A smoke vent

Abstract

The application provides a smoke exhaust window, comprising: a fixed frame; a first window sash and a second window sash, the bottom of the first window sash is rotationally connected with the bottom end of the fixed frame, the bottom of the second window sash is rotationally connected with the top of the first window sash through a plurality of damping hinge pieces, and the top of the second window sash is rotationally and slidingly connected with the fixed frame; a control locking piece is arranged on the first window sash and the fixed frame; the damping hinge piece comprises a pin shaft and a first blade, a second blade and a damping assembly which are arranged on the pin shaft, the first blade is fixedly connected with the first window sash, and the pin shaft is fixedly connected with the first blade in the circumferential direction; when the folding window is in the smoke exhaust state, the pin shaft starts to rotate under the driving of the first window sash until the first window sash drives the pin shaft to rotate to a first preset angle, the damping assembly generates a first damping force, and when the first window sash drives the pin shaft to continuously rotate from the first preset angle, the damping assembly generates a second damping force which is greater than the first damping force. The smoke exhaust window provided by the application can be quickly, conveniently and stably opened, and has a better smoke exhaust effect.

Description

Technical Field

[0001] This invention relates to the field of building door and window technology, specifically to a smoke exhaust window. Background Technology

[0002] In the field of building fire safety, smoke exhaust windows, as a core component of natural smoke exhaust systems, are widely used in various large buildings such as schools, offices, commercial complexes, and industrial plants. Their main function is to open quickly in the event of a fire to promptly exhaust the dense smoke and heat inside the building, creating safe conditions for personnel evacuation and fire rescue. At the same time, they can also meet the needs of ventilation and lighting in daily use, which is of great significance for ensuring building safety and indoor environmental comfort.

[0003] Currently, existing smoke exhaust window structures in buildings come in various forms, mainly including casement windows, awning windows, and sliding windows. However, these existing smoke exhaust window structures all suffer from poor ease of opening (ease of opening is one of the important evaluation indicators for the practicality of smoke exhaust windows), and require corresponding manual or electric opening actuators to open the smoke exhaust windows. This not only increases equipment costs but also affects the interior aesthetics when starting the equipment and actuators. In addition, limitations in opening angles or overlapping window sashes that occupy smoke exhaust space result in poor smoke exhaust efficiency. Therefore, there is an urgent need for a smoke exhaust window that is easy to open, allows for quick and smooth opening, and has a large smoke exhaust space and good smoke exhaust effect. Summary of the Invention

[0004] Therefore, in order to overcome the above problems, the present invention provides a smoke exhaust window that can be opened quickly, conveniently and smoothly, with a large opening angle, and the opened window sash will not occupy the smoke exhaust space, thus having a better smoke exhaust effect.

[0005] The smoke exhaust window provided by the present invention includes:

[0006] Fixed frame;

[0007] The first window sash and the second window sash are connected in a rotatable manner to the bottom of the fixed frame at the bottom. The bottom of the second window sash is connected in a rotatable manner to the top of the first window sash through several damping hinges. The top of the second window sash is connected in a rotatable and slidable manner to the fixed frame.

[0008] The locking mechanism is located on the first window sash and the fixed frame;

[0009] The smoke exhaust window has a locked state in which the first window sash and the second window sash are fixed in the fixed frame by the control locking device, and a smoke exhaust state in which the control locking device unlocks after receiving the smoke exhaust control signal, the top of the second window sash slides down toward the bottom of the fixed frame to form a smoke exhaust port, and the first window sash and the second window sash rotate and fold.

[0010] The damping hinge includes a pin and a first leaf, a second leaf, and a damping assembly that pass through the pin. The first leaf is fixedly connected to the first window sash, and the pin is circumferentially fixed to the first leaf. When the folding window is in smoke exhaust mode, the first window sash drives the pin to start rotating until it reaches a first preset angle, at which point the damping assembly generates a first damping force. When the first window sash drives the pin to continue rotating from the first preset angle, the damping assembly generates a second damping force greater than the first damping force.

[0011] Optionally, the damping component includes:

[0012] The first variable damping component is fixed on the pin; the first variable damping component is provided with damping protrusions;

[0013] The second variable damping element is fixed circumferentially relative to the second blade; the first end of the second variable damping element is provided with a first damping step and a second damping step corresponding to the damping protrusion.

