A range hood and a control method thereof

Abstract

The present application relates to a kind of range hood and its control method, wherein range hood includes: fume collecting hood, including the front plate in front side, the main air inlet is opened in the front plate;Smoke baffle is arranged before the main air inlet in the way that its top edge can be rotated around left and right extending straight line as pivot, to open or close main air inlet;Characterized in that: the front plate is also opened in the main air inlet above Auxiliary air inlet, and range hood further includes: baffle, in the way that can be moved up and down relative to front plate, is constrained on fume collecting hood, to open or close auxiliary air inlet.This range hood can be sucked through auxiliary air inlet before the smoke baffle is deflected and opens main air inlet, and solve the problem of oil fume escape when just starting, improve user cooking experience;And in the process that smoke baffle opens main air inlet, baffle can also open auxiliary air inlet simultaneously, to improve the exhaust capacity of range hood.

Description

Technical Field

[0001] This invention relates to the field of oil fume purification technology, and in particular to an oil fume extractor and its control method. Background Technology

[0002] A range hood is a kitchen appliance designed to purify the kitchen environment. It works on the principle of fluid dynamics, using a centrifugal fan installed inside to draw in and exhaust cooking fumes. The centrifugal fan consists of a casing, an impeller housed within the casing, and a motor that drives the impeller. As the impeller rotates, a negative pressure is generated at the center of the fan, drawing in the cooking fumes from below. After being accelerated by the fan, the fumes are collected by the casing and guided outwards.

[0003] Range hoods typically consist of a smoke collection hood and a smoke baffle. The front of the smoke collection hood has an air inlet, and the smoke baffle is rotatably positioned in front of the air inlet, thus opening or closing the main air inlet. Currently, most of the mechanisms driving the smoke baffle are motor-driven. To maintain smooth operation and low noise, these mechanisms are generally designed with a few seconds of opening time. If a user forgets to turn on the range hood before the smoke is generated, and then turns it on when they see the smoke, some smoke will escape because the operating time of the mechanism is relatively long, and the fan system only starts when the mechanism is almost fully open. This results in some smoke escaping each time the range hood is forgotten to be turned on.

[0004] Currently, the solutions to this problem on the market are relatively simple. Existing technologies mostly address the issue of oil fume escape by increasing the air intake volume and focusing on high feedback in the motor. For example, the Chinese utility model patent "A Range Hood" (patent number ZL 202021509786.7, authorization announcement number CN 212644716U) increases the air intake volume and improves the range hood's smoke extraction capacity by setting a second air inlet, allowing oil fumes to enter through the side and top of the range hood, thereby maintaining the same fan power. However, existing technologies still require the fan to be turned on to solve the problem of oil fume escape, thus failing to address the issue of oil fume escape before the range hood is turned on, which affects the user's cooking experience.

[0005] Therefore, further improvements to existing technologies are needed. Summary of the Invention

[0006] The first technical problem to be solved by the present invention is to provide a range hood that can solve the problem of oil fume escape before the rotating smoke baffle is opened, in contrast to the above-mentioned prior art.

[0007] The second technical problem to be solved by the present invention is to provide a control method for the above-mentioned range hood, so that the smoke extraction has higher reliability.

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

[0009] A smoke hood includes a front panel located on the front side, wherein a main air inlet is provided on the front panel;

[0010] The smoke baffle is positioned in front of the main air inlet in such a way that its top edge can rotate around a straight line extending to the left and right as a pivot, thereby opening or closing the main air inlet;

[0011] The feature is that: an auxiliary air inlet is also provided on the front panel above the main air inlet, and the range hood further includes:

[0012] The baffle is constrained on the smoke hood in a way that allows it to move up and down relative to the front panel, thereby opening or closing the auxiliary air inlet.

[0013] To achieve better smoke extraction performance, the smoke collection hood is further provided with an air storage chamber. The air storage chamber has a smoke inlet that is opposite to the auxiliary air inlet and a smoke outlet that is connected to the smoke collection hood. The baffle is constrained to the back of the front plate and has a first state of closing the smoke inlet to isolate the smoke inlet and the auxiliary air inlet, and a second state of opening the smoke inlet to connect the smoke inlet and the auxiliary air inlet.

[0014] Furthermore, the smoke hood is provided with a first drive mechanism for driving the baffle to move up and down relative to the front plate.

