A spray arm and a cleaning machine using the spray arm

Abstract

The present invention relates to a spray arm, comprising a spray arm body, a first water spray hole is arranged on the spray arm body, and a nozzle can suck gas and mix it with water flow when the first water spray hole sprays water, a gas collecting chamber connected to a gas source is arranged on the side wall of the spray arm body, the nozzle is sleeved in the first water spray hole, and a suction hole is opened on the side wall for gas in the gas collecting chamber to enter the nozzle. The present invention allows bubbles to be entrained in the sprayed water flow, and when the water flow with bubbles is sprayed toward dishes, the bubbles in the water flow contact the dishes and break and generate a large impact force, thereby dispersing the stubborn dirt on the dishes or fruits and vegetables, and achieving a better cleaning effect; at the same time, since the water flow speed is not constant with the rotation of the spray arm, this makes the amount of gas sucked into the nozzle not constant, so that the water-gas mixture is reflected in the effect of discontinuous spraying, further increasing the stripping force on the dirt and improving the cleaning effect.

Description

Technical Field

[0001] The invention relates to a spray arm and a cleaning machine using the spray arm. Background Art

[0002] As people's living standards continue to improve, dishwashers, as a kitchen appliance, are increasingly entering households. Currently, dishwashers on the market are generally divided into three types: desktop, cabinet, and tank. Among them, desktop dishwashers are integrated independent structures and are generally placed on the table for use; cabinet dishwashers are also independent structures, but need to be embedded in kitchen cabinets for use; tank dishwashers are combined with sinks and are generally installed in kitchen cabinets for use.

[0003] The various forms of dishwashers mentioned above generally use a water pump to lift water and spray it onto the dishes in the cleaning space to achieve the cleaning effect. For example, Chinese patents with application number CN97236119.7 "Microcomputer light-controlled fully automatic dishwasher" and Chinese patents with application number CN00240098.7 "A dishwasher" both disclose similar structures. In such structures, the impact force of the water flow sprayed onto the dishes is weak and not uniform. When there are many dishes, they cannot be covered by the water flow, resulting in poor cleaning effect. Chinese patents with application number CN200710306898.5 "Dishwasher with a device for improving the decontamination effect, especially a household dishwasher" are provided with a vaporization device for generating a fluid mist that can be introduced into the dishwasher cavity to expand the cleaning area sprayed onto the dishes and improve the uniformity of the cleaning medium. However, such structures still cannot solve the problem of weak impact force of the sprayed water flow. The Chinese patent "A Large Ultrasonic Automatic Dishwasher" with application number 201610795828.X is equipped with an ultrasonic transmitter device, and simultaneously inputs high-pressure air into the cleaning liquid. The ultrasonic transmitter device is used to form bubbles in the cleaning liquid with the input high-pressure air. The ultrasonic transducer is used to provide energy to the cleaning liquid, so that the bubbles in the cleaning liquid burst and generate impact force, thereby increasing the impact force of the water flow. However, in this type of structure, the instantaneous air explosion phenomenon generated between the ultrasonic wave and the high-pressure bubbles needs to be maintained in water. When the water flow is lifted by the water pump and circulated and sprayed out, the high-pressure bubbles are difficult to reach the surface of the dishes and burst, and cannot be applied to the water jet dishwasher structure. In addition, this type of structure is only suitable for large dishwashers and is difficult to be applied to household dishwashers. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a spray arm of a cleaning machine which can form bubbles in a water flow to increase the impact strength on the object to be cleaned and improve the cleaning effect in view of the current status of the prior art.

[0005] Another technical problem to be solved by the present invention is to provide a cleaning machine with the above-mentioned spray arm in view of the current status of the prior art, which can form bubbles in the water flow, thereby increasing the impact strength on the object to be cleaned and thus improving the cleaning effect.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a spray arm, including a spray arm body, on which a first water spray hole is arranged, and is characterized in that: it also includes a nozzle that can suck in gas and mix it with water flow when the first water spray hole is spraying water, and an air collecting chamber connected to an air source is arranged on the side wall of the spray arm body, and the nozzle is arranged in the first water spray hole and an air suction hole is opened on the side wall for the gas in the air collecting chamber to enter the nozzle.

