Explosion-proof window structure and thermal imager

Abstract

The application relates to the technical field of explosion-proof monitoring equipment, in particular to an explosion-proof window structure and a thermal imager. The explosion-proof window structure comprises a cylinder body; a first shell connected with the cylinder body and forming a first window opening; a window glass fixed to one side of the first shell facing the cylinder body and covering the first window opening; and a second shell arranged on the side of the first shell away from the window glass and forming a second window opening, the second window opening extending along the axial direction of the cylinder body relative to the first window opening and being in communication with the first window opening to form a window opening; wherein an explosion-proof gap is formed between the first shell and the second shell, and the explosion-proof gap is arranged on the outer circumferential side of the window opening. According to the simple structure, the window structure has sufficient impact resistance, the window glass is not shielded, the first shell and the second shell are arranged to form a strong impact-resistant structure, the cost is relatively low, excessive mounting structures are not needed for fixation, and the structure is relatively simple.

Description

Technical Field

[0001] This application relates to the field of explosion-proof monitoring equipment technology, and in particular to explosion-proof window structure and thermal imager. Background Technology

[0002] Explosion-proof thermal imagers are primarily used as image acquisition devices. They capture infrared energy through natural light passing through a front-facing window, using a built-in thermal sensing element to obtain and output an image. Existing explosion-proof thermal imagers mainly achieve this by placing a perforated metal plate between two layers of germanium glass, thus allowing infrared light to pass through while blocking impact forces to meet explosion-proof standards.

[0003] However, this structural setup has drawbacks. Due to the high price of germanium glass, using double-layer germanium glass increases the overall cost of the explosion-proof thermal imager. It also requires more advanced installation, resulting in a larger number of auxiliary components for installation and fixation, making the structure more complex. Furthermore, the metal perforated plate has a dense array of holes, which may cause some of the light passing through the germanium glass to be scattered and blocked, affecting the thermal sensing element's reception of infrared energy. Utility Model Content

[0004] Therefore, it is necessary to provide an explosion-proof window structure and thermal imager that is simple in structure, low in cost, has sufficient impact resistance, does not obstruct the viewing window glass, and can improve the accuracy of the thermal imager.

[0005] To solve the above-mentioned technical problems, this application provides the following technical solution:

[0006] An explosion-proof viewing window structure includes: a cylindrical body; a first housing connected to the cylindrical body and forming a first viewing window; a viewing window glass fixed to the side of the first housing facing the cylindrical body and covering the first viewing window; and a second housing disposed on the side of the first housing away from the viewing window glass and forming a second viewing window, the second viewing window extending relative to the first viewing window along the axial direction of the cylindrical body and communicating with the first viewing window to form a viewing window; wherein an explosion-proof gap is formed between the first housing and the second housing, the explosion-proof gap surrounding the outer periphery of the viewing window.

[0007] Understandably, this application utilizes a second housing on the side of the first housing away from the window glass to absorb external impact forces, thus dissipating the impact before it reaches the first housing. An explosion-proof gap is formed between the second and first housings. When the impact is strong, the second housing has deformation space, preventing the impact from being transmitted to the first housing, thus giving the window structure sufficient impact resistance. Furthermore, the first viewing window on the first housing and the second viewing window on the second housing are connected to form a viewing window, ensuring that the window glass covering the first viewing window is not obstructed, preventing the transmitted light from being blocked or scattered, thereby improving the accuracy of light acquisition. Simultaneously, the use of a double-housing structure combined with a single piece of germanium glass creates a highly impact-resistant window structure, eliminating the need for complex installation structures for auxiliary positioning and installation, resulting in a simpler and lower-cost installation.

[0008] This application, through a simple structural design, enables the viewing window structure to have sufficient impact resistance while avoiding obstruction of the viewing window glass, thereby improving the accuracy of the thermal imager. Furthermore, the combination of the first and second housings creates a strong impact-resistant structure with relatively low cost and no need for excessive installation structures for fixation, resulting in a simple structure.

[0009] In some embodiments, the second housing includes a second main body portion and a protrusion, the protrusion being disposed between the second main body portion and the first housing to form an explosion-proof gap between the second main body portion and the first housing.

[0010] In some embodiments, the number of protrusions is m, and the m protrusions are spaced apart and evenly distributed along the circumferential direction of the second main body, wherein 3≤m≤6.

