Range hood and control method thereof

Abstract

The invention provides a range hood and a control method thereof. The range hood comprises a main air duct and at least one extensible air suction opening structure. The extensible air suction opening structure comprises a telescopic air duct, a telescopic air duct top cover, a lantern ring and a supporting frame. The extensible exhaust inlet structure is arranged on the side surface of the range hood; the telescopic air duct is connected with the slope of the main air duct; the support frame is connected with one side of the telescopic air duct; one side of the telescopic air duct top cover is connected with the supporting frame; the other side of the telescopic air duct top cover is connected with the other side of the telescopic air duct; the lantern ring is arranged in an interlayer between the main air duct and the telescopic air duct; the telescopic air duct top cover coincides with the telescopic air duct in the folded state, the telescopic air duct top cover is turned upwards in the unfolded state, and the telescopic air duct top cover and the telescopic air duct form a suction port. According to the extensible air suction opening structure, the width of the smoke suction opening of the range hood is increased in the unfolded state, and a wider air suction range is provided. And the telescopic air duct is overlapped in a folded state, so that the appearance of the range hood is not influenced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of kitchen appliances, and in particular to a range hood and a control method thereof. Background Art

[0002] The current range hoods on the market are mainly designed to meet the needs of dual stoves. However, with the popularity of small kitchen appliances, the use of portable small appliances such as induction cookers and electric steamers is also increasing. The existing dual stove range hoods cannot collect the steam and fumes generated by these small appliances very well. Figure 1 and Figure 2 As shown. Figure 1 As shown in the figure, the positional relationship between the range hood and the stove is as follows: the stove 102 is located below the front air intake of the range hood 101, and the two stoves 102 almost occupy the entire air intake. Figure 2 As shown in the figure, the working principle of the range hood is as follows: the air flows under the action of the fan, a relatively fast airflow and negative pressure are generated at the air inlet, and the air flows above the stove, such as Figure 2 As shown by the arrow, oil smoke or steam enters the range hood through the air intake port along with the air flow and is discharged under the action of the fan. The size of the air intake port determines the size and range of the air flow above the stove. The farther away from the air intake port, the slower the air flow speed, and the less likely oil smoke and steam are to be inhaled. Summary of the invention

[0003] The technical problem to be solved by the present disclosure is to overcome the defect in the prior art that the oil smoke outside the suction port of the range hood cannot be well collected, and to provide a range hood and a control method thereof.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] The present disclosure provides a range hood, the range hood comprising a main air duct and at least one expandable air suction port structure; the expandable air suction port structure comprises a telescopic air duct, a telescopic air duct top cover, a collar and a support frame;

[0006] The expandable air suction port structure is arranged on the side of the range hood; the telescopic air duct is connected to the inclined surface of the main air duct; the support frame is connected to one side of the telescopic air duct; one side of the telescopic air duct top cover is connected to the support frame; the other side of the telescopic air duct top cover is connected to the other side of the telescopic air duct; the collar is arranged in the interlayer between the main air duct and the telescopic air duct; the telescopic air duct top cover overlaps with the telescopic air duct in the retracted state, and the telescopic air duct top cover flips up in the unfolded state, and the telescopic air duct top cover and the telescopic air duct form a suction port;

[0007] The support frame is used to maintain the retractable air duct top cover and the retractable air duct in a retracted state or an unfolded state; the sleeve ring is used to guide the unfolding movement of the retractable air duct.

[0008] Preferably, the range hood further comprises a bayonet;

[0009] The bayonet is connected to the telescopic air duct;

[0010] The closed state and the open state of the bayonet are switched by pressing;

[0011] When the bayonet is in an open state, the telescopic air duct is in an expanded state.

[0012] Preferably, the expandable air suction port structure further includes a motion mechanism;

[0013] The movement mechanism is connected to the telescopic air duct;

[0014] The motion mechanism is used to drive the telescopic air duct to be in a retracted state or an unfolded state.

[0015] Preferably, the motion mechanism comprises a motor, a gear structure and a rack structure;

[0016] The motor is electrically connected to the gear structure, the gear structure is connected to the collar; the rack structure is connected to the telescopic air duct;

[0017] The gear structure and the rack structure drive the telescopic air duct to perform a folding movement or an unfolding movement when the motor is running.

