CN220494981U

CN220494981U - Nozzle and spray arm for cleaning machine and cleaning machine

Info

Publication number: CN220494981U
Application number: CN202320969888.4U
Authority: CN
Inventors: 陆泽杰
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2023-04-24
Filing date: 2023-04-24
Publication date: 2024-02-20
Anticipated expiration: 2033-04-24

Abstract

The utility model relates to a nozzle for a cleaning machine, a spray arm and the cleaning machine, wherein a flow channel is formed in the interior of the nozzle in a hollow mode, a water inlet is formed in the bottom wall of the nozzle, a water spray hole is formed in the top wall of the nozzle, at least two water spray holes are obliquely arranged near the edge of the nozzle, and a vertically extending spray hole is further formed in the central part of the top wall of the nozzle. According to the utility model, the vertically extending jet orifice is arranged at the central part of the top wall of the nozzle, water enters the nozzle through the water inlet and is directly and vertically jetted out through the jet orifice, when the nozzle rotates faster, the water column jetted out through the jet orifice can keep a larger lift without being influenced by the rotating speed of the nozzle, and meanwhile, part of water can balance the impact force of the water flow on the nozzle to a certain extent after being jetted out through the jet orifice, so that the nozzle keeps a proper rotating speed, the aim of considering the rotating speed of the nozzle and the jet lift is fulfilled, and the cleaning effect is improved.

Description

Nozzle and spray arm for cleaning machine and cleaning machine

Technical Field

The utility model relates to the technical field of dish washing machines, in particular to a nozzle, a spray arm and a cleaning machine for cleaning tableware, fruits and vegetables.

Background

A dishwasher is generally provided with a shower arm for washing tableware or fruits and vegetables by spraying a water column.

The applicant's prior patent ZL 202221708811.3, "spray arm for a washer and washer", discloses a structure in which the spray arm includes a body having a water outlet near the end on the top wall thereof, and a nozzle rotatably connected to the water outlet, the nozzle being disc-shaped and having a spray opening at the top thereof, the spray opening being arranged obliquely. When the spray arm rotates, the spray nozzle rotates along with the spray arm and rotates at the same time, and the water column sprayed by the spray nozzle is matched with the water column sprayed by the water spraying hole, so that the spray nozzle is beneficial to diffusing the cleaning range and eliminating the cleaning dead angle, and the cleaning effect is improved.

However, the applicant found that, because the rotation of the nozzle is driven by the viscous force of water flow, the rotation speed of the nozzle is not stable under the influence of the process, the strength of the head of the water jet on the nozzle is limited by the rotation speed of the nozzle, and the slower the nozzle rotates, the larger the head, the faster the nozzle rotates and the smaller the head. This results in a nozzle with a jet having a head that is difficult to meet when the nozzle is rotated relatively quickly, thereby affecting the cleaning effect of the jet.

Disclosure of Invention

The first technical problem to be solved by the utility model is to provide a nozzle for a cleaning machine, which can maintain high jet lift under the condition of high rotating speed of the nozzle so as to improve the cleaning effect.

The second technical problem to be solved by the present utility model is to provide a spray arm with the nozzle, aiming at the current state of the art.

The third technical problem to be solved by the utility model is to provide a cleaning machine with the spray arm aiming at the current state of the art.

The utility model solves at least one of the technical problems by adopting the following technical proposal:

a nozzle for a cleaning machine is hollow in the interior to form a flow channel, a water inlet is formed in the bottom wall of the nozzle, a water outlet is formed in the top wall of the nozzle, at least two water outlets are obliquely arranged near the edge of the nozzle, and a vertically extending jet orifice is further arranged in the central position of the top wall of the nozzle.

Preferably, the jet ports are arranged corresponding to the water inlet ports, and the inclination of the axial lead of the jet ports relative to the vertical plane is a < 5 °. More preferably 0.ltoreq.a.ltoreq.3°. The jet orifice structure is adopted to reduce the deflection of the water column jetted from the jet orifice and reduce the influence on the rotation of the jet orifice.

