Range hood and control method thereof

Abstract

The invention relates to a range hood and a control method thereof, and the range hood comprises: a housing, the front side of which is provided with an air inlet; the device is characterized by further comprising a transmitting module which comprises a transmitter used for transmitting pulsed light; the detection module comprises an optical fiber and a detector, the optical fiber is arranged close to the air inlet, the pulsed light emitted by the emitter is spread in the extension direction of the optical fiber, and the detector is used for receiving a Raman scattering signal generated by scattering of the pulsed light in the optical fiber so as to obtain the temperature of each position on the optical fiber. According to the range hood, real-time reconstruction of the temperature field and accurate tracing of the oil smoke generation mechanism are achieved, the response speed of a smoke exhaust system is increased, therefore, the cooking action of a user and air volume control are more accurately and reliably pre-judged, accurate control over a draught fan of the range hood is achieved, and the oil smoke suction effect and the user experience feeling are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of oil fume purification, and particularly to a range hood and a control method thereof. Background Art

[0002] As an essential kitchen appliance in every family, a range hood sucks oil fume from the air inlet through an impeller rotating at a high speed in a volute, filters the oil fume by the impeller, and discharges the filtered oil fume from the air outlet, thus completing the purification of kitchen air.

[0003] The fan of a traditional range hood operates at a fixed gear or speed and cannot automatically adjust the gear of the fan according to the oil fume volume in different cooking scenarios. In order to detect oil fume, the prior art uses the principle that oil fume affects the refractive index of light in the air to judge the size of oil fume. However, this method can only detect when the oil fume reaches the position of the oil fume sensor on the range hood, with a slow response speed and a lagging action, and it is impossible to predict the actual actions of users in advance.

[0004] In addition, in the prior art, the method of adjusting the gear of the fan by infrared temperature measurement is adopted. For example, Chinese Patent No. CN202011065588.0 (Publication No. CN112146147) discloses a control method, device and range hood based on infrared temperature measurement. This method embeds an infrared temperature measurement module of the infrared temperature measurement module on the range hood to detect the temperature in the cooking pot. Although this method can realize the automatic control of the switch and gear size of the range hood by detecting the temperature in the boiler, the infrared temperature measurement module measures the average temperature in the field of view, and the installation height of the infrared temperature measurement module and the size of the cookware have a great influence on the measured value, and thus the judgment of many scenarios is inaccurate. Especially when a fixed viewing angle is adopted, it is easy to cause a slow or inaccurate working condition recognition when the installation height or the size of the cookware deviates. Therefore, it is necessary to further improve the prior art. Summary of the Invention

[0005] The first technical problem to be solved by the present invention is to provide a range hood that can accurately predict the working condition by measuring the temperature change in view of the above prior art.

[0006] The second technical problem to be solved by the present invention is to provide a control method for the above range hood, which can accurately adjust the rotation speed of the fan.

[0007] The technical solution adopted by the present invention to solve the above first technical problem is: a range hood, comprising:

[0008] A housing, having an air inlet opened on its front side;

[0009] Characterized in that it further comprises:

[0010] A transmitting module, comprising a transmitter for transmitting pulsed light;

[0011] A detection module, comprising an optical fiber and a detector, the optical fiber being disposed adjacent to the air inlet, and the pulsed light emitted by the transmitter propagating along the extending direction of the optical fiber, the detector being configured to receive Raman scattering signals generated by the scattering of the pulsed light in the optical fiber to obtain the temperature at each position on the optical fiber.

[0012] Preferably, the detection module further comprises a wavelength division multiplexing unit, one end of the wavelength division multiplexing unit being connected to the transmitter, the other end of the wavelength division multiplexing unit being connected to the optical fiber, and the output end of the wavelength division multiplexing unit being connected to the detector.

[0013] To achieve the control of the transmitter, the transmitting module further comprises a driving module electrically connected to the transmitter, the detection module further comprises a signal processing module electrically connected to the detector, and the signal processing module is electrically connected to the driving module.

[0014] To achieve the automatic adjustment of the range hood, a controller and a fan electrically connected to the controller are provided inside the housing, and the controller is further electrically connected to the signal processing module, and the controller is configured to: correspondingly control the fan according to the result of the signal processing module.

[0015] Preferably, the optical fiber is disposed along the left-right direction of the housing.

[0016] To improve the temperature measurement accuracy, the optical fiber is a helical optical fiber.

