A sealing structure for a box and a box body

Abstract

This invention discloses a sealing structure and a box body, belonging to the field of box sealing technology. The box body includes a first shell and a second shell. The first shell has a trapezoidal protrusion structure, and the second shell has a trapezoidal sealing groove. The protrusion structure is adapted to the sealing groove. A boat-shaped sealing gasket is provided between the protrusion structure and the sealing groove, which includes a bottom compression part in the middle and inclined pressing parts at both ends. The inclined pressing parts extend outward along the inclined side of the sealing groove. A fastener passes through the protrusion structure, the sealing gasket, and the sealing groove and is detachably connected to the second shell. When the fastener is tightened, the end face of the protrusion structure presses against the bottom compression part, and at the same time, the inclined sides of the protrusion structure press the inclined pressing parts against the inclined inner walls of the sealing groove. This invention amplifies the pre-tightening force of the fastener into a larger lateral extrusion force through the trapezoidal inclined surface cooperation, achieving a three-sided seal between the bottom surface and the two inclined sides, effectively solving the problem of poor airtightness caused by deformation and unstable clamping force of the plastic shell.

Description

Technical Field

[0001] This invention relates to the field of box sealing technology, specifically to a sealing structure for a box and a box body. Background Technology

[0002] In the field of electronic devices, high sealing requirements are placed on the housing. Existing technology includes a plastic housing sealing structure using planar pressing. In this structure, the mating surfaces of the upper and lower shells are flat, and an elastic sealing element is placed between the upper and lower shells. Pressure is applied through fasteners to deform the sealing element, thereby filling the gap between the contact surfaces to achieve a sealing effect. However, this existing structure has significant technical problems: First, flat-plane crimping requires extremely high flatness and roughness of the crimping surface. However, plastic shells are prone to internal stress and deformation during injection molding, making it difficult to achieve ideal flatness and smoothness, resulting in unreliable sealing. Furthermore, the clamping force of the fasteners acts directly on the plastic shell, and the plastic material is prone to creep and relaxation under stress conditions. The shell itself lacks rigidity, making the clamping force unstable. In addition, plastic has a high coefficient of thermal expansion, resulting in poor dimensional stability under pressure differences between the inside and outside of the shell. With long-term use or temperature changes, the sealing performance deteriorates significantly, further increasing the risk of seal failure. Summary of the Invention

[0003] To address the problems existing in the prior art, the present invention provides a sealing structure and a box body for a box body. By enhancing the rigidity of the shell and changing the force distribution at the sealing point to provide a larger and more stable clamping force, the present invention solves the problem of poor airtightness caused by deformation and unstable clamping force in the existing box body structure, and achieves a more reliable sealing effect.

[0004] The technical solution of the present invention is as follows: In a first aspect of the present invention, a sealing structure for a box is provided, the box comprising a first shell and a second shell that are mated together, including a trapezoidal protrusion structure disposed on one side of the first shell and a trapezoidal sealing groove disposed on one side of the second shell, the protrusion structure being adapted to the sealing groove. A sealing gasket is provided between the protruding structure and the sealing groove. The sealing gasket is configured as a boat-shaped structure, including a bottom compression part in the middle and inclined pressing parts at both ends of the bottom compression part. The inclined pressing parts extend outward along the side inclined surface of the sealing groove. It also includes fasteners that pass sequentially through the protruding structure of the first housing, the sealing gasket, and the sealing groove of the second housing, and are detachably connected to the second housing. When the fastener secures the first housing and the second housing, the end face of the protruding structure presses against the bottom compression portion of the sealing gasket, while the two side slopes of the protruding structure press the two side slopes of the sealing gasket against the two side inner wall slopes of the sealing groove.

[0005] In some embodiments of the present invention, the protrusion structure is arranged in a ring along the contour of the first housing, and the sealing groove is arranged in a ring along the contour of the second housing. The protruding structure and the sealing groove are adapted to form an annular mounting surface. Multiple fasteners are provided, and the multiple fasteners are set at a preset distance along the annular mounting surface.

[0006] In some embodiments of the present invention, the protruding structure is provided with two trapezoidal ribs at one end facing the sealing groove, and there is a gap between the ends of the two ribs facing the sealing groove and the fastener. The two ribs are set at a preset distance apart, and the two ribs are pressed against the bottom compression part of the sealing gasket when the fastener is tightened.

