Building ventilation device

Abstract

The invention relates to the technical field of building ventilation, in particular to a building ventilation device which comprises a box body, the box body is rectangular, a rectangular cavity is formed in the rear end of the box body, a box cover is detachably and fixedly installed at the rear end of the box body in a sealed mode, the rear end of an outdoor communication pipe is coaxially and fixedly connected into a round hole, and a first partition plate is fixedly connected to the middle of the outdoor communication pipe; the middle of the rectangular cavity is fixedly connected with a second partition plate, and the front end of the second partition plate clings to and is aligned with the rear end of the first partition plate. A fresh air outlet and an exhaust air inlet are formed in the upper end and the lower end of the box body correspondingly, an air suction assembly and an exhaust assembly are arranged at the upper end and the lower end of the rectangular cavity of the box body correspondingly, and the air suction assembly and the fresh air outlet are arranged correspondingly. The overturning type port cover assembly can completely block the front port of the outdoor communicating pipe in a closed state; according to the building ventilation device, the installation difficulty and cost can be reduced.

Description

Technical Field

[0001] This invention relates to the field of building ventilation technology, and more particularly to a building ventilation and air exchange device. Background Technology

[0002] Building ventilation is divided into natural ventilation and mechanical ventilation. Natural ventilation refers to the direct or purified exhaust of polluted indoor air to the outside, followed by the replenishment of fresh air, thereby maintaining the indoor air environment in accordance with hygiene standards.

[0003] However, in existing building ventilation systems, the fresh air intake pipe and exhaust pipe that connect to the outside are directly connected to the outside for a long time. When ventilation is not needed, it is impossible to prevent outdoor air from entering the room. At the same time, the fresh air intake pipe and exhaust pipe that connect to the outside in existing building ventilation systems are two independently arranged pipes. When installing them on the building wall, two holes need to be opened for the fresh air intake pipe and the exhaust pipe respectively, which undoubtedly increases the installation difficulty and cost. Summary of the Invention

[0004] The purpose of this invention is to provide a building ventilation and air exchange device to solve the technical problems existing in the background art.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: A building ventilation and air exchange device includes: a box body, a box cover, an outdoor connecting pipe, a first partition, and a second partition. The box body is rectangular with a rectangular cavity at its rear end. The box cover is detachably and sealed at the rear end of the box body. A circular hole is formed in the middle of the front end of the box body. The rear end of the outdoor connecting pipe is coaxially and fixedly connected to the circular hole. The first partition is fixedly connected to the middle of the outdoor connecting pipe, dividing the outdoor connecting pipe into upper and lower chambers. The second partition is fixedly connected to the middle of the rectangular cavity, dividing the rectangular cavity into upper and lower chambers. The front end of the second partition... The end is tightly attached to and aligned with the rear end of the partition; the upper and lower ends of the box are respectively provided with a fresh air outlet and an exhaust air inlet; the upper and lower ends of the rectangular cavity of the box are respectively provided with an air extraction component and an exhaust component, the air extraction component is correspondingly provided with the fresh air outlet, and the exhaust component is correspondingly provided with the exhaust air inlet; the front end of the partition is provided with a flip-type port cover component that can be opened or closed, the flip-type port cover component can completely block the front port of the outdoor connecting pipe when closed; the flip-type port cover component can allow indoor and outdoor air exchange when open.

[0006] Furthermore, the flip-type port cover assembly includes: a rotating seat, a rotating shaft, a flip cover plate, a gear, a rack, and an electric telescopic rod. The front end of the outdoor connecting pipe has an annular recessed groove. The front end of the first partition plate is flush with the rear end of the annular recessed groove. Two rotating seats are symmetrically arranged on the left and right sides of the front center of the first partition plate. Two rotating shafts, two flip cover plates, and two gears are each provided. The two flip cover plates are rotatably mounted on the upper and lower sides of the two rotating seats via two rotating shafts. A gear is coaxially fixedly connected to the center of the rotating shaft, and the gear is located between the two rotating seats. A rectangular groove is formed in the center of the front end of the first partition plate. The rack is slidably connected within the rectangular groove, and the upper and lower ends of the rack mesh with two gears respectively. The rear end of the rack is fixedly connected to the telescopic end of the electric telescopic rod, and the fixed end of the electric telescopic rod is fixedly connected to the rear end of the rectangular groove. The flip cover plate is semi-circular, and the two flip cover plates can be combined to form a circular cover plate that matches the annular recessed groove.

