Fire door and its sealing arrangement
By adopting a vertical support structure and sealing strip design in fire doors, the problem of heat loss caused by the expansion of fire door gaps is solved, achieving a more efficient building energy-saving effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHENZHEN HENGCHANGDA IND CO LTD
- Filing Date
- 2026-06-02
- Publication Date
- 2026-07-14
AI Technical Summary
Traditional fire doors suffer from poor building energy efficiency due to widening gaps during use. In particular, gaps at the connection between the door leaf and the metal frame cause heat loss from air conditioning or heating, affecting the building's thermal insulation performance.
The vertical support structure, including a concealed shaft and a top shaft, provides support to prevent the gap from widening, and the corner protectors and sealing strips compensate for gap wear, enhancing the sealing effect.
It effectively reduces the heat loss from air conditioning or heating at doorways, improving the building's energy efficiency, and further reduces heat loss through the automatic sealing function of the sealing strip.
Smart Images
Figure CN122383205A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of building energy conservation technology, specifically relating to a fire door and its sealing structure. Background Technology
[0002] Fire doors are building components that add fire-resistant filling and sealing elements to the traditional metal door structure to achieve a certain level of fire resistance. However, the mainstream design of traditional fire doors focuses on their fire resistance performance or simply adds thermal insulation materials, resulting in poor insulation of indoor thermal environments and hindering energy conservation and emission reduction in buildings.
[0003] Existing fire doors are generally filled with expanded perlite board, aluminum silicate fiber felt, vermiculite board, rock wool / mineral wool board, etc. as fireproof materials. During production, the fireproof material is made into a door core board and placed into the door frame. There are tiny gaps between the door core board and the door frame and steel plate, which may form thermal bridges and affect the thermal insulation performance.
[0004] Some manufacturers selectively inject pre-mixed magnesium oxide cement, foaming slurry, and other fluid materials directly into the assembled door frame. The fluid material naturally foams and solidifies inside the door frame, forming a seamless core material that adheres to both the door frame and the steel plate.
[0005] In practical applications, the door leaf of a fire door is connected to the metal frame by hinges, which inherently create gaps. Repeated opening and closing causes hinge wear, widening these gaps and deteriorating the door's airtightness, thus reducing the long-term energy efficiency of the fire door. Summary of the Invention
[0006] The purpose of this invention is to provide a fire door and its sealing structure, which can prevent the gaps in the fire door from widening by vertical support through two shafts, and compensate for the wear of the gaps in the fire door, further reducing the heat loss from air conditioning or heating at the door opening and improving the building's energy-saving effect.
[0007] The specific technical solution adopted by this invention is as follows: A fire door includes a frame and a door leaf that are adapted to each other, wherein the door leaf is provided with fireproof and heat-insulating filler, and further includes: The first and second corner brackets are welded alternately to the inside of the frame. The fourth sealing strip is installed at the intervals of the door leaf to seal the door gaps when the door leaf is closed. The concealed shaft and the top shaft are vertically spaced along the frame and located outside the door leaf; The hidden shaft and the top shaft provide support for the door leaf laterally along the frame to straighten the door leaf, so that the closed door leaf can fit tightly against and press against the first and second corner protectors. The elastic deformation of the first and second corner protectors is used to compensate for the wear and tear between the frame and the door leaf.
[0008] As an alternative, both the first and second corners are hollow triangles, with one corner of the hollow triangle facing and contacting the adjacent door leaf.
[0009] As an optional solution, the fourth sealing strip is configured as two strips, which are respectively adhered to both sides of the door leaf, and can seal the door gap from both sides when the door leaf is closed. The fourth sealing strip increases its distance from the door gap when the door is open, thus preventing obstruction of the door opening.
[0010] As an alternative, both of the fourth sealing strips are bent, and the width of the bend is greater than the door gap width when the door is closed. The two fourth sealing strips are equipped with magnetic material inside, which is used to magnetically contact the door leaf, so that the two fourth sealing strips can automatically seal the door gap when the door leaf is closed.
