CN111973121B

CN111973121B - Spraying system for cleaning machine and cleaning machine

Info

Publication number: CN111973121B
Application number: CN202010725975.6A
Authority: CN
Inventors: 施郑赞
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2020-07-24
Filing date: 2020-07-24
Publication date: 2022-05-17
Anticipated expiration: 2040-07-24
Also published as: CN111973121A

Abstract

The invention relates to a spraying system for a cleaning machine and the cleaning machine, wherein the spraying system for the cleaning machine comprises a spraying arm, a water collecting cavity is formed in the spraying arm in a hollow manner, and a water inlet communicated with the water collecting cavity is formed in the spraying arm; the power assembly is arranged at a water inlet of the spray arm and is used for pumping water into the water collecting cavity through the water inlet at a high speed; the spraying device is characterized by further comprising a water outlet channel, wherein the water outlet channel is arranged on the spraying arm, a pressure cavity used for pressurizing water is arranged in the water outlet channel, the pressure cavity is communicated with the water collecting cavity, the pressure cavity is located at the downstream of the water collecting cavity along a fluid flow path, and the water outlet channel is provided with a water outlet with an upward opening and communicated with the pressure cavity. When water is pumped into the water collecting cavity through the power assembly, water flows upwards through the water outlet after being pressurized through the pressure cavity, the outflow speed of water is increased, the lift of the water flowing upwards is increased, the secondary cleaning efficiency is improved, and then the cleaning effect is improved.

Description

Spraying system for cleaning machine and cleaning machine

Technical Field

The invention belongs to the technical field of cleaning machines, and particularly relates to a spraying system for a cleaning machine and the cleaning machine.

Background

A dishwasher is an apparatus that sprays cold or hot water onto dishes to remove dirt adhered to the dishes, thereby washing the dishes. A general dishwasher includes a pump and a spray head for spraying washing water, etc. Such a dishwasher usually requires a separate housing and separate components, resulting in a relatively large volume of the dishwasher, which is not suitable for use in households with a large population and a small living area, and thus the household usage rate of the dishwasher is relatively low.

In order to save space and expand the application range of the dishwasher, the prior water tank is modified into a cleaning machine, and the water tank is directly used as a washing space. This type of structure generally provides a rotating spray arm at the bottom of the tank, which is usually connected to a pump body driven by an electric motor. The utility model discloses a cleaning machine as the chinese utility model patent of applicant's prior application, its patent number is ZL201721041956.19 (the publication number is CN208582345U) discloses a cleaning machine, including box, spray arm and can go into the power component in the spray arm with the water pump in the box, the spray arm is located in the box and has water inlet and apopore, power component locates the spray arm below and including the pump case at least, the pump case is connected with the water inlet of spray arm, still includes the bubbler, according to the fluid flow direction, the bubbler is located between spray arm and the pump case and is located the water inlet upper reaches of spray arm. The direct spun water of spray arm apopore can wash tableware or fruit vegetables, but water pressure is not enough probably to appear, when leading to water to spout through the apopore, the lift of water is shorter, and leads to water velocity less, even can strike behind the follow-up box top door body, water drips behind the door body, treats that the secondary cleaning performance of wasing the thing is not good enough.

Accordingly, further improvements to existing cleaning machines are needed.

Disclosure of Invention

The first technical problem to be solved by the present invention is to provide a spraying system for a cleaning machine, which increases the flow rate of outlet water and increases the lift of the outlet water, in view of the current situation of the prior art.

The invention aims to solve the second technical problem of providing the cleaning machine which increases the flow rate of the outlet water and the delivery lift of the outlet water.

