Fan system, range hood, and self-cleaning method for range hood

Abstract

The present invention relates to a fan system comprising: a volute; an impeller disposed within the volute; and a motor comprising a stator and a rotor mounted on the outer periphery of the stator, with both ends of the stator constrained to the volute and the rotor drivingly connected to the impeller for driving the impeller. The system is characterized by further comprising: at least two pressure sensors spaced circumferentially around the outer periphery of the stator, with the sensing ends of the pressure sensors abutting against the inner circumferential wall of the rotor; and a controller electrically connected to each pressure sensor for determining, based on the detection results of each pressure sensor, the static pressure difference when the impeller is stationary and / or the dynamic pressure difference when the impeller is rotating, to determine whether the impeller needs cleaning. Also disclosed are a range hood and a self-cleaning method for the range hood. The pressure difference reflects the oil contamination status of the impeller, thereby controlling a cleaning mechanism to clean the fan system. The self-cleaning method for the range hood can also detect whether the impeller is clean after cleaning.

Description

Technical Field

[0001] The present invention relates to the technical field of oil fume purification, and in particular to a fan system, a range hood and a self-cleaning method for the range hood. Background Art

[0002] Range hoods have become an indispensable kitchen appliance in modern homes. The fan system in existing range hoods consists of a volute, an impeller housed within the volute, and a motor that drives the impeller. Under the negative pressure generated by the fan, cooking fumes are drawn in through the air inlet and expelled through the air outlet, thus purifying the kitchen air.

[0003] Since the oil smoke needs to be processed by the fan system before being discharged, it will inevitably cause the impeller and the inner wall of the volute of the fan to be stained with oil, which will accumulate over a long period of time to form oil and dirt. In particular, excessive accumulation of oil and dirt in the impeller will block the air inlet channel between the blades on the impeller. If it is not cleaned regularly, the performance of the range hood will be reduced.

[0004] The most common existing method is to monitor the cumulative operating hours of the range hood and, after a certain period of use, prompt the user to clean the hood or activate the self-cleaning device to clean it. However, due to different cooking habits, the amount of oil smoke produced also varies. Cooking methods that produce more oil smoke over the same period of time will accumulate more oil than those that produce less oil smoke. Therefore, this cleaning method does not accurately reflect the accumulation of oil stains.

[0005] A Chinese invention patent application with application number CN201611003831.X (application publication number CN106439975A) discloses a range hood with a weighing sensor cleaning reminder function and a cleaning reminder method thereof. This method uses a weighing sensor to detect changes in the weight of accumulated oil in the range hood, compares the weighing sensor's data signal with a controller setting value, and when the set value is reached, the controller instructs the corresponding functional module to implement the cleaning alarm and cleaning function. However, the weighing sensor in this method detects changes in the weight of accumulated oil in the range hood, rather than the weight of the oil on the impeller. Therefore, this method does not detect the oil contamination of the impeller. Summary of the Invention

[0006] The first technical problem to be solved by the present invention is to provide a fan system capable of detecting the oil pollution status of the impeller in response to the above-mentioned prior art.

[0007] The second technical problem to be solved by the present invention is to provide a range hood having the above-mentioned fan system.

[0008] The third technical problem to be solved by the present invention is to provide a self-cleaning method for the above-mentioned range hood, which can perform self-cleaning of the impeller according to the oil pollution state of the impeller.

[0009] The fourth technical problem to be solved by the present invention is to provide a self-cleaning method for the above-mentioned range hood, which can detect whether the impeller is clean.

[0010] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a fan system, comprising:

[0011] volute;

[0012] An impeller is provided in the volute;

[0013] The motor includes a stator and a rotor sleeved on the outer periphery of the stator, wherein both ends of the stator are constrained on the volute, and the rotor is connected to the impeller for driving the impeller to rotate;

[0014] It is characterized by: further comprising:

[0015] At least two pressure sensors are circumferentially spaced and distributed around the outer periphery of the stator, with sensing ends of the pressure sensors abutting against the inner circumferential wall of the rotor;

[0016] The controller is electrically connected to each pressure sensor and is used to obtain the static pressure difference when the impeller is stationary and / or the dynamic pressure difference when the impeller is rotating according to the detection results of each pressure sensor to determine whether the impeller needs to be cleaned.

[0017] In order to achieve the installation of the stator, the volute includes a front cover plate, a rear cover plate and an annular wall connecting the front cover plate and the rear cover plate. The stator is arranged along the front and rear extension direction of the annular wall. The stator includes a columnar main body and two stator shafts respectively located at both ends of the main body. Each stator shaft is respectively installed on the front cover plate and the rear cover plate through corresponding fixing brackets.

