Heat recovery type fresh air ventilation system and method thereof

Abstract

The invention belongs to the technical field of fresh air ventilation, and particularly relates to a heat recovery type fresh air ventilation system and a method thereof.The heat recovery type fresh air ventilation system comprises a machine shell and further comprises a fresh air ventilation assembly used for conducting heat recovery on hot air exhausted out of a room, and the fresh air ventilation assembly is arranged in the machine shell; and the anti-blocking assembly is used for preventing the fresh air exchange assembly from being blocked by utilizing the flowability of air, and the anti-blocking assembly is arranged in the fresh air exchange assembly. By arranging the fresh air exchange assembly, the heat recovery effect on hot air exhausted out of a room can be achieved, heat loss can be avoided by conducting heat recovery on the hot air exhausted out of the room, energy consumption of the electric heating pipe can be reduced to a certain degree, and resources are saved.

Description

Technical Field

[0001] The present invention relates to the technical field of fresh air ventilation, and in particular to a heat recovery type fresh air ventilation system and method thereof. Background Art

[0002] The fresh air ventilation system is a system that can provide fresh air to the room and exhaust dirty air. It is mainly composed of an air supply system and an exhaust system. It uses a fresh air fan to filter and purify the fresh air outside and introduce it into the room, while exhausting the dirty air inside the room to keep the indoor air fresh and healthy.

[0003] However, when the existing fresh air ventilation system is used in winter, the heat generated by it is usually directly discharged from the room. Therefore, in this process, the heat is consumed in the exhaust process, resulting in heat waste, which has limitations. Therefore, a heat recovery fresh air ventilation system and method are invented. Summary of the invention

[0004] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions: A heat recovery fresh air ventilation system, comprising a casing, and further comprising: A fresh air ventilation component for recovering heat from hot air discharged outdoors, and the fresh air ventilation component is arranged in the casing; An anti-clogging component is used to utilize the fluidity of air to avoid clogging of a fresh air ventilation component, and the anti-clogging component is arranged in the fresh air ventilation component.

[0005] As a preferred solution of the heat recovery fresh air ventilation system described in the present invention, the fresh air ventilation component includes: A heat exchange cylinder, wherein the heat exchange cylinder is fixedly mounted on the top right side of the casing; An air pump, the air pump is fixedly mounted on the right bottom end of the casing; An air intake pipe, the air intake pipe is fixedly mounted on the air intake end of the air pump; A cylinder body, wherein the cylinder body is fixedly mounted on the air intake pipe; A filter screen, the filter screen being fixedly mounted on the right end of the cylinder; An air outlet pipe is fixedly mounted on the air outlet end of the air pump, and one end of the air outlet pipe is fixedly mounted on the right bottom end of the heat exchange cylinder.

[0006] As a preferred solution of the heat recovery fresh air ventilation system described in the present invention, the fresh air ventilation component further includes: A heat-insulating annular plate, wherein the heat-insulating annular plate is fixedly mounted on the left top end of the casing, and the heat exchange cylinder is located in the inner cavity of the heat-insulating annular plate; A circular plate, the circular plate being fixedly mounted on the left end of the heat-insulating annular plate; An annular filter screen, wherein the annular filter screen is fixedly mounted on a circular plate; An exhaust pipe, wherein the exhaust pipe is fixedly mounted on the left bottom end of the heat exchange cylinder, and the exhaust pipe passes through the heat insulation annular plate; An electric heating tube is fixedly installed at the bottom end of the inner cavity of the casing; A vent pipe is fixedly mounted on the top right side of the heat-insulating annular plate, and the vent pipe passes through the casing.

[0007] As a preferred solution of the heat recovery fresh air ventilation system described in the present invention, the anti-blocking component includes: A rotating shaft, wherein the heat exchange cylinder and the middle portion of the circular plate are rotatably connected to the rotating shaft via bearings; First stirring plates, a plurality of first stirring plates are fixedly installed on the rotating shaft in the heat exchange cylinder; Second stirring plates, a plurality of second stirring plates are fixedly mounted on the rotating shaft in the heat-insulating annular plate; The wind wheel is fixedly mounted on the right end of the rotating shaft, and an air outlet pipe is arranged below the wind wheel.

