Impeller, fan and air conditioner

Abstract

The utility model relates to the technical field of household appliances, in particular to an impeller, a fan and an air conditioner, the impeller comprises a hub and blades, the multiple blades are evenly arranged around the hub in the circumferential direction, the two ends of each blade in the axial direction of the hub are the first end and the second end respectively, the first end is located at an air inlet of the fan, and the second end is connected with the hub. The width of the blade at the first end is smaller than that of the blade at the second end, and the width of the blade is the width of the blade in the airflow direction. Air flow outlet is smoother, vortex formed in the fan is reduced, vortex noise is reduced, the air volume is increased, noise is lower, comfort is improved, work applied to the air flow is increased, and therefore the efficiency of the fan is improved, power is reduced, energy consumption is reduced, and energy is saved.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, and in particular to an impeller, a fan and an air conditioner. Background Technology

[0002] Existing fresh air conditioning products can provide fresh air function by introducing outdoor air into the room through a fresh air fan. However, the existing air conditioning fans are all ordinary centrifugal fans, and the impeller blades of the fans are basically straight structures parallel to the fan axis. They are not suitable for the complex flow field of fresh air in air conditioning, resulting in low airflow efficiency, chaotic airflow inside the fan, and relatively high noise. Consequently, they have high energy consumption and high power consumption. Utility Model Content

[0003] This utility model provides an impeller, a fan, and an air conditioner to solve one of the defects in the prior art. The airflow is smoother, the formation of vortices inside the fan is reduced, thereby reducing vortex noise, increasing air volume, lowering noise, improving comfort, increasing the work done on the airflow, thereby improving fan efficiency, reducing power, reducing energy consumption, and saving energy.

[0004] This utility model provides an impeller, comprising:

[0005] Wheel hub;

[0006] The blades are arranged circumferentially around the hub. Each blade has a first end and a second end at its two ends along the axial direction of the hub. The first end is located at the air inlet of the fan, and the second end is connected to the hub. The width of the blade at the first end is smaller than the width at the second end. The width of the blade is the width of the blade along the airflow direction.

[0007] According to the present invention, the width of the blades gradually increases from the first end to the second end.

[0008] According to the present invention, each blade has a first edge and a second edge along the airflow direction. The first edge gradually bends away from the second edge from the first end to the second end to form an arc-shaped edge.

[0009] According to the present invention, the straight-line distance between the two ends of the first edge is between 66mm and 70mm, and the straight-line distance between the projections of the two ends of the first edge onto the plane where the second end is located is between 4mm and 7mm.

[0010] According to the present invention, the relative bending angles of the two ends of the first edge are between 3° and 6°.

[0011] According to the present invention, the impeller has a vertical distance between the hub axis and the first edge that is between 81 mm and 87 mm.

[0012] According to the present invention, the impeller blades are arc-shaped blades with an arcuate angle between 80° and 84°.

[0013] This utility model also provides a fan, comprising:

[0014] A volute, wherein the volute is provided with an inner cavity and an air inlet communicating with the inner cavity;

[0015] As described above, the impeller is disposed in the inner cavity, and the first end is located at the air inlet.

[0016] According to the present invention, a fan is provided, the volute comprising:

[0017] The first shell portion has a cross-sectional shape that is an arc-shaped structure that bulges outward along the radial direction of the volute in the middle. The first shell portion is provided with the inner cavity and forms the air inlet.

[0018] The second shell portion forms a volute tongue at the connection between the second shell portion and the first shell portion, and the second shell portion forms an air outlet.

[0019] This utility model also provides an air conditioner, including the fan described above.

[0020] The impeller of this embodiment is suitable for a forward-inclined multi-blade centrifugal fan. Multiple blades are arranged around a hub, evenly distributed circumferentially around the hub. The axial direction of the hub is the width direction of the impeller. All blades are concentrated on one side of the hub, and the length of each blade extends in the axial direction of the hub. The two ends along the length of the blade are a first end and a second end, respectively. The second end is connected to the hub surface, and the first end is connected to a fixing ring, thus forming a complete impeller. When the fan draws air in, the airflow enters the fan through the inlet, flows through the blades to the outlet, and is discharged from the outlet. The airflow direction on the blades is the width direction of the blades.

