Corridor fireproof door

Abstract

The invention belongs to the technical field of fireproof doors, and particularly relates to a corridor fireproof door which comprises a door frame, an auxiliary door and a fireproof opening and closing door, the auxiliary door and the fireproof opening and closing door are rotationally installed in the door frame, a bottom hidden type sealing piece is installed at the bottom of the door frame and installed in the ground, and the bottom hidden type sealing piece comprises a hidden type bottom frame. A sealing bottom strip is installed in the hidden bottom frame in a sliding mode, a bottom sealing strip is fixedly installed at the upper end of the sealing bottom strip, the slope strip is located between the L-shaped sealing strip and the fireproof opening and closing door, namely, the L-shaped sealing strip is protected, and the sealing bottom strip and the bottom sealing strip are installed in the hidden bottom frame. The bottom sealing strip located in the ground cannot be treaded, namely, the bottom sealing strip cannot be damaged, the integrity of the bottom sealing strip and the L-shaped sealing strip is guaranteed, and the situation that the sealing performance of the corridor fireproof door is affected due to damage of the bottom sealing strip and the L-shaped sealing strip is avoided.

Description

Technical Field

[0001] The invention belongs to the field of fire doors, in particular to a corridor fire door. Background Art

[0002] A corridor fire door refers to a door that can meet the requirements of fire resistance stability, integrity and thermal insulation within a certain period of time. It is usually installed on fire partitions with a certain fire resistance, such as fire compartments and evacuation stairwells. It is used to isolate the fire source, prevent the spread of fire and smoke, and provide safety for personnel evacuation and fire rescue. In the existing technology, in order to improve the sealing effect of blocking smoke and dust, a fixed sealing strip is installed on the door frame or door panel.

[0003] The setting of fixed sealing strips can effectively increase the sealing of fire doors to better block smoke and dust. However, corridor fire doors are usually set in aisles, and people often pass through the corridor fire doors. As people walk, the sealing strips at the bottom and exposed to the outside will be constantly squeezed and worn due to stepping on. When people carry goods, the goods may not only scratch the bottom sealing strips, but also the sealing strips on the door frames of the fire doors may be scratched by the goods, resulting in a decrease in its sealing performance and affecting the barrier effect against smoke and dust.

[0004] To this end, the present invention provides a corridor fire door. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a corridor fire door described in the present invention comprises a door frame, a secondary door and a fireproof opening and closing door rotatably installed inside the door frame, an L-shaped strip is installed on the outer side of the fireproof opening and closing door, and a door frame seal is fixedly installed inside the door frame, the door frame seal comprises an L-shaped door frame strip and an L-shaped sealing strip fixedly installed on one side of the L-shaped door frame strip, the L-shaped door frame strip is connected to the inner wall of the door frame, a first blocking strip is slidably installed inside the door frame, and a second blocking strip is slidably installed inside the secondary door, and the first blocking strip and the second blocking strip are located between the fireproof opening and closing door and the door frame seal;

[0007] A bottom hidden seal is installed at the bottom of the door frame, the bottom hidden seal is installed inside the ground, the uppermost end of the bottom hidden seal is at the same horizontal height as the ground, the bottom hidden seal includes a hidden bottom frame, a mounting groove is opened inside the hidden bottom frame, a sealing bottom strip is slidably installed inside the mounting groove, and a bottom sealing strip is fixedly installed at the upper end of the sealing bottom strip;

[0008] The first blocking bar comprises a sliding bar movably mounted inside the door frame and an inclined bar fixedly mounted on the lower side of the sliding bar.

[0009] Preferably, the first blocking bar and the second blocking bar are components made of the same structure, the first blocking bar is installed inside the door frame to be lifted up and down, and the second blocking bar is installed inside the auxiliary door to be slid left and right.

[0010] Preferably, a plurality of connecting springs are fixedly installed on the upper side of the sliding bar, one end of each of the connecting springs is fixedly connected to the inside of the door frame, and a plurality of rolling balls are movably installed inside both sides of the sliding bar, and each of the rolling balls is in contact with the inside of the door frame.

[0011] Preferably, a first magnetic strip is fixedly installed on the inner bottom of the fireproof opening and closing door, and a second magnetic strip is fixedly installed on the inner top of the sealing bottom strip, and the first magnetic strip and the second magnetic strip are magnetically connected.