[0011] Understandably, limiting the number of protrusions to 3 to 6 can minimize the contact area between the second and first housings while satisfying the installation relationship between them. This ensures a larger explosion-proof gap and minimizes the impact force absorbed by the second housing from being transmitted to the first housing due to an excessively large contact area between the two housings, thereby increasing the impact resistance of the explosion-proof window structure.

[0012] In some embodiments, the thickness of the protrusion is d1, where 0.2mm ≤ d1 ≤ 0.5mm.

[0013] Understandably, the thickness of the protrusion affects the size of the explosion-proof gap. Setting it to 0.2mm≤d1 ensures that the size of the explosion-proof gap can meet the maximum deformation of the second shell. Furthermore, setting d1≤0.5mm can prevent the explosion-proof gap from being too large, which would result in an excessively large overall volume of the explosion-proof window structure and affect the light collection of the window glass. It can also prevent the protrusion from being too thick, which would cause the second shell to break due to excessive deformation after a strong impact, thus improving the overall structural strength of the explosion-proof window structure.

[0014] In some embodiments, the explosion-proof window structure further includes a buffer pad disposed between the second housing and the first housing, and the buffer pad is located near the window of the relative protrusion to absorb the impact force of the second housing deforming toward the first housing.

[0015] Understandably, the buffer pad can absorb some of the impact force and prevent the external impact force from continuing to be transmitted towards the window glass. That is, under the dual effect of the structural stress relief of the second shell and the absorption of impact energy by the buffer pad, it can effectively prevent the window glass from breaking and causing the explosion-proof failure, thus giving the explosion-proof window structure a sufficiently strong impact resistance.

[0016] In some embodiments, the thickness d2 of the cushioning pad and the thickness d1 of the protrusion satisfy: d2≥d1.

[0017] It is understandable that the buffer pad has a certain deformation capacity. With d2≥d1, when the second shell is subjected to a large impact force, the deformation of the buffer pad can absorb part of the impact force, avoid excessive deformation of the second shell, and further improve the structural impact resistance of the explosion-proof window structure.

[0018] In some embodiments, the protrusion and the second body portion are integrated.

[0019] Understandably, the integrated design reduces the connection structure between the protrusion and the second main body, increases the structural strength of the second housing, prevents the second housing from breaking at its connection structure due to impact, and extends its service life.

[0020] In some embodiments, the minimum cross-sectional diameter of the second viewing window based on the axial direction of the cylinder is D, where 13.5 mm ≤ D ≤ 17.5 mm.

[0021] Understandably, this design ensures that the size of the second viewing window is sufficient to prevent direct impact from breaking the window glass, thus guaranteeing that the explosion-proof window structure has sufficiently strong impact resistance and that the second viewing window is large enough to ensure its light transmittance and uniform energy distribution on the heat-sensing element.

[0022] In some embodiments, along the axial direction of the cylinder, the cross-sectional diameter of the viewing window gradually increases from the first viewing window to the second viewing window.

[0023] Understandably, this setting increases the light transmission range of the viewport.

[0024] This application also provides the following technical solutions:

[0025] A thermal imager, including the explosion-proof viewing window structure in any of the above embodiments.

[0026] The explosion-proof viewing window structure and thermal imager utilize a first housing with a viewing window glass and a second housing on the side of the first housing away from the viewing window glass. The second housing absorbs external impact forces, dissipating them before they reach the first housing. An explosion-proof gap is formed between the first and second housings. When the impact force is strong, the second housing has deformation space, preventing the impact force from being transmitted to the first housing, thus giving the viewing window structure sufficient impact resistance. Furthermore, the first viewing window formed on the first housing and the second viewing window on the second housing are connected to form a viewing window, ensuring that the viewing window glass covering the first viewing window is not obstructed, preventing the transmitted light from being blocked or scattered, and improving the accuracy of light acquisition. At the same time, the double-housing structure combined with a piece of germanium glass forms a highly impact-resistant viewing window structure, eliminating the need for complex installation structures for auxiliary positioning and installation, resulting in a simpler installation structure and lower cost.

[0027] This application, through a simple structural design, enables the viewing window structure to have sufficient impact resistance while avoiding obstruction of the viewing window glass, thereby improving the accuracy of the thermal imager. Furthermore, the combination of the first and second housings creates a strong impact-resistant structure with relatively low cost and no need for excessive installation structures for fixation, resulting in a simple structure. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a top view schematic diagram of the thermal imager provided in this application.

[0030] Figure 2 Provided for this application Figure 1 A schematic diagram of the cross-sectional structure at point AA.

