Gushing arm assembly and dish washing machine

Abstract

The utility model discloses a gushing arm assembly and a dish-washing machine, the gushing arm assembly comprises a rotatable gushing arm which is provided with a first flow channel, a second flow channel and a containing cavity, and the containing cavity is provided with a first through hole and a second through hole; the fixing part is fixedly arranged in the accommodating cavity and comprises a first guide surface and a second guide surface; the moving part is arranged on the fixed part in a manner of moving up and down and comprises a third guide surface and a fourth guide surface; the plugging piece is movably arranged in the containing cavity, the first guide face, the third guide face, the second guide face and the fourth guide face are sequentially arranged around the rotating axis of the spraying arm, and the starting ends of the first guide face, the third guide face, the second guide face and the fourth guide face are higher than the tail ends in the moving direction of the plugging piece. The moving part moves so that the plugging part can move and has a first plugging state for plugging the first through hole and conducting the second through hole and a second plugging state for plugging the second through hole and conducting the first through hole. According to the gushing arm assembly, a reversing structure for controlling water flow to flow to the first flow channel or the second flow channel can be simplified, and the gushing arm assembly is easy to achieve.

Description

Technical Field

[0001] The utility model relates to the technical field of dishwashers, and more specifically, to a spray arm assembly and a dishwasher. Background Art

[0002] With the improvement of people's material living standards, dishwashers that can liberate hands are gradually becoming a standard for quality life. Compared with traditional hand washing, dishwashers have advantages such as clean washing, sterilization, water saving and labor saving. Household dishwashers generally adopt a spray washing method. Driven by a washing pump, water flows through a rotating spray arm to spray and wash the surface of tableware.

[0003] In the related art, for a spray arm with a double flow channel, the commutation structure for controlling the water flow to alternatively flow into the two flow channels is relatively complex and has poor practicability. Summary of the Utility Model

[0004] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, an object of the utility model is to provide a spray arm assembly, which includes a spray arm with a double flow channel, and the commutation structure for controlling the water flow to alternatively flow into the two flow channels is relatively simple, easy to implement and has strong practicability.

[0005] Another object of the utility model is to provide a dishwasher with the above spray arm assembly.

[0006] According to the embodiment of the utility model, the spray arm assembly includes: a spray arm, the spray arm has a first flow channel and a second flow channel for circulating liquid, the spray arm is provided with a accommodating chamber, the peripheral wall of the accommodating chamber is provided with a first through hole connected to the first flow channel and a second through hole connected to the second flow channel, and the spray arm is rotatable around a rotation axis; a fixing member, the fixing member is fixed in the accommodating chamber, the top surface of the fixing member includes a first guide surface and a second guide surface; a moving member, the moving member is movably arranged on the fixing member up and down, the top surface of the moving member includes a third guide surface and a fourth guide surface, the first guide surface, the third guide surface, the second guide surface and the fourth guide surface are arranged in sequence around the rotation axis of the spray arm; a blocking member, the blocking member is movably arranged in the accommodating chamber, the The moving member moves to change the height position of the third guide surface and the fourth guide surface relative to the first guide surface and the second guide surface, so that the blocking member can move along the first guide surface, the third guide surface, the second guide surface and the fourth guide surface. In the moving direction of the blocking member, the heights of the starting ends of the first guide surface, the third guide surface, the second guide surface and the fourth guide surface are all higher than the heights of the ending ends, so that the blocking member moves from the starting end to the ending end, and the blocking member has a first blocking state and a second blocking state, wherein, in the first blocking state, the blocking member blocks the first through hole, and the second through hole is connected; in the second blocking state, the blocking member blocks the second through hole, and the first through hole is connected.

[0007] According to the spray arm assembly of the embodiment of the utility model, the blocking member can be moved along the first guide surface, the third guide surface, the second guide surface and the fourth guide surface through the up and down movement of the movable member relative to the fixed member and the guiding effect of the four guide surfaces on the blocking member, so that the blocking member can be switched between the first blocking state and the second blocking state, which is beneficial to simplify the reversing structure of the spray arm assembly for controlling the water flow to the first flow channel or the second flow channel and is easy to implement.

[0008] In addition, the spray arm assembly according to the above embodiment of the utility model may also have the following additional technical features:

[0009] According to some embodiments of the utility model, in a direction perpendicular to the rotation axis of the spray arm, the first through hole is located on a side of the third guide surface away from the rotation axis of the spray arm, and the second through hole is located on a side of the fourth guide surface away from the rotation axis of the spray arm; or, in a direction perpendicular to the rotation axis of the spray arm, the first through hole is located on a side of the first guide surface away from the rotation axis of the spray arm, and the second through hole is located on a side of the second guide surface away from the rotation axis of the spray arm.

[0010] According to some embodiments of the present utility model, the fixing member includes two guiding surfaces, namely the first guiding surface and the second guiding surface, the moving member includes two guiding surfaces, namely the third guiding surface and the fourth guiding surface, and the first guiding surface, the third guiding surface, the second guiding surface, the fourth guiding surface, and the first guiding surface are arranged in a cyclic order around the rotation axis of the spray arm.

[0011] According to some embodiments of the present utility model, in the arrangement direction, the heights of the first guiding surface, the second guiding surface, the third guiding surface, and the fourth guiding surface all gradually decrease from the starting end to the ending end.

[0012] According to some embodiments of the present utility model, the moving member can reciprocate between a first position and a second position, the first position is higher than the second position, and in the first blocking state and the second blocking state, the moving member is in the second position. Among them, in the first position, the ending end of the third guiding surface is not lower than the starting end of the second guiding surface, the ending end of the fourth guiding surface is not lower than the starting end of the first guiding surface, the ending end of the first guiding surface is lower than the starting end of the third guiding surface, and the ending end of the second guiding surface is lower than the starting end of the fourth guiding surface; in the second position, the ending end of the first guiding surface is not lower than the starting end of the third guiding surface, the ending end of the second guiding surface is not lower than the starting end of the fourth guiding surface, the ending end of the third guiding surface is lower than the starting end of the second guiding surface, and the ending end of the fourth guiding surface is lower than the starting end of the first guiding surface.

[0013] According to some embodiments of the present utility model, the spray arm assembly further includes a reset member, the reset member is connected to the moving member, and the reset member applies an upward driving force to the moving member. The moving member is configured to move from the first position to the second position under the action of water pressure; in the state where water supply stops, the moving member moves from the second position to the first position under the drive of the reset member.

[0014] According to some embodiments of the present utility model, the fixing member includes a first boss, a second boss and a water guiding portion. The water guiding portion has a water guiding channel. Both the first boss and the second boss are connected to the lower end of the water guiding portion. The upper surface of the first boss is the first guiding surface, and the upper surface of the second boss is the second guiding surface. Two first water passing openings are formed between the first boss and the second boss in the circumferential direction of the water guiding portion. The moving member includes a third boss, a fourth boss and a water blocking portion. Both the third boss and the fourth boss are connected to the upper end of the water blocking portion. The upper surface of the third boss is the third guiding surface, and the upper surface of the fourth boss is the fourth guiding surface. The water blocking portion is movably located below the water guiding portion. The moving member can reciprocate between a first position and a second position. The first position is higher than the second position. In the first position, the third boss and the fourth boss respectively block the two first water passing openings. In the second position, the third boss and the fourth boss at least partially open the corresponding first water passing openings, so that the first water passing openings communicate with the space above the third guiding surface or the fourth guiding surface and the water guiding channel.

[0015] According to some embodiments of the present utility model, a guiding groove axially opposite to the first water passing opening is provided on the outer peripheral surface of the water guiding portion. The guiding groove extends in the up and down direction. The upper ends of the third boss and the fourth boss are respectively provided with guiding portions. The guiding portions are movably embedded in the guiding groove. And the guiding portions are provided with second water passing openings. In the second position, the second water passing openings communicate with the space above the third guiding surface or the fourth guiding surface and the first water passing openings.

[0016] According to some embodiments of the present utility model, in the first position, the water blocking portion abuts against the lower end surface of the water guiding portion. A limiting boss is provided on the bottom wall of the accommodating cavity. In the second position, the water blocking portion abuts against the limiting boss.

[0017] According to some embodiments of the present utility model, a drain hole is provided on the bottom wall of the accommodating cavity.

[0018] According to some embodiments of the present utility model, a boss is provided on the bottom wall of the accommodating cavity. The boss divides the accommodating cavity into a plurality of sub-cavities. The drain hole is provided on the bottom wall of each sub-cavity.

[0019] According to some embodiments of the present utility model, a drainage cavity is provided in the third boss and / or the fourth boss. The drainage cavity has a bottom opening communicating with the accommodating cavity. The third boss has a first side wall connected to the starting end of the third guiding surface. The fourth boss has a second side wall connected to the starting end of the fourth guiding surface. The first side wall and / or the second side wall are provided with first drainage openings communicating with the drainage cavity.

[0020] According to some embodiments of the present utility model, the third boss and / or the fourth boss have a drainage cavity, the drainage cavity has a bottom opening communicating with the accommodation cavity, the third boss has a first inner peripheral wall connected to one end of the third guiding surface close to the water blocking portion, the fourth boss has a second inner peripheral wall connected to one end of the fourth guiding surface close to the water blocking portion, the first inner peripheral wall and / or the second inner peripheral wall are provided with communication ports communicating with the drainage cavity, the lower end surface of the water guiding portion is provided with a recess communicating with the first water passing port, in the first position, the water blocking portion abuts against the lower end surface of the water guiding portion, and the water blocking portion is spaced apart from the bottom surface of the recess, and the recess communicates the communication port and the water guiding channel.

