A fire door

Abstract

The present invention relates to the technical field of door structures, and particularly to a fire door. A first water pipe is embedded in the upper frame of the door frame, and a second water pipe is arranged in the cavity inside the door leaf. When the door leaf is closed, the first water pipe and the second water pipe are coaxially butted. By arranging first sealing rubber strips, second sealing rubber strips and third sealing rubber strips with specific structures at specific positions of the door leaf, when a fire occurs, a three-level sealing of the sealing rubber strips and a two-level water seal are formed between the door seams, and the inside of the door leaf can be cooled by water flow; the above structure has the advantage of long service life, realizes multi-level sealing of the door seams during a fire, and the water flow can cool the inside of the door leaf as well as the door leaf and the door frame, so that when a fire is encountered, a stable fire prevention effect can be ensured for a long time, and the spread of fire and smoke can be inhibited.

Description

Technical Field

[0001] The invention relates to the technical field of door structures, and in particular to a fireproof door. Background Art

[0002] Fire doors have been widely used in the entrances and exits of floor fire passages. Their function is that when a fire occurs on a certain floor, the fire doors can prevent the fire from spreading to the upper and lower floors, causing the fire to expand over a large area. In the existing fire door structure, on the one hand, a core board of fire-proof material is filled in the door leaf, and on the other hand, a circle of sealing strips is attached to the edge of the door leaf or the door frame. Most of these sealing strips are expanding sealing strips, that is, expanded graphite is filled in the sealing strips. When encountering a fire, the expanding sealing strips expand when encountering high temperature, completely blocking the gap between the door leaf and the door frame, thereby preventing smoke from spreading through the door gap.

[0003] However, the method of sealing the gap between the door leaf and the door frame only by using the expansion sealant strip has the following problems: 1. It is difficult to ensure that the expansion sealant strips at all positions are evenly heated and expanded. Therefore, when a local fire occurs, smoke will diffuse from the door gap where the sealant strips have not expanded, and the sealing effect is poor; 2. Since the sealant strips are usually glued to the door frame or door leaf, and most fire doors are normally closed fire doors, after people enter and exit the fire door, it will automatically close under the action of the door closer. When closing, the door leaf and the sealant strip repeatedly contact and separate. After long-term use, the sealant strip will be partially deformed and debonded, resulting in a decrease in the sealing performance of the fire door; 3. Although the sealant strips used for fire doors are all flame-retardant materials, they cannot block smoke well after the fire door has been exposed to high temperatures for several hours. Firefighters must complete the firefighting and rescue in the cargo yard within several hours, otherwise the fire will spread out of control. Summary of the invention

[0004] The technical problem to be solved by the present invention is: how to improve the structure of the fire door so that when encountering a fire, it can ensure a stable fire prevention effect for a long time and suppress the spread of fire and smoke.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A fireproof door comprises a door frame and a door leaf;

[0007] One side of the door leaf is pivotally connected to the door frame;

[0008] The inner circle of the door frame is provided with a step, and a first groove is provided on the side of the inner corner of the step facing the door opening direction; a first water pipe is embedded in the upper frame of the door frame, and the first water pipe is connected to an electric control valve;

[0009] The door leaf comprises a panel, a frame and a core board;

[0010] The frame is connected between two panels, forming a cavity between the two panels, and the core board is filled in the cavity; a second water pipe is provided in the cavity. When the door leaf is closed, the axis of the upper end of the second water pipe coincides with the axis of the lower end of the first water pipe, and the diameter of the upper end of the second water pipe is the same as that of the lower end of the first water pipe; a number of through holes are evenly distributed on the side surface of the second water pipe, and there is a gap between the core board and the door leaf;

[0011] A first sealing strip is connected to the outside between the two panels. The first sealing strip is connected to the inner side of the panel through a water-soluble adhesive layer on both sides. The first sealing strip is provided with a plurality of flow channels. The starting end of the flow channel faces the cavity of the door leaf, and the end of the flow channel faces the outside of the door leaf and departs from the direction of opening the door or the side facing the direction of opening the door. The diameter of the flow channel gradually decreases from the starting end to the end. When the door leaf is closed, there is a gap between the first sealing strip and the inner side surface of the door frame;

[0012] The panel on the side of the door leaf departing from the direction of opening the door is provided with a second groove corresponding to the position of the first groove. A second sealing strip is embedded in the second groove. The second groove is also provided with a through groove communicating with the cavity of the door leaf. The side surface of the second sealing strip is connected to the side wall of the second groove through a water-soluble adhesive layer. When the door leaf is closed, there is a gap between the second sealing strip and the bottom of the first groove;

[0013] The edge of the panel on the side of the door leaf facing the direction of opening the door is connected with a third sealing strip. When the door leaf is closed, the third sealing strip seals the gap between the door frame and the door leaf.

