Washing electric appliance

Abstract

The invention discloses a washing electric appliance. The washing electric appliance comprises spraying arms, the spraying arms comprise a lower spraying arm and an upper spraying arm, the upper spraying arm is connected with the lower spraying arm and located above the lower spraying arm, the upper spraying arm can rotate relative to the lower spraying arm, and a first ball assembly is arranged at the connecting and matching position of the upper spraying arm and the lower spraying arm; the gushing arm is connected with the gushing arm seat, and the gushing arm can rotate relative to the gushing arm seat; and the second ball assembly is arranged at the connecting and matching position of the spraying arm and the spraying arm seat. According to the washing electric appliance, the washing effect is good, friction between the upper spraying arm and the lower spraying arm and friction between the spraying arm and the spraying arm base are small, and therefore the rotating stability of the spraying arms is improved.

Description

[0001] This case is a divisional application of application number 201810989072.1, application date August 28, 2018, and invention name “Spray arm assembly and washing appliance having the same” Technical Field

[0002] The present invention relates to the field of household appliances, and in particular to a washing appliance. Background Art

[0003] The current washing machine spray arms are prone to produce dead corners during the cleaning process. For example, the position design of the dishwasher's bowl basket and spray arm are well matched. The existing bowl basket design is mostly based on the standard tableware design for the Chinese domestic market. When consumers actually use it at home, if the size, placement, and direction of the tableware are different from the standard tableware size and placement, it is easy to cause the dishwasher to not clean thoroughly during operation, causing user pain points. In order to improve the cleaning ability, some dishwashers use satellite spray arms or WaterWalls, but the structure of satellite spray arms or WaterWalls is complex and costly, which is not conducive to promotion and application.

[0004] In addition, the main way to connect the spray arm to the spray arm seat is through a snap-fit ​​connection with a snap-fit ​​flange, but this connection method will result in a larger gap between the spray arm and the spray arm seat. When the dishwasher is working, the water in the spray arm is easy to leak through the gap, affecting the cleaning effect. In addition, when the spray arm and the spray arm seat produce relative motion, the friction between the two is sliding friction, so the loss of water power is relatively large. On the other hand, the snap-fit ​​connection method directly leads to a larger upper and lower height dimension of the spray arm seat and the spray arm, which wastes the inner tank space of the washing appliance and reduces the placement space of the parts to be cleaned inside the washing appliance. Summary of the invention

[0005] The present invention aims to solve at least one of the above technical problems in the prior art to a certain extent. To this end, the present invention provides a washing appliance that can reduce the friction inside the spray arm and the friction between the spray arm and the spray arm seat.

[0006] A washing appliance according to an embodiment of the present invention comprises: a spray arm, wherein the spray arm comprises: a lower spray arm and an upper spray arm, wherein the upper spray arm is connected to the lower spray arm and is located above the lower spray arm, the upper spray arm is rotatable relative to the lower spray arm, and a first ball assembly is provided at the connection between the upper spray arm and the lower spray arm; a spray arm seat, wherein the spray arm is connected to the spray arm seat and the spray arm is rotatable relative to the spray arm seat; and a second ball assembly, wherein the second ball assembly is provided at the connection between the spray arm and the spray arm seat.

[0007] According to the washing appliance of the embodiment of the present invention, by setting the lower spray arm and the upper spray arm, the number of spray arms is increased, which is conducive to enhancing the cleaning effect of the spray arm on the tableware. In addition, by setting the first ball assembly between the upper spray arm and the lower spray arm, the upper spray arm and the lower spray arm are in rolling contact, thereby reducing the friction between the upper spray arm and the lower spray arm, thereby reducing the loss of water power, improving the utilization rate of water power, and improving the cleaning effect of the washing appliance on the parts to be cleaned. At the same time, the upper spray arm and the lower spray arm are connected by the first ball assembly, which can effectively reduce the height of the spray arm. In addition, by setting the second ball assembly between the spray arm and the spray arm seat, the spray arm and the spray arm seat are in rolling contact, thereby reducing the friction between the spray arm and the spray arm seat, thereby further reducing the loss of water power, improving the cleaning effect of the washing appliance on the parts to be cleaned, and effectively reducing the height of the washing appliance, thereby saving the internal space of the washing appliance, leaving more space for the placement of the parts to be cleaned, and improving the capacity of the washing appliance.

[0008] According to some embodiments of the present invention, the lower spray arm comprises: a lower spray arm upper connecting sleeve and a lower spray arm body, the lower spray arm upper connecting sleeve is arranged on the upper side of the lower spray arm body, the upper spray arm comprises: an upper spray arm body and an upper spray arm connecting sleeve, the upper spray arm connecting sleeve is arranged on the lower side of the upper spray arm body, and the first ball assembly is arranged at the connection between the upper spray arm connecting sleeve and the lower spray arm upper connecting sleeve.

[0009] According to some embodiments of the present invention, the first ball assembly and the second ball assembly each include at least: a plurality of balls, the plurality of balls of the first ball assembly are arranged at the connection between the upper spray arm connecting sleeve and the lower spray arm upper connecting sleeve, and the plurality of balls of the second ball assembly are arranged at the connection between the lower spray arm and the spray arm seat.

[0010] Furthermore, the first ball assembly and the second ball assembly also include: an intermediate sleeve, the intermediate sleeve is provided with a plurality of ball holes, the balls are installed in the ball holes, and the balls protrude from the inner circumference and outer circumference of the intermediate sleeve in the radial direction of the intermediate sleeve.

[0011] Optionally, the first ball assembly and the second ball assembly each further include:

[0012] The inner sleeve is arranged on the inner side of the ball, and the outer peripheral surface of the inner sleeve is provided with an inner sleeve ball groove suitable for cooperating with the ball.

[0013] Furthermore, the first ball assembly and the second ball assembly each further include an outer sleeve, the outer sleeve being arranged on the outside of the ball, and an outer sleeve ball groove suitable for cooperating with the ball being arranged on the inner circumferential surface of the outer sleeve.

[0014] According to some embodiments of the present invention, the first ball assembly and the second ball assembly also include: an outer sleeve, which is arranged on the outside of the ball and has an outer sleeve ball groove suitable for cooperating with the ball on the inner circumferential surface of the outer sleeve.

[0015] According to some embodiments of the present invention, the lower spray arm and the upper spray arm are detachably connected.

[0016] Optionally, a lower spray arm buckle is provided on the top of the upper connecting sleeve of the lower spray arm, and the lower spray arm buckle is suitable for being clamped on the upper surface of the inner sleeve of the first ball assembly.

[0017] Optionally, the inner sleeve of the first ball assembly has an inner sleeve thread, the lower spray arm upper connecting sleeve has a lower spray arm upper thread, and the lower spray arm upper thread is threadedly connected to the inner sleeve thread.

[0018] According to some embodiments of the present invention, there is an interference fit between the upper connecting sleeve of the lower spray arm and the inner sleeve of the first ball assembly.

[0019] According to some embodiments of the present invention, the upper spray arm connecting sleeve and the outer sleeve of the first ball assembly are in interference fit; or

[0020] The outer sleeve of the first ball assembly has an outer sleeve thread, the upper spray arm connecting sleeve has an upper spray arm thread, and the upper spray arm thread is threadedly connected with the outer sleeve thread.

[0021] According to some embodiments of the present invention, the lower spray arm and the spray arm seat are detachably connected.

[0022] Optionally, the spray arm seat comprises: a spray arm seat body, the top of the spray arm seat body is provided with a spray arm seat buckle, and the spray arm seat buckle is suitable for being clamped on the top end of the inner sleeve of the second ball assembly.

[0023] Optionally, the inner sleeve of the second ball assembly has an inner sleeve thread, the spray arm seat has a spray arm seat thread, and the spray arm seat thread is threadedly connected to the inner sleeve thread.

[0024] According to some embodiments of the present invention, an interference fit is formed between the spray arm seat and the inner sleeve of the second ball assembly.

