Integrated current collector and fan

Abstract

The invention relates to an integrated current collector and a fan, which can enhance the air flow prewhirl effect and improve the aerodynamic performance while ensuring integrated processing. The integrated current collector is used for being arranged at an air inlet of a volute and comprises an air inlet ring used for being fixedly arranged on the volute; the air inlet ring is provided with a windward side and a windward side, the trapezoid convex hulls are integrally formed on the air inlet ring, the trapezoid convex hulls are arranged in the circumferential direction of the air inlet ring at intervals, a flow guide groove used for guiding air flow to pre-swirl is formed between any two adjacent trapezoid convex hulls, and a trapezoid flow guide face is provided through the windward side of each trapezoid convex hull.

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 enhance the airflow pre-rotation effect and improve the aerodynamic performance while ensuring integrated processing.

[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] An air inlet ring, used to be fixed to the volute; and

[0008] A plurality of trapezoidal convex humps, wherein the trapezoidal convex humps are integrally formed on the air inlet ring, and the plurality of trapezoidal convex humps are arranged at intervals along the circumference of the air inlet ring to form a guide groove for guiding the pre-swirl of the air flow between any two adjacent trapezoidal convex humps, and a trapezoidal guide surface is provided through the windward surface of the trapezoidal convex humps.

[0009] According to one embodiment of the present application, the air inlet ring has an annular outer ring area for fixedly connecting with the volute, an annular inner ring area for extending backward into the volute, and an annular pressed area extending inward from the annular outer ring area to the annular inner ring area; the annular pressed area is intermittently pressed to form the trapezoidal convex bulge and the guide groove with alternating convex and concave shapes.

[0010] According to one embodiment of the present application, the trapezoidal guide surface of the trapezoidal convex hull has a bottom edge flush with the annular outer ring area, a top edge parallel to the annular outer ring area and shorter than the bottom edge, and a pair of waist edges asymptotically extending from the bottom edge to the top edge; the waist angle of the trapezoidal guide surface is between 40° and 70°.

[0011] According to one embodiment of the present application, a first transition fillet is provided at the connection between the trapezoidal convex hull and the annular outer ring area, and the radius R of the first transition fillet is 1 Satisfy the relationship: 0.2×Δd 1 ≤R 1 ≤0.8×Δd 1 ; In the formula, Δd 1 is the profiling depth of the annular profiling area.

[0012] According to one embodiment of the present application, the trapezoidal convex hull is provided with a second transition fillet at the connection between the waist edge and the top edge; the radius of the second transition fillet is equal to the radius of the first transition fillet.

[0013] According to an embodiment of the present application, the trapezoidal guide surface of the trapezoidal convex hull extends obliquely relative to the annular outer ring area, and the taper of the trapezoidal guide surface is between 5° and 45°.

[0014] According to one embodiment of the present application, the inlet width of the guide groove is greater than the outlet width of the guide groove, so as to provide a trumpet-shaped flow channel between two adjacent trapezoidal convex hulls.

[0015] According to one embodiment of the present application, the outlet width of the guide groove is between one and six times the profiling depth; the ratio between the inlet width of the guide groove and the outlet width of the guide groove is between 1.25 and 3.

[0016] According to one embodiment of the present application, the integrated collector further includes a plurality of arc-shaped bulges integrally formed on the air inlet ring and having a height smaller than the trapezoidal bulge; wherein the arc-shaped bulge is located within the guide groove and arranged adjacent to the leeward side of the trapezoidal bulge.

[0017] According to one embodiment of the present application, the arc-shaped convex hull extends circumferentially from the leeward surface of the trapezoidal convex hull toward the windward surface of another trapezoidal convex hull, and a gap is left between the leeward surface of the arc-shaped convex hull and the windward surface of the trapezoidal convex hull.

[0018] According to an embodiment of the present application, the top surface of the trapezoidal convex hull extends gradually from the outside to the inside; the ratio of the width of the narrowest part of the circumference of the trapezoidal convex hull to the embossing depth is between 0.5 and 4.

[0019] According to another aspect of the present application, the present application further provides a wind turbine, comprising:

[0020] snail shell;

[0021] an impeller rotatably disposed on the volute; and

[0022] Any of the above-mentioned integrated collectors, wherein the integrated collector is arranged at the air inlet of the volute.

