An air ventilation device for an enclosed space
By using turbine blades and liftable ventilation installation ports in the confined space ventilation device, the problems of low ventilation efficiency and difficulty in cleaning up dust are solved, and more efficient ventilation and convenient maintenance are achieved.
Patent Information
- Application Number
- CN202411414439.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-11
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2044-10-11
AI Technical Summary
The existing confined space ventilation device has low ventilation efficiency in the lower space during ventilation, and the dust at the vent is difficult to clean and the filter layer is difficult to replace.
A confined space ventilation device is designed, using turbine blades to increase ventilation efficiency, remove the back plate to avoid air being blocked, a liftable ventilation mounting port is provided to improve ventilation efficiency of the lower space, and a second filter block is lowered for replacement when the ventilation mounting port is lowered.
It improves ventilation efficiency, reduces the pressure during the operation of the equipment, enhances the ventilation effect of the lower space, simplifies the replacement and cleaning process of the filter layer, and improves the functionality and convenience of the equipment.
Smart Images
Figure CN119245133B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of confined space ventilation, and particularly to a confined space ventilation device. Background Art
[0002] A ventilation pipe is a hollow pipe used for ventilation, mostly circular or square. The plates, profiles, and other main finished materials used in the production and installation of ventilation pipes should comply with the provisions of the design and relevant national current standards for products, and factory inspection certificates of conformity should be applied. When the materials enter the site, they should be inspected and accepted according to the relevant current national standards. Generally, the ventilation of confined spaces is mostly carried out through ventilation pipes, especially in large spaces such as factories that require ventilation.
[0003] However, in the actual use process, since the ventilation pipe is suspended on the roof, the distance between the ventilation hole and the lower space is relatively far, which reduces the ventilation efficiency of the ventilation pipe. Moreover, it makes it difficult to ventilate the lower space in a timely manner, resulting in a poor physical feeling for the personnel working in the lower layer. In addition, after long-term use of the existing ventilation device, dust will accumulate at the ventilation opening or the filter layer, which will affect the ventilation efficiency and quality. The replacement or cleaning of the existing filter layer is difficult due to the high height of the ventilation pipe, increasing the difficulty of equipment maintenance. Therefore, we propose a confined space ventilation device to solve the above problems. Summary of the Invention
[0004] The purpose of the present invention is to provide a confined space ventilation device to solve the problems of low ventilation efficiency for the lower space during ventilation and difficulty in cleaning the dust at the ventilation opening and replacing the filter layer as mentioned in the above background art.
[0005] To achieve the above purpose, the present invention provides the following technical solution: A confined space ventilation device includes a fan installation air duct. A ventilation fan is rotatably installed in the fan installation air duct. A ventilation installation air duct is fixedly installed on the fan installation air duct. A limit installation ring is fixedly installed at the central position on the lower side of the ventilation installation air duct. A telescopic flexible air duct is installed in the limit installation ring. The lower end of the telescopic flexible air duct is fixedly installed with a ventilation installation opening. A first ventilation groove is opened on the ventilation installation opening. Two groups of second ventilation grooves are opened on the lower side of the ventilation installation air duct. A driving mechanism is arranged on the fan installation air duct. An extension mechanism is arranged on the lower side of the ventilation installation air duct. A filtering mechanism is arranged at the second ventilation groove. An installation mechanism is arranged on the fan installation air duct and the ventilation installation air duct.
[0006] Preferably, the driving mechanism includes a first mounting block. Two first mounting blocks are fixedly installed in the air duct for mounting the fan. An installation bearing is installed at the lower end of the first mounting block. The rotating shaft between the ventilation fans is fixedly installed in the installation bearing. A first gear is fixedly installed at the central position of the rotating shaft between the ventilation fans. A transmission gear ring is arranged in the air duct for mounting the fan. The first gear meshes with the transmission gear ring. An annular groove is formed on the upper side of the central position in the air duct for mounting the fan. The transmission gear ring is rotatably installed in the annular groove. A second gear is arranged at the central position on the upper side of the air duct for mounting the fan. A first rotating motor is fixedly installed on the upper side of the air duct for mounting the fan. A second gear is fixedly installed on the output shaft of the first rotating motor. The second gear meshes with the transmission gear ring.
[0007] Preferably, a shielding box is fixedly installed on the air duct for mounting the fan. 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 abuts against the first roller. A turbine blade is fixedly installed on the rotating shaft between the ventilation fans.
