Airtight door assembly

Abstract

The invention provides an airtight door assembly comprising a first side door frame, a second side door frame, a threshold, a first buckle structure, and a threshold airtight strip. The threshold is detachably disposed between the first door frameand the second side door frame. The threshold has an upper surface and a first end. The first buckle structure is positioned at the first end and configured to fix the threshold to the first side door frame. The threshold airtight strip is disposed on the upper surface of the threshold and covers the first buckle structure.

Description

[Technical Field]

[0001] This invention relates to an airtight door assembly, and more particularly to an airtight door assembly for use in cleanrooms in the pharmaceutical industry. [Previous Technology]

[0002] Cleanrooms are widely used in the biopharmaceutical industry, encompassing specialized areas such as operating rooms, pharmaceutical manufacturing facilities, biosafety laboratories, and animal facilities. Maintaining the cleanliness level of cleanrooms is crucial to ensuring that manufactured medical products meet stringent regulatory requirements and to prevent cross-contamination on the production line. Especially when producing high-precision products such as cell preparations, the stability of the cleanroom not only affects product quality but also directly impacts patient safety. The cleanliness level of a cleanroom primarily depends on the airtightness of its airtight doors. If the airtightness of the doors is insufficient, unfiltered external air and contaminants may seep in, weakening the stability of the pressure difference between the inside and outside of the cleanroom and reducing the efficiency of the air conditioning system, thereby increasing the risk of cross-contamination and energy consumption. Furthermore, the performance of the airtight doors is a key indicator determining whether a cell preparation manufacturing facility meets ISO 14644, GMP, and FDA standards. Therefore, ensuring high airtightness of the doors effectively maintains the protective barrier function of the cleanroom, stabilizing cleanliness and reducing operational risks and costs.

[0003] Airtight doors inevitably come into contact with the ground during opening and closing, resulting in friction and wear. Therefore, the airtight design at the bottom of the door is usually the most challenging part of the overall airtight structure. Existing technologies typically use external or embedded airtight strips to achieve bottom airtightness. However, airtight strips are prone to deformation due to long-term compression, and uneven ground can lead to unstable airtightness. Furthermore, frequent door opening and closing accelerates the wear and tear of the airtight strips, increasing maintenance and replacement costs. Moreover, this design structure easily leads to dust accumulation, increasing cleaning difficulty and further affecting the maintenance of the cleanroom. Another existing technology involves adding a fixed threshold at the bottom to improve airtight stability, but this design negatively impacts ease of passage, especially increasing operational difficulty and reducing work efficiency when transporting medical equipment in and out. Further technological improvements include using an automatically descending sealing strip to reduce long-term friction with the ground, and using pneumatic sealing pipes to address the problem of low airtight stability caused by uneven ground. However, automatic descending airtight strips require a high degree of ground flatness, and their operation relies on a mechanical structure, making them prone to accumulating dust and dirt, affecting operational stability. Airtight sealing systems, due to their relatively complex structure, require an additional air pressure control system to maintain the sealing effect, resulting in higher installation costs and maintenance requirements. Furthermore, this system consumes air quickly and is susceptible to changes in ambient temperature and humidity, increasing the instability of its sealing performance. [Summary of the Invention]

[0004] In view of the above, the present invention provides an airtight door assembly, comprising a first side door frame and a second side door frame; a threshold, detachably disposed between the first side door frame and the second side door frame, the threshold having an upper surface and a first end; a first snap-fit ​​structure disposed at the first end for securing the threshold to the first side door frame; and an airtight threshold strip disposed on the upper surface of the threshold and covering the first snap-fit ​​structure.

[0005] The airtight door assembly further includes a second snap-fit ​​structure, the threshold has a second end, the second snap-fit ​​structure is disposed on the upper surface of the second end for securing the threshold to the second side door frame, the first snap-fit ​​structure is disposed on the upper surface of the first end for securing the threshold to the first side door frame, and the threshold airtight strip is disposed on the upper surface of the threshold and covers the first snap-fit ​​structure and the second snap-fit ​​structure.

