Control method of range hood and range hood

Abstract

The invention relates to a control method of a range hood and the range hood, and the control method of the range hood comprises the steps that the range hood is started, a draught fan of the range hood has M working gears, each working gear has N air volume values which are sequentially arranged from small to large, and at least two adjacent working gears have the same or similar air volume values; the current oil smoke concentration P and the oil smoke escape speed Q are obtained, if the oil smoke concentration P is larger than or equal to the oil smoke threshold value, and the oil smoke escape speed Q is larger than or equal to the oil smoke escape speed threshold value, the influence degree Y1 of the oil smoke concentration P and the influence degree Y2 of the oil smoke escape speed Q are calculated, and the working gear and the air volume value of a draught fan of the extractor hood are adjusted according to the comparison result of Y1 and Y2. The method has the advantages that the user does not need to judge and operate, the hysteresis of user operation is avoided, the situation that the user possibly judges and operates mistakenly is also avoided, the cooking experience of the user is greatly improved, and the body health of the user is also ensured.

Description

Technical Field

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

[0002] A range hood is a kitchen product for purifying the kitchen environment. The range hood works based on the principle of fluid dynamics, and sucks and discharges oil fume through a fan installed inside the range hood. The fan includes a volute, an impeller installed in the volute, and a motor that drives the impeller to rotate. When the impeller rotates, a negative pressure suction is generated at the center of the fan, sucking the oil fume below the range hood into the fan, and after being accelerated by the fan, it is collected by the volute and guided out of the room.

[0003] During the user's cooking process, there is often a situation where the oil fume suddenly increases. Due to the mismatch between the fan speed and the stove firepower, the oil fume cannot be discharged smoothly and fills the kitchen, causing harm to the user's physical and mental health and affecting the cooking experience. Usually, the user can only manually increase the fan speed or reduce the stove firepower. However, due to the obvious lag of the manual adjustment method, when the oil fume spreads, the user often realizes that they need to adjust the range hood or the stove, which not only affects the user's cooking experience but also affects the user's physical and mental health. In addition, the user generally chooses to increase the air volume or reduce the firepower, but the user does not know the reason for the oil fume spread, and the countermeasures taken are random, sometimes resulting in the opposite effect. For example, when the oil fume spreads, the correct approach is to increase the air volume of the range hood, but the user chooses to reduce the stove firepower, which may affect the cooking of the dish at this time.

[0004] To solve the above technical problems, a Chinese invention patent with the application number CN202211716340.5 (publication number CN116336523A) discloses a control method, device, range hood and storage medium for a range hood. The method includes: calling an oil fume sensor to detect the real-time concentration value of the oil fume in the environment where the range hood is located; setting multiple gears for the fan used to extract the oil fume, and each gear maps to an original concentration range; adjusting the original concentration range to a candidate concentration range adapted to the degree of contamination of the oil fume sensor; and adjusting the gear of the fan according to the relationship between the real-time concentration value and the candidate concentration range.

[0005] Although the above control method can adjust the gear of the fan according to the real-time concentration value of the oil fume, the above control method has the following limitations in use: Since the oil fume spread may be caused by various factors, however, the above control method only adjusts the gear of the fan according to the concentration value of the oil fume, thus unable to match a suitable oil fume suppression and removal method, and further resulting in limited oil fume extraction effect. Therefore, it is necessary to further improve the existing technology. Summary of the Invention

[0006] The first technical problem to be solved by the present invention is directed to the above-mentioned prior art, and provides a control method for a range hood that can improve the oil fume extraction effect.

[0007] The second technical problem to be solved by the present invention is to provide a range hood applying the above control method.