[0023] To sum up, on the one hand, since the trapezoidal bulge and the air inlet ring are integrally formed, such as by sheet metal pressing, the integrated collector does not need to undergo complicated assembly processing like traditional sheet-like guide structures, which helps to reduce costs while improving aerodynamic performance; on the other hand, since the windward surface of the trapezoidal bulge is implemented as a trapezoidal guide surface, compared to the arc-shaped bulge (whose effective guide area is the area of ​​the arc-shaped guide surface), the trapezoidal bulge of the present application will have an increased effective guide area when the pressing depth Δd1 remains unchanged, thereby enhancing the guiding effect of the integrated collector of the present application on the airflow and improving the aerodynamic performance of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A three-dimensional schematic diagram of a fan according to an embodiment of the present application;

[0025] Figure 2 A first example of an integrated current collector in a wind turbine according to the above embodiment of the present application is shown;

[0026] Figure 3 A schematic front view of the integrated current collector of the first example of the present application is shown;

[0027] Figure 4 Shows Figure 3 AA cross-sectional schematic diagram of the integrated current collector shown;

[0028] Figure 5 Shows Figure 3 The BB cross-sectional view of the integrated current collector shown;

[0029] Figure 6 A second example of the integrated current collector in the wind turbine of the above embodiment of the present application is shown;

[0030] Figure 7 A third example of the integrated current collector in the wind turbine according to the above embodiment of the present application is shown.

[0031] Description of main component symbols:

[0032] 1. Integrated collector; 10. Air inlet ring; 100. Guide groove; 11. Annular outer ring area; 12. Annular inner ring area; 13. Annular pressed area; 20. Trapezoidal convex hull; 200. Trapezoidal guide surface; 201. Bottom edge; 202. Top edge; 203. Waist edge; 204. First transition fillet; 205. Second transition fillet; 30. Arc-shaped convex hull; 2. Volute; 3. Impeller.

[0033] 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

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] Considering that the existing sheet-like 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 guide structures are, the more difficult the processing and assembly will be, and the higher the cost will be. The applicant has designed an integrated collector, which can combine the collector structure with the arc-shaped guide structure, and process and form them as a whole, which is conducive to reducing manufacturing costs. However, due to the limit of plastic deformation of the material, the profiling of this arc-shaped guide structure cannot be made too deep (for example, taking a galvanized sheet with a thickness of 0.7mm as an example, the profiling depth is usually required to be less than or equal to 8mm), which greatly limits the guiding effect of the guide structure on the airflow, resulting in the collector's optimization effect on aerodynamic performance is not significant. Based on this, the present application provides an integrated collector and fan, which can enhance the airflow pre-swirl effect and improve aerodynamic performance while ensuring integrated processing.

[0040] Specifically, refer to the attached Figure 1 As shown, an 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 enhance the airflow pre-swirl effect and improve the aerodynamic performance through the integrated collector 1. It is understandable 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.

[0041] More specifically, if Figures 2 to 7As shown, the integrated collector 1 may include an air inlet ring 10 for being fixed to the volute 2 and a plurality of trapezoidal convex bumps 20 integrally formed on the air inlet ring 10; wherein the plurality of trapezoidal convex bumps 20 are arranged at intervals along the circumference of the air inlet ring 10 to form a guide groove 100 for guiding the pre-swirl of the air flow between any two adjacent trapezoidal convex bumps 20, and the windward surface of the trapezoidal convex bump 20 provides a trapezoidal guide surface 200. 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 100 of the integrated collector 1 under the action of the negative pressure to cause pre-swirl, and then flows into the volute 2, which helps to improve the aerodynamic performance.