[0012] Preferably, a sealing strip component is fixedly installed on the inner bottom of the installation groove, and the sealing strip component is located directly below the sealing bottom strip. The sealing strip component is a component composed of multiple bottom sealing strips.

[0013] Preferably, an arc-shaped bar is fixedly installed on one side of the hidden bottom frame, an air inlet opening is opened inside the arc-shaped bar, a connecting groove is opened inside the installation groove, the connecting groove is connected with the air inlet opening, and the horizontal height of the top end of the arc-shaped bar is consistent with the horizontal height of the ground.

[0014] Preferably, a plurality of rising grooves and limiting grooves are fixedly provided on the inner walls on both sides of the installation groove, and the rising grooves and the limiting grooves are connected.

[0015] Preferably, a limiting column is movably installed inside the rising groove, and a plurality of the limiting columns are installed on both sides of the sealing bottom strip.

[0016] Preferably, two arc grooves are fixedly provided inside the limiting column, an arc spring piece is movably installed inside the arc groove, a plurality of spring guide pillars are fixedly installed on one side of the arc spring piece facing the arc groove, and the plurality of spring guide pillars are movably installed inside the arc groove.

[0017] Preferably, the maximum distance between the two arc-shaped spring pieces is greater than the width of the rising groove, and the minimum distance between the two arc-shaped spring pieces is less than the width of the rising groove.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. A corridor fire door described in the present invention is exposed in the passage space of the door frame through the inclined strips corresponding to the first obstruction strip and the second obstruction strip, and the inclined strip is located between the L-shaped sealing strip and the fireproof opening and closing door, that is, the L-shaped sealing strip is protected. When goods are transported, the inclined strip is at most touched, and the protected L-shaped sealing strip will not be directly scratched. The sealing bottom strip and the bottom sealing strip are installed inside the hidden bottom frame, and the horizontal height of the bottom sealing strip is lower than the horizontal height of the ground. When people pass through the door frame, they cannot step on the bottom sealing strip inside the ground, that is, they cannot cause damage to the bottom sealing strip, thereby ensuring the integrity of the bottom sealing strip and the L-shaped sealing strip, and avoiding the damage of the bottom sealing strip and the L-shaped sealing strip affecting the sealing of the corridor fire door.

[0020] 2. A corridor fire door described in the present invention is driven to rise through the sealing bottom strip and the limit column, resulting in the bottom sealing strip contacting the lower side of the fireproof opening and closing door. The limit column will enter the limit groove from the rising groove. Because the diameter of the limit groove is larger than the width of the rising groove, the arc-shaped spring piece will move away from the arc groove under the extension of the spring guide column until it contacts the inner wall of the limit groove, that is, multiple limit columns are limited inside the limit groove, and the bottom sealing strip is also fixed to the lower side of the fireproof opening and closing door, thereby enhancing the sealing performance.

[0021] 3. A corridor fire door described in the present invention can greatly reduce the distance between the fireproof opening and closing door and the L-shaped door frame strip through the expansion of the L-shaped sealing strip after burning, so that smoke cannot pass through the distance between the fireproof opening and closing door and the L-shaped door frame strip. The arrangement of the arc strip can allow fire to burn to the sealing strip component through the air inlet opening and the connecting groove. The sealing strip component will expand after burning and fill the lower end of the installation groove, thereby generating an upward jacking force on the sealing bottom strip, so that the bottom sealing strip is in closer contact with the lower side of the fireproof opening and closing door. After the bottom sealing strip burns and expands, the distance between the sealing bottom strip and the lower side of the fireproof opening and closing door is greatly reduced, so that smoke cannot pass through the distance between the sealing bottom strip and the lower side of the fireproof opening and closing door. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] Figure 1 It is an overall stereogram of the present invention;

[0024] Figure 2 is a three-dimensional schematic diagram of a door frame seal in the present invention;

[0025] Figure 3 It is a three-dimensional schematic diagram of an L-shaped door frame strip and an L-shaped sealing strip in the present invention;

[0026] Figure 4 is a three-dimensional schematic diagram of the first barrier strip and the second barrier strip in the present invention;

[0027] Figure 5 It is a three-dimensional schematic diagram of the sliding bar and the inclined surface in the present invention;

[0028] Figure 6 It is a three-dimensional schematic diagram of the bottom hidden seal in the present invention;

[0029] Figure 7 It is a three-dimensional schematic diagram of the arc strip in the present invention;

[0030] Figure 8 It is a three-dimensional schematic diagram of the rising groove and the limiting groove in the present invention;

[0031] Fig. 9 It is a three-dimensional schematic diagram of the limiting column in the present invention.

