Fresh air ventilator with bypass function

Abstract

The utility model provides a fresh air ventilator with a bypass function, and belongs to the technical field of fresh air equipment. The technical problems that when total heat exchange is not needed, an existing fresh air machine enables a total heat exchange module to participate in the ventilation process all the time, so that energy consumption is increased, and the service life is shortened are solved. An inner shell of the fresh air machine with the bypass function is divided into a bypass cavity and a heat exchange cavity through a partition plate, a total heat exchange module is installed in the heat exchange cavity, a bypass body is rotatably installed in the bypass cavity, and ventilation openings communicating with the bypass cavity are formed in the four peripheral faces of the inner shell correspondingly. An air return channel and a fresh air channel which are perpendicular to each other are arranged in the bypass body and are not communicated with each other, and the bypass body is rotated to control the air return channel and the fresh air channel to be communicated with or closed with the ventilation opening. The total heat exchange module is simple in structure, convenient to operate, capable of controlling whether heat exchange is needed or not according to needs, beneficial to reducing energy consumption and capable of prolonging the service life of the total heat exchange module.

Description

Technical Field

[0001] The utility model belongs to the technical field of fresh air equipment, in particular to a fresh air fan with a bypass function. Background Art

[0002] The existing full heat exchange fresh air fan has a total of four air outlets, fresh air inlet, fresh air outlet, exhaust air inlet, and exhaust air outlet, to achieve the function of energy exchange and recovery between fresh air and exhaust air inside the unit. The position of each air outlet is designed according to the air duct setting inside the unit before the unit leaves the factory. The engineering installation will set the fresh air duct network and exhaust duct network according to the air outlet position of the unit.

[0003] However, in spring and autumn, the temperature difference and humidity between indoor and outdoor are small, so the fresh air fan only needs to achieve ventilation, and there is no need for energy exchange and recovery.

[0004] If the full heat exchange module is still allowed to participate in the ventilation process at this time, it will lead to problems such as increased energy consumption and shortened service life of the full heat exchange module. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a new air fan with a bypass function that can reduce energy consumption, increase the service life of a full heat exchange module.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A fresh air fan with a bypass function comprises a rectangular outer shell, an inner shell and a full heat exchange module, wherein the inner shell is arranged in the outer shell, and the connection between the four outer peripheral surfaces of the inner shell and the inner wall of the outer shell is fixedly connected by a connecting plate, a fresh air inlet and a return air outlet are arranged on the front side of the outer shell, and a fresh air outlet and a return air inlet are arranged on the rear side, and the fresh air inlet and the fresh air outlet are arranged staggered, and the characteristic is that: the inner shell is divided into a bypass chamber and a heat exchange chamber by a partition, and the full heat exchange module It is installed in the heat exchange chamber, and a bypass body is rotatably installed in the bypass chamber. Ventilation holes are provided on the outer peripheral surface of the inner shell body corresponding to the fresh air inlet and the fresh air outlet. The vents are connected with the bypass chamber. A fresh air channel is provided in the bypass body. A fresh air heat exchange valve is provided in the outer shell body. The fresh air heat exchange valve is provided between the full heat exchange module and the fresh air inlet. The fresh air heat exchange valve is used to control whether fresh air enters the full heat exchange module, and the bypass body is rotated to control the connection or closure of the fresh air channel and the vents.

[0008] The fresh air blower sets a bypass chamber and a heat exchange chamber in the inner shell. When heat exchange is required, the bypass body in the bypass chamber controls the closure of the fresh air channel, the fresh air heat exchange valve opens, and the fresh air and return air flow through the full heat exchange module in the heat exchange chamber, thereby achieving heat exchange; when heat exchange is not required, the bypass body in the bypass chamber rotates, controls the opening of the fresh air channel, closes the fresh air heat exchange valve, and the fresh air flows through the fresh air channel in the bypass body, and the return air continues to be discharged through the full heat exchange module, thereby achieving indoor and outdoor ventilation. The fresh air blower has a simple structure and is easy to operate. It can control whether heat exchange is required according to needs, which is conducive to reducing energy consumption and increasing the service life of the full heat exchange module.

