Ventilation device for closed space

Abstract

The invention relates to the technical field of closed space ventilation, in particular to a closed space ventilation device which comprises a fan installation air pipe, a ventilation fan is rotatably installed in the fan installation air pipe, and a ventilation installation air pipe is fixedly installed on the fan installation air pipe. And a limiting mounting ring is fixedly mounted in the center of the lower side of the ventilation mounting air pipe, a telescopic flexible air pipe is mounted in the limiting mounting ring, and a ventilation mounting opening is fixedly formed in the lower end of the telescopic flexible air pipe. According to the device, the turbine fan blades are arranged, so that the ventilation efficiency is greatly improved, the pressure of the first rotating motor during operation can be reduced, a ventilation fan of the device is not provided with a back plate, the situation that air is blocked in the circulation process is avoided, the ventilation efficiency is improved when the device is used, and the service life of the device is prolonged. In addition, the ventilation fan and the turbine fan blades are installed in a suspension mode, two sets of installation points are arranged, and therefore operation is more stable.

Description

Technical Field

[0001] The invention relates to the technical field of enclosed space ventilation, in particular to a enclosed space ventilation device. Background Art

[0002] Ventilation pipes are hollow pipes used for ventilation, mostly in round or square shapes. The plates, profiles and other main finished materials used in the production and installation of ventilation pipes should comply with the design and relevant national standards for products, and should be inspected and accepted according to the current national standards when materials are delivered. Ventilation of general confined spaces is mostly carried out through ventilation ducts, especially large spaces such as factories that need ventilation.

[0003] However, in actual use, since the ventilation duct is suspended on the roof, the distance between the ventilation hole and the space below is relatively far, which reduces the ventilation efficiency of the ventilation duct and makes it difficult to ventilate the lower space in the first time, which makes the people working in the lower space feel bad. In addition, after long-term use, dust will accumulate in the ventilating holes or filter layers of the existing ventilation device, which will affect the efficiency and quality of ventilation. The replacement or cleaning of the existing filter layer will cause the ventilation duct to be too high and difficult to carry out, which increases the difficulty of equipment maintenance. For this reason, we propose a closed space ventilation device to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a closed space ventilation device to solve the problems in the above background technology that the ventilation efficiency of the lower space is low and the dust at the ventilation opening is difficult to clean and the filter layer is difficult to replace.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a confined space ventilation device, comprising a fan mounting duct, a ventilation fan is rotatably installed in the fan mounting duct, a ventilation mounting duct is fixedly installed on the fan mounting duct, a limiting mounting ring is fixedly installed at the center position of the lower side of the ventilation mounting duct, a telescopic flexible duct is installed in the limiting mounting ring, a ventilation mounting port is fixedly installed at the lower end of the telescopic flexible duct, a first ventilation slot is provided on the ventilation mounting port, two groups of second ventilation slots are provided on the lower side of the ventilation mounting duct, a driving mechanism is provided on the fan mounting duct, an extension mechanism is provided on the lower side of the ventilation mounting duct, a filtering mechanism is provided at the second ventilation slot, and mounting mechanisms are provided on the fan mounting duct and the ventilation mounting duct.

[0006] Preferably, the driving mechanism includes a first mounting block, two groups of first mounting blocks are fixedly installed in the fan mounting air duct, a mounting bearing is installed at the lower end of the first mounting block, the rotating shaft between the ventilation fans is fixedly installed in the mounting bearing, a first gear is fixedly installed at the center position of the rotating shaft between the ventilation fans, a transmission gear ring is provided in the fan mounting air duct, the first gear and the transmission gear ring are meshed with each other, an annular groove is provided on the upper side of the center position in the fan mounting air duct, the transmission gear ring is rotatably installed in the annular groove, a second gear is provided at the center position on the upper side of the fan mounting air duct, a first rotating motor is fixedly installed on the upper side of the fan mounting air duct, a second gear is fixedly installed on the output shaft of the first rotating motor, and the second gear and the transmission gear ring are meshed with each other.

[0007] Preferably, a shielding box is fixedly installed on the fan mounting air duct, the shielding box shields the first rotating motor and the second gear, a first roller is rotatably installed in an array at the annular groove, the transmission gear ring is against the first roller, and turbine blades are fixedly installed on the rotating shaft between the ventilation fans.

