Fan volute and air conditioner

Abstract

The application discloses a fan volute and an air conditioner. The fan volute comprises a volute body, the volute body is formed with an air inlet, an air outlet and an air duct, the air duct is communicated with the air inlet and the air outlet, the air duct is used for accommodating a fan wheel, and an air duct groove is formed in the inner wall of the air duct. According to the fan volute, the air duct groove is formed in the inner wall of the air duct, the flow area of the air flow in the air duct can be increased, the flow field in the air duct can be improved, the air flow in the air duct is smoother, and thus the noise of the air flow in the air duct can be effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of air conditioning equipment technology, and in particular to a fan casing and an air conditioner. Background Technology

[0002] In related technologies, the fan assembly in air conditioning equipment such as air conditioners includes a fan impeller and a fan casing that houses the impeller. An air duct is formed within the fan casing to facilitate airflow. However, due to the inherent structural limitations of the fan casing, significant noise is generated when airflow occurs within the air duct. Therefore, this issue remains to be addressed. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a fan volute in which a duct groove is formed on the inner wall of the duct, which can increase the flow area of ​​airflow in the duct, improve the flow field in the duct, make the airflow in the duct smoother, and thus effectively reduce the noise of airflow in the duct.

[0004] The present invention also proposes an air conditioner including the above-mentioned fan volute.

[0005] According to a first aspect of the present invention, the fan volute includes a volute body, the volute body having an airflow inlet, an airflow outlet and an air duct, the air duct connecting the airflow inlet and the airflow outlet, the air duct being used to accommodate a fan impeller, and the inner wall of the air duct having an air duct groove.

[0006] According to an embodiment of the present invention, the fan casing has a duct groove formed on the inner wall of the duct, which can increase the flow area of ​​the airflow in the duct, improve the flow field in the duct, make the airflow in the duct smoother, and thus effectively reduce the noise of the airflow in the duct.

[0007] According to some embodiments of the present invention, a portion of the fan casing protrudes outward to form a duct bulge, and the duct groove is formed on the inner side of the duct bulge.

[0008] According to some embodiments of the present invention, a portion of the wind turbine casing protrudes outward along the axial direction of the wind turbine to form the duct bulge.

[0009] According to some embodiments of the present invention, the depth of the air duct groove in the axial direction of the impeller is t, and the depth of the portion of the volute body that does not form the air duct groove in the axial direction of the impeller is w, where t and w satisfy: w / 20≤t≤w / 8.

[0010] According to some embodiments of the present invention, t and w further satisfy: w / 16≤t≤w / 12.

[0011] According to some embodiments of the present invention, the portion of the volute body that does not form the air duct protrusion is the volute body portion, and the air duct protrusion and the volute body portion are connected by a transition surface, which is a curved surface.

[0012] According to some embodiments of the present invention, in the direction from the duct bulge to the volute body, the extension trajectory of the transition surface is a transition curve, and the transition curve satisfies a cubic Bézier curve.

[0013] According to some embodiments of the present invention, at least a portion of the duct groove extends circumferentially along the impeller.

[0014] According to some embodiments of the present invention, the lines connecting the two circumferential ends of the duct groove to the center of the impeller are respectively a first line and a second line, the angle between the first line and the second line is a first angle, the duct groove is located within the range of the first angle, and the first angle is greater than or equal to 90°.

[0015] According to some embodiments of the present invention, the first included angle ranges from 150° to 270°.

[0016] According to some embodiments of the present invention, the air duct includes a communicating impeller cavity and an air outlet channel. The impeller cavity is used to accommodate the impeller. The air outlet channel is located radially outside the impeller cavity. The air outlet side of the air outlet channel constitutes the airflow outlet. The impeller cavity includes a first sidewall and a second sidewall disposed opposite to each other along the axial direction of the impeller. The airflow inlet is formed in the first sidewall. The air duct groove is located on the outer periphery of the airflow inlet and at least a portion of the air duct groove is located inside the impeller cavity.

[0017] According to some embodiments of the present invention, at least a portion of the air duct groove extends circumferentially along the airflow inlet.

[0018] According to some embodiments of the present invention, the width of the duct groove in the radial direction of the impeller gradually increases in the extending direction of the duct groove and in the direction close to the air outlet channel.

[0019] According to some embodiments of the present invention, in the extending direction of the air duct groove, the air duct groove has a first end and a second end, the first end being located inside the impeller cavity and the second end being located inside the air outlet channel.

[0020] According to some embodiments of the present invention, the airflow inlet is circular, and the air duct groove includes a first groove segment, the first groove segment being located on the outer periphery of the airflow inlet and the extension trajectory of the first groove segment being an arc.

[0021] According to some embodiments of the present invention, it further includes an air guide ring, which is disposed on the outer surface of the first sidewall and surrounds the airflow inlet;

[0022] The air duct protrusion is located on the outer periphery of the air guide ring. The air duct protrusion includes a first protrusion, and the first groove segment is formed on the inner side of the first protrusion. The distance d between the first protrusion and the air guide ring satisfies: 0mm≤d≤15mm.

[0023] According to some embodiments of the present invention, the air duct groove includes a second groove segment connected to one end of the first groove segment near the air outlet channel, and the second groove segment extends from the impeller cavity into the air outlet channel.

[0024] According to some embodiments of the present invention, the air outlet channel includes a first air outlet wall and a second air outlet wall disposed opposite to each other. A volute tongue is connected to one end of the second air outlet wall adjacent to the impeller cavity. The side wall of the second groove segment near the second air outlet wall is a third side wall. In the direction from the bottom wall of the second groove segment to the opening of the second groove segment, the third side wall extends obliquely toward the direction close to the airflow inlet or the second air outlet wall.

