Fresh air device and air conditioning equipment comprising same

Abstract

The utility model relates to the technical field of air conditioning equipment, in particular to a fresh air device and the air conditioning equipment comprising the fresh air device, and aims to solve the problems that an internal and external circulation switching mechanism of an existing fresh air device is complex in structure and poor in sealing performance, and the reliability and the air inlet efficiency of the device are affected. In order to achieve the purpose, the fresh air device comprises a shell, an air inlet, an air outlet and an air outlet, the first air inlet is formed in the outdoor part of the shell and is communicated with the air duct and the outdoor space; the second air inlet is formed in the indoor part of the shell and is communicated with the air duct and the indoor space; the air outlet is formed in the indoor part of the shell and is communicated with the air duct and the indoor space; the fan is mounted in the air duct and can suck air from the first air inlet and / or the second air inlet and discharge the air from the air outlet; the movable air door is movably connected to the shell and can selectively close the first air inlet or the second air inlet through movement so as to achieve switching between the inner circulation mode and the outer circulation mode.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning equipment, and particularly provides a fresh air device and an air conditioning equipment including the fresh air device. Background Art

[0002] In recent years, many air conditioning equipments are equipped with fresh air devices, which can flexibly switch between two modes of internal circulation and external circulation. Through the external circulation mode, the fresh air function can be realized, so as to suck the fresh air outside into the room, realize the air exchange between the room and the outside, and thus can adjust the oxygen content in the room, make the air quality in the room reach the carbon-oxygen balance again, which is beneficial to the health of users and improves the user experience.

[0003] However, the internal and external circulation switching mechanism of the existing fresh air device has a complex structure and poor sealing performance, which affects the reliability and air intake efficiency of the device.

[0004] Therefore, a new technical solution is needed in this field to solve the above problems. Summary of the Utility Model

[0005] The utility model aims to solve the above technical problems, that is, to solve the problems that the internal and external circulation switching mechanism of the existing fresh air device has a complex structure and poor sealing performance, which affects the reliability and air intake efficiency of the device.

[0006] In a first aspect, the utility model provides a fresh air device, which includes: a housing, an air duct is formed inside the housing; a first air inlet, the first air inlet is arranged on the part of the housing located outdoors, and communicates the air duct with the outdoor space; a second air inlet, the second air inlet is arranged on the part of the housing located indoors, and communicates the air duct with the indoor space; an air outlet, the air outlet is arranged on the part of the housing located indoors, and communicates the air duct with the indoor space; a fan, the fan is installed in the air duct and can suck air from the first air inlet and / or the second air inlet and discharge it from the air outlet; a movable air door, the movable air door is movably connected to the housing and can selectively close the first air inlet or the second air inlet by moving, so as to realize the switching between the internal circulation mode and the external circulation mode.

[0007] In the preferred technical solution of the above fresh air device, the movable air door is slidably connected to the housing and can slide between the first air inlet and the second air inlet to selectively close the first air inlet or the second air inlet.

[0008] In the preferred technical solution of the above fresh air device, the first air inlet is arranged at the end of the air duct, the second air inlet is arranged on the side wall of the air duct, the movable air door includes a straight part and a bent part, the straight part is slidably connected to the housing to close or open the first air inlet, and the bent part can move along with the straight part to close or open the second air inlet. When the straight part closes the first air inlet, the bent part opens the second air inlet; when the straight part opens the first air inlet, the bent part closes the second air inlet.

[0009] In the preferred technical solution of the above fresh air device, a limiting structure is further arranged inside the second air inlet. When the straight part completely closes the first air inlet, the side of the bent part away from the second air inlet is hermetically attached to the inner wall of the air duct; when the straight part completely opens the first air inlet, the side of the bent part close to the second air inlet is hermetically attached to the limiting structure to completely close the second air inlet.

[0010] In the preferred technical solution of the above fresh air device, the fresh air device further includes a driving device, the driving device is installed on the housing, and the output end of the driving device is drivingly connected to the movable air door to drive the movable air door to slide relative to the housing.