[0011] As an optional solution, a limiting groove perpendicular to the top shaft is provided on the frame, and a first sealing strip is adhered inside the limiting groove; The opening of the limiting groove faces the opening direction of the door leaf, and the first sealing strip is used to seal the gap between the limiting groove and the door leaf.
[0012] As an optional solution, a second sealing strip and a third sealing strip are installed at intervals on the door leaf. The second sealing strip is used to seal the gap between the outer side of the door leaf and the inner side of the frame, and the third sealing strip is used to seal the door gap when the door leaf is closed. The third and fourth sealing strips are spaced apart to avoid obstructing the fourth sealing strip from adhering tightly to the door leaf.
[0013] As an optional solution, the concealed shaft is provided with embedded parts, a first flange and a bushing at intervals; The first flange and bushing are fixed inside the door leaf by screws, and the embedded part is set outside the frame.
[0014] As an optional solution, the top shaft is connected to a second flange and a third flange at its two ends, respectively; The second flange is fixed inside the frame with screws, and the third flange is fixed to the top of the door leaf with screws.
[0015] A sealing structure for a fire door, applied to the aforementioned fire door, comprising: The first and second steel frames are spaced apart; The first decorative panel is installed on the first steel frame and is tightly attached to the fire door; The second decorative panel is installed on the second steel frame and is in close contact with the first decorative panel.
[0016] A sealing structure for a fire door further includes: The fourth steel frame and the cantilever beam are fixed together with screws; The third steel frame is welded to the bottom of the fourth steel frame; The third decorative panel is bonded between the top of the frame and the bottom of the third steel frame.
[0017] The technical effects achieved by this invention are as follows: This invention provides a fire door that enhances building energy efficiency. It features vertical support via two shafts, ensuring the stability of the fire door's rotation and preventing gaps from widening. In use, it reduces heat loss from air conditioning or heating systems at doorways, thus improving building energy efficiency.
[0018] This invention provides a fire door that can improve building energy efficiency. It uses a first and a second corner to compensate for the wear and tear of the fire door gaps, further reducing the heat loss from air conditioning or heating at the door opening and improving the building's energy efficiency.
[0019] This invention provides a fire door that can improve building energy efficiency by adding a sealing strip at the door gap. The sealing strip moves with the two door leaves. When the door leaves are closed, the sealing strip automatically seals the door gap, further reducing the heat loss from air conditioning or heating at the gap and improving the building's energy efficiency. Attached Figure Description
[0020] Figure 1 This is a first structural schematic diagram of the front of a fire door according to Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the first structure on the back of a fire door according to Embodiment 1 of the present invention; Figure 3 This is the invention Figure 1 A first cross-sectional view of a type of fire door; Figure 4 This is a schematic diagram of the second structure of the front of a fire door according to Embodiment 2 of the present invention; Figure 5 This is the invention Figure 4 A second cross-sectional view of a type of fire door; Figure 6 This is a third cross-sectional view of a fire door according to Embodiment 3 of the present invention; Figure 7 This is a fourth cross-sectional view of a fire door according to Embodiment 3 of the present invention; Figure 8 This is a fifth cross-sectional view of a fire door according to Embodiment 4 of the present invention; Figure 9 This is a sixth cross-sectional view of a fire door according to Embodiment 4 of the present invention; Figure 10This is a schematic diagram of the third structure on the front of a fire door according to Embodiment 5 of the present invention; Figure 11 This is the invention Figure 10 The seventh cross-sectional view of a type of fire door; Figure 12 This is the eighth cross-sectional view of a fire door according to Embodiment Six of the present invention; Figure 13 This is the invention Figure 11 Ninth cross-sectional view of a type of fire door.
[0021] The attached diagram lists the components represented by each number as follows: 1. Frame; 101. Frame; 102. Crossbeam; 103. Sequencing device; 104. First corner protector; 105. Second corner protector; 106. Concealed pin; 107. Limiting groove; 108. First sealing strip; 2. Door leaf; 201. Door leaf frame; 202. Fireproof and heat-insulating filler; 203. Steel plate; 204. Decorative layer; 205. Second sealing strip; 206. Third sealing strip; 207. Fourth sealing strip; 208. Fireproof lock; 209. Handle; 3. Concealed shaft; 301. Embedded part; 302. First flange; 303. Shaft sleeve; 4. Top shaft; 401. Second flange; 402. Third flange; 501. First steel frame; 502. Second steel frame; 503. First decorative panel; 504. Second decorative panel; 601. Third decorative panel; 602. Third steel frame; 603. Fourth steel frame; 604. Cantilever beam. Detailed Implementation
[0022] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention.
