Spray arm structure for cleaning machines and cleaning machines using it

Abstract

This utility model relates to a spray arm structure for a cleaning machine and a cleaning machine using the same. It includes an inner tank and a spray arm installed within the inner tank. The spray arm includes a main arm and a secondary arm movably connected to a first end of the main arm. Spray holes are provided on both the main arm and the secondary arm. The rotation center of the spray arm is located on the main arm, and the length between the rotation center and the free end of the secondary arm is greater than the distance between the rotation center and the side walls of the inner tank. During rotation, the secondary arm extends along the length of the main arm under the action of centrifugal force, becoming straight. When the free end of the secondary arm abuts against the side walls of the inner tank while the secondary arm is straight, the secondary arm bends relative to the main arm, becoming non-straight. Compared with the prior art, this utility model expands the spray coverage area of ​​the spray arm, avoids spray dead zones, and improves the cleaning effect of the cleaning machine. It also prevents interference between the spray arm and the side walls of the inner tank, ensuring the normal operation of the cleaning machine.

Description

Technical Field

[0001] This utility model relates to the field of cleaning machines, and in particular to a spray arm structure for a cleaning machine and a cleaning machine using the same. Background Technology

[0002] With social development and technological advancements, people's demands for a better life are increasing, and more and more families are using dishwashers. Dishwashers not only bring convenience but also save people time. The dishwasher's inner drum is equipped with spray arms. During operation, the wash pump delivers high-pressure water through pipes to the spray arms, which then sprays and washes the dishes in the inner drum through spray nozzles. After spraying, the water collects at the bottom of the dishwasher, and the wash pump then returns the water to the spray arms, creating a continuous cycle for cleaning the dishes. Examples include Chinese invention patents with application number CN202310354244.9 (publication number CN116548886A) and patent number ZL201711099396.X (authorization announcement number CN109758070B).

[0003] However, the cross-section of the inner drum of existing dishwashers is generally square, while the rotation trajectory of the spray arm is circular (e.g., Figure 11 As shown in b), the spray holes on the spray arm can only sweep across the surface of the tableware in a circular pattern, which means that the spray arm cannot sweep the four corners of the inner tank, creating spray dead zones and affecting the cleaning effect of the dishwasher. Summary of the Invention

[0004] The first technical problem to be solved by this utility model is to provide a spray arm structure for a cleaning machine that can avoid the spray dead angle of the spray arm, in contrast to the prior art.

[0005] The second technical problem to be solved by this utility model is to provide a spray arm structure for a cleaning machine that can avoid spray dead angles and ensure normal rotation of the spray arm, in contrast to the prior art.

[0006] The third technical problem to be solved by this utility model is to provide a spray arm structure for a cleaning machine that can avoid spray dead angles and has a simple internal structure, in contrast to the prior art.

[0007] The fourth technical problem to be solved by this utility model is to provide a cleaning machine with the above-mentioned spray arm structure, in contrast to the prior art.

[0008] The technical solution adopted by this utility model to solve at least one of the above-mentioned technical problems is as follows: a spray arm structure for a cleaning machine, comprising an inner tank with a square cross-section and a spray arm rotatably installed in the inner tank in a horizontal direction, characterized in that...

[0009] The spray arm includes a main arm and a secondary arm movably connected to the first end of the main arm. Spray holes are provided on both the main arm and the secondary arm. The rotation center of the spray arm is located on the main arm, and the length between the rotation center and the free end of the secondary arm is greater than the distance between the rotation center and each side wall of the inner liner.

[0010] Furthermore, during the rotation of the spray arm, the aforementioned auxiliary arm extends along the length of the main arm under the action of centrifugal force and is in a straight state. When the free end of the auxiliary arm abuts against the side walls of the inner tank while the auxiliary arm is in a straight state, the auxiliary arm bends relative to the main arm and is in a non-straight state.

