Range hood

Abstract

The utility model discloses a range hood which comprises a shell and a fan system at least partially arranged in the shell, a first air inlet is formed in the front side of the shell, the shell is provided with a first center line in the left-right direction, and the fan system comprises a second air inlet facing the first air inlet. The first air inlet and the second air inlet are both offset relative to the first center line, and the offset directions of the first air inlet and the second air inlet are opposite. Compared with the prior art, the range hood has the advantages that the air inlet on the shell and the air inlet of the fan are reversely offset relative to the center line of the whole range hood, so that the non-uniform flow caused by the offset of the fan can be reduced, the air inlet uniformity of the left side and the right side of the whole range hood can be improved, and the noise and the shaking can be further reduced.

Description

Technical Field

[0001] The utility model relates to an oil fume purification device, in particular to an oil fume extractor. Background Art

[0002] Range hoods have become one of the indispensable kitchen appliances in modern families. Usually, range hoods include top suction type and side suction type. Side suction range hoods use the principle of vortex wind pressure to absorb most of the oil smoke close to the stove in an arc form, which can reduce the adverse effects on human health. In addition, the power source is close to the stove, which basically does not reduce the suction effect of the power source.

[0003] A side-suction large-volume center-mounted range hood, as disclosed in the Chinese patent application number 201910886307.9 of the present applicant. For this type of range hood, due to limitations such as the size of the fan and the cabinet installation structure, the fan system must be installed offset to ensure that the air outlet (air outlet hood) does not interfere with the cabinet wall. However, due to the offset of the fan system, the air inlet of the fan system is not centrally located, resulting in uneven air volume distribution on the left and right sides of the range hood inlet, and a difference in the oil fume suction effect on the left and right sides, making the oil fume suction effect on one side worse than the other, reducing the exhaust efficiency. The asymmetry of the oil fume suction amount on the left and right sides increases the shaking of the impeller, and the probability of vibration and abnormal noise of the range hood increases.

[0004] In order to solve the problem of poor fume extraction effect caused by uneven flow of the range hood on the side-suction large-volume center-mounted range hood, some range hoods are currently equipped with a flow distribution structure. When cooking on one side, the air inlet on the other side is closed to improve the extraction effect, as disclosed in the Chinese patent application number 201821407416.5 of the applicant.

[0005] This solution has the following drawbacks:

[0006] 1. The traffic distribution structure is complex and the cost is high;

[0007] 2. It is set in the oil circuit structure, which is difficult to clean.

[0008] 3. The flow distribution relies on reducing the air inlet area and increasing the wind speed on one side to ensure the oil fume absorption effect, but it does not solve the problem of the uniformity of the air intake on the left and right sides, nor does it solve the shaking caused by the asymmetric suction of oil fume on the left and right sides. Utility Model Content

[0009] The technical problem to be solved by the utility model is to provide a range hood for the above-mentioned deficiencies in the prior art, which improves the uniformity of air intake on the left and right sides and reduces noise and shaking.

[0010] The utility model solves the above technical problems by adopting the following technical solution: a range hood, comprising a housing and a fan system at least partially arranged in the housing, a first air inlet is formed on the front side of the housing, the housing has a first center line in the left-right direction, the fan system comprises a second air inlet facing the first air inlet, and is characterized in that:

[0011] The first air inlet and the second air inlet are both offset relative to the first center line, and the offset directions of the first air inlet and the second air inlet are opposite.

[0012] By making the air inlet on the shell and the air inlet of the fan in opposite directions relative to the center line of the range hood, the uneven flow caused by the fan offset can be reduced, the uniformity of the air intake on the left and right sides of the whole machine can be improved, and the noise and shaking can be reduced.

[0013] Preferably, the second air inlet has an air inlet area S corresponding to the left side of the first center line. 1 The air inlet area of ​​the second air inlet corresponding to the right side of the first center line is S 2 , the air inlet area of ​​the first air inlet corresponding to the left side of the first center line is K1, the air inlet area of ​​the first air inlet corresponding to the right side of the first center line is K2, and it satisfies: This can make the air intake areas on the left and right sides of the whole machine equal, and then make the air intake volumes on the left and right sides equal, ensuring uniform air intake.

[0014] Preferably, the first air inlet has a second center line in the left-right direction, the second air inlet has a center, and the second center line and the center are respectively located on opposite sides of the first center line.

[0015] According to one aspect of the utility model, the first air inlet is rectangular, and the second air inlet is circular.

[0016] Preferably, to ensure uniform airflow on the left and right sides, the horizontal distance from the center to the first center line is L, the radius of the second air inlet is R, the horizontal distance between the second center line and the first center line is d, and the following relationship is satisfied:

[0017]

[0018] Wherein D is the length of the first air inlet, and h is the width of the first air inlet.

[0019] According to another aspect of the utility model, the lower edge and the left and right edges of the first air inlet are straight lines, the upper edge of the first air inlet is a curve, and the second air inlet is circular.