[0008] As a preferred solution of the heat recovery fresh air ventilation system described in the present invention, the anti-blocking component further includes: A first square rod, the right bottom end of the rotating shaft is fixedly mounted with the first square rod via a connecting rod; First brush wires, a plurality of first brush wires are provided on one side of the first square rod, and the first brush wires can contact the filter screen when rotating; A second square rod, the second square rod being fixedly mounted on the left bottom end of the rotating shaft; Second brush wires: a plurality of second brush wires are arranged on one side of the second square rod, and the second brush wires are in contact with the annular filter screen.

[0009] As a preferred solution of the heat recovery fresh air ventilation system described in the present invention, it also includes: The regulating component is used for regulating the flow direction of wind, and the regulating component is arranged on the bottom of the casing.

[0010] As a preferred solution of the heat recovery fresh air ventilation system described in the present invention, the regulating component includes: A frame, wherein the frame is detachably connected to the bottom of the housing through a connecting assembly; A rotating rod, the bottom end of the square frame is rotatably connected to a plurality of rotating rods through a bearing; A guide plate is fixedly mounted on the rotating rod.

[0011] As a preferred solution of the heat recovery fresh air ventilation system described in the present invention, the regulating component further includes: A servo motor, wherein the servo motor is fixedly mounted on the outer surface of the frame, and an output shaft of the servo motor is fixedly connected to a set of rotating rods; A first synchronous belt pulley, wherein the first synchronous belt pulley is fixedly mounted on the inner side of the rotating rod, and two sets of first synchronous belt pulleys are connected through a first synchronous belt transmission; The second synchronous belt pulley is fixedly mounted on the outer side of the rotating rod, and the two sets of second synchronous belt pulleys are connected through the second synchronous belt transmission, and the first synchronous belt and the second synchronous belt are arranged in a staggered manner.

[0012] As a preferred solution of the heat recovery fresh air ventilation system described in the present invention, the connection component includes: Limiting grooves: a plurality of limiting grooves are provided on the top of the square frame; Limit blocks, a plurality of limit blocks are fixedly installed on the bottom of the housing, and the limit blocks are inserted into the limit grooves; Positioning rods, the bottom side wall of the housing is slidably connected to a plurality of positioning rods; A positioning groove, wherein a positioning groove is provided on the outer side of the limit block, and one end of the positioning rod is inserted into the positioning groove; A magnet, wherein the magnet is fixedly mounted on the other end of the positioning rod; A spring, wherein the spring is sleeved on the positioning rod, and two ends of the spring are fixedly connected to the magnet and the housing respectively; L-shaped iron plates, a plurality of L-shaped iron plates are fixedly installed on the bottom side wall of the casing, and the magnet can be adsorbed on the L-shaped iron plates.

[0013] A heat recovery fresh air ventilation method comprises the following specific steps: Step 1: Use the servo motor to rotate the rotating rod until the guide plate is at a suitable angle; Step 2: The new air is pumped into the room through the filter, cylinder, air inlet pipe, air outlet pipe, heat exchange cylinder, ventilation pipe and frame in sequence. In this process, the new air is filtered by the filter and heated by the electric heating pipe. Step 3: The indoor air is exhausted to flow into the heat-insulating annular plate. At this time, the air flowing into the heat-insulating annular plate will exchange heat with the air in the heat exchange cylinder, so as to recycle the heat of the indoor air exhausted. In this process, the indoor air will be filtered through the annular filter. Step 4: When new air flows into the heat exchange cylinder, the shaft will rotate through the wind wheel. When the shaft rotates, the first square rod and the second square rod will rotate. When the first square rod and the second square rod rotate, the impurities on the filter and the annular filter will be removed by the first brush and the second brush to avoid clogging of the filter and the annular filter. At the same time, the first stirring plate and the second stirring plate will also rotate to stir the new air and the old air, thereby further improving the heat exchange effect of the new air and the old air.

