annular cavity structure of the heat insulation ring. The heat insulation ring has a heat conduction inner layer (aluminum alloy sheet, quickly conducts local heat), a second heat insulation layer (annular aerogel felt, low thermal conductivity to block the heat of internal heat sources), and a sealing outer layer (silicone rubber annular sleeve, prevents external water vapor from penetrating in), which can not only avoid the heat conduction of internal elements such as the control mainboard and the lighting module to the lens, but also reduce the direct influence of external low temperature on the lens. This arrangement improves the temperature isolation ability of the device, and then, through the cooperation of the silicone rubber sealing strip and the sealing protrusion, the sealing property of the heat insulation ring is further enhanced, so that the device can stably maintain the temperature balance around the lens, reduce the condensation of fog caused by excessive temperature difference between the inside and outside, and improve the anti-fog basic ability of the device.

[0031] 3、The present application is integrated with the phase change temperature regulating structure and the heat dissipation assembly, so that the device can realize internal temperature regulation and heat dissipation. The phase change temperature regulating structure (phase change cavity, liquid absorption core and powder sintering layer) can buffer the internal temperature fluctuation through the heat absorption / heat release characteristics of the phase change material, cooperate with the heat dissipation block, heat dissipation fin and heat conduction plate to quickly export the heat of the control mainboard and other elements; at the same time, the capillary in the heat exchange cavity realizes air natural circulation convection through the heat siphon effect, and enhances the heat dissipation efficiency. This setting improves the temperature stability of the device, and the device can avoid the abnormal temperature rise of the lens periphery caused by the heating of the internal elements through the combination of phase change temperature regulation and active heat dissipation, so that the device can maintain the dynamic balance of internal and external temperature in low temperature environment, reduce the temperature and humidity conditions of fog generation, and improve the environmental adaptability and fog removal persistence of the device in long time work. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a structural schematic diagram of the monitoring camera of the present application;

[0033] Figure 2 is a structural schematic diagram of the monitoring camera of the present application;

[0034] Figure 3 is a structural schematic diagram of the monitoring camera of the present application; Figure 2 is an enlarged view of the a area in the above figure;

[0035] Figure 4 is a structural schematic diagram of the end cover and the heat dissipation block of the present application;

[0036] Figure 5 is an enlarged view of the b area in the above figure; Figure 4

[0037] is a structural schematic diagram of the heat preservation plate of the present application; Figure 6

[0038] is a front view of the monitoring camera of the present application; Figure 7

[0039] is a structural schematic diagram of the monitoring module of the present application; Figure 8

[0040] is an enlarged view of the c area in the above figure; Figure 9 Figure 8 is a structural schematic diagram of the end cover of the present application;

[0041] Figure 10 is a structural schematic diagram of the heating layer of the present application;

[0042] Figure 11 is a principle framework diagram of the present application.

[0043] Figure 12

[0044] ​​In the diagram, the correspondence between component names and their corresponding reference numerals is as follows:

[0045] 11. Outer shell; 12. Mounting frame; 13. Mounting plate; 14. First insulation layer; 15. Heating layer; 16. Bonding layer; 17. Insulation cavity; 18. Heating wire; 19. Control main board; 21. Lighting module; 22. Image acquisition module; 23. Main body; 24. Cover; 25. Light transmission mirror; 26. Heat sink; 27. Heat dissipation fins; 28. Heat conduction plate; 29. ​​Liquid absorption core; 31. Powder sintering layer; 32. Spiral powder sintering belt; 33. Temperature control module; 34. Temperature sensor; 35. Humidity sensor; 36. Temperature monitoring line; 37. Inner heat conduction layer; 38. Second insulation layer; 39. Outer sealing layer; 41. Sealing protrusion; 42. Heat conduction column; 43. Heat exchange cavity; 44. Capillary tube; 45. Protective cover; 46. Ventilation plate; 47. Breathable membrane; 48. Protective cover; 49. Terminal block. Detailed Implementation

[0046] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the technical solutions of the present invention, but should not be used to limit the scope of protection of the present invention.

[0047] Example:

[0048] like Figures 1 to 12 As shown, the present invention provides a surveillance camera with automatic defogging function, including a housing body 11 and an end cover. The end cover and the housing body 11 are detachably connected, which facilitates the installation, maintenance and replacement of internal components of the device.