[0032] In the figure: 1. fireproof opening and closing door; 11. L-shaped strip; 12. first magnetic strip; 2. door frame; 21. first blocking strip; 211. sliding strip; 212. inclined strip; 213. rolling ball; 214. connecting spring; 3. auxiliary door; 31. second blocking strip; 4. bottom hidden seal; 41. hidden bottom frame; 411. installation groove; 412. rising groove; 413. limiting groove; 42. bottom sealing strip; 43. sealing bottom strip; 44. second magnetic strip; 45. sealing strip component; 46. arc strip; 461. air inlet opening; 462. connecting groove; 47. limiting column; 471. arc groove; 472. spring guide column; 473. arc spring piece; 5. door frame seal; 51. L-shaped door frame strip; 52. L-shaped sealing strip. DETAILED DESCRIPTION

[0033] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0034] Embodiment 1

[0035] like Figure 1-6 As shown, a corridor fire door according to an embodiment of the present invention comprises a door frame 2, a secondary door 3 and a fireproof opening and closing door 1 rotatably mounted inside the door frame 2, an L-shaped strip 11 is mounted on the outer side of the fireproof opening and closing door 1, and a door frame seal 5 is also fixedly mounted inside the door frame 2, the door frame seal 5 comprises an L-shaped door frame strip 51 and an L-shaped sealing strip 52 fixedly mounted on one side of the L-shaped door frame strip 51, the L-shaped door frame strip 51 is connected to the inner wall of the door frame 2, a first blocking strip 21 is slidably mounted inside the door frame 2, a second blocking strip 31 is slidably mounted inside the secondary door 3, and the first blocking strip 21 and the second blocking strip 31 are located between the fireproof opening and closing door 1 and the door frame seal 5;

[0036] A bottom hidden seal 4 is installed at the bottom of the door frame 2. The bottom hidden seal 4 is installed inside the ground. The uppermost end of the bottom hidden seal 4 is at the same horizontal height as the ground. The bottom hidden seal 4 includes a hidden bottom frame 41. An installation groove 411 is provided inside the hidden bottom frame 41. A sealing bottom strip 43 is slidably installed inside the installation groove 411. A bottom sealing strip 42 is fixedly installed at the upper end of the sealing bottom strip 43.

[0037] The first blocking bar 21 includes a sliding bar 211 movably mounted inside the door frame 2 and an inclined bar 212 fixedly mounted on the lower side of the sliding bar 211 .

