Fan and air duct type air conditioner

Abstract

The invention 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. The working noise of the fan is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a fan and a duct type air conditioner. Background Art

[0002] At present, duct air conditioners have the problems of slow heating and poor heating comfort. When using, users often use guide plates or adjust the angle of the air outlet sweeping plate to improve the above problems, but this will increase the energy consumption of the air conditioner. To address this problem, a better solution is to use a fan with variable air flow, but the pneumatic noise of a variable air fan is relatively high.

[0003] It should be noted that the statements in this background technology section only provide background technology related to the present invention and do not necessarily constitute prior art. Summary of the invention

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

[0005] A first aspect of the present invention provides a fan, comprising a volute, the volute comprising:

[0006] A volute body having a side air outlet located on the side and a lower air outlet located on the bottom; and

[0007] The movable inner shell is arranged on the inner side of 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 to switch the fan between a side air outlet state and a bottom air outlet state. In the side air outlet state, the vent is connected with the side air outlet to form a side air outlet duct for sending cold air; in the bottom air outlet state, the vent is connected with the bottom air outlet to form a bottom air outlet duct for sending hot air.

[0008] Among them, on the 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 lower outlet duct forms the lower outlet volute profile. The shapes of the side outlet volute profile and the lower outlet volute profile are different.

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

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

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

[0012] In some embodiments, the first side air outlet profile line further includes a first side air outlet curve segment connected to the first side air outlet straight segment, and the first side air outlet curve segment protrudes outward.

[0013] In some embodiments, the projection of the axis of the fan in the vertical plane forms a center point, and in the circumferential direction with the center point as the center, the range covered by the first side air outlet curve segment is larger than the range covered by the first side air outlet straight line segment.

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

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

[0016] In some embodiments, the second side air outlet profile line also includes a second side air outlet curve segment arranged on the side of the second side air outlet straight segment away from the side air outlet, and the angle between the tangent line of the second side air outlet curve segment intersecting the axis and the horizontal line is [-15°, 15°].

[0017] In some embodiments, the end of the lower air outlet volute profile located at the lower air outlet is formed into a flared shape.

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

[0019] In some embodiments, the downwind air outlet profile includes a first downwind air outlet profile and a second downwind air outlet profile respectively arranged on both sides of the downwind air outlet duct, wherein the first downwind air outlet profile includes a first downwind air outlet straight line segment located at one end of the downwind outlet and a first downwind air outlet curved segment arranged on a side of the first downwind air outlet straight line segment away from the downwind outlet, and the first downwind air outlet curved segment protrudes outward.

[0020] In some embodiments, the projection of the axis of the fan in the vertical plane forms a center point, and in the circumferential direction with the center point as the center, the range covered by the first lower air outlet curve segment is larger than the range covered by the first lower air outlet straight line segment.

[0021] In some embodiments, the angle between the fifth line connecting the first end of the first downwind straight line segment and the center point and the sixth line connecting the second end of the first downwind straight line segment and the center point is the third angle, the angle between the seventh line connecting the first end of the first downwind profile line and the center point and the eighth line connecting the second end of the first downwind profile line and 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 angle ranges from [70°, 105°].

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

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

[0025] In some embodiments, the ratio of the axial length of the wind rotor to the diameter of the wind rotor is in the range of [1.02, 1.42].

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

[0027] In some embodiments, the ratio of the size of the side air outlet in the axial direction of the fan to the axial length of the wind wheel is in the range of [1.15, 1.3]; and / or, the ratio of the size of the lower air outlet in the axial direction of the fan to the axial length of the wind wheel is in the range of [1.15, 1.3].

[0028] In some embodiments, the wind turbine further comprises a wind rotor, and the blades of the wind rotor are configured to imitate the airfoil of a long-eared owl.

