Spray arm assembly and dishwasher

Abstract

The utility model relates to dish-washing machine technical field discloses spray arm assembly and dish-washing machine, spray arm assembly includes main spray arm, vice spray arm, main spray arm is a character shape spray arm, is provided with first nozzle on main spray arm, vice spray arm and first nozzle distribute in both sides of first rotation axis, vice spray arm has four branch spray arms that present cross shape distribution, all are provided with second nozzle on four branch spray arms, and the second nozzle on at least opposite two branch spray arms in four branch spray arms is asymmetrically set up. Cross planetary spray arm is used to the application vice spray arm, can provide more three -dimensional water flow, improve jet flow coverage, and the second nozzle on at least opposite two branch spray arms in four branch spray arms of vice spray arm is asymmetrically set up, and the more diverse sweep path, and the water flow is more dense and three -dimensional, carries out secondary removal to some unwashed area of tableware surface and the residue left over by main spray arm cleaning, further improves the cleaning effect of tableware.

Description

Technical Field

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

[0002] The dishwasher spray arms are a crucial component for effective cleaning. Currently, the main spray arm structures on the market include conventional straight spray arms and irregularly shaped spray arms, such as X-shaped, three-pronged, or planetary spray arms. This design aims to increase both the spray angle and the spray frequency, thus improving the cleaning effect. Existing planetary spray arms typically consist of a main spray arm and auxiliary spray arms, with rotation achieved through their respective drive nozzles. However, the nozzles on most existing auxiliary spray arms are symmetrically arranged, resulting in a single, dispersed water flow path, which can create cleaning dead zones and lead to poor cleaning performance. Utility Model Content

[0003] In view of this, the present invention provides a spray arm assembly and a dishwasher to solve the problems of the single and dispersed water flow sweeping path of the dishwasher spray arm in the prior art, which easily creates cleaning dead zones and results in poor cleaning effect.

[0004] In a first aspect, this utility model provides a spray arm assembly, comprising: The main spray arm is adapted to rotate about the first rotation axis; The auxiliary spray arm is adapted to be rotatably mounted on the main spray arm about a second rotation axis, wherein the first rotation axis and the second rotation axis are not coaxial; The main spray arm is a straight spray arm with a first nozzle on it. The auxiliary spray arm and the first nozzle are distributed on both sides of the first rotation axis. The auxiliary spray arm has four branch spray arms arranged in a cross shape. Each of the four branch spray arms is provided with a second nozzle, and the second nozzles on at least two opposite branch spray arms are asymmetrically arranged.

[0005] Beneficial effects: The secondary spray arm adopts a cross-shaped planetary spray arm design. Compared with the straight secondary spray arm, the cross-shaped secondary spray arm can provide a more three-dimensional water flow, improve the jet coverage, and achieve better cleaning effect. In addition, the second nozzles on at least two of the four branch spray arms of the secondary spray arm are asymmetrically arranged, resulting in more diverse sweeping paths and a denser and more three-dimensional water flow. This allows for secondary removal of some unwashed areas on the surface of the tableware and residues left by the main spray arm, further improving the cleaning effect of the tableware. In one optional embodiment, the main spray arm includes a spray arm body, which includes a main body section and a lowering section. The lower section is below the main section, and the auxiliary spray arm is installed on the lower section.

[0006] Beneficial effects: By employing main sections and lower sections at different heights in the main spray arm, and installing the auxiliary spray arm on the lower section, the mass of the entire spray arm assembly is balanced. This ensures that the center of gravity of the entire spray arm assembly falls on the first axis of rotation, guaranteeing the balance and stability of the spray arm assembly during rotation. It effectively avoids the problem of the center of gravity shifting towards the auxiliary spray arm due to its installation, which could lead to imbalance and prevent the entire spray arm assembly from rotating properly. Furthermore, this design also allows the second nozzles on the main and auxiliary spray arms to be located at the same height, facilitating installation layout.

[0007] In one alternative embodiment, a first nozzle is provided on the main body segment; The top surface of the end of the sinking section away from the main section is provided with an assembly hole, and the auxiliary spray arm is rotatably connected in the assembly hole and communicates with the inner cavity of the main spray arm.

[0008] Beneficial effects: The main body is equipped with a first nozzle, and the auxiliary spray arm is installed on the sinking section, so that the entire spray arm assembly is equipped with nozzles along its length, resulting in a denser water jet and reduced spray dead angles. Furthermore, the auxiliary spray arm is rotatably connected in the assembly hole, facilitating the rotation of the auxiliary spray arm via the second nozzle.

[0009] In one alternative implementation, the auxiliary spray arm is rotatably engaged and limited on the main spray arm. Beneficial effects: The auxiliary spray arm is fixed to the main spray arm by a snap-fit ​​mechanism, eliminating the need for additional connecting parts, further simplifying the structure and facilitating disassembly and assembly.