[0014] The elastic element has two ends that abut against the second end of the second variable damping element and a limiting block, respectively. The limiting block is axially fixed relative to the pin. When the first window sash drives the pin to start rotating until the first preset angle, the damping protrusion abuts against the first damping step, and the elastic element generates a first deformation of compression deformation. When the first window sash drives the pin to continue rotating from the first preset angle, the damping protrusion abuts against the second damping step, and the elastic element generates a second deformation of compression deformation; the second deformation is greater than the first deformation.

[0015] Optionally, the second blade includes a second sleeve ring and a second fixing plate fixed on the second sleeve ring. The second sleeve ring is sleeved on the pin shaft, and the second fixing plate is connected to the second window sash. The first variable damping element, the second variable damping element, and the elastic element are all disposed inside the second sleeve ring, and the limiting block is disposed on the inner wall of the second sleeve ring.

[0016] Optionally, the first blade includes a first sleeve ring and a first fixing piece fixed on the first sleeve ring. The first sleeve ring is sleeved on the pin shaft, and the first fixing piece is connected to the second window sash. The first variable damping element is disposed adjacent to the first sleeve ring.

[0017] Optionally, there are at least two first and second coupling rings, with at least two first coupling rings and at least two second coupling rings alternately arranged on the pin shaft; the damping components corresponding to the second coupling rings are also at least two.

[0018] Optionally, the smoke exhaust window also includes:

[0019] A knob locking element is provided on the first window sash and the fixed frame. When the knob locking element is in the locked state, both the first and second window sashes are fixed in the fixed frame. When the knob locking element is in the unlocked state, the top of the second window sash can slide down toward the bottom of the fixed frame.

[0020] Optionally, the first window sash is rotatably connected to the fixed frame via a first transmission link. The first end of the first transmission link is rotatably connected to the bottom end of the side frame of the first window sash, and the second end is rotatably connected to the bottom end of the side frame in the fixed frame.

[0021] Optionally, the smoke exhaust window also includes:

[0022] The first support assembly includes a first support rod and a second support rod. The first end of the first support rod is rotatably connected to the middle of the side frame of the first window sash, and the second end is rotatably and slidably connected to the side frame in the fixed frame. The first end of the second support rod is rotatably connected to the first support rod, and the second end is rotatably connected to the fixed frame. The second end of the second support rod is located between the second end of the first support rod and the second end of the first transmission link.

[0023] Optionally, the second window sash is rotatably connected to the fixed frame via a second transmission link; the first end of the second transmission link is rotatably connected to the top of the side frame of the second window sash, and the second end is rotatably connected to a slider provided in the side frame of the fixed frame.

[0024] Optionally, the smoke exhaust window also includes:

[0025] The second support assembly includes a third support rod and a fourth support rod. The first end of the third support rod is rotatably connected to the middle of the side frame of the second window sash, and the second end is rotatably and slidably connected to the side frame in the fixed frame. The first end of the fourth support rod is rotatably connected to the third support rod, and the second end is rotatably connected to the slider. The second end of the fourth support rod is located between the second end of the third support rod and the second end of the second transmission link.

[0026] The technical solution of this invention has the following advantages:

[0027] The smoke exhaust window provided by this invention is a downward-folding smoke exhaust window comprising a first window sash and a second window sash, with the second window sash at the upper end sliding down towards the first window sash at the lower end. A control locking component for securing the first and second window sashes within a fixed frame automatically unlocks upon receiving a smoke exhaust control signal. This allows the second window sash to automatically slide down towards the first window sash under gravity, ultimately enabling the smoke exhaust window to open quickly and conveniently. Furthermore, the folded first and second window sashes do not occupy smoke exhaust space, ensuring the smoke exhaust effect of the window. By setting the damping hinge connecting the first and second window sashes to generate different damping forces during rotation, and by setting the second damping force generated when the opening angle of the first window sash is large (above the first preset angle) to be greater than the first damping force generated when the opening angle is small (0 degrees to the first preset angle), the first and second window sashes of the smoke exhaust window will not plummet during the entire opening process. Instead, they will first slide down and fold quickly to ensure timely smoke exhaust, and then slide down and fold slowly after opening to a certain angle to ensure opening safety and stability, thus further improving the practicality of the smoke exhaust window. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of a smoke exhaust window provided in an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram showing the installation location of a smoke exhaust window in the prior art;

[0031] Figure 3 This is a schematic diagram of the structure of the damping hinge provided in an embodiment of the present invention;

[0032] Figure 4 An exploded view of the structure of the damping hinge provided in an embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of a damping component provided in an embodiment of the present invention;

[0034] Figure 6 This is a schematic diagram of the positional relationship of a damping component when it generates a first damping force, provided by an embodiment of the present invention.

