CN117357023A - Spray arm for cleaning machine and cleaning machine - Google Patents

Abstract

The utility model relates to a spray arm for a cleaning machine and the cleaning machine, wherein a spray nozzle capable of rotating along with the spray arm and rotating simultaneously is arranged on the spray arm, and a water column sprayed by the spray nozzle is matched with a water column sprayed by a water spraying hole, so that the cleaning range is favorably diffused, the cleaning dead angle is eliminated, and the cleaning effect is improved; the impeller is arranged at the bottom of the nozzle, the impeller rotates to drive the nozzle to rotate under the impact of water flow in the spray arm, the rotating power of the nozzle is from the impeller arranged along the periphery of the impeller, the contact surface of the impeller and the water flow is large, and the energy of the water flow impact can be better transmitted to drive the nozzle to rotate, so that the rotating speed and the stability of the nozzle are improved, and the cleanliness in the spray range is improved; the impeller of the utility model relatively seals the water collecting cavity, so that the water flowing into the nozzle is more stable, and the water is conveniently split towards the water spraying port, thereby reducing energy loss and improving the injection lift of the nozzle.

Description

Spray arm for cleaning machine and cleaning machine

Technical Field

The utility model relates to the technical field of dish washers, in particular to a spray arm for a cleaning machine and the cleaning machine.

Background

A dishwasher is generally provided with a shower arm for washing tableware or fruits and vegetables by spraying a water column. For example, chinese patent publication No. CN204813755U (application No. CN 201520531714.5) and Chinese patent publication No. CN209932651U (application No. CN201920258610. X) disclose corresponding spray arm structures.

For the spray arm of above-mentioned structure, the water inlet is located on one lateral wall of spray arm, and goes out water to both sides through this water inlet pair, and the spray arm passes through the viscous force drive that water dispersed in the runner and rotates, opens on another lateral wall of spray arm has the hole for spraying the water column. Because in current dish washer, bowl and dish are fixed the back in bowl frame structure, and the bowl dish is unchangeable on the bowl frame, and the water column that spray arm sprayed is approximately straight line (strip) form, this just leads to spraying the limited scope of water column, can not compromise the surface of all tableware, has the washing dead angle, influences cleaning effect. Meanwhile, a dish washer with a rectangular washing cavity is easy to generate a washing dead angle.

The Chinese patent No. CN204445748U discloses a dishwasher sprayer and a dishwasher (application No. CN 201520047405.0), wherein the sprayer comprises a water storage cavity, a spraying surface and a mounting surface, a plurality of spraying holes communicated with the water storage cavity are formed in the spraying surface, a water inlet is formed in the mounting surface, a spray head is arranged on the spraying surface, at least two spray head spraying holes are formed in the spray head, a water channel communicated with the water storage cavity is formed in the spray head, and the spray head spraying holes are communicated with the water channel. When the sprayer rotates to spray, the spray heads on the sprayer spray simultaneously, and as the spray heads are provided with at least two spray head spray holes, the effective spray area is increased, and the spray dead angle is reduced.

The sprayer with the structure is favorable for reducing the cleaning dead angle, but when the water column is sprayed, the power for rotating the spray head is mainly driven by the force of the water column sprayed by the deflection spraying holes, so that the rotating speed of the spray head depends on the pressure of the sprayed water column, if the water pressure in the sprayer is lower, the rotating speed of the spray head is very low, the sweeping frequency of the water column sprayed by the deflection spraying holes is directly influenced, and the cleaning degree is further influenced. Meanwhile, water entering the spray head is easy to collide with each other to be disturbed, so that water flow energy loss is caused, the lift of the sprayed water column is influenced, and further the cleaning effect is influenced.

Disclosure of Invention

The first technical problem to be solved by the utility model is to provide a spray arm for a cleaning machine, which can reduce the requirement of rotating speed on water pressure so as to continuously maintain a higher rotating speed of a nozzle and further improve the cleanliness.

The second technical problem to be solved by the utility model is to provide a spray arm for a cleaning machine, which can perform steady flow control and diversion on water entering a nozzle so as to reduce energy loss and maintain high spray lift.

