Fresh air device and air conditioner

Abstract

The fresh air device comprises a base and a volute assembly, the base is provided with an air inlet channel and an exhaust channel communicating with the air inlet channel, and the exhaust channel is provided with an indoor exhaust port and an outdoor exhaust port; the volute assembly is arranged in the exhaust channel and comprises a volute shell and an exhaust wind wheel arranged in the volute shell, the volute shell is provided with a volute air outlet, and the volute shell can rotate relative to the base so that the volute air outlet can correspond to the indoor exhaust port or the outdoor exhaust port. According to the technical scheme, the base rotates to enable the air outlet of the volute to correspond to the indoor air outlet or the outdoor air outlet, so that the air volume is equivalent no matter in a fresh air mode or an air exhaust mode, the air exhaust capacity is improved under the condition that the air volume capacity of original fresh air is not reduced, and air exhaust has the same air volume capacity.

Description

Technical Field

[0001] The present invention relates to the field of fresh air equipment, and in particular to a fresh air device and an air conditioner. Background Art

[0002] At present, the fresh air device realizes gas exchange through the main volute and the fan arranged in the volute. Generally, priority is given to solving the fresh air volume. That is, the volute tongue of the volute is mainly on the side of the fresh air outlet to ensure the fresh air volume. However, when exhausting air to the outdoors, it will cause low exhaust capacity and small exhaust air volume. Summary of the invention

[0003] The main purpose of the present invention is to provide a fresh air device, which aims to improve the exhaust capacity without reducing the original fresh air volume capacity, so that the exhaust air also has the same air volume capacity.

[0004] To achieve the above object, the present invention provides a fresh air device, comprising: A base having an air inlet passage and an exhaust passage communicating with the air inlet passage, wherein the exhaust passage has an indoor exhaust port and an outdoor exhaust port; and A volute assembly is arranged in the exhaust passage, and the volute assembly includes a volute housing and an exhaust impeller arranged in the volute housing. The volute housing has a volute air outlet, and the volute housing can rotate relative to the base so that the volute air outlet corresponds to the indoor exhaust port or the outdoor exhaust port.

[0005] Optionally, the air inlet passage has an indoor air inlet and an outdoor air inlet, the indoor air inlet and the indoor air exhaust port are located on the same side of the base, and the outdoor air inlet and the outdoor air exhaust port are located on the same side of the base.

[0006] Optionally, the fresh air device further comprises a first cover plate rotatably connected to the base, and the first cover plate can close the indoor exhaust port or the indoor air inlet.

[0007] Optionally, the fresh air device further comprises a second cover plate rotatably connected to the base, and the second cover plate can close the outdoor exhaust port or the outdoor air inlet.

[0008] Optionally, the fresh air device includes a first air outlet state. In the first air outlet state, the volute air outlet corresponds to the indoor exhaust port, the first cover plate closes the indoor air inlet, and the second cover plate closes the outdoor exhaust port.

[0009] Optionally, a filter is provided in the air intake passage.

[0010] Optionally, the fresh air device includes a second air outlet state. In the second air outlet state, the volute air outlet corresponds to the indoor air outlet, and the second cover plate closes the outdoor air inlet.

[0011] Optionally, the fresh air device includes a third air outlet state. In the third air outlet state, the volute air outlet corresponds to the outdoor air outlet, and the second cover plate closes the outdoor air inlet.

[0012] Optionally, a sealing groove is provided on the outer periphery of the volute casing, a sealing ring is embedded in the sealing groove, and the volute casing and the cavity wall of the exhaust passage press against the sealing ring.

[0013] Optionally, a guide rail structure is provided between the volute casing and the base, and the volute casing can rotate relative to the base through the guide rail structure.

[0014] Optionally, the air intake passage and the exhaust passage are connected via an air intake grille.

[0015] Optionally, the fresh air device further includes a drive motor, which is drivingly connected to the volute casing and fixed to the base, and is used for driving the volute casing to rotate in the exhaust passage.

[0016] The present invention also provides an air conditioner, comprising the fresh air device as described above.

