Current collector and extractor hood

Abstract

The present application relates to a kind of current collectors and range hood.The current collector, for installing fan, comprising: annular mounting portion;First air guide portion, first air guide portion includes first air guide bevel segment and first air guide arc segment;And second air guide portion, second air guide portion is connected to first air guide portion, second air guide portion includes second air guide bevel segment and second air guide arc segment, the central angle α1 of second air guide portion is less than 90 °, by controlling the air inlet radius of second air guide arc segment is less than the air inlet radius of first air guide arc segment, and the air guide height of second air guide arc segment is controlled to be greater than the air guide height of first air guide arc segment, make second air guide arc segment can provide greater turning radius, to effectively enhance the air guide effect of second air guide arc segment to airflow, not only can improve the leakage backflow at the air inlet of fan, better guide airflow into the volute of fan, also can improve the turbulence intensity in the volute of fan, to improve the efficiency of fan, reduce noise.

Description

Technical Field

[0001] This invention relates to the field of range hood technology, and in particular to a collector and a range hood. Background Technology

[0002] Currently, most range hoods use a multi-blade centrifugal fan system as their core power system. By using a collector before the fan system inlet to guide the airflow into the fan system to do work before exhausting it, the problem of backflow caused by the back pressure of the common flue can be reduced.

[0003] The multi-blade centrifugal fans used in range hoods are radial flow fans, mostly installed inside a casing. Unlike axial flow fans, they don't provide 360° airflow circulation; instead, the airflow needs to be redirected from axial to radial. Due to the complex operating environment of range hoods, influenced by factors such as the resistance of the flue pipes, shared flue gas ducts, and back pressure, they typically use collectors to guide air. Ordinary collectors usually employ a uniform longitudinal section design, ensuring a consistent air intake radius and evenly guiding gas into the fan. However, using collectors that provide uniform airflow can easily lead to severe gas leakage, causing unstable airflow at the fan's volute side inlet. Furthermore, vortices at the inlet and secondary airflow within the volute can increase noise levels, resulting in lower overall system efficiency. Summary of the Invention

[0004] Therefore, it is necessary to provide a collector and a range hood to address the problems of unstable airflow and serious gas leakage in the inlet of existing range hoods.

[0005] A collector for installation on a fan, comprising:

[0006] Circular mounting section;

[0007] A first air guide section, comprising a first obliquely shaped air guide section extending obliquely from the inner ring of the annular mounting portion toward the air inlet side of the collector, and a first curved air guide section extending curvedly from the first obliquely shaped air guide section toward the air outlet side of the collector; and

[0008] The second air guide section is connected to the first air guide section. The second air guide section includes a second obliquely shaped air guide section extending obliquely from the inner ring of the annular mounting section toward the air inlet side of the collector, and a second curved air guide section extending curvedly from the second obliquely shaped air guide section toward the air outlet side of the collector. The central angle α1 of the second air guide section is less than 90°. The air inlet radius of the second curved air guide section is less than the air inlet radius of the first curved air guide section and the axis of the collector, and the air guide height of the second curved air guide section is greater than the air guide height of the first curved air guide section.

[0009] In some embodiments, the air inlet radius of the second air-guiding arc segment has a tendency to first decrease and then increase, and the first air-guiding arc segment and the second air-guiding arc segment satisfy the following relationship:

[0010] 0.85×R1≤R n ≤0.95×R1;

[0011] Wherein, R1 is the air inlet radius of the first guide arc section; R n The air inlet radius is the second air guide arc segment.

[0012] In some embodiments, the air inlet radius of the first guide arc segment satisfies the following relationship:

[0013] R1 = Rt; and

[0014] 5mm≤t≤20mm;

[0015] Wherein, R1 is the air inlet radius of the first air guide arc section, R is the inner radius of the impeller of the fan used to assemble the collector, and t is the clearance of the impeller of the fan.

[0016] In some embodiments, the inner diameter of the annular mounting portion satisfies the following relationship:

[0017] 1.1×R1≤R a ≤1.5×R1;

[0018] Wherein, R1 is the air inlet radius of the first guide arc section; R a The inner diameter of the annular mounting portion.

[0019] In some embodiments, the air guiding height of the first air guiding arc segment and the air guiding height of the second air guiding arc segment satisfy the following relationship:

[0020] H 11 ≤H n1 ≤1.5×H 11 ;

[0021] Among them, H 11 H is the air guiding height of the first air guiding arc segment. n1 The guide height is the second guide arc segment.

