A control method for a swingable leaf of a refrigeration-capable range hood

Abstract

The application relates to a control method for a swingable leaf of a refrigeration capable range hood, comprising the following steps: S1, initializing an initial maximum swing angle theta max0 and an initial minimum swing angle theta min0 of the swingable leaf relative to the vertical direction; S2, after starting a refrigeration system, controlling the swingable leaf to adjust to a swingable leaf state at the last time when the refrigeration system stops working within an angle range of theta min0 to theta max0, wherein the swingable leaf state comprises a reciprocating motion state and a hovering state; S3, adjusting the minimum swing angle theta min of the swingable leaf according to application environment parameters of the refrigeration capable range hood; and S4, adjusting the swingable leaf to reciprocate or hover within the angle range of theta min to theta max0 according to a swingable leaf state control command. The control method for the swingable leaf of the refrigeration capable range hood can guarantee good refrigeration and reduce the problem of smoke leakage.

Description

Technical Field

[0001] This invention relates to a method for controlling the louvers of a refrigerated range hood. Background Technology

[0002] To improve the cooking environment, existing technologies have incorporated cooling fans into range hoods, aiming to provide a more comfortable cooking experience for users. For example, the Chinese utility model patent CN209147181U (application number 201821658638.4), entitled "A Cooling Range Hood," includes a cooling component comprising a cooling fan and a cooling duct. The activation of this component is determined based on the ambient temperature. However, the cooling fan in this type of range hood typically controls the louvers that direct the cold air at a fixed angle. Unlike ordinary cooling devices such as air conditioners, where the user's activity area is generally not directly facing the cold air outlet, cooling range hoods are only used in the kitchen. Users are typically positioned in front of the stove while cooking, at which point the cold air outlet is directly facing their activity area. Therefore, users are particularly concerned about whether the cold air outlet of the cooling range hood affects smoke removal and whether it provides a comfortable cooking experience.

[0003] Therefore, this type of refrigerated range hood usually has the following problems:

[0004] 1. When the oscillating blade angle is too small, the cold air will move downwards along the surface of the decorative cover, causing the smoke above the cookware to be disturbed, resulting in serious smoke leakage.

[0005] 2. If the oscillation angle is too large, users will not feel the cold air while cooking, resulting in a poor user experience.

[0006] 3. The swing speed and angle of the blades are fixed, making them unsuitable for kitchen environments. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a louver control method for a cooling range hood that can ensure a good cooling experience while reducing smoke leakage, in contrast to the above-mentioned prior art.

[0008] The technical solution adopted by this invention to solve the above-mentioned technical problems is as follows: a method for controlling the swivel blades of a refrigerated range hood, the refrigerated range hood including a housing, a range hood fan and a refrigeration system disposed within the housing, the refrigeration system including a cold air blower, a cold air outlet corresponding to the air outlet of the cold air blower on the housing, and swivel blades that can swing up and down on the cold air outlet, characterized by including the following steps:

[0009] S1. Initialize the initial maximum swing angle θmax0 and the initial minimum swing angle θmin0 of the blade relative to the vertical direction, initialize the first minimum swing angle θmin1, and initialize the second minimum swing angle θmin2, where θmax0 > θmin1 > θmin2 > θmin0. When the blade swings within the range of angle θmin1 to θmax0, it can prevent cold air from blowing directly on the smoke and causing smoke to escape.

[0010] S2. After the refrigeration system is turned on, within the angle range of θmin0 to θmax0, control the blades to adjust to the blade state when the refrigeration system last ended its operation. The blade state includes reciprocating motion state and hovering state.

[0011] S3. Adjust the minimum swing angle θmin of the blades according to the application environment parameters of the refrigerated range hood;

[0012] S4. Adjust the pendulum blades to swing back and forth or hover within the angle range of θmin to θmax0 according to the pendulum blade status control command.

[0013] Preferably, after adjusting the minimum swing angle θmin, if the pendulum is in a hovering state and the angle θ between the hovering position of the pendulum and the vertical direction is less than θmin, then the pendulum is controlled to swing to the θmin position and hover.

