Spray arm device of dishwasher

Abstract

The present invention discloses a dishwasher spray arm assembly, comprising: a main spray arm having a first cavity, a water inlet, and a plurality of first spray holes, the first cavity being connected to the water inlet and each of the first spray holes; a secondary spray arm rotatably connected to at least one end of the main spray arm, the secondary spray arm having a second cavity and a plurality of second spray holes, each of the second spray holes being connected to the first cavity via the second cavity; and a transmission assembly, the secondary spray arm being connected to the main spray arm via the transmission assembly to enable the secondary spray arm to reciprocate within a set range. The spray arm assembly of the present invention has a simple structure and can form a four-arc outward-swinging spray area, so that even the four corners of a square are adequately sprayed, effectively improving the cleaning effect.

Description

Technical Field

[0001] The present invention relates to the technical field of dishwashers, and in particular to a spray arm device of a dishwasher. Background Art

[0002] While the spray arm structures of dishwashers currently on the market vary, they generally feature a circular spray trajectory. However, the cleaning chambers of existing dishwashers are generally square. Consequently, with only a circular trajectory within the square chamber, there are inevitably blind spots around the perimeter that don't spray, impacting the cleaning effect. Summary of the Invention

[0003] The present invention aims to solve, at least to a certain extent, one of the problems existing in the existing related technologies. To this end, the present invention proposes a spray arm device for a dishwasher, which has a simple structure and can form four arc-shaped outward-swinging spray areas, so that the four corner areas of the square can also be fully sprayed, effectively improving the cleaning effect.

[0004] According to the above-mentioned spray arm device of a dishwasher, it is implemented through the following technical solutions:

[0005] A spray arm device for a dishwasher comprises: a main spray arm having a first cavity, a water inlet, and a plurality of first spray holes, wherein the first cavity is respectively connected to the water inlet and each of the first spray holes; an auxiliary spray arm rotatably connected to at least one end of the main spray arm, the auxiliary spray arm having a second cavity and a plurality of second spray holes, each of the second spray holes being connected to the first cavity via the second cavity; and a transmission assembly, wherein the auxiliary spray arm is connected to the main spray arm via the transmission assembly so that the auxiliary spray arm can swing back and forth within a set range.

[0006] In some embodiments, the transmission assembly includes: a fixed gear, which is mounted outside the water inlet and the main spray arm can rotate relative to the fixed gear; a movable gear, which is rotatably connected to the main spray arm and meshes with the fixed gear; and a transmission rod, through which the auxiliary spray arm is connected to the movable gear.

[0007] In some embodiments, the transmission ratio of the fixed gear to the fixed gear is 1:2.

[0008] In some embodiments, the transmission rod includes a transverse section, which is disposed below the main spray arm and has one end pivotally connected to the movable gear and the other end pivotally connected to one end of the auxiliary spray arm.

[0009] In some embodiments, the transmission rod also includes a vertical section, which is arranged outside the side wall of the main spray arm and is gap-fitted with the main spray arm. The end of the transverse section away from the movable gear is pivotally connected to one end of the auxiliary spray arm through the vertical section.

[0010] In some embodiments, the transverse section is arranged in a straight line or in a stepped manner, and / or the transverse section is arranged at an obtuse angle to the vertical section.

[0011] In some embodiments, a convex edge extending outward is fixedly provided on the upper side of one end of the transmission rod close to the auxiliary spray arm, and the convex edge is located outside the side wall of the main spray arm and is pivotally connected to the auxiliary spray arm; a positioning portion extending downward is fixedly provided at the eccentric point of the movable gear, and the end of the transmission rod close to the movable gear is pivotally connected to the positioning portion.

[0012] In some embodiments, the transmission assembly further includes a first buckle, the main spray arm is provided with a mounting groove opening toward the movable gear, and the movable gear is rotatably connected to the mounting groove via the first buckle.

[0013] In some embodiments, a spray arm support is further included, the main spray arm is rotatably connected to the spray arm support, the spray arm support is provided with a water flow channel connected to the water inlet, and the fixed gear of the transmission assembly is fixedly connected to the spray arm support.

[0014] In some embodiments, a spray arm joint is further included, one end of which is inserted into the water inlet and fixedly connected to the main spray arm, and the other end is rotatably inserted into the water flow channel, and the water flow channel is connected to the first cavity through the spray arm joint.

[0015] In some embodiments, an outer side wall of the spray arm joint is circumferentially provided with an outwardly extending annular flange, and the annular flange is clamped between the spray arm support and the water inlet.