[0023] Example 1: like Figures 1-3 As shown, a fire door that can save energy in buildings includes a frame 1 and a door leaf 2 that are compatible with each other. Before installation, the frame 1, door leaf 2, concealed shaft 3 and top shaft 4 are pre-processed in the factory. According to the customer's order, the frame 1, door leaf 2, concealed shaft 3 and top shaft 4 of the specified size are selected and transported to the site for installation. During on-site installation, taking a door opening on a flat wall as an example (the door opening dimensions are 4200mm high and 3200mm wide), the workers fix the frame 1 to the wall of the door opening with expansion bolts. The concealed shaft 3 and the top shaft 4 are inserted into the bottom and top of the door leaf 2, respectively. At this time, the door leaf 2, together with the concealed shaft 3 and the top shaft 4, is installed inside the frame 1, so that the exposed part of the concealed shaft 3 is buried in the ground of the door opening. Meanwhile, since the concealed shaft 3 and the top shaft 4 support the outside of the door leaf 2 along the vertical axis of the frame 1, the user can push the door leaf 2 to rotate along the vertical axis to the closed and open states, so that the concealed shaft 3 and the top shaft 4 provide support for the door leaf 2 in the horizontal direction along the frame 1, so as to straighten the door leaf 2, prevent the gap between the door leaf 2 and the frame 1 from widening, reduce the heat loss of air conditioning or heating at the door opening, and improve the building's energy-saving effect.
[0024] See attached document Figure 1 and Figure 2 The frame 1 consists of two vertical side frames 101 and a horizontal beam 102. It can be prefabricated in the factory. During on-site installation, the workers fix a sequencer 103 in the middle of the beam 102 with screws. The sequencer 103 is used to force and limit the closing order of the two door leaves 2, for example, the two door leaves 2 close in the order from left to right.
[0025] See attached document Figure 1 and Figure 3 During factory pre-processing, workers weld the first corner 104 and the second corner 105 at intervals on the outside of the frame 101 to ensure that the interface between the first corner 104 and the second corner 105 and the frame 101 is seamless. After on-site installation, the closed door leaf 2 can be tightly pressed against and squeezed by the first corner 104 and the second corner 105. Under the action of their own elastic potential energy, the first corner 104 and the second corner 105 are tightly pressed against the door leaf 2. The elastic deformation of the first corner 104 and the second corner 105 is used to compensate for the wear of the gap between the frame 1 and the door leaf 2, further reducing the heat loss of air conditioning or heating at the door opening and improving the building's energy-saving effect.
[0026] See attached document Figure 3 The first corner 104 and the second corner 105 can both be made of at least one of polyurethane rubber, butadiene rubber, thermoplastic polyurethane or styrene-butadiene rubber. The two are thermoplasticized into a hollow triangle, with one corner of the hollow triangle facing and contacting the adjacent door leaf 2. When squeezed by the door leaf 2, their elastic potential energy increases and they stick tightly to the door leaf 2. When the door leaf 2 moves away, the two release their elastic potential energy and deform elastically to follow the door leaf 2 and continuously seal the gap between the frame 1 and the door leaf 2.
[0027] See attached document Figure 1To improve the stability of the concealed shaft 3, the door leaf 2 is fixed with a first flange 302 and a bushing 303 by screws. An embedded part 301 is buried in the ground of the door opening, and the concealed shaft 3 is inserted between the embedded part 301, the first flange 302 and the bushing 303. Among them, the embedded part 301 is set outside the frame 1 to provide rotational support for the bottom of the hidden shaft 3, and the first flange 302 and the bushing 303 provide rotational support for the top of the hidden shaft 3, thereby reinforcing the hidden shaft 3.