[0014] Preferably, the working modes of the cooling system of the refrigeration range hood include a cooling-only working mode and a combined working mode of cooling and fume extraction. The minimum swing angle θmin of the blades is adjusted by different application environment parameters when the refrigeration range hood is working in different working modes.

[0015] Preferably, when the cooling range hood is operating in cooling-only mode, the speed of the range hood fan is controlled to be V1;

[0016] When the range hood is operating in a combined cooling and fume extraction mode, the speed of the range hood is controlled at V2, where V2 > V1.

[0017] As an improvement, when the cooling range hood is working in the cooling-only mode, the application environment parameters of the cooling range hood include the distance p between the user and the cooling range hood, the smoke concentration n, the operating parameters of the air cooler d, and the ambient temperature t.

[0018] When a cooling range hood operates in a combined cooling and fume extraction mode, the application environment parameters of the cooling range hood include the distance p between the user and the cooling range hood, the fume concentration n, the operating parameters d of the cooling fan, the ambient temperature t, and the operating parameters x of the fume extraction fan.

[0019] As an improvement, when the cooling range hood is operating in cooling-only mode, the method for adjusting the minimum swing angle θmin of the blades includes the following steps:

[0020] SA1. Detect and obtain the distance p between the user and the stove, and detect and obtain the smoke concentration n under the refrigerated range hood;

[0021] SA2. Compare p with the first distance threshold p1. If p > p1, proceed to SA3; if p ≤ p1, proceed to SA5.

[0022] SA3. Compare n with the first flue gas concentration threshold N1;

[0023] If n≥N1, then perform SA4;

[0024] If n < N1, then adjust the minimum swing angle of the pendulum blade θmin = θmin0;

[0025] SA4. Obtain the current working parameter d of the air cooler. If d ≥ d1, where d1 is the threshold of the working parameter of the air cooler, it is determined that this will cause smoke leakage. Then, the minimum swing angle θmin = θmin1 of the blades is adjusted. If d < d1, it is determined that there is a risk of smoke leakage. Then, based on the set growth rate, the minimum swing angle θmin of the blades is gradually increased from θmin0 to θmin1.

[0026] SA5. Compare n with the second flue gas concentration threshold N2, where N2 < N1;

[0027] If n≥N2, then adjust the minimum swing angle of the pendulum blade θmin=θmin1;

[0028] If n < N2, then determine the current state of the pendulum.

[0029] If the pendulum is in a hovering state, adjust the minimum swing angle of the pendulum θmin = θmin0;

[0030] If the pendulum is in a reciprocating motion state, then SA6 is performed;

[0031] SA6. Detect and obtain the ambient temperature t, and compare t with the first temperature threshold T1;

[0032] If t≥T1, then adjust the minimum swing angle of the pendulum blade θmin=θmin0;

[0033] If t < T1, then based on the set growth rate, the minimum swing angle θmin of the pendulum will be gradually increased from θmin0 to θmin1.

[0034] As an improvement, when the cooling range hood is operating in a combined cooling and fume extraction mode, the method for adjusting the minimum swing angle θmin of the blades includes the following steps:

[0035] SB1: Detect and obtain the distance p between the user and the stove, and detect and obtain the smoke concentration n below the refrigerated range hood;

[0036] SB2. Compare p with the second distance threshold p2. If p > p2, proceed to SB3; if p ≤ p2, proceed to SB7.

[0037] SB3. Compare n with the third flue gas concentration threshold N3;

[0038] If n≥N3, then perform SB4;

[0039] If n < N3, then perform SB5;

[0040] SB4. Obtain the operating parameters d of the evaporative cooler and x of the range hood;

[0041] If d≥x, it is determined that this will lead to smoke leakage, and the minimum swing angle of the blade θmin=θmin1 is adjusted accordingly;

[0042] If d < x, it is determined that there is a risk of smoke leakage, and then the minimum swing angle θmin of the blade is gradually increased from θmin0 to θmin2 based on the set growth rate.

[0043] SB5. Obtain the operating parameter x of the range hood and compare it with the operating parameter threshold x1 of the range hood. If x ≤ x1, proceed to SB6; if x > x1, adjust the minimum swing angle θmin = θmin2 of the blades.

