Ventilation structure for annular building

Abstract

The utility model relates to the technical field of ventilation structures, in particular to a ventilation structure for an annular building, which comprises a semispherical building, and an air inlet pipe and a ventilation pipe mounted at the upper ends of the two sides of the semispherical building, an exhaust fan is mounted in the ventilation pipe, an air inlet fan is mounted in the air inlet pipe, and one end of the ventilation pipe away from the semispherical building is communicated with a protective pipe. The end, away from the hemispherical building, of the air inlet pipe is fixedly connected with a rain blocking pipe, the end, away from the ventilation pipe, of the protection pipe is provided with an opening facing downwards, the rain blocking pipe is trapezoidal, the small-area end of the rain blocking pipe communicates with the air inlet pipe, and the large-area end of the rain blocking pipe extends out in the direction away from the air inlet pipe. The ventilation pipe is arranged in the hemispherical building, the protection pipe can prevent rainwater from entering the ventilation pipe, the exhaust fan in the ventilation pipe can exhaust gas in the hemispherical building, the rain blocking pipe cannot affect gas circulation, the circulation speed of gas passing through the rain blocking pipe can be increased, and therefore the ventilation effect of the air inlet fan can be improved through the rain blocking pipe.

Description

Technical Field

[0001] This application relates to the technical field of ventilation structures, and in particular to a ventilation structure for circular buildings. Background Art

[0002] Circular buildings, namely hemispherical buildings, are often built in some public areas such as parks, commercial streets, and shopping malls. The ventilation structure for circular buildings, that is, the ventilation structure for hemispherical buildings, is used for ventilating and replacing the air in the hemispherical buildings.

[0003] In the prior art, for the ventilation of hemispherical buildings, the commonly used method is to open ventilation openings at the upper ends on both sides of the hemispherical building, so that air flows naturally into the building through the ventilation openings for air replacement. However, when it rains, the setting of the ventilation openings will cause rainwater to flow into the building through the ventilation openings, resulting in water leakage in the building. In the prior art, to solve this technical problem, ventilation pipes and intake pipes are usually installed at the ventilation openings at the upper ends on both sides of the hemispherical building respectively. An exhaust fan is installed in the ventilation pipe, and an intake fan is installed in the intake pipe. By starting the exhaust fan, the gas in the hemispherical building is discharged, and by starting the intake fan, the external gas is inhaled into the hemispherical building to keep the air in the hemispherical building clean. This can not only prevent rainwater from entering the hemispherical building, but also improve the ventilation efficiency of the hemispherical building.

[0004] However, when it rains, the rainwater is not necessarily vertically downward. Sometimes, due to the wind, the rainwater tilts and flows into the ventilation pipe or the intake pipe, resulting in the accumulation of rainwater in the ventilation pipe or the intake pipe. It is easy for bacteria to breed in the ventilation pipe or the intake pipe, and when the rainwater accumulates to a certain extent, it will also flow from the ventilation pipe or the intake pipe into the hemispherical building. Content of the Utility Model

[0005] Aiming at the deficiencies of the prior art, the purpose of this application is to provide a ventilation structure for circular buildings to solve the technical problem that rainwater is likely to accumulate in the ventilation pipe and the intake pipe in the prior art.

[0006] The above purpose of this application is achieved through the following technical solutions: A ventilation structure for circular buildings includes a hemispherical building, an intake pipe and a ventilation pipe installed at the upper ends on both sides of the hemispherical building. An exhaust fan is installed in the ventilation pipe, and an intake fan is installed in the intake pipe. One end of the ventilation pipe far from the hemispherical building is communicated with a protection pipe. One end of the intake pipe far from the hemispherical building is fixedly connected with a rain shield pipe. The end of the protection pipe far from the ventilation pipe is provided with an opening and the opening faces downward. The rain shield pipe is trapezoidal, the end with a smaller area is communicated with the intake pipe, and the end with a larger area extends away from the intake pipe. A through opening is provided at the end of the rain shield pipe with a larger area.

