CN211243238U

CN211243238U - Dish washing machine

Info

Publication number: CN211243238U
Application number: CN201921222192.5U
Authority: CN
Inventors: 朱泽春; 陈宁涛; 陈瑜; 杨夫健
Original assignee: Joyoung Co Ltd
Current assignee: Hangzhou Jiuchuang Home Appliances Co ltd
Priority date: 2019-07-30
Filing date: 2019-07-30
Publication date: 2020-08-14
Anticipated expiration: 2029-07-30

Abstract

The utility model discloses a dish washing machine, the drinking cup of being connected bottom the inner bag in organism and with the inner bag including the organism, locating the organism, the inner bag is formed with washs the chamber, washs the intracavity and is equipped with spray set, water in the drinking cup is supplied with to spray set, spray set includes spray arm, connecting piece and cavity and runs through the axle, spray arm has central through-hole, rivers passageway and sprays the mouth, rivers passageway and spraying mouth intercommunication, cavity run through the axle pass central through-hole with the connecting piece is connected and will spray arm axial positioning, and the inside runner and the drinking cup intercommunication of cavity running through axle, cavity run through the lateral wall of axle and be equipped with the lateral wall delivery port, and cavity runs through the inside runner of axle and passes through lateral wall delivery port intercommunication rivers passageway. The utility model discloses a dish washer, the spray assembly height can freely set up, sprays effectually, simple structure and easy dismounting.

Description

Dish washing machine

Technical Field

The utility model relates to a kitchen appliance especially relates to a dish washer.

Background

In today's society, dishwashers have become an indispensable kitchen appliance for the home.

In the existing dish washer, the spray arm is usually arranged in an inner cavity pipeline of the water inlet channel and is fixedly connected with the pipeline in a buckling mode to realize rotary spraying. Most of the designs have complex structures, on one hand, the water inlet rotating shaft in the middle of the spraying arm must have enough height to ensure that the spraying arm does not deflect in the rotating washing process, and the rotating shaft is usually arranged higher, so that the space height of the whole spraying assembly is higher, and the overall height of the dish washing machine is objectively increased; on the other hand, the buckle is easy to deform or the friction resistance is increased to cause the spraying arm to have poor spraying effect, and the buckle is easy to break in the process of detaching the spraying arm.

SUMMERY OF THE UTILITY MODEL

The utility model provides a dish washer, the spray assembly height can freely set up, sprays effectually, simple structure and easy dismounting.

In order to achieve the above purpose, the utility model discloses the technical scheme who adopts is:

the utility model provides a dish washing machine, includes the organism, locates the inner bag in the organism and the drinking cup of being connected bottom the inner bag, the inner bag is formed with the washing chamber, washs the intracavity and is equipped with spray set, water in the drinking cup is supplied with to spray set, spray set includes spray arm, connecting piece and cavity and runs through the axle, spray arm has central through-hole, rivers passageway and sprays the mouth, rivers passageway and spraying mouth intercommunication, the cavity run through the axle pass central through-hole with the connecting piece is connected and will spray arm axial positioning, and the inside runner and the drinking cup intercommunication of axle are run through to the cavity, and the lateral wall that the axle was run through to the cavity is equipped with the lateral wall delivery port, and the inside runner that the axle was run through to the cavity passes through lateral wall delivery.

Preferably, the end part of the hollow penetrating shaft penetrating through the spray arm is a closed end, and the inner end surface of the closed end is a convex spherical cambered surface for guiding water flow to the water flow channel.

Preferably, the connector is in threaded, snap-fit or adhesive connection with the closed end of the hollow penetrating shaft.

Preferably, the outer side of the hollow penetrating shaft is provided with a first step of the axial positioning spray arm, and the connecting piece is provided with a second step of the axial positioning spray arm.

Preferably, a wear-resistant and drag-reduction gasket is arranged between the first step and the spray arm and/or between the spray arm and the second step.

Preferably, the spray arm is provided with a sleeve ring, the sleeve ring is sleeved on the periphery of the hollow penetrating shaft, and the sleeve ring is in clearance fit with the hollow penetrating shaft so that the spray arm can rotate relative to the hollow penetrating shaft.

Preferably, the outer side wall of the hollow penetrating shaft is provided with a plurality of annular ribs, the lantern ring is sleeved on the periphery of the annular ribs, and a roundabout water leakage channel is formed between the annular ribs and the lantern ring.

