Window air curtain protection structure and measuring device

Abstract

The utility model discloses a window air curtain protection structure and a measuring device.The window air curtain protection structure comprises a sample window body, an air flow cavity is formed in the sample window body, a feeding pipe is arranged at one end of the sample window body in a penetrating mode, and a recycling connector communicated with the air flow cavity is formed in the other end of the sample window body; the recovery interface is used for recovering a to-be-tested sample sprayed from the tail end of the feeding pipe, and an observation window for observing the sprayed to-be-tested sample is arranged on the side wall of the sample window body; the protective air knife is arranged on the side wall of the sample window body, the protective air knife is located on the side, away from the recovery interface, of the observation window, an air cavity, a diffusion channel and a rectification channel which are sequentially communicated are formed in the protective air knife, and the end, away from the diffusion channel, of the rectification channel is communicated with the airflow cavity; the cross-sectional area of the rectification channel is smaller than that of the diffusion channel. The end, away from the diffusion channel, of the rectification channel faces the recovery connector. According to the embodiment provided by the invention, the measured sample can be prevented from being adhered to the window.

Description

Technical Field

[0001] This application relates to the field of automation technology, and in particular to a window air curtain protection structure and measuring device. Background Technology

[0002] Currently, the measuring device is used in a harsh environment. In such an environment, the measuring window is easily soiled, resulting in frequent window cleaning. In addition, there is a lot of dust on site, making it inconvenient to disassemble the window and difficult to clean, requiring frequent manual maintenance. Utility Model Content

[0003] The following is an overview of the subject matter described in detail herein, and this overview is not intended to limit the scope of the claims.

[0004] This application provides a window air curtain protection structure and measuring device, which can prevent the measurement sample from sticking to the window, thereby reducing the frequency and difficulty of cleaning the window.

[0005] A first aspect of this application provides a window air curtain protection structure, comprising: a sample window, wherein an airflow cavity is disposed inside the sample window, a feed pipe is inserted through one end of the sample window and the end of the feed pipe is located inside the airflow cavity, and a recovery interface communicating with the airflow cavity is disposed at the other end of the sample window, the recovery interface being used to recover the sample to be tested ejected from the end of the feed pipe, and an observation window is disposed on the side wall of the sample window for observing the ejected sample to be tested; and a protective air knife disposed on the side wall of the sample window, the protective air knife being located on the side of the observation window away from the recovery interface, wherein an air cavity, a diffusion channel, and a rectification channel are disposed inside the protective air knife in sequence, the end of the rectification channel away from the diffusion channel being connected to the airflow cavity, the cross-sectional area of ​​the rectification channel being smaller than the cross-sectional area of ​​the diffusion channel, the air cavity being used to introduce compressed air, the end of the rectification channel away from the diffusion channel facing the recovery interface, and the protective air knife being used to guide the compressed air into the airflow cavity along the diffusion channel and the rectification channel.

[0006] In some embodiments, the system further includes an air intake pipe, wherein the air intake end and the air outlet end of the air intake pipe are not on the same straight line, the air cavity is shaped as a long strip extending in the vertical direction, the air outlet end is connected to the air cavity, and the air intake pipe is used to introduce compressed air into the air cavity.

[0007] In some embodiments, there are multiple intake pipes, and each intake pipe is arranged side by side in the vertical direction.

[0008] In some embodiments, the height of the diffusion channel and the rectification channel is the same as the length of the air cavity.

[0009] In some embodiments, the junction between the diffusion channel and the rectifier channel is bent.

[0010] To achieve the above objectives, a second aspect of the present application provides a measuring device, including the window air curtain protection structure described in the first aspect.

[0011] In some embodiments, a gas chamber baffle is further included. The gas chamber baffle is disposed on the side of the sample window away from the recovery interface. The gas chamber baffle includes a first baffle, a second baffle, and a third baffle. There are two first baffles and two third baffles. The two first baffles are disposed opposite each other on the sample window and are connected by a second baffle. The two third baffles are perpendicular to the first baffles respectively. The two third baffles and the second baffles are connected in pairs. The feed pipe passes through the second baffle and at the connection point of the two third baffles.

[0012] In some embodiments, the device further includes a washer and a retaining ring, the washer being mounted on the second baffle, the retaining ring being fixed to the second baffle by the washer, and the feed pipe passing through the retaining ring and the washer.