[0008] Preferably, the extending mechanism includes a sliding slot, two groups of sliding slots are provided at the lower side of the ventilation installation duct, a sliding block is slidably installed in the sliding slot, a second roller is rotatably installed in the lower side array of the sliding block, the second roller abuts against the sliding slot, the lower end of the sliding block is fixedly installed with a second fixed block, a connecting block is fixedly installed on the second fixed block, a limiting plate is fixedly installed on the lower side of the ventilation installation opening, the limiting plate abuts against the limiting installation ring, a rack is fixedly installed on the connecting block, and the two groups of racks are arranged opposite to each other, a motor mounting slot is provided at the lower side of the ventilation installation duct, a second rotating motor is fixedly installed in the motor mounting slot, a third gear is fixedly installed on the output shaft of the second rotating motor, the third gear and the two groups of racks are meshed with each other, a second filter block is hinged on the second roller, and a third fixed block is fixedly installed on the left and right sides of the limiting plate, and the second filter block is hinged on the upper side of the third fixed block.

[0009] Preferably, the filtering mechanism includes a first filter block, the first filter block is fixedly installed in the ventilation mounting port, the upper end of the telescopic flexible air duct is fixedly installed in the limiting mounting ring, the rest of the telescopic flexible air duct is not fixedly connected to the limiting mounting ring, a shielding block is provided on the lower side of the second ventilation groove, ventilation holes are provided in an array on the upper side of the shielding block, and a second filter block is provided in the shielding block.

[0010] Preferably, installation grooves are provided on the left and right sides of the shielding block, a rotating rod is rotatably installed in the installation groove, a torsion spring is provided on the rotating shaft of the rotating rod, a stop block is fixedly installed at one end of the rotating rod, and the stop block abuts against the lower side of the second filter block.

[0011] Preferably, the shielding block is fixedly mounted on the second filter block, the shielding block is larger than the second ventilation slot and fits the second ventilation slot, and the size of the second ventilation slot matches the size of the second fixing block.

[0012] Preferably, the opposite side of the third fixing block is adapted to the shape of the outer side of the limiting mounting ring, and the third fixing block is hollowed out as a whole and has elasticity.

[0013] Preferably, the first gear and the second gear are of the same size, there is an obvious distance between the ventilation fan and the turbine blades, and the first mounting block is fixedly mounted on the upper side of the inner wall of the fan mounting duct.

[0014] Preferably, the mounting mechanism includes a mounting frame, which is fixedly mounted on the end of the fan mounting duct, with mounting holes provided at four corners of the mounting frame, and four groups of second mounting blocks are fixedly mounted on the upper side of the ventilation mounting duct, with a mounting rod movably inserted in the second mounting block, and a mounting hole provided at the upper end of the mounting rod.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention is provided with turbine blades, which greatly increases the ventilation efficiency, thereby reducing the pressure during the operation of the first rotating motor, and the ventilation fan of the equipment is installed without a back plate, so the air will not be blocked during the circulation process, which increases the ventilation efficiency of the equipment when it is in use, and the ventilation fan and the turbine blades are installed in a suspended manner, and there are two groups of installation points, so it is more stable during operation, and the equipment is also provided with a ventilation installation port that can be raised and lowered, so that after the ventilation installation port is lowered, efficient ventilation can be carried out in the space of the lower layer, and the physical sense of the staff in the lower space is better, and in situations where some timely ventilation is required, such as when there is too much dust, rapid ventilation can be achieved by lowering the ventilation installation port, which increases the functionality of the equipment when in use, and the lowered ventilation installation port allows the second filter block to be brought down, so that the second filter block can be easily replaced, which increases the convenience of the equipment when in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic front view of the structure of the present invention;

[0018] Figure 2 It is a bottom view schematic diagram of the structure of the present invention;

[0019] Figure 3 This is a schematic diagram of the structural cross-section of the fan of the present invention where the air duct is installed;

[0020] Figure 4 This is a schematic diagram of the structural separation of the fan of the present invention where the air duct is installed;

[0021] Figure 5 It is a schematic diagram of the structure of the present invention;

[0022] Figure 6 It is a structural schematic diagram of the telescopic flexible air duct of the present invention;

[0023] Figure 7 It is a schematic cross-sectional view of the structure of the shielding block of the present invention;

[0024] Figure 8 This is a schematic diagram showing the structure of the ventilation duct installation of the present invention;

[0025] Fig. 9 For the present invention Figure 4 A is a partial enlarged schematic diagram;

[0026] Fig.10 For the present invention Figure 7 A is a partial enlarged schematic diagram of the middle part.