[0025] According to some embodiments of the present invention, the air duct profile of the volute body includes a volute tongue segment, a first arc segment, a second arc segment, a third arc segment, and an outlet straight segment. The volute tongue segment, the first arc segment, the second arc segment, the third arc segment, and the outlet straight segment extend circumferentially along the volute body and are connected sequentially. The first arc segment, the second arc segment, and the third arc segment are concentrically arranged and their radii increase sequentially. At least a portion of the air duct groove is formed in the third arc segment and the outlet straight segment.

[0026] According to some embodiments of the present invention, the design flow rate of the fan casing is Q, the base circle radius of the casing body is R2, and the center of the base circle of the casing body is A, C. 2u The tangential velocity component of the blades is given in actual conditions. θ is the polar coordinate angle variable of the base circle of the volute body, and θ∈[0,2π]. The air duct groove includes a fourth sidewall and a fifth sidewall arranged opposite to each other. The fifth sidewall is located on the side of the fourth sidewall away from the center A of the base circle of the volute body.

[0027] The projection of the fifth sidewall onto the reference plane is the first projection, and the projection of the center A of the base circle of the volute body onto the reference plane is the second projection. The reference plane is perpendicular to the axial direction of the wind turbine, and the distance R between the first projection and the second projection satisfies:

[0028] An air conditioner according to a second aspect of the present invention includes: a housing assembly having an air inlet and an air outlet formed thereon; a fan assembly including a fan impeller and a fan volute according to the first aspect of the present invention, the fan impeller being disposed within the air duct; and a heat exchanger assembly disposed within the housing assembly and located between the fan volute and the air inlet.

[0029] According to an embodiment of the present invention, the air conditioner includes the aforementioned fan volute, and the inner wall of the fan volute has a duct groove, which can increase the flow area of ​​airflow in the duct, improve the flow field in the duct, make the airflow in the duct smoother, and thus effectively reduce the noise of airflow in the duct.

[0030] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0031] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0032] Figure 1 This is a schematic diagram of a portion of the structure of a fan volute according to some embodiments of the present invention;

[0033] Figure 2 yes Figure 1 A schematic diagram of another angle of the structure of the wind turbine volute;

[0034] Figure 3 yes Figure 1 A schematic diagram of another angle of the structure of the wind turbine volute;

[0035] Figure 4 yes Figure 1 A three-dimensional schematic diagram of the volute casing of a wind turbine.

[0036] Figure label:

[0037] 100. Fan casing;

[0038] 1. Volute body; 11. Airflow inlet; 12. Airflow outlet; 13. Air duct; 131. Air duct groove; 1311. First end; 1312. Second end; 1313. First groove section; 1314. Second groove section; 1315. Third side wall; 1316. Fourth side wall; 1317. Fifth side wall; 132. Impeller cavity; 1321. First side wall; 1322. Second side wall; 133. Air outlet channel; 1331. First air outlet wall; 1332. Second air outlet wall; 134. Volute tongue; 14. Volute body; 15. Transition surface; 161. Volute tongue section; 162. First arc section; 163. Second arc section; 164. Third arc section; 165. Straight outlet section;

[0039] 2. Air duct convex hull; 21. First convex hull;

[0040] 3. Air guide ring. Detailed Implementation

[0041] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0042] The following is for reference. Figures 1-4 A fan volute 100 according to an embodiment of the present invention is described.

[0043] Reference Figures 1-4 According to a first aspect embodiment of the present invention, the fan casing 100 includes a casing body 1, which has an airflow inlet 11, an airflow outlet 12, and an air duct 13. The air duct 13 connects the airflow inlet 11 and the airflow outlet 12, and is used to accommodate the impeller. The inner wall of the air duct 13 has an air duct groove 131. The air duct 13 connects the airflow inlet 11 and the airflow outlet 12, facilitating the flow of airflow from the airflow inlet 11 to the airflow outlet 12. When the fan is operating, the impeller drives the airflow outside the fan casing 100 to enter the air duct 13 through the airflow inlet 11 and flow towards the airflow outlet 12.

[0044] By forming a groove 131 on the inner wall of the air duct 13, the flow cross-section of the air duct 13 can be further increased, thereby increasing the flow area of ​​airflow within the air duct 13. This improves the flow field within the air duct 13, making the airflow smoother and reducing noise when the airflow flows within the air duct 13. For example, when the airflow flows within the air duct 13, it can guide the airflow to be distributed more evenly, reducing the accumulation and turbulence of airflow in local areas, and thus reducing noise when the airflow flows within the air duct 13.

[0045] In addition, by increasing the flow cross-section of the air duct 13, the pulsating pressure inside the air duct 13 can be reduced, and the noise of the airflow when it flows inside the air duct 13 can be reduced accordingly.

[0046] Referring to Table 1 below, the data in Table 1 are the air volume and noise values ​​of the fan volute 100 in the related art and the fan volute 100 in the embodiments of the present invention at different speeds.

[0047] Table 1

[0048]

[0049] Table 1 shows that when the impeller speed is 400 r / min, the air volume inside the fan casing 100 in the related technology is 1041 CFM and the noise is 44.3 dBA. In this embodiment of the invention, the air volume inside the fan casing 100 is 1114 CFM and the noise is 42.7 dBA. Compared with the air volume and noise of the fan casing 100 in the related technology, the air volume inside the fan casing 100 in this embodiment of the invention is higher and the noise is effectively reduced. When the impeller speed is 560 r / min, the air volume inside the fan casing 100 in the related technology is 1507 CFM and the noise is 54.6 dBA. In this embodiment of the invention, the air volume inside the fan casing 100 is 1545 CFM and the noise is 51.9 dBA. Compared with the air volume and noise of the fan casing 100 in the related technology, the air volume inside the fan casing 100 in this embodiment of the invention is higher and the noise is effectively reduced.

[0050] The above analysis shows that, when the rotor speed is the same, the air volume inside the fan casing 100 in the embodiment of the present invention is higher and the noise is effectively reduced.

