CN111304870B - Washing and drying integrated machine with batting cleaning function and washing control method thereof - Google Patents

Abstract

The present invention discloses a washing and drying machine with a fluff removal function and a cleaning control method thereof, wherein the washing and drying machine comprises a cylinder, a condensing chamber, a fan, a heating chamber and a flushing assembly, wherein the flushing assembly comprises a water pipe and a control valve for controlling the on and off of the water pipe; the water pipe has a water inlet end and a water outlet end, wherein the water outlet end extends into the volute and is arranged adjacent to the fan outlet, and the inner water outlet end is arranged adjacent to the root of the blade, and the water spraying range of the inner water outlet end covers at least part of the windward surface of the first target blade, and the tangent of the tail of the first target blade extends into the fan outlet. The present invention adopts a method of flushing the fan impeller with water flow to achieve the purpose of cleaning the lint in the air duct, especially in the heating chamber, and improve the drying efficiency of the machine; the water flow spray is coordinated with the rotation of the impeller to ensure that each blade is flushed, especially when the water flow is not pressurized by the water pump, a stronger flushing water flow can be formed to improve the flushing effect.

Description

A washing and drying machine with lint removal function and a cleaning control method thereof

Technical Field

The invention relates to a washing and drying machine with a lint removal function and a cleaning control method thereof, belonging to the technical field of clothes dryers and washing machines.

Background Art

When the washer-dryer is drying clothes, a lot of fluff will be generated. These fluffs are intercepted by the high-speed rotating impeller in the evaporation circulation air duct and hang on the impeller, or intercepted by the heating element in the heating chamber. The fluff hanging on the fan blades will reduce the dynamic balance performance of the fan impeller, causing the fan to vibrate, reduce the speed, and reduce the air volume, affecting the drying effect. The fluff hanging on the heating element will make the heat exchange efficiency worse. Especially when there are too many fluffs wrapped around the blades, although the impeller rotates, the air volume is very small or even no air is emitted, causing the drying heater to dry burn. In order to solve the above problems, a filter is usually set in the circulating air duct to filter the fluff. However, the filter needs to be cleaned manually regularly, which is time-consuming and laborious. Moreover, since the fluff is small, the filter set in the circulating air duct needs to be fine, which further increases the resistance of the air duct, reduces the wind force and air volume, reduces the ventilation capacity of the circulating air duct, causes the air to be weak, and reduces the drying efficiency. In addition, the method of using filters to remove lint cannot remove the scale residue calcified in the circulating air duct during the drying process, as well as the rust on the surface of aluminum metal parts. Although some machines are currently equipped with air duct flushing structures, they are mainly focused on flushing the condensation chamber or filter parts. There are relatively few technologies for flushing the heating chamber, which cannot effectively solve the problem.

It should be noted that the above contents belong to the technical knowledge of the inventor and do not necessarily constitute prior art.

Summary of the invention

The purpose of the present invention is to solve the problems existing in the prior art. By providing a washing and drying machine with a lint removal function and a cleaning control method thereof, scale calcified in the heating chamber during the drying process, rust on metal parts and lint residues can be removed, thereby improving the drying efficiency of the machine.

The present invention achieves the above-mentioned purpose by adopting the following technical solutions:

A washer-dryer with a lint removal function, comprising a barrel, a condensing chamber, a fan and a heating chamber, the fan comprising a volute and an impeller arranged in the volute, the impeller comprising a wheel disc and blades arranged in a ring shape on the periphery of the wheel disc, the volute being surrounded by a front plate, a rear plate and a side plate, the fan air inlet and the fan air outlet being respectively arranged on the rear plate and the side plate, the blades comprising a blade root portion, a blade middle portion and a blade tail portion which are sequentially away from the wheel disc axis along the radial direction of the wheel disc, the blades having a windward surface and a leeward surface, the washer-dryer further comprising a flushing assembly, the flushing assembly comprising a water pipe and a control valve for controlling the on-off of the water pipe;

The water pipe has a water inlet end and a water outlet end, the water outlet end extends into the volute and is arranged adjacent to the fan outlet, the water outlet end at least includes an inner water outlet end, the inner water outlet end is arranged adjacent to the root of the blade at the fan outlet, the water spraying range of the inner water outlet end covers at least part of the windward surface of the first target blade, and the tangent of the tail of the first target blade extends into the fan outlet.