[0006] Wherein, the upper surface of the threshold has a groove for accommodating the threshold airtight strip, the groove has a first side groove surface, the first snap-fit ​​structure is disposed on the first side groove surface for securing the threshold to the first side door frame, and the threshold airtight strip covers the first snap-fit ​​structure.

[0007] The airtight door assembly further includes a second snap-fit ​​structure, the groove has a second side groove surface, the second snap-fit ​​structure is disposed on the second side groove surface, and is used to fasten the threshold to the second side door frame, and the threshold airtight strip covers the first snap-fit ​​structure and the second snap-fit ​​structure.

[0008] The threshold airtight strip has a first end airtight strip and a second end airtight strip. The first end airtight strip and the second end airtight strip are foldably accommodated in the groove and are used to cover the first buckle structure and the second buckle structure, respectively.

[0009] The threshold airtight strip has a main airtight strip, and the groove has a first side groove, a main groove and a second side groove, for respectively accommodating the first end airtight strip, the main airtight strip and the second end airtight strip.

[0010] Wherein, the cross-sectional area of ​​the groove is semi-circular, the cross-sectional area of ​​the main groove is semi-circular with an arc angle greater than 180°, the cross-sectional areas of the first side groove and the second side groove are semi-circular with an arc angle less than or equal to 180°, and the cross-sectional area of ​​the threshold airtight strip is a circle that matches the cross-sectional area of ​​the groove.

[0011] The airtight door assembly further includes a first airtight strip and a second airtight strip, which are respectively disposed on the first side door frame and the second side door frame. The threshold airtight strip has a first end airtight strip and a second end airtight strip, and both the first airtight strip and the second airtight strip have an airtight strip hole for accommodating the first end airtight strip and the second end airtight strip respectively.

[0012] The airtight door assembly further includes a third airtight strip, wherein the threshold has a first side surface, and the third airtight strip is disposed on the first side surface of the threshold.

[0013] The first buckle structure has a buckle upper surface, which is coplanar with the upper surface of the threshold, and the first buckle structure also has a telescopic element for engaging the first side door frame.

[0014] In summary, the present invention provides an airtight door assembly comprising a threshold, an airtight strip disposed on the threshold, and a snap-fit ​​structure. The detachable threshold of the present invention ensures airtight stability while reducing obstruction during equipment handling. Furthermore, the present invention features airtight strip holes on the first and second airtight strips on the first and second side door frames, respectively, to accommodate the first and second ends of the threshold airtight strip. Simultaneously, a third airtight strip is disposed on the first side surface of the threshold to further enhance the airtight performance between the door frame edge and the threshold. Moreover, the snap-fit ​​structure of the present invention employs a concealed design to effectively prevent the accumulation of dust and dirt. Due to its simple structure and lack of obvious grooves and gaps, it not only facilitates surface smoothness but also makes cleaning and daily maintenance easy. Overall, the structural design of the airtight door assembly provided by the present invention is particularly suitable for environments requiring high cleanliness, such as cleanrooms, operating rooms, and biosafety laboratories. In addition, this structure is also suitable for cell preparation plants requiring fumigation disinfection, further enhancing its versatility and practicality.

[0015] During fumigation, the disinfectant fills the entire space in gaseous form. To prevent potential harm to the surrounding environment and personnel from gas infiltration, and to avoid external air entering and affecting the disinfection results, the traditional method is to manually cover the door seams with adhesive strips to achieve complete airtightness during fumigation. However, this method has significant drawbacks, including low operational efficiency, cumbersome process, and high dependence on the operator's skill and precision. The airtight door assembly provided by this invention overcomes the above problems by improving overall airtightness. It not only meets the requirements of a sterile production environment and effectively reduces the risk of contaminant infiltration, but also further optimizes the smoothness of equipment entry and exit, improving the operational efficiency of equipment handling. Furthermore, this invention can further increase the efficiency and safety of fumigation to ensure the continuity and reliability of the production process, thereby meeting the FDA's environmental control standards for cleanrooms. In addition, its structural design takes into account both operational convenience and performance stability, meeting the dual requirements of efficient operation in a clean environment. [Simplified Explanation of the Diagram]

[0032] Figure 1 is a top view schematic diagram showing the airtight door assembly of the present invention in the separated state.