[0015] To enable the baffle to open or close the auxiliary air inlet, the baffle includes a first baffle and a second baffle connected to the first baffle. The second baffle is arranged side by side with the front plate. The first driving mechanism is driven and connected to the first baffle so that the first baffle can move up and down relative to the front plate under the drive of the first driving mechanism, and drive the second baffle to open or close the auxiliary air inlet.

[0016] Preferably, the back of the front plate is provided with a fixing plate extending along the length of the baffle. The first baffle and the fixing plate are arranged one above the other. The first driving mechanism includes a first motor disposed on the first baffle and a first lead screw connected to the first motor. The first lead screw extends toward the fixing plate. The fixing plate is provided with a threaded hole for the first lead screw to be threadedly connected.

[0017] To improve the efficiency of the second baffle in closing the auxiliary air inlet, the first baffle is provided with a guide post extending toward the fixed plate, and the fixed plate is provided with a through hole for the guide post to pass through. The first baffle and the fixed plate are also provided with elastic elements sleeved on each guide post. The elastic elements act on the first baffle, so that the first baffle always has the tendency to move away from the fixed plate, thereby causing the second baffle to close the auxiliary air inlet.

[0018] To ensure the smooth movement of the first smoke barrier, preferably, there are at least two guide posts spaced apart along the length of the first baffle, and each guide post is fitted with an elastic element.

[0019] To ensure that the fumes from the smoke inlet are discharged from the gas storage chamber, the smoke collection hood is also equipped with:

[0020] The first sliding plate is constrained to the gas storage chamber;

[0021] The second sliding plate is constrained to the gas storage chamber and is arranged side by side with the first sliding plate;

[0022] The second driving mechanism is connected to the first sliding plate and the second sliding plate and is used to bring the first sliding plate and the second sliding plate closer together to close the smoke outlet, or to move the first sliding plate and the second sliding plate further apart to open the smoke outlet.

[0023] To simplify the driving method of the first and second sliding plates, the second driving mechanism includes:

[0024] Second motor;

[0025] The second lead screw is connected to the second motor drive. The second lead screw extends along the vertical direction of the first sliding plate and the second sliding plate. The second lead screw has a first threaded section near the first sliding plate and a second threaded section near the second sliding plate. The thread directions of the first threaded section and the second threaded section are opposite.

[0026] A first nut is threadedly connected to a second lead screw and mounted on a first sliding plate; the thread direction of the first nut is the same as that of the first threaded section.

[0027] The second nut is threadedly connected to the second lead screw and installed on the second sliding plate. The thread direction of the second nut is the same as that of the second threaded section.

[0028] To ensure smooth movement of the first and second sliding plates, at least two second lead screws are provided, spaced apart along the left and right directions of the first and second sliding plates.

[0029] To enable the auxiliary air inlet to function, the gas storage chamber is equipped with a pressure detection module for detecting pressure. The range hood also includes a controller connected to the pressure detection module, the first drive mechanism, and the second drive mechanism. The controller is configured to control the first drive mechanism and the second drive mechanism to perform corresponding actions based on the detection results of the pressure detection module, thereby opening or closing the auxiliary air inlet.

[0030] To create negative pressure in the gas storage chamber for smoke exhaust, a fan frame is provided above the smoke collection hood. A fan system is provided inside the fan frame. The fan system includes a volute with an air inlet and an air outlet, an impeller located inside the volute, and a third motor for driving the impeller. The smoke outlet of the gas storage chamber is positioned opposite to the air inlet of the volute.

[0031] The technical solution adopted by the present invention to solve the second technical problem mentioned above is: a control method for the above-mentioned range hood, characterized by comprising the following steps:

[0032] Step 1: Turn on the range hood;

[0033] Step 2: Determine if the smoke baffle is fully open. If yes, proceed to Step 3; otherwise, proceed to Step 4.

[0034] Step 3: Record the first time t1 = 0, and proceed to step 5;

[0035] Step 4: Obtain the time required for the smoke baffle to open to the correct position, and assign this time as the first time t1;

[0036] Step 5: Obtain the preset start-up delay time of the fan system after the smoke baffle is fully opened, and record this time as the second time t2;

[0037] Step 6: Obtain the current pressure p1 in the gas storage chamber;

[0038] Step 7: Obtain the air inlet area s1 required for the pressure in the gas storage chamber to drop from p1 to the preset pressure p2 over a time period t1+t2;

[0039] Step 8: Control the baffle to open the auxiliary air inlet and make the inlet area of ​​the auxiliary air inlet equal to s1;

[0040] Step 9: Determine if the time t for the user to start timing after clicking the button to turn on the range hood is greater than or equal to t1+t2. If yes, proceed to step 10; otherwise, proceed to step 2.

