CN207146669U - Fresh air outdoor unit and air conditioner - Google Patents

Abstract

The utility model discloses a fresh air outdoor unit and an air conditioner, wherein the fresh air outdoor unit comprises: a casing, a heat exchange assembly and a fresh air assembly arranged in the casing, and a fresh air inlet and a fresh air outlet are respectively arranged on the casing; The heat exchange component includes air duct, cross-flow wind wheel and heat exchanger. The fresh air component includes a volute and a centrifugal wind wheel installed in the volute. The air inlet channel of the volute is connected with the fresh air inlet, and the air outlet channel of the volute Connect with the fresh air outlet. The fresh air outdoor unit of the utility model adds a fresh air component to the outdoor unit of the air conditioner, so that the utility model not only has the function of heat exchange, but also has the function of introducing fresh air into the room; more importantly, the utility model combines the fresh air component and The heat exchanging components are all arranged inside the shell of the fresh air outdoor unit, so that the structure of the air conditioner outdoor unit is more compact, so that the fresh air outdoor unit of the utility model has the characteristics of simple structure and small volume.

Description

Fresh air outdoor unit and air conditioner

technical field

The utility model relates to the technical field of air conditioning, in particular to a fresh air outdoor unit and an air conditioner.

Background technique

With the improvement of people's requirements for indoor air quality, various air-conditioning equipment with fresh air function appear on the market. Air-conditioning equipment with fresh air function can introduce fresh air into the room, increase the oxygen content of indoor air, and improve the quality of indoor air. , to avoid the problem of low indoor oxygen content caused by closing the windows for a long time. However, most of the existing air conditioners with the fresh air function have complex structures. Therefore, there is an urgent need for an air conditioner with a simple structure and the fresh air function on the market.

Utility model content

The main purpose of the utility model is to propose a fresh air outdoor unit, which aims at adding fresh air function to the outdoor unit of the air conditioner and keeping the structure of the outdoor unit of the air conditioner simple.

In order to achieve the above purpose, the fresh air outdoor unit proposed by the utility model includes: a housing, the housing is respectively provided with a heat exchange air inlet, a heat exchange air outlet, a fresh air inlet and a fresh air outlet; In the housing, the heat exchange assembly includes an air duct, a cross-flow wind wheel and a heat exchanger, the cross-flow wind wheel is installed on the air duct, and the heat exchanger is arranged between the cross-flow wind wheel and the Between the heat exchange air inlets, the outlet of the air duct communicates with the heat exchange air outlets; and the fresh air assembly is arranged in the housing, and the fresh air assembly includes a volute and a volute installed in the volute For the centrifugal wind wheel, the air inlet channel of the volute communicates with the fresh air inlet, and the air outlet channel of the volute communicates with the fresh air outlet.

Preferably, the housing includes: a base and an upper box cover, and the upper box cover includes: a top board, a panel respectively connected to the top board, a back board, a first side board and a second side board, and the board is connected to the top board The back board is opposite, the first side board is opposite to the second side board, and the lower edge of the panel, back board, first side board and second side board is away from the top board to enclose a The matching installation opening; the heat exchange assembly and the fresh air assembly are installed on the base, and the upper box cover is arranged on the heat exchange assembly and the fresh air assembly and connected to the base.

Preferably, the fresh air inlet is opened on the second side plate, and the fresh air outlet is opened on the back plate; the air inlet channel of the volute is set corresponding to the fresh air inlet, and the The air outlet channel of the volute is set corresponding to the fresh air outlet.

Preferably, the volute includes: a first end cover and a second end cover detachably connected to the first end cover, and a gap for the centrifugal wind is formed between the first end cover and the second end cover. The installation space where the wheel is installed, an air outlet channel communicating with the fresh air outlet is formed on the peripheral side wall of the first end cover, and the second end cover is far away from the end wall of the first end cover. An air inlet channel communicating with the fresh air inlet is formed.

Preferably, a filter assembly is provided on the air inlet channel of the volute.

Preferably, the heat exchanger includes a plurality of sub-heat exchangers connected in sequence, and the plurality of sub-heat exchangers are bent so that the heat exchanger is half-enclosed around the cross-flow rotor. the periphery of the surface.