[0007] In the above scheme, the first water spray hole includes a first part located on the side wall of the spray arm body and a second part located on the outer side wall of the gas collecting chamber, the first part and the second part are arranged opposite to each other and a gap connected to the gas collecting chamber is formed between the two parts, the nozzle has a first plug-in part that can be inserted into the first part and a second plug-in part that can be inserted into the second part, the air suction hole is opened between the first plug-in part and the second plug-in part and the inlet is arranged corresponding to the above gap. With such a structure, the air suction hole on the nozzle is connected to the gas collecting chamber.

[0008] Preferably, the inner diameter of the second part is greater than the inner diameter of the first part, and a step arranged along the circumferential direction is formed at the junction of the first part and the second part.

[0009] Preferably, the air suction hole is arranged along the axial direction of the nozzle and the outlet is located on the end surface of the step, and the outer peripheral wall of the nozzle is recessed radially inward to form the inlet of the air suction hole. With such a structure, water flow can be prevented from entering the gas collecting chamber, and the gas in the gas collecting chamber is sucked into the nozzle under the negative pressure generated by the water flow.

[0010] As an improvement, a guide sleeve is placed inside the second part of the first water spray hole, the lower end of the guide sleeve abuts against the end face of the step, and the lower end face of the guide sleeve forms an arc surface that gradually transitions upward smoothly from the outside to the inside in the radial direction. The upper edge of the arc surface is tangent to the inner wall surface of the guide sleeve at the connection. The provision of the guide sleeve can reduce the inner diameter of the second part to a certain extent, increase the water flow speed, and make the lower end of the guide sleeve transition smoothly to facilitate the introduction of airflow, so as to better mix with the water flow.

[0011] In the above solutions, the nozzle is inserted into the first water spray hole in a detachable manner. Such a structure is convenient for production and assembly.

[0012] In order to facilitate connection, the inner wall of the second part of the first water spray hole is provided with a concave ring arranged along the circumferential direction, and correspondingly, a convex ring that can cooperate and engage with the concave ring is formed on the outer peripheral wall of the nozzle.

[0013] Preferably, a first groove arranged along the circumferential direction is formed on the outer peripheral wall of the upper part of the nozzle, and a first sealing ring capable of abutting against the inner wall of the second part of the first water spray hole is arranged in the first groove. A second groove arranged along the circumferential direction is formed on the outer peripheral wall of the lower part of the nozzle, and a second sealing ring capable of abutting against the inner wall of the first part of the first water spray hole is arranged in the second groove. This structure can prevent water flow from entering the gas collecting chamber.

[0014] In the above solutions, the spray arm is further provided with a second spray hole located outside the gas collecting chamber. The second spray hole is not connected to the gas collecting chamber, is an existing common spray hole, and can cooperate with the first spray hole to improve the cleaning effect.

[0015] A cleaning machine using the above-mentioned spray arm comprises a housing, the spray arm and a driving mechanism for driving the spray arm to rotate, the housing having a washing chamber, the spray arm being rotatably arranged in the housing, the spray arm being hollow inside to form a water collecting chamber, a water inlet connected to the water collecting chamber being provided on the side wall of the spray arm, the driving mechanism comprising a motor and an impeller, the upper part of the impeller being rotatably arranged in the water collecting chamber, the lower part of the impeller passing through the water inlet and being located outside the spray arm, the motor being arranged outside the housing and the motor shaft passing through the housing to be connected to the impeller, characterized in that: the motor shaft is hollow inside, the first end of the motor shaft is an air inlet end arranged outside the housing, and the second end of the motor shaft is an air outlet end connected to the air collecting chamber.

[0016] The cleaning machine also includes an air supply structure that can provide an air source for the air collecting chamber. The air supply structure includes an air pump and an air duct. The air pump is arranged outside the box body, the air inlet end of the air duct is connected to the air pump, and the air outlet end of the air duct is connected to the air inlet end of the motor shaft.

