Room fresh air system and whole-house fresh air system

Abstract

The present invention discloses a room fresh air system and a whole-house fresh air system adopting the room fresh air system, the room fresh air system comprising: a branch air inlet, arranged above a door frame of a room door; an air inlet module, arranged on the branch air inlet, comprising a shell, wherein the shell has an air inlet cavity, one end of the air inlet cavity is connected to the branch air inlet, and the other end is connected to the inside of the room; a first fan is arranged in the air inlet cavity; a return air duct, one end of which is connected to the inside of the room, and the other end is connected to the outside of the room; under the action of the first fan, fresh air flows into the room from the branch air inlet and the air inlet cavity, replaces the dirty air in the room, and the dirty air is then discharged from the room via the return air duct.

Description

Technical Field

[0001] The present invention relates to the technical field of air exchange system design, and in particular to a room fresh air system and a whole-house fresh air system. Background Art

[0002] Inside buildings, especially houses, due to the need to set up different family functional spaces such as living rooms, bedrooms, study rooms, kitchens, bathrooms, and storage rooms, the original large-scale building space with good ventilation and lighting conditions has been divided into many smaller unit spaces by internal walls and doors and windows; these walls and doors and windows cut off the airflow and light connection between each unit space, and the ventilation and lighting conditions of each unit space become worse; at the same time, inside buildings, especially houses, the indoor air becomes polluted due to the breathing and excretion of humans and animals, the diffusion of gas and oil smoke during cooking, the drifting of water vapor during bathing and cleaning, the volatilization of benzene and aldehyde components in various artificial materials, etc.; because of the obstruction of these internal walls and doors, the indoor polluted air cannot be diffused, diluted, or discharged, causing serious problems with the air quality inside the building.

[0003] In recent years, some real estate companies and owners have tried to use the method of arranging two-way flow fan ducts, such as Figure 1 As shown, the fresh air outside is forced into the room and the dirty air inside is directed to the outside, which has achieved great results; Figure 1 In the figure, the hollow arrows and solid arrows represent two-way flow, namely the fresh air introduced into the house and the polluted air discharged from the house.

[0004] However, there are three problems with the large-scale use of two-way flow whole-house fresh air systems with supply and exhaust ducts in buildings and residences as described above:

[0005] 1. Complex decoration and high cost

[0006] These winding, dark, and damp air conditioning ducts are not only complex to install, but also require decorative coverings to improve the visual effect. They also require ceiling installations to conceal the inlets and outlets of the fresh air and return air ducts, making the fresh air system the highest cost item in building renovations.

[0007] 2. Secondary pollution caused by air supply pipe

[0008] During the operation and shutdown phases of the fresh air system, a large amount of dust that cannot be removed accumulates in the air ducts and in the decorative interlayers covering the air ducts, breeding bacteria and mold. It also provides a breeding ground for mosquitoes, flies, bedbugs, cockroaches, and even rats. In particular, the inner walls of the air supply ducts (fresh air ducts) often condense and adhere to dust, becoming a culture medium for bacteria and microorganisms. The accumulated dust, microorganisms, bedbug and cockroach feces, etc., are blown into the indoor space with the fresh air, causing new secondary pollution problems.

[0009] 3. Poor fresh air replacement effect

[0010] The two-way flow fresh air system of each room, the fresh air inlet and the dirty air outlet are all installed on the ceiling under the room ceiling. Although the design and construction pay attention to the staggered installation in the horizontal direction of the ceiling, the fresh air inlet and the dirty air outlet cannot be staggered in the vertical direction, that is, the height direction; Since the speed of the fresh air added by the fresh air inlet is usually around 2m / s, the downward dynamic pressure head is very small, a part of the fresh air flow does not sink deeply to participate in the fresh air replacement, but finds the shortest distance and least resistance path between the fresh air inlet and the dirty air outlet, and goes straight to the outlet along the ceiling surface. Figure 2 As shown, this causes a short circuit in the fresh air flow, wastes fresh air resources, and results in poor fresh air replacement effect. Summary of the Invention

[0011] To address the three major issues in the background art, namely, secondary pollution of air supply pipes, poor replacement effect of fresh air short circuit, and high decoration cost of complex air supply and exhaust pipes, the present invention provides a room fresh air system, comprising:

[0012] The air inlet is located above the door frame of the room;

[0013] An air inlet module is provided on the branch air inlet and includes a shell. The shell has an air inlet cavity therein. One end of the air inlet cavity is connected to the branch air inlet and the other end is connected to the room. A first fan is provided in the air inlet cavity.

