Fan and air duct type air conditioner

Abstract

The utility model discloses a fan and an air duct type air conditioner. The fan comprises a volute. The volute comprises a volute body and a movable inner shell. The volute body is provided with a side air outlet located in the side face and a lower air outlet located in the bottom face. The movable inner shell is arranged on the inner side of the volute body and provided with a ventilation opening. The movable inner shell is rotatably arranged around the axis of the fan relative to the volute body so that the fan can be switched between the side air outlet state and the lower air outlet state. In the side air outlet state, the ventilation opening communicates with the side air outlet to form a side air outlet channel used for supplying cold air. In the lower air outlet state, the ventilation opening communicates with the lower air outlet to form a lower air outlet channel used for supplying hot air. On the plane perpendicular to the axis of the draught fan, the projection of the side air outlet channel forms a side air outlet volute molded line. And the projection of the lower air outlet duct forms a lower air outlet volute molded line. The shape of the side air outlet volute molded line is different from that of the lower air outlet volute molded line. According to the utility model, the working noise of the fan is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, and in particular to a fan and duct air conditioner. Background Technology

[0002] Currently, ducted air conditioners suffer from slow heating and poor heating comfort. Users often try to mitigate these issues by using deflectors or adjusting the angle of the air vents, but this increases energy consumption. A better solution is to use a variable-direction fan, but variable-direction fans generate more aerodynamic noise.

[0003] It should be noted that the description in this background section only provides background information related to this utility model and does not necessarily constitute prior art. Utility Model Content

[0004] This invention provides a fan and a duct-type air conditioner to reduce aerodynamic noise.

[0005] The first aspect of this utility model provides a fan, including a volute, the volute comprising:

[0006] The volute body has a side air outlet on the side and a bottom air outlet on the bottom surface; and

[0007] The movable inner shell is located inside the volute body and has a vent. The movable inner shell is rotatably arranged relative to the volute body around the axis of the fan so that the fan can switch between a side air outlet state and a bottom air outlet state. In the side air outlet state, the vent is connected to the side air outlet to form a side air outlet duct for delivering cold air; in the bottom air outlet state, the vent is connected to the bottom air outlet to form a bottom air outlet duct for delivering hot air.

[0008] In this case, on a plane perpendicular to the axis of the fan, the projection of the side outlet duct forms the side outlet volute profile, and the projection of the bottom outlet duct forms the bottom outlet volute profile. The side outlet volute profile and the bottom outlet volute profile have different shapes.

[0009] In some embodiments, the air outlet direction of the side outlet duct is inclined upward relative to the horizontal line.

[0010] In some embodiments, the side-discharge volute profile includes a first side-discharge profile and a second side-discharge profile respectively disposed opposite to each other on both sides of the side-discharge duct. The first side-discharge profile includes a first side-discharge straight segment located at one end of the side-discharge outlet, and the second side-discharge profile includes a second side-discharge straight segment located at one end of the side-discharge outlet. The first side-discharge straight segment is inclined upward relative to the horizontal line; and / or, the second side-discharge straight segment is inclined upward relative to the horizontal line.

[0011] In some embodiments, the angle between the straight segment of the first air outlet and the horizontal line is [5°, 30°]; and / or, the angle between the straight segment of the second air outlet and the horizontal line is [20°, 55°].

[0012] In some embodiments, the first side air outlet profile further includes a first side air outlet curved segment connected to the first side air outlet straight segment, the first side air outlet curved segment protruding outward.

[0013] In some embodiments, the projection of the fan's axis onto the vertical plane forms a center point, and in the circumferential direction centered on the center point, the area covered by the first side air outlet curve segment is greater than the area covered by the first side air outlet straight segment.

[0014] In some embodiments, the angle between the first end of the first side air outlet straight segment and the center point of the first line and the second end of the first side air outlet straight segment and the center point of the second line is the first included angle, and the angle between the first end of the first side air outlet profile and the center point of the third line and the second end of the first side air outlet profile and the center point of the fourth line is the second included angle, and the fourth line coincides with the second line. The first ratio between the first included angle and the second included angle is in the range of [0.3, 0.7].

[0015] In some embodiments, the angle between the third line connecting the first end of the first side air outlet profile to the center point and the fourth line connecting the second end of the first side air outlet profile to the center point is the second angle, which is in the range of [75°, 100°].

[0016] In some embodiments, the second side air outlet profile further includes a second side air outlet curved section disposed on the side away from the side air outlet of the second side air outlet straight section, wherein the angle between the tangent of the second side air outlet curved section intersecting the axis and the horizontal line is [-15°, 15°].

[0017] In some embodiments, the lower air outlet volute profile is flared at one end of the lower air outlet.

[0018] In some embodiments, the lower air outlet volute profile includes a first lower air outlet profile and a second lower air outlet profile respectively disposed on both sides of the lower air outlet duct, wherein the first lower air outlet profile includes a first lower air outlet straight line segment located at one end of the lower air outlet, and the angle between the first lower air outlet straight line segment and the vertical line is in the range of [0°, 15°]; and / or, the second lower air outlet profile includes a second lower air outlet straight line segment located at one end of the lower air outlet, and the angle between the second lower air outlet straight line segment and the vertical line is in the range of [2°, 25°].

[0019] In some embodiments, the lower air outlet volute profile includes a first lower air outlet profile and a second lower air outlet profile respectively disposed on both sides of the lower air outlet duct. The first lower air outlet profile includes a first lower air outlet straight section located at one end of the lower air outlet and a first lower air outlet curved section disposed on the side of the first lower air outlet straight section away from the lower air outlet. The first lower air outlet curved section protrudes outward.