[0014] Further, in the above fire door structure, a movable connection pipe is slidably connected in the first water pipe. The lower end of the movable connection pipe extends outwards with a chamfer. The inner wall of the first water pipe near the lower end is provided with a first limiting groove arranged radially along the first water pipe. A first elastic limiting member is slidably connected in the first limiting groove. The first elastic limiting member includes a first spring and a first limiting block. The first spring is connected between the bottom of the first limiting groove and the first limiting block. The first limiting block is provided with a slope matching the chamfer slope of the lower end extension of the movable connection pipe; a circular protruding portion is provided on the inner wall of the movable connection pipe;

[0015] The inner wall of the second water pipe near the upper end is provided with a second elastic limiting member. The second elastic limiting member includes a second spring and a second limiting block. The second spring is connected between the bottom of the second limiting groove and the second limiting block. The second limiting block is provided with a slope matching the chamfer slope of the lower end extension of the movable connection pipe;

[0016] The elasticity of the first spring is less than the elasticity of the second spring.

[0017] Furthermore, in the above-mentioned fire door structure, the upper edge of the inner wall of the movable connecting pipe is provided with a chamfer.

[0018] Furthermore, in the above-mentioned fire door structure, the frame is connected with an expanded graphite strip, and the expanded graphite strip is against the inner side of the first sealing strip.

[0019] Furthermore, in the above-mentioned fire door structure, the lower section of the first limiting block facing the inner cavity of the first water pipe is also provided with an inclined surface in the opposite direction to the chamfered inclination direction of the outer extension of the lower end of the movable connecting pipe.

[0020] Furthermore, in the above-mentioned fire door structure, a sealing film is provided at the upper end of the second water pipe.

[0021] Furthermore, in the above-mentioned fire door structure, a sealing film is provided at the lower end of the first water pipe.

[0022] Furthermore, in the above-mentioned fire door structure, an electric control valve control panel is provided on the side of the door frame facing away from the door, and the electric control valve control panel is electrically connected to the electric control valve, and the electric control valve is used to control the opening of the electric control valve.

[0023] The beneficial effects of the present invention are:

[0024] When no fire occurs and the door leaf is closed, there is a gap between the first sealing strip and the inner side of the door frame, and there is a gap between the second sealing strip and the bottom of the first groove. The advantage of this structure is that, particularly in cases where the normally closed fire door needs to be repeatedly opened and closed for frequent entry and exit, the sealing strip will not repeatedly contact, squeeze, or separate from the door frame, thereby greatly increasing the service life of the sealing strip.

[0025] In case of a fire, the electric control valve opens, allowing water to enter the second water pipe through the first water pipe, and then enter the gap (inside the cavity) between the core board and the panel through the through holes on the side wall of the second water pipe. Due to the relatively high water pressure in the second water pipe, the first sealing strip is pushed outwards by the water pressure and contacts the inner wall of the door frame, achieving the first-level sealing effect. At the same time, the second sealing strip is pushed outwards by the water pressure and contacts the first groove, achieving the second-level sealing effect. When the door leaf is closed, the third sealing strip naturally contacts the door frame, closing the door gap at the position where the door leaf opens, achieving the third-level sealing effect. At the same time, a part of the water flows out through the flow channel of the first sealing strip, forming two water seals respectively between the first sealing strip and the second sealing strip and between the second sealing strip and the third sealing strip at the door gap, further improving the sealing effect. In the design of the flow channel, a design with the aperture gradually decreasing from the start end to the end is adopted, and the end is respectively oriented towards the front and back directions of the door leaf. When the water flows through the flow channel, an outward thrust is generated on the first sealing strip, assisting the contact sealing between the first sealing strip and the door frame; through the above structure, multi-level sealing of the door gap during a fire is achieved, and the water flow can cool the inside of the door leaf as well as the door leaf and the door frame, enabling it to maintain a stable fireproof effect for a long time when encountering a fire, suppressing the spread of fire and smoke.

