Range hood and control method therefor

Abstract

The present application discloses a range hood and a control method therefor. The range hood comprises a main body which is provided with an extension / retraction allowing inner cavity; an extendable / retractable panel assembly, which is slidably connected into the extension / retraction allowing inner cavity; an air curtain assembly, which is arranged in a mounting cavity of the extendable / retractable panel assembly; a negative ion generator, which is arranged on an air outlet side of the air curtain assembly; a driving module which is arranged in the extension / retraction allowing inner cavity and is connected to the extendable / retractable panel assembly and the negative ion generator; and a PM2.5 detection module which is arranged in the mounting cavity of the extendable / retractable panel assembly.

Description

Range hood and control method thereof

[0001] Related applications

[0002] This application claims priority to Chinese Patent Application No. 202410415511.3, filed on April 8, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of range hoods, in particular, to a range hood and a control method thereof. BACKGROUND

[0004] When a user performs a cooking operation, a large amount of oil fume is generated. When the range hood is started, the exhaust fan of the range hood forms a negative pressure at the air inlet, and the oil fume generated during cooking flows to the air inlet of the range hood under the action of the negative pressure, enters the air collecting box of the range hood through the air inlet of the range hood, and is then discharged by the exhaust fan, which can provide a healthy cooking environment for the user and avoid the user inhaling a large amount of oil fume during cooking. However, the user will move around during cooking, and the user will disturb the airflow when moving or stirring the food materials, causing the oil fume to escape. The escaped oil fume not only affects the health of the user, but also diffuses in the kitchen, making the air in the kitchen not fresh and clean. Over time, the oil stains will contaminate the walls of the kitchen.

[0005] SUMMARY

[0006] The present application aims to provide a range hood and a control method thereof, which solve the above technical problems.

[0007] A range hood, comprising:

[0008] A main body having a telescopic inner cavity;

[0009] A telescopic panel assembly connected slidingly in the telescopic inner cavity and having a mounting cavity;

[0010] An air curtain assembly arranged in the mounting cavity of the telescopic panel assembly;

[0011] A negative ion generator arranged in the mounting cavity of the telescopic panel assembly and located on the air outlet side of the air curtain assembly;

[0012] A driving module arranged in the telescopic inner cavity, the driving module being connected with the telescopic panel assembly and the negative ion generator;

[0013] A PM2.5 detection module arranged in the mounting cavity of the telescopic panel assembly;

[0014] The driving module can drive the telescopic panel assembly to extend into the telescopic inner cavity by a length of L1, L2 and L3, and 0L1L2L3. When the driving module drives the telescopic panel assembly to extend into the telescopic inner cavity by a length of L1 and L2, the air curtain assembly and the PM2.5 detection module extend into the telescopic inner cavity along with the telescopic panel assembly. When the driving module drives the telescopic panel assembly to extend into the telescopic inner cavity by a length of L3, the driving module simultaneously drives the emission end of the negative ion generator to extend into the mounting cavity.

[0015] According to an embodiment of the present application, the bottom of the mounting cavity is provided with an air curtain exhaust opening, the top of the mounting cavity is provided with an air curtain air inlet opening and a detection air inlet hole, the air inlet side of the air curtain assembly faces the air curtain air inlet opening, the air outlet side of the air curtain assembly faces the air curtain exhaust opening, the detection channel of the PM2.5 detection module is aligned with the detection air inlet hole, and when the driving module drives the telescopic panel assembly to extend into the telescopic inner cavity by a length of L1, the air curtain exhaust opening, the air curtain air inlet opening and the detection air inlet hole extend into the telescopic inner cavity.

[0016] According to an embodiment of the present application, when the driving module drives the telescopic panel assembly to retract into the telescopic inner cavity and the distance of the telescopic inner cavity starts to be less than L3, the driving module simultaneously drives the negative ion generator to start retracting into the mounting cavity, and when the telescopic panel assembly is retracted into the telescopic inner cavity by a length of L2, the negative ion generator is retracted into the mounting cavity.

[0017] According to an embodiment of the present application, the driving module comprises a first driving assembly and a second driving assembly. The first driving assembly is connected with the telescopic panel assembly and is used to drive the telescopic panel assembly to extend into or retract from the telescopic inner cavity. The second driving assembly is connected with the negative ion generator and is used to drive the negative ion generator to extend into the mounting cavity when the telescopic panel assembly extends into the telescopic inner cavity by a distance greater than L2, or to drive the negative ion generator to retract into the mounting cavity when the telescopic panel assembly extends into the telescopic inner cavity by a distance less than L3.

[0018] According to an embodiment of the present application, the second driving assembly comprises a sliding seat, an upper and lower sliding block, a front and rear sliding block, an upper and lower compression spring and a front and rear compression spring. The upper and lower sliding block is connected to the sliding seat in a sliding manner, and the upper and lower compression spring is arranged between the sliding seat and the upper and lower sliding block. The front and rear sliding block is connected to the sliding seat in a sliding manner, and one end of the upper and lower compression spring is connected with the front and rear sliding block, and the other end is fixedly connected to the telescopic inner cavity. The upper and lower sliding block is provided with a first inclined surface, and the first inclined surface is arranged from front to back and upward. The front and rear sliding block is provided with a second inclined surface, and the inclination of the second inclined surface is matched with the inclination of the first inclined surface and is connected with the first inclined surface in a sliding manner.

[0019] According to an embodiment of the present application, when the telescopic panel assembly is hidden in the telescopic inner cavity, the force of the front and rear compression springs on the front and rear sliders is F10, the elastic coefficient of the front and rear compression springs is K1, and the compression length is X0, so F10=K1*X0, the force of the upper and lower compression springs on the upper and lower sliders is F20, the elastic coefficient of the upper and lower compression springs is K2, and the compression length is Y0, so F20=K2*Y0, the included angle between the first inclined surface and the horizontal plane is θ, and F10*cosθ>F20*sinθ.

[0020] According to an embodiment of the present application, when the telescopic panel assembly is hidden in the telescopic inner cavity, the force of the front and rear compression springs on the front and rear sliders is F10, the elastic coefficient of the front and rear compression springs is K1, and the compression length is X0, so F10=K1*X0, the force of the upper and lower compression springs on the upper and lower sliders is F20, the elastic coefficient of the upper and lower compression springs is K2, and the compression length is Y0, so F20=K2*Y0, the included angle between the first inclined surface and the horizontal plane is θ, and F10*cosθ>F20*sinθ.

