CN214223327U - Fresh air system - Google Patents

Abstract

The utility model discloses a new trend system, include: the air conditioner comprises a host, a centralized exhaust pipe and a negative pressure fan, wherein the host comprises a fresh air pipe and an exhaust pipe, the air inlet end of the fresh air pipe is communicated with outdoor atmosphere, the air outlet end of the fresh air pipe is communicated with indoor environment, and the air inlet end of the exhaust pipe is communicated with indoor environment; the centralized exhaust pipe is arranged outdoors and is communicated with the air outlet end of the exhaust pipe; the negative pressure fan is arranged outdoors and connected with the centralized exhaust pipe. Because the fresh air pipe is with outdoor fresh air energy source continuously from outdoor entering indoor, the exhaust pipe is with indoor air after the circulation to concentrate the blast pipe and handle, so, can realize the effective circulation of air among the whole new trend system, improve indoor air quality, simultaneously, because concentrate blast pipe and negative-pressure air fan all be used for arranging in outdoors, therefore can effectively reduce indoor occupation space and be favorable to staff's installation, maintenance.

Description

Fresh air system

Technical Field

The utility model belongs to the technical field of the building ventilation technique and specifically relates to a new trend system is related to.

Background

With the development of the social and economic level, the living standard of people is continuously improved, and the requirements of people on living quality are higher and higher. Particularly, with the emergence of more and more high-rise buildings and the increasing deterioration of air quality, most families or offices are provided with fresh air systems to improve or improve indoor air quality and ventilation degree, so as to meet the living demands of people.

The fresh air system generally comprises a fresh air fan and pipeline fittings, the fresh air fan purifies outdoor air and introduces the air into the room through an air inlet pipeline so as to improve indoor air quality, and meanwhile, an air outlet pipeline discharges the air after indoor circulation. Since viruses or bacteria may be contained in the air discharged from the room, the discharged air needs to be collected and then discharged to the atmosphere. However, in some buildings, the indoor space is very limited, and the pipes for collecting the harmful air are placed indoors, which not only occupies the precious space of the house, but also causes inconvenience in installation or maintenance.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need to provide a fresh air system that is easy to install and maintain and occupies less indoor space.

A fresh air system comprising: the air conditioner comprises a host, a fan and a fan, wherein the host comprises a fresh air pipe and an exhaust pipe, the air inlet end of the fresh air pipe is communicated with outdoor atmosphere, the air outlet end of the fresh air pipe is communicated with indoor environment, and the air inlet end of the exhaust pipe is communicated with indoor environment; the centralized exhaust pipe is arranged outdoors and is communicated with the air outlet end of the exhaust pipe; the negative pressure fan is arranged outdoors and connected with the centralized exhaust pipe.

In the fresh air system, the host machine comprises the fresh air pipe and the exhaust pipe, and the air inlet end of the fresh air pipe is arranged outdoors and communicated with the outdoor atmosphere, and the air outlet end of the fresh air pipe is arranged indoors and communicated with the indoor environment, so that outdoor fresh air energy continuously enters the indoor environment from the outdoor environment to improve the indoor air quality. Simultaneously, because the air inlet end of exhaust pipe is placed in indoor and is linked together with indoor environment, the air-out end of exhaust pipe is placed in outdoor and with be used for placing in outdoor the concentrated blast pipe is linked together, so, the air after indoor through the circulation can pass through the exhaust pipe is discharged indoorly. Under the action of the negative pressure fan, the air to be discharged outside in each floor or each house is uniformly collected into the centralized exhaust pipe for processing, so that the effective circulation of the air in the whole fresh air system can be realized, and the indoor air quality is improved. Because concentrated blast pipe and negative-pressure air fan all are used for arranging in outdoors, therefore can effectively reduce indoor occupation space, simultaneously, be used for externally concentrated blast pipe still does benefit to staff's installation, maintenance.

The technical solution is further explained below:

in one embodiment, the host machine further comprises a filtering device and a fresh air fan, and the filtering device and the fresh air fan are both arranged on the fresh air pipe.

