Fire door with swing end support structure
By installing conical support wheels and expansion sealing strips on the lower side wall of the fire door, the sealing problem caused by the gap between the fire door and the ground is solved, achieving better sealing and fireproof performance, and ensuring smooth opening and closing of the door.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG SHUNDE ZHENXIONG FIRE EQUIP CO LTD
- Filing Date
- 2025-09-09
- Publication Date
- 2026-08-04
AI Technical Summary
Existing fire doors have a large gap between the door leaf and the ground, which affects the sealing performance. Furthermore, the swing end of the door leaf is prone to scraping the ground, resulting in difficulty in opening and closing and poor fire resistance.
A conical support wheel is installed on the lower side wall of the door leaf. The lower end of the conical support wheel is located in the clearance hole. The outer diameter of the end near the hinge is smaller than that of the end away from the hinge. It is used to roll on the ground, support the door leaf and reduce contact with the ground. Combined with the expansion sealing strip, it improves the sealing performance.
It improves the sealing and fire resistance of fire doors, reduces smoke leakage, facilitates personnel passage, and reduces the possibility of door panels scraping against the ground.
Smart Images
Figure CN224592043U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of fire doors, specifically to a fire door with a swing end support structure. Background Technology
[0002] Currently, fire doors have fire-resistant expansion sealing strips affixed to the sides of the door leaf. These strips expand when exposed to high temperatures or open flames, sealing the gap between the door leaf and the frame, thus providing insulation and blocking smoke. In some locations, fire doors lack a bottom frame for ease of access, resulting in a flat floor at the doorway. However, when the fire door is closed, a significant gap inevitably exists between the bottom of the door leaf and the ground, affecting its airtightness. Smoke can easily pass through this gap. If this gap were smaller, the door frame, hinges, and door leaf would inevitably undergo plastic deformation over time, causing the swing end of the door leaf (the end furthest from the hinge) to sag. This swing end would scrape the ground, potentially causing damage and hindering the opening and closing of the fire door. Therefore, existing fire door technology needs improvement. Summary of the Invention
[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a fire door with a swing end support structure, which has a better fire protection effect and facilitates personnel passage.
[0004] The objective of this utility model is achieved through the following technical solution.
[0005] The fire door with a swing end support structure disclosed in this utility model includes a door frame, a door leaf, and a hinge. One end of the door frame and the door leaf are hinged together by the hinge. The lower end of the door frame is provided with a lower opening. The door leaf is provided with expansion sealing strips around its perimeter. The door leaf forms a lower side wall with a clearance hole. The corresponding other end of the door leaf is provided with a conical support wheel for rolling on the ground. The lower end of the conical support wheel is located in the clearance hole. The outer diameter of the end of the conical support wheel closer to the hinge is smaller than the outer diameter of the end of the conical support wheel farther from the hinge.
[0006] Preferably, a bracket is provided on the lower side wall of the door leaf, and the two ends of the conical support wheel are respectively formed with a rotating shaft, which is rotatably connected to the corresponding bracket.
[0007] Preferably, the door leaf is equipped with heat insulation cotton.
[0008] Preferably, the door leaf is provided with a cover, which is placed on the conical support wheel, and the heat insulation cotton is placed on the outside of the cover.
[0009] Preferably, the width of the clearance hole is smaller than the outer diameter of the conical support wheel relative to the end closest to the hinge.
[0010] Compared with the prior art, the advantages of this utility model are as follows: by setting a lower opening at the bottom of the door frame, providing expansion sealing strips around the door leaf, forming a lower side wall of the door leaf with a clearance hole, and providing a conical support wheel for rolling on the ground at the corresponding other end of the door leaf, with the lower end of the conical support wheel located in the clearance hole, and the outer diameter of the end of the conical support wheel closer to the hinge being smaller than the outer diameter of the end of the conical support wheel farther from the hinge, the fire door of this utility model has a better fire resistance effect and also makes it easier for people to pass through. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the front view structure of the fire door of this utility model.
[0012] Figure 2 for Figure 1 A schematic diagram of the partial structure in AA section view.
[0013] Figure 3 for Figure 1 A schematic diagram of the partial structure at point B.
[0014] Figure 4 This is a front view structural diagram of the door frame of this utility model.
[0015] Figure 5 This is a partial cross-sectional view of the fire door of this utility model from the front view.