[0021] The first end of the blade is located at the air inlet of the fan, and the second end of the blade is located inside the fan. The width of the first end is smaller than the width of the second end. At the air inlet, the airflow is relatively low, and the narrower width of the first end of the blade at this location allows the airflow to pass through the blade more quickly and enter the air outlet, resulting in smoother airflow and reducing the formation of vortices inside the fan. This reduces vortex noise, increases airflow, lowers noise, and improves comfort. Inside the fan, where the airflow is relatively high, the wider width of the second end of the blade increases the time it takes for the airflow to pass through the blade and enter the air outlet, increasing the work done on the airflow. This improves fan efficiency, reduces power consumption, lowers energy consumption, and saves energy. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the worm gear structure provided in an embodiment of the present invention;

[0024] Figure 2 This is a front view of the worm gear provided in an embodiment of this utility model;

[0025] Figure 3 yes Figure 2 KK sectional view;

[0026] Figure 4 This is a schematic diagram of the structure of the fan provided in an embodiment of the present utility model;

[0027] Figure 5 This is a front view of the volute provided in an embodiment of the present invention;

[0028] Figure 6 yes Figure 5 FF sectional view;

[0029] Figure 7 This is a bottom view of the volute provided in an embodiment of this utility model.

[0030] Figure label:

[0031] 100. Shell; 110. Air outlet; 120. Inner cavity; 130. Volute tongue; 160. Air inlet; 131. Middle section; 132. First end; 133. Second end; 140. First shell section; 141. Outer contour line; 150. Second shell section;

[0032] 200, Impeller; 210, Hub; 220, Blade; 221, First end; 222, Second end; 223, First edge; 224, Second edge; 230, Fixing ring. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0034] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model 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 the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0036] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0038] like Figures 1 to 4 As shown, this embodiment of the utility model provides an impeller, including a hub 210 and blades 220. Multiple blades 220 are evenly arranged around the hub 210. Each blade 220 has a first end 221 and a second end 222 at its two ends along the axial direction of the hub 210. The first end 221 is located at the air inlet 160 of the fan, and the second end 222 is connected to the hub 210. The width of the blade 220 at the first end 221 is smaller than the width at the second end 222. The width of the blade 220 is the width of the blade 220 along the upward direction of the airflow.

[0039] The impeller of this embodiment is suitable for a forward-inclined multi-blade centrifugal fan. Multiple blades 220 surround a hub 210 and are evenly distributed circumferentially around the hub 210. The axial direction of the hub 210 is the width direction of the impeller. All blades 220 are concentrated on one side of the hub 210. The length extension direction of each blade 220 is the axial direction of the hub 210. The two ends of the blade 220 in the length direction are a first end 221 and a second end 222, respectively. The second end 222 is connected to the surface of the hub 210, and the first end 221 is connected to a fixing ring 230, thus forming an integral impeller. When the fan draws air in, the airflow enters the fan through the inlet 160, then flows through the blades 220 to the outlet 110, and is discharged from the outlet 110. The airflow direction on the blades 220 is the width direction of the blades 220.

[0040] The first end 221 of the blade 220 is located at the air inlet 160 of the fan, and the second end 222 of the blade 220 is located inside the fan. The width of the first end 221 is smaller than the width of the second end 222. When there is less airflow at the air inlet 160, the narrower width of the first end 221 of the blade 220 at this location allows the airflow at the air inlet 160 to pass through the blade 220 more quickly and enter the air outlet 110, making the airflow smoother, reducing the formation of vortices inside the fan, thereby reducing vortex noise, increasing air volume, lowering noise, and improving comfort. When there is more airflow inside the fan, the wider width of the second end 222 of the blade 220 at this location increases the time for the airflow to pass through the blade 220 and enter the air outlet 110, increasing the work done on the airflow, thereby improving fan efficiency, reducing power consumption, reducing energy consumption, and saving energy.

[0041] According to one embodiment of this utility model, the width of the blade 220 gradually increases from the first end 221 to the second end 222. In this embodiment, the width of the blade 220 is gradually increased, that is, it gradually increases from the first end 221 to the second end 222 along the length direction of the blade 220. The gradual increase can be a uniform increment or a non-uniform increment. This results in different blade 220 shapes, thereby adapting to different types and air volume requirements of fan applications.