Preferably, a switching module is arranged in the cleaning cavity and comprises a water inlet box body, the water inlet box body is provided with a water inlet hole and a water outlet hole which are eccentrically arranged, the water inlet box body and the hollow penetrating shaft are integrally formed or fixedly installed, the water outlet hole is communicated with an internal flow passage of the hollow penetrating shaft, and the water inlet hole is communicated with the water cup through a circulating water pipeline.

Preferably, the switching module comprises an adjusting piece for adjusting the distance between the water inlet hole and the water outlet hole, the adjusting piece is connected with the water inlet box body in a sliding mode, one of the water inlet hole and the water outlet hole is formed in the adjusting piece, and the other water inlet hole is formed in the water inlet box body.

Preferably, the hollow penetrating shaft penetrates through the spray arm upwards to be connected with the connecting piece or penetrates through the spray arm downwards to be connected with the connecting piece.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the hollow through shaft penetrates through the central through hole of the spray arm and is connected with the connecting piece at the other side of the spray arm, so that water flows into the water flow channel of the inner cavity of the rotary spray arm from the side surface after passing through the hollow through shaft during washing, and then is sprayed out through the spray opening of the spray arm to wash tableware and other articles in the cavity.

2. The spraying assembly is connected with the water cup through the switching module, and the switching module is provided with an adjusting piece for adjusting the distance between the water inlet hole and the water outlet hole, so that the spraying assembly is not required to be connected with water supply devices such as the water cup and a water tank through an external water pipe.

3. The inner end face of the closed end of the hollow penetrating shaft facing the water inlet in the water inlet direction is a convex spherical cambered surface, so that the water flow direction can be guided, the water inlet is reflected and guided to the water flow channel of the inner cavity of the spray arm, and the water pressure loss of the water inlet is reduced.

4. The side of the spray arm close to the connecting piece or the water inlet pipe and the switching module is provided with the wear-resistant anti-drag washer, so that the contact friction resistance of the static piece such as the water inlet pipe, the switching module, the hollow penetrating shaft and the connecting piece and the movable piece spray arm in the working process of the spray arm assembly can be reduced, the rotary spray efficiency of the spray arm is improved, the material loss in the friction process is reduced, and the service life of the material and the cleaning efficiency of the dish washing machine are improved.

5. The structure such as the lantern ring and the annular rib is arranged between the hollow penetrating shaft and the spray arm to form a circuitous water leakage channel, so that the water flow pressure loss on the side surface of the central through hole between the hollow penetrating shaft and the spray arm in the rotating process of the spray arm can be effectively reduced.

Drawings

FIG. 1 is a schematic structural view of a dishwasher according to the present invention;

fig. 2 is a schematic structural view of a spray assembly in embodiment 1 of the present invention;

FIG. 3 is a schematic view (I) of a partial structure of the spray assembly of FIG. 2;

FIG. 4 is a schematic view (II) of a partial structure of the spray assembly of FIG. 2;

fig. 5 is a schematic view (one) of a connection structure of a spray assembly and a water inlet pipe in embodiment 1 of the present invention;

fig. 6 is a schematic view (ii) of a connection structure between a spray assembly and a water inlet pipe in embodiment 1 of the present invention;

fig. 7 is a schematic view (iii) of a connection structure between a spray assembly and a water inlet pipe in embodiment 1 of the present invention;

fig. 8 is a schematic structural view of a spray assembly and a switching module according to embodiment 1 of the present invention;

FIG. 9 is an exploded view of the spray assembly and adaptor module of FIG. 8;

fig. 10 is a schematic structural view of a spray assembly and a switching module according to embodiment 2 of the present invention;

FIG. 11 is a partial schematic view of the spray assembly and adaptor module of FIG. 10;

FIG. 12 is an exploded view of the spray assembly and adaptor module of FIG. 10;

fig. 13 is an enlarged schematic view at a in fig. 12.