[0010] In one optional implementation, the mass of the auxiliary spray arm is m1, the mass of the main spray arm is m2, and m1 / m2 < 1:2. Beneficial effects: Since the rotation of the auxiliary spray arm will affect the rotation of the main spray arm through the friction force generated by the latch, the mass of the auxiliary spray arm should not be too large. If the mass is too large, the friction force will be strong, which will lead to excessive inertia and affect the rotation of the main spray arm. In this embodiment, by limiting the mass ratio of the auxiliary spray arm to the main spray arm to less than 1:2, the problem of the auxiliary spray arm mass affecting the rotation of the main spray arm can be effectively avoided.

[0011] In one alternative implementation, the rotational speed of the auxiliary spray arm is n1, the rotational speed of the main spray arm is n2, and 1.5 < n1 / n2 < 2.

[0012] Beneficial effects: The cross-shaped planetary auxiliary spray arm design allows for high spray frequency, thus eliminating the need for excessively high auxiliary spray arm speeds. By setting the speed ratio between the auxiliary and main spray arms to between 1.5 and 2, the cleaning effect of the auxiliary spray arms is ensured while minimizing the impact on the rotation of the main spray arm. By limiting the speed ratio between the auxiliary and main spray arms within this range, one rotation of the main spray arm is sufficient to cover the entire washing area. For a linear auxiliary spray arm, a higher speed ratio might be required, which could easily lead to unstable operation. This necessitates a costly and complex bearing structure and parameter limitations to ensure stable and effective operation of the spray arm.

[0013] In one alternative embodiment, a first nozzle is provided on both the top and bottom surfaces of the main spray arm.

[0014] Beneficial effects: By setting first nozzles on both the top and bottom surfaces of the main spray arm, it is possible not only to clean the tableware located above the spray arm assembly, but also to clean the filter screen located below the spray arm assembly.

[0015] Secondly, this utility model also provides a dishwasher, including an inner tub and a spray arm assembly of any of the above embodiments installed inside the inner tub; the dishwasher is provided with a mounting sleeve for installing the spray arm assembly. The main spray arm is equipped with a water inlet column, which is limited in the axial direction within the mounting sleeve and can rotate freely in the circumferential direction within the mounting sleeve. Beneficial effect: The installation sleeve facilitates the connection between the rotating spray arm assembly and the external water inlet mechanism.

[0016] In one optional implementation, one end of the water inlet column is connected to the main body of the main spray arm, and the other end forms a water inlet. The inner circumference of the end of the mounting sleeve near the water inlet is provided with an annular rib. The mounting sleeve is fitted onto the outer circumference of the water inlet column, and the annular rib abuts and limits the movement against the outer side of the end wall of the water inlet column.

[0017] Beneficial effect: The annular ribs provided inside the mounting sleeve can abut against and limit the outer side of the end wall of the water inlet column, thereby restricting the axial displacement of the mounting sleeve towards the water inlet column.

[0018] In one optional embodiment, a snap-fit ​​protrusion is provided on the outer peripheral wall of the water inlet column, and a limit buckle is provided inside the mounting sleeve. The limit buckle is adapted to engage with the side wall of the snap-fit ​​protrusion away from the water inlet.

[0019] Beneficial effects: The limiting buckle set inside the mounting sleeve can cooperate with the locking protrusion on the outer wall of the water inlet column to limit the displacement of the mounting sleeve away from the water inlet column in the axial direction. This ensures that the mounting sleeve and the water inlet column are stably matched in the axial direction and will not move back and forth in the axial direction, effectively preventing the spray arm assembly from coming out of the mounting sleeve. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of one embodiment of the present invention after the spray arm assembly and the mounting sleeve are assembled; Figure 2 for Figure 1 An exploded view from one perspective; Figure 3 for Figure 1 An exploded view from another perspective; Figure 4 for Figure 1 Top view; Figure 5 for Figure 4 A cross-sectional view along the AA direction; Figure 6 for Figure 5 Enlarged view of point B in the middle; Figure 7 for Figure 5 Enlarged view of the mating point between the central water inlet column and the mounting sleeve; Figure 8 This is a structural schematic diagram of the spray arm assembly from one perspective in an embodiment of this utility model; Figure 9 This is a schematic diagram of the auxiliary spray arm in an embodiment of the present invention; Figure 10 This is a front view of the auxiliary spray arm in an embodiment of this utility model; Figure 11 This is a schematic diagram of the sub-spray arm with its bottom facing upwards in an embodiment of this utility model; Figure 12 for Figure 11 Exploded view; Figure 13 for Figure 11 Top view; Figure 14 This is the trajectory diagram of the outermost part of the auxiliary spray arm; Figure 15 This is a simulation diagram of the jet flow from the spray arm assembly.