[0009] In the above-mentioned fresh air fan with bypass function, ventilation holes connected to the bypass chamber are provided on the four outer peripheral surfaces of the inner shell, and a return air channel and a fresh air channel that are not connected to each other are provided in the bypass body, and the projections of the return air channel and the fresh air channel on the horizontal plane are perpendicular to each other, and the return air channel and the fresh air channel are staggered in the vertical direction, and the bypass body is rotated to control the connection or closure of the return air channel and the fresh air channel with the ventilation holes, and a return air heat exchange valve is provided in the outer shell, and the return air heat exchange valve is provided between the full heat exchange module and the return air inlet, and the return air heat exchange valve is used to control whether the return air enters the full heat exchange module.

[0010] The fresh air blower is provided with a bypass chamber and a heat exchange chamber in the inner shell. When heat exchange is required, the bypass body in the bypass chamber controls the closure of the fresh air channel and the return air channel, the fresh air heat exchange valve and the return air heat exchange valve are opened, and the fresh air and the return air flow through the full heat exchange module in the heat exchange chamber, thereby realizing heat exchange; when heat exchange is not required, the bypass body in the bypass chamber rotates, controls the opening of the fresh air channel and the return air channel, and closes the fresh air heat exchange valve and the return air heat exchange valve, and the fresh air and the return air flow through the fresh air channel and the return air channel in the bypass body, respectively, thereby realizing indoor and outdoor ventilation. The fresh air blower has a simple structure and is easy to operate. It can control whether heat exchange is required according to needs, which is conducive to reducing energy consumption and increasing the service life of the full heat exchange module. Furthermore, the return air channel and the fresh air channel, which are perpendicular to each other in the horizontal projection, are convenient to design, have high stability during operation, and can realize the opening or closing of the bypass function by both forward and reverse rotation; the staggered arrangement of the return air channel and the fresh air channel in the vertical direction can avoid the mixing of the return air and the fresh air, which is conducive to improving the ventilation effect.

[0011] In the above-mentioned fresh air fan with bypass function, the bypass chamber and the bypass body are both cylindrical, and the central angle α of the openings at both ends of the return air channel and the openings at both ends of the fresh air channel is less than or equal to 45°. When the return air channel and the fresh air channel are staggered with the air vents, the openings at both ends of the return air channel and the fresh air channel can be completely blocked by the inner wall of the bypass chamber.

[0012] The limitation of the opening width at both ends of the fresh air channel and the return air channel can ensure that the fresh air channel and the return air channel can be completely closed when bypass is not required, which is beneficial to improving the stability of the fresh air fan during operation.

[0013] In the above-mentioned fresh air fan with bypass function, a large transmission gear is fixedly connected to the top of the bypass body, and the bypass body can rotate synchronously with the large transmission gear. A driving motor is fixedly connected to the outer peripheral surface of the inner shell, and a driving gear is fixedly connected to the driving shaft of the driving motor. The driving gear is directly meshed with the large transmission gear or is connected to the large transmission gear through a small transmission gear.

[0014] The bypass body is driven to rotate by means of multi-stage gears, and the transmission structure is stable. At the same time, the large transmission gear connected to the bypass body is much larger than the driving gear. Therefore, the angular velocity of the bypass body rotation is slower, and the rotation angle of the bypass body can be more accurately controlled, which is beneficial to improving the control accuracy of the new air fan.