[0026] Furthermore, when a fire breaks out, water enters the first water pipe through the electrically controlled valve. The impact force of the water flow contacts the circular protrusion on the inner wall of the movable connection pipe, causing the frictional force between the first limiting block generated by the elastic force of the first spring of the first elastic limiting member and the outer wall of the movable connection pipe to be less than the thrust force for the movable connection pipe to move downward generated by the impact force of the water flow. As a result, the movable connection pipe moves downward out of the positioning of the first elastic limiting member to a position between the first water pipe and the second water pipe. At this time, the movable connection pipe is limited by the second elastic limiting member, enabling the first water pipe and the second water pipe to be automatically docked, allowing the water flow to smoothly enter the second water pipe. Another advantage of this structure is that when the movable connection pipe is limited by the second elastic limiting member and is stuck between the first water pipe and the second water pipe, it also functions as a lock for the door leaf. That is, by using the movable connection pipe to hold the door leaf, the door leaf cannot be opened normally, which also protects the users on this floor and prevents the users on this floor from accidentally opening the door leaf, causing the spread of smoke and fire. Using the movable connection pipe to hold the door leaf is to prevent the people on this floor from accidentally opening the door leaf when the rescue personnel have not arrived. When the rescue personnel arrive or the people on this floor need to escape urgently, the electrically controlled valve can be controlled to open completely, increasing the impact force of the water flow further. This makes the frictional force between the second limiting block generated by the elastic force of the second spring of the second elastic limiting member and the outer wall of the movable connection pipe less than the thrust force for the movable connection pipe to move downward generated by the impact force of the water flow. As a result, the movable connection pipe moves downward out of the positioning of the first elastic limiting member and completely enters the second water pipe. At this time, the movable connection pipe is disengaged from the limiting and locking of the door leaf and the door frame, and the fire door can be opened normally. On the other hand, when the movable connection pipe completely enters the second water pipe, the water flow will split out from the gap between the first water pipe and the second water pipe, thereby reducing the water pressure inside the door leaf and causing the first sealing strip and the second sealing strip to lose their sealing effect on the door frame, further facilitating the opening of the door leaf. When the door leaf is opened, the water flow flowing out from the lower end of the first water pipe directly sprays on the passing people, which can also effectively reduce the high-temperature burns of the escaping people and help the people on this floor to escape urgently. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 FIG. is a schematic structural view of a fire door according to a specific embodiment of the present invention from the perspective of the side where the door opening direction is located;

[0028] Figure 2 is Figure 1 sectional view taken along line A-A;

[0029] Figure 3 is Figure 2 enlarged view of part B;

[0030] Figure 4 FIG. is a schematic structural view of the door frame of a fire door according to a specific embodiment of the present invention from the perspective of the side where the door opening direction is located;

[0031] Figure 5Schematic diagram of the connection state of the first water pipe, movable connection pipe and second water pipe of a fire door in the first state according to a specific embodiment of the present invention;

[0032] Figure 6 Schematic diagram of the connection state of the first water pipe, movable connection pipe and second water pipe of a fire door in the second state according to a specific embodiment of the present invention;

[0033] Label description:

[0034] 1. Door frame; 11. Step; 12. First groove; 13. First water pipe; 131. First limiting groove; 132. First elastic limiting member; 133. First spring; 134. First limiting block; 1341. Slope; 1342. Inclined surface;

[0035] 2. Door leaf; 21. Panel; 22. Frame; 23. Core board; 24. Cavity; 25. Second water pipe; 251. Through hole; 252. Second limiting groove; 253. Second elastic limiting member; 254. Second spring; 255. Second limiting block; 26. Second groove; 27. Through slot;

[0036] 3. First sealing strip; 31. Flow channel;

[0037] 4. Second sealing strip;

[0038] 5. Third sealing strip;

[0039] 6. Movable connection pipe; 61. Protrusion;

[0040] 7. Expanded graphite strip.

