Integrated current collector and fan

Abstract

The invention relates to an integrated current collector and a fan, which can reduce the processing and assembling difficulty and lower the cost while retaining the function of guiding the air flow to pre-swirl and improving the pneumatic performance. The integrated current collector is used for being arranged at an air inlet of a volute and comprises an air inlet ring and an air outlet ring, the convex hulls are integrally formed on the air inlet ring, and the convex hulls are arranged in the circumferential direction of the air inlet ring at intervals, so that a flow guide groove used for guiding air flow to pre-swirl is formed between any two adjacent convex hulls.

Description

Technical Field

[0001] The present application relates to the technical field of household appliances, and in particular to an integrated current collector and fan. Background Art

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

[0003] At present, the structure of the collector is being continuously improved and optimized to obtain better aerodynamic performance. Among the many optimization directions of the collector structure, setting a spiral structure on the collector surface to guide the airflow pre-swirl is an effective method to improve aerodynamic performance.

[0004] However, this type of collector with a spiral structure usually has an additional sheet-like guide structure. Although it can guide the airflow to pre-swirl, these sheet-like guide structures are difficult to be integrally formed with the collector cover and often need to be processed separately and then assembled together. Obviously, the more complex these sheet-like guide structures are, the more difficult it is to process and assemble them, and the higher the cost. Summary of the invention

[0005] Based on this, it is necessary to address the problems of high difficulty and high cost in processing and assembly of conventional collectors with spiral structures. The present application provides an integrated collector and fan, which can reduce the difficulty of processing and assembly and reduce costs while retaining the function of guiding airflow pre-swirl and improving aerodynamic performance.

[0006] In one embodiment of the present application, the present application provides an integrated collector for being arranged at the air inlet of a volute, comprising:

[0007] Air inlet ring; and

[0008] A plurality of convex humps, wherein the convex humps are integrally formed on the air inlet ring, and the plurality of convex humps 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 humps.

[0009] According to one embodiment of the present application, the air inlet ring includes an annular outer ring portion for fixedly connecting with the volute, an annular inner ring portion for extending backward into the volute, and an annular convex portion extending forwardly from the annular outer ring portion to the annular inner ring portion; the annular convex portion is intermittently pressed backward to form the guide groove that is recessed backward, so that the unpressed portion of the annular convex portion provides the convex bump.

[0010] According to one embodiment of the present application, the air inlet ring includes an annular outer ring portion for fixedly connecting with the volute, an annular inner ring portion for extending backward into the volute, and an annular convex portion extending forwardly from the annular outer ring portion to the annular inner ring portion; the annular convex portion is intermittently pressed forward to form the convex bump protruding forward, so that the unpressed portion of the annular convex portion provides the guide groove.

[0011] According to an embodiment of the present application, the guide groove extends in a curved manner from the annular outer ring portion to the annular inner ring portion to form an arc-shaped pressed groove.

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

[0013] D yy +10mm≤D hy ≤D yy +40mm;

[0014] D yn -30mm≤D hn ≤D yn -4mm;

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

[0016] According to one embodiment of the present application, the diameter differences between the inner and outer diameters of the convex hull and the inner and outer diameters of the annular convex portion are both between 1 mm and 10 mm.

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

[0018]

[0019] Where: D by is the outer diameter of the convex hull; D bn is the inner diameter of the convex hull; θ 1 is the inlet angle of the guide groove; Δd 2 is the convex hull spacing of the integrated current collector.

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

[0021] According to one embodiment of the present application, the occupancy angle coefficient K of the guide groove is 2 Satisfies the relationship:

[0022]

[0023] Wherein: n is the number of the guide grooves; ∠EAF is the central angle of the guide groove.

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

[0025] snail shell;

[0026] an impeller rotatably disposed on the volute; and

[0027] Any of the above-mentioned integrated collectors, wherein the integrated collector is arranged at the air inlet of the volute.

