A method for installing a spray arm of a cleaning machine

Abstract

The present invention relates to an installation method for a spray arm of a cleaning machine. During assembly: (1) the water inlet of the spray arm is placed upward, and the second connecting piece is placed on the outer periphery of the water inlet sleeve and allowed to fall freely; (2) the first connecting piece is placed on the outer periphery of the water inlet sleeve and moved downward, and the first connecting piece is locked and connected to the water inlet sleeve by using a first limiting assembly; (3) the first connecting piece, the second connecting piece, and the spray arm are placed above a water pump, with the water inlet facing downward, and the second connecting piece is rotated and locked on the water pump by using a second limiting assembly; in the assembled state, the upper end face of the first connecting piece and the inner top wall of the second connecting piece form the mating surface, and the lower end face of the first connecting piece is arranged corresponding to the top of the water outlet sleeve. Since the first connecting piece and the second connecting piece adopt mating surfaces that press against each other in the up and down directions and rotate to fit, compared with the existing clamping ring matching method, the force matching surface is large and stable, which is conducive to improving the rotation stability of the spray arm.

Description

Technical Field

[0001] The invention relates to the technical field of dishwashers, and in particular to a method for installing a spray arm of a washing machine. Background Art

[0002] In dishwashers that use an open water flow system, the spray arm is generally fixed to the bottom of the sink by snapping with the guide seat. Since the water inlet of the spray arm needs to rotate with the top of the guide seat, there is a gap at the joint, and positive pressure is generated in the inner area of ​​the water inlet of the spray arm during the water drawing process, it is easy for water to leak at the joint gap between the spray arm and the top of the guide seat, affecting the energy efficiency and water efficiency of the dishwasher.

[0003] In order to solve the above problems, the applicant's prior application CN202221176060.5 "Open water pump spray arm installation structure and cleaning machine" discloses a structure, which includes a guide seat, a spray arm and an impeller, the guide seat has a vertically arranged guide sleeve, the spray arm is rotatably constrained at the top of the guide seat and has a water inlet corresponding to the upper port of the guide sleeve on the bottom wall, and a drainage sleeve extending downward along the water inlet is provided on the bottom wall of the spray arm, and the drainage sleeve is rotatably inserted in the upper part of the guide sleeve; the upper part of the impeller is a centrifugal impeller rotatably located in the spray arm, and the lower part is an axial flow impeller rotatably located in the guide sleeve, and the connection between the centrifugal impeller and the axial flow impeller is arranged corresponding to the edge of the water inlet.

[0004] The assembly gap is moved down to the lower part of the corresponding axial flow impeller. Since the centrifugal impeller is a high-pressure area and the axial flow impeller, especially the lower part of the axial flow impeller, is a low-pressure area during the water pumping process, it can avoid the high water pressure causing the water to flow through the assembly gap and leak out. At the same time, since the assembly gap is below the water level, the problem of gas inhalation through the assembly gap is also avoided, thereby improving the energy efficiency of the cleaning machine and ensuring the stable operation of the water flow system. However, since the clamping ring for the upper and lower and circumferential limit of the spray arm is still a common clamping ring structure in the prior art, it is matched with the spray arm through a simple snap-fit, and the rotational matching surface is small, there is a problem of unstable rotation of the spray arm; at the same time, although the assembly gap is moved down, when the water pressure is high, there will still be a problem of partial water leakage. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method for installing a spray arm of a cleaning machine, which can improve the rotation stability of the spray arm and reduce the leakage flow rate, in view of the current status of the prior art.

[0006] The technical solution adopted by the present invention to solve the above technical problems is:

[0007] A method for installing a spray arm of a cleaning machine, comprising a water pump and a spray arm arranged in the cleaning machine, wherein a water outlet and a water outlet sleeve extending upward around the water outlet are formed on the top wall of the water pump, a water inlet and a water inlet sleeve extending downward around the water inlet and inserted into the water outlet sleeve are formed on the bottom wall of the spray arm, the spray arm is rotatably constrained on the water pump through a first connecting member and a second connecting member; the first connecting member is sleeved on the outer periphery of the water inlet sleeve and the two rotate synchronously, the second connecting member is sleeved on the outer periphery of the first connecting member and the two form a mating surface that is pressed up and down and can rotatably fit, and the second connecting member is detachably locked on the water pump;

[0008] During assembly:

