CN107044663B

CN107044663B - Kitchen appliance, range hood thereof and automatic cleaning method of range hood

Info

Publication number: CN107044663B
Application number: CN201610080475.5A
Authority: CN
Inventors: 施罗特曼·彼得; 杨磊
Original assignee: Bo Xihua Electric Jiangsu Co Ltd; BSH Hausgeraete GmbH
Current assignee: Bo Xihua Electric Jiangsu Co Ltd; BSH Hausgeraete GmbH
Priority date: 2016-02-05
Filing date: 2016-02-05
Publication date: 2020-11-06
Anticipated expiration: 2036-02-05
Also published as: CN107044663A

Abstract

A kitchen appliance, a range hood thereof and an automatic cleaning method of the range hood are disclosed, wherein the cleaning method comprises the following steps: driving the impeller (3) to rotate reversely so as to throw at least part of grease on the impeller (3) onto the volute (1), wherein the direction of rotation of the impeller (3) when the impeller (3) rotates reversely is opposite to the direction of rotation of the impeller (3) of the range hood (V) in a smoke extraction mode; heating the volute (1) to melt the grease attached to the volute (1) and then flow into the oil collecting device (2). According to the invention, the impeller (3) and the volute (1) can be cleaned by driving the impeller (3) to rotate reversely and heating the volute (1), so that the internal cleaning effect of the range hood (V) is improved.

Description

Kitchen appliance, range hood thereof and automatic cleaning method of range hood

Technical Field

The invention relates to the technical field of kitchen appliances, in particular to a kitchen appliance, a range hood of the kitchen appliance and an automatic cleaning method of the range hood.

Background

The range hood is a kitchen appliance for purifying the kitchen environment, is arranged above a kitchen stove, and can quickly pump away waste burnt by the stove and oil smoke harmful to human bodies generated in the cooking process, discharge the waste and the oil smoke out of a room, reduce pollution and purify indoor air. In the use process of the range hood, grease is most easily attached to a volute and an impeller inside the range hood, and if the range hood is not effectively cleaned for a long time, the grease is accumulated more and more, and the grease is difficult to clean due to oxidation and air drying. In addition, the accumulation of excess grease on the impeller increases the weight of the impeller and thus the load on the motor that drives the impeller to rotate, thereby reducing the useful life of the motor. In addition, the inner wall of the volute can generate a rough wall surface due to the attachment of the grease, so that the smooth discharge of the oil smoke in the volute is influenced, and the noise is obviously increased.

For this reason, the prior art proposes a number of automatic cleaning methods of range hoods to clean the interior of the range hood. For example, chinese patent publication No. CN202303559U discloses an automatic cleaning method for a range hood, which heats a volute to melt grease on the volute and then flows into an oil collecting device of the range hood. However, the automatic cleaning method has the following disadvantages: on one hand, grease on the impeller cannot be cleaned, so that the internal cleaning effect of the range hood is poor; on the other hand, after being melted, the grease on the volute is easy to be retained on the volute and can not flow into the oil collecting device, so that the cleaning effect of the volute is poor.

Disclosure of Invention

It is an object of the present invention to provide an improved automatic cleaning method of a range hood to solve at least one of the above problems.

In order to achieve the aim, the invention provides an automatic cleaning method of a range hood, wherein the range hood comprises a volute, an oil collecting device and an impeller positioned in the volute; the automatic cleaning method comprises the following steps: driving the impeller to rotate reversely so as to throw at least part of grease on the impeller onto the volute, wherein the direction of rotation of the impeller when the impeller rotates reversely is opposite to the direction of rotation of the impeller of the range hood in a smoke extraction mode; heating the volute to melt the grease attached to the volute, so that the grease flows into the oil collecting device.

Optionally, driving the impeller in reverse comprises: and driving the impeller to rotate reversely N times, wherein N is greater than or equal to 1, and when N is greater than or equal to 2, the impeller rotates reversely for N times intermittently.

Optionally, driving the impeller to rotate in reverse a times before the heating, 1 ≦ a ≦ N; and/or the presence of a gas in the gas,

driving the impeller to rotate in reverse B times while heating, 1 ≦ B ≦ N; and/or the presence of a gas in the gas,

and after the volute is heated, driving the impeller to rotate reversely for C times, wherein C is less than or equal to 1 and is less than or equal to N.

Optionally, the rotation speed of the impeller during the reverse rotation is a set rotation speed, and the set rotation speed is greater than the rotation speed of the impeller of the range hood in the smoke exhaust mode.

Optionally, the automatic cleaning method further comprises: heating the impeller to melt the grease attached to the impeller.

Optionally, the automatic cleaning method further comprises: after the impeller is driven to rotate reversely, the impeller is driven to rotate forwardly, so that the air pressure in the volute is larger than the atmospheric pressure, the melted grease is discharged into the oil collecting device, and the rotation direction of the impeller in the forward rotation process is the same as the rotation direction of the impeller of the range hood in the smoke extraction mode.

Optionally, the heating is performed while, and/or after, completing the heating of the volute, driving the impeller forward.

Optionally, driving the impeller in reverse comprises: the impeller is driven to intermittently rotate reversely twice, and after the impeller is driven to rotate reversely for the second time, the impeller is driven to rotate forwardly;

heating the impeller after driving the impeller to rotate reversely for the first time and before rotating reversely for the second time; alternatively, the first and second electrodes may be,

heating the impeller while driving the impeller to rotate in reverse for a second time.

In addition, the invention also provides a range hood, which comprises a volute, an oil collecting device, an impeller positioned in the volute and a motor used for driving the impeller to rotate; the range hood further includes: a heating element for at least heating the volute; the controller is used for controlling the motor to rotate reversely according to the received automatic cleaning instruction so as to throw at least part of grease on the impeller onto the volute, and the direction of rotation of the motor during reverse rotation is opposite to the direction of rotation of the motor of the range hood in a smoke extraction mode; the controller is also used for controlling the heating element to generate heat according to the automatic cleaning instruction so as to heat the volute, so that the grease attached to the volute is melted and flows into the oil collecting device.

Optionally, the controller is configured to control the motor to rotate reversely N times according to the automatic cleaning instruction, where N is greater than or equal to 1, and when N is greater than or equal to 2, the controller is configured to control the motor to rotate reversely intermittently N times.

Optionally, the controller is further configured to:

controlling the motor to rotate reversely for A times before controlling the heating element to generate heat, wherein the number of times A is more than or equal to 1 and less than or equal to N; and/or the presence of a gas in the gas,

controlling the motor to rotate reversely for B times while controlling the heating element to generate heat, wherein B is more than or equal to 1 and less than or equal to N; and/or the presence of a gas in the gas,

and after the heating element is controlled to generate heat, the motor is controlled to rotate reversely for C times, wherein C is less than or equal to 1 and less than or equal to N.

Optionally, the controller is configured to control the motor to rotate reversely at a set rotation speed, where the set rotation speed is greater than a rotation speed of the motor of the range hood in the smoke exhaust mode.

Optionally, the heating element is further configured to heat the impeller to melt the grease attached to the impeller.