[0042] According to one embodiment of the present invention, the edges of each blade 220 along the airflow direction are sequentially designated as a first edge 223 and a second edge 224. The first edge 223 gradually curves away from the second edge 224 from the first end 221 to the second end 222, forming an arc-shaped edge. In this embodiment, the two sides of the blade 220 in the width direction are the first edge 223 and the second edge 224, respectively. When the airflow passes through the blade 220, it flows from the first edge 223 to the second edge 224. Thus, the second edges 224 of all blades 220 form the outer peripheral side of the impeller, and the first edges 223 of all blades 220 form the inner peripheral side of the impeller. The two ends of the first edge 223 and the second edge 224 are connected to form the first end 221 and the second end 222. The width of the blade 220 is the distance from the first edge 223 to the second edge 224.

[0043] The first edge 223 extends in a curved form along the length of the blade 220, curving away from the first end 221 to the second end 222 in a direction away from the second edge 224 to form an arc-shaped edge, thereby creating a structure in which the width of the blade 220 gradually increases from the first end 221 to the second end 222.

[0044] In this embodiment, the first edge 223 is an arc-shaped edge, that is, an arc-shaped edge formed by a gradual and inconsistent increment. In other embodiments, the first edge 223 may also be an inclined straight edge.

[0045] According to one embodiment of this utility model, the straight-line distance between the two ends of the first edge 223 is between 66mm and 70mm, and the straight-line distance between the projections of the two ends of the first edge 223 onto the plane where the second end 222 is located is between 4mm and 7mm. In this embodiment, limiting the straight-line distance between the two ends of the first edge 223 to 66mm to 70mm can limit the bending or tilting range of the first edge 223. The plane where the second end 222 is located is the surface of the hub 210 facing the air inlet 160. Limiting the projection straight-line distance between the two ends of the first edge 223 onto this plane to 4mm to 7mm can also limit the bending or tilting range of the first edge 223, thereby limiting the shape of the blade 220 and adapting it to the fan's requirements for air volume, efficiency, and noise.

[0046] According to one embodiment of the present invention, the relative bending angles of the two ends of the first edge 223 are between 3° and 6°. In this embodiment, the angle formed between the projection of the first edge 223 onto the plane where the second end 222 is located and the three points of the first edge 223 located at the end of the air inlet 160 is the relative bending angle of the two ends of the first edge 223. This bending angle is limited to 3° to 6°, which limits the bending or tilting angle of the first edge 223.

[0047] According to one embodiment of the present invention, the vertical distance between the axis of the hub 210 and the first edge 223 is between 81mm and 87mm. In this embodiment, the minimum vertical distance between the center of the hub 210 and the first edge 223 is limited to 81mm to 82mm, and the maximum vertical distance is limited to 86mm to 87mm. This limits the specific position of the blades 220 distributed around the hub 210, thereby limiting the size of the space inside the impeller to meet the requirements of the type of fan.

[0048] According to one embodiment of the present invention, the blade 220 is an arc-shaped blade 220, and the curvature of the blade 220 is between 80° and 84°. In this embodiment, the blade 220 itself is an arc-shaped blade 220, that is, the blade 220 has a curved arc structure, and the cross-sectional shape of the blade 220 perpendicular to the length direction is arc-shaped. The width of the blade 220 is the chord length of the arc-shaped blade 220. The chord length from the first end 221 to the second end 222 gradually increases, and the work done on the airflow also gradually increases.

[0049] like Figures 4 to 7 As shown, the volute provided in this embodiment of the utility model includes a housing 100. The housing 100 is provided with an air outlet 110, an inner cavity 120 and a volute tongue 130. The volute tongue 130 is located at the communication position between the air outlet 110 and the inner cavity 120. The volute tongue 130 is an arc-shaped structure with the middle part bent and protruding towards the air outlet 110 in the air outlet direction.

[0050] In this embodiment of the utility model, the shell 100 surrounds an inner cavity 120 and an air outlet 110. The inner cavity 120 and the air outlet 110 are connected, and a volute tongue 130 is formed at the connection point of the shell 100. The volute tongue 130 has an arc-shaped structure, and the middle part of the arc-shaped volute tongue 130 is a curved shape that protrudes towards the air outlet 110 in the direction of airflow. An impeller 200 is installed in the inner cavity 120 of the housing 100 to form a fan. The rotation of the impeller 200 draws external air into the inner cavity 120. When the airflow in the inner cavity 120 enters the air outlet 110, it passes through the volute tongue 130. The arc-shaped design of the volute tongue 130 makes the middle part of the volute tongue 130 higher than the two ends. That is, the outer edge of the blade of the impeller 200 and the volute tongue 130 form an unequal distance fit structure. The airflow in the inner cavity 120 will first contact the two ends of the volute tongue 130 and enter the air outlet 110, and then contact the middle part of the volute tongue 130 and enter the air outlet 110. Therefore, during the periodic impact of the airflow on the volute tongue 130, the distance of the airflow impacting the volute tongue 130 changes. The airflow flowing from the same blade edge can impact the volute tongue 130 at different times, so the noise generated by the impact cannot be superimposed, thereby reducing the fan noise and making the fan's exhaust sound softer.