In the figure, 1-machine body, 2-inner container, 3-water cup, 4-spraying assembly, 5-switching module, 6-water inlet pipe, 7-water tank, 41-spraying arm, 42-connecting piece, 43-hollow through shaft, 44-wear-resistant anti-drag washer, 51-water inlet box body, 52-adjusting piece, 411-spraying opening, 412-water flow channel, 413-first lantern ring, 414-second lantern ring, 421-second step, 431-side wall water outlet, 432-closed end, 433-first step, 434-annular rib, 435-circuitous water leakage channel and 436-hollow through shaft upper side wall.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments shown in the drawings. However, these embodiments are not intended to limit the present invention, and structural, methodical, or functional changes that may be made by one of ordinary skill in the art based on these embodiments are all included in the scope of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

Example 1

As shown in figure 1, the dish washing machine comprises a machine body 1, an inner container 2 arranged in the machine body 1 and a water cup 3 connected with the bottom of the inner container 2, wherein a cleaning cavity is formed in the inner container 2, a spraying assembly 4 is arranged in the cleaning cavity, water in the water cup 3 can be supplied to the spraying assembly 4 through a water inlet pipe by a water pump and the like, and the washing of tableware in the inner container 2 is realized. A bowl basket can be arranged in the inner container 2, and tableware such as bowls and dishes which need to be cleaned can be arranged on the bowl basket.

As shown in fig. 2 to 4, the spray assembly 4 includes a spray arm 41, a coupling member 42, and a hollow penetration shaft 43, and the hollow penetration shaft 43 penetrates through a central through hole of the spray arm 41 and is detachably coupled to the coupling member 42 at the other side of the spray arm 41. The directions of the arrows in the figure all indicate the water flow direction. The spraying component 4 can be arranged at the top or the bottom of the inner container 2, can also be hung on a bowl basket, and can adopt an upward or downward spraying mode. The utility model discloses a spray assembly height can freely set up, sprays effectually, and simple structure and easy dismounting can extensively be applicable to various needs and spray abluent scene.

The spray arm 41 is provided with a central through hole, a water flow channel 412 and a spray opening 411, the water flow channel 412 is located in the hollow inner cavity of the spray arm 41, the spray opening 411 is arranged on two sides of the spray arm 41 and communicated with the water flow channel 412, and the middle part of the central through hole is communicated with the water flow channel 412.

The hollow penetrating shaft 43 may be a hollow cylindrical structure. The hollow penetrating shaft 43 penetrates through the central through hole of the spray arm 41 to be connected with the connecting piece 42 so as to axially position the spray arm 41, the internal flow passage of the hollow penetrating shaft 43 is communicated with the water cup 3, the side wall of the hollow penetrating shaft 43 is provided with a side wall water outlet 431, and the internal flow passage of the hollow penetrating shaft 43 is communicated with the water flow channel 412 through the side wall water outlet 431. The end of the hollow through shaft 43 passing through the spray arm 41 is a closed end 432, and the closed end 432 is connected with the connecting member 42.

The hollow through shaft 43 may pass through the spray arm 41 upward to connect with the connecting member 42, or may pass through the spray arm 41 downward to connect with the connecting member 42. Specifically, to reduce the pressure loss of the inlet water, the inner end surface of the closed end 432 of the hollow penetrating shaft 43 facing the inlet water inlet direction is configured as a convex spherical arc surface to guide the flow of the inlet water to the flow channel 412 in the inner cavity of the spray arm 41.

The connector 42 may include a top cover having a sealing plug attached to the bottom center thereof and a sidewall portion around the periphery of the top cover, with or without the sidewall portion of the connector 42 passing through the central through hole of the shower arm 41. The outer end face of the closed end 432 of the hollow through shaft is provided with a cavity in which the sealing plug is inserted. In this manner, the periphery of the connector 42 forms a flange-like ledge having a maximum effective diameter that is the maximum effective diameter of the connector 42.

The maximum effective diameter of the connecting member 42 is larger than the effective diameter of the central through hole of the shower arm 41 for the stability of the entire structure. Considering that the central through hole of the spray arm 41 may have different diameters from top to bottom, the diameter of the central through hole is generally larger on the side close to the water inlet than on the side close to the connecting member 42, and therefore the maximum effective diameter of the connecting member 42 should be larger than the effective diameter of the central through hole of the spray arm 41 on the side close to the connecting member 42.

The connection means of the connecting member 42 and the closed end 432 of the hollow through shaft 43 is a detachable connection, which may be a threaded connection, a snap connection or an adhesive connection. For example, the inner side of the sidewall of the connecting member 42 may be connected to the outer edge of the closed end 432 of the hollow penetrating shaft 43, and in this embodiment, a threaded connection is adopted, specifically: the inner side of the side wall of the connecting piece 42 is provided with internal threads, the outer edge of the closed end 432 of the hollow penetrating shaft 43 is provided with external threads, and the inner side of the side wall of the connecting piece 42 is in threaded connection with the outer edge of the closed end 432 of the hollow penetrating shaft 43.

