Fire door with smoke-proof sealing strip

Abstract

The utility model discloses a fireproof door with smokeproof sealing strip belongs to building fire prevention technical field, including installation frame, left door, right door, sealing mechanism and barrier-free mechanism, sealing mechanism is through the outer frame sealing strip and outer frame clamping strip of setting between the door leaf and installation frame, and the door-to-door sealing strip and the door gap clamping strip of setting between left and right door, realizes the reliable sealing of door leaf all around and door gap, and barrier-free mechanism sets up in ground, including the installation plate that can go up and down in the installation groove, the recessed sealing strip and spring, and through the temperature sensing fuse in normal temperature limit its spring out. The utility model discloses through combined type sealing mechanism to improve the overall air tightness, at the same time, through the barrier-free mechanism of ground burying, in ordinary times realized ground level barrier-free traffic, and can automatically complete the door bottom plugging when the fire, and give consideration to the convenience of daily use and the safety when the fire, and the structure is reliable, and the practicality is strong.

Description

Technical Field

[0001] This utility model relates to the field of building fire protection technology, and in particular to a fire door with a smoke-proof sealing strip. Background Technology

[0002] Fire doors are indispensable and critical fire protection facilities in modern buildings. In the event of a fire, they effectively isolate the fire source, prevent the spread of smoke, and create a safe fire compartment, facilitating evacuation and fire rescue. The key to a fire door's effectiveness in a fire lies in the overall sealing performance of the door.

[0003] To achieve fire and smoke prevention, existing fire doors typically have sealing strips installed at the joint between the door leaf and the frame. For double-leaf fire doors, the seam between the two leaves when closed is also a critical sealing point. However, the sealing structures in existing technologies are often relatively simple, and gaps may exist due to installation inaccuracies or long-term use, leading to incomplete sealing. This can pose a risk of failing to prevent the rapid spread of toxic fumes in the early stages of a fire.

[0004] More importantly, traditional techniques for sealing the gap at the bottom of door panels typically involve installing a fixed threshold or a lower door frame protruding above the ground. While this structure provides some sealing, it creates a physical obstacle on the ground. In public places such as hospitals, shopping malls, and office buildings, this threshold severely hinders the smooth passage of wheelchairs, hospital beds, or trolleys, contradicting modern building accessibility principles. Furthermore, in the event of a fire or chaotic evacuation, this small protrusion can easily become a tripping hazard.

[0005] In summary, while pursuing comprehensive and reliable sealing performance, existing fire door technologies often struggle to simultaneously meet the requirements of convenience for daily use and unimpeded passage. In particular, there is a structural contradiction between the sealing of the bottom of the door and the flatness of the ground, and the sealing methods around the door leaf also need improvement, resulting in insufficient overall fire and smoke protection reliability and safety in use.

[0006] Therefore, this utility model proposes a fire door with a smoke-proof sealing strip to overcome the shortcomings of the prior art. Utility Model Content

[0007] To overcome the above shortcomings, this utility model provides a fire door with a smoke-proof sealing strip, which aims to improve the existing technology of fire doors with smoke-proof sealing strips. These doors often have a fixed threshold at the bottom, which prevents unimpeded passage and poses a safety hazard in emergency situations. In addition, the sealing structure between the door leaf and the door frame, and between the door leaves, is relatively simple and the overall airtightness is insufficient.

[0008] To achieve the above objectives, this utility model provides a fire door with a smoke-proof sealing strip, comprising: a mounting frame, a left door and a right door, a sealing mechanism and an accessibility mechanism.

[0009] The sealing mechanism includes an outer frame sealing strip, an outer frame retaining strip, a door gap sealing strip, and a door seam retaining strip.

[0010] The outer frame sealing strip is embedded in the inner side of the mounting frame. The outer frame clip is fixed to the outer edges of the left and right doors and engages with the outer frame sealing strip when the doors are closed. The door gap sealing strip is set in the side groove of the left door. The door gap clip protrudes from the side of the right door and engages with the side groove of the left door and fits against the door gap sealing strip when the door is closed.

