A method for controlling a smoke baffle of a range hood and a range hood

Abstract

The present application relates to a kind of fender control method of range hood and range hood, method includes: the installation height h of range hood satisfies: H min ≤h≤H max Then control fender to open to the angle that fender is last used;Obtain the oil fume speed and oil fume concentration data that fender each sensing module is perceived in current state;Calculate the stagnation line in current state, and according to the stagnation line in current state and the stagnation line in standard state, the stagnation line difference curve is obtained;Calculate nominal conversion factor, and when nominal conversion factor r is greater than the threshold r0 of pre-set, judge whether the opening angle of current fender reaches the minimum angle of the start gear of the range hood, if yes, then keep current fender state;If no, then optimize the opening angle of fender, obtain the optimal opening angle of fender;Finally control fender to open to optimal opening angle.The method ensures the performance of whole machine while improving user experience.

Description

Technical Field

[0001] This invention relates to the field of oil fume purification technology, and in particular to a method for controlling the smoke baffle of a range hood and the range hood itself. Background Technology

[0002] A range hood is a kitchen appliance designed to purify the kitchen environment. It works on the principle of fluid dynamics, using a centrifugal fan installed inside to draw in and exhaust cooking fumes. The centrifugal fan consists of a casing, an impeller housed within the casing, and a motor that drives the impeller. As the impeller rotates, a negative pressure is generated at the center of the fan, drawing in the cooking fumes from below. After being accelerated by the fan, the fumes are collected by the casing and guided outwards.

[0003] Existing range hoods typically include a housing with an opening on the front, and a baffle plate that can rotate relative to the housing to close or open the air inlet, as disclosed in Chinese Utility Model Patent No. ZL201921395296.6 (Authorization Announcement No. CN211119558U), entitled "A Side-Suction Range Hood." In the prior art, the opening angle of the baffle plate in existing range hoods is usually fixed, which cannot adapt to varying cooking conditions and differences in installation and usage conditions in different users' homes. This results in inconsistent performance of range hoods used in different homes, reducing the overall smoke extraction efficiency and affecting the user experience.

[0004] Chinese invention patent ZL 202110020502.0 (authorization announcement number CN112963873B), entitled "A Near-Suction Range Hood and a Control Method for the Range Hood," discloses a control method for dynamically adjusting the opening and closing angle of a smoke baffle. After a sensor detection module detects the concentration of oil fumes and / or water vapor on the front side of the housing, the smoke baffle of the range hood, under the action of a first driving mechanism, can open and maintain a certain angle. The opening angle of the smoke baffle matches the oil fume and / or water vapor concentration value detected by the sensor detection module. That is, the smoke baffle of the range hood can dynamically adjust its opening and closing angle according to the oil fume situation (different oil fume and / or water vapor concentrations), thereby effectively improving the smoke extraction effect. Although the above patent can dynamically adjust the opening and closing angle of the smoke baffle according to the amount of oil fumes generated under different cooking conditions, it does not solve the problem of differences caused by different installation positions of the range hood. Therefore, 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 smoke baffle control method for a range hood that can dynamically adjust the opening and closing angle of the smoke baffle based on the installation position and the oil fume situation, thereby improving the oil fume extraction effect.

[0006] The second technical problem to be solved by the present invention is to provide a range hood that applies the above-mentioned smoke baffle control method.

[0007] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: a method for controlling the smoke baffle of a range hood, characterized in that: at least two sensing modules are installed at intervals along the length of the back of the smoke baffle, and each sensing module is used to sense the concentration and speed of oil fumes.

[0008] The smoke baffle control method includes the following steps:

[0009] Step 1: Turn on the range hood;

[0010] Step 2: Obtain the installation height h of the range hood, and compare h with the preset upper limit value H. max and lower limit value H min Compare, if H min ≤h≤H max Then proceed to step 3;

[0011] Step 3: Control the smoke baffle to open to the angle from which it was last used;

[0012] Step 4: Obtain the data on the oil fume speed and oil fume concentration sensed by each sensing module of the smoke baffle in the current state;

[0013] Step 5: Calculate the stagnation line under the current state. The oil fume velocity is 0 on the stagnation line. Calculate the stagnation line difference curve based on the stagnation line under the current state and the stagnation line under the standard state.