[0022] Explanation of reference numerals in the attached figures: 1. Main spray arm; 1a. Main body section; 1b. Lowering section; 10. Assembly hole; 101. Assembly interface; 11. First nozzle; 12. Water inlet column; 121. Snap-fit ​​protrusion; 2. Secondary spray arm; 2a. Upper cover; 2b. Lower cover; 21. Second nozzle; 22. Snap-fit ​​part; 221. Water inlet interface; 222. Snap-fit; 2221. Snap-fit ​​surface; 2222. Guide surface; 23. Diversion protrusion; 3. Install sleeve; 31. Circular rib; 32. Limit buckle. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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.

[0026] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0027] Current industry research has found that 30 rpm is optimal for conventional single-bar spray arms. Simulation studies of three-pronged planetary spray arms show that once the rotation speed reaches a certain ratio, the cleaning effect no longer changes significantly. However, if the rotation speed of the auxiliary spray arm is too high, it may cause the main spray arm to operate unstably, disrupting the force balance and causing the main spray arm to stop rotating, thus affecting the cleaning effect and also increasing the complexity of the design.

[0028] Some patents disclose a non-coaxial conventional drive planetary spray arm, in which the disclosed secondary spray arm is a straight spray arm with a main-to-secondary spray arm speed ratio of less than 1:2. However, it is generally believed that the optimal speed of a conventional straight spray arm is around 30 rpm. If the secondary spray arm speed exceeds 60 rpm, the rotation of the secondary spray arm will affect the rotation of the main spray arm, and if the secondary spray arm rotates too fast, the excessively high speed may affect the cleaning effect of the secondary spray arm.

[0029] Although some patents use a cross-shaped auxiliary spray arm, which can increase the spraying frequency of the auxiliary spray arm and reduce the impact of excessive rotation speed of the auxiliary spray arm, the nozzles on the disclosed auxiliary spray arm are symmetrically arranged, which results in a single and dispersed water flow sweeping path, which easily creates cleaning dead zones and poor cleaning effect.

[0030] Furthermore, existing auxiliary spray arms deform downwards at their ends due to the gravity of the water during rotation, easily causing interference with the main spray arm. Moreover, most existing auxiliary spray arms are connected to the main spray arm via bearings and other components, resulting in complex structures, difficult assembly, and increased weight.

[0031] The following is combined Figures 1 to 15 The following describes embodiments of the present invention.

[0032] According to an embodiment of the present invention, in one aspect, the present invention provides a spray arm assembly, including a main spray arm 1 and a secondary spray arm 2. The main spray arm 1 is adapted to rotate around a first rotation axis; the secondary spray arm 2 is adapted to be rotatably disposed on the main spray arm 1 around a second rotation axis, wherein the first rotation axis and the second rotation axis are not coaxial; the main spray arm 1 is a straight spray arm, and a first nozzle 11 is disposed on the main spray arm 1, and the secondary spray arm 2 and the first nozzle 11 are distributed on both sides of the first rotation axis; the secondary spray arm 2 has four branch spray arms distributed in a cross shape, and a second nozzle 21 is disposed on each of the four branch spray arms, wherein the second nozzles 21 on at least two opposite branch spray arms are asymmetrically disposed.

[0033] In the above embodiment, the auxiliary spray arm 2 adopts a cross planetary spray arm design. Compared with the straight auxiliary spray arm 2, the cross auxiliary spray arm 2 can provide a more three-dimensional water flow, improve the jet coverage, and achieve better cleaning effect. In addition, the second nozzles 21 on at least two of the four branch spray arms of the auxiliary spray arm 2 are asymmetrically arranged, resulting in more diverse sweeping paths, denser and more three-dimensional water flow. This allows for secondary removal of some unwashed areas on the surface of the tableware and residues left by the main spray arm 1, further improving the cleaning effect of the tableware. It should be explained that in this embodiment, "the second nozzles 21 on at least two opposite branch spray arms are asymmetrically arranged" means that the positions of the second nozzles 21 are asymmetrical. More specifically, the number of second nozzles 21 on the opposite branch spray arms is the same, and the positions of the second nozzles 21 on the opposite branch spray arms are asymmetrical with respect to the second rotation axis.

