Spray structure and dishwasher

Abstract

This application relates to the field of dishwasher technology, specifically providing a spray structure and a dishwasher, aiming to solve the problems of low assembly efficiency due to the complex structure of existing dishwasher water supply pipes and spray arm connectors, and excessive frictional resistance between the spray arm and the connector leading to poor rotation and easy wear of components. To address this, the spray structure of this application includes a water supply pipe and a spray arm, with a through hole on the surface of the spray arm facing away from the water inlet; a first connector connecting the water supply pipe and the spray arm, with a through-flow channel on the first connector, the two ends of which are connected to the water outlet and the water inlet respectively; and a second connector passing through the through hole and connecting to the first connector to clamp the spray arm between the first and second connectors. In this application, the spray arm is assembled by mating the first and second connectors, eliminating the need for cumbersome adjustments and calibrations, thus simplifying the assembly process of the spray arm.

Description

Technical Field

[0001] This application relates to the field of dishwasher technology, specifically providing a spray structure and a dishwasher. Background Technology

[0002] In the water system of a dishwasher, the connector, as a core transitional component between the water supply pipe and the spray arm, performs a dual function. Firstly, its internal flow channel design ensures efficient water flow from the water supply pipe to the spray arm, providing stable power for the spray arm's rotation. Secondly, its mechanical structure design supports and positions the spray arm. Therefore, the reliability of the connector directly affects the smoothness of the spray arm's rotation, the uniformity of water flow coverage, and the overall washing performance of the machine, making it a key element in the dishwasher's fluid dynamics design and mechanical transmission optimization.

[0003] Existing connector technologies have significant limitations. Structurally, most employ a multi-component nested design, requiring multi-directional alignment of the water supply pipe ports and spray arm interfaces during installation, and relying on auxiliary tools for fastening, resulting in low assembly efficiency and poor fault tolerance. Mechanically, spray arms generally use a top-suspended connection, concentrating the combined load of their own weight and the impact of water flow pressure on the connector contact surface. Furthermore, the large contact area between the spray arm and the connector increases static friction resistance. This can easily cause sluggish rotation or even jamming of the spray arm, leading to problems such as water flow scattering angle deviation and increased cleaning blind spots. In addition, long-term friction and wear can easily cause deformation of the connector guide groove, exacerbating rotational instability and shortening the service life of core components.

[0004] Therefore, a new technical solution is needed in this field to solve the above problems. Summary of the Invention

[0005] This application aims to solve the above-mentioned technical problems, namely, to solve the problems of low assembly efficiency due to the complex structure of the existing dishwasher water supply pipe and spray arm connector, and the problems of poor rotation and easy wear of parts due to excessive frictional resistance between the spray arm and the connector.

[0006] In a first aspect, this application provides a spray structure, comprising:

[0007] Water supply pipeline with an outlet;

[0008] A spray arm is provided with a water inlet, and a through hole is provided on the surface of the spray arm opposite to the water inlet;

[0009] A first connector is connected between the water supply pipeline and the spray arm. The first connector is provided with a flow passage that passes through it. The two ends of the flow passage are respectively connected to the water outlet and the water inlet.

[0010] A second connector passes through the through hole and connects to the first connector to clamp the spray arm between the first connector and the second connector.

[0011] Optionally, the first connector includes:

[0012] A connecting seat is disposed within the flow channel, and the connecting seat is provided with a mounting hole. The second connecting member passes through the through hole and is detachably connected to the mounting hole.

[0013] Optionally, the second connector includes a head and a shaft connected to the head, the head being connected to the spray arm, and the shaft passing through the through hole and connected to the mounting hole.

[0014] Optionally, the inner wall of the mounting hole is provided with a plurality of limiting grooves along the circumferential direction, and the shaft portion is provided with a plurality of snap-fit ​​protrusions that cooperate with the limiting grooves, the snap-fit ​​protrusions being snapped into the limiting grooves.

[0015] Optionally, the limiting groove is provided with a first guide surface, and the snap-fit ​​protrusion is provided with a second guide surface that cooperates with the first guide surface.

