Building ventilating duct

Abstract

The utility model relates to the technical field of building construction, in particular to a building ventilating pipeline, which is characterized in that air flowing through a ventilating pipe is heated by the aid of a heating component, a heating rod is started to heat water in a heating cavity during ventilation in winter or ventilation at low environment temperature, a coiled pipe is simultaneously heated, and the water in the heating cavity is heated by the coiled pipe. Therefore, the air in the coiled pipe is heated; a filter screen is arranged and used for filtering dust and impurities in external air, so that the dust and the impurities in the external air are prevented from entering the building through the filter screen, and the dust and the impurities are also prevented from blocking other assemblies in the ventilation pipe; the building ventilation device is reasonable in structural design and convenient to use, outside dust or impurities are prevented from entering a building through the ventilation pipeline while building ventilation is met, air passing through the ventilation pipeline can be heated, and the situation that the temperature in the building is reduced due to ventilation in winter is avoided.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, specifically to a building ventilation duct. Background Technology

[0002] Ventilation inside buildings is essential. Generally, building ventilation can be achieved by opening the windows. However, for some special buildings, such as windowless underground garages, underground warehouses, storage rooms, or workshops with high ceilings, ventilation ducts need to be installed near the roof for ventilation. In the current technology, ventilation ducts are buried in the building walls, and ventilation fans are installed inside the ventilation ducts. The rotation of the ventilation fans allows outside air to enter the building to achieve ventilation.

[0003] Existing ventilation ducts easily bring external dust or impurities into the building. Furthermore, these ducts have poor insulation capabilities. In winter, when the temperature of natural wind is very low, the entry of cold air into the building through the ventilation ducts will lower the internal temperature and reduce the building's comfort. To maintain a comfortable temperature, buildings use heating or air conditioning systems. The decrease in internal temperature caused by ventilation will result in energy waste for these heating or air conditioning systems. Utility Model Content

[0004] The purpose of this utility model is to provide a building ventilation duct that, while satisfying the building's ventilation needs, prevents external dust or impurities from entering the building through the ventilation duct, and can heat the air passing through the ventilation duct to avoid the building's internal temperature dropping due to ventilation in winter.

[0005] To achieve the aforementioned technical effects, this utility model provides a building ventilation duct comprising a ventilation pipe embedded inside the building wall, penetrating the building wall and extending out of the building wall at both ends; a heating assembly and a fan assembly are connected inside the ventilation pipe, with the fan assembly positioned in front of the heating assembly. The fan assembly includes a mounting base, a motor I, and a fan blade assembly. The mounting base is fixedly connected inside the ventilation pipe, the motor I is fixedly connected inside the mounting base, and the fan blade assembly is fixedly connected to the output shaft of the motor I, which is coaxial with the ventilation pipe; the heating assembly includes a heating chamber, a serpentine tube, an air-gathering hood, and... The heating rod and heating chamber are fixedly connected inside the ventilation duct. The heating chamber and ventilation duct are coaxial. The heating chamber is a closed cavity containing water. There are multiple heating rods, all of which are connected inside the heating chamber. A serpentine tube is located inside the heating chamber and is set along the length of the heating chamber. The front end of the serpentine tube passes through the front side plate of the heating chamber, and the rear end of the serpentine tube passes through the rear side plate of the heating chamber. A gas-concentrating hood is fixedly connected to the front end of the serpentine tube that extends out of the front side plate of the heating chamber. The gas-concentrating hood is coaxial with the ventilation duct and is a trumpet-shaped tube. The inner diameter of the end of the gas-concentrating hood connected to the serpentine tube is smaller than the inner diameter of the end of the gas-concentrating hood not connected to the serpentine tube. The gas-concentrating hood is located behind motor I.

[0006] Furthermore, the fixed base includes an outer ring, support rods, and a center plate. The outer wall of the outer ring is fixedly connected to the inner wall of the ventilation pipe. Multiple support rods are provided, and all support rods are fixedly connected to the inner wall of the outer ring. The multiple support rods are evenly distributed around the outer ring axis. The center plate is coaxial with the outer ring and is fixedly connected to the end of the multiple support rods that is not connected to the outer ring. The motor I is fixedly connected to the center plate by bolts. The center plate has holes for the bolts to pass through.

