Protective closed gate valve for through-wall air duct and its sealing method

Abstract

The present invention relates to the field of engineering protection technology, and discloses a protective closed gate valve for a through-wall air duct and a sealing method thereof. The present invention includes a box body, a closed cover plate assembly arranged in the box body, and a driving assembly for driving the closed cover plate assembly to open or close; the box body includes a connecting pipe body and an equipment box that are interconnected, and the openings at both ends of the connecting pipe body are respectively connected and sealed with the through-wall pipe fittings and the air duct pre-buried in the wall, and the equipment box is located on one side of the connecting pipe body, and the closed cover plate assembly includes a closed gate plate that matches the pipe opening of the through-wall pipe fitting and a sliding member located on the surface of the closed gate plate, and the sliding member is slidingly arranged in a high-position slideway or a low-position slideway on both sides, and the closed gate plate is connected to the driving assembly through a connecting rod; the driving assembly includes a transmission assembly for outputting power and a guide assembly for adjusting the direction of power. The present invention does not require installation or disassembly, is convenient to use, saves time and effort, and has good sealing performance.

Description

Technical Field

[0001] The invention relates to the technical field of engineering protection, and in particular to a protective closed gate valve for a through-wall air duct and a sealing method thereof. Background Art

[0002] According to the relevant provisions of my country's Civil Air Defense Law, the construction of subway projects must take into account the needs of civil air defense in wartime. The civil air defense system in urban subways is an extremely important component of urban civil air defense. The construction of underground railways must take into account the needs of civil air defense, combine peacetime and wartime, and make comprehensive use of them.

[0003] When air ducts and other pipelines pass through the closed partition wall or air-facing wall between protection units, plate-type protective closed blocking plates or protective closed doors are usually used for temporary blocking. These two solutions have the following disadvantages:

[0004] (1) Plate-type protective sealed plugging plates are used for emergency plugging. The plugging plates need to be stored separately during normal times, and the air ducts and other facilities need to be dismantled for emergency conversion, which is time-consuming and labor-intensive.

[0005] (2) Protective sealed doors are used for pre-war sealing. The door panels are usually installed at high places, which makes them less safe. Conversion during wartime requires climbing up high and removing facilities such as air ducts, which is time-consuming, labor-intensive, and difficult to operate.

[0006] In order to achieve rapid conversion between peacetime and wartime and improve product operability, it is of practical significance to develop a protective closed gate valve for air ducts passing through protective closed partition walls. This can save space for peacetime functions and there is no need to dismantle air ducts and other facilities in wartime. Summary of the invention

[0007] The invention provides a protective closed gate valve for a wall-penetrating air duct which does not require installation or disassembly, is convenient to use, saves time and effort, and has good sealing performance, and a sealing method thereof.

[0008] The technical problem to be solved is: the installation and disassembly process of the traditional blocking structure is complicated, time-consuming and labor-intensive, and has poor safety, poor construction convenience and high difficulty.

[0009] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0010] The protective closed gate valve for the through-wall air duct of the present invention comprises a box body, a closed cover assembly arranged in the box body, and a driving assembly for driving the closed cover assembly to open or close;

[0011] The box body includes a connecting pipe body and an equipment box which are interconnected. The openings at both ends of the connecting pipe body are respectively connected and sealed with the through-wall pipe fittings and the air duct pre-buried in the wall. The equipment box is located on one side of the connecting pipe body and is a rectangular box structure with one end open. The open end is matched with and connected to the side wall of the connecting pipe body. The equipment box is enclosed by relatively arranged cover plates, a blocking plate located between adjacent cover plates, and an end plate. The blocking plate is aligned with the opposite side walls of the connecting pipe body and connected to form an integral wall plate. A guide slide, a high-position slide, and a low-position slide are sequentially provided on the inner surface of the integral wall plate in the direction of the through-wall pipe fitting.

[0012] The closed cover assembly includes a closed gate matched with the pipe opening of the wall-penetrating pipe fitting and a sliding member located on the surface of the closed gate. The sliding member is slidably arranged in the high-position slideway or the low-position slideway on both sides. The closed gate is connected to the driving assembly through a connecting rod.