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

[0030] A second aspect of the present invention provides a duct-type air conditioner, comprising a casing, a heat exchanger and the above-mentioned fan, wherein the fan is arranged in 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 the present invention, the fan includes a volute. The volute includes a volute body and a movable inner shell. The volute body has a side air outlet located on the side and a lower air outlet located on the bottom. The movable inner shell is arranged on the inner side of the volute body and the movable inner shell has a vent. The movable inner shell is rotatably arranged around the axis of the fan relative to the volute body so that the fan can switch between a side air outlet state and a lower air outlet state. In the side air outlet state, the vent is connected with the side air outlet to form a side air outlet duct for sending cold air. In the lower air outlet state, the vent is connected with the lower air outlet to form a lower air outlet duct for sending hot air. In the plane perpendicular to the axis of the fan, the projection of the side air outlet duct forms a side air outlet volute profile. The projection of the lower air outlet duct forms a lower air outlet volute profile. The side air outlet volute profile and the lower air outlet volute profile are different in shape. The fan of the present invention sets the shape of the side outlet volute profile of the side outlet duct and the shape of the lower outlet volute profile of the lower outlet duct to be different, so that the shape of the side outlet duct is matched with the downstream cooling air duct, and the lower outlet duct is matched with the upstream heating air duct, so that the fans operate in a better working range under their respective matching air ducts, thereby improving the aerodynamic performance of the fan and reducing working noise.

[0033] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0035] Figure 1 The figure is a schematic diagram of the exploded structure of a fan according to an embodiment of the present invention.

[0036] Figure 2 It is a schematic structural diagram of the fan according to an embodiment of the present invention when it is in a side air outlet state.

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

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

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

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

[0041] Fig.11 It is a schematic diagram of the three-dimensional structure of the volute according to an embodiment of the present invention.

[0042] Fig.12 It is a schematic projection diagram of the volute of an embodiment of the present invention on a plane perpendicular to the shaft.

[0043] Fig.13 It is a schematic diagram of the three-dimensional structure of a wind wheel of a wind turbine according to an embodiment of the present invention.

[0044] Fig.14 for Fig.13 Schematic diagram of the partial structure of the wind wheel shown.

[0045] Fig.15 Schematic diagram of the structure of a duct air conditioner according to an embodiment of the present invention.

[0046] Fig.16 for Fig.15 The structural diagram of the duct air conditioner in the AA direction when the air is discharged from the side is shown.

[0047] Fig.17 for Fig.15 The structural diagram of the duct air conditioner in the AA direction when the air is discharged downward.

[0048] Fig.18 The noise test results of the duct air conditioner according to the embodiment of the present invention are shown in FIG. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0051] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, and the spatially relative descriptions used here are interpreted accordingly.

[0052] refer to Figures 1 to 3 First, the structure and working process of the fan of some embodiments of the present invention are described.

[0053] like Figure 1 As shown, the wind turbine of some embodiments of the present invention includes a wind wheel 1 and a volute 2. The volute 2 includes a volute body 21 and a movable inner shell 23 disposed in the volute body 21. Figure 1 As shown, the volute body 21 has a side air outlet 21a located on the side and a lower air outlet 21b located on the bottom. Moreover, 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 gap in the circumferential direction, and the gap forms a vent 23a. The movable inner shell 23 is arranged in the cylindrical cavity of the volute body 21 and can rotate around the axis of the cylindrical cavity, so that the vent 23a can be rotated to a position connected with the side air outlet 21a to form a side air outlet; or rotated to a position connected with the lower air outlet 21b to form a lower air outlet.

[0054] Among them, a rotating assembly for driving the movable inner shell 23 to rotate may 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 provided on the outer wall surface of the movable inner shell 23 and a gear provided on the inner side of the volute body 21, and the rotation of the movable inner shell 23 is achieved by the meshing transmission between the gear and the arc-shaped rack. Of course, in some other embodiments, the driving structure may also be provided at the collector 22. The present invention is not limited to this.

[0055] In some embodiments, the side air outlet is used in the cooling mode. The bottom air outlet is used in the heating mode. In this way, in the cooling mode, the side air outlet can prevent the cold air from blowing directly on the human body, thereby increasing comfort. In the heating mode, the bottom air outlet allows the hot air to quickly reach the lower part of the room, allowing the user to quickly feel the hot air, thereby improving the problem of slow heating.