[0021] According to some embodiments of the present utility model, a drainage cavity is provided in the third boss and / or the fourth boss, the drainage cavity has a bottom opening communicating with the accommodation cavity, the third boss has a first outer peripheral wall connected to one end of the third guiding surface away from the water blocking portion, the fourth boss has a second outer peripheral wall connected to one end of the fourth guiding surface away from the water blocking portion, the first outer peripheral wall and / or the second outer peripheral wall are provided with avoidance openings, and in the first position, the first through hole and / or the second through hole are radially opposite and communicated with the avoidance openings.

[0022] According to some embodiments of the present utility model, the spray arm includes a connecting portion and two arm portions, the two arm portions are respectively located on both sides of the connecting portion along a first horizontal direction, and the spray arm is rotatable around the center line of the connecting portion, the first flow channel communicates with the outside through a plurality of first spray holes, the second flow channel communicates with the outside through a plurality of second spray holes, the opening directions of the plurality of first spray holes along the circumferential direction of the spray arm are the same, the opening directions of the plurality of second spray holes along the circumferential direction of the spray arm are the same, and the opening directions of the first spray holes and the second spray holes located on the same arm portion are opposite along the circumferential direction of the spray arm.

[0023] According to some embodiments of the present utility model, the first flow channel and the second flow channel are arranged at intervals along a second horizontal direction, the second horizontal direction is perpendicular to the first horizontal direction, and the plurality of first spray holes and the plurality of second spray holes are respectively distributed on both sides of the rotation axis of the spray arm.

[0024] The dishwasher according to the embodiment of the present utility model includes a spray arm assembly according to the embodiment of the present utility model.

[0025] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0026] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0027] Figure 1 is a schematic structural diagram of a spray arm assembly and a connecting pipe assembly according to an embodiment of the present utility model;

[0028] Figure 2 is Figure 1 the front view of

[0029] Figure 3 is Figure 2 a partial cross-sectional view taken along the direction shown by line A-A, wherein the plugging member is located on the first guiding surface;

[0030] Figure 4 is Figure 1 a partial cross-sectional view of

[0031] Figure 5 is Figure 2 a partial cross-sectional view taken along the direction shown by line B-B, wherein the plugging member is located on the first guiding surface;

[0032] Figure 6 is Figure 2 a partial cross-sectional view taken along the direction shown by line C-C;

[0033] Figure 7 is Figure 2 a partial cross-sectional view taken along the direction shown by line A-A, wherein the plugging member is located on the third guiding surface;

[0034] Figure 8 is Figure 1 a partial cross-sectional view of

[0035] Figure 9 is Figure 2 a cross-sectional view taken along the direction shown by line B-B, wherein the plugging member is located on the third guiding surface;

[0036] Figure 10 is a schematic structural diagram of a fixing member, a moving member and a plugging member according to an embodiment of the present utility model, wherein the plugging member is located on the first guiding surface;

[0037] Figure 11 is a schematic structural diagram of a fixing member, a moving member and a plugging member according to an embodiment of the present utility model, wherein the plugging member is located on the second guiding surface;

[0038] Figure 12 is a schematic structural diagram of a fixing member, a moving member and a plugging member according to an embodiment of the present utility model, wherein the plugging member is located on the third guiding surface;

[0039] Figure 13 It is a schematic structural diagram of a fixing member, a moving member and a plugging member according to an embodiment of the present utility model, wherein the plugging member is located on the fourth guiding surface;

[0040] Figure 14 It is an exploded view of a spray arm assembly and a connecting pipe assembly according to an embodiment of the present utility model;

[0041] Figure 15 is Figure 14 a bottom view of;

[0042] Figure 16 It is a schematic structural diagram of a fixing member according to an embodiment of the present utility model;

[0043] Figure 17 is Figure 16 a bottom view of;

[0044] Figure 18 It is a schematic structural diagram of a moving member according to an embodiment of the present utility model;

[0045] Figure 19 is Figure 18 a bottom view of.

[0046] Reference numerals:

[0047] spray arm assembly 100; connecting pipe assembly 200;

[0048] spray arm 10; first flow channel 11; first spray hole 111; second flow channel 12; second spray hole 121; receiving cavity 13; first through hole 131; second through hole 132; limiting convex portion 133; drain hole 134; convex portion 135; sub-cavity 136; connecting portion 14; arm portion 15; partition plate 16; rotation axis F1;

[0049] fixing member 20; first convex platform 21; first guiding surface 211; third side wall 212; third drain port 213; second convex platform 22; second guiding surface 221; fourth side wall 222; water guiding portion 23; water guiding channel 231; guiding groove 232; concave portion 233; inner cavity 25;

[0050] moving member 30; third convex platform 31; third guiding surface 311; first side wall 312; first inner peripheral wall 313; first outer peripheral wall 314; fourth convex platform 32; fourth guiding surface 321; second side wall 322; second inner peripheral wall 323; second outer peripheral wall 324; water blocking portion 33; guiding portion 34; second water passing port 341; drainage cavity 35; first drain port 36; second drain port 37; communication port 38; avoidance port 39;

[0051] plugging member 40; reset member 50; guiding column 51. Detailed implementation manners

[0052] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals indicate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0053] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by 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. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0054] In the description of the present utility model, the "first feature" and "second feature" may include one or more of such features. The meaning of "a plurality" is two or more. The first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. The first feature being "above", "above" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature.

[0055] The spray arm assembly 100 and the dishwasher according to the embodiments of the present utility model will be described below with reference to the accompanying drawings.

[0056] Referring to Figures 1 - 19 As shown, the dishwasher according to the embodiments of the present utility model may include the spray arm assembly 100 according to the embodiments of the present utility model. The spray arm assembly 100 may include a spray arm 10, a fixing member 20, a moving member 30, and a blocking member 40.

[0057] Specifically, the spray arm 10 has a first flow channel 11 and a second flow channel 12 for liquid to flow through. The spray arm 10 is provided with a receiving cavity 13. The peripheral wall of the receiving cavity 13 is provided with a first through hole 131 communicating with the first flow channel 11 and a second through hole 132 communicating with the second flow channel 12. The spray arm 10 is rotatable about a rotation axis F1.

[0058] The fixing member 20 is fixedly arranged in the accommodating cavity 13. The top surface of the fixing member 20 includes a first guiding surface 211 and a second guiding surface 221. The moving member 30 is arranged on the fixing member 20 in a vertically movable manner. The top surface of the moving member 30 includes a third guiding surface 311 and a fourth guiding surface 321. The first guiding surface 211, the third guiding surface 311, the second guiding surface 221, and the fourth guiding surface 321 are arranged in sequence around the rotation axis F1 of the spray arm 10.

[0059] The blocking member 40 is movably arranged in the accommodating cavity 13. The moving member 30 moves to change the height positions of the third guiding surface 311 and the fourth guiding surface 321 relative to the first guiding surface 211 and the second guiding surface 221, so that the blocking member 40 can move along the first guiding surface 211, the third guiding surface 311, the second guiding surface 221, and the fourth guiding surface 321. In the moving direction of the blocking member 40, the heights of the starting ends of the first guiding surface 211, the third guiding surface 311, the second guiding surface 221, and the fourth guiding surface 321 are all higher than those of the ending ends, so that the blocking member 40 moves from the starting end to the ending end, and the blocking member 40 has a first blocking state and a second blocking state.

[0060] Wherein, in the first blocking state, the blocking member 40 blocks the first through hole 131, and the second through hole 132 is conducted; in the second blocking state, the blocking member 40 blocks the second through hole 132, and the first through hole 131 is conducted.

[0061] The spray arm assembly 100 can introduce liquids such as water and cleaning agents according to user needs. For the convenience of understanding, the following description takes the introduction of water as an example. For example, water can be introduced into the accommodating cavity 13 of the spray arm assembly 100, and the start and stop, flow rate, etc. of the introduced water can be controlled. The water introduced into the accommodating cavity 13 can flow to the first flow channel 11 through the first through hole 131, or can flow to the second flow channel 12 through the second through hole 132. The water flowing into only one of the two flow channels can make the spray arm 10 rotate around the rotation axis F1. For example, the spray arm 10 is pushed to rotate by the reaction force of the water jet sprayed to the outside in the flow channel.

[0062] The extending direction of the rotation axis F1 can be the up-and-down direction, a direction at a certain angle to the up-and-down direction, etc. For example, in some specific embodiments, as Figures 1 - 9 shown, the extending direction of the rotation axis F1 is the up-and-down direction. When water flows to the first flow channel 11 and the second flow channel 12 is not supplied with water, the spray arm 10 rotates around the rotation axis F1 in the clockwise direction; when water flows to the second flow channel 12 and the first flow channel 11 is not supplied with water, the spray arm 10 rotates around the rotation axis F1 in the counterclockwise direction.

[0063] The fixing member 20 can be integrally formed with the spray arm 10, so that the fixing member 20 and the spray arm 10 are not likely to move relative to each other or even separate. The fixing member 20 can also be fixedly installed in the accommodation cavity 13 of the spray arm 10 by means of welding, bolt connection, etc., which is convenient for cleaning and replacing the fixing member 20.

[0064] The first guiding surface 211, the third guiding surface 311, the second guiding surface 221 and the fourth guiding surface 321 are arranged in sequence around the rotation axis F1 of the spray arm 10, which is conducive to changing the height positions of the third guiding surface 311 and the fourth guiding surface 321 relative to the first guiding surface 211 and the second guiding surface 221 as the moving member 30 moves up and down relative to the fixing member 20, that is, changing the height positions of two adjacent guiding surfaces. For example, it is convenient for the blocking member 40 on the guiding surface to move downward to another guiding surface with a lower adjacent height, and it is convenient for the blocking member 40 on the guiding surface to be blocked by an adjacent guiding surface with a higher height and stay on the current guiding surface.

