Spray arm assembly and dishwasher

Abstract

The utility model discloses a kind of spray arm assembly and dishwasher, spray arm assembly includes: multiple spray arms, including first spray arm and second spray arm, the first spray arm has first runner and first spray hole, the first runner is communicated with the first spray hole, the first spray arm is driven and rotates around first rotation axis by the first spray hole, the second spray arm has second runner and second spray hole, the second runner is communicated with the second spray hole, the second spray arm is rotatable around second rotation axis;Transmission assembly, transmission connection the first spray arm and the second spray arm, the first spray arm is driven the second spray arm rotation by the transmission assembly, the rotational speed of the first spray arm is different with the rotational speed of the second spray arm.Spray arm assembly according to the utility model embodiment, the combination of fast washing and slow washing can be realized, improve the washing effect to tableware, and reduce the risk of spray arm stall, improve the stability of spray arm assembly to wash tableware.

Description

Technical Field

[0001] This utility model relates to the field of dishwasher technology, and more specifically, to a spray arm assembly and a dishwasher. Background Technology

[0002] As living standards improve, dishwashers, which free up your hands, are gradually becoming a standard feature of quality living. Compared with traditional hand washing, dishwashers have advantages such as better cleaning, sterilization, water saving, and labor saving. Household dishwashers generally use a spray-type washing method. Driven by a washing pump, water flows through rotating spray arms to rinse the surface of the dishes. The cleaning effect is closely related to the design of the spray arms.

[0003] In related technologies, if the spray arm rotates too fast, the water flow from the spray arm will be unstable, the continuous impact time on the same position of the tableware will be too short, the rinsing effect will be poor, and the cleaning effect on the tableware will be poor. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a spray arm assembly that combines fast and slow washing, making the water flow from the spray arm more stable, providing a longer continuous impact time on the same position of the tableware, resulting in better rinsing and cleaning effects.

[0005] Another objective of this invention is to provide a dishwasher having the aforementioned spray arm assembly.

[0006] A spray arm assembly according to an embodiment of the present invention includes: a plurality of spray arms, the plurality of spray arms including a first spray arm and a second spray arm, the first spray arm having a first flow channel and a first spray hole, the first flow channel communicating with the first spray hole, the first spray arm being driven by the first spray hole and rotating about a first rotation axis, the second spray arm having a second flow channel and a second spray hole, the second flow channel communicating with the second spray hole, the second spray arm being rotatable about a second rotation axis; and a transmission assembly, the transmission assembly drivingly connecting the first spray arm and the second spray arm, the first spray arm driving the second spray arm to rotate through the transmission assembly, the rotational speed of the first spray arm being different from the rotational speed of the second spray arm.

[0007] According to the embodiments of the present invention, the spray arm assembly can combine fast washing and slow washing by using a first spray arm and a second spray arm with different rotation speeds. The fast washing increases the rinsing frequency of the tableware as a whole, while the slow washing extends the continuous impact time on any part of the tableware, thus improving the cleaning effect. At the same time, by utilizing the transmission characteristics of the transmission component, the risk of the slower-rotating spray arm stopping is greatly reduced, and the rotational stability of the first and second spray arms is improved, thereby improving the stability of the spray arm assembly in rinsing the tableware.

[0008] In addition, the spray arm assembly according to the above embodiments of the present invention may also have the following additional technical features: According to some embodiments of this utility model, the transmission component is a speed reducer, the input end of the speed reducer is connected to the first spray arm, and the output end of the speed reducer is connected to the second spray arm, so that the rotational speed of the first spray arm is greater than the rotational speed of the second spray arm.

[0009] According to some embodiments of the present invention, the first rotation axis is coaxial with the second rotation axis, the reducer is a first reducer, the first reducer includes one or more planetary gear sets meshing sequentially, the planetary gear set includes a sun gear, a ring gear and at least one planet gear, wherein the sun gear in the planetary gear set at the input end is fixedly connected to the first spray arm, the planet gear is rotatably disposed on the mounting seat of the spray arm assembly and meshes with the sun gear and the ring gear, and the ring gear in the planetary gear set at the output end is fixedly connected to the second spray arm.

[0010] According to some embodiments of the present invention, the spray arm assembly further includes a turntable, the turntable including an end wall and a peripheral wall disposed around the end wall, the end wall and the second spray arm being fixedly connected, the gear ring being disposed within the peripheral wall and fixedly connected to the peripheral wall, the end wall, the gear ring, the mounting base and the rotating shaft of the spray arm assembly enclosing and defining an installation space, the installation space being suitable for accommodating the sun gear and the planetary gears.

[0011] According to some embodiments of the present invention, one end of the mounting base along the first rotation axis is fixedly connected to the spray arm base, and the other end of the mounting base along the first rotation axis is provided with at least one mounting shaft, and the planetary gear is rotatably mounted on the mounting shaft; and / or, the outer periphery of the mounting base is provided with a support portion, and the gear ring is rotatably supported on the support portion.

[0012] According to some embodiments of the present invention, the first spray arm is located on the side of the second spray arm facing away from the first reducer, the rotating shaft of the spray arm assembly is located on the side of the second spray arm facing the first reducer, the first spray arm is provided with a first tube extending axially toward the second spray arm and communicating with the first flow channel, the second spray arm is provided with a first through hole, the first tube passes through the first through hole and is fixedly connected to the rotating shaft, and the sun gear in the planetary gear set at the input end is sleeved on the outside of the rotating shaft and fixedly connected to the rotating shaft.

[0013] According to some embodiments of the present invention, the sun gear in the planetary gear set at the input end is arranged coaxially with the first spray arm, the gear ring in the planetary gear set at the output end is arranged coaxially with the second spray arm, and / or, the outer circumferential surface of the sun gear is provided with an external tooth portion, the inner circumferential surface of the gear ring is provided with an internal tooth portion, the planet gear is located between the sun gear and the gear ring, and is meshed with the external tooth portion and the internal tooth portion respectively.

[0014] According to some embodiments of the present invention, the first rotation axis is parallel to and spaced apart from the second rotation axis, the reducer is a second reducer, the second reducer includes a mating gear and a transmission gear meshing sequentially, or the second reducer includes a mating gear and a plurality of transmission gears meshing sequentially, one of the transmission gears is fixedly connected to the first spray arm, the mating gear is fixedly installed on the mounting base of the spray arm assembly, and at least one of the transmission gears is coaxial with the second spray arm and rotatably disposed on the second spray arm.

[0015] According to some embodiments of the present invention, the first spray arm is located on the side of the second spray arm facing away from the second reducer. The first spray arm is provided with a first extension shaft extending axially toward the second spray arm. The second spray arm is provided with a second through hole. The first extension shaft passes through the second through hole and is fixedly connected to one of the transmission gears.

[0016] According to some embodiments of the present invention, the transmission gears are multiple and include a first transmission gear and at least one second transmission gear. The first transmission gear is mounted on the first spray arm, and the second transmission gear meshes between the first transmission gear and the mating gear. The second spray arm is provided with a second extension shaft extending axially away from the first spray arm. The second extension shaft passes through the second transmission gear and is rotatably connected to the second transmission gear.

[0017] According to some embodiments of the present invention, the first spray arm is located on the side of the second spray arm facing away from the second reducer, the rotating shaft of the spray arm assembly is connected to the second spray arm and is located on the side of the second spray arm facing the second reducer, the second spray arm is provided with a second tube extending axially away from the first spray arm, the second tube and / or the rotating shaft are rotatably passed through the mating gear, and the second tube is fixedly connected to the rotating shaft.

[0018] According to some embodiments of the present invention, the transmission gear includes a first transmission gear and a second transmission gear that mesh sequentially. The second transmission gear is a double-layer gear. The rotation axis of the second transmission gear is not coaxial with the second rotation axis and is rotatably disposed on the second spray arm. The first transmission gear is coaxial with the first spray arm and fixedly connected. The first transmission gear meshes with one layer of the double-layer gear. The mating gear is coaxial with the second spray arm and meshes with the other layer of the double-layer gear.

[0019] According to some embodiments of the present invention, the second spray arm includes a first arm portion and a second arm portion located on both sides of the second rotation axis, the size of the first arm portion is larger than the size of the second arm portion, and the first spray arm is rotatably mounted on the second arm portion.

[0020] According to some embodiments of the present invention, the spray arm assembly further includes a spray arm seat, one end of the mounting base along the second rotation axis is fixedly connected to the spray arm seat, and the outer periphery of the mounting base along the other end of the second rotation axis is provided with teeth to form the mating gear.

[0021] The dishwasher according to an embodiment of the present invention includes a spray arm assembly according to an embodiment of the present invention.

[0022] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a front view of the spray arm assembly according to the first embodiment of the present invention; Figure 2 yes Figure 1 An exploded view from one perspective; Figure 3 yes Figure 1 An exploded view from another perspective; Figure 4 yes Figure 1 A sectional view; Figure 5 yes Figure 4 The center circle shows a magnified view of a portion at point A; Figure 6 This is a schematic diagram of the structure of the rotating shaft according to an embodiment of the present utility model; Figure 7 This is a schematic diagram of the sun gear according to the first embodiment of the present invention; Figure 8 yes Figure 3 The center circle shows a magnified view of a portion at point B. Figure 9 This is a front view of the spray arm assembly according to the second embodiment of the present utility model; Figure 10 yes Figure 9 An exploded view from one perspective; Figure 11 yes Figure 9 An exploded view from another perspective; Figure 12 yes Figure 9 A sectional view; Figure 13 yes Figure 9 The center circle shows a magnified view of point C. Figure 14 yes Figure 11 The center circle shows a magnified view of point D. Figure 15 yes Figure 11 The middle circle shows a magnified view of point E.

