Range hood

Abstract

The invention discloses a range hood which comprises a fixed box body; the movable box body and the fixed box body are arranged in a nested mode, the movable box body can rotate relative to the fixed box body, and when the extractor hood is in an open state, the overlapping degree of the fixed box body and the movable box body is larger than that when the extractor hood is in a closed state; the smoke barrier can rotate relative to the fixed box body, the section of the smoke barrier is a vertical plane in the front-back direction, and on the plane, the rotation center of the smoke barrier is a first rotation center, and the rotation center of the movable box body is a second rotation center; the range hood further comprises an air inlet plate, an air inlet is formed in the air inlet plate, and when the range hood is in an open state, the air inlet plate is located between the smoke baffle and the movable box body.

Description

Technical Field

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

[0002] A range hood is a kitchen appliance that purifies the kitchen environment. It can quickly remove waste from the stove and fumes produced during cooking and exhaust them outdoors, reducing pollution and purifying the air.

[0003] Current side-draft range hoods, in order to ensure effective smoke extraction, tend to be quite bulky in appearance. This leads to issues with cookware, such as the cooktop not being too close to the hood body during installation, and also imposes implicit constraints on the size of the cookware—it cannot be too large or too tall. Furthermore, the current development trend of side-draft range hoods is towards ultra-thin designs. However, making the casing too thin would reduce the effective area of ​​the air intake, thus affecting the smoke extraction effect. Widening it horizontally would result in disproportionate proportions, while increasing its depth would affect the size of the cookware and its installation position, making it impossible to achieve an ultra-thin design overall.

[0004] To expand the smoke collection range and improve the fume extraction effect, a common solution is to use nested housings, pushing or rotating the movable housing out to increase the thickness of the housing, expand the air intake channel, and bring the negative pressure zone closer to the cooking area. For example, Chinese Patent Application No. 202322060839.1 discloses a range hood that includes a smoke collection hood, within which a smoke collection chamber shell is rotatably connected to the bottom of the smoke collection hood. A smoke baffle is provided on one side of the smoke collection hood, and a drive assembly is provided inside the smoke collection hood. The drive assembly is connected to the smoke baffle, and the smoke baffle is connected to the smoke collection chamber shell via a linkage. The drive assembly can drive the smoke baffle to open and close, and the smoke baffle can, via the linkage, drive the smoke collection chamber shell to rotate towards the area to be extracted or retract into the smoke collection hood. A drive mechanism for driving the smoke baffle is provided inside the smoke collection hood.

[0005] This type of range hood increases the air intake cavity by rotating the smoke collection chamber housing forward when turned on, providing space for the smoke to buffer and improving the smoke collection effect. When the range hood is turned off, the depth of the smoke collection hood decreases, allowing it to achieve the thinnest possible shape. Because of the presence of a movable housing and a smoke baffle, there is a height difference between their centers of rotation. This causes the movable housing and the smoke baffle to move asynchronously. When the range hood is open, a gap appears between the smoke baffle and the movable housing, allowing smoke to escape through this gap.

[0006] Therefore, further improvements are needed. Summary of the Invention

[0007] The first technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing a range hood that achieves a thin profile and reduces the escape of oil fumes while ensuring effective fume extraction.

[0008] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a range hood, comprising:

[0009] Fixed enclosure;

[0010] The movable housing is nested within the fixed housing and can rotate relative to the fixed housing. When the range hood is on, the overlap between the fixed housing and the movable housing is greater than the overlap when the range hood is off.

[0011] The smoke baffle can rotate relative to the fixed box. Taking a vertical plane in the front and back direction as a cross-section, on this plane: the rotation center of the smoke baffle is the first rotation center, and the rotation center of the movable box is the second rotation center.

[0012] Its features are:

[0013] The range hood also includes an air inlet plate, which has an air inlet. When the range hood is in the open state, the air inlet plate is located between the smoke baffle and the movable box.

[0014] By installing an air inlet plate, it fills the gap between the smoke baffle and the movable box when the range hood is turned on, blocking the oil fumes and preventing them from escaping through this gap, thus affecting the overall smoke extraction effect.

[0015] Furthermore, to achieve a slim profile when the range hood is off, the air inlet plate can be in a first state and a second state. When the range hood is off, the air inlet plate is in the first state and retracted into the movable housing, with the smoke baffle covering the air inlet. When the range hood is on, the air inlet plate is in the second state and exposed in the movable housing, with the smoke baffle opening the air inlet, forming a smoke-collecting chamber between the smoke baffle and the air inlet plate.

[0016] Furthermore, the air inlet plate includes a first top plate and an air inlet plate body. The first top plate extends rearward from the upper end of the air inlet plate body, and the air inlet is formed on the air inlet plate body. Since the air inlet plate needs to be located between the smoke baffle and the movable housing, by including the first top plate in the air inlet plate, the top of the air inlet plate body can be prevented from being exposed in the movable housing, thus avoiding top leakage.

[0017] Furthermore, the air inlet plate also includes a first left side plate disposed on the left side of the air inlet plate body and a first right side plate disposed on the right side of the air inlet plate body, wherein the first left side plate and the first right side plate extend rearward from the side of the first top plate. Since the air inlet plate needs to be disposed between the smoke baffle and the movable box, by making the air inlet plate include left and right side plates, it is possible to avoid the side plates of the air inlet plate being exposed in the movable box and causing leakage on the left and right sides.

