A range hood and a control method thereof

Abstract

The application relates to an oil fume extractor and a control method thereof, wherein the oil fume extractor comprises a casing with an oil fume channel; characterized in that the oil fume extractor further comprises a humidity detection module, an oil fume detection module and a controller; the humidity detection module comprises a first humidity detection unit and a second humidity detection unit; one of the first humidity detection unit and the second humidity detection unit is arranged outside the casing, and the other is arranged in the oil fume channel; the oil fume detection module is arranged in the oil fume channel; the controller is electrically connected with the humidity detection module and the oil fume detection module; the controller is configured to analyze the detection results of the humidity detection module and the oil fume detection module, and obtain the water vapor and oil fume conditions in the oil fume channel. The oil fume extractor has the advantages that the humidity detection module and the oil fume detection module can distinguish the water vapor and the oil fume in the oil fume channel together, thereby realizing the identification of different cooking scenes, changing the gear of the fan according to the different cooking scenes, and improving the use experience of the user.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil fume purification, and in particular to an extractor hood and a control method thereof. BACKGROUND

[0002] The extractor hood is an essential kitchen appliance for every family. It absorbs oil fume from the air inlet through the high-speed rotating impeller in the volute, filters the oil fume with the impeller, and discharges the filtered oil fume from the air outlet, thereby completing the purification of the kitchen air.

[0003] The fan of the traditional extractor hood operates at a fixed gear or speed. The user manually selects the required gear according to different scenarios such as stir-frying and steaming. However, the user usually has multiple different types of cooking actions in the cooking area, which will affect the smoke generation in the cooking area, such as pot-stir-frying, serving dishes, and large instantaneous oil fume or steam when the pot cover is lifted. The traditional extractor hood with fixed gear or speed operation cannot adapt to such sudden scenarios.

[0004] To solve this technical problem, a Chinese patent with the patent number ZL201911272109.X (the authorized announcement number CN110848781B) discloses an extractor hood, which includes a fan, a fan driving assembly for driving the fan to work, a smoke collecting cavity arranged on the smoke inlet, a particulate matter sensor for collecting the particulate matter concentration in the oil fume at preset time intervals, and a controller. The controller is used to receive the particulate matter concentration collected by the particulate matter sensor at preset time intervals. Although the extractor hood can select the corresponding cooking mode according to the particulate matter concentration, the extractor hood has the following use limitations: Since the above-mentioned extractor hood detects the particulate matter concentration in the oil fume, this detection method cannot distinguish between water vapor and oil fume, resulting in inaccurate cooking scenario judgment. Therefore, further improvement is needed for the prior art. SUMMARY

[0005] The first technical problem to be solved by the present application is to provide an extractor hood that can distinguish between water vapor and oil fume in the oil fume passage.

[0006] The second technical problem to be solved by the present application is to provide a control method for the above-mentioned extractor hood, which can automatically control different cooking scenarios and dynamically adjust the fan gear of the extractor hood.

[0007] The technical solution adopted by the present application to solve the above-mentioned first technical problem is an extractor hood, which includes:

[0008] A housing having an oil fume passage;

[0009] characterized in that it further comprises:

[0010] The humidity detection module comprises a first humidity detection unit and a second humidity detection unit, one of which is arranged outside the casing and the other of which is arranged in the oil fume channel.

[0011] The oil fume detection module is arranged in the oil fume channel.

[0012] The controller is electrically connected with the humidity detection module and the oil fume detection module, and is configured to analyze the detection results of the humidity detection module and the oil fume detection module to obtain the humidity and the oil fume amount in the oil fume channel.

[0013] In order to reduce the influence of cooking on the environmental humidity detection, the first humidity detection unit is arranged outside the casing and is arranged away from the entrance of the oil fume channel.

[0014] Preferably, the second humidity detection unit is arranged in the oil fume channel and is installed adjacent to the oil fume detection module.

[0015] Preferably, the second humidity detection unit and the oil fume detection module are arranged in front of and behind the oil fume flow path.

[0016] Preferably, the first humidity detection unit and the second humidity detection unit both adopt humidity sensors.

[0017] Preferably, the oil fume detection module adopts an oil fume sensor.

[0018] The present application solves the second technical problem by adopting the technical scheme of a control method for the above-mentioned range hood, characterized by comprising the following steps:

[0019] Step 1: obtaining the humidity value S1 detected by the first humidity detection unit, the humidity value S2 detected by the second humidity detection unit and the oil fume amount Y detected by the oil fume detection module, and calculating the humidity difference ΔS=S2-S1.