[0051] According to an embodiment of the present invention, the fan casing 100 has a duct groove 131 formed on the inner wall of the duct 13, which can increase the flow area of ​​the airflow in the duct 13, improve the flow field in the duct 13, make the airflow in the duct 13 smoother, and thus effectively reduce the noise of the airflow in the duct 13.

[0052] Reference Figures 1-3 According to some embodiments of the present invention, a portion of the fan volute 100 protrudes outward to form a duct bulge 2, and a duct groove 131 is formed on the inner side of the duct bulge 2. The outward protrusion of the portion of the fan volute 100 facilitates the formation of the duct groove 131 on the inner wall of the fan volute 100, resulting in a larger flow cross-section for airflow within the duct 13. This allows for smoother airflow within the duct 13, effectively reducing noise from the airflow within the duct 13.

[0053] Reference Figures 1-3According to some embodiments of the present invention, a portion of the fan volute 100 protrudes outward along the axial direction of the impeller to form a duct protrusion 2, which can make full use of the external space of the fan volute 100 to expand the volume inside the duct 13, so that a duct groove 131 is formed on the inner wall of the duct 13, thereby increasing the flow cross section of the airflow inside the duct 13, which can reduce the noise when the airflow flows inside the duct 13.

[0054] Reference Figures 1-3 According to some embodiments of the present invention, the depth of the duct groove 131 in the axial direction of the impeller is t, and the depth of the portion of the volute body 1 without the duct groove 131 in the axial direction of the impeller is w, where t and w satisfy: w / 20≤t≤w / 8. For example, t and w can be w / 20, w / 16, w / 12, w / 10, w / 8, etc. By ensuring that t and w are not less than w / 20, the depth of the duct groove 131 can be larger, thereby increasing the flow cross-section of the airflow in the duct 13 and reducing the noise of the airflow in the duct 13. By ensuring that t and w are not greater than w / 8, the abrupt change in the flow cross-section of the duct 13 can be smaller, thereby reducing the surge phenomenon caused by the abrupt change in airflow.

[0055] By satisfying w / 20≤t≤w / 8, the flow cross-section of the airflow in the duct 13 can be increased, thereby reducing the noise of the airflow in the duct 13. Furthermore, the abrupt change in the flow cross-section of the duct 13 can be minimized, thus reducing the surge phenomenon caused by the abrupt change in airflow.

[0056] Reference Figures 1-3 According to some embodiments of the present invention, t and w further satisfy: w / 16 ≤ t ≤ w / 12. For example, t and w can be w / 16, w / 15, w / 13, w / 11, w / 12, etc. By ensuring that t and w are not less than w / 16, the depth of the duct groove 131 can be larger, thereby effectively increasing the flow cross-section of the airflow in the duct 13 and thus effectively reducing the noise of the airflow in the duct 13. By ensuring that t and w are not greater than w / 8, the abrupt change in the flow cross-section of the duct 13 can be smaller, thereby reducing the surge phenomenon caused by the abrupt change in airflow.

[0057] By ensuring that t and w satisfy w / 16≤t≤w / 12, the additional flow cross-section in the air duct 13 and the abrupt change in the flow cross-section in the air duct 13 can be better balanced. This reduces the noise of airflow in the air duct 13 and minimizes the abrupt change in the flow cross-section in the air duct 13, thereby reducing the surge phenomenon caused by abrupt changes in airflow.

[0058] Reference Figures 1-3According to some embodiments of the present invention, the portion of the volute body 1 that does not form the air duct protrusion 2 is the volute body portion 14. The air duct protrusion 2 and the volute body portion 14 are connected by a transition surface 15. The transition surface 15 is curved, which makes the connection between the air duct protrusion 2 and the volute body portion 14 smoother and more unobstructed. This can reduce the separation loss of airflow caused by the sudden change in curvature at the connection between the air duct protrusion 2 and the volute body portion 14, and further reduce the noise caused by the vortex of airflow at the connection between the air duct protrusion 2 and the volute body portion 14.

[0059] Reference Figures 1-3 According to some embodiments of the present invention, in the direction from the air duct protrusion 2 to the volute body 1, the extension trajectory of the transition surface 15 is a transition curve, and the transition curve satisfies a cubic Bézier curve, so that the transition surface 15 between the air duct protrusion 2 and the volute body 1 is a curved surface, thereby making the connection between the air duct protrusion 2 and the volute body 14 smoother and more efficient, thereby effectively reducing the separation loss caused by the sudden curvature change at the connection between the air duct protrusion 2 and the volute body 14.

[0060] Reference Figures 1-3 According to some embodiments of the present invention, the air duct groove 131 and the volute body 14 are connected by a transition surface 15, which is curved, making the connection between the air duct groove 131 and the volute body 14 smoother and more unobstructed. This can reduce the separation loss of airflow caused by the sudden curvature change at the connection between the air duct groove 131 and the volute body 14, and further reduce the noise caused by the vortex of airflow at the connection between the air duct groove 131 and the volute body 14.

[0061] In the direction from the air duct groove 131 to the volute body 1, the extension trajectory of the transition surface 15 is a transition curve. The transition curve satisfies a cubic Bézier curve, making the transition surface 15 between the air duct groove 131 and the volute body 1 a curved surface. This makes the connection between the air duct protrusion 2 and the volute body 14 smoother and more efficient, thereby effectively reducing the separation loss caused by the sudden curvature change at the connection between the air duct protrusion 2 and the volute body 14.

[0062] Reference Figures 1-3 According to some embodiments of the present invention, at least a portion of the duct groove 131 extends circumferentially along the impeller. This extension of at least a portion of the duct groove 131 circumferentially along the impeller may include, for example, a portion of the duct groove 131 extending circumferentially along the impeller; or, for another example, the entire duct groove 131 extending circumferentially along the impeller.