[0017] The technical solution of the present invention adopts a volute assembly including a volute housing and an exhaust impeller arranged in the volute housing, and the volute housing is arranged in the exhaust passage and can rotate relative to the base so that the volute air outlet corresponds to the indoor exhaust port or the outdoor exhaust port. The air outlet of the volute is arranged on the volute tongue, and the function of the volute tongue is to change the direction of air flow and increase the speed and pressure of the air flow. When the air flow passes through the volute tongue, the shape of the volute tongue guides the air flow to diffuse and accelerate, thereby providing a larger air volume and pressure. The air outlet of the volute corresponds to the indoor exhaust port or the outdoor exhaust port, so that the air volume is equivalent whether in the fresh air mode or the exhaust mode, thereby improving the exhaust capacity without reducing the original fresh air volume capacity, so that the exhaust also has the same air volume capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0019] Figure 1This is a structural schematic diagram of an embodiment of a fresh air device of the present invention; Figure 2 for Figure 1 A schematic diagram of the structure from another perspective; Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure at BB in the middle; Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure at DD in the middle; Figure 5 It is a structural schematic diagram from the indoor spatial perspective of the fresh air device in the first air outlet state; Figure 6 It is a structural schematic diagram from the outdoor space perspective of the fresh air device in the first air outlet state; Figure 7 It is a structural schematic diagram from the indoor spatial perspective of the fresh air device in the second air outlet state; Figure 8 It is a structural schematic diagram from the outdoor space perspective of the fresh air device in the second air outlet state; Fig. 9 It is a structural schematic diagram from the indoor spatial perspective of the fresh air device in the third air outlet state; Fig.10 It is a structural schematic diagram from the outdoor space perspective of the fresh air device in the third air outlet state; Fig.11 for Figure 1 A schematic structural diagram of an embodiment of the middle base portion.

[0020] Description of Figure Numbers: The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0025] At present, the fresh air device realizes gas exchange through the main volute and the fan arranged in the volute. Generally, priority is given to solving the fresh air volume. That is, the volute tongue of the volute is mainly on the side of the fresh air outlet to ensure the fresh air volume. However, when exhausting air to the outdoors, it will cause low exhaust capacity and small exhaust air volume.

[0026] To this end, the present invention proposes a fresh air device, which aims to improve the exhaust capacity without reducing the air volume capacity of the original fresh air, so that the exhaust air also has the same air volume capacity.

[0027] In one embodiment of the present invention, Figures 1 to 11 As shown, the fresh air device 100 includes a base 200 and a volute assembly 300, the base 200 has an air inlet channel 210 and an exhaust channel 220 connected to the air inlet channel 210, the exhaust channel 220 has an indoor exhaust port 221 and an outdoor exhaust port 222; the volute assembly 300 is arranged in the exhaust channel 220, the volute assembly 300 includes a volute shell 310, and an exhaust impeller 320 arranged in the volute shell 310, the volute shell 310 has a volute air outlet 311, and the volute shell 310 can rotate relative to the base 200, so that the volute air outlet 311 corresponds to the indoor exhaust port 221 or the outdoor exhaust port 222.

[0028] Reference Fig.11The base 200 includes two volute-shaped shells to form an air intake channel 210 and an exhaust channel 220. A connected air port is provided between the air intake channel 210 and the exhaust channel 220. Specifically, an air intake grille is provided at the air port to connect the air intake channel 210 and the exhaust channel 220. A volute tongue is provided in the air intake channel 210 and the exhaust channel 220 to improve the flow of air. The function of the volute tongue is to change the direction of air flow and increase the speed and pressure of the air flow. When the air flow passes through the volute tongue, the shape of the volute tongue guides the air flow to diffuse and accelerate, thereby providing a larger air volume and pressure.

[0029] In one embodiment, the exhaust channel 220 has an indoor exhaust port 221 and an outdoor exhaust port 222, and the air intake channel 210 has an indoor air intake port 211 and an outdoor air intake port 212, wherein the outdoor exhaust port 222 and the outdoor air intake port 212 share one outlet, and the above-mentioned inlet and outlet can also be closed by movable parts.