[0011] Preferably, the outer frame sealing strip and the door sealing strip are made of a material that expands when heated.

[0012] Preferably, the fire door with smoke-proof sealing strip also includes a ground, and the barrier-free mechanism is disposed in the ground, the barrier-free mechanism including an installation groove formed in the ground.

[0013] Preferably, the barrier-free mechanism further includes a mounting plate, a recessed sealing strip, and a spring. The mounting plate is movably accommodated within the mounting groove, the recessed sealing strip is fixedly connected to the top of the mounting plate, and the spring is disposed between the mounting plate and the bottom of the mounting groove.

[0014] Preferably, the barrier-free mechanism further includes mounting blocks and a fusible strip. The mounting blocks are fixed to both ends of the mounting groove, and the fusible strip is connected between the two mounting blocks and abuts against and restricts the upward movement of the mounting plate under the action of the spring force at room temperature. It is used to trigger the upward movement of the recessed sealing strip by fusing in the event of a fire.

[0015] Preferably, the fire door with smoke-proof sealing strip further includes a bottom sealing strip, which is fixedly connected to the bottom of the left door and the right door and is used to fit against the recessed sealing strip that pops out from the barrier-free mechanism to jointly seal the bottom gap of the door.

[0016] Preferably, at least one of the recessed sealing strip and the bottom door sealing strip is made of a material that expands when heated.

[0017] Preferably, the device further includes a door closer and a door lock. The door closer is installed between the mounting frame and the left or right door and is used to automatically close the door after it is opened. The door lock is used to reliably lock the left and right doors after they are closed.

[0018] This utility model has the following beneficial effects:

[0019] 1. In this utility model, by setting a sealing mechanism, the mechanism includes a sealing component that engages with a sealing strip between the door leaf and the mounting frame via a locking strip, and a sealing component that engages with a door gap locking strip between the left and right doors via a protruding door gap locking strip and a door gap sealing strip in a groove. This solves the problem that existing double-leaf fire doors have simple sealing structures and insufficient airtightness at the door gaps around the door leaf when the door leaf is closed, which easily leads to early smoke leakage. This achieves multiple and effective sealing around the door leaf, with a reliable sealing structure, and significantly improves the overall airtightness and smoke prevention performance of the fire door.

[0020] 2. In this utility model, by setting up an accessible mechanism in the ground, the mechanism includes a lifting and sealing component driven by a spring and limited by a fusible strip at room temperature. This solves the problem that existing fire doors often have thresholds protruding from the ground at the bottom, which hinder the passage of wheelchairs and other equipment and easily cause people to trip during emergency evacuation. It achieves the effect of keeping the ground completely flat and enabling accessible passage under normal conditions, and automatically rising to seal the gap at the bottom of the door in case of fire, thus taking into account both daily convenience and fire safety. Attached Figure Description

[0021] Figure 1 This is a perspective view of a fire door with a smoke-proof sealing strip proposed in this utility model;

[0022] Figure 2 This is a schematic diagram of a recessed sealing strip for a fire door with a smoke-proof sealing strip, as proposed in this utility model.

[0023] Figure 3 This is a cross-sectional schematic diagram of the right door of a fire door with a smoke-proof sealing strip proposed in this utility model;

[0024] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0025] Figure 5 This is an exploded schematic diagram of the fusion strip of a fire door with a smoke-proof sealing strip proposed in this utility model.

[0026] Legend:

[0027] 1. Floor; 2. Wall; 3. Mounting frame; 4. Right door; 5. Door lock; 6. Left door; 7. Sealing mechanism; 701. Outer frame sealing strip; 702. Outer frame retaining strip; 703. Door gap retaining strip; 704. Door gap sealing strip; 705. Door bottom sealing strip; 8. Barrier-free mechanism; 801. Recessed sealing strip; 802. Mounting groove; 803. Spring; 804. Mounting plate; 805. Fusible strip; 806. Mounting block; 9. Door closer; 10. Hinge. Detailed Implementation

[0028] 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.