[0007] Furthermore, it also includes: a sealing flange, on which the outdoor connecting pipe is fitted with a sealing flange, the rear end face of the sealing flange pressing against the front end face of the housing, and the sealing flange is made of rubber.

[0008] Furthermore, the exhaust assembly includes: a support, a motor bracket, a motor, and a fan blade. The support is fixedly installed at the bottom of the rectangular cavity. A vent hole is provided on the support, which runs vertically through the cavity. The vent hole is coaxially connected to the exhaust inlet. The motor is fixedly installed on the lower side of the inner wall of the vent hole via the motor bracket. A fan blade is fixedly installed at the top output end of the motor.

[0009] Furthermore, the air extraction assembly includes: a second support, a second motor bracket, a second motor, and a second fan blade. The second support is fixedly installed at the top of the rectangular cavity. The second support has a second through-hole that runs vertically through it. The second through-hole is coaxially connected to the fresh air outlet. The second motor is fixedly installed on the lower side of the inner wall of the second through-hole via the second motor bracket. The second fan blade is fixedly installed at the top output end of the second motor.

[0010] Furthermore, it also includes: π-shaped brackets, lower filter layer one, upper filter layer one, filter layer two, and filter layer three. The lower filter layer one, upper filter layer one, filter layer two, and filter layer three each have a rectangular frame. Two π-shaped brackets are symmetrically and fixedly connected to the left and right sides of the rectangular cavity below the rear port of the outdoor connecting pipe. The lower filter layer one is slidably inserted and fixed in the two π-shaped brackets. Six π-shaped brackets are symmetrically and fixedly connected from bottom to top to the left and right sides of the rectangular cavity above the rear port of the outdoor connecting pipe. The upper filter layer one, filter layer two, and filter layer three are slidably inserted into the six π-shaped brackets from bottom to top.

[0011] Furthermore, both the lower filter layer and the upper filter layer are stainless steel filter screens, the second filter layer is an activated carbon filter layer, and the third filter layer is a HEPA filter screen.

[0012] Furthermore, an exhaust air inlet pipe is fixedly connected to the bottom of the housing, and the exhaust air inlet pipe is coaxially connected to the exhaust air inlet. A fresh air outlet pipe is fixedly connected to the top of the housing. The fresh air outlet pipe is a right-angle bend. The lower end of the fresh air outlet pipe is coaxially connected to the fresh air outlet. A ball head is ball-jointed inside the rear end of the fresh air outlet pipe. An axial through hole is opened inside the ball head. An air outlet pipe is fixedly connected to the outer end of the ball head. The air outlet pipe is coaxially connected to the axial through hole.

[0013] Furthermore, it also includes a sealing gasket, which is pressed tightly between the box body and the box cover.

[0014] Furthermore, four ear plates are symmetrically arranged at the four corners of the box body facing the outdoor connecting pipe, and connection holes are opened on the ear plates.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention divides the outdoor connecting pipe into two chambers by setting a partition, wherein the upper chamber serves as the fresh air intake channel and the lower chamber serves as the exhaust air outlet channel; compared with the independently arranged fresh air intake pipe and exhaust air outlet pipe in the prior art, only one hole needs to be opened during installation, thereby reducing the installation difficulty and cost.

[0016] 2. The present invention, through the provided flip-type port cover assembly, enables indoor and outdoor air exchange when open; and completely seals the front port of the outdoor connecting pipe when closed; thus preventing outdoor air from entering the room when air exchange is not required. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a longitudinal sectional view of the present invention; Figure 3 This is a transverse longitudinal sectional view of the present invention at the rotation axis; Figure 4 This is a transverse longitudinal sectional view of the present invention; Figure 5 This is a rear bottom view of the present invention.