[0028] In summary, when the impeller rotates relative to the volute to form a negative pressure in the volute, the external air first flows through the guide groove of the integrated collector under the action of the negative pressure to generate pre-swirl, and then flows into the volute, which helps to improve the aerodynamic performance. At the same time, since the convex bulge and the air inlet ring are integrally formed, such as by sheet metal pressing, the integrated collector does not need to be complicatedly assembled like the traditional sheet-like guide structure, which helps to reduce costs while improving the aerodynamic performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A three-dimensional schematic diagram of a fan according to an embodiment of the present application;

[0030] Figure 2 A cross-sectional schematic diagram of the fan of the above embodiment of the present application is shown;

[0031] Figure 3 Shows Figure 2 An enlarged schematic diagram of a local area P in the fan is shown;

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

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

[0034] Figure 6 A second example of the integrated current collector in the wind turbine of the above embodiment of the present application is shown;

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

[0036] Figure 8A schematic diagram showing the design principle of the flow guide groove in the integrated current collector of the second example of the present application is shown;

[0037] Fig. 9 A schematic diagram of the design principle of the convex bulge in the integrated current collector of the second example of the present application is shown.

[0038] Description of main component symbols:

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

[0040] The above description of the main component symbols is combined with the accompanying drawings and specific implementation methods to further illustrate the present application in detail. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0042] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0044] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0046] Considering that the existing sheet-like flow guide structure is difficult to be integrally formed with the collector, not only do they often need to be processed separately and then assembled together, but the more complex these sheet-like flow guide structures are, the more difficult and costly they are to process and assemble. Therefore, the present application provides an integrated collector and fan, which can reduce the difficulty of processing and assembly and reduce costs while retaining the function of guiding the pre-swirl of the airflow and improving the aerodynamic performance.

[0047] Specifically, refer to the attached Figures 1 to 3 As shown, one embodiment of the present 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 pre-swirl through the integrated collector 1 to improve the aerodynamic performance. It is understood that the impeller of the present application may include, but is not limited to, a rotating shaft, a motor drivingly connected to the rotating shaft, and a plurality of blades arranged at intervals along the circumference of the rotating shaft, and the present application will not repeat them here.

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

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

[0050] For example, in the first example of the present application, Figure 4 and Figure 5 As shown, the air inlet ring 10 may include an annular outer ring portion 11 for fixedly connecting with the volute 2, an annular inner ring portion 12 for extending backward into the volute 2, and an annular convex portion 13 extending forwardly from the annular outer ring portion 11 to the annular inner ring portion 12 in a curved manner; the annular convex portion 13 is intermittently pressed backward to form the guide groove 200 that is recessed backward, so that the unpressed portion of the annular convex portion 13 provides the convex hull 20. It can be understood that the center of the air inlet ring 10 mentioned in the present application corresponds to the rotation center of the impeller 3.

[0051] Alternatively, if Figure 4 As shown, the guide groove 200 extends in a curved manner from the annular outer ring portion 11 to the annular inner ring portion 12 to form an arc-shaped pressed groove matching the rotation direction of the impeller 3, so as to better guide the airflow pre-swirl.

[0052] Alternatively, if 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 bulge structure with convex and flat alternating portions, which is convenient for increasing the depth of the guide groove 200, thereby utilizing the deeper spiral gaps between the arc-shaped convex bulges to better guide the airflow pre-swirl.

[0053] It is worth noting that in the above-mentioned first example of the present application, although the arc-shaped convex bulge structure formed by the backward pressing can guide the airflow pre-rotation and improve the aerodynamic performance while ensuring that the integrated collector 1 has an integrated structure and reduces the processing and assembly costs; however, the bottom of the guide groove 200 is flush with the front surface of the annular outer ring portion 11 and is closer to the axial 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 comprehensive aerodynamic performance of the fan.

[0054] In order to improve the comprehensive aerodynamic performance of the fan, Figures 6 to 9 A second example of the integrated current collector 1 according to the above embodiment of the present application is shown. Compared with the above first example of the present application, the difference of the integrated current collector 1 according to the second example of the present application is that: Figure 6 and Figure 7As shown, the annular protrusion 13 is intermittently pressed forward to form the convex bump 20 that further protrudes forward, so that the unpressed portion of the annular protrusion 13 provides the guide groove 200. In this way, the groove bottom of the guide groove 200 protrudes forward from the annular outer ring portion 11, so as to make more space for the impeller 3, and the impeller 3 with a longer axial length can be placed, which is beneficial to improving the comprehensive aerodynamic performance of the fan.

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

[0056] Alternatively, if Figure 2 and Figure 8 As shown, the outer diameter of the annular protrusion 13 satisfies the relationship: D yy +10mm≤D hy ≤D yy +40mm; of which: D hy D is the outer diameter of the annular protrusion 13; yy is the outer diameter of the impeller 3. In this way, the integrated collector 1 can reserve enough space outside 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 15 mm and 30 mm, so as to reserve a suitable space outside the impeller 3, which can avoid structural interference and help reduce the overall size of the integrated collector 1.