Alternatively, the motor is a brushless dc motor, and the controller is configured to control an energization timing of each phase stator winding of the motor to adjust a rotation direction of the motor.

Optionally, the controller is further configured to: after the motor is controlled to rotate reversely, the motor is controlled to rotate forwardly, so that the air pressure in the volute is larger than the atmospheric pressure, the melted grease is discharged into the oil collecting device, and the rotation direction of the motor in the forward rotation process is the same as the rotation direction of the motor of the range hood in the smoke extraction mode.

Optionally, the controller is further configured to control the motor to rotate forward while controlling the heating element to generate heat and/or after controlling the heating element to generate heat.

Optionally, the controller is to: controlling the motor to intermittently rotate reversely twice, and controlling the motor to rotate forwards after controlling the motor to rotate reversely for the second time;

the controller is further configured to: after the motor is controlled to rotate reversely for the first time and before the motor rotates reversely for the second time, the heating element is controlled to generate heat and heat the impeller, or the heating element is controlled to generate heat and heat the impeller while the motor is controlled to rotate reversely for the second time.

In addition, the invention also provides a kitchen appliance which comprises the range hood.

Optionally, the kitchen appliance is an integrated range.

Compared with the prior art, the technical scheme of the invention has the following advantages:

in the automatic cleaning method of the range hood, the impeller and the volute inside the range hood can be cleaned by driving the impeller to rotate reversely and heating the volute, so that the internal cleaning effect of the range hood is improved. Wherein:

when the impeller rotates reversely, at least part of grease on the impeller can be thrown onto the volute under the action of centrifugal force, so that the cleaning of the impeller is realized. In addition, the noise generated by the range hood when the impeller rotates reversely is smaller than the noise generated by the range hood when the impeller rotates forwardly, so that a user can obtain better use feeling when the range hood is automatically cleaned. And the energy consumption when the impeller rotates reversely is less than that when the impeller rotates forwardly, so that the cost consumed in the process of automatically cleaning the range hood is reduced. Moreover, the maximum rotating speed that can reach when the impeller reversal is greater than the maximum rotating speed that can reach when the impeller corotation, therefore the impeller can set up to great rotational speed in order to produce bigger centrifugal force when self-cleaning lampblack absorber, and then can get rid of more grease on the spiral case, has improved the clean effect of impeller.

After the volute is heated, grease accumulated in the volute and grease thrown to the volute from the impeller are melted and then flow into the oil collecting device, and therefore the volute is cleaned.

Further, in the automatic cleaning method of the range hood, the impeller is driven to rotate reversely for N times, wherein N is greater than or equal to 1. When N is more than or equal to 2, more grease on the impeller can be thrown onto the volute under the action of centrifugal force, so that the cleaning effect of the impeller is improved.

Further, in the automatic cleaning method of the range hood, the impeller is driven to rotate reversely for a plurality of times while the volute is heated and/or after the volute is heated, so that residual grease on the impeller is thrown onto the volute, and the cleaning effect of the impeller is improved.

Further, in the self-cleaning method of lampblack absorber, the rotational speed when the impeller reverses is the set rotational speed, the set rotational speed is greater than the rotational speed of lampblack absorber impeller under the mode of smoking, so, the impeller can rotate at a high speed to produce great centrifugal force, and then can get rid of more grease on the spiral case, improved the clean effect of impeller.

Further, in the automatic cleaning method of the range hood, the impeller is heated, so that the grease attached to the impeller is melted, the adhesive force of the grease on the impeller is reduced, the possibility that the grease is thrown to the volute from the impeller is increased, and the cleaning effect of the impeller is improved.

Further, in the automatic cleaning method of the range hood, after the impeller is driven to rotate reversely, the impeller is driven to rotate forwardly, so that the volute generates high pressure which is larger than the atmospheric pressure, the high pressure can provide a pushing effect for the melted grease in the volute, the grease in the volute can reach the oil collecting device more unhindered and smoothly, and the cleaning effect of the volute is improved.

Further, in the automatic cleaning method of the range hood, the impeller is driven to rotate forwards while the volute is heated, so that the grease on the volute is melted, the melted grease which is still remained on the volute is extruded out of the volute and flows into the oil collecting device, the possibility that the melted grease is remained on the volute is reduced, and the cleaning effect of the volute is improved.

Furthermore, in the automatic cleaning method of the range hood, the impeller is driven to rotate forwardly after the volute is heated, so that after the volute is heated, all the grease which is melted and still remains on the volute is extruded out of the volute at one time and then flows into the oil collecting device, energy waste caused by premature driving of the impeller to rotate forwardly is avoided, the phenomenon that the grease which is melted on the volute is still retained on the volute and cannot flow into the oil collecting device is also avoided, and balance between energy consumption for driving the impeller to rotate forwardly and the cleaning effect of the volute is achieved.

Further, in the automatic cleaning method of the range hood, the driving impeller intermittently rotates reversely twice, and after the driving impeller rotates reversely for the second time, the driving impeller rotates forwards. The impeller is heated after the first counter-rotation of the drive impeller, before the second counter-rotation, or the impeller is heated while the drive impeller is counter-rotating for the second time. The impeller can be thrown the less grease of adhesive force to the spiral case on can tentatively when the reversal for the first time, has realized the first cleanness of impeller. The impeller is heated before the impeller rotates for the second time or when the impeller rotates for the second time, the adhesive force of the residual grease on the impeller can be reduced, so that the residual grease on the impeller can be thrown onto the volute through the second rotation of the impeller, the secondary cleaning of the impeller is realized, and the cleaning effect of the impeller is further improved.

Drawings

FIG. 1 is a plan view of a range hood in an embodiment of the present invention as viewed from the front;

FIG. 2 is a cross-sectional view of the range hood of FIG. 1 taken along the direction D-D;

fig. 3 is a flowchart of an automatic cleaning method of a range hood in a first embodiment of the present invention.

The reference numerals are explained below:

1-a volute; 2-an oil collecting device; 3-an impeller; 4-a motor; 5-a heating element; 6-a controller; 7-outer shell.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

First embodiment

The embodiment provides an automatic cleaning method for a range hood, and as shown in fig. 1 to 2, a range hood V of the embodiment includes a volute 1, an oil collecting device 2 for collecting grease, an impeller 3 located in the volute 1, and a motor 4 for driving the impeller 3 to rotate. When the range hood V operates in a smoke exhaust mode to exhaust and discharge smoke generated during cooking outdoors, the motor 4 drives the impeller 3 to rotate.

The automatic cleaning method of the range hood of the embodiment is described below with reference to fig. 3. As shown in fig. 1 to 3, the automatic cleaning method of the present embodiment includes:

step S1: the impeller 3 is driven to rotate reversely so as to throw at least part of grease on the impeller 3 onto the volute 1, and the rotation direction of the impeller 3 when the impeller 3 rotates reversely is opposite to the rotation direction of the impeller 3 of the range hood V in the smoke extraction mode.

Step S2: the volute 1 is heated to melt the grease attached to the volute 1 and then flow into the oil collecting device 2.