[0027] In the figure: 1. fan installation duct; 2. ventilation fan; 3. ventilation installation duct; 4. limit installation ring; 5. telescopic soft duct; 6. ventilation installation port; 7. first ventilation slot; 8. second ventilation slot; 9. first installation block; 10. installation bearing; 11. first gear; 12. transmission gear ring; 13. annular groove; 14. second gear; 15. first rotating motor; 16. shielding box; 17. first roller; 18. turbine blade; 19. sliding slot; 20. sliding block; 21. Second roller; 22. Second fixed block; 23. Connecting block; 24. Limiting plate; 25. Rack; 26. Motor mounting slot; 27. Second rotating motor; 28. Third gear; 29. ​​First filter block; 30. Shielding block; 31. Ventilation hole; 32. Second filter block; 33. Third fixed block; 34. Mounting rotating slot; 35. Rotating rod; 36. Torsion spring; 37. Stop block; 38. Mounting frame; 39. Mounting hole; 40. Second mounting block; 41. Mounting rod. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1-10 , an embodiment of the present invention provides: a confined space ventilation device, comprising a fan installation duct 1, a ventilation fan 2 is rotatably installed in the fan installation duct 1, a ventilation installation duct 3 is fixedly installed on the fan installation duct 1, a limited mounting ring 4 is fixedly installed at the center position of the lower side of the ventilation installation duct 3, a telescopic soft air duct 5 is installed in the limited mounting ring 4, a ventilation installation port 6 is fixedly installed at the lower end of the telescopic soft air duct 5, a first ventilation slot 7 is opened on the ventilation installation port 6, two groups of second ventilation slots 8 are opened on the lower side of the ventilation installation duct 3, a driving mechanism is arranged on the fan installation duct 1, an extension mechanism is arranged on the lower side of the ventilation installation duct 3, a filtering mechanism is arranged at the second ventilation slot 8, and a mounting mechanism is arranged on the fan installation duct 1 and the ventilation installation duct 3. The overall structure of the device is attached to the existing ventilation The ventilation duct structure used is supported by mature technical adjustments during the installation process, making it more convenient and stable during the installation process. The ventilation system of the equipment has been improved by removing the back plate wind shield and adding turbine blades 18 to enhance the circulation speed, making the ventilation efficiency of the equipment higher. In addition, a ventilation mounting port 6 that can be raised and lowered is provided. When the ventilation mounting port 6 is folded, it is located at the lower side of the ventilation mounting duct 3 and is closed by the limiting mounting ring 4 so that no ventilation can be carried out. After being unfolded, it extends downward so that the ventilation mounting port 6 can be opened and is in the space on the lower side, and the second ventilation slot 8 originally used for ventilation will be covered. In this way, only the ventilation mounting port 6 can be used for ventilation during the descent of the ventilation mounting port 6, thereby increasing the ventilation efficiency of the lower space.

