Range hood

Abstract

The utility model discloses a range hood, which comprises a fan system, the fan system comprises a fan, the fan comprises a volute and an impeller arranged in the volute, and the volute is provided with an air inlet; the mounting bracket is used for mounting a fan; the installation support is installed at the position, located below the air inlet, of the volute and comprises a first arm, the first arm extends in the width direction of the volute and is tightly attached to and fixed to the volute, and the vertical projection area of the overlapped part of the first arm and the corresponding side of the volute on the vertical plane perpendicular to the central axis of the impeller is S1, the vertical projection area of the first arm on a vertical plane perpendicular to the central axis of the impeller is S2, and the following relation is met: S1 / S2 is larger than or equal to 2 and smaller than or equal to 3.5.

Description

Technical Field

[0001] This utility model relates to an oil fume purification device, and more particularly to an oil fume extractor. Background Technology

[0002] Range hoods have become an indispensable kitchen appliance in modern homes. Currently, range hoods come in various forms, including side-draft and top-draft types.

[0003] For top-mounted or side-mounted range hoods, the fan is positioned above the air inlet (smoke inlet), and cooking fumes rise from the bottom and enter the fan. To install the fan, volute supports are typically installed on both sides of the volute's width to secure it to the fan frame. For example, Chinese Patent Application No. 201710305856.3 discloses a range hood volute structure where a front volute plate structure and a rear volute plate structure interlock to form the basic frame structure of the volute. The volute supports are installed at the position of maximum volute helixity to provide fixation.

[0004] To fit cabinets or for other reasons, the size of the fan frame needs to be changed, especially reducing its width. This reduces the space between the volute and the sides of the fan frame, resulting in insufficient space for mounting brackets. If a single mounting bracket is used, ensuring sufficient installation strength and stability becomes a critical issue that needs to be addressed. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a range hood that reduces the space required for fan installation while ensuring sufficient installation strength and stability, in order to address the shortcomings of the existing technology.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problem is as follows: a range hood, including a fan system, wherein the fan system includes:

[0007] A fan, comprising a volute and an impeller disposed within the volute, the volute having an air inlet; and

[0008] Mounting bracket for mounting the fan; characterized in that:

[0009] The mounting bracket is installed on the volute below the air inlet. The mounting bracket includes a first arm that extends along the width of the volute and is fixed to the volute. The vertical projection area of ​​the overlapping part of the first arm and the corresponding side of the volute on a vertical plane perpendicular to the central axis of the impeller is S1, and the vertical projection area of ​​the first arm on a vertical plane perpendicular to the central axis of the impeller is S2, and the following relationship is satisfied: 2≤S1 / S2≤3.5.

[0010] The mounting bracket is placed below the air inlet, limiting the projected area of ​​the connection between the mounting bracket and the volute. The lower limit of the area ratio ensures sufficient contact area between the first arm and the volute; otherwise, the fan installation will be unstable with only one mounting bracket. The upper limit of the area ratio ensures that the edges of the first arm and the corresponding cover plate of the volute can have more contact, that is, the overlapping part of the volute edge has a larger proportion, thereby increasing the installation strength and overall reliability.

[0011] To further ensure that the first arm can have more contact with the corresponding edge of the volute, thereby ensuring the overall installation strength, the bottom edge of the first arm of the mounting bracket is lower than the lowest point of the corresponding side of the volute.

[0012] Preferably, the horizontal distance between the bottom edge of the first arm and the lowest point of the corresponding side of the volute is H1, and H1 ≤ 10 mm.

[0013] To facilitate fan installation, the range hood also includes an upper housing, and the mounting bracket includes two second arms extending from both ends of the first arm away from the volute. The ends of the second arms away from the first arm are connected to the upper housing. Furthermore, the second arms can break up vortices in the passing, disordered oil fume airflow, improving airflow efficiency and reducing noise.

[0014] Furthermore, the distance between the two second arms increases as they move further away from the volute, resulting in the overall mounting bracket taking on a horizontal bridge shape. The inclined second arms also serve a certain guiding function, accelerating the airflow towards the center of the fan's inlet for rapid discharge.

[0015] Furthermore, the horizontal distance between the ends of the two second arms that are far from the first arm is H2, and the mounting surface dimension of the upper housing is H0. H2 and H0 satisfy the following relationship: H2≤H0, thereby ensuring that the fan with the mounting bracket can be placed into the upper housing from the front side.

[0016] Furthermore, H2 and H0 also satisfy the following relationship: H0-H2≤30mm, to ensure that after the fan is installed, the edge of the mounting bracket can be connected to the folded edge of the upper casing with relatively high strength, thereby improving the overall fixing strength and reliability and avoiding vibration and noise problems caused by the weak mounting surface.

[0017] Furthermore, in the oil fume flow path, the second arm is located upstream of the fan; each second arm has a hollow area, and along the extension direction of the second arm, the size of the hollow area in the vertical direction gradually decreases from the position away from the first arm towards the first arm. By setting the hollow area, 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; since the first arm corresponds to the center of the air inlet, the change in the diameter of the hollow area creates a Venturi effect, which can gather the oil fumes entering the upper box in advance, so that the oil fume flow velocity increases as the diameter decreases, accelerating the flow into the air inlet, thereby improving the oil fume extraction effect; the above effect does not require a separate guide component, but is achieved by utilizing the fan's mounting bracket, saving the setting and installation of components and simplifying the structure and flow field.