[0016] Labeling descriptions: Door frame 1; bottom opening 101; door leaf 2; bottom side wall of door leaf 201; clearance hole 2011; conical support wheel 21; pivot 2101; expansion sealing strip 22; bracket 23; cover 24; thermal insulation cotton 25; hinge 3; floor 99. Detailed Implementation
[0017] The present invention will now be further described with reference to the accompanying drawings.
[0018] The fire door of this utility model with a swing end support structure, such as Figure 1 As shown, the door includes a door frame 1, a door leaf 2, and a hinge 3. The door frame 1 and one end of the door leaf 2 are hinged together by the hinge 3. The hinge 3 includes a hinge axis, the axis of which is along the vertical direction. Therefore, the door leaf 2 can swing horizontally around the hinge axis. The door leaf 2 is located inside the door frame 1 (when the door leaf 2 is closed). Figure 4As shown, the lower end of the door frame 1 has a bottom opening 101, meaning that the lower end of the door frame 1 is not sealed. In other words, the door frame 1 includes a left frame strip, a right frame strip, and a top frame strip. This allows the top frame strip to be flush with the ground 99 below, preventing people from kicking the protruding structure when entering or exiting the door frame 1 (with the door leaf 2 in the open state), thus facilitating passage through the fire door. Figure 2 , Figure 3 and Figure 5 As shown, expansion sealing strips 22 are provided around the four sides of the door leaf 2. That is, when the door leaf 2 is in the closed state, there is a corresponding expansion sealing strip 22 between the left frame strip and the left side of the door leaf 2, a corresponding expansion sealing strip 22 between the right frame strip and the right side of the door leaf 2, a corresponding expansion sealing strip 22 between the top frame strip and the top side of the door leaf 2, and a corresponding expansion sealing strip 22 between the bottom side of the door leaf 2 and the ground 99. The door leaf 2 forms a lower side wall 201, so the bottom side of the door leaf 2 is the bottom of the lower side wall 201, and the expansion sealing strips 22 can adhere to the bottom of the lower side wall 201. Figure 2 and Figure 5 As shown, a clearance hole 2011 is formed in the lower side wall 201 of the door leaf. A conical support wheel 21 for rolling on the ground 99 is provided at the corresponding other end of the door leaf 2. That is, the conical support wheel 21 is located at the swing end of the door leaf 2, and its lower end is located within the clearance hole 2011. The outer diameter of the end of the conical support wheel 21 closest to the hinge 3 is smaller than the outer diameter of the end of the conical support wheel 21 furthest from the hinge 3. Since the conical support wheel 21 is used to roll on the ground 99, its axis is inclined. Figure 1 For example, the right end of the door leaf 2 is hinged to the door frame 1, and the conical support wheel 21 is located at the lower left end of the door leaf 2. When the door leaf 2 is closed, the axis of the conical support wheel 21 is inclined with the left side higher than the right side, so that the lower generatrix of the conical shape of the conical support wheel 21 is in parallel contact with the ground 99. Correspondingly, the outer diameter of the left end of the conical support wheel 21 is larger than the outer diameter of the right end of the conical support wheel 21. From a top-down angle, the axis of the conical support wheel 21 roughly points to the axis of the hinge axis of the hinge 3.
[0019] like Figure 1 and Figure 3As shown, since the conical support wheel 21 contacts the ground 99, the left end of the door leaf 2 receives direct support from the ground 99, preventing the door leaf 2 from being a cantilever structure. This reduces deformation of the door frame 1 and the door leaf 2, and prevents the lower left end of the door leaf 2 from scraping against the ground 99. When the door leaf 2 swings horizontally to open and close, the conical support wheel 21 rolls on the ground 99 because the door leaf 2 swings around the hinge axis of the hinge 3. Since the outer diameter of the left end of the conical support wheel 21 is larger than the outer diameter of the right end, the relative movement distance between the left end of the conical support wheel 21 and the ground 99 is larger, while the relative movement distance between the right end of the conical support wheel 21 and the ground 99 is smaller. Because the swing radius of the right end of the conical support wheel 21 around the hinge axis of the hinge 3 is smaller, the local slippage and scraping of the conical support wheel 21 against the ground 99 is reduced, thus reducing the occurrence of scratches on the ground 99. By setting the conical support wheel 21, as... Figure 5 As shown, the lower end of the door leaf 2 can be set close to the ground 99. As mentioned above, an expansion sealing strip 22 is also provided between the lower side of the door leaf 2 and the ground 99, so that the expansion sealing strip 22 at the lower end of the door leaf 2 can be set close to the ground 99. For example, the gap between the expansion sealing strip 22 and the ground 99 is about 0.5 to 0.8 mm. Due to the supporting effect of the conical support wheel 21, the expansion sealing strip 22 can avoid scraping the ground 99. When a fire occurs, the expansion sealing strip 22 expands and easily seals the gap between the ground 99 and the lower side wall 201 of the door leaf, reducing the leakage of smoke and flames. Therefore, the fireproof effect of this utility model is also good.