[0031] Figure 3 Provided for this application Figure 1 A schematic diagram of the cross-sectional structure at point BB.

[0032] Figure 4 Provided for this application Figure 3 A magnified structural diagram at point C.

[0033] Figure 5 Provided for this application Figure 2 A magnified structural diagram at point E in the middle.

[0034] Figure 6 Provided for this application Figure 2 A magnified structural diagram at point F in the middle.

[0035] The component labels are as follows:

[0036] 100. Explosion-proof viewing window structure; 10. Cylinder body; 20. First shell; 21. First viewing window; 22. First main body; 23. Extension; 24. First boss; 25. First fastener; 26. Peripheral side wall; 27. Sealing ring; 28. First limiting groove; 30. Viewing window glass; 40. Second shell; 41. Second viewing window; 42. Second main body; 43. Protrusion; 44. Second fastener; 45. Second boss; 46. Buffer gap; 47. Second limiting groove; 50. Viewing window; 60. Explosion-proof gap; 70. Buffer pad; 80. Adhesive joint; 200. Thermal imager. Detailed Implementation

[0037] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0038] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0040] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0042] Please see Figure 1 This application provides a thermal imager 200, including an explosion-proof window structure 100. Natural light is transmitted through the explosion-proof window structure 100, and the infrared energy in the transmitted light is collected by the built-in thermal sensing element to obtain and output an image.

[0043] Existing thermal imagers are sometimes used in complex scenarios such as industrial monitoring or hazardous environment image acquisition. To avoid damage caused by the viewing window structure, they usually need to be equipped with an explosion-proof viewing window structure to avoid increasing maintenance costs and extend service life.

[0044] Please see Figures 2 to 6 This application provides an explosion-proof viewing window structure 100, which, through a simple structural design, provides sufficient impact resistance without obstructing the viewing window glass 30, thereby improving the accuracy of the thermal imager 200, reducing structural costs, and extending service life.

[0045] The explosion-proof viewing window structure 100 may include a cylindrical body 10, a first housing 20, a viewing window glass 30, and a second housing 40. The first housing 20 is connected to the cylindrical body 10 and forms a first viewing window 21. The viewing window glass 30 is fixed to the side of the first housing 20 facing the cylindrical body 10 and covers the first viewing window 21. The second housing 40 is located on the side of the first housing 20 away from the viewing window glass 30 and forms a second viewing window 41. The second viewing window 41 extends relative to the first viewing window 21 along the axial direction of the cylindrical body 10 and communicates with the first viewing window 21 to form a viewing window 50. An explosion-proof gap 60 is formed between the first housing 20 and the second housing 40, and the explosion-proof gap 60 surrounds the outer periphery of the viewing window 50.

[0046] It is understood that this application, by placing the viewing glass 30 on the first housing 20 and placing the second housing 40 on the side of the first housing 20 away from the viewing glass 30, utilizes the second housing 40 to absorb external impact forces, so that the impact force is dissipated before reaching the first housing 20, and forms an explosion-proof gap 60 between the second housing 40 and the first housing 20. When the impact force is strong, the second housing 40 has deformation space, preventing the impact force from continuing to be transmitted to the first housing 20, so that the viewing window structure has sufficient impact resistance. Furthermore, the first viewing window 21 formed on the first housing 20 and the second viewing window 41 on the second housing 40 are connected to form a viewing window 50, so that the viewing glass 30 covering the first viewing window 21 is not blocked, and the transmitted light of the viewing glass 30 is not blocked or scattered, which can improve its accuracy of light collection. At the same time, the structure of double housing combined with a piece of germanium glass forms a strong impact-resistant viewing window structure, which does not require a complicated installation structure for auxiliary positioning and installation, and the installation structure is relatively simple and low in cost. In other words, through a simple structural design, the viewing window structure has sufficient impact resistance while avoiding obstruction of the viewing window glass 30, thus improving the accuracy of the thermal imager 200. Furthermore, the combination of the first housing 20 and the second housing 40 forms a strong impact-resistant structure with relatively low cost and no need for excessive installation structures for fixation, resulting in a simple structure.

[0047] In one embodiment, the first housing 20 and the second housing 40 are made of stainless steel or aluminum alloy. This design enables both to have strong impact resistance. Of course, the specific materials used for the first housing 20 and the second housing 40 can be determined according to actual conditions and requirements.

