CN218684262U

CN218684262U - A spray arm and cleaning machine for cleaning machine

Info

Publication number: CN218684262U
Application number: CN202221703761.XU
Authority: CN
Inventors: 魏本柱; 刁硕; 姚永磊; 潘嘉威; 韩健健
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2023-03-24
Anticipated expiration: 2032-06-30

Abstract

The utility model relates to a spray arm and cleaning machine for cleaning machine, the inside cavity of spray arm forms the runner, and the hole for water spraying that is linked together with the runner is seted up to the first side wall of body water inlet, the second side wall that is linked together with the runner, is provided with in the hole for water spraying can the pivoted nozzle, and it has the spout of following hole for water spraying eccentric arrangement to open on this nozzle, the bottom of nozzle is provided with and is arranged in the spray arm and can drive the rotatory blade of nozzle under the rivers impact, and this blade is two at least and interval arrangement on the periphery wall of nozzle. The utility model discloses set up the blade bottom the nozzle, under the water impact in the spray arm, the blade rotates and drives the nozzle rotation, and the rotary power of nozzle comes from the blade of arranging along its periphery, makes the nozzle atress in week even relatively, is favorable to improving the rotational stability of nozzle to improve the cleanliness factor homogeneity of spraying the within range.

Description

A spray arm and cleaning machine for cleaning machine

Technical Field

The utility model relates to a dish washer technical field specifically indicates a spray arm and cleaning machine for cleaning machine.

Background

A dishwasher is generally provided with a spray arm for spraying water to wash dishes or vegetables. For example, chinese patent publication No. CN204813755U, entitled "spray arm seat of dishwasher", spray arm device of dishwasher and dishwasher "(application No. CN 201520531714.5), and chinese patent publication No. CN209932651U, entitled" spray arm of cleaning machine "(application No. CN201920258610. X) disclose corresponding spray arm structures.

For the spray arm with the structure, the water inlet is positioned on one side wall of the spray arm, and double water outlets are formed from the water inlet to two sides, the spray arm is driven to rotate by viscous force of water dispersed in the flow channel, and the other side wall of the spray arm is provided with the water spraying hole for spraying water columns. In the existing dish washing machine, after the structure of the dish rack is fixed, the positions of dishes on the dish rack are unchanged, and the water columns sprayed by the spraying arms are approximately linear (strip-shaped), so that the range of the sprayed water columns is limited, the surfaces of all tableware cannot be considered, dead angles exist in washing, and the washing effect is influenced. Meanwhile, for the dish washer with a rectangular washing cavity, a washing dead angle is easy to generate.

In order to solve the above problems, the applicant's prior patent, ZL 202121476877, discloses a structure comprising a main body extending along a length direction, a water inlet opening formed on a bottom wall of the main body, a water collecting chamber communicating with the water inlet opening and a flow channel extending from the water collecting chamber to both sides, a water spraying hole communicating with the flow channel formed on a top wall of the main body, a nozzle capable of rotating with the water column spraying out and arranged on at least one water spraying hole, and a nozzle eccentrically arranged along the water spraying hole formed on the nozzle. In the rotation process of the spray arm, the eccentrically arranged nozzle rotates along with the nozzle to spray a conical water column with a small lower end and a large upper end, the coverage surface of the water column per se is greatly improved compared with that of a straight line type water column, and along with the rotation of the spray arm per se, the conical water column can cover a larger cleaning area, so that the cleaning dead angle can be eliminated, and the cleaning effect is improved.

However, the nozzle is directly constrained on the water jet hole, when the water column is sprayed, the power for rotating the nozzle is mainly driven by the force of the water column sprayed by the deflection nozzle, so that the rotating speed of the nozzle depends on the pressure of the sprayed water column, and if the water pressure in the spray arm is low, the rotating speed of the nozzle is very low, the sweeping frequency of the water column sprayed by the deflection nozzle is directly influenced, and further the cleaning degree is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the first technical problem that will solve is to prior art's current situation, thereby provides one kind and can enlarge the face of wasing and eliminate the spray arm that is used for the cleaning machine who washs the dead angle, improves the cleaning performance.