[0008] The technical solution adopted by the present invention to solve the above first technical problem is as follows: A control method for a range hood, characterized by comprising the following steps:

[0009] Step 1: Start the range hood. The range hood includes a fan, and the fan has M working gears. Each working gear has N air volume values arranged in ascending order from small to large. Both M and N are positive integers, and at least two adjacent working gears have the same or similar air volume values;

[0010] Step 2: Obtain the current oil fume concentration P and the oil fume escape speed Q;

[0011] Step 3: Compare the oil fume concentration P with the oil fume threshold, and compare the oil fume escape speed Q with the oil fume escape speed threshold. If the oil fume concentration P is greater than or equal to the oil fume threshold, and the oil fume escape speed Q is greater than or equal to the oil fume escape speed threshold, then proceed to Step 4;

[0012] Step 4: Calculate the influence degree Y1 of the oil fume concentration P and the influence degree Y2 of the oil fume escape speed Q, and determine whether Y1 is greater than or equal to Y2. If so, proceed to Step 5; if not, proceed to Step 7;

[0013] Step 5: Calculate the relative difference ΔY according to the following formula 12 , ΔY 12 The calculation formula of is:

[0014]

[0015] Judge whether ΔY 12 is greater than or equal to the set threshold Y y , if so, proceed to Step 6; if not, control the fan to maintain the current working gear unchanged, and control the air volume value of the fan to increase. After waiting for the set time, proceed to Step 2;

[0016] Step 6: Determine whether the current working gear i of the fan is less than the set gear m, i ∈ [1, M]. If so, increase the working gear of the fan of the current range hood, and control the air volume value of the fan to increase. After waiting for the set time, proceed to Step 2; if not, control the fire power value of the cooker to decrease. After waiting for the set time, proceed to Step 2;

[0017] Step 7: Determine whether the working gear i of the current fan is greater than or equal to 2. If so, reduce the working gear of the fan of the current range hood and control the air volume value of the fan to increase. After waiting for the set time, go to Step 2; if not, control the firepower value of the cooker to decrease. After waiting for the set time, go to Step 2.

[0018] Preferably, the following control logic is further included in Step 3:

[0019] If the oil fume concentration P is greater than or equal to the oil fume threshold value and the oil fume escape speed Q is less than the oil fume escape speed threshold value, then go to Step 3-1;

[0020] Step 3-1: Calculate the difference ΔY1 between the influence degree Y1 of the oil fume concentration P and the oil fume concentration influence degree threshold value Y 11 ΔY1 = |Y1 - Y 11 |;

[0021] Step 3-2: Determine whether ΔY1 is greater than 0. If so, control the fan to maintain the current working gear unchanged and control the air volume value of the fan to increase. After waiting for the set time, go to Step 2; if not, go to Step 3-3;

[0022] Step 3-3: Execute Step 7.

[0023] Further preferably, the following control logic is further included in Step 3:

[0024] If the oil fume concentration P is less than the oil fume threshold value and the oil fume escape speed Q is greater than or equal to the oil fume escape speed threshold value, then execute Step 6.

[0025] Further preferably, the following control logic is further included in Step 3:

[0026] If the oil fume concentration P is less than the oil fume threshold value and the oil fume escape speed Q is less than the oil fume escape speed threshold value, then go to Step 3-a;

[0027] Step 3-a: Calculate the influence degree Y1 of the oil fume concentration P and the influence degree Y2 of the oil fume escape speed Q, and determine whether Y1 is greater than or equal to Y2. If so, go to Step 3-b; if not, execute Step 7;

[0028] Step 3-b: Calculate the relative difference ΔY according to the following formula 12 , ΔY 12 The calculation formula of is:

[0029]

[0030] Determine whether ΔY 12 is greater than or equal to the set threshold value Y y, if so, increase the working gear of the fan of the current range hood and control the air volume value of the fan to increase, and transfer to step 2 after waiting for the set time; if not, control the fan to maintain the current working gear unchanged, and control the air volume value of the fan to increase, and transfer to step 2 after waiting for the set time.

[0031] Specifically, the calculation formula of Y1 in step 4 is:

[0032]

[0033] where P 限 is the set limit value of oil fume concentration.

[0034] Specifically, the calculation formula of Y2 in step 4 is:

[0035]

[0036] where Q 限 is the set limit value of oil fume escape speed.

[0037] The technical solution adopted by the present invention to solve the above second technical problem is: a range hood, characterized in that: the control method as described above is applied.

