A cleaning machine

Abstract

The present invention relates to a cleaning machine, including a box body and a spray arm, wherein a water outlet is provided on the top wall of the spray arm near the end, and a nozzle that can rotate relative to the spray arm is connected to the water outlet, and a first gas-filling structure that can enable the water spray hole to spray a cavitation water column is provided on the spray arm, and a second gas-filling structure that can enable the nozzle to spray a cavitation water column is provided on the top of the nozzle. The present invention sets a nozzle that can rotate relative to the spray arm at the end of the spray arm, and the water column sprayed by the nozzle cooperates with the water column sprayed by the water spray hole, which is conducive to spreading the cleaning range and eliminating the cleaning dead corner, thereby improving the cleaning effect; the main part of the spray arm of the present invention forms a cavitation water column through the first gas-filling structure, and the nozzle forms a cavitation water column through the second gas-filling structure. At the moment when the cavitation water column contacts the pollutant, the bubbles entrained in the water flow burst, which can improve the stripping force of the pollutant on the surface of the object to be cleaned, and further improve the cleaning effect.

Description

Technical Field

[0001] The invention relates to the technical field of dishwashers, and in particular to a washing machine for washing tableware, fruits and vegetables. Background Art

[0002] Dishwashers are generally provided with spray arms that rinse dishes or fruits and vegetables by spraying water jets. For example, Chinese patents with authorization announcement number CN204813755U, "Dishwasher spray arm seat, dishwasher spray arm device and dishwasher" (application number: CN201520531714.5), and Chinese patents with authorization announcement number CN209932651U, "A spray arm of a washing machine" (application number: CN201920258610.X), etc., disclose corresponding spray arm structures.

[0003] For the spray arm of the above structure, the water inlet is located on one side wall of the spray arm, and water is discharged to both sides through the water inlet. The spray arm is driven to rotate by the viscous force of water dispersed in the flow channel. A first water spray hole is opened on the other side wall of the spray arm for spraying water. In the existing dishwasher, after the bowl rack structure is fixed, the position of the dishes on the bowl rack remains unchanged, and the water column sprayed by the spray arm is roughly in a straight line (strip) shape, which results in a limited range of the spray water column, and it is impossible to take into account the surface of all tableware, resulting in a cleaning dead angle, which affects the cleaning effect. At the same time, for dishwashers with a rectangular washing chamber, it is also easy to produce a cleaning dead angle.

[0004] The Chinese utility model patent "A dishwasher sprayer and dishwasher" (application number: CN201520047405.0) with authorization announcement number CN204445748U discloses a structure in which the sprayer includes a water storage cavity, a spray surface and a mounting surface. The spray surface is provided with a plurality of spray holes connected to the water storage cavity, the mounting surface is provided with a water inlet, a spray head is installed on the spray surface, the spray head is provided with at least two spray holes, the inside of the spray head has a water channel connected to the water storage cavity, and the spray hole is connected to the water channel. While the sprayer rotates and sprays, the spray head on the sprayer also sprays at the same time. Since the spray head has at least two spray holes, the effective spray area is increased and the spray dead angle is reduced.

[0005] The sprayer with the above structure is helpful to reduce the blind angle of cleaning. However, the water column sprayed by the nozzle has a partial energy loss, resulting in poor cleaning degree. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a cleaning machine which improves the cleaning effect by increasing the stripping force of the spray water column on pollutants in view of the current status of the prior art.

[0007] The technical solution adopted by the present invention to solve the above technical problems is:

[0008] A cleaning machine comprises a box body and a spray arm, wherein the spray arm is arranged in the box body, the interior of the spray arm is hollow to form a flow channel extending along the length direction, the top wall or the bottom wall of the spray arm is provided with a water inlet connected to the flow channel, and the top wall is provided with a plurality of water spray holes connected to the flow channel, the top wall of the spray arm is provided with a water outlet near the end, the water outlet is connected to a nozzle that can rotate relative to the spray arm, a first air-increasing structure that can enable the water spray hole to spray a cavitation water column is provided on the spray arm, and a second air-increasing structure that can enable the nozzle to spray a cavitation water column is provided on the top of the nozzle.

