Multi-stage sealing nested bidirectional stress sealing door frame
Patent Information
- Application Number
- CN202620014335.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-07
- Publication Date
- 2026-10-23
- Estimated Expiration
- 2036-01-07
AI Technical Summary
[0004]有鉴于此，本实用新型的目的在于提出一种多级密封嵌套式双向受力密闭门框架，以解决传统结构变形补偿能力弱、双向受力密封性能差导致密封不严、泄漏点产生的问题
1.门板绕门框本体转动关闭时，其顶部首先进入上门框架内的环形安装槽区域，门板的顶部边缘向下压靠设置在环形安装槽内的径向密封圈，使径向密封圈沿径向发生弹性形变，通过在上门框架内设置环形安装槽并在槽内布置径向密封圈，使门板闭合时产生可靠的径向压紧密封，显著提高门板与门框本体之间的密封性能；从而实现该密闭门框本体具备良好的防泄漏性能与双向受力下的密封可靠性，整体结构简单、耐用且便于制造。
Smart Images
Figure CN224885470U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of load-bearing airtight door frames, and in particular to a multi-level sealed nested bidirectional load-bearing airtight door frame. Background Technology
[0002] Airtight door frames are widely used in cleanrooms, negative pressure laboratories, explosion-proof chambers, pressure testing chambers, and industrial equipment that requires maintaining a specific pressure difference or airtight environment.
[0003] Traditional airtight doors often rely on unidirectional sealing structures, such as ordinary rubber strips or simple compression gaskets inside the door frame, which are then sealed by mechanical locking when the door is closed. However, such structures mainly rely on a single axial or radial compression method. When the force direction on the door changes or there are large fluctuations in external positive or negative pressure, local leakage can easily occur at the sealing interface. In addition, existing door frames mostly use fixed sealing strip structures, which have limited deformation compensation capabilities and cannot adapt to the displacement, deformation, or gap changes that occur in the door panel due to long-term use, resulting in a decrease in sealing reliability. Meanwhile, while some existing enhanced airtight doors incorporate double or multiple sealing structures, the sealing layers are often simply stacked, with their sealing directions either consistent or independent. They fail to provide effective composite sealing in both axial and radial directions simultaneously, and lack automatic expansion or adaptive compensation functions, thus failing to meet the stable sealing requirements under bidirectional stress environments. In applications requiring positive pressure, negative pressure, or frequent pressure differential switching, such as pressure testing chambers or sealed protective enclosures, traditional structures often cannot maintain a high sealing level continuously, resulting in problems such as incomplete sealing, leakage points, and frequent maintenance and replacement. Therefore, this invention proposes a multi-stage nested, bidirectional stress-bearing airtight door frame to meet the requirements for sealing stability under positive pressure, negative pressure, or bidirectional stress conditions. Utility Model Content
[0004] In view of this, the purpose of this utility model is to propose a multi-level sealed nested bidirectional force-bearing airtight door frame to solve the problems of weak deformation compensation ability and poor bidirectional force-bearing sealing performance of traditional structures, which lead to poor sealing and leakage points.
[0005] To achieve the above objectives, this utility model provides a multi-level sealed nested bidirectional force-bearing airtight door frame, including a door frame body. The door frame body is composed of an upper door frame and a side door frame. The bottom of the side door frame is fixed to the ground. A door panel is rotatably mounted inside the door frame body, and a sealing lock is provided on the door panel. A sealing assembly is provided inside the door frame body. The sealing assembly includes an annular mounting groove disposed in the upper door frame, and a radial sealing ring is disposed in the annular mounting groove. The sealing assembly also includes an embedding groove disposed in the side door frame, and a sealing gasket is disposed in the embedding groove.
[0006] Preferably, a positioning stop is provided on one side of the annular mounting groove, the annular mounting groove is provided with a semi-circular cross section, and a groove is provided at the bottom of the annular mounting groove, so that one end of the radial sealing ring can contact the top of the door panel through the groove.
[0007] Preferably, the embedding groove is shaped like a concave "U", and one end of the sealing gasket is provided with a contact surface.
[0008] Preferably, both the radial sealing ring and the sealing gasket are pressure-resistant elastomers.