[0007] Furthermore, the fan blade assembly includes a central sleeve, a screw hole I, and fan blades. Multiple fan blades are provided, and all fan blades are fixedly connected to the outer wall of the central sleeve. The multiple fan blades are evenly distributed around the central sleeve axis. The screw hole I is located at the center of the central sleeve and penetrates through the central sleeve. A screw rod I is fixedly connected to the output shaft of the motor I. The screw hole I is connected to the screw rod I, and a nut is connected to the screw rod I. The nut is abutted against the end of the central sleeve away from the motor I.

[0008] Furthermore, a filter screen is fixedly connected inside the ventilation duct, and the filter screen is located in front of the fan assembly along the direction from the inside of the building to the outside of the building.

[0009] Furthermore, the heating assembly includes a diffuser hood, which is coaxial with the ventilation pipe. The diffuser hood is fixedly connected to the rear end of the serpentine tube extending from the rear side plate of the heating cavity. The diffuser hood is a horn tube, and the inner diameter of the end of the diffuser hood connected to the serpentine tube is smaller than the inner diameter of the end of the diffuser hood not connected to the serpentine tube.

[0010] Furthermore, the ventilation duct is equipped with an inner shielding plate and a screw rod inside. The inner shielding plate is connected to the end of the expansion hood that is not connected to the serpentine tube. The outer diameter of the inner shielding plate is larger than the inner diameter of the end of the expansion hood that is not connected to the serpentine tube. A connecting seat is fixedly connected to the upper end of the inner shielding plate. The connecting seat is provided with a through hole I. The axis of the through hole I is perpendicular to the axis of the expansion hood. The screw rod is located above the expansion hood. Both ends of the screw rod are fixedly connected to the inner wall of the ventilation duct. The through hole I is connected to the screw rod. Two nuts are connected to the screw rod. The connecting seat is located between the two nuts.

[0011] Furthermore, the ventilation duct is internally connected to a pushing assembly, which includes a housing, a mounting plate, a motor II, a push rod, a guide rod, and a guide block. The housing is fixedly connected to the inside of the ventilation duct, and the mounting plate is fixedly connected to the inside of the housing. The motor II is fixedly connected to the mounting plate by bolts. The mounting plate has a through hole III in its center, through which the output shaft of the motor II passes. A screw II is fixedly connected to the output shaft of the motor II. The push rod has a screw hole II in its center, which is connected to the screw II. One end of the guide rod is fixedly connected to the side wall of the mounting plate away from the motor II, and the other end of the guide rod is fixedly connected to the side plate of the housing away from the motor II. The guide block is fixedly connected to the outer wall of the push rod. The guide block has a through hole IV, which is slidably connected to the guide rod. The side plate of the outer casing away from the motor II has a through hole II. The end of the push rod away from the motor II extends out of the through hole II. The end of the push rod extending out of the through hole II is fixedly connected to an outer shielding plate. The outer shielding plate is connected to the end of the ventilation duct that extends outside the building. The outer wall of the outer shielding plate is larger than the inner diameter of the ventilation duct. There are multiple guide blocks, which are evenly distributed around the axis of the push rod. There are multiple guide rods, which are evenly distributed around the axis of the push rod. The through holes IV of the multiple guide blocks are slidably connected to the multiple guide rods.

[0012] Furthermore, the aforementioned pushing components are provided in multiples, and the multiple pushing components are evenly distributed around the ventilation pipe axis, with the push rods of the multiple pushing components all fixedly connected to the outer shielding plate.

[0013] Furthermore, the heating assembly includes a temperature sensor, which is fixedly connected inside the heating cavity.

[0014] Furthermore, the propulsion component includes a rain sensor, which is fixedly connected to the end of the ventilation duct that extends outside the building, and the rain sensor is fixedly connected to the top of the ventilation duct.

