Range hood

Abstract

The invention discloses a range hood, which comprises a fan frame, a first air inlet, a second air inlet, a first air outlet and a second air outlet, the exhaust fume collecting hood is connected with the fan frame, and the exhaust fume collecting hood is provided with an exhaust fume inlet; the smoke baffle is arranged on the smoke collecting hood and has a first state and a second state, the smoke baffle covers the smoke inlet in the first state, and a smoke gathering cavity is formed by the smoke baffle and the bottom of the smoke collecting hood in the second state; the exhaust fume collecting hood is provided with a first top surface, the sectional area of one end of the exhaust fume collecting hood in the width direction is S1, the sectional area of one end of the exhaust fume collecting hood connected with the fan frame in the width direction is S2, and the two sectional areas meet the following relation: S2 / S1 > = 1.7; in the first state, the bottom surface of the exhaust fume collecting hood forms a first flow guide surface, an acute included angle alpha is formed between the first flow guide surface and the horizontal plane, the exhaust fume barrier is provided with a second flow guide surface, and in the second state, an acute included angle beta is formed between the second flow guide surface and the horizontal plane, and the following relations are met: beta is greater than alpha, and beta-alpha is greater than 10 degrees.

Description

Technical Field

[0001] The invention relates to an oil fume purification device, in particular to a range hood. 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. Top-suction range hoods are more and more widely used due to their advantages such as being neat, light and small in space. Top-suction range hoods usually include a fume hood and a fan housing located on the fume hood. A volute, an impeller and a motor driving the impeller are installed in the fan housing.

[0003] Compared with side-suction range hoods, the smoke collection chamber of a top-suction range hood is farther away from the cooker (smoke source), so the problem of smoke leakage is more serious, especially the smoke leakage at the front side of the range hood. For this reason, some range hoods will guide the flow of oil smoke by setting a smoke baffle to reduce smoke leakage at the front side. For example, a smoke collection mechanism and a range hood disclosed in a Chinese patent with application number 202321451824.1, the smoke collection mechanism includes a smoke collection hood, a lower wind shield and a front smoke shield, the smoke collection hood includes an upper shell, the upper shell has a smoke collection chamber and a smoke inlet plate forming the lower bottom of the smoke collection chamber, the smoke inlet plate is provided with an external air inlet connected to the smoke collection chamber, the front smoke shield is rotatably mounted on the front end of the upper shell and can selectively open or close the external air inlet, and when the front smoke shield closes the external air inlet, the upper end of the lower wind shield is butted against the rear end of the front smoke shield.

[0004] However, for some cooking occasions with a lot of oil smoke, the above structure is still not enough to solve the problem of smoke leakage. For this reason, the common practice in the market is to lower the installation height of the range hood to make the smoke collection chamber close to the pot (smoke source) on this basis to ensure the oil smoke absorption effect. However, on the one hand, after lowering the installation height, more parts of the whole machine are exposed outside the cabinet, which is not only unsightly and occupies too much cooking operation space, but also puts higher requirements on the size of the cabinet, resulting in poor adaptability of the range hood product; on the other hand, due to the reduction in installation height, when the smoke baffle is opened, the user's operating space is reduced, and the user's line of sight is blocked, which is not conducive to cooking operations.

[0005] Therefore, there is room for further improvement. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a range hood that improves the range hood extraction effect without adjusting the installation height in view of the above-mentioned deficiencies in the prior art.

[0007] The technical solution adopted by the present invention to solve the above technical problems is: a range hood, comprising:

[0008] A fan frame having a front side and a back side, wherein a fan system is arranged inside the fan frame, wherein the fan system comprises a fan, wherein the fan comprises a first air inlet facing the front side, and a first smoking passage is formed between the front side of the fan and the front side of the fan frame;

[0009] A smoke collecting hood connected to the fan frame, the smoke collecting hood having a smoke inlet; and

[0010] A smoke baffle is provided on the smoke collecting hood and has a first state and a second state. In the first state, the smoke baffle covers the smoke inlet. In the second state, the smoke baffle and the bottom of the smoke collecting hood form a smoke collecting cavity, and the smoke inlet is located in the smoke collecting cavity. The characteristics are:

