Range hood

Abstract

The utility model discloses a range hood which comprises an exhaust fume collecting hood, a fan frame arranged on the exhaust fume collecting hood and a fan arranged in the fan frame, the exhaust fume collecting hood comprises a fume suction port, and the range hood further comprises a fume deflector arranged below the fume suction port and a noise reduction device arranged in the fan frame. The position, close to the rear side, of the smoke guide plate is rotationally connected with the smoke collecting hood and can rotate relative to the smoke collecting hood, and the noise reduction device can move front and back relative to the fan frame. Compared with the prior art, the range hood has the advantages that the smoke deflector can rotate relative to the exhaust fume collecting hood, and the wind speed of the front side of the smoke deflector can be adjusted through rotation of the smoke deflector, so that a better oil fume suction effect is achieved; and meanwhile, in combination with the movement of the noise reduction device, the smoke deflector can be moved to a proper position when the position of the smoke deflector changes, so that the noise reduction effect is maximized, and higher noise reduction benefits can be obtained by using a smaller size.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kitchen appliance, especially an extractor hood. BACKGROUND

[0002] The extractor hood has become one of the indispensable kitchen household appliances in modern families. Generally, the extractor hood includes a top suction type and a side suction type. The top suction type of extractor hood has more and more extensive applications due to its advantages such as neatness, lightness, small space occupation, etc. The top suction type of extractor hood usually includes a smoke collecting hood, a fan housing located on the smoke collecting hood, a volute, an impeller and a motor driving the impeller installed in the fan housing.

[0003] The existing top suction type of extractor hood, such as the one disclosed in Chinese patent No. 201821537388.9, includes an extractor hood body, a smoke guide plate installed on the extractor hood body for guiding smoke of the extractor hood, and a sound absorbing structure formed between the smoke guide plate and the extractor hood body to absorb the sound of the air flowing through the smoke guide plate.

[0004] This extractor hood has a fixed smoke guide plate, which cannot improve the common front side smoke running problem of the top suction type of extractor hood. In addition, the sound absorbing structure is also fixed. Generally, the larger the volume of the noise reduction device is, the better the noise reduction effect is. However, since the sound absorbing structure is arranged in the flow channel, if the volume is too large, it will affect the air inlet.

[0005] Therefore, how to solve the front side smoke running problem and use a smaller volume of noise reduction device to obtain a better noise reduction effect is a problem to be solved at present. INVENTION CONTENTS

[0006] The utility model solves the technical problem of the prior art, and provides an extractor hood.

[0007] The utility model adopts the technical scheme that an extractor hood includes a smoke collecting hood, a fan frame arranged above the smoke collecting hood and a fan arranged in the fan frame. The smoke collecting hood includes a smoke suction port. The extractor hood further includes a smoke guide plate arranged below the smoke suction port and a noise reduction device arranged in the fan frame. The smoke guide plate is rotatably connected to the smoke collecting hood at a position close to the rear side and can rotate relative to the smoke collecting hood. The noise reduction device can move forward and backward relative to the fan frame.

[0008] The smoke guide plate is rotatably connected to the smoke collecting hood at a position close to the rear side and can rotate relative to the smoke collecting hood. The noise reduction device can move forward and backward relative to the fan frame.

[0009] By enabling the smoke guide plate to rotate relative to the smoke collecting cover, the wind speed in front of the smoke guide plate can be adjusted by the rotation of the smoke guide plate, so as to achieve better oil fume extraction effect; meanwhile, in combination with the movement of the noise reduction device, the noise reduction device can be moved to a suitable position when the position of the smoke guide plate changes, so as to maximize the noise reduction effect and obtain higher noise reduction benefit with smaller volume.

[0010] Further, the extractor hood further comprises a movement mechanism for driving the movement of the smoke guide plate and the noise reduction device, so that when the smoke guide plate is rotated to gradually incline downward from front to back, the noise reduction device is located at the front side in the fan frame. Since the air inlet channel of the front side of the smoke guide plate is reduced and the flow rate is increased when the smoke guide plate is rotated to gradually incline downward from front to back, the noise is increased, therefore the noise reduction device is moved to the front side at this time, so as to have better noise reduction effect on the front side.

