Range hood

Abstract

The utility model discloses a range hood which comprises an upper box body and a fan system, the fan system comprises a fan, the fan comprises a volute, an impeller, a motor and a fastening nut used for fixing the output end of the impeller and the output end of the motor, a central point is arranged at the intersection of the central axis of the impeller and the outer surface of the fastening nut, and an air inlet is formed in the volute; the mounting bracket is used for mounting the fan in the upper box body; the installation support is installed at the position, below the air inlet, of the volute and comprises a first arm and second arms which are integrally formed, the first arm extends in the width direction of the volute and is tightly attached and fixed to the volute, and the two second arms extend in the direction away from the volute from the two ends of the extending direction of the first arm correspondingly. The end, away from the first arm, of the second arm is connected with the upper box. The second arm is positioned on the upstream of the fan on the oil fume flowing path; a hollowed-out area is formed on each second arm, and reasonable angles are arranged between the inner edge and the outer edge of each hollowed-out area and the center of the air inlet.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil fume purification device, especially an oil fume extractor. BACKGROUND

[0002] The oil fume extractor has become one of the kitchen household electrical appliances in modern family. The oil fume extractor is various at present, including side suction type, top suction type and the like.

[0003] For the top suction type or the side suction type oil fume extractor with fan on top, the fan is arranged above the air inlet part (smoke inlet), and the oil fume rises from below to enter the fan. In order to promote the oil fume to be sucked into the fan, the conventional method is to arrange a flow guide member upstream of the fan, such as the Chinese patents disclosed in application numbers 201821899637.9, 202323627330.7 and 202420482532.2.

[0004] However, these oil fume extractors will increase the cost by additionally arranging the flow guide member, and the installation steps are increased, and the relationship with the fan is also difficult to control, increasing the difficulty of installation. INVENTION CONTENTS

[0005] The utility model solves the technical problem of the prior art, provides an oil fume extractor, fully utilizes the components of the fan system, promotes the oil fume to be sucked into the fan, and improves the oil fume extraction effect.

[0006] The utility model adopts the technical scheme for solving the above technical problem: an oil fume extractor, comprising an upper box body and a fan system, the fan system comprising:

[0007] A fan comprising a volute, an impeller arranged in the volute, a motor for driving the impeller to rotate, and a fastening nut for fixing the output end of the impeller and the motor, the intersection of the central axis of the impeller and the outer surface of the fastening nut has a center point, and an air inlet is formed on the volute; and

[0008] An installation bracket for installing the fan in the upper box body; characterized in that:

[0009] The installation bracket is installed at the position of the volute below the air inlet, the installation bracket comprises integrally formed first and second arms, the first arm extends along the width direction of the volute and is fixed tightly to the volute, the second arm has two and extends away from the volute from the ends of the extension direction of the first arm, respectively, and the end of the second arm away from the first arm is connected to the upper box body;

[0010] The second arms are located upstream of the fan in the oil fume flow path; each of the second arms is formed with a hollowed-out region, an inner side edge of the hollowed-out region of one of the second arms close to the first arm has a first inner side midpoint in the up-down direction, and an outer side edge of the same hollowed-out region away from the first arm has a first outer side midpoint in the up-down direction; an inner side edge of the hollowed-out region of the other of the second arms close to the first arm has a second inner side midpoint in the up-down direction, and an outer side edge of the same hollowed-out region away from the first arm has a second outer side midpoint in the up-down direction; each of the midpoints is located on an inner side surface of the corresponding second arm facing the other of the second arms;

[0011] The first inner side midpoint and the center point are connected by a first line, the second inner side midpoint and the center point are connected by a second line, the first outer side midpoint and the center point are connected by a third line, and the second outer side midpoint and the center point are connected by a fourth line; the first line and the second line have a first included angle a, the third line and the fourth line have a second included angle β, and the relationship between the two included angles satisfies 45°≤a≤70° and 75°≤β≤90°; or the relationship between the two included angles satisfies 4°≤β-a≤20°. The reasonable arrangement of the edges of the hollowed-out regions on the two second arms and the center angle of the air inlet can gather the oil fume entering the upper cabinet into the air inlet before entering the air inlet, thereby improving the oil fume suction effect.