[0044] SB6. Detect and obtain the ambient temperature t, and compare t with the second temperature threshold T2;

[0045] If t≥T2, then adjust the minimum swing angle of the pendulum blade θmin=θmin0;

[0046] If t < T2, then based on the set growth rate, the minimum swing angle θmin of the pendulum will be gradually increased from θmin0 to θmin1.

[0047] SB7. Compare n with the fourth flue gas concentration threshold N4;

[0048] If n≥N4, then adjust the minimum swing angle of the pendulum blade θmin=θmin1;

[0049] If n < N4, then perform SB8;

[0050] SB8. Determine the current state of the blades;

[0051] If the pendulum is in a hovering state, adjust the minimum swing angle of the pendulum θmin = θmin0;

[0052] If the pendulum is in a reciprocating motion state, then SB9 is performed;

[0053] SB9. Detect and obtain the ambient temperature t, and compare t with the third temperature threshold T3;

[0054] If t≥T3, then adjust the minimum swing angle of the pendulum blade θmin=θmin2;

[0055] If t < T3, then based on the set growth rate, the minimum swing angle θmin of the pendulum will be gradually increased from θmin0 to θmin1.

[0056] As an improvement, when p≤p2 and n≥N4, the swing speed of the pendulum is controlled to be increased to the set rapid swing speed Vk, compared to the basic swing speed V0 of the pendulum.

[0057] Compared with existing technologies, the advantages of this invention are as follows: The blade control method for the refrigerated range hood in this invention can adjust the minimum swing angle θmin of the blades based on the application environment parameters of the refrigerated range hood when the refrigeration system is working. This allows the blades to swing back and forth or hover within a more suitable angle range of θmin to θmax0. Compared with the existing technology where the blades operate within a fixed angle range, this method can avoid interfering with the fumes below the refrigerated range hood based on the application environment, and avoids the problem of smoke escape caused by the direction of the blown cold air. At the same time, it can ensure the user's cooling needs and avoid the problem of direct airflow to the user in low-temperature conditions. In short, it takes into account both the user's cooling needs and the impact on fumes, making it more user-friendly. Attached Figure Description

[0058] Figure 1 This is a flowchart of the blade control method for a refrigerated range hood in an embodiment of the present invention.

[0059] Figure 2 This is a flowchart illustrating the method for adjusting the minimum swing angle of the blades in a cooling range hood operating in cooling-only mode, as described in this embodiment of the invention.

[0060] Figure 3 This is a flowchart illustrating the method for adjusting the minimum swing angle of the blades in a cooling range hood operating under a combined cooling and fume extraction mode, as described in an embodiment of the present invention. Detailed Implementation

[0061] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0062] The blade control method for a refrigerated range hood in this embodiment is used in a refrigerated range hood. A refrigerated range hood typically includes a housing, a range hood fan, and a refrigeration system housed within the housing. The refrigeration system includes a cooler fan, and a cooler vent is provided on the housing corresponding to the cooler fan's outlet. The cooler vent has blades that can swing up and down. By controlling the swing of the blades, the direction of the cooler air blown out by the cooler fan can be adjusted. The cooler vent is usually located at the top of the range hood. The blades can perform a reciprocating up-and-down swinging motion. Typically, the initial maximum swing angle θmax0 and the initial minimum swing angle θmin0 relative to the vertical direction are set as needed. The initial maximum angle θmax0 is the maximum limit angle value during the blade swing process. This angle may be influenced by the mechanical structure or can be manually set; θmax0 can be set to 75°. The initial minimum angle θmin0 is the minimum limit angle value during the swing of the blades. This angle ensures that the cold air blown out by the air cooler can still flow out normally and with low noise when it is at its highest output. Generally, θmin0 is set to 30°.

[0063] Under normal installation conditions, the unit is mounted on a vertical wall. The cold air from the evaporative air cooler typically blows horizontally towards the oscillating blades, and after being reflected by the blades, it is blown downwards into the cooking space. Obviously, when the angle between the oscillating blades and the vertical direction is 45°, the cold air will change from a horizontal flow to a vertical downward flow due to the influence of the oscillating blades. At this time, if there is rising smoke above the cookware, it will escape due to the downward flow of cold air, affecting the smoke extraction effect. Simultaneously, the cold air will also be drawn out of the kitchen along with the smoke, resulting in a decrease in cooling efficiency. Furthermore, cooking fumes diffuse. To ensure that diffused fumes are not dispersed by the cold air, an oscillating blade angle of 47° can be set. Adjustments can be made for special installation conditions where deviations may occur.