Preferably, the heat exchange air inlet includes a first heat exchange air inlet opened on the back plate and a second heat exchange air inlet opened on the top plate; the plurality of sub-heat exchangers include: The back heat exchanger corresponding to the first heat exchange air inlet; and the top heat exchanger and the front side heat exchanger corresponding to the second heat exchange air inlet.

Preferably, the cross-flow wind wheel is horizontally installed on the air duct; the air duct includes: a lower enclosure plate, formed with a wind guide surface concave to the cross-flow wind wheel; The two ends of the lower wall; and the upper wall, which surround the lower wall and the two end plates to form an air guide channel, and the air guide channel communicates with the heat exchange air outlet.

Preferably, the heat exchange air outlet is opened on the panel, and the heat exchange air outlet is directly opposite to the outlet of the air guide channel.

Preferably, the two end plates are further extended upwards with a support plate, and the outline of the support plate is adapted to the shape of the heat exchanger so that the heat exchanger can be overlapped and fixed.

Preferably, the edges of the two supporting plates protrude along the direction away from each other to provide supporting edges for overlapping and fixing the heat exchanger.

Preferably, the air duct further includes an overlapping step, and the overlapping step extends backward from the top of the lower wall, and after the heat exchanger is installed and fixed with the air duct, the back heat exchange The bottom of the device overlaps the overlapping steps.

The utility model also proposes an air conditioner, including: an indoor unit and a fresh air outdoor unit, and the fresh air outdoor unit includes:

The housing is provided with a heat exchange air inlet, a heat exchange air outlet, a fresh air inlet and a fresh air outlet respectively; A flow wind wheel and a heat exchanger, the cross-flow wind wheel is installed on the air duct, the heat exchanger is arranged between the cross-flow wind wheel and the heat exchange air inlet, the outlet of the air duct is connected to the The heat exchange air outlet is connected; and the fresh air assembly is arranged in the housing, the fresh air assembly includes a volute and a centrifugal fan installed in the volute, the air inlet channel of the volute is connected to the fresh air The air inlet is connected, and the air outlet channel of the volute is connected with the fresh air outlet.

The fresh air outdoor unit of the utility model is equipped with a fresh air component on the basis of the outdoor unit of the air conditioner so that the utility model not only has the function of heat exchange, but also has the function of introducing fresh air into the room, so that the oxygen content of the indoor air can be increased , improve the quality of indoor air, and avoid the problem of low indoor oxygen content caused by closing windows for a long time. More importantly, the utility model arranges both the fresh air component and the heat exchange component inside the shell of the fresh air outdoor unit, which makes the structure of the air conditioner outdoor unit more compact, thus ensuring that the fresh air outdoor unit can still be equipped with fresh air components. Ensure the characteristics of simple structure and small size.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the present utility model, and those skilled in the art can also obtain other drawings according to the structures shown in these drawings without creative work.

Fig. 1 is a front structural schematic diagram of an embodiment of the fresh air outdoor unit of the present invention;

Fig. 2 is a rear view structural schematic diagram of the fresh air outdoor unit in Fig. 1;

Fig. 3 is a structural schematic diagram of the upper box cover of the fresh air outdoor unit in Fig. 1 after it is separated from the base;

Fig. 4 is a schematic diagram of an exploded structure of the fresh air module in Fig. 3;

Fig. 5 is a schematic diagram of an exploded structure of the heat exchange assembly in Fig. 3;

Fig. 6 is a schematic top view structural diagram of the fresh air outdoor unit in Fig. 1;

Fig. 7 is a schematic cross-sectional structure diagram along the VII-VII direction of Fig. 6;

Explanation of reference numbers:

label name label name 100 case 141 Second heat exchange air inlet 200 Heat exchange components 161 fresh air inlet 300 Fresh air components 211 lower panel 110 base 212 end plate 120 panel 213 Coaming 130 Backplane 214 support plate 140 roof 215 lap steps 150 first side panel 231 back heat exchanger 160 second side panel 232 top heat exchanger 210 air duct 233 front side heat exchanger 220 cross-flow rotor 311 first end cap 230 Heat Exchanger 312 second end cap 310 volute 214a Support edge 320 Centrifugal Wind Wheel 311a Outlet channel 121 heat exchange outlet 312a Air intake channel 131 The first heat exchange air inlet