[0042] It is worth noting that, on the one hand, since the trapezoidal convex hull 20 and the air inlet ring 10 are integrally formed, such as by sheet metal pressing, the integrated collector 1 does not need to be assembled and processed as complicatedly as the traditional sheet-like guide structure, which helps to improve the aerodynamic performance while reducing costs; on the other hand, since the windward surface of the trapezoidal convex hull 20 is implemented as a trapezoidal guide surface 200, compared with the arc-shaped convex hull (whose effective guide area is the area of ​​the arc-shaped guide surface), the trapezoidal convex hull 20 of the present application has a press depth Δd 1 Under the condition that the effective flow guide area (i.e., the area of ​​the trapezoidal flow guide surface 200) remains unchanged, the effective flow guide area (i.e., the area of ​​the trapezoidal flow guide surface 200) will increase, so that the integrated collector 1 of the present application can enhance the guiding effect of the airflow, thereby improving the aerodynamic performance of the fan. It can be understood that since the airflow mainly changes its flow direction under the guidance of the windward surface of the convex hull to form a tangential pre-swirl airflow, the integrated collector 1 of the present application can enhance the guiding effect of the collector on the airflow by increasing the effective flow guide area of ​​the windward surface, so as to improve the aerodynamic performance.

[0043] For example, in the first example of the present application, Figures 2 to 5 As shown, the air inlet ring 10 may have an annular outer ring area 11 for fixedly connecting with the volute 2, an annular inner ring area 12 for extending backward into the volute 2, and an annular pressed area 13 extending inward from the annular outer ring area 11 to the annular inner ring area 12; the annular pressed area 13 is intermittently pressed to form the trapezoidal convex bulge 20 and the guide groove 100 with convex and concave alternations. 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.

[0044] Optionally, in the above first example of the present application, if Figure 2 and Figure 4As shown, the trapezoidal guide surface 200 of the trapezoidal convex bulge 20 has a bottom edge 201 flush with the annular outer ring area 11, a top edge 202 parallel to the annular outer ring area 11 and shorter than the bottom edge 201, and a pair of waist edges 203 extending asymptotically from the bottom edge 201 to the top edge 202, so that the external airflow can be obliquely turned along the waist edges 203 when passing over the trapezoidal convex bulge 20, which is beneficial to reducing airflow resistance.

[0045] Optionally, the trapezoidal guide surface 200 is implemented as an isosceles trapezoid, so that the lengths of the two waist edges 203 are the same. It is understandable that in other examples of the present application, the lengths of the two waist edges 203 of the trapezoidal guide surface 200 may also be different, which will not be described in detail in the present application.

[0046] It is worth noting that although the waist angle θ of the trapezoidal guide surface 200 1 The larger the angle (i.e., the included angle between the waist edge 203 and the bottom edge 201), the larger the effective flow conduction area of ​​the trapezoidal convex hull 20 is. However, in order to reduce the influence of the trapezoidal convex hull 20 on the flow function of the current collector itself, as shown in FIG. Figure 3 and Figure 4 As shown, the waist angle θ of the trapezoidal guide surface 200 in this application is 1 The value is usually between 40° and 70°.

[0047] Preferably, the waist angle θ of the trapezoidal guide surface 200 is 1 The value is between 45° and 65°.

[0048] In addition, in order to further reduce the influence of the trapezoidal convex hull 20 on the flow function of the current collector itself, as shown in FIG. Figure 2 and Figure 4 As shown, the connection between the trapezoidal convex hull 20 and the annular outer ring area 11 is provided with a first transition fillet 204, and the radius R of the first transition fillet 204 is 1 Satisfy the relationship: 0.2×Δd 1 ≤R 1 ≤0.8×Δd 1 ; In the formula, Δd 1 is the profiling depth of the annular profiling area 13.

[0049] Preferably, the radius R of the first transition fillet 204 is 1 Satisfy the relationship: 0.3×Δd 1 ≤R 1 ≤0.6×Δd 1 .

[0050] Furthermore, if Figure 2 and Figure 4As shown, the trapezoidal convex hull 20 is provided with a second transition fillet 205 at the connection between the waist edge 203 and the top edge 202. Preferably, the radius R of the second transition fillet 205 is 2 Equal to the radius R of the first transition fillet 204 1 .

[0051] According to the above first example of the present application, Figure 3 and Figure 5 As shown, the trapezoidal guide surface 200 of the trapezoidal convex hull 20 extends obliquely relative to the annular outer ring area 11, and the taper θ of the trapezoidal guide surface 200 is 2 The value is between 5° and 45°, so that the deformation of the annular pressed area 13 at the trapezoidal guide surface 200 is alleviated and can withstand deeper stretching, so that while ensuring the guide effect, the pressing depth of the annular pressed area 13 is increased, thereby increasing the effective guide area of ​​the trapezoidal convex hull 20. It can be understood that the taper θ mentioned in this application is 2 It refers to the angle between the trapezoidal guide surface 200 and the perpendicular line of the annular outer ring area 11 (ie, the central axis of the air inlet ring 10 ).