[0033] Figure 2 is a top view schematic diagram showing the assembled state of the airtight door assembly of the present invention.

[0034] Figure 3 is a top view of a threshold according to a specific embodiment of the present invention.

[0035] Figure 4 is a cross-sectional schematic diagram illustrating the threshold line cc' of the present invention.

[0036] Figure 5 is a cross-sectional schematic diagram of the threshold line of the present invention.

[0037] Figure 6 is a cross-sectional schematic diagram illustrating the threshold line ee' of the present invention.

[0038] Figure 7 is a side view of the threshold of a specific embodiment provided by the present invention.

[0039] Figure 8 is a side view of the threshold fixing of an embodiment provided by the present invention.

[0040] Figure 9 is a schematic diagram showing the airtight structure separation state of the airtight door assembly of the present invention.

[0041] Figure 10 is a schematic diagram showing the airtight structure assembly state of the airtight door assembly of the present invention.

[0042] Figure 11 is a schematic diagram of a threshold according to another embodiment of the present invention.

[0043] Figure 12 is a schematic cross-sectional view of the threshold along the line ff' of another embodiment provided by the present invention.

[0044] Figure 13 is a schematic cross-sectional view of the threshold along the line gg' of another embodiment provided by the present invention.

Implementation Method

[0016] To make the advantages, spirit, and features of the present invention easier and clearer to understand, detailed descriptions and discussions will follow with reference to the accompanying drawings and specific embodiments. It should be noted that these specific embodiments are merely representative examples of the present invention, and the specific methods, apparatus, conditions, materials, etc., exemplified are not intended to limit the present invention or the corresponding specific embodiments. Furthermore, the elements in the figures are only used to express their relative positions and are not drawn to scale; the step numbers in the present invention are only for distinguishing different steps and do not represent the order of the steps, as will be stated previously.

[0017] Please refer to Figures 1 and 2. Figure 1 is a top view showing the airtight door assembly of the present invention in a separated state. Figure 2 is a top view showing the airtight door assembly of the present invention in an assembled state. The present invention provides an airtight door assembly, comprising a first side door frame 22, a second side door frame 23, a threshold 1, a door body 2, a first snap-fit ​​structure 191, a threshold airtight strip 10, and a third airtight strip 14. The threshold 1 is detachably disposed between the first side door frame 22 and the second side door frame 23. The threshold has a first end A of an upper surface 18 and a first side surface 61. The first snap-fit ​​structure 191 is disposed at the first end A to secure the threshold 1 to the first side door frame 22. The threshold airtight strip 10 is disposed on the upper surface 18 of the threshold 1 and covers the first snap-fit ​​structure 191. The threshold also has a first side surface 61, and the third airtight strip 14 is disposed on the first side surface 61 of the threshold 1. In another specific embodiment, the airtight door assembly of the present invention further includes a second snap-fit ​​structure 193, which is disposed on the upper surface 18 of the second end B of the threshold 1 to secure the threshold 1 to the second side door frame 23. A first snap-fit ​​structure 191 is disposed on the upper surface 18 of the first end A to secure the threshold 1 to the first side door frame 22. An airtight threshold strip 10 is disposed on the upper surface 18 of the threshold 1 and covers the first snap-fit ​​structure 191 and the second snap-fit ​​structure 193. The airtight threshold strip 10 has a main airtight strip 11, a first end airtight strip 12, and a second end airtight strip 13. The airtight door assembly further includes a door leaf 21, a hinge 26, a first airtight strip 24, and a second airtight strip 25, which are respectively disposed on the first side door frame 22 and the second side door frame 23. The threshold is fitted horizontally between the two door frames (X-shaped), but in practice, it is not limited to this; the threshold can be fitted horizontally or vertically between the two door frames. The threshold 1 can be made of at least one of the following: stainless steel, metal plate, iron plate, aluminum plate, acrylic, plastic, 3D printing material, and wood. The first airtight strip 24, the second airtight strip 25, the threshold airtight strip 10, and the third airtight strip 14 can be made of one of the following: ethylene propylene diene monomer rubber (EPDM), silicone, fluororubber (Viton), polyurethane (PU), and neoprene rubber (CR). However, in practice, the materials of the threshold and the aforementioned airtight strips are not limited to these; they can be designed or selected according to user needs.