[0007] In some embodiments of the present invention, a first through hole is provided at the middle of the two protruding ribs, a second through hole is provided for the sealing gasket, an installation hole is provided at the bottom of the sealing groove, an insert nut is provided in the installation hole, and the fastener passes through the first through hole and the second through hole and is threadedly connected to the insert nut.

[0008] In some embodiments of the present invention, the thickness of the bottom compression portion of the sealing gasket is greater than the thickness of the two inclined pressing portions.

[0009] In some embodiments of the present invention, the angle between the inclined surfaces of the inner walls on both sides of the sealing groove and the bottom surface of the sealing groove is an obtuse angle.

[0010] In some embodiments of the present invention, the inclined pressing part is arranged parallel to the side inclined surface of the protruding structure on the side facing the protruding structure, and the inclined pressing part is arranged parallel to the inner wall inclined surface of the sealing groove on the side facing the sealing groove.

[0011] In some embodiments of the present invention, the outer surface of the first housing is provided with multiple reinforcing structures, the reinforcing structures including annular reinforcing ribs disposed along the edge of the first housing and fishbone-shaped reinforcing ribs distributed inside the annular reinforcing ribs.

[0012] In some embodiments of the present invention, when the fastener fastens the first housing and the second housing, the end face of the protruding structure compresses the bottom compression portion by a preset stroke, and the two inclined pressing portions are pushed by the side inclined surfaces of the protruding structure under the preset compression stroke, resulting in lateral elastic deformation. The ratio of the lateral elastic deformation of the two inclined pressing portions to the preset compression stroke of the bottom compression portion is within a set range.

[0013] In a second aspect of the invention, a box body is provided, employing the aforementioned sealing structure for a box body.

[0014] One or more technical solutions of the present invention have the following beneficial effects: The beveled clamping portion of the sealing gasket is set parallel to the side bevel of the raised structure and the inner wall bevel of the sealing groove, forming a surface contact fit. This reduces the dependence on the flatness of the sealing surface. Even if there are microscopic unevennesses on the sealing surface, the elastic deformation of the sealing gasket can fill the gap, ensuring reliable sealing. The fit between the trapezoidal raised structure and the trapezoidal sealing groove converts the axial preload of the fastener into a normal force on the inner wall bevel of the sealing groove. This normal force allows the beveled clamping portion on both sides of the sealing gasket to obtain a compressive force much greater than the preload of the fastener, resulting in a greater sealing clamping force under the same tightening torque. Furthermore, the sealing gasket is simultaneously compressed on the bottom surface and the two side bevels, forming a three-sided seal. This provides sufficient elastic deformation margin to compensate for dimensional changes caused by thermal expansion and contraction. The two protruding ribs form redundant sealing lines, enabling the sealing structure to maintain long-term stable sealing performance over a wide temperature range and under pressure differences between the inside and outside of the housing.

[0015] In addition, the annular reinforcing ribs and herringbone-shaped reinforcing ribs on the outside of the first housing enhance the structural rigidity of the housing, enabling the housing to maintain dimensional stability when subjected to fastener tension and internal pressure. Combined with the thickness difference between the bottom compression part and the inclined pressing part of the sealing gasket, the sealing gasket can continuously provide stable elastic recovery force and maintain sealing contact pressure when the fasteners loosen or the housing expands and contracts due to thermal expansion and contraction. Attached Figure Description

[0016] Figure 1 This is an assembly diagram of a sealing structure for a box provided in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the first housing and protrusion structure provided in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the second housing and sealing groove provided in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the sealing gasket provided in Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the reinforcing structure provided in Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the force applied to the sealing gasket provided in Embodiment 1 of the present invention.

[0017] In the figure: 1. First housing, 2. Second housing, 3. Sealing gasket, 31. Inclined pressing part, 32. Bottom compression part, 4. Fastener, 5. Insert nut, 6. Protruding structure, 61. Rib, 7. Sealing groove, 8. Reinforcing structure. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Example 1 In a typical embodiment of the present invention, such as Figures 1 to 6 As shown, this embodiment provides a sealing structure for a box, which is applied between a first shell 1 and a second shell 2 that are mated together.

[0020] A trapezoidal protrusion 6 is provided on one side of the first housing 1, and a trapezoidal sealing groove 7 is provided on one side of the second housing 2. The protrusion 6 and the sealing groove 7 are adapted to each other, and the protrusion 6 can be embedded in the sealing groove 7.