[0012] By arranging the integral mounting bracket with the hollowed-out region, the oil fume located outside the mounting bracket can enter the space surrounded by the mounting bracket through the hollowed-out region, the path of the oil fume entering the fan is shortened, and the amount of oil fume entering the fan is increased; the reasonable arrangement of the edges of the hollowed-out regions on the two second arms and the center angle of the air inlet can gather the oil fume entering the upper cabinet into the air inlet before entering the air inlet, thereby improving the oil fume suction effect; the above effects can be achieved without separately arranging a flow guide member, thereby saving the arrangement and installation of components and simplifying the structure and flow field; in addition, since the second arms are located upstream of the fan, the disordered oil fume flow can be broken, the flow efficiency is improved, and the noise is reduced.

[0013] Preferably, a straight line perpendicular to the horizontal plane passes through the center point, the first line and the straight line have a third included angle a1, the second line and the straight line have a fourth included angle a2, and a2>a1. Since the volute is basically an eccentric structure, based on the installation stability requirement of the mounting bracket, by limiting the sizes of the above angles, the mounting bracket can balance the support of the side with a large area of the volute and the side with a small area of the volute.

[0014] Preferably, a1 and a2 also satisfy the following relationship: 1.2≤a2 / a1≤2.

[0015] Further, the air inlet is provided with a flow collector, the flow collector comprises a radial flow guide part, the shortest distance from the first inner side midpoint to the radial outer side edge of the radial flow guide part of the flow collector is d, the shortest distance from the second inner side midpoint to the radial outer side edge of the radial flow guide part of the flow collector is d', the shortest distance from the first outer side midpoint to the radial outer side edge of the radial flow guide part of the flow collector is e, and the shortest distance from the second outer side midpoint to the radial outer side edge of the radial flow guide part of the flow collector is e', and each parameter satisfies the following relationship: 1.2≤e / d≤2 and 1.2≤e' / d'≤2. In this way, the oil fume entering the air inlet through the hollowed-out area is more uniformly distributed in the path, and the path of the oil fume from the hollowed-out area to the air inlet is shortened.

[0016] According to an aspect of the utility model, the cross section of the hollowed-out area is triangular, and the first inner side midpoint and the second inner side midpoint are the vertices of the triangle.

[0017] Further, the distance between the two second arms increases with the distance from the volute, so that the mounting bracket as a whole has a transversely arranged bridge shape. The inclined second arms also have a certain flow guiding effect, accelerating the airflow to flow to the center of the air inlet of the fan, thereby being quickly discharged.

[0018] Further, along the extension direction of the second arm, the size of the hollowed-out area in the up-down direction gradually decreases from the position away from the first arm towards the first arm. Since the first arm corresponds to the center of the air inlet, by changing the caliber of the hollowed-out area, a Venturi effect is formed, which can gather the oil fume entering the upper cabinet in advance, so that the oil fume flow rate increases with the decrease of the caliber, and the flow is collected and accelerated to enter the air inlet, thereby improving the oil fume extraction effect.

[0019] Further, in order to strengthen the strength of the mounting bracket, the first arm and the second arm of the mounting bracket are respectively provided with flanges on the upper side and the lower side.

[0020] In order to further improve the flow guiding effect, the size of the second arm in the up-down direction gradually decreases from the end portion away from the first arm to the end portion close to the first arm.

[0021] Compared with the prior art, the advantages of this utility model are as follows: By setting an integrated mounting bracket with a hollow area, the oil fumes located outside the mounting bracket can pass through the hollow area and enter the space enclosed by the mounting bracket, shortening the path of these oil fumes into the fan and increasing the amount of oil fumes entering the fan; the reasonable setting of the edge of the hollow area on the two second arms and the center angle of the air inlet can gather the upward-entering oil fumes into the upper box before entering the air inlet, accelerating the flow into the air inlet, thereby improving the oil fume extraction effect; the above effects do not require a separate flow guide component, but are achieved by utilizing the fan's mounting bracket, saving on component setup and installation, and simplifying the structure and flow field; in addition, since the second arm is located upstream of the fan, it can break up the vortex of the disordered oil fume airflow, improving airflow efficiency and reducing noise. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a range hood according to an embodiment of the present utility model;

[0023] Figure 2 This is a cross-sectional view (front and rear section) of the range hood according to an embodiment of the present utility model;

[0024] Figure 3 This is a cross-sectional view (left-right section) of the range hood according to an embodiment of the present utility model;

