Fresh air duct system, fresh air system and air conditioner

Abstract

The utility model relates to a fresh air duct system, a fresh air system and an air conditioner. The fresh air duct system comprises a shell and a fan blade volute. Wherein an external air opening and at least one first internal air opening are formed in the shell; the fan blade volute is located in the outer shell, a volute air duct is arranged in the fan blade volute, and an exhaust air duct separated from the volute air duct is arranged between the outer wall of the volute and the inner wall of the outer shell. A second internal air port communicated with the volute air duct through a fourth air duct control valve is formed in the shell; the first end of the volute air duct is communicated with an external air port through a first air duct control valve; the second end of the volute air duct is connected with the exhaust air duct and one of the at least one first internal air port through a second air duct control valve; the second end of the volute air duct communicates with an external air opening through the exhaust air duct, and a third air duct control valve is arranged in the exhaust air duct. An air inlet channel or an air exhaust channel communicated with an external air opening can be formed by controlling the control valves to be switched on or switched off.

Description

Technical Field

[0001] This application relates to the field of central air conditioning indoor units, and more particularly to a duct system, a central air conditioning indoor unit, and an air conditioner. Background Technology

[0002] Fresh air conditioning units combine multiple functions such as air purification, temperature regulation, and fresh air exchange, which can meet the modern family's pursuit of a high-quality life.

[0003] The development of fresh air conditioning is currently quite rapid, and it represents a new trend in air conditioning development. Fresh air modules are used in both wall-mounted units and indoor units. At present, the application of fresh air modules in wall-mounted units and indoor units is mainly based on unidirectional air supply, which means delivering outdoor air to the room to make the indoor air fresh.

[0004] However, besides supplying air into the room, if the indoor air is stale, expelling the stale air outwards can also quickly achieve indoor air exchange. For example, in a chess and card room or a room where many people gather, if multiple people smoke, the indoor air becomes very smoky, and simply supplying air into the room is insufficient. Simultaneously supplying air outwards within an existing fresh air conditioning system would require adding new ductwork, making the internal ductwork layout of the fresh air conditioning system very complex. Utility Model Content

[0005] This application provides a fresh air duct system and an air conditioner to solve the technical problem of complex internal duct layout when the fresh air conditioner simultaneously delivers air inward and outward.

[0006] This utility model provides a fresh air duct system, the fresh air duct system comprising:

[0007] The outer casing and the fan blade vortex casing; wherein the outer casing is provided with an external air vent and at least one first internal air vent;

[0008] The fan blade volute is located inside the outer shell, and a volute air duct is provided inside the fan blade volute. An exhaust air duct is provided between the outer wall of the volute and the inner wall of the outer shell, which is separated from the volute air duct. A second internal air outlet is provided on the outer shell and is connected to the volute air duct through a fourth air duct control valve.

[0009] The first end of the vortex-shaped air duct is connected to the external air outlet through a first air duct control valve; the second end of the vortex-shaped air duct is connected to the exhaust air duct and at least one of the first internal air outlets through a second air duct control valve.

[0010] The exhaust duct connects the second end of the vortex duct to an external air outlet, and a third duct control valve is installed inside the exhaust duct.

[0011] By controlling the opening or closing of the first air duct control valve, the third air duct control valve, the fourth air duct control valve, and each second air duct control valve, an air intake channel can be formed along the direction of the external air outlet, the volute air duct, and at least one first internal air outlet; or, an exhaust channel can be formed along the direction of the second internal air outlet, the volute air duct, the exhaust air duct, and the external air outlet.

[0012] Optionally, the outer shell includes a first shell and a second shell that are arranged in two layers and separated from each other. The first shell and the second shell are connected by a vortex shell through hole. The vortex shell air duct and the exhaust air duct are both arranged in the second shell. The vortex shell air duct is located in the second shell and is connected to the vortex shell through hole.

[0013] A wind cavity is provided on one side of the first housing and the second housing. The wind cavity is connected to the space of the first housing through a first air duct control valve. The wind cavity is connected to the second end of the exhaust air duct through a third control valve.

[0014] Optionally, the external air vent includes: a first sub-air vent and a second sub-air vent arranged symmetrically;

[0015] The first sub-air outlet is provided with at least one first guide plate; the second sub-air outlet is provided with at least one second guide plate; the number of the first guide plate and the second guide plate are equal, and the tilt angles of the first guide plate and the second guide plate are symmetrically arranged.

[0016] And / or, an air inlet partition plate is provided inside the first housing; the center points of the first sub-air inlet and the second sub-air inlet are located on the extension line of the air inlet partition plate.

