A method for adjusting the gear of a range hood

Abstract

The application discloses a kind of range adjustment methods of range hood, by controlling the power switch of range hood to open, the external voltage of range hood power cord is monitored to obtain actual external voltage value, actual external voltage value is delivered to range hood controller, controller selects control logic in pre-set gear according to actual external voltage value, then corresponding control switch is selected to open, fan runs according to the gear opened by controller, when external voltage changes, controller adjusts in real time according to voltage change to switch gear intelligently among multiple gears, so as to realize the adjustment of driving motor working voltage by adjusting the resistance value of adjustable resistor connected in series with fan, so as to ensure the stable performance of range hood.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of household appliances, in particular to a range adjusting method of a range hood. BACKGROUND

[0002] In the prior art, most range hoods equipped with AC asynchronous motors do not have voltage detection adjustment function, the actual domestic voltage range is 198-242V, with a span of 44V, voltage fluctuation has a great influence on the performance of AC motors, the higher the voltage, the greater the motor noise, and when the voltage is low, the suction capacity of the range hood will also decrease, and the performance instability caused by voltage will seriously affect the quality of the range hood. SUMMARY

[0003] The present application aims to at least solve one of the problems existing in the prior art, for this purpose, the present application provides a range adjusting method of a range hood, which is simple and feasible, by detecting the external voltage of the range hood and according to the size of the detected external voltage of the range hood, automatically matching the appropriate range to control the range hood to work according to the matched range information, so as to ensure the stable performance of the range hood.

[0004] The above-mentioned purpose is achieved by the following technical solutions:

[0005] A range adjusting method of a range hood, the range hood comprising a driving motor of a fan connected in series with an external power supply and an adjustable resistor, the range adjusting method comprising the following steps:

[0006] The adjustable resistor is pre-provided with a plurality of different resistance access ranges, each of the ranges has a different resistance value connected in series and is divided according to the voltage value of the external power supply; wherein the boost regulation ratio of the driving motor corresponding to a plurality of the ranges is negatively correlated with the voltage value of the external power supply;

[0007] Turning on the range hood;

[0008] Detecting the voltage of the external power supply of the range hood to obtain the current actual external voltage value;

[0009] Matching the current actual external voltage value with the external voltage values corresponding to a plurality of the ranges to obtain the range corresponding to the current actual external voltage value;

[0010] According to the range, the adjustable resistor is connected to the series circuit, and the working voltage of the driving motor is adjusted to make the range hood work stably.

[0011] In some embodiments, the adjustable resistor is pre-provided with a plurality of different resistance access gears, each of which has a different resistance value of the series circuit and is divided according to the voltage value of the external power supply; wherein the step of the plurality of gears corresponding to the boost regulation proportion of the driving motor and the voltage value of the external power supply being in a negative correlation comprises:

[0012] The reference gear is pre-provided, and when the actual external voltage value is 220V, the working voltage value of the fan is less than or equal to 198V, and the reference resistance value of the adjustable resistor is 15% of the actual resistance value of the fan.

[0013] A plurality of gears are pre-provided according to the voltage value of the external power supply from small to large, and the boost regulation proportion of the driving motor corresponding to the plurality of gears is sequentially decreased.

[0014] In some embodiments, the plurality of gears are pre-provided according to the voltage value of the external power supply from small to large, and the boost regulation proportion of the driving motor corresponding to the plurality of gears is sequentially decreased.

[0015] The first gear has a voltage value of the external power supply greater than or equal to 100V and less than 200V, and the boost regulation proportion of the corresponding driving motor is 12.5%;

[0016] The second gear has a voltage value of the external power supply greater than or equal to 200V and less than 205V, and the boost regulation proportion of the corresponding driving motor is 9.5%;

[0017] The third gear has a voltage value of the external power supply greater than or equal to 205V and less than 210V, and the boost regulation proportion of the corresponding driving motor is 7%;

[0018] The fourth gear has a voltage value of the external power supply greater than or equal to 210V and less than 215V, and the boost regulation proportion of the corresponding driving motor is 4.5%;

[0019] The fifth gear has a voltage value of the external power supply greater than or equal to 215V and less than 220V, and the boost regulation proportion of the corresponding driving motor is 2%;