[0007] By adopting the above technical solution, the protective pipe is set to be connected to the ventilation pipe at one end and have an opening facing downwards at the other end, which can not only prevent rainwater from entering the ventilation pipe, but also enable the exhaust fan in the ventilation pipe to discharge the gas inside the hemispherical building. The rain shield pipe is set to be trapezoidal, with its smaller area end connected to the intake pipe and its larger area end extending away from the intake pipe. When rainwater falls obliquely into the intake pipe, the inner side of the rain shield pipe is an inclined surface, so that the rainwater falls on the inclined surface of the rain shield pipe and flows out of the rain shield pipe along the inner side of the rain shield pipe. In this way, it can prevent rainwater from accumulating in the intake pipe. When the intake fan transports external gas into the hemispherical building, the rain shield pipe will not only not affect the gas flow, but also accelerate the gas flow velocity passing through the rain shield pipe. According to the venturi effect, when the air flow flows from a wide place to a narrow place, the flow velocity will increase, so that the rain shield pipe can improve the ventilation effect of the intake fan.

[0008] Furthermore, the protective pipe is inclinedly arranged on the ventilation pipe, and its lowest point faces the ground.

[0009] By adopting the above technical solution, although the setting of the protective pipe can prevent rainwater from accumulating in the ventilation pipe, when the exhaust fan discharges gas, because the opening of the protective rod faces downwards, it will cause the gas to flow back to the exhaust fan after hitting the side wall of the protective pipe, reducing the ventilation efficiency of the exhaust fan. The inclinedly arranged protective pipe solves this technical problem. The side wall of the inclinedly arranged protective pipe is an inclined surface. When the gas hits the inclined surface, it will continue to flow along the inclined surface and thus flow out through the protective pipe, improving the ventilation efficiency of the ventilation pipe.

[0010] Furthermore, a necking part is provided at the connection between the protective pipe and the ventilation pipe. One end of the necking part is connected to the ventilation pipe, and the other end is connected to the protective pipe. The pipe diameter of the necking part gradually decreases from the ventilation pipe towards the protective pipe, and the pipe diameter of the protective pipe is smaller than that of the ventilation pipe.

[0011] By adopting the above technical solution, although the inclinedly arranged protective pipe can improve the exhaust rate of the ventilation pipe, when the gas discharged by the exhaust fan hits the inclined surface of the protective pipe, part of the gas will still flow back to the exhaust fan, reducing the ventilation efficiency of the exhaust fan. The necking part and setting the pipe diameter of the protective pipe to be smaller than that of the ventilation pipe solve this technical problem. Through the setting of the necking part, the gas flow velocity into the protective pipe becomes faster, and because the pipe diameter of the protective pipe is smaller than that of the ventilation pipe, the gas flowing into the protective pipe will flow even faster. In this way, after the gas hits the inclined surface of the protective pipe, the rebounding distance will be longer. The longer distance will cause the gas to hit another inclined surface of the protective pipe again, so that the gas will not flow back to the exhaust fan but will flow out along the protective pipe, thereby further improving the ventilation efficiency of the ventilation pipe.

[0012] Furthermore, a protection component for preventing rainwater from entering the intake pipe is provided inside the end of the intake pipe far away from the hemispherical building.

[0013] Furthermore, the protection component includes a lower inclined baffle fixedly connected to the inner bottom surface of the intake pipe and an upper inclined baffle fixedly connected to the inner top surface of the intake pipe. The lower inclined baffle and the upper inclined baffle are arranged oppositely, and there is a gap between the lower inclined baffle and the upper inclined baffle. The upper inclined baffle is inclined and arranged inside the intake pipe, with its highest point fixedly connected to the top surface of the intake pipe and its lowest point extending towards the lower inclined baffle. The lower inclined baffle is inclined and arranged inside the intake pipe, with its lowest point fixedly connected to the bottom surface of the intake pipe and its highest point extending towards the upper inclined baffle.

[0014] By adopting the above technical solution, although the rain shield pipe can prevent most of the rainwater from entering the intake pipe, when the rainwater is blown by the wind and just falls into the intake pipe from the middle of the rain shield pipe, the airflow accelerated by the rain shield pipe may carry the rainwater towards the intake fan, which causes the rainwater to flow into the hemispherical building through the intake fan. The setting of the protection component solves this technical problem. By blocking the intake pipe with the lower inclined baffle and the upper inclined baffle, when the rainwater is blown by the wind and just falls into the intake pipe from the middle of the rain shield pipe, it will be blocked by the lower inclined baffle and the upper inclined baffle and flow along the lower inclined baffle and the upper inclined baffle to the rain shield pipe, and then flow out through the rain shield pipe. Moreover, the gap between the lower inclined baffle and the upper inclined baffle can accelerate the airflow when passing through, thereby improving the ventilation effect of the intake pipe.