[0025] Figure 4 This is a three-dimensional structural diagram of the fan system of the range hood according to an embodiment of the present utility model;

[0026] Figure 5 This is a front view of the fan system of the range hood according to an embodiment of the present utility model;

[0027] Figure 6 This is a schematic diagram of the mounting bracket for the fan system of the range hood according to an embodiment of the present utility model;

[0028] Figure 7 This is a schematic diagram of an alternative embodiment of the mounting bracket for the fan system of the range hood according to an embodiment of the present invention. Detailed Implementation

[0029] The technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0030] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or server that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0031] Various exemplary embodiments, features, and aspects of this disclosure will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0032] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0033] In this document, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Furthermore, the term "at least one" in this document means any combination of at least two of any one or more elements. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C.

[0034] The specific angles, heights, widths, and other values ​​given in the following detailed embodiments are all measured in accordance with the specific accompanying drawings.

[0035] Furthermore, to better illustrate this disclosure, numerous specific details are set forth in the following detailed description. Those skilled in the art will understand that this disclosure can be practiced without certain specific details. In some instances, methods, means, components, and circuits well known to those skilled in the art have not been described in detail in order to highlight the main points of this disclosure.

[0036] See Figures 1-6A range hood includes an upper housing 1, a smoke collection box 2 connected below the upper housing 1, and a fan system 3. The smoke collection box 2 has a smoke inlet 21 (not limited to the marked position, but can also be a conventional top-suction smoke inlet or side-suction smoke inlet), and the upper housing 1 and the smoke collection box 2 are in fluid communication.

[0037] The fan system 3 includes a fan 31 and a mounting bracket 32, which is used to install the fan 31 inside the upper housing 1. Oil fumes enter the range hood from the smoke inlet 21 of the smoke collection box 2 and flow upwards into the upper housing 1, where they are then discharged outside the range hood by the fan 31.

[0038] The fan 31 may be a centrifugal fan, which includes a volute 311, an impeller 312 disposed within the volute 311, and a motor 313 for driving the impeller 312 to rotate. The output ends of the impeller 312 and the motor 313 are fixed together by a fastening nut 316. An air inlet 314 is formed on the volute 311. There may be one or two air inlets 314. When there are two, they are preferably oriented towards the front and rear sides of the range hood, respectively ("front side" refers to the side of the range hood that is closer to the user when the range hood is installed, and "rear side" refers to the side of the range hood that is farther away from the user and closer to the wall where the range hood is installed when the range hood is installed).

[0039] An annular collector 315 is provided at the air inlet 314, and the collector 315 adopts existing technology. The collector 315 includes a radial guide portion 3151, an axial guide portion 3152 extending axially from the radially inner edge of the radial guide portion 3151 into the volute 311 along the impeller 312 axis, and a mounting portion 3153 extending radially outward from the radially outer edge of the radial guide portion 3151. The radial guide portion 3151 may be convex outward from the volute 311. The mounting portion 3153 is used to fix the cover plate of the volute 311.

[0040] The structure of the fan 31 is the same as that of the prior art, and will not be described in detail here.

[0041] The mounting bracket 32 ​​is connected between the volute 311 and the upper housing 1. In this embodiment, the upper housing 1 includes a rear sidewall 11, which is opposite to the rearward-facing air inlet 314. The mounting bracket 32 ​​is disposed between the rear side of the volute 311 and the rear sidewall 11 of the upper housing 1. The mounting bracket 32 ​​is connected to the volute 311 below the air inlet 314 and close to the bottom of the volute 311. Alternatively, the mounting bracket 32 ​​can also change its position depending on the orientation of the air inlet 314. When there is one air inlet 314, the mounting bracket 32 ​​corresponds to that air inlet 314. When there are two air inlets 314, the mounting bracket 32 ​​corresponds to one of the air inlets 314, especially the main air inlet (the air inlet 314 on the side away from the motor 313). The air inlets 314 mentioned below all refer to the air inlets corresponding to the mounting bracket 32, and not the air inlets located on the side of the volute 31 away from the mounting bracket 32.

[0042] The mounting bracket 32 ​​includes an integrally formed first arm 321 and a second arm 322, the first arm 321 extending along the width direction of the volute 311. Figure 5 (As shown in the left and right directions), the first arm 321 is fixedly attached to the volute 311. There are two second arms 322, which extend from both ends of the extension direction of the first arm 321 away from the volute 311. The distance between the two second arms 322 increases as they move away from the volute 311, so that the mounting bracket 32 ​​is in the shape of a horizontal bridge.

