An anti-frosting air curtain device for a modular low-temperature surface source blackbody

Abstract

The present invention discloses an anti-frost air curtain device for a modular low-temperature surface source blackbody, which includes an air curtain. One side of the air curtain is fixedly installed with a backing plate, and the other side is fixedly installed with a protective front cover. A window partition is movably installed on the protective front cover. The air curtain is provided with a gas inlet, and the air curtain is adapted to introduce external gas through the gas inlet to form an air curtain. The present invention can be installed on the surface of a low-temperature surface source blackbody as a modular component to prevent frosting on the surface of the low-temperature surface source blackbody. It has a simple structure and low cost, and can be applied to a variety of different measured systems.

Description

Technical Field

[0001] The present invention relates to the technical field of optical properties, and in particular to a modular anti-frost air curtain device for a low-temperature surface source blackbody. Background Art

[0002] With the widespread use of measuring equipment such as infrared thermal imagers and spectrometers, blackbodies are essential for calibrating these devices. The temperature range of blackbodies used for infrared calibration varies depending on the test objectives of these devices. Because calibration blackbody equipment is exposed to air, the significant temperature difference between the air and the blackbody's radiating surface during sub-zero-degree Celsius calibration experiments can cause water vapor in the air to condense onto the blackbody's surface, forming frost. This frost significantly affects the thermal imager's response, calling into question the accuracy of measurement results and making them unsuitable for use as a basis for calibration traceability of infrared equipment.

[0003] Since the temperature accuracy of the low-temperature surface source blackbody directly affects the subsequent temperature transfer, in order to prevent the convection heat exchange between the air and the surface of the surface source blackbody during low-temperature operation, resulting in frost and affecting the temperature calibration of the instrument, there are three commonly used solutions: the first is to blow dry gas directly to the surface of the surface source blackbody. The advantage of this solution is that the anti-frost effect is obvious, but due to the difference between the nitrogen temperature and the surface source blackbody temperature, the surface temperature of the surface source blackbody changes significantly, and the temperature accuracy is not high; the second is to encapsulate the surface of the surface source blackbody in a box filled with dry nitrogen and seal it with an optical window. The advantage of this solution is that the design is simple, but due to the optical window The transmittance cannot reach 1, and the window temperature error is introduced, which needs to be corrected when calculating the measurement results. On the other hand, an optical window transmittance of 0.99 or above will also result in high processing costs. The third method is to place the surface source blackbody and the measured system together in a nitrogen-filled cover. The advantage of this solution is that there is no other device between the measured system and the surface source blackbody to introduce temperature errors. However, due to the wide variety of measured systems, there will be measured systems of various volumes, and the distance between the measured system and the surface source blackbody varies. This solution requires the installation of various different covers for various measured systems. The wide variety and large size lead to high costs. In order to address the shortcomings of traditional solutions, finding new solutions has become an important part of the research on low-temperature surface source blackbodies. Summary of the Invention

[0004] The purpose of the present invention is to address the shortcomings of the existing technology and propose a modular anti-frost air curtain device for low-temperature surface source blackbody. The device can be installed on the surface of the low-temperature surface source blackbody as a modular component. It has a simple structure, low cost, and can be applied to a variety of different test systems.

[0005] The technical solution for achieving the purpose of the present invention is:

[0006] A modular anti - frosting air curtain device for a low - temperature surface - source blackbody, including an air curtain. One side of the air curtain is fixedly installed with a backing plate, and the other side is fixedly installed with a protective front cover. A window partition is movably installed on the protective front cover. The air curtain is provided with a gas inlet, and the air curtain is adapted to introduce external gas through the gas inlet to form an air curtain.

[0007] Further, in order to prevent external air from entering the surface of the low - temperature surface - source blackbody through the installation gap between the air curtain and the backing plate, a sealing groove is provided on the side of the backing plate close to the air curtain, and a sealing gasket is provided in the sealing groove to effectively isolate air.

[0008] Further, in order to improve the sealing effect, the sealing gasket is made of silica gel, which has good resilience and excellent physical properties.

[0009] Further, the air curtain includes a frame and a cavity provided in the frame and communicating with the gas inlet. A plurality of small holes communicating with the cavity are provided on the inner wall of the frame. Nitrogen is filled into the cavity through the gas inlet, and nitrogen jets out from each small hole, so as to form a uniform air curtain on the surface of the surface - source blackbody, which can effectively prevent air from convectively exchanging heat with the surface of the surface - source blackbody.

[0010] Further, a through - groove is provided on one side of the protective front cover, and a groove is provided on the inner wall of the other side. The window partition is pulled and fixed by passing through the through - groove and inserting into the groove.

[0011] Further, the window partition is a transparent plexiglass cover, which has high transparency, good processing performance, low cost, and is convenient for observing the surface state of the surface - source blackbody. The temperature calibration between the measured system and the surface of the surface - source blackbody is started and stopped by pulling the window partition.

