A device and method for suppressing frost and fog on a light window in a temperature difference environment

Abstract

The application discloses a device and method for inhibiting frost and fog of a light window in a temperature difference environment, and relates to the technical field of optical equipment adjustment. The device comprises a connecting cylinder, which is open at both ends and is provided with an air inlet nozzle in the connecting cylinder, the air inlet nozzle being used for connecting a gas input system; an observation lens, which is arranged at one end of the connecting cylinder; and a diaphragm assembly, which is arranged at the other end of the connecting cylinder and can control the opening size of the connecting cylinder. In a working state, one end of the connecting cylinder provided with the observation lens is sealingly and fixedly connected with a flange of an environmental test chamber. In a closed state of the diaphragm assembly, damping can be applied to the gas output from the connecting cylinder, frost and fog can be effectively inhibited, the temperature change in the environmental test chamber can be avoided, and the effectiveness of observation can be ensured. The inhibition method is based on the above-mentioned inhibition device.

Description

Technical Field

[0001] This invention relates to the field of optical assembly technology, specifically to a device and method for suppressing frost and fog in temperature difference-isolated optical windows. Background Technology

[0002] Optical windows are typically installed at the interface between equipment and the external environment to isolate internal components from external factors such as temperature, pressure, airtightness, and humidity, protecting them from damage. Simultaneously, optical windows also require visual observation and optical measurement to ensure certain optical performance. With continuous technological advancements, the temperature differences between the internal and external environments of equipment are becoming increasingly severe. In environments with large temperature differences, condensation easily occurs on the surface of the optical window due to temperature variations, leading to frost and fogging, which affects the light transmittance and usability of the window. Therefore, the need for frost and fog suppression in environments with large temperature differences is increasing. For example, in the manufacturing and use of aviation, aerospace, automotive, and high-end equipment, frost and fogging problems severely affect the clarity of the equipment's field of vision and operational safety. Summary of the Invention

[0003] To address the technical problem of suppressing frost and fog on isolation windows in temperature difference environments, this invention provides a device and method for suppressing frost and fog on isolation windows in temperature difference environments. This effectively prevents the formation of frost and fog on the windows in temperature difference environments, ensuring that the clarity of the window light and the safety of operation meet the requirements for use in temperature difference environments.

[0004] This invention is achieved through the following technical solution:

[0005] In a first aspect, the present invention provides a frost and fog suppression method for a temperature difference environment isolation light window, comprising: a connecting cylinder with openings at both ends, and an air inlet provided inside the connecting cylinder for connecting to a gas input system; an observation lens disposed at one end of the connecting cylinder; and an aperture assembly mounted at the other end of the connecting cylinder, the aperture assembly being capable of controlling the opening size of the connecting cylinder; wherein, in the working state, the end of the connecting cylinder with the observation lens is sealed and fixedly connected to the flange of the environmental test chamber, and when the aperture assembly is closed, it is capable of applying damping to the gas output from the connecting cylinder.

[0006] It should be noted that in the manufacturing and use of aviation, aerospace, automotive, and high-end equipment, condensation on optical windows severely affects the clarity of the field of view and operational safety. According to the mechanism of suppressing condensation, the temperature of optical components needs to be higher than the dew point temperature of the current environment. However, when the environment inside the environmental test chamber changes, the exterior of the optical component's glass, affected by external air convection, cannot heat up rapidly with the internal environment. When the glass surface temperature falls below the current dew point, condensation droplets will form on the glass surface, and when the dew point is below 0°C, frost will condense.

[0007] As can be seen from the principle of frost and fog condensation, the core of frost and fog suppression is to raise the surface temperature of the optical window to above the dew point temperature of the environment. Common methods to raise the surface temperature include blowing hot air to remove fog and using electrothermal resistive film to remove fog. However, in extreme environments with large temperature differences and large-aperture optical windows, a small amount of hot air cannot produce an effective effect, while an excessive amount of air will cause changes in the internal temperature of the equipment. Furthermore, electrothermal resistive film often interferes with the line of sight or the optical path of optical measurement, making effective observation impossible.