[0013] The driving assembly includes a transmission assembly for outputting power and a guide assembly for adjusting the direction of power. The transmission assembly includes a transmission screw, an operating wheel arranged at the end of the transmission screw, and a base screwed on the transmission screw. The transmission screw is located between the guide slideway and the high-position slideway and is arranged along the length direction of the guide slideway. One end of the transmission screw is rotatably connected to the box wall plate, and the other end is vertically passed through the end plate of the equipment box and fixedly connected to the operating wheel located outside the equipment box. One end of the connecting rod is rotatably connected to the base, and the other end is rotatably connected to the closed gate plate.

[0014] The guide assembly comprises a guide plate and a sliding support member located around the guide plate. One end of the guide plate is connected to the base, and the sliding support member is slidably arranged in the guide slideway.

[0015] The protective closed gate valve of the wall-penetrating air duct of the present invention further has annular ribs respectively arranged at the openings at both ends of the connecting pipe body, the annular ribs are arranged horizontally along the circumference of the connecting pipe body, and a sealing strip is arranged on the annular rib close to the side of the wall-penetrating pipe fitting.

[0016] The protective closed gate valve of the through-wall air duct of the present invention, further, the annular rib is hollow inside, and is enclosed with the side wall of the connecting pipe body to form a closed cavity with a square longitudinal cross-section, which is surrounded by stainless steel plates, and the wall panel close to the pipe opening of the connecting pipe body extends horizontally outward to form a connecting flange, which is connected and fixed to the through-wall pipe fittings or air ducts on both sides by bolts.

[0017] The protective closed gate valve of the wall-penetrating air duct of the present invention, further, the sealing strip is located on the wall plate on the side of the annular rib away from the wall-penetrating pipe fitting, and is arranged along the circumference of the connecting pipe body. An installation groove is opened on the surface of the annular rib corresponding to the sealing strip, and the sealing strip is arranged in the installation groove.

[0018] The protective closed gate valve of the wall-penetrating air duct of the present invention further comprises a sealing strip which is a nitrile rubber strip with a P-shaped cross-section, a horizontal surface of the sealing strip contacts and fits with the bottom surface of the installation groove, and is fixed to the annular rib by screws.

[0019] The protective closed gate valve of the wall-penetrating air duct of the present invention further has a fireproof layer on the inner surface of the cover plate, and the fireproof layer is an asbestos rubber plate fixed to the cover plate by screws.

[0020] The protective closed gate valve of the through-wall air duct of the present invention, further, the guide slide is arranged along the radial length of the connecting pipe body, and continuously extends to the side wall of the connecting pipe body, the high-position slide and the low-position slide both include a straight section and an inclined section that are connected to each other, the straight section is arranged along the radial length of the connecting pipe body, and continuously extends to the side wall of the connecting pipe body, the inclined section is located on the side wall of the connecting pipe body at the tail of the straight section, and the straight section is connected with the inclined section by a smooth transition.

[0021] The protective closed gate valve of the wall-penetrating air duct of the present invention, further, the sliding part is located on the side of the closed gate facing the center of the equipment box, including a central lifting ear arranged at the center of the closed gate, a pair of high-position sliding parts and a pair of low-position sliding parts symmetrically arranged on both sides of the closed gate, the central lifting ear is rotatably connected to one end of the connecting rod, the high-position sliding part is located at the front end of the closed gate in the closing direction of travel, and is slidably arranged in the high-position slideways on both sides, and the low-position sliding part is located at the rear end of the closed gate in the closing direction of travel, and is slidably arranged in the low-position slideways on both sides.

[0022] The protective closed gate valve for the through-wall air duct of the present invention further has an asbestos rubber plate arranged between the joint surface of the connecting flange and the through-wall pipe fitting or the air duct.