[0013] In some embodiments, the device further includes a flow divider, disposed at one end of the feed pipe near the recycling interface, wherein the flow divider extends in the same direction as the axial direction of the feed pipe and is wider in the middle and narrower at both ends.

[0014] In some embodiments, the sample window is further comprising: a muffler box disposed at one end of the sample window away from the recycling interface, the muffler box being wrapped around the sample window.

[0015] The embodiments of this application include at least the following beneficial effects: By setting an airflow cavity inside the sample window, and inserting a feed pipe through one end of the sample window, with the end of the feed pipe located inside the airflow cavity, and setting a recovery interface communicating with the airflow cavity at the other end of the sample window, the sample to be tested can be ejected from the end of the feed pipe and recovered at the recovery interface after the sample is placed in the feed pipe. Furthermore, the ejected sample can be observed through an observation window set on the side wall of the sample window. In addition, a protective air knife is also provided on the side wall of the sample window. The protective air knife has an air cavity, a diffusion channel, and a rectification channel connected in sequence inside, and compressed air is introduced into the air cavity, so that the compressed air... The system consists of a sequential flow ventilation cavity, a diffusion channel, and a rectification channel. Since the cross-sectional area of ​​the rectification channel is smaller than that of the diffusion channel, the air velocity in the rectification channel is increased. The end of the rectification channel away from the diffusion channel is connected to the airflow cavity, allowing high-speed compressed air to rush into the airflow cavity from the rectification channel. Because the protective air knife is located on the side of the observation window away from the recovery interface, the high-speed compressed air will flow through the observation window and form an air curtain in front of the observation window to prevent the ejected test sample from adhering to the observation window, thereby ensuring that the observation window is clean, reducing the frequency of window cleaning, enabling long-term maintenance-free operation, reducing the difficulty of window cleaning, and improving the efficiency of each window cleaning.

[0016] Other features and advantages of this application will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the description, claims and drawings. Attached Figure Description

[0017] The accompanying drawings are used to provide a further understanding of the technical solutions of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions of this application.

[0018] Figure 1 A cross-sectional schematic diagram of the window air curtain protection structure and measuring device provided in the embodiments of this application;

[0019] Figure 2 This is a schematic diagram of the structure of the protective air knife provided in the embodiments of this application;

[0020] Figure 3 This is a schematic diagram of the structure of the observation window provided in the embodiments of this application;

[0021] Figure 4 This is a schematic diagram of the intake pipe provided in an embodiment of this application;

[0022] Figure 5This is a schematic diagram of the main body of the measuring device provided in the embodiments of this application;

[0023] Figure 6 This is a schematic diagram of the measuring device provided in an embodiment of this application. Detailed Implementation

[0024] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0025] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. 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.

[0026] In the description of this application, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0027] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0028] Currently, the environment in which the online measurement window is used is quite harsh. In such an environment, the measurement window is easily soiled, resulting in frequent window cleaning. In addition, there is a lot of dust on site, making it inconvenient to disassemble the window and difficult to clean, requiring frequent manual maintenance.

