CN110859566A

CN110859566A - Spray arm assembly and washing electric appliance with same

Info

Publication number: CN110859566A
Application number: CN201810989072.1A
Authority: CN
Inventors: 赵利铭; 蔡思琦; 费望春
Original assignee: Midea Group Co Ltd; Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd
Current assignee: Midea Group Co Ltd; Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd
Priority date: 2018-08-28
Filing date: 2018-08-28
Publication date: 2020-03-06

Abstract

The invention discloses a spray arm assembly and a washing appliance with the same. This spray arm subassembly includes: the spray arm, the spray arm includes: the upper spray arm is connected with the lower spray arm and positioned above the lower spray arm, the upper spray arm can rotate relative to the lower spray arm, and a first ball assembly is arranged at the connection matching position of the upper spray arm and the lower spray arm; the spray arm seat is connected with the spray arm seat, and the spray arm can rotate relative to the spray arm seat; and the second ball assembly is arranged at the connection and matching position of the spray arm and the spray arm seat. According to the spray arm assembly, the cleaning effect is good, and the friction between the upper spray arm and the lower spray arm and between the spray arm and the spray arm seat is small, so that the rotation stability of the spray arm is improved.

Description

Spray arm assembly and washing electric appliance with same

Technical Field

The invention relates to the field of household appliances, in particular to a spray arm assembly and a washing appliance with the same.

Background

Present washing electrical apparatus spray arm produces easily in the cleaning process and washs the dead angle, use dish washer as an example, the position design of the bowl basket of dish washer and spray arm all is the cooperation, the design of current bowl basket is many according to the standard tableware design in china domestic market, when the consumer is in the in-service use of own family, if the size of tableware, the locating place, the direction is different with putting with the tableware size of standard, then lead to dish washer not clean at the during operation easily, produce the user pain point. Some dish washers adopt a satellite spray arm or a Waterwall (water wall) in order to improve the cleaning capacity, but the satellite spray arm or the Waterwall has a complex structure and high cost, and is not beneficial to popularization and application.

In addition, the main mode that spray arm and spray arm seat are connected is through joint flange and buckle cooperation, but this kind of connected mode can lead to the spray arm and spray arm seat between the clearance great, and when dishwasher during operation, water in the spray arm is revealed through this gap easily, influences the cleaning performance. In addition, when the spray arm and the spray arm seat generate relative motion, the friction mode between the spray arm and the spray arm seat is sliding friction, and therefore the lost hydrodynamic force is large. On the other hand, the buckle connection mode directly leads to the upper and lower height dimension of spouting arm seat and spouting arm great, has wasted the inner bag space of washing electrical apparatus like this, has reduced the inside space of putting of treating the washing piece of washing electrical apparatus.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the above-mentioned problems in the prior art. Therefore, the invention provides a spray arm assembly which can reduce the friction force in the spray arm and the friction force between the spray arm and a spray arm seat.

The invention also provides a washing electric appliance with the spray arm assembly.

The spray arm assembly according to an embodiment of the present invention includes: a spray arm, the spray arm comprising: the upper spray arm is connected with the lower spray arm and is positioned above the lower spray arm, the upper spray arm can rotate relative to the lower spray arm, and a first ball assembly is arranged at the connection matching position of the upper spray arm and the lower spray arm; the spray arm is connected with the spray arm seat, and the spray arm can rotate relative to the spray arm seat; and the second ball assembly is arranged at the connecting and matching part of the spray arm and the spray arm seat.

According to the spray arm assembly provided by the embodiment of the invention, the number of the spray arms is increased by arranging the lower spray arm and the upper spray arm, so that the cleaning effect of the spray arms on tableware is favorably enhanced, and in addition, the first ball assembly is arranged between the upper spray arm and the lower spray arm, so that the upper spray arm and the lower spray arm are in rolling contact, and therefore, the friction force between the upper spray arm and the lower spray arm can be reduced, the hydrodynamic loss is favorably reduced, the hydrodynamic utilization rate is improved, and the cleaning effect of a washing appliance on a piece to be cleaned is favorably improved. Simultaneously, go up the spray arm and be connected through first ball subassembly between the spray arm down, can effectively reduce the height dimension of spray arm. In addition, through set up the second ball subassembly between spray arm and spray arm seat, make and be rolling contact between spray arm and the spray arm seat, can reduce the frictional force between spray arm and the spray arm seat from this, thereby be favorable to further reducing the hydrodynamic loss, promote the cleaning effect that washing electrical apparatus treated the washing piece, can effectively reduce the height dimension of spray arm subassembly simultaneously, thereby washing electrical apparatus inner space has been saved, more spaces have been left for treating putting of washing piece, the capacity of washing electrical apparatus has been promoted.

According to some embodiments of the invention, the lower spray arm comprises: spout the arm and go up adapter sleeve, spout the arm body down, it sets up to spout the arm on the arm down the upside of spouting the arm body down, it includes to go up the spray arm: go up spray arm body and spray arm adapter sleeve, it sets up to go up spray arm adapter sleeve the downside of spray arm body, first ball subassembly sets up spray arm adapter sleeve with the connection cooperation department of adapter sleeve on the spray arm down.

According to some embodiments of the invention, each of the first and second ball assemblies comprises at least: the ball of the first ball assembly is arranged at the connection and matching position of the upper spray arm connecting sleeve and the lower spray arm upper connecting sleeve, and the ball of the second ball assembly is arranged at the connection and matching position of the lower spray arm and the spray arm seat.

Further, the first ball assembly and the second ball assembly each further comprise: the ball bearing structure comprises an intermediate sleeve, wherein a plurality of ball holes are formed in the intermediate sleeve, balls are installed in the ball holes, and the balls protrude from the inner circumferential surface and the outer circumferential surface of the intermediate sleeve in the radial direction of the intermediate sleeve.

Optionally, each of the first and second ball assemblies further comprises:

the inner sleeve is arranged on the inner side of the ball, and an inner sleeve ball groove suitable for being matched with the ball is formed in the outer peripheral surface of the inner sleeve.

Further, the first ball assembly and the second ball assembly each further comprise: the outer sleeve is arranged on the outer side of the ball, and an outer sleeve ball groove suitable for being matched with the ball is formed in the inner circumferential surface of the outer sleeve.

According to some embodiments of the invention, each of the first and second ball assemblies further comprises: the outer sleeve is arranged on the outer side of the ball, and an outer sleeve ball groove suitable for being matched with the ball is formed in the inner circumferential surface of the outer sleeve.

According to some embodiments of the invention, the lower spray arm is detachably connected with the upper spray arm.

Optionally, the top of the upper connecting sleeve of the lower spray arm is provided with a lower spray arm buckle, and the lower spray arm buckle is suitable for being clamped on the upper surface of the inner sleeve of the first ball assembly.

Optionally, the inner sleeve of the first ball assembly has inner sleeve threads, the lower spray arm upper connection sleeve has lower spray arm upper threads, and the lower spray arm upper threads are in threaded connection with the inner sleeve threads.

According to some embodiments of the invention, the upper connecting sleeve of the lower spray arm and the inner sleeve of the first ball assembly are in interference fit.

According to some embodiments of the invention, the upper spray arm connecting sleeve and the outer sleeve of the first ball assembly are in interference fit; or

The outer sleeve of the first ball assembly is provided with outer sleeve threads, the upper spray arm connecting sleeve is provided with upper spray arm threads, and the upper spray arm threads are in threaded connection with the outer sleeve threads.

According to some embodiments of the invention, the lower spray arm is detachably connected to the spray arm base.

Optionally, the spray arm seat includes: the spray arm seat comprises a spray arm seat body, wherein a spray arm seat buckle is arranged at the top of the spray arm seat body and is suitable for being clamped at the top end of the inner sleeve of the second ball assembly.

Optionally, the inner sleeve of the second ball assembly has an inner sleeve thread and the spray arm socket has a spray arm socket thread that threadably engages the inner sleeve thread.

According to some embodiments of the invention, the spray arm socket is an interference fit with the inner sleeve of the second ball assembly.

According to some embodiments of the invention, the lower spray arm lower connecting sleeve and the outer sleeve of the second ball assembly are in interference fit; or

The outer sleeve of the second ball assembly is provided with outer sleeve threads, the lower spray arm lower connecting sleeve is provided with lower spray arm lower threads, and the lower spray arm lower threads are in threaded connection with the outer sleeve threads.

According to some embodiments of the invention, the length of the upper spray arm body is 0.5 to 2 times the length of the lower spray arm body.

According to another aspect of the invention, a washing appliance comprises the spray arm assembly described above.

Drawings

Fig. 1 is a perspective view of a spray arm assembly according to a first embodiment of the present invention (the upper spray arm and the lower spray arm form an angle of 0 °);

fig. 2 is a perspective view of the spray arm assembly of the first embodiment of the present invention (the upper spray arm is 90 ° from the lower spray arm);

fig. 3 is a top view of the spray arm assembly of the first embodiment of the present invention (the upper spray arm is at an angle of 0 ° to the lower spray arm);

fig. 4 is a sectional view of a spray arm assembly according to a first embodiment of the present invention;

FIG. 5 is an enlarged view of a portion of FIG. 4 at A; FIG. 6 is an exploded view of the spray arm assembly;

FIG. 7 is an enlarged partial schematic view of FIG. 6 at B; FIG. 8 is an enlarged partial schematic view at C of FIG. 6;

FIG. 9 is a schematic view of a spray arm assembly of a second embodiment of the present invention;

fig. 10 is a schematic view of a spray arm assembly according to a third embodiment of the present invention;

FIG. 11 is a schematic view of a second drive projection; FIG. 12 is a schematic view of a first drive projection;

FIG. 13 is a schematic view of a first intermediate sleeve; FIG. 14 is a schematic view of a modified example of the first ball assembly;

fig. 15 is a schematic view illustrating a modification of the second ball assembly.

Reference numerals:

a spray arm assembly 1000; the upper spray arm comprises an upper spray arm 100, a second driving protrusion 110, a second driving hole 111, an upper spray arm body 120, an upper spray arm connecting sleeve 130, an upper spray arm ball groove 131, an upper chamber 140 and an upper water spray hole 160; the lower spray arm comprises a lower spray arm 200, a first driving protrusion 210, a first driving hole 211, a lower spray arm upper connecting sleeve 220, a lower spray arm body 230, a lower spray arm lower connecting sleeve 240, a connecting sleeve peripheral wall 241, a connecting sleeve bottom wall 242, a lower spray arm ball groove 243, a lower cavity 250, a lower spray hole 260, a lower spray arm buckle 270 and lower spray arm threads 280; the first ball assembly 300, the first outer sleeve 310, the first outer sleeve ball groove 313, the first inner sleeve 320, the first inner sleeve ball groove 321, the first ball 330, the first ball hole 350, the first ball taking and placing opening 351, the first weakening groove 360, the first weakening groove upright 361 and the first middle sleeve 370; a second ball assembly 400, a second outer sleeve 410, a second outer sleeve peripheral wall 411, a second outer sleeve bottom wall 412, a second outer sleeve ball groove 413, a second outer sleeve internal thread 414, a second outer sleeve external thread 415, a second inner sleeve 420, a second inner sleeve ball groove 421, a second inner sleeve external thread 422, a second ball 430, a second ball hole 450, a second ball taking and placing opening 451, a second weakening groove 460, a second weakening groove upright column 461, a second middle sleeve 470; spray arm seat 500, spray arm seat body 510, spray arm seat latch 511, spray arm seat flange 520, spray arm seat internal threads 530, spray arm seat water inlet shaft 540, spray arm seat ball groove 570, and spray arm seat chamber 580.