[0009] Preferably, the spray arm is covered with a top plate, and an air collecting chamber is enclosed between the top plate and the top wall of the spray arm, and the air collecting chamber is connected to the outside air. The top plate is provided with jet holes arranged corresponding to the water spray holes, and a first gap is formed between the jet holes and the water spray holes for air to be sucked into the jet water column in the jet state. The air collecting chamber, the jet holes and the first gap together constitute the first air supply structure. According to the Venturi effect, when the water column passes through the water spray hole and the jet hole, negative pressure is generated at the first gap, thereby sucking the air around it into the water column, forming a cavitation water column with bubbles. When the cavitation water column hits the surface of the object to be cleaned, the bubbles burst at the moment of bursting, which can increase the stripping force on the pollutants and improve the cleaning effect.

[0010] Preferably, a spray hole is provided at the top of the nozzle, a top cover is provided at the top of the nozzle, a spray hole corresponding to the spray hole is provided on the top cover, a second gap is formed between the spray hole and the spray hole for air to be sucked into the jet water column in the jet state, and the spray hole and the second gap together constitute the second air supply structure. Similarly, according to the Venturi effect, when the water column passes through the spray hole and the spray hole, negative pressure will be generated at the second gap, thereby sucking the air around it into the water column, forming a cavitation water column with bubbles, and when the cavitation water column hits the surface of the object to be cleaned, the bubbles burst at the moment, which can increase the stripping force on the pollutants and improve the cleaning effect.

[0011] Preferably, the nozzle is located within the coverage of the air collecting chamber, and the top plate is provided with an opening for the top cover to be exposed, and the opening constitutes the air inlet of the air collecting chamber. The above opening, on the one hand, exposes the top of the nozzle for the nozzle to spray water, and on the other hand, constitutes the air inlet of the air collecting chamber to simplify the overall structure of the spray arm.

[0012] More preferably, the upper surface of the top cover is provided with a guide structure for guiding the accumulated water thereon to the edge, and correspondingly, the top of the spray arm is provided with a guide cavity for receiving the accumulated water falling from the opening, the gas collecting cavity is provided with a blocking structure that can prevent the accumulated water in the guide cavity from flowing to the first gas filling structure, and the spray arm is provided with a drainage structure corresponding to the arrangement of the guide cavity and used to guide the accumulated water to the outside of the spray arm. With such a structure, the opening on the top plate takes into account the third function, that is, to drain the water on the surface of the top cover downward; at the same time, the blocking structure is used to prevent the accumulated water from flowing to the middle of the gas collecting cavity and affecting the air suction effect of the first gas filling structure; the drainage structure is used to guide the accumulated water to the outside of the spray arm to avoid water accumulation in the spray arm, so that the spray arm always runs without load, and maintains a high and stable rotation speed and jet effect.

[0013] In order to improve the flow guiding effect, the upper surface of the top cover gradually tilts downward from the center to the edge to form a flow guiding surface. The upper surface of the top cover is provided with a flow guiding groove extending from the center to the edge. The above structure can keep the upper surface of the top cover free of water or less water, so as to prevent water stains from being sucked into the second gap and affecting the aeration effect of the second aeration structure.

[0014] Preferably, a baffle is provided between the top wall and the top plate of the spray arm, arranged along the periphery of the nozzle and separating the main body and the end of the spray arm, the baffle constituting the blocking structure, and gaps are left at both ends of the baffle for gas to flow between the guide cavity and the gas collecting cavity. The baffle is in an arc shape, which, on the one hand, supports the top plate, and, on the other hand, is used to prevent accumulated water from entering the gas collecting cavity.

[0015] Preferably, a partition for closing the end of the flow channel is provided in the spray arm, the water outlet is opened on the partition, and the drainage structure is opened on the top wall and the bottom wall of the spray arm and allows the accumulated water in the diversion cavity to pass through and fall under the spray arm.

[0016] Preferably, the width of the partition gradually decreases along the water flow direction from the inner wall of the flow channel and is enclosed together with the bottom wall of the flow channel to form a diversion and pressurized flow channel. The height of the diversion and pressurized flow channel is less than the height of the spray arm flow channel. The water outlet is located at the end of the diversion and pressurized flow channel and extends upward from the edge to form a diversion sleeve. The bottom of the nozzle is provided with a water inlet sleeve that is plugged and rotatably matched with the diversion sleeve. Since the water outlet is provided at the end of the spray arm, when the motor power is low, there may be a problem of low water pressure. The diversion and pressurized flow channel is provided to pressurize the water entering the nozzle to improve the jet cleaning effect of the nozzle.