[0022] In some embodiments, the air guiding height H of the first air guiding arc segment 11 The range is from 5mm to 15mm.

[0023] In some embodiments, the first air guide portion further includes a first air guide extension portion extending from the first air guide arc segment along the tangential direction of the first air guide arc segment, and the second air guide portion further includes a second air guide extension portion extending from the second air guide arc segment along the tangential direction of the second air guide arc segment.

[0024] In some embodiments, the length L1 of the first air guide extension section ranges from 0 mm to 6 mm; the length L of the second air guide extension section... n The range is from 0mm to 6mm.

[0025] In some embodiments, the angle ω1 between the first air guide extension and the annular mounting portion ranges from 90° to 110°; the angle ω1 between the second air guide extension and the annular mounting portion... n The range is from 90° to 110°.

[0026] In some embodiments, the first air guide extension and the second air guide extension satisfy the following relationship:

[0027] 5mm≤H 12 =H n2 ≤20mm;

[0028] Among them, H 12 H is the depth of the first air guide extension section. n2 This refers to the depth of the second air guide extension section.

[0029] In some embodiments, the collector has four bracket mounting slots, which are respectively and spaced apart in the first air guide and the second air guide, and are used to fix the motor brackets respectively.

[0030] A range hood, comprising:

[0031] The main body of the range hood has its air inlet facing downwards.

[0032] A fan is installed on the main body of the range hood, with the air inlet of the fan facing the front of the main body of the range hood and the air outlet of the fan facing the top of the main body of the range hood.

[0033] As described above, the collector is installed at the air inlet of the fan, and the second air guide arc section of the collector is located on the side away from the air inlet of the range hood body and away from the air outlet of the fan.

[0034] The collector of this application controls the air inlet radius of the second air guide arc section to be smaller than that of the first air guide arc section, and controls the air guide height of the second air guide arc section to be greater than that of the first air guide arc section. This allows the second air guide arc section to provide a larger turning radius, thereby effectively enhancing the guiding effect of the second air guide arc section on the airflow. This not only improves leakage and backflow at the fan inlet and better guides the airflow into the fan casing, but also improves the turbulence intensity inside the fan casing, thereby increasing fan efficiency and reducing noise. Attached Figure Description

[0035] Figure 1 A schematic diagram of the structure of a range hood provided in one embodiment of this application;

[0036] Figure 2 A schematic diagram of the structure of the fan of the range hood according to the above embodiments of this application is shown;

[0037] Figure 3 A schematic diagram of the current collector provided for one embodiment of this application;

[0038] Figure 4 A plan view of a current collector according to the above embodiments of this application is shown;

[0039] Figure 5 As shown Figure 4 The diagram shows a cross-sectional view of the collector along line P1-P1.

[0040] Figure 6 As shown Figure 4 The diagram shows a cross-sectional view of the collector along line P2-P2.

[0041] Figure 7 As shown Figure 4 The diagram shows a cross-sectional view of the collector along line P3-P3.

[0042] Figure 8 As shown Figure 4 The diagram shows a cross-sectional view of the collector along line P4-R4.

[0043] Reference numerals: 10, collector; 101, air inlet side; 102, air outlet side; 11, annular mounting part; 12, first air guide part; 121, first air guide oblique section; 122, first air guide arc section; 123, first air guide extension section; 13, second air guide part; 131, second air guide oblique section; 132, second air guide arc section; 133, second air guide extension section; 14, bracket mounting groove; 20, fan; 21, motor bracket; 30, range hood body. Detailed Implementation

[0044] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be 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 the present invention. However, the present invention can be practiced 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 the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0045] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0046] 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 invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," 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 explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0049] 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.

[0050] Addressing the issues of unstable airflow and severe gas leakage at the inlet of existing range hoods, this application provides a collector and a range hood. The collector features a multi-path, three-dimensional asymmetric structure, which improves the airflow path within a limited space—from the range hood housing through the inlet on the side of the fan casing—entering the fan. It simultaneously improves gas leakage and backflow at the fan inlet in three dimensions: axial, radial, and axial-reverse. This better guides airflow into the fan casing, reducing turbulence intensity inside the casing, thereby increasing fan efficiency and reducing noise.