[0014] Step 6: Calculate the nominal conversion factor r. The formula for calculating r is:

[0015]

[0016] Where k is the total number of sensing modules, c i d represents the weighting coefficient corresponding to the oil fume concentration data acquired by the i-th sensing module. i The distance of the i-th sensing module on the hysteresis line difference curve;

[0017] Step 7: Determine whether the nominal conversion factor r is greater than the preset threshold r0. If yes, proceed to step 8; otherwise, maintain the current smoke baffle state.

[0018] Step 8: Determine whether the current smoke baffle opening angle has reached the minimum angle of the range hood's start position. If yes, maintain the current smoke baffle state; otherwise, proceed to step 9.

[0019] Step 9: Optimize the opening angle of the smoke baffle to obtain the optimal opening angle of the smoke baffle;

[0020] Step 10: Control the smoke baffle to open to the optimal opening angle.

[0021] Furthermore, in step 2, if h > H max Then, the smoke baffle is opened to the maximum angle under the starting position of the range hood.

[0022] Furthermore, in step 2, if h < H min Then, the smoke baffle is opened to the minimum angle under the starting position of the range hood.

[0023] To obtain the aforementioned weighting coefficients, a lookup table corresponding to the oil fume concentration data and the weighting coefficients is stored in advance, i.e., in step 6, c i The value of is then determined by looking up the weight coefficient corresponding to the oil fume concentration data in the lookup table.

[0024] Preferably, the method for calculating the stagnation line in step 5 is as follows: by obtaining the positions where the oil fume velocity is 0 sensed by each sensing module along the length of the smoke baffle, and fitting the positions where the oil fume velocity is 0 sensed by all sensing modules, the fitted stagnation line is obtained.

[0025] As an improvement, the specific steps for optimizing the opening angle of the smoke baffle in step 9 are as follows:

[0026] Step 9-1: Set the initial value of the optimization number n to 0, and set the initial values ​​of the first nominal conversion factor r4 and the second nominal conversion factor r3 to r;

[0027] Step 9-2: Set the number of runs m to 0;

[0028] Step 9-3: Calculate the nominal conversion factor r for the m-th iteration. m Then, increment the value of m by 1 and update the value of m.

[0029] Step 9-4: Determine whether the current opening angle of the smoke baffle has reached the minimum angle of the range hood's start position. If yes, proceed to step 9-5; otherwise, proceed to step 9-6.

[0030] Step 9-5: Obtain the minimum value between r3 and r4, and control the current smoke baffle opening angle to run in the state corresponding to the minimum value between r3 and r4 with the nominal conversion factor value, then end;

[0031] Step 9-6: Determine if m is equal to the preset number of runs m0. If yes, proceed to step 9-8; otherwise, proceed to step 9-7. m0 is an odd number greater than or equal to 3.

[0032] Step 9-7: Control the smoke baffle to rotate by an angle f(m) and proceed to step 9-3; f(.) is a preset rotation angle function, and the value of f(m) is the rotation angle of the mth time;

[0033] Steps 9-8: Compare r1, r2, ... r m0 Find the smallest nominal conversion factor, increment the value of n by 1, update the value of n, and assign the smallest nominal conversion factor to r4.

[0034] Step 9-9: Determine if r4 is less than or equal to r3. If yes, proceed to step 9-10; otherwise, proceed to step 9-11.

[0035] Steps 9-10: Let r3 = r2;

[0036] Steps 9-11: Control the smoke baffle to rotate to the state corresponding to the minimum r3;

[0037] Step 9-12: Determine if n is equal to the preset number of optimizations n0. If yes, proceed to step 9-5; otherwise, reset the current nominal conversion factor to zero and proceed to step 9-2.

[0038] Preferably, the formula for calculating f(m) in steps 9-7 is:

[0039] When m is odd, f(m) = m * the0

[0040] When m is even, f(m) = -m * the0

[0041] Where the0 is the unit angle that divides the adjustable range of the smoke baffle into j equal parts, and j is a preset value.