[0018] The labels in the attached diagram are as follows: 1-Box body, 101-Rectangular cavity, 102-Exhaust air inlet, 103-Fresh air outlet, 2-Box cover, 3-Outdoor connecting pipe, 301-Annular embedded groove, 4-Partition plate one, 401-Rectangular groove, 5-Partition plate two, 6-Rotating seat, 7-Rotating shaft, 8-Flip cover plate, 9-Gear, 10-Rack, 11-Electric telescopic rod, 12-Sealing flange, 13-Support one, 1301-Ventilation hole one 14-Motor bracket one, 15-Motor one, 16-Fan blade one, 17-Support two, 1701-Ventilation hole two, 18-Motor bracket two, 19-Motor two, 20-Fan blade two, 21-π-shaped bracket, 22-Lower filter layer one, 23-Upper filter layer one, 24-Filter layer two, 25-Filter layer three, 26-Exhaust air inlet pipe, 27-Fresh air outlet pipe, 28-Ball head, 29-Exhaust pipe, 30-Sealing gasket, 31-Ear plate. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0020] See Figures 1-5 As shown, a building ventilation and air exchange device includes: a box body 1, a box cover 2, an outdoor connecting pipe 3, a first partition 4, and a second partition 5. The box body 1 is rectangular with a rectangular cavity 101 at the rear end. The box cover 2 is detachably and sealed to the rear end of the box body 1. A circular hole is opened in the middle of the front end of the box body 1, and the rear end of the outdoor connecting pipe 3 is coaxially fixedly connected to the circular hole. The first partition 4 is fixedly connected to the middle of the outdoor connecting pipe 3, dividing the outdoor connecting pipe 3 into upper and lower chambers. The second partition 5 is fixedly connected to the middle of the rectangular cavity 101, dividing the rectangular cavity 101 into upper and lower chambers. The front end of the second partition 5 is close to and aligned with the rear end of the first partition 4. Both the first partition 4 and the second partition 5 are made of heat-conducting materials, thereby enabling heat exchange between the indoor exhaust air and the outdoor intake air to a certain extent. In winter... The relatively warm indoor air conducts heat to the cold outdoor air drawn in through partition 4 and partition 5, preheating the cold air. In summer, the relatively cool indoor air conducts heat with the hot outdoor air drawn in through partition 4 and partition 5, precooling the hot air. The upper and lower ends of the housing 1 are respectively provided with a fresh air outlet 103 and an exhaust air inlet 102. The upper and lower ends of the rectangular cavity 101 of the housing 1 are respectively provided with an air extraction component and an exhaust component. The air extraction component is corresponding to the fresh air outlet 103, and the exhaust component is corresponding to the exhaust air inlet 102. The front end of partition 4 is provided with a flip-type port cover component that can be opened or closed. When closed, the flip-type port cover component can completely block the front port of the outdoor connecting pipe 3. When open, the flip-type port cover component can facilitate indoor and outdoor air exchange.

[0021] In this embodiment, the flip-type port cover assembly includes: a rotating seat 6, a rotating shaft 7, a flip cover plate 8, a gear 9, a rack 10, and an electric telescopic rod 11. An annular groove 301 is provided at the front end of the outdoor connecting pipe 3. The front end of the partition 4 is flush with the rear end of the annular groove 301. Two rotating seats 6 are symmetrically arranged on the left and right sides of the front center of the partition 4. Two rotating shafts 7, two flip cover plates 8, and two gears 9 are provided. The two flip cover plates 8 are rotatably mounted on the upper and lower sides of the two rotating seats 6 via the two rotating shafts 7. A gear 9 is coaxially fixedly connected to the middle of the rotating shaft 7, and the gear 9 is located between the two rotating seats 6. A rectangular groove 401 is provided at the middle of the front end of the partition 4. The rack 10 is slidably connected within the rectangular groove 401. The upper and lower ends of the rack 10 mesh with the two gears 9 respectively. The telescopic end of the electric telescopic rod 11 is fixedly connected to the rear end of the rack 10. The fixed end of 1 is fixedly connected to the rear end of the rectangular groove 401; the flip cover 8 is semi-circular, and the two flip covers 8 can be combined to form a circular cover that matches the annular inner groove 301; when it is necessary to open the two flip covers 8, the user only needs to control the electric telescopic rod 11 to retract through the controller. At this time, the rack 10 slides backward along the rectangular groove and drives the two gears 9 to rotate in opposite directions, thereby driving the two flip covers 8 to flip outward at a certain angle through the two rotating shafts 7 respectively. The maximum outward flip angle of the two flip covers 8 is 90°; the flip angle of the two flip covers 8 can be adjusted according to actual needs. If rapid ventilation is required, the user can flip the two flip covers 8 to the maximum outward flip angle; if slow ventilation is required (such as when sleeping at night), the flip angle of the two flip covers 8 can be adjusted according to actual needs. , .