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:

the utility model provides a spray arm for cleaning machine, includes body and nozzle, the inside cavity of body forms the runner, the body is provided with water inlet, the hole for water spraying that is linked together with the runner, it has the delivery port to open on the body roof, the nozzle rotationally connects in this delivery port department, the nozzle is discoid and has hollow water collecting cavity, the open water jet that forms the bottom and open, open the top of nozzle bottom and arrange and be linked together with the water collecting cavity in a tilting way, the open impeller that can drive nozzle pivoted under the rivers impact is installed to the bottom department of nozzle, thereby this impeller inlays and seals the water collecting cavity in the bottom is open, the central part of impeller is opened and is supplied the water inlet in the water collecting cavity of runner water entering.

Preferably, the impeller comprises a top cover and a sleeve body extending downwards from the outer edge of the top cover, the top cover and the sleeve body jointly enclose a semi-enclosed cavity with a downward opening, the water inlet is formed in the central part of the top cover, and blades capable of rotating under the impact of water flow are arranged in the semi-enclosed cavity. The impeller can generate a larger rotating speed under the impact of water flow, and can prevent the blades from circumferentially dispersing the water flow to influence the water inflow of the water inlet so as to keep larger water flow in the nozzle.

Preferably, the top cover is gradually recessed downwards from the edge to the water inlet in the center of the top cover, the water spray openings of the nozzles are arranged corresponding to the edge of the top cover, and the upper surface of the top cover forms a diversion cambered surface for diversion of water flow conveyed upwards by the water inlet to the water spray openings along the radial direction. By adopting the structure, water entering the water collecting cavity can be rapidly split and guided, and the phenomenon that the water flow is disturbed in the water collecting cavity due to impact and energy loss is avoided, so that the jet water column of the nozzle keeps higher lift and impact force.

Preferably, the blades are a plurality of and are circumferentially distributed on the lower surface of the top cover at intervals, and the outer ends of the blades are engaged with the inner peripheral wall of the sleeve body. The blade comprises a first part and a second part, wherein the first part extends along the radial direction of the water inlet, the first end of the first part is close to the water inlet, the second part is obliquely arranged relative to the first part, the first end of the second part is connected with the second end of the first part, and the second end of the second part is connected with the inner peripheral wall of the sleeve body. This structure is favorable to improving impeller rotational speed.

In the utility model, the inner peripheral wall of the opening at the bottom of the nozzle is provided with a first gear ring which is arranged along the circumferential direction, and correspondingly, the outer peripheral wall of the sleeve body is provided with a second gear ring which can be meshed with the first gear ring. By adopting the structure, the nozzle is driven to rotate through the rotation of the impeller, and the rotating speed and the rotating stability of the nozzle are improved.

Preferably, the impeller is arranged at the bottom opening of the nozzle in a vertically floating manner relative to the nozzle through the cooperation of the first gear ring and the second gear ring, the volume of the water collecting cavity is reduced in an upward floating state of the impeller, and the volume of the water collecting cavity is increased in a downward floating state of the impeller. Because the water pressure in the spray arm flow channel is not always stable, the specific water pressure is related to the change of the washing environment and the real-time power of the motor, a certain float exists, and the change of the water pressure directly affects the rotation stability and jet flow stability of the nozzle; by adopting the structure, the impeller can float up and down correspondingly with the water pressure, and the flow of jet flow of the nozzle is balanced to a certain extent by changing the volume of the water collecting cavity, so that the nozzle can maintain relatively stable rotating speed.

Preferably, a water inlet gap is formed between the impeller bottom and the inner bottom wall of the spray arm, and a limit column capable of preventing the impeller bottom wall from contacting with the inner bottom wall of the spray arm is arranged at the bottom of the sleeve body. The structure can keep the impeller in suspension all the time without affecting the water inlet of the water inlet.

For the convenience of assembly, the outer peripheral wall of the nozzle is provided with a supporting table which can prop against the inner top wall of the spray arm; and/or the peripheral wall of the top of the nozzle is provided with a protrusion which is matched and limited with the outer top wall of the spray arm.

Preferably, the water spraying ports are two groups and are symmetrically arranged at two sides of the water inlet, and the inclination directions of the two water spraying ports are opposite. By adopting the structure, the nozzle can rotate smoothly and stably by being driven by the impeller.