The realization of the purpose of the utility model, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

It should be noted that if there is a directional indication (such as up, down, left, right, front, back...) in the embodiment of the present utility model, the directional indication is only used to explain the position in a certain posture (as shown in the accompanying drawing). (shown) the relative positional relationship, movement conditions, etc. between the various components, if the specific posture changes, the directional indication will also change accordingly.

In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. Implying their relative importance or implying the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , also not within the scope of protection required by the utility model.

The utility model provides a fresh air outdoor unit, which is provided with a fresh air component. In an embodiment of the present invention, as shown in Fig. 1 to Fig. 3, the fresh air outdoor unit includes: a casing 100, and a heat exchange assembly 200 and a fresh air assembly 300 disposed in the casing 100, wherein the casing The body 100 is respectively provided with a heat exchange air inlet, a heat exchange air outlet 121, a fresh air inlet 161 and a fresh air outlet (not shown in the figure). The air inlet 131 and the second heat exchange air inlet 141 on the top surface of the housing 100; the heat exchange assembly 200 includes an air duct 210, a cross-flow impeller 220 and a heat exchanger 230, and the cross-flow impeller 220 is installed on the wind On the channel 210, the heat exchanger 230 is arranged between the cross-flow wind wheel 220 and the heat exchange air inlet, and the outlet of the air channel 210 is connected with the heat exchange air outlet 121; the fresh air component 300 is set in the housing 100, the fresh air assembly 300 includes a volute 310 and a centrifugal fan 320 installed in the volute 310, the air inlet channel 312a of the volute 310 is connected to the fresh air inlet 161, and the air outlet passage 311a of the volute 310 is in communication with the fresh air outlet.

This patent adds a fresh air component 300 on the basis of the air conditioner outdoor unit. Therefore, the fresh air outdoor unit proposed by the utility model not only has the function of heat exchange, but also has the function of introducing fresh air into the room. In this way, the indoor air can be improved. Increase the oxygen content, improve the quality of indoor air, and avoid the problem of low indoor oxygen content caused by closing windows for a long time. What needs to be explained here is that since the air conditioner outdoor unit of this patent is suitable for cooling-only air conditioners, the heat exchanger 230 of the fresh air outdoor unit in this embodiment is a condenser; In an example, the heat exchanger 230 may also be an evaporator or an air conditioner including both a condenser and an evaporator to adapt to different functions.

More importantly, the utility model arranges the fresh air assembly 300 and the heat exchange assembly 200 inside the fresh air outdoor unit casing 100, making the structure of the air conditioner outdoor unit more compact, thereby ensuring that the fresh air outdoor unit is equipped with the fresh air assembly 300 At the same time, it can still guarantee the characteristics of simple structure and small size.

The installation structure of the fresh air outdoor unit will now be described in detail in conjunction with FIGS. 1 to 3 . The housing 100 of the fresh air outdoor unit includes: a base 110 and an upper box cover, and the upper box cover includes: a top plate 140 , a panel 120 , and a back plate 130 , the first side plate 150 and the second side plate 160, wherein, the panel 120, the back plate 130, the first side plate 150 and the second side plate 160 are respectively connected with the top plate 140 and extend downwards, the panel 120 and the back The boards 130 are arranged oppositely, the first side board 150 and the second side board 160 are arranged oppositely, and the front board 120 , the back board 130 , the first side board 150 and the second side board 160 are away from the lower edge of the top board 140 Close the installation opening adapted to the base 110; the heat exchange assembly 200 and the fresh air assembly 300 are installed on the base 110, and the upper box cover is arranged on the heat exchange assembly 200 and the fresh air assembly 300 and connected to the base 110.