[0020] The sixth gear has a voltage value of the external power supply greater than or equal to 220V and less than 225V, and the boost regulation proportion of the corresponding driving motor is 0%;

[0021] The seventh gear has a voltage value of the external power supply greater than or equal to 225V and less than 230V, and the boost regulation proportion of the corresponding driving motor is -2.2%;

[0022] an eighth gear, a voltage value of an external power supply thereof is greater than or equal to 230V and less than 235V, and a corresponding boost regulation ratio of a driving motor thereof is -4.4%;

[0023] a ninth gear, a voltage value of an external power supply thereof is greater than or equal to 235V and less than 240V, and a corresponding boost regulation ratio of a driving motor thereof is -6.6%;

[0024] a tenth gear, a voltage value of an external power supply thereof is greater than or equal to 240V and less than 300V, and a corresponding boost regulation ratio of a driving motor thereof is -8.5%.

[0025] In some embodiments, the step of adjusting the working voltage of the driving motor to stabilize the operation of the range hood by connecting the adjustable resistor to the series circuit according to the corresponding gear comprises:

[0026] calculating the corresponding boost regulation ratio of the matched gear by a calculation formula to obtain an adjusted resistor value;

[0027] controlling the fan to work according to the calculated adjusted resistor value to adjust the working voltage of the driving motor to stabilize the operation of the range hood.

[0028] In some embodiments, the adjusted resistor value is calculated by the following calculation formula: R i = (R0+R 基准 ) / (1+ai)-R0, wherein R i is the adjusted resistor value, R0is the working resistor value of the driving motor, R 基准 is the reference resistor value of the adjustable resistor, and aiis the boost regulation ratio of the driving motor corresponding to each gear.

[0029] In some embodiments, the step of adjusting the working voltage of the driving motor to stabilize the operation of the range hood by connecting the adjustable resistor to the series circuit according to the corresponding gear comprises:

[0030] continuously monitoring the voltage of the external power supply of the range hood;

[0031] when the voltage of the external power supply of the range hood changes, continuously matching the corresponding gear according to the voltage of the external power supply of the range hood among a plurality of gears;

[0032] connecting the adjustable resistor to the series circuit according to the corresponding gear to adjust the working voltage of the driving motor, and repeating the above steps to stabilize the operation of the range hood.

[0033] In some embodiments, if the current actual external voltage value does not match any of the external voltage values corresponding to the plurality of gears, the range hood is turned off.

[0034] In some embodiments, a voltage sensor is arranged at the input end of the power supply line of the range hood, and the external voltage of the range hood is detected by detecting the voltage signal at the input end of the power supply line of the range hood.

[0035] In some embodiments, a plurality of interfaces are arranged on the adjustable resistor, and the plurality of interfaces are arranged corresponding to the plurality of gears, and each interface is electrically connected to the controller through a lead.

[0036] In some embodiments, a plurality of control switches are further included, and the plurality of control switches are connected to the plurality of interfaces respectively to control the switch of the single gear.

[0037] In some embodiments, the lengths of the plurality of interfaces are different.

[0038] Compared with the prior art, the present application has at least the following advantages:

[0039] The range adjustment method of the range hood of the present application is simple and feasible, and the external voltage of the range hood is detected, and the appropriate gear is matched automatically according to the detected external voltage of the range hood, so that the range hood works according to the matched gear information, thereby ensuring the stable performance of the range hood. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0041] Figure 1 is a flowchart of the range adjustment method in the embodiments of the present application. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely in combination with the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. The components of the embodiments of the present application can be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of the technical solutions claimed by the application.

[0044] Embodiment:

[0045] As Figure 1 shown, the embodiment provides a range adjustment method of a range hood, the range hood comprising a driving motor of a fan and an adjustable resistor connected in series, and a plurality of interfaces are respectively arranged on the adjustable resistor, the plurality of interfaces are arranged corresponding to a plurality of ranges, each interface is electrically connected to a controller through a lead, a plurality of control switches are respectively connected to the plurality of interfaces to control the switch of a single range, and the length positions of each interface are different. Specifically, the adjustable resistor is made into a long strip, 10 different length position interfaces are led out to adjust 10 different resistors, each resistor interface is separately led, and each interface is finally connected to the control switch on the circuit board through the lead.

