Green building energy-saving ventilation device

Abstract

The application discloses a kind of green building energy-saving ventilation devices, it is related to green building technical field, specifically a kind of green building energy-saving ventilation device, including cleaning frame, the one end of the cleaning frame is fixedly connected with the one end of first filter frame, the other end of the first filter frame is fixedly connected with air inlet bin, the bottom of the air inlet bin is fixedly connected with ventilation bin, the one end of the ventilation bin is fixedly connected with second filter frame.The green building energy-saving ventilation device, inside two fans are driven by single motor to rotate in common mode, reduce the resource consumption when two fans start simultaneously, improve the energy-saving effect of ventilation device, and the inside filter plug is provided with cleaning brush outside, unified cleaning is carried out to the dust filtered on filter plug, avoid dust accumulation to cause filter plug to be blocked, at the same time, filter plug is set to detachable structure, cooperate with the locking plug rod in the inside, it is convenient to carry out quick replacement to filter plug, improve the use effect of ventilation device in green building.

Description

Technical Field

[0001] This invention relates to the field of green building technology, specifically to a green building energy-saving ventilation device. Background Technology

[0002] Green building refers to providing people with healthy, suitable, and efficient living spaces throughout its entire life cycle by conserving resources, protecting the environment, and reducing pollution. It is a high-quality building that maximizes the harmonious coexistence between humans and nature. The interior layout of green buildings is very reasonable, minimizing the use of synthetic materials, making full use of sunlight, saving energy, and creating a feeling of closeness to nature for residents. In order to ensure air circulation in the interior of green buildings, ventilation devices are usually used. A ventilation device is a device that uses a physical structure to achieve air circulation between a sealed space and the outside air. Its core function is to regulate the indoor gas environment, maintain gas circulation, and balance air pressure. At the same time, in order to meet the requirements of green buildings, ventilation devices also need to have a certain degree of energy saving.

[0003] Currently: 1. The ventilation device is not energy-efficient when in use. The intake fan and the ventilation fan are running for a long time at the same time, which easily leads to resource waste and cannot meet the needs of green building. 2. Common ventilation devices often have a lot of dust accumulation in their internal filters over long periods of use, which can easily cause filter blockage. In addition, most ventilation devices are one-piece structures, which makes it difficult to disassemble and clean the internal filters, resulting in a reduction in the ventilation effect and thus affecting the effectiveness of the ventilation device in green buildings. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a green building energy-saving ventilation device that solves the problems mentioned in the background technology, such as poor energy-saving effect during use, resource waste caused by the simultaneous operation of intake and exhaust fans for extended periods, and filter clogging when there is a lot of dust in the internal filter, making disassembly and cleaning inconvenient and failing to meet the needs of green buildings.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a green building energy-saving ventilation device, comprising a cleaning frame, one end of which is fixedly connected to one end of a first filter frame, the other end of which is fixedly connected to an air inlet chamber, the bottom of which is fixedly connected to an air exchange chamber, and one end of which is fixedly connected to a second filter frame.

[0006] The cleaning frame has an embedded docking groove, and a limiting groove is provided below the docking groove. A cleaning motor is installed on the top side of the cleaning frame. One end of the cleaning motor is driven and connected to a drive shaft. Both ends of the drive shaft are equipped with drive gears. A driven gear meshes below the drive gear. A cleaning threaded shaft is installed at the bottom center of the driven gear. One end of the cleaning brush is threadedly connected to the external thread of the cleaning threaded shaft.

[0007] A collection chamber is inserted into the lower side of the first filter frame. A filter slot is embedded in the top of the first filter frame. A filter plate is inserted into the filter slot. A locking groove is embedded in the inner wall of the top of the filter slot. A locking rod passes through the inside of the locking groove. A limit plate is fixedly connected to the outside of the locking rod. A compression spring is installed at one end of the limit plate.

[0008] Optionally, the cleaning frame, the first filter frame, the air inlet chamber, the air exchange chamber, and the second filter frame are all hollow frame structures with a U-shape, and the bottom of the cleaning frame and the first filter frame are fixedly connected to the top of the second filter frame, and multiple stainless steel hangers are evenly installed on the outer wall of one end of the cleaning frame and the second filter frame.

