Range hood and range hood cleaning control method

Abstract

The present invention relates to a range hood and a cleaning control method for the range hood, wherein the range hood comprises: an oil-water collection unit, comprising a first liquid storage tank, for collecting an oil-water mixture flowing down from the range hood; a first turbidity sensor, for detecting the turbidity of the oil-water mixture in the first liquid storage tank; a controller, connected to the first turbidity sensor by electrical signals, for acquiring and recording the turbidity information of the oil-water mixture in the first liquid storage tank and the accumulated running time information of the range hood, and controlling the start of a cleaning program of the range hood when the accumulated running time reaches or exceeds a preset accumulated running time threshold and when the turbidity of the oil-water mixture reaches a preset turbidity threshold. By combining the accumulated running time information and the turbidity information, the oil stain condition on the corresponding internal components of the range hood can be more accurately reflected, so that it can be accurately determined whether the range hood needs to be cleaned, avoiding the problem of missing the best cleaning opportunity and causing excessive accumulation of oil stains.

Description

Technical Field

[0001] The invention relates to the technical field of range hoods, and in particular to a range hood and a cleaning control method for the range hood. Background Art

[0002] A range hood is a kitchen appliance that purifies the kitchen environment. During long-term use, oil and dirt will accumulate inside the range hood and its parts (such as the impeller, volute, etc.). When a large amount of oil and dirt accumulates, it will affect the performance of oil fume extraction. Therefore, it is necessary to clean the oil and dirt on the range hood and its parts in time. Most range hoods use automatic cleaning and oil removal methods such as steam washing and heating. The water pump extracts the liquid in the liquid storage container and heats it in the steam generator. Then, the liquid heated to a certain temperature is directly sprayed onto the parts that need to be cleaned. However, due to the limited volume of the container for water or cleaning liquid, the cleaning effect is limited by the volume of the liquid in the container. Therefore, most of the parts have not been cleaned before the water or cleaning liquid has been consumed. In addition, the cleaning liquid has a short action time and cannot completely decompose the grease on the surface of the parts, and cannot achieve the ideal cleaning effect.

[0003] To this end, the Chinese utility model patent with application number CN201721448982.6 (authorization announcement number CN207438678U) discloses "A cleaning circulation device for a range hood and a range hood". A sewage outlet is provided in the range hood, and the cleaning circulation device of the range hood comprises: a liquid storage container, a heating chamber, a spray arm and a water pump. The liquid storage container is provided with a liquid inlet pipe and a liquid outlet pipe, and the liquid inlet pipe is connected to the sewage outlet; the heating chamber is provided in the range hood to heat the liquid flowing out of the liquid storage container; the spray arm is provided in the range hood and the spray arm is connected to the heating chamber, and the spray arm is used to spray the heated liquid onto the part of the range hood that needs to be cleaned; the water pump is connected between the liquid outlet pipe and the heating chamber, and a filtering device is provided upstream of the water pump. The range hood forms a cleaning liquid circulation system through the cooperation of a liquid storage container, a heating chamber, a spray arm and a water pump, which can avoid being limited by the liquid volume during the cleaning process, thereby improving the cleaning efficiency. In addition, a filtering device is provided upstream of the water pump to prevent impurities in the liquid from entering the water pump or other components.

[0004] However, the range hood in the above patent still has certain deficiencies in actual use. First, the existing range hood basically determines whether to start the cleaning program based on the effective operation time of the range hood. Due to different cooking habits of users, the amount of oil accumulated in the internal components of the range hood is also different during a certain use time of the range hood. For example, if there are more steaming and cooking operations, the amount of oil is relatively small, while if there are more stir-frying and cooking operations, the amount of oil is relatively large. There is also a situation where the range hood continues to run without actual cooking operations. Therefore, if it is only based on whether the range hood reaches the effective operation time to determine whether to start the cleaning program of the range hood, it is unreasonable, and it is difficult to avoid the problem of missing the best cleaning time of the range hood and causing excessive accumulation of oil. Secondly, the cleaning process of the cleaning circulation device in the above patent is generally carried out according to a fixed cleaning time or a fixed number of cleaning times. It cannot be targeted according to the amount of oil on the internal components of the range hood. Therefore, it is easy to have the problem of multiple unnecessary cycle cleanings or insufficient cleaning times resulting in insufficient cleaning effect.

[0005] For the above-mentioned technical solution of determining whether to start the cleaning program based on the effective operating time of the range hood, refer to the patent documents: 1. "A control method and control system for reminding range hoods to automatically clean and" disclosed in application number CN201811203183.1; and 2. "A control method for cleaning range hoods" disclosed in application number CN201910550333.4. Summary of the invention

[0006] The first technical problem to be solved by the present invention is to provide a range hood that can accurately determine the timing of starting a cleaning program for the range hood, thereby avoiding missing the best cleaning opportunity and causing excessive accumulation of oil stains, in response to the current status of the prior art.

[0007] The second technical problem to be solved by the present invention is to provide a cleaning control method for a range hood in view of the current status of the prior art.

[0008] The third technical problem to be solved by the present invention is to provide a cleaning control method for a range hood that can perform targeted cleaning operations according to the oil pollution conditions of the internal components of the range hood in response to the current status of the prior art, so as to avoid the problem of insufficient cleaning effect due to insufficient cleaning times or unnecessary additional multiple cleaning cycles.

[0009] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a range hood, comprising:

[0010] The oil-water collection unit comprises a first liquid storage tank, the first liquid storage tank is used to collect the oil-water mixture flowing down from the self-suction range hood;

[0011] A first turbidity sensor, used for detecting the turbidity of the oil-water mixture in the first liquid storage tank;

[0012] A controller is electrically connected to the first turbidity sensor signal, and is used to obtain and record the turbidity information of the oil-water mixture in the first liquid storage tank and the cumulative operating time information of the range hood, and control the start of the cleaning program of the range hood when the cumulative operating time of the range hood reaches or exceeds a preset cumulative operating time threshold and when the turbidity of the oil-water mixture in the first liquid storage tank reaches a preset turbidity threshold.

[0013] In order to realize the recycling of the cleaning liquid of the range hood, the range hood also includes:

[0014] A filtering unit connected to the first liquid storage tank and configured to filter the oil-water mixture in the first liquid storage tank;

[0015] A first pump is provided between the first liquid storage tank and the filter unit, and is used to pump the oil-water mixture in the first liquid storage tank to the filter unit. The first pump is connected to the controller by electrical signals and is started or shut down by the controller.