[0011] Furthermore, the first end of the main arm is rotatably connected to the connecting end of the auxiliary arm, so that the auxiliary arm can swing horizontally back and forth between the first position and the second position with the connection point of the two as the center. In the state of the spray arm rotation, the auxiliary arm is limited to the first position and is in a straight state under the action of the rotational centrifugal force, while the auxiliary arm is in a non-straight state in the second position and can rotate towards the first position under the action of the rotational centrifugal force. The rotational connection between the main arm and the auxiliary arm allows the auxiliary arm to swing horizontally back and forth between the first and second positions, thus enabling the auxiliary arm to switch between a straight and non-straightened state (horizontally bent relative to the main arm). The centrifugal force generated by the rotation of the spray arm limits the auxiliary arm to the first position, keeping it straight while the spray arm is rotating. When the free end of the auxiliary arm abuts against the side wall of the inner tank, the spray arm stops rotating, causing the centrifugal force acting on the auxiliary arm to disappear. Under inertia, the auxiliary arm rotates to the second position and becomes non-straightened, and the free end of the auxiliary arm detaches from the side wall of the inner tank. The spray arm continues to rotate, and the auxiliary arm rotates from the second position towards the first position under the action of the centrifugal force and is then limited to the first position.

[0012] Furthermore, the first end of the main arm is sleeved with the connecting end of the auxiliary arm, and the inner cavities of the two are connected. In this way, water in the main arm can flow into the auxiliary arm, and the auxiliary arm and the main arm share the same water inlet channel, eliminating the need for a separate water inlet channel, thereby simplifying the internal structure of the spray arm.

[0013] Furthermore, of the first end of the main arm and the connecting end of the auxiliary arm, one is provided with a first connecting sleeve and the other is provided with a second connecting sleeve for fitting onto the first connecting sleeve. When the first connecting sleeve and the second connecting sleeve are nested together, the auxiliary arm can swing horizontally back and forth between the first position and the second position with the two as the center. In the state of the spray arm rotation, the auxiliary arm is limited to the first position and is in a straight state under the action of rotational centrifugal force, while the auxiliary arm is in a non-straight state in the second position and can rotate towards the first position under the action of rotational centrifugal force. The first and second connecting sleeves connect the first end of the main arm to the connecting end of the auxiliary arm, and also enable the rotational connection between the main arm and the auxiliary arm. This allows the auxiliary arm to swing back and forth horizontally between the first and second positions, thus enabling the auxiliary arm to switch between a straight and non-straightened state (horizontally bent relative to the main arm). The centrifugal force generated by the rotation of the spray arm limits the auxiliary arm to the first position, keeping it straight while the spray arm is rotating. When the free end of the auxiliary arm abuts against the side wall of the inner tank, the spray arm stops rotating, causing the centrifugal force acting on the auxiliary arm to disappear. Under inertia, the auxiliary arm rotates to the second position and becomes non-straightened. The free end of the auxiliary arm disengages from the side wall of the inner tank, and the spray arm continues to rotate. Under the action of the centrifugal force, the auxiliary arm rotates from the second position toward the first position and is then limited to the first position.

[0014] Furthermore, the first connecting sleeve is cylindrical in shape, with an opening on its first side that communicates with the port at the first end of the main arm, and the first connecting sleeve and the main arm are integral parts. A guide opening is provided on the second side of the first connecting sleeve along the circumferential direction.

[0015] The aforementioned second connecting sleeve is also cylindrical in shape. The first side of the second connecting sleeve is open and connected to the port of the connecting end of the auxiliary arm. The second connecting sleeve and the auxiliary arm are integral parts. The second side of the second connecting sleeve has a guide port for always communicating with the inner cavity of the main arm during the rotation of the spray arm.

[0016] Furthermore, the central axis of the second connecting sleeve coincides with that of the first connecting sleeve. Both can rotate relative to each other around this central axis and guided by their sidewalls. During this rotation, the auxiliary arm can move back and forth along the length of the guide opening. When the auxiliary arm abuts against the first end of the guide opening, it extends along the length of the main arm in a straight position. When the auxiliary arm abuts against the second end of the guide opening, it bends horizontally relative to the main arm in a non-straight position. The first end of the guide opening is the first position, and the second end is the second position. Through the specific structural design of the first and second connecting sleeves, the auxiliary arm can smoothly swing horizontally back and forth between the first and second positions. Furthermore, the openings in the first and second connecting sleeves allow the inner cavity of the main arm to communicate with the inner cavity of the auxiliary arm via the guide openings.