Detailed Description

Embodiments of the invention are described below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the present invention, unless otherwise specifically stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected or detachably connected or integrated. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The spray arm assembly 1000 according to an embodiment of the present invention will be described in detail with reference to fig. 1 to 15. The spray arm assembly 1000 may be used in a washing appliance, and the structure of the spray arm assembly 1000 will be described below by taking the example of the spray arm assembly 1000 being applied to a dishwasher.

Referring to fig. 1, a spray arm assembly 1000 according to an embodiment of the present invention may include: a spray arm, a first ball assembly 300, a spray arm socket 500, and a second ball assembly 400. Specifically, the spray arm may include: lower spray arm 200 and last spray arm 100, it links to each other with lower spray arm 200 to go up spray arm 100, and goes up spray arm 100 and be located the top of spray arm 200 down, it is rotatable for lower spray arm 200 to go up spray arm 100, upward be provided with the last hole for spraying water 160 in the dish washer on spray arm 100, be provided with down hole for spraying water 260 in the dish washer on the lower spray arm 200, when the water that from last hole for spraying water 160 and hole for spraying water 260 spun falls on the tableware, can play the cleaning action to the tableware. The upper spray arms 100 are arranged above the lower spray arms 200, so that the number of the spray arms is increased, the water spraying amount of the spray arms is increased, and the tableware cleaning effect of the spray arms is enhanced.

The lower spray arm 200 is provided with a first driving hole 211 for driving the lower spray arm 200 to rotate around a first direction, when a water column in the spray arm is sprayed out from the first driving hole 211, the lower spray arm 200 can receive a reaction force (namely, a reverse driving force) when the water column is sprayed out from the first driving hole 211, at the moment, the lower spray arm 200 can rotate around the first direction under the action of the reaction force, and the first direction is opposite to the opening direction of the first driving hole 211. The lower spray arm 200 can rotate continuously as the water column is continuously sprayed out from the first driving hole 211, the water column sprayed out from the first driving hole 211 can be sprayed to the periphery along with the rotation of the lower spray arm 200, the water flow sprayed out from the lower spray hole 260 of the lower spray arm 200 also enters the working area of the dishwasher, and the water column and the water flow are matched to wash tableware in the dishwasher or stains on the inner wall of the dishwasher.

The upper spray arm 100 is provided with a second driving hole 111 for driving the upper spray arm 100 to rotate around the second direction, when the water column is sprayed out from the second driving hole 111, the upper spray arm 100 can receive a reaction force when the water column is sprayed out from the second driving hole 111, at this moment, the upper spray arm 100 can rotate around the second direction under the action of the reaction force, and the second direction is opposite to the opening direction of the second driving hole 111. The upper spray arm 100 can rotate continuously as the water column is continuously sprayed from the second driving hole 111, and when the upper spray arm 100 rotates, the water column sprayed from the second driving hole 111 is sprayed to the periphery, the water stream sprayed from the upper spray hole 160 of the upper spray arm 100 also enters the working area of the dishwasher, and the upper spray arm 100 and the lower spray arm 200 cooperate to wash the tableware in the dishwasher or the dirt on the inner wall of the dishwasher.

It should be noted that when the first direction of rotation of the lower spray arm 200 is opposite to the second direction of rotation of the upper spray arm 100, and the water column is simultaneously sprayed from the first driving hole 211 of the lower spray arm 200 and the second driving hole 111 of the upper spray arm 100, the lower spray arm 200 and the upper spray arm 100 are simultaneously rotated in opposite directions (for example, referring to fig. 1 to 3, the lower spray arm 200 may be rotated counterclockwise, the upper spray arm 100 may be rotated clockwise, and the lower spray arm 200 may also be rotated clockwise, and the upper spray arm 100 may be rotated counterclockwise), at this time, the water column sprayed from the first driving hole 211 of the lower spray arm 200 and the second driving hole 111 of the upper spray arm 100 are sprayed in opposite directions, and when the water column sprayed from the first driving hole 211 and the second driving hole 111 simultaneously fall on the inner wall of the dish or the dish washing machine, the direction of the sprayed water column is not uniform after being applied to the inner wall of the dish or the dish washing machine, therefore, the water column sprayed from the first driving hole 211 and the second driving hole 111 generates a kneading force on the inner wall of the tableware or the dish washer, thereby enhancing the cleaning effect of the spray arm and ensuring that the inner wall of the tableware or the dish washer is cleaned. In addition, the upper spray arm 100 and the lower spray arm 200 rotate in opposite directions, so that the water sprayed from the upper spray holes 160 of the upper spray arm 100 and the water sprayed from the lower spray holes 260 of the lower spray arm 200 generate a kneading force on the dishes, thereby improving the washing effect of the spray arm.

The directions and positions of water columns sprayed on the tableware by the upper spray arm 100 and the lower spray arm 200 are multidirectional, dead corners are reduced, the tableware is easier to clean, and due to the fact that the coverage rate of water flow is large, the cleaning time is correspondingly reduced, namely the cleaning time is favorably shortened.

The first ball assembly 300 is arranged at the connection matching position of the upper spray arm 100 and the lower spray arm 200, the upper spray arm 100 and the lower spray arm 200 are indirectly connected through the first ball assembly 300, when the upper spray arm 100 rotates relative to the lower spray arm 200, the friction between the upper spray arm 100 and the lower spray arm 200 is rolling friction, which is not sliding friction before the rolling friction, so that the friction when the upper spray arm 100 rotates relative to the lower spray arm 200 is ensured to be smaller, namely the resistance of the rolling friction to the rotation of the spray arm is very small, the hydrodynamic loss caused by friction can be reduced, and the utilization rate of hydrodynamic force is improved. Meanwhile, the upper spray arm 100 rotates relatively to the lower spray arm 200 at a high speed, and the first ball assembly 300 is arranged, so that the smoothness of the upper spray arm 100 and the lower spray arm 200 during relative rotation is improved, and the noise of the dishwasher is reduced.

In addition, the first ball assembly 300 is arranged between the upper spray arm 100 and the lower spray arm 200, so as to connect the upper spray arm 100 and the lower spray arm 200 into a whole, compared with the original mode that the upper spray arm 100 and the lower spray arm 200 are connected through a buckle alone, the height of the joint of the upper spray arm 100 and the lower spray arm 200 can be effectively reduced, thereby reducing the height size of the spray arm, saving the internal space of the dishwasher, leaving more space for placing tableware, further improving the tableware capacity of the dishwasher, for example, the internal loading capacity of the dishwasher can be increased by 10mm-40 mm.

The spray arm links to each other with spray arm seat 500, and spray arm seat 500 is located the below of spray arm, and the spray arm is rotatable for spray arm seat 500, sprays arm seat 500 through the setting, provides the interface for being connected of spray arm and dish washer inner bag, and simultaneously, spray arm seat 500 can also act as the inlet channel who spouts the arm, and after the water source switch-on of dish washer, rivers flowed into the spray arm from spray arm seat 500. Specifically, the spray arm socket 500 is connected to the lower spray arm 200.

When the water pressure in the lower spray arm 200 reaches a certain value, the lower spray arm 200 starts to spray water columns through the lower spray holes 260 and the first driving holes 211, the lower spray arm 200 rotates around the first direction under the reaction force generated when the water columns are sprayed, when the water pressure in the upper spray arm 100 reaches a certain value, the upper spray arm 100 starts to spray the water columns through the upper spray holes 160 and the second driving holes 111, the upper spray arm 100 rotates around the second direction under the reaction force generated when the water columns are sprayed, the lower spray arm 200 and the upper spray arm 100 can continuously rotate along with the continuous spraying of the water columns from the spray holes and the driving holes, and the water columns sprayed from the spray holes and the driving holes can be sprayed to the surface of tableware or the inner wall of the dishwasher along with the rotation of the spray arm, so that the stain on the tableware or the inner wall of the dishwasher is washed, and the washing work of the dishwasher on the tableware is completed.

The second ball assembly 400 is disposed at the connection fitting portion of the spray arm and the spray arm base 500, as shown in fig. 4, the lower spray arm 200 and the spray arm base 500 are indirectly connected through the second ball assembly 400, when the spray arm rotates relative to the spray arm base 500, the friction form between the spray arm and the spray arm base 500 is rolling friction, which is no longer the previous sliding friction, so that the resistance of the rolling friction to the rotation of the spray arm is small, thereby reducing the hydrodynamic loss caused by friction and improving the utilization rate of hydrodynamic force. Meanwhile, the speed of the spray arm rotating relative to the spray arm seat 500 is high, and the second ball assembly 400 is arranged, so that the smoothness of the spray arm rotating is improved, and the noise of the dish washing machine is reduced.

In addition, the second ball assembly 400 is arranged between the spray arm and the spray arm seat 500, the spray arm and the spray arm seat 500 are connected into a whole, compared with the original mode that the spray arm and the spray arm seat 500 are connected through a buckle independently, the height of the joint of the spray arm and the spray arm seat 500 can be effectively reduced, so that the height size of the spray arm assembly 1000 is reduced, the internal space of the dish-washing machine is saved, more space is reserved for placing tableware, the tableware capacity of the dish-washing machine is further improved, and the internal loading capacity of the dish-washing machine can be increased by 10mm-40mm, for example.

According to the spray arm assembly 1000 of the embodiment of the invention, the lower spray arm 200 and the upper spray arm 100 are arranged, so that the number of the spray arms is increased, and the cleaning effect of the spray arms on tableware is enhanced, the lower spray arm 200 is provided with the first driving hole 211, and the upper spray arm 100 is provided with the second driving hole 111, so that the upper spray arm 100 can be ensured to rotate reversely relative to the lower spray arm 200, and thus water columns sprayed from the lower spray arm 200 and the upper spray arm 100 generate rubbing force on the tableware, the cleaning effect of the spray arms is enhanced, and the tableware can be ensured to be cleaned. In addition, the first ball assembly 300 is arranged between the upper spray arm 100 and the lower spray arm 200, so that the upper spray arm 100 and the lower spray arm 200 are in rolling contact, the friction force between the upper spray arm 100 and the lower spray arm 200 can be reduced, the hydrodynamic loss is reduced, the hydrodynamic utilization rate is improved, the water is sprayed out from the upper spray hole 160 and the lower spray hole 260 under high pressure, and the tableware cleaning effect of the dishwasher is improved. In addition, through setting up spray arm seat 500, a connection interface is provided for the spray arm, spray arm seat 500 still serves as the inlet channel of spray arm simultaneously, through set up second ball subassembly 400 between spray arm and spray arm seat 500, make and be rolling contact between spray arm and the spray arm seat 500, can reduce the frictional force between spray arm and the spray arm seat 500 from this, thereby be favorable to reducing the hydrodynamic loss, improve the utilization ratio of hydrodynamic force, guarantee that water is great from the pressure of spray arm hole for water spraying during blowout, be favorable to promoting the cleaning performance of dish washer to the tableware. Meanwhile, the upper spray arm 100 is connected with the lower spray arm 200 through the first ball assembly 300, and the spray arm is connected with the spray arm seat 500 through the second ball assembly 400, so that the height dimension of the spray arm assembly 1000 can be effectively reduced, the internal space of the dishwasher is saved, more space is reserved for placing tableware, and the tableware capacity of the dishwasher is improved.

In some embodiments of the present invention, the lower spray arm 200 may include: the upper connecting sleeve 220 of the lower spray arm, the lower spray arm body 230 and the lower connecting sleeve 240 of the lower spray arm, wherein the upper connecting sleeve 220 of the lower spray arm is arranged on the upper side of the lower spray arm body 230, so that the upper spray arm 100 and the lower spray arm 200 are conveniently connected, and the upper spray arm 100 and the lower spray arm 200 can be reliably connected into a whole. The lower spray arm lower connection sleeve 240 is arranged at the lower side of the lower spray arm body 230, which facilitates the fixation of the lower spray arm 200 and the spray arm base 500.