[0018] Furthermore, when the range hood is in the open state, the frontmost end of the movable housing is located in front of the rearmost end of the first top plate of the air inlet plate, so as to avoid the gap between the top of the air inlet plate and the movable housing that would cause oil fume leakage.

[0019] Furthermore, the movable housing includes a second top plate. When the air inlet plate is in the first state, the first top plate is located below the second top plate. When the air inlet plate is in the second state, the foremost end of the second top plate of the movable housing is located in front of the rearmost end of the first top plate of the air inlet plate. Since the movable housing rotates forward to open, it needs to include a second top plate to form a closed air inlet channel during operation. By defining the relationship between the top plate of the movable housing and the top plate of the air inlet plate, gaps between the top of the air inlet plate and the movable housing are further prevented from causing oil fume leakage.

[0020] Furthermore, the movable housing also includes a third top plate, which extends rearward and gradually downward from the front end of the second top plate. When the air inlet plate is in the first state, the rear end of the first top plate is located below the rear end of the third top plate. When the air inlet plate is in the second state, the rear end of the first top plate is located below the front end of the third top plate. The first top plate is at least partially located within the movable housing and extends forward and gradually downward from the front end of the movable housing. The inclined extension of the third top plate can guide the flow of oil fumes, promoting their entry into the housing.

[0021] Furthermore, when the air inlet plate is in the first state, the rear end of the first top plate is located in front of the rear end of the third top plate, so that the air inlet plate can also receive the oil in the movable box to avoid direct dripping.

[0022] Furthermore, taking a vertical plane in the front-to-back direction as a section, on this plane: when the movable box is closed and the air inlet plate is in the first state, the rear endpoint of the third top plate of the movable box is recorded as point A and the front endpoint as point B, and the rear endpoint of the first top plate of the air inlet plate is recorded as point C; when the movable box is open and the air inlet plate is in the second state, the rear endpoint of the third top plate of the movable box is recorded as point A1 and the front endpoint as point B1, the rear endpoint of the first top plate of the air inlet plate is recorded as point C1, and the front endpoint of the first top plate of the air inlet plate is recorded as point O3. The points satisfy the following relationship:

[0023]

[0024] Where θ is the angle between the two lines connecting C1O3 and O1O3.

[0025] This avoids situations where point C is located outside the movable box, or where the safe distance between point C and AB is insufficient, which could easily lead to interference.

[0026] Furthermore, the range hood also includes an upper housing, in which a fan is installed, and the second top plate is located on the left and right sides of the bottom of the upper housing, thereby facilitating communication between the movable housing and the upper housing.

[0027] Furthermore, the movable box is nested outside the fixed box. The movable box also includes a second left side plate and a second right side plate arranged on the left and right sides respectively. The second top plate is located between the second left side plate and the second right side plate. A reinforcing plate is also provided between the second left side plate and the second right side plate, and the reinforcing plate is lower than the second top plate. Since the movable box is on the outside, it is divided by the inner fixed box and the upper box, resulting in a relatively weak overall strength of the box. The strength of the movable box is enhanced by providing a reinforcing plate.

[0028] Furthermore, the bottom surface of the reinforcing plate gradually slopes upwards from the left and right sides towards the center. By setting the sloped bottom surface of the reinforcing plate, the oil fumes from the left and right sides can flow towards the center and quickly enter the upper chamber, while also guiding the oil condensed on it to both sides when closed.

[0029] Furthermore, the movable housing also includes a third top plate, which extends rearward and gradually downward from the front end of the second top plate. The inclined third top plate guides the oil that has condensed on the first and second top plates backward.

[0030] Furthermore, the range hood also includes a motion mechanism, which includes a first drive mechanism, a first drive arm driven to rotate by the first drive mechanism, and a first connecting rod rotatably connected to the first drive arm. The first drive arm is rotatably connected to the upper housing and its rotation center is located on the upper housing. The first connecting rod is also rotatably connected to the first drive arm and the movable housing, respectively.

[0031] The motion mechanism also includes a mounting plate and a second rotating shaft, the second rotating shaft extending along the left and right direction of the range hood, the mounting plate and the first drive arm being rotatably connected to the second rotating shaft, and the mounting plate being fixed to the air inlet plate.

[0032] Therefore, the linkage between the air inlet plate, the movable box and the smoke baffle can be realized through a set of motion mechanism, which is simple in structure and low in cost.

[0033] Furthermore, taking a vertical plane in the forward and backward direction as a cross-section, on this plane: the center of the rotational connection between the first drive arm and the first connecting rod is the third rotational center, the center of rotation at the rotational connection between the first connecting rod and the movable housing is the fourth rotational center, the distance between the first rotational center and the third rotational center is l1, the distance between the third rotational center and the fourth rotational center is l2, the distance between the fourth rotational center and the second rotational center is l3, and the distance between the first rotational center and the second rotational center is l4, and satisfies:

[0034] And 52.3≤[(l4+l2)-(l1+l3)]≤73.3.

