A fire door with smoke and dust barrier structure

Abstract

The present invention relates to the technical field of fire doors, and specifically to a fire door with a smoke and dust blocking structure, comprising a driving mechanism, a sealing mechanism and a pressing mechanism; the driving mechanism is connected to a door frame; the sealing mechanism is connected to the driving mechanism; the pressing mechanism is connected to the door frame; by designing a sealing strip as a movable structure, the sealing strip shrinks into the door frame when the fire door is opened, and the sealing strip extends and adheres to the door leaf when the fire door is closed to close the door gap, and the sealing end face of the sealing strip does not rub against any structure during the sliding process. When a fire occurs, the sealing strip is further pressed against the door leaf by the high temperature; the problem that the normally closed fire door set in a stairwell with a large flow of people is frequently opened and closed, resulting in the sealing strip being worn during the door opening and closing process and being unable to effectively block smoke is solved.

Description

Technical Field

[0001] The invention relates to the technical field of fire doors, and in particular to a fire door with a smoke and dust barrier structure. Background Art

[0002] A fire door is a special type of door used to prevent the spread of fire. It uses fireproof materials and special structural designs to achieve the purpose of heat insulation and prevent the spread of fire. Currently, fire doors are usually installed in stairwells, pipe shafts, refuge floors, etc. to ensure that people can evacuate safely in the event of a fire.

[0003] When a fire occurs, most of the victims are usually not killed by direct burns from the flames, but because they inhale too much toxic smoke, which leads to suffocation or poisoning and coma, making it impossible to escape the fire scene in time. Currently, fire doors need to ensure that they can provide smoke barrier effects while preventing the spread of fire. Fire doors on the market usually add sealing strips at the door gap to prevent smoke from entering the safe area through the door gap. However, as people walk around, the exposed sealing strips will be constantly squeezed and worn due to being stepped on. At the same time, when people carry goods, the goods will also scratch the sealing strips, resulting in a decrease in its sealing performance, affecting the smoke barrier effect. The prior art has proposed a good solution to this problem. For example, patent publication number CN116201457B discloses a fire door for buildings. When the door panel is opened, the pressure rod automatically retracts into the middle groove. When the door panel is closed, the pressure rod extends outward, thereby prompting the rubber sealing strip installed on the pressure rod to play a role and ensure the sealing effect, thereby preventing the sealing strip from being exposed when the door panel is open, which may cause the sealing strip to be compressed or worn and cause the sealing performance to be weakened.

[0004] Although the existing technology has solved the problem that the sealing strip is exposed when the fire door is open, which causes the sealing strip to be compressed or worn and causes the sealing performance to be weakened, making it impossible to effectively block smoke and dust when a fire occurs, the following problems still exist: since the sealing strip needs to fit tightly against the door frame when closed, fire, smoke and toxic gases cannot spread through the gap; the fire door in the stairwell is usually designed to automatically close after opening, so as to avoid people being unable to rush to the fire door to close the door when a fire occurs; in places with large traffic such as shopping malls, supermarkets or hospitals, fire doors need to be opened and closed frequently. During the process of opening and closing the door, the side wall of the sealing strip will continue to rub, squeeze and stretch against the door frame and door leaf, thereby accelerating its aging and wear process, causing smoke and dust to flow from the side wall position where the sealing strip slides relatively with the door frame; since the occurrence of a fire cannot be predicted in advance, if the side wall of the sealing strip is worn and the regular maintenance time has not arrived, the fire door will lose its effect of blocking smoke and dust.

[0005] In view of the above situation, in order to overcome the above technical problems, the present invention designs a fire door with a smoke and dust blocking structure. Summary of the invention

[0006] The present invention provides a fire door with a smoke and dust blocking structure, which solves the problem that the normally closed fire door set in the stairwell with large flow of people is frequently opened and closed, resulting in the wearing of the sealing strip during the opening and closing of the door and the inability to effectively block the smoke. The present invention designs the sealing strip as a movable structure. When the fire door is opened, the sealing strip shrinks into the door frame. When the fire door is closed, the sealing strip extends out and adheres to the door leaf to seal the door gap. During the sliding process, the sealing end face of the sealing strip does not rub against any structure. When a fire occurs, the sealing strip is further pressed against the door leaf by the high temperature.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A fireproof door with a smoke and dust barrier structure comprises a door frame, a door leaf, a hinge and a door closer, and also comprises a driving mechanism, a sealing mechanism and a pressing mechanism; the driving mechanism is connected to the door frame; the sealing mechanism is connected to the driving mechanism; the pressing mechanism is connected to the door frame; when the door leaf is closed, the driving mechanism is squeezed, the driving mechanism slides under pressure, the driving mechanism slides and pushes the sealing mechanism, so that the sealing mechanism slides from the door frame to the gap between the door frame and the door leaf, when the temperature rises, the liquid in the pressing mechanism vaporizes to make the pressing mechanism slide, and the pressing mechanism slides to press the sealing mechanism against the door leaf.

[0009] Preferably, the sealing mechanism includes a sealing strip, a horizontal slide groove and a vertical slide groove; the sealing strip is connected to the driving mechanism, and is an L-shaped structure, with four sealing strips in total, and the side of the sealing strip facing the door leaf is a sealing end face; the horizontal slide groove is symmetrically opened on the left and right sides of the door frame; the vertical slide groove is symmetrically opened on the upper and lower sides of the door frame.

