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 having an oil smoke channel; the range hood is characterized by further comprising a humidity detection module which 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 machine shell, and the other one of the first humidity detection unit and the second humidity detection unit is arranged in the lampblack channel; the oil smoke detection module is arranged in the oil smoke channel; and the controller is electrically connected with the humidity detection module and the oil smoke detection module, and the controller is configured to be capable of analyzing detection results of the humidity detection module and the oil smoke detection module to obtain water vapor and oil smoke conditions in the oil smoke channel. The range hood has the advantages that water vapor and oil fume in the oil fume channel can be distinguished through the humidity detection module and the oil fume detection module, so that identification of different cooking scenes can be achieved, the gear of the fan is changed according to the different cooking scenes, and the use experience of a user is improved.

Description

Technical Field

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

[0002] As an essential kitchen appliance in every household, the range hood draws in oil fume from the air inlet through the high-speed rotating impeller in the volute, filters the oil fume using the impeller, and discharges the filtered oil fume from the air outlet to purify the kitchen air.

[0003] The fan of a traditional range hood runs at a fixed gear or speed, and the user manually selects the required gear according to different scenarios such as stir-frying, steaming, etc. However, users generally have many different types of cooking actions in the cooking area, which will affect the smoke emission in the cooking area, such as stir-frying, putting vegetables in the pot, and opening the lid, which will generate a lot of oil smoke or water vapor. Traditional range hoods that run at a fixed gear or speed are difficult to adapt to such sudden scenarios.

[0004] To solve this technical problem, a Chinese invention patent with patent number ZL201911272109.X (authorization announcement number CN110848781B) discloses a range hood, including: a fan, a fan drive assembly for driving the fan, a smoke collecting chamber arranged on the smoke inlet, a particle sensor and a controller for collecting the particle concentration in the smoke at preset time intervals; the controller is used to receive the particle concentration collected by the particle sensor at preset time intervals. Although the range hood can select the corresponding cooking mode according to the particle concentration, the range hood has the following limitations: Since the above-mentioned range hood detects the particle concentration in the smoke, this detection method cannot distinguish between water vapor and smoke, resulting in inaccurate judgment of the cooking scene. For this reason, further improvements to the existing technology are needed. Summary of the invention

[0005] The first technical problem to be solved by the present invention is to provide a range hood capable of distinguishing between water vapor and oil smoke in the oil smoke passage in view of the above-mentioned prior art.

[0006] The second technical problem to be solved by the present invention is to provide a control method for the above-mentioned range hood, which can realize automatic control of different cooking scenes and dynamically adjust the fan gear position of the range hood.

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

[0008] A casing having an oil fume passage;

[0009] The invention is characterized in that it also includes:

[0010] The humidity detection module comprises a first humidity detection unit and a second humidity detection unit, wherein one of the first humidity detection unit and the second humidity detection unit is arranged outside the housing, and the other is arranged in the oil fume passage;

[0011] An oil fume detection module is arranged in the oil fume passage;

[0012] The controller is electrically connected to 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 water vapor and oil fume conditions in the oil fume channel.

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

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

[0015] Preferably, the second humidity detection unit and the oil fume detection module are arranged one after the other along the oil fume flow path.

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

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

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

[0019] Step 1, respectively 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 smoke Y detected by the oil smoke detection module, and calculate the humidity difference △S=S2-S1;

[0020] Step 2: determine whether the oil smoke amount Y detected by the oil smoke detection module is less than the first oil smoke amount threshold Ya. If so, there is basically no oil smoke in the oil smoke passage, and the process goes to step 3; if not, the process goes to step 6;

[0021] Step 3: determine whether the humidity difference △S is greater than the humidity difference threshold Sb. If so, proceed to step 4; if not, there is basically no water vapor in the oil fume channel, turn off the fan, and proceed to step 5;

[0022] Step 4, determine whether the humidity value S1 detected by the first humidity detection unit is less than the humidity threshold Sa, if so, switch the fan in the casing to a low gear or maintain the low gear, and proceed to step 5; if not, switch the fan in the casing to a high gear or maintain the high gear, and proceed to step 5;

[0023] Step 5: After waiting for the set time, go to step 1 again;

[0024] Step 6, determine whether the oil smoke amount Y detected by the oil smoke detection module is greater than or equal to the first oil smoke amount threshold Ya and less than the second oil smoke amount threshold Yb. If so, distinguish the oil smoke and water vapor in the oil smoke channel; if not, switch the fan in the casing to a high position or maintain a high position, and proceed to step 5.