[0016] A cleaning liquid storage unit, comprising a second liquid storage tank, the second liquid storage tank being connected to the filtering unit and being used to store the cleaning liquid obtained after filtering by the filtering unit;

[0017] a flushing unit, comprising an ejector, the ejector being connected to the second liquid storage tank and being used for spraying the cleaning liquid in the second liquid storage tank onto the parts to be cleaned in the range hood;

[0018] The second pump is arranged between the second liquid storage tank and the injector, and is used to pump the cleaning liquid in the second liquid storage tank to the injector. The controller is connected with the second pump by electrical signals, and is started or shut down by the controller.

[0019] Due to the different turbidities of the oil-water mixture, the hydraulic pressure required by the filter unit to achieve the best filtering effect is different. In order to achieve the best purification effect and effectively reduce the turbidity of the filtered cleaning liquid, thereby ensuring the cleaning effect of the corresponding components in the range hood, the controller controls the pumping pressure of the first pump through the output signal of the first turbidity sensor received.

[0020] Since the jet speed of the jet of the flushing unit is different, the impact force on the oil stains on the corresponding parts in the range hood is different, and the cleaning effect is different. In addition, since the turbidity value of the cleaning liquid is different, the dissolving ability of the oil stains is also different. Therefore, in order to better match the jet speed of the jet of the flushing unit with the turbidity value of the cleaning liquid, the range hood also includes:

[0021] The second turbidity sensor is used to detect the turbidity of the cleaning liquid in the second liquid storage tank and is electrically connected to the controller. The controller controls the pumping pressure of the second pump according to the output signal of the second turbidity sensor.

[0022] In order to make the turbidity value of the oil-water mixture in the first liquid storage tank obtained by the first turbidity sensor more accurately reflect the amount of oil stains on the components to be cleaned of the range hood, and thus accurately determine the timing of starting the cleaning program of the range hood, the range hood further includes:

[0023] The first liquid level sensor is used to detect the liquid level of the oil-water mixture in the first liquid storage tank, and the controller is connected to the first liquid level sensor by electrical signals.

[0024] Therefore, the controller can control the start of the cleaning program of the range hood when the cumulative operating time of the range hood reaches or exceeds the preset cumulative operating time threshold, and when the liquid level of the oil-water mixture in the first liquid storage tank reaches a predetermined liquid level range and the turbidity of the oil-water mixture in the first liquid storage tank reaches a preset turbidity threshold.

[0025] As an improvement, the range hood further includes a second liquid level sensor for detecting the liquid level of the oil-water mixture in the second liquid storage tank, and the controller is electrically connected to the second liquid level sensor to control the first pump to be turned off and the second pump to be turned on when the liquid level of the oil-water mixture in the second liquid storage tank reaches the third set liquid level, and to control the second pump to be turned off when the liquid level of the oil-water mixture in the second liquid storage tank is lower than the fourth set liquid level. The above structural design can achieve stable circulation of the cleaning liquid required in the cleaning process, and the amount of cleaning liquid sprayed in each cleaning operation in the above intermittent cycle cleaning process is basically fixed, so that the amount flowing into the first liquid storage tank after cleaning is also basically fixed and will not change significantly. Correspondingly, the turbidity detection value in the first liquid storage tank is also more accurate.

[0026] In order to further improve the dissolving ability of the cleaning liquid on oil stains, a heating system is also included between the second liquid storage tank and the second pump, and the heating system is used to heat the cleaning liquid in the second liquid storage tank.

[0027] As an improvement, the parts to be cleaned in the range hood include at least one of a volute and an impeller. During the operation of the range hood, most of the oil will be retained on the volute and the impeller, which will cause the impeller to lose its dynamic balance and the air duct to change due to the oil accumulation on the surface of the volute, thereby causing problems such as a reduction in the impeller speed of the range hood, resonance of the whole machine, and increased noise. Therefore, the volute, impeller and other parts of the range hood need to be cleaned in a timely manner.

[0028] The technical solution adopted by the present invention to solve the second technical problem is: a cleaning control method for a range hood, comprising the following steps:

[0029] S1, the range hood stops running;

[0030] S2. Obtain the cumulative running time t of the range hood, and determine whether the cumulative running time t of the range hood reaches or exceeds the preset cumulative running time threshold t m If yes, go to step S3, if no, repeat step S2;

[0031] S3, obtaining the turbidity value A0 of the current oil-water mixture in the first liquid storage tank, and determining whether the current turbidity value A0 of the oil-water mixture is greater than the set turbidity threshold value A m If yes, proceed to step S4, if no, repeat step S3;

[0032] S4, starting the cleaning program of the range hood, and the accumulated running time t of the range hood is reset to zero and the timing is restarted.

[0033] In order to make the turbidity detection of the oil-water mixture in the first liquid storage tank more accurate, the range hood further comprises:

[0034] A first liquid level sensor, used for detecting the liquid level of the oil-water mixture in the first liquid storage tank, the controller being electrically connected to the first liquid level sensor;

[0035] The range hood cleaning control method further includes the following steps after step S2 and before step S3:

[0036] S21, obtaining the liquid level information of the oil-water mixture in the first liquid storage tank, and determining whether the liquid level of the oil-water mixture in the first liquid storage tank is within a predetermined liquid level range, if yes, proceeding to step S3, if no, repeating step S21;

[0037] In order to start the cleaning program accurately and timely, and to ensure the stability of the supply of cleaning liquid during the cleaning process after the cleaning program is started, a cleaning control method for a range hood includes the following steps:

[0038] S1, the range hood stops running;

[0039] S2. Obtain the cumulative running time t of the range hood, and determine whether the cumulative running time t of the range hood reaches or exceeds the preset cumulative running time threshold t m If yes, go to step S3, if no, repeat step S2;

[0040] S3, obtaining the turbidity value A0 of the current oil-water mixture in the first liquid storage tank, and determining whether the current turbidity value A0 of the oil-water mixture is greater than the set turbidity threshold value A m If yes, proceed to step S4, if no, repeat step S3;

[0041] S4, starting the cleaning program of the range hood, and the accumulated running time t of the range hood is reset to zero and the timing is restarted;

[0042] S5, starting the first pump to pump the oil-water mixture in the first liquid storage tank to the filter unit, obtaining cleaning liquid after filtering by the filter unit, storing the cleaning liquid in the second liquid storage tank, and obtaining liquid level information of the cleaning liquid in the second liquid storage tank through the second liquid level sensor, and when the liquid level in the second liquid storage tank reaches a third set liquid level, closing the first pump so that a fixed amount of cleaning liquid is stored in the second liquid storage tank;

[0043] S6. Start the second pump to pump the cleaning liquid in the second liquid storage tank to the injector, and then spray it onto the parts to be cleaned in the range hood through the injector. The oil-water mixture after cleaning flows back to the first liquid storage tank. When the liquid level in the second liquid storage tank is lower than the fourth set liquid level, turn off the second pump to complete a cleaning process, and record the number of cleaning times in the cleaning program.