[0011] In order to simplify the structure of the movement mechanism, the smoke guide plate and the noise reduction device are linked, and for this purpose, the movement mechanism comprises a first connecting rod, a second connecting rod and an active end push rod capable of ascending and descending, the first connecting rod is rotationally connected with the smoke guide plate and the second connecting rod respectively, and the second connecting rod is further rotationally connected with the noise reduction device and the active end push rod respectively.

[0012] In order to facilitate the definition of the movement track of the noise reduction device, the movement mechanism further comprises a slide rail and a sliding block in sliding cooperation with the slide rail, and the noise reduction device is in sliding connection with the slide rail through the sliding block.

[0013] Preferably, the second connecting rod is in rotational connection with the sliding block.

[0014] Preferably, the side of the slide rail facing the noise reduction device is formed with a track groove, and the sliding block is in sliding connection with the track groove.

[0015] In order to make the movement on both sides stable and achieve noise reduction on both sides, the noise reduction device has two and is arranged on both sides in the fan frame, each noise reduction device corresponds to a second connecting rod, each second connecting rod corresponds to a first connecting rod, the active end push rod is in the shape of a U with an open lower end, and the two second connecting rods are connected with the corresponding side end portions of the active end push rod respectively.

[0016] Preferably, in order to facilitate the connection of the smoke guide plate and the first connecting rod, the upper surface of the smoke guide plate is provided with a mounting seat near the front side, and the first connecting rod is in rotational connection with the mounting seat.

[0017] In order to facilitate automatic control of the movement mechanism, an oil fume sensor for detecting the oil fume concentration and thus for controlling the movement mechanism is arranged on the smoke collecting cover.

[0018] Preferably, the smoke collecting hood comprises a hood body, the smoke suction port is arranged on the hood body, a hanging shaft is arranged at a position close to the rear side of the bottom of the hood body, and a hook is arranged at a position close to the rear side of the upper surface of the smoke guide plate, the hook is hung on the hanging shaft and can rotate relative to the hanging shaft.

[0019] Compared with the prior art, the advantages of the utility model lie in that: by enabling the smoke guide plate to rotate relative to the smoke collecting hood, the wind speed at the front side of the smoke guide plate can be adjusted through the rotation of the smoke guide plate, so that better oil fume suction effect is achieved; and meanwhile, combined with the movement of the noise reduction device, the noise reduction device can be moved to a suitable position when the position of the smoke guide plate changes, so that the noise reduction effect is maximized, and higher noise reduction benefit is obtained with smaller volume. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic view of the extractor hood of the first embodiment of the utility model (first working state);

[0021] Figure 2 is a sectional view of Figure 1 ;

[0022] Figure 3 is a partially exploded structural schematic view of the extractor hood of the first embodiment of the utility model;

[0023] Figure 4 is a sectional view of the extractor hood of the first embodiment of the utility model (second working state);

[0024] Figure 5 is a schematic view of the smoke guide plate, the noise reduction device and the movement mechanism thereof of the extractor hood of the first embodiment of the utility model (second working state);

[0025] Figure 6 is a schematic view of the movement principle of the smoke guide plate, the noise reduction device and the movement mechanism thereof of the extractor hood of the first embodiment of the utility model;

[0026] Figure 7 is a schematic view of the extractor hood of the second embodiment of the utility model;

[0027] Figure 8 is a schematic view of the extractor hood of the third embodiment of the utility model. DETAILED DESCRIPTION

[0028] The embodiments of the utility model are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions.

[0029] In the description of the utility model, it is understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, since the disclosed embodiments of the utility model can be arranged in different directions, so these orientation indicating terms are only as an illustration and should not be regarded as a limitation, for example, "upper", "lower" are not necessarily limited to the direction opposite or consistent with the direction of gravity. In addition, the features limited by "first", "second" can explicitly or implicitly include one or more features.

[0030] Embodiment one

[0031] Reference Figures 1-5 An oil fume extractor is a top suction type oil fume extractor, which comprises a smoke collecting hood 1, a fan frame 2 located above the smoke collecting hood 1 and a fan 3 arranged in the fan frame 2, and the fan 3 is usually a centrifugal fan.