[0042] The technical solution adopted by the present invention to solve the second technical problem mentioned above is: a range hood, comprising...

[0043] The smoke hood has an air inlet on the front.

[0044] A smoke baffle is rotatably connected to the air inlet, thereby opening or closing the air inlet;

[0045] Its characteristic is that it applies the above-mentioned smoke baffle control method.

[0046] To enable automatic measurement of the range hood height, a height sensor for detecting the installation height of the range hood is also included, the height sensor being located on the front side of the smoke collection hood.

[0047] To obtain the stagnation line, each sensing module extends along the width direction of the smoke baffle.

[0048] Compared with existing technologies, the advantages of this invention are as follows: First, by adjusting the operating state of the baffle plate according to the installation height of the range hood, the accuracy of the range hood's operational control is greatly improved, maximizing the performance of the fan. Second, by utilizing the distribution of oil fume concentration and the oil fume velocity stagnation line on the surface of the baffle plate to adjust its operating state, real-time control of the operation process is achieved, ensuring the optimal air intake pattern under the current condition and improving fan performance. Therefore, this control method adjusts the opening and closing angle of the baffle plate based on the installation height and operating conditions of the range hood, ensuring consistent oil fume extraction performance even when the installation height and operating conditions are inconsistent, thus improving the user experience while ensuring overall performance. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the structure of the range hood in an embodiment of the present invention;

[0050] Figure 2 This is a schematic diagram of the lag line in an embodiment of the present invention. Detailed Implementation

[0051] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0052] like Figures 1-2 As shown, the range hood in this embodiment includes a smoke collection hood 3 and a smoke baffle 1. The smoke collection hood 3 has an air inlet 31 on its front side. The smoke baffle 1 is rotatably connected to the air inlet 31, thereby opening or closing the air inlet 31. A height sensor 4 for detecting the installation height of the range hood is also installed on the front side of the smoke collection hood 3. At least two sensing modules 2 are installed at intervals along the length of the back of the smoke baffle 1, and each sensing module 2 is used to sense the concentration and speed of the oil fumes. Figure 1 There are three sensing modules 2 in the middle, and each sensing module 2 extends along the width direction of the smoke baffle 1.

[0053] The above-mentioned smoke baffle control method includes the following steps:

[0054] Step 1: Turn on the range hood;

[0055] Step 2: Obtain the installation height h of the range hood, and compare h with the preset upper limit value H. max and lower limit value H min Compare, if H min ≤h≤H max Then proceed to step 3;

[0056] In this embodiment, if h > H max Then, the smoke baffle is opened to the maximum angle under the starting position of the range hood;

[0057] If h < Hmin Then, the smoke baffle is opened to the minimum angle under the starting position of the range hood;

[0058] Step 3: Control the smoke baffle to open to the angle from which it was last used;

[0059] Step 4: Obtain the data on the oil fume speed and oil fume concentration sensed by each sensing module of the smoke baffle in the current state;

[0060] Step 5: Calculate the stagnation line under the current state. The oil fume velocity is 0 on the stagnation line. Calculate the stagnation line difference curve based on the stagnation line under the current state and the stagnation line under the standard state.

[0061] In this embodiment, the stagnation line is calculated as follows: by obtaining the positions where the oil fume velocity is 0 sensed by each sensing module along the length of the smoke baffle, and fitting the positions where the oil fume velocity is 0 sensed by all sensing modules, the fitted stagnation line is obtained.

[0062] like Figure 2 As shown, f0 is the stagnation line under standard conditions, and f1 is the stagnation line under current conditions. Three sensing modules are installed on f1 to detect the position where the oil fume velocity is 0. In this figure, the upper end of the smoke baffle is rotatably connected to the smoke collection hood 3, and the lower end of the smoke baffle is the free end.