[0035] This makes it easier to control the gap between the smoke baffle and the movable box when they are opened.

[0036] Compared with the prior art, the advantages of the present invention are: by setting an air inlet plate, it fills the gap between the smoke baffle and the movable box when the range hood is turned on, thus blocking the oil fumes and preventing the oil fumes from escaping from this gap and affecting the overall smoke extraction effect. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the closed state of the range hood according to the first embodiment of the present invention;

[0038] Figure 2 This is a schematic diagram of the closed state of the range hood according to the first embodiment of the present invention (viewed from back to front);

[0039] Figure 3 This is a side view of the range hood in the closed state according to the first embodiment of the present invention;

[0040] Figure 4 This is a cross-sectional view of the range hood in the closed state according to the first embodiment of the present invention;

[0041] Figure 5 This is a schematic diagram of the range hood in the open state according to the first embodiment of the present invention;

[0042] Figure 6This is a side view of the range hood in the open state according to the first embodiment of the present invention;

[0043] Figure 7 This is a cross-sectional view of the range hood in the open state according to the first embodiment of the present invention;

[0044] Figure 8 This is a schematic diagram of the lower casing of the range hood according to the first embodiment of the present invention;

[0045] Figure 9 This is an exploded structural diagram of the lower casing of the range hood according to the first embodiment of the present invention;

[0046] Figure 10 This is a schematic diagram of the opening and closing plate and the moving mechanism of the range hood according to the first embodiment of the present invention;

[0047] Figure 11 This is a cross-sectional view (section and cross-section) of the range hood in the open state according to the first embodiment of the present invention. Figure 7 parallel);

[0048] Figure 12 This is a cross-sectional view (left-right section) of the range hood in the open state according to the first embodiment of the present invention;

[0049] Figure 13 This is a partially simplified schematic diagram of the range hood in the open state according to the first embodiment of the present invention;

[0050] Figure 14 This is a simplified schematic diagram of the four-bar linkage mechanism of the range hood in the closed state according to the first embodiment of the present invention;

[0051] Figure 15 This is a simplified schematic diagram of the four-bar linkage mechanism of the range hood in the open state according to the first embodiment of the present invention;

[0052] Figure 16 This is a schematic diagram of the opening and closing plate and the moving mechanism of the range hood according to the second embodiment of the present invention;

[0053] Figure 17 This is a schematic diagram of the closed state of the range hood according to the third embodiment of the present invention (hiding the upper housing, fan and opening / closing plate);

[0054] Figure 18 This is a schematic diagram of the range hood in the open state according to the third embodiment of the present invention (with the upper housing, fan and opening / closing plate hidden);

[0055] Figure 19 This is a schematic diagram of the motion mechanism of the range hood according to the third embodiment of the present invention. Detailed Implementation

[0056] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0057] In the description of this invention, it should be 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," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this invention can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0058] Example 1

[0059] See Figures 1-9 A range hood includes a lower housing and an upper housing 2 disposed above the lower housing. The lower housing includes a movable housing 11 and a fixed housing 12. The movable housing 11 includes a second top plate 111, a second left side plate 112, and a second right side plate 113, with the second top plate 111 located between the tops of the second left side plate 112 and the second right side plate 113. The fixed housing 12 includes a fourth top plate 121, a third left side plate 122, and a third right side plate 123, with the fourth top plate 121 located between the tops of the third left side plate 122 and the third right side plate 123. The second left side plate 112 and the second right side plate 113 define the width of the movable housing 11 (here, width refers to...). Figure 1 The dimensions of the range hood shown (in the left-right direction) are defined by the distance between the second left side panel 112 and the second right side panel 113, and the width of the fixed body 12 is defined by the distance between the third left side panel 122 and the third right side panel 123. (Here, width refers to...) Figure 1 The width of the fixed housing 12 (the left-right dimension of the range hood shown) is defined by the distance between the third left side panel 122 and the third right side panel 123.

[0060] The movable housing 11 and the fixed housing 12 are nested together. In this embodiment, the movable housing 11 is fitted over the fixed housing 12. Therefore, the second top plate 111 is located above and above the fourth top plate 121, the second left side plate 112 is located to the left of the third left side plate 122, and the second right side plate 113 is located to the right of the third right side plate 123. To avoid the upper housing 2, both the second top plate 111 and the fourth top plate 121 are provided with corresponding notches. The fixed housing 12 also has a back plate 124, which is connected between the rear ends of the third left side plate 122 and the third right side plate 123, and is located on the side closest to the wall during installation. Alternatively, the movable housing 11 can be fitted inside the fixed housing 12.

[0061] The fixed housing 12 is installed and fixed to the upper housing 2. The movable housing 11 and the fixed housing 12 are rotatably connected via the first rotating shaft 14 near the bottom of the fixed housing 12. (See figure) Figure 11 The movable housing 11 can rotate relative to the fixed housing 12 about an axis extending in the left-right direction of the range hood. Any point on the center line of the first rotating shaft 14 constitutes the rotation center of the movable housing 11. When the range hood is off, the fixed housing 12 is embedded within the movable housing 11 and hardly protrudes from it. (See [reference]) Figure 3 When the range hood is turned on, the movable housing 11 rotates forward relative to the fixed housing 12, increasing the overall thickness of both the movable housing 11 and the fixed housing 12. (See attached image) Figure 6 .