The technical scheme adopted by the invention for solving the first technical problem is as follows: a spray system for a cleaning machine includes

The spraying arm is internally hollow to form a water collecting cavity, and a water inlet communicated with the water collecting cavity is formed in the spraying arm;

the power assembly is arranged at a water inlet of the spray arm and is used for pumping water into the water collecting cavity through the water inlet at a high speed;

it is characterized by also comprising:

and the water outlet channel is arranged on the spray arm, is internally provided with a pressure cavity for pressurizing water, is communicated with the water collecting cavity, is positioned at the downstream of the water collecting cavity along a fluid flow path, and is provided with a water outlet with an upward opening and communicated with the pressure cavity.

The form of the water outlet channel is as follows: the spray arm is characterized in that an outlet is formed in the position, close to the center, of the upper wall plate of the spray arm, a cover cap covers the outlet of the spray arm, the cover cap comprises a top plate, a water through hole is formed in the top plate, an extending section is formed by upward extending the periphery of the water through hole, the outlet end of the extending section is the water outlet, a ring wall is formed by downward extending the periphery of the top plate, and an internal flow passage of the cover cap is the water outlet channel.

The pressure chamber can be formed in various forms, and can be arranged horizontally or vertically, but preferably, a transverse plate which is arranged side by side with the top plate and is positioned below the top plate is arranged in the inner cavity of the cover cap, the pressure chamber is formed by enclosing the transverse plate, the top plate and the inner wall surface of the annular wall, and a flow guide channel which is communicated with the pressure chamber and the water inlet is arranged on the position, adjacent to the outer peripheral edge, of the transverse plate.

In order to guide the water flow which flows in a radial dispersed manner and facilitate the subsequent water flow to move upwards along the axial direction, the lower surface of the transverse plate is provided with a plurality of first guide strips, a first flow channel is formed between every two adjacent first guide strips, the water outlet section of each first flow channel is a guide channel, and each first guide strip is spirally arranged along the same direction and is circumferentially arranged at intervals, so that all the first guide strips are integrally arranged in a clockwise or anticlockwise rotating direction.

Specifically, the inner edges of the first guide strips are located on the same circumference.

In order to guide the water flowing out of the first flow channel upwards, a plurality of second flow guide strips are arranged on the upper surface of the transverse plate, a second flow channel is formed between every two adjacent second flow guide strips, the second flow channels are located at the downstream of the flow guide channels along a fluid flow path, and the second flow guide strips are spirally arranged along the same direction at intervals, so that all the second flow guide strips are arranged in a clockwise or anticlockwise rotating direction on the whole.

In order to guide the water flow, the water flow can conveniently flow into the pressure cavity, a guide ring is arranged in the inner cavity of the cover cap, the guide ring is vertically arranged between the transverse plate and the upper wall plate of the spray arm and is annular and positioned on the periphery of the power assembly, and a guide opening communicated with the guide channel is formed between the guide ring and the transverse plate.

Preferably, the upper peripheral edge of the diversion ring is provided with a plurality of V-shaped notches with upward openings, the V-shaped notches are circumferentially arranged at intervals, and the transverse plate and the diversion ring surround and form the diversion port between positions corresponding to the V-shaped notches.

The power assembly has various structural forms, but preferably, the water inlet is arranged on the position close to the center of the bottom of the spray arm, the power assembly comprises a motor and an impeller assembly, the motor is positioned below the water inlet and provided with an output shaft extending upwards, and the impeller assembly is at least partially positioned in the water collecting cavity and is arranged at the upper end of the output shaft of the motor.

The impeller assembly may be of various forms, but preferably comprises a first impeller and a second impeller which are coaxially arranged, the first impeller having a helical flow passage extending helically upwardly for drawing fluid upwardly, the second impeller being located downstream of the first impeller along the fluid flow path, and the second impeller having at least two circumferentially spaced and upwardly extending vertical flow passages which communicate with the helical flow passage. Therefore, the work on the water flow is improved under the action of the first impeller and the second impeller, and the water flow is pumped into the water collecting cavity at a higher speed.

