Ducted fan

Abstract

The utility model relates to a kind of ducted fan, belong to air conditioning technical field, ducted fan includes shell and fresh air module, first air port, second air port and indoor air inlet are equipped on shell;Fresh air module includes fan, centrifugal fan, centrifugal fan is located in the shell, in fresh air mode, centrifugal fan brings outdoor air into shell from first air port by rotation, and second air port is brought into indoor;In exhaust mode, centrifugal fan brings indoor air into shell from indoor air inlet by rotation, and exhaust from first air port to outdoor;Centrifugal fan includes volute and wind scooper, volute is equipped with volute air inlet;Wind scooper is located at volute air inlet, and wind scooper center protrudes to the side away from volute along its axis center.The application is installed with the wind scooper that relative plane center protrudes at volute air inlet, guides airflow to enter volute, so that volute air intake increases, simultaneously destroys vortex formation condition, reaches the effect of optimizing wind field, reduces vortex, reduces noise.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and more particularly to a ducted air conditioner. Background Technology

[0002] Currently, with the widespread adoption of air conditioning, ducted air conditioners are popular among users due to their advantages such as concealed installation and gentle, even airflow, and are widely used in central air conditioning systems. In existing technology, ducted air conditioners generally include a fresh air module, which is used to deliver outdoor air into the room to improve indoor air quality.

[0003] In fresh air modules, to avoid insufficient air intake from the fan and affecting the air conditioning's ventilation efficiency, air guide covers are generally not installed at the fan's air inlet. A few manufacturers, however, install flat air guide covers at the fan's air inlet to prevent foreign objects from entering the fan through the air inlet and reduce the risk of fan damage.

[0004] However, the absence of a shroud or the use of a flat shroud at the fan inlet creates a large vortex area, preventing air from entering and reducing the fan's airflow. As the vortex rotates, it constantly collides with the surrounding environment, causing the fan to generate significant noise during operation and negatively impacting the user experience. Utility Model Content

[0005] This application addresses, to at least some extent, one of the technical problems in the related art.

[0006] Therefore, this application aims to provide a ducted air conditioner that provides a large-flow inlet for fresh air by installing a guide shroud with a relatively flat, centrally protruding shape at the air inlet of the volute. This facilitates the guidance of airflow into the volute, increases the air volume entering the volute, and simultaneously disrupts the conditions for vortex formation, thereby optimizing the air field, reducing vortices, and lowering noise.

[0007] To achieve the above objectives, this application provides a duct air handling unit, comprising: The housing includes a first side plate, a second side plate, and a bottom plate arranged adjacent to each other, and the housing further includes: The first air vent is located on the first side panel; The second air vent is located on the second side panel; An indoor air inlet is located on the base plate; The fresh air module includes: A filter screen, which is disposed inside the housing, is used to filter outdoor air; A centrifugal fan is installed inside the casing. When the ducted air conditioner is in fresh air mode, the centrifugal fan draws outdoor air into the casing from the first air inlet and into the room from the second air inlet. When the ducted air conditioner is in exhaust mode, the centrifugal fan draws indoor air into the casing from the indoor air inlet and exhausts it to the outside from the first air inlet. The centrifugal fan includes: The volute is provided with a volute air inlet; The fan is housed inside the volute. An air guide shroud is provided at the air inlet of the volute, and the center of the air guide shroud protrudes away from the volute along its axis.

[0008] In the technical solution, by setting the air guide shroud to protrude, the space between the volute air inlet and the casing is compressed by the air guide shroud, thereby disrupting the environment for vortex generation, reducing the number and volume distribution of air intake vortices, thus reducing the impact of vortices on the surrounding environment and reducing the noise caused by vortices; since the air guide shroud is arched as a whole, its shape and structure follow the natural flow direction of the wind field, thereby disrupting the conditions for the formation of a boundary layer on the surface of the volute air inlet, readjusting and optimizing the wind field flow direction, and increasing the air intake volume at the volute air inlet.

[0009] In some embodiments of this application, the air guide shroud includes: A first cover portion, the first cover portion protruding along its axis toward the side away from the volute; The second cover portion is connected to the first cover portion on the side near the air inlet axis of the volute. The axial direction of the volute air inlet is defined as the height direction of the air guide shroud. At the same distance from the axis, the height of the second shroud is lower than the height of the first shroud, and the first shroud is closer to the indoor air inlet than the second shroud.

[0010] In the technical solution, the air guide hood is designed into a first hood section and a second hood section, with the height of the first hood section being greater than that of the second hood section. The first hood section is positioned close to the indoor air inlet, so that during the process of exhausting indoor air to the outside, indoor air enters the volute air inlet from the first hood section. The first hood section compresses the vortex formation space, thereby allowing airflow to enter the volute air inlet more smoothly. The second hood section is positioned close to the filter, so that during the process of outdoor air entering the room, since the outdoor air is first filtered by the filter, the filter increases the air intake resistance. Therefore, the height of the second hood section is set lower to reduce the resistance of airflow entering the volute air inlet. At the same time, the first and second hood sections together compress the space between the volute air inlet and the casing, thereby disrupting the vortex formation environment, reducing the size and number of vortices, suppressing the generation of large-scale vortices, thereby increasing the fresh air intake volume and reducing aerodynamic noise.

[0011] In some embodiments of this application, the filter screen is disposed on the side of the volute near the air guide shroud, and the second shroud portion is closer to the filter screen relative to the first shroud portion.