[0022] In this embodiment, the building ventilation device further includes a sealing flange 12. The sealing flange 12 is fitted on the outdoor connecting pipe 3. The rear end face of the sealing flange 12 presses against the front end face of the housing 1. The sealing flange 12 is made of rubber. Since the outdoor connecting pipe 3 is installed in the opening of the building wall, and since the diameter of the opening is generally slightly larger than the outer diameter of the outdoor connecting pipe 3, there is a gap between the outer wall of the outdoor connecting pipe 3 and the inner wall of the opening after the outdoor connecting pipe 3 is installed. The sealing flange 12 is used to seal this gap to prevent outdoor air from entering the room through this gap.

[0023] In this embodiment, the exhaust assembly includes: a support 13, a motor bracket 14, a motor 15, and a fan blade 16. The support 13 is fixedly installed at the bottom of the rectangular cavity 101. A vent hole 1301 is provided on the support 13, which runs vertically through the cavity. The vent hole 1301 is coaxially connected to the exhaust air inlet 102. The motor 15 is fixedly installed on the lower side of the inner wall of the vent hole 1301 through the motor bracket 14. The fan blade 16 is fixedly installed at the top output end of the motor 15.

[0024] In this embodiment, the air extraction assembly includes: a second support 17, a second motor bracket 18, a second motor 19, and a second fan blade 20. The second support 17 is fixedly installed at the top of the rectangular cavity 101. The second support 17 has a through-hole 1701. The through-hole 1701 is coaxially connected to the fresh air outlet 103. The second motor 19 is fixedly installed on the lower side of the inner wall of the through-hole 1701 through the second motor bracket 18. The second fan blade 20 is fixedly installed at the top output end of the second motor 19.

[0025] In this embodiment, the building ventilation and air exchange device further includes: π-shaped brackets 21, lower filter layer 1 22, upper filter layer 1 23, filter layer 24, and filter layer 3 25. The lower filter layer 1 22, upper filter layer 1 23, filter layer 24, and filter layer 3 25 each have a rectangular frame. Two π-shaped brackets 21 are symmetrically fixedly connected to the left and right sides of the rectangular cavity 101 below the rear port of the outdoor connecting pipe 3. The lower filter layer 1 22 is slidably inserted and fixed in the two π-shaped brackets 21. Six π-shaped brackets 21 are symmetrically fixedly connected from bottom to top to the left and right sides of the rectangular cavity 101 above the rear port of the outdoor connecting pipe 3. The upper filter layer 1 23, filter layer 24, and filter layer 3 25 are slidably inserted into the six π-shaped brackets 21 from bottom to top.

[0026] The lower filter layer 22 and the upper filter layer 23 are both stainless steel filters, which can filter larger particles in outdoor air, such as large dust particles, willow catkins, poplar catkins, lint, or insects; the second filter layer 24 is an activated carbon filter layer, which can adsorb and filter harmful gases in outdoor air, such as sulfides; the third filter layer 25 is a HEPA filter, which can filter smaller particles in outdoor air, such as PM2.5 and PM10.

[0027] In this embodiment, an exhaust air inlet pipe 26 is fixedly connected to the bottom of the housing 1, and the exhaust air inlet pipe 26 is coaxially connected to the exhaust air inlet 102; a fresh air outlet pipe 27 is fixedly connected to the top of the housing 1, the fresh air outlet pipe 27 is a right-angle bend, the lower end of the fresh air outlet pipe 27 is coaxially connected to the fresh air outlet 103, a ball head 28 is ball-hinged inside the rear end of the fresh air outlet pipe 27, an axial through hole is opened inside the ball head 28, and an air outlet pipe 29 is fixedly connected to the outer end of the ball head 28, the air outlet pipe 29 is coaxially connected to the axial through hole.