Preferably, the projection of the injection port in the horizontal plane is located within the projection of the water inlet in the horizontal plane. By adopting the structure, water can be vertically and upwards sprayed out through the jet orifice when entering the nozzle flow channel through the water inlet, so that the jet water column is always kept high in lift without being influenced by the rotating speed of the nozzle, and the cleanliness is improved.

Preferably, the sum of the areas of the injection port and each water injection port is less than or equal to the area of the water inlet. By adopting the structure, the water jet and the jet opening can have enough water flow, and the cleanliness is improved.

Preferably, the aperture of the water jet is smaller than the aperture of the jet. Further preferably, the diameter of the water jet is 2 to 2.6mm, and the diameter of the jet orifice is 2.7 to 3.5mm. Still further, the diameter of the water jet was 2.5mm, and the diameter of the jet was 3mm. The jet orifice is a lift protection orifice, so that the lift of the nozzle can be better protected by adopting the parameter setting, and the influence on the flow and the lift of the water jet orifice is reduced.

Preferably, the number of the water spraying holes is at least 2, and each water spraying hole is arranged on the top wall of the nozzle at intervals along a circumferential direction and used for spraying water columns capable of driving the nozzle to rotate along a first direction. The structure can drive the nozzle to rotate by utilizing the reaction force of the water jet to jet water column.

Preferably, the water spraying port comprises a first nozzle and a second nozzle which are symmetrically arranged on the circumference, and the inclination directions of the first nozzle and the second nozzle are opposite. An acute angle b1 formed between the axis of the first nozzle and/or the axis of the second nozzle and the horizontal plane is 75-85 degrees. Further preferably b1=78 to 82 °. The first nozzle and the second nozzle can be matched with tableware to be placed in the bowl basket, and the bowl basket is cleaned according to the mug and the dinner plate area respectively, so that the cleaning effect of the local area is improved.

Preferably, the water spraying port comprises a third nozzle arranged between the first nozzle and the second nozzle, and an acute angle b2 formed between the axis of the third nozzle and the horizontal plane is 25-45 degrees. Further preferably b2=32 to 37 °. The third nozzle has a larger inclination angle, and can clean the four corners of the bowl basket and the washing cavity, so that the cleaning coverage surface is increased, and the cleaning dead angle is eliminated.

Preferably, the water jet further comprises a fourth nozzle symmetrically arranged with the third nozzle on the circumference, and the inclination direction of the fourth nozzle is the same as that of the third nozzle. The fourth nozzle is symmetrically arranged with the third nozzle and has the same inclination direction, so that the reaction force of the water column sprayed by the fourth nozzle to the nozzle is opposite to the rotation direction of the nozzle, thereby playing a role of decelerating the nozzle and controlling the rotation speed of the nozzle by being matched with other water spray ports.

Preferably, an acute angle b3, b3 > b2 is formed between the axis of the fourth nozzle and the horizontal plane. b3 =55 to 70 °. Further preferably b3=62 to 67 °. By setting the inclination angle, the tableware can be matched with the placing direction of the tableware on the bowl basket, and the tableware can be cleaned aiming at rice bowls and noodle bowls with larger depth.

Preferably, the nozzle further comprises at least one water jet for jetting water columns capable of driving the nozzle to rotate along a second direction, the water jet is arranged on the top wall of the nozzle along with other water jets at intervals along the circumferential direction, the second direction is opposite to the first direction, and the water jet, namely the fourth water jet, is used for being matched with the other water jets together to control the rotating speed of the nozzle.

Preferably, the nozzle is disc-shaped, the flow passage comprises a water collecting part surrounding the water inlet and a secondary flow passage extending from the edge of the water collecting part to the edge of the nozzle, and the water spraying port is arranged corresponding to the end part of the secondary flow passage. The structure can guide the water to be discharged, reduce the energy loss of water flow and improve the lift.

