Integrated current collector and fan

Abstract

The application relates to an integrated current collector and a fan, which can reduce processing and assembling difficulty and cost while retaining the function of guiding airflow pre-rotation and improving aerodynamic performance. The integrated current collector is arranged at an air inlet of a volute and comprises an air inlet ring and a plurality of convex blocks. The convex blocks are integrally formed on the air inlet ring, and the convex blocks are arranged at intervals along the circumference of the air inlet ring to form a guide groove for guiding airflow pre-rotation between any two adjacent convex blocks.

Description

Technical Field

[0001] This application relates to the field of home appliance technology, and in particular to an integrated collector and fan. Background Technology

[0002] In the development and design of range hoods, airflow and noise performance are important indicators for evaluating the range hood's smoke extraction effect and noise experience. In order to enable the range hood to produce low noise under a certain airflow (referred to as aerodynamic performance), the conventional solution is to install a collector at the air inlet of the range hood's volute.

[0003] Currently, the structure of collectors is constantly being improved and optimized to achieve better aerodynamic performance. Among the many optimization directions for collector structures, setting a spiral structure on the collector surface to guide airflow pre-swirl is an effective method to improve aerodynamic performance.

[0004] However, such spiral-structured collectors typically have additional sheet-like guide structures. While these structures can guide the airflow to pre-swirl, they are difficult to machine integrally with the collector cover and often require separate machining before assembly. Clearly, the more complex these sheet-like guide structures are, the greater the difficulty in machining and assembly, and the higher the cost. Summary of the Invention

[0005] Therefore, in order to address the problem that conventional collectors with spiral structures are difficult to process and assemble and have high costs, this application provides an integrated collector and fan that can reduce processing and assembly difficulty and lower costs while retaining the pre-swirl function of guiding airflow and improving aerodynamic performance.

[0006] In one embodiment of this application, an integrated collector is provided for installation at the air inlet of a volute, comprising:

[0007] Air inlet ring; and

[0008] Multiple protrusions, wherein the protrusions are integrally formed on the air inlet ring, and the multiple protrusions are arranged at circumferential intervals along the air inlet ring to form a guide groove for guiding airflow pre-swirl between any two adjacent protrusions.

[0009] According to one embodiment of this application, the air inlet ring includes an annular outer ring portion for fixed connection with the volute, an annular inner ring portion for extending rearward into the volute, and an annular protrusion extending forward from the annular outer ring portion to the annular inner ring portion; the annular protrusion is intermittently pressed rearward to form the rearwardly recessed guide groove, such that the unpressed portion of the annular protrusion provides the convex bulge.

[0010] According to one embodiment of this application, the air inlet ring includes an annular outer ring portion for fixed connection with the volute, an annular inner ring portion for extending rearward into the volute, and an annular protrusion extending forward from the annular outer ring portion to the annular inner ring portion; the annular protrusion is intermittently pressed forward to form the forward-protruding bulge, such that the unpressed portion of the annular protrusion provides the air guide groove.

[0011] According to one embodiment of this application, the guide groove extends curvedly from the outer annular portion to the inner annular portion to form an arc-shaped molding groove.

[0012] According to one embodiment of this application, the annular protrusion satisfies the following relationship:

[0013] D yy +10mm≤D hy ≤D yy +40mm;

[0014] D yn -30mm≤D hn ≤D yn -4mm;

[0015] Where: D hy D is the outer diameter of the annular protrusion; hn D is the inner diameter of the annular protrusion; yy D is the outer diameter of the impeller inside the volute; yn This is the inner diameter of the impeller inside the volute.

[0016] According to one embodiment of this application, the diameter difference between the inner and outer diameters of the convex bulge and the inner and outer diameters of the annular convex portion is between 1 mm and 10 mm.

[0017] According to one embodiment of this application, the integrated current collector satisfies the following relationship:

[0018]

[0019] Where: D by D is the outer diameter of the convex hull; bn θ1 is the inner diameter of the convex hull; θ2 is the inlet angle of the guide groove; Δd2 is the convex hull spacing of the integrated collector.

[0020] According to one embodiment of this application, the inlet angle of the guide channel is 30°; the outlet angle of the guide channel is 60°.

[0021] According to one embodiment of this application, the occupancy angle coefficient K2 of the guide channel satisfies the following relationship:

[0022]

[0023] Where: n is the number of the guide channels; ∠EAF is the central angle of the guide channels.