[0011] The smoke collecting hood has a first top surface located on the left and right sides of the fan frame, the first top surface is arranged to be inclined upward from the back to the front in the depth direction of the range hood, and the first top surface is arranged to be inclined upward from the left and right sides of the range hood to the middle direction;

[0012] The cross-sectional area of ​​one end of the fume hood in the width direction is S1, and the cross-sectional area of ​​one end of the fume hood connected to the fan frame in the width direction is S2, and the two cross-sectional areas satisfy the following relationship: S2 / S1≥1.7;

[0013] The bottom surface of the smoke hood constitutes a first guide surface, and the acute angle between the first guide surface and the horizontal plane is α. The smoke baffle has a second guide surface. In the second state, the acute angle between the second guide surface and the horizontal plane is β, and the following relationship is satisfied: β>α, and β-α>10°.

[0014] By making the first top surface of the smoke collecting hood tilted upward from the back to the front in the depth direction of the range hood, the oil smoke entering the smoke collecting hood can be guided upward to the front side of the fan frame, so as to better promote the fan to draw smoke from the first smoking channel. In addition, the first top surface is also tilted upward from the left and right sides of the range hood to the middle, so as to guide the oil smoke from both sides to the middle of the fan frame, so as to better promote the fan to draw smoke from the first smoking channel. By making the cross-sectional area of ​​the smoke collecting hood larger at the connection with the fan frame, the smoke inlet corresponding to the two sides of the width direction of the smoke collecting hood (i.e., the position corresponding to the stove head) The cross-sectional area of ​​the hood is small, so that a faster suction flow rate can be provided, thereby improving the oil fume suction effect on both sides of the smoke collecting hood; the first guide surface guides the oil fume entering from the smoke inlet to the front side of the fan frame, so as to facilitate smoking from the first smoking channel, and the second guide surface guides the oil fume to the rear side, so the larger the value of β, the weaker the effect of guiding to the rear side, which is conducive to the oil fume being sucked from the first smoking channel; the larger the difference between β and α, the smaller the impact of the oil fume guided by the second guide surface and the first guide surface on each other, which is conducive to reducing losses; through the above structure, the oil fume suction effect can be improved without adjusting the installation height of the range hood.

[0015] Furthermore, the fan further includes a second air inlet facing the rear side, and in the second state, when the smoke shield is projected along its extension direction to the back side of the fan frame, the projection of the smoke shield falls within the range defined by the back side of the fan frame. Thus, the smoke shield can guide the oil smoke to the second smoking channel formed between the fan and the back side of the fan frame, which is conducive to the oil smoke being quickly sucked into the second air inlet of the fan, thereby improving the oil smoke suction effect.

[0016] Furthermore, the first top surface and the fan frame have a connecting line, and along the depth direction of the range hood, the connecting line gradually extends from the back to the front. At least a part of the oil smoke guided by the smoke baffle is blocked by the first top surface and guided again, and the existence of the connecting line can better guide the oil smoke guided again to the front side of the fan frame, so that more oil smoke can be smoked through the first smoking channel.

[0017] Furthermore, in the second state, the obtuse angle between the smoke baffle and the connecting line is γ, and the following relationship is satisfied: γ<160°. If γ exceeds 160°, the path of the oil smoke guided by the smoke baffle and the connecting line to the front side of the fan rack will become longer, the loss will become greater, and it will be unfavorable to smoke from the first smoking channel.

[0018] In order to ensure that the smoke baffle has sufficient smoke-collecting width, γ also satisfies the following relationship: γ>100°.

[0019] Furthermore, in the second state, the lowest point of the smoke baffle is lower than any position of the smoke collecting hood, so that the negative pressure zone is expanded to a lower position, thereby improving the oil fume absorption effect.

[0020] Furthermore, on any vertical plane extending forward and backward through the first top surface, an extension line of the smoke baffle along its extension direction intersects with the first top surface, so as to facilitate directing the oil smoke toward the first top surface and being guided by the first top surface.