[0012] In the technical solution, by placing the second cover close to the filter, that is, by placing the second cover on the windward side where outdoor air enters, the outdoor air is first filtered by the filter. Since the filter increases the airflow resistance of the outdoor air, by setting the second cover, the resistance encountered by the airflow when entering the volute air inlet is reduced, ensuring that most of the airflow can be efficiently drawn in; at the same time, the airflow follows the second cover into the volute air inlet, reducing the possibility of airflow vortex generation and reducing turbulence noise caused by changes in airflow speed.

[0013] In some embodiments of this application, the height of the air guide shroud gradually decreases from the central axis to the surrounding area.

[0014] In the technical solution, by further defining the overall shape of the air guide shroud, a curved surface with a high center and low perimeter is formed. This effectively disperses and transmits the negative air pressure acting on its surface evenly to the surrounding fixed boundaries, improving the structural stability of the air guide shroud. Compared to the protruding structure of the first plane, the air guide shroud compresses the vortex formation space, thereby disrupting the original vortex formation space at the air inlet of the volute. This causes the originally larger vortices to be compressed into smaller vortices, and the smaller vortices can attenuate more quickly, thus achieving the effect of reducing vortex noise.

[0015] In some embodiments of this application, the height of the air guide shroud is set to h, where h > 0 mm and h ≤ 40 mm.

[0016] In the technical solution, by limiting the height of the air guide shroud on the first plane, the air guide shroud can control its production cost while achieving the goal of disrupting vortex formation, increasing air intake, and reducing noise when its height is within a certain range.

[0017] In some embodiments of this application, the fresh air module includes a mounting plate formed along the outer periphery of the air guide shroud and detachably connected to the volute.

[0018] In the technical solution, the mounting plate and the outer wall of the volute are made detachable to facilitate the replacement of the air guide cover by the staff, thereby improving the maintenance efficiency of the air guide cover.

[0019] In some embodiments of this application, the volute is provided with a limiting part, which is used to restrict the movement of the mounting plate on the outer wall of the volute near the air guide shroud; A connector, which passes through the mounting plate and the side wall of the volute, is used to fix the mounting plate and the volute to restrict the movement of the mounting plate in a plane perpendicular to the fan axis.

[0020] In the technical solution, by setting a limiting part and a connector, the mounting plate can be quickly positioned on the outer wall of the volute. Then, the workers can use the connector to fix the mounting plate on the outer wall of the volute, thereby improving the assembly efficiency of the mounting plate.

[0021] In some embodiments of this application, the limiting portion includes: First limiting reinforcement; The second limiting rib has a length direction perpendicular to the length direction of the first limiting rib. The first limiting rib and the second limiting rib abut against the two side walls of the mounting plate that are perpendicular to each other, thereby restricting the movement of the mounting plate in two mutually perpendicular directions.

[0022] In the technical solution, by setting a first limiting rib and a second limiting rib, and limiting the length directions of the first limiting rib and the second limiting rib to be perpendicular to each other, the position of the mounting plate on the two-dimensional plane is limited. During assembly, the worker moves the mounting plate on the outer wall of the volute so that the side wall of the mounting plate abuts against the first limiting rib and the second limiting rib respectively. Then, the mounting plate is fixed to the outer wall of the volute by the connector, thereby improving the assembly efficiency.

[0023] In some embodiments of this application, the first or second limiting rib is provided with a limiting buckle, the limiting buckle and the connecting member are disposed opposite to each other on both sides of the air inlet of the volute, and the limiting buckle is used to restrict the movement of the mounting plate on a plane perpendicular to the fan axis.

[0024] In the technical solution, by setting a limiting buckle, the worker can move the mounting plate to abut against the side wall of the first limiting rib during assembly. At this time, the limiting buckle is located on the side of the mounting plate away from the outer wall of the volute, thereby fixing the position of the mounting plate in the direction perpendicular to the outer wall of the volute and fixing the position of the mounting plate in three-dimensional space.

[0025] In some embodiments of this application, the air guide shroud includes: Multiple first connecting ribs extend in a ring along the circumference of the air guide shroud and are arranged radially along the air guide shroud; Multiple second connecting ribs extend radially and are arranged circumferentially along the air guide shroud. Multiple first connecting ribs and multiple second connecting ribs intersect and connect to form a mesh structure; the sides of the first connecting ribs away from the axis... The end of the first connecting rib away from the volute is defined as the first end, and the end of the first connecting rib close to the volute is defined as the second end. The first connecting rib is inclined from the first end to the second end in a direction close to the axis of the air guide shroud. A first included angle γ is formed between the side of the first connecting rib away from the axis and the plane perpendicular to the axis direction, where γ > 0° and γ ≤ 90°.

[0026] In the technical solution, the first annular surface protrudes away from the axis, so that when the airflow hits the side of the first annular surface closer to the axis, the airflow can enter the volute air inlet more smoothly under the guidance of the first annular surface, thereby optimizing the wind field, reducing the number and size of generated air, and thus increasing the air intake of the volute and reducing the noise generated by the collision of vortices with the surrounding environment.