[0063] At least a portion of the duct groove 131 extends along the circumference of the impeller, which can guide the airflow and make the airflow flow along the rotation direction of the impeller. This makes the airflow flow more stably along the circumference of the impeller, which helps to reduce airflow turbulence and eddy generation. This can improve the flow field within the duct 13 over a larger area and effectively reduce the noise of the airflow within the duct 13.

[0064] Reference Figures 1-3 According to some embodiments of the present invention, the lines connecting the two circumferential ends of the wind duct groove 131 to the center of the wind turbine are respectively the first connecting line and the second connecting line, and the angle between the first connecting line and the second connecting line is the first included angle α. The wind duct groove 131 is located within the range of the first included angle α, and the first included angle α is greater than or equal to 90°. For example, the first included angle α can be 90°, 120°, 180°, 240°, 270°, etc. By ensuring that the first included angle α is not less than 90°, the length of the wind duct groove 131 extending along the circumference of the wind turbine can be longer, which can increase the airflow cross section within the wind duct 13 within a larger range around the wind turbine, thus helping to improve the flow field within a larger range around the wind turbine and effectively reducing the noise of the airflow flowing within a larger range of the wind duct 13.

[0065] Reference Figures 1-3 According to some embodiments of the present invention, the range of the first included angle α is 150° to 270°. For example, the first included angle α can be 150°, 180°, 210°, 240°, 270°, etc. By having the first included angle α not less than 150°, the length of the duct groove 131 extending along the circumference of the impeller can be longer, so as to effectively increase the airflow cross section in the duct 13 within a larger range of the impeller circumference, thereby effectively reducing the noise of the airflow flowing in the duct 13. By having the first included angle α not greater than 270°, for example, the fan volute 100 includes a volute tongue section 161, it can be avoided that the distance between one end of the circumference of the duct groove 131 and the volute tongue section 161 is too small, thus affecting the flow field of the volute tongue section 161.

[0066] By using the first included angle α in the range of 150° to 270°, the circumferential extension length of the wind tunnel groove 131 along the impeller and the influence of the wind tunnel groove 131 on the volute tongue section 161 can be better balanced. While effectively improving the airflow field in a large range along the impeller, the influence of the wind tunnel groove 131 on the flow field of the volute tongue section 161 can be reduced.

[0067] Reference Figures 1-4According to some embodiments of the present invention, the air duct 13 includes a communicating impeller cavity 132 and an air outlet channel 133. The impeller cavity 132 is used to accommodate an impeller, and the air outlet channel 133 is located radially outside the impeller cavity 132. The air outlet side of the air outlet channel 133 constitutes an airflow outlet 12. The impeller cavity 132 includes a first sidewall 1321 and a second sidewall 1322 disposed opposite to each other along the axial direction of the impeller. An airflow inlet 11 is formed on the first sidewall 1321, and an air duct groove 131 is located on the outer periphery of the airflow inlet 11, with at least a portion of the air duct groove 131 located within the impeller cavity 132. Wherein, at least a portion of the air duct groove 131 being located within the impeller cavity 132 includes the following situations: for example, a portion of the air duct groove 131 may be located within the impeller cavity 132; or, for another example, the entire air duct groove 131 may be located within the impeller cavity 132.

[0068] The impeller is housed in the impeller cavity 132, which makes the overall structure of the impeller and the fan casing 100 more compact. Since the air outlet channel 133 is located on the radial outer side of the impeller cavity 132 and the air outlet side of the air outlet channel 133 forms the airflow outlet 12, the airflow in the impeller cavity 132 can flow smoothly to the air outlet channel 133 and out through the airflow outlet 12.

[0069] The duct groove 131 is located on the outer periphery of the airflow inlet 11. When the airflow enters from the airflow inlet 11, the duct groove 131 can play a preliminary guiding role. Since the presence of the duct groove 131 changes the flow field near the airflow inlet 11, it can make the airflow flow into the impeller cavity 132 more smoothly, reducing or avoiding the possibility of turbulence at the airflow inlet 11. Furthermore, since at least a part of the duct groove 131 is located inside the impeller cavity 132, the duct groove 131 can continue to guide the airflow after it enters the impeller cavity 132. The duct groove 131 increases the flow cross section of at least a part of the impeller cavity 132, which can improve the flow field inside the impeller cavity 132 and reduce the noise generated when the airflow flows inside the impeller cavity 132.

[0070] For example, when the wind turbine rotates, the air duct groove 131 can guide the airflow to flow along the circumference of the wind turbine. By extending the air duct groove 131 along the circumference of the wind turbine, the flow cross section of the gas in the wind turbine cavity 132 can be increased over a larger range along the circumference of the wind turbine cavity 132. This helps to reduce the turbulence and pressure fluctuation of the airflow in the wind turbine cavity 132, and correspondingly, it can also reduce the noise generated when the airflow flows in the wind turbine cavity 132.

[0071] Reference Figures 1-3According to some embodiments of the present invention, at least a portion of the air duct groove 131 extends circumferentially along the airflow inlet 11. This extension of at least a portion of the air duct groove 131 along the circumferential direction of the airflow inlet 11 includes, for example, a portion of the air duct groove 131 extending circumferentially along the airflow inlet 11; or, for another example, the entire air duct groove 131 extending circumferentially along the airflow inlet 11.

[0072] By extending at least a portion of the air duct groove 131 circumferentially along the airflow inlet 11, the airflow can be guided in the initial stage of entering the air duct 13 through the airflow inlet 11, so that the airflow flows more smoothly into the impeller cavity 132 through the air duct groove 131, reducing the sudden change in airflow direction at the airflow inlet 11, and helping to reduce the possibility of turbulence in the airflow at the airflow inlet 11.

