A fire and smoke door

Abstract

This utility model discloses a heat-insulating, fire-resistant, and airtight door, comprising a steel door frame and door leaf, and further including a fire-resistant expansion seal, a first airtight and sound-insulating seal, and a liftable sealing strip. The inner end of the door frame is L-shaped, and the outer side of the inner end of the door frame has a U-shaped groove extending from the outside in. The door leaf is hinged to the door frame by fire-resistant hinges. The first end of the fire-resistant expansion seal is installed in the U-shaped groove, and the second end of the fire-resistant expansion seal contacts the inner side of the door leaf. The first airtight and sound-insulating seal is installed on the outer end face of the door leaf and corresponds to the inner end face of the door frame. The liftable sealing strip is installed at the bottom of the door leaf for sealing the door gaps. Through the coordinated installation positions and methods of the fire-resistant expansion seal, the first airtight and sound-insulating seal, and the liftable sealing strip, good fire resistance, airtightness, heat insulation, sound insulation, and wind pressure resistance are provided when closed, ensuring the overall stable and reliable performance of the door.

Description

Technical Field

[0001] This utility model relates to the field of airtight door technology, specifically to a heat-insulating and fireproof airtight door. Background Technology

[0002] The core feature of an airtight door lies in its excellent airtight performance. Through inflatable sealing strips or mechanical clamping mechanisms, an airtight door can form a tight seal when closed, effectively preventing the flow of air, dust, microorganisms, and other substances.

[0003] However, the core materials and seals of existing airtight doors usually do not have good fire resistance. Once exposed to fire, their sealing structure will quickly fail and cannot meet fire protection requirements. Utility Model Content

[0004] The purpose of this invention is to provide a heat-insulating, fireproof, and airtight door to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, this utility model provides a heat-insulating, fire-resistant, and airtight door, which includes a steel door frame and two door leaves. It also includes a fire-resistant expansion seal, a first airtight and sound-insulating seal, and a liftable sealing strip. The inner end of the door frame is L-shaped, and the outer side of the inner end of the door frame has a U-shaped groove extending from the outside to the inside. The two door leaves are hinged to the door frame by fire-resistant hinges. The cross-section of the inner ends of the two door leaves is L-shaped and fits each other. The first end of the fire-resistant expansion seal is installed in the U-shaped groove, and the second end of the fire-resistant expansion seal contacts the inner side of the corresponding door leaf. The first airtight and sound-insulating seal is installed on the side of the inner end of one door leaf and contacts the side of the inner end of the other door leaf. The liftable sealing strip is installed at the bottom of the door leaf for sealing the door gap.

[0006] Furthermore, the fireproof expansion seal includes a connecting part and a contact part, both of which are hollow inside. The connecting part is disposed in the U-shaped groove and connected to the inner wall of the U-shaped groove. The contact part is located outside the U-shaped groove. The first end of the contact part is connected to the connecting part, and the second end of the contact part is in contact with the door leaf.

[0007] Furthermore, the cross-section of the connecting portion is pentagonal, and the cross-section of the contact portion is an arc protruding along the second end of the contact portion.

[0008] Furthermore, both ends of the connecting portion are provided with grooves.

[0009] Furthermore, each end of the contact portion is provided with a support portion, and the two support portions are respectively connected to the end face of the U-shaped groove and the inner wall of the door frame.

[0010] Furthermore, it also includes a plurality of second airtight soundproof seals, which are respectively disposed on the side surface of the outer end of the door leaf and the top surface of the door leaf, and each corresponds to the inner wall of the door frame.

[0011] Furthermore, a fireproof latch is installed on any of the door panels.

[0012] Furthermore, it also includes a fire-prevention sequencer, the two ends of which are respectively connected to the two door panels.

[0013] Furthermore, the door leaf includes a panel and a foamed cement board, the panel being hollow inside, and the foamed cement board filling the interior of the panel.

[0014] The beneficial effects of this utility model are as follows: By coordinating the installation positions and methods of the fire-resistant expansion seal, the first airtight soundproof seal, and the lifting sealing strip, this utility model ensures the overall stability and reliability of the door's performance. The steel door frame and door leaf possess high strength and durability, capable of withstanding certain external impacts and resisting wind pressure, thus extending the door's service life. Furthermore, by incorporating the fire-resistant expansion seal, it can rapidly expand in the event of a fire, effectively sealing the gap between the door frame and door leaf, preventing the spread of flames and high-temperature gases, and ensuring fire resistance. Simultaneously, through the synergistic effect of the first airtight soundproof seal and the lifting sealing strip, this airtight door forms a multi-layered, strict seal when closed, thereby ensuring an airtight environment inside the door. In short, this heat-insulating and fire-resistant airtight door provides excellent fire resistance, airtightness, heat insulation, sound insulation, and wind pressure resistance when closed, offering users a safer, more comfortable, and stable operating environment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the elevation structure of an embodiment of the double-door design of this utility model.

