Passive fireproof door

Abstract

The utility model relates to the technical field of passive fireproof doors, in particular to a passive fireproof door which comprises a fireproof door body, one side of the fireproof door body is fixedly connected with a fireproof frame, the fireproof frame comprises two first iron sheets, two second iron sheets are fixedly connected between the two ends of the two first iron sheets, and the two first iron sheets are fixedly connected with the two second iron sheets. First fireproof wood and second fireproof wood are fixedly connected to the first iron sheets and the second iron sheets correspondingly, and gap grooves are formed in the sides, facing the first iron sheets and the second iron sheets, of the first fireproof wood and the second fireproof wood correspondingly. By means of the technical scheme, heat conduction is reduced, indoor and outdoor heat exchange is reduced, and air tightness and heat preservation performance are improved, so that effective fireproof time is prolonged for personnel, the overall strength of the fireproof door is improved, the service life of the fireproof door is prolonged, meanwhile, a channel can be rapidly opened after a fire is weakened, and the fireproof door is safe and reliable. Therefore, the life safety of personnel is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of passive fire doors, and in particular to a passive fire door. Background Art

[0002] The invention of passive fire doors fills the gap in my country's lack of specialized fire doors for passive houses. Passive houses are a highly efficient form of construction that has strict requirements for their building materials and components, particularly in terms of thermal insulation, sound insulation, airtightness, anti-condensation, and fire resistance. Ordinary building fire doors currently available on the traditional market do not meet the standards of passive houses and are unable to provide the comprehensive protection required for such high-performance buildings. By developing passive fire doors to ensure that they meet the requirements of passive houses in all performance indicators, this new type of door not only possesses excellent fire resistance but also excellent thermal insulation and sound insulation properties. This door is designed with the stringent requirements of passive houses in mind, enabling it to block heat transfer and prevent condensation while maintaining a good seal to ensure a comfortable indoor climate.

[0003] Fire doors in the existing technology have the following technical problems: traditional fire doors have high heat conduction efficiency in high temperature environments, resulting in rapid changes in indoor and outdoor temperatures, which may not be able to effectively prevent the spread of fire. At the same time, some fire doors fail to effectively isolate heat exchange, causing energy loss in heating or air conditioning. Secondly, in order to ensure the thermal insulation of fire doors, some fire doors will use some high-temperature resistant insulation materials as door cores, such as rock wool (mineral wool), glass wool, ceramic fiber, polyurethane (PU) foam, perlite and aerogel, etc. This method improves the thermal insulation effect of fire doors through the thermal insulation effect of the insulation material itself, but it will reduce the strength of the fire door itself and reduce the fire door's resistance to impact force, thereby reducing the service life of the fire door. Utility Model Content

[0004] The utility model proposes a passive fire door, which reduces heat conduction, reduces heat exchange between indoor and outdoor, improves air tightness and thermal insulation, thereby increasing the effective fire protection time for personnel, and improves the overall strength of the fire door, that is, increases the service life of the fire door. At the same time, the fire door can be quickly opened after the fire is weakened, thereby ensuring the safety of personnel.

[0005] The technical solution of the utility model is as follows:

[0006] A passive fire door, comprising a fire door body;

[0007] The fire door body includes a fireproof frame fixedly connected to one side, and the fireproof frame includes two first iron sheets, and two second iron sheets are fixedly connected between the two ends of the two first iron sheets;

[0008] A first fireproof wood and a second fireproof wood are fixedly connected to each first iron sheet and each second iron sheet respectively, and a gap groove is formed on the side of each first fireproof wood and each second fireproof wood facing the first iron sheet and each second iron sheet;

[0009] The fireproof frame is fixedly connected with a first insulation board, a second insulation board and a third insulation board in sequence;

[0010] Insulation cloth is fixedly sewn between the fire door body and the fire frame to improve the insulation effect;

[0011] An outer covering plate connected to a lock core is fixedly connected to the side of the fire door body away from the fire frame, and a support component for improving the strength of the fire door body is connected between the outer covering plate and the fire door body.