[0016] Optionally, the outer peripheral surface of the connecting seat extends from the top to the bottom to form a guide surface, and the projection of the guide surface on the spray wall covers the through hole.

[0017] Optionally, a flow-deflecting rib is provided between the inner wall of the flow channel and the connecting seat, and multiple flow-deflecting ribs are provided at circumferential intervals.

[0018] Optionally, the first connector further includes:

[0019] A connecting sleeve, in which the flow channel is formed;

[0020] A disc-shaped connecting part is connected to the outer peripheral wall of the connecting sleeve and extends radially outward. A snap-fit ​​groove is provided on the surface of the disc-shaped connecting part facing the water outlet. A flange that mates with the snap-fit ​​groove is provided at the water outlet. The flange snaps into the snap-fit ​​groove.

[0021] Optionally, an annular gap is formed between the connecting sleeve and the water inlet, and a lubrication groove communicating with the annular gap is provided on the outer peripheral wall of the connecting sleeve.

[0022] In a second aspect, this application provides a dishwasher including a spray structure as described in any one of the first aspects.

[0023] By employing the aforementioned technical solution, the first and second connecting parts of the spray structure provided in this application are mated together, clamping the spray arm between them. This not only simplifies the assembly process and improves assembly efficiency, but also allows the self-locking structure between the connecting parts to adaptively fine-tune the contact pressure under dynamic operating conditions, compensating for instantaneous deformation caused by water flow impact and maintaining rotational stability. This ensures that the spray arm can accurately and stably spray water into every corner of the dishwasher during rotation, ensuring that every part of the dishes fully contacts the water flow, thereby achieving all-round, thorough, and efficient cleaning, effectively removing stubborn stains, and significantly improving the cleaning effect.

[0024] In terms of operational stability, the distributed clamping force formed by the through holes of the second connector can both constrain the axial movement of the spray arm and allow it to rotate freely around the axis, ensuring the stability of the spray arm when rotating at high speed. Furthermore, by adjusting the contact area between the spray arm and the second connector, the rotational friction is reduced, making the spray arm rotate more smoothly and thus improving the spraying effect.

[0025] In summary, due to the advantages of the spray structure, the dishwasher provided in this application can provide efficient cleaning and stable operation, meeting users' needs for high-quality dishwashers. Attached Figure Description

[0026] The preferred embodiments of this application are described below with reference to the accompanying drawings, in which:

[0027] Figure 1 This is a partial cross-sectional view of a spray structure according to an embodiment of this application;

[0028] Figure 2 yes Figure 1 Enlarged structural diagram at point A;

[0029] Figure 3 This is a cross-sectional structural schematic diagram of a first connector according to an embodiment of this application;

[0030] Figure 4 This is a schematic diagram of the structure of a second connector according to an embodiment of this application. List of reference signs:

[0031] 1-Water supply pipeline, 10-Water outlet, 101-Flange, 2-Spray arm, 20-Water inlet, 21-Through hole;

[0032] 3-First connector, 31-Connecting sleeve, 310-Flow passage, 32-Disc-shaped connecting part, 321-Snap-fit ​​groove, 322-Lubrication groove, 33-Connecting seat, 331-Mounting hole, 3311-Limiting groove, 3312-First guide surface, 3313-Stop rib, 332-Flow guide surface, 34-Break rib;

[0033] 4-Second connector, 41-Head, 42-Shaft, 421-Snap-fit ​​protrusion, 422-Second guide surface, 423-Annular boss. Detailed Implementation

[0034] Preferred embodiments of this application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0035] It should be noted that in the description of this application, terms such as "upper," "lower," "left," "right," "inner," and "outer," which indicate direction or positional relationship, are based on the direction or positional relationship shown in the accompanying drawings. These terms are used merely for ease of description and do not indicate or imply that the relevant device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, ordinal numbers such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] Furthermore, it should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0037] In the water system of a dishwasher, the connector is the core transition component between the water supply pipe and the spray arm. Its reliability directly affects the smoothness of the spray arm's rotation, the uniformity of water flow coverage, and the overall washing performance of the machine. It is a key node in the hydrodynamic design and mechanical transmission optimization of the dishwasher.