[0008] Preferably, the extending mechanism includes a sliding groove. Two sliding grooves are formed on the lower side of the air duct for ventilation installation. A sliding block is slidably installed in the sliding groove. Second rollers are rotatably installed in an array at the lower side of the sliding block. The second rollers abut against the sliding groove. A second fixing block is fixedly installed at the lower end of the sliding block. A connecting block is fixedly installed on the second fixing block. A limiting disk is fixedly installed on the lower side of the ventilation installation opening. The limiting disk abuts against the limiting installation ring. A rack is fixedly installed on the connecting block. The two racks are arranged oppositely. A motor installation groove is formed on the lower side of the air duct for ventilation installation. A second rotating motor is fixedly installed in the motor installation groove. A third gear is fixedly installed on the output shaft of the second rotating motor. The third gear meshes with the two racks. A second filter block is hinged on the second roller. Third fixing blocks are fixedly installed on the left and right sides of the limiting disk. The second filter block is hinged on the upper side of the third fixing block.
[0009] Preferably, the filtering mechanism includes a first filter block. A first filter block is fixedly installed in the ventilation installation opening. The upper end of the telescopic flexible air duct is fixedly installed in the limiting installation ring. The rest of the telescopic flexible air duct is not fixedly connected to the limiting installation ring. A shielding block is arranged on the lower side of the second ventilation groove. Ventilation holes are formed in an array on the upper side of the shielding block. A second filter block is arranged in the shielding block.
[0010] Preferably, installation rotating grooves are formed on the left and right sides in the shielding block. A rotating rod is rotatably installed in the installation rotating groove. A torsion spring is arranged on the rotating shaft of the rotating rod. A pressing block is fixedly installed at one end of the rotating rod. The pressing block abuts against the lower side of the second filter block.
[0011] Preferably, the shielding block is fixedly installed on the second filter block. The size of the shielding block is larger than that of the second ventilation groove and fits with the second ventilation groove. The size of the second ventilation groove is adapted to the size of the second fixing block.
[0012] Preferably, the opposite side of the third fixing block is adapted to the outer shape of the limiting installation ring. The third fixing block is integrally hollowed out and has elasticity.
[0013] Preferably, the first gear and the second gear are of the same size. There is a significant distance between the ventilation fan and the turbine blade. The first mounting block is fixedly installed on the upper side of the inner wall of the fan installation air duct.
[0014] Preferably, the installation mechanism includes an installation square frame. The end of the fan installation air duct is fixedly installed with an installation square frame. Installation holes are provided at the four corners of the installation square frame. Four groups of second mounting blocks are fixedly installed on the upper side of the ventilation installation air duct. Installation rods are movably inserted into the second mounting blocks. Installation holes are provided at the upper ends of the installation rods.
[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention is provided with a turbine blade, which greatly increases the ventilation efficiency, thereby reducing the pressure during the operation of the first rotating motor. Moreover, the ventilation fan of the device is not installed with a mounting back plate, and the air will not be blocked during the circulation process, increasing the ventilation efficiency during the use of the device. In addition, the ventilation fan and the turbine blade are installed in a suspended manner, and there are two sets of installation points, so the operation is more stable. The device is also provided with a ventilation installation opening that can be lifted and lowered. After the ventilation installation opening is lowered, high-efficiency ventilation can be carried out in the lower space, and the physical feeling of the staff in the lower space is better. In case of some situations that require timely ventilation, such as excessive dust, rapid ventilation can be achieved by lowering the ventilation installation opening, increasing the functionality during the use of the device. Moreover, the lowered ventilation installation opening can bring down the second filter block, making the second filter block easy to replace and increasing the convenience during the use of the device. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0017] Figure 1 It is a front view structural schematic diagram of the present invention;
[0018] Figure 2 It is a schematic upward view of the structure of the present invention;
[0019] Figure 3 It is a schematic sectional view of the structure at the air duct where the fan of the present invention is installed;
[0020] Figure 4 It is a schematic separated view of the structure at the air duct where the fan of the present invention is installed;
[0021] Figure 5 It is a schematic unfolded view of the structure of the present invention;
[0022] Figure 6 It is a schematic view of the structure at the telescopic flexible air duct of the present invention;
[0023] Figure 7 It is a schematic sectional view of the structure at the shielding block of the present invention;
[0024] Figure 8 It is a schematic view showing the structure at the ventilation air duct installation of the present invention;
[0025] Figure 9 For the present invention Figure 4 Partial enlarged schematic view of A in it;
[0026] Figure 10 For the present invention Figure 7 Partial enlarged schematic view of A in it.