[0043] The mounting bracket 32 ​​is arranged within the channel through which the fumes pass, and its second arm 322 is located upstream of the air inlet 314 along the fume flow path. Thus, the second arm 322 of the mounting bracket 32 ​​can break up the disordered airflow drawn in from the fume inlet 21 of the fume collection box 2, improving airflow efficiency and reducing noise. Simultaneously, the inclined second arm 322 also acts as a guide, accelerating the airflow towards the center of the air inlet 314 of the fan 31, thereby facilitating rapid exhaust. The vertical dimension of the second arm 322 gradually decreases from the end furthest from the first arm 321 towards the end closest to the first arm 321 (non-uniform cross-section), further accelerating the airflow towards the center of the air inlet 314 of the fan 31. In this example, the non-uniform cross-section is formed by the top of the second arm 322 gradually sloping downwards towards the first arm 321 from the direction furthest from the first arm 321, and the bottom of the second arm 322 gradually sloping upwards towards the first arm 321 from the direction furthest from the first arm 321.

[0044] The horizontal distance between the ends of the two second arms 322 that are far away from the first arm 321 is H2, and the mounting surface dimension of the upper housing 1 is H0. The mounting surface is the surface that is parallel to the width direction of the volute 311. The relationship between H2 and H0 satisfies H2≤H0 to ensure that the fan 31 with the mounting bracket 32 ​​can be placed into the upper housing 1 from the front side. Usually, a removable front cover plate is provided on the front side of the upper housing 1 for the installation of the fan 31.

[0045] The volute 311 includes a first cover plate 3111, a second cover plate 3112, and an annular wall 3113 disposed between the first cover plate 3111 and the second cover plate 3112. The air inlet 314 is formed on the first cover plate 3111 and / or the second cover plate 3112. The first arm 321 has a certain contact area with the corresponding cover plate of the volute 311 (in this embodiment, the first cover plate 3111, on which the air inlet 314 is formed as the main air inlet). The vertical projection area of ​​the overlapping portion of the first arm 321 and the corresponding cover plate of the volute 311 on a vertical plane perpendicular to the central axis X of the impeller 312 is S1, and the vertical projection area of ​​the first arm 321 on the vertical plane perpendicular to the central axis X of the impeller 312 is S2, and satisfies 2≤S1 / S2≤3.5. In this embodiment, the vertical plane is parallel to the rear side wall 11 of the upper housing 1, and the projection direction is shown in the figure. Figure 2 As shown by arrow F1, the lower limit of this ratio ensures sufficient contact area between the first arm 321 and the volute 311; otherwise, the fan 31 would be unstable when there is only one mounting bracket 32. The upper limit of this ratio ensures that the edges (outer peripheral edges of the covers) of the corresponding cover plates of the first arm 321 and the volute 311 can have more contact, that is, the overlapping part of the volute edge accounts for a larger proportion, thereby increasing the installation strength and overall reliability.

[0046] The bottom edge of the first arm 321 of the mounting bracket 32 ​​is lower than the lowest point of the corresponding cover plate of the volute 311. The horizontal distance between the bottom edge of the first arm 321 and the lowest point of the corresponding cover plate of the volute 311 is H1, and H1≤10mm is satisfied. This further ensures that the edges of the first arm 321 and the corresponding cover plate of the volute 311 can have more contact, thereby ensuring the overall installation strength. The top edge of the first arm 321 and the corresponding cover plate of the volute 311 have two intersection points, M and N, which are located on the same horizontal line. The horizontal distance between the two intersection points MN is d. The maximum width of the volute 311 is D, and 1.4≤D / d≤2.8 is satisfied. This constrains the installation overlap surface of the mounting bracket 32 ​​and the volute 31, thereby ensuring the overall installation stability after the mounting bracket 32 ​​and the volute 31 are fixed. The lower limit of this ratio ensures sufficient contact area between the first arm 321 and the volute 311; otherwise, the fan 31 will be unstable when there is only one mounting bracket 32. The upper limit of this ratio ensures that the edges of the corresponding cover plates of the first arm 321 and the volute 311 can have more contact, that is, the overlapping part of the volute edge accounts for a larger proportion, thereby increasing the installation strength and overall reliability.