The second technical problem to be solved by the present invention is to provide a spray arm for a cleaning machine, which can reduce the requirement of the rotation speed on the water pressure so as to continuously maintain the high rotation speed of the nozzle and further improve the cleaning degree.

The utility model discloses the third technical problem that will solve is to prior art's current situation, provides an use the cleaning machine that has above-mentioned spray arm.

The utility model provides a technical scheme that at least one above-mentioned technical problem adopted does:

the utility model provides a spray arm for cleaning machine, the inside cavity of spray arm forms the runner, water inlet, the hole for water spraying that is linked together with the runner are seted up to spray arm's lateral wall, be provided with the pivoted nozzle in the hole for water spraying, it has the spout along hole for water spraying eccentric arrangement to open on this nozzle, the bottom of nozzle is provided with and is located spray arm and can drive the rotatory blade of nozzle under the rivers impact, and this blade is at least two and interval arrangement on the periphery wall of nozzle.

Preferably, the cross section of the nozzle is in an inverted U-shaped structure, and the spout is opened at the closed end of the U-shaped structure and is arranged close to one side of the closed end. By adopting the structure, water passing through the water spraying holes can be guided and rotates along with the nozzle to form the conical water column, compared with the linear water column sprayed in the prior art, the conical water column has wider coverage, is beneficial to eliminating the cleaning dead angle and covers all areas for placing tableware.

Preferably, the inside of the nozzle is hollow to form a liquid collecting cavity with a bottom water inlet, the closed end of the U-shaped structure forms an arc-shaped structure which is arched upwards, and the nozzle is arranged on the arc-shaped structure and communicated with the liquid collecting cavity. The structure can collect and guide water passing through the water spraying holes, is favorable for reducing energy loss and improves the jetting stability of the conical water column.

Preferably, the vertical part of the U-shaped structure is rotatably arranged through the water spray hole, the outer peripheral wall of the vertical part and the inner peripheral wall of the water spray hole are provided with gaps, and the arc-shaped structure is positioned above the water spray hole. Form the clearance here, on the one hand, it is smooth and easy to make the nozzle rotate, on the other hand, because the nozzle is to the collection and the effect of blockking of water under high pressure of water jet orifice department, lead to nozzle department to bear very big water pressure, this water pressure is unstable if the distribution in nozzle week, just lead to the nozzle to rock easily and take place the jamming, under the first clearance and the above-mentioned clearance fit that roof cooperation formed in following projection and spray arm, can sluicing, the pressure release to the water under high pressure in unbalanced region, thereby adjust the ascending water pressure of nozzle week to balanced, ensure that the nozzle is rotatory smooth and easy, eliminate thoroughly the jamming problem.

In order to improve the assembly stability, the spray arm is provided with an assembly ring which extends upwards along the edge of the water spraying hole, the inner peripheral wall of the assembly ring is flush with the inner peripheral wall of the water spraying hole, and the assembly ring and the inner peripheral wall of the water spraying hole jointly form an assembly surface which is in rotating fit with the vertical part of the nozzle.

Preferably, the blades are multiple and are arranged at intervals along the circumferential direction at the edge of the open end of the U-shaped structure.

The utility model discloses in, the spout is seted up on the roof and/or the lateral wall of nozzle for along with the nozzle rotation and erupt the efflux water column that has the conical surface structure. Compared with the linear water column sprayed in the prior art, the conical water column has wider coverage, is favorable for eliminating cleaning dead angles and covers all areas for placing tableware.

Preferably, the upper surface of the blade is provided with a convex column which extends upwards and is matched with the inner top wall of the spray arm at a position close to the peripheral wall of the nozzle. The structure greatly reduces the friction fit area between the nozzle and the spray arm, is favorable for reducing energy loss and improves the rotation smoothness of the nozzle.