[0015] In the above-mentioned fresh air fan with bypass function, the inner shell, the outer shell and the four connecting plates together form a fresh air inlet chamber, a return air outlet chamber, a fresh air outlet chamber and a return air inlet chamber, the fresh air inlet chamber is respectively connected with the fresh air inlet and a vent, the return air outlet chamber is respectively connected with the return air outlet and a vent, the fresh air outlet chamber is respectively connected with the fresh air outlet and a vent, the return air inlet chamber is respectively connected with the return air inlet and a vent, fans are installed in the fresh air outlet chamber and the return air outlet chamber, the fresh air heat exchange valve is installed in the fresh air inlet chamber, and the return air heat exchange valve is installed in the return air inlet chamber.

[0016] The above-mentioned independent fresh air inlet chamber, return air outlet chamber, fresh air outlet chamber and return air inlet chamber design, combined with the fans installed in the fresh air outlet chamber and the return air outlet chamber, can make the flow of fresh air and return air smoother and improve the ventilation efficiency; the design of the fresh air heat exchange valve and the return air heat exchange valve can control whether the full heat exchange module participates in the ventilation process, with a simple structure, easy control and high stability.

[0017] In the above-mentioned fresh air fan with bypass function, the drive motor is arranged in the fresh air inlet cavity or the return air inlet cavity, the drive motor is fixed to the upper part of the outer wall of the inner shell, and the drive motor is staggered with the air vent.

[0018] Since fans are provided in both the fresh air outlet chamber and the return air outlet chamber of the fresh air fan, the installation space in the above-mentioned two air outlet chambers is limited. If a driving motor is installed, it may affect the normal flow of air in the two air outlet chambers; while the fresh air inlet chamber or the return air inlet chamber is relatively empty, the driving motor installed in the above-mentioned two air inlet chambers has little effect on the normal flow of air. At the same time, the driving motor is fixed to the upper part of the outer wall of the inner shell and is staggered with the vents to minimize the impact of the driving motor on air circulation, which is beneficial to improving the stability of the fresh air fan during operation.

[0019] In the above-mentioned fresh air fan with bypass function, filter nets are provided in the fresh air inlet chamber and the return air inlet chamber, and the filter nets can block the fresh air inlet and the return air inlet. The fresh air and the return air must pass through the corresponding filter nets before they can enter the fresh air inlet chamber or the return air inlet chamber.

[0020] The design of the above-mentioned filter can effectively filter impurities such as hair and dust particles in the air, making the air fresher. At the same time, it can also prevent impurities such as hair and dust particles from entering the full heat exchange module or the bypass body, which is beneficial to increasing the service life of the full heat exchange module and improving the stability of the bypass body.

[0021] In the above-mentioned fresh air fan with bypass function, the outer shell includes a frame, an upper cover and a lower cover, the upper cover and the lower cover are both sealed with the frame, the upper side and the lower side of the frame are both provided with sealing grooves, and the upper cover and the lower cover are both provided with sealing ridges that can be inserted into the sealing grooves on the side facing the frame.

[0022] The connection structure of the upper cover, the frame and the lower cover can make the connection between the three more firm and have better sealing performance.

[0023] In the above-mentioned fresh air fan with bypass function, a receiving groove for accommodating a driving gear, a large transmission gear and a small transmission gear is provided on the lower side surface of the upper cover; an inspection port for facilitating replacement of the full heat exchange module is provided on the lower cover, and a maintenance cover is detachably installed at the inspection port.

[0024] The design of the accommodating groove enables the driving gear, large transmission gear and small transmission gear to rotate normally; the design of the inspection port and inspection cover facilitates the replacement of the full heat exchange module without removing the entire lower cover, making maintenance more convenient.

[0025] Compared with the prior art, the technical effects of the utility model are:

[0026] The utility model has the advantages of simple structure, convenient operation, and can control whether heat exchange is needed according to the needs, which is beneficial to reducing energy consumption and increasing the service life of the full heat exchange module. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the explosion structure of the first embodiment of the utility model.

[0028] Figure 2 It is a top view schematic diagram of the first embodiment of the utility model.