[0008] In view of this, the present invention provides a temperature difference environment isolation light window frost and fog suppression, including a connecting cylinder, an observation lens and an aperture assembly. An air inlet is provided in the connecting cylinder, which can be connected to a gas input system to input the corresponding gas into the inner cavity of the connecting cylinder. The observation lens is located at one end of the connecting cylinder and the aperture assembly is installed at the other end of the connecting cylinder. The aperture assembly can control the opening size of the connecting cylinder.

[0009] When in use, it is installed on the observation side of the environmental test chamber. With the aperture assembly closed, gas with a set temperature and flow rate is introduced into the inner cavity of the connecting cylinder so that the temperature inside the connecting cylinder is higher than the ambient temperature inside the environmental test chamber. This reduces the temperature difference on both sides of the observation lens, thereby raising the ambient temperature near the observation lens to above the current ambient dew point temperature, thus suppressing frost and dew.

[0010] Simultaneously, with the aperture assembly closed, it applies damping to the gas output from the connecting cylinder, allowing the gas inside the connecting cylinder to continuously flow out through the gaps in the aperture assembly. This maintains a slightly positive pressure environment inside the connecting cylinder, preventing external ambient gas from flowing in and exchanging heat, thus avoiding the formation of a localized thermal field. Furthermore, the aperture assembly can be opened; observation can be performed simply by opening and closing the aperture assembly when needed, without interfering with the line of sight or the optical path for measurement, thereby ensuring the effectiveness of the observation.

[0011] In summary, the temperature difference environment isolation light window frost and fog suppression device provided by the present invention effectively suppresses frost and dew while avoiding changes in the internal temperature of the environmental test chamber and ensuring the effectiveness of observation.

[0012] In one optional embodiment of this application, multiple air inlets are provided, and the multiple air inlets are evenly distributed along the circumference of the connecting cylinder to ensure uniform and stable input of defrosting gas.

[0013] In one optional embodiment of this application, the length of the connecting cylinder is less than the radius of the observation lens to reduce the volume of the connecting cylinder, thereby maintaining a slightly positive pressure inside the connecting cylinder with a smaller air flow rate.

[0014] In one optional embodiment of this application, the connecting cylinder is equipped with an insulation layer to reduce the conduction of ambient temperature to the interior of the connecting cylinder through the connecting cylinder, so that the interior of the connecting cylinder is always kept at a constant temperature.

[0015] In one optional embodiment of this application, the insulation layer is made of foam plastic to ensure that the insulation layer has sufficient heat insulation properties.

[0016] In one optional embodiment of this application, a mounting structure is fixedly connected to one end of the connecting cylinder, and an observation hole is provided in the middle of the mounting structure; the observation lens is installed inside the mounting structure, and the observation lens is coaxially arranged with the observation hole, so as to facilitate the installation of the observation lens on the connecting cylinder.

[0017] In one optional embodiment of this application, the aperture assembly includes: a fixed ring, which is fixedly connected to the connecting cylinder; a movable ring, which is used to connect to a rotary driver and is capable of rotating relative to the fixed ring along its own axis; and multiple aperture plates, which are evenly distributed along the circumference of the fixed ring, with one end of each aperture plate hinged to the fixed ring and the other end drivenly connected to the movable ring, and the end of the aperture plate connected to the fixed ring being capable of moving along the rotation direction of the movable ring; wherein, when the movable ring rotates, the movable ring can drive the multiple aperture plates to rotate, thereby adjusting the opening size of the connecting cylinder.

[0018] In one optional embodiment of this application, when the aperture assembly is closed, the gas flow gap between two adjacent aperture plates is 0.05mm to 0.15mm, so as to ensure that when the aperture assembly is closed, damping can be applied to the gas output from the connecting cylinder, so that the inner cavity of the connecting cylinder can maintain a micro-positive pressure local thermal field.