[0020] In some embodiments, the projection of the fan's axis onto the vertical plane forms a center point, and in the circumferential direction centered on the center point, the area covered by the first lower air outlet curved segment is greater than the area covered by the first lower air outlet straight segment.

[0021] In some embodiments, the angle between the fifth line connecting the first end of the first downward air outlet straight segment to the center point and the sixth line connecting the second end of the first downward air outlet straight segment to the center point is the third angle, the angle between the seventh line connecting the first end of the first downward air outlet profile to the center point and the eighth line connecting the second end of the first downward air outlet profile to the center point is the fourth angle, the eighth line coincides with the sixth line, and the range of the second ratio between the third angle and the fourth angle is [0.35, 0.65].

[0022] In some embodiments, the fourth included angle ranges from [70°, 105°].

[0023] In some embodiments, the lower air outlet volute profile includes a first lower air outlet profile and a second lower air outlet profile respectively disposed on both sides of the lower air outlet duct. The second lower air outlet profile includes a second lower air outlet straight section located at one end of the lower air outlet and a second lower air outlet curved section disposed on the side of the second lower air outlet straight section away from the lower air outlet. The angle between the tangent line of the second lower air outlet curved section intersecting the axis and the vertical line is [12°, 40°].

[0024] In some embodiments, the fan further includes a wind turbine, which is disposed within a movable inner shell, and the axial length of the wind turbine is greater than its diameter.

[0025] In some embodiments, the ratio between the axial length of the wind turbine and the diameter of the wind turbine ranges from [1.02, 1.42].

[0026] In some embodiments, the ratio between the diameter of the impeller and the height of the volute body ranges from [0.63, 0.76].

[0027] In some embodiments, the ratio between the dimension of the side outlet in the axial direction of the fan and the axial length of the impeller is in the range of [1.15, 1.3]; and / or, the ratio between the dimension of the bottom outlet in the axial direction of the fan and the axial length of the impeller is in the range of [1.15, 1.3].

[0028] In some embodiments, the wind turbine also includes a wind turbine blades configured to resemble the shape of a long-eared owl.

[0029] In some embodiments, during the switching between side-outlet and bottom-outlet states, the rotation angle of the movable inner shell ranges from [90° to 140°].

[0030] The second aspect of this utility model provides a ducted air conditioner, including a casing, a heat exchanger and the aforementioned fan, with the fan disposed inside the casing.

[0031] In some embodiments, the air conditioner includes at least two fans arranged in parallel.

[0032] Based on the technical solution provided by this utility model, the fan includes a volute. The volute includes a volute body and a movable inner shell. The volute body has a side outlet on its side and a bottom outlet on its bottom. The movable inner shell is disposed inside the volute body and has a vent. The movable inner shell is rotatably arranged relative to the volute body around the fan's axis to allow the fan to switch between a side outlet state and a bottom outlet state. In the side outlet state, the vent communicates with the side outlet to form a side outlet duct for supplying cold air. In the bottom outlet state, the vent communicates with the bottom outlet to form a bottom outlet duct for supplying hot air. The projection of the side outlet duct onto a plane perpendicular to the fan's axis forms a side outlet volute profile. The projection of the bottom outlet duct forms a bottom outlet volute profile. The side outlet volute profile and the bottom outlet volute profile have different shapes. The fan of this utility model has different shapes for the side outlet volute profile of the side outlet duct and the bottom outlet volute profile of the bottom outlet duct. This makes the shape of the side outlet duct match the downstream cooling duct and the bottom outlet duct match the upstream heating duct. This allows the fan to operate in the optimal working range under each matched duct, thereby improving the aerodynamic performance of the fan and reducing operating noise.

[0033] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0034] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0035] Figure 1 This is an exploded structural diagram of the fan according to an embodiment of the present utility model.

[0036] Figure 2 This is a schematic diagram of the fan in the side-discharge state according to an embodiment of the present invention.

[0037] Figure 3 This is a schematic diagram of the fan in the downward air outlet state according to an embodiment of the present invention.

[0038] Figure 4 This is a schematic diagram showing the rotation angle of the movable inner shell of the fan when switching from the side air outlet state to the bottom air outlet state according to an embodiment of the present invention.

[0039] Figures 5 to 7 This is a schematic diagram of the side outlet volute profile of the fan according to an embodiment of the present invention.

[0040] Figures 8 to 10 This is a schematic diagram of the lower air outlet volute profile of the fan according to an embodiment of the present invention.

[0041] Figure 11 This is a three-dimensional structural diagram of the volute shell according to an embodiment of the present invention.

[0042] Figure 12 This is a schematic projection of the volute on the vertical plane of an embodiment of the present invention.

[0043] Figure 13 This is a three-dimensional structural diagram of the impeller of the wind turbine according to an embodiment of the present utility model.

[0044] Figure 14 for Figure 13 The diagram shows a partial structural schematic of the wind turbine.

[0045] Figure 15 This is a schematic diagram of the structure of a duct-type air conditioner according to an embodiment of the present invention.

[0046] Figure 16 for Figure 15 The diagram shows the structure of the AA direction when the air is discharged from the side of the duct air conditioner.

[0047] Figure 17 for Figure 15 The diagram shows the structure of the AA direction when the air is discharged from the bottom of the duct air conditioner.