[0025] According to some embodiments of the present invention, there is an interference fit between the lower connecting sleeve of the lower spray arm and the outer sleeve of the second ball assembly; or

[0026] The outer sleeve of the second ball assembly has an outer sleeve thread, and the lower connecting sleeve of the lower spray arm has a lower spray arm lower thread, and the lower spray arm lower thread is threadedly connected with the outer sleeve thread.

[0027] According to some embodiments of the present invention, the length of the upper spray arm body is 0.5-2 times the length of the lower spray arm body. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 1 is a three-dimensional schematic diagram of a washing appliance according to a first embodiment of the present invention (the angle between the upper spray arm and the lower spray arm is 0°);

[0029] Figure 2 1 is a three-dimensional schematic diagram of a washing appliance according to a first embodiment of the present invention (the angle between the upper spray arm and the lower spray arm is 90°);

[0030] Figure 3 1 is a top view of the washing appliance of the first embodiment of the present invention (the angle between the upper spray arm and the lower spray arm is 0°);

[0031] Figure 4 is a cross-sectional view of a washing appliance according to a first embodiment of the present invention;

[0032] Figure 5 yes Figure 4 A local enlarged schematic diagram of the A in FIG. Figure 6 It is an exploded view of a washing appliance;

[0033] Figure 7 yes Figure 6 A local enlarged schematic diagram of point B in FIG. Figure 8 yes Figure 6 A local enlarged schematic diagram of point C in FIG.

[0034] Fig. 9 is a schematic diagram of a washing appliance according to a second embodiment of the present invention;

[0035] Fig.10 is a schematic diagram of a washing appliance according to a third embodiment of the present invention;

[0036] Fig.11 is a schematic diagram of a second driving protrusion; Fig.12 is a schematic diagram of a first driving protrusion;

[0037] Fig.13 is a schematic diagram of a first intermediate sleeve; Fig.14 is a schematic diagram of a variation of the first ball assembly;

[0038] Fig.15 It is a schematic diagram of a modified example of the second ball assembly.

[0039] Reference numerals:

[0040] Washing appliance 1000; upper spray arm 100, second drive protrusion 110, second drive hole 111, upper spray arm body 120, upper spray arm connecting sleeve 130, upper spray arm ball groove 131, upper chamber 140, upper water spray hole 160; lower spray arm 200, first drive protrusion 210, first drive hole 211, lower spray arm upper connecting sleeve 220, lower spray arm body 230, lower spray arm lower connecting sleeve 240, connecting The peripheral wall 241 of the connecting sleeve, the bottom wall 242 of the connecting sleeve, the ball groove 243 of the lower spray arm, the lower chamber 250, the lower water spray hole 260, the lower spray arm buckle 270, and the lower spray arm thread 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, and the first ball taking and releasing port 3 51, the first weakened groove 360, the first weakened groove column 361, the first intermediate sleeve 370; the second ball assembly 400, the second outer sleeve 410, the second outer sleeve peripheral wall 411, the second outer sleeve bottom wall 412, the second outer sleeve ball groove 413, the second outer sleeve internal thread 414, the second outer sleeve external thread 415, the second inner sleeve 420, the second inner sleeve ball groove 421, the second inner sleeve external thread 422, the second ball 430, the second ball hole 450, the second ball taking and releasing port 451, the second weakened groove 460, the second weakened groove column 461, the second intermediate sleeve 470; the spray arm seat 500, the spray arm seat body 510, the spray arm seat buckle 511, the spray arm seat flange 520, the spray arm seat internal thread 530, the spray arm seat water inlet shaft 540, the spray arm seat ball groove 570, and the spray arm seat chamber 580. DETAILED DESCRIPTION

[0041] Embodiments of the present invention are described below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection or an integrated connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Combine the following Figure 1-Figure 15 The washing machine 1000 according to the embodiment of the present invention is described in detail. The structure of the washing machine 1000 is described below by taking a dishwasher as an example.

[0044] Reference Figure 1As shown, the washing appliance 1000 according to the embodiment of the present invention may include: a spray arm, a first ball assembly 300, a spray arm seat 500 and a second ball assembly 400. Specifically, the spray arm may include: a lower spray arm 200 and an upper spray arm 100, wherein the upper spray arm 100 is connected to the lower spray arm 200 and is located above the lower spray arm 200, and the upper spray arm 100 is rotatable relative to the lower spray arm 200, and an upper spray hole 160 for spraying water into the dishwasher is provided on the upper spray arm 100, and a lower spray hole 260 for spraying water into the dishwasher is provided on the lower spray arm 200, and when the water sprayed from the upper spray hole 160 and the lower spray hole 260 falls on the tableware, the tableware can be cleaned. By arranging the upper spray arm 100 above the lower spray arm 200, the number of spray arms is increased, thereby increasing the amount of water sprayed by the spray arm, which is conducive to enhancing the cleaning effect of the spray arm on the tableware.

[0045] 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 the water column inside the spray arm is sprayed out from the first driving hole 211, the lower spray arm 200 will be subjected to a reaction force (i.e., a reverse driving force) when the water column is sprayed out from the first driving hole 211. At this time, the lower spray arm 200 will 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. As the water column is continuously sprayed out from the first driving hole 211, the lower spray arm 200 can rotate continuously, and the water column sprayed from the first driving hole 211 will be sprayed around as the lower spray arm 200 rotates, and the water flow sprayed from the lower water spray hole 260 of the lower spray arm 200 also enters the working area of ​​the dishwasher, and then the two cooperate to clean the tableware in the dishwasher or the stains on the inner wall of the dishwasher.

[0046] The upper spray arm 100 is provided with a second driving hole 111 for driving the upper spray arm 100 to rotate around a second direction. When the water column is sprayed from the second driving hole 111, the upper spray arm 100 will be subjected to the reaction force when the water column is sprayed from the second driving hole 111. At this time, the upper spray arm 100 will 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. As the water column is continuously sprayed from the second driving hole 111, the upper spray arm 100 can rotate continuously, and when the upper spray arm 100 rotates, the water column sprayed from the second driving hole 111 is sprayed around, and the water flow sprayed from the upper water spray hole 160 of the upper spray arm 100 also enters the working area of ​​the dishwasher. The upper spray arm 100 and the lower spray arm 200 cooperate to clean the tableware in the dishwasher or the stains on the inner wall of the dishwasher.

[0047] It should be noted that 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. When the water column is sprayed from the first drive hole 211 of the lower spray arm 200 and the second drive hole 111 of the upper spray arm 100 at the same time, the lower spray arm 200 and the upper spray arm 100 rotate at the same time, and the directions of rotation of the two are opposite (for example, refer to Figure 1-Figure 3 As shown, the lower spray arm 200 can rotate counterclockwise and the upper spray arm 100 can rotate clockwise. Of course, the lower spray arm 200 can also rotate clockwise and the upper spray arm 100 can rotate counterclockwise). At this time, the water columns 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. When the water columns sprayed from the first driving hole 211 and the second driving hole 111 fall on the tableware or the inner wall of the dishwasher at the same time, the cleaning directions of the sprayed water columns after they hit the tableware or the inner wall of the dishwasher are inconsistent, so that the water columns sprayed from the first driving hole 211 and the second driving hole 111 generate rubbing force on the inner wall of the tableware or the dishwasher, thereby enhancing the cleaning effect of the spray arm, and ensuring that the tableware or the inner wall of the dishwasher are 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 hole 160 of the upper spray arm 100 and the water sprayed from the lower spray hole 260 of the lower spray arm 200 can generate a rubbing force on the tableware, thereby improving the cleaning effect of the spray arm.

[0048] The direction and position of the water column sprayed onto the tableware by the upper spray arm 100 and the lower spray arm 200 are multi-directional, which reduces dead corners and makes it easier to clean. Since the water flow has a larger coverage rate, the cleaning time will be reduced accordingly, which is conducive to shortening the cleaning time.