[0019] Secondly, the present invention provides a method for suppressing frost and fog in temperature difference environment isolation light windows, comprising the following steps:

[0020] The aforementioned temperature difference environment isolation light window frost and fog suppression device is installed on the observation side of the environmental test chamber;

[0021] The aperture assembly is closed, and gas with a set temperature and flow rate is introduced into the inner cavity of the connecting cylinder. The set temperature is higher than the ambient temperature inside the environmental test chamber.

[0022] The present invention provides a method for suppressing frost and fog in a temperature difference-isolated optical window. The aforementioned frost and fog suppression device is installed on the observation side of an environmental test chamber. With the aperture assembly closed, a gas with a set temperature and flow rate is input into the inner cavity of the connecting cylinder. The set temperature is higher than the ambient temperature inside the environmental test chamber, so that the temperature inside the connecting cylinder is higher than the ambient temperature inside the environmental test chamber. This reduces the temperature difference between the two sides of the observation lens, thereby raising the ambient temperature near the observation lens to above the current ambient dew point temperature, thus suppressing frost and fog.

[0023] The aperture assembly can dampen the gas output from the connecting cylinder, allowing the gas inside the connecting cylinder to continuously flow out through the gap of the aperture assembly. This maintains a slightly positive pressure environment inside the connecting cylinder, preventing external ambient gas from flowing in and exchanging heat, thus forming a localized thermal field.

[0024] In summary, the frost and fog suppression method provided by the present invention effectively suppresses frost and dew while avoiding changes in the internal temperature of the environmental test chamber and ensuring the effectiveness of observation.

[0025] In one optional embodiment of this application, the gas input into the inner cavity of the connecting cylinder is a room temperature gas, and the input flow rate is 0.003 m³ / h. 3 / s~0.004m 3 / s, to ensure that while suppressing frost and fog on the observation lens, the impact on the temperature inside the environmental test chamber is reduced.

[0026] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0027] 1. The temperature difference environmental isolation light window frost and fog suppression device provided by the present invention includes a connecting cylinder, an observation lens, and an aperture assembly. An air inlet is provided in the connecting cylinder, which can be connected to a gas input system to input the corresponding gas into the inner cavity of the connecting cylinder. The observation lens is located at one end of the connecting cylinder, and the aperture assembly is installed at the other end of the connecting cylinder. The aperture assembly can control the opening size of the connecting cylinder. When the aperture assembly is closed, it can input gas with a set temperature and flow rate into the inner cavity of the connecting cylinder so that the temperature of the inner cavity of the connecting cylinder is higher than the ambient temperature inside the environmental test chamber, thereby reducing the temperature difference on both sides of the observation lens and raising the ambient temperature near the observation lens to above the current ambient dew point temperature, thus suppressing frost and fog. Damping is applied to the gas output from the connecting cylinder to form a local thermal field. Therefore, while effectively suppressing frost and fog, it can avoid causing changes in the internal temperature of the environmental test chamber and ensure the effectiveness of observation.

[0028] 2. The frost and fog suppression method for temperature difference environmental isolation light window provided by the present invention involves installing the aforementioned frost and fog suppression device on the observation side of an environmental test chamber. With the aperture assembly closed, a gas with a set temperature and flow rate is input into the inner cavity of the connecting cylinder. The set temperature is higher than the ambient temperature inside the environmental test chamber, so that the temperature inside the connecting cylinder is higher than the ambient temperature inside the environmental test chamber, reducing the temperature difference on both sides of the observation lens. This raises the ambient temperature near the observation lens to above the current ambient dew point temperature, thereby suppressing frost and fog. Furthermore, the aperture assembly can apply damping to the gas output from the connecting cylinder, thereby forming a local thermal field. This effectively suppresses frost and fog while avoiding changes in the internal temperature of the environmental test chamber and ensuring the effectiveness of the observation. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] In the attached diagram:

[0031] Figure 1 This is a schematic diagram of the exploded structure of the temperature difference environment isolation light window frost and fog suppression device provided in an embodiment of the present invention;

[0032] Figure 2 This is a side view of the connecting cylinder structure provided in an embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the structure of the aperture assembly provided in an embodiment of the present invention.