[0010] In the above scheme, the sealing strip is slidably installed in the horizontal slide groove and the vertical slide groove to ensure that the sealing strip can be retracted in the horizontal slide groove and the vertical slide groove when the door is open, so as to ensure that it will not be worn by external trampling or the like; the sealing strip is set to an L-shaped structure to ensure that it can form a mouth-shaped structure when it slides toward the center of the door leaf, thereby completely sealing the gap between the door leaf and the door frame, and because the sealing strip is not clamped between the door gaps, but is pressed against the door leaf, and it is installed in the door frame, it is ensured that the sealing end surface area between the sealing strip and the door leaf can completely seal the door gap, and it is not easy to cause the sealing end surface to be worn due to the normal opening and closing of the door, and even if the side of the sealing strip is worn, it will not affect its normal sealing effect.

[0011] Preferably, a clamping slope is provided on the upper part of the horizontal slide groove, and a sealing slope is provided on the bottom; the sealing strip also includes a transverse part and a vertical part; the transverse part is slidably installed in the horizontal slide groove, the upper end of the transverse part is provided with a pressure slope with a complementary angle to the clamping slope, and the bottom surface of the transverse part is provided with a sliding slope with a complementary angle to the sealing slope; the vertical part is slidably installed in the vertical slide groove.

[0012] In the above scheme, the pressure inclined surface cooperates with the clamping inclined surface to ensure that the sealing strip does not contact the door leaf during the sliding process, thereby reducing the friction between the door frame and the door leaf, thereby reducing the wear of the sealing end surface every time the door is opened and closed, and sliding the clamping inclined surface to fit the door leaf to ensure that the transverse part is completely pressed against the door frame and the door leaf, thereby ensuring the sealing effect at the door frame and the upper and lower ends of the door leaf.

[0013] Preferably, a spring clamp groove is provided below the pressure-bearing inclined surface; a compression spring is provided in the spring clamp groove.

[0014] In the above scheme, since the pressure bevel is the place where the sealing strip is most likely to wear, the pressure bevel part is made into an elastic structure, so that a spring-connected structure is formed between the pressure bevel and the sealing end face, so that the compression spring can press the pressure bevel on the clamping bevel, and the sealing end face is pressed on the door leaf. On the one hand, it avoids the sealing failure caused by the sealing end face below the pressure bevel no longer being tightly attached to the door leaf after the pressure bevel is worn. On the other hand, it ensures the guiding effect of the pressure bevel along the clamping bevel, and after the pressure bevel is worn, the pressure bevel can still be pressed on the clamping bevel under the elastic force of the compression spring. Unless the pressure bevel is completely worn out, the sealing effect can be always guaranteed.

[0015] Preferably, a sealing slope is provided at the upper end of the vertical slide groove; the sealing slope has an angle equal to that of the pressing slope; and a sliding slope whose angle is complementary to that of the sealing slope is provided at the upper end of the vertical portion.

[0016] In the above scheme, the sealing bevel and the angle thereof are equal to the pressing bevel, so as to ensure that the end face of the sealing strip that is about to fit with the door leaf is always kept horizontal during the sliding process, so that the sealing strip can fit completely without bending when pressed onto the door leaf, thereby avoiding the formation of a gap between the sealing end face and the door leaf; the sliding bevel is guided by the sealing bevel, so that the sealing end face does not rub against the vertical slide groove and the horizontal slide groove during the sliding process, thereby avoiding the wear of the sealing end face, increasing the service life and ensuring the sealing effect.

[0017] Preferably, the driving mechanism includes a connecting pressure block, a driving pressure groove, a driving pressure block, a driving slide groove, a driving slider, a return spring, a driving connecting rod, a connecting slider and a pressure assembly; the connecting pressure block is connected to the door leaf; the driving pressure groove is opened on the door frame; the driving pressure block is slidably installed in the driving pressure groove; the driving slide groove is symmetrically opened on both sides of the door frame; the driving slider is slidably installed in the driving slide groove; the return spring is connected between the driving slider and the bottom of the driving slide groove; the driving connecting rod is connected to the driving slider; the side of the connecting slider is connected to the driving connecting rod, and the bottom is connected to the sealing strip; the pressure assembly is connected to the connecting slider.

[0018] In the above scheme, when the door is opened from a large angle to a small angle, the connecting pressure block rotates with the door leaf, and the connecting pressure block will not contact the driving pressure block during this process, ensuring that the sealing strip will not extend when the door is opened at a small angle, preventing people from stepping on the sealing strip when opening the fire door at a small angle to pass through, causing damage to the sealing strip; when the fire door is opened from a small angle to a closed state, the connecting pressure block presses the driving pressure block, which is pressed by the driving pressure block through the driving slider, thereby sliding in the driving slide groove, thereby driving the sealing strip to slide; when opening the door, the sealing strip is pulled back to the inside of the door frame under the elastic force of the return spring, and the whole process is automatic, ensuring that the fire door is in a sealed state as a whole after closing the door, and the sealing effect can be guaranteed no matter when a fire occurs; multiple driving sliders can be provided here, and they are evenly provided at the upper, middle and lower parts of the door frame to ensure that the sealing strip will not deviate during the sliding process, thereby further improving the sealing effect.