[0062] By placing the first pivot 14 at the point where the two lower housings overlap significantly, the upper parts of the movable housing 11 and the fixed housing 12 nearly intersect when opened. The rear side of the second top plate 111 of the movable housing 11 and the front side of the fourth top plate 121 of the fixed housing 12 have virtually no overlapping area, with an overlap of ≤20mm. This maximizes the use of the two housings and creates the largest possible housing size after unfolding, thus solving the problem of opening the airflow channel and achieving a more unobstructed flow. Currently, without considering margin issues, a flow rate of 30-31 cubic meters per minute can be achieved. This connection method solves both the limitations of the upper air intake channel and the placement problem of the movable housing 11's hinge (first pivot 14).

[0063] A ventilation section is formed at the connection between the lower and upper housing 2, including a first ventilation opening 21 and a second ventilation opening 22 located in front of the first ventilation opening 21, and the two ventilation openings are interconnected. In a horizontal projection, the first ventilation opening 21 corresponds to the fixed housing 12, and the second ventilation opening 22 is located in front of the fixed housing 12. When the movable housing 11 rotates forward relative to the fixed housing 12 and opens, the tops of both the movable housing 11 and the fixed housing 12 correspond to the two ventilation openings.

[0064] The range hood also includes a smoke baffle 3 and an opening and closing plate 4. The smoke baffle 3 can cover the front of the movable housing 11 when the machine is off, and rotate forward and open relative to the movable housing 11 when the machine is on, thereby forming a smoke collection chamber Q between it and the front of the movable housing 11.

[0065] The hinged plate 4 is partially located within the lower housing and partially within the upper housing 2. When the smoke baffle 3 is open, the hinged plate 4 opens the first vent 21 and the second vent 22; when the smoke baffle 3 is closed, the hinged plate 4 closes the second vent 22. By incorporating the hinged plate 4, the ventilation area at the connection between the upper and lower housings is increased when the range hood is operating, thereby promoting the rapid rise of fumes and their absorption by the fan 5 within the upper housing 2. When the range hood is closed, the partial vents are shut off, allowing for an ultra-thin design in the lower housing. The hinged plate 4's partial location within the lower housing prevents fumes from leaking between the hinged plate 4 and the lower housing when open, and guides any condensed oil on the hinged plate 4 downwards when closed, preventing seepage between the hinged plate 4 and the lower housing.

[0066] The hinged plate 4 includes a first plate 41 and a second plate 42. The first plate 41 is fixed to the back of the smoke baffle 3. The second plate 42 is connected to the first plate 41 and arranged at an angle. When the smoke baffle 3 is opened, the second plate 42 extends into the upper box 2 from top to bottom and gradually tilts backward. When the smoke baffle 3 is closed, the second plate 42 is closed at the second ventilation opening 22, and the first plate 41 extends into the lower box.

[0067] The hinged panel 4 also includes a third panel 43, which is connected to the second panel 42 and arranged at an angle. When the smoke baffle 3 is closed, the third panel 43 extends upward from the front end of the second panel 42. The presence of the third panel 43 can play a role in catching oil when the range hood is closed, preventing the oil on the second panel 42 from flowing forward, but only allowing it to flow along the third panel 43, the second panel 42, and the first panel 41 until it flows into the lower housing. When the hinged panel 4 is open, the upper end of the hinged panel 4 (from...) Figure 7 The projection of the cross section shown (considered as the upper end) onto the horizontal plane onto the lower end (from...) Figure 7 The outer side of the cross-section shown (viewed as the lower end point) is the upper end of the movable box 11 after it is opened (from... Figure 7 The projection of the cross section shown (considered as the upper end) onto the horizontal plane onto the lower end (from...) Figure 7 The cross section shown is considered to be the outer side of the projection of the lower endpoint.

[0068] See Figure 7 and Figure 10The range hood also includes a motion mechanism, which comprises a first drive mechanism 61 and a transmission mechanism. The transmission mechanism includes a first drive arm 621 driven to rotate by the first drive mechanism 61. The first drive arm 621 is rotatably connected to the upper housing 2, and its rotation center is located on the upper housing 2. The opening and closing plate 4 also includes a fourth plate 44 disposed on the left and right sides of the second plate 42 and the third plate 43. By providing the fourth plate 44, the sealing performance with the left and right sides of the upper housing 2 is improved. The fourth plate 44 extends from the left and right sides of the second plate 42 and the third plate 43, respectively. The first drive arm 621 is fixedly disposed on the inner side of the fourth plate 44. The first drive arm 621 may have two sets disposed on the left and right sides of the opening and closing plate 4. The first drive mechanism 61 drives one of the first drive arms 621 to rotate, and a transmission shaft 624 may be connected between the two first drive arms 621 to achieve synchronous rotation. Thus, the first drive mechanism 61 can drive the smoke baffle 3 and the opening and closing plate 4 to rotate. The smoke baffle 3 and the opening and closing plate 4 are fixed on a first drive arm 621 of the motion mechanism, so that the first drive arm 621 of the motion mechanism, the smoke baffle 3 and the opening and closing plate 4 rotate together around the rotation point of the upper housing 2. The opening and closing plate 4 opens when the smoke baffle 3 opens, and the structural and cost costs are relatively small.