[0020] Preferably, to ensure uniform air intake on the left and right sides, the air intake area of ​​the second air inlet corresponding to the left side of the first center line is S 1 The air inlet area of ​​the second air inlet corresponding to the right side of the first center line is S 2 ,

[0021] A coordinate system is established with the lower edge of the first air inlet as the X-axis and the first center line as the Y-axis, the center is located in the first quadrant of the coordinate system, the upper edge of the first air inlet is a continuous curve and the profile function is f(x), the original function of f(x) is F(x), and the following relationship is satisfied:

[0022]

[0023] Wherein D is the length of the first air inlet, and d is the horizontal coordinate of the second center line.

[0024] Preferably, an air outlet cover is provided at the air outlet of the fan system, and the air outlet cover is offset relative to the first center line, and the offset direction is opposite to the offset direction of the second air inlet of the fan system.

[0025] Furthermore, in order to avoid oil smoke backflow when shutting down and to improve the smoke collection effect during operation, the range hood also includes a smoke baffle that can be flipped to open and close the first air inlet.

[0026] Furthermore, in order to improve the oil separation effect, a first filter is provided at the first air inlet, and a second filter is provided at the second air inlet.

[0027] Compared with the prior art, the advantage of the utility model is that by making the air inlet on the shell and the air inlet of the fan in the opposite direction relative to the center line of the range hood, the uneven flow caused by the fan offset can be reduced, the uniformity of the air intake on the left and right sides of the whole machine can be improved, and the noise and shaking can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of a range hood according to a first embodiment of the utility model;

[0029] Figure 2 This is a schematic diagram of a hidden smoke baffle of a range hood according to a first embodiment of the utility model;

[0030] Figure 3 for Figure 2 Schematic diagram of the decomposition structure;

[0031] Figure 4 This is a schematic diagram of a range hood with a hidden smoke baffle, an oil guide plate and a filter screen in the first embodiment of the utility model;

[0032] Figure 5 Schematic diagram of a range hood with hidden smoke baffle, oil guide plate and filter screen in the second embodiment of the utility model DETAILED DESCRIPTION

[0033] Embodiments of the present utility model are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions.

[0034] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present utility model 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. Since the embodiments disclosed in the present utility model can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0035] Embodiment 1

[0036] See also Figure 1 to Figure 4 A range hood is a side suction range hood, comprising a housing 1, a fan system 2 at least partially disposed in the housing 1, and an air outlet hood 3 disposed outside the housing 1. The fan system 2 is a centrifugal fan, and the air outlet hood 3 is disposed at an air outlet of the fan system 2.

[0037] A first air inlet 11 is formed on the front side of the housing 1, and the range hood further includes a smoke baffle 4 that can flip open and close the first air inlet 11. The fan system 2 includes a second air inlet 21, which is circular and faces the first air inlet 11. An oil guide plate 5 is also provided in the housing 1, which is located at the rear side of the first air inlet 11, and the fan system 2 can be installed with the oil guide plate 5 at the second air inlet 21. In this embodiment, the first air inlet 11 is rectangular, the second air inlet 21 is circular, the center of the second air inlet 21 is O (which can be regarded as the center of the circle O in this embodiment), and the radius of the second air inlet 21 is R.

[0038] A first filter screen 12 is provided at the first air inlet 11. The first filter screen 12 can generally be a grille. Preferably, the first filter screen 12 has two symmetrically arranged left and right (the junction of the two first filter screens 12 coincides with the second center line B described below), thereby reducing the length of a single first filter screen 12 for easy washing in a sink or dishwasher. A second filter screen 22 can be provided at the second air inlet 21. The second filter screen 22 can be in the shape of a disk or a spherical crown, and its mesh is a honeycomb hole or a diamond hole, etc. The above-mentioned first filter screen 12 and second filter screen 22 can also adopt other existing technologies.

[0039] The center line of the range hood in the left-right direction is the first center line A (usually regarded as the center line of the housing 1 in the left-right direction), which is a line extending in the vertical direction, that is, a vertical line passing through the center in the horizontal direction. The center O of the second air inlet 21 is offset relative to the first center line A, and in this embodiment, it is offset to the right, and the horizontal distance from the center O to the first center line A is L. The air hood 3 is offset relative to the first center line A, and the offset direction is opposite to the offset direction of the center O, that is, the part of the air hood 3 located on the left side of the first center line A is larger than the part of the air hood 3 located on the right side of the first center line A.

[0040] Therefore, the air inlet area of ​​the second air inlet 21 corresponding to the left side of the first center line A is:

[0041]

[0042] The air inlet area of ​​the second air inlet 21 corresponding to the right side of the first center line A is:

[0043]

[0044] For the convenience of calculation, the second air inlet 21 is calculated as a regular circle. Alternatively, it can be measured according to the actual design.

[0045] The length (dimension in the left-right direction) of the first air inlet 11 is D, and the width (dimension in the up-down direction) is h. The center line of the first air inlet 11 in the left-right direction is the second center line B (the second center line B is also a vertical line), and the second center line B does not coincide with the first center line A. In this embodiment, it is offset to the left, that is, the second center line B is located on the left side of the first center line A, and the center O and the second center line B are located on opposite sides of the first center line A. The horizontal distance between the second center line B and the first center line A is d.