[0049] The first ball assembly 300 is arranged at the connection and matching position between 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 instead of the previous sliding friction. This ensures that the friction force of the upper spray arm 100 when rotating relative to the lower spray arm 200 is small, that is, the rolling friction force has little resistance to the rotation of the spray arm, so the water power loss caused by friction can be reduced and the utilization rate of the water power can be improved. At the same time, the upper spray arm 100 rotates at a faster speed relative to the lower spray arm 200. By setting the first ball assembly 300, it is beneficial to improve the smoothness of the upper spray arm 100 and the lower spray arm 200 when rotating relative to each other, thereby helping to reduce the noise of the dishwasher.

[0050] In addition, the first ball assembly 300 is arranged between the upper spray arm 100 and the lower spray arm 200 to connect the upper spray arm 100 and the lower spray arm 200 as a whole. Compared with the original form in which the upper spray arm 100 and the lower spray arm 200 are separately connected by a snap-fit, the height of the connection between the upper spray arm 100 and the lower spray arm 200 can be effectively reduced, thereby reducing the height dimension of the spray arm, saving the internal space of the dishwasher, leaving more space for the placement of tableware, and thus increasing the tableware capacity of the dishwasher. For example, the internal loading capacity of the dishwasher can be increased by 10mm-40mm.

[0051] The spray arm is connected to the spray arm seat 500, which is located below the spray arm and is rotatable relative to the spray arm seat 500. The spray arm seat 500 provides an interface for connecting the spray arm to the inner tank of the dishwasher. At the same time, the spray arm seat 500 can also serve as a water inlet pipe for the spray arm. When the water source of the dishwasher is connected, water flows from the spray arm seat 500 into the spray arm. Specifically, the spray arm seat 500 is connected to the lower spray arm 200.

[0052] 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 water spray hole 260 and the first drive hole 211, and the lower spray arm 200 rotates around the first direction due to the reaction force when the water column is sprayed out. When the water pressure in the upper spray arm 100 reaches a certain value, the upper spray arm 100 starts to spray water columns through the upper water spray hole 160 and the second drive hole 111, and the upper spray arm 100 rotates around the second direction due to the reaction force when the water column is sprayed out. As the water column is continuously sprayed out from the water spray hole and the drive hole, the lower spray arm 200 and the upper spray arm 100 can rotate continuously, and the water columns sprayed from the water spray hole and the drive hole will be sprinkled onto the surface of the tableware or the inner wall of the dishwasher as the spray arm rotates, thereby cleaning the stains on the tableware or the inner wall of the dishwasher, thereby completing the dishwasher's cleaning work on the tableware.

[0053] The second ball assembly 400 is disposed at the connection and cooperation between the spray arm and the spray arm seat 500. Figure 4 As shown, the lower spray arm 200 and the spray arm seat 500 are indirectly connected through the second ball assembly 400. When the spray arm rotates relative to the spray arm seat 500, the friction between the spray arm and the spray arm seat 500 is rolling friction instead of sliding friction. In this way, the rolling friction has little resistance to the rotation of the spray arm, so the water power loss caused by friction can be reduced and the utilization rate of water power can be improved. At the same time, the spray arm rotates at a faster speed relative to the spray arm seat 500. By setting the second ball assembly 400, it is beneficial to improve the smoothness of the spray arm when rotating, thereby helping to reduce the noise of the dishwasher.

[0054] In addition, the second ball assembly 400 is arranged between the spray arm and the spray arm seat 500, connecting the spray arm and the spray arm seat 500 as a whole. Compared with the original form in which the spray arm and the spray arm seat 500 are separately connected by a snap-fit, the height of the connection between the spray arm and the spray arm seat 500 can be effectively reduced, thereby reducing the height dimension of the washing appliance 1000, saving the internal space of the dishwasher, leaving more space for the placement of tableware, and thus increasing the tableware capacity of the dishwasher. For example, the internal loading capacity of the dishwasher can be increased by 10mm-40mm.

[0055] According to the washing appliance 1000 of the embodiment of the present invention, the number of spray arms is increased by providing a lower spray arm 200 and an upper spray arm 100, which is beneficial to enhancing the cleaning effect of the spray arms on tableware, and a first driving hole 211 is provided on the lower spray arm 200, and a second driving hole 111 is provided on the upper spray arm 100, which can ensure that the upper spray arm 100 rotates in the opposite direction relative to the lower spray arm 200, so that the water columns sprayed from the lower spray arm 200 and the upper spray arm 100 generate a rubbing force on the tableware, thereby enhancing the cleaning effect of the spray arm, and ensuring that the tableware is cleaned. In addition, by setting the first ball assembly 300 between the upper spray arm 100 and the lower spray arm 200, the upper spray arm 100 and the lower spray arm 200 are in rolling contact, thereby reducing the friction between the upper spray arm 100 and the lower spray arm 200, thereby reducing the loss of hydrodynamic force, improving the utilization rate of hydrodynamic force, ensuring that the pressure of water when spraying out from the upper spray hole 160 and the lower spray hole 260 is relatively high, and is conducive to improving the cleaning effect of the dishwasher on tableware. In addition, by setting the spray arm seat 500, a connection interface is provided for the spray arm, and the spray arm seat 500 also serves as the water inlet pipeline of the spray arm. By setting the second ball assembly 400 between the spray arm and the spray arm seat 500, the spray arm and the spray arm seat 500 are in rolling contact, thereby reducing the friction between the spray arm and the spray arm seat 500, thereby reducing the loss of hydrodynamic force, improving the utilization rate of hydrodynamic force, ensuring that the pressure of water when spraying out from the spray arm spray hole is relatively high, and is conducive to improving the cleaning effect of the dishwasher on tableware. At the same time, the upper spray arm 100 and the lower spray arm 200 are connected by the first ball assembly 300, and the spray arm and the spray arm seat 500 are connected by the second ball assembly 400, which can effectively reduce the height of the washing appliance 1000, thereby saving the internal space of the dishwasher, leaving more space for placing tableware, and increasing the tableware capacity of the dishwasher.

[0056] In some embodiments of the present invention, the lower spray arm 200 may include: a lower spray arm upper connecting sleeve 220, a lower spray arm body 230 and a lower spray arm lower connecting sleeve 240. The lower spray arm upper connecting sleeve 220 is arranged on the upper side of the lower spray arm body 230, which facilitates the connection between the upper spray arm 100 and the lower spray arm 200, and ensures that the upper spray arm 100 and the lower spray arm 200 can be reliably connected as one. The lower spray arm lower connecting sleeve 240 is arranged on the lower side of the lower spray arm body 230, which facilitates the fixation of the lower spray arm 200 and the spray arm seat 500.

[0057] The lower spray arm upper connecting sleeve 220, the lower spray arm body 230 and the lower spray arm lower connecting sleeve 240 are connected as a whole, and the lower spray arm upper connecting sleeve 220 and the lower spray arm lower connecting sleeve 240 are both located in the middle of the lower spray arm body 230, which is conducive to ensuring the balance of the spray arm. Figure 4-Figure 5 As shown, the lower spray arm upper connecting sleeve 220, the lower spray arm body 230 and the lower spray arm lower connecting sleeve 240 have a connected lower chamber 250, and the first driving hole 211 is connected to the lower chamber 250. The lower spray arm upper connecting sleeve 220, the lower spray arm body 230 and the lower spray arm lower connecting sleeve 240 can all be hollow components, and the hollow positions of the three components together form the lower chamber 250, and the first driving hole 211 is connected to the hollow position of the lower spray arm body 230, so the first driving hole 211 is connected to the lower chamber 250.

[0058] The spray arm seat 500 has a spray arm seat chamber 580, which is connected to the lower chamber 250 to ensure that the water in the spray arm seat 500 can enter the lower spray arm 200. Further, the upper spray arm 100 may include: an upper spray arm body 120 and an upper spray arm connecting sleeve 130, and the upper spray arm connecting sleeve 130 is arranged on the lower side of the upper spray arm body 120, thereby facilitating the connection between the upper spray arm 100 and the lower spray arm 200, and ensuring that the upper spray arm 100 and the lower spray arm 200 can be reliably connected as one.