[0027] In the figure: 1. Fan installation air duct; 2. Ventilation fan; 3. Ventilation installation air duct; 4. Limit installation ring; 5. Telescopic flexible air duct; 6. Ventilation installation opening; 7. First ventilation slot; 8. Second ventilation slot; 9. First installation block; 10. Installation bearing; 11. First gear; 12. Transmission tooth ring; 13. Annular groove; 14. Second gear; 15. First rotation motor; 16. Shielding box; 17. First roller; 18. Turbine fan blade; 19. Sliding slot; 20. Sliding block; 21. Second roller; 22. Second fixing block; 23. Connecting block; 24. Limit disc; 25. Rack; 26. Motor installation slot; 27. Second rotation motor; 28. Third gear; 29. First filter block; 30. Shielding block; 31. Ventilation hole; 32. Second filter block; 33. Third fixing block; 34. Installation rotating slot; 35. Rotating rod; 36. Torsion spring; 37. Resisting block; 38. Installation square frame; 39. Installation hole; 40. Second installation block; 41. Installation rod. Detailed implementation manners
[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
[0029] Please refer to Figures 1-10 , an embodiment provided by the present invention: a closed - space ventilation device, including a fan installation air duct 1. A ventilation fan 2 is rotatably installed in the fan installation air duct 1. A ventilation installation air duct 3 is fixedly installed on the fan installation air duct 1. A limit installation ring 4 is fixedly installed at the central position on the lower side of the ventilation installation air duct 3. A telescopic flexible air duct 5 is installed in the limit installation ring 4. The lower end of the telescopic flexible air duct 5 is fixedly installed with a ventilation installation opening 6. A first ventilation slot 7 is opened on the ventilation installation opening 6. Two groups of second ventilation slots 8 are opened on the lower side of the ventilation installation air duct 3. A driving mechanism is arranged on the fan installation air duct 1. An extension mechanism is arranged on the lower side of the ventilation installation air duct 3. A filtering mechanism is arranged at the second ventilation slot 8. An installation mechanism is arranged on the fan installation air duct 1 and the ventilation installation air duct 3. The whole of this device depends on the current general ventilation duct structure, so there is a mature technical adjustment as a support during the installation process, making it more convenient and stable during the installation process. The ventilation system of the device has been improved. The back panel for wind blocking is removed, and a turbine fan blade 18 is added to enhance the flow speed, making the ventilation efficiency of the device higher. In addition, a ventilation installation opening 6 that can be lifted is also provided. When the ventilation installation opening 6 is retracted, it is located under the ventilation installation air duct 3 and is closed by the limit installation ring 4 and will not ventilate. After unfolding, it extends downward, so that the ventilation installation opening 6 can be opened and is in the lower - side space. The original second ventilation slot 8 for ventilation will be blocked. In this way, only the ventilation installation opening 6 can be used for ventilation during the descent of the ventilation installation opening 6, increasing the ventilation efficiency of the lower - side space.
[0030] Furthermore, the drive mechanism includes a first mounting block 9. Two groups of first mounting blocks 9 are fixedly installed inside the fan mounting air duct 1. An installation 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 inside the installation bearing 10. A first gear 11 is fixedly installed at the central position of the rotating shaft between the ventilation fans 2. A transmission toothed ring 12 is arranged inside the fan mounting air duct 1. The first gear 11 meshes with the transmission toothed ring 12. An annular groove 13 is opened on the upper side of the central position inside the fan mounting air duct 1. The transmission toothed ring 12 is rotatably installed inside the annular groove 13. A second gear 14 is arranged at the central 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. The second gear 14 is fixedly installed on the output shaft of the first rotating motor 15. The second gear 14 meshes with the transmission toothed ring 12. When this structure is in use, the output shaft of the first rotating motor 15 drives the second gear 14 to rotate. The second gear 14 drives the transmission toothed ring 12 to rotate through meshing. At this time, the transmission toothed ring 12 rotates inside the annular groove 13. The rotation of the transmission toothed ring 12 drives the first gear 11 to rotate, thereby driving the ventilation fans 2 and the turbine fan blades 18 to rotate. At this time, the ventilation fans 2 rotate relative to the first mounting block 9. This structure installs the ventilation fans 2 by hoisting. This installation method can improve the ventilation efficiency compared with the backplate installation. Moreover, the transmission toothed ring 12 as a driving connection part will not block the air flow. And there are two installation points for the installation by hoisting through the first mounting block 9, which is more than the installation points of the backplate installation method and is more stable during installation. At the same time, this structure is simple, has less pressure on the drive, and is more stable and not easily damaged during use.