[0027] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure according to the embodiments of this application; Figure 2 This is a top view of the structure according to an embodiment of this application; Figure 3 This is a schematic diagram of the filter plate and air guide shroud according to an embodiment of this application; Figure 4 This is a schematic diagram showing the position of the air guide shroud relative to the first air outlet and the second air outlet according to an embodiment of this application; Figure 5 This is a schematic diagram of the internal structure of the volute according to an embodiment of this application; Figure 6 This is a schematic diagram of the outdoor air exhaust path according to an embodiment of this application; Figure 7 This is a schematic diagram of the indoor air exhaust path according to an embodiment of this application; Figure 8 This is a schematic diagram of the overall structure of the air guide shroud according to an embodiment of this application; Figure 9 This is a cross-sectional structural schematic diagram of the air guide shroud according to an embodiment of this application; Figure 10 This is a schematic diagram of the structure of the first cover portion and the second cover portion according to an embodiment of this application; Figure 11 This is a cross-sectional structural schematic diagram of the air guide shroud according to an embodiment of this application; Figure 12 This is a front view of the overall structure according to an embodiment of this application; Figure 13 According to the embodiments of this application Figure 5 Schematic diagram of the AA section; Figure 14 This is a schematic diagram of the connection structure between the mounting plate and the outer wall of the volute according to an embodiment of this application; Figure 15 This is a schematic diagram of the connection structure of the reinforcing rib according to an embodiment of this application.

[0029] In the above figures: 100, housing; 200, volute; 300, air guide shroud; 400, mounting plate; 500, filter screen; 600, wind deflector; 101. First air vent; 102. Second air vent; 103. Indoor air inlet; 104. First air damper; 105. Volute fresh air inlet; 106. Second air damper; 107. Volute air outlet; 108. Third air damper; 109. Ventilation vent; 110. Fourth air damper 301. First connecting rib; 302. Second connecting rib; 303. First annular surface; 304. Reinforcing rib; 305. First cover part; 306. Second cover part; 307. First rib; 308. Second rib; 309. Third rib; 310. Fourth rib; 311. Connecting surface; 312. Reinforcing rib; 401. Connector; 402. First limiting rib; 403. Limiting buckle; 404. Second limiting rib. Detailed Implementation

[0030] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0031] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments. In the following, embodiments of this application will be described in detail with reference to the accompanying drawings. As attached Figures 1 to 7 As shown in an illustrative embodiment of the duct air conditioner of this application, the duct air conditioner may include a housing 100, which is used to form the overall appearance of the duct air conditioner.

[0032] In some embodiments, the housing 100 may include two first side panels, which are disposed opposite each other.

[0033] In some embodiments, the housing 100 may include a second side plate, which is connected to one side of the first side plate. Two second side plates are arranged opposite each other, and the first side plate and the second side plate together enclose the four side walls of the housing 100.

[0034] In some embodiments, the housing 100 may include a base plate, which is fixedly connected to a first side plate and a second side plate, and the extension direction of the base plate is perpendicular to the extension direction of the first side plate and the second side plate.

[0035] In some embodiments, the housing 100 may include a top plate, which is disposed opposite to the bottom plate. The top plate is fixedly connected to a first side plate and a second side plate. The first side plate, the second side plate, the bottom plate, and the top plate together enclose the overall appearance of the duct machine.

[0036] In some embodiments, a first air vent 101 is provided on the first side panel, the first air vent 101 being used to communicate with the outside so as to exchange fresh air with the outside.

[0037] Under normal circumstances, the first air outlet 101 is connected to a fresh air duct, which connects to the outside, so that the duct air conditioner can introduce fresh outdoor air into the room, increase the indoor oxygen content, and improve the indoor air quality; and exhaust the indoor stale air to the outside, so as to realize indoor and outdoor ventilation.

[0038] In some embodiments, a second air vent 102 is provided on the second side panel, the second air vent 102 is connected to the interior, and outdoor air enters the interior through the second air vent 102.

[0039] Under normal circumstances, the second air vent 102 is close to the indoor return air vent that is pre-installed on the ceiling, or, according to design requirements, the second air vent 102 is connected to a return air duct that guides the air to a distant return air vent, so as to ensure that the fresh air entering from the first air vent 101 enters the room through the second air vent 102 and avoids airflow short-circuiting.

[0040] In some embodiments, an indoor air inlet 103 is provided on the base plate, which serves as a channel for allowing indoor air to enter the housing 100. A first damper 104 is provided at the indoor air inlet 103, which is used to control the opening and closing of the channel for indoor air to enter the housing 100.

[0041] In some embodiments, the ducted air conditioner may include a fresh air module, which is used to drive the exchange of outdoor air and indoor air, providing power for the fresh air exchange.

[0042] In some embodiments, the fresh air module may include a centrifugal fan disposed within the housing 100. When the ducted air conditioner is in fresh air mode, the centrifugal fan draws outdoor air into the housing 100 from the first air inlet 101 and into the room from the second air inlet 102. When the ducted air conditioner is in exhaust mode, the centrifugal fan draws indoor air into the housing 100 from the indoor air inlet 103 and exhausts it to the outside from the first air inlet 101, thereby improving indoor air quality.

[0043] In some embodiments, the fresh air module may include a filter 500 disposed inside the housing 100. The filter 500 is used to filter outdoor air and improve the air quality of outdoor air entering the room.

[0044] In some embodiments, as shown in the appendix Figure 2 As shown, the centrifugal fan may include a volute 200, which has a volute inlet. The volute 200 is used to guide the airflow direction, causing it to flow along the wall of the volute 200 and finally out through the volute outlet.