In one embodiment, the inlet of the filter device is provided with a slope which is inclined around the circumferential direction of the inlet and towards the inlet.

In one embodiment, the main unit further comprises an exhaust fan, and the exhaust fan is arranged in the exhaust pipe.

In one embodiment, the negative pressure fan air exhausting device further comprises a signal connector, one end of the signal connector is electrically connected with the negative pressure fan, and the other end of the signal connector is electrically connected with the air exhausting fan.

In one of them embodiment, still include rain shade, be formed with both ends open-ended cavity in the rain shade, rain shade's one end opening with the air inlet end of fresh air pipe is connected, rain shade's other end opening sets up downwards and communicates with each other with the atmosphere, be equipped with the filter screen in the cavity.

In one embodiment, the exhaust system further comprises a three-way pipe, wherein the three-way pipe comprises a main pipe and a branch pipe communicated with the main pipe, the main pipe is connected with the centralized exhaust pipe, and the branch pipe is connected with the exhaust pipe; or the fresh air pipe is connected with the exhaust pipe through a heat conduction connecting sheet.

In one embodiment, the device further comprises a one-way valve, wherein the one-way valve is arranged in the branch pipe.

In one embodiment, the device further comprises a disinfection device, and the disinfection device is connected with one end, far away from the negative pressure fan, of the centralized exhaust pipe.

In one embodiment, the system comprises a plurality of the main machines, the air outlet ends of the fresh air pipes are communicated with indoor environments of different floors and/or different rooms in a one-to-one correspondence mode, and the air outlet ends of the exhaust pipes are respectively connected with the centralized exhaust pipe.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Furthermore, the drawings are not to scale of 1:1, and the relative dimensions of the various elements in the drawings are drawn only by way of example and not necessarily to true scale. In the drawings:

fig. 1 is a schematic structural diagram of a fresh air system in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a host according to an embodiment of the present invention;

fig. 3 is a schematic structural view of another view angle of the fresh air system in an embodiment of the present invention;

fig. 4 is a schematic view of the mechanism of the rain shade according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a heat-conducting connecting sheet according to an embodiment of the present invention.

The elements in the figure are labeled as follows:

10. a host; 110. a fresh air duct; 120. an exhaust duct; 130. a filtration device; 131. an inlet; 132. a bevel; 20. a centralized exhaust pipe; 30. a negative pressure fan; 40. a housing; 50. a rain shade; 60. filtering with a screen; 70. a three-way pipe; 710. a main pipe; 720. a branch pipe; 80. a heat conducting connecting sheet; 90. a sterilizing device.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

Referring to fig. 1, an embodiment provides a fresh air system, including: host computer 10, concentrated blast pipe 20 and negative-pressure air fan 30. The main body 10 includes a fresh air duct 110 and an exhaust duct 120. The air inlet end of the fresh air pipe 110 is used for communicating with outdoor atmosphere, the air outlet end of the fresh air pipe 110 is used for communicating with indoor environment, and the air inlet end of the exhaust pipe 120 is used for communicating with indoor environment. The centralized exhaust duct 20 is used to be placed outdoors, and the centralized exhaust duct 20 is communicated with the air outlet end of the exhaust duct 120. The negative pressure fan 30 is used outdoors, and the negative pressure fan 30 is connected to the collective exhaust duct 20.

In this embodiment, the main unit 10 of the fresh air system includes a fresh air pipe 110 and an exhaust pipe 120. Because the air inlet end of the fresh air pipe 110 is arranged outdoors and communicated with the outdoor atmosphere, and the air outlet end of the fresh air pipe 110 is arranged indoors and communicated with the indoor environment, outdoor fresh air energy continuously enters the indoor environment from the outdoor environment to improve the indoor air quality. Meanwhile, since the air inlet end of the exhaust duct 120 is disposed indoors and is communicated with the indoor environment, and the air outlet end of the exhaust duct 120 is disposed outdoors and is communicated with the centralized exhaust duct 20 disposed outdoors, air circulated indoors can be exhausted indoors through the exhaust duct 120. Under the action of the negative pressure fan 30, the air to be discharged outside in each floor and/or each house is uniformly collected into the centralized exhaust pipe 20 for processing, so that the effective circulation of the air in the whole fresh air system can be realized, and the indoor air quality is improved. Because the centralized exhaust pipe 20 and the negative pressure fan 30 are both used for being arranged outdoors, the occupied space indoors can be effectively reduced, and meanwhile, the centralized exhaust pipe 20 arranged externally is also beneficial to installation and maintenance of workers.