[0028] In this embodiment, the building ventilation device further includes a sealing gasket 30, which is pressed between the box body 1 and the box cover 2, and the sealing gasket 30 can ensure the airtightness between the box body 1 and the box cover 2.

[0029] In this embodiment, four ear plates 31 are symmetrically arranged at the four corners of the box 1 facing the outdoor connecting pipe 3. The ear plates 31 are provided with connection holes. The entire box 1 is fixed to the building wall by passing through the connection holes with wall nails. A single-chip microcomputer controller is also fixedly installed on the outer left side of the box 1. The single-chip microcomputer controller can control the operation of all electrical components in the entire device.

[0030] Working principle: When indoor-outdoor ventilation is needed, the user simply controls the electric telescopic rod 11 to retract via the controller. At this time, the rack 10 slides backward along the rectangular groove, simultaneously driving the two gears 9 to rotate in opposite directions. This, in turn, drives the two rotating shafts 7 to respectively rotate the two flip-up covers 8 outward at a certain angle. The maximum outward rotation angle of the two flip-up covers 8 is 90°. The rotation angle of the two flip-up covers 8 can be adjusted according to actual needs. If rapid ventilation is required, the user can rotate the two flip-up covers 8 to the maximum outward rotation angle; if slow ventilation is required (e.g., when sleeping at night), the rotation angle of the two flip-up covers 8 can be adjusted according to actual needs. , Next, the controller controls motor 15 and motor 29 to work respectively. Motor 15 drives fan blade 16 to rotate, drawing indoor stale air from exhaust air intake pipe 26 through exhaust air intake port 102 and vent 1301 into the lower part of rectangular cavity 101 and out through the lower cavity of external connecting pipe 3. Motor 219 drives fan blade 20 to rotate, drawing fresh outdoor air from the upper cavity of external connecting pipe 3 into the upper part of rectangular cavity 101, and then through upper filter layer 123, filter layer 24 and filter layer 325 into vent 2701. Then, it passes through fresh air outlet 103, fresh air outlet pipe 27 and ball head 28 and is finally drawn into the room through air outlet pipe 29.

[0031] In the description of this invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "top / bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0032] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent substitutions, and improvements made by those skilled in the art to the above embodiments without departing from the scope of the technical solution of the present invention, based on the technical essence of the present invention, shall still fall within the protection scope of the technical solution of the present invention.

Claims

1. A building ventilation and air exchange device, characterized in that, include: The enclosure consists of a box body (1), a box cover (2), an outdoor connecting pipe (3), a first partition (4), and a second partition (5). The box body (1) is rectangular and has a rectangular cavity (101) at the rear end. The box cover (2) is detachably and sealed at the rear end of the box body (1). A round hole is opened in the middle of the front end of the box body (1). The rear end of the outdoor connecting pipe (3) is coaxially and fixedly connected to the round hole. A first partition (4) is fixedly connected in the middle of the outdoor connecting pipe (3), dividing the outdoor connecting pipe (3) into upper and lower chambers through the first partition (4). A second partition (5) is fixedly connected in the middle of the rectangular cavity (101), dividing the rectangular cavity (101) into upper and lower chambers through the second partition (5). The front end of the second (5) is close to and aligned with the rear end of the first partition (4); the upper and lower ends of the box (1) are respectively provided with a fresh air outlet (103) and an exhaust air inlet (102); the upper and lower ends of the rectangular cavity (101) of the box (1) are respectively provided with an air extraction component and an exhaust component; the air extraction component is correspondingly provided with the fresh air outlet (103), and the exhaust component is correspondingly provided with the exhaust air inlet (102); the front end of the first partition (4) is provided with a flip-type port cover component that can be opened or closed; the flip-type port cover component can completely block the front port of the outdoor connecting pipe (3) when closed; the flip-type port cover component can perform indoor and outdoor air exchange when open.