[0015] Furthermore, a blocking device for blocking the intake pipe and the ventilation pipe is provided at one end of the intake pipe and the ventilation pipe extending into the hemispherical building.

[0016] Furthermore, the blocking device includes a rotating shaft respectively rotatably connected to the upper end inside one end of the intake pipe and the ventilation pipe extending into the hemispherical building, and a blocking plate fixedly connected to the rotating shaft for blocking the intake pipe and the ventilation pipe. A driving motor is fixedly installed on one side of the upper ends of the intake pipe and the ventilation pipe, and the output end of the driving motor is fixedly connected to the rotating shaft.

[0017] By adopting the above technical solution, although the intake pipe and the ventilation pipe improve the ventilation efficiency of the hemispherical building, the hemispherical building is applied to places such as parks, commercial streets, and shopping malls, and air conditioners must be installed inside. When pedestrians rest inside the hemispherical building in summer, there will be more pedestrians inside the hemispherical building. If the air conditioner is turned on at this time, a part of the cold air will flow out through the intake pipe and the ventilation pipe, resulting in the interior of the hemispherical building being relatively stuffy. The setting of the blocking device solves this technical problem. By starting the driving motor to rotate the rotating shaft, the blocking plate blocks the intake pipe and the ventilation pipe, so that the cold air inside the hemispherical building will not flow out through the intake pipe and the ventilation pipe, enabling the air conditioner inside the hemispherical building to quickly reduce the temperature inside the hemispherical building.

[0018] Further, an inclined portion is provided at one end of the blocking plate away from the rotating shaft.

[0019] By adopting the above technical solution, the inclined portion prevents the end of the blocking plate away from the rotating shaft from being stuck when the blocking plate blocks the intake pipe and the ventilation pipe.

[0020] In summary, the present application includes at least one of the following beneficial technical effects:

[0021] Through the setting of the rain shielding pipe and the protection pipe, it is realized that the protection pipe can not only prevent rainwater from entering the ventilation pipe, but also enable the exhaust fan in the ventilation pipe to discharge the gas inside the hemispherical building. The rain shielding pipe is set as a trapezoid, with its smaller area end connected to the intake pipe and its larger area end extending away from the intake pipe. When rainwater falls obliquely into the intake pipe, the inner side of the rain shielding pipe is an inclined surface, so that the rainwater falls on the inclined surface of the rain shielding pipe and flows out of the rain shielding pipe along the inner side of the rain shielding pipe. This can prevent rainwater from accumulating in the intake pipe. When the intake fan transports external gas into the hemispherical building, the rain shielding pipe will not only not affect the gas flow, but also accelerate the gas flow speed passing through the rain shielding pipe. According to the Venturi effect, when the air flow flows from a wide place to a narrow place, the flow rate will increase, so as to achieve the purpose of improving the ventilation effect of the intake fan by the rain shielding pipe.

[0022] Through the setting of the protection pipe and the necking portion, it is realized that the side wall of the inclined protection pipe is an inclined surface. When the gas impacts on the inclined surface, it will continue to flow along the inclined surface and thus flow out through the protection pipe, improving the ventilation efficiency of the ventilation pipe. The setting of the necking portion makes the gas flow faster into the protection pipe, and because the diameter of the protection pipe is smaller than that of the ventilation pipe, the gas flowing into the protection pipe will flow even faster. In this way, after the gas impacts the inclined surface of the protection pipe, the rebounding distance will be longer, and the longer distance will cause the gas to impact another inclined surface of the protection pipe again, so that the gas will not flow back to the drainage fan but will flow out along the protection pipe, thus further improving the ventilation efficiency of the ventilation pipe.