[0016] In some embodiments, a limiting structure is provided between the fixed gear and the spray arm support.

[0017] In some embodiments, a water outlet connected to the first cavity is provided at a position of the main spray arm corresponding to the auxiliary spray arm, and a second pressure buckle is connected and fixed to the water outlet. The auxiliary spray arm is rotatably connected to the main spray arm through the second pressure buckle, and the second cavity is connected to the water outlet through the center hole of the second pressure buckle.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] The spray arm device of the present invention is connected to a secondary spray arm through rotation of at least one end of the main spray arm. The secondary spray arm is connected to the main spray arm through a transmission assembly, so that during the rotation of the main spray arm, the secondary spray arm swings back and forth within a set range. The structure is simple and can form a four-arc outward-swinging spray area, so that the four corner areas of the square can also be fully sprayed, effectively improving the cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 1 is a schematic structural diagram of the spray arm device in Example 1 of the present invention;

[0021] Figure 2 is an exploded view of the spray arm device in Example 1 of the present invention;

[0022] Figure 3 is a bottom view of the spray arm device in Example 1 of the present invention;

[0023] Figure 4 Figure 3 Cross-sectional view in the AA direction;

[0024] Figure 5 Schematic diagram of the structure of the main spray arm in Example 1 of the present invention;

[0025] Figure 6 Schematic diagram of the structure of the auxiliary spray arm in Example 1 of the present invention;

[0026] Figure 7 1 is a schematic structural diagram of the transmission rod in Example 1 of the present invention;

[0027] Figure 8 1 is a transmission schematic diagram of the spray arm device in Example 1 of the present invention;

[0028] Figure 9 Schematic diagram of the motion trajectory of the second spray holes on the outermost sides of the two auxiliary spray arms in Example 1 of the present invention;

[0029] Figure 10 2 is a schematic structural diagram of the spray arm device in Example 2 of the present invention;

[0030] Figure 11 It is a structural schematic diagram of the transmission rod in Example 2 of the present invention.

[0031] In the figure: 1-main spray arm, 11-first cavity, 121-water inlet, 122-water outlet, 13-first spray hole, 14-mounting groove; 2-auxiliary spray arm, 21-second cavity, 22-second spray hole, 23-water outlet, 24-clamping part; 3-transmission assembly, 31-fixed gear, 32-moving gear, 321-positioning part, 322-through hole, 33-transmission rod, 331-transverse section, 3311-second mounting hole, 3312-guide part, 332-vertical section, 3321-convex edge, 3322-first mounting hole, 34-first buckle; 4-spray arm support, 41-water flow channel; 5-spray arm joint, 51-annular flange; 61-second buckle, 611-hook, 62-sealing member; 71-clamping part, 72-boss. DETAILED DESCRIPTION

[0032] The following examples illustrate the present invention, but the present invention is not limited to these examples. Modifications to the specific embodiments of the present invention or equivalent replacements of some technical features without departing from the spirit of the present invention should be included in the scope of the technical solution claimed in the present invention.

[0033] Example 1

[0034] refer to Figure 1-5 This embodiment provides a spray arm device for a dishwasher, including a main spray arm 1, two auxiliary spray arms 2, and a transmission assembly 3. The main spray arm 1 has a first cavity 11, a water inlet 121, two water outlets 122, and a plurality of first spray holes 13 connected to the first cavity 11. The water inlet 121 is arranged at the center of the bottom of the main spray arm 1 and connected to the first cavity 11. The two water outlets 122 are respectively arranged on the left and right sides of the top of the main spray arm 1 and connected to the first cavity 11.

[0035] The two auxiliary spray arms 2 are rotatably connected to opposite ends of the top of the main spray arm 1. Each auxiliary spray arm 2 has a second cavity 21 and multiple second spray holes 22 connected to the second cavity 2. The second cavity 21 of each auxiliary spray arm 2 is connected to the first cavity 11 through a corresponding water outlet 122. The transmission assembly 3 is set at the bottom of the main spray arm 1 and located between the two auxiliary spray arms 2. Each auxiliary spray arm 2 is connected to the main spray arm 1 through the transmission assembly 3, so that when the main spray arm 1 rotates, the auxiliary spray arm 2 swings back and forth within the set range [a1, a2]. See Figure 8 In this way, a four-arc outward-swinging spraying area can be formed, so that the four corner areas of the square can also be fully sprayed, effectively improving the cleaning effect.