[0041] 8. Electric control valve. Specific embodiment

[0042] To describe in detail the technical content, achieved purpose and effects of the present invention, the following is described in conjunction with the embodiments and with reference to the drawings.

[0043] Please refer to Figures 1 to 6 , the embodiment of the present invention relates to a fire door, including a door frame 1 and a door leaf 2;

[0044] One side of the door leaf 2 is pivotally connected to the door frame 1;

[0045] A step 11 is provided around the inner circle of the door frame 1, and a first groove 12 is provided at the inner corner of the step 11 facing the opening direction of the door leaf 2; a first water pipe 13 is embedded in the upper frame of the door frame 1, and the first water pipe 13 is connected to an electric control valve 8;

[0046] The door leaf 2 includes a panel 21, a frame 22 and a core board 23;

[0047] The frame 22 is connected between two panels 21, forming a cavity 24 between the two panels 21. The core board 23 is filled in the cavity 24. A second water pipe 25 is provided in the cavity 24. When the door leaf 2 is closed, the axis of the upper end of the second water pipe 25 coincides with the axis of the lower end of the first water pipe 13, and the diameter of the upper end of the second water pipe 25 is the same as that of the lower end of the first water pipe 13. A number of through holes 251 are evenly distributed on the side surface of the second water pipe 25, and there is a gap between the core board 23 and the door leaf 2.

[0048] A first sealing strip 3 is connected to the outside between the two panels 21. The two sides of the first sealing strip 3 are respectively connected to the inner side of the panel 21 through a water-soluble adhesive layer. The first sealing strip 3 is provided with a plurality of flow channels 31. The starting end of the flow channel 31 faces the cavity 24 of the door leaf 2, and the end of the flow channel 31 faces the side of the door leaf 2 away from the door-opening direction or towards the door-opening direction. The diameter of the flow channel 31 gradually decreases from the starting end to the end. When the door leaf 2 is closed, there is a gap between the first sealing strip 3 and the inner side surface of the door frame 1.

[0049] The panel 21 on the side of the door leaf 2 away from the door-opening direction is provided with a second groove 26 corresponding to the position of the first groove 12. A second sealing strip 4 is embedded in the second groove 26. The second groove 26 is also provided with a through groove 27 communicating with the cavity 24 of the door leaf 2. The side surface of the second sealing strip 4 is connected to the side wall of the second groove 26 through a water-soluble adhesive layer. When the door leaf 2 is closed, there is a gap between the second sealing strip 4 and the bottom of the first groove 12.

[0050] The edge of the panel 21 on the side of the door leaf 2 towards the door-opening direction is connected with a third sealing strip 5. When the door leaf 2 is closed, the third sealing strip 5 seals the gap between the door frame 1 and the door leaf 2.

[0051] In the above structure, referring to Figure 1 and Figure 4 , the lower half of the first water pipe 13 can be embedded in the door frame 1, then extend out from one side of the door-opening direction of the door frame 1 through a bend, and then connect to an electric control valve 8 through a second bend. The electric control valve 8 can be a solenoid valve, and the opening degree of the electric control valve 8 can be remotely controlled by an electric control module. The first water pipe 13 can be connected to the water pipe of the fire extinguishing system or the water pipe of public water use. When a fire occurs, the electric control valve 8 can be remotely controlled to open, so that water enters the second water pipe 25 through the first water pipe 13.

[0052] Referring to Figure 1 , taking a single-leaf normally closed fire door as an example, the normally closed fire door is automatically closed by a door closer when there is no one passing through.

[0053] When there is no fire and the door leaf 2 is closed, there is a gap between the first sealing strip 3 and the inner side of the door frame 1, and there is a gap between the second sealing strip 4 and the bottom of the first groove 12. The advantage of this structure is that, especially in the case of a normally closed fire door that needs to be repeatedly opened and closed frequently for entry and exit, the sealing strip will not repeatedly contact, squeeze, and separate from the door frame 1, thus greatly increasing the service life of the sealing strip. That is, in the case of no fire, the sealing strip does not play a role in sealing the door gap.