[0017] In order to facilitate assembly, a clamping ring is provided on the upper edge of the guide sleeve, and correspondingly, a clamping foot arranged around the periphery of the water inlet sleeve and capable of engaging with the clamping ring is provided on the bottom wall of the nozzle. This structure can constrain the nozzle in the spray arm to prevent it from detaching.

[0018] As an improvement, in the assembled state, an adjustment gap is formed between the outer circumferential wall of the guide sleeve and the inner circumferential wall of the water inlet sleeve to release water and pressure under high water pressure. Since the nozzle rotates driven by the viscosity of the water flow, when the motor power is high, the water pressure of the water flow entering the nozzle may be high, resulting in unstable rotation of the nozzle and affecting the jet effect. With the above structure, when the water pressure is high, the water flow will push the nozzle and its water inlet sleeve upward, and a small amount of water will be released upward and outward through the adjustment gap in the circumference of the water inlet sleeve, and the amount of water released will be automatically adjusted with the water pressure, so that while releasing water and pressure, the nozzle can maintain sufficient injection head and stable rotation speed.

[0019] Preferably, the outer peripheral wall of the water inlet sleeve is provided with convex ribs arranged along the circumferential direction so as to cooperate with the inner peripheral wall of the guide sleeve. The outer diameter of the convex ribs is smaller than the inner diameter of the guide sleeve, which can reduce the contact surface between the water inlet sleeve and the guide sleeve, reduce friction, and allow the drain water to be discharged.

[0020] Preferably, the inner peripheral wall of the guide sleeve is provided with a boss which can be arranged corresponding to the lower end surface of the water inlet sleeve, and in the assembled state, a gap is left between the lower end surface of the water inlet sleeve and the boss.

[0021] Preferably, the top wall of the spray arm is provided with a first opening for the water inlet sleeve and the clamping pin to pass through, and the bottom wall of the spray arm is provided with a second opening arranged around the partition plate and the periphery of the guide sleeve, and the second opening and the first opening together constitute the drainage structure. The structure can guide the accumulated water from top to bottom without interfering with the spray water flow.

[0022] Further preferably, the inner part of the first opening is arranged corresponding to the upper surface of the partition, the second opening is a C-shaped structure, the outer part of the first opening is arranged corresponding to the inner circle of the second opening, and the upper surface of the partition gradually tilts downward along the direction of the water flow in the diversion and pressurization flow channel to form a diversion slope for guiding the accumulated water falling from the inner part of the first opening to the second opening. This structure facilitates the rapid drainage of the accumulated water to the outside of the spray arm.

[0023] Preferably, the nozzle is disc-shaped, and a plurality of spray holes arranged at intervals along the circumference of the nozzle are provided on the top of the nozzle, and at least two spray holes face different directions.

[0024] Preferably, the spray arm is rotatably arranged in the box, and the nozzle is constrained on the spray arm through a rotating structure and can rotate with the spray arm and rotate relative to the spray arm. This structure is conducive to expanding the cleaning range, eliminating cleaning dead corners, and improving the cleaning effect.

[0025] Compared with the prior art, the advantages of the present invention are as follows: a nozzle that can rotate relative to the spray arm is arranged at the end of the spray arm of the present invention, and the water column sprayed by the nozzle cooperates with the water column sprayed by the water spray hole, which is conducive to spreading the cleaning range and eliminating cleaning dead corners, thereby improving the cleaning effect; the main part of the spray arm of the present invention forms a cavitation water column through the first gas-filling structure, and the nozzle forms a cavitation water column through the second gas-filling structure. At the moment when the cavitation water column contacts the pollutants, the bubbles entrained in the water flow burst, which can improve the stripping force of the pollutants on the surface of the object to be cleaned, and further improve the cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a cleaning machine according to an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of a spray arm according to an embodiment of the present invention;

[0028] Figure 3 for Figure 2 Schematic diagram of the bottom structure;

[0029] Figure 4 for Figure 2 Exploded diagram of

[0030] Figure 5 for Figure 4 A partial enlarged view of

[0031] Figure 6 for Figure 4 Schematic diagram of the bottom structure;

[0032] Figure 7 2 is a cross-sectional view of a spray arm according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below with reference to the accompanying drawings.

[0034] like Figures 1 to 7 As shown, the cleaning machine of this embodiment includes a box body 01 and a spray arm 1. A concave water return area 011 is provided at the bottom of the box body 01. The top of the water return area 011 is covered with a filter plate 012. A water pump connected to the water return area 011 is provided in the water return area 011. The water outlet of the water pump is arranged upward. The spray arm 1 can be rotatably provided on the filter plate 012 and is connected to the water outlet of the water pump.