[0073] Reference Figures 1-3 According to some embodiments of the present invention, in the extending direction of the duct groove 131 and in the direction close to the air outlet channel 133, the width of the duct groove 131 in the radial direction of the impeller gradually increases, which can gradually increase the flow cross section of the airflow in the duct groove 131, reduce or avoid turbulence caused by abrupt changes in the flow cross section, thereby helping to reduce noise caused by turbulence; and, near the air outlet channel 133, the wider duct groove 131 can allow the airflow to diffuse over a larger area, avoiding the airflow from concentrating in the center or local area of ​​the air outlet channel 133, thereby achieving more uniform airflow.

[0074] Reference Figures 1-3 According to some embodiments of the present invention, in the extending direction of the air duct groove 131, the air duct groove 131 has a first end 1311 and a second end 1312, the first end 1311 being located within the impeller cavity 132 and the second end 1312 being located within the air outlet channel 133. The air duct groove 131 extends from the impeller cavity 132 to the air outlet channel 133, providing a continuous guiding path for airflow.

[0075] Within the impeller cavity 132, the duct groove 131 helps guide the airflow entering from the airflow inlet 11, ensuring a more orderly and smooth flow into the impeller cavity 132. Furthermore, the duct groove 131 formed on the inner wall of the duct 13 increases the gas volume within the impeller cavity 132. By increasing the cross-sectional area of ​​at least a portion of the airflow within the impeller cavity 132, the flow field within the impeller cavity 132 can be improved, thereby reducing noise generated when the airflow flows within the impeller cavity 132. When the airflow leaves the impeller cavity 132 and enters the outlet channel 133, the continuity of the duct groove 131 ensures a smooth transition of the airflow from the impeller cavity 132 to the outlet channel 133, reducing abrupt changes in airflow direction and velocity. This helps maintain airflow stability, avoids turbulence and eddies, and improves the smoothness and stability of the airflow throughout the duct 13.

[0076] Reference Figures 1-3 According to some embodiments of the present invention, the airflow inlet 11 is circular, and the air duct groove 131 includes a first groove segment 1313. The first groove segment 1313 is located on the outer periphery of the airflow inlet 11, and the extension trajectory of the first groove segment 1313 is an arc. By having the extension trajectory of the first groove segment 1313 be an arc, and by having the first groove segment 1313 be located on the outer periphery of the airflow inlet 11, the first groove segment 1313 can be adapted to the circular airflow inlet 11. When the airflow enters the air duct 13 through the airflow inlet 11, the flow direction can be gradually changed along the extension direction of the arc of the first groove segment 1313, avoiding sudden changes in airflow and turbulence, and allowing the airflow to enter the interior of the air duct 13 more smoothly.

[0077] Reference Figures 1-3 According to some embodiments of the present invention, a guide ring 3 is further included. The guide ring 3 is disposed on the outer surface of the first sidewall 1321 and surrounds the airflow inlet 11. The guide ring 3 surrounds the airflow inlet 11 and can guide the airflow about to enter the air duct 13 from the outside of the fan casing 100, so that the airflow flows more smoothly from the outside of the fan casing 100 into the air duct 13 through the airflow inlet 11. The air duct protrusion 2 is located on the outer periphery of the guide ring 3. The air duct protrusion 2 includes a first protrusion 21. The inner side of the first protrusion 21 forms a first groove segment 1313. The distance d between the first protrusion 21 and the guide ring 3 satisfies: 0mm≤d≤15mm. By the air duct protrusion 2 being located on the outer periphery of the guide ring 3 and protruding outward along the axial direction of the impeller, the guiding effect of the guide ring 3 on the airflow located outside the fan casing 100 and near the airflow inlet 11 can be enhanced.

[0078] For example, the distance d between the first convex 21 and the air guide ring 3 can be 0mm, 3mm, 6mm, 11mm, 15mm, etc. By ensuring that the distance d between the first convex 21 and the air guide ring 3 is not less than 0mm, a certain manufacturing error can be allowed between the first convex 21 and the air guide ring 3, which facilitates the processing and manufacturing of the air duct groove 131. By ensuring that the distance between the first convex 21 and the air guide ring 3 is not greater than 15mm, the first convex 21 can be as close as possible to the air guide ring 3, so as to effectively enhance the guiding effect of the airflow at the location of the air guide ring 3 outside the fan casing 100 and close to the airflow inlet 11, reduce or avoid the formation of vortices in the airflow before entering the airflow inlet 11, and make the airflow enter the airflow inlet 11 more smoothly from the outside of the fan casing 100, thereby helping to improve the operating efficiency of the impeller.

[0079] By ensuring that the distance d between the first convex 21 and the air guide ring 3 is 0mm≤d≤15mm, the distance between the first convex 21 and the air guide ring 3 can be made more reasonable, so as to effectively enhance the guiding effect of the air guide ring 3 on the airflow at the airflow inlet 11, and also allow for a certain manufacturing error between the first convex 21 and the air guide ring 3.

[0080] Reference Figures 1-3 According to some embodiments of the present invention, the air duct groove 131 includes a second groove section 1314, which is connected to one end of the first groove section 1313 near the air outlet channel 133. The second groove section 1314 extends from the impeller cavity 132 to the air outlet channel 133. The first groove section 1313 and the second groove section 1314 are connected and extend from the impeller cavity 132 to the air outlet channel 133. From the airflow inlet 11 to the air outlet channel 133, the first groove section 1313 and the second groove section 1314 provide a continuous guiding path for the airflow, so that the airflow entering through the airflow inlet 11 can flow more smoothly into the air outlet channel 133. Furthermore, the first groove section 1313 and the second groove section 1314 can effectively increase the flow cross section of the airflow in the impeller cavity 132 and effectively reduce the noise generated when the airflow flows in the impeller cavity 132.

