Fan base with viewing aperture

Abstract

The application discloses a fan base with an observation hole, which comprises a base body and an annular seat, the annular seat is sleeved outside the base body, the upper end of the base body is provided with an upper thickened plate, the lower end of the base body is provided with a lower thickened plate, the annular seat is located between the upper thickened plate and the lower thickened plate, the lower end surface of the upper thickened plate is provided with an upper T-shaped sliding groove, the upper end surface of the lower thickened plate is provided with a lower T-shaped sliding groove, three groups of through holes are formed in the side wall of the base body, the upper end of the annular seat is provided with an upper convex strip, the upper convex strip is embedded in the upper T-shaped sliding groove and is in sliding connection with the upper T-shaped sliding groove. The technical key points are that three groups of through holes are uniformly distributed in the circumference of the side wall of the base body, the annular seat and the observation steel pipe which can slide in the circumference are matched, the observation point can be flexibly switched, the fireproof damper can be multi-angle inspected, and the faults of the damper plate, the sealing element, the transmission mechanism and other components can be comprehensively checked.

Description

Technical Field

[0001] This invention relates to the field of marine ventilation equipment technology, and in particular to a fan base with an observation hole. Background Technology

[0002] Ship ventilation systems are crucial supporting facilities for ensuring safe navigation and normal use of cabins. Fire dampers, as core safety components of the ventilation system, can prevent the spread of fire and smoke along ventilation ducts in the event of a fire. They are an indispensable device in the ship's fire safety system. Major classification societies and port state control (PSC) have imposed strict inspection and maintenance requirements on fire dampers, stipulating that such equipment must have good accessibility to facilitate routine inspections, functional tests, and troubleshooting by personnel. The internal condition of the equipment must also be effectively verified; otherwise, it is very easy to be judged as a defective equipment during the statutory inspection process, affecting the normal operation of the ship.

[0003] Currently, the industry commonly uses inspection and observation ports on ventilation ducts to observe and inspect the internal structure and gate condition of fire dampers. This method is technically mature, easy to operate, and meets the needs of conventional ship types. However, in the design of some ships' fan-supporting structures, the fire damper is directly connected to the fan and fan base. After the two are tightly assembled, there is no extra space around it to lay out ventilation ducts. The traditional solution of setting up observation and inspection structures based on ventilation ducts cannot be implemented. Under such conditions, it is difficult for staff to visually inspect the internal condition of the fire damper and to promptly troubleshoot common problems such as gate jamming, seal failure, and transmission component failure. This not only significantly increases the difficulty of daily equipment operation and maintenance but also leads to a higher risk of defects in classification society inspections and port state control inspections, making it difficult to meet current ship safety inspection standards.

[0004] The industry currently lacks a simple, efficient, and adaptable solution to the challenges of observation and maintenance arising from the direct connection between ventilation fans and fire dampers. Conventional modification methods suffer from structural complexity, high costs, and disruption to normal fan operation. Therefore, designing a fan base suitable for such special installation conditions and capable of directly enabling observation inside the fire damper has become an urgent need for the optimized design of ship ventilation equipment. Summary of the Invention

[0005] Technical problems to be solved: To address the shortcomings of existing technologies, this invention provides a fan base with observation holes. Three sets of through holes are evenly distributed around the circumference of the base sidewall. Combined with a circumferentially sliding annular seat and observation steel pipe, the observation points can be flexibly switched, enabling multi-angle inspection of the fireproof air damper. This allows for comprehensive troubleshooting of components such as the damper, seals, and transmission mechanisms, thus solving the technical problems mentioned in the background art.