[0023] The sealing method of the protective sealed gate valve of the through-wall air duct of the present invention comprises the following steps:

[0024] Step 1: Turn the operating wheel to drive the transmission screw to rotate around its axis, and the guide plate fixedly connected to the base slides along the guide slide toward the connecting pipe body, and the base slides along the transmission screw toward the connecting pipe body;

[0025] Step 2: The base drives the closed gate to slide toward the connecting pipe body in the box slideway through the connecting rod, and the sliding member slides toward the connecting pipe body in the straight section of the slideway;

[0026] Step 3: The sliding part enters the oblique section, and the closed gate plate approaches the pipe opening of the connecting pipe body along the oblique section. When sliding to the end of the oblique section, the plate surface of the closed gate plate contacts and presses with the sealing strip to achieve the sealing of the connecting pipe body.

[0027] Compared with the prior art, the protective closed gate valve for the through-wall air duct and the sealing method thereof of the present invention have the following beneficial effects:

[0028] The present invention can meet the needs of wartime blocking when air ducts and other pipelines pass through closed partition walls or air-facing walls between protection units, thereby realizing rapid peacetime-wartime conversion. It has a simple structure, convenient operation, and no need for high-altitude operations. It avoids the problems of large workload in wartime conversion, large demand for conversion materials, and long conversion time, and has strong practicality.

[0029] The present invention arranges a P-shaped sealing strip at the sealing part, which has good fit with the sealing gate plate and high sealing performance. The sealing strip has good sealing, wear resistance and high temperature resistance and long service life. The connection parts are provided with asbestos rubber plates, which not only have sealing performance but also have good fire prevention effect, taking into account both civil defense and fire fighting.

[0030] The movement trajectory of the closed gate of the present invention moves along the high-position slide and the low-position slide. The slide is divided into a straight section and an inclined section, which not only leaves sufficient storage and moving space for the closed cover assembly, but also can achieve the closed sealing of the closed cover assembly without conversion. When the closed gate moves to the inclined section of the slide, the closed gate gradually presses the sealing strip to achieve the sealing function of the air duct mouth.

[0031] The present invention adopts a stable box-type structure, which not only provides an installation platform for other moving parts, but also the connecting flange at the mouth can be tightly combined with the flange of the wall-penetrating pipe fitting and the air duct, which is easy to set up. When it does not need to be sealed and closed, it will not affect the normal use and ventilation of the air duct. When temporary blocking is required, there is no need to dismantle the air duct and install the blocking mechanism. The blocking can be completed by rotating the operating wheel, which greatly reduces the construction workload of blocking and improves the blocking efficiency. It has a wide range of application needs in subway civil air defense projects. Under the premise of having both protective and sealing functions, it improves the economic benefits, thereby promoting combat readiness benefits and social benefits, and turning the construction of civil air defense projects into profitable engineering projects and a carrier serving economic construction.

[0032] The protective closed gate valve for the wall-penetrating air duct and the sealing method thereof of the present invention will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the protective closed gate valve of the wall-penetrating air duct of the present invention;

[0034] Figure 2 It is a structural schematic diagram of the gate of the present invention in an open state;

[0035] Figure 3 for Figure 2 The detailed structural diagram of the sealing strip at the center A;

[0036] Figure 4 It is a schematic diagram of the longitudinal section of the box;

[0037] Figure 5 for Figure 4XX section schematic diagram in;

[0038] Figure 6 It is a structural schematic diagram of a closed cover assembly;

[0039] Figure 7 for Figure 6 A side view of the closed cover assembly;

[0040] Figure 8 is a structural schematic diagram of the transmission assembly;

[0041] Fig. 9 The schematic diagram of the structure of the guide assembly;

[0042] Fig.10 It is a structural schematic diagram of the closed state of the device.