[0029] Figure 3 yes Figure 2 Cross-sectional view at AA in the middle.

[0030] Figure 4 It is a structural schematic diagram of the bypass body of the first embodiment of the utility model.

[0031] Figure 5 It is a schematic diagram of the explosion structure of the second embodiment of the utility model.

[0032] Figure 6 It is a cross-sectional view of the second embodiment of the utility model Figure 1 .

[0033] Figure 7 It is a cross-sectional view of the second embodiment of the utility model Figure 2 .

[0034] Figure 8 It is a schematic diagram of the internal structure of the second embodiment of the utility model.

[0035] Fig. 9 It is a structural schematic diagram of the bypass body of the second embodiment of the utility model.

[0036] Fig.10 It is a cross-sectional view of the bypass main body in the return air channel direction of the utility model.

[0037] Fig.11 It is a cross-sectional view of the bypass main body of the utility model in the direction of the fresh air channel.

[0038] Fig.12 This is a schematic diagram of the structure of the frame and inner shell of the utility model. Figure 1 .

[0039] Fig.13 This is a schematic diagram of the structure of the frame and inner shell of the utility model. Figure 2 .

[0040] Fig.14 It is a structural schematic diagram and a partial enlarged diagram of the upper cover of the utility model.

[0041] In the figure, 1, outer shell; 11, fresh air inlet chamber; 111, fresh air inlet; 112, fresh air heat exchange valve; 12, fresh air outlet chamber; 121, fresh air outlet; 13, return air inlet chamber; 131, return air inlet; 132, return air heat exchange valve; 14, return air outlet chamber; 141, return air outlet; 15, fan; 16, connecting plate; 17, frame; 171, sealing groove; 18, upper cover; 181. Receiving groove; 19. Lower cover; 191. Inspection port; 192. Inspection cover; 100. Sealing ridge; 2. Inner shell; 21. Bypass chamber; 211. Ventilation port; 22. Heat exchange chamber; 221. Full heat exchange module; 3. Bypass body; 31. Fresh air channel; 32. Return air channel; 4. Driving motor; 41. Driving gear; 42. Large transmission gear; 43. Small transmission gear; 5. Filter. DETAILED DESCRIPTION

[0042] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0043] Embodiment 1

[0044] like Figure 1-4 As shown, the fresh air fan with bypass function comprises a rectangular outer shell 1 and an inner shell 2 and a full heat exchange module 221, the inner shell 2 is arranged in the outer shell 1, and the connection between the four outer peripheral surfaces of the inner shell 2 and the inner wall of the outer shell 1 is fixedly connected by a connecting plate 16, the front side of the outer shell 1 is provided with a fresh air inlet 111 and a return air outlet 141, and the rear side is provided with a fresh air outlet 121 and a return air inlet 131, the fresh air inlet 111 and the fresh air outlet 121 are staggered, the inner shell 2 is divided into a bypass chamber 21 and a heat exchange chamber 22 by a partition, and the full heat exchange module 221 is installed in the heat exchange chamber 22. The bypass body 3 is rotatably installed in the cavity 22 and the bypass cavity 21, and vents 211 are provided on the outer peripheral surface of the inner shell 2 corresponding to the fresh air inlet 111 and the fresh air outlet 121, and the vents 211 are connected with the bypass cavity 21, and a fresh air channel 31 is provided in the bypass body 3, and a fresh air heat exchange valve 112 is provided in the outer shell 1, and the fresh air heat exchange valve 112 is provided between the full heat exchange module 221 and the fresh air inlet 111, and the fresh air heat exchange valve 112 is used to control whether fresh air enters the full heat exchange module 221, and the bypass body 3 is rotated to control whether the fresh air channel 31 is connected or closed with the vents 211.