[0009] (1) Place the water inlet of the spray arm upward, and place the second connecting piece on the outer periphery of the water inlet sleeve and let it fall freely;

[0010] (2) placing the first connecting piece on the outer periphery of the water inlet sleeve and moving it downward to lock and connect the first connecting piece to the water inlet sleeve using the first limiting assembly;

[0011] (3) Place the first connecting member, the second connecting member, and the spray arm above the water pump with the water inlet facing downward, rotate the second connecting member, and lock it on the water pump using the second limit assembly;

[0012] In the assembled state, the upper end surface of the first connecting member and the inner top wall of the second connecting member form the matching surface, and the lower end surface of the first connecting member is arranged corresponding to the top of the water outlet jacket.

[0013] Preferably, the second connecting member includes a top wall and an annular wall extending downward from the edge of the top wall, and the second limiting assembly is arranged between the inner side of the annular wall and the top wall of the water pump. When assembled, the top wall, the annular wall and the top wall of the water pump of the second connecting member jointly enclose a surrounding cavity that surrounds the water outlet sleeve and the water inlet sleeve. The second connecting member is used to form an surrounding cavity that surrounds the rotating matching structure of the spray arm. On the one hand, it prevents residue from being retained in the assembly gap and affecting the rotation stability of the spray arm. On the other hand, it constrains the discharge of the spray arm in a relatively closed cavity. The pressure in the cavity is relatively stable and is less affected by the washing cavity, which is conducive to reducing the discharge flow, reducing the energy loss of the water flow, and maintaining a higher spray head and water pressure.

[0014] Preferably, a rotatable assembly gap is formed between the water inlet sleeve and the water outlet sleeve, and the lower surface of the first connector is arranged corresponding to the top edge of the water outlet sleeve and constitutes the leakage blocking surface of the assembly gap. With such a structure, dynamic blocking is performed by aligning at the leakage outlet, which is conducive to working together with the above-mentioned surrounding cavity to further reduce the leakage flow. In fact, after adopting the above-mentioned double leakage protection, it can be achieved that when the assembly gap is filled with water, basically no leakage occurs, and the water filled in the assembly gap plays a sealing role on the one hand, and on the other hand, plays a rotational lubrication role, so as to improve the rotational stability of the spray arm on the basis of satisfying small flow loss.

[0015] Preferably, a first supporting rib protrudes from the outer peripheral wall of the water inlet sleeve and can rotate with the inner wall of the water outlet sleeve. This structure can reduce the rotational matching area between the water inlet sleeve and the water outlet sleeve, reduce friction, and improve the smoothness of the rotation of the spray arm.

[0016] Preferably, the top wall of the spray arm on the inner side of the water outlet jacket forms a step for restricting the downward movement of the water inlet jacket.

[0017] Preferably, a mounting opening for the water inlet jacket to pass through is provided at the central portion of the top wall of the second connector, and a mounting ring extending downward from the edge of the mounting opening is provided on the inner top wall of the second connector, and the lower surface of the mounting ring is rotatably matched with the upper end surface of the first connector to form the matching surface. With such a structure, on the basis of forming a large-area rotating matching surface, possible rotation interference between the second connector and the first connector is eliminated, so as to ensure smooth relative rotation of the two.

[0018] Preferably, a second supporting rib extending vertically upward is provided on the inner peripheral wall of the first connecting member, the outer side of the second supporting rib is arranged close to the inner wall of the assembly ring, and the inner side is arranged at a distance from the outer wall of the water inlet jacket. This structure can radially limit the first connecting member and the second connecting member, thereby improving the rotational stability between the two.

[0019] Preferably, the second connecting member includes a first part and a second part connected up and down, the diameter of the first part is smaller than the diameter of the second part, the upper surface of the first part is arranged close to the lower surface of the spray arm, and the upper surface of the first part is convexly provided with annular ribs arranged along the periphery of the water inlet jacket. During the cleaning process, the spray arm may float up and down under the impact of water. The above structure can provide support for the spray arm and reduce the contact area between the two when the spray arm floats down and contacts with the second connecting member, thereby reducing friction and improving the smoothness of the rotation of the spray arm. The structure of the annular ribs provides a balancing force to the spray arm in the circumferential direction, which is conducive to the spray arm to adjust the rotation trajectory in time and maintain stability.

