Current collector and range hood

Abstract

The invention relates to a current collector and a range hood. The current collector is used for being mounted on a fan and comprises an annular mounting part and a flow guide part, the first air guide part comprises a first air guide beveled section and a first air guide arc-shaped section; the second air guide part is connected to the first air guide part, the second air guide part comprises a second air guide beveled section and a second air guide arc-shaped section, the central angle alpha 1 of the second air guide part is smaller than 90 degrees, and the air inlet radius of the second air guide arc-shaped section is controlled to be smaller than that of the first air guide arc-shaped section; the air guide height of the second air guide arc-shaped section is controlled to be larger than that of the first air guide arc-shaped section, so that the second air guide arc-shaped section can provide a larger turning radius, the air flow guide effect of the second air guide arc-shaped section can be effectively enhanced, leakage backflow at the air inlet of the fan can be improved, and the air guide efficiency is improved. Air flow can be better guided into the volute of the fan, the turbulence intensity in the volute of the fan can be improved, and therefore the efficiency of the fan is improved, and noise is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of range hoods, and particularly to a collector and a range hood. Background Art

[0002] At present, the existing range hoods generally adopt a multi-wing centrifugal fan system as the core power system. The air flow is guided into the fan system through a collector before the inlet of the fan system to do work and then discharged. At the same time, the problem of return air flow caused by the back pressure of the common flue can be reduced.

[0003] The multi-wing centrifugal fan adopted by the range hood belongs to a radial flow fan, which is mostly installed in a box. Unlike an axial flow fan that can intake air in a 360° cycle, it also requires the air flow to turn from the axial direction to the radial direction. Due to the complex use environment of the range hood, affected by the resistance of the smoke pipe, the common flue, and the back pressure of the common flue, a collector is generally used to introduce air. The ordinary collector usually adopts a design form with a consistent longitudinal section, that is, the intake radius of the collector remains uniformly consistent, and the gas can be uniformly introduced into the fan. However, using a collector that can uniformly guide air is prone to serious gas leakage problems, resulting in unstable air flow at the air inlet on the side of the fan volute. Even the eddy current at the air inlet and the secondary air flow in the volute can cause the problem of increased noise, making the overall efficiency of the fan system relatively low. Summary of the Invention

[0004] Based on this, in view of the problems of unstable air flow at the air inlet and serious gas leakage of the fan of the existing range hood, it is necessary to provide a collector and a range hood.

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

[0006] An annular mounting portion;

[0007] A first air guiding portion, the first air guiding portion includes a first air guiding inclined section extending obliquely from the inner ring surface of the annular mounting portion to the air inlet side of the collector and a first air guiding arc section extending curvedly from the first air guiding inclined section to the air outlet side of the collector; and

[0008] A second air guiding portion, the second air guiding portion is connected to the first air guiding portion, the second air guiding portion includes a second air guiding inclined section extending obliquely from the inner ring surface of the annular mounting portion to the air inlet side of the collector and a second air guiding arc section extending curvedly from the second air guiding inclined section to the air outlet side of the collector, the central angle α of the second air guiding portion 1 is less than 90°, the intake radius of the second air guiding arc section is less than the intake radius of the first air guiding arc section and the axis of the collector, and the air guiding height of the second air guiding arc section is greater than the air guiding height of the first air guiding arc 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 relational expression:

[0010] 0.85×R 1 ≤R n ≤0.95×R 1 ;

[0011] wherein, R 1 is the air inlet radius of the first air guiding arc segment; R n is the air inlet radius of the second air guiding arc segment.

[0012] In some embodiments, the air inlet radius of the first air guiding arc segment satisfies the relational expression:

[0013] R 1 =R - t; and

[0014] 5mm ≤ t ≤ 20mm;

[0015] wherein, R 1 is the air inlet radius of the first air guiding arc segment, R is the inner radius of the impeller of the fan for assembling the air 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 relational expression:

[0017] 1.1×R 1 ≤R a ≤1.5×R 1 ;

[0018] wherein, R 1 is the air inlet radius of the first air guiding arc segment; R a is 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 relational expression:

[0020] H 11 ≤H n1 ≤1.5×H 11 ;

[0021] wherein, H 11 is the air guiding height of the first air guiding arc segment, H n1 is the air guiding height of the second air guiding arc segment.

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

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

[0024] In some embodiments, the length L of the first air guiding extension section 1 ranges from 0 mm to 6 mm; the length L of the second air guiding extension section n ranges from 0 mm to 6 mm.