[0064] like Figure 1 As shown, the blade control method of the refrigerated range hood in this embodiment includes the following steps.

[0065] S1. Initialize the initial maximum swing angle θmax0 and initial minimum swing angle θmin0 of the blade relative to the vertical direction, initialize the first minimum swing angle θmin1, and initialize the second minimum swing angle θmin2, where θmax0 > θmin1 > θmin2 > θmin0. When the blade swings within the range of angles θmin1 to θmax0, it can prevent cold air from directly blowing on the smoke and causing smoke to escape. In this embodiment, θmax0 = 75°, θmin0 = 30°, θmin1 = 47°, and θmin2 = (θmin1 + θmin0) / 2 = 38.5°.

[0066] In addition, the basic swing speed V0 of the pendulum is usually set, but based on some working conditions, it is necessary to increase the swing speed of the pendulum. In this embodiment, an additional rapid swing speed Vk of the pendulum is set, where Vk > V0.

[0067] S2. Each time the refrigeration system finishes operating, the final operating state of the oscillating blades is stored for use the next time the refrigeration system is started, in order to best adapt to the user's usage habits. When the oscillating blades are in a hovering state, the hovering angle of the oscillating blades is also stored.

[0068] After the cooling system is turned on, since the working environment of the range hood is not adjusted immediately, the movement range of the blades is initially limited according to the initial maximum swing angle θmax0 and the initial minimum swing angle θmin0. That is, within the angle range of θmin0 to θmax0, the blades are controlled to adjust to the state they were in when the cooling system last stopped operating. This state includes reciprocating motion and hovering. If the blades were in reciprocating motion when the cooling system last stopped operating, they are controlled to swing within the angle range of θmin0 to θmax0. If the blades were in hovering when the cooling system last stopped operating, they are controlled to swing to the previous hovering angle θ and remain in that hovering state. When the cooling system is first turned on, to ensure the blades open quickly and reach the hovering position quickly, the blades can be controlled to move at a rapid swing speed Vk during the swing to the maximum swing angle and during the swing to the hovering position. Then, the blades are controlled to swing at a base swing speed V0 as needed.

[0069] S3. Adjust the minimum swing angle θmin of the blades according to the application environment parameters of the cooling range hood. By adjusting the minimum swing angle θmin, the range of motion of the blades can be adapted to the working environment of the cooling range hood, ensuring that the user feels cool but not cold, and avoiding smoke leakage caused by interference with the smoke.

[0070] S4. Adjust the pendulum blades to swing back and forth or hover within the angle range of θmin to θmax0 according to the pendulum blade status control command.

[0071] Specifically, after adjusting the minimum swing angle θmin, if the pendulum is in a hovering state and the angle θ between the hovering position and the vertical direction is less than θmin, then the pendulum is controlled to swing to the θmin position and hover. Of course, if the pendulum is in a hovering state and the angle θ between the hovering position and the vertical direction is already within the range of θmin to θmax0, then the pendulum simply remains in the hovering position.

[0072] In addition, during the operation of the refrigeration system, users may adjust the working state of the oscillating blades. For example, they can control the oscillating blades in a hovering state to change to a reciprocating motion state, or control the oscillating blades in a reciprocating motion state to change to a hovering state at the desired position. However, the range of motion of the oscillating blades is always limited to the angle range of θmin to θmax0.

[0073] The cooling system of a range hood can operate in two modes: a cooling-only mode and a combined cooling and fume extraction mode. Different environmental parameters are used to adjust the minimum oscillation angle θmin of the louvers in each mode. Specifically, in cooling-only mode, the environmental parameters include the distance p between the user and the hood, the smoke concentration n, the cooling fan's operating parameter d, and the ambient temperature t. In the combined cooling and fume extraction mode, the parameters include the distance p between the user and the hood, the smoke concentration n, the cooling fan's operating parameter d, the ambient temperature t, and the fume extraction fan's operating parameter x. The cooling fan and range hood operating parameters use the same data type, which can include settings such as speed, rotation speed, and airflow.