[0021] A sealing gasket 3 is provided between the protruding structure 6 and the sealing groove 7. The sealing gasket 3 is configured as a boat-shaped structure. The sealing gasket 3 includes a bottom compression part 32 in the middle and inclined pressing parts 31 provided at both ends of the bottom compression part 32. The inclined pressing parts 31 extend outward along the side inclined surface of the sealing groove 7.

[0022] The sealing gasket 3 is made of an elastomer material that can undergo elastic deformation when subjected to pressure, thereby filling the gap between the raised structure 6 and the sealing groove 7.

[0023] The sealing structure also includes a fastener 4, which passes through the protrusion structure 6 of the first housing 1, the sealing gasket 3, and the sealing groove 7 of the second housing 2 in sequence and is detachably connected to the second housing 2.

[0024] When the fastener 4 fastens the first housing 1 and the second housing 2, the end face of the protruding structure 6 presses the bottom compression part 32 of the sealing gasket 3, and at the same time, the two side slopes of the protruding structure 6 press the two side slopes pressing parts 31 of the sealing gasket 3 against the two side inner wall slopes of the sealing groove 7.

[0025] Since the sealing groove 7 has a trapezoidal structure with inclined surfaces on both sides, the raised structure 6 also has a corresponding inclined surface. The axial tensile force generated by the fastener 4 is transmitted through the inclined surface of the raised structure 6, generating a positive pressure in the normal direction of the inclined surface of the inner wall of the sealing groove 7 that is much greater than the preload of the fastener 4. This positive pressure causes the inclined pressing part 31 of the sealing gasket 3 to form a tight fit with the inclined surface of the inner wall of the sealing groove 7, thereby achieving lateral sealing.

[0026] Simultaneously, the end face of the protruding structure 6 applies pressure to the bottom compression portion 32 of the sealing gasket 3, achieving a bottom seal. Thus, this sealing structure applies pressure to the sealing gasket 3 in three directions—the bottom surface and the two side surfaces—creating a three-sided seal.

[0027] The first housing 1 and the second housing 2 are made of reinforced PPS composite material, which has high strength and heat resistance, making it suitable for electronic device housings with high sealing performance requirements. During the injection molding process, the mold temperature is controlled above 200 degrees Celsius to allow the material to fully crystallize, thereby achieving a mirror-like finish on the sealing surface. The high-gloss sealing surface helps reduce the microscopic gap between the sealing gasket 3 and the housing, further improving sealing reliability.

[0028] like Figure 2 As shown, the protruding structure 6 is arranged in a ring along the contour of the first housing 1. Accordingly, as Figure 3 As shown, the sealing groove 7 is arranged in a ring along the contour of the second housing 2. The ring-shaped protrusion 6 and the sealing groove 7 enable the sealing gasket 3 to form a continuous and closed sealing ring along the entire mating surface of the housing, ensuring complete isolation between the internal space of the housing and the external environment.

[0029] The raised structure 6 and the sealing groove 7 fit together to form an annular mounting surface. Multiple fasteners 4 are provided, and the multiple fasteners 4 are set at preset intervals along the annular mounting surface. By arranging multiple fasteners 4 at intervals on the annular mounting surface, the clamping force can be evenly distributed along the entire annular sealing surface, avoiding insufficient or excessive clamping force in some areas, which could lead to sealing failure.

[0030] The preset distance is determined based on the size of the housing and the sealing requirements. When the housing size is large or the sealing requirements are high, the spacing between the fasteners 4 can be reduced and the number of fasteners 4 can be increased to obtain a more uniform distribution of clamping force.

[0031] like Figure 1 and Figure 2 As shown, the raised structure 6 has two trapezoidal ribs 61 at one end facing the sealing groove 7. There is a gap between the ends of the two ribs 61 facing the sealing groove 7 and the fastener 4. The two ribs 61 are set at a preset distance apart. When the fastener 4 is tightened, the two ribs 61 are pressed against the bottom compression part 32 of the sealing gasket 3.

[0032] The protruding ribs 61 create line or narrow band contact between the end face of the raised structure 6 and the bottom compression portion 32 of the sealing gasket 3. Under the same tightening force, the contact area decreases and the contact pressure increases, thereby improving the specific pressure of the bottom seal. The two protruding ribs 61 simultaneously contact the bottom compression portion 32, forming two independent bottom sealing lines. Even if one sealing line fails for any reason, the other sealing line can still maintain its sealing function, improving the redundancy and reliability of the seal.

