WO2021225289A1

WO2021225289A1 - Dishwasher

Info

Publication number: WO2021225289A1
Application number: PCT/KR2021/004292
Authority: WO
Inventors: 김은석; 김영재; 서영수; 최상수; 최현의
Original assignee: 삼성전자주식회사
Priority date: 2020-05-08
Filing date: 2021-04-06
Publication date: 2021-11-11
Also published as: KR20210136745A

Abstract

A dishwasher according to the idea of the present invention comprises: a basket in which dishes are accommodated; and an arm assembly which sprays washing water to wash dishes in the basket, wherein the arm assembly comprises: a first spray arm which is rotatably provided; a second spray arm which is rotatably provided at one side of the first spray arm and receives washing water from the first spray arm; and a rotation guide which has one side coupled to the first spray arm and the other side coupled to the second spray arm and includes a plurality of balls for guiding the rotation of the first spray arm and the second spray arm.

Description

dish wash machine

The present invention relates to a dishwasher, and more particularly, to a dishwasher having an improved structure of an arm assembly.

A dishwasher is a device that automatically cleans food residues on dishes using detergent and washing water.

The dishwasher includes a main body, a washing chamber formed by a tub disposed inside the main body, a storage container disposed inside the washing chamber to accommodate dishes, and an arm assembly provided to spray washing water into the storage container.

The storage container is usually provided in two or three stages, and a plurality of arm assemblies are provided to spray washing water where each storage container is disposed and may be disposed to correspond to the storage container.

The arm assembly may include a plurality of spray arms so as to have a uniform cleaning effect regardless of a seating position of dishes stored in the storage container, and the plurality of spray arms may be provided to rotate.

One aspect of the present invention provides a dishwasher in which rotation of a plurality of spray arms constituting an arm assembly is smooth.

Another aspect of the present invention provides a dishwasher in which the rotation speed of a spray arm is accelerated by sprayed washing water.

A dishwasher according to an aspect of the inventive concept includes: a basket in which dishes are accommodated; an arm assembly that sprays washing water to wash dishes in the basket, wherein the arm assembly includes: a first spray arm rotatably provided; a second spray arm rotatably provided on one side of the first spray arm and receiving washing water from the first spray arm; and a rotation guide having one side coupled to the first spray arm and the other side coupled to the second spray arm, the rotation guide including a plurality of balls for guiding rotation of the first spray arm and the second spray arm; may include.

According to claim 1, wherein the rotation guide comprises an outer ring frame coupled to the first spray arm, and an inner ring frame coupled to the second spray arm, the plurality of balls between the outer ring frame and the inner ring frame can be placed.

The outer ring frame and the inner ring frame form an accommodation space that can accommodate the plurality of balls, and the plurality of balls inserted into the accommodation space are in contact with the outer ring frame and the inner ring frame, and can perform rolling motion. .

The first spray arm includes a mounting portion into which the outer ring frame is inserted,

The second spray arm may include a protrusion to be inserted into the inner ring frame, the outer ring frame may be inserted and fixed to the mounting portion, and the protrusion may be inserted and fixed to the inner ring frame.

The first spray arm includes a first fixing groove formed in the mounting part, the second spray arm includes a second fixing groove formed in the protrusion, and the outer ring frame has a corresponding to the first fixing groove. A first fixing protrusion may be included, and the inner ring frame may include a second fixing protrusion corresponding to the second fixing groove.

The first spray arm and the second spray arm rotate in different directions, the outer ring frame is fixed to the first spray arm and rotates together with the first spray arm, and the inner ring frame rotates with the second spray arm It is fixed to the can rotate together with the second spray arm.

The first spray arm discharges washing water into the second spray arm, and includes a discharge unit formed on one surface of the mounting unit, and the second spray arm corresponds to the discharge unit to receive washing water from the first spray arm. and a supply port formed by the protrusion.

a circulation pump that pumps wash water to the arm assembly; and a connector for supplying the washing water pumped by the circulation pump to the female assembly, wherein the female assembly may be rotatably coupled to the connector.

The rotation guide may be a first rotation guide, and the arm assembly may further include a second rotation guide rotatably coupling the first spray arm to one side of the connector.

The outer ring frame and the inner ring frame are a first outer ring frame and a first inner ring frame, respectively, the second rotation guide includes a second outer ring frame coupled to the connector, and a second inner ring frame coupled to the first spray arm can do.