[0028] See attached document Figure 1 To improve the stability of the top shaft 4, the crossbeam 102 is fixed with a second flange 401 by screws, and the top of the door leaf 2 is fixed with a third flange 402 by screws. During installation, the lower end of the top shaft 4 is connected to the second flange 401 by bearings, and the upper end is locked with bolts through the third flange 402 to maintain the coaxial state of the top shaft 4 and the hidden shaft 3, thereby reducing the degree of shaking of the two when the door leaf 2 is opened.
[0029] See attached document Figure 3 During the pre-processing of door leaf 2, workers process the door leaf frame 201 of the specified size through steel profile cutting and welding operations. Fluid substrates such as magnesium oxychloride cement and foamed slurry are poured into the door leaf frame 201 to form a seamless fireproof and heat-insulating filler 202. After the fluid substrate solidifies, steel plate 203 is added to the door leaf frame 201 with bolt and nut kits, and a decorative layer 204, such as wood veneer, is glued to the outer surface of the steel plate 203 or fireproof paint is applied.
[0030] As an alternative embodiment, the fireproof and heat-insulating filler 202 can also be installed inside the door frame 201 by dry hanging methods such as expanded perlite board, aluminum silicate fiber felt, vermiculite board, rock wool / mineral wool board, etc., without waiting for the fluid substrate to solidify.
[0031] See attached document Figure 3 The outer side of the door leaf 2 is glued with a fourth sealing strip 207 made of EPDM rubber or neoprene rubber. The fourth sealing strips 207 of the two door leaves 2 are located on both sides of the frame 1, and are used to seal the door gap when the door leaves 2 are closed. When the two door panels 2 are closed, the two door panels 2 respectively drive the fourth sealing strip 207 to press tightly against the adjacent door panel 2 to seal the door gap, further reducing the heat loss of air conditioning or heating at the gap of the door panels 2 and improving the building's energy-saving effect.
[0032] See attached document Figure 3 The fourth sealing strip 207 increases the distance relative to the door gap when the door leaf 2 is open, so as to avoid obstructing the opening of the door leaf 2.
[0033] See attached document Figure 3Both fourth sealing strips 207 are bent, and the width of both after bending is greater than the door gap width when the door leaf 2 is closed, so that both have enough length to cover the door gap; Meanwhile, the two fourth sealing strips 207 are equipped with magnetic material inside, which is used to magnetically contact the door leaf 2, so that the two fourth sealing strips 207 can automatically seal the door gap when the door leaf 2 is closed, without the need for staff to close it by hand.
[0034] See attached document Figure 3 The door leaf 2 is equipped with a second sealing strip 205 and a third sealing strip 206 made of EPDM rubber or neoprene rubber. The second sealing strip 205 is used to seal the gap between the outside of the door leaf 2 and the inside of the frame 1, and the third sealing strip 206 is used to seal the door gap when the door leaf 2 is closed, further reducing the heat loss of air conditioning or heating at the door gap of the door leaf 2 and improving the building's energy-saving effect. Meanwhile, the third sealing strip 206 and the fourth sealing strip 207 are spaced apart to avoid obstructing the fourth sealing strip 207 from adhering tightly to the door leaf 2.
[0035] See attached document Figure 1 and Figure 2 Both door panels 2 are equipped with fireproof locks 208 by screws. When the fire door needs to be closed, the staff can lock the fireproof locks 208 with a key to lock both door panels 2 and play an anti-theft role. In addition, concealed bolts 106 can be installed at the door gaps of the two door panels 2 to further seal the door gaps and reduce the amount of smoke that can escape from the door gaps in the event of a fire.
[0036] Example 2: like Figures 4-5 As shown, a fire door is basically the same as in Embodiment 1, except that: taking a door opening in a wall with a passageway as an example (the door opening is 4200mm high and 3200mm wide), an electromagnetic door catcher is installed on the fire door. The electromagnetic door catcher includes an electromagnet body fixed to the middle of the crossbeam 102 by screws and a magnetic suction plate fixed to the top of the door leaf 2 by screws. When the electromagnet body is energized, it generates a magnetic field, and the magnetic suction plate pulls the door leaf 2 tightly against the frame 1 under the action of the magnetic field. A rubber buffer pad can also be attached to the crossbeam 102 to prevent hard collisions between the crossbeam 102 and the door leaf 2. A handle 209 is fixed to the door leaf 2 by a bolt and nut assembly. The user can pull the handle 209 to open the door leaf 2 when the electromagnet body is de-energized.
