Short-wave ultraviolet high-photon energy stable radiation device

Abstract

The utility model discloses a short-wave ultraviolet high-photon energy stable radiation device, which is characterized in that a DBD light source assembly is arranged in a mounting cavity, a heat dissipation fan is embedded in an open window, and a shell is provided with heat dissipation holes; a high-voltage electrode of the DBD light source assembly is located in an air flow channel formed between the window and the heat dissipation hole. The temperature sensing unit is arranged in the mounting cavity, the ultraviolet sensing unit is arranged on the shell, and the main control assembly is used for controlling the input power of the DBD light source assembly and the rotating speed of the cooling fan according to the temperature detected by the temperature sensing unit and the irradiation intensity detected by the ultraviolet sensing unit; and the influence of overheating of a high-voltage electrode of the DBD light source assembly on the light intensity of excited ultraviolet rays is avoided.

Description

Technical Field

[0001] This utility model relates to the field of ultraviolet disinfection technology, specifically a short-wave ultraviolet high-photon energy stable radiation device. Background Technology

[0002] Dielectric barrier discharge (DBD) can be used to excite excimer lasers and generate narrowband radiation in the vacuum ultraviolet (VUV) and ultraviolet (UV) regions. Its working medium is typically generated from rare gases, halogens, rare gas-halogen combinations, and mercury-halogen complexes, with Xe2 (172nm) being a common example. Excimer ultraviolet light sources employing DBD are widely used in integrated circuit lithography, material surface modification, sterilization, thin film deposition, contamination control, and industrial cleaning.

[0003] Existing methods for ultraviolet disinfection mainly involve traditional low-pressure mercury lamps and short-wave ultraviolet disinfection based on dielectric barrier discharge (DBD). Different devices and systems adapted to various scenarios are created, focusing on the ultraviolet bands primarily emitting 254nm and 222nm, to disrupt the DNA / RNA structure of microorganisms, rendering them unable to replicate.

[0004] Due to the low photoelectric conversion efficiency and unstable radiation intensity of short-wave ultraviolet light (222nm) excited by DBD, the ultraviolet disinfection effect is not good. During the process of DBD-excited ultraviolet light, the heat release of the high-voltage electrode becomes one of the main factors affecting the intensity of the excited ultraviolet light. Summary of the Invention

[0005] Based on existing technology, the purpose of this utility model is to provide a short-wave ultraviolet high-photon energy stable radiation device to solve the heating problem of the high-voltage electrode in the DBD light source device.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A short-wave ultraviolet high-photon energy stable radiation device includes a housing, a DBD light source assembly, a sensor assembly, and a main control assembly. The DBD light source assembly is disposed within a mounting cavity in the housing. The housing has a window with a cooling fan installed inside, and a plurality of heat dissipation holes are formed therein. The window and the heat dissipation holes form an airflow channel for heat dissipation, and the high-voltage electrode of the DBD light source assembly is positioned facing the airflow channel.

[0008] The sensor assembly includes a temperature sensing unit and an ultraviolet (UV) sensing unit. The temperature sensing unit is used to detect the temperature of the high-voltage electrode of the DBD light source assembly. The UV sensing unit is used to detect the irradiance of the UV light emitted by the DBD light source assembly. The output terminals of the temperature sensing unit and the UV sensing unit are respectively connected to the input terminal of the main control assembly. The control terminal of the main control assembly is respectively connected to the DBD light source assembly and the cooling fan.

[0009] Furthermore, the DBD light source assembly includes a high-voltage electrode and a low-voltage electrode; both the high-voltage electrode and the low-voltage electrode are disposed in the mounting cavity, and the high-voltage electrode, the low-voltage electrode and the housing cooperate to form a sealed cavity for filling the medium gas.

[0010] Furthermore, the high-voltage electrode is a low-resistivity metal plate, and a nanoscale metal thin film is provided on the side of the high-voltage electrode near the sealed cavity; wherein the thickness of the metal thin film is 50-100 nm.

[0011] Furthermore, the high-voltage electrode has a heat-conducting layer on the side away from the sealed cavity.

[0012] Furthermore, the thermally conductive layer is a graphene-based composite phase change material layer.

[0013] Furthermore, a conductive plate is provided inside the mounting cavity, and the conductive plate and the shell cooperate to form a liquid storage cavity for filling with ionized water; the ionized water in the liquid storage cavity serves as a low-pressure electrode.

[0014] Furthermore, the mounting cavity contains two DBD light source assemblies, which are respectively located at both ends of the mounting cavity; the cooling fan and the airflow channel formed by several heat dissipation holes are located between the two DBD light source assemblies.