[0024] According to another aspect of this application, this application further provides a wind turbine, comprising:

[0025] Snail shell;

[0026] An impeller rotatably mounted on the volute; and

[0027] The integrated collector described above is disposed at the air inlet of the volute.

[0028] In summary, when the impeller rotates relative to the volute to create a negative pressure within the volute, the external air, under the influence of this negative pressure, first flows through the guide groove of the integrated collector to undergo pre-swirl before flowing into the volute, which helps improve aerodynamic performance. Simultaneously, since the convex bulge and the inlet ring are integrally formed, such as through sheet metal molding, the integrated collector does not require the complex assembly processes of traditional sheet-like guide structures, thus helping to improve aerodynamic performance while reducing costs. Attached Figure Description

[0029] Figure 1 This is a perspective view of a fan according to one embodiment of this application;

[0030] Figure 2 A cross-sectional schematic diagram of the fan according to the above embodiments of this application is shown;

[0031] Figure 3 It shows Figure 2 An enlarged schematic diagram of a portion P in the fan shown;

[0032] Figure 4 A first example of an integrated collector in a wind turbine according to the above embodiments of this application is shown;

[0033] Figure 5 A cross-sectional schematic diagram of the integrated current collector of the first example described above in this application is shown;

[0034] Figure 6 A second example of an integrated collector in a wind turbine according to the above embodiments of this application is shown;

[0035] Figure 7 A cross-sectional schematic diagram of the integrated current collector of the second example described above in this application is shown;

[0036] Figure 8 A schematic diagram illustrating the design principle of the guide channel in the integrated collector of the second example described above in this application is shown.

[0037] Figure 9 A schematic diagram illustrating the design principle of the convex hull in the integrated current collector of the second example described above in this application is shown.

[0038] Explanation of key component symbols:

[0039] 1. Integrated collector; 10. Air inlet ring; 11. Annular outer ring; 12. Annular inner ring; 13. Annular protrusion; 20. Protrusion; 200. Guide groove; 2. Volute; 3. Impeller.

[0040] The above description of the main component symbols, together with the accompanying drawings and specific embodiments, provides a further detailed explanation of this application. Detailed Implementation

[0041] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0042] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0044] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0045] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0046] Considering that existing sheet-like airflow guiding structures are difficult to integrally mold with the airflow collector, they often need to be processed separately and then assembled together. Moreover, the more complex these sheet-like airflow guiding structures are, the greater the difficulty of processing and assembly, and the higher the cost. Therefore, this application provides an integrated airflow collector and fan, which can reduce the difficulty of processing and assembly and lower the cost while retaining the pre-swirl function of guiding airflow and improving aerodynamic performance.

[0047] Specifically, see the attached document. Figures 1 to 3 As shown, one embodiment of this application provides a fan, which may include a volute 2, an impeller 3 rotatably disposed on the volute 2, and an integrated collector 1 disposed at the air inlet of the volute 2, so as to guide the airflow to pre-swirl through the integrated collector 1 to improve aerodynamic performance. It is understood that the impeller of this application may include, but is not limited to, a rotating shaft, a motor driven and connected to the rotating shaft, and a plurality of blades arranged circumferentially at intervals along the rotating shaft, which will not be described in detail here.

[0048] More specifically, such as Figures 2 to 9 As shown, the integrated collector 1 may include an inlet ring 10 for fixing to the volute 2 and a plurality of protrusions 20 integrally formed on the inlet ring 10; the plurality of protrusions 20 are arranged at intervals along the circumference of the inlet ring 10 to form a guide groove 200 for guiding airflow pre-swirl between any two adjacent protrusions 20. In this way, when the impeller 3 rotates relative to the volute 2 to create a negative pressure in the volute 2, the external air first flows through the guide groove 200 of the integrated collector 1 under the action of the negative pressure to undergo pre-swirl, and then flows into the volute 2, which helps to improve aerodynamic performance.

[0049] It is worth noting that since the convex bulge 20 and the air inlet ring 10 are integrally formed, such as by sheet metal pressing, the integrated collector 1 does not require complex assembly processing like traditional sheet-like air guide structures, which helps to improve aerodynamic performance while reducing costs.

[0050] Exemplarily, in the first example of this application, such as Figure 4 and Figure 5 As shown, the air inlet ring 10 may include an annular outer ring portion 11 for fixed connection with the volute 2, an annular inner ring portion 12 for extending rearward into the volute 2, and an annular protrusion 13 extending forward from the annular outer ring portion 11 to the annular inner ring portion 12; the annular protrusion 13 is intermittently pressed rearward to form the rearwardly recessed guide groove 200, such that the unpressed portion of the annular protrusion 13 provides the bulge 20. It is understood that the center of the air inlet ring 10 mentioned in this application corresponds to the rotation center of the impeller 3.