[0018] Please refer to Figures 3, 4, and 5. Figure 3 is a top view of a threshold according to a specific embodiment of the present invention. Figure 4 is a cross-sectional view of the threshold along the cc' line of the present invention. Figure 5 is a cross-sectional view of the threshold along the dd' line of the present invention. As shown in Figures 3 and 4, the upper surface 18 of the threshold 1 has a groove 3 for accommodating the threshold airtight strip 10. The threshold airtight strip 10 has a main airtight strip 111, and the groove further has a first side groove 32, a main side groove 33, and a second side groove 34 for accommodating the first end airtight strip 121, the main airtight strip 111, and the second end airtight strip 131, respectively. The threshold airtight strip 10 can cover the first snap-fit ​​structure 1911 and the second snap-fit ​​structure 1931. The first side groove 32 has a first side groove surface 35, and a first snap-fit ​​structure 1911 is disposed on the first side groove surface 35 to secure the threshold 1 to the first side door frame 22. The threshold airtight strip 10 can cover the first snap-fit ​​structure 191. This design achieves comprehensive shielding, reducing the possibility of dust, dirt, and other foreign matter accumulation, while improving cleanliness and ease of maintenance, ensuring the stability and service life of the threshold during long-term use. Furthermore, as shown in FIG. 5, the airtight door assembly of the present invention may also include a second snap-fit ​​structure 1931. The groove 3 further has a second side groove surface 36, and the second snap-fit ​​structure 1931 is disposed on the second side groove surface 36 to secure the threshold 1 to the second side door frame 23.

[0019] The cross-sectional area of ​​the groove in this invention can be semi-circular, as shown in Figure 4. In this specific embodiment, the first side groove 32 has a first side groove surface 35, and the first snap-fit ​​structure 1911 is disposed on the first side groove surface 35, and the first snap-fit ​​structure 1911 and the first side groove surface 35 are coplanar. The cross-sectional area of ​​the first side groove 32 is a semi-circular shape with an arc angle less than or equal to 180°, and the cross-sectional area of ​​the threshold airtight strip 10 is a circle that matches the cross-sectional area of ​​the first side groove 32. The geometric characteristics of this invention enable the first end airtight strip 12 to cover the first snap-fit ​​structure 1911 after installation, and the first end airtight strip 12 can be easily lifted to facilitate the operation of the opening and closing function of the first snap-fit ​​structure 1911, thereby maintaining the stability of the structure and further enhancing the flexibility of the door assembly of this invention.

[0020] In another specific embodiment, the cross-sectional area of ​​both the first side groove and the second side groove can be a semicircle with an arc angle less than or equal to 180°. Both the first end airtight strip and the second end airtight strip can be hinged and accommodated in the groove, respectively covering the first snap-fit ​​structure and the second snap-fit ​​structure. As shown in FIG5, the second side groove 34 has a second side groove surface 36, and the second snap-fit ​​structure 1931 is disposed on the second side groove surface 36, and the second snap-fit ​​structure 1931 is coplanar with the second side groove surface 36. The cross-sectional area of ​​the second side groove 34 is a semicircle with an arc angle less than or equal to 180°, and the cross-sectional area of ​​the threshold airtight strip 10 is a circle matching the cross-sectional area of ​​the second side groove 34.