[0044] The above cleaning control method can realize intermittent spraying operation in the whole cleaning procedure. Each spraying process of the ejector can spray a fixed amount of cleaning liquid onto the parts to be cleaned in the range hood, thereby ensuring the stability of the cleaning liquid supply during the cleaning process.

[0045] The technical solution adopted by the present invention to solve the third technical problem is:

[0046] After step S6, the method further includes the following steps:

[0047] S7, using the first turbidity sensor to detect the turbidity of the oil-water mixture received in the first liquid storage tank after the nth cleaning process is completed, and obtain a turbidity value A n ;

[0048] S8, determine whether the cleaning process is the first cleaning, if yes, go to step S9, if no, go to step S10;

[0049] S9, compare the currently acquired turbidity value A1 with the initially acquired turbidity value A0 of the oil-water mixture in the first liquid storage tank, and obtain the turbidity change value △A1 of the oil-water mixture after the cleaning process, wherein △A1=A1-A0, and n is the number of cleaning times after the cleaning program is started, and then determine whether △A1 is less than or equal to the preset turbidity change threshold value A, if yes, proceed to step S11, if not, return to step S5 and continue with the next cleaning;

[0050] S10, the currently acquired turbidity value A n Obtain the turbidity value A after the last cleaning process is completed n-1 , and obtain the turbidity change value △A of the oil-water mixture after the cleaning process n , where △A n =A n -A n-1 , n is the number of cleaning times after the cleaning program is started, n = 2, 3..., then, determine △A n Is it less than or equal to the preset turbidity change threshold A? If yes, proceed to step S11 and continue with the next cleaning; if no, return to step S5 and continue with the next cleaning;

[0051] S11, the cleaning procedure ends.

[0052] In order to achieve the best purification effect of the filter unit and effectively reduce the turbidity of the filtered cleaning liquid, thereby ensuring the cleaning effect of the corresponding components in the range hood, the above step S5 also includes the following steps:

[0053] S51, the controller obtains an initial turbidity value A0 of the oil-water mixture in the first liquid storage tank obtained by the first turbidity sensor or a turbidity value A0 of the oil-water mixture received in the first liquid storage tank after the nth cleaning process is completed. n , control the first pump to be at the turbidity value A0 or turbidity value A n Matching pumping pressure.

[0054] In order to better match the injection speed of the injector of the flushing unit with the turbidity value of the cleaning liquid, thereby achieving a stable cleaning effect, a cleaning control method for a range hood includes the following steps:

[0055] S1, the range hood stops running;

[0056] S2. Obtain the cumulative running time t of the range hood, and determine whether the cumulative running time t of the range hood reaches or exceeds the preset cumulative running time threshold t m If yes, go to step S3, if no, repeat step S2;

[0057] S3, obtaining the turbidity value A0 of the current oil-water mixture in the first liquid storage tank, and determining whether the current turbidity value A0 of the oil-water mixture is greater than the set turbidity threshold value A m If yes, proceed to step S4, if no, repeat step S3;

[0058] S4, starting the cleaning program of the range hood, and the accumulated running time t of the range hood is reset to zero and the timing is restarted;

[0059] S5, starting the first pump to pump the oil-water mixture in the first liquid storage tank to the filter unit, obtaining cleaning liquid after filtering by the filter unit, storing the cleaning liquid in the second liquid storage tank, and obtaining liquid level information of the cleaning liquid in the second liquid storage tank through the second liquid level sensor, and when the liquid level in the second liquid storage tank reaches a third set liquid level, closing the first pump so that a fixed amount of cleaning liquid is stored in the second liquid storage tank;

[0060] S6, starting the second pump, pumping the cleaning liquid in the second liquid storage tank to the injector, and injecting the cleaning liquid onto the parts to be cleaned in the range hood through the injector, and the cleaned oil-water mixture flows back to the first liquid storage tank, and when the liquid level in the second liquid storage tank is lower than the fourth set liquid level, the second pump is turned off to complete a cleaning process, and the number of continuous cleaning times in the cleaning program is recorded;

[0061] The above step S6 also includes the following steps:

[0062] S61, using the second turbidity sensor to detect the turbidity of the cleaning liquid in the second liquid storage tank before the start of the current nth cleaning process, to obtain a turbidity value B n The controller controls the second pump to be at a position corresponding to the turbidity value B according to the output signal of the second turbidity sensor received. n Matching pumping pressure.

[0063] In order to effectively remove the oil stains on the impeller, a cleaning control method for a range hood includes the following steps:

[0064] S1, the range hood stops running;

[0065] S2. Obtain the cumulative running time t of the range hood, and determine whether the cumulative running time t of the range hood reaches or exceeds the preset cumulative running time threshold t m If yes, go to step S3, if no, repeat step S2;

[0066] S3, obtaining the turbidity value A0 of the current oil-water mixture in the first liquid storage tank, and determining whether the current turbidity value A0 of the oil-water mixture is greater than the set turbidity threshold value A m If yes, proceed to step S4, if no, repeat step S3;

[0067] S4, starting the cleaning program of the range hood, and the accumulated running time t of the range hood is reset to zero and the timing is restarted;

[0068] S5, starting the first pump to pump the oil-water mixture in the first liquid storage tank to the filter unit, obtaining cleaning liquid after filtering by the filter unit, storing the cleaning liquid in the second liquid storage tank, and obtaining liquid level information of the cleaning liquid in the second liquid storage tank through the second liquid level sensor, and when the liquid level in the second liquid storage tank reaches a third set liquid level, closing the first pump so that a fixed amount of cleaning liquid is stored in the second liquid storage tank;

[0069] S6, starting the second pump, pumping the cleaning liquid in the second liquid storage tank to the injector, and injecting the cleaning liquid onto the impeller in the range hood through the injector, and the cleaned oil-water mixture flows back to the first liquid storage tank, and when the liquid level in the second liquid storage tank is lower than the fourth set liquid level, the second pump is turned off, completing a cleaning process, and recording the number of cleaning times in the cleaning procedure;

[0070] The above step S6 also includes the following steps:

[0071] S61, using the second turbidity sensor to detect the turbidity of the cleaning liquid in the second liquid storage tank before the start of the current nth cleaning process, to obtain a turbidity value B n The controller controls the second pump to be at a position corresponding to the turbidity value B according to the output signal of the second turbidity sensor received. n Matching pumping pressure;

[0072] S62: The controller controls the impeller of the range hood to adjust the turbidity value B according to the output signal of the second turbidity sensor received. n Rotate forward and reverse at matching speeds.