[0034] The attached diagram shows the markings and corresponding component names:

[0035] 10-Connecting cylinder, 11-Air inlet nozzle, 20-Observation lens, 30-Aperture assembly, 31-Fixed ring, 32-Modible ring, 33-Aperture plate, 40-Mounting structure, 41-Observation hole. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0039] In the description of this application, it should be noted that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this application is usually placed when in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0040] It should be noted that, where there is no conflict, different features in the embodiments of this application can be combined with each other.

[0041] Furthermore, in the manufacturing and use of aviation, aerospace, automotive, and high-end equipment, condensation on optical windows severely affects the clarity of the field of view and operational safety. According to the mechanism of suppressing condensation, the temperature of optical components needs to be higher than the dew point temperature of the current environment. The dew point temperature varies under different temperature and humidity conditions, and the formula for calculating the dew point temperature is as follows:

[0042]

[0043] Where T dew Here, T represents the dew point temperature in degrees Celsius; RH represents the relative humidity; and ln represents the natural logarithm. The dew point temperature decreases with increasing humidity and increases with increasing ambient temperature. Generally, the dew point temperature is lower than the current ambient temperature. For example, for air at 20°C and 70% relative humidity, the dew point temperature is approximately 14.36°C. In different operating environments within an environmental test chamber for a certain type of aviation equipment, the dew point temperature ranges from approximately 80°C to -50°C. When the environment inside the test chamber changes, the exterior of the glass of the optical components, affected by external air convection, cannot heat up rapidly with the internal environment. When the glass surface temperature falls below the current dew point, fog droplets will form on the glass surface, and when the dew point is below 0°C, frost will condense.

[0044] As can be seen from the principle of frost and fog condensation, the core of frost and fog suppression is to raise the surface temperature of the optical window to above the dew point temperature of the environment. Common methods to raise the surface temperature include blowing hot air to remove fog and using electrothermal resistive film to remove fog. However, in extreme environments with large temperature differences and large-aperture optical windows, a small amount of hot air cannot produce an effective effect, while an excessive amount of air will cause changes in the internal temperature of the equipment. Furthermore, electrothermal resistive film often interferes with the line of sight or the optical path of optical measurement, making effective observation impossible.

[0045] To address the aforementioned problems, the inventors have innovatively designed the following technical solutions, which will be described in detail below with reference to the accompanying drawings. It should be noted that the deficiencies in the existing solutions are the result of the inventors' practical experience and careful research. Therefore, the discovery process of the aforementioned technical problems and the solutions proposed in the embodiments below are contributions made by the inventors to this application during the invention process, and should not be construed as technical content known to those skilled in the art.

[0046] Example 1

[0047] Combination Figure 1 This embodiment provides a method for suppressing frost and fog in a temperature difference environment isolation light window, comprising: a connecting cylinder 10, with openings at both ends, and an air inlet 11 inside the connecting cylinder 10 for connecting to a gas input system; an observation lens 20 disposed at one end of the connecting cylinder 10; and an aperture assembly 30 mounted at the other end of the connecting cylinder 10, capable of controlling the size of the openings of the connecting cylinder 10. In the working state, the end of the connecting cylinder 10 containing the observation lens 20 is sealed and fixedly connected to the flange of the environmental test chamber. When the aperture assembly 30 is closed, it can apply damping to the gas output from the connecting cylinder 10.