[0038] Preferably, the range hood includes a casing with an air inlet, and a smoke concentration detector for detecting the oil fume concentration is arranged at the air inlet of the casing.

[0039] Preferably, a speed recognition camera capable of detecting the oil fume escape speed is provided on the casing.

[0040] Compared with the prior art, the advantages of the present invention are: by obtaining the oil fume concentration and the oil fume escape speed, and analyzing the oil fume concentration and the oil fume escape speed therein, by judging the relationship between the influence degree of the oil fume concentration and the influence degree of the oil fume escape speed, the correct oil fume suppression and removal method is determined and implemented in time, improving the oil fume extraction effect and the cooking experience of users. Therefore, this method does not require users to judge and operate, avoiding the lag of user operation, and at the same time avoiding the situation where users may make wrong judgments and wrong operations, greatly improving the cooking experience of users and ensuring the physical health of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a flowchart of the control method of the range hood in the embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0042] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0043] Such as Figure 1As shown in the figure, the control method of the range hood in this embodiment includes the following steps:

[0044] Step 1: Start the range hood. The range hood includes a fan, and the fan has M working gears. Each working gear has N air volume values arranged in ascending order from small to large. Both M and N are positive integers, and at least two adjacent working gears have the same or similar air volume values.

[0045] The higher the working gear of the fan, the greater the maximum air volume value when the fan is working. At least two adjacent working gears have the same or similar air volume values. For example, the jth air volume value at the ith working gear, the (j - 1)th air volume value at the (i + 1)th working gear, and the (j + 1)th air volume value at the (i - 1)th working gear are the same or similar (i.e., the error is close to 0). However, the current and the fan speed at these three working gears are not the same. Therefore, when adjusting the air volume, it will be determined according to two indicators: the influence degree of the oil fume concentration and the influence degree of the oil fume escape speed, so that the range hood works under the most suitable working conditions.

[0046] Step 2: Obtain the current oil fume concentration P and the oil fume escape speed Q.

[0047] Step 3: Compare the oil fume concentration P with the oil fume threshold, and compare the oil fume escape speed Q with the oil fume escape speed threshold. If the oil fume concentration P is greater than or equal to the oil fume threshold, and the oil fume escape speed Q is greater than or equal to the oil fume escape speed threshold, then go to Step 4.

[0048] In this embodiment, the specific values of the oil fume threshold and the oil fume escape speed threshold are both confirmed according to experiments or experience.

[0049] Step 4: Calculate the influence degree Y1 of the oil fume concentration P and the influence degree Y2 of the oil fume escape speed Q, and determine whether Y1 is greater than or equal to Y2. If so, go to Step 5; if not, go to Step 7.

[0050] In this embodiment, the calculation formula of Y1 is:

[0051]

[0052] where P 限 is the set oil fume concentration limit value;

[0053] The calculation formula of Y2 is:

[0054]

[0055] where Q 限 is the set oil fume escape speed limit value; P 限 and Q 限 in this embodiment are determined according to a large number of experimental results.

[0056] Step 5: Calculate the relative difference ΔY according to the following formula 12 , ΔY 12 The calculation formula of is as follows:

[0057]

[0058] Judge whether ΔY 12 is greater than or equal to the set threshold Y y , if so, go to Step 6; if not, control the fan to maintain the current working gear unchanged, and control the air volume value of the fan to increase, and then go to Step 2 after waiting for the set time;

[0059] In this embodiment, the set threshold Y y is determined according to experimental confirmation or empirical confirmation;

[0060] Step 6: Judge whether the working gear i of the current fan is less than the set gear m, i ∈ [1, M]. If so, increase the working gear of the fan of the current range hood and control the air volume value of the fan to increase, and then go to Step 2 after waiting for the set time; if not, control the firepower value of the cooker to decrease, and then go to Step 2 after waiting for the set time;

[0061] In this embodiment, the set gear m is determined according to experimental confirmation or empirical confirmation;

[0062] Step 7: Judge whether the working gear i of the current fan is greater than or equal to 2. If so, decrease the working gear of the fan of the current range hood and control the air volume value of the fan to increase, and then go to Step 2 after waiting for the set time; if not, control the firepower value of the cooker to decrease, and then go to Step 2 after waiting for the set time.