In a preferred embodiment, the tangent line of the first target blade tail portion extends to a region of 1/3 to 2/3, preferably a region of 1/2 to 2/3, in the middle of the cross section of the fan outlet.

In a preferred embodiment, the water outlet direction of the inner water outlet end is toward between the middle part and the tail part of the first target blade, preferably toward the middle part of the first target blade.

In a preferred embodiment, the water outlet end also includes an outer water outlet end, which is arranged near the tail of the blade at the air outlet of the fan, and the water spraying range of the outer water outlet end covers at least part of the leeward side of the second target blade, and the second target blade is close to the first target blade, or partially or completely overlaps with the first target blade.

In a preferred embodiment, the water outlet direction of the outer water outlet end is toward between the middle part of the blade and the root part of the blade of the second target blade, preferably toward the middle part of the blade.

In a preferred embodiment, the inner water outlet and the outer water outlet are connected to the water inlet through the first water pipe and the second water pipe respectively; the control valve includes a first control valve and a second control valve, which are used to control the opening and closing of the first water pipe and the second water pipe respectively.

In a preferred embodiment, the positions of the heating chamber, the fan, and the condensing chamber are sequentially lowered.

In a preferred embodiment, the blade is an arc-shaped blade, and the arc-shaped concave surface of the arc-shaped blade is the windward surface.

On the other hand, the present application also provides a cleaning control method based on the above-mentioned washer-dryer with lint removal function, comprising the following steps:

S1, controlling the first water outlet and the second water outlet to spray water simultaneously or alternately, and the spraying process is intermittent or continuous;

S2, after step S1 is completed, the washer-dryer is controlled to execute a washing program or a rinsing program to discharge the sewage in the inner cavity of the drum;

S3. After step S2 is completed, the washer-dryer is controlled to execute a rinsing program.

In a preferred embodiment, before step S1, the method further includes step S0, starting the fan, and keeping the fan working intermittently or continuously until step S1 is completed.

In a preferred embodiment, after step S3, step S4 is further included, controlling the washer-dryer to execute a drying program.

The beneficial effects of this application include but are not limited to:

(1) The method of flushing the fan impeller with water flow is used to clean the air duct, especially the lint in the heating chamber, and the scale, rust of metal parts and lint residue calcified in the heating chamber during the drying process can be removed at the same time, thereby improving the drying efficiency of the machine;

(2) Coordinating the water jet with the impeller rotation ensures that each blade is flushed, especially when the water flow is not pressurized by the water pump, a stronger flushing water flow can be formed to improve the flushing effect;

(3) Reasonably design the water spray direction of the inner and outer water outlets to achieve precise cleaning and save water and electricity;

(4) The overall structure is simple, the components are reliably connected, easy to assemble and disassemble, low cost and long service life.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

FIG1 is a schematic structural diagram of a washing and drying machine with lint removal function involved in the present application;

FIG2 is a schematic diagram of a partial internal structure of a washer-dryer with lint removal function involved in the present application;

FIG3 is a schematic diagram of a partial internal structure of the washer-dryer with lint removal function in another state of the present application;

FIG4 is a schematic diagram of a partial internal structure of the washer-dryer with lint removal function in another state of the present application;

FIG5 is an enlarged schematic diagram of the structure of portion A in FIG4 ;

FIG6 is an enlarged structural diagram of blades in the integrated washer-dryer with lint removal function involved in the present application;

In the figure, 100 is a cylinder; 200 is a condensing chamber; 300 is a fan; 310 is a wheel; 320 is a front plate; 330 is a rear plate; 340 is a side plate; 350 is an air inlet of the fan; 360 is an air outlet of the fan; 371 is a blade root; 372 is a blade middle; 373 is a blade tail; 3710 is a first target blade; 3720 is a second target blade; 3701 is a windward side; 3702 is a leeward side; 400 is a heating chamber; 510 is a water inlet; 521 is an inner water outlet; 522 is an outer water outlet; 5210 is a first water pipe; 5220 is a second water pipe; 5211 is a first control valve; 5221 is a second control valve.