[0045] In some embodiments, the centrifugal fan may include a fan disposed inside the volute 200, which drives airflow by rotating to bring fresh air into the room.

[0046] In some embodiments, the volute 200 is provided with a volute fresh air inlet 105, which is connected to a first air outlet 101. A second damper 106 is provided at the volute fresh air inlet 105, which is used to control the connection and disconnection between the volute fresh air inlet 105 and the first air outlet 101, thereby controlling whether the volute 200 is connected to the outside.

[0047] In some embodiments, the volute 200 is provided with a volute air outlet 107, which is connected to a second air outlet 102. A third damper 108 is provided at the volute air outlet 107, which is used to control the opening and closing of the volute air outlet 107 and the second air outlet 102, thereby controlling whether the volute 200 is connected to the room.

[0048] In some embodiments, as shown in the appendix Figure 5 To be continued Figure 7As shown, the centrifugal fan may include an air exchange port 109. A baffle plate 600 is provided between the side of the volute 200 near the second air inlet 102 and the inner wall of the casing 100. The air exchange port 109 is located on the baffle plate 600 and is situated on the side of the volute air inlet near the first air inlet 101 and the second air inlet 102. The air exchange port 109 is used to achieve separate exhaust during the air intake and exhaust processes of the centrifugal fan. A fourth damper 110 is provided at the air exchange port 109 to control the opening and closing of the air exchange port 109.

[0049] In some embodiments, an exhaust channel is formed inside the volute 200 between the volute fresh air inlet 105 and the volute air outlet 107. When indoor air is exhausted to the outside, the third damper 108 closes, blocking the volute air outlet 107 from the second air outlet 102. Indoor air enters the volute 200 through the indoor air inlet 103 via the first cover portion 305, and is exhausted to the outside through the exhaust channel from the volute fresh air inlet 105 and the first air outlet 101. When outdoor air enters the room, the volute air outlet... The first air vent 107 is connected to the second air vent 102, and the third air damper 108 blocks the exhaust channel. Outdoor air enters the volute 200 through the first air vent 101 and the fresh air vent 105. At this time, the ventilation port 109 is opened. Due to the blockage of the exhaust channel, outdoor air is discharged to the outside of the volute 200 through the ventilation port 109, and re-enters the volute 200 through the filter 500 and the second cover part 306. It then enters the room through the volute air outlet 107 and the second air vent 102 to improve the indoor air quality.

[0050] In related technologies, the air inlet of the volute is either not equipped with a guide shroud 300, or is equipped with a guide shroud 300 with a planar mesh structure, to prevent debris from falling into the volute 200 from the air inlet and affecting the normal operation of the centrifugal fan. However, in both of these structures, a relatively large vortex area is easily formed at the air inlet of the volute during air intake, and the vortex intensity in this area is high, making it impossible for air to flow into the volute 200 from this area, resulting in a loss of intake air volume in this area; at the same time, because the airflow molecules in the vortex will collide with the surface of surrounding objects during movement, the frequency and intensity of the collisions are relatively high during the operation of the centrifugal fan, resulting in greater noise and affecting the user experience.

[0051] Based on this, this application provides a gradual flow path for fresh air to enter the volute air inlet by setting a guide hood 300 that protrudes relative to the plane at the volute air inlet, reducing vortex blockage and thus reducing the impact of the guide hood 300 on the wind resistance at the volute air inlet, while increasing the air volume of the guide hood 300. At the same time, since the guide hood 300 compresses the vortex formation space, it disrupts the vortex generation environment, thereby readjusting and optimizing the airflow direction, reducing the number and volume distribution of the incoming vortex, thus reducing the impact of the vortex on the surrounding environment and reducing the noise caused by the vortex.

[0052] In some embodiments, as shown in the appendix Figure 2 and attached Figure 8 As shown, the air guide shroud 300 is located at the air outlet of the volute. The center of the air guide shroud 300 protrudes along its axis towards the side away from the volute 200. By setting the air guide shroud 300 to protrude, the space between the air inlet of the volute and the housing 100 is compressed by the air guide shroud 300, thereby disrupting the environment for vortex generation, reducing the number and volume distribution of the intake vortices, thus reducing the impact of the vortices on the surrounding environment and reducing the noise caused by the vortices. Since the air guide shroud 300 is arched in shape, it disrupts the conditions for the formation of a boundary layer on the surface of the air inlet of the volute, readjusts and optimizes the airflow direction, and increases the intake air volume at the air inlet of the volute.

[0053] In some embodiments, the air guide shroud 300 may include a plurality of first connecting ribs 301, the first connecting ribs 301 extending in a ring shape along the circumference of the air guide shroud 300, and the plurality of first connecting ribs 301 arranged radially along the air guide shroud 300.

[0054] When the fan is working, the air will naturally form a rotating, vortex-like flow field at the air inlet of the volute. The first connecting rib 301 can guide and sort this rotating airflow, so that it can enter the air inlet of the volute more smoothly, thereby reducing the vortex and energy loss caused by sudden changes in airflow direction.

[0055] In some embodiments, as shown in the appendix Figure 8 and attached Figure 9 As shown, the air guide shroud 300 may include a plurality of second connecting ribs 302. The second connecting ribs 302 extend radially along the air guide shroud 300, and the plurality of second connecting ribs 302 are arranged circumferentially along the air guide shroud 300. One end of the plurality of second connecting ribs 302 extends and intersects the axis.