In the utility model, a jet flow sleeve extending from a water jet port along the edge along the jet flow direction is arranged on the top wall of the nozzle, an air inlet sleeve is sleeved on the jet flow sleeve, a gap is formed between the air inlet sleeve and the jet flow sleeve, and an air inlet channel for communicating outside air with the gap is arranged on the side part of the jet flow sleeve, so that air is sucked into the gap under the state of jetting water column. In the jet process, negative pressure is generated at the gap, so that external air is sucked into and mixed with the water column through the air inlet channel to form a cavitation water column carrying air, and when the cavitation water column is hit on the surface of a cleaned object, the stripping force to pollutants can be improved at the moment of bubble breakage, so that the cleaning effect is improved.

Preferably, the jet sleeve is provided with an outer sleeve which is arranged around the periphery of the jet sleeve and is close to the upper port, the air inlet sleeve is arranged in the outer sleeve, the gap is formed between the lower port of the air inlet sleeve and the upper port of the outer sleeve, the air inlet channel is arranged between the outer sleeve and the jet sleeve, the upper end of the air inlet channel is communicated with the gap, and the lower end of the air inlet channel extends below the outer sleeve. The structure encloses the gap and the air inlet channel for protection so as to prevent blockage.

Preferably, the lower end of the air inlet sleeve is propped against the upper end surface of the jet flow sleeve, the inner diameter of at least the lower part of the air inlet sleeve gradually increases from top to bottom to form a conical section, and the lower end of the conical section corresponds to the upper end of the air inlet channel and forms a gap. The inner diameter of the upper part of the air inlet sleeve is larger than the inner diameter of the jet sleeve.

The cleaning machine comprises a box body and a water pumping mechanism, and further comprises the spray arm, wherein the spray 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 spray arm.

Compared with the prior art, the utility model has the advantages that: according to the utility model, the spray arm is provided with the spray nozzle which can rotate along with the spray arm and simultaneously rotates, and the water column sprayed by the spray nozzle is matched with the water column sprayed by the water spraying hole, so that the cleaning range is favorably diffused, the cleaning dead angle is eliminated, and the cleaning effect is improved; according to the utility model, the impeller is arranged at the bottom of the nozzle, the impeller rotates to drive the nozzle to rotate under the impact of water flow in the spray arm, the rotating power of the nozzle is from the impeller, the contact surface of the impeller and the water flow is large, and the impact energy of the water flow can be better transmitted to drive the nozzle to rotate, so that the rotating speed and the stability of the nozzle are favorably increased, and the cleanliness in the spray range is improved; the impeller of the utility model relatively seals the water collecting cavity, so that the water flowing into the nozzle is more stable, and the water is conveniently split towards the water spraying port, thereby reducing energy loss and improving the injection lift of the nozzle.

Drawings

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

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

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

FIG. 4 is a bottom view of a nozzle in an embodiment of the utility model;

FIG. 5 is a schematic view of a impeller according to an embodiment of the present utility model;

FIG. 6 is a schematic view of the bottom structure of the impeller according to the embodiment of the present utility model;

fig. 7 is a cross-sectional view of a nozzle in an embodiment of the utility model.

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 spray arm for a cleaning machine in this embodiment includes a body 1 and a nozzle 2, the body 1 extends along a length direction, a flow channel 11 is formed in the body 1, a water inlet 12 communicating with the flow channel 11 is provided at a central portion of a bottom wall of the body 1, a plurality of water spray holes 13 communicating with the flow channel 11 are provided on a top wall of the body 1, a water outlet 14 arranged near an end portion of the flow channel 11 is further provided on the top wall of the body 1, and the nozzle 2 is rotatably connected to the water outlet 14.

In this embodiment, the nozzle 2 is disc-shaped and has a hollow water collecting cavity 21, the bottom of the nozzle 2 is opened to form a bottom opening 22, the top of the nozzle 2 is opened with a water spray opening 23 which is obliquely arranged and is communicated with the water collecting cavity 21, an impeller 3 which can drive the nozzle 2 to rotate under the impact of water flow is installed at the bottom opening 22 of the nozzle 2, the impeller 3 is embedded in the bottom opening 22 to seal the water collecting cavity 21, and a water inlet 311 for water in the flow channel 11 to enter the water collecting cavity 21 is opened at the central part of the impeller 3.