[0014] a return air duct, one end of which is connected to the interior of the room and the other end of which is connected to the exterior of the room;

[0015] Under the action of the first fan, fresh air flows into the room from the branch air inlet and the air inlet cavity to replace the dirty air in the room, and the dirty air is then discharged from the room through the return air duct.

[0016] Preferably, the wall of the room close to the public space connected thereto has a vertically extending hollow wall column, the hollow wall column constitutes the return air duct, one end of the hollow wall column close to the ground is connected to the inside of the room, and the other end is connected to the outside of the room.

[0017] Preferably, the hollow wall column is arranged on one side of the door of the room.

[0018] Preferably, the room has two front and rear doors on the wall on the side close to the public space, the branch air inlet and the two-in-one air supply module are arranged above the door frame of one of the doors, and the return air duct is arranged near the other door.

[0019] Preferably, an air damper is provided in the branch air inlet or the air inlet cavity.

[0020] Preferably, the first fan air outlet is composed of an arc-shaped air outlet surface and a vertical air outlet surface.

[0021] The present invention also provides a whole-house fresh air system for a room group, wherein the room group includes a plurality of rooms and a public space connected to each room; wherein each room is provided with the room fresh air system as described above; the whole-house fresh air system further includes:

[0022] A main air inlet is provided on the wall of the public space or one of the rooms to connect the room or the public space with the outside air of the room group, and the branch air inlets on each of the rooms are connected with the public space;

[0023] A main air outlet is provided on a wall of the public space or one of the rooms;

[0024] The main exhaust duct has one end connected to the main air outlet and the other end connected to the return air duct.

[0025] Preferably, the main air outlet is provided with a second fan and / or the main air inlet is provided with a third fan.

[0026] Under the action of the second fan and / or the third fan, fresh air from the outside enters the public space directly through the main air inlet or enters the public space through the room provided with the main air inlet; the first fan and the second fan generate a pressure difference at the air inlet and outlet of the room, so that the fresh air replaces the dirty air in the room, and the dirty air is then discharged through the room return air duct, the main exhaust duct, and the main air outlet under the suction action of the second fan.

[0027] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0028] 1. Make full use of the space above the door frame

[0029] The present invention fully exploits the advantages of the door as a control node for the entry and exit of people and objects in the room, the space before and after the door is free of obstruction by furniture and objects, and the passage before and after the door is conducive to airflow. The air inlet module 4 on the upper part of the door frame is used as a means of regulating the fresh air flow, and the public space and the room that needs to replace the fresh air are used as the air duct. Most of the air ducts of the traditional residential fresh air system, including all the fresh air supply ducts, and the corresponding ceiling decoration that conceals the air ducts are eliminated.

[0030] 2. Eliminate secondary pollution of air supply pipe

[0031] During the operation and shutdown phases of traditional two-way residential fresh air systems, large amounts of dust that cannot be removed accumulate in the supply and exhaust ducts, as well as in the decorative interlayers between the ducts and the duct coverings, breeding bacteria and mold. This also provides a breeding ground for mosquitoes, flies, bedbugs, cockroaches, and even rats. The inner walls of the supply ducts (fresh air ducts) are particularly prone to condensation, and the attached moist dust becomes a culture medium for bacteria and microorganisms, generating new secondary pollution. The bacteria, microorganisms, bedbug and cockroach feces accumulated in the ducts are blown into the indoor space along with the fresh air during fresh air replacement, causing new and serious secondary pollution problems.

[0032] The present invention uses public spaces and rooms that need to replace fresh air as air ducts, cancels all fresh air supply pipes and corresponding concealing decorations in traditional residential fresh air systems, and eliminates the problem of secondary pollution of air supply pipes.

[0033] 4. Improve the fresh air replacement effect

[0034] In traditional homes, both fresh air supply vents and polluted air exhaust vents are located on the ceiling below the room. Because the fresh air velocity entering the supply vents is typically around 2m / s, the downward dynamic pressure head is very small. As a result, some fresh air does not sink deeply enough to participate in fresh air replacement. Instead, it seeks the path of least resistance and shortest distance between the fresh air positive-pressure supply vents and the polluted air negative-pressure exhaust vents, flowing directly along the ceiling surface toward the exhaust vents. This causes some fresh air to short-circuit, wasting fresh air resources. Furthermore, it creates large ventilation blind spots at the bottom and corners of the room, resulting in poor fresh air replacement effectiveness.