[0065] It can be understood that the spray arm 10 rotates around the rotation axis F1 in any direction. For example, Figure 1 as shown, the spray arm 10 rotates around the rotation axis F1 clockwise or counterclockwise, and the height positions of the third guiding surface 311 and the fourth guiding surface 321 relative to the first guiding surface 211 and the second guiding surface 221 can be changed by the up and down movement of the moving member 30 relative to the fixing member 20, which is convenient for realizing the movement of the blocking member 40 along the four guiding surfaces.

[0066] At the same time, in the moving direction of the blocking member 40, the heights of the starting ends of the first guiding surface 211, the third guiding surface 311, the second guiding surface 221 and the fourth guiding surface 321 are all higher than the heights of the ending ends, so that the blocking member 40 moves from the starting end to the ending end.

[0067] The blocking member 40 on the guiding surface can move from the starting end of the current guiding surface to the ending end of the current guiding surface under the action of its own gravity and the guiding action of the starting end and the ending end on the guiding surface. Combining the guiding action of the guiding surface and the sequential arrangement of the first guiding surface 211, the third guiding surface 311, the second guiding surface 221 and the fourth guiding surface 321 around the rotation axis F1 of the spray arm 10 enables the blocking member 40 to move downward from one guiding surface to another guiding surface with a lower adjacent height position, without the need to add other components to drive the blocking member 40 to move between the four guiding surfaces, which is conducive to simplifying the structure and is easy to realize the movement of the blocking member 40 on the four guiding surfaces and between the four guiding surfaces, and has strong practicability.

[0068] Among them, the height refers to the height position in the vertical direction. The moving direction of the blocking member 40 refers to the moving direction of the blocking member 40 along the first guiding surface 211, the third guiding surface 311, the second guiding surface 221 and the fourth guiding surface 321. For example, in some embodiments, such as Figure 10As shown, the moving direction of the plugging member 40 is Figure 10 the counterclockwise direction shown in Figure 10 . The plugging member 40 can sequentially move in a cycle along the first guiding surface 211, the third guiding surface 311, the second guiding surface 221, the fourth guiding surface 321, and the first guiding surface 211. For example, in some embodiments, the moving direction of the plugging member 40 is the clockwise direction, and the plugging member 40 can sequentially move in a cycle along the first guiding surface 211, the fourth guiding surface 321, the second guiding surface 221, the third guiding surface 311, and the first guiding surface 211.

[0069] The guiding function of the guiding surface means that the height of the starting end of the guiding surface is higher than that of the ending end, so that the object on the guiding surface can easily move downward from the starting end of the guiding surface to the ending end of the guiding surface. The starting end and the ending end of the guiding surface can be understood as the two ends that the plugging member 40 reaches successively on the guiding surface, that is, on the same guiding surface, the plugging member 40 reaches the starting end first and then the ending end.

[0070] For example, in some embodiments, as Figure 10 shown, the first guiding surface 211, the third guiding surface 311, the second guiding surface 221, and the fourth guiding surface 321 are arranged in sequence around the rotation axis F1 and are connected end to end, that is, the first guiding surface 211 and the fourth guiding surface 321 are connected, so that the plugging member 40 can sequentially move to the first guiding surface 211, the third guiding surface 311, the second guiding surface 221, and the fourth guiding surface 321. Then, the starting end of the first guiding surface 211 is the end close to the fourth guiding surface 321, the ending end of the first guiding surface 211 is the end close to the third guiding surface 311, the starting end of the third guiding surface 311 is the end close to the first guiding surface 211, and the ending end of the third guiding surface 311 is the end close to the second guiding surface 221. Similarly, the starting ends and the ending ends of the second guiding surface 221 and the fourth guiding surface 321 can be known, which will not be elaborated here.

[0071] The number of guiding surfaces included in the fixing member 20 is not limited, and the number of guiding surfaces included in the moving member 30 is not limited. For example, in some embodiments, as Figures 10 - 13 shown, the fixing member 20 includes two guiding surfaces, namely the first guiding surface 211 and the second guiding surface 221, and the moving member 30 includes two guiding surfaces, namely the third guiding surface 311 and the fourth guiding surface 321. The first guiding surface 211, the third guiding surface 311, the second guiding surface 221, the fourth guiding surface 321, and the first guiding surface 211 are sequentially arranged in a cycle around the rotation axis F1 of the spray arm 10, which can realize the movement of the plugging member 40 along the first guiding surface 211, the third guiding surface 311, the second guiding surface 221, the fourth guiding surface 321, and the first guiding surface 211 in sequence, while reducing the number of required guiding surfaces, facilitating the simplification of the structures of the fixing member 20 and the moving member 30, and reducing the cost.

[0072] Here, the first guide surface 211, the third guide surface 311, the second guide surface 221, the fourth guide surface 321, and the first guide surface 211 are arranged in a cycle in sequence, defining the arrangement direction of the first guide surface 211, the third guide surface 311, the second guide surface 221 and the fourth guide surface 321, and the four guide surfaces are arranged along the moving direction of the blocking member 40.

[0073] The height from the starting end to the end of the same guide surface can be gradually reduced or irregularly reduced. For example, in some embodiments, the guide surface has small grooves, small steps or small protrusions that are not likely to hinder the movement of the blocking member 40.

[0074] As another example, in some embodiments, Figures 10 - 13 As shown, in the arrangement direction, the heights of the first guide surface 211, the second guide surface 221, the third guide surface 311 and the fourth guide surface 321 gradually decrease from the starting end to the end, and the guide surfaces are formed into relatively smooth arc surfaces or inclined surfaces, so that the blocking piece 40 on the same guide surface can reach the end more smoothly from the starting end, thereby facilitating the movement of the blocking piece 40 from one guide surface to another adjacent guide surface with a lower height along the arrangement direction, thereby providing a better guiding effect on the blocking piece 40.

[0075] The size of the blocking member 40 is larger than the size of the two through holes so that the blocking member 40 can only block the through holes but cannot pass through the through holes. The blocking member 40 can be a small ball, an irregular cube, or other parts that can block the through holes. For example, in some embodiments, the blocking member 40 is a small ball made of stainless steel, which is heavy and is conducive to moving downward along the guide surface under its own gravity, thereby improving the reliability of the blocking member 40 moving along the four guide surfaces.

[0076] The blocking member 40 moves on the four guide surfaces and has a first blocking state and a second blocking state. In the first blocking state, the blocking member 40 blocks the first through hole 131, and the second through hole 132 is connected, so that the water in the accommodating chamber 13 can flow into the second flow channel 12 through the second through hole 132, and the first flow channel 11 is blocked. In the second blocking state, the blocking member 40 blocks the second through hole 132, and the first through hole 131 is connected, so that the water in the accommodating chamber 13 can flow into the first flow channel 11 through the first through hole 131, and the second flow channel 12 is blocked.

[0077] By switching between the first blocking state and the second blocking state of the blocking member 40, the blocking member 40 mechanically blocks the first through hole 131 or the second through hole 132, which is conducive to selectively realizing the separate water flow of the two flow channels, and then realizing the rotation of the spray arm 10 around the rotation axis F1 when the two flow channels are separately flowing with water, which is conducive to realizing the two rotation states of the spray arm 10. For example, in some embodiments, Figure 1As shown, when only the first flow channel 11 is filled with water, the spray arm 10 rotates clockwise, and when only the second flow channel 12 is filled with water, the spray arm 10 rotates counterclockwise, enabling the spray arm 10 to spray water onto the outside from different angles to wash tableware, reducing the dead corners of washing and improving the washing effect. The blocking member 40 is switched between the first blocking state and the second blocking state to reverse the water flow direction in the spray arm 10 to the first flow channel 11 or the second flow channel 12, and to switch the angle of the spray arm 10 for washing tableware to wash the tableware in different directions, thereby improving the washing effect on the tableware.

[0078] By moving the moving member 30 up and down relative to the fixed member 20, the relative height position of adjacent guiding surfaces can be changed. Considering that the starting end height of each guiding surface is higher than the ending end height to guide the blocking member 40 on the guiding surface, the blocking member 40 can move along the first guiding surface 211, the third guiding surface 311, the second guiding surface 221, and the fourth guiding surface 321 under the action of its own gravity and the guiding action of the guiding surface. The blocking member 40 has a first blocking state and a second blocking state, which can make the water flow only to the second flow channel 12 and not to the first flow channel 11, or make the water flow only to the first flow channel 11 and not to the second flow channel 12, realizing the alternative flow of the water flow in the spray arm 10 to the two flow channels. Therefore, by controlling the up and down movement of the moving member 30 relative to the fixed member 20, the blocking state of the blocking member 40 can be switched, without the need to add other components to control the blocking member 40 from blocking the first through hole 131 or the second through hole 132, which is beneficial to simplifying the reversing structure of the spray arm assembly 100 for controlling the water flow to the first flow channel 11 or the second flow channel 12, and is easy to realize the reversing of the water flow between the first flow channel 11 and the second flow channel 12.

[0079] In some related technologies, the blocking of different through holes is achieved by the surface contact between the valve plate of the water distribution valve and the plane where the through hole is located. However, the water flow is likely to flow into the blocked through hole from the gap between the valve plate of the water distribution valve and the plane where the through hole is located, causing the flow channel connected to the blocked through hole to also be filled with water, resulting in poor sealing. It is difficult for the water flow to alternatively flow into one of the multiple flow channels, which is likely to reduce the user experience. In this application, the first through hole 131 or the second through hole 132 is mechanically blocked by the blocking member 40. The blocking member 40 is in line contact or surface contact with the through hole. The blocking member 40 is pressed and blocked by the through hole under the action of the water pressure, and the blocking member 40 is not easily displaced relative to the blocked through hole, improving the sealing of the blocked through hole. The water flow is not easily introduced into the corresponding flow channel from the blocked through hole, with good sealing, which is beneficial to alternatively achieving the separate water filling of the two flow channels of the spray arm 10, making the separate water filling of the two flow channels of the spray arm 10 have a better washing effect on the tableware, and is beneficial to improving the user experience.