[0047] Furthermore, the thickness H0-H2 ≤ 30mm is satisfied to ensure that after the fan 31 is installed, the edge of the mounting bracket 32 ​​can connect with the folded edge 312 of the relatively strong edge of the upper housing 1, thereby improving the overall fixing strength and reliability and avoiding vibration and noise problems caused by weak mounting surfaces. In this embodiment, the folded edge 312 is formed on both sides along the width direction of the volute 311, that is, on the left and right sides of the upper housing 1. It can be formed on the left and right side walls of the upper housing 1, or on the rear side wall 11 of the upper housing 1. Each folded edge 312 corresponds to a second arm 322. The second arm 322 and the folded edge 312 can be detachably connected.

[0048] Each second arm 322 has a perforated area 323 located below the air inlet 314. Along the extension direction of the second arm 322, the diameter (vertical dimension) of the perforated area 323 gradually decreases from a position away from the first arm 321 towards the first arm 321. Since the first arm 321 corresponds to the center of the air inlet 314, the change in the diameter of the perforated area 323 can pre-collect the oil fumes entering the upper chamber 1 from the smoke collection box 2, thereby increasing the oil fume flow velocity as the diameter decreases, accelerating the flow into the air inlet 314, and thus improving the oil fume extraction effect. Figure 6 As shown, the cross-section of the hollowed-out area 323 is trapezoidal; alternatively, see [reference needed]. Figure 7The cross-section of the hollow area 323 can also be triangular. Preferably, the two second arms 322 are symmetrical with respect to the first arm 321, and the two hollow areas 323 are also symmetrical with respect to the first arm 321. Oil fumes can pass through the hollow areas 323 at the corresponding positions from the outside of the mounting bracket 32 ​​(the left and right sides in this embodiment) and enter the area between the two second arms 322.

[0049] On the inner surface of the second arm 322 facing the other second arm 322, the hollow area 323 on one of the second arms 322 has a first inner midpoint A (midpoint in the vertical direction) on its inner edge 3231 near the first arm 321, and a first outer midpoint B (midpoint in the vertical direction) on its outer edge 3232 away from the first arm 321. The hollow area 323 on the other second arm 322 has a second inner midpoint A' (midpoint in the vertical direction) on its inner edge 3231, and a second outer midpoint B' (midpoint in the vertical direction) on its outer edge 3232. When the hollow area 323 is triangular, the first inner midpoint A and the second inner midpoint A' are the vertices of the triangle. Since the mounting bracket 32 ​​itself is very thin, generally not exceeding 1mm, the aforementioned midpoints can be points on the large plane of the mounting bracket 32 ​​(the plane on which the second arms 322 of the two mounting brackets are close to or far from each other), or points on the theoretically intermediate plane of the large plane of the mounting bracket 32.

[0050] The shortest distance from the first inner midpoint A to the radial outer edge of the radial guide section 3151 of the collector 315 is d, the shortest distance from the second inner midpoint A' to the radial outer edge of the radial guide section 3151 of the collector 315 is d', the shortest distance from the first outer midpoint B to the radial outer edge of the radial guide section 3151 of the collector 315 is e, and the shortest distance from the second outer midpoint B' to the radial outer edge of the radial guide section 3151 of the collector 315 is e'. The above parameters satisfy the following relationship: 1.2≤e / d≤2, 1.2≤e' / d'≤2. This makes the oil fumes entering the air inlet 314 through the hollow area 323 more evenly distributed in this path, while shortening the path of oil fumes from the hollow area 323 to the air inlet 314.

[0051] The orthographic projection of one of the inner edges 3231 of the two hollowed-out areas 323 onto the horizontal plane (see projection direction). Figure 5 Arrow F2) shown falls within the orthographic projection of the air inlet 314 of the fan 31 onto the horizontal plane. The projection edge of the air inlet 314 is shown by dashed lines M1 and M2. Within the same horizontal projection plane, the minimum distance from the inner edge 3231 to the center of the air inlet 314 of the fan 31 is L1, and L1 is 45mm.

[0052] The orthographic projection of one of the inner edges 3231 of the two hollow areas 323 onto the horizontal plane falls outside the orthographic projection of the air inlet 314 of the fan 31 onto the horizontal plane. Within the same horizontal projection plane, the minimum distance between the inner edge 3231 and the center of the air inlet 314 of the fan 31 is L2, and L2 satisfies 105mm.