[0073] In order to further improve the decontamination effect of the cleaning liquid, a cleaning control method for a range hood includes the following steps:

[0074] S1, the range hood stops running;

[0075] S2. Obtain the cumulative running time t of the range hood, and determine whether the cumulative running time t of the range hood reaches or exceeds the preset cumulative running time threshold t m If yes, go to step S3, if no, repeat step S2;

[0076] S3, obtaining the turbidity value A0 of the current oil-water mixture in the first liquid storage tank, and determining whether the current turbidity value A0 of the oil-water mixture is greater than the set turbidity threshold value A m If yes, proceed to step S4, if no, repeat step S3;

[0077] S4, starting the cleaning program of the range hood, and the accumulated running time t of the range hood is reset to zero and the timing is restarted;

[0078] S5, starting the first pump to pump the oil-water mixture in the first liquid storage tank to the filter unit, obtaining cleaning liquid after filtering by the filter unit, storing the cleaning liquid in the second liquid storage tank, and obtaining liquid level information of the cleaning liquid in the second liquid storage tank through the second liquid level sensor, and when the liquid level in the second liquid storage tank reaches a third set liquid level, closing the first pump so that a fixed amount of cleaning liquid is stored in the second liquid storage tank;

[0079] S6, the heating system is turned on to heat the cleaning liquid in the second liquid storage tank. After the cleaning liquid reaches the set temperature, the second pump is started, and the heated cleaning liquid is pumped to the ejector through the second pump, and is ejected onto the parts to be cleaned in the range hood through the ejector. The cleaned oil-water mixture flows back to the first liquid storage tank. When the liquid level in the second liquid storage tank is lower than the fourth set liquid level, the second pump is turned off to complete a cleaning process, and the number of continuous cleaning times in the cleaning program is recorded;

[0080] Compared with the prior art, the advantages of the present invention are as follows: on the basis that the cumulative operating time of the range hood reaches or exceeds the preset cumulative operating time threshold, the present invention obtains the turbidity information of the oil-water mixture in the first liquid storage tank through the first turbidity sensor, and when the turbidity of the oil-water mixture in the first liquid storage tank also reaches the preset turbidity threshold, the cleaning program of the range hood is finally controlled to start. Therefore, a turbidity information judgment condition of the oil-water mixture in the first liquid storage tank is added, which can correct the shortcomings of the prior art method of determining whether to start the cleaning program only by the cumulative operating time of the range hood. The present invention can more accurately reflect the oil pollution situation on the corresponding internal components of the range hood through the combination of the cumulative operating time of the range hood and the turbidity information, thereby accurately determining whether the range hood needs to be cleaned, avoiding the problem of missing the best cleaning opportunity and causing excessive accumulation of oil pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0081] Figure 1 This is a front view of a range hood according to an embodiment of the present invention (without the front side plate of the housing, the oil guide plate and other structures);

[0082] Figure 2 is a schematic diagram of a cleaning process of a range hood according to an embodiment of the present invention;

[0083] Figure 3 This is a control flow chart of the cleaning process of the range hood according to an embodiment of the present invention. DETAILED DESCRIPTION

[0084] The present invention is further described in detail below with reference to the accompanying drawings.

[0085] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Since the embodiments disclosed in the present invention can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0086] See also Figure 1-Figure 3 A range hood includes a housing 80, a fan system 81 disposed in the housing 80, and a cleaning circulation device. During long-term use, oil and dirt will accumulate inside the range hood and on its components (such as an impeller 83 and a volute 82 of the fan system 81). When a large amount of oil and dirt accumulates, the performance of oil fume extraction will be affected. Therefore, the cleaning circulation device is required to clean the oil and dirt inside the range hood and its components in a timely manner.

[0087] The above-mentioned cleaning circulation device is arranged inside the casing 80, and specifically includes an oil-water collection unit, a first liquid level sensor 12, a first turbidity sensor 11, a first pump 21, a filtering unit 30, a cleaning liquid storage unit, a second liquid level sensor 42, a second turbidity sensor 41, a heating system 51, a second pump 61, a flushing unit and a controller (not shown), wherein the first liquid level sensor 12, the first turbidity sensor 11, the first pump 21, the second liquid level sensor 42, the second turbidity sensor 41, the heating system 51 and the second pump 61 are all connected to the controller electrical signal.

[0088] See also Figure 1 The oil-water collection unit includes a first liquid storage tank 10, which is used to collect the oil-water mixture flowing down from the range hood. Specifically, the first liquid storage tank 10 of this embodiment is located at the bottom of the volute 82. During the operation of the range hood, the oil-water mixture accumulated on the volute 82 of the fan system 81 and the impeller 83 can flow into the first liquid storage tank 10. Similarly, after the cleaning program is started, the cleaning liquid sprayed by the shower unit of the cleaning circulation device to the fan system 81 will also be collected in the first liquid storage tank 10.

[0089] The first turbidity sensor 11 is provided on the first liquid storage tank 10, and is used to detect the turbidity of the oil-water mixture in the first liquid storage tank 10, so as to obtain the turbidity information of the oil-water mixture in the first liquid storage tank 10. The first liquid level sensor 12 is provided on the first liquid storage tank 10, and is used to detect the liquid level of the oil-water mixture in the first liquid storage tank 10, so as to obtain the liquid level information of the oil-water mixture in the first liquid storage tank 10. The first turbidity sensor 11 and the first liquid level sensor 12 can both adopt various turbidity sensor structures and liquid level sensor structures in the prior art.

[0090] Continue to see Figure 1 The filter unit 30 includes a pre-filter 31 and a filter body. The pre-filter 31 is connected to the first liquid storage tank 10 and is used to filter the oil-water mixture in the first liquid storage tank 10 to block large particles of impurities. The filter body is located downstream of the pre-filter 31. The filter body can adopt a multi-stage composite filter element. The multi-stage composite filter element combined with different pumping pressures can achieve a good purification effect.