[0030] Furthermore, the driving mechanism includes a first mounting block 9, two groups of first mounting blocks 9 are fixedly installed in the fan mounting air duct 1, a mounting bearing 10 is installed at the lower end of the first mounting block 9, the rotating shaft between the ventilation fans 2 is fixedly installed in the mounting bearing 10, a first gear 11 is fixedly installed at the center position of the rotating shaft between the ventilation fans 2, a transmission gear ring 12 is provided in the fan mounting air duct 1, the first gear 11 and the transmission gear ring 12 are meshed with each other, an annular groove 13 is provided on the upper side of the center position in the fan mounting air duct 1, the transmission gear ring 12 is rotatably installed in the annular groove 13, a second gear 14 is provided at the center position on the upper side of the fan mounting air duct 1, a first rotating motor 15 is fixedly installed on the upper side of the fan mounting air duct 1, a second gear 14 is fixedly installed on the output shaft of the first rotating motor 15, the second gear 14 and the transmission gear ring 12 are meshed with each other, the When the structure is in use, the output shaft of the first rotating motor 15 drives the second gear 14 to rotate, and the second gear 14 drives the transmission gear ring 12 to rotate through meshing. At this time, the transmission gear ring 12 rotates in the annular groove 13. The rotation of the transmission gear ring 12 drives the first gear 11 to rotate, thereby driving the ventilation fan 2 and the turbine blades 18 to rotate. At this time, the ventilation fan 2 rotates relative to the first mounting block 9. The structure installs the ventilation fan 2 by hoisting. Compared with the backplate installation, this installation method will improve the ventilation efficiency, and the transmission gear ring 12 as a driving connecting part will not block the circulation of wind. Moreover, there are two installation points for installation by hoisting through the first mounting block 9. Compared with the backplate installation method, there are more installation points and it is more stable during installation. At the same time, the structure is simple, the pressure on the drive is small, and it is more stable and not easy to damage during use.

[0031] Furthermore, a shielding box 16 is fixedly installed on the fan mounting duct 1, and the shielding box 16 shields the first rotating motor 15 and the second gear 14. A first roller 17 is rotatably installed in an array at the annular groove 13, and the transmission gear ring 12 is against the first roller 17. A turbine blade 18 is fixedly installed on the rotating shaft between the ventilation fans 2. The shielding box 16 can shield and protect the first rotating motor 15 and the second gear 14. When in use, impurities and the like will not enter the second gear 14, thereby increasing the stability of the equipment when in use, and the first roller 17 is connected to the transmission gear ring 12. The friction between the transmission gear ring 12 and the fan mounting air duct 1 during rotation can be greatly reduced, thereby achieving stable rotation of the transmission gear ring 12. The arranged turbine blades 18 can greatly increase the circulation speed of air without the obstruction of the back plate. Even if blockage occurs at the second ventilation slot 8, a strong pressure can be generated to enable the air to circulate, thereby increasing the stability of the equipment during use. Moreover, the contact area between the first roller 17 and the transmission gear ring 12 is small, and rolling friction is used instead of sliding friction during operation, which can extend the service life of the transmission gear ring 12.

[0032] Further, the extension mechanism includes a sliding groove 19, two sets of sliding grooves 19 are opened on the lower side of the ventilation installation air duct 3, a sliding block 20 is slidably installed in the sliding groove 19, a second roller 21 is rotatably installed on the lower side of the sliding block 20, the second roller 21 is against the sliding groove 19, a second fixed block 22 is fixedly installed on the lower end of the sliding block 20, a connecting block 23 is fixedly installed on the second fixed block 22, a limit plate 24 is fixedly installed on the lower side of the ventilation installation port 6, the limit plate 24 is against the limit installation ring 4, a rack 25 is fixedly installed on the connecting block 23, and the two sets of racks 25 are relative to each other. For the arrangement, a motor mounting groove 26 is provided on the lower side of the ventilation installation air duct 3, a second rotating motor 27 is fixedly installed in the motor mounting groove 26, a third gear 28 is fixedly installed on the output shaft of the second rotating motor 27, the third gear 28 is meshed with the two sets of racks 25, a second filter block 32 is hinged on the second roller 21, a third fixed block 33 is fixedly installed on the left and right sides of the limit plate 24, the second filter block 32 is hinged on the upper side of the third fixed block 33, when the structure is used, the second rotating motor 27 is started to drive the third gear 28 to rotate, and the third gear 28 rotates through The meshing between the rack 25 drives the rack 25 to move relative to each other, thereby making the second fixed block 22 move relative to each other. At this time, the sliding block 20 slides in the sliding groove 19, and the second roller 21 rolls in the sliding groove 19, so that the second filter block 32 gradually becomes vertical, driving the third fixed block 33 to descend, thereby stretching the telescopic flexible air duct 5. At this time, the ventilation installation port 6 descends. At this time, the ventilation installation port 6 is detached from the limiting installation ring 4, so that the first ventilation slot 7 is not covered, until the second fixed block 22 moves to the second ventilation slot 8 to seal the second ventilation slot 8. At this time, air needs to be drawn from The rack 25 is in contact with the rear side of the ventilation duct 3 without any extra protruding structure. The length of the rack 25 is half of the length of the ventilation duct 3. During use, the rack 25 will not move to other positions, thereby increasing the stability of the equipment during use. During operation of the equipment, the two sets of second fixed blocks 22 move relative to each other, thereby tilting the second filter block 32, thereby unfolding the telescopic soft air duct 5, and the ventilation mounting port 6 descends for ventilation.