Step S3: the impeller 3 is driven to rotate positively, so that the air pressure in the volute 1 is greater than the atmospheric pressure, the melted grease is discharged into the oil collecting device 2, and the rotation direction of the impeller 3 in the positive rotation process is the same as the rotation direction of the impeller 3 of the range hood V in the smoke extraction mode.

In the automatic cleaning method of the range hood of the embodiment, the motor 4 is used for driving the impeller 3 to rotate forwards and backwards. However, in the present invention, the embodiment of driving the impeller 3 to rotate forward and backward is not limited to the present embodiment.

In the automatic cleaning method of the range hood of the present embodiment, the spiral case 1 is heated by the heating element 5. However, in the technical solution of the present invention, the implementation manner of heating the scroll casing 1 is not limited to the embodiment, and for example, the scroll casing 1 may be heated by conducting heat generated by other high-temperature components to the scroll casing 1. In one embodiment, the high temperature component is a high temperature gas introduced into the volute 1.

Further, in the present embodiment, the heating element 5 includes a first heating unit, which is a heating wire disposed on the outer wall of the scroll casing 1, the heating wire being invisible in fig. 2 and represented by a dotted line. The reason for arranging the heating wire on the outer wall of the volute 1 is as follows: on the one hand, the heating element 5 can be prevented from being polluted by oil smoke, and on the other hand, the circulation of air flow can be prevented from being influenced by the arrangement of the heating element 5 on the inner wall of the volute 1. Note that the type of the heating element 5 is not limited to the present embodiment, and for example, the heating element 5 may be a heating sheet, a heating film, or the like which can be heated. In addition, the position of the heating element 5 should not be limited to the present embodiment as long as it can achieve heating of the scroll casing 1.

When the impeller 3 rotates reversely, at least part of grease on the impeller 3 can be thrown onto the volute 1 under the action of centrifugal force, so that the impeller 3 is cleaned. In addition, the noise (specifically, the sound of the air flow in the volute 1) generated by the range hood V when the impeller 3 rotates reversely is smaller than the noise generated by the range hood V when the impeller 3 rotates forwardly, so that a user can obtain better use feeling when the range hood is automatically cleaned. Moreover, the energy consumption for the reverse rotation of the impeller 3 is less than that for the forward rotation of the impeller 3, so the cost consumed in the process of automatically cleaning the range hood V is reduced. Moreover, the maximum rotational speed that can reach when impeller 3 reverses is greater than the maximum rotational speed that can reach when impeller 3 corotation, therefore impeller 3 can set up to great rotational speed in order to produce bigger centrifugal force when self-cleaning lampblack absorber V, and then can get rid of spiral case 1 with more grease on, improved impeller 3's clean effect.

After the volute 1 is heated, grease accumulated in the volute 1 and grease thrown onto the volute 1 from the impeller 3 are melted and then flow into the oil collecting device 2, so that the volute 1 is cleaned. Therefore, in the technical scheme of the invention, the impeller 3 and the volute 1 can be cleaned by driving the impeller 3 to rotate reversely and heating the volute 1, so that the internal cleaning effect of the range hood V is improved.

The grease melted in the scroll casing 1 may not smoothly reach the oil collecting device 2 due to various factors in the process of flowing to the oil collecting device 2. For example, when grease particles or grease lumps remain unmelted at a local position (a local position through which grease on the scroll casing 1 flows when flowing into the oil collecting device 2) on the inner wall of the scroll casing 1, or when the melted grease solidifies while flowing to the oil collecting device 2, the melted grease on the scroll casing 1 cannot smoothly reach the oil collecting device 2. Because the impeller 3 can generate high pressure greater than atmospheric pressure in the volute 1 when rotating positively, the high pressure can push the melted grease in the volute 1, so that the grease in the volute 1 can reach the oil collecting device 2 more smoothly without being blocked, and the cleaning effect of the volute 1 is further improved.

In the technical scheme of the invention, when the range hood V is automatically cleaned, the impeller 3 rotates reversely for N times, wherein N is more than or equal to 1. In the present invention, the time taken for the impeller 3 to rotate once in reverse is defined as T, and once in reverse rotation of the impeller 3 means that the impeller 3 rotates continuously and uninterruptedly during the time T.

When N is more than or equal to 2, more grease on the impeller 3 can be thrown onto the volute 1 under the action of centrifugal force, so that the cleaning effect of the impeller 3 is improved. When N is greater than or equal to 2, the impeller 3 is intermittently rotated in reverse N times. The time interval between two adjacent inversions can be arbitrarily set.

In the technical scheme of the invention, when the range hood V is automatically cleaned, the step of heating the volute 1 can be continuously carried out or intermittently carried out. If the intermittent operation is performed intermittently, the intermittent time can be arbitrarily set.

In the present embodiment, the impeller 3 is driven to rotate reversely a times, a being equal to N, before the volute 1 is heated, that is, the starting time of the volute 1 being heated is not earlier than the stopping time of the impeller 3 rotating reversely last time, and the time interval between the starting time of the volute 1 being heated and the stopping time of the impeller 3 rotating reversely last time may be zero or not. It should be noted that, in the present invention, when the step of heating the scroll casing 1 is performed intermittently, the starting time of heating the scroll casing 1 is the starting time of the first heating of the scroll casing 1. In this way, when the grease on the impeller 3 stops being thrown onto the volute 1, the volute 1 is heated again, so that all the grease thrown from the impeller 3 onto the volute 1 is melted, and the melted grease flows into the oil collecting device 2.

In the present embodiment, after the heating of the scroll casing 1 is completed, the impeller 3 is driven to rotate forward, that is, the starting time of the forward rotation of the impeller 3 is not earlier than the time when the scroll casing 1 stops being heated, and the time interval between the starting time of the forward rotation of the impeller 3 and the time when the scroll casing 1 stops being heated may be zero or may not be zero. It should be noted that, in the present invention, when the step of heating the scroll casing 1 is performed intermittently, the completion of heating the scroll casing 1 (also referred to as the stop of heating the scroll casing 1) refers to the stop time of the last heating of the scroll casing 1. Therefore, after the volute 1 is heated, all the grease which is melted and still remains on the volute 1 can be extruded out of the volute 1 at one time and then flows into the oil collecting device 2, so that energy waste caused by early driving of the impeller 3 to rotate forwards is avoided, the phenomenon that the grease melted on the volute 1 remains on the volute 1 and cannot flow into the oil collecting device 2 is also avoided, and balance between energy consumption for driving of the impeller 3 to rotate forwards and cleaning effect of the volute 1 is achieved.

In the first modification of the present embodiment, the scroll casing 1 is heated and the impeller 3 is driven to rotate forward, that is, the starting time of heating the scroll casing 1 is not later than the starting time of rotating the impeller 3 forward, and the time of stopping heating the scroll casing 1 is not earlier than the stopping time of rotating the impeller 3 forward. Therefore, the grease on the volute 1 can be melted, and the grease which is melted and still remained on the volute 1 can be extruded out of the volute 1 and then flows into the oil collecting device 2, so that the possibility that the melted grease is remained on the volute 1 is reduced, and the cleaning effect of the volute 1 is improved.