[0018] Preferably, to ensure the stability of the mounting bracket and the volute after installation, the top edge of the first arm and the corresponding side of the volute have two intersection points, the two intersection points are located on the same horizontal line, the horizontal distance between the two intersection points is d, the maximum width of the volute is D, and it satisfies 1.4≤D / d≤2.8.

[0019] Preferably, the volute includes a first cover plate, a second cover plate, and an annular wall disposed between the first cover plate and the second cover plate. The air inlet is disposed on the first cover plate and / or the second cover plate. The mounting bracket is fixed to one of the cover plates with the air inlet. The corresponding side of the volute is the corresponding cover plate for fixing the mounting bracket.

[0020] Compared with the prior art, the advantages of this utility model are as follows: the mounting bracket is set below the air inlet, which limits the projected area of ​​the connection between the mounting bracket and the volute. The lower limit of the area ratio ensures that there is sufficient contact area between the first arm and the volute. Otherwise, the fan installation will be unstable when there is only one mounting bracket. The upper limit of the area ratio ensures that the edges of the first arm and the corresponding cover plate of the volute 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. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a range hood according to an embodiment of the present utility model;

[0022] 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;

[0023] Figure 3 This is a cross-sectional view (left-right section) of the range hood according to an embodiment of the present utility model;

[0024] Figure 4This is a three-dimensional structural diagram of the fan system of the range hood according to an embodiment of the present utility model;

[0025] Figure 5 This is a front view of the fan system of the range hood according to an embodiment of the present utility model;

[0026] 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. Detailed Implementation

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] The specific angles, heights, widths, and other values ​​given in the following detailed embodiments are all measured in accordance with the specific accompanying drawings.

[0033] 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.

[0034] See Figures 1-6 A 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.

[0035] 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.

[0036] 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).

[0037] 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.

[0038] The structure of the fan 31 is the same as that of the prior art, and will not be described in detail here.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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 smoke extraction effect. Preferably, the two second arms 322 are symmetrical with respect to the first arm 321, and the two perforated areas 323 are also symmetrical with respect to the first arm 321. Oil fumes can pass through the perforated areas 323 at corresponding positions from the outside of the mounting bracket 32 ​​(left and right sides in this embodiment) and enter the area between the two second arms 322.

[0047] Flanges 324 are provided on the upper and lower sides of the first arm 321 and the second arm 322 of the mounting bracket 32. 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°, thereby 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.

[0048] 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 a fan system (3), the fan system (3) comprising: a fan (31) comprising a volute (311) and an impeller (312) disposed in the volute (311), the volute (311) being provided with an air inlet (314); and a mounting bracket (32) for mounting the fan (31); characterized in that: the mounting bracket (32) is mounted at a position of the volute (311) below the air inlet (314), the mounting bracket (32) comprises a first arm (321) extending along a width direction of the volute (311) and fixedly attached to the volute (311), a vertical projection area of a coincident portion of the first arm (321) and the corresponding side of the volute (311) on a vertical plane perpendicular to a central axis (X) of the impeller (312) is S1, a 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 the following relationship is satisfied: 2≤S1 / S2≤3.

5.

2. The hood according to claim 1, characterized in that: a bottom edge of the first arm (321) is lower than a lowest point of the corresponding side of the volute (311).

3. The hood according to claim 2, characterized in that: a horizontal distance between the bottom edge of the first arm (321) and the lowest point of the corresponding side of the volute (311) is H1, and H1≤10mm is satisfied.

4. The hood according to claim 1, characterized in that: the range hood further comprises an upper cabinet (1), the mounting bracket (32) further comprises a second arm (322), the second arm (322) has two and extends away from the volute (311) from both ends of the extension direction of the first arm (321) respectively, and an end of the second arm (322) away from the first arm (321) is connected to the upper cabinet (1).

5. The hood according to claim 4, characterized in that: a distance between the two second arms (322) increases away from the volute (311), so that the mounting bracket (32) as a whole has a horizontally placed bridge shape.

6. The hood according to claim 4, characterized in that: a horizontal distance between the ends of the two second arms (322) away from the first arm (321) is H2, a mounting surface size of the upper cabinet (1) is H0, and H2 and H0 satisfy the following relationship: H2≤H0.

7. The hood according to claim 6, characterized in that: H2 and H0 satisfy the following relationship: H0-H2≤30mm.

8. The hood according to claim 4, characterized in that: on an oil fume flow path, the second arm (322) is located upstream of the fan (31); a hollowed-out area (323) is formed on each second arm (322), and along the extension direction of the second arm (322), a size of the hollowed-out area (323) in the up-down direction gradually decreases from a position away from the first arm (321) towards the first arm (321).

9. The hood according to claim 1, characterized in that: a top edge of the first arm (321) has two intersection points with the corresponding side of the volute (311), the two intersection points are located on the same horizontal line, a horizontal distance between the two intersection points is d, a maximum width of the volute (311) is D, and 1.4≤D / d≤2.8 is satisfied.

10. The hood according to any one of claims 1-9, characterized in that: The volute (311) comprises a first cover plate (3111), a second cover plate (3112) and a ring wall (3113) arranged between the first cover plate (3111) and the second cover plate (3112), the air inlet (314) is arranged on the first cover plate (3111) and / or the second cover plate (3112), the mounting bracket (32) is fixed with one of the cover plates provided with the air inlet (314), and the corresponding side of the volute (311) is the corresponding cover plate fixed with the mounting bracket (32).

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