[0009] Optionally, there are two docking slots, which are respectively embedded in the top corners of the top of the cleaning frame. The driving gear and the driven gear are both bevel gears, and the driving gear and the driven gear are both located inside the docking slots. The driving gears at both ends of the drive shaft are in opposite directions.

[0010] Optionally, the cleaning threaded shaft is rotatably connected inside the limiting groove, and the external threads of the two cleaning threaded shafts are in opposite directions.

[0011] Optionally, the two ends of the cleaning brush are connected to the cleaning thread shaft and the limiting groove to form a sliding connection structure, and a brush is provided on one side of the cleaning brush, and the brush is in contact with the outer wall of the filter plate.

[0012] Optionally, the collection chamber is a strip-shaped chamber structure with a groove on the top, and the collection chamber is inserted into the connection between the cleaning frame and the first filter frame. The groove on the top of the collection chamber is located directly below the filter insert plate, and a handle is installed at one end of the collection chamber and the top of the filter insert plate.

[0013] Optionally, the top inner wall of the filter slot has locking grooves embedded at both ends, and the compression spring is located outside the locking rod, with one end of the compression spring fixedly connected to the other end of the locking groove.

[0014] Optionally, the limiting plate is slidably connected to the inside of the locking groove, and both ends of the top of one side of the filter insert plate are embedded with insertion holes. When the limiting plate slides to one end of the locking groove, one end of the locking rod penetrates the top inner wall of the filter slot, and one end of the locking rod and the insertion hole form a plug-in connection structure.

[0015] Optionally, an intake motor is installed at the center of the air intake chamber. One end of the intake motor is driven by a drive pulley, and an intake fan is coaxially mounted on one end of the drive pulley. One end of a drive belt is externally connected to the drive pulley. A fixed bracket is installed inside the air exchange chamber. A driven pulley is rotatably connected to the top of the fixed bracket. An air exchange fan is coaxially mounted on one end of the driven pulley, and the driven pulley and the other end of the drive belt form a transmission connection structure. The drive belt passes through the connection between the bottom of the air intake chamber and the top of the air exchange chamber. The blades of the intake fan and the air exchange fan are in opposite directions.

[0016] Optionally, the bottom of the second filter frame is embedded with a filter slot, and the interior of the second filter frame is provided with the same filter insert plate, locking groove, locking rod, limiting plate and compression spring as the interior of the first filter frame.

[0017] This invention provides a green building energy-saving ventilation device, which has the following beneficial effects: This green building energy-saving ventilation device uses a single motor and an internal pulley to drive two fans, reducing resource consumption when the intake and ventilation fans start simultaneously, improving the overall energy-saving effect of the ventilation device, and thus meeting the requirements of green buildings.

[0018] This green building energy-saving ventilation device features a detachable internal filter plate. Compared to common integrated ventilation devices, the filter plate can be removed and replaced when it becomes clogged, thus improving the effectiveness of the ventilation device.

[0019] This green building energy-saving ventilation device features an automatically locking rod in the filter frame to lock the filter plate in place. The filter plate can be opened and locked by simply inserting and removing the locking rod, which further improves the efficiency of filter plate replacement and enhances the ease of use of the ventilation device.

[0020] This green building energy-saving ventilation device has a cleaning component installed on the outside of the filter plate in the air intake chamber to clean the external dust filtered out by the filter plate. This prevents dust from accumulating and clogging the filter plate, thus affecting the filtration effect and extending the service life of the filter plate. This allows the ventilation device to better meet the needs of green buildings.