[0015] The beneficial effects of this utility model are as follows: This utility model achieves heating of the air flowing through the ventilation duct through the heating component. During winter ventilation or ventilation in low ambient temperatures, the heating rod is activated, heating the water inside the heating chamber and simultaneously heating the serpentine tube, thus heating the air inside the serpentine tube. The serpentine tube design increases the airflow distance, thereby improving the air heating effect. Air heated through the serpentine tube enters the building without causing a drop in the building's internal temperature. This utility model also incorporates a filter screen to filter dust and impurities from the outside air, thereby preventing... Dust and impurities in the outside air enter the building through the filter screen, preventing them from clogging other components inside the ventilation duct. The use of an inner shielding plate restricts one-way ventilation from the ventilation hood into the building. The push component and outer shielding plate are primarily used to shield the ventilation duct during severe weather conditions such as rain, snow, and strong winds. This invention features a reasonable structural design, is easy to use, and while meeting building ventilation requirements, prevents external dust or impurities from entering the building through the ventilation duct. It also heats the air passing through the ventilation duct, preventing a drop in building interior temperature caused by ventilation in winter. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a partial structural schematic diagram of the heating assembly of this utility model;

[0018] Figure 3 This utility model Figure 2 AA section view;

[0019] Figure 4 This is a schematic diagram of the fan assembly of this utility model;

[0020] Figure 5 This utility model Figure 4 BB cross-sectional view;

[0021] Figure 6 This is a schematic diagram of the structure of the driving component of this utility model;

[0022] Figure 7 This is a schematic diagram of the push rod of the present invention after it has been extended.

[0023] In the diagram: 1. Ventilation duct; 2. Heating assembly; 3. Inner shielding plate; 4. Fan assembly; 5. Filter screen; 6. Push assembly; 7. Outer shielding plate; 8. Rain sensor; 9. Heating cavity; 10. Serpentine tube; 11. Gas concentrator; 12. Gas diffuser; 13. Heating rod; 14. Temperature sensor; 15. Connecting seat; 1501. Through hole I; 16. Screw; 17. Fixing seat; 1701. Outer ring; 1702. Support 1703. Rod; 18. Center plate; 19. Motor I; 10. Screw I; 11. Fan blade assembly; 1901. Center sleeve; 1902. Screw hole I; 1903. Fan blade; 20. Housing; 2001. Through hole II; 21. Mounting plate; 22. Through hole III; 23. Push rod; 24. Guide rod; 25. Guide block; 26. Through hole IV. Detailed Implementation

[0024] like Figures 1-7 As shown, this utility model discloses a building ventilation duct, including a ventilation pipe 1, which is embedded inside the building wall and penetrates the building wall, with both ends of the ventilation pipe 1 extending out of the building wall. Along the direction from the interior of the building to the exterior, a heating assembly 2 and a fan assembly 4 are connected inside the ventilation pipe 1. The fan assembly 4 is located in front of the heating assembly 2 and includes a fixing base 17, a motor I 18, and a fan blade assembly 19. The fixing base 17 is fixedly connected inside the ventilation pipe 1, the motor I 18 is fixedly connected inside the fixing base 17, and the fan blade assembly 19 is fixedly connected to the output shaft of the motor I 18. The motor I 18 is coaxial with the ventilation pipe 1. The heating assembly 2 includes a heating chamber 9, a serpentine tube 10, an air-gathering hood 11, and a heating rod 13. The heating chamber 9 is fixedly connected inside the ventilation pipe 1, and the heating chamber 9 is coaxial with the ventilation pipe 1. The heating chamber 9 is a closed cavity containing water. Multiple heating rods 13 are connected inside the heating chamber 9. A serpentine tube 10 is located inside the heating chamber 9, extending along its length. The front end of the serpentine tube 10 penetrates the front side plate of the heating chamber 9, and the rear end penetrates the rear side plate. A gas-concentrating hood 11 is fixedly connected to the front end of the serpentine tube 10, which extends beyond the front side plate of the heating chamber 9. The gas-concentrating hood 11 is coaxial with the ventilation duct 1 and is a horn-shaped tube. The inner diameter of the end of the gas-concentrating hood 11 connected to the serpentine tube 10 is smaller than the inner diameter of the end of the gas-concentrating hood 11 not connected to the serpentine tube 10. The gas-concentrating hood 11 is located behind the motor I 18. A filter screen 5 is fixedly connected inside the ventilation duct 1, extending from the interior of the building to the exterior. The filter screen 5 is located in front of the fan assembly 4.