[0046] In addition, a voltage sensor is arranged at the input end of the power line of the range hood, the voltage signal at the input end of the power line of the range hood is detected to obtain the external voltage of the range hood, the voltage sensor transmits the real-time detected external voltage value to the controller of the range hood, the controller of the range hood matches the received external voltage value with the external voltage value corresponding to each range to match the corresponding range, then the matched range control switch is selected to be opened to drive the fan to work, and if the actual external voltage value is not successfully matched in the set external voltage values corresponding to the plurality of ranges, the range hood is closed.

[0047] In the embodiment, the power switch of the range hood is opened, the external voltage of the power line of the range hood is monitored to obtain the actual external voltage value, the actual external voltage value is transmitted to the controller of the range hood, the controller selects the control logic in the pre-set range according to the actual external voltage value, then the corresponding control switch is selected to be opened, and the fan is operated according to the range opened by the controller. When the external voltage changes, the controller adjusts in real time according to the voltage change to intelligently switch the range among the plurality of ranges, so that the resistance value of the adjustable resistor connected in series with the fan is adjusted to realize the adjustment of the working voltage of the driving motor, thereby ensuring the stable performance of the range hood. The method is simple and feasible, the external voltage of the range hood is detected, and the appropriate range is automatically matched according to the size of the detected external voltage of the range hood to control the range hood to work according to the matched range information, thereby ensuring the stable performance of the range hood.

[0048] The gear adjusting method in the embodiment comprises the following steps:

[0049] In the embodiment, the adjustable resistor is provided with a plurality of different resistance access gears, each gear has different resistance value for accessing the series circuit and is divided according to the voltage value of the external power supply; wherein the boost regulation ratio of the driving motor corresponding to the plurality of gears is negatively correlated with the voltage value of the external power supply.

[0050] In the embodiment, the adjustable resistor is provided with a plurality of different resistance access gears, each gear has different resistance value for accessing the series circuit and is divided according to the voltage value of the external power supply; wherein the boost regulation ratio of the driving motor corresponding to the plurality of gears is negatively correlated with the voltage value of the external power supply.

[0051] The reference gear is provided in advance, and the reference gear is that when the actual external voltage value is 220V, the working voltage value of the fan is less than or equal to 198V, and the reference resistance value of the adjustable resistor is 15% of the actual resistance value of the fan;

[0052] A plurality of gears are provided in advance according to the voltage value of the external power supply from small to large, and the boost regulation ratio of the driving motor corresponding to the plurality of gears is sequentially decreased.

[0053] In the embodiment, a plurality of gears are provided in advance according to the voltage value of the external power supply from small to large, and the boost regulation ratio of the driving motor corresponding to the plurality of gears is sequentially decreased.

[0054] The first gear, the voltage value of the external power supply is greater than or equal to 100V and less than 200V, and the boost regulation ratio of the corresponding driving motor is 12.5%;

[0055] The second gear, the voltage value of the external power supply is greater than or equal to 200V and less than 205V, and the boost regulation ratio of the corresponding driving motor is 9.5%;

[0056] The third gear, the voltage value of the external power supply is greater than or equal to 205V and less than 210V, and the boost regulation ratio of the corresponding driving motor is 7%;

[0057] The fourth gear, the voltage value of the external power supply is greater than or equal to 210V and less than 215V, and the boost regulation ratio of the corresponding driving motor is 4.5%;

[0058] The fifth gear, the voltage value of the external power supply is greater than or equal to 215V and less than 220V, and the boost regulation ratio of the corresponding driving motor is 2%;

[0059] The sixth gear, the voltage value of the external power supply is greater than or equal to 220V and less than 225V, and the corresponding driving motor voltage regulation ratio is 0%;

[0060] The seventh gear, the voltage value of the external power supply is greater than or equal to 225V and less than 230V, and the corresponding driving motor voltage regulation ratio is -2.2%;

[0061] The eighth gear, the voltage value of the external power supply is greater than or equal to 230V and less than 235V, and the corresponding driving motor voltage regulation ratio is -4.4%;

[0062] The ninth gear, the voltage value of the external power supply is greater than or equal to 235V and less than 240V, and the corresponding driving motor voltage regulation ratio is -6.6%;

[0063] The tenth gear, the voltage value of the external power supply is greater than or equal to 240V and less than 300V, and the corresponding driving motor voltage regulation ratio is -8.5%.

