Air door for air duct intersection

Abstract

The air door is suitable for the air duct intersection point and comprises a door body and a driving device, the door body is hinged to a contact area, and the driving device is used for driving the door body to rotate so that the door body can be switched between a first ventilation mode for blocking a first air duct and a second ventilation mode for blocking a second air duct; in the first ventilation mode, the first air channel communicates with the third air channel, and in the second ventilation mode, the second air channel communicates with the third air channel. According to the air door, alternating work of the first air duct and the second air duct can be completed through the rotating action of one door body, air flow reversing is achieved, the air flow reversing speed is high, the air flow reversing efficiency is high, and therefore normal operation of a mine ventilation system is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of dampers, and in particular to a damper used at an intersection of air ducts. Background Art

[0002] To ensure continuous ventilation, mine ventilation systems typically feature an air duct intersection. This intersection is formed by the intersection of a primary and secondary duct. Fans are installed in both the primary and secondary ducts. If the primary duct fails, the secondary duct is activated, ensuring continuous ventilation. In related art, each of the primary and secondary ducts is equipped with two dampers: a flap damper and a rotary vane damper. The flap damper is closer to the air duct intersection than the rotary vane damper. Each duct is controlled by both dampers to open and close.

[0003] In the above-mentioned related technologies, the plug-in damper usually adopts a slide rail structure, which has a long stroke, slow speed and occupies a large space, resulting in slow speed and low efficiency of air duct reversing, affecting the normal operation of the mine ventilation system. Summary of the Invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention proposes a damper for use at the intersection of air ducts, which can complete the rotation of the first air duct and the second air duct through the rotation of a door body, realize wind flow reversal, and make the wind flow reversal faster and more efficient, thereby ensuring the normal operation of the mine ventilation system.

[0006] A damper for use at an air duct intersection according to an embodiment of the present invention includes a door body and a drive device. The door body is hinged at the contact area, and the drive device is used to drive the door body to rotate, so that the door body switches between a first ventilation mode that blocks the first air duct and a second ventilation mode that blocks the second air duct. In the first ventilation mode, the first air duct communicates with the third air duct, and in the second ventilation mode, the second air duct communicates with the third air duct.

[0007] In some embodiments, the damper further comprises a door frame, the door frame comprising a first mullion, a second mullion, and a third mullion, the first mullion being connected to the contact area, the door body being hinged to the first mullion, the second mullion being connected to the second side wall, and the third mullion being connected to the fourth side wall;

[0008] In the first ventilation mode, the side of the door body away from the first mullion is in contact with the second mullion. In the second ventilation mode, the side of the door body away from the first mullion is in contact with the third mullion.

[0009] In some embodiments, the second mullion has a first vertical surface and a second vertical surface arranged to intersect each other, the first vertical surface is parallel to the second side wall, and the third mullion has a third vertical surface and a fourth vertical surface arranged to intersect each other, the third vertical surface is parallel to the fourth side wall;

[0010] The door body includes a sealing member arranged away from the first vertical frame, the sealing member having a first sealing surface, a second sealing surface, a third sealing surface and a fourth sealing surface, the first sealing surface is arranged to intersect with the second sealing surface, and the third sealing surface is arranged to intersect with the fourth sealing surface;

[0011] In the first ventilation mode, the first sealing surface is in contact with the first vertical surface, and the second sealing surface is in contact with the second vertical surface. In the second ventilation mode, the third sealing surface is in contact with the third vertical surface, and the fourth sealing surface is in contact with the fourth vertical surface.

[0012] In some embodiments, there is an installation gap between the door body and the first vertical frame, and the damper also includes an accordion sealing plate, the accordion sealing plate has a first end side and a second end side that are relatively telescopic, the first end side and the second end side of the accordion sealing plate are respectively connected to the door body and the first vertical frame, and the accordion sealing plate blocks the installation gap.

[0013] In some embodiments, the driving device includes a telescopic member and a connecting rod, the telescopic member having a first end and a second end that can be relatively telescopic, the first end of the telescopic member is hinged to the door frame, the second end of the telescopic member is hinged to one end of the connecting rod, and the other end of the connecting rod is hinged to the door body.