[0043] Reference numerals:

[0044] 11- wall-penetrating pipe fittings; 12- air duct; 2- connecting pipe body; 21- annular rib; 22- connecting flange; 3- equipment box; 31- cover plate; 32- blocking plate; 33- end plate; 4- sealing strip; 41- mounting groove; 42- screw; 43- gasket; 51- guide slide; 52- high slide; 53- low slide; 61- closed gate; 62- center lifting ear; 63- high slide; 64- low slide; 71- operating wheel; 72- transmission screw; 73- base; 8- connecting rod; 91- guide plate; 92- sliding support. DETAILED DESCRIPTION

[0045] like Figure 1 and Figure 2 As shown, the protective closed gate valve for the through-wall air duct of the present invention includes a box body, a closed cover assembly arranged in the box body, and a driving assembly for driving the closed cover assembly to open or close; the openings at both ends of the box body are respectively connected and sealed with the through-wall pipe fitting 11 and the air duct 12 pre-buried in the wall through connecting flanges 22.

[0046] The through-wall pipe fitting 11 directly passes through the closed partition wall or the air-facing wall between the protection units and is cast together with the wall. The through-wall pipe fitting 11 is provided with a closed wing ring at the center of the wall thickness to play a protective and sealing role.

[0047] like Figure 4As shown, the box body includes a connecting pipe body 2 and an equipment box 3 that are interconnected. The cross-sectional shape of the connecting pipe body 2 is consistent with the air duct 12, and is square in the present embodiment. Annular ribs 21 are respectively arranged at the openings at both ends of the connecting pipe body 2. The annular ribs 21 are horizontally arranged along the circumference of the connecting pipe body 2, and are hollow inside. They are enclosed with the side walls of the connecting pipe body 2 to form a closed cavity with a square longitudinal section, which can not only enhance the strength of the connecting pipe body, avoid squeezing and deformation of the pipe body, and ensure that it can be tightly connected with the through-wall pipe fitting 11 or the air duct 12, but also reduce the dead weight of the box structure, facilitate installation, and provide a support platform for the closed seal of the closed cover assembly; the annular ribs 21 are enclosed by stainless steel plates, and the wall panel on the side close to the pipe opening of the connecting pipe body 2 extends horizontally outward to form a connecting flange 22, which is connected and fixed to the through-wall pipe fitting 11 or the air duct 12 on both sides by bolts.

[0048] An asbestos rubber sheet is provided between the joint surface between the connecting flange 22 and the wall-penetrating pipe fitting 11 or the air duct 12, which can effectively play a sealing and fire-proofing role.

[0049] like Figure 3 As shown, a sealing strip 4 is arranged on the annular rib 21 close to the wall-penetrating pipe fitting 11. The sealing strip 4 is a nitrile rubber strip with a P-shaped cross-section, which is located on the wall panel of the annular rib 21 away from the wall-penetrating pipe fitting 11, and is arranged along the circumference of the connecting pipe body 2. A mounting groove 41 is provided on the surface of the annular rib 21 corresponding to the sealing strip 4. The sealing strip 4 is arranged in the mounting groove 41, and the horizontal surface of the sealing strip 4 is in contact with the bottom surface of the mounting groove 41 and is fixed to the annular rib 21 by screws 42. A gasket 43 is also arranged between the screws 42 and the sealing strip 4 to prevent the screws 42 from damaging the sealing strip 4; after the raised cylindrical strip contacts with the closed cover assembly, it can be effectively sealed, which greatly improves the sealing performance of the closed cover assembly. At the same time, nitrile rubber also has good wear resistance and high temperature resistance, long service life and good sealing effect; the P-shaped integrated strip, the horizontal surface of which is connected to the annular rib 21 with screws 42, has good connection firmness, and does not damage the structure of the cylindrical strip that plays a sealing role, and has good sealing performance.