[0031] Furthermore, a shielding box 16 is fixedly installed 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 installed in an array at the annular groove 13. The transmission toothed ring 12 abuts against the first roller 17. A turbine fan 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. During use, it prevents impurities and the like from entering the second gear 14, increasing the stability of the equipment during use. Moreover, the contact between the first roller 17 and the transmission toothed ring 12 can greatly reduce the friction between the transmission toothed ring 12 and the fan mounting air duct 1 during rotation, thereby realizing the stable rotation of the transmission toothed ring 12. The provided turbine fan blade 18 can greatly increase the air flow speed without the obstruction of the backplate. Even when there is a blockage at the second ventilation slot 8 and other situations, it can generate a strong pressure to make the air flow, increasing the stability of the equipment during use. And the contact area between the first roller 17 and the transmission toothed ring 12 is small, and rolling friction is used instead of sliding friction during operation, which can extend the service life of the transmission toothed ring 12.
[0032] Further, the stretching mechanism includes a sliding groove 19. Two groups of sliding grooves 19 are formed in 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 fixing block 22 is fixedly installed at the lower end of the sliding block 20. A connecting block 23 is fixedly installed on the second fixing block 22. A limiting disc 24 is fixedly installed on the lower side of the ventilation installation opening 6. The limiting disc 24 abuts against the limiting installation ring 4. A rack 25 is fixedly installed on the connecting block 23. The two racks 25 are arranged oppositely. A motor installation groove 26 is formed in the lower side of the ventilation installation air duct 3. A second rotating motor 27 is fixedly installed in the motor installation groove 26. A third gear 28 is fixedly installed on the output shaft of the second rotating motor 27. The third gear 28 meshes with the two racks 25. A second filter block 32 is hinged on the second roller 21. Third fixing blocks 33 are fixedly installed on the left and right sides of the limiting disc 24. The second filter block 32 is hinged on the upper side of the third fixing block 33. When this structure is in use, the second rotating motor 27 is started to drive the third gear 28 to rotate. The rotation of the third gear 28 drives the racks 25 to move relatively through the meshing with the racks 25, so that the second fixing block 22 moves relatively. 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 fixing block 33 to descend, thereby stretching the telescopic flexible air duct 5. At this time, the ventilation installation opening 6 descends, and the ventilation installation opening 6 is disengaged from the limiting installation ring 4, so that the first ventilation groove 7 is not blocked, until the second fixing block 22 moves to the second ventilation groove 8 to seal the second ventilation groove 8. At this time, air needs to enter from the first ventilation groove 7. When this structure is not unfolded, the ventilation installation opening 6 is located on the lower side of the ventilation installation air duct 3. At the same time, the rack 25 also fits against the rear side of the ventilation installation air duct 3. There is no redundant protruding structure. The length of the rack 25 is half of the length of the ventilation installation air duct 3. During the use process, the rack 25 will not move to other positions, increasing the stability of the equipment during use. During the operation of the equipment, the two second fixing blocks 22 move relatively, so that the second filter block 32 is inclined, so that the telescopic flexible air duct 5 is unfolded, and the ventilation installation opening 6 descends for ventilation.
[0033] Further, the filtering mechanism includes a first filter block 29. The first filter block 29 is fixedly installed in the ventilation installation opening 6. The upper end of the telescopic flexible air duct 5 is fixedly installed in the limiting installation ring 4, and the rest of the telescopic flexible air duct 5 is not fixedly connected to the limiting installation ring 4. A shielding block 30 is arranged on the lower side of the second ventilation groove 8. Ventilation holes 31 are formed in an array on the upper side of the shielding block 30. A second filter block 32 is arranged in the shielding block 30. This structure enables the equipment to be filtered whether it ventilates through the second ventilation groove 8 or through the ventilation installation opening 6, increasing the dust filtering degree of the equipment during use.
[0034] Further, installation rotation grooves 34 are formed on the left and right sides inside the shielding block 30. A rotating rod 35 is rotatably installed in the installation rotation grooves 34. A torsion spring 36 is arranged on the rotating shaft of the rotating rod 35. One end of the rotating rod 35 is fixedly installed with an abutting block 37. The abutting block 37 abuts against the lower side of the second filter block 32. This structure enables the second filter block 32 to be replaced, and during the replacement process, it is very convenient. Moreover, the rotating rod 35 is blocked by the installation rotation grooves 34 and cannot rotate downward. When it is necessary to rotate the rotating rod 35 so that the abutting block 37 is not located on the lower side of the second filter block 32, the replacement and disassembly of the second filter block 32 can be completed, increasing the convenience during the use of the device.
[0035] Further, the shielding block 30 is fixedly installed on the second filter block 32. The size of the shielding block 30 is larger than that of the second ventilation groove 8 and fits with the second ventilation groove 8. The size of the second ventilation groove 8 is adapted to the size of the second fixing block 22. This structure enables the shielding block 30 not to shield the second ventilation groove 8 and descend to the lower side during the descent of the ventilation installation opening 6, so that the second filter block 32 inside the shielding block 30 can be replaced conveniently. And the second fixing block 22 can seal the second ventilation groove 8, which can increase the ventilation efficiency when the ventilation installation opening 6 is in use.
