Range hood control method and range hood

Abstract

The present application relates to a range hood control method and range hood, and belongs to the field of smart home appliance technology. The method includes: during the self-cleaning process, obtaining the current fan gear and current water output of the range hood; querying the current fan speed and current fan power corresponding to the current fan gear, and querying the current wind pressure corresponding to the current fan power; determining the current centrifugal force based on the current water output, the current fan speed, the number of fan impellers, and the fan impeller radius; determining the current suction based on the current wind pressure and the fan impeller area; determining the current resultant force based on the current centrifugal force, the current suction, and the fan inclination angle; if the current resultant force is less than gravity, raising the current fan gear to a preset gear, and repeating the steps of querying the current fan speed and current fan power corresponding to the current fan gear until the current resultant force is greater than or equal to gravity. The present application can prevent the range hood from dripping during the self-cleaning process.

Description

Technical Field

[0001] The present application relates to the technical field of smart home appliances, and in particular to a control method for a range hood and a range hood. Background Art

[0002] Currently, range hoods with self-cleaning features often experience dripping during the cleaning process. This dripping can be caused by: installation issues, where the unit is installed at a certain angle; and design issues, where the impeller is installed at a certain angle (75° to 90°) within the housing (wind cabinet). When water pumped from the pump sprays onto the impeller, gravity forces water droplets on the upper portion of the impeller to fall outside the housing (wind cabinet), leading to customer complaints and after-sales service issues. Summary of the Invention

[0003] Based on this, it is necessary to provide a range hood control method and a range hood to address the above technical issues.

[0004] In a first aspect, a method for controlling a range hood is provided, the method comprising:

[0005] During the self-cleaning process, obtain the current fan gear and current water output of the range hood;

[0006] In the pre-stored correspondence between the fan gear, the fan speed and the fan power, query the current fan speed and the current fan power corresponding to the current fan gear, and query the current wind pressure corresponding to the current fan power based on the pre-stored wind volume-wind pressure-power curve;

[0007] Determining a current centrifugal force on water droplets on the fan impeller according to the current water output, the current fan speed, the pre-stored number of fan impellers, and the fan impeller radius;

[0008] determining a current suction force exerted on the water droplets on the fan impeller according to the current wind pressure and a pre-stored fan impeller area;

[0009] Determining a current resultant force on the water droplets on the fan impeller in a direction opposite to gravity based on the current centrifugal force, the current suction force, and a pre-stored fan inclination angle;

[0010] If the current resultant force acting on the water droplets on the fan impeller in the direction opposite to gravity is less than gravity, the current fan gear is increased to a preset gear, and the steps of querying the current fan speed and the current fan power corresponding to the current fan gear are repeated until the current resultant force acting on the water droplets on the fan impeller in the direction opposite to gravity is greater than or equal to gravity.

[0011] As an optional implementation, if the current resultant force acting on the water droplets on the fan impeller in the direction opposite to gravity is greater than or equal to gravity, the current fan gear position is maintained unchanged.

[0012] As an optional implementation manner, the formula for determining the current centrifugal force exerted on the water droplets on the fan impeller based on the current water output, the current fan speed, the pre-stored number of fan impellers, and the fan impeller radius is:

[0013]

[0014] Among them, F represents the current centrifugal force on the water droplet, and M represents the current water output, in m 2 / s, n represents the number of fan impellers, V represents the current fan speed, and R represents the fan impeller radius.

[0015] As an optional implementation manner, the formula for determining the current suction force on the water droplets on the fan impeller based on the current wind pressure and the pre-stored fan impeller area is:

[0016]

[0017] Among them, f represents the current suction force on the water droplet, P represents the current wind pressure, and S represents the fan impeller area.

[0018] As an optional implementation manner, the formula for determining the current resultant force exerted on the water droplets on the fan impeller in the opposite direction of gravity based on the current centrifugal force, the current suction force, and the pre-stored fan inclination angle is:

[0019] F N =Fcosθ+fsinθ

[0020] Among them, F N It represents the current resultant force on the water droplet in the opposite direction of gravity, F represents the current centrifugal force on the water droplet, f represents the current suction force on the water droplet, and θ represents the fan inclination angle.