[0021] This green building energy-saving ventilation device has a removable collection chamber at the bottom of the filter plate outside the cleaning components and air inlet chamber. This chamber collects the dust removed by the cleaning brush, preventing dust from accumulating inside the ventilation device and affecting its normal operation. It also facilitates the unified treatment of the cleaned dust, thereby improving the effectiveness of the ventilation device in green buildings. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the front view structure in the invention; Figure 2 This is a schematic diagram of the rear view structure in the invention; Figure 3 This is a magnified front view of the internal structure of the cleaning frame in this invention; Figure 4 This is a magnified front view of the internal structure of the first filter frame in this invention. Figure 5 This is an exploded magnified view of the first filter frame structure in the invention; Figure 6 This is an exploded magnified schematic diagram of the air intake chamber and air exchange chamber in this invention. Figure 7 This is a schematic diagram of the exploded magnification structure of the second filter frame in the invention.

[0023] In the diagram: 1. Cleaning frame; 101. Docking groove; 102. Limiting groove; 103. Cleaning motor; 104. Drive shaft; 105. Drive gear; 106. Driven gear; 107. Cleaning threaded shaft; 108. Cleaning brush; 2. First filter frame; 201. Collection chamber; 202. Filter slot; 203. Filter insert plate; 204. Locking groove; 205. Locking rod; 206. Limiting plate; 207. Compression spring; 3. Air intake chamber; 301. Air intake motor; 302. Drive pulley; 303. Air intake fan; 304. Transmission belt; 4. Ventilation chamber; 401. Fixed bracket; 402. Driven pulley; 403. Ventilation fan; 5. Second filter frame. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0025] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the 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, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] Please see Figures 1 to 7 The present invention provides a technical solution: a green building energy-saving ventilation device, including a cleaning frame 1, one end of the cleaning frame 1 is fixedly connected to one end of a first filter frame 2, the other end of the first filter frame 2 is fixedly connected to an air inlet chamber 3, the bottom of the air inlet chamber 3 is fixedly connected to an air exchange chamber 4, and one end of the air exchange chamber 4 is fixedly connected to a second filter frame 5.

[0028] The cleaning frame 1 has an embedded docking groove 101, and a limiting groove 102 is provided below the docking groove 101. A cleaning motor 103 is installed on the top side of the cleaning frame 1. One end of the cleaning motor 103 is driven and connected to a drive shaft 104. Both ends of the drive shaft 104 are equipped with drive gears 105. A driven gear 106 meshes below the drive gear 105. A cleaning threaded shaft 107 is installed at the bottom center of the driven gear 106. One end of the cleaning brush 108 is connected to the external thread of the cleaning threaded shaft 107.

[0029] A collection chamber 201 is inserted into the lower side of the first filter frame 2. A filter slot 202 is embedded in the top of the first filter frame 2. A filter plate 203 is inserted into the inside of the filter slot 202. A locking groove 204 is embedded in the inner wall of the top of the filter slot 202. A locking rod 205 passes through the inside of the locking groove 204. A limiting plate 206 is fixedly connected to the outside of the locking rod 205. A compression spring 207 is installed at one end of the limiting plate 206.

[0030] In this embodiment, as Figure 1 and Figure 2As shown, the cleaning frame 1, the first filter frame 2, the air inlet chamber 3, the air exchange chamber 4, and the second filter frame 5 are all hollow frame structures with a U-shape. The bottom of the cleaning frame 1 and the first filter frame 2 are fixedly connected to the top of the second filter frame 5. Multiple stainless steel hangers are evenly installed on the outer wall of one end of the cleaning frame 1 and the second filter frame 5. The stainless steel hangers on the outside of the cleaning frame 1 and the second filter frame 5 in the ventilation device facilitate the use of connectors to fix the ventilation device to the building wall, thereby improving the installation efficiency of the ventilation device.

[0031] In this embodiment, as Figure 3 As shown, there are two docking slots 101, which are respectively embedded in the top corners of the top of the cleaning frame 1. The driving gear 105 and the driven gear 106 are both bevel gears, and the driving gear 105 and the driven gear 106 are both located inside the docking slots 101. The driving gears 105 at both ends of the driving shaft 104 are in opposite directions. The cleaning motor 103 drives the driving shaft 104 to rotate, thereby driving the two driving gears 105 in opposite directions to rotate and mesh with the driven gear 106 below to rotate. The subsequent cleaning brush 108 is driven by the servo motor to reciprocate to clean the outer surface of the filter plate 203, avoiding the tediousness of disassembling the whole for cleaning during manual cleaning and improving the convenience of cleaning the filter plate 203.