[0017] To achieve the adjustment of the oil fume flow rate of the range hood, a first air deflector and a second air deflector are further provided inside the housing and are distributed one on the left and one on the right behind the air inlet, and both the first air deflector and the second air deflector can independently deflect relative to the housing to change the air inlet area at the corresponding position of the air inlet.

[0018] The technical solution adopted by the present invention to solve the above second technical problem is: a control method of a range hood as described above, characterized by comprising the following steps:

[0019] Step 1, start the transmitter to cause the transmitter to emit pulsed light;

[0020] Step 2, receive Raman scattering signals through the detector to obtain the temperature at each position on the optical fiber;

[0021] Step 3, process the temperatures at all positions on the optical fiber obtained in Step 2, and determine whether the current oil fume is conventional oil fume or sudden oil fume according to the temperature change result, and make different adjustments to the fan inside the range hood according to the different types of the current oil fume.

[0022] Preferably, the specific control logic for determining whether the current cooking fume is normal cooking fume or sudden cooking fume according to the temperature change result in step 3 is as follows:

[0023] Calculate the temperature gradient of the temperature at all positions on the optical fiber, and perform temperature mutation detection on the calculated temperature gradient. If the temperature mutation value is lower than the preset value, it is determined that the current cooking fume is normal cooking fume; if the temperature mutation value exceeds the preset value, it is determined that the current cooking fume is sudden cooking fume.

[0024] Preferably, when the current cooking fume is normal cooking fume in step 3,

[0025] When the duration t of the normal cooking fume is lower than the time threshold t1, control the fan in the range hood to maintain the current gear;

[0026] When the duration t of the normal cooking fume exceeds the time threshold t1, judge the temperature difference △T within the duration t of the normal cooking fume. If △T is greater than the first temperature difference threshold T1, increase the fan gear in the range hood; if △T is less than or equal to the first temperature difference threshold T1, control the fan in the range hood to maintain the current gear.

[0027] Preferably, if the current cooking fume is sudden cooking fume in step 3, the temperature gradient ▽t is classified as follows:

[0028] When ▽t < T2, control the fan in the range hood to increase by m gears;

[0029] When T2 ≤ ▽t < T3, control the fan in the range hood to increase by n gears;

[0030] When ▽t > T3, adjust the fan gear in the range hood to the maximum gear J;

[0031] Wherein T2, T3, m, and n are all preset constants, m < n, and the higher the fan gear, the faster the fan speed.

[0032] Preferably, the following steps are further included after step 3:

[0033] Step 4: Arrange the optical fiber along the left - right direction of the machine shell, and the optical fiber is arranged in front of the first air deflector and the second air deflector, and obtain the temperature at the front position of the first air deflector and the temperature at the front position of the second air deflector through the optical fiber;

[0034] Step 5: Calculate the absolute value of the temperature difference △T11 between the front position of the first air deflector and the front position of the second air deflector, and perform the following judgment and control:

[0035] If the temperature at the front side position of the first air deflector is higher than the temperature at the front side position of the second air deflector, and △T11>T5, where T5 is the second temperature difference threshold, then deflect the first air deflector relative to the casing to increase the air inlet area at the corresponding position of the first air deflector, and the second air deflector continues to be in the initial position;

[0036] If the temperature at the front side position of the first air deflector is lower than the temperature at the front side position of the second air deflector, and △T11>T5, then deflect the second air deflector relative to the casing to increase the air inlet area at the corresponding position of the second air deflector, and the first air deflector continues to be in the initial position;

[0037] If △T11≤T5, then the first air deflector and the second air deflector continue to be in the initial position.

[0038] Compared with the prior art, the advantages of the present invention are as follows: By adopting the Stokes / anti-Stokes Raman scattering principle and measuring the temperature dependence of the backward scattered light in the optical fiber, continuous temperature measurement along the optical fiber path is realized, solving the problems of inaccurate temperature measurement and slow judgment (mainly only measuring the average temperature in the field of view) of traditional range hoods using infrared temperature measurement, resulting in untimely response and low temperature spatial resolution. Real-time reconstruction of the temperature field and accurate tracing of the oil fume generation mechanism are achieved, the response speed of the exhaust system is improved, so as to more accurately and reliably predict the user's cooking actions and air volume control, and accurately control the fan of the range hood to improve the oil fume extraction effect and user experience. Description of the Drawings

[0039] Figure 1 Schematic diagram of the usage state of the range hood in the embodiment of the present invention;