The second impeller has various structural forms, but preferably, the second impeller comprises a central shaft, a shaft hole for the output shaft of the motor to penetrate and fix is formed in the central shaft, at least two blades which are circumferentially arranged at intervals and axially extend are arranged on the circumferential surface of the central shaft, and the vertical flow channel is formed between every two adjacent blades.

The technical scheme adopted by the invention for solving the second technical problem is as follows: a cleaning machine with the spraying system is characterized in that: the washing machine comprises a box body, wherein the box body is provided with a washing cavity which is hollow inside and is opened at the top, and a spraying arm is horizontally and rotatably arranged in the washing cavity at a position close to the bottom.

Compared with the prior art, the invention has the advantages that: be provided with out the water passageway on this cleaning machine's the spray arm, it carries out the pressurized pressure chamber to water to be provided with in the play water passageway, the pressure chamber is linked together with the chamber that catchments, when water goes into the intracavity that catchments through the power component pump, rivers can upwards spout through the delivery port after the pressure chamber pressurizes, the outflow velocity of water has been increased, and then the lift that water upwards flows has been increased, its speed that flows downwards increases when the door body of follow-up rivers impact box, the secondary cleaning's efficiency has been improved, then the cleaning performance has been improved.

Drawings

FIG. 1 is a schematic structural diagram according to a first embodiment of the present invention;

FIG. 2 is a longitudinal cross-sectional view of a portion of the structure of FIG. 1;

FIG. 3 is a schematic perspective exploded view of a portion of the structure of FIG. 1;

FIG. 4 is a schematic structural view of the power assembly and cover of FIG. 1;

FIG. 5 is a schematic view of the structure of FIG. 4 from another angle;

FIG. 6 is a schematic structural view of the second impeller of FIG. 1;

FIG. 7 is a schematic structural view of the centrifugal impeller of FIG. 1;

FIG. 8 is a schematic structural view of the cross plate in FIG. 1;

FIG. 9 is a schematic view of the structure of FIG. 8 at another angle;

FIG. 10 is a schematic view of an assembly structure of the door body and the centrifugal impeller;

FIG. 11 is a schematic perspective exploded view of the partial structure of FIG. 10;

FIG. 12 is a sectional view of the second embodiment;

fig. 13 is a schematic perspective exploded view of a spray arm and a power assembly according to the second embodiment;

FIG. 14 is a schematic perspective exploded view of FIG. 13;

FIG. 15 is a cross-sectional view of FIG. 14;

FIG. 16 is a schematic view of the cover of FIG. 13;

fig. 17 is a schematic structural view of the deflector ring in fig. 13.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

The first embodiment is as follows:

as shown in fig. 1 to 11, a first preferred embodiment of the present invention is shown.

As shown in fig. 9 and 10, the cleaning machine of this embodiment includes a cabinet 1, a door 2, and a shower system. The spraying system for the cleaning machine comprises a spraying arm 3, a power assembly 4, a cover 5, a centrifugal impeller 6 and a transverse plate 7.

As shown in fig. 1 and 2, the cabinet 1 has a washing chamber 11 which is hollow inside and open at the top, and the door 2 covers the open top of the washing chamber 11 to open or close the open top 111. The spray arm 3 is arranged substantially horizontally rotatably in the washing chamber 11 adjacent to the bottom. Specifically, as shown in fig. 2, a water collecting cavity 31 is formed in the spray arm 3, a water inlet 311 communicated with the water collecting cavity 31 is opened at a position near the center of the bottom of the spray arm 3, an outlet 312 is opened at a position near the center of an upper wall plate 3a of the spray arm 3, and a plurality of spray holes 313 arranged at intervals along the length direction of the upper wall plate 3a are opened on the upper wall plate 3a, as shown in fig. 3.

As shown in fig. 2, a diversion bracket 9 is disposed below the spray arm 3 and at a position corresponding to the water inlet 311, the spray arm 3 is substantially horizontally and rotatably limited on the diversion bracket 9, and the spray arm 3 is fixed on the bottom of the washing chamber 11 through the diversion bracket 9, the diversion bracket 9 has a water inlet channel 91 with a hollow interior, the water inlet channel 91 is located at the upstream of the water inlet 311 along the fluid flowing direction, and the water inlet channel 91 is communicated with the water inlet 311.