[0009] Preferably, an installation cavity is provided on one side of the door panel, and a sealing bladder is provided inside the installation cavity. The sealing bladder is L-shaped, and multiple sets of expansion slits are provided on one side surface of the sealing bladder. One side of the sealing bladder is in contact with the contact surface.
[0010] Preferably, a plurality of pressure tubes are provided on one side of the sealing bladder, and a groove adapted to the pressure tubes is provided through the door panel, and the pressure tubes can contact the inner wall of the side door frame.
[0011] The beneficial effects of this utility model are: 1. When the door panel rotates around the door frame body to close, its top first enters the annular mounting groove area in the upper door frame. The top edge of the door panel presses down against the radial sealing ring set in the annular mounting groove, causing the radial sealing ring to undergo elastic deformation in the radial direction. By setting an annular mounting groove in the upper door frame and arranging the radial sealing ring in the groove, a reliable radial compression seal is generated when the door panel is closed, which significantly improves the sealing performance between the door panel and the door frame body. Thus, the sealed door frame body has good anti-leakage performance and sealing reliability under bidirectional force. The overall structure is simple, durable and easy to manufacture.
[0012] 2. When the door panel closes around the door frame and enters the side door frame area, a U-shaped recess is set in the side door frame and a sealing gasket is placed therein. The side of the door panel first makes axial compression contact with the sealing gasket in the recess. Under pressure, the sealing gasket undergoes elastic deformation along the direction of the groove, and its contact surface forms a continuous and tight sealing interface with the side wall of the door panel. This allows a reliable axial compression seal to be formed when the door panel is closed, further enhancing the lateral sealing performance of the airtight door frame. At the same time, the radial sealing ring in the upper door frame is also pressed by the top of the door panel, causing the radial sealing ring to undergo radial deformation and provide a second sealing effect. Through the synchronous compression deformation of the radial sealing ring and the sealing gasket in different directions, the whole structure forms a multi-stage sealing structure with superimposed axial and radial forces. This ensures that the door panel is covered and compressed by the elastic structure on all four sides after closing, thereby achieving a highly efficient seal with multiple directions and multiple contact surfaces.
[0013] 3. When the door panel closes and enters the door frame body, the sealing bladder installed on the side of the door panel is pressed into the side door frame direction. The sealing bladder is embedded through the mounting cavity and automatically generates a bidirectional expansion seal after the door panel is closed, significantly enhancing the composite sealing capability of the airtight door frame in the axial and radial directions. Multiple sets of expansion joints on the surface of the sealing bladder undergo controllable stretching after being compressed. The expansion joints provide the sealing bladder with a larger elastic deformation space under pressure, enabling intelligent fitting compensation. At the same time, the pressure pipe contacts and is subjected to force with the inner wall of the side door frame during the continued pressing of the door panel, allowing the pressure to be transmitted along the pressure pipe to the internal area of the sealing bladder, causing the sealing bladder to expand secondary, thereby further enhancing the sealing effect of the sealing bladder on the contact surface. This gives the sealing bladder a self-reinforcing sealing characteristic, improving the reliability and adaptability of the overall sealing assembly, and forming a three-level sealing structure together with the aforementioned radial sealing ring and sealing gasket. This structure is simple, uses readily available materials, and is easy to assemble. Through multi-level superimposed sealing, it significantly improves the overall sealing performance and is particularly suitable for high airtightness, leak-proof, or bidirectional pressure applications. Attached Figure Description
[0014] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0015] Figure 1 This is a schematic diagram of the door panel opening of this utility model; Figure 2 This is a schematic diagram of the door panel closing according to this utility model; Figure 3 This is a partial schematic diagram of the door frame of this utility model; Figure 4 This is a partial schematic diagram of the side door frame of this utility model; Figure 5 This is a partial schematic diagram of the door panel of this utility model.
[0016] The markings in the diagram are as follows: 1. Door frame body; 101. Upper door frame; 102. Side door frame; 2. Door panel; 3. Sealing lock; 4. Annular mounting groove; 5. Positioning edge; 6. Radial sealing ring; 7. Embedded groove; 8. Sealing gasket; 9. Contact surface; 10. Mounting cavity; 11. Sealing bladder; 12. Expansion joint; 13. Pressure pipe. Detailed Implementation
[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.