[0040] Figure 2 Side view of the range hood in the embodiment of the present invention;

[0041] Figure 3 Control block diagram of the range hood in the embodiment of the present invention;

[0042] Figure 4 Flow chart of the control method of the range hood in the embodiment of the present invention;

[0043] Figure 5 Schematic diagram of the temperatures at different positions in the state where the left cooking appliance is in use and the right cooking appliance is not in use in the embodiment of the present invention;

[0044] Figure 6 Schematic diagram of the temperatures at different positions in the state where the right cooking appliance is in use and the left cooking appliance is not in use in the embodiment of the present invention;

[0045] Figure 7 Schematic diagram of the temperatures at different positions in the state where the left cooking appliance is on high heat and the right cooking appliance is on low heat in the embodiment of the present invention. Detailed Description of the Invention

[0046] The present invention will be further described in detail below in conjunction with the embodiments with reference to the accompanying drawings.

[0047] As Figures 1 to 3 shown, the range hood in this embodiment includes a housing 1, a smoke baffle 6 and a fan 5. An air inlet 10 is provided on the front side of the housing 1. The smoke baffle 6 is constrained to the front side of the housing 1 in a rotatable manner to open or close the air inlet 10. The fan 5 is disposed inside the housing 1.

[0048] As Figure 1 shown, a first air guide plate 11 and a second air guide plate 12 are further provided inside the housing 1 of this embodiment and are distributed one on the left and one on the right behind the air inlet 10. Both the first air guide plate 11 and the second air guide plate 12 can independently deflect relative to the housing 1 to change the air inlet area at the corresponding position of the air inlet 10. A first driving mechanism (not shown in the figure) capable of driving the first air guide plate 11 to deflect and a second driving mechanism (not shown in the figure) capable of driving the second air guide plate 12 to deflect are provided inside the housing 1. The above first driving mechanism and second driving mechanism both adopt the prior art and will not be elaborated here. As Figure 2 shown, the first air guide plate 11 and the second air guide plate 12 in this embodiment are both independently arranged behind the air inlet 10 in a manner that their bottom edges can deflect around a straight line extending left and right. The first air guide plate 11 and the second air guide plate 12 can be individually driven by various driving mechanisms to deflect forward to reduce the air inlet area at the corresponding position of the air inlet 10, or deflect backward under the drive of various driving mechanisms to increase the air inlet area at the corresponding position of the air inlet 10.

[0049] The range hood further includes a transmitting module 2 and a detecting module 3. The transmitting module 2 includes a transmitter 21 for emitting pulsed light and a driving module 22 electrically connected to the transmitter 21. The detecting module 3 includes an optical fiber 31, a detector 32, a wavelength division multiplexing unit 33 and a signal processing module 34. As Figure 3 shown, the transmitter 21 in this embodiment is a pulsed laser, and the driving module 22 is a driving circuit for driving the pulsed laser to emit pulses. This driving circuit is the prior art and will not be elaborated here. The optical fiber 31 is disposed adjacent to the air inlet 10. As Figure 1In the present embodiment, the optical fiber 31 is disposed in the oil fume passage within the casing 1, and this optical fiber 31 is a high-temperature resistant armored optical fiber; moreover, the pulsed light emitted by the emitter 21 propagates along the extending direction of the optical fiber 31, and the detector 32 is used to receive the Raman scattering signal generated by the scattering of the pulsed light in the optical fiber 31; one end of the wavelength division multiplexing unit 33 is connected to the emitter 21, the other end of the wavelength division multiplexing unit 33 is connected to the optical fiber 31, and the output end of the wavelength division multiplexing unit 33 is connected to the detector 32; the signal processing module 34 is electrically connected to the detector 32, and the signal processing module 34 is electrically connected to the driving module 22. The detector 32 in the present embodiment is an APD photodetector.

[0050] A controller 4 is provided within the casing 1, and the controller 4 is further electrically connected to the signal processing module 34 and the blower 5. The controller 4 is configured to: correspondingly control the blower 5 according to the result of the signal processing module 34. The controller 4 is further electrically connected to the above-mentioned first driving mechanism and second driving mechanism to realize automatic control of the first air deflector 11 and the second air deflector 12.