[0054] In a preferred solution, the electric control valve 8 can be electrically connected to the smoke alarm through an automatic controller. When the smoke alarm senses that the environmental smoke concentration reaches a preset threshold, that is, when a fire occurs, the electric control valve 8 is automatically controlled to open, so that water enters the second water pipe 25 through the first water pipe 13 and enters the gap (inside the cavity 24) between the core board 23 and the panel 21 through the through holes 251 on the side wall of the second water pipe 25. Refer to Figure 2 , due to the relatively large water pressure introduced into the second water pipe 25, the first sealing strip 3 is pushed outwards by the water pressure and contacts the inner wall of the door frame 1 to achieve the first-level sealing effect. At the same time, the second sealing strip 4 is pushed outwards by the water pressure and contacts the first groove 12 to achieve the second-level sealing effect. When the door leaf 2 is closed, the third sealing strip 5 naturally contacts the door frame 1 to seal the door gap at the opening direction position of the door leaf 2 to achieve the third-level sealing effect. At the same time, a part of the water flows out through the flow channel 31 of the first sealing strip 3, and two water seals are respectively formed between the first sealing strip 3 and the second sealing strip 4 and between the second sealing strip 4 and the third sealing strip 5 at the door gap, further improving the sealing effect. In the design of the flow channel 31, a design with the aperture gradually decreasing from the starting end to the ending end is adopted, and the ending ends are respectively oriented towards the front and back directions of the door leaf 2, so that when the water flows through the flow channel 31, an outward thrust is generated on the first sealing strip 3 to assist the contact sealing between the first sealing strip 3 and the door frame 1.

[0055] It should be noted that a drain port or a drain pipe can be provided at the lower part of the door frame 1 to facilitate the drainage of the water between the door gaps.

[0056] In this embodiment, preferably, a movable connecting pipe 6 is slidably connected in the first water pipe 13. The lower end of the movable connecting pipe 6 extends outwards with a chamfer. The inner wall of the first water pipe 13 near the lower end is provided with a first limiting groove 131 arranged radially along the first water pipe 13. A first elastic limiting member 132 is slidably connected in the first limiting groove 131. The first elastic limiting member 132 includes a first spring 133 and a first limiting block 134. The first spring 133 is connected between the bottom of the first limiting groove 131 and the first limiting block 134. The first limiting block 134 is provided with a slope 1341 that matches the chamfer slope of the lower end extension of the movable connecting pipe 6; a circular protruding portion 61 is provided on the inner wall of the movable connecting pipe 6;

[0057] On the inner wall of the second water pipe 25 near the upper end, a second elastic limiting member 253 is provided. The second elastic limiting member 253 includes a second spring 254 and a second limiting block 255. The second spring 254 is connected between the bottom of the second limiting groove 252 and the second limiting block 255. The second limiting block 255 is provided with a slope 1341 that matches the chamfer slope of the outer extension of the lower end of the movable connecting pipe 6.

[0058] The elasticity of the first spring 133 is less than that of the second spring 254.

[0059] In the above structure, when there is no fire, referring to Figure 5 , this is the first state at this time. The movable connecting pipe 6 stays on the inner wall of the first water pipe 13 near the lower end due to the limitation of the first elastic limiting member 132.