[0056] During the research process, the inventor discovered that the use of the above-mentioned variable-direction air outlet fan can indeed improve the problems of slow heating and direct cold air blowing, but when the variable-direction air outlet fan switches between side air outlet and bottom air outlet, the direction of the air duct of the air outlet changes, that is, the direction of the airflow will also change, which leads to the side and bottom air outlet noises being different, and the side and bottom air outlet noises are closely dependent on their respective airflow organizations. At the same time, the drive components of the movable inner shell 23 need to occupy a certain space, which further deteriorates the return air environment of the fan. In order to ensure a good overlap between the movable inner shell and the side and bottom air outlet volute body 21, the volute body 21 is also severely limited in the design freedom of the two end faces along the axis. In addition, the problem that the moving and static parts cannot be completely sealed will significantly deteriorate the working noise of the fan. In response to the problem of loud noise, the inventors of the present invention discovered through in-depth research that there are significant differences in the airflow organization within the side outlet duct and the bottom outlet duct. However, in the related art, the structure of the air outlet duct on the volute body during side outlet and bottom outlet is the same. There is an obvious mismatch in the airflow organization of the fan and its air duct, which in turn causes the problem of loud fan noise.

[0057] Based on the above findings, the present invention adopts a differentiated design for the structures of the side and bottom air outlet ducts to obtain better aerodynamic performance of the fan and thus reduce working noise.

[0058] Reference below Figures 1 to 14 The structure and working process of the fan in some embodiments of the present invention are described in detail.

[0059] refer to Figures 1 to 3Some embodiments of the present invention provide 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 air outlet 21a located on the side and a lower air outlet 21b located on the bottom. The movable inner shell 23 is arranged on the inner side of the volute body 21 and the movable inner shell 23 has a vent 23a. The movable inner shell 23 is rotatably arranged around the axis of the fan relative to the volute body 21 to enable the fan to switch between a side air outlet state and a lower air outlet state. In the side air outlet state, the vent 23a is connected with the side air outlet 21a to form a side air outlet duct O1 for delivering cold air. In the lower air outlet state, the vent 23a is connected with the lower air outlet 21b to form a lower air outlet duct O2 for delivering hot air.

[0060] Among them, on the plane perpendicular to the axis of the fan, the projection of the side outlet duct O1 forms the side outlet volute profile. The projection of the lower outlet duct O2 forms the lower outlet volute profile. The side outlet volute profile and the lower outlet volute profile are different in shape.

[0061] The fan in the embodiment of the present invention sets the shape of the side outlet volute profile of the side outlet duct O1 and the shape of the lower outlet volute profile of the lower outlet duct O2 to be different, so that the shape of the side outlet air duct O1 matches the downstream cooling air duct, and the lower outlet air duct O2 matches the upstream heating air duct, so that the fans operate in the optimal working range under their respective matching air ducts, thereby improving the aerodynamic performance of the fan and reducing working noise.

[0062] The axis of the fan mentioned above refers to the rotation axis of the fan wheel 1. Figure 1 As shown, the wind turbine comprises a wind wheel 1. The wind wheel 1 is a cylindrical structure and rotates around its own axis.

[0063] Figure 2 What is shown is the projection of the volute 2 of some embodiments of the present invention on a plane perpendicular to the axis. It includes the side outlet volute profile of the side outlet duct O1 and the lower outlet volute profile of the lower outlet duct O2. In the following description, the "plane perpendicular to the axis" is referred to as the axis vertical plane. The axis vertical plane has mutually perpendicular horizontal lines and vertical lines. In the following description, the shape of the volute profile will be specifically described with reference to the horizontal line and the vertical line.

[0064] like Figure 4 As shown, in some embodiments, the movable inner casing 23 is rotatably arranged around the axis relative to the volute body 21 so that the fan can switch between the side air outlet state and the bottom air outlet state.

[0065] In some embodiments, when the movable inner shell 23 switches between the side outlet state and the bottom outlet state, the range of the rotation angle θ of the movable inner shell 23 is [90°, 140°]. Considering that there are large differences in airflow organization between the side outlet duct and the bottom outlet duct of the air conditioner, when the rotation angle θ is small, assuming that the end of the volute 213 remains fixed, the side outlet fan has a poor outlet angle, which is likely to cause large flow loss in the side outlet duct and serious air volume attenuation. At the same time, when the air is discharged from the bottom, assuming that the end of the volute 210 remains fixed, the bottom outlet direction is closer to the return air port, which is likely to cause a short circuit in the airflow organization; when the angle θ is large, the side outlet duct flow loss will also increase due to the poor outlet angle of the fan, and the bottom outlet will easily blow directly against the wall, resulting in increased additional flow loss. Therefore, there is a preferred range of the rotation angle θ of the movable inner shell 23 around the axis to take into account the best air supply form of the two airflow organizations, and the preferred range is [90°, 140°].