[0025] The filter 5 is designed to filter dust and impurities in the outside air, thereby preventing dust and impurities from entering the building through the filter 5 and also preventing dust and impurities from clogging other components inside the ventilation duct 1.

[0026] The rotation of motor I18 drives the fan blade assembly 19 to rotate. The rotation of the fan blade assembly 19 brings outside air into the ventilation duct 1. After passing through the filter screen 5 and the fan assembly 4, the air enters the air-gathering hood 11. The air in the air-gathering hood 11 enters the serpentine tube 10. When ventilating in winter or when the ambient temperature is low, the heating rod 13 is activated. The heating rod 13 heats the water inside the heating chamber 9, and at the same time, the serpentine tube 10 is heated, thus heating the air inside the serpentine tube 10. The serpentine tube 10 increases the air flow distance, thereby improving the air heating effect. The air heated by the serpentine tube 10 enters the building without causing a drop in the building's internal temperature.

[0027] The fixed base 17 includes an outer ring 1701, support rods 1702, and a center plate 1703. The outer wall of the outer ring 1701 is fixedly connected to the inner wall of the ventilation duct 1. Multiple support rods 1702 are provided, and each support rod 1702 is fixedly connected to the inner wall of the outer ring 1701. The multiple support rods 1702 are evenly distributed around the axis of the outer ring 1701. The center plate 1703 is coaxial with the outer ring 1701 and is fixedly connected to the end of the multiple support rods 1702 that is not connected to the outer ring 1701. The motor I 18 is fixedly connected to the center plate 1703 by bolts. The center plate 1703 has holes for the bolts to pass through.

[0028] The fixed base 17 is used to support the motor I 18. In this embodiment, three support rods 1702 are provided. Considering the ventilation effect, it is not advisable to provide too many support rods 1702. It is generally recommended that the number of support rods 1702 be two to four, so as to prevent the support rods 1702 from blocking the flow of air. The selection of motor I 18 should be able to allow air to pass through the heating component 2 and smoothly enter the interior of the building.

[0029] The fan blade assembly 19 includes a central sleeve 1901, a screw hole I 1902, and fan blades 1903. Multiple fan blades 1903 are provided, and all fan blades 1903 are fixedly connected to the outer wall of the central sleeve 1901. The multiple fan blades 1903 are evenly distributed around the axis of the central sleeve 1901. The screw hole I 1902 is located at the center of the central sleeve 1901 and penetrates through the central sleeve 1901. A screw rod I 1801 is fixedly connected to the output shaft of the motor I 18. The screw hole I 1902 is connected to the screw rod I 1801. A nut is connected to the screw rod I 1801, and the nut is abutted against the end of the central sleeve 1901 away from the motor I 18.

[0030] The fan blade 1903 should be designed to allow air to flow from the outside of the building to the inside. If the fan blade 1903 is designed incorrectly, this invention will not function properly. The nut locks the center sleeve 1901 to prevent the fan blade assembly 19 from accidentally falling off as the screw I 1801 rotates. To ensure stability, two nuts are connected to the screw I 1801 in this embodiment.

[0031] The heating assembly 2 includes a venting hood 12, which is coaxial with the ventilation pipe 1. The venting hood 12 is fixedly connected to the rear end of the serpentine tube 10 that extends out of the rear side plate of the heating cavity 9. The venting hood 12 is a horn tube, and the inner diameter of the end of the venting hood 12 connected to the serpentine tube 10 is smaller than the inner diameter of the end of the venting hood 12 not connected to the serpentine tube 10.

[0032] The diffuser 12 diffuses the air output from the serpentine tube 10.

[0033] The ventilation duct 1 is equipped with an inner shielding plate 3 and a screw 16. The inner shielding plate 3 is connected to the end of the expansion hood 12 that is not connected to the serpentine tube 10. The outer diameter of the inner shielding plate 3 is larger than the inner diameter of the end of the expansion hood 12 that is not connected to the serpentine tube 10. A connecting seat 15 is fixedly connected to the upper end of the inner shielding plate 3. The connecting seat 15 is provided with a through hole I 1501. The axis of the through hole I 1501 is perpendicular to the axis of the expansion hood 12. The screw 16 is located above the expansion hood 12. Both ends of the screw 16 are fixedly connected to the inner wall of the ventilation duct 1. The through hole I 1501 is connected to the screw 16. Two nuts are connected to the screw 16. The connecting seat 15 is located between the two nuts.