Preferably, the top of the nozzle is provided with a top cover, the top cover is provided with an injection hole corresponding to the water jet, a gap for air to be sucked into the jet water column in a jet state is formed between the injection hole and the water jet, and the injection hole and the gap together form an air-entrapping structure for enabling the injection hole to inject cavitation water column. According to venturi effect, when the water column passes through the water jet and the jet hole, negative pressure is generated at the gap to suck the air around the water column into the water column, so that cavitation water column with bubbles is formed, when the cavitation water column is hit on the surface of the object to be cleaned, the stripping force to pollutants can be increased instantaneously due to the breaking of the bubbles, and the cleaning effect is improved.

Preferably, a surrounding edge is arranged between the top cover edge and the top wall edge of the nozzle, the surrounding edge, the lower surface of the top cover and the upper surface of the nozzle jointly enclose an air collecting cavity which surrounds the water jet and the jet hole, and an air inlet for communicating outside air with the air collecting cavity is formed in the surrounding edge. By adopting the structure, a relatively closed gas collecting cavity is formed, so that food residues, sediment and the like are prevented from invading.

Further preferably, the bottom outer edge of the air inlet gradually slopes downwards from inside to outside to form a diversion slope. The structure is convenient for guiding the water flow contacting the air inlet outwards, avoiding the water inlet of the air collecting cavity and discharging the water in time after a small amount of water is fed.

The utility model provides a spray arm, inside cavity forms along the fluid passageway that length direction extends, open on the spray arm have the hole for water spraying that is linked together with the fluid passageway, still include the nozzle on, open on the roof of spray arm and be close to the delivery port that the tip was arranged, the water inlet department of nozzle sets up the water inlet cover that extends downwards and rotationally inserts in the delivery port, and the bottom edge of this water inlet cover is provided with can offset with the fluid passageway inner roof thereby retrain the card foot on the spray arm with it. By adopting the structure, the spray nozzle which can rotate along with the spray arm and simultaneously rotate relative to the spray arm is arranged at the end part of the spray arm with weak water pressure of the spray water column, so that the cleaning area is diffused, the cleaning dead angle is eliminated, and the cleaning effect is improved.

The utility model provides a cleaning machine, includes the box, the bottom half is provided with the backwater region of indent, and the top in this backwater region is covered with the filter, still includes above-mentioned spray arm, and this spray arm can locate rotationally on the filter its through pump water mechanism with backwater region be linked together.

Compared with the prior art, the utility model has the advantages that: according to the utility model, the vertically extending jet orifice is arranged at the central part of the top wall of the nozzle, water enters the nozzle through the water inlet and is directly and vertically jetted out through the jet orifice, when the nozzle rotates faster, the water column jetted out through the jet orifice can keep a larger lift without being influenced by the rotating speed of the nozzle, and meanwhile, part of water can balance the impact force of the water flow on the nozzle to a certain extent after being jetted out through the jet orifice, so that the nozzle keeps a proper rotating speed, the aim of considering the rotating speed of the nozzle and the jet lift is fulfilled, and the cleaning effect is improved.

Drawings

FIG. 1 is a schematic view of a nozzle according to an embodiment of the present utility model;

FIG. 2 is a schematic view of the hidden roof of FIG. 1;

FIG. 3 is a schematic view of the structure of the lower part of the nozzle according to the embodiment of the present utility model;

FIG. 4 is a cross-sectional view of FIG. 1;

FIG. 5 is a schematic view illustrating the inclination angles of the first nozzle and the second nozzle according to an embodiment of the present utility model;

FIG. 6 is a schematic view illustrating an inclination angle of a third nozzle according to an embodiment of the present utility model;

FIG. 7 is a schematic view illustrating an inclination angle of a fourth nozzle according to an embodiment of the present utility model;

FIG. 8 is a schematic view of a spray arm configuration in accordance with an embodiment of the present utility model;

fig. 9 is a partial cross-sectional view of fig. 8.