[0018] Preferably, the width of the telescopic air duct is greater than or equal to one third of the width of the main air duct, and the width of the telescopic air duct is less than or equal to one half of the width of the main air duct.

[0019] Preferably, the expandable air suction port structure further comprises: an air duct housing;

[0020] The air duct shell is arranged on the outer surface of the telescopic air duct; the sleeve ring is arranged in the interlayer between the main air duct and the air duct shell;

[0021] The collar and the air duct housing are also used to separate the main air duct and the telescopic air duct when the telescopic air duct is in an unfolded state, so as to keep the interlayer clean.

[0022] Preferably, the expandable air intake structure is arranged on the left side and / or the right side of the range hood.

[0023] The present disclosure also provides a control method for a range hood, which is applied to the range hood as described above, wherein the range hood further comprises a main air duct baffle, and the main air duct baffle is used to adjust the airflow speed of the main air duct suction port by adjusting the rotation angle. The control method for the range hood comprises:

[0024] Obtaining a first airflow velocity at the main air duct suction port;

[0025] When the first air flow speed is different from the preset air flow speed, adjusting the rotation angle of the main air duct baffle according to the operating state of the telescopic air duct so that the air flow speed at the main air duct suction port is the same as the preset air flow speed;

[0026] The operating state includes an unfolded state of the telescopic air duct and a folded state of the telescopic air duct.

[0027] Preferably, when the first air flow speed is different from the preset air flow speed, the step of adjusting the rotation angle of the main air duct baffle according to the operating state of the telescopic air duct comprises:

[0028] When the first airflow speed is less than the preset airflow speed, and the first airflow speed is equal to the first preset airflow speed, and the telescopic air duct provided on the left side or the right side of the range hood is in the unfolded state, adjusting the rotation angle of the main air duct baffle to the first angle;

[0029] and / or,

[0030] When at least one expandable air inlet structure is provided on both the left and right sides of the range hood, if the first airflow velocity is less than a preset airflow velocity, and the first airflow velocity is equal to a second preset airflow velocity, and the telescopic air ducts provided on the left and right sides of the range hood are both in an expanded state, the rotation angle of the main air duct baffle is adjusted to a second angle;

[0031] Among them, the preset air flow speed is greater than the first preset air flow speed, the first preset air flow speed is greater than the second preset air flow speed; the first angle is greater than the second angle.

[0032] Preferably, when the first air flow speed is different from the preset air flow speed, the step of adjusting the rotation angle of the main air duct baffle according to the operating state of the telescopic air duct comprises:

[0033] When the first airflow speed is greater than the preset airflow speed, and the first airflow speed is equal to the third preset airflow speed, and the telescopic air duct is in the retracted state, and the main air duct baffle is currently at the second angle, adjusting the rotation angle of the main air duct baffle to the third angle;

[0034] and / or,

[0035] When the first airflow speed is greater than the preset airflow speed, and the first airflow speed is equal to the fourth preset airflow speed, and the telescopic air duct is in the retracted state, and the main air duct baffle is currently at the first angle, adjusting the rotation angle of the main air duct baffle to a third angle;

[0036] and / or,

[0037] When the first airflow speed is greater than the preset airflow speed, and the first airflow speed is equal to the fifth preset airflow speed, and the telescopic air duct provided on the left side or the right side of the range hood is in the unfolded state, and the main air duct baffle is currently at the second angle, adjusting the rotation angle of the main air duct baffle to the first angle;

[0038] Among them, the preset air flow speed is smaller than the fifth preset air flow speed, the fifth preset air flow speed is smaller than the fourth preset air flow speed, the fourth preset air flow speed is smaller than the third preset air flow speed, and the third angle is larger than the first angle.

[0039] On the basis of being in accordance with the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present disclosure.