[0051] Optionally, such as Figure 4 As shown, the guide groove 200 extends curvedly from the outer annular ring portion 11 to the inner annular ring portion 12 to form an arc-shaped forming groove that matches the rotation direction of the impeller 3, which facilitates better guidance of airflow pre-swirl.

[0052] Optionally, such as Figure 5 As shown, the bottom of the guide groove 200 is flush with the front surface of the annular outer ring portion 11 to form an arc-shaped convex hull structure with alternating convex and flat surfaces. This facilitates increasing the depth of the guide groove 200, thereby better guiding the airflow pre-swirl by utilizing the deeper spiral gap between the arc-shaped convex hulls.

[0053] It is worth noting that in the first example of this application, although the arc-shaped convex structure formed by backward pressing can guide the airflow pre-swirl and improve aerodynamic performance while ensuring that the integrated collector 1 has an integrated structure and reducing processing and assembly costs, the bottom of the guide groove 200 is flush with the front surface of the annular outer ring 11 and is closer to the shaft end face of the impeller 3. Therefore, in order to avoid the integrated collector 1 from colliding with the impeller 3, the axial length of the impeller 3 needs to be shortened, which may lead to a decrease in the overall aerodynamic performance of the fan.

[0054] To improve the overall aerodynamic performance of the fan, additional Figures 6 to 9 A second example of the integrated current collector 1 according to the above embodiments of this application is shown. Compared to the first example of this application, the integrated current collector 1 of the second example differs in that: Figure 6 and Figure 7As shown, the annular protrusion 13 is intermittently pressed forward to form a further forward-protruding bulge 20, such that the unpressed portion of the annular protrusion 13 provides the guide groove 200. Thus, the bottom of the guide groove 200 protrudes forward beyond the annular outer ring 11, freeing up more space for the impeller 3, allowing for the placement of a longer axially length impeller 3, which improves the overall aerodynamic performance of the fan.

[0055] In other words, in the second example described above in this application, the integrated collector 1, while retaining the full-circle annular protrusion corresponding to the impeller 3, further provides discrete bulges on the annular protrusion 13. This not only frees up more space for the impeller 3 to accommodate an impeller 3 with a longer axial length, but also reduces the length of the plastic deformation draw rope required for bulge forming, which is beneficial for mold processing. It is understood that the integrated collector 1 mentioned in this application can be formed by pressing sheet metal twice with a mold, or by pressing sheet metal once with a mold; or, in other examples of this application, the integrated collector 1 can also be formed by mold casting or die casting, which will not be elaborated further in this application.

[0056] Optionally, such as Figure 2 and Figure 8 As shown, the outer diameter of the annular protrusion 13 satisfies the following relationship: D yy +10mm≤D hy ≤D yy +40mm; where: D hy D is the outer diameter of the annular protrusion 13; yy This is the outer diameter of the impeller 3. In this way, the integrated collector 1 can reserve enough space on the outside of the impeller 3 to avoid structural interference.

[0057] Preferably, the difference between the outer diameter of the annular protrusion 13 and the outer diameter of the impeller 3 is between 15mm and 30mm, so as to reserve an appropriate space on the outside of the impeller 3, which can avoid structural interference and reduce the overall size of the integrated collector 1.

[0058] Optionally, such as Figure 2 and Figure 8 As shown, the inner diameter of the annular protrusion 13 satisfies the following relationship: D yn -30mm≤D hn ≤D yn -4mm; where: D hn D is the inner diameter of the annular protrusion 13; yn This is the inner diameter of the impeller 3. In this way, the integrated collector 1 can reserve enough space inside the impeller 3 to avoid structural interference.

[0059] Preferably, the difference between the inner diameter of the impeller 3 and the inner diameter of the annular protrusion 13 is between 10mm and 20mm, so as to reserve an appropriate space on the inner side of the impeller 3, which can both avoid structural interference and ensure a sufficiently large air inlet diameter.