[0050] like Figure 4 and Figure 5As shown, the equipment box 3 is located on one side of the connecting pipe body 2, and is a rectangular box structure with one end open. The open end is matched with and connected to the side wall of the connecting pipe body 2. The equipment box 3 is surrounded by relatively arranged cover plates 31, sealing plates 32 located between adjacent cover plates 31, and end plates 33. The cover plate 31 is aligned with the wall plate on the side of the annular rib 21 close to the center of the pipe body and welded and fixed. The sealing plate 32 is aligned with the corresponding pipe walls of the connecting pipe body 2 on both sides and welded and fixed; the inner surface of the cover plate 31 is provided with a fireproof layer, which is an asbestos rubber plate, fixed to the cover plate 31 by screws 42, and has the functions of sealing and fireproofing; the inner surface of the sealing plate 32 is arranged in a direction toward the through-wall pipe fitting 11 according to A guide slide 51, a high-position slide 52 and a low-position slide 53 are provided. The guide slide 51 is arranged along the radial length of the connecting pipe body 2 and extends continuously to the side wall of the connecting pipe body 2. The high-position slide 52 and the low-position slide 53 both include a straight section and an inclined section that are interconnected. The straight section is arranged along the radial length of the connecting pipe body 2 and extends continuously to the side wall of the connecting pipe body 2. The inclined section is located on the side wall of the connecting pipe body 2 at the tail of the straight section. The straight section is smoothly connected with the inclined section. The angle between the inclined section and the straight section is consistent, which is 160-170°, which not only leaves enough storage and moving space for the closed cover plate assembly, but also can realize the closed sealing of the closed cover plate assembly without conversion.

[0051] like Figure 6 and 7 As shown, the closed cover assembly includes a closed gate 61 matched with the pipe opening of the wall-penetrating pipe 11 and a sliding member located on the surface of the closed gate 61, the sliding member is located on the side of the closed gate 61 facing the center of the equipment box 3, including a central ear 62 arranged at the center of the closed gate 61, a pair of high-position sliding members 63 and a pair of low-position sliding members 64 symmetrically arranged on both sides of the closed gate 61, the central ear 62 is connected to the driving assembly through the connecting rod 8, and the central ear 62 is rotatably connected to one end of the connecting rod 8; the high-position sliding member 63 is located at the closed gate The front end of the plate 61 in the closing direction is slidably arranged in the high-position slideways 52 on both sides. The low-position sliding member 64 is located at the rear end of the closed gate plate 61 in the closing direction, and is slidably arranged in the low-position slideways 53 on both sides. When the driving assembly drives the closed gate plate 61 to move through the connecting rod 8, the sliding members around it can slide in the slideway to reduce the friction of the movement of the closed gate plate 61, making the opening or closing process smoother and more fluent; the sliding member can be a moving wheel or a bearing, and it can cooperate with the movement in the slideway to reduce the friction.

[0052] The drive assembly includes a transmission assembly for outputting power and a guide assembly for controlling the direction of power, such as Figure 8As shown, the transmission assembly includes a transmission screw 72, an operating wheel 71 arranged at the end of the transmission screw 72, and a base 73 screwed on the transmission screw 72. The transmission screw 72 is located in the equipment box 3, between the guide slide 51 and the high-position slide 52, and is arranged along the length direction of the guide slide 51. One end of the transmission screw 72 is fixed to the box wall panel through a bearing assembly, and the other end vertically passes through the end plate 33 of the equipment box 3 and is fixedly connected to the operating wheel 71 located on the outside of the equipment box 3, and is rotatably connected to the end plate 33 through the bearing assembly; the side wall of the base 73 is rotatably connected to one end of the connecting rod 8, and the adjacent side is connected and fixed to the guide assembly by bolts; by rotating the operating wheel 71, the transmission screw 72 can be driven to rotate around the axis, and then the rotary motion of the transmission screw 72 is converted into a linear reciprocating motion of the base 73, and the base 73 drives the connecting rod 8 to move, thereby driving the closed gate 61 to open or close.

[0053] The operating wheel 71 is a hand wheel or a sprocket, which can be rotated by hand. When the protective closed gate valve 61 is installed at a high place, the transmission screw 72 can also be driven to rotate through the sprocket on the ground, thereby closing or opening the closed gate 61, avoiding high-altitude operations and improving operating efficiency and convenience.

[0054] like Fig. 9 As shown, the guide assembly includes a guide plate 91 and sliding supports 92 located around the guide plate 91. The guide plate 91 is a stainless steel plate adapted to the width of the equipment box 3. The edge of one side close to the operating wheel 71 protrudes horizontally outward to form a mounting portion, which is detachably connected to the base 73 by bolts. The sliding support 92 is a circulating roller guide bearing, which is slidably arranged in the guide slide 51. When the base 73 generates a movement trend, it plays a supporting and guiding role.