[0074] In addition, in this embodiment, when the cooling range hood is operating in cooling-only mode, the speed of the range hood fan is controlled at V1; when the cooling range hood is operating in a combined cooling and fume extraction mode, the speed of the range hood fan is controlled at V2, where V2 > V1. In cooling-only mode, users typically do not perform cooking activities that produce a lot of smoke, but may perform cooking activities such as steaming or boiling that generate less smoke. In this cooling-only mode, the control can prevent the range hood fan from operating at a low speed V1, and can also extract any possible smoke, ensuring a safe cooking environment. Of course, in the combined cooling and fume extraction mode, the speed of the range hood V2 can be different values, adjusted according to specific cooking requirements.

[0075] like Figure 2 As shown, when the cooling range hood is working in cooling-only mode, the method for adjusting the minimum swing angle θmin of the blades includes the following steps.

[0076] SA1 detects and obtains the distance p between the user and the stove, and detects and obtains the smoke concentration n under the refrigerated range hood.

[0077] SA2. Compare p with the first distance threshold p1. p1 can be set according to experience. In this embodiment, p1 = 60cm is set.

[0078] If p > p1, it means the user is relatively far from the stove. In this case, the cold air blown out will have a relatively small impact on people. The focus is more on the impact on the smoke below the cooling range hood to avoid smoke leakage. In this case, SA3 will be performed.

[0079] If p≤p1, it means the user is relatively close to the stove. We need to consider both the impact on the user's comfort and the impact on the smoke below the refrigeration range hood, then SA5 should be performed.

[0080] SA3. Compare n with the first flue gas concentration threshold N1. In this embodiment, N1 = 0.8 mg / m³ 3 .

[0081] If n≥N1, it means that the smoke concentration below the cooling range hood is relatively high. Therefore, it is necessary to avoid the cold air blowing out to interfere with the smoke and thus avoid the problem of smoke escape. In this case, SA4 is performed.

[0082] If n < N1, it means that the smoke concentration below the cooling range hood is relatively low, and there is no need to consider the problem of smoke escape. The range of motion of the blades can ensure the rapid cooling effect. Based on this, the minimum swing angle of the blades is adjusted to θmin = θmin0, that is, the minimum swing angle is kept unchanged at the initial minimum swing angle θmin0.

[0083] SA4. Obtain the current operating parameter d of the air cooler. This operating parameter d is a parameter such as gear, speed or air volume. The larger d is, the greater the air volume.

[0084] Based on this, if d≥d1, where d1 is the threshold value of the working parameters of the air cooler, then the wind blown out by the guide blades is very likely to interfere with the smoke and vapor, which will lead to the problem of smoke leakage. Therefore, the minimum swing angle of the blades θmin=θmin1 is adjusted to prevent the cold air from blowing into the area where the smoke and vapor diffuses, thus avoiding the problem of smoke leakage.

[0085] If d < d1, although the airflow of cold air is limited, the high concentration of smoke indicates a risk of smoke leakage. Therefore, based on the set growth rate, the minimum swing angle θmin of the oscillating blades is gradually increased from θmin0 to θmin1. In this embodiment, the adjustment cycle is the time it takes for the oscillating blades to complete one cycle, with each adjustment being 0.25°. This ensures the cooling effect while minimizing the possibility of smoke leakage.

[0086] SA5. Compare n with the second flue gas concentration threshold N2. N2 < N1. In this embodiment, N2 = 0.7 mg / m³. 3 .

[0087] If n≥N2, it means that the smoke concentration is relatively high and the possibility of smoke leakage is relatively high. In this case, the minimum swing angle of the blades θmin=θmin1 should be adjusted to eliminate the possibility of smoke leakage.

[0088] If n < N2, it means that the flue gas concentration is relatively low, so determine the current blade swing state.

[0089] If the pendulum is in a hovering state, the user will most likely use the hovering of the pendulum to cool a specific location. In this case, the minimum swing angle of the pendulum is adjusted to θmin = θmin0 to ensure that the hovering position of the pendulum is the position set by the user.