[0006] Technical solution: To achieve the above objectives, the present invention provides the following technical solution: A fan base with an observation hole includes a base body and an annular seat. The annular seat is sleeved on the outside of the base body. An upper thickened plate is provided at the upper end of the base body, and a lower thickened plate is provided at the lower end of the base body. The annular seat is located between the upper and lower thickened plates. An upper T-shaped groove is formed on the lower end face of the upper thickened plate, and a lower T-shaped groove is formed on the upper end face of the lower thickened plate. Three sets of through holes are formed on the side wall of the base body. An upper protruding strip is provided at the upper end of the annular seat. The upper protruding strip is embedded in the upper T-shaped groove and slidably connected to the upper T-shaped groove. A lower protruding strip is provided at the lower end of the annular seat. The lower protruding strip is embedded in the lower T-shaped groove and slidably connected to the lower T-shaped groove. A steel pipe is provided on the annular seat, and a blind plate is installed at one end of the steel pipe.

[0007] In one possible implementation, the base body is located at the bottom of the fireproof air damper, and the fireproof air damper is located at the bottom of the fan.

[0008] In one possible implementation, elbow plates are welded and fixed to the inner wall of the base body, and eight sets of elbow plates are provided, with the eight sets of elbow plates evenly distributed at intervals along the circumference of the base body.

[0009] In one possible implementation, the three sets of through holes are evenly distributed along the circumference of the base body, and the inner diameter of the steel pipe is larger than the diameter of the through holes.

[0010] In one possible implementation, a rubber liner is provided on the inner side of the annular seat, the rubber liner is bonded and fixed to the annular seat, and the rubber liner is tightly fitted to the outer wall of the base body.

[0011] In one possible implementation, a first connecting seat is provided on one side of the steel pipe, and a second connecting seat is provided on the other side of the steel pipe. A rotating shaft is installed on the first connecting seat and is rotatably connected to the first connecting seat. A connecting sleeve is fixedly sleeved on the rotating shaft, and a screw is fixedly connected to the connecting sleeve. A locking nut is threaded onto the screw.

[0012] In one possible implementation, a connecting arm is provided at one end of the blind plate, and a connecting plate is provided at the other end of the blind plate, with a slot provided on the connecting plate.

[0013] In one possible implementation, the connecting arm of the blind plate is hinged to the second connecting seat of the steel pipe.

[0014] In one possible implementation, a sealing liner is provided on the inner side of the blind plate, and the sealing liner is bonded and fixedly connected to the blind plate.

[0015] In one possible implementation, a flange ring is provided at the top of the base body, the upper end face of the flange ring is in contact with the lower end face of the fireproof damper, and the fireproof damper and the flange ring are locked together by a circumferentially distributed bolt assembly.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention has three sets of through holes evenly distributed around the circumference of the base side wall, which are combined with a circumferentially sliding annular seat and observation steel pipe, allowing for flexible switching of observation points and enabling multi-angle inspection of the fireproof air damper. It can also comprehensively check for faults in components such as the gate, seals, and transmission mechanism.

[0017] 2. The blind flange of the present invention adopts a hinged integrated structure, which is combined with a screw and a locking nut to form a quick locking mechanism. There is no need to disassemble and assemble scattered bolts. The opening, closing and locking operations are simple and can be completed by a single person, thus improving inspection efficiency.

[0018] 3. The inner side of the annular seat of the present invention is bonded with a rubber liner to fill the assembly gap and achieve circumferential sealing. The inner side of the blind plate is equipped with a sealing liner, which can block the observation channel after closing. The multi-layer sealing structure works together to effectively avoid leakage of ventilation airflow and ensure the normal operation of the ventilation system. Attached Figure Description

[0019] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0020] Figure 1 This is a top view of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the invention from a bottom view. Figure 3 This is a schematic diagram of the installation of the present invention; Figure 4 This is a top view of the main body of the base of the present invention. Figure 5 This is a bottom view of the base structure of the present invention; Figure 6 This is a top view of the annular seat structure of the present invention; Figure 7 This is a bottom view of the annular seat structure of the present invention; Figure 8 This is a partial cross-sectional view of the base body and the annular seat of the present invention; Figure 9 for Figure 8 Enlarged view of a portion of area A in the middle; Figure 10 This is a schematic diagram of the steel pipe and blind flange of the present invention.

