Spray arm for a dishwasher and dishwasher

Abstract

The utility model relates to a kind of spray arm and cleaning machine for cleaning machine, spray arm includes the body extending along length direction, the body is equipped with water inlet, first spray hole, the body is formed with internal hollow flow channel, and the flow channel is separated into at least two branch flow channels that can extend in the same direction, each branch flow channel is communicated with at least one first spray hole, in operating condition, each branch flow channel is supplied with water simultaneously and respectively sprays water column through corresponding first spray hole.The utility model separates flow channel into at least two branch flow channels that can extend in the same direction, so that the number of first spray hole supplied by independent flow channel is reduced, so that the jet flow of each spray hole is more stable, greater lift is obtained under the condition that water inflow is unchanged, and the spray coverage of spray jet is improved.

Description

Technical Field

[0001] This utility model relates to the field of dishwasher technology, specifically to a spray arm and a washing machine for cleaning tableware, fruits and vegetables. Background Technology

[0002] Dishwashers typically include a spray arm that rinses dishes or fruits and vegetables by spraying water jets. For example, Chinese patents CN204813755U ("Dishwasher Spray Arm Base, Dishwasher Spray Arm Device and Dishwasher") and CN209932651U ("A Spray Arm for a Cleaning Machine") disclose the corresponding spray arm structures.

[0003] To improve the cleaning coverage of the main spray arm, current dishwashers often increase the number of spray nozzles on the main spray arm. However, the more nozzles there are, the lower the overall water head will be, resulting in a weaker water flow impact and consequently a poorer cleaning effect. Utility Model Content

[0004] The first technical problem to be solved by this utility model is to provide a spray arm for a cleaning machine that can effectively improve the stability of the jet and the cleaning coverage while maintaining a high head, thereby improving the cleaning effect, in light of the current state of the technology.

[0005] The second technical problem to be solved by this utility model is to provide a cleaning machine with the above-mentioned spray arm, in view of the current situation of the prior art.

[0006] The technical solution adopted by this utility model to solve at least one of the above-mentioned technical problems is as follows:

[0007] A spray arm for a cleaning machine includes a body extending along its length, the body having a water inlet and a first spray hole, the body forming an internally hollow flow channel, and the flow channel being divided into at least two branch flow channels that can extend in the same direction, each branch flow channel being connected to at least one first spray hole, and in operation, each of the branch flow channels simultaneously supplies water and sprays a water jet through the corresponding first spray hole.

[0008] Dividing the flow channel into at least two branch flow channels that can extend in the same direction reduces the number of first nozzles supplied by independent flow channels, thereby reducing pressure loss, making the jet flow rate of each nozzle more stable, achieving a greater head with the same influent flow rate, and improving the spray coverage of the nozzle jet.

[0009] Preferably, the first spray hole is arranged near the first end of the main body, and the main body has a water outlet arranged near its second end. An auxiliary spray arm is rotatably connected to the water outlet, and a second spray hole is provided on the auxiliary spray arm. Simulation results show that, under a constant flow rate, one first spray hole can provide 2-3% spray coverage, while one second spray hole can provide at least 8-10% spray coverage. Therefore, this invention reduces the number of first spray holes and adds second spray holes to effectively improve the cleaning coverage while maintaining a high head.

[0010] Preferably, the auxiliary spray arm has a main body extending along its length, and the second spray holes are multiple and arranged at least partially near the end of the auxiliary spray arm. The farther the spray holes are from the rotation center, the wider their cleaning coverage. By concentrating the second spray holes closer to the end of the auxiliary spray arm, the spray coverage area can be expanded, and the cleaning effect can be improved.

[0011] Preferably, the auxiliary spray arm forms an S-shaped flow channel extending along its length. The water inlet of the auxiliary spray arm is located at the bottom of the auxiliary spray arm and is arranged corresponding to the central portion of the S-shaped flow channel. Some of the second nozzles are arranged near the first end of the S-shaped flow channel, and some of the second nozzles are arranged near the second end of the S-shaped structure. This structure allows for a longer flow channel path, enabling more second nozzles to be arranged within a limited space, thus improving cleaning coverage.