[0090] If the pendulum is in a reciprocating motion state, then SA6 is performed.

[0091] SA6. Detect and obtain the ambient temperature t, and compare t with the first temperature threshold T1. In this embodiment, T1 = 28℃.

[0092] If t ≥ T1, it indicates that the ambient temperature is high, requiring rapid cooling to ensure user comfort. In this case, adjust the minimum swing angle of the oscillating blades θmin = θmin0. This ensures a sufficiently large range of motion for the oscillating blades, maximizing the satisfaction of users' cooling needs.

[0093] If t < T1, it means that the ambient temperature has reached its lowest point. In order to ensure that the air conditioning does not blow directly on the user's head, the minimum swing angle θmin of the oscillating blades is gradually increased from θmin0 to θmin1 based on the set growth rate.

[0094] like Figure 3 As shown, when the cooling range hood is working in the combined cooling and fume extraction mode, the temperature is low. Users are usually cooking with oily fumes, so they need to pay special attention to the impact of the cold air from the source on the fumes. Based on this, the adjustment method of the minimum swing angle θmin of the blades includes the following steps.

[0095] SB1: Detect and obtain the distance p between the user and the stove, and detect and obtain the smoke concentration n below the refrigerated range hood;

[0096] SB2. Compare p with the second distance threshold p2. In this embodiment, p2 = 55cm. If p > p2, it means that the user is not in the kitchen or is far from the stove. In this case, the impact on the user's physical experience is small, so proceed to SB3. If p ≤ p2, it means that the user is close to the stove. It is necessary to pay attention to both the impact of cold air on the user's physical experience and the interference of smoke. So proceed to SB7.

[0097] SB3. Compare n with the third flue gas concentration threshold N3. In this embodiment, N3 = 0.8 mg / m³. 3 .

[0098] If n≥N3, then perform SB4.

[0099] If n < N3, then perform SB5.

[0100] SB4. Obtain the operating parameters d of the evaporative air cooler and x of the range hood.

[0101] If d≥x, under conditions of high smoke concentration and strong cold air force, it is determined that this will lead to smoke leakage. Therefore, the minimum swing angle of the blades is adjusted to θmin=θmin1, so that the blades move within the range of θmin1~θmax0, thereby avoiding the impact on the smoke and preventing smoke leakage.

[0102] If d < x, under conditions of high smoke levels, although the suction power for oil fume extraction is greater than that for cold air, it is determined that there is a risk of smoke leakage. Therefore, based on the set growth rate, the minimum swing angle θmin of the oscillating blades is gradually increased from θmin0 to θmin2. This ensures both cooling of the environment and minimizes the risk of smoke leakage.

[0103] SB5. Obtain the operating parameter x of the range hood and compare it with the threshold x1 of the range hood operating parameter. If x ≤ x1, proceed to SB6. If x > x1, it indicates that the air volume or air force of the range hood is too small. To prevent the cold air from being drawn away by the range hood, adjust the minimum swing angle θmin = θmin2 of the blades to prevent the cold air outlet from approaching the smoke inlet of the cooling range hood.

[0104] SB6. Detect and obtain the ambient temperature t, and compare t with the second temperature threshold T2. In this embodiment, T2 = 28℃.

[0105] If t≥T2, it means that the ambient temperature is high. Given the low flue gas concentration, the cooling demand should be prioritized, allowing the blades to swing over a wider range to accelerate cooling. Therefore, the minimum swing angle of the blades should be adjusted to θmin=θmin0.

[0106] If t < T2, it means that the cooling demand is basically met. In this case, while ensuring the user's cooling experience, the impact on the flue gas is also taken into account. Based on the set growth rate, the minimum swing angle θmin of the blade is gradually increased from θmin0 to θmin1.

[0107] SB7. Compare n with the fourth flue gas concentration threshold N4. In this embodiment, N4 = 0.7 mg / m³. 3 .

[0108] If n ≥ N4, it indicates a high smoke concentration, which may cause smoke leakage. In this case, the minimum swing angle of the blades should be adjusted to θmin = θmin1 to avoid the impact of the blown-out cold air on the smoke. Additionally, if the blades are in reciprocating motion, the swing speed should be increased to the set rapid swing speed Vk, relative to the blades' base swing speed V0.