[0011] In the preferred technical solution of the above fresh air device, the driving device includes a driving motor and a transmission mechanism. The driving motor is installed on the housing, the output end of the driving motor is drivingly connected to the input end of the transmission mechanism, and the output end of the transmission mechanism is drivingly connected to the movable air door.

[0012] In the preferred technical solution of the above fresh air device, the transmission mechanism includes a transmission gear and a rack. The transmission gear is pivotally connected to the housing and is drivingly connected to the output shaft of the driving motor. The rack is mechanically connected to or integrally provided with the movable air door, and the transmission gear meshes with the rack to drive the movable air door to slide.

[0013] In the preferred technical solution of the above fresh air device, a guiding member is arranged on the housing, the movable air door is slidably connected to the guiding member, and the guiding member can guide the movable air door to slide along the arrangement direction of the first air inlet and the second air inlet.

[0014] In the preferred technical solution of the above fresh air device, the fresh air device further includes a filtering device arranged at the first air inlet, and / or the fresh air device further includes a heat exchange device arranged in the air duct.

[0015] In a second aspect, the present utility model provides an air conditioning device, and the air conditioning device includes the above-mentioned fresh air device.

[0016] In the case of adopting the above technical solution, the fresh air device of the present utility model includes: a housing, an air duct is formed inside the housing; a first air inlet, the first air inlet is arranged on the part of the housing located outdoors, connecting the air duct with the outdoor space; a second air inlet, the second air inlet is arranged on the part of the housing located indoors, connecting the air duct with the indoor space; an air outlet, the air outlet is arranged on the part of the housing located indoors, connecting the air duct with the indoor space; a fan, the fan is installed in the air duct and can suck air from the first air inlet and / or the second air inlet and discharge it from the air outlet; a movable air door, the movable air door is movably connected to the housing and can selectively close the first air inlet or the second air inlet by moving, so as to realize the switching between the internal circulation mode and the external circulation mode. Through such a setting, the structure of the fresh air device is simplified, the first air inlet and the second air inlet can share a movable air door, the rapid switching between the internal circulation mode and the external circulation mode is realized, and the reliability and sealing performance of the movable air door are ensured, and the operation noise is reduced.

[0017] Further, the movable air door of the present utility model is slidably connected to the housing and can slide between the first air inlet and the second air inlet to selectively close the first air inlet or the second air inlet. Through such a setting, the air door structure with a sliding connection form is simple, the technology is mature and easy to process, ensuring the reliability and stability of the air door operation and reducing the production cost.

[0018] Still further, the first air inlet of the present utility model is arranged at the end of the air duct, the second air inlet is arranged on the side wall of the air duct, the movable air door includes a straight part and a bent part, the straight part is slidably connected to the housing to close or open the first air inlet, and the bent part can move along with the straight part to close or open the second air inlet. When the straight part closes the first air inlet, the bent part opens the second air inlet, and when the straight part opens the first air inlet, the bent part closes the second air inlet. Through such a setting, the first air inlet and the second air inlet adopt such a position distribution. On the one hand, the space on the housing can be fully utilized, the space utilization rate is improved, the overall structure of the fresh air device is more compact, which is beneficial to the miniaturization of the equipment; on the other hand, the distance between the first air inlet and the second air inlet is controlled, which is beneficial to the miniaturization of the movable air door when the two share a movable air door.

[0019] Furthermore, a limiting structure is also provided inside the second air inlet of the present utility model. When the straight part completely closes the first air inlet, the surface of the bent part away from the second air inlet is in sealing fit with the inner wall of the air duct; when the straight part completely opens the first air inlet, the surface of the bent part close to the second air inlet is in sealing fit with the limiting structure to completely close the second air inlet. Through such a setting, on the one hand, the extreme positions of the movable air door can be limited from both ends; on the other hand, the sealing performance of the movable air door to the first air inlet and the second air inlet can be improved, ensuring the airtightness of the air duct in the internal circulation mode or the external circulation mode, contributing to improving the air intake efficiency, and at the same time preventing mutual interference between the internal circulation and the external circulation, ensuring the independence of the two modes.