Detailed Description

The utility model is described in further detail below with reference to the embodiments of the drawings.

As shown in fig. 1 to 7, the nozzle 2 for a cleaning machine according to this embodiment is disc-shaped, a flow passage 21 is formed in the interior of the nozzle 2, a water inlet 22 is formed in the bottom wall of the nozzle 2, water spouts 23 are formed in the top wall of the nozzle 2, and four water spouts 23 are arranged on the top wall of the nozzle 2 in an inclined manner near the edge of the nozzle.

The center portion of the nozzle top wall of the present embodiment is also provided with a vertically extending injection port 24. The injection port 24 is arranged corresponding to the water inlet 22, and the inclination of the axis of the injection port 24 with respect to the vertical plane is a.ltoreq.5°, preferably 0.ltoreq.a.ltoreq.3°, with a=0° being the most preferred embodiment. The projection of the injection port 24 in the horizontal plane is located within the projection of the water inlet 22 in the horizontal plane. The water enters the nozzle through the water inlet 22 and is directly vertically sprayed out through the spray opening 24, and when the nozzle rotates faster, the water column sprayed out through the spray opening 24 can keep larger lift without being influenced by the rotating speed of the nozzle.

The sum of the areas of the injection ports 24 and the water injection ports 23 is smaller than or equal to the area of the water inlet port 22. With this structure, the water jet ports 23 and 24 can be maintained at a sufficient water flow rate, and the cleanliness can be improved.

The aperture of the water jet 23 is smaller than the aperture of the jet opening 24. The diameter of the water jet 23 is 2-2.6 mm, and the diameter of the jet opening 24 is 2.7-3.5 mm. In this embodiment, the diameter of the water jet 23 is 2.5mm and the diameter of the jet opening 24 is 3mm. Because the jet orifice 24 of this embodiment is a head protection orifice, the above parameter settings are adopted, so that the nozzle head can be better protected, and the influence on the flow and the head of the water jet orifice 23 can be reduced.

The water jets 23 of this embodiment are circumferentially spaced on the top wall of the nozzle and are configured to eject water columns that are capable of driving the nozzle to rotate in a first direction, and the structure is such that the nozzle is driven to rotate by the reaction force of the water columns ejected by the water jets 23. Specifically, the water jet 23 includes a first nozzle 231 and a second nozzle 232 symmetrically arranged on the circumference, and the inclination directions of the first nozzle 231 and the second nozzle 232 are opposite. The acute angle b1 formed between the axes of the first nozzle 231 and the second nozzle 232 and the horizontal plane is 75 to 85 °, and preferably b1=78 to 82 °. The first nozzle 231 and the second nozzle 232 may be matched with the direction of placing the tableware on the bowl basket, and the tableware is cleaned respectively for the mug and the dinner plate area, so as to improve the cleaning effect of the local area.

The water jet 23 further comprises a third nozzle 233 located between the first nozzle 231 and the second nozzle 232, wherein an acute angle b2 formed between the axis of the third nozzle 233 and the horizontal plane is 25-45 °, preferably b2=32-37 °. The third nozzle 233 has a larger inclination angle, and can clean the four corners of the bowl basket and the washing cavity, so as to increase the cleaning coverage and eliminate the cleaning dead angle.

The water jet 23 further comprises a fourth nozzle 234 arranged symmetrically to the third nozzle 233 in the circumferential direction, and the fourth nozzle 234 is inclined in the same direction as the third nozzle 233. Since the fourth nozzle 234 is symmetrically arranged with respect to the third nozzle 233 and has the same inclination direction, the reaction force of the water jet injected from the fourth nozzle 234 to the nozzle is opposite to the rotation direction of the nozzle, thereby decelerating the nozzle to cooperate with other water jets to control the rotation speed of the nozzle.