[0021] As an optional implementation, the method further includes:

[0022] When self-cleaning is started, the fan is controlled to run for a preset running time according to the preset initial gear, and then the water pump is controlled to pump water.

[0023] As an optional implementation manner, the fan inclination angle is the sum of the fan design inclination angle and the range hood installation inclination angle.

[0024] In a second aspect, a range hood is provided, comprising a main control device, a fan and a water pump; wherein:

[0025] The main control device is used to obtain the current fan gear position of the fan of the range hood and the current water output of the water pump during the self-cleaning process;

[0026] The main control device is used to query the current fan speed and current fan power corresponding to the current fan gear in the pre-stored correspondence between the fan gear, the fan speed and the fan power, and query the current wind pressure corresponding to the current fan power based on the pre-stored wind volume-wind pressure-power curve;

[0027] The main control device is used to determine the current centrifugal force exerted on the water droplets on the fan impeller according to the current water output, the current fan speed, the pre-stored number of fan impellers and the fan impeller radius;

[0028] The main control device is used to determine the current suction force exerted on the water droplets on the fan impeller according to the current wind pressure and the pre-stored fan impeller area;

[0029] The main control device is used to determine the current resultant force exerted on the water droplets on the fan impeller in the opposite direction of gravity based on the current centrifugal force, the current suction force and the pre-stored fan inclination angle;

[0030] The main control device is used to increase the current fan gear of the fan to a preset gear if the current resultant force acting on the water droplets on the fan impeller in the opposite direction of gravity is less than gravity, and repeatedly execute the steps of querying the current fan speed and the current fan power corresponding to the current fan gear until the current resultant force acting on the water droplets on the fan impeller in the opposite direction of gravity is greater than or equal to gravity.

[0031] As an optional embodiment, the main control device is used to maintain the current fan gear of the fan unchanged if the current resultant force acting on the water droplets on the fan impeller in the opposite direction of gravity is greater than or equal to gravity.

[0032] As an optional embodiment, the main control device is used to control the fan to run for a preset running time according to a preset initial gear when self-cleaning is started, and then control the water pump to pump water.

[0033] As an optional implementation manner, the fan inclination angle is the sum of the fan design inclination angle and the range hood installation inclination angle.

[0034] The present application provides a range hood control method and range hood. The technical solutions provided by the embodiments of the present application provide at least the following beneficial effects: During the self-cleaning process, the range hood obtains the current fan gear position and the current water output. The range hood then queries the current fan speed and current fan power corresponding to the current fan gear position from a pre-stored correspondence between fan gear position, fan speed, and fan power. Based on a pre-stored air volume-air pressure-power curve, the range hood also queries the current wind pressure corresponding to the current fan power. The range hood then determines the current centrifugal force acting on water droplets on the fan impeller based on the current water output, current fan speed, pre-stored number of fan impellers, and fan impeller radius. It also determines the current suction force acting on the water droplets on the fan impeller based on the current wind pressure and the pre-stored fan impeller area. The range hood then determines the current net force acting on the water droplets on the fan impeller in the direction opposite to gravity based on the current centrifugal force, current suction force, and the pre-stored fan tilt angle. Finally, if the current net force acting on the water droplets on the fan impeller in the direction opposite to gravity is less than gravity, the range hood increases the current fan gear to a preset gear and repeats the steps of querying the current fan speed and current fan power corresponding to the current fan gear until the current net force acting on the water droplets on the fan impeller in the direction opposite to gravity is greater than or equal to gravity. In this way, by adjusting the range hood gear during the range hood's self-cleaning process, the current net force acting on the water droplets on the range hood's fan impeller in the direction opposite to gravity is greater than or equal to gravity, thereby preventing the range hood from dripping during the self-cleaning process.