[0048] like Figures 2 to 3 As shown, the first housing 20 has a first main body portion 22 and an extension portion 23 connected to each other. The extension portion 23 is located on the side of the first main body portion 22 facing the viewing window glass 30. The extension portion 23 extends into the interior of the cylinder 10 and is fitted to the inner wall of the cylinder 10. The extension portion 23 and the main body portion form a limiting step, which is located on the upper wall surface of the cylinder 10 in the axial direction of the cylinder 10. Thus, the extension portion 23 can increase the overall structural strength and reliability of the explosion-proof viewing window structure 100, and the formed limiting step can serve as an installation reference for the first housing 20, facilitating the assembly of the first housing 20 and the cylinder 10.

[0049] Furthermore, the first housing 20 is fixed to the peripheral wall 26 of the cylinder 10 by the first fastener 25.

[0050] For example, the first fastener 25 is a screw. Of course, it is not limited to this, the first housing 20 can also be fixedly connected to the cylinder 10 by means of threaded fasteners, welding, riveting or snap-fit.

[0051] Furthermore, multiple first fasteners 25 are provided, and these multiple first fasteners 25 are evenly and spaced apart along the circumferential direction of the cylinder 10. This further increases the stability and reliability of the assembly between the first housing 20 and the cylinder 10.

[0052] Optionally, the first fixing member 25 can be set to two, three, or five. Of course, it is not limited to this, and the specific number of the first fixing members 25 can be determined according to the actual size of the cylinder 10 and the first shell 20.

[0053] In one embodiment, the first housing 20 is further provided with a first boss 24 on the side facing the viewing window glass 30 along the axial direction of the cylindrical body 10, and the first boss 24 is embedded in the peripheral sidewall 26 of the cylindrical body 10. In this way, the assembly stability and connection strength between the first housing 20 and the cylindrical body 10 can be further increased.

[0054] Furthermore, the explosion-proof viewing window structure 100 also includes a sealing ring 27, which is fitted onto the extension 23 and seals against the cylinder 10 at the limiting step. It is understood that when the first housing 20 and the cylinder 10 are press-fitted together, the sealing ring 27 can prevent structural damage caused by rigid contact between the first housing 20 and the cylinder 10, and achieve a seal between the first housing 20 and the cylinder 10.

[0055] In one embodiment, the viewing window 30 is germanium glass.

[0056] like Figure 1 and Figure 4 As shown, the second housing 40 includes a second main body portion 42 and a protrusion 43. The protrusion 43 is disposed between the second main body portion 42 and the first housing 20, so that an explosion-proof gap 60 is formed between the second main body portion 42 and the first housing 20.

[0057] In one embodiment, the number of protrusions 43 is m, and the m protrusions 43 are spaced apart and evenly distributed along the circumferential direction of the second main body 42, wherein 3≤m≤6. It is understood that limiting the number of protrusions 43 to 3 to 6 can, while satisfying the installation relationship between the second housing 40 and the first housing 20, minimize the contact area between the second housing 40 and the first housing 20, ensuring the formation of a large explosion-proof gap 60, so as to minimize the transmission of the impact force absorbed by the second housing 40 to the first housing 20 due to an excessively large contact area between the two housings, thereby increasing the impact resistance of the explosion-proof window structure 100.

[0058] The number of protrusions 43 can be 3, 4, 5, or 6. In this embodiment, the number of protrusions 43 is 3.

[0059] It should be explained that the protrusions 43 are distributed in a dotted manner along this side of the second main body 42, and the area of ​​the multiple protrusions 43 on this side of the second main body 42 is very small, so that the area of ​​the explosion-proof gap 60 formed between the second housing 40 and the first housing 20 is relatively large.

[0060] The second main body 42 and the protrusion 43 can be configured as a single unit. Understandably, this single-unit configuration reduces the connection structure between the protrusion 43 and the second main body 42, increases the structural strength of the second housing 40, prevents the second housing 40 from breaking at the connection structure due to impact, and extends its service life.

[0061] In one embodiment, the thickness of the protrusion 43 is d1, where 0.2mm ≤ d1 ≤ 0.5mm. It is understood that the thickness of the protrusion 43 affects the size of the explosion-proof gap 60. Setting it to 0.2mm ≤ d1 ensures that the size of the explosion-proof gap 60 can meet the maximum deformation of the second housing 40. Furthermore, setting d1 ≤ 0.5mm avoids the explosion-proof gap 60 being too large, which would result in an excessively large overall volume of the explosion-proof window structure 100, affecting the light collection of the window glass 30. It also prevents the protrusion 43 from being too thick, which could cause the second housing 40 to break due to excessive deformation after a strong impact, thus improving the overall structural strength of the explosion-proof window structure 100.