[0033] Furthermore, the filtering mechanism includes a first filter block 29, which is fixedly installed in the ventilation mounting port 6, the upper end of the telescopic flexible air duct 5 is fixedly installed in the limiting mounting ring 4, and the remaining part of the telescopic flexible air duct 5 is not fixedly connected to the limiting mounting ring 4. A shielding block 30 is provided on the lower side of the second ventilation slot 8, and a ventilation hole 31 is provided in an array on the upper side of the shielding block 30. A second filter block 32 is provided in the shielding block 30. This structure enables the equipment to be filtered regardless of whether it is ventilated through the second ventilation slot 8 or through the ventilation mounting port 6, thereby increasing the degree of dust filtration when the equipment is in use.

[0034] Furthermore, mounting grooves 34 are provided on the left and right sides of the shielding block 30, and a rotating rod 35 is rotatably installed in the mounting groove 34. A torsion spring 36 is provided on the rotating shaft of the rotating rod 35, and a stop block 37 is fixedly installed at one end of the rotating rod 35, and the stop block 37 abuts against the lower side of the second filter block 32. This structure allows the second filter block 32 to be replaced, and the replacement process is very convenient. Moreover, the rotating rod 35 is blocked by the mounting groove 34 and cannot rotate downward. The second filter block 32 can be replaced and disassembled when the rotating rod 35 needs to be rotated so that the stop block 37 is not on the lower side of the second filter block 32, thereby increasing the convenience of using the equipment.

[0035] Furthermore, the shielding block 30 is fixedly installed on the second filter block 32. The size of the shielding block 30 is larger than the second ventilation slot 8 and fits closely with the second ventilation slot 8. The size of the second ventilation slot 8 is adapted to the size of the second fixing block 22. This structure enables the shielding block 30 to no longer shield the second ventilation slot 8 and to descend to the lower side during the descending process of the ventilation mounting port 6, so that the second filter block 32 in the shielding block 30 can be easily replaced, and the second fixing block 22 can close the second ventilation slot 8, thereby increasing the ventilation efficiency of the ventilation mounting port 6 when in use.

[0036] Furthermore, the opposite side of the third fixing block 33 is adapted to the shape of the outer side of the limit mounting ring 4, and the third fixing block 33 is hollowed out as a whole and is elastic. This structure allows the ventilation mounting port 6 to be guided by the third fixing block 33 when it descends. At the same time, the third fixing block 33 will not block the descent of the ventilation mounting port 6, and the hollowing out of the third fixing block 33 can reduce the weight of the third fixing block 33. The elasticity of the third fixing block 33 can adapt to the situation where the ventilation mounting port 6 is squeezed and deformed by the third fixing block 33 during the descent.

[0037] Furthermore, the first gear 11 and the second gear 14 are of the same size, there is an obvious distance between the ventilation fan 2 and the turbine blades 18, and the first mounting block 9 is fixedly mounted on the upper side of the inner wall of the fan mounting duct 1. This structure enables the first rotating motor 15 to stably drive the ventilation fan 2 to rotate, and the obvious distance allows the ventilation fan 2 to have space for air circulation, thereby increasing the stability of the equipment during use.

[0038] Furthermore, the mounting mechanism includes a mounting frame 38, and the mounting frame 38 is fixedly mounted on the end of the fan mounting duct 1, and mounting holes 39 are opened at the four corners of the mounting frame 38. Four groups of second mounting blocks 40 are fixedly mounted on the upper side of the ventilation mounting duct 3, and a mounting rod 41 is movably inserted in the second mounting block 40, and a mounting hole 39 is opened at the upper end of the mounting rod 41. This structure allows the fan mounting duct 1 to be assembled and spliced, and the entire equipment can be hoisted or side-mounted, which increases the convenience and adaptability of the equipment when used.