[0020] Furthermore, such as Figure 5 As shown, a bracket 23 is provided on the lower side wall 201 of the door leaf (it should be noted that only...). Figure 5 The bracket 23 is schematically shown. The two ends of the conical support wheel 21 are respectively formed with rotating shafts 2101. The rotating shafts 2101 are rotatably connected to the corresponding brackets 23. So when the fire door is closed, the rotating shafts 2101 are tilted with the left side higher than the right side. The rotating shafts 2101 can fit through the corresponding brackets 23. The rotating shafts 2101 have shoulders that abut against the corresponding brackets 23. The lower end of the brackets 23 can be welded to the upper side of the lower side wall 201 of the door leaf. The rotating support structure of the conical support wheel 21 is relatively simple and easy to manufacture.
[0021] Furthermore, such as Figure 5 As shown, the door leaf 2 is equipped with heat insulation cotton 25, which can be aluminum silicate cotton or rock wool, thus improving the heat insulation effect of the door leaf 2.
[0022] Furthermore, such as Figure 5 As shown, a cover 24 is provided inside the door leaf 2 (it should be noted that only...) Figure 5The cover 24 is schematically shown. The cover 24 is placed on the conical support wheel 21. The heat insulation cotton 25 is placed on the outside of the cover 24. The cover 24 can be welded to the bracket 23. Thus, the cover 24 separates the heat insulation cotton 25 from the conical support wheel 21, which can prevent the conical support wheel 21 from pulling the heat insulation cotton 25 to the clearance hole 2011.
[0023] Furthermore, such as Figure 2 As shown, the width of the clearance hole 2011 is smaller than the outer diameter of the conical support wheel 21 at the end closest to the hinge 3 (that is, the outer diameter of the right end of the conical support wheel 21). The width of the clearance hole 2011 is... Figure 2 The dimension “W” in the diagram is such that the conical support wheel 21 is in near-line contact with the ground 99. Therefore, even if the width of the clearance hole 2011 is set to be small, it is not easy for the edge of the clearance hole 2011 to interfere with the conical support wheel 21. The width of the clearance hole 2011 is set to be small to prevent debris from easily entering the door leaf 2 through the clearance hole 21, and to prevent debris from easily affecting the rotation of the conical support wheel 21.
Claims
1. A fire door with a swing end support structure, comprising a door frame (1), a door leaf (2) and a hinge (3), the door frame (1) and one end of the door leaf (2) being hingedly connected by the hinge (3), characterized in that: The lower end of the door frame (1) is provided with a lower opening (101), the periphery of the door leaf (2) is respectively provided with an expansion sealing strip (22), the door leaf (2) is formed with a door leaf lower side wall (201), the door leaf lower side wall (201) is formed with an avoiding hole (2011), the other end of the door leaf (2) is internally provided with a conical supporting wheel (21) for rolling on the ground (99), the lower end of the conical supporting wheel (21) is arranged in the avoiding hole (2011), and the outer diameter of one end of the conical supporting wheel (21) relatively close to the hinge (3) is smaller than the outer diameter of the other end of the conical supporting wheel (21) relatively far away from the hinge (3).
2. The fire door having a swing end support structure according to claim 1, wherein: A support (23) is arranged on the door leaf lower side wall (201), both ends of the conical supporting wheel (21) are respectively formed with a rotating shaft (2101), and the rotating shaft (2101) is rotationally connected to the corresponding support (23).
3. The fire door with a swing end support structure according to claim 2, wherein: The door leaf (2) is internally provided with heat insulation cotton (25).
4. The fire door with a swing end support structure according to claim 3, wherein: The door leaf (2) is internally provided with a cover (24), the cover (24) is arranged on the conical supporting wheel (21), and the heat insulation cotton (25) is arranged on the outer side of the cover (24).
5. The fire door with a swing end support structure according to claim 1, wherein: The width of the avoiding hole (2011) is smaller than the outer diameter of one end of the conical supporting wheel (21) relatively close to the hinge (3).