[0056] The second connecting rib 302, radiating from the axis of the air guide shroud 300 to the edge, plays a major supporting role in the overall structural rigidity of the air guide shroud 300, preventing it from deforming or collapsing under airflow suction. The second connecting rib 302 and the first connecting rib 301 intersect to form a mesh structure, disrupting the vortex formation space, thereby reducing the possibility of generating large vortices and thus reducing vortex noise.

[0057] For ease of description, see attached. Figure 8 and attached Figure 9As shown, the end of the first connecting rib 301 away from the volute 200 is defined as the first end, and the end of the first connecting rib 301 close to the volute 200 is defined as the second end. The first connecting rib 301 is inclined from the first end to the second end in the direction close to the axis of the air guide shroud 300. The side of the first connecting rib 301 away from the axis forms a first included angle γ with the plane perpendicular to the axis direction, where γ > 0° and γ ≤ 90°.

[0058] When γ ≤ 0°, if γ = 0°, then the side of the second connecting rib 302 near the volute inlet is parallel to the horizontal plane. In this case, the second connecting rib 302 cannot provide any guidance for the airflow. When the airflow passes through, a boundary layer separation zone easily forms above the rib surface. This causes the airflow to be obstructed by the boundary layer when entering the volute inlet, thus reducing the effective air intake area and decreasing the fresh air intake volume. The side of the first connecting rib 301 near the axis of the air guide shroud 300 is defined as the first annular surface 303. If γ < 0°, the first annular surface 303 is concave towards the axis. When the airflow enters this area, under the guidance of the second connecting rib 302, the airflow will form a strong vortex, thus interfering with the main airflow entering the volute inlet, further reducing the fresh air intake volume and increasing noise.

[0059] When γ > 90°, the first annular surface 303 is recessed towards the axis of the volute air inlet. Under the combined action of multiple second connecting ribs 302, the mesh structure of the air guide shroud 300 presents as a concave cavity facing the axis. When the airflow enters the volute air inlet through the air guide shroud 300, the airflow forms a large-scale, high-energy vortex in the concave cavity under the guidance of the second connecting ribs 302, thereby blocking the flow channel, increasing airflow resistance, reducing the fresh air intake volume, and generating greater noise.

[0060] When 0°<γ≤90°, the first annular surface 303 protrudes away from the axis, so that when the airflow hits the side of the first annular surface 303 near the axis, the airflow can enter the volute air inlet more smoothly under the guidance of the first annular surface 303, thereby optimizing the wind field, reducing the number and size of generated air, and thus increasing the air intake of the volute and reducing the noise generated by the collision of vortices with the surrounding environment.

[0061] In some embodiments, as shown in the appendix Figure 8 and attached Figure 9As shown, a plane perpendicular to the axis of the air guide shroud 300 is defined as the first plane, which coincides with the plane on the side of the air guide shroud 300 closest to the volute 200. The distance between the end of the air guide shroud 300 away from the first plane and the first plane gradually decreases from the central axis outwards. By further defining the overall shape of the air guide shroud 300, it forms a curved surface that is high in the center and low around the edges, i.e., the air guide shroud 300 is arched. This effectively disperses and transmits the negative air pressure acting on its surface evenly to the surrounding fixed boundaries, improving the structural stability of the air guide shroud 300. At the same time, the protruding structure of the air guide shroud 300 compared to the first plane compresses the vortex formation space, thereby disrupting the original vortex formation space at the air inlet of the volute. This causes the originally larger vortices to be compressed into smaller vortices, and the smaller vortices can attenuate more quickly, thus achieving the effect of reducing vortex noise.

[0062] In some embodiments, as shown in the appendix Figure 7 and attached Figure 10 As shown, the air guide shroud 300 may include a first shroud portion 305, which protrudes along its axis toward the side away from the volute 200. The first shroud portion 305 is located near the indoor air inlet 103. During the process of exhausting indoor air to the outside, after the indoor air enters the casing 100 through the indoor air inlet 104, the indoor air directly enters the volute air inlet through the first shroud portion 305. That is, the first shroud portion 305 is located on the windward side where indoor air enters. By setting the first shroud portion 305, the vortex formation space is compressed. Under the guidance of the first shroud portion 305, the airflow can enter the volute air inlet more smoothly, thereby increasing the fresh air intake volume.

[0063] In some embodiments, the air guide shroud 300 may include a second shroud portion 306, which is connected to the first shroud portion 305 on the side near the volute air inlet axis. The axial direction of the volute air inlet is defined as the height direction of the air guide shroud 300. At the same distance from the central axis, the height of the second shroud portion 306 is lower than the height of the first shroud portion 305, and the second shroud portion 306 is closer to the filter 500 relative to the first shroud portion 305.

[0064] During the process of outdoor air entering the room, outdoor air enters the casing 100 through the first air inlet 101, enters the volute 200 through the fresh air inlet 105, and then sequentially passes through the air exchange 109, filter 500, and second cover 306 to enter the volute air inlet. Finally, it enters the room through the volute air outlet 107 and the second air inlet 102. The second cover 306 is located on the windward side of the incoming outdoor air. The outdoor air is first filtered by the filter 500. Since the filter 500 increases the airflow resistance, the second cover 306 reduces the resistance encountered by the airflow as it enters the volute air inlet, ensuring that most of the airflow can be efficiently drawn in. Simultaneously, the airflow follows the second cover 306 into the volute air inlet, reducing the possibility of airflow vortex formation and lowering turbulence noise caused by changes in airflow velocity.