[0035] Figure 7 and Figure 8They are respectively Figure 1 Enlarged view of a portion of the smoke exhaust window structure;

[0036] Explanation of reference numerals in the attached figures:

[0037] 100-Fixed frame;

[0038] 200 - First window sash;

[0039] 300 - Second window sash;

[0040] 400-damped hinge;

[0041] 410 - Pin; 410a - First limiting plane;

[0042] 420 - First blade; 421 - First connecting ring; 421a - Second limiting plane; 422 - First fixing plate;

[0043] 430 - Second blade; 431 - Second connecting ring; 431a - Limiting block; 431b - Fifth limiting plane; 432 - Second fixing plate;

[0044] 440 - Damping assembly; 441 - First variable damping element; 441a - Damping protrusion; 442 - Second variable damping element; 442a - First damping step; 442b - Second damping step; 442c - Fourth limiting plane; 443 - Elastic element;

[0045] 500 - Control locking element;

[0046] 600 - Knob locking element;

[0047] 710 - First transmission link; 720 - First support assembly; 721 - First support rod; 722 - Second support rod;

[0048] 810 - Second transmission link; 820 - Slider; 830 - Second support assembly; 831 - Third support rod; 832 - Fourth support rod. Detailed Implementation

[0049] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0052] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0053] Furthermore, to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features not relevant to the currently considered best mode for carrying out the invention, or those features not relevant to implementing the invention) may be described. Moreover, the technical features involved in the different embodiments of the invention described below may be combined with each other as long as they do not conflict with each other.

[0054] Please refer to Figure 1 This is a schematic diagram of a smoke exhaust window provided in an embodiment of the present invention. The smoke exhaust window includes a fixed frame 100, a first window sash 200, a second window sash 300, a damping hinge 400, and a control locking component 500. The bottom of the first window sash 200 is rotatably connected to the bottom of the fixed frame 100. The bottom of the second window sash 300 is rotatably connected to the top of the first window sash 200 via several damping hinges 400. The top of the second window sash 300 is rotatably and slidably connected to the fixed frame 100. The control locking component 500 is disposed on the first window sash 200 and the fixed frame 100. The smoke exhaust window in this embodiment has a locked state where the control locking component 500 fixes both the first window sash 200 and the second window sash 300 within the fixed frame 100, and a smoke exhaust state where the control locking component 500 unlocks upon receiving a smoke exhaust control signal, the top of the second window sash 300 slides down toward the bottom of the fixed frame 100 to form a smoke exhaust opening, and the first window sash 200 and the second window sash 300 rotate and fold.

[0055] Those skilled in the art should understand that the control locking element 500 being disposed on the first window sash 200 and the fixed frame 100 means that the first locking element and the second locking element in the control locking element 500 are respectively disposed on the first window sash 200 and the fixed frame 100, and locking is achieved when the first locking element and the second locking element cooperate; for example, if the control locking element 500 is an electromagnetic lock, locking is achieved when the first locking element and the second locking element attract each other.

[0056] Similarly, the knob locking element 600 described below is provided on the first window sash 200 and the fixed frame 100, which also means that the two locking elements in the knob locking element 600 are respectively provided on the first window sash 200 and the fixed frame 100.

[0057] In this embodiment, in order to facilitate closing the smoke exhaust window in the smoke exhaust state, a pull handle can also be provided on the first window sash 200. In specific implementation, if the smoke exhaust window includes the knob locking member 600, the knob in the knob locking member 600 can be set as a handle-type knob, which can also serve as a pull handle. If the smoke exhaust window does not include the knob locking member 600, any form of pull handle can be provided, as long as it is convenient for the user to hold and pull.

[0058] Those skilled in the art should understand that, based on the linkage relationship between the second window sash 300 and the first window sash 200 in this embodiment, there is no need to install opening and closing devices on the second window sash 300. Furthermore, since the first window sash 200 is located below the second window sash 300, and its position is similar to that of existing technologies (such as...), Figure 2 As shown, the location of the ventilation window, i.e. the installation height of the first window sash 200, does not need to be greater than 1 / 2 of the indoor net height, and the height of the manual opening and closing operation position will not be higher than 1.4 meters. Therefore, the first window sash 200 can be equipped with the above-mentioned ordinary pull handle, without the need for the opening actuator used to open the smoke exhaust window in the prior art.