The impeller 3 includes a top cover 31 and a sleeve body 32 extending downward from the outer edge of the top cover 31, the top cover 31 and the sleeve body 32 together enclose a semi-enclosed cavity 312 with a downward opening, a water inlet 311 is formed in the central portion of the top cover 31, and blades 33 capable of rotating under the impact of water flow are disposed in the semi-enclosed cavity 312. The above structure can not only generate a larger rotating speed under the impact of water flow, but also prevent the blades 33 from circumferentially dispersing the water flow to influence the water inflow of the water inlet 311 so as to keep a larger water flow in the nozzle 2.

The top cover 31 is gradually recessed downwards from the edge to the water inlet 311 in the center, the water spray opening 23 of the nozzle 2 is arranged corresponding to the edge of the top cover 31, and the upper surface of the top cover 31 forms a diversion cambered surface 313 for diversion of water flow conveyed upwards by the water inlet 311 to the water spray opening 23 along the radial direction. By adopting the structure, water entering the water collecting cavity 21 can be rapidly split and guided, and the phenomenon that the water flow is disturbed due to impact in the water collecting cavity 21 and energy loss is caused is avoided, so that the jet water column of the nozzle 2 keeps higher lift and impact force.

The blades 33 are a plurality of and circumferentially spaced apart on the lower surface of the top cover 31, and the outer ends of the blades 33 engage with the inner peripheral wall of the sleeve 32. The vane 33 includes a first portion 331 and a second portion 332, the first portion 331 extends along a radial direction of the water inlet 311 and has a first end disposed near the water inlet 311, the second portion 332 is disposed obliquely with respect to the first portion 331 and has a first end connected to a second end of the first portion 331 and a second end engaged with an inner peripheral wall of the housing 32. This structure is advantageous in increasing the rotational speed of the impeller 3.

In the present embodiment, the inner peripheral wall of the bottom opening 22 of the nozzle 2 is provided with a first ring gear 221 arranged in the circumferential direction, and correspondingly, the outer peripheral wall of the sleeve 32 is provided with a second ring gear 321 capable of meshing with the first ring gear 221. By adopting the structure, the rotation of the impeller 3 drives the nozzle 2 to rotate, so that the rotation speed and the rotation stability of the nozzle 2 are improved.

The impeller 3 is arranged at the bottom opening 22 of the nozzle 2 in a vertically floating manner relative to the nozzle 2 through the cooperation of the first gear ring 221 and the second gear ring 321, the volume of the water collecting cavity 21 is reduced in an upward floating state of the impeller 3, and the volume of the water collecting cavity 21 is increased in a downward floating state of the impeller 3. Because the water pressure in the spray arm runner 11 is not always stable, the specific water pressure is related to the change of the washing environment and the real-time power of the motor, a certain float exists, and the change of the water pressure directly affects the rotation stability and jet flow stability of the nozzle; by adopting the structure, the impeller can float up and down correspondingly with the water pressure, and the flow of jet flow of the nozzle is balanced to a certain extent by changing the volume of the water collecting cavity, so that the nozzle can maintain relatively stable rotating speed.

A water inlet gap 300 is formed between the bottom of the impeller 3 and the inner bottom wall of the spray arm, and a limit post 322 capable of preventing the bottom wall of the impeller 3 from contacting the inner bottom wall of the spray arm is arranged at the bottom of the sleeve body 32. This structure can keep the impeller 3 in suspension all the time without affecting the water intake of the water inlet 311.

For ease of assembly, the outer peripheral wall of the nozzle 2 is provided with a stand 24 which can be brought into abutment with the inner top wall of the spray arm. The outer peripheral wall at the top of the nozzle 2 is provided with a protrusion 25 which is matched and limited with the outer top wall of the spray arm.

The two water spraying ports 23 of this embodiment are symmetrically arranged at two sides of the water inlet 311, and the inclination directions of the two water spraying ports 23 are opposite. With this structure, the nozzle 2 is rotated smoothly and stably in cooperation with the driving of the impeller 3.

In this embodiment, a jet sleeve 26 extending from the nozzle 23 along the edge in the jet direction is disposed on the top wall of the nozzle 2, an air inlet sleeve 4 is sleeved on the jet sleeve 26, a gap 001 is formed between the air inlet sleeve 4 and the jet sleeve 26, and an air inlet channel 002 for communicating outside air with the gap 001 is formed on the side of the jet sleeve 26, so that air is sucked into the gap 011 in the state of jetting water column. In the jet process, negative pressure is generated at the gap 011, so that external air is sucked into and mixed with the water column through the air inlet channel 002 to form a cavitation water column carrying air, and the stripping force on pollutants can be improved at the moment of bubble breakage when the cavitation water column is hit on the surface of a cleaned object, so that the cleaning effect is improved.