[0064] Step S102, turn on the range hood.

[0065] Step S103, detect the voltage of the external power supply of the range hood to obtain the current actual external voltage value.

[0066] Step S104, match the current actual external voltage value with the external voltage value corresponding to a plurality of gears, and obtain the gear corresponding to the current actual external voltage value.

[0067] Step S105, according to the corresponding gear, connect the adjustable resistor to the series circuit, adjust the working voltage of the driving motor to make the range hood work stably.

[0068] Specifically, the step of adjusting the working voltage of the driving motor to make the range hood work stably according to the corresponding gear includes:

[0069] The corresponding voltage regulation ratio of the matched gear is calculated by the calculation formula to obtain the adjustment resistance value;

[0070] According to the calculated adjustment resistance value, the fan is controlled to work, and the working voltage of the driving motor is adjusted to make the range hood work stably.

[0071] In this embodiment, the adjustment resistance value is calculated by the following calculation formula: R i = (R0+R 基准 ) / (1+ai) -R0, wherein R i is the adjustment resistance value, R0 is the working voltage value of the driving motor, and R 基准The reference resistance value of the adjustable resistance, ai is the boost adjustment ratio of the driving motor corresponding to each gear.

[0072] In the embodiment, the step of controlling the fan to work according to the calculated adjustment resistance value and adjusting the working voltage of the driving motor to make the range hood work stably comprises:

[0073] Continuously monitoring the voltage of the external power supply of the range hood;

[0074] When the voltage of the external power supply of the range hood changes, the corresponding gear is matched from the multiple gears according to the voltage of the external power supply of the range hood;

[0075] The adjustable resistance corresponding to the gear is connected to the series circuit to adjust the working voltage of the driving motor, and the cycle is repeated to make the range hood work stably.

[0076] More preferably, the resistance value of the adjustable resistance connected in series with the fan driving motor is adjusted to realize the adjustment of the working voltage of the driving motor. Since the adjustable resistance connected in series is a long strip, the resistance value of the adjustable resistance is adjusted by connecting the lead of different lengths. The adjustable resistance should meet the complete resistance of the series. The reference resistance value R of the adjustable resistance connected in the reference gear is greater than or equal to 11.11% of the actual resistance value of the fan when the actual external voltage value is 220V, and the working voltage value of the driving motor is less than or equal to 198V. 基准 According to the calculation of the resistance ratio, the reference resistance value of the adjustable resistance is greater than or equal to 11.11% of the actual resistance value of the fan. In order to meet the design requirements of the boost and buck gears at the same time, the reference resistance value of the adjustable resistance is greater than or equal to 15% of the actual resistance value of the driving motor. Since the adjustment formula of the motor voltage is , wherein the working resistance value of the driving motor is R0, the external resistance value of the adjustable resistance is R, the external voltage value of the range hood is U, and the working voltage value of the driving motor is U0. According to the above calculation formula, the size of the adjustable resistance can be adjusted to realize the adjustment of the working voltage of the driving motor, and the adjustment of the working voltage of the driving motor changes by 1 / (1+R / R0) proportion. The voltage regulation ratio of the i-th gear in the multiple gears is ai, and then the adjustment resistance value is calculated by the following calculation formula: R i = (R0+R 基准 ) / (1+ai)-R0, wherein R i is the adjustment resistance value, R0 is the working resistance value of the driving motor, and R 基准 is the reference resistance value of the adjustable resistance, and ai is the boost adjustment ratio of the driving motor corresponding to each gear.