[0032] The smoke collecting hood 1 comprises a hood body 11 and a smoke suction port 12 formed on the hood body 11, and the oil fume extractor further comprises a smoke guide plate 4 located below the smoke suction port 12. The rear part of the smoke guide plate 4 is rotationally connected with the smoke collecting hood 1, and the rotation axis extends in the left-right direction. In the embodiment, the bottom of the hood body 11 is provided with a hanging shaft 13 near the rear side, and the upper surface of the smoke guide plate 4 is provided with a hook 41 near the rear side, the hook 41 is hung on the hanging shaft 13 and can rotate relative to the hanging shaft 13, thereby connecting the smoke guide plate 4 with the smoke collecting hood 1, and this mode also facilitates the disassembly of the smoke guide plate 4. The hood body 11 is concave upward from the bottom to form a smoke collecting cavity 14, and the smoke suction port 12 is located at the top of the smoke collecting cavity 14.

[0033] The fan frame 2 is provided with a noise reduction device 5, which can reduce fluid noise, fan noise and the like in the fan frame 2. The noise reduction device 5 can adopt the existing technology, such as the commonly used sound absorbing box.

[0034] The smoke guide plate 4 and the noise reduction device 5 can move relative to the fixed components (the smoke collecting cover 1 and the fan frame 2) of the extractor hood. For this purpose, the extractor hood further comprises a movement mechanism, which enables the smoke guide plate 4 to rotate relative to the smoke collecting cover 1 about the rotating connection therebetween, and enables the noise reduction device 5 to move horizontally forward and backward relative to the fan frame 2. The smoke guide plate 4 and the noise reduction device 5 can move respectively by using independent existing rotating driving mechanisms and linear driving mechanisms, and in the present embodiment, the movement mechanism has only a single driving source, thereby simplifying the structure and enabling the smoke guide plate 4 and the noise reduction device 5 to better cooperate with each other.

[0035] The movement mechanism comprises a first connecting rod 61, a second connecting rod 62, a driving end push rod 63 and a slide rail 64. In the present embodiment, the noise reduction device 5 has two, which are arranged respectively on the left and right sides in the fan frame 2, and the slide rail 64 also has two corresponding ones, which are fixed respectively to the corresponding side walls of the fan frame 2. The noise reduction device 5 is provided with a slide block 65 on the side facing the corresponding slide rail 64, and the slide rail 64 is formed with a rail groove 641 on the side facing the corresponding noise reduction device 5, the slide block 65 and the corresponding rail groove 641 are in sliding connection, thereby enabling the noise reduction device 5 to slide along the rail groove 641 and generally not to rotate relative to the slide rail 64.

[0036] The combination of the first connecting rod 61 and the second connecting rod 62 also has two corresponding groups. The upper surface of the smoke guide plate 4 is provided with mounting seats 42 at positions close to the front side, and the mounting seats 42 are arranged in two groups with a spacing therebetween. The first connecting rod 61 (preferably one end thereof) in each group is in rotating connection with the corresponding mounting seat 42, and the first connecting rod 61 (preferably the other end thereof) in each group is further in rotating connection with the second connecting rod 62 in the same group, and can be connected at a middle position between the two ends of the second connecting rod 62. Since the connecting rod assembly formed by the first connecting rod 61 and the second connecting rod 62 has two groups, the driving end push rod 63 is preferably in the shape of an open U, the second connecting rod 62 (preferably one end thereof) in each group is in rotating connection with the corresponding slide block 65, and the second connecting rod 62 (preferably the other end thereof) is further in rotating connection with the corresponding end of the driving end push rod 63.

[0037] The movement mechanism further comprises a driving source (not shown in the figure) for driving the driving end push rod 63 to move up and down, which can be a motor screw nut combination, a motor gear rack combination, an electric push rod, etc., i.e. any existing mechanism that can output linear movement.