[0035] The present invention delivers high-level fresh air to the room through the air intake module. The high-level fresh air pours down from above the door head to the main space of the room, forcing the polluted air to make a compound movement of vertical descent and horizontal translation from top to bottom and from the outer wall to the bottom of the inner wall of the room, and gathers at the return air outlet at the bottom of the return air duct of the room in a negative pressure state, and is sucked into the main exhaust duct in a negative pressure state and discharged to the outdoors by the main exhaust outlet fan. The present invention adopts an airflow pattern of high supply and low exhaust of fresh air, which fundamentally changes the problem of fresh air short-circuiting in traditional fresh air systems where the room inlets and outlets are at the same ceiling plane, resulting in part of the fresh air not being able to sink deeply but finding the shortest distance with the least resistance from the positive pressure supply outlet to go directly to the negative pressure exhaust outlet, thereby improving the fresh air replacement effect.

[0036] 4. Reduce the cost of residential whole-house fresh air system

[0037] Traditional residential two-way flow whole-house fresh air systems utilize two sets of main air intake and exhaust lines and supply and return air ducts in and out of each room, creating a meridian-like system throughout the house. This system uses positive pressure to deliver fresh air to every room and negative pressure to extract stale air from each room. These circuitous supply and return air ducts, including the main lines and the room supply and return air ducts, are not only complex to install, but also require post-installation cladding and decoration to improve the visual effect. Furthermore, ceilings must be installed to conceal the fresh air and return air ducts and inlets and outlets, making the fresh air system the most expensive component of building renovation costs.

[0038] The present invention uses public spaces and rooms that need to replace fresh air as air ducts, eliminates all fresh air supply ducts of the traditional fresh air system and the corresponding decoration of the air ducts and return air vents, greatly reduces the material usage and on-site installation workload of the whole-house fresh air system, and thus greatly reduces the decoration cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The above and other features and advantages of the present invention will be more clearly understood through the following detailed description in conjunction with the accompanying drawings, in which:

[0040] Figure 1 This is a schematic diagram of the ventilation system in the existing room group;

[0041] Figure 2 A schematic diagram of air exchange for a single room in an existing room group;

[0042] Figure 3 This is a schematic diagram of the room in the fresh air replacement mode in Example 1;

[0043] Figure 4 This is a cross-sectional view of the room in the fresh air replacement mode in Example 1;

[0044] Figure 5 This is a schematic diagram of the room in the fresh air replacement mode in Example 2;

[0045] Figure 6 This is a cross-sectional view of the room in the fresh air replacement mode in Example 2;

[0046] Figure 7 Schematic diagram of the structure of the air inlet module in Example 2;

[0047] Figure 8 This is a schematic diagram of the room in the fresh air replacement mode in Example 3;

[0048] Figure 9 This is a schematic diagram of the whole-house fresh air system provided in Example 4. DETAILED DESCRIPTION

[0049] The present invention will be described in more detail below with reference to the accompanying drawings illustrating embodiments of the present invention. However, the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and so that those skilled in the art will fully understand the scope of the present invention. In these drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity.

[0050] Example 1

[0051] Reference Figure 3-4 The present invention provides a room fresh air system, including a branch air inlet 8, an air inlet module and a return air duct 5; the branch air inlet 8 is arranged above the door frame of the room 2; the air inlet module 4 is arranged on the branch air inlet 8, the air inlet module includes a shell, the shell has an air inlet cavity, one end of the air inlet cavity is connected with the branch air inlet 8, and the other end is connected with the room 2; a first fan is arranged in the air inlet cavity; one end of the return air duct 5 is connected with the room 2, and the other end is connected with the outside of the room (for example, a passage 1 as a public space); under the action of the first fan, fresh air flows into the room 2 from the branch air inlet 8 and the air inlet cavity, replaces the dirty air in the room 2, and the dirty air is discharged from the room through the return air duct 5, and can finally be discharged to the external environment through the main exhaust duct 3.

[0052] The room fresh air system provided by this embodiment is divided into an air inlet 8 and an air inlet module 4 arranged above the door frame. This embodiment fully exploits the advantages of the door as a control node for the entry and exit of people and objects in the room, the space before and after the door is free of obstruction by furniture and objects, and the passage before and after the door is conducive to airflow. The air inlet module 4 on the upper part of the door frame is used as a means of regulating the fresh air flow, and the public space and the room that needs to replace the fresh air are used as the air duct. Most of the air ducts of the traditional residential fresh air system, including all the fresh air supply ducts, and the corresponding ceiling decoration that conceals the air ducts are eliminated.