[0021] According to an embodiment of the present application, when the telescopic panel assembly is hidden in the telescopic inner cavity, the force of the front and rear compression springs on the front and rear sliders is F10, the elastic coefficient of the front and rear compression springs is K1, and the compression length is X0, so F10=K1*X0, the force of the upper and lower compression springs on the upper and lower sliders is F20, the elastic coefficient of the upper and lower compression springs is K2, and the compression length is Y0, so F20=K2*Y0, the included angle between the first inclined surface and the horizontal plane is θ, and F10*cosθ>F20*sinθ.

[0022] A control method of a range hood, suitable for the range hood described above, the control method comprising the following steps:

[0023] S1: starting the range hood, and the exhaust fan operates;

[0024] S2: the driving module drives the telescopic panel assembly to extend from the telescopic inner cavity by a length L1;

[0025] S3: the air curtain assembly starts and blows air downward;

[0026] S4: the PM2.5 detection module starts and detects the PM2.5 content C in the air in real time;

[0027] S41: if C

[0028] S42: When the extension length of the telescopic panel assembly is L1, if C>C1, the driving module increases the extension length of the telescopic panel assembly from the telescopic inner cavity from L1 to L2;

[0029] S43: When the extension length of the telescopic panel assembly is L2, if C>C1, the driving module increases the extension length of the telescopic panel assembly from the telescopic inner cavity from L2 to L3, and at the same time, the driving module drives the emission end of the negative ion generator to extend out of the installation cavity, and the negative ion generator starts to generate negative ions;

[0030] S5: Turn off the range hood and exhaust fan;

[0031] S6: The air curtain assembly is closed;

[0032] S7: PM2.5 detection module is turned off;

[0033] S8: The driving module drives the telescopic panel assembly to retract into the telescopic inner cavity;

[0034] S81: If the length of the telescopic panel assembly extending out of the telescopic inner cavity is L1 or L2, the driving module drives the telescopic panel assembly to retract into the telescopic inner cavity;

[0035] S82: If the length of the telescopic panel assembly extending out of the telescopic inner cavity is L3, the driving module drives the telescopic panel assembly to retract into the telescopic inner cavity, and drives the negative ion generator to retract into the installation cavity during the process in which the extended length of the telescopic panel assembly changes from L3 to L2.

[0036] According to one embodiment of the present application, in step S4:

[0037] S41: If C<C1, the air curtain assembly runs at power P1, P1<P max ;

[0038] S42: When the extension length of the telescopic panel assembly is L1, if C>C1, then increase the power P of the air curtain assembly. If P=P max When the PM2.5 content C still cannot drop to C<C1, the driving module will increase the length of the telescopic panel assembly extending from the telescopic inner cavity from L1 to L2;

[0039] S43: When the extension length of the telescopic panel assembly is L2 and the power P of the air curtain assembly satisfies: P = P max When C>C1, the driving module will increase the length of the telescopic panel assembly extending from the telescopic inner cavity from L2 to L3, and at the same time, the driving module drives the emission end of the negative ion generator to extend out of the installation cavity, and the negative ion generator starts and generates negative ions.

[0040] Compared with the prior art, the range hood of this application has the following effects:

[0041] The smoke machine of the present application, the driving module adjusts the distance between the wind curtain formed by the wind curtain assembly and the cooking table according to the detection result of the PM2.5 detection module by adjusting the extension length of the telescopic panel assembly, so that the escaped oil fume can be effectively blocked by the wind curtain, and when the oil fume escapes seriously, the driving module drives the negative ion generator to extend into the telescopic inner cavity, the negative ions generated by the negative ion generator diffuse downward under the action of the wind curtain, further purify the oil fume that passes through the wind curtain when escaping, and clean the air in the cooking space, providing a healthy cooking environment for the user. BRIEF DESCRIPTION OF DRAWINGS

[0042] Fig. 1 is a front view of the smoke machine of the present application;

[0043] Fig. 2 is a sectional view in the direction of A-A in Fig. 1;

[0044] Fig. 3 is a sectional view in the direction of B-B in Fig. 1;

[0045] Fig. 4 is a sectional view in the direction of C-C in Fig. 1 (the telescopic panel assembly is hidden in the telescopic inner cavity);

[0046] Fig. 5 is an enlarged view of A in Fig. 4;

[0047] Fig. 6 is a sectional view in the direction of C-C in Fig. 1 (the extension length of the telescopic panel assembly extending into the telescopic inner cavity is L1, and the emission end of the negative ion generator is hidden in the mounting cavity);

[0048] Fig. 7 is an enlarged view of B in Fig. 6;

[0049] Fig. 8 is a sectional view in the direction of C-C in Fig. 1 (the extension length of the telescopic panel assembly extending into the telescopic inner cavity is L3, and the emission end of the negative ion generator extends out of the mounting cavity);

[0050] Fig. 9 is an enlarged view of C in Fig. 8;

[0051] Fig. 10 is an exploded view of the second driving assembly of the smoke machine of the present application;

[0052] Fig. 11 is a structural schematic view of the telescopic panel assembly of the smoke machine of the present application;

[0053] Fig. 12 is a schematic view after the main body is removed from the wind collecting box and the maintenance cover plate;

[0054] Fig. 13 is an enlarged view of D in Fig. 12.

[0055] In the figure: a. telescopic inner cavity, 1. main body, 2. telescopic panel assembly, 21. air curtain exhaust port, 22. air curtain air inlet, 23. detection air inlet hole, 3. air curtain assembly, 31. air duct, 4. negative ion generator, 5. first driving assembly, 51. electric push rod, 52. rotating shaft, 53. first connecting rod, 54. second connecting rod, 55. third connecting rod, 6. second driving assembly, 61. sliding seat, 62. up-down slider, 621. first inclined surface, 63. front-rear slider, 631. second inclined surface, 64. up-down compression spring, 65. front-rear compression spring, 7. PM2.5 detection module, 8. sliding rail assembly.

[0056] The implementation and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0057] In the following, a plurality of embodiments of the present application will be disclosed with reference to the drawings. For the purpose of clear illustration, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit the present application. That is, in some embodiments of the present application, these practical details are not necessary. In addition, for the purpose of simplifying the drawings, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0058] It should be noted that all directional references, such as upper, lower, left, right, front, rear, etc., used in the description and drawings are only used for the purpose of illustration and explanation and do not constitute a limitation on the present application. If the specific posture changes, the directional references will also change accordingly.

