Device and method for inhibiting frost and fog of isolation light window in temperature difference environment

Abstract

The invention discloses a frost and fog suppression device and method for an isolation light window in a temperature difference environment, and relates to the technical field of optical adjustment. The suppression device comprises a connecting cylinder, the two ends of the connecting cylinder are open, a gas inlet nozzle is arranged in the connecting cylinder, and the gas inlet nozzle is used for being connected with a gas input system; the observation lens is arranged at one end of the connecting cylinder body; the diaphragm assembly is installed at the other end of the connecting cylinder body, and the diaphragm assembly can control the size of an opening of the connecting cylinder body; wherein in the working state, one end, provided with the observation lens, of the connecting cylinder is sealed and fixedly connected with a flange of an environmental test box, and in the state that the diaphragm assembly is closed, damping can be applied to gas output from the interior of the connecting cylinder, so that frost dew is effectively inhibited, and meanwhile, the stability of the observation lens is improved. The change of the internal temperature of the environment test box is avoided; and the observation effectiveness is ensured. The suppression method is based on the suppression device.

Description

Technical Field

[0001] The present invention relates to the technical field of optical assembly and adjustment, and in particular to a device and method for suppressing frost and fog on a light window isolated from a temperature difference environment. Background Art

[0002] Optical windows are usually installed at the junction of equipment and the external environment to isolate external factors such as temperature, pressure, airtightness, humidity, etc., and protect internal components from damage. At the same time, optical windows also need to be visually observed and optically measured to ensure certain optical performance. With the continuous advancement of science and technology, the temperature difference between the inside and outside of the equipment service environment has become more and more stringent. In an environment with a large temperature difference, condensation is prone to occur on the surface of the optical window due to the temperature difference, resulting in the formation of frost and fog, which affects the light transmittance and use effect of the window. As a result, the demand for frost and fog suppression of optical windows in temperature difference environments is increasing. For example, in the manufacture and use of aviation, aerospace, automobiles and high-end equipment, the problem of frost and fog on optical windows seriously affects the clarity of vision and operational safety of the equipment. Summary of the invention

[0003] In response to the technical problem of suppressing frost and fog on isolated light windows in a temperature difference environment, the present invention provides a device and method for suppressing frost and fog on isolated light windows in a temperature difference environment, which can effectively prevent the formation of frost and fog on light windows in a temperature difference environment, so as to ensure that the visual clarity and operational safety of the window light meet the usage requirements in the temperature difference environment.

[0004] The present invention is achieved through the following technical solutions:

[0005] In the first aspect, the present invention provides a frost and fog suppression system for an optical window isolated in a temperature difference environment, comprising: a connecting cylinder, which is open at both ends and is provided with an air inlet nozzle in the connecting cylinder, and the air inlet nozzle is used to connect to a gas input system; an observation lens, which is provided at one end of the connecting cylinder; an aperture assembly, which is installed at the other end of the connecting cylinder, and the aperture assembly can control the opening size of the connecting cylinder; wherein, in a working state, the connecting cylinder is provided with one end of the observation lens, which is sealed and fixedly connected to the flange of the environmental test chamber, and when the aperture assembly is closed, damping can be applied to the gas output from the connecting cylinder.

[0006] It should be noted that in the manufacture and use of aviation, aerospace, automobiles and high-end equipment, the problem of frost on optical windows seriously affects the clarity of vision and operational safety of the equipment. According to the mechanism of suppressing condensation, the temperature of the optical components needs to be higher than the dew point temperature in the current environment. When the environment in the environmental test chamber changes, the outer glass of the optical components is affected by the external air convection and cannot heat up quickly with the environment in the chamber. When the glass surface temperature is lower than the current dew point, fog droplets will appear on the glass surface, and condense into frost when the dew point is lower than 0°C.