[0033] The two protruding ribs 61 adopt a trapezoidal cross-section shape, and their width gradually decreases from the root to the end. This shape is conducive to demolding during injection molding. At the same time, the narrower structure at the end can generate higher local pressure when in contact with the sealing gasket 3, which is conducive to abutting against the micro-unevenness of the sealing gasket 3 surface and achieving a tight fit.

[0034] like Figure 1 As shown, the two protruding ribs 61 are provided with a first through hole at the middle interval, the sealing washer 3 is provided with a second through hole, the bottom of the sealing groove 7 is provided with an installation hole, the installation hole is provided with an insert nut 5, and the fastener 4 passes through the first through hole and the second through hole and is threadedly connected to the insert nut 5.

[0035] Fastener 4 is a screw, and insert nut 5 is pre-embedded in the mounting hole of the second housing 2. The insert nut 5 and the second housing 2 are fixedly connected by injection molding insert process to form a reliable threaded connection base. After the screw passes through the first through hole on the first housing 1 and the second through hole on the sealing washer 3, it is screwed into the insert nut 5 to fasten the first housing 1 and the second housing 2 together.

[0036] The use of insert nut 5 avoids problems such as stripping and creep loosening that may occur when the screw is directly connected to the second plastic housing 2. The metal insert nut 5 has high thread strength and wear resistance, and can withstand multiple disassembly and assembly without damage. At the same time, its coefficient of thermal expansion is similar to that of the screw, resulting in higher connection reliability under temperature change conditions.

[0037] The thickness of the bottom compression portion 32 of the sealing gasket 3 is greater than the thickness of the two inclined pressing portions 31. This thickness difference allows the bottom compression portion 32 to provide a larger compression stroke when the sealing gasket 3 is compressed, while the relatively thinner inclined pressing portions 31 are more likely to undergo lateral elastic deformation under inclined pressure. The greater thickness of the bottom compression portion 32 also gives it better elastic recovery capability, enabling it to continuously provide stable rebound force and maintain sealing contact pressure when the fastener 4 loosens or the housing expands and contracts due to thermal expansion and contraction.

[0038] The angle between the inclined inner walls on both sides of the sealing groove 7 and the bottom surface of the sealing groove 7 is an obtuse angle. This obtuse angle structure means that the opening width of the sealing groove 7 is greater than the bottom width, forming a trapezoidal cross-section shape that is wider at the top and narrower at the bottom. The obtuse angle structure is beneficial for the inclined pressing part 31 of the sealing gasket 3 to slide smoothly along the inclined inner wall of the sealing groove 7 and generate compression deformation when it is pushed by the inclined surface of the protruding structure 6. It is also beneficial for demolding during injection molding.

[0039] The inclined pressing part 31 is arranged parallel to the side inclined surface of the raised structure 6 on the side facing the raised structure 6, and parallel to the inner wall inclined surface of the sealing groove 7 on the side facing the sealing groove 7. This parallel arrangement allows the inclined pressing part 31 of the sealing gasket 3 to form surface contact with the side inclined surface of the raised structure 6 and the inner wall inclined surface of the sealing groove 7, respectively, rather than line contact or point contact. The surface contact method increases the contact area, reduces contact stress, helps protect the surface of the sealing gasket 3 from damage, and at the same time increases the width of the sealing interface, improving the reliability of the seal.

[0040] During the tightening process, as the side slope of the protruding structure 6 moves downward, relative sliding occurs between its slope and the upper surface of the slope pressing part 31. Since the two surfaces are parallel, the pressure distribution on the contact surface is more uniform during the sliding process, avoiding local stress concentration caused by angle mismatch, thereby extending the service life of the sealing gasket 3.

[0041] like Figure 5 As shown, the outer surface of the first housing 1 is provided with multiple reinforcing structures 8. The reinforcing structure 8 includes annular reinforcing ribs arranged along the edge of the first housing 1 and fishbone-shaped reinforcing ribs distributed inside the annular reinforcing ribs.

[0042] Annular reinforcing ribs are continuously arranged along the edge of the first shell 1, forming a closed annular skeleton that provides overall rigidity support to the edge area of ​​the first shell 1. Fishbone-shaped reinforcing ribs are distributed inside the annular reinforcing ribs, their shape resembling a fish skeleton, including a main rib extending longitudinally along the first shell 1 and branch ribs extending from both sides of the main rib. During injection molding, the fishbone-shaped reinforcing ribs effectively resist the internal stress generated by the cooling and shrinkage of the plastic, reducing warping deformation of the first shell 1.