[0025] In some embodiments, the included angle ω between the first air guiding extension section and the annular mounting portion 1 ranges from 90° to 110°; the included angle ω between the second air guiding extension section and the annular mounting portion n ranges from 90° to 110°.

[0026] In some embodiments, the first air guiding extension section and the second air guiding extension section satisfy the relational expression:

[0027] 5 mm ≤ H 12 = H n2 ≤ 20 mm;

[0028] wherein, H 12 is the penetration height of the first air guiding extension section, and H n2 is the penetration height of the second air guiding extension section.

[0029] In some embodiments, the air collector has four bracket mounting slots which are respectively and spacedly arranged on the first air guiding portion and the second air guiding portion, and the bracket mounting slots are used for respectively fixing motor brackets.

[0030] An oil fume suction machine, comprising:

[0031] An oil fume suction machine main body, the air inlet of the oil fume suction machine main body facing downward of the oil fume suction machine main body;

[0032] A fan, the fan being installed on the oil fume suction machine main body, the air inlet of the fan facing forward of the oil fume suction machine main body, and the air outlet of the fan facing upward of the oil fume suction machine main body;

[0033] The air collector as described in any one of the above, the air collector being installed at the air inlet of the fan, and the second air guiding arc section of the air collector being located on a side away from the air inlet of the oil fume suction machine main body and away from the air outlet of the fan.

[0034] By controlling the air inlet radius of the second air guiding arc section to be smaller than that of the first air guiding arc section and the air guiding height of the second air guiding arc section to be greater than that of the first air guiding arc section, the current collector of the present application enables the second air guiding arc section to provide a larger turning radius, thereby effectively enhancing the guiding effect of the second air guiding arc section on the air flow. This can not only improve the leakage and backflow at the air inlet of the fan and better guide the air flow into the volute of the fan, but also improve the turbulence intensity in the volute of the fan, thus enhancing the fan efficiency and reducing the noise. Description of the Drawings

[0035] Figure 1 Schematic structural diagram of a range hood provided by an embodiment of the present application;

[0036] Figure 2 Schematic structural diagram of the fan of the range hood according to the above embodiment of the present application;

[0037] Figure 3 Schematic structural diagram of a current collector provided by an embodiment of the present application;

[0038] Figure 4 Schematic plan view of the current collector according to the above embodiment of the present application;

[0039] Figure 5 As shown in Figure 4 the P 1 -P 1 cross-sectional schematic diagram of the current collector;

[0040] Figure 6 As shown in Figure 4 the P 2 -P 2 cross-sectional schematic diagram of the current collector;

[0041] Figure 7 As shown in Figure 4 the P 3 -P 3 cross-sectional schematic diagram of the current collector;

[0042] Figure 8 As shown in Figure 4 the P 4 -R 4 cross-sectional schematic diagram.

[0043] Reference numerals: 10, air collector; 101, air inlet side; 102, air outlet side; 11, annular mounting portion; 12, first air guiding portion; 121, first inclined air guiding section; 122, first arc-shaped air guiding section; 123, first extended air guiding section; 13, second air guiding portion; 131, second inclined air guiding section; 132, second arc-shaped air guiding section; 133, second extended air guiding section; 14, bracket mounting groove; 20, fan; 21, motor bracket; 30, main body of range hood. Detailed implementation manners

[0044] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe the detailed implementation manners of the present invention in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

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

[0046] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0047] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is less than that of the second feature.

[0049] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate 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 intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0050] Based on the problems existing in the fans of current range hoods, such as unstable air flow at the air inlet and serious gas leakage, the present application provides a collector and a range hood. The collector has a multi-path three-dimensional asymmetric structure, which can improve the air flow in the path of the air flow entering the fan from the box body of the range hood through the air inlet on the side of the volute of the fan in a limited space, improve the gas leakage and backflow at the air inlet of the fan simultaneously from three dimensions: axial, radial and axial, can better guide the air flow into the volute interior, improve the turbulence intensity inside the volute of the fan, thereby improving the fan efficiency and reducing the noise.