[0017] Compared with the prior art, the advantages of the present invention are: an air collecting chamber is arranged on the side wall of the spray arm body, and a nozzle is arranged on the first water spray hole, which can suck the gas in the air collecting chamber and mix it with the water flow in the water spraying state, so that bubbles are entrained in the sprayed water flow. When the water flow mixed with bubbles is sprayed toward the dishes, the bubbles in the water flow contact the dishes and burst and generate a large impact force, thereby dispersing the stubborn dirt on the dishes or vegetables and fruits, and achieving a better cleaning effect; at the same time, because the water flow speed is not constant with the rotation of the spray arm, the amount of gas sucked into the nozzle is not constant, so that the water-gas mixture is manifested as a discontinuous spraying effect, which further increases the stripping force on the dirt and improves the cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the installation structure of the cleaning machine in the embodiment of the present invention;

[0019] Figure 2 for Figure 1 Schematic diagram of some structures;

[0020] Figure 3 for Figure 2 A cross-sectional view of

[0021] Figure 4 A schematic diagram of the structure of a nozzle in an embodiment of the present invention;

[0022] Figure 5 It is a schematic diagram of the assembly structure of the nozzle and the spray arm body in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below with reference to the accompanying drawings.

[0024] like Figures 1 to 5 As shown, the spray arm of this embodiment includes a spray arm body 1 and a nozzle 2. The spray arm body 1 is hollow inside to form a water storage chamber 11. The upper wall of the spray arm body 1 is provided with a first spray hole 12 and a second spray hole 13 connected to the water storage chamber 11. The lower wall of the spray arm body 1 is provided with a water inlet 14 connected to the water storage chamber 11. A gas collecting chamber 15 connected to the gas source is provided on the side wall of the spray arm body 1. The nozzle 2 is sleeved in the first spray hole 12. The side wall of the nozzle 2 is provided with an air suction hole 21 for the gas in the gas collecting chamber 15 to enter the nozzle 2, so that the first spray hole 12 in the water spraying state sucks the gas due to negative pressure and mixes with the water flow, thereby causing bubbles to be entrained in the sprayed water flow. The second spray hole 13 is located at the periphery of the gas collecting chamber 15. The second spray hole 13 is not connected to the gas collecting chamber 15. It is an existing common spray hole, which can cooperate with the first spray hole 12 to improve the cleaning effect.

[0025] The first water spray hole 12 of this embodiment includes a first portion 121 located on the side wall of the spray arm body 1 and a second portion 122 located on the outer side wall of the gas collecting chamber 15. The first portion 121 and the second portion 122 are arranged oppositely and coaxially. A gap 123 communicating with the gas collecting chamber 15 is formed between the first portion 121 and the second portion 122. The nozzle 2 has a first plug-in portion 22 that can be inserted into the first portion 121 and a second plug-in portion 23 that can be inserted into the second portion 122. The air suction hole 21 is opened between the first plug-in portion 22 and the second plug-in portion 23, and the inlet 211 is arranged corresponding to the above gap 123, so that the air suction hole 21 on the nozzle 2 is connected to the gas collecting chamber 15. The inner diameter of the second portion 122 is greater than the inner diameter of the first portion 121, and a step 124 arranged along the circumferential direction is formed at the junction of the first portion 121 and the second portion 122. The air suction hole 21 is arranged along the axial direction of the nozzle 2 and the outlet 212 is located on the end surface of the step 124. The outer peripheral wall of the nozzle 2 is recessed radially inward to form the inlet 211 of the air suction hole 21. There are multiple air suction holes 21 and they are arranged at intervals along the circumference of the nozzle 2. The above structure can prevent water flow from entering the gas collecting chamber 15 and make the gas in the gas collecting chamber 15 be sucked into the nozzle 2 under the negative pressure generated by the water flow.

[0026] The second part 122 of the first water spray hole 12 of this embodiment is sleeved with a guide sleeve 125, the lower end of the guide sleeve 125 is against the end face of the step 124, and the lower end face of the guide sleeve 125 is formed with a camber 1251 that gradually transitions upward smoothly from the outside to the inside in the radial direction. The upper edge of the camber 1251 is tangent to the inner wall of the guide sleeve 125 at the connection. The guide sleeve 125 can reduce the inner diameter of the second part 122 to a certain extent, increase the water flow speed, and make the lower end of the guide sleeve 125 smoothly transition to facilitate the introduction of airflow, so as to better mix with the water flow.