[0063] Step 6: Calculate the nominal conversion factor r. The formula for calculating r is:

[0064]

[0065] Where k is the total number of sensing modules, c i d represents the weighting coefficient corresponding to the oil fume concentration data acquired by the i-th sensing module. i The distance of the i-th sensing module on the hysteresis line difference curve;

[0066] A lookup table containing pre-stored data on oil fume concentration and corresponding weighting coefficients is provided, i.e.: c i The value of is then found in the lookup table by looking up the weight coefficient corresponding to the oil fume concentration data;

[0067] Step 7: Determine whether the nominal conversion factor r is greater than the preset threshold r0. If yes, proceed to step 8; otherwise, maintain the current smoke baffle state.

[0068] Step 8: Determine whether the current smoke baffle opening angle has reached the minimum angle of the range hood's start position. If yes, maintain the current smoke baffle state; otherwise, proceed to step 9.

[0069] Step 9: Optimize the opening angle of the smoke baffle to obtain the optimal opening angle of the smoke baffle;

[0070] Step 10: Control the smoke baffle to open to the optimal opening angle.

[0071] In addition, the specific steps for optimizing the opening angle of the smoke baffle in step 9 above are as follows:

[0072] Step 9-1: Set the initial value of the optimization number n to 0, and set the initial values ​​of the first nominal conversion factor r4 and the second nominal conversion factor r3 to r;

[0073] Step 9-2: Set the number of runs m to 0;

[0074] Step 9-3: Calculate the nominal conversion factor r for the m-th iteration. m Then, increment the value of m by 1 and update the value of m.

[0075] Step 9-4: Determine whether the current opening angle of the smoke baffle has reached the minimum angle of the range hood's start position. If yes, proceed to step 9-5; otherwise, proceed to step 9-6.

[0076] Step 9-5: Obtain the minimum value between r3 and r4, and control the current smoke baffle opening angle to run in the state corresponding to the minimum value between r3 and r4 with the nominal conversion factor value, then end;

[0077] Step 9-6: Determine if m is equal to the preset number of runs m0. If yes, proceed to step 9-8; otherwise, proceed to step 9-7. m0 is an odd number greater than or equal to 3.

[0078] Step 9-7: Control the smoke baffle to rotate by an angle f(m) and proceed to step 9-3; f(.) is a preset rotation angle function, and the value of f(m) is the rotation angle of the mth time;

[0079] The formula for calculating f(m) is:

[0080] When m is odd, f(m) = m * the0

[0081] When m is even, f(m) = -m * the0

[0082] Where, the0 is the unit angle that divides the adjustable range of the smoke baffle into j equal parts, and j is a preset value;

[0083] Steps 9-8: Compare r1, r2, ... r m0 Find the smallest nominal conversion factor, increment the value of n by 1, update the value of n, and assign the smallest nominal conversion factor to r4.

[0084] Step 9-9: Determine if r4 is less than or equal to r3. If yes, proceed to step 9-10; otherwise, proceed to step 9-11.

[0085] Steps 9-10: Let r3 = r2;

[0086] Steps 9-11: Control the smoke baffle to rotate to the state corresponding to the minimum r3;

[0087] Step 9-12: Determine if n is equal to the preset number of optimizations n0. If yes, proceed to step 9-5; otherwise, reset the current nominal conversion factor to zero and proceed to step 9-2.