[0035] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 A schematic structural diagram of a range hood provided in an embodiment of the present application;

[0038] Figure 2 A flow chart of a range hood control method provided in an embodiment of the present application;

[0039] Figure 3 An air volume-air pressure-power curve diagram provided in an embodiment of the present application;

[0040] Figure 4 A force analysis diagram provided in an embodiment of the present application;

[0041] Figure 5 This is a flowchart of an example of a range hood control method provided in an embodiment of the present application;

[0042] Figure 6 A schematic structural diagram of a range hood provided in an embodiment of the present application. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0044] Figure 1 This is a schematic diagram of the structure of a range hood provided in an embodiment of the present application. Figure 1 As shown, the fan impeller of a range hood is tilted at a certain angle due to design and installation requirements. When the range hood is tilted, water droplets on the fan impeller may drip due to gravity during self-cleaning, leading to customer complaints and after-sales issues. Water droplets on a range hood fan impeller are typically affected by three forces. The first is the weight of the water droplets themselves, which is determined by their mass. The second is the centrifugal force generated by the rotation of the fan impeller, which is determined by the mass of the water droplets, the fan speed, and the fan radius. The third is the suction force exerted on the water droplets by the fan, which is determined by the fan pressure and the fan area. The higher the fan speed of the range hood, the faster the fan impeller speed. Based on the principle of centrifugal force, the centrifugal force on the water droplets on the fan impeller increases. At the same time, the higher the fan gear of the range hood, the greater the fan power, the greater the fan pressure, and the greater the suction force on the water droplets on the fan impeller.

[0045] The following will describe in detail a range hood control method provided by an embodiment of the present application in conjunction with specific implementation methods. Figure 2 This is a flow chart of a range hood control method provided in an embodiment of the present application, such as Figure 2 The specific steps are as follows:

[0046] Step 201: During the self-cleaning process, obtain the current fan gear and current water output of the range hood.

[0047] In practice, based on the above discussion, during the self-cleaning process of the range hood, the centrifugal force and suction force exerted on the water droplets on the fan impeller are related to the fan gear position. At the same time, the gravity and centrifugal force exerted on the water droplets are related to the mass of the water droplets, and the mass of the water droplets is related to the water output of the water pump. Among them, the water output of the water pump is the water output per unit time (for example, 1s). Based on this, in order to prevent dripping, the range hood needs to determine the force exerted on the water droplets on the fan impeller, and it is necessary to obtain the current fan gear position and current water output of the range hood.

[0048] Step 202, in the pre-stored correspondence between the fan gear, fan speed and fan power, query the current fan speed and current fan power corresponding to the current fan gear, and based on the pre-stored air volume-wind pressure-power curve, query the current wind pressure corresponding to the current fan power.

[0049] In practice, the range hood may pre-store a correspondence between fan position, fan speed, and fan power. This correspondence may be determined by a technician measuring the range hood before it leaves the factory. After the range hood obtains the current fan position, it may further query the pre-stored correspondence between fan position, fan speed, and fan power to determine the current fan speed and current fan power corresponding to the current fan position.

[0050] The range hood may be pre-stored with an air volume-air pressure-power curve, wherein the air volume-air pressure-power curve may also be obtained by a technician measuring the range hood before the range hood leaves the factory. Figure 4 This is an air volume-air pressure-power curve provided in an embodiment of the present application. After the range hood has queried the current fan power, it can further query the current air pressure corresponding to the current fan power based on the pre-stored air volume-air pressure-power curve.

[0051] Step 203 : determining the current centrifugal force exerted on the water droplets on the fan impeller according to the current water output, the current fan speed, the pre-stored number of fan impellers, and the fan impeller radius.

[0052] In practice, the range hood may pre-store the number of fan impellers and the fan impeller radius. After obtaining the current water output and the current fan speed, the range hood may further determine the current centrifugal force acting on the water droplets on the fan impeller based on the current water output, the current fan speed, and the pre-stored number of fan impellers and fan impeller radius.

[0053] Optionally, the range hood determines the current centrifugal force exerted on the water droplets on the fan impeller according to the current water output, the current fan speed, the pre-stored number of fan impellers, and the fan impeller radius, using the formula (1):

[0054]

[0055] Among them, F represents the current centrifugal force on the water droplet, and M represents the current water output, in m 2 / s, n represents the number of fan impellers, V represents the current fan speed, and R represents the fan impeller radius.