The first spray arm may be coupled to the second rotation guide and include an inlet through which wash water is introduced, the second outer ring frame may be fixed to the connector, and the inlet portion may be inserted into and fixed to the second inner ring frame. have.

The connector includes a first fixing groove, the first spray arm includes a second fixing groove formed in the inlet, and the second outer ring frame includes a first fixing protrusion corresponding to the first fixing groove. and, the second inner ring frame may include a second fixing protrusion corresponding to the second fixing groove.

The second spray arm may be disposed above the first spray arm.

The rotation guide may be disposed between the first spray arm and the second spray arm.

The rotation guide may further include a support frame for supporting the plurality of balls so that the plurality of balls may be disposed to be spaced apart from each other.

A dishwasher according to another aspect of the inventive concept includes a main body; a basket provided inside the body; a plurality of spray arms that spray the washing water toward the basket and are respectively rotatably arranged in the vertical direction; and a plurality of radial ball bearings mounted under each of the plurality of spray arms, and each of the plurality of spray arms may be coupled to an inner ring of each of the plurality of radial ball bearings corresponding thereto.

The inner space of each of the plurality of spray arms may be connected to each other.

* The plurality of spray arms includes a first spray arm and a second spray arm disposed above the first spray arm, and the outer ring of the radial ball bearing mounted on the lower portion of the second spray arm is the second spray arm. 1 Can be coupled to a spray arm.

a circulation pump for pumping washing water to the first spray arm; It further includes a connector for supplying the washing water pumped by the circulation pump to the first spray arm, and an outer ring of the radial ball bearing mounted under the first spray arm may be coupled to the connector.

The plurality of spray arms may rotate in different directions.

It is possible to provide a dishwasher provided with a rotation guide provided in the plurality of spray arms to facilitate rotation of the spray arms and to rotatably couple the plurality of spray arms to each other.

It is possible to provide a dishwasher capable of accelerating the rotational speed of the spray arm disposed on the upper part by the washing water sprayed from the spray arm disposed on the lower part.

1 is a schematic side cross-sectional view of a dishwasher according to an embodiment of the present invention.

FIG. 2 is a perspective view of a first arm assembly of the dishwasher shown in FIG. 1 ;

3 is an exploded perspective view of the first arm assembly shown in FIG. 2 .

4 is a bottom exploded perspective view of the first arm assembly shown in FIG. 2 .

FIG. 5 is an exploded perspective view of a first rotation guide of the first arm assembly shown in FIG. 2 .

6 is a side cross-sectional view illustrating a lower portion of the dishwasher shown in FIG. 1 .

FIG. 7 is an enlarged view illustrating an enlarged portion A of FIG. 6 .

FIG. 8 is a perspective view illustrating a first arm assembly of another embodiment of the dishwasher shown in FIG. 1 .

9 is a view illustrating a state in which one end of the first arm assembly shown in FIG. 8 is viewed from the front.

FIG. 10 is a perspective view illustrating a first arm assembly of another embodiment of the dishwasher shown in FIG. 1 .

11 is a view illustrating a state in which part B shown in FIG. 10 is viewed in the extension direction of the spray arm.

The configuration shown in the embodiments and drawings described in this specification is only a preferred example of the disclosed invention, and there may be various modifications that can replace the embodiments and drawings of the present specification at the time of filing of the present application.

In addition, the same reference numbers or reference numerals in each drawing in the present specification indicate parts or components that perform substantially the same functions.

In addition, the terms used herein are used to describe the embodiments, and are not intended to limit and/or limit the disclosed invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In this specification, terms such as "comprises" or "have" are intended to designate that the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist, but one or more other features It does not preclude the possibility of the presence or addition of figures, numbers, steps, operations, components, parts, or combinations thereof.

In addition, terms including ordinal numbers such as “first” and “second” used in this specification may be used to describe various components, but the components are not limited by the terms, and the terms are It is used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. The term “and/or” includes any combination of a plurality of related listed items or any of a plurality of related listed items.

On the other hand, terms such as "front", "rear", "upper" and "lower" used in the following description are defined based on the drawings, and the shape and position of each component is not limited by these terms .

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic side cross-sectional view of a dishwasher according to an embodiment of the present invention. FIG. 2 is a perspective view of a first arm assembly of the dishwasher shown in FIG. 1 ;

1 to 2 , the dishwasher 1 may include a body 10 that forms an exterior. The dishwasher 1 may include a tub 12 provided inside the main body 10 . The tub 12 may be provided in a substantially box shape. The front of the tub 12 may be open. That is, the front surface of the tub 12 may correspond to the open portion 12a.