[0063] The above set time is determined according to experimental confirmation or empirical confirmation.

[0064] The following control logic is further included in the above Step 3:

[0065] If the oil fume concentration P is greater than or equal to the oil fume threshold, and the oil fume escape speed Q is less than the oil fume escape speed threshold, then go to Step 3-1;

[0066] Step 3-1: Calculate the difference ΔY1 between the influence degree Y1 of the oil fume concentration P and the oil fume concentration influence degree threshold Y 11 , ΔY1 = |Y1 - Y 11 |; the oil fume concentration influence degree threshold Y 11 in this embodiment is determined according to experimental confirmation or empirical confirmation;

[0067] Step 3-2: Determine whether ΔY1 is greater than 0. If so, control the fan to maintain the current working gear and increase the air volume value of the fan. After waiting for the set time, transfer to Step 2. If not, transfer to Step 3-3;

[0068] Step 3-3: Execute Step 7.

[0069] If the oil fume concentration P is less than the oil fume threshold value and the oil fume escape velocity Q is greater than or equal to the oil fume escape velocity threshold value, then execute Step 6.

[0070] If the oil fume concentration P is less than the oil fume threshold value and the oil fume escape velocity Q is less than the oil fume escape velocity threshold value, then transfer to Step 3-a;

[0071] Step 3-a: Calculate the influence degree Y1 of the oil fume concentration P and the influence degree Y2 of the oil fume escape velocity Q, and determine whether Y1 is greater than or equal to Y2. If so, transfer to Step 3-b; if not, execute Step 7;

[0072] Step 3-b: Calculate the relative difference ΔY according to the following formula 12 , ΔY 12 The calculation formula of is:

[0073]

[0074] Determine whether ΔY 12 is greater than or equal to the set threshold value Y y , if so, increase the working gear of the fan of the current range hood and control the air volume value of the fan to increase. After waiting for the set time, transfer to Step 2; if not, control the fan to maintain the current working gear and control the air volume value of the fan to increase. After waiting for the set time, transfer to Step 2.

[0075] This embodiment also relates to a range hood to which the above control method is applied.

[0076] The range hood includes a casing having an air inlet, and a smoke concentration detector for detecting the oil fume concentration is provided at the air inlet of the casing; a speed recognition camera capable of detecting the oil fume escape velocity is provided on the casing.

[0077] As is well known, from the generation of cooking fumes to their absorption by the range hood, the fumes will pass through three regions successively, which are the cooking fume generation region, the cooking fume rising region, and the cooking fume diffusion region from bottom to top. The function of the range hood is to inhale the cooking fumes into the cavity and discharge them from the flue before the fumes enter the diffusion region. When the rising speed of the cooking fumes is too fast and the negative pressure generated by the range hood is not enough to deal with the fumes in time, there is a risk of fume diffusion. Therefore, the speed recognition camera collects the escape speed of the cooking fumes at the interface between the cooking fume rising region and the cooking fume diffusion region. The measurement method of the cooking fume escape speed is as follows: The speed recognition camera calibrates N small cooking fume regions, records the initial positions of each small cooking fume region at time t1, and records the final positions of each small cooking fume region at time t2. Δt = t2 - t1 is extremely small. Divide the distance between the final position and the initial position of each small cooking fume region by the movement time Δt, and the escape speed of the cooking fumes in this region can be obtained (Q1, Q2, ……, Q N-1 , Q N ). Perform an average processing on the N escape speeds to obtain the escape speed Q of the cooking fumes at this interface.