[0055] The sealing method of the protective sealed gate valve of the through-wall air duct of the present invention comprises the following steps:

[0056] Step 1: Rotate the operating wheel 71 to drive the transmission screw 72 to rotate around its axis, and the base 73 generates a movement trend. The guide plate 91 fixedly connected to the base 73 slides along the guide slide 51 toward the connecting tube body 2, and at the same time, the base 73 slides along the transmission screw 72 toward the connecting tube body 2;

[0057] Step 2: The base 73 drives the closed gate plate 61 to slide toward the connecting pipe body 2 in the box slideway through the connecting rod 8, and the high-position sliding member 63 and the low-position sliding member 64 both slide toward the connecting pipe body 2 in the straight section of the slideway;

[0058] Initially, the closed gate plate 61 is located in the equipment box 3, and a certain space is left between the closed gate plate 61 and the cover plate 31 of the equipment box 3 for easy storage and movement. As it slides along the straight section, it gradually moves to the top of the blocked pipe opening in the inner connecting pipe body 2.

[0059] Step 3: The high-position sliding member 63 and the low-position sliding member 64 begin to enter the oblique section at the same time, and the closed gate plate 61 moves toward the pipe opening of the connecting pipe body 2 along the oblique section. When sliding to the end of the oblique section, the plate surface of the closed gate plate 61 contacts and presses the sealing strip 4 to achieve the sealing of the connecting pipe body 2. Fig.10 Status shown.

[0060] The embodiments described above are merely descriptions of preferred implementation modes of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. The protective closed gate valve of the through-wall air duct is characterized by: It includes a box body, a sealed cover assembly arranged in the box body, and a driving assembly for driving the sealed cover assembly to open or close; The box body comprises a connecting pipe body (2) and an equipment box (3) which are interconnected. The openings at both ends of the connecting pipe body (2) are respectively connected and sealed to the through-wall pipe fittings (11) and the air duct (12) pre-buried in the wall. Annular ribs (21) are respectively arranged at the openings at both ends of the connecting pipe body (2). The annular ribs (21) are arranged horizontally along the circumference of the connecting pipe body (2). A sealing strip (4) is arranged on the annular rib (21) on the side close to the through-wall pipe fitting (11). The equipment box (3) is located on one side of the connecting pipe body (2) and is a rectangular box structure with one end open. The open end is matched with and connected to the side wall of the connecting pipe body (2); the equipment box (3) is enclosed by relatively arranged cover plates (31), sealing plates (32) located between adjacent cover plates (31), and end plates (33); the sealing plates (32) are aligned with the relatively two side walls of the connecting pipe body (2) and are connected to form an integral wall plate; the inner surface of the integral wall plate is provided with a guide slide (51), a high slide (52), and a low slide (53) in sequence in the direction of the through-wall pipe fitting (11); the inner surface of the cover plate (31) is provided with a fireproof layer; The sealed cover plate assembly comprises a sealed gate plate (61) matched with the pipe opening of the wall-penetrating pipe (11) and a sliding member located on the surface of the sealed gate plate (61), the sliding member being slidably arranged in the high-position slideway (52) or the low-position slideway (53) on both sides, and the sealed gate plate (61) is connected to the driving assembly via a connecting rod (8); The drive assembly comprises a transmission assembly for outputting power and a guide assembly for adjusting the direction of power, the transmission assembly comprising a transmission screw (72), an operating wheel (71) arranged at the end of the transmission screw (72), and a base (73) screwed on the transmission screw (72), the transmission screw (72) being located between the guide slideway (51) and the high-position slideway (52), being arranged along the length direction of the guide slideway (51), one end of which is rotatably connected to the box body wall plate, and the other end of which vertically passes through the end plate (33) of the equipment box (3) and is fixedly connected to the operating wheel (71) located outside the equipment box (3), one end of the connecting rod (8) being rotatably connected to the base (73), and the other end of which is rotatably connected to the closed gate plate (61); The guide assembly comprises a guide plate (91) and a sliding support member (92) located around the guide plate (91); one end of the guide plate (91) is connected to the base (73); and the sliding support member (92) is slidably disposed in the guide slideway (51).