[0080] According to the spray arm assembly 100 of the embodiment of the present utility model, by the up-and-down movement of the moving member 30 relative to the fixed member 20 and in combination with the guiding effect of the four guiding surfaces on the blocking member 40, the movement of the blocking member 40 along the first guiding surface 211, the third guiding surface 311, the second guiding surface 221 and the fourth guiding surface 321 can be realized, so that the blocking member 40 can be switched between the first blocking state and the second blocking state, which is beneficial to simplifying the commutation structure of the spray arm assembly 100 for controlling the water flow to the first flow channel 11 or the second flow channel 12 and is easy to implement.

[0081] Since the spray arm assembly 100 according to the embodiment of the present utility model has the above beneficial technical effects, in the dishwasher according to the embodiment of the present utility model, by the up-and-down movement of the moving member 30 relative to the fixed member 20 and in combination with the guiding effect of the four guiding surfaces on the blocking member 40, the movement of the blocking member 40 along the first guiding surface 211, the third guiding surface 311, the second guiding surface 221 and the fourth guiding surface 321 can be realized, so that the blocking member 40 can be switched between the first blocking state and the second blocking state, which is beneficial to simplifying the commutation structure of the spray arm assembly 100 for controlling the water flow to the first flow channel 11 or the second flow channel 12 and is easy to implement.

[0082] In some embodiments, as Figures 1 - 2 shown, the dishwasher includes a washing pump and a connecting pipe assembly 200. The connecting pipe assembly 200 connects the washing pump and the spray arm assembly 100, enabling the washing pump to introduce water flow from top to bottom into the accommodation cavity 13 of the spray arm assembly 100 through the connecting pipe assembly 200, rather than directly connecting the washing pump and the spray arm assembly 100 together, making the relative installation positions of the washing pump and the spray arm assembly 100 relatively flexible.

[0083] The relative positions of the four guiding surfaces and the two through holes are set relatively flexibly. For example, in some embodiments of the present utility model, in the direction perpendicular to the rotation axis F1 of the spray arm 10, the first through hole 131 is located on the side of the first guiding surface 211 away from the rotation axis F1 of the spray arm 10, and the second through hole 132 is located on the side of the second guiding surface 221 away from the rotation axis F1 of the spray arm 10, so that the water in the accommodation cavity 13 in the first blocking state can flow from the space on the second guiding surface 221 to the second through hole 132 and then into the second flow channel 12, and the water in the accommodation cavity 13 in the second blocking state can flow from the space on the first guiding surface 211 to the first through hole 131 and then into the first flow channel 11. For example, when the moving member 30 moves up and down relative to the fixed member 20 and the blocking member 40 moves to the first guiding surface 211, the first through hole 131 can be blocked in the direction away from the rotation axis F1, and when the blocking member 40 moves to the second guiding surface 221, the second through hole 132 can be blocked in the direction away from the rotation axis F1.

[0084] In other embodiments, as Figures 3 - 9As shown, in the direction perpendicular to the rotation axis F1 of the spray arm 10, the first through hole 131 is located on the side of the third guiding surface 311 away from the rotation axis F1 of the spray arm 10, and the second through hole 132 is located on the side of the fourth guiding surface 321 away from the rotation axis F1 of the spray arm 10, so that the water in the accommodating cavity 13 in the first plugging state can flow from the space on the fourth guiding surface 321 to the second through hole 132 and then flow into the second flow channel 12, and the water in the accommodating cavity 13 in the second plugging state can flow from the space on the third guiding surface 311 to the first through hole 131 and then flow into the first flow channel 11. For example, when the moving member 30 moves up and down relative to the fixed member 20, when the plugging member 40 moves to the third guiding surface 311, the first through hole 131 can be plugged in the direction away from the rotation axis F1, and when the plugging member 40 moves to the fourth guiding surface 321, the second through hole 132 can be plugged in the direction away from the rotation axis F1.

[0085] For the convenience of understanding, the following description is given taking this embodiment as an example, that is, in the direction perpendicular to the rotation axis F1 of the spray arm 10, the first through hole 131 is located on the side of the third guiding surface 311 away from the rotation axis F1 of the spray arm 10, and the second through hole 132 is located on the side of the fourth guiding surface 321 away from the rotation axis F1 of the spray arm 10.

[0086] In some embodiments of the present utility model, as Figures 10 - 13 shown, the moving member 30 can reciprocate between a first position and a second position, and the first position is higher than the second position. In the first plugging state and the second plugging state, the moving member 30 is in the second position.

[0087] Among them, in the first position, the end of the third guiding surface 311 is not lower than the starting end of the second guiding surface 221, the end of the fourth guiding surface 321 is not lower than the starting end of the first guiding surface 211, the end of the first guiding surface 211 is lower than the starting end of the third guiding surface 311, and the end of the second guiding surface 221 is lower than the starting end of the fourth guiding surface 321. In the second position, the end of the first guiding surface 211 is not lower than the starting end of the third guiding surface 311, the end of the second guiding surface 221 is not lower than the starting end of the fourth guiding surface 321, the end of the third guiding surface 311 is lower than the starting end of the second guiding surface 221, and the end of the fourth guiding surface 321 is lower than the starting end of the first guiding surface 211.

[0088] As Figure 10 and Figure 12As shown, at the first position, the end of the fourth guiding surface 321 is not lower than the starting end of the first guiding surface 211. For example, the end of the fourth guiding surface 321 is equal to or slightly higher than the starting end of the first guiding surface 211, enabling the plugging member 40 located on the fourth guiding surface 321 to move to the first guiding surface 211 under the guiding action of the height difference between the end of the fourth guiding surface 321 and the starting end of the first guiding surface 211, and the gravity of the plugging member 40 itself. As Figure 10 shown, the transfer of the plugging member 40 from the fourth guiding surface 321 to the first guiding surface 211 is realized. And the end of the first guiding surface 211 is lower than the starting end of the third guiding surface 311, enabling the plugging member 40 located at the end of the first guiding surface 211 to stay at the end of the first guiding surface 211 under the limiting action of the height difference between the end of the first guiding surface 211 and the starting end of the third guiding surface 311. As Figure 10 shown, the stay of the plugging member 40 on the first guiding surface 211 is realized.

[0089] The end of the third guiding surface 311 is not lower than the starting end of the second guiding surface 221. For example, the end of the third guiding surface 311 is equal to or slightly higher than the starting end of the second guiding surface 221, enabling the plugging member 40 located on the third guiding surface 311 to move to the second guiding surface 221 under the guiding action of the height difference between the end of the third guiding surface 311 and the starting end of the second guiding surface 221, and the gravity of the plugging member 40 itself. As Figure 12 shown, the transfer of the plugging member 40 from the third guiding surface 311 to the second guiding surface 221 is realized. And the end of the second guiding surface 221 is lower than the starting end of the fourth guiding surface 321, enabling the plugging member 40 located at the end of the second guiding surface 221 to stay at the end of the second guiding surface 221 under the limiting action of the height difference between the end of the second guiding surface 221 and the starting end of the fourth guiding surface 321. As Figure 12 shown, the stay of the plugging member 40 on the second guiding surface 221 is realized.

[0090] As Figure 11 and Figure 13 shown, at the second position, the end of the first guiding surface 211 is not lower than the starting end of the third guiding surface 311. For example, the end of the first guiding surface 211 is equal to or slightly higher than the starting end of the third guiding surface 311, enabling the plugging member 40 located on the first guiding surface 211 to move to the third guiding surface 311 under the guiding action of the height difference between the end of the first guiding surface 211 and the starting end of the third guiding surface 311, and the gravity of the plugging member 40 itself. As Figure 11 shown, the transfer of the plugging member 40 from the first guiding surface 211 to the third guiding surface 311 is realized. And the end of the third guiding surface 311 is lower than the starting end of the second guiding surface 221, enabling the plugging member 40 located at the end of the third guiding surface 311 to stay at the end of the third guiding surface 311 under the limiting action of the height difference between the end of the third guiding surface 311 and the starting end of the second guiding surface 221.Figure 11 As shown, the plugging member 40 is stopped on the third guiding surface 311. At this time, the third guiding surface 311 is opposite to the first through hole 131 perpendicular to the rotation axis F1 of the spray arm 10, which is conducive to enabling the plugging member 40 to plug the first through hole 131 to be in the first plugging state.

[0091] The end of the second guiding surface 221 is not lower than the starting end of the fourth guiding surface 321. For example, the end of the second guiding surface 221 is equal to or slightly higher than the starting end of the fourth guiding surface 321, so that the plugging member 40 located on the second guiding surface 221 can move to the fourth guiding surface 321 under the guiding action of the height difference between the end of the second guiding surface 221 and the starting end of the fourth guiding surface 321 and the action of the self-gravity of the plugging member 40, as Figure 13 As shown, the transfer of the plugging member 40 from the second guiding surface 221 to the fourth guiding surface 321 is realized. And the end of the fourth guiding surface 321 is lower than the starting end of the first guiding surface 211, so that the plugging member 40 located at the end of the fourth guiding surface 321 stays at the end of the fourth guiding surface 321 under the limiting action of the height difference between the end of the fourth guiding surface 321 and the starting end of the first guiding surface 211, as Figure 13 As shown, the plugging member 40 is stopped on the fourth guiding surface 321. At this time, the fourth guiding surface 321 is opposite to the second through hole 132 perpendicular to the rotation axis F1 of the spray arm 10, which is conducive to enabling the plugging member 40 to plug the second through hole 132 to be in the second plugging state.

[0092] Therefore, by the reciprocating movement of the moving member 30 between the first position and the second position, the movement of the plugging member 40 along the first guiding surface 211, the third guiding surface 311, the second guiding surface 221 and the fourth guiding surface 321 and the stop on the four guiding surfaces can be realized, which is convenient for switching the plugging state of the plugging member 40, simplifies the commutation mechanism for controlling the water flow to the first flow channel 11 or the second flow channel 12 in the spray arm assembly 100, and has strong practicability.