[0029] Reference Figures 1-5 This utility model provides a fire door with a smoke-proof sealing strip, which aims to solve the problems of existing fire doors having a threshold at the bottom that prevents unobstructed passage on the ground, and the insufficient sealing structure between the door leaf and the door frame and between the door leaf, which affects the overall fire and smoke prevention effect.

[0030] The fire door with smoke-proof sealing strip includes a mounting frame 3, a left door 6 and a right door 4. The mounting frame 3 is fixed inside the wall 2 and serves as the mounting base for the entire fire door. The left door 6 and the right door 4 are rotatably connected to both sides of the mounting frame 3 by hinges 10. The left door 6 and the right door 4 together constitute the main body of the door leaf that allows passage.

[0031] It also includes a sealing mechanism 7 and an accessibility mechanism 8. The sealing mechanism 7 is used to provide a reliable seal around the door and between the door panels when the door is closed, while the accessibility mechanism 8 is used to automatically close the gap at the bottom of the door in the event of a fire, while keeping the ground flat and unobstructed under normal circumstances.

[0032] To provide a more proactive and reliable smoke and fire prevention effect in the event of a fire, both the outer frame sealing strip 701 and the door sealing strip 704 are made of a heat-expanding material. This material maintains its flexibility and elasticity at room temperature, ensuring smooth opening and closing of doors and basic sealing. When a fire causes the ambient temperature to rise sharply, for example, to 150 to 200 degrees Celsius, the heat-expanding material will undergo a rapid chemical reaction and expand violently, instantly increasing its volume to several times or even dozens of times its original volume. The dense carbon layer formed after expansion will completely fill all the tiny gaps between the left door 6, the right door 4 and the mounting frame 3, as well as the door gap between the left door 6 and the right door 4. This temperature-activated self-expanding sealing behavior does not require any external power or mechanical command, achieving passive active sealing. It can effectively prevent the spread of high-temperature toxic smoke and flames, buying valuable time for personnel evacuation and rescue.

[0033] To achieve barrier-free passage under the door and automatic sealing in case of fire, a ground 1 is also included. The barrier-free mechanism 8 is completely installed in the ground 1. Specifically, an installation groove 802 is pre-cut in the ground 1 directly below the door leaf. The depth and size of the installation groove 802 match the overall size of the barrier-free mechanism 8, so that when the barrier-free mechanism 8 is not in operation, its top surface is completely flush with the surface of the ground 1, thus forming a flat passage without any physical threshold or protrusion. This greatly facilitates the barrier-free passage of wheelchairs, hospital beds, trolleys and other equipment, and avoids the risk of pedestrians tripping during emergency evacuation, improving the safety and convenience of passage.

[0034] The internal structure of the barrier-free mechanism 8 includes a mounting plate 804, a recessed sealing strip 801, and a spring 803. The mounting plate 804 is usually a rigid strip plate that runs through the entire width of the doorway, such as a metal plate. The mounting plate 804 can be movably accommodated in the mounting groove 802. The recessed sealing strip 801 is fixedly connected to the top of the mounting plate 804, forming the main body that pops up to achieve sealing. The spring 803 is preferably a plurality of compression springs evenly distributed along the length of the mounting plate 804. The spring 803 is disposed between the mounting plate (804) and the bottom of the mounting groove 802, and is in a compressed state during installation, continuously providing an upward pre-tightening force to the mounting plate 804.

[0035] The accessibility mechanism 8 also includes mounting blocks 806 and fusible strips 805. Mounting blocks 806 are two rigid fasteners respectively fixed to both ends of the mounting groove 802 to provide a stable anchor point. Fusible strips 805 are one or more temperature-sensitive components made of low-melting-point alloy material. Fusible strips 805 are horizontally connected between the mounting blocks 806 at both ends, and the position of fusible strips 805 is exactly above or to the side of the mounting plate 804. Under normal temperature conditions, fusible strips 805, with their inherent structural strength, act as physical blocks to abut and restrict the upward movement of the mounting plate 804 under the elastic force of spring 803, so that the entire accessibility mechanism 8 remains in a ready state stored underground.