[0017] Optionally, two constricted guide plates are symmetrically arranged inside the air cavity, pointing towards the inside of the first housing along the direction of the external air vent. The two constricted guide plates are arranged in an arc shape so that the air entering from the external air vent is gathered and blown into the first housing.

[0018] Optionally, the first air duct control valve includes: a first air duct baffle and a first drive mechanism. A mounting hole is provided on the baffle between the first housing and the second housing. The air duct baffle is disposed in the mounting hole. The first drive mechanism can drive the first air duct baffle to move in the mounting hole. The first air duct baffle is moved into the first housing, and the external air outlet is separated from the interior space of the first housing. The first air duct baffle is moved into the second housing, and the external air outlet is connected to the interior space of the first housing.

[0019] Optionally, there are two first internal air vents, and the second air duct control valve includes:

[0020] A first rotating partition that corresponds to each of the first internal air vents and can be rotated to close or open the first internal air vents;

[0021] A second rotating baffle plate that corresponds to the position of the first port of the exhaust duct and can be rotated to close or open the first port of the exhaust duct;

[0022] The second driving mechanism drives the first rotating partition and the second rotating partition respectively.

[0023] Optionally, the third air duct control valve includes a third rotating baffle and a third driving mechanism. The third rotating baffle is disposed between the air cavity and the second port located in the exhaust air duct. The third rotating baffle can rotate under the drive of the third driving mechanism to close or open the exhaust air duct.

[0024] Optionally, the fresh air duct system further includes: a return air inlet;

[0025] The return air vent is located on the side of the first housing, and the return air vent and the external air vent are on different sides;

[0026] The first housing is provided with a return air channel, which is connected to the vortex shell through hole; the return air channel is provided with a return air duct control valve to control the closing or opening of the return air channel.

[0027] This application also provides a fresh air system, including a centrifugal fan and a fresh air duct system as provided in any of the foregoing embodiments, wherein the centrifugal fan is installed inside the fan blade volute.

[0028] This application also provides an air conditioner, including the fresh air system provided in the foregoing embodiments, wherein the air inlet of the indoor unit of the air conditioner is connected to the second air outlet.

[0029] The fresh air duct system provided in this application embodiment has two independent volute ducts and an exhaust duct inside the outer casing. The exhaust duct can also connect the second end of the volute duct to an external air outlet. Therefore, in actual use, by controlling the opening and closing of the first, third, and fourth duct control valves, as well as each second duct control valve, an air intake duct can be formed along the direction of the external air outlet, the volute duct, and at least one first internal air outlet; or, an exhaust duct can be formed along the direction of the second internal air outlet, the volute duct, the exhaust duct, and the external air outlet. This allows for air intake and exhaust to be achieved using a single external air outlet, and the exhaust duct can be formed using the outer wall of the volute and the inner wall of the outer casing, eliminating the need for a separate exhaust duct and simplifying the structure. Attached Figure Description

[0030] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0031] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0033] Figure 1 A schematic diagram of a fresh air duct system provided in an embodiment of this application;

[0034] Figure 2 This is another structural schematic diagram of the fresh air duct system provided in the embodiments of this application;

[0035] Figure 3 This is another structural schematic diagram of the fresh air duct system provided in the embodiments of this application;

[0036] Figure 4 This is a schematic diagram of the internal structure of the first housing of the fresh air duct system provided in an embodiment of this application;

[0037] Figure 5 This is a schematic diagram of the internal structure of the fresh air duct system provided in the embodiments of this application;

[0038] Figure 6 This is a schematic diagram of the internal structure of the fresh air duct system provided in the embodiments of this application;

[0039] Figure 7 This is a schematic diagram of the internal structure of the fresh air duct system provided in the embodiments of this application;

[0040] Figure 8 A schematic diagram illustrating the connection between the fresh air duct system and the indoor unit of an air conditioner, provided in an embodiment of this application.