[0012] Further, in order to facilitate the connection of the pipeline for filling nitrogen, a connector installed on the air curtain is provided at the gas inlet.

[0013] Further, the connector is a quick - connect fitting.

[0014] Adopting the above - mentioned technical solutions, the present invention has the following beneficial effects:

[0015] (1) In the present invention, by connecting the backing plate to the low - temperature surface - source blackbody, external gas enters the air curtain through the gas inlet, so as to form an air curtain in the air curtain, effectively protecting the low - temperature surface - source blackbody and avoiding surface frosting. When the measured system needs to be calibrated using the low - temperature surface - source blackbody, the window partition is pulled out. When the measured system is calibrated, the window partition is promptly inserted into the protective front cover in time, avoiding the temperature error caused by introducing an optical window. The overall adopts a modular design, is installed on the low - temperature surface - source blackbody, has a simple structure and low cost, and can be applied to a variety of different measured systems.

[0016] (2) A sealing groove is provided on one side of the backing plate of the present invention close to the air curtain, and a sealing gasket is provided in the sealing groove, which can effectively isolate air and prevent external air from entering the surface of the low-temperature surface source blackbody through the installation gap between the air curtain and the backing plate.

[0017] (3) The sealing gasket of the present invention is made of silica gel, which has good resilience and excellent physical properties, further improving the sealing effect.

[0018] (4) The air curtain of the present invention is provided with a plurality of small holes. Nitrogen is filled into the cavity of the air curtain through the gas inlet, and the nitrogen is ejected from each small hole, thereby forming a uniform air curtain on the surface of the surface source blackbody, which can effectively prevent the air from convectively exchanging heat with the surface of the surface source blackbody, further improving the anti-frosting effect, and at the same time avoiding the obvious temperature change and low temperature accuracy on the surface of the surface source blackbody caused by directly blowing dry gas onto the surface of the surface source blackbody.

[0019] (5) One side of the protective front cover of the present invention is provided with a through groove, and the inner wall of the other side is provided with a groove. The window partition is pulled and fixed by passing through the through groove and inserting into the groove.

[0020] (6) The window partition of the present invention is a transparent organic glass cover, which has high transparency, good processing performance, low cost, and is convenient for observing the surface state of the surface source blackbody.

[0021] (7) A quick-connect joint is provided at the gas inlet of the present invention, which is convenient for installing a pipeline to connect to an external gas supply unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the content of the present invention easier to be clearly understood, the following further details the present invention according to specific embodiments and in conjunction with the drawings, wherein:

[0023] Figure 1 is a schematic structural diagram of the present invention;

[0024] Figure 2 is a schematic structural diagram of the air curtain of the present invention.

[0025] The reference numerals in the drawings are:

[0026] Air curtain 1, frame 11, cavity 12, small hole 13, backing plate 2, sealing groove 21, protective front cover 3, groove 31, window partition 4, gas inlet 5, sealing gasket 6, joint 7. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] In order to better understand the above technical solutions, the following will detail the above technical solutions in conjunction with the accompanying drawings of the specification and specific embodiments.

[0028] (Embodiment 1)

[0029] As Figures 1 to 2The frost-proof air curtain device for the modular low-temperature surface source blackbody shown in the figure includes an air curtain 1. A backing plate 2 is installed on the right side of the air curtain 1, and a protective front cover 3 is fixedly installed on the left side. The air curtain 1, the backing plate 2, and the protective front cover 3 are fixedly connected into a whole by four screws. The air curtain 1, the backing plate 2, and the protective front cover 3 are all white photosensitive resin 3D printed parts. A window partition 4 that can be pulled up and down is installed on the protective front cover 3. The window partition 4 is a transparent plexiglass cover with high transparency, good processing performance, low cost, and is convenient for observing the surface state of the surface source blackbody. A gas inlet 5 is provided at the top of the air curtain 1. In order to facilitate the connection of the pipeline for filling nitrogen, a connector 7 is installed at the gas inlet 5. The connector 7 is a copper-plated nickel MPL 6-M6 right-angle pneumatic quick-connect fitting, which can quickly connect to PU pipes and nylon pipes. External nitrogen enters the air curtain 1 through the connector 7 to form an air curtain, effectively preventing frost from forming on the surface of the low-temperature surface source blackbody. All these parts form an integral device. As a modular component, it has a simple structure and low cost. For other low-temperature surface source blackbodies, only by scaling up or down this device proportionally can the purpose of frost prevention be quickly achieved, and it can be applied to a variety of different measured systems.

[0030] The air curtain 1 includes a frame 11 and a cavity 12 provided inside the frame 11 and communicating with the gas inlet 5. A plurality of small holes 13 communicating with the cavity 12 are provided on the inner wall of the frame 11. Nitrogen is filled into the cavity 12 through the gas inlet 5, and the nitrogen jets out from each small hole 13, thereby forming a uniform air curtain on the surface of the surface source blackbody, which can effectively prevent the air from convectively exchanging heat with the surface of the surface source blackbody, and at the same time avoid the obvious temperature change on the surface of the surface source blackbody caused by directly blowing dry gas onto the surface of the surface source blackbody and the defect of low temperature accuracy.