[0059] The upper spray arm body 120 and the upper spray arm connecting sleeve 130 have a connected upper chamber 140, the second driving hole 111 is connected to the upper chamber 140, and the upper chamber 140 is also connected to the lower chamber 250, thereby ensuring that water from the dishwasher water source can smoothly enter the upper chamber 140 through the spray arm seat chamber 580 and the lower chamber 250, and then the water is sprayed onto the surface of the tableware through the water spray hole and the driving hole on the spray arm, thereby completing the operation of washing the tableware. As water continues to enter the upper chamber 140 and the lower chamber 250, the water pressure in the upper chamber 140 and the lower chamber 250 becomes higher and higher. At this time, the reaction force generated by the water column sprayed from the first drive hole 211 and the second drive hole 111 becomes greater, and the upper spray arm 100 and the lower spray arm 200 rotate faster. At the same time, the force of the sprayed water column hitting the tableware becomes greater, which is conducive to cleaning the stains on the tableware. Therefore, by setting the upper chamber 140 and the lower chamber 250, sufficient water can be ensured and the washing effect of the dishwasher is better.

[0060] The first ball assembly 300 is disposed at the connection and matching position between the upper spray arm connection sleeve 130 and the lower spray arm upper connection sleeve 220, so that when the upper spray arm connection sleeve 130 and the lower spray arm upper connection sleeve 220 rotate relative to each other, the first ball assembly 300 can roll, thereby reducing the friction between the upper spray arm connection sleeve 130 and the lower spray arm upper connection sleeve 220. At the same time, after the upper spray arm connection sleeve 130 and the lower spray arm upper connection sleeve 220 are connected by the first ball assembly 300, the height dimensions of the upper spray arm connection sleeve 130 and the lower spray arm upper connection sleeve 220 can be reduced, thereby reducing the overall height dimension of the spray arm, leaving more space for placing tableware.

[0061] In some embodiments of the present invention, the first ball assembly 300 and the second ball assembly 400 each include at least: a plurality of balls, the plurality of balls of the first ball assembly 300 are arranged at the connection and cooperation between the upper spray arm connecting sleeve 130 and the lower spray arm upper connecting sleeve 220, and the plurality of balls of the second ball assembly 400 are arranged at the connection and cooperation between the lower spray arm 200 and the spray arm seat 500.

[0062] Furthermore, the first ball assembly 300 and the second ball assembly 400 also include: an intermediate sleeve, a plurality of ball holes are provided on the intermediate sleeve, balls are installed in the ball holes, and the balls protrude from the inner circumference and outer circumference of the intermediate sleeve in the radial direction of the intermediate sleeve.

[0063] Optionally, the first ball assembly 300 and the second ball assembly 400 both further include: an inner sleeve, which is arranged on the inner side of the ball, and an inner sleeve ball groove suitable for cooperating with the ball is arranged on the outer circumferential surface of the inner sleeve.

[0064] Furthermore, the first ball assembly 300 and the second ball assembly 400 also include: an outer sleeve, which is arranged on the outside of the ball, and an outer sleeve ball groove suitable for cooperating with the ball is arranged on the inner circumferential surface of the outer sleeve.

[0065] exist Figure 4-Figure 8 In the illustrated embodiment, any one of the first ball assembly 300 and the second ball assembly 400 includes: an intermediate sleeve, balls and an inner sleeve, the intermediate sleeve is provided with a plurality of ball holes, the balls are installed in the ball holes, and the balls protrude from the inner circumference and outer circumference of the intermediate sleeve in the radial direction of the intermediate sleeve, the inner sleeve is arranged on the inner side of the intermediate sleeve, and the outer circumference of the inner sleeve is provided with an inner sleeve ball groove suitable for cooperating with the balls.

[0066] Optionally, the diameter of the ball is 3mm-8mm, the number of balls in each ball assembly is 4-12, and preferably, the number of balls in each ball assembly is an even number, thereby ensuring that each ball assembly is subjected to balanced force and alleviating stress concentration.

[0067] Combine the following Figure 4-Figure 8 The structures of the first ball assembly 300 and the second ball assembly 400 are described in detail, and are described by taking the example that the upper spray arm connecting sleeve 130 is sleeved on the outer side of the lower spray arm upper connecting sleeve 220 and the lower spray arm lower connecting sleeve 240 is sleeved on the outer side of the spray arm seat 500.

[0068] Specifically, Figure 5-Figure 7 As shown, the first ball assembly 300 includes: a first intermediate sleeve 370, a first ball 330 and a first inner sleeve 320. The first inner sleeve 320 is arranged on the inner side of 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 installed in the first ball holes 350. The first ball holes 350 provide support for the fixation of the first balls 330, ensuring that the relative positions of the plurality of first balls 330 remain unchanged, preventing collision and extrusion between the plurality of first balls 330, thereby improving the working stability of the first ball assembly 300.

[0069] The first ball 330 is in rolling contact with the inner surface of the upper spray arm connecting sleeve 130, and the first ball 330 is in rolling contact with the outer surface of the first inner sleeve 320, at least a portion 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 to the lower spray arm upper connecting sleeve 220, therefore, the upper spray arm 100 and the lower spray arm 200 are indirectly connected through the first ball assembly 300, and the structure of the connection between the upper spray arm 100, the lower spray arm 200 and the first ball assembly 300 is simple and stable.

[0070] The first ball 330 protrudes from the inner circumference and the outer circumference of the first intermediate sleeve 370 in the radial direction of the first intermediate sleeve 370, that is, the diameter of the first ball 330 is greater than the wall thickness of the first intermediate sleeve 370, the outer side of the first ball 330 protrudes outward from the outer circumference of the first intermediate sleeve 370, and the inner side of the first ball 330 protrudes inward from the inner circumference of the first intermediate sleeve 370.

[0071] The outer circumferential surface of the first inner sleeve 320 is provided with a first inner sleeve ball groove 321 suitable for cooperating with the first ball 330, and the inner circumferential surface of the upper spray arm connecting sleeve 130 is provided with an upper spray arm ball groove 131 suitable for cooperating 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. Since the first inner sleeve 320 is fixedly connected to the lower spray arm upper connecting sleeve 220, when the lower spray arm 200 and the upper spray arm 100 rotate relatively, the upper spray arm connecting sleeve 130 and the lower spray arm upper connecting sleeve 220 are equivalent to rolling contact, and the friction force is small.

[0072] The upper spray arm ball groove 131 and the first inner sleeve ball groove 321 are both circumferential annular grooves, thereby ensuring the smoothness of the full rotation of the upper spray arm 100. In a specific embodiment, the diameter of the upper spray arm ball groove 131 and the first inner sleeve ball groove 321 can be equal to the diameter of the first ball 330, or can also be slightly larger than the diameter of the first ball 330, thereby ensuring that the first ball 330 cooperates well with the upper spray arm ball groove 131 and the first inner sleeve ball groove 321.

[0073] In the direction of the central axis 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 correspond to each other, which can prevent the first ball 330 from sliding along a trajectory different from the trajectory of the upper spray arm ball groove 131 and the first inner sleeve ball groove 321 when the upper spray arm 100 rotates, thereby preventing the first ball 330 from being squeezed and causing the upper spray arm 100 to be unable to rotate.

[0074] Optionally, the first ball hole 350 is disposed on the top of the first intermediate sleeve 370, referring to Fig.13 As shown, the first ball hole 350 is a major arc hole, and a first ball access opening 351 is formed at the top notch of the first ball hole 350. The first ball 330 enters the first ball hole 350 or comes out of the first ball hole 350 through the first ball access opening 351, thereby facilitating the installation and removal of the first ball 330 in the first ball hole 350.