[0018] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0019] like Figures 1-5 As shown, a multi-level sealed nested bidirectional force-bearing airtight door frame includes a door frame body 1, which is composed of an upper door frame 101 and a side door frame 102. The bottom of the side door frame 102 is fixed to the ground. A door panel 2 is rotatably installed inside the door frame body 1. A sealing lock 3 is installed on the door panel 2. The sealing lock 3 can fix and seal the door panel 2 during use. A sealing assembly is installed inside the door frame body 1. The sealing assembly includes an annular mounting groove 4 installed in the upper door frame 101. A radial sealing ring 6 is installed in the annular mounting groove 4. A positioning baffle 5 is provided on one side of the annular mounting groove 4. The annular mounting groove 4 is semi-circular in cross-section. A groove is opened at the bottom of the annular mounting groove 4. One end of the radial sealing ring 6 can contact the top of the door panel 2 through the groove. When the door panel 2 rotates around the door frame body 1 to close, its top first enters the annular mounting groove 4 area in the upper door frame 101. The top edge of the door panel 2 presses down against the radial sealing ring 6 set in the annular mounting groove 4, causing the radial sealing ring 6 to undergo elastic deformation in the radial direction. By setting the annular mounting groove 4 in the upper door frame 101 and arranging the radial sealing ring 6 in the groove, a reliable radial compression seal is generated when the door panel 2 is closed, which significantly improves the sealing performance between the door panel 2 and the door frame body 1. At the same time, the annular mounting groove 4 adopts a semi-circular structure and is provided with a groove, which not only provides a larger space for the elastic deformation of the sealing ring, but also improves the stability of the sealing ring 6. It also works with the positioning baffle 5 on one side to limit and retain the radial sealing ring 6, preventing displacement or detachment during repeated compression. The structure forms a stable radial sealing path after the door panel 2 is closed, so that the sealing component can achieve effective sealing under the locking and pressing action of the door panel 2. Thus, the sealed door frame body 1 has good anti-leakage performance and sealing reliability under bidirectional force. The overall structure is simple, durable and easy to manufacture.
[0020] like Figure 1 , Figure 2 and Figure 4 As shown, the sealing assembly also includes an embedded groove 7 disposed in the side door frame 102, a sealing gasket 8 disposed in the embedded groove 7, and an annular mounting groove 4 identical to that in the upper door frame 101 disposed at the bottom of the door frame body 1; the embedded groove 7 is opened in a "U" shape, and a contact surface 9 is disposed at one end of the sealing gasket 8; both the radial sealing ring 6 and the sealing gasket 8 are pressure-resistant elastomers. When the door panel 2 closes around the door frame body 1 and enters the side door frame 102 area, a U-shaped recess 7 is provided in the side door frame 102, and a sealing gasket 8 is arranged therein. The side of the door panel 2 first makes axial pressing contact with the sealing gasket 8 in the recess 7. Under pressure, the sealing gasket 8 undergoes elastic deformation along the direction inside the groove, and its contact surface 9 forms a continuous and fitting sealing interface with the side wall of the door panel 2. This allows a reliable axial pressing seal to be formed when the door panel 2 is closed, further enhancing the lateral sealing performance of the sealed door frame. At the same time, the radial sealing ring 6 in the upper door frame 101 is also pressed by the top of the door panel 2, causing the radial sealing ring 6 to undergo radial deformation and... It provides a second layer of sealing; through the synchronous compression deformation of the radial sealing ring 6 and the sealing gasket 8 in different directions, the whole structure forms a multi-stage sealing structure with axial and radial superposition, so that the door panel 2 is covered and compressed by the elastic structure on all four sides after closing, thereby achieving efficient sealing in multiple directions and multiple contact surfaces; both the radial sealing ring 6 and the sealing gasket 8 are made of pressure-resistant elastomer material, and they provide sealing in the radial and axial directions respectively, so that the sealing components form a complementary bidirectional sealing system, which improves the sealing stability of the door frame under positive pressure, negative pressure or bidirectional force conditions; the overall structure is simple, easy to process, and has a long service life, with significant sealing enhancement effect and engineering practical value.