[0093] In the fixing member 20, the height of the first guiding surface 211 can be higher than, equal to or lower than the height of the second guiding surface 221. In the moving member 30, the height of the third guiding surface 311 can be higher than, equal to or lower than the height of the fourth guiding surface 321, and the height design of the guiding surface is relatively flexible. For example, in some specific embodiments, as Figures 10 - 13 As shown, in the fixing member 20, the starting end height of the first guiding surface 211 is equal to the starting end height of the second guiding surface 221, and the end height of the first guiding surface 211 is equal to the end height of the second guiding surface 221; in the moving member 30, the starting end height of the third guiding surface 311 is equal to the starting end height of the fourth guiding surface 321, and the end height of the third guiding surface 311 is equal to the end height of the fourth guiding surface 321.

[0094] In some embodiments, as Figures 4 - 6 、Figures 8 - 9 and Figures 14 - 15 As shown in Figures 14 - 15 , the spray arm assembly 100 further includes a reset member 50. The reset member 50 is connected to the moving member 30, and the reset member 50 applies an upward driving force to the moving member 30. The moving member 30 is configured to move from the first position to the second position under the action of water pressure; in the state where water supply is stopped, the moving member 30 moves from the second position to the first position under the drive of the reset member 50.

[0095] In the state where water is supplied to the spray arm assembly 100, water is introduced into the accommodation cavity 13 to apply a downward driving force to the moving member 30 through the water pressure of the water flow, so that the moving member 30 moves downward from the first position to the second position against the upward driving force from the reset member 50. In the state where water supply to the spray arm assembly 100 is stopped, the moving member 30 moves upward from the second position to the first position under the drive of the reset member 50.

[0096] Through the reset member 50 and the water supply state of the spray arm assembly 100, the reciprocating switching of the moving member 30 between the first position and the second position can be realized. During the switching process, no manual operation is required except for controlling the water supply state of the spray arm assembly 100, which reduces the required operation steps and is beneficial to improving the user experience.

[0097] The reset member 50 can be an elastic component, etc. For example, the reset member 50 is a spring made of stainless steel, which is convenient for long-term contact with water flow and is not easy to rust, and has a long service life. In some embodiments, as Figure 5 and Figure 9 shown, the reset member 50 is a spring and is always in a compressed state. The lower end of the spring is fixedly arranged on the bottom wall of the accommodation cavity 13 and the upper end is connected to the bottom of the moving member 30, so that the spring can always apply an upward driving force to the moving member 30. A guide post 51 extending in the up and down direction is arranged inside the spring. The guide post 51 can guide the expansion and contraction of the spring, reduce the offset of the spring relative to the up and down direction, and enable the spring to expand and contract in the up and down direction to apply an upward driving force to the moving member 30.

[0098] In some embodiments of the present utility model, as Figures 10 - 19 shown, the fixing member 20 includes a first boss 21, a second boss 22 and a water guiding portion 23. The water guiding portion 23 has a water guiding channel 231. Both the first boss 21 and the second boss 22 are connected to the lower end of the water guiding portion 23. The upper surface of the first boss 21 is a first guiding surface 211, and the upper surface of the second boss 22 is a second guiding surface 221. Two first water passing openings are formed between the first boss 21 and the second boss 22 in the circumferential direction of the water guiding portion 23. The moving member 30 includes a third boss 31, a fourth boss 32 and a water blocking portion 33. Both the third boss 31 and the fourth boss 32 are connected to the upper end of the water blocking portion 33. The upper surface of the third boss 31 is a third guiding surface 311, and the upper surface of the fourth boss 32 is a fourth guiding surface 321.

[0099] The water blocking part 33 is movably located below the water guiding part 23. The moving part 30 is reciprocally movable between a first position and a second position, and the first position is higher than the second position. At the first position, the third boss 31 and the fourth boss 32 respectively block the two first water passing openings. At the second position, the third boss 31 and the fourth boss 32 at least partially open the corresponding first water passing openings, so that the first water passing openings communicate with the space above the third guiding surface 311 or the fourth guiding surface 321 and the water guiding channel 231.

[0100] By the reciprocating movement of the moving part 30 between the first position and the second position, the height positions of the third boss 31 and the fourth boss 32 relative to the first boss 21 and the second boss 22 can be changed, so as to block or open the corresponding first water passing openings together by the third boss 31 and the fourth boss 32, and to control the communication between the through hole and the water guiding channel 231.

[0101] For example, when the moving part 30 moves from the first position to the second position, the two first water passing openings are respectively opened by the third boss 31 and the fourth boss 32, so that the water flow in the water guiding channel 231 flows through the first water passing openings to the space above the third guiding surface 311 or the fourth guiding surface 321, and the spaces above the third guiding surface 311 and the fourth guiding surface 321 are respectively communicated with the first through hole 131 and the second through hole 132, so that the water flow can flow to the first through hole 131 or the second through hole 132 to flow into the corresponding flow channels. Combining with the movement of the blocking part 40 on the four bosses, when the blocking part 40 is in the first blocking state, the water flow flowing to the first through hole 131 is blocked by the blocking part 40, so that the water flow flowing out from the water guiding channel 231 through the first water passing openings can only flow from the second through hole 132 to the second flow channel 12; when the blocking part 40 is in the second blocking state, the water flow flowing to the second through hole 132 is blocked by the blocking part 40, so that the water flow flowing out from the water guiding channel 231 through the first water passing openings can only flow from the first through hole 131 to the first flow channel 11, so as to realize the separate flow of the first flow channel 11 and the second flow channel 12.

[0102] For example, when the moving part 30 moves from the second position to the first position, the two first water passing openings are blocked by the third boss 31 and the fourth boss 32, so that both the first through hole 131 and the second through hole 132 are not communicated with the water guiding channel 231, so as to prevent the water flow from flowing to the first flow channel 11 and the second flow channel 12. At this time, the spray arm assembly 100 is in a closed state of stopping water supply, so that the two flow channels of the spray arm assembly 100 are not easy to leak water in the closed state.

[0103] By reciprocating the moving member 30 between the first position and the second position to block or open the corresponding first water passing opening by using the third boss 31 and the fourth boss 32, the spray arm assembly 100 is in a closed state or a starting state, and in combination with the movement of the blocking member 40 on the four bosses, the water passing states of the two flow channels of the spray arm assembly 100 in the starting state are switched, which has strong practicability.

[0104] In some embodiments, as Figures 10 - 19 shown, a guiding groove 232 axially opposite to the first water passing opening is provided on the outer peripheral surface of the water guiding portion 23, and the guiding groove 232 extends in the up and down direction. The upper ends of the third boss 31 and the fourth boss 32 are respectively provided with guiding portions 34, the guiding portions 34 are movably embedded in the guiding groove 232, and the guiding portions 34 are provided with second water passing openings 341. In the second position, the second water passing opening 341 communicates the upper space of the third guiding surface 311 or the fourth guiding surface 321 and the first water passing opening.

[0105] By limiting the guiding portion 34 by the guiding groove 232, when the moving member 30 moves up and down relative to the fixed member 20, the moving member 30 is not likely to have relative displacement or even separation from the fixed member 20 in other directions except the up and down direction, which is beneficial to improving the reliability of the up and down movement of the moving member 30 relative to the fixed member 20, and further facilitating the more smooth movement of the blocking member 40 on the four guiding surfaces.

[0106] And through the second water passing opening 341 on the guiding portion 34, the water flow in the water guiding channel 231 can flow through the first water passing opening and then through the second water passing opening 341 to the upper space of the third guiding surface 311 or the fourth guiding surface 321, making the flow of the water flow from the water guiding channel 231 to the upper space of the third guiding surface 311 or the fourth guiding surface 321 smoother.

[0107] The number of the second water passing openings 341 on each water guiding portion 23 can be one, two or more. For example, two second water passing openings 341 are provided on one water guiding portion 23, which is beneficial to improving the strength of the water guiding portion 23 while communicating the upper space of the third guiding surface 311 or the fourth guiding surface 321 and the first water passing opening, so that the water guiding portion 23 of the moving member 30 is not likely to be damaged such as broken during the assembly, transportation or working process of the spray arm assembly 100, which is beneficial to improving the service life of the spray arm assembly 100.

[0108] In some embodiments, as Figure 13As shown, for the second water passing port 341 on the circumferential direction of each water guiding part 23 that is close to the starting end of the third guiding surface 311 or the fourth guiding surface 321, one end of the second water passing port 341 close to the starting end of the third guiding surface 311 or the fourth guiding surface 321 is closer to the starting end of the third guiding surface 311 or the fourth guiding surface 321 than the plugging member 40 when it is located at the end of the third guiding surface 311 or the fourth guiding surface 321, and the through hole is closer to the end of the third guiding surface 311 or the fourth guiding surface 321 than the starting end of the third guiding surface 311 or the fourth guiding surface 321 in the circumferential direction of the water guiding part 23, so that the water flow flowing through the second water passing port 341 to the upper space of the third guiding surface 311 or the fourth guiding surface 321 can impact the plugging member 40 in a diagonally downward direction, which is more conducive to the plugging member 40 moving radially outward along the water guiding part 23 and close to the end of the guiding surface to plug the first through hole 131 or the second through hole 132, improving the reliability of the plugging member 40 in plugging the through hole.

[0109] In some embodiments, as Figure 5 and Figure 9 shown, in the first position, the water blocking part 33 abuts against the lower end surface of the water guiding part 23. The bottom wall of the accommodating cavity 13 is provided with a limiting convex part 133. In the second position, the water blocking part 33 abuts against the limiting convex part 133. The water guiding part 23 and the limiting convex part 133 can limit the movement of the water baffle in the up and down directions, so that when the moving part 30 moves up and down relative to the fixed part 20, it moves up to the first position at most and moves down to the second position at least, which is conducive to improving the reliability of the reciprocating movement of the moving part 30 between the first position and the second position. Among them, the limiting convex part 133 can be an annular structure, a columnar structure or an irregular structure, etc.