[0021] Furthermore, the projection of the front end of the first top surface on the horizontal plane is located within the projection of the first smoking channel on the horizontal plane, so as to better promote the fan to smoke from the first smoking channel, and avoid the oil smoke losing the guidance of the first top surface before reaching the first smoking channel, so that the oil smoke path suddenly changes, causing noise and greater flow loss.

[0022] Furthermore, the fan further includes a second air inlet facing the rear side as a main air inlet, and a second smoking passage is formed between the front side of the fan and the back side of the fan frame; the depth of the first smoking passage along the depth direction of the range hood is D1, the depth of the second smoking passage along the depth direction of the range hood is D2, and D1≥D2 is satisfied. The depth of the first smoking passage is used to compensate for the lack of air intake capacity of the first air inlet, so as to better utilize the oil smoke directed to the front side by the smoke collecting hood and promote its inhalation by the fan.

[0023] Furthermore, α also satisfies the following relationship: the value of α is less than 30°, 25° or 20°, so that the first guide surface can better guide the oil smoke forward and guide the oil condensed thereon backward.

[0024] Compared with the prior art, the advantages of the present invention are as follows: by making the first top surface of the smoke collecting hood tilted upward from the back to the front in the depth direction of the range hood, the oil smoke entering the smoke collecting hood can be guided upward to the front side of the fan frame, so as to better promote the fan to draw smoke from the first smoking channel; in addition, the first top surface is also tilted upward from the left and right sides of the range hood to the middle direction, so as to guide the oil smoke from both sides to the middle of the fan frame, so as to better promote the fan to draw smoke from the first smoking channel; by making the cross-sectional area of ​​the smoke collecting hood larger at the connection with the fan frame, the smoke inlet is closer to the smoke collecting hood. The cross-sectional area of ​​the smoke hood corresponding to the two sides in the width direction of the hood (i.e., the positions corresponding to the stove head) is smaller, so as to provide a faster suction flow rate and improve the oil fume suction effect on both sides of the smoke hood; the first guide surface guides the oil fume entering from the smoke inlet to the front side of the fan frame, so as to facilitate smoking from the first smoking channel, and the second guide surface guides the oil fume to the rear side. Therefore, the larger the value of β, the weaker the effect of guiding to the rear side, which is conducive to the suction of oil fume from the first smoking channel; the larger the difference between β and α, the smaller the impact of the mutual collision of oil fumes guided by the second guide surface and the first guide surface, which is conducive to reducing losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the open state of the range hood according to the embodiment of the present invention (viewed from front to back);

[0026] Figure 2 Schematic diagram of the open state of the range hood according to the embodiment of the present invention (viewed from the back to the front);

[0027] Figure 3 Schematic diagram of the open state of the range hood according to an embodiment of the present invention (viewed from left to right);

[0028] Figure 4 A side view of the range hood in an open state according to an embodiment of the present invention;

[0029] Figure 5 is a cross-sectional perspective view of the range hood in an open state according to an embodiment of the present invention;

[0030] Figure 6 is a cross-sectional side view of the range hood in an open state according to an embodiment of the present invention;

[0031] Figure 7 A side view of a range hood in a closed state according to an embodiment of the present invention;

[0032] Figure 8 It is a front view of the range hood in the closed state according to the embodiment of the present invention. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions.

[0034] In the description of the present invention, 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 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. Since the embodiments disclosed in the present invention 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] See also Figures 1 to 8A range hood comprises a smoke hood 1, a fan frame 2 and a fan system arranged in the fan frame 2, the fan frame 2 is connected to the smoke hood 1 and is arranged on the smoke hood 1, the smoke hood 1 has a smoke inlet 11, and in this embodiment, the smoke inlet 11 is opened at the bottom of the smoke hood 1.