[0034] Furthermore, it should be explained that in this embodiment, "the first rotation axis and the second rotation axis are not coaxial" means that the first rotation axis and the second rotation axis are two completely different straight lines separated in space. They do not coincide and are not the same line. This design allows the main spray arm 100 and the auxiliary spray arm 200 to have their own independent rotation centers with different spatial positions, thereby achieving a complex and efficient composite motion trajectory, expanding the cleaning range, and enhancing the washing effect. Compared with traditional single spray arms or coaxial double spray arms, the auxiliary spray arm can extend the water flow to areas that the main spray arm cannot effectively cover during normal rotation, such as the corners of the dishwasher and the back of the upper tableware in the dish rack. The complex water flow path greatly reduces cleaning blind spots and ensures that all sides of the tableware can be repeatedly rinsed by the water flow, especially for tableware with irregular shapes or closely placed.

[0035] Based on the above embodiment, as a further defined embodiment, each of the four branch spray arms is provided with a plurality of second nozzles 21 at intervals. The four branch spray arms include opposing first and second branch spray arms, as well as opposing third and fourth branch spray arms, wherein the number of second nozzles 21 on the first branch spray arm is the same as the number of second nozzles 21 on the second branch spray arm, and the position of at least one set of second nozzles 21 is asymmetrical with respect to the second rotation axis. The spray directions of the second nozzles 21 on the first branch spray arm and the second nozzles 21 on the second branch spray arm are different.

[0036] Furthermore, the number of second nozzles 21 on the third branch spray arm is the same as the number of second nozzles 21 on the fourth branch spray arm, and their positions are asymmetrical relative to the second rotation axis. The second nozzles 21 on the side of the third branch spray arm near the middle part have different spray directions than the second nozzles 21 on the side of the third branch spray arm near the middle part, and the spray directions of the other nozzles are opposite. Through the above design, while driving the auxiliary spray arm 2 to rotate, it is also possible to clean the tableware from different directions on the inside and outside, further improving the cleaning effect of the tableware.

[0037] In one optional embodiment, the main spray arm 1 includes a spray arm body, which includes a main body section 1a and a lower section 1b; the lower section 1b is lower than the main body section 1a, and the auxiliary spray arm 2 is mounted on the lower section 1b.

[0038] In the above embodiment, the main spray arm 1, by employing a main body section 1a and a lowered section 1b with different heights, and installing the auxiliary spray arm 2 on the lowered section 1b, ensures the mass balance of the entire spray arm assembly. This allows the center of gravity of the entire spray arm assembly to fall on the first rotation axis, guaranteeing the balance and stability of the spray arm assembly during rotation. This effectively avoids the problem of the center of gravity of the entire spray arm assembly shifting towards the auxiliary spray arm 2 due to its installation, which would cause the entire spray arm assembly to become unbalanced and unable to rotate. Furthermore, this design also allows the second nozzles 21 on the main spray arm 1 and the auxiliary spray arm 2 to be located at the same height, facilitating installation layout.

[0039] Based on the above embodiments, as a further defined embodiment, a plurality of first nozzles 11 are spaced apart along the length direction on the main body of the spray arm located on one side of the first rotation axis. The main body section 1a and the sinking section 1b are both horizontally arranged, and the main spray arm 1 also includes an inclined section that is inclinedly connected between the main body section 1a and the sinking section 1b, with the main body section 1a and the sinking section 1b located on both sides of the first rotation axis.

[0040] In one optional embodiment, a first nozzle 11 is provided on the main body section 1a; the top surface of the end of the sinking section 1b away from the main body section 1a is provided with an assembly hole 10, and the auxiliary spray arm 2 is rotatably connected in the assembly hole 10 and communicates with the inner cavity of the main spray arm 1.

[0041] In the above embodiment, a first nozzle 11 is provided on the main body section 1a, and the auxiliary spray arm 2 is installed on the sinking section 1b, so that nozzles are provided in the entire length direction of the spray arm assembly, the sprayed water flow is more concentrated, the spray dead angle is reduced, and the auxiliary spray arm 2 is rotatably connected in the assembly hole 10, which facilitates the rotation of the auxiliary spray arm 2 by the second nozzle 21.

[0042] Based on the above embodiments, as a further defined embodiment, the orifice diameter of the first nozzle 11 is larger than that of the second nozzle 21. The surface of the main spray arm 1 is distributed with first nozzles 11 with larger orifice diameters, and the jet coverage of a single nozzle is wide, which can remove stains over a large area of ​​the tableware surface. The auxiliary spray arm 2 is designed in a cross shape, and the surface is distributed with second nozzles 21 with smaller orifice diameters but more in number, resulting in more diverse sweeping paths, denser and more three-dimensional water flow, which can perform secondary cleaning of some unwashed areas on the tableware surface and residues left by the main spray arm 1.

[0043] In one alternative embodiment, the auxiliary spray arm 2 is rotatably engaged and limited on the main spray arm 1. In the above embodiment, the auxiliary spray arm 2 is fixed to the main spray arm 1 by snap-fit, without the need for additional connecting parts, which further simplifies the structure and facilitates disassembly and assembly.