[0075] The major arc hole is a hole with a central angle greater than 180° and less than 360°, so that most of each first ball 330 can be located in the first ball hole 350, preventing the first ball 330 from falling out of the first ball hole 350 after installation. When installing the first ball 330, the first ball access opening 351 can be opened with the help of external force, and then the first ball 330 is installed in the first ball hole 350 through the first ball access opening 351. Then, the external force is removed, and the elastic deformation of the first ball hole 350 disappears, and the first ball hole 350 returns to its original state. At this time, the first ball hole 350 tightly wraps the first ball 330, making the installation of the first ball 330 in the first ball hole 350 more secure and reliable.

[0076] Optionally, a first weakened groove 360 ​​is provided between two adjacent first ball holes 350. By providing the first weakened groove 360, the rigidity between the two adjacent first ball holes 350 can be reduced, so that when the first ball 330 is installed, the first ball hole 350 is easily deformed, thereby reducing the difficulty of installing or removing the first ball 330. A first weakened groove column 361 is provided in the first weakened groove 360, and the first weakened groove column 361 can play a certain strengthening role, thereby preventing the first weakened groove 360 ​​from excessively weakening the rigidity of the first intermediate sleeve 370, which is conducive to improving the working reliability of the first ball assembly 300.

[0077] In some embodiments not shown, the first ball hole 350 is disposed at the bottom of the first intermediate sleeve 370. Fig.13 As shown, the first ball hole 350 is a major arc hole, and a first ball taking and releasing opening 351 is formed at the bottom notch of the first ball hole 350 .

[0078] Of course, in other embodiments not shown, the first ball hole 350 may also be disposed in the middle position of the first intermediate sleeve 370 . In this case, the first ball hole 350 is a circular hole that penetrates the wall thickness of the first intermediate sleeve 370 .

[0079] In some embodiments, the lower spray arm 200 and the upper spray arm 100 are detachably connected.

[0080] Reference Figure 4-Figure 6 As shown, the top of the lower spray arm upper connecting sleeve 220 is provided with a lower spray arm buckle 270, and the lower spray arm buckle 270 is suitable for being clamped on the upper surface of the inner sleeve of the first ball assembly 300, that is, the lower spray arm buckle 270 is suitable for being clamped on the upper surface of the first inner sleeve 320. In this way, the lower spray arm 200 and the first inner sleeve 320 can be reliably connected as one, and the lower spray arm 200 and the upper spray arm 100 can be connected and disconnected conveniently, so as to facilitate the disassembly of the spray arm 1000.

[0081] The top of the lower spray arm upper connecting sleeve 220 has a plurality of lower spray arm grooves, the opening direction of the lower spray arm grooves is parallel to the axial direction of the lower spray arm upper connecting sleeve 220, the lower spray arm buckle 270 extends upward from the bottom wall of the lower spray arm groove, and the two sides of the lower spray arm buckle 270 are separated from the two side walls of the lower spray arm groove, thereby ensuring that the lower spray arm buckle 270 can be elastically deformed in the lower spray arm groove. The top of the lower spray arm buckle 270 is provided with a hook facing the first inner sleeve 320, and the hook is suitable for hooking on the top of the first inner sleeve 320, thereby limiting the relative axial position of the lower spray arm 200 and the first inner sleeve 320.

[0082] When the first inner sleeve 320 is assembled with the lower spray arm 200, the inner circumferential surface of the first inner sleeve 320 squeezes the hook of the lower spray arm buckle 270, so that the lower spray arm buckle 270 is deformed toward the inside of the lower spray arm upper connecting sleeve 220, ensuring that the lower spray arm buckle 270 can reach the top of the first inner sleeve 320 from the bottom end of the first inner sleeve 320 (i.e. from bottom to top). When the lower spray arm buckle 270 passes over the top of the first inner sleeve 320, the squeezing force on the lower spray arm buckle 270 disappears. Under the action of the elastic force of the lower spray arm buckle 270 itself, the lower spray arm buckle 270 approaches the first inner sleeve 320, so that the hook hooks the top of the first inner sleeve 320.

[0083] When the first inner sleeve 320 needs to be separated from the lower spray arm 200, the upper spray arm 100 is lifted upward with force. The top of the first inner sleeve 320 squeezes the hook so that the hook is retracted into the first inner sleeve 320. The upper spray arm 100 is then lifted to separate the first inner sleeve 320 from the lower spray arm 200.

[0084] The number of lower spray arm buckles 270 can be multiple (for example, four), the lower spray arm grooves correspond one-to-one to the lower spray arm buckles 270, and the multiple lower spray arm buckles 270 are evenly arranged along the circumference of the lower spray arm upper connecting sleeve 220, thereby improving the clamping stability of the lower spray arm buckle 270 and the first inner sleeve 320.

[0085] In addition to the above-mentioned clamping form, the detachable connection between the upper connecting sleeve 220 of the lower spray arm and the first inner sleeve 320 can also be connected by threading. For example, in some embodiments not shown, the first inner sleeve 320 of the first ball assembly 300 has an inner sleeve thread, and the upper connecting sleeve 220 of the lower spray arm has a lower spray arm upper thread, and the lower spray arm upper thread is screwed with the inner sleeve thread, so as to realize the detachable connection between the upper connecting sleeve 220 of the lower spray arm and the first inner sleeve 320. When the inner sleeve thread and the upper thread of the lower spray arm are loosened, the upper connecting sleeve 220 of the lower spray arm and the first inner sleeve 320 can be disassembled. The upper connecting sleeve 220 of the lower spray arm and the first inner sleeve 320 are connected by threads, which is convenient for assembly and disassembly and reliable for connection.

[0086] In some embodiments, Fig.14 As shown, there is an interference fit between the upper connecting sleeve 220 of the lower spray arm and the first inner sleeve 320 of the first ball assembly 300 .

[0087] In some embodiments, Fig.14 As shown, the upper spray arm connecting sleeve 130 and the first outer sleeve 310 of the first ball assembly 300 are in interference fit, thereby achieving the connection between the upper spray arm 100 and the first ball assembly 300; or

[0088] In some embodiments not shown, the first outer sleeve 310 of the first ball assembly 300 has an outer sleeve thread, and the upper spray arm connecting sleeve 130 has an upper spray arm thread, and the upper spray arm thread is threadedly connected to the outer sleeve thread, thereby realizing the connection between the upper spray arm 100 and the first ball assembly 300.

[0089] The second ball assembly 400 has a similar structure to the first ball assembly 300. Figure 5-Figure 6 , Figure 8 As shown, the second ball assembly 400 includes: a second intermediate sleeve 470, a second ball 430 and a second inner sleeve 420. The second intermediate 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 the fixation of the second balls 430, thereby ensuring that the relative positions of the plurality of second balls 430 remain unchanged and preventing collision and extrusion between the plurality of second balls 430, thereby improving the working stability of the first ball assembly 300. The second ball 430 protrudes from the inner and outer circumferences of the second intermediate sleeve 470 in the radial direction of the second intermediate sleeve 470, the second inner sleeve 420 is arranged on the inner side of the second intermediate sleeve 470, and the outer circumference of the second inner sleeve 420 is provided with a second inner sleeve ball groove 421 suitable for cooperating with the second ball 430, and the inner circumference of the lower connecting sleeve 240 of the lower spray arm is provided with a lower spray arm ball groove 243 suitable for cooperating with the second ball 430. When the lower spray arm 200 rotates relative to the spray arm seat 500, rolling contact occurs between the second ball 430 and the second inner sleeve ball groove 421 and the lower spray arm ball groove 243, and the friction force is small, which is beneficial to improving the stability of the spray arm rotation and reducing the noise of the washing appliance 1000.

[0090] The lower spray arm ball groove 243 and the second inner sleeve ball groove 421 are both circumferential annular grooves, thereby ensuring the smoothness of the full rotation of the lower spray arm 200. The diameter of the lower spray arm ball groove 243 and the second inner sleeve ball groove 421 can be equal to the diameter of the second ball 430, or can also be slightly larger than the diameter of the second ball 430, thereby ensuring that the second ball 430 cooperates well with the lower spray arm ball groove 243 and the second inner sleeve ball groove 421.