[0053] In this embodiment, the outlet 7 connecting the air inlet cavity to room 2 is located near the top of the room, and the inlet 6 connecting the return air duct 5 to the room is located near the bottom of the room. This arrangement achieves a high-input, low-exhaust airflow pattern within the room, fundamentally reversing the problem of traditional fresh air systems where the room's air inlet and outlet are located at the same level of the ceiling, causing some fresh air to fail to settle to the bottom and instead seek the shortest path of minimum resistance from the positive-pressure air inlet directly to the negative-pressure air outlet.

[0054] Furthermore, the outlet 7 connecting the air inlet cavity to the room 2 and the inlet 6 connecting the return air duct to the room are arranged far away from each other in the horizontal direction; the above design is conducive to further realizing the complex lateral movement of the air in the room, greatly reducing the ventilation blind spots inside the room, high utilization rate of fresh air resources, and good fresh air replacement effect.

[0055] In this embodiment, a damper is provided in the sub-air inlet or the air inlet cavity, and the damper is used to control the on-off of the sub-air inlet. When the room needs to be ventilated, the damper can be opened.

[0056] The room fresh air system provided in this embodiment has the following advantages:

[0057] 1. Make full use of the space above the door frame

[0058] The present invention fully exploits the advantages of the door as a control node for the entry and exit of people and objects in the room, the space before and after the door is free of obstruction by furniture and objects, and the passage before and after the door is conducive to airflow. The air inlet module 4 on the upper part of the door frame is used as a means of regulating the fresh air flow, and the public space and the room that needs to replace the fresh air are used as the air duct. Most of the air ducts of the traditional residential fresh air system, including all the fresh air supply ducts, and the corresponding ceiling decoration that conceals the air ducts are eliminated.

[0059] 2. Eliminate secondary pollution of air supply pipe

[0060] During the operation and shutdown phases of traditional two-way residential fresh air systems, large amounts of dust that cannot be removed accumulate in the supply and exhaust ducts, as well as in the decorative interlayers between the ducts and the duct coverings, breeding bacteria and mold. This also provides a breeding ground for mosquitoes, flies, bedbugs, cockroaches, and even rats. The inner walls of the supply ducts (fresh air ducts) are particularly prone to condensation, and the attached moist dust becomes a culture medium for bacteria and microorganisms, generating new secondary pollution. The bacteria, microorganisms, bedbug and cockroach feces accumulated in the ducts are blown into the indoor space along with the fresh air during fresh air replacement, causing new and serious secondary pollution problems.

[0061] The present invention uses public spaces and rooms that need to replace fresh air as air ducts, cancels all fresh air supply pipes and corresponding concealing decorations in traditional residential fresh air systems, and eliminates the problem of secondary pollution of air supply pipes.

[0062] 4. Improve the fresh air replacement effect

[0063] In traditional homes, both fresh air supply vents and polluted air exhaust vents are located on the ceiling below the room. Because the fresh air velocity entering the supply vents is typically around 2m / s, the downward dynamic pressure head is very small. As a result, some fresh air does not sink deeply enough to participate in fresh air replacement. Instead, it seeks the path of least resistance and shortest distance between the fresh air positive-pressure supply vents and the polluted air negative-pressure exhaust vents, flowing directly along the ceiling surface toward the exhaust vents. This causes some fresh air to short-circuit, wasting fresh air resources. Furthermore, it creates large ventilation blind spots at the bottom and corners of the room, resulting in poor fresh air replacement effectiveness.

[0064] The present invention delivers high-level fresh air to the room through the air intake module. The high-level fresh air pours down from above the door head to the main space of the room, forcing the polluted air to make a compound movement of vertical descent and horizontal translation from top to bottom and from the outer wall to the bottom of the inner wall of the room, and gathers at the return air outlet at the bottom of the return air duct of the room in a negative pressure state, and is sucked into the main exhaust duct in a negative pressure state and discharged to the outdoors by the main exhaust outlet fan. The present invention adopts an airflow pattern of high supply and low exhaust of fresh air, which fundamentally changes the problem of fresh air short-circuiting in traditional fresh air systems where the room inlets and outlets are at the same ceiling plane, resulting in part of the fresh air not being able to sink deeply but finding the shortest distance with the least resistance from the positive pressure supply outlet to go directly to the negative pressure exhaust outlet, thereby improving the fresh air replacement effect.