[0078] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, 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. A control method for a range hood, characterized in that The steps include: Step 1, starting the range hood, the range hood comprising a fan, the fan having M working gears, each working gear having N air volume values ​​arranged in order from small to large, M and N being positive integers, and at least two adjacent working gears having the same or similar air volume values; Step 2, obtaining the current oil fume concentration P and oil fume escape velocity Q; Step 3: compare the oil fume concentration P with the oil fume threshold, and compare the oil fume escape velocity Q with the oil fume escape velocity threshold. If the oil fume concentration P is greater than or equal to the oil fume threshold, and the oil fume escape velocity Q is greater than or equal to the oil fume escape velocity threshold, proceed to step 4. Step 4, calculate the influence degree Y1 of the oil fume concentration P and the influence degree Y2 of the oil fume escape velocity Q, and determine whether Y1 is greater than or equal to Y2. If so, proceed to step 5; if not, proceed to step 7; Step 5: Calculate the relative difference ΔY according to the following formula: 12 , ΔY 12 The calculation formula is: Determine ΔY 12 Is it greater than or equal to the set threshold Y y If yes, go to step 6; if no, control the fan to maintain the current working gear unchanged, and control the fan air volume value to increase, wait for the set time and go to step 2; Step 6, determine whether the current fan working gear i is less than the set gear m, i∈[1,M], if yes, increase the fan working gear of the current range hood, and control the fan air volume value to increase, wait for the set time and then go to step 2; if no, control the stove fire value to decrease, wait for the set time and then go to step 2; Step 7, determine whether the current fan working gear i is greater than or equal to 2. If so, reduce the current range hood fan working gear, and control the fan air volume value to increase, wait for the set time and then proceed to step 2; if not, control the stove firepower value to decrease, wait for the set time and then proceed to step 2.

2. The control method according to claim 1, characterized in that: The step 3 also includes the following control logic: If the oil fume concentration P is greater than or equal to the oil fume threshold, and the oil fume escape velocity Q is less than the oil fume escape velocity threshold, proceed to step 3-1; Step 3-1: Calculate the influence degree Y1 of the fume concentration P and the threshold value Y of the fume concentration influence degree 11 The difference ΔY1, ΔY1 = |Y1-Y 11 |; Step 3-2, determine whether ΔY1 is greater than 0. If so, control the fan to maintain the current working gear unchanged, and control the fan air volume value to increase, and wait for the set time before going to step 2; if not, go to step 3-3; Step 3-3, proceed to step 7.

3. The control method according to claim 1, characterized in that: The step 3 also includes the following control logic: If the oil fume concentration P is less than the oil fume threshold, and the oil fume escape velocity Q is greater than or equal to the oil fume escape velocity threshold, execute step 6.

4. The control method according to claim 1, characterized in that: The step 3 also includes the following control logic: If the oil fume concentration P is less than the oil fume threshold, and the oil fume escape velocity Q is less than the oil fume escape velocity threshold, proceed to step 3-a; Step 3-a, calculate the influence degree Y1 of the oil fume concentration P and the influence degree Y2 of the oil fume escape velocity Q, and determine whether Y1 is greater than or equal to Y2. If so, proceed to step 3-b; if not, proceed to step 7; Step 3-b: Calculate the relative difference ΔY according to the following formula: 12 , ΔY 12 The calculation formula is: Determine ΔY 12 Is it greater than or equal to the set threshold Y y If yes, then increase the current range hood fan operating gear, and control the fan's air volume value to increase, wait for the set time and then proceed to step 2; if no, control the fan to maintain the current operating gear unchanged, and control the fan's air volume value to increase, wait for the set time and then proceed to step 2.

5. The control method according to any one of claims 1 to 4, characterized in that: The calculation formula of Y1 in step 4 is: Among them, P 限 is the set oil fume concentration limit value.

6. The control method according to any one of claims 1 to 4, characterized in that: The calculation formula of Y2 in step 4 is: Among them, Q 限 is the set oil smoke escape velocity limit value.

7. A range hood, characterized in that: The control method as described in any one of claims 1 to 6 is applied.

8. The range hood according to claim 7, characterized in that: The range hood comprises a casing with an air inlet, and a smoke concentration detector for detecting the concentration of oil smoke is arranged at the air inlet of the casing.

9. The range hood according to claim 8, characterized in that: The casing is provided with a speed recognition camera which can be used to detect the escape speed of oil smoke.

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