[0049] The end cap structure includes a mounting frame 12 and a mounting plate 13. The mounting plate 13 has an insulation plate at one end away from the outer shell 11 for isolating external temperature. The other end of the mounting plate 13 has a monitoring module and a heat insulation ring. The monitoring module includes a control main board 19, an illumination module 21, and an image acquisition module 22. The monitoring module is located inside the heat insulation ring, which is used to isolate the influence of internal heat sources on the lens. The illumination module 21 can use LUXEON Rebel LED beads. The image acquisition module 22 can use an IMX415 image sensor.

[0050] In real-world applications, external temperatures fluctuate significantly. Based on the principle of heat conduction, the insulation board utilizes its low thermal conductivity to create a thermal barrier between the end cap and the external environment. This reduces the impact of low external temperatures on the heat transfer of internal components, prevents condensation on the surfaces of components such as lenses due to temperature differences, and creates a relatively stable thermal environment for the internal components.

[0051] The monitoring module is placed in the heat insulation ring. The heat insulation ring is isolated from the heat generated by the monitoring module based on the heat transfer barrier principle through the heat insulation material and structural design, prevents the lens from causing local temperature changes due to internal heat sources, avoids the lens surface from forming fog due to temperature difference, ensures that the lens working temperature is appropriate, and guarantees the image acquisition quality.

[0052] The heat wire 18 is arranged in the heat preservation plate, and the heat wire 18 is distributed along the edge of the mounting plate 13 and the lens of the image acquisition module 22 in a circumferential direction. The heat wire 18 is electrically connected with the control mainboard 19.

[0053] The heat wire 18 is embedded in the heat preservation plate, and the heat wire 18 is arranged to adjust the temperature of the heat preservation plate and the surrounding area by using the heat generated by the heat wire 18. The heat preservation plate is an important component for maintaining the internal temperature of the camera stable, and can make the heat dissipate in the edge area of the heat preservation plate and prevent the low temperature from the outside invading from the edge. The heat wire 18 can be distributed in a circumferential direction of the lens, so that the lens periphery can be directly heated, the temperature of the lens surface is ensured to be uniform, and the water vapor is prevented from condensing into fog on the lens surface due to temperature difference. The heat wire 18 can be a KS-20 type heat wire.

[0054] The heat wire 18 is electrically connected with the control mainboard 19 through a conductive line. Based on the acquisition data of the sensor group, the acquisition data is input to the control mainboard 19, the control mainboard 19 outputs a control signal based on the acquisition data, and the heat wire 18 adjusts the temperature based on the control signal. The control mainboard 19 can be an RV1126 type control mainboard.

[0055] The housing body 11 is provided with a heat dissipation assembly, and the heat dissipation assembly includes a heat dissipation block 26, heat dissipation fins 27 and a heat conduction plate 28. The heat dissipation block 26 is located in the housing body 11, the heat dissipation fins 27 are installed at an end of the housing body 11 away from the end cover and in contact with the heat dissipation block 26, and the heat conduction plate 28 is located at an end of the heat dissipation block 26 close to the control mainboard 19.

[0056] The heat dissipation block 26 is located in the housing body 11 and is made of copper or aluminum alloy, which has good heat conduction performance. When the monitoring camera works, the heat generated by the control mainboard 19 and other elements will be quickly absorbed by the heat dissipation block 26. The heat dissipation block 26 can temporarily store the absorbed heat by virtue of its sufficient volume and surface area, so as to balance the internal temperature and prevent the temperature of the local area from being too high.

[0057] The heat dissipation fins 27 are installed at an end of the housing body 11 away from the end cover and in contact with the heat dissipation block 26. The heat dissipation fins 27 are in the form of thin sheets and in a sufficient number, so as to increase the contact area with air. When the heat is transferred from the heat dissipation block 26, the heat dissipation fins 27 dissipate the heat to the surrounding environment by means of the principle of natural convection of air.

[0058] The heat-conducting plate 28 is located at the end of the heat sink 26 near the control motherboard 19 and is made of a material with extremely high thermal conductivity. One side of the heat-conducting plate 28 is attached to the heat-generating area of ​​the control motherboard 19, and the other side is connected to the heat sink 26, forming a heat conduction channel between the two, which can transfer the heat generated by the control motherboard 19 to the heat sink 26.