[0015] Furthermore, the housing has two through holes for housing temperature sensing units, and the detection ends of the two temperature sensing units face the high-voltage electrodes of the two DBD light source components respectively; the housing is provided with two ultraviolet sensing units, and the ultraviolet sensing units are correspondingly arranged with the sealed cavity of the DBD light source component; wherein, the temperature sensing unit is an infrared thermopile sensor; the ultraviolet sensing unit is an ultraviolet tube.

[0016] Furthermore, the main control component includes a main control module and a high-frequency inverter module. The main control module is electrically connected to the high-voltage electrode and the low-voltage electrode of the DBD light source component through the high-frequency inverter module. The high-frequency inverter module is used to convert the external power supply into AC high-voltage power supply and drive the DBD light source component to excite ultraviolet light.

[0017] Furthermore, the main control module is electrically connected to the high-frequency inverter module through a power compensation module. The power compensation module is used to dynamically adjust the output current of the high-frequency inverter module according to the irradiance detected by the ultraviolet sensor unit, so as to achieve a constant output of ultraviolet light excited by the DBD light source component.

[0018] By adopting the above technical solution, the beneficial effects of this utility model compared with the prior art are as follows:

[0019] The housing has a window and several heat dissipation holes. A cooling fan is installed in the window. The window and the several heat dissipation holes form an airflow channel for heat dissipation. The high-voltage electrode of the DBD light source component is arranged facing the airflow channel. When the cooling fan is working, it can drive air to circulate in the airflow channel to achieve heat dissipation. It can promptly remove the heat of the high-voltage electrode of the DBD light source component and prevent the high-voltage electrode of the DBD light source component from overheating and affecting the intensity of the excited ultraviolet light.

[0020] Simultaneously, the inclusion of temperature and ultraviolet sensing units allows the main control component to adjust the input power of the DBD light source assembly and the speed of the cooling fan based on the temperature detected by the temperature sensing unit and the irradiance detected by the ultraviolet sensing unit. This enables long-term continuous short-wave ultraviolet radiation, improves the photoelectric conversion efficiency and photoelectric stability of the DBD light source assembly, enhances its dynamic adjustment capability, achieves a relatively stable light intensity, avoids heat generation issues, and provides relatively higher photon energy compared to existing devices. Consequently, it is suitable for efficient sterilization in sensitive locations such as hospitals and schools, promoting the widespread adoption of mercury-free ultraviolet technology. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of the short-wave ultraviolet high-photon energy stable radiation device in the embodiment.

[0023] Figure 2 This is a schematic diagram of the internal structure of the short-wave ultraviolet high-photon energy stable radiation device in the embodiment.

[0024] Figure 3 for Figure 2 A magnified structural diagram of region A in the middle.

[0025] Figure 4 This is a schematic diagram of the system framework of the short-wave ultraviolet high-photon energy stable radiation device in the embodiment. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0027] Example 1

[0028] As shown in Figures 1 to 4, this solution provides a short-wave ultraviolet high photon energy stable radiation device, which includes a housing 1, a DBD light source assembly, a sensor assembly, and a main control assembly;

[0029] Reference Figure 1-3 As shown, the specific structure of the radiation stabilization device is as follows:

[0030] The housing 1 has a mounting cavity 13. Two DBD light source assemblies are housed within the mounting cavity 13, positioned at the upper and lower ends respectively. A window is provided on the housing 1, and a cooling fan 12 is installed within the window, located between the two DBD light source assemblies, i.e., the window is in the middle of the housing 1. Several heat dissipation holes 11 are provided on both the upper and lower sides of the window, forming an airflow channel for heat dissipation. The high-voltage electrodes 2 of the DBD light source assemblies face the airflow channel; specifically, the high-voltage electrodes 2 of the upper DBD light source assembly face downwards, and the high-voltage electrodes 2 of the lower DBD light source assembly face upwards. When the cooling fan 12 operates, it drives air to circulate within the airflow channel to dissipate heat, effectively removing heat from the high-voltage electrodes 2 of the DBD light source assemblies and preventing overheating that could affect the intensity of the excited ultraviolet light.

[0031] Preferably, the housing 1 is made of quartz glass, and the DBD light source component is disposed inside the housing 1. Using quartz glass for the housing 1 provides high ultraviolet light transmittance and compatibility with various ultraviolet wavelengths, achieving a transmittance of up to 90%, making it an excellent material for disinfection equipment. This allows the short-wave ultraviolet light emitted by the DBD light source component to pass through the housing 1, improving sterilization efficiency.