[0052] Preferably, the taper θ of the trapezoidal guide surface 200 is 2 The value is between 15° and 30°.

[0053] Optionally, the leeward side of the trapezoidal convex bulge 20 extends obliquely relative to the annular outer ring area 11, and the taper of the leeward side is between 5° and 45°, so that the windward side and the leeward side of the trapezoidal convex bulge 20 extend asymptotically from the bottom edge 201 to the top edge 202, so that the deformation of the annular pressed area 13 at each guide surface of the trapezoidal convex bulge 20 is alleviated so as to withstand deeper stretching.

[0054] It is worth noting that the profile depth Δd is 1 The limit profiling depth of the annular profiling area 13 of the present application can be increased to about For example, after adding a 30° taper, the ultimate profiling depth of a 0.7mm thick galvanized sheet can be implemented as That is, the ultimate profiling depth of galvanized sheet with a thickness of 0.7 mm can be increased from 8 mm to 9.2 mm.

[0055] In addition, the national standard GBT17713-2022 (range hood and cooking smoke suction and exhaust device thereof) is used as the test standard, and the arc-shaped convex hull collector and the trapezoidal convex hull collector with a taper in the first example of the present application are tested at a maximum air volume of 15m 3 / min and the working air volume is 12m 3Noise tests were carried out under the conditions of 100 rpm and 200 rpm, and it was found that compared with the arc-shaped convex hull collector, the semi-anechoic chamber noise and working noise of the integrated collector 1 in the above-mentioned first example of the present application were reduced by about 0.3 dB, which significantly improved the aerodynamic performance of the fan.

[0056] In addition, although in the first example of the present application, the inlet width and outlet width of the guide groove 100 are equal to provide parallel flow channels; in other examples of the present application, the integrated collector 1 can further improve the aerodynamic performance by improving the flow channel shape. Figure 6 A second example of the integrated collector 1 according to the above embodiment of the present application is shown, which improves the shape of the flow channel between the trapezoidal convex bumps 20 into a trumpet shape, so that more airflow flows through the guide groove 100, thereby enhancing the guiding effect of the collector on the pre-swirl of the airflow.

[0057] Specifically, compared with the above-mentioned 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 As shown, the inlet width L of the guide groove 100 is k Greater than the outlet width L of the guide groove 100 z , so as to provide a trumpet-shaped flow channel between two adjacent trapezoidal convex bumps 20, so that the air flowing through the integrated collector 1 can pass more through the guide groove 100, thereby strengthening the guiding effect of the integrated collector 1 on the pre-swirl of the airflow. It can be understood that the inlet width L mentioned in this application is k Refers to the circumferential width of the opening on the guide groove 100 corresponding to the annular outer ring area 11; the outlet width L mentioned in this application z It refers to the circumferential width of the opening on the guide groove 100 corresponding to the annular inner ring area 12.

[0058] In other words, in the second example of the present application, the guide groove 100 gradually extends from the annular outer ring area 11 to the annular inner ring area 12 to form a trumpet-shaped flow channel, so that more airflow passes through the guide groove 100, so as to better enhance the airflow pre-rotation effect and improve the aerodynamic performance of the fan.

[0059] Alternatively, if Figure 6 As shown, the outlet width L of the guide groove 100 is z Usually, the embossing depth Δd of the annular embossing area 13 is 1 The value is between one and six times, that is: Δd 1 ≤L z ≤6×Δd 1 .

[0060] Preferably, the outlet width L of the guide groove 100 is zAt the profile depth Δd 1 The value is between two and four times, that is: 2×Δd 1 ≤L z ≤4×Δd 1 .

[0061] Alternatively, if Figure 6 As shown, the inlet width L of the guide groove 100 is k The outlet width L of the guide groove 100 z The ratio between them is usually between 1.25 and 3, that is: 1.25×L z ≤L k ≤3×L z .