[0032] In this embodiment, as Figure 3 As shown, the cleaning threaded shaft 107 is rotatably connected to the inside of the limiting groove 102, and the external threads of the two cleaning threaded shafts 107 are opposite in direction; the two cleaning threaded shafts 107 with opposite external thread directions are matched with the bevel gears meshing with each other at the top, so that the cleaning brush 108 can reciprocate stably in the limiting groove 102, thereby improving the stability of the cleaning brush 108 when it moves.

[0033] In this embodiment, as Figure 1 and Figure 3 As shown, the two ends of the cleaning brush 108 are connected to the cleaning thread shaft 107 and the limiting groove 102 through threads to form a sliding connection structure. A brush is provided on one side of the cleaning brush 108, and the brush is in contact with the outer wall of the filter plate 203. The cleaning brush 108 is set to reciprocate to brush the outer wall of the filter plate 203, brushing away the external dust filtered down by the outer wall of the filter plate 203, preventing dust from accumulating on the outer wall of the filter plate 203 and causing the filter plate 203 to become clogged, thereby increasing the service life of the filter plate 203.

[0034] In this embodiment, as Figure 1 , Figure 4 and Figure 5As shown, the collection chamber 201 is a strip-shaped chamber structure with a groove on the top. The collection chamber 201 is inserted into the connection between the cleaning frame 1 and the first filter frame 2. The groove on the top of the collection chamber 201 is located directly below the filter insert plate 203. A handle is installed at one end of the collection chamber 201 and the top of the filter insert plate 203. The collection chamber 201 is set below the contact surface between the filter insert plate 203 and the brush of the cleaning brush 108 to collect the dust brushed off. This prevents the dust brushed off the filter insert plate 203 from entering the ventilation device and affecting the normal operation of the ventilation device. At the same time, it facilitates the unified treatment of the collected dust, better meeting the needs of green building.

[0035] In this embodiment, as Figure 5 As shown, both ends of the top inner wall of the filter slot 202 are embedded with locking grooves 204, and the compression spring 207 is located outside the locking rod 205, with one end of the compression spring 207 fixedly connected to the other end of the locking groove 204; the compression spring 207 is set to work with the limiting plate 206 to limit the position of the locking rod 205 in the locking groove 204, so as to facilitate the reset after the locking rod 205 is used, thereby improving the use effect of the locking rod 205.

[0036] In this embodiment, as Figure 2 and Figure 5 As shown, the limiting plate 206 is slidably connected to the inside of the locking groove 204, and both ends of the top of one side of the filter insert plate 203 are embedded with insertion holes. When the limiting plate 206 slides to one end of the locking groove 204, one end of the locking rod 205 penetrates the top inner wall of the filter slot 202, and one end of the locking rod 205 forms a plug-in connection structure with the insertion hole. The locking rod 205 is set to lock the filter insert plate 203 in the filter slot 202, which improves the efficiency of installing and removing the filter insert plate 203 and facilitates the removal, replacement and installation of the filter insert plate 203 when needed.

[0037] In this embodiment, as Figure 2 and Figure 6As shown, an intake motor 301 is installed at the center of the air intake chamber 3. One end of the intake motor 301 is driven by a drive pulley 302. An intake fan 303 is coaxially mounted on one end of the drive pulley 302. One end of a drive belt 304 is externally connected to the drive pulley 302. A fixed bracket 401 is installed inside the air exchange chamber 4. A driven pulley 402 is rotatably connected to the top of the fixed bracket 401. An air exchange fan 403 is coaxially mounted on one end of the driven pulley 402. The driven pulley 402 and the other end of the drive belt 304 form a transmission connection structure. The drive belt 304 passes through the connection between the bottom of the air intake chamber 3 and the top of the air exchange chamber 4. The blades of the intake fan 303 and the air exchange fan 403 are in opposite directions. By setting the intake fan 303 and the air exchange fan 403 in the air intake chamber 3 and the air exchange chamber 4 to a single motor drive combined with pulley transmission for air exchange operation, the energy consumption when the two fans start simultaneously is reduced, the energy-saving effect of the air exchange device is improved, and the needs of green building are better met.