[0059] In addition, the description such as "first", "second" and the like in the present application is only for the purpose of description and does not mean to specially indicate the order or sequence, nor to limit the present application. It is merely to distinguish the components or operations described by the same technical terms, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implying the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of ordinary skilled in the art. When the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor is it within the scope of protection claimed by the present application.

[0060] In order to further understand the content, characteristics and effects of the present application, the following embodiments are listed and described in detail as follows with reference to the accompanying drawings:

[0061] Referring to FIGS. 1-11, the application discloses a smoke machine, which comprises a main body 1, a telescopic panel assembly 2, a wind curtain assembly 3, a negative ion generator 4, a driving module and a PM2.5 detection module 7. The main body 1 has a telescopic inner cavity a. The telescopic panel assembly 2 is slidingly connected in the telescopic inner cavity a and has a mounting cavity. The bottom of the mounting cavity is provided with a wind curtain air outlet 21, and the top of the mounting cavity is provided with a wind curtain air inlet 22. The wind curtain assembly 3 is arranged in the mounting cavity of the telescopic panel assembly 2. The air inlet side of the wind curtain assembly 3 faces the wind curtain air inlet 22, and the air outlet side faces the wind curtain air outlet 21. The negative ion generator 4 is arranged in the mounting cavity of the telescopic panel assembly 2 and located at the air outlet side of the wind curtain assembly 3. The driving module is arranged in the telescopic inner cavity a and connected with the telescopic panel assembly 2 and the negative ion generator 4. The PM2.5 detection module 7 is arranged in the mounting cavity of the telescopic panel assembly 2. The detection channel of the PM2.5 detection module 7 is aligned with a detection air inlet hole 23. The driving module can drive the telescopic panel assembly 2 to extend out of the telescopic inner cavity a by a length L1, L2 and L3, and 0L1L2L3. When the driving module drives the telescopic panel assembly 2 to extend out of the telescopic inner cavity by the length L1 and L2, the wind curtain assembly 3 and the PM2.5 detection module 7 extend out of the telescopic inner cavity a with the telescopic panel assembly 2. When the driving module drives the telescopic panel assembly 2 to extend out of the telescopic inner cavity a by the length L3, the driving module simultaneously drives the emission end of the negative ion generator 4 to extend out of the mounting cavity.The range hood of the present application, when the user is cooking, the user starts the range hood, the driving module drives the telescopic panel assembly 2 to extend the length L1 of the telescopic inner cavity a, at this time the air curtain exhaust port 21, the air curtain air inlet 22 and the detection air inlet hole 23 extend out of the telescopic inner cavity a, the air curtain assembly 3 starts, the air curtain assembly 3 sucks air through the air curtain air inlet 22 and sends air downward through the air curtain exhaust port 21, forming an air curtain between the user and the stove, which can block the escape of oil smoke, and the PM2.5 detection module 7 starts and detects the content value of PM2.5 in the air in real time, if the PM2.5 detection module 7 detects that the content value of PM2.5 in the air exceeds the standard, it means that there is oil smoke escaping, the driving module will increase the length of the telescopic panel assembly 2 extending out of the telescopic inner cavity a from L1 to L2, move the air curtain to the user side, and enhance the blocking function of the air curtain to the oil smoke, if the content value of PM2.5 in the air detected by the PM2.5 detection module 7 still exceeds the standard after the length of the telescopic panel assembly 2 extending out of the telescopic inner cavity a reaches L2, the driving module will further drive the telescopic panel assembly 2 to move to the user side, so that the length of the telescopic panel assembly 2 extending out of the telescopic inner cavity a increases from L2 to L3, and the driving module drives the emission end of the negative ion generator 4 to extend out of the mounting cavity, and the emission end of the negative ion generator 4 extends out of the air curtain exhaust port 21, at this time the negative ion generator 4 starts and generates negative ions, which diffuse downward with the air curtain under the action of the air curtain, purify the oil smoke that escapes through the air curtain, reduce the amount of oil smoke that passes through the air curtain, and ensure the purification effect of the range hood.

[0062] The range hood of the present application, the extension length of the telescopic panel assembly 2 can be adjusted in sections, so that the distance between the air curtain and the user can be adjusted according to the escape of oil smoke, which can more effectively block the oil smoke; and after the extension length of the telescopic panel assembly 2 reaches L3, negative ions are generated by the negative ion generator 4 to make the air curtain wind carry negative ions, so as to purify the oil smoke flowing through the air curtain, reduce the amount of oil smoke passing through the air curtain, and further improve the purification effect of the range hood.

[0063] The range hood of the present application, the driving module has two driving modes, when the driving module drives the telescopic panel assembly 2 to extend the length L1 / L2 of the telescopic inner cavity a or retract into the telescopic inner cavity a from the length L1 / L2 extending out of the telescopic inner cavity a, the driving module adopts the first driving mode of driving the telescopic panel assembly 2 to extend or retract into the telescopic inner cavity a alone, when the driving module increases the length of the telescopic panel assembly 2 extending out of the telescopic inner cavity a from L2 to L3 or reduces the length from L3 to L2, the driving module adopts the second driving mode of driving the telescopic panel assembly 2 to extend or retract into the telescopic inner cavity a while driving the emission end of the negative ion generator 4 to extend or retract into the mounting cavity through the air curtain exhaust port 21.

[0064] The smoke machine of the present application, when the driving module drives the telescopic panel assembly 2 to retract into the telescopic inner cavity a and the distance of the telescopic panel assembly 2 extending out of the telescopic inner cavity a is less than L3, the driving module simultaneously drives the negative ion generator 4 to start retracting into the mounting cavity, and when the telescopic panel assembly 2 is retracted to the distance of L2 extending out of the telescopic inner cavity a, the negative ion generator 4 is retracted to the position in the mounting cavity. When the distance of the telescopic panel assembly 2 extending out of the telescopic inner cavity a is L3, if the smoke machine is turned off, the telescopic panel assembly 2 starts to retract into the telescopic inner cavity a from the extended state, at this time the distance of the telescopic panel assembly 2 extending out of the telescopic inner cavity a is less than L3, the driving module first uses the second driving mode to make the telescopic panel assembly 2 partially retract into the telescopic inner cavity a, and simultaneously makes the negative ion generator 4 retract upward into the mounting cavity of the telescopic panel assembly 2, after the distance of the telescopic panel assembly 2 extending out of the telescopic inner cavity a becomes L2, the negative ion generator 4 is fully retracted into the mounting cavity, and then the driving module uses the first driving mode to separately drive the telescopic panel assembly 2 to remain partially retract into the telescopic inner cavity a.