[0040] The positive and progressive effects of this disclosure are:

[0041] The expandable air inlet structure disclosed in the present invention forms an inlet in the unfolded state, which increases the width of the smoke outlet of the range hood, and can provide a wider air inlet range when, for example, there are small cooking appliances next to the stove that generate steam or oil smoke. The expandable air inlet structure overlaps with the telescopic air duct in the folded state, and does not affect the appearance of the range hood. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a first structural schematic diagram of a range hood fan system in the prior art;

[0043] Figure 2 It is a second structural schematic diagram of a range hood fan system in the prior art;

[0044] Figure 3 A schematic diagram of the structure of a range hood provided in Embodiment 1 of the present disclosure;

[0045] Figure 4 A schematic diagram of the structure of an expandable air inlet of a range hood provided in Embodiment 1 of the present disclosure;

[0046] Figure 5 It is a schematic diagram of the side structure of a range hood without an expandable air inlet structure in the prior art;

[0047] Figure 6A structural diagram of an expandable air intake port of a range hood in a folded state provided in Embodiment 1 of the present disclosure;

[0048] Figure 7 A structural diagram of an expandable air intake port of a range hood in an unfolded state provided in Embodiment 1 of the present disclosure;

[0049] Figure 8 A schematic diagram of the working state of a range hood provided in Embodiment 1 of the present disclosure;

[0050] Fig. 9 A schematic diagram comparing the widths of a telescopic air duct and a main air duct of a range hood provided in Example 1 of the present disclosure;

[0051] Fig.10 A schematic diagram of the motion mechanism structure of a range hood provided in Embodiment 1 of the present disclosure;

[0052] Fig.11 A flow chart of a range hood control method provided in Embodiment 2 of the present disclosure;

[0053] Fig.12 This is a specific example flow chart of a range hood control method provided in Embodiment 2 of the present disclosure.

[0054] The details of the reference numerals in the accompanying drawings are: main air duct 1, expandable air suction port structure 2, telescopic air duct 21, telescopic air duct top cover 22, collar 23, support frame 24, bayonet 3, motion mechanism 4, motor 41, gear structure 42, rack structure 43 and air duct housing 25. DETAILED DESCRIPTION

[0055] The present disclosure is further described below by way of examples, but the present disclosure is not limited to the scope of the examples.

[0056] Prefixes such as "first" and "second" are used in the embodiments of the present disclosure only to distinguish different description objects, and have no limiting effect on the position, order, priority, quantity or content of the described objects. The use of prefixes such as ordinal numbers to distinguish description objects in the embodiments of the present disclosure does not constitute a limitation on the described objects. For the statement of the described objects, please refer to the description in the context of the claims or embodiments, and no unnecessary limitation should be constituted due to the use of such prefixes. In addition, in the description of the present embodiment, unless otherwise specified, the meaning of "plurality" is two or more.

[0057] Example 1

[0058] This embodiment provides a range hood, see Figure 3The range hood comprises a main air duct 1 and at least one expandable air inlet structure 2. The expandable air inlet structure 2 comprises a telescopic air duct 21, a telescopic air duct top cover 22, a collar 23 and a support frame 24.

[0059] The expandable air inlet structure 2 is arranged on the side of the range hood. Figure 4 It is a structural schematic diagram of the expandable air suction port structure.

[0060] In an optional embodiment, if there is only one expandable air suction port structure 2, it can be arranged on the left side or the right side of the range hood; if there are two expandable air suction port structures 2, they can be arranged on either the left side and the right side.

[0061] The telescopic air duct 21 is connected to the inclined surface of the main air duct 1. The support frame 24 is connected to one side of the telescopic air duct 21. One side of the telescopic air duct top cover 22 is connected to the support frame 24. The other side of the telescopic air duct top cover 22 is connected to the other side of the telescopic air duct 21. The collar 23 is arranged in the interlayer between the main air duct 1 and the telescopic air duct 21. The telescopic air duct top cover 22 overlaps with the telescopic air duct 21 in the retracted state, and the telescopic air duct top cover 22 turns up in the unfolded state, and the telescopic air duct top cover 22 and the telescopic air duct 21 form a suction port.

[0062] The support frame 24 is used to maintain the retractable air duct top cover 22 and the retractable air duct 21 in a retracted state or an unfolded state. The collar 23 is used to guide the unfolding movement of the retractable air duct 21 to ensure smooth contraction of the retractable air duct 21, and can also isolate the oil smoke from other structures of the range hood to ensure the cleanliness of the non-smoke duct structure area.