[0060] When a fire occurs, water enters the first water pipe 13 through the electric control valve 8. The impact force of the water flow contacts the circular protrusion 61 on the inner wall of the movable connecting pipe 6, making the friction force between the first limiting block 134 of the first spring 133 of the first elastic limiting member 132 and the outer wall of the movable connecting pipe 6 less than the thrust generated by the water flow impact force for the movable connecting pipe 6 to move downward. As a result, the movable connecting pipe 6 disengages from the positioning of the first elastic limiting member 132 and moves downward to the position between the first water pipe 13 and the second water pipe 25. At this time, the movable connecting pipe 6 is limited by the second elastic limiting member 253, enabling the first water pipe 13 and the second water pipe 25 to be automatically docked, allowing the water flow to smoothly enter the second water pipe 25; referring to Figure 6, At this time, it is in the second state. Another advantage of this structure is that when the movable adapter 6 is stuck between the first water pipe 13 and the second water pipe 25 under the limiting action of the second elastic limiting member 253, it also plays the role of locking the door leaf 2, that is, the movable adapter 6 holds the door leaf 2, preventing the door leaf 2 from being opened normally, and also protecting the users on this floor, avoiding the spread of smoke and fire caused by the users on this floor accidentally opening the door leaf 2. It should be noted that the movable adapter 6 holding the door leaf 2 is to prevent the personnel on this floor from accidentally opening the door leaf 2 when the rescue personnel have not arrived. When the rescue personnel arrive or the personnel on this floor need to escape urgently, the electric control valve 8 can be controlled to open completely, increasing the impact force of the water flow further. The frictional force between the second limiting block 255 generated by the elastic force of the second spring 254 of the second elastic limiting member 253 and the outer wall of the movable adapter 6 is less than the downward moving thrust of the movable adapter 6 generated by the impact force of the water flow, so that the movable adapter 6 breaks away from the positioning of the first elastic limiting member 132 and moves downward completely into the second water pipe 25. At this time, the movable adapter 6 disengages from the limiting and locking of the door leaf 2 and the door frame 1, and this fire door can be opened normally. On the other hand, when the movable adapter 6 completely enters the second water pipe 25, the water flow will flow out from the gap between the first water pipe 13 and the second water pipe 25, thereby reducing the water pressure inside the door leaf 2, making the first sealing strip 3 and the second sealing strip 4 lose the sealing effect on the door frame 1, further facilitating the opening of the door leaf 2. When the door leaf 2 is opened, the water flow flowing out from the lower end of the first water pipe 13 directly sprays on the passing personnel, which can also effectively reduce the high-temperature burns of the escaping personnel and help the personnel on this floor to escape urgently.

[0061] In this embodiment, preferably, a chamfer is provided along the inner wall of the movable adapter 6 to make the water flow more easily flow through the inner wall of the movable adapter 6.

[0062] In this embodiment, preferably, the frame 22 is connected with an expanded graphite rubber strip 7, and the expanded graphite rubber strip 7 abuts against the inner side of the first sealing strip 3.

[0063] In the above structure, when the fire is intense, the temperature of the door leaf 2 and the door frame 1 will increase. At this time, the expanded graphite rubber strip 7 expands when heated, which can assist in pushing the first sealing strip 3 outwards, further improving the sealing effect between the door frame 1 and the door leaf 2.

[0064] In this embodiment, preferably, a slope 1342 with an inclination direction opposite to that of the chamfer at the lower end of the outer extension of the movable adapter 6 is further provided on the lower section of the first limiting block 134 facing the inner cavity of the first water pipe 13.

[0065] In the above structure, after a fire, it is generally necessary to replace a new fire door. In the present invention, since the sealing structures such as the sealing strips are arranged in the door leaf 2, it is generally only necessary to replace the new door leaf 2. However, since the movable connecting pipe 6 originally in the first water pipe 13 will enter the second water pipe 25 after a fire occurs, in addition to replacing the door leaf 2, it is also necessary to reinstall a new movable connecting pipe 6 in the first water pipe 13, and the inclined surface 1342 of the above-mentioned first limit block 134 facilitates pushing the new movable connecting pipe 6 from the lower end of the first water pipe 13 for limiting.

[0066] In this embodiment, a sealing film is provided at the upper end of the second water pipe 25 .

[0067] In this embodiment, a sealing film is provided at the lower end of the first water pipe 13 .

[0068] In the above structure, when there is no fire, the lower end of the first water pipe 13 and the upper end of the second water pipe 25 can be sealed by the sealing film to prevent insects from entering. When a fire occurs, the sealing film can be easily broken by the impact of the water flow to allow the water flow to pass.

[0069] In this embodiment, preferably, a control panel 21 of the electric control valve 8 is provided on the side of the door frame 1 facing away from the door, and the control panel 21 is electrically connected to the electric control valve 8 , and the electric control valve 8 is used to control the opening of the electric control valve 8 .

[0070] In the above structure, when the personnel on this floor need to escape urgently, the opening of the electric control valve 8 can be controlled through the control panel 21, thereby increasing the water pressure and allowing the movable connecting pipe 6 to completely enter the second water pipe 25, so that the door leaf 2 can be opened to escape.