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

[0052] It can be understood that the first inclined air guiding section 121 and the second inclined air guiding section 131 are respectively used to connect the first arcuate air guiding section 122 and the second arcuate air guiding section 132 to the annular mounting section, and the first arcuate air guiding section 122 and the second arcuate air guiding section 132 are used to introduce gas into the fan 20. The air inlet radius of the first arcuate air guiding section 122 is the straight-line distance between the first arcuate air guiding section 122 and the axis of the current collector 10, and the air guiding height of the first arcuate air guiding section 122 is the straight-line height between the first arcuate air guiding section 122 along the axis direction of the current collector 10 and the surface of the air outlet side 102 of the current collector 10 close to the annular mounting portion 11. The air inlet radius of the second arcuate air guiding section 132 is the straight-line distance between the second arcuate air guiding section 132 and the axis of the current collector 10, and the air guiding height of the second arcuate air guiding section 132 is the straight-line height between the second arcuate air guiding section 132 along the axis direction of the current collector 10 and the surface of the air outlet side 102 of the current collector 10 close to the annular mounting portion 11. The air inlet radius and the air guiding height jointly determine the turning radius of the arcuate air guiding section when guiding the air flow. The smaller the air inlet radius and the larger the air guiding height, the larger the turning radius of the arcuate air guiding section.

[0053] Such as Figure 1 , Figure 2 and Figure 4As shown, when the current 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 current collector 10 as the origin. The air inlet of the range hood is arranged in the third and fourth quadrants, and the air outlet of the fan 20 is arranged in the first quadrant. Then, the first air guiding portion 12 can be arranged in the first, third, and fourth quadrants, and the second air guiding portion cannot be arranged in the second quadrant. Since the part of the current collector 10 in the second quadrant is at a relatively large distance from the air inlet of the range hood, the air flow rate at the air inlet of the fan 20 in the second quadrant is less than that in the third and fourth quadrants. And because the part of the current collector 10 in the first quadrant is close to the air outlet of the fan 20, the air flow rate at the air inlet of the fan 20 in the first quadrant is also greater than that at the air inlet of the fan 20 in the second quadrant. Since the smaller the air flow rate, the larger the turning radius required for the current collector 10 to guide the air flow. Therefore, the current collector 10 of the present application controls the air inlet radius of the second air guiding arc segment 132 to be smaller than that of the first air guiding arc segment 122, and controls the air guiding height of the second air guiding arc segment 132 to be greater than that of the first air guiding arc segment 122, so that the second air guiding arc segment 132 can provide a larger turning radius, thereby effectively enhancing the air guiding effect of the second air guiding arc segment 132. This can not only improve the leakage and backflow at the air inlet of the fan 20, better guide the air flow into the volute of the fan 20, but also improve the turbulence intensity in the volute of the fan 20, thus enhancing the efficiency of the fan 20 and reducing the noise.

[0054] As Figure 4 shown, in some embodiments, the air inlet radius of the second air guiding arc segment 132 has a tendency to first decrease and then increase, and the first air guiding arc segment 122 and the second air guiding arc segment 132 satisfy the following relationship: 0.85×R 1 ≤R n ≤0.95×R 1 ; where R 1 is the air inlet radius of the first air guiding arc segment 122; R n is the air inlet radius of the second air guiding arc segment 132.

[0055] With such a setting, by controlling the relationship between the air inlet radius of the second air guiding arc segment 132 and the first air guiding arc segment 122, the best air guiding and anti-backflow effects of the second air guiding arc segment 132 can be ensured. And by controlling the second air guiding arc segment 132 to have a smaller air guiding radius, the anti-backflow effect at the leading edge of the impeller of the fan 20 can be strengthened.

[0056] In some embodiments, the air inlet radius of the first air guiding arc segment 122 satisfies the relationship: R 1 = R - t; and 5mm ≤ t ≤ 20mm; where R 1is the inlet radius of the first air guiding arc segment 122, R is the inner radius of the impeller of the fan 20 for assembling the air collector 10, and t is the clearance of the impeller of the fan 20.

[0057] It can be understood that the inner radius of the impeller can affect the air intake volume and pressure of the fan 20, and the clearance of the impeller can affect the leakage loss and turbulence conditions. Therefore, according to the above relational formula, by controlling the relationship among the inlet radius of the first air guiding arc segment 122, the inner radius of the impeller, and the clearance of the impeller within a reasonable range, the inlet radius of the fan 20 can be matched with the inner radius of the impeller, thereby enhancing the air guiding ability of the first air guiding part 12, reducing air leakage, and also reducing the turbulence in the volute and the noise generated by the fan 20.