[0060] It is worth noting that, such as Figure 8 As shown, since the inner and outer diameters of the convex bulge 20 correspond to the inner and outer diameters of the annular convex portion 13 respectively, such as the inner diameter D of the convex bulge 20... bn The inner diameter D of the annular protrusion 13 hn Satisfying the relation: D bn =D hn -Δd1; the outer diameter D of the convex hull 20 by The outer diameter D of the annular protrusion 13 hy Satisfying the relation: D by =D hy +Δd1; Therefore, in order to obtain the inner and outer diameters of the convex hull 20, this application only needs to select a suitable diameter difference Δd1. Although the larger the diameter difference Δd1, the greater the depth of the guide groove 200 formed between the convex hulls 20 (i.e., the more significant the guide structure), and the better the pre-swirl effect of guiding the airflow; however, as the diameter difference Δd1 increases, the tensile deformation between the convex hull 20 and the annular convex part 13 will be greater, which not only increases the processing difficulty, but also leads to a smaller air inlet area of ​​the collector.

[0061] In summary, the diameter difference Δd1 between the inner and outer diameters of the convex bulge 20 and the inner and outer diameters of the annular convex part 13 can be between 1 mm and 10 mm.

[0062] Preferably, the diameter difference Δd1 between the inner and outer diameters of the bulge 20 and the inner and outer diameters of the annular bulge 13 can be between 2mm and 6mm, so as to reduce the plastic deformation stretching length required for bulge forming and reduce the processing difficulty while obtaining a better pre-rotation effect.

[0063] Furthermore, from the perspective of sheet metal part mold forming, such as Figure 8 As shown, the lower limit of the convex hull spacing Δd2 (i.e., the circumferential distance between two adjacent convex hulls 20, which is equal to the circumferential width of the guide groove 200) of the integrated collector 1 of this application will be affected by the diameter difference Δd1. This is because the convex hull 20 is formed by metal plastic deformation on the basis of the annular convex part 13. Therefore, the metal between the convex hulls 20 will be stretched to form a height difference. If the convex hull spacing Δd2 is selected too small, process problems such as tearing and deformation are likely to occur.

[0064] In summary, the convex hull spacing Δd2 of the integrated current collector 1 of this application should satisfy the following relationship: Δd2≥K1×Δd1; where: K1 is the forming coefficient; Δd1 is the diameter difference between the inner and outer diameters of the convex hull 20 and the inner and outer diameters of the annular convex portion 13.

[0065] Furthermore, since a large convex hull spacing Δd2 can easily lead to root cutting, the design of the inlet and outlet angles of the guide channel 200 is limited, resulting in a decrease in the guiding effect. Therefore, the convex hull spacing Δd2 of the integrated collector 1 can be selected according to the lower limit, that is, satisfying the relationship: Δd2≥K1×Δd1; where: K1 is the forming coefficient that takes a value between 1 and 6; Δd1 is the diameter difference between the inner and outer diameters of the convex hull 20 and the inner and outer diameters of the annular convex part 13.

[0066] Preferably, the forming factor K1 is between 2 and 4.

[0067] It is worth noting that one reason why the integrated collector 1 can optimize aerodynamic performance is that it can transform the airflow flowing towards the center of the volute (i.e., towards the rotation center of the impeller 3) into airflow consistent with the rotation direction of the impeller 3, thereby reducing energy loss caused by airflow reversal. Based on the above principle, the inlet angle θ1 of the guide channel 200 in the integrated collector 1 should be as close to 0° as possible, while the outlet angle θ2 of the guide channel 200 should be as close to 90° as possible. It is understood that the inlet angle θ1 mentioned in this application refers to the angle between the tangent of the construction arc of the guide channel 200 at the inlet and the normal to the outer circle of the annular protrusion 13; the outlet angle θ2 mentioned in this application refers to the angle between the tangent of the construction arc of the guide channel 200 at the outlet and the normal to the inner circle of the annular protrusion 13.

[0068] However, the flow guide 200 is prone to root cutting when the inlet angle θ1 is too small and / or the outlet angle θ2 is too large. Therefore, the integrated collector 1 of this application needs to ensure that the flow guide 200 does not have root cutting problems while making the inlet angle θ1 as small as possible and the outlet angle θ2 as large as possible.

[0069] For example, such as Figure 8 As shown, the center of the arc CD of the guide channel 200 is point B, and the radius is R1; the center of the air inlet ring 10 is A; then, from Figure 4 It is easy to see that when the relation is satisfied... At that time, the guide channel 200 will not experience root cutting. In order to make the inlet angle θ1 as small as possible and the outlet angle θ2 as large as possible, the integrated collector 1 of this application selects the extreme case, that is, the guide channel 200 of the integrated collector 1 satisfies the following relationship (1):

[0070]

[0071] In the formula: L AB R1 is the straight-line distance between the center B of the arc of the guide channel 200 and the center A of the air inlet ring 10; R1 is the radius of the arc of the guide channel 200; Δd2 is the convex hull spacing of the integrated collector 1; D bn θ1 is the inner diameter of the convex hull 20; θ2 is the inlet angle of the guide channel 200; θ2 is the outlet angle of the guide channel 200.