[0065] 4. Reduce the cost of residential whole-house fresh air system

[0066] Traditional residential two-way flow whole-house fresh air systems utilize two sets of main air intake and exhaust lines and supply and return air ducts in and out of each room, creating a meridian-like system throughout the house. This system uses positive pressure to deliver fresh air to every room and negative pressure to extract stale air from each room. These circuitous supply and return air ducts, including the main lines and the room supply and return air ducts, are not only complex to install, but also require post-installation cladding and decoration to improve the visual effect. Furthermore, ceilings must be installed to conceal the fresh air and return air ducts and inlets and outlets, making the fresh air system the most expensive component of building renovation costs.

[0067] The present invention uses public spaces and rooms that need to replace fresh air as air ducts, eliminates all fresh air supply ducts of the traditional fresh air system and the corresponding decoration of the air ducts and return air vents, greatly reduces the material usage and on-site installation workload of the whole-house fresh air system, and thus greatly reduces the decoration cost.

[0068] Example 2

[0069] Reference Figure 5-7 This embodiment is an adjustment based on embodiment 1.

[0070] In this embodiment, the main exhaust duct 3 is located at the top of the passageway. A vertically extending hollow wall column 10 is located on one side of the doorway. This hollow wall column 10 forms the return air duct 5. The upper end of the hollow wall column 10 is connected to the main exhaust duct 3, and the lower end has an inlet 6 that connects to the room. This hollow wall column 10 is located anywhere on the wall near the passageway. This embodiment fully utilizes the space within the hollow door column to form the return air duct 5, eliminating the need for additional pipe fittings and conserving the indoor space typically occupied by external return air ducts.

[0071] In this embodiment, the outlet 7 of the air inlet cavity is composed of an arc-shaped air outlet surface 701 and a vertical air outlet surface 702; the purpose of such a setting is to ensure that the air output from the first fan can be fully diffused.

[0072] The other structures of the room fresh air system in this embodiment can refer to the description in Example 1 and are not limited here.

[0073] Example 3

[0074] Reference Figure 8 This embodiment is an adjustment based on embodiment 1.

[0075] In this embodiment, there are two front and rear doors (door 11 and door 12) on the wall of the room close to the passage. The air inlet 8 and the air inlet module 4 are arranged above the door frame of one of the doors 11, and the return air duct 5 is arranged near the other door 12, and can be directly composed of a hollow wall column 13 on the left side of the door 12.

[0076] This embodiment further separates the air inlet 8, the air inlet module 4, the return air duct 5 and the air outlet 6, which greatly reduces the ventilation blind area inside the room, has a high utilization rate of fresh air resources, and has a good fresh air replacement effect.

[0077] The other structures of the room fresh air system in this embodiment can refer to the description in Example 1 and are not limited here.

[0078] Example 4

[0079] Reference Figure 9 The present invention provides a whole-house fresh air system for exchanging fresh air in a room group, wherein the room group includes a plurality of rooms and a public space connected to each room, and the public space includes a hall and a passage connected to each room;

[0080] The room is provided with a room fresh air system as described in any one of embodiments 1-4;

[0081] The whole-house fresh air system also includes a main air inlet 14, a main air outlet 15 and a main exhaust duct 3; the main air inlet 14 is arranged on the outer wall of the channel 1 or one of the rooms 2 to realize the connection between the room or the channel and the outside air of the room group; the branch air inlet 8 is arranged on each room to realize the connection between each room 2 and the channel 1; the main air outlet 15 is arranged on the outer wall of the channel 1 or one of the rooms 2, the main exhaust duct 3 is connected to the main air outlet 15, and the main exhaust duct 3 is also connected to the return air duct 5 of each room.

[0082] Among them, the main air inlet can be set in the public space. In this case, the outside fresh air directly enters the public space through the main air inlet, and then enters each room through the branch air inlets on each room for fresh air replacement;

[0083] Alternatively, the main air inlet is set in one of the rooms, and the outside fresh air first enters the room, and then enters the public space through the door of the room or the branch air inlet; after entering the public space, the fresh air enters each room through the branch air inlet on each room for fresh air replacement;

[0084] Alternatively, the main air inlet and main air outlet can be set in the same room or in two different rooms; in this case, the outside fresh air first enters the room with the main air inlet, and then enters the public space through the door of the room or the branch air inlet; after entering the public space, the fresh air enters each room through the branch air inlet on each room for fresh air replacement;

[0085] As mentioned above, the locations of the main air inlet and the main air outlet can be adjusted according to specific circumstances and are not restricted here.