[0056] In practice, the centrifugal force F = am applied to the water droplets on the fan impeller as the fan impeller rotates. Here, m represents the mass of the water droplets on a single fan impeller, and a represents the centripetal acceleration. The direction of the centrifugal force is along the radius away from the center of the circle. a = ω 2 R=(V 2 ) / R. Where ω represents the angular velocity of the fan impeller, R represents the radius of the fan impeller, and V represents the fan speed.

[0057] When the fan impeller rotates at a constant speed according to the fan speed V, the water pumped out by the water pump can be considered to be evenly sprayed on each fan impeller of the fan. Then the centrifugal force F = m*(V 2 ) / R. Among them, m=M / n, M represents the current water output, the unit is m 2 / s, n represents the number of fan impellers.

[0058] Step 204 : determining the current suction force exerted on the water droplets on the fan impeller according to the current wind pressure and the pre-stored fan impeller area.

[0059] In implementation, the range hood may pre-store the fan impeller area. This refers to the area of ​​a single fan impeller. After obtaining the current wind pressure, the range hood can further determine the current suction force on water droplets on the fan impeller based on the current wind pressure and the pre-stored fan impeller area. The current suction force is perpendicular to the current centrifugal force.

[0060] Optionally, the range hood determines the current suction force on the water droplets on the fan impeller according to the current wind pressure and the pre-stored fan impeller area using the formula (2):

[0061]

[0062] Among them, f represents the current suction force on the water droplet, P represents the current wind pressure, and S represents the fan impeller area.

[0063] In practice, as the fan impellers rotate at a constant speed V, the water pumped out by the water pump can be considered to be evenly sprayed onto each impeller of the fan. Accordingly, according to the pressure formula P = fS, the current suction force on the water droplets on the fan impellers is f = P / S.

[0064] Step 205 : determining the current resultant force exerted on the water droplets on the fan impeller in the opposite direction of gravity according to the current centrifugal force, the current suction force and the pre-stored fan inclination angle.

[0065] During implementation, after the range hood determines the current centrifugal force and the current suction, it can further determine the current resultant force on the water droplets on the fan impeller in the opposite direction of gravity based on the current centrifugal force, the current suction and the pre-stored fan inclination angle.

[0066] Optionally, the range hood determines the current resultant force on the water droplets on the fan impeller in the opposite direction of gravity according to the current centrifugal force, the current suction force and the pre-stored fan inclination angle as formula (3):

[0067] F N =Fcosθ+fsinθ Formula (3)

[0068] Among them, F N It represents the current resultant force on the water droplet in the opposite direction of gravity, F represents the current centrifugal force on the water droplet, f represents the current suction force on the water droplet, and θ represents the fan inclination angle.

[0069] In implementation, Figure 4 As shown, the current centrifugal force F on the water droplet is the component force F'=Fcosθ in the opposite direction of gravity, and the current suction force f on the water droplet is the component force f'=fsinθ in the opposite direction of gravity. Then the current resultant force F on the water droplet in the opposite direction of gravity is N =F'+f'=Fcosθ+fsinθ.

[0070] Optionally, the fan inclination angle is the sum of the fan design inclination angle and the range hood installation inclination angle.

[0071] Step 206: If the current resultant force on the water droplets on the fan impeller in the direction opposite to gravity is less than gravity, the current fan gear is increased to a preset gear, and the steps of querying the current fan speed and the current fan power corresponding to the current fan gear are repeated until the current resultant force on the water droplets on the fan impeller in the direction opposite to gravity is greater than or equal to gravity.

[0072] During implementation, after the range hood determines the current resultant force on the water droplets on the fan impeller in the direction opposite to gravity, it can further determine whether the current resultant force on the water droplets on the fan impeller in the direction opposite to gravity is less than gravity. If the current resultant force on the water droplets on the fan impeller in the direction opposite to gravity is less than gravity, it means that the water droplets are dripping due to the influence of gravity, and the range hood will drip during the self-cleaning process. Accordingly, the range hood will increase the current fan gear to a preset gear and repeat step 202 until the current resultant force on the water droplets on the fan impeller in the direction opposite to gravity is greater than or equal to gravity. In this way, after the range hood increases the fan gear of the fan, the fan speed and fan power increase, the centrifugal force and suction force increase, and the resultant force also increases, and eventually becomes greater than or equal to gravity, thereby preventing the range hood from dripping during the self-cleaning process.