Since the top plate 140, the panel 120, the back plate 130, the first side plate 150 and the second side plate 160 are integrally formed, and the heat exchange assembly 200 and the fresh air assembly 300 are both arranged in the installation space enclosed by the upper box cover and the base 110 Therefore, the installation process of the fresh air outdoor unit is simple and convenient. Specifically, first install the heat exchange assembly 200 and the fresh air assembly 300 on the base 110, and then close the upper box cover on the base 110 to complete the assembly of the fresh air outdoor unit.

Please refer to Figure 1 and Figure 2, in order to reduce the volume of the fresh air outdoor unit, in an embodiment of the present invention, the fresh air inlet 161 is opened on the second side plate 160, and the fresh air inlet 161 is opened on the back plate 130. There is the fresh air outlet; the air inlet channel 312a of the volute 310 is set correspondingly to the fresh air inlet 161 , and the air outlet channel 311a of the volute 310 is set correspondingly to the fresh air outlet. Since the air inlet passage 312a of the volute 310 is set corresponding to the fresh air inlet 161, and the air outlet passage 311a is arranged corresponding to the fresh air outlet, the lengths of the air inlet passage 312a and the air outlet passage 311a are both relatively short, so that the fresh air outdoor unit Keep the volume small.

Specifically, please refer to FIG. 4 , the volute 310 includes: a first end cover 311 and a second end cover 312 detachably connected with the first end cover 311 , the first end cover 311 and the second end cover 311 An installation space for the centrifugal fan 320 is formed between the covers 312, and an air outlet channel 311a communicating with the fresh air outlet is formed on the peripheral side wall of the first end cover 311. An air inlet passage 312 a communicating with the fresh air inlet 161 is formed on the end wall of the second end cover 312 away from the first end cover 311 . In an embodiment of the present utility model, the first end cover 311 and the second end cover 312 are fixedly connected by buckles, specifically, the first end cover 311 and the second end cover 312 both include a bottom wall and The peripheral sidewalls extending towards each other, the peripheral sidewalls of the first end cover 311 and the second end cover 312 are correspondingly provided with slots and plug-in blocks to realize the clamping and fixing of the two.

As a preferred mode, the plug-in block is arranged in a strip shape, and the plug-in block includes: an elastic arm and a protrusion fixedly connected with the elastic arm, the front end of the protrusion is provided with a guide surface, and the rear end of the protrusion is provided with a There are stop steps, so that the card protrusion can be conveniently inserted into the slot, and the bonding strength between the card protrusion and the insert block can be ensured conveniently after being clamped and fixed.

Please continue to refer to Fig. 4, considering that the outdoor air is easily mixed with dust particles, fine particles (PM2.5), heavy metal particles, microorganisms, etc., in order to improve the cleanliness of the fresh air introduced by the fresh air assembly 300 from the outside, in the utility model one implementation In an example, a filter assembly 313 is provided on the air inlet channel 312a of the volute 310 . The filter assembly 313 can be but not limited to a filter screen. By setting the filter assembly 313 on the air inlet channel 312a, harmful particles in the fresh air can be filtered out, and the cleanliness of the fresh air can be ensured while increasing the oxygen content of the indoor air, thereby ensuring the user of good health.

Please refer to Figure 3 and Figure 5, in order to further reduce the volume of the fresh air outdoor unit on the premise of ensuring that the heat exchanger 230 has a sufficient heat exchange area, in another embodiment of the utility model, the heat exchanger 230 includes multiple A number of sub-heat exchangers connected in sequence, and the plurality of sub-heat exchangers are bent so that the heat exchanger 230 is half surrounded by the periphery of the cross-flow fan wheel 220, so that when passing through When the flow wind wheel 220 rotates, the airflow flows in and out radially from the cross-flow wind wheel 220. Since the heat exchanger 230 is half-surrounded by the cross-flow wind wheel 220, multiple sub-heat exchangers can realize heat exchange, and the multiple sub- The space occupied by the heat exchanger is small, so that the fresh air outdoor unit has a small volume.