[0035] The spray arm 1 is rotatably disposed in the box and arranged near the bottom of the box. The interior of the spray arm 1 is hollow to form a flow channel 11 extending along the length direction. The bottom wall of the spray arm 1 is provided with a water inlet 12 connected to the flow channel 11, and the top wall is provided with a plurality of water spray holes 13 connected to the flow channel 11. The bottom of the box is provided with a water pumping mechanism for pumping water at the bottom of the box into the flow channel 11 through the water inlet 12, that is, the above-mentioned water pump.

[0036] The top wall of the spray arm 1 of this embodiment is provided with a water outlet 14 near the end, and the water outlet 14 is connected to a nozzle 2 that can rotate relative to the spray arm 1. A first air-increasing structure that enables the water spray hole 13 to spray a cavitation water column is provided on the spray arm 1, and a second air-increasing structure that enables the nozzle 2 to spray a cavitation water column is provided on the top of the nozzle 2.

[0037] Specifically, the spray arm 1 is covered with a top plate 3, and a gas collecting chamber 30 is enclosed between the top plate 3 and the top wall of the spray arm 1. The gas collecting chamber 30 is connected to the outside air. The top plate 3 is provided with a jet hole 31 arranged corresponding to the water spray hole 13. A first gap 100 is formed between the jet hole 31 and the water spray hole 13, which can allow air to be sucked into the jet water column in the jet state. The gas collecting chamber 30, the jet hole 31 and the first gap 100 together constitute a first gas-filling structure. According to the Venturi effect, when the water column passes through the water spray hole 13 and the jet hole 31, a negative pressure is generated at the first gap 100, thereby sucking the air around it into the water column, forming a cavitation water column with bubbles. A spray hole 21 is provided at the top of the nozzle 2, and a top cover 22 is provided at the top of the nozzle 2 at intervals. A spray hole 221 corresponding to the spray hole 21 is provided on the top cover 22. A second gap 200 is formed between the spray hole 221 and the spray hole 21, which can allow air to be sucked into the jet water column in the jet state. The gap between the top cover 22 and the edge of the top wall of the nozzle 2 is the air intake gap. The spray hole 221 and the second gap 200 together constitute a second air supply structure. Similarly, according to the Venturi effect, when the water column passes through the spray hole 21 and the spray hole 221, a negative pressure will be generated at the second gap 200, thereby sucking the air around it into the water column, forming a cavitation water column with bubbles. When the cavitation water column hits the surface of the object to be cleaned, the bubble bursts at the moment, which can increase the stripping force on the pollutants and improve the cleaning effect.

[0038] The nozzle 2 of this embodiment is located within the coverage of the gas collecting chamber 30, and the top plate 3 is provided with an opening 32 for the top cover 22 to be exposed, and the opening 32 constitutes the air inlet of the gas collecting chamber 30. The upper surface of the top cover 22 is provided with a guide structure for guiding the accumulated water thereon to the edge, and correspondingly, the top of the spray arm 1 is provided with a guide cavity 15 for receiving the accumulated water falling from the opening 32, and the gas collecting chamber 30 is provided with a blocking structure that can prevent the accumulated water in the guide cavity 15 from flowing to the first gas filling structure, and the spray arm 1 is provided with a drainage structure arranged corresponding to the guide cavity 15 and used to guide the accumulated water to the outside of the spray arm 1. On the one hand, the opening 32 exposes the top of the nozzle 2 for the nozzle 2 to spray water, and on the other hand, it constitutes the air inlet of the air collecting chamber to simplify the overall structure of the spray arm. The opening 32 on the top plate 3 also takes into account the third function, which is to drain the water on the surface of the top cover 22 downward. The present embodiment utilizes a blocking structure to prevent the accumulated water from flowing to the middle of the air collecting chamber 30 and affecting the air suction effect of the first air filling structure. The drainage structure is used to guide the accumulated water to the outside of the spray arm 1 to avoid water accumulation in the spray arm 1, so that the spray arm 1 always runs without load and maintains a relatively high and stable rotation speed and jet effect.