[0037] When door 2 is opened, it can be hidden in the groove of the corridor wall. The magnetic ball head is attracted to the magnetic column in the groove to prevent door 2 from shaking and hitting the electromagnet body.
[0038] Example 3: like Figures 6-7As shown, a fire door is basically the same as in Embodiment 1, except that, taking a door opening on a flat wall as an example (the door opening dimensions are 4200mm high and 3200mm wide), this embodiment further improves the fire door to address the issue of air leakage at the top of the fire door. A limiting groove 107 perpendicular to the top axis 4 is provided on the frame 1. A first sealing strip 108 made of EPDM rubber or neoprene rubber is bonded inside the limiting groove 107. The opening of the limiting groove 107 faces the opening direction of the door leaf 2. The first sealing strip 108 is used to seal the gap between the limiting groove 107 and the door leaf 2, further reducing the heat loss from air conditioning or heating at the door gap of the door leaf 2 and improving the building's energy-saving effect.
[0039] Example 4: like Figures 8-9 As shown, a fire door is basically the same as in Embodiment 1, except that: taking a door opening with a corner as an example (the door opening dimensions are 4200mm high and 3200mm wide), during on-site installation, the workers open the door leaf 2 towards the corner; To improve the airtightness of frame 1, workers fixed the aluminum alloy steel frame to the wall at the corner with expansion bolts, and then suspended stainless steel plates on the aluminum alloy steel frame with bolt and nut kits. The stainless steel plates were pressed against frame 1 to further seal the connection seam between frame 1 and the wall, reducing the heat loss from air conditioning or heating at the connection seam of frame 1 and improving the building's energy efficiency.
[0040] Example 5: like Figures 10-11 As shown, a fire door is basically the same as in Embodiment 1, except that during on-site installation, taking a door opening on a flat wall as an example (the door opening dimensions are 2700mm high and 3600mm wide), the workers bury the bottom of the frame 1 at a depth of 20mm in the ground to lower the center of gravity of the fire door and improve the reliability of the frame 1 installed in the door opening.
[0041] Example 6: like Figures 12-13 As shown, a sealing structure for a fire door is applied to the fire doors provided in Embodiments 1 to 5. Taking a doorway with a passageway as an example (the doorway dimensions are 4200mm high and 3200mm wide), during on-site installation, workers use expansion bolts to install a first steel frame 501 and a second steel frame 502 at intervals on the wall of the passageway. The first decorative panel 503 is dry-hung on the first steel frame 501 using bolt and nut kits, so that the first decorative panel 503 is tightly attached to the fire door. The second decorative panel 504 is dry-hung on the second steel frame 502 using bolt and nut kits, so that the second decorative panel 504 is tightly attached to the first decorative panel 503, forming a sealing structure. This seals the connection between the fire door and the wall in the passageway, reducing the heat loss from air conditioning or heating at the connection joint and improving the building's energy efficiency.
[0042] As an optional embodiment, the first decorative panel 503 and the second decorative panel 504 can be made of stainless steel sheet or gypsum board, which are readily available materials.
[0043] like Figure 12 and Figure 13 As shown, this embodiment addresses the connection seam between the top of the fire door and the wall. As a further improvement, during on-site installation, workers add a fourth steel frame 603 and a cantilever beam 604 to the wall at the top of the fire door using screws. A third steel frame 602 is welded to the bottom of the fourth steel frame 603. A third decorative panel 601 is bonded between the top of the frame 1 and the bottom of the third steel frame 602. The suspended third decorative panel 601 seals the connection seam between the top of the fire door and the wall, reducing heat loss from air conditioning or heating at the connection seam and improving the building's energy efficiency.