2. The building ventilation and air exchange device according to claim 1, characterized in that: The flip-type port cover assembly includes: a rotating seat (6), a rotating shaft (7), a flip cover plate (8), a gear (9), a rack (10), and an electric telescopic rod (11). The front end of the outdoor connecting pipe (3) is provided with an annular embedded groove (301). The front end of the partition plate (4) is flush with the rear end of the annular embedded groove (301). Two rotating seats (6) are symmetrically arranged on the left and right sides of the front middle of the partition plate (4). Two rotating shafts (7), two flip cover plates (8), and two gears (9) are provided. The two flip cover plates (8) are respectively rotatably installed on the upper and lower sides of the two rotating seats (6) through the two rotating shafts (7). A gear (9) is coaxially fixedly connected in the middle. The gear (9) is located between two rotating seats (6). A rectangular groove (401) is opened in the middle of the front end of the partition (4). The rack (10) is slidably connected in the rectangular groove (401). The upper and lower ends of the rack (10) respectively mesh with two gears (9). The rear end of the rack (10) is fixedly connected to the telescopic end of the electric telescopic rod (11). The fixed end of the electric telescopic rod (11) is fixedly connected to the rear end of the rectangular groove (401). The flip cover (8) is semi-circular. The two flip covers (8) can be combined to form a circular cover that matches the annular inner groove (301).

3. A building ventilation and air exchange device according to claim 1, characterized in that: Also includes: A sealing flange (12) is fitted on the outdoor connecting pipe (3). The rear end face of the sealing flange (12) presses against the front end face of the box body (1). The sealing flange (12) is made of rubber.

4. A building ventilation and air exchange device according to claim 1, characterized in that: The exhaust assembly includes: a support (13), a motor bracket (14), a motor (15), and a fan blade (16). The support (13) is fixedly installed at the bottom of a rectangular cavity (101). A ventilation hole (1301) is provided on the support (13) that runs vertically through it. The ventilation hole (1301) is coaxially connected to the exhaust air inlet (102). The motor (15) is fixedly installed on the lower side of the inner wall of the ventilation hole (1301) through the motor bracket (14). The fan blade (16) is fixedly installed at the top output end of the motor (15).

5. A building ventilation and air exchange device according to claim 4, characterized in that: The air extraction assembly includes: a second support (17), a second motor bracket (18), a second motor (19), and a second fan blade (20). The second support (17) is fixedly installed at the top of the rectangular cavity (101). The second support (17) has a ventilation hole (1701) that runs vertically through it. The second ventilation hole (1701) is coaxially connected to the fresh air outlet (103). The second motor (19) is fixedly installed on the lower side of the inner wall of the second ventilation hole (1701) through the second motor bracket (18). The second fan blade (20) is fixedly installed at the top output end of the second motor (19).

6. A building ventilation and air exchange device according to claim 5, characterized in that: Also includes: The rectangular cavity (101) is located below the rear port of the outdoor connecting pipe (3) and has two π-shaped card holders (21) symmetrically fixedly connected on the left and right sides. The lower filter layer (22) is slidably inserted and fixed in the two π-shaped card holders (21). The rectangular cavity (101) is located above the rear port of the outdoor connecting pipe (3) and has six π-shaped card holders (21) symmetrically fixedly connected from bottom to top on the left and right sides. The upper filter layer (23), filter layer (24) and filter layer (25) are slidably inserted into the six π-shaped card holders (21) respectively from bottom to top.

7. A building ventilation and air exchange device according to claim 6, characterized in that: The lower filter layer (22) and the upper filter layer (23) are both stainless steel filter screens, the second filter layer (24) is an activated carbon filter layer, and the third filter layer (25) is a HEPA filter screen.

8. A building ventilation and air exchange device according to claim 1, characterized in that: The bottom of the box (1) is fixedly connected to an exhaust air inlet pipe (26), which is coaxially connected to the exhaust air inlet (102); the top of the box (1) is fixedly connected to a fresh air outlet pipe (27), which is a right-angle bend pipe. The lower end of the fresh air outlet pipe (27) is coaxially connected to the fresh air outlet (103). The rear end of the fresh air outlet pipe (27) is ball-jointed with a ball head (28), which has an axial through hole. The outer end of the ball head (28) is fixedly connected to an air outlet pipe (29), which is coaxially connected to the axial through hole.

9. A building ventilation and air exchange device according to claim 1, characterized in that: Also includes: A sealing gasket (30) is pressed between the box body (1) and the box cover (2).

10. A building ventilation and air exchange device according to claim 1, characterized in that: The box (1) has four ear plates (31) symmetrically arranged at the four corners on the side facing the outdoor connecting pipe (3), and the ear plates (31) are provided with connection holes.

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