[0039] In order to improve the diversion effect, the upper surface of the top cover 22 gradually tilts downward from the center to the edge to form a diversion surface 222. A diversion groove 223 extending from the center to the edge is provided on the upper surface of the top cover 22. The diversion surface 222 and the diversion groove 223 can be provided selectively or simultaneously, and this structure can keep the upper surface of the top cover 22 free of water or less water, so as to prevent water stains from being sucked into the second gap 200 and affecting the aeration effect of the second aeration structure.

[0040] A baffle 33 is arranged along the periphery of the nozzle 2 and separates the main part and the end of the spray arm 1 between the top wall of the spray arm 1 and the top plate 3, and the baffle 33 constitutes the above-mentioned blocking structure. The baffle 33 is in an arc shape, and gaps 331 are left at both ends of the baffle 33 for gas to flow between the guide cavity 15 and the gas collecting cavity 30. The baffle 33 plays a role in supporting the top plate 3 on the one hand, and is used to prevent accumulated water from entering the gas collecting cavity 30 on the other hand.

[0041] The spray arm 1 of this embodiment is provided with a partition 16 for closing the end of the flow channel 11, the water outlet 14 is opened on the partition 16, and the drainage structure is opened on the top wall and the bottom wall of the spray arm 1 and allows the accumulated water in the diversion cavity 15 to pass through and fall under the spray arm 1.

[0042] The width of the partition 16 gradually decreases along the water flow direction from the inner wall of the flow channel 11 and is enclosed together with the bottom wall of the flow channel 11 to form a diversion and pressurization flow channel 161. The height of the diversion and pressurization flow channel 161 is less than the height of the flow channel 11 of the spray arm 1. The water outlet 14 is located at the end of the diversion and pressurization flow channel 161 and extends upward from the edge to form a diversion sleeve 141. The bottom of the nozzle 2 is provided with a water inlet sleeve 24 that is plugged and rotatably matched with the diversion sleeve 141. Since the water outlet 14 is provided at the end of the spray arm 1, when the motor power is low, there may be a problem of low water pressure. The diversion and pressurization flow channel 161 is provided to pressurize the water entering the nozzle 2 to improve the jet cleaning effect of the nozzle.

[0043] For easy assembly, a collar 142 is provided on the upper edge of the guide sleeve 141, and correspondingly, a clamping foot 25 is provided on the bottom wall of the nozzle 2, which is arranged around the periphery of the water inlet sleeve 24 and can be engaged with the collar 142. This structure can constrain the nozzle 2 in the spray arm 1 to prevent it from being separated.

[0044] In the assembled state, an adjustment gap 140 is formed between the outer peripheral wall of the guide sleeve 141 and the inner peripheral wall of the water inlet sleeve 24, which can release water and pressure under high water pressure. Since the nozzle 2 rotates driven by the viscosity of the water flow, when the motor power is high, the water pressure of the water flow entering the nozzle 2 may be high, resulting in unstable rotation of the nozzle 2 and affecting the jet effect. With the above structure, when the water pressure is high, the water flow will push the nozzle 2 and its water inlet sleeve 24 upward, and a small amount of water will be released upward and outward through the adjustment gap 140 on the circumference of the water inlet sleeve 24, and the amount of water released will be automatically adjusted with the water pressure, so that while releasing water and pressure, the nozzle 2 is maintained to have sufficient injection head and a stable rotation speed.

[0045] The outer peripheral wall of the water inlet sleeve 24 is provided with convex ribs 241 arranged along the circumferential direction so as to guide and cooperate with the inner peripheral wall of the guide sleeve 141. The outer diameter of the convex ribs 241 is smaller than the inner diameter of the guide sleeve 141, which can reduce the contact surface between the water inlet sleeve 24 and the guide sleeve 141, reduce friction, and allow the drain water to be discharged.

[0046] The inner circumferential wall of the guide sleeve 141 is provided with a boss 143 which can be arranged corresponding to the lower end surface of the water inlet sleeve 24 . In the assembled state, a gap is left between the lower end surface of the water inlet sleeve 24 and the boss 143 .

[0047] The top wall of the spray arm 1 of this embodiment is provided with a first opening 17 for the water inlet sleeve 24 and the clamping foot 25 to pass through, and the bottom wall of the spray arm 1 is provided with a second opening 18 arranged around the partition plate 16 and the outer periphery of the guide sleeve 141, and the second opening 18 and the first opening 17 together form a drainage structure. This structure can guide the accumulated water from top to bottom without interfering with the spray water flow.