[0038] Specifically, when the fireproof opening and closing door 1 is in the open state, personnel can pass through the passage space of the door frame 2, and the inclined strips 212 corresponding to the first blocking strips 21 and the second blocking strips 31 are exposed in the passage space of the door frame 2. The inclined strips 212 are located between the L-shaped sealing strip 52 and the fireproof opening and closing door 1, that is, the L-shaped sealing strip 52 is protected. When the goods are transported, the inclined strips 212 are touched at most, and the protected L-shaped sealing strip 52 will not be directly scratched. The sealing bottom strip 43 and the bottom sealing strip 42 are installed inside the hidden bottom frame 41. The horizontal height of the bottom sealing strip 42 is lower than the horizontal height of the ground. When personnel pass through the door frame 2, the bottom sealing strip 42 inside the ground cannot be stepped on, that is, the bottom sealing strip 42 cannot be damaged, thereby ensuring the integrity of the bottom sealing strip 42 and the L-shaped sealing strip 52, and avoiding that the damage to the bottom sealing strip 42 and the L-shaped sealing strip 52 affects the sealing of the corridor fire door. When the fireproof opening and closing door 1 is rotated to make it in close contact with the door frame 2, that is, the fireproof opening and closing door 1 is in a closed state after rotation, and the door frame 2 prohibits people from passing through. During the rotation of the fireproof opening and closing door 1 toward the door frame 2, the fireproof opening and closing door 1 will contact the inclined surface 212, because the side of the inclined surface 212 that contacts the fireproof opening and closing door 1 is inclined. When the fireproof opening and closing door 1 continues to rotate toward the door frame 2, the inclined strip 212 will be squeezed, so that the inclined strip 212 and the inclined strip 212 will slide into the corresponding door frame 2 or auxiliary door 3, and the side of the fireproof opening and closing door 1 will eventually be in close contact with the L-shaped sealing strip 52, and the sealing performance of the door frame 2 and the fireproof opening and closing door 1 will be enhanced by the L-shaped sealing strip 52. When the fireproof opening and closing door 1 is rotated to open, the inclined strip 212 will pop out to protect the L-shaped sealing strip 52. A magnetic structure is provided between the bottom of the fireproof opening and closing door 1 and the sealing bottom strip 43. When the fireproof opening and closing door 1 is located directly above the sealing bottom strip 43, the sealing bottom strip 43 is pressed against the fireproof opening and closing door 1. 3 rises under the attraction of the magnetic force at the bottom of the fireproof opening and closing door 1, that is, the bottom sealing strip 42 will be tightly attached to the lower side of the fireproof opening and closing door 1, providing sealing for the bottom of the fireproof opening and closing door 1, that is, when the fireproof opening and closing door 1 is in an open state, it is difficult for people passing by to step on the bottom sealing strip 42. When people carry goods, under the protection of the first blocking strip 21 and the second blocking strip 31, the goods will not directly contact with the L-shaped sealing strip 52 and cause damage to it, thereby ensuring the integrity of the L-shaped sealing strip 52 and the bottom sealing strip 42. After the fireproof opening and closing door 1 is closed, the L-shaped sealing strip 52 and the bottom sealing strip 42 provide good sealing for it.

[0039] like Figure 4-5As shown, the first obstruction bar 21 and the second obstruction bar 31 are components made of the same structure. The first obstruction bar 21 is installed inside the door frame 2 for lifting and lowering, and the second obstruction bar 31 is installed inside the auxiliary door 3 for sliding left and right. A plurality of connecting springs 214 are fixedly installed on the upper side of the sliding bar 211, and one end of the plurality of connecting springs 214 is fixedly connected to the inside of the door frame 2. A plurality of rolling balls 213 are movably installed inside the two sides of the sliding bar 211, and the plurality of rolling balls 213 are in contact with the inside of the door frame 2.

[0040] Specifically, the connecting spring 214 is in a natural state, and the inclined strip 212 is located in the passage space of the door frame 2. When the fireproof opening and closing door 1 squeezes the inclined strip 212, it will cause the inclined strip 212 to move, that is, the connecting spring 214 changes from a natural state to a compressed state. At this time, the first blocking strip 21 rises inside the door frame 2, and the second blocking strip 31 moves inside the auxiliary door 3 in a direction away from the fireproof opening and closing door 1. When the fireproof opening and closing door 1 is in an open state, the connecting spring 214 changes from a compressed state to a natural state, and the inclined strips 212 of the first blocking strip 21 and the second blocking strip 31 are exposed in the passage space of the door frame 2. At this time, the first blocking strip 21 and the second blocking strip 31 protect the L-shaped sealing strip 52, and the provision of multiple rolling balls 213 allows the first blocking strip 21 and the second blocking strip 31 to be squeezed and moved more easily.

[0041] like Figure 1 and Figure 6 As shown, a first magnetic strip 12 is fixedly installed on the inner bottom of the fireproof opening and closing door 1, and a second magnetic strip 44 is fixedly installed on the inner top of the sealing bottom strip 43. The first magnetic strip 12 and the second magnetic strip 44 are magnetically connected.

[0042] Specifically, after the fireproof opening and closing door 1 is rotated so that the first magnetic strip 12 is directly above the sealing bottom strip 43, the second magnetic strip 44 is affected by the magnetic force of the first magnetic strip 12, causing the sealing bottom strip 43 and the bottom sealing strip 42 to rise as a whole until the bottom sealing strip 42 fits tightly against the lower side of the fireproof opening and closing door 1, so that the entire corridor fire door is in a sealed closed state.

[0043] like Figure 8 As shown, multiple rising grooves 412 and limiting grooves 413 are fixedly opened on the inner walls of both sides of the installation groove 411. The rising grooves 412 and the limiting grooves 413 are connected. Limiting columns 47 are movably installed inside the rising grooves 412. Multiple limiting columns 47 are installed on both sides of the sealing bottom strip 43.