[0021] Please refer to Figure 6. Figure 6 is a cross-sectional schematic diagram of the threshold along the line ee' of the present invention. The cross-sectional area of ​​the groove of the present invention can be semi-circular. As shown in Figure 6, in this specific embodiment, the cross-sectional area of ​​the main groove 33 is a semi-circular shape with an arc angle greater than 180°. By virtue of this geometric characteristic, the main airtight strip 11 can be stably fixed in the main groove 33 after being embedded, and it is not easy to loosen or detach due to external force. Among them, the cross-sectional area of ​​the threshold airtight strip 10 is a circle that matches the cross-sectional area of ​​the main groove 33. However, in practice, it is not limited to this. The cross-sectional area of ​​the groove can include various shapes such as semi-circular, square, circular, and elliptical. This groove design of the threshold not only ensures the airtightness of the entire door assembly, but also reduces maintenance needs and installation complexity, further improving the service life and reliability of the product.

[0022] Please refer to Figures 7 and 8. Figure 7 is a side view of a threshold according to a specific embodiment of the present invention. Figure 8 is a side view of a threshold fixing according to an embodiment of the present invention. As shown in Figure 7, the first snap-fit ​​structure 1911 further includes a telescopic element 192 for snapping into the first side door frame 22. A third airtight strip 14 is disposed on the first side surface 61 of the threshold 1 to further improve the airtightness of the overall structure. The third airtight strip can be an integrally formed airtight strip or composed of multiple airtight strips. As shown in Figure 8, when the first snap-fit ​​structure 191 is opened, the telescopic element 192 protrudes from the first side surface 61 of the threshold 1 to fix the threshold 1 to the first side door frame 22. The threshold 1 is tightly fixed to both side door frames to reduce the possibility of misalignment of the airtight strip caused by human movement. When the first snap-fit ​​structure 191 is closed, the threshold 1 can be easily disassembled to reduce obstacles to equipment handling. In other specific embodiments, the threshold may also include a second snap-fit ​​structure to fix the threshold to both the first and second side door frames.

[0023] Please refer to Figures 9 and 10. Figure 9 is a schematic diagram showing the airtight structure of the airtight door assembly of the present invention in a separated state. Figure 10 is a schematic diagram showing the airtight structure of the airtight door assembly of the present invention in an assembled state. As shown in Figures 9 and 10, the first side door frame 22 is provided with a first airtight strip 24, which has an airtight strip hole 27 for accommodating the first end airtight strip 121. The diameter of the airtight strip hole 27 is greater than or equal to that of the first end airtight strip 121. When the threshold 1 is engaged with the first side door frame 22 in the horizontal direction X, the first latch 1911 is opened. The first latch 1911 drives the telescopic element 192, causing the telescopic element 192 to protrude from the first side surface 61 of the threshold 1 and match and engage with the recess 28 of the first side door frame 22 to fix the threshold 1 in the first side door frame 22.

[0024] In the prior art, the joints of the side and bottom airtight strips of the airtight door assembly cannot achieve a completely tight fit due to imperfect design or installation, resulting in the existence of minute gaps. These gaps provide channels for the penetration of airflow, dust, and moisture, thereby significantly reducing the airtightness of the overall structure. The present invention completely solves this problem through the above-mentioned improved structural design. By optimizing the shape and joint method of the airtight strips, a precise joint between the side and bottom airtight strips is effectively achieved. The present invention not only completely eliminates minute gaps and ensures the long-term stability of the airtight strip joints, but also improves the overall airtightness of the airtight door assembly.

[0025] In other specific embodiments, the threshold airtight strip may further have a first end airtight strip and a second end airtight strip. Both the first and second airtight strips have an airtight strip hole for respectively accommodating the first end airtight strip and the second end airtight strip. The diameter of the airtight strip hole is greater than or equal to the diameter of the first end airtight strip and the second end airtight strip.