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

[0026] Step a, determine whether the humidity difference △S is less than the humidity difference threshold Sb. If so, determine that the current fume duct is mainly composed of fume, and switch the fan in the casing to a high gear or maintain a high gear, and proceed to step 5; if not, determine that the current fume duct is mainly composed of water vapor, and switch the fan in the casing to a low gear or maintain a low gear, and proceed to step 5.

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

[0028] Furthermore, in step 3 and step a, if the humidity difference ΔS is greater than the humidity difference threshold Sb, the controller determines that the current cooker is in a steaming cooking scene.

[0029] Furthermore, in step 6, if the humidity difference ΔS and the oil smoke amount Y detected by the oil smoke detection module are greater than or equal to the second oil smoke amount threshold Yb, or if the humidity difference ΔS is less than the humidity difference threshold Sb in step a, the controller determines that the current stove is in a stir-fry cooking scene.

[0030] Compared with the prior art, the advantages of the present invention are: on the one hand, by setting two humidity detection units, one of which is set outside the casing and the other is set inside the oil fume passage, the water vapor in the oil fume passage can be distinguished by combining the detection results of the two humidity detection units, and the oil fume detection module is set inside the oil fume passage, so the water vapor and oil fume in the oil fume passage can be distinguished by the humidity detection module and the oil fume detection module, so that different cooking scenes can be identified, and then the gear of the fan can be changed according to different cooking scenes, which improves the user's experience. On the other hand, the humidity detection unit outside the casing can be used to judge the ambient humidity, and the fan speed can be adjusted in combination with the ambient humidity to prevent the water vapor from condensing on the panel or the oil net to form water droplets that fall into the pot. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of the use of a range hood according to an embodiment of the present invention;

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

[0033] Figure 3 Flow chart of the range hood control method in an embodiment of the present invention. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below with reference to the accompanying drawings.

[0035] like Figure 1 As shown, the range hood in this embodiment includes a housing 1 and a fan, the housing 1 has a fume passage 10, and the fan is arranged in the fume passage 10. The fan adopts the existing technology and will not be described in detail here. A stove a is arranged below the range hood.

[0036] like Figure 1 and Figure 2 As shown, the range hood in this embodiment 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 housing 1, and the other is arranged in the oil fume passage 10. The oil fume detection module 3 is arranged in the oil fume passage 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 water vapor and oil fume conditions in the oil fume passage 10. The controller 4 is also connected to a fan drive module 5 and a switch module 6. The controller 4 controls the fan drive module 5 to change the gear of the fan. The switch module 6 is mainly used to operate the controller 4.

[0037] like Figure 1 As shown, in this embodiment, the first humidity detection unit 21 is arranged outside the housing 1, and the first humidity detection unit 21 is arranged away from the entrance of the oil fume passage 10; the second humidity detection unit 22 is arranged in the oil fume passage 10, and is installed 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 one after the other along the oil fume flow path. In this embodiment, the first humidity detection unit 21 and the second humidity detection unit 22 both use humidity sensors, and the oil fume detection module 3 uses an oil fume sensor.

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

[0039] Step 1, respectively 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 smoke Y detected by the oil smoke detection module, and calculate the humidity difference △S=S2-S1;

[0040] In this embodiment, before step 1, the method further includes controlling whether the range hood is in manual operation or intelligent mode. If the intelligent mode is turned on, the intelligent monitoring mode is started and the process goes to step 1.

[0041] Step 2: determine whether the oil smoke amount Y detected by the oil smoke detection module is less than the first oil smoke amount threshold Ya. If so, there is basically no oil smoke in the oil smoke passage, and the process goes to step 3; if not, the process goes to step 6;

[0042] Step 3: determine whether the humidity difference △S is greater than the humidity difference threshold Sb. If so, proceed to step 4; if not, there is basically no water vapor in the oil fume channel, turn off the fan, and proceed to step 5;

[0043] Step 4, determine whether the humidity value S1 detected by the first humidity detection unit is less than the humidity threshold Sa, if so, switch the fan in the casing to a low gear or maintain the low gear, and proceed to step 5; if not, switch the fan in the casing to a high gear or maintain the high gear, and proceed to step 5;

[0044] In this embodiment, the fan has at least two gears, and the higher the gear, the higher the speed of the fan. The above low gear and high gear correspond to the current gear of the fan as a reference, and the low and high are relative.