[0014] In some embodiments, there are multiple driving devices, at least one driving device is arranged on the upper side of the door body, and at least one driving device is arranged on the lower side of the door body.

[0015] In some embodiments, the damper further includes a position sensor, and the position sensor is disposed on the second side wall and / or the fourth side wall, so as to detect the position of the door body through the position sensor.

[0016] In some embodiments, the damper further includes a control system, and the position sensor and the telescopic member are both connected to the control system signal.

[0017] In some embodiments, the damper further includes a heating device, which is disposed inside the door body.

[0018] In some embodiments, the heating device includes an electric heating tube, which is arranged inside the door body along the circumference of the door body.

[0019] The damper of the embodiment of the present invention is suitable for the intersection of air ducts. By using a driving device to drive the door body to rotate, the switching between the first ventilation mode and the second ventilation mode can be realized. In other words, the rotation of the first air duct and the second air duct can be completed through the rotation of a door body, and the wind flow reversal can be realized, so that the wind flow reversal speed is faster and the efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the position of the damper at the intersection of the air duct according to one embodiment of the present invention.

[0021] Figure 2 It is a structural schematic diagram of a damper according to an embodiment of the present invention.

[0022] Figure 3 It is a structural schematic diagram of the damper from another angle according to an embodiment of the present invention.

[0023] Figure 4 yes Figure 3 Enlarged schematic diagram of point A in the middle.

[0024] Figure 5 yes Figure 3 Enlarged schematic diagram of point B in the middle.

[0025] Reference numerals:

[0026] 100, air door;

[0027] 1. Door body; 11. Door body; 111. Mounting cavity; 12. Sealing member; 121. First rubber sheet; 122. Second rubber sheet; 123. First sealing surface; 124. Second sealing surface; 125. Third sealing surface; 126. Fourth sealing surface; 13. Hinge;

[0028] 2. Driving device; 21. Telescopic member; 211. First end; 212. Second end; 22. Connecting rod; 23. First rotating shaft; 24. Second rotating shaft;

[0029] 3. Door frame; 31. First mullion; 32. Second mullion; 321. First vertical surface; 322. Second vertical surface; 33. Third mullion;

[0030] 4. Organ sealing plate;

[0031] 5. Position sensor;

[0032] 6. Electric heating tube;

[0033] 201, first air duct; 2011, first side wall; 2012, second side wall; 202, second air duct; 2021, third side wall; 2022, fourth side wall; 203, third air duct. DETAILED DESCRIPTION

[0034] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0035] like Figure 1 As shown, the intersection of the air ducts includes a first air duct 201, a second air duct 202 and a third air duct 203, wherein the first air duct 201 has a first side wall 2011 and a second side wall 2012 arranged opposite to each other, and the second air duct 202 has a third side wall 2021 and a fourth side wall 2022 arranged opposite to each other, and the first side wall 2011 and the third side wall 2021 are connected to form a contact area.

[0036] The damper 100 of an embodiment of the present invention includes a door body 1 and a driving device 2, the door body 1 is hinged at the contact area, and the driving device 2 is used to drive the door body 1 to rotate so that the door body 1 switches between a first ventilation mode that blocks the first air duct 201 and a second ventilation mode that blocks the second air duct 202; in the first ventilation mode, the first air duct 201 is connected to the third air duct 203, and in the second ventilation mode, the second air duct 202 is connected to the third air duct 203.

[0037] The damper 100 of the embodiment of the present invention is suitable for the intersection of air ducts. The driving device 2 is used to drive the door body 1 to rotate, so as to realize the switching between the first ventilation mode and the second ventilation mode. In other words, the rotation of the door body 1 can complete the rotation of the first air duct 201 and the second air duct 202, thereby realizing the wind flow reversal, making the wind flow reversal faster and more efficient, thereby ensuring the normal operation of the mine ventilation system.

[0038] In addition, the damper 100 of the embodiment of the present invention has a door body 1 that is hingedly installed at the intersection of the air ducts. The first air duct 201 and the second air duct 202 can be controlled by only one door body 1. It occupies less space and is more convenient to install, which can save the construction cost and operation cost of the mine ventilation system.