[0029] To address the issues of frequent and challenging cleaning of online measurement windows, this application provides a window air curtain protection structure and measuring device. The window air curtain protection structure includes: a sample window with an internal airflow cavity; a feed pipe passing through one end of the sample window, with its end located within the airflow cavity; a recovery interface connected to the airflow cavity at the other end of the sample window, used to recover the sample ejected from the end of the feed pipe; an observation window on the side wall of the sample window for observing the ejected sample; and a protective air knife mounted on the side wall of the sample window, located on the side of the observation window away from the recovery interface. The protective air knife contains a sequentially connected air cavity, a diffusion channel, and a rectifying channel. The end of the rectifying channel away from the diffusion channel is connected to the airflow cavity, and the cross-sectional area of ​​the rectifying channel is smaller than that of the diffusion channel. The air cavity is used to introduce compressed air, and the end of the rectifying channel away from the diffusion channel faces the recovery interface. The protective air knife guides the compressed air along the diffusion channel and the rectifying channel into the airflow cavity. According to the solution provided in the embodiments of this application, an airflow cavity is set inside the sample window, and a feed pipe is inserted through one end of the sample window, with the end of the feed pipe located inside the airflow cavity. A recovery interface communicating with the airflow cavity is set at the other end of the sample window. Therefore, after the sample to be tested is placed in the feed pipe, the sample can be ejected from the end of the feed pipe and recovered at the recovery interface. Furthermore, the ejected sample can be observed through an observation window set on the side wall of the sample window. In addition, a protective air knife is also set on the side wall of the sample window. The protective air knife has an air cavity, a diffusion channel, and a rectifier channel connected in sequence inside. Compressed air is introduced into the air cavity, causing the compressed air to flow through the air cavity... The secondary flow ventilation cavity, diffusion channel, and rectifier channel, because the cross-sectional area of ​​the rectifier channel is smaller than that of the diffusion channel, result in a faster airflow velocity within the rectifier channel. Furthermore, the end of the rectifier channel furthest from the diffusion channel is connected to the airflow cavity, allowing high-speed compressed air to rush into the airflow cavity from the rectifier channel. Since the protective air knife is located on the side of the observation window furthest from the recovery interface, the high-speed compressed air flows through the observation window and forms an air curtain in front of it, preventing the ejected test sample from adhering to the observation window. This ensures a clean observation window, reduces the frequency of window cleaning, enables long-term maintenance-free operation, reduces the difficulty of window cleaning, and improves the efficiency of each window cleaning. The embodiments of this application will be further described below with reference to the accompanying drawings.

[0030] Reference Figures 1 to 2 , Figure 1 This is a cross-sectional schematic diagram of the window air curtain protection structure and measuring device provided in an embodiment of this application. Figure 2 This is a schematic diagram of the structure of the protective air knife provided in the embodiments of this application. The first aspect of the embodiments of this application provides a window air curtain protection structure, including:

[0031] The sample window 100 has an airflow cavity 110 inside. One end of the sample window 100 is provided with a feed pipe 120, the end of which is located inside the airflow cavity 110. The other end of the sample window 100 is provided with a recovery interface 130 that communicates with the airflow cavity 110. The recovery interface 130 is used to recover the sample to be tested ejected from the end of the feed pipe 120. The side wall of the sample window 100 is provided with an observation window 140, which is used to observe the ejected sample to be tested.

[0032] A protective air knife 200 is installed on the side wall of the sample window 100. The protective air knife 200 is located on the side of the observation window 140 away from the recovery interface 130. The protective air knife 200 has an air cavity 210, a diffusion channel 220 and a rectifier channel 230 connected in sequence inside. The end of the rectifier channel 230 away from the diffusion channel 220 is connected to the airflow cavity 110. The cross-sectional area of ​​the rectifier channel 230 is smaller than that of the diffusion channel 220. The air cavity 210 is used to introduce compressed air. The end of the rectifier channel 230 away from the diffusion channel 220 faces the recovery interface 130. The protective air knife 200 is used to guide the compressed air into the airflow cavity 110 along the diffusion channel 220 and the rectifier channel 230.

[0033] The sample window 100 is elongated in shape, and can be a cuboid, ellipsoid, or cylinder, but this embodiment is not limited thereto.

[0034] The number of observation windows 140 can be two. The two observation windows 140 are respectively set opposite to each other on the two side walls of the sample window 100. The projection of one observation window 140 on the plane of the other observation window 140 coincides with the other observation window 140, so that the laser can be transmitted and the laser can illuminate the sample to be tested through the observation window 140, thereby testing the sample to be tested. The testing process of the sample to be tested can be observed in the observation window 140. The number of protective air knives 200 can also be two. Each protective air knife 200 corresponds one-to-one with each observation window 140. The two protective air knives 200 are respectively set opposite to each other on the two side walls of the sample window 100, and the two protective air knives 200 are located on the side of the corresponding observation window 140 away from the recovery interface 130.

[0035] Among them, reference Figure 3 , Figure 3 The present invention provides a schematic diagram of the structure of the observation window 140. The observation window 140 may include optical glass 141 and a pressure ring 142. The optical glass 141 is mounted on the pressure ring 142, and the pressure ring 142 is threadedly connected to the sample window 100.

