Steel heat-insulating fireproof door

Abstract

The utility model belongs to the field of fireproof door especially steel heat -proof fireproof door, it includes fireproof door frame and two steel fireproof doors, the inside of fireproof door frame is equipped with a plurality of hinge mechanism, a plurality of hinge mechanism all include door leaf hinge, a plurality of door leaf hinges are connected with corresponding steel fireproof door fixedly respectively, the inside of two steel fireproof doors is all set up to have heat -resisting chamber, and the same thick cold rolled steel plate frame is fixedly installed between the inside wall of two sides of two heat -resisting chambers. The utility model can automatically push the blocking column into the blocking hole lock dead hinge, prevent the accidental opening of steel fireproof door from mechanical structure, cut off the spread of fire to the passageway, and through the three -layer heat -insulating structure of expanded perlite plate, rock wool board and aluminium foil composite glass fibre felt, realize the function of fire flame burning, delay heat conduction and reflection and absorption heat radiation respectively, multidimensional reduce heat transfer, avoid the temperature of back fire side to exceed the standard, guarantee the evacuation safety of personnel.

Description

Technical Field

[0001] This utility model relates to the field of fire door technology, and in particular to a steel insulated fire door. Background Technology

[0002] Steel-insulated fire doors are special doors made primarily of cold-rolled steel plates as the door frame, door leaf skeleton, and panel material, filled with fire-resistant and heat-insulating materials, and equipped with fire-resistant hardware. Their core function is to simultaneously meet the requirements of fire resistance integrity and fire-resistant heat insulation within a specified time, effectively blocking the spread of fire and smoke, thus buying time for personnel evacuation and fire rescue. They are widely used in critical areas such as evacuation exits, stairwells, and pipe shafts in building fire compartments.

[0003] When a fire occurs, the high-temperature airflow generated by the fire will form a strong impact. This impact can easily push open fire doors that are in a closed state, destroy the original fire compartments, and allow flames and toxic fumes to spread rapidly to evacuation routes or other areas, directly threatening the safety of personnel evacuation and losing the core function of fire doors in blocking fire. Moreover, most existing fire doors rely on a single layer of heat insulation material, which cannot fully cope with the multiple heat transfer forms in a fire. When faced with flame burning, heat conduction and heat radiation, heat can easily penetrate the heat insulation layer, causing the temperature on the unexposed side of the door to rise rapidly. This can not only easily burn evacuees, but may also ignite combustibles on the unexposed side, expanding the scope of fire hazards.

[0004] Therefore, we propose a steel insulated fire door to solve the above problems. Utility Model Content

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A steel insulated fire door includes a fire door frame and two steel fire doors. The inner side of the fire door frame is provided with multiple hinge mechanisms, each of which includes a door panel hinge. The multiple door panel hinges are fixedly connected to the corresponding steel fire doors. The interior of each of the two steel fire doors is provided with a heat-insulating chamber. The same thick cold-rolled steel plate frame is fixedly installed between the front and rear inner walls of the two heat-insulating chambers.

[0007] Specifically, a handle is fixedly installed on one side of the steel fire door on the left side of the two steel fire doors. The outside of the handle is fixedly covered with a heat-insulating silicone sleeve to prevent the handle from becoming too hot during a fire, making it impossible for the user to touch it.

[0008] Specifically, the hinge mechanism also includes a door frame hinge, three first connecting shafts and three second connecting shafts. The door frame hinge is fixedly installed on the inner side of the fireproof door frame, three first connecting shafts are fixedly installed on one side of the door frame hinge, and three second connecting shafts are fixedly installed on one side of the door panel hinge. The three first connecting shafts and the three second connecting shafts are sequentially and rotatably connected at intervals.

[0009] Specifically, the bottom of the uppermost of the three second connecting shafts is provided with a mounting groove, and a threaded sleeve is fixedly installed on the inner side of the mounting groove. A threaded rod is threadedly connected to the inner side of the threaded sleeve.

[0010] Specifically, a main shaft is fixedly installed at the bottom end of the threaded rod. The main shaft slides through the remaining two second connecting shafts and three first connecting shafts, so as to connect the three first connecting shafts and the three second connecting shafts in series through the main shaft.