[0012] The auxiliary spray arm primarily relies on the second nozzle to provide a counterclockwise reaction force, resulting in a counterclockwise rotational force on the entire auxiliary spray arm. Besides the second nozzle, this counterclockwise rotational force also originates from the S-shaped flow channel structure of the auxiliary spray arm. The water flow impact causes different force directions on the inner wall of the S-shaped flow channel, but the overall force direction is counterclockwise, further providing the auxiliary spray arm with counterclockwise rotational power. Preferably, the inlet is located in the middle of the side wall of the main body, dividing the flow channel into a first part and a second part located on both sides of the inlet. The first part outputs water through the first nozzle, and the second part outputs water through the outlet, the auxiliary spray arm, and the second nozzle. With the above structure, the first side of the water inlet provides a spraying method that rotates with the spray arm through the first part, and the second side of the water inlet provides a spraying method that rotates with the spray arm and rotates on its own axis through the auxiliary spray arm. Of course, when the spray arm body does not rotate, the auxiliary spray arm only rotates on its own axis to further expand the spray coverage, eliminate cleaning dead corners, and improve the cleaning effect.

[0013] Preferably, the flow channel has an X-shaped structure, with the central intersection of the X-shaped structure corresponding to the water inlet. The upper part of the X-shaped structure forms the first part, and the lower part forms the second part. This structure helps to reduce the flow channel width and increase the head.

[0014] Preferably, the flow channel is provided with a baffle at the first end, which divides the first part into two parts that are close to the front and rear sidewalls of the body respectively. Part of the first spray hole is connected to the first part on one side of the baffle, and part of the first spray hole is connected to the first part on the other side of the baffle. The cut-off at the end of the flow channel can prevent the two water streams from colliding, avoid water flow interference, improve water flow stability, and improve cleaning effect.

[0015] Preferably, the two ends of the lower part of the X-shaped structure are connected and an outlet is opened at the connection. This structure facilitates water supply to the auxiliary spray arm. This structure helps to reduce the cross-section of the water flow, and under the same inlet flow rate, it can obtain a greater head and improve the cleaning effect. With the above structure, in the second part of the flow channel, at the corresponding outlet, since there are two water sources, at the inlet of the auxiliary spray arm, the two water flows are opposed one after the other. Since the supply cross-section of the two water flows is the same size and the flow rate of the two water flows is the same, the opposing forces of the two water flows are balanced and eventually converge to form an upward water flow. In this way, the water flow will not form a 90° turning and rotating water flow like in a single flow channel, but will make the entire auxiliary spray arm more uniform and stable in the vertical incoming force, avoiding the problem of the auxiliary spray arm swaying left and right.

[0016] Preferably, the main body has a first through-hole structure at the center of the corresponding first part, and the first part of the flow channel is arranged around the first through-hole structure. The main body has a second through-hole structure at the corresponding second part, and the second part of the flow channel is arranged around the second through-hole structure. This structure helps to reduce the cross-section of the water flow, and under the same water flow rate, it can obtain a greater head and improve the cleaning effect; the first and second through-hole structures can also reduce the weight of the spray arm, making it easier and more stable to rotate, and also helps to improve drainage and drying effects.

[0017] Preferably, the area of ​​the body corresponding to the second part is lowered relative to the first part to form a receiving area on the second part, and the auxiliary spray arm is installed in this receiving area. This structure allows the height of the body corresponding to the first part to be substantially the same as the height of the auxiliary spray arm corresponding to the second part, thereby eliminating energy loss caused by the height difference of the water flow and reducing the application of the head.

[0018] Preferably, the auxiliary spray arm has a third hollow structure that runs vertically through its middle section. This third hollow structure consists of two segments, each corresponding to a semi-enclosed area of ​​the S-shaped flow channel. The third hollow structure reduces the weight of the auxiliary spray arm, allowing it to rotate more easily and stably, and also improves drainage and drying efficiency.

[0019] Preferably, the flow channels are arranged around the hollowed-out portion. The hollowed-out structure helps to reduce the cross-sectional area of ​​the water flow in the flow channels, thereby achieving a greater head and improving the cleaning effect under the same water inflow rate. The hollowed-out structure also reduces the weight of the spray arm, making it easier and more stable to rotate, and is beneficial to improving drainage and drying effects.