[0039] As an example, Figure 1 As shown, the first air duct 201, the second air duct 202 and the third air duct 203 are arranged to intersect, the first air duct 201 has a first air section arranged close to the third air duct 203, the second air duct 202 has a second air section arranged close to the third air duct 203, and the angle formed by the center line of the first air section and the center line of the second air section is α, α is 60° to 90°, preferably 60°; the first air section has the above-mentioned first side wall 2011 and the second side wall 2012, the second air section has the above-mentioned third side wall 2021 and the fourth side wall 2022, and the first side wall 2011 and the second side wall 2012 intersect to form the above-mentioned contact area.

[0040] One side of the door body 1 is hinged at the contact area. In the first ventilation mode, the width direction of the door body 1 is perpendicular to the center line of the first air duct 201, and the door body 1 blocks the first air duct 201. At this time, the airflow can flow between the second air duct 202 and the third air duct 203; in the second ventilation mode, the width direction of the door body 1 is perpendicular to the center line of the second air duct 202, and the door body 1 blocks the second air duct 202. At this time, the airflow can flow between the first air duct 201 and the third air duct 203.

[0041] In some embodiments, as Figure 1 and Figure 2 As shown, the damper 100 further includes a door frame 3, which includes a first mullion 31, a second mullion 32 and a third mullion 33. The first mullion 31 is connected to the contact area, the door body 1 is hinged to the first mullion 31, the second mullion 32 is connected to the second side wall 2012, and the third mullion 33 is connected to the fourth side wall 2022; in the first ventilation mode, the side of the door body 1 away from the first mullion 31 is in contact with the second mullion 32, and in the second ventilation mode, the side of the door body 1 away from the first mullion 31 is in contact with the third mullion 33.

[0042] Since the side walls of the mine air duct are relatively poorly flat, by setting a door frame 3 and cooperating with the door body 1, it is more conducive to improving the sealing of the door body 1 when blocking the first air duct 201 or the second air duct 202, reducing the air leakage in the air duct, and improving the overall operating efficiency of the fan.

[0043] As an example, Figure 1 As shown, the door frame 3 also includes a first transverse frame and a second transverse frame. There are two first transverse frames, which are respectively provided on the top wall and bottom wall of the first air duct 201. The ends of the first transverse frame are respectively connected to the first mullion 31 and the second mullion 32. In the first ventilation mode, the upper side of the door body 1 is in contact with the first transverse frame. There are two second transverse frames, which are respectively provided on the top wall and bottom wall of the second air duct 202. The ends of the second transverse frame are respectively connected to the first mullion 31 and the third mullion 33. In the second ventilation mode, the upper side of the door body 1 is in contact with the second transverse frame.

[0044] In some embodiments, as Figure 3 and Figure 4As shown, the second vertical frame 32 has a first vertical surface 321 and a second vertical surface 322 arranged to intersect, and the first vertical surface 321 is parallel to the second side wall 2012. The third vertical frame 33 has a third vertical surface and a fourth vertical surface arranged to intersect, and the third vertical surface is parallel to the fourth side wall 2022. The door body 1 includes a seal 12 arranged away from the first vertical frame 31, and the seal 12 has a first sealing surface 123, a second sealing surface 124, a third sealing surface 125 and a fourth sealing surface 126. The first sealing surface 123 is arranged to intersect with the second sealing surface 124, and the third sealing surface 125 is arranged to intersect with the fourth sealing surface 126. In the first ventilation mode, the first sealing surface 123 is in contact with the first vertical surface 321, and the second sealing surface 124 is in contact with the second vertical surface 322. In the second ventilation mode, the third sealing surface 125 is in contact with the third vertical surface, and the fourth sealing surface 126 is in contact with the fourth vertical surface.

[0045] In the first ventilation mode, the door body 1 blocks the first air duct 201, and the first sealing surface 123 is fitted with the first vertical surface 321, and the second sealing surface 124 is fitted with the second vertical surface 322, so that the door body 1 and the second vertical frame 32 can be sealed from two directions; similarly, in the second ventilation mode, the door body 1 blocks the second air duct 202, and the third sealing surface 125 is fitted with the third vertical surface, and the fourth sealing surface 126 is fitted with the fourth vertical surface, so that the door body 1 and the third vertical frame 33 can be sealed from two directions, thereby greatly reducing the air leakage in the air duct, improving the overall operating efficiency of the fan, and saving the operating cost of the main ventilation fan station in the mine.