[0041] Figure 9 Another schematic diagram illustrating the connection between the fresh air duct system and the indoor unit of an air conditioner, as provided in this embodiment of the application;

[0042] Figure 10 This is a schematic diagram of the internal structure of the fresh air duct system provided in the embodiments of this application;

[0043] Figure 11 A schematic diagram of the structure of the second air duct control valve of the fresh air duct system provided in the embodiments of this application;

[0044] Figure 12 This is a schematic diagram of the external air outlet of the fresh air duct system provided in the embodiments of this application;

[0045] Figure 13 A detailed structural diagram of the external air outlet of the fresh air duct system provided in this application embodiment;

[0046] Figure 14 This is a schematic diagram of the internal structure of the fresh air duct system provided in the embodiments of this application;

[0047] Figure 15 This is a schematic diagram of the internal structure of the fresh air duct system provided in the embodiments of this application;

[0048] Figure 16 This is a schematic diagram of the internal structure of the second housing of the fresh air duct system provided in an embodiment of this application;

[0049] Figure 17 This is a schematic diagram of the internal structure of the second housing of the fresh air duct system provided in an embodiment of this application;

[0050] Figure 18 This is a schematic diagram of the exhaust duct of the fresh air duct system provided in the embodiments of this application;

[0051] Figure 19 This is a schematic diagram of the internal structure of the second housing of the fresh air duct system provided in an embodiment of this application;

[0052] Figures 20-21 This is a diagram showing the internal gas flow of the fresh air duct system in the first scenario.

[0053] Figure 22 This is a schematic diagram of the internal structure of the second housing of the fresh air duct system provided in an embodiment of this application;

[0054] Figures 23-24 This is a diagram showing the internal gas flow of the fresh air duct system in the second scenario.

[0055] Figures 25-26 This is a diagram showing the internal gas flow of the fresh air duct system in the third scenario.

[0056] Figure 27 This is a schematic diagram of the internal structure of the second housing of the fresh air duct system provided in an embodiment of this application;

[0057] Figures 28-30 This is a diagram showing the internal gas flow of the fresh air duct system in the fourth scenario.

[0058] 100. Fresh air duct system; 200. Housing; 300. Fan blade volute; 301. Volute duct; 400. Air conditioner indoor unit; 102. External air outlet; 103. First internal air outlet; 105. Return air outlet; 106. Second internal air outlet; 1031. Fresh air direct air outlet; 1032. Air conditioner connection interface; 101. Volute through hole; 201. First housing; 202. Second housing; 203. Partition; 21. First sub-air outlet; 22. Second sub-air outlet; 23. First guide plate; 24. Second guide plate; 25. Narrowed guide plate; 26. Air inlet partition plate; 27. First air duct control valve; 28. Air cavity; 271. First air duct baffle; 272. Mounting hole; 31. Centrifugal fan; 32. Filter support; 34. Filter; 35. Return air guide plate; 36. Return air baffle; 37. Return air control valve; 40. Air duct outlet; 41. Fresh air duct; 43. Exhaust air duct; 44. Third air duct control valve; 45. Second rotating baffle; 46. Third rotating baffle; 47. First rotating baffle; 441. Third rotating baffle. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0060] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0061] For ease of description, spatial relative terms may be used in this text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptions used in this text have been explained accordingly.

[0062] Figures 1-4 This is a schematic diagram of the structure of the fresh air duct system provided in the embodiments of this application.

[0063] In this embodiment of the application, 100 is a fresh air duct system, such as... Figure 1 As shown, the fresh air duct system 100 may include: a housing 200 and a fan blade vortex housing 300. In this embodiment, the housing is provided with an external air vent 102 and at least one first internal air vent.

[0064] The external vent 102 is the interface for gas exchange between the fresh air duct system and the outside. When the fresh air duct system needs to supply fresh air to the room, the external vent 102 can act as the air inlet of the fresh air duct system, drawing air inward. When the fresh air duct system needs to exhaust air to the outside, the external vent 102 can also act as the air outlet of the fresh air duct system, exhausting air outward.

[0065] The fan blade volute 300 is disposed inside the outer casing 200. A volute duct is provided inside the fan blade volute 300. An air inlet is provided at the first end of the volute duct (the side closest to the external air outlet 102), and an air outlet 40 is provided at the second end. The first end of the volute duct is connected to the external air outlet via a first air outlet control valve 27; the second end of the volute duct is connected to the exhaust duct 43 and at least one of the first internal air outlets via a second air outlet control valve.

[0066] like Figure 17 As shown in this embodiment, the first internal air vent 103 includes: a fresh air direct air vent 1031 and an air conditioning connection interface 1032, and the second air duct control valve includes:

[0067] A first rotating partition 47, corresponding to the position of the fresh air direct blowing vent 1031, which can be closed or opened after rotation; a second rotating partition 45, corresponding to the position of the air conditioner interface 1032, which can be closed or opened after rotation; a third rotating partition 46, corresponding to the position of the exhaust duct 43, which can be closed or opened after rotation; and a second driving mechanism that drives the first rotating partition, the second rotating partition, and the third rotating partition respectively.