Referring to fig. 1, based on the above embodiment, in an embodiment, the main body 10 further includes a filter device 130 and a fresh air blower (not shown), and the filter device 130 and the fresh air blower are both disposed on the fresh air duct 110. The quality of air flowing outdoors is better than that of indoor air, but the outdoor air is easy to have fine impurities or harmful particles, such as flying floc; for another example, PM2.5, it is necessary to filter the air introduced into the room, thereby further improving the quality of the air in the room.

Alternatively, the filter elements within the filter assembly 130 may use different filter elements depending on different geographical climate characteristics. For example, the filter element in the filter device 130 may be made of a dehumidifying type water absorbing material, such as sponge, silica gel or water absorbent resin, because it is rainier in the south, especially in the rainy season. Also for example, northern rainfall is less and there are more production plants, and thus the amount of PM2.5 in northern air is greater. Since PM2.5 is easily accompanied by toxic and harmful substances, and after entering the respiratory tract of a human body, the ventilation function of the lung is directly affected, and the human health is harmed, the filter element in the filter device 130 can be made of materials with the function of filtering fine particles, such as activated carbon or glass fiber, aiming at PM 2.5.

Further, the filter element in the filter device 130 is detachable, so that the filter element inside can be replaced according to the use requirement, and the adaptability of the fresh air system is improved. Meanwhile, the filter element in the filter device 130 can be reused, for example, the filter element with the water absorbing material can be dried and reused, so that the use cost is saved.

Specifically, the fresh air blower is disposed in the fresh air duct 110. When the fresh air fan rotates, the air pressure in the fresh air pipe 110 is low, so that outdoor air can continuously enter the fresh air pipe 110 from the air inlet end of the fresh air pipe 110 and is finally discharged into a room, and the indoor air quality is improved.

Referring to fig. 2, on the basis of the above embodiment, in an embodiment, an inclined surface 132 is disposed at the inlet 131 of the filtering device 130 and is inclined toward the inlet 131 around the circumferential direction of the inlet 131. In this way, the water in the dust or humid air entering from the outside can be conveniently collected or flow out of the outside through the inclined plane 132, and the practicability of the filter device 130 is improved.

Optionally, the surface of the inclined surface 132 is smooth and coated with a hydrophobic material, thereby improving the utility of the inclined surface 132.

On the basis of the above embodiments, in one embodiment, the main unit 10 further includes an exhaust fan (not shown). The exhaust fan is disposed in the exhaust duct 120. When the exhaust fan rotates, the air pressure in the exhaust duct 120 is low, which is beneficial to the air circulating and flowing indoors to continuously enter the exhaust duct 120 from the air inlet end of the exhaust duct 120 and finally to be discharged into the centralized exhaust duct 20, thereby improving the indoor air quality.

Referring to fig. 1 and fig. 3, optionally, the host 10 further includes a housing 40, and the housing 40 has a protection function except for the air outlet end and the air outlet end of the fresh air pipe 110 and the air inlet end and the air outlet end of the exhaust pipe 120, and the remaining portions of the fresh air pipe 110 and the exhaust pipe 120 and the filter device 130 can be disposed in the housing 40, so that the safety of the filter device 130 and some of the pipes can be effectively ensured, and the service lives of the filter device 130 and some of the pipes can be prolonged.

Optionally, the position where the housing 40 is placed is not particularly limited, and it is only required to ensure that the air inlet end of the fresh air pipe 110 is located outdoors, the air outlet end of the fresh air pipe 110 is located indoors, and meanwhile, the air inlet end of the exhaust pipe 120 is located indoors, and the air outlet end of the exhaust pipe 120 is located outdoors.