[0032] In addition, one or more DBD light source components can be deployed within the stable radiation device; the number of DBD light source components can be determined based on the disinfection of bacteria or viruses and the disinfection site.

[0033] Specifically, the DBD light source assembly uses the existing technology structure. In this embodiment, a flat electrode structure is adopted, including a high-voltage electrode 2, a low-voltage electrode 5, and a sealed cavity 3 located between the high-voltage electrode 2 and the low-voltage electrode 5. In this embodiment, the high-voltage electrode 2 and the low-voltage electrode 5 are both located in the mounting cavity 13. The high-voltage electrode 2, the low-voltage electrode 5, and the housing 1 cooperate to form a sealed cavity 3 for filling with medium gas. Thus, a complete DBD light source assembly structure is formed.

[0034] The medium gas is a rare gas, a halogen gas, or a mixture of rare and halogen gases. The rare gas is selected from at least one of He, Ar2, Xe2, and Kr2, and the halogen gas is selected from at least one of Cl2, Br2, and F2. The gas pressure inside the sealed cavity 3 is 200-400 mBar.

[0035] In this embodiment, the preferred medium gas is a mixture of Kr2 and Cl2, and the gas pressure inside the sealed cavity 3 is 300 mBar. This forms a dielectric barrier discharge (DBD) light source assembly between the low-pressure electrode 5 and the high-pressure electrode 2. The low-pressure electrode 5 and the high-pressure electrode 2 cooperate to form a sealed cavity 3. The high-frequency inverter module is electrically connected to the DBD light source assembly, thereby forming an electric field between the low-pressure electrode 5 and the high-pressure electrode 2 to excite ultraviolet light, which in turn causes the DBD light source assembly to excite 222nm ultraviolet light.

[0036] This solution uses a sealed cavity 3 containing a medium gas for exciting short-wave ultraviolet light, and forms an electric field between the low-pressure electrode 5 and the high-pressure electrode 2 to excite the medium gas to produce short-wave ultraviolet light. Due to its weak penetration and high photon energy, it avoids the risks of DNA damage and mercury pollution to the human body caused by traditional 254nm ultraviolet light, and improves sterilization efficiency.

[0037] In addition, the short-wave ultraviolet radiation band is controllable, and the band radiation selection can be implemented according to the disinfection efficiency analysis; by filling the sealed cavity 3 with different combinations of medium gases, the DBD light source component can excite short-wave ultraviolet rays of different bands.

[0038] Reference Figure 2-3 As shown, the sensor assembly includes a temperature sensing unit 6 and an ultraviolet sensing unit 7. The temperature sensing unit 6 is located inside the mounting cavity 13 and is used to detect the temperature of the high-voltage electrode 2 of the DBD light source assembly. The ultraviolet sensing unit 7 is located on the housing 1 and is used to detect the irradiance of the ultraviolet radiation emitted by the DBD light source assembly. The output terminals of the temperature sensing unit 6 and the ultraviolet sensing unit 7 are respectively connected to the input terminal of the main control assembly. The control terminal of the main control assembly is respectively connected to the DBD light source assembly and the cooling fan 12.

[0039] The main control component controls the input power of the DBD light source component and the speed of the cooling fan based on the temperature detected by the temperature sensing unit and the irradiance detected by the ultraviolet sensing unit; this enables long-term continuous short-wave ultraviolet radiation. For example, by controlling the input power of the DBD light source component, the irradiance of the output ultraviolet light from the DBD light source component is maintained within a certain range. Simultaneously, the speed of the cooling fan is controlled based on the temperature detected by the temperature sensing unit to ensure that the temperature of the high-voltage electrode 2 of the DBD light source component remains within a tolerable range. When the high-voltage electrode 2 of the DBD light source component reaches the high-temperature threshold, the ultraviolet excitation of the DBD light source component is stopped, and the high-voltage electrode 2 is continuously cooled by air cooling. When the high-voltage electrode 2 of the DBD light source component drops to the low-temperature threshold, the DBD light source component is driven to resume ultraviolet excitation.

[0040] Through the control of the air-cooling system and main control components designed above, a relatively stable light intensity is achieved, avoiding the problem of heat generation. Compared with existing devices, it will have relatively higher photon energy.

[0041] This improves the photoelectric conversion efficiency and photoelectric stability of DBD light source components, enhances their dynamic adjustment capabilities, and makes them suitable for efficient sterilization in sensitive locations such as hospitals and schools, thus promoting the widespread adoption of mercury-free ultraviolet technology.