[0046] Therefore, the air inlet area of ​​the first air inlet 11 corresponding to the left side of the first center line A is K1: h, the air inlet area of ​​the first air inlet 11 corresponding to the right side of the first center line A is K2:

[0047] In order to ensure that the air volume on both sides of the first center line A is equal, it is necessary to meet It follows from this

[0048] Embodiment 2

[0049] See also Figure 5 In this embodiment, the difference from the above-mentioned embodiment 1 is that the first air inlet 11 is not rectangular, and the upper edge of the first air inlet 11 is a curve.

[0050] The lower edge of the first air inlet 11 is the X-axis (right side is positive), the first center line A is the Y-axis (upper side is positive), the center O is located in the first quadrant of the coordinate system, the upper edge of the first air inlet 11 is a continuous curve, the contour function is f(x), and x is the horizontal coordinate of any point on the curve. The air inlet area of ​​the fan system 2 on the left and right sides of the first center line A is the same as that of the first embodiment, and is recorded as The air inlet area of ​​the first air inlet 11 located on the right side of the first center line A is: The air inlet area of ​​the first air inlet 11 located on the left side of the first center line A is Where a is the horizontal coordinate of the right end of the lower edge of the first air inlet 11 (the vertical coordinate is 0), and b is the horizontal coordinate of the left end of the lower edge of the first air inlet 11 (the vertical coordinate is 0). The horizontal coordinate of the second center line B is d (the offset is the absolute value of d), then

[0051] In order to ensure that the air volume on both sides of the first center line A is equal, it is necessary to meet the following conditions: Then K2=k*K1, from which we can conclude:

[0052]

[0053] Let the original function of f(x) be F(x), then It turns out that:

[0054]

[0055] Thus, the relationship between the offset d, the length D of the first air inlet 11 and the original function of the profile function f(x) can be obtained.

[0056] The calculation of the offset amount for other special-shaped first air inlets 11 is similar to that of the above embodiment. This principle will suffice.

Claims

1. A range hood, comprising a housing (1) and a fan system (2) at least partially disposed in the housing (1), wherein a first air inlet (11) is formed on the front side of the housing (1), the housing (1) having a first center line (A) in a left-right direction, the fan system (2) comprising a second air inlet (21) facing the first air inlet (11), characterized in that: The first air inlet (11) and the second air inlet (21) are both offset relative to the first center line (A), and the offset directions of the first air inlet (11) and the second air inlet (21) are opposite.

2. The range hood according to claim 1, characterized in that: The air inlet area of ​​the second air inlet (21) corresponding to the left side of the first center line (A) is S1, the air inlet area of ​​the second air inlet (21) corresponding to the right side of the first center line (A) is S, the air inlet area of ​​the first air inlet (11) corresponding to the left side of the first center line (A) is K1, and the air inlet area of ​​the first air inlet (11) corresponding to the right side of the first center line (A) is K2, and the following conditions are satisfied:

3. The range hood according to claim 1 or 2, characterized in that: The first air inlet (11) has a second center line (B) in the left-right direction, the second air inlet (21) has a center (O), and the second center line (B) and the center (O) are respectively located on opposite sides of the first center line (A).

4. The range hood according to claim 3, characterized in that: The first air inlet (11) is rectangular, and the second air inlet (21) is circular.

5. The range hood according to claim 4, characterized in that: The horizontal distance from the center (O) to the first center line (A) is L, the radius of the second air inlet (21) is R, the horizontal distance between the second center line (B) and the first center line (A) is d, and the following relationship is satisfied: Wherein D is the length of the first air inlet (11), and h is the width of the first air inlet (11).

6. The range hood according to claim 3, characterized in that: The lower edge and the left and right edges of the first air inlet (11) are both straight lines, the upper edge of the first air inlet (11) is a curve, and the second air inlet (21) is circular.

7. The range hood according to claim 6, characterized in that: The air inlet area of ​​the second air inlet (21) corresponding to the left side of the first center line (A) is S1, and the air inlet area of ​​the second air inlet (21) corresponding to the right side of the first center line (A) is S2. A coordinate system is established with the lower edge of the first air inlet (11) as the X-axis and the first center line (A) as the Y-axis, the center (O) is located in the first quadrant of the coordinate system, the upper edge of the first air inlet (11) is a continuous curve and the contour function is f(x), the original function of f(x) is F(x), and the following relationship is satisfied: Wherein D is the length of the first air inlet (11), and d is the horizontal coordinate of the second center line (B).

8. The range hood according to claim 1 or 2, characterized in that: An air outlet hood (3) is provided at the air outlet of the fan system (2); the air outlet hood (3) is offset relative to the first center line (A), and the offset direction is opposite to the offset direction of the second air inlet (21) of the fan system (2).

9. The range hood according to claim 1 or 2, characterized in that: The range hood further comprises a smoke baffle (4) which can be flipped to open and close the first air inlet (11).

10. The range hood according to claim 1 or 2, characterized in that: A first filter screen (12) is provided at the first air inlet (11), and a second filter screen (22) is provided at the second air inlet (21).

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