[0024] Figure label: Spray arm assembly 100; Spray arm 10; Arm section 101; First spray arm 11; first flow channel 111; first spray hole 112; first tube body 113; third limiting recess 1131; first extension shaft 114; Second spray arm 12; second flow channel 121; second spray hole 122; first limiting protrusion 123; first through hole 1241; second through hole 1242; second tube body 125; second extension shaft 126; first arm 127; second arm 128; Transmission assembly 20; Reducer 201; First reducer 21; planetary gear set 210; sun gear 211; fourth limiting recess 2111; gear ring 212; second limiting protrusion 2121; planetary gear 213; Second reducer 22; transmission gear 221; first transmission gear 223; second transmission gear 224; mating gear 225; Spray arm holder 31; water inlet 311; mounting base 32; mounting shaft 321; support part 322; Turntable 40; End wall 41; First limiting recess 411; Peripheral wall 42; Second limiting recess 421; Rotating shaft 50; third limiting protrusion 51; fourth limiting protrusion 52; buffer 61; fastener 62; First axis of rotation F1, second axis of rotation F2. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0026] 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", "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, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0027] In the description of this utility model, "first feature" and "second feature" may include one or more of the features, "multiple" means two or more, "first feature above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them, and "first feature above", "above" and "over" the second feature may include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0028] The following description, with reference to the accompanying drawings, describes a spray arm assembly 100 according to an embodiment of the present invention, which is used in a dishwasher.

[0029] Reference Figures 1-15 As shown, the spray arm assembly 100 according to an embodiment of the present invention may include a transmission assembly 20 and a plurality of spray arms 10.

[0030] Specifically, the plurality of spray arms 10 includes a first spray arm 11 and a second spray arm 12. The first spray arm 11 has a first flow channel 111 and a first nozzle 112. The first flow channel 111 communicates with the first nozzle 112, and the first nozzle 112 can communicate with the outside world to spray water to the outside. The first spray arm 11 is driven by the first nozzle 112 and rotates about a first rotation axis F1. For example, at least one first nozzle 112 extends obliquely relative to the first rotation axis F1 to spray water through the first nozzle 112 to drive the first spray arm 11 to rotate. The second spray arm 12 has a second flow channel 121 and a second nozzle 122. The second flow channel 121 communicates with the second nozzle 122, and the second nozzle 122 can communicate with the outside world to spray water to the outside. The second spray arm 12 is rotatable about a second rotation axis F2. A transmission assembly 20 drives the first spray arm 11 and the second spray arm 12 to rotate. The first spray arm 11 drives the second spray arm 12 to rotate through the transmission assembly 20. The rotational speed of the first spray arm 11 is different from that of the second spray arm 12.

[0031] The spray arm assembly 100 can be supplied with liquids such as water and cleaning agents according to user needs. For ease of understanding, the following description uses water supply as an example. For instance, water can be supplied to the first flow channel 111 of the first spray arm 11 and the second flow channel 121 of the second spray arm 12, and the start / stop and flow rate of the water supply can be controlled. The water supplied to the first flow channel 111 can be sprayed to the outside through the first nozzle 112. The reaction force of the water flow sprayed outward from the first nozzle 112 can drive the first spray arm 11 to rotate around the first rotation axis F1. The water supplied to the second flow channel 121 can be sprayed to the outside through the second nozzle 122. The water flow sprayed to the outside through the first nozzle 112 and the second nozzle 122 can rinse tableware.

[0032] The first spray arm 11 and the second spray arm 12 may each include one or more arm portions 101, and the first flow channel 111 and the second flow channel 121 may each be one or more. For example, in some embodiments, such as Figures 1-8 As shown, the first spray arm 11 includes two arm portions 101 located on both sides of the first rotation axis F1. The first flow channel 111 is one and is provided on the two arm portions 101. At least one first spray hole 112 opens in a counterclockwise direction around the first rotation axis F1. The water flow sprayed from the first spray hole 112 is sprayed out in a counterclockwise direction around the first rotation axis F1, so that the first spray arm 11 is subjected to the reaction force of the water flow sprayed out from the multiple first spray holes 112 and rotates in a clockwise direction around the first rotation axis F1.

[0033] For example, in other embodiments, such as Figures 9-15As shown, the first spray arm 11 includes two arm portions 101 located on both sides of the first rotation axis F1. Two first flow channels 111 are arranged along a direction perpendicular to the first rotation axis F1 and located on the two arm portions 101. Each first flow channel 111 communicates with the outside through a first spray hole 112. Each of the two first flow channels 111 has at least one first spray hole 112 with opposite opening directions, so that when water flows through the two channels individually, the water spray direction and the rotation direction of the first spray arm 11 are opposite. This achieves forward and reverse rotation of the first spray arm 11, increasing the rinsing angle of the first spray arm 11 on the tableware and improving the cleaning effect.

[0034] The number and opening direction of the second nozzles 122 are not limited, as long as the water flow in the second channel 121 can be sprayed out through the second nozzles 122 to clean the tableware. The first spray arm 11 rotates due to the reaction force of the water flow sprayed from the first nozzles 112. The second spray arm 12 rotates under the drive of the first spray arm 11 via the transmission assembly 20. The rotation direction and speed of the second spray arm 12 are not limited, and the rotation direction and speed of the second spray arm 12 can be changed by the transmission assembly 20. For example, in an embodiment where the transmission assembly 20 is a reducer 201, the speed of the first spray arm 11 is greater than the speed of the second spray arm 12. For example, in an embodiment where the transmission assembly 20 is a speed increaser, the speed of the first spray arm 11 is less than the speed of the second spray arm 12.

[0035] The rotational speed of the first spray arm 11 differs from that of the second spray arm 12. The rotational speed of the first spray arm 11 can be adjusted by regulating the water pressure, the number of first spray holes 112, the opening direction of the first spray holes 112, and the arrangement of the first spray holes 112. The rotational speed of the second spray arm 12 can be adjusted by the transmission assembly 20, making the rotational speed of the first spray arm 11 greater than or less than that of the second spray arm 12. For ease of understanding, the following explanation uses the example of the first spray arm 11 having a higher rotational speed than the second spray arm 12. Correspondingly, based on the following description, an embodiment where the rotational speed of the first spray arm 11 is less than that of the second spray arm 12 can also be obtained.

[0036] In some related technologies, excessively high spray arm rotation speed results in insufficient continuous water flow impact time on the same spot of the dishes, leading to poor rinsing and cleaning effects. Spray arms typically rotate by spraying water through drive holes with openings angled relative to their rotation axis. Reducing the spray arm speed decreases the driving force, making it prone to stopping. Furthermore, the risk of a low-speed spray arm stopping is higher due to factors such as dishwasher internal temperature, detergent, contaminants, and size differences. Therefore, it is difficult to reduce the spray arm speed while ensuring continuous rotation.

[0037] In this application, the transmission assembly 20 drives the first spray arm 11 to rotate the second spray arm 12 at a lower speed. This reduces the rotational speed of the second spray arm 12, allowing the water jet from the second spray arm 12 to slowly and continuously rinse the same area of ​​the tableware, achieving a slow-fast washing effect. The water jet from the slowly rotating second spray arm 12 is more stable, providing a longer continuous impact on the same area and enhancing the targeted rinsing effect on stubborn stains. Furthermore, when the spray arm assembly 100 is too close to the tableware, the water jet will not quickly "skim" over the tableware, allowing more time to interact with the surface and facilitating water splashing and reflection, thus reaching more areas of the tableware surface.

[0038] Because the slow rotation of the second spray arm 12 is achieved through the first spray arm 11 and the transmission assembly 20, rather than through reducing the driving force of the drive hole on the spray arm as in related technologies, this application can reduce the rotational speed of the second spray arm 12 while ensuring continuous rotation, thereby reducing the risk of the second spray arm 12 stopping and making the washing effect of the second spray arm 12 more stable. For example, in an embodiment where the transmission assembly 20 is a reducer 201, connecting the first spray arm 11 and the second spray arm 12 through the reducer 201 can achieve speed reduction and torque increase, reducing the rotational speed of the second spray arm 12 and increasing the torque of the second spray arm 12, making the rotational speed of the second spray arm 12 lower and less prone to stopping, and making the slow rotation of the second spray arm 12 more stable.

[0039] The rotation speed of the first spray arm 11 is higher than that of the second spray arm 12, which allows the water jets from the first spray arm 11 to quickly and repeatedly rinse the tableware, achieving a fast washing effect. This increases the frequency of the spray arm assembly 100 rinsing the tableware and helps to improve the deceleration effect on the tableware.

[0040] According to the embodiment of the present invention, the spray arm assembly 100 can combine fast washing and slow washing by using the first spray arm 11 and the second spray arm 12 with different rotation speeds. The fast washing increases the rinsing frequency of the tableware as a whole, while the slow washing extends the continuous impact time on any part of the tableware, thus improving the cleaning effect. At the same time, by utilizing the transmission characteristics of the transmission assembly 20, the risk of the slower-rotating spray arm 10 stopping is greatly reduced, and the rotational stability of the first spray arm 11 and the second spray arm 12 is improved, thereby improving the stability of the spray arm assembly 100 in rinsing the tableware.