[0020] Furthermore, the fresh air device of the present utility model further includes a driving device. The driving device is installed on the housing, and the output end of the driving device is drivingly connected to the movable air door to drive the movable air door to slide relative to the housing. Through such a setting, there is no need to manually drive the movable air door to move, realizing the automatic operation of the movable air door and improving the automation degree of the fresh air device.

[0021] Furthermore, the driving device of the present utility model includes a driving motor and a transmission mechanism. The driving motor is installed on the housing, the output end of the driving motor is drivingly connected to the input end of the transmission mechanism, and the output end of the transmission mechanism is drivingly connected to the movable air door. Through such a setting, on the one hand, the transmission mechanism can convert the rotational motion on the driving motor into the linear motion of the movable air door, realizing the reciprocating motion of the movable air door; on the other hand, the transmission distance and transmission direction of the power can be adjusted, facilitating the flexible adjustment of the position distribution of the driving device on the housing and making the overall structure more reasonable.

[0022] Furthermore, the transmission mechanism of the present utility model includes a transmission gear and a rack. The transmission gear is pivotally connected to the housing and is drivingly connected to the output shaft of the driving motor. The rack is mechanically connected or integrally provided with the movable air door, and the transmission gear meshes with the rack to drive the movable air door to slide. Through such a setting, the structure of the driving device is simple and the technology is mature, improving the stability and reliability of power transmission, reducing the transmission noise, and at the same time facilitating cost control.

[0023] Furthermore, a guiding member is provided on the housing of the present utility model. The movable air door is slidably connected to the guiding member, and the guiding member can guide the movable air door to slide along the arrangement direction of the first air inlet and the second air inlet. Through such a setting, the sliding direction of the movable air door can be limited, improving the stability and smoothness of the movable air door during the sliding process and reducing the operation noise.

[0024] Furthermore, the fresh air device of the present utility model further includes a filtering device disposed at the first air inlet, and / or the fresh air device further includes a heat exchange device disposed in the air duct. Through such an arrangement, the filtering device can filter impurities in the fresh air flow to prevent impurities from entering the air duct and the room; the heat exchange device can adjust the temperature and dehumidify the air flowing through the air duct, or reduce the temperature difference between the fresh air flow and the indoor air, thereby improving the comfort level in the two circulation modes.

[0025] In addition, the air conditioning equipment further provided by the present utility model based on the above fresh air device has the technical effects of the above fresh air device due to the adoption of the above fresh air device. Compared with the air conditioning equipment before improvement, the air intake efficiency and reliability of the air conditioning equipment of the present utility model are higher, the operation is more stable and quiet, which helps to improve the user experience. Description of the Drawings

[0026] The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings, in which:

[0027] Figure 1 is a schematic structural view of the fresh air device of the present utility model Figure 1 ;

[0028] Figure 2 is Figure 1 a partial enlarged view in

[0029] Figure 3 is a schematic structural view of the fresh air device of the present utility model Figure 2 ;

[0030] Figure 4 is Figure 3 a partial enlarged view in

[0031] Figure 5 is an assembly schematic diagram of the movable air door and the driving device of the present utility model;

[0032] Figure 6 is an internal structural schematic diagram of the air duct of the present utility model;

[0033] Figure 7 is Figure 6 a partial enlarged view in

[0034] List of reference signs:

[0035] 1. Housing; 11. First air inlet; 12. Second air inlet; 121. Limiting structure; 13. Air outlet; 2. Fan; 3. Movable air door; 31. Straight part; 32. Bent part; 4. Driving device; 41. Driving motor; 42. Transmission gear; 43. Rack; 5. Guide member. Detailed Embodiments

[0036] The preferred embodiments of the present utility model will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present utility model and are not intended to limit the protection scope of the present utility model.