[0020] Preferably, a limiting rib of an L-shaped structure is provided on the outer peripheral wall of the water inlet jacket, and correspondingly, a limiting groove is provided on the side wall of the first connecting member for the limiting rib to be clamped from top to bottom and to form a limiting position as the water inlet jacket rotates circumferentially. The width of the vertical part of the limiting rib in the radial direction is smaller than the width of the transverse part in the radial direction, and the limiting groove is also an L-shaped structure, and the width of the vertical part of the L-shaped structure in the circumferential direction can allow the limiting rib to be clamped from top to bottom, and the transverse part of the L-shaped structure penetrates radially along the first connecting member for the transverse part of the limiting rib to be clamped therein, and a recessed notch for clamping the vertical part of the limiting rib is formed on the inner wall of the first connecting member at the end of the transverse part of the L-shaped structure. With the above structure, during assembly, the water inlet sleeve is inserted into the first connecting piece from top to bottom, the limiting rib is aligned with the vertical part of the L-shaped structure and enters the limiting groove, and then the first connecting piece is rotated to slide the transverse part of the limiting rib into the transverse part of the limiting groove, and the vertical part of the limiting rib is snapped into the notch. The locking direction is consistent with the rotation direction of the spray arm, so as to prevent the spray arm from loosening during rotation, thereby improving the locking reliability between the water inlet sleeve and the first connecting piece.

[0021] In the present invention, the friction coefficient of the first connecting member is smaller than that of the second connecting member, and the wear resistance of the second connecting member is greater than that of the first connecting member. Preferably, the first connecting member is made of PP-TD20 material, and the second connecting member is made of POM material. By adopting the above method, a large, low-friction coefficient mating surface can be maintained, thereby improving the rotation stability and smoothness of the spray arm.

[0022] Compared with the prior art, the advantages of the present invention are: the spray arm of the present invention is rotatably connected to the water pump through the first connecting member and the second connecting member. Since the first connecting member and the second connecting member adopt mating surfaces that press against each other and rotatably cooperate in the up and down directions, compared with the existing clamping ring cooperation method, the force cooperation surface is large and stable, which is beneficial to improving the rotation stability of the spray arm; at the same time, the first connecting member after assembly is always located at the top port of the water outlet sleeve. When the spray arm leaks due to high water pressure, the first connecting member can block the leakage, thereby reducing the leakage flow and reducing the fluid energy loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0024] Figure 2 for Figure 1 A cross-sectional view of

[0025] Figure 3 for Figure 1 Exploded diagram of

[0026] Figure 4is a schematic structural diagram of a first connecting member in an embodiment of the present invention;

[0027] Figure 5 Schematic diagram of the structure of the spray arm in an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below with reference to the accompanying drawings.

[0029] like Figures 1 to 5 As shown, the installation method of the spray arm of a washing machine in this embodiment mainly involves the assembly and installation between a water pump 1 and a spray arm 2 in a dishwasher adopting an open water flow system.

[0030] The water pump 1 and the spray arm 2 are both arranged in the washing chamber of the cleaning machine and are arranged near the bottom of the washing chamber. The top wall of the water pump 1 is provided with a water outlet 11 and a water outlet sleeve 12 extending upward around the water outlet 11, the bottom wall of the spray arm 2 is provided with a water inlet 21 and a water inlet sleeve 22 extending downward around the water inlet 21 and inserted into the water outlet sleeve 12, and the spray arm 2 is rotatably constrained on the water pump 1 through the first connecting member 3 and the second connecting member 4; the first connecting member 3 is sleeved on the outer periphery of the water inlet sleeve 22 and the two rotate synchronously, the second connecting member 4 is sleeved on the outer periphery of the first connecting member 3 and the two form a mating surface 100 that presses up and down and can rotatably match, and the second connecting member 4 is detachably locked on the water pump 1. In the assembled state, the upper end surface of the first connecting member 3 and the inner top wall of the second connecting member 4 form a mating surface 100, and the lower end surface of the first connecting member 3 is arranged corresponding to the top of the water outlet sleeve 22.

[0031] The second connecting member 4 includes a top wall 41 and an annular wall 42 extending downward from the edge of the top wall 41. In the assembled state, the top wall 41 and the annular wall 42 of the second connecting member 4 and the top wall of the water pump 1 jointly enclose a surrounding cavity 200 that surrounds the water outlet sleeve 12 and the water inlet sleeve 22. The second connecting member 4 is used to form the surrounding cavity 200 that surrounds the rotating matching structure of the spray arm 2. On the one hand, it prevents residues from being retained in the assembly gap and affecting the rotation stability of the spray arm 2. On the other hand, it constrains the discharge of the spray arm 2 in a relatively closed cavity. The pressure in the cavity is relatively stable and is less affected by the washing cavity, which is conducive to reducing the discharge flow, reducing the energy loss of the water flow, and maintaining a higher injection head and water pressure.