[0077] The gear information of the multiple gears specifically comprises:

[0078] The first gear, the external voltage value is greater than or equal to 100V and less than 200V, and its voltage regulating ratio is 12.5%, then the above calculation formula of the adjusting resistance value can be calculated R1= (R0+R 基准 ) / (1+12.5%) -R0, so as to obtain the adjusted resistance value R1 according to the calculation result;

[0079] The second gear, the external voltage value is greater than or equal to 200V and less than 205V, and its voltage regulating ratio is 9.5%, then the above calculation formula of the adjusting resistance value can be calculated R2= (R0+R 基准 ) / (1+9.5%) -R0, so as to obtain the adjusted resistance value R2 according to the calculation result;

[0080] The third gear, the external voltage value is greater than or equal to 205V and less than 210V, and its voltage regulating ratio is 7%, then the above calculation formula of the adjusting resistance value can be calculated R3= (R0+R 基准 ) / (1+7%) -R0, so as to obtain the adjusted resistance value R3 according to the calculation result;

[0081] The fourth gear, the external voltage value is greater than or equal to 210V and less than 215V, and its voltage regulating ratio is 4.5%, then the above calculation formula of the adjusting resistance value can be calculated R4= (R0+R 基准 ) / (1+4.5%) -R0, so as to obtain the adjusted resistance value R4 according to the calculation result;

[0082] The fifth gear, the external voltage value is greater than or equal to 215V and less than 220V, and its voltage regulating ratio is 2%, then the above calculation formula of the adjusting resistance value can be calculated R5= (R0+R 基准 ) / (1+2%) -R0, so as to obtain the adjusted resistance value R5 according to the calculation result;

[0083] The sixth gear, the external voltage value is greater than or equal to 220V and less than 225V, and its voltage regulating ratio is 0%, then the reference resistance value of the adjustable resistance is taken as the voltage ratio of the driving motor at this time;

[0084] The seventh gear, the external voltage value is greater than or equal to 225V and less than 230V, and its voltage regulating ratio is -2.2%, then the above calculation formula of the adjusting resistance value can be calculated R7= (R0+R 基准 ) / (1-2.2%) -R0, so as to obtain the adjusted resistance value R7 according to the calculation result;

[0085] The eighth gear, the external voltage value is greater than or equal to 230V and less than 235V, and the voltage regulating ratio is-4.4%, then the regulating resistance value R8= (R0+R 基准 ) / (1-4.4%) -R0 can be calculated through the above calculation formula, so as to obtain the adjusted regulating resistance value R8 according to the calculation result;

[0086] The ninth gear, the external voltage value is greater than or equal to 235V and less than 240V, and the voltage regulating ratio is-6.6%, then the regulating resistance value R9= (R0+R 基准 ) / (1-6.6%) -R0 can be calculated through the above calculation formula, so as to obtain the adjusted regulating resistance value R9 according to the calculation result;

[0087] The tenth gear, the external voltage value is greater than or equal to 240V and less than 300V, and the voltage regulating ratio is-8.5%, then the regulating resistance value R 10 = (R0+R 基准 ) / (1-8.5%) -R0 can be calculated through the above calculation formula, so as to obtain the adjusted regulating resistance value R 10 .

[0088] The above only describes some embodiments of the present application. For those skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are all within the protection scope of the present application.

Claims

1. A method of adjusting the speed of a range hood, the method comprising: The range adjusting method comprises the following steps: The adjustable resistor is provided with a plurality of different resistance access ranges in advance, the resistance value of each range is different and is divided according to the voltage value of the external power supply; wherein the boost regulation proportion of the driving motor corresponding to the plurality of ranges is negatively correlated with the voltage value of the external power supply; Turning on the range hood; Detecting the voltage of the external power supply of the range hood to obtain the current actual external voltage value; Matching the current actual external voltage value with the external voltage values corresponding to the plurality of ranges to obtain the range corresponding to the current actual external voltage value; According to the range, the adjustable resistor is accessed to the series circuit, and the working voltage of the driving motor is adjusted to make the range hood work stably.

2. The range adjustment method of a range hood according to claim 1, wherein The adjustable resistor is provided with a plurality of different resistance access ranges in advance, the resistance value of each range is different and is divided according to the voltage value of the external power supply; wherein the boost regulation proportion of the driving motor corresponding to the plurality of ranges is negatively correlated with the voltage value of the external power supply; The reference range is set in advance, the working voltage value of the driving motor is less than or equal to 198V when the actual external voltage value is 220V, and the reference resistance value of the adjustable resistor is 15% of the actual resistance value of the fan; A plurality of ranges are set in advance according to the voltage value of the external power supply from small to large, and the boost regulation proportion of the driving motor corresponding to the plurality of ranges is sequentially decreased.