[0023] Through the setting of the protection component, when the rain is blown by the wind and just drops into the intake pipe from the middle of the rain shield pipe, it will be blocked by the lower inclined baffle and the upper inclined baffle, and flow along the lower inclined baffle and the upper inclined baffle to the rain shield pipe, and then flow out through the rain shield pipe. Moreover, the interval between the lower inclined baffle and the upper inclined baffle can accelerate the airflow when passing through, so as to achieve the purpose of improving the ventilation effect of the intake pipe. Brief Description of the Drawings

[0024] Figure 1 is a schematic diagram of the overall structure of the embodiment;

[0025] Figure 2 is along Figure 1 the sectional view taken along line A-A in

[0026] Figure 3 is another view of the overall structure of the embodiment;

[0027] Figure 4 is Figure 3 the enlarged view of part A in

[0028] Reference Signs: 1, hemispherical building; 10, intake pipe; 11, ventilation pipe; 12, exhaust fan; 13, intake fan; 2, protection pipe; 20, necking part; 3, rain shield pipe; 4, protection component; 40, lower inclined baffle; 41, upper inclined baffle; 5, blocking device; 50, rotating shaft; 51, blocking plate; 52, driving motor; 53, inclined part. Detailed Description of the Embodiment

[0029] The following further describes the present application in detail with reference to the drawings.

[0030] Embodiment, referring to Figure 1 、 Figure 2, A ventilation structure for a circular building, comprising a hemispherical building 1, an air inlet pipe 10 and a ventilation pipe 11 installed at the upper ends on both sides of the hemispherical building 1. An exhaust fan 12 is installed in the ventilation pipe 11, and an intake fan 13 is installed in the air inlet pipe 10. One end of the ventilation pipe 11 away from the hemispherical building 1 is communicated with a protective pipe 2, and one end of the air inlet pipe 10 away from the hemispherical building 1 is fixedly connected with a rain shield pipe 3. The end of the protective pipe 2 away from the ventilation pipe 11 is provided with an opening facing downward. The rain shield pipe 3 is trapezoidal, with the end having a smaller area communicating with the air inlet pipe 10 and the end having a larger area extending away from the air inlet pipe 10. A through hole is provided at the end of the rain shield pipe 3 with a larger area. Setting the protective pipe 2 to be communicated with the ventilation pipe 11 at one end and having an opening facing downward at the other end can enable the protective pipe 2 to prevent rainwater from entering the ventilation pipe 11 and also enable the exhaust fan 12 in the ventilation pipe 11 to discharge the gas inside the hemispherical building 1. Setting the rain shield pipe 3 to be trapezoidal, with the end having a smaller area communicating with the air inlet pipe 10 and the end having a larger area extending away from the air inlet pipe 10, when rainwater falls obliquely into the air inlet pipe 10, the inner side of the rain shield pipe 3 is an inclined surface, so that the rainwater falls on the inclined surface of the rain shield pipe 3 and flows out of the rain shield pipe 3 along the inner side of the rain shield pipe 3. In this way, it can prevent rainwater from accumulating in the air inlet pipe 10. And when the intake fan 13 transports external gas into the hemispherical building 1, the rain shield pipe 3 will not only not affect the gas flow, but also can make the gas flow rate through the rain shield pipe 3 faster. According to the venturi effect, when the air flow flows from a wide place to a narrow place, the flow rate will become faster, so that the rain shield pipe 3 can improve the ventilation effect of the intake fan 13.

[0031] Although the setting of the protective pipe 2 can prevent rainwater from accumulating in the ventilation pipe 11, when the exhaust fan 12 discharges gas, because the opening of the protective rod faces downward, the gas will hit the side wall of the protective pipe 2 and then flow back to the exhaust fan 12, reducing the ventilation efficiency of the exhaust fan 12. To solve this technical problem, in this embodiment, the protective pipe 2 is inclinedly arranged on the ventilation pipe 11, and its lowest point faces the ground. The side wall of the inclinedly arranged protective pipe 2 is an inclined surface. When the gas hits the inclined surface, it will continue to flow along the inclined surface and thus flow out through the protective pipe 2, improving the ventilation efficiency of the ventilation pipe 11.

[0032] Although the inclined protective pipe 2 can increase the exhaust rate of the ventilation pipe 11, some of the gas will still flow back to the drainage fan when it hits the inclined surface of the protective pipe 2 after being discharged by the drainage fan, reducing the ventilation efficiency of the drainage fan. To solve this technical problem, in this embodiment, a necking portion 20 is provided at the connection between the protective pipe 2 and the ventilation pipe 11. One end of the necking portion 20 is connected to the ventilation pipe 11, and the other end is connected to the protective pipe 2. The diameter of the necking portion 20 gradually decreases from the ventilation pipe 11 to the protective pipe 2 direction, and the diameter of the protective pipe 2 is smaller than that of the ventilation pipe 11. The setting of the necking portion 20 makes the gas flow faster into the protective pipe 2, and because the diameter of the protective pipe 2 is smaller than that of the ventilation pipe 11, the gas flowing into the protective pipe 2 will flow even faster. In this way, after the gas hits the inclined surface of the protective pipe 2, the rebounding distance will be longer, and the longer distance will cause the gas to hit another inclined surface of the protective pipe 2 again, so that the gas will not flow back to the drainage fan but will flow out along the protective pipe 2, thereby further improving the ventilation efficiency of the ventilation pipe 11.