[0034] The inner shielding plate 3 serves to restrict the one-way ventilation of the expansion hood 12 into the building. When the heating component of this invention is not heating and the fan component is not rotating, air inside the building may enter the expansion hood 12 and flow out of the building. The air inside the building will press the inner shielding plate 3 against the expansion hood 12, thus shielding the expansion hood 12 and ensuring that air inside the building cannot enter the expansion hood 12. When this invention is working normally, the external air flowing out of the expansion hood 12 pushes the inner shielding plate 3 open, thus ensuring smooth ventilation. The two nuts on the screw 16 mainly serve to limit the position of the connecting seat 15. Only the approximate position needs to be determined, and no tightening is required. It is recommended to use lightweight plastic as the material for the inner shielding plate 3.

[0035] A pushing assembly 6 is connected inside the ventilation duct 1. The pushing assembly 6 includes a housing 20, a mounting plate 21, a motor II 22, a push rod 23, a guide rod 24, and a guide block 25. The housing 20 is fixedly connected to the inside of the ventilation duct 1, and the mounting plate 21 is fixedly connected to the inside of the housing 20. The motor II 22 is fixedly connected to the mounting plate 21 by bolts. The mounting plate 21 has a through hole III 2101 in its center, through which the output shaft of the motor II 22 passes. A screw II 2201 is fixedly connected to the output shaft of the motor II 22. The push rod 23 has a screw hole II 2301 in its center, which is connected to the screw II 2201. One end of the guide rod 24 is fixedly connected to the side wall of the mounting plate 21 away from the motor II 22, and the other end of the guide rod 24 is fixedly connected to the side plate of the housing 20 away from the motor II 22. Guide block 25 is fixedly connected to the outer wall of push rod 23. Guide block 25 is provided with through hole IV 2501. Through hole IV 2501 is slidably connected to guide rod 24. The side plate of outer shell 20 away from motor II 22 is provided with through hole II 2001. One end of push rod 23 away from motor II 22 extends out of through hole II 2001. One end of push rod 23 extending out of through hole II 2001 is fixedly connected to outer shielding plate 7. Outer shielding plate 7 is connected to the end of ventilation pipe 1 that extends outside the building. The outer wall of outer shielding plate 7 is larger than the inner diameter of ventilation pipe 1. There are multiple guide blocks 25. Multiple guide blocks 25 are evenly distributed around the axis of push rod 23. There are multiple guide rods 24. Multiple guide rods 24 are evenly distributed around the axis of push rod 23. The through holes IV 2501 of multiple guide blocks 25 are slidably connected to multiple guide rods 24 one by one.

[0036] Multiple push components 6 are provided, and the multiple push components 6 are evenly distributed around the axis of the ventilation pipe 1. The push rods 23 of the multiple push components 6 are all fixedly connected to the outer shielding plate 7.

[0037] The main purpose of the push assembly 6 and the outer shield 7 is to shield the ventilation duct 1 during severe weather such as rain, snow and strong winds. The motor II 22 drives the screw II 2201 to rotate. Since the guide rod 24 and the guide block 25 restrict the rotation of the push rod 23, when the screw II 2201 rotates, it will drive the push rod 23 to extend or retract. The extension or retraction of the push rod 23 will drive the outer shield 7 to move, thereby realizing the opening or shielding of the ventilation duct 1.

[0038] Multiple guide rods 24 and multiple guide blocks 25 improve the stability of the extension and retraction of the push rod 23 and prevent a single guide rod 24 from breaking due to excessive load and imbalance.

[0039] The arrangement of multiple propulsion components 6 improves the stability of the outer shield 7 during movement and also prevents strong winds from blowing the outer shield 7 away. It is recommended that the outer shield 7 be made of lightweight plastic.

[0040] The heating assembly 2 includes a temperature sensor 14, which is fixedly connected inside the heating cavity 9.