[0036] The recovery port 130 is connected to a negative pressure machine (not shown in the figure). The negative pressure generated by the negative pressure machine causes the airflow in the airflow chamber 110 to flow to the recovery port 130, so that the sample to be tested ejected from the feed pipe 120 can flow to the recovery port 130 along the airflow, so that the recovery port 130 can recover the sample to be tested. In addition, the sample to be tested in the feed pipe 120 is also affected by the negative pressure and ejected from the feed pipe 120.

[0037] The negative pressure machine can use a dust collector, but this embodiment is not limited to it.

[0038] Understandably, the funnel-shaped shape of the recycling port 130 allows the sample to be tested to gradually slow down and concentrate as it enters the recycling port. The smooth inner wall and tapering design facilitate the cleaning of residues, reduce cleaning difficulty, shorten maintenance time, and make it easier to check for foreign matter residues. In addition, the funnel-shaped structure can buffer the impact force when the material falls, reducing the noise generated by the material hitting the hard surface.

[0039] It should be noted that the cross-sectional area of ​​the rectifier channel 230 is smaller than that of the diffuser channel 220. For example, the cross-sectional area of ​​the rectifier channel 230 is 0.01 square meters, while the cross-sectional area of ​​the diffuser channel 220 can be 0.05 square meters.

[0040] Understandably, when compressed air enters the air chamber 210, it will gradually slow down and be evenly distributed within the air chamber 210, making the airflow more stable. Then, the compressed air flows within the diffusion channel 220, initially adjusting the airflow direction and speed, which can optimize the airflow characteristics and make the airflow as compatible as possible with the rectifier channel 230, thereby enabling the ejected airflow to form a more stable and uniform air curtain.

[0041] Based on this, an airflow cavity 110 is provided inside the sample window 100, and a feed pipe 120 is provided through one end of the sample window 100, with the end of the feed pipe 120 located inside the airflow cavity 110. A recovery interface 130 communicating with the airflow cavity 110 is provided at the other end of the sample window 100. Therefore, after the sample to be tested is placed in the feed pipe 120, the sample can be ejected from the end of the feed pipe 120 and recovered at the recovery interface 130. The ejected sample can also be observed through an observation window 140 provided on the side wall of the sample window 100. Furthermore, a protective air knife 200 is provided on the side wall of the sample window 100. The protective air knife 200 has an air cavity 210, a diffusion channel 220, and a rectifying channel 230 connected in sequence inside. Compressed air is introduced into the air cavity 210, causing the compressed air to... The secondary flow ventilation cavity 210, diffusion channel 220, and rectifier channel 230 have a smaller cross-sectional area than the diffusion channel 220. As a result, the air velocity in the rectifier channel 230 is increased. The end of the rectifier channel 230 away from the diffusion channel 220 is connected to the airflow cavity 110, allowing high-speed compressed air to rush from the rectifier channel 230 into the airflow cavity 110. Since the protective air knife 200 is located on the side of the observation window 140 away from the recovery interface 130, the high-speed compressed air will flow through the observation window 140 and form an air curtain in front of the observation window 140 to prevent the sample to be tested from adhering to the observation window 140. This ensures that the observation window 140 is clean, reduces the frequency of window cleaning, and enables long-term maintenance-free operation. It also reduces the difficulty of window cleaning and improves the efficiency of each window cleaning.

[0042] Additionally, refer to again Figure 1 and Figure 2 and reference Figure 4 , Figure 4 The diagram shows the structure of the air intake pipe provided in the embodiments of this application. In some embodiments of this application, the air intake pipe 300 is also included. The air intake end 310 and the air outlet end 320 of the air intake pipe 300 are not on the same straight line. The shape of the air cavity 210 is a long strip extending in the vertical direction. The air outlet end 320 is connected to the air cavity 210. The air intake pipe 300 is used to introduce compressed air into the air cavity 210.

[0043] The air inlet 310 and the air outlet 320 can be perpendicular to each other, and the bends of the air inlet 310 and the air outlet 320 are rounded.

[0044] It is understandable that the air cavity 210 can be cylindrical, with the air outlet 320 perpendicularly inserted into the curved surface of the air cavity 210. One side wall of the diffusion channel is tangent to the curved surface of the air cavity 210, and the other side wall of the diffusion channel is perpendicular to the curved surface of the air cavity 210. The diffusion channel 220 is perpendicular to the air outlet 320. Compressed air enters the air cavity 210 and flows along the curved surface of the air cavity 210 to the diffusion channel 220. The smooth curved surface can reduce the turbulence and friction generated when the compressed air passes through, and reduce the instability of the airflow.