[0048] Combination Figure 2 The air inlet nozzle 11 is a ventilation nozzle connected inside the connecting cylinder 10, and the connection between the ventilation nozzle and the inside of the connecting cylinder 10 is sealed to prevent air leakage. Typically, multiple air inlets 11 are provided, evenly distributed along the circumference of the connecting cylinder 10 to ensure uniform and stable input of the defrosting gas. The specific number of air inlets 11 is determined according to the diameter of the connecting cylinder 10; for example, this embodiment has six air inlets 11.

[0049] In this embodiment, the length of the connecting cylinder 10 is less than the radius of the observation lens 20 to reduce the volume of the connecting cylinder 10, thereby maintaining a slightly positive pressure inside the connecting cylinder 10 with a smaller air flow rate.

[0050] It is understood that the connecting cylinder 10 is equipped with an insulation layer to reduce the conduction of ambient temperature to the interior of the connecting cylinder 10, thus maintaining a constant temperature inside the connecting cylinder 10. Generally, the insulation layer is made of foam plastic to ensure sufficient thermal insulation. Of course, insulation materials such as thermal insulation coatings can also be used to make the insulation layer, which can be a double-layered vacuum insulation structure.

[0051] Recombined Figure 1 One end of the connecting cylinder 10 is fixedly connected to an installation structure 40, and an observation hole 41 is provided in the middle of the installation structure 40. The observation lens 20 is installed in the installation structure 40, and the observation lens 20 is coaxially arranged with the observation hole 41 so as to facilitate the installation of the observation lens 20 on the connecting cylinder 10.

[0052] Combination Figure 3 The aperture assembly 30 includes: a fixed ring 31, which is fixedly connected to the connecting cylinder 10; a movable ring 32, which is used to connect to a rotary driver and can rotate relative to the fixed ring 31 along its own axis; and multiple aperture plates 33, which are evenly distributed along the circumference of the fixed ring 31. One end of each aperture plate 33 is hinged to the fixed ring 31, and the other end is drivenly connected to the movable ring 32. The end of the aperture plate 33 connected to the fixed ring 31 can move along the rotation direction of the movable ring 32, thereby forming a shutter structure. When the movable ring 32 rotates, it can drive the multiple aperture plates 33 to rotate, thereby adjusting the opening size of the connecting cylinder 10. That is, by driving the sliding ring to rotate through the rotary driver (such as a motor), the aperture plates 33 are driven to rotate, thus changing the size of the cross-section of the intermediate light transmission channel. Of course, other shutter structures can also be used.

[0053] It is understandable that when the aperture assembly 30 is in the closed state, there is no need to seal between the aperture plates 33. However, the gap in the closure should not be too large. It is only necessary to ensure that the constant temperature gas inside the connecting cylinder 10 can continuously flow out from the gap between the aperture plates 33, so that a slightly positive pressure environment is formed in the inner cavity of the connecting cylinder 10, preventing external ambient gas from flowing in and exchanging heat, thus forming a local heat field.

[0054] In this embodiment, when the aperture assembly 30 is closed, the gas flow gap between two adjacent aperture plates 33 is 0.05mm to 0.15mm, so as to ensure that when the aperture assembly 30 is closed, damping can be applied to the gas output from the connecting cylinder 10, so that the inner cavity of the connecting cylinder 10 can maintain a micro-positive pressure local thermal field.

[0055] In summary, the temperature difference environment isolation light window frost and fog suppression provided in this embodiment includes a connecting cylinder 10, an observation lens 20, and an aperture assembly 30. An air inlet 11 is provided inside the connecting cylinder 10, which can be connected to a gas input system to input the corresponding gas into the inner cavity of the connecting cylinder 10. The observation lens 20 is located at one end of the connecting cylinder 10, and the aperture assembly is installed at the other end of the connecting cylinder 10. The aperture assembly 30 can control the opening size of the connecting cylinder 10.