[0037] It should be noted that in the description of the present utility model, terms indicating directions or positional relationships such as "inner" and "outer" are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0038] In addition, it should also be noted that in the description of the present utility model, unless otherwise clearly specified and defined, the terms "arranged", "connected" and "installed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0039] Based on the problems pointed out in the background art that the internal and external circulation switching mechanism of the existing fresh air device has a complex structure and poor sealing performance, affecting the reliability and air intake efficiency of the fresh air device. The present utility model provides a fresh air device and an air conditioning equipment including the fresh air device. By providing a movable air door slidably connected to the housing, the first air inlet or the second air inlet is selectively closed by the sliding of the movable air door. Among them, the first air inlet communicates with the outside, and the second air inlet communicates with the inside, realizing the switching between the internal circulation mode and the external circulation mode, simplifying the overall structure and improving the reliability. At the same time, the straight part and the bent part on the movable air door can be hermetically fitted with the edges of the first air inlet and the second air inlet respectively, improving the air tightness of the air duct in different modes, and further improving the air intake efficiency.

[0040] Specifically, as Figures 1 to 7As shown in the figure, the fresh air device of the present utility model includes: a housing 1, an air duct is formed inside the housing 1; a first air inlet 11, the first air inlet 11 is arranged on the part of the housing 1 located outdoors, connecting the air duct with the outdoor space; a second air inlet 12, the second air inlet 12 is arranged on the part of the housing 1 located indoors, connecting the air duct with the indoor space; an air outlet 13, the air outlet 13 is arranged on the part of the housing 1 located indoors, connecting the air duct with the indoor space; a fan 2, the fan 2 is installed in the air duct, capable of sucking air from the first air inlet 11 and / or the second air inlet 12 and discharging it from the air outlet 13; a movable air damper 3, the movable air damper 3 is movably connected to the housing 1, and can selectively close the first air inlet 11 or the second air inlet 12 by moving to realize the switching between the internal circulation mode and the external circulation mode.

[0041] Exemplarily, in practical applications, the fresh air device can be installed at positions such as on the wall or window between the indoor and outdoor, so that a part of the air duct is located indoors and another part is located outdoors, capable of connecting the indoor space with the outdoor space.

[0042] When operating in the internal circulation mode, the movable air damper 3 moves to the first air inlet 11 to close the first air inlet 11, making the second air inlet 12 communicate with the air outlet 13. At this time, under the action of the fan 2, the indoor air can enter the air duct from the second air inlet 12 and then be discharged into the indoor space from the air outlet 13, thereby forming a circulating air flow between the indoor space and the air duct. In some embodiments, a heat exchange device, a dehumidifying device, a sterilizing device, etc. can be installed in the air duct to adjust the temperature and humidity, disinfect and sterilize the circulating air flow, etc.

[0043] When operating in the external circulation mode, the movable air damper 3 moves from the first air inlet 11 to the second air inlet 12 to close the second air inlet 12, making the first air inlet 11 communicate with the air outlet 13. At this time, under the action of the fan 2, the outdoor air can enter the air duct from the first air inlet 11 and then be discharged into the indoor space from the air outlet 13, thereby introducing the fresh outdoor air into the indoor, completing the air exchange between the indoor and outdoor, increasing the oxygen content in the indoor air, and being beneficial to the health of users.

[0044] When the movable air damper 3 closes the first air inlet 11 or the second air inlet 12, it can be hermetically fitted with the edge of the first air inlet 11 or the second air inlet 12 to improve the sealing performance.

[0045] Such a setting not only simplifies the structure of the fresh air device, enables the first air inlet 11 and the second air inlet 12 to share a movable air damper 3, realizes the rapid switching between the internal circulation mode and the external circulation mode, but also ensures the reliability and sealing performance of the movable air damper 3, and reduces the operating noise.