[0026] Please refer to Figures 11, 12, and 13. Figure 11 is a schematic diagram of a threshold according to another embodiment of the present invention. Figure 12 is a schematic cross-sectional view of a threshold along the line ff' according to another embodiment of the present invention. Figure 13 is a schematic cross-sectional view of a threshold along the line gg' according to another embodiment of the present invention. As shown in Figures 11 and 12, the threshold airtight strip 10' has a main airtight strip 112, a first end airtight strip 122, and a second end airtight strip 132. In this specific embodiment, the first end airtight strip 122 and the second end airtight strip 132 are hinged and cover the upper surface 18 of the threshold 1, respectively, and are used to cover the first snap-fit ​​structure 1912 and the second snap-fit ​​structure 1932. The first snap-fit ​​structure 1912 has a snap-fit ​​upper surface 5, which is coplanar with the upper surface 18 of the threshold 1. The first end airtight strip 122 covers the snap-fit ​​upper surface 5, and the first snap-fit ​​structure 1912 also has a telescopic element 192 for snapping into the first side door frame 22. As shown in FIG13, the main airtight strip 112 includes an adhesive layer 8 for adhering to the upper surface 18 of the threshold. This invention utilizes the design differences between the main airtight strip 112 and the first and second end airtight strips 122 and 132 to securely fix the airtight strip to the upper surface 18 of the threshold 1. Furthermore, it allows the first and second end airtight strips 122 and 132 to be lifted after installation and effectively cover the first and second snap-fit ​​structures 1912 and 1932. This structure not only improves the overall sealing effect but also effectively prevents the problem of hidden dirt and dust common in traditional designs.

[0027] In practice, the airtight door assembly provided by the present invention is not limited to installation in clean airtight doors, but can also be installed in other suitable scenarios, and also has sound insulation effect in other scenarios.

[0028] In summary, the present invention provides an airtight door assembly comprising a threshold, an airtight strip disposed on the threshold, and a snap-fit ​​structure. The detachable threshold of the present invention ensures airtight stability while reducing obstruction during equipment handling. Furthermore, the present invention features airtight strip holes on the first and second airtight strips on the first and second side door frames, respectively, to accommodate the first and second ends of the threshold airtight strip. Simultaneously, a third airtight strip is disposed on the first side surface of the threshold to further enhance the airtight performance between the door frame edge and the threshold. Moreover, the snap-fit ​​structure of the present invention employs a concealed design to effectively prevent the accumulation of dust and dirt. Due to its simple structure and lack of obvious grooves and gaps, it not only facilitates surface smoothness but also makes cleaning and daily maintenance easy. Overall, the structural design of the airtight door assembly provided by the present invention is particularly suitable for environments requiring high cleanliness, such as cleanrooms, operating rooms, and biosafety laboratories. In addition, this structure is also suitable for cell preparation plants requiring fumigation disinfection, further enhancing its versatility and practicality.

[0029] During fumigation, the disinfectant fills the entire space in gaseous form. To prevent potential harm to the surrounding environment and personnel from gas infiltration, and to avoid external air entering and affecting the disinfection results, the traditional method is to manually cover the door seams with adhesive strips to achieve complete airtightness during fumigation. However, this method has significant drawbacks, including low operational efficiency, cumbersome process, and high dependence on the operator's skill and precision. The airtight door assembly provided by this invention overcomes the above problems by improving overall airtightness. It not only meets the requirements of a sterile production environment and effectively reduces the risk of contaminant infiltration, but also further optimizes the smoothness of equipment entry and exit, improving the operational efficiency of equipment handling. Furthermore, this invention can further increase the efficiency and safety of fumigation to ensure the continuity and reliability of the production process, thereby meeting the FDA's environmental control standards for cleanrooms. In addition, its structural design takes into account both operational convenience and performance stability, meeting the dual requirements of efficient operation in a clean environment.