[0059] Those skilled in the art will understand that the upper end of the second window sash 300 in this embodiment is... Figure 2 The upper part of the smoke exhaust window in the prior art is similar, both located at the top of the building space. However, based on the top-to-bottom folding method of the second window sash 300 in this embodiment, the lower part of the second window sash 300 in this embodiment does not need to strictly comply with the requirement that it be greater than 1 / 2 of the indoor net height (because no matter where the installation height of the lower part of the second window sash 300 is located, it does not affect that the smoke exhaust outlet of the smoke exhaust window in this embodiment includes the part located at the top of the building space); the lower part of the second window sash 300, that is, the height dimension of the second smoke exhaust window 300, can be set according to the needs of specific application scenarios.

[0060] Please refer to Figure 3 and Figure 4 The damping hinge 400 includes a pin 410 and a first blade 420, a second blade 430, and a damping assembly 440 passing through the pin 410. The first blade 420 is fixedly connected to the first window sash 200, and the second blade 430 is fixedly connected to the second window sash 300. The pin 410 and the first blade 420 are circumferentially fixed. When the folding window is in the smoke exhaust state, the first window sash 200 drives the pin 410 to start rotating until the first preset angle. The damping assembly 440 generates a first damping force. When the first window sash 200 drives the pin 410 to continue rotating from the first preset angle, the damping assembly 440 generates a second damping force greater than the first damping force.

[0061] As an optional implementation method of this embodiment, such as Figure 5 and Figure 6As shown, the damping assembly 440 can be configured to include a first variable damping element 441, a second variable damping element 442, and an elastic element 443. The first variable damping element 441 is fixed to the pin 410 and has a damping protrusion 441a. The second variable damping element 442 is circumferentially fixed to the second blade 420, and its first end has a first damping step 442a and a second damping step 442b corresponding to the damping protrusion 441a. The two ends of the elastic element 443 are respectively connected to the first damping step 442a and the second blade 442a. The two ends abut against a limiting block 431a. The limiting block 431a is axially fixed relative to the pin 410. When the first window sash 200 drives the pin 410 to start rotating until the first preset angle, the damping protrusion 441a abuts against the first damping step 442a, and the elastic element 443 generates a first deformation of compression deformation. When the first window sash 200 drives the pin 410 to continue rotating from the first preset angle, the damping protrusion 441a abuts against the second damping step 442b, and the elastic element 443 generates a second deformation of compression deformation; the second deformation is greater than the first deformation.

[0062] In a specific implementation, the second blade 430 can include a second sleeve ring 431 and a second fixing piece 432 fixed on the second sleeve ring 431. The second sleeve ring 431 is sleeved on the pin 410, and the second fixing piece 432 is connected to the second window sash 300. The first variable damping element 441, the second variable damping element 442, and the elastic element 443 are all disposed within the second sleeve ring 431, and the limiting block 431a is disposed on the inner wall of the second sleeve ring 431. In a specific implementation, the first blade 420 can include a first sleeve ring 421 and a first fixing piece 422 fixed on the first sleeve ring 421. The first sleeve ring 421 is sleeved on the pin 410, and the first fixing piece 422 is connected to the second window sash 300. The first variable damping element 441 is disposed adjacent to the first sleeve ring 421.

[0063] In specific implementation, such as Figure 3 As shown, a first limiting plane 410a can be provided on the pin 410, and a second limiting plane 421a can be provided on the first sleeve ring 421. Thus, the pin 410 and the first blade 420 are circumferentially fixed through the cooperation of the first limiting plane 410a and the second limiting plane 421a. The first blade 420 and the second blade 430 are both fixed relative to the pin 410 in the axial direction.

[0064] In specific implementation, a third limiting plane corresponding to the first limiting plane 410a can be provided on the first variable damping component 441, thereby achieving circumferential fixation between the first variable damping component 441 and the pin 410 through the cooperation of the third limiting plane and the first limiting plane 410a (see attached). Figure 5The third limiting plane in the first variable damping element 441 is blocked by the damping protrusion 441a (not shown), and the axial movement of the first variable damping element 441 is blocked by the first sleeve 421 ring in the first blade 420. Finally, the first variable damping element 441 is fixed to the pin 410.

[0065] In specific implementation, such as Figure 4 and Figure 5 As shown, a fourth limiting plane 442c can be provided on the second variable damping member 442, and a fifth limiting plane 431b is provided inside the second sleeve ring 431 in the second blade 430. Thus, the second variable damping member 442 and the second blade 430 are circumferentially fixed through the cooperation of the fourth limiting plane 442c and the fifth limiting plane 431b (the second variable damping member 442 can slide axially relative to the pin 410).