[0020] Preferably, the number of first spray holes can be set to 2-8 as needed, preferably 4-6, and even more preferably 4. The number of first spray holes 11 can be set to 2, 3, 4, 5, 6, 7, or 8. The number of second spray holes can be the same as the number of first spray holes, preferably more than the number of first spray holes, for example, 2-16 as needed, preferably 4-14, even more preferably 6-12, and even more preferably 8, with 4 near the first end of the S-shaped flow channel and 4 near the second end of the S-shaped flow channel. Under a certain flow rate, simulation results show that one first spray hole can provide a spray coverage rate of 2-3%, while one second spray hole can provide a spray coverage rate of at least 8-10%. Therefore, this utility model reduces the number of first spray holes and increases the number of second spray holes to effectively improve the cleaning coverage rate while maintaining a high head.

[0021] Preferably, the distance between the water inlet of the main body and the water inlet of the auxiliary spray arm is Rp, half the length of the auxiliary spray arm is R2, and the minimum width of the washing chamber of the cleaning machine is D, where 0.5D - (R2 + Rp) = 3~10mm. The rotational speed ratio between the auxiliary spray arm and the main body is generally controlled between 2 and 4. With the above-mentioned settings, the first and second spray holes can basically cover the entire area of ​​the washing chamber, achieving a large spray coverage rate, thereby eliminating cleaning dead corners and improving the cleaning effect.

[0022] A cleaning machine includes a housing and the aforementioned spray arm, which is rotatably disposed within the housing.

[0023] Compared with the prior art, the advantages of this utility model are: the flow channel is divided into at least two branch flow channels that can extend in the same direction, which reduces the number of first nozzles supplied by independent flow channels, thereby reducing pressure loss, making the jet flow of each nozzle more stable, obtaining a greater head with the same water inflow, and improving the spray coverage of the nozzle jet, thereby improving the cleaning effect. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0025] Figure 2 for Figure 1 Exploded view;

[0026] Figure 3 for Figure 1A sectional view;

[0027] Figure 4 This is a schematic diagram of the flow channel structure of the main body in an embodiment of this utility model;

[0028] Figure 5 This is a schematic diagram of the flow channel structure of the auxiliary spray arm in an embodiment of the present invention;

[0029] Figure 6 This is a top view of an embodiment of the present utility model. Detailed Implementation

[0030] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0031] In the description of this utility model, it should be understood that if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] In this utility model, unless otherwise explicitly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact, or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0035] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this invention are for illustrative purposes only and do not represent the only possible implementation.

[0036] like Figures 1-6 As shown, the spray arm for the cleaning machine in this embodiment includes a body 1 extending along the length direction. The first side wall of the body 1 is provided with a water inlet 13 and the second side wall is provided with a first spray hole 11. The body 1 forms an internally hollow flow channel 12, which is divided into two branch flow channels 121' that can extend in the same direction. Each branch flow channel 121' is connected to at least one first spray hole 11. In the operating state, each branch flow channel 121' supplies water simultaneously and sprays water jets through the corresponding first spray hole 11.

[0037] The flow channel 12 is divided into two branch flow channels 121' that can extend in the same direction. This reduces the number of first nozzles 11 supplied by the independent flow channel. That is, each branch flow channel 121' is separate, and the number of first nozzles 11 supplied by each branch flow channel 121' is very small. This avoids head interference to other nozzles due to different nozzle positions and diameters, thereby reducing pressure loss and making the jet flow rate of each nozzle more stable, so as to obtain a greater head with the same water flow rate.

[0038] The first nozzle 11 is arranged near the end of the body 1 and communicates with the flow channel 12. Optionally, the water inlet 13 can also be located on the same side as the first nozzle 11. For example, when applied to the middle spray arm, both can be located on the upper side (water enters from above and sprays upwards). The middle part of the body 1 is at least partially hollowed out. The hollow structure can reduce the flow cross section of the water flow and obtain a greater head with the same water inflow. Since the cleaning coverage of the nozzles farther away from the center of rotation is larger as the spray arm rotates, it is beneficial to concentrate the first nozzles 11 closer to the end of the spray arm to expand the spray coverage.