[0109] If n < N4, then proceed with SB8.

[0110] SB8. At this time, the user is in front of the stove. Due to the low concentration of smoke, the probability of smoke escaping is small. At this time, determine the current state of the swishing blade.

[0111] If the blade is in a hovering state, adjust the minimum swing angle of the blade θmin = θmin0, that is, do not change the angle value to ensure the user's cooling experience.

[0112] If the pendulum is in a reciprocating motion state, then SB9 is performed.

[0113] SB9. Detect and obtain the ambient temperature t, and compare t with the third temperature threshold T3. In this embodiment, T3 = 28℃.

[0114] If t≥T3, then adjust the minimum swing angle of the blades θmin=θmin2 to ensure the user's cooling experience.

[0115] If t < T3, then based on the set growth rate, the minimum swing angle θmin of the pendulum will be gradually increased from θmin0 to θmin1.

[0116] The blade control method for a refrigerated range hood in this invention allows for adjustment of the minimum swing angle θmin of the blades based on the application environment parameters of the refrigerated range hood during operation of the refrigeration system. This enables the blades to reciprocate or hover within a more suitable angle range of θmin to θmax0. Compared to existing technologies where the blades operate within a fixed angle range, this method avoids interference with cooking fumes below the refrigerated range hood and prevents smoke escape due to the direction of the blown cold air. It also ensures the user's cooling needs are met while avoiding direct airflow at low temperatures. In short, it balances the user's cooling needs with the impact on cooking fumes, making it more user-friendly.

Claims

1. A method for controlling the swivel blades of a refrigerated range hood, the refrigerated range hood comprising a housing, a range hood fan and a refrigeration system disposed within the housing, the refrigeration system comprising a cold air blower, a cold air outlet corresponding to the air outlet of the cold air blower on the housing, and swivel blades that can swing up and down on the cold air outlet, characterized in that: Includes the following steps: S1. Initialize the initial maximum swing angle θmax0 and the initial minimum swing angle θmin0 of the blade relative to the vertical direction, initialize the first minimum swing angle θmin1, initialize the second minimum swing angle θmin2, where θmax0>θmin1>θmin2>θmin0. When the blade swings within the range of angles θmin1~θmax0, it can prevent cold air from blowing directly on the smoke and causing smoke to escape. S2. After the refrigeration system is turned on, within the angle range of θmin0~θmax0, control the blades to adjust to the blade state when the refrigeration system last ended its operation. The blade state includes reciprocating motion state and hovering state. S3. Adjust the minimum swing angle θmin of the blades according to the application environment parameters of the refrigerated range hood; S4. Adjust the swing blade to reciprocate or hover within the angle range of θmin~θmax0 according to the swing blade status control command; After adjusting the minimum swing angle θmin, if the pendulum is in a hovering state and the angle θ between the hovering position of the pendulum and the vertical direction is less than θmin, then control the pendulum to swing to the θmin position and hover. The working modes of the cooling system of the refrigerated range hood include a cooling-only working mode and a combined working mode of cooling and fume extraction. The minimum swing angle θmin of the blades is adjusted according to different application environment parameters when the refrigerated range hood is working in different working modes. When the cooling range hood is working in cooling-only mode, the application environment parameters of the cooling range hood include the distance p between the user and the cooling range hood, the smoke concentration n, the operating parameters of the air cooler d, and the ambient temperature t. When a cooling range hood operates in a combined cooling and fume extraction mode, the application environment parameters of the cooling range hood include the distance p between the user and the cooling range hood, the fume concentration n, the operating parameters d of the cooling fan, the ambient temperature t, and the operating parameters x of the fume extraction fan.

2. The method for controlling the louver of a refrigerated range hood according to claim 1, characterized in that: When the cooling range hood is working in cooling-only mode, the speed of the range hood fan is controlled to be V1; When the range hood is operating in a combined cooling and fume extraction mode, the speed of the range hood is controlled at V2, where V2 > V1.