[0041] In addition to the first spray arm 11 and the second spray arm 12, the plurality of spray arms 10 may also include other spray arms 10. For example, in some embodiments of this utility model, the plurality of spray arms 10 includes a first spray arm 11, a second spray arm 12, and a third spray arm. The third spray arm has a third flow channel, which communicates with the outside through a third spray hole. The third spray arm is rotatable about a third rotation axis. At least one third spray hole extends obliquely relative to the third rotation axis to spray water through the third spray hole to drive the third spray arm to rotate. The first spray arm 11 and the second spray arm 12 are connected by a transmission assembly 20 so that the first spray arm 11 and the second spray arm 12 rotate at different speeds. The third spray arm is located on the side of the first spray arm 11 facing away from the second spray arm 12 and is rotatably connected to the first spray arm 11, for example, the third spray arm and the first spray arm 11 are rotatably connected by a bearing. By using the first spray arm 11, the second spray arm 12, and the third spray arm, not only can a combination of fast washing and slow washing be achieved, but the rinsing angle and rinsing frequency of the spray arm assembly 100 on the tableware can also be increased, thereby improving the washing effect.

[0042] Based on the above description, embodiments of multiple spray arms 10, including a first spray arm 11, a second spray arm 12, a third spray arm, and more spray arms 10, can also be obtained, which will not be repeated here.

[0043] In some embodiments, such as Figures 1-15 As shown, the transmission assembly 20 is a reducer 201. The input end of the reducer 201 is connected to the first spray arm 11, and the output end of the reducer 201 is connected to the second spray arm 12, so that the rotational speed of the first spray arm 11 is greater than that of the second spray arm 12. The reducer 201 has the function of reducing the rotational speed and increasing the torque. The driving force of the first spray arm 11 directly transmitted to the second spray arm 12 may not be enough to drive the second spray arm 12 to move, but the driving force of the first spray arm 11 is reduced and increased in torque after being transmitted through the reducer 201, making it easier to drive the second spray arm 12 to move, making the second spray arm 12 less likely to jam or stop, and making the rotation of the second spray arm 12 smoother.

[0044] Therefore, the reducer 201 enables the transmission connection between the first spray arm 11 and the second spray arm 12, allowing the second spray arm 12 to rotate slowly without reducing the speed of the first spray arm 11. This reduces the risk of the first spray arm 11 and the second spray arm 12 stopping, improves the stability of their rotation, enhances the stability of the combination of fast and slow washing, and improves the cleaning effect of the spray arm assembly 100 on the tableware.

[0045] The reducer 201 can be a cylindrical gear reducer, planetary gear reducer, bevel gear reducer or bevel-cylindrical gear reducer, etc., which can enable the first spray arm 11 to be connected to the second spray arm 12 through the reducer 201 to drive the second spray arm 12 to move.

[0046] In some embodiments of this utility model, such as Figures 1-5 As shown, the first rotation axis F1 and the second rotation axis F2 are coaxial, meaning the first spray arm 11 and the second spray arm 12 can rotate around the same axis. This prevents the first spray arm 11 and the second spray arm 12 from wobbling relative to each other, thus improving the overall balance of the spray arm assembly 100. The reducer 201 is a first reducer 21, which includes one or more planetary gear sets 210 meshing sequentially. Each planetary gear set 210 includes a sun gear 211, a ring gear 212, and at least one planet gear 213, for example... Figures 2-4 In the illustrated embodiment, the first reducer 21 includes a planetary gear set 210, which includes two planetary gears 213. In the first reducer 21, the sun gear 211 in the input planetary gear set 210 is fixedly connected to the first spray arm 11, allowing the driving force generated by the rotation of the first spray arm 11 to be transmitted to the sun gear 211 in the input planetary gear set 210. The planetary gears 213 are rotatably mounted on the mounting base 32 of the spray arm assembly 100 and mesh with the sun gear 211 and the ring gear 212, allowing the sun gear 211 to transmit the driving force to the ring gear 212 through the planetary gears 213. The ring gear 212 in the output planetary gear set 210 is fixedly connected to the second spray arm 12, allowing the ring gear 212 in the output planetary gear set 210 to transmit the driving force to the second spray arm 12.

[0047] It should be noted that the fixed connection in this application refers to a fixed connection where the two parts are firmly connected and not easily move relative to each other, including detachable and non-detachable connections. The fixed connection can be one or more of the following connection methods: snap-fit, bolt connection, welding, interference fit, and combination of other connection methods.

[0048] In an embodiment where the planetary gear set 210 is a single unit, such as Figures 1-5 As shown, the sun gear 211 is fixedly connected to the first spray arm 11, the gear ring 212 is fixedly connected to the second spray arm 12, and the planet gear 213 meshes with the sun gear 211 and the gear ring 212 to realize the transmission connection between the first spray arm 11 and the second spray arm 12. The reduction ratio of the first reducer 21 is the ratio of the number of teeth of the gear ring 212 to the number of teeth of the sun gear 211.

[0049] In an embodiment where there are two planetary gear sets 210, for the input planetary gear set 210, the sun gear 211 is fixedly connected to the first spray arm 11, the ring gear 212 is fixedly connected to the sun gear 211 of the output planetary gear set 210, and the planet gears 213 mesh with the sun gear 211 and the ring gear 212. For the output planetary gear set 210, the sun gear 211 is fixedly connected to the ring gear 212 of the input planetary gear set 210, the ring gear 212 is fixedly connected to the second spray arm 12, and the planet gears 213 mesh with the sun gear 211 and the ring gear 212.

[0050] In embodiments where there are three or more planetary gear sets 210, for the input planetary gear set 210, the sun gear 211 is fixedly connected to the first spray arm 11, the ring gear 212 is fixedly connected to the sun gear 211 of the adjacent planetary gear set 210, and the planet gear 213 meshes with the sun gear 211 and the ring gear 212. For the output planetary gear set 210, the sun gear 211 is fixedly connected to the ring gear 212 of the adjacent planetary gear set 210, the ring gear 212 is fixedly connected to the second spray arm 12, and the planet gear 213 meshes with the sun gear 211 and the ring gear 212. For the planetary gear set 210 between the input and output ends, the sun gear 211 is fixedly connected to the ring gear 212 near the input planetary gear set 210, the ring gear 212 is fixedly connected to the sun gear 211 near the output planetary gear set 210, and the planet gear 213 meshes with the sun gear 211 and the ring gear 212.

[0051] The first reducer 21 enables the transmission connection between the first spray arm 11 and the second spray arm 12. By adjusting the number of planetary gear sets 210 and the gear ratio between the ring gear 212 and the sun gear 211 in each planetary gear set 210, the reduction ratio of the first reducer 21 can be adjusted to regulate the rotational speed of the second spray arm 12. This ensures that the water jet from the second spray arm 12 continuously impacts the same location on the tableware for a sufficiently long time to enhance the rinsing effect on stubborn stains. At the same time, the duration of the water jet from the second spray arm 12 impacting the same location on the tableware is not too long, allowing the second spray arm 12 to impact more areas of the tableware, increasing the rinsing area of ​​the tableware and improving the cleaning effect.

[0052] In addition, the first reducer 21 has a relatively simple structure and small size, which is conducive to the miniaturization of the spray arm assembly 100, so that the spray arm assembly 100 can be installed in the dishwasher and the area inside the dishwasher for placing tableware can be increased, so that more tableware can be placed and rinsed in the dishwasher, thereby improving the dishwasher's washing efficiency.

[0053] In some embodiments, such as Figures 1-5 As shown, the spray arm assembly 100 also includes a turntable 40, which includes an end wall 41 and a peripheral wall 42 disposed around the end wall 41. The end wall 41 is fixedly connected to the second spray arm 12, and a gear ring 212 is disposed within and fixedly connected to the peripheral wall 42, so that the gear ring 212 can transmit driving force to the second spray arm 12 through the turntable 40. Installing the turntable 40 on the second spray arm 12 instead of the first reducer 21 can reduce the burden on the first reducer 21 and improve the transmission effect of the transmission assembly 20.

[0054] like Figure 5As shown, the end wall 41, gear ring 212, mounting base 32, and the rotating shaft 50 of the spray arm assembly 100 enclose and define an installation space. The installation space can accommodate the sun gear 211 and planet gears 213, so that the first reducer 21 is located radially inside the peripheral wall 42. The turntable 40 can enclose the first reducer 21, which helps to reduce the risk of detergent, contaminants, and other impurities in the dishwasher entering the first reducer 21 and interfering with the operation of the gear ring 212, sun gear 211, and planet gears 213, thereby protecting the first reducer 21 and improving its operational stability.

[0055] In some embodiments, such as Figures 1-5 As shown, one of the end wall 41 and the second spray arm 12 is provided with a first limiting recess 411 and the other is provided with a first limiting protrusion 123, and the first limiting recess 411 and the first limiting protrusion 123 cooperate. One of the peripheral wall 42 and the toothed ring 212 is provided with a second limiting recess 421 and the other is provided with a second limiting protrusion 2121, and the second limiting recess 421 and the second limiting protrusion 2121 cooperate.

[0056] The engagement of the first limiting recess 411 with the first limiting protrusion 123, and the engagement of the second limiting recess 421 with the second limiting protrusion 2121, allows for axial, circumferential, and radial positioning of the gear ring 212, the turntable 40, and the second spray arm 12. This ensures synchronous rotation of the gear ring 212, the turntable 40, and the second spray arm 12 at the output end, minimizing relative movement and improving the transmission stability of the first reducer 21. Furthermore, the structures of the first limiting recess 411, the first limiting protrusion 123, the second limiting recess 421, and the second limiting protrusion 2121 are relatively simple, easy to manufacture, and practical. Both the first limiting recess 411 and the second limiting recess 421 extend axially along the turntable 40, enabling axial connection of the gear ring 212, the turntable 40, and the second spray arm 12, simplifying installation and operation.