[0039] In this embodiment, the first spray nozzle 11 is arranged near the first end of the main body 1, and the main body 1 has a water outlet 14 arranged near its second end. An auxiliary spray arm 2 is rotatably connected to the water outlet 14, and a second spray nozzle 21 is provided on the auxiliary spray arm 2. Under a certain flow rate, simulation results show that one first spray nozzle 11 can provide a spray coverage rate of 2-3%, while one second spray nozzle 21 can provide a spray coverage rate of at least 8-10%. Therefore, this embodiment reduces the number of first spray nozzles 11 and adds second spray nozzles 21 to effectively improve the cleaning coverage rate while maintaining a high head.

[0040] In this embodiment, the auxiliary spray arm 2 has a main body extending along its length, and the second spray holes 21 are multiple and arranged at least partially near the end of the auxiliary spray arm 2. The farther the spray holes are from the rotation center, the wider their cleaning coverage. By concentrating the second spray holes 21 closer to the end of the auxiliary spray arm 2, the spray coverage area is expanded, and the cleaning effect is improved.

[0041] The auxiliary spray arm 2 forms an S-shaped flow channel 23 extending along its length. The water inlet 22 of the auxiliary spray arm 2 is located at the bottom of the auxiliary spray arm 2 and is arranged corresponding to the central part of the S-shaped flow channel 23. Some of the second nozzles 21 are arranged near the first end of the S-shaped flow channel 23, and some of the second nozzles 21 are arranged near the second end of the S-shaped structure. This structure allows the flow channel 12 to have a longer path, enabling more second nozzles 21 to be arranged in a limited space, thereby improving the cleaning coverage.

[0042] The inlet 13 is located in the middle of the side wall of the main body 1, dividing the flow channel 12 into a first part 121 and a second part 122 located on both sides of the inlet 13. The first part 121 outputs water through the first nozzle 11, and the second part 122 outputs water through the outlet 14, the auxiliary spray arm 2, and the second nozzle 21. With the above structure, the first side of the inlet 13 provides a spraying method that rotates with the spray arm through the first part 121, and the second side of the inlet 13 provides a spraying method that rotates with the spray arm and rotates on its own axis through the auxiliary spray arm 2. Of course, when the spray arm main body 1 does not rotate, the auxiliary spray arm 2 only rotates on its own axis to further expand the spray coverage, eliminate cleaning dead corners, and improve the cleaning effect.

[0043] In this embodiment, the flow channel 12 has an X-shaped structure, with the central intersection of the X-shaped structure corresponding to the inlet 13. The upper part of the X-shaped structure forms the first part 121, and the lower part forms the second part 122. This structure helps to reduce the width of the flow channel 12 and increase the head.

[0044] The flow channel 12 is provided with a baffle 123 located at the first end, which divides the first part 121 into two parts that are close to the front and rear side walls of the main body 1. Part of the first nozzle 11 is connected to the first part 121 on one side of the baffle 123, and part of the first nozzle 11 is connected to the first part 121 on the other side of the baffle 123. The cut-off at the end of the flow channel 12 can prevent the two water streams from colliding, avoid water flow interference, improve water flow stability, and improve cleaning effect.

[0045] The two ends of the lower part of the aforementioned X-shaped structure are connected, and a water outlet 14 is opened at the connection point. This structure facilitates water supply to the auxiliary spray arm 2. This structure helps to reduce the cross-section of the water flow, and with the same water inlet flow rate, it can obtain a greater head and improve the cleaning effect.

[0046] In this embodiment, the main body 1 has a vertically penetrating first hollow structure 15 at the center of the corresponding first part 121, and the first part 121 of the flow channel 12 is arranged around the first hollow structure 15. The main body 1 has a vertically penetrating second hollow structure 16 at the corresponding second part 122, and the second part 122 of the flow channel 12 is arranged around the second hollow structure 16. This structure helps to reduce the cross-section of the water flow, and under the same water inflow, it can obtain a greater head and improve the cleaning effect; the first hollow structure 15 and the second hollow structure 16 can also reduce the weight of the spray arm, making it easier and more stable to rotate, and is also conducive to improving drainage and drying effects.

[0047] In this embodiment, the area of ​​the main body 1 corresponding to the second part 122 is lowered relative to the first part 121, thereby forming a receiving area on the second part 122. The auxiliary spray arm 2 is installed in this receiving area. This structure allows the height of the main body 1 corresponding to the first part 121 to be basically the same as the height of the auxiliary spray arm 2 corresponding to the second part 122, thereby eliminating energy loss caused by the height difference of the water flow and reducing the application of the head.