[0032] In this embodiment, a rotatable assembly gap 300 is formed between the water inlet sleeve 22 and the water outlet sleeve 12, and the lower surface of the first connecting member 3 is arranged corresponding to the top edge of the water outlet sleeve 12 and constitutes the leakage blocking surface of the assembly gap 300. With such a structure, dynamic blocking is performed by aligning at the leakage outlet, which is conducive to working together with the above-mentioned surrounding cavity 200 to further reduce the leakage flow. In fact, after adopting the above-mentioned double leakage protection, it can be achieved that when the assembly gap 300 is filled with water, basically no leakage occurs, and the water filled in the assembly gap 300 plays a sealing role on the one hand, and on the other hand, plays a rotational lubrication role, so as to improve the rotational stability of the spray arm on the basis of satisfying a small flow loss.

[0033] The outer peripheral wall of the water inlet jacket 22 protrudes with a first support rib 221 that can rotate with the inner wall of the water outlet jacket 12. This structure can reduce the rotational matching area between the water inlet jacket 22 and the water outlet jacket 12, reduce friction, and improve the smoothness of the rotation of the spray arm. The top wall of the spray arm 2 inside the water outlet jacket 12 constitutes a step 121 for restricting the downward movement of the water inlet jacket 22.

[0034] The central part of the top wall of the second connecting member 4 is provided with an assembly opening 43 for the water inlet jacket 22 to pass through, and the inner top wall of the second connecting member 4 is provided with an assembly ring 44 extending downward from the edge of the assembly opening 43, and the lower surface of the assembly ring 44 is rotatably matched with the upper end surface of the first connecting member 3 to form a matching surface 100. With such a structure, on the basis of forming a large-area rotating matching surface, the possible rotation interference between the second connecting member 4 and the first connecting member 3 is eliminated to ensure smooth relative rotation of the two.

[0035] A second supporting rib 31 extending vertically upward is provided on the inner circumferential wall of the first connecting member 3. The outer side of the second supporting rib 31 is arranged close to the inner wall of the assembly ring 44, and the inner side is arranged at a distance from the outer wall of the water inlet jacket 22. This structure can radially limit the first connecting member 3 and the second connecting member 4, thereby improving the rotational stability between the two.

[0036] The second connecting member 4 includes a first part 401 and a second part 402 connected up and down, the diameter of the first part 401 is smaller than the diameter of the second part 402, the upper surface of the first part 401 is arranged close to the lower surface of the spray arm 2, and the upper surface of the first part 401 is convexly provided with an annular rib 45 arranged along the periphery of the water inlet jacket 22. Since the spray arm 2 may float up and down under the impact of water during the cleaning process, the above structure can provide support for the spray arm 2 when the spray arm 2 floats down and contacts with the second connecting member 4, thereby reducing the contact area between the two, thereby reducing friction and improving the smoothness of the rotation of the spray arm 2. In addition, the structure of the annular rib gives the spray arm 2 a balancing force in the circumferential direction, which is conducive to the spray arm 2 to adjust the rotation trajectory in time and maintain stability.

[0037] In this embodiment, a limiting rib 222 of an L-shaped structure is provided on the outer peripheral wall of the water inlet jacket 22, and correspondingly, a limiting groove 32 is provided on the side wall of the first connecting member 3 for the limiting rib 222 to be clamped therein from top to bottom and to be limited as the water inlet jacket 22 rotates circumferentially. The width of the vertical portion 2221 of the limiting rib 222 in the radial direction is smaller than the width of the transverse portion 2222 in the radial direction, and the limiting groove 32 is also an L-shaped structure, and the width of the vertical portion 321 of the L-shaped structure in the circumferential direction can allow the limiting rib 222 to be clamped therein from top to bottom, and the transverse portion 322 of the L-shaped structure penetrates radially along the first connecting member 3 for the transverse portion 2222 of the limiting rib 222 to be clamped therein, and a recessed notch 33 for clamping the vertical portion 2222 of the limiting rib 222 is formed on the inner wall of the first connecting member 3 at the end of the transverse portion 322 of the L-shaped structure. With the above structure, during assembly, the water inlet sleeve 22 is inserted into the first connecting member 3 from top to bottom, the limiting rib 222 is aligned with the vertical part 321 of the L-shaped structure and enters the limiting groove 32, and then the first connecting member 3 is rotated to slide the transverse part 2222 of the limiting rib 222 into the transverse part of the limiting groove 32, and the vertical part 2221 of the limiting rib 222 is inserted into the notch 33. The locking direction is consistent with the rotation direction of the spray arm 2, so as to prevent the spray arm 2 from loosening during rotation, thereby improving the locking reliability between the water inlet sleeve 22 and the first connecting member 3.