[0057] The limiting recess in this application can be a through hole or a blind hole. For example, in some embodiments, such as... Figures 1-5 As shown, the first limiting recess 411 at the end wall 41 is a through hole, allowing the first limiting protrusion 123 to pass through the first limiting recess 411. This improves the limiting effect on the turntable 40 and the second spray arm 12 in both the circumferential and radial directions, making the connection between the turntable 40 and the second spray arm 12 more secure and reliable, and less prone to relative movement. Furthermore, in some embodiments, such as... Figures 1-5 As shown, the second limiting recess 421 at the peripheral wall 42 is a non-penetrating blind hole, which allows the radial outer surface and circumferential surface of the second limiting protrusion 2121 to abut against the inner wall surface of the second limiting recess 421. This provides a better limiting effect on the turntable 40 and the gear ring 212 in the radial and circumferential directions, making the connection between the turntable 40 and the gear ring 212 more secure and reliable and less prone to relative movement.

[0058] In some embodiments, such as Figures 1-5 As shown, multiple second limiting protrusions 2121 are provided on the outer peripheral surface of the gear ring 212 and are arranged at intervals along the circumference of the gear ring 212. Multiple second limiting recesses 421 are also provided and correspond one-to-one with the multiple second limiting protrusions 2121. Through the multiple second limiting protrusions 2121, the limiting effect on the gear ring 212 and the turntable 40 along the circumference can be improved, making the connection between the gear ring 212 and the turntable 40 more secure and reliable, and less prone to relative movement.

[0059] In some embodiments, such as Figures 1-5 As shown, the outer peripheral surface of the gear ring 212 abuts against the inner wall surface of the peripheral wall 42, which can improve the radial positioning effect of the gear ring 212 and the turntable 40, making the connection between the gear ring 212 and the turntable 40 more secure and reliable and less prone to relative movement.

[0060] In some embodiments, such as Figures 1-5 As shown, one axial end of the gear ring 212 abuts against the inner wall surface of the end wall 41 and the other axial end abuts against the mounting base 32, which can improve the limiting effect of the gear ring 212 and the turntable 40 along the axial direction, making the connection between the gear ring 212 and the turntable 40 more firm and reliable and less prone to relative movement.

[0061] In some embodiments, such as Figures 1-5 As shown, one axial end of the end wall 41 of the turntable 40 abuts against the second spray arm 12 and the other axial end abuts against the gear ring 212, which can improve the limiting effect of the gear ring 212, the turntable 40 and the second spray arm 12 along the axial direction, making the connection between the gear ring 212, the turntable 40 and the second spray arm 12 more firm and reliable and less prone to relative movement.

[0062] In some embodiments, such as Figures 1-5 As shown, the gear ring 212 is axially close to the end face of the mounting base 32 (e.g., Figures 1-5 The lower end face of the gear ring 212 (shown) is provided with multiple spaced-apart first bosses. The gear ring 212 is rotatably in contact with the mounting base 32 through the first bosses. The mounting base 32 is used to mount the planetary gears 213. The mounting base 32 keeps the position of the planetary gears 213 unchanged and enables them to rotate. The planetary gears 213 mesh with the sun gear 211 and the gear ring 212, enabling the sun gear 211 and the gear ring 212 to rotate at different speeds, thus transmitting the driving force of the first spray arm 11 to the second spray arm 12. The gear ring 212 is rotatably located on one side of the mounting base 32. The first bosses reduce the contact area between the gear ring 212 and the mounting base 32, thereby reducing the friction between the gear ring 212 and the mounting base 32 and improving the transmission efficiency of the first reducer 21 in connecting the first spray arm 11 and the second spray arm 12.

[0063] In some embodiments, such as Figures 1-5As shown, the spray arm assembly 100 also includes a spray arm seat 31, which can be disposed in the cavity of the dishwasher to stably mount the spray arm assembly 100. One end of a mounting base 32 along the first rotation axis F1 is fixedly connected to the spray arm seat 31, and the other end of the mounting base 32 along the first rotation axis F1 is provided with at least one mounting shaft 321, on which planetary gears 213 are rotatably mounted. There can be one or more planetary gears 213, and correspondingly, one or more mounting shafts 321, so that each planetary gear 213 is mounted on a corresponding mounting shaft 321. The mounting shafts 321 of the mounting base 32 enable stable mounting of the planetary gears 213, preventing them from easily moving or wobbling, thus improving the transmission stability of the first reducer 21.

[0064] In some embodiments, such as Figures 1-5 As shown, a support portion 322 is provided on the outer periphery of the mounting base 32, and the gear ring 212 is rotatably supported on the support portion 322. The support portion 322 of the mounting base 32 can stably support the gear ring 212, making it less likely for the gear ring 212 to fall off, move, or shake, which is beneficial to improving the transmission stability of the first reducer 21.

[0065] In some embodiments of this utility model, such as Figures 1-8 As shown, the first spray arm 11 is located on the side of the second spray arm 12 that faces away from the first reducer 21 (e.g., Figures 1-5 As shown, the first spray arm 11 is located above the second spray arm 12. The rotating shaft 50 of the spray arm assembly 100 is located on the side of the second spray arm 12 facing the first reducer 21, so that the first spray arm 11 and the rotating shaft 50 are located on both sides of the second spray arm 12. The first spray arm 11 has a first tube 113 extending axially toward the second spray arm 12 and communicating with the first flow channel 111. The second spray arm 12 has a first through hole 1241. The first tube 113 passes through the first through hole 1241. The first tube 113 and the first through hole 1241 can be one or more combinations of interference fit, sealing connection and other fitting relationships.

[0066] The first tube 113 is fixedly connected to the rotating shaft 50, so that the driving force of the first spray arm 11 can be transmitted to the rotating shaft 50 to make the rotating shaft 50 and the first spray arm 11 rotate synchronously. The sun gear 211 in the planetary gear set 210 at the input end is sleeved on the outside of the rotating shaft 50 and fixedly connected to the rotating shaft 50, so that the rotating shaft 50 can transmit the driving force of the first spray arm 11 to the sun gear 211 in the planetary gear set 210 at the input end, which helps to improve the connection stability between the first spray arm 11 and the input end of the first reducer 21. The output end of the first reducer 21 is connected to the second spray arm 12, which helps to improve the transmission stability between the first spray arm 11 and the second spray arm 12.

[0067] In some embodiments, such as Figures 1-8As shown, the first tube body 113 is provided with a first connecting hole. The first connecting hole connects the first flow channel 111 and the second flow channel 121, facilitating the simultaneous supply of water to the first flow channel 111 and the second flow channel 121 through a single inlet 311, eliminating the need for separate inlets 311 to supply water to the first flow channel 111 and the second flow channel 121, thus simplifying the structure of the spray arm assembly 100. For example... Figures 1-5 In the embodiment shown, a water inlet 311 is provided at the bottom of the mounting base 32 to simultaneously supply water to the first flow channel 111 and the second flow channel 121.

[0068] In some embodiments, such as Figures 1-8 As shown, one of the first tube body 113 and the rotating shaft 50 is provided with a plurality of third limiting recesses 1131 arranged circumferentially, and the other of the first tube body 113 and the rotating shaft 50 is provided with a plurality of third limiting protrusions 51 to correspond and cooperate with the plurality of third limiting recesses 1131. Through the cooperation of the third limiting recesses 1131 and the third limiting protrusions 51, the first tube body 113 and the rotating shaft 50 can be limited in the axial, circumferential and radial directions, so that the first spray arm 11 and the rotating shaft 50 rotate synchronously and are not prone to relative movement, which is beneficial to improving the transmission stability of the first reducer 21. Moreover, the structure of the third limiting recesses 1131 and the third limiting protrusions 51 is relatively simple, easy to manufacture and has good practicality.

[0069] In some embodiments, such as Figures 1-8 As shown, one of the rotating shaft 50 and the sun gear 211 of the input planetary gear set 210 is provided with a plurality of fourth limiting recesses 2111 arranged circumferentially, and the other of the rotating shaft 50 and the sun gear 211 of the input planetary gear set 210 is provided with a plurality of fourth limiting protrusions 52 to cooperate with the plurality of fourth limiting recesses 2111 one by one. Through the cooperation of the fourth limiting recesses 2111 and the fourth limiting protrusions 52, the rotating shaft 50 and the sun gear 211 can be limited in the axial, circumferential and radial directions, so that the rotating shaft 50 and the sun gear 211 of the input planetary gear set 210 rotate synchronously and are not prone to relative movement, which is beneficial to improving the transmission stability of the first reducer 21. Moreover, the structure of the fourth limiting recesses 2111 and the fourth limiting protrusions 52 is relatively simple, easy to manufacture and practical.

[0070] For example, in some embodiments, such as Figures 1-5 As shown, one axial end of the sun gear 211 of the input planetary gear set 210 (such as...) Figures 1-5 The lower end of the sun gear 211 is provided with a fourth limiting recess 2111, and the other axial end of the sun gear 211 of the input planetary gear set 210 (such as...) Figures 1-5 The upper middle part (the middle part) abuts against the first tube body 113, which can limit the sun gear 211 along the axial direction, making the installation of the sun gear 211 more stable.