[0068] In addition, such as Figure 2 As shown, the outer casing 200 is provided with a second internal air outlet 106 that is connected to the volute air duct via a fourth air duct control valve (not shown in the figure). When the fourth air duct control valve is open, the second internal air outlet 106 is connected to the volute air duct. When the fourth air duct control valve is closed, the second internal air outlet 106 is separated from the volute air duct.

[0069] When using, such as Figure 4 and Figure 6 As shown, a centrifugal fan 33 can be installed inside the fan blade volute 300. When the centrifugal fan 33 rotates under the drive of a motor (not shown in the figure), the centrifugal fan 33 will drive the fan blade 31 to rotate, which will blow the air towards the air outlet 40 of the air duct. Then, a negative pressure will be generated in the air duct of the volute, so that the air is drawn in from the air inlet of the air duct. Finally, the air flows from the air inlet of the air duct to the air outlet of the air duct in the air duct of the volute.

[0070] like Figure 6 and Figure 16 As shown, the exhaust duct 43 is located between the outer wall of the fan blade volute 300 and the interior of the outer casing 200, and the exhaust duct 43 is separated from the volute duct, meaning they are independent of each other. From the figure, it appears that the exhaust duct 43 surrounds the outer side of one side of the fan blade volute 300. Figure 6 In the middle view, the inlet of the exhaust duct 43 is connected to the air outlet 40 of the volute duct, and the outlet of the exhaust duct 43 is connected to the external air outlet 102. This is equivalent to turning the air outlet 40 of the volute duct around the outer wall of the fan blade volute 300 back to the position of the external air outlet 102. That is, the exhaust duct 43 connects the second end (air outlet 40) of the volute duct to the external air outlet 102. A third air duct control valve 44 is provided in the exhaust duct 43.

[0071] In this embodiment, the gap between the outer wall of the fan blade vortex shell 300 and the inner wall of the outer shell 200 can be used as an exhaust channel, thus eliminating the need to set up a separate pipe as an exhaust duct.

[0072] In this embodiment, the first air duct control valve, the third air duct control valve, the fourth air duct control valve, and each of the second air duct control valves can all be controlled to be turned on or off. By controlling the on / off state of the first air duct control valve, the third air duct control valve, the fourth air duct control valve, and each of the second air duct control valves, in one scenario, an air intake channel can be formed along the direction of the external air outlet, the volute air duct, and at least one first internal air outlet; in another scenario, an exhaust channel can be formed along the direction of the second internal air outlet, the volute air duct, the exhaust air duct, and the external air outlet.

[0073] The fresh air duct system provided in this application embodiment has two independent volute ducts and an exhaust duct inside the outer casing. The exhaust duct can also connect the second end of the volute duct to an external air outlet. Therefore, in actual use, by controlling the opening and closing of the first, third, and fourth duct control valves, as well as each second duct control valve, an air intake duct can be formed along the direction of the external air outlet, the volute duct, and at least one first internal air outlet; or, an exhaust duct can be formed along the direction of the second internal air outlet, the volute duct, the exhaust duct, and the external air outlet. This allows for air intake and exhaust to be achieved using a single external air outlet, and the exhaust duct can be formed using the outer wall of the volute and the inner wall of the outer casing, eliminating the need for a separate exhaust duct and simplifying the structure.

[0074] When the temperature is low, the cold outdoor air blowing into the room will lower the indoor temperature. The first internal air vent 103 serves as an air outlet for blowing air into the room, considering that the fresh outdoor air can be blown into the room directly or after being heated. In this embodiment, there are two first internal air vents, and the second air duct control valve includes: a first rotating partition corresponding to the position of each first internal air vent, which can close or open the first internal air vent after rotation; a second rotating partition corresponding to the position of the first port of the exhaust air duct, which can close or open the first port of the exhaust air duct after rotation; and a second drive mechanism (which can be a drive motor or a telescopic cylinder) that drives the first rotating partition and the second rotating partition respectively.

[0075] In the embodiments of this application, such as Figure 6 As shown, the first internal air vent 103 can be set to two, including: a fresh air direct blowing vent 1031 and an air conditioning interface 1032. The position of the fresh air direct blowing vent 1031 corresponds to the air outlet 40 of the volute duct 301, so that the air outlet 40 of the volute duct can blow directly to the fresh air direct blowing vent 1031.