Further preferably, the convex column is shaped into a hemispherical structure which is arched upwards. The structure is favorable for further reducing friction, improving the rotation smoothness of the nozzle and reducing energy loss.

Further preferably, the inner top wall of the spray arm is provided with a boss circumferentially arranged along the edge of the water spray hole, and the convex column is in friction sliding fit with the boss. This structure can increase the blade upper surface whole with spray the arm interior distance between the roof, be convenient for on the basis of nozzle and hole for water spraying fit clearance, realize sluicing, pressure release, the ascending water pressure balance of adjustment nozzle circumference.

Preferably, the nozzle is provided with a positioning column vertically extending below the blade, and correspondingly, the inner bottom wall of the spraying arm is provided with a socket for inserting the positioning column and rotationally matching with the positioning column. This structure is convenient for carry on spacingly from the axis of rotation to the nozzle, improves its rotation on the one hand and smoothly reaches stability, and on the other hand keeps the interval between bottom wall in blade and the spray arm, avoids interfering.

Preferably, in an assembled state, a first gap is formed between the upper surface of the blade and the inner top wall of the spray arm, and a second gap is formed between the lower surface of the blade and the inner bottom wall of the spray arm. On the basis of the fit clearance between the nozzle and the water spray hole, the first clearance is matched with the nozzle, so that water drainage and pressure relief are realized conveniently, and the water pressure balance on the circumferential direction of the nozzle is adjusted; the second gap serves to prevent interference between the blade and the inner bottom wall of the spray arm.

As a solution to the vane structure, the vane extends in the radial direction of the nozzle.

As another scheme of the vane structure, the vane includes a first portion and a second portion, a first end of the first portion is connected to the outside of the nozzle and extends in the radial direction of the nozzle, a first end of the second portion is connected to a second end of the first portion, the second end of the second portion is a free end, and the second portion extends obliquely from the first end to the second end in the circumferential direction of the nozzle.

Preferably, the runner of the spray arm extends along the length direction, the water inlet is positioned at the central part of the first side wall, the plurality of water spray holes are distributed at intervals along the length direction of the runner, and the nozzle is arranged at the water spray hole close to the end part of the runner. Due to the different shapes of the washing cavities, the spray arms cannot cover all washing areas in the length and width directions at the same time, and the spray nozzles are arranged at the end parts close to the spray arms, so that a larger scanning range is provided, and the cleaning dead angle is eliminated.

The cleaning machine comprises a box body, a water pumping mechanism and the spraying arm, wherein the spraying arm can be rotatably arranged in the box body, and the water pumping mechanism is used for pumping water at the bottom of the box body into the spraying arm.

According to the volume size difference of washing chamber, can set up the spray arm in different positions: the spraying arm is arranged close to the bottom of the box body, and a water spraying hole of the spraying arm is arranged upwards; or the spray arm is arranged in the middle of the box body, and the water spray holes of the spray arm are arranged downwards or upwards; or the spray arm is arranged at the top of the box body, and the water spray holes of the spray arm are arranged downwards.

Compared with the prior art, the utility model has the advantages of: the utility model discloses set up the nozzle that can rotate on the hole for water spraying of spray arm, open on this nozzle along the eccentric spout of arranging of hole for water spraying, in the rotation of spray arm, the spout is rotated along with the nozzle and is erupted the toper water column that the lower extreme is little, the upper end is big, such water column covers the face greatly to improve than the straight line water column, and along with the rotation of spray arm itself, this toper water column can cover bigger washing area, is favorable to eliminating and washs the dead angle, improves the cleaning performance; the utility model discloses set up the blade bottom the nozzle, under the rivers impact in the spray arm, the blade rotates and drives the nozzle rotation, and the rotary power of nozzle comes from the blade of arranging along its periphery, and the blade is big with the rivers contact surface, thereby it is rotatory to drive the nozzle that the transmission rivers impact energy that just can be better is favorable to increasing nozzle rotational speed and stability to improve the clean degree of spraying within the scope.