[0046] Preferably, as Figures 1 to 4As shown in the figure, the movable air damper 3 of the present utility model is slidably connected to the housing 1 and can slide between the first air inlet 11 and the second air inlet 12 to selectively close the first air inlet 11 or the second air inlet 12.

[0047] Exemplarily, the movable air damper 3 can reciprocally slide along the arrangement direction of the first air inlet 11 and the second air inlet 12. When it slides to the position of the first air inlet 11, it just separates from the second air inlet 12. When it slides to the position of the second air inlet 12, it just separates from the first air inlet 11. The form of using a sliding connection for the movable air damper 3 simplifies the structure of the air damper, ensures the maturity of the technology, and is easy to process, making the operation of the air damper more stable and reliable, which is beneficial to the control of production costs.

[0048] It should be noted that in practical applications, those skilled in the art can also flexibly set the movable air damper 3 to be rotary, flip-type, etc., as long as it can selectively close one of the two air dampers. Such flexible adjustments and changes do not deviate from the principle and scope of the present utility model and should be limited within the protection scope of the present utility model.

[0049] Preferably, as Figures 1 to 7 shown, the first air inlet 11 of the present utility model is arranged at the end of the air duct, the second air inlet 12 is arranged on the side wall of the air duct. The movable air damper 3 includes a straight portion 31 and a bent portion 32. The straight portion 31 is slidably connected to the housing 1 to close or open the first air inlet 11. The bent portion 32 can move along with the straight portion 31 to close or open the second air inlet 12. When the straight portion 31 closes the first air inlet 11, the bent portion 32 opens the second air inlet 12. When the straight portion 31 opens the first air inlet 11, the bent portion 32 closes the second air inlet 12.

[0050] Exemplarily, the air duct of the present utility model is arranged as a tubular structure or a box-type structure. The first air inlet 11 is arranged at one end of the air duct located outdoors, the second air inlet 12 is arranged at a part of the side wall of the air duct located indoors, and the second air inlet 12 is arranged near the first air inlet 11. The opening direction of the first air inlet 11 and the opening direction of the second air inlet 12 form a certain included angle, denoted as the first angle. Preferably, the straight portion 31 of the movable air damper 3 slides in a plane perpendicular to the air duct and can close the first air inlet 11. The bent portion 32 extends along the straight portion 31 towards the indoor direction, and the included angle between the bent portion 32 and the straight portion 31 is the same as the first angle. The outer contour of the bent portion 32 is adapted to the second air inlet 12 and can close the second air inlet 12.

[0051] The first air inlet 11 and the second air inlet 12 are arranged in such a position distribution that, on the one hand, it can make full use of the space on the housing 1, improve the space utilization rate of the housing 1, make the overall structure of the fresh air device more compact, and is conducive to the miniaturization of the equipment; on the other hand, by controlling the distance between the first air inlet 11 and the second air inlet 12, on the premise that they share a movable air damper 3, it is convenient for the miniaturization of the movable air damper 3.

[0052] Preferably, as Figure 6 and Figure 7 shown, a limiting structure 121 is further arranged inside the second air inlet 12 of the present utility model. When the straight part 31 completely closes the first air inlet 11, the surface of the bent part 32 away from the second air inlet 12 is hermetically attached to the inner wall of the air duct; when the straight part 31 completely opens the first air inlet 11, the surface of the bent part 32 close to the second air inlet 12 is hermetically attached to the limiting structure 121 to completely close the second air inlet 12.

[0053] The limiting structure 121 is set as a sealing edge strip inside the second air inlet 12. Besides being able to limit the bent part 32 at the second air inlet 12, it can also improve the sealing performance between the bent part 32 and the second air inlet 12.

[0054] The surface of the bent part 32 away from the second air inlet 12 is adapted to the inner wall of the air duct, and can achieve their close fitting. When the straight part 31 moves to completely close the first air inlet 11, the surface of the bent part 32 away from the second air inlet 12 can be closely attached to the inner wall on the side opposite to the second air inlet 12, improving their sealing performance. Thus, when the internal circulation mode is executed, it can prevent outdoor air from flowing into the air duct through the gap between them, and further can effectively prevent outdoor pollutants from entering the room in the case of poor outdoor air quality.