[0014] Compared with existing technologies: 1. By setting up the fresh air ventilation component, it can realize the heat recovery of the hot air discharged outdoors. By recovering the heat of the hot air discharged outdoors, it can not only avoid heat loss, but also reduce the energy consumption of the electric heating pipe to a certain extent, saving resources; 2. By setting up the anti-blocking component, not only can the blockage of the fresh air ventilation component be avoided, but the air can also be stirred to improve the heat exchange effect; in addition, since the anti-blocking component is operated by utilizing the fluidity of the air, the cost investment will be reduced to a certain extent; 3. By setting up the adjustment component, it is possible to adjust the direction of the wind, and thus the direction of the wind can be adjusted accordingly according to demand, thereby improving the flexibility of use; in addition, by setting up the connecting component to install the adjustment component, it is convenient for personnel to disassemble and assemble the adjustment component, thereby improving convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view schematic diagram of the structure of the present invention; Figure 2 For the present invention Figure 1 A schematic diagram of the structure enlargement in the middle; Figure 3 For the present invention Figure 1 A magnified schematic diagram of the structure at B in the middle; Figure 4 It is a bottom view schematic diagram of the adjustment assembly of the present invention; Figure 5 For the present invention Figure 4 A magnified schematic diagram of the structure at C in the middle; Figure 6 It is a schematic diagram of the casing structure of the present invention; Figure 7 It is a schematic side view of the heat exchange cylinder, the air outlet pipe, the rotating shaft and the wind wheel structure of the present invention; Figure 8 It is a schematic side view of the structure of the rotating shaft and the first stirring plate of the present invention; Fig. 9 It is a front view schematic diagram of the connecting component structure of the present invention.

[0016] In the figure: casing 10, heat exchange cylinder 20, air pump 21, air inlet pipe 22, cylinder 23, filter 24, air outlet pipe 25, heat insulation annular plate 26, circular plate 27, annular filter 28, exhaust pipe 29, electric heating pipe 291, ventilation pipe 292, rotating shaft 30, first stirring plate 31, second stirring plate 32, wind wheel 33, connecting rod 34, first square rod 35, first brush wire 36, second square rod 37, second brush wire 38, square frame 40, rotating rod 41, guide plate 42, servo motor 43, first synchronous pulley 44, first synchronous belt 45, second synchronous pulley 46, second synchronous belt 47, limit groove 50, limit block 51, positioning rod 52, positioning groove 53, magnet 54, spring 55, L-shaped iron plate 56. DETAILED DESCRIPTION

[0017] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0018] The present invention provides a heat recovery fresh air ventilation system, please refer to Figure 1-Figure 9 , comprising a housing 10; It also includes: a fresh air ventilation component for recovering heat from hot air discharged outdoors, and the fresh air ventilation component is arranged in the casing 10; The fresh air ventilation assembly includes: a heat exchange cylinder 20, an air pump 21, an air inlet pipe 22, a cylinder 23, a filter 24, an air outlet pipe 25, a heat insulation annular plate 26, a circular plate 27, an annular filter 28, an exhaust pipe 29, an electric heating pipe 291, and a ventilation pipe 292; The heat exchange cylinder 20 is fixedly mounted on the top right side of the casing 10, the air pump 21 is fixedly mounted on the bottom right side of the casing 10, the air inlet pipe 22 is fixedly mounted on the air inlet end of the air pump 21, the cylinder 23 is fixedly mounted on the air inlet pipe 22, the filter screen 24 is fixedly mounted on the right end of the cylinder 23, the air outlet pipe 25 is fixedly mounted on the air outlet end of the air pump 21, and one end of the air outlet pipe 25 is fixedly mounted on the bottom right side of the heat exchange cylinder 20, and the heat insulation annular plate 26 is fixedly mounted on the left side of the casing 10. The heat exchange cylinder 20 is located in the inner cavity of the heat insulation annular plate 26, the circular plate 27 is fixedly mounted on the left end of the heat insulation annular plate 26, the annular filter screen 28 is fixedly mounted on the circular plate 27, the exhaust pipe 29 is fixedly mounted on the left bottom end of the heat exchange cylinder 20, and the exhaust pipe 29 passes through the heat insulation annular plate 26, the electric heating pipe 291 is fixedly mounted on the bottom end of the inner cavity of the casing 10, and the ventilation pipe 292 is fixedly mounted on the right top end of the heat insulation annular plate 26, and the ventilation pipe 292 passes through the casing 10.