[0041] Step 10: Turn on the fan system;

[0042] Step 11: Determine if the time t from when the user clicks the button to turn on the range hood is greater than or equal to t3, where t3 is the time required from when the user clicks the button to turn on the range hood until the fan system extracts the gas from the gas storage chamber. If yes, control the baffle to close the auxiliary air inlet and end the process; otherwise, proceed to step 10.

[0043] Since the control logic for turning off and on a range hood is different, the corresponding control methods are also different. Before step 1, the following steps are also included: the range hood receives a user command and determines whether the user command is a range hood start command. If so, it proceeds to step 1; if not, it means that the current user command is a range hood turn-off command.

[0044] Preferably, the control logic for the range hood shut-off process includes the following steps:

[0045] S1. Turn off the range hood;

[0046] S2. Determine if the smoke baffle is fully closed. If yes, proceed to S3; otherwise, continue with this step.

[0047] S2;

[0048] S3, Obtain the current pressure p4 in the gas storage chamber;

[0049] S4. Determine whether the pressure p4 in the current gas storage chamber is greater than or equal to p3, where p3 is the preset pressure value that the gas storage chamber needs to reach after the range hood is turned off; if yes, proceed to S8; if no, proceed to S5.

[0050] S5. Determine whether the time t4 for the user to start timing after clicking the button to turn off the range hood is greater than or equal to the preset time t5. If yes, proceed to S8; otherwise, proceed to S6.

[0051] S6. The fan system operates according to the preset current value, which can make the pressure in the gas storage chamber reach p3.

[0052] S7. Record the shutdown duration t4 of the range hood and proceed to S3;

[0053] S8. Obtain the current pressure p4 in the gas storage chamber and set p3 = p4;

[0054] S9. Control the first and second sliding plates to move closer together and close the smoke outlet;

[0055] S10. Shut down the fan system.

[0056] Compared with existing technologies, the advantages of this invention are as follows: By opening a main air inlet and an auxiliary air inlet on the front panel of the fume hood, and by using a baffle that can be moved up and down to constrain the auxiliary air inlet, the range hood can solve the problem of oil fume escape when it is first turned on by using the auxiliary air inlet before the baffle deflects and opens the main air inlet, thus improving the user's cooking experience; and while the baffle is opening or closing the main air inlet, the baffle can also open the auxiliary air inlet to enhance the range hood's smoke extraction capacity. Attached Figure Description

[0057] Figure 1 This is a schematic diagram of the structure of the range hood in an embodiment of the present invention;

[0058] Figure 2 for Figure 1 Exploded view;

[0059] Figure 3 for Figure 1 A sectional view;

[0060] Figure 4 This is a cross-sectional view of the front panel of the smoke hood and the air storage chamber in an embodiment of the present invention (with the auxiliary air inlet in the open state);

[0061] Figure 5 This is a cross-sectional view of the front panel of the smoke hood and the air storage chamber in an embodiment of the present invention (with the auxiliary air inlet closed);

[0062] Figure 6 This is an exploded view of the installation of the front panel of the smoke hood and the gas storage chamber in an embodiment of the present invention;

[0063] Figure 7 for Figure 6 Another perspective breakdown diagram;

[0064] Figure 8 for Figure 7 A schematic diagram of the installation structure of the first and second sliding plates. Detailed Implementation

[0065] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0066] like Figures 1-8 As shown, the range hood in this embodiment includes a smoke collection hood 1, a smoke baffle 2, a fan frame 10, and a baffle 3. The smoke collection hood 1 includes a front panel 11 located at the front, on which a main air inlet 111 and an auxiliary air inlet 112 located above the main air inlet 111 are provided. The smoke baffle 2 is positioned in front of the main air inlet 111 in such a way that its top edge can rotate around a straight line extending to the left and right as a pivot, thereby opening or closing the main air inlet 111. The baffle 3 is constrained on the smoke collection hood 1 in such a way that it can move up and down relative to the front panel 11, thereby opening or closing the auxiliary air inlet 112.