[0058] Alternatively, if Figure 2 and Figure 8 As shown, the inner diameter of the annular protrusion 13 satisfies the relationship: D yn -30mm≤D hn ≤D yn -4mm; among which: D hn D is the inner diameter of the annular protrusion 13; yn 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 10 mm and 20 mm, so that a suitable space is reserved inside the impeller 3, which can avoid structural interference and help ensure a sufficiently large air inlet diameter.

[0060] It is worth noting that Figure 8 As shown, since the inner and outer diameters of the convex 20 correspond to the inner and outer diameters of the annular convex portion 13, the inner diameter D of the convex 20 is bn The inner diameter D of the annular protrusion 13 is hn Satisfy the relationship: D bn =D hn -Δd 1 The outer diameter D of the convex hull 20 by The outer diameter D of the annular protrusion 13 is hy Satisfy the relationship: D by =D hy +Δd 1 Therefore, in order to obtain the inner and outer diameters of the convex hull 20, the present application only needs to select a suitable diameter difference Δd 1 Although the diameter difference Δd 1 The larger the diameter difference Δd is, the greater the depth of the guide groove 200 formed between the convex humps 20 (that is, the more significant the guide structure is), and the better the pre-swirl effect of guiding the airflow is; however, as the diameter difference Δd 1 The increase of will lead to greater tensile deformation between the convex hull 20 and the annular convex portion 13, which not only increases the processing difficulty but also causes the air inlet area of ​​the collector to become smaller.

[0061] In summary, the diameter difference Δd between the inner and outer diameters of the convex 20 and the inner and outer diameters of the annular convex portion 13 is 1 It can be between 1mm and 10mm.

[0062] Preferably, the diameter difference Δd between the inner and outer diameters of the convex 20 and the inner and outer diameters of the annular convex portion 13 is 1 It can be between 2 mm and 6 mm, so as to obtain a better pre-rotation effect while reducing the plastic deformation stretching length required for bulge forming and reducing the processing difficulty.

[0063] In addition, from the perspective of sheet metal mold forming, such as Figure 8 As shown, the convex hull spacing Δd of the integrated current collector 1 of the present application is 2 The lower limit of the size (i.e., the circumferential distance between two adjacent convex humps 20 is equal to the circumferential width of the guide groove 200) is affected by the diameter difference Δd 1 This is because the convex 20 is formed by metal plastic deformation on the basis of the annular convex portion 13, so the metal between the convex 20 will be stretched to form a height difference. 2If the size is too small, process problems such as tearing and deformation may occur easily.

[0064] In summary, the convex hull spacing Δd of the integrated current collector 1 of the present application is 2 Should satisfy the relationship: Δd 2 ≥K 1 ×Δd 1 ; Where: K 1 is the forming coefficient; Δd 1 is the diameter difference between the inner and outer diameters of the convex hump 20 and the inner and outer diameters of the annular convex portion 13 .

[0065] Furthermore, due to the convex hull spacing Δd 2 When the angle is larger, undercutting is likely to occur, which limits the design of the inlet angle and outlet angle of the guide groove 200 and reduces the guide effect. Therefore, the convex hull spacing Δd of the integrated collector 1 is 2 It can be selected according to the lower limit, that is, satisfying the relationship: Δd 2 ≥K 1 ×Δd 1 ; Where: K 1 is the forming coefficient ranging from 1 to 6; Δd 1 is the diameter difference between the inner and outer diameters of the convex hump 20 and the inner and outer diameters of the annular convex portion 13 .

[0066] Preferably, the forming coefficient K 1 The value is between 2 and 4.

[0067] It is worth noting that the integrated collector 1 can optimize the aerodynamic performance in part because the integrated collector 1 can convert the airflow flowing toward the center of the volute (i.e., toward the rotation center of the impeller 3) into an airflow consistent with the rotation direction of the impeller 3, so as to reduce the energy loss caused by the return of the airflow. Based on the above principle, the inlet angle θ of the guide groove 200 in the integrated collector 1 is 1 should be as close to 0° as possible, and the outlet angle θ of the guide groove 200 2 It should be as close to 90° as possible. It is understood that the inlet angle θ mentioned in this application is 1 The outlet angle θ refers to the angle between the tangent line of the structural arc of the guide groove 200 at the inlet and the outer circle normal line of the annular protrusion 13; the outlet angle θ mentioned in this application 2 It refers to the angle between the tangent line of the structural arc of the guide groove 200 at the outlet and the normal line of the inner circle of the annular protrusion 13.