[0045] The fresh air blower is provided with a bypass chamber 21 and a heat exchange chamber 22 in the inner shell 2. When heat exchange is required, the bypass body 3 in the bypass chamber 21 controls the fresh air passage 31 to be closed, the fresh air heat exchange valve 112 to be opened, and the fresh air and the return air flow through the full heat exchange module 221 in the heat exchange chamber 22, thereby realizing heat exchange; when heat exchange is not required, the bypass body 3 in the bypass chamber 21 rotates, controls the fresh air passage 31 to be opened, and the fresh air heat exchange valve 112 to be closed, and the fresh air flows through the fresh air passage 31 in the bypass body 3, and the return air continues to be discharged through the full heat exchange module 221, thereby realizing indoor and outdoor ventilation. The fresh air blower has a simple structure and is easy to operate. It can control whether heat exchange is required according to needs, which is conducive to reducing energy consumption and increasing the service life of the full heat exchange module 221.

[0046] Embodiment 2

[0047] like Figure 5-14 As shown, the fresh air fan with bypass function comprises a rectangular outer shell 1 and an inner shell 2 and a full heat exchange module 221, the inner shell 2 is arranged in the outer shell 1, and the connection between the four outer peripheral surfaces of the inner shell 2 and the inner wall of the outer shell 1 is fixedly connected by a connecting plate 16, the front side of the outer shell 1 is provided with a fresh air inlet 111 and a return air outlet 141, and the rear side is provided with a fresh air outlet 121 and a return air inlet 131, the fresh air inlet 111 and the fresh air outlet 121 are staggered, the inner shell 2 is divided into a bypass chamber 21 and a heat exchange chamber 22 by a partition, the full heat exchange module 221 is installed in the heat exchange chamber 22, and the bypass chamber 21 is rotatably provided with a bypass body 3 , ventilation holes 211 connected to the bypass chamber 21 are provided on the four outer peripheral surfaces of the inner shell 2, and a return air channel 32 and a fresh air channel 31 that are not connected to each other are provided in the bypass body 3. The projections of the return air channel 32 and the fresh air channel 31 on the horizontal plane are perpendicular to each other, and the return air channel 32 and the fresh air channel 31 are staggered in the vertical direction. The bypass body 3 is rotated to control the return air channel 32 and the fresh air channel 31 to be connected or closed to the ventilation holes 211. A return air heat exchange valve 132 is provided in the outer shell 1. The return air heat exchange valve 132 is arranged between the full heat exchange module 221 and the return air inlet 131. The return air heat exchange valve 132 is used to control whether the return air enters the full heat exchange module 221.

[0048] The present fresh air blower is provided with a bypass chamber 21 and a heat exchange chamber 22 in the inner shell 2. When heat exchange is required, the bypass body 3 in the bypass chamber 21 controls the fresh air passage 31 and the return air passage 32 to be closed, the fresh air heat exchange valve 112 and the return air heat exchange valve 132 to be opened, and the fresh air and the return air flow through the full heat exchange module 221 in the heat exchange chamber 22, thereby realizing heat exchange; when heat exchange is not required, the bypass body 3 in the bypass chamber 21 rotates, controls the fresh air passage 31 and the return air passage 32 to be opened, the fresh air heat exchange valve 112 and the return air heat exchange valve 132 to be closed, and the fresh air and the return air flow through the fresh air passage 31 and the return air passage 32 in the bypass body 3, respectively, thereby realizing indoor and outdoor ventilation. The present fresh air blower has a simple structure and is easy to operate. It can control whether heat exchange is required according to needs, which is conducive to reducing energy consumption and increasing the service life of the full heat exchange module 221. Furthermore, the return air duct 32 and the fresh air duct 31, which are perpendicular to each other in the horizontal projection, are conveniently designed and have high stability during operation. The bypass function can be turned on or off by both forward and reverse rotation. The return air duct 32 and the fresh air duct 31 are staggered in the vertical direction to avoid mixing of return air and fresh air, which is beneficial to improving the ventilation effect.