Specifically, the heat exchange air inlet includes a first heat exchange air inlet 131 opened on the back plate 130 and a second heat exchange air inlet 141 opened on the top plate 140; a plurality of the sub-heat exchangers 230 It includes: a back heat exchanger 231 corresponding to the first heat exchange air inlet 131 ; and a top heat exchanger 232 and a front side heat exchanger 233 corresponding to the second heat exchange air inlet 141 . Since the back heat exchanger 231 is arranged in parallel with the back plate 130 and is arranged corresponding to the first heat exchange air inlet 131, the top heat exchanger 232 and the front side heat exchanger 233 are arranged in parallel with the top plate 140 and are arranged in parallel with the second heat exchange inlet. The tuyeres 141 are provided correspondingly, so the airflow can pass through the heat exchanger 230 in an approximately vertical state, so that the airflow can pass through the heat exchanger 230 more easily, thereby improving the heat exchange effect of the heat exchanger 230 .

Please refer to Figure 5. In order to reduce the noise of the fresh air outdoor unit, the heat exchange component 200 of the fresh air outdoor unit of the present invention adopts a cross-flow wind wheel 220, and the noise of the cross-flow wind wheel 220 is much smaller than that of a centrifugal wind wheel or an axial flow wind wheel; In this embodiment, the cross-flow wind wheel 220 is horizontally installed on the air duct 210; the air duct 210 includes: a lower enclosure 211, two end panels 212 and an upper enclosure 213, wherein the lower enclosure 211 is formed with a wind guide surface concave to the cross-flow wind wheel 220; the two end plates 212 are respectively arranged at the two ends of the lower enclosure 211; the upper enclosure 213 is connected with the lower enclosure 211 and the two The end plate 212 surrounds and forms an air guide channel, and the air guide channel 311 a communicates with the heat exchange air outlet 121 .

As shown in Fig. 3, as a preferred manner, the heat exchange air outlet 121 is opened on the panel 120, and the heat exchange air outlet 121 is directly opposite to the outlet of the air guide channel, so that the heat exchange can be facilitated. The flow of hot air improves the heat exchange rate of the heat exchanger 230 .

Please refer to Figures 5 to 7, considering that the heat exchanger 230 is installed on the air duct 210, in order to make the heat exchanger 230 and the air duct 210 more stable after installation, in this embodiment, the two end plates 212 A support plate 214 is also extended upwards. The outline of the support plate 214 is adapted to the shape of the heat exchanger 230 so that the heat exchanger 230 can be overlapped and fixed. The support plate 214 provides the heat exchanger 230 with The upward lifting force is achieved, and the cross-sectional shape of the support plate 214 is adapted to the bending structure of the heat exchanger 230, therefore, the support plate 214 can better support the heat exchanger 230, so that the heat exchanger 230 is compatible with the wind Road 210 is more stable after installation.

As a preferred manner, the edges of the two support plates 214 are protruded along the direction away from each other to provide a support edge 214a for the heat exchanger 230 to overlap and fix, and the support edge 214a can increase the size of the support plate 214 and The contact area of the heat exchanger 230 can further improve the installation strength of the heat exchanger 230 and the air duct 210 .

Further, the air duct 210 also includes an overlapping step 215, specifically, the overlapping step 215 extends backward from the top of the lower wall 211, and the heat exchanger 230 and the air duct 210 After being installed and fixed, the bottom of the back heat exchanger 231 overlaps the overlapping step 215 . Since the overlapping step 215 provides support for the heat exchanger 230 , it can ensure the structural strength of the heat exchanger 230 and the air duct 210 after installation.

The utility model also proposes an air conditioner, the air conditioner includes an indoor unit and a fresh air outdoor unit, the specific structure of the fresh air outdoor unit refers to the above-mentioned embodiments, because the air conditioner of the utility model adopts all the technical solutions of all the above-mentioned embodiments , so at least it has all the beneficial effects brought by the technical solutions of the above embodiments, and will not be repeated here.