As shown in fig. 2, the power assembly 4 is disposed at the water inlet 311 of the spray arm 3, and is used for pumping water into the water collecting cavity 31 at a high speed after passing through the water inlet channel 91 and the water inlet 311 in sequence. As shown in fig. 2 to 5, the power assembly 4 includes a motor 41 and an impeller assembly 42. The motor 41 is located under the guide bracket and fixedly connected with the guide bracket 9, the motor 41 has an output shaft extending upwards and penetrating into the water inlet channel 91, and the impeller assembly 42 is at least partially located in the water collecting cavity 31 and is installed at the upper end of the output shaft of the motor 41. Specifically, the impeller assembly 42 includes a first impeller 421 and a second impeller 422 coaxially arranged, wherein the first impeller 421 is located in the water inlet channel 91, the first impeller 421 has a spiral flow passage 4211 spirally extending upward for drawing fluid upward, the second impeller 422 is located downstream of the first impeller 421 along the fluid flow path, the second impeller 422 has at least two vertical flow passages 4223 circumferentially spaced and extending upward, and the vertical flow passages 4223 are communicated with the spiral flow passage 4211.

As shown in fig. 6, the second impeller 422 includes a central shaft 4221, a cross section of the central shaft 4221 is gradually increased from bottom to top, and the cross section of the central shaft is circular. The central shaft 4221 is provided with a shaft hole through which an output shaft of the power supply 41 is fixedly inserted, the circumferential surface of the central shaft 4221 is provided with at least two blades 4222 which are arranged at intervals along the circumferential direction and extend along the axial direction, and a vertical flow passage 4223 is formed between every two adjacent blades 4222. Specifically, the top surface of the middle shaft 4221 has a flow guiding surface 4220 which gradually expands outwards from bottom to top, each vane 4222 comprises an upper section 4226 which is arranged on the upper wall surface of the flow guiding surface 4220 and extends upwards and a lower section 4227 which is arranged on the lower wall surface of the flow guiding surface 4220 and corresponds to the upper section 4226 and extends downwards, a notch 422a which is opened outwards, is in a V shape and is penetrated up and down is arranged between two adjacent upper sections of the flow guiding surface 4220, so that axial flow passages 4223 are formed between two adjacent blades 4222, the upper segment 4226 and the lower segment 4227 form a first part 4224 of the blade 4222, the outer edge of the first part 4224 integrally extends outwards to form a second part 4225 of the blade 4222, the second portion 4225 is vertically disposed and at an angle to the first portion 4224, and the second portion 4225 of each vane 4222 is curved in the same direction, such that all of the vanes 4222 are arranged in a clockwise or counterclockwise rotational direction as a whole. The inner side surface of the lower section 4227 is partially an arc-shaped surface 4228 which is gradually bent outwards from top to bottom, the lower surface of the second portion 4225 is an upper concave surface 4229 which is concave upwards and is connected with the outer part of the arc-shaped surface 4228, and the vertical projection of the joint of the upper concave surface 4229 and the arc-shaped surface 4228 is positioned in the first portion 4224. Therefore, the second impeller does work on the fluid.