[0043] The combination of annular reinforcing ribs and herringbone-shaped reinforcing ribs constitutes the reinforcing structural system of the first shell 1. The annular reinforcing ribs provide edge support, while the herringbone-shaped reinforcing ribs provide in-plane support. The two work together to enable the first shell 1 to maintain high dimensional stability when subjected to the clamping force of the fasteners 4 and internal pressure, thus preventing sealing failure due to shell deformation.

[0044] When the fastener 4 secures the first housing 1 to the second housing 2, the end face of the protruding structure 6 compresses the bottom compression portion 32 by a preset stroke. Under this preset compression stroke, the side inclined pressing portions 31 are pushed by the side inclined surfaces of the protruding structure 6, resulting in lateral elastic deformation. The ratio of the lateral elastic deformation of the side inclined pressing portions 31 to the preset compression stroke of the bottom compression portion 32 is within a set range.

[0045] The compression preset stroke of the bottom compression part 32 is a direct result of the downward displacement of the fastener 4. It determines the degree to which the sealing gasket 3 is compressed as a whole. It is related to the lateral elastic deformation of the inclined pressing parts 31 on both sides. The greater the lateral elastic deformation, the greater the contact pressure between the inclined pressing part 31 and the inclined inner wall of the sealing groove 7, and the better the lateral sealing effect.

[0046] The set range is predetermined based on the material properties of the sealing gasket 3 and the sealing requirements. If the ratio of lateral elastic deformation to bottom surface compression stroke is too small, it indicates insufficient lateral deformation, and the compressive force between the sealing gasket 3 and the inner wall of the sealing groove 7 is insufficient, failing to form an effective seal. If the ratio is too large, the lateral deformation may exceed the elastic limit of the sealing gasket 3 material, causing permanent deformation or damage to the sealing gasket 3, which in turn affects the reliability of the seal.

[0047] By controlling this ratio within a set range, sufficient lateral compression force is ensured to form a reliable seal, while also ensuring that the sealing gasket 3 operates within a reasonable elastic deformation range, thus avoiding material fatigue or failure. In this embodiment, the lateral elastic deformation of the inclined pressing portions on both sides should be 0.5 to 1.5 times the preset compression stroke of the bottom compression portion.

[0048] like Figure 6 As shown, take a force point P on the trapezoidal inclined surface for analysis. Fv is the bolt preload force on point P, which is perpendicular to the base of the trapezoid. Fn is the normal force of the trapezoidal inclined surface. α is the pressure angle. Fn = Fv / sinα, where α is less than 90 degrees. The smaller α is, the larger Fn is relative to Fv, thus a larger sealing clamping force can be obtained with a smaller screw preload.

[0049] During the assembly process, the sealing gasket 3 is first placed into the sealing groove 7 of the second housing 2 to ensure that the inclined pressing part 31 of the sealing gasket 3 fits against the inclined inner wall of the sealing groove 7. Then, the protruding structure 6 of the first housing 1 is aligned with the position of the sealing groove 7, so that the protruding structure 6 is embedded in the sealing groove 7 and contacts the sealing gasket 3; Next, fastener 4 is passed through the first through hole on the first housing 1 and the second through hole on the sealing washer 3 in sequence, and screwed into the insert nut 5 of the second housing 2; During the tightening of fastener 4, the axial tension of fastener 4 pulls the first housing 1 downward, and the protruding structure 6 gradually enters deeper into the sealing groove 7. The end face of the protruding structure 6 first contacts the bottom compression part 32 of the sealing gasket 3 and begins to compress the bottom compression part 32. As the fastener 4 continues to tighten, the side slope of the protruding structure 6 begins to contact and push the slope pressing part 31 of the sealing gasket 3. Under the pushing of the side slope of the protruding structure 6, the slope pressing part 31 undergoes lateral elastic deformation along the inner wall slope of the sealing groove 7 and adheres tightly to the inner wall slope of the sealing groove 7. When the fastener 4 is tightened to the predetermined torque, the end face of the protruding structure 6 compresses the bottom compression part 32 by a predetermined stroke, and the two inclined pressing parts 31 also generate corresponding lateral elastic deformation.