[0073] Optionally, if the current resultant force exerted on the water droplets on the fan impeller in the direction opposite to gravity is greater than or equal to gravity, the range hood maintains the current fan gear unchanged.

[0074] In practice, if the current net force acting on water droplets on the fan impeller in the direction opposite to gravity is greater than or equal to gravity, the water droplets are firmly attached to the fan impeller due to the combined force of centrifugal force and suction in the direction opposite to gravity, and the range hood will not drip during the self-cleaning process. Accordingly, the range hood maintains the current fan speed.

[0075] As an optional implementation, in order to ensure that the water pumped out by the water pump can be evenly sprayed on each fan impeller of the fan, when self-cleaning is started, the range hood controls the fan to run for a preset running time according to the preset initial gear, and then controls the water pump to pump water.

[0076] During self-cleaning, the range hood first controls the fan to run at a preset initial gear for a preset duration. After the fan speed reaches the speed corresponding to the preset initial gear, it rotates at a constant speed. At this point, the range hood controls the water pump to pump water, ensuring that the pumped water is evenly sprayed onto each impeller of the fan.

[0077] Figure 5 This is a flow chart of an example of a range hood control method provided in an embodiment of the present application, such as Figure 5 The specific steps are as follows.

[0078] Step 501 , when self-cleaning is started, the range hood controls the fan to run for a preset running time according to a preset initial gear, and then controls the water pump to pump water.

[0079] Step 502: During the self-cleaning process, the current fan gear and current water output of the range hood are obtained.

[0080] Step 503 : In the pre-stored correspondence between the fan gear, the fan speed and the fan power, query the current fan speed and the current fan power corresponding to the current fan gear.

[0081] Step 504 : Based on the pre-stored wind volume-wind pressure-power curve, query the current wind pressure corresponding to the current wind turbine power.

[0082] Step 505 : determining the current centrifugal force exerted on the water droplets on the fan impeller according to the current water output, the current fan speed, the pre-stored number of fan impellers, and the fan impeller radius.

[0083] Step 506 : Determine the current suction force on the water droplets on the fan impeller according to the current wind pressure and the pre-stored fan impeller area.

[0084] Step 507 : Determine the current resultant force on the water droplets on the fan impeller in the opposite direction of gravity based on the current centrifugal force, the current suction force, and the pre-stored fan inclination angle.

[0085] Step 508: Determine whether the current resultant force acting on the water droplets on the fan impeller in the direction opposite to gravity is less than gravity. If so, proceed to step 509 and repeat step 503. If so, proceed to step 510.

[0086] Step 509: Increase the current fan gear to a preset gear.

[0087] Step 510: Maintain the current fan gear position unchanged.

[0088] The present application provides a control method for a range hood. During the self-cleaning process, the range hood obtains the current fan gear and the current water output. Then, the range hood queries the current fan speed and the current fan power corresponding to the current fan gear in the pre-stored correspondence between the fan gear, the fan speed and the fan power, and queries the current wind pressure corresponding to the current fan power based on the pre-stored wind volume-wind pressure-power curve. Then, the range hood determines the current centrifugal force on the water droplets on the fan impeller based on the current water output, the current fan speed, the pre-stored number of fan impellers and the fan impeller radius, and determines the current suction on the water droplets on the fan impeller based on the current wind pressure and the pre-stored fan impeller area. Afterwards, the range hood determines the current resultant force on the water droplets on the fan impeller in the opposite direction of gravity based on the current centrifugal force, the current suction and the pre-stored fan inclination angle. Finally, if the current net force acting on the water droplets on the fan impeller in the direction opposite to gravity is less than gravity, the range hood increases the current fan gear to a preset gear and repeats the steps of querying the current fan speed and current fan power corresponding to the current fan gear until the current net force acting on the water droplets on the fan impeller in the direction opposite to gravity is greater than or equal to gravity. In this way, by adjusting the range hood gear during the range hood's self-cleaning process, the current net force acting on the water droplets on the range hood's fan impeller in the direction opposite to gravity is greater than or equal to gravity, thereby preventing the range hood from dripping during the self-cleaning process.