[0038] In this embodiment, the friction coefficient of the first connecting member 3 is smaller than that of the second connecting member 4, and the wear resistance of the second connecting member 4 is greater than that of the first connecting member 3. In this embodiment, the first connecting member 3 is preferably made of PP-TD20 material, and the second connecting member 4 is made of POM material. In the above manner, a large, low friction coefficient mating surface can be maintained, thereby improving the rotation stability and smoothness of the spray arm.

[0039] When assembling the spray arm of this embodiment:

[0040] (1) Place the water inlet 21 of the spray arm 2 upward, and sleeve the second connecting member 4 around the outer periphery of the water inlet sleeve 22 and let it fall freely;

[0041] (2) The first connecting member 3 is placed on the outer periphery of the water inlet sleeve 22 and moved downward, and the first connecting member 3 is locked and connected with the water inlet sleeve 22 by using the first limiting assembly; the first limiting assembly is a matching structure of the limiting rib 222 and the limiting groove 32;

[0042] (3) Place the first connecting member 3, the second connecting member 4, and the spray arm 2 as a whole above the water pump 1, with the water inlet 21 facing downward, rotate the second connecting member 4 and lock it on the water pump 1 using the second limiting assembly; the second limiting assembly is a snap-fit ​​structure 400 between the inner side of the ring wall of the second connecting member 4 and the top wall of the water pump 1.

[0043] The spray arm 2 of the present embodiment is rotatably connected to the water pump 1 via the first connecting member 3 and the second connecting member 4. Since the first connecting member 3 and the second connecting member 4 adopt a mating surface 100 that presses against each other in the up and down directions and rotatably cooperates, compared with the existing clamping ring cooperation method, the force cooperation surface is large and stable, which is beneficial to improving the rotation stability of the spray arm 2; at the same time, the first connecting member 3 after assembly is always located at the top port of the water outlet sleeve 12 to form a leakage blocking surface. Combined with the surrounding cavity 200 structure formed by the second connecting member 4, when the spray arm 2 has a large water pressure and leakage occurs, the leakage can be blocked, thereby reducing the leakage flow and reducing the fluid energy loss.

[0044] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. A method for installing a spray arm of a cleaning machine, comprising a water pump (1) and a spray arm (2) arranged in the cleaning machine, wherein a water outlet (11) and a water outlet sleeve (12) extending upward around the water outlet (11) are formed on the top wall (41) of the water pump (1), and a water inlet (21) and a water inlet sleeve (22) extending downward around the water inlet (21) and inserted into the water outlet sleeve (12) are formed on the bottom wall of the spray arm (2), wherein the method is characterized in that: The spray arm (2) is rotatably constrained on the water pump (1) by a first connecting member (3) and a second connecting member (4); the first connecting member (3) is sleeved on the outer periphery of the water inlet sleeve (22) and the two rotate synchronously, the second connecting member (4) is sleeved on the outer periphery of the first connecting member (3) and the two form a matching surface (100) that presses up and down and can rotatably match, and the second connecting member (4) is detachably locked on the water pump (1); During assembly: (1) Place the water inlet (21) of the spray arm (2) upward, and sleeve the second connecting piece (4) around the outer periphery of the water inlet sleeve (22) and allow it to fall freely; (2) The first connecting member (3) is placed on the outer periphery of the water inlet sleeve (22) and moved downward, and the first connecting member (3) is locked and connected with the water inlet sleeve (22) by using the first limiting assembly; (3) placing the first connecting member (3), the second connecting member (4) and the spray arm (2) above the water pump (1), with the water inlet (21) facing downward, rotating the second connecting member (4) and locking it to the water pump (1) using the second limit assembly; In the assembled state, the upper end surface of the first connecting member (3) and the inner top wall (41) of the second connecting member (4) form the matching surface (100), and the lower end surface of the first connecting member (3) is arranged corresponding to the top of the water outlet jacket (12); The second connecting member (4) comprises a top wall (41) and an annular wall (42) extending downward from the edge of the top wall (41); the second limiting assembly is arranged between the inner side of the annular wall (42) and the top wall of the water pump (1); in the assembled state, the top wall (41) and the annular wall (42) of the second connecting member (4) and the top wall of the water pump (1) jointly enclose a surrounding cavity (200) enclosing the water outlet sleeve (12) and the water inlet sleeve (22).