[0018] In order to fix the two stator shafts, each fixing bracket includes a connecting portion located in the middle and at least three bracket arms arranged radially with the connecting portion as the center. The connecting portion is provided with a socket for inserting the corresponding stator shaft.

[0019] In order to achieve smooth rotation of the rotor, the rotor is annular, and a bearing is provided in the center of the rotor to fit the inner wall thereof. The bearing is sleeved on the outer periphery of the main body, and a gap is left between the inner circumferential wall of the rotor at least one end away from the bearing and the main body of the stator.

[0020] In order to ensure that the pressure sensor does not affect the rotation of the rotor relative to the stator when the pressure sensor abuts against the rotor, the pressure sensor is arranged on the outer periphery of the main body and is located in the above-mentioned gap.

[0021] In order to realize the rotor driving the impeller to rotate, the impeller includes a center disk, a central depression of the center disk is formed with a recessed portion for an end portion of the rotor to abut against, and the recessed portion is provided with a through hole for the stator to pass through.

[0022] In order to improve the pressure detection accuracy of the pressure sensor, the pressure sensor has a V-shaped sensing end, with the tip of the V facing the rotor and abutting against the rotor.

[0023] In order to improve the accuracy of the impeller cleaning judgment, there are two pressure sensors installed on the outer periphery of the stator at an interval of 180 degrees.

[0024] The technical solution adopted by the present invention to solve the second technical problem is: a range hood having the above-mentioned fan system includes a fan frame, and is characterized in that: the fan system is arranged in the fan frame.

[0025] In order to achieve self-cleaning of the fan system, a cleaning mechanism connected to the controller is also included. The controller is configured to control whether the cleaning mechanism cleans the fan system according to the pressure detection result signal of the pressure sensor.

[0026] Preferably, the cleaning mechanism comprises:

[0027] pipeline;

[0028] a nozzle, connected to the pipeline and arranged toward the impeller;

[0029] The water outlet valve is provided between the pipeline and the nozzle and is electrically connected to the controller, and is used for controlling whether the nozzle discharges water according to a control signal of the controller.

[0030] In order to store cleaning water, the cleaning mechanism also includes a water tank arranged in the fan rack or placed on the top of the fan rack. The water tank is connected to a water inlet pipe, and the above-mentioned pipe is connected to the water outlet of the water tank.

[0031] The technical solution adopted by the present invention to solve the third technical problem is: a self-cleaning method for a range hood as described above, wherein the two pressure sensors are defined as a first pressure sensor and a second pressure sensor, and the method is characterized by comprising the following steps:

[0032] Step 1: When the range hood is in a standby state, obtain pressure values collected by the first pressure sensor and the second pressure sensor when the impeller is in a stationary state;

[0033] Step 2: Calculate the pressure difference between the first pressure sensor and the second pressure sensor when the impeller is stationary to obtain a static pressure difference ΔF, and determine whether ΔF is greater than a first preset threshold F1. If so, proceed to step 3; if not, proceed to step 6.

[0034] Step 3: Start the motor and obtain the pressure values collected by the first pressure sensor and the second pressure sensor when the impeller is rotating after the motor has been working for a preset time of t seconds;

[0035] Step 4: Calculate the pressure difference between the first pressure sensor and the second pressure sensor when the impeller is rotating to obtain a dynamic pressure difference ΔF', and determine whether ΔF' is greater than a second preset threshold F2. If so, it indicates that the impeller needs to be cleaned, and the process proceeds to step 5; if not, the process proceeds to step 6;

[0036] Step 5: The controller controls the cleaning mechanism to work, and after the impeller cleaning is completed, the process proceeds to step 6;

[0037] Step 6: The range hood enters normal working state.

[0038] The technical solution adopted by the present invention to solve the fourth technical problem is: after the cleaning mechanism starts working in step 5, the following steps are further included:

[0039] Step 5-1: After the cleaning mechanism completes a cleaning cycle, the cleaning cycle N is incremented by 1. The initial value of the cleaning cycle N is 0.