[0036] It also includes a bottom door sealing strip 705, which is fixedly connected to the bottom edge of the left door 6 and the right door 4. When a fire occurs, the high temperature causes the fusible strip 805 to melt and break, and the restriction effect on the mounting plate 804 disappears instantly. The energy-storing spring 803 immediately releases its elastic force, pushing the mounting plate 804 together with the recessed sealing strip 801 on its top to pop up quickly. Finally, the recessed sealing strip 801 that pops up tightly squeezes and adheres to the bottom door sealing strip 705 at the bottom of the door leaf, completing the rapid sealing of the bottom gap of the door.

[0037] To further enhance the sealing effect at the bottom of the door, at least one of the recessed sealing strip 801 and the bottom sealing strip 705 is also made of a heat-expanding material. After the recessed sealing strip 801 pops out and physically adheres to the bottom sealing strip 705 to complete the initial mechanical seal, if the fire temperature continues to rise, the heat-expanding material will expand further, forming a stronger compressive force and a denser carbonized sealing layer between the contact surfaces of the two sealing strips. This achieves double insurance of mechanical seal and expansion seal, ensuring that the fireproof and smokeproof performance of the bottom of the door remains reliable even in extreme situations such as uneven ground or door deformation.

[0038] It also includes a door closer 9 and a door lock 5. The door closer 9 is installed between the mounting frame 3 and the left door 6 or the right door 4. Its function is to automatically and smoothly close the opened door after personnel pass through, ensuring that the fire door is always in a ready-to-closed state, creating the preconditions for the sealing mechanism 7 and the barrier-free mechanism 8 to function. The door lock 5 is used to reliably lock the left door 6 and the right door 4 after the door is completely closed, preventing the door from being forced open under the pressure difference between inside and outside the fire scene, thereby ensuring that all sealing strips can be kept in an effective compressed or locked state.

[0039] The sealing mechanism 7 includes an outer frame sealing strip 701, an outer frame retaining strip 702, a door gap sealing strip 704, and a door seam retaining strip 703. The outer frame sealing strip 701 is embedded in the inner peripheral side wall of the mounting frame 3, and the outer frame retaining strip 702 is fixed to the outer edges of the left door 6 and right door 4 corresponding to the mounting frame 3. When the left door 6 and right door 4 are closed, the outer frame retaining strip 702 and the outer frame sealing strip 701 on the inner side of the mounting frame 3 are tightly locked together to form a first seal, preventing smoke from leaking from the gap between the door leaf and the door frame. The door sealing strip 704 is set in the side groove of the left door 6, and the door gap retainer 703 is set in the closed side of the right door 4 in a raised structure. When the right door 4 and the left door 6 are closed, the door gap retainer 703 of the right door 4 is just locked into the side groove of the left door 6 and closely fits with the door sealing strip 704 in the groove, forming a second seal for the gap between the double doors, and constructing a complete sealing barrier for the periphery of the door leaf and the gap between the door leaves, which significantly improves the airtightness.

[0040] Working principle: Under normal daily use, the left door 6 and right door 4 are kept closed by the door closer 9 and locked in the mounting frame 3 by the door lock 5. At this time, the outer frame retaining strip 702 of the left door 6 and right door 4 are engaged with the outer frame sealing strip 701 of the inner side of the mounting frame 3. The door gap retaining strip 703 on the side of the right door 4 is also engaged in the groove of the left door 6 and is in contact with the door gap sealing strip 704, forming a basic airtight seal. At the same time, the barrier-free mechanism 8 set in the ground 1 is in standby state. The fuse strip 805 remains intact, and its structural strength resists the elastic force of the spring 803, so that the mounting plate 804 and its top recessed sealing strip 801 are completely housed in the mounting groove 802, and its top surface is flush with the surface of the ground 1, ensuring barrier-free passage.

[0041] When a fire occurs, the temperature at the fire scene rises rapidly. First, the sealing mechanism 7 arranged between the door leaf and the door frame and between the two door leaves reacts. The outer frame sealing strip 701 and the door sealing strip 704, which are made of heat-expanding materials, expand rapidly after being heated. The resulting dense carbon layer completely seals all gaps between the door leaf and the mounting frame 3, as well as between the left door 6 and the right door 4, preventing the penetration of smoke and flames in the first instance.