[0007] From the principle of frost condensation, we know that the key to frost 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 defog, electric heat resistance wire film to defog, etc. However, in the extreme environment of large temperature difference and large diameter optical window, it will not produce effective effect when the amount of hot air is small, and it will cause the temperature inside the equipment to change when the amount of air is too much; and the electric heat resistance wire film will often interfere with the line of sight or the optical path of optical measurement, making it impossible to conduct effective observation.

[0008] In view of this, the temperature difference environment isolation window frost and fog suppression provided by the present invention includes a connecting cylinder, an observation lens and an aperture assembly. An air inlet nozzle is provided in the connecting cylinder, and a gas input system can be connected through the air inlet nozzle to input corresponding gas into the inner cavity of the connecting cylinder. The observation lens is arranged at one end of the connecting cylinder, and the aperture assembly is installed at the other end of the connecting cylinder, and 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. When the aperture assembly is closed, gas with set temperature and flow is input into the inner cavity of the connecting cylinder to make the inner cavity temperature of the connecting cylinder higher than the ambient temperature in the environmental test chamber, thereby reducing 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, thereby achieving frost suppression.

[0010] At the same time, when the aperture assembly is closed, damping can be applied to the gas output from the connecting cylinder, so that the gas in the connecting cylinder can continue to flow out from the gap of the aperture assembly, so that the inside of the connecting cylinder maintains a slightly positive pressure environment, preventing the external environment gas from flowing in and exchanging heat, thereby forming a local thermal field. In addition, the aperture assembly can be opened. When observation is needed, the aperture assembly can be directly opened for observation, which will not interfere with the line of sight and the optical path of optical measurement, thereby ensuring the effectiveness of observation.

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

[0012] In an optional embodiment of the present application, a plurality of the air inlet nozzles are provided, and the plurality of the air inlet nozzles are evenly distributed along the circumference of the connecting cylinder to ensure uniform and smooth input of the frost-suppressing gas.

[0013] In an optional embodiment of the present application, the length of the connecting cylinder is smaller 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.

[0014] In an optional embodiment of the present application, the connecting cylinder is adapted with a heat-insulating layer to reduce the ambient temperature from being conducted to the inside of the connecting cylinder through the connecting cylinder, so that the inside of the connecting cylinder is always in a constant temperature state.

[0015] In an optional implementation of the present application, the insulation layer is made of foam plastic material to ensure that the insulation layer has sufficient thermal insulation properties.

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

[0017] In an optional embodiment of the present 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 rotation driver, and the movable ring can rotate along its own axis relative to the fixed ring; an aperture plate, wherein a plurality of aperture plates are provided, and the plurality of aperture plates are evenly distributed along the circumference of the fixed ring, and one end of each of the aperture plates is hinged to the fixed ring and the other end is transmission-connected to the movable ring, and the end of the aperture plate connected to the fixed ring can move along the rotation direction of the movable ring; wherein, when the movable ring rotates, the movable ring can drive the plurality of aperture plates to rotate so as to adjust the opening size of the connecting cylinder.

[0018] In an optional embodiment of the present application, when the aperture assembly is closed, the gas flow gap between two adjacent aperture pieces 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 slightly positive pressure local thermal field.

[0019] In a second aspect, the present invention provides a method for suppressing frost and fog on a light window isolated from a temperature difference environment, comprising the following steps:

[0020] The above-mentioned 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 input into the inner cavity of the connecting cylinder, wherein the set temperature is higher than the ambient temperature in the environmental test box.

[0022] The method for suppressing frost and fog on a light window isolated from a temperature difference environment provided by the present invention is to install the above-mentioned frost and fog suppression device on the observation side of an environmental test chamber, and when the aperture assembly is closed, input gas with a set temperature and flow rate into the inner cavity of the connecting cylinder, and the set temperature is higher than the ambient temperature in the environmental test chamber, so that the inner cavity temperature of the connecting cylinder is higher than the ambient temperature in the environmental test chamber, thereby reducing 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, thereby achieving frost suppression.