[0042] Furthermore, the flow field within the mounting cavity 13 can be simulated and optimized using CFD (Computational Fluid Dynamics), ensuring that the cool air delivered by the cooling fan 12 is evenly distributed to the DBD light source components at both ends of the mounting cavity 13. This allows for rapid heat dissipation of the high-voltage electrodes 2 of both DBD light source components. The stable radiation device can adjust the number, size, and installation position of the cooling fans 12 according to the disinfection requirements and the actual parameters of the DBD light source components.

[0043] In addition, two through holes are provided on the housing 1 for inserting temperature sensing units 6, and the detection ends of the two temperature sensing units 6 are respectively facing the high voltage electrodes 2 of the two DBD light source components. The temperature sensing units 6 are infrared thermopile sensors MLX90614. Two ultraviolet sensing units 7 are provided on the housing 1, and the ultraviolet sensing units 7 are correspondingly arranged with the sealed cavity 3 of the DBD light source components. The ultraviolet sensing units 7 are ultraviolet tubes Hamamatsu S1226.

[0044] Among them, the infrared thermopile sensor is an infrared detector based on the Seebeck effect. This sensor is a non-contact temperature sensor. When the thermopile chip of the infrared thermopile sensor absorbs the infrared light radiated by the high-voltage electrode 2, it is converted into a voltage signal by multiple pairs of thermocouples connected in series inside the thermopile chip. The temperature of the high-voltage electrode 2 is determined based on the output voltage signal. The temperature sensing unit 6 can measure the temperature of the high-voltage electrode 2 remotely without contacting it.

[0045] The ultraviolet (UV) phototube is a phototube that utilizes the photoelectron emission effect. A key characteristic of UV phototubes is that they only respond to ultraviolet radiation below 300nm. UV phototubes possess high sensitivity, high output, and high response speed, and are also characterized by strong anti-interference capabilities, stability, reliability, long lifespan, and low power consumption. Based on the irradiance detected by the UV sensing unit 7, the main control chip dynamically adjusts the duty cycle of the current output by the high-frequency inverter module through the power compensation module to achieve a stable output of ±3% of the UV light intensity excited by the DBD light source component.

[0046] Reference Figure 3 The specific structure of high-voltage electrode 2 is shown below:

[0047] The high-voltage electrode 2 is a low-resistivity metal plate. The side of the high-voltage electrode 2 closest to the sealed cavity 3 is coated with a nanoscale metal thin film by magnetron sputtering. The side of the high-voltage electrode 2 furthest from the sealed cavity 3 is coated with a heat-conducting layer 21, which is a graphene-based composite phase change material layer in the prior art. The thickness of the metal thin film is 50-100 nm.

[0048] Because the surface of the high voltage electrode 2 is coated with a heat-conducting layer 21, the high thermal conductivity of the heat-conducting layer 21 is used to concentrate the heat generated by the high voltage electrode 2 during the discharge process to the outer surface of the heat-conducting layer 21; at the same time, the mounting cavity 13 is used to accelerate the heat dissipation of the high voltage electrode 2 and improve the discharge stability of the DBD light source assembly.

[0049] It should be noted that in this embodiment, the high-voltage electrode 2 is coated with a nanoscale metal thin film with a thickness of 100 nm on the side near the sealed cavity 3 using magnetron sputtering. The target material used in the prior art for the nanoscale metal thin film deposited by magnetron sputtering is a low-resistivity metal such as aluminum, copper, and molybdenum with a purity of over 99%. After sputtering, the metal thin film on the high-voltage electrode 2 has high adhesion, good film uniformity, dense film, and guaranteed reliability, and the material purity of the metal thin film is over 99%. In addition, the metal thin film deposited on the high-voltage electrode 2 by magnetron sputtering improves the discharge uniformity of the high-voltage electrode 2.

[0050] In addition, a heat-conducting layer 21 is provided on the side of the high-voltage electrode 2 away from the sealed cavity 3. The phase change material used in the heat-conducting layer 21 is a high-enthalpy phase change material. The heat-conducting layer 21 uses a graphene film as a support structure, and the phase change material is placed inside the graphene film. The porous structure of graphene can encapsulate the phase change material, prevent leakage of the phase change material, and improve the stability of its recycling.

[0051] The phase change material is polyethylene glycol.