[0091] The first pump 21 is disposed between the first liquid storage tank 10 and the pre-filter 31 of the filter unit 30, and is used to pump the oil-water mixture in the first liquid storage tank 10 to the filter unit 30. Due to the different turbidities of the oil-water mixture, the pumping pressure (working pressure) required by the filter unit 30 to achieve the best filtering effect is different. In order to achieve the best purification effect and effectively reduce the turbidity of the filtered cleaning liquid, thereby ensuring the cleaning effect of the corresponding components in the range hood, the controller of this embodiment can not only control the start and stop of the first pump 21, but also control the pumping pressure of the first pump 21 through the output signal of the first turbidity sensor 11 received. For example, when the first turbidity sensor 11 detects that the turbidity range of the oil-water mixture in the first liquid storage tank 10 is in the low range, the controller can control the first pump 21 to operate normally, so that the oil-water mixture in the first liquid storage tank 10 can pass through the pre-filter 31 and the composite filter element at a low flow rate (such as a flow rate of a). When the first turbidity sensor 11 detects that the turbidity range of the oil-water mixture in the first liquid storage tank 10 is in the medium range, the controller can control the first pump 21 to operate at high power, so that the oil-water mixture in the first liquid storage tank 10 can pass through the pre-filter 31 and the composite filter element at a medium flow rate (such as a flow rate of 2a). When the first turbidity sensor 11 detects that the turbidity range of the oil-water mixture in the first liquid storage tank 10 is in the high range, the controller can control the first pump 21 to operate at full power, so that the oil-water mixture in the first liquid storage tank 10 can pass through the pre-filter 31 and the composite filter element at a high flow rate (such as a flow rate of 4a).

[0092] The cleaning liquid storage unit includes a second liquid storage tank 40, which is connected to the filter unit 30 and is used to store the cleaning liquid obtained after filtering by the filter unit 30. The second turbidity sensor 41 is arranged on the second liquid storage tank 40, and is used to detect the turbidity of the oil-water mixture in the second liquid storage tank 40 to obtain the turbidity information of the oil-water mixture in the second liquid storage tank 40. The second liquid level sensor 42 is arranged on the second liquid storage tank 40, and is used to detect the liquid level of the oil-water mixture in the second liquid storage tank 40 to obtain the liquid level information of the oil-water mixture in the second liquid storage tank 40. Among them, the second turbidity sensor 41 and the second liquid level sensor 42 can adopt various turbidity sensor structures and liquid level sensor structures in the prior art.

[0093] The flushing unit includes an ejector 71, which is connected to the second liquid storage tank 40 and is used to spray the cleaning liquid in the second liquid storage tank 40 onto the parts to be cleaned in the range hood, wherein the ejection port of the ejector 71 can be directly opposite to the air intake port of the fan system. The second pump 61 is arranged between the second liquid storage tank 40 and the ejector 71, and is used to pump the cleaning liquid in the second liquid storage tank 40 to the ejector 71. In order to further improve the dissolving ability of the cleaning liquid on oil stains, a heating system 51 is arranged between the second liquid storage tank 40 and the second pump 61, and the heating system 51 is used to heat the cleaning liquid flowing out of the second liquid storage tank 40.

[0094] Since the injection speed of the injector 71 of the flushing unit is different, the impact force on the oil stains on the corresponding parts in the range hood is different, and the cleaning effect is different. In addition, since the turbidity values ​​of the cleaning liquid are different, the dissolving ability of the oil stains is also different. Therefore, in order to better match the injection speed of the injector 71 of the flushing unit with the turbidity value of the cleaning liquid, the controller of this embodiment can control the pumping pressure of the second pump 61 through the output signal of the received second turbidity sensor 41. For example, when the second turbidity sensor 41 detects that the turbidity range of the oil-water mixture in the second liquid storage tank 40 is in the low range, the controller can control the second pump 61 to operate normally, so that the oil-water mixture in the second liquid storage tank 40 can be pumped to the injector 71 at a low flow rate (such as a flow rate of b), that is, the injection speed of the injector 71 is relatively low. When the second turbidity sensor 41 detects that the turbidity range of the oil-water mixture in the second liquid storage tank 40 is in the high range, the controller can control the second pump 61 to operate at high power, so that the oil-water mixture in the second liquid storage tank 40 can be pumped to the ejector 71 at a high flow rate (such as a flow rate of 2b), that is, the ejection speed of the ejector 71 is relatively high. At the same time, the controller also controls the impeller 83 of the range hood to rotate forward and reverse at a speed matching the turbidity value Bn according to the output signal of the second turbidity sensor 41 received. For example, when the second turbidity sensor 41 detects that the turbidity range of the oil-water mixture in the second liquid storage tank 40 is in the low range, the controller controls the impeller 83 to rotate forward and reverse at a high speed. When the second turbidity sensor 41 detects that the turbidity range of the oil-water mixture in the second liquid storage tank 40 is in the high range, the controller controls the impeller 83 to rotate forward and reverse at a low speed, thereby preventing the cleaning liquid from being immediately thrown out after being sprayed onto the impeller 83 and other components, thereby increasing the contact time between the cleaning liquid and the oil stains on the impeller 83 and other components, allowing the cleaning liquid to fully contact and dissolve the oil stains on the impeller 83 and other components, thereby improving the cleaning effect.

[0095] Since the existing range hoods basically determine whether to start the cleaning program based on the effective operation time of the range hood, and it is unreasonable to determine whether to start the cleaning program of the range hood only based on whether the range hood has reached the effective operation time, it is difficult to avoid the problem of missing the best cleaning time of the range hood and causing excessive accumulation of oil stains. To this end, an important utility model point of the present invention is that the controller obtains and records the turbidity information of the oil-water mixture in the first liquid storage tank 10 and the cumulative operation time information of the range hood, and controls the cleaning program of the range hood to start when the cumulative operation time of the range hood reaches or exceeds the preset cumulative operation time threshold and when the turbidity of the oil-water mixture in the first liquid storage tank 10 reaches the preset turbidity threshold. In this embodiment, on the basis that the accumulated running time of the range hood reaches or exceeds the preset accumulated running time threshold, a turbidity information judgment condition of the oil-water mixture in the first liquid storage tank 10 is added, which can correct the deficiency of the prior art method of judging whether to start the cleaning program only by the accumulated running time of the range hood. Through the combination of the accumulated running time of the range hood and the turbidity information, the oil stain situation on the corresponding internal components of the range hood can be more accurately reflected, so as to accurately judge whether the range hood needs to be cleaned, avoiding the problem of missing the best cleaning opportunity and causing excessive oil stain accumulation.

[0096] See also Figure 2 and Figure 3 , a range hood cleaning control method, comprising the following steps:

[0097] S1. The range hood stops running.

[0098] S2. Obtain the cumulative running time t of the range hood, and determine whether the cumulative running time t of the range hood reaches or exceeds the preset cumulative running time threshold t m If yes, go to step S3, if no, repeat step S2.