[0048] Figure 18 The noise test results of the duct-type air conditioner according to an embodiment of this utility model are shown. Detailed Implementation

[0049] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0050] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0051] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, and the spatial relative descriptions used herein will be interpreted accordingly.

[0052] refer to Figures 1 to 3 First, the structure and working process of the fan in some embodiments of this utility model will be described.

[0053] like Figure 1 As shown, the fan in some embodiments of this utility model includes a rotor 1 and a volute 2. The volute 2 includes a volute body 21 and a movable inner shell 23 disposed within the volute body 21. For example... Figure 1 As shown, the volute body 21 has a side air outlet 21a on the side and a bottom air outlet 21b on the bottom. Furthermore, the volute body 21 also has a cylindrical cavity. The movable inner shell 23 is a shell extending in the circumferential direction, but it does not cover the entire circumferential direction; that is, it has a notch in the circumferential direction, forming a vent 23a. The movable inner shell 23 is disposed within the cylindrical cavity of the volute body 21 and is rotatable about the axis of the cylindrical cavity. This allows the vent 23a to rotate to a position communicating with the side air outlet 21a to form a side air outlet; or to rotate to a position communicating with the bottom air outlet 21b to form a bottom air outlet.

[0054] A rotating assembly for driving the movable inner shell 23 to rotate can be provided between the movable inner shell 23 and the volute body 21. For example, in some embodiments, the rotating assembly includes an arc-shaped rack disposed on the outer wall of the movable inner shell 23 and a gear disposed on the inner side of the volute body 21, and the rotation of the movable inner shell 23 is achieved through the meshing transmission between the gear and the arc-shaped rack. Of course, in other embodiments, the driving structure can also be disposed at the collector 22. This utility model does not impose any limitations on this.

[0055] In some embodiments, side airflow is used in cooling mode, and bottom airflow is used in heating mode. In cooling mode, side airflow prevents cold air from blowing directly on the body, increasing comfort. In heating mode, bottom airflow allows hot air to quickly reach the lower part of the room, allowing users to feel the warmth quickly and thus improving the problem of slow heating.

[0056] During the research process, the inventors discovered that the variable-direction airflow fan can indeed improve the problems of slow heating and direct cold air blowing. However, when the variable-direction airflow fan switches between side airflow and bottom airflow, the direction of its airflow duct changes, which means that the airflow direction also changes. This results in different noise levels for side and bottom airflow. Moreover, the noise levels for side and bottom airflow are closely dependent on their respective airflow organization. At the same time, the drive components of the movable inner shell 23 require a certain amount of space, which further deteriorates the fan's return air environment. In order to ensure a good connection between the movable inner shell and the side and bottom airflow volute body 21, the design freedom of the volute body 21 along the two end faces along the axis is also severely restricted. In addition, problems such as the inability to completely seal the moving and stationary parts will significantly worsen the fan's operating noise. In response to the problem of excessive noise, the inventors of this utility model discovered through in-depth research that there are significant differences in the airflow organization within the side-discharge air duct and the bottom-discharge air duct. However, in related technologies, the structure of the air outlet duct on the volute body is the same for both side-discharge and bottom-discharge air ducts. This results in a clear mismatch between the airflow organization of the fan and its duct, which in turn causes the problem of excessive fan noise.

[0057] Based on the above findings, this invention adopts a differentiated design for the air outlet ducts of the side-outlet and bottom-outlet types to obtain better aerodynamic performance of the fan, thereby reducing operating noise.

[0058] The following is for reference. Figures 1 to 14 The structure and working process of the fan in some embodiments of this utility model will be described in detail.

[0059] refer to Figures 1 to 3 This utility model provides a fan, including a volute 2. The volute 2 includes a volute body 21 and a movable inner shell 23. The volute body 21 has a side outlet 21a on its side and a bottom outlet 21b on its bottom. The movable inner shell 23 is disposed inside the volute body 21 and has a vent 23a. The movable inner shell 23 is rotatably disposed relative to the volute body 21 about the fan's axis, allowing the fan to switch between a side outlet state and a bottom outlet state. In the side outlet state, the vent 23a communicates with the side outlet 21a to form a side outlet duct O1 for supplying cold air. In the bottom outlet state, the vent 23a communicates with the bottom outlet 21b to form a bottom outlet duct O2 for supplying hot air.

[0060] Specifically, on a plane perpendicular to the fan axis, the projection of the side outlet duct O1 forms the side outlet volute profile. The projection of the bottom outlet duct O2 forms the bottom outlet volute profile. The side outlet volute profile and the bottom outlet volute profile have different shapes.

[0061] The fan in this embodiment of the utility model has different shapes for the side outlet volute profile of the side outlet duct O1 and the bottom outlet volute profile of the bottom outlet duct O2. This makes the shape of the side outlet duct O1 match the downstream cooling duct, and the bottom outlet duct O2 match the upstream heating duct. This allows the fan to operate within its optimal operating range under its respective matched duct, thereby improving the aerodynamic performance of the fan and reducing operating noise.

[0062] The shaft of the fan mentioned above refers to the rotational shaft of the fan rotor 1. For example... Figure 1 As shown, the wind turbine includes a rotor 1. The rotor 1 is a cylindrical structure and rotates around its own axis.

[0063] Figure 2 The diagram shows the projection of the volute 2 of some embodiments of the present invention onto a plane perpendicular to the axis. This includes the side-discharge volute profile of the side-discharge duct O1 and the bottom-discharge volute profile of the bottom-discharge duct O2. In the following description, the "plane perpendicular to the axis" will be simply referred to as the axial plane. This axial plane contains mutually perpendicular horizontal and vertical lines. In the following description, the shape of the volute profile will be specifically described with reference to the horizontal and vertical lines.