[0051] Furthermore, the upward convexity of the middle part of the volute tongue 130 is equivalent to drawing the impeller 200 into the airflow in the inner cavity 120, increasing the working distance of the airflow concentrated in the middle range, thereby increasing the pressure in the inner cavity 120 to facilitate the fan's air intake. At the same time, the arc-shaped upward convex curved structure in the middle of the volute tongue 130 can expand the flow space of the middle airflow from the inner cavity 120 into the air outlet 110, reduce the flow resistance, and further increase the air volume of the middle airflow into the air outlet 110, thereby improving the fan's air output efficiency.

[0052] According to one embodiment of the present invention, the volute tongue 130 includes a middle part 131 and two ends. The middle part 131 bends and protrudes in the direction of air outlet 110. The two ends are respectively connected to the two ends of the middle part 131 and are arranged opposite to each other. At least one end gradually bends and protrudes in the inner cavity 120 along the direction of air outlet 110.

[0053] In this embodiment, the volute tongue 130 is composed of a middle part 131 and two ends. The overall volute tongue 130 is a curved strip. The middle part 131 is a curved arc shape that curves upward towards the air outlet 110. The two ends are respectively connected to the two ends of the arc-shaped middle part 131. The two ends can be a first end 132 and a second end 133 arranged opposite to each other. Both the first end 132 and the second end 133 extend from the junction of the air outlet 110 and the cavity along the air outlet 110 and connect to the arc-shaped middle part 131. At least one of the first end 132 and the second end 133 gradually bends and protrudes towards the inner cavity 120 during the extension process, thereby forming a strip-shaped protrusion along the axial direction of the volute shell at the junction of the inner cavity 120 and the air outlet 110.

[0054] Since the end is located on the side of the volute tongue 130, the design of the end protruding into the inner cavity 120 allows the airflow in the side range of the airflow discharged from the inner cavity 120 to turn into the air outlet 110 earlier than the airflow concentrated in the middle range. The end guides the airflow on the side, so that it can be separated from the inner cavity 120 and enter the air outlet 110 in advance. The airflow on the side is smaller, thereby reducing the fan power and reducing energy consumption.

[0055] According to one embodiment of the present invention, the two ends are symmetrically arranged. In this embodiment, both the first end 132 and the second end 133 gradually bend and protrude into the inner cavity 120 during the extension process, thereby forming a strip-shaped protrusion along the axial direction of the volute protruding into the inner cavity 120 at the junction of the inner cavity 120 and the air outlet 110. The extension and bending forms of the first end 132 and the second end 133 are consistent, and they are symmetrically distributed.

[0056] The first end 132 and the second end 133 are symmetrically arranged on both sides of the arc-shaped middle part 131, thereby forming a symmetrical structure of the volute tongue 130. This allows the airflow in the two side ranges of the airflow discharged from the inner cavity 120 to turn into the air outlet 110 earlier than the airflow concentrated in the middle range. The two ends guide the airflow on the two sides, further improving the airflow separation effect, reducing the fan power, and reducing energy consumption.

[0057] According to one embodiment of the present invention, the distribution angle α of the middle portion 131 in the circumferential direction of the housing 100 is between 20° and 25°. In this embodiment, the housing 100 is cylindrical in shape, and the distribution angle α of the middle portion 131 of the volute tongue 130 is the length range of the middle portion 131. The volute tongue 130 is formed within the circumferential side of the volute shell. By limiting the distribution angle α of the middle portion 131 in the 360° circumferential direction of the housing 100 to 20° to 25°, that is, the length distribution of the middle portion 131 covers 20° to 25° of the circumference, it can ensure the enclosure and shaping of the inner cavity 120 and the air outlet 110, and also ensure the flow area of ​​the airflow between the inner cavity 120 and the air outlet 110, thus ensuring the normal pressure of the fan.