[0071] In some embodiments, such as Figures 1-5 As shown, in the planetary gear set 210 at the input end, the sun gear 211 is coaxially arranged with the first spray arm 11, allowing the sun gear 211 to rotate coaxially with the first spray arm 11. This enables the driving force of the first spray arm 11 to be transmitted to the sun gear 211 more stably, reducing energy loss during transmission. In the planetary gear set 210 at the output end, the gear ring 212 is coaxially arranged with the second spray arm 12, allowing the gear ring 212 to rotate coaxially with the second spray arm 12. This enables the gear ring 212 to transmit driving force to the second spray arm 12 more stably, reducing energy loss during transmission and improving the transmission efficiency of the first reducer 21 in connecting the first spray arm 11 and the second spray arm 12. Here, "coaxial" can refer to the fact that the axes of their geometric centers are the same, or it can refer to the axes of their rotational centers being the same.

[0072] In some embodiments, such as Figures 1-8 As shown, the outer circumferential surface of the sun gear 211 has external teeth, the inner circumferential surface of the gear ring 212 has internal teeth, and the planet gear 213 is located between the sun gear 211 and the gear ring 212 and meshes with both the external and internal teeth. This arrangement of the sun gear 211, planet gear 213, and gear ring 212 on the same plane facilitates the improvement of the structural compactness of the first reducer 21 while ensuring its transmission efficiency.

[0073] In some embodiments of this utility model, such as Figures 9-13 As shown, the first rotation axis F1 is parallel to and spaced apart from the second rotation axis F2, meaning that the first spray arm 11 and the second spray arm 12 can rotate around different axes, which makes the rinsing range of the water jets sprayed by the first spray arm 11 and the second spray arm 12 wider and the rinsing angle more, which is conducive to improving the cleaning effect on tableware.

[0074] The reducer 201 is a second reducer 22. In some embodiments, the second reducer 22 includes a mating gear 225 and a transmission gear 221 that mesh sequentially. In other embodiments, such as Figures 9-13 As shown, the second reducer 22 includes a mating gear 225 and a plurality of transmission gears 211 that mesh in sequence.

[0075] A transmission gear 221 is fixedly connected to the first spray arm 11, enabling the driving force generated by the rotation of the first spray arm 11 to be transmitted to the transmission gear 221. In an embodiment where there is one transmission gear 221, the transmission gear 221 can transmit the driving force of the first spray arm 11 to a mating gear 225 that meshes with it. In embodiments where there are multiple transmission gears 221, such as... Figures 9-13 As shown, the transmission gear 221 can transmit the driving force of the first spray arm 11 to other transmission gears 221 that mesh with it, and then the other transmission gears 221 transmit it to the meshing gear 225.

[0076] The gear 225 is fixedly mounted on the mounting base 32 of the spray arm assembly 100, for example, the mounting base 32 is mounted on a dishwasher, so that the gear 225 is fixed relative to the dishwasher. At least one transmission gear 221 is rotatably disposed on the second spray arm 12, which is coaxial with the second spray arm 12. Here, coaxial can mean that the axes of their geometric centers are different, or that the axes of their rotation centers are different.

[0077] In an embodiment where there is one transmission gear 221, the transmission gear 221 is both fixedly connected to the first spray arm 11 and rotatably connected to the second spray arm 12 on a different axis. In embodiments where there are multiple transmission gears 221, such as... Figures 9-13 As shown, one transmission gear 221 may be fixedly connected to the first spray arm 11, and another transmission gear 221 may be rotatably connected to the second spray arm 12 on a different axis. Alternatively, the same transmission gear 221 may be fixedly connected to both the first spray arm 11 and rotatably connected to the second spray arm 12 on a different axis.

[0078] A transmission gear 221 rotates synchronously with the first spray arm 11, giving it a tendency to rotate. A mating gear 225 is fixed, allowing other transmission gears 221 meshing with the mating gear 225 to rotate on their own axis and around the mating gear 225. The second spray arm 12 is rotatable relative to the mating gear 225. At least one transmission gear 221 is coaxial with and rotatably mounted on the second spray arm 12, allowing the transmission gear 221, which rotates around the mating gear 225 but is coaxial with the second spray arm 12, to drive the second spray arm 12 to rotate around the second rotation axis F2, thus transmitting driving force to the second spray arm 12. This causes the second spray arm 12 to rotate along the second rotation axis F2, while the first spray arm 11 rotates around the first rotation axis F1 and revolves around the second rotation axis F2.

[0079] In an embodiment where there is one transmission gear 221, the transmission gear 221 meshes with the mating gear 225. The transmission gear 221 is fixedly connected to the first spray arm 11, is not coaxial with the second spray arm 12, and is rotatably engaged with the second spray arm 12. The second spray arm 12 is rotatable relative to the mating gear 225, thereby realizing the transmission connection between the first spray arm 11 and the second spray arm 12. The reduction ratio of the second reducer 22 is the ratio of the number of teeth of the mating gear 225 to the number of teeth of the transmission gear 221.

[0080] In some embodiments where there are two or more transmission gears 221, such as Figures 9-15As shown, multiple transmission gears 221 are sequentially meshed with a mating gear 225. The transmission gear 221 furthest from the mating gear 225 is fixedly connected to the first spray arm 11. The second spray arm 12 is rotatable relative to the mating gear 225. At least one transmission gear 221 is rotatably disposed on the second spray arm 12 to realize the transmission connection between the first spray arm 11 and the second spray arm 12.

[0081] The second reducer 22 enables the transmission connection between the first spray arm 11 and the second spray arm 12. By adjusting the number and teeth of the transmission gears 221, the reduction ratio of the second reducer 22 can be adjusted to regulate the rotational speed of the second spray arm 12. This ensures that the water jets from the second spray arm 12 continuously impact the same location on the tableware for a sufficiently long time to enhance the rinsing effect on stubborn stains. However, the duration of the water jets from the second spray arm 12 impacting the same location on the tableware is not too long, allowing the second spray arm 12 to impact more areas of the tableware, increasing the rinsing area of ​​the tableware and improving the cleaning effect.

[0082] In addition, the second reducer 22 has a simpler structure and smaller size, which facilitates the miniaturization of the spray arm assembly 100, so that the spray arm assembly 100 can be installed in the dishwasher and the area inside the dishwasher for placing tableware can be increased, so that more tableware can be placed and rinsed in the dishwasher, thereby improving the dishwasher's washing efficiency.

[0083] In some embodiments, such as Figures 9-15 As shown, the first spray arm 11 is located on the side of the second spray arm 12 that faces away from the second reducer 22 (e.g., Figures 9-13 The first spray arm 11 is located above the second spray arm 12. The first spray arm 11 has a first protruding shaft 114 extending axially toward the second spray arm 12, and the second spray arm 12 has a second through hole 1242. The first protruding shaft 114 passes through the second through hole 1242. The first protruding shaft 114 and the second through hole 1242 can be one or more combinations of clearance fit, sealing connection, and other fit relationships, so that the first protruding shaft 114 can be rotatably passed through the second through hole 1242.

[0084] The first extending shaft 114 is fixedly connected to a transmission gear 221, so that the driving force of the first spray arm 11 can be transmitted to the transmission gear 221 through the first extending shaft 114. The transmission gear 221 can transmit the driving force to the meshing gear 225 and then to the second spray arm 12, which helps to improve the connection stability between the first spray arm 11 and the input end of the second reducer 22. The output end of the second reducer 22 is connected to the second spray arm 12, which helps to improve the transmission stability between the first spray arm 11 and the second spray arm 12.

[0085] In some embodiments, such as Figures 9-15As shown, the first extending shaft 114 has a second connecting hole on its periphery that communicates with the first flow channel 111, and the second through hole 1242 has an opening on its periphery that communicates with the second flow channel 121. The second connecting hole and the opening communicate with each other to connect the first flow channel 111 and the second flow channel 121. Water can be supplied to the spray arm assembly 100 through a single inlet 311 to simultaneously supply water to the first flow channel 111 and the second flow channel 121, eliminating the need to supply water to the first flow channel 111 and the second flow channel 121 separately through two inlets 311, thus simplifying the structure of the spray arm assembly 100. For example... Figures 9-13 In the embodiment shown, a water inlet 311 is provided at the bottom of the mounting base 32 to simultaneously supply water to the first flow channel 111 and the second flow channel 121.

[0086] In some embodiments, such as Figures 9-15 As shown, the first extending shaft 114 has a limiting portion extending axially, and the transmission gear 221 has a limiting mating portion extending axially. The limiting portion and the limiting mating portion cooperate to limit the first extending shaft 114 and the transmission gear 221 in the circumferential and radial directions, so that the first extending shaft 114 and the transmission gear 221 rotate synchronously and are less prone to relative movement. This, in turn, allows the first spray arm 11 to rotate synchronously with the transmission gear 221, which helps to improve the transmission stability of the second reducer 22. The limiting portion can be a plane (e.g., Figures 14-15 As shown), convex, concave or other structures, the limiting fitting part is a plane that mates with the limiting part (such as... Figures 14-15 As shown), the structure includes recesses, protrusions, etc., which makes the structure of the limiting part and the limiting mating part relatively simple, easy to manufacture, and practical.

[0087] In some embodiments, such as Figures 9-15 As shown, there are multiple transmission gears 221, including a first transmission gear 223 and at least one second transmission gear 224. The first transmission gear 223 is mounted on the first spray arm 11, and the second transmission gear 224 meshes between the first transmission gear 223 and the mating gear 225. The second spray arm 12 is provided with a second extension shaft 126 extending axially away from the first spray arm. The second extension shaft 126 passes through the second transmission gear 222 and is rotatably connected to the second transmission gear 222.