In a modification of the first modification, the stop timing of the normal rotation of the impeller 3 is later than the stop timing of the heating of the scroll casing 1.

In the second modification of the present embodiment, after the impeller 3 is driven to rotate in the reverse direction and before the scroll casing 1 is heated, the impeller 3 is driven to rotate in the normal direction, that is, the start time of the forward rotation of the impeller 3 is not earlier than the stop time of the last reverse rotation of the impeller 3 but earlier than the start time of the heating of the scroll casing 1, and the stop time of the forward rotation of the impeller 3 is later than the start time of the heating of the scroll casing 1. This embodiment has the following advantages over the second modification: energy waste caused by premature driving of the impeller 3 in the forward direction is avoided.

In this embodiment, the rotational speed when impeller 3 reverses is the rotational speed of setting for (being the fixed value), set for the rotational speed and be greater than lampblack absorber V impeller 3's under the mode of smoking rotational speed, so, when self-cleaning lampblack absorber V, impeller 3 can rotate under high speed to produce great centrifugal force, and then can get rid of more grease on spiral case 1, improved impeller 3's clean effect. Of course, in the modification of the present embodiment, the rotation speed of the impeller 3 in the reverse rotation may not be fixed, and when the amount of grease on the impeller 3 is large, the rotation speed of the impeller 3 in the reverse rotation may be set to be large, and when the amount of grease on the impeller 3 is small, the rotation speed of the impeller 3 in the reverse rotation may be set to be small.

In this embodiment, the time for each inversion of the impeller 3 is constant, so that the automatic cleaning method of the range hood V is simpler and has stronger operability. The time of each reversal of the impeller 3 can be set according to the accumulated working time value of the range hood V in the smoke extraction mode, and the accumulated working time value is the automatic cleaning period of the range hood V. When the accumulated value of the operating time is short, the time for each inversion of the impeller 3 may be set to be smaller, so as to avoid unnecessary energy waste. When the accumulated working time is longer, the time for each reversal of the impeller 3 may be set to be larger, so as to avoid poor cleaning effect of the impeller 3. In a specific embodiment, the cumulative operating time is 20 minutes to 35 minutes, and the time for each inversion of the impeller 3 is 20 seconds to 5 minutes. Note that the time for two adjacent rotations of the impeller 3 may be the same or different.

In a modification of the present embodiment, the time for the impeller 3 to rotate reversely may not be fixed, and may be adjusted in real time according to the grease on the impeller 3. For example, when grease is accumulated on the impeller 3 to a certain extent, which may cause vibration when the impeller 3 rotates, a sensor may be provided for detecting the vibration of the impeller 3, and when the degree of vibration of the impeller 3 is different according to the sensor, the time when the impeller 3 is reversed may be adjusted accordingly. For another example, another sensor may be provided which detects a change in the mass of the impeller 3, and when the change in the mass of the impeller 3 is different, indicating a different level of grease on the impeller 3, the time at which the impeller 3 is reversed may be adjusted accordingly.

In the embodiment, the rotating speed and the time of the forward rotation of the impeller 3 are constant, so that the automatic cleaning method of the range hood V is simpler and has stronger operability. The rotating speed and the time can be set according to a working time accumulated value of the range hood V in the smoke extraction mode, and the working time accumulated value is an automatic cleaning period of the range hood V. When the accumulated working time value is short, the rotating speed and the time can be set to be smaller, so that unnecessary energy waste is avoided. When the accumulated working time is longer, the rotation speed and the time can be set to be larger, so as to avoid poor cleaning effect of the volute 1. In a specific embodiment, the accumulated value of the working time is 20 minutes to 35 minutes, and the time for the forward rotation of the impeller 3 is 20 seconds to 5 minutes.

Of course, in the modification of the present embodiment, the rotation speed and time of the impeller 3 in the forward rotation may not be fixed, and when the amount of the melting grease remaining on the scroll casing 1 is large, the rotation speed and time of the impeller 3 in the forward rotation may be set to be large, and when the amount of the melting grease remaining on the scroll casing 1 is small, the rotation speed and time of the impeller 3 in the forward rotation may be set to be small.

In this embodiment, the automatic cleaning method further includes: the impeller 3 is heated so that the grease attached to the impeller 3 is melted, the adhesive force of the grease on the impeller 3 is reduced, the possibility that the grease is thrown from the impeller 3 to the volute 1 is increased, and the cleaning effect of the impeller 3 is improved. The starting time and the stopping time for heating the impeller 3 can be set arbitrarily, and in the present embodiment, the starting time for heating the impeller 3 is the same as the starting time for heating the scroll casing 1, and the stopping time for heating the impeller 3 is the same as the stopping time for heating the scroll casing 1.

In the present embodiment, the impeller 3 is heated by the heating element 5. However, in the technical solution of the present invention, the implementation manner of heating the impeller 3 is not limited to the present embodiment, and for example, the impeller 3 may be heated by transferring heat generated by other high-temperature components to the impeller 3. In one embodiment, the high temperature component is a high temperature gas introduced into the volute 1.

Further, in the present embodiment, the heating element 5 also comprises a second heating unit, which is responsible for heating the impeller 3. The second heating unit may be a heating wire, a heating sheet, a heating film, or the like, which can be heated, as the first heating unit of the heating element 5. In the present invention, the same component or two separate components may be used for heating the scroll casing 1 and the impeller 3.

In this embodiment, N is equal to 2, the precursor impeller 3 rotates in reverse for the first time, then the impeller 3 is driven to rotate in reverse for the second time, and then the impeller 3 is driven to rotate in forward. After the first reverse rotation of the drive impeller 3 and before the second reverse rotation, the impeller 3 is heated. Alternatively, the impeller 3 may be heated while the impeller 3 is driven to rotate in the second reverse rotation, that is, the impeller 3 may be heated during the second reverse rotation of the impeller 3, the impeller 3 may be heated immediately after the impeller 3 starts the second reverse rotation, or the impeller 3 may be heated again after a time interval after the impeller 3 starts the second reverse rotation and before the impeller 3 stops the second reverse rotation.

When the impeller 3 rotates reversely for the first time, grease with small adhesive force can be thrown to the volute 1 preliminarily, and the initial cleaning of the impeller 3 is realized. Before impeller 3 reversal for the second time or impeller 3 reversal for the second time while heating impeller 3, can reduce the adhesive force of remaining grease on impeller 3, so, through impeller 3 reversal for the second time, can get rid of on volute 1 with remaining grease on impeller 3, realized that impeller 3's secondary is clean, and then improved impeller 3's clean effect.

With continued reference to fig. 1-2, in this embodiment, the range hood V further includes a controller 6. The controller 6 is used for: and controlling the motor 4 to rotate reversely according to the received automatic cleaning instruction so as to throw at least part of grease on the impeller 3 onto the volute 1, wherein the rotation direction of the motor 4 when the motor 4 rotates reversely is opposite to the rotation direction of the motor 4 of the range hood V in the smoke extraction mode. The controller 6 is also configured to: and controlling the heating element 5 to generate heat according to the automatic cleaning instruction so as to heat the volute 1, so that the grease attached to the volute 1 is melted and flows into the oil collecting device 2.