[0038] However, existing connector technologies have significant limitations. Structurally, most employ a multi-component nested design, requiring multi-directional alignment of the water supply pipe ports and spray arm interfaces during installation, and relying on auxiliary tools for fastening, resulting in low assembly efficiency and poor fault tolerance. From a mechanical perspective, spray arms generally use a top-suspended connection, where the combined load formed by their own weight and the impact of water flow pressure is concentrated on the contact surface of the connector. Furthermore, the large contact area between the spray arm and the connector increases static friction resistance, easily causing sluggish rotation or even jamming of the spray arm, leading to problems such as water flow scattering angle deviation and increased cleaning blind spots. In addition, long-term friction and wear can easily cause deformation of the connector guide groove, exacerbating rotational instability and shortening the service life of core components.

[0039] Therefore, this application provides a new spray structure to solve the above-mentioned problems.

[0040] Please refer to Figure 1 The diagram shows a partial cross-sectional view of a spray structure according to an embodiment of this application. The spray structure includes a water supply pipe 1 and a spray arm 2 connected to the water supply pipe 1. The water supply pipe 1 is the water source delivery channel of the spray structure, and its main function is to guide water to the spray arm 2. A cavity is formed inside the spray arm 2, and multiple spray nozzles (not shown in the figure) communicating with the cavity are provided on the spray arm 2.

[0041] When the spray structure is working, the water flows into the cavity of the spray arm 2 along the water supply pipe 1, and finally sprays out at high speed from each spray nozzle, thereby realizing the spraying function. Figure 1 The direction indicated by the middle arrow is the direction of water flow throughout the process.

[0042] Reference Figure 2 A stable connection is achieved between the water supply pipe 1 and the spray arm 2 via a connecting assembly. In this embodiment, the connecting assembly includes a first connector 3 and a second connector 4.

[0043] Specifically, the first connector 3 is connected to the outlet 10 of the water supply pipeline 1, and a flow passage 310 is formed inside it. One end of the flow passage 310 is connected to the outlet 10, and the other end is connected to the inlet 20 of the spray arm 2. In this way, water can flow from the outlet 10 into the inlet 20 through the flow passage 310 and then into the spray arm 2.

[0044] Furthermore, a through hole 21 is provided on the side wall of the spray arm 2 away from the water inlet 20, which mates with the second connector 4. During installation, the second connector 4 is pushed axially from the outside of the spray arm 2 and passes through the through hole 21, forming a self-locking connection with the first connector 3. This allows the spray arm 2 to be securely clamped between the first connector 3 and the second connector 4, forming a robust integral structure.

[0045] Specifically, the second connector 4 and the first connector 3 can be installed in various ways. For example, the second connector 4 can be connected by a threaded connection; or, a snap-fit ​​connection can be used, with a snap-fit ​​on the first connector 3 and a corresponding slot or protrusion on the second connector 4, which automatically engages when inserted to achieve connection; or, a pin connection can be used, etc.

[0046] In this embodiment, the spray arm 2 is assembled by mating the first connector 3 and the second connector 4. Compared with the traditional complex assembly method, the operator only needs to align the first connector 3 and the second connector 4 to complete the installation of the spray arm 2, without the need for tedious adjustments and calibrations, thus simplifying the assembly process of the spray arm 2. Simultaneously, the self-locking structure between the connectors can adaptively fine-tune the contact pressure under dynamic operating conditions, compensating for instantaneous deformation caused by water flow impact and maintaining rotational stability.

[0047] Furthermore, the distributed clamping force formed by the second connector 4 through the through hole 21 can both constrain the axial movement of the spray arm 2 and allow it to rotate freely around the axis.

[0048] Furthermore, in this embodiment, since the spray arm 2 is actually "sat" on the first connector 3 through the second connector 4 to achieve the connection with the water supply pipe 1, the rotational friction of the spray arm 2 can be reduced by adjusting the contact area between the spray arm 2 and the second connector 4.