[0064] like Figure 4 As shown, in some embodiments, the movable inner shell 23 is rotatably disposed about an axis relative to the volute body 21 so that the fan switches between a side-discharge state and a bottom-discharge state.

[0065] In some embodiments, during the switching between side-discharge and bottom-discharge states, the rotation angle θ of the movable inner shell 23 ranges from [90° to 140°]. Considering the significant differences in airflow organization between the side-discharge and bottom-discharge ducts of the air conditioner, when the rotation angle θ is small, assuming the end of the volute 213 remains fixed, the side-discharge fan's outlet angle is poor, easily causing significant flow loss and severe airflow reduction in the side-discharge duct. Simultaneously, when discharging air downwards, assuming the end of the volute 210 remains fixed, the downward airflow direction is closer to the return air inlet, easily causing short-circuiting of the airflow organization. When the angle θ is large, the poor fan outlet angle also increases the flow loss in the side-discharge duct, while the bottom-discharge airflow tends to blow directly onto the wall, resulting in increased additional flow loss. Therefore, there is an optimal range for the rotation angle θ of the movable inner shell 23 around its axis to achieve the best air delivery form that balances the two airflow organizations, with a preferred range of [90° to 140°].

[0066] refer to Figure 2 In some embodiments, the air outlet direction of the side outlet duct O1 is inclined upwards relative to the horizontal line. The air outlet direction of the side outlet duct O1, as referred to here, means the approximate direction of extension of the centerline of the side outlet duct O1. From Figure 2 As can be seen, in some embodiments, the air outlet direction of the side air outlet duct O1 is set to be inclined upward relative to the horizontal line. This causes the cold air to blow out diagonally upward when it comes out of the side air outlet duct O1, resulting in a longer horizontal air delivery distance and making it easier to achieve a "waterfall-like" cooling effect, thus improving comfort. Moreover, setting the air outlet direction of the side air outlet duct O1 to be inclined upward can better match the layout of the downstream heat exchanger, reduce the air outlet duct resistance, and reduce the attenuation of air volume.

[0067] refer to Figure 16 When the airflow is directed to the side, it enters through the return air inlet at the bottom, is blown out through the side air outlet of the fan 10, and then flows out through the heat exchanger. The heat exchanger is one of the core resistance components along the entire airflow path of the side-discharge airflow. Therefore, the airflow direction of the fan 10 needs to be optimized to reduce the resistance of the airflow as it passes through the heat exchanger, thereby reducing resistance, increasing airflow, and reducing power consumption.

[0068] like Figure 1As shown, the movable inner shell 23 has an arc-shaped main body and a first overlapping end 230 and a second overlapping end 231 respectively disposed at both ends of the arc-shaped main body. The first overlapping end 230 includes a rounded corner portion of a volute tongue connected to the arc-shaped main body and a first overlapping portion overlapping the volute body 21. The rounded corner portion of the volute tongue protrudes towards the interior of the movable inner shell 23. The second overlapping end 231 includes a second overlapping portion connected to the arc-shaped main body.

[0069] like Figure 2 As shown, in the side-ventilation state, the rounded corner of the volute tongue at the first end 230 of the movable inner shell 23 forms part of the side-ventilation duct O1. The other part of the side-ventilation duct O1 is formed by the volute body 21.

[0070] refer to Figure 2 In some embodiments, the side-discharge volute profile includes a first side-discharge profile and a second side-discharge profile respectively disposed opposite to each other on both sides of the side-discharge duct O1. The first side-discharge profile includes a first side-discharge straight section 211 located at one end of the side-discharge outlet 21a. The second side-discharge profile includes a second side-discharge straight section 210 located at one end of the side-discharge outlet 21a. The first side-discharge straight section 211 is inclined upwards relative to the horizontal line. And / or, the second side-discharge straight section 210 is inclined upwards relative to the horizontal line.

[0071] The first side air outlet profile is located below the side air outlet duct O1. The second side air outlet profile is located above the side air outlet duct O1. The first side air outlet profile is formed by the volute body 21. The second side air outlet profile is formed by the volute body 21 and the rounded corner of the volute tongue of the movable inner shell 23. The first side air outlet straight section 211 is set to be inclined upward relative to the horizontal line, so that when cold air is blown out, it can be blown outward along the inner wall of the first side air outlet straight section 211. (Refer to...) Figure 16 At this point, the airflow from the fan matches the layout of the downstream heat exchanger, reducing flow losses in the heat exchanger components and increasing the airflow at the same rotational speed, thereby reducing noise at the same airflow. Simultaneously, it avoids generating secondary noise sources downstream of the fan, preventing increased radiated noise. Similarly, setting the second side outlet straight section 210 to be inclined upwards relative to the horizontal line, together with the first side outlet straight section 211, forms an optimal outlet diffusion channel. This ensures rapid dynamic and static pressure conversion of the high-speed airflow and avoids vortex shedding noise caused by a large diffusion gradient.