[0044] Specifically, the sealing bottom strip 43 is raised and lowered inside the installation groove 411 by the guidance of multiple limiting columns 47. When the limiting columns 47 move from the rising groove 412 to the inside of the limiting groove 413, the sealing bottom strip 43 is locked. At this time, the uppermost horizontal height of the bottom sealing strip 42 is higher than the horizontal height of the ground, thereby improving the stability of the sealing bottom strip 43.

[0045] like Fig. 9 As shown, two arc grooves 471 are fixedly provided inside the limiting column 47, an arc spring piece 473 is movably installed inside the arc groove 471, a plurality of spring guide pillars 472 are fixedly installed on the side of the arc spring piece 473 facing the arc groove 471, and a plurality of spring guide pillars 472 are movably installed inside the arc groove 471, the maximum spacing between the two arc spring pieces 473 is greater than the width of the rising groove 412, and the minimum spacing between the two arc spring pieces 473 is less than the width of the rising groove 412.

[0046] Specifically, the sealing bottom strip 43 rises through magnetic force until the bottom sealing strip 42 contacts the lower side of the fireproof opening and closing door 1. When a fire occurs, high temperature will act on the fireproof opening and closing door 1. In a high temperature environment, the magnetic force will weaken, causing the sealing bottom strip 43 and the first magnetic attraction strip 12 to weaken and then separate. In this device, when the sealing bottom strip 43 and its limiting column 47 are driven to rise, causing the bottom sealing strip 42 to contact the lower side of the fireproof opening and closing door 1, the limiting column 47 will enter the limiting groove 413 from the rising groove 412. Because the diameter of the limiting groove 413 is larger than the width of the rising groove 412, the arc-shaped spring piece 473 will move away from the arc-shaped groove 471 under the extension of the spring guide column 472 until it contacts the inner wall of the limiting groove 413, that is, multiple limiting columns 47 are limited. Located inside the limiting groove 413, even if the magnetic force weakens, the bottom sealing strip 42 is fixed to the lower side of the fireproof opening and closing door 1. When the fireproof opening and closing door 1 is in the open state, because the limiting column 47 is inside the limiting groove 413, the horizontal height of the bottom sealing strip 42 is greater than the horizontal height of the ground. By stepping lightly with the foot, a downward pressure is applied to the entire sealing bottom strip 43, so that the multiple spring guide columns 472 shrink, and the arc-shaped spring piece 473 is re-embedded into the limiting column 47. The limiting column 47 can then descend from the limiting groove 413 to the rising groove 412, that is, the sealing bottom strip 43 drives the bottom sealing strip 42 to descend until the horizontal height of the bottom sealing strip 42 is lower than the horizontal height of the ground, and the bottom sealing strip 42 is hidden inside the ground and will no longer be damaged by stepping on it.

[0047] Embodiment 2

[0048] like Figure 6-7As shown, compared with Example 1, another implementation of the present invention is: a sealing strip component 45 is fixedly installed on the inner bottom of the installation groove 411, and the sealing strip component 45 is located directly below the sealing bottom strip 43. The sealing strip component 45 is a component composed of multiple bottom sealing strips 42. An arc strip 46 is fixedly installed on one side of the hidden bottom frame 41, and an air intake opening 461 is opened through the arc strip 46. A connecting groove 462 is opened in the installation groove 411, and the connecting groove 462 is connected to the air intake opening 461. The horizontal height of the top of the arc strip 46 is consistent with the horizontal height of the ground.

[0049] Specifically, the L-shaped sealing strip 52, the bottom sealing strip 42 and the sealing strip component 45 in the device as the sealing structure of the fire door have a characteristic that they will expand after burning. When a fire occurs, the L-shaped sealing strip 52 expands after being burned, greatly reducing the distance between the fireproof opening and closing door 1 and the L-shaped door frame strip 51, so that smoke cannot pass through the distance between the fireproof opening and closing door 1 and the L-shaped door frame strip 51. The setting of the arc strip 46 allows the fire to burn through the air inlet opening 461 and the connecting groove 462. When the fire retardant is in the air, the fire retardant is put into the airtight container 42. The fire retardant is put into the airtight container 42. The fire retardant is put into the airtight container 42. The fire retardant is put into the airtight container 42. The fire retardant is put into the airtight container 42. The fire retardant is put into the airtight container 42. The fire retardant is put into the airtight container 42.