In this embodiment, the controller 6 is further configured to: after the motor 4 is controlled to rotate reversely, the motor 4 is controlled to rotate forwardly, so that the air pressure in the volute 1 is larger than the atmospheric pressure, the melted grease is discharged into the oil collecting device 2, and the rotation direction of the motor 4 in the forward rotation process is the same as the rotation direction of the motor 4 of the range hood V in the smoke extraction mode.

In the technical scheme of the invention, the controller 6 is used for controlling the motor 4 to reversely rotate for N times according to the automatic cleaning instruction, wherein N is greater than or equal to 1. In the present invention, the meaning of the motor 4 rotating once refers to the meaning of the impeller 3 rotating once described above, and is not described herein again.

In the present invention, when the controller 6 controls the heating element 5 to generate heat according to the automatic cleaning command, the controller 6 may control the heating element 5 to generate heat continuously or intermittently. If the intermittent operation is performed intermittently, the intermittent time can be arbitrarily set.

In the present embodiment, the controller 6 drives the motor 4 to rotate reversely a times, a being equal to N, before controlling the heating element 5 to generate heat, that is, the starting time of heating the heating element 5 is not earlier than the stopping time of the last reverse rotation of the motor 4, and the time interval between the starting time of heating the heating element 5 and the stopping time of the last reverse rotation of the motor 4 may be zero or not. In the present invention, when the heating element 5 intermittently generates heat, the start time of the heating element 5 generating heat is the start time of the heating element 5 generating heat for the first time. In this way, when the grease on the impeller 3 stops being thrown onto the volute 1, the volute 1 is heated again, so that all the grease thrown from the impeller 3 onto the volute 1 is melted, and the melted grease flows into the oil collecting device 2.

In the present embodiment, the controller 6 controls the motor 4 to rotate forward after controlling the heating element 5 to generate heat, that is, the starting time of the motor 4 rotating forward is not earlier than the time when the heating element 5 stops generating heat, and the time interval between the starting time of the motor 4 rotating forward and the time when the heating element 5 stops generating heat may be zero or may not be zero. In the present invention, when the heating element 5 intermittently generates heat, the completion of the heat generation of the heating element 5 means the time when the heating element 5 stops generating heat last time. Therefore, after the volute 1 is heated, all the grease which is melted and still remains on the volute 1 can be extruded out of the volute 1 at one time and then flows into the oil collecting device 2, so that energy waste caused by early driving of the impeller 3 to rotate forwards is avoided, the phenomenon that the grease melted on the volute 1 remains on the volute 1 and cannot flow into the oil collecting device 2 is also avoided, and balance between energy consumption for driving of the impeller 3 to rotate forwards and cleaning effect of the volute 1 is achieved.

In the first modified example of the present embodiment, the controller 6 controls the motor 4 to rotate forward while controlling the heating element 5 to generate heat, that is, the start timing of the heating element 5 to generate heat is not later than the start timing of the motor 4 to rotate forward, and the stop timing of the heating element 5 to generate heat is not earlier than the stop timing of the motor 4 to rotate forward. Therefore, the grease on the volute 1 can be melted, and the grease which is melted and still remained on the volute 1 can be extruded out of the volute 1 and then flows into the oil collecting device 2, so that the possibility that the melted grease is remained on the volute 1 is reduced, and the cleaning effect of the volute 1 is improved.

In a modification of the first modification, the controller 6 controls the motor 4 to stop the normal rotation at a timing later than the timing at which the heating element 5 stops generating heat.

In the second modified example of the present embodiment, the controller 6 controls the motor 4 to rotate forward after controlling the motor 4 to rotate backward and before controlling the heating element 5 to generate heat, that is, the start time of the motor 4 to rotate forward is not earlier than the stop time of the last rotation of the motor 4 but earlier than the start time of the heating element 5 to generate heat, and the stop time of the motor 4 to rotate forward is later than the start time of the heating element 5 to generate heat.

In this embodiment, the rotational speed when motor 4 reverses is for setting for the rotational speed (being the fixed value), set for the rotational speed and be greater than lampblack absorber V motor 4's under the mode of smoking rotational speed, so, when self-cleaning lampblack absorber V, motor 4 can rotate under high speed to let impeller 3 produce great centrifugal force, and then can get rid of more grease on spiral case 1, improved impeller 3's clean effect. Of course, in the modification of the present embodiment, the rotation speed of the motor 4 in the reverse rotation may not be fixed, and when the amount of grease on the impeller 3 is large, the rotation speed of the motor 4 in the reverse rotation may be set to be larger, and when the amount of grease on the impeller 3 is small, the rotation speed of the motor 4 in the reverse rotation may be set to be smaller.

In this embodiment, the time for each reverse rotation of the motor 4 is constant, so that the automatic cleaning method of the range hood V is simpler and has stronger operability. The time of each reverse rotation of the motor 4 can be set according to the accumulated working time value of the range hood V in the smoke extraction mode, and the accumulated working time value is the automatic cleaning period of the range hood V. When the accumulated value of the operating time is short, the time for each reverse rotation of the motor 4 can be set to be smaller, so as to avoid unnecessary energy waste. When the accumulated working time is longer, the time for each reverse rotation of the motor 4 can be set to be larger, so as to avoid poor cleaning effect of the impeller 3. In a specific embodiment, the accumulated operating time is 20 to 35 minutes, and the time for each reverse rotation of the motor 4 is 20 seconds to 5 minutes. Note that, the time for two adjacent motor 4 reversals may be the same or different.

In a modification of the present embodiment, the time for the motor 4 to rotate in reverse may not be fixed, and may be adjusted in real time according to the grease on the impeller 3. For example, when grease is accumulated on the impeller 3 to a certain extent, which may cause vibration when the impeller 3 rotates, a sensor may be provided for detecting the vibration of the impeller 3, and when the degree of vibration of the impeller 3 is different according to the sensor, the time for the motor 4 to rotate reversely may be adjusted accordingly. For another example, another sensor may be provided, which detects a change in the mass of the impeller 3, and when the change in the mass of the impeller 3 is different, indicating a different content of grease on the impeller 3, the time for the motor 4 to reverse may be adjusted accordingly.

In this embodiment, the rotating speed and the time of the motor 4 in the forward rotation are constant, so that the automatic cleaning method of the range hood V is simpler and has stronger operability. The rotating speed and the time can be set according to a working time accumulated value of the range hood V in the smoke extraction mode, and the working time accumulated value is an automatic cleaning period of the range hood V. When the accumulated working time value is short, the rotating speed and the time can be set to be smaller, so that unnecessary energy waste is avoided. When the accumulated working time is longer, the rotation speed and the time can be set to be larger, so as to avoid poor cleaning effect of the volute 1. In a specific embodiment, the accumulated value of the working time is 20 minutes to 35 minutes, and the time for the motor 4 to rotate forward is 20 seconds to 5 minutes.