[0048] A third hollow structure 25 is formed in the middle of the auxiliary spray arm 2. The third hollow structure 25 consists of two segments, which are arranged in two semi-enclosed areas corresponding to the upper and lower parts of the S-shaped flow channel 23, respectively. The third hollow structure 25 can reduce the weight of the auxiliary spray arm 2, making it easier and more stable to rotate, and is also beneficial to improving drainage and drying effects.

[0049] In this embodiment, the number of first nozzles 11 can be 2-8 as needed, preferably 4-6, and even more preferably 4. The number of second nozzles 21 can be the same as the number of first nozzles 11, preferably more than the number of first nozzles 11, for example, 2-16 as needed, preferably 4-14, even more preferably 6-12, and even more preferably 8, with 4 near the first end of the S-shaped flow channel 23 and 4 near the second end of the S-shaped flow channel 23; or, 3 near the first end of the S-shaped flow channel 23, 1 located in the middle of the extension of the S-shaped flow channel 23 where the 3 second nozzles 21 are located (i.e., between the first end of the S-shaped flow channel 23 and the inlet 22), and 4 near the second end of the S-shaped flow channel 23. Under a constant flow rate, simulation results show that a first nozzle 11 can provide a spray coverage rate of 2-3%, while a second nozzle 21 can provide a spray coverage rate of at least 8-10%. Therefore, in this embodiment, the number of first nozzles 11 is reduced and the number of second nozzles 21 is increased to effectively improve the cleaning coverage rate while maintaining a high head.

[0050] The distance between the water inlet 13 of the main body 1 and the water inlet 22 of the auxiliary spray arm 2 is Rp, half the length of the auxiliary spray arm 2 is R2, and the minimum width of the washing chamber of the cleaning machine is D. 0.5D-R2+Rp=3~10mm. The rotational speed ratio between the auxiliary spray arm 2 and the main body 1 is generally controlled between 2 and 4. With the above-mentioned settings, the first spray hole 11 and the second spray hole 21 can basically cover the entire area of ​​the washing chamber, achieving a large spray coverage rate, thereby eliminating cleaning dead corners and improving the cleaning effect.

[0051] As a preferred embodiment, at least 75% of the first nozzles 11 are located within one-third of the length from the end of the body 1 to the center of rotation. Preferably, the auxiliary nozzle arm 2 is also within this range.

[0052] The cleaning machine of this embodiment includes a housing and the aforementioned spray arm, which is rotatably disposed within the housing.

[0053] In this embodiment, a hollow structure is provided on the spray arm body 1. This hollow structure can penetrate the spray arm body 1 from top to bottom, which can reduce the cross-section of the water flow and obtain a greater head with the same water inflow. It can also reduce the weight of the spray arm, making it easier and more stable to rotate. At the same time, the hollow structure is also conducive to improving drainage and drying effects. Since the spray hole has a wider cleaning coverage area as the spray arm rotates, this embodiment sets the first spray hole 11 closer to the end of the spray arm to expand the spray coverage area and improve the cleaning effect.

[0054] In this embodiment, the first nozzle 11 of the first part 121 is close to the outer end of the main body 1, making it difficult to cover the central area of ​​the main body 1. This problem can be effectively compensated for by the second nozzle 21 on the rotating auxiliary spray arm 2 of the second part 122. Through the cooperation of the two nozzles under the overall rotation and self-rotation, a good spray coverage rate is achieved with a smaller number of nozzles.

[0055] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A spray arm for a cleaning machine, comprising a body (1) extending along its length, the body (1) having a water inlet (13) and a first spray nozzle (11), characterized in that: The body (1) has a hollow internal flow channel (12), and the flow channel (12) is divided into at least two branch flow channels (121') that can extend in the same direction. Each branch flow channel (121') is connected to at least one first nozzle (11). In operation, each branch flow channel (121') supplies water simultaneously and sprays water jets through the corresponding first nozzle (11).

2. The spray arm for a cleaning machine according to claim 1, characterized in that: The first nozzle (11) is arranged near the first end of the body (1), and the body (1) has a water outlet (14) arranged near its second end. An auxiliary spray arm (2) is rotatably connected to the water outlet (14), and a second nozzle (21) is provided on the auxiliary spray arm (2).