[0036] The fan system includes a fan 3, and the fume hood 1 and the fan frame 2 are fluidically connected, thereby making the fume inlet 11 and the fan 3 fluidically connected, and the oil smoke enters the fume hood 1 from the fume inlet 11 and is discharged to the outside of the range hood through the fan 3. Preferably, the fan 3 is a centrifugal fan, which at least includes a first air inlet 31 facing the front side (i.e., the side facing the user in the installed state), thereby forming a first smoking channel 221 between the front side of the fan 3 and the front side 21 of the fan frame 2. Optionally, the fan 3 also has a second air inlet 32 ​​facing the rear side (i.e., the side away from the user in the installed state).

[0037] The smoke hood 1 further includes a first top surface 12 and a second top surface 14. The first top surface 12 is located on the left and right sides of the fan frame 2, and the second top surface 14 is located on the left and right sides and the front side of the fan frame 2. The first top surface 12 is located behind the second top surface 14, and the two are connected without a gap. The first top surface 12 is located in the depth direction X( Figure 4 The first top surface 12 is tilted upward from the back to the front in the direction of the front and rear directions (i.e., the front-to-rear direction in the installed state), so that the oil smoke entering the smoke hood 1 can be guided upward to the front side of the fan frame 2, so as to better promote the fan 3 to smoke from the first smoking channel 221. In addition, the first top surface 12 is also tilted upward from the left and right sides of the range hood to the middle direction, so as to guide the oil smoke from both sides to the middle of the fan frame 2, so as to better promote the fan 3 to smoke from the first smoking channel 221. The projection of the front end of the first top surface 12 on the horizontal plane is located within the projection of the first smoking channel 221 on the horizontal plane (including falling on the contour line of the rear end of the projection of the first smoking channel 221), so as to better promote the fan 3 to smoke from the first smoking channel 221, and avoid the oil smoke losing the guidance of the first top surface 12 before reaching the first smoking channel 221, so that the oil smoke path suddenly changes, causing noise and large flow loss.

[0038] The smoke inlet 11 is arranged along the width direction Y of the smoke collecting hood 1 ( Figure 3 The cross-sectional area of ​​the fume hood 1 at one end (the left end or the right end) in the width direction Y is S1. Figure 3 The cross-sectional area obtained by the vertical plane (cross section M1) extending forward and backward in the middle cuts through one end of the fume hood 1 in the width direction Y. The cross-sectional area of ​​the end of the fume hood 1 connected to the fan frame 2 in the width direction Y (connected to the left end or right end of the bottom of the fan frame 2) is S2, which is the cross-sectional area of ​​the fume hood 1 in the width direction Y. Figure 3 The vertical plane (section M2) extending forward and backward in the middle is the area of ​​the cross section obtained by cutting through the end of the fume hood 1 connected to the fan frame 2 in the width direction Y, and the section M1 is parallel to the section M2. The two cross-sectional areas satisfy the following relationship: S2 / S1≥1.7, so that the cross-sectional area of ​​the fume hood 1 corresponding to the two sides of the smoke inlet 11 in the width direction Y of the fume hood 1 (i.e., the position corresponding to the stove head) is smaller, thereby providing a faster suction flow rate and improving the fume suction effect on both sides of the fume hood 1.

[0039] The bottom of the smoke collecting hood 1 gradually tilts downward from front to back along the depth direction X of the range hood, and the bottom surface (the inner surface of the bottom) of the smoke collecting hood 1 constitutes a first guide surface 13. The first guide surface 13 is a plane, and the acute angle between it and the horizontal plane is α, and the value of α is less than 30°, 25° or 20°. The first guide surface 13 guides the oil smoke entering from the smoke inlet 11 to the front side of the fan frame 2, so as to facilitate smoking from the first smoking channel 221.

[0040] A connection line 15 is formed at the junction of the first top surface 12 and the fan frame 2 , and along the depth direction X of the range hood, the connection line 15 extends gradually and obliquely upward from the back to the front. The above-mentioned section M2 passes through the connection line 15 .