[0023] Among them, the aperture assembly can apply damping to the gas output from the connecting cylinder, so that the gas in the connecting cylinder can continue to flow out from the gap of the aperture assembly, so that the interior of the connecting cylinder maintains a slightly positive pressure environment, preventing external environmental gas from flowing in and performing heat exchange, thereby forming a local thermal field.

[0024] In summary, the method for suppressing frost and fog on a light window isolated in a temperature difference environment provided by the present invention can effectively suppress frost and dew while avoiding changes in the internal temperature of the environmental test chamber and ensuring the effectiveness of observation.

[0025] In an optional embodiment of the present application, the gas input into the inner cavity of the connecting cylinder is a normal temperature gas, and the input flow rate is 0.003m 3 / s~0.004m 3 / s to ensure that frost on the observation lens can be suppressed while reducing the impact on the temperature in the environmental test chamber.

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

[0027] 1. The temperature difference environment 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 nozzle is arranged in the connecting cylinder, and a gas input system can be connected through the air inlet nozzle to input corresponding gas into the inner cavity of the connecting cylinder. The observation lens is arranged 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, and can input gas of set temperature and flow into the inner cavity of the connecting cylinder when the aperture assembly is closed, so that the inner cavity temperature of the connecting cylinder is higher than the ambient temperature in the environmental test chamber, and the temperature difference on both sides of the observation lens is reduced, so that the ambient temperature near the observation lens is increased to above the current ambient dew point temperature, thereby realizing frost and dew suppression, and damping is applied to the gas output from the connecting cylinder to form a local thermal field. Therefore, while effectively suppressing frost and dew, it is possible to avoid causing changes in the internal temperature of the environmental test chamber and ensure the effectiveness of observation.

[0028] 2. The method for suppressing frost and fog on a light window isolated from a temperature difference environment provided by the present invention is to install the above-mentioned frost and fog suppression device for a light window isolated from a temperature difference environment on the observation side of an environmental test chamber, and when the aperture assembly is closed, input gas with a set temperature and flow rate into the inner cavity of the connecting cylinder, and the set temperature is higher than the ambient temperature in the environmental test chamber, so that the inner cavity temperature of the connecting cylinder is higher than the ambient temperature in the environmental test chamber, thereby reducing 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, thereby suppressing frost and dew, and the aperture assembly can apply damping to the gas output from the connecting cylinder, and apply damping to the gas output from the connecting cylinder to form a local thermal field, thereby effectively suppressing frost and dew while avoiding changes in the internal temperature of the environmental test chamber and ensuring the effectiveness of observation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0030] In the attached picture:

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

[0032] Figure 2 A schematic diagram of the side structure of the connecting cylinder provided in an embodiment of the present invention;

[0033] Figure 3 A schematic structural diagram of an aperture assembly provided in an embodiment of the present invention.

[0034] Marks and corresponding parts names in the attached drawings:

[0035] 10-connecting cylinder, 11-air inlet nozzle, 20-observation lens, 30-aperture assembly, 31-fixing ring, 32-movable ring, 33-aperture piece, 40-mounting structure, 41-observation hole. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

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

[0040] It should be noted that, in the absence of conflict, different features in the embodiments of the present application may be combined with each other.

[0041] In addition, in the manufacture and use of aviation, aerospace, automobiles and high-end equipment, the problem of frost on optical windows seriously affects the clarity of vision and operational safety of the equipment. According to the mechanism of suppressing condensation, the temperature of the optical components needs to be higher than the dew point temperature in the current environment. The dew point temperature is different in different temperature and humidity environments. The calculation formula of the dew point temperature is obtained as follows:

[0042]