[0071] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A fire door, characterized in that, It includes a door frame and a door leaf; One side of the door leaf is pivotally connected to the door frame; There is a step around the inner circle of the door frame, and a first groove is provided at the inner corner of the step facing the side of the door leaf's opening direction; a first water pipe is embedded in the upper frame of the door frame, and the first water pipe is connected to an electric control valve; The door leaf includes a panel, a frame and a core board; The frame is connected between two panels, forming a cavity between the two panels, and the core board is filled in the cavity; a second water pipe is provided in the cavity. When the door leaf is closed, the axis of the upper end of the second water pipe coincides with the axis of the lower end of the first water pipe, and the diameter of the upper end of the second water pipe is the same as that of the lower end of the first water pipe; a number of through holes are evenly distributed on the side of the second water pipe, and there is a gap between the core board and the panel; A first sealing strip is connected to the outside between the two panels. The two sides of the first sealing strip are respectively connected to the inner side of the panel through a water-soluble adhesive layer. The first sealing strip is provided with a plurality of flow channels. The starting end of the flow channel faces the cavity of the door leaf, and the end of the flow channel faces the outside of the door leaf away from the opening direction or the side facing the opening direction. The diameter of the flow channel gradually decreases from the starting end to the end. When the door leaf is closed, there is a gap between the first sealing strip and the inner side of the door frame; A second groove corresponding to the position of the first groove is provided on the panel on the side of the door leaf away from the opening direction. A second sealing strip is embedded in the second groove. The second groove is also provided with a through groove communicating with the cavity of the door leaf. The side of the second sealing strip is connected to the side wall of the second groove through a water-soluble adhesive layer. When the door leaf is closed, there is a gap between the second sealing strip and the bottom of the first groove; A third sealing strip is connected to the edge of the panel on the side of the door leaf facing the opening direction. When the door leaf is closed, the third sealing strip seals the gap between the door frame and the door leaf; When a fire occurs, the electric control valve is opened, so that water enters the second water pipe through the first water pipe, and enters the gap between the core board and the panel through the through holes on the side wall of the second water pipe. Due to the relatively large water pressure introduced into the second water pipe, the first sealing strip is pushed outwards by the water pressure and contacts the inner wall of the door frame, achieving the first-level sealing effect. At the same time, the second sealing strip is pushed outwards by the water pressure and contacts the first groove, achieving the second-level sealing effect.

2. The fire door according to claim 1, wherein An active connecting pipe is slidably connected in the first water pipe. The lower end of the active connecting pipe extends outwards with a chamfer. The inner wall of the first water pipe near the lower end is provided with a first limiting groove arranged radially along the first water pipe. A first elastic limiting member is slidably connected in the first limiting groove. The first elastic limiting member includes a first spring and a first limiting block. The first spring is connected between the bottom of the first limiting groove and the first limiting block. The first limiting block is provided with a slope matching the chamfer slope of the lower end extension of the active connecting pipe; a circular protruding portion is provided on the inner wall of the active connecting pipe; The inner wall of the second water pipe near the upper end is provided with a second elastic limiting member. The second elastic limiting member includes a second spring and a second limiting block. The second spring is connected between the bottom of the second limiting groove and the second limiting block. The second limiting block is provided with a slope matching the chamfer slope of the lower end extension of the active connecting pipe; The elasticity of the first spring is smaller than the elasticity of the second spring.

3. The fire door according to claim 2, characterized in that, The upper edge of the inner wall of the movable connecting pipe is chamfered.

4. The fire door according to claim 1, characterized in that, The frame is connected with an expanded graphite strip, and the expanded graphite strip abuts against the inner side of the first sealing strip.

5. The fire door according to claim 2, characterized in that, The lower section of the first limiting block facing the inner cavity of the first water pipe is also provided with an inclined surface in the opposite direction to the chamfered inclination direction of the outer extension of the lower end of the movable connecting pipe.

6. The fire door according to claim 1, characterized in that, A sealing film is provided at the upper end of the second water pipe.

7. The fire door according to claim 1, characterized in that, A sealing film is provided at the lower end of the first water pipe.

8. The fire door according to claim 1, characterized in that, An electric control valve control panel is provided on the side of the door frame facing away from the door. The electric control valve control panel is electrically connected to the electric control valve, and the electric control valve is used to control the opening of the electric control valve.

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