[0038] Referring to Figure 1 and Figure 2, at this time, the range hood is in the first working state, the smoke guide plate 4 is in the substantially horizontal state, the noise reduction device 5 is located at the rear limit position, and the distance between the front end of the smoke guide plate 4 and the top of the corresponding position of the smoke collecting cavity 14 is d1. When the driving end push rod 63 is driven by the driving source and gradually rises, the two connecting rods rotate, the included angle of the second connecting rod 62 with the horizontal plane gradually increases, the noise reduction device 5 is driven to move forward, the first connecting rod 61 drives the front side of the smoke guide plate 4 to move upward, the smoke guide plate 4 rotates around the connection with the smoke collecting cover 1, and finally the included angle between the smoke guide plate 4 and the horizontal plane is α1, and the smoke guide plate 4 gradually inclines downward from front to back, and the noise reduction device 5 can move to the front limit position, and the distance between the front end of the smoke guide plate 4 and the top of the corresponding position of the smoke collecting cavity 14 is d2, see Figure 4 , at this time, the range hood is in the second working state. d1>d2, optionally, α1 is 5°, d1 is 54 mm, and d2 is 28 mm, that is to say, from the first working state to the second working state, the front side air inlet channel between the smoke guide plate 4 and the smoke collecting cover 1 is reduced.

[0039] The above-mentioned angle α1 and the positional relationship of the smoke guide plate 4 and the noise reduction device 5 during linkage exist the following relationship, see Figure 6 , wherein P1 is the upper end of the driving end push rod 63, P2 is the rotation center of the connection between the noise reduction device 5 and the second connecting rod 62, P3 is the rotation connection center of the driving end push rod 63 and the second connecting rod 62, P4 is the rotation center of the connection between the mounting seat 42 of the smoke guide plate 4 and the first connecting rod 61, and P5 is the rotation center of the smoke guide plate 4. The above-mentioned points are the projections of each component or connection position on the same vertical plane, which is a vertical plane extending forward and backward.

[0040] Taking the initial position of P2 as the coordinate origin, the horizontal line passing through the coordinate origin is the X axis, and the vertical line passing through the coordinate origin is the Y axis. The coordinates of P1 are (X1, Y1), and the movement form is downward movement, as indicated by arrow A, and the moving distance is dy; the straight line distance between P1 and P2 is L1, which is divided into two segments L2 and L3 by the first connecting rod 61 at P3 (X3, Y3). The coordinates of P2 are (X2, 0), and the initial X2=0. The movement form is horizontal to the right, as indicated by arrow B, and the moving distance is dx. The coordinates of P4 are (X4, Y4), the coordinates of P5 are (X5, Y5), the length of the line connecting P4 and P5 is L5, the length of the first connecting rod 61 is L4. The included angle between the line connecting P4 and P5 and the horizontal direction is α2, the included angle between the line connecting P4 and P5 and the smoke guide plate 4 is β, and the included angle between the smoke guide plate 4 and the horizontal direction is α1=β-α2 (β is a constant value and does not change during movement).

[0041] From the geometric relationship, it can be obtained that:

[0042] (X2-X1) 2 +Y12 = L1 2 , the position of the noise reduction device 5 and the position of the active end push rod 63 can be obtained as follows:

[0043]

[0044] Correspondingly:

[0045]

[0046] Y3 = Y1 * L3 / L1 ③

[0047] X3 = X2 - (X2 - X1) * L3 / L1 ④

[0048]

[0049] Substituting equations ②, ③ and ④ into ⑤, the relationship between Y4 and X2 can be obtained: let Y4 = f(X2), according to the geometric relationship, it is easy to obtain:

[0050] Sinα2 = (Y4 - Y5) / L5 ⑥

[0051] Thus, the angle α1 between the smoke guide plate 4 and the horizontal direction is β - arcsin((f(X2) - Y5) / L5).

[0052] The front side of the smoke collecting hood 1 has a constant flow rate, in the first working state, the front side of the smoke collecting hood 1 has a wind speed V1, and in the second working state, the front side of the smoke collecting hood 1 has a wind speed V2, and test results show that V2 = 1.5V1. The greater the wind speed, the better the oil fume absorption effect on the escaped oil fume at the front side. However, increasing the wind speed at the front side will cause the noise to be higher, and in the case that the proportion of noise generated at the front side is increased, more effective noise reduction measures are needed, therefore, in the second working state, the noise reduction device 5 is moved to the front side, so as to effectively reduce the noise value after the flow rate is increased. Compared with the fixed setting, the noise reduction device 5 in the mobile setting can have a smaller size and obtain a better noise reduction effect.

[0053] In the first working state, the wind speed around the smoke guide plate 4 is relatively uniform, and the noise value is lower, so that a better cooking experience can be obtained.