[0072] In some embodiments, the angle between the first side outlet straight section 211 and the horizontal line is smaller than the angle between the second side outlet straight section 210 and the horizontal line. That is, the upward inclination of the second side outlet straight section 210 located above the side outlet duct O1 is greater than the upward inclination of the first side outlet straight section 211 located below the side outlet duct O2. The upward inclination of the second side outlet straight section 210 should coincide with the direction of the high-speed airflow blown out by the impeller at the volute tongue, and a certain degree of diffusion is required to reduce the dynamic pressure at the fan outlet and avoid significant flow losses downstream. Therefore, its inclination needs to consider the direction of the high-speed airflow blown out by the impeller, an appropriate diffusion gradient, and the degree of matching with downstream heat exchanger components; while the upward inclination of the first side outlet straight section 211 mainly considers the direction of the high-speed airflow blown out by the impeller and the degree of matching with downstream heat exchanger components. Therefore, the angle between the first side air outlet straight section 211 and the horizontal line is usually smaller than the angle between the second side air outlet straight section 210 and the horizontal line.

[0073] like Figure 5 As shown, in some embodiments, the angle α1 between the first side air outlet straight segment 211 and the horizontal line is [5°, 30°]. And / or, as Figure 6 As shown, the angle Ф1 between the second side air outlet straight section 210 and the horizontal line is [20°, 55°]. Considering that the heat exchanger itself has a certain thickness, and that its upper and lower end faces in contact with the shell need to be sealed, when it is arranged inside the shell, the airflow cannot flow within a certain distance of the upper and lower end faces of the heat exchanger. At the same time, when the air is vented from the side, the airflow blown by the fan should radiate to the entire windward side of the heat exchanger as much as possible. Therefore, there is an angle α1 between the first side air outlet straight section 211 and the horizontal line. Generally, when α1 is located in [5°, 30°], it can effectively reduce the flow loss of the heat exchanger, increase the air volume, and reduce noise. At the volute, the high-speed airflow blown by the fan blades usually blows out at a certain angle with the horizontal line due to the circumferential velocity component of its velocity. Therefore, when the angle Ф1 between the second side air outlet straight section 210 and the horizontal line is small, the high-speed airflow will directly impact the wall of the second side air outlet straight section 210, resulting in a large impact loss and a large amount of radiated noise. When Ф1 is large, the straight section 210 of the second-side outlet will generate a large adverse pressure gradient, leading to flow separation and vortex shedding in its vicinity. This reduces the effective flow area and also generates a significant amount of radiated noise. However, when Ф1 is [20°, 55°], it can simultaneously consider the direction of the high-speed airflow from the impeller, a reasonable diffusion gradient design, and good matching with downstream heat exchanger components. This results in better overall aerodynamic performance and lower fan operating noise.

[0074] like Figure 7As shown, in some embodiments, the first side air outlet profile further includes a first side air outlet curved section 212 connected to the first side air outlet straight section 211, and the first side air outlet curved section 212 protrudes outward. The first side air outlet curved section 212 serves as the starting section of the side air outlet duct O1 and protrudes outward. On the one hand, it can provide a limiting function for the installation of the movable inner shell 23; on the other hand, it can smoothly connect the movable inner shell 23 and the first side air outlet straight section 211 within the confined space, thereby making the flow smooth and the transition smooth, avoiding the generation of eddies and the radiation of noise.

[0075] like Figure 7 As shown, the first side air outlet profile includes a smoothly connected first side air outlet curved segment 212 and a first side air outlet straight segment 211. The first end of the first side air outlet curved segment 212 forms the first end of the first side air outlet profile, and the second end of the first side air outlet curved segment 212 smoothly connects to the first end of the first side air outlet straight segment 211. The second end of the first side air outlet straight segment 211 forms the second end of the first side air outlet profile. The projection of the fan's axis onto the vertical plane forms a center point O. In the circumferential direction centered at this center point O, the area covered by the first side air outlet curved segment 212 is larger than the area covered by the first side air outlet straight segment 211. This arrangement ensures that the first side air outlet straight segment 211 is reasonably and sufficiently inclined upwards, avoiding increased flow loss and reduced airflow. Simultaneously, within the constraints of specific structural dimensions, it maximizes the space utilization of the first side air outlet curved segment 212, which also reduces flow resistance, smooths airflow, and reduces noise.

[0076] The angle between the first end of the first side air outlet straight segment 211 and the first line connecting the center point O, and the second end of the first side air outlet straight segment 211 and the center point O, is the first included angle Ω1. The angle between the third line connecting the first end of the first side air outlet profile and the center point O, and the fourth line connecting the second end of the first side air outlet profile and the center point O, is the second included angle Ω11. The fourth line coincides with the second line. The range of the second included angle Ω11 is [75°, 100°]. The range of the first included angle Ω1 and the second included angle Ω11 is [0.3, 0.7]. Within this range of angles and ratios, the synergistic maximization of structural space utilization, flow resistance reduction, and turbulence noise suppression can be achieved, resulting in a superior aerodynamic noise reduction design.

[0077] like Figure 5As shown, in some embodiments, the second side air outlet profile also includes a second side air outlet curved section disposed on the side of the second side air outlet straight section 210 away from the side air outlet 21a. The angle β1 between the tangent line of the second side air outlet curved section passing through the center point O and the horizontal line is [-15°, 15°]. When the angle β1 is small, the volute tongue is a shallow tongue design, and more of the impeller is exposed, which worsens the aerodynamic performance of the fan and makes it easier to radiate noise. When the angle β1 is large, the volute tongue is a deep tongue design. Although the aerodynamic performance of the fan is optimized and stabilized, the deep tongue design itself will radiate more noise. The angle β1 in this utility model is [-15°, 15°], which well combines the advantages of deep and shallow tongues, achieving a large air volume while having relatively lower noise radiation efficiency, thereby optimizing and improving the overall operating noise of the fan.