[0017] Furthermore, the opening on the first side of the first connecting sleeve overlaps with the port at the main arm connection point to form a connecting port. This connecting port extends along the length of the side wall of the first connecting sleeve on that side, and the aforementioned guide port extends along the length of the side wall of the second connecting sleeve on that side, with the length of the guide port being greater than or equal to the length of the connecting port. This ensures that the inner cavity of the main arm and the inner cavity of the auxiliary arm remain connected during the rotation of the spray arm, guaranteeing smooth water flow from the main arm to the auxiliary arm.

[0018] Furthermore, it also includes an elastic element. When the auxiliary arm is in the extended state, the elastic element is not under force, while when the auxiliary arm is not extended, the elastic element is under force and deforms, causing the auxiliary arm to tend to move in the extended direction. In this way, under the combined action of the rotational centrifugal force of the spray arm and the elastic force of the elastic element, the auxiliary arm can better switch from the non-extended state to the extended state and remain in the extended state.

[0019] Furthermore, the elastic element is a spring, one end of which is mounted on a first mounting base located inside the main arm, and the other end is mounted on a second mounting base located inside the auxiliary arm.

[0020] In the extended state of the auxiliary arm, the elastic element extends along the length of the main arm. In the non-extended state of the auxiliary arm, the elastic element deforms as the auxiliary arm bends. Specifically, a spring is selected as the elastic element, and the spring is securely installed in the main arm and auxiliary arm through the first and second mounting seats. In the non-extended state of the auxiliary arm, the spring bends and deforms, so that the auxiliary arm tends to rotate in the direction of the first position.

[0021] Furthermore, in the extended state of the auxiliary arm, the length between the rotation center of the spray arm and the free end of the auxiliary arm is equal to the distance between the rotation center and each corner of the inner liner. This allows the free end of the auxiliary arm to extend into each corner of the inner liner, further expanding the spray coverage area of ​​the spray arm.

[0022] The technical solution adopted to further solve the fourth technical problem mentioned above is: a cleaning machine, characterized in that it includes the spray arm structure for the cleaning machine as described above.

[0023] Compared with the prior art, the advantages of this utility model are as follows: the spray arm includes a main arm and a secondary arm. The length between the rotation center of the spray arm and the free end of the secondary arm is greater than the distance between the rotation center and each side wall of the inner liner. During the rotation of the spray arm, the secondary arm extends along the length direction of the main arm and is straightened under the action of rotational centrifugal force, so that the spray arm can spray to the corners of the inner liner.

[0024] Compared to existing technologies, this design expands the spray coverage area of ​​the spray arm (by more than 20%), eliminating spray dead zones and improving the cleaning effect of the cleaning machine. Furthermore, when the auxiliary arm is extended and its free end abuts against the side walls of the inner tank, the auxiliary arm bends relative to the main arm, thus preventing interference between the spray arm and the side walls of the inner tank, ensuring normal rotation of the spray arm, and consequently, ensuring the normal operation of the cleaning machine. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the spray arm structure in Embodiment 1 of this utility model (with the auxiliary arm not fully extended);

[0026] Figure 2 This is a schematic diagram of the spray arm structure in another state (with the auxiliary arm extended) in Embodiment 1 of this utility model;

[0027] Figure 3 This is a schematic diagram of the spray arm in Embodiment 1 of this utility model (with the auxiliary arm extended).