[0055] Therefore, the cooperation between the bent part 32 and the limiting structure 121, and the cooperation between the bent part 32 and the inner wall can limit the extreme positions of the movable air damper 3 from both ends; it can also improve the sealing performance of the movable air damper 3 to the first air inlet 11 or the second air inlet 12, ensure the airtightness of the air duct when the internal circulation mode or the external circulation mode is executed, contribute to improving the air intake efficiency, and at the same time can prevent the mutual interference between the internal circulation and the external circulation, ensuring the independence of the two circulation modes.

[0056] Preferably, as Figures 1 to 4 shown, the fresh air device of the present utility model further includes a driving device 4. The driving device 4 is installed on the housing 1, and the output end of the driving device 4 is drivingly connected to the movable air damper 3 to drive the movable air damper 3 to slide relative to the housing 1.

[0057] Therefore, there is no need to manually drive the movable air door 3 to move, realizing the automatic control of the movable air door 3 and improving the automation degree of the fresh air device.

[0058] It should be noted that in practical applications, those skilled in the art can flexibly set the driving device 4 as a combination of a driving motor 41 and a transmission mechanism, or can also be set as a cylinder, etc., as long as it can drive the movable air door 3 to reciprocate. Such flexible adjustments and changes do not deviate from the principle and scope of the present invention and should all be limited within the protection scope of the present invention.

[0059] Preferably, as Figures 1 to 4 shown, the driving device 4 of the present invention includes a driving motor 41 and a transmission mechanism. The driving motor 41 is installed on the housing 1, the output end of the driving motor 41 is drivingly connected to the input end of the transmission mechanism, and the output end of the transmission mechanism is drivingly connected to the movable air door 3.

[0060] The transmission mechanism can convert the rotational motion on the driving motor 41 into the linear motion of the movable air door 3 to realize the reciprocating motion of the movable air door 3; at the same time, it can also adjust the transmission distance and transmission direction of the power, facilitating the flexible adjustment of the position distribution of the driving device 4 on the housing 1.

[0061] It should be noted that in practical applications, those skilled in the art can flexibly set the transmission mechanism as a gear-rack mechanism, a lead screw-nut mechanism, etc., as long as it can convert the rotational motion of the driving motor 41 into the linear motion of the movable air door 3. Such flexible adjustments and changes do not deviate from the principle and scope of the present invention and should all be limited within the protection scope of the present invention.

[0062] Preferably, as Figures 1 to 4 shown, the transmission mechanism of the present invention includes a transmission gear 42 and a rack 43. The transmission gear 42 is pivotally connected to the housing 1 and is drivingly connected to the output shaft of the driving motor 41. The rack 43 is mechanically connected or integrally provided with the movable air door 3, and the transmission gear 42 meshes with the rack 43 to drive the movable air door 3 to slide.

[0063] The gear-rack 43 mechanism makes the structure of the driving device 4 simple and the technology mature, improves the stability and reliability of power transmission, reduces the transmission noise, and is convenient for cost control at the same time.

[0064] Preferably, as Figures 1 to 4 shown, a guiding member 5 is provided on the housing 1 of the present invention. The movable air door 3 is slidably connected to the guiding member 5, and the guiding member 5 can guide the movable air door 3 to slide along the arrangement direction of the first air inlet 11 and the second air inlet 12.

[0065] Exemplarily, the guiding member 5 is arranged as a guide rail, and the movable air door 3 is installed in the guide rail and can slide freely in the guide rail. The guide rail can limit the sliding direction of the movable air door 3, improving the stability and smoothness during the sliding process of the movable air door 3 and reducing the running noise.