[0065] The driving module of the range hood of the application comprises a first driving assembly 5 and a second driving assembly 6. The first driving assembly 5 is connected with the telescopic panel assembly 2 and is used to drive the telescopic panel assembly 2 to extend or retract into the telescopic inner cavity a. The second driving assembly 6 is connected with the negative ion generator 4 and is used to drive the negative ion generator 4 to extend out of the mounting cavity when the distance of the telescopic panel assembly 2 extending out of the telescopic inner cavity a starts to be greater than L2, or to drive the negative ion generator 4 to retract into the mounting cavity when the distance of the telescopic panel assembly 2 extending out of the telescopic inner cavity a starts to be less than L3. When the telescopic panel assembly 2 is located in the telescopic inner cavity a and the range hood is started, the driving module is started, the first driving assembly 5 drives the telescopic panel assembly 2 to start extending out of the telescopic inner cavity a by L1, at this time, the negative ion generator 4 only moves horizontally with the telescopic panel assembly 2. When the PM2.5 detection module 7 detects that the content of PM2.5 in the air exceeds the standard, the first driving assembly 5 drives the telescopic panel assembly 2 to continue extending out of the telescopic inner cavity a and increases the length of the telescopic panel assembly 2 to L2. If the content of PM2.5 in the air still exceeds the standard after the length of the telescopic panel assembly 2 extending out of the telescopic inner cavity a reaches L2, the first driving assembly 5 increases the length of the telescopic panel assembly 2 extending out of the telescopic inner cavity a to L3. In the process of the first driving assembly 5 driving the telescopic panel assembly 2 to extend out of the telescopic inner cavity a from L2 to L3, the second driving assembly 6 starts to move the negative ion generator 4 downward relative to the mounting cavity, and the emitting end of the negative ion generator 4 starts to extend out of the lower surface of the telescopic panel assembly 2. When the telescopic panel assembly 2 extends out by L3, the emitting end of the negative ion generator 4 is lowered into position. When the range hood is turned off, the driving module is started, the first driving assembly 5 drives the telescopic panel assembly 2 to start moving into the telescopic inner cavity a, and at the same time, the second driving assembly 6 starts to retract the emitting end of the negative ion generator 4 into the mounting cavity. When the length of the telescopic panel assembly 2 extending out of the telescopic inner cavity a changes from L3 to L2, the emitting end of the negative ion generator 4 is completely retracted above the lower surface of the telescopic panel assembly 2, the negative ion generator 4 is retracted into position in the mounting cavity, and the first driving assembly 5 continues to drive the telescopic panel assembly 2 to move into the telescopic inner cavity a until the telescopic panel assembly 2 is retracted into position in the telescopic inner cavity a.

[0066] The first driving assembly 5 of the range hood of the application can adopt an electric push rod which directly pushes the telescopic panel assembly 2 to move back and forth in the telescopic inner cavity a.

[0067] Please refer to FIG. 2, FIG. 12 and FIG. 13, in the embodiment, the first driving assembly 5 comprises an electric push rod 51, a rotating shaft 52, a first connecting rod 53, a second connecting rod 54 and a third connecting rod 55, the driving end of the electric push rod 51 is connected to one end of the first connecting rod 53, the other end of the first connecting rod 53 is connected to the rotating shaft 52, the rotating shaft 52 is rotatably connected in the telescopic inner cavity a through a shaft seat, the electric push rod 51 drives the rotating shaft 52 to rotate through the first connecting rod 53, both ends of the rotating shaft 52 are connected with the second connecting rod 54, one end of the third connecting rod 55 is rotatably connected with the second connecting rod 54, the telescopic inner cavity a is provided with the slide rail assembly 8, the fixed rail of the slide rail assembly 8 is fixed on the side wall of the telescopic inner cavity a, the movable rail is slidably connected with the fixed rail, the movable rail is connected with the telescopic panel assembly 2, the other end of the third connecting rod 55 is connected with the movable rail of the slide rail assembly or the telescopic panel assembly 2, when the electric push rod 51 is started, the electric push rod 51 pushes the first connecting rod 53 to swing, the first connecting rod 53 drives the rotating shaft 52 to rotate, the rotating shaft 52 drives the second connecting rod 54 to rotate, the second connecting rod 54 drives the third connecting rod 55 to rotate, due to the limiting of the fixed rail, the third connecting rod 55 pushes the movable rail to slide along the fixed rail, or the telescopic panel assembly 2 pushes the movable rail to slide along the fixed rail, so as to make the telescopic panel assembly 2 slide in the telescopic inner cavity a.