Optionally, the housing 40 is placed outdoors, so that the indoor space occupied by the fresh air system can be further reduced, and the indoor valuable space is saved for the user.

On the basis of the above embodiments, in an embodiment, the fresh air system further includes a signal connector (not shown in the figure). One end of the signal connector is electrically connected with the negative pressure fan 30, and the other end of the signal connector is electrically connected with the exhaust fan. Therefore, the negative pressure fan 30 can be adjusted in a frequency conversion mode according to the opening condition of the exhaust fan, and energy consumption is saved. For example, when the room is unoccupied, the fresh air system is turned off, at this time, the exhaust fan does not work, the signal connector detects that the exhaust fan is in the shutdown state, and thus the negative pressure fan 30 does not work. For another example, when a person is in a room, after the fresh air system is turned on, the exhaust fan starts to operate, and the signal connector detects that the exhaust fan is in a working state, so that the negative pressure fan 30 starts to operate, and the fresh air system is ensured to be in a normal working state.

Optionally, the signal connector is a wireless connector, and the exhaust fan and the negative pressure fan 30 realize signal transmission through the wireless connector.

Optionally, the signal connector is a wired connector, and the exhaust fan and the negative pressure fan 30 realize signal transmission through the wired connector. When the signal connector is a wired connector, the protective sleeve is sleeved outside the wired connector so as to avoid artificial damage or natural aging after long-time exposure in the natural environment.

Referring to fig. 3 and 4, on the basis of the above embodiments, in an embodiment, the fresh air system further includes a rain shade 50. A cavity with two open ends is formed in the rain shade 50, one open end of the rain shade 50 is connected with the air inlet end of the fresh air pipe 110, the other open end of the rain shade 50 faces downwards and is communicated with the atmosphere, and a filter screen 60 is arranged in the cavity. The rain shade 50 is open at both ends and has a cavity inside, so that air can flow into the fresh air duct 110 through the rain shade 50. Because the one end opening that rainshelter 50 kept away from fresh air pipe 110 sets up downwards, so, can avoid rainy day rainwater to get into the cavity then and get into fresh air pipe 110 from this opening in, simultaneously, this opening sets up downwards and still is favorable to avoiding in the impurity gets into the cavity, for example, leaf, bird manure etc.. To further prevent impurities from entering the fresh air duct 110, a screen 60 is provided within the cavity.

Specifically, in the present embodiment, the filter screen 60 is disposed in the rain shade 50 at an opening at an end thereof away from the fresh air duct 110.

With reference to fig. 3, on the basis of the above embodiment, in an embodiment, the fresh air system further includes a three-way pipe 70. The tee pipe 70 includes a main pipe 710 and a branch pipe 720 communicating with the main pipe 710, the main pipe 710 is connected to the collective exhaust pipe 20, and the branch pipe 720 is connected to the exhaust pipe 120. In this way, the exhaust manifold 20 can be connected to a plurality of exhaust ducts 120 at the same time.

Referring to fig. 5, in order to save energy consumption, in an embodiment based on the above embodiments, the fresh air duct 110 and the exhaust duct 120 are connected by the heat-conducting connecting sheet 80. When the air conditioner is turned on indoors in summer, the indoor air temperature is lower than the outdoor air temperature, at the moment, the fresh air pipe 110 in the fresh air system sucks and exhausts air with higher outdoor temperature into the room, and the exhaust pipe 120 exhausts air with lower indoor temperature out of the room, so that energy waste is easily caused. When the heating device is turned on indoors in winter, the indoor air temperature is higher than the outdoor air temperature, at the moment, the fresh air pipe 110 in the fresh air system sucks and exhausts the air with the lower outdoor temperature into the room, and the exhaust pipe 120 exhausts the air with the higher indoor temperature out of the room, so that energy waste can be caused. Therefore, it is necessary to provide the heat-conducting connecting sheet 80 between the fresh air duct 110 and the exhaust duct 120, so that the heat of the fresh air duct 110 and the exhaust duct 120 can be exchanged, the temperature areas of the fresh air duct 110 and the exhaust duct 120 are consistent, and the energy consumption of indoor cooling or heating is saved.