[0019] It also includes: an anti-blocking component for utilizing the fluidity of air to avoid blockage of the fresh air ventilation component, and the anti-blocking component is arranged in the fresh air ventilation component; The anti-blocking assembly includes: a rotating shaft 30, a first stirring plate 31, a second stirring plate 32, a wind wheel 33, a connecting rod 34, a first square rod 35, a first brush wire 36, a second square rod 37, and a second brush wire 38; The middle parts of the heat exchange cylinder 20 and the circular plate 27 are rotatably connected to the rotating shaft 30 through bearings. A plurality of first stirring plates 31 are fixedly installed on the rotating shaft 30 in the heat exchange cylinder 20, and a plurality of second stirring plates 32 are fixedly installed on the rotating shaft 30 in the heat insulation annular plate 26. A wind wheel 33 is fixedly installed on the right end of the rotating shaft 30, and an air outlet pipe 25 is provided below the wind wheel 33. A first square rod 35 is fixedly installed on the right bottom end of the rotating shaft 30 through a connecting rod 34, and a plurality of first brush wires 36 are provided on one side of the first square rod 35, and when the first brush wire 36 rotates, it can contact the filter screen 24, and a second square rod 37 is fixedly installed on the left bottom end of the rotating shaft 30, and a plurality of second brush wires 38 are provided on one side of the second square rod 37, and the second brush wires 38 are in contact with the annular filter screen 28.

[0020] It also includes: an adjustment component for adjusting the flow direction of wind, and the adjustment component is arranged on the bottom of the housing 10; The adjustment assembly includes: a square frame 40, a rotating rod 41, a guide plate 42, a servo motor 43, a first synchronous pulley 44, a first synchronous belt 45, a second synchronous pulley 46, and a second synchronous belt 47; The box frame 40 is detachably connected to the bottom of the casing 10 through a connecting assembly, the bottom end of the box frame 40 is rotatably connected to a plurality of rotating rods 41 through a bearing, the guide plate 42 is fixedly mounted on the rotating rod 41, the servo motor 43 is fixedly mounted on the outer surface of the box frame 40, and the output shaft of the servo motor 43 is fixedly connected to a group of rotating rods 41, the first synchronous pulley 44 is fixedly mounted on the inner side of the rotating rod 41, and the two groups of first synchronous pulleys 44 are connected by transmission through a first synchronous belt 45, the second synchronous pulley 46 is fixedly mounted on the outer side of the rotating rod 41, and the two groups of second synchronous pulleys 46 are connected by transmission through a second synchronous belt 47, and the first synchronous belt 45 and the second synchronous belt 47 are arranged in a staggered manner.

[0021] The connecting assembly includes: a limiting groove 50, a limiting block 51, a positioning rod 52, a positioning groove 53, a magnet 54, a spring 55, and an L-shaped iron plate 56; A plurality of limit grooves 50 are provided at the top of the frame 40, a plurality of limit blocks 51 are fixedly installed at the bottom of the casing 10, and the limit blocks 51 are inserted in the limit grooves 50, a plurality of positioning rods 52 are slidably connected to the bottom side wall of the casing 10, a positioning groove 53 is provided on the outer side of the limit block 51, and one end of the positioning rod 52 is inserted in the positioning groove 53, a magnet 54 is fixedly installed on the other end of the positioning rod 52, a spring 55 is sleeved on the positioning rod 52, and the two ends of the spring 55 are fixedly connected to the magnet 54 and the casing 10 respectively, a plurality of L-shaped iron plates 56 are fixedly installed on the bottom side wall of the casing 10, and the magnet 54 can be adsorbed on the L-shaped iron plate 56.