2. The protective closed gate valve for the through-wall air duct according to claim 1 is characterized in that: The annular rib (21) is hollow inside and encloses the side wall of the connecting pipe body (2) to form a closed cavity with a square longitudinal cross-section, which is enclosed by a stainless steel plate. The wall plate on the side close to the pipe opening of the connecting pipe body (2) extends horizontally outward to form a connecting flange (22), which is connected and fixed to the wall-penetrating pipe fittings (11) or air ducts (12) on both sides by bolts.

3. The protective closed gate valve for the through-wall air duct according to claim 2 is characterized in that: The sealing strip (4) is located on the wall plate on the side of the annular rib (21) away from the wall-penetrating pipe fitting (11), and is arranged along the circumference of the connecting pipe body (2). A mounting groove (41) is provided on the surface of the annular rib (21) corresponding to the sealing strip (4), and the sealing strip (4) is arranged in the mounting groove (41).

4. The protective closed gate valve for the through-wall air duct according to claim 3 is characterized in that: The sealing strip (4) is a nitrile rubber strip with a P-shaped cross section. The horizontal surface of the sealing strip (4) is in contact with the bottom surface of the installation groove (41) and is fixed to the annular rib (21) by means of screws (42).

5. The protective closed gate valve for the through-wall air duct according to claim 1 is characterized in that: The fireproof layer is an asbestos rubber sheet, which is fixed to the cover plate (31) by screws (42).

6. The protective closed gate valve for the through-wall air duct according to claim 1, characterized in that: The guide slideway (51) is arranged along the radial length of the connecting tube body (2) and extends continuously to the side wall of the connecting tube body (2). The high-position slideway (52) and the low-position slideway (53) both comprise a straight section and an inclined section that are connected to each other. The straight section is arranged along the radial length of the connecting tube body (2) and extends continuously to the side wall of the connecting tube body (2). The inclined section is located on the side wall of the connecting tube body (2) at the tail of the straight section. The straight section and the inclined section are connected in a smooth transition.

7. The protective closed gate valve for the through-wall air duct according to claim 1, characterized in that: The sliding member is located on one side of the closed gate plate (61) facing the center of the equipment box (3), and includes a central lifting lug (62) arranged at the center of the closed gate plate (61), a pair of high-position sliding members (63) and a pair of low-position sliding members (64) symmetrically arranged on both sides of the closed gate plate (61), the central lifting lug (62) being rotatably connected to one end of the connecting rod (8), the high-position sliding member (63) being located at the front end of the closed gate plate (61) in the closing direction of movement, and being slidably arranged in the high-position slideways (52) on both sides, and the low-position sliding member (64) being located at the rear end of the closed gate plate (61) in the closing direction of movement, and being slidably arranged in the low-position slideways (53) on both sides.

8. The protective closed gate valve for the through-wall air duct according to claim 1, characterized in that: An asbestos rubber sheet is provided between the joint surface between the connecting flange (22) and the wall-penetrating pipe (11) or the air duct (12).

9. The sealing method for the protective and sealed gate valve of the through-wall air duct according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: rotating the operating wheel (71) to drive the transmission screw (72) to rotate around its axis, so that the guide plate (91) fixedly connected to the base (73) slides along the guide slideway (51) toward the connecting tube body (2), and the base (73) slides along the transmission screw (72) toward the connecting tube body (2); Step 2: The base (73) drives the closed gate (61) to slide in the box slideway toward the connecting pipe body (2) through the connecting rod (8), and the sliding member slides in the straight section of the slideway toward the connecting pipe body (2); Step 3: The sliding member enters the oblique section, and the sealing gate plate (61) moves along the oblique section toward the pipe opening of the connecting pipe body (2). When sliding to the end of the oblique section, the plate surface of the sealing gate plate (61) contacts and presses the sealing strip (4), thereby sealing the connecting pipe body (2).

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