The rotation efficiency of the spray arm is reduced due to the fitting connection between the spray arm 41 and the side wall of the connecting member 42, and for this reason, a hollow penetrating shaft upper side wall 436 is extended above the side wall water outlet 431 and near the connecting member 42 at the periphery of the closed end 432 of the hollow penetrating shaft 43, as shown in fig. 4. The upper side wall 436 of the hollow penetrating shaft is effectively matched with the inner wall of the central through hole of the spray arm 41, so that the connecting piece 42 does not penetrate through the central barrel hole of the spray arm 41, and the hollow penetrating shaft 43 completely penetrates through the central through hole of the spray arm 41, thereby reducing the increase of the rotating friction with the spray arm 41 caused by the coaxiality error of the connection of the connecting piece 42 and the hollow penetrating shaft 43 and reducing the spray cleaning effect of the dishwasher.

Referring to fig. 5 to 7, the spraying component 4 and the water cup 3 can be communicated through a water inlet pipe, and the used water inlet pipe 6 can be a straight pipe or an L-shaped bent water inlet pipe. During washing, water flows through the hollow through shaft 43 from the water inlet pipe, flows into the water flow channel 412 in the inner cavity of the rotary spray arm 41 from the side surface, and is sprayed through the plurality of spray nozzles 411 of the spray arm 41 to wash articles such as tableware in the cleaning cavity.

As shown in fig. 5, the water inlet pipe 6 can be a straight pipe, the water flow direction of the water inlet pipe 6 leading to the hollow through shaft 43 is upward, the spraying direction of the spraying opening 411 of the spraying arm 41 is upward, and the water inlet pipe is used for washing the tableware above the spraying arm 41; as shown in fig. 6, the inlet pipe 6 is L-shaped and bent and is arranged in the water pipe, the water flow direction of the inlet pipe 6 leading to the hollow penetrating shaft 43 is downward, the spraying direction of the spraying opening 411 of the spraying arm 41 is downward, and the inlet pipe is used for washing the tableware below the spraying arm 41; as shown in FIG. 7, the inlet pipe 6 is L-shaped and bent and is inserted into the water pipe, the water flow direction of the inlet pipe 6 leading to the hollow penetrating shaft 43 is downward, the spraying direction of the spraying opening 411 of the spraying arm 41 is upward, and the inlet pipe is used for washing the tableware above the spraying arm 41.

Referring to fig. 8 to 9, the spraying assembly 4 and the water cup 3 can also be connected through the adapter module 5, and the adapter module 5 is arranged in the cleaning cavity. Specifically, switching module 5 is including the box body 51 of intaking, and the box body 51 of intaking has inlet opening and the apopore of mutual eccentric settings, and the inside runner intercommunication of axle 43 is run through to the apopore and the cavity of the box body 51 of intaking, and the inlet opening of the box body 51 of intaking passes through circulating water pipeline and cup 3 intercommunication. Here, the water inlet case 51 and the hollow penetration shaft 43 may be integrally formed, or may be assembled and fixed to each other. During washing, water enters the switching module 5 from the water inlet hole, flows through the hollow penetrating shaft 43, flows into the water flow channel 412 in the inner cavity of the rotary spray arm 41 from the side surface, and is sprayed out through the plurality of spray ports 411 of the spray arm 41 to wash articles such as tableware in the cleaning cavity.

In order to adjust the distance between the water inlet and the water outlet, the switching module 5 may further include an adjusting member 52 for adjusting the distance between the water inlet and the water outlet, so that the water inlet device is convenient for occasions far away from the spray assembly 4, such as being applied to a distance-adjustable water tank type dishwasher. The outer side of the machine body 1 is provided with a water tank 7, and the water tank 7 is communicated with the water cup 3. The adjusting part 52 is connected with the water inlet box body 51 in a sliding way, one of the water inlet hole and the water outlet hole is arranged on the adjusting part 52, and the other is arranged on the water inlet box body 51. Therefore, the spraying assembly 4 does not need an external water pipe to be communicated with water supply devices such as the water cup 3 and the water tank 7, and can be communicated with the water supply devices such as the water cup 3 and the water tank 7 only by the switching module 5 with the adjusting piece 52.

In addition, at least one effective closing step can be formed between the hollow through shaft 43 and the water inlet pipe 6 or the adapter module 5, so that the effective diameter of the water inlet pipe 6 or the adapter module 5 is larger than that of the hollow through shaft 43, and the spray arm cannot be separated from the hollow through shaft 43 in the rotary spraying process. For example, the hollow penetrating shaft 43 may be provided with a first step 433 on the outside thereof to axially position the shower arm 41, and the connecting member 42 may be provided with a second step 421 to axially position the shower arm 41.