[0021] In the diagram: 1. Base body; 2. Ring seat; 3. Elbow plate; 4. Steel pipe; 5. Blind flange; 6. Flange ring; 7. Fireproof air damper; 8. Fan; 11. Upper thickened plate; 12. Lower thickened plate; 13. Upper T-shaped slide groove; 14. Lower T-shaped slide groove; 15. Through hole; 21. Upper convex strip; 22. Lower convex strip; 23. Rubber liner; 41. First connecting seat; 42. Second connecting seat; 43. Connecting sleeve; 44. Screw; 45. Locking nut; 51. Connecting arm; 52. Connecting plate; 53. Groove; 54. Sealing liner. Detailed Implementation

[0022] This application provides a fan base with observation holes. Three sets of through holes are evenly distributed around the circumference of the base side wall. Combined with a circumferentially sliding annular seat and observation steel pipe, the observation points can be flexibly switched, enabling multi-angle inspection of the fireproof air damper. This allows for comprehensive troubleshooting of components such as the damper, seals, and transmission mechanism, thus solving the technical problems mentioned in the background art.

[0023] The technical solution in this application embodiment is to solve the problems mentioned in the background art, and the overall idea is as follows: Example 1: Please see Figure 1-10 This invention provides a technical solution: a fan base with an observation hole, comprising a base body 1 and an annular seat 2, the annular seat 2 being sleeved on the outside of the base body 1. An upper thickening plate 11 is provided at the upper end of the base body 1, and a lower thickening plate 12 is provided at the lower end of the base body 1. The annular seat 2 is located between the upper thickening plate 11 and the lower thickening plate 12. An upper T-shaped groove 13 is formed on the lower end face of the upper thickening plate 11, and a lower T-shaped groove 13 is formed on the upper end face of the lower thickening plate 12. The T-shaped slide 14 has three sets of through holes 15 on the side wall of the base body 1. The upper end of the annular seat 2 is provided with an upper protrusion 21, which is embedded in the upper T-shaped slide 13 and slidably connected with the upper T-shaped slide 13. The lower end of the annular seat 2 is provided with a lower protrusion 22, which is embedded in the lower T-shaped slide 14 and slidably connected with the lower T-shaped slide 14. A steel pipe 4 is provided on the annular seat 2, and a blind plate 5 is installed at one end of the steel pipe 4.

[0024] In some examples, the base body 1 is located at the bottom of the fireproof damper 7, which is located at the bottom of the fan 8.

[0025] The base body 1 is mainly used in the ship ventilation system and is installed below the fan 8 and the fireproof damper 7. It serves as the load-bearing base and auxiliary maintenance structure for the entire set of equipment. The overall assembly relationship of the equipment is that the base body 1 is arranged at the bottom of the fireproof damper 7, and the fireproof damper 7 is installed at the bottom of the fan 8. The three are arranged from top to bottom as fan 8, fireproof damper 7, and base body 1. The top of the base body 1 is reliably connected to the fireproof damper 7 through the flange ring 6.

[0026] Three sets of through holes 15 are arranged in a 120° ring to form the basic observation channel. The annular seat 2 is fitted on the outside of the base body 1. The annular seat 2 is limited between the upper thickened plate 11 at the upper end and the lower thickened plate 12 at the lower end of the base. The annular seat 2 cannot move up and down, but can only slide circumferentially along the outer wall of the base body 1. The sliding groove and the convex strip of the T-shaped structure cooperate with each other to realize the sliding guidance function and prevent the annular seat 2 from falling off or shifting under the action of vibration and wind pressure. The annular seat 2 is limited to moving smoothly circumferentially along the preset trajectory.

[0027] When staff need to inspect and patrol the internal working conditions of the fireproof air damper 7, they can use the circumferential sliding characteristic of the ring seat 2 to complete multi-angle observation operations. A steel pipe 4 is fixedly installed on the ring seat 2. The steel pipe 4 serves as the main observation channel, and the inner diameter of the steel pipe 4 is larger than the diameter of the through hole 15 on the side wall of the base body 1, which can completely cover the through hole 15, ensuring an unobstructed observation field of view and facilitating the smooth insertion of maintenance accessories such as telescopic rods and endoscopic tools into the equipment.