[0041] The temperature sensor 14 is used to detect the temperature of the water inside the heating chamber 9, thereby controlling the operation of the heating rod 13.

[0042] The drive assembly 6 includes a rain sensor 8, which is fixedly connected to the end of the ventilation duct 1 that extends outside the building, and the top of the ventilation duct 1.

[0043] The rain sensor 8 is used to control the operation of motor II 22. When the rain sensor 8 detects rain, it controls motor II 22 to drive push rod 23 to retract the outer shield 7 via a signal.

Claims

1. A building vent duct, characterised in that: The utility model provides a kind of heating ventilation pipe, including ventilation pipe (1), ventilation pipe (1) is embedded in building wall inside, ventilation pipe (1) penetrates building wall, ventilation pipe (1) both ends are projected building wall;Along the direction of inside to outside of building, heating component (2) and fan component (4) are connected in ventilation pipe (1) inside, fan component (4) is located in front of heating component (2), fan component (4) includes fixed seat (17), motor I (18) and fan blade component (19), fixed seat (17) is fixedly connected in ventilation pipe (1) inside, motor I (18) is fixedly connected in fixed seat (17), fan blade component (19) is fixedly connected on the output shaft of motor I (18), motor I (18) is coaxial with ventilation pipe (1);Heating component (2) includes heating cavity (9), serpentine pipe (10), gas-collecting cover (11) and heating rod (13), heating cavity (9) is fixedly connected in ventilation pipe (1) inside, heating cavity (9) is coaxial with ventilation pipe (1), heating cavity (9) is enclosed cavity, heating cavity (9) is loaded with water, heating rod (13) is provided with multiple, multiple heating rod (13) are connected in heating cavity (9) inside, serpentine pipe (10) is located in heating cavity (9) inside, serpentine pipe (10) is arranged along the length direction of heating cavity (9), serpentine pipe (10) front end pipe penetrates the front side plate of heating cavity (9), serpentine pipe (10) rear end pipe penetrates the rear side plate of heating cavity (9), gas-collecting cover (11) is fixedly connected on the serpentine pipe (10) front end pipe of heating cavity (9) front side plate that projects, gas-collecting cover (11) is coaxial with ventilation pipe (1), gas-collecting cover (11) is horn pipe, the inner diameter of gas-collecting cover (11) connected one end of serpentine pipe (10) is less than the inner diameter of gas-collecting cover (11) not connected one end of serpentine pipe (10), gas-collecting cover (11) is located in motor I (18) rear side.

2. A building vent duct according to claim 1, wherein: The fixed seat (17) includes an outer ring (1701), a plurality of support rods (1702), and a center plate (1703). The outer wall of the outer ring (1701) is fixedly connected to the inner wall of the ventilation pipe (1). The plurality of support rods (1702) are fixedly connected to the inner wall of the outer ring (1701). The plurality of support rods (1702) are evenly distributed around the axis of the outer ring (1701). The center plate (1703) is coaxial with the outer ring (1701). The center plate (1703) is fixedly connected to one end of the plurality of support rods (1702) that is not connected to the outer ring (1701). The motor I (18) is fixedly connected to the center plate (1703) by bolts. The center plate (1703) has holes for the bolts to pass through.

3. A building vent duct according to claim 2, wherein: The fan assembly (19) comprises a center sleeve (1901), a screw hole I (1902) and a plurality of fan blades (1903), the fan blades (1903) are fixedly connected to the outer wall of the center sleeve (1901), the plurality of fan blades (1903) are evenly distributed around the axis of the center sleeve (1901), the screw hole I (1902) is arranged at the center of the center sleeve (1901) and penetrates the center sleeve (1901), the output shaft of the motor I (18) is fixedly connected with a screw rod I (1801), the screw hole I (1902) is connected to the screw rod I (1801), and the screw rod I (1801) is connected with a nut, and the nut is in abutment against one end of the center sleeve (1901) away from the motor I (18).

4. A building vent duct according to any one of claims 1 to 3, wherein: The filter screen (5) is fixedly connected in the ventilation pipe (1), and is arranged in front of the fan assembly (4) in the direction from the inside of the building to the outside of the building.