[0067] The smoke hood 1 is also provided with an air storage chamber 4. The air storage chamber 4 has a smoke inlet 41 that is opposite to the auxiliary air inlet 112 and a smoke outlet 42 that is connected to the smoke hood 1. The baffle 3 is constrained to the back of the front plate 11 and has a first state of closing the smoke inlet 41 to isolate the smoke inlet 41 and the auxiliary air inlet 112, and a second state of opening the smoke inlet 41 to connect the smoke inlet 41 and the auxiliary air inlet 112.

[0068] The fan frame 10 is equipped with a fan system 101. The fan system 101 includes a volute 101a with an air inlet 1011 and an air outlet 1012, an impeller 101b disposed in the volute 101a, and a third motor 101c for driving the impeller 101b to rotate. The smoke outlet 42 of the air storage chamber 4 is arranged opposite to the air inlet 1011 of the volute 101a.

[0069] like Figure 6 and Figure 7 As shown, the smoke hood 1 is equipped with a first drive mechanism 5 for driving the baffle 3 to move up and down relative to the front plate 11. In this embodiment, the baffle 3 includes a first baffle 31 and a second baffle 32 connected to the first baffle 31. The second baffle 32 is arranged side by side with the front plate 11. The first drive mechanism 5 is driven and connected to the first baffle 31 so that the first baffle 31 can move up and down relative to the front plate 11 under the drive of the first drive mechanism 5, and drive the second baffle 32 to open or close the auxiliary air inlet 112. In order to realize the installation of the first drive mechanism 5, the back of the front plate 11 is provided with a fixing plate 6 extending along the length direction of the baffle 3. The first baffle 31 and the fixing plate 6 are arranged one above the other. The first drive mechanism 5 includes a first motor 51 provided on the first baffle 31 and a first lead screw 52 driven and connected to the first motor 51. The first lead screw 52 extends toward the fixing plate 6, and the fixing plate 6 is provided with a threaded hole for the first lead screw 52 to be threadedly connected.

[0070] Other examples Figure 4 and Figure 5 As shown, the first baffle 31 is provided with guide posts 7 extending toward the fixed plate 6. The fixed plate 6 has through holes 61 for the guide posts 7 to pass through. The first baffle 31 and the fixed plate 6 are also provided with elastic elements 8 sleeved on each guide post 7. The elastic elements 8 act on the first baffle 31, so that the first baffle 31 always has a tendency to move away from the fixed plate 6, causing the second baffle 32 to close the auxiliary air inlet 112. In this embodiment, the elastic element 8 is a spring. There are at least two guide posts 7, which are spaced apart along the length of the first baffle 31. Figure 7 There are two guide pillars 7, and each guide pillar 7 is fitted with an elastic element 8.

[0071] like Figure 4 and Figure 5 As shown, the smoke hood 1 is also equipped with a first sliding plate 91, a second sliding plate 92, and a second driving mechanism. The first sliding plate 91 and the second sliding plate 92 are both constrained on the gas storage chamber 4, and the second sliding plate 92 is arranged side by side with the first sliding plate 91. The second driving mechanism is drivenly connected to the first sliding plate 91 and the second sliding plate 92, and is used to bring the first sliding plate 91 and the second sliding plate 92 closer together to close the smoke outlet 42, or to move the first sliding plate 91 and the second sliding plate 92 further apart to open the smoke outlet 42.

[0072] like Figure 8 As shown, the second driving mechanism in this embodiment includes a second motor 931, a second lead screw 932, a first nut 933, and a second nut 934. The second lead screw 932 is driven and connected to the second motor 931. There are at least two second lead screws 932, which are spaced apart along the left and right directions of the first sliding plate 91 and the second sliding plate 92. Figure 8 There are two second lead screws 932. The second lead screws 932 extend along the vertical direction of the first sliding plate 91 and the second sliding plate 92. The second lead screw 932 has a first threaded section 9321 near the first sliding plate 91 and a second threaded section 9322 near the second sliding plate 92. The thread directions of the first threaded section 9321 and the second threaded section 9322 are opposite. The first nut 933 is threadedly connected to the second lead screw 932 and installed on the first sliding plate 91. The thread direction of the first nut 933 is the same as that of the first threaded section 9321. The second nut 934 is threadedly connected to the second lead screw 932 and installed on the second sliding plate 92. The thread direction of the second nut 934 is the same as that of the second threaded section 9322.