[0049] Furthermore, the bypass cavity 21 and the bypass body 3 are both cylindrical, and the central angle α of the openings at both ends of the return air channel 32 and the openings at both ends of the fresh air channel 31 is less than or equal to 45°. When the return air channel 32 and the fresh air channel 31 are staggered from the vent 211, the openings at both ends of the return air channel 32 and the fresh air channel 31 can be completely blocked by the inner wall of the bypass cavity 21. The limitation of the opening amplitude at both ends of the fresh air channel 31 and the return air channel 32 can ensure that when bypass is not required, the fresh air channel 31 and the return air channel 32 can be completely closed, which is conducive to improving the stability of the fresh air blower during operation.

[0050] like Figure 5 and Figure 8As shown, a large transmission gear 42 is fixedly connected to the top of the bypass body 3, and the bypass body 3 can rotate synchronously with the large transmission gear 42. A driving motor 4 is fixedly connected to the outer circumferential surface of the inner shell 2, and a driving gear 41 is fixedly connected to the driving shaft of the driving motor 4. The driving gear 41 is directly meshed with the large transmission gear 42 or is connected to the large transmission gear 42 through a small transmission gear 43; the driving motor 4 is arranged in the fresh air inlet chamber 11 or the return air inlet chamber 13, and the driving motor 4 is fixed to the upper part of the outer side wall of the inner shell 2, and the driving motor 4 is staggered with the vent 211. The bypass body 3 is driven to rotate by means of multi-stage gears, and the transmission structure is stable. At the same time, the large transmission gear 42 connected to the bypass body 3 is much larger than the driving gear 41. Therefore, the angular velocity of the bypass body 3 is slower, and the rotation angle of the bypass body 3 can be more accurately controlled, which is beneficial to improving the control accuracy of the fresh air fan; since the fresh air outlet chamber 12 and the return air outlet chamber 14 in the fresh air fan are both provided with fans 15, the installation space in the above two air outlet chambers is limited. If the drive motor 4 is installed, it may affect the normal flow of air in the two air outlet chambers; and the fresh air inlet chamber 11 or the return air inlet chamber 13 is relatively empty, and the drive motor 4 installed in the above two air inlet chambers has little effect on the normal flow of air. At the same time, the drive motor 4 is fixed to the upper part of the outer wall of the inner shell 2 and is staggered with the vent 211 to minimize the influence of the drive motor 4 on the air circulation, which is beneficial to improving the stability of the fresh air fan during operation.

[0051] like Figure 2 or Figure 6 As shown, the inner shell 2, the outer shell 1 and the four connecting plates 16 together form a fresh air inlet chamber 11, a return air outlet chamber 14, a fresh air outlet chamber 12 and a return air inlet chamber 13. The fresh air inlet chamber 11 is respectively connected to the fresh air inlet 111 and a vent 211, the return air outlet chamber 14 is respectively connected to the return air outlet 141 and a vent 211, the fresh air outlet chamber 12 is respectively connected to the fresh air outlet 121 and a vent 211, the return air inlet chamber 13 is respectively connected to the return air inlet 131 and a vent 211, fans 15 are installed in the fresh air outlet chamber 12 and the return air outlet chamber 14, the fresh air heat exchange valve 112 is installed in the fresh air inlet chamber 11, and the return air heat exchange valve 132 is installed in the return air inlet chamber 13. The above-mentioned independent fresh air inlet chamber 11, return air outlet chamber 14, fresh air outlet chamber 12 and return air inlet chamber 13 design, combined with the fan 15 installed in the fresh air outlet chamber 12 and the return air outlet chamber 14, can make the flow of fresh air and return air smoother and improve the ventilation efficiency; the design of the fresh air heat exchange valve 112 and the return air heat exchange valve 132 can control whether the full heat exchange module 221 participates in the ventilation process, and has a simple structure, convenient control and high stability.