[0027] The nozzle 2 of this embodiment is detachably inserted into the first water spray hole 12 to facilitate production and assembly. In order to facilitate connection, the inner wall of the second part 122 of the first water spray hole 12 is provided with a concave ring 1221 arranged along the circumferential direction, and correspondingly, a convex ring 24 that can be matched and engaged with the concave ring 1221 is formed on the outer peripheral wall of the nozzle 2. A first groove 25 arranged along the circumferential direction is formed on the outer peripheral wall of the upper part of the nozzle 2, and a first sealing ring 26 that can abut against the inner wall of the second part 122 of the first water spray hole 12 is arranged in the first groove 25. A second groove 27 arranged along the circumferential direction is formed on the outer peripheral wall of the lower part of the nozzle 2, and a second sealing ring 28 that can abut against the inner wall of the first part 121 of the first water spray hole 12 is arranged in the second groove 27. This structure can prevent water from entering the air collecting chamber 15.

[0028] In this embodiment, the cleaning machine using the above-mentioned spray arm comprises a housing 3, a spray arm body 1 and a driving mechanism 4 for driving the spray arm body 1 to rotate. The housing 3 has a washing chamber and is installed on a cabinet countertop 100. The spray arm body 1 is rotatably arranged in the housing 3. The interior of the spray arm body 1 is hollow to form a water collecting chamber 10. A water inlet 14 connected to the water collecting chamber 10 is opened on the side wall of the spray arm body 1. The driving mechanism 4 comprises a motor 41 and an impeller 42. The upper part of the impeller 42 is rotatably arranged in the water collecting chamber 10. The lower part of the impeller 42 passes through the water inlet 16 and is located outside the spray arm body 1. The motor 41 is arranged outside the housing 1 and the motor shaft 411 passes through the housing 1 and is connected to the impeller 42. The motor shaft 411 is hollow inside, the first end of the motor shaft 411 is an air inlet end arranged outside the housing 1, and the second end of the motor shaft 411 is an air outlet end connected to the air collecting chamber 15. The cleaning machine also includes an air filling structure 5 that can provide an air source for the air collecting chamber 15. The air filling structure 5 includes an air pump 51 and an air guide pipe 52. The air pump 51 is arranged on the outside of the box body 1. The air inlet end of the air guide pipe 52 is connected to the air pump 51, and the air outlet end of the air guide pipe 52 is connected to the air inlet end of the motor shaft 411.

[0029] In this embodiment, an air collecting chamber 15 is arranged on the side wall of the spray arm body 1, and a nozzle 2 is arranged on the first water spray hole 12, which can absorb the gas in the air collecting chamber 15 and mix it with the water flow in the water spraying state. When the water flows through the nozzle 2, negative pressure is generated on the upper part of the nozzle, so that the gas is sucked from the air collecting chamber 15 into the nozzle 2 through the suction hole 21, so that the sprayed water flow is entrained with bubbles. When the water flow with bubbles is sprayed toward the dishes, the bubbles in the water flow contact the dishes and burst and generate a large impact force, so that the stubborn particles on the dishes or fruits and vegetables are removed. Solid dirt is dispersed to achieve a better cleaning effect; at the same time, since the water flow speed is not constant as the spray arm rotates, the amount of gas sucked into the nozzle 2 is not constant, so that the water-gas mixture is manifested as a discontinuous spraying effect, further increasing the stripping force on dirt and improving the cleaning effect; in addition, since the gas source of this embodiment is supplied by the gas collecting chamber 15, when the spray arm body 1 is immersed in water as a whole, the gas can also be sucked into the nozzle 2, thereby enhancing the turbulence of the water flow and improving the cleaning effect.