[0059] The heat sink 26 incorporates a phase-change temperature regulation structure, which includes a phase-change cavity formed within the heat sink 26. During operation, the monitoring module generates heat, which is absorbed by the heat sink 26. The phase-change material filling the phase-change cavity then comes into play. As the temperature rises, the phase-change material melts from a solid to a liquid state, absorbing a large amount of heat and slowing down the temperature rise of the heat sink 26. As the temperature decreases, the material solidifies back to a solid state, releasing heat. Through this phase-change process, the temperature of the heat sink 26 is automatically regulated, improving heat dissipation stability.

[0060] like Figures 4 to 11 As shown, the insulation board has a composite structure, including a first insulation layer 14 and a heating layer 15. One end of the first insulation layer 14 is in contact with the mounting plate 13, and the other end is connected to the heating layer 15 through a bonding layer 16, which is made of epoxy resin.

[0061] One end of the first heat insulation layer 14 is connected to the mounting plate 13, blocking the path of external low temperature transmission to the interior via the mounting plate 13. The other end is connected to the heating layer 15 via a bonding layer 16. The bonding layer 16 is made of epoxy resin, which creates adhesion between the first heat insulation layer 14 and the heating layer 15, ensuring a stable bond. Furthermore, the chemical stability of the epoxy resin prevents chemical corrosion, protecting the heating layer 15; its insulation prevents current leakage, maintaining the normal operation of the heating layer 15's circuitry. In this way, the insulation board, through the first heat insulation layer 14 blocking low temperatures and the heating layer 15 regulating the temperature, prevents the lens from fogging due to temperature differences, ensuring the stable operation of the surveillance camera.

[0062] The first heat insulation layer 14 is a closed cavity structure. The first heat insulation layer 14 is made of polycarbonate and has a heat insulation cavity 17 inside. The heat insulation cavity 17 is filled with nitrogen gas and is used to isolate the external low temperature from the mounting plate 13 through a low thermal conductivity gas.

[0063] The first insulation layer 14 adopts a closed cavity structure design and is made of polycarbonate. Polycarbonate has good moldability and mechanical properties, which can ensure the stability of the closed cavity structure.

[0064] Inside the first insulation layer 14, insulation cavities 17 are formed. These insulation cavities 17 are filled with nitrogen gas, which has a low thermal conductivity and is an ideal insulation medium. When the external low temperature attempts to be transferred to the mounting plate 13 through the insulation board, the nitrogen gas in the insulation cavity 17 slows down the heat transfer rate due to its low thermal conductivity.

[0065] This arrangement reduces the influence of low temperature outside on the mounting plate 13, creates a relatively stable temperature environment for the mounting plate 13 and internal components, further enhances the heat insulation performance of the heat insulation plate, reduces the possibility of lens fogging due to temperature changes, and ensures reliable operation of the monitoring camera under different environmental temperatures.

[0066] The heating layer 15 is a polyimide film, and the heating wire 18 is embedded in the heating layer 15. The heating layer 15 is used to generate heat through the heating wire 18 and uniformly transmit to the peripheral area of the lens, so as to avoid condensation of water mist on the surface of the lens due to temperature difference and achieve the automatic defogging function.

[0067] The heating layer 15 is composed of a polyimide film, which has high temperature resistance, flexibility and electrical insulation. The heating wire 18 is embedded in the polyimide film to form a whole.

[0068] When the heating wire 18 is powered on, based on Joule's law, the current generates heat through the resistance. The polyimide film has good heat conduction performance and flexibility, which can uniformly transmit the heat generated by the heating wire 18 to the peripheral area of the lens. Since the lens works in a complex environment, it is easy to condense water mist on the surface due to temperature difference, which affects the imaging quality. The heat uniformly transmitted by the heating layer 15 makes the temperature of the peripheral area of the lens rise, reduces the temperature difference with the outside environment, thereby avoiding the condensation of water mist on the surface of the lens due to temperature difference, automatically achieving the defogging function, and ensuring that the monitoring camera always provides clear images.

[0069] The heat insulation plate is fixed to the mounting frame 12 by bolts, and a sealing ring is arranged at the connection position to prevent water vapor from entering.

[0070] The end cover is provided with a temperature control assembly for triggering and controlling the heating wire 18. The temperature control assembly includes a sensor group and a temperature control module 33, and the temperature control module 33 is electrically connected with the control mainboard 19. The temperature control module 33 can adopt a MAX6575 type temperature control module.