[0058] In some embodiments, the inner diameter of the annular mounting part 11 satisfies the relational formula: 1.1×R 1 ≤R a ≤1.5×R 1 ; where R 1 is the inlet radius of the first air guiding arc segment 122; R a is the inner diameter of the annular mounting part 11.

[0059] With such a setting, the inner diameter of the annular mounting part 11 is the starting radius of the first air guiding part 12 and the second air guiding part 13. According to the above relational formula, by setting the inner diameter of the annular mounting part 11 according to the inlet radius of the first air guiding arc segment 122, the inner diameter of the annular mounting part 11 can be controlled within a reasonable range, so that the first air guiding part 12 has a stronger air guiding ability.

[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 relational formula H 11 ≤H n1 ≤1.5×H 11 ; where H 11 is the air guiding height of the first air guiding arc segment 122, and H n1 is the air guiding height of the second air guiding arc segment 132. With such a setting, according to the above relational formula, it can be controlled that the second air guiding part 13 has a higher air guiding height than the first air guiding part 12, so that the second air guiding arc segment 132 can provide a larger turning radius and enhance the air guiding effect of the second air guiding part 13.

[0061] Exemplarily, in some embodiments, the air guiding height H 11 of the first air guiding arc segment 122 ranges from 5 mm to 15 mm. According to the range of the air guiding height H 11 of the first air guiding arc segment 122, the air guiding height Hn1 ranges from 5 mm to 22.5 mm.

[0062] As Figure 3 shown, in some embodiments, the first air guiding portion 12 further includes a first air guiding extension section 123 extending along the tangent direction of the first air guiding arc section 122 from the first air guiding arc section 122, and the second air guiding portion 13 further includes a second air guiding extension section 133 extending along the tangent direction of the second air guiding arc section 132 from the second air guiding arc section 132. The first air guiding extension section 123 and the second air guiding extension section 133 are respectively connected to the first air guiding arc section 122 and the second air guiding arc section 132, and are used to enhance the air guiding effect of the air collector 10 and define the direction of the air flow flowing into the volute of the fan 20.

[0063] Exemplarily, in some embodiments, the length L of the first air guiding extension section 123 1 ranges from 0 mm to 6 mm. The length L of the second air guiding extension section 133 n ranges from 0 mm to 6 mm.

[0064] Exemplarily, in some embodiments, the included angle ω between the first air guiding extension section 123 and the annular mounting portion 11 1 ranges from 90° to 110°; the included angle ω between the second air guiding extension section 133 and the annular mounting portion 11 n ranges from 90° to 110°.

[0065] In some embodiments, the first air guiding extension section 123 and the second air guiding extension section 133 satisfy the relational expression: 5 mm ≤ H 12 = H n2 ≤ 20 mm; where H 12 is the penetration height of the first air guiding extension section 123, and H n2 is the penetration height of the second air guiding extension section 133. The penetration height of the first air guiding extension section 123 is the straight-line height between the air guiding extension portion and the surface of the air outlet side 102 of the air collector 10 close to the annular mounting portion 11 along the axis direction of the air collector 10, and the penetration height of the second air guiding extension section 133 is the straight-line height between the air guiding extension portion and the surface of the air outlet side 102 of the air collector 10 close to the annular mounting portion 11 along the axis direction of the air collector 10. With such a setting, by controlling the penetration heights of the first air guiding extension section 123 and the air guiding extension section to be the same, it is possible to make the bottom surface of the part of the air collector 10 extending into the volute of the fan 20 flat. At the same time, by controlling the ranges of the penetration heights of the first air guiding extension section 123 and the second air guiding extension section 133, it is possible to avoid interference between the first air guiding extension section 123 and the second air guiding extension section 133 and the impeller of the fan 20.

[0066] As shown Figure 3 In some embodiments, the current collector 10 has four bracket mounting grooves 14, which are respectively and spacedly arranged on the first air guiding portion 12 and the second air guiding portion 13. The bracket mounting grooves 14 are used to respectively fix the motor bracket 21. The bracket mounting grooves 14 can be formed by inward depressions of the first air guiding portion 12 and the second air guiding portion 13. By installing the motor bracket 21 in the bracket mounting grooves 14 of the current collector 10, an integrated motor bracket 21 assembly can be formed.

[0067] Exemplarily, the current collector of the present application will be further described below in conjunction with specific embodiments.