[0043] Where T dew is the dew point temperature in degrees Celsius; T is the air temperature in degrees Celsius; RH is the relative humidity; ln represents the natural logarithm. The dew point temperature decreases with the increase of humidity and increases with the increase of ambient temperature. Generally speaking, the dew point temperature is lower than the current ambient temperature. For example, for air with an air temperature of 20°C and a relative humidity of 70%, the dew point temperature is about 14.36 degrees Celsius. Under different working environments of an environmental test chamber for measuring a certain type of aviation equipment, the dew point temperature is approximately distributed in the range of 80°C to -50°C. When the environment in the environmental test chamber changes, the outside of the glass of the optical element is affected by the external air convection and cannot heat up quickly with the environment in the chamber. When the glass surface temperature is lower than the current dew point, fog droplets will appear on the glass surface, and it will condense into frost when the dew point is lower than 0°C.

[0044] From the principle of frost condensation, we know that the key to frost 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 defog, electric heat resistance wire film to defog, etc. However, in the extreme environment of large temperature difference and large diameter optical window, it will not produce effective effect when the amount of hot air is small, and it will cause the temperature inside the equipment to change when the amount of air is too much; and the electric heat resistance wire film will often interfere with the line of sight or the optical path of optical measurement, making it impossible to conduct effective observation.

[0045] In order to solve the above-mentioned problems, the inventor innovatively designed the following technical solution, and the specific implementation scheme of the present application will be described in detail below in conjunction with the accompanying drawings. It should be noted that the defects existing in the above-mentioned solutions in the prior art are the results obtained by the inventor after practice and careful research. Therefore, the discovery process of the above-mentioned technical problems and the solutions proposed in the following embodiments for the above-mentioned problems should all be the contributions made by the inventor to the present application in the process of invention and creation, and should not be understood as the technical content known to those skilled in the art.

[0046] Example 1

[0047] Combination Figure 1 The present embodiment provides a frost and fog suppression for an optical window isolated in a temperature difference environment, comprising: a connecting cylinder 10, the connecting cylinder 10 is open at both ends, and an air inlet nozzle 11 is arranged in the connecting cylinder 10, and the air inlet nozzle 11 is used to connect a gas input system; an observation lens 20, the observation lens 20 is arranged at one end of the connecting cylinder 10; an aperture assembly 30, the 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; wherein, in a 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, and when the aperture assembly 30 is closed, damping can be applied to the gas output from the connecting cylinder 10.

[0048] Combination Figure 2 The air inlet nozzle 11 is a ventilation nozzle connected to 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. Usually, there are multiple air inlet nozzles 11, and the multiple air inlet nozzles 11 are evenly distributed along the circumference of the connecting cylinder 10 to ensure uniform and stable input of frost-inhibiting gas. The specific number of the air inlet nozzles 11 is determined according to the diameter of the connecting cylinder 10. For example, six air inlet nozzles 11 are provided in this embodiment.

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

[0050] It is understandable that the connecting cylinder 10 is adapted to be equipped with an insulation layer to reduce the ambient temperature from being conducted to the inside of the connecting cylinder 10 through the connecting cylinder, so that the inside of the connecting cylinder 10 is always in a constant temperature state. Generally, the insulation layer is made of foam plastic material to ensure that the insulation layer has sufficient heat insulation and thermal insulation properties. Of course, the insulation layer can also be made of insulation materials such as insulation coatings, and can be an insulation layer of a double-layer vacuumized insulation structure.

[0051] Recombination Figure 1 One end of the connecting cylinder 10 is fixedly connected to a mounting structure 40, and an observation hole 41 is provided in the middle of the mounting structure 40; the observation lens 20 is installed in the mounting 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 the rotating driver, and the movable ring 32 can rotate along its own axis relative to the fixed ring 31; an aperture piece 33, wherein the aperture piece 33 is provided with multiple pieces, and the multiple aperture pieces 33 are evenly distributed along the circumference of the fixed ring 31, and one end of each aperture piece 33 is hinged to the fixed ring 31, and the other end is connected to the movable ring 32, and the end of the aperture piece 33 connected to the fixed ring 31 can move along the rotation direction of the movable ring 32, thereby forming a shutter structure; wherein, when the movable ring 32 rotates, the movable ring 32 can drive the multiple aperture pieces 33 to rotate to adjust the opening size of the connecting cylinder 10. That is, the sliding ring is driven to rotate by the rotating driver (such as a motor), and then the aperture piece 33 is driven to rotate, so as to realize the change of the cross-sectional size of the intermediate light passage. Of course, other shutter structures can also be used.