[0058] According to one embodiment of the present invention, the vertical distance A between the two ends of the middle portion 131 is between 70mm and 76mm. In this embodiment, the vertical distance A between the two ends of the middle portion 131 of the volute tongue 130 is the maximum width range of the middle portion 131. The width direction of the middle portion 131 is parallel to the axial direction of the volute shell. Therefore, the maximum width range of the middle portion 131 is limited to 70mm to 76mm, ensuring the width of the communication area between the inner cavity 120 of the volute shell and the air outlet 110.

[0059] According to one embodiment of the present invention, the distribution angle b of the end portion in the circumferential direction of the housing 100 is between 35° and 40°. In this embodiment, the housing 100 is cylindrical in shape, and the distribution angle b of the end portion of the volute tongue 130 is the length range of the end portion. The volute tongue 130 is formed within the circumferential side surface of the volute shell. By limiting the distribution angle b of the end portion in the 360° circumferential direction of the housing 100 to 35° to 40°, that is, the length distribution of the end portion covers 35° to 40° of the circumference, it can ensure the enclosure and forming of the inner cavity 120 and the air outlet 110, and also ensure the flow area of ​​the airflow between the inner cavity 120 and the air outlet 110, thus ensuring normal fan pressure.

[0060] In this embodiment, the sum of the length distribution ranges of the middle portion 131 and the end portion of the volute tongue 130 is the length distribution range of the volute tongue 130. Through optimization analysis and internal wind speed and pressure analysis, the distribution angle of the volute tongue 130 is limited to between 55° and 65°. In other embodiments, the distribution angle of the volute tongue 130 can be adjusted according to actual needs, and the corresponding distribution angles of the middle portion 131 and the end portion of the volute tongue 130 can also be adjusted.

[0061] According to one embodiment of this utility model, the vertical distance between the two ends gradually decreases along the air outlet direction, with the maximum vertical distance B between 88mm and 79mm. In this embodiment, the width of the volute tongue 130 at its end position gradually decreases along the air outlet direction, limiting the maximum vertical distance B to 88mm to 79mm. The distance between the two ends gradually decreases to the vertical distance between the two ends of the middle part 131, that is, from 88mm to 79mm to 70mm to 76mm. The gradually narrowing width of the volute tongue 130 makes the area connecting the inner cavity 120 and the air outlet 110 also form a correspondingly narrowing area, stabilizing the air outlet and improving the airflow discharge efficiency in the middle of the fan.

[0062] like Figures 1 to 4 As shown, the volute provided in this embodiment of the present invention includes a first shell portion 140 and a second shell portion 150. The cross-sectional shape of the first shell portion 140 is an arc-shaped structure that bulges outward along the radial direction of the first shell portion 140 in the middle. The interior of the first shell portion 140 is provided with an inner cavity 120. The connection between the second shell portion 150 and the first shell portion 140 forms a volute tongue 130, and the second shell portion 150 forms an air outlet 110.

[0063] The volute casing of this utility model embodiment comprises a first shell portion 140 and a second shell portion 150. The first shell portion 140 surrounds an inner cavity 120, and the second shell portion 150 surrounds an air outlet 110. The first shell portion 140 and the second shell portion 150 are connected to communicate with the inner cavity 120 and the air outlet 110, and a volute tongue 130 is formed at the connection between the first shell portion 140 and the second shell portion 150. The first shell portion 140 is cylindrical in shape, and its cross-section is a plane that is coplanar with the axial direction of the first shell portion 140. Any cross-sectional shape of the first shell portion 140 is an arc-shaped structure that bulges outward along the radial direction of the first shell portion 140, that is, the first shell portion 140 is a structure that bulges outward at the middle part in its axial direction.

[0064] An impeller 200 is disposed in the inner cavity 120 of the first housing 140. The impeller 200 rotates to draw external air into the inner cavity 120. The first housing 140 is equivalent to surrounding the outer edge of the blade of the impeller 200. The design of the first housing 140 is such that the middle part of the first housing 140 is higher than the two ends. That is, the outer edge of the blade of the impeller 200 and the first housing 140 form an unequal distance fit structure, that is, the middle position of the outer edge of the blade corresponds to the middle part of the first housing 140 with a larger distance, and the two ends of the outer edge of the blade correspond to the two ends of the first housing 140 with a smaller distance. That is, along the axial direction of the first housing 140, the distance between the outer edge of the blade and the inner surface of the first housing 140 is a gradual fit that gradually increases and then decreases.