[0065] In the above technical solution, by setting the first cover part 305 and the second cover part 306, the vortex formation space is compressed and the vortex formation conditions are destroyed, thereby reducing the number and size of vortices generated and reducing noise; at the same time, under the synergistic effect of the first cover part 305 and the second cover part 306, the airflow at each point in the circumferential direction of the volute air inlet can spiral into the volute 200 along the overall shape of the air guide cover 300, thereby increasing the fresh air intake volume and reducing aerodynamic noise.

[0066] In some embodiments, as shown in the appendix Figure 10 and attached Figure 11 As shown, the first cover portion 305 may include a plurality of first ribs 307. The first ribs 307 extend in an arc shape along the circumference of the first cover portion 305, and the plurality of first ribs 307 are arranged radially along the first cover portion 305. The first ribs 307 are distributed in a ring to guide the rotating airflow so that it can smoothly enter the air inlet of the volute.

[0067] In some embodiments, the first cover portion 305 may include a plurality of second ribs 308 extending radially and arranged circumferentially along the first cover portion 305. The ends of the plurality of second ribs away from the volute 200 intersect at the axis of the air guide shroud 300. The first ribs 307 and the second ribs 308 are cross-connected to disrupt the vortex formation environment, thereby reducing the possibility of generating large vortices and thus reducing vortex noise.

[0068] In some embodiments, the second cover portion 306 may include a plurality of third ribs 309, which extend circumferentially in an arc shape along the second cover portion 306 and are arranged radially along the second cover portion 306. This annular arrangement can effectively adapt to and guide the airflow entering the volute inlet, forming a more orderly rotating flow field. This reduces impact loss and vortex generation at the airflow inlet, ultimately increasing the fresh air intake volume and reducing the operating noise of the centrifugal fan.

[0069] In some embodiments, the second cover portion 306 may include a plurality of fourth ribs 310 extending radially and arranged circumferentially along the second cover portion 306. The ends of the plurality of second ribs away from the volute 200 intersect at the axis of the air guide shroud 300. The third rib 309 and the fourth rib 310 are cross-connected to disrupt the vortex generation environment, increase the fresh air intake, and reduce noise.

[0070] In some embodiments, as shown in the appendix Figure 10 and attached Figure 11 As shown, both the first rib 307 and the third rib 309 are inclined towards the axis of the air guide shroud 300 from the end away from the volute 200 to the end near the volute 200. The arc surface of the first rib 307 away from the axis of the air guide shroud 300 forms a second included angle α with the plane perpendicular to the axis direction, where α > 0° and α ≤ 90°. The arc surface of the third rib 309 away from the axis of the air guide shroud 300 forms a third included angle β with the plane perpendicular to the axis direction, where β > 0° and β ≤ 90°.

[0071] When the second included angle α and the third included angle β are within this range, the second arc surface can guide the incoming airflow, causing it to turn smoothly and merge into the interior of the volute 200 from the volute air inlet, reducing the possibility of the airflow generating vortices at the volute air inlet, thereby increasing the fresh air volume and reducing the noise generated by the centrifugal fan during operation.

[0072] In some embodiments, the sizes of the second included angle α and the third included angle β are different to adapt to different models. For example, the second included angle α is 30° and the third included angle β is 45°. By limiting the angles of the second included angle α and the third included angle β, the first rib 307 and the third rib 309 can guide the airflow in accordance with the wind field environment to increase the fresh air intake.

[0073] In other embodiments, as shown in the appendix Figure 10 and attached Figure 11 As shown, a plane perpendicular to the axis of the air guide shroud 300 is defined as the first plane. The first plane coincides with the plane of the end of the air guide shroud 300 near the volute 200, and the second shroud portion 306 is located on the first plane. At this time, the third rib 309 extends vertically and connects with the first shroud portion 305 to form a connecting surface 311. That is, the connecting surface 311 is perpendicular to the second shroud portion 306.

[0074] In some embodiments, in order to increase the structural strength of the air guide shroud 300, a reinforcing rib 312 is connected to the side of the second shroud portion 306 near the first shroud portion 305. The reinforcing rib 312 is located inside the connecting surface 311, and the third ribs 309 are all connected and fixed to the reinforcing rib 312.

[0075] In the above technical solution, the first cover portion 305 constructs a good airflow channel for the airflow flowing in from the indoor air inlet 104; the horizontal arrangement of the second cover portion 306 ensures that the outdoor air entering from the first air outlet 101 experiences extremely low resistance, maximizing the passage efficiency of the airflow from the second cover portion 306 into the volute air inlet. The arrangement of the first cover portion 305 compresses the vortex formation space, thereby disrupting the conditions for vortex generation, and thus achieving the effects of increasing airflow and reducing noise.

[0076] In some embodiments, as shown in the appendix Figure 12 and attached Figure 13 As shown, let h be the distance between the end of the air guide shroud 300 furthest from the first plane and the first plane, where h > 0 mm and h ≤ 40 mm. When h ≤ 0 mm, the air guide shroud 300 is recessed into the volute 200, forming a bowl-shaped structure, which increases the space for vortex formation, thus facilitating vortex generation but hindering the increase of airflow and noise reduction. When h > 40 mm, increasing the distance of the air guide shroud 300 relative to the first plane has no significant effect on increasing the fresh air intake or reducing noise, leading to increased production costs.