[0066] refer to Figure 2 In some embodiments, the air outlet direction of the side air outlet duct O1 is inclined upward relative to the horizontal line. The air outlet direction of the side air outlet duct O1 mentioned here refers to the approximate extension direction of the center line of the side air outlet duct O1. Figure 2 It can be seen that in some embodiments, the air outlet direction of the side outlet duct O1 is set to be tilted upward relative to the horizontal line, so that the cold air blows out from the side outlet duct O1 in an obliquely upward direction, and the horizontal air supply distance is longer, which makes it easier to achieve a "waterfall-type" cooling effect and improve comfort. In addition, setting the air outlet direction of the side outlet duct O1 to be tilted upward can be more compatible with the layout of the downstream heat exchanger, reduce the air duct resistance of the side outlet, and reduce the attenuation of the air volume.

[0067] refer to Fig.16 When the air is discharged from the side, the air flows in from the return air port at the bottom, blows out through the side air outlet of the fan 10, and then flows out through the heat exchanger. In the entire airflow path of the side air outlet, the heat exchanger is one of the core resistance components, so it is necessary to optimize the air outlet direction of the fan 10 to reduce the resistance of the airflow when it flows through the heat exchanger, thereby reducing the resistance, increasing the air volume and reducing power consumption.

[0068] like Figure 1 As shown, the movable inner shell 23 has an arc-shaped main body and a first lap end 230 and a second lap end 231 respectively arranged at both ends of the arc-shaped main body. The first lap end 230 includes a volute tongue fillet connected to the arc-shaped main body and a first lap portion overlapped on the volute body 21. The volute tongue fillet protrudes toward the inside of the movable inner shell 23. The second lap end 231 includes a second lap portion connected to the arc-shaped main body.

[0069] like Figure 2As shown, in the side outlet state, the volute tongue fillet portion of the first end 230 of the movable inner casing 23 forms a part of the side outlet duct O1 . The other part of the side outlet duct O1 is formed by the volute body 21 .

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

[0071] The first side outlet air profile is located at the lower side of the side outlet air duct O1. The second side outlet air profile is located at the upper side of the side outlet air duct O1. The first side outlet air profile is formed by the volute body 21. The second side outlet air profile is formed by the volute body 21 and the fillet of the volute tongue of the movable inner shell 23. The first side outlet air straight section 211 is set to be inclined upward relative to the horizontal line, so that the cold air can be blown outward along the inner wall of the first side outlet air straight section 211 when it is blown out. Fig.16 At this time, the airflow blown out by the fan matches the layout of the downstream heat exchanger, reducing the flow loss of the heat exchanger components, increasing the air volume at the same speed, and thus achieving noise reduction at the same air volume. At the same time, it also avoids the generation of secondary sound sources downstream of the fan and increases the radiation noise. Similarly, the second side air outlet straight section 210 is set to be inclined upward relative to the horizontal line, forming a better air outlet pressure diffusion channel with the first side air outlet straight section 211, which not only ensures the rapid dynamic and static pressure conversion of the high-speed airflow, but also avoids the vortex shedding noise caused by the large pressure diffusion gradient.

[0072] In some embodiments, the angle between the first side air outlet straight segment 211 and the horizontal line is smaller than the angle between the second side air outlet straight segment 210 and the horizontal line. That is to say, the upward inclination of the second side air outlet straight segment 210 located on the upper side of the side air outlet duct O1 is greater than the upward inclination of the first side air outlet straight segment 211 located on the lower side of the side air outlet duct O2. The upward inclination of the second side air outlet straight segment 210 should be consistent with the direction of the high-speed airflow blown out by the wind wheel at the volute tongue, and at the same time, there must be a certain degree of expansion pressure to reduce the dynamic pressure at the fan outlet and avoid large flow losses downstream. Therefore, its inclination needs to consider the direction of the high-speed airflow blown out by the impeller, the appropriate expansion pressure gradient, and the degree of matching with the downstream heat exchanger components; while the upward inclination of the first side air outlet straight segment 211 mainly considers the direction of the high-speed airflow blown out by the impeller and the degree of matching with the downstream heat exchanger components. Therefore, usually, the angle between the first side air outlet straight line segment 211 and the horizontal line is smaller than the angle between the second side air outlet straight line segment 210 and the horizontal line.