[0011] Specifically, the tops of the two second connecting shafts located in the middle and bottom of the three second connecting shafts are each provided with a locking chamber. Brass rings are fixedly installed on the inner walls of the tops of the two locking chambers. A blocking post is slidably installed on the inner side of each of the two locking chambers, with the two brass rings abutting against their respective blocking posts. Low-melting-point alloy rings are fixedly installed on the inner side of each of the two locking chambers, with the two blocking posts abutting against their respective low-melting-point alloy rings. The tops of the two first connecting shafts located in the middle and bottom of the three first connecting shafts are each provided with a blocking hole, with the two blocking posts fitting into their respective blocking holes. The main shaft slides through the two brass rings, the two blocking posts, and the two low-melting-point alloy rings, allowing the brass rings to push out the blocking posts after thermal expansion, thereby locking the hinge mechanism.

[0012] Specifically, the outer sides of the two thick cold-rolled steel plate frames are wrapped with fiberglass fireproof cloth, which makes it easy to seal the four sides of the plates and enhance the heat insulation performance.

[0013] Specifically, expanded perlite boards, rock wool boards, and aluminum foil composite fiberglass felt are fixedly installed on the inner sides of the two thick cold-rolled steel plate frames. The expanded perlite boards are located on the fire-facing side, the aluminum foil composite fiberglass felt is located on the un-fire-facing side, and the rock wool boards are located between the expanded perlite boards and the aluminum foil composite fiberglass felt. By using three different types of insulation boards, the heat resistance and insulation effect of the fire door can be greatly improved.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: through the linkage structure of the brass ring expanding when heated and the low melting point alloy ring melting, the blocking column can be automatically pushed into the blocking hole to lock the hinge, which prevents the fire door from being opened accidentally from a mechanical structure perspective, and blocks the fire spread path. Furthermore, through the three-layer heat insulation structure of expanded perlite board, rock wool board and aluminum foil composite glass fiber felt, the functions of flame burning, delaying heat conduction and reflecting and absorbing heat radiation are respectively achieved, reducing heat transfer in multiple dimensions, avoiding the temperature on the unexposed side from exceeding the standard, and ensuring the safety of personnel evacuation. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of a steel insulated fire door proposed in this utility model;

[0016] Figure 2 This is a three-dimensional structural breakdown diagram of a steel insulated fire door proposed in this utility model;

[0017] Figure 3 This is a three-dimensional structural disassembly diagram of the hinge mechanism of a steel insulated fireproof door proposed in this utility model;

[0018] Figure 4 This is a three-dimensional cross-sectional view of a steel fire door for which this utility model is proposed.

[0019] Figure 5 This utility model presents a three-dimensional structural breakdown diagram of a steel insulated fire door, comprising fiberglass fireproof cloth, a thick cold-rolled steel plate frame, aluminum foil composite fiberglass felt, rock wool board, and expanded perlite board.

[0020] In the diagram: 1. Fire door frame; 2. Steel fire door; 3. Handle; 4. Thermal insulation silicone sleeve; 5. Door frame hinge; 6. First connecting shaft; 7. Blocking hole; 8. Door panel hinge; 9. Second connecting shaft; 10. Threaded sleeve; 11. Threaded rod; 12. Main shaft; 13. Low melting point alloy ring; 14. Blocking post; 15. Brass ring; 16. Fiberglass fireproof cloth; 17. Thick cold-rolled steel plate frame; 18. Aluminum foil composite fiberglass felt; 19. Rock wool board; 20. Expanded perlite board. Detailed Implementation

[0021] Reference Figure 1-5 A steel insulated fire door includes a fire door frame 1 and two steel fire doors 2. The inner side of the fire door frame 1 is provided with multiple hinge mechanisms, each of which includes a door panel hinge 8. The multiple door panel hinges 8 are fixedly connected to the corresponding steel fire doors 2. The interior of each of the two steel fire doors 2 is provided with a heat-insulating chamber. The same thick cold-rolled steel plate frame 17 is fixedly installed between the inner walls of the front and rear sides of the two heat-insulating chambers.

[0022] In this embodiment, a handle 3 is fixedly installed on one side of the steel fire door 2 located on the left side of the two steel fire doors 2. A heat-insulating silicone sleeve 4 is fixedly fitted on the outside of the handle 3 to prevent the handle 3 from becoming too hot during a fire, making it impossible for the user to touch it.