Specifically, the heat-conducting connecting sheet 80 is connected to the outer wall of the fresh air duct 110 and the outer wall of the exhaust duct 120, respectively, and the heat-conducting connecting sheet 80 has a certain length, and the longer the portion of the fresh air duct 110 connected to the exhaust duct 120 is, the more heat is exchanged between the fresh air duct 110 and the exhaust duct 120, and the less energy is consumed by the whole fresh air system.

Alternatively, the materials selected for the fresh air duct 110, the exhaust duct 120 and the heat-conducting connecting sheet 80 are not particularly limited, and only the materials having good heat conductivity are ensured.

Specifically, in this embodiment, the fresh air duct 110, the exhaust duct 120, and the heat-conducting connecting sheet 80 are made of copper material with high heat conductivity.

On the basis of the above embodiments, in an embodiment, the fresh air system further includes a check valve (not shown in the figure). A one-way valve is disposed in the branch 720. In this way, the air in the exhaust duct 120 can flow to the branch pipe 720 and then into the central exhaust duct 20 under the action of the check valve, however, the air in the branch pipe 720 cannot flow back into the exhaust duct 120. Therefore, the arrangement of the one-way valve can effectively avoid the backflow of the air exhausted from the room to cause the pollution of the indoor air.

Referring to fig. 1 and fig. 3, on the basis of the above embodiments, in an embodiment, the fresh air system further includes a disinfecting device 90, and the disinfecting device 90 is connected to an end of the centralized exhaust pipe 20 away from the negative pressure fan 30. The fresh air system is used in a plurality of places, such as a household building with a large population; in addition, for example, in indoor places where people flow greatly, such as hospitals, subways, malls and the like, because population factors are complex, indoor air is often accompanied by a large amount of germs or other harmful substances, discharged gas needs to be collected uniformly, and can be discharged after disinfection, so that the spread of disease sources is avoided. Particularly, in the current epidemic period, if the indoor air is directly exhausted to the outdoor, poor infection is easily caused, and the spread of the epidemic is aggravated.

Optionally, the disinfecting liquid in the disinfecting device 130 is a volatile disinfecting liquid.

Specifically, in the present embodiment, the disinfecting device 130 is located at the bottom of the building, and the negative pressure fan 30 is located at the top of the building, so that the volatile disinfecting liquid can flow from the bottom of the building to the top of the building along the centralized exhaust duct 20 after being volatilized, thereby achieving the uniform disinfection of the air in the centralized exhaust duct 20.

Optionally, the disinfecting device 130 is disposed at an end of the exhaust duct 20 close to the negative pressure fan 30, and at this time, the disinfecting device 130 can spray the disinfecting liquid in a spraying manner, so as to further ensure a good sterilizing and disinfecting effect.

Referring to fig. 1 and fig. 3, based on the above embodiments, in an embodiment, the fresh air system includes a plurality of hosts 10, the air outlet ends of the fresh air pipes 110 are communicated with the indoor environments of different floors and/or different rooms in a one-to-one correspondence manner, and the air outlet ends of the exhaust pipes 120 are respectively connected with the centralized exhaust pipe 20. Since a building has multiple floors or multiple rooms, hosts are required to be installed in different floors and/or different rooms, in order to save resources, multiple hosts 10 can share the same centralized exhaust duct 20, and air exhausted from exhaust ducts 120 in different floors and/or different rooms can be exhausted into the same centralized exhaust duct 20 and then exhausted after centralized disinfection.