[0077] When 0mm < h ≤ 40mm, the height of the air guide shroud 300 can be changed according to the height of the volute 200, the height of the housing 100, and the height of the filter 500. Within this range, the air guide shroud 300 can significantly improve the air intake of the volute, while destroying the vortex formation space and reducing the size and number of vortices, thereby achieving the effect of reducing noise.

[0078] For example, in this embodiment of the application, an insulation board is provided on the inner wall of the housing 100 near the centrifugal fan. The thickness of the insulation board is A, the height of the volute 200 is B, the height of the housing 100 is H, the height of the air guide shroud 300 is h, the height of the filter screen 500 is D, the distance between the filter screen 500 and the inner wall of the housing 100 along the axial direction at the fan axis is E, the distance between the end of the air guide shroud 300 away from the first plane and the filter screen 500 is the safety height, which is C, the angle between the plane where the filter screen 500 is located and the inner wall of the housing 100 is Q, and the distance between the end of the filter screen 500 near the housing 100 and the fan axis is L.

[0079] Where H = A + B + D, D = h + C + E, it can be seen from the above calculation formulas that the height of the casing 100, the height of the volute 200, and the thickness of the insulation board determine the height of the filter 500 and the height of the air guide 300. Through mathematical calculation, it can be seen that the angle between the plane where the filter 500 is located and the inner wall of the casing 100 is calculated as: tg(Q) = E / L, then E = tg(Q) * L. From the above calculation formula, it can be derived that the calculation formula for the height H of the casing 100 is: H = A + B + h + C + tg(Q) * L. Then, through formula transformation, the calculation formula for the height h of the air guide 300 is: h = H - A - B - C - tg(Q) * L. Based on the experimentally tested safe height C and insulation board thickness A, C≥5mm, A≥15mm, H=193.8mm, A=16.5mm, B=110.4mm, C=5mm, tg(Q)=tg(18°)=0.325, L=76mm. Substituting these values ​​into the formula for calculating the height of the air guide hood 300, we get: h=193.8-16.5-110.4-5-0.325*76=37.2mm. That is, the height h of the air guide hood 300 is 37.2mm, which is within the specified range for the height h of the air guide hood 300.

[0080] In some embodiments, as shown in the appendix Figure 2 and attached Figure 14 As shown, the edge of the air guide shroud 300 near the volute 200 extends radially away from the axis on the first plane to form a mounting plate 400, which is detachably connected to the volute 200. By making the mounting plate 400 detachably connected to the outer wall of the volute 200, the air guide shroud 300 can be easily replaced by personnel, thereby improving the maintenance efficiency of the air guide shroud 300.

[0081] In some embodiments, as shown in the appendix Figure 15 As shown, the air guide shroud 300 may include reinforcing ribs 304, which extend along the diameter of the air guide shroud 300. Multiple reinforcing ribs 304 are spaced apart along the circumference of the air guide shroud 300. The reinforcing ribs 304 are cross-connected with multiple rows of first connecting ribs 301 away from the axis, thereby enhancing the structural strength of the connection between the air guide shroud 300 and the mounting plate 400.

[0082] In some embodiments, as shown in the appendix Figure 2 and attached Figure 14 As shown, a limiting part is provided on the side wall of the volute 200 near the air guide shroud 300. The limiting part is used to restrict the movement of the mounting plate 400 on the outer wall of the volute 200.

[0083] In some embodiments, a connector 401 is provided between the mounting plate 400 and the volute 200, the connector 401 being used to fix the connection between the mounting plate 400 and the outer wall of the volute 200. During assembly, a limiting part is provided to achieve quick positioning of the mounting plate 400 on the outer wall of the volute 200, and the operator then uses the connector 401 to fix the mounting plate 400 on the outer wall of the volute 200.

[0084] In some embodiments, the connector 401 includes screws, and the outer walls of the mounting plate 400 and the volute 200 are respectively provided with screw holes. The screws pass through the screw holes and are simultaneously inserted into the outer walls of the mounting plate 400 and the volute 200 to fix the mounting plate 400 and the volute 200 to the outer walls. During installation, after the operator quickly determines the position of the mounting plate 400 on the outer wall of the volute 200 using the limiting part, the mounting plate 400 and the outer wall of the volute 200 are connected by screws on the side of the mounting plate 400 near the first limiting rib 402 opposite to the air inlet of the volute, thereby fixing the mounting plate 400 to the volute 200.

[0085] In some embodiments, the limiting portion may include a first limiting rib 402, which is located on the outer wall of the volute 200. During assembly, the adjacent sides of the mounting plate 400 abut against the outer wall of the volute 200 and the side wall of the first limiting rib 402, respectively. At this time, the axis of the air guide shroud 300 is on the same straight line as the axis of the air inlet of the volute, that is, the air guide shroud 300 is located directly above the air inlet of the volute.