[0016] Figure 2 This is a schematic diagram of the horizontal cross-sectional structure of an embodiment of the double door of this utility model.

[0017] Figure 3 This is a longitudinal cross-sectional structural diagram of an embodiment of the double-door design of this utility model.

[0018] Figure 4 This is a partial cross-sectional structural diagram of an embodiment of the double-door design of this utility model.

[0019] Figure 5 This is a schematic diagram of the elevation structure of a single-door embodiment of the present invention.

[0020] Figure 6 This is a schematic diagram of the cross-sectional structure of a single-door embodiment of the present invention.

[0021] The components include: 1. Door frame; 2. Door leaf; 3. Fire-resistant expansion seal; 4. First airtight soundproof seal; 5. Lifting seal strip; 6. Fire-resistant hinge; 7. Second airtight soundproof seal; 8. Fire-resistant bolt; 9. Fire-resistant sequencer; 10. Fire-resistant lock.

[0022] 11. U-shaped channel; 21. Panel; 22. Foamed cement board; 31. Connecting part; 32. Contact part; 33. Support part. Detailed Implementation

[0023] 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 one embodiment 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.

[0024] To make the objectives, technical solutions and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments.

[0025] In the following description, references to "an embodiment," "an embodiment," "an example," "example," etc., indicate that the described embodiment or example may include a particular feature, structure, characteristic, property, element, or limitation, but not every embodiment or example necessarily includes that particular feature, structure, characteristic, property, element, or limitation. Furthermore, the repeated use of the phrase "an embodiment according to this application," while possibly referring to the same embodiment, does not necessarily refer to the same embodiment.

[0026] like Figures 1-6 As shown, this utility model discloses a heat-insulating, fire-resistant, and airtight door, which includes a steel door frame 1 and a door leaf 2. It possesses high strength and rigidity, capable of withstanding strong winds. In strong winds, the door structure will not easily deform or be damaged, ensuring normal closure and sealing. It also includes a fire-resistant expansion seal 3, a first airtight and sound-insulating seal 4, and a lifting sealing strip 5. The inner end of the door frame 1 is L-shaped, and the outer side of the inner end of the door frame 1 has a U-shaped groove 11 extending inwards. The door leaves 2 are hinged to the door frame 1 via fire-resistant hinges 6. The first end of the fire-resistant expansion seal 3 is installed in the U-shaped groove 11, and the second end of the fire-resistant expansion seal 3 contacts the inner surface of the door leaf 2, providing a specific position for its installation. All seals work together to form a complete sealing system. The first airtight and sound-insulating seal 4 is installed on the outer end face of the door leaf 2, corresponding to the inner end face of the door frame 1. The lifting sealing strip 5 is installed at the bottom of the door leaf 2 to seal door gaps. In this embodiment, the door leaf 2 is also equipped with a fireproof lock 10.

[0027] Under normal circumstances, the fire-resistant expansion seal 3 is in its conventional state, providing a certain degree of auxiliary sealing. In the event of a fire, the ambient temperature rises sharply, and the special material in the fire-resistant expansion seal 3 expands rapidly upon heating. The expanded seal tightly fills the gap between the U-shaped groove 11 of the door frame 1 and the inner side of the door leaf 2, further enhancing the sealing effect and effectively preventing flames, high-temperature gases, and smoke from entering the interior area through these gaps, playing a crucial role in fire prevention and heat insulation.

[0028] When the airtight door is closed, the first airtight soundproof seal 4 fits tightly against the inner end face of the door frame 1, forming a preliminary airtight barrier. This effectively prevents air from flowing through the gap between the door and the door frame 1, thus ensuring an airtight environment inside the door. Simultaneously, the first airtight soundproof seal 4 also effectively absorbs and blocks sound transmission. When sound encounters the first airtight soundproof seal 4, some sound energy is absorbed, and the remaining sound is reflected at the contact surfaces between the first airtight soundproof seal 4 and the door frame 1 and door leaf 2, thereby reducing the intensity of sound transmission through the door and achieving sound insulation.