[0071] The sensor group includes a temperature sensor 34, a humidity sensor 35 and a temperature monitoring line 36. The temperature sensor 34 is installed on the surface of the lens frame of the image acquisition module 22 through heat-conducting glue, the humidity sensor 35 is embedded in the edge groove of the mounting frame 12, and the temperature monitoring line 36 is embedded in the heating layer 15 in parallel with the heating wire 18. The temperature sensor 34, the humidity sensor 35 and the temperature monitoring line 36 are all electrically connected with the control mainboard 19.

[0072] The temperature sensor 34 is fixed on the surface of the lens frame of the image acquisition module 22 by means of heat-conducting glue. The heat-conducting glue not only ensures the stable installation of the temperature sensor 34, but also can transfer the heat of the lens, so that the temperature sensor 34 can perceive the real-time temperature of the surface of the lens. The temperature sensor 34 can be a TMP36 type temperature sensor; the humidity sensor 35 can be a SHT31 type humidity sensor; and the temperature monitoring wire 36 can be a Kevlar reinforced thermocouple wire.

[0073] The humidity sensor 35 is embedded in the edge groove of the mounting frame 12. Such a layout enables the humidity sensor 35 to measure the humidity of the environment around the camera.

[0074] The temperature monitoring wire 36 is embedded in the heating layer 15 in parallel with the heating wire 18, and can monitor the temperature change of the heating layer 15 to provide data for controlling the temperature output of the heating wire 18.

[0075] The three components, i.e. the temperature sensor 34, the humidity sensor 35 and the temperature monitoring wire 36, are electrically connected to the control mainboard 19 through conductive wires. In this way, the lens temperature, the environmental humidity and the heating layer 15 temperature data collected by them can be transmitted to the control mainboard 19 in a timely manner, so that the control mainboard 19 can analyze and process these data, and then regulate and control the working state of the heating wire 18 to realize the control of the lens defogging function.

[0076] Specifically, as shown in the following table:

[0077] The control mainboard 19 predefines the temperature and humidity thresholds of the lens fogging. When the temperature sensor 34 detects that the temperature of the surface of the lens is lower than 20℃, and the humidity sensor 35 measures that the environmental humidity is higher than 60%RH (relative humidity), the control mainboard 19 determines that the lens has a risk of fogging. At this time, the control mainboard 19 refers to the current temperature of the heating layer 15 fed back by the temperature monitoring wire 36, and if the temperature of the heating layer 15 is lower than 40℃, it will issue an instruction to increase the power supply voltage of the heating wire 18, so as to increase the power, speed up the heat production, and raise the temperature around the lens to prevent the condensation of fog. With the temperature of the heating layer 15 rising, when the temperature monitoring wire 36 feeds back that the temperature reaches 45℃, the control mainboard 19 reduces the power supply voltage of the heating wire 18 to reduce the heat production and maintain the appropriate temperature to avoid excessive heating. The specific values can be adjusted according to the actual situation.

[0078] As shown in the following table: Figures 2 to 11 The heat insulation ring includes a main body 23 and a cover 24, the monitoring module is installed in the main body 23, the cover 24 is detachably connected with the main body 23, and a light-transmitting lens 25 is clamped in the cover 24.

[0079] The main body 23 plays a protective and supporting role and stabilizes the module operating environment by virtue of the heat insulation feature. The cover 24 is detachably connected with the main body 23, facilitating equipment installation and maintenance. The cover 24 is provided with a clamping groove, and the light transmission lens 25 is clamped in the clamping groove, which not only ensures the light incidence for the monitoring module to form an image, but also strengthens the heat insulation and resists external interference. The heat insulation ring and the heat preservation plate work in coordination to jointly ensure the stable operation of the monitoring equipment. The heat insulation ring focuses on reducing the direct influence of the external temperature on the monitoring module from the overall structure, while the heat preservation plate focuses on temperature regulation in the lens area. The two work in coordination to ensure that the monitoring module works in a suitable temperature environment, improve the imaging quality, and prolong the service life of the equipment.

[0080] The heat conduction plate 28 is located in the heat insulation ring and is in contact with the control mainboard 19 and the inner wall of the heat insulation ring. The connection between the main body 23 and the cover 24 is embedded with a silicone rubber sealing strip, and the cover 24 is provided with a placement groove for placing the image acquisition module 22 and the lighting module 21.

[0081] The heat conduction plate 28 is located in the heat insulation ring and is in contact with the control mainboard 19 and the inner wall of the heat insulation ring. This layout enables the heat conduction plate 28 to conduct the heat generated by the operation of the control mainboard 19 to the inner wall of the heat insulation ring, thereby dispersing the heat by means of the heat insulation ring, avoiding local overheating of the control mainboard 19, and ensuring its stable operation.