[0046] As an example, Figure 3 and Figure 4 As shown, the second mullion 32 is fixedly mounted on the second sidewall 2012 of the first air duct 201, with the first vertical surface 321 and the second vertical surface 322 being perpendicular to each other, the first vertical surface 321 being parallel to the second sidewall 2012, and the second vertical surface 322 being located on the side of the second mullion 32 closer to the first air duct 201. Similarly, the third mullion 33 is fixedly mounted on the fourth sidewall 2022 of the second air duct 202, with the third vertical surface and the fourth vertical surface being perpendicular to each other, the third vertical surface being parallel to the fourth sidewall 2022, and the fourth vertical surface being located on the side of the third mullion 33 closer to the first air duct 201.

[0047] The door body 1 includes a door body 11 and a sealing member 12. The door body 11 is hinged to the first mullion 31. The sealing member 12 includes a first rubber plate 121 and a second rubber plate 122. The first rubber plate 121 and the second rubber plate 122 are both long strips and extend vertically along the height direction of the door body 1. The first rubber plate 121 and the second rubber plate 122 are arranged in parallel, and the plate surfaces of the first rubber plate 121 and the second rubber plate 122 are parallel to the door surface of the door body 1.

[0048] There are multiple first rubber sheets 121, with three being used as an example in this embodiment. The door body 11 has a mounting cavity 111, and the three first rubber sheets 121 are evenly distributed along the thickness direction of the door body 1 and fixed within the mounting cavity 111 of the door body 1. There are also multiple second rubber sheets 122, with two being used as an example in this embodiment. The two second rubber sheets 122 are disposed on the outside of the door body 11 and fixedly connected to the side of the door body 11 away from the first mullion 31. The mutually distal surfaces of the two second rubber sheets 122 respectively form the aforementioned second sealing surface 124 and fourth sealing surface 126. The second sealing surface 124 is arranged toward the first air duct 201, and the fourth sealing surface 126 is arranged toward the second air duct 202.

[0049] The two second rubber plates 122 divide the side of the door body 11 away from the first vertical frame 31 into a first portion and a second portion. The first portion is arranged close to the first sealing surface 123, and the second portion is arranged close to the second sealing surface 124. The side of the first rubber plate 121 arranged in the first portion away from the first vertical frame 31 is the above-mentioned first sealing surface 123, and the side of the first rubber plate 121 arranged in the second portion away from the first vertical frame 31 is the above-mentioned third sealing surface 125. The first sealing surface 123 and the second sealing surface 124 are perpendicular to each other, and the third sealing surface 125 and the fourth sealing surface 126 are perpendicular to each other.

[0050] Thus, the door body 1 rotates between the first air duct 201 and the second air duct 202. When the door body 1 blocks the first air duct 201, the first sealing surface 123 and the first vertical surface 321 are squeezed and tightly fitted with each other, and the second sealing surface 124 and the second vertical surface 322 are squeezed and tightly fitted with each other, which can improve the sealing of the connection between the door body 1 and the second vertical frame 32; the third sealing surface 125 and the third vertical surface are squeezed and tightly fitted with each other, and the fourth sealing surface 126 and the fourth vertical surface are squeezed and tightly fitted with each other, which can improve the sealing of the connection between the door body 1 and the third vertical frame 33, thereby reducing the air leakage in the first ventilation mode and the second ventilation mode, and improving the overall operating efficiency of the fan.

[0051] Optionally, a reinforcement device is provided between two adjacent first rubber plates 121 or two adjacent second rubber plates 122 to ensure the stability of the first rubber plates 121 and the second rubber plates 122 .

[0052] In some embodiments, as Figure 3 and Figure 5 As shown, there is an installation gap between the door body 1 and the first vertical frame 31, and the damper 100 also includes an accordion sealing plate 4, which has a relatively telescopic first end 211 side and a second end 212 side. The first end 211 side and the second end 212 side of the accordion sealing plate 4 are respectively connected to the door body 1 and the first vertical frame 31, and the accordion sealing plate 4 blocks the installation gap.