[0041] The range hood further comprises a smoke baffle 4, which is arranged on the smoke hood 1. The smoke baffle 4 is movably connected to the smoke hood 1 and can move relative to the smoke hood 1, thereby having a first state and a second state. In the first state, Figure 7 and Figure 8 , the smoke baffle 4 covers the smoke inlet 11; in the second state, see Figure 1 to Figure 6 The smoke baffle 4 and the bottom of the smoke collecting hood 1 form a smoke collecting cavity Q, and the smoke inlet 11 is located in the smoke collecting cavity Q. In the second state, the lowest point of the smoke baffle 4 is lower than any position of the smoke collecting hood 1, so that the negative pressure area is expanded to a lower position, thereby improving the oil fume absorbing effect.

[0042] The smoke baffle 4 has a second guide surface 41, which is also a plane. In the first state, the second guide surface 41 faces the inside of the smoke collecting hood 1. In the second state, the second guide surface 41 constitutes a side wall of the smoke collecting chamber Q. The acute angle between the second guide surface 41 and the horizontal plane is β, and the following relationship is satisfied: β>α, and β-α>10°. The second guide surface 41 guides the oil smoke to the rear side, so the larger the value of β, the weaker the effect of guiding to the rear side, which is conducive to the oil smoke being inhaled from the first smoking channel 221; the larger the difference between β and α, the smaller the impact of the oil smoke guided by the second guide surface 41 and the first guide surface 13 on each other, which is conducive to reducing losses.

[0043] The fan frame 2 has a back side 23, which is close to the wall in the installed state. When the smoke baffle 4 is in the second state, when the smoke baffle 4 is projected onto the back side 23 of the fan frame 2 along its extension direction, its projection falls within the range defined by the back side 23 of the fan frame 2. That is to say, on a vertical plane extending forward and backward (a plane parallel to the section M1 mentioned above), the extension line L1 of the smoke baffle 4 (the smoke baffle 4 is a plate of equal thickness, which can be based on the second guide surface 41) does not intersect with the fan 3, and the intersection of the extension line L1 and the back side 23 of the fan frame 2 is located at the rear side of the fan 3. Therefore, the smoke baffle 4 can guide the oil smoke to the second smoking channel 222 formed between the fan 3 and the back side 23 of the fan frame 2, which is conducive to the oil smoke being quickly sucked into the second air inlet 32 ​​of the fan 3, thereby improving the oil smoke suction effect.

[0044] The depth of the first smoking channel 221 along the depth direction X of the range hood (the volute cover plate of the fan 3 can be used as the measuring position when measuring) is D1, and the depth of the second smoking channel 222 along the depth direction X of the range hood is D2, and D1≥D2 is satisfied. The depth of the first smoking channel 221 is used to compensate for the lack of air intake capacity of the first air inlet 31, so as to better utilize the oil smoke directed to the front side of the smoke collecting hood 1 and promote it to be sucked into the fan 3.

[0045] At least a part of the oil smoke guided by the smoke baffle 4 is blocked by the first top surface 12 and guided for a second time, and the existence of the connecting line 15 can better guide the second guided oil smoke to the front side of the fan frame 2, so that more oil smoke can be smoked through the first smoking channel 221. When the smoke baffle 4 is in the second state, the obtuse angle between the smoke baffle 4 (the smoke baffle 4 is a plate of equal thickness, which can be based on the second guide surface 41) and the connecting line 15 is γ, γ<160°. If γ exceeds 160°, the path of the oil smoke guided by the smoke baffle 4 and the connecting line 15 to the front side of the fan frame 2 will become longer, the loss will become larger, and it will be not conducive to smoking from the first smoking channel 221. In addition, γ>100° is also satisfied to ensure sufficient smoke gathering width (that is, the smoke baffle 4 is ensured by a sufficient opening angle).

[0046] On any vertical plane extending forward and backward through the first top surface 12 (a plane parallel to the section M1 mentioned above), an extension line L1 of the smoke baffle 4 (the smoke baffle 4 is a plate of uniform thickness, and the second guide surface 41 may be used as a reference) intersects with the first top surface 12, so as to facilitate directing the oil smoke to the first top surface 12 and being guided by the first top surface 12.