[0049] Specifically, the contact surface between the spray arm 2 and the second connecting member 4 can be specially designed. For example, a protrusion or groove structure can be provided at the contact portion between the spray arm 2 and the second connecting member 4. A protrusion structure ensures that the contact between the two occurs only at the top of the protrusion, greatly reducing the actual contact area; while a groove structure can reduce the contact area while ensuring a certain degree of connection stability. With such a design, the friction between the spray arm 2 and the second connecting member 4 will be significantly reduced during the rotation of the spray arm 2.

[0050] In addition, friction can be further reduced from the perspective of materials and surface treatment. Selecting materials with a low coefficient of friction for the contact parts between the spray arm 2 and the second connector 4, or polishing or coating these contact surfaces to make them smoother and reduce surface roughness, also helps to reduce friction.

[0051] When the rotational friction of the spray arm 2 decreases, it brings several benefits. On the one hand, it reduces the driving force required for rotation, reduces energy consumption, and improves the energy utilization efficiency of the entire spray structure. On the other hand, the reduced friction also allows the spray arm 2 to rotate more smoothly, thereby making the spraying more uniform and stable, and improving the spraying effect.

[0052] In one feasible approach, refer to Figure 2 and 4 The second connector 4 consists of a head 41 and a shaft 42. The radial dimension of the head 41 is larger than the radial dimension of the through hole 21 on the spray arm 2, so that when the head 41 is connected to the spray arm 2, it can abut against the surface of the spray arm 2 without passing through the through hole 21, thereby playing a role in limiting and supporting.

[0053] To further optimize the contact between the second connector 4 and the spray arm 2, a boss is specially provided on the surface of the head 41 facing the spray arm 2. The diameter of this boss is smaller than the diameter of the head 41. This smaller diameter boss can effectively reduce the contact area with the spray arm 2. According to the relevant principles of friction, under constant pressure, a smaller contact area helps to reduce friction. This makes the spray arm 2 rotate more smoothly around its axis.

[0054] In one embodiment, reference Figure 2 and 3 The first connector 3 is mainly composed of a connecting sleeve 31 and a disc-shaped connecting part 32 extending radially outward from the outer peripheral wall of the connecting sleeve 31.

[0055] An annular snap-fit ​​groove 321 is provided on the surface of the disc-shaped connecting part 32 facing the water outlet 10 of the water supply pipe 1. Correspondingly, a flange 101 matching the snap-fit ​​groove 321 is provided circumferentially along the water outlet 10 of the water supply pipe 1. During assembly, the flange 101 at the water outlet 10 can snap into the snap-fit ​​groove 321, thus realizing the fixed connection between the first connecting part 3 and the water supply pipe 1.

[0056] Furthermore, the aforementioned flow passage 310 is formed inside the connecting sleeve 31. In order to ensure that the water does not leak when it enters the spray arm 2 from the water supply pipe 1, the outlet 10 of the water supply pipe 1 is inserted into the inside of the connecting sleeve 31 from the inlet end of the connecting sleeve 31 so that the water can directly enter the flow passage 310 from the outlet 10.

[0057] Furthermore, the outlet end of the connecting sleeve 31 is inserted into the inlet 20, thereby creating a continuous water flow channel and reducing the possibility of water overflowing from the outlet 10.

[0058] In one embodiment, to ensure smooth rotation of the spray arm 2 around the connecting sleeve 31, an annular gap is formed between the water outlet end of the connecting sleeve 31 and the water inlet 20. During actual operation, when water flows into the spray arm 2 through the flow channel 310, some of it may flow into this annular gap. When the water enters the annular gap, it acts like a lubricant for mechanical operation, effectively reducing the friction between the connecting sleeve 31 and the water inlet 20. This provides good lubrication for the rotation of the spray arm 2 around the first connecting member 3, making the rotation of the spray arm 2 smoother and more flexible.

[0059] Furthermore, the outer peripheral wall of the connecting sleeve 31 is provided with multiple lubrication grooves 322 that communicate with the annular gap. When water flows into the annular gap, without the lubrication grooves 322, a continuous and uniform water film may form due to the surface tension of the water. However, when the water flows into the annular gap and comes into contact with the lubrication grooves 322, the structure of the lubrication grooves 322 breaks the continuous water surface that may have formed at the contact point between the connecting sleeve 31 and the water inlet 20, avoiding adsorption or obstruction caused by water surface tension, and further ensuring the flexibility and smoothness of the rotation of the spray arm 2.