[0063] Figure 5 It is a side structure of an existing range hood without an expandable air inlet structure; Figure 6 and Figure 7 They are respectively an expandable air intake port structure of the range hood in a folded state and an expandable air intake port structure of the range hood in an unfolded state.

[0064] Figure 8 Schematic diagram of the working status of an exemplary range hood.

[0065] In an optional embodiment, if Fig. 9 As shown, the width L1 of the telescopic air duct 21 is greater than or equal to one third of the width L of the main air duct 1 , and the width L1 of the telescopic air duct 21 is less than or equal to one half of the width L of the main air duct 1 .

[0066] The expandable air inlet structure of this embodiment forms an inlet in the unfolded state, which increases the width of the smoke outlet of the range hood and can provide a wider air inlet range when, for example, there are small cooking appliances next to the stove that generate steam or oil smoke. The expandable air inlet structure overlaps with the telescopic air duct in the folded state, which does not affect the appearance of the range hood and can also return the collected oil smoke stains to the oil box of the range hood.

[0067] In an optional embodiment, the range hood further includes a bayonet 3 .

[0068] The bayonet 3 is connected to the telescopic air duct 21 .

[0069] The closed state and the open state of the bayonet 3 are switched by pressing.

[0070] When the bayonet 3 is in the open state, the telescopic air duct 21 is in the unfolded state.

[0071] When the bayonet 3 is in the closed state, the telescopic air duct 21 is in the retracted state.

[0072] In this embodiment, the expansion state and the retracted state of the telescopic air duct are respectively switched by the opening state and the closing state of the bayonet. The closing state and the opening state of the bayonet are switched by the user manually pressing, that is, in this embodiment, the expandable air inlet structure can be manually expanded or retracted according to the user's needs, so as to realize the personalized needs of the range hood to expand the smoking function.

[0073] In an optional embodiment, if Fig.10 As shown, the expandable air suction port structure 2 also includes a motion mechanism 4.

[0074] The moving mechanism 4 is connected to the telescopic air duct 21 .

[0075] The motion mechanism 4 is used to drive the telescopic air duct 21 to be in a retracted state or an extended state.

[0076] In an optional embodiment, the motion mechanism 4 includes a motor 41 , a gear structure 42 and a rack structure 43 .

[0077] The motor 41 is electrically connected to the gear structure 42, and the gear structure 42 is connected to the collar 23. The rack structure 43 is connected to the telescopic air duct 21.

[0078] When the motor 41 is running, the gear structure 42 and the rack structure 43 drive the telescopic air duct 21 to perform a folding movement or an unfolding movement.

[0079] In this embodiment, the extended air intake port structure can be automatically driven to achieve an unfolded state or a folded state through a motor, a gear structure, a rack structure and other similar motion mechanisms, thereby realizing the automation of the range hood's extended smoking function.

[0080] In an optional embodiment, the expandable air suction port structure 2 further includes: an air duct shell 25.

[0081] The air duct housing 25 is arranged on the outer surface of the telescopic air duct 21. The collar 23 is arranged in the interlayer between the main air duct 1 and the air duct housing 25.

[0082] The collar 23 and the air duct housing 25 are also used to separate the main air duct 1 and the telescopic air duct 21 when the telescopic air duct 21 is in the unfolded state, so as to keep the interlayer clean.

[0083] In this embodiment, the air duct shell can ensure that the interlayer on the side of the range hood is not contaminated by oil smoke, keep the circuit control board in the interlayer on the side of the range hood clean, and increase the service life of the range hood.

[0084] Example 2

[0085] The present embodiment provides a control method for a range hood, which is applied to the range hood of embodiment 1, wherein the range hood further comprises a main air duct baffle, which is used to adjust the airflow speed of the main air duct suction port by adjusting the rotation angle. The main air duct baffle of the present embodiment is usually located at the upper part or side of the range hood, and its main function is to guide the oil smoke to smoothly enter the range hood for exhaust, and to close the air inlet when the range hood is not working to prevent the external oil smoke from flowing back into the kitchen. The design of the main air duct baffle can be fixed or movable, so that it can be opened when the range hood is running to allow the oil smoke to be discharged smoothly.