[0062] The value of d1 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, etc. Of course, it is not limited to these values, and the specific value of d1 can be determined according to the actual situation.

[0063] In one embodiment, the second housing 40 is fixed to the first housing 20 by a second fastener 44.

[0064] The second fastener 44 can be a screw, but it is not limited to this. The second housing 40 can also be fixedly connected to the first housing 20 by means of threaded fasteners, welding, riveting or snap-fitting.

[0065] Furthermore, the second fastener 44 is located at the boss position on the second main body 42. Based on the axial direction of the cylinder 10, the cross-sectional area of ​​the boss is greater than or equal to the cross-sectional area of ​​the second fastener 44. In this way, the connection strength between the second housing 40 and the first housing 20 can be increased, and the second fastener 44 can be made too large, thus avoiding affecting the overall structural layout and structural strength of the second housing 40.

[0066] In this embodiment, the second fixing member 44 has a cross-sectional diameter of 2.5 mm based on the axial direction of the cylinder 10, and the number of second fixing members 44 is set to three; the boss has a cross-sectional diameter of 3 mm based on the axial direction of the cylinder 10. This avoids the boss being too large and affecting the explosion-proof performance of the explosion-proof gap 60. Of course, the number and size of the second fixing members 44 are not limited to these, and the size of the boss is not limited to these either; it can be set according to actual conditions. The second fixing member 44 can be an M2.5 screw.

[0067] like Figure 2 and Figure 6 As shown, along the axial direction of the cylinder 10, the second housing 40 is provided with a second protrusion 45 on the side facing the first housing 20, and the first housing 20 is provided with a first limiting groove 28 at a corresponding position. The second protrusion 45 is embedded in the first limiting groove 28. With this configuration, the second protrusion 45 can serve as an installation reference for the second housing 40, enabling the second housing 40 to be precisely assembled and connected with the first housing 20. It can also limit the second housing 40 along the circumferential direction of the cylinder 10. At the same time, the provision of the second protrusion 45 can increase the structural strength of the second housing 40, further increasing the structural strength of the explosion-proof window structure 100.

[0068] Furthermore, along the axial direction of the cylinder 10, a buffer gap 46 is provided between the second boss 45 and the first limiting groove 28. This provides a buffer space along the axial direction of the cylinder 10 towards the first housing 20 when the second housing 40 is impacted, preventing the impact force from being transmitted to the first housing 20. This further enhances the explosion-proof performance of the explosion-proof window structure 100 and prevents the window glass 30 installed in the first housing 20 from being damaged by impact.

[0069] In one embodiment, the view window 50 is rectangular.

[0070] Please continue to refer to this. Figure 2 and Figure 3 Based on the axial direction of the cylinder 10, the second viewing window 41 has a cross-section, and due to the variation in the size of the second viewing window 41, it can have a minimum cross-sectional diameter. The minimum cross-sectional diameter of the second viewing window 41 based on the axial direction of the cylinder 10 is D, 13.5mm≤D≤17.5mm. This setting ensures that the size of the second viewing window 41 is sufficient to prevent impact objects from directly hitting the viewing glass 30 and causing the viewing glass 30 to break, thus ensuring that the explosion-proof viewing window structure 100 has sufficiently strong impact resistance, and also ensures that the second viewing window 41 is large enough to ensure its light transmittance and uniform energy distribution on the thermal sensing element.

[0071] The value of D can be 13.5mm, 14mm, 15.5mm, 16mm, 17.5mm, etc. Of course, it is not limited to these values; the specific value of D can be determined according to the actual situation. When the viewport 50 is set as a rectangle, the diameter D refers to the width of the rectangle.

[0072] In one embodiment, along the axial direction of the cylinder 10, the cross-sectional diameter of the viewing window 50 gradually increases from the first viewing window 21 to the second viewing window 41. This arrangement increases the light transmission range of the viewing window 50 and ensures that a large amount of infrared energy is received by the thermal sensing element of the thermal imager 200, thereby improving the accuracy of the thermal imager 200.