[0099] The above step S2 also includes the following steps:

[0100] S21. Obtain the liquid level information of the oil-water mixture in the first liquid storage tank 10 through the first liquid level sensor 12, and determine whether the liquid level of the oil-water mixture in the first liquid storage tank 10 is within a predetermined liquid level range. If yes, proceed to step S3; if not, repeat step S21, thereby improving the accuracy of the turbidity detection of the oil-water mixture in the first liquid storage tank 10 by the first turbidity sensor 11 in the following step S3.

[0101] S3, obtaining the turbidity value A0 of the current oil-water mixture in the first liquid storage tank 10 through the first turbidity sensor 11, and determining whether the current turbidity value A0 of the oil-water mixture is greater than the set turbidity threshold value A mIf yes, go to step S4, if no, repeat step S3.

[0102] S4, starting the cleaning program of the range hood, and the accumulated running time t of the range hood is reset to zero and the timing is restarted.

[0103] S5. Start the first pump 21 to pump the oil-water mixture in the first liquid storage tank 10 to the filter unit 30. After filtering by the filter unit 30, the cleaning liquid is obtained, and the cleaning liquid is stored in the second liquid storage tank 40. The liquid level information of the cleaning liquid in the second liquid storage tank 40 is obtained through the second liquid level sensor 42. When the liquid level in the second liquid storage tank 40 reaches the third set liquid level, turn off the first pump 21, so that a certain amount of cleaning liquid is stored in the second liquid storage tank 40.

[0104] In the above step S5, in order to prevent the first liquid storage tank 10 from being full and overflowing when receiving the oil-water mixture, when the first liquid level sensor 12 detects that the oil-water mixture received in the first liquid storage tank 10 reaches the first set liquid level, a signal can be sent to the controller and a full liquid reminder can be issued. At this time, the first pump 21 can be driven automatically or manually by the user. Correspondingly, when the first liquid level sensor 12 detects that the oil-water mixture received in the first liquid storage tank 10 is lower than the second set liquid level, a signal can be sent to the controller to control the first pump 21 to be turned off to avoid the problem of emptying.

[0105] The above step S5 further includes the following steps:

[0106] S51, the controller obtains the initial turbidity value A0 of the oil-water mixture in the first liquid storage tank 10 obtained by the first turbidity sensor 11 or the turbidity value A0 of the oil-water mixture received in the first liquid storage tank 10 after the nth cleaning process is completed. n , control the first pump 21 to be at the turbidity value A0 or turbidity value A n Matching pumping pressure, where n is the number of cleaning times after the cleaning program is started, n=1, 2, 3...

[0107] S6. The heating system 51 is turned on to heat the cleaning liquid in the second liquid storage tank 40. After the cleaning liquid reaches the set temperature, the second pump 61 is started to pump the heated cleaning liquid to the injector 71, and the heated cleaning liquid is sprayed onto the parts to be cleaned in the range hood through the injector 71. The cleaned oil-water mixture flows back to the first liquid storage tank 10. When the liquid level in the second liquid storage tank 40 is lower than the fourth set liquid level, the second pump 61 is turned off to complete a cleaning process, and the number of cleaning times in the cleaning program is recorded.

[0108] The above step S6 also includes the following steps:

[0109] S61, using the second turbidity sensor 41 to detect the turbidity of the cleaning liquid in the second liquid storage tank 40 before the start of the current nth cleaning process, to obtain a turbidity value B n The controller controls the second pump 61 to be at a position corresponding to the turbidity value B according to the output signal of the second turbidity sensor 41 received. n Matching pumping pressure.

[0110] S62, the second turbidity sensor 41 detects the turbidity of the cleaning liquid in the second liquid storage tank 40 before the start of the current n-th cleaning process, and the controller controls the impeller 83 of the range hood to adjust the turbidity value B according to the output signal of the second turbidity sensor 41 received. n Rotate forward and reverse at matching speeds.

[0111] S7, using the first turbidity sensor 11 to detect the turbidity of the oil-water mixture received in the first liquid storage tank 10 after the nth cleaning process is completed, and obtain a turbidity value A n .

[0112] S8. Determine whether this cleaning process is the first cleaning. If yes, proceed to step S9; if no, proceed to step S10.

[0113] S9. Compare the currently acquired turbidity value A1 with the initially acquired turbidity value A0 of the oil-water mixture in the first liquid storage tank 10 to obtain a turbidity change value △A1 of the oil-water mixture after the cleaning process, wherein △A1=A1-A0, and n is the number of cleanings continued after the cleaning program is started. Then, determine whether △A1 is less than or equal to the preset turbidity change threshold A. If so, proceed to step S11. If not, return to step S5 and proceed to the next cleaning.

[0114] S10, the currently acquired turbidity value A n Obtain the turbidity value A after the last cleaning process is completed n-1 By comparison, the turbidity change value of the oil-water mixture after the cleaning process is obtained. n , where △A n =A n -A n-1 , n is the number of cleaning times after the cleaning program is started, n = 2, 3..., then, determine △A n Is it less than or equal to the preset turbidity change threshold A? If yes, go to step S11 and continue with the next cleaning; if not, return to step S5 and continue with the next cleaning.

[0115] S11, the cleaning procedure ends.

Claims

1. A range hood, comprising: The oil-water collection unit comprises a first liquid storage tank (10), wherein the first liquid storage tank (10) is used to collect the oil-water mixture flowing down from the range hood; The invention is characterized in that: A first turbidity sensor (11) is used to detect the turbidity of the oil-water mixture in the first liquid storage tank (10); a controller, connected to the first turbidity sensor (11) by electrical signals, for acquiring and recording turbidity information of the oil-water mixture in the first liquid storage tank (10) and information on the accumulated operation time of the range hood, and controlling the start of a cleaning program of the range hood when the accumulated operation time of the range hood reaches or exceeds a preset accumulated operation time threshold and when the turbidity of the oil-water mixture in the first liquid storage tank (10) reaches a preset turbidity threshold; A filtering unit (30) connected to the first liquid storage tank (10) and used for filtering the oil-water mixture in the first liquid storage tank (10); A first pump (21) is disposed between the first liquid storage tank (10) and the filter unit (30), and is used to pump the oil-water mixture in the first liquid storage tank (10) to the filter unit (30). The first pump (21) is connected to the controller by electrical signals and is started or shut down by the controller. A cleaning liquid storage unit, comprising a second liquid storage tank (40), the second liquid storage tank (40) being connected to the filtering unit (30) and being used for storing the cleaning liquid obtained after filtering by the filtering unit (30); a flushing unit, comprising an ejector (71), the ejector (71) being connected to the second liquid storage tank (40) and being used for spraying the cleaning liquid in the second liquid storage tank (40) onto the parts to be cleaned in the range hood; A second pump (61) is disposed between the second liquid storage tank (40) and the injector (71), and is used to pump the cleaning liquid in the second liquid storage tank (40) to the injector (71). The second pump (61) is electrically connected to the controller and is started or shut down by the controller. The filter unit (30) comprises a pre-filter (31) and a filter body, wherein the filter body is located downstream of the pre-filter (31).