2. The method for installing a spray arm of a cleaning machine according to claim 1, characterized in that: An assembly gap (300) capable of rotationally fitting is formed between the water inlet sleeve (22) and the water outlet sleeve (12); the lower surface of the first connecting member (3) is arranged corresponding to the top edge of the water outlet sleeve (12) and constitutes a leakage sealing surface of the assembly gap (300).

3. The method for installing a spray arm of a cleaning machine according to claim 2, characterized in that: A first supporting rib (221) protrudes from the outer peripheral wall of the water inlet jacket (22) and is rotatably matched with the inner wall of the water outlet jacket (12).

4. The method for installing a spray arm of a cleaning machine according to claim 2, characterized in that: The top wall (41) of the spray arm (2) inside the water outlet jacket (12) forms a step (121) for restricting the downward movement of the water inlet jacket (22).

5. The method for installing a spray arm of a cleaning machine according to claim 1, characterized in that: A mounting opening (43) for the water inlet jacket (22) to pass through is provided at the central portion of the top wall (41) of the second connecting member (4), and a mounting ring (44) extending downward from the edge of the mounting opening (43) is provided on the inner top wall (41) of the second connecting member (4), and the lower surface of the mounting ring (44) is rotatably matched with the upper end surface of the first connecting member (3) to form the matching surface (100).

6. The method for installing a spray arm of a cleaning machine according to claim 5, characterized in that: A second supporting rib (31) extending vertically upward is provided on the inner peripheral wall of the first connecting member (3), the outer side of the second supporting rib (31) being arranged close to the inner wall of the assembly ring (44) and the inner side being arranged spaced apart from the outer wall of the water inlet jacket (22).

7. The method for installing a spray arm of a cleaning machine according to claim 1, characterized in that: The second connecting member (4) comprises a first part (401) and a second part (402) connected to each other from top to bottom, the diameter of the first part (401) is smaller than the diameter of the second part (402), the upper surface of the first part (401) is arranged close to the lower surface of the spray arm (2), and the upper surface of the first part (401) is provided with an annular rib (45) arranged along the periphery of the water inlet jacket (22).

8. The method for installing a spray arm of a cleaning machine according to any one of claims 1 to 7, characterized in that: The outer peripheral wall of the water inlet jacket (22) is provided with a limiting rib (222) in an L-shaped structure, and correspondingly, the side wall of the first connecting member (3) is provided with a limiting groove (32) in which the limiting rib (222) is clamped from top to bottom and forms a limiting position as the water inlet jacket (22) rotates circumferentially.

9. The method for installing a spray arm of a cleaning machine according to claim 8, characterized in that: The radial width of the vertical portion of the limiting rib (222) is smaller than the radial width of the transverse portion; the limiting groove (32) is also an L-shaped structure; the circumferential width of the vertical portion of the L-shaped structure is sufficient for the limiting rib (222) to be inserted therein from top to bottom; the transverse portion of the L-shaped structure penetrates radially along the first connecting member (3) so that the transverse portion of the limiting rib (222) can be inserted therein; and a recessed notch (33) for inserting the vertical portion of the limiting rib (222) is formed on the inner wall of the first connecting member (3) at the end of the transverse portion of the L-shaped structure.

10. The method for installing a spray arm of a cleaning machine according to any one of claims 1 to 7, characterized in that: The friction coefficient of the first connecting member (3) is smaller than that of the second connecting member (4), and the wear resistance of the second connecting member (4) is greater than that of the first connecting member (3).

11. The method for installing a spray arm of a cleaning machine according to claim 10, characterized in that: The first connecting piece (3) is made of PP-TD20 material, and the second connecting piece (4) is made of POM material.

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