[0019] Preferably, a retractable slot is provided on the driving slider; the retractable slot is a rounded rectangular structure that passes through the driving slider, and buckle parts are provided at the opening positions on both sides of the retractable slot; the driving connecting rod is slidably installed in the retractable slot, and the top of the driving connecting rod is shorter than the vertical part, and a limiting buckle is provided on the top.

[0020] In the above scheme, the driving connecting rod is driven to slide in the contraction slide groove (this sliding is a sliding action combining vertical sliding and horizontal sliding), so that the sealing strip can be driven to move when the driving slider slides, and the top of the driving connecting rod is set shorter than the vertical part to ensure that when the upper and lower sealing strips slide to the position where the sealing end surface fits the door leaf, the two sealing strips can be tightly pressed against each other to prevent the existence of gaps between the upper and lower sealing strips.

[0021] Preferably, the driving pressure block is provided with a pressing inclined surface; the angle of the pressing inclined surface is less than 30 degrees; and the driving slider is provided with a driving inclined surface which is complementary to the angle of the pressing inclined surface.

[0022] In the above scheme, during the closing process, when the door leaf is about to be closed, the driving pressure block starts to slide. At this time, the pressing slope angle is reduced as much as possible, so that the driving pressure block only needs to slide a short distance to push out the sealing strip, ensuring that the inner circle of the sealing strip completely covers the door gap.

[0023] Preferably, the pressure assembly includes a pressure slot, a pressure slider and a pressure spring; the pressure slot is opened at the bottom of the driving slot; the pressure slider is slidably installed in the pressure slot; and the pressure spring is connected between the connecting slider and the pressure slider.

[0024] In the above scheme, pressure can be applied to the connecting slider through the pressure spring, so that the connecting slider connected to the sealing mechanism can drive the sealing mechanism, so that the sealing mechanism is away from the door leaf during the door opening and closing process. The sealing mechanism will fit with the door leaf only after the door leaf is completely closed. At the same time, during the sliding of the pressure slider in the pressure slide groove, the pressure slider can be limited by the pressure slide groove, so as to achieve the purpose of limiting the connecting slider by the pressure slider.

[0025] Preferably, the clamping mechanism includes an air cavity, a clamping channel, a clamping piston and an air cavity spring; the air cavity is arranged in a circle of the door frame, and liquid nitrogen is stored in the air cavity; the clamping channel is connected to the air cavity, and an exhaust half hole 1 is opened at the outlet position of the clamping channel; the clamping piston is slidably installed in the clamping channel, and an exhaust half hole 2 is opened at the tail of the clamping piston; the air cavity spring is connected to the clamping piston.

[0026] In the above scheme, when a fire occurs, the temperature in the air cavity rises, causing the liquid nitrogen in the air cavity to vaporize, and the pressure exerted by the gas on the clamping piston increases. When the pressure exceeds the limit value, the clamping piston slides, and the sliding of the clamping piston compresses the sealing strip, so that the sealing strip is pressed against the door leaf, thereby further improving the sealing effect; the exhaust half hole 1 and the exhaust half hole 2 between the clamping piston and the clamping channel cooperate to form an exhaust hole to discharge the vaporized nitrogen, further compressing the sealing strip, and at the same time, the liquid nitrogen can absorb a large amount of heat when it vaporizes, rapidly cooling the door leaf and the sealing strip, ensuring that the sealing strip will not be deformed under the action of high temperature, thereby further improving the sealing effect.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. Compared with the existing fire door which places the sealing strip on the side end face of the door leaf to form a seal, the present invention places the sealing strip on the rear side of the door leaf and presses the sealing strip against the door leaf after the door leaf is closed to form a seal, with a larger sealing area, and no friction will occur between the side face of the door leaf and the door frame during the door opening and closing process, thereby increasing the service life of the sealing strip, and due to the heat insulation effect of the door leaf itself, the heating speed of the sealing strip can be slowed down, thereby increasing the smoke blocking time when a fire occurs; on the other hand, the sealing strip is set to a structure that can slide and retract, so that when the fire door is opened, the sealing strip retracts inside the door frame to avoid stepping on and wearing the sealing strip during passage, and the sealing strip only starts to extend when the door leaf is closed to a small angle where passage is impossible, thereby avoiding people stepping on the sealing strip when opening the fire door at a small angle to pass through, causing damage to the sealing strip, further extending the service life of the sealing strip, and ensuring the smoke and dust blocking effect provided by the sealing strip during a fire.

[0029] 2. The present invention provides a horizontal slide groove and a vertical slide groove, and provides four L-shaped sealing strips, so that when the sealing strip slides out, the sealing end face gradually approaches the door leaf in an oblique path, ensuring that the sealing end face does not rub against the vertical slide groove and the horizontal slide groove, thereby avoiding the wear of the sealing end face, improving the service life of the sealing strip, and ensuring the sealing effect of the sealing strip in a tight state; at the same time, the compressed inclined surface that is in contact with the horizontal slide groove and prone to wear is set to an elastic structure, so that a spring-connected structure is formed between the compressed inclined surface and the sealing end face, so that the compression spring can press the compressed inclined surface against the clamping inclined surface, and the sealing end face is pressed against the door leaf, avoiding the sealing failure caused by the sealing end face below the compressed inclined surface no longer being in tight contact with the door leaf after the compressed inclined surface is worn, further ensuring the sealing effect of the sealing strip, and ensuring the smoke and dust barrier effect when a fire occurs.