The dishwasher 1 may include a door 11 provided to open and close the opening 12a of the tub 12 . In the door 11 , an upper or lower portion of the door 11 may be hinged to the main body 10 to open and close the opening 12a of the tub 12 . The present invention is not limited thereto, and the side of the door 11 may be hinged to the body 10 so as to open and close the opening 12a of the tub 12 . Also, the door 11 may be installed in the tub 12 by an opening and closing structure other than a hinge.

The dishwasher 1 may further include a storage container provided inside the tub 12 to accommodate the dishes. The storage container may include a plurality of

baskets

51 , 52 , 53 .

The plurality of

baskets

51 , 52 , 53 may be arranged in the vertical direction Z of the dishwasher 1 , and in order from bottom to top, a lower basket 51 , an intermediate basket 52 , and an upper basket 53 . may apply to The lower basket 51 may be provided to be supported by the lower guide rack 13b, and the intermediate basket 52 may be provided to be supported by the intermediate guide rack 13a. The upper basket 53 is formed in the form of a rack assembly, so that dishes having a relatively small volume can be accommodated therein. The intermediate guide rack 13a and the lower guide rack 13b may be installed on the side surfaces of the tub 12 to be slidable in the front-rear direction X toward the opening 12a of the tub 12 .

However, the present invention is not limited thereto, and the upper basket 53 may not be included depending on the size of the tub 12 . Accordingly, the receiving container may include only the middle basket 52 and the lower basket 51 .

The dishwasher 1 may include a sump 300 for storing washing water. The dishwasher 1 may include a washing chamber C that is a space formed by the inside of the tub 12 .

The washing chamber (C) is a space in which dishes mounted on the

baskets

51, 52, and 53 can be washed and dried by washing water. The washing chamber C may be defined as an inner space of the tub 12 formed by the sump 300 communicating with both sides, the rear surface, the lower surface 12b, and the lower surface of the tub 12 . The washing water circulated in the washing chamber (C) may be provided so as not to flow out of the washing chamber (C) through the configuration other than the sump (300).

The dishwasher 1 includes a plurality of

arm assemblies

100 , 42 , 43 provided to spray washing water toward the

baskets

51 , 52 , 53 to wash dishes stored in the

baskets

51 , 52 , and 53 . can do. The

arm assemblies

100 , 42 , and 43 are arranged in the vertical direction Z of the dishwasher 1 , and in order from bottom to top, the first arm assembly 100 , the second arm assembly 42 , and the third arm assembly (43) may apply. The first arm assembly 100 may be disposed under the lower basket 51 , the second arm assembly 42 may be disposed under the intermediate basket 52 , and the third arm assembly 43 may be disposed at the upper portion It may be disposed on the upper portion of the basket 53 .

However, the present invention is not limited thereto. For example, the second arm assembly 42 may be provided above the intermediate basket 52 . In addition, when the upper basket 53 is omitted, the third arm assembly 43 may be provided above the intermediate basket 52 .

The first arm assembly 100 may be provided to be rotatable about the rotation shaft 100a, the second arm assembly 42 may be provided to be rotatable about the rotation shaft 42a, and the third arm assembly (43) may be provided to be rotatable about the rotation shaft (43a).

Unlike the second arm assembly 42 and the third arm assembly 43 , the first arm assembly 100 may be fixed to one side of the sump 300 and disposed on the lower surface 12b of the tub 12 .

The dishwasher 1 may include a circulation pump 30 that pumps the washing water stored in the sump 300 or the washing water flowing into the dishwasher 1 from the outside to the

arm assemblies

100 , 42 , and 43 . The washing water pumped by the circulation pump 30 is supplied to the first arm assembly 100 through the alternating device 200 connected to the circulation pump 30 or is moved upward by the duct 60 to the second arm assembly (42) or the third arm assembly (43).

The alternating device 200 may provide washing water to the first arm assembly 100 through the connector 400 connected to the first arm assembly 100 , and through the flow path 62 connected to the duct 60 . The duct 60 may provide washing water.