[0028] Figure 4 This is a schematic diagram of the spray arm in another state in Embodiment 1 of this utility model (the auxiliary arm is not extended);

[0029] Figure 5 This is an exploded view of the spray arm in Embodiment 1 of this utility model;

[0030] Figure 6 for Figure 5 A structural diagram from another direction;

[0031] Figure 7 This is a cross-sectional view of the spray arm in Embodiment 1 of this utility model (with the auxiliary arm not extended);

[0032] Figure 8 for Figure 7 Enlarged view of section A;

[0033] Figure 9 This is a cross-sectional view of the spray arm in Embodiment 2 of this utility model (with the auxiliary arm extended);

[0034] Figure 10 This is a cross-sectional view of the spray arm in Embodiment 2 of this utility model from another direction (with the auxiliary arm extended);

[0035] Figure 11 This is a comparison diagram of the rotation trajectory of the spray arm in this utility model and the rotation trajectory of the spray arm in the prior art. Detailed Implementation

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0037] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They 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. Since the embodiments disclosed in this utility model can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0038] Example 1:

[0039] A cleaning machine (specifically a dishwasher in this embodiment) includes a spray arm structure, such as... Figures 1 to 8 As shown, the spray arm structure includes a square-shaped inner liner 1 and a spray arm 2 horizontally installed in the inner liner 1. Specifically, the spray arm 2 includes a main arm 21 and a secondary arm 22 movably connected to the first end of the main arm 21. Spray holes 20 are provided on both the main arm 21 and the secondary arm 22. The rotation center (O) of the spray arm 2 is located on the main arm 21, and the length (H1) between the rotation center (O) and the free end of the secondary arm 22 is greater than the distance (H2) between the rotation center (O) and each side wall of the inner liner 1. Figure 2 As shown. In this embodiment, the cross-section of the inner liner 1 is square, therefore the distance H2 between the rotation center (O) and each side wall of the inner liner 1 is equal, as shown. Figure 1 and Figure 2 As shown. Furthermore, during the rotation of the spray arm 2, the aforementioned auxiliary arm 22 extends along the length direction of the main arm 21 under the action of rotational centrifugal force and is in a straight state. When the free end of the auxiliary arm 22 abuts against the side walls of the inner liner 1 while the auxiliary arm 22 is in a straight state, the auxiliary arm 22 bends relative to the main arm 21 and is in a non-straight state.

[0040] As can be seen from the above, the spray arm 2 includes a main arm 21 and a secondary arm 22. The length between the rotation center of the spray arm 2 and the free end of the secondary arm 22 is greater than the distance between the rotation center and the side walls of the inner liner 1. During the rotation of the spray arm 2, the secondary arm 22 extends along the length direction of the main arm 21 under the action of centrifugal force, thus allowing the spray arm 2 to spray to the corners of the inner liner 1. Compared with the prior art, the spray coverage area of ​​the spray arm 2 is expanded (it can be increased by more than 20% compared with the prior art), such as... Figure 11 As shown, a represents the spray coverage area of ​​this invention, and b represents the spray coverage area of ​​the prior art. This avoids spray dead zones, improving the cleaning effect of the cleaning machine and eliminating cleaning blind spots. Furthermore, when the auxiliary arm 22 is in its straightened state, and its free end abuts against the side walls of the inner tank 1, the auxiliary arm 22 is bent relative to the main arm 21 and is in a non-straightened state. This prevents interference between the spray arm 2 and the side walls of the inner tank 1, ensuring the normal rotation of the spray arm 2 and thus guaranteeing the normal operation of the cleaning machine.

[0041] Furthermore, the first end of the main arm 21 is rotatably connected to the connecting end of the auxiliary arm 22, so that the auxiliary arm 22 can swing back and forth horizontally between the first position 311 and the second position 312 with the connection point of the two as the center. In the state of the spray arm 2 rotating, the auxiliary arm 22 is limited to the first position 311 and is in a straight state under the action of the rotational centrifugal force, while the auxiliary arm 22 is in a non-straight state in the second position 312 and can rotate towards the first position 311 under the action of the rotational centrifugal force. The rotational connection between the main arm 21 and the auxiliary arm 22 enables the auxiliary arm 22 to swing horizontally back and forth between the first position 311 and the second position 312, thereby enabling the auxiliary arm 22 to switch between a straight state and a non-straight state (horizontally bent relative to the main arm 21). The rotational centrifugal force generated by the rotation of the spray arm 2 limits the auxiliary arm 22 to the first position 311, thus keeping the auxiliary arm 22 straight while the spray arm 2 is rotating. When the free end of the auxiliary arm 22 abuts against the side wall of the inner tank 1, the spray arm 2 stops rotating, and the rotational centrifugal force acting on the auxiliary arm 22 disappears. Under the action of inertia, the auxiliary arm 22 rotates to the second position 312 and is in a non-straight state. The free end of the auxiliary arm 22 disengages from the side wall of the inner tank 1. The spray arm 2 continues to rotate, and the auxiliary arm 22 rotates from the second position 312 toward the first position 311 under the action of the rotational centrifugal force and is limited to the first position 311.