[0065] Because the airflow is low on both sides of the impeller 200 and high in the middle, which is equivalent to low airflow at both ends of the outer edge of the blade and high airflow in the middle of the outer edge of the blade, the design of the first housing 140 allows the airflow to converge and flow from the side of the first housing 140 to the middle when the impeller 200 rotates and draws air. This avoids turbulence caused by the equidistant distance between the volute and the outer edge of the blade. The reasonable distance adjustment based on the airflow distribution reduces the degree of airflow disorder in the first housing 140, balances the airflow pressure distribution in the first housing 140, thereby reducing fan noise and making the fan's exhaust sound softer and more comfortable.

[0066] Moreover, the arc-shaped cross-section of the first housing 140 allows the airflow on both sides to be concentrated towards the center, which can further increase the suction effect of the impeller 200, as well as increase the air volume entering the inner cavity 120 of the first housing 140 and the air volume at the outlet, increase the outlet pressure, thereby reducing the fan energy consumption, improving the outlet efficiency, and saving energy.

[0067] According to one embodiment of the present invention, the arc-shaped cross-sectional structure of the first shell portion 140 is a symmetrical structure. In this embodiment, the arc-shaped cross-sectional shape of the first shell portion 140 is a circular arc design with a convex center and concave ends, forming an overall symmetrical structure. This can further improve the airflow concentration effect within the first volute, adjust and balance the pressure distribution, and facilitate the processing and manufacturing of the first shell portion 140.

[0068] In other implementations, the arc-shaped cross-section of the first shell 140 can also be an asymmetrical structure, and the shape of the arc-shaped cross-section can be designed according to the actual wind turbine requirements.

[0069] According to one embodiment of the present invention, the outer contour line 141 of the first shell portion 140 is a spiral line with a gradually increasing spiral radius. In this embodiment, after the first shell portion 140 is projected onto a plane perpendicular to its axial direction, the innermost contour line is the inner contour line of the first shell portion 140, and the outermost contour line is the outer contour line 141 of the first shell portion 140. The inner contour line can be circular, and the outer contour line 141 can be a spiral line. According to the air intake and exhaust requirements of the fan, the outer contour line 141 is designed as a spiral line with a gradually increasing spiral radius along the spiral direction from the inside to the outside.

[0070] Since the outer contour line 141 of the first shell portion 140 is a spiral with a gradually increasing spiral radius, the inner contour line and the outer contour line 141 coincide at the starting end of the spiral, and the inner contour line and the outer contour line 141 are separated by a certain distance at the ending end of the spiral. The second shell portion 150 is disposed at the spiral ending end of the first shell portion 140, and the second shell portion 150 closes and connects the spiral ending end and the spiral starting end, and a volute tongue 130 is formed at the connection between the spiral starting end and the second shell portion 150.

[0071] According to one embodiment of the present invention, the central angle of the cross-section of the first shell portion 140 gradually increases from the inside to the outside along the spiral direction of the outer contour line 141 of the first shell portion 140. In this embodiment, the central angle of the arc-shaped cross-section of the first shell portion 140 gradually increases from the spiral starting end to the spiral ending end of the outer contour line 141, that is, the curvature of the cross-section of the first shell portion 140 gradually increases. With a fixed width of the first shell portion 140 along its axial direction, the gradual change in the curvature of the arc-shaped cross-section achieves the effect of gradually increasing the space of the inner cavity 120, thereby further improving the air intake and air output of the fan while ensuring that the fan pressure requirements are met.

[0072] According to one embodiment of the present invention, the maximum central angle d of the cross-section of the first shell portion 140 is between 185° and 190°. In this embodiment, the cross-section of the first shell portion 140 at the spiral termination end of the outer contour line 141 has the maximum central angle d. To ensure that the fan pressure requirements are met, and to maximize the fan's suction and discharge volumes, the maximum central angle d is limited to 185° to 190°.

[0073] According to one embodiment of the present invention, the minimum radius D of the cross-section of the first shell portion 140 is between 44 mm and 46 mm. In this embodiment, since the width of the first shell portion 140 along its axial direction is limited, the minimum radius D of the arc-shaped cross-section of the first shell portion 140 is also located at the spiral termination end of the outer contour line 141. Under the premise of satisfying the size of the central angle of the cross-section at this location, the minimum radius D is limited to 44 mm to 46 mm in order to maximize the suction and discharge volume of the fan.