The acute angle formed between the axis of the fourth nozzle 234 and the horizontal plane is b3, and b3 > b2. b3 =55 to 70 °, preferably b3=62 to 67 °. By setting the inclination angle, the tableware can be matched with the placing direction of the tableware on the bowl basket, and the tableware can be cleaned aiming at rice bowls and noodle bowls with larger depth.

The nozzle of this embodiment includes at least one water jet for jetting water columns capable of driving the nozzle to rotate along a second direction, wherein the water jet is arranged on the top wall of the nozzle along with other water jets at intervals along the circumferential direction, the second direction is opposite to the first direction, and the water jet, namely the fourth water jet 234, is used for being matched with the other water jets together to control the rotating speed of the nozzle.

The flow passage 21 of the present embodiment includes a water collecting portion 211 enclosing the water inlet 22 therein and a sub-flow passage 212 extending from the edge of the water collecting portion 211 toward the edge of the nozzle, and each water jet 23 is arranged corresponding to an end of the sub-flow passage 212. The structure can guide the water to be discharged, reduce the energy loss of water flow and improve the lift.

In this embodiment, a top cover 25 is disposed on top of the nozzle 2, and spray holes 251 corresponding to the water spray openings 23 and 24 are formed on the top cover 25, and a gap 26 for sucking air into the jet water column in the jet state is formed between the spray holes 251 and the water spray openings 23, and the spray holes 251 and the gap 26 together form an air-entraining structure for enabling the spray holes 251 to spray cavitation water column. According to venturi effect, when the water column passes through the water jet and the jet hole, negative pressure is generated at the gap to suck the air around the water column into the water column, so that cavitation water column with bubbles is formed, when the cavitation water column is hit on the surface of the object to be cleaned, the stripping force to pollutants can be increased instantaneously due to the breaking of the bubbles, and the cleaning effect is improved.

A surrounding edge 27 is arranged between the edge of the top cover 25 and the edge of the top wall of the nozzle 2, the surrounding edge 27, the lower surface of the top cover 25 and the upper surface of the nozzle 2 jointly enclose an air collection cavity 250 which surrounds the water spray openings 23 and the spray holes 251, and an air inlet 271 for communicating outside air with the air collection cavity 250 is arranged on the surrounding edge 27. With the above structure, the relatively closed gas collecting chamber 250 is formed to prevent invasion of food waste, silt and the like.

The bottom outer edge of the air inlet 271 gradually slopes downward from inside to outside to form a diversion slope 272. This structure facilitates outward guiding of water flow contacting the air inlet 271, avoids water from the air collecting chamber 250 and discharges water in time after a small amount of water is introduced.

As shown in fig. 7 and 8, the spray arm 1 of the present embodiment is hollow and forms a fluid channel 11 extending along the length direction, the spray arm 2 is provided with a water spraying hole 12 communicating with the fluid channel 11, the spray arm further comprises an upper nozzle 2, the top wall of the spray arm 1 is provided with water outlets 13 near two ends respectively, a water inlet 22 of the nozzle 2 is provided with a water inlet sleeve 221 extending downwards and rotatably inserted in the water outlets 13, and the bottom edge of the water inlet sleeve 221 is provided with a clamping foot 222 capable of propping against the inner top wall of the fluid channel 11 to restrain the water inlet sleeve on the spray arm 1. By adopting the structure, the spray nozzle which can rotate along with the spray arm and simultaneously rotate relative to the spray arm is arranged at the end part of the spray arm with weak water pressure of the spray water column, so that the cleaning area is diffused, the cleaning dead angle is eliminated, and the cleaning effect is improved.

The top of the spray arm 1 of the embodiment is also provided with an air-entrapping structure identical to the air-entrapping structure of the nozzle 2, so as to further improve the cleaning effect.

The cleaning machine of this embodiment includes the box (not shown in the figure), and the bottom of the box is provided with the backwater region of indent, and the top in this backwater region is covered with the filter, still includes above-mentioned spray arm 1, and this spray arm 1 can locate on the filter rotationally and be linked together with the backwater region through pump water mechanism.