[0045] Based on this, the air inlet end 310 and the air outlet end 320 of the air inlet pipe 300 are not on the same straight line. Before the compressed air enters the air cavity 210, the flow rate of the compressed air is initially slowed down, so that more of the compressed air can be used to fill the air cavity 210. Then, together with another small part of the compressed air, it flows to the diffusion channel 220, which can improve the stability of the airflow. In addition, the shape of the air cavity 210 is a long strip extending in the vertical direction, which shapes the flow of compressed air into a sheet, thus obtaining the prototype of the air curtain.

[0046] Additionally, refer to Figure 1 , Figure 2 , Figure 4 and Figure 5 , Figure 5 This is a schematic diagram of the main body of the measuring device provided in the embodiments of this application. In some embodiments of this application, there are multiple air inlet pipes 300, and each air inlet pipe 300 is arranged side by side in the vertical direction.

[0047] The vertical projections of each intake pipe 300 coincide, and the distance between each intake pipe 300 is approximately equal.

[0048] Based on this, it is equivalent to inserting each air intake pipe 300 into the air cavity 210 side by side. Since the air cavity 210 is elongated, a single air intake pipe 300 cannot fill the entire air cavity 210 evenly and quickly. Therefore, multiple air intake pipes 300 can simultaneously introduce compressed air into various parts of the air cavity 210, so that various parts of the air cavity 210 can be filled at the same rate. This can improve the rate at which the entire air cavity 210 is filled with compressed air, improve the uniformity of compressed air in the air cavity 210, thereby improving the smoothness of compressed air flow and the stability of the air curtain.

[0049] In addition, in some embodiments of the application, the height of the diffusion channel 220 and the rectification channel 230 is the same as the length of the air cavity 210.

[0050] Based on this, the height of the diffusion channel 220 and the rectifier channel 230 is the same as the length of the air cavity 210, so that the compressed air will not flow in the vertical direction and produce a significant acceleration effect. When the compressed air is ejected from the protective air knife 200, it avoids the air curtain formed from blowing the sample to be tested in the vertical direction, and avoids too much sample to be tested adhering to the top or bottom of the sample window 100, thereby improving the cleanliness of the entire sample window 100.

[0051] Additionally, refer to again Figure 1 and Figure 2 In some embodiments of this application, the connection between the diffusion channel 220 and the rectifier channel 230 is bent.

[0052] The connection between the diffusion channel 220 and the rectifier channel 230 is rounded.

[0053] It should be noted that the rectifying channel 230 can be perpendicular to the side wall of the sample window where the protective air knife 200 is located. The two side walls of the rectifying channel 230 are parallel to each other. The rectifying channel 230 bends away from the sample window, so that a small angle is formed between the rectifying channel 230 and the side wall of the sample window where the protective air knife 200 is located, which is equivalent to the angle between the air curtain formed by compressed air and the observation window 140.

[0054] Based on this, compressed air can be ejected at an angle relative to the observation window 140 to form an air curtain, preventing the measured sample from sticking to the glass when it is ejected from the feed pipe 120, thus ensuring that the observation window 140 is clean and achieving the purpose of long-term use and no need for manual maintenance in the short term.

[0055] Reference Figures 1 to 6 , Figure 6 This is a schematic diagram of the structure of a measuring device provided in an embodiment of this application. According to the second aspect of this application, the measuring device includes the window air curtain protection structure described in the first aspect.

[0056] Additionally, refer to again Figure 1 and Figure 5 In some embodiments of this application, a gas chamber baffle 150 is also included. The gas chamber baffle 150 is disposed on the side of the sample window 100 away from the recovery interface 130. The gas chamber baffle 150 includes a first baffle 151, a second baffle 152, and a third baffle 153. There are two first baffles 151 and two third baffles 153. The two first baffles 151 are disposed opposite to each other on the sample window 100. The two first baffles 151 are connected to each other through the second baffle 152. The two third baffles 153 are perpendicular to the first baffles 151 respectively. The two third baffles 153 and the second baffle 152 are connected in pairs. The feed pipe 120 passes through the second baffle 152 and passes through the connection between the two third baffles 153.