[0030] 3. The present invention provides a clamping mechanism. When a fire occurs, the high-pressure liquid nitrogen stored in the air cavity vaporizes under the influence of the continuous increase in temperature. When the pressure exceeds the limit value, on the one hand, the clamping piston slides and presses on the sealing strip, so that the sealing strip is pressed on the door leaf, thereby further improving the sealing effect and blocking the spread of smoke; on the other hand, when the clamping piston slides to the clamping sealing strip, an exhaust hole is formed between the clamping piston and the clamping channel to discharge the vaporized nitrogen, further compressing the sealing strip. At the same time, since liquid nitrogen absorbs a large amount of heat during the vaporization process, the door leaf and the sealing strip can be rapidly cooled to ensure that the sealing strip will not be deformed under the action of high temperature, thereby further improving the sealing effect and ensuring the smoke barrier effect provided by the sealing strip when a fire occurs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is the overall structure diagram of the present invention;

[0033] Figure 2 It is a cross-sectional view of the internal structure of the present invention;

[0034] Figure 3 It is a schematic diagram of the internal structure of the door frame of the present invention;

[0035] Figure 4 It is a schematic diagram of the sealing strip structure of the present invention;

[0036] Figure 5 It is a cross-sectional view of the transverse part of the present invention;

[0037] Figure 6 for Figure 3 A magnified view of the structure at center;

[0038] Figure 7 It is a schematic diagram of the driving mechanism structure of the present invention;

[0039] Figure 8 A diagram showing the connection relationship between the driving connecting rod and the driving sliding block of the present invention;

[0040] Fig. 9 for Figure 2 A magnified view of the structure at B in the middle;

[0041] Fig.10 for Figure 2 A magnified view of the structure at C in the middle;

[0042] Fig.11 This is the state diagram of the door leaf being fully opened;

[0043] Fig.12 This is the motion trend diagram of the drive mechanism during the door leaf closing process;

[0044] Fig.13 This is the movement trend diagram of the sealing strip when the door leaf is closed;

[0045] Fig.14 This is a trend diagram of the lateral movement of the sealing strip during the closing process of the door leaf;

[0046] Fig.15 This is the lateral position diagram of the sealing strip when the door leaf is fully closed;

[0047] In the figure: 1, door frame; 2, door leaf; 3, hinge; 4, door closer; 5, driving mechanism; 51, connecting block; 52, driving groove; 53, driving block; 531, pressing inclined surface; 54, driving slide; 55, driving slide; 551, contraction slide; 5511, buckle; 552, driving inclined surface; 56, return spring; 57, driving connecting rod; 571, limit buckle; 58, connecting slide; 59, pressure assembly; 591, pressure slide; 592, pressure slide; 593, pressure spring; 6, sealing mechanism; 61. Sealing strip; 611. Sealing end face; 612. Horizontal part; 6121. Pressure slope; 6122. Sliding slope; 6123. Spring clamping groove; 6124. Compression spring; 613. Vertical part; 6131. ​​Sliding slope; 62. Horizontal slide groove; 621. Pressing slope; 622. Sealing slope; 63. Vertical slide groove; 631. Sealing slope; 7. Pressing mechanism; 71. Air cavity; 72. Pressing channel; 721. Exhaust half hole one; 73. Pressing piston; 731. Exhaust half hole two; 74. Air cavity spring. DETAILED DESCRIPTION

[0048] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0049] See also Figures 1 to 15 The present invention provides a fire door with a smoke and dust barrier structure, and the technical solution is as follows:

[0050] As a specific embodiment of the present invention, refer to Figure 1 and Figure 2 A fireproof door with a smoke and dust barrier structure, comprising a door frame 1, a door leaf 2, a hinge 3 and a door closer 4, and also comprising a driving mechanism 5, a sealing mechanism 6 and a pressing mechanism 7; the driving mechanism 5 is connected to the door frame 1; the sealing mechanism 6 is connected to the door frame 1; the pressing mechanism 7 is connected to the driving mechanism 5; when the door leaf 2 is closed, the driving mechanism 5 is pressed to slide under pressure, and the driving mechanism 5 slides to push the sealing mechanism 6, so that the sealing mechanism 6 slides from the door frame 1 to the gap between the door frame 1 and the door leaf 2 The sealing mechanism 6 is placed in a position, and the sliding trajectory of the sealing mechanism 6 in this process is to slide from a position away from the door leaf 2 to a position of the door leaf 2. When the door leaf 2 is fully closed, the sealing mechanism 6 reaches a position close to the door leaf 2. When the temperature rises, the liquid nitrogen in the clamping mechanism 7 vaporizes and expands to make the clamping mechanism 7 slide. The clamping mechanism 7 slides to press the sealing mechanism 6 against the door leaf 2. At the same time, the liquid nitrogen absorbs a large amount of heat during the vaporization process. The sealing mechanism 6 can be cooled during the heat absorption process, thereby protecting the sealing mechanism 6 and ensuring the sealing effect.