[0051] Specifically, please refer to Figure 3 The collector 10 of this application may include an annular mounting portion 11, a first air guide portion 12, and a second air guide portion 13, wherein the first air guide portion 12 is connected to the second air guide portion 13. The first air guide portion 12 includes a first air guide oblique section 121 and a first air guide arc section 122. The first air guide oblique section 121 extends obliquely from the inner ring surface of the annular mounting portion 11 toward the air inlet side 101 of the collector 10, and the first air guide arc section 122 extends curvedly from the first air guide oblique section 121 toward the air outlet side 102 of the collector 10. The second air guide section 13 includes a second obliquely cut section 131 and a second arc-shaped section 132. The second obliquely cut section 131 extends obliquely from the inner ring of the annular mounting portion 11 toward the air inlet side 101 of the collector 10, and the second arc-shaped section 132 extends curvedly from the second obliquely cut section 131 toward the air outlet side 102 of the collector 10. The central angle α of the second air guide section 13 is less than 90°, and the air inlet radius of the second arc-shaped section 132 is smaller than the air inlet radius of the first arc-shaped section 122 and the axis of the collector 10, and the air guiding height of the second arc-shaped section 132 is greater than the air guiding height of the first arc-shaped section 122.

[0052] It is understood that the first guide oblique section 121 and the second guide oblique section 131 are used to connect the first guide arc section 122 and the second guide arc section 132 with the annular mounting section, respectively, and the first guide arc section 122 and the second guide arc section 132 are used to guide the gas into the fan 20. The inlet radius of the first guide arc segment 122 is the straight-line distance between the first guide arc segment 122 and the axis of the collector 10. The guide height of the first guide arc segment 122 is the straight-line height between the first guide arc segment 122 along the axis of the collector 10 and the surface of the outlet side 102 of the collector 10 near the annular mounting portion 11. The inlet radius of the second guide arc segment 132 is the straight-line distance between the second guide arc segment 132 and the axis of the collector 10. The guide height of the second guide arc segment 132 is the straight-line height between the second guide arc segment 132 along the axis of the collector 10 and the surface of the outlet side 102 of the collector 10 near the annular mounting portion 11. The inlet radius and guide height together determine the turning radius of the airflow guided by the guide arc segment. The smaller the inlet radius and the larger the guide height, the larger the turning radius of the guide arc segment.

[0053] like Figure 1 , Figure 2 and Figure 4 As shown, when the collector 10 is applied to the fan 20 and the range hood, a coordinate system is established with the center of the annular mounting portion 11 of the collector 10. The air inlet of the range hood is positioned in the third and fourth quadrants, and the air outlet of the fan 20 is positioned in the first quadrant. Therefore, the first air guide portion 12 can be positioned in the first, third, and fourth quadrants, but the second air guide portion cannot be positioned in the second quadrant. Because the portion of the collector 10 in the second quadrant is relatively far from the air inlet of the range hood, the airflow rate of the fan 20's air inlet in the second quadrant is less than that in the third and fourth quadrants. Conversely, because the portion of the collector 10 in the first quadrant is close to the air outlet of the fan 20, the airflow rate of the fan 20's air inlet in the first quadrant is also greater than that in the second quadrant. Since the smaller the airflow rate, the larger the turning radius required for the collector 10 to guide the airflow is. Therefore, the collector 10 of this application controls the air inlet radius of the second air guide arc section 132 to be smaller than that of the first air guide arc section 122, and controls the air guide height of the second air guide arc section 132 to be greater than that of the first air guide arc section 122, so that the second air guide arc section 132 can provide a larger turning radius, thereby effectively enhancing the guiding effect of the second air guide arc section 132 on the airflow. This not only improves the leakage and backflow at the air inlet of the fan 20 and better guides the airflow into the volute of the fan 20, but also improves the turbulence intensity inside the volute of the fan 20, thereby improving the efficiency of the fan 20 and reducing noise.

[0054] like Figure 4 As shown, in some embodiments, the air inlet radius of the second guide arc segment 132 has a tendency to first decrease and then increase, and the first guide arc segment 122 and the second guide arc segment 132 satisfy the following relationship: 0.85×R1≤R n ≤0.95×R1; where R1 is the air inlet radius of the first guide arc segment 122; R n The air inlet radius of the second guide arc section 132.

[0055] By controlling the relationship between the air inlet radius of the second air guide arc section 132 and the first air guide arc section 122, this configuration ensures that the second air guide arc section 132 has the best air guiding and anti-backflow effect. Furthermore, by controlling the second air guide arc section 132 to have a smaller air guiding radius, the anti-backflow effect of the impeller leading edge of the fan 20 can be enhanced.