[0022] A heat recovery fresh air ventilation method comprises the following specific steps: Step 1: The servo motor 43 is used to rotate the rotating rod 41 until the guide plate 42 is at a suitable angle; Step 2: The air pump 21 allows the new air to flow into the room through the filter 24, the cylinder 23, the air inlet pipe 22, the air outlet pipe 25, the heat exchange cylinder 20, the ventilation pipe 292 and the frame 40 in sequence. In this process, the new air is filtered by the filter 24 and then heated by the electric heating pipe 291; Step 3: The indoor air is discharged into the heat-insulating annular plate 26. At this time, the air flowing into the heat-insulating annular plate 26 will exchange heat with the air in the heat exchange cylinder 20, so as to recycle the heat of the indoor air discharged. In this process, the indoor air will be filtered through the annular filter 28; Step 4: When new air flows into the heat exchange cylinder 20, the shaft 30 will be rotated by the wind wheel 33. When the shaft 30 rotates, the first square rod 35 and the second square rod 37 will be rotated. When the first square rod 35 and the second square rod 37 rotate, the impurities on the filter 24 and the annular filter 28 will be removed by the first brush 36 and the second brush 38 to avoid clogging of the filter 24 and the annular filter 28. At the same time, the first stirring plate 31 and the second stirring plate 32 will also rotate to stir the new air and the old air, thereby further improving the heat exchange effect of the new air and the old air.

[0023] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A heat recovery fresh air ventilation system, comprising a casing (10), characterized in that: Also includes: A fresh air ventilation component for recovering heat from hot air discharged outdoors, wherein the fresh air ventilation component is arranged in the casing (10); An anti-clogging component is used to utilize the fluidity of air to avoid clogging of a fresh air ventilation component, and the anti-clogging component is arranged in the fresh air ventilation component.

2. A heat recovery fresh air ventilation system according to claim 1, characterized in that: The fresh air ventilation component comprises: A heat exchange cylinder (20), wherein the heat exchange cylinder (20) is fixedly mounted on the top right side of the casing (10); An air pump (21), the air pump (21) being fixedly mounted on the right bottom end of the housing (10); An air intake pipe (22), wherein the air intake pipe (22) is fixedly mounted on an air intake end of the air pump (21); A cylinder (23), wherein the cylinder (23) is fixedly mounted on the air intake pipe (22); A filter screen (24), wherein the filter screen (24) is fixedly mounted on the right end of the cylinder (23); An air outlet pipe (25), wherein the air outlet pipe (25) is fixedly mounted on the air outlet end of the air pump (21), and one end of the air outlet pipe (25) is fixedly mounted on the right bottom end of the heat exchange cylinder (20).

3. A heat recovery fresh air ventilation system according to claim 2, characterized in that: The fresh air ventilation component also includes: a heat-insulating annular plate (26), the heat-insulating annular plate (26) being fixedly mounted on the left top end of the casing (10), and the heat-exchanging cylinder (20) being located in the inner cavity of the heat-insulating annular plate (26); a circular plate (27), wherein the circular plate (27) is fixedly mounted on the left end of the heat-insulating annular plate (26); an annular filter screen (28), wherein the annular filter screen (28) is fixedly mounted on the circular plate (27); an exhaust pipe (29), the exhaust pipe (29) being fixedly mounted on the left bottom end of the heat exchange cylinder (20), and the exhaust pipe (29) passing through the heat insulation annular plate (26); An electric heating tube (291), the electric heating tube (291) being fixedly mounted at the bottom end of the inner cavity of the housing (10); A ventilation pipe (292), wherein the ventilation pipe (292) is fixedly mounted on the top right side of the heat-insulating annular plate (26), and the ventilation pipe (292) passes through the casing (10).

4. A heat recovery fresh air ventilation system according to claim 3, characterized in that: The anti-blocking component comprises: A rotating shaft (30), wherein the heat exchange cylinder (20) and the middle portion of the circular plate (27) are rotatably connected to the rotating shaft (30) via bearings; First stirring plates (31), a plurality of first stirring plates (31) are fixedly mounted on the rotating shaft (30) in the heat exchange cylinder (20); Second stirring plates (32), a plurality of second stirring plates (32) being fixedly mounted on the rotating shaft (30) in the heat-insulating annular plate (26); A wind wheel (33) is fixedly mounted on the right end of the rotating shaft (30), and an air outlet pipe (25) is provided below the wind wheel (33).

5. A heat recovery fresh air ventilation system according to claim 4, characterized in that: The anti-blocking component also includes: A first square rod (35), the right bottom end of the rotating shaft (30) being fixedly mounted with the first square rod (35) via a connecting rod (34); First brush filaments (36), wherein a plurality of first brush filaments (36) are provided on one side of the first square rod (35), and when the first brush filaments (36) rotate, they can contact the filter screen (24); A second square rod (37), the second square rod (37) being fixedly mounted on the left bottom end of the rotating shaft (30); Second brush wires (38), a plurality of second brush wires (38) are provided on one side of the second square rod (37), and the second brush wires (38) are in contact with the annular filter screen (28).