[0051] As a specific embodiment of the present invention, refer to Figure 3 , Figure 4 and Figure 5; The sealing mechanism 6 includes a sealing strip 61, a horizontal slide groove 62 and a vertical slide groove 63; the sealing strip 61 is connected to the driving mechanism 5, and the sealing strip 61 is an L-shaped structure, with four sealing strips in total. The sealing strip 61 is made of EPDM rubber to ensure the high temperature resistance of the sealing strip 61, and can expand to a certain extent under high temperature conditions, thereby improving the sealing performance and further ensuring the smoke and dust barrier effect; the side of the sealing strip 61 facing the door leaf 2 is a sealing end face 611; the horizontal slide groove 62 is symmetrically opened on the left and right sides of the door frame 1; the vertical slide groove 63 is symmetrically opened on the upper and lower sides of the door frame 1. By sliding the sealing strip 61 in the horizontal slide groove 62 and the vertical slide groove 63, it is ensured that when the door is opened, the sealing strip 61 can be retracted in the horizontal slide groove 62 and the vertical slide groove 63 to ensure that it will not be worn by external trampling or the like; the sealing strip 61 is set to an L-shaped structure to ensure that it can form a mouth-shaped structure when sliding toward the center of the door leaf 2, thereby completely sealing the gap between the door leaf 2 and the door frame 1, and because the sealing strip 61 is not clamped between the door gaps, but is pressed against the door leaf 2, and it is installed in the door frame 1, it is ensured that the area of ​​the sealing end surface 611 that fits between the sealing strip 61 and the door leaf 2 can completely seal the door gap, and it is not easy for the sealing end surface 611 to be worn due to the normal opening and closing of the door, and even if the side of the sealing strip 61 is worn, it will not affect its normal sealing effect. The upper part of the horizontal slide groove 62 is provided with a clamping slope 621, and the bottom is provided with a sealing slope 622. The clamping slope 621 and the sealing slope 622 are both smoothed, and the surface roughness is Ra3.2; the sealing strip 61 also includes a transverse portion 612 and a vertical portion 613; the transverse portion 612 is slidably installed in the horizontal slide groove 62, and the upper end of the transverse portion 612 is provided with a pressure slope 6121 with a complementary angle to the clamping slope 621, and the bottom surface of the transverse portion 612 is provided with a sliding slope 6122 with a complementary angle to the sealing slope 622. The pressure slope 6121 and the sliding slope 6122 are smoothed, and a ceramic coating is coated on the surface. On the one hand, it can reduce the friction coefficient and make it more wear-resistant, and on the other hand, it can improve the high temperature resistance to ensure that it is not easy to deform in the event of a fire; the vertical portion 613 is slidably installed in the vertical slide groove 63. The pressure inclined surface 6121 cooperates with the pressing inclined surface 621 to ensure that the sealing strip 61 does not contact the door leaf 2 during the sliding process, reduce the friction between the door frame 1 and the door leaf 2, and reduce the wear of the sealing end surface 611 each time the door is opened and closed. The pressing inclined surface 621 slides to fit the door leaf 2 to ensure that the transverse portion 612 is completely pressed against the door frame 1 and the door leaf 2, thereby ensuring the sealing effect at the upper and lower door gaps between the door frame 1 and the door leaf 2. A spring clamping groove 6123 is provided below the pressure inclined surface 6121; a compression spring 6124 is provided in the spring clamping groove 6123.Since the pressure bevel 6121 is the place where the sealing strip 61 is most likely to wear, the pressure bevel 6121 is made into an elastic structure, so that a spring-connected structure is formed between the pressure bevel 6121 and the sealing end face 611, so that the compression spring 6124 can press the pressure bevel 6121 onto the clamping bevel 621, and the sealing end face 611 onto the door leaf 2. On the one hand, it avoids the sealing failure caused by the sealing end face 611 below the pressure bevel 6121 no longer being tightly attached to the door leaf 2 after the pressure bevel 6121 is worn. On the other hand, it ensures the guiding effect of the pressure bevel 6121 along the clamping bevel 621. After the pressure bevel 6121 is worn, the pressure bevel 6121 can still be pressed onto the clamping bevel 621 under the elastic force of the compression spring 6124. Unless the pressure bevel 6121 is completely worn out, the sealing effect can be always guaranteed. The upper end of the vertical slide groove 63 is provided with a sealing slope 631; the angle of the sealing slope 631 is equal to that of the pressing slope 621; the upper end of the vertical portion 613 is provided with a sliding slope 6131 whose angle is complementary to that of the sealing slope 631. The sealing slope 631 and the pressing slope 621 are equal in angle to ensure that the end face of the sealing strip 61 that is about to be attached to the door leaf 2 is always horizontal during the sliding process, so that the sealing strip 61 can be completely attached to the door leaf 2 without bending when it is pressed against the door leaf 2, and the gap between the sealing end face 611 and the door leaf 2 is avoided; the sliding slope 6131 is guided by the sealing slope 631, so that the sealing end face 611 does not rub against the vertical slide groove 63 and the horizontal slide groove 62 during the sliding process, thereby avoiding the wear of the sealing end face 611, improving the service life, and ensuring the sealing effect.