[0044] Specifically, the auxiliary spray arm 2 is rotatably locked onto the main spray arm 1 by a clip 222. The specific installation method of the auxiliary spray arm 2 and the specific structure of the clip 222 will be described in detail later.

[0045] In one optional embodiment, the mass of the auxiliary spray arm 2 is m1, the mass of the main spray arm 1 is m2, and m1 / m2 < 1:2. In the above embodiment, since the rotation of the auxiliary spray arm 2 will generate frictional force through the buckle 222 and affect the rotation of the main spray arm 1, the mass of the auxiliary spray arm 2 should not be too large. If the mass is too large, the frictional force will be strong, which will lead to excessive inertia and affect the rotation of the main spray arm 1. In this embodiment, by limiting the mass ratio of the auxiliary spray arm 2 to the main spray arm 1 to less than 1:2, the problem of the auxiliary spray arm 2 being too large and affecting the rotation of the main spray arm 1 can be effectively avoided.

[0046] In one optional embodiment, the rotational speed of the auxiliary spray arm 2 is n1, the rotational speed of the main spray arm 1 is n2, and 1.5 < n1 / n2 < 2.

[0047] In the above embodiment, the cross-shaped planetary auxiliary spray arm 2 design results in a high spray frequency, thus eliminating the need for excessively high auxiliary spray rotation speed. By setting the rotation speed ratio of the auxiliary spray arm 2 to the main spray arm 1 between 1.5 and 2, the cleaning effect of the auxiliary spray arm 2 is ensured while minimizing the impact on the rotation of the main spray arm 1. By limiting the rotation speed ratio of the auxiliary spray arm 2 to the main spray arm 1 within the above range, combined with... Figure 14 As shown, the main spray arm 1 can cover the entire washing area with one rotation. For the single-line auxiliary spray arm 2, a higher speed ratio may be required, which can easily lead to unstable operation of the spray arm. Therefore, a costly and complex bearing structure and parameter limitation are required to ensure stable and effective operation of the spray arm.

[0048] In one optional embodiment, a first nozzle 11 is provided on both the top and bottom surfaces of the main spray arm 1.

[0049] In the above embodiment, by providing first nozzles 11 on both the top and bottom surfaces of the main spray arm 1, it is possible not only to clean the tableware located above the spray arm assembly, but also to clean the filter screen located below the spray arm assembly.

[0050] In one optional embodiment, the main spray arm 1 is provided with a mounting hole 10, and the auxiliary spray arm 2 is rotatably connected to the mounting hole 10 and communicates with the inner cavity of the main spray arm 1. The auxiliary spray arm 2 is provided with a snap-fit ​​part 22, which snaps into the mounting hole 10 and is rotatable within the mounting hole 10; the main spray arm 1 and the auxiliary spray arm 2 are connected to the mounting hole 10 through the snap-fit ​​part 22.

[0051] In the above embodiment, by providing a snap-fit ​​part 22 on the auxiliary spray arm 2 and rotatably snapping and limiting the snap-fit ​​part 22 in the assembly hole 10, the auxiliary spray arm 2 can be installed without the need for additional accessories, simplifying the structure, improving assembly efficiency, and effectively solving the problem that the existing auxiliary spray arm 2 is connected to the main spray arm 1 through accessories such as bearings, resulting in a complex overall structure, high assembly difficulty, and increased spray arm weight.

[0052] In one alternative embodiment, the snap-fit ​​part 22 is integrally formed with the auxiliary spray arm 2, eliminating the need for additional accessories, simplifying the structure, reducing the number of parts, simplifying the production and assembly process, and reducing costs.

[0053] In one optional embodiment, the locking part 22 includes a water inlet 221 and a latch 222. The water inlet 221 is cylindrical, and its outer circumferential shape matches the inner circumferential shape of the mounting hole 10. The water inlet 221 can extend into the mounting hole 10 and communicate with the inner cavity of the main spray arm 1. The latch 222 is fixedly disposed on the water inlet 221. The latch 222 can deform under external force and extend into the mounting hole 10, and can recover its deformation and latch into the mounting hole 10 when the external force is removed.

[0054] In the above embodiment, the snap-fit ​​part 22 adopts the design of the water inlet interface 221 and the buckle 222. The water inlet interface 221 can extend into the assembly hole 10 and support the inner circumference of the assembly hole 10, realizing the connection between the auxiliary spray arm 2 and the main spray arm 1. The buckle 222 can retract inward and extend into the assembly hole 10 under the action of external force such as the squeezing force of the assembly hole 10. When the squeezing force disappears after extending into the assembly hole 10, it can expand outward and snap onto the inner side of the assembly hole 10, thereby limiting and fixing the auxiliary spray arm 2 in the axial direction of the assembly hole 10, preventing the auxiliary spray arm 2 from detaching from the main spray arm 1. Since the snap-fit ​​part 22 and the assembly hole 10 are not limited in the circumferential direction, the snap-fit ​​part 22 can drive the auxiliary spray arm 2 to rotate freely relative to the central axis of the assembly hole 10.