[0030] In another embodiment, the indoor exhaust port 221 and the indoor air inlet 211, the outdoor exhaust port 222 and the outdoor air inlet 212 are provided separately, and the above-mentioned inlets and outlets can also be closed by movable parts.

[0031] Specifically, the air inlet 210 has an indoor air inlet 211 and an outdoor air inlet 212. The indoor air inlet 211 and the indoor exhaust port 221 are connected to the indoor space, and the outdoor air inlet 212 and the outdoor exhaust port 222 are connected to the outdoor space. In other schemes, the air inlet 210 can be opened with a single air inlet for air intake, such as opening only the indoor air inlet 211. During the exhaust process, air is inhaled from the indoor air inlet 211, and the volute assembly 300 exhausts air from the outdoor exhaust port 222.

[0032] In this way, the fresh air device 100 has a fresh air mode, an internal circulation mode and an exhaust mode. A filter 500, such as a filter net, is provided in the fresh air device 100. The fresh air mode is used to introduce airflow from the outside for purification. The internal circulation mode is used to realize indoor air circulation purification. And the exhaust mode is used to exhaust indoor dirty air.

[0033] The fresh air device 100 is an independent air treatment system consisting of an air supply system and an exhaust system. It purifies outdoor air through a fresh air fan and introduces it into the room, and exhausts the indoor air through pipes. A "fresh air flow field" is formed indoors, thereby meeting the needs of indoor fresh air ventilation. While supplying air, the air entering the room is filtered, disinfected, sterilized, oxygenated, and preheated (in winter).

[0034] Specifically, because an exhaust impeller 320 is provided in the volute shell 310, the air volume of the airflow changed by the volute tongue at the air outlet of the volute shell 310 is the largest, and the volute shell 310 is arranged in the exhaust channel, and can be rotated relative to the base 200 so that the volute shell air outlet 311 corresponds to the indoor exhaust port 221 or the outdoor exhaust port 222. In this way, the air volume is equivalent regardless of whether it is in the fresh air mode or the exhaust mode, thereby improving the exhaust capacity without reducing the original fresh air volume capacity, so that the exhaust air also has the same air volume capacity.

[0035] The technical solution of the present invention adopts a volute assembly 300 including a volute housing 310 and an exhaust impeller 320 arranged in the volute housing 310, and the volute housing 310 is arranged in the exhaust passage, and can be rotated relative to the base 200 so that the volute air outlet 311 corresponds to the indoor exhaust port 221 or the outdoor exhaust port 222, and the air outlet of the volute is arranged on the volute tongue, and the function of the volute tongue is to change the direction of air flow and increase the speed and pressure of the air flow. When the air flow passes through the volute tongue, the shape of the volute tongue guides the air flow to diffuse and accelerate, thereby providing a larger air volume and pressure. The air outlet of the volute corresponds to the indoor exhaust port 221 or the outdoor exhaust port 222, so that the air volume is equivalent whether in the fresh air mode or the exhaust mode, thereby improving the exhaust capacity without reducing the original fresh air volume capacity, so that the exhaust also has the same air volume capacity.

[0036] In traditional solutions, to solve the problem that the exhaust volume of fresh air air conditioners is not as good as the intake volume, the design is usually optimized: the structure and size of the fresh air impeller and the volute are changed to improve the exhaust efficiency. For example, the size of the volute air outlet 311 is increased, the resistance of the impeller is reduced, etc., which requires redesigning various parameters and modifying and adjusting the design of the fresh air air conditioner, increasing the cost and construction difficulty. In addition, because the position of the volute tongue cannot be changed, the air volume of the fresh air cannot be equal to the air volume of the exhaust, and the improvement effect is not obvious.

[0037] Alternatively, an exhaust passage 220 is added: an exhaust passage 220 is added from indoor to outdoor, for example, by installing an exhaust duct to connect indoor and outdoor, so as to exhaust indoor air faster and more smoothly. This solution requires pipeline installation and wiring, and occupies a certain space. Even if the construction cost is not considered, it will be limited by the actual space problem.