The upper connecting sleeve 220 of the lower spray arm, the lower spray arm body 230 and the lower connecting sleeve 240 of the lower spray arm are connected into a whole, and the upper connecting sleeve 220 of the lower spray arm and the lower connecting sleeve 240 of the lower spray arm are both positioned in the middle of the lower spray arm body 230, so that the balance of the spray arm is guaranteed. As shown in fig. 4-5, the lower spray arm upper connection sleeve 220, the lower spray arm body 230 and the lower spray arm lower connection sleeve 240 have a lower chamber 250 therein, the first driving hole 211 is communicated with the lower chamber 250, and the first driving hole 211 is communicated with the lower chamber 250. The upper connecting sleeve 220 of the lower spray arm, the lower spray arm body 230 and the lower connecting sleeve 240 of the lower spray arm may be hollow components, the hollow positions of the three components together form a lower chamber 250, and the first driving hole 211 is connected with the hollow position of the lower spray arm body 230, so that the first driving hole 211 is communicated with the lower chamber 250.

The spray arm seat 500 has a spray arm seat chamber 580, and the spray arm seat chamber 580 communicates with the lower chamber 250 to ensure that water in the spray arm seat 500 can enter the lower spray arm 200. Further, the upper spray arm 100 may include: go up spray arm body 120 and spray arm adapter sleeve 130, go up spray arm adapter sleeve 130 and set up the downside at last spray arm body 120, made things convenient for from this that to go up spray arm 100 and spray arm 200 to be connected down, guaranteed that go up spray arm 100 and spray arm 200 can be connected as an organic whole reliably.

The upper spray arm body 120 and the upper spray arm connecting sleeve 130 are internally provided with an upper chamber 140 which is communicated, the second driving hole 111 is communicated with the upper chamber 140, and the upper chamber 140 is also communicated with the lower chamber 250, so that water at a water source of the dish washing machine can be ensured to smoothly enter the upper chamber 140 through the spray arm seat chamber 580 and the lower chamber 250, and then the water is sprayed to the surface of tableware through the water spraying holes and the driving holes on the spray arms, thereby completing the operation of cleaning the tableware. As water continuously enters the upper chamber 140 and the lower chamber 250, the water pressure in the upper chamber 140 and the lower chamber 250 is higher and higher, and the reaction force generated by the water column sprayed from the first driving hole 211 and the second driving hole 111 is larger, so that the rotating speed of the upper spray arm 100 and the lower spray arm 200 is higher, and meanwhile, the force of the sprayed water column beating on the tableware is larger, so that the dirt on the tableware can be cleaned, therefore, by arranging the upper chamber 140 and the lower chamber 250, the water volume can be ensured to be sufficient, and the washing effect of the dishwasher is better.

The first ball assembly 300 is disposed at the connection fitting of the upper spray arm connecting sleeve 130 and the lower spray arm upper connecting sleeve 220, so that when the upper spray arm connecting sleeve 130 and the lower spray arm upper connecting sleeve 220 rotate relatively, the first ball assembly 300 can roll, thereby reducing the friction force between the upper spray arm connecting sleeve 130 and the lower spray arm upper connecting sleeve 220. Meanwhile, after the upper spray arm connecting sleeve 130 and the lower spray arm upper connecting sleeve 220 are connected by the first ball assembly 300, the height of the upper spray arm connecting sleeve 130 and the height of the lower spray arm upper connecting sleeve 220 can be reduced, so that the overall height of the spray arm is reduced, and more space is reserved for placing tableware.

In some embodiments of the present invention, each of the first ball assembly 300 and the second ball assembly 400 includes at least: a plurality of balls of the first ball assembly 300 are disposed at the connection and engagement portion of the upper spray arm connection sleeve 130 and the lower spray arm upper connection sleeve 220, and a plurality of balls of the second ball assembly 400 are disposed at the connection and engagement portion of the lower spray arm 200 and the spray arm base 500.

Further, each of the first ball assembly 300 and the second ball assembly 400 further includes: the middle sleeve is provided with a plurality of ball holes, the balls are installed in the ball holes, and the balls radially protrude out of the inner circumferential surface and the outer circumferential surface of the middle sleeve.

Optionally, each of the first ball assembly 300 and the second ball assembly 400 further comprises: the inner sleeve is arranged on the inner side of the ball, and an inner sleeve ball groove suitable for being matched with the ball is arranged on the outer peripheral surface of the inner sleeve.

Further, each of the first ball assembly 300 and the second ball assembly 400 further includes: the outer sleeve is arranged on the outer side of the ball, and an outer sleeve ball groove suitable for being matched with the ball is formed in the inner circumferential surface of the outer sleeve.

In the embodiment shown in fig. 4-8, either of the first ball assembly 300 and the second ball assembly 400 includes: the ball bearing device comprises an intermediate sleeve, balls and an inner sleeve, wherein a plurality of ball holes are formed in the intermediate sleeve, the balls are installed in the ball holes, the balls radially protrude out of the inner circumferential surface and the outer circumferential surface of the intermediate sleeve, the inner sleeve is arranged on the inner side of the intermediate sleeve, and an inner sleeve ball groove suitable for being matched with the balls is formed in the outer circumferential surface of the inner sleeve.

Optionally, the diameter of the ball is 3mm-8mm, the number of the balls in each ball assembly is 4-12, and preferably, the number of the balls in each ball assembly is even, so that the stress balance of each ball assembly can be ensured, and the stress concentration phenomenon can be relieved.

The structure of the first ball assembly 300 and the second ball assembly 400 will be described in detail with reference to fig. 4-8, and the structure will be described by taking the case that the upper spray arm connecting sleeve 130 is sleeved outside the upper lower spray arm connecting sleeve 220, and the lower spray arm connecting sleeve 240 is sleeved outside the spray arm base 500.

Specifically, as shown in fig. 5 to 7, the first ball assembly 300 includes: the first intermediate sleeve 370, the first balls 330 and the first inner sleeve 320, the first inner sleeve 320 is disposed inside the first intermediate sleeve 370, the first intermediate sleeve 370 is provided with a plurality of first ball holes 350, the first balls 330 are mounted in the first ball holes 350, the first ball holes 350 provide support for fixing the first balls 330, the relative positions of the first balls 330 are guaranteed to be unchanged, collision and extrusion among the first balls 330 are prevented, and therefore the working stability of the first ball assembly 300 can be improved.

The first ball 330 is in rolling contact with the inner surface of the upper spray arm connecting sleeve 130, the first ball 330 is in rolling contact with the outer surface of the first inner sleeve 320, at least one part of the lower spray arm upper connecting sleeve 220 is arranged inside the first inner sleeve 320, and the first inner sleeve 320 is fixedly connected with the lower spray arm upper connecting sleeve 220, so that the upper spray arm 100 and the lower spray arm 200 are indirectly connected through the first ball assembly 300, and the connection structure of the upper spray arm 100, the lower spray arm 200 and the first ball assembly 300 is simple and stable.

The first balls 330 protrude from the inner circumferential surface and the outer circumferential surface of the first intermediate sleeve 370 in the radial direction of the first intermediate sleeve 370, that is, the diameter of the first balls 330 is larger than the wall thickness of the first intermediate sleeve 370, the outer side of the first balls 330 protrudes outwardly from the outer circumferential surface of the first intermediate sleeve 370, and the inner side of the first balls 330 protrudes inwardly from the inner circumferential surface of the first intermediate sleeve 370.

The outer peripheral surface of the first inner sleeve 320 is provided with a first inner sleeve ball groove 321 suitable for being matched with the first ball 330, the inner peripheral surface of the upper spray arm connecting sleeve 130 is provided with an upper spray arm ball groove 131 suitable for being matched with the first ball 330, the first ball 330 is in rolling contact with the first inner sleeve ball groove 321 and the upper spray arm ball groove 131, and the first inner sleeve 320 is fixedly connected with the lower spray arm upper connecting sleeve 220, so that when the lower spray arm 200 and the upper spray arm 100 rotate relatively, the upper spray arm connecting sleeve 130 is in rolling contact with the lower spray arm upper connecting sleeve 220, and the friction force is small.

The upper spray arm ball groove 131 and the first inner sleeve ball groove 321 are circumferential annular grooves, so that the smoothness of the whole rotation of the upper spray arm 100 can be ensured. In an exemplary embodiment, the diameters of the upper spray arm ball groove 131 and the first inner sleeve ball groove 321 may be equal to the diameter of the first ball 330, or may be slightly larger than the diameter of the first ball 330, so as to ensure that the first ball 330 is well fitted with the upper spray arm ball groove 131 and the first inner sleeve ball groove 321.

In the central axis direction of the upper spray arm connecting sleeve 130, the positions of the upper spray arm ball groove 131, the first inner sleeve ball groove 321 and the first ball hole 350 are corresponding to each other, so that when the upper spray arm 100 rotates, the sliding track of the first ball 330 is prevented from being different from the sliding track of the upper spray arm ball groove 131 and the first inner sleeve ball groove 321, and the upper spray arm 100 cannot rotate due to extrusion.

Alternatively, the first ball hole 350 is provided at the top of the first intermediate sleeve 370, and as shown in fig. 13, the first ball hole 350 is a major arc hole, and a first ball taking and placing opening 351 is formed at a notch of the top of the first ball hole 350. The first ball 330 enters the first ball hole 350 through the first ball taking and placing opening 351 or exits from the first ball hole 350, thereby facilitating the mounting and dismounting of the first ball 330 in the first ball hole 350.

The major-arc hole is a hole having a central angle greater than 180 ° and less than 360 °, so that most of each first ball 330 is located in the first ball hole 350, and the first ball 330 is prevented from falling out of the first ball hole 350 after installation. When the first ball 330 is installed, the first ball taking and placing opening 351 can be opened by means of external force, then the first ball 330 is installed in the first ball hole 350 through the first ball taking and placing opening 351, then the external force is removed, the elastic deformation of the first ball hole 350 disappears, the first ball hole 350 is restored to the original state, the first ball hole 350 tightly wraps the first ball 330 at the moment, and the installation of the first ball 330 in the first ball hole 350 is firmer and more reliable.

Alternatively, the first weakening groove 360 is provided between two adjacent first ball holes 350, and by providing the first weakening groove 360, the rigidity between two adjacent first ball holes 350 may be made smaller, whereby the first ball holes 350 are easily deformed when the first balls 330 are mounted, thereby reducing the difficulty in mounting or dismounting the first balls 330. Be provided with first weakening groove stand 361 in the first weakening groove 360, first weakening groove stand 361 can play certain intensive effect to prevent that first weakening groove 360 from excessively weakening the rigidity of first middle sleeve 370, and then be favorable to improving the operational reliability of first ball subassembly 300.

In some embodiments, not shown, the first ball hole 350 is provided at the bottom of the first intermediate sleeve 370, and as shown in fig. 13, the first ball hole 350 is a major arc hole, and a first ball taking and placing opening 351 is formed at a bottom notch of the first ball hole 350.

Of course, in other embodiments, not shown, the first ball hole 350 may also be disposed at an intermediate position of the first intermediate sleeve 370, in which case the first ball hole 350 is a circular hole extending through the wall thickness of the first intermediate sleeve 370.

In some embodiments, the lower spray arm 200 is detachably connected to the upper spray arm 100.

Referring to fig. 4 to 6, the upper nozzle arm coupling sleeve 220 has a lower nozzle arm catch 270 at the top thereof, and the lower nozzle arm catch 270 is adapted to catch on the upper surface of the inner sleeve of the first ball assembly 300, i.e., the lower nozzle arm catch 270 is adapted to catch on the upper surface of the first inner sleeve 320. Therefore, the lower spray arm 200 and the first inner sleeve 320 can be reliably connected into a whole, the lower spray arm 200 and the upper spray arm 100 can be conveniently connected and disconnected, and the spray arm 1000 can be conveniently detached.