[0053] Since the mounting bracket 32 ​​itself is very thin, generally not exceeding 1mm, when calculating L1 and L2 above, the point on the inner edge 3231 can be a point on the large plane of the mounting bracket 32 ​​(the plane on which the second arms 322 of the two mounting brackets 32 are close to or far from each other), or it can be a point on the theoretical middle plane of the large plane of the mounting bracket 32.

[0054] By constraining the cutout position by the above-mentioned dimensions, it is ensured that the interior of the cutout area 323 does not overlap with the corresponding cover plate surface of the volute 31, and that the cutout area 323 is on the two second arms 322 of the mounting bracket 32. Compared with the structure of the cutout area 323 on the first arm 321, the structure of this utility model has higher structural strength.

[0055] The impeller 312 has a central point O at the intersection of its central axis X and the outer surface of the fastening nut 316 (the surface facing the air inlet 314 of the first cover plate 3111). The line connecting the first inner midpoint A and the central point O is the first connecting line, and the line connecting the second inner midpoint A' and the central point O is the second connecting line OA'. The first connecting line OA' and the second connecting line OA' have a first included angle α. The line connecting the first outer midpoint B and the central point O is the third connecting line OB, and the line connecting the second outer midpoint B' and the central point O is the fourth connecting line OB'. The third connecting line OB' and the fourth connecting line OB' have a second included angle β. The relationship between the two included angles satisfies: 45°≤α≤70°, 75°≤β≤90°, or 4°≤β-α≤20°. Here, α constrains the relative relationship between the two inner midpoints, β constrains the relative relationship between the two outer midpoints, and the difference between the two satisfies the requirement of having a hollow area 323 in the middle. The reasonable setting of the edge of the hollow area 323 on the two second arms 322 and the center angle of the air inlet 314 can gather the air entering the upper box 1 before entering the air inlet 314, accelerate the flow into the air inlet, and thus improve the oil fume extraction effect.

[0056] Draw a straight line L perpendicular to the horizontal plane through point O (the projection of the center of the air inlet 314 on the horizontal plane lies on this straight line L). The third angle between the first connecting line OA and the straight line L is α1 (an acute angle), and the fourth angle between the second connecting line OA' and the straight line L is α2 (an acute angle), satisfying α2>α1, and more preferably 1.2≤α2 / α1≤2. Since the volute 311 basically adopts an eccentric structure, based on the installation stability requirements of the mounting bracket 32, the above angle ratio actually constrains the fixed installation position of the mounting bracket 32 ​​and the volute 311. By limiting the above size and ratio relationship, the mounting bracket 32 ​​can balance and support the volute 311 so that the side with the larger area has more contact area with the mounting bracket 32, while the side with the smaller area has a relatively smaller contact area with the mounting bracket 32.

[0057] See Figure 6 and Figure 7 The mounting bracket 32 ​​has flanges 324 on its upper and lower sides, respectively, on the first arm 321 and the second arm 322. The width of the flanges 324 gradually decreases from the ends of the second arms 322 away from the first arm 321 towards the middle of the first arm 321. The angles between the flanges 324 and the first arm 321, and between the flanges 324 and the second arm 322, are both greater than 90°, thus effectively improving the overall structural strength of the mounting bracket 32. The non-uniform width cross-section of the second arm 322 allows the oil to converge along the surface of the second arm 322 to the bottom flange 324, and then flow along the flange 324 to the position corresponding to the end of the second arm 322 away from the first arm 321. That is, the oil flows along the bottom inclined flange to the lowest point where the upper housing 1 is installed, thereby reducing the risk of oil circuit problems in the entire machine.

[0058] The term "fluid connectivity" as used in this utility model refers to the spatial relationship between two components or parts (hereinafter referred to as the first part and the second part, respectively), that is, a fluid (gas, liquid, or a mixture of both) can flow from the first part along a flow path and / or be transported to the second part. This can be a direct connection between the first part and the second part, or an indirect connection between the first part and the second part through at least one third party. The third party can be a fluid channel such as a pipe, channel, conduit, guide, hole, or groove, or a chamber or combination thereof that allows fluid to flow through.