[0029] During door closing, the retractable sealing strip 5 extends downwards via a specific mechanical device (such as an electrically or manually controlled lifting mechanism) to make tight contact with the ground, filling the gap between the bottom of the door leaf 2 and the ground. When the door needs to be opened, the lifting mechanism retracts the sealing strip upwards, allowing the door leaf 2 to open smoothly. This design ensures that no air leakage channel exists at the bottom of the door when it is closed, further improving the door's airtightness.

[0030] Meanwhile, the fire-resistant expansion seal 3, the first airtight soundproof seal 4, and the lift-type sealing strip 5 form a tight seal when the door is closed, ensuring airtightness inside the door and greatly limiting air exchange between the inside and outside, thus reducing heat transfer. Simultaneously, the steel door frame 1 and door leaf 2 themselves have a certain thermal resistance, which can prevent heat conduction through the door body to a certain extent, thereby achieving a heat insulation effect and maintaining a relatively stable temperature inside the door. In addition, this design also enhances the door's resistance to wind pressure, preventing strong winds from blowing the door open or damaging its sealing performance.

[0031] This invention, through the coordinated installation positions and methods of the fire-resistant expansion seal 3, the first airtight soundproof seal 4, and the lifting sealing strip 5, ensures the overall stable and reliable performance of the door. The steel door frame 1 and door leaf 2 possess high strength and durability, capable of withstanding certain external impacts and resisting wind pressure, thus extending the door's service life. Furthermore, the fire-resistant expansion seal 3 expands rapidly in the event of a fire, effectively sealing the gap between the door frame 1 and door leaf 2, preventing the spread of flames and high-temperature gases, and ensuring fire resistance. Simultaneously, through the synergistic action of the first airtight soundproof seal 4 and the lifting sealing strip 5, the airtight door forms a multi-layered, tight seal when closed, ensuring an airtight environment inside the door. In short, this heat-insulating and fire-resistant airtight door provides excellent fire resistance, airtightness, heat insulation, sound insulation, and wind pressure resistance when closed, offering users a safer, more comfortable, and stable operating environment.

[0032] In one embodiment, the fireproof expansion seal 3 includes a connecting part 31 and a contact part 32, both of which are hollow inside. The connecting part 31 is disposed in the U-shaped groove 11 and connected to the inner wall of the U-shaped groove 11. The contact part 32 is located outside the U-shaped groove 11. The first end of the contact part 32 is connected to the connecting part 31, and the second end of the contact part 32 is in contact with the door leaf 2.

[0033] Under normal conditions of daily use and without fire threat, the connecting portion 31 of the fire-resistant expansion seal 3 is securely installed in the U-shaped groove 11 of the door frame 1 and tightly connected to the inner wall of the U-shaped groove 11. This connection method ensures the stable fixation of the seal on the door frame 1, preventing it from loosening or shifting. The contact portion 32 is located on the outside of the U-shaped groove 11, with its first end reliably connected to the connecting portion 31 and its second end lightly contacting the door leaf 2 or maintaining a small preset gap. At this time, the contact portion 32 mainly plays a preliminary sealing role, reducing the flow of air through the tiny gap between the door frame 1 and the door leaf 2, and maintaining the basic airtight performance of the door.

[0034] When a fire occurs and the ambient temperature rises sharply, the special expansion material inside the fireproof expansion seal 3 begins to function. Since both the connecting part 31 and the contact part 32 are hollow, this provides sufficient expansion space for the expansion material. The expansion material expands rapidly upon heating, first expanding inside the connecting part 31, making the connecting part 31 fit more tightly against the inner wall of the U-shaped groove 11. This further enhances the connection between the seal and the door frame 1, preventing the connection from loosening due to high temperatures.

[0035] Simultaneously, the expansion material within the contact portion 32 also expands rapidly, pushing the contact portion 32 outwards. The second end of the contact portion 32 presses tightly against the door leaf 2, filling all gaps between the door frame 1 U-shaped groove 11 and the door leaf 2, forming a continuous, tight, and high-temperature resistant sealing barrier. This sealing barrier effectively prevents flames, high-temperature gases, and smoke from entering the interior area through the gap between the door frame 1 and the door leaf 2, playing a crucial role in fire prevention and heat insulation.

[0036] In one embodiment, the cross-section of the connecting portion 31 is pentagonal, and the cross-section of the contact portion 32 is an arc protruding along the second end of the contact portion 32.