The top of adapter sleeve 220 has a plurality of spray arm recesses down on the spray arm, and the opening direction of spray arm recess down is parallel with the axis direction of adapter sleeve 220 on the spray arm down, and spray arm buckle 270 extends upwards from the diapire of spray arm recess down, and the both sides of spray arm buckle 270 down separate with two lateral walls of spray arm recess down, guarantees from this that spray arm buckle 270 can take place elastic deformation in spray arm recess down. The top end of the lower spray arm catch 270 is provided with a hook facing the first inner sleeve 320, and the hook is adapted to hook on the top end of the first inner sleeve 320, so as to limit the relative axial position of the lower spray arm 200 and the first inner sleeve 320.

When the first inner sleeve 320 and the lower spray arm 200 are assembled, the inner circumferential surface of the first inner sleeve 320 presses the hook of the lower spray arm fastener 270, so that the lower spray arm fastener 270 deforms toward the inside of the upper spray arm connection sleeve 220, and it is ensured that the lower spray arm fastener 270 can reach the top end of the first inner sleeve 320 from the bottom end of the first inner sleeve 320 (i.e., from below to above), when the lower spray arm fastener 270 passes over the top end of the first inner sleeve 320, the pressing force applied to the lower spray arm fastener 270 disappears, and under the action of the self elastic force of the lower spray arm fastener 270, the lower spray arm fastener 270 approaches the first inner sleeve 320, so that the hook hooks the top end of the first inner sleeve 320.

When the first inner sleeve 320 and the lower spray arm 200 need to be separated, the upper spray arm 100 is lifted upwards by force, the hook is squeezed by the top end of the first inner sleeve 320, the hook is retracted into the first inner sleeve 320, the upper spray arm 100 is continuously lifted, and the first inner sleeve 320 and the lower spray arm 200 can be separated.

The number of the lower spray arm fasteners 270 may be multiple (for example, four), the lower spray arm grooves correspond to the lower spray arm fasteners 270 one to one, and the multiple lower spray arm fasteners 270 are uniformly arranged along the circumferential direction of the connecting sleeve 220 on the lower spray arm, so that the fastening stability of the lower spray arm fasteners 270 and the first inner sleeve 320 can be improved.

The detachable connection between the connecting sleeve 220 on the lower spray arm and the first inner sleeve 320 can be realized by a screw connection in addition to the clamping connection. For example, in some embodiments, not shown, the first inner sleeve 320 of the first ball assembly 300 has inner sleeve threads, the lower nozzle arm upper connector 220 has lower nozzle arm upper threads, and the lower nozzle arm upper threads are threadably engaged with the inner sleeve threads, thereby enabling the lower nozzle arm upper connector 220 to be removably connected to the first inner sleeve 320, and enabling the lower nozzle arm upper connector 220 to be removably connected to the first inner sleeve 320 when the inner sleeve threads are unscrewed from the lower nozzle arm upper threads. The upper connecting sleeve 220 of the lower spray arm is in threaded connection with the first inner sleeve 320, so that the lower spray arm is convenient to assemble and disassemble and reliable in connection.

In some embodiments, as shown in fig. 14, the upper connecting sleeve 220 of the lower spray arm and the first inner sleeve 320 of the first ball assembly 300 are in an interference fit.

In some embodiments, as shown in fig. 14, the upper spray arm connecting sleeve 130 is in interference fit with the first outer sleeve 310 of the first ball assembly 300, so as to connect the upper spray arm 100 and the first ball assembly 300; or

In some embodiments, not shown, the first outer sleeve 310 of the first ball assembly 300 has an outer sleeve thread, and the upper nozzle arm connecting sleeve 130 has an upper nozzle arm thread, which is threadedly engaged with the outer sleeve thread, thereby enabling the connection of the upper nozzle arm 100 to the first ball assembly 300.

The second ball assembly 400 has a structure similar to that of the first ball assembly 300, and as shown in fig. 5 to 6 and 8, the second ball assembly 400 includes: the second intermediate sleeve 470, the second balls 430 and the second inner sleeve 420, wherein a plurality of second ball holes 450 are formed in the second intermediate sleeve 470, the second balls 430 are installed in the second ball holes 450, and the second ball holes 450 provide support for fixing the second balls 430, so that the relative positions of the second balls 430 are ensured to be unchanged, collision and extrusion between the second balls 430 are prevented, and thus the working stability of the first ball assembly 300 can be improved. And the second ball 430 protrudes from the inner circumferential surface and the outer circumferential surface of the second intermediate sleeve 470 in the radial direction of the second intermediate sleeve 470, the second inner sleeve 420 is disposed inside the second intermediate sleeve 470, the outer circumferential surface of the second inner sleeve 420 is provided with a second inner sleeve ball groove 421 adapted to cooperate with the second ball 430, the inner circumferential surface of the lower spray arm lower connection sleeve 240 is provided with a lower spray arm ball groove 243 adapted to cooperate with the second ball 430, when the lower spray arm 200 rotates relative to the spray arm seat 500, the second ball 430 makes rolling contact with the second inner sleeve ball groove 421 and the lower spray arm ball groove 243, and the friction force is small, thereby facilitating improvement of the smoothness of the spray arm rotation and reduction of the noise of the spray arm assembly 1000.

The lower spray arm ball groove 243 and the second inner sleeve ball groove 421 are circumferential annular grooves, so that the smoothness of the full-circle rotation of the lower spray arm 200 can be ensured. The diameters of the lower spray arm ball groove 243 and the second inner sleeve ball groove 421 may be equal to the diameter of the second ball 430, or may be slightly larger than the diameter of the second ball 430, so that the second ball 430 can be well fitted with the lower spray arm ball groove 243 and the second inner sleeve ball groove 421.

The lower spray arm 200 is detachably connected with the spray arm base 500.

Referring to fig. 4 to 6, the spray arm socket 500 includes: the spray arm seat body 510 is provided with a spray arm seat buckle 511 at the top of the spray arm seat body 510, the spray arm seat buckle 511 is suitable for being clamped at the top end of the inner sleeve of the second ball assembly 400, namely the spray arm seat buckle 511 is suitable for being clamped at the top end of the second inner sleeve 420, thereby realizing the fixed connection of the spray arm seat buckle 511 and the second inner sleeve 420. The spray arm seat 500 is indirectly connected with the lower spray arm 200 through the second ball assembly 400, and the spray arm seat 500, the lower spray arm 200 and the second ball assembly 400 are connected simply and stably.

The top of spouting arm seat body 510 has a plurality of spouting arm seat recesses, and the opening direction of spouting arm seat recess is parallel with the axis direction of spouting arm seat body 510, and spout arm seat buckle 511 upwards extends from the diapire of spouting arm seat recess, and the both sides of spouting arm seat buckle 511 are separated with two lateral walls of spouting arm seat recess, guarantees from this that spout arm seat buckle 511 can take place elastic deformation in spouting arm seat recess. The top end of the spray arm seat latch 511 is provided with a hook facing the second inner sleeve 420, and the hook is adapted to hook on the top end of the second inner sleeve 420, so as to limit the relative axial position of the spray arm seat 500 and the second inner sleeve 420.

When the second inner socket 420 and the spray arm holder 500 are assembled, the inner circumferential surface of the second inner socket 420 presses the hook of the spray arm holder latch 511, so that the spray arm holder latch 511 deforms toward the interior of the spray arm holder body 510, and the spray arm holder latch 511 can reach the top end of the second inner socket 420 (i.e., from the bottom to the top) from the bottom end of the second inner socket 420, when the spray arm holder latch 511 passes over the top end of the second inner socket 420, the pressing force applied to the spray arm holder latch 511 disappears, and under the elastic force of the spray arm holder latch 511, the spray arm holder latch 511 approaches the second inner socket 420, so that the hook catches the top end of the second inner socket 420.

When the second inner sleeve 420 needs to be separated from the spray arm base 500, the lower spray arm 200 is lifted upwards only by force, the hook is squeezed at the top end of the second inner sleeve 420, the hook is retracted into the second inner sleeve 420, the lower spray arm 200 is continuously lifted, and the second inner sleeve 420 can be separated from the spray arm base 500.

The number of the spray arm seat buckles 511 may be multiple (for example, four), the spray arm seat grooves correspond to the spray arm seat buckles 511 one by one, and the spray arm seat buckles 511 are uniformly arranged along the circumferential direction of the spray arm seat body 510, so that the buckling stability of the spray arm seat buckles 511 and the second inner sleeve 420 may be improved.

Further, the spray arm base 500 further includes: the spray arm seat flange 520, the spray arm seat flange 520 extends radially outwardly from the spray arm seat body 510, thereby facilitating improved stability of the connection of the spray arm assembly 1000 to the dishwasher liner. The second ball assembly 400 is arranged above the spray arm seat flange 520, the lower spray arm lower connecting sleeve 240, the gap between the lower surface of the second ball assembly 400 and the upper surface of the spray arm seat flange 520 are all L1, and L1 satisfies the relation: l1 is more than 0mm and less than or equal to 1 mm. I.e., the lower nozzle arm lower adapter 240, second intermediate sleeve 470, and the lower surface of second inner sleeve 420, and the upper surface of nozzle arm base flange 520, are separated by a gap L1, L1 may be 0.3mm, 0.5mm, or 0.8 mm. Therefore, when the lower spray arm 200 and the spray arm seat 500 rotate relatively, sliding friction caused by contact between the lower surfaces of the lower spray arm lower connection sleeve 240, the second intermediate sleeve 470 and the second inner sleeve 420 and the upper surface of the spray arm seat flange 520 can be avoided, and the lower spray arm 200 can be prevented from being locked even if the friction between the lower spray arm 200 and the spray arm seat 500 is increased due to the fact that leftover or other pollutants enter the gap, and when the lower spray arm 200 tilts, the lower spray arm lower connection sleeve 240 can be rapidly contacted with the spray arm seat 500, so that the lower spray arm 200 is prevented from further tilting.

The detachable connection between the spray arm socket body 510 and the second inner sleeve 420 may be a screw connection, in addition to the above-mentioned snap connection. For example, in some embodiments, not shown, the second inner sleeve 420 of the second ball assembly 400 has inner sleeve threads, and the spray arm socket 500 has spray arm socket threads that are threadably engaged with the inner sleeve threads, thereby providing for a removable connection of the spray arm socket body 510 to the second inner sleeve 420. When the spray arm seat thread and the inner sleeve thread are unscrewed, the spray arm seat body 510 and the second inner sleeve 420 can be detached. The spray arm seat body 510 is connected with the second inner sleeve 420 through threads, so that the spray arm seat is convenient to assemble and disassemble and reliable in connection.

In some embodiments, as shown in fig. 15, the spray arm socket 500 is an interference fit with the second inner sleeve 420 of the second ball bearing assembly 400.

In some embodiments, as shown in fig. 14 or fig. 15, the lower spray arm connecting sleeve 240 and the second outer sleeve 410 of the second ball assembly 400 are in interference fit; or

In some embodiments, as shown in fig. 9 or 10, the second outer sleeve 410 of the second ball assembly 400 has outer sleeve threads and the lower spray arm lower connection sleeve 240 has lower spray arm lower threads that are threadedly engaged with the outer sleeve threads. Alternatively, the second ball hole 450 is provided at the top of the second intermediate sleeve 470, the second ball hole 450 is a major arc hole, and the second ball taking and placing hole 451 is formed at a gap at the top of the second ball hole 450. The second ball 430 enters the second ball hole 450 through the second ball taking and placing hole 451 or comes out of the second ball hole 450, thereby facilitating the mounting and dismounting of the second ball 430 in the second ball hole 450. Most of each second ball 430 is located in the second ball hole 450, preventing the second ball 430 from falling out of the second ball hole 450 after the installation is completed.