[0045] Step 5: After waiting for the set time, go to step 1 again;

[0046] Step 6, determine whether the oil smoke amount Y detected by the oil smoke detection module is greater than or equal to the first oil smoke amount threshold Ya and less than the second oil smoke amount threshold Yb. If so, distinguish the oil smoke and water vapor in the oil smoke channel; if not, switch the fan in the casing to a high position or maintain a high position, and proceed to step 5.

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

[0048] Step a, determine whether the humidity difference △S is less than the humidity difference threshold Sb. If so, determine that the current fume duct is mainly composed of fume, and switch the fan in the casing to a high gear or maintain a high gear, and proceed to step 5; if not, determine that the current fume duct is mainly composed of water vapor, and switch the fan in the casing to a low gear or maintain a low gear, and proceed to step 5.

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

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

[0051] In the present invention, the first humidity detection unit 21 and the second humidity detection unit 22 can not only improve the ability to judge water vapor, but also the first humidity detection unit 21 can detect the ambient humidity to judge the evaporation capacity of water vapor condensed on the oil net or the panel, and decide whether it is necessary to open a larger air volume to improve the evaporation capacity to prevent water vapor from condensing on the panel or the oil net to form water droplets that fall into the pot.

[0052] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A range hood, comprising: The casing (1) has an oil fume passage (10); The invention is characterized in that it also includes: A humidity detection module (2) comprising a first humidity detection unit (21) and a second humidity detection unit (22), wherein 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 inside the oil fume passage (10); An oil fume detection module (3) is arranged in the oil fume passage (10); A controller (4) is electrically connected to 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 water vapor and oil fume conditions in the oil fume channel (10).

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

3. The range hood according to claim 2, characterized in that: The second humidity detection unit (22) is disposed in the oil fume passage (10) and is installed adjacent to the oil 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 arranged one behind the other along the oil fume flow path.

5. The range hood according to any one of claims 1 to 4, characterized in that: The first humidity detection unit (21) and the second humidity detection unit (22) both 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) adopts an oil fume sensor.

7. A control method for a range hood as claimed in any one of claims 1 to 6, characterized in that The steps include: Step 1, respectively 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 smoke Y detected by the oil smoke detection module, and calculate the humidity difference △S=S2-S1; Step 2: determine whether the oil smoke amount Y detected by the oil smoke detection module is less than the first oil smoke amount threshold Ya. If so, there is basically no oil smoke in the oil smoke passage, and the process goes to step 3; if not, the process goes to step 6; Step 3: determine whether the humidity difference △S is greater than the humidity difference threshold Sb. If so, proceed to step 4; if not, there is basically no water vapor in the oil fume channel, 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 so, switch the fan in the casing to a low gear or maintain the low gear, and proceed to step 5; if not, switch the fan in the casing to a high gear or maintain the high gear, and proceed to step 5; Step 5: After waiting for the set time, go to step 1 again; Step 6, determine whether the oil smoke amount Y detected by the oil smoke detection module is greater than or equal to the first oil smoke amount threshold Ya and less than the second oil smoke amount threshold Yb. If so, distinguish the oil smoke and water vapor in the oil smoke 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 of distinguishing the oil smoke and water vapor in the oil smoke channel in step 6 is as follows: Step a, determine whether the humidity difference △S is less than the humidity difference threshold Sb. If so, determine that the current fume duct is mainly composed of fume, and switch the fan in the casing to a high gear or maintain a high gear, and proceed to step 5; if not, determine that the current fume duct is mainly composed of water vapor, and switch the fan in the casing to a low gear or maintain a low gear, 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 cooker is currently in a non-working cooking scene.

10. The control method according to claim 8, characterized in that: In step 3 and step a, if the humidity difference ΔS is greater than the humidity difference threshold Sb, the controller determines that the current cooker is in a steaming cooking scene.

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

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