3. The spray arm for a cleaning machine according to claim 2, characterized in that: The auxiliary spray arm (2) has a main body extending along its length, and the second spray holes (21) are multiple and at least partially arranged near the ends of the auxiliary spray arm (2).

4. The spray arm for a cleaning machine according to claim 2, characterized in that: An S-shaped flow channel (23) extending along the length direction is formed in the auxiliary spray arm (2). The water inlet (22) of the auxiliary spray arm (2) is opened at the bottom of the auxiliary spray arm (2) and is arranged in the central part of the S-shaped flow channel (23). Some of the second nozzles (21) are arranged near the first end of the S-shaped flow channel (23) and some of the second nozzles (21) are arranged near the second end of the S-shaped structure.

5. The spray arm for a cleaning machine according to claim 2, characterized in that: The inlet (13) is located in the middle of the side wall of the body (1) and divides the flow channel (12) into a first part (121) and a second part (122) located on both sides of the inlet (13). The first part (121) includes the branch flow channel (121') and outputs water through the first nozzle (11). The second part (122) outputs water through the outlet (14), the auxiliary spray arm (2) and the second nozzle (21).

6. The spray arm for a cleaning machine according to claim 5, characterized in that: The flow channel (12) has an X-shaped structure, and the central intersection of the X-shaped structure is arranged corresponding to the water inlet (13). The upper part of the X-shaped structure constitutes the first part (121), and the lower part constitutes the second part (122).

7. The spray arm for a cleaning machine according to claim 6, characterized in that: The flow channel (12) is provided with a baffle (123) located at the first end, which divides the first part (121) into two parts that are close to the front and rear side walls of the body (1). Part of the first nozzle (11) is connected to the first part (121) on one side of the baffle (123), and part of the first nozzle (11) is connected to the first part (121) on the other side of the baffle (123).

8. The spray arm for a cleaning machine according to claim 6, characterized in that: The two ends of the lower part of the X-shaped structure are connected and an outlet is opened at the connection (14).

9. The spray arm for a cleaning machine according to claim 5, characterized in that: The main body (1) has a first hollow structure (15) that runs vertically through the center of the corresponding first part (121), and the first part (121) of the flow channel (12) is arranged around the first hollow structure (15).

10. The spray arm for a cleaning machine according to claim 5, characterized in that: The main body (1) has a second hollow structure (16) that runs vertically through the second part (122) and the second part (122) of the flow channel (12) is arranged around the second hollow structure (16).

11. The spray arm for a cleaning machine according to claim 5, characterized in that: The area of ​​the body (1) corresponding to the second part (122) is sunk relative to the first part (121) to form a receiving area on the second part (122), and the auxiliary spray arm (2) is installed in the receiving area.

12. The spray arm for a cleaning machine according to claim 4, characterized in that: The auxiliary spray arm (2) forms a third hollow structure (25) that runs vertically through the middle. The third hollow structure (25) is arranged in two sections, each corresponding to a semi-enclosed area of ​​the S-shaped flow channel (23).

13. The spray arm for a cleaning machine according to claim 1, characterized in that: The main body is provided with a hollowed-out section that runs through the top and bottom, and the flow channel (12) is arranged around the hollowed-out section.

14. The spray arm for a cleaning machine according to any one of claims 1 to 13, characterized in that: The number of the first nozzles (11) is 2, 3, 4, 5, 6, 7, or 8.

15. The spray arm for a cleaning machine according to any one of claims 2 to 12, characterized in that: The number of the second nozzles (21) is greater than or equal to the number of the first nozzles (11).

16. The spray arm for a cleaning machine according to claim 15, characterized in that: The number of the second nozzle (21) is 6-12.

17. The spray arm for a cleaning machine according to any one of claims 2 to 12, characterized in that: The distance between the water inlet (13) of the main body (1) and the water inlet (22) of the auxiliary spray arm (2) is Rp, half the length of the auxiliary spray arm (2) is R2, and the minimum width of the washing chamber of the cleaning machine is D, 0.5D-(R2+Rp)=3~10mm.

18. A cleaning machine, comprising a housing, characterized in that: It also includes a spray arm as described in any one of claims 1 to 17, the spray arm being rotatably disposed in the housing.

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