[0068] The smoke machine of the application, the second driving assembly 6 comprises a sliding seat 61, upper and lower sliding blocks 62, front and rear sliding blocks 63, upper and lower compression springs 64 and front and rear compression springs 65, the upper and lower sliding blocks 62 are connected to the sliding seat 61 in sliding mode, the upper and lower compression springs 64 are arranged between the two, the front and rear sliding blocks 63 are connected to the sliding seat 61 in sliding mode, one end of the upper and lower compression springs 64 is connected to the front and rear sliding blocks 63, and the other end is fixedly connected to the telescopic inner cavity a, the upper and lower sliding blocks 62 are provided with a first inclined surface 621, the first inclined surface 621 is arranged in an upward inclination from front to back, the front and rear sliding blocks 63 are provided with a second inclined surface 631, the inclination of the second inclined surface 631 is matched with the inclination of the first inclined surface 621 and is connected to the first inclined surface 621 in sliding mode. When the negative ion generator 4 is located in the telescopic inner cavity a, the front and rear compression springs 65 are in a compressed state, the front and rear compression springs 65 exert a forward thrust on the front and rear sliding blocks 63, because the second inclined surface 631 of the front and rear sliding blocks 63 is arranged in a downward inclination from front to back and abuts against the first inclined surface 621, the front and rear sliding blocks 63 exert an upward force on the upper and lower sliding blocks 62, so that the upper and lower compression springs 64 are in a compressed state, at this time, the emitting end of the negative ion generator 4 is hidden in the mounting cavity of the telescopic panel assembly 2; when the telescopic panel assembly 2 moves out of the telescopic inner cavity a, because the other end of the front and rear compression springs 65 is fixed in the telescopic inner cavity a, the compression length of the front and rear compression springs 65 becomes smaller, the acting force of the front and rear compression springs 65 on the front and rear sliding blocks 63 becomes smaller, and the acting force of the front and rear sliding blocks 63 on the upper and lower sliding blocks 62 becomes smaller, but at this time, the elastic force of the upper and lower compression springs 64 is still insufficient to overcome the frictional force of the front and rear sliding blocks 63 on the upper and lower sliding blocks 62 along the first inclined surface 621, the compression length of the upper and lower compression springs 64 does not change, and the emitting end of the negative ion generator 4 is still hidden in the mounting cavity of the telescopic panel assembly 2, so that the negative ion generator 4 can be smoothly moved out of the telescopic inner cavity a together with the telescopic panel assembly 2, the greater the length of the telescopic panel assembly 2 moved out of the telescopic inner cavity a, the smaller the compression length of the front and rear compression springs 65, and the smaller the acting force of the front and rear compression springs 65 on the front and rear sliding blocks 63, after the length of the telescopic panel assembly 2 extending out of the telescopic inner cavity is greater than L2, after the elastic force of the upper and lower compression springs 64 is sufficient to overcome the frictional force of the front and rear sliding blocks 63 on the upper and lower sliding blocks 62 along the first inclined surface 621, the upper and lower compression springs 64 start to drive the upper and lower sliding blocks 62 to descend, the force of the upper and lower sliding blocks 62 acting on the second inclined surface 631 through the first inclined surface 621 is decomposed into a horizontal component force, which makes the front and rear sliding blocks 63 move backward along the sliding seat 61, and the upper and lower sliding blocks 62 descend and drive the negative ion generator 4 to extend out of the mounting cavity of the telescopic panel assembly 2 to the lower surface of the telescopic panel assembly 2.Likewise, when the telescopic panel assembly 2 needs to retract into the telescopic inner cavity a, the telescopic panel assembly 2 moves into the telescopic inner cavity a with the negative ion generator 4, the front and rear slider 63 moves backward relative to the telescopic inner cavity a, the front and rear slider 63 starts to press the front and rear compression spring 65 backward, the compression of the front and rear compression spring 65 exerts a force in the opposite direction on the front and rear slider 63, when the horizontal force of the front and rear compression spring 65 on the front and rear slider 63 overcomes the horizontal component of the force of the upper and lower compression spring 64 on the front and rear slider 63 through the upper and lower slider 62, the front and rear slider 63 starts to move forward along the slide 61 relative to the upper and lower slider 62, the second inclined surface 631 of the front and rear slider 63 acts on the first inclined surface 621 of the upper and lower slider 62, presses the first inclined surface 621 and moves the upper and lower slider 62 upward and compresses the upper and lower compression spring 64, the upper and lower slider 62 moves upward and drives the negative ion generator 4 to retract into the mounting cavity of the telescopic panel assembly 2; then the first drive assembly 5 continues to drive the telescopic panel assembly 2 to move into the telescopic inner cavity a until the telescopic panel assembly 2 is in place.

[0069] When the telescopic panel assembly 2 is hidden in the telescopic inner cavity a, the force of the front and rear compression spring 65 on the front and rear slider 63 is F10, the elastic coefficient of the front and rear compression spring 65 is K1, and the compression length is X0, then F10=K1*X0, the force of the upper and lower compression spring 64 on the upper and lower slider 62 is F20, the elastic coefficient of the upper and lower compression spring 64 is K2, and the compression length is Y0, then F20=K2*Y0, the angle between the first inclined surface 621 and the horizontal plane is θ, then: F10*cosθ>F20*sinθ. The force F10 of the front and rear compression spring 65 acting on the front and rear slider 63 is forward along the horizontal direction, after acting on the first inclined surface 621 through the second inclined surface 631, it can be decomposed into a first component F1 10 along the first inclined surface 621 downward and a second component F1 20 perpendicular to the first inclined surface 621 upward, and the relationship between the first component F1 10 and the force F10 of the front and rear compression spring 65 on the front and rear slider 63 is: F1 10 =F10*cosθ, the force F20 of the upper and lower compression spring 64 acting on the first inclined surface 621 is downward vertically, after acting on the second inclined surface 631 through the first inclined surface 621, it can be decomposed into a first component F2 10 along the first inclined surface 621 downward and a second component F2 20 perpendicular to the first inclined surface 621 downward, and the relationship between the first component F2 10 and the force F20 of the upper and lower compression spring 64 on the upper and lower slider 62 is: F2 10=F20*sinθ; so, when the retractable panel assembly 2 is hidden in the retractable inner cavity a, F10*cosθ>F20*sinθ, which means that the force of the front and back slider 63 acting on the first inclined surface 621 along the first inclined surface 621 upward is greater than the force of the up and down spring 64 acting on the first inclined surface 621 along the first inclined surface downward, so the up and down slider 62 cannot slide downward relative to the second inclined surface 631 under the action of the up and down spring 64, and the emitting end of the negative ion generator 4 remains hidden in the mounting cavity of the retractable panel assembly 2.

[0070] When the retractable panel assembly 2 is hidden in the retractable inner cavity a, the force of the front and back spring 65 acting on the front and back slider 63 is F11, the elastic coefficient of the front and back spring 65 is K1, the compression length is X1=X0-L2, so F11=K1*X1, the force of the up and down spring 64 acting on the up and down slider 62 is F20, the elastic coefficient of the up and down spring 64 is K2, the compression length is Y0, so F20=K2*Y0, the angle between the first inclined surface 621 and the horizontal plane is θ, so: F11*cosθ=F20*sinθ. When the retractable panel assembly 2 starts to move out of the retractable inner cavity a, the compression length of the front and back spring 65 starts to decrease, the greater the length of the retractable panel assembly 2 moving out of the retractable inner cavity a, the smaller the compression length of the front and back spring 65, and the smaller the force acting on the front and back slider 63. After the negative ion generator 4 moves out of the retractable inner cavity with the retractable panel assembly 2, there must be a time when the elastic force of the up and down spring 64 is sufficient to overcome the frictional force of the front and back slider 63 on the up and down slider 62 along the first inclined surface 621, that is: F11*cosθ=F20*sinθ. After this moment, when the retractable panel assembly 2 continues to move out of the retractable inner cavity a, the up and down spring 64 starts to drive the up and down slider 62 to descend, and the negative ion generator 4 starts to move out of the mounting cavity of the retractable panel assembly 2. In this embodiment, when the length of the retractable panel assembly 2 moving out of the retractable inner cavity a is L2, F11*cosθ=F20*sinθ, and the up and down spring 64 starts to play a leading role when the retractable panel assembly 2 continues to move out of the retractable inner cavity a, the elastic force of the up and down spring 64 overcomes the frictional force of the front and back slider 63 on the up and down slider 62 along the first inclined surface 621 and makes the up and down slider 62 start to slide downward along the second inclined surface 631. As the length of the retractable panel assembly 2 moving out of the retractable inner cavity a increases, the distance of the negative ion generator 4 moving downward driven by the up and down slider 62 increases. When the length of the retractable panel assembly 2 moving out of the retractable inner cavity a is L3, the negative ion generator 4 moves out of the mounting cavity to the position.