[0021] like Figure 1 , Figure 2 and Figure 5 As shown, a mounting cavity 10 is provided on one side of the door panel 2, and a sealing bladder 11 is provided inside the mounting cavity 10. The sealing bladder 11 is L-shaped and is made of rubber and fiber fabric. The sealing bladder 11 is filled with sealing fluid, which can be gas or other liquid, such as water or oil. Multiple sets of expansion slits 12 are provided on one side surface of the sealing bladder 11, and one side of the sealing bladder 11 is in contact with the contact surface 9. Multiple sets of pressure pipes 13 are provided on one side of the sealing bladder 11, and the pressure pipes 13 are connected to the sealing bladder 11. A groove adapted to the pressure pipes 13 is provided through the door panel 2, and the pressure pipes 13 can contact the inner wall of the side door frame 102. When the door panel 2 closes and enters the door frame body 1, the sealing bladder 11 installed on the side of the door panel 2 is pressed into the side door frame 102. The sealing bladder 11 is embedded through the mounting cavity 10. After the door panel 2 is closed, it automatically generates a bidirectional expansion seal, significantly enhancing the composite sealing capability of the airtight door frame in both the axial and radial directions. The multiple sets of expansion joints 12 on the surface of the sealing bladder 11 undergo controllable stretching after being compressed. The expansion joints 12 provide the sealing bladder 11 with a larger elastic deformation space under pressure, enabling intelligent fitting compensation. At the same time, the pressure tube 13 continues to press the door panel 2 during the pressing process. The middle part contacts and is subjected to force on the inner wall of the side door frame 102, so that the pressure is transmitted along the pressure pipe 13 to the internal area of the sealing bladder 11, causing the sealing bladder 11 to expand secondaryly, thereby further enhancing the pressing effect of the sealing bladder 11 on the contact surface 9, giving the sealing bladder 11 a self-reinforcing sealing characteristic, improving the reliability and adaptability of the overall sealing assembly, and forming a three-level sealing structure together with the aforementioned radial sealing ring 6 and sealing gasket 8; this structure is simple, the materials are readily available, and the assembly is convenient. Through multi-level superimposed sealing, the overall sealing performance is significantly improved, and it is particularly suitable for high airtightness, leak-proof or bi-directional pressure-bearing applications.
[0022] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.
[0023] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A multi-stage sealed nested bidirectional force-bearing airtight door frame, comprising a door frame body (1), characterized in that, The door frame body (1) is composed of an upper door frame (101) and a side door frame (102). The bottom of the side door frame (102) is fixed to the ground. A door panel (2) is rotatably installed inside the door frame body (1). A sealing lock (3) is installed on the door panel (2). A sealing component is installed inside the door frame body (1). The sealing assembly includes an annular mounting groove (4) disposed in the upper door frame (101), and a radial sealing ring (6) disposed in the annular mounting groove (4); the sealing assembly also includes an embedding groove (7) disposed in the side door frame (102), and a sealing gasket (8) disposed in the embedding groove (7); the bottom of the door frame body (1) is provided with the same annular mounting groove (4) as the upper door frame (101).
2. The multi-stage sealed nested bidirectional force-bearing airtight door frame according to claim 1, characterized in that, A positioning stop (5) is provided on one side of the annular mounting groove (4). The annular mounting groove (4) is set with a semi-circular cross section. A groove is opened at the bottom of the annular mounting groove (4). One end of the radial sealing ring (6) can contact the top of the door panel (2) through the groove.
3. The multi-stage sealed nested bidirectional force-bearing airtight door frame according to claim 1, characterized in that, The embedding groove (7) is shaped like a concave "U" and one end of the sealing gasket (8) is provided with a contact surface (9).
4. The multi-stage sealed nested bidirectional force-bearing airtight door frame according to claim 2, characterized in that, Both the radial sealing ring (6) and the sealing gasket (8) are pressure-resistant elastomers.
5. A multi-stage sealed nested bidirectional force-bearing airtight door frame according to claim 3, characterized in that, The door panel (2) has an installation cavity (10) on one side, and a sealing bladder (11) is provided in the installation cavity (10). The sealing bladder (11) is L-shaped, and multiple expansion slits (12) are provided on one side surface of the sealing bladder (11). One side of the sealing bladder (11) is in contact with the contact surface (9).
6. A multi-stage sealed nested bidirectional force-bearing airtight door frame according to claim 5, characterized in that, Multiple pressure tubes (13) are provided on one side of the sealing bladder (11), and a groove adapted to the pressure tubes (13) is provided through the door panel (2). The pressure tubes (13) can contact the inner wall of the side door frame (102).