[0038] In this embodiment, as Figure 1 , Figure 2 and Figure 7 As shown, the bottom of the second filter frame 5 is embedded with a filter slot 202, and the interior of the second filter frame 5 is provided with the same filter insert plate 203, locking groove 204, locking rod 205, limiting plate 206 and compression spring 207 as the interior of the first filter frame 2. Setting the internal components of the second filter frame 5 to be the same as those of the first filter frame 2 makes it easy to replace the filter insert plate 203 in the second filter frame 5 when needed. At the same time, the setting of the second filter frame 5 prevents external dust from entering the room through one end of the ventilation chamber 4, further improving the performance of the ventilation device.

[0039] In summary, this green building energy-saving ventilation device, when in use: First, connect the stainless steel connectors on the outside of the cleaning frame 1 and the second filter frame 5 in the ventilation device to the base of the installation area and fix them with bolts and other connecting parts. Then, pull the locking rods 205 at the top of the first filter frame 2 and the bottom of the second filter frame 5 outward, so that the limiting plate 206 connected to the locking rod 205 in the internal locking groove 204 squeezes the compression spring 207, so that one end of the locking rod 205 retracts into the locking groove 204. Then, insert the two filter plates 203 into the filter slots 202 in the first filter frame 2 and the second filter frame 5 in sequence, and loosen the four locking rods 205. Under the action of the internal compression spring 207 and the limiting plate 206, one end of the locking rod 205 is inserted and fixed with the insertion hole on the outer wall of the filter plate 203. At the same time, insert the collection chamber 201 into the corresponding position at the connection between the cleaning frame 1 and the lower part of the first filter frame 2, and the installation of the ventilation device is completed. Next, the intake motor 301 in the intake chamber 3 is started to drive the intake fan 303 to rotate, and the outside air enters the room after being filtered through the filter screen in the filter plate 203. At the same time, the drive pulley 302, which is coaxially connected to the intake fan 303, rotates, and drives the driven pulley 402 in the lower air exchange chamber 4 to rotate in the fixed bracket 401 through the transmission belt 304, which in turn drives the coaxially connected ventilation fan 403 to rotate, and the indoor air is discharged after passing through the filter screen in the filter plate 203 in the second filter frame 5, thereby completing the ventilation operation. Finally, when a large amount of dust remains on the filter insert 203 in the first filter frame 2, the cleaning motor 103 is started to drive the drive shaft 104 to rotate in the cleaning frame 1, which in turn drives the drive gears 105 at both ends to rotate in the docking groove 101, thereby meshing with the driven gear 106 below to rotate, which in turn drives the cleaning threaded shaft 107 connected to the bottom of the driven gear 106 to rotate in the limiting groove 102, thereby driving the cleaning brush 108 to slide up and down along the limiting groove 102 to clean the outer wall of the filter insert 203, and causing the cleaned dust to fall into the collection chamber 201 below for centralized collection. When in use, the collection chamber 201 is removed to uniformly process the dust collected inside. At the same time, when necessary, the two filter inserts 203 can also be removed for replacement.