[0012] Furthermore, the support assembly includes a first door core, and the first door core is slidably connected to the second door core on both sides;

[0013] Two transmission blocks are slidably connected to the first door core, and a door-breaking assembly is connected between the two transmission blocks to destroy the connection between the first door core and the two second door cores;

[0014] Each transmission block is hinged to two linkage plates on one side facing the first door core, and each linkage plate is hinged to a blocking block on one end away from the transmission block, and each blocking block is slidably connected between the first door cores;

[0015] Each of the second door cores is tightly abutted against two adjacent locking blocks;

[0016] Each second door core is abutted against a reset plate on the side away from the first door core, and each reset plate is fixedly connected to two reset columns on the side away from the second door core. Each reset column is slidably abutted against the inner wall of the fire door body, and each reset column is covered with a reset spring, and the two ends of each reset spring are respectively abutted against the fire door body and the reset plate.

[0017] Furthermore, one end of each of the positioning blocks away from the transmission block protrudes from the side of the first door core, and two positioning grooves are respectively provided on the inner walls on both sides of the fire door body, and each positioning block abuts against the inner wall of each positioning groove.

[0018] Furthermore, the door-breaking assembly includes a door-breaking plate, which is slidably connected between the outer covering plates, a door-breaking cone fixedly connected to the side of the door-breaking plate facing the first door core, a support sleeve slidably connected to the outer side of the door-breaking cone, and the support sleeve fixedly connected between the first door core and the door-breaking plate;

[0019] Two first linkage blocks are hinged on one side of the door-breaking plate toward the first door core. One end of each of the first linkage blocks away from the door-breaking plate is hinged on a second linkage block. Each of the second linkage blocks is hinged to an adjacent transmission block.

[0020] Furthermore, each of the second door cores is provided with two receiving grooves, and a plurality of receiving blocks are fixedly connected to the outer cover plate on the side facing the two second door cores, and each of the receiving blocks abuts against the inner wall of each receiving groove.

[0021] Furthermore, the inner walls on both sides of the fire door body are provided with a first coupling groove, and each of the second door cores is provided with a second coupling groove, and the inner wall of each of the second coupling grooves abuts against the inner wall of each of the first coupling grooves;

[0022] Each of the reset posts is slidably connected to the inner wall of the first coupling groove.

[0023] Furthermore, sealing tape is fixedly connected between each of the first fireproof wood and each of the second fireproof wood and each of the first iron sheet and each of the second iron sheet.

[0024] The beneficial effects of the utility model are:

[0025] The door frame is connected as a whole, and a first iron sheet and a second iron sheet are built in sequence, so that the first iron sheet and the second iron sheet are abutted by fireproof wood to reduce the temperature conduction effect, and the first iron sheet and the second iron sheet are facing inward by opening a gap groove, and the connection relationship with the first insulation board, the second insulation board and the third insulation board is a local point connection, and the rest of the connection is disconnected, which further reduces the heat conduction. Preferably, the materials of the first insulation board, the second insulation board and the third insulation board are aerogel, perlite and aerogel respectively, because aerogel is a soft material relative to perlite, which can protect the perlite sandwiched in the middle, and both aerogel and perlite have excellent thermal insulation performance and compressive strength. These high-insulation refractory materials with smaller thermal conductivity coefficients than other materials reduce the exchange of indoor and outdoor heat;

[0026] The support assembly improves the overall strength of the fire door body, effectively dispersing external forces such as impact or pressure, and reducing the risk of door deformation. This enhanced structural integrity ensures that the door maintains its shape and function as much as possible in the event of a fire, preventing the spread of fire, thereby increasing effective fire prevention time for personnel and buying valuable time for evacuation and rescue. Because the support assembly increases the overall strength of the fire door, it reduces the wear and damage caused by daily use and external environmental constraints, significantly extending the service life of the fire door. This means that some expenses can also be saved in maintenance and replacement costs. In addition, when evacuation is required and the fire door body cannot be opened due to deformation caused by high temperature, firefighters can quickly open a passage in the fire door body for rapid evacuation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0028] Figure 1 This is a schematic diagram of the positive axis explosion of the utility model;

[0029] Figure 2 This is a schematic diagram of the partial explosion of the utility model Figure 1 ;

[0030] Figure 3 This is a schematic diagram of the partial explosion of the utility model Figure 2 ;

[0031] Figure 4 for Figure 3 A is an enlarged schematic diagram;

[0032] Figure 5 This is a schematic diagram of the partial explosion of the utility model Figure 3 ;

[0033] Figure 6 This is a schematic diagram of the partial explosion of the utility model Figure 4 ;

[0034] Figure 7 This is an enlarged schematic diagram of the utility model Figure 1 ;

[0035] Figure 8 for Figure 7 A magnified schematic diagram of middle B;

[0036] Figure 9 This is an enlarged schematic diagram of the utility model Figure 2 ;

[0037] Figure 10 It is a partially enlarged schematic diagram of the utility model.