[0071] The smoke machine of the application, when the telescopic panel assembly 2 extends out of the telescopic inner cavity a by a length L3, the emitting end of the negative ion generator 4 extends out below the telescopic panel assembly 2 by a distance h, the head diameter of the emitting end of the negative ion generator 4 is D, h>D, 2mm≤D≤5mm, the compression length Y2 of the upper and lower sliders 62 satisfies Y2≥h, at this time the force of the front and rear compression springs 65 on the front and rear sliders 63 is F12, the elastic coefficient of the front and rear compression springs 65 is K1, the compression length is X2= / X0-L3 / , then F12=K1*X2, the force of the upper and lower compression springs 64 on the upper and lower sliders 62 is F22, the elastic coefficient of the upper and lower compression springs 64 is K2, the compression length is Y2, then F22=K2*Y2, the angle between the first inclined surface 621 and the horizontal plane is θ, then: F12*cosθ<F22*sinθ. When the telescopic panel assembly 2 extends out of the telescopic inner cavity a by a length L2, the elastic force of the upper and lower compression springs 64 is sufficient to overcome the frictional force of the front and rear sliders 63 on the upper and lower sliders 62 along the first inclined surface 621, that is: F11*cosθ=F20*sinθ, in this state, when the telescopic panel assembly 2 continues to move out of the telescopic inner cavity a, the upper and lower compression springs 64 begin to drive the upper and lower sliders 62 to descend, and the negative ion generator 4 begins to extend out of the mounting cavity of the telescopic panel assembly 2, in this process F12*cosθ<F22*sinθ. After the negative ion generator 4 is lowered in place, the lowering height h satisfies h>D, that is, the emitting end of the negative ion generator 4 can be completely exposed from the mounting cavity of the telescopic panel assembly 2, so that the negative ions generated by the negative ion generator 4 can be diffused with the wind curtain wind blown by the wind curtain assembly 3, avoiding the negative ions entering the mounting cavity of the telescopic panel assembly 2 from contacting the inner cavity of the telescopic panel assembly 2 and being annihilated, thereby improving the utilization rate of negative ions. The compression length Y2 of the upper and lower sliders 62 satisfies Y2≥h, that is, if the emitting end of the negative ion generator 4 is higher than the lower surface of the telescopic panel assembly 2 when the negative ion generator 4 is hidden in the mounting cavity of the telescopic panel assembly 2, the compression length Y2 of the upper and lower sliders 62 satisfies Y2>h when the negative ion generator 4 extends out of the mounting cavity of the telescopic panel assembly 2, so that the negative ion generator 4 can be lowered by a height h from the mounting cavity of the telescopic panel assembly 2; if the emitting end of the negative ion generator 4 is flush with the lower surface of the telescopic panel assembly 2 when the negative ion generator 4 is hidden in the mounting cavity of the telescopic panel assembly 2, the compression length Y2 of the upper and lower sliders 62 satisfies Y2=h when the negative ion generator 4 extends out of the mounting cavity of the telescopic panel assembly 2, so that the negative ion generator 4 can be lowered by a height h from the mounting cavity of the telescopic panel assembly 2.

[0072] The smoke machine of the present application, the air curtain assembly 3 comprises a wind channel 31, the air inlet side of the wind channel 31 corresponds to the air curtain air inlet 22, the air outlet side of the wind channel 31 corresponds to the air curtain air outlet 21, the negative ion generator 4 is arranged in the wind channel, the emission end thereof passes through the air outlet side of the wind channel 31 and can rise or fall through the air curtain air outlet 21. When the smoke machine is started and the telescopic panel assembly 2 is extended from the telescopic inner cavity a, the fan of the air curtain assembly 3 sucks the air from above the telescopic panel assembly 2 into the wind channel 31 through the air curtain air inlet 22, and then the air in the wind channel 31 is discharged downward through the air curtain air outlet 21 and forms an air curtain. When the air curtain blows downward, the negative ions generated by the negative ion generator 4 can be blown farther, so that the negative ions can purify the oil fume in the air curtain.

[0073] The present application also provides a control method of the smoke machine. The control method of the smoke machine provided by the present application is suitable for the smoke machine described above, and comprises the following steps:

[0074] S1: starting the smoke machine, and operating the smoke exhaust fan;

[0075] S2: driving the telescopic panel assembly 2 to extend from the telescopic inner cavity a by a length L1 by the driving module;

[0076] S3: starting the air curtain assembly 3 and discharging air downward;

[0077] S4: starting the PM2.5 detection module 7 and detecting the PM2.5 content C in the air in real time;

[0078] S41: if C

[0079] S42: if C

[0080] S43: if C

[0081] S5: closing the smoke machine, and closing the smoke exhaust fan;

[0082] S6: closing the air curtain assembly 3;

[0083] S7: closing the PM2.5 detection module 7;

[0084] S8: driving the telescopic panel assembly 2 to retract into the telescopic inner cavity a by the driving module;

[0085] S81: If the length of the telescopic panel assembly 2 extending out of the telescopic inner cavity a is L1 or L2, the driving module drives the telescopic panel assembly 2 to retract into the telescopic inner cavity a;

[0086] S82: If the length of the telescopic panel assembly 2 extending out of the telescopic inner cavity a is L3, the driving module drives the telescopic panel assembly 2 to retract into the telescopic inner cavity a, and drives the negative ion generator 4 to retract into the mounting cavity during the process that the length of the telescopic panel assembly 2 extending out changes from L3 to L2.