The dishwasher 1 may include a connector 400 connecting the alternating device 200 and the first arm assembly 100 . One end of the connector 400 may communicate with the alternating device 200 , and the other end of the connector 400 may communicate with the first arm assembly 100 . Therefore, as described above, the washing water pumped through the circulation pump 30 flows into the alternating device 200 , and the washing water moved to the connector 400 by the alternating device 200 moves the first arm assembly 100 . It can be sprayed to the lower basket 51 through the.

However, the present invention is not limited thereto, and the circulation pump 30 is directly connected to the connector 400 so that the washing water pumped from the circulation pump 30 is directly connected to the first arm through the connector 400 without going through the alternating device 200 . may be introduced into the assembly 100 . In this case, the dishwasher 1 may not include the alternating device 200 .

The dishwasher 1 may include a drain hose (not shown) provided to drain the washing water remaining inside the tub 12 . The drain hose is connected to the sump 300 to drain the washing water stored in the sump 300 to the outside of the dishwasher 1 .

As described above, the washing water collected in the sump 300 may be purified by a filter (not shown) inside the sump 300 and circulated back into the washing chamber C by the circulation pump 30 .

In the machine room L formed under the dishwasher 1 , the above-described configuration such as the circulation pump 30 , the alternating device 200 , and the sump 300 may be disposed.

3 is an exploded perspective view of the first arm assembly shown in FIG. 2 . 4 is a bottom exploded perspective view of the first arm assembly shown in FIG. 2 . FIG. 5 is an exploded perspective view of a first rotation guide of the first arm assembly shown in FIG. 2 . 6 is a side cross-sectional view illustrating a lower portion of the dishwasher shown in FIG. 1 . FIG. 7 is an enlarged view illustrating an enlarged portion A of FIG. 6 .

Hereinafter, the first arm assembly 100 will be described in detail. Hereinafter, the arm assembly refers to the first arm assembly 100 . However, the present invention is not limited thereto, and the second arm assembly 42 . It can also be applied to the third arm assembly 43 .

3 to 7 , the arm assembly 100 may spray washing water toward the lower basket 51 to wash dishes stored in the lower basket 51 . The arm assembly 100 may receive the washing water pumped by the circulation pump 30 from the connector 400 . A part of the arm assembly 100 may be inserted into the connector 400 and rotatably coupled thereto. Specifically, the arm assembly 100 may be rotatably coupled to one end of the connector 400 by a rotation guide 140 to be described later.

The arm assembly 100 may include a first spray arm 110 and a second spray arm 120 that are arranged in the vertical direction (Z). Each of the first spray arm 110 and the second spray arm 120 may have a two-blade propeller shape extending symmetrically in the radial direction with respect to the axis of rotation.

Internal spaces

110a and 120a are formed inside the first spray arm 110 and the second spray arm 120 so that washing water can flow.

The first spray arm 110 and the second spray arm 120 may communicate with each other. Specifically, the first spray arm 110 may be provided under the second spray arm 120 and rotatably coupled to the connector 400 , and the second spray arm 120 is the first spray arm 110 . It may be provided rotatably on the upper portion of the first spray arm 110, the inner space (110a) of the second spray arm (120) of the inner space (120a) is directly connected to the second spray arm (120) The washing water may be supplied from the first spray arm 110 .

More specifically, the first spray arm 110 may include a discharge unit 112 that protrudes upward from the upper surface of the first spray arm 110 and discharges washing water into the second spray arm 120 . . The second spray arm 120 protrudes downward from the lower surface of the second spray arm 120 to correspond to the discharge part 112 of the first spray arm 110 , and the discharge part 112 of the first spray arm 110 . ) may include a protrusion 121 forming a supply port 121b to receive the washing water discharged from. When the second spray arm 120 is coupled to the first spray arm 110 , the discharge part 112 of the first spray arm 110 is discharged through the supply port 121b of the second spray arm 120 . 2 It may be inserted into the protrusion 121 of the spray arm 120 .

The second spray arm 120 may be rotatably coupled to the upper portion of the first spray arm 110 . Specifically, the second spray arm 120 may be rotatably coupled to the upper portion of the first spray arm 110 by a rotation guide 130 to be described later, and the second spray arm 120 is the first spray arm. It can rotate independently of the rotation of (110).

The

spray arms

110 and 120 may include a plurality of

spray holes

110b and 120b through which washing water is sprayed. The washing water sprayed from the spray holes 110b and 120b may be sprayed toward the lower basket 51 .