[0055] In one alternative embodiment, there are multiple snap fasteners 222, and the multiple snap fasteners 222 are arranged at circumferential intervals along the water inlet interface 221. In the above embodiment, by providing multiple snap fasteners 222 at circumferential intervals on the water inlet 221, the balance and stability of the auxiliary spray arm 2 during rotation can be further improved.

[0056] Preferably, there are four buckles 222, and the four buckles 222 are symmetrically distributed.

[0057] In one alternative implementation, such as Figure 5 and, Figure 6 , Figure 11 , Figure 12 As shown, the buckle 222 includes an elastic support rib and a snap-fit ​​rib. One end of the elastic support rib is fixed to the water inlet interface 221, and the other end is fixedly provided with a snap-fit ​​rib. The snap-fit ​​rib has a snap-fit ​​surface 2221 and a guide surface 2222. The snap-fit ​​surface 2221 is adapted to abut against the inner wall of the main spray arm 1 located on the outer periphery of the assembly hole 10. The guide surface 2222 is inclined and adapted to guide the buckle 222 into the assembly hole 10.

[0058] In the above embodiment, the buckle 222 is designed with elastic support ribs to facilitate deformation. The buckle 222 is provided with snap-fit ​​protrusions at the ends of the elastic support ribs. The snap-fit ​​protrusions adopt the design of snap-fit ​​surface 2221 and guide surface 2222. The snap-fit ​​surface 2221 can abut against the inner wall of the main spray arm 1 to achieve limiting and prevent the auxiliary spray arm 2 from detaching from the main spray arm 1. The guide surface 2222 can play a guiding role, making it convenient for the buckle 222 to extend into the assembly hole 10, improving assembly efficiency and avoiding jamming during the assembly process.

[0059] In one alternative embodiment, the circumferential edge of the mounting hole 10 extends away from the inner cavity of the main spray arm 1 to form a mounting interface 101; the extension length of the mounting interface 101 is less than the distance between the snap-fit ​​surface 2221 and the spray arm body of the auxiliary spray arm 2. In the above embodiment, the assembly interface 101 formed by extending the circumferential edge of the assembly hole 10 is supported and limited in the gap between the snap-fit ​​surface 2221 and the main body of the auxiliary spray arm 2, and abuts against the outer wall of the main body of the auxiliary spray arm 2, thereby further improving the stability of the auxiliary spray arm 2 structure and preventing the auxiliary spray arm 2 from swaying up and down in the axial direction of the assembly hole 10.

[0060] In one alternative implementation, such as Figure 6 , Figure 12 and Figure 13 As shown, a flow-diverting protrusion 23 is provided inside the auxiliary spray arm 2, and the flow-diverting protrusion 23 is provided corresponding to the snap-fit ​​part 22.

[0061] In the above embodiment, by providing a diversion protrusion 23 at the position corresponding to the snap-fit ​​part 22 inside the auxiliary spray arm 2, the diversion protrusion 23 can guide the water flow entering from the snap-fit ​​part 22 to the surrounding area and distribute the water flow to each branch spray arm of the auxiliary spray arm 2, thus avoiding the problem of water flow being concentrated and directed to one side, affecting the cleaning effect.

[0062] In one alternative implementation, such as Figure 12 , Figure 13 As shown, the auxiliary spray arm 2 includes a detachably connected upper cover 2a and a lower cover 2b; a snap-fit ​​part 22 is provided on the lower cover 2b, and a flow-diverting protrusion 23 is provided on the inner wall of the upper cover 2a and corresponds to the position of the snap-fit ​​part 22; the flow-diverting protrusion 23 is a convex structure with a high center and low periphery provided on the inner wall of the upper cover 2a.

[0063] In the above embodiment, the auxiliary spray arm 2 is designed with a detachable upper cover 2a and a lower cover 2b, which facilitates processing and forming. The diversion protrusion 23 adopts a convex hull structure with a high center and low periphery, which is simple in structure and has a good diversion effect.