[0052] As a specific embodiment of the present invention, refer to Figure 6 and Figure 7; The driving mechanism 5 includes a connecting pressure block 51, a driving pressure groove 52, a driving pressure block 53, a driving slide groove 54, a driving slider 55, a return spring 56, a driving connecting rod 57, a connecting slider 58 and a pressure assembly 59; the connecting pressure block 51 is connected to the door leaf 2; the driving pressure groove 52 is provided on the door frame 1; the driving pressure block 53 is slidably installed in the driving pressure groove 52; the driving slide groove 54 is symmetrically provided on both sides of the door frame 1; the driving slider 55 is slidably installed in the driving slide groove 54; the return spring 56 is connected between the driving slider 55 and the bottom of the driving slide groove 54; the driving connecting rod 57 is connected to the driving slider 55; the side of the connecting slider 58 is connected to the driving connecting rod 57, and the bottom is connected to the sealing strip 61; the pressure assembly 59 is connected to the connecting slider 58. When the door is opened from a large angle to a small angle, the connecting pressing block 51 rotates with the door leaf 2, and the connecting pressing block 51 will not contact the driving pressing block 53 during this process, ensuring that the sealing strip 61 will not extend when the door is opened at a small angle, preventing people from stepping on the sealing strip 61 when opening the fire door at a small angle to pass through, causing damage to the sealing strip 61; when the fire door is opened from a small angle to a closed state, the connecting pressing block 51 presses the driving pressing block 53, which is pressed by the driving pressing block 53 through the driving slider 55, so that it slides in the driving slide groove 54, thereby driving the sealing strip 61 to slide; when opening the door, the sealing strip 61 is pulled back to the inside of the door frame 1 under the elastic force of the return spring 56, and the whole process is automatic, ensuring that the fire door is in a sealed state as a whole after closing the door, and the sealing effect can be guaranteed whenever a fire occurs; the driving slider 55 here can be provided in multiple pieces, and evenly provided at the upper, middle and lower parts of the door frame 1, to ensure that the sealing strip 61 will not deviate during the sliding process, thereby further improving the sealing effect.

[0053] As a specific embodiment of the present invention, refer to Figure 6 , Figure 7 and Figure 8The driving slider 55 is provided with a contraction slot 551; the contraction slot 551 is a rounded rectangular structure that penetrates the driving slider 55, and buckle portions 5511 are provided at the openings on both sides of the contraction slot 551; the driving connecting rod 57 is slidably installed in the contraction slot 551, and the top of the driving connecting rod 57 is shorter than the vertical portion 613, and a limit buckle 571 is provided on the top. The driving connecting rod 57 slides in the contraction slot 551, and this sliding is a sliding action that combines vertical sliding and horizontal sliding, so that the driving slider 55 can drive the sealing strip 61 to move when sliding, and the top of the driving connecting rod 57 is set to be shorter than the vertical portion 613, so that when the upper and lower sealing strips 61 slide to the position where the sealing end surface 611 fits the door leaf 2, the two sealing strips 61 can be tightly pressed against each other to prevent the existence of a gap between the upper and lower sealing strips 61. The driving block 53 is provided with a pressing inclined surface 531; the angle of the pressing inclined surface 531 is less than 30 degrees; the driving slider 55 is provided with a driving inclined surface 552 whose angle is complementary to the pressing inclined surface 531. During the closing process of the door leaf 2, when the door leaf 2 is about to be completely closed, the driving block 53 starts to slide. At this time, the angle of the pressing inclined surface 531 is reduced as much as possible, so that the driving block 53 only needs to slide a short distance to push out the sealing strip 61, ensuring that the inner circle of the sealing strip 61 completely covers the door gap.

[0054] As a specific embodiment of the present invention, refer to Fig. 9 ; The pressure assembly 59 includes a pressure slot 591, a pressure slider 592 and a pressure spring 593; the pressure slot 591 is opened at the bottom of the driving slot 54; the pressure slider 592 is slidably installed in the pressure slot 591; the pressure spring 593 is connected between the connecting slider 58 and the pressure slider 592. The pressure spring 593 can be used to apply pressure to the connecting slider 58. At this time, under the action of pressure, the pressure-bearing inclined surface 6121 and the sliding inclined surface 6131 on the sealing strip 61 can be pressed against the pressing inclined surface 621 and the sealing inclined surface 631 respectively, so that the connecting slider 58 connected to the sealing mechanism 6 can drive the sealing mechanism 6, so that during the process of opening and closing the door, the sealing mechanism 6 is away from the door leaf 2. After the door leaf 2 is completely closed, the sealing mechanism 6 will fit with the door leaf 2. At the same time, when the pressure slider 592 slides in the pressure groove 591, the pressure groove 591 can limit the pressure slider 592, so as to achieve the purpose of limiting the connecting slider 58 by the pressure slider 592.