[0036] refer to Figure 2-5 A second pressing buckle 61 is fixedly connected to the water outlet 122 of the main spray arm 1. The auxiliary spray arm is rotatably connected to the main spray arm 1 via the second pressing buckle 61. The second cavity 21 is connected to the water outlet 122 via the center hole of the second pressing buckle 61. Optionally, a water opening 23 is provided at the center of the bottom of the auxiliary spray arm 1, connecting to the second cavity 21. The second pressing buckle 61 is disposed within the water opening 23 and the water outlet 122.

[0037] A limiting structure is provided between the lower end of the second pressing buckle 61 and the water outlet 122, so that the second pressing buckle 61 is reliably connected and fixed to the main spray arm 1 through the limiting structure, that is, the second pressing buckle is fixed to the main spray arm to form an integral body. The limiting structure of this embodiment may include a locking portion 71 and a boss 72 that are rotatably engaged with each other. The locking portion 71 is provided on the peripheral wall of the water outlet 122, and the boss 72 is provided at the lower end of the side wall of the second pressing buckle 61. Of course, the positions of the locking portion 71 and the boss 72 can also be interchanged. In other embodiments, other locking structures or threaded structures can be used to replace the matching locking portion 71 and boss 72.

[0038] A plurality of hooks 611 extending upward and arranged at intervals in the circumferential direction are fixedly provided at the upper end of the second buckle 61. Each hook 611 hooks the upper edge of the water outlet 23 so that the auxiliary spray arm 2 is reliably connected to the main spray arm and the auxiliary spray arm 2 can rotate relative to the second buckle 61 and the main spray arm.

[0039] In order to further improve the sealing between the main spray arm and the auxiliary spray arm, and to reduce the friction between the main spray arm and the auxiliary spray arm, a seal 62 is provided on the outer sleeve of the second pressing buckle 61. The seal 62 is sandwiched between the auxiliary spray arm and the main spray arm 1. Figure 4 .

[0040] refer to Figure 1-5 The bottom of the main spray arm 1 is provided with two mounting grooves 14 located on opposite sides of the water inlet 121. Each mounting groove 14 is configured to fit the movable gear 32 of the transmission assembly 3. The bottom of each auxiliary spray arm 2 is provided with a clamping portion 24 located outside the water outlet 23. This clamping portion 24 can be a claw or a hook, which is used to hook the transmission rod 33 of the transmission assembly 3.

[0041] The transmission assembly 3 comprises a fixed gear 31, two movable gears 32, and two transmission rods 33. The fixed gear 31 is located at the bottom of the main spray arm 1 and fits over the water inlet 121, allowing the main spray arm 1 to rotate relative to the fixed gear 31. The two movable gears 32 are located in two mounting slots 14 of the main spray arm 1. Each movable gear 32 is rotatably connected to the main spray arm 1 and meshes with the fixed gear 31. The transmission ratio between each fixed gear 31 is 2:1. Each auxiliary spray arm 2 is connected to the adjacent movable gear 32 via a transmission rod 33.

[0042] In this embodiment, the fixed gear 31, the movable gear 32 and the transmission rod 33 can be regarded as a simplified crank rocker motion structure. Figure 8 A connection point B is formed between the transmission rod 33 and the movable gear 32, and a line connecting the center point A of the movable gear 32 and the connection point B forms a crank AB; a connection point C is formed between the transmission rod 33 and the auxiliary spray arm 2, and a line connecting the center point D of the auxiliary spray arm 2 and the connection point C forms a rocker CD, and the transmission rod 33 (i.e., the line connecting the connection point B and the connection point C) forms a connecting rod BC, and the rotation range of the rocker CD is the set interval [a1, a2], that is, the rocker CD swings back and forth within the set interval [a1, a2].

[0043] For example, if the transmission ratio of fixed gear 31 to fixed gear 31 is 2:1, when main spray arm 1 rotates one revolution, auxiliary spray arm 2 on one side swings back and forth twice within the set range [a1, a2]. When auxiliary spray arm 2 rotates to position a1, the outermost side of its long axis is farthest from the vertical center axis d1d2 of main spray arm 1. When auxiliary spray arm 2 rotates to position a2, the outermost side of its short axis is farthest from the vertical center axis d1d2 of main spray arm 1.