[0054] Embodiment Two

[0055] Referring to Figure 7 The difference between the above-mentioned embodiment one and the present embodiment is that the oil fume sensor 7 is arranged on the front side wall of the smoke collecting cavity 14 formed by the hood body 11, the size of the oil fume at the front side is monitored, the movement mechanism is controlled, and the angle between the smoke guide plate 4 and the horizontal direction is automatically adjusted.

[0056] Embodiment Three

[0057] Referring to Figure 8The difference from the above-mentioned embodiment two is that the oil fume sensor 7 is arranged on the front side wall surface of the smoke collecting hood 1, and can be arranged behind the glass panel (a conventional structure of the smoke collecting hood 1, and the glass panel is arranged here), and a window is arranged on the glass panel. When the oil fume escape is detected and the face has the risk of contacting the oil fume, the motion mechanism is automatically started and runs to the second working state, so as to improve the front side flow rate and quickly suck away the oil fume.

[0058] In actual application, one oil fume sensor 7 can be arranged on the left and right respectively, and the judgment of the oil fume state is more accurate.

Claims

1. A range hood comprising a hood (1), a fan frame (2) arranged above the hood (1), and a fan (3) arranged in the fan frame (2), the hood (1) comprising a smoke suction opening (12), the range hood further comprising a smoke guide plate (4) arranged below the smoke suction opening (12) and a noise reduction device (5) arranged in the fan frame (2), characterized in that: the smoke guide plate (4) is rotationally connected to the hood (1) at a position close to the rear side and can rotate relative to the hood (1), and the noise reduction device (5) can move forward and backward relative to the fan frame (2). The range hood further comprises a movement mechanism for driving the movement of the smoke guide plate (4) and the noise reduction device (5), so that when the smoke guide plate (4) is rotated to gradually incline downward from front to back, the noise reduction device (5) is located at the front side in the fan frame (2).

2. The hood according to claim 1, characterized in that: The movement mechanism comprises a first connecting rod (61), a second connecting rod (62), and a driving end push rod (63) that can be raised and lowered, the first connecting rod (61) is rotationally connected to the smoke guide plate (4) and the second connecting rod (62) respectively, and the second connecting rod (62) is further rotationally connected to the noise reduction device (5) and the driving end push rod (63) respectively.

3. The hood according to claim 2, characterized in that: The movement mechanism further comprises a sliding rail (64) and a sliding block (65) that is in sliding cooperation with the sliding rail (64), and the noise reduction device (5) is in sliding cooperation with the sliding rail (64) through the sliding block (65).

4. The hood according to claim 3, characterized in that: The second connecting rod (62) is rotationally connected to the sliding block (65).

5. The hood according to claim 4, characterized in that: The side of the sliding rail (64) facing the noise reduction device (5) is formed with a rail groove (641), and the sliding block (65) and the rail groove (641) are in sliding cooperation.

6. The hood according to claim 4, characterized in that: The noise reduction device (5) has two and is arranged on the left and right sides in the fan frame (2), each noise reduction device (5) corresponds to a second connecting rod (62) respectively, each second connecting rod (62) corresponds to a first connecting rod (61) respectively, the driving end push rod (63) is in the shape of a U with an open lower end, and the two second connecting rods (62) are connected to the corresponding side end portions of the driving end push rod (63) respectively.

7. The hood according to claim 3, characterized in that: The upper surface of the smoke guide plate (4) is provided with a mounting seat (42) at a position close to the front side, and the first connecting rod (61) is rotationally connected to the mounting seat (42).

8. The hood according to claim 3, characterized in that: The hood (1) is provided with an oil fume sensor (7) for detecting the concentration of oil fume and controlling the movement mechanism.

9. The hood according to claim 2, characterized in that: The hood (1) comprises a cover body (11), the smoke suction opening (12) is arranged on the cover body (11), the bottom of the cover body (11) is provided with a hanging shaft (13) at a position close to the rear side, and the upper surface of the smoke guide plate (4) is provided with a hook (41) at a position close to the rear side, the hook (41) is hung on the hanging shaft (13) and can rotate relative to the hanging shaft (13).

10. The hood according to any one of claims 1-9, characterized in that: ​

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