[0051] As Figure 1 shown, in the present embodiment, there are cooking stoves distributed one on the left and one on the right below the range hood. In order to distinguish the cooking conditions of the left cooking stove and the right cooking stove, the optical fiber 31 in the present embodiment is arranged along the left-right direction of the casing 1. As Figure 3 shown, the optical fiber 31 in the present embodiment adopts a helical optical fiber, and the resolution of spatial temperature perception is improved through the arrangement of the optical fiber with a helical structure to form a three-dimensional thermal field capture network.

[0052] As Figure 4 shown, the present embodiment also discloses a control method for the above-mentioned range hood, including the following steps:

[0053] Step 1: Start the emitter to cause the emitter to emit pulsed light;

[0054] Before executing Step 1, this control method further includes judging whether the intelligent mode is turned on. If the intelligent mode is turned on, then execute Step 1; otherwise, execute the mode of manually operating the range hood.

[0055] Step 2: Receive the Raman scattering signal through the detector to obtain the temperature at each position on the optical fiber;

[0056] In the present embodiment, the emitter emits a beam of ultrashort laser pulses to the optical fiber (for example: pulse width 1 ns, corresponding spatial resolution 0.1 m); when the laser pulse propagates in the optical fiber, Raman scattering (Stokes light I S and anti-Stokes light I AS )

[0057] The scattered light returns to the detector, and the intensity I of the Stokes light is recorded S(z) and the intensity I of the anti-Stokes light AS (z);

[0058] Convert time and position, specifically: The propagation speed of the laser pulse in the optical fiber is v = c / n (c is the speed of light, n is the refractive index of the optical fiber); then the position formula: Because the round-trip distance of the laser pulse from the emission point to the scattering point is 2z;

[0059] Convert the light intensity ratio and temperature, specifically: mainly utilize that when the temperatures at different positions are different, the light intensity ratio of I S (z) and I AS (z) will change. The higher the temperature T(z) at each position, the stronger the intensity I of the anti-Stokes light AS , and the intensity of the Stokes light basically does not change with temperature. Therefore, the light intensity ratio of I S (z) and I AS (z) can theoretically be written as:

[0060]

[0061] Among them, K R is the Raman coefficient of the optical fiber material (typical value of SiO2 is 1.2×10 -7 ), h is Planck's constant, Δv is the Raman frequency shift constant, k B is the Boltzmann constant, h = 6.626×10 -34 J·ps, Δv = 13.2 THz, k B = 1.38×10 -23 J / K;

[0062] Through experimental calibration, T(z) can be simplified to a quasi-linear relationship T(z) = k(I AS / I S ) + b, where k and b can be adjusted according to the test to compensate for the optical fiber loss;

[0063] Step 3: Process the temperatures at all positions on the optical fiber obtained in Step 2, and determine whether the current cooking fume is normal cooking fume or sudden cooking fume according to the temperature change result, and make different adjustments to the fan in the range hood according to different types of the current cooking fume;

[0064] In this embodiment, the specific control logic for determining whether the current cooking fume is normal cooking fume or sudden cooking fume according to the temperature change result is: calculate the temperature gradient of the temperatures at all positions on the optical fiber, and perform temperature mutation detection on the calculated temperature gradient. If the temperature mutation value is lower than the preset value, it is determined that the current cooking fume is normal cooking fume; if the temperature mutation value exceeds the preset value, it is determined that the current cooking fume is sudden cooking fume; the calculation of the above temperature gradient and the detection of temperature mutation are both prior arts and will not be elaborated here;

[0065] When the current cooking fume is normal cooking fume, when the duration t of the normal cooking fume is lower than the time threshold t1, the fan in the range hood is controlled to maintain the current gear; when the duration t of the normal cooking fume exceeds the time threshold t1, the temperature difference △T within the duration t of the normal cooking fume is judged. If △T is greater than the first temperature difference threshold T1, the gear of the fan in the range hood is increased; if △T is less than or equal to the first temperature difference threshold T1, the fan in the range hood is controlled to maintain the current gear; t1 in this embodiment is 10s;

[0066] If the current cooking fume is sudden cooking fume, the temperature gradient ▽t is classified as follows:

[0067] When ▽t < T2, the fan in the range hood is controlled to increase by m gears;

[0068] When T2 ≤ ▽t < T3, the fan in the range hood is controlled to increase by n gears;

[0069] When ▽t > T3, the fan gear in the range hood is adjusted to the maximum gear J;

[0070] Wherein T2, T3, m and n are all preset constants, m < n, and the higher the fan gear, the faster the fan speed.