[0044] refer to Figure 1-4 The movable gear 32 is rotatably connected to the mounting slot 14 via a first snap 34. A through-hole 322 is provided at the center of the movable gear 32 for the first snap 34 to pass through. The first snap 34 extends from bottom to top through the through-hole and engages with the mounting slot 14. In this embodiment, the first snap 34 is screwed onto the mounting slot 14 via a retaining structure. Specifically, the first snap 34 is connected and fixed to the mounting slot 14 of the main spray arm via a rotating engagement portion 71 and a boss 72. At this point, the first snap 34 securely connects the movable gear 32 to the main spray arm, and the movable gear 32 can rotate relative to the first snap 34 and the main spray arm 1. Furthermore, a downwardly extending positioning portion 321 is fixedly provided at an eccentric portion of the movable gear 32. The positioning portion 321 can be a claw or a hook, and is used to hook onto the end of the transmission rod 33 near the movable gear 32, thereby pivoting the transmission rod 33 onto the positioning portion 321.

[0045] Each transmission rod 33 is loosely matched with the main spray arm 1 to form a clearance area between the transmission rod 33 and the main spray arm 1 to prevent the transmission rod 33 from interfering with the rotation of the main spray arm 1. Figure 3-4 and Figure 7 The transmission rod 33 includes a vertical section 332, which is positioned below the main spray arm 1 and has a clearance fit with the main spray arm 1. One end of the vertical section 332 is pivotally connected to a nearby driven gear, and the other end is pivotally connected to one end of the nearby auxiliary spray arm 2. In this embodiment, the transmission rod 33 also includes a vertical section 332. The free end of the transverse section 331 is positioned below the main spray arm 1 and is eccentrically pivotally connected to the driven gear 32. The fixed end of the transverse section 331 is positioned outside the main spray arm 1, with a gap between the transverse section 331 and the bottom of the main spray arm 1. The vertical section 332 is positioned outside the side wall of the main spray arm 1 and has a clearance fit with the main spray arm 1. The fixed end of the vertical section 332 is fixedly connected to the fixed end of the transverse section 331, and the free end of the vertical section 332 is pivotally connected to the auxiliary spray arm 2.

[0046] Optionally, the transverse section 331 is arranged in a stepped configuration, i.e., the fixed end and free end of the transverse section 331 are arranged in a stepped configuration. In this embodiment, the top surface of the fixed end of the transverse section 331 is higher than the top surface of the free end of the transverse section 331, thereby facilitating the connection and fixation of the free end of the transverse section 331 with the movable gear 32 while simultaneously ensuring a low vertical height of the transmission rod. Of course, the top surface of the fixed end of the transverse section 331 can also be designed to be lower than the top surface of the free end of the transverse section 331, or the transverse section 331 can be designed to be in a straight line.

[0047] The vertical section 332 and the transverse section 331 are arranged at an obtuse angle, that is, the angle θ between the vertical section 332 and the transverse section 331 is greater than 90° and less than 180°, and the angle θ is preferably 133±30°.

[0048] A second mounting hole 3311 is provided at one end of the transmission rod 33 close to the movable gear 32 (i.e., at the free end of the transverse section 331), which is engaged with the positioning portion 321. The positioning portion 321 on the movable gear 32 is passed through the second mounting hole 3311 from top to bottom and hooks the lower edge of the second mounting hole 3311, so that the transmission rod 33 is reliably connected to the movable gear 32 through the matching second mounting hole 3311 and the positioning portion 321, ensuring that when the movable gear 32 rotates along the periphery of the fixed gear 31, it synchronously drives the transmission rod 33 to move.

[0049] An outwardly extending flange 3321 is fixedly mounted on the upper side of one end of the transmission rod 33 near the auxiliary spray arm 2 (i.e., the upper side of the free end of the vertical section 332). The flange 3321 is located outside the side wall of the main spray arm 1 and is pivotally connected to the clamping portion 24 on the auxiliary spray arm 2. Specifically, the flange 3321 defines a first mounting hole 3322 for the clamping portion 24 to pass through. The clamping portion 24 passes through the first mounting hole 3322 from top to bottom and hooks onto the lower edge of the first mounting hole 3322. Through the mating first mounting hole 3322 and the clamping portion 24, the transmission rod 33 is securely connected to the auxiliary spray arm 2, ensuring that the transmission rod 33 can drive the auxiliary spray arm to swing back and forth within a set range.