[0078] In some embodiments, the second side air outlet curve segment is formed by the rounded corner of the volute tongue of the movable inner shell 23.

[0079] refer to Figure 3 In some embodiments, the lower air outlet volute profile is flared at one end of the lower air outlet 21b. The flared shape refers to the larger cross-sectional area of ​​the air outlet end of the lower air outlet duct O2, forming a trumpet shape. This design fully utilizes the structural space at the lower air outlet, increasing the flow area of ​​the hot air and thus increasing the airflow volume, allowing users to feel the hot air more quickly and further improving the slow heating issue. Furthermore, the larger air outlet end allows for more thorough diffusion of the high-speed airflow, resulting in less dynamic pressure loss and further reducing airflow noise.

[0080] In some embodiments, the profile of the lower air outlet volute includes a first lower air outlet profile and a second lower air outlet profile respectively disposed opposite to each other on both sides of the lower air outlet duct O2. For example, Figure 9 As shown, the first downward air outlet profile includes a first downward air outlet straight segment 214 located at one end of the downward air outlet 21b, and the angle α2 between the first downward air outlet straight segment 214 and the vertical line ranges from [0°, 15°]. And / or, as... Figure 8 As shown, the second lower air outlet profile includes a second lower air outlet straight section 213 located at one end of the lower air outlet 21b, and the angle Ф2 between the second lower air outlet straight section 213 and the vertical line is in the range of [2°, 25°].

[0081] To elaborate further, refer to Figure 17The angle Ф2 between the second lower air outlet straight section 213 and the vertical line is relatively small, mainly to avoid the air outlet tilting towards the return air side, which could lead to a short circuit between the air supply and return airflow of the air conditioning unit. Meanwhile, the angle α2 between the first lower air outlet straight section 214 and the vertical line is set to [0°, 15°]. This ensures that the high-speed airflow achieves more sufficient diffusion without impacting the downstream wall, thereby reducing dynamic pressure, flow loss, increasing air volume, and reducing noise. It also helps to ensure concentrated delivery of hot air, improving the problem of poor heating performance.

[0082] like Figure 10 As shown, in some embodiments, the first lower air outlet profile further includes a first lower air outlet curved section 215 disposed on the side of the first lower air outlet straight section 214 away from the lower air outlet 21b. The first lower air outlet curved section 215 protrudes outward. The first lower air outlet curved section 215 serves as the starting section of the lower air outlet duct O2 and protrudes outward, thus providing a larger space for airflow when it flows into the lower air outlet duct O2, avoiding the generation of eddies, and thereby reducing noise.

[0083] like Figure 10 As shown, the first downward air outlet profile includes a smoothly connected first downward air outlet curved segment 215 and a first downward air outlet straight segment 214. The first end of the first downward air outlet curved segment 215 forms the first end of the first downward air outlet profile, and the second end of the first downward air outlet curved segment 215 smoothly connects to the first end of the first downward air outlet straight segment 214. The second end of the first downward air outlet straight segment 214 forms the second end of the first downward air outlet profile. The projection of the fan's axis onto the vertical plane forms a center point O. In the circumferential direction centered at this center point O, the area covered by the first downward air outlet curved segment 215 is larger than the area covered by the first downward air outlet straight segment 214. This arrangement allows the airflow to flow smoothly out over a larger area after entering the downward air outlet duct O2, resulting in less resistance and effectively reducing noise.

[0084] The angle between the fifth line connecting the first end of the first downward air outlet straight segment 214 to the center point O and the sixth line connecting the second end of the first downward air outlet straight segment 214 to the center point O is the third included angle Ω2. The angle between the seventh line connecting the first end of the first downward air outlet profile to the center point O and the eighth line connecting the second end of the first downward air outlet profile to the center point O is the fourth included angle Ω22. The eighth line coincides with the sixth line. The range of the fourth included angle Ω22 is [70°, 105°]. The range of the second ratio between the third included angle Ω2 and the fourth included angle Ω22 is [0.35, 0.65]. Within this ratio range, the noise reduction effect is better.

[0085] In some embodiments, the second included angle Ω11 ≤ the fourth included angle Ω22. The first ratio ≤ the second ratio.

[0086] like Figure 9 As shown, in some embodiments, the second lower air outlet profile further includes a second lower air outlet curved segment disposed on the side of the second lower air outlet straight segment 213 away from the lower air outlet 21b. The angle β2 between the tangent line of the second lower air outlet curved segment passing through the center point and the vertical line is [12°, 40°]. Relative to side air outlets, refer to... Figure 17 In cases where the overall airflow organization is poor and the duct resistance is greater, the fan noise is more affected by the duct resistance than by the degree of impeller exposure. Therefore, the volute structure should tend to have a deeper tongue design to fully enhance the fan's work capacity. However, the increased noise caused by the deeper tongue design should also be considered. The included angle β2 range in this invention effectively balances the above requirements, ensuring a sufficiently large air pressure supply while avoiding the increased noise and capacity reduction caused by an excessively deep tongue design. At the same time, it also further distances the air outlet from the return air outlet, preventing short-circuiting of the airflow organization.

[0087] In some embodiments, the second lower air outlet curve segment is formed by the rounded corner of the volute tongue of the movable inner shell 23.

[0088] like Figure 2 As shown, the volute body 21 of this embodiment of the present invention also includes a support portion 216. The two ends of the support portion 216 are respectively connected to a first lower air outlet curved section 215 and a second side air outlet straight section 210.