As shown in fig. 2 to 5, the cover 5 covers the outlet 312 of the spray arm 3, and the cover 5 includes a top plate 51, a water passage 511 is opened on the top plate 51, an extension section 52 is formed by extending the periphery of the water passage 511 upwards, an outlet end of the extension section 52 is a water outlet 5b, a ring wall 53 is formed by extending the periphery of the top plate 51 downwards, an internal flow passage of the cover 5 is a water outlet passage 5a, a transverse plate 7 is disposed in an inner cavity of the cover 5 and arranged side by side with the top plate 51, the transverse plate 7 is disposed under the top plate 51 with a space therebetween, and a pressure chamber 51a is formed by enclosing the transverse plate 7, the top plate 51 and the inner wall surface of the ring wall 53, specifically, a flow guide passage 721 communicating the pressure chamber 51a with the water inlet 311 is disposed at a position of the transverse plate 7 adjacent to the periphery, so as to communicate the pressure chamber 51a with the water collection chamber 31. Along the fluid flow path, a pressure chamber 51a is located downstream of the water collecting chamber 31, the pressure chamber 51a is communicated with the water outlet 5b, and the pressure chamber 51a is used for pressurizing water to enable the water to be rapidly sprayed out from the water outlet 5b to form a water column A, and the volume of the pressure chamber 51a is smaller than that of the water collecting chamber 31 of the spray arm 3.

In order to move water flowing along the radial direction of the central axis of the second impeller to the axial direction, the lower surface of the transverse plate 7 is provided with a plurality of first flow guide strips 71, the inner edges of the first flow guide strips 71 are all located on the same circumference 711, a first flow channel 72 is formed between every two adjacent first flow guide strips 71, the water outlet section of each first flow channel 72 is a flow guide channel 721, and the first flow guide strips 71 are spirally arranged along the same direction and are circumferentially arranged at intervals, so that all the first flow guide strips 71 are arranged in the clockwise or counterclockwise direction on the whole. In addition, a plurality of second guide strips 73 are arranged on the upper surface of the transverse plate 7, the inner ends of the second guide strips 73 are positioned on the same inner circumference 731, and the outer ends of the second guide strips 73 are positioned on the same outer circumference 732; a second flow channel 74 is formed between two adjacent second flow guide strips 73, along the fluid flow path, the second flow channel 74 is located at the downstream of the flow guide channel 721, and each second flow guide strip 73 is spirally arranged along the same direction at intervals, so that all the second flow guide strips 73 are arranged in a clockwise or counterclockwise rotation direction on the whole.

As shown in fig. 2, the centrifugal impeller 6 is rotatably disposed on the surface of the door body 2 facing the washing chamber 11, the rotation axis of the centrifugal impeller 6 is substantially perpendicular to the door body 2, the rotation axis of the centrifugal impeller 6 extends vertically in a state where the door body 2 is in a state of closing the opening 111, and the centrifugal impeller 6 faces the water outlet 5b and can rotate around its own axis under the action of water flow ejected upward through the water outlet 5 b.

As shown in fig. 7, the centrifugal impeller 6 includes a wheel disc 61 arranged side by side with the door body 2, a position of the wheel disc 61 near the center is disposed on the door body 2 through a mounting shaft 62, and the wheel disc 61 rotates relative to the mounting shaft 62, a number of guide vanes 611 is disposed on a lower wall surface of the wheel disc 61 at a periphery of the mounting shaft 62, the number of the guide vanes 611 is at least three, a water guide channel 612 is formed between two adjacent guide vanes 611, in this embodiment, the number of the guide vanes 611 is 6, and the center of the wheel disc 61 is arranged in a radial shape, and each guide vane 611 is arranged in a spiral shape and at intervals along the same direction, so that all the guide vanes 611 are arranged in a clockwise or counterclockwise rotation direction as a whole. In this embodiment, the guide vane 611 has a suction surface 6111 and a pressure surface 6112, and the suction surface 6111 and the pressure surface 6112 of the guide vane 611 have different pressures, so that the guide vane 611 can always rotate under the jetting action of the water column jetted from the water outlet. The through opening 614 is arranged at the position of the wheel disc 61 corresponding to the two water guide channels 612, so that water upwards sprayed out of the water outlet impacts the door body 2 through the through opening 614, and after impacting, the door body 2 can fall downwards and then flow downwards through the through opening 614, the centrifugal impeller can be cleaned, and the collection of vegetables on the centrifugal impeller 6 is reduced.