[0062] Preferably, the inlet width L of the guide groove 100 is k The outlet width L of the guide groove 100 z The ratio between them is between 1.5 and 2, that is: 1.5×L z ≤L k ≤2×L z .

[0063] It is worth noting that, based on the national standard GBT17713-2022 (range hoods and cooking fume suction and exhaust devices thereof), the trapezoidal convex hull collector with a trumpet-shaped flow channel in the second example of the present application is tested at a maximum air volume of 15m 3 / min and the working air volume is 12m 3 Noise tests were carried out under the conditions of 0.1 dB / min and 0.2 dB / min, respectively, and it can be seen that compared with the integrated collector according to the first example of the present application, the semi-anechoic chamber noise and working noise of the integrated collector 1 in the second example of the present application were reduced by about 0.1 dB to 0.2 dB, further improving the aerodynamic performance of the fan.

[0064] In addition, 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 100 of the integrated collector 1, and the cross-flow refers to the airflow entering the volute 2 along the radial direction. Although the higher trapezoidal convex hull 20 can enhance the pre-swirl effect of the guided airflow, the higher trapezoidal convex hull 20 may also be an obstacle to the cross-flow, which is easy to cause flow loss.

[0065] Through experiments, it is observed that since the leeward side of the trapezoidal convex hull 20 has a weaker guiding effect on the airflow, it does not need to be as large as the windward side; therefore, the leeward side of the trapezoidal convex hull 20 can be designed as a surface with a lower height, which is closer to the streamlined structure of the traditional collector. Figure 7A third example of the integrated current collector 1 according to the above embodiment of the present application is shown, which adopts a combination of high and low convex hulls to further improve the aerodynamic performance.

[0066] Specifically, compared with the above-mentioned first example of the present application, the difference of the integrated current collector 1 according to the third example of the present application is that: Figure 7 As shown, the integrated collector 1 can further include a plurality of arc-shaped bulges 30 integrally formed on the air inlet ring 10 and having a height less than the trapezoidal bulge 20, wherein the arc-shaped bulge 30 is located within the guide groove 100 and arranged adjacent to the leeward side of the trapezoidal bulge 20, so as to form a composite bulge collector by utilizing a combination of arc-shaped short bulges and trapezoidal high bulges, thereby further improving the aerodynamic performance of the collector.

[0067] More specifically, if Figure 7 As shown, the arcuate convex bulge 30 extends circumferentially from the leeward side of the trapezoidal convex bulge 20 toward the windward side of another trapezoidal convex bulge 20, and a gap is left between the leeward side of the arcuate convex bulge 30 and the windward side of the trapezoidal convex bulge 20, so that the windward side of each trapezoidal convex bulge 20 completely retains the original trapezoidal guide surface 200 to provide a larger effective guide area; at the same time, the leeward side of each trapezoidal convex bulge 20 is reduced in height under the action of the arcuate convex bulge 30, reducing the obstruction to the crossing airflow and reducing airflow loss. In other words, the depth of the guide groove 100 near the windward side of the trapezoidal convex bulge 20 is greater than the depth of the guide groove 100 near the leeward side of the trapezoidal convex bulge 20, so as to enhance the guiding effect of the windward side of the trapezoidal convex bulge 20 on the pre-rotation of the airflow, and at the same time, it can also reduce the obstruction caused by the trapezoidal convex bulge 20 to the crossing airflow, which is conducive to further improving the aerodynamic performance of the collector.

[0068] Alternatively, if Figure 7 As shown, the top surface of the trapezoidal bulge 20 extends gradually from the outside to the inside, so that the narrowest circumferential part of the trapezoidal bulge 20 is located on the top surface of the trapezoidal bulge 20 close to the annular outer ring area 11, so as to further reduce the obstruction to the crossing airflow, which is beneficial to further reduce the airflow loss and further improve the aerodynamic performance.

[0069] Alternatively, if Figure 7 As shown, the width L of the narrowest part of the trapezoidal convex hull 20 in the circumferential direction is min Usually designed to be within the profile depth Δd 1 The value is between 0.5 and 4 times, that is: 0.5×Δd 1 ≤L min ≤4×Δd 1 .

[0070] Preferably, the width L of the narrowest part of the trapezoidal convex hull 20 in the circumferential direction is minand profile depth Δd 1 The ratio between them is between 1 and 2, that is: Δd 1 ≤L min ≤2×Δd 1 .