[0064] In one alternative embodiment, the auxiliary spray arm 2 is mounted above the main spray arm 1, and the locking part 22 is provided on the bottom wall of the auxiliary spray arm 2; the bottom wall of the auxiliary spray arm 2 is constructed to be inclined in a gradually upward direction from the locking part 22 toward the end of the auxiliary spray arm 2. In the above embodiment, by constructing the bottom wall of the auxiliary spray arm 2 as an inclined shape that gradually slopes upward from the snap-fit ​​part 22 toward the end of the auxiliary spray arm 2, the flow channel inside the auxiliary spray arm 2 is gradually raised from the position of the middle snap-fit ​​part 22 toward the end. On the one hand, this ensures that when the spray arm assembly stops spraying, the water can flow back to the snap-fit ​​part 22 and then back to the main spray arm 1 through the assembly hole 10, avoiding water accumulation in the spray arm and water flowing out during user use, which would affect the user experience. On the other hand, since the auxiliary spray arm 2 is relatively long, by setting the bottom wall of the auxiliary spray arm 2 as an inclined shape that gradually slopes upward, it can avoid the main spray arm 1 during rotation, effectively preventing the far end of the spray arm from deforming during rotation and easily interfering with the main spray arm 1.

[0065] In one optional embodiment, the auxiliary spray arm 2 is a cross-shaped spray arm, and the snap-fit ​​part 22 is provided in the middle part of the auxiliary spray arm 2.

[0066] In the above embodiments, such as Figure 15 As shown, the cross-shaped auxiliary spray arm 2 can provide a more three-dimensional water flow than the straight auxiliary spray arm 2, resulting in a better cleaning effect. Furthermore, the snap-fit ​​part 22 is located in the middle of the auxiliary spray arm 2, which enables water to enter from the middle and then be diverted to the four branch spray arms via the diversion protrusion 23.

[0067] According to an embodiment of the present invention, another aspect provides a dishwasher, including an inner tub and a spray arm assembly of any of the above embodiments installed within the inner tub. The dishwasher is provided with a mounting sleeve 3 for mounting the spray arm assembly; a water inlet column 12 is provided on the main spray arm 1, the water inlet column 12 being axially capped within the mounting sleeve 3 and circumferentially rotatable within the mounting sleeve 3. In the above embodiment, the water inlet column 12 and the main spray arm 1 are integrally formed. The installation sleeve 3 facilitates the connection between the rotating spray arm assembly and the external water inlet mechanism.

[0068] In one optional embodiment, one end of the water inlet column 12 is connected to the main body of the spray arm 1, and the other end forms a water inlet; an annular rib 31 is provided on the inner circumference of the end of the mounting sleeve 3 near the water inlet, and the mounting sleeve 3 is fitted onto the outer circumference of the water inlet column 12, with the annular rib 31 abutting and limiting the movement of the mounting sleeve against the outer side of the end wall of the water inlet column 12. The annular rib provided inside the mounting sleeve abuts and limits the movement of the mounting sleeve against the outer side of the end wall of the water inlet column, thereby restricting the axial displacement of the mounting sleeve towards the water inlet column.

[0069] In one optional embodiment, a snap-fit ​​protrusion 121 is provided on the outer peripheral wall of the water inlet column 12, and a limit buckle 32 is provided inside the mounting sleeve 3. The limit buckle 32 is adapted to limit and cooperate with the side wall surface of the snap-fit ​​protrusion away from the water inlet.

[0070] In the above embodiment, the limiting buckle 32 provided in the mounting sleeve 3 can cooperate with the locking protrusion 121 on the outer wall of the water inlet column 12 to limit the displacement of the mounting sleeve away from the water inlet column in the axial direction, thereby making the mounting sleeve and the water inlet column stably cooperate in the axial direction and not move back and forth in the axial direction, effectively preventing the spray arm assembly from coming out of the mounting sleeve 3.

[0071] In order to solve the problem that some dishes are not cleaned properly in a dishwasher due to the increased number of dish sets and the denser arrangement of dishes, this embodiment provides a cross planetary spray arm assembly. The spray arm assembly consists of a main spray arm 1 and a secondary spray arm 2. The main spray arm 1 has a water inlet column 12 in the middle, and the lower opening of the water inlet column 12 is the water inlet of the entire spray arm. The main spray arm 1 is fixed by engaging with the limiting buckle 32 inside the mounting sleeve 3 inside the dishwasher through the snap-fit ​​protrusion 121 on the surface of the cylindrical water column.

[0072] Furthermore, the auxiliary spray arm 2 is connected to the main spray arm 1 via a snap-fit ​​222, thus fixing the auxiliary spray arm 2. A certain number of first nozzles 11 are distributed on one side of the rotation axis of the main spray arm 1, whose main functions are to clean tableware, clean the filter screen, and drive the main spray arm 1 to rotate. The auxiliary spray arm 2, which is a planetary cross shape, is distributed on the other side. The length of the auxiliary spray arm 2 is close to half the length of the main spray arm 1, and the same number of second nozzles 21 are asymmetrically distributed on its surface. The auxiliary spray arm 2 uses the second nozzles distributed on its surface to clean the tableware and rotate around its own rotation axis. Therefore, this spray arm can be classified as a conventional driven non-coaxial planetary spray arm. The auxiliary spray arm 2 is a four-pronged cross spray arm with four branch spray arms. The thickness of the branch spray arms gradually narrows from the inside to the outside along the length direction. The bottom wall of the branch spray arms gradually slopes upward from the center to the end. The flow channel inside the branch spray arms is gradually raised. This is to ensure that the water can flow back and avoid water accumulation in the spray arm. Secondly, because the auxiliary spray arm 2 is relatively long, it avoids the problem of deformation at the far end of the branch spray arms and interference with the main spray arm.