[0040] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0041] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A green building energy-saving ventilation device, comprising a cleaning frame (1), characterized in that: One end of the cleaning frame (1) is fixedly connected to one end of the first filter frame (2), and the other end of the first filter frame (2) is fixedly connected to the air inlet chamber (3). The bottom of the air inlet chamber (3) is fixedly connected to the air exchange chamber (4), and one end of the air exchange chamber (4) is fixedly connected to the second filter frame (5). The cleaning frame (1) has an embedded docking groove (101) inside. A limiting groove (102) is provided below the docking groove (101). A cleaning motor (103) is installed on one side of the top of the cleaning frame (1). One end of the cleaning motor (103) is driven and connected to a drive shaft (104). Both ends of the drive shaft (104) are equipped with drive gears (105). A driven gear (106) meshes below the drive gear (105). A cleaning threaded shaft (107) is installed at the bottom center of the driven gear (106). One end of the cleaning brush (108) is threadedly connected to the external end of the cleaning threaded shaft (107). A collection chamber (201) is inserted into the lower side of the first filter frame (2). A filter slot (202) is embedded in the top of the first filter frame (2). A filter plate (203) is inserted into the inside of the filter slot (202). A locking groove (204) is embedded in the inner wall of the top of the filter slot (202). A locking rod (205) passes through the inside of the locking groove (204). A limiting plate (206) is fixedly connected to the outside of the locking rod (205). A compression spring (207) is installed at one end of the limiting plate (206). The filter slot (202) has locking grooves (204) embedded at both ends of its top inner wall, and the compression spring (207) is located outside the locking rod (205), and one end of the compression spring (207) is fixedly connected to the other end of the locking groove (204). The limiting plate (206) is slidably connected to the inside of the locking groove (204), and the top two ends of the filter insert plate (203) are embedded with insertion holes. When the limiting plate (206) slides to one end of the locking groove (204), one end of the locking rod (205) penetrates the top inner wall of the filter slot (202), and one end of the locking rod (205) and the insertion hole form a plug-in connection structure. The bottom of the second filter frame (5) is embedded with a filter slot (202), and the interior of the second filter frame (5) is provided with the same filter insert plate (203), locking groove (204), locking rod (205), limiting plate (206) and compression spring (207) as the interior of the first filter frame (2).

2. The green building energy-saving ventilation device according to claim 1, characterized in that: The cleaning frame (1), the first filter frame (2), the air inlet chamber (3), the air exchange chamber (4), and the second filter frame (5) are all hollow frame structures with a U-shape. The bottom of the cleaning frame (1) and the first filter frame (2) are fixedly connected to the top of the second filter frame (5). Multiple stainless steel hangers are evenly installed on the outer wall of one end of the cleaning frame (1) and the second filter frame (5).

3. The green building energy-saving ventilation device according to claim 1, characterized in that: There are two docking slots (101), which are respectively embedded in the top corners of the cleaning frame (1). The drive gear (105) and the driven gear (106) are both bevel gears. The drive gear (105) and the driven gear (106) are both located inside the docking slot (101), and the drive gears (105) at both ends of the drive shaft (104) are in opposite directions.

4. The green building energy-saving ventilation device according to claim 3, characterized in that: The cleaning threaded shaft (107) is rotatably connected to the inside of the limiting groove (102), and the external threads of the two cleaning threaded shafts (107) are opposite in direction.

5. A green building energy-saving ventilation device according to claim 1, characterized in that: The two ends of the cleaning brush (108) are connected to the cleaning thread shaft (107) and the limiting groove (102) to form a sliding connection structure. A brush is provided on one side of the cleaning brush (108), and the brush is in contact with the outer wall of the filter insert plate (203).

6. The green building energy-saving ventilation device according to claim 1, characterized in that: The collection chamber (201) is a strip-shaped chamber structure with a groove on the top. The collection chamber (201) is inserted into the connection between the cleaning frame (1) and the first filter frame (2). The groove on the top of the collection chamber (201) is located directly below the filter insert plate (203). A handle is installed at one end of the collection chamber (201) and at the top of the filter insert plate (203).

7. A green building energy-saving ventilation device according to claim 1, characterized in that: An intake motor (301) is installed at the center of the intake chamber (3). One end of the intake motor (301) is driven and connected to a drive pulley (302). An intake fan (303) is coaxially installed at one end of the drive pulley (302). One end of a drive belt (304) is externally connected to the drive pulley (302). A fixed bracket (401) is installed inside the air exchange chamber (4). A driven pulley (402) is rotatably connected to the top of the fixed bracket (401). An air exchange fan (403) is coaxially installed at one end of the driven pulley (402). The driven pulley (402) and the other end of the drive belt (304) form a transmission connection structure. The drive belt (304) passes through the connection between the bottom of the intake chamber (3) and the top of the air exchange chamber (4). The blades of the intake fan (303) and the air exchange fan (403) are in opposite directions.

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