[0073] like Figure 5 As shown, in some embodiments, the angle α1 between the first side air outlet straight line segment 211 and the horizontal line is [5°, 30°]. And / or, Figure 6 As shown, the angle Φ1 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 the upper and lower end surfaces that contact the shell need to be sealed, when it is arranged in the shell, the airflow cannot circulate within a certain distance close to the upper and lower end surfaces of the heat exchanger. At the same time, when the air is discharged from the side, the airflow blown out by the fan should be radiated to the windward surface of the entire 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 at [5°, 30°], it can effectively reduce the flow loss of the heat exchanger, increase the air volume, and reduce noise; at the volute tongue, the high-speed airflow blown out by the fan blades is usually blown out at a certain angle with the horizontal line due to the circumferential speed component in its speed. Therefore, when the angle Φ1 between the second side air outlet straight section 210 and the horizontal line is small, the high-speed airflow will directly impact the wall surface 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 second side outlet straight section 210 will generate a large adverse pressure gradient, resulting in flow separation and vortex shedding in the vicinity, which reduces the effective flow area and radiates a large amount of noise. When Ф1 is [20°, 55°], the direction of the high-speed airflow blown out by the impeller, the reasonable design of the pressure diffusion gradient, and the good matching with the downstream heat exchanger components can be taken into account at the same time, thereby achieving better aerodynamic performance and lower fan operating noise as a whole.

[0074] like Figure 7 As shown, in some embodiments, the first side outlet air profile line also includes a first side outlet curve segment 212 connected to the first side outlet straight segment 211, and the first side outlet curve segment 212 protrudes outward. The first side outlet curve segment 212 serves as the starting segment of the side outlet air duct O1 and protrudes outward. On the one hand, it can serve as an installation limit for the movable inner shell 23; on the other hand, it can smoothly connect the movable inner shell 23 and the first side outlet straight segment 211 in a confined space, thereby making the flow smooth and transitionally smooth, avoiding the generation of vortices and radiation noise.

[0075] like Figure 7As shown, the first side outlet air profile includes a first side outlet curve segment 212 and a first side outlet straight segment 211 that are smoothly connected. The first end of the first side outlet curve segment 212 forms the first end of the first side outlet air profile, the second end of the first side outlet curve segment 212 is smoothly connected to the first end of the first side outlet straight segment 211, and the second end of the first side outlet straight segment 211 forms the second end of the first side outlet air profile. The projection of the axis of the fan in the vertical plane of the axis forms a center point O. In the circumferential direction with the center point O as the center, the range covered by the first side outlet curve segment 212 is greater than the range covered by the first side outlet straight segment 211. This arrangement can ensure that the first side outlet straight segment 211 is reasonably and fully tilted upward, avoid increasing flow losses, and reduce air volume. At the same time, within the limited range of specific structural dimensions, the space utilization of the first side outlet curve segment 212 can be increased, which can also reduce flow resistance, smooth airflow, and reduce noise.

[0076] The angle between the first end of the first side outlet straight line segment 211 and the center point O and the second line between the second end of the first side outlet straight line segment 211 and the center point O is the first angle Ω1. The angle between the third line between the first end of the first side outlet profile and the center point O and the fourth line between the second end of the first side outlet profile and the center point O is the second angle Ω11. The fourth line coincides with the second line. The range of the second angle Ω11 is [75°, 100°]. The range of the first ratio between the first angle Ω1 and the second angle Ω11 is [0.3, 0.7]. Within this angle range and ratio range, the coordinated maximization of structural space size utilization, flow resistance reduction and turbulent noise suppression can be achieved, and a better aerodynamic noise reduction design can be obtained.

[0077] like Figure 5 As shown, in some embodiments, the second side air outlet profile line also includes a second side air outlet curve segment arranged on the side of the second side air outlet straight segment 210 away from the side air outlet 21a, and the angle β1 between the tangent through the center point O of the second side air outlet curve segment and the horizontal line is [-15°, 15°]. When the angle β1 is small, the volute tongue is a shallow tongue design, the wind wheel is more exposed, and it is easier to radiate noise while deteriorating the aerodynamic performance of the fan. 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 greater noise. The angle β1 in the present invention is [-15°, 15°], which well takes into account the advantages of the deep and shallow tongues, achieves a large air volume, and the noise radiation efficiency is relatively lower, thereby optimizing and improving the overall working noise of the fan.