[0110] In some embodiments of the present utility model, as Figures 4 - 5 and Figure 15 shown, the bottom wall of the accommodating cavity 13 is provided with a drain hole 134. Through the drain hole 134, the accumulated water in the accommodating cavity 13 can be discharged, which is conducive to keeping the spray arm assembly 100 clean in the closed state. In some embodiments, the bottom walls of the first flow channel 11 and the second flow channel 12 are provided with drain holes 134 to discharge the accumulated water in the flow channels, making the spray arm assembly 100 cleaner in the closed state.

[0111] In some embodiments, as Figures 4 - 6 and Figures 8 - 9 shown, the bottom wall of the accommodating cavity 13 is provided with a convex part 135. The convex part 135 divides the accommodating cavity 13 into a plurality of sub-cavities 136, and the bottom wall of each sub-cavity 136 is provided with a drain hole 134. Through the plurality of sub-cavities 136 and the drain holes 134 in each sub-cavity 136, the accumulated water in the accommodating cavity 13 can be distributed in the plurality of sub-cavities 136 and discharged simultaneously through the drain holes 134 in each sub-cavity 136, which is conducive to improving the drainage speed of the accommodating cavity 13.

[0112] In some embodiments, as Figure 5 and Figure 9 shown, the convex portion 135 divides the receiving cavity 13 into two inner and outer sub-cavities 136. A drain hole 134 is provided in the bottom wall of the inner sub-cavity 136, and two drain holes 134 are provided in the bottom wall of the outer sub-cavity 136, which is conducive to improving the drainage speed of the two inner and outer sub-cavities 136. Moreover, a reset member 50 is provided in the inner sub-cavity 136, which can reduce the adverse impact of the water flow impact in the receiving cavity 13 on the reset member 50 and is conducive to protecting the reset member 50.

[0113] In some embodiments, as Figure 5 and Figure 9 shown, the convex portion 135 can not only divide the receiving cavity 13 into two inner and outer sub-cavities 136, but also serve as a limiting convex portion 133 to limit the movement of the moving member 30, with diverse functions and conducive to simplifying the structure of the spray arm 10.

[0114] In some embodiments where a drain hole 134 is provided in the bottom wall of the receiving cavity 13, as Figure 12 and Figures 18 - 19 shown, a drainage cavity 35 is formed inside the third boss 31 or the fourth boss 32. The drainage cavity 35 has a bottom opening communicating with the receiving cavity 13. The third boss 31 has a first side wall 312 connected to the starting end of the third guiding surface 311, and the fourth boss 32 has a second side wall 322 connected to the starting end of the fourth guiding surface 321. A first drain port 36 communicating with the drainage cavity 35 is provided on the first side wall 312 or the second side wall 322. The accumulated water on the guiding surface can flow downward along the guiding surface to the first drain port 36 and then flow into the drainage cavity 35. Further, the accumulated water is discharged into the receiving cavity 13 through the bottom opening of the drainage cavity 35, and finally discharged through the drain hole 134 in the bottom wall of the receiving cavity 13, which is conducive to accelerating the discharge of the accumulated water on the guiding surface.

[0115] In some embodiments, as Figure 12 and Figure 19 shown, both the third boss 31 and the fourth boss 32 have a drainage cavity 35 inside, and both the first side wall 312 and the second side wall 322 are provided with a first drain port 36 communicating with the drainage cavity 35, so that the drainage speed of the accumulated water on the four guiding surfaces is faster.

[0116] In some embodiments, as Figures 18 - 19 shown, both the first side wall 312 and the second side wall 322 are provided with a second drain port 37 communicating with the bottom opening, so as to increase the communication area between the drainage cavity 35 and the receiving cavity 13, which can accelerate the speed of the accumulated water in the drainage cavity 35 being discharged into the receiving cavity 13 and is conducive to improving the drainage speed.

[0117] In some embodiments, as Figure 6 and Figures 10 - 19As shown, the third boss 31 or the fourth boss 32 has a drainage cavity 35. The drainage cavity 35 has a bottom opening communicating with the accommodation cavity 13. The third boss 31 has a first inner peripheral wall 313 connected to one end of the third guiding surface 311 close to the water blocking part 33, and the fourth boss 32 has a second inner peripheral wall 323 connected to one end of the fourth guiding surface 321 close to the water blocking part 33. A communication port 38 communicating with the drainage cavity 35 is provided on the first inner peripheral wall 313 or the second inner peripheral wall 323. The lower end surface of the water guiding part 23 is provided with a recess 233 communicating with the first water passing opening. In the first position, the water blocking part 33 abuts against the lower end surface of the water guiding part 23, and the water blocking part 33 is spaced apart from the bottom surface of the recess 233. The recess 233 communicates the communication port 38 and the water guiding channel 231.

[0118] When the moving part 30 is in the first position, the accumulated water in the water guiding channel 231 can flow through the recess 233 of the water guiding part 23 to the communication port 38 and then to the drainage cavity 35, and then the accumulated water is discharged into the accommodation cavity 13 through the bottom opening of the drainage cavity 35, and finally the accumulated water is discharged through the drainage hole 134 on the bottom wall of the accommodation cavity 13, which is beneficial to accelerating the discharge of the accumulated water in the water guiding channel 231.

[0119] In some embodiments, both the third boss 31 and the fourth boss 32 have a drainage cavity 35, and communication ports 38 communicating with the drainage cavity 35 are provided on both the first inner peripheral wall 313 and the second inner peripheral wall 323, so that the drainage speed of the accumulated water in the water guiding channel 231 is faster.

[0120] In some embodiments, such as Figure 5 、 Figures 10 - 15 and Figures 18 - 19 As shown, the third boss 31 or the fourth boss 32 has a drainage cavity 35. The drainage cavity 35 has a bottom opening communicating with the accommodation cavity 13. The third boss 31 has a first outer peripheral wall 314 connected to one end of the third guiding surface 311 away from the water blocking part 33, and the fourth boss 32 has a second outer peripheral wall 324 connected to one end of the fourth guiding surface 321 away from the water blocking part 33. An avoidance opening 39 is provided on the first outer peripheral wall 314 or the second outer peripheral wall 324. In the first position, the first through hole 131 or the second through hole 132 is radially opposite to and communicates with the avoidance opening 39.

[0121] The avoidance opening 39 can be a thinning groove provided on the outer wall surface of the first outer peripheral wall 314 or the second outer peripheral wall 324 to increase the distance between the first through hole 131 or the second through hole 132 and the corresponding third boss 31 or fourth boss 32 along the radial direction of the water guiding part 23. When the moving part 30 is in the first position, the accumulated water in the flow channel can flow to the accommodation cavity 13 faster through the gap between the through hole and the boss, and finally the accumulated water is discharged through the drainage hole 134 on the bottom wall of the accommodation cavity 13, which is beneficial to accelerating the discharge of the accumulated water in the flow channel.

[0122] The avoidance opening 39 can also be a through-opening penetrating the first outer peripheral wall 314 or the second outer peripheral wall 324. When the moving member 30 is in the first position, the accumulated water in the flow channel can flow directly into the accommodating cavity 13 through the gap between the through-hole and the boss, or can flow through the gap between the through-hole and the boss to the avoidance opening 39 and then flow into the drainage cavity 35, and then the accumulated water is discharged into the accommodating cavity 13 through the bottom opening of the drainage cavity 35, and finally the accumulated water is discharged through the drainage hole 134 at the bottom wall of the accommodating cavity 13, increasing the discharge path of the accumulated water and facilitating the acceleration of the discharge of the accumulated water in the flow channel.

[0123] In some embodiments, such as Figure 5 and Figures 18 - 19 shown, the avoidance opening 39 is a through-opening and is communicated with the bottom opening of the drainage cavity 35, so that the accumulated water flowing to the avoidance opening 39 can flow directly into the accommodating cavity 13 through the bottom opening, or can be discharged into the drainage cavity 35 and then into the accommodating cavity 13, and the drainage speed is faster.

[0124] In some embodiments, such as Figure 5 and Figures 18 - 19 shown, the third boss 31 and the fourth boss 32 both have a drainage cavity 35, and the first outer peripheral wall 314 and the second outer peripheral wall 324 are both provided with avoidance openings 39. In the first position, the first through-hole 131 and the second through-hole 132 are respectively radially opposite and communicated with the corresponding avoidance openings 39, and the drainage speed of the accumulated water in the flow channel is faster.

[0125] In some embodiments, such as Figure 4 and Figures 14 - 17 shown, the first boss 21 and the second boss 22 both have an inner cavity 25, which is beneficial to reducing the weight of the fixing member 20. The first boss 21 has a third side wall 212 connected to the end of the first guiding surface 211, and the second boss 22 has a fourth side wall 222 connected to the end of the fourth guiding surface 321. The third side wall 212 and the fourth side wall 222 are both provided with third drainage openings 213 communicated with the inner cavity 25. The accumulated water that may enter the inner cavity 25 from the connection gap between the first boss 21 and the bottom wall of the accommodating cavity 13 and the connection gap between the second boss 22 and the bottom wall of the accommodating cavity 13 in the accommodating cavity 13 can be discharged into the accommodating cavity 13 from the third drainage openings 213, which is beneficial to discharging the accumulated water that may exist in the inner cavity 25.

[0126] In some embodiments, such as Figure 4 shown, the third drainage openings 213 are connected to the drainage holes 134 in the vertical direction, so that the accumulated water in the inner cavity 25 can be directly discharged through the drainage holes 134, and the drainage speed is faster.