[0023] In this embodiment, the hinge mechanism also includes a door frame hinge 5, three first connecting shafts 6 and three second connecting shafts 9. The door frame hinge 5 is fixedly installed on the inner side of the fire door frame 1. Three first connecting shafts 6 are fixedly installed on one side of the door frame hinge 5. Three second connecting shafts 9 are fixedly installed on one side of the door panel hinge 8. The three first connecting shafts 6 and the three second connecting shafts 9 are sequentially and rotatably connected at intervals.

[0024] In this embodiment, the bottom of the uppermost second connecting shaft 9 among the three second connecting shafts 9 is provided with an installation groove, and a threaded sleeve 10 is fixedly installed on the inner side of the installation groove. A threaded rod 11 is threadedly connected to the inner side of the threaded sleeve 10.

[0025] In this embodiment, a main shaft 12 is fixedly installed at the bottom end of the threaded rod 11. The main shaft 12 slides through the remaining two second connecting shafts 9 and three first connecting shafts 6, so as to connect the three first connecting shafts 6 and the three second connecting shafts 9 in series through the main shaft 12.

[0026] In this embodiment, the tops of the two second connecting shafts 9 located in the middle and bottom of the three second connecting shafts 9 are provided with locking chambers. Brass rings 15 are fixedly installed on the inner walls of the tops of the two locking chambers. Blocking posts 14 are slidably installed on the inner sides of the two locking chambers. The two brass rings 15 abut against the corresponding blocking posts 14. Low-melting-point alloy rings 13 are fixedly installed on the inner sides of the two locking chambers. The two blocking posts 14 abut against the corresponding low-melting-point alloy rings 13. The tops of the two first connecting shafts 6 located in the middle and bottom of the three first connecting shafts 6 are provided with blocking holes 7. The two blocking posts 14 are adapted to the corresponding blocking holes 7. The main shaft 12 slides through the two brass rings 15, the two blocking posts 14 and the two low-melting-point alloy rings 13, so that the brass rings 15 can push out the blocking posts 14 after being heated and expanded, thereby locking the hinge mechanism.

[0027] In this embodiment, the outer sides of the two thick cold-rolled steel plate frames 17 are wrapped with fiberglass fireproof cloth 16, which facilitates the sealing of the four sides of the plate and enhances the heat insulation performance.

[0028] In this embodiment, expanded perlite board 20, rock wool board 19 and aluminum foil composite fiberglass felt 18 are fixedly installed on the inner sides of the two thick cold-rolled steel plate frames 17. The expanded perlite board 20 is located on the fire-facing side, the aluminum foil composite fiberglass felt 18 is located on the unfire-facing side, and the rock wool board 19 is located between the expanded perlite board 20 and the aluminum foil composite fiberglass felt 18. By using three different types of heat insulation boards, the heat resistance and heat insulation effect of the fire door can be greatly improved.

[0029] Working Principle: When a fire occurs and is in the fire spread stage, the ambient temperature rises rapidly. Both steel fire doors 2 are in a closed state. As the ambient temperature rises, the brass ring 15 located inside the locking chamber is heated, its atomic thermal motion intensifies, and the spacing increases, causing it to expand while maintaining rigidity. The expanded brass ring 15 compresses the blocking post 14. Although the low-melting-point alloy ring 13 can support the blocking post 14 under normal conditions, during a fire, the increased ambient temperature causes it to reach its melting point, and the alloy melts, losing its limiting effect. At this time, the brass ring 15 compresses the blocking post 14, causing it to move down into the blocking hole 7, thus locking the hinge mechanism and preventing airflow from causing the steel fire door 2 to open. When the fire temperature rises, its heat is blocked by the steel fire door 2, and the high temperature first contacts the expanded perlite plate 20 on the fire-facing side. Its inherent high-temperature properties can directly block the burning of flames. At the same time, the board expands slightly when exposed to fire, filling the gap between the steel fire door 2 and the fire door frame 1, reducing heat penetration. The heat that is not completely blocked is conducted to the rock wool board 19. The rock wool board 19 slows down heat conduction through its own fibrous porous structure, blocking the heat transfer path. A small amount of heat radiation that penetrates the rock wool board 19 is reflected by the aluminum foil composite glass fiber felt 18. The remaining weak heat is absorbed by the aluminum foil composite glass fiber felt 18, thereby reducing the temperature on the unexposed side of the steel fire door 2. Furthermore, the protective shell composed of the glass fiber fireproof cloth 16 and the thick cold-rolled steel plate frame 17, which are set on the outer layer of the expanded perlite board 20, rock wool board 19 and aluminum foil composite glass fiber felt 18, can effectively reduce the moisture aging of the core material, while avoiding impact damage to the core material, ensuring the stable functioning of the overall heat insulation structure.