[0038] Alternatively, increase the wind speed: by increasing the rotation speed of the fresh air impeller or using a more powerful fan, the exhaust wind speed can be increased, thereby increasing the exhaust volume. This increase in wind speed will increase noise and energy consumption. While the exhaust volume increases, the fresh air volume also increases more, and it is impossible to strike a balance between performance and comfort.

[0039] And the use of bidirectional wind wheel: the introduction of bidirectional wind wheel technology enables the fresh air wind wheel to inhale and exhaust air at the same time, thereby achieving a balance between the intake and exhaust volume, which requires additional research and development and cost expenditure.

[0040] Therefore, in this solution, the air outlet of the volute corresponds to the indoor exhaust port 221 or the outdoor exhaust port 222, so that the air volume is equivalent regardless of whether it is in the fresh air mode or the exhaust mode, thereby improving the exhaust capacity without reducing the original fresh air volume capacity, so that the exhaust also has the same air volume capacity. While ensuring that the original structure is changed to the minimum, a balance can be made between performance and comfort, thereby increasing the exhaust volume and reducing additional research and development and changes to the space layout.

[0041] Reference Figures 1 to 4 Specifically, the air inlet channel 210 has an indoor air inlet 211 and an outdoor air inlet 212 , the indoor air inlet 211 and the indoor exhaust port 221 are located on the same side of the base 200 , and the outdoor air inlet 212 and the outdoor exhaust port 222 are located on the same side of the base 200 .

[0042] When the indoor air is turbid and has an odor, the indoor air inlet 211 is used to suck the indoor air into the air inlet channel 210, and then enter the exhaust channel 220 through the air inlet grille 700. At this time, the volute assembly 300 rotates, and the volute air outlet 311 faces the outdoor exhaust port 222. In this way, the fresh air device 100 can discharge the indoor gas through the volute assembly 300 to reduce indoor odors. It can be used for decoration and some situations with strong odors.

[0043] It is introduced above that the fresh air device 100 has a fresh air mode, an internal circulation mode and an exhaust mode, and the switching of these three modes is achieved by blocking or opening each air outlet in the fresh air device 100, thereby obtaining different air flow paths.

[0044] Specifically, the fresh air device 100 further includes a first cover plate 330 rotatably connected to the base 200 , and the first cover plate 330 can close the indoor air outlet 221 or the indoor air inlet 211 .

[0045] Specifically, the fresh air device 100 further includes a second cover plate 340 rotatably connected to the base 200 , and the second cover plate 340 can close the outdoor exhaust port 222 or the outdoor air inlet 212 .

[0046] Reference Figure 5 and Figure 6Specifically, the fresh air device 100 includes a first air outlet state. In the first air outlet state, the volute air outlet 311 corresponds to the indoor exhaust port 221, the first cover plate 330 closes the indoor air inlet 211, and the second cover plate 340 closes the outdoor exhaust port 222.

[0047] Generally speaking, doors and windows should be closed when turning on the air conditioner, because only in this way can the temperature be adjusted quickly, and power consumption and electricity bills can be saved to a certain extent. But this will lead to a consequence: indoor air is not circulated. The longer the air conditioner is turned on, the easier it is for the quality of indoor air to decline. When the air outlet of the volute corresponds to the indoor exhaust port 221, it is a fresh air mode at this time, which is used to introduce airflow from the outside for purification. In the air inlet channel 210 of the base 200, the shell of the volute shell 310 will close the outdoor exhaust port 222. It does not matter whether the second cover plate 340 closes the outdoor exhaust port 222. Air will not enter from the outdoor exhaust port 222. The air enters the air inlet channel 210 from the outdoor air inlet 212 on the same side, and then enters the exhaust channel 220 through the air inlet grille 700. After being accelerated by the exhaust wind wheel 320, it is discharged from the indoor exhaust port 221. The first cover plate 330 closes the indoor air inlet 211 to prevent the entry of indoor air, thereby ensuring the fresh air mode, and the air flowing out of the indoor exhaust port 221 is external gas.

[0048] In this process, in order to ensure the quality of air, a filter 500 may be provided in the exhaust passage 220 or the intake passage 210 to purify the air inhaled and discharged by the air conditioner. Reference Figure 7 and Figure 8 Specifically, the fresh air device 100 includes a second air outlet state. In the second air outlet state, the volute air outlet 311 corresponds to the indoor air outlet 221 , and the second cover plate 340 closes the outdoor air inlet 212 .