Optionally, a second weakening groove 460 is disposed between two adjacent second ball holes 450, and a second weakening groove column 461 is disposed in the second weakening groove 460. The second intermediate sleeve 470 may be identical in structure to the first intermediate sleeve 370.

In some embodiments, not shown, the second ball hole 450 may also be provided at the bottom of the second intermediate sleeve 470,

of course, in other embodiments not shown, the second ball hole 450 may also be disposed at an intermediate position of the second intermediate sleeve 470, in which case the second ball hole 450 is a circular hole extending through the wall thickness of the second intermediate sleeve 470. In the embodiment shown in fig. 14-15, the first ball assembly 300 and the second ball assembly 400 may also adopt the following structure:

each of the first ball assembly 300 and the second ball assembly 400 includes:

the ball bearing device comprises an outer sleeve, an inner sleeve, a middle sleeve and balls, wherein the inner sleeve is arranged inside the outer sleeve, the middle sleeve is arranged between the outer sleeve and the inner sleeve, a plurality of ball holes are formed in the middle sleeve, the balls are arranged in the ball holes, and the balls radially protrude out of the inner circumferential surface and the outer circumferential surface of the middle sleeve.

Specifically, the first ball assembly 300 includes: the ball bearing assembly comprises a first outer sleeve 310, a first intermediate sleeve 370, first balls 330 and a first inner sleeve 320, wherein the first inner sleeve 320 is arranged inside the first outer sleeve 310, the first intermediate sleeve 370 is arranged between the first outer sleeve 310 and the first inner sleeve 320, a plurality of first ball holes 350 are formed in the first intermediate sleeve 370, the first balls 330 are installed in the first ball holes 350, and the first balls 330 protrude from the inner circumferential surface and the outer circumferential surface of the first intermediate sleeve 370 in the radial direction of the first intermediate sleeve 370. The outer circumferential surface of the first inner sleeve 320 is provided with a first inner sleeve ball groove 321 adapted to cooperate with the first ball 330, the inner circumferential surface of the upper spray arm connecting sleeve 130 is attached to the outer circumferential surface of the first outer sleeve 310, and preferably, the upper spray arm connecting sleeve 130 is in interference fit with the first outer sleeve 310, so that the connection firmness of the first ball assembly 300 and the upper spray arm 100 can be improved. The inner circumferential surface of the first outer sleeve 310 is provided with a first outer sleeve ball groove 313 adapted to cooperate with the first ball 330, and the rolling connection of the upper spray arm connecting sleeve 130 and the lower spray arm upper connecting sleeve 220 can be also achieved by directly cooperating the first ball 330 with the first inner sleeve 320 and the first outer sleeve 310. The first outer sleeve ball groove 313 and the first inner sleeve ball groove 321 are circumferential annular grooves, so that the upper spray arm 100 and the lower spray arm 200 can rotate relatively in a whole circle.

When the upper spray arm connecting sleeve 130 and the lower spray arm upper connecting sleeve 220 rotate relatively, the first outer sleeve 310 and the first inner sleeve 320 rotate relatively through the first balls 330, and the friction force between the upper spray arm 100 and the lower spray arm 200 is equivalent to rolling friction force, which is beneficial to reducing hydrodynamic loss.

At this time, the first ball assembly 300 is a complete component, and can be supplied separately, and the assembly of the first ball assembly 300 with the upper spray arm connecting sleeve 130 and the lower spray arm upper connecting sleeve 220 can be completed without changing the upper spray arm connecting sleeve 130 and the lower spray arm upper connecting sleeve 220, which is beneficial to reducing the processing procedures of the spray arm assembly 1000. The first ball assembly 300 is an independent modular component, so that the assembly and disassembly are convenient, and the processing cost of the lower spray arm 200 or the upper spray arm 100 is reduced.

The second ball assembly 400 includes: the second outer sleeve 410, the second intermediate sleeve 470, the second balls 430, and the second inner sleeve 420, the second inner sleeve 420 being disposed inside the second outer sleeve 410, the second intermediate sleeve 470 being disposed between the second outer sleeve 410 and the second inner sleeve 420, the second intermediate sleeve 470 being provided with a plurality of second ball holes 450, the second balls 430 being mounted in the second ball holes 450, and the second balls 430 protruding from inner and outer circumferential surfaces of the second intermediate sleeve 470 in a radial direction of the second intermediate sleeve 470. The outer peripheral surface of the second inner sleeve 420 is provided with a second inner sleeve ball groove 421 adapted to cooperate with the second ball 430, the inner peripheral surface of the lower spray arm lower connection sleeve 240 is attached to the outer peripheral surface of the second outer sleeve 410, preferably, the lower spray arm lower connection sleeve 240 and the second outer sleeve 410 are in interference fit, so that the connection firmness of the second ball assembly 400 and the lower spray arm 200 can be improved. The inner circumferential surface of the second outer sleeve 410 is provided with a second outer sleeve ball groove 413 adapted to cooperate with the second ball 430, and the rolling connection of the lower spray arm lower connection sleeve 240 and the spray arm base body 510 can also be achieved by directly cooperating the second ball 430 with the second inner sleeve 420 and the second outer sleeve 410. The second outer sleeve ball groove 413 and the second inner sleeve ball groove 421 are circumferential annular grooves, so that the lower spray arm 200 and the spray arm holder 500 can rotate relatively in a whole circle.

When the lower spray arm lower connection sleeve 240 and the spray arm base body 510 rotate relatively, the second outer sleeve 410 and the second inner sleeve 420 rotate relatively through the second balls 430, and the friction between the lower spray arm 200 and the spray arm base 500 is equivalent to rolling friction, which is beneficial to reducing hydrodynamic loss.

At this time, the second ball assembly 400 is a complete component, and can be supplied separately, and the lower spray arm connecting sleeve 240 and the spray arm base body 510 do not need to be changed, so that the assembly of the second ball assembly 400, the lower spray arm connecting sleeve 240 and the spray arm base body 510 can be completed, and the reduction of the processing procedures of the spray arm assembly 1000 is facilitated.

The first intermediate sleeve 370 and the second intermediate sleeve 470 function mainly in three points: (1) the ball holes are formed in the middle sleeves, and the balls are arranged in the ball holes, so that the positions of the balls can be fixed and limited, and the balls are prevented from being accumulated; (2) the food residue is isolated, and the small food residues are prevented from entering the ball groove to cause friction; (3) the spray arm has a strengthening effect, can isolate the vibration between the upper spray arm 100 and the lower spray arm 200 and between the lower spray arm 200 and the spray arm seat 500, and prevents the spray arm from shaking seriously.

Referring to fig. 9-10, in some embodiments of the present invention, the lower nozzle arm 200 has lower nozzle arm threads 280, and the second ball assembly 400 includes: a bearing base and a second ball 430, the second ball 430 being rotatably disposed on the bearing base, the bearing base being provided with a base thread that mates with the lower spray arm thread 280.

According to one embodiment of the present invention, shown in FIG. 9, the load bearing substrate may comprise: a second outer sleeve 410, a second intermediate sleeve 470, and a second inner sleeve 420.

The second outer sleeve 410 is provided on an inner circumferential surface thereof with a second outer sleeve ball groove 413 adapted to be engaged with the second balls 430, the second intermediate sleeve 470 is disposed inside the second outer sleeve 410, the second balls 430 are disposed on the second intermediate sleeve 470, the second inner sleeve 420 is disposed inside the second intermediate sleeve 470, and an outer circumferential surface of the second inner sleeve 420 is provided with a second inner sleeve ball groove 421 adapted to be engaged with the second balls 430, i.e., the second balls 430 are in rolling contact with an inner surface of the second outer sleeve 410 and also in rolling contact with an outer surface of the second inner sleeve 420. The second inner sleeve ball groove 421 and the second outer sleeve ball groove 413 are circumferential annular grooves, so that the smoothness of the full-circle rotation of the lower spray arm 200 can be ensured. The second balls 430 are in rolling contact with the second inner sleeve ball groove 421 and the second outer sleeve ball groove 413, and friction is small. In an exemplary embodiment, the diameters of the second inner sleeve ball groove 421 and the second outer sleeve ball groove 413 may be equal to the diameter of the second ball 430, or may be slightly larger than the diameter of the second ball 430, so as to ensure that the second ball 430 is well matched with the second inner sleeve ball groove 421 and the second outer sleeve ball groove 413.

Further, referring to fig. 9, in the central axis direction of the lower nozzle arm lower connection sleeve 240, the second outer sleeve ball groove 413, the second inner sleeve ball groove 421, and the second ball hole 450 correspond in position, the second balls 430 are partially disposed in the second ball hole 450, the outer side of the second balls 430 is in contact with the second outer sleeve ball groove 413, and the inner side of the second balls 430 is in contact with the second inner sleeve ball groove 421, thereby completing the connection of the second outer sleeve 410 and the second inner sleeve 420. The positions of the second outer sleeve ball groove 413, the second inner sleeve ball groove 421 and the second ball hole 450 correspond to each other, so that when the lower spray arm 200 rotates, the sliding track of the second ball 430 is prevented from being different from the sliding track of the second outer sleeve ball groove 413 and the second inner sleeve ball groove 421, and the lower spray arm 200 cannot rotate due to extrusion.

Further, a second inner socket external thread 422 is provided on an outer circumferential surface of the second inner socket 420, and a spray arm socket internal thread 530 adapted to be engaged with the second inner socket external thread 422 is provided on an inner circumferential surface of the spray arm socket 500. That is, the spray arm base 500 and the second inner sleeve 420 are fixedly connected in a screw connection manner, and are convenient to assemble and disassemble and reliable in connection.

Specifically, the base threads are second outer sleeve internal threads 414 disposed on an inner circumferential surface of the second outer sleeve 410, and the lower spray arm threads 280 are lower spray arm external threads disposed on an outer circumferential surface of the lower spray arm connecting sleeve 240, the lower spray arm external threads being adapted to mate with the second outer sleeve internal threads 414. That is, the lower spray arm 200 and the second outer sleeve 410 are fixedly connected in a screw connection manner, and are convenient to assemble and disassemble and reliable in connection.

The lower spray arm 200 and the spray arm seat 500 are indirectly connected through the second ball assembly 400, and the lower spray arm 200, the spray arm seat 500 and the second ball assembly 400 are connected simply and stably.

When the lower spray arm 200 rotates relative to the spray arm holder 500, the second balls 430 roll, so that the second outer sleeve 410 and the second inner sleeve 420 rotate relative to each other, and because the lower spray arm 200 is fixed to the second outer sleeve 410 and the spray arm holder 500 is fixed to the second inner sleeve 420, the relative rotation between the lower spray arm 200 and the spray arm holder 500 is realized.

Preferably, the second inner sleeve external thread 422 is located below the second inner sleeve ball groove 421, in other words, the fitting position of the second inner sleeve 420 and the lower spray arm 200 is located above, and the fixing position of the second inner sleeve 420 and the spray arm socket 500 is located below, so that the height space of the second ball assembly 400 can be fully utilized, and the axial dimension of the connection position of the lower spray arm 200 and the spray arm socket 500 is prevented from being too large.

The second middle sleeve 470 is provided with a plurality of second ball holes 450, the second balls 430 are installed in the second ball holes 450, the second ball holes 450 provide support for fixing the second balls 430, the relative positions of the second balls 430 are guaranteed to be unchanged, collision and extrusion between the second balls 430 are prevented, and therefore the working stability of the second ball assembly 400 can be improved, and the smoothness of the spray arm during rotation can be further improved. Alternatively, the number of the second balls 430 is the same as the number of the second ball holes 450.

The number of the second balls 430 is plural, and the plural second balls 430 may be uniformly distributed along the circumferential direction of the second intermediate sleeve 470, thereby making the relative rotation of the lower spray arm 200 and the spray arm holder 500 more smooth.