[0057] The portion of the sample window furthest from the recycling interface 130 is thicker than the portion closest to the recycling interface 130. The portion of the sample window furthest from the recycling interface 130 is connected to the portion closest to the recycling interface 130 via a square plate 160.

[0058] The first baffle 151, the second baffle 152 and the third baffle 153 have the same shape. The shape of the first baffle 151, the second baffle 152 and the third baffle 153 can all be rectangular. This embodiment of the present disclosure is not limited to this.

[0059] The first baffle 151 can be set horizontally, therefore, the second baffle 152 and the third baffle 153 are both perpendicular to the horizontal plane.

[0060] The edges of the two first baffles 151 away from the sample window 100 are respectively connected to the upper and lower edges of the second baffle 152. The two first baffles 151 are located in the hollow area enclosed by the four vertices of the sample window, so that the airflow inside the sample window 100 is connected to the outside air.

[0061] It should be noted that the two third baffles 153 and the second baffle 152 are connected in pairs to form a prism with a triangular base, and external air can flow into the airflow cavity 110 along the surface of the two third baffles 153.

[0062] Based on this, external air can flow into the airflow cavity 110 along the surfaces of the two third baffles 153, so that the outside air only converges after entering the airflow cavity 110, which can reduce the turbulence caused by direct convergence and improve the stability and uniformity of the airflow inside the airflow cavity 110.

[0063] Additionally, refer to again Figure 1 and Figure 5 In some embodiments of this application, a washer 170 and a fixing ring 171 are also included. The washer 170 is mounted on the second baffle 152, and the fixing ring 171 is fixed on the second baffle 152 by the washer 170. The feed pipe 120 passes through the fixing ring 171 and the washer 170.

[0064] Based on this, the feed pipe 120 passes through the fixing ring 171 and the gasket 170, which can reduce the vibration of the feed pipe 120 caused by material impact or airflow. Then, the gasket 170 is installed on the second baffle 152, and the fixing ring 171 is fixed on the second baffle 152 through the gasket 170, which can also reduce the vibration transmitted to the second baffle 152, thereby reducing the vibration of the entire sample window 100 and improving the stability and reliability of the entire measuring device.

[0065] Additionally, refer to Figure 1In some embodiments of this application, a diverter plate 180 is provided on one end of the feed pipe 120 near the recovery interface 130. The extension direction of the diverter plate 180 is consistent with the axial direction of the feed pipe 120, and it is wide in the middle and narrow at both ends.

[0066] The flow divider 180 can be a right prism with a rhomboid bottom surface. The bottom surface of the flow divider 180 coincides with the axis of the feed pipe 120. The plane enclosed by the two opposite side edges of the flow divider 180 coincides with the axis of the feed pipe 120. The maximum width of the flow divider 180 is less than the inner diameter of the airflow cavity 110.

[0067] Based on this, before the airflow flows along the airflow cavity 110 to the end of the feed pipe 120, the airflow first flows through the flow divider 180. Since the extension direction of the flow divider 180 is consistent with the axial direction of the feed pipe 120, and the flow divider 180 is wide in the middle and narrow at both ends, the gap between the flow divider 180 and the inner wall of the airflow cavity 110 gradually decreases as the airflow flows through the flow divider 180, that is, the cross-sectional area of ​​the airflow carrier gradually decreases. Since the airflow rate is constant, the airflow velocity gradually increases. When the airflow flows through the middle of the flow divider 180, the width of the flow divider 180 is the widest, the gap between the flow divider 180 and the inner wall of the airflow cavity 110 is the smallest, and the airflow velocity reaches its maximum. At this time, the gap areas formed between the two widest ends of the flow divider 180 and the left and right inner walls of the airflow cavity 110 constitute the airflow injection zone. Then the airflow is sprayed... The high-speed jet stream formed in the injection zone continues to flow towards the outlet of the feed pipe 120. Again, thanks to the shape of the flow divider 180, which is wide in the middle and narrow at both ends, the lines connecting the leftmost and rightmost ends of the flow divider 180 are diagonal. According to the principle of fluid adhesion effect, the jet stream will be adsorbed by the rear surface of the flow divider 180. That is, the jet stream will adhere to the rear surface of the flow divider 180 and the outer wall of the feed pipe 120. Since the flow divider 180 is close to the outlet of the feed pipe 120, when sample particles are ejected from the outlet of the feed pipe 120, the sample particles will be squeezed by the jet streams on both sides and flow towards the center of the test area. The sample particles will not contact the inner wall surface of the observation window 140, effectively preventing the observation window 140 from being scratched and contaminated by the sample particles.