[0048] The inner part of the first opening 17 is arranged corresponding to the upper surface of the partition 16, the second opening 18 is a C-shaped structure, the outer part of the first opening 17 is arranged corresponding to the inner circle of the second opening 18, and the upper surface of the partition 16 gradually tilts downward along the direction of the water flow in the diversion and pressurized flow channel 161 to form a diversion slope 162 for guiding the accumulated water falling from the inner part of the first opening 17 to the second opening 18. This structure facilitates the rapid drainage of the accumulated water to the outside of the spray arm 1.

[0049] The nozzle 2 is in the shape of a disk, and a hollow flow channel is arranged inside. The top of the nozzle 2 is provided with a plurality of spray holes 21 arranged at intervals along the circumference thereof, and at least two spray holes 21 face different directions. The spray arm 1 is rotatably arranged in the box, and the nozzle 2 is constrained on the spray arm 1 by a rotating structure and can rotate with the spray arm 1 and rotate relative to the spray arm 1 at the same time. The rotation of the nozzle 2 is achieved by the tilted spray holes 21 driven by the viscosity of the water flow. This structure is conducive to expanding the cleaning range, eliminating cleaning dead corners, and improving the cleaning effect.

[0050] In this embodiment, a nozzle 2 that can rotate relative to the spray arm 1 is provided at the end of the spray arm 1. The water column sprayed by the nozzle 2 cooperates with the water column sprayed by the water spray hole 13, which is conducive to spreading the cleaning range and eliminating cleaning dead corners, thereby improving the cleaning effect; the main part of the spray arm 1 forms a cavitation water column through the first gas filling structure, and the nozzle 2 forms a cavitation water column through the second gas filling structure. At the moment the cavitation water column contacts the pollutants, the bubbles entrained in the water flow burst, which can improve the stripping force of the pollutants on the surface of the object to be cleaned, and further improve the cleaning effect.

[0051] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. A cleaning machine, comprising a housing (01) and a spray arm (1), wherein the spray arm (1) is arranged in the housing (01), the interior of the spray arm (1) is hollow to form a flow channel (11) extending in the length direction, the top wall or the bottom wall of the spray arm (1) is provided with a water inlet (12) connected to the flow channel (11), and the top wall is provided with a plurality of water spray holes (13) connected to the flow channel (11), characterized in that: The top wall of the spray arm (1) is provided with a water outlet (14) near the end, the water outlet (14) is connected to a nozzle (2) that can rotate relative to the spray arm (1), the spray arm (1) is provided with a first air-injection structure that enables the water spray hole (13) to spray a cavitation water column, and the top of the nozzle (2) is provided with a second air-injection structure that enables the nozzle (2) to spray a cavitation water column; The spray arm (1) is covered with a top plate (3), and a gas collecting chamber (30) is enclosed between the top plate (3) and the top wall of the spray arm (1). The nozzle (2) is located within the coverage of the gas collecting chamber (30). The top plate (3) is provided with an opening (32) for exposing the top cover (22), and the opening (32) constitutes an air inlet of the gas collecting chamber (30); a guide for receiving accumulated water falling from the opening (32) is arranged on the top of the spray arm (1). The spray arm (1) is provided with a drainage structure corresponding to the diversion cavity (15) and used for guiding the accumulated water to the outside of the spray arm (1); the spray arm (1) is provided with a partition (16) for closing the end of the flow channel (11); the water outlet (14) is provided on the partition (16); the drainage structure is provided on the top wall and the bottom wall of the spray arm (1) and allows the accumulated water in the diversion cavity (15) to pass through and fall below the spray arm (1).

2. The cleaning machine according to claim 1, characterized in that: The air collecting chamber (30) is in communication with the outside air. The top plate (3) is provided with jet holes (31) arranged corresponding to the water spray holes (13). A first gap (100) is formed between the jet holes (31) and the water spray holes (13) so as to allow air to be sucked into the jet water column in a jet state. The air collecting chamber (30), the jet holes (31) and the first gap (100) together constitute the first air supply structure.

3. The cleaning machine according to claim 2, characterized in that: The top of the nozzle (2) is provided with a spray hole (21), the top of the nozzle (2) is provided with a top cover (22), the top cover (22) is provided with a spray hole (221) arranged corresponding to the spray hole (21), a second gap (200) is formed between the spray hole (221) and the spray hole (21) for allowing air to be sucked into the jet water column in a jet state, and the spray hole (221) and the second gap (200) together constitute the second air supply structure.