DETAILED DESCRIPTION

In order to clearly illustrate the technical features of the present solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

It should be noted that many specific details are described in the following description to facilitate a full understanding of the present invention, but the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

The washer-dryer described in the present application refers to a washing machine with a drying function. Generally, the temperature of the clothes is increased by hot air to evaporate the moisture inside the clothes, which is then discharged outside the machine to dry the clothes.

As shown in Figures 1 and 2, the washing and drying machine with lint removal function provided by the present application includes a barrel 100, a condensing chamber 200, a fan 300 and a heating chamber 400. Among them, an outer barrel (not shown) is arranged outside the barrel 100, and an air outlet connected to the condensing chamber 200 is opened on the barrel wall of the barrel 100; the heating chamber 400 realizes the heating function through the built-in heating pipe, and the condensing chamber 200 realizes the cooling function through air or water flow, and a condensed water drainage hole is formed at the bottom of the condensing chamber 200. It can be understood that in order to dry the clothes in the inner barrel, the barrel 100 and the condensing chamber 200, the fan 300, and the heating chamber 400 are mutually connected to form an evaporation circulation air duct. When working, the fan 300 draws the gas in the barrel 100 from the air outlet into the condensing chamber 200 for condensation, then introduces it into the heating chamber 400 for heating, and then sends it back to the barrel 100 from the air inlet, forming an evaporation cycle to dry the clothes.

As shown in Fig. 2, Fig. 3 and Fig. 4, the fan 300 includes a volute and an impeller disposed in the volute, and the impeller includes a wheel disc 310 and blades arranged in a ring shape on the periphery of the wheel disc 310; the volute is surrounded by a front plate 320, a rear plate 330 and a side plate 340, and the fan air inlet 350 and the fan air outlet 360 are respectively disposed on the rear plate 330 and the side plate 340; as shown in Fig. 6, the blade is composed of a blade root portion 371, a blade middle portion 372 and a blade tail portion 373 which are radially away from the axis of the wheel disc 310 in sequence, and the blade has a windward surface 3701 and a leeward surface 3702. When the washer-dryer performs drying operations, the fluff will be broken by the high-speed rotating blades, mainly hanging on the blade root portion 371 and the blade tail portion 373 of the blade.

In order to effectively clean the lint in the circulating air duct, the washer-dryer provided in the present application also includes a flushing component, which includes a water pipe and a control valve for controlling the on and off of the water pipe.

As shown in FIG. 5 and FIG. 6 , the water pipe has an inlet end 510 and an outlet end, and the outlet end extends into the volute and is arranged adjacent to the fan outlet 360 and faces the blade surface of the fan. When performing the lint flushing procedure, water flow is introduced from the inlet end 510, and the water flow is introduced into the volute of the fan through the water pipe, and is discharged from the outlet end and sprayed on the blades of the fan. In order to form a target water flow sprayed toward the heating chamber 400 through the cooperation of the blade and the water flow, so as to clean the heating chamber 400, the outlet end should at least include an inner outlet end 521. Specifically, the inner outlet end 521 is arranged at the root portion 371 of the blade adjacent to the fan outlet 360, and the spray range of the inner outlet end 521 must cover at least part of the windward surface 3701 of the first target blade 3710. Among them, the first target blade 3710 is defined as: the tangent of the blade tail part 373 extends to the blade inside the fan outlet 360, that is, the blade within the angle range of α in Figure 5. The centrifugal water flow generated by the blade here is the largest and is easier to be thrown into the heating chamber 400 to flush the heating chamber 400.

After the above conditions are met, the water discharged from the inner water outlet 521 is sprayed onto the windward surface 3701 of the blade. When the fan 300 is not working, the impact force of the water flow sprayed from the inner water outlet 521 on the windward surface 3701 of the blade causes the blade to rotate, and the rotation of the blade reacts to the water flow, so that the water flow is thrown out along the tangent direction of the blade tail part 373 of the blade under the action of centrifugal force, and after washing down the fluff hanging on the blade tail part 373, most of the water flow is discharged from the fan air outlet 360 and enters the heating chamber 400 to clean the fluff in the heating chamber 400, so that the fluff deposits therein and the rust caused by the metal parts in the humid air for a long time and the scale residue calcified in the air duct during the drying process are all removed, and discharged from the heating chamber 400 and enter the cylinder 100; a small part of the water flow flows down along the fan air inlet 350 to flush the condensation chamber 200. When the fan 300 is working, the rotation of the blades causes the water flow impacting the blades to be thrown out from the fan outlet 360 into the heating chamber 400 along the tangential direction of the blades with greater impact force under the action of centrifugal force. At the same time, the wind force generated by the rotation of the fan 300 will also drive the water flow to a certain extent.