When a plurality of air exhaust fans are arranged in the fresh air system, each air exhaust fan is connected with the same negative pressure fan 30, so that the negative pressure fans 30 receive feedback given by different air exhaust fans, and the negative pressure fans 30 perform frequency conversion treatment. For example, when all the exhaust fans are turned on, each exhaust duct 120 discharges air to the collective exhaust duct 20, and the amount of air collected in the collective exhaust duct 20 is large, so that it is necessary for the negative pressure fan 30 to have a high rotational speed to satisfy the demand for rapid suction of the collective exhaust duct 20. For another example, when only a small part of the exhaust fans are turned on, a small part of the exhaust pipes 120 will exhaust air into the centralized exhaust pipe 20, and the amount of air collected in the centralized exhaust pipe 20 is small, so that the negative pressure fan 30 does not need to operate at a large rotation speed, thereby saving energy consumption. Therefore, the negative pressure fan 30 is connected with the exhaust fans of all floors and/or all rooms through the signal connector, and the negative pressure fan 30 can be adjusted in a frequency conversion mode according to the opening conditions of the exhaust fans of all floors and/or all rooms, so that energy consumption is saved.

In the whole fresh air system, because the indoor exhausted air is exhausted into the centralized exhaust pipe 20 and is disinfected, the germs in the exhausted air can be effectively killed, and the spread of the germs is avoided. Since the concentrated exhaust duct 20 is mainly used outdoors, it can be prevented from occupying indoor space; meanwhile, the concentrated exhaust pipe 20 is externally arranged, so that installation or maintenance of workers is facilitated, for example, when the number of floors is large, the concentrated exhaust pipe 20 is arranged outdoors, holes do not need to be drilled on a roof or a floor during installation, and the workers can directly lift and fix the concentrated exhaust pipe 20 outdoors; during maintenance, a worker can visually observe the damage condition of the concentrated exhaust pipe 20 outdoors, so that the maintenance operation is facilitated. Therefore, the fresh air system has the advantages of being easy to install and maintain and occupying less indoor space.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A fresh air system, comprising:

the air conditioner comprises a host, a fan and a fan, wherein the host comprises a fresh air pipe and an exhaust pipe, the air inlet end of the fresh air pipe is communicated with outdoor atmosphere, the air outlet end of the fresh air pipe is communicated with indoor environment, and the air inlet end of the exhaust pipe is communicated with indoor environment;

the centralized exhaust pipe is arranged outdoors and is communicated with the air outlet end of the exhaust pipe;

the negative pressure fan is arranged outdoors and connected with the centralized exhaust pipe.

2. The fresh air system as claimed in claim 1, wherein the main unit further comprises a filter device and a fresh air blower, and the filter device and the fresh air blower are both disposed on the fresh air pipe.

3. The fresh air system as claimed in claim 2, wherein the inlet of the filter device is provided with a slope which is inclined around the circumferential direction of the inlet and towards the inlet.

4. The fresh air system of claim 1 wherein the host further comprises an exhaust fan, the exhaust fan being disposed within the exhaust duct.

5. The fresh air system as claimed in claim 4, further comprising a signal connector, wherein one end of the signal connector is electrically connected to the negative pressure fan, and the other end of the signal connector is electrically connected to the exhaust fan.

6. The fresh air system according to claim 1, further comprising a rain shield, wherein a cavity with two open ends is formed in the rain shield, one open end of the rain shield is connected with the air inlet end of the fresh air pipe, the other open end of the rain shield faces downward and is communicated with the atmosphere, and a filter screen is arranged in the cavity.

7. The fresh air system as claimed in claim 1, further comprising a three-way pipe, the three-way pipe comprising a main pipe and a branch pipe communicated with the main pipe, the main pipe being connected with the centralized exhaust pipe, the branch pipe being connected with the exhaust pipe;

or the fresh air pipe is connected with the exhaust pipe through a heat conduction connecting sheet.

8. The fresh air system of claim 7 further comprising a one-way valve disposed within the bypass.

9. The fresh air system as claimed in any one of claims 1 to 8, further comprising a disinfection device connected to an end of the concentration exhaust pipe remote from the negative pressure fan.

10. The fresh air system as claimed in any one of claims 1 to 8, comprising a plurality of the main machines, wherein the air outlet ends of the fresh air pipes are communicated with indoor environments of different floors and/or different rooms in a one-to-one correspondence manner, and the air outlet ends of the exhaust pipes are respectively connected with the centralized exhaust pipe.

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