[0056] In some embodiments, the air inlet radius of the first air guide arc section 122 satisfies the following relationship: R1 = Rt; and 5mm ≤ t ≤ 20mm; where R1 is the air inlet radius of the first air guide arc section 122, R is the inner radius of the impeller of the fan 20 used to assemble the collector 10, and t is the clearance of the impeller of the fan 20.

[0057] It is understandable that the impeller's internal radius affects the airflow and pressure of the fan 20, and the impeller's clearance affects leakage loss and turbulence. Therefore, according to the above relationship, by controlling the relationship between the airflow radius of the first guide arc section 122, the impeller's internal radius, and the impeller's clearance within a reasonable range, the airflow radius of the fan 20 can be matched with the impeller's internal radius, thereby enhancing the guiding capacity of the first guide section 12, reducing airflow leakage, and also reducing turbulence within the volute and noise generated by the fan 20.

[0058] In some embodiments, the inner diameter of the annular mounting portion 11 satisfies the relationship: 1.1 × R1 ≤ R a ≤1.5×R1; where R1 is the air inlet radius of the first guide arc segment 122; R a The inner diameter of the annular mounting part 11.

[0059] With this configuration, the inner diameter of the annular mounting portion 11 is the starting radius of the first air guide portion 12 and the second air guide portion 13. According to the above relationship, the inner diameter of the annular mounting portion 11 is set according to the air inlet radius of the first air guide arc segment 122, which can control the inner diameter of the annular mounting portion 11 within a reasonable range, so that the first air guide portion 12 has a stronger air guiding capacity.

[0060] In some embodiments, the air guiding height of the first air guiding arc segment 122 and the air guiding height of the second air guiding arc segment 132 satisfy the relationship H. 11 ≤H n1 ≤1.5×H 11 ; where H 11 H is the air guiding height of the first air guiding arc segment 122. n1 The air guiding height of the second air guiding arc segment 132 is defined as follows. With this configuration, according to the above formula, the second air guiding section 13 can be controlled to have a higher air guiding height than the first air guiding section 12, thereby enabling the second air guiding arc segment 132 to provide a larger turning radius and enhancing the air guiding effect of the second air guiding section 13.

[0061] For example, in some embodiments, the air guiding height H of the first air guiding arc segment 122 is... 11 The range is 5mm to 15mm. This is based on the air guiding height H of the first guide arc segment 122. 11 The range can be used to determine the air guiding height H of the second air guiding arc segment 132. n1 The range is from 5mm to 22.5mm.

[0062] like Figure 3 As shown, in some embodiments, the first air guide portion 12 further includes a first air guide extension 123 extending from the first air guide arc segment 122 along the tangential direction of the first air guide arc segment 122, and the second air guide portion 13 further includes a second air guide extension 133 extending from the second air guide arc segment 132 along the tangential direction of the second air guide arc segment 132. The first air guide extension 123 and the second air guide extension 133 intersect with the first air guide arc segment 122 and the second air guide arc segment 132, respectively, to enhance the airflow guiding effect of the collector 10 and define the direction of the airflow flowing into the volute of the fan 20.

[0063] Exemplarily, in some embodiments, the length L1 of the first air guide extension 123 ranges from 0 mm to 6 mm. The length L of the second air guide extension 133 is... n The range is from 0mm to 6mm.

[0064] For example, in some embodiments, the angle ω1 between the first air guide extension 123 and the annular mounting portion 11 ranges from 90° to 110°; the angle ω1 between the second air guide extension 133 and the annular mounting portion 11... n The range is from 90° to 110°.

[0065] In some embodiments, the first air guide extension 123 and the second air guide extension 133 satisfy the relationship: 5mm ≤ H 12 =H n2≤20mm; where H 12 H is the depth of the first air guide extension section 123. n2 The depth of the second air guide extension 133 is defined as follows: The depth of the first air guide extension 123 is the straight-line height between the air guide extension along the axial direction of the collector 10 and the surface of the air outlet side 102 of the collector 10 near the annular mounting portion 11; the depth of the second air guide extension 133 is the straight-line height between the air guide extension along the axial direction of the collector 10 and the surface of the air outlet side 102 of the collector 10 near the annular mounting portion 11. By controlling the depth of the first air guide extension 123 and the second air guide extension to be the same, the portion of the collector 10 extending into the fan 20 casing can have a flush bottom surface. Furthermore, by controlling the range of the depth of the first air guide extension 123 and the second air guide extension 133, interference between the first air guide extension 123 and the second air guide extension 133 and the impeller of the fan 20 can be avoided.