[0086] The room fresh air system and the whole-house fresh air system provided by the present invention are applicable to various types of housing systems, such as residential houses, office buildings, hotels and other places, without limitation here.

[0087] When fresh air replacement is required, the second fan and / or the third fan is started. Under the action of the second fan and / or the third fan, the outside air enters the channel directly from the main air inlet 14 or first enters one of the rooms and then enters the channel; under the action of the first fan and the second fan, the fresh air in the channel enters each room 2 from the air inlet 8 and the air inlet module 4 for fresh air replacement, and the dirty air is then discharged outside the room group through the return air duct 5, the main exhaust duct 3, the second fan, and the main air outlet 15, thereby completing the fresh air replacement.

[0088] In this embodiment, an air inlet module 16 and an air outlet module 17 may be added to the main air inlet 14 and the main air outlet 15 respectively; the air inlet module 16 and the air outlet module 17 may specifically include a fan, an air damper, etc., and the air inlet module 11 may further include a filtering device, a heat exchanger and other devices, which are not limited here.

[0089] Furthermore, the air outlet module 17 includes a second fan, and the air inlet module 16 includes a third fan.

[0090] Those skilled in the art will appreciate that the present invention may be implemented in many other specific forms without departing from its spirit or scope. Although embodiments of the present invention have been described, it should be understood that the present invention is not limited to these embodiments, and those skilled in the art may make changes and modifications within the spirit and scope of the present invention as defined by the appended claims.

Claims

1. A whole-house fresh air system, characterized in that: Used for a room group, the room group includes multiple rooms and a public space connected to each room; wherein each room is equipped with a room fresh air system; The room fresh air system includes: The air inlet is located above the door frame of the room; An air inlet module is provided on the branch air inlet and includes a shell. The shell has an air inlet cavity therein. One end of the air inlet cavity is connected to the branch air inlet and the other end is connected to the room. A first fan is provided in the air inlet cavity. a return air duct, one end of which is connected to the interior of the room and the other end of which is connected to the exterior of the room; Under the action of the first fan, fresh air flows into the room from the branch air inlet and the air inlet cavity, replacing the dirty air in the room, and the dirty air is then discharged from the room through the return air duct; The inlet of the return air duct communicating with the room is arranged near the bottom of the room; the outlet of the air inlet cavity communicating with the room and the inlet of the return air duct communicating with the room are arranged horizontally away from each other; The whole-house fresh air system also includes: The main air inlet is arranged on the wall of the public space or one of the rooms to realize the connection between the room or the public space and the outside air of the room group; when the main air inlet is arranged on the public space, the outside fresh air directly enters the public space through the main air inlet; when the main air inlet is arranged in one of the rooms, the outside fresh air first enters the room, and then enters the public space through the door or branch air inlet of the room; the branch air inlets on each of the rooms are connected to the public space; the main air inlet is provided with a main air inlet module; A main air outlet is provided on a wall of the public space or one of the rooms; A main exhaust duct, one end of which is connected to the main air outlet and the other end of which is connected to the return air duct; The main air outlet is provided with a second fan and the main air inlet is provided with a third fan.

2. The whole-house fresh air system according to claim 1, characterized in that: Under the action of the second fan and / or the third fan, fresh air from the outside enters the public space directly through the main air inlet or enters the public space through the room provided with the main air inlet; the first fan and the second fan generate a pressure difference at the air inlet and outlet of the room, so that the fresh air replaces the dirty air in the room, and the dirty air is then discharged through the room return air duct, the main exhaust duct, and the main air outlet under the suction action of the second fan.

3. The whole-house fresh air system according to claim 1, characterized in that: The room has a vertically extending hollow wall column in the wall on the side close to the public space connected thereto, and the hollow wall column constitutes the return air duct. One end of the hollow wall column close to the ground is connected to the inside of the room, and the other end is connected to the outside of the room.

4. The whole-house fresh air system according to claim 3, characterized in that: The hollow wall column is arranged on one side of the door of the room.

5. The whole-house fresh air system according to claim 1, characterized in that: The room has two front and rear doors on a wall near the public space. The branch air inlet and the air inlet module are arranged above the door frame of one of the doors, and the return air duct is arranged near the other door.

6. The whole-house fresh air system according to claim 1, characterized in that: An air door is provided in the branch air inlet or the air inlet cavity.

7. The whole-house fresh air system according to claim 1, characterized in that: The first fan air outlet is composed of an arc-shaped air outlet surface and a vertical air outlet surface.

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