The

spray arms

110 and 120 may include

propulsion holes

110c and 120c formed at one end to obtain a rotational force for rotation. One or

more propulsion holes

110c and 120c may be provided. The

spray arms

110 and 120 may receive a rotational force in a direction opposite to the spraying direction of the washing water sprayed from the propulsion holes 110c and 120c, and may be rotated by the rotational force.

The first spray arm 110 and the second spray arm ( 120) may rotate in opposite directions. However, the present invention is not limited thereto, and the first spray arm 110 and the second spray arm 120 may rotate in the same direction.

The arm assembly 100 may include rotation guides 130 and 140 provided to guide the rotation of the

spray arms

110 and 120 and to smoothly rotate the

spray arms

110 and 120 . A plurality of rotation guides 130 and 140 may be provided. The rotation guides 130 and 140 may include a first rotation guide 130 mounted on a lower portion of the second spray arm 120 , and a second rotation guide 140 mounted on a lower portion of the first spray arm 110 . The rotation guides 130 and 140 may correspond to a type of radial ball bearing.

The first rotation guide 130 may rotatably couple the second spray arm 120 to one side of the first spray arm 110 . Specifically, the first rotation guide 130 may rotatably couple the second spray arm 120 to the upper portion of the first spray arm 110 .

The first rotation guide 130 may include a first outer ring frame 131 , a first inner ring frame 132 , and a plurality of balls 133 .

The first inner ring frame 132 may be coupled to the protrusion of the second spray arm 120 . Specifically, the protrusion 121 of the second spray arm 120 may be inserted into the first inner ring frame 132 , and the outer surface of the protrusion 121 and the inner surface of the first inner ring frame 132 may be in contact. have.

The second spray arm 120 may include a fixing groove 121a formed on the outer surface of the protrusion 121 , and the first inner ring frame 132 may correspond to the fixing groove 121a formed in the protrusion 121 . It may include a fixing protrusion 132a formed on the inner diameter surface. By inserting the fixing protrusion 132a into the fixing groove 121a, the first inner ring frame 132 may be fixed to the outside of the protrusion 121 .

The first outer ring frame 131 may be coupled to the mounting portion 113 of the first spray arm 110 . Specifically, the first spray arm 110 may include a mounting portion 113 into which the first outer ring frame 131 is inserted and coupled. The mounting part 113 may be formed to protrude upward from the top surface of the first spray arm 110 , and the mounting part 113 protruding upward from the top surface of the first spray arm 110 is mounted with an upwardly open inside. space may be included. The first outer ring frame 131 may be inserted into the mounting space so that the outer diameter surface of the first outer ring frame 131 and the inner surface of the mounting part 113 are in contact with the first spray arm 110 .

The first spray arm 110 may include a fixing groove 113a formed in the mounting part 113 , and the first outer ring frame 131 has an outer diameter to correspond to the fixing groove 113a formed in the mounting part 113 . It may include a fixing protrusion (131a) formed on the. By inserting the fixing protrusion 131a into the fixing groove 113a , the first outer ring frame 131 may be fixed to the inside of the mounting part 113 .

On the other hand, the discharge part 112 and the mounting part 113 of the first spray arm 110 may have a ring shape, the diameter of the discharge part 112 is smaller than the diameter of the mounting part 113, the discharge part 112 ) may be disposed on the inside of the mounting part 113 . Accordingly, when the first spray arm 110 and the second spray arm 120 are coupled, the protrusion 121 may be disposed between the discharge part 112 and the mounting part 113 .

However, the present invention is not limited thereto. The mounting part 113 and the discharge part 112 may be provided in the second spray arm 120 , and the protrusion 121 may be provided in the first spray arm 110 . That is, the outer ring frame 131 of the first rotation guide 130 may be coupled to the second spray arm 120 , and the inner ring frame 132 may be coupled to the first spray arm 110 .

The plurality of balls 133 may be disposed between the first outer ring frame 131 and the first inner ring frame 132 to guide rotation of the first outer ring frame 131 and the first inner ring frame 132 . In other words, the plurality of balls 133 may guide the rotation of the first spray arm 110 and the second spray arm 120 .

Specifically, the first rotation guide 130 is a ring-shaped first inner ring frame 132 having a relatively smaller diameter inside the ring-shaped first outer ring frame 132 is inserted, the first outer ring frame 131 ) and the first inner ring frame 132 may be spaced apart.