[0068] However, since the guide groove 200 is at an inlet angle θ 1 Too small, and / or the outlet angle θ 2When the inlet angle θ is too large, the undercut phenomenon is likely to occur. Therefore, the integrated collector 1 of the present application needs to ensure that the undercut problem does not occur in the guide groove 200, while making the inlet angle θ 1 As small as possible, and the outlet angle θ 2 As big as possible.

[0069] For example, Figure 8 As shown, the center of the circle corresponding to the structural arc CD of the guide groove 200 is point B, and the corresponding radius is R 1 ; The center of the air inlet circle 10 is A; then Figure 4 It is easy to know: when the relationship is satisfied In order to make the inlet angle θ 1 As small as possible, and the outlet angle θ 2 As large as possible, the integrated current collector 1 of the present application selects the extreme case, that is, the guide groove 200 of the integrated current collector 1 satisfies the following relationship (1):

[0070]

[0071] Where: L AB R is the straight-line distance between the center B of the structural arc of the guide groove 200 and the center A of the air inlet ring 10; 1 is the radius of the structural arc of the guide groove 200; Δd 2 D is the convex hull distance of the integrated current collector 1; bn is the inner diameter of the convex hull 20; θ 1 is the inlet angle of the guide groove 200; θ 2 is the outlet angle of the guide groove 200.

[0072] Then in △ABC and △ABD, the cosine theorem easily yields:

[0073]

[0074] Simplified, we can get the following relationship (2):

[0075] D by 2 +4·D by ·R 1 ·sin(θ 1 )=D bn 2 +4·D bn ·R 1 ·sin(θ 2 )=D bn 2 +4·D bn ·R 1 ·cos(θ 1) (2);

[0076]

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

[0078]

[0079] 4.R 1 (D bn -Δd 2 -D bn cos(θ 1 ))+Δd 2 2 -2D bn ·θd 2 =0 (5)

[0080] By integrating the above equations (4) and (5), it can be obtained that the integrated current collector 1 satisfies the equation:

[0081]

[0082] Where: D by D is the outer diameter of the convex hull 20; bn is the inner diameter of the convex hull 20; θ 1 is the inlet angle of the guide groove 200; Δd 2 is the convex hull spacing of the integrated current collector 1.

[0083] It is worth noting that after the preliminary design of the integrated current collector 1, except for the inlet angle θ 1 Except for the unknown, the other parameters are constants. Substituting the parameters into the inlet angle θ can be obtained. 1 For example, the outer diameter D of the convex hull of the integrated current collector 1 is by 300mm, convex hull inner diameter D bn is 250mm, diameter difference Δd 1 Take 3mm, forming coefficient K 1 is 4; then the convex hull spacing Δd of the integrated current collector 1 2 is 12mm; Substituting into the above relationship, we can get:

[0084]

[0085] After sorting, we can get: 41685cos(θ 1 )-8784sin(θ 1 ) = 32725;

[0086] Solving for this, we can obtain: cos(θ 1)≈0.885; sin(θ 1 )≈0.465.

[0087] Then, the inlet angle θ of the guide groove 200 is 1 The outlet angle θ of the guide groove 200 is about 27.1°; 2 =90°-θ 1 , about 62.9°.

[0088] Preferably, the inlet angle θ of the guide groove 200 is 1 The outlet angle θ of the guide groove 200 can be rounded up to 30°. 2 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 guided airflow and cross-flow according to the flow path of the airflow, wherein the guided airflow refers to the airflow flowing along the extension direction of the guide groove 200 of the integrated collector 1, and the cross-flow refers to the airflow entering the volute 2 along the radial direction. Therefore, when the number of the convex humps 20 is small, the cross-flow airflow passes through only one guide groove 200 at most; and when the number of the convex humps 20 is large, the cross-flow airflow may pass through multiple guide grooves 200. Generally speaking, the cross-flow airflow passing through multiple guide grooves 200 will have an adverse effect on the aerodynamic performance, so the present application needs to reasonably design the number of the convex humps 20 to avoid the cross-flow airflow passing through multiple guide grooves.