[0033] Although the rain shield pipe 3 can prevent most of the rainwater from entering the intake pipe 10, when the rainwater is blown exactly from the middle of the rain shield pipe 3 and drops into the intake pipe 10, the airflow accelerated by the rain shield pipe 3 may carry the rainwater towards the intake fan 13, which causes the rainwater to flow into the hemispherical building 1 through the intake fan 13. To solve this technical problem, in this embodiment, a protective component 4 for preventing rainwater from entering the intake pipe 10 is provided inside the end of the intake pipe 10 far from the hemispherical building 1. The protective component 4 includes a lower inclined baffle 40 fixedly connected to the inner bottom surface of the intake pipe 10 and an upper inclined baffle 41 fixedly connected to the inner top surface of the intake pipe 10. The lower inclined baffle 40 and the upper inclined baffle 41 are arranged opposite to each other with a gap therebetween. The upper inclined baffle 41 is inclinedly arranged in the intake pipe 10, with its highest point fixedly connected to the top surface of the intake pipe 10 and its lowest point extending towards the lower inclined baffle 40. The lower inclined baffle 40 is inclinedly arranged in the intake pipe 10, with its lowest point fixedly connected to the bottom surface of the intake pipe 10 and its highest point extending towards the upper inclined baffle 41. By blocking the intake pipe 10 with the lower inclined baffle 40 and the upper inclined baffle 41, when the rainwater is blown exactly from the middle of the rain shield pipe 3 and drops into the intake pipe 10, it will be blocked by the lower inclined baffle 40 and the upper inclined baffle 41 and flow along the lower inclined baffle 40 and the upper inclined baffle 41 to the rain shield pipe 3 and then flow out through the rain shield pipe 3. Moreover, the gap between the lower inclined baffle 40 and the upper inclined baffle 41 can accelerate the airflow when it passes through, thereby improving the ventilation effect of the intake pipe 10.

[0034] Although the intake pipe 10 and the ventilation pipe 11 improve the ventilation efficiency of the hemispherical building 1, the hemispherical building 1 is applied to places such as parks, commercial streets, and shopping malls, and air conditioners must be installed inside it. When pedestrians rest inside the hemispherical building 1 in summer, there will be more pedestrians inside the hemispherical building 1. If the air conditioner is turned on at this time, a part of the cold air will flow out through the intake pipe 10 and the ventilation pipe 11, resulting in a relatively stuffy environment inside the hemispherical building 1. To solve this technical problem, referring to Figure 3 , Figure 4 , in this embodiment, at one end of the intake pipe 10 and the ventilation pipe 11 extending into the hemispherical building 1, a blocking device 5 for blocking the intake pipe 10 and the ventilation pipe 11 is provided. The blocking device 5 includes a rotating shaft 50 rotatably connected to the upper inner part of one end of the intake pipe 10 and the ventilation pipe 11 extending into the hemispherical building 1 respectively, and a blocking plate 51 fixedly connected to the rotating shaft 50 for blocking the intake pipe 10 and the ventilation pipe 11. On one side of the upper ends of the intake pipe 10 and the ventilation pipe 11, a driving motor 52 is fixedly installed. The output end of the driving motor 52 is fixedly connected to the rotating shaft 50. By starting the driving motor 52, the rotating shaft 50 rotates, so that the blocking plate 51 blocks the intake pipe 10 and the ventilation pipe 11. In this way, the cold air inside the hemispherical building 1 will not flow out through the intake pipe 10 and the ventilation pipe 11, enabling the air conditioner inside the hemispherical building 1 to quickly reduce the temperature inside the hemispherical building 1. And an inclined portion 53 is provided at one end of the blocking plate 51 away from the rotating shaft 50. The inclined portion 53 prevents the end of the blocking plate 51 away from the rotating shaft 50 from being stuck when the blocking plate 51 blocks the intake pipe 10 and the ventilation pipe 11.