In order to block the water flowing out of the water guide channel, the outer end of the water guide channel 612 is an outlet end, the wheel disc 61 is provided with a blocking rib 613 extending along the circumferential direction at the outlet end of at least one water guide channel 612, the bottom surface of the blocking rib 613 is located above the bottom surface of the guide vane 611, and the inner side surface of the blocking rib 613 is an inclined surface 6131 inclined outward gradually from top to bottom. In this way, the water flow is sprayed downwards at a certain inclination angle after passing through the inclined surface, and the spraying is more uniform during the rotation.

In order to realize the installation of the centrifugal impeller 6 and the door body 2, the mounting shaft 62 is arranged at the central position of the centrifugal impeller 6, and at least two convex parts 621 which are arranged at intervals along the circumferential direction are formed by extending the top end of the mounting shaft 62 laterally, specifically, four convex parts 621 are arranged at intervals along the circumferential direction; the door body 2 is provided with the mounting hole 21 that supplies the installation axle 62 to upwards wear out, the week of mounting hole 21 is along offering the confession and corresponding the protruding part 621 to upwards wear out through mouthful 22, it also has four to run through mouthful 22 promptly, the upper surface of the door body 2 has the undercut on the rotation route that is located the protruding part 621 for correspond the spacing groove 23 that the protruding part 621 holding is wherein, spacing groove 23 has four, all be provided with an foretell through mouthful 22 between two adjacent spacing grooves 23, so, installation axle 62 local energy is spacing in mounting hole 21 with rotating. The door body 2 is provided with a cover body 24 at a position located above the projection 621 in a detachable manner, and the inner top surface of the cover body 24 abuts against the top surface of the projection 621 in a state where the projection 621 is located in the corresponding stopper groove 23. So realize to the rotation of installation axle 62 spacing, then install centrifugal impeller on the door body 2. In addition, the detachable installation mode of the cover body 24 and the door body is various, a mode of screw fixing connection can be adopted, and a form of clamping can also be adopted, in this embodiment, the clamping-in portions arranged along the circumferential direction at intervals on the inner peripheral wall of the cover body 24 correspondingly, the door body 2 is provided with a recessed portion for the clamping-in portions to be clamped, and the cover body 24 is installed on the door body 2 through the clamping-in portions and the clamping-in cooperation corresponding to the recessed portions.

The working process of the cleaning machine is as follows:

water in the washing cavity 11 is pumped into the water collecting cavity 31 of the spray arm 3 under the driving of the power assembly, the spray arm 3 basically rotates relative to the box body 1 under the action of water flow, the water flow is sprayed upwards through the spray holes 313, meanwhile, the water flow flows upwards under the flow guiding action of the axial channel 4221 of the second impeller 422, then the water flow which is dispersed in the radial direction moves along the axial direction under the flow guiding action of the first flow channel 72 and the second flow channel 74 on the transverse plate 7, then the water flow enters the pressure cavity 51a to be pressurized and then is sprayed upwards through the water outlet 5b, the sprayed water column sprays the centrifugal impeller 6, so that the centrifugal impeller 6 rotates around the axis of the centrifugal impeller, the water flow flows out through the water guide channel 61 to splash to the periphery and flow downwards to wash tableware, fruits and vegetables and the like, pollutants of objects to be washed can be effectively removed, the washing is cleaner, and the washing effect is better.

Example two:

fig. 12 to 17 show a second preferred embodiment of the present invention.