[0055] As a specific embodiment of the present invention, refer to Fig.10The clamping mechanism 7 includes an air cavity 71, a clamping channel 72, a clamping piston 73 and an air cavity spring 74; the air cavity 71 is arranged in a circle of the door frame 1; the clamping channel 72 is connected to the air cavity 71, and an exhaust half hole 721 is provided at the outlet position of the clamping channel 72; the clamping piston 73 is slidably installed in the clamping channel 72, and an exhaust half hole 731 is provided at the tail of the clamping piston 73; the air cavity spring 74 is connected to the clamping piston 73. The liquid nitrogen in the air cavity 71 is vaporized, and the pressure exerted by the gas on the pressing piston 73 increases. When the pressure exceeds the limit value (when the set temperature exceeds 60 degrees here, the pressure in the air cavity 71 can cause the air cavity spring 74 to deform), the pressing piston 73 slides, and the pressing piston 73 slides to press the sealing strip 61, so that the sealing strip 61 is pressed against the door leaf 2, thereby further improving the sealing effect; an exhaust hole is formed between the pressing piston 73 and the pressing channel 72 to discharge the vaporized nitrogen, further compressing the sealing strip 61, and the liquid nitrogen will absorb the liquid nitrogen during the vaporization process. A large amount of heat is absorbed to achieve the purpose of rapidly cooling the door leaf 2 and the sealing strip 61, ensuring that the sealing strip 61 will not be deformed under high temperature. Since the sealing strip 61 is made of EPDM rubber, it will expand when the temperature rises to improve the smoke barrier effect, but when the temperature exceeds the specified range, it will crack, resulting in sealing failure. When the temperature is too high, the vaporization of liquid nitrogen will absorb the heat around the sealing strip 61, helping the sealing strip 61 to cool down, which can ensure that the sealing strip 61 will not crack, thereby further improving the sealing effect.

[0056] Workflow: Reference Figure 3 , Fig.11 , Fig.12 and Fig.13 When the door leaf 2 is opened, the sealing strip 61 shrinks into the door frame 1; Fig.12 When the door leaf 2 is closed, the connecting pressing block 51 squeezes the driving pressing block 53, and the driving pressing block 53 squeezes the driving slider 55. The driving slider 55 slides to drive the sealing strip 61 to slide obliquely, extending from the door frame 1 to close the gap between the door frame 1 and the door leaf 2, and at the same time pressing against the door leaf 2.

[0057] Specifically, the door leaf 2 is in the process of opening and closing at a small angle to a fully closed state; Fig.12 The door leaf 2 rotates to drive the connecting pressure block 51 to rotate. The connecting pressure block 51 rotates to contact the driving pressure block 53 and presses the driving pressure block 53. The driving pressure block 53 slides in the driving pressure groove 52 under the pressing action of the connecting pressure block 51. The pressing inclined surface 531 on the driving pressure block 53 and the driving inclined surface 552 on the driving slider 55 squeeze each other, so that the driving slider 55 slides and the reset spring 56 is stretched. At this time, the driving slider 55 slides horizontally and drives the driving connecting rod 57 to slide horizontally, thereby achieving the purpose of driving the sealing strip 61 to slide horizontally.

[0058] Reference Fig. 9 , Fig.13 , Fig.14 and Fig.15 During the horizontal sliding of the sealing strip 61, due to the pressure of the pressure spring 593, the compressed inclined surface 6121 and the sliding inclined surface 6131 on the sealing strip 61 can be respectively pressed against the pressing inclined surface 621 and the sealing inclined surface 631, and the sealing end surface 611 is away from the door leaf 2. Therefore, under the guidance of the pressing inclined surface 621 and the sealing inclined surface 631, the sealing strip 61 moves from the rear of the door frame 1 toward the door leaf 2, so that the sealing end surface 611 does not contact the door leaf 2 during the movement of the sealing strip 61. When the door leaf 2 is fully closed, the sealing strip 61 moves to the position where the sealing end surface 611 is completely in contact with the door leaf 2.

[0059] During the movement of the sealing strip 61 in the above two directions, the sliding slope 6122 on the transverse portion 612 of the sealing strip 61 moves relative to the sealing slope 622 on the horizontal slide groove 62, and under the guidance of the sealing slope 622, the transverse portion 612 slides in the vertical direction. At the same time, the pressure slider 592 ensures that the vertical portion 613 slides vertically in the same manner as the transverse portion 612 under the guidance of the pressure slide groove 591, thereby ensuring a smooth sliding process of the sealing strip 61. After the sealing is completed, the sealing end face 611 is flat, thereby ensuring the sealing effect.

[0060] When a fire occurs, the liquid nitrogen in the air cavity 71 vaporizes, and the pressure exerted by the liquid nitrogen gas on the clamping piston 73 increases. When the pressure exceeds the limit value, the clamping piston 73 slides, and the sliding of the clamping piston 73 compresses the sealing strip 61, so that the sealing strip 61 is pressed against the door leaf 2, thereby further improving the sealing effect; and when sliding to the clamping state, the exhaust half hole 2 731 on the clamping piston 73 and the exhaust half hole 1 721 on the clamping channel 72 cooperate to form an exhaust hole to discharge the vaporized nitrogen to further compress the sealing strip 61, and the liquid nitrogen can absorb the heat near the sealing strip 61 during the vaporization process, so as to achieve the purpose of rapidly cooling the door leaf 2 and the sealing strip 61, and ensure that the sealing strip 61 will not be cracked under the action of high temperature, and at the same time, the heat around the door frame 1 is absorbed and cooled to improve the insulation effect.