Claims

1. A method for controlling the smoke baffle of a range hood, characterized in that: At least two sensing modules (2) are installed at intervals along the length of the back of the smoke baffle (1), and each sensing module (2) is used to sense the concentration and speed of the oil fume. The smoke baffle control method includes the following steps: Step 1: Turn on the range hood; Step 2: Obtain the installation height h of the range hood, and compare h with the preset upper limit value H. max and lower limit value H min Compare, if H min ≤h≤H max Then proceed to step 3; Step 3: Control the smoke baffle to open to the angle from which it was last used; Step 4: Obtain the data on the oil fume speed and oil fume concentration sensed by each sensing module of the smoke baffle in the current state; Step 5: Calculate the stagnation line under the current state. The oil fume velocity is 0 on the stagnation line. Calculate the stagnation line difference curve based on the stagnation line under the current state and the stagnation line under the standard state. Step 6: Calculate the nominal conversion factor r. The formula for calculating r is: Where k is the total number of sensing modules, c i d represents the weighting coefficient corresponding to the oil fume concentration data acquired by the i-th sensing module. i The distance of the i-th sensing module on the hysteresis line difference curve; Step 7: Determine whether the nominal conversion factor r is greater than the preset threshold r0. If yes, proceed to step 8; otherwise, maintain the current smoke baffle state. Step 8: Determine whether the current smoke baffle opening angle has reached the minimum angle of the range hood's start position. If yes, maintain the current smoke baffle state; otherwise, proceed to step 9. Step 9: Optimize the opening angle of the smoke baffle to obtain the optimal opening angle of the smoke baffle; The specific steps for optimizing the opening angle of the smoke baffle are as follows: Step 9-1: Set the initial value of the optimization number n to 0, and set the initial values ​​of the first nominal conversion factor r4 and the second nominal conversion factor r3 to r; Step 9-2: Set the number of runs m to 0; Step 9-3: Calculate the nominal conversion factor r for the m-th iteration. m Then, increment the value of m by 1 and update the value of m. Step 9-4: Determine whether the current opening angle of the smoke baffle has reached the minimum angle of the range hood's start position. If yes, proceed to step 9-5; otherwise, proceed to step 9-6. Step 9-5: Obtain the minimum value between r3 and r4, and control the current smoke baffle opening angle to run in the state corresponding to the minimum value between r3 and r4 with the nominal conversion factor value, then end; Step 9-6: Determine if m is equal to the preset number of runs m0. If yes, proceed to step 9-8; otherwise, proceed to step 9-7. m0 is an odd number greater than or equal to 3. Step 9-7: Control the smoke baffle to rotate by an angle f(m) and proceed to step 9-3; f(.) is a preset rotation angle function, and the value of f(m) is the rotation angle of the mth time; The formula for calculating f(m) is: When m is odd, f(m) = m * the0 When m is even, f(m) = -m * the0 Where, the0 is the unit angle that divides the adjustable range of the smoke baffle into j equal parts, and j is a preset value; Steps 9-8: Compare r1, r2, ... r m0 Find the smallest nominal conversion factor, increment the value of n by 1, update the value of n, and assign the smallest nominal conversion factor to r4. Step 9-9: Determine if r4 is less than or equal to r3. If yes, proceed to step 9-10; otherwise, proceed to step 9-11. Steps 9-10: Let r3 = r4; Steps 9-11: Control the smoke baffle to rotate to the state corresponding to the minimum r3; Step 9-12: Determine if n is equal to the preset number of optimizations n0. If yes, proceed to step 9-5; otherwise, reset the current nominal conversion factor to zero and proceed to step 9-2. Step 10: Control the smoke baffle to open to the optimal opening angle.

2. The smoke baffle control method according to claim 1, characterized in that: In step 2, if h > H max Then, the smoke baffle is opened to the maximum angle under the starting position of the range hood.

3. The smoke baffle control method according to claim 2, characterized in that: In step 2, if h < H min Then, the smoke baffle is opened to the minimum angle under the starting position of the range hood.

4. The smoke baffle control method according to claim 3, characterized in that: A lookup table containing pre-stored data on oil fume concentration and corresponding weighting coefficients is provided, i.e., step c in step 6. i The value of is then determined by looking up the weight coefficient corresponding to the oil fume concentration data in the lookup table.

5. The smoke baffle control method according to claim 4, characterized in that: The method for calculating the stagnation line in step 5 is as follows: by obtaining the positions where the oil fume velocity is 0 sensed by each sensing module along the length of the smoke baffle, and fitting the positions where the oil fume velocity is 0 sensed by all sensing modules, the fitted stagnation line is obtained.

6. A range hood, comprising: The smoke hood (3) has an air inlet (31) on the front side; A smoke baffle (1) is rotatably connected to the air inlet (31) in front of it, thereby opening or closing the air inlet (31); Its features are: The smoke baffle (1) is equipped with the control method described in any one of claims 1 to 5.

7. The range hood according to claim 6, characterized in that: It also includes a height sensor (4) for detecting the installation height of the range hood, the height sensor (4) being located on the front side of the smoke collection hood (3).

8. The range hood according to claim 7, characterized in that: Each sensing module (2) extends along the width direction of the smoke baffle (1).

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