[0091] The lower spray arm 200 and the spray arm seat 500 are detachably connected.

[0092] Reference Figure 4-Figure 6 As shown, the spray arm seat 500 includes: a spray arm seat body 510, and a spray arm seat buckle 511 is provided on the top of the spray arm seat body 510. The spray arm seat buckle 511 is suitable for being clamped on the top of the inner sleeve of the second ball assembly 400, that is, the spray arm seat buckle 511 is suitable for being clamped on the top of the second inner sleeve 420, thereby realizing a fixed connection between the spray arm seat buckle 511 and the second inner sleeve 420. The spray arm seat 500 and the lower spray arm 200 are indirectly connected through the second ball assembly 400, and the structure of the connection among the spray arm seat 500, the lower spray arm 200 and the second ball assembly 400 is simple and stable.

[0093] The top of the spray arm seat body 510 has a plurality of spray arm seat grooves, the opening direction of the spray arm seat grooves is parallel to the axial direction of the spray arm seat body 510, the spray arm seat buckle 511 extends upward from the bottom wall of the spray arm seat groove, and the two sides of the spray arm seat buckle 511 are separated from the two side walls of the spray arm seat groove, thereby ensuring that the spray arm seat buckle 511 can be elastically deformed in the spray arm seat groove. The top of the spray arm seat buckle 511 is provided with a hook facing the second inner sleeve 420, and the hook is suitable for hooking on the top of the second inner sleeve 420, thereby limiting the relative axial position of the spray arm seat 500 and the second inner sleeve 420.

[0094] When the second inner sleeve 420 and the spray arm seat 500 are assembled, the inner circumference of the second inner sleeve 420 squeezes the hook of the spray arm seat buckle 511, so that the spray arm seat buckle 511 is deformed toward the inside of the spray arm seat body 510, ensuring that the spray arm seat buckle 511 can reach the top of the second inner sleeve 420 from the bottom end of the second inner sleeve 420 (that is, from bottom to top); when the spray arm seat buckle 511 passes over the top of the second inner sleeve 420, the extrusion force on the spray arm seat buckle 511 disappears; under the action of the spray arm seat buckle 511's own elastic force, the spray arm seat buckle 511 approaches the second inner sleeve 420, so that the hook hooks the top of the second inner sleeve 420.

[0095] When the second inner sleeve 420 needs to be separated from the spray arm seat 500, it is only necessary to lift the lower spray arm 200 upward with force. The top end of the second inner sleeve 420 squeezes the hook so that the hook is retracted into the second inner sleeve 420. Continue to lift the lower spray arm 200 to separate the second inner sleeve 420 from the spray arm seat 500.

[0096] The number of the spray arm seat buckles 511 can be multiple (for example, four), the spray arm seat grooves correspond one to one to the spray arm seat buckles 511, and the multiple spray arm seat buckles 511 are evenly arranged along the circumference of the spray arm seat body 510, thereby improving the clamping stability between the spray arm seat buckle 511 and the second inner sleeve 420.

[0097] Furthermore, the spray arm seat 500 further includes: a spray arm seat flange 520, which extends radially outwardly from the spray arm seat body 510, thereby facilitating the connection stability between the washing appliance 1000 and the inner tank of the dishwasher. The second ball assembly 400 is arranged above the spray arm seat flange 520, and the gaps between the lower surface of the lower spray arm lower connecting sleeve 240, the second ball assembly 400 and the upper surface of the spray arm seat flange 520 are all L1, and L1 satisfies the relationship: 0mm<L1≤1mm. That is, the gap between the lower surface of the lower spray arm lower connecting sleeve 240, the second intermediate sleeve 470, the second inner sleeve 420 and the upper surface of the spray arm seat flange 520 is L1, and L1 can be 0.3mm, 0.5mm or 0.8mm. Therefore, when the lower spray arm 200 and the spray arm seat 500 rotate relative to each other, the contact and sliding friction between the lower surfaces of the lower connecting sleeve 240, the second intermediate sleeve 470, and the second inner sleeve 420 of the lower spray arm and the upper surface of the flange 520 of the spray arm seat can be avoided, and leftovers or other contaminants can be prevented from entering the gap to increase the friction between the lower spray arm 200 and the spray arm seat 500 or even jam the lower spray arm 200. When the lower spray arm 200 tilts, the lower connecting sleeve 240 of the lower spray arm can quickly contact the spray arm seat 500, thereby avoiding further tilting of the lower spray arm 200.

[0098] In addition to the above-mentioned clamping form, the detachable connection between the spray arm seat body 510 and the second inner sleeve 420 can also be connected by threading. For example, in some embodiments not shown, the second inner sleeve 420 of the second ball assembly 400 has an inner sleeve thread, and the spray arm seat 500 has a spray arm seat thread, and the spray arm seat thread is screwed with the inner sleeve thread, so as to achieve the detachable connection between the spray arm seat body 510 and the second inner sleeve 420. When the spray arm seat thread and the inner sleeve thread are loosened, the spray arm seat body 510 and the second inner sleeve 420 can be disassembled. The spray arm seat body 510 and the second inner sleeve 420 are connected by threads, which is convenient for assembly and disassembly and reliable for connection.

[0099] In some embodiments, Fig.15 As shown, the spray arm seat 500 and the second inner sleeve 420 of the second ball assembly 400 are in interference fit.

[0100] In some embodiments, Fig.14 or Fig.15 As shown, there is an interference fit between the lower connection sleeve 240 of the lower spray arm and the second outer sleeve 410 of the second ball assembly 400; or

[0101] In some embodiments, Fig. 9 or Fig.10As shown, the second outer sleeve 410 of the second ball assembly 400 has an outer sleeve thread, and the lower connection sleeve 240 of the lower spray arm has a lower spray arm lower thread, and the lower spray arm lower thread is screwed with the outer sleeve thread. Optionally, the second ball hole 450 is arranged at the top of the second intermediate sleeve 470, the second ball hole 450 is a superior arc hole, and the second ball access port 451 is formed at the top notch of the second ball hole 450. The second ball 430 enters the second ball hole 450 or comes out of the second ball hole 450 through the second ball access port 451, thereby facilitating the installation and removal 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 to prevent the second ball 430 from falling off from the second ball hole 450 after installation.

[0102] Optionally, a second weakened groove 460 is disposed between two adjacent second ball holes 450, and a second weakened groove column 461 is disposed in the second weakened groove 460. The second intermediate sleeve 470 may have the same structure as the first intermediate sleeve 370.

[0103] In some embodiments not shown, the second ball hole 450 may also be disposed at the bottom of the second intermediate sleeve 470.

[0104] Of course, in other embodiments not shown, the second ball hole 450 can also be set in the middle position of the second intermediate sleeve 470. In this case, the second ball hole 450 is a round hole that penetrates the wall thickness of the second intermediate sleeve 470. Figure 14-15 In the illustrated embodiment, the first ball assembly 300 and the second ball assembly 400 may also adopt the following structure:

[0105] Either the first ball assembly 300 or the second ball assembly 400 includes:

[0106] An outer sleeve, an inner sleeve, an intermediate sleeve and balls. The inner sleeve is arranged inside the outer sleeve, the intermediate sleeve is arranged between the outer sleeve and the inner sleeve, a plurality of ball holes are arranged on the intermediate sleeve, the balls are installed in the ball holes, and the balls protrude from the inner circumference and outer circumference of the intermediate sleeve in the radial direction of the intermediate sleeve.

