Fireproof door with smoke-proof structure
By incorporating high-temperature resistant sealing strips, a jacking mechanism, and expanded graphite columns into fire doors, automatic sealing of gaps during a fire is achieved, solving the problem of dense smoke entering fire doors due to gaps and improving heat resistance and smoke prevention.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG ZHONGJIAN FIRE FIGHTING TECH CO LTD
- Filing Date
- 2025-05-07
- Publication Date
- 2026-04-14
AI Technical Summary
Fire doors are prone to fire damage during fires, as gaps can allow dense smoke to enter escape routes and they are easily burned. Existing fire doors have insufficient heat resistance and smoke prevention.
A high-temperature resistant sealing strip and a jacking mechanism are installed between the fire door body and the door frame. The hot melt wire and counterweight block automatically seal at high temperatures. Combined with expanded graphite columns and interlocking frames, multiple layers of sealing are achieved to enhance the sealing effect.
It effectively reduces the leakage of smoke and dust from gaps during a fire, improves the heat resistance and smoke prevention of fire doors, and reduces fire damage.
Smart Images
Figure CN224120159U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of fire door technology, specifically a fire door with a smoke-proof structure. Background Technology
[0002] Fire doors are doors that meet the requirements of fire resistance stability, integrity, and heat insulation for a certain period of time. They are fire-resistant partitions with a certain degree of fire resistance, installed in fire-resistant compartments, evacuation stairwells, and vertical shafts. However, fires involve not only raging flames but also dense smoke, which is equally lethal because it obstructs breathing and can cause escapees to faint during their escape. Generally, there is a gap between the fire door panel and the ground, allowing dense smoke to flow into the escape route, endangering escapees. Furthermore, ordinary fire doors are easily destroyed by prolonged exposure to fire.
[0003] Therefore, it is necessary to modify it to effectively seal the gaps around the fire door panel, reduce the leakage of fire smoke from the gaps, improve the heat resistance and smoke prevention effect of the fire door, and effectively reduce damage when it encounters a fire. Utility Model Content
[0004] To address the problems mentioned in the background section, the present invention aims to provide a fire door with a smoke-proof structure. This door effectively seals the gaps around the fire door panel, reducing the leakage of smoke and dust from these gaps, improving the fire door's heat resistance and smoke-proof effect, and effectively reducing damage in the event of a fire. It also solves the problem that ordinary fire doors often have gaps between the door panel and the ground, which can allow dense smoke to flow into escape routes, endangering evacuees, and that ordinary fire doors are easily destroyed by prolonged exposure to fire.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a fire door with a smoke-proof structure, comprising a door frame, a fire door body hinged to the left side of the door frame, an automatic door closer between the top of the fire door body and the top of the door frame, a first L-shaped high-temperature resistant sealing strip fixedly connected to the left and right ends and the top of the back of the fire door body, a second L-shaped high-temperature resistant sealing strip fixedly connected to the left and right sides and the top of the inner wall of the door frame, the back of the first L-shaped high-temperature resistant sealing strip abutting against the front of the second L-shaped high-temperature resistant sealing strip, a pushing mechanism provided at the rear of the door frame, the front of the pushing mechanism abutting against the back of the second L-shaped high-temperature resistant sealing strip, a drag plate fixedly connected to the lower back of the fire door body, a plurality of evenly distributed hot melt wires fixedly connected to the bottom of the drag plate, a counterweight fixedly connected to the bottom of the hot melt wires, the front of the counterweight slidingly connected to the back of the fire door body, and a bottom high-temperature resistant sealing gasket fixedly connected to the bottom of the counterweight.
[0006] In a preferred embodiment of this invention, the jacking mechanism includes a number of fixed plates fixedly connected to the rear side of the inner wall of the door frame, and the number of fixed plates are evenly distributed. A jacking rod is slidably connected inside the fixed plate. A pressure frame is fixedly connected to the front end of the jacking rod. The front side of the pressure frame is in contact with the back side of the second L-shaped high-temperature resistant sealing strip. A baffle is fixedly connected to the rear end of the jacking rod. A tension spring is fixedly connected to the rear side of the jacking rod surface. The front end of the tension spring is fixedly connected to the back side of the fixed plate, and the rear end of the tension spring is fixedly connected to the front side of the baffle.
[0007] As a preferred embodiment of this utility model, both the first L-shaped high-temperature resistant sealing strip and the second high-temperature resistant sealing strip have circular grooves inside, and expanded graphite columns are provided inside the circular grooves.