[0081] Reference Figures 1-3 According to some embodiments of the present invention, the air outlet channel 133 includes a first air outlet wall 1331 and a second air outlet wall 1332 disposed opposite to each other. One end of the second air outlet wall 1332 adjacent to the impeller cavity 132 is connected to a volute tongue 134. The side wall of the second groove section 1314 near the second air outlet wall 1332 is a third side wall 1315. In the direction from the bottom wall of the second groove section 1314 to the opening of the second groove section 1314, the third side wall 1315 extends obliquely toward the direction near the airflow inlet 11 or the second air outlet wall 1332. In the direction from the bottom wall of the second groove section 1314 to the opening of the second groove section 1314, the third side wall 1315 extends obliquely toward the airflow inlet 11 or the second air outlet wall 1332. This allows a certain distance to exist between the third side wall 1315 and the volute tongue 134, thus preventing the distance between the second groove section 1314 and the volute tongue 134 from being too close and affecting the flow field at the volute tongue 134, reducing or avoiding the possibility of turbulence in the airflow at the volute tongue 134. Furthermore, the oblique extension of the third side wall 1315 allows the airflow cross-section to gradually decrease, reducing sudden changes in airflow direction or velocity caused by abrupt changes in the flow cross-section, thereby reducing the noise generated during airflow.

[0082] Reference Figures 1-3According to some embodiments of the present invention, the air duct profile of the volute body 1 includes a volute tongue segment 161, a first arc segment 162, a second arc segment 163, a third arc segment 164, and an outlet straight segment 165. The volute tongue segment 161, the first arc segment 162, the second arc segment 163, the third arc segment 164, and the outlet straight segment 165 extend circumferentially along the volute body 1 and are connected sequentially, providing a continuous guiding path for airflow. The first arc segment 162, the second arc segment 163, and the third arc segment 164 are concentrically arranged and their radii increase sequentially, so that the flow cross-section of the air duct 13 gradually increases, which helps to reduce the noise generated when the airflow flows in the air duct 13.

[0083] At least a portion of the duct groove 131 is formed in the third arc segment 164 and the outlet straight segment 165. The formation of at least a portion of the duct groove 131 in the third arc segment 164 and the outlet straight segment 165 may include the following situations: for example, a portion of the duct groove 131 may be formed in the third arc segment 164 and the outlet straight segment 165; or, for another example, the entire duct groove 131 may be formed in the third arc segment 164 and the outlet straight segment 165.

[0084] By forming at least a portion of the air duct groove 131 in the third arc segment 164 and the outlet straight segment 165, the flow cross section of the airflow in the third arc segment 164 and the outlet straight segment 165 can be further increased, thereby improving the flow field in the third arc segment 164 and the outlet straight segment 165 and helping to reduce the noise of the airflow in the third arc segment 164 and the outlet straight segment 165.

[0085] Reference Figures 1-3 According to some embodiments of the present invention, the design flow rate of the fan casing 100 is Q, the base circle radius of the casing body 1 is R2, and the center of the base circle of the casing body 1 is A, C 2u Let θ be the tangential velocity component of the finite blades under actual conditions, and θ be the polar coordinate angle variable of the base circle of the volute body 1, where θ∈[0,2π]. The wind duct groove 131 includes a fourth sidewall 1316 and a fifth sidewall 1317 arranged opposite to each other. The fifth sidewall 1317 is located on the side of the fourth sidewall 1316 away from the center A of the base circle of the volute body 1. The projection of the fifth sidewall 1317 onto the reference plane is the first projection, and the projection of the center A of the base circle of the volute body 1 onto the reference plane is the second projection. The reference plane is perpendicular to the axial direction of the wind turbine, and the distance R between the first projection and the second projection satisfies:

[0086] Because the airflow velocity and pressure distribution are different at different positions in the fan casing 100, the distance R between the first projection of the fifth sidewall 1317 on the reference plane and the second projection of the base circle center A of the casing body 1 on the reference plane satisfies... The flow section of the corresponding air duct groove 131 can be adjusted according to different positions of the fan casing 100 in the circumferential direction. This allows the extension trajectory of the air duct groove 131 along the circumferential direction of the fan casing 100 to be determined, thereby effectively improving the flow field in the air duct 13 and reducing the noise generated when the airflow flows in the air duct 13.

[0087] For example, in locations with higher pressure, the distance R between the first projection of the fifth sidewall 1317 on the reference plane and the second projection of the base circle center A of the volute body 1 on the reference plane can be increased to increase the airflow cross-section at that location, thereby effectively reducing the noise generated when the airflow flows in the duct 13.

[0088] The following reference Figures 1-4 A fan volute 100 according to some embodiments of the present invention is described.

[0089] Reference Figures 1-4 In this embodiment, the fan casing 100 includes a casing body 1 and an air guide ring 3. The casing body 1 has an airflow inlet 11, an airflow outlet 12 and an air duct 13. The air duct 13 connects the airflow inlet 11 and the airflow outlet 12. The air duct 13 is used to accommodate the fan wheel. The inner wall of the air duct 13 has an air duct groove 131. The air guide ring 3 is arranged around the airflow inlet 11.

[0090] The air duct profile of the volute body 1 includes a volute tongue segment 161, a first arc segment 162, a second arc segment 163, a third arc segment 164, and an outlet straight segment 165. The volute tongue segment 161, the first arc segment 162, the second arc segment 163, the third arc segment 164, and the outlet straight segment 165 extend circumferentially along the volute body 1 and are connected sequentially. The first arc segment 162, the second arc segment 163, and the third arc segment 164 are concentrically arranged and their radii increase sequentially. At least a portion of the air duct groove 131 is formed in the third arc segment 164 and the outlet straight segment 165.

[0091] A portion of the volute 100 protrudes outward along the axial direction of the impeller to form a duct protrusion 2, and a duct groove 131 is formed on the inner side of the duct protrusion 2. The depth of the duct groove 131 in the axial direction of the impeller is t, and the depth of the portion of the volute body 1 without the duct groove 131 in the axial direction of the impeller is w, where t and w satisfy w / 20≤t≤w / 8.