[0072] In triangles ABC and ABD, it is easy to obtain the following by the Law of Cosines:

[0073]

[0074] The following relationship can be simplified to (2):

[0075] D by 2 +4·D by ·R1·sin(θ1)=D bn 2 +4·D bn ·R1·sin(θ2)=D bn 2 +4·D bn ·R1·cos(θ1)(2);

[0076]

[0077] Combining the above relations (1), (2), and (3), we can obtain the following relations (4) and (5):

[0078]

[0079] 4·R1(D bn -Δd2-D bn cos(θ1))+Δd2 2 -2D bn ·θd2=0 (5)

[0080] Integrating the above relations (4) and (5), we can obtain that the integrated current collector 1 satisfies the following relation:

[0081]

[0082] In the formula: D by D is the outer diameter of the convex hull 20; bn θ is the inner diameter of the convex hull 20; θ1 is the inlet angle of the guide channel 200; Δd2 is the convex hull spacing of the integrated collector 1.

[0083] It is worth noting that, after the initial design of the integrated collector 1, all parameters in the above equations are constants except for the inlet angle θ1, which is unknown. Substituting these parameters yields the equations related to the inlet angle θ1. For example, the outer diameter D of the convex hull of the integrated collector 1... by 300mm, inner diameter D of the convex bulge bn Given a diameter of 250mm, a diameter difference Δd1 of 3mm, and a forming coefficient K1 of 4, the convex hull spacing Δd2 of the integrated collector 1 is 12mm. Substituting these values ​​into the above formula, we can obtain:

[0084]

[0085] Simplifying, we get: 41685cos(θ1)-8784sin(θ1)=32725;

[0086] Solving for these equations, we get: cos(θ1)≈0.885; sin(θ1)≈0.465.

[0087] Therefore, the inlet angle θ1 of the guide channel 200 is approximately 27.1°; the outlet angle θ2 of the guide channel 200 is 90° - θ1, which is approximately 62.9°.

[0088] Preferably, the inlet angle θ1 of the guide channel 200 can be rounded up to 30°; the outlet angle θ2 of the guide channel 200 can be rounded down to 60°.

[0089] It is worth noting that when the fan is running, near the integrated collector 1, the airflow can be divided into guiding airflow and bypass airflow based on the flow path. Guiding airflow refers to the airflow flowing along the extension direction of the guide groove 200 of the integrated collector 1, while bypass airflow refers to the airflow entering the volute 2 radially. Therefore, when the number of protrusions 20 is small, the bypass airflow passes through at most one guide groove 200; however, when the number of protrusions 20 is large, the bypass airflow may pass through multiple guide grooves 200. Generally, bypass airflow passing through multiple guide grooves 200 will adversely affect aerodynamic performance. Therefore, this application needs to rationally design the number of protrusions 20 to avoid bypass airflow passing through multiple guide grooves.

[0090] For example, such as Figure 8 and Figure 9 As shown, A is the center of the air inlet ring 10, B is the center of the arc of the guide groove 200, E is the intersection of the outer wall of the guide groove 200 (i.e., the side wall of the guide groove 200 away from the center B) and the outer peripheral wall of the annular protrusion 13, and E is the intersection of the inner wall of the guide groove 200 (i.e., the side wall of the guide groove 200 close to the center B) and the inner peripheral wall of the annular protrusion 13. Therefore, the convex spacing Δd2 of the integrated collector 1; the outer diameter D of the convex convex 20by The inner diameter D of the convex hull 20 bn After the inlet angle θ1 and outlet angle θ2 of the guide channel 200 are determined by the above method, the side lengths AE, AB, AF, BE, and BF are also known and satisfy the following relationship:

[0091]

[0092] For triangles ABF and ABE, the following relationship can be easily obtained by the Law of Cosines:

[0093]

[0094] After sorting, we can obtain:

[0095]

[0096] It is worth noting that, since the central angle ∠EAF = ∠EAB - ∠FAB corresponding to each guide channel 200 in the integrated collector 1 of this application, to avoid the airflow crossing multiple guide channels 200, n × ∠EAF ≤ 360° should be satisfied, where n is the number of guide channels 200. It is understood that in the integrated collector 1 of this application, the number of convex hulls 20 and guide channels 200 is the same.