[0028] Under normal conditions, the annular seat 2 can remain in any initial position, with the steel pipe 4 aligned with one of the through holes 15 to form a continuous observation channel. If it is necessary to switch the observation point, the staff only needs to manually push the annular seat 2. Relying on the guiding action of the upper and lower sets of convex strips and the upper and lower sets of T-shaped sliding grooves, the annular seat 2 can slide smoothly circumferentially along the outer wall of the base body 1. Since the three sets of through holes 15 are evenly distributed around the circumference, the annular seat 2 can be slid to the corresponding position in sequence, so that the steel pipe 4 is aligned with the three sets of through holes 15 one by one. The internal structure of the fireproof air damper 7 above can be observed from three different directions through the through holes 15 and the steel pipe 4, including the status of the damper, the integrity of the seals, the operation of the transmission mechanism and other key parts. This completely solves the problem of limited field of view and blind spots in traditional fixed observation holes.

[0029] The entire sliding process does not require disassembling the main body of the annular seat 2. The T-shaped sliding structure operates smoothly, and a single person can complete the point switching. The inspection process is simple and efficient. After completing the full-angle observation, under the damping force of the rubber liner 23, the annular seat 2 can be stopped at any position corresponding to the through hole 15 and enter the normal sealed operation mode.

[0030] In some examples, elbow plates 3 are welded and fixed to the inner wall of the base body 1. There are eight sets of elbow plates 3, which are evenly distributed along the circumference of the base body 1. The positions of the eight sets of elbow plates 3 avoid the positions of the three sets of through holes 15, so as not to block the through holes 15. The reinforcement elbow plates 3 are arranged on the inner wall of the base body 1, so that the outer wall of the base body 1 remains intact and flat, providing sufficient space for the ring seat 2 to slide around the whole circle. This completely avoids the interference problem between the external reinforcing rib and the sliding component. All observation, sliding and locking structures are integrated in the limited space outside the base, without occupying the small space of the ship's engine room, which is suitable for the design characteristics of the compact layout of ship equipment.

[0031] The upper thickening plate 11 and the lower thickening plate 12 are added to the upper and lower ends of the base body 1, respectively. This structural design will not weaken the overall rigidity of the base body 1, but will further strengthen the base body 1. The main function of the thickening plate is to open the T-shaped groove and axially limit the ring seat 2. The thickening plate itself has a larger plate thickness and better bending and torsional resistance. It can form a rigid constraint on the upper and lower ends of the base body 1, effectively suppressing deformation and warping at the end position. The thickening plate only locally extends the groove structure without damaging the base body 1. The original complete load-bearing structure of the base body 1 is preserved, and the eight sets of evenly distributed elbow plates 3 on the inner wall can play a normal strengthening role.

[0032] The base body 1 serves as the core load-bearing component, with eight sets of elbow plates 3 evenly welded around its inner circumference. The elbow plates 3 adopt an integrated welded structure, providing all-round reinforcement and support for the base body 1. Ships generate continuous vibrations during navigation, and the operation of the fan 8 also causes mechanical vibrations. The evenly distributed elbow plates 3 can significantly improve the structural rigidity, deformation resistance, and vibration resistance of the base body 1, avoiding problems such as deformation and weld cracking caused by long-term load and vibration, and ensuring the long-term stable operation of the entire equipment.

[0033] In some examples, three sets of through holes 15 are evenly distributed along the circumference of the base body 1. The inner diameter of the steel pipe 4 is larger than the diameter of the through holes 15, which can completely cover the through holes 15 and ensure that the observation field is unobstructed.

[0034] In some examples, the inner side of the annular seat 2 is provided with a rubber liner 23, which is bonded and fixed to the annular seat 2 and is tightly fitted to the outer wall of the base body 1.