[0053] It can be understood that when the aperture assembly 30 is in a closed state, there is no need to seal between the aperture pieces 33, but the closed gap cannot be too large. It is only necessary to ensure that the constant temperature gas in the connecting cylinder 10 can continue to flow out from the gap between the aperture pieces 33, so that the inner cavity of the connecting cylinder 10 forms a slightly positive pressure environment, avoiding the inflow of external environmental gas and heat exchange to form a local thermal 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 slightly positive pressure local thermal field.

[0055] In summary, the temperature difference environment isolation window frost and fog suppression provided by the present embodiment includes a connecting cylinder 10, an observation lens 20 and an aperture assembly 30. An air inlet nozzle 11 is provided in the connecting cylinder 10, and a gas input system can be connected through the air inlet nozzle 11 to input corresponding gas into the inner cavity of the connecting cylinder 10. The observation lens 20 is arranged at one end of the connecting cylinder 10, and the aperture assembly 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.

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

[0057] At the same time, when the aperture assembly 30 is closed, damping can be applied to the gas output from the connecting cylinder 10, and the constant temperature gas in the connecting cylinder 10 can continue to flow out from the gap between the aperture pieces 33, so that a slightly positive pressure environment is formed in the inner cavity of the connecting cylinder 10, thereby preventing external environmental gas from flowing in and performing heat exchange, 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. When observation is required, the aperture assembly 30 can be directly opened for observation without interfering with the line of sight and the optical path of optical measurement, thereby ensuring the effectiveness of observation. The aperture assembly 30 is only opened when operation is required and is usually kept closed.

[0059] In summary, the temperature difference environment isolation light window frost and fog suppression device provided in this embodiment establishes a slight positive pressure of gas near the observation lens 20, and can maintain the 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 defogger, especially in large-aperture lens observation structures.

[0060] Example 2

[0061] This embodiment provides a method for suppressing frost and fog on a light window isolated from a temperature difference environment, comprising the following steps:

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

[0063] Specifically, in order to solve the problem of frost condensation on the light window of a certain type of environmental chamber, the diameter of the light window glass is 400mm, the temperature inside the environmental chamber is heated from -50℃ to -20℃, and the outside of the environmental chamber is a normal temperature environment of 22℃. In the absence of the temperature difference environment isolation light window frost suppression device recorded in Example 1, the glass temperature change lags behind the temperature inside the environmental chamber, and the glass temperature will be lower than the ambient dew point temperature. At this time, the surface inside the glass will condense into frost. In this regard, the temperature difference environment isolation light window frost suppression device recorded in Example 1 is installed on the observation side of the environmental test chamber.

[0064] S20, closing the aperture assembly 30, and inputting gas with a set temperature and flow rate into the inner cavity of the connecting cylinder 10, wherein the set temperature is higher than the ambient temperature in the environmental test box.

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

[0066] In summary, the method for suppressing frost and fog on a light window isolated from a temperature difference environment provided in the present embodiment is to install the above-mentioned frost and fog suppression device on the observation side of the environmental test chamber, and when the aperture assembly 30 is closed, input gas with a set temperature and flow rate into the inner cavity of the connecting cylinder 10, and the set temperature is higher than the ambient temperature in the environmental test chamber, so that the inner cavity temperature of the connecting cylinder 10 is higher than the ambient temperature in the environmental test chamber, thereby reducing the temperature difference on both sides of the observation lens 20, thereby raising the ambient temperature near the observation lens 20 to above the current ambient dew point temperature, thereby achieving frost suppression.