[0042] At the same time, the high temperature of the fire will also be transmitted to the ground. When the temperature reaches the melting point of the fusible strip 805, the fusible strip 805 melts and breaks, thereby releasing the restriction on the mounting plate 804. Under the strong elastic force of the pre-compressed spring 803, the mounting plate 804 is quickly pushed upward, causing the recessed sealing strip 801 at its top to pop up together. Finally, the recessed sealing strip 801 rises to a position where it is tightly fitted with the bottom sealing strip 705 at the bottom of the left door 6 and the right door 4, completing the mechanical sealing of the bottom gap of the door. If the recessed sealing strip 801 or the bottom sealing strip 705 is also a material that expands when heated, it will expand further at high temperature, forming a more reliable double sealing effect. Through this multi-point, multi-stage, active and passive sealing method, the comprehensive fireproof and smoke-proof sealing of the entire fire door opening is achieved.

Claims

1. A fire door with a smoke-proof sealing strip, comprising: Mounting frame (3), which is fixed inside the wall (2); Left door (6) and right door (4), the left door (6) and the right door (4) are rotatably connected to the mounting frame (3) by hinges (10); Its characteristic is that it further includes: Sealing mechanism (7) and barrier-free mechanism (8); The sealing mechanism (7) includes: The outer frame sealing strip (701) and the outer frame retaining strip (702) are provided. The outer frame sealing strip (701) is embedded in the inner side of the mounting frame (3). The outer frame retaining strip (702) is fixed to the outer edge of the left door (6) and the right door (4) and engages with the outer frame sealing strip (701) when the door is closed. The door sealing strip (704) and the door gap retainer (703) are provided. The door sealing strip (704) is disposed in the side groove of the left door (6). The door gap retainer (703) is protruding from the side of the right door (4) and is engaged in the side groove of the left door (6) and fits against the door sealing strip (704) when the door is closed.

2. The fire door with smoke-proof sealing strip according to claim 1, characterized in that, The outer frame sealing strip (701) and the door sealing strip (704) are made of a material that expands when heated.

3. The fire door with smoke-proof sealing strip according to claim 1, characterized in that, It also includes a ground (1), and the barrier-free mechanism (8) is disposed in the ground (1); the barrier-free mechanism (8) includes a mounting groove (802), which is opened in the ground (1).

4. The fire door with smoke-proof sealing strip according to claim 3, characterized in that, The barrier-free mechanism (8) further includes a mounting plate (804), a recessed sealing strip (801), and a spring (803). The mounting plate (804) is movably accommodated in the mounting groove (802). The recessed sealing strip (801) is fixedly connected to the top of the mounting plate (804). The spring (803) is disposed between the mounting plate (804) and the bottom of the mounting groove (802).

5. The fire door with smoke-proof sealing strip according to claim 4, characterized in that, The barrier-free mechanism (8) further includes a mounting block (806) and a fusible strip (805). The mounting block (806) is fixed to both ends of the mounting groove (802). The fusible strip (805) is connected between the two mounting blocks (806) at both ends. The fusible strip (805) abuts against and restricts the upward movement of the mounting plate (804) under the elastic force of the spring (803) at room temperature.

6. The fire door with smoke-proof sealing strip according to claim 5, characterized in that, It also includes a bottom door sealing strip (705), which is fixedly connected to the bottom of the left door (6) and the right door (4). After the fusible strip (805) melts, the recessed sealing strip (801) is pushed by the spring (803) to move the mounting plate (804) upward and fit into the bottom door sealing strip (705).

7. The fire door with smoke-proof sealing strip according to claim 6, characterized in that, At least one of the recessed sealing strip (801) and the bottom door sealing strip (705) is made of a material that expands when heated.

8. The fire door with smoke-proof sealing strip according to claim 1, characterized in that, It also includes a door closer (9) and a door lock (5), the door closer (9) being installed between the mounting frame (3) and the left door (6) or the right door (4), and the door lock (5) being used to lock the left door (6) and the right door (4).

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