[0086] See also Fig.11 , the control method of the range hood includes:

[0087] S1. Obtain a first air flow velocity at a suction port of a main air duct.

[0088] S2. When the first air flow velocity is different from the preset air flow velocity, the rotation angle of the main air duct baffle is adjusted according to the operating state of the telescopic air duct so that the air flow velocity at the main air duct suction port is the same as the preset air flow velocity.

[0089] The operating state includes the unfolded state of the telescopic air duct and the retracted state of the telescopic air duct. The preset air flow speed is set according to the actual situation.

[0090] In an optional embodiment, step S2 includes:

[0091] When the first air flow velocity is less than the preset air flow velocity, and the first air flow velocity is equal to the first preset air flow velocity, and the telescopic air duct arranged on the left side or the right side of the range hood is in the unfolded state, the rotation angle of the main air duct baffle is adjusted to the first angle.

[0092] In an optional embodiment, step S2 includes:

[0093] When at least one expandable air intake structure is provided on the left and right sides of the range hood, if the first air flow velocity is lower than the preset air flow velocity, and the first air flow velocity is equal to the second preset air flow velocity, and the telescopic air ducts provided on the left and right sides of the range hood are in the expanded state, the rotation angle of the main air duct baffle is adjusted to the second angle.

[0094] The preset airflow speed is greater than the first preset airflow speed, the first preset airflow speed is greater than the second preset airflow speed, and the first angle is greater than the second angle.

[0095] In an optional embodiment, step S2 includes:

[0096] When the first air flow speed is greater than the preset air flow speed, and the first air flow speed is equal to the third preset air flow speed, and the telescopic air duct is in a retracted state, and the current main air duct baffle is at the second angle, the rotation angle of the main air duct baffle is adjusted to the third angle.

[0097] In an optional embodiment, step S2 includes:

[0098] When the first air flow speed is greater than the preset air flow speed, and the first air flow speed is equal to the fourth preset air flow speed, and the telescopic air duct is in a retracted state, and the current main air duct baffle is at a first angle, the rotation angle of the main air duct baffle is adjusted to a third angle.

[0099] In an optional embodiment, step S2 includes:

[0100] When the first air flow speed is greater than the preset air flow speed, and the first air flow speed is equal to the fifth preset air flow speed, and the telescopic air duct arranged on the left side or the right side of the range hood is in the expanded state, and when the current main air duct baffle is at the second angle, the rotation angle of the main air duct baffle is adjusted to the first angle.

[0101] Among them, the preset air flow speed is less than the fifth preset air flow speed, the fifth preset air flow speed is less than the fourth preset air flow speed, the fourth preset air flow speed is less than the third preset air flow speed, and the third angle is greater than the first angle.

[0102] In this embodiment, the rotation angle of the main air duct baffle is adjusted so that the air flow velocity of the main air duct suction port is the same as the preset air flow velocity, thereby ensuring the overall oil fume suction effect of the range hood.

[0103] A specific example is introduced below to explain in detail the control method of the range hood of this embodiment.

[0104] The flowchart of this example is as follows Fig.12 As shown:

[0105] S1201. Start the range hood and open the main air duct baffle to a predetermined position.

[0106] S1202. Monitor the first air flow velocity v at the main air duct suction port in real time.

[0107] S1203, determine whether v is equal to the preset airflow velocity v0, if v is equal to v0, execute step S1204; if v is not equal to v0, execute step S1207.

[0108] S1204: Maintain the current state.

[0109] S1205. Turn off the range hood.

[0110] S1206. Close the main air duct baffle of the range hood.

[0111] S1207. Determine the size of v and v0. If v is smaller than v0, execute step S1208; if v is larger than v0, execute step S1212.

[0112] S1208, determine whether v is equal to the first preset airflow velocity v1, if v is equal to v1, execute step S1209; if v is not equal to v1, execute step S1210.

[0113] S1209. If the range hood is in a state where the unilaterally expandable air intake structure is deployed, adjust the main air duct baffle of the range hood to a first angle a, and return to step S1202.