[0073] The gas storage chamber 4 is equipped with a pressure detection module for detecting pressure. The range hood also includes a controller connected to the pressure detection module, the first drive mechanism 5, and the second drive mechanism. The controller is configured to control the first drive mechanism 5 and the second drive mechanism to perform corresponding actions based on the detection results of the pressure detection module, thereby opening or closing the auxiliary air inlet 112. In this embodiment, the pressure detection module is a pressure sensor, which can generate a negative pressure in the gas storage chamber to allow the oil fumes to be drawn in and then discharged by real-time detection of the pressure in the gas storage chamber.

[0074] In this embodiment, the control method of the range hood includes: the range hood receives a user command and determines whether the user command is a range hood start command. If so, proceed to step 1; if not, it means that the current user command is a range hood turn-off command.

[0075] Step 1: Turn on the range hood;

[0076] Step 2: Determine if the smoke baffle is fully open. If yes, proceed to Step 3; otherwise, proceed to Step 4.

[0077] Determining whether the smoke baffle is fully open can be achieved by whether the smoke baffle opening time reaches the preset time or by other existing technologies such as current, which will not be elaborated here.

[0078] Step 3: Record the first time t1 = 0, and proceed to step 5;

[0079] Step 4: Obtain the time required for the smoke baffle to open to the correct position, and assign this time as the first time t1;

[0080] Step 5: Obtain the preset start-up delay time of the fan system after the smoke baffle is fully opened, and record this time as the second time t2;

[0081] Step 6: Obtain the current pressure p1 in the gas storage chamber;

[0082] Step 7: Obtain the air inlet area s1 required for the pressure in the gas storage chamber to drop from p1 to the preset pressure p2 over a time period t1+t2;

[0083] Step 8: Control the baffle to open the auxiliary air inlet and make the inlet area of ​​the auxiliary air inlet equal to s1;

[0084] Step 9: Determine if the time t for the user to start timing after clicking the button to turn on the range hood is greater than or equal to t1+t2. If yes, proceed to step 10; otherwise, proceed to step 2.

[0085] Step 10: Turn on the fan system;

[0086] Step 11: Determine if the time t from when the user clicks the button to turn on the range hood is greater than or equal to t3, where t3 is the time required from when the user clicks the button to turn on the range hood until the fan system extracts the gas from the gas storage chamber. If yes, control the baffle to close the auxiliary air inlet and end the process; otherwise, proceed to step 10.

[0087] The control logic for the range hood's shutdown process includes the following steps:

[0088] S1. Turn off the range hood;

[0089] S2. Determine if the smoke baffle is fully closed. If yes, proceed to S3; otherwise, continue with this step.

[0090] S2;

[0091] Determining whether the smoke baffle is closed in place can be achieved by whether the smoke baffle has closed for a preset time or by other existing technologies such as current, which will not be elaborated here.

[0092] S3, Obtain the current pressure p4 in the gas storage chamber;

[0093] S4. Determine whether the pressure p4 in the current gas storage chamber is greater than or equal to p3, where p3 is the preset pressure value that the gas storage chamber needs to reach after the range hood is turned off; if yes, proceed to S8; if no, proceed to S5.

[0094] S5. Determine whether the time t4 from when the user clicks the button to turn off the range hood is greater than or equal to the preset time t5. If yes, proceed to S8; otherwise, proceed to S6. Where t5 is the time required from when the user clicks the button to turn off the range hood until the pressure in the gas chamber reaches p3.

[0095] S6. The fan system operates according to the preset current value, which can make the pressure in the gas storage chamber reach p3.

[0096] S7. Record the shutdown duration t4 of the range hood and proceed to S3;

[0097] S8. Obtain the current pressure p4 in the gas storage chamber and set p3 = p4;

[0098] S9. Control the first and second sliding plates to move closer together and close the smoke outlet;

[0099] S10. Shut down the fan system.