The first target blade 3710 is selected as the blade whose tangent line extends from the blade tail portion 373 to the fan outlet 360 because after the water flow is sprayed onto the target blade that meets this requirement, most of it can enter the heating chamber 400 from the fan outlet 360, thereby reducing the amount of water flow, weakening the impact on the rotation of the fan 300 blades, and improving the utilization rate of the water flow.

In order to minimize the resistance of the water flow sprayed from the water outlet to the rotation of the blades, the present application has been carried out after a large number of experiments. In a preferred embodiment, the tangent of the tail portion 373 of the first target blade 3710 is optimized to extend to the 1/3 to 2/3 area in the middle of the cross-section of the fan outlet 360, preferably the 1/2 to 2/3 area, such as the D area in Figure 5, so that as high a proportion of the water flow as possible can enter the heating chamber 400 from the fan outlet 360 to avoid excessive losses caused by the collision of the water flow with other parts of the volute.

In a preferred embodiment, in order to clean the fluff at the blade root 371, the water outlet also includes an outer water outlet 522, and the outer water outlet 522 is arranged near the blade tail 373 of the blade at the fan outlet 360, and the water spraying range of the outer water outlet 522 covers at least part of the leeward surface 3702 of the second target blade 3720. The water flow sprayed from the outer water outlet 522 rushes onto the second target blade 3720, and after washing off the fluff hanging from the blade root 371, most of the water flow is discharged from the fan air inlet 350 into the condensation chamber 200, and the air ducts such as the condensation chamber 200 are washed, and the washed water is discharged from the condensation chamber 200 into the outer cylinder with the fluff. In order to avoid mutual interference between the inner water outlet 521 and the outer water outlet 522 when working at the same time, the inner water outlet 521 and the outer water outlet 522 can be staggered.

As shown in Figure 6, in order to minimize the resistance of the blades to the water flow sprayed from the inner water outlet end 521 and the outer water outlet end 522, the present application has been optimized in a preferred embodiment after a large number of experiments: the water outlet direction of the inner water outlet end 521 is between the middle part 372 and the tail part 373 of the first target blade 3710, and is especially preferably towards the middle part 372 of the first target blade 3710; the water outlet direction of the outer water outlet end 522 is between the middle part 372 and the root part 371 of the second target blade 3720, and is especially preferably towards the middle part 372 of the blade.

The present application does not specifically limit the water outlet structure of the inner water outlet end 521 and the outer water outlet end 522, as long as the water flow can be sprayed toward the first target blade 3710 and the second target blade 3720, and the water spraying area can fully cover the height range of the blades. For example, the water outlet can be a small hole type or a slit type, but the overall water spraying direction must be along the extension direction of the blades and cannot rush toward the inner wall of the volute.

As shown in Figures 2 and 3, in a preferred embodiment, the inner water outlet end 521 and the outer water outlet end 522 are connected to the water inlet end 510 through the first water pipe 5210 and the second water pipe 5220 respectively; the control valve includes a first control valve 5211 and a second control valve 5221, which are used to control the opening and closing of the first water pipe 5210 and the second water pipe 5220 respectively, and the first control valve 5211 and the second control valve 5221 can use solenoid valves.

Relying on the common structure of the washer-dryer, the water inlet end 510 of the water pipe is connected to the water inlet pipeline of the washer-dryer, the water inlet pipeline is connected to the tap water network, and the first water pipe 5210 and the second water pipe 5220 are connected to the original water inlet of the washer-dryer by adding a water inlet valve.

In order to simplify the assembly work and bring the first water pipe 5210 and the second water pipe 5220 as close as possible to reduce the impact on the overall structure of the washer-dryer, when selecting the second target blade 3720, the present application preferably selects an area close to the first target blade 3710, or partially or completely overlaps with the first target blade 3710.