[0082] The connection between the main body 23 and the cover 24 is embedded with a silicone rubber sealing strip. The silicone rubber sealing strip has good flexibility, sealing performance and temperature resistance. It can fill the gap between the main body 23 and the cover 24, prevent external air, dust and moisture from entering the inside of the heat insulation ring, and interfere with the normal work of the monitoring module and other equipment, while further enhancing the heat insulation effect.

[0083] The placement groove realizes the spatial isolation of the image acquisition module 22 and the lighting module 21, avoiding the interference of the heat and light scattering generated by the operation of the lighting module 21 on the image acquisition module 22. Through reasonable layout planning, not only the installation and fixation of each module are facilitated, but also the light emitted by the lighting module 21 can be projected at a suitable angle to the monitoring area, while the image acquisition module 22 captures the required picture, so that the monitoring equipment can obtain the information of the monitoring area.

[0084] The heat insulation ring is a composite multi-layer annular cavity structure, including a heat conduction inner layer 37, a second heat insulation layer 38 and a sealing outer layer 39 from inside to outside.

[0085] The heat conduction inner layer 37 is adjacent to the monitoring module and absorbs the heat generated by the operation of the equipment by virtue of good heat conduction performance. The second heat insulation layer 38 is between the heat conduction inner layer 37 and the sealing outer layer 39 and has high heat insulation capacity, which can effectively block the further diffusion of heat outward, reduce the loss of internal heat to the external environment, and also reduce the influence of external temperature on the internal equipment.

[0086] The sealing outer layer 39 is located at the outermost side, and mainly functions to prevent external water vapor, dust and other pollutants from entering the inside of the heat insulation ring, to protect the internal structure and equipment, and to maintain the stability of the overall performance of the heat insulation ring.

[0087] The heat-conducting inner layer 37 is an aluminum alloy sheet, the second heat insulation layer 38 is a ring-shaped aerogel felt, and the sealing outer layer 39 is a ring-shaped silicone rubber sleeve, which is provided with a sealing protrusion 41 and is clamped in the mounting frame 12 through the sealing protrusion 41.

[0088] The good heat conductivity of the aluminum alloy enables it to absorb the heat generated by the monitoring module and efficiently transfer it away.

[0089] The second heat insulation layer 38 in the middle is a ring-shaped aerogel felt. The aerogel felt has a low thermal conductivity and can play a key role in preventing heat transfer, reducing the emission of internal heat to the outside, and resisting the influence of external temperature on the inside.

[0090] The sealing outer layer 39 at the outermost side is a ring-shaped silicone rubber sleeve, which not only provides physical protection but also has excellent sealing performance. The ring-shaped silicone rubber sleeve is provided with a sealing protrusion 41, and by virtue of this structure, the ring-shaped silicone rubber sleeve can be clamped in the mounting frame 12, preventing external water vapor, dust and other impurities from entering the inside of the heat insulation ring, ensuring the stable operation of the internal equipment, and maintaining the overall performance and effectiveness of the heat insulation ring.

[0091] As shown in FIGS. Figure 4 , 5 , 8, the heat dissipation assembly further includes a heat-conducting column 42, which is arranged in the heat dissipation block 26, one end of the heat-conducting column 42 extends out of the heat dissipation block 26 and is connected with the heat-conducting plate 28, and the other end extends out of the heat dissipation block 26 and is connected with the heat dissipation fin 27.

[0092] Such a layout forms a heat transfer channel, so that the heat generated by the control mainboard 19 is conducted to the heat-conducting column 42 through the heat-conducting plate 28, and then transmitted to the heat dissipation fin 27 through the heat-conducting column 42, and heat dissipation is achieved through heat exchange between the heat dissipation fin 27 and the air.

[0093] The phase change temperature adjusting structure further includes a liquid absorbing core 29 and a powder sintering layer 31 arranged on the inner wall of the phase change cavity, the liquid absorbing core 29 is located in the phase change cavity, and the liquid absorbing core 29 is connected with the inside of the phase change cavity through the powder sintering layer 31.