[0071] The specific values of the above T2, T3, m and n can be confirmed according to experiments or experience. In this embodiment, m = 1, n = 2, T2 = 5°C / s; T3 = 10°C / s;

[0072] In addition, in order to control the fan and the air deflector according to the cooking conditions of the left cooking stove and the right cooking stove to better extract cooking fume, the following steps are further included after step 3 in this embodiment:

[0073] Step 4: Arrange the optical fiber along the left - right direction of the machine shell, and set the optical fiber in front of the first air deflector and the second air deflector to obtain the temperature at the front position of the first air deflector and the temperature at the front position of the second air deflector;

[0074] Step 5: Calculate the absolute value of the temperature difference △T11 between the front position of the first air deflector and the front position of the second air deflector, and make the following judgment and control:

[0075] If the temperature at the front position of the first air deflector is higher than the temperature at the front position of the second air deflector, and △T11 > T5, where T5 is the second temperature difference threshold, the first air deflector is deflected relative to the machine shell to increase the air inlet area at the corresponding position of the first air deflector, and the second air deflector continues to be in the initial position;

[0076] If the temperature at the front side of the first air deflector is lower than the temperature at the front side of the second air deflector, and △T11 > T5, then the second air deflector is deflected relative to the cabinet to increase the air intake area at the corresponding position of the second air deflector, and the first air deflector remains in the initial position;

[0077] If △T11 ≤ T5, then the first air deflector and the second air deflector remain in the initial position.

[0078] The specific value of T5 can be determined according to experiments or experience. In this embodiment, T5 = 5°C.

[0079] When only the left cooking appliance is in use and the right cooking appliance is not in use, the schematic diagram of the temperature T(z) at different positions of the optical fiber obtained by the signal processing module is as Figure 5 shown; when the left cooking appliance is not in use and only the right cooking appliance is in use, the schematic diagram of the temperature T(z) at different positions of the optical fiber obtained by the signal processing module is as Figure 6 shown; when the left cooking appliance is on high heat (stir-frying scenario) and the right cooking appliance is on low heat (steaming scenario), the schematic diagram of the temperature T(z) at different positions of the optical fiber obtained by the signal processing module is as Figure 7 shown; therefore, when the temperature at the front side of the first air deflector is higher than the temperature at the front side of the second air deflector, and △T11 > T5, that is, it corresponds to the Figure 5 cooking scenario. The above △T11 corresponds to the absolute value of the difference between the maximum temperature at the front side of the first air deflector and the maximum temperature at the front side of the second air deflector. At this time, it is necessary to control the first air deflector to deflect relative to the cabinet; when the temperature at the front side of the first air deflector is lower than the temperature at the front side of the second air deflector, and △T11 > T5, that is, it corresponds to the Figure 6 cooking scenario. At this time, it is necessary to control the second air deflector to deflect relative to the cabinet; when △T11 ≤ T5, it corresponds to the Figure 7 cooking scenario. At this time, the first air deflector and the second air deflector remain in the initial position, and this initial position corresponds to the default position where the first air deflector and the second air deflector are located.

[0080] In this embodiment, the optical fiber is installed near the air inlet, so that it can automatically adapt to different user cooking environments such as installation height and pot diameter, improve the temperature measurement stability, and further realize the early judgment and dynamic control of the air volume change of the range hood according to the temperature change and the left-right trend distribution, solve the problem that the ordinary oil fume sensor and temperature sensor predict the smoke and adjust the air volume with a lag, improve the oil fume extraction effect, and intelligently adapt to the user's cooking operation.

[0081] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An oil fume extractor, comprising: A casing (1) with an air inlet (10) provided on its front side; It is characterized by further comprising: A transmitting module (2), including a transmitter (21) for transmitting pulsed light; A detection module (3), including an optical fiber (31) and a detector (32), the optical fiber (31) is arranged adjacent to the air inlet (10), and the pulsed light emitted by the transmitter (21) propagates along the extending direction of the optical fiber (31), and the detector (32) is used to receive the Raman scattering signal generated by the scattering of the pulsed light in the optical fiber (31) to obtain the temperature of each position on the optical fiber (31).

2. The range hood according to claim 1, wherein: The detection module (3) further includes a wavelength division multiplexing unit (33), one end of the wavelength division multiplexing unit (33) is connected to the transmitter (21), the other end of the wavelength division multiplexing unit (33) is connected to the optical fiber (31), and the output end of the wavelength division multiplexing unit (33) is connected to the detector (32).