[0052] Phase change materials (PCMs) are integrated with graphene to form PCM-graphene composite materials. This involves combining microporous graphene with PCMs. The continuous graphene network of graphene significantly improves the thermal conductivity of PCMs, while its micropores effectively adsorb liquid-phase PCMs. High thermal conductivity graphene PCM energy storage composite materials combine PCMs with thermally conductive graphene substrates using appropriate processes. This results in composite materials that possess both the excellent thermal conductivity of carbon materials and the high heat storage and energy storage characteristics of PCMs.

[0053] Phase change materials (PCCs) utilize the solid-liquid phase transition process to absorb or release large amounts of heat while maintaining a relatively constant temperature. During the energy storage and release process of PCCs, natural convection heat transfer occurs within the liquid phase as the PCCs solidify and melt. The increase in kinematic viscosity weakens the intensity of natural convection, thereby reducing the overall heat transfer efficiency of PCC energy storage during this stage. When the viscosity increases to a certain value, it may even offset the heat transfer enhancement effect brought about by the increase in thermal conductivity.

[0054] Although graphene itself is not a phase change material, its high thermal conductivity (5300-6000 W / mK) and mechanical strength (fracture strength 130 GPa) allow it to be used as an additive to improve the thermal conductivity of phase change materials and solve the problem of low thermal conductivity in phase change materials.

[0055] Reference Figure 3 The specific structure of the low-voltage electrode 5 is shown below:

[0056] A conductive plate 4 is provided inside the mounting cavity 13, and the conductive plate 4 and the shell 1 cooperate to form a liquid storage cavity for filling with ionized water; the ionized water serves as a low-pressure electrode 5.

[0057] Reference Figure 4 As shown, the main control component includes a main control module and a high-frequency inverter module.

[0058] The main control module is electrically connected to the high-voltage electrode 2 and low-voltage electrode 5 of the DBD light source component through a high-frequency inverter module, and the high-frequency inverter module is electrically connected to an external power supply. The high-frequency inverter module is used to convert the external power supply into AC high-voltage power supply and drive the DBD light source component to excite ultraviolet light.

[0059] Meanwhile, the main control module is electrically connected to the ultraviolet sensing unit 7, and the main control module is electrically connected to the high-frequency inverter module through the power compensation module. The power compensation module is used to dynamically adjust the output current of the high-frequency inverter module according to the irradiance detected by the ultraviolet sensing unit 7, so as to achieve a constant output of ultraviolet light excited by the DBD light source component.

[0060] The main control module uses an STM32H7 series microcontroller as its main control chip.

[0061] It is important to note that the main control chip dynamically adjusts the output current of the high-frequency inverter module based on the irradiance detected by the ultraviolet sensor unit 7, in order to achieve a constant output of ultraviolet light excited by the DBD light source component. Specifically, based on the irradiance detected by the ultraviolet sensor unit 7, the main control chip dynamically adjusts the duty cycle of the output current of the high-frequency inverter module through the power compensation module, in order to achieve a stable output of ultraviolet light intensity ±3% excited by the DBD light source component.

[0062] In this embodiment, the main control module is connected to the high-voltage electrode 2 and low-voltage electrode 5 of the two DBD light source components through a high-frequency inverter module. The main control module is electrically connected to the high-frequency inverter module through a power compensation module. Through a threshold triggering mechanism, the main control module detects and controls the operating status of the cooling fan 12, the high-frequency inverter module, and the infrared thermopile sensor 6. When the temperature of the high-voltage electrode 2 is ≥65℃, the following actions are performed:

[0063] ① Cut off the power output of the high-frequency inverter module to stop the operation of the DBD light source component, thereby stopping the ultraviolet excitation output by the DBD light source component;

[0064] ② Start the cooling fan 12 to its maximum speed (3000 rpm) so that the cool air output by the cooling fan 12 is delivered to the high voltage electrode 2 of the DBD light source component;

[0065] ③ When the temperature drops to 50℃, the ultraviolet radiation of the DBD light source component will be automatically restored, and the cooling fan speed will be reduced to switch to adaptive cooling mode (800rpm).

[0066] In this embodiment, the stable radiation device uses a DBD light source component to inactivate and disinfect viruses in the air, and the stable radiation device has multiple operating modes. It utilizes the medium gas within the DBD light source component to excite 222nm short-wave ultraviolet light, enabling the stable radiation device to efficiently sterilize and disinfect the surrounding air without blind spots. Simultaneously, the intensity of the ultraviolet light emitted by the DBD light source component can be adjusted. This solves the drawback of traditional ultraviolet disinfection methods that cause harm to the human body during operation. The DBD light source component has a simple structure and is easy to manufacture. It features selectable wavelengths, a wide wavelength coverage, high luminous efficiency, and spectral purity. The stable radiation device contains no highly toxic mercury, which is environmentally friendly.