[0036] Further, the opposite sides of the third fixing block 33 are adapted to the shape of the outer side of the limit installation ring 4. The third fixing block 33 is integrally hollow and has elasticity. This structure enables the ventilation installation opening 6 to be guided by the third fixing block 33 when descending. At the same time, the third fixing block 33 does not block the descent of the ventilation installation opening 6. Moreover, the hollow of the third fixing block 33 can reduce the weight of the third fixing block 33, and its inherent elasticity can adapt to the situation where the third fixing block 33 deforms when the ventilation installation opening 6 is squeezed during the descent process.
[0037] Further, the first gear 11 and the second gear 14 are of the same size. There is a significant gap between the ventilation fan 2 and the turbine fan blade 18. The first installation block 9 is fixedly installed on the upper side of the inner wall of the fan installation air duct 1. This structure enables the first rotating motor 15 to stably drive the ventilation fan 2 to rotate, and the obvious gap can enable the ventilation fan 2 to have space for air circulation, increasing the stability during the use of the device.
[0038] Furthermore, the installation mechanism includes an installation square frame 38. The end of the fan installation air duct 1 is fixedly installed with the installation square frame 38. Installation holes 39 are opened at the four corners of the installation square frame 38. Four groups of second installation blocks 40 are fixedly installed on the upper side of the ventilation installation air duct 3. Installation rods 41 are movably inserted into the second installation blocks 40. Installation holes 39 are opened at the upper ends of the installation rods 41. This structure enables the assembly of the fan installation air ducts 1, and the overall equipment can be hoisted or side-mounted, increasing the convenience and adaptability of the equipment during use.
[0039] Working principle: When the equipment is in use, the installation rod 41 is inserted into the second installation block 40 through the installation hole 39 and fixed to the wall with bolts. Then, the first rotation motor 15 is started. The output shaft of the first rotation motor 15 drives the second gear 14 to rotate. 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 abuts against the first roller 17 and rotates. The rotation of the transmission gear ring 12 drives the first gear 11 to rotate, thereby driving the ventilation fan 2 and the turbine fan blade 18 to rotate. At this time, the ventilation fan 2 rotates relative to the first installation block 9 and discharges air outward during rotation. A negative pressure is formed in the fan installation air duct 1 and the ventilation installation air duct 3, so that air is sucked from the second ventilation slot 8 for ventilation and air exchange. When the ventilation installation opening 6 needs to be lowered, the second rotation motor 27 is started to drive the third gear 28 to rotate. The rotation of the third gear 28 drives the rack 25 to move relatively through meshing with the rack 25, so that the second fixing block 22 moves relatively. At this time, the sliding block 20 slides in the sliding slot 19, and the second roller 21 rolls in the sliding slot 19, so that the second filter block 32 gradually becomes vertical, driving the third fixing block 33 to descend, thereby stretching the telescopic flexible air duct 5. At this time, the ventilation installation opening 6 descends. At this time, the ventilation installation opening 6 disengages from the limit installation ring 4, so that the first ventilation slot 7 is not blocked. Until the second fixing block 22 moves to 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, realizing the ventilation of the lower-side air. When the ventilation installation opening 6 does not descend, the shielding block 30 is at the second ventilation slot 8, and air exchange can be carried out through the ventilation holes 31, and the second filter block 32 can filter air. After the ventilation installation opening 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 is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.
Claims
1. A closed space ventilation device, comprising a fan mounting duct (1), wherein a ventilation fan (2) is rotatably mounted in the fan mounting 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); 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 the 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); The shielding block (30) is provided with mounting grooves (34) on both left and right sides. A rotating rod (35) is rotatably mounted in the mounting groove (34). A torsion spring (36) is provided on the rotating shaft of the rotating rod (35). A stop block (37) is fixedly mounted on one end of the rotating rod (35). The stop block (37) abuts against the lower side of the second filter block (32).
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), 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 mounted in the annular groove (13), a second gear (14) is arranged at the center position on the upper side of the fan mounting air duct (1), a first rotating motor (15) is fixedly mounted on the upper side of the fan mounting air 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 opening (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 the 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) and the two sets of racks (25) are meshed with each other. A second filter block (32) is hingedly mounted on the second roller (21), and third fixing 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 fixing block (33).
5. A closed space ventilation device according to claim 1, 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).
6. 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.
7. 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).
8. 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 sets 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).
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