[0037] The connecting part 31 has a pentagonal cross-section, a unique shape that provides multiple contact surfaces with the inner wall of the U-shaped groove 11 of the door frame 1. During installation, the multiple sides of the pentagon can fit tightly against different parts of the U-shaped groove 11, increasing the friction and contact area between the connecting part 31 and the door frame 1. This ensures that the connecting part 31 is firmly fixed in the U-shaped groove 11 and is not easily loosened by frequent opening and closing of the door or external vibrations. In the event of a fire and a rapid increase in temperature, the expansion material inside the connecting part 31 begins to expand due to heat. Because the connecting part 31 has a pentagonal cross-section, each side expands outward simultaneously during expansion, further enhancing the fit with the inner wall of the U-shaped groove 11.

[0038] The contact portion 32 has a cross-section that protrudes from the second end in an arc shape. When the door is closed, the second end of the arc-shaped contact portion 32 gently contacts the door leaf 2. This arc design makes the contact between the contact portion 32 and the door leaf 2 softer, reducing wear caused by hard contact. It can also adapt to the unevenness that may exist on the surface of the door leaf 2 to a certain extent, playing a preliminary sealing role and preventing air from flowing through the tiny gaps between the door frame 1 and the door leaf 2. When the expansion material inside the contact portion 32 is heated, it will push the arc-shaped contact portion 32 to expand outward. The arc design allows the contact portion 32 to press more evenly on the door leaf 2 when it expands, forming a continuous and smooth sealing surface that fills all the gaps between the door frame 1 and the door leaf 2, effectively preventing the passage of flames, high-temperature gases, and smoke, and playing a crucial role in fireproofing and heat insulation.

[0039] In one embodiment, grooves are provided at both ends of the connecting portion 31. When a fire occurs and the temperature rises sharply, the expansion material inside the connecting portion 31 begins to expand due to heat. The grooves at both ends can guide the direction of expansion, causing the expansion material to expand mainly in the direction of conforming to the inner wall of the U-shaped groove 11, further enhancing the connection between the seal and the door frame 1.

[0040] In one embodiment, both ends of the contact portion 32 are provided with support portions 33, and the two support portions 33 are respectively connected to the end face of the U-shaped groove 11 and the inner wall of the door frame 1.

[0041] It provides solid support for the contact part 32. When the door is closed, the support part 33 is tightly connected to the end face of the U-shaped groove 11 and the inner wall of the door frame 1, stably fixing the contact part 32 in a specific position. At the same time, it forms a preliminary sealing barrier, preventing air from flowing through the tiny gap between the door frame 1 and the door leaf 2, maintaining the airtight performance of the door under normal conditions. In the event of a fire, the support part 33 guides the contact part 32 to expand evenly, making its fit with the door leaf 2 even tighter.

[0042] In one embodiment, there are two door leaves 2, and the outer ends of both door leaves 2 are hinged to the door frame 1 via fireproof hinges 6, making the airtight door a double door. The cross-sections of the inner ends of the two door leaves 2 on the door frame 1 are both L-shaped and fit together, and a second airtight and soundproof sealing element 7 is provided between the inner end faces of the two door leaves 2. This design provides basic shape support for the sealing structure, allowing the door to initially form a relatively enclosed spatial outline when closed.

[0043] The second airtight soundproof seal 7 is installed on the inner side of either door leaf 2 and contacts the inner side of the other door leaf 2. When the door is closed, the seal, through its own elastic deformation, tightly adheres to the contact surface of the inner ends of the two door leaves 2, forming a continuous and tight sealing strip. This sealing method not only prevents airflow, ensures airtightness, reduces indoor and outdoor air exchange, and reduces energy loss, but also effectively blocks sound transmission, thus playing a role in sound insulation.

[0044] In one embodiment, a fireproof latch 8 is installed on any door leaf 2. This effectively prevents the door leaf 2 from being accidentally opened during a fire, providing more evacuation time for people inside the building. Simultaneously, it works in conjunction with other fireproof seals to enhance the door's fire resistance, preventing the spread of flames and high-temperature gases for a longer period, protecting adjacent areas, and reducing fire damage.

[0045] In one embodiment, a fire-prevention sequencer 9 is also included, with its two ends connected to the two door panels 2 respectively. The fire-prevention sequencer 9 ensures that the two door panels 2 close in the correct order and remain tightly closed, preventing the rapid spread of flames and high-temperature gases due to one door panel 2 opening first or not closing properly.