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

[0079] refer to Figure 3In some embodiments, the end of the lower air outlet volute profile located at the lower air outlet 21b is flared. The flared shape means that the cross-sectional area of ​​the air outlet end of the lower air outlet duct O2 is set larger, forming a trumpet shape. This setting can make full use of the structural space during the lower air outlet, increase the flow channel area when the hot air is blown out, and then increase the air volume of the hot air, so that the user can feel the hot air more quickly, and further improve the problem of slow heating. Moreover, the air outlet end is set larger, the high-speed airflow is more fully expanded, the dynamic pressure loss is smaller, and the air outlet noise is further reduced.

[0080] In some embodiments, the lower air outlet volute profile includes a first lower air outlet profile and a second lower air outlet profile that are respectively arranged on both sides of the lower air outlet duct O2. Fig. 9 As shown, the first lower air outlet profile includes a first lower air outlet straight line segment 214 located at one end of the lower air outlet 21b, and the angle α2 between the first lower air outlet straight line segment 214 and the vertical line is in the range of [0°, 15°]. And / or, as Figure 8 As shown, the second lower air outlet profile line includes a second lower air outlet straight line segment 213 located at one end of the lower air outlet 21b, and the included angle Φ2 between the second lower air outlet straight line segment 213 and the vertical line is in the range of [2°, 25°].

[0081] Furthermore, reference Fig.17 The range of the 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 toward the return air side, thereby causing the air outlet and return air flow to short-circuit the air conditioning unit. At the same time, the range of the angle α2 between the first lower air outlet straight section 214 and the vertical line is set to [0°, 15°]. It can ensure that the high-speed airflow obtains more sufficient pressure expansion without impacting the downstream wall, thereby reducing dynamic pressure, reducing circulation losses, increasing air volume, and reducing noise. It is also conducive to ensuring the centralized delivery of hot air and improving the problem of poor heating effect.

[0082] like Fig.10 As shown, in some embodiments, the first lower air outlet profile line further includes a first lower air outlet curve segment 215 disposed on a side of the first lower air outlet straight segment 214 away from the lower air outlet 21b. The first lower air outlet curve segment 215 protrudes outward. The first lower air outlet curve segment 215 serves as the starting segment of the lower air outlet duct O2 and protrudes outward, so that the airflow has a larger space when flowing into the lower air outlet duct O2, avoiding the generation of vortices, thereby reducing noise.

[0083] like Fig.10As shown, the first lower air outlet profile includes a first lower air outlet curve segment 215 and a first lower air outlet straight segment 214 that are smoothly connected. The first end of the first lower air outlet curve segment 215 forms the first end of the first lower air outlet profile, the second end of the first lower air outlet curve segment 215 is smoothly connected to the first end of the first lower air outlet straight segment 214, and the second end of the first lower air outlet straight segment 214 forms the second end of the first lower air outlet profile. The projection of the axis of the fan in the vertical plane of the axis forms a center point O. In the circumferential direction with the center point O as the center, the range covered by the first lower air outlet curve segment 215 is larger than the range covered by the first lower air outlet straight segment 214. This arrangement allows the airflow to flow out smoothly within a larger range after entering the lower air outlet duct O2, with less resistance, thereby effectively reducing noise.

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

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

[0086] like Fig. 9 As shown, in some embodiments, the second lower air outlet profile line further includes a second lower air outlet curve 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 through the center point of the second lower air outlet curve segment and the vertical line is [12°, 40°]. With respect to the side air outlet, reference Fig.17 , the overall airflow organization of the downward air outlet is poor, and the air duct resistance is greater. At this time, the fan noise is more affected by the air duct resistance, but is relatively less affected by the exposure of the wind wheel. Therefore, the volute tongue structure should be more inclined to a deep tongue design, which can fully improve the fan's work capacity, but at the same time, the noise increase caused by the deep tongue design itself should also be taken into account. The angle β2 range in the present invention better takes into account the above requirements, ensuring a sufficiently large wind pressure supply and avoiding the noise increase and capacity attenuation caused by an excessively deep tongue design. At the same time, the air outlet is further away from the return air outlet to avoid short-circuiting of the airflow organization.