[0094] The wick 29 is securely connected to the interior of the phase change cavity via the powder sintered layer 31. The wick 29 exhibits capillary action, enabling it to adsorb and transport the phase change material. When the phase change material undergoes a phase change, the wick 29 helps to evenly distribute heat, enhancing the stability of the phase change process and improving heat transfer efficiency. The powder sintered layer 31 ensures the wick 29 is bonded to the inner wall of the phase change cavity, maintaining structural integrity, guaranteeing the operation of the phase change temperature regulation structure, and improving the temperature regulation capability of the heat sink 26.

[0095] A spiral powder sintered strip 32 is provided on the heat-conducting column 42. The spiral powder sintered strip 32 extends in a spiral with equal pitch along the axial direction of the heat-conducting column 42. The starting end of the spiral powder sintered strip 32 passes through the powder sintered layer 31 and extends into the heat sink 26. The extended section of the spiral powder sintered strip 32 is located inside the heat sink 26, forming a continuous capillary transport path from the phase change cavity to the interior of the heat sink 26.

[0096] The spiral shape of the spiral powder sintered belt 32 increases the contact area with the phase change material. When the phase change material undergoes a phase change, such as when the liquid absorbs heat and vaporizes into a gaseous state, the spiral powder sintered belt 32 can absorb the heat it carries more efficiently and quickly transfer it to the heat sink 26, and then dissipate it through the heat sink fins 27, thereby improving the heat dissipation rate.

[0097] Relying on capillary action, the spiral powder sintering belt 32 guides the gaseous phase change material from the phase change cavity to the heat sink 26 along the spiral path. After the gaseous phase change material is liquefied again after releasing heat in the heat sink 26, it can flow back to the phase change cavity along the original path under the traction of capillary force, realizing the recycling of the phase change material and ensuring the continuous and stable heat dissipation process.

[0098] By guiding the phase change material to flow in an orderly manner within the heat sink 26, the spiral powder sintering belt 32 makes the heat distribution within the heat sink 26 more uniform, avoiding local overheating and improving the heat dissipation stability and reliability of the entire heat dissipation component.

[0099] like Figure 2 , 3 As shown in Figures 4, 5, and 8, a heat exchange cavity 43 is formed between the heat dissipation fins 27 and the inner wall of the rear end cover of the outer shell body 11 in the internal space of the outer shell body 11.

[0100] The heat dissipation fins 27 are responsible for receiving heat transferred from the heat conduction pillars 42, and their own temperature rises. The rear end cover of the outer casing 11 not only protects the internal components, but also provides a specific space for heat exchange in the heat exchange cavity 43 formed between its inner wall and the heat dissipation fins 27.

[0101] When the temperature of the heat dissipation fins 27 rises, it exchanges heat with the air inside the heat exchange chamber 43. Because hot air has a lower density, it naturally rises and approaches the inner wall of the rear end cover, while relatively cooler air replenishes the area around the heat dissipation fins 27, creating natural convection. This continuous convection process transfers heat from the heat dissipation fins 27 to the inner wall of the rear end cover, and then dissipates the heat to the surrounding environment through the outer casing 11, enhancing the heat dissipation effect and ensuring that the heat generated during operation is dissipated in a timely manner, maintaining the normal operating temperature of the internal components.

[0102] The heat exchange chamber 43 is equipped with multiple sets of capillary tubes 44. One end of the capillary tube 44 is open and installed on the outer shell body 11, and the other end is located on one side of the heat dissipation fin 27. The structure of the capillary tube 44 includes a spiral tube and straight tubes set at both ends of the spiral tube. The diameter of the straight tube is larger than the diameter of the spiral tube. The capillary tube 44 is used to realize natural air circulation convection heat exchange through thermosiphon effect.

[0103] The thermosiphon effect utilizes the density difference of fluids and gravity to achieve natural circulation convection heat transfer. When the temperature of the heat dissipation fins 27 rises, the air near the heat dissipation fins 27 expands due to heat, its density decreases, and it rises through the smaller diameter spiral tube into the larger diameter straight tube. Because the straight tube diameter increases, the air pressure decreases, allowing the hot air to flow more smoothly towards the outer casing 11 and transfer heat to the outer casing 11 through openings installed on it. Meanwhile, relatively cooler air replenishes the flow from the other side of the heat dissipation fins 27, continuously forming natural circulation convection under the combined effect of gravity and density difference. This heat exchange method, enhanced by the capillary tube 44 structure, strengthens the natural circulation convection heat transfer within the heat exchange chamber 43, improving heat dissipation efficiency and ensuring that the equipment can dissipate heat more effectively during operation, maintaining a good operating temperature environment.