[0020] Step 2: judging whether the oil fume amount Y detected by the oil fume detection module is less than the first oil fume amount threshold Ya, if yes, there is basically no oil fume in the oil fume channel, and the process proceeds to step 3; if no, the process proceeds to step 6.

[0021] Step 3: judging whether the humidity difference ΔS is greater than the humidity difference threshold Sb, if yes, the process proceeds to step 4; if no, there is basically no water vapor in the oil fume channel, the fan is turned off, and the process proceeds to step 5.

[0022] Step 4, judging whether the humidity value S1 detected by the first humidity detection unit is less than the humidity threshold value Sa, if yes, switching or maintaining the fan in the machine shell to the low gear, and turning to step 5; if no, switching or maintaining the fan in the machine shell to the high gear, and turning to step 5.

[0023] Step 5, waiting for a set time, and then turning to step 1 again;

[0024] Step 6, judging whether the oil fume amount Y detected by the oil fume detection module is greater than or equal to the first oil fume amount threshold value Ya and less than the second oil fume amount threshold value Yb, if yes, distinguishing the oil fume and the water vapor in the oil fume channel; if no, switching or maintaining the fan in the machine shell to the high gear, and turning to step 5.

[0025] Preferably, the specific process of distinguishing the oil fume and the water vapor in the oil fume channel in step 6 is as follows:

[0026] Step a, judging whether the humidity difference ΔS is less than the humidity difference threshold value Sb, if yes, determining that the current oil fume channel is dominated by oil fume, and switching or maintaining the fan in the machine shell to the high gear, and turning to step 5; if no, determining that the current oil fume channel is dominated by water vapor, and switching or maintaining the fan in the machine shell to the low gear, and turning to step 5.

[0027] Further, if the humidity difference ΔS is less than or equal to the humidity difference threshold value Sb in step 3, the controller determines that the current cooking appliance is in a non-working cooking scene.

[0028] Further, if the humidity difference ΔS is greater than the humidity difference threshold value Sb in steps 3 and a, the controller determines that the current cooking appliance is in a steaming cooking scene.

[0029] Further, if the oil fume amount Y detected by the oil fume detection module is greater than or equal to the second oil fume amount threshold value Yb in step 6, or if the humidity difference ΔS is less than the humidity difference threshold value Sb in step a, the controller determines that the current cooking appliance is in a stir-frying cooking scene.

[0030] Compared with the prior art, the advantages of the present application are as follows: on the one hand, by arranging two humidity detection units, one of which is arranged outside the casing and the other of which is arranged in the oil fume channel, the water vapor in the oil fume channel can be distinguished by combining the detection results of the two humidity detection units; in addition, the oil fume detection module is arranged in the oil fume channel, so that the water vapor and the oil fume in the oil fume channel can be distinguished by the humidity detection module and the oil fume detection module together, thereby the recognition of different cooking scenes can be realized, and then the gear of the fan can be changed according to the different cooking scenes, thereby the user experience is improved. On the other hand, the humidity detection unit arranged outside the casing can judge the environmental humidity, and the fan speed can be adjusted according to the environmental humidity, thereby preventing the water vapor from condensing on the panel or the oil screen to form water droplets falling into the pot. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a use schematic diagram of the range hood in the embodiment of the present application;

[0032] Figure 2 is a working principle diagram of the range hood in the embodiment of the present application;

[0033] Figure 3 is a flow chart of the control method of the range hood in the embodiment of the present application. DETAILED DESCRIPTION

[0034] The present application will be further described in detail below with reference to the embodiments of the drawings.

[0035] As shown in the drawings, Figure 1 The range hood in the embodiment of the present application includes a casing 1 and a fan, the casing 1 has an oil fume channel 10, and the fan is arranged in the oil fume channel 10. The fan adopts the prior art, which will not be described here. The range hood is provided below with a cooking appliance a.

[0036] As shown in the drawings, Figure 1 and Figure 2 The range hood in the embodiment of the present application further includes a humidity detection module 2, an oil fume detection module 3 and a controller 4, the humidity detection module 2 includes a first humidity detection unit 21 and a second humidity detection unit 22, one of the first humidity detection unit 21 and the second humidity detection unit 22 is arranged outside the casing 1, and the other is arranged in the oil fume channel 10; the oil fume detection module 3 is arranged in the oil fume channel 10; the controller 4 is electrically connected with the humidity detection module 2 and the oil fume detection module 3, and the controller 4 is configured to analyze the detection results of the humidity detection module 2 and the oil fume detection module 3 to obtain the humidity and the oil fume amount in the oil fume channel 10. The controller 4 is further connected with a fan driving module 5 and a switch module 6, the controller 4 changes the gear of the fan by controlling the fan driving module 5, and the switch module 6 is mainly used for operating the controller 4.