[0040] Step 5-2: Determine whether the current cleaning cycle N is greater than a preset value n. If so, control the motor to start to blow away the residual cleaning water, obtain the pressure values collected by the first pressure sensor and the second pressure sensor when the impeller is rotating, and then proceed to step 5-3; if not, continue to the next cleaning cycle and proceed to step 5-1;

[0041] Step 5-3: Calculate the pressure difference between the first pressure sensor and the second pressure sensor when the impeller is rotating to obtain a dynamic pressure difference ΔF', and determine whether ΔF' is greater than a second preset threshold F2. If so, it indicates that the impeller is not clean, and step 5 is repeated; if not, proceed to step 5-4;

[0042] Step 5-4, control the motor to stop, obtain the pressure values collected by the first pressure sensor and the second pressure sensor when the impeller is stationary, and calculate the pressure difference between the first pressure sensor and the second pressure sensor when the impeller is stationary to obtain the static pressure difference ΔF, and determine whether ΔF is greater than the first preset threshold F1. If so, it means that the impeller is not clean, and re-execute step 5; if not, the impeller cleaning is completed.

[0043] Compared to existing technologies, the present invention offers advantages in that, through at least two pressure sensors positioned against the inner circumference of the rotor, it can detect the static pressure differential when the impeller is stationary and / or the dynamic pressure differential when the impeller is rotating, thereby determining whether the impeller requires cleaning. This fan system can reflect the oil contamination status of the impeller through the pressure differential, thereby controlling the cleaning mechanism to clean the fan system. Furthermore, the range hood's self-cleaning method can also detect the cleanliness of the impeller after cleaning. Therefore, this method provides high accuracy in detecting impeller oil contamination, is simple, and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 Schematic diagram of the structure of the range hood according to an embodiment of the present invention (the front panel of the fan frame is omitted);

[0045] Figure 2 for Figure 1 Schematic diagram of the structure of the blower system;

[0046] Figure 3 for Figure 2 sectional view of

[0047] Figure 4 for Figure 2 Exploded view of

[0048] Figure 5 for Figure 2 Schematic diagram of part of the structure;

[0049] Figure 6 for Figure 2 Schematic diagram of the motor structure with a pressure sensor installed;

[0050] Figure 7 for Figure 1 Schematic diagram of the structure of the cleaning mechanism;

[0051] Figure 8 is a flow chart of a self-cleaning method for a range hood according to an embodiment of the present invention;

[0052] Figure 9 4 is a flowchart of the working process of the cleaning mechanism in an embodiment of the present invention. DETAILED DESCRIPTION

[0053] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0054] like Figure 1 As shown, a range hood includes a fan frame 8, a fan system, and a cleaning mechanism 9. The fan system is disposed within the fan frame 8 and is a centrifugal fan. In this embodiment, the fan system is used in a range hood. Alternatively, the fan system can also be used in any other application requiring such a power device.

[0055] like Figures 2 to 6 As shown, the fan system in this embodiment includes a volute 1, an impeller 2 arranged in the volute 1, a motor 3, a pressure sensor 4 and a controller (not shown in the figure). The motor 3 includes a stator 31 and a rotor 32 mounted on the outer periphery of the stator 31. The two ends of the stator 31 are constrained on the volute 1. The rotor 32 is connected to the impeller 2 for driving the impeller 2 to rotate. There are at least two pressure sensors 4, which are distributed at intervals along the circumference of the stator 31. The sensing end of the pressure sensor 4 is against the inner wall of the rotor 32. The controller is electrically connected to each pressure sensor 4 and is used to obtain the static pressure difference when the impeller 2 is stationary and / or the dynamic pressure difference when the impeller 2 is rotating based on the detection results of each pressure sensor 4 to determine whether the impeller 2 needs to be cleaned.

[0056] like Figure 4 As shown, the volute 1 includes a front cover plate 11, a rear cover plate 12 and an annular wall 13 connecting the front cover plate 11 and the rear cover plate 12. The stator 31 is arranged along the front-to-back extension direction of the annular wall 13. The stator 31 includes a columnar main body 311 and two stator shafts respectively located at both ends of the main body 311. The front cover plate 11 and the rear cover plate 12 of the volute 1 are also respectively connected to fixed brackets, corresponding to the first fixed bracket 51 and the second fixed bracket 52. In this embodiment, the two stator shafts are the first stator shaft 312 and the second stator shaft 313, respectively. The first stator shaft 312 and the second stator shaft 313 are respectively mounted on the front cover plate 11 and the rear cover plate 12 through the corresponding first fixed bracket 51 and the second fixed bracket 52. The fan system can be single-inlet or double-inlet. The structure of the above-mentioned fan system is the same as that of the prior art and will not be repeated here.