The jet casing 26 is provided with a casing 261 arranged around the outer periphery of the jet casing 26 near the upper port, the air intake casing 4 is housed in the casing 261, a gap 001 is formed between the lower port of the air intake casing 4 and the upper port of the casing 261, the air intake passage 002 is opened between the casing 261 and the jet casing 26 with the upper end communicating with the gap 001 and the lower end extending below the casing 261. This structure protects the gap 001 and the intake passage 002 from clogging.

The lower end of the air inlet sleeve 4 is propped against the upper end surface of the jet sleeve 26, the inner diameter of the lower part of the air inlet sleeve 4 gradually increases from top to bottom to form a conical section 41, and the lower end of the conical section 41 corresponds to the upper end of the air inlet channel 002 and forms a gap 001. The upper portion of the air intake sleeve 4 has an inner diameter greater than the inner diameter of the jet sleeve 26.

The cleaning machine of this embodiment includes a box and a pumping mechanism (not shown in the figure), and further includes the spray arm 1, where the spray arm 1 can be rotatably disposed in the box, and the pumping mechanism is used for pumping water from the bottom of the box into the spray arm 1.

In the embodiment, the spray arm is provided with the spray nozzle 2 which can rotate along with the spray arm and simultaneously rotate, and the water column sprayed by the spray nozzle 2 is matched with the water column sprayed by the water spraying hole 13, so that the cleaning range is favorably diffused, the cleaning dead angle is eliminated, and the cleaning effect is improved; according to the embodiment, the impeller 3 is arranged at the bottom of the nozzle 2, under the impact of water flow in the spray arm, the impeller 3 rotates to drive the nozzle 2 to rotate, the rotating power of the nozzle 2 is from the impeller 3, the contact surface between the impeller 3 and the water flow is large, and the energy of the water flow impact can be better transmitted to drive the nozzle 2 to rotate, so that the rotating speed and the stability of the nozzle 2 are improved, and the cleanliness in a spray range is improved; the impeller 3 of the present embodiment relatively seals the water collecting cavity 21, so that the water flowing into the nozzle 2 is more stable, and the water is conveniently split towards the water spraying port 23, thereby reducing energy loss and improving the spraying lift of the nozzle 2.

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 (15)

1. The utility model provides a spray arm for cleaning machine, includes body (1) and nozzle (2), the inside cavity of body (1) forms runner (11), body (1) are provided with water inlet (12), hole for water spraying (13) that are linked together with runner (11), open on body (1) roof has delivery port (14), nozzle (2) rotationally connect in this delivery port (14) department, its characterized in that: the water collecting device is characterized in that the nozzle (2) is disc-shaped and is provided with a hollow water collecting cavity (21), a bottom opening (22) is formed in an opening mode in the bottom of the nozzle (2), a water spraying opening (23) which is obliquely arranged and communicated with the water collecting cavity (21) is formed in the top of the nozzle, an impeller (3) capable of driving the nozzle (22) to rotate under the impact of water flow is arranged at the bottom opening (22) of the nozzle (22), the impeller (3) is embedded in the bottom opening (22) to seal the water collecting cavity (21), and a water inlet (311) for water in a flow channel to enter the water collecting cavity (21) is formed in the central position of the impeller (3).

2. The spray arm for a cleaning machine of claim 1, wherein: the impeller (3) comprises a top cover (31) and a sleeve body (32) extending downwards from the outer edge of the top cover (31), the top cover (31) and the sleeve body (32) jointly enclose a semi-enclosed cavity (312) with a downward opening, the water inlet (311) is formed in the central part of the top cover (31), and blades (33) capable of rotating under the impact of water flow are arranged in the semi-enclosed cavity (312).

3. The spray arm for a cleaning machine of claim 2, wherein: the top cover (31) is gradually recessed downwards from the edge to the water inlet (311) in the center of the top cover, the water spraying holes (23) of the nozzles (22) are arranged corresponding to the edge of the top cover (31), and the upper surface of the top cover (31) forms a diversion cambered surface (313) for diversion of water flow conveyed upwards by the water inlet (311) to the water spraying holes (23) along the radial direction.