[0042] Furthermore, the first end of the main arm 21 is connected to the connecting end of the auxiliary arm 22, and their inner cavities are interconnected. This allows water in the main arm 21 to flow into the auxiliary arm 22, which shares a water inlet with the main arm 21, eliminating the need for a separate water inlet and thus simplifying the internal structure of the spray arm. In this embodiment, a water inlet 23 is provided on the bottom wall of the main arm 21, located at the rotation center (O) of the spray arm 2. Figure 3, Figure 5 , Figure 6 , Figure 7 As shown.

[0043] Furthermore, of the first end of the main arm 21 and the connecting end of the auxiliary arm 22, one is provided with a first connecting sleeve 3 and the other is provided with a second connecting sleeve 4 for fitting onto the first connecting sleeve 3. When the first connecting sleeve 3 and the second connecting sleeve 4 are nested together, the auxiliary arm 22 can swing back and forth horizontally between the first position 311 and the second position 312 with the two as the center. In the state of the spray arm 2 rotating, the auxiliary arm 22 is limited to the first position 311 and is in a straight state under the action of the rotational centrifugal force, while the auxiliary arm 22 is in a non-straight state in the second position 312 and can rotate towards the first position 311 under the action of the rotational centrifugal force. The first connecting sleeve 3 and the second connecting sleeve 4 enable the first end of the main arm 21 to be connected to the connecting end of the auxiliary arm 22, and enable the main arm 21 and the auxiliary arm 22 to be rotated, thereby enabling the auxiliary arm 22 to swing back and forth horizontally between the first position 311 and the second position 312, and thus enabling the auxiliary arm 22 to switch between the straightened state and the non-straightened state (horizontally bent relative to the main arm 21).

[0044] Specifically, in this embodiment, as Figures 3-8 As shown, the first connecting sleeve 3 is cylindrical in shape. Its first side opening communicates with the port at the first end of the main arm 21, and the first connecting sleeve 3 and the main arm 21 are integral parts. A guide port 31 is provided circumferentially on the second side of the first connecting sleeve 3. The second connecting sleeve 4 is also cylindrical in shape. Its first side opening communicates with the port at the connecting end of the auxiliary arm 22, and the second connecting sleeve 4 and the auxiliary arm 22 are integral parts. A guide port 41 is provided on the second side of the second connecting sleeve 4 to ensure continuous communication with the inner cavity of the main arm 21 during the rotation of the spray arm 2. Furthermore, the central axes of the second connecting sleeve 4 and the first connecting sleeve 3 coincide, allowing them to rotate relative to each other around this central axis and guided by their sidewalls. Furthermore, during the mutual rotation of the two, the auxiliary arm 22 can move back and forth along the length direction of the guide port 31. When the auxiliary arm 22 abuts against the first end of the guide port 31, the auxiliary arm 22 extends along the length direction of the main arm 21 and is in the straightened state. When the auxiliary arm 22 abuts against the second end of the guide port 31, the auxiliary arm 22 bends horizontally relative to the main arm 21 and is in a non-straightened state. The first end of the guide port 31 is the first position 311, and the second end is the second position 312. Through the specific structural design of the first connecting sleeve 3 and the second connecting sleeve 4, the auxiliary arm 22 can swing smoothly back and forth horizontally between the first position 311 and the second position 312. Through the opening of the first connecting sleeve 3 and the second connecting sleeve 4, the inner cavity of the main arm 21 and the inner cavity of the auxiliary arm 22 can be connected by the guide port 41.