3. The range hood according to claim 2, wherein: The transmitting module (2) further includes a driving module (22) electrically connected to the transmitter (21), the detection module (3) further includes a signal processing module (34) electrically connected to the detector (32), and the signal processing module (34) is electrically connected to the driving module (22).

4. The range hood according to claim 3, wherein: A controller (4) and a fan (5) electrically connected to the controller (4) are provided in the casing (1), the controller (4) is further electrically connected to the signal processing module (34), and the controller (4) is configured to: correspondingly control the fan (5) according to the result of the signal processing module (34).

5. The range hood according to any one of claims 1 to 4, characterized in that: The optical fiber (31) is arranged along the left - right direction of the casing (1).

6. The range hood according to claim 5, characterized in that: The optical fiber (31) adopts a helical optical fiber.

7. The range hood according to claim 5, characterized in that: A first air deflector (11) and a second air deflector (12) are further provided in the casing (1), distributed one on the left and one on the right behind the air inlet (10), and both the first air deflector (11) and the second air deflector (12) can independently deflect relative to the casing (1) to change the air inlet area at the corresponding position of the air inlet (10).

8. A control method for an oil fume suction machine as described in claim 7 above, characterized in that Including the following steps: Step 1: Start the transmitter to make the transmitter emit pulsed light; Step 2: Receive the Raman scattering signal through the detector to obtain the temperature of each position on the optical fiber; Step 3: Process the temperatures of all positions on the optical fiber obtained in Step 2, and determine whether the current oil fume is normal oil fume or sudden oil fume according to the temperature change result, and make different adjustments to the fan in the oil fume extractor according to different types of the current oil fume.

9. The control method according to claim 8, wherein: The specific control logic for determining whether the current oil fume is normal oil fume or sudden oil fume in Step 3 is: Calculate the temperature gradient of the temperatures of all positions on the optical fiber, and perform temperature mutation detection on the calculated temperature gradient. If the temperature mutation value is lower than the preset value, it is determined that the current oil fume is normal oil fume; if the temperature mutation value exceeds the preset value, it is determined that the current oil fume is sudden oil fume.

10. The control method according to claim 9, wherein: In Step 3, if the current oil fume is normal oil fume, When the duration t of the normal oil fume is lower than the time threshold t1, control the fan in the oil fume extractor to maintain the current gear; When the duration t of the regular cooking fume exceeds the time threshold t1, the temperature difference △T within the duration t of the regular cooking fume is judged. If △T is greater than the first temperature difference threshold T1, the fan speed gear in the range hood is increased; if △T is less than or equal to the first temperature difference threshold T1, the fan in the range hood is controlled to maintain the current gear.

11. The control method according to claim 9, wherein: In step 3, if the current cooking fume is sudden cooking fume, the temperature gradient ▽t is classified as follows: When ▽t < T2, the fan in the range hood is controlled to increase by m gears; When T2 ≤ ▽t < T3, the fan in the range hood is controlled to increase by n gears; When ▽t > T3, the fan speed gear in the range hood is adjusted to the maximum gear J; Wherein T2, T3, m, and n are all preset constants, m < n, and the higher the fan speed gear, the faster the fan speed.

12. The control method according to any one of claims 8 to 11, characterized in that: After step 3, the following steps are further included: Step 4: The optical fiber is arranged along the left - right direction of the machine shell, and the optical fiber is arranged on the front sides of the first air deflector and the second air deflector. The temperature at the front side position of the first air deflector and the temperature at the front side position of the second air deflector are obtained through the optical fiber; Step 5: Calculate the absolute value of the temperature difference △T11 between the front side position of the first air deflector and the front side position of the second air deflector, and make the following judgment and control: If the temperature at the front side position of the first air deflector is higher than the temperature at the front side position of the second air deflector, and △T11 > T5, where T5 is the second temperature difference threshold, the first air deflector is deflected relative to the machine shell to increase the air inlet area at the corresponding position of the first air deflector, and the second air deflector continues to be in the initial position; If the temperature at the front side position of the first air deflector is lower than the temperature at the front side position of the second air deflector, and △T11 > T5, the second air deflector is deflected relative to the machine shell to increase the air inlet area at the corresponding position of the second air deflector, and the first air deflector continues to be in the initial position; If △T11 ≤ T5, the first air deflector and the second air deflector continue to be in the initial position.

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