The second balls 430 protrude from the inner circumferential surface and the outer circumferential surface of the second intermediate sleeve 470 in the radial direction of the second intermediate sleeve 470, the second balls 430 are in rolling contact with the second outer sleeve 410 and the second inner sleeve 420, and since the second outer sleeve 410 is fixed to the lower spray arm connecting sleeve 240 and the second inner sleeve 420 is fixed to the spray arm base 500, the lower spray arm 200 is indirectly connected to the spray arm base 500 through the second ball assembly 400, which is equivalent to the rolling contact between the lower spray arm 200 and the spray arm base 500, and the second balls 430 provide support for the connection between the lower spray arm 200 and the spray arm base 500.

When the lower spray arm 200 and the spray arm base 500 rotate relatively, the second outer sleeve 410 and the second inner sleeve 420 contact each other through the second balls 430, so that rolling friction exists between the second outer sleeve 410 and the second inner sleeve 420.

Referring to fig. 9, the top of the spray arm socket 500 has a spray arm socket flange 520, the spray arm socket flange 520 extends outward in a radial direction of the spray arm socket 500, the spray arm socket flange 520 is disposed below the second outer sleeve 410, and a gap between an upper surface of the spray arm socket flange 520 and a lower surface of the second outer sleeve 410 is L2, and L2 satisfies a relation: l2 is more than 0mm and less than or equal to 1 mm. Therefore, when the lower spray arm 200 and the spray arm seat 500 rotate relatively, the sliding friction caused by the contact between the lower surface of the second outer sleeve 410 and the upper surface of the spray arm seat flange 520 can be avoided, and the situation that the residual food or other pollutants enter the gap to increase the friction between the lower spray arm 200 and the spray arm seat 500 and even block the lower spray arm 200 can be prevented. Alternatively, L2 may be 0.3mm, 0.5mm, or 0.8 mm.

Specifically, the lower nozzle arm lower connection sleeve 240 includes: a connecting sleeve peripheral wall 241 and a connecting sleeve bottom wall 242, the connecting sleeve bottom wall 242 extends inward along the radial direction of the connecting sleeve peripheral wall 241, the connecting sleeve bottom wall 242 is arranged at one end of the connecting sleeve peripheral wall 241 far away from the lower spray arm body 230, as shown in fig. 9, and the connecting sleeve bottom wall 242 is arranged at the lower end of the connecting sleeve peripheral wall 241. The second inner sleeve 420 and the second middle sleeve 470 are arranged below the connecting sleeve bottom wall 242, the inner diameter of the connecting sleeve bottom wall 242 is equal to the inner diameter of the second inner sleeve 420, when a water source of the dishwasher is opened, water flows through the second inner sleeve 420 through the spray arm seat 500 firstly and then flows into the lower chamber 250, therefore, the inner diameter of the connecting sleeve bottom wall 242 is equal to the inner diameter of the second inner sleeve 420, the water flow speed of the lower spray arm 200 and the second inner sleeve 420 can be guaranteed to be equal, the water flow speed of the water flowing into the lower chamber 250 is stable, the water pressure in the lower chamber 250 is guaranteed to rise stably, the sudden change of the flow speed at the connection part of the lower spray arm 200 and the spray arm seat 500 is prevented, the lower spray arm 200 can rotate stably, and the high working reliability of the spray arm assembly 1000 is guaranteed.

The gap between the upper surface of the second inner sleeve 420 and the lower surface of the connecting sleeve bottom wall 242 is L3, and L3 satisfies the relation: 0mm < L3 ≦ 0.5mm, for example L3 may be 0.1mm, 0.2mm or 0.3 mm. Therefore, when the lower spray arm 200 and the spray arm seat 500 rotate relatively, sliding friction caused by contact between the upper surface of the second inner sleeve 420 and the lower surface of the connecting sleeve bottom wall 242 can be avoided, that is, no friction exists between the second inner sleeve 420 and the lower spray arm 200, in addition, the gap between the upper surface of the second inner sleeve 420 and the lower surface of the connecting sleeve bottom wall 242 is small, water leakage can be avoided, residual rice or other pollutants can be prevented from entering the gap to increase the friction force between the lower spray arm 200 and the spray arm seat 500, and even the lower spray arm 200 is locked, and when the lower spray arm 200 inclines, the lower spray arm 200 can quickly contact with the second inner sleeve 420, so that the lower spray arm 200 is prevented from further inclining.

Referring to fig. 9, the bottom of the spray arm socket 500 has a spray arm socket feed shaft 540 extending radially inward of the spray arm socket 500, and the spray arm socket feed shaft 540 has an inner diameter equal to that of the second inner sleeve 420. Similarly, when the water source of the dishwasher is turned on, the water flow firstly flows through the spray arm seat 500 and flows through the second inner sleeve 420, therefore, the inner diameter of the spray arm seat water inlet shaft 540 is equal to the inner diameter of the second inner sleeve 420, the water flow speed in the spray arm seat 500 and the second inner sleeve 420 can be ensured to be equal, the water flow speed of the water flow entering the second inner sleeve 420 is stable, thereby ensuring that the water flow speed is stable when the water enters the lower chamber 250 through the second inner sleeve 420 and the connecting sleeve bottom wall 242, preventing the sudden change of the flow speed at the connection part of the lower spray arm 200 and the spray arm seat 500, and ensuring that the lower spray arm 200 can stably rotate.

According to yet another embodiment of the present invention, shown in FIG. 10, the load bearing substrate may comprise: a second outer sleeve 410 and a second intermediate sleeve 470.

A second outer sleeve ball groove 413 adapted to be engaged with the second ball 430 is provided on an inner circumferential surface of the second outer sleeve 410, a second intermediate sleeve 470 is provided inside the second outer sleeve 410, a spray arm socket 500 is provided inside the second intermediate sleeve 470, and a spray arm socket ball groove 570 adapted to be engaged with the second ball 430 is provided on an outer circumferential surface of the spray arm socket 500.

The number of the second balls 430 is plural, and the plural second balls 430 may be uniformly distributed along the circumferential direction of the second intermediate sleeve 470, thereby making the relative rotation of the lower spray arm 200 and the spray arm holder 500 more smooth. Preferably, the number of the second balls 430 is even, so that the second ball assembly 400 can be uniformly stressed to alleviate the stress concentration phenomenon.

The second balls 430 protrude from the inner circumferential surface and the outer circumferential surface of the second intermediate sleeve 470 in the radial direction of the second intermediate sleeve 470, and when the lower spray arm 200 and the spray arm holder 500 relatively rotate, the second outer sleeve 410 and the spray arm holder 500 are in contact with each other through the second balls 430, so that rolling friction is generated between the second outer sleeve 410 and the spray arm holder 500.

The spray arm seat ball groove 570 and the second outer sleeve ball groove 413 are circumferential annular grooves, so that the smoothness of the full-circle rotation of the lower spray arm 200 can be ensured. The second ball 430 is in rolling contact with the spray arm seat ball groove 570 and the second outer sleeve ball groove 413, and friction is small. In an exemplary embodiment, the diameters of the spray arm seat ball groove 570 and the second outer sleeve ball groove 413 may be equal to the diameter of the second ball 430, or may be slightly larger than the diameter of the second ball 430, thereby ensuring that the second ball 430 fits well with the spray arm seat ball groove 570 and the second outer sleeve ball groove 413.

Further, the base thread is a second outer sleeve external thread 415 provided on an outer circumferential surface of the second outer sleeve 410, and the lower spray arm thread 280 is a lower spray arm internal thread provided on an inner circumferential surface of the lower spray arm connecting sleeve 240, the lower spray arm internal thread being adapted to mate with the second outer sleeve external thread 415. That is, the lower spray arm 200 and the second outer sleeve 410 are fixedly connected in a screw connection manner, and are convenient to assemble and disassemble and reliable in connection.

The second outer sleeve 410 may include: the second outer sleeve peripheral wall 411 and the second outer sleeve bottom wall 412, the second outer sleeve bottom wall 412 is arranged at the bottom of the second outer sleeve peripheral wall 411, the second outer sleeve bottom wall 412 extends inwards along the radial direction of the second outer sleeve peripheral wall 411, and the second balls 430 are arranged above the second outer sleeve bottom wall 412, so that the second outer sleeve bottom wall 412 can play a certain role in protecting the second balls 430, and the second balls 430 are prevented from being exposed to the outside to influence the service life of the second balls 430.

The second ball hole 450 is a major arc hole, and a second ball taking and placing opening 451 is formed at a bottom notch of the second ball hole 450. The second ball 430 enters the second ball hole 450 through the second ball taking and placing hole 451 or comes out of the second ball hole 450, thereby facilitating the mounting and dismounting of the second ball 430 in the second ball hole 450.

Alternatively, a second weakening groove 460 is provided between two adjacent second ball holes 450, and by providing the second weakening groove 460, the rigidity between two adjacent second ball holes 450 may be made smaller, whereby the second ball holes 450 are easily deformed when the second ball 430 is mounted, thereby reducing the difficulty in mounting or dismounting the second ball 430.

A second weakening groove column 461 is arranged in the second weakening groove 460, and optionally, the central axis of the second weakening groove column 461 is parallel to the central axis of the second intermediate sleeve 470, thereby facilitating the simplification of the processing process of the second intermediate sleeve 470. The second weakening groove pillar 461 is provided to play a certain reinforcing role, so as to prevent the second weakening groove 460 from excessively weakening the rigidity of the second intermediate sleeve 470, thereby facilitating the improvement of the operational reliability of the second ball assembly 400.

The second outer sleeve male screw 415 is provided on the outer circumferential surface of the second outer sleeve circumferential wall 411, the second outer sleeve ball groove 413 is provided on the inner circumferential surface of the second outer sleeve circumferential wall 411, and the second outer sleeve ball groove 413 is provided below the second outer sleeve male screw 415, whereby the fixing position of the second outer sleeve 410 and the lower spray arm 200 is located above, and the fitting position of the second outer sleeve 410 and the spray arm holder 500 is located below, whereby the height space is fully utilized, and the axial dimension of the joint fitting portion of the lower spray arm 200 and the spray arm holder 500 is prevented from being too large.

In a specific embodiment, the ball can be plastics ball or stainless steel ball, because spray arm assembly 1000's operational environment has been full of water, spray arm assembly 1000 is in the damp and hot environment for a long time, easily leads to the ball to get rusty the jamming, and plastics ball or stainless steel ball's anti-corrosion ability is stronger, can effectively slow down or even avoid the ball to get rusty.

Optionally, the length of the upper spray arm body 120 is 0.5-2 times the length of the lower spray arm body 230.

Specifically, in some embodiments, the length of the upper nozzle arm 120 is 0.5 to 1 times of the length of the lower nozzle arm 230, and the upper nozzle arm 120 is shorter, so that the weight of the upper nozzle arm 100 can be reduced, the upper nozzle arm 100 can rotate smoothly, and the entire nozzle arm is stable in structure and is not prone to tip over. In addition, the length of the upper spray arm body 120 is smaller than that of the lower spray arm body 230, so that the volume of the upper chamber 140 is smaller than that of the lower chamber 250, most of water flow preferentially enters the lower chamber 250 in the cleaning stage, the water pressure in the lower chamber 250 is higher, the water column pressure sprayed from the first driving hole 211 is higher, and the lower spray arm 200 can smoothly rotate along the first direction. The length of the upper spray arm body 120 is set to be short, so that the volume of the upper chamber 140 can be reduced, and therefore the water pressure in the upper chamber 140 is high enough, and the pressure of the water column sprayed out from the second driving hole 111 is high, so that a large reverse driving force is generated, and the upper spray arm 100 is driven to smoothly rotate along the second direction.