[0050] At this time, the bottom surface and two sides of the sealing gasket 3 are simultaneously subjected to compression force, forming a three-sided seal. The bottom compression part 32 forms a bottom seal between the end face of the protruding structure 6 and the bottom surface of the sealing groove 7, and the side slope pressing parts 31 form a side seal between the side slopes of the protruding structure 6 and the inner wall slope of the sealing groove 7.

[0051] When the ambient temperature changes, the first housing 1 and the second housing 2, made of plastic, will expand and contract due to thermal expansion and contraction. Because the sealing gasket 3 is elastic and its three-sided pressure structure provides a large elastic deformation margin, the sealing gasket 3 can compensate for the dimensional changes caused by thermal expansion and contraction, keeping the sealing contact pressure within the effective range.

[0052] This housing uses a sealing structure that is particularly suitable for electronic device housings with high sealing performance requirements. Through a trapezoidal inclined surface reinforcement structure and a three-sided sealing design, the plastic housing can achieve or even exceed the sealing performance of the metal housing, ensuring sealing effect while reducing cost and weight.

[0053] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A sealing structure for a box body, the box body comprising a first shell and a second shell that are mated and fitted together, characterized in that, It includes a trapezoidal protrusion structure disposed on one side of the first housing and a trapezoidal sealing groove disposed on one side of the second housing, wherein the protrusion structure is adapted to the sealing groove; A sealing gasket is provided between the protruding structure and the sealing groove. The sealing gasket is configured as a boat-shaped structure, including a bottom compression part in the middle and inclined pressing parts at both ends of the bottom compression part. The inclined pressing parts extend outward along the side inclined surface of the sealing groove. It also includes fasteners that pass sequentially through the protruding structure of the first housing, the sealing gasket, and the sealing groove of the second housing, and are detachably connected to the second housing. When the fastener secures the first housing and the second housing, the end face of the protruding structure presses against the bottom compression portion of the sealing gasket, while the two side slopes of the protruding structure press the two side slopes of the sealing gasket against the two side inner wall slopes of the sealing groove.

2. The sealing structure for a box as described in claim 1, characterized in that, The protruding structure is arranged in a ring along the contour of the first housing, and the sealing groove is arranged in a ring along the contour of the second housing. The protruding structure and the sealing groove are adapted to form an annular mounting surface. Multiple fasteners are provided, and the multiple fasteners are set at a preset distance along the annular mounting surface.

3. The sealing structure for a box as described in claim 2, characterized in that, The raised structure has two trapezoidal ribs at one end facing the sealing groove. There is a gap between the ends of the two ribs facing the sealing groove and the fastener. The two ribs are set at a preset distance apart. When the fastener is tightened, the two ribs are pressed against the bottom compression part of the sealing gasket.

4. The sealing structure for a box as described in claim 3, characterized in that, The two protruding ribs are provided with a first through hole at the middle interval, the sealing gasket is provided with a second through hole, the bottom of the sealing groove is provided with a mounting hole, the mounting hole is provided with an insert nut, and the fastener passes through the first through hole and the second through hole and is threadedly connected to the insert nut.

5. A sealing structure for a box as described in claim 1, characterized in that, The thickness of the bottom compression portion of the sealing gasket is greater than the thickness of the inclined pressing portions on both sides.

6. A sealing structure for a box as described in claim 1, characterized in that, The angle between the inclined surfaces of the inner walls on both sides of the sealing groove and the bottom surface of the sealing groove is an obtuse angle.

7. A sealing structure for a box as described in claim 1, characterized in that, The inclined pressing part is arranged parallel to the side inclined surface of the protruding structure on the side facing the protruding structure, and the inclined pressing part is arranged parallel to the inner wall inclined surface of the sealing groove on the side facing the sealing groove.

8. A sealing structure for a box as described in claim 1, characterized in that, The outer surface of the first housing is provided with multiple reinforcing structures, including annular reinforcing ribs arranged along the edge of the first housing and fishbone-shaped reinforcing ribs distributed inside the annular reinforcing ribs.

9. A sealing structure for a box as described in claim 1, characterized in that, When the fastener secures the first housing and the second housing, the end face of the protruding structure compresses the bottom compression part by a preset stroke. The two inclined pressing parts on both sides are pushed by the side inclined surfaces of the protruding structure under the preset compression stroke, resulting in lateral elastic deformation. The ratio of the lateral elastic deformation of the two inclined pressing parts to the preset compression stroke of the bottom compression part is within a set range.

10. A box body, characterized in that, The sealing structure for the box body is adopted as described in any one of claims 1-9.

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