[0039] Working principle: When the equipment is in use, the mounting rod 41 is inserted into the mounting hole 39, and the mounting rod 41 is inserted into the second mounting block 40 and fixed to the wall by bolts, and then the first rotating motor 15 is started, and the output shaft of the first rotating motor 15 drives the second gear 14 to rotate, and the second gear 14 drives the transmission gear ring 12 to rotate through meshing, at this time, the transmission gear ring 12 rotates in the annular groove 13, and the transmission gear ring 12 rotates against the first roller 17, and the rotation of the transmission gear ring 12 drives the first gear 11 to rotate, thereby driving the ventilation fan 2 and the turbine blades 18 to rotate, at this time, the ventilation fan 2 rotates relative to the first mounting block 9, and exhausts air outward during the rotation process, and negative pressure is formed in the fan mounting duct 1 and the ventilation mounting duct 3, thereby sucking air from the second ventilation slot 8 for ventilation, and when the ventilation mounting port 6 needs to be lowered, the second rotating motor 27 is started to drive the third gear 28 to rotate, and the rotation of the third gear 28 drives the rack 25 to move relative to each other through meshing with the rack 25, so as to achieve ventilation. The second fixed block 22 moves relatively, and the sliding block 20 slides in the sliding groove 19 at this time, and the second roller 21 rolls in the sliding groove 19, so that the second filter block 32 gradually becomes vertical, driving the third fixed block 33 to descend, thereby stretching the telescopic soft air duct 5, and the ventilation mounting port 6 descends at this time. At this time, the ventilation mounting port 6 is detached from the limiting mounting ring 4, so that the first ventilation slot 7 is not shielded, until the second fixed block 22 moves the second ventilation slot 8 to seal the second ventilation slot 8. At this time, air needs to enter from the first ventilation slot 7 and be filtered by the first filter block 29, so as to realize ventilation of the lower side air. When the ventilation mounting port 6 does not descend, the shielding block 30 is in the second ventilation slot 8, and air exchange can be carried out through the ventilation hole 31, and the second filter block 32 can filter the air. After the ventilation mounting port 6 descends, the rotating rod 35 can be rotated so that the abutting block 37 does not abut against the second filter block 32 to realize the disassembly of the second filter block 32. The above is the entire working principle of the present invention.

[0040] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A closed space ventilation device, comprising a fan installation duct (1), wherein a ventilation fan (2) is rotatably installed in the fan installation duct (1), characterized in that: The fan mounting duct (1) is fixedly mounted with a ventilation mounting duct (3); a limit mounting ring (4) is fixedly mounted at the center position of the lower side of the ventilation mounting duct (3); a telescopic flexible duct (5) is mounted in the limit mounting ring (4); a ventilation mounting opening (6) is fixedly mounted at the lower end of the telescopic flexible duct (5); a first ventilation slot (7) is provided on the ventilation mounting opening (6); two groups of second ventilation slots (8) are provided on the lower side of the ventilation mounting duct (3); a driving mechanism is provided on the fan mounting duct (1); an extension mechanism is provided on the lower side of the ventilation mounting duct (3); a filtering mechanism is provided at the second ventilation slot (8); and mounting mechanisms are provided on the fan mounting duct (1) and the ventilation mounting duct (3).

2. A closed space ventilation device according to claim 1, characterized in that: The driving mechanism comprises a first mounting block (9), two groups of first mounting blocks (9) are fixedly mounted in the fan mounting air duct (1), a mounting bearing (10) is mounted at the lower end of the first mounting block (9), a rotating shaft between the ventilation fans (2) is fixedly mounted in the mounting bearing (10), a first gear (11) is fixedly mounted at the center position of the rotating shaft between the ventilation fans (2), a transmission gear ring (12) is arranged in the fan mounting air duct (1), and the first gear (11) and the transmission gear ring (12) are connected to each other. The fan mounting duct (1) is meshed with each other, an annular groove (13) is provided on the upper side of the center position in the fan mounting duct (1), the transmission gear ring (12) is rotatably mounted in the annular groove (13), a second gear (14) is provided at the center position on the upper side of the fan mounting duct (1), a first rotating motor (15) is fixedly mounted on the upper side of the fan mounting duct (1), a second gear (14) is fixedly mounted on the output shaft of the first rotating motor (15), and the second gear (14) and the transmission gear ring (12) are meshed with each other.