Of course, in the modified example of the present embodiment, the rotation speed and time of the motor 4 in the forward rotation may not be fixed, and when the amount of the melting grease remaining on the scroll casing 1 is large, the rotation speed and time of the motor 4 in the forward rotation may be set to be large, and when the amount of the melting grease remaining on the scroll casing 1 is small, the rotation speed and time of the motor 4 in the forward rotation may be set to be small.

In the present embodiment, N is equal to 2, and the controller 6 controls the motor 4 to rotate reversely for the first time, then controls the motor 4 to rotate reversely for the second time, and then controls the motor 4 to rotate normally. After the motor 4 is controlled to rotate reversely for the first time and before the motor rotates reversely for the second time, the heating element 5 is controlled to generate heat, and the impeller 3 is heated by the heating element 5 which generates heat. Alternatively, the controller 6 controls the heating element 5 to generate heat while controlling the motor 4 to rotate reversely for the second time, and the heating element 5 generating heat heats the impeller 3, that is, the impeller 3 is heated during the second reverse rotation of the motor 4, the impeller 3 may be heated immediately after the motor 4 starts the second reverse rotation, or the impeller 3 may be heated after a time interval after the motor 4 starts the second reverse rotation and before the motor 4 stops the second reverse rotation.

In the present embodiment, the motor 4 is a brushless dc motor, and the controller 6 is configured to control the energization timing of each phase of stator winding of the motor 4 to adjust the rotation direction of the motor 4, in other words, when the motor 4 is required to be switched from the forward rotation to the reverse rotation or from the reverse rotation to the forward rotation, the energization timing of each phase of stator winding of the motor 4 may be changed by the controller 6, and the manner in which the controller 6 changes the energization timing of each phase of stator winding of the motor 4 may be a software control manner.

In addition, when the motor 4 is a brushless dc motor, the user can conveniently control the rotation speed of the motor 4 by software control. Of course, in the modification of the present embodiment, other types of motors may be used as long as they can rotate forward and backward.

It should be noted that, in the present invention, the controller 6 can be implemented by software, hardware or a combination of software and hardware.

In this embodiment, the controller 6 is fixed on top of the housing 7, and the volute 1, the impeller 3 and the motor 4 are all disposed within the housing 7. In fig. 1, the front cover plate (facing the user) of the housing 7 is removed in order to show the volute 1 inside the housing 7.

In this embodiment, the manner of sending the automatic cleaning instruction to the controller 6 is as follows: a switch (not shown) is provided on the housing 7, which is manually activated by a user to send the automatic cleaning command to the controller 6. The switch can be a touch switch (namely, a human hand is required to be in contact with the switch when the switch is controlled to be switched on and off), or can be an induction switch (namely, the human hand is not required to be in contact with the switch when the switch is controlled to be switched on and switched off).

In a first modification of the present embodiment, the manner of sending the automatic cleaning instruction to the controller 6 is: a hand-held terminal (e.g., cell phone, Ipad) is used to send the auto-cleaning command to the controller 6.

In this embodiment and the first variation thereof, the user can decide the timing of sending the automatic cleaning instruction to the controller 6 according to the specific situation, so that the range hood V can be automatically cleaned at any time when the range hood V is not working in the smoke extraction mode, and the automatic cleaning function of the oil press V can be flexibly used.

In a second modification of the present embodiment, the manner of sending the automatic cleaning instruction to the controller 6 is: once the range hood V detects that the accumulated working time value of the range hood V in the smoke extraction mode reaches the set time (for example, 20 minutes), the automatic cleaning instruction is automatically sent to the controller 6, so that the oil press V can automatically clean at regular time without starting the automatic cleaning function of the oil press V by a user.

In a third modification of the present embodiment, the manner of sending the automatic cleaning instruction to the controller 6 is: once the range hood V detects that the range hood V stops working in the smoke extraction mode, the range hood V automatically sends the automatic cleaning instruction to the controller 6 immediately or after a set time interval. Therefore, the oil press V can be automatically cleaned quickly and timely after being used, and the problem that grease is accumulated on the volute 1 and the impeller 3 for a long time and is difficult to clean is avoided.

However, in the technical solution of the present invention, the manner of sending the automatic cleaning command to the controller 6 is not limited, and should not be limited to the above-mentioned embodiments.

In this embodiment, the controller 6 is configured to stop cleaning the range hood V when receiving the automatic cleaning stop instruction. In this embodiment, the manner of sending the automatic cleaning stop instruction to the controller 6 is: a switch (not shown) is provided on the housing 7, and the user manually activates the switch to send the automatic cleaning stop command to the controller 6. The switch can be a touch switch (namely, a human hand is required to be in contact with the switch when the switch is controlled to be switched on and off), or can be an induction switch (namely, the human hand is not required to be in contact with the switch when the switch is controlled to be switched on and switched off).

In a first modification of the present embodiment, the manner of sending the automatic cleaning stop instruction to the controller 6 is: the automatic cleaning stop command is sent to the controller 6 by a hand-held terminal (e.g., cell phone, Ipad).

In this embodiment and the first modification thereof, the user can decide the timing of sending the automatic cleaning stop instruction to the controller 6 according to the specific situation, so that the automatic cleaning of the range hood V can be finished at any time, and the automatic cleaning time of the oil press V can be flexibly adjusted.

In a second modification of the present embodiment, the manner of sending the automatic cleaning stop instruction to the controller 6 is: once the range hood V detects that the automatic cleaning time reaches the set time (for example, 30 minutes), the automatic cleaning stop instruction is automatically sent to the controller 6, so that the oil press V can finish the automatic cleaning at regular time without a user finishing the automatic cleaning function of the oil press V.

However, in the technical solution of the present invention, the manner of sending the automatic cleaning stop instruction to the controller 6 is not limited, and should not be limited to the above-mentioned embodiments.

Second embodiment

The difference between the second embodiment and the first embodiment is that: in the automatic cleaning method of the range hood of the second embodiment, as shown with continued reference to fig. 1 to 2, the impeller 3 is driven to rotate in reverse a times, a being less than N, before the volute 1 is heated; then, the impeller 3 is driven to rotate in reverse B times while the scroll casing 1 is heated, a + B is equal to N, that is, the starting time of the scroll casing 1 is heated is not later than the starting time of the last B times reverse rotation of the impeller 3, and the stopping time of the scroll casing 1 is heated is not earlier than the stopping time of the last reverse rotation of the impeller 3.

In a first variation of the present embodiment, the impeller 3 is driven to rotate in reverse a times, a being less than N, before the volute 1 is heated; then, the impeller 3 is driven to rotate in reverse C times after the completion of the heating of the scroll casing 1, and a + C is equal to N, that is, the stop timing at which the scroll casing 1 is heated is not earlier than the start timing of the C-last rotation of the impeller 3.

In the second modification of the present embodiment, the impeller 3 is driven to rotate reversely a times before the volute 1 is heated; then, the impeller 3 is driven to rotate reversely B times while heating the scroll casing 1; after the heating of the volute 1 is completed, the impeller 3 is driven to rotate reversely C times, a + B + C is equal to N, that is, the starting time of the heating of the volute 1 is not later than the starting time of the reverse rotation of the impeller 3 at the last B + C times, the stopping time of the heating of the volute 1 is not earlier than the stopping time of the reverse rotation of the impeller 3 at the last a + B times, and the stopping time of the heating of the volute 1 is not later than the starting time of the reverse rotation of the impeller 3 at the last C times.