[0067] Because the housing of the stable radiation device is made of quartz glass, it allows ultraviolet light to pass through, improving the efficiency of sterilization. The DBD light source component adopts a mercury-free excitation mechanism to eliminate the generation of ozone byproducts, while maintaining output stability and extending the service life of the device.

[0068] Example 2

[0069] Based on the high-voltage electrode 2 in Example 1, which is coated using magnetron sputtering technology, the influence of this high-uniformity coating process on ultraviolet excitation applications is tested. To highlight the experimental results and facilitate testing, the DBD light source assembly adopts a traditional coaxial structure. In this example, three comparative experiments are set up, with the following differences: the high-voltage electrode 2 in the first comparative group has deionized water as the conductive material; the high-voltage electrode 2 in the second comparative group has nano-sized copper powder as the conductive material (stronger conductivity and poorer discharge uniformity than the first comparative group); and the high-voltage electrode 2 in the third comparative group has a nano-sized copper film deposited by magnetron sputtering as the conductive material (stronger conductivity and better discharge uniformity than the first and second comparative groups). All three comparative groups are connected to an AC high-voltage power supply, causing the high-voltage electrode 2 and low-voltage electrode 5 of the DBD light source assembly to discharge. During the controlled discharge process, the voltage and current values ​​of the DBD light source assembly in the three comparative groups are the same, verifying the influence of different materials of the high-voltage electrode 2 on ultraviolet radiation during the discharge process.

[0070] The specific experimental steps in this embodiment are as follows:

[0071] Step 1: Turn on the AC high-voltage power supply and apply an input power of 20-30W to the high-voltage electrode 2 and low-voltage electrode 5 of the DBD light source component to ensure that the dielectric gas inside the DBD light source component excites short-wave ultraviolet light. After confirming that the DBD light source component can excite ultraviolet light, apply a discharge power of 100-150W to both ends of the DBD light source component. Detect the irradiance output by the DBD light source component through the ultraviolet sensing unit 7, and adjust the input voltage and current of the DBD light source component until the power output of the AC power supply is stable.

[0072] Step 2: Determine the discharge parameters and ultraviolet radiation band when the power supply is stably outputting, and after 10 minutes, use a radiometer to measure and calculate the average ultraviolet light intensity radiated under these discharge parameters, and use a high-speed camera to record the radiation state under these discharge parameters.

[0073] Step 3: Perform the tests on the first comparison group, the second comparison group, and the third comparison group in sequence according to the above steps, as follows:

[0074] First comparison group: When the ionized water filled in high-voltage electrode 2 discharged, the ionized water in high-voltage electrode 2 was boiling at the 10th minute, which did not meet the conditions for continued discharge. The camera recorded it as a uniform discharge in clumps, and the measured average light intensity was 101 μW / cm. 2 The calculated photoelectric conversion rate is 8%.

[0075] Second comparison group: When the surface of high-voltage electrode 2 was filled with nanoscale metal powder for discharge, the overall temperature of high-voltage electrode 2 did not change significantly within 10 minutes, and the camera recorded a filamentary discharge. As time increased, the metal powder in the cell gradually clumped together, and the brightness increased compared to the first comparison group, while the discharge uniformity decreased. The measured average light intensity was 124 μW / cm². 2 At this point, the photoelectric conversion efficiency reaches 10%.

[0076] Third comparison group: When a nanoscale copper film was deposited on the surface of high-voltage electrode 2, the overall temperature of high-voltage electrode 2 did not change significantly within 10 minutes. The camera recorded a uniform discharge in a cluster. The brightness increased compared to the first comparison group, and the discharge uniformity increased compared to the second comparison group. The measured average light intensity was 130 μW / cm². 2 At this point, the photoelectric conversion efficiency reaches 10.7%.

[0077] The result is that, using the deposited nanoscale film as the conductive material of the high-voltage electrode 2, the ultraviolet light intensity output at the same discharge power is increased by approximately 20 μW / cm compared to using deionized water as the high-voltage electrode 2. 2 The photoelectric conversion efficiency is improved by 2%-3%. Therefore, a nano-scale copper film is deposited on the high-voltage electrode 2 using magnetron sputtering technology. The nano-scale copper film can be used for ultraviolet excitation and has the effect of improving the average ultraviolet light intensity and discharge uniformity, thus enhancing the photoelectric conversion efficiency.