[0057] like Figure 4 As shown, the first fixing bracket 51 and the second fixing bracket 52 have the same structure, both including a central connecting portion and at least three bracket arms 502 arranged radially from the connecting portion. The connecting portion is provided with a socket 501 for inserting the corresponding first stator shaft 312 and second stator shaft 313. The other ends of the first stator shaft 312 and second stator shaft 313 are respectively locked by nuts 53. Of course, the structures of the first fixing bracket 51 and the second fixing bracket 52 can also be different, as long as they can maintain the installation of the first stator shaft 312 and second stator shaft 313.

[0058] like Figure 3 and Figure 6 As shown, the rotor 32 is annular, and a bearing 6 is provided in the center of the rotor 32 to fit the inner wall thereof. The bearing 6 is a rolling bearing and is sleeved on the outer periphery of the main body 311. A gap 7 is left between the inner peripheral wall of the rotor 32 at least one end away from the bearing 6 and the main body 311 of the stator 31. In order to realize that the rotor 32 drives the impeller 2 to rotate, as shown in FIG. Figure 3As shown, the impeller 2 includes a center plate 21. The specific structure and installation method of the center plate 21 are the same as those of existing range hoods and will not be repeated here. The center of the center plate 21 is recessed to form a recessed portion 210 for abutting one end of the rotor 32. The rotor 32 is fixed to the center plate 21. The recessed portion 210 is provided with a through hole 220 for the stator 31 to pass through. In addition, the pressure sensor 4 is arranged on the outer periphery of the main body 311 and is located in the above-mentioned gap 7. Figure 3 As shown in FIG, the pressure sensor 4 is provided at one end of the rotor 32 away from the center disk 21 .

[0059] like Figure 6 As shown, in this embodiment, the pressure sensor 4 has a V-shaped sensing end, with the tip of the V facing the rotor 32 and abutting against it. This V-shaped tip ensures contact with the rotor 32, thereby improving the detection performance of the pressure sensor 4. The V-shaped sensing end of the pressure sensor 4 is otherwise identical to the sensing end of pressure sensors in the prior art, differing only in shape. In this embodiment, two pressure sensors 4 are mounted 180° apart on the outer circumference of the stator 31. Because the stator 31 is cylindrical, the pressure sensors 4, mounted 180° apart, can achieve a corresponding pressure difference between the upper and lower halves of the impeller 2.

[0060] The cleaning mechanism 9 is connected to the controller, which is configured to control the cleaning mechanism 9 to clean the fan system according to the pressure detection result signal of the pressure sensor 4. Figure 7 As shown, the cleaning mechanism 9 in this embodiment includes a pipe 91, a nozzle 92, and a water outlet valve 93. The nozzle 92 is connected to the pipe 91 and is positioned toward the impeller 2. The water outlet valve 93 is located between the pipe 91 and the nozzle 92 and is electrically connected to the controller, controlling whether the nozzle 92 discharges water based on a control signal from the controller. Furthermore, the cleaning mechanism 9 includes a water tank 94 located within or mounted on top of the fan frame 8. The water tank 94 is connected to a water inlet pipe 95, and the pipe 91 is connected to the water outlet of the water tank 94.

[0061] like Figure 8 As shown, the two pressure sensors 4 are defined as a first pressure sensor and a second pressure sensor respectively. The self-cleaning method of the range hood in this embodiment includes the following steps:

[0062] Step 1: When the range hood is in a standby state, obtain pressure values collected by the first pressure sensor and the second pressure sensor when the impeller is in a stationary state;

[0063] Step 2: Calculate the pressure difference between the first pressure sensor and the second pressure sensor when the impeller is stationary to obtain a static pressure difference ΔF, and determine whether ΔF is greater than a first preset threshold F1. If so, proceed to step 3; if not, proceed to step 6.

[0064] Step 3: Start the motor and, after a preset time t seconds of motor operation, obtain the pressure values collected by the first pressure sensor and the second pressure sensor when the impeller is rotating. The preset time t seconds in this step is to ensure that the pressure value is collected only after the motor is running stably. The specific value of t is obtained based on experience or experiments.

[0065] Step 4: Calculate the pressure difference between the first pressure sensor and the second pressure sensor when the impeller is rotating to obtain a dynamic pressure difference ΔF', and determine whether ΔF' is greater than a second preset threshold F2. If so, it indicates that the impeller needs to be cleaned, and the process proceeds to step 5; if not, the process proceeds to step 6;

[0066] Step 5: The controller controls the cleaning mechanism to work, and after the impeller cleaning is completed, the process proceeds to step 6;

[0067] Step 6: The range hood enters normal working state.