[0052] Furthermore, a filter 5 is provided in the fresh air inlet chamber 11 and the return air inlet chamber 13, and the filter 5 can block the fresh air inlet 111 and the return air inlet 131. The fresh air and the return air must pass through the corresponding filter 5 before they can enter the fresh air inlet chamber 11 or the return air inlet chamber 13. The design of the filter 5 can effectively filter impurities such as hair scraps and dust particles in the air, making the air fresher, and can also prevent impurities such as hair scraps and dust particles from entering the full heat exchange module 221 or the bypass body 3, which is beneficial to improving the service life of the full heat exchange module 221 and the working stability of the bypass body 3.

[0053] like Figure 1 and Figure 5 As shown, the outer shell 1 includes a frame 17, an upper cover 18 and a lower cover 19, the upper cover 18 and the lower cover 19 are both sealed and connected to the frame 17, the upper side and the lower side of the frame 17 are both provided with a sealing groove 171, and the upper cover 18 and the lower cover 19 are both provided with a sealing convex strip 100 that can be inserted into the sealing groove 171 on the side facing the frame 17. The connection structure of the upper cover 18, the frame 17 and the lower cover 19 can make the connection between the three more firm and have better sealing performance.

[0054] like Fig.14 As shown, a receiving groove 181 for accommodating the driving gear 41, the large transmission gear 42 and the small transmission gear 43 is provided on the lower side of the upper cover 18; an inspection port 191 is provided on the lower cover 19 for facilitating the replacement of the full heat exchange module 221, and an inspection cover 192 is detachably installed at the inspection port 191. The design of the receiving groove 181 enables the driving gear 41, the large transmission gear 42 and the small transmission gear 43 to rotate normally; the design of the inspection port 191 and the inspection cover 192 facilitates the replacement of the full heat exchange module 221 without disassembling the entire lower cover 19, which makes maintenance more convenient.

[0055] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope defined by the claims of the present invention.

Claims

1. A fresh air fan with a bypass function, comprising a rectangular outer shell (1), an inner shell (2) and a full heat exchange module (221), wherein the inner shell (2) is arranged in the outer shell (1), and the connection between the four outer peripheral surfaces of the inner shell (2) and the inner wall of the outer shell (1) is fixedly connected via a connecting plate (16), a fresh air inlet (111) and a return air outlet (141) are arranged on the front side of the outer shell (1), and a fresh air outlet (121) and a return air inlet (131) are arranged on the rear side, and the fresh air inlet (111) and the fresh air outlet (121) are staggered, characterized in that: The inner shell (2) is divided into a bypass chamber (21) and a heat exchange chamber (22) by a partition, the full heat exchange module (221) is installed in the heat exchange chamber (22), a bypass body (3) is rotatably installed in the bypass chamber (21), and ventilation holes (211) are provided on the outer peripheral surface of the inner shell (2) corresponding to the fresh air inlet (111) and the fresh air outlet (121), and the ventilation holes (211) are communicated with the bypass chamber (21). The bypass body (3) is provided with a fresh air passage (31), the outer shell (1) is provided with a fresh air heat exchange valve (112), the fresh air heat exchange valve (112) is provided between the full heat exchange module (221) and the fresh air inlet (111), the fresh air heat exchange valve (112) is used to control whether fresh air is allowed to enter the full heat exchange module (221), and the bypass body (3) is rotated to control the fresh air passage (31) and the ventilation port (211) to be connected or closed.

2. A fresh air blower with bypass function according to claim 1, characterized in that: The four outer peripheral surfaces of the inner shell (2) are each provided with a vent (211) connected to the bypass chamber (21); the bypass body (3) is provided with a return air channel (32) and a fresh air channel (31) that are not connected to each other; the projections of the return air channel (32) and the fresh air channel (31) on a horizontal plane are perpendicular to each other; the return air channel (32) and the fresh air channel (31) are staggered in a vertical direction; the bypass body (3) is rotated to control the return air channel (32) and the fresh air channel (31) to be connected to or closed from the vent (211); the outer shell (1) is provided with a return air heat exchange valve (132); the return air heat exchange valve (132) is provided between the full heat exchange module (221) and the return air inlet (131); the return air heat exchange valve (132) is used to control whether the return air is allowed to enter the full heat exchange module (221).