Grooves

131b and 132b may be formed on the inner diameter surface of the first outer ring frame 131 and the outer diameter surface of the first inner ring frame 132 , respectively, and the grooves 132b and the first inner ring frame 132 of the first inner ring frame 132 . 1 An accommodation space in which a plurality of balls can be accommodated may be formed by the groove 131b of the outer ring frame 131 .

The first outer ring frame 131 and the first inner ring frame 132 may be connected by a plurality of balls 133 . The first outer ring frame 131 and the first inner ring frame 132 may be rotatably connected by a plurality of balls 133 . In other words, the first spray arm 110 connected to the first outer ring frame 131 and the second spray arm 120 connected to the first inner ring frame 132 may be connected by a plurality of balls 133 .

The first outer ring frame 131 and the first inner ring frame 132 may rotate independently of each other's rotation, respectively. Accordingly, the first outer ring frame 131 fixed to the first spray arm 110 may rotate together with the first spray arm 110 , and the first inner ring frame 132 fixed to the second spray arm 120 . ) may rotate together with the second spray arm 120 .

At this time, the central axis of the protrusion 121 of the second spray arm 120 , which may have a ring shape, and the discharge part 112 of the first spray arm 110 , may coincide with each other, and the The central axis of the protrusion 121 and the discharge unit 112 of the first spray arm 110 may correspond to a rotation axis of the second spray arm 120 .

The first rotation guide 130 may include a support frame 134 for supporting the plurality of balls 133 such that the plurality of balls 133 are disposed to be spaced apart from each other at regular intervals. The support frame 134 may be provided with a plurality of support grooves 134a corresponding to the balls 133 , and the balls 133 are inserted and supported in the support grooves 134a to accommodate the plurality of balls 133 . It can be prevented from being biased to one side within.

As such, due to the reduction of the contact area between the first outer ring frame 131 and the first inner ring frame 132 by the rolling motion of the plurality of balls 133 or the plurality of balls 133, the first outer ring frame 131 Energy loss due to friction between and the first inner ring frame 132 can be reduced, and the rotation can be smoothed. In addition, the first spray arm 110 and the second spray arm 120 coupled to the first outer ring frame 131 and the first inner ring frame 132, respectively, also rotate at a higher speed without being affected by each other's rotation. can do. When the rotational speed of the

spray arms

110 and 120 is increased, the number of times the washing water is sprayed to a specific area of the washing chamber C per unit time increases, so that washing efficiency can be improved.

The second rotation guide 140 may rotatably couple the first spray arm 110 to one side of the connector 400 . Specifically, the second rotation guide 140 may be rotatably coupled to the first spray arm 110 on the connector 400 .

The second rotation guide 140 may include a second outer ring frame 141 , a second inner ring frame 142 , and a plurality of balls 143 .

The first spray arm 110 may include an inlet 111 that is inserted into the connector 400 , is rotatably coupled to the connector 400 , and receives wash water from the connector 400 . The second inner ring frame 142 may be coupled to the inlet 111 of the first spray arm 110 . Specifically, the inlet 111 of the first spray arm 110 may be inserted into the second inner ring frame 142 , and the outer surface of the inlet 111 and the inner diameter surface of the second inner ring frame 142 are in contact with each other. can be

The first spray arm 110 may include a fixing groove 111a formed on the outer surface of the inlet 111 , and the second inner ring frame 142 corresponds to the fixing groove 111a formed in the inlet 111 . It may include a fixing protrusion 142a formed on the inner diameter surface as possible. By inserting the fixing protrusion 142a into the fixing groove 111a, the second inner ring frame 142 may be fixed to the outside of the inlet 111 .

The second outer ring frame 141 may be coupled to the connector 400 . Specifically, the connector 400 may include a fixing frame 410 coupled to the second outer ring frame 141 to support the first spray arm 110 . The connector 400 may include a fixing groove 410a formed in the fixing frame 410 , and the second outer ring frame 141 has a fixing protrusion 141a corresponding to the fixing groove 410a of the connector 400 . may include. By inserting the fixing protrusion 141a into the fixing groove 410a, the second outer ring frame 141 may be fixed to the fixing frame 410 .

However, the present invention is not limited thereto. The second outer ring frame 141 of the second rotation guide 140 may be inserted and fixed inside the inlet 111 of the first spray arm 110 , and one end of the connector 400 is the second inner ring frame. It may be inserted into the interior of the 142 and fixed.