Claims

1. A spray arm, comprising a spray arm body (1), wherein the spray arm body (1) is provided with a first water spray hole (12), characterized in that: It also comprises a nozzle (2) capable of sucking in gas and mixing it with water flow when the first water spray hole (12) is spraying water, a gas collecting chamber (15) connected to a gas source is arranged on the side wall of the spray arm body (1), the nozzle (2) is sleeved in the first water spray hole (12) and has an air suction hole (21) on the side wall for the gas in the gas collecting chamber (15) to enter the nozzle (2); The first water spray hole (12) comprises a first part (121) located on the side wall of the spray arm body (1) and a second part (122) located on the outer side wall of the air collecting chamber (15); the first part (121) and the second part (122) are arranged opposite to each other and a gap (123) connected to the air collecting chamber (15) is formed between the first part (121) and the second part (122); the nozzle (2) comprises a first plug-in portion (22) which can be inserted into the first part (121) and a second plug-in portion (23) which can be inserted into the second part (122); the air suction hole (21) is provided between the first plug-in portion (22) and the second plug-in portion (23) and the inlet (211) is arranged corresponding to the gap (123); The inner diameter of the second part (122) is greater than the inner diameter of the first part (121), and a step (124) arranged along the circumferential direction is formed at the connection between the first part (121) and the second part (122), the air intake hole (21) is arranged along the axial direction of the nozzle (2), and the outlet (212) is located on the end surface of the above-mentioned step (124).

2. The spray arm according to claim 1, characterized in that: A guide sleeve (125) is sleeved in the second portion (122) of the first water spray hole (12), the lower end of the guide sleeve (125) abuts against the end surface of the step (124), and the lower end surface of the guide sleeve (125) is formed with an arc surface (1251) that gradually and smoothly transitions upward from the outside to the inside in the radial direction.

3. The spray arm according to claim 2, characterized in that: The outer peripheral wall of the nozzle (2) is recessed radially inward to form an inlet (212) of the air suction hole (21).

4. The spray arm according to claim 2, characterized in that: The upper edge of the arc surface (1251) is tangent to the inner wall surface of the guide sleeve (125) at the connection point.

5. The spray arm according to any one of claims 1 to 4, characterized in that: The nozzle (2) is detachably inserted into the first water spray hole (12).

6. The spray arm according to claim 5, characterized in that: The inner wall of the second part (122) of the first water spray hole (12) is provided with a concave ring (1221) arranged along the circumferential direction, and correspondingly, the outer circumferential wall of the nozzle (2) is provided with a convex ring (24) which can be matched and engaged with the concave ring (1221).

7. The spray arm according to claim 6, characterized in that: A first groove (25) arranged along the circumferential direction is formed on the outer peripheral wall of the upper portion of the nozzle (2), and a first sealing ring (26) capable of abutting against the inner wall of the second portion (122) of the first water spray hole (12) is arranged in the first groove (25).

8. The spray arm according to claim 6, characterized in that: A second groove (27) arranged along the circumferential direction is formed on the outer peripheral wall of the lower part of the nozzle (2), and a second sealing ring (28) capable of abutting against the inner wall of the first part (121) of the first water spray hole (12) is arranged in the second groove (27).

9. The spray arm according to any one of claims 1 to 4, characterized in that: The spray arm body (1) is also provided with a second water spray hole (13) located at the periphery of the air collecting chamber (15).

10. A cleaning machine using the spray arm according to any one of claims 1 to 9, comprising a housing (3), the spray arm and a driving mechanism (4) for driving the spray arm to rotate, the housing (3) having a washing chamber, the spray arm being rotatably arranged in the housing (3), the interior of the spray arm being hollow to form a water collecting chamber (10), a water inlet (16) connected to the water collecting chamber (10) being formed on a side wall of the spray arm, the driving mechanism (4) comprising a motor (41) and an impeller (42), the upper part of the impeller (42) being rotatably arranged in the water collecting chamber (10), the lower part of the impeller (42) passing through the water inlet (16) and being located outside the spray arm, the motor (41) being arranged outside the housing (3) and the motor shaft (411) passing through the housing (3) and being connected to the impeller (42), characterized in that: The motor shaft (411) is hollow inside, the first end of the motor shaft (411) is an air inlet end arranged outside the box body (3), and the second end of the motor shaft (411) is an air outlet end connected to the air collecting chamber (15).

11. The spray arm according to claim 10, characterized in that: It also includes an air supply structure (5) capable of providing an air source for the air collecting chamber (15), wherein the air supply structure (5) includes an air pump (51) and an air guide pipe (52), wherein the air pump (51) is arranged outside the box body (3), the air inlet end of the air guide pipe (52) is connected to the air pump (51), and the air outlet end of the air guide pipe (52) is connected to the air inlet end of the motor shaft (411).

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