[0073] like Figure 2 As shown, the explosion-proof window structure 100 also includes a buffer pad 70, which is disposed between the second housing 40 and the first housing 20. The buffer pad 70 is located near the viewing window 50 on the opposite protrusion 43 to absorb the impact force of the deformation of the second housing 40 toward the first housing 20. It can be understood that the buffer pad 70 can absorb part of the impact force and prevent the external impact force from continuing to be transmitted toward the viewing window glass 30. That is, under the dual action of the structural stress relief of the second housing 40 and the absorption of impact energy by the buffer pad 70, the explosion-proof failure caused by the breakage of the viewing window glass 30 can be effectively prevented, thereby giving the explosion-proof window structure 100 sufficiently strong impact resistance.

[0074] Furthermore, the thickness of the buffer pad 70 is d2, satisfying: d2≥d1. It can be understood that the buffer pad 70 has a certain deformation capacity. The setting of d2≥d1 means that when the second shell 40 is subjected to a large impact force, the deformation of the buffer pad 70 can absorb part of the impact force, avoiding excessive deformation of the second shell 40, thereby further improving the structural impact resistance of the explosion-proof window structure 100.

[0075] In one embodiment, along the axial direction of the cylinder 10, the second housing 40 is provided with a second limiting groove 47 on one side facing the first housing 20, and a portion of the buffer pad 70 is embedded in the second limiting groove 47.

[0076] Furthermore, along the axial direction of the cylinder 10, an adhesive portion 80 is filled between the buffer pad 70 and the first housing 20. This increases the stability of the connection between the buffer pad 70 and the first housing 20.

[0077] Preferably, the buffer pad 70 is embedded in the first housing 20.

[0078] In this application, the second housing 40 and the explosion-proof gap 60 can absorb the impact from the explosion-proof window structure 100, providing a first layer of barrier against the impact. When the impact force is too large and can continue to be transmitted behind the second housing 40, the buffer pad 70 is used to further absorb the force, so that the impact force transmitted to the window glass 30 is reduced or eliminated, thereby achieving strong impact resistance of the explosion-proof window structure 100 and preventing the window glass 30 from breaking. At the same time, there is no structural obstruction in front of the window 50, which can ensure that the infrared energy is fully received by the thermal sensing element and that the energy distribution on the thermal sensing element is uniform, providing a technical basis for the high precision of the thermal imager.

[0079] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0080] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. An explosion-proof viewing window structure, characterized in that, include: cylindrical body; A first housing is connected to the cylindrical body and forms a first viewing window; A viewing window is fixed to the side of the first housing facing the cylinder and covers the first viewing window; as well as The second housing is disposed on the side of the first housing away from the viewing window glass and forms a second viewing window. The second viewing window extends along the axial direction of the cylinder relative to the first viewing window and communicates with the first viewing window to form a viewing window. An explosion-proof gap is formed between the first housing and the second housing, and the explosion-proof gap surrounds the outer periphery of the viewing window.

2. The explosion-proof viewing window structure according to claim 1, characterized in that, The second housing includes a second main body and a protrusion, the protrusion being disposed between the second main body and the first housing, so that the explosion-proof gap is formed between the second main body and the first housing.

3. The explosion-proof viewing window structure according to claim 2, characterized in that, The number of protrusions is m, and the m protrusions are spaced apart and evenly distributed along the circumferential direction of the second main body, wherein 3≤m≤6.

4. The explosion-proof viewing window structure according to claim 2, characterized in that, The thickness of the protrusion is d1, where 0.2mm≤d1≤0.5mm.

5. The explosion-proof viewing window structure according to claim 2, characterized in that, The explosion-proof window structure also includes a buffer pad, which is disposed between the second housing and the first housing, and the buffer pad is located near the window relative to the protrusion, so as to absorb the impact force of the second housing deforming towards the first housing.

6. The explosion-proof viewing window structure according to claim 5, characterized in that, The thickness d2 of the buffer pad and the thickness d1 of the protrusion satisfy the condition: d2≥d1.

7. The explosion-proof viewing window structure according to claim 2, characterized in that, The protrusion and the second main body are integrated.

8. The explosion-proof viewing window structure according to claim 1, characterized in that, The minimum cross-sectional diameter of the second viewing window based on the axial direction of the cylinder is D, where 13.5mm ≤ D ≤ 17.5mm.

9. The explosion-proof viewing window structure according to claim 1, characterized in that, Along the axial direction of the cylinder, the cross-sectional diameter of the viewing window gradually increases from the first viewing window to the second viewing window.

10. A thermal imager, characterized in that, The explosion-proof window structure includes any one of claims 1 to 9.

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