[0076] In addition, such as Figure 6As shown, a fresh air duct 41 is also provided inside the outer casing 200. The fresh air duct 41 is located between the outer wall of the fan blade volute 300 and the inner wall of the outer casing 200, and the fresh air duct 41 is directly separated from the volute duct, that is, the fresh air duct 41 and the volute duct are independent of each other. Figure 5 In the diagram, the fresh air duct 41 and the exhaust air duct 43 are located on either side of the air outlet 40 of the volute duct. One end of the fresh air duct 41 (the right end in the diagram) is connected to the air outlet 40 of the volute duct via a second duct control valve, while the other end (the left end in the diagram) serves as an air conditioning interface 1032, facilitating the introduction of air from the air outlet of the volute duct into the air conditioning interface 1032. In actual use... Figure 8 and Figure 9 As shown, the indoor unit 400 of the air conditioner is provided with an air outlet duct 401. The air conditioner interface 1032 can be used as the air inlet of the indoor unit 400 in actual use. The air conditioner interface 1032 is connected to the air outlet duct 401, so that the air from the air outlet 40 of the volute air duct can be introduced into the indoor unit 400.

[0077] In one embodiment of this application, such as Figure 2 As shown, the outer casing 200 may include: a first casing 201 and a second casing 202.

[0078] The first housing 201 and the second housing 202 are arranged in two layers and are separated from each other, such as Figure 4 and Figure 5 As shown, the first housing 201 and the second housing 202 are separated from each other by a partition 203. The first housing 201 and the second housing 202 are connected by a vortex-type through-hole 101, as shown. Figure 5 As shown, the volute through hole 101 is provided on the partition plate 203.

[0079] Both the vortex duct and the exhaust duct 43 are disposed in the second housing 202. The vortex duct is located in the second housing and is connected to the vortex through hole 101.

[0080] In one embodiment of this application, such as Figure 4 As shown, an air cavity 28 is provided on one side (left side of the figure) of the first housing 201 and the second housing 202. The air cavity 28 is located on the left side, meaning there is a gap between the partition 203 of the first housing 201 and the second housing 202 and the outer shell 200 on the left side; the location of this gap is the location of the air cavity 28. The air cavity 28 is connected to the space of the first housing 201 through a first air duct control valve 27; the air cavity 28 is connected to the second end of the exhaust air duct 43 through a third air duct control valve 44. Figure 7The air cavity 28 is connected to the right side of the second housing 202, meaning that the air cavity 28 is not connected to the vortex air duct in the second housing 202.

[0081] By setting up air cavities, such as Figure 16 As shown, the air cavity 28 can selectively connect with the space of the first housing (the space in the first housing is connected to the volute duct 301 through the volute through-hole, i.e., the air cavity is connected to the volute duct) or the space of the exhaust duct. In one scenario, the first duct control valve can be turned on and the third duct control valve can be turned off, so that the air cavity is only connected to the volute duct 301. In another scenario, the first duct control valve can be turned off and the third duct control valve can be turned on, so that the air cavity and the exhaust duct are connected.

[0082] In this embodiment of the application, the air cavity 28 is connected to one of the two air ducts (exhaust duct and volute duct), and the connection is controlled by the first air duct control valve and the third air duct control valve.

[0083] like Figure 12 and Figure 13 As shown, the external air vent 102 is disposed on one side of the housing 200. Considering the uniformity and stability of the external air vent 102 during air intake, in one embodiment of this application, as... Figure 12 and Figure 13 As shown, the external air vent 102 includes a first sub-air vent 21 and a second sub-air vent 22. A reference baseline is defined on the outer casing 200. The reference baseline is the projection line of the axis of the vortex through hole on the side of the outer casing 200 where the external air vent 102 is located. The first sub-air vent 21 and the second sub-air vent 22 are symmetrically arranged on both sides of the reference baseline (symmetrically arranged along the dotted line in the figure). The shape, size and area of ​​the first sub-air vent 21 and the second sub-air vent 22 are the same. This makes the space inside the first casing 201 symmetrical with respect to the first sub-air vent 21 and the second sub-air vent 22. Therefore, when air is introduced, the air flowing into the first casing 201 from the first sub-air vent 21 and the second sub-air vent 22 is uniform and stable.

[0084] In the embodiments of this application, such as Figure 13 As shown, at least one first guide vane 23 is provided on the first sub-air outlet 21; at least one second guide vane 24 is provided on the second sub-air outlet 22; the number of first guide vanes 23 and second guide vanes 24 are equal, and the tilt angles of the first guide vanes 23 and the second guide vanes 24 are symmetrically arranged. Figure 13As shown in the embodiment of this application, there are three first guide plates 23 and three second guide plates 24. The angle between the first guide plate 23 and the inner surface of the first housing 201 is α, and the angle between the second guide plate 24 and the inner surface of the first housing 201 is b. α and b are equal.