[0071] It is worth noting that, based on the national standard GBT17713-2022 (range hood and cooking fume suction and exhaust device thereof), the composite convex hull collector in the third example of the present application is tested at a maximum air volume of 15m 3 / min and the working air volume is 12m 3 Noise tests were carried out under the conditions of 0.1477 W / m2 and 0.127 W / m2. It can be seen that compared with the integrated collector according to the above-mentioned first example of the present application, the semi-anechoic chamber noise and working noise of the integrated collector 1 in the above-mentioned third example of the present application are reduced by about 0.2dB to 0.3dB, further improving the aerodynamic performance of the fan.

[0072] 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.

[0073] 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: An air inlet ring, used to be fixed to the volute; and A plurality of trapezoidal convex humps, wherein the trapezoidal convex humps are integrally formed on the air inlet ring, and the plurality of trapezoidal convex humps are arranged at intervals along the circumference of the air inlet ring to form a guide groove for guiding the pre-swirl of the air flow between any two adjacent trapezoidal convex humps, and a trapezoidal guide surface is provided through the windward surface of the trapezoidal convex humps.

2. The integrated current collector according to claim 1, characterized in that: The air inlet ring has an annular outer ring area for fixedly connecting with the volute, an annular inner ring area for extending backward into the volute, and an annular pressed area extending inward from the annular outer ring area to the annular inner ring area; the annular pressed area is intermittently pressed to form the trapezoidal convex bulge and the guide groove with convex and concave alternating shapes.

3. The integrated current collector according to claim 2, characterized in that: The trapezoidal guide surface of the trapezoidal convex hull has a bottom edge flush with the annular outer ring area, a top edge parallel to the annular outer ring area and shorter than the bottom edge, and a pair of waist edges asymptotically extending from the bottom edge to the top edge; the waist angle of the trapezoidal guide surface is between 40° and 70°.

4. The integrated current collector according to claim 3, characterized in that: A first transition fillet is provided at the connection between the trapezoidal convex hull and the annular outer ring area, and the radius R1 of the first transition fillet satisfies the relationship: 0.2×Δd1≤R1≤0.8×Δd1; wherein Δd1 is the profiling depth of the annular profiling area.

5. The integrated current collector according to claim 4, characterized in that: The trapezoidal convex hull is provided with a second transition fillet at the connection between the waist edge and the top edge; the radius of the second transition fillet is equal to the radius of the first transition fillet.

6. The integrated current collector according to claim 2, characterized in that: The trapezoidal flow guiding surface of the trapezoidal convex hull extends obliquely relative to the annular outer ring area, and the taper of the trapezoidal flow guiding surface is between 5° and 45°.

7. The integrated current collector according to any one of claims 1 to 6, characterized in that: The inlet width of the guide groove concave is greater than the outlet width of the guide groove, so as to provide a trumpet-shaped flow channel between two adjacent trapezoidal convex hulls.

8. The integrated current collector according to claim 7, characterized in that: The outlet width of the guide groove is between one and six times the profiling depth; the ratio between the inlet width of the guide groove and the outlet width of the guide groove is between 1.25 and 3.

9. The integrated current collector according to any one of claims 1 to 6, characterized in that: The integrated collector further includes a plurality of arc-shaped convex humps integrally formed on the air inlet ring and having a height smaller than that of the trapezoidal convex humps; wherein the arc-shaped convex humps are located within the guide groove and arranged adjacent to the leeward side of the trapezoidal convex humps.

10. The integrated current collector according to claim 9, characterized in that: The arc-shaped convex hull extends circumferentially from the back-surface surface of the trapezoidal convex hull toward the windward surface of another trapezoidal convex hull, and a gap is left between the leeward surface of the arc-shaped convex hull and the windward surface of the trapezoidal convex hull.

11. The integrated current collector according to claim 10, characterized in that: The top surface of the trapezoidal convex hull extends gradually from the outside to the inside; the ratio of the width of the narrowest part of the circumference of the trapezoidal convex hull to the pressing depth is between 0.5 and 4.

12. 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 11, wherein the integrated collector is arranged at the air inlet of the volute.

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