2. The range hood according to claim 1, characterized in that: The controller controls the pumping pressure of the first pump (21) by receiving the output signal of the first turbidity sensor (11).

3. The range hood according to claim 1 or 2, characterized in that Also includes: The first liquid level sensor (12) is used to detect the liquid level of the oil-water mixture in the first liquid storage tank (10), and the controller is connected to the first liquid level sensor (12) via an electrical signal.

4. The range hood according to claim 1 or 2, characterized in that: The controller further comprises a second liquid level sensor (42) for detecting the liquid level of the oil-water mixture in the second liquid storage tank (40); the controller is electrically connected to the second liquid level sensor (42) so as to control the first pump (21) to be turned off and the second pump (61) to be started when the liquid level of the oil-water mixture in the second liquid storage tank (40) reaches a third set liquid level, and to control the second pump (61) to be turned off when the liquid level of the oil-water mixture in the second liquid storage tank (40) is lower than a fourth set liquid level.

5. The range hood according to claim 1, characterized in that Also includes: The second turbidity sensor (41) is used to detect the turbidity of the cleaning liquid in the second liquid storage tank (40) and is electrically connected to the controller. The controller controls the pumping pressure of the second pump (61) by receiving the output signal of the second turbidity sensor (41).

6. The range hood according to claim 4, characterized in that: The parts to be cleaned in the range hood include at least one of a volute (82) and an impeller (83).

7. The range hood according to claim 4, characterized in that: It also includes a heating system (51) disposed between the second liquid storage tank (40) and the second pump (61), wherein the heating system (51) is used to heat the cleaning liquid in the second liquid storage tank (40).

8. A cleaning control method for a range hood according to any one of claims 1 to 7, characterized in that The following steps are involved: S1, the range hood stops running; S2. Obtain the cumulative running time t of the range hood, and determine whether the cumulative running time t of the range hood reaches or exceeds the preset cumulative running time threshold t m If yes, go to step S3, if no, repeat step S2; S3, obtaining the turbidity value A0 of the current oil-water mixture in the first liquid storage tank (10), and determining whether the current turbidity value A0 of the oil-water mixture is greater than a set turbidity threshold value A m If yes, proceed to step S4, if no, repeat step S3; S4, starting the cleaning program of the range hood, and the accumulated running time t of the range hood is reset to zero and the timing is restarted.

9. A cleaning control method for a range hood according to claim 3, characterized in that The following steps are involved: S1, the range hood stops running; S2. Obtain the cumulative running time t of the range hood, and determine whether the cumulative running time t of the range hood reaches or exceeds the preset cumulative running time threshold t m If yes, go to step S21, if no, repeat step S2; S21, obtaining liquid level information of the oil-water mixture in the first liquid storage tank (10) through the first liquid level sensor (12), and determining whether the liquid level of the oil-water mixture in the first liquid storage tank (10) is within a predetermined liquid level range; if yes, proceeding to step S3; if no, repeating step S21; S3, obtaining the turbidity value A0 of the current oil-water mixture in the first liquid storage tank (10), and determining whether the current turbidity value A0 of the oil-water mixture is greater than a set turbidity threshold value A m If yes, proceed to step S4, if no, repeat step S3; S4, starting the cleaning program of the range hood, and the accumulated running time t of the range hood is reset to zero and the timing is restarted.

10. A cleaning control method for a range hood according to claim 4, characterized in that The following steps are involved: S1, the range hood stops running; S2. Obtain the cumulative running time t of the range hood, and determine whether the cumulative running time t of the range hood reaches or exceeds the preset cumulative running time threshold t m If yes, go to step S3, if no, repeat step S2; S3, obtaining the turbidity value A0 of the current oil-water mixture in the first liquid storage tank (10), and determining whether the current turbidity value A0 of the oil-water mixture is greater than a set turbidity threshold value A m If yes, proceed to step S4, if no, repeat step S3; S4, starting the cleaning program of the range hood, and the accumulated running time t of the range hood is reset to zero and the timing is restarted; S5, starting the first pump (21) to pump the oil-water mixture in the first liquid storage tank (10) to the filtering unit (30), obtaining cleaning liquid after filtering by the filtering unit (30), storing the cleaning liquid in the second liquid storage tank (40), and obtaining liquid level information of the cleaning liquid in the second liquid storage tank (40) through the second liquid level sensor (42); when the liquid level in the second liquid storage tank (40) reaches a third set liquid level, closing the first pump (21) so that a fixed amount of cleaning liquid is stored in the second liquid storage tank (40); S6, start the second pump (61), pump the cleaning liquid in the second liquid storage tank (40) to the injector (71), and inject the cleaning liquid onto the parts to be cleaned in the range hood through the injector (71). The oil-water mixture after cleaning flows back into the first liquid storage tank (10). When the liquid level in the second liquid storage tank (40) is lower than the fourth set liquid level, turn off the second pump (61), complete a cleaning process, and record the number of cleaning times.

11. The range hood cleaning control method according to claim 10, characterized in that: After step S6, the method further includes the following steps: S7, using the first turbidity sensor (11) to detect the turbidity of the oil-water mixture received in the first liquid storage tank (10) after the nth cleaning process is completed, and obtain a turbidity value A n ; S8, determine whether the cleaning process is the first cleaning, if yes, go to step S9, if no, go to step S10; S9, comparing the currently acquired turbidity value A1 with the initially acquired turbidity value A0 of the oil-water mixture in the first liquid storage tank (10), to obtain a turbidity change value △A1 of the oil-water mixture after the cleaning process, wherein △A1=A1-A0, and n is the number of cleaning times after the cleaning program is started, and then determining whether △A1 is less than or equal to a preset turbidity change threshold value A, if yes, proceeding to step S11, if not, returning to step S5 and continuing with the next cleaning; S10, the currently acquired turbidity value A n Obtain the turbidity value A after the last cleaning process is completed n-1 By comparison, the turbidity change value of the oil-water mixture after the cleaning process is obtained. n , where △A n =A n -A n-1 , n is the number of cleaning times after the cleaning program is started, n = 2, 3..., then, determine △A n Is it less than or equal to the preset turbidity change threshold A? If yes, proceed to step S11 and continue with the next cleaning; if no, return to step S5 and continue with the next cleaning; S11, the cleaning procedure ends.