[0050] refer to Figure 1-4 The spray arm device also includes a spray arm support 4, to which the main spray arm 1 is rotatably connected. The spray arm support 4 is provided with a water flow channel 41 communicating with the water inlet 121. The fixed gear 31 of the transmission assembly 3 is sleeved outside the spray arm support 4 and is fixedly connected to the spray arm support 4, so that the fixed gear 31 is connected and fixed to the spray arm support 4 to form an integral unit. At this time, the main spray arm 1 is able to rotate relative to the spray arm support 4 and the fixed gear 31. In this embodiment, a limiting structure is provided between the outer wall of the spray arm support 4 and the center hole wall of the fixed gear 31. The limiting structure includes a locking portion 71 and a boss 72 that cooperate and rotate to engage with each other, so that the fixed gear 31 is securely connected and fixed to the spray arm support 4 through the cooperating locking portion 71 and the boss 72.

[0051] refer to Figure 1-4 The spray arm device also includes a spray arm joint 5, one end of which is inserted into the water inlet 121 and fixedly connected to the main spray arm 1, and the other end is rotatably inserted into the water flow channel 41. The water flow channel 41 is connected to the first cavity 11 through the spray arm joint 5. Specifically, the lower end of the spray arm joint 5 is connected to the lower end of the water flow channel 41, and the upper end of the spray arm joint 5 is directly connected to the first cavity 11, or the upper end of the spray arm joint 5 is connected to the first cavity 11 through the water inlet 121. Thus, the main spray arm 1 is reliably rotatably connected to the spray arm support 4 through the spray arm joint 5. In this embodiment, the upper end of the spray arm joint 5 is connected and fixed to the peripheral wall of the water inlet 121 by a limiting structure. An outwardly extending annular flange 51 is circumferentially provided in the middle of the outer wall of the spray arm joint 5. The annular flange 51 is sandwiched between the spray arm support 4 and the water inlet 121.

[0052] refer to Figure 3 and Figure 8 , set the starting position, when the main spray arm 1 is in the horizontal or vertical position, the auxiliary spray arms 2 on both sides are perpendicular to the main spray arm 1, and the two movable gears 32 rotate in the same direction. Since the gear ratio of the fixed gear 31 to the movable gear 32 is 2:1, the phase difference between the movement trajectories of the auxiliary spray arms 2 on both sides is 90°. Figure 9 The outermost trajectory of the long axis of auxiliary spray arm 2 on one side is b21, and the outermost trajectory of the short axis is the dashed line b11. The outermost trajectory of the long axis of auxiliary spray arm 2 on the other side is b22, and the outermost trajectory of the short axis is the dashed line b12. Therefore, the phase difference between b12 and b11 is 90°, and the phase difference between b21 and b22 is also 90°. As can be seen, the spray arm assembly forms a four-arc outward-swinging spray area, achieving a square four-corner spray pattern.

[0053] Example 2

[0054] refer to Figure 10-11 The difference between this embodiment and Example 1 lies in the structure of the transmission rod 33. In this embodiment, the transmission rod 33 comprises only a transverse section 331, which is preferably in a straight line, but can also be arranged in a stepped manner. The transverse section 331 is located below the main spray arm 1 and spaced apart from the main spray arm. Second mounting holes 3311 are provided at opposite ends of the transverse section 331. The positioning portion 321 on the movable gear 32 extends downward through the second mounting hole 3311 located adjacent thereto and is pivotally connected to the transverse section 331. The bottom of the auxiliary spray arm 2 is provided with a downwardly extending clamping portion 24 located outside the side wall of the main spray arm. The clamping portion 24 extends downward through the second mounting hole 3311 located adjacent thereto and is pivotally connected to the transverse section 331.

[0055] In order to facilitate the rapid insertion of the positioning portion 321 or the clamping portion 24 into the second mounting hole 3311, the transverse section 331 is provided with a guide portion 3312 located on the outer side of the upper end surface of the second mounting hole 3311. The number of the guide portions 3312 can be two or more, and all the guide portions 3312 are arranged at intervals along the circumferential direction of the second mounting hole 3311.

[0056] It can be seen that the movable gear 32 is connected to the auxiliary spray arm 2 through the transverse section 331, ensuring that the auxiliary spray arm 2 swings back and forth within the set range.