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

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

[0089] refer to Figure 1 and Fig.13 In some embodiments, the wind turbine further comprises a wind wheel 1. The wind wheel 1 is disposed in the movable inner shell 23. The axial length B of the wind wheel 1 is greater than the diameter D2 of the wind wheel 1. The axial length B of the wind wheel 1 is set to be greater than the diameter D2 of the wind wheel 1, so that the flow rate distributed by the wind wheel per unit axial length can be reduced, thereby reducing the wind speed and reducing the noise.

[0090] In some embodiments, the ratio of the axial length B of the wind wheel 1 to the diameter D2 of the wind wheel 1 is in the range of [1.02, 1.42]. When the ratio is within this range, it can not only reduce the wind speed and reduce the noise, but also avoid the reaction of the blades at the top of the wind wheel blades being too long, which causes the blades to work ineffectively and radiate relatively large noise. Generally speaking, the noise is relatively low within the above ratio range.

[0091] In some embodiments, the ratio of the diameter D2 of the wind wheel 1 to the height H of the volute body 21 is in the range of [0.63, 0.76]. In most air-conditioning units, the fan size is under strong constraints, that is, the relationship between the fan blade diameter and the volute profile cannot meet the theoretical design requirements. A small or large fan blade diameter will cause a rapid deterioration in fan performance and noise level. Therefore, when the ratio of the fan diameter to the height H of the volute body 21 is set to [0.66, 0.72], the optimal design that takes into account both fan performance and noise can be achieved.

[0092] In some embodiments, the ratio of the size L of the side air outlet 21a in the axial direction to the axial length B of the wind wheel 1 is in the range of [1.15, 1.3]. This can make the vortex loss at the top of the wind wheel blade smaller, while ensuring a relatively reasonable fan outlet area, and further achieve effective conversion of dynamic and static pressures. Thus, at a specific volute length, a larger air volume level and a lower noise level are obtained, thereby achieving improvement in noise at the same air volume.

[0093] Similarly, the ratio of the dimension L of the lower air outlet 21b in the axial direction to the axial length B of the wind wheel 1 is in the range of [1.15, 1.3], which can make the vortex loss at the top of the wind wheel blade smaller, while ensuring a relatively reasonable fan outlet area, and further realizing the effective conversion of dynamic and static pressures. Thus, at a specific volute length, a larger air volume level and a lower noise level are obtained, thereby achieving an improvement in noise at the same air volume.

[0094] like Fig.14As shown, the wind wheel 1 of the embodiment of the present invention includes a wind blade 11. The wind blade 11 is an arc-shaped curved blade, imitating the airfoil of a long-eared owl. Compared with the existing wind blade structure, the wind blade structure can avoid the airflow separation on the airfoil surface from the air inlet end of the blade, improve the efficiency of the wind blade, and reduce noise.

[0095] like Figure 1 As shown, the volute 1 of the embodiment of the present invention further includes volute collectors 22 arranged at both axial ends of the volute body 21 .

[0096] like Fig.15 As shown, an embodiment of the present invention further provides a duct type air conditioner, comprising a casing 100, a heat exchanger and the above-mentioned fan 10, wherein the fan 10 is disposed in the casing 100. In some embodiments, the fan 10 comprises a centrifugal fan.

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

[0098] like Fig.18 As shown, by adopting the fan of the embodiment of the present invention, the noise of the duct air conditioner with variable air outlet is basically the same as the noise of the comparative duct air conditioner (without variable air outlet), so the noise is greatly reduced.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A fan, characterized in that: The invention comprises a volute (2), wherein the volute (2) comprises: A volute body (21) having a side air outlet (21a) located on the side surface and a lower air outlet (21b) located on the bottom surface; and a movable inner shell (23), the movable inner shell (23) being arranged on the inner side of the volute body (21) and having a vent (23a), the movable inner shell (23) being rotatably arranged relative to the volute body (21) around the axis of the fan so as to enable the fan to switch between a side air outlet state and a bottom air outlet state, wherein in the side air outlet state, the vent (23a) is connected with the side air outlet (21a) to form a side air outlet duct (O1) for delivering cold air; and in the bottom air outlet state, the vent (23a) is connected with the bottom air outlet (21b) to form a bottom air outlet duct (O2) for delivering hot air; Wherein, on a plane perpendicular to the axis of the fan, the projection of the side air outlet duct (O1) forms a side air outlet volute profile, and the projection of the lower air outlet duct (O2) forms a lower air outlet volute profile, and the side air outlet volute profile and the lower air outlet volute profile are different in shape.