[0088] There can be one or more second transmission gears 224, and correspondingly, there can be one or more second extension shafts 126, so that the second transmission gears 224 are installed on the second extension shafts 126 in a one-to-one correspondence. The second extension shafts 126 can limit the second transmission gears 224, making it less likely for the second transmission gears 224 to shift laterally in the radial direction, reducing the possibility of relative wobbling between the second reducer 22 and the second spray arm 12, and improving the transmission efficiency of the second reducer 22 in driving the connection between the first spray arm 11 and the second spray arm 12.

[0089] In some embodiments, such as Figures 9-15 As shown, the first spray arm 11 is located on the side of the second spray arm 12 facing away from the second reducer 22. The rotating shaft 50 of the spray arm assembly 100 is connected to the second spray arm 12 and is located on the side of the second spray arm 12 facing the second reducer 22, so that the first spray arm 11 and the rotating shaft 50 are located on both sides of the second spray arm 12. The second spray arm 12 is provided with a second tube 125 extending axially away from the first spray arm 11. At least one of the second tube 125 and the rotating shaft 50 is rotatably passed through a mating gear 225, and the second tube 125 is fixedly connected to the rotating shaft 50.

[0090] By fixing the second tube 125 and the rotating shaft 50 together, the overall stability of the second spray arm 12 and the rotating shaft 50 relative to the mating gear 225 can be improved, so that the second spray arm 12 can rotate stably relative to the second reducer 22 without shaking, which is beneficial to improving the transmission stability between the first spray arm 11 and the second spray arm 12.

[0091] In some embodiments, such as Figures 9-13 As shown, the gear 225 and the mounting base 32 are integrally formed. The inner circumferential surface of the mounting base 32 is provided with multiple spaced second protrusions. The mounting base 32 is rotatably in contact with the second tube body 125 through the second protrusions, and the mounting base 32 is rotatably engaged with the rotating shaft 50 through the second protrusions. The second protrusions can reduce the contact area between the mounting base 32 and the second tube body 125, and reduce the contact area between the mounting base 32 and the rotating shaft 50, thereby reducing the friction between the second tube body 125 and the rotating shaft 50 and the mounting base 32, which is beneficial to improving the transmission efficiency of the second reducer 22 in connecting the first spray arm 11 and the second spray arm 12.

[0092] In some embodiments, such as Figures 9-13 As shown, a third boss is provided on the side of the second spray arm 12 near the second transmission gear 224, through which the second transmission gear 224 rotatably contacts the second spray arm 12. The third boss reduces the contact area between the second transmission gear 224 and the second spray arm 12, thereby reducing the friction between the second reducer 22 and the second spray arm 12, which helps to improve the transmission efficiency of the second reducer 22 in connecting the first spray arm 11 and the second spray arm 12.

[0093] In some embodiments, such as Figures 9-13 As shown, a fourth boss is provided on the side of the second spray arm 12 near the first transmission gear 223. The first transmission gear 223 is rotatably connected to the second spray arm 12 through the fourth boss. The fourth boss reduces the contact area between the first transmission gear 223 and the second spray arm 12, thereby reducing the friction between the second reducer 22 and the second spray arm 12, which helps to improve the transmission efficiency of the second reducer 22 in connecting the first spray arm 11 and the second spray arm 12.

[0094] In some embodiments, such as Figures 9-14 As shown, the spray arm assembly 100 also includes a fastener 62, which is located on the side of the transmission gear 221 facing away from the second spray arm 12. This ensures that the transmission gear 221 is stably installed between the second spray arm 12 and the fastener 62, preventing it from easily coming off axially and improving the installation stability of the second reducer 22. The fastener 62 can be a snap ring, bolt, or other fastener 62. For example, fasteners 62 are provided at both the first transmission gear 223 and the second transmission gear 224.

[0095] In some embodiments, such as Figures 9-13 As shown, the spray arm assembly 100 also includes a buffer 61, which is disposed between the first spray arm 11 and the second spray arm 12 and located at the second through hole 1242, thereby improving the connection strength and sealing of the first spray arm 11 and the second spray arm 12. The buffer 61 can be a gasket, rubber ring, etc.

[0096] In some embodiments of this utility model, such as Figures 9-13 As shown, the transmission gear 221 includes a first transmission gear 223 and a second transmission gear 224 that mesh sequentially. The second transmission gear 224 is a double-layer gear. The rotation axis of the second transmission gear 224 is not coaxial with the second rotation axis F2, and the second transmission gear 224 is rotatably mounted on the second spray arm 12. The first transmission gear 223 is coaxial with and fixedly connected to the first spray arm 11. The first transmission gear 223 meshes with one layer of the double-layer gear. The mating gear 225 is coaxial with the second spray arm 12 and meshes with the other layer of the double-layer gear.

[0097] The reduction ratio of the second reducer 22 is the product of the following two gear ratios: the gear ratio of one layer of gears in the second transmission gear 224 to the first transmission gear 223, and the gear ratio of the other layer of gears in the second transmission gear 224 to the mating gear 225. The first transmission gear 223, the second transmission gear 224, and the mating gear 225 enable the transmission connection between the first spray arm 11 and the second spray arm 12. Adjusting the number of teeth on the first transmission gear 223, the second transmission gear 224, and the mating gear 225 allows for the adjustment of the rotational speed of the second spray arm 12, thereby increasing the speed adjustment range of the second spray arm 12 and enabling slow washing at multiple speeds. Furthermore, the relatively small number of transmission gears 221 makes the spray arm assembly 100 more compact.

[0098] In some embodiments, such as Figures 9-13As shown, the second spray arm 12 includes a first arm portion 127 and a second arm portion 128 located on both sides of the second rotation axis F2. The size of the first arm portion 127 is larger than the size of the second arm portion 128. The first spray arm 11 is rotatably mounted on the second arm portion 128. Mounting the first spray arm 11 on the second arm portion 128 reduces the weight difference between the portions of the spray arm assembly 100 located on both sides of the second rotation axis F2, thereby reducing the possibility of relative swaying between the first spray arm 11 and the second spray arm 12 and improving the overall balance of the spray arm assembly 100.

[0099] In some embodiments, such as Figures 9-13 As shown, in the axial direction, the first spray arm 11 covers a portion of the second spray arm 12, and the second spray hole 122 is located on the portion of the second spray arm 12 that extends beyond the first spray arm 11, so that the first spray arm 11 is located on one side of the second spray hole 122. During the rotation of the first spray arm 11 and the second spray arm 12, the first spray arm 11 is less likely to block the second spray hole 122 from spraying water outward, so that the water flow sprayed from the first spray arm 11 and the second spray arm 12 is used more to rinse the tableware, which helps to improve the cleaning effect of the tableware.

[0100] In some embodiments, such as Figures 9-13 As shown, the total number of the first nozzle 112 and the second nozzle 122 does not exceed 10. Too many nozzles in the spray arm assembly 100 would result in excessively high water pressure requirements for supplying water to the spray arm assembly 100. By ensuring that the total number of the first nozzle 112 and the second nozzle 122 does not exceed 10, the water pressure requirements for supplying water to the spray arm assembly 100 are reduced, which helps protect external water supply components, reduces leakage problems caused by excessive water pressure, and is more economical.

[0101] In some embodiments of this utility model, such as Figures 1-5 and Figures 9-13 As shown, the spray arm assembly 100 also includes a spray arm seat 31. One end of a mounting base 32 along the second rotation axis F2 is fixedly connected to the spray arm seat 31, and the outer periphery of the other end of the mounting base 32 along the second rotation axis F2 is provided with teeth to form a mating gear 225. The spray arm seat 31 can be disposed in a dishwasher, so that after the spray arm assembly 100 is installed inside the dishwasher, the mounting base 32 remains fixed relative to the dishwasher. The spray arm seat 31 and the mounting base 32 can be a non-detachable connection such as welding, or a detachable connection such as bolt connection, snap-fit, or a combination of one or more of other connection methods.

[0102] By forming a mating gear 225 on the outer periphery of the mounting base 32, the mating gear 225 can be fixed relative to the spray arm base 31 and is less prone to shaking, thereby improving the stability of the mating gear 225 and thus improving the rotational stability of the second spray arm 12 relative to the mating gear 225. Furthermore, there is no need to add a new gear component as the mating gear 225, which reduces the number of components in the spray arm assembly 100 and improves the structural compactness of the spray arm assembly 100.

[0103] In some embodiments, such as Figures 1-5 and Figures 9-13 As shown, the spray arm seat 31 and the mounting base 32 are detachably connected. In the extension direction of the first rotation axis F1, a portion of the rotating shaft 50 is located between the spray arm seat 31 and the mounting base 32. The spray arm seat 31 and the mounting base 32 can axially limit the rotating shaft 50, making it less likely to come out. For example, during water flow, the rotating shaft 50 is less likely to come out under the impact of water flow, which helps improve the overall structural strength of the spray arm assembly 100. Furthermore, the spray arm seat 31 and the mounting base 32 are detachable, facilitating the assembly and disassembly of the spray arm seat 31, the rotating shaft 50, and the mounting base 32.