[0114] S1210, determine whether v is equal to the second preset airflow speed v2, if v is equal to v2, execute step S1211.

[0115] S1211. If the range hood is in the expanded state of the double-sided expandable air intake structure, adjust the main air duct baffle of the range hood to the second angle b, and return to step S1202.

[0116] Among them, v0 is greater than v1, v1 is greater than v2; a is greater than b.

[0117] S1212, determine whether v is equal to the third preset airflow speed v3, if v is equal to v3, execute step S1213; if v is not equal to v3, execute step S1214.

[0118] S1213. If the range hood is in a state where the double-sided expandable air intake structure is folded, and the main air duct baffle is located at an angle b, adjust the main air duct baffle of the range hood to a third angle, and return to step S1202.

[0119] Among them, the third angle is the initial angle of the main air duct baffle of the range hood, which is usually set to 90 degrees.

[0120] S1214, determine whether v is equal to the fourth preset airflow speed v4, if v is equal to v4, execute step S1215; if v is not equal to v4, execute step S1216.

[0121] S1215. If the range hood is in a state where the double-sided expandable air intake structure is folded, and the main air duct baffle is located at an angle a, adjust the main air duct baffle of the range hood to a third angle, and return to step S1202.

[0122] S1216. Determine whether v is equal to the fifth preset airflow speed v5. If v is equal to v5, execute step S1217.

[0123] S1217. If the range hood is in the expanded state of the unilaterally expandable air intake structure, and the main air duct baffle is located at an angle of b, adjust the angle of the main air duct baffle of the range hood to a, and return to step S1202.

[0124] Among them, v0 is smaller than v5, v5 is smaller than v4, v4 is smaller than v3, and the third angle is greater than a.

[0125] It should be noted that v is the real-time detected air flow velocity of the main air duct suction port in this example; v0 is the ideal air flow velocity when the main air duct baffle is set at the initial angle, and the expandable air suction port structure is in the retracted state; v1 is the ideal air flow velocity when the main air duct baffle is set at a, and the single-sided expandable air suction port structure is in the expanded state; v2 is the ideal air flow velocity when the main air duct baffle is set at b, and the double-sided expandable air suction port structure is in the expanded state; v3 is the ideal air flow velocity when the main air duct baffle is set at b, and the expandable air suction port structure is in the retracted state; v4 is the ideal air flow velocity when the main air duct baffle is set at a, and the expandable air suction port structure is in the retracted state; v5 is the ideal air flow velocity when the main air duct baffle is set at b, and the single-sided expandable air suction port structure is in the expanded state.

[0126] Although the specific embodiments of the present disclosure are described above, those skilled in the art should understand that this is only an example, and the protection scope of the present disclosure is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present disclosure, but these changes and modifications all fall within the protection scope of the present disclosure.

Claims

1. A range hood, characterized in that: The range hood comprises a main air duct and at least one expandable air suction port structure; the expandable air suction port structure comprises a telescopic air duct, a telescopic air duct top cover, a collar and a support frame; The expandable air suction port structure is arranged on the side of the range hood; the telescopic air duct is connected to the inclined surface of the main air duct; the support frame is connected to one side of the telescopic air duct; one side of the telescopic air duct top cover is connected to the support frame; the other side of the telescopic air duct top cover is connected to the other side of the telescopic air duct; the collar is arranged in the interlayer between the main air duct and the telescopic air duct; the telescopic air duct top cover overlaps with the telescopic air duct in the retracted state, and the telescopic air duct top cover flips up in the unfolded state, and the telescopic air duct top cover and the telescopic air duct form a suction port; The support frame is used to maintain the retractable air duct top cover and the retractable air duct in a retracted state or an unfolded state; the sleeve ring is used to guide the unfolding movement of the retractable air duct.

2. The range hood according to claim 1, characterized in that: The range hood further comprises a bayonet; The bayonet is connected to the telescopic air duct; The closed state and the open state of the bayonet are switched by pressing; When the bayonet is in an open state, the telescopic air duct is in an expanded state.