[0049] When the volute air outlet 311 corresponds to the indoor exhaust port 221, the internal circulation mode is used to realize indoor air circulation purification. In the air inlet channel 210 of the base 200, the shell of the volute shell 310 will close the outdoor exhaust port 222, and the air will not enter from the outdoor exhaust port 222. The second cover plate 340 closes the outdoor air inlet 212 to prevent the outdoor air from entering the air inlet channel 210 from the outdoor air inlet 212 and entering the exhaust channel 220; the first cover plate 330 maintains a neutral position, that is, at the common edge position of the indoor air inlet 211 and the indoor exhaust port 221, the first cover plate 330 can be regarded as the edge of the indoor air inlet 211, and can also be regarded as the edge of the indoor exhaust port 221; the air enters the air inlet channel 210 from the indoor air inlet 211, and because of the setting of the volute tongue, the air intake can be increased, and then after passing through the filter 500, it enters the volute assembly 300 through the air intake grille, and finally is discharged from the indoor exhaust port 221.

[0050] Reference Fig. 9 and Fig.10 Specifically, the fresh air device 100 includes a third air outlet state. In the third air outlet state, the volute air outlet 311 corresponds to the outdoor air outlet 222 , and the second cover plate 340 closes the outdoor air inlet 212 .

[0051] When the volute air outlet 311 corresponds to the outdoor exhaust port 222, it is the exhaust mode, which is used to exhaust the dirty air in the room. On the side of the air inlet channel 210 of the base 200 where the volute assembly 300 is located, the volute air outlet 311 changes from corresponding to the indoor exhaust port 221 to corresponding to the outdoor exhaust port 222. In this process, the channel sensor can be used to control the driving device, or it can be achieved by setting a limit structure on the volute assembly 300 and the base 200. Specifically, after the volute housing 310 rotates in the exhaust channel 220 so that the volute air outlet 311 corresponds to the outdoor exhaust port 222, the indoor exhaust port 221 of the exhaust channel 220 is closed by the volute housing 310. At this time, it does not matter whether the first cover plate 330 closes the indoor exhaust port 221 again. Therefore, the indoor air can only enter the air inlet channel 210 through the indoor air inlet 211, and then enter the volute assembly 300 from the air inlet grille 700 and then flow out from the outdoor exhaust port 222. In this mode, The volute tongue of the air inlet channel 210 is generally arranged at the indoor air inlet 211. In fact, even if the outdoor outlet is opened, air will mainly flow in from the indoor air inlet 211. In order to reduce noise and improve air intake efficiency, the second cover plate 340 closes the outdoor air inlet 212, and the first cover plate 330 closes the indoor air outlet. In this way, in the exhaust mode, due to the rotation setting of the volute assembly 300, the exhaust volume and the fresh air volume are equivalent. In this way, especially when there is odor indoors, the odor problem is solved, and the exhaust capacity of this solution is better. Reference Figures 1 to 4, regarding the rotation of the volute housing 310 and the base 200.

[0052] A guide rail structure 600 is provided between the volute housing 310 and the base 200 , and the volute housing 310 can rotate relative to the base 200 through the guide rail structure 600 .

[0053] The fresh air device 100 further includes a driving motor 800 , which is drivingly connected to the volute casing 310 . The driving motor 800 is fixed to the base 200 , and is used to drive the volute casing 310 to rotate in the exhaust passage 220 .

[0054] In one embodiment, the base 200 is provided with a cover body in the exhaust passage. During installation, the cover body is first removed to expose the exhaust passage, and the volute assembly 300 is installed in the cover body. The air inlet of the volute assembly 300 corresponds to the air inlet grille, and the other side of the volute assembly 300 corresponding to the air inlet cooperates with the cover body through a circular slide groove and a slide rail. The cover body is closed so that the slide groove corresponds to the slide rail, and is connected to the volute assembly 300 through a driving motor 800 to realize the rotation of the volute housing 310 in the exhaust passage 220.