[0030] The technological advancements of this invention compared to existing technologies are as follows: it can automatically push the blocking column 14 into the blocking hole 7 to lock the hinge, preventing the steel fire door 2 from being opened accidentally from a mechanical structure perspective, blocking the spread of fire to the passage, and through the three-layer heat insulation structure of expanded perlite board 20, rock wool board 19 and aluminum foil composite glass fiber felt 18, it respectively achieves the functions of preventing flame burning, delaying heat conduction and reflecting and absorbing heat radiation, reducing heat transfer in multiple dimensions, avoiding excessive temperature on the unexposed side, and ensuring the safety of personnel evacuation.

Claims

1. A steel insulated fireproof door, characterized in that, It includes a fireproof door frame (1) and two steel fireproof doors (2). The inner side of the fireproof door frame (1) is provided with multiple hinge mechanisms, each of which includes a door panel hinge (8). The multiple door panel hinges (8) are respectively fixedly connected to the corresponding steel fireproof doors (2). Both steel fire doors (2) have heat-insulating chambers inside, and the same thick cold-rolled steel plate frame (17) is fixedly installed between the inner walls of the front and rear sides of the two heat-insulating chambers.

2. A steel insulated fireproof door according to claim 1, characterized in that, A handle (3) is fixedly installed on one side of the steel fire door (2) located on the left side of the two steel fire doors (2), and a heat-insulating silicone sleeve (4) is fixedly fitted on the outside of the handle (3).

3. A steel insulated fire door according to claim 1, characterized in that, The hinge mechanism also includes a door frame hinge (5), three first connecting shafts (6) and three second connecting shafts (9). The door frame hinge (5) is fixedly installed on the inner side of the fireproof door frame (1). Three first connecting shafts (6) are fixedly installed on one side of the door frame hinge (5). Three second connecting shafts (9) are fixedly installed on one side of the door panel hinge (8). The three first connecting shafts (6) and the three second connecting shafts (9) are sequentially and rotatably connected at intervals.

4. A steel insulated fireproof door according to claim 3, characterized in that, The bottom of the uppermost second connecting shaft (9) among the three second connecting shafts (9) is provided with an installation groove, and a threaded sleeve (10) is fixedly installed on the inner side of the installation groove. A threaded rod (11) is threadedly connected to the inner side of the threaded sleeve (10).

5. A steel insulated fireproof door according to claim 4, characterized in that, The bottom end of the threaded rod (11) is fixedly mounted with a main shaft (12), which slides through the remaining two second connecting shafts (9) and three first connecting shafts (6).

6. A steel insulated fire door according to claim 5, characterized in that, The top of the two second connecting shafts (9) located in the middle and bottom of the three second connecting shafts (9) is provided with locking chambers. Brass rings (15) are fixedly installed on the inner wall of the top of the two locking chambers. Blocking posts (14) are slidably installed on the inner side of the two locking chambers. The two brass rings (15) abut against the corresponding blocking posts (14). Low melting point alloy rings (13) are fixedly installed on the inner side of the two locking chambers. The two blocking posts (14) abut against the corresponding low melting point alloy rings (13). The top of the two first connecting shafts (6) located in the middle and bottom of the three first connecting shafts (6) is provided with blocking holes (7). The two blocking posts (14) are adapted to the corresponding blocking holes (7). The main shaft (12) slides through the two brass rings (15), the two blocking posts (14) and the two low melting point alloy rings (13).

7. A steel insulated fireproof door according to claim 1, characterized in that, The outer sides of the two thick cold-rolled steel plate frames (17) are wrapped with fiberglass fireproof cloth (16).

8. A steel insulated fire door according to claim 7, characterized in that, Expanded perlite board (20), rock wool board (19) and aluminum foil composite glass fiber felt (18) are fixedly installed on the inner sides of the two thick cold-rolled steel plate frames (17). The expanded perlite board (20) is located on the fire-facing side, the aluminum foil composite glass fiber felt (18) is located on the fire-repellent side, and the rock wool board (19) is located between the expanded perlite board (20) and the aluminum foil composite glass fiber felt (18).

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