[0056] When in use, it is installed on the observation side of the environmental test chamber. With the aperture assembly 30 closed, gas with a set temperature (e.g., 22 degrees Celsius) and flow rate (e.g., 0.0035 m3 / s) is introduced into the inner cavity of the connecting cylinder 10 so that the temperature inside the connecting cylinder 10 is higher than the ambient temperature inside the environmental test chamber, thereby reducing the temperature difference on both sides of the observation lens 20 and raising the ambient temperature near the observation lens 20 to above the current ambient dew point temperature, thus suppressing frost and dew.

[0057] Meanwhile, when the aperture assembly 30 is closed, it can apply damping to the gas output from the connecting cylinder 10. The constant temperature gas inside the connecting cylinder 10 can continuously flow out from the gap between the aperture plates 33, so that a slightly positive pressure environment is formed in the inner cavity of the connecting cylinder 10, preventing external ambient gas from flowing in and exchanging heat, forming a local thermal field, and ensuring that the temperature of the inner cavity of the connecting cylinder 10 remains basically unchanged.

[0058] Furthermore, the aperture assembly 30 can be opened, allowing observation to be performed simply by opening the aperture assembly 30 when needed, without interfering with the line of sight or the optical path for optical measurement, thus ensuring the effectiveness of the observation. The aperture assembly 30 is only opened when operation is required and remains closed at other times.

[0059] In summary, the temperature difference environment isolation light window frost and fog suppression device provided in this embodiment establishes a micro-positive pressure of gas near the observation lens 20, which can maintain a local thermal field with a small amount of gas, thereby raising the ambient temperature near the observation lens 20 to above the current ambient dew point temperature. While effectively suppressing frost and dew, it avoids causing changes in the internal temperature of the environmental test chamber and ensures the effectiveness of observation. It can be widely used in optical systems that require defogging, especially in large-aperture lens observation structures.

[0060] Example 2

[0061] This embodiment provides a method for suppressing frost and fog in temperature difference-controlled isolation windows, including the following steps:

[0062] S10. Install the temperature difference environment isolation light window frost and fog suppression device described in Example 1 on the observation side of the environmental test chamber.

[0063] Specifically, regarding the condensation problem of frost and fog on the light window of a certain type of environmental test chamber, the glass aperture of which is 400mm, the temperature inside the chamber is raised from -50℃ to -20℃, while the outside of the chamber is at room temperature (22℃). Without the temperature difference isolation light window frost and fog suppression device described in Example 1, the glass temperature change lags behind the temperature inside the chamber, causing the glass temperature to fall below the ambient dew point temperature. At this point, frost and fog will condense on the inner surface of the glass. To address this, the temperature difference isolation light window frost and fog suppression device described in Example 1 is installed on the observation side of the environmental test chamber.

[0064] S20. Close the aperture assembly 30 and input gas with a set temperature and flow rate into the inner cavity of the connecting cylinder 10. The set temperature is higher than the ambient temperature inside the environmental test chamber.

[0065] Specifically, the gas input into the inner cavity of the connecting cylinder 10 is filtered room temperature gas, and the input flow rate is 0.003 m3 / s to 0.004 m3 / s, so as to ensure that the observation lens 20 can be partially suppressed for frost and fogging, while reducing the impact on the temperature inside the environmental test chamber.

[0066] In summary, the frost and fog suppression method for temperature difference environmental isolation light window provided in this embodiment involves installing the aforementioned frost and fog suppression device on the observation side of an environmental test chamber. With the aperture assembly 30 closed, gas with a set temperature and flow rate is input into the inner cavity of the connecting cylinder 10. The set temperature is higher than the ambient temperature inside the environmental test chamber, thereby reducing the temperature difference between the two sides of the observation lens 20 and raising the ambient temperature near the observation lens 20 to above the current ambient dew point temperature, thus suppressing frost and fog.