In particular, in order to reduce the contact friction resistance between the stationary components such as the water inlet pipe 6, the adapter module 5, the hollow through shaft 43 and the connecting member 42 and the movable spray arm 41 during the operation of the spray arm assembly, so as to improve the rotating spray efficiency of the spray arm 41 and also reduce the material loss during the friction process, a wear-resistant and drag-reducing washer 44 is particularly arranged on the side of the spray arm 41 close to the connecting member 42 or the side of the water inlet pipe 6 and the adapter module 5, so as to improve the material life and the washing efficiency of the dishwasher.

Here, the number and shape of the anti-friction washers 44 can be selected according to actual needs to obtain better anti-friction effect, for example, the anti-friction washers 44 at each position can be arranged in pairs two by two. As shown in fig. 2-7, a friction reducing washer 44 may be disposed between the first step 433 and the spray arm 41, or between the spray arm 41 and the second step 421, or both. Of course, if the connecting member 42 is made of wear-resistant material, the spray arm 41 may not be provided with the wear-resistant and drag-reduction washer 44 on the side close to the connecting member 42, i.e., between the spray arm 41 and the second step 421.

Example 2

The present embodiment 2 differs from the embodiment 1 in that the connection member 42 is connected to the closed end 432 of the hollow penetrating shaft 43 in such a manner that the sealing plug of the connection member 42 is connected to the inner wall of the cavity of the closed end 432 of the hollow penetrating shaft 43, as shown in fig. 10 to 13.

In this embodiment, the connecting member 42 is connected to the closed end 432 of the hollow penetrating shaft 43 by a screw thread: the outer side of the sealing plug of the connecting piece 42 is provided with an external thread, the inner wall of the cavity of the closed end 432 is provided with an internal thread, and the sealing plug of the connecting piece 42 is in threaded connection with the inner wall of the cavity of the closed end 432 of the hollow penetrating shaft 43. Of course, other connection structures such as a snap connection or an adhesive connection may be used.

In particular, in order to reduce the pressure loss of the water flow from the side of the hollow penetration shaft 43 and the center through hole of the shower arm 41 during the rotation of the shower arm 41, a corresponding structure may be provided between the hollow penetration shaft 43 and the shower arm 41 to form the detour water leakage path 435, thereby effectively reducing the pressure loss of the water flow.

The spray arm 41 may be provided with a collar that is fitted around the periphery of the hollow penetrating shaft 43, and the collar and the hollow penetrating shaft 43 are in clearance fit so that the spray arm 41 can rotate relative to the hollow penetrating shaft 43. Specifically, the collar may include a first collar 413 for inserting the closed end 432 of the hollow penetrating shaft 43 and a second collar 414 for inserting the water inlet of the hollow penetrating shaft 43, and the first collar 413 and the second collar 414 are respectively in clearance fit with two ends of the hollow penetrating shaft 43. As shown in fig. 13, the inner diameter of the upper end of the first collar 413 is smaller than the inner diameter of the lower end of the first collar 413, and the inner diameters of the upper and lower ends of the second collar 414 are the same.

The outer side wall of the hollow penetrating shaft 43 may be provided with a plurality of annular ribs 434, for example, the outer side wall of the closed end 432 of the hollow penetrating shaft 43 and the outer side wall of the water inlet of the hollow penetrating shaft 43 may play a role in stabilizing and reducing axial swing in the rotating process of the spray arm 41. The first collar 413 and the second collar 414 are sleeved on the periphery of the annular rib 434, and a circuitous water leakage channel is formed between the annular rib 434 and the first collar 413 and the second collar 414. Each annular rib 434 may be of an uninterrupted configuration closed end-to-end at 36 °.

Thus, the collar and the annular rib 434 are arranged to make the outer diameter of the hollow penetrating shaft 43 present a plurality of steps to form a step-shaped matching structure with different diameters, the diameter of the central through hole of the spray arm 41 is different between the position close to the water inlet direction and the position close to the connector 42, and the diameter of the position close to the connector 42 is smaller than that of the position close to the water inlet direction. Therefore, the gap between the hollow through shaft 43 and the spray arm 41 inside the spray assembly 4 forms a tortuous path, which effectively reduces the amount of water leakage from the gap and increases the water outlet pressure for spraying and cleaning the tableware.