[0100] In this embodiment, when the fan inside the range hood is not running, the auxiliary air inlet is opened to provide a certain amount of smoke extraction, improving the range hood's smoke exhaust capacity. Thus, after the user presses the command button on the range hood, it begins to extract smoke, significantly reducing the start-up delay and making the range hood more efficient. This expands the range hood's application scenarios and makes it more competitive. Furthermore, by controlling the inlet area of ​​the auxiliary air inlet, precise control is achieved from when the user presses the button until it fully starts working, resulting in higher smoke extraction reliability. Additionally, the negative pressure generated by the fan system itself enables power storage, resulting in a compact structure and stable operation. When the user sees smoke and turns on the range hood, both the main and auxiliary air inlets work simultaneously, allowing the range hood to exhibit good smoke extraction performance and greatly improving user satisfaction.

Claims

1. A range hood, comprising: The smoke hood (1) includes a front panel (11) located on the front side, and the front panel (11) is provided with a main air inlet (111); The smoke baffle (2) is set in front of the main air inlet (111) in such a way that its top edge can rotate around the straight line extending to the left and right as the axis of rotation, thereby opening or closing the main air inlet (111); The feature is that: an auxiliary air inlet (112) is also provided on the front plate (11) above the main air inlet (111), and the range hood further includes: The baffle (3) is constrained on the smoke hood (1) in a way that it can move up and down relative to the front plate (11), thereby opening or closing the auxiliary air inlet (112); The smoke hood (1) is also provided with an air storage chamber (4). The air storage chamber (4) has a smoke inlet (41) that is opposite to the auxiliary air inlet (112) and a smoke outlet (42) that is connected to the smoke hood (1). The baffle (3) is constrained to the back of the front plate (11) and has a first state of closing the smoke inlet (41) to isolate the smoke inlet (41) and the auxiliary air inlet (112) and a second state of opening the smoke inlet (41) to connect the smoke inlet (41) and the auxiliary air inlet (112). The smoke collection hood (1) is also equipped with: The first sliding plate (91) is constrained on the gas storage chamber (4); The second sliding plate (92) is constrained on the gas storage chamber (4) and is arranged side by side with the first sliding plate (91); The second driving mechanism is driven and connected to the first sliding plate (91) and the second sliding plate (92), and is used to bring the first sliding plate (91) and the second sliding plate (92) closer to each other to close the smoke outlet (42), or to move the first sliding plate (91) and the second sliding plate (92) further apart to open the smoke outlet (42).

2. The range hood according to claim 1, characterized in that: The smoke hood (1) is provided with a first drive mechanism (5) for driving the baffle (3) to move up and down relative to the front plate (11).

3. The range hood according to claim 2, characterized in that: The baffle (3) includes a first baffle (31) and a second baffle (32) connected to the first baffle (31). The second baffle (32) is arranged side by side with the front plate (11). The first drive mechanism (5) is driven to the first baffle (31) so that the first baffle (31) can move up and down relative to the front plate (11) under the drive of the first drive mechanism (5), and drive the second baffle (32) to open or close the auxiliary air inlet (112).

4. The range hood according to claim 3, characterized in that: The back of the front plate (11) is provided with a fixed plate (6) extending along the length of the baffle (3). The first baffle (31) and the fixed plate (6) are arranged one above the other. The first drive mechanism (5) includes a first motor (51) mounted on the first baffle (31) and a first lead screw (52) driven and connected to the first motor (51). The first lead screw (52) extends toward the fixed plate (6). The fixed plate (6) is provided with a threaded hole for the first lead screw (52) to be threadedly connected.

5. The range hood according to claim 4, characterized in that: The first baffle (31) is provided with guide posts (7) extending toward the fixed plate (6). The fixed plate (6) is provided with through holes (61) for the guide posts (7) to pass through. The first baffle (31) and the fixed plate (6) are also provided with elastic elements (8) sleeved on each guide post (7). The elastic elements (8) act on the first baffle (31) so that the first baffle (31) always has the tendency to move away from the fixed plate (6) and cause the second baffle (32) to close the auxiliary air inlet (112).

6. The range hood according to claim 5, characterized in that: The guide posts (7) are at least two and are spaced apart along the length of the first baffle (31), and each guide post (7) is fitted with an elastic element (8).