[0045] Preferably, such as Figure 8 As shown, the opening on the first side of the first connecting sleeve 3 overlaps with the port at the connection point of the main arm 21 to form a connecting port 7. This connecting port 7 extends along the length of the side wall of the first connecting sleeve 3 on that side, and the guide port 41 extends along the length of the side wall of the second connecting sleeve 4 on that side, with the length of the guide port 41 being greater than or equal to the length of the connecting port 7. This ensures that the inner cavity of the main arm 21 and the inner cavity of the auxiliary arm 22 remain connected during the rotation of the spray arm 2, guaranteeing that water flows smoothly from the main arm 21 to the auxiliary arm 22.

[0046] Preferably, in the extended state of the auxiliary arm 22, the length between the rotation center of the spray arm 2 and the free end of the auxiliary arm 22 is equal to the distance (H3) between the rotation center and each corner of the inner liner 1. This allows the free end of the auxiliary arm 22 to extend into each corner of the inner liner 1, further expanding the spray coverage of the spray arm 2.

[0047] In this embodiment, the auxiliary arm 22 is only provided on the first end of the main arm 21. Of course, the present invention can also provide the auxiliary arm 22 at the other end of the main arm 21, that is, the auxiliary arm 22 is provided at both ends of the main arm 21.

[0048] Example 2:

[0049] like Figure 9 and Figure 10 As shown, unlike Embodiment 1, this embodiment also includes an elastic element 5. When the auxiliary arm 22 is in the extended state, the elastic element 5 is not under force. However, when the auxiliary arm 22 is not extended, the elastic element 5 is under force and deforms, causing the auxiliary arm 22 to tend to move in the extended direction. Thus, under the combined action of the centrifugal force of the spray arm 2's rotation and the elastic force of the elastic element 5, the auxiliary arm 22 can better switch from the non-extended state to the extended state and remain in the extended state.

[0050] Specifically, the aforementioned elastic element 5 is a spring. One end of the spring is mounted on a first mounting base 61 located inside the main arm 21, and the other end is mounted on a second mounting base 62 located inside the auxiliary arm 22. When the auxiliary arm 22 is extended, the elastic element 5 extends along the length of the main arm 21. When the auxiliary arm 22 is not extended, the elastic element 5 deforms as the auxiliary arm 22 bends. Specifically, a spring is chosen as the elastic element 5, and the first mounting base 61 and the second mounting base 62 ensure stable installation of the spring in the main arm 21 and the auxiliary arm 22. When the auxiliary arm 22 is not extended, the spring bends and deforms, giving the auxiliary arm 22 a tendency to rotate towards the first position 311.

Claims

1. A spray arm structure for a cleaning machine, comprising an inner tank (1) with a square cross-section and a spray arm (2) rotatably mounted in the inner tank (1) in a horizontal direction, characterized in that, The spray arm (2) includes a main arm (21) and a secondary arm (22) movably connected to the first end of the main arm (21). Spray holes (20) are provided on both the main arm (21) and the secondary arm (22). The rotation center of the spray arm (2) is located on the main arm (21), and the length between the rotation center and the free end of the secondary arm (22) is greater than the distance between the rotation center and each side wall of the inner liner (1). Furthermore, during the rotation of the spray arm (2), the aforementioned auxiliary arm (22) extends along the length of the main arm (21) under the action of rotational centrifugal force and is in a straight state. When the free end of the auxiliary arm (22) abuts against each side wall of the inner liner (1) while the auxiliary arm (22) is in a straight state, the auxiliary arm (22) bends relative to the main arm (21) and is in a non-straight state.

2. The spray arm structure for a washing machine according to claim 1, wherein The first end of the main arm (21) is rotatably connected to the connecting end of the auxiliary arm (22), so that the auxiliary arm (22) can swing back and forth horizontally between the first position (311) and the second position (312) with the connection point of the two as the center. In the state of the spray arm (2) rotation, the auxiliary arm (22) is limited to the first position (311) and is in a straight state under the action of the rotational centrifugal force, while the auxiliary arm (22) is in a non-straight state in the second position (312) and can rotate towards the first position (311) under the action of the rotational centrifugal force.