The above is only a preferred embodiment of the present utility model, and does not therefore limit the scope of the patent of the present utility model. Under the inventive concept of the present utility model, the equivalent structural transformation made by using the specification of the utility model and the contents of the accompanying drawings, or Direct/indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims (13)

1. A fresh air outdoor unit, characterized in that it comprises: A housing, the housing is respectively provided with a heat exchange air inlet, a heat exchange air outlet, a fresh air inlet and a fresh air outlet; The heat exchange assembly is arranged in the housing, the heat exchange assembly includes an air duct, a cross-flow fan wheel and a heat exchanger, the cross-flow wind wheel is installed on the air duct, and the heat exchanger is arranged on the through-flow fan Between the air flow wheel and the heat exchange air inlet, the outlet of the air duct communicates with the heat exchange air outlet; and The fresh air assembly is arranged in the housing, the fresh air assembly includes a volute and a centrifugal wind wheel installed in the volute, the air inlet passage of the volute communicates with the fresh air inlet, and the volute The air outlet channel of the shell communicates with the fresh air outlet. 2. The fresh air outdoor unit according to claim 1, wherein the housing comprises: a base and an upper cover, and the upper cover comprises: a top plate, a panel respectively connected to the top plate, a back plate, The first side panel and the second side panel, the panel is opposite to the back panel, the first side panel is opposite to the second side panel, the panel, the back panel, the first side panel and the second side panel are away from The lower edge of the top plate encloses an installation opening adapted to the base; The heat exchange assembly and the fresh air assembly are installed on the base, and the upper box cover is arranged on the heat exchange assembly and the fresh air assembly and connected to the base. 3. The fresh air outdoor unit according to claim 2, characterized in that, The fresh air inlet is opened on the second side plate, and the fresh air outlet is opened on the back plate; the air inlet channel of the volute is set corresponding to the fresh air inlet, and the volute The air outlet channel is set corresponding to the fresh air outlet. 4. The fresh air outdoor unit according to any one of claims 1-3, wherein the volute comprises: a first end cover and a second end cover detachably connected to the first end cover, the An installation space for the centrifugal wind wheel to be installed is formed between the first end cover and the second end cover, and an air outlet connected to the fresh air outlet is formed on the peripheral side wall of the first end cover. An air inlet channel communicating with the fresh air inlet is formed on the end wall of the second end cover away from the first end cover. 5. The fresh air outdoor unit according to any one of claims 1-3, wherein a filter assembly is provided on the air inlet channel of the volute. 6. The fresh air outdoor unit according to claim 2, wherein the heat exchanger comprises a plurality of sequentially connected sub-heat exchangers, and the plurality of sub-heat exchangers are bent so that The heat exchanger is half surrounded by the peripheral surface of the cross-flow wind rotor. 7. The fresh air outdoor unit according to claim 6, wherein the heat exchange air inlet includes a first heat exchange air inlet opened on the back plate and a second heat exchange air inlet opened on the top plate The multiple sub-heat exchangers include: a back heat exchanger corresponding to the first heat exchange air inlet; and a top heat exchanger and a front heat exchange corresponding to the second heat exchange air inlet device. 8. The fresh air outdoor unit according to claim 7, wherein the cross-flow wind wheel is horizontally installed in the air duct; the air duct includes: The lower wall is formed with a wind guide surface concave to the cross-flow wind wheel; two end plates, respectively provided at both ends of the lower wall; and The upper wall is surrounded by the lower wall and the two end plates to form an air guide channel, and the air guide channel is connected with the heat exchange air outlet. 9 . The fresh air outdoor unit according to claim 8 , wherein the heat exchange air outlet is opened on the panel, and the heat exchange air outlet is directly opposite to the outlet of the air guiding channel. 10 . 10. The fresh air outdoor unit according to claim 8, characterized in that, the two end plates are further extended upwards with a support plate, and the outline of the support plate is adapted to the shape of the heat exchanger for the heat exchanger. The heat exchanger is lapped and fixed. 11. The fresh air outdoor unit according to claim 10, characterized in that, the edges of the two support plates protrude along the direction away from each other to provide a supporting edge for the heat exchanger to overlap and fix. 12. The fresh air outdoor unit according to claim 8, wherein the air duct further comprises overlapping steps, the overlapping steps extend backward from the top of the lower wall, and the heat exchanger After being installed and fixed with the air duct, the bottom of the back heat exchanger overlaps the overlapping steps. 13. An air conditioner, characterized by comprising: an indoor unit and a fresh air outdoor unit according to any one of claims 1-12.