[0074] According to one embodiment of the present invention, the helical angle c of the outer contour line 141 of the first shell portion 140 is between 315° and 325°. In this embodiment, to ensure the overall shape and structure of the volute, the helical angle c of the outer contour line 141 of the first shell portion 140 is limited to 315° to 325°, so that the first shell portion 140 has sufficient internal cavity 120 space to cooperate with the impeller 200 for air suction and pressure storage, and also has sufficient space and angle to ensure the length and extension direction of the second shell portion 150, thereby meeting the air outlet requirements of the fan.

[0075] According to one embodiment of the present invention, the minimum helical radius e of the outer contour line 141 of the first shell portion 140 is between 110 mm and 120 mm, and the maximum helical radius E of the outer contour line 141 of the first shell portion 140 is between 160 mm and 170 mm. In this embodiment, the first shell portion 140 has a minimum helical radius e at the helical starting end of the outer contour line 141 and a large helical radius E at the helical ending end of the outer contour line 141. To ensure the overall size of the fan, the minimum helical radius e is limited to 110 mm to 120 mm, and the maximum helical radius E is limited to 160 mm to 170 mm.

[0076] The fan provided by this utility model is described below. The fan described below and the volute described above can be referred to in correspondence.

[0077] This utility model embodiment also provides a fan, including an impeller 200 and a volute as described in the above embodiment, wherein the impeller 200 is disposed in the inner cavity 120 of the volute.

[0078] The air conditioner provided by this utility model is described below. The air conditioner described below can be referred to in correspondence with the fan described above.

[0079] This utility model embodiment also provides an air conditioner, including the fan as described in the above embodiment.

[0080] This utility model relates to a fresh air technology integrated into an air conditioner, which uses a high-pressure centrifugal fan for fresh air in air conditioners to introduce outdoor air into the room through a fresh air duct.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An impeller, characterized by, The fan comprises: a hub (210); a plurality of blades (220) circumferentially and uniformly arranged around the hub (210), each of the blades (220) has a first end (221) and a second end (222) in the axial direction of the hub (210), the first end (221) is located at the air inlet (160) of the fan, the second end (222) is connected to the hub (210), the width of the blade (220) at the first end (221) is smaller than the width of the blade (220) at the second end (222), the width of the blade (220) is the width of the blade (220) in the direction of the airflow.

2. The impeller of claim 1, wherein The width of the blade (220) gradually increases from the first end (221) to the second end (222).

3. The impeller of claim 1, wherein Each of the blades (220) has a first edge (223) and a second edge (224) in the direction of the airflow, the first edge (223) gradually curves away from the second edge (224) to form an arc-shaped edge from the first end (221) to the second end (222).

4. The impeller of claim 3, wherein The straight-line distance between the two ends of the first edge (223) is between 66mm and 70mm, and the straight-line distance between the projections of the two ends of the first edge (223) on the plane where the second end (222) is located is between 4mm and 7mm.

5. The impeller of claim 3, wherein The opposite bending angles of the two ends of the first edge (223) are between 3° and 6°.

6. The impeller of claim 3, wherein The perpendicular distance between the axis of the hub (210) and the first edge (223) is between 81mm and 87mm.

7. The impeller of any one of claims 1 to 6, wherein The blade (220) is an arc-shaped blade (220), and the curvature of the blade (220) is between 80° and 84°.

8. A fan, characterized by The fan comprises: a volute, the volute is provided with an inner cavity (120) and an air inlet (160) communicating with the inner cavity (120); the impeller (200) of any one of claims 1 to 7, the impeller (200) is arranged in the inner cavity (120), and the first end (221) is located at the air inlet (160).

9. The fan of claim 8, wherein, The volute comprises: a first shell portion (140), the cross-sectional shape of the first shell portion (140) is an arc-shaped structure with a middle portion protruding outward in the radial direction of the volute, the first shell portion (140) is provided with the inner cavity (120) and forms the air inlet (160); a second shell portion (150), the connection between the first shell portion (140) and the second shell portion (150) forms a volute tongue (130), and the second shell portion (150) forms an air outlet (110).

10. An air conditioner characterized by comprising: The fan comprises the fan of claim 8 or 9.

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