[0035] A rubber liner 23 is bonded and fixed to the inner side of the annular seat 2. The rubber liner 23 fits the outer wall of the base body 1 as a whole. On the one hand, the rubber liner 23 can fill the assembly gap between the annular seat 2 and the base body 1, reducing the wear and operating noise caused by direct friction between metal parts. On the other hand, the rubber liner 23 has an elastic sealing function, which can prevent airflow from leaking out from the gap between the annular seat 2 and the base body 1. At the same time, it relies on its own friction to assist in positioning, further weakening the impact of ship vibration on the position of the annular seat 2.

[0036] All components are made of conventional materials such as general-purpose steel plates and standard fasteners for ships, without the need for special custom parts. Welding, machining, and bonding are all conventional processes in the shipbuilding industry, with low processing difficulty. Whether it is for the production of new ships or the renovation of old bases of in-service ships, it is easy to carry out on-site construction, and the renovation and production costs are controllable, which makes it possible to carry out large-scale production. The dimensions of the base body 1 and flange ring 6 can be flexibly matched according to different specifications of fireproof air dampers 7 and fans 8.

[0037] By adopting the above technical solution: The base body 1 is reinforced by eight sets of evenly distributed elbow plates 3 on its inner wall, effectively improving the structural strength and vibration resistance of the base body 1. It can withstand the weight of the fan 8 and the fireproof airlock 7 for a long time, as well as the alternating vibrations generated by ship navigation and equipment operation, avoiding structural deformation and weld failure. The annular seat 2 forms a limiting sliding pair with two sets of upper and lower convex strips and two sets of upper and lower T-shaped sliding grooves. The annular seat 2 can only move smoothly along the circumference of the base body 1, without vertical movement or falling off, greatly improving operational stability. Three sets of through holes 15 are evenly distributed along the circumference of the base body 1. The evenly arranged, sliding annular seat 2 and observation steel pipe 4 allow for flexible switching of observation positions, eliminating blind spots in the field of view of traditional fixed observation holes, and providing a comprehensive inspection of the internal working conditions of the fireproof airlock 7. The rubber lining 23 bonded to the inner side of the annular seat 2 fills the assembly gaps, reduces metal friction loss and operating noise, and forms an annular sealing structure to effectively prevent airflow from leaking out from the gaps between components, ensuring the airtightness of the ventilation system. The entire structure takes into account multiple functions such as load-bearing, sliding, observation and sealing, adapts to the complex working conditions of the ship's engine room, and significantly enhances its reliability.

[0038] Example 2: Based on Example 1, this example describes the specific structure of the steel pipe 4 and the blind plate 5 in a fan base with an observation hole. A first connecting seat 41 is provided on one side of the steel pipe 4, and a second connecting seat 42 is provided on the other side of the steel pipe 4. A rotating shaft is installed on the first connecting seat 41, and the rotating shaft is rotatably connected to the first connecting seat 41. A connecting sleeve 43 is fixedly sleeved on the rotating shaft, and a screw 44 is fixedly connected to the connecting sleeve 43. A locking nut 45 is threaded on the screw 44.

[0039] In some examples, one end of the blind plate 5 is provided with a connecting arm 51, and the other end of the blind plate 5 is provided with a connecting plate 52, on which a slot 53 is provided.

[0040] In some examples, the connecting arm 51 of the blind flange 5 is hinged to the second connecting seat 42 of the steel pipe 4.

[0041] A blind plate 5 is installed at the end of the steel pipe 4 away from the base body 1. The blind plate 5 is a flip-sealed structure to realize the opening, closing and sealing of the observation channel. A connecting arm 51 is set at one end of the blind plate 5. The connecting arm 51 is hinged to the second connecting seat 42 on one side of the steel pipe 4, so that the blind plate 5 can be freely flipped around the hinge point as the axis to complete the opening and closing of the channel.