[0073] Furthermore, the main spray arm 1 features a first nozzle 11 with a large aperture, providing a wide jet coverage and effectively removing stains from a large area of ​​the tableware surface. The secondary spray arm 2 is designed in a cross shape with a larger number of nozzles with smaller apertures, resulting in more diverse sweeping paths and a denser, more three-dimensional water flow. This allows for secondary cleaning of unwashed areas and residues left by the main spray arm 1. This spray arm design not only improves the jet coverage but also solves the problem of the secondary spray arm 2 rotating too quickly and affecting the rotation of the main spray arm 1. Additionally, this application utilizes four symmetrically distributed clips 222 at the lower end of the secondary spray arm 2 to connect it to the main spray arm 1, simplifying the structure and reducing installation difficulty and cost.

[0074] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the protection scope of the embodiments of this application.

Claims

1. A spray arm assembly, characterized in that, include: The main spray arm (1) is adapted to rotate around the first rotation axis; The auxiliary spray arm (2) is adapted to be rotatably disposed on the main spray arm (1) about a second rotation axis, wherein the first rotation axis and the second rotation axis are not coaxial; The main spray arm (1) is a straight spray arm, and a first nozzle (11) is provided on the main spray arm (1). The auxiliary spray arm (2) and the first nozzle (11) are distributed on both sides of the first rotation axis. The auxiliary spray arm (2) has four branch spray arms distributed in a cross shape. Each of the four branch spray arms is provided with a second nozzle (21), and the second nozzles (21) on at least two opposite branch spray arms are asymmetrically arranged.

2. The spray arm assembly according to claim 1, characterized in that, The main spray arm (1) includes a spray arm body, which includes a main body section (1a) and a sinking section (1b). The sinking section (1b) is lower than the main body section (1a), and the auxiliary spray arm (2) is installed on the sinking section (1b).

3. The spray arm assembly according to claim 2, characterized in that, The top surface of the sinking section (1b) away from the main body section (1a) is provided with an assembly hole (10), and the auxiliary spray arm (2) is rotatably connected in the assembly hole (10) and communicates with the inner cavity of the main spray arm (1).

4. The spray arm assembly according to any one of claims 1 to 3, characterized in that, The auxiliary spray arm (2) is rotatably engaged and limited on the main spray arm (1).

5. The spray arm assembly according to any one of claims 1 to 3, characterized in that, The mass of the auxiliary spray arm (2) is m1, and the mass of the main spray arm (1) is m2, where m1 / m2 < 1:

2.

6. The spray arm assembly according to any one of claims 1 to 3, characterized in that, The rotational speed of the auxiliary spray arm (2) is n1, and the rotational speed of the main spray arm (1) is n2, where 1.5 < n1 / n2 < 2.

7. The spray arm assembly according to any one of claims 1 to 3, characterized in that, The first nozzle (11) is provided on both the top and bottom surfaces of the main spray arm (1).

8. A dishwasher, characterized in that, The dishwasher includes an inner liner and a spray arm assembly as described in any one of claims 1 to 7 installed inside the inner liner, wherein a mounting sleeve (3) for installing the spray arm assembly is provided inside the dishwasher. The main spray arm (1) is provided with a water inlet column (12), which is axially limited within the mounting sleeve (3) and can rotate freely within the mounting sleeve (3) in the circumferential direction.

9. The dishwasher according to claim 8, characterized in that, One end of the water inlet column (12) is connected to the main body of the main spray arm (1), and the other end forms a water inlet; The mounting sleeve (3) has an annular rib (31) on the inner circumference of one end near the water inlet. The mounting sleeve (3) is fitted around the outer circumference of the water inlet column (12), and the annular rib (31) abuts against and is limited to the outer side of the end wall of the water inlet column (12).

10. The dishwasher according to claim 9, characterized in that, The outer peripheral wall of the water inlet column (12) is provided with a snap-fit ​​protrusion (121), and the mounting sleeve (3) is provided with a limit buckle (32). The limit buckle (32) is adapted to limit and cooperate with the side wall of the snap-fit ​​protrusion (121) away from the water inlet.

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