As shown in Fig. 1 and Fig. 2, in a preferred embodiment, the positions of the heating chamber 400, the fan 300, and the condensing chamber 200 are successively lowered, the fan air inlet 350 is arranged on the rear plate 330, and the rear plate 330 of the volute of the fan 300 is fixed on the cylinder 100. The water flow for flushing the heating chamber 400 is powered by the centrifugal force of the rotating blades, and then flows downward into the cylinder 100 due to the gravitational potential energy, and the water flow for flushing the condensing chamber 200 also automatically flows downward due to the gravitational potential energy.

Furthermore, when the blade is an arc-shaped blade, and the arc-shaped concave surface of the arc-shaped blade is the windward surface 3701, the kinetic energy of the water flow sprayed onto the windward surface 3701 of the blade by the inner water outlet end 521 is the largest when it is thrown out by the centrifugal force of the blade, and the flushing effect on the heating chamber 400 is the best.

Under the premise of a certain pressure in the tap water network, in order to increase the water spray pressure at the water outlet and achieve a better flushing effect, it is preferred to set a reduced diameter section on the first water pipe 5210 and the second water pipe 5220 along the direction of water flow. As shown in Figures 2 and 3, taking into account the processing and assembly process, the first water pipe 5210 and the second water pipe 5220 involved in this application respectively adopt the following structures:

The water inlet end 510 is connected to the first water pipe 5210 and the second water pipe 5220 through the first control valve 5211 and the second control valve 5221 respectively. The first water pipe 5210 and the second water pipe 5220 are provided with a reduced diameter section, and a reducer is usually selected. The first water pipe 5210 and the second water pipe 5220 extend into the volute from the front plate 320 respectively. After the first water pipe 5210 is extended into the volute, it bends from the lower part of the blade to the blade root part 371, and the second water pipe 5220 extends into the volute and is arranged at the blade tail part 373. The first water pipe 5210 and the second water pipe 5220 are sealed with the front plate 320 through a sealing gasket or a rubber plug, and are positioned to prevent rotation.

On the other hand, the present application also provides a cleaning control method based on the above-mentioned washer-dryer with lint removal function, comprising the following steps:

S1. Control the first water outlet end and the second water outlet end to spray water simultaneously or alternately, and the water spraying process is intermittent or continuous; specifically, the inner water outlet end 521 and the outer water outlet end 522 are preferably operated separately, but can also operate simultaneously, which will only bring greater resistance to the rotating impeller, causing the impeller to rotate slower or stop; in addition, because the torque of the fan used in the washer-dryer is relatively small, continuously spraying water on the blades will cause the impeller to slow down or stop, so the water spraying is preferably intermittent; during the gap when the fan is not working, the water sprayed on the blades can still be thrown out by the inertia of the impeller rotation; the working status of the inner water outlet end 521 and the outer water outlet end 522 is achieved by controlling the opening and closing of the first control valve 5211 and the second control valve 5221.

S2. After step S1 is completed, the washer-dryer is controlled to execute a washing program or a rinsing program to discharge the sewage in the inner cavity of the drum 100.

S3. After step S2 is completed, the washer-dryer is controlled to execute a rinsing program.

In order to avoid water accumulation in the evaporation circulation air duct, step S3 is followed by step S4, which controls the washer-dryer to execute a drying program.

The above steps may be performed once or multiple times according to the hanging condition of the fluff on the blades of the fan 300.

In actual application, even if the impeller of the fan does not rotate, the water flow sprayed from the inner water outlet end 521 hits the windward surface 3701 of the blade, and is guided by the curved arc of the blade, and can also be discharged from the tangent direction of the blade tail part 373 and rush to the heating chamber 400. Alternatively, when the fan is not powered on, the water flow sprayed from the inner water outlet end 521 hits the windward surface 3701 of the blade, and can also drive the impeller to rotate, and throw the water flow out from the fan outlet 360, but the rotation speed is lower, but it can also achieve the purpose of flushing the air duct.

However, in order to improve the flushing efficiency, in a preferred embodiment, step S0 is also included before step S1, starting the fan, and keeping the fan working intermittently or continuously until step S1 is completed. After the fan is started, the water flow is thrown into the air duct by the centrifugal force of the high-speed rotation of the impeller, and the relative speed between the water flow and the blades can be increased to improve the flushing effect. When the washer-dryer is produced, steps S0-S4 can be set as an independent lint removal mode. Other structures of the washer-dryer according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

In the description of the present invention, it is necessary to understand that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

The above specific implementation manner cannot be used as a limitation on the protection scope of the present invention. For those skilled in the art, any substitution, improvement or change made to the implementation manner of the present invention falls within the protection scope of the invention.