[0008] As a preferred embodiment of this utility model, T-shaped blocks are fixedly connected to both the left and right sides of the front of the counterweight, and T-shaped grooves that cooperate with the T-shaped blocks are opened on both the left and right sides of the back of the fire door body. The surface of the T-shaped block is slidably connected to the inner wall of the T-shaped groove.
[0009] As a preferred embodiment of this utility model, the fire door body includes a heat-resistant steel plate layer, a rock wool layer is fixedly connected to the front side of the heat-resistant steel plate layer, and a high-pressure decorative fire-resistant board is fixedly connected to the front side of the rock wool layer.
[0010] As a preferred embodiment of this utility model, a fitting frame is fixedly connected to the outer surface of the door frame, and a plurality of evenly distributed sealing grooves are formed on the surface of the fitting frame.
[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0012] 1. This utility model features a first L-shaped high-temperature resistant sealing strip around the back of the fire door body and a second L-shaped high-temperature resistant sealing strip on the inner wall of the door frame. When the fire door is closed, the first and second L-shaped high-temperature resistant sealing strips interlock. A jacking mechanism applies pressure to the back of the second L-shaped sealing strip, causing it to tilt forward and fit tightly against the back of the first L-shaped sealing strip, thus improving the sealing effect. In the event of a fire, the temperature around the fire door rises, the hot-melt wire melts, and the counterweight loses its support and slides towards the ground under gravity. This causes the bottom high-temperature resistant sealing pad to move downwards, contacting the ground and sealing the gap between the bottom of the fire door body and the ground. This effectively seals the gaps around the fire door panel, reducing the leakage of smoke and dust from the gaps, improving the heat resistance and smoke prevention of the fire door, and effectively reducing damage in the event of a fire.
[0013] 2. This utility model utilizes a combination of a fixing plate, a top rod, a pressure frame, a baffle plate, and a tension spring. Since the fixing plate is fixed inside the rear of the door frame, the tension spring causes the baffle plate to move forward. When the baffle plate moves forward, it causes the top rod to move forward. When the top rod moves forward, it causes the pressure frame to move forward, thereby pushing the second L-shaped high-temperature resistant sealing strip forward to closely fit the first L-shaped high-temperature resistant sealing strip, thus improving the smoke prevention effect. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of this utility model;
[0015] Figure 2 This is a schematic diagram of the rear view structure of this utility model;
[0016] Figure 3 This is a schematic diagram of the cross-sectional structure of the present invention viewed from below;
[0017] Figure 4 This utility model Figure 3 A magnified structural diagram of A in the middle;
[0018] Figure 5 This is a schematic diagram of the cross-sectional structure of the main body of the protective door of this utility model.
[0019] In the diagram: 1. Door frame; 2. Fire door body; 3. First L-shaped high-temperature resistant sealing strip; 4. Second L-shaped high-temperature resistant sealing strip; 5. Pushing mechanism; 6. Dragging plate; 7. Hot melt wire; 8. Counterweight block; 9. Bottom high-temperature resistant sealing gasket; 10. Fixing plate; 11. Push rod; 12. Pressure frame; 13. Baffle plate; 14. Tension spring; 15. Expanded graphite column; 16. T-shaped block; 17. T-shaped groove; 18. Heat-resistant steel plate layer; 19. Rock wool layer; 20. High-pressure decorative fire-resistant board; 21. Fitting frame. Detailed Implementation
[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0021] like Figures 1 to 5As shown, the present invention provides a fire door with a smoke-proof structure, including a door frame 1. A fire door body 2 is hinged to the left side of the inside of the door frame 1. An automatic door closer is provided between the top of the fire door body 2 and the top of the door frame 1. A first L-shaped high-temperature resistant sealing strip 3 is fixedly connected to the left and right ends and the top of the back of the fire door body 2. A second L-shaped high-temperature resistant sealing strip 4 is fixedly connected to the left and right sides and the top of the inner wall of the door frame 1. The back of the first L-shaped high-temperature resistant sealing strip 3 is in contact with the front of the second L-shaped high-temperature resistant sealing strip 4. A jacking mechanism 5 is provided at the rear inside the door frame 1. The front of the jacking mechanism 5 is in contact with the back of the second L-shaped high-temperature resistant sealing strip 4. A drag plate 6 is fixedly connected to the lower back of the fire door body 2. A number of evenly distributed hot melt wires 7 are fixedly connected to the bottom of the drag plate 6. A counterweight 8 is fixedly connected to the bottom of the hot melt wires 7. The front of the counterweight 8 is slidably connected to the back of the fire door body 2. A bottom high-temperature resistant sealing gasket 9 is fixedly connected to the bottom of the counterweight 8.