In this embodiment, the vertically extending injection port 24 is disposed at the center of the top wall of the nozzle 2, water enters the nozzle 2 through the water inlet 22 and is directly injected vertically through the injection port 24, when the nozzle 2 rotates faster, the water column injected through the injection port 24 is not influenced by the rotation speed of the nozzle 2 and can maintain a larger lift, although the water column injected through the injection port 24 theoretically has a parabolic shape along with the rotation of the nozzle 2, in actual cleaning, the water column injected through the injection port 24 basically maintains a vertical state in the height direction of the whole washing chamber, and as the nozzle 2 rotates, the water column draws a cylindrical track along the inner edge of the washing chamber; part of water is sprayed through the spray orifice 24 and then can balance the impact force of the water flow on the spray nozzle to a certain extent, so that the spray nozzle 2 can keep proper rotation speed, the purposes of considering the rotation speed of the spray nozzle 2 and the jet head are achieved, and the cleaning effect is improved.

In the description and claims of the present utility model, terms indicating directions, such as "front", "rear", "upper", "lower", "left", "right", "side", "top", "bottom", etc., are used to describe various example structural parts and elements of the present utility model, but these terms are used herein for convenience of description only and are determined based on the example orientations shown in the drawings. Because the disclosed embodiments of the utility model may be arranged in a variety of orientations, the directional terminology is used for purposes of illustration and is in no way limiting, such as "upper" and "lower" are not necessarily limited to being in a direction opposite or coincident with the direction of gravity.

Claims

1. A nozzle for a cleaning machine, comprising a bottom wall, a top wall and a flow passage (21) defined by the bottom wall and the top wall, which are arranged oppositely, wherein the bottom wall of the nozzle is provided with a water inlet (22), and the nozzle is characterized in that: the top wall is provided with a vertically extending jet opening (24) at a central portion thereof, and at least two obliquely arranged water jet openings (23) at an edge portion thereof.

2. A nozzle for a washer according to claim 1, wherein: the jet ports (24) are arranged corresponding to the water inlets (22), and the inclination of the axial lead of the jet ports (24) relative to the vertical plane is a less than or equal to 5 degrees.

3. A nozzle for a washer according to claim 2, wherein: a is more than or equal to 0 and less than or equal to 3 degrees.

4. A nozzle for a washer according to claim 2, wherein: the projection of the injection opening (24) in the horizontal plane is located within the projection of the water inlet (22) in the horizontal plane.

5. The nozzle for a cleaning machine according to any one of claims 1 to 4, characterized in that: the sum of the areas of the jet ports (24) and the water jet ports (23) is less than or equal to the area of the water inlet port (22).

6. The nozzle for a cleaning machine according to any one of claims 1 to 4, characterized in that: the aperture of the water jet (23) is smaller than that of the jet orifice (24).

7. The nozzle for a washer of claim 6, wherein: the aperture of the water jet (23) is 2-2.6 mm, and the aperture of the jet orifice (24) is 2.7-3.5 mm.

8. The nozzle for a washer of claim 7, wherein: the aperture of the water jet (23) is 2.5mm, and the aperture of the jet orifice (24) is 3mm.

9. The nozzle for a cleaning machine according to any one of claims 1 to 4, characterized in that: at least two of the water jets (23) are circumferentially spaced on the top wall of the nozzle and are configured to jet water jets capable of driving the nozzle to rotate in a first direction.

10. The nozzle for a washer of claim 9, wherein: the water spraying port (23) comprises a first nozzle (231) and a second nozzle (232) which are symmetrically arranged on the circumference, and the inclination directions of the first nozzle (231) and the second nozzle (232) are opposite.

11. The nozzle for a washer of claim 10, wherein: an acute angle b1 formed between the axis of the first nozzle (231) and/or the second nozzle (232) and the horizontal plane is 75-85 degrees.