[0078] Example 3

[0079] Example 3 uses the stable radiation device of Example 1 to implement the control logic, and conducts comprehensive verification tests on temperature-light intensity coordinated regulation, discharge continuity, temperature control stability, and multi-mode operation strategy to evaluate the impact of the main control component and the heat-conducting layer 21 on the DBD light source component.

[0080] In this embodiment, the main control component intelligently regulates the excitation state of the DBD light source component through a threshold triggering mechanism; when the temperature of the high-voltage electrode 2 is ≥65℃, the following actions are performed:

[0081] ① Cut off the power output of the high-frequency inverter module to stop the operation of the DBD light source component, thereby stopping the ultraviolet excitation output by the DBD light source component;

[0082] ② Start the cooling fan 12 to its maximum speed (3000 rpm) so that the cool air output by the cooling fan 12 is delivered to the high voltage electrode 2 of the DBD light source component;

[0083] ③When the temperature drops to 50℃, the ultraviolet radiation of the DBD light source component will be automatically restored, and the cooling fan speed will be reduced to switch to adaptive cooling mode (800rpm).

[0084] In addition, the initialization phase of the main control component is based on the preset irradiance intensity (100 μW / cm). 2 The initial voltage is matched (10kV), and the output voltage is adjusted in real time through photodiode feedback during operation.

[0085] In this embodiment, the operating modes of the stable radiation device include silent disinfection mode, safe disinfection mode, and enhanced disinfection mode;

[0086] Safety disinfection mode: When personnel are present, the light intensity of the DBD light source component is adjusted to 50μW / cm². 2 The cooling fan is running at a low speed (800rpm).

[0087] Enhanced disinfection mode: When no personnel are present, the light intensity of the DBD light source component is adjusted to 100-120μW / cm². 2 When the ultraviolet sensor unit 7 detects the trigger temperature threshold of the high voltage electrode 2, it starts the intermittent operation of the stable radiation device (operation / cooling = 3:1 minute).

[0088] Silent disinfection mode: The light intensity of the DBD light source component is reduced to 30μW / cm². 2 The cooling fan is running at a low speed (800rpm).

[0089] The verification of the multi-mode operation strategy of the stable radiation device is shown in Table 1.

[0090] Table 1: Verification of Multi-Mode Operation Strategy

[0091]

[0092] The stable radiation device was operated continuously for 4 hours. The verification of the temperature-light intensity coordinated regulation of the stable radiation device is shown in Table 2.

[0093] Table 2: Verification of Temperature-Light Intensity Synergistic Regulation

[0094]

[0095] In this embodiment, based on the above data verification, the actual operating conditions can be determined according to different scenarios, and mode switching simulation can be performed for these scenarios. For example, during the day (8:00-18:00): personnel periodically enter and exit, triggering the switching between safe mode and enhanced mode; at night (18:00-8:00): silent mode operation. This embodiment achieves high reliability and intelligence of the ultraviolet disinfection device in complex scenarios through the combination of hardware and strategy, meeting the diverse needs of hospitals, laboratories, and other scenarios.

[0096] In summary, by placing two DBD light source components at both ends within the mounting cavity 13, with the cooling fan 12 located within the opening in the housing 1 and heat dissipation holes 11 formed on the housing 1, the high-voltage electrode 2 of the DBD light source component is situated within the airflow channel formed between the opening and the heat dissipation holes 11. Simultaneously, utilizing the high thermal conductivity of the heat-conducting layer 21, the heat generated by the high-voltage electrode 2 during discharge is concentrated on the outer surface of the heat-conducting layer 21. The cooling fan 12 accelerates the heat dissipation of the high-voltage electrode 2, thereby improving the discharge stability of the DBD light source component. Because the heat-conducting layer 21 uses a graphene-based composite phase change material, its heat transfer performance is improved, achieving efficient heat dissipation of the high-voltage electrode 2. This results in significantly improved temperature uniformity and cooling efficiency compared to traditional heat dissipation methods.

[0097] In addition, the main control component adjusts the input power of the DBD light source component based on the real-time detection of the sensor component to achieve long-term continuous short-wave ultraviolet radiation; the ultraviolet sensing unit 7 detects the irradiation intensity of the DBD light source component in real time, improves the photoelectric conversion efficiency and photoelectric stability of the DBD light source component, and enhances the dynamic adjustment capability of the DBD light source component, thus making it suitable for sensitive places such as hospitals and schools to achieve efficient sterilization and promote the popularization of mercury-free ultraviolet technology.