[0066] In specific implementation, such as Figure 3 and Figure 4 As shown, at least two first socket rings 421 and at least two second socket rings 431 can be set, with at least two first socket rings 421 and at least two second socket rings 431 alternately arranged on the pin 410; the damping assembly 440 also corresponds to at least two second socket rings 431.

[0067] As an optional implementation of this embodiment, in order to further improve the practicality of the smoke exhaust window in this embodiment, such as... Figure 1 As shown, the smoke exhaust window may also include a knob locking component 600, which is disposed on the first window sash 200 and the fixed frame 100. When the knob locking component 600 is in the locked state, both the first window sash 200 and the second window sash 300 are fixed in the fixed frame 100. When the knob locking component 600 is in the unlocked state, the top of the second window sash 300 can slide down toward the bottom of the fixed frame 100.

[0068] As an optional implementation method of this embodiment, such as Figure 7 As shown, the first window sash 200 can be rotatably connected to the fixed frame 100 via the first transmission link 710. The first end of the first transmission link 710 is rotatably connected to the bottom end of the side frame of the first window sash 200, and the second end is rotatably connected to the bottom end of the side frame in the fixed frame 100.

[0069] As an optional implementation of this embodiment, in order to further improve the opening stability of the smoke exhaust window in this embodiment, such as... Figure 7As shown, the smoke exhaust window may also include a first support assembly 720, which includes a first support rod 721 and a second support rod 722. The first end of the first support rod 721 is rotatably connected to the middle of the side frame of the first window sash 200, and the second end is rotatably and slidably connected to the side frame in the fixed frame 100. The first end of the second support rod 722 is rotatably connected to the first support rod 721, and the second end is rotatably connected to the fixed frame 100. The second end of the second support rod 722 is located between the second end of the first support rod 721 and the second end of the first transmission link 710.

[0070] As an optional implementation method of this embodiment, such as Figure 8 As shown, the second window sash 300 can be rotatably connected to the fixed frame 100 via the second transmission link 810; the first end of the second transmission link 810 is rotatably connected to the top of the side frame of the second window sash 300, and the second end is rotatably connected to the slider 820 provided in the side frame of the fixed frame 100.

[0071] As an optional implementation of this embodiment, in order to further improve the opening stability of the smoke exhaust window in this embodiment, such as... Figure 8 The smoke exhaust window may be provided with a second support assembly 830, which includes a third support rod 831 and a fourth support rod 832. The first end of the third support rod 831 is rotatably connected to the middle of the side frame of the second window sash 300, and the second end is rotatably and slidably connected to the side frame in the fixed frame 100. The first end of the fourth support rod 832 is rotatably connected to the third support rod 831, and the second end is rotatably connected to the slider 820. The second end of the fourth support rod 832 is located between the second end of the third support rod 831 and the second end of the second transmission link 810.

[0072] In this embodiment, the smoke exhaust window is configured as a downward-folding smoke exhaust window, comprising a first window sash 200 and a second window sash 300, with the second window sash 300 at the upper end sliding down towards the first window sash 200 at the lower end. A control locking member 500, which locks the first and second window sashes 200 and 300 within the fixed frame 100, automatically unlocks upon receiving a smoke exhaust control signal. This allows the second window sash 300 to automatically slide down and fold towards the first window sash 200 under gravity. Ultimately, this allows the smoke exhaust window to open quickly and conveniently, and the folded first and second window sashes 200 and 300 do not occupy smoke exhaust space, ensuring effective smoke exhaust. The smoke extraction effect of the window is improved. Simultaneously, by setting the damping hinge 400 connecting the first window sash 200 and the second window sash 300, different damping forces are generated during rotation. Furthermore, the second damping force generated when the opening angle of the first window sash 200 is large (above the first preset angle) is greater than the first damping force generated when the opening angle is small (0 degrees to the first preset angle). This ensures that the first and second window sashes of the smoke extraction window do not plummet during opening; instead, they first quickly slide down and fold to ensure timely smoke extraction, and then slowly slide down and fold after reaching a certain opening angle to ensure opening safety and stability, further improving the practicality of the smoke extraction window.