The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims (7)

1. The washing and drying integrated machine comprises a barrel, a condensing chamber, a fan and a heating chamber, wherein the fan comprises a volute and an impeller arranged in the volute, the impeller comprises a wheel disc and blades annularly arranged on the periphery of the wheel disc, the volute is surrounded by a front plate, a rear plate and a side plate, a fan air inlet and a fan air outlet are respectively formed in the rear plate and the side plate, the blades are formed by a blade root part, a middle part and a tail part which are radially and sequentially far away from the axle center of the wheel disc along the wheel disc, and the blades are provided with a windward side and a leeward side;

The water pipe is provided with a water inlet end and a water outlet end, the water outlet end stretches into the volute and is arranged adjacent to the air outlet of the fan, and the water outlet end at least comprises an inner water outlet end;

The inner water outlet end is arranged near the blade root part of the blade at the air outlet of the fan, the water spraying range of the inner water outlet end covers at least part of the windward side of the first target blade, and the tangent line of the blade tail part of the first target blade extends to a 1/3 to 2/3 area in the middle of the cross section of the air outlet of the fan; the water outlet direction of the inner water outlet end faces to the position between the middle part of the first target blade and the tail part of the first target blade; when the fan does not work, the impact force of water flow sprayed from the inner water outlet end to the windward side of the first target blade causes the first target blade to rotate, the first target blade rotates to react with the water flow, the water flow is thrown out along the tangential direction of the tail part of the first target blade under the action of centrifugal force, and most of water flow is discharged from the air outlet of the fan after the flock hung on the tail part is flushed down, enters the heating chamber and is discharged from the heating chamber to enter the cylinder; a small part of water flows downwards along the air inlet of the fan to wash the condensing chamber; when the fan works, the first target blade rotates to enable water flow impacted on the first target blade to be thrown out into the heating chamber from the air outlet of the fan along the tangential direction of the first target blade with larger impact force under the action of centrifugal force;

The water outlet end further comprises an outer water outlet end, the outer water outlet end is arranged close to the tail part of the blade at the air outlet of the fan, the water spraying range of the outer water outlet end covers at least part of the leeward surface of the second target blade, and the second target blade is close to the first target blade or partially or completely overlapped with the first target blade; the water outlet direction of the outer water outlet end faces to the position from the middle part of the second target blade to the blade root part; the water flow sprayed from the water outlet end at the outer side is flushed onto the second target blade, and most of the water flow is discharged from the air inlet of the fan to enter the condensing chamber after the flock hung on the blade root part is flushed down;

The positions of the heating chamber, the fan and the condensing chamber are sequentially reduced, the blades are arc-shaped blades, and the arc-shaped concave surfaces of the arc-shaped blades are windward surfaces.

2. The flush control method according to claim 1, wherein a tangent line of a trailing portion of the first target blade extends to a region of 1/2 to 2/3 of a middle portion of a cross section of the air outlet of the blower.

3. The flush control method according to claim 1, wherein the water outlet direction of the inner water outlet end is toward a mid-blade portion of the first target blade.

4. The flush control method according to claim 1, wherein the water outlet direction of the outer water outlet end is toward a mid-blade portion of the second target blade.

5. The flush control method according to claim 1, wherein the inner water outlet end and the outer water outlet end are connected to the water inlet end through a first water pipe and a second water pipe, respectively; the control valve comprises a first control valve and a second control valve which are respectively used for controlling the on-off of the first water pipe and the second water pipe.

6. The flush control method according to claim 1, comprising the steps of:

S1, controlling the first water outlet end and the second water outlet end to spray water simultaneously or alternately, wherein the water spraying process is intermittent or continuous;

S2, after the step S1 is finished, controlling the washing and drying integrated machine to execute a washing program, and discharging sewage in the inner cavity of the cylinder;

And S3, after the step S2 is finished, controlling the washing and drying integrated machine to execute a rinsing program.

7. The flush control method according to claim 6, wherein,

Before the step S1, the method further comprises the steps of S0, starting the fan, and keeping the fan intermittently or continuously working until the step S1 is finished;

And step S4, controlling the washing and drying integrated machine to execute a drying program is further included after the step S3.