[0060] In one feasible embodiment, the connecting sleeve 31 of the first connector 3 is further provided with a connecting seat 33, which is connected to the inner wall of the connecting sleeve 31. A flow channel 310 is formed between the connecting seat 33 and the connecting sleeve 31 to provide a water flow channel.

[0061] The connecting seat 33 is mainly used to connect with the second connecting member 4. Specifically, the connecting seat 33 has an axially oriented mounting hole 331 that mates with the first connecting member 3, so that the second connecting member 4 can be connected to the mounting hole 331 after passing through the through hole 21.

[0062] Of course, the second connector 4 and the connector 33 can be installed in various ways. For example, the mounting hole 331 is provided with threads, and the second connector 4 is connected by the threaded connection; or, a snap-fit ​​connection is used, with a snap-fit ​​set on the edge or inside of the mounting hole 331, and the second connector 4 has a corresponding slot or protrusion, and the snap-fit ​​automatically engages when inserted to achieve connection; or, a pin connection is used, etc.

[0063] In this embodiment, the second connector 4 and the connector 33 are connected by a snap-fit ​​method, which ensures the stability of the connection and facilitates installation and disassembly.

[0064] Specifically, refer to Figure 3 and 4 The diameter of the shaft portion 42 of the second connector 4 is adapted to the inner diameter of the through hole 21, and multiple snap-fit ​​protrusions 421 are spaced circumferentially on the outer peripheral wall of the shaft portion 42. Correspondingly, multiple limiting grooves 3311 that mate with the limiting protrusions are evenly arranged circumferentially on the inner wall of the mounting hole 331. A first guide surface 3312 is provided at the entrance of the limiting groove 3311. The first guide surface 3312 has a certain inclination angle, and its function is to guide the snap-fit ​​protrusions 421 to smoothly enter the limiting groove 3311, thereby improving the installation efficiency.

[0065] Meanwhile, the snap-fit ​​protrusion 421 is provided with a second guide surface 422 that cooperates with the first guide surface 3312. When the shaft part 42 is inserted into the mounting hole 331 along the first guide surface 3312, the second guide surface 422 abuts against the first guide surface 3312, and under the combined action of the two, the second connector 4 is stably placed in the mounting hole 331.

[0066] Further, refer to Figure 3 A stop rib 3313 is also provided next to the limiting groove 3311 to prevent the locking protrusion 421 from sliding out of the limiting groove 3311.

[0067] Furthermore, an annular boss 423 is provided on the shaft portion 42 of the second connector 4 to limit its axial displacement.

[0068] In one possible implementation, the outer peripheral surface of the connecting seat 33 extends from the top to the bottom to form a guide surface 332. Water can enter the interior of the spray arm 2 along the guide surface 332. The projection of the guide surface 332 in the radial direction of the spray arm 2 can cover the through hole 21, thus guiding the water flow to avoid the through hole 21 and effectively reducing water leakage at the through hole 21.

[0069] In one specific implementation, the guide surface 332 formed by the outer peripheral surface of the connecting seat 33 is a conical surface extending from the top to the bottom of the connecting seat 33, with the larger end of this conical surface close to the through hole 21 of the spray arm 2.

[0070] In one feasible embodiment, a baffle 34 is provided between the connecting sleeve 31 and the connecting seat 33, with multiple baffles 34 spaced apart circumferentially. The baffles 34 not only improve the stability between the connecting seat 33 and the connecting sleeve 31, but also, by providing multiple baffles 34, the water flow is divided into multiple fine streams as it passes through the space between the connecting sleeve 31 and the connecting seat 33, allowing for spraying at a wider angle and with a more uniform distribution, thus improving the coverage and uniformity of the spray.

[0071] This application provides a dishwasher that includes the spray structure described above. Due to the numerous unique features and significant advantages of this spray structure, the dishwasher achieves a qualitative improvement in both performance and user experience.