6. A heat recovery fresh air ventilation system according to claim 1, characterized in that: Also includes: An adjusting component is used to adjust the flow direction of wind, and the adjusting component is arranged on the bottom of the casing (10).

7. A heat recovery fresh air ventilation system according to claim 6, characterized in that: The adjustment component comprises: A square frame (40), wherein the square frame (40) is detachably connected to the bottom of the housing (10) via a connecting assembly; A rotating rod (41), wherein the bottom end of the square frame (40) is rotatably connected to a plurality of rotating rods (41) via a bearing; A guide plate (42), wherein the guide plate (42) is fixedly mounted on the rotating rod (41).

8. A heat recovery fresh air ventilation system according to claim 7, characterized in that: The adjustment component also includes: A servo motor (43), wherein the servo motor (43) is fixedly mounted on the outer surface of the frame (40), and an output shaft of the servo motor (43) is fixedly connected to a set of rotating rods (41); A first synchronous belt pulley (44), wherein the first synchronous belt pulley (44) is fixedly mounted on the inner side of the rotating rod (41), and two sets of first synchronous belt pulleys (44) are connected in transmission via a first synchronous belt (45); The second synchronous belt pulley (46) is fixedly mounted on the outer side of the rotating rod (41), and the two sets of second synchronous belt pulleys (46) are connected by a second synchronous belt (47), and the first synchronous belt (45) and the second synchronous belt (47) are arranged in a staggered manner.

9. A heat recovery fresh air ventilation system according to claim 8, characterized in that: The connection component comprises: Limiting grooves (50), a plurality of limiting grooves (50) are provided at the top of the square frame (40); Limit blocks (51), a plurality of limit blocks (51) are fixedly mounted on the bottom of the housing (10), and the limit blocks (51) are inserted into the limit grooves (50); Positioning rods (52), the bottom side wall of the housing (10) being slidably connected to a plurality of positioning rods (52); A positioning groove (53), wherein the outer side of the limit block (51) is provided with a positioning groove (53), and one end of the positioning rod (52) is inserted into the positioning groove (53); a magnet (54), wherein the magnet (54) is fixedly mounted on the other end of the positioning rod (52); A spring (55), wherein the spring (55) is sleeved on the positioning rod (52), and two ends of the spring (55) are respectively fixedly connected to the magnet (54) and the housing (10); L-shaped iron plates (56), a plurality of L-shaped iron plates (56) are fixedly mounted on the bottom side wall of the housing (10), and the magnets (54) can be adsorbed on the L-shaped iron plates (56).

10. A heat recovery fresh air ventilation method, characterized in that: The specific steps are as follows: Step 1: The rotating rod (41) is rotated by the servo motor (43) until the guide plate (42) is at a suitable angle; Step 2: The air pump (21) allows new air to flow into the room through the filter (24), the cylinder (23), the air inlet pipe (22), the air outlet pipe (25), the heat exchange cylinder (20), the ventilation pipe (292) and the frame (40) in sequence. During this process, the new air is filtered by the filter (24) and then heated by the electric heating pipe (291); Step 3: allowing the indoor air to flow into the heat-insulating annular plate (26). At this time, the air flowing into the heat-insulating annular plate (26) will exchange heat with the air in the heat exchange cylinder (20), so that the heat of the indoor air can be recovered and utilized. In this process, the indoor air will be filtered through the annular filter (28); Step 4: When new air flows into the heat exchange cylinder (20), the wind wheel (33) causes the rotating shaft (30) to rotate. When the rotating shaft (30) rotates, the first square rod (35) and the second square rod (37) rotate. When the first square rod (35) and the second square rod (37) rotate, impurities on the filter screen (24) and the annular filter screen (28) are removed by the first brush wire (36) and the second brush wire (38) to avoid clogging of the filter screen (24) and the annular filter screen (28). At the same time, the first stirring plate (31) and the second stirring plate (32) also rotate to stir the new air and the old air, thereby further improving the heat exchange effect of the new air and the old air.

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