[0053] Specifically, the door body 1 is hinged to the first vertical frame 31 through a hinge 13, and the hinge 13 is installed in the above-mentioned installation gap. The first end 211 side of the accordion sealing plate 4 is fixedly connected to the side of the door body 1 close to the first vertical frame 31, and the second end 212 side of the accordion sealing plate 4 is fixedly connected to the first vertical frame 31 or the hinge 13. The above-mentioned installation gap can be blocked by the accordion sealing plate 4, thereby improving the sealing of the connection between the door body 1 and the first vertical frame 31, further reducing the air leakage, and improving the overall operating efficiency of the fan.

[0054] Optionally, the accordion sealing plate 4 is made of rubber.

[0055] In some embodiments, as Figure 1 and Figure 2 As shown, the driving device 2 includes a telescopic member 21 and a connecting rod 22. The telescopic member 21 has a first end 211 and a second end 212 that can be relatively telescopic. The first end 211 of the telescopic member 21 is hinged to the door frame 3, the second end 212 of the telescopic member 21 is hinged to one end of the connecting rod 22, and the other end of the connecting rod 22 is hinged to the door body 1.

[0056] The telescopic member 21 and the connecting rod 22 form a connecting rod 22 mechanism. The telescopic member 21 can be used to control the rotation of the door body 1, thereby realizing automatic switching between the first ventilation mode and the second ventilation mode. The operation is more convenient and the airflow reversal speed is faster.

[0057] Optionally, the telescopic member 21 is an oil cylinder including a cylinder body and a piston rod. The end of the cylinder body away from the piston rod is the first end 211 of the telescopic member 21 , and the end of the piston rod away from the cylinder body is the second end 212 of the telescopic member 21 .

[0058] The first end 211 is hinged to the door frame 3 through the first rotating shaft 23, the second end 212 is hinged to one end of the connecting rod 22, and the other end of the connecting rod 22 is hinged to the door body 1 through the second rotating shaft 24. The door body 1 can be controlled to rotate automatically by the extension and contraction of the cylinder.

[0059] In some embodiments, as Figure 2 As shown, there are multiple driving devices 2 , at least one driving device 2 is arranged on the upper side of the door body 1 , and at least one driving device 2 is arranged on the lower side of the door body 1 .

[0060] In some embodiments, the damper 100 further includes a position sensor 5 , which is disposed on the second side wall 2012 and / or the fourth side wall 2022 , so as to detect the position of the door body 1 through the position sensor 5 .

[0061] In some embodiments, the damper 100 further includes a control system, and the position sensor 5 and the telescopic member 21 are both connected to the control system signal.

[0062] Specifically, if Figure 1 and Figure 3 As shown, there are two position sensors 5, and the two position sensors 5 are respectively arranged on the second vertical frame 32 and the third vertical frame 33. The position sensor 5 can detect the position of the door body 1, and then determine whether the door body 1 is rotated to the preset position; for example, in the first ventilation mode, the first sealing surface 123 of the door body 1 is in contact with the first vertical surface 321, and the second sealing surface 124 is in contact with the second vertical surface 322, indicating that the door body 1 is rotated to the preset position, and the door body 1 can completely block the first air duct 201; in the second ventilation mode, the third sealing surface 125 of the door body 1 is in contact with the third vertical surface, and the fourth sealing surface 126 is in contact with the fourth vertical surface, indicating that the door body 1 is rotated to the preset position, and the door body 1 can completely block the second air duct 202; when the position sensor 5 detects that the door body 1 is rotated to the preset position, the position sensor 5 sends a signal to the control system, and the control system controls the telescopic part 21 (cylinder) to stop moving, thereby realizing the airflow reversing action.

[0063] In some embodiments, as Figure 2 and Figure 3 As shown, the damper 100 further includes a heating device, which is arranged inside the door body 1.

[0064] In some embodiments, the heating device includes an electric heating tube 6 , which is arranged inside the door body 1 along the circumference of the door body 1 .

[0065] It is known that condensed water is prone to freezing in the air duct in winter, affecting the rotation of the door body 1 .

[0066] By providing a heating device, the door body 1 can be heated to prevent the door body 1 and the structure connected thereto from freezing, thereby ensuring the normal operation of the door body 1 and enabling the mine ventilation system to operate normally.