[0085] In another embodiment of this application, such as Figure 14 As shown, an air inlet partition 26 is provided inside the first housing 201; the air inlet partition 26 divides the space inside the first housing 201 into two parts in the direction perpendicular to the air inlet of the external air vent 102 (e.g., Figure 11 As shown, the distances from the air inlet partition plate 26 to the two sides of the first housing 201 are D1 and D2, respectively (where D1 and D2 are equal), and the center points of the first sub-air vent 21 and the second sub-air vent 22 are located on the extension line of the air inlet partition plate 26 (the dotted line in the figure shows the extension line).

[0086] In another embodiment of this application, a first guide plate 23, a second guide plate 24, and an air inlet partition plate 26 can be provided simultaneously. Their functions are all to make the air in the first sub-air inlet 21 and the second sub-air inlet 22 more uniform, and to avoid turbulence between different sub-air inlets, which would affect the air intake.

[0087] In another embodiment of this application, such as Figure 14 and Figure 15 As shown, two constricted guide plates 25 are symmetrically arranged inside the air cavity 28, with one end of each constricted guide plate 25 adhering to the inner wall of the outer casing 200. Along the direction from the external air vent towards the interior of the first casing 201, the two constricted guide plates 25 are arranged in an arc shape, so that the air entering from the external air vent is concentrated and blown into the first casing. Figure 15 As shown, the arc length of the left constricted guide plate 25 is L1, and the minimum distance between the left constricted guide plate 25 and the left side of the air cavity 28 is L. In this embodiment, L is greater than L1, so that the left constricted guide plate 25 will not block the exhaust when the exhaust channel is exhausting.

[0088] In another embodiment of this application, such as Figure 5As shown, the first air duct control valve 27 includes: a first air duct baffle 271 and a first drive mechanism (not shown in the figure). A mounting hole 272 is provided on the baffle 203 between the first housing and the second housing. The first air duct baffle 271 is disposed in the mounting hole 272. The first drive mechanism can drive the first air duct baffle 271 to move in the mounting hole 272. The first air duct baffle 271 is moved into the first housing 201. The external air outlet 102 is separated from the interior space of the first housing 201. The first air duct baffle 271 is moved into the second housing 202. The external air outlet 102 is connected to the interior space of the first housing 201.

[0089] In the embodiments of this application, such as Figure 7 As shown, the third air duct control valve 44 includes: a third rotating baffle 441 and a third drive mechanism (not shown in the figure), wherein the third rotating baffle 441 is disposed between the air cavity 28 and the second port located in the exhaust air duct 43. Figure 7 (on the right side of the central exhaust duct 43), the third rotating baffle 441 can rotate under the drive of the third driving mechanism to close or open the exhaust duct 43.

[0090] like Figure 4 and Figure 6 As shown, the fresh air duct system also includes a return air inlet 105. The return air inlet 105 is located on the side of the first housing 201, and is on a different side from the external air inlet 102. A return air channel is provided in the first housing 201, and a return air baffle 36 is provided in the first housing 201, dividing the interior of the first housing 201 into two parts. The return air channel is connected to the volute through-hole; see also... Figure 22 As shown, there are at least two return air baffles 36. These two return air baffles 36 can be closed or opened under the drive of a return air baffle drive mechanism (not shown in the figure). Figure 4 The return air baffle is closed, separating the return air inlet 105 from the volute through-hole 101; as Figure 22 As shown, the two return air baffles 36 can be opened to connect the return air passage with the volute through hole 101.

[0091] In the embodiments of this application, such as Figure 4 As shown, a filter support 32 is also provided outside the volute through-hole 101, and a filter 34 is provided on the filter support 32 for filtering the gas flowing through the volute through-hole. This includes filtering not only the air entering from the external air inlet 102, but also the air entering from the return air inlet 105. A return air guide plate 35 is also provided on the return air inlet, which can close or open the return air inlet.

[0092] In addition, to reduce the vibration of the fresh air direct air outlet 1031, such as Figure 3 As shown, a sponge 107 is also installed outside the fresh air direct air outlet 1031.

[0093] In practical applications, this air duct system can be used in the following scenarios:

[0094] Scenario 1: Direct Fresh Air Flow

[0095] In a scenario where fresh air is directly blown in, the goal is to introduce outdoor fresh air into the fresh air inlet 1031. (See...) Figure 18 and Figure 19 As shown in the figure, the return air guide plate 35 is closed to prevent air from flowing in from the return air guide plate 35, the first air duct control valve 27 is opened so that the air entering from the external air vent 102 can enter the volute air duct, the second rotating baffle 45 is closed to close the fresh air duct 41 leading to the indoor unit of the air conditioner, and the third rotating baffle 46 is closed to close the exhaust air duct 43.