[0073] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A smoke exhaust window, characterized in that, include: Fixed frame; The first window sash and the second window sash are connected in a rotatable manner to the bottom of the fixed frame. The bottom of the second window sash is connected in a rotatable manner to the top of the first window sash via several damping hinges. The top of the second window sash is connected in a rotatable and slidable manner to the fixed frame. A locking mechanism is provided on the first window sash and the fixed frame; The smoke exhaust window has a locked state in which the control locking member fixes both the first window sash and the second window sash within the fixed frame, and a smoke exhaust state in which the control locking member unlocks after receiving a smoke exhaust control signal, the top of the second window sash slides down toward the bottom of the fixed frame to form a smoke exhaust port, and the first window sash and the second window sash rotate and fold. The damping hinge includes a pin and a first blade, a second blade, and a damping assembly passing through the pin. The first blade is fixedly connected to the first window sash, the second blade is fixedly connected to the second window sash, and the pin is circumferentially fixed to the first blade. In the smoke exhaust state, when the first window sash drives the pin to start rotating until a first preset angle, the damping components generate a first damping force. When the first window sash drives the pin to continue rotating from the first preset angle, the damping components generate a second damping force greater than the first damping force.

2. The smoke exhaust window according to claim 1, characterized in that, The damping component includes: The first variable damping element is fixed on the pin; the first variable damping element is provided with damping protrusions; The second variable damping element is fixed circumferentially relative to the second blade; the first end of the second variable damping element is provided with a first damping step and a second damping step corresponding to the damping protrusion; An elastic element has two ends that abut against the second end of the second variable damping element and a limiting block, respectively. The limiting block is axially fixed relative to the pin. When the first window sash drives the pin to start rotating until a first preset angle, the damping protrusion abuts against the first damping step, and the elastic element generates a first deformation of compression deformation. When the first window sash drives the pin to continue rotating from the first preset angle, the damping protrusion abuts against the second damping step, and the elastic element generates a second deformation of compression deformation; the second deformation is greater than the first deformation.

3. The smoke exhaust window according to claim 2, characterized in that, The second blade includes a second sleeve ring and a second fixing piece fixed on the second sleeve ring. The second sleeve ring is sleeved on the pin shaft, and the second fixing piece is connected to the second window sash. The first variable damping element, the second variable damping element and the elastic element are all disposed inside the second sleeve ring, and the limiting block is disposed on the inner wall of the second sleeve ring.

4. The smoke exhaust window according to claim 3, characterized in that, The first blade includes a first sleeve ring and a first fixing piece fixed on the first sleeve ring. The first sleeve ring is sleeved on the pin shaft, and the first fixing piece is connected to the second window sash. The first variable damping element is disposed adjacent to the first sleeve ring.

5. The smoke exhaust window according to claim 4, characterized in that, There are at least two of both the first and second sockets, and at least two of the first and second sockets are alternately arranged on the pin; the damping assembly corresponding to the second socket is also at least two.

6. The smoke exhaust window according to any one of claims 1-5, characterized in that, Also includes: A knob locking element is provided on the first window sash and the fixed frame; when the knob locking element is in the locked state, both the first window sash and the second window sash are fixed in the fixed frame; when the knob locking element is in the unlocked state, the top of the second window sash can slide down toward the bottom of the fixed frame.

7. The smoke exhaust window according to claim 6, characterized in that, The first window sash is rotatably connected to the fixed frame via a first transmission link. The first end of the first transmission link is rotatably connected to the bottom end of the side frame of the first window sash, and the second end is rotatably connected to the bottom end of the side frame in the fixed frame.

8. The smoke exhaust window according to claim 7, characterized in that, Also includes: The first support assembly includes a first support rod and a second support rod. The first end of the first support rod is rotatably connected to the middle of the side frame of the first window sash, and the second end is rotatably and slidably connected to the side frame of the fixed frame. The first end of the second support rod is rotatably connected to the first support rod, and the second end is rotatably connected to the fixed frame. The second end of the second support rod is located between the second end of the first support rod and the second end of the first transmission link.

9. The smoke exhaust window according to claim 6, characterized in that, The second window sash is rotatably connected to the fixed frame via a second transmission link; the first end of the second transmission link is rotatably connected to the top of the side frame of the second window sash, and the second end is rotatably connected to a slider provided inside the side frame of the fixed frame.

10. The smoke exhaust window according to claim 9, characterized in that, Also includes: The second support assembly includes a third support rod and a fourth support rod. The first end of the third support rod is rotatably connected to the middle of the side frame of the second window sash, and the second end is rotatably and slidably connected to the side frame of the fixed frame. The first end of the fourth support rod is rotatably connected to the third support rod, and the second end is rotatably connected to the slider. The second end of the fourth support rod is located between the second end of the third support rod and the second end of the second transmission link.

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