[0127] In some embodiments of the present invention, such as Figures 1 - 2 and Figures 14 - 15As shown, the spray arm 10 includes a connecting portion 14 and two arm portions 15. The two arm portions 15 are respectively located on both sides of the connecting portion 14 along the first horizontal direction, and the spray arm 10 is rotatable about the center line of the connecting portion 14. The first flow channel 11 communicates with the outside through a plurality of first spray holes 111, and the second flow channel 12 communicates with the outside through a plurality of second spray holes 121. The opening directions of the plurality of first spray holes 111 along the circumferential direction of the spray arm 10 are the same, and the opening directions of the plurality of second spray holes 121 along the circumferential direction of the spray arm 10 are the same. The opening directions of the first spray holes 111 and the second spray holes 121 located on the same arm portion 15 are opposite along the circumferential direction of the spray arm 10.

[0128] It can be understood that the center line of the connecting portion 14 is the rotation axis F1 of the spray arm 10, and the opening direction of the spray hole along the circumferential direction of the spray arm 10 is the opening direction of the spray hole around the rotation axis F1. The first horizontal direction can be Figure 1 the left-right direction shown, or a direction forming a certain angle with the left-right direction, etc. The pointing of the first horizontal direction in the three-dimensional space is not fixed. For example, Figure 1 as shown, the pointing of the first horizontal direction will change with the rotation of the spray arm 10.

[0129] The water flow flowing into the first flow channel 11 sprays to the outside through the opening of the first spray hole 111 and along the opening direction of the first spray hole 111 to wash the tableware. At the same time, the spray arm 10 is subjected to the reaction force of the water flow ejected from the first spray hole 111 and moves in the direction opposite to the opening direction of the first spray hole 111. And the opening directions of the plurality of first spray holes 111 along the circumferential direction of the spray arm 10 are the same, so that the spray arm 10 is subjected to the reaction forces of the water flows ejected from the plurality of first spray holes 111 and rotates around the rotation axis. The rotation direction of the spray arm 10 is opposite to the opening direction of the first spray hole 111 along the circumferential direction of the spray arm 10.

[0130] For example, in some embodiments, as Figure 1 shown, the plurality of first spray holes 111 are arranged in the left-right direction on the two arm portions 15 of the spray arm 10, and the plurality of first spray holes 111 open counterclockwise along the circumferential direction of the spray arm 10. Specifically, Figure 1 in the front-rear direction in the state shown, the first spray holes 111 on the left arm portion 15 open forward, and the first spray holes 111 on the right arm portion 15 open backward. The plurality of first spray holes 11 on the two arm portions 15 spray water to the outside at the same time, causing the spray arm 10 to rotate clockwise around the rotation axis

[0131] The spray arm 10 rotates while spraying water through the first spray holes 111 to wash the tableware, which is beneficial to spraying water from different angles by each first spray hole 111 during the washing process to wash more positions of the tableware, can reduce the washing dead angle, and improve the washing effect on the tableware. The action of the water flow flowing into the second flow channel 12 is similar to the above process and will not be elaborated here.

[0132] The openings of the first spray hole 111 and the second spray hole 121 located on the same arm 15 are opposite in the circumferential direction of the spray arm 10, so that the rotation directions of the spray arm 10 are opposite when the first flow channel 11 and the second flow channel 12 are filled with water separately, enabling the spray arm 10 to achieve two rotational states with opposite rotation directions, which is beneficial for the spray arm 10 to spray water to the outside from more different angles to wash tableware all-round, further reducing the washing dead angle and improving the washing effect on tableware.

[0133] The first flow channel 11 and the second flow channel 12 can be arranged side by side, crosswise, etc., such as arranged side by side in the horizontal direction, crosswise in a straight line, crosswise in a curve, etc. For example, in some embodiments, such as Figures 1 - 3 and Figure 7 shown, the first flow channel 11 and the second flow channel 12 are arranged at intervals in the second horizontal direction, the second horizontal direction is perpendicular to the first horizontal direction, and the plurality of first spray holes 111 and the plurality of second spray holes 121 are respectively distributed on both sides of the rotation axis F1 of the spray arm 10. The first spray hole 111 and the second spray hole 121 located on the same arm 15 are arranged in the second horizontal direction to be respectively distributed on both sides of the rotation axis F1 of the spray arm 10, which is beneficial for simplifying the arrangement structures of the first flow channel 11 and the second flow channel 12 and the corresponding first spray holes 111 and second spray holes 121, easy to manufacture, and beneficial for increasing the driving force for driving the spray arm 10 to rotate in the circumferential direction of the spray arm 10 when the first spray hole 111 and the second spray hole 121 spray water respectively, making the spray arm 10 easier to rotate.

[0134] The second horizontal direction can be the front-back direction as shown in Figure 1 or a direction at a certain angle with the front-back direction, etc. The pointing of the second horizontal direction in the three-dimensional space is not fixed. For example, Figure 1 shown, the pointing of the second horizontal direction will change with the rotation of the spray arm 10. The first flow channel 11 and the second flow channel 12 in the spray arm 10 can be separated by a partition plate 16.

[0135] In some specific embodiments, such as Figure 1 and Figure 3 shown, the first flow channel 11 and the second flow channel 12 are arranged at intervals in the front-back direction. The first spray holes 111 and the second spray holes 121 on the left arm 15 are arranged in the front-back direction, and the first spray hole 111 is located behind the second spray hole 121; the first spray holes 111 and the second spray holes 121 on the right arm 15 are arranged in the front-back direction, and the first spray hole 111 is located behind the second spray hole 121.

[0136] The installation position of the spray arm assembly 100 in the dishwasher is relatively flexible. For example, in some embodiments, the spray arm assembly 100 is a top spray, that is, the spray arm assembly 100 is arranged at the upper part of the dishwasher to achieve top spraying, and the first spray holes 111 and the second spray holes 121 are arranged on the lower surface of the spray arm 10 to spray water downward. For example, in some embodiments, the spray arm assembly 100 is arranged in the middle of the dishwasher to achieve middle spraying, and the first spray holes 111 and the second spray holes 121 can be arranged on the upper surface, the lower surface of the spray arm 10 or on both the upper surface and the lower surface at the same time.

[0137] Next, the spray arm assembly 100 and the dishwasher according to a specific embodiment of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the following description is only an exemplary illustration and should not be construed as a limitation of the present invention.

[0138] As Figures 1 - 19 shown, a dishwasher according to a specific embodiment of the present invention includes a washing pump, a connecting pipe assembly 200 and a spray arm assembly 100. The washing pump passes water from top to bottom to the spray arm assembly 100 through the connecting pipe assembly 200.

[0139] The spray arm assembly 100 includes a spray arm 10, a fixing member 20, a moving member 30, a blocking member 40 and a reset member 50. The moving member 30 moves up and down relative to the fixing member 20 to reciprocate between a first position and a second position, realizing two rotation states of the spray arm 10 around the rotation axis. Next, a specific working process of the spray arm assembly 100 will be described.

[0140] First, as Figure 10 shown, when the washing pump is not working, the moving member 30 is located at the first position under the action of the reset member 50, and the blocking member 40 is located at the end of the first guiding surface 211 under the action of its own gravity and the guiding action of the guiding surface.

[0141] Then, as Figure 11As shown, when the washing pump is started, water flows through the connecting pipe assembly 200 into the water guiding channel 231 of the spray arm assembly 100 and exerts a downward pressure on the water blocking portion 33 of the moving member 30 on the lower side of the water guiding portion 23. When the downward pressure exerted by the water flow on the moving member 30 is greater than the upward driving force exerted by the reset member 50 on the moving member 30, the moving member 30 moves downward relative to the fixed member 20 to the second position. At this time, the height of the end of the first guiding surface 211 is equal to the starting height of the third guiding surface 311, so that the blocking member 40 moves to the end of the third guiding surface 311 under the action of its own gravity and the guiding of the guiding surface. At the same time, the water flow in the water guiding channel 231 sequentially flows through the first water passing hole and the second water passing hole 341 into the upper space of the third guiding surface 311 and the fourth guiding surface 321. Under the thrust of the water flow, the blocking member 40 on the third guiding surface 311 moves radially outward close to the first through hole 131 to block the first through hole 131. At this time, the blocking member 40 is in the first blocking state, and the water flow flows into the second flow channel 12 through the second through hole 132 and is sprayed to the outside through the second spray hole 121. Driven by the reaction force of the water flow at the second spray hole 121, the spray arm 10 rotates counterclockwise around the rotation axis.

[0142] Next, as Figure 12 shown, when the washing pump stops working, under the action of the reset member 50, the moving member 30 moves upward from the second position to the first position. At this time, the blocking member 40 on the third guiding surface 311 moves upward relative to the fixed member 20 together with the moving member 30, so that the height of the end of the third guiding surface 311 is equal to the starting height of the second guiding surface 221, and further the blocking member 40 moves to the end of the second guiding surface 221 under the action of its own gravity and the guiding of the guiding surface.

[0143] Subsequently, as Figure 13 shown, when the washing pump works again, water flows into the water guiding channel 231 and exerts a downward pressure on the moving member 30. When the downward pressure exerted by the water flow on the moving member 30 is greater than the upward driving force exerted by the reset member 50 on the moving member 30, the moving member 30 moves downward from the first position to the second position. At this time, the height of the end of the second guiding surface 221 is equal to the starting height of the fourth guiding surface 321, so that the blocking member 40 moves to the end of the fourth guiding surface 321 under the action of its own gravity and the guiding of the guiding surface. At the same time, the water flow in the water guiding channel 231 flows into the upper space of the third guiding surface 311 and the fourth guiding surface 321. Under the thrust of the water flow, the blocking member 40 on the fourth guiding surface 321 moves radially outward to block the second through hole 132. At this time, the blocking member 40 is in the second blocking state, and the water flow flows into the first flow channel 11 through the first through hole 131 and is sprayed to the outside through the first spray hole 111. Driven by the reaction force of the water flow at the first spray hole 111, the spray arm 10 rotates clockwise around the rotation axis.