[0097] Furthermore, this application can define the occupancy angle coefficient K2 of the guide channel 200 to satisfy the following relationship:

[0098]

[0099] In the formula: n is the number of the guide grooves 200; ∠EAF is the central angle of the guide grooves 200.

[0100] Optionally, the occupancy angle coefficient K2 of the guide channel 200 is typically between 0.6 and 1.

[0101] Preferably, the occupancy angle coefficient K2 of the guide channel 200 is between 0.7 and 0.9, so as to ensure the airflow pre-swirl effect while avoiding the airflow from passing through multiple guide channels 200.

[0102] For example, when the outer diameter D of the convex hull of the integrated collector 1 by 300mm, inner diameter D of the convex bulge bn The diameter is 250 mm, the convex hull spacing Δd2 is 12 mm; the inlet angle θ1 of the guide channel 200 is 30°; the outlet angle θ2 of the guide channel 200 is 60°; substituting into the relational formula, we can obtain:

[0103]

[0104]

[0105] ∠EAF=∠EAB-∠FAB=26.41°-6.59°=19.82°.

[0106] Then, substituting ∠EAF = 19.82° into the relation... We can obtain:

[0107]

[0108] Finally, we can solve for: 12.7 ≤ n ≤ 16.3.

[0109] Preferably, the number of the convex hull 20 is between 13 and 16.

[0110] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0111] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are quite specific and detailed. However, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. An integrated air collector, used for installation at the air inlet of a volute, characterized in that, include: Air inlet ring; and Multiple convex bulges, wherein the convex bulges are integrally formed on the air inlet ring, and the multiple convex bulges are arranged at intervals along the circumference of the air inlet ring to form a guide groove for guiding airflow pre-swirl between any two adjacent convex bulges; The integrated current collector satisfies the following relationship: ； Where: D by D is the outer diameter of the convex hull; bn θ1 is the inner diameter of the convex hull; θ2 is the inlet angle of the guide groove; Δd2 is the convex hull spacing of the integrated collector.

2. The integrated current collector according to claim 1, characterized in that, The air inlet ring includes an annular outer ring portion for fixed connection with the volute, an annular inner ring portion for extending rearward into the volute, and an annular protrusion extending forward from the annular outer ring portion to the annular inner ring portion; the annular protrusion is intermittently pressed rearward to form the rearwardly recessed guide groove, such that the unpressed portion of the annular protrusion provides the bulge.

3. The integrated current collector according to claim 1, characterized in that, The air inlet ring includes an annular outer ring portion for fixed connection with the volute, an annular inner ring portion for extending rearward into the volute, and an annular protrusion extending forward from the annular outer ring portion to the annular inner ring portion; the annular protrusion is intermittently pressed forward to form the forward-protruding bulge, such that the unpressed portion of the annular protrusion provides the air guide groove.

4. The integrated current collector according to claim 2 or 3, characterized in that, The guide groove extends curvedly from the outer annular portion to the inner annular portion to form an arc-shaped molding groove.

5. The integrated current collector according to claim 2 or 3, characterized in that, The annular protrusion satisfies the following relationship: D yy +10mm≤D hy ≤D yy +40mm; D yn -30mm≤D hn ≤D yn -4mm; Where: D hy D is the outer diameter of the annular protrusion; hn D is the inner diameter of the annular protrusion; yy D is the outer diameter of the impeller inside the volute; yn This is the inner diameter of the impeller inside the volute.

6. The integrated current collector according to claim 3, characterized in that, The diameter difference between the inner and outer diameters of the convex bulge and the inner and outer diameters of the annular convex part is between 1 mm and 10 mm.

7. The integrated current collector according to any one of claims 1 to 3, characterized in that, The inlet angle of the guide channel is 30°; the outlet angle of the guide channel is 60°.

8. The integrated current collector according to any one of claims 1 to 3, characterized in that, The occupancy angle coefficient K2 of the guide channel satisfies the following relationship: ； Where: n is the number of the guide channels; ∠EAF is the central angle of the guide channels.

9. A fan, characterized in that, include: Snail shell; An impeller rotatably mounted on the volute; as well as The integrated collector as described in any one of claims 1 to 8, wherein the integrated collector is disposed at the air inlet of the volute.

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