[0107] Specifically, the first ball assembly 300 includes: a first outer sleeve 310, a first intermediate sleeve 370, a first ball 330 and a first inner sleeve 320. The first inner sleeve 320 is arranged inside the first outer sleeve 310, and 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 arranged on the first intermediate sleeve 370. The first ball 330 is installed in the first ball hole 350, and the first ball 330 protrudes from the inner circumference and outer circumference of the first intermediate sleeve 370 in the radial direction of the first intermediate sleeve 370. The outer circumference of the first inner sleeve 320 is provided with a first inner sleeve ball groove 321 suitable for cooperating with the first ball 330. The inner circumference of the upper spray arm connecting sleeve 130 is in contact with the outer circumference of the first outer sleeve 310. Preferably, the upper spray arm connecting sleeve 130 and the first outer sleeve 310 are interference fit, thereby improving the connection firmness between the first ball assembly 300 and the upper spray arm 100. The inner circumference of the first outer sleeve 310 is provided with a first outer sleeve ball groove 313 suitable for cooperating with the first ball 330. By directly cooperating with the first inner sleeve 320 and the first outer sleeve 310, the upper spray arm connecting sleeve 130 and the lower spray arm upper connecting sleeve 220 can also be connected by rolling. The first outer sleeve ball groove 313 and the first inner sleeve ball groove 321 are both circumferential annular grooves, thereby realizing the full circle relative rotation of the upper spray arm 100 and the lower spray arm 200.

[0108] When the upper spray arm connecting sleeve 130 and the lower spray arm upper connecting sleeve 220 rotate relative to each other, the first outer sleeve 310 and the first inner sleeve 320 rotate relative to each other through the first ball 330. The friction between the upper spray arm 100 and the lower spray arm 200 is equivalent to rolling friction, which is beneficial to reducing hydrodynamic losses.

[0109] At this time, the first ball assembly 300 is a complete component and can be supplied separately without making changes to the upper spray arm connecting sleeve 130 and the lower spray arm upper connecting sleeve 220, so that the first ball assembly 300 can be assembled with the upper spray arm connecting sleeve 130 and the lower spray arm upper connecting sleeve 220, which is beneficial to reducing the processing steps of the washing appliance 1000. The first ball assembly 300 is an independent modular component, which is easy to install and disassemble, and also reduces the processing cost of the lower spray arm 200 or the upper spray arm 100.

[0110] The second ball assembly 400 includes: a second outer sleeve 410, a second intermediate sleeve 470, a second ball 430 and a second inner sleeve 420. The second inner sleeve 420 is arranged inside the second outer sleeve 410, and the second intermediate sleeve 470 is arranged between the second outer sleeve 410 and the second inner sleeve 420. A plurality of second ball holes 450 are arranged on the second intermediate sleeve 470. The second balls 430 are installed in the second ball holes 450, and the second balls 430 protrude from the inner circumference and the outer circumference of the second intermediate sleeve 470 in the radial direction of the second intermediate sleeve 470. The outer circumference of the second inner sleeve 420 is provided with a second inner sleeve ball groove 421 suitable for cooperating with the second ball 430. The inner circumference of the lower connection sleeve 240 of the lower spray arm is in contact with the outer circumference of the second outer sleeve 410. Preferably, the lower connection sleeve 240 of the lower spray arm and the second outer sleeve 410 are interference fit, thereby improving the connection firmness of the second ball assembly 400 and the lower spray arm 200. The inner circumference of the second outer sleeve 410 is provided with a second outer sleeve ball groove 413 suitable for cooperating with the second ball 430. By directly cooperating with the second ball 430, the second inner sleeve 420 and the second outer sleeve 410, the rolling connection between the lower connection sleeve 240 of the lower spray arm and the spray arm seat body 510 can also be realized. The second outer sleeve ball groove 413 and the second inner sleeve ball groove 421 are both circumferential annular grooves, thereby realizing the full circle relative rotation of the lower spray arm 200 and the spray arm seat 500.

[0111] When the lower connecting sleeve 240 of the lower spray arm rotates relative to the spray arm seat body 510, the second outer sleeve 410 and the second inner sleeve 420 rotate relative to each other through the second ball 430. The friction between the lower spray arm 200 and the spray arm seat 500 is equivalent to rolling friction, which is beneficial to reducing hydrodynamic losses.

[0112] At this time, the second ball assembly 400 is a complete component and can be supplied separately without making any changes to the lower spray arm lower connecting sleeve 240 and the spray arm seat body 510. The second ball assembly 400 can be assembled with the lower spray arm lower connecting sleeve 240 and the spray arm seat body 510, which is beneficial to reducing the processing steps of the washing appliance 1000.

[0113] The first intermediate sleeve 370 and the second intermediate sleeve 470 have three main functions: (1) by opening a ball hole on each intermediate sleeve and installing the ball in the ball hole, the position of the ball can be fixed and limited to prevent ball accumulation; (2) it plays the role of isolating food residues to prevent small food residues from entering the ball groove and causing friction; (3) it plays a reinforcing role and 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, to prevent serious shaking of the spray arm.

[0114] Reference Figure 9-10As shown, in some embodiments of the present invention, the lower spray arm 200 has a lower spray arm thread 280, and the second ball assembly 400 includes: a bearing base and a second ball 430, the second ball 430 is rotatably disposed on the bearing base, and the bearing base is provided with a base thread that cooperates with the lower spray arm thread 280.

[0115] According to the present invention Fig. 9 In one embodiment shown, the bearing substrate may include: a second outer sleeve 410 , a second middle sleeve 470 , and a second inner sleeve 420 .

[0116] The second outer sleeve 410 is provided with a second outer sleeve ball groove 413 suitable for cooperating with the second ball 430 on its inner circumferential surface, the second intermediate sleeve 470 is provided on the inner side of the second outer sleeve 410, the second ball 430 is provided on the second intermediate sleeve 470, the second inner sleeve 420 is provided on the inner side of the second intermediate sleeve 470, and the second inner sleeve 420 is provided with a second inner sleeve ball groove 421 suitable for cooperating with the second ball 430 on its outer circumferential surface, that is, the second ball 430 is in rolling contact with the inner surface of the second outer sleeve 410 and the outer surface of the second inner sleeve 420. The second inner sleeve ball groove 421 and the second outer sleeve ball groove 413 are both circumferential annular grooves, thereby ensuring the smoothness of the full rotation of the lower spray arm 200. The second ball 430 is in rolling contact with the second inner sleeve ball groove 421 and the second outer sleeve ball groove 413, and the friction force is small. In a specific embodiment, the diameter of the second inner sleeve ball groove 421 and the second outer sleeve ball groove 413 can be equal to the diameter of the second ball 430, or can be slightly larger than the diameter of the second ball 430, thereby ensuring that the second ball 430 cooperates well with the second inner sleeve ball groove 421 and the second outer sleeve ball groove 413.

[0117] Further, refer to Fig. 9 As shown, in the direction of the central axis of the lower connection sleeve 240 of the lower spray arm, the positions of the second outer sleeve ball groove 413, the second inner sleeve ball groove 421, and the second ball hole 450 correspond, and the second ball 430 is partially arranged in the second ball hole 450, and the outer side of the second ball 430 contacts the second outer sleeve ball groove 413, and the inner side of the second ball 430 contacts the second inner sleeve ball groove 421, thereby completing the connection between 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, which can prevent the second ball 430 from sliding along a different trajectory from the second outer sleeve ball groove 413 and the second inner sleeve ball groove 421 when the lower spray arm 200 rotates, thereby being squeezed, resulting in the lower spray arm 200 being unable to rotate.

[0118] Furthermore, the outer circumference of the second inner sleeve 420 is provided with a second inner sleeve outer thread 422, and the inner circumference of the spray arm seat 500 is provided with a spray arm seat inner thread 530 suitable for matching with the second inner sleeve outer thread 422. In other words, the spray arm seat 500 and the second inner sleeve 420 are fixedly connected by screw connection, which is convenient for assembly and disassembly and reliable in connection.

[0119] Specifically, the base thread is the second outer sleeve internal thread 414 provided on the inner circumference of the second outer sleeve 410, and the lower spray arm thread 280 is the lower spray arm external thread provided on the outer circumference of the lower spray arm lower connecting sleeve 240, and the lower spray arm external thread is suitable for matching with the second outer sleeve internal thread 414. In other words, the lower spray arm 200 and the second outer sleeve 410 are fixedly connected by screw connection, which is convenient for assembly and disassembly and reliable for connection.