[0104] The dishwasher according to an embodiment of the present invention includes a spray arm assembly 100 according to an embodiment of the present invention. Since the spray arm assembly 100 according to an embodiment of the present invention has the aforementioned beneficial technical effects, the dishwasher according to an embodiment of the present invention, through the first spray arm 11 and the second spray arm 12 with different rotational speeds, can achieve a combination of fast and slow washing. Fast washing increases the overall rinsing frequency of the tableware, while slow washing extends the continuous impact time on any part of the tableware, improving the cleaning effect. Simultaneously, utilizing the transmission characteristics of the transmission assembly 20 greatly reduces the risk of the slower-rotating spray arm 10 stopping, improving the rotational stability of the first spray arm 11 and the second spray arm 12, thereby improving the stability of the spray arm assembly 100 in rinsing the tableware.

[0105] In some embodiments, such as Figures 1-5 and Figures 9-13 As shown, in the direction perpendicular to the extension direction of the second rotation axis F2, the maximum dimension of the spray arm assembly 100 located on either side of the second rotation axis F2 is L1, and the cavity dimension of the dishwasher is L2. Wherein, L1≤L2 / 2, so that the spray arm assembly 100 can be installed in the cavity of the dishwasher, and the first spray arm 11 and the second spray arm 12 are less likely to interfere with the position of the inner wall of the cavity during rotation, thus improving safety.

[0106] The spray arm assembly 100 and the dishwasher according to the first specific embodiment of the present invention are described in detail below with reference to the accompanying drawings. It is to be understood that the following description is merely illustrative and should not be construed as limiting the present invention.

[0107] like Figures 1-8As shown, a spray arm assembly 100 according to a specific embodiment of the present invention is used in a dishwasher. The spray arm assembly 100 includes a first spray arm 11, a second spray arm 12, and a transmission assembly 20. The first spray arm 11 has a first flow channel 111 and a first spray hole 112. The first flow channel 111 communicates with the first spray hole 112. The first spray arm 11 is driven by the first spray hole 112 and rotates about a first rotation axis F1. The first spray hole 112 extends obliquely relative to the first rotation axis F1 to spray water through the first spray hole 112 to drive the first spray arm 11 to rotate. Specifically, in Figure 2 In the state shown, the first rotation axis F1 extends in the vertical direction, the two first nozzles 112 at the left end open forward, the two first nozzles 112 at the right end open backward, and the other first nozzles 112 open upward. The two first nozzles 112 at the left end and the two first nozzles 112 at the right end spray water outward to drive the first spray arm 11 to rotate clockwise around the first rotation axis F1.

[0108] The second spray arm 12 has a second flow channel 121 and a second spray hole 122. The second flow channel 121 is connected to the second spray hole 122. The second spray arm 12 is rotatable around the second rotation axis F2.

[0109] The transmission assembly 20 is connected to the first spray arm 11 and the second spray arm 12. The first spray arm 11 drives the second spray arm 12 to rotate through the transmission assembly 20. The second rotation axis F2 extends in the vertical direction, and the second spray hole 122 opens upward.

[0110] The transmission assembly 20 is a transmission connection between the first spray arm 11 and the second spray arm 12. The first spray arm 11 drives the second spray arm 12 to rotate through the transmission assembly 20. The transmission assembly 20 is a reducer 201. The input end of the reducer 201 is connected to the first spray arm 11, and the output end of the reducer 201 is connected to the second spray arm 12, so that the rotational speed of the first spray arm 11 is greater than the rotational speed of the second spray arm 12.

[0111] The spray arm assembly 100 also includes a detachably connected spray arm seat 31 and a mounting base 32. The spray arm seat 31 is located in the dishwasher, and a portion of the rotating shaft 50 is located between the spray arm seat 31 and the mounting base 32 in the extension direction of the first rotation axis F1.

[0112] The first rotation axis F1 and the second rotation axis F2 are coaxial. The reducer 201 is a first reducer 21, which includes a planetary gear set 210. The planetary gear set 210 includes a sun gear 211, a ring gear 212, and two planet gears 213. The sun gear 211 is fixedly connected to the first spray arm 11, and the planet gears 213 are rotatably mounted on the mounting base 32 of the spray arm assembly 100 and mesh with the sun gear 211 and the ring gear 212. The ring gear 212 is fixedly connected to the second spray arm 12. The sun gear 211 is the input end of the first reducer 21, and the ring gear 212 is the output end of the first reducer 21.

[0113] The spray arm assembly 100 also includes a turntable 40, which includes an end wall 41 and a peripheral wall 42 disposed around the end wall 41. The end wall 41 is fixedly connected to the second spray arm 12, and a gear ring 212 is disposed within the peripheral wall 42 and fixedly connected to the peripheral wall 42. The end wall 41, the gear ring 212, the mounting base 32, and the rotating shaft 50 of the spray arm assembly 100 enclose and define an installation space that can accommodate the sun gear 211 and the planetary gear 213.

[0114] The lower end of the mounting base 32 is fixedly connected to the spray arm base 31. The upper end of the mounting base 32 is provided with two mounting shafts 321, and the planetary gear 213 is rotatably mounted on the mounting shafts 321. The outer periphery of the mounting base 32 is provided with a support part 322, and the gear ring 212 is rotatably supported on the support part 322.

[0115] The first spray arm 11 is located above the second spray arm 12, and the first reducer 21 is located below the second spray arm 12. The rotating shaft 50 of the spray arm assembly 100 is located below the second spray arm 12. The first spray arm 11 has a first tube 113 extending axially toward the second spray arm 12 and communicating with the first flow channel 111. The second spray arm 12 has a first through hole 1241. The first tube 113 passes through the first through hole 1241 and is fixedly connected to the rotating shaft 50. The sun gear 211 is sleeved on the outside of the rotating shaft 50 and fixedly connected to the rotating shaft 50.

[0116] The sun gear 211 is coaxially arranged with the first spray arm 11, and the gear ring 212 is coaxially arranged with the second spray arm 12. The outer circumferential surface of the sun gear is provided with external teeth, the inner circumferential surface of the gear ring 212 is provided with internal teeth, and the planet gear 213 is located between the sun gear 211 and the gear ring, and is meshed with the external teeth and the internal teeth respectively.

[0117] The spray arm holder 31 is fixed to the cavity of the dishwasher. The mounting base 32 is connected to the spray arm holder 31 by a snap-fit ​​to fix it relative to the spray arm holder 31. The first spray arm 11 rotates around the first rotation axis F1 under the action of the first spray hole 112, driving the rotating shaft 50 and the sun gear 211 to rotate. Because the sun gear 211 meshes with the planetary gear 213, the planetary gear 213 rotates on its own axis. Because the planetary gear 213 meshes with the gear ring 212, the gear ring 212 rotates around the first rotation axis F1, driving the turntable 40 to rotate, thereby driving the second spray arm 12 to rotate. The reduction ratio of the first reducer 21 is the ratio of the number of teeth of the gear ring 212 to the number of teeth of the sun gear 211.

[0118] The rotation of the first spray arm 11 serves as the power input, which, through the first reducer 21, drives the second spray arm 12 to rotate slowly, combining fast and slow washing to improve the cleaning effect on tableware. At the same time, the reduction and torque increase characteristics of the first reducer 21 reduce the risk of the slow spray arm 10 stopping, improving the stability of the spray arm assembly 100 in rinsing tableware.

[0119] The spray arm assembly 100 and the dishwasher according to the second specific embodiment of the present invention are described in detail below with reference to the accompanying drawings. It is to be understood that the following description is merely illustrative and should not be construed as limiting the present invention.

[0120] like Figures 9-15 As shown, a spray arm assembly 100 according to a specific embodiment of the present invention is used in a dishwasher. The spray arm assembly 100 includes a first spray arm 11, a second spray arm 12, and a transmission assembly 20. The first spray arm 11 has a first flow channel 111 and a first spray hole 112. The first flow channel 111 communicates with the first spray hole 112. The first spray arm 11 is driven by the first spray hole 112 and rotates about a first rotation axis F1. The first spray hole 112 extends obliquely relative to the first rotation axis F1 to spray water through the first spray hole 112 to drive the first spray arm 11 to rotate. Specifically, in Figure 2 In the state shown, the first rotation axis F1 extends in the vertical direction, the two first nozzles 112 at the left end open forward, the two first nozzles 112 at the right end open backward, and the other first nozzles 112 open upward. The two first nozzles 112 at the left end and the two first nozzles 112 at the right end spray water outward to drive the first spray arm 11 to rotate clockwise around the first rotation axis F1.

[0121] The second spray arm 12 has a second flow channel 121 and a second spray hole 122. The second flow channel 121 is connected to the second spray hole 122. The second spray arm 12 is rotatable around the second rotation axis F2.

[0122] The transmission assembly 20 is connected to the first spray arm 11 and the second spray arm 12. The first spray arm 11 drives the second spray arm 12 to rotate through the transmission assembly 20. The second rotation axis F2 extends in the vertical direction, and the second spray hole 122 opens upward.

[0123] The transmission assembly 20 is a transmission connection between the first spray arm 11 and the second spray arm 12. The first spray arm 11 drives the second spray arm 12 to rotate through the transmission assembly 20. The transmission assembly 20 is a reducer 201. The input end of the reducer 201 is connected to the first spray arm 11, and the output end of the reducer 201 is connected to the second spray arm 12, so that the rotational speed of the first spray arm 11 is greater than the rotational speed of the second spray arm 12.