3. The method of claim 2, wherein, The adjustable resistor is provided with a plurality of different resistance access ranges in advance, the resistance value of each range is different and is divided according to the voltage value of the external power supply; wherein the boost regulation proportion of the driving motor corresponding to the plurality of ranges is negatively correlated with the voltage value of the external power supply; The first range, the voltage value of the external power supply is greater than or equal to 100V and less than 200V, and the boost regulation proportion of the corresponding driving motor is 12.5%; The second range, the voltage value of the external power supply is greater than or equal to 200V and less than 205V, and the boost regulation proportion of the corresponding driving motor is 9.5%; The third range, the voltage value of the external power supply is greater than or equal to 205V and less than 210V, and the boost regulation proportion of the corresponding driving motor is 7%; The fourth range, the voltage value of the external power supply is greater than or equal to 210V and less than 215V, and the boost regulation proportion of the corresponding driving motor is 4.5%; The fifth range, the voltage value of the external power supply is greater than or equal to 215V and less than 220V, and the boost regulation proportion of the corresponding driving motor is 2%; The sixth range, the voltage value of the external power supply is greater than or equal to 220V and less than 225V, and the boost regulation proportion of the corresponding driving motor is 0%; The seventh range, the voltage value of the external power supply is greater than or equal to 225V and less than 230V, and the boost regulation proportion of the corresponding driving motor is-2.2%. The eighth gear, the voltage value of the external power supply is greater than or equal to 230V and less than 235V, and the corresponding driving motor boost regulation ratio is-4.4%; The ninth gear, the voltage value of the external power supply is greater than or equal to 235V and less than 240V, and the corresponding driving motor boost regulation ratio is-6.6%; The tenth gear, the voltage value of the external power supply is greater than or equal to 240V and less than 300V, and the corresponding driving motor boost regulation ratio is-8.5%.

4. The method of claim 2, wherein, The step of adjusting the working voltage of the driving motor to make the range hood work stably by connecting the adjustable resistor to the series circuit according to the corresponding gear includes: The corresponding voltage regulation ratio of the matched gear is calculated by the calculation formula to obtain the adjustment resistor value; According to the calculated adjustment resistor value, the fan is controlled to work, and the working voltage of the driving motor is adjusted to make the range hood work stably.

5. The method of claim 4, wherein, The adjusted resistance value is calculated by the following formula: R i = (R0+R 基准 ) / (1+ai) - R0, wherein R i is the adjusted resistance value, R0 is the working resistance value of the driving motor, R 基准 is the reference resistance value of the adjustable resistance, and ai is the boost adjustment ratio of the driving motor corresponding to each gear.

6. The method of claim 1, wherein, The step of adjusting the working voltage of the driving motor to make the range hood work stably by connecting the adjustable resistor to the series circuit according to the corresponding gear includes: The voltage of the external power supply of the range hood is continuously monitored; When the voltage of the external power supply of the range hood changes, the corresponding gear is matched according to the voltage of the external power supply of the range hood among the multiple gears; The working voltage of the driving motor is adjusted by connecting the adjustable resistor to the series circuit according to the corresponding gear, and the cycle is repeated to make the range hood work stably.

7. The method of claim 1, wherein, If the current actual external voltage value does not match successfully among the corresponding external voltage values of the multiple gears, the range hood is turned off.

8. The method of claim 1, wherein, A voltage sensor is arranged at the input end of the power supply line of the range hood, and the external voltage of the range hood is obtained by detecting the voltage signal of the input end of the power supply line of the range hood.

9. The method of claim 1, wherein, Multiple interfaces are arranged on the adjustable resistor, and the multiple interfaces are arranged corresponding to the multiple gears, and each interface is electrically connected to the controller through a lead.

10. The range adjustment method of a range hood according to claim 9, wherein Multiple control switches are further included, and the multiple control switches are respectively connected to the multiple interfaces to control the switch of a single gear.

11. The method of claim 9, wherein, The length positions of each interface are different.

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