[0096] See Figure 20 and Figure 21 As shown, fresh outdoor air can enter through the external air vent 102 and be directly blown into the room through the fresh air direct air vent 1031, thus performing fresh air direct air supply.

[0097] Scenario 2: Fresh air passes through the indoor unit and is blown out.

[0098] When it is necessary to supply air into a room, and the temperature difference between the outdoor fresh air and the indoor temperature is significant, directly blowing the outdoor fresh air into the room through the fresh air direct-flow vent 1031 will cause a large change in the indoor temperature. For example, in winter, cold fresh air entering a warm room will lower the indoor temperature; conversely, in summer, hot fresh air blowing in a cold room will raise the indoor temperature. Therefore, in Scenario 2 of this application, it is necessary to avoid using the fresh air direct-flow vent 1031 to directly blow air into the room.

[0099] See Figure 18 and Figure 22 As shown in the figure, the return air guide plate 35 is closed to prevent air from flowing in from the return air guide plate 35, the first air duct control valve 27 is opened so that the air entering from the external air vent 102 can enter the volute air duct, the first rotating baffle 47 is closed so that the fresh air direct blowing air vent 1031 is closed, and the third rotating baffle 46 is closed so that the exhaust air duct 43 is closed.

[0100] See Figure 23 and Figure 24As shown, fresh outdoor air can enter from the external air vent 102 and be blown directly into the indoor unit (ducted air conditioner) from the fresh air direct air vent 1032. After the temperature is adjusted by the indoor unit, it is blown into the room (e.g., the indoor unit heats the colder fresh air, or the indoor unit cools the hotter fresh air).

[0101] Scenario 3: Return Air Filtration

[0102] The fresh air system can also circulate and filter indoor air. The embodiment of this application provides scenario three, which involves circulating indoor air.

[0103] See Figure 5 and Figure 22 As shown in the figure, the return air guide plate 35 and the return air baffle are opened, and the first air duct control valve 27 is closed, preventing air entering from the external air vent 102 from entering the volute air duct, while allowing air from the return air guide plate 35 to enter the volute air duct. Additionally, the first rotating baffle 47 is closed to close the fresh air direct-blowing vent 1031, and the third rotating baffle 46 is closed to close the exhaust air duct 43.

[0104] See Figures 23-26 As shown, indoor air can enter the volute duct from the return air guide plate and blow directly into the indoor air conditioning unit (duct unit) from the fresh air direct air outlet 1032. After the indoor air conditioning unit adjusts the temperature, it is blown into the room to form an internal circulation.

[0105] Scenario 4: Ventilation Scenario

[0106] The fresh air system can also exhaust indoor air to the outside. The embodiment of this application provides scenario three, in which indoor air is exhausted to the outside.

[0107] See Figure 5 and Figure 27 As shown in the figure, the return air guide plate 35 and the return air baffle 36 are closed, while the fourth air duct control valve is opened, allowing the second internal air outlet 106 to directly connect with the volute air duct. Additionally, the first air duct control valve 27 is closed, preventing air entering from the external air outlet 102 from entering the volute air duct. Furthermore, the first rotating baffle 47 is closed, closing the fresh air direct air outlet 1031, and the second rotating baffle 45 is closed, closing the fresh air duct 41. The second air duct control valve 56 and the fourth air duct control valve are opened, opening the exhaust air duct 43 and connecting it to the ventilation chamber.

[0108] See Figures 28-30As shown, indoor air can enter the vortex duct from the second internal air vent 106, and return to the air cavity 28 from the exhaust duct 43, and then be blown to the outside through the external air vent 102 connected to the air cavity.

[0109] In this application embodiment, a fresh air system is also provided, such as Figure 4 As shown, it includes a centrifugal fan 31 and a fresh air duct system as provided in any of the foregoing embodiments, wherein the centrifugal fan 31 is installed inside the fan blade volute 300.

[0110] In this application embodiment, an air conditioner is also provided, such as Figure 8 and Figure 9 As shown, the air system includes the fresh air system provided in any of the foregoing embodiments, wherein the air inlet of the indoor unit 400 of the air conditioner is connected to a first internal air vent. Figure 8 and Figure 9 As shown, the first internal air vent is 1032.