12. The range hood cleaning control method according to claim 11, characterized in that: The above step S5 also includes the following steps: S51, the controller receives an initial turbidity value A0 of the oil-water mixture in the first liquid storage tank (10) obtained by the first turbidity sensor (11) or a turbidity value A0 of the oil-water mixture received in the first liquid storage tank (10) after the nth cleaning process is completed. n , control the first pump (21) to be at a turbidity value A0 or turbidity value A n Matching pumping pressure.

13. A cleaning control method for a range hood according to claim 5, characterized in that The following steps are involved: S1, the range hood stops running; S2. Obtain the cumulative running time t of the range hood, and determine whether the cumulative running time t of the range hood reaches or exceeds the preset cumulative running time threshold t m If yes, go to step S3, if no, repeat step S2; S3, obtaining the turbidity value A0 of the current oil-water mixture in the first liquid storage tank (10), and determining whether the current turbidity value A0 of the oil-water mixture is greater than a set turbidity threshold value A m If yes, proceed to step S4, if no, repeat step S3; S4, starting the cleaning program of the range hood, and the accumulated running time t of the range hood is reset to zero and the timing is restarted; S5, starting the first pump (21) to pump the oil-water mixture in the first liquid storage tank (10) to the filtering unit (30), obtaining cleaning liquid after filtering by the filtering unit (30), storing the cleaning liquid in the second liquid storage tank (40), and obtaining liquid level information of the cleaning liquid in the second liquid storage tank (40) through the second liquid level sensor (42); when the liquid level in the second liquid storage tank (40) reaches a third set liquid level, closing the first pump (21) so that a fixed amount of cleaning liquid is stored in the second liquid storage tank (40); S6, starting the second pump (61), pumping the cleaning liquid in the second liquid storage tank (40) to the injector (71), and injecting the cleaning liquid onto the parts to be cleaned in the range hood through the injector (71), and the oil-water mixture after cleaning flows back into the first liquid storage tank (10), and when the liquid level in the second liquid storage tank (40) is lower than the fourth set liquid level, the second pump (61) is turned off, completing a cleaning process, and recording the number of cleaning times; The above step S6 also includes the following steps: S61, using the second turbidity sensor (41) to detect the turbidity of the cleaning liquid in the second liquid storage tank (40) before the start of the current nth cleaning process, to obtain a turbidity value B n The controller controls the second pump (61) to be at a position corresponding to the turbidity value B according to the output signal of the second turbidity sensor (41) received. n Matching pumping pressure.

14. A cleaning control method for a range hood according to claim 6, characterized in that The following steps are involved: S1, the range hood stops running; S2. Obtain the cumulative running time t of the range hood, and determine whether the cumulative running time t of the range hood reaches or exceeds the preset cumulative running time threshold t m If yes, go to step S3, if no, repeat step S2; S3, obtaining the turbidity value A0 of the current oil-water mixture in the first liquid storage tank (10), and determining whether the current turbidity value A0 of the oil-water mixture is greater than a set turbidity threshold value A m If yes, proceed to step S4, if no, repeat step S3; S4, starting the cleaning program of the range hood, and the accumulated running time t of the range hood is reset to zero and the timing is restarted; S5, starting the first pump (21) to pump the oil-water mixture in the first liquid storage tank (10) to the filtering unit (30), obtaining cleaning liquid after filtering by the filtering unit (30), storing the cleaning liquid in the second liquid storage tank (40), and obtaining liquid level information of the cleaning liquid in the second liquid storage tank (40) through the second liquid level sensor (42); when the liquid level in the second liquid storage tank (40) reaches a third set liquid level, closing the first pump (21) so that a fixed amount of cleaning liquid is stored in the second liquid storage tank (40); S6, starting the second pump (61), pumping the cleaning liquid in the second liquid storage tank (40) to the injector (71), and injecting the cleaning liquid onto the impeller of the range hood through the injector (71), so that the oil-water mixture after cleaning flows back into the first liquid storage tank (10), and when the liquid level in the second liquid storage tank (40) is lower than the fourth set liquid level, shutting down the second pump (61), completing one cleaning process, and recording the number of cleaning times; The above step S6 also includes the following steps: S61, using the second turbidity sensor (41) to detect the turbidity of the cleaning liquid in the second liquid storage tank (40) before the start of the current nth cleaning process, to obtain a turbidity value B n The controller controls the second pump (61) to be at a position corresponding to the turbidity value B according to the output signal of the second turbidity sensor (41) received. n Matching pumping pressure; S62, using the second turbidity sensor (41) to detect the turbidity of the cleaning liquid in the second liquid storage tank (40) before the start of the current nth cleaning process, and obtain a turbidity value B n The controller controls the impeller of the range hood to move in accordance with the turbidity value B according to the output signal of the second turbidity sensor (41) received. n Rotate forward and reverse at matching speeds.

15. A cleaning control method for a range hood according to claim 7, characterized in that The following steps are involved: S1, the range hood stops running; S2. Obtain the cumulative running time t of the range hood, and determine whether the cumulative running time t of the range hood reaches or exceeds the preset cumulative running time threshold t m If yes, go to step S3, if no, repeat step S2; S3, obtaining the turbidity value A0 of the current oil-water mixture in the first liquid storage tank (10), and determining whether the current turbidity value A0 of the oil-water mixture is greater than a set turbidity threshold value A m If yes, proceed to step S4, if no, repeat step S3; S4, starting the cleaning program of the range hood, and the accumulated running time t of the range hood is reset to zero and the timing is restarted; S5, starting the first pump (21) to pump the oil-water mixture in the first liquid storage tank (10) to the filtering unit (30), obtaining cleaning liquid after filtering by the filtering unit (30), storing the cleaning liquid in the second liquid storage tank (40), and obtaining liquid level information of the cleaning liquid in the second liquid storage tank (40) through the second liquid level sensor (42); when the liquid level in the second liquid storage tank (40) reaches a third set liquid level, closing the first pump (21) so that a fixed amount of cleaning liquid is stored in the second liquid storage tank (40); S6. The heating system is turned on to heat the cleaning liquid in the second liquid storage tank (40). After the cleaning liquid reaches a set temperature, the second pump (61) is started. The heated cleaning liquid is pumped to the injector (71) by the second pump (61) and is injected onto the parts to be cleaned in the range hood by the injector (71). The oil-water mixture after cleaning flows back into the first liquid storage tank (10). When the liquid level in the second liquid storage tank (40) is lower than the fourth set liquid level, the second pump (61) is turned off to complete a cleaning process and the number of cleaning times is recorded.

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