[0067] Specifically, if Figure 2 As shown, the electric heating tube 6 extends along the circumference of the door body 1 in a rectangular shape, which can heat the door body 1 in all directions and achieve a good anti-freezing effect.

[0068] Of course, in other embodiments, the electric heating tube 6 may also be arranged in a serpentine or spiral shape to increase the length of the electric heating tube 6 , thereby improving the antifreeze effect of the door body 1 .

[0069] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0070] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0071] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0072] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0073] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0074] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A damper for an air duct intersection, characterized in that: The air duct intersection includes a first air duct, a second air duct, and a third air duct, wherein the first air duct has a first side wall and a second side wall arranged opposite to each other, and the second air duct has a third side wall and a fourth side wall arranged opposite to each other, and the first side wall and the third side wall are connected to form a contact area; The damper includes a door body and a driving device, wherein the door body is hinged to the contact area, and the driving device is used to drive the door body to rotate so that the door body switches between a first ventilation mode for blocking the first air duct and a second ventilation mode for blocking the second air duct; In the first ventilation mode, the first air duct is communicated with the third air duct, and in the second ventilation mode, the second air duct is communicated with the third air duct.

2. The damper for the intersection of air ducts according to claim 1, characterized in that: The damper further comprises a door frame, the door frame comprising a first mullion, a second mullion and a third mullion, the first mullion being connected to the contact area, the door body being hinged to the first mullion, the second mullion being connected to the second side wall, and the third mullion being connected to the fourth side wall; In the first ventilation mode, the side of the door body away from the first mullion is in contact with the second mullion. In the second ventilation mode, the side of the door body away from the first mullion is in contact with the third mullion.

3. The damper for the intersection of air ducts according to claim 2, characterized in that: The second mullion has a first vertical surface and a second vertical surface intersecting each other, the first vertical surface is parallel to the second side wall, and the third mullion has a third vertical surface and a fourth vertical surface intersecting each other, the third vertical surface is parallel to the fourth side wall; The door body includes a sealing member arranged away from the first vertical frame, the sealing member having a first sealing surface, a second sealing surface, a third sealing surface and a fourth sealing surface, the first sealing surface is arranged to intersect with the second sealing surface, and the third sealing surface is arranged to intersect with the fourth sealing surface; In the first ventilation mode, the first sealing surface is in contact with the first vertical surface, and the second sealing surface is in contact with the second vertical surface. In the second ventilation mode, the third sealing surface is in contact with the third vertical surface, and the fourth sealing surface is in contact with the fourth vertical surface.

4. The damper for the intersection of air ducts according to claim 2, characterized in that: There is an installation gap between the door body and the first vertical frame. The damper also includes an accordion sealing plate. The accordion sealing plate has a first end side and a second end side that are relatively telescopic. The first end side and the second end side of the accordion sealing plate are respectively connected to the door body and the first vertical frame. The accordion sealing plate blocks the installation gap.

5. The damper for the intersection of air ducts according to claim 2, characterized in that: The driving device includes a telescopic member and a connecting rod, the telescopic member has a first end and a second end that can be relatively telescopic, the first end of the telescopic member is hinged to the door frame, the second end of the telescopic member is hinged to one end of the connecting rod, and the other end of the connecting rod is hinged to the door body.

6. The damper for the intersection of air ducts according to claim 5, characterized in that: There are multiple driving devices, at least one driving device is arranged on the upper side of the door body, and at least one driving device is arranged on the lower side of the door body.

7. The damper for an air duct intersection according to claim 5, characterized in that: The damper further includes a position sensor, which is disposed on the second side wall and / or the fourth side wall, so as to detect the position of the door body through the position sensor.

8. The damper for the intersection of air ducts according to claim 7, characterized in that: The damper further includes a control system, and the position sensor and the telescopic member are both connected to the control system by signal.

9. The damper for an air duct intersection according to any one of claims 1 to 8, characterized in that: The damper further comprises a heating device, which is arranged inside the door body.

10. The damper for an air duct intersection according to claim 9, characterized in that: The heating device includes an electric heating tube, which is arranged inside the door body along the circumference of the door body.

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