[0066] Preferably, the fresh air device of the present invention further includes a filtering device (not shown in the figure) provided at the first air inlet 11, and / or the fresh air device further includes a heat exchange device (not shown in the figure) provided in the air duct.

[0067] Through such an arrangement, impurities in the fresh air flow can be filtered to prevent the impurities from entering the air duct and the room; the heat exchange device can adjust the temperature and dehumidify the circulating air flow passing through the air duct, or reduce the temperature difference between the fresh air flow and the indoor air, improving the comfort level in the two circulation modes.

[0068] In addition, the air conditioning equipment further provided by the present invention based on the above fresh air device has the technical effects possessed by the above fresh air device due to the adoption of the above fresh air device. Compared with the air conditioning equipment before improvement, the air intake efficiency and reliability of the air conditioning equipment of the present invention are higher, the operation is more stable and quiet, which helps to improve the user experience.

[0069] So far, the technical solution of the present invention has been described in combination with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A fresh air device, characterized in that, The fresh air device includes: A housing, within which an air duct is formed; A first air inlet, which is arranged on the part of the housing located outdoors and connects the air duct with the outdoor space; A second air inlet, which is arranged on the part of the housing located indoors and connects the air duct with the indoor space; An air outlet, which is arranged on the part of the housing located indoors and connects the air duct with the indoor space; A fan, which is installed in the air duct and can suck air from the first air inlet and / or the second air inlet and discharge it from the air outlet; A movable air damper, which is movably connected to the housing and can selectively close the first air inlet or the second air inlet by moving, so as to realize the switching between the internal circulation mode and the external circulation mode.

2. The fresh air device according to claim 1, wherein The movable air damper is slidably connected to the housing and can slide between the first air inlet and the second air inlet to selectively close the first air inlet or the second air inlet.

3. The fresh air device according to claim 2, wherein, The first air inlet is arranged at the end of the air duct, and the second air inlet is arranged on the side wall of the air duct. The movable air damper includes a straight part and a bent part. The straight part is slidably connected to the housing to close or open the first air inlet, and the bent part can move along with the straight part to close or open the second air inlet. When the straight part closes the first air inlet, the bent part opens the second air inlet; when the straight part opens the first air inlet, the bent part closes the second air inlet.

4. The fresh air device according to claim 3, characterized in that, A limiting structure is further arranged inside the second air inlet. When the straight part completely closes the first air inlet, the side of the bent part away from the second air inlet is hermetically attached to the inner wall of the air duct; when the straight part completely opens the first air inlet, the side of the bent part close to the second air inlet is hermetically attached to the limiting structure to completely close the second air inlet.

5. The fresh air device according to claim 2, characterized in that, The fresh air device further includes a driving device, which is installed on the housing. The output end of the driving device is drivingly connected to the movable air damper to drive the movable air damper to slide relative to the housing.

6. The fresh air device according to claim 5, wherein The driving device includes a driving motor and a transmission mechanism. The driving motor is installed on the housing, the output end of the driving motor is drivingly connected to the input end of the transmission mechanism, and the output end of the transmission mechanism is drivingly connected to the movable air damper.

7. The fresh air device according to claim 6, characterized in that, The transmission mechanism includes a transmission gear and a rack. The transmission gear is pivotally connected to the housing and is drivingly connected to the output shaft of the driving motor. The rack is mechanically connected or integrally provided with the movable air damper, and the transmission gear meshes with the rack to drive the movable air damper to slide.

8. The fresh air device according to claim 2, wherein A guiding member is arranged on the housing, and the movable air damper is slidably connected to the guiding member. The guiding member can guide the movable air damper to slide along the arrangement direction of the first air inlet and the second air inlet.

9. The fresh air device according to any one of claims 1 to 8, characterized in that The fresh air device further includes a filtering device disposed at the first air inlet, and / or the fresh air device further includes a heat exchange device disposed in the air duct.

10. An air conditioning device, characterized in that, The air conditioning equipment includes the fresh air device according to any one of claims 1 to 9.

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