[0124] The spray arm assembly 100 also includes a detachably connected spray arm seat 31 and a mounting base 32. The spray arm seat 31 is disposed on the dishwasher, and a portion of the rotating shaft 50 of the spray arm assembly 100 is located between the spray arm seat 31 and the mounting base 32 in the extension direction of the first rotation axis F1. The lower end of the mounting base 32 is fixedly connected to the spray arm seat 31, and the outer periphery of the upper end of the mounting base 32 is provided with teeth to form a mating gear 225.

[0125] The first rotation axis F1 is parallel to and spaced apart from the second rotation axis F2. The reducer 201 is the second reducer 22, which includes a mating gear 225, a first transmission gear 223, and a second transmission gear 224 that mesh sequentially. The first transmission gear 223 is fixedly connected to the first spray arm 11, the mating gear 225 is fixedly mounted on the mounting base 32 of the spray arm assembly 100, and the rotation axis of the second transmission gear 224 is not coaxial with the second rotation axis F2 and is rotatably disposed on the second spray arm 12.

[0126] The first spray arm 11 is located above the second spray arm 12, and the second reducer 22 and the rotating shaft 50 are located below the second spray arm 12. The first spray arm 11 has a first extending shaft 114 extending axially toward the second spray arm 12. The second spray arm 12 has a second through hole 124. The first extending shaft 114 passes through the second through hole 124 and is fixedly connected to the first transmission gear 223, so that the first transmission gear 223 can be rotatably mounted on the second spray arm 12. The second spray arm 12 has a second extending shaft 126 extending axially away from the first spray arm 11. The second extending shaft 126 passes through the second transmission gear 222 and is rotatably connected to the second transmission gear 222. The second spray arm 12 has a second tube 125 extending axially away from the first spray arm 11. The rotating shaft 50 is rotatably mounted on the mating gear 225, and the second tube 125 is fixedly connected to the rotating shaft 50.

[0127] The second transmission gear 224 is a double-layer gear. The first transmission gear 223 meshes with one layer of the double-layer gear. The mating gear 225 is coaxial with the second spray arm 12 and meshes with the other layer of the double-layer gear.

[0128] The second spray arm 12 includes a first arm portion 127 and a second arm portion 128 located on both sides of the second rotation axis F2. The size of the first arm portion 127 is larger than the size of the second arm portion 128. The first spray arm 11 is rotatably mounted on the second arm portion 128. Axially, the first spray arm 11 covers a portion of the second spray arm 12. Second spray holes 122 are provided on the portion of the second spray arm 12 that extends beyond the first spray arm 11. The total number of first spray holes 112 and second spray holes 122 is 10.

[0129] The first spray arm 11 rotates around the first rotation axis F1 under the action of the first spray hole 112. During the rotation of the first spray arm 11, it drives the first transmission gear 223 to rotate through the first extension shaft 114. The first transmission gear 223 meshes with the upper large gear of the double-layer gear, driving the double-layer gear, which is the second transmission gear 224, to rotate. The lower small gear of the double-layer gear meshes with the mating gear 225, which is fixed, so that the second spray arm 12 rotates at a reduced speed.

[0130] The rotation of the first spray arm 11 serves as the power input, which, through the transmission of the second reducer 22, drives the second spray arm 12 to rotate slowly, achieving a combination of fast and slow washing and improving the cleaning effect on tableware. At the same time, the reduction and torque increase characteristics of the second reducer 22 reduce the risk of the slow spray arm 10 stopping, improving the stability of the spray arm assembly 100 in rinsing tableware.

[0131] The spray arm assembly 100 and other components and operation of the dishwasher according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0132] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0133] In the description of this specification, the references to terms such as "embodiment," "specific embodiment," and "example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0134] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A spray arm assembly, characterized in that, include: Multiple spray arms, including a first spray arm and a second spray arm, the first spray arm having a first flow channel and a first spray hole, the first flow channel communicating with the first spray hole, the first spray arm being driven by the first spray hole and rotating about a first rotation axis, the second spray arm having a second flow channel and a second spray hole, the second flow channel communicating with the second spray hole, the second spray arm being rotatable about a second rotation axis; A transmission assembly is provided, which drives the first spray arm and the second spray arm to rotate. The first spray arm drives the second spray arm to rotate through the transmission assembly. The rotational speed of the first spray arm is different from that of the second spray arm.

2. The spray arm assembly according to claim 1, characterized in that, The transmission component is a speed reducer. The input end of the speed reducer is connected to the first spray arm, and the output end of the speed reducer is connected to the second spray arm, so that the rotational speed of the first spray arm is greater than that of the second spray arm.

3. The spray arm assembly according to claim 2, characterized in that, The first rotation axis is coaxial with the second rotation axis. The reducer is a first reducer, which includes one or more planetary gear sets meshing sequentially. The planetary gear set includes a sun gear, a ring gear, and at least one planet gear. The sun gear in the planetary gear set at the input end is fixedly connected to the first spray arm. The planet gear is rotatably disposed on the mounting base of the spray arm assembly and meshes with the sun gear and the ring gear. The ring gear in the planetary gear set at the output end is fixedly connected to the second spray arm.

4. The spray arm assembly according to claim 3, characterized in that, It also includes a turntable, which includes an end wall and a peripheral wall disposed around the end wall. The end wall is fixedly connected to the second spray arm. The gear ring is disposed inside the peripheral wall and fixedly connected to the peripheral wall. The end wall, the gear ring, the mounting base and the rotating shaft of the spray arm assembly enclose and define an installation space. The installation space is suitable for accommodating the sun gear and the planetary gears.

5. The spray arm assembly according to claim 3, characterized in that, The spray arm assembly further includes a spray arm base, one end of which is fixedly connected to the spray arm base along the first rotation axis, and the other end of which is provided with at least one mounting shaft, the planetary gear being rotatably mounted on the mounting shaft; and / or, The mounting base has a support portion on its outer periphery, and the gear ring is rotatably supported on the support portion.

6. The spray arm assembly according to claim 3, characterized in that, The first spray arm is located on the side of the second spray arm facing away from the first reducer. The rotating shaft of the spray arm assembly is located on the side of the second spray arm facing the first reducer. The first spray arm has a first tube extending axially toward the second spray arm and communicating with the first flow channel. The second spray arm has a first through hole. The first tube passes through the first through hole and is fixedly connected to the rotating shaft. The sun gear in the planetary gear set at the input end is sleeved on the outside of the rotating shaft and fixedly connected to the rotating shaft.

7. The spray arm assembly according to any one of claims 3-6, characterized in that, In the planetary gear set at the input end, the sun gear is arranged coaxially with the first spray arm, and in the planetary gear set at the output end, the ring gear is arranged coaxially with the second spray arm. And / or, the outer circumferential surface of the sun gear is provided with an external toothed portion, the inner circumferential surface of the gear ring is provided with an internal toothed portion, and the planet gear is located between the sun gear and the gear ring, and is meshed with the external toothed portion and the internal toothed portion respectively.

8. The spray arm assembly according to claim 2, characterized in that, The first rotation axis is parallel to and spaced apart from the second rotation axis. The reducer is a second reducer, which includes sequentially meshing mating gears and a transmission gear; alternatively, the second reducer includes sequentially meshing mating gears and multiple transmission gears. One of the transmission gears is fixedly connected to the first spray arm, the mating gear is fixedly installed on the mounting base of the spray arm assembly, and at least one of the transmission gears is coaxial with the second spray arm and rotatably disposed on the second spray arm.

9. The spray arm assembly according to claim 8, characterized in that, The first spray arm is located on the side of the second spray arm facing away from the second reducer. The first spray arm has a first protruding shaft extending axially toward the second spray arm. The second spray arm has a second through hole. The first protruding shaft passes through the second through hole and is fixedly connected to one of the transmission gears.

10. The spray arm assembly according to claim 9, characterized in that, The transmission gears are multiple, including a first transmission gear and at least one second transmission gear. The first transmission gear is mounted on the first spray arm, and the second transmission gear meshes between the first transmission gear and the mating gear. The second spray arm is provided with a second extension shaft extending axially away from the first spray arm. The second extension shaft passes through the second transmission gear and is rotatably connected to the second transmission gear.

11. The spray arm assembly according to claim 8, characterized in that, The first spray arm is located on the side of the second spray arm facing away from the second reducer, and the rotation shaft of the spray arm assembly is connected to the second spray arm and located on the side of the second spray arm facing the second reducer. The second spray arm is provided with a second tube extending axially away from the first spray arm, the second tube and / or the rotating shaft being rotatably passed through the mating gear, and the second tube being fixedly connected to the rotating shaft.

12. The spray arm assembly according to claim 8, characterized in that, The transmission gear includes a first transmission gear and a second transmission gear that mesh sequentially. The second transmission gear is a double-layer gear. The rotation axis of the second transmission gear is not coaxial with the second rotation axis and is rotatably disposed on the second spray arm. The first transmission gear is coaxial with the first spray arm and fixedly connected. The first transmission gear meshes with one layer of the double-layer gear. The mating gear is coaxial with the second spray arm and meshes with the other layer of the double-layer gear.

13. The spray arm assembly according to claim 8, characterized in that, The second spray arm includes a first arm portion and a second arm portion located on both sides of the second rotation axis. The size of the first arm portion is larger than the size of the second arm portion, and the first spray arm is rotatably mounted on the second arm portion.

14. The spray arm assembly according to any one of claims 8-13, characterized in that, The spray arm assembly also includes a spray arm seat, one end of which is fixedly connected to the spray arm seat along the second rotation axis, and the other end of which is provided with teeth to form the mating gear.

15. A dishwasher, characterized in that, Includes the spray arm assembly according to any one of claims 1-14.

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