[0068] The above self-cleaning method is that after the range hood enters the standby state, the controller automatically performs the cleanliness detection of the impeller cleaning or the user manually operates the controller to perform the cleanliness detection of the impeller cleaning. The specific detection process of the cleanliness detection is as shown in steps 1 to 4 above.

[0069] Although the impeller is cleaned in step 5 above, it is not clear whether the cleanliness of the impeller meets the standard. Figure 9 As shown, after the cleaning mechanism starts working in step 5, the following steps are also included:

[0070] Step 5-1: After the cleaning mechanism completes a cleaning cycle, the cleaning cycle N is incremented by 1. The initial value of the cleaning cycle N is 0.

[0071] In this embodiment, the method for determining whether the cleaning mechanism has completed a cleaning cycle is as follows: when the cleaning mechanism is turned on for a preset time T, it is determined that a cleaning cycle has been completed; when the cleaning mechanism is working, water or cleaning liquid is sprayed onto the impeller rotating at a low speed through the nozzle;

[0072] Step 5-2: Determine whether the current cleaning cycle N is greater than a preset value n. If so, control the motor to start to blow away the residual cleaning water. After the motor operates for t1 seconds (i.e., the residual water is basically or completely blown away), obtain the pressure values collected by the first pressure sensor and the second pressure sensor when the impeller is rotating, and proceed to step 5-3. If not, continue to the next cleaning cycle and proceed to step 5-1.

[0073] Step 5-3: Calculate the pressure difference between the first pressure sensor and the second pressure sensor when the impeller is rotating to obtain a dynamic pressure difference ΔF', and determine whether ΔF' is greater than a second preset threshold F2. If so, it indicates that the impeller is not clean, and step 5 is repeated; if not, proceed to step 5-4;

[0074] Step 5-4: Control the motor to stop, obtain the pressure values collected by the first and second pressure sensors when the impeller is stationary, and calculate the pressure difference between the first and second pressure sensors when the impeller is stationary to obtain a static pressure difference ΔF. Determine whether ΔF is greater than a first preset threshold F1. If so, it indicates that the impeller is not clean, and step 5 is repeated. If not, the impeller cleaning is complete. The time for the first preset threshold F1 and the second preset threshold F2 can be adaptively adjusted based on the actual installation location of the pressure sensors.

Claims

1. A fan system comprising: volute (1); An impeller (2) is disposed in the volute (1); The motor (3) comprises a stator (31) and a rotor (32) sleeved on the outer periphery of the stator (31), wherein both ends of the stator (31) are constrained on the volute (1), and the rotor (32) is drivingly connected to the impeller (2) for driving the impeller (2) to rotate; It is characterized by: further comprising: There are at least two pressure sensors (4) distributed at intervals along the circumferential direction on the outer periphery of the stator (31), and the sensing ends of the pressure sensors (4) abut against the inner peripheral wall of the rotor (32); A controller is electrically connected to each pressure sensor (4) and is used to obtain the static pressure difference when the impeller (2) is stationary and / or the dynamic pressure difference when the impeller (2) is rotating based on the detection results of each pressure sensor (4) to determine whether the impeller (2) needs to be cleaned.

2. The fan system according to claim 1, characterized in that: The volute (1) comprises a front cover plate (11), a rear cover plate (12) and an annular wall (13) connecting the front cover plate (11) and the rear cover plate (12); the stator (31) is arranged along the front-to-back extension direction of the annular wall (13); the stator (31) comprises a columnar main body (311) and two stator shafts (312, 313) respectively located at both ends of the main body (311); each stator shaft (312, 313) is respectively mounted on the front cover plate (11) and the rear cover plate (12) via corresponding fixing brackets (51, 52).

3. The fan system according to claim 2, characterized in that: Each fixed bracket (51, 52) comprises a connecting portion in the middle and at least three bracket arms (502) arranged radially with the connecting portion as the center. The connecting portion is provided with a socket (501) for inserting a corresponding stator shaft (312, 313).

4. The fan system according to claim 2, characterized in that: The rotor (32) is annular, and a bearing (6) is provided in the center of the rotor (32) and is arranged in contact with the inner wall thereof. The bearing (6) is sleeved on the outer periphery of the main body (311), and a gap (7) is left between the inner peripheral wall of the rotor (32) at least one end away from the bearing (6) and the main body (311) of the stator (31).