Drawings

Fig. 1 is a schematic structural view of a spray arm in embodiment 1 of the present invention;

FIG. 2 is a cross-sectional view of FIG. 1;

FIG. 3 is an enlarged view of a portion of FIG. 2;

fig. 4 is a schematic structural view of a hidden part of a housing of a spray arm in embodiment 1 of the present invention;

fig. 5 is a schematic structural view of a nozzle in embodiment 1 of the present invention;

fig. 6 is a schematic structural view of a nozzle in embodiment 2 of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

Example 1:

as shown in fig. 1 to 5, a flow channel 11 is formed in a hollow interior of a spray arm 1 for a cleaning machine in the present embodiment, a water inlet 12 communicated with the flow channel 11 is formed in a lower side wall of the spray arm 1, a water spraying hole 13 communicated with the flow channel 11 is formed in an upper side wall of the spray arm 1, a rotatable nozzle 2 is arranged in the water spraying hole 13, a nozzle 21 eccentrically arranged along the water spraying hole 13 is formed on the nozzle 2, a blade 20 located in the spray arm 2 and capable of driving the nozzle 2 to rotate under water flow impact is arranged at the bottom of the nozzle 2, and the blade 20 is at least two and is arranged at intervals on an outer peripheral wall of the nozzle 2.

Specifically, the cross section of the nozzle 2 is in an inverted U-shaped structure, and the spout 21 is opened at the closed end of the U-shaped structure and is arranged close to one side of the closed end. The vanes 20 are plural and are circumferentially spaced apart at the edge of the open end of the U-shaped structure. The nozzle 21 is opened on the top wall and/or the side wall of the nozzle 2 and is used for spraying a jet water column with a conical surface structure along with the rotation of the nozzle 2. By adopting the structure, water passing through the water spraying holes 13 can be guided and rotates along with the nozzle 2 to form a conical water column, compared with a linear water column sprayed in the prior art, the conical water column has wider coverage, is beneficial to eliminating a cleaning dead angle and covers all areas for placing tableware.

The nozzle 2 is hollow to form a liquid collecting cavity 23 with a bottom water inlet 22, the closed end of the U-shaped structure forms an arc structure 24 which is arched upwards, and the nozzle 21 is opened on the arc structure 24 and communicated with the liquid collecting cavity 23. The structure can collect and guide water passing through the water spraying holes 13, is favorable for reducing energy loss and improving the jetting stability of the conical water column.

The vertical portion 25 of the U-shaped structure is rotatably disposed through the water spraying hole 13, and a gap 251 is formed between the outer circumferential wall of the vertical portion 25 and the inner circumferential wall of the water spraying hole 13, the gap 251 enables the nozzle 2 to rotate smoothly, and the arc-shaped structure 24 is located above the water spraying hole 13. The upper surface of the blade 20 is provided with a convex column 201 which extends upwards and is matched with the inner top wall of the spray arm 1 at the position close to the outer peripheral wall of the nozzle 2. The boss 201 is shaped as a hemispherical structure that is upwardly arched. The convex column 201 structure greatly reduces the friction fit area between the nozzle 2 and the spray arm 1, is beneficial to reducing energy loss and improving the smoothness of nozzle rotation. The inner top wall of the spray arm 1 is provided with a boss 14 arranged along the periphery of the water spraying hole 13, and the convex column 201 is in friction sliding fit with the boss 14. In the assembled state, a first gap 100 is formed between the upper surface of the blade 20 and the inner ceiling of the shower arm 1.

Because the collection of nozzle 2 to the water under high pressure of hole for water spraying 13 department with block the effect, lead to nozzle 2 department to bear very big water pressure, this water pressure is unstable if the distribution in nozzle 2 circumference, just lead to nozzle 2 to rock easily and take place the jamming, under the first clearance 100 that the cooperation of roof formed in projection 201 and spray arm 1 was cooperated with above-mentioned clearance 251, can sluicing, the pressure release to the water under high pressure in unbalanced region, thereby adjust the ascending water pressure of nozzle circumference to balanced, ensure that nozzle 2 is rotatory smooth and easy, eliminate thoroughly and eliminate the jamming problem.