[0038] In the figure: 11. Fire door body; 12. Fireproof frame; 13. First iron sheet; 14. Second iron sheet; 15. First fireproof wood; 16. Second fireproof wood; 17. Gap groove; 181. First insulation board; 182. Second insulation board; 183. Third insulation board; 19. Insulation cloth; 110. Covering board; 111. Positioning groove; 112. First connecting groove; 21. First door core; 22. Second door core; 221. Receiver groove; 222. Receiver block; 223. Second connecting groove; 23. Transmission block; 24. Linkage plate; 25. Positioning block; 26. Reset plate; 27. Reset column; 28. Reset spring; 31. Door-breaking plate; 32. Door-breaking cone; 33. Support sleeve; 34. First linkage block; 35. Second linkage block. DETAILED DESCRIPTION

[0039] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] Example

[0041] like Figures 1 to 10 As shown, this embodiment proposes a passive fire door, including a fire door body 11;

[0042] One side of the fire door body 11 is fixedly connected to the fireproof frame 12. The fireproof frame 12 includes two first iron sheets 13. Two second iron sheets 14 are fixedly connected between the two ends of the first iron sheets 13.

[0043] Each first iron sheet 13 and each second iron sheet 14 is fixedly connected to a first fireproof wood 15 and a second fireproof wood 16 respectively, and a gap groove 17 is provided on each of the first iron sheet 13 and the second iron sheet 14;

[0044] The door frame is connected as a whole, and the first iron sheet 13 and the second iron sheet 14 are built in sequence. The first iron sheet 13 and the second iron sheet 14 are abutted by fireproof wood to reduce the heat conduction effect. In addition, by opening the gap groove 17, the first iron sheet 13 and the second iron sheet 14 are facing inward. The connection relationship with the first insulation board 181, the second insulation board 182 and the third insulation board 183 is a partial point connection, and the rest are all disconnected, which further reduces heat conduction.

[0045] The first insulation board 181, the second insulation board 182 and the third insulation board 183 are fixedly connected in sequence in the fireproof frame 12;

[0046] Preferably, the materials of the first insulation board 181, the second insulation board 182, and the third insulation board 183 are aerogel, perlite, and aerogel, respectively. This is because aerogel is a soft material compared to perlite and can protect the perlite sandwiched between them. In addition, both aerogel and perlite have excellent thermal insulation properties and compressive strength. These high-insulation refractory materials with lower thermal conductivity than other materials can reduce the exchange of heat between indoor and outdoor.

[0047] Insulation fabric 19 between the fire door body 11 and the fireproof frame 12 for improving the insulation effect;

[0048] The heat insulation cloth 19 further isolates the heat exchange between the indoor and outdoor areas, further achieving a heat insulation effect, reducing the impact of heat generated on one side of the fire door body 11 on the temperature on the other side of the fire door body 11, improving heat preservation, and thus improving user safety;

[0049] The side of the fire door body 11 away from the fire frame 12 is fixedly connected to the outer covering plate 110 connected to the lock core. Preferably, glue is used to fix the outer covering plate 110 and the fire door body 11. Because the glue can ensure the connection strength between the outer covering plate 110 and the fire door body 11 at room temperature, and then at high temperature, the glue gradually softens, making it easier for users or firefighters to remove the outer covering plate 110. The support component that improves the strength of the fire door body 11 is connected between the outer covering plate 110 and the fire door body 11;

[0050] The support assembly improves the overall strength of the fire door body 11, effectively dispersing external forces, such as impact or pressure, and reducing the risk of door deformation. This enhanced structural integrity ensures that the door maintains its shape and function as much as possible in the event of a fire, preventing the spread of fire, thereby increasing effective fire prevention time and buying valuable time for evacuation and rescue. Because the support assembly increases the overall strength of the fire door, it reduces wear and damage caused by daily use and external environmental constraints, significantly extending the service life of the fire door. This means that some expenses can also be saved in maintenance and replacement costs. In addition, when evacuation is required and the fire door body 11 is deformed due to high temperature and cannot be opened, firefighters can quickly open a passage in the fire door body 11 for rapid evacuation.