7. The range hood according to any one of claims 1 to 6, characterized in that: The second drive mechanism includes: Second motor (931); The second lead screw (932) is driven and connected to the second motor (931). The second lead screw (932) extends along the vertical direction of the first sliding plate (91) and the second sliding plate (92). The second lead screw (932) has a first threaded section (9321) near the first sliding plate (91) and a second threaded section (9322) near the second sliding plate (92). The thread directions of the first threaded section (9321) and the second threaded section (9322) are opposite. A first nut (933) is threadedly connected to a second lead screw (932) and mounted on a first sliding plate (91). The thread direction of the first nut (933) is the same as that of the first threaded section (9321). The second nut (934) is threadedly connected to the second lead screw (932) and installed on the second sliding plate (92). The thread direction of the second nut (934) is the same as that of the second threaded section (9322).

8. The range hood according to claim 7, characterized in that: There are at least two second lead screws (932), which are spaced apart along the left and right directions of the first sliding plate (91) and the second sliding plate (92).

9. The range hood according to claim 2, characterized in that: The gas storage chamber (4) is equipped with a pressure detection module for detecting pressure. The range hood also includes a controller connected to the pressure detection module, the first drive mechanism (5) and the second drive mechanism. The controller is configured to control the first drive mechanism (5) and the second drive mechanism to perform corresponding actions based on the detection results of the pressure detection module, thereby opening or closing the auxiliary air inlet (112).

10. The range hood according to claim 9, characterized in that: A fan frame (10) is provided above the smoke hood (1). A fan system (101) is provided inside the fan frame (10). The fan system (101) includes a volute (101a) with an air inlet (1011) and an air outlet (1012), an impeller (101b) provided in the volute (101a), and a third motor (101c) for driving the impeller (101b) to rotate. The smoke outlet (42) of the gas storage chamber (4) is arranged opposite to the air inlet (1011) of the volute (101a).

11. A control method for a range hood using the method described in claim 9 or 10, characterized in that... Includes the following steps: Step 1: Turn on the range hood; Step 2: Determine if the smoke baffle is fully open. If yes, proceed to Step 3; otherwise, proceed to Step 4. Step 3: Record the first time t1 = 0, and proceed to step 5; Step 4: Obtain the time required for the smoke baffle to open to the correct position, and assign this time as the first time t1; Step 5: Obtain the preset start-up delay time of the fan system after the smoke baffle is fully opened, and record this time as the second time t2; Step 6: Obtain the current pressure p1 in the gas storage chamber; Step 7: Obtain the air inlet area s1 required for the pressure in the gas storage chamber to drop from p1 to the preset pressure p2 over a time period t1+t2; Step 8: Control the baffle to open the auxiliary air inlet and make the inlet area of ​​the auxiliary air inlet equal to s1; Step 9: Determine if the time t for the user to start timing after clicking the button to turn on the range hood is greater than or equal to t1+t2. If yes, proceed to step 10; otherwise, proceed to step 2. Step 10: Turn on the fan system; Step 11: Determine if the time t from when the user clicks the button to turn on the range hood is greater than or equal to t3, where t3 is the time required from when the user clicks the button to turn on the range hood until the fan system extracts the gas from the gas storage chamber. If yes, control the baffle to close the auxiliary air inlet and end the process; otherwise, proceed to step 10.

12. The control method according to claim 11, characterized in that: Before step 1, the following steps are also included: the range hood receives a user command and determines whether the user command is a range hood start command. If so, proceed to step 1; if not, it means that the current user command is a range hood turn-off command.

13. The control method according to claim 12, characterized in that: The control logic for the range hood shutdown process includes the following steps: S1. Turn off the range hood; S2. Determine if the smoke baffle is closed completely. If yes, proceed to S3; otherwise, continue with step S2. S3, Obtain the current pressure p4 in the gas storage chamber; S4. Determine whether the pressure p4 in the current gas storage chamber is greater than or equal to p3, where p3 is the preset pressure value that the gas storage chamber needs to reach after the range hood is turned off; if yes, proceed to S8; if no, proceed to S5. S5. Determine whether the time t4 for the user to start timing after clicking the button to turn off the range hood is greater than or equal to the preset time t5. If yes, proceed to S8; otherwise, proceed to S6. S6. The fan system operates according to the preset current value, which can make the pressure in the gas storage chamber reach p3. S7. Record the shutdown duration t4 of the range hood and proceed to S3; S8. Obtain the current pressure p4 in the gas storage chamber and set p3 = p4; S9. Control the first and second sliding plates to move closer together and close the smoke outlet; S10. Shut down the fan system.

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