[0089] refer to Figure 1 and Figure 13 In some embodiments, the fan further includes a fan wheel 1. The fan wheel 1 is disposed within a movable inner housing 23. The axial length B of the fan wheel 1 is greater than the diameter D2 of the fan wheel 1. Setting the axial length B of the fan wheel 1 to be greater than the diameter D2 of the fan wheel 1 reduces the flow rate distributed per unit axial length of the fan wheel, thereby reducing the wind speed and noise.

[0090] In some embodiments, the ratio between the axial length B of the wind turbine 1 and the diameter D2 of the wind turbine 1 ranges from [1.02, 1.42]. When the ratio is within this range, it can reduce wind speed and thus noise, while also avoiding the negative effect of excessive wind turbine length causing the blades at the tip of the turbine blades to perform ineffective work and radiate more noise. Overall, lower noise is achieved within the above ratio range.

[0091] In some embodiments, the ratio between the diameter D2 of the impeller 1 and the height H of the volute body 21 ranges from [0.63, 0.76]. In most air conditioning units, the fan size is under strong constraints, meaning that the relationship between the impeller diameter and the volute profile cannot meet the theoretical design requirements. An impeller diameter that is too small or too large will cause a rapid deterioration in fan performance and noise levels. Therefore, setting the ratio of the fan diameter to the height H of the volute body 21 to [0.66, 0.72] achieves an optimal design that balances fan performance and noise levels.

[0092] In some embodiments, the ratio between the axial dimension L of the side outlet 21a and the axial length B of the impeller 1 ranges from [1.15, 1.3]. This allows for smaller vortex losses at the impeller blade tip while ensuring a relatively reasonable fan outlet area, further achieving effective dynamic and static pressure conversion. Consequently, with a specific volute length, a larger airflow level and a lower noise level are obtained, thus improving noise at the same airflow rate.

[0093] Similarly, the ratio of the axial dimension L of the lower outlet 21b to the axial length B of the impeller 1 is in the range of [1.15, 1.3]. This reduces vortex losses at the impeller blade tip while ensuring a relatively reasonable fan outlet area, further achieving effective dynamic and static pressure conversion. Consequently, with a specific volute length, a larger air volume and lower noise level are obtained, thus improving noise at the same air volume.

[0094] like Figure 14 As shown, the wind turbine 1 of this embodiment includes a blade 11. The blade 11 is an arc-shaped curved blade, imitating the wing shape of a long-eared owl. Compared with existing wind turbine structures, this blade structure can avoid airflow separation from the air inlet end of the blade, thereby improving the efficiency of the blade and reducing noise.

[0095] like Figure 1 As shown, the volute 1 of this utility model embodiment also includes volute collectors 22 disposed at both ends of the axial direction of the volute body 21.

[0096] like Figure 15 As shown, this utility model embodiment also provides a ducted air conditioner, including a housing 100, a heat exchanger, and the aforementioned fan 10, with the fan 10 disposed within the housing 100. In some embodiments, the fan 10 includes a centrifugal fan.

[0097] In some embodiments, the air conditioner includes at least two fans 10 arranged in parallel.

[0098] like Figure 18As shown, by using the fan of this embodiment of the utility model, the noise of the variable-direction air outlet duct air conditioner is basically the same as that of the comparative duct air conditioner (non-variable-direction air outlet), thus the noise is greatly reduced.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A fan, characterized in that, Includes a volute (2), said volute (2) comprising: The volute body (21) has a side air outlet (21a) on the side and a bottom air outlet (21b) on the bottom; and A movable inner shell (23) is disposed inside the volute body (21) and has a vent (23a). The movable inner shell (23) is rotatably disposed relative to the volute body (21) about the axis of the fan so that the fan can switch between a side air outlet state and a bottom air outlet state. In the side air outlet state, the vent (23a) communicates with the side air outlet (21a) to form a side air outlet duct (O1) for supplying cold air. In the bottom air outlet state, the vent (23a) communicates with the bottom air outlet (21b) to form a bottom air outlet duct (O2) for supplying hot air. In this case, on a plane perpendicular to the axis of the fan, the projection of the side outlet duct (O1) forms a side outlet volute profile, and the projection of the lower outlet duct (O2) forms a lower outlet volute profile. The side outlet volute profile and the lower outlet volute profile have different shapes.

2. The fan according to claim 1, characterized in that, The air outlet direction of the side air outlet (O1) is inclined upward relative to the horizontal line (X).

3. The fan according to claim 2, characterized in that, The side-exit volute profile includes a first side-exit profile and a second side-exit profile respectively disposed on both sides of the side-exit duct (O1). The first side-exit profile includes a first side-exit straight section (211) located at one end of the side-exit outlet (21a), and the second side-exit profile includes a second side-exit straight section (210) located at one end of the side-exit outlet (21a). The first side-exit straight section (211) is inclined upward relative to the horizontal line; and / or, the second side-exit straight section (210) is inclined upward relative to the horizontal line.

4. The fan according to claim 3, characterized in that, The angle α1 between the first side air outlet straight segment (211) and the horizontal line is [5°, 30°]; and / or, the angle Ф1 between the second side air outlet straight segment (210) and the horizontal line is [20°, 55°].

5. The fan according to claim 3, characterized in that, The first side air outlet profile also includes a first side air outlet curved section (212) connected to the first side air outlet straight section (211), and the first side air outlet curved section (212) protrudes outward.

6. The fan according to claim 5, characterized in that, The projection of the fan's axis onto the vertical plane forms a center point (O). In the circumferential direction centered on the center point (O), the area covered by the first side air outlet curve segment (212) is greater than the area covered by the first side air outlet straight segment (211).