12. The nozzle for a washer of claim 11, wherein: b1 =78 to 82 °.

13. The nozzle for a washer of claim 9, wherein: the water spraying opening (23) comprises a third nozzle (233), and an acute angle b2 formed between the axis of the third nozzle (233) and the horizontal plane is 25-45 degrees.

14. The nozzle for a washer of claim 13, wherein: b2 =32 to 37 °.

15. The nozzle for a washer of claim 13, wherein: the water jet (23) further comprises a fourth nozzle (234) symmetrically arranged with the third nozzle (233) on the circumference, and the inclination direction of the fourth nozzle (234) is the same as that of the third nozzle (233).

16. The nozzle for a washer of claim 15, wherein: an acute angle b3 is formed between the axial lead of the fourth nozzle (234) and the horizontal plane, and b3 is more than b2.

17. The nozzle for a washer of claim 16, wherein: b3 =55 to 70 °.

18. The nozzle for a washer of claim 17, wherein: b3 =62 to 67 °.

19. The nozzle for a washer of claim 9, wherein: and at least one water jet (23) for jetting water columns capable of driving the nozzle to rotate along a second direction, wherein the water jet (23) is arranged on the top wall of the nozzle along with other water jets (23) at intervals along the circumferential direction, and the second direction is opposite to the first direction.

20. The nozzle for a cleaning machine according to any one of claims 1 to 4, characterized in that: the nozzle is disc-shaped, the runner (21) comprises a water collecting part (211) surrounding the water inlet (22) and a secondary runner (212) extending from the edge of the water collecting part (211) to the edge of the nozzle, and the water spraying opening (23) is arranged corresponding to the end part of the secondary runner (212).

21. The nozzle for a cleaning machine according to any one of claims 1 to 4, characterized in that: the top of the nozzle is provided with a top cover (25), the top cover (25) is provided with an injection hole (251) which is arranged corresponding to the water jet (23) and/or the injection port (24), a gap (26) which can be used for sucking air into a jet water column in a jet state is formed between the injection hole (251) and the water jet (23), and the injection hole (251) and the gap (26) jointly form an air-entrapping structure which can enable the injection hole (251) to inject the water column carrying bubbles.

22. The nozzle for a washer of claim 21, wherein: a surrounding edge (27) is arranged between the edge of the top cover (25) and the edge of the top wall of the nozzle, the surrounding edge (27) and the lower surface of the top cover (25) and the upper surface of the nozzle jointly enclose an air collection cavity (250) which surrounds the water spray opening (23) and the spray hole (251), and an air inlet (271) which is used for communicating outside air with the air collection cavity (250) is formed in the surrounding edge (27).

23. The nozzle for a washer of claim 22, wherein: the bottom outer edge of the air inlet (271) gradually slopes downwards from inside to outside to form a diversion slope (272).

24. A spray arm, inside cavity forms fluid passageway (11) that extend along length direction, open on the spray arm have with fluid passageway (11) be linked together water jet (12), its characterized in that: the spray nozzle of any one of claims 1 to 23, wherein the spray arm is provided with a water outlet (13) arranged near the end, and the spray nozzle is rotatably arranged at the water outlet (13) and is communicated with the fluid channel (11).

25. The spray arm of claim 24 wherein: the bottom of the nozzle is provided with a water inlet (22), a water inlet sleeve (221) which extends downwards and can be rotatably inserted into the water outlet (13) is arranged at the water inlet (22), and a clamping foot (222) which can be propped against the inner top wall of the fluid channel (11) to restrain the fluid channel on the spray arm is arranged at the bottom edge of the water inlet sleeve (221).

26. The utility model provides a cleaning machine, includes the box, the bottom half is provided with the return water region of indent, and this return water region's top covers has the filter, its characterized in that: the spray arm of claim 24 or 25 rotatably disposed above said filter plate and in communication with the recirculation zone via a pumping mechanism.