The spray arm 1 is provided with a mounting ring 15 extending upwards along the edge of the water spray hole 13, the inner peripheral wall of the mounting ring 15 is flush with the inner peripheral wall of the water spray hole 13, and the inner peripheral wall form a mounting surface which is matched with the vertical part 25 of the nozzle 2 in a rotating mode, so that the mounting stability is further improved.

In the present embodiment, the nozzle 2 is provided with a positioning post 26 extending vertically below the blade 20, and correspondingly, the inner bottom wall of the spray arm 1 is provided with a socket 16 for inserting the positioning post 26 and rotationally matching with the positioning post 26. The structure is convenient for limiting the nozzle 2 from the rotating axis, on one hand, the smooth rotation and the stability of the nozzle are improved, and the clamping stagnation is avoided; on the other hand, the distance between the blade 20 and the inner bottom wall of the shower arm 1 is maintained to avoid interference. In the assembled state, a second gap 200 is formed between the lower surface of the blade 20 and the inner bottom wall of the shower arm 1. The second gap 200 serves to prevent interference between the blade 20 and the bottom wall of the spray arm 1.

The runner 11 of the spray arm 1 extends along the length direction, the water inlet 12 is positioned at the central part of the lower side wall, a plurality of water spray holes 13 are arranged at intervals along the length direction of the runner 11, and the nozzle 2 is arranged at the position of the water spray hole 13 close to the end part of the runner 11. Due to the different shapes of the washing cavities, the spray arm 1 cannot cover all washing areas in the length and width directions at the same time, and the spray nozzle 2 is arranged at the end part close to the spray arm 1, so that the larger scanning range is favorably provided, and the cleaning dead angle is eliminated.

The vanes 20 of the present embodiment extend in the radial direction of the nozzle 2. When such straight blades are used, the force of rotation of the blades 20 with the water jet may be small, and in this case, a sub-flow passage 17 for increasing the water velocity at the nozzle 2 and the corresponding water jet hole 13 may be provided in the spray arm 1. The auxiliary runner 17 is located at the end of the spray arm 1, a baffle 18 which is matched with the inner wall of the runner 11 and encloses the auxiliary runner 17 is arranged in the spray arm 1, a water passing opening 181 is formed in the position, facing the center of the runner 11, of the baffle 18, the baffle 18 is inclined or bent and extended from the edge of the water passing opening 181 to form a throat structure 182 for pressurizing water flow, and in the assembled state, the outer end of the blade 20 is arranged corresponding to the water passing opening 181 so as to increase the driving force for the blade 20. In this case, the rotation of the nozzle 2 can be realized without providing the sub-flow passage 17, and the sub-flow passage 17 can be selectively provided in order to increase the rotation speed of the nozzle 2 in the present embodiment.

It should be noted that, in the present embodiment, one nozzle opening 21 is provided in the nozzle 2, but in actual production, more than one nozzle opening 21 may be provided as needed.

The cleaning machine of this embodiment includes box and pump water mechanism (not shown in the figure), still includes above-mentioned spray arm 1, and spray arm 1 can locate in the box with rotating, and pump water mechanism is arranged in pump to spray arm 1 with the water pump of bottom half.

According to the volume difference of washing chamber, can set up spray arm 1 in different positions for emphatically eliminate specific regional washing dead angle: the spray arm 1 is arranged close to the bottom of the box body, and the water spray holes 13 of the spray arm 1 are arranged upwards;

or the spray arm 1 is arranged in the middle of the box body, and the water spray holes 13 of the spray arm 1 are arranged downwards or upwards;

or the spray arm 1 is arranged at the top of the box body, and the water spray holes 13 of the spray arm 1 are arranged downwards.

That is, the spray arm of this embodiment both can regard as bottom spray set also can regard as well as upper and middle layer spray set to use, both is applicable to the basin formula cleaning machine, also is applicable to the bigger front-open type dish washer of volume.