[0072] In terms of cleaning effect, the docking mechanism of the first connector 3 and the second connector 4 in the spray structure simplifies the assembly process and improves assembly efficiency. Simultaneously, the self-locking structure between the connectors can adaptively fine-tune the contact pressure under dynamic operating conditions, compensating for instantaneous deformation caused by water flow impact and maintaining rotational stability. This ensures that the spray arm 2 can accurately and stably spray water to every corner of the dishwasher's interior during rotation, allowing every part of the dishes to fully contact the water flow, thus achieving all-round, thorough, and efficient cleaning, effectively removing stubborn stains and significantly improving the cleaning effect.

[0073] In terms of operational stability, the distributed clamping force formed by the second connector 4 through the through hole 21 can both constrain the axial movement of the spray arm 2 and allow it to rotate freely around the axis, ensuring the stability of the spray arm 2 when rotating at high speed. Furthermore, by adjusting the contact area between the spray arm 2 and the second connector 4, the rotational friction is reduced, making the spray arm 2 rotate more smoothly and thus improving the spraying effect.

[0074] In summary, due to the advantages of its spray structure, this dishwasher can provide efficient cleaning and stable operation, meeting users' needs for a high-quality dishwasher.

[0075] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A spray structure, characterized in that, include: A water supply pipeline (1) is provided with an outlet (10); A spray arm (2) is provided with a water inlet (20), and a through hole (21) is provided on the surface of the spray arm (2) away from the water inlet (20); The first connector (3) is connected between the water supply pipeline (1) and the spray arm (2). The first connector (3) is provided with a through-flow channel (310) that passes through it. The two ends of the through-flow channel (310) are respectively connected to the outlet (10) and the inlet (20). A second connector (4) passes through the through hole (21) and connects to the first connector (3) to clamp the spray arm (2) between the first connector (3) and the second connector (4).

2. The spray structure according to claim 1, characterized in that, The first connector (3) includes: A connecting seat (33) is disposed in the flow channel (310). The connecting seat (33) is provided with a mounting hole (331). The second connecting member (4) passes through the through hole (21) and is detachably connected to the mounting hole (331).

3. The spray structure according to claim 2, characterized in that, The second connector (4) includes a head (41) and a shaft (42) connected to the head (41). The head (41) is connected to the spray arm (2), and the shaft (42) passes through the through hole (21) and is connected to the mounting hole (331).

4. The spray structure according to claim 3, characterized in that, The inner wall of the mounting hole (331) is provided with a plurality of limiting grooves (3311) along the circumferential direction. The shaft portion (42) is provided with a plurality of snap-fit ​​protrusions (421) that cooperate with the limiting grooves (3311). The snap-fit ​​protrusions (421) are snapped into the limiting grooves (3311).

5. The spray structure according to claim 4, characterized in that, The limiting groove (3311) is provided with a first guide surface (3312), and the snap-fit ​​protrusion (421) is provided with a second guide surface (422) that cooperates with the first guide surface (3312).

6. The spray structure according to claim 2, characterized in that, The outer peripheral surface of the connecting seat (33) extends from the top to the bottom to form a guide surface (332), and the projection of the guide surface (332) on the spray wall covers the through hole (21).

7. The spray structure according to claim 2, characterized in that, A flow-deflecting rib (34) is provided between the inner wall of the flow channel (310) and the connecting seat (33), and multiple flow-deflecting ribs (34) are provided at intervals along the circumference.

8. The spray structure according to any one of claims 2 to 7, characterized in that, The first connector (3) further includes: A connecting sleeve (31) is formed therein, with the flow channel (310) formed therein; A disc-shaped connecting part (32) is connected to the outer peripheral wall of the connecting sleeve (31) and extends radially outward. A snap-fit ​​groove (321) is provided on the surface of the disc-shaped connecting part (32) facing the outlet (10). A flange (101) is provided at the outlet (10) to cooperate with the snap-fit ​​groove (321). The flange (101) is snapped into the snap-fit ​​groove (321).

9. The spray structure according to claim 8, characterized in that, An annular gap is formed between the connecting sleeve (31) and the water inlet (20), and a lubrication groove (322) communicating with the annular gap is provided on the outer peripheral wall of the connecting sleeve (31).

10. A dishwasher, characterized in that, Includes the spray structure as described in any one of claims 1 to 9.

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