This embodiment differs from the first embodiment described above in that: as shown in fig. 12 and 15, the cross plate 7 and the cover 5 are an integral piece, and the cross plate 7 is not provided with the first flow passage and the second flow passage. In addition, a flow guide ring 8 is arranged in the inner cavity of the cover 51, the flow guide ring 8 is vertically arranged between the transverse plate 7 and the upper wall plate 3a of the spray arm 3, is annular and is positioned at the periphery of the second impeller 422 of the power assembly 4, and a flow guide opening 7a communicated with the flow guide channel 721 is arranged between the flow guide ring 8 and the transverse plate 7. The upper periphery of the deflector ring 8 is provided with a V-shaped notch 81 with an upward opening, the V-shaped notch 81 comprises a vertical edge 811 and a slant edge 812 connected with the bottom end of the vertical edge 811, and an included angle α between the slant edge 812 and the horizontal plane is 50 degrees. The V-shaped notches 81 are 6 and are arranged at intervals along the circumferential direction, and the transverse plate 7 and the guide ring 8 enclose between the positions corresponding to the V-shaped notches 81 to form a guide opening 7 a.

The working process of the cleaning machine is as follows:

water in the washing cavity 11 is pumped into the water collecting cavity 31 of the spray arm 3 under the driving of the power assembly, the spray arm 3 basically rotates relative to the box body 1 under the action of water flow, the water flow is sprayed upwards through the spray holes 313, meanwhile, the water flow flows upwards under the flow guiding action of the axial channel 4221 of the second impeller 422, then the water flow radially dispersed moves along the axial direction after passing through the V-shaped notch 81 of the flow guiding ring 8 and the flow guiding channel 721 on the transverse plate 7 and enters the pressure cavity 51a for pressurization and then is sprayed upwards through the water outlet 5b, and the sprayed water column sprays the centrifugal impeller 6, so that the centrifugal impeller 6 rotates around the axis of the centrifugal impeller, the water flow flows out through the water guiding channel 61 and splashes around and flows downwards to wash tableware, fruits and vegetables and the like, pollutants of objects to be washed can be effectively removed, the washing is cleaner, and the washing effect is better.

Claims

1. A cleaning machine comprises

A cabinet (1) having a washing chamber (11) which is hollow inside and open at the top (111);

a door body (2) covering the top opening of the washing chamber (11) for opening or closing the opening (111);

the spraying arm (3) is internally hollow to form a water collecting cavity (31), a water inlet (311) communicated with the water collecting cavity (31) is formed in the spraying arm (3), and a plurality of spraying holes (313) which are arranged at intervals along the length direction of the spraying arm are formed in an upper wall plate (3a) of the spraying arm;

the power assembly (4) is arranged at a water inlet (311) of the spray arm (3) and is used for pumping water into the water collecting cavity (31) through the water inlet (311) at a high speed;

it is characterized in that an outlet (312) is arranged on the position of the upper wall plate (3a) of the spray arm (3) close to the center, a cover cap (5) covers the outlet (312) of the spray arm (3), and the spray arm further comprises:

a water outlet channel (5a) which is an internal flow passage of the cover (5) and internally provided with a pressure chamber (51a) for pressurizing water, wherein the pressure chamber (51a) is communicated with the water collecting chamber (31), the pressure chamber (51a) is positioned at the downstream of the water collecting chamber (31) along a fluid flow path, and the water outlet channel (5a) is provided with a water outlet (5b) which is opened upwards and is communicated with the pressure chamber (51 a);

centrifugal impeller (6), set up on door body (2) surface towards washing chamber (11), and towards delivery port (5b), and can rotate around self axis under delivery port (5b) upwards spun rivers effect, and including rim plate (61), be provided with guide vane (611) on the lower wall of rim plate (61), guide vane (611) have at least three, be formed with water guide channel (612) between two adjacent guide vane (611), opening (614) have been seted up in rim plate (61) on the position that corresponds two water guide channel (612).

2. The cleaning machine of claim 1, wherein: the cover comprises a top plate (51), a water through opening (511) is formed in the top plate (51), an extension section (52) is formed by upward extension of the periphery of the water through opening (511), the outlet end of the extension section (52) is the water outlet (5b), and a circular wall (53) is formed by downward extension of the periphery of the top plate (51).