[0087] The control method of the range hood of the present application, after the range hood is turned on, the main control system of the range hood first drives the first driving assembly 5 to drive the telescopic panel assembly 2 to extend out of the telescopic inner cavity a by a length L1, so that the air curtain exhaust opening 21, the air curtain air inlet opening 22 and the detection air inlet hole 23 extend out of the telescopic inner cavity a, then the air curtain assembly 3 operates, the air curtain assembly 3 sucks air through the air curtain air inlet opening 22 and sends air through the air curtain exhaust opening 21, forming an air curtain between the user and the stove, at the same time, the PM2.5 detection module 7 starts and detects the PM2.5 content in the air in real time. During the cooking process of the user, if the PM2.5 content C detected by the PM2.5 detection module 7 satisfies C < C1, the length of the telescopic panel assembly 2 extending out remains unchanged, if the PM2.5 content C detected by the PM2.5 detection module 7 satisfies C > C1, the first driving assembly 5 will increase the length of the telescopic panel assembly 2 extending out of the telescopic inner cavity a from L1 to L2, at this time, the air curtain moves towards the user side, and the blocking effect on the oil fume is improved. In the case that the length of the telescopic panel assembly 2 extending out of the telescopic inner cavity a is L2, if the PM2.5 content in the air reduces to C < C1, the length of the telescopic panel assembly 2 extending out remains unchanged at L2, if the PM2.5 content C detected by the PM2.5 detection module 7 still exceeds the standard, the first driving assembly 5 will increase the length of the telescopic panel assembly 2 extending out of the telescopic inner cavity a from L2 to L3, so that the air curtain moves further towards the user side. During the process that the length of the telescopic panel assembly 2 extending out of the telescopic inner cavity a changes from L2 to L3, the second driving assembly 6 drives the negative ion generator 4 to move out of the mounting cavity, when the length of the telescopic panel assembly 2 extending out of the telescopic inner cavity a reaches L3, the negative ion generator 4 extends out of the air curtain exhaust opening 21 and extends to the position, the negative ion generator 4 starts and generates negative ions, the negative ions diffuse downwards along with the air curtain, and the escaped oil fume will be purified by the negative ions in the air curtain. In the case that the length of the telescopic panel assembly 2 extending out of the telescopic inner cavity a is L3, if the PM2.5 content in the air reduces to C < C1, the length of the telescopic panel assembly 2 extending out remains unchanged at L3, if the PM2.5 content C detected by the PM2.5 detection module 7 still exceeds the standard, the exhaust fan of the range hood will operate at a higher power.

[0088] In step S4 of the control method of the range hood of the present application:

[0089] S41: If C < C1, the air curtain assembly 3 is operated at power P1, P1 < P max ;

[0090] S42: When the extension length of the telescopic panel assembly 2 is L1, if C > C1, the power P of the air curtain assembly 3 is increased, if P = P max 1, the PM2.5 content C still cannot be reduced to C < C1, the driving module will increase the extension length of the telescopic panel assembly 2 from L1 to L2 in the telescopic inner cavity a;

[0091] S43: When the extension length of the telescopic panel assembly 2 is L2, and the power P of the air curtain assembly 3 satisfies: P = P max 1, if C > C1, the driving module will increase the extension length of the telescopic panel assembly 2 from L2 to L3, and the driving module drives the emission end of the negative ion generator 4 to extend from the mounting cavity, and the negative ion generator 4 is started and generates negative ions.

[0092] The control method of the range hood of the present application, the PM2.5 detection module 7 detects that the PM2.5 content C exceeds the standard, the main control system of the range hood first increases the power of the air curtain assembly 3, if the power of the air curtain assembly 3 is increased to P max 1, the PM2.5 content C in the air still cannot be reduced to C < C1, the first driving assembly 5 adjusts the extension length of the telescopic panel assembly 2, the power of the air curtain assembly 3 is increased to P max 1, and the extension length of the telescopic panel assembly 2 is maximum, the main control system of the range hood starts the negative ion generator 4 at the same time, the negative ion generator 4 generates negative ions, the negative ions diffuse downward along with the air curtain, and the escaped cooking fume will be purified by the negative ions in the air curtain. If the PM2.5 detection module 7 detects that the PM2.5 content C still exceeds the standard under the condition that the negative ion generator 4 is started, the exhaust fan of the range hood will increase the power and operate.

[0093] The above is only an optional embodiment of the present application, and does not limit the present application. Any modification, equivalent replacement or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A range hood, wherein: The range hood comprises: A main body (1), wherein the main body (1) has a telescopic inner cavity (a); A telescopic panel assembly (2), the telescopic panel assembly (2) being slidably connected in the telescopic inner cavity (a), the telescopic panel assembly (2) having a mounting cavity; An air curtain assembly (3), the air curtain assembly (3) being arranged in the installation cavity of the telescopic panel assembly (2); A negative ion generator (4), the negative ion generator (4) being arranged in the installation cavity of the telescopic panel assembly (2) and located on the air outlet side of the air curtain assembly (3); A driving module, the driving module being arranged in the telescopic inner cavity (a), the driving module being connected to the telescopic panel assembly (2) and the negative ion generator (4); A PM2.5 detection module (7), the PM2.5 detection module (7) being arranged in the installation cavity of the telescopic panel assembly (2); The driving module can drive the telescopic panel assembly (2) to extend out of the telescopic inner cavity (a) to a length of L1, L2, and L3, 0<L1<L2<L3; when the driving module drives the telescopic panel assembly (2) to extend out of the telescopic inner cavity (a) to a length of L1 and L2, the air curtain assembly (3) and the PM2.5 detection module (7) extend out of the telescopic inner cavity (a) along with the telescopic panel assembly (2); when the driving module drives the telescopic panel assembly (2) to extend out of the telescopic inner cavity (a) to a length of L3, the driving module simultaneously drives the emission end of the negative ion generator (4) to extend out of the installation cavity.

2. The range hood according to claim 1, wherein: The bottom of the installation cavity is provided with an air curtain exhaust port (21), the top of the installation cavity is provided with an air curtain inlet port (22) and a detection air inlet port (23), the air inlet side of the air curtain assembly (3) faces the air curtain inlet port (22), and the air outlet side faces the air curtain exhaust port (21), the detection channel of the PM2.5 detection module (7) is aligned with the detection air inlet port (23), and when the driving module drives the telescopic panel assembly (2) to extend out of the telescopic inner cavity (a) to a length of L1, the air curtain exhaust port (21), the air curtain inlet port (22) and the detection air inlet port (23) extend out of the telescopic inner cavity (a).

3. The range hood according to claim 1, wherein: When the driving module drives the telescopic panel assembly (2) to retract into the telescopic inner cavity (a) and the distance of the telescopic inner cavity (a) begins to be less than L3, the driving module simultaneously drives the negative ion generator (4) to begin to retract into the installation cavity, and when the telescopic panel assembly (2) retracts to a distance L2 extending out of the telescopic inner cavity (a), the negative ion generator (4) retracts into the installation cavity.