[0089] It should be understood that although Figure 2 and Figure 5 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. In addition, Figure 2 and Figure 5 At least part of the steps may include multiple steps or multiple stages. These steps or stages are not necessarily performed at the same time, but can be performed at different times. The order of execution of these steps or stages is not necessarily one by one, but can be performed in turn or alternately with other steps or at least part of the steps or stages in other steps.

[0090] It can be understood that the same / similar parts between the various embodiments of the above method in this specification can be referred to each other, and each embodiment focuses on the differences from other embodiments. For related parts, please refer to the description of other method embodiments.

[0091] The embodiment of the present application also provides a range hood, such as Figure 6 As shown, the range hood includes a main control device 610, a fan 620 and a water pump 630; wherein,

[0092] The main control device 610 is used to obtain the current fan gear position of the range hood fan 620 and the current water output of the water pump 630 during the self-cleaning process;

[0093] The main control device 610 is used to query the current fan speed and current fan power corresponding to the current fan gear in the pre-stored correspondence between the fan gear, the fan speed, and the fan power, and query the current wind pressure corresponding to the current fan power based on the pre-stored wind volume-wind pressure-power curve;

[0094] The main control device 610 is used to determine the current centrifugal force on the water droplets on the fan impeller based on the current water output, the current fan speed, the pre-stored number of fan impellers and the fan impeller radius;

[0095] The main control device 610 is used to determine the current suction force on the water droplets on the fan impeller based on the current wind pressure and the pre-stored fan impeller area;

[0096] The main control device 610 is used to determine the current resultant force on the water droplets on the fan impeller in the direction opposite to the gravity based on the current centrifugal force, the current suction force and the pre-stored fan tilt angle;

[0097] The main control device 610 is used to increase the current fan gear of the fan 620 to a preset gear if the current resultant force acting on the water droplets on the fan impeller in the direction opposite to gravity is less than gravity, and repeatedly execute the steps of querying the current fan speed and the current fan power corresponding to the current fan gear until the current resultant force acting on the water droplets on the fan impeller in the direction opposite to gravity is greater than or equal to gravity.

[0098] As an optional implementation, the main control device 610 is configured to maintain the current fan gear of the fan 620 unchanged if the current resultant force acting on the water droplets on the fan impeller in the opposite direction of gravity is greater than or equal to gravity.

[0099] As an optional embodiment, the main control device 610 is used to control the fan 620 to run for a preset running time according to a preset initial gear when self-cleaning is started, and then control the water pump 630 to pump water.

[0100] As an optional implementation, the fan inclination angle is the sum of the design inclination angle of the fan 620 and the installation inclination angle of the range hood.

[0101] For specific definitions of the range hood, please refer to the definitions of the range hood control method above and will not be repeated here. Each module in the range hood described above can be implemented in whole or in part through software, hardware, or a combination thereof. Each of the modules described above can be embedded in or independent of a processor in a computer device in hardware form, or can be stored in a memory in a computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0102] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0103] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0104] It should also be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for display, data for analysis, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0105] Each embodiment in this specification is described in a related manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences between the other embodiments. In particular, the system embodiment is generally similar to the method embodiment, so the description is relatively simple. For related parts, refer to the description of the method embodiment.