3. The range hood according to claim 1, characterized in that: The expandable air suction port structure also includes a motion mechanism; The movement mechanism is connected to the telescopic air duct; The motion mechanism is used to drive the telescopic air duct to be in a retracted state or an unfolded state.

4. The range hood according to claim 3, characterized in that: The motion mechanism includes a motor, a gear structure and a rack structure; The motor is electrically connected to the gear structure, the gear structure is connected to the collar; the rack structure is connected to the telescopic air duct; The gear structure and the rack structure drive the telescopic air duct to perform a folding movement or an unfolding movement when the motor is running.

5. The range hood according to claim 1, characterized in that: The width of the telescopic air duct is greater than or equal to one third of the width of the main air duct, and the width of the telescopic air duct is less than or equal to one half of the width of the main air duct.

6. The range hood according to claim 1, characterized in that: The expandable air suction port structure further includes: an air duct housing; The air duct shell is arranged on the outer surface of the telescopic air duct; the sleeve ring is arranged in the interlayer between the main air duct and the air duct shell; The collar and the air duct housing are also used to separate the main air duct and the telescopic air duct when the telescopic air duct is in an unfolded state, so as to keep the interlayer clean.

7. The range hood according to claim 1, characterized in that: The expandable air inlet structure is arranged on the left side and / or the right side of the range hood.

8. A method for controlling a range hood, characterized in that: Applied to the range hood according to any one of claims 1 to 7, the range hood further comprises a main air duct baffle, the main air duct baffle is used to adjust the air flow speed of the main air duct suction port by adjusting the rotation angle, and the control method of the range hood comprises: Obtaining a first airflow velocity at the main air duct suction port; When the first air flow speed is different from the preset air flow speed, adjusting the rotation angle of the main air duct baffle according to the operating state of the telescopic air duct so that the air flow speed at the main air duct suction port is the same as the preset air flow speed; The operating state includes an unfolded state of the telescopic air duct and a folded state of the telescopic air duct.

9. The control method of the range hood according to claim 8, characterized in that: When the first air flow speed is different from the preset air flow speed, the step of adjusting the rotation angle of the main air duct baffle according to the operating state of the telescopic air duct comprises: When the first airflow speed is less than the preset airflow speed, and the first airflow speed is equal to the first preset airflow speed, and the telescopic air duct provided on the left side or the right side of the range hood is in the unfolded state, adjusting the rotation angle of the main air duct baffle to the first angle; and / or, When at least one expandable air inlet structure is provided on both the left and right sides of the range hood, if the first airflow velocity is less than a preset airflow velocity, and the first airflow velocity is equal to a second preset airflow velocity, and the telescopic air ducts provided on the left and right sides of the range hood are both in an expanded state, the rotation angle of the main air duct baffle is adjusted to a second angle; Among them, the preset air flow speed is greater than the first preset air flow speed, the first preset air flow speed is greater than the second preset air flow speed; the first angle is greater than the second angle.

10. The control method of the range hood according to claim 9, characterized in that: When the first air flow speed is different from the preset air flow speed, the step of adjusting the rotation angle of the main air duct baffle according to the operating state of the telescopic air duct comprises: When the first airflow speed is greater than the preset airflow speed, and the first airflow speed is equal to the third preset airflow speed, and the telescopic air duct is in the retracted state, and the main air duct baffle is currently at the second angle, adjusting the rotation angle of the main air duct baffle to the third angle; and / or, When the first airflow speed is greater than the preset airflow speed, and the first airflow speed is equal to the fourth preset airflow speed, and the telescopic air duct is in the retracted state, and the main air duct baffle is currently at the first angle, adjusting the rotation angle of the main air duct baffle to a third angle; and / or, When the first airflow speed is greater than the preset airflow speed, and the first airflow speed is equal to the fifth preset airflow speed, and the telescopic air duct provided on the left side or the right side of the range hood is in the unfolded state, and the main air duct baffle is currently at the second angle, adjusting the rotation angle of the main air duct baffle to the first angle; Among them, the preset air flow speed is smaller than the fifth preset air flow speed, the fifth preset air flow speed is smaller than the fourth preset air flow speed, the fourth preset air flow speed is smaller than the third preset air flow speed, and the third angle is larger than the first angle.

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