4. A spray arm for a cleaning machine as recited in claim 3, wherein: the blades (33) are a plurality of and are distributed on the lower surface of the top cover (31) at intervals along the circumferential direction, and the outer ends of the blades (33) are connected with the inner circumferential wall of the sleeve body (32).

5. The spray arm for a cleaning machine of claim 4, wherein: the blade (33) comprises a first part (331) and a second part (332), the first part (331) extends along the radial direction of the water inlet (311) and the first end is arranged close to the water inlet (311), the second part (332) is obliquely arranged relative to the first part (331) and the first end is connected with the second end of the first part (331), and the second end is connected with the inner peripheral wall of the sleeve body (32).

6. The shower arm for a washer of any one of claims 2-5, wherein: the inner peripheral wall of the nozzle (22) with the bottom open (22) is provided with a first gear ring (221) arranged along the circumferential direction, and correspondingly, the outer peripheral wall of the sleeve body (32) is provided with a second gear ring (321) which can be meshed with the first gear ring (221).

7. The spray arm for a cleaning machine of claim 6, wherein: the impeller (3) can be arranged at the bottom opening (22) of the nozzle (22) in a vertically floating mode relative to the nozzle (22) through the cooperation of the first gear ring (221) and the second gear ring (321), the volume of the water collection cavity (21) is reduced in an upwards floating state of the impeller (3), and the volume of the water collection cavity (21) is increased in a downwards floating state of the impeller (3).

8. The spray arm for a cleaning machine of claim 6, wherein: a water inlet gap (300) is formed between the bottom of the impeller (3) and the inner bottom wall of the spray arm, and a limit column (322) capable of preventing the bottom wall of the impeller (3) from contacting with the inner bottom wall of the spray arm is arranged at the bottom of the sleeve body (32).

9. The shower arm for a washer of any one of claims 1-5, wherein: the outer peripheral wall of the nozzle (22) is provided with a supporting table (24) which can prop against the inner top wall of the spray arm; and/or the peripheral wall at the top of the nozzle (22) is provided with a protrusion (25) which is matched and limited with the outer top wall of the spray arm.

10. The shower arm for a washer of any one of claims 1-5, wherein: the two water spraying ports (23) are symmetrically arranged at two sides of the water inlet (311), and the inclination directions of the two water spraying ports (23) are opposite.

11. The shower arm for a washer of any one of claims 1-5, wherein: the top wall of the nozzle (22) is provided with a jet flow sleeve (26) extending from a water spraying port (23) along the edge along the jet flow direction, the jet flow sleeve (26) is sleeved with an air inlet sleeve (4), a gap (001) is formed between the air inlet sleeve (4) and the jet flow sleeve (26), and the side part of the jet flow sleeve (26) is provided with an air inlet channel (002) for communicating outside air with the gap (001) so as to suck air into the gap (001) in a water spraying column state.

12. The spray arm for a cleaning machine of claim 11, wherein: the jet flow sleeve (26) is provided with a sleeve (261) which surrounds the periphery of the jet flow sleeve (26) and is arranged close to the upper port, the air inlet sleeve (4) is sleeved in the sleeve (261), the gap (001) is formed between the lower port of the air inlet sleeve (4) and the upper port of the sleeve (261), the air inlet channel (002) is formed between the sleeve (261) and the jet flow sleeve (26), the upper end of the air inlet channel is communicated with the gap (001), and the lower end of the air inlet channel extends below the sleeve (261).

13. The spray arm for a cleaning machine of claim 12, wherein: the lower end of the air inlet sleeve (4) is propped against the upper end face of the jet flow sleeve (26), the inner diameter of at least the lower part of the air inlet sleeve (4) gradually increases from top to bottom to form a conical section (41), and the lower end of the conical section (41) corresponds to the upper end of the air inlet channel (002) and forms a gap (001).

14. The spray arm for a cleaning machine of claim 13, wherein: the inner diameter of the upper part of the air inlet sleeve (4) is larger than the inner diameter of the jet sleeve (26).

15. The utility model provides a cleaning machine, includes box and pump water mechanism, its characterized in that: the shower arm of any one of claims 1 to 14, wherein the shower arm 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 shower arm.