[0086] In some embodiments, the limiting portion may include a second limiting rib 402, the length direction of the second limiting rib 404 being perpendicular to the length direction of the first limiting rib 402; when the connecting member 401 fixes the position of the mounting plate 400, the two perpendicular side walls of the mounting plate 400 abut against the first limiting rib 402 and the second limiting rib 404 respectively. During assembly, the operator moves the mounting plate 400 on the outer wall of the volute 200, so that the side walls of the mounting plate 400 abut against the first limiting rib 402 and the second limiting rib 404 respectively, thereby limiting the position of the mounting plate 400 on the two-dimensional plane, further improving the assembly efficiency of the mounting plate 400 and the volute 200.

[0087] In some embodiments, a limiting buckle 403 is provided on the first limiting rib 402 or the second limiting rib 404, and the limiting buckle 403 is disposed opposite to the connector 401 on both sides of the air inlet of the volute. During assembly, the operator moves the mounting plate 400 to abut against the side wall of the first limiting rib 402. At this time, the side of the limiting buckle 403 near the volute 200 is located on the side of the mounting plate 400 away from the outer wall of the volute 200. That is, at this time, the mounting plate 400 is located between the limiting buckle 403 and the outer wall of the volute 200, thereby fixing the position of the mounting plate 400 in the direction perpendicular to the outer wall of the volute 200. In other words, the position of the mounting plate 400 in three-dimensional space is fixed during assembly.

[0088] In some embodiments, as shown in the appendix Figure 2 and attached Figure 14 As shown, the description takes the limiting buckle 403 set on the first limiting rib 402 as an example. Multiple limiting buckles 403 are set along the length direction of the first limiting rib 402. In this embodiment, two are used as an example. The two limiting buckles 403 are located near the two ends of the first limiting rib 402, thereby increasing the fixing effect on the position of the mounting plate 400.

[0089] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A ducted air conditioner, characterized in that, It includes: A housing, the housing comprising a first side plate, a second side plate, and a bottom plate arranged adjacent to each other; The housing also includes: The first air vent is located on the first side panel; The second air vent is located on the second side panel; An indoor air inlet is located on the base plate; The fresh air module includes: A filter screen, which is disposed inside the housing, is used to filter outdoor air; A centrifugal fan is installed inside the casing. When the ducted air conditioner is in fresh air mode, the centrifugal fan draws outdoor air into the casing from the first air inlet and into the room from the second air inlet. When the ducted air conditioner is in exhaust mode, the centrifugal fan draws indoor air into the casing from the indoor air inlet and exhausts it to the outside from the first air inlet. The centrifugal fan includes: The volute is provided with a volute air inlet; The fan is housed within the volute. An air guide shroud is provided at the air inlet of the volute, and the center of the air guide shroud protrudes away from the volute along its axis.

2. The duct air conditioner according to claim 1, characterized in that, The air guide cover includes: A first cover portion, the first cover portion protruding along its axis toward the side away from the volute; The second cover portion is connected to the first cover portion on the side near the air inlet axis of the volute. The axial direction of the volute air inlet is defined as the height direction of the air guide shroud. At the same distance from the axis, the height of the second shroud is lower than the height of the first shroud, and the first shroud is closer to the indoor air inlet than the second shroud.

3. The duct air conditioner according to claim 2, characterized in that, The filter screen is disposed on the side of the volute near the air guide shroud, and the second shroud portion is closer to the filter screen relative to the first shroud portion.

4. The duct air conditioner according to claim 2, characterized in that, The height of the air guide shroud gradually decreases from the central axis to the surrounding area.

5. The duct air conditioner according to claim 1, characterized in that, Let the height of the air guide shroud be h, where h > 0 mm and h ≤ 40 mm.

6. The duct air conditioner according to claim 1, characterized in that, The fresh air module includes a mounting plate formed along the outer periphery of the air guide shroud and detachably connected to the volute.

7. The duct air conditioner according to claim 6, characterized in that, The volute is provided with a limiting part, which is used to restrict the movement of the mounting plate on the outer wall of the volute near the air guide shroud. A connector, which passes through the mounting plate and the side wall of the volute, is used to fix the mounting plate and the volute to restrict the movement of the mounting plate in a plane perpendicular to the fan axis.

8. The duct air conditioner according to claim 7, characterized in that, The limiting part includes: First limiting reinforcement; The second limiting rib has a length direction perpendicular to the length direction of the first limiting rib. The first limiting rib and the second limiting rib abut against the two side walls of the mounting plate that are perpendicular to each other, thereby restricting the movement of the mounting plate in two mutually perpendicular directions.

9. The duct air conditioner according to claim 8, characterized in that, The first or second limiting rib is provided with a limiting buckle. The limiting buckle is disposed opposite to the connecting member on both sides of the air inlet of the volute. The limiting buckle is used to restrict the movement of the mounting plate on a plane perpendicular to the fan axis.

10. The duct air conditioner according to claim 4, characterized in that, The air guide cover includes: Multiple first connecting ribs extend in a ring along the circumference of the air guide shroud and are arranged radially along the air guide shroud; Multiple second connecting ribs extend radially and are arranged circumferentially along the air guide shroud. Multiple first connecting ribs and multiple second connecting ribs intersect and connect to form a mesh structure; the sides of the first connecting ribs away from the axis... The end of the first connecting rib away from the volute is defined as the first end, and the end of the first connecting rib close to the volute is defined as the second end. The first connecting rib is inclined from the first end to the second end in a direction close to the axis of the air guide shroud. A first included angle γ is formed between the side of the first connecting rib away from the axis and the plane perpendicular to the axis direction, where γ > 0° and γ ≤ 90°.

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