[0144] Next, asFigure 10 As shown, when the washing pump stops working, the moving member 30 moves upward from the second position to the first position. At this time, the plugging member 40 on the fourth guiding surface 321 moves upward relative to the fixed member 20 together with the moving member 30, so that the height of the end of the fourth guiding surface 321 is equal to the height of the starting end of the first guiding surface 211. Furthermore, the plugging member 40 moves to the end of the first guiding surface 211 under the action of its own gravity and the guiding of the guiding surface.

[0145] In sequence and in a cycle, the moving member 30 reciprocates between the first position and the second position, so as to realize the movement of the plugging member 40 on the four guiding surfaces and the switching between the first plugging state and the second plugging state of the plugging member 40. Furthermore, the switching between the clockwise rotation and the counterclockwise rotation of the spray arm 10 around the rotation axis is realized, so that the spray arm 10 can wash the tableware from different angles, reduce the washing dead angle, and improve the washing effect on the tableware.

[0146] The spray arm assembly 100 according to the embodiment of the present invention, other components of the dishwasher, and the operations are known to those of ordinary skill in the art and will not be described in detail here.

[0147] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0148] In the description of this specification, the descriptions referring to terms such as "embodiment", "specific embodiment", "example", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0149] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and purpose of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A spray arm assembly, characterized in that: include: A spray arm, the spray arm having a first flow channel and a second flow channel for circulating liquid, the spray arm being provided with a receiving cavity, the peripheral wall of the receiving cavity being provided with a first through hole communicating with the first flow channel and a second through hole communicating with the second flow channel, the spray arm being rotatable around a rotation axis; A fixing member, wherein the fixing member is fixedly disposed in the accommodating cavity, and the top surface of the fixing member comprises a first guide surface and a second guide surface; A moving member, the moving member is movably disposed on the fixed member up and down, the top surface of the moving member comprises a third guide surface and a fourth guide surface, the first guide surface, the third guide surface, the second guide surface and the fourth guide surface are sequentially arranged around the rotation axis of the spray arm; A blocking member, wherein the blocking member is movably disposed in the accommodating cavity, and the moving member moves to change the height positions of the third guide surface and the fourth guide surface relative to the first guide surface and the second guide surface, so that the blocking member is movable along the first guide surface, the third guide surface, the second guide surface and the fourth guide surface, and in the moving direction of the blocking member, the heights of the starting ends of the first guide surface, the third guide surface, the second guide surface and the fourth guide surface are all higher than the heights of the ending ends, so that the blocking member moves from the starting end to the ending end, and the blocking member has a first blocking state and a second blocking state, wherein, In the first blocking state, the blocking member blocks the first through hole, and the second through hole is connected; in the second blocking state, the blocking member blocks the second through hole, and the first through hole is connected.

2. The spray arm assembly according to claim 1, characterized in that: In a direction perpendicular to the rotation axis of the spray arm, the first through hole is located on a side of the third guide surface away from the rotation axis of the spray arm, and the second through hole is located on a side of the fourth guide surface away from the rotation axis of the spray arm; or, in a direction perpendicular to the rotation axis of the spray arm, the first through hole is located on a side of the first guide surface away from the rotation axis of the spray arm, and the second through hole is located on a side of the second guide surface away from the rotation axis of the spray arm.

3. The spray arm assembly according to claim 1, characterized in that: The fixed part includes two guide surfaces, namely the first guide surface and the second guide surface, and the movable part includes two guide surfaces, namely the third guide surface and the fourth guide surface. The first guide surface, the third guide surface, the second guide surface, the fourth guide surface, and the first guide surface are arranged in a circle around the rotation axis of the spray arm.

4. The spray arm assembly according to claim 3, characterized in that: In the arrangement direction, the heights of the first guide surface, the second guide surface, the third guide surface and the fourth guide surface gradually decrease from the starting end to the end end.

5. The spray arm assembly according to claim 1, characterized in that: The moving member can reciprocate between a first position and a second position, the first position is higher than the second position, and the moving member is in the second position in both the first blocking state and the second blocking state, wherein: In the first position, the end of the third guide surface is not lower than the starting end of the second guide surface, the end of the fourth guide surface is not lower than the starting end of the first guide surface, the end of the first guide surface is lower than the starting end of the third guide surface, and the end of the second guide surface is lower than the starting end of the fourth guide surface; In the second position, the end of the first guide surface is not lower than the starting end of the third guide surface, the end of the second guide surface is not lower than the starting end of the fourth guide surface, the end of the third guide surface is lower than the starting end of the second guide surface, and the end of the fourth guide surface is lower than the starting end of the first guide surface.

6. The spray arm assembly according to claim 5, characterized in that: The device further comprises a reset member, wherein the reset member is connected to the moving member and applies an upward driving force to the moving member. The moving member is configured to move from the first position to the second position under the action of water pressure; When water flow is stopped, the moving member is driven by the resetting member to move from the second position to the first position.

7. The spray arm assembly according to claim 1, characterized in that: The fixing member includes a first boss, a second boss and a water guide portion, the water guide portion has a water guide channel, the first boss and the second boss are both connected to the lower end of the water guide portion, the upper surface of the first boss is the first guide surface, the upper surface of the second boss is the second guide surface, and in the circumferential direction of the water guide portion, two first water outlets are formed between the first boss and the second boss; The moving member includes a third boss, a fourth boss and a water retaining portion, the third boss and the fourth boss are both connected to the upper end of the water retaining portion, the upper surface of the third boss is the third guide surface, and the upper surface of the fourth boss is the fourth guide surface; The water retaining portion is movably located at the lower side of the water guiding portion, and the movable member can reciprocate between a first position and a second position, the first position is higher than the second position, and in the first position, the third boss and the fourth boss respectively block the two first water outlets, and in the second position, the third boss and the fourth boss at least partially open the corresponding first water outlet, so that the first water outlet is connected to the space above the third guide surface or the fourth guide surface and the water guiding channel.

8. The spray arm assembly according to claim 7, characterized in that: The outer peripheral surface of the water guide portion is provided with a guide groove axially opposite to the first water outlet, and the guide groove extends in the up-down direction; The upper ends of the third boss and the fourth boss are respectively provided with guide parts, the guide parts are movably embedded in the guide groove, and the guide parts are provided with a second water outlet. In the second position, the second water outlet connects the space above the third guide surface or the fourth guide surface and the first water outlet.

9. The spray arm assembly according to claim 7, characterized in that: In the first position, the water retaining portion abuts against the lower end surface of the water guiding portion; The bottom wall of the accommodating cavity is provided with a limiting convex portion, and in the second position, the water retaining portion abuts against the limiting convex portion.

10. The spray arm assembly according to claim 7, characterized in that: The bottom wall of the accommodating cavity is provided with a drainage hole.

11. The spray arm assembly according to claim 10, characterized in that: The bottom wall of the accommodating cavity is provided with a convex portion, and the convex portion divides the accommodating cavity into a plurality of sub-cavities, and the bottom wall of each sub-cavity is provided with the drainage hole.

12. The spray arm assembly according to claim 10, characterized in that: The third boss and / or the fourth boss have a drainage cavity therein, the drainage cavity has a bottom opening connected to the accommodating cavity, the third boss has a first side wall connected to the starting end of the third guide surface, the fourth boss has a second side wall connected to the starting end of the fourth guide surface, and the first side wall and / or the second side wall are provided with a first drainage port connected to the drainage cavity.

13. The spray arm assembly according to claim 10, characterized in that: The third boss and / or the fourth boss has a drainage cavity, the drainage cavity has a bottom opening connected to the accommodating cavity, the third boss has a first inner peripheral wall connected to an end of the third guide surface close to the water retaining portion, the fourth boss has a second inner peripheral wall connected to an end of the fourth guide surface close to the water retaining portion, the first inner peripheral wall and / or the second inner peripheral wall is provided with a communication port connected to the drainage cavity, The lower end surface of the water guide portion is provided with a recessed portion connected to the first water outlet. In the first position, the water retaining portion abuts against the lower end surface of the water guide portion, and the water retaining portion is spaced apart from the bottom surface of the recessed portion. The recessed portion connects the communication port and the water guide channel.

14. The spray arm assembly according to claim 10, characterized in that: The third boss and / or the fourth boss have a drainage cavity therein, the drainage cavity has a bottom opening connected to the accommodating cavity, the third boss has a first peripheral wall connected to an end of the third guide surface away from the water retaining portion, the fourth boss has a second peripheral wall connected to an end of the fourth guide surface away from the water retaining portion, the first peripheral wall and / or the second peripheral wall are provided with an avoidance opening, and in the first position, the first through hole and / or the second through hole are radially opposite to and connected to the avoidance opening.

15. The spray arm assembly according to claim 1, characterized in that: The spray arm comprises a connecting portion and two arm portions, the two arm portions are respectively located on both sides of the connecting portion along a first horizontal direction, and the spray arm is rotatable around a center line of the connecting portion. The first flow channel is connected to the outside through a plurality of first spray holes, and the second flow channel is connected to the outside through a plurality of second spray holes. The opening directions of the plurality of first spray holes along the circumference of the spray arm are the same, and the opening directions of the plurality of second spray holes along the circumference of the spray arm are the same. The opening directions of the first spray holes and the second spray holes located in the same arm portion along the circumference of the spray arm are opposite.

16. The spray arm assembly according to claim 15, characterized in that The first flow channel and the second flow channel are arranged at intervals along a second horizontal direction, the second horizontal direction is perpendicular to the first horizontal direction, and the plurality of first spray holes and the plurality of second spray holes are respectively distributed on both sides of the rotation axis of the spray arm.

17. A dishwasher, characterized in that: Comprising a spray arm assembly according to any one of claims 1-16.

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