[0069] The transmission mechanism also includes a first connecting rod 622, one end of which is rotatably connected to the first drive arm 621, and the other end of which is rotatably connected to the movable housing 11, thereby linking the movable housing 11 with the smoke baffle 3 and the opening and closing plate 4. Alternatively, the movable housing 11 can also be driven independently.

[0070] When the range hood is turned on, smoke can be introduced directly through the air inlet on the movable housing 11. Alternatively, as described in this embodiment, the lower housing may also include an air inlet plate 13 mounted on the movable housing 11. The movable housing 11 is tilted forward, and the negative pressure area formed by the smoke baffle 3 is slightly upward. To improve the smoke extraction effect, the negative pressure area needs to be lowered. Therefore, the aforementioned air inlet plate 13 is provided in this embodiment. When the range hood is turned on, the air inlet 13 is located between the movable housing 11 and the smoke baffle 3, which can lower the negative pressure area into the area formed by the smoke baffle 3 and the air inlet plate 13.

[0071] The air inlet plate 13 includes a first top plate 131, a first left side plate 132, a first right side plate 133, and an air inlet plate body 134. The first top plate 131 extends from the top of the air inlet plate body 134 into the movable box 11. The first left side plate 132 extends from the left end of the air inlet plate body 134 into the movable box 11. The first right side plate 133 extends from the right end of the air inlet plate body 134 into the movable box 11. An air inlet 135 is provided on the air inlet plate body 134. The air inlet plate 13 can also rotate relative to the movable housing 11. It can be driven independently, or, as shown in this embodiment, the air inlet plate 13 can be rotatably connected to the movable housing 11 on the left and right sides near the bottom via rotating shafts, and the connection points can slide up and down (this is prior art, see the Chinese patent application number 202221530291.1 disclosed by the applicant). Near the top, such as at the bend between the first top plate 131 and the air inlet plate 134, the air inlet plate 13 is connected to the motion mechanism. The transmission mechanism also includes a second rotating shaft 623 connected to the first drive arm 621. The second rotating shaft 623 extends along the left and right direction of the range hood, rotatably connecting the first drive arm 621 and the air inlet plate 13, and can drive the air inlet plate 13 to rotate when the first drive arm 621 rotates. A plate 625 can be fixedly mounted on the air inlet 13, allowing the second rotating shaft 623 and the air inlet plate 13 to be rotatably connected. When the range hood is closed, the air inlet plate 13 is in the first state, where it is retracted into the movable housing 11. When the range hood is open, the air inlet plate 13 is in the second state, where it is exposed in the movable housing 11 by rotating forward. At this time, the first top plate 131, the first left side plate 132, and the first right side plate 133 are located in the movable housing 11 at least at their rear ends to prevent pressure leakage from the top and the left and right sides. The smoke collection chamber Q is formed between the air inlet plate 13 and the smoke baffle plate 3.

[0072] When the air inlet plate 13 is in the first state, the first top plate 131 is located below the second top plate 111. When the air inlet plate 13 is in the second state, the foremost end of the second top plate 111 of the movable box 11 is located in front of the last end of the first top plate 131 of the air inlet plate 13.

[0073] The movable housing 11 also includes a third top plate 114, which extends rearward and gradually downward from the front end of the second top plate 111, guiding the condensed fumes on the second and third top plates 111 and third top plates 114 backward. When the air inlet plate 13 is in the first state, the rear end of the first top plate 131 is located below or in front of the rear end of the third top plate 114. When the air inlet plate 13 is in the second state, the rear end of the first top plate 131 is located below the front end of the third top plate 114. The first top plate 131 is at least partially located inside the movable housing 11 and extends forward and gradually downward from the front end of the movable housing 11. The inclined extension of the first top plate 131 can guide the fumes and promote their entry into the housing.

[0074] Since the second top plate 111 is disconnected from the upper housing 2, in order to strengthen the movable housing 11, a reinforcing plate 115 is also included, connected between the second left side plate 112 and the second right side plate 113, and lower than the second top plate 111. The bottom of the reinforcing plate 115 gradually slopes upward from the left and right sides towards the middle, which can promote the flow of oil fumes from the left and right sides towards the middle and quickly enter the upper housing 2, and at the same time guide the oil condensed on it to both sides when closed.

[0075] With the above structure, when the range hood is closed, the lower box remains thin, and the internal channel is only about 30mm. When it is open, the movable box 11, the air inlet plate 13, the opening and closing plate 4, and the smoke baffle 3 open in conjunction, forming an air inlet channel with a cross-section that gradually increases from bottom to top inside the range hood. The front and back depth of the ventilation section can reach 130mm.