[0067] The aperture assembly 30 can dampen the gas output from the connecting cylinder 10, and the constant temperature gas inside the connecting cylinder 10 can continuously flow out through the gaps between the aperture plates 33, so that a slightly positive pressure environment is formed inside the connecting cylinder 10, preventing external ambient gas from flowing in and exchanging heat, forming a local thermal field, and ensuring that the temperature inside the connecting cylinder 10 remains basically unchanged.

[0068] In summary, the frost and fog suppression method provided in this embodiment effectively suppresses frost and dew while avoiding changes in the internal temperature of the environmental test chamber and ensuring the effectiveness of observation.

[0069] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for suppressing frost and fog in a temperature difference environment isolation light window, characterized in that, include: A connecting cylinder (10) is provided with openings at both ends, and an air inlet (11) is provided inside the connecting cylinder (10). The air inlet (11) is used to connect to a gas input system. An observation lens (20) is provided at one end of the connecting cylinder (10); Aperture assembly (30) is installed at the other end of the connecting cylinder (10), and the aperture assembly (30) can control the opening size of the connecting cylinder (10); In the working state, the connecting cylinder (10) is provided with one end of the observation lens (20), which is sealed and fixedly connected to the flange of the environmental test chamber. When the aperture assembly (30) is closed, it can apply damping to the gas output from the connecting cylinder (10). The aperture assembly (30) includes: A fixing ring (31) is fixedly connected to the connecting cylinder (10); A movable ring (32) is used to connect a rotary driver and is capable of rotating relative to the fixed ring (31) along its own axis; Aperture (33), wherein multiple apertures (33) are provided, the multiple apertures (33) are evenly distributed along the circumference of the fixed ring (31), and one end of each aperture (33) is hinged to the fixed ring (31) and the other end is drivenly connected to the movable ring (32), and the end of the aperture (33) connected to the fixed ring (31) can move along the rotation direction of the movable ring (32); When the movable ring (32) rotates, the movable ring (32) can drive multiple aperture plates (33) to rotate, so as to adjust the opening size of the connecting cylinder (10). When the aperture assembly (30) is closed, the gas flow gap between two adjacent aperture plates (33) is 0.05mm to 0.15mm.

2. The temperature difference environment isolation light window frost and fog suppression device according to claim 1, characterized in that, Multiple air inlets (11) are provided, and the multiple air inlets (11) are evenly distributed along the circumference of the connecting cylinder (10).

3. The temperature difference environment isolation light window frost and fog suppression device according to claim 1, characterized in that, The length of the connecting cylinder (10) is less than the radius of the observation lens (20).

4. The temperature difference environment isolation light window frost and fog suppression device according to claim 1, characterized in that, The connecting cylinder (10) is equipped with a heat insulation layer.

5. The temperature difference environment isolation light window frost and fog suppression device according to claim 4, characterized in that, The insulation layer is made of foam plastic.

6. The temperature difference environment isolation light window frost and fog suppression device according to claim 1, characterized in that, One end of the connecting cylinder (10) is fixedly connected to an installation structure (40), and an observation hole (41) is provided in the middle of the installation structure (40). The observation lens (20) is installed inside the mounting structure (40), and the observation lens (20) is coaxially arranged with the observation hole (41).

7. A method for suppressing frost and fog in a temperature difference-controlled environment with an isolated light window, characterized in that, Includes the following steps: The temperature difference environment isolation light window frost and fog suppression device according to any one of claims 1 to 6 is installed on the observation side of the environmental test chamber; The aperture assembly (30) is closed, and gas with a set temperature and flow rate is input into the inner cavity of the connecting cylinder (10), wherein the set temperature is higher than the ambient temperature inside the environmental test chamber.

8. The method for suppressing frost and fog in a temperature difference environment isolation light window according to claim 7, characterized in that, The gas input into the inner cavity of the connecting cylinder (10) is room temperature gas, and the input flow rate is 0.003 m³ / h. 3 / s~0.004m 3 / s.

Images