[0051] like Figures 6 to 10 As shown, the support assembly includes a first door core 21, and second door cores 22 are slidably connected on both sides of the first door core 21;

[0052] The two transmission blocks 23 are both slidably connected to the first door core 21 , and the door breaking assembly for destroying the connection between the first door core 21 and the two second door cores 22 is connected between the two transmission blocks 23 ;

[0053] Each transmission block 23 is hinged to two linkage plates 24 on the side facing the first door core 21, and one end of each linkage plate 24 away from the transmission block 23 is hinged to a positioning block 25, and each positioning block 25 is slidably connected between the first door core 21;

[0054] Each second door core 22 is in close contact with two adjacent latching blocks 25;

[0055] The side of each second door core 22 away from the first door core 21 abuts against the reset plate 26. The side of each reset plate 26 away from the second door core 22 is fixedly connected to two reset posts 27. Each reset post 27 is in sliding abutment with the inner wall of the fire door body 11. Each reset spring 28 is sleeved on each reset post 27. The two ends of each reset spring 28 abut against the fire door body 11 and the reset plate 26 respectively.

[0056] The first door core 21 and the second door core 22 abutting on both sides are limited and clamped by the locking block 25, so that the first door core 21 and the two second door cores 22 are completely clamped in the fire door body 11, thereby completing the supporting function of the fire door body 11 and improving the strength of the fire door body 11 itself. Then, after the locking block 25 is disengaged and the abutting effect of the locking block 25 is lost, the second door cores 22 on both sides slide toward the first door core 21 under the action of the reset spring 28, so that the second door core 22 is disengaged from the position where it is clamped with the fire door body 11, so that the second door core 22 can be quickly disassembled.

[0057] like Figures 6 to 10 As shown, one end of each positioning block 25 away from the transmission block 23 protrudes from the side of the first door core 21, and two positioning grooves 111 are formed on the inner walls on both sides of the fire door body 11, and each positioning block 25 abuts against the inner wall of each positioning groove 111;

[0058] The two blocking blocks 25 under the action of the support sleeve 33 can abut against the inner walls of the adjacent positioning grooves 111, so that the first door core 21 can be clamped to the fire door body 11, thereby improving the connection strength between the fire door body 11 and the first door core 21, and the inclined surface on the upper side of the blocking block 25 abuts against the adjacent second door core 22, so that the second door core 22 can maintain a fixed clamping effect when the blocking block 25 is not moving, thereby making the first door core 21 and the second door core 22 fixed in the fire door body 11 able to be stably clamped. At the same time, it shows that it is only necessary to adjust the blocking block 25 so that the blocking blocks 25 on both sides are disengaged from the adjacent positioning grooves 111, so that the first door core 21 and the second door core 22 can be quickly removed, simplifying the disassembly and assembly process of the first door core 21 and the second door core 22, improving the strength of the fire door body 11, and reducing the production cost.

[0059] like Figures 6 to 10 As shown, the door breaking assembly includes a door breaking plate 31, which is slidably connected between the outer covering plates 110, and the door breaking plate 31 is fixedly connected to a door breaking cone 32 on the side facing the first door core 21. The door breaking cone 32 is slidably connected to a support sleeve 33, and the support sleeve 33 is fixedly connected between the first door core 21 and the door breaking plate 31;

[0060] The door-breaking plate 31 is hinged to two first linkage blocks 34 on the side facing the first door core 21 . The end of each first linkage block 34 away from the door-breaking plate 31 is hinged to a second linkage block 35 . Each second linkage block 35 is hinged to the adjacent transmission block 23 .

[0061] Preferably, the support sleeve 33 is made of glass, because glass is relatively hard at room temperature and has sufficient support to prevent the second door cores 22 on both sides from falling out. However, under high temperature, the support sleeve 33 made of glass will gradually soften, and then when force is applied to one side of the door-breaking plate 31, the support sleeve 33 can be easily broken, thereby allowing the second door cores 22 on both sides to be connected to the outer covering plate 110, and the door-breaking cone 32 can pierce the insulation skin 19 under the joint action of the door-breaking plate 31, so that after the user removes the outer covering plate 110, an opening that can pass through the fire door body 11 can be created in the fire door body 11 more quickly, allowing users or firefighters to pass through more quickly.