[0068] The current collector in this embodiment includes an annular mounting portion, a first air guiding portion, and a second air guiding portion. The first air guiding portion includes a first air guiding inclined section, a first air guiding arc section, and a first air guiding extension section. The second air guiding portion includes a second air guiding inclined section, a second air guiding arc section, and a second air guiding extension section.

[0069] As shown Figure 5 is a schematic cross-sectional view of the current collector of this embodiment at P 1 -P 1 where the P 1 -P 1 section line coincides with the X-axis, A 1 is the extension starting point of the first air guiding inclined section, B 1 is the highest point of the first air guiding inclined section and the extension starting point of the first air guiding arc section, C 1 is the extension ending point of the first air guiding arc section and the extension starting point of the first air guiding extension section, D 1 is the extension ending point of the first air guiding extension section, R 1 is the air inlet radius of the first air guiding arc section, R a is the inner diameter of the annular mounting portion, H 11 is the air guiding height of the first air guiding arc section, H 12 is the penetration height of the first air guiding extension section, L 1 is the length of the first air guiding extension section, ω 1 is the angle between the first air guiding extension section and the annular mounting portion.

[0070] As shown Figure 6 is a schematic cross-sectional view of the current collector of this embodiment at P 2 -P 2 where the P 2 -P 2 section line has an angle α 2 with the X-axis, A 2 is the extension starting point of the second air guiding inclined section, B 2is the highest point of the second air guiding inclined section and the starting point of the extension of the second air guiding arc section, C 2 is the ending point of the extension of the second air guiding arc section and the starting point of the extension of the second air guiding extension section, D 2 is the ending point of the extension of the second air guiding extension section, R 2 is the air inlet radius of the second air guiding arc section, R a is the inner diameter of the annular mounting portion, H 21 is the air guiding height of the second air guiding arc section, H 22 is the penetration height of the second air guiding extension section, L 2 is the length of the second air guiding extension section, ω 2 is the included angle between the second air guiding extension section and the annular mounting portion.

[0071] As Figure 7 shown is the cross-sectional schematic diagram of the air collector of this embodiment at P 3 -P 3 where the included angle between the cross-sectional line of P 3 -P 3 and the X-axis is α 3 , A 3 is the starting point of the extension of the second air guiding inclined section, B 3 is the highest point of the second air guiding inclined section and the starting point of the extension of the second air guiding arc section, C 3 is the ending point of the extension of the second air guiding arc section and the starting point of the extension of the second air guiding extension section, D 3 is the ending point of the extension of the second air guiding extension section, R 3 is the air inlet radius of the second air guiding arc section, R a is the inner diameter of the annular mounting portion, H 31 is the air guiding height of the second air guiding arc section, H 32 is the penetration height of the second air guiding extension section, L 3 is the length of the second air guiding extension section, ω 3 is the included angle between the second air guiding extension section and the annular mounting portion.

[0072] As Figure 8 shown is the cross-sectional schematic diagram of the air collector of this embodiment at P 4 -P 4 where the included angle between the cross-sectional line of P 4 -P 4 and the X-axis is α 4 , A 4 is the starting point of the extension of the second air guiding inclined section, B 4 is the highest point of the second air guiding inclined section and the starting point of the extension of the second air guiding arc section, C 4is the extension end point of the second air guiding arc segment and the extension start point of the second air guiding extension segment, D 4 is the extension end point of the second air guiding extension segment, R 4 is the air inlet radius of the second air guiding arc segment, R a is the inner diameter of the annular mounting portion, H 41 is the air guiding height of the second air guiding arc segment, H 42 is the penetration height of the second air guiding extension segment, L 4 is the length of the second air guiding extension segment, ω 4 is the included angle between the second air guiding extension segment and the annular mounting portion.

[0073] From Figure 5 , Figure 6 , Figure 7 and Figure 8 it can be seen that the air inlet radii R 2 , R 3 and R 4 shown in the three cross-sections of the second air guiding arc segment are all smaller than the air inlet radius R 1 shown in the cross-section of the first air guiding arc segment, and R 2 , R 3 and R 4 have a tendency of first increasing and then decreasing. The air guiding heights H 21 , H 31 and H 41 shown in the three cross-sections of the second air guiding arc segment are all greater than the air guiding height H 11 shown in the cross-section of the first air guiding arc segment, while the penetration heights H 22 , H 32 and H 42 shown in the three cross-sections of the second air guiding arc segment are all equal to the penetration height H 12 shown in the cross-section of the first air guiding arc segment. Therefore, the second air guiding arc segment can provide a larger turning radius compared with the first air guiding arc segment, so that the second air guiding arc segment has a stronger guiding effect.