[0037] AsFigure 1 As shown, the first humidity detection unit 21 in the embodiment is arranged outside the casing 1, and the first humidity detection unit 21 is arranged away from the entrance of the oil fume channel 10; the second humidity detection unit 22 is arranged inside the oil fume channel 10, and is arranged adjacent to the oil fume detection module 3. In addition, the second humidity detection unit 22 and the oil fume detection module 3 are arranged in front of and behind the oil fume flow path. The first humidity detection unit 21 and the second humidity detection unit 22 in the embodiment both adopt humidity sensors, and the oil fume detection module 3 adopts an oil fume sensor.

[0038] As shown, the control method of the range hood in the embodiment further includes the following steps: Figure 3

[0039] Step 1: respectively acquire the humidity value S1 detected by the first humidity detection unit, the humidity value S2 detected by the second humidity detection unit, and the oil fume amount Y detected by the oil fume detection module, and calculate the humidity difference ΔS = S2-S1;

[0040] The embodiment further includes controlling whether the range hood is started in a manual operation or a smart mode before Step 1, if the smart mode is started, then the smart monitoring mode is started, and Step 1 is entered;

[0041] Step 2: judge whether the oil fume amount Y detected by the oil fume detection module is less than a first oil fume amount threshold Ya, if yes, then there is basically no oil fume in the oil fume channel, and Step 3 is entered; if no, then Step 6 is entered;

[0042] Step 3: judge whether the humidity difference ΔS is greater than a humidity difference threshold Sb, if yes, then Step 4 is entered; if no, then there is basically no water vapor in the oil fume channel, the fan in the casing is turned off, and Step 5 is entered;

[0043] Step 4: judge whether the humidity value S1 detected by the first humidity detection unit is less than a humidity threshold Sa, if yes, then the fan in the casing is switched to a low gear or maintained at a low gear, and Step 5 is entered; if no, then the fan in the casing is switched to a high gear or maintained at a high gear, and Step 5 is entered;

[0044] The fan in the embodiment has at least two gears, and the higher the gear, the higher the rotating speed of the fan. The above-mentioned low gear and high gear are both relative to the gear of the current fan;

[0045] Step 5: wait for a set time, and then Step 1 is entered again;

[0046] ​Step 6, judging whether the oil fume amount Y detected by the oil fume detection module is greater than or equal to the first oil fume amount threshold Ya and less than the second oil fume amount threshold Yb, if yes, distinguishing the oil fume and the water vapor in the oil fume channel, if no, switching the fan in the machine shell to a high gear or maintaining the high gear, and entering step 5.

[0047] The specific process of distinguishing the oil fume and the water vapor in the oil fume channel in step 6 is as follows:

[0048] Step a, judging whether the humidity difference ΔS is less than the humidity difference threshold Sb, if yes, determining that the current oil fume channel is dominated by oil fume, and switching the fan in the machine shell to a high gear or maintaining the high gear, and entering step 5, if no, determining that the current oil fume channel is dominated by water vapor, and switching the fan in the machine shell to a low gear or maintaining the low gear, and entering step 5.

[0049] The first oil fume amount threshold Ya, the humidity difference threshold Sb, the humidity threshold Sa and the second oil fume amount threshold Yb in the embodiment are obtained through experiments or experience confirmation;

[0050] In step 3 above, if the humidity difference ΔS is less than or equal to the humidity difference threshold Sb, the controller determines that the current stove is in a non-working cooking scene; in steps 3 and a above, if the humidity difference ΔS is greater than the humidity difference threshold Sb, the controller determines that the current stove is in a steaming cooking scene; in step 6 above, if the oil fume amount Y detected by the oil fume detection module is greater than or equal to the second oil fume amount threshold Yb, or in step a, if the humidity difference ΔS is less than the humidity difference threshold Sb, the controller determines that the current stove is in a stir-frying cooking scene.