[0046] In one embodiment, the door leaf 2 includes a panel 21 and a foamed cement board 22. The panel 21 is hollow, and the foamed cement board 22 fills the interior of the panel 21. In this embodiment, the door frame 1 is made of 1.2mm cold-rolled galvanized steel sheet, the panel 21 is made of 0.8mm cold-rolled galvanized steel sheet, and the density of the foamed cement board 22 is 300±30kg / m³. 3Foamed cement board 22 is a non-combustible material that can effectively prevent the spread of flames. It can withstand high temperatures for a certain period of time, buying valuable time for personnel evacuation and fire rescue. At the same time, foamed cement board 22 has good thermal insulation properties, which can reduce the transfer of heat from one side of the door leaf 2 to the other.

[0047] When the airtight door is a single-leaf door, there is one door leaf 2. U-shaped grooves 11 are provided on both sides of the inner end of the door frame 1, and fire-resistant expansion seals 3 are installed in each U-shaped groove 11. The two fire-resistant expansion seals 3 are respectively adapted to the two ends of the door leaf 2. First airtight soundproof seals 4 are installed on the outer end face and top of the door leaf 2, respectively, adapted to the door frame 1. A liftable sealing strip 5 is installed at the bottom of the door leaf 2.

[0048] When the airtight door is a double door, there are two door leaves 2. U-shaped grooves 11 are provided on both sides of the inner end of the door frame 1, and fire-resistant expansion seals 3 are installed in each U-shaped groove 11. The two fire-resistant expansion seals 3 are respectively adapted to the outer ends of the two door leaves 2. First airtight soundproof seals 4 are installed on the outer end faces and tops of the two door leaves 2, respectively, adapting to the door frame 1. The cross-sections of the inner ends of the two door leaves 2 are both L-shaped and fit together. A second airtight soundproof seal 7 is provided between the inner end faces of the two door leaves 2. Two lift-type sealing strips 5 are installed at the bottom of the two door leaves 2 respectively.

[0049] Whether it's a single-door or double-door structure, all-around sealing is achieved through the synergistic effect of multiple sealing components. This provides excellent fire resistance, airtightness, thermal insulation, sound insulation, and wind pressure resistance, offering users a safer, more comfortable, and stable operating environment.

[0050] The above description of the disclosed embodiments enables those skilled in the art to implement or use this invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, this invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A heat-insulated, fireproof, and airtight door, comprising a steel door frame and a door leaf, characterized in that: It also includes a fire-resistant expansion seal, a first airtight soundproof seal, and a liftable sealing strip. The inner end of the door frame is L-shaped, and the outer side of the inner end of the door frame has a U-shaped groove extending from the outside to the inside. The door leaves are all hinged to the door frame by fire-resistant hinges. The first end of the fire-resistant expansion seal is installed in the U-shaped groove, and the second end of the fire-resistant expansion seal contacts the inner side of the door leaf. The first airtight soundproof seal is installed on the outer end face of the door leaf and corresponds to the inner end face of the door frame. The liftable sealing strip is installed at the bottom of the door leaf to seal the door gap.

2. The heat-insulating, fireproof, and airtight door according to claim 1, characterized in that: The fireproof expansion seal includes a connecting part and a contact part, both of which are hollow inside. The connecting part is disposed in the U-shaped groove and connected to the inner wall of the U-shaped groove. The contact part is located outside the U-shaped groove. The first end of the contact part is connected to the connecting part, and the second end of the contact part is in contact with the door leaf.

3. The heat-insulating, fireproof, and airtight door according to claim 2, characterized in that: The cross-section of the connecting part is pentagonal, and the cross-section of the contact part is an arc protruding along the second end of the contact part.

4. The heat-insulating, fireproof, and airtight door according to claim 3, characterized in that: Both ends of the connecting part have grooves.

5. A heat-insulating, fireproof, and airtight door according to claim 3, characterized in that: Both ends of the contact portion are provided with support portions, and the two support portions are respectively connected to the end face of the U-shaped groove and the inner wall of the door frame.

6. The heat-insulating, fireproof, and airtight door according to claim 1, characterized in that: The number of door leaves is two, and the outer ends of the two door leaves are hinged to the door frame by the fireproof hinges. The cross-sections of the inner ends of the two door leaves are L-shaped and fit each other. A second airtight soundproof seal is provided between the inner end faces of the two door leaves.

7. A heat-insulating, fireproof, and airtight door according to claim 6, characterized in that: Fireproof latches are installed on any of the door panels.

8. A heat-insulating, fireproof, and airtight door according to claim 6, characterized in that: It also includes a fire-prevention sequencer, the two ends of which are respectively connected to the two door panels.

9. A heat-insulating, fireproof, and airtight door according to claim 1, characterized in that: The door panel includes a panel and a foamed cement board. The panel is hollow inside, and the foamed cement board is filled inside the panel.

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