5. The fan system according to claim 4, characterized in that: The pressure sensor (4) is arranged on the outer periphery of the main body (311) and is located in the above-mentioned gap (7).

6. The fan system according to claim 5, characterized in that: The impeller (2) includes a center disk (21), a central depression of the center disk (21) forming a recessed portion (210) for abutting against one end portion of the rotor (32), and a through hole (220) for the stator (31) to pass through the recessed portion (210).

7. The fan system according to any one of claims 1 to 6, characterized in that: The pressure sensor (4) has a V-shaped sensing end, with the tip of the V facing the rotor (32) and abutting against the rotor (32).

8. The fan system according to claim 7, characterized in that: There are two pressure sensors (4) installed on the outer periphery of the stator (31) at intervals of 180 degrees.

9. A range hood having a fan system according to any one of claims 1 to 8, comprising a fan frame (8), characterized in that: The fan system is arranged in the fan frame (8).

10. The range hood according to claim 9, characterized in that: It also includes a cleaning mechanism (9) connected to the controller, and the controller is configured to control whether the cleaning mechanism (9) cleans the fan system according to the pressure detection result signal of the pressure sensor (4).

11. The range hood according to claim 10, characterized in that: The cleaning mechanism (9) comprises: pipeline (91); a nozzle (92) connected to the pipe (91) and disposed toward the impeller (2); The water outlet valve (93) is provided between the pipe (91) and the nozzle (92) and is electrically connected to the controller for controlling whether the nozzle (92) discharges water according to a control signal from the controller.

12. The range hood according to claim 11, characterized in that: The cleaning mechanism (9) further comprises a water tank (94) arranged in the fan frame (8) or placed on the top of the fan frame (8); the water tank (94) is connected to a water inlet pipe (95); and the above-mentioned pipe (91) is connected to the water outlet of the water tank (94).

13. A self-cleaning method for a range hood according to any one of claims 10 to 12, wherein the two pressure sensors are defined as a first pressure sensor and a second pressure sensor, characterized in that The steps include: Step 1: When the range hood is in a standby state, obtain pressure values collected by the first pressure sensor and the second pressure sensor when the impeller is in a stationary state; Step 2: Calculate the pressure difference between the first pressure sensor and the second pressure sensor when the impeller is stationary to obtain a static pressure difference ΔF, and determine whether ΔF is greater than a first preset threshold F1. If so, proceed to step 3. If not, go to step 6; Step 3: Start the motor and obtain the pressure values collected by the first pressure sensor and the second pressure sensor when the impeller is rotating after the motor has been working for a preset time of t seconds; Step 4: Calculate the pressure difference between the first pressure sensor and the second pressure sensor when the impeller is rotating to obtain a dynamic pressure difference ΔF', and determine whether ΔF' is greater than a second preset threshold F2. If so, it indicates that the impeller needs to be cleaned, and the process proceeds to step 5; if not, the process proceeds to step 6; Step 5: The controller controls the cleaning mechanism to work, and after the impeller cleaning is completed, the process proceeds to step 6; Step 6: The range hood enters normal working state.

14. The self-cleaning method according to claim 13, characterized in that: After the cleaning mechanism starts working, step 5 further includes the following steps: Step 5-1: After the cleaning mechanism completes a cleaning cycle, the cleaning cycle N is incremented by 1. The initial value of the cleaning cycle N is 0. Step 5-2: Determine whether the current cleaning cycle N is greater than a preset value n. If so, control the motor to start to blow away the residual cleaning water, obtain the pressure values collected by the first pressure sensor and the second pressure sensor when the impeller is rotating, and then proceed to step 5-3; if not, continue to the next cleaning cycle and proceed to step 5-1; Step 5-3: Calculate the pressure difference between the first pressure sensor and the second pressure sensor when the impeller is rotating to obtain a dynamic pressure difference ΔF', and determine whether ΔF' is greater than a second preset threshold F2. If so, it indicates that the impeller is not clean, and step 5 is repeated; if not, proceed to step 5-4; Step 5-4, control the motor to stop, obtain the pressure values collected by the first pressure sensor and the second pressure sensor when the impeller is stationary, and calculate the pressure difference between the first pressure sensor and the second pressure sensor when the impeller is stationary to obtain the static pressure difference ΔF, and determine whether ΔF is greater than the first preset threshold F1. If so, it means that the impeller is not clean, and re-execute step 5; if not, the impeller cleaning is completed.

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