[0104] The outer shell 11 is provided with a protective cover 45. Between the outer shell 11 and the protective cover 45, there are two sets of ventilation plates 46 for air exchange and heat transfer. The ventilation plates 46 are provided with breathable membranes 47. The two sets of ventilation plates 46 are arranged parallel to each other at both ends of the outer shell 11 and the protective cover 45. Multiple vents are evenly distributed on the ventilation plates 46.

[0105] The purpose is to achieve air exchange and heat transfer. These two sets of ventilation plates 46 are parallel to each other and are installed at both ends of the outer casing 11 and the protective cover 45, respectively. The ventilation plates 46 not only have multiple evenly distributed vents but also a breathable membrane 47. The breathable membrane 47 allows air to pass through for heat exchange while blocking dust, moisture, and other impurities from entering the equipment, ensuring a clean operating environment. The vents provide airflow channels, allowing air convection to form between the outer casing 11 and the protective cover 45. Hot air is exhausted from one ventilation plate 46, and cold air enters from the other, continuously circulating to accelerate heat dissipation and enhance the heat dissipation effect. The breathable membrane 47 can be made of polytetrafluoroethylene (PTFE).

[0106] The rear end cover of the outer casing 11 is provided with a protective cover 48 and a wiring board 49. The wiring board 49 is located inside the protective cover 48 and is electrically connected to the control main board 19.

[0107] The rear cover is equipped with a protective cover 48 and a terminal block 49. The terminal block 49 is housed inside the protective cover 48 and is electrically connected to the control main board 19. The protective cover 48 protects the terminal block 49 from external physical damage and corrosion from dust, moisture, etc., ensuring a stable and reliable electrical connection between the terminal block 49 and the control main board 19, and guaranteeing the normal operation of the equipment's electrical system.

[0108] The foregoing has shown and described the basic principles and main features of the present invention and its advantages. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments.

Claims

1. A surveillance camera with automatic defogging function, comprising a housing body (11) and an end cap, wherein the end cap is detachably connected to the housing body (11), characterized in that: The end cap structure includes a mounting frame (12) and a mounting plate (13). The mounting plate (13) has a heat insulation plate for isolating external temperature at one end away from the outer shell body (11). The other end of the mounting plate (13) has a monitoring module and a heat insulation ring. The monitoring module includes a control motherboard (19), a lighting module (21), and an image acquisition module (22). The monitoring module is located inside the heat insulation ring. The heat insulation ring is used to isolate the influence of internal heat sources on the lens. The insulation board is provided with a heating wire (18), which is distributed around the edge of the mounting plate (13) and the lens of the image acquisition module (22). The heating wire (18) is electrically connected to the control motherboard (19). The outer casing (11) is provided with a heat dissipation assembly, which includes a heat dissipation block (26), heat dissipation fins (27), and a heat conduction plate (28). The heat dissipation block (26) is located inside the outer casing (11). The heat dissipation fins (27) are installed on the outer casing (11) away from the end cover and are in contact with the heat dissipation block (26). The heat conduction plate (28) is located on the end of the heat dissipation block (26) close to the control motherboard (19). The heat sink (26) is provided with a phase change temperature regulation structure, which includes a phase change cavity formed inside the heat sink (26); The insulation board is a composite structure, including a first heat insulation layer (14) and a heating layer (15). One end of the first heat insulation layer (14) is in contact with the mounting plate (13), and the other end is connected to the heating layer (15) through a bonding layer (16). The bonding layer (16) is made of epoxy resin. The first heat insulation layer (14) is a closed cavity structure. The first heat insulation layer (14) is made of polycarbonate and has a heat insulation cavity (17) inside. The heat insulation cavity (17) is filled with nitrogen gas. The heat insulation cavity (17) is used to isolate the external low temperature from the mounting plate (13) through a low thermal conductivity gas. The heating layer (15) is a polyimide film, and the heating wire (18) is embedded in the heating layer (15). The heating layer (15) is used to generate heat through the heating wire (18) and evenly transfer it to the outer area of ​​the lens, so as to avoid water mist condensing on the lens surface due to temperature difference and realize the automatic defogging function. The insulation board is fixed to the mounting frame (12) by bolts, and a sealing ring is provided at the connection to prevent water vapor from seeping in. The end cap is provided with a temperature control component for triggering and regulating the heating wire (18). The temperature control component includes a sensor group and a temperature control module (33). The temperature control module (33) is electrically connected to the control motherboard (19). The sensor group includes a temperature sensor (34), a humidity sensor (35), and a temperature monitoring line (36). The temperature sensor (34) is mounted on the lens frame surface of the image acquisition module (22) with thermally conductive adhesive. The humidity sensor (35) is embedded in the edge groove of the mounting frame (12). The temperature monitoring line (36) and the heating wire (18) are embedded in the heating layer (15) in parallel. The temperature sensor (34), the humidity sensor (35), and the temperature monitoring line (36) are all electrically connected to the control motherboard (19).