[0051] In the present application, the first humidity detection unit 21 and the second humidity detection unit 22 can improve the judgment ability of water vapor, and the first humidity detection unit 21 can detect the environmental humidity to judge the evaporation capacity of water vapor condensation on the oil screen or the panel, and determine whether to open a larger air volume to improve the evaporation capacity, so as to prevent water droplets from falling into the pot due to water vapor condensation on the panel or the oil screen.

[0052] The above only describes the preferred embodiments of the present application, and it should be pointed out that those skilled in the art can make some improvements and refinements without departing from the technical principles of the present application, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A range hood, comprising: The casing (1) has an oil fume duct (10); Its features also include: The humidity detection module (2) includes a first humidity detection unit (21) and a second humidity detection unit (22). One of the first humidity detection unit (21) and the second humidity detection unit (22) is located outside the casing (1), and the other is located inside the fume duct (10). The fume detection module (3) is located inside the fume channel (10); The controller (4) is electrically connected to the humidity detection module (2) and the oil fume detection module (3). The controller (4) is configured to analyze the detection results of the humidity detection module (2) and the oil fume detection module (3) to obtain the humidity and oil fume amount in the oil fume channel (10).

2. The range hood according to claim 1, characterized in that: The first humidity detection unit (21) is located outside the housing (1) and is located away from the entrance of the fume duct (10).

3. The range hood according to claim 2, characterized in that: The second humidity detection unit (22) is located in the fume channel (10) and installed adjacent to the fume detection module (3).

4. The range hood according to claim 3, characterized in that: The second humidity detection unit (22) and the oil fume detection module (3) are set one after the other along the oil fume flow path.

5. The range hood according to any one of claims 1 to 4, characterized in that: Both the first humidity detection unit (21) and the second humidity detection unit (22) use humidity sensors.

6. The range hood according to any one of claims 1 to 4, characterized in that: The oil fume detection module (3) uses an oil fume sensor.

7. A control method for a range hood as described in any one of claims 1 to 6, characterized in that... Includes the following steps: Step 1: Obtain the humidity value S1 detected by the first humidity detection unit, the humidity value S2 detected by the second humidity detection unit, and the amount of oil fume Y detected by the oil fume detection module, and calculate the humidity difference ΔS = S2 - S1. Step 2: Determine whether the amount of oil fume Y detected by the oil fume detection module is less than the first oil fume threshold Ya. If yes, there is basically no oil fume in the oil fume channel, and proceed to step 3; otherwise, proceed to step 6. Step 3: Determine whether the humidity difference ΔS is greater than the humidity difference threshold Sb. If yes, proceed to step 4; otherwise, there is basically no water vapor in the fume duct, turn off the fan, and proceed to step 5. Step 4: Determine whether the humidity value S1 detected by the first humidity detection unit is less than the humidity threshold Sa. If yes, switch the fan in the casing to a low setting or maintain a low setting, and proceed to step 5. If no, switch the fan in the casing to a high setting or maintain a high setting, and proceed to step 5. Step 5: After waiting for the set time, proceed to Step 1 again; Step 6: Determine whether the amount of oil fume Y detected by the oil fume detection module is greater than or equal to the first oil fume threshold Ya and less than the second oil fume threshold Yb. If so, distinguish between oil fumes and water vapor in the oil fume channel; if not, switch the fan in the casing to a high position or maintain a high position, and proceed to step 5.

8. The control method according to claim 7, characterized in that: The specific process for distinguishing between oil fumes and water vapor in the fume duct in step 6 is as follows: Step a: Determine whether the humidity difference ΔS is less than the humidity difference threshold Sb. If so, determine that the current fume duct is mainly filled with oil fumes, switch the fan in the casing to a high setting or maintain a high setting, and proceed to step 5. If not, determine that the current fume duct is mainly filled with water vapor, switch the fan in the casing to a low setting or maintain a low setting, and proceed to step 5.

9. The control method according to claim 7 or 8, characterized in that: In step 3, if the humidity difference ΔS is less than or equal to the humidity difference threshold Sb, the controller determines that the current stove is in a non-working cooking scenario.

10. The control method according to claim 8, characterized in that: If the humidity difference ΔS is greater than the humidity difference threshold Sb in steps 3 and a, the controller determines that the current stove is in a steaming or boiling cooking scenario.

11. The control method according to claim 8, characterized in that: In step 6, if the amount of oil fume Y detected by the oil fume detection module is greater than or equal to the second oil fume threshold Yb, or if the humidity difference ΔS in step a is less than the humidity difference threshold Sb, then the controller determines that the current stove is in a stir-fry cooking scenario.

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