Above-mentioned step form cooperation structure forms four pairs of assorted inside and outside footpath cooperation relations, includes: the outer diameter D1 of the annular rib 434 at the water inlet of the hollow penetrating shaft 43 corresponds to the inner diameter D1 of the second collar 414; the outer diameter of the annular rib 434 outside the closed end 432 of the hollow penetrating shaft 43 is D2, and correspondingly, the inner diameter of the first collar 413 is D4; the maximum effective outer diameter of the hollow penetrating shaft 43 is D3, and correspondingly, the minimum effective inner diameter of the central through hole of the spray arm 41 is D3; the minimum effective outer diameter of the hollow penetrating shaft 43 is D4 and the minimum inner diameter of the first collar 413 is D2. The inner diameter and the outer diameter satisfy D1 & gt D1 & gt D3 & gt D3 & gt D4 & gt D2 & gt D2 & gt D4, so that a zigzag and circuitous channel is formed, the water pressure loss of the spray arm is effectively reduced, and the washing effect is improved.

This embodiment is through the annular muscle position that sets up D1 position, runs through the radial muscle position of axle 43 through the cavity and supports the location with the diameter terminal surface that sprays 41 central through holes downside (D1 > D3), cancels inlet tube 6 or switching module 5 and the binding off step that axle 43 links up the department through the cavity to effectively reduce the diameter change of inlet port department, reduce the overall structure that sprays subassembly 4, and can guarantee the water pressure cleaning performance who sprays.

Other contents not described in the present embodiment may refer to embodiment 1.

Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. The utility model provides a dish washer, includes the organism, locates the inner bag in the organism and the drinking cup of being connected bottom the inner bag, the inner bag is formed with the washing chamber, washs the intracavity and is equipped with spray set, water in the drinking cup is supplied with to spray set, its characterized in that, spray set includes spray arm, connecting piece and cavity and runs through the axle, spray arm has central through-hole, rivers passageway and sprays the mouth, rivers passageway and the mouth intercommunication that sprays, the cavity run through the axle pass central through-hole with the connecting piece is connected and will spray arm axial positioning, and the inside runner and the drinking cup intercommunication of axle are run through to the cavity, and the lateral wall that the axle was run through to the cavity is equipped with the lateral wall delivery port, and the inside runner that the axle was run through to the cavity passes through lateral.

2. The dishwasher of claim 1, wherein the end of the hollow through shaft passing through the spray arm is a closed end, and the inner end surface of the closed end is a convex spherical arc surface guiding the water flow to the water flow channel.

3. A dishwasher according to claim 2, wherein the connector is threaded, snap-fit or adhesive connected to the closed end of the hollow through-shaft.

4. The dishwasher of claim 1, wherein the hollow through shaft is provided with a first step of an axially positioned spray arm on an outer side thereof, and the connecting member is provided with a second step of the axially positioned spray arm.

5. The dishwasher of claim 4, wherein a friction and drag resistant gasket is provided between the first step and the spray arm and/or between the spray arm and the second step.

6. A dishwasher according to any one of claims 1 to 5, wherein the spray arm is provided with a collar which is fitted around the periphery of the hollow through-shaft and which is in clearance fit with the hollow through-shaft to enable the spray arm to rotate relative to the hollow through-shaft.

7. The dishwasher of claim 6, wherein the outer side wall of the hollow penetrating shaft is provided with a plurality of annular ribs, the collar is sleeved on the periphery of the annular ribs, and a circuitous water leakage channel is formed between the annular ribs and the collar.

8. The dishwasher of any one of claims 1 to 5, wherein a switching module is provided in the washing chamber, the switching module comprises a water inlet box body having a water inlet hole and a water outlet hole which are eccentrically arranged with respect to each other, the water inlet box body and the hollow through shaft are integrally formed or fixedly installed, the water outlet hole is communicated with an internal flow passage of the hollow through shaft, and the water inlet hole is communicated with the water cup through a circulating water pipe.

9. The dishwasher of claim 8, wherein the adapter module comprises an adjusting member for adjusting a distance between the water inlet and the water outlet, the adjusting member is slidably connected to the water inlet box, one of the water inlet and the water outlet is provided on the adjusting member, and the other is provided on the water inlet box.

10. A dishwasher according to any one of claims 1 to 5, wherein the hollow through-shaft is connected to the connecting piece through the spray arm in an axial direction or is connected to the connecting piece through the spray arm in a downward direction.