[0076] In this embodiment, the first drive mechanism 61 is an electric push rod. Since it is placed in the oil circuit, a bellows can be installed outside the push rod for protection. See also Figure 12 The first drive mechanism 61 is placed in the space between the bottom of the fan 5 and the corresponding wall of the upper housing 2, thus not affecting the air intake area after the oil fumes enter the upper housing 2, and not affecting the oil fume extraction effect. Furthermore, the first drive mechanism 61 has ample room to move in this location, allowing for adjustments to the length (lever arm) of the push rod, reducing the requirements on its mechanical properties and thus extending its service life. If the first drive mechanism 61 were placed in the lower housing, the push rod would need to be in an inverted position, increasing the risk of oil and water ingress. The push rod would also be bulky at the worm gear position, requiring other components in the lower housing to be positioned to avoid it, and the first drive mechanism 61 would be visible from the air inlet 135. Placing the first drive mechanism 61 in the middle between the fan 5 and the upper housing 2 would affect the smoke extraction effect and would be inconvenient for assembly.

[0077] To ensure the overall thinness of the lower housing while maintaining effective smoke extraction, the movable housing 11 must tilt forward to increase the working passage. For ease of description, the points described below are points on the contours of each component. Since the thickness of the fixed housing 12 is fixed, the rotation of the top of the movable housing 11 is also fixed, meaning the front edge of the top of the movable housing 11 moves from point A' to point A1'. When the smoke baffle 3 is opened, to prevent smoke from escaping through the gap between the smoke baffle 3 and point A1', the gap must be 2-3 mm. Since this embodiment includes an air inlet plate 13, the gap can be controlled at the hinge position of the air inlet plate 13, and the gap between point A1' and the smoke baffle 3 can be appropriately widened to reduce the constraints of the dimensional chain.

[0078] Because the movable box 11 needs to tilt forward, and has a section in the middle through which the bottom of the upper box 2 passes (the upper box 2 passes through and connects to the fixed box 12), the second top plate 111 of the movable box 11 is divided into two parts, located on the left and right sides of the upper box 2 respectively, resulting in the movable box 11 forming a U-shape. See [reference needed]. Figure 9 If the rotation center of the first drive arm 621 is placed at point A1', the movable housing 11, due to its large left-right span and the broken middle structure, will have limited torque transmission, leading to unstable movement. This could result in the drive end (the side with the first drive mechanism 61, directly driven by it; in this embodiment, the right side) opening while the driven end remains closed. Therefore, in this embodiment, the rotation center of the first drive arm 621 is set at point O1 (denoted as the first rotation center O1, a point on a vertical plane in the front-back direction, the same below). Since there are no other moving parts here, the transmission shaft 624 can be placed. The transmission shaft 624 distributes the torque of the drive end to the left and right ends of the movable housing 11, ensuring the synchronicity of movement at both ends. Placing the first rotation center O1 on the housing 2 also amplifies the mechanical parameters of each part, reducing the stress on the hinge points of the moving components by amplifying the torque, thus improving the overall service life of the machine under the same material conditions. The first rotation center O1 is the rotation center of the smoke baffle 3 and the opening and closing plate 4.

[0079] The rotation center of the movable housing 11 is the second rotation center O2. (See also...) Figure 13The points described below are all points on a vertical plane in the front-to-back direction. When the movable housing 11 is closed and the air inlet plate 13 is in the first state, the rear end point of the third top plate 114 of the movable housing 11 is recorded as point A and the front end point is recorded as point B (the figure shows the open state, so the position of the third top plate 114 in the closed state is shown as a dashed line), and the rear end point of the first top plate 131 of the air inlet plate 13 is recorded as point C; when the movable housing 11 is open and the air inlet plate 13 is in the second state, the rear end point of the third top plate 114 of the movable housing 11 is recorded as point A1 and the front end point is recorded as point B1, the rear end point of the first top plate 131 of the air inlet plate 13 is recorded as point C1, and the front end point of the first top plate 131 of the air inlet plate 13 is recorded as point O3. The above points satisfy the following relationship:

[0080]

[0081] Where θ is the angle between the two lines connecting C1O3 and O1O3. By satisfying the above conditions, it is possible to avoid point C being located outside the movable box 11, or the safe distance between point C and AB being insufficient, which could easily lead to interference.

[0082] When the range hood is off, the overall depth (front-to-back dimension) of the lower housing is 80mm. To ensure the overall smoke extraction performance, given that the width of the fan 5 is 420mm, the transmission mechanism needs to be pressed to position itself outside the opening plate 4, resulting in a smaller width (left-to-right dimension) of the ventilation section, only 382mm. In this case, the depth of the ventilation section when open must be no less than 120mm. Furthermore, because the movable housing 11 of the lower housing needs to overlap with the fixed housing 12 during rotation (the overlap is mainly used to seal the internal smoke passage), the opening positions of the movable housing 11 and the smoke baffle 3 are essentially fixed.

[0083] To ensure a neat and aesthetically pleasing overall appearance when closed, the gap between the movable housing 11 and the smoke baffle 3 should be 1mm to 2mm. During the opening of the smoke baffle 3, point A1' on the movable housing 11 should not interfere with the back of the smoke baffle 3, so the distance between point A1' and the smoke baffle 3 should be ≥3mm.

[0084] Therefore, the following constraints are imposed on the relationships between the motion mechanism and moving parts to meet the above requirements. See also... Figure 14 and Figure 15 The movable housing 11, the smoke baffle 3, the first drive arm 621, and the upper housing 2 constitute a four-bar linkage. The center of the rotational connection between the first drive arm 621 and the first connecting rod 622 is the third rotational center B', and the rotational center of the rotational connection between the first connecting rod 622 and the movable housing 11 is the fourth rotational center C'.