7. The fan according to claim 6, characterized in that, The angle between the first end of the first side air outlet straight segment (211) and the first line connecting the center point (O) and the second end of the first side air outlet straight segment (211) and the second line connecting the center point (O) is the first included angle Ω1. The angle between the first end of the first side air outlet profile and the third line connecting the center point (O) and the second end of the first side air outlet profile and the fourth line connecting the center point (O) is the second included angle Ω11. The fourth line coincides with the second line. The first ratio between the first included angle Ω1 and the second included angle Ω11 is in the range of [0.3, 0.7].

8. The fan according to claim 7, characterized in that, The angle between the first end of the first side air outlet profile and the third line connecting the center point (O) and the second end of the first side air outlet profile and the fourth line connecting the center point (O) is the second angle Ω11, which ranges from [75°, 100°].

9. The fan according to claim 3, characterized in that, The second side air outlet profile also includes a second side air outlet curve segment disposed on the side away from the side air outlet (21a) of the second side air outlet straight segment (210), and the angle β1 between the tangent of the second side air outlet curve segment intersecting the axis and the horizontal line is [-15°, 15°].

10. The fan according to claim 1, characterized in that, The lower air outlet volute profile is flared at one end of the lower air outlet (21b).

11. The fan according to claim 10, characterized in that, The lower air outlet volute profile includes a first lower air outlet profile and a second lower air outlet profile respectively disposed on both sides of the lower air outlet duct (O2). The first lower air outlet profile includes a first lower air outlet straight segment (214) located at one end of the lower air outlet (21b), and the angle α2 between the first lower air outlet straight segment (214) and the vertical line is in the range of [0°, 15°]; and / or, the second lower air outlet profile includes a second lower air outlet straight segment (213) located at one end of the lower air outlet (21b), and the angle Ф2 between the second lower air outlet straight segment (213) and the vertical line is in the range of [2°, 25°].

12. The fan according to claim 10, characterized in that, The lower air outlet volute profile includes a first lower air outlet profile and a second lower air outlet profile respectively disposed on both sides of the lower air outlet duct (O2). The first lower air outlet profile includes a first lower air outlet straight section (214) located at one end of the lower air outlet (21b) and a first lower air outlet curved section (215) disposed on the side of the first lower air outlet straight section (214) away from the lower air outlet (21b). The first lower air outlet curved section (215) protrudes outward.

13. The fan according to claim 12, characterized in that, The projection of the fan's axis onto the vertical plane forms a center point (O). In the circumferential direction centered on the center point (O), the area covered by the first lower air outlet curve segment (215) is greater than the area covered by the first lower air outlet straight segment (214).

14. The fan according to claim 13, characterized in that, The angle between the first end of the first downward air outlet straight segment (214) and the fifth line connecting the center point (O) and the second end of the first downward air outlet straight segment (214) and the sixth line connecting the center point (O) is the third included angle Ω2. The angle between the first end of the first downward air outlet profile and the seventh line connecting the center point (O) and the second end of the first downward air outlet profile and the eighth line connecting the center point (O) is the fourth included angle Ω22. The eighth line coincides with the sixth line. The range of the second ratio between the third included angle Ω2 and the fourth included angle Ω22 is [0.35, 0.65].

15. The fan according to claim 14, characterized in that, The range of the fourth included angle Ω22 is [70°, 105°].

16. The fan according to claim 10, characterized in that, The lower air outlet volute profile includes a first lower air outlet profile and a second lower air outlet profile respectively disposed on both sides of the lower air outlet duct (O2). The second lower air outlet profile includes a second lower air outlet straight section (213) located at one end of the lower air outlet (21b) and a second lower air outlet curved section disposed on the side of the second lower air outlet straight section (213) away from the lower air outlet (21b). The angle β2 between the tangent of the second lower air outlet curved section intersecting the axis and the vertical line is [12°, 40°].

17. The fan according to any one of claims 1 to 16, characterized in that, The fan also includes a wind turbine (1), which is disposed inside the movable inner shell (23). The axial length (B) of the wind turbine (1) is greater than the diameter (D2) of the wind turbine (1).

18. The fan according to claim 17, characterized in that, The ratio between the axial length (B) of the wind turbine (1) and the diameter (D2) of the wind turbine (1) is in the range of [1.02, 1.42].

19. The fan according to claim 17, characterized in that, The ratio between the diameter (D2) of the impeller (1) and the height (H) of the volute body (21) ranges from [0.63, 0.76].

20. The fan according to claim 17, characterized in that, The ratio of the dimension (L) of the side air outlet (21a) in the axial direction of the fan to the axial length (B) of the impeller (1) is in the range of [1.15, 1.3]; and / or, the ratio of the dimension (L) of the lower air outlet (21b) in the axial direction of the fan to the axial length (B) of the impeller (1) is in the range of [1.15, 1.3].

21. The fan according to any one of claims 1 to 16, characterized in that, The wind turbine also includes a wind turbine (1), the blades of which are constructed in the shape of a long-eared owl.

22. The fan according to claim 1, characterized in that, During the switching between side air outlet and bottom air outlet states, the rotation angle θ of the movable inner shell (23) ranges from [90° to 140°].

23. A ducted air conditioner, characterized in that, It includes a housing, a heat exchanger, and a fan as described in any one of claims 1 to 22, the fan being disposed within the housing.

24. The ducted air conditioner according to claim 23, characterized in that, The air conditioner includes at least two fans connected in parallel.

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