[0062] like Figures 6 to 10 As shown, two receiving grooves 221 are provided on the second door core 22, and the outer cover plate 110 is fixedly connected to a plurality of receiving blocks 222 on one side facing the two second door cores 22, and each receiving block 222 abuts against the inner wall of each receiving groove 221;

[0063] When the two second door cores 22 are not abutted by the locking blocks 25, the two second door cores 22 will be displaced under the action of the adjacent reset plates 26, thereby causing the receiving grooves 221 to be locked with the adjacent receiving blocks 222. Then, the first door core 21 and the two second door cores 22 used to increase the strength of the fire door body 11 can be removed simultaneously by removing the outer covering plate 110. After the fire is weakened, when the fire door body 11 and the lock core cannot be opened due to the high temperature, the user or firefighters can remove the fire door body 11 more quickly and conveniently, thereby improving the user's efficiency in breaking the fire door body 11.

[0064] like Figures 3 and 4 and Figures 6 to 10 As shown, the two first coupling grooves 112 are both provided on the inner walls on both sides of the fire door body 11, and the second coupling grooves 223 are provided on the second door cores 22, and the inner walls of the second coupling grooves 223 abut against the inner walls of the first coupling grooves 112;

[0065] Each reset post 27 is slidably connected to the inner wall of the first coupling groove 112;

[0066] The two second door cores 22 are tightly abutted against the fire door body 11 through the abutment of the inner walls of the second connecting grooves 223 and the inner walls of the first connecting grooves 112, so that the two second door cores 22 can form a whole with the fire door body 11, thereby improving the connection relationship between the two second door cores 22 and the fire door body 11.

[0067] like Figures 1 to 5 As shown, preferably, a sealing tape is fixedly connected between each first fireproof wood 15 and each first iron sheet 13 or each second fireproof wood 16 and each second iron sheet 14;

[0068] When the first iron sheet 13 is threadedly connected to the first fireproof wood 15, with the help of the sealing tape, the screws will not cause large cracks to appear on the contact surface of the first fireproof wood 15 or the second fireproof wood 16. At the same time, the sealing tape makes the connection between the first iron sheet 13 and the first fireproof wood 15 or the second fireproof wood 16 and the second iron sheet 14 tighter, reduces the gap, improves the air tightness, and also improves the sound insulation effect, reduces the heat dissipation of the gap, and improves the thermal insulation effect.

[0069] The principle of this embodiment is:

[0070] When inserting the first fireproof wood 15 into the first iron sheet 13, pad it with sealing tape, and then fix the first fireproof wood 15 on the other side of the first iron sheet 13 with screws, and then assemble the first iron sheet 13 and the second iron sheet 14 in this way to form a fireproof frame 12, and then fix the first insulation board 181, the second insulation board 182 and the third insulation board 183 in the fireproof frame 12 in sequence, and then fix the fire door body 11 on one side of the fireproof frame 12, and then fix the support assembly and the outer cover plate 110 with the lock core in the fireproof frame 12, and finally fix the support assembly and the outer cover plate 110 with the lock core on the side of the fireproof frame 12 away from the fireproof frame 12;

[0071] When a fire occurs, the point-to-surface connection between the first iron sheet 13 and the second iron sheet 14 and the fire door body 11 can reduce heat conductivity, and the heat insulation material of the first insulation board 181, the second insulation board 182, and the third insulation board 183 can further improve the high temperature resistance of the fire door body 11, thereby improving the heat insulation performance of the fire door body 11.

[0072] When the fire subsides and people need to evacuate through fire prevention, and the fire door has been deformed due to high temperature and the lock core has been damaged and difficult to remove, when a force is applied to one side of the breaking plate 31, the support sleeve 33 can be easily broken, thereby making the second door core 22 on both sides engage with the outer covering plate 110, and the breaking cone 32 can pierce the insulation skin 19 under the joint action of the breaking plate 31, so that after the user removes the outer covering plate 110, an opening that can pass through the fire door body 11 can be created more quickly in the fire door body 11, allowing users or firefighters to pass through more quickly;

[0073] The support sleeve 33 is made of glass because glass is relatively hard at room temperature and has sufficient support to prevent the second door cores 22 on both sides from falling out. However, under high temperature, the support sleeve 33 made of glass will gradually soften, so that the support sleeve 33 can be broken by applying only a small force, thereby losing its supporting and limiting effect on the second door cores 22 on both sides and the first door core 21 therebetween.