[0120] The lower spray arm 200 and the spray arm seat 500 are indirectly connected via the second ball assembly 400 , and the structure of the connection among the lower spray arm 200 , the spray arm seat 500 and the second ball assembly 400 is simple and stable.

[0121] When the lower spray arm 200 rotates relative to the spray arm seat 500, the second ball 430 rolls, causing the second outer sleeve 410 and the second inner sleeve 420 to rotate relative to each other. Because the lower spray arm 200 and the second outer sleeve 410 are fixed, and the spray arm seat 500 and the second inner sleeve 420 are fixed, the lower spray arm 200 and the spray arm seat 500 can rotate relative to each other.

[0122] Preferably, the second inner sleeve outer thread 422 is located below the second inner sleeve ball groove 421. In other words, the matching position of the second inner sleeve 420 and the lower spray arm 200 is located at the top, and the fixed position of the second inner sleeve 420 and the spray arm seat 500 is located at the bottom. In this way, the height space of the second ball assembly 400 can be fully utilized to avoid the axial dimension of the connection between the lower spray arm 200 and the spray arm seat 500 being too large.

[0123] The second intermediate sleeve 470 is provided with a plurality of second ball holes 450, in which the second balls 430 are installed. The second ball holes 450 provide support for the fixation of the second balls 430, ensuring that the relative positions of the plurality of second balls 430 remain unchanged, and preventing collision and extrusion between the plurality of second balls 430, thereby improving the working stability of the second ball assembly 400, and further improving the smoothness of the spray arm when rotating. Optionally, the number of the second balls 430 is the same as the number of the second ball holes 450.

[0124] There are multiple second balls 430 , and the multiple second balls 430 can be evenly distributed along the circumference of the second intermediate sleeve 470 , thereby making the relative rotation of the lower spray arm 200 and the spray arm seat 500 more stable.

[0125] The second ball 430 protrudes from the inner circumference and the outer circumference of the second intermediate sleeve 470 in the radial direction of the second intermediate sleeve 470, and the second ball 430 is in rolling contact with the second outer sleeve 410 and the second inner sleeve 420. Since the second outer sleeve 410 is fixed to the lower connecting sleeve 240 of the lower spray arm, and the second inner sleeve 420 is fixed to the spray arm seat 500, the lower spray arm 200 and the spray arm seat 500 are indirectly connected through the second ball assembly 400, which is equivalent to the rolling contact between the lower spray arm 200 and the spray arm seat 500. The second ball 430 provides support for the connection between the lower spray arm 200 and the spray arm seat 500.

[0126] When the lower spray arm 200 and the spray arm seat 500 rotate relative to each other, the second outer sleeve 410 and the second inner sleeve 420 are in contact with each other through the second balls 430 , so rolling friction occurs between the second outer sleeve 410 and the second inner sleeve 420 .

[0127] Reference Fig. 9 As shown, the top of the spray arm seat 500 has a spray arm seat flange 520, which extends radially outward from the spray arm seat 500, and is disposed below the second outer sleeve 410, and the gap between the upper surface of the spray arm seat flange 520 and the lower surface of the second outer sleeve 410 is L2, and L2 satisfies the relationship: 0mm<L2≤1mm. Thus, when the lower spray arm 200 and the spray arm seat 500 rotate relative to each other, the contact between the lower surface of the second outer sleeve 410 and the upper surface of the spray arm seat flange 520 and the sliding friction can be avoided, and leftovers or other contaminants can be prevented from entering the gap to increase the friction between the lower spray arm 200 and the spray arm seat 500 or even jam the lower spray arm 200. Optionally, L2 can be 0.3mm, 0.5mm or 0.8mm.

[0128] Specifically, the lower spray arm lower connecting sleeve 240 includes: a connecting sleeve peripheral wall 241 and a connecting sleeve bottom wall 242, the connecting sleeve bottom wall 242 extends radially inward along the connecting sleeve peripheral wall 241, and the connecting sleeve bottom wall 242 is arranged at one end of the connecting sleeve peripheral wall 241 away from the lower spray arm body 230, such as Fig. 9As shown, the bottom wall 242 of the connecting sleeve is arranged at the lower end of the peripheral wall 241 of the connecting sleeve. The second inner sleeve 420 and the second intermediate sleeve 470 are arranged below the bottom wall 242 of the connecting sleeve. The inner diameter of the bottom wall 242 of the connecting sleeve is equal to the inner diameter of the second inner sleeve 420. When the water source of the dishwasher is turned on, the water first flows through the spray arm seat 500 and the second inner sleeve 420, and then flows into the lower chamber 250. Therefore, the inner diameter of the bottom wall 242 of the connecting sleeve is equal to the inner diameter of the second inner sleeve 420, which can ensure that the water flow speed in the lower spray arm 200 and the second inner sleeve 420 is equal, and the water flow speed entering the lower chamber 250 is stable, thereby ensuring that the water pressure in the lower chamber 250 rises steadily, preventing the flow speed from suddenly changing at the connection between the lower spray arm 200 and the spray arm seat 500, ensuring that the lower spray arm 200 can rotate stably, and further ensuring that the working reliability of the washing appliance 1000 is high.

[0129] The gap between the upper surface of the second inner sleeve 420 and the lower surface of the bottom wall 242 of the connecting sleeve is L3, and L3 satisfies the relationship: 0mm<L3≤0.5mm, for example, L3 can be 0.1mm, 0.2mm or 0.3mm. Therefore, when the lower spray arm 200 and the spray arm seat 500 rotate relative to each other, the upper surface of the second inner sleeve 420 and the lower surface of the bottom wall 242 of the connecting sleeve can be prevented from contacting and sliding friction, that is, there is no friction 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 bottom wall 242 of the connecting sleeve is small, which can avoid water leakage, and can also prevent leftovers or other pollutants from entering the gap to increase the friction between the lower spray arm 200 and the spray arm seat 500 or even jam the lower spray arm 200. When the lower spray arm 200 tilts, the lower spray arm 200 can quickly contact the second inner sleeve 420, thereby preventing the lower spray arm 200 from further tilting.

[0130] Reference Fig. 9 As shown, the bottom of the spray arm seat 500 has a spray arm seat water inlet shaft 540 extending radially inwardly of the spray arm seat 500, and the inner diameter of the spray arm seat water inlet shaft 540 is equal to the inner diameter of the second inner sleeve 420. Similarly, when the water source of the dishwasher is turned on, the water first flows through the spray arm seat 500 and 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, which can ensure that the water flow speed in the spray arm seat 500 and the second inner sleeve 420 is equal, and the water flow speed entering the second inner sleeve 420 is stable, thereby ensuring that the water flow speed is stable when entering the lower chamber 250 through the second inner sleeve 420 and the bottom wall 242 of the connecting sleeve, preventing the occurrence of a sudden change in flow speed at the connection between the lower spray arm 200 and the spray arm seat 500, and ensuring that the lower spray arm 200 can rotate stably.

[0131] According to the present invention Fig.10In yet another embodiment shown, the bearing substrate may include: a second outer sleeve 410 and a second middle sleeve 470 .

[0132] The second outer sleeve 410 is provided with a second outer sleeve ball groove 413 suitable for cooperating with the second ball 430 on its inner circumferential surface, the second intermediate sleeve 470 is arranged on the inner side of the second outer sleeve 410, the spray arm seat 500 is arranged on the inner side of the second intermediate sleeve 470, and the spray arm seat ball groove 570 suitable for cooperating with the second ball 430 is provided on the outer circumferential surface of the spray arm seat 500.

[0133] The second intermediate sleeve 470 is provided with a plurality of second ball holes 450, in which the second balls 430 are installed. The second ball holes 450 provide support for the fixation of the second balls 430, ensuring that the relative positions of the plurality of second balls 430 remain unchanged, and preventing collision and extrusion between the plurality of second balls 430, thereby improving the working stability of the second ball assembly 400, and further improving the smoothness of the spray arm when rotating. Optionally, the number of the second balls 430 is the same as the