[0050] Working principle: When the fireproof opening and closing door 1 is in the open state, personnel can pass through the passage space of the door frame 2, and the inclined strips 212 corresponding to the first blocking strip 21 and the second blocking strip 31 are exposed in the passage space of the door frame 2. The inclined strips 212 are located between the L-shaped sealing strip 52 and the fireproof opening and closing door 1, that is, the L-shaped sealing strip 52 is protected. When goods are transported, the inclined strips 212 are touched at most, and the protected L-shaped sealing strip 52 will not be directly scratched. The sealing bottom strip 43 and the bottom sealing strip 42 are installed inside the hidden bottom frame 41. The horizontal height of the bottom sealing strip 42 is lower than the horizontal height of the ground. When personnel pass through the door frame 2, they cannot step on the bottom sealing strip 42 inside the ground, that is, they cannot cause damage to the bottom sealing strip 42. The fireproof door 1 is in a closed state after rotation, and the door frame 2 prohibits personnel from passing through. In the process of the fireproof door 1 rotating toward the door frame 2, the fireproof door 1 will contact the inclined strip 212, because the side of the inclined strip 212 in contact with the fireproof door 1 is inclined. When the fireproof door 1 continues to rotate toward the door frame 2, the inclined strip 212 will be squeezed, and then the inclined strip 212 and the inclined strip 212 will slide into the corresponding door frame 2 or auxiliary door 3. The surface will eventually be in close contact with the L-shaped sealing strip 52, and the sealing performance of the door frame 2 and the fireproof opening and closing door 1 will be enhanced by the L-shaped sealing strip 52. When the fireproof opening and closing door 1 is rotated and opened, the inclined surface 212 will pop out to protect the L-shaped sealing strip 52. A magnetic structure is arranged between the bottom of the fireproof opening and closing door 1 and the sealing bottom strip 43. When the fireproof opening and closing door 1 is in a position directly above the sealing bottom strip 43, the sealing bottom strip 43 rises under the attraction of the magnetic force at the bottom of the fireproof opening and closing door 1, that is, the bottom sealing strip 42 will fit tightly to the lower side of the fireproof opening and closing door 1, providing sealing performance for the bottom of the fireproof opening and closing door 1, that is, when the fireproof opening and closing door 1 is in an open state, it is difficult for people passing through to step on the bottom sealing strip 42, and when people carry goods through, they can step on the first obstruction strip 43. 21 and the second barrier strip 31, the cargo will not directly contact the L-shaped sealing strip 52 and cause damage to it, thereby ensuring the integrity of the L-shaped sealing strip 52 and the bottom sealing strip 42. After the fireproof opening and closing door 1 is closed, the L-shaped sealing strip 52 and the bottom sealing strip 42 provide good sealing for it. In this device, the L-shaped sealing strip 52, the bottom sealing strip 42 and the sealing strip component 45 serve as the sealing structure of the fireproof door, and there is a characteristic that they will expand after burning. When a fire occurs, the L-shaped sealing strip 52 expands after being burned, greatly reducing the distance between the fireproof opening and closing door 1 and the L-shaped door frame strip 51, so that smoke cannot pass through the distance between the fireproof opening and closing door 1 and the L-shaped door frame strip 51. The setting of the arc strip 46,The fire can be allowed to burn to the sealing strip component 45 through the air inlet opening 461 and the connecting groove 462. The sealing strip component 45 expands after burning and fills the lower end of the installation groove 411, thereby generating an upward force on the sealing bottom strip 43, so that the bottom sealing strip 42 is in closer contact with the lower side of the fireproof opening and closing door 1. After the bottom sealing strip 42 burns and expands, the distance between the sealing bottom strip 43 and the lower side of the fireproof opening and closing door 1 is greatly reduced, so that smoke cannot pass through the distance between the sealing bottom strip 43 and the lower side of the fireproof opening and closing door 1, thereby enhancing the sealing of the corridor fire door and reducing smoke leakage.