[0085] The distance between the first rotation center O1 and the third rotation center B' is l1, the distance between the third rotation center B' and the fourth rotation center C' is l2, the distance between the fourth rotation center C' and the second rotation center O2 is l3, and the distance between the first rotation center O1 and the second rotation center O2 is l4. For ease of comparison, when measuring these distances, each rotation center can be projected onto the same vertical plane extending along the front-to-back direction of the range hood (and...). Figure 11 The measurement is then performed after the cross-section is parallel to the target. In the closed state, the included angle between the first drive arm 621 and the first connecting rod 622 is α.

[0086] To meet the above clearance requirements, it is necessary to satisfy... And 52.3mm ≤ [(l4+l2)-(l1+l3)] ≤ 73.3mm; if If ∠α is close to 180°, the entire machine can easily deform beyond 180°, potentially causing mechanical jamming. If If the gap d > 10mm, and there is no air inlet plate 13 when d > 5mm, the air leakage and pressure loss due to the top gap will seriously affect the performance of the fan.

[0087] Example 2

[0088] See Figure 16 In this embodiment, the difference from the first embodiment is that the first drive mechanism 61 is a motor. To avoid the motor being affected by oil fumes, a protective shell can be installed on the outside of the motor.

[0089] Example 3

[0090] See Figures 17-19 In this embodiment, the difference from the first embodiment is that the motion mechanism also includes a second drive mechanism 63 and a second drive arm 626, so that the movable box 11, the air inlet 13 and the smoke baffle 3 can be driven respectively.

[0091] Specifically, the first drive mechanism 61 drives the first drive arm 621, while the smoke baffle 3 remains fixed to the first drive arm 621. The second drive mechanism 63 drives the second drive arm 626, and the first connecting rod 622 and the second rotating shaft 623 are respectively connected to the second drive arm 626. The second drive mechanism 63 is preferably a motor. There are two second drive arms 626, each rotatably connected to a transmission shaft 624, allowing the second drive arm 626 to rotate about a fixed axis around the transmission shaft 624, thus defining the trajectory of the second drive arm 626. The rotation axes of the first drive arm 621 and the second drive arm 626 can be parallel or coincident. The second drive mechanism 63 can drive the second drive arm 626 via a linkage mechanism. The linkage mechanism includes a second link 627 and a third link 628 connected end-to-end (the connection is rotatable, preferably hinged). The second link 627 is driven to rotate by the output shaft of the second drive mechanism 63, with the rotation axis along the left-right direction of the range hood. The third link 628 is rotatably connected to the second drive arm 626, preferably hinged, thereby driving the second drive arm 626 to rotate. Optionally, other transmission methods in the prior art, such as gear sets, can also be used.

[0092] When the range hood is in the off state, the smoke baffle 3, the air inlet plate 13, and the movable housing 11 are all closed together, achieving an ultra-thin state, as in Embodiment 1. The range hood has a partially open state and a fully open state. When in the partially open state, the smoke baffle 3 is open, while the movable housing 11 and the air inlet plate 13 remain stationary. When in the fully open state, the smoke baffle 3, the movable housing 11, and the air inlet plate 13 are all open, as in Embodiment 1. When opening, the first drive mechanism 61 and the second drive mechanism 62 can be driven simultaneously, and the opening speed of the smoke baffle 3 is greater than or equal to that of the movable housing 11, to prevent the movable housing 11 from hitting the smoke baffle 3.

[0093] The lower housing, smoke baffle 3, opening and closing plate 4, and fan 5 mentioned above can all be controlled by a voice module. A controller, voice receiving module, and voice parsing module can be installed on the range hood. The voice receiving module receives user commands, and the voice parsing module parses the commands. Based on the parsed commands, the controller controls the corresponding drive mechanisms of the lower housing, smoke baffle 3, opening and closing plate 4, and fan 5 to perform corresponding operations, thereby realizing intelligent control of the range hood and improving the user experience.

Claims

1. A range hood, comprising: Fixed housing (12); The movable housing (11) is nested with the fixed housing (12) and can rotate relative to the fixed housing (12). When the range hood is in the open state, the overlap between the fixed housing (12) and the movable housing (11) is greater than the overlap when the range hood is in the closed state; and The smoke baffle (3) can rotate relative to the fixed box (12). Taking the vertical plane in the front and back direction as the cross section, on this plane: the rotation center of the smoke baffle (3) is the first rotation center (O1), and the rotation center of the movable box (11) is the second rotation center (O2). Its features are: The range hood also includes an air inlet plate (13), on which an air inlet (135) is provided. When the range hood is in the open state, the air inlet plate (13) is located between the smoke baffle plate (3) and the movable box (11).

2. The range hood according to claim 1, characterized in that: The air inlet plate (13) can be in a first state and a second state. When the range hood is closed, the air inlet plate (13) is in the first state and is stored in the movable box (11), and the smoke baffle (3) covers the air inlet (135). When the range hood is open, the air inlet plate (13) is in the second state and is exposed in the movable box (11), and the smoke baffle (3) opens the air inlet (135). A smoke collection chamber is formed between the smoke baffle (3) and the air inlet plate (13).