3. A fresh air blower with bypass function according to claim 2, characterized in that: The bypass chamber (21) and the bypass body (3) are both cylindrical, and the central angle α between the openings at both ends of the return air channel (32) and the openings at both ends of the fresh air channel (31) is less than or equal to 45°. When the return air channel (32) and the fresh air channel (31) are staggered from the vent (211), the openings at both ends of the return air channel (32) and the fresh air channel (31) can be completely blocked by the inner wall of the bypass chamber (21).

4. A fresh air blower with bypass function according to any one of claims 1 to 3, characterized in that: A large transmission gear (42) is fixedly connected to the upper side of the bypass body (3), and the bypass body (3) can rotate synchronously with the large transmission gear (42). A driving motor (4) is fixedly connected to the outer peripheral surface of the inner shell (2), and a driving gear (41) is fixedly connected to the driving shaft of the driving motor (4). The driving gear (41) is directly meshed with the large transmission gear (42) or connected to the large transmission gear (42) via a small transmission gear (43).

5. The fresh air blower with bypass function according to claim 4, characterized in that: The drive motor (4) is fixed to the upper portion of the outer side wall of the inner shell (2), and the drive motor (4) and the vent (211) are staggered.

6. A fresh air blower with bypass function according to claim 2 or 3, characterized in that: The inner shell (2), the outer shell (1) and the four connecting plates (16) together form a fresh air inlet chamber (11), a return air outlet chamber (14), a fresh air outlet chamber (12) and a return air inlet chamber (13); the fresh air inlet chamber (11) is respectively connected to a fresh air inlet port (111) and a vent (211); the return air outlet chamber (14) is respectively connected to a return air outlet port (141) and a vent (211); the fresh air outlet chamber (11) is respectively connected to a fresh air inlet port (111) and a vent (211); 2) are respectively connected to the fresh air outlet (121) and a vent (211); the return air inlet chamber (13) is respectively connected to the return air inlet (131) and a vent (211); fans (15) are installed in both the fresh air outlet chamber (12) and the return air outlet chamber (14); the fresh air heat exchange valve (112) is installed in the fresh air inlet chamber (11); and the return air heat exchange valve (132) is installed in the return air inlet chamber (13).

7. The fresh air blower with bypass function according to claim 6, characterized in that: The fresh air inlet chamber (11) and the return air inlet chamber (13) are both provided with filter screens (5), and the filter screens (5) are capable of blocking the fresh air inlet (111) and the return air inlet (131). The fresh air and the return air must pass through the corresponding filter screens (5) before they can enter the fresh air inlet chamber (11) or the return air inlet chamber (13).

8. The fresh air blower with bypass function according to claim 6, characterized in that: The outer shell (1) comprises a frame (17), an upper cover (18) and a lower cover (19); the upper cover (18) and the lower cover (19) are both sealedly connected to the frame (17); the upper side and the lower side of the frame (17) are both provided with sealing grooves (171); and the sides of the upper cover (18) and the lower cover (19) facing the frame (17) are both provided with sealing convex strips (100) capable of being inserted into the sealing grooves (171).

9. The fresh air blower with bypass function according to claim 5, characterized in that: The outer shell (1) comprises a frame (17), an upper cover (18) and a lower cover (19); a receiving groove (181) for accommodating a driving gear (41), a large transmission gear (42) and a small transmission gear (43) is provided on the lower side of the upper cover (18); an inspection port (191) for facilitating replacement of the full heat exchange module (221) is provided on the lower cover (19); an inspection cover (192) is detachably mounted on the inspection port (191).

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