[0090] For example, Figure 8 and Fig. 9 As shown, A is the center of the air inlet ring 10, B is the center of the structural arc of the guide groove 200, E is the intersection between the outer groove 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 between the inner groove 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. Then, the convex hull spacing Δd of the integrated collector 1 is 2 The outer diameter D of the convex hull 20 by The inner diameter D of the convex hull 20 bn The inlet angle θ of the guide groove 200 1 The outlet angle θ of the guide groove 200 2 After being 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 △ABF and △ABE, the following relationship can be easily obtained by the cosine theorem:

[0093]

[0094] After finishing, we can get:

[0095]

[0096] It is worth noting that since the central angle ∠EAF corresponding to each guide groove 200 in the integrated collector 1 of the present application is ∠EAB-∠FAB, in order to avoid the airflow passing through multiple guide grooves 200, n×∠EAF≤360° should be satisfied, where n is the number of the guide grooves 200. It can be understood that in the integrated collector 1 of the present application, the number of the convex hulls 20 is the same as that of the guide grooves 200.

[0097] In addition, the present application may define the occupancy angle coefficient K of the guide groove 200 as 2 Satisfies the relationship:

[0098]

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

[0100] Optionally, the occupancy angle coefficient K of the guide groove 200 is 2 It usually takes a value between 0.6 and 1.

[0101] Preferably, the occupancy angle coefficient K of the guide groove 200 is 2 The value is selected between 0.7 and 0.9 so as to ensure the airflow pre-swirl effect while avoiding the airflow from crossing through multiple guide grooves 200 .

[0102] For example, when the outer diameter D of the convex hull of the integrated current collector 1 is by 300mm, convex hull inner diameter D bn 250mm, convex hull spacing Δd 2 The inlet angle θ of the guide groove 200 is 12 mm; 1 The outlet angle θ of the guide groove 200 is 30°; 2 is 60°; then substituting into the relationship we get:

[0103]

[0104]

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

[0106] Then substitute ∠EAF=19.82° into the relationship We can get:

[0107]

[0108] The final solution is: 12.7≤n≤16.3.

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

[0110] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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 only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. An integrated collector is used to be arranged at the air inlet of the volute, characterized in that: include: Air inlet ring; and A plurality of convex humps, wherein the convex humps are integrally formed on the air inlet ring, and the plurality of convex humps 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 humps.

2. The integrated current collector according to claim 1, characterized in that: The air inlet ring includes an annular outer ring portion for fixedly connecting with the volute, an annular inner ring portion for extending backward into the volute, and an annular convex portion extending forwardly from the annular outer ring portion to the annular inner ring portion; the annular convex portion is intermittently pressed backward to form the guide groove that is recessed backward, so that the unpressed portion of the annular convex portion provides the convex bump.

3. The integrated current collector according to claim 1, characterized in that: The air inlet ring includes an annular outer ring portion for fixedly connecting with the volute, an annular inner ring portion for extending backward into the volute, and an annular convex portion extending forwardly from the annular outer ring portion to the annular inner ring portion; the annular convex portion is intermittently pressed forward to form the convex bump protruding forward, so that the unpressed portion of the annular convex portion provides the guide groove.

4. The integrated current collector according to claim 2 or 3, characterized in that: The guide groove extends from the annular outer ring portion to the annular inner ring portion in a curved manner to form an arc-shaped pressed groove.

5. The integrated current collector according to claim 2 or 3, characterized in that: The annular convex portion satisfies the 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 is the outer diameter of the impeller in the volute; D yn is the inner diameter of the impeller in the volute.

6. The integrated current collector according to claim 3, characterized in that: The diameter differences between the inner and outer diameters of the convex hull and the inner and outer diameters of the annular convex portion are both between 1 mm and 10 mm.

7. The integrated current collector according to claim 2 or 3, characterized in that: The integrated current collector satisfies the relationship: Where: D by is the outer diameter of the convex hull; D bn is the inner diameter of the convex hull; θ1 is the inlet angle of the guide groove; Δd2 is the convex hull spacing of the integrated current collector.

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

9. The integrated current collector according to any one of claims 1 to 3, characterized in that: The occupancy angle coefficient K2 of the guide groove satisfies the relationship: Wherein: n is the number of the guide grooves; ∠EAF is the central angle of the guide groove.

10. A fan, characterized in that: include: snail shell; an impeller rotatably disposed on the volute; as well as The integrated collector according to any one of claims 1 to 9, wherein the integrated collector is arranged at the air inlet of the volute.

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