[0074] Furthermore, as Figure 1 shown, the present application also provides a range hood, which may include a range hood main body 30, a fan 20, and a collector 10 as described in any one of the above. The air inlet of the range hood main body 30 faces downward of the range hood main body 30; the fan 20 is installed on the range hood main body 30, the air inlet of the fan 20 faces forward of the range hood main body 30, and the air outlet of the fan 20 faces upward of the range hood main body 30; the collector 10 is installed at the air inlet of the fan 20, and the second air guiding arc segment of the collector 10 is located on the side far from the air inlet of the range hood main body 30 and far from the air outlet of the fan 20.

[0075] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered as the scope described in this specification.

[0076] The above-described embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A current collector, used for installation on a fan, characterized in that: include: annular mounting portion; A first air guiding portion, the first air guiding portion comprising a first air guiding oblique section extending obliquely from the inner ring surface of the annular mounting portion to the air inlet side of the collector and a first air guiding arc section extending curvedly from the first air guiding oblique section to the air outlet side of the collector; as well as A second air guide portion, the second air guide portion is connected to the first air guide portion, the second air guide portion includes a second air guide bevel section extending obliquely from the inner ring surface of the annular mounting portion toward the air inlet side of the collector and a second air guide arc section extending curvedly from the second air guide bevel section toward the air outlet side of the collector, the central angle α1 of the second air guide portion 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, and the air guiding height of the second air guide arc section is greater than the air guiding height of the first air guide arc section.

2. The current collector according to claim 1, characterized in that: The air inlet radius of the second air guiding arc segment has a trend of first decreasing and then increasing, and the first air guiding arc segment and the second air guiding arc segment satisfy the following relationship: 0.85×R1≤R n ≤0.95×R1; Wherein, R1 is the air inlet radius of the first air guide arc segment; R n is the air inlet radius of the second air guide arc segment.

3. The current collector according to claim 2, characterized in that: The air inlet radius of the first air guiding arc segment satisfies the relationship: R1 = Rt; and 5mm≤t≤20mm; Wherein, R1 is the air inlet radius of the first air guide arc segment, 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.

4. The current collector according to claim 2, characterized in that: The inner diameter of the annular mounting portion satisfies the relationship: 1.1×R1≤R a ≤1.5×R1; Wherein, R1 is the air inlet radius of the first air guide arc segment; R a is 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 height of the first air guiding arc segment and the air guiding height of the second air guiding arc segment satisfy the relationship: H 11 ≤H n1 ≤1.5×H 11 ; Among them, H 11 is the wind guiding height of the first wind guiding arc segment, H n1 is the wind guiding height of the second wind guiding arc segment.

6. The current collector according to claim 5, characterized in that: The wind guiding height H of the first wind guiding arc segment 11 The range is 5mm to 15mm.

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

8. The current collector according to claim 7, characterized in that: The length L1 of the first wind guide extension section ranges from 0 mm to 6 mm; the length L2 of the second wind guide extension section ranges from 0 mm to 6 mm. n The range is 0mm to 6mm.

9. The current collector according to any one of claim 7, characterized in that: The included angle ω1 between the first wind guide extension section and the annular mounting portion is in the range of 90° to 110°; the included angle ω2 between the second wind guide extension section and the annular mounting portion is in the range of 90° to 110°. n The range is 90° to 110°.

10. The current collector according to claim 7, characterized in that: The first air guide extension section and the second air guide extension section satisfy the relationship: 5mm≤H 12 =H n2 ≤20mm; Among them, H 12 H is the depth of the first wind guide extension section, n2 is the depth of the second wind 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 grooves, and the bracket mounting grooves are respectively arranged at intervals on the first air guide portion and the second air guide portion, and the bracket mounting grooves are used to fix the motor brackets respectively.

12. A range hood, characterized in that: include: A range hood body, wherein the air inlet of the range hood body faces downwardly of the range hood body; A fan, the fan being mounted on the range hood body, the air inlet of the fan facing the front of the range hood body, and the air outlet of the fan facing the top of the range hood body; The collector according to any one of claims 1 to 11, wherein the collector is mounted at the air inlet of the fan, and the second air guide arc section of the collector is located at a side away from the air inlet of the range hood body and away from the air outlet of the fan.

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