The central axis of the inlet 111 of the first spray arm 110 may correspond to the rotation axis of the first spray arm 110 , and the central axis and the second axis of the discharge unit 112 of the first spray arm 110 . It may coincide with the central axis of the protrusion 121 of the spray arm 120 . That is, the first spray arm 110 and the second spray arm 120 may be coupled to be coaxially rotated on the same axis of rotation.

The second rotation guide 140 may include a support frame 144 for supporting the plurality of balls 143 so that the plurality of balls 143 are spaced apart from each other at regular intervals.

As such, due to the reduction of the contact area between the second outer ring frame 141 and the second inner ring frame 142 by the rolling motion of the plurality of balls 143 or the plurality of balls 143, the second outer ring frame 141 Energy loss due to friction between the and the second inner ring frame 142 can be reduced, and the rotation can be smoothed. In addition, the first spray arm 110 coupled to the second rotation guide 140 may also rotate at a higher speed. When the rotation speed of the spray arm 110 increases, the number of times that washing water is sprayed to a specific area of the washing chamber C per unit time increases, so that the washing efficiency of the dishwasher 1 can be improved. Furthermore, since the first rotation guide 130 and the second rotation guide 140 may have the same shape, only one type of rotation guide is used to manufacture the arm assembly 100 , thereby reducing the manufacturing process and cost.

FIG. 8 is a perspective view illustrating a first arm assembly of another embodiment of the dishwasher shown in FIG. 1 . 9 is a view illustrating a state in which one end of the first arm assembly shown in FIG. 8 is viewed from the front. FIG. 10 is a perspective view illustrating a first arm assembly of another embodiment of the dishwasher shown in FIG. 1 . 11 is a view illustrating a state in which part B shown in FIG. 10 is viewed in the extension direction of the spray arm.

A description of the content overlapping with the above-described content will be omitted. The description of the overlapping portions of the arm assembly 150 shown in FIG. 8 and the arm assembly 160 shown in FIG. 10 may be applied to both. 8 to 11 are views illustrating a state in which the first spray arm and the second spray arm are overlapped in parallel.

8 to 11 , the

second spray arms

150 and 160 may include

striking surfaces

150s and 160s that are hit by the washing water sprayed from the first spray arm 110 . The striking surfaces 150s and 160s may be formed on one or both lower ends of the

second spray arms

150 and 160 , and may form a part of a lower surface of the

second spray arms

150 and 160 .

As the

second spray arms

150 and 160 pass over the first spray arms 110, the striking surfaces of the second spray arms 150 and 160 ( When 150s and 160s) are hit, the

second spray arms

150 and 160 may be accelerated in a rotational direction by the washing water sprayed from the propulsion hole (not shown). That is, when the washing water sprayed from the injection hole 110b of the first spray arm 110 collides with the

striking surfaces

150s and 160s of the

second spray arms

150 and 160, a portion of the momentum of the washing water is transferred to the second spray The

second spray arms

150 and 160 that may be transferred to the

arms

150 and 160 and are being rotated by the washing water sprayed from the propulsion hole may be accelerated in the original rotation direction.

As shown in FIG. 9 , the striking surface 150s of the second spray arm 150 may have an inclined inclination as it extends in the radial direction of the second spray arm 150 . However, the present invention is not limited thereto, and as shown in FIG. 11 , the striking surface 160s of the second spray arm 160 may have an inclination that is inclined as it extends in the rotational direction of the second spray arm 160 . The striking surface 160s as shown in FIG. 11 is the second spray arm when the second spray arm 160 rotates counterclockwise when looking at the second spray arm 160 from above the second spray arm 160 . (160) can be accelerated counterclockwise. That is, the striking surface 160s as shown in FIG. 11 may have an inclination such that it gradually extends from a higher position to a lower position as it extends in the rotational direction of the second spray arm 160 .

As another example, the striking surface of the second spray arm is the same as in FIG. 9 when viewed in a direction perpendicular to the extending direction of the second spray arm, and inclined as shown in FIG. 11 when viewed in the extending direction of the second spray arm. can have However, the present invention is not limited thereto, and may include a striking surface of a different shape not shown in the drawings.

Washing water hitting the

striking surfaces

150s and 160s may be vertically sprayed from the injection hole 110b of the first spray arm 110, but is not limited thereto. The first spray arm 110 may be sprayed while being inclined at a predetermined angle with respect to the direction Z perpendicular to the upper surface of the spray arm 110 .