[0061] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected, and the scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. A fireproof door with a smoke and dust barrier structure, comprising a door frame (1), a door leaf (2), a hinge (3) and a door closer (4), characterized in that: The door also comprises a driving mechanism (5), a sealing mechanism (6) and a pressing mechanism (7); the driving mechanism (5) is connected to the door frame (1); the sealing mechanism (6) is connected to the door frame (1); the pressing mechanism (7) is connected to the driving mechanism (5); when the door leaf (2) is closed, the driving mechanism (5) is pressed, the driving mechanism (5) slides under pressure, the driving mechanism (5) slides and pushes the sealing mechanism (6), so that the sealing mechanism (6) slides from the door frame (1) to the gap between the door frame (1) and the door leaf (2); when the temperature rises to a value exceeding a limit, the liquid in the pressing mechanism (7) vaporizes and causes the pressing mechanism (7) to slide, and the pressing mechanism (7) slides to press the sealing mechanism (6) onto the door leaf (2); The sealing mechanism (6) comprises a sealing strip (61), a horizontal slide groove (62) and a vertical slide groove (63); the sealing strip (61) is connected to the driving mechanism (5), the sealing strip (61) is an L-shaped structure, and a total of four sealing strips (61) are provided, and the side of the sealing strip (61) facing the door leaf (2) is a sealing end surface (611); the horizontal slide groove (62) is symmetrically arranged on the left and right sides of the door frame (1); the vertical slide groove (63) is symmetrically arranged on the upper and lower sides of the door frame (1); The horizontal slide groove (62) is provided with a pressing slope (621) at the top and a sealing slope (622) at the bottom; the sealing strip (61) further comprises a transverse portion (612) and a vertical portion (613); the transverse portion (612) is slidably mounted in the horizontal slide groove (62); the upper end of the transverse portion (612) is provided with a pressure-bearing slope (6121) having an angle complementary to that of the pressing slope (621); the bottom surface of the transverse portion (612) is provided with a sliding slope (6122) having an angle complementary to that of the sealing slope (622); the vertical portion (613) is slidably mounted in the vertical slide groove (63); A spring clamping groove (6123) is provided below the pressure-bearing inclined surface (6121); a compression spring (6124) is provided in the spring clamping groove (6123); The driving mechanism (5) comprises a connecting pressure block (51), a driving pressure groove (52), a driving pressure block (53), a driving slide groove (54), a driving slider (55), a return spring (56), a driving connecting rod (57), a connecting slider (58) and a pressure assembly (59); the connecting pressure block (51) is connected to the door leaf (2); the driving pressure groove (52) is formed on the door frame (1); the driving pressure block (53) is slidably mounted in the driving pressure groove (52); the driving slide The grooves (54) are symmetrically arranged on both sides of the door frame (1); the driving slider (55) is slidably mounted in the driving slider (54); the return spring (56) is connected between the driving slider (55) and the bottom of the driving slider (54); the driving connecting rod (57) is connected to the driving slider (55); the side of the connecting slider (58) is connected to the driving connecting rod (57), and the bottom is connected to the sealing strip (61); the pressure assembly (59) is connected to the connecting slider (58); The clamping mechanism (7) comprises an air cavity (71), a clamping channel (72), a clamping piston (73) and an air cavity spring (74); the air cavity (71) is arranged around the door frame (1), and liquid nitrogen is stored in the air cavity (71); the clamping channel (72) is connected to the air cavity (71), and an exhaust half hole (721) is provided at the outlet of the clamping channel (72), and the outlet of the clamping channel (72) faces the sealing strip (61); the clamping piston (73) is slidably mounted in the clamping channel (72), and an exhaust half hole (731) is provided at the rear of the clamping piston (73); and the air cavity spring (74) is connected to the clamping piston (73).

2. The fire door with smoke and dust barrier structure according to claim 1, characterized in that: A sealing inclined surface (631) is provided at the upper end of the vertical slide groove (63); the angle of the sealing inclined surface (631) is equal to that of the pressing inclined surface (621); and a sliding inclined surface (6131) having a complementary angle to that of the sealing inclined surface (631) is provided at the upper end of the vertical portion (613).

3. The fire door with smoke and dust barrier structure according to claim 1, characterized in that: The driving slider (55) is provided with a contraction slide groove (551); the contraction slide groove (551) is a rounded rectangular structure that passes through the driving slider (55), and buckle portions (5511) are provided at opening positions on both sides of the contraction slide groove (551); the driving connecting rod (57) is slidably installed in the contraction slide groove (551), and the top of the driving connecting rod (57) is shorter than the vertical portion (613), and a limit buckle (571) is provided on the top.

4. The fire door with smoke and dust barrier structure according to claim 3, characterized in that: The driving pressure block (53) is provided with a pressing inclined surface (531); the angle of the pressing inclined surface (531) is less than 30 degrees; and the driving slider (55) is provided with a driving inclined surface (552) having a complementary angle to the pressing inclined surface (531).

5. The fire door with smoke and dust barrier structure according to claim 1, characterized in that: The pressure assembly (59) comprises a pressure slide groove (591), a pressure slider (592) and a pressure spring (593); the pressure slide groove (591) is opened at the bottom of the driving slide groove (54); the pressure slider (592) is slidably installed in the pressure slide groove (591); and the pressure spring (593) is connected between the connecting slider (58) and the pressure slider (592).

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