[0022] refer to Figure 2 and Figure 4 The jacking mechanism 5 includes a number of fixed plates 10 fixedly connected to the rear side of the inner wall of the door frame 1, and the number of fixed plates 10 are evenly distributed. A jacking rod 11 is slidably connected inside the fixed plate 10. A pressure frame 12 is fixedly connected to the front end of the jacking rod 11. The front side of the pressure frame 12 is in contact with the back side of the second L-shaped high-temperature resistant sealing strip 4. A baffle 13 is fixedly connected to the rear end of the jacking rod 11. A tension spring 14 is fixedly connected to the rear side of the surface of the jacking rod 11. The front end of the tension spring 14 is fixedly connected to the back side of the fixed plate 10, and the rear end of the tension spring 14 is fixedly connected to the front side of the baffle 13.
[0023] As a technical optimization of this utility model, by setting up a fixing plate 10, a top rod 11, a pressure frame 12, a baffle plate 13 and a tension spring 14, since the fixing plate 10 is fixed inside the rear of the door frame 1, the tension force generated by the tension spring 14 drives the baffle plate 13 to move forward. When the baffle plate 13 moves forward, it drives the top rod 11 to move forward. When the top rod 11 moves forward, it drives the pressure frame 12 to move forward, thereby pushing the second L-shaped high-temperature resistant sealing strip 4 to move forward and closely fit the first L-shaped high-temperature resistant sealing strip 3, thus improving the smoke prevention effect.
[0024] refer to Figure 4 The first L-shaped high-temperature resistant sealing strip 3 and the second high-temperature resistant sealing strip both have circular grooves inside, and expanded graphite columns 15 are provided inside the circular grooves.
[0025] As a technical optimization of this utility model, by setting up the expanded graphite column 15, when a fire occurs, the temperature of the first L-shaped high-temperature resistant sealing strip 3 and the second L-shaped high-temperature resistant sealing strip 4 rises, and the expanded graphite column 15 inside expands due to the heat, causing the first L-shaped high-temperature resistant sealing strip 3 and the second L-shaped high-temperature resistant sealing strip 4 to expand in volume, squeezing the gap at the contact surface and closing the gap, thereby further improving the smoke prevention effect.
[0026] refer to Figure 3 T-shaped blocks 16 are fixedly connected to the left and right sides of the front of the counterweight 8. T-shaped grooves 17 that cooperate with the T-shaped blocks 16 are opened on the left and right sides of the back of the fire door body 2. The surface of the T-shaped block 16 is slidably connected to the inner wall of the T-shaped groove 17. Both the T-shaped block 16 and the counterweight 8 are made of ceramic material, which has good stability and will not expand or deform due to temperature rise, affecting the normal sliding of the counterweight 8.
[0027] As a technical optimization of this utility model, by setting the T-shaped block 16 and the T-shaped groove 17 in cooperation, when the thermal fuse 7 melts and the counterweight 8 falls due to fire, the T-shaped block 16 slides downward inside the T-shaped groove 17, which guides the counterweight 8 so that it can only move vertically downward. This avoids the counterweight 8 tilting and falling off when moving downward, which would prevent the bottom high-temperature sealing gasket 9 from accurately sealing the bottom gap of the fire door body 2.
[0028] refer to Figure 5 The fire door body 2 includes a heat-resistant steel plate layer 18, a rock wool layer 19 fixedly connected to the front of the heat-resistant steel plate layer 18, and a high-pressure decorative fire-resistant board 20 fixedly connected to the front of the rock wool layer 19.
[0029] As a technical optimization of this utility model, the overall strength and heat resistance of the fire door body 2 are improved by setting a heat-resistant steel plate layer 18, which avoids the deformation of the fire door body 2 due to airflow impact and high temperature when encountering fire. By setting a rock wool layer 19 and a high-pressure decorative fire-resistant board 20, the fire resistance of the fire door body 2 is improved while its aesthetics are also enhanced.
[0030] refer to Figure 1 A fitting frame 21 is fixedly connected to the outer surface of the door frame 1, and a number of evenly distributed sealing grooves are opened on the surface of the fitting frame 21.
[0031] As a technical optimization of this utility model, by setting the fitting frame 21, when the door frame 1 is installed with the wall, the fitting frame 21 can be embedded into the wall, and the sealing groove is filled with high temperature resistant sealant to seal the gap between the door frame 1 and the wall, thereby further improving the fireproof and smokeproof effect of the fire door.