3. The spray arm structure for a washing machine according to claim 1, wherein The first end of the main arm (21) is connected to the connecting end of the auxiliary arm (22), and the inner cavities of the two are connected.

4. The spray arm structure for a washing machine according to claim 3, wherein Of the first end of the main arm (21) and the connecting end of the auxiliary arm (22), one is provided with a first connecting sleeve (3) and the other is provided with a second connecting sleeve (4) for fitting onto the first connecting sleeve (3). When the first connecting sleeve (3) and the second connecting sleeve (4) are nested together, the auxiliary arm (22) can swing back and forth horizontally between the first position (311) and the second position (312) with the two as the center. When the spray arm (2) is rotating, the auxiliary arm (22) is limited to the first position (311) and is in a straight state under the action of the centrifugal force of rotation. When the auxiliary arm (22) is in the second position (312), it is in a non-straight state and can rotate towards the first position (311) under the action of the centrifugal force of rotation.

5. The spray arm structure for a washing machine according to claim 4, wherein The first connecting sleeve (3) is cylindrical in shape. The first side of the first connecting sleeve (3) is open and connected to the port of the first end of the main arm (21). The first connecting sleeve (3) and the main arm (21) are integral parts. The second side of the first connecting sleeve (3) is provided with a guide opening (31) along the circumferential direction. The second connecting sleeve (4) is also cylindrical in shape. The first side of the second connecting sleeve (4) is open and connected to the port of the connecting end of the auxiliary arm (22). The second connecting sleeve (4) and the auxiliary arm (22) are integral parts. The second side of the second connecting sleeve (4) is provided with a guide port (41) for communicating with the inner cavity of the main arm (21) during the rotation of the spray arm (2). Furthermore, the central axis of the second connecting sleeve (4) coincides with that of the first connecting sleeve (3), and the two can rotate relative to each other with the central axis as the center and their side walls as guides. In the state of mutual rotation, the auxiliary arm (22) can move back and forth along the length direction of the guide opening (31). When the auxiliary arm (22) abuts against the first end of the guide opening (31), the auxiliary arm (22) extends along the length direction of the main arm (21) and is in the straight state. When the auxiliary arm (22) abuts against the second end of the guide opening (31), the auxiliary arm (22) bends horizontally relative to the main arm (21) and is in the non-straight state. The first end of the guide opening (31) is the first position (311), and the second end is the second position (312).

6. The spray arm structure for a washing machine according to claim 5, wherein The opening on the first side of the first connecting sleeve (3) overlaps with the port at the connection point of the main arm (21) to form a connecting port (7). The connecting port (7) extends along the length direction of the side wall of the first connecting sleeve (3) on the same side. The aforementioned guide port (41) extends along the length direction of the side wall of the second connecting sleeve (4) on the same side, and the length of the guide port (41) is greater than or equal to the length of the connecting port (7).

7. A spray arm structure for a washing machine according to claim 5 or 6, wherein It also includes an elastic element (5). When the auxiliary arm (22) is in the extended state, the elastic element (5) is not under force, while when the auxiliary arm (22) is not extended, the elastic element (5) is under force and deforms, causing the auxiliary arm (22) to tend to move in the extended direction.

8. The spray arm structure for a washing machine according to claim 7, wherein The elastic element (5) is a spring, one end of which is mounted on a first mounting base (61) located inside the main arm (21), and the other end is mounted on a second mounting base (62) located inside the auxiliary arm (22). When the auxiliary arm (22) is straight, the elastic element (5) extends along the length of the main arm (21), while when the auxiliary arm (22) is not straight, the elastic element (5) deforms as the auxiliary arm (22) bends.

9. The spray arm structure for a washing machine according to claim 7, wherein When the auxiliary arm (22) is in the extended state, the length between the rotation center of the spray arm (2) and the free end of the auxiliary arm (22) is equal to the distance between the rotation center and each corner of the inner liner (1).

10. A cleaning machine characterized by, Includes the spray arm structure for a cleaning machine as described in any one of claims 1 to 9.

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