[0066] like Figure 3 As shown, in some embodiments, the collector 10 has four bracket mounting slots 14, which are respectively and spaced apart from the first air guide 12 and the second air guide 13. The bracket mounting slots 14 are used to fix the motor bracket 21. The bracket mounting slots 14 can be formed by inward recesses in the first air guide 12 and the second air guide 13. By installing the motor bracket 21 into the bracket mounting slots 14 of the collector 10, an integrated motor bracket 21 assembly can be formed.

[0067] The current collector of this application will be further described below with reference to specific embodiments.

[0068] The collector in this embodiment includes an annular mounting part, a first air guide part and a second air guide part. The first air guide part includes a first air guide oblique section, a first air guide arc section and a first air guide extension section. The second air guide part includes a second air guide oblique section, a second air guide arc section and a second air guide extension section.

[0069] like Figure 5 The diagram shown is a cross-sectional view of the collector P1-P1 in this embodiment. The P1-P1 cross-sectional line coincides with the X-axis. A1 is the starting point of the first oblique section of the air guide; B1 is the highest point of the first oblique section of the air guide and the starting point of the first arc-shaped section of the air guide; C1 is the ending point of the first arc-shaped section of the air guide and the starting point of the first extended section of the air guide; D1 is the ending point of the first extended section of the air guide; R1 is the inlet radius of the first arc-shaped section of the air guide; R... a H is the inner diameter of the annular mounting part. 11 H is the air guiding height of the first air guiding arc segment. 12L1 is the depth of the first air guide extension, L1 is the length of the first air guide extension, and ω1 is the angle between the first air guide extension and the annular mounting part.

[0070] like Figure 6 The diagram shown is a cross-sectional view of the collector P2-P2 in this embodiment. The angle between the P2-P2 section line and the X-axis is α2. A2 is the starting point of the second guide oblique section; B2 is the highest point of the second guide oblique section and the starting point of the second guide arc section; C2 is the ending point of the second guide arc section and the starting point of the second guide extension section; D2 is the ending point of the second guide extension section; R2 is the inlet radius of the second guide arc section; R... a H is the inner diameter of the annular mounting part. 21 H is the air guiding height of the second air guiding arc segment. 22 L2 is the depth of the second air guide extension, L2 is the length of the second air guide extension, and ω2 is the angle between the second air guide extension and the annular mounting part.

[0071] like Figure 7 The diagram shown is a cross-sectional view of the collector P3-P3 in this embodiment. The angle between the P3-P3 cross-section and the X-axis is α3. A3 is the starting point of the second guide oblique section; B3 is the highest point of the second guide oblique section and the starting point of the second guide arc section; C3 is the ending point of the second guide arc section and the starting point of the second guide extension section; D3 is the ending point of the second guide extension section; R3 is the inlet radius of the second guide arc section; R... a H is the inner diameter of the annular mounting part. 31 H is the air guiding height of the second air guiding arc segment. 32 L3 is the depth of the second air guide extension, L3 is the length of the second air guide extension, and ω3 is the angle between the second air guide extension and the annular mounting part.

[0072] like Figure 8 The diagram shown is a cross-sectional view of the collector P4-P4 in this embodiment. The angle between the P4-P4 cross-sectional line and the X-axis is α4. A4 is the starting point of the second guide oblique section; B4 is the highest point of the second guide oblique section and the starting point of the second guide arc section; C4 is the ending point of the second guide arc section and the starting point of the second guide extension section; D4 is the ending point of the second guide extension section; R4 is the inlet radius of the second guide arc section; R... a H is the inner diameter of the annular mounting part. 41 H is the air guiding height of the second air guiding arc segment. 42L4 is the depth of the second air guide extension, L4 is the length of the second air guide extension, and ω4 is the angle between the second air guide extension and the annular mounting part.

[0073] from Figure 5 , Figure 6 , Figure 7 and Figure 8 As can be seen, the inlet radii R2, R3, and R4 shown in the three cross-sections of the second guide arc segment are all smaller than the inlet radius R1 shown in the cross-section of the first guide arc segment, and R2, R3, and R4 show a trend of first increasing and then decreasing. The guide height H shown in the three cross-sections of the second guide arc segment is... 21 H 31 and H 41 All are greater than the air guiding height H shown in the cross-section of the first air guiding arc segment. 11 The depth H shown in the three cross-sections of the second guide arc segment 22 H 32 and H 42 All are equal to the depth H shown in the cross-section of the first guide arc segment. 12 Therefore, the second air guide arc segment can provide a larger turning radius than the first air guide arc segment, thus giving the second air guide arc segment a stronger guiding effect.