4. The cleaning machine according to claim 3, characterized in that: The upper surface of the top cover (22) is provided with a guide structure for guiding the accumulated water thereon to the edge.

5. The cleaning machine according to claim 4, characterized in that: The gas collecting cavity (30) is provided with a blocking structure capable of preventing the accumulated water in the flow guiding cavity (15) from flowing toward the first gas filling structure.

6. The cleaning machine according to claim 4, characterized in that: The flow guiding structure comprises a flow guiding surface (222) which is arranged on the upper surface of the top cover (22) and gradually slopes downward from the center to the edge.

7. The cleaning machine according to claim 4, characterized in that: The flow guiding structure comprises a flow guiding groove (223) which is arranged on the upper surface of the top cover (22) and extends from the center to the edge.

8. The cleaning machine according to claim 5, characterized in that: A baffle (33) is provided between the top wall of the spray arm (1) and the top plate (3), which is arranged along the periphery of the nozzle (2) and separates the main part and the end of the spray arm (1). The baffle (33) constitutes the blocking structure. Gaps (331) are left at both ends of the baffle (33) for gas to flow between the guide cavity (15) and the gas collecting cavity (30).

9. The cleaning machine according to claim 5, characterized in that: The width of the partition (16) gradually decreases along the water flow direction from the inner wall of the flow channel (11) and is enclosed together with the bottom wall of the flow channel (11) to form a diversion and pressurization flow channel (161); the height of the diversion and pressurization flow channel (161) is less than the height of the flow channel (11) of the spray arm (1); the water outlet (14) is located at the end of the diversion and pressurization flow channel (161) and extends upward from the edge to form a diversion sleeve (141); and the bottom of the nozzle (2) is provided with a water inlet sleeve (24) which is plugged and rotatably matched with the diversion sleeve (141).

10. The cleaning machine according to claim 9, characterized in that: The upper edge of the guide sleeve (141) is provided with a clamping ring (142), and correspondingly, the bottom wall of the nozzle (2) is provided with a clamping foot (25) which is arranged around the periphery of the water inlet sleeve (24) and can be clamped and matched with the clamping ring (142).

11. The cleaning machine according to claim 10, characterized in that: In the assembled state, an adjustment gap (140) is formed between the outer peripheral wall of the guide sleeve (141) and the inner peripheral wall of the water inlet sleeve (24) to allow water and pressure to be released under high water pressure.

12. The cleaning machine according to claim 11, characterized in that: The outer peripheral wall of the water inlet sleeve (24) is provided with convex ribs (241) arranged in the circumferential direction so as to cooperate with the inner peripheral wall of the guide sleeve (141) in a guiding manner.

13. The cleaning machine according to claim 10, characterized in that: The inner peripheral wall of the guide sleeve (141) is provided with a boss (143) arranged corresponding to the lower end surface of the water inlet sleeve (24); in the assembled state, a gap is left between the lower end surface of the water inlet sleeve (24) and the boss (143).

14. The cleaning machine according to claim 9, characterized in that: The top wall of the spray arm (1) is provided with a first opening (17) for the water inlet sleeve (24) and the clamping foot (25) to pass through, and the bottom wall of the spray arm (1) is provided with a second opening (18) arranged around the partition plate (16) and the periphery of the guide sleeve (141), and the second opening (18) and the first opening (17) together constitute the drainage structure.

15. The cleaning machine according to claim 14, characterized in that: The inner part of the first opening (17) is arranged corresponding to the upper surface of the partition (16); the second opening (18) is a C-shaped structure; the outer part of the first opening (17) is arranged corresponding to the inner circle of the second opening (18); the upper surface of the partition (16) gradually tilts downward along the direction of the water flow in the diversion and pressurization channel (161) to form a diversion slope (162) for guiding the accumulated water falling from the inner part of the first opening (17) to the second opening (18).

16. The cleaning machine according to any one of claims 1 to 15, characterized in that: The nozzle (2) is disc-shaped, and a plurality of spray holes (21) are arranged at intervals along the circumference of the nozzle (2), and at least two of the spray holes (21) are oriented in different directions.

17. The cleaning machine according to any one of claims 1 to 15, characterized in that: The spray arm (1) is rotatably arranged in the box (01); the nozzle (2) is constrained on the spray arm (1) by a rotating structure and can rotate with the spray arm (1) and simultaneously rotate relative to the spray arm (1).

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