[0031] A sealing groove 21 is provided on the side of the backing plate 2 close to the air curtain 1, and a sealing gasket 6 is provided in the sealing groove 21, which effectively isolates the air and prevents external air from entering the surface of the low-temperature surface source blackbody from the installation gap between the air curtain 1 and the backing plate 2. In order to improve the sealing effect, the material of the sealing gasket 6 in this embodiment is silicone, which has good resilience and excellent physical properties. By providing the backing plate 2, the length from the air curtain 1 to the surface of the surface source blackbody is indirectly increased to increase the rotation space of the connector 7, reduce the processing cost caused by the excessive length of the air curtain 1, and at the same time avoid introducing errors to the surface source temperature due to the nitrogen in the air curtain 1 directly blowing onto the surface of the surface source blackbody.

[0032] A through groove is provided on the upper end surface of the protective front cover 3, and a groove 31 is provided on the inner wall of the bottom. The window partition 4 passes through the through groove and is inserted into the groove 31 to achieve pulling and fixing.

[0033] Working process of this embodiment: First, install the gasket 6 in the sealing groove 21 of the backing plate 2, then fix the front protection cover 3, the air curtain 1, and the backing plate 2 together with screws. Insert the window partition 4 from the through groove of the front protection cover 3 into the groove 31 opened at the bottom of the front protection cover 3. Finally, screw the joint 7 to the gas inlet 5 of the air curtain 1 and connect it to the cavity 21. In this way, these parts form an integral device as a modular component. Assemble this component in front of the low-temperature surface source blackbody, connect the joint 7 to an external nitrogen cylinder through a PU tube, and fill a certain amount of nitrogen into the air curtain 1 to form a closed nitrogen curtain. When the system to be measured needs to perform temperature calibration, quickly pull out the window partition 4 upwards. After calibration, quickly insert the window partition 4 into the front protection cover 3. This device can effectively isolate the entry of external air and ensure that no frosting occurs on the surface of the surface source blackbody during the calibration process.

[0034] In this embodiment, by setting the backing plate 2 to be connected to the low-temperature surface source blackbody, external nitrogen enters the air curtain 1 through the gas inlet 5, thereby forming an air curtain in the air curtain 1 to effectively protect the low-temperature surface source blackbody and avoid surface frosting. When the system to be measured needs to be calibrated using the low-temperature surface source blackbody, pull out the window partition 4. When the calibration of the system to be measured is completed, promptly insert the window partition 4 into the front protection cover to avoid the temperature error caused by introducing an optical window. The overall design is modular, with a simple structure and low cost. For other low-temperature surface source blackbodies, only need to scale up or down proportionally to quickly achieve the purpose of anti-frosting, and it can be applied to a variety of different systems to be measured, avoiding placing the surface source blackbody and the system to be measured together in a nitrogen-filled cover, and the need to install various large and diverse covers.

[0035] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A frost-proof air curtain device for a modular low-temperature surface source blackbody, characterized in that: It includes an air curtain (1). One side of the air curtain (1) is fixedly installed with a backing plate (2), and the other side is fixedly installed with a protective front cover (3); a window partition (4) is movably installed on the protective front cover (3). The air curtain (1) is provided with a gas inlet (5), and the air curtain is adapted to introduce external gas through the gas inlet (5) to form an air curtain; one side of the backing plate (2) close to the air curtain (1) is provided with a sealing groove (21), and a sealing gasket (6) is arranged in the sealing groove (21); one side of the protective front cover (3) is provided with a through groove, and the inner wall of the other side is provided with a groove (31). The window partition (4) is pulled and fixed by passing through the through groove and inserting into the groove (31).

2. The anti-frost air curtain device for a modular low-temperature surface source blackbody according to claim 1, characterized in that: The sealing gasket (6) is made of silica gel.

3. The anti-frosting air curtain device for modular low-temperature surface source blackbody according to claim 1, wherein: The air curtain (1) includes a frame (11) and a cavity (12) arranged in the frame (11) and communicating with the gas inlet (5). A plurality of small holes (13) communicating with the cavity (12) are arranged on the inner wall of the frame (11).

4. The anti-frosting air curtain device for a modular low-temperature surface source blackbody according to claim 1, characterized in that: The window partition (4) is a transparent plexiglass cover.

5. The anti-frosting air curtain device for a modular low-temperature surface source blackbody according to claim 1, characterized in that: A joint (7) installed on the air curtain (1) is arranged at the gas inlet (5).

6. The anti-frosting air curtain device for modular low-temperature surface source blackbody according to claim 5, characterized in that: The joint (7) is a quick-connect joint.

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