[0055] In another embodiment, the guide rail structure 600 may be a bearing, and the volute housing 310 and the exhaust passage 220 are rotationally connected via the bearing and driven by the drive motor 800 .

[0056] Furthermore, in order to avoid air leakage in the fresh air device 100 and affect the quality of the product, a sealing groove 350 is provided on the outer periphery of the volute shell 310, and a sealing ring 400 is embedded in the sealing groove 350. The volute shell 310 and the cavity wall of the exhaust channel 220 press against the sealing ring 400.

[0057] The air enters the volute assembly 300 from the air inlet passage through the air inlet grille and will not escape from the gap between the volute assembly 300 and the exhaust passage 220, thereby ensuring the air tightness of the device.

[0058] The present invention further provides an air conditioner, which includes the above-mentioned fresh air device 100. Since the fresh air device 100 has multiple functions such as fresh air mode, internal circulation mode, exhaust mode, etc., adding a fresh air device 100 to the air conditioner can diversify the functions of the air conditioner and meet user needs.

[0059] The air conditioner includes an indoor air conditioner and an outdoor air conditioner, and the fresh air device 100 is arranged on the indoor air conditioner, such as being installed on a chassis together with components such as a heat exchanger. The indoor air conditioner can be a vertical air conditioner or a window air conditioner.

[0060] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A fresh air device, characterized in that: include: A base having an air inlet channel and an exhaust channel connected to the air inlet channel, wherein the exhaust channel has an indoor exhaust port and an outdoor exhaust port; and A volute assembly is arranged in the exhaust passage, and the volute assembly includes a volute housing and an exhaust impeller arranged in the volute housing. The volute housing has a volute air outlet, and the volute housing can rotate relative to the base so that the volute air outlet corresponds to the indoor exhaust port or the outdoor exhaust port.

2. The fresh air device according to claim 1, characterized in that: The air inlet passage has an indoor air inlet and an outdoor air inlet. The indoor air inlet and the indoor air outlet are connected to an indoor space, and the outdoor air inlet and the outdoor air outlet are connected to an outdoor space.

3. The fresh air device according to claim 2, characterized in that: The fresh air device also includes a first cover plate rotatably connected to the base, and the first cover plate can close the indoor exhaust port or the indoor air inlet.

4. The fresh air device according to claim 3, characterized in that: The fresh air device also includes a second cover plate rotatably connected to the base, and the second cover plate can close the outdoor exhaust port or the outdoor air inlet.

5. The fresh air device according to claim 4, characterized in that: The fresh air device includes a first air outlet state. In the first air outlet state, the volute air outlet corresponds to the indoor air outlet, the first cover plate closes the indoor air inlet, and the second cover plate closes the outdoor air outlet.

6. The fresh air device according to claim 4, characterized in that: A filter is arranged in the air intake passage.

7. The fresh air device according to claim 6, characterized in that: The fresh air device includes a second air outlet state. In the second air outlet state, the volute air outlet corresponds to the indoor air outlet, and the second cover plate closes the outdoor air inlet.

8. The fresh air device according to claim 4, characterized in that: The fresh air device includes a third air outlet state. In the third air outlet state, the volute air outlet corresponds to the outdoor air outlet, and the second cover plate closes the outdoor air inlet.

9. The fresh air device according to claim 1, characterized in that: A sealing groove is provided on the outer periphery of the volute housing, a sealing ring is embedded in the sealing groove, and the volute housing and the cavity wall of the exhaust passage press against the sealing ring.

10. The fresh air device according to claim 1, characterized in that: A guide rail structure is provided between the volute housing and the base, and the volute housing can rotate relative to the base through the guide rail structure.

11. The fresh air device according to claim 1, characterized in that: The air intake passage and the air exhaust passage are connected via an air intake grille.

12. The fresh air device according to claim 1, characterized in that: The fresh air device also includes a driving motor, which is drivingly connected to the volute casing and fixed to the base. The driving motor is used to drive the volute casing to rotate in the exhaust passage.

13. An air conditioner, characterized in that: It comprises the fresh air device as claimed in any one of claims 1 to 12.

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