Compared with the technical solution of the first embodiment, the technical solution of the second embodiment and its modified examples has the following advantages: drive impeller 3 reversal A times before heating spiral case 1, can be tentatively get rid of the less grease of adhesive force on spiral case 1, realized the first cleaning of impeller 3. Before volute 1 is heated, though there is drive impeller 3 reversal A times in order to clean impeller 3, there is the possibility that some grease can't be thrown away because of the adhesive force is too strong on impeller 3, and when volute 1 is heated, the produced partial heat of volute 1 can conduct to impeller 3 for the adhesive force of grease can reduce or even probably can melt on impeller 3, through drive impeller 3 reversal a plurality of times when heating volute 1 or afterwards, can realize impeller 3 reversal on throwing away remaining grease on impeller 3 to volute 1 during a plurality of times, realized impeller 3's secondary cleaning, and then improved impeller 3's cleaning performance.

In a specific embodiment of this embodiment, a is equal to 1 and N is equal to 2, i.e. in the automatic cleaning method of the range hood V, the impeller 3 is driven to rotate in reverse twice, and the impeller 3 is driven to rotate in reverse for the first time before the volute 1 is heated. After the impeller 3 rotates reversely for the first time, the volute 1 is heated, the impeller 3 is driven to rotate reversely for the second time while the volute 1 is heated, the starting time of heating the volute 1 is not later than the starting time of rotating the impeller 3 for the last time, and the stopping time of heating the volute 1 is not earlier than the stopping time of rotating the impeller 3 for the last time. After the heating of the scroll casing 1 is completed, the impeller 3 is driven to rotate forward. The time of each reverse rotation of the impeller 3, the time of the forward rotation of the impeller 3 and the time of heating the volute 1 are fixed, so that the automatic cleaning method of the range hood V is simpler and has stronger operability.

Of course, in the present embodiment and its modifications, a may be 2 or more and N may be 3 or more.

The difference between the range hood of the second embodiment and the range hood of the first embodiment is a controller 6. In the second embodiment, the controller 6 controls the motor 4 to rotate reversely a times, a being smaller than N, before controlling the heating element 5 to generate heat; then, the controller 6 controls the motor 4 to rotate reversely B times, a + B being equal to N, while controlling the heating element 5 to generate heat, that is, the start timing of the heating element 5 to generate heat is not later than the start timing of the last B-th reverse rotation of the motor 4, and the stop timing of the heating element 5 to generate heat is not earlier than the stop timing of the last reverse rotation of the motor 4.

In the first modification of the present embodiment, the motor 4 is controlled to rotate in reverse a times, a being less than N, before the heating element 5 is controlled to generate heat; then, after the heating element 5 is controlled to generate heat, the motor 4 is controlled to rotate in reverse C times, and a + C is equal to N, that is, the heating element 5 stops generating heat no earlier than the starting time of the last C reverse rotation of the motor 4.

In the second modification of the present embodiment, the motor 4 is controlled to rotate in reverse a times before the heating element 5 is controlled to generate heat; then, the motor 4 is controlled to rotate reversely for B times while the heating element 5 is controlled to generate heat; after the heating element 5 is controlled to generate heat, the motor 4 is controlled to rotate reversely for C times, and A + B + C is equal to N, namely, the heating element 5 generates heat at the starting time which is not later than the starting time of the last B + C reverse rotation of the motor 4, the heating element 5 generates heat at the stopping time which is not earlier than the stopping time of the A + B reverse rotation of the motor 4, and the heating element 5 generates heat at the stopping time which is not later than the starting time of the last C reverse rotation of the motor 4.

In a specific embodiment of this embodiment, a is equal to 1 and N is equal to 2, i.e. the controller 6 controls the motor 4 to rotate in reverse twice, and controls the motor 4 to rotate in reverse for the first time before controlling the heating element 5 to heat up. After the motor 4 is controlled to rotate reversely for the first time, the heating element 5 is controlled to generate heat, the motor 4 is controlled to rotate reversely for the second time while the heating element 5 is controlled to generate heat, the heating element 5 generates heat at the starting time which is not later than the starting time of the last reverse rotation of the motor 4, and the heating element 5 generates heat at the stopping time which is not earlier than the stopping time of the last reverse rotation of the motor 4. After controlling the heating element 5 to generate heat, the controller 6 controls the motor 4 to rotate forward. The time of each reverse rotation of the motor 4, the time of the forward rotation of the motor 4 and the time of heating the volute 1 are fixed, so that the automatic cleaning method of the range hood V is simpler and has stronger operability.

Third embodiment

The difference between the third embodiment and the first embodiment is that: in the automatic cleaning method of the range hood of the third embodiment, as shown in fig. 1 to 2, the impeller 3 is driven to reversely rotate B times while the volute 1 is heated, where B is equal to N, that is, the starting time of the volute 1 being heated is no later than the starting time of the impeller 3 being reversely rotated for the first time, and the stopping time of the volute 1 being heated is no earlier than the stopping time of the impeller 3 being reversely rotated for the last time.

In the technical scheme of this embodiment, on the one hand, at least some grease on the impeller 3 when reversing can be thrown to the volute 1 under the effect of centrifugal force, thereby realizing the cleanness of the impeller 3. On the other hand, heating spiral case 1 and driving impeller 3 to rotate reversely can throw remaining grease on impeller 3 to spiral case 1, and then has improved impeller 3's clean effect, and specific reason refers to the second embodiment, and no longer repeated here.

In a modification of the present embodiment, B is smaller than N, and the impeller 3 is driven to rotate in reverse C times after the completion of heating the scroll casing 1, with B + C equal to N.

The difference between the range hood of the third embodiment and the range hood of the first embodiment is a controller 6. In the third embodiment, the controller 6 controls the motor 4 to rotate reversely B times, B being equal to N, while controlling the heating element 5 to generate heat, i.e., the heating element 5 generates heat at a start timing not later than the start timing of the first reverse rotation of the motor 4, and the heating element 5 generates heat at a stop timing not earlier than the stop timing of the last reverse rotation of the motor 4.

In the modified example of the present embodiment, B is smaller than N, and the controller 6 controls the motor 4 to rotate in reverse C times after controlling the heating element 5 to generate heat, where B + C is equal to N.

Fourth embodiment

The difference between the fourth embodiment and the first embodiment is that: in the automatic cleaning method of the range hood of the fourth embodiment, as shown with continued reference to fig. 1 to 2, the impeller 3 is driven to rotate reversely C times after the completion of the heating of the scroll casing 1, C being equal to N.

It should be noted that, in the second to fourth embodiments and the modifications of each embodiment, please refer to the first embodiment and all modifications of the first embodiment for the sequence between the step of driving the impeller to rotate forward, the step of driving the impeller to rotate backward, and the step of heating the volute, and no further description is given here.

The difference between the range hood of the fourth embodiment and the range hood of the first embodiment is a controller 6. In the fourth embodiment, the controller 6 controls the motor 4 to rotate reversely C times, C being equal to N, after controlling the heating element 5 to heat up.