5. A building vent duct according to claim 4, wherein: The heating assembly (2) comprises a gas diffuser (12), the gas diffuser (12) is coaxial with the ventilation pipe (1), the gas diffuser (12) is fixedly connected to the rear end of the serpentine pipe (10) extending from the rear side plate of the heating cavity (9), the gas diffuser (12) is a horn pipe, and the inner diameter of one end of the gas diffuser (12) connected with the serpentine pipe (10) is smaller than the inner diameter of the other end of the gas diffuser (12) not connected with the serpentine pipe (10).

6. A building vent duct according to claim 5, wherein: The ventilation pipe (1) is internally provided with an inner shielding plate (3) and a screw rod (16), the inner shielding plate (3) is connected to one end of the gas diffuser (12) not connected with the serpentine pipe (10), the outer diameter of the inner shielding plate (3) is greater than the inner diameter of the one end of the gas diffuser (12) not connected with the serpentine pipe (10), the upper end of the inner shielding plate (3) is fixedly connected with a connecting seat (15), the connecting seat (15) is provided with a through hole I (1501), the axis of the through hole I (1501) is perpendicular to the axis of the gas diffuser (12), the screw rod (16) is arranged above the gas diffuser (12), the two ends of the screw rod (16) are fixedly connected to the inner wall of the ventilation pipe (1), the through hole I (1501) is connected to the screw rod (16), and two nuts are connected to the screw rod (16), and the connecting seat (15) is arranged between the two nuts.

7. A building vent duct according to any one of claims 1, 2, 3, 5 or 6, characterised in that: The ventilation pipe (1) is internally connected with a pushing assembly (6), the pushing assembly (6) comprises a shell (20), a mounting plate (21), a motor II (22), a push rod (23), a guide rod (24) and a guide block (25), the shell (20) is fixedly connected on the inside of the ventilation pipe (1), the mounting plate (21) is fixedly connected on the inside of the shell (20), the motor II (22) is fixedly connected on the mounting plate (21) through bolts, the mounting plate (21) is provided with a through hole III (2101) in the center, the output shaft of the motor II (22) penetrates through the through hole III (2101), the output shaft of the motor II (22) is fixedly connected with a screw rod II (2201), the push rod (23) is provided with a screw hole II (2301) in the center, the screw hole II (2301) is connected on the screw rod II (2201), one end of the guide rod (24) is fixedly connected on the side wall of the mounting plate (21) away from the motor II (22), the other end of the guide rod (24) is fixedly connected on the side plate of the shell (20) away from the motor II (22), the guide block (25) is fixedly connected on the outer wall of the push rod (23), the guide block (25) is provided with a through hole IV (2501) thereon, the through hole IV (2501) is slidingly connected on the guide rod (24), the side plate of the shell (20) away from the motor II (22) is provided with a through hole II (2001), one end of the push rod (23) away from the motor II (22) extends out of the through hole II (2001), one end of the push rod (23) extending out of the through hole II (2001) is fixedly connected with an outer shielding plate (7), the outer shielding plate (7) is connected on the end of the ventilation pipe (1) extending out of the building, the outer wall of the outer shielding plate (7) is larger than the inner diameter of the ventilation pipe (1); the guide block (25) is provided with a plurality of guide blocks (25) which are evenly distributed around the axis of the push rod (23), the guide rod (24) is provided with a plurality of guide rods (24) which are evenly distributed around the axis of the push rod (23), the through hole IV (2501) of the plurality of guide blocks (25) is slidingly connected on the plurality of guide rods (24) one by one.

8. A building vent duct according to claim 7, wherein: The pushing assembly (6) is provided with a plurality of pushing assemblies (6) which are evenly distributed around the axis of the ventilation pipe (1), the push rod (23) of the plurality of pushing assemblies (6) is fixedly connected on the outer shielding plate (7).

9. A building vent duct according to claim 1, wherein: The heating assembly (2) comprises a temperature sensor (14), and the temperature sensor (14) is fixedly connected in the heating cavity (9).

10. A building vent duct according to claim 7, wherein: The pushing assembly (6) comprises a rain sensor (8), the rain sensor (8) is fixedly connected on the end of the ventilation pipe (1) extending out of the building, and the rain sensor (8) is fixedly connected on the top end of the ventilation pipe (1).

Images