[0111] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0112] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0113] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A fresh air duct system, characterized in that, The fresh air duct system includes: an outer shell and a fan blade vortex shell; wherein, the outer shell is provided with an external air outlet and at least one first internal air outlet; The fan blade volute is located inside the outer shell, and a volute air duct is provided inside the fan blade volute. An exhaust air duct is provided between the outer wall of the volute and the inner wall of the outer shell, which is separated from the volute air duct. A second internal air outlet is provided on the outer shell and is connected to the volute air duct through a fourth air duct control valve. The first end of the vortex-shaped air duct is connected to the external air outlet through a first air duct control valve; the second end of the vortex-shaped air duct is connected to the exhaust air duct and at least one of the first internal air outlets through a second air duct control valve. The exhaust duct connects the second end of the vortex duct to an external air outlet, and a third duct control valve is installed inside the exhaust duct. By controlling the opening or closing of the first air duct control valve, the third air duct control valve, the fourth air duct control valve, and each second air duct control valve, an air intake channel can be formed along the direction of the external air outlet, the volute air duct, and at least one first internal air outlet; or, an exhaust channel can be formed along the direction of the second internal air outlet, the volute air duct, the exhaust air duct, and the external air outlet.

2. The fresh air duct system according to claim 1, characterized in that, The outer shell includes a first shell and a second shell that are arranged in two layers and separated from each other. The first shell and the second shell are connected by a vortex shell through hole. The vortex shell air duct and the exhaust air duct are both arranged in the second shell. The vortex shell air duct is located in the second shell and is connected to the vortex shell through hole. A wind cavity is provided on one side of the first housing and the second housing. The wind cavity is connected to the space of the first housing through a first air duct control valve. The wind cavity is connected to the second end of the exhaust air duct through a third control valve.

3. The fresh air duct system according to claim 2, characterized in that, The external air outlet includes: a first sub-air outlet and a second sub-air outlet arranged symmetrically; The first sub-air outlet is provided with at least one first guide plate; the second sub-air outlet is provided with at least one second guide plate; the number of the first guide plate and the second guide plate are equal, and the tilt angles of the first guide plate and the second guide plate are symmetrically arranged. And / or, an air inlet partition plate is provided inside the first housing; the center points of the first sub-air inlet and the second sub-air inlet are located on the extension line of the air inlet partition plate.

4. The fresh air duct system according to claim 2, characterized in that, Two constricted guide plates are symmetrically arranged inside the air cavity, pointing towards the inside of the first housing along the direction of the external air vent. The two constricted guide plates are arranged in an arc shape so that the air entering from the external air vent is gathered and blown into the first housing.

5. The fresh air duct system according to claim 2, characterized in that, The first air duct control valve includes: a first air duct baffle and a first drive mechanism. A mounting hole is provided on the baffle between the first housing and the second housing. The air duct baffle is disposed in the mounting hole. The first drive mechanism can drive the first air duct baffle to move in the mounting hole. The first air duct baffle is moved into the first housing. The external air outlet is separated from the interior space of the first housing. The first air duct baffle is moved into the second housing. The external air outlet is connected to the interior space of the first housing.

6. The fresh air duct system according to claim 2, characterized in that, The first internal air vent includes: a fresh air direct air vent and an air conditioning connection interface; the second air duct control valve includes: A first rotating partition that corresponds to the position of the fresh air direct blowing vent and can be closed or opened after being rotated; A second rotating partition, corresponding to the position of the air conditioner interface, which can be closed or opened by rotating; A third rotating partition, corresponding to the position of the exhaust duct, which can be closed or opened when rotated; A second driving mechanism that drives the first rotating partition, the second rotating partition, and the third rotating partition respectively.

7. The fresh air duct system according to claim 6, characterized in that, The third air duct control valve includes a third rotating baffle and a third driving mechanism. The third rotating baffle is disposed between the air cavity and the second port located in the exhaust air duct. The third rotating baffle can rotate under the drive of the third driving mechanism to close or open the exhaust air duct.

8. The fresh air duct system according to claim 2, characterized in that, The fresh air duct system also includes: a return air inlet; The return air vent is located on the side of the first housing, and the return air vent and the external air vent are on different sides; The first housing is provided with a return air channel, which is connected to the vortex shell through hole; the return air channel is provided with a return air duct control valve to control the closing or opening of the return air channel.

9. A fresh air system, characterized in that, It includes a centrifugal fan and a fresh air duct system as described in any one of claims 1-8, wherein the centrifugal fan is installed inside the fan blade volute.

10. An air conditioner, characterized in that, The system includes the fresh air system as described in claim 9, wherein the air inlet of the indoor unit of the air conditioner is connected to a first internal air vent.

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