3. The cleaning machine of claim 2, wherein: a transverse plate (7) which is arranged side by side with the top plate (51) and is positioned below the top plate (51) is arranged in an inner cavity of the cover cap (5), a pressure cavity (51a) is formed by enclosing the transverse plate (7), the top plate (51) and the inner wall surface of the annular wall (53), and a flow guide channel (721) which is communicated with the pressure cavity (51a) and the water inlet (311) is arranged on the position, adjacent to the outer peripheral edge, of the transverse plate (7).

4. The cleaning machine of claim 3, wherein: the lower surface of the transverse plate (7) is provided with a plurality of first flow guide strips (71), a first flow channel (72) is formed between every two adjacent first flow guide strips (71), the water outlet section of each first flow channel (72) is a flow guide channel (721), and each first flow guide strip (71) is spirally arranged along the same direction and is circumferentially arranged at intervals, so that all first flow guide strips (71) are integrally arranged in a clockwise or anticlockwise rotating direction.

5. The cleaning machine of claim 4, wherein: the inner edges of the first flow guide strips (71) are all located on the same circumference.

6. The cleaning machine of claim 3, wherein: the upper surface of the transverse plate (7) is provided with a plurality of second flow guide strips (73), a second flow passage (74) is formed between every two adjacent second flow guide strips (73), along a fluid flow path, the second flow passage (74) is located at the downstream of the flow guide channel (721), and the second flow guide strips (73) are spirally arranged along the same direction at intervals, so that all the second flow guide strips (73) are spirally arranged in a clockwise or anticlockwise rotating direction on the whole.

7. The cleaning machine of claim 3, wherein: be provided with water conservancy diversion ring (8) in the inner chamber of shroud (5), water conservancy diversion ring (8) are vertical to be set up between diaphragm (7) and the last wallboard (3a) of spray arm (3), and be cyclic annular to be located the periphery of power component (4), water conservancy diversion ring (8) with have between diaphragm (7) with water conservancy diversion mouth (7a) that water conservancy diversion passageway (721) is linked together.

8. The cleaning machine of claim 7, wherein: v-arrangement breach (81) that open side up have been seted up on the last week edge of water conservancy diversion ring (8), V-arrangement breach (81) have a plurality ofly and arrange along circumference interval, diaphragm (7) and water conservancy diversion ring (8) enclose to close between the position that corresponds V-arrangement breach (81) and be formed with water conservancy diversion mouth (7 a).

9. The cleaning machine of any one of claims 1 to 8, wherein: the water inlet (311) is formed in the position, close to the center, of the bottom of the spraying arm (3), the power assembly (4) comprises a motor (41) and an impeller assembly (42), the motor (41) is located below the water inlet (311) and is provided with an output shaft extending upwards, and at least part of the impeller assembly (42) is located in the water collecting cavity (31) and is installed at the upper end of the output shaft of the motor (41).

10. The cleaning machine of claim 9, wherein: the impeller assembly (42) comprises a first impeller (421) and a second impeller (422) which are coaxially arranged, the first impeller (421) is provided with a spiral flow passage (4211) which extends upwards in a spiral mode and is used for drawing fluid upwards, the second impeller (422) is located at the downstream of the first impeller (421) along a fluid flow path, the second impeller (422) is provided with at least two vertical flow passages (4223) which are arranged at intervals in the circumferential direction and extend upwards, and the vertical flow passages (4223) are communicated with the spiral flow passage (4211).

11. The cleaning machine of claim 10, wherein: the second impeller (422) comprises a middle shaft (4221), a shaft hole for the output shaft of the motor (41) to penetrate and fix is formed in the middle shaft (4221), at least two blades (4222) which are arranged at intervals along the circumferential direction and extend along the axial direction are arranged on the circumferential surface of the middle shaft (4221), and the vertical flow passage (4223) is formed between every two adjacent blades (4222).

12. The cleaning machine of claim 1, wherein: the spray arm (3) is horizontally and rotatably arranged in the washing cavity (11) at a position close to the bottom.