[0092] The portion of the volute body 1 that does not form the air duct protrusion 2 is the volute main body 14. The air duct protrusion 2 and the volute main body 14 are connected by a transition surface 15, which is a curved surface. In the direction from the air duct protrusion 2 to the volute body 1, the extension trajectory of the transition surface 15 is a transition curve, which satisfies a cubic Bézier curve.

[0093] At least a portion of the duct groove 131 extends along the circumference of the wind turbine. The lines connecting the two ends of the circumference of the duct groove 131 to the center of the wind turbine are the first line and the second line, respectively. The angle between the first line and the second line is the first angle α. The duct groove 131 is located within the range of the first angle α, which is greater than or equal to 90°.

[0094] The air duct 13 includes a connected impeller cavity 132 and an air outlet channel 133. The impeller cavity 132 is used to accommodate the impeller. The air outlet channel 133 is located on the radial outer side of the impeller cavity 132. The air outlet side of the air outlet channel 133 forms an airflow outlet 12. The impeller cavity 132 includes a first sidewall 1321 and a second sidewall 1322 arranged opposite to each other along the axial direction of the impeller. An airflow inlet 11 is formed on the first sidewall 1321. The air duct groove 131 is located on the outer periphery of the airflow inlet 11 and at least a portion of the air duct groove 131 is located inside the impeller cavity 132.

[0095] At least a portion of the air duct groove 131 extends circumferentially along the airflow inlet 11. In the extending direction of the air duct groove 131 and in the direction close to the air outlet channel 133, the width of the air duct groove 131 in the radial direction of the impeller gradually increases. In the extending direction of the air duct groove 131, the air duct groove 131 has a first end 1311 and a second end 1312, the first end 1311 being located within the impeller cavity 132, and the second end 1312 being located within the air outlet channel 133.

[0096] The airflow inlet 11 is circular, and the air duct groove 131 includes a first groove segment 1313. The first groove segment 1313 is located on the outer periphery of the airflow inlet 11 and the extension trajectory of the first groove segment 1313 is an arc.

[0097] The air guide ring 3 is disposed on the outer surface of the first side wall 1321 and surrounds the airflow inlet 11. The air duct protrusion 2 includes a first protrusion 21. The distance d between the first protrusion 21 and the air guide ring 3 satisfies: 0mm≤d≤15mm.

[0098] The air duct groove 131 includes a first groove section 1313 and a second groove section 1314. The first groove section 1313 is formed on the inner side of the first protrusion 21. The second groove section 1314 is connected to the end of the first groove section 1313 near the air outlet channel 133. The second groove section 1314 extends from the impeller cavity 132 into the air outlet channel 133.

[0099] The air outlet duct 133 includes a first air outlet wall 1331 and a second air outlet wall 1332 arranged opposite to each other. One end of the second air outlet wall 1332 adjacent to the impeller cavity 132 is connected to a volute tongue 134. The side wall of the second groove section 1314 near the second air outlet wall 1332 is a third side wall 1315. In the direction from the bottom wall of the second groove section 1314 to the opening of the second groove section 1314, the third side wall 1315 extends obliquely toward the direction of the airflow inlet 11 or the second air outlet wall 1332.

[0100] The design flow rate of the fan casing 100 is Q, the base circle radius of the casing body 1 is R2, and the center of the base circle of the casing body 1 is A, C. 2u Let θ be the tangential velocity component of the finite blades under actual conditions, and θ be the polar coordinate angle variable of the base circle of the volute body 1, where θ∈[0,2π]. The wind duct groove 131 includes a fourth sidewall 1316 and a fifth sidewall 1317 arranged opposite to each other. The fifth sidewall 1317 is located on the side of the fourth sidewall 1316 away from the center A of the base circle of the volute body 1. The projection of the fifth sidewall 1317 onto the reference plane is the first projection, and the projection of the center A of the base circle of the volute body 1 onto the reference plane is the second projection. The reference plane is perpendicular to the axial direction of the wind turbine, and the distance R between the first projection and the second projection satisfies:

[0101] The air duct groove 131 formed on the inner wall of the air duct 13 of the fan volute 100 can increase the flow area of ​​the airflow in the air duct 13, improve the flow field in the air duct 13, and make the airflow in the air duct 13 smoother, thereby effectively reducing the noise of the airflow in the air duct 13.

[0102] Reference Figures 1-3 An air conditioner according to a second aspect embodiment of the present invention includes a housing assembly, a fan assembly, and a heat exchanger assembly. The housing assembly has an air inlet and an air outlet. The fan assembly includes a fan impeller and a fan volute 100 according to the first aspect embodiment of the present invention. The fan impeller is disposed within an air duct 13. The heat exchanger assembly is disposed within the housing assembly and is located between the fan volute 100 and the air inlet. For example, the fan impeller can be a centrifugal fan impeller.

[0103] When the air conditioner is working, the fan drives the airflow into the casing assembly through the air inlet and flows to the heat exchanger assembly. After heat exchange by the heat exchanger assembly, the airflow can flow into the air duct 13 through the air inlet 11. The airflow flowing into the air duct 13 flows along the circumference of the fan towards the air outlet 133, and then flows from the air outlet 133 to the air outlet 12. The airflow flowing out from the air outlet 12 flows to the air outlet and then flows out to the room to cool / heat the room.

[0104] According to an embodiment of the present invention, the air conditioner includes the aforementioned fan volute 100. The inner wall of the air duct 13 of the fan volute 100 is formed with an air duct groove 131, which can increase the flow area of ​​the airflow in the air duct 13, improve the flow field in the air duct 13, and make the airflow in the air duct 13 smoother, thereby effectively reducing the noise of the airflow in the air duct 13.

[0105] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0106] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0107] In the description of this invention, "a plurality of" means two or more.