[0068] Additionally, refer to Figure 1 and Figure 6 In some embodiments of this application, a silencer box 190 is provided at one end of the sample window 100 away from the recycling interface 130, and the silencer box 190 is wrapped around the sample window 100.

[0069] The sound-absorbing box 190 may contain sound-absorbing material to further absorb noise. The sound-absorbing material may be sound-absorbing sponge, rock wool, foam plastic, or mineral fiber board. This embodiment of the present disclosure is not limited to these materials.

[0070] Based on this, by setting the silencing box 190 at the end of the sample window 100 away from the recycling interface 130 and wrapping it around the sample window 100, the noise emitted by the sample window 100 can be absorbed, thereby reducing the impact of background noise on the test results during the test process.

[0071] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A window air curtain protection structure, characterized in that, include: The sample window has an internal airflow cavity. One end of the sample window is provided with a feed pipe, the end of which is located inside the airflow cavity. The other end of the sample window is provided with a recovery interface communicating with the airflow cavity. The recovery interface is used to recover the sample to be tested ejected from the end of the feed pipe. The side wall of the sample window is provided with an observation window for observing the ejected sample to be tested. A protective air knife is disposed on the side wall of the sample window, located on the side of the observation window away from the recovery interface. The protective air knife has an air cavity, a diffusion channel, and a rectifying channel connected in sequence inside. The end of the rectifying channel away from the diffusion channel is connected to the airflow cavity. The cross-sectional area of ​​the rectifying channel is smaller than that of the diffusion channel. The air cavity is used to introduce compressed air. The end of the rectifying channel away from the diffusion channel faces the recovery interface. The protective air knife is used to guide the compressed air into the airflow cavity along the diffusion channel and the rectifying channel.

2. The window air curtain protection structure according to claim 1, characterized in that, It also includes an air inlet pipe, wherein the air inlet end and the air outlet end of the air inlet pipe are not on the same straight line, the shape of the air cavity is a long strip extending in the vertical direction, the air outlet end is connected to the air cavity, and the air inlet pipe is used to introduce compressed air into the air cavity.

3. The window air curtain protection structure according to claim 2, characterized in that, There are multiple air intake pipes, and each air intake pipe is arranged side by side in the vertical direction.

4. The window air curtain protection structure according to claim 2, characterized in that, The height of the diffusion channel and the rectification channel is the same as the length of the air cavity.

5. The window air curtain protection structure according to claim 1, characterized in that, The diffusion channel and the rectifier channel are bent at their connection point.

6. A measuring device, characterized in that, Includes the window air curtain protection structure as described in any one of claims 1 to 5.

7. The measuring device according to claim 6, characterized in that, It also includes a gas chamber baffle, which is disposed on the side of the sample window away from the recovery interface. The gas chamber baffle includes a first baffle, a second baffle, and a third baffle. There are two first baffles and two third baffles. The two first baffles are disposed opposite each other on the sample window and are connected by the second baffle. The two third baffles are perpendicular to the first baffles respectively. The two third baffles and the second baffles are connected in pairs. The feed pipe passes through the second baffle and passes through the connection point of the two third baffles.

8. The measuring device according to claim 7, characterized in that, It also includes a washer ring and a fixing ring. The washer ring is installed on the second baffle plate, and the fixing ring is fixed to the second baffle plate by the washer ring. The feed pipe passes through the fixing ring and the washer ring.

9. The measuring device according to claim 7, characterized in that, Also includes: A flow divider is disposed on one end of the feed pipe near the recycling interface. The flow divider extends in the same direction as the axial direction of the feed pipe and is wider in the middle and narrower at both ends.

10. The measuring device according to claim 7, characterized in that, Also includes: A silencer box is disposed at the end of the sample window away from the recycling interface, and the silencer box is wrapped around the sample window.

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