2. A surveillance camera with automatic defogging function according to claim 1, characterized in that: The heat insulation ring includes a main body (23) and a cover (24). The monitoring module is installed inside the main body (23). The cover (24) is detachably connected to the main body (23). A light-transmitting lens (25) is installed inside the cover (24). The heat-conducting plate (28) is located inside the heat insulation ring and is in contact with the control main board (19) and the inner wall of the heat insulation ring. A silicone rubber sealing strip is embedded at the connection between the main body (23) and the cover (24). The cover (24) has a slot for placing the image acquisition module (22) and the lighting module (21).

3. A surveillance camera with automatic defogging function according to claim 2, characterized in that: The heat insulation ring is a composite multi-layer annular cavity structure, which includes a heat-conducting inner layer (37), a second heat insulation layer (38), and a sealing outer layer (39) from the inside to the outside. The heat-conducting inner layer (37) is an aluminum alloy sheet, the second heat insulation layer (38) is an annular aerogel felt, and the sealing outer layer (39) is a silicone rubber annular sleeve. The silicone rubber annular sleeve is provided with a sealing protrusion (41), and the silicone rubber annular sleeve is secured in the mounting frame (12) through the sealing protrusion (41).

4. A surveillance camera with automatic defogging function according to claim 3, characterized in that: The heat dissipation assembly also includes a heat-conducting column (42), which is inserted into the heat dissipation block (26). One end of the heat-conducting column (42) extends out of the heat dissipation block (26) and connects to the heat-conducting plate (28), and the other end extends out of the heat dissipation block (26) and connects to the heat dissipation fins (27). The phase change temperature regulation structure also includes a liquid-absorbing core (29) and a powder sintering layer (31) disposed on the inner wall of the phase change cavity. The liquid-absorbing core (29) is located inside the phase change cavity and is connected to the inside of the phase change cavity through the powder sintering layer (31).

5. A surveillance camera with automatic defogging function according to claim 4, characterized in that: A spiral powder sintered strip (32) is provided on the heat-conducting column (42). The spiral powder sintered strip (32) extends in a spiral with equal pitch along the axial direction of the heat-conducting column (42). The starting end of the spiral powder sintered strip (32) passes through the powder sintered layer (31) and extends into the heat sink (26). The extended section of the spiral powder sintered strip (32) is located inside the heat sink (26), forming a continuous capillary transport path from the phase change cavity to the interior of the heat sink (26).

6. A surveillance camera with automatic defogging function according to claim 5, characterized in that: In the internal space of the outer shell body (11), a heat exchange cavity (43) is formed between the heat dissipation fins (27) and the inner wall of the rear end cover of the metal shell. The heat exchange chamber (43) is provided with multiple sets of capillary tubes (44). One end of the capillary tube (44) is open and installed on the metal shell, and the other end is located on one side of the heat dissipation fin (27). The structure of the capillary tube (44) includes a spiral tube and straight tubes set at both ends of the spiral tube. The diameter of the straight tube is larger than the diameter of the spiral tube. The capillary tube (44) is used to realize natural air circulation convection heat exchange through thermosiphon effect.

7. A surveillance camera with automatic defogging function according to claim 6, characterized in that: The metal casing is provided with a protective cover (45), and two sets of ventilation plates (46) are provided between the metal casing and the protective cover (45) for realizing air exchange and heat transfer. The ventilation plate (46) is provided with a breathable membrane (47). Two sets of ventilation plates (46) are arranged parallel to each other at both ends of the metal shell and the protective cover (45). Multiple breathable holes are evenly distributed on the ventilation plate (46).

8. A surveillance camera with automatic defogging function according to claim 1, characterized in that: The rear end cover of the outer casing (11) is provided with a protective cover (48) and a wiring board (49). The wiring board (49) is located inside the protective cover (48) and is electrically connected to the control main board (19).

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