[0108] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0109] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0110] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0111] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A fan casing, characterized in that, The wind turbine casing includes a casing body, which has an airflow inlet, an airflow outlet, and an air duct. The air duct connects the airflow inlet and the airflow outlet, and is used to accommodate the wind turbine. The inner wall of the air duct has an air duct groove.

2. The fan casing according to claim 1, characterized in that, A portion of the fan casing protrudes outward to form a duct bulge, and the duct groove is formed on the inner side of the duct bulge.

3. The fan casing according to claim 2, characterized in that, A portion of the wind turbine volute protrudes outward along the axial direction of the wind turbine to form the duct bulge.

4. The fan casing according to claim 3, characterized in that, The depth of the air duct groove in the axial direction of the impeller is t, and the depth of the portion of the volute body that does not form the air duct groove in the axial direction of the impeller is w, where t and w satisfy: w / 20≤t≤w / 8.

5. The fan casing according to claim 4, characterized in that, t and w further satisfy: w / 16≤t≤w / 12.

6. The fan casing according to claim 2, characterized in that, The portion of the volute body that does not form the air duct protrusion is the volute body portion. The air duct protrusion and the volute body portion are connected by a transition surface, which is a curved surface.

7. The fan casing according to claim 6, characterized in that, In the direction from the duct bulge to the volute body, the extension trajectory of the transition surface is a transition curve, which satisfies a cubic Bézier curve.

8. The fan casing according to claim 2, characterized in that, At least a portion of the duct groove extends circumferentially along the impeller.

9. The fan casing according to claim 8, characterized in that, The lines connecting the two circumferential ends of the duct groove to the center of the impeller are the first line and the second line, respectively. The angle between the first line and the second line is the first angle. The duct groove is located within the range of the first angle, and the first angle is greater than or equal to 90°.

10. The fan casing according to claim 9, characterized in that, The first included angle ranges from 150° to 270°.

11. The fan casing according to claim 2, characterized in that, The air duct includes a connected impeller cavity and an air outlet channel. The impeller cavity is used to accommodate the impeller. The air outlet channel is located radially outside the impeller cavity. The air outlet side of the air outlet channel constitutes the airflow outlet. The impeller cavity includes a first sidewall and a second sidewall that are arranged opposite to each other along the axial direction of the impeller. The airflow inlet is formed in the first sidewall. The air duct groove is located on the outer periphery of the airflow inlet and at least a portion of the air duct groove is located inside the impeller cavity.

12. The fan casing according to claim 11, characterized in that, At least a portion of the air duct groove extends circumferentially along the airflow inlet.

13. The fan casing according to claim 12, characterized in that, In the extending direction of the duct groove and in the direction close to the air outlet channel, the width of the duct groove in the radial direction of the impeller gradually increases.

14. The fan casing according to claim 12, characterized in that, In the extending direction of the air duct groove, the air duct groove has a first end and a second end, the first end being located inside the impeller cavity and the second end being located inside the air outlet channel.

15. The fan casing according to claim 12, characterized in that, The airflow inlet is circular, and the air duct groove includes a first groove segment, which is located on the outer periphery of the airflow inlet and the extension trajectory of the first groove segment is an arc.

16. The fan casing according to claim 15, characterized in that, It also includes an air guide ring, which is disposed on the outer surface of the first sidewall and surrounds the airflow inlet; The air duct protrusion is located on the outer periphery of the air guide ring. The air duct protrusion includes a first protrusion, and the first groove segment is formed on the inner side of the first protrusion. The distance d between the first protrusion and the air guide ring satisfies: 0mm≤d≤15mm.

17. The fan casing according to claim 15, characterized in that, The air duct groove includes a second groove section, which is connected to one end of the first groove section near the air outlet channel. The second groove section extends from inside the impeller cavity into the air outlet channel.

18. The fan casing according to claim 17, characterized in that, The air outlet channel includes a first air outlet wall and a second air outlet wall arranged opposite to each other. A volute tongue is connected to one end of the second air outlet wall adjacent to the impeller cavity. The side wall of the second groove section near the second air outlet wall is a third side wall. In the direction from the bottom wall of the second groove section to the opening of the second groove section, the third side wall extends obliquely toward the direction close to the airflow inlet or the second air outlet wall.

19. The fan casing according to any one of claims 1-18, characterized in that, The air duct profile of the volute body includes a volute tongue segment, a first arc segment, a second arc segment, a third arc segment, and an outlet straight segment. The volute tongue segment, the first arc segment, the second arc segment, the third arc segment, and the outlet straight segment extend circumferentially along the volute body and are connected sequentially. The first arc segment, the second arc segment, and the third arc segment are concentrically arranged and their radii increase sequentially. At least a portion of the air duct groove is formed in the third arc segment and the outlet straight segment.

20. The fan casing according to any one of claims 1-18, characterized in that, The design flow rate of the fan casing is Q, the base circle radius of the casing body is R2, and the center of the base circle of the casing body is A, C. 2u The tangential velocity component of the blades is given in actual conditions. θ is the polar coordinate angle variable of the base circle of the volute body, and θ∈[0,2π]. The air duct groove includes a fourth sidewall and a fifth sidewall arranged opposite to each other. The fifth sidewall is located on the side of the fourth sidewall away from the center A of the base circle of the volute body. The projection of the fifth sidewall onto the reference plane is the first projection, and the projection of the center A of the base circle of the volute body onto the reference plane is the second projection. The reference plane is perpendicular to the axial direction of the wind turbine, and the distance R between the first projection and the second projection satisfies:

21. An air conditioner, characterized in that, include: A housing assembly having an air inlet and an air outlet formed thereon; A wind turbine assembly, comprising a wind turbine rotor and a wind turbine casing according to any one of claims 1-20, wherein the wind turbine rotor is disposed within the wind duct; A heat exchanger assembly, which is disposed within the housing assembly and located between the fan volute and the air inlet.

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