[0044] The above description is merely an optional embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention, unless otherwise specified or limited, shall be implemented according to conventional means in the art.
Claims
1. A fire door, comprising a mutually compatible frame (1) and a door leaf (2), wherein the door leaf (2) is provided with fireproof and heat-insulating filler (202), characterized in that, Also includes: The first corner (104) and the second corner (105) are welded at intervals to the inside of the frame (1); The fourth sealing strip (207) is provided at the interval of the door leaf (2) to seal the door gap when the door leaf (2) is closed; The dark shaft (3) and the top shaft (4) are vertically spaced outside the door leaf (2) along the frame (1); The dark shaft (3) and the top shaft (4) provide support for the door leaf (2) in the transverse direction of the frame (1) to straighten the door leaf (2) so that the door leaf (2) in the closed state can fit tightly against and squeeze the first corner (104) and the second corner (105). The elastic deformation of the first corner (104) and the second corner (105) is used to compensate for the wear of the gap between the frame (1) and the door leaf (2).
2. A fire door according to claim 1, characterized in that: The first corner (104) and the second corner (105) are both hollow triangles, with one corner of the hollow triangle facing and contacting the adjacent door leaf (2).
3. A fire door according to claim 1, characterized in that: The fourth sealing strip (207) is configured in two parts, and the two fourth sealing strips (207) are respectively bonded to both sides of the door leaf (2), which can seal the door gap of the door leaf (2) in the closed state from both sides; The fourth sealing strip (207) increases the distance relative to the door gap when the door leaf (2) is open, so as to avoid obstructing the opening of the door leaf (2).
4. A fire door according to claim 3, characterized in that: Both of the fourth sealing strips (207) are bent, and the width of the bend is greater than the door gap width when the door leaf (2) is closed. Among them, the two fourth sealing strips (207) are provided with magnetic material inside, which is used to magnetically contact the door leaf (2) so as to realize that the two fourth sealing strips (207) automatically close the door gap when the door leaf (2) is closed.
5. A fire door according to claim 1, characterized in that: The frame (1) is provided with a limiting groove (107) perpendicular to the top shaft (4), and a first sealing strip (108) is bonded inside the limiting groove (107). The opening of the limiting groove (107) faces the opening direction of the door leaf (2), and the first sealing strip (108) is used to close the gap between the limiting groove (107) and the door leaf (2).
6. A fire door according to claim 1, characterized in that: The door leaf (2) is provided with a second sealing strip (205) and a third sealing strip (206) installed at intervals. The second sealing strip (205) is used to seal the gap between the outside of the door leaf (2) and the inside of the frame (1). The third sealing strip (206) is used to seal the door gap when the door leaf (2) is closed. The third sealing strip (206) and the fourth sealing strip (207) are spaced apart to avoid obstructing the fourth sealing strip (207) from adhering tightly to the door leaf (2).
7. A fire door according to claim 1, characterized in that: The hidden shaft (3) is provided with embedded parts (301), a first flange (302) and a bushing (303) at intervals. The first flange (302) and bushing (303) are fixed inside the door leaf (2) by screws, and the embedded part (301) is set outside the frame (1).
8. A fire door according to claim 1, characterized in that: The top shaft (4) is connected to a second flange (401) and a third flange (402) at its two ends respectively. The second flange (401) is fixed inside the frame (1) by screws, and the third flange (402) is fixed to the top of the door leaf (2) by screws.
9. A sealing structure for a fire door, applied to a fire door according to any one of claims 1-8, characterized in that, include: The first steel frame (501) and the second steel frame (502) are set at intervals; The first decorative panel (503) is installed on the first steel frame (501) and is closely attached to the fire door; The second decorative panel (504) is installed on the second steel frame (502) and is in close contact with the first decorative panel (503).
10. The sealing structure of a fire door according to claim 9, characterized in that, Also includes: The fourth steel frame (603) and the cantilever beam (604) are fixed together with screws; The third steel frame (602) is welded to the bottom of the fourth steel frame (603); The third decorative panel (601) is bonded between the top of the frame (1) and the bottom of the third steel frame (602).