[0042] To ensure reliable locking of the blind flange 5 after it is closed, a rotatable shaft is mounted on the first connecting seat 41. A connecting sleeve 43 is fixedly sleeved on the outside of the shaft. The connecting sleeve 43 is rigidly connected to the screw 44. A locking nut 45 is provided on the screw 44. A connecting plate 52 is provided on the side of the blind flange 5 away from the hinge end. A slot 53 adapted to the screw 44 is provided on the connecting plate 52. When the blind flange 5 is fully closed, the shaft is rotated, causing the screw 44 to rotate as a whole, so that the screw 44 is inserted into the slot 53 of the connecting plate 52. Then the locking nut 45 on the screw 44 is tightened. The locking nut 45 presses the connecting plate 52 downward along the thread, and the blind flange 5 is firmly locked in the closed state by the thread preload.

[0043] This locking structure can effectively resist the loosening problem caused by ship vibration and airflow impact, and prevent the blind plate 5 from accidentally flipping open and causing air leakage. When observation operations need to be carried out again, simply loosen the locking nut 45 in the opposite direction to release the pressure limit, then rotate the screw 44 to disengage it from the slot 53 of the connecting plate 52, and finally flip the blind plate 5 to open the observation channel. The overall opening, closing, locking and unlocking operation process is smooth, easy to disassemble and assemble, and can be repeatedly used.

[0044] Traditional flanges are completely separate structures. Each time the observation channel is opened or closed, multiple fastening bolts need to be disassembled and installed one by one. The process is cumbersome and time-consuming, and bolts and gaskets are easily lost during disassembly and assembly. The blind flange 5 is hinged to the steel pipe 4 through the connecting arm 51. The blind flange 5 is always connected to the observation channel and does not need to be disassembled or stored separately. When opening or closing, the blind flange 5 only needs to be flipped over, and then the screw 44 and the locking nut 45 are used to complete the single-point locking to achieve sealing and fixation. The entire process involves fewer disassembly and assembly parts and simpler actions. A single person can quickly complete the operation, which greatly shortens the preparation time for inspection and maintenance. It is especially suitable for high-frequency inspection operations on ships.

[0045] In some examples, a sealing liner 54 is provided on the inner side of the blind flange 5. The sealing liner 54 is bonded and fixed to the blind flange 5. Both the rubber liner 23 and the sealing liner 54 can be marine-grade oil-resistant and aging-resistant nitrile rubber. Nitrile rubber has excellent oil resistance, water resistance, salt spray resistance and aging resistance. It is not easy to harden, crack or deform after long-term use and has a long service life.

[0046] A sealing liner 54 is bonded to the inside of the blind flange 5. When the blind flange 5 is flipped over and closed on the end of the steel pipe 4, the sealing liner 54 is tightly attached to the end face of the steel pipe 4, filling the gap between the joint surfaces, achieving a complete seal of the observation channel, preventing the ventilation airflow from leaking from the observation channel during the operation of the fan 8, and ensuring the stability of the ventilation system's air pressure.

[0047] In some examples, a flange ring 6 is provided at the top of the base body 1. The upper end face of the flange ring 6 is in contact with the lower end face of the fireproof damper 7. The fireproof damper 7 and the flange ring 6 are locked together by a circumferentially distributed bolt assembly. A sealing structure can be matched at the mating surface to ensure the connection strength and effectively block airflow leakage, thus meeting the airtight requirements of the ship's ventilation equipment.

[0048] The flange ring 6 is 12mm thick, the base body 1 is 10mm thick, the elbow plate 3 is 10mm thick, the steel pipe 4 has a diameter of 150mm, and the dimensions of the flange ring 6 and the base body 1 are matched with the external dimensions of the fireproof air damper 7.

[0049] By adopting the above technical solution: The blind flange 5 is hinged to the steel pipe 4 via the connecting arm 51, allowing for flexible opening and closing by flipping. Combined with the inner sealing liner 54, it achieves a complete end-face seal in the closed state, preventing air leakage in the observation channel. The clamping and locking mechanism, composed of a rotating shaft, connecting sleeve 43, screw 44, and locking nut 45, firmly locks the blind flange 5 after closing, resisting loosening caused by vibration and airflow impact. The sealing state is consistently stable, and the unlocking and locking operations are simple, requiring no special tools. The observation channel can be quickly opened during routine inspections and maintenance, offering high operational convenience. The flange ring 6 at the top of the base body 1 and the fireproof damper 7 are connected and locked using circumferentially distributed bolt assemblies, ensuring a strong and detachable connection. This meets the equipment's load-bearing and airtightness requirements while facilitating the disassembly, inspection, replacement, and maintenance of the fireproof damper 7. The overall opening, closing, locking, and docking structure is compact, with smooth linkage between components. Without altering the original equipment installation method, it improves the observation and sealing functions, further enhancing practicality and ease of maintenance.