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

3. The fan according to claim 2, characterized in that: The side outlet volute profile comprises a first side outlet profile and a second side outlet profile respectively arranged on two sides of the side outlet duct (O1), wherein the first side outlet profile comprises a first side outlet straight line segment (211) located at one end of the side outlet (21a), and the second side outlet profile comprises a second side outlet straight line segment (210) located at one end of the side outlet (21a), wherein the first side outlet straight line segment (211) is inclined upward relative to a horizontal line; and / or the second side outlet straight line segment (210) is inclined upward relative to a horizontal line.

4. The fan according to claim 3, characterized in that: The included angle (α1) between the first side air outlet straight line segment (211) and the horizontal line is [5°, 30°]; and / or the included angle (Φ1) between the second side air outlet straight line 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 line further comprises a first side air outlet curved segment (212) connected to the first side air outlet straight segment (211), and the first side air outlet curved segment (212) protrudes outwards.

6. The fan according to claim 5, characterized in that: The projection of the axis of the fan in the vertical plane forms a center point (O), and in the circumferential direction with the center point (O) as the center, the range covered by the first side air outlet curve segment (212) is larger than the range covered by the first side air outlet straight segment (211).

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

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

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

10. The fan according to claim 1, characterized in that: One end of the lower air outlet volute profile located at the lower air outlet (21b) is formed into a flared shape.

11. The fan according to claim 10, characterized in that: The lower air outlet profile comprises a first lower air outlet profile and a second lower air outlet profile respectively arranged on two sides of the lower air outlet duct (O2), wherein the first lower air outlet profile comprises a first lower air outlet straight line segment (214) located at one end of the lower air outlet (21b), and the angle (α2) between the first lower air outlet straight line segment (214) and the vertical line is in the range of [0°, 15°]; and / or the second lower air outlet profile comprises a second lower air outlet straight line segment (213) located at one end of the lower air outlet (21b), and the angle (Φ2) between the second lower air outlet straight line 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 profile comprises a first lower air outlet profile and a second lower air outlet profile respectively arranged on two sides of the lower air outlet duct (O2), wherein the first lower air outlet profile comprises a first lower air outlet straight line segment (214) located at one end of the lower air outlet (21b) and a first lower air outlet curved line segment (215) arranged on a side of the first lower air outlet straight line segment (214) away from the lower air outlet (21b), and the first lower air outlet curved line segment (215) protrudes outward.

13. The fan according to claim 12, characterized in that: The projection of the axis of the fan in the vertical plane forms a center point (O), and in the circumferential direction with the center point (O) as the center, the range covered by the first lower air outlet curve segment (215) is larger than the range covered by the first lower air outlet straight segment (214).

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

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

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

17. The fan according to any one of claims 1 to 16, characterized in that: The wind turbine further comprises a wind wheel (1), wherein the wind wheel (1) is arranged in the movable inner shell (23), and an axial length (B) of the wind wheel (1) is greater than a diameter (D2) of the wind wheel (1).

18. The fan according to claim 17, characterized in that: The ratio between the axial length (B) of the wind wheel (1) and the diameter (D2) of the wind wheel (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 wind wheel (1) and the height (H) of the volute body (21) is in the range of [0.63, 0.76].

20. The fan according to claim 17, characterized in that: The ratio of the size (L) of the side air outlet (21a) in the axial direction of the fan to the axial length (B) of the wind wheel (1) is in the range of [1.15, 1.3]; and / or the ratio of the size (L) of the lower air outlet (21b) in the axial direction of the fan to the axial length (B) of the wind wheel (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 further comprises a wind wheel (1), wherein the wind blades of the wind wheel (1) are constructed in a long-eared owl-like airfoil shape.

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

23. A duct type air conditioner, characterized in that: The invention comprises a casing, a heat exchanger and a fan as claimed in any one of claims 1 to 22, wherein the fan is arranged in the casing.

24. The duct type air conditioner according to claim 23, characterized in that: The air conditioner comprises at least two fans arranged in parallel.

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