4. The range hood according to claim 1, wherein: The driving module comprises a first driving component (5) and a second driving component (6), wherein the first driving component (5) is connected to the telescopic panel component (2) and is used to drive the telescopic panel component (2) to extend or retract into the telescopic inner cavity (a), and the second driving component (6) is connected to the negative ion generator (4) and is used to drive the negative ion generator (4) to extend out of the installation cavity when the distance that the telescopic panel component (2) extends out of the telescopic inner cavity (a) begins to be greater than L2, or to drive the negative ion generator (4) to retract into the installation cavity when the distance that the telescopic panel component (2) extends out of the telescopic inner cavity (a) begins to be less than L3.

5. The range hood according to claim 4, wherein: The second driving assembly (6) includes a slide (61), upper and lower sliders (62), front and rear sliders (63), upper and lower compression springs (64) and front and rear compression springs (65), the upper and lower sliders (62) are connected to the slide (61) in an up and down sliding manner, the upper and lower compression springs (64) are pressed between the two, the front and rear sliders (63) are connected to the slide (61) in an up and down sliding manner, one end of the upper and lower compression springs (64) is connected to the front and rear sliders (63), and the other end is fixedly connected to the telescopic inner cavity (a), the upper and lower sliders (62) are provided with a first inclined surface (621), the first inclined surface (621) is inclined upward from front to rear, the front and rear sliders (63) are provided with a second inclined surface (631), the inclination of the second inclined surface (631) is adapted to the inclination of the first inclined surface (621) and is slidably connected to the first inclined surface (621).

6. The range hood according to claim 5, wherein: When the telescopic panel assembly (2) is hidden in the telescopic inner cavity (a), the force of the front and rear compression springs (65) on the front and rear sliders (63) is F10, the elastic coefficient of the front and rear compression springs (65) is K1, the compression length is X0, then F10=K1*X0, the force of the upper and lower compression springs (64) on the upper and lower sliders (62) is F20, the elastic coefficient of the upper and lower compression springs (64) is K2, the compression length is Y0, then F20=K2*Y0, the angle between the first inclined plane (621) and the horizontal plane is θ, then: F10cosθ>F20*sinθ.

7. The range hood according to claim 5, wherein: When the telescopic panel assembly (2) extends from the hidden state to the length of the telescopic inner cavity (a) is L2, the force of the front and rear compression springs (65) on the front and rear sliders (63) is F11, the elastic coefficient of the front and rear compression springs (65) is K1, the compression length is X1=X0-L2, then F11=K1*X1, the force of the upper and lower compression springs (64) on the upper and lower sliders (62) is F20, the elastic coefficient of the upper and lower compression springs (64) is K2, the compression length is Y0, then F20=K2*Y0, the angle between the first inclined plane (621) and the horizontal plane is θ, then: F11*cosθ=F20*sinθ.

8. The range hood according to claim 5, wherein: When the length of the telescopic panel assembly (2) extending out of the telescopic inner cavity (a) is L3, the distance between the emitting end of the negative ion generator (4) and the bottom of the telescopic panel assembly (2) is h, the head diameter of the emitting end of the negative ion generator (4) is D, h>D, 2㎜≤D≤5㎜, the compression length Y2 of the upper and lower sliders (62) satisfies Y2≥h, and at this time, the force of the front and rear compression springs (65) on the front and rear sliders (63) is F 12, the elastic coefficient of the front and rear compression springs (65) is K1, the compression length is X2 = / X0-L3 / , then F12 = K1*X2, the force of the upper and lower compression springs (64) on the upper and lower sliders (62) is F22, the elastic coefficient of the upper and lower compression springs (64) is K2, the compression length is Y2, then F22 = K2*Y2, the angle between the first inclined plane (621) and the horizontal plane is θ, then: F12*cosθ<F22*sinθ.

9. A range hood control method, applicable to the range hood according to any one of claims 1 to 8, wherein: The control method comprises the following steps: S1: Start the smoke exhaust fan and run the smoke exhaust fan; S2: a driving module drives the telescopic panel assembly (2) to extend from the telescopic inner cavity (a) by a length L1; S3: The air curtain assembly (3) starts and exhausts air downwards; S4: The PM2.5 detection module (7) starts and detects the PM2.5 content C in the air in real time; S41: If C<C1, the telescopic panel assembly (2) is kept at an extended length L1; S42: When the extension length of the telescopic panel assembly (2) is L1, if C>C1, the driving module increases the extension length of the telescopic panel assembly (2) from the telescopic inner cavity (a) from L1 to L2; S43: When the extension length of the telescopic panel assembly (2) is L2, if C>C1, the driving module increases the extension length of the telescopic panel assembly (2) from the telescopic inner cavity (a) from L2 to L3, and at the same time, the driving module drives the emission end of the negative ion generator (4) to extend out of the installation cavity, and the negative ion generator (4) is started and generates negative ions; S5: Turn off the range hood and exhaust fan; S6: The air curtain assembly (3) is closed; S7: PM2.5 detection module (7) is turned off; S8: the driving module drives the telescopic panel assembly (2) to retract into the telescopic inner cavity (a); S81: If the length of the telescopic panel assembly (2) extending out of the telescopic inner cavity (a) is L1 or L2, the driving module drives the telescopic panel assembly (2) to retract into the telescopic inner cavity (a); S82: If the length of the telescopic panel assembly (2) extending out of the telescopic inner cavity (a) is L3, the driving module drives the telescopic panel assembly (2) to retract into the telescopic inner cavity (a), and drives the negative ion generator (4) to retract into the installation cavity during the process of the telescopic panel assembly (2) extending from L3 to L2.

10. The control method of the range hood according to claim 9, wherein: In step S4: S41: If C<C1, the air curtain assembly (3) operates at power P1, P1<P max ; S42: When the extension length of the telescopic panel assembly (2) is L1, if C>C1, then increase the power P of the air curtain assembly (3). If P=P max When the PM2.5 content C still cannot drop to C<C1, the driving module will increase the length of the telescopic panel assembly (2) extending from the telescopic inner cavity (a) from L1 to L2; S43: When the extension length of the telescopic panel assembly (2) is L2 and the power P of the air curtain assembly (3) satisfies: P=P max When C>C1, the driving module increases the length of the telescopic panel assembly (2) extending from the telescopic inner cavity (a) from L2 to L3, and at the same time, the driving module drives the emission end of the negative ion generator (4) to extend out of the installation cavity, and the negative ion generator (4) starts and generates negative ions.

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