In the embodiment, the rotatable nozzle 2 is arranged on the water spraying hole 13 of the spray arm 1, the nozzle 2 is provided with the nozzle 21 which is eccentrically arranged along the water spraying hole 13, and in the rotating process of the spray arm 1, the nozzle 21 rotates along with the nozzle 2 to spray the conical water column a with a small lower end and a large upper end, so that the coverage area of the water column per se is greatly improved compared with that of a straight line type water column, and along with the rotation of the spray arm 1 per se, the conical water column a can cover a larger cleaning area b, which is beneficial to eliminating the cleaning dead angle and improving the cleaning effect; in the embodiment, the blades 20 are arranged at the bottom of the nozzle 2, under the impact of water flow in the spray arm 1, the blades 20 rotate to drive the nozzle 2 to rotate, the contact surface between the blades 20 and the water flow is large, and the impact energy of the water flow can be better transmitted to drive the nozzle 2 to rotate, so that the rotating speed and the stability of the nozzle 2 can be increased, and the cleaning degree in a spray range can be improved; the rotating power of the nozzle 2 comes from the blades 20 arranged along the periphery of the nozzle, so that the force applied to the nozzle 2 in the circumferential direction is relatively uniform, the rotating stability of the nozzle 2 is improved, and the uniformity of the cleaning degree in the spraying range is improved.

Example 2:

this example differs from example 1 only in that: the blade structure is different.

As shown in fig. 6, the vane 20' of the present embodiment includes a first portion 201' and a second portion 202', a first end of the first portion 201' is connected to the outside of the nozzle 2' and extends along the radial direction of the nozzle 2', a first end of the second portion 202' is connected to a second end of the first portion 201', a second end of the second portion 202' is a free end, and the second portion 202' extends obliquely along the circumferential direction of the nozzle 2' from the first end to the second end.

Directional terms such as "front", "rear", "upper", "lower", "left", "right", "side", "top", "bottom", and the like are used in the description and claims of the present invention to describe various example structural portions and elements of the present invention, but these terms are used herein for convenience of description only and are determined based on example orientations shown in the drawings. Because the disclosed embodiments may be arranged in different orientations, these directional terms are for illustrative purposes only and should not be construed as limiting, and for example, "upper" and "lower" are not necessarily limited to orientations opposite or consistent with the direction of gravity.

Claims

1. The utility model provides a spray arm for cleaning machine, the inside cavity of spray arm (1) forms runner (11), water inlet (12), hole for water spraying (13) that are linked together with runner (11) are seted up to the lateral wall of spray arm (1), be provided with in hole for water spraying (13) can pivoted nozzle (2), and it has spout (21) along hole for water spraying (13) eccentric arrangement to open on this nozzle (2), its characterized in that: the bottom of the spray nozzle (2) is provided with blades (20) which are positioned in the spray arm (1) and can drive the spray nozzle (2) to rotate under the impact of water flow, and the blades (20) are at least two and are arranged on the peripheral wall of the spray nozzle (2) at intervals.

2. The spray arm for a cleaning machine of claim 1, wherein: the cross section of the nozzle (2) is of an inverted U-shaped structure, and the nozzle (21) is arranged at the closed end of the U-shaped structure and close to one side of the closed end.

3. The spray arm for a cleaning machine of claim 2 wherein: the inside of the nozzle (2) is hollow to form a liquid collecting cavity (23) with a bottom water inlet (22), the closed end of the U-shaped structure forms an arc-shaped structure (24) which is arched upwards, and the nozzle (21) is arranged on the arc-shaped structure (24) and communicated with the liquid collecting cavity (23).

4. The spray arm for a cleaning machine of claim 3, wherein: the vertical part (25) of the U-shaped structure can be rotatably arranged through the water spraying hole (13), a gap (251) is reserved between the outer peripheral wall of the vertical part (25) and the inner peripheral wall of the water spraying hole (13), and the arc-shaped structure (24) is positioned above the water spraying hole (13).