3. The range hood according to claim 2, characterized in that: The air inlet plate (13) includes a first top plate (131) and an air inlet plate body (134). The first top plate (131) extends rearward from the upper end of the air inlet plate body (134), and the air inlet (135) is opened on the air inlet plate body (134).

4. The range hood according to claim 3, characterized in that: The air inlet plate (13) also includes a first left side plate (132) disposed on the left side of the air inlet plate body (134) and a first right side plate (133) disposed on the right side of the air inlet plate body (134), wherein the first left side plate (132) and the first right side plate (133) extend rearward from the side of the first top plate (131).

5. The range hood according to claim 3, characterized in that: When the range hood is in the open state, the frontmost end of the movable box (11) is located in front of the rearmost end of the first top plate (131) of the air inlet plate (13).

6. The range hood according to claim 5, characterized in that: The movable housing (11) includes a second top plate (111). When the air inlet plate (13) is in the first state, the first top plate (131) is located below the second top plate (111). When the air inlet plate (13) is in the second state, the foremost end of the second top plate (111) of the movable housing (11) is located in front of the rearmost end of the first top plate (131) of the air inlet plate (13).

7. The range hood according to claim 6, characterized in that: The movable housing (11) also includes a third top plate (114), which extends backward and gradually downward from the front end of the second top plate (111). When the air inlet plate (13) is in the first state, the rear end of the first top plate (131) is located below the rear end of the third top plate (114). When the air inlet plate (13) is in the second state, the rear end of the first top plate (131) is located below the front end of the third top plate (114). The first top plate (131) is at least partially located inside the movable housing (11) and extends forward and gradually downward from the front end of the movable housing (11).

8. The range hood according to claim 7, characterized in that: When the air inlet plate (13) is in the first state, the rear end of the first top plate (131) is located in front of the rear end of the third top plate (114).

9. The range hood according to claim 7, characterized in that: Taking a vertical plane in the front-to-back direction as a cross section, on this plane: when the movable box (11) is closed and the air inlet plate (13) is in the first state, the rear end point of the third top plate (114) of the movable box (11) is recorded as point A and the front end point is recorded as point B, and the rear end point of the first top plate (131) of the air inlet plate (13) is recorded as point C; when the movable box (11) is open and the air inlet plate (13) is in the second state, the rear end point of the third top plate (114) of the movable box (11) is recorded as point A1 and the front end point is recorded as point B1, the rear end point of the first top plate (131) of the air inlet plate (13) is recorded as point C1, and the front end point of the first top plate (131) of the air inlet plate (13) is recorded as point O3. Each point satisfies the following relationship: Where θ is the angle between the two lines connecting C1O3 and O1O3.

10. The range hood according to claim 6, characterized in that: The range hood also includes an upper housing (2), a fan is installed inside the upper housing (2), and the second top plate (111) is installed on the left and right sides of the bottom of the upper housing (2).

11. The range hood according to claim 10, characterized in that: The movable box (11) is nested outside the fixed box (12). The movable box (11) also includes a second left side plate (112) and a second right side plate (113) arranged on the left and right sides. The second top plate (111) is located between the second left side plate (112) and the second right side plate (113). A reinforcing plate (115) is also provided between the second left side plate (112) and the second right side plate (113). The reinforcing plate (115) is lower than the second top plate (111).

12. The range hood according to claim 11, characterized in that: The bottom surface of the reinforcing plate (115) gradually slopes upward from the left and right sides toward the middle.

13. The range hood according to claim 6, characterized in that: The movable box (11) also includes a third top plate (114), which extends backward and gradually downward from the front end of the second top plate (111).

14. The range hood according to claim 2, characterized in that: The range hood also includes a motion mechanism, which includes a first drive mechanism (61), a first drive arm (621) driven to rotate by the first drive mechanism (61), and a first connecting rod (622) rotatably connected to the first drive arm (621). The first drive arm (621) is rotatably connected to the upper housing (2) and its rotation center is located on the upper housing (2). The first connecting rod (622) is also rotatably connected to the first drive arm (621) and the movable housing (11) respectively. The motion mechanism also includes a mounting plate (625) and a second rotating shaft (623), the second rotating shaft (623) extending along the left and right direction of the range hood, the mounting plate (625) and the first drive arm (621) being rotatably connected to the second rotating shaft (623), and the mounting plate (625) being fixed to the air inlet plate (13).

15. The range hood according to claim 14, characterized in that: Taking a vertical plane in the front-back direction as a cross section, on this plane: the center of the rotational connection between the first drive arm (621) and the first connecting rod (622) is the third rotational center (B'), the rotational center of the rotational connection between the first connecting rod (622) and the movable housing (11) is the fourth rotational center (C'), the distance between the first rotational center (O1) and the third rotational center (B') is l1, the distance between the third rotational center (B') and the fourth rotational center (C') is l2, the distance between the fourth rotational center (C') and the second rotational center (O2) is l3, the distance between the first rotational center (O1) and the second rotational center (O2) is l4, and satisfies: And 52.3≤[(l4+l2)-(l1+l3)]≤73.3.

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