[0035] Specific implementation process: When ventilation is required, start the exhaust fan 12 and the intake fan 13. The intake fan 13 sucks the external air into the hemispherical building 1. The air flow passes through the rain shield pipe 3, the protection component 4 and the intake fan 13 and flows into the hemispherical building 1. The exhaust fan 12 discharges the air inside the hemispherical building 1. The air flow passes through the exhaust fan 12, the necking portion 20 and the protection pipe 2 and flows out, so that the air inside the hemispherical building 1 remains fresh and clean.

[0036] When it is hot outside and the air conditioner needs to be turned on inside the hemispherical building 1, start the driving motor 52 to rotate the rotating shaft 50. The rotating shaft 50 drives the blocking plate 51 to block the intake pipe 10 and the ventilation pipe 11 to prevent the cold air from flowing out.

[0037] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of the application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A ventilation structure for an annular building, comprising a hemispherical building (1) and an air intake pipe (10) and a ventilation pipe (11) installed at the upper ends of both sides of the hemispherical building (1), wherein an exhaust fan (12) is installed in the ventilation pipe (11), and an air intake fan (13) is installed in the air intake pipe (10), characterized in that: The end of the ventilation pipe (11) away from the hemispherical building (1) is connected to a protective pipe (2); the end of the air intake pipe (10) away from the hemispherical building (1) is fixedly connected to a rain shield pipe (3); the end of the protective pipe (2) away from the ventilation pipe (11) is provided with an opening and the opening faces downward; the rain shield pipe (3) is trapezoidal, the end with a smaller area is connected to the air intake pipe (10), and the end with a larger area extends in a direction away from the air intake pipe (10); the end of the rain shield pipe (3) with a larger area is provided with a through opening.

2. A ventilation structure for annular buildings according to claim 1, characterized in that: The protection pipe (2) is arranged obliquely on the ventilation pipe (11), with its lowest point facing the ground.

3. The annular building ventilation structure according to claim 1, characterized in that: A necking portion (20) is provided at the place where the protection tube (2) is connected to the ventilation tube (11); one end of the necking portion (20) is connected to the ventilation tube (11), and the other end is connected to the protection tube (2); the diameter of the necking portion (20) gradually decreases from the ventilation tube (11) to the protection tube (2); the diameter of the protection tube (2) is smaller than that of the ventilation tube (11).

4. The annular building ventilation structure according to claim 1, characterized in that: A protective component (4) for preventing rainwater from entering the air intake pipe (10) is provided inside one end of the air intake pipe (10) away from the hemispherical building (1).

5. A ventilation structure for annular buildings according to claim 4, characterized in that: The protection component (4) comprises a downwardly inclined baffle (40) fixedly connected to the bottom surface of the air intake pipe (10) and an upwardly inclined baffle (41) fixedly connected to the top surface of the air intake pipe (10). The downwardly inclined baffle (40) and the upwardly inclined baffle (41) are arranged opposite to each other, and a gap is left between the downwardly inclined baffle (40) and the upwardly inclined baffle (41). The upwardly inclined baffle (41) is arranged obliquely in the air intake pipe (10), and its highest point is fixedly connected to the top surface of the air intake pipe (10), and its lowest point extends toward the downwardly inclined baffle (40). The downwardly inclined baffle (40) is arranged obliquely in the air intake pipe (10), and its lowest point is fixedly connected to the bottom surface of the air intake pipe (10), and its highest point extends toward the upwardly inclined baffle (41).

6. The annular building ventilation structure according to claim 1, characterized in that: The ends of the air intake pipe (10) and the ventilation pipe (11) extending into the hemispherical building (1) are both provided with a blocking device (5) for blocking the air intake pipe (10) and the ventilation pipe (11).

7. A ventilation structure for annular buildings according to claim 6, characterized in that: The blocking device (5) comprises a rotating shaft (50) rotatably connected to the upper end of the air inlet pipe (10) and the ventilation pipe (11) extending into the hemispherical building (1), and a blocking plate (51) fixedly connected to the rotating shaft (50); a driving motor (52) is fixedly mounted on one side of the upper end of the air inlet pipe (10) and the ventilation pipe (11); and an output end of the driving motor (52) is fixedly connected to the rotating shaft (50).

8. A ventilation structure for annular buildings according to claim 7, characterized in that: An inclined portion (53) is provided at one end of the blocking plate (51) away from the rotating shaft (50).

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