[0051] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. 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. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A corridor fire door, comprising a door frame (2), a secondary door (3) and a fireproof opening and closing door (1) rotatably mounted inside the door frame (2), an L-shaped strip (11) being mounted on the outer side of the fireproof opening and closing door (1), a door frame seal (5) being fixedly mounted inside the door frame (2), the door frame seal (5) comprising an L-shaped door frame strip (51) and an L-shaped sealing strip (52) fixedly mounted on one side of the L-shaped door frame strip (51), the L-shaped door frame strip (51) being connected to the inner wall of the door frame (2), characterized in that: A first blocking strip (21) is slidably mounted inside the door frame (2), and a second blocking strip (31) is slidably mounted inside the auxiliary door (3), wherein the first blocking strip (21) and the second blocking strip (31) are located between the fireproof opening and closing door (1) and the door frame sealing member (5); A bottom hidden seal (4) is installed at the bottom of the door frame (2), the bottom hidden seal (4) is installed inside the ground, the uppermost end of the bottom hidden seal (4) is at the same horizontal height as the ground, the bottom hidden seal (4) comprises a hidden bottom frame (41), a mounting groove (411) is provided inside the hidden bottom frame (41), a sealing bottom strip (43) is slidably installed inside the mounting groove (411), and a bottom sealing strip (42) is fixedly installed at the upper end of the sealing bottom strip (43); The first blocking bar (21) comprises a sliding bar (211) movably mounted inside the door frame (2) and an inclined bar (212) fixedly mounted on the lower side of the sliding bar (211).

2. A corridor fire door according to claim 1, characterized in that: The first blocking bar (21) and the second blocking bar (31) are components made of the same structure; the first blocking bar (21) is installed inside the door frame (2) to be lifted up and down, and the second blocking bar (31) is installed inside the auxiliary door (3) to be slidable left and right.

3. A corridor fire door according to claim 2, characterized in that: A plurality of connecting springs (214) are fixedly mounted on the upper side of the sliding bar (211), one end of each of the connecting springs (214) is fixedly connected to the interior of the door frame (2), and a plurality of rolling balls (213) are movably mounted on both sides of the sliding bar (211), and the plurality of rolling balls (213) are in contact with the interior of the door frame (2).

4. A corridor fire door according to claim 1, characterized in that: A first magnetic strip (12) is fixedly mounted on the inner bottom of the fireproof opening and closing door (1), a second magnetic strip (44) is fixedly mounted on the inner top of the sealing bottom strip (43), and the first magnetic strip (12) and the second magnetic strip (44) are magnetically connected.

5. A corridor fire door according to claim 1, characterized in that: A sealing strip component (45) is fixedly installed on the inner bottom of the installation groove (411). The sealing strip component (45) is located directly below the sealing bottom strip (43). The sealing strip component (45) is a component assembled by combining multiple bottom sealing strips (42).

6. A corridor fire door according to claim 1, characterized in that: A curved strip (46) is fixedly mounted on one side of the hidden bottom frame (41); an air inlet opening (461) is provided through the curved strip (46); a connecting groove (462) is provided inside the mounting groove (411); the connecting groove (462) is connected to the air inlet opening (461); and the top end of the curved strip (46) is at the same level as the ground.

7. A corridor fire door according to claim 1, characterized in that: A plurality of rising grooves (412) and limiting grooves (413) are fixedly provided on the inner walls on both sides of the installation groove (411), and the rising grooves (412) and limiting grooves (413) are connected.

8. A corridor fire door according to claim 7, characterized in that: A limiting column (47) is movably installed inside the rising groove (412), and a plurality of the limiting columns (47) are installed on both sides of the sealing bottom strip (43).

9. A corridor fire door according to claim 8, characterized in that: Two arc-shaped grooves (471) are fixedly provided inside the limiting column (47), an arc-shaped spring sheet (473) is movably installed inside the arc-shaped groove (471), and a plurality of spring guide columns (472) are fixedly installed on one side of the arc-shaped spring sheet (473) facing the arc-shaped groove (471), and the plurality of spring guide columns (472) are movably installed inside the arc-shaped groove (471).

10. A corridor fire door according to claim 9, characterized in that: The maximum distance between the two arc-shaped spring pieces (473) is greater than the width of the rising groove (412), and the minimum distance between the two arc-shaped spring pieces (473) is less than the width of the rising groove (412).

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