Claims

1. A range hood, comprising an upper housing (1) and a fan system (3), wherein the fan system (3) comprises: A fan (31) includes a volute (311), an impeller (312) disposed within the volute (311), a motor (313) for driving the impeller (312) to rotate, and a fastening nut (316) for fixing the output ends of the impeller (312) and the motor (313). The impeller (312) has a center point (O) where its central axis (X) intersects the outer surface of the fastening nut (316). An air inlet (314) is provided on the volute (311). Mounting bracket (32) for mounting the fan (31) inside the upper housing (1); characterized in that: The mounting bracket (32) is installed on the volute (311) below the air inlet (314). The mounting bracket (32) includes an integrally formed first arm (321) and a second arm (322). The first arm (321) extends along the width direction of the volute (311) and is fixed to the volute (311). There are two second arms (322) and they extend from both ends of the extension direction of the first arm (321) away from the volute (311). The end of the second arm (322) away from the first arm (321) is connected to the upper housing (1). In the oil fume flow path, the second arm (322) is located upstream of the fan (31); each second arm (322) has a hollow area (323), and the inner edge (3231) of the hollow area (323) of one second arm (322) near the first arm (321) has a first inner midpoint (A) in the vertical direction, while the outer edge (3232) of the same hollow area (323) away from the first arm (321) has a first inner midpoint (A) in the vertical direction. One outer midpoint (B); the inner edge (3231) of the hollow area (323) of another second arm (322) near the first arm (321) has a second inner midpoint (A') in the vertical direction, while the outer edge (3232) of the same hollow area (323) away from the first arm (321) has a second outer midpoint (B') in the vertical direction; each midpoint is located on the inner surface of the corresponding second arm (322) facing the other second arm (322); The line connecting the first inner midpoint (A) and the center point (O) is the first line (OA), the line connecting the second inner midpoint (A') and the center point (O) is the second line (OA'), the line connecting the first outer midpoint (B) and the center point (O) is the third line (OB), and the line connecting the second outer midpoint (B') and the center point (O) is the fourth line (OB'). The first line (OA) and the second line (OA') have a first included angle α, and the third line (OB) and the fourth line (OB') have a second included angle β. The relationship between the two included angles satisfies: 45°≤α≤70°, 75°≤β≤90°; or the relationship between the two included angles satisfies: 4°≤β-α≤20°.

2. The range hood according to claim 1, characterized in that: Draw a straight line (L) perpendicular to the horizontal plane through the center point (O). The third angle between the first connecting line (OA) and the straight line (L) is α1, and the fourth angle between the second connecting line (OA') and the straight line (L) is α2, and α2 > α1.

3. The range hood according to claim 2, characterized in that: α1 and α2 also satisfy the following relationship: 1.2≤α2 / α1≤2.

4. The range hood according to claim 1, characterized in that: A collector (315) is provided at the air inlet (314). The collector (315) includes a radial guide section (3151). The shortest distance from the first inner midpoint (A) to the radial outer edge of the radial guide section (3151) of the collector (315) is d. The shortest distance from the second inner midpoint (A') to the radial outer edge of the radial guide section (3151) of the collector (315) is d'. The shortest distance from the first outer midpoint (B) to the radial outer edge of the radial guide section (3151) of the collector (315) is e. The shortest distance from the second outer midpoint (B') to the radial outer edge of the radial guide section (3151) of the collector (315) is e'. The parameters satisfy the following relationship: 1.2≤e / d≤2, 1.2≤e' / d'≤2.

5. The range hood according to claim 4, characterized in that: The cross-section of the hollow area (323) is triangular, with the first inner midpoint (A) and the second inner midpoint (A') being the vertices of the triangle.

6. The range hood according to claim 1, characterized in that: The distance between the two second arms (322) increases as they move further away from the volute (311), so that the mounting bracket (32) is generally in the shape of a horizontal bridge.

7. The range hood according to claim 6, characterized in that: Along the extension direction of the second arm (322), the size of the hollow area (323) in the vertical direction gradually decreases from a position away from the first arm (321) toward the first arm (321).

8. The range hood according to any one of claims 1 to 6, characterized in that: The first arm (321) and the second arm (322) of the mounting bracket (32) are respectively provided with flanges (324) on the upper and lower sides.

9. The range hood according to any one of claims 1 to 6, characterized in that: The dimension of the second arm (322) in the vertical direction gradually decreases from the end away from the first arm (321) to the end closer to the first arm (321).

Images