5. The spray arm for a cleaning machine of claim 4 wherein: the spray arm (1) is provided with an assembly ring (15) extending upwards along the edge of the water spraying hole (13), and the inner peripheral wall of the assembly ring (15) is flush with the inner peripheral wall of the water spraying hole (13) and forms an assembly surface rotationally matched with the vertical part (25) of the nozzle (2) together.

6. The spray arm for a cleaning machine of claim 2 wherein: the blades (20) are multiple and are arranged at intervals along the circumferential direction at the edge of the open end of the U-shaped structure.

7. The spray arm for a cleaning machine of any one of claims 1 to 4 wherein: the nozzle (21) is arranged on the top wall and/or the side wall of the nozzle (2) and is used for jetting a jet water column with a conical surface structure along with the rotation of the nozzle (2).

8. The spray arm for a cleaning machine of any one of claims 1 to 4 wherein: the upper surface of the blade (20) is provided with a convex column (201) which extends upwards and is matched with the inner top wall of the spray arm (1) at the position close to the outer peripheral wall of the nozzle (2).

9. The spray arm for a cleaning machine of claim 8 wherein: the convex column (201) is shaped into an upward arched hemispherical structure.

10. The spray arm for a cleaning machine of claim 8 wherein: the inner top wall of the spray arm (1) is provided with a boss (14) which is circumferentially arranged along the edge of the water spraying hole (13), and the convex column (201) is in friction sliding fit with the boss (14).

11. The spray arm for a cleaning machine of any one of claims 1 to 4 wherein: a positioning column (26) vertically extending below the blade (20) is arranged in the nozzle (2), and correspondingly, a socket (16) for inserting the positioning column (26) and rotationally matching with the positioning column (26) is arranged on the inner bottom wall of the spray arm (1).

12. The spray arm for a cleaning machine of claim 11 wherein: in the assembled state, a first gap (100) is formed between the upper surface of the blade (20) and the inner top wall of the spray arm (1), and a second gap (200) is formed between the lower surface of the blade (20) and the inner bottom wall of the spray arm (1).

13. The spray arm for a cleaning machine of any one of claims 1 to 4 wherein: the vanes (20) extend in the radial direction of the nozzle (2).

14. The spray arm for a cleaning machine of any one of claims 1 to 4 wherein: the blade comprises a first part (201 ') and a second part (202 '), wherein the first end of the first part (201 ') is connected with the outside of the nozzle and extends along the radial direction of the nozzle, the first end of the second part (202 ') is connected with the second end of the first part (201 '), the second end of the second part (202 ') is a free end, and the second part (202 ') is obliquely arranged along the circumferential direction of the nozzle from the first end to the second end.

15. The spray arm for a cleaning machine of any one of claims 1 to 4 wherein: the flow channel (11) of the spray arm (1) extends along the length direction, the water inlet (12) is located in the center of the first side wall, the plurality of water spraying holes (13) are arranged at intervals along the length direction of the flow channel (11), and the nozzle (2) is arranged at the position, close to the end part of the flow channel (11), of the water spraying hole (13).

16. The utility model provides a cleaning machine, includes box and pump water mechanism, its characterized in that: the spray arm (1) as claimed in any one of claims 1 to 14 is further included, the spray arm (1) is rotatably arranged in the box body, and the water pumping mechanism is used for pumping water at the bottom of the box body into the spray arm (1).

17. The cleaning machine of claim 16, wherein: the spray arm (1) is arranged close to the bottom of the box body, and the water spray holes (13) of the spray arm (1) are arranged upwards.

18. The cleaning machine of claim 16, wherein: the spray arm (1) is arranged in the middle of the box body, and the water spray holes (13) of the spray arm (1) are arranged downwards or upwards.

19. The cleaning machine of claim 16, wherein: the spray arm (1) is arranged at the top of the box body, and the water spray holes (13) of the spray arm (1) are arranged downwards.