[0032] The working principle and usage process of this utility model are as follows: A first L-shaped high-temperature resistant sealing strip 3 is set around the back of the fire door body 2, and a second L-shaped high-temperature resistant sealing strip 4 is set on the inner wall of the door frame 1. When the fire door is closed, the first L-shaped high-temperature resistant sealing strip 3 and the second L-shaped high-temperature resistant sealing strip 4 are interlocked. The back of the second L-shaped sealing strip is pressured by the jacking mechanism 5, causing the second L-shaped high-temperature resistant sealing strip 4 to tilt forward and fit tightly against the back of the first L-shaped high-temperature resistant sealing strip 3, thus improving the sealing effect. When a fire occurs, the temperature around the fire door rises, the hot melt wire 7 melts when heated, the counterweight 8 loses support and slides to the ground under the influence of gravity, driving the bottom high-temperature resistant sealing pad 9 to move downward. The bottom high-temperature resistant sealing pad 9 contacts the ground, sealing the gap between the bottom of the fire door body 2 and the ground. This effectively seals the gaps around the fire door panel, reduces the flow of fire smoke from the gaps, improves the heat resistance and smoke prevention effect of the fire door, and effectively reduces damage when encountering a fire.
[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A fire door with a smoke-proof structure, comprising a door frame (1), characterized in that: The fire door body (2) is hinged to the left side of the inside of the door frame (1). An automatic door closer is installed between the top of the fire door body (2) and the top of the door frame (1). A first L-shaped high-temperature resistant sealing strip (3) is fixedly connected to the left and right ends and the top of the back of the fire door body (2). A second L-shaped high-temperature resistant sealing strip (4) is fixedly connected to the left and right sides and the top of the inner wall of the door frame (1). The back of the first L-shaped high-temperature resistant sealing strip (3) is in contact with the front of the second L-shaped high-temperature resistant sealing strip (4). The inside of the door frame (1) A jacking mechanism (5) is provided at the rear of the fire door body (2). The front of the jacking mechanism (5) is in contact with the back of the second L-shaped high-temperature resistant sealing strip (4). A drag plate (6) is fixedly connected to the lower back of the fire door body (2). A number of evenly distributed hot melt wires (7) are fixedly connected to the bottom of the drag plate (6). A counterweight (8) is fixedly connected to the bottom of the hot melt wires (7). The front of the counterweight (8) is slidably connected to the back of the fire door body (2). A bottom high-temperature resistant sealing gasket (9) is fixedly connected to the bottom of the counterweight (8).
2. A fire door with a smoke-proof structure according to claim 1, characterized in that: The jacking mechanism (5) includes a number of fixed plates (10) fixedly connected to the rear side of the inner wall of the door frame (1), and the number of fixed plates (10) are evenly distributed. A jacking rod (11) is slidably connected inside the fixed plate (10). A pressure frame (12) is fixedly connected to the front end of the jacking rod (11). The front side of the pressure frame (12) is in contact with the back side of the second L-shaped high-temperature resistant sealing strip (4). A baffle (13) is fixedly connected to the rear end of the jacking rod (11). A tension spring (14) is fixedly connected to the rear side of the surface of the jacking rod (11). The front end of the tension spring (14) is fixedly connected to the back side of the fixed plate (10), and the rear end of the tension spring (14) is fixedly connected to the front side of the baffle (13).
3. A fire door with a smoke-proof structure according to claim 1, characterized in that: Both the first L-shaped high-temperature resistant sealing strip (3) and the second high-temperature resistant sealing strip have circular grooves inside, and expanded graphite columns (15) are provided inside the circular grooves.
4. A fire door with a smoke-proof structure according to claim 1, characterized in that: T-shaped blocks (16) are fixedly connected to the left and right sides of the front of the counterweight (8), and T-shaped grooves (17) that cooperate with the T-shaped blocks (16) are opened on the left and right sides of the back of the fire door body (2). The surface of the T-shaped block (16) is slidably connected to the inner wall of the T-shaped groove (17).
5. A fire door with a smoke-proof structure according to claim 1, characterized in that: The fire door body (2) includes a heat-resistant steel plate layer (18), a rock wool layer (19) is fixedly connected to the front of the heat-resistant steel plate layer (18), and a high-pressure decorative fire-resistant board (20) is fixedly connected to the front of the rock wool layer (19).
6. A fire door with a smoke-proof structure according to claim 1, characterized in that: The outer surface of the door frame (1) is fixedly connected to a fitting frame (21), and the surface of the fitting frame (21) is provided with a number of evenly distributed sealing grooves.