Or in some embodiments, the length of the upper spray arm body 120 is greater than the length of the lower spray arm body 230, for example, the length of the upper spray arm body 120 is 1 to 2 times the length of the lower spray arm body 230, so that the length of the force arm of the upper spray arm body 120 can be increased, and the upper spray arm body 120 can be driven to rotate with a smaller driving force. In addition, the longer the upper spray arm body 120 is, the larger the washing area is, preferably, the length of the upper spray arm body 120 is equal to the length of the lower spray arm body 230, and the length of the upper spray arm body 120 and the lower spray arm body 230 is the longest dimension that can be accommodated inside the dishwasher, thereby being advantageous to improve the washing capacity.

The ratio of the length of the shortest spray arm to the length of the longest spray arm is not less than 0.5, because the spray arm is too short, a larger driving force is required, and thus the aperture of the driving hole is larger or the number of the driving holes is larger, and compared with the spray hole, the amount of water sprayed from the driving hole to the tableware is smaller, which is not good for washing, and therefore the spray arm is not too short, and therefore it is reasonable to set the minimum ratio of the length of the shortest spray arm to the length of the longest spray arm to 0.5.

As shown in fig. 1 to 2, the lower spray arm body 230 is provided with a first driving protrusion 210, the first driving protrusion 210 protrudes out of the surface of the lower spray arm body 230, and a first driving hole 211 is formed on the first driving protrusion 210. Specifically, the first driving protrusion 210 is disposed on the upper end surface of the lower nozzle arm body 230, the first driving hole 211 with a specific orientation is conveniently opened by disposing the first driving protrusion 210, the first driving hole 211 is disposed on the first driving protrusion 210, and in some embodiments, the orientation (i.e., the normal direction) of the first driving hole 211 may be parallel to the bilateral symmetry plane of the lower nozzle arm 200, so that it may be ensured that the reaction force generated when the water column is ejected from the first driving hole 211 rotates the lower nozzle arm 200 in the first direction.

The upper spray arm body 120 is provided with a second driving protrusion 110, the second driving protrusion 110 protrudes out of the surface of the upper spray arm body 120, and a second driving hole 111 is formed on the second driving protrusion 110. Specifically, the second driving protrusion 110 is disposed on the upper end surface of the upper spray arm body 120, the second driving protrusion 110 has the same function as the first driving protrusion 210, and the orientation (i.e., the normal direction) of the second driving hole 111 may be parallel to the bilateral symmetry plane of the upper spray arm 100, which has the same effect as the first driving hole 211, and is not repeated herein, except that the orientation of the second driving hole 111 is opposite to the orientation of the first driving hole 211, so that when the water column is sprayed out from the second driving hole 111, the generated reaction force may rotate the upper spray arm 100 in the second direction, thereby ensuring that the rotation directions of the upper spray arm 100 and the lower spray arm 200 are opposite.

Further, the included angle between the normal of the first driving hole 211 and the axis of the upper connecting sleeve 220 of the lower spray arm is 0-90 degrees, and the included angle between the normal of the second driving hole 111 and the axis of the upper connecting sleeve 130 of the upper spray arm is 0-90 degrees.

Alternatively, the first driving hole 211 and the second driving hole 111 are oriented in opposite directions at the same end of the lower spray arm body 230 and the upper spray arm body 120, thereby ensuring that the upper spray arm 100 and the lower spray arm 200 rotate in opposite directions. The first driving hole 211 and the second driving hole 111 may be plural, thereby facilitating an increase in the amount of water sprayed while improving the driving force.

Alternatively, the number of the first driving holes 211 is two, and the two first driving holes 211 are respectively disposed at two ends of the lower nozzle arm body 230, and the first driving hole 211 disposed at one end (for example, the right end) of the lower nozzle arm body 230 should be opposite to the first driving hole 211 disposed at the other end (for example, the left end) of the lower nozzle arm body 230, so that the same direction of the reaction moment generated from each first driving hole 211 can be ensured, thereby facilitating the improvement of the rotational driving force of the lower nozzle arm 200, and ensuring that the rotational speed of the lower nozzle arm 200 is faster.

The number of the second driving holes 111 is two, and the two second driving holes 111 are respectively formed at two ends of the upper spray arm body 120, and the second driving holes 111 formed at one end (for example, the right end) of the upper spray arm body 120 should be opposite to the second driving holes 111 formed at the other end (for example, the left end) of the upper spray arm body 120, so that the same direction of the reaction moment generated from each second driving hole 111 can be ensured, thereby facilitating the improvement of the rotational driving force of the upper spray arm 100, and ensuring the faster rotational speed of the upper spray arm 100.

By increasing the number of driving holes, the amount of water discharged per unit time can be increased, thereby increasing the driving force. The first driving hole 211 is arranged at the end of the lower spray arm body 230, the second driving hole 111 is arranged at the end of the upper spray arm body 120, which is beneficial to increase the length of the arm of force of the driving force at the first driving hole 211 and the second driving hole 111, so that the lower spray arm 200 and the upper spray arm 100 can be driven to rotate only by consuming less energy of water, therefore, in a specific embodiment, the first driving hole 211 is as far as possible from the central position of the lower spray arm body 230, and the second driving hole 111 is as far as possible from the central position of the upper spray arm body 120, the first driving hole 211 is preferably arranged at the end of the lower spray arm body 230, the second driving hole 111 is preferably arranged at the end of the upper spray arm body 120, when water columns are sprayed from the first driving hole 211 and the second driving hole 111, the rotating shafts of the lower spray arm 200 and the upper spray arm 100 are subjected to higher torque, thereby ensuring that the reaction force generated when the water columns are sprayed is utilized as much as possible, the speed at which the lower spray arm 200 and the upper spray arm 100 rotate is increased, thereby facilitating the cleaning effect of the spray arm assembly 1000.

Alternatively, the first and second driving

protrusions

210 and 110 are configured as a rectangular parallelepiped, a cube, a rectangular pyramid, a trapezoid, or a cylinder, but not limited to the above structure. In the example of fig. 1-2, 11-12, the first drive protrusion 210 and the second drive protrusion 110 are each configured as a rectangular pyramid.

Based on the embodiment of fig. 5 and 14, the first ball assembly 300 of the present invention can have various modifications, and the modifications fall into the scope of the present invention. A plurality of modifications of the first ball assembly 300 according to the embodiment of the present invention will be outlined below with reference to fig. 5 and 14.

For example, in a first embodiment, not shown, the first ball assembly 300 may include only: the rolling connection of the upper and lower spray

arm connection sleeves

130 and 220 is also achieved by the first balls 330, i.e., the first intermediate sleeve 370, the first inner sleeve 320 and the first outer sleeve 310 are eliminated as compared to the embodiment of fig. 14 described above, and the first balls 330 directly engage the upper and lower spray

arm connection sleeves

130 and 220. At this time, an upper spray arm ball groove adapted to be engaged with the first ball 330 is formed on an inner circumferential surface of the upper spray arm connecting sleeve 130, and a lower spray arm ball groove adapted to be engaged with the first ball 330 is formed on an outer circumferential surface of the lower spray arm upper connecting sleeve 220.

For example, in a second embodiment thereof not shown, the first ball assembly 300 may include only: the rolling connection of the upper nozzle arm connecting sleeve 130 to the lower nozzle arm upper connecting sleeve 220 is also achieved by the first balls 330 and the first inner sleeve 320, i.e., the first intermediate sleeve 370 and the first outer sleeve 310 are eliminated from the embodiment of fig. 14 as described above, and the first balls 330 directly engage the first inner sleeve 320 and the upper nozzle arm connecting sleeve 130. At this time, an inner circumferential surface of the upper spray arm connecting sleeve 130 is provided with an upper spray arm ball groove adapted to be engaged with the first ball 330, and an outer circumferential surface of the first inner sleeve 320 is provided with a first inner sleeve ball groove 321 adapted to be engaged with the first ball 330.

For example, in an embodiment in which the third is not shown, the first ball assembly 300 may include only: the rolling connection of the upper nozzle arm connecting sleeve 130 to the lower nozzle arm upper connecting sleeve 220 is also achieved by the first balls 330 and the first outer sleeve 310, i.e., the first intermediate sleeve 370 and the first inner sleeve 320 are eliminated from the embodiment of fig. 14 as described above, and the first balls 330 directly engage the lower nozzle arm upper connecting sleeve 220 and the first outer sleeve 310. At this time, the outer circumferential surface of the lower spray arm upper connection sleeve 220 is provided with a lower spray arm ball groove adapted to be engaged with the first ball 330, and the inner circumferential surface of the first outer sleeve 310 is provided with a first outer sleeve ball groove 313 adapted to be engaged with the first ball 330.

For example, in an embodiment in which the fourth is not shown, the first ball assembly 300 may include only: the rolling connection of the upper spray arm connecting sleeve 130 to the lower spray arm upper connecting sleeve 220 is also achieved by the first balls 330, the first inner sleeve 320 and the first outer sleeve 310, i.e. the first intermediate sleeve 370 is eliminated in comparison to the embodiment of fig. 14 described above, and the first balls 330 directly engage the first inner sleeve 320 and the first outer sleeve 310. At this time, the first outer sleeve 310 may be in interference fit with the upper spray arm connecting sleeve 130, and the first inner sleeve 320 may be in interference fit with the lower spray arm upper connecting sleeve 220. The first outer sleeve 310 is provided at an inner circumferential surface thereof with a first outer sleeve ball groove 313 adapted to be engaged with the first ball 330, and the first inner sleeve 320 is provided at an outer circumferential surface thereof with a first inner sleeve ball groove 321 adapted to be engaged with the first ball 330.

For example, in an embodiment in which the fifth is not shown, the first ball assembly 300 may include only: the rolling connection of the upper and lower spray

arm connection sleeves

130 and 220 is also achieved by the first balls 330 and the first intermediate sleeve 370, i.e., the first inner sleeve 320 and the first outer sleeve 310 are eliminated from the embodiment of fig. 14, as described above, and the first balls 330 directly engage the upper and lower spray

arm connection sleeves

For example, in an embodiment wherein the sixth is not shown, the first ball assembly 300 may comprise only: the rolling connection of the upper spray arm connecting sleeve 130 to the lower spray arm upper connecting sleeve 220 is also achieved by the first balls 330, the first inner sleeve 320 and the first intermediate sleeve 370, i.e. the first outer sleeve 310 is reduced compared to the embodiment of fig. 14 described above, and the first balls 330 directly engage the first inner sleeve 320 and the upper spray arm connecting sleeve 130. At this time, an inner circumferential surface of the upper spray arm connecting sleeve 130 is provided with an upper spray arm ball groove adapted to be engaged with the first ball 330, and an outer circumferential surface of the first inner sleeve 320 is provided with a first inner sleeve ball groove 321 adapted to be engaged with the first ball 330.

For example, in an embodiment in which the seventh is not shown, the first ball assembly 300 may include only: the rolling connection of the upper nozzle arm connecting sleeve 130 to the lower nozzle arm upper connecting sleeve 220 is also achieved by the first balls 330, the first outer sleeve 310 and the first intermediate sleeve 370, i.e., the first inner sleeve 320 is eliminated as compared to the embodiment of fig. 14 described above, and the first balls 330 directly engage the lower nozzle arm upper connecting sleeve 220 and the first outer sleeve 310. At this time, the outer circumferential surface of the lower spray arm upper connection sleeve 220 is provided with a lower spray arm ball groove adapted to be engaged with the first ball 330, and the inner circumferential surface of the first outer sleeve 310 is provided with a first outer sleeve ball groove 313 adapted to be engaged with the first ball 330.