[0047] The "fluid connection" referred to in the present invention refers to the spatial position relationship between two parts or parts (hereinafter collectively referred to as the first part and the second part respectively), that is, the fluid (gas, liquid or a mixture of the two) can flow from the first part along the flow path or / and be transported to the second part. The first part and the second part can be directly connected, or the first part and the second part can be indirectly connected through at least one third party. The third party can be a fluid channel such as a pipe, channel, duct, guide member, hole, groove, etc., or it can be a chamber allowing fluid to flow through, or a combination of the above.

Claims

1. A range hood, comprising: A fan frame (2) having a front side (21) and a back side (23), wherein a fan system is arranged inside the fan frame, wherein the fan system comprises a fan (3), wherein the fan (3) comprises a first air inlet (31) facing the front side, and a first smoking passage (221) is formed between the front side of the fan (3) and the front side (21) of the fan frame (2); A smoke collecting hood (1) connected to the fan frame (2), the smoke collecting hood (1) having a smoke inlet (11); and A smoke baffle (4) is arranged on the smoke collecting hood (1) and has a first state and a second state. In the first state, the smoke baffle (4) covers the smoke inlet (11). In the second state, the smoke baffle (4) and the bottom of the smoke collecting hood (1) form a smoke collecting cavity (Q), and the smoke inlet (11) is located in the smoke collecting cavity (Q); characterized in that: The fume collecting hood (1) has a first top surface (12) located on the left and right sides of the fan frame (2), the first top surface (12) being arranged to tilt upward from the back to the front in the depth direction of the range hood, and the first top surface (12) being arranged to tilt upward from the left and right sides of the range hood to the middle; The cross-sectional area of ​​one end of the fume hood (1) in the width direction is S1, and the cross-sectional area of ​​one end of the fume hood (1) connected to the fan frame (2) in the width direction is S2, and the two cross-sectional areas satisfy the following relationship: S2 / S1≥1.7; The bottom surface of the smoke collecting hood (1) forms a first guide surface (13), and the acute angle between the first guide surface and the horizontal plane is α. The smoke baffle (4) has a second guide surface (41). In the second state, the acute angle between the second guide surface (41) and the horizontal plane is β, and the following relationship is satisfied: β>α, and β-α>10°.

2. The range hood according to claim 1, characterized in that: The fan (3) further comprises a second air inlet (32) facing the rear side, and in a second state, when the smoke shield (4) is projected along its extension direction onto the back side (23) of the fan frame (2), the projection of the smoke shield (4) falls within a range defined by the back side (23) of the fan frame (2).

3. The range hood according to claim 1, characterized in that: The first top surface (12) and the fan frame (2) have a connecting line (15), and along the depth direction of the range hood, the connecting line (15) extends gradually and obliquely upward from the back to the front.

4. The range hood according to claim 3, characterized in that: In the second state, the obtuse angle between the smoke baffle (4) and the connecting line (15) is γ, and the following relationship is satisfied: γ<160°.

5. The range hood according to claim 4, characterized in that: γ also satisfies the following relationship: γ>100°.

6. The range hood according to claim 1, characterized in that: In the second state, the lowest point of the smoke baffle (4) is lower than any position of the smoke collecting hood (1).

7. The range hood according to claim 1, characterized in that: On any vertical plane extending forward and backward through the first top surface (12), an extension line (L1) of the smoke baffle plate (4) along its extension direction intersects with the first top surface (12).

8. The range hood according to claim 1, characterized in that: The projection of the front end of the first top surface (12) on the horizontal plane is located within the projection of the first smoking channel (221) on the horizontal plane.

9. The range hood according to claim 8, characterized in that: The fan (3) further comprises a second air inlet (32) facing the rear side and serving as a main air inlet, and a second smoking passage (222) is formed between the front side of the fan (3) and the back side (23) of the fan frame (2); The depth of the first smoking channel (221) along the depth direction of the range hood is D1, and the depth of the second smoking channel (222) along the depth direction of the range hood is D2, and D1≥D2 is satisfied.

10. The range hood according to claim 1, characterized in that: α also satisfies the following relationship: the value of α is smaller than 30°, 25°, or 20°.

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