[0098] This solution uses a sealed cavity 3 containing a medium gas for emitting short-wave ultraviolet light, and forms an electric field between the low-pressure electrode 5 and the high-pressure electrode 2, causing the medium gas to emit 222nm short-wave ultraviolet light. This enables the stable radiation device to effectively sterilize and disinfect the surrounding air without dead angles, avoiding the risks of DNA damage and mercury pollution to the human body caused by traditional 254nm ultraviolet light, while improving sterilization efficiency.

[0099] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model 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 of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A short-wave ultraviolet high-photon energy stable radiation device, characterized in that: Includes housing (1), DBD light source assembly, sensor assembly and main control assembly; The DBD light source assembly is located in the mounting cavity (13) of the housing (1); the housing (1) has an opening, and a cooling fan (12) is installed in the opening; the housing (1) has a plurality of heat dissipation holes (11); the opening and the plurality of heat dissipation holes (11) form an air flow channel for heat dissipation; the high voltage electrode (2) of the DBD light source assembly is arranged facing the air flow channel. The sensor assembly includes a temperature sensing unit (6) and an ultraviolet sensing unit (7). The temperature sensing unit (6) is used to detect the temperature of the high voltage electrode (2) of the DBD light source assembly. The ultraviolet sensing unit (7) is used to detect the irradiance of the ultraviolet light emitted by the DBD light source assembly. The output terminals of the temperature sensing unit (6) and the ultraviolet sensing unit (7) are respectively connected to the input terminal of the main control assembly. The control terminal of the main control assembly is respectively connected to the DBD light source assembly and the cooling fan (12).

2. The short-wave ultraviolet high-photon energy stable radiation device according to claim 1, characterized in that: The DBD light source assembly includes a high-voltage electrode (2) and a low-voltage electrode (5); the high-voltage electrode (2) and the low-voltage electrode (5) are both located in the mounting cavity (13), and the high-voltage electrode (2), the low-voltage electrode (5) and the housing (1) cooperate to form a sealed cavity (3) for filling the medium gas.

3. The short-wave ultraviolet high-photon energy stable radiation device according to claim 2, characterized in that: The high voltage electrode (2) is a low resistivity metal plate, and a nanoscale metal thin film is provided on the side of the high voltage electrode (2) near the sealed cavity (3). The thickness of the metal thin film is 50-100 nm.

4. The short-wave ultraviolet high-photon energy stable radiation device according to claim 3, characterized in that: The high-voltage electrode (2) has a heat-conducting layer (21) on the side away from the sealed cavity (3).

5. A short-wave ultraviolet high-photon energy stable radiation device according to claim 4, characterized in that: The thermally conductive layer (21) is a graphene-based composite phase change material layer.

6. A short-wave ultraviolet high-photon energy stable radiation device according to claim 2, characterized in that: The mounting cavity (13) is provided with a conductive plate (4), and the conductive plate (4) and the shell (1) cooperate to form a liquid storage cavity for filling ionized water; the ionized water in the liquid storage cavity serves as a low-pressure electrode (5).

7. The short-wave ultraviolet high-photon energy stable radiation device according to claim 1, characterized in that: The mounting cavity (13) contains two DBD light source components, and the two DBD light source components are respectively located at both ends of the mounting cavity (13); the air flow channel formed by the cooling fan (12) and several heat dissipation holes (11) is located between the two DBD light source components.

8. A short-wave ultraviolet high-photon energy stable radiation device according to claim 7, characterized in that: The housing (1) has two through holes for inserting temperature sensing units (6), and the detection ends of the two temperature sensing units (6) are respectively facing the high voltage electrodes (2) of the two DBD light source components; the housing (1) is provided with two ultraviolet sensing units (7), and the ultraviolet sensing units (7) are correspondingly arranged with the sealed cavity (3) of the DBD light source components; wherein, the temperature sensing unit (6) is an infrared thermopile sensor; the ultraviolet sensing unit (7) is an ultraviolet sensing tube.

9. A short-wave ultraviolet high-photon energy stable radiation device according to claim 1, characterized in that: The main control component includes a main control module and a high-frequency inverter module. The main control module is electrically connected to the high voltage electrode (2) and low voltage electrode (5) of the DBD light source component through a high frequency inverter module. The high frequency inverter module is used to convert the external power supply into AC high voltage power supply and drive the DBD light source component to excite ultraviolet light.

10. A short-wave ultraviolet high-photon energy stable radiation device according to claim 9, characterized in that: The main control module is electrically connected to the high-frequency inverter module through the power compensation module. The power compensation module is used to dynamically adjust the output current of the high-frequency inverter module according to the irradiance detected by the ultraviolet sensor unit (7) so as to achieve constant output of ultraviolet light excited by the DBD light source component.

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