In this way, the washing water sprayed from the spray hole 110b of the first spray arm 110 accelerates the rotational speed of the

second spray arms

150 and 160 passing over the first spray arm 110 to thereby accelerate the second spray arms 150 and 160. ) may increase the rotation speed, and the washing efficiency of the dishwasher 1 may be increased.

In the above, specific embodiments have been shown and described. However, it is not limited only to the above-described embodiments, and those of ordinary skill in the art to which the invention pertains can make various changes without departing from the spirit of the invention described in the claims below. .

Claims

a basket in which dishes are stored;

Including; an arm assembly that sprays washing water to wash dishes in the basket;

the arm assembly

A first spray arm rotatably provided, comprising: a first spray arm including a discharge part provided to discharge washing water and a mounting part formed on an upper surface of the first spray arm to surround the discharge part;

a second spray arm rotatably provided on the first spray arm and supplied with the washing water discharged from the discharge unit; and

A plurality of balls for guiding rotation of the first spray arm and the second spray arm as a rotation guide inserted into and fixed to the mounting part so that one side is coupled to the first spray arm and the other side is coupled to the second spray arm. A dishwasher comprising a; rotation guide comprising a.
According to claim 1,

The rotation guide is

an outer ring frame coupled to the first spray arm;

an inner ring frame coupled to the second spray arm;

the plurality of balls

A dishwasher disposed between the outer ring frame and the inner ring frame.
3. The method of claim 2,

The outer ring frame and the inner ring frame form an accommodation space that can accommodate the plurality of balls,

The plurality of balls inserted into the accommodating space come into contact with the outer ring frame and the inner ring frame, and perform rolling motion.
3. The method of claim 2,

The second spray arm is

It includes a protrusion that is inserted into the inner ring frame,

The outer ring frame is inserted and fixed to the mounting portion, and the protrusion portion is inserted and fixed to the inner ring frame.
5. The method of claim 4,

The first spray arm includes a first fixing groove formed in the mounting portion,

The second spray arm includes a second fixing groove formed in the protrusion,

The outer ring frame includes a first fixing protrusion corresponding to the first fixing groove,

The inner ring frame includes a second fixing protrusion corresponding to the second fixing groove.
6. The method of claim 5,

The first spray arm and the second spray arm rotate in different directions,

The outer ring frame is fixed to the first spray arm and rotates together with the first spray arm, and the inner ring frame is fixed to the second spray arm and rotates together with the second spray arm.
5. The method of claim 4,

The second spray arm is

and a supply port formed by the protrusion and corresponding to the discharge unit to receive washing water from the first spray arm.
3. The method of claim 2,

a circulation pump that pumps wash water to the arm assembly; and

a connector for supplying the washing water pumped by the circulation pump to the arm assembly;

the arm assembly

A dishwasher rotatably coupled to the connector.
9. The method of claim 8,

The rotation guide is a first rotation guide,

the arm assembly

The dishwasher further comprising a; second rotation guide for rotatably coupling the first spray arm to one side of the connector.
10. The method of claim 9,

The outer ring frame and the inner ring frame are a first outer ring frame and a first inner ring frame, respectively,

The second rotation guide is

a second outer ring frame coupled to the connector;

and a second inner ring frame coupled to the first spray arm.
11. The method of claim 10,

The first spray arm is

It is coupled to the second rotation guide and includes an inlet through which wash water is introduced,

The second outer ring frame is fixed to the connector, and the inlet portion is inserted into and fixed to the second inner ring frame.
12. The method of claim 11,

The connector includes a first fixing groove,

The first spray arm includes a second fixing groove formed in the inlet,

The second outer ring frame includes a first fixing protrusion corresponding to the first fixing groove,

The second inner ring frame includes a second fixing protrusion corresponding to the second fixing groove.
According to claim 1,

The first spray arm is

and a spray hole for spraying washing water toward the basket;

The second spray arm is

The dishwasher is provided to be hit by the washing water sprayed from the spray hole, and includes a striking surface inclined in a radial direction of the second spray arm.
According to claim 1,

The first spray arm is

and a spray hole for spraying washing water toward the basket;

The second spray arm is

and a striking surface provided to be hit by the washing water sprayed from the spray hole and inclined in the rotational direction of the second spray arm.
4. The method of claim 3,

The rotation guide is

The dishwasher further comprising a support frame for supporting the plurality of balls so that the plurality of balls are spaced apart from each other.