[0050] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A fan base with an observation hole, comprising a base body (1) and an annular seat (2), characterized in that: The annular seat (2) is sleeved on the outside of the base body (1). The upper end of the base body (1) is provided with an upper thickening plate (11), and the lower end of the base body (1) is provided with a lower thickening plate (12). The annular seat (2) is located between the upper thickening plate (11) and the lower thickening plate (12). The lower end face of the upper thickening plate (11) is provided with an upper T-shaped groove (13), and the upper end face of the lower thickening plate (12) is provided with a lower T-shaped groove (14). The side wall of the base body (1) is provided with... Three sets of through holes (15), the upper end of the annular seat (2) is provided with an upper protrusion (21), the upper protrusion (21) is embedded in the upper T-shaped slide groove (13) and is slidably connected with the upper T-shaped slide groove (13), the lower end of the annular seat (2) is provided with a lower protrusion (22), the lower protrusion (22) is embedded in the lower T-shaped slide groove (14) and is slidably connected with the lower T-shaped slide groove (14), a steel pipe (4) is provided on the annular seat (2), and a blind plate (5) is installed at one end of the steel pipe (4).

2. A fan base with an observation hole according to claim 1, characterized in that: The base body (1) is located at the bottom of the fireproof air damper (7), and the fireproof air damper (7) is located at the bottom of the fan (8).

3. A fan base with an observation hole according to claim 1, characterized in that: An elbow plate (3) is welded and fixed on the inner wall of the base body (1). Eight sets of elbow plates (3) are provided, and the eight sets of elbow plates (3) are evenly distributed along the circumference of the base body (1).

4. A fan base with an observation hole according to claim 1, characterized in that: The three sets of through holes (15) are evenly distributed along the circumference of the base body (1), and the inner diameter of the steel pipe (4) is larger than the diameter of the through holes (15).

5. A fan base with an observation hole according to claim 1, characterized in that: The inner side of the annular seat (2) is provided with a rubber liner (23), which is bonded and fixed to the annular seat (2) and is tightly fitted to the outer wall of the base body (1).

6. A fan base with an observation hole according to claim 1, characterized in that: A first connecting seat (41) is provided on one side of the steel pipe (4), and a second connecting seat (42) is provided on the other side of the steel pipe (4). A rotating shaft is installed on the first connecting seat (41), and the rotating shaft is rotatably connected to the first connecting seat (41). A connecting sleeve (43) is fixedly sleeved on the rotating shaft. The connecting sleeve (43) is fixedly connected to a screw (44). A locking nut (45) is threaded on the screw (44).

7. A fan base with an observation hole according to claim 6, characterized in that: One end of the blind plate (5) is provided with a connecting arm (51), and the other end of the blind plate (5) is provided with a connecting plate (52), and a slot (53) is provided on the connecting plate (52).

8. A fan base with an observation hole according to claim 7, characterized in that: The connecting arm (51) of the blind plate (5) is hinged to the second connecting seat (42) of the steel pipe (4).

9. A fan base with an observation hole according to claim 8, characterized in that: A sealing liner (54) is provided on the inner side of the blind plate (5), and the sealing liner (54) is bonded and fixedly connected to the blind plate (5).

10. A fan base with an observation hole according to claim 2, characterized in that: The base body (1) is provided with a flange ring (6) at its top end. The upper end face of the flange ring (6) is in contact with the lower end face of the fireproof air damper (7). The fireproof air damper (7) and the flange ring (6) are locked together by a circumferentially distributed bolt assembly.

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