[0074] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A passive fire door, comprising a fire door body (11), characterized in that ； The fire door body (11) includes a fireproof frame (12) fixedly connected to one side, the fireproof frame (12) includes two first iron sheets (13), and two second iron sheets (14) are fixedly connected between the two ends of the two first iron sheets (13); A first fireproof wood (15) and a second fireproof wood (16) are fixedly connected to each first iron sheet (13) and each second iron sheet (14), and a gap groove (17) is provided on one side of each first fireproof wood (15) and each second fireproof wood (16) facing each first iron sheet (13) and each second iron sheet (14); A first insulation board (181), a second insulation board (182) and a third insulation board (183) are fixedly connected in sequence in the fireproof frame (12); A heat-insulating cloth (19) for improving the heat-insulating effect is fixedly sewn between the fire door body (11) and the fire frame (12); An outer covering plate (110) connected to a lock core is fixedly connected to the side of the fire door body (11) away from the fireproof frame (12), and a support component for improving the strength of the fire door body (11) is connected between the outer covering plate (110) and the fire door body (11).

2. The passive fire door according to claim 1, characterized in that: The support assembly comprises a first door core (21), and second door cores (22) are slidably connected to both sides of the first door core (21); Two transmission blocks (23) are slidably connected to the first door core (21), and a door breaking assembly for breaking the connection between the first door core (21) and the two second door cores (22) is connected between the two transmission blocks (23); Each transmission block (23) is hingedly connected to two linkage plates (24) on one side facing the first door core (21); each linkage plate (24) is hingedly connected to a positioning block (25) at one end away from the transmission block (23); each positioning block (25) is slidably connected between the first door core (21); Each of the second door cores (22) is in close contact with two adjacent latching blocks (25); Each second door core (22) is in contact with a reset plate (26) on one side away from the first door core (21); each reset plate (26) is fixedly connected to two reset columns (27) on one side away from the second door core (22); each reset column (27) is in sliding contact with the inner wall of the fire door body (11); each reset column (27) is sleeved with a reset spring (28); and each end of the reset spring (28) is in contact with the fire door body (11) and the reset plate (26) respectively.

3. The passive fire door according to claim 2, characterized in that: One end of each of the positioning blocks (25) away from the transmission block (23) protrudes from the side of the first door core (21), and two positioning grooves (111) are respectively provided on the inner walls on both sides of the fire door body (11), and each positioning block (25) abuts against the inner wall of each positioning groove (111).

4. The passive fire door according to claim 2, characterized in that: The door-breaking assembly comprises a door-breaking plate (31), the door-breaking plate (31) is slidably connected between the outer covering plates (110), a door-breaking cone (32) is fixedly connected to the side of the door-breaking plate (31) facing the first door core (21), a support sleeve (33) is slidably connected to the outer side of the door-breaking cone (32), and the support sleeve (33) is fixedly connected between the first door core (21) and the door-breaking plate (31); Two first linkage blocks (34) are hingedly connected to the side of the broken door plate (31) facing the first door core (21), and each first linkage block (34) is hingedly connected to a second linkage block (35) at one end away from the broken door plate (31), and each second linkage block (35) is hingedly connected to an adjacent transmission block (23).

5. The passive fire door according to claim 2, characterized in that: Two receiving grooves (221) are provided on each of the second door cores (22); a plurality of receiving blocks (222) are fixedly connected to the outer covering plate (110) on one side facing the two second door cores (22); and each receiving block (222) abuts against the inner wall of each receiving groove (221).

6. The passive fire door according to claim 2, characterized in that: The inner walls of both sides of the fire door body (11) are each provided with a first coupling groove (112), and each of the second door cores (22) is provided with a second coupling groove (223), and the inner wall of each of the second coupling grooves (223) abuts against the inner wall of each of the first coupling grooves (112); Each of the reset columns (27) is slidably connected to the inner wall of the first coupling groove (112).

7. The passive fire door according to claim 1, characterized in that: Sealing tape is fixedly connected between each of the first fireproof wood (15) and each of the second fireproof wood (16) and each of the first iron sheets (13) and each of the second iron sheets (14).

Images