[0030] It should be noted that relational terms in this document, such as “first” and “second”, are used only to distinguish an entity or operation from another entity or operation, without requiring or implying any actual relationship or order between these entities or operations. Furthermore, the words “including,” “having,” and “containing,” as well as other similar forms, are intended to be equivalent in meaning and are open-ended; one or more items following any of these words do not imply an exhaustive list of such one or more items, or that the list is limited to one or more items.

[0031] The detailed description of the preferred embodiments above is intended to more clearly describe the features and spirit of the present invention, and is not intended to limit the scope of the present invention by the preferred embodiments disclosed above. Rather, the aim is to cover various changes and equivalent arrangements within the scope of the patent claims of the present invention. Therefore, the scope of the patent claims of the present invention should be interpreted in the broadest possible sense based on the foregoing description, so as to cover all possible changes and equivalent arrangements.

Claims

1. An airtight door assembly, comprising: a first side door frame and a second side door frame; a threshold detachably disposed between the first side door frame and the second side door frame, the threshold having an upper surface, a first end, and a groove located on the upper surface; a first snap-fit ​​structure disposed at the first end for securing the threshold to the first side door frame; and an airtight threshold strip disposed on the upper surface of the threshold and covering the first snap-fit ​​structure; wherein, The groove is used to accommodate the threshold airtight strip. The groove has a first side groove surface. The first snap-fit ​​structure is provided on the first side groove surface to secure the threshold to the first side door frame.

2. The airtight door assembly as described in claim 1 further includes a second snap-fit ​​structure, the threshold having a second end, the second snap-fit ​​structure being disposed on the upper surface of the second end for securing the threshold to the second side door frame, the first snap-fit ​​structure being disposed on the upper surface of the first end for securing the threshold to the first side door frame, and the threshold airtight strip being disposed on the upper surface of the threshold and covering the first snap-fit ​​structure and the second snap-fit ​​structure.

3. The airtight door assembly as described in claim 1 further includes a second snap-fit ​​structure, the groove having a second side groove surface, the second snap-fit ​​structure being disposed on the second side groove surface for securing the threshold to the second side door frame, and the threshold airtight strip covering the first snap-fit ​​structure and the second snap-fit ​​structure.

4. The airtight door assembly as described in claim 3, wherein the threshold airtight strip has a first end airtight strip and a second end airtight strip, the first end airtight strip and the second end airtight strip are hingedly accommodated in the groove and are respectively used to cover the first snap-fit ​​structure and the second snap-fit ​​structure.

5. The airtight door assembly as described in claim 4, wherein the threshold airtight strip has a main airtight strip, and the groove further has a first side groove, a main groove and a second side groove, for respectively accommodating the first end airtight strip, the main airtight strip and the second end airtight strip.

6. The airtight door assembly as described in claim 5, wherein the cross-sectional area of ​​the groove is semi-circular, the cross-sectional area of ​​the main groove is semi-circular with an arc angle greater than 180°, the cross-sectional areas of the first side groove and the second side groove are semi-circular with an arc angle less than or equal to 180°, and the cross-sectional area of ​​the threshold airtight strip is a circle matching the cross-sectional area of ​​the groove.

7. The airtight door assembly as described in claim 1 further includes a first airtight strip and a second airtight strip, respectively disposed on the first side door frame and the second side door frame. The threshold airtight strip has a first end airtight strip and a second end airtight strip, and both the first airtight strip and the second airtight strip have an airtight strip hole for respectively accommodating the first end airtight strip and the second end airtight strip.

8. The airtight door assembly as described in claim 1 further includes a third airtight strip, wherein the threshold further has a first side surface, and the third airtight strip is disposed on the first side surface of the threshold.

9. The airtight door assembly as described in claim 1, wherein the first snap-fit ​​structure has a snap-fit ​​upper surface, the snap-fit ​​upper surface is coplanar with the upper surface of the threshold, and the first snap-fit ​​structure further has a telescopic element for snapping into the first side door frame.

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