Fifth embodiment

The difference between the fifth embodiment and the first embodiment is that: in the automatic cleaning method of the range hood according to the fifth embodiment, as shown in fig. 1 to 2, while the impeller 3 is driven to rotate in the reverse direction N times and the impeller 3 is driven to rotate in the forward direction, the volute 1 is heated, that is, the starting time of the first rotation of the impeller 3 is not later than the starting time of the heating of the volute 1, and the stopping time of the forward rotation of the impeller 3 is not earlier than the stopping time of the heating of the volute 1.

Compared with the technical solution of the first embodiment, the technical solution of the fifth embodiment has the following advantages: on one hand, at least part of grease on the impeller 3 during reverse rotation can be thrown onto the volute 1 under the action of centrifugal force, so that the cleaning of the impeller 3 is realized. On the other hand, heating spiral case 1 and driving impeller 3 to rotate reversely can throw remaining grease on impeller 3 to spiral case 1, and then has improved impeller 3's clean effect, and specific reason refers to the second embodiment, and no longer repeated here. In addition, the impeller 3 is driven to rotate forwards while the volute 1 is heated, so that the grease on the volute 1 can be melted, the melted grease still remained on the volute 1 can be extruded out of the volute 1 and then flows into the oil collecting device 2, the possibility that the melted grease is remained on the volute 1 is reduced, and the cleaning effect of the volute 1 is improved.

The difference between the range hood of the fifth embodiment and the range hood of the first embodiment is a controller 6. In the fifth embodiment, the controller 6 controls the heating element 5 to generate heat while controlling the motor 4 to rotate in the reverse direction N times and controlling the motor 4 to rotate in the forward direction, that is, the start timing of the first reverse rotation of the motor 4 is not later than the start timing of the heat generation of the heating element 5, and the stop timing of the forward rotation of the motor 4 is not earlier than the stop timing of the heating element 5.

In addition, the invention also provides a kitchen appliance which comprises the range hood, so that the kitchen appliance has the function of the range hood.

In this embodiment, the kitchen appliance is an integrated range, which further includes a range, a storage cabinet, and the like.

In a variation of this embodiment, the kitchen appliance further includes an air conditioning system, so that the kitchen appliance further has an air conditioning function. In another variation of this embodiment, the kitchen appliance further includes a display on which information such as recipes can be read.

In the technical solution of the present invention, the type of the kitchen appliance is not limited to the examples, as long as the kitchen appliance has the function of a range hood.

In the present invention, each embodiment is written in a progressive manner, and the differences from the previous embodiments are emphasized, and the same parts in each embodiment can be referred to the previous embodiments.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. An automatic cleaning method of a range hood (V) comprises the steps that the range hood (V) comprises a volute (1), an oil collecting device (2) and an impeller (3) located in the volute (1);

characterized in that the automatic cleaning method comprises: driving the impeller (3) to rotate reversely so as to throw at least part of grease on the impeller (3) onto the volute (1), wherein the direction of rotation of the impeller (3) when the impeller (3) rotates reversely is opposite to the direction of rotation of the impeller (3) of the range hood (V) in a smoke extraction mode; heating the volute (1) to melt the grease attached to the volute (1) and further flow into the oil collecting device (2);

the rotating speed of the impeller (3) in the reverse rotation is a set rotating speed, and the set rotating speed is greater than the rotating speed of the impeller (3) of the range hood (V) in the smoke extraction mode;

after the volute (1) is heated, driving the impeller (3) to rotate reversely for C times, wherein C is less than or equal to 1 and is less than or equal to N;

a sensor is arranged and used for detecting the vibration of the impeller (3), and when the vibration degree of the impeller (3) is different according to the detection of the sensor, the time for the motor (4) to reversely rotate is correspondingly adjusted; alternatively, another sensor is provided which detects a change in the mass of the impeller (3), and when the change in the mass of the impeller (3) is different, indicating a different level of grease on the impeller (3), the time for reversal of the motor (4) is adjusted accordingly.

2. The automatic cleaning method according to claim 1, wherein driving the impeller (3) in reverse comprises: driving the impeller (3) to rotate reversely N times, wherein N is greater than or equal to 1, and when N is greater than or equal to 2, the impeller (3) rotates reversely for the N times intermittently.

3. The automated cleaning method according to claim 2, wherein the impeller (3) is driven to rotate in reverse a times before the heating, 1 ≦ a ≦ N; and/or the presence of a gas in the gas,

driving the impeller (3) to rotate in reverse B times while heating, wherein 1 ≦ B ≦ N.

4. The automated cleaning method of claim 1, further comprising: heating the impeller (3) to melt the grease adhering to the impeller (3).

5. A range hood (V) comprises a volute (1), an oil collecting device (2), an impeller (3) positioned in the volute (1) and a motor (4) for driving the impeller (3) to rotate;

characterized in that, lampblack absorber (V) still includes:

a heating element (5) at least for heating the volute (1);

the controller (6) is used for controlling the motor (4) to rotate reversely according to the received automatic cleaning instruction so as to throw at least part of grease on the impeller (3) onto the volute (1), and the direction of the motor (4) when the motor (4) rotates reversely is opposite to the direction of the motor (4) of the range hood (V) in the smoke extraction mode; the controller (6) is also used for controlling the heating element (5) to generate heat according to the automatic cleaning instruction so as to heat the volute (1), so that the grease attached to the volute (1) is melted and flows into the oil collecting device (2);

the controller (6) is used for controlling the motor (4) to rotate reversely at a set rotating speed, and the set rotating speed is greater than the rotating speed of the motor (4) of the range hood (V) in a smoke extraction mode;

controlling the motor (4) to rotate reversely for C times after the heating element (5) is controlled to heat, wherein C is less than or equal to 1 and less than or equal to N;

6. A hood (V) according to claim 5, characterized by the controller (6) being adapted to control the motor (4) to rotate backwards N times according to said automatic cleaning command, N being greater than or equal to 1, when N being greater than or equal to 2, the controller (6) being adapted to control the motor (4) to rotate backwards N times intermittently.

7. The range hood (V) according to claim 6, characterized in that said controller (6) is also adapted to:

controlling the motor (4) to rotate in reverse A times before controlling the heating element (5) to generate heat, wherein A is less than or equal to 1 and less than or equal to N; and/or the presence of a gas in the gas,

and controlling the motor (4) to rotate reversely for B times while controlling the heating element (5) to generate heat, wherein B is larger than or equal to 1 and smaller than or equal to N.

8. A hood (V) according to claim 5, characterized in that said heating element (5) is also used to heat said impeller (3) to melt said grease adhering to said impeller (3).

9. A hood (V) according to claim 5, characterized in that said motor (4) is a brushless DC motor, said controller (6) being adapted to control the energization timing of each phase of stator windings of the motor (4) to adjust the direction of rotation of said motor (4).

10. A kitchen appliance, characterized in that it comprises a hood (V) according to any one of claims 5 to 9.

11. The kitchen appliance of claim 10, wherein the kitchen appliance is an integrated cooker.