3. The method for controlling the louver of a refrigerated range hood according to claim 1, characterized in that: When a range hood capable of cooling is operating in cooling-only mode, the method for adjusting the minimum swing angle θmin of the blades includes the following steps: SA1. Detect and obtain the distance p between the user and the stove, and detect and obtain the smoke concentration n under the refrigerated range hood; SA2. Compare p with the first distance threshold p1. If p > p1, proceed to SA3; if p ≤ p1, proceed to SA5. SA3. Compare n with the first flue gas concentration threshold N1; If n≥N1, then perform SA4; If n < N1, then adjust the minimum swing angle of the pendulum blade θmin = θmin0; SA4. Obtain the current working parameter d of the air cooler. If d ≥ d1, where d1 is the threshold of the working parameter of the air cooler, it is determined that this will cause smoke leakage. Then, the minimum swing angle θmin = θmin1 of the blades is adjusted. If d < d1, it is determined that there is a risk of smoke leakage. Then, based on the set growth rate, the minimum swing angle θmin of the blades is gradually increased from θmin0 to θmin1. SA5. Compare n with the second flue gas concentration threshold N2, where N2 < N1; If n≥N2, then adjust the minimum swing angle of the pendulum blade θmin=θmin1; If n < N2, then determine the current state of the pendulum. If the pendulum is in a hovering state, adjust the minimum swing angle of the pendulum to θmin = θmin0; If the pendulum is in a reciprocating motion state, then SA6 is performed; SA6. Detect and obtain the ambient temperature t, and compare t with the first temperature threshold T1; If t≥T1, then adjust the minimum swing angle of the pendulum blade θmin=θmin0; If t < T1, then based on the set growth rate, the minimum swing angle θmin of the pendulum will be gradually increased from θmin0 to θmin1.

4. The method for controlling the louver of a refrigerated range hood according to claim 1, characterized in that: When a range hood capable of cooling and fume extraction is operating in a combined cooling and fume extraction mode, the method for adjusting the minimum swing angle θmin of the blades includes the following steps: SB1: Detect and obtain the distance p between the user and the stove, and detect and obtain the smoke concentration n below the refrigerated range hood; SB2. Compare p with the second distance threshold p2. If p > p2, proceed to SB3; if p ≤ p2, proceed to SB7. SB3. Compare n with the third flue gas concentration threshold N3; If n≥N3, then perform SB4; If n < N3, then perform SB5; SB4. Obtain the operating parameters d of the evaporative cooler and x of the range hood; If d≥x, it is determined that this will lead to smoke leakage, and the minimum swing angle of the blade is adjusted to θmin=θmin1. If d < x, it is determined that there is a risk of smoke leakage, and then the minimum swing angle θmin of the blade is gradually increased from θmin0 to θmin2 based on the set growth rate. SB5. Obtain the operating parameter x of the range hood and compare it with the operating parameter threshold x1 of the range hood. If x ≤ x1, proceed to SB6; if x > x1, adjust the minimum swing angle θmin = θmin2 of the blades. SB6. Detect and obtain the ambient temperature t, and compare t with the second temperature threshold T2; If t≥T2, then adjust the minimum swing angle of the pendulum blade θmin=θmin0; If t < T2, then based on the set growth rate, the minimum swing angle θmin of the pendulum will be gradually increased from θmin0 to θmin1. SB7. Compare n with the fourth flue gas concentration threshold N4; If n≥N4, then adjust the minimum swing angle of the pendulum blade θmin=θmin1; If n < N4, then perform SB8; SB8. Determine the current state of the blades; If the pendulum is in a hovering state, adjust the minimum swing angle of the pendulum to θmin = θmin0; If the pendulum is in a reciprocating motion state, then SB9 is performed; SB9. Detect and obtain the ambient temperature t, and compare t with the third temperature threshold T3; If t≥T3, then adjust the minimum swing angle of the pendulum blade θmin=θmin2; If t < T3, then based on the set growth rate, the minimum swing angle θmin of the pendulum will be gradually increased from θmin0 to θmin1.

5. The method for controlling the louver of a refrigerated range hood according to claim 4, characterized in that: When p≤p2 and n≥N4, compared to the basic swing speed V0 of the pendulum, the swing speed of the pendulum is controlled to increase to the set rapid swing speed Vk.

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