Of course, in some embodiments not shown, the lower spray arm upper connection sleeve 220 may also be sleeved outside the upper spray arm connection sleeve 130, at this time, the inside of the first ball assembly 300 is matched with the upper spray arm connection sleeve 130, the outside of the first ball assembly 300 is matched with the lower spray arm upper connection sleeve 220, and the case where the lower spray arm upper connection sleeve 220 is sleeved inside the upper spray arm connection sleeve 130 is similar to the above seven embodiments, and is not described again here.

Based on the embodiment of fig. 5 and 15, the second ball assembly 400 of the present invention can have various modifications, and the modifications fall into the scope of the present invention. A plurality of modifications of the second ball assembly 400 according to the embodiment of the present invention will be summarized below with reference to fig. 5 and 15.

For example, in a first embodiment, not shown, the second ball assembly 400 may include only: the rolling connection of the lower spray arm lower connection sleeve 240 and the spray arm base body 510 can also be achieved by the second balls 430, i.e., the second intermediate sleeve 470, the second inner sleeve 420 and the second outer sleeve 410 are reduced as compared to the embodiment of fig. 15 described above, and the second balls 430 are directly engaged with the lower spray arm lower connection sleeve 240 and the spray arm base body 510. At this time, an upper spray arm ball groove adapted to be engaged with the second ball 430 is formed on an inner circumferential surface of the lower spray arm lower connection sleeve 240, and a lower spray arm ball groove adapted to be engaged with the second ball 430 is formed on an outer circumferential surface of the spray arm socket body 510.

For example, in a second embodiment, not shown, the second ball assembly 400 may include only: the rolling connection of the lower boom lower connection sleeve 240 and the boom seat body 510 is also achieved by the second balls 430 and the second inner sleeve 420, i.e., the second intermediate sleeve 470 and the second outer sleeve 410 are reduced as compared to the embodiment of fig. 15 described above, with the second balls 430 directly engaging the second inner sleeve 420 and the lower boom lower connection sleeve 240. At this time, an inner circumferential surface of the lower spray arm lower connection sleeve 240 is provided with an upper spray arm ball groove adapted to be engaged with the second ball 430, and an outer circumferential surface of the second inner sleeve 420 is provided with a second inner sleeve ball groove 421 adapted to be engaged with the second ball 430.

For example, in a third embodiment, not shown, the second ball assembly 400 may include only: the rolling connection of the lower spray arm lower connection sleeve 240 and the spray arm socket body 510 is also achieved by the second balls 430 and the second outer sleeve 410, i.e., the second intermediate sleeve 470 and the second inner sleeve 420 are reduced as compared to the embodiment of fig. 15 described above, with the second balls 430 directly engaging the spray arm socket body 510 and the second outer sleeve 410. At this time, a lower spray arm ball groove adapted to be engaged with the second ball 430 is formed on the outer circumferential surface of the spray arm socket body 510, and a second outer sleeve ball groove 413 adapted to be engaged with the second ball 430 is formed on the inner circumferential surface of the second outer sleeve 410.

For example, in an embodiment wherein the fourth is not shown, the second ball assembly 400 may include only: the rolling connection of the lower spray arm lower connection sleeve 240 and the spray arm base body 510 can also be achieved by the second balls 430, the second inner sleeve 420 and the second outer sleeve 410, i.e., the second intermediate sleeve 470 is reduced compared to the embodiment of fig. 15, and the second balls 430 are directly engaged with the second inner sleeve 420 and the second outer sleeve 410. At this time, the second outer sleeve 410 may be in interference fit with the lower spray arm lower connection sleeve 240, and the second inner sleeve 420 may be in interference fit with the spray arm base body 510. The second outer sleeve 410 is provided at an inner circumferential surface thereof with a second outer sleeve ball groove 413 adapted to be engaged with the second balls 430, and the second inner sleeve 420 is provided at an outer circumferential surface thereof with a second inner sleeve ball groove 421 adapted to be engaged with the second balls 430.

For example, in an embodiment wherein the fifth is not shown, the second ball assembly 400 may include only: the rolling connection of the lower boom lower connection sleeve 240 and the nozzle arm base body 510 is also achieved by the second balls 430 and the second intermediate sleeve 470, i.e., the second inner sleeve 420 and the second outer sleeve 410 are reduced as compared to the embodiment of fig. 15 described above, with the second balls 430 directly engaging the lower boom lower connection sleeve 240 and the nozzle arm base body 510. At this time, an upper spray arm ball groove adapted to be engaged with the second ball 430 is formed on an inner circumferential surface of the lower spray arm lower connection sleeve 240, and a lower spray arm ball groove adapted to be engaged with the second ball 430 is formed on an outer circumferential surface of the spray arm socket body 510.

For example, in an embodiment wherein the sixth is not shown, the second ball assembly 400 may only include: the rolling connection of lower spray arm lower coupling sleeve 240 to spray arm base body 510 is also achieved by the second balls 430, second inner sleeve 420 and second intermediate sleeve 470, i.e., the second outer sleeve 410 is eliminated as compared to the embodiment of fig. 15 described above, and the second balls 430 directly engage with the second inner sleeve 420 and lower spray arm lower coupling sleeve 240. At this time, an inner circumferential surface of the lower spray arm lower connection sleeve 240 is provided with an upper spray arm ball groove adapted to be engaged with the second ball 430, and an outer circumferential surface of the second inner sleeve 420 is provided with a second inner sleeve ball groove 421 adapted to be engaged with the second ball 430.

For example, in an embodiment wherein the seventh is not shown, the second ball assembly 400 may include only: the rolling connection of the lower spray arm lower connection sleeve 240 and the spray arm socket body 510 is also achieved by the second balls 430, the second outer sleeve 410 and the second intermediate sleeve 470, i.e., the second inner sleeve 420 is reduced as compared to the embodiment of fig. 15 described above, with the second balls 430 directly engaging the spray arm socket body 510 and the second outer sleeve 410. At this time, a lower spray arm ball groove adapted to be engaged with the second ball 430 is formed on the outer circumferential surface of the spray arm socket body 510, and a second outer sleeve ball groove 413 adapted to be engaged with the second ball 430 is formed on the inner circumferential surface of the second outer sleeve 410.

Of course, in some embodiments not shown, the spray arm seat body 510 may also be sleeved outside the lower spray arm lower connection sleeve 240, at this time, the inside of the second ball assembly 400 is matched with the lower spray arm lower connection sleeve 240, the outside of the second ball assembly 400 is matched with the spray arm seat body 510, and the case that the spray arm seat body 510 is sleeved inside the lower spray arm lower connection sleeve 240 is similar to the above seven embodiments, and is not described again here.

It should be noted that, in the present invention, the up-down position relationship between the upper spray arm 100 and the lower spray arm 200 is described based on the example of the spray arm being installed on the bottom wall of the dishwasher, but in some embodiments not shown, the spray arm may also be installed on the top wall or the side wall of the dishwasher, when the spray arm is installed on the top wall of the dishwasher, the upper spray arm 100 is located below the lower spray arm 200, when the spray arm is installed on the side wall of the dishwasher, the upper spray arm 100 is located on the side of the lower spray arm 200 away from the side wall of the dishwasher, that is, no matter where the spray arm is installed on the dishwasher, the upper spray arm 100 is always located on the side of the lower spray arm 200 facing the internal cavity of the dishwasher.

The washing appliance according to another aspect of the present invention includes the spray arm assembly 1000 of the above embodiment. The washing electric appliance can be a dish washer, and can also be the washing electric appliances that have washing functions such as fruit and vegetable cleaning machine, medical cleaning machine, and its effect is similar with the effect of setting up spray arm subassembly 1000 in the dish washer, and the repeated description is no longer given here.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A spray arm assembly, comprising:

a spray arm, the spray arm comprising: the upper spray arm is connected with the lower spray arm and is positioned above the lower spray arm, the upper spray arm can rotate relative to the lower spray arm, and a first ball assembly is arranged at the connection matching position of the upper spray arm and the lower spray arm;

the spray arm is connected with the spray arm seat, and the spray arm can rotate relative to the spray arm seat;

and the second ball assembly is arranged at the connecting and matching part of the spray arm and the spray arm seat.

2. The spray arm assembly of claim 1 wherein the lower spray arm comprises: spout the arm and go up adapter sleeve, spout the arm body down, it sets up to spout the arm on the arm down the upside of spouting the arm body down, it includes to go up the spray arm: go up spray arm body and spray arm adapter sleeve, it sets up to go up spray arm adapter sleeve the downside of spray arm body, first ball subassembly sets up spray arm adapter sleeve with the connection cooperation department of adapter sleeve on the spray arm down.

3. The spray arm assembly of claim 2 wherein the first ball assembly and the second ball assembly each comprise at least: the ball of the first ball assembly is arranged at the connection and matching position of the upper spray arm connecting sleeve and the lower spray arm upper connecting sleeve, and the ball of the second ball assembly is arranged at the connection and matching position of the lower spray arm and the spray arm seat.

4. The spray arm assembly of claim 3 wherein the first ball assembly and the second ball assembly each further comprise: the ball bearing structure comprises an intermediate sleeve, wherein a plurality of ball holes are formed in the intermediate sleeve, balls are installed in the ball holes, and the balls protrude from the inner circumferential surface and the outer circumferential surface of the intermediate sleeve in the radial direction of the intermediate sleeve.

5. The spray arm assembly of claim 3 or 4 wherein the first ball assembly and the second ball assembly each further comprise: the inner sleeve is arranged on the inner side of the ball, and an inner sleeve ball groove suitable for being matched with the ball is formed in the outer peripheral surface of the inner sleeve.

6. The spray arm assembly of claim 5 wherein the first ball assembly and the second ball assembly each further comprise: the outer sleeve is arranged on the outer side of the ball, and an outer sleeve ball groove suitable for being matched with the ball is formed in the inner circumferential surface of the outer sleeve.

7. The spray arm assembly of claim 3 or 4 wherein the first ball assembly and the second ball assembly each further comprise: the outer sleeve is arranged on the outer side of the ball, and an outer sleeve ball groove suitable for being matched with the ball is formed in the inner circumferential surface of the outer sleeve.

8. The spray arm assembly of claim 5 wherein said lower spray arm is removably attached to said upper spray arm.

9. The spray arm assembly of claim 8 wherein the lower spray arm upper connector sleeve has a lower spray arm catch on top thereof, the lower spray arm catch adapted to catch on an upper surface of the inner sleeve of the first ball assembly.

10. The spray arm assembly of claim 8 wherein said inner sleeve of said first ball assembly has inner sleeve threads and said lower spray arm upper connection sleeve has lower spray arm upper threads threadably engaged with said inner sleeve threads.

11. The spray arm assembly of claim 5 wherein said upper connection sleeve of said lower spray arm is an interference fit with said inner sleeve of said first ball assembly.

12. The spray arm assembly of claim 6 wherein said upper spray arm connection sleeve is an interference fit with said outer sleeve of said first ball assembly; or

13. The spray arm assembly of claim 5 wherein said lower spray arm is removably attached to said spray arm base.

14. The spray arm assembly of claim 13, wherein the spray arm socket comprises: the spray arm seat comprises a spray arm seat body, wherein a spray arm seat buckle is arranged at the top of the spray arm seat body and is suitable for being clamped at the top end of the inner sleeve of the second ball assembly.

15. The spray arm assembly of claim 13 wherein the inner sleeve of the second ball assembly has inner sleeve threads and the spray arm socket has spray arm socket threads that threadably engage the inner sleeve threads.

16. The spray arm assembly of claim 5 wherein the spray arm socket is an interference fit with the inner sleeve of the second ball assembly.

17. The spray arm assembly of claim 6 wherein said lower spray arm lower adapter sleeve is an interference fit with said outer sleeve of said second ball assembly; or

18. The spray arm assembly of claim 2 wherein the length of the upper spray arm body is 0.5-2 times the length of the lower spray arm body.

19. Washing appliance, characterized in that it comprises a spray arm assembly according to any one of claims 1-18.