[0106] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0107] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A range hood control method, characterized in that: The method comprises: During the self-cleaning process, obtain the current fan gear and current water output of the range hood; In the pre-stored correspondence between the fan gear, the fan speed and the fan power, query the current fan speed and the current fan power corresponding to the current fan gear, and query the current wind pressure corresponding to the current fan power based on the pre-stored wind volume-wind pressure-power curve; Determining a current centrifugal force on water droplets on the fan impeller according to the current water output, the current fan speed, the pre-stored number of fan impellers, and the fan impeller radius; determining a current suction force exerted on the water droplets on the fan impeller according to the current wind pressure and a pre-stored fan impeller area; Determining a current resultant force on the water droplets on the fan impeller in a direction opposite to gravity based on the current centrifugal force, the current suction force, and a pre-stored fan inclination angle; If the current resultant force acting on the water droplets on the fan impeller in the direction opposite to gravity is less than gravity, the current fan gear is increased to a preset gear, and the steps of querying the current fan speed and the current fan power corresponding to the current fan gear are repeated until the current resultant force acting on the water droplets on the fan impeller in the direction opposite to gravity is greater than or equal to gravity.

2. The method according to claim 1, characterized in that If the current resultant force exerted on the water droplets on the fan impeller in the opposite direction of gravity is greater than or equal to gravity, the current fan gear position is maintained unchanged.

3. The method according to claim 1, characterized in that The formula for determining the current centrifugal force exerted on the water droplets on the fan impeller based on the current water output, the current fan speed, the pre-stored number of fan impellers, and the fan impeller radius is: Among them, F represents the current centrifugal force on the water droplet, and M represents the current water output, in m 2 / s, n represents the number of fan impellers, V represents the current fan speed, and R represents the fan impeller radius.

4. The method according to claim 1, wherein The formula for determining the current suction force on the water droplets on the fan impeller based on the current wind pressure and the pre-stored fan impeller area is: Among them, f represents the current suction force on the water droplet, P represents the current wind pressure, and S represents the fan impeller area.

5. The method according to claim 1, wherein The formula for determining the current resultant force on the water droplets on the fan impeller in the opposite direction of gravity based on the current centrifugal force, the current suction force and the pre-stored fan inclination angle is: F N =Fcosθ+fsinθ Among them, F N It represents the current resultant force on the water droplet in the opposite direction of gravity, F represents the current centrifugal force on the water droplet, f represents the current suction force on the water droplet, and θ represents the fan inclination angle.

6. The method according to claim 1, characterized in that The method further comprises: When self-cleaning is started, the fan is controlled to run for a preset running time according to the preset initial gear, and then the water pump is controlled to pump water.

7. The method according to claim 1, characterized in that The fan inclination angle is the sum of the fan design inclination angle and the range hood installation inclination angle.

8. A range hood, characterized in that: The range hood includes a main control device, a fan and a water pump; wherein, The main control device is used to obtain the current fan gear position of the fan of the range hood and the current water output of the water pump during the self-cleaning process; The main control device is used to query the current fan speed and current fan power corresponding to the current fan gear in the pre-stored correspondence between the fan gear, the fan speed and the fan power, and query the current wind pressure corresponding to the current fan power based on the pre-stored wind volume-wind pressure-power curve; The main control device is used to determine the current centrifugal force exerted on the water droplets on the fan impeller according to the current water output, the current fan speed, the pre-stored number of fan impellers and the fan impeller radius; The main control device is used to determine the current suction force exerted on the water droplets on the fan impeller according to the current wind pressure and the pre-stored fan impeller area; The main control device is used to determine the current resultant force exerted on the water droplets on the fan impeller in the opposite direction of gravity based on the current centrifugal force, the current suction force and the pre-stored fan inclination angle; The main control device is used to increase the current fan gear of the fan to a preset gear if the current resultant force acting on the water droplets on the fan impeller in the opposite direction of gravity is less than gravity, and repeatedly execute the steps of querying the current fan speed and the current fan power corresponding to the current fan gear until the current resultant force acting on the water droplets on the fan impeller in the opposite direction of gravity is greater than or equal to gravity.

9. The range hood according to claim 8, characterized in that: The main control device is used to maintain the current fan gear of the fan unchanged if the current resultant force exerted on the water droplets on the fan impeller in the opposite direction of gravity is greater than or equal to gravity.

10. The range hood according to claim 8, characterized in that: The main control device is used to control the fan to run for a preset running time according to a preset initial gear when self-cleaning is started, and then control the water pump to pump water.

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