[0074] Furthermore, such as Figure 1 As shown, this application also provides a range hood, which may include a range hood body 30, a fan 20, and a collector 10 as described above. The air inlet of the range hood body 30 faces downward; the fan 20 is installed on the range hood body 30, the air inlet of the fan 20 faces forward of the range hood body 30, and the air outlet of the fan 20 faces upward; the collector 10 is installed at the air inlet of the fan 20, and the second air guide arc section of the collector 10 is located on the side away from the air inlet of the range hood body 30 and away from the air outlet of the fan 20.

[0075] 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.

[0076] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A collector for installation on a fan, characterized in that, include: Circular mounting section; The first air guide section includes a first air guide oblique section extending obliquely from the inner ring of the annular mounting section toward the air inlet side of the collector, and a first air guide arc section extending curvedly from the first air guide oblique section toward the air outlet side of the collector. as well as The second air guide section is connected to the first air guide section. The second air guide section includes a second obliquely shaped section extending obliquely from the inner ring of the annular mounting portion toward the air inlet side of the collector, and a second curved section extending curvedly from the second obliquely shaped section toward the air outlet side of the collector. The central angle of the second air guide section is... The angle is less than 90°. The air inlet radius of the second air guide arc section is smaller than the air inlet radius of the first air guide arc section and the axis of the collector. The air guide height of the second air guide arc section is greater than the air guide height of the first air guide arc section. The air inlet radius of the second air guide arc section has a trend of first decreasing and then increasing.

2. The current collector according to claim 1, characterized in that, Furthermore, the first air-guiding arc segment and the second air-guiding arc segment satisfy the following relationship: ； in, The air inlet radius of the first air-guiding arc segment; The air inlet radius is the second air guide arc segment.

3. The current collector according to claim 2, characterized in that, The air inlet radius of the first guide arc segment satisfies the following relationship: ;and ； in, The air inlet radius of the first guide arc segment is denoted as . The inner radius of the impeller of the fan used to assemble the collector. This refers to the clearance of the impeller of the fan.

4. The current collector according to claim 2, characterized in that, The inner diameter of the annular mounting part satisfies the following relationship: ； in, The air inlet radius of the first air-guiding arc segment; The inner diameter of the annular mounting portion.

5. The current collector according to any one of claims 2 to 4, characterized in that, The air guiding heights of the first and second air guiding arc sections satisfy the following relationship: ； in, The air guiding height is the first air guiding arc segment. The guide height is the second guide arc segment.

6. The current collector according to claim 5, characterized in that, The air guiding height of the first air guiding arc section The range is from 5mm to 15mm.

7. The current collector according to any one of claims 1 to 4, characterized in that, The first air guide portion further includes a first air guide extension section extending from the first air guide arc segment along the tangential direction of the first air guide arc segment, and the second air guide portion further includes a second air guide extension section extending from the second air guide arc segment along the tangential direction of the second air guide arc segment.

8. The current collector according to claim 7, characterized in that, Length of the first air guide extension section The range is 0mm to 6mm; the length of the second air guide extension section The range is from 0mm to 6mm.

9. The current collector according to any one of claims 7, characterized in that, The angle between the first air guide extension and the annular mounting portion The range is 90° to 110°; the angle between the second air guide extension and the annular mounting portion The range is from 90° to 110°.

10. The current collector according to claim 7, characterized in that, The first air guide extension and the second air guide extension satisfy the following relationship: ； in, This refers to the depth of the first air guide extension section. This refers to the depth of the second air guide extension section.

11. The current collector according to any one of claims 1 to 4, characterized in that, The collector has four bracket mounting slots, which are respectively and spaced apart in the first air guide section and the second air guide section, and are used to fix the motor brackets respectively.

12. A range hood, characterized in that, include: The main body of the range hood has its air inlet facing downwards. A fan is installed on the main body of the range hood, with the air inlet of the fan facing the front of the main body of the range hood and the air outlet of the fan facing the top of the main body of the range hood. The collector as described in any one of claims 1 to 11, wherein the collector is installed at the air inlet of the fan, and the second air guiding arc section of the collector is located on the side away from the air inlet of the range hood body and away from the air outlet of the fan.

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