[0057] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. A spray arm device for a dishwasher, characterized in that: include: A main spray arm (1) comprises a first cavity (11), a water inlet (121) and a plurality of first spray holes (13), wherein the first cavity (11) is respectively connected to the water inlet (121) and each of the first spray holes (13); an auxiliary spray arm (2) rotatably connected to at least one end of the main spray arm (1), the auxiliary spray arm (2) having a second cavity (21) and a plurality of second spray holes (22), each of the second spray holes (22) being connected to the first cavity (11) via the second cavity (21); A transmission assembly (3), wherein the auxiliary spray arm (2) is connected to the main spray arm (1) via the transmission assembly (3), so that the auxiliary spray arm (2) can swing back and forth within a set range; The transmission assembly (3) comprises: A fixed gear (31) is mounted outside the water inlet (121), and the main spray arm (1) is capable of rotating relative to the fixed gear (31); A movable gear (32) rotatably connected to the main spray arm (1) and meshing with the fixed gear (31); A transmission rod (33), wherein the auxiliary spray arm (2) is connected to the movable gear (32) via the transmission rod (33); A connection point B is formed between the transmission rod (33) and the movable gear (32), and a line connecting the center point A of the movable gear (32) and the connection point B forms a crank AB; a connection point C is formed between the transmission rod (33) and the auxiliary spray arm (2), and a line connecting the center point D of the auxiliary spray arm (2) and the connection point C forms a rocker CD, and the transmission rod (33) forms a connecting rod BC.

2. The spray arm device of a dishwasher according to claim 1, characterized in that: The transmission ratio between the fixed gear (31) and the movable gear (32) is 1:

2.

3. The spray arm device of a dishwasher according to claim 1, characterized in that: The transmission rod (33) comprises a transverse section (331), which is arranged below the main spray arm (1), and has one end pivotally connected to the movable gear (32) and the other end pivotally connected to one end of the auxiliary spray arm (2).

4. The spray arm device of a dishwasher according to claim 3, characterized in that: The transmission rod (33) further comprises a vertical section (332), the vertical section (332) being arranged outside the side wall of the main spray arm (1) and being clearance-matched with the main spray arm (1), and the end of the transverse section (331) away from the movable gear (32) being pivotally connected to one end of the auxiliary spray arm (2) via the vertical section (332).

5. The spray arm device of a dishwasher according to claim 4, characterized in that: The transverse section (331) is arranged in a straight line or in a stepped manner, and / or the transverse section (331) and the vertical section (332) are arranged at an obtuse angle.

6. A spray arm device for a dishwasher according to any one of claims 1 to 4, characterized in that: A convex edge (3321) extending outward is fixedly provided on the upper side of one end of the transmission rod (33) close to the auxiliary spray arm (2); the convex edge (3321) is located outside the side wall of the main spray arm (1) and is pivotally connected to the auxiliary spray arm (2); A positioning portion (321) extending downward is fixedly provided at an eccentric position of the movable gear (32), and one end of the transmission rod (33) close to the movable gear (32) is pivotally connected to the positioning portion (321).

7. The spray arm device of a dishwasher according to claim 1, characterized in that: The transmission assembly (3) further comprises a first pressing buckle (34), the main spray arm (1) is provided with a mounting groove (14) opening toward the movable gear (32), and the movable gear (32) is rotatably connected to the mounting groove (14) via the first pressing buckle (34).

8. The spray arm device of a dishwasher according to claim 1, characterized in that: It also includes a spray arm support (4), the main spray arm (1) is rotatably connected to the spray arm support (4), the spray arm support (4) is provided with a water flow channel (41) connected to the water inlet (121), and the fixed gear (31) of the transmission assembly (3) is fixedly connected to the spray arm support (4).

9. The spray arm device of a dishwasher according to claim 8, characterized in that: It also includes a spray arm joint (5), one end of which is inserted into the water inlet (121) and fixedly connected to the main spray arm (1), and the other end of which is rotatably inserted into the water flow channel (41), and the water flow channel (41) is connected to the first cavity (11) through the spray arm joint (5).

10. The spray arm device of a dishwasher according to claim 9, characterized in that: An outwardly extending annular flange (51) is circumferentially provided on the outer side wall of the spray arm joint (5), and the annular flange (51) is sandwiched between the spray arm support (4) and the water inlet (121).

11. The spray arm device of a dishwasher according to claim 8, characterized in that: A limiting structure is provided between the fixed gear (31) and the spray arm support (4).

12. The spray arm device of a dishwasher according to claim 1, characterized in that: The main spray arm (1) is provided with a water outlet (122) communicating with the first cavity (11) at a position corresponding to the auxiliary spray arm, and a second pressing buckle (61) is connected and fixed to the water outlet (122). The auxiliary spray arm is rotatably connected to the main spray arm (1) via the second pressing buckle (61), and the second cavity (21) is communicated with the water outlet (122) via a central hole of the second pressing buckle (61).

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