[0067] Among them, the aperture assembly 30 can apply damping to the gas output from the connecting cylinder 10, and can apply damping to the gas output from the connecting cylinder 10. The constant temperature gas in the connecting cylinder 10 can continuously flow out from the gap between the aperture pieces 33, so that the inner cavity of the connecting cylinder 10 forms a slightly positive pressure environment, avoiding the inflow of external environmental gas and heat exchange, forming a local thermal field, and ensuring that the temperature of the inner cavity of the connecting cylinder 10 remains basically unchanged.

[0068] In summary, the method for suppressing frost and fog on a light window isolated in a temperature difference environment provided in this embodiment can effectively suppress frost and dew while avoiding changes in the internal temperature of the environmental test chamber and ensuring the effectiveness of observation.

[0069] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method 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 in the scope of protection of the present invention.

Claims

1. A frost and fog suppression device for temperature difference environment isolation light window, characterized in that: include: A connecting cylinder (10), the connecting cylinder (10) having openings at both ends, and an air inlet nozzle (11) is arranged inside the connecting cylinder (10), and the air inlet nozzle (11) is used to connect to a gas input system; An observation lens (20), wherein the observation lens (20) is arranged at one end of the connecting cylinder (10); An aperture assembly (30), wherein the aperture assembly (30) is installed at the other end of the connecting cylinder (10), and the aperture assembly (30) is capable of controlling the opening size of the connecting cylinder (10); Wherein, 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, and when the aperture assembly (30) is closed, damping can be applied to the gas output from the connecting cylinder (10).

2. The temperature difference environment isolation light window frost and fog suppression device according to claim 1, characterized in that: A plurality of the air inlet nozzles (11) are provided, and the plurality of the air inlet nozzles (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 smaller 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 adapted to be equipped with a heat-insulating layer.

5. The frost and fog suppression device for temperature difference environment isolation optical window according to claim 4, characterized in that: The thermal 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 a mounting structure (40), and a viewing hole (41) is provided in the middle of the mounting structure (40); The observation lens (20) is installed in the installation structure (40), and the observation lens (20) and the observation hole (41) are coaxially arranged.

7. The frost and fog suppression device for temperature difference environment isolation optical window according to any one of claims 1 to 6, characterized in that: The aperture assembly (30) comprises: A fixing ring (31), wherein the fixing ring (31) is fixedly connected to the connecting cylinder (10); A movable ring (32), the movable ring (32) being used to connect to a rotary driver, and the movable ring (32) being capable of rotating along its own axis relative to the fixed ring (31); Aperture pieces (33), wherein a plurality of aperture pieces (33) are provided, and the plurality of aperture pieces (33) are evenly distributed along the circumference of the fixed ring (31), and one end of each aperture piece (33) is hinged to the fixed ring (31), and the other end is transmission-connected to the movable ring (32), and the end of the aperture piece (33) connected to the fixed ring (31) can move along the rotation direction of the movable ring (32); Wherein, when the movable ring (32) rotates, the movable ring (32) can drive the plurality of aperture plates (33) to rotate, so as to adjust the opening size of the connecting cylinder (10).

8. The frost and fog suppression device for temperature difference environment isolation optical window according to claim 7, characterized in that: When the aperture assembly (30) is in a closed state, the gas flow gap between two adjacent aperture pieces (33) is 0.05 mm to 0.15 mm.

9. A method for suppressing frost and fog on a light window isolated in a temperature difference environment, characterized in that: The following steps are involved: The temperature difference environment isolation light window frost and fog suppression device according to any one of claims 1 to 8 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 in the environmental test box.

10. The method for suppressing frost and fog of a temperature difference environment isolation optical window according to claim 9, characterized in that: The gas input into the inner cavity of the connecting cylinder (10) is a normal temperature gas, and the input flow rate is 0.003m 3 / s~0.004m 3 / s.

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