3. A closed space ventilation device according to claim 2, characterized in that: A shielding box (16) is fixedly mounted on the fan mounting air duct (1), the shielding box (16) shields the first rotating motor (15) and the second gear (14), a first roller (17) is rotatably mounted in an array at the annular groove (13), the transmission gear ring (12) abuts against the first roller (17), and a turbine blade (18) is fixedly mounted on the rotating shaft between the ventilation fans (2).

4. A closed space ventilation device according to claim 1, characterized in that: The extension mechanism comprises a sliding groove (19), two groups of sliding grooves (19) are provided on the lower side of the ventilation installation air duct (3), a sliding block (20) is slidably installed in the sliding groove (19), a second roller (21) is rotatably installed in an array on the lower side of the sliding block (20), the second roller (21) abuts against the sliding groove (19), a second fixed block (22) is fixedly installed on the lower end of the sliding block (20), a connecting block (23) is fixedly installed on the second fixed block (22), a limiting plate (24) is fixedly installed on the lower side of the ventilation installation port (6), the limiting plate (24) abuts against the limiting installation ring (4), the connecting block A rack (25) is fixedly mounted on the second roller (21), and two sets of racks (25) are arranged opposite to each other. A motor mounting groove (26) is provided on the lower side of the ventilation mounting air duct (3), and a second rotating motor (27) is fixedly mounted in the motor mounting groove (26). A third gear (28) is fixedly mounted on the output shaft of the second rotating motor (27), and the third gear (28) is meshed with the two sets of racks (25). A second filter block (32) is hingedly mounted on the second roller (21), and third fixed blocks (33) are fixedly mounted on the left and right sides of the limit plate (24), and the second filter block (32) is hingedly mounted on the upper side of the third fixed block (33).

5. A closed space ventilation device according to claim 1, characterized in that: The filtering mechanism comprises a first filtering block (29), the first filtering block (29) being fixedly mounted in the ventilation mounting opening (6), the upper end of the telescopic flexible air duct (5) being fixedly mounted in a limiting mounting ring (4), the remaining portion of the telescopic flexible air duct (5) not being fixedly connected to the limiting mounting ring (4), a shielding block (30) being arranged at the lower side of the second ventilation slot (8), a ventilation hole (31) being arranged in an array at the upper side of the shielding block (30), and a second filtering block (32) being arranged in the shielding block (30).

6. A closed space ventilation device according to claim 5, characterized in that: The shielding block (30) is provided with installation rotation grooves (34) on the left and right sides. A rotating rod (35) is rotatably installed in the installation rotation groove (34). A torsion spring (36) is arranged on the rotating shaft of the rotating rod (35). A stop block (37) is fixedly installed at one end of the rotating rod (35). The stop block (37) abuts against the lower side of the second filter block (32).

7. A closed space ventilation device according to claim 5, characterized in that: The shielding block (30) is fixedly mounted on the second filter block (32); the shielding block (30) is larger than the second ventilation slot (8) and fits the second ventilation slot (8); the size of the second ventilation slot (8) matches the size of the second fixing block (22).

8. A closed space ventilation device according to claim 4, characterized in that: The opposite side of the third fixing block (33) is adapted to the shape of the outer side of the limiting mounting ring (4); the third fixing block (33) is hollowed out as a whole and has elasticity.

9. A closed space ventilation device according to claim 2, characterized in that: The first gear (11) and the second gear (14) are of the same size, there is a clear distance between the ventilation fan (2) and the turbine blades (18), and the first mounting block (9) is fixedly mounted on the upper side of the inner wall of the fan mounting duct (1).

10. A closed space ventilation device according to claim 1, characterized in that: The mounting mechanism comprises a mounting frame (38), the mounting frame (38) being fixedly mounted on the end of the fan mounting air duct (1), mounting holes (39) being provided at four corners of the mounting frame (38), four groups of second mounting blocks (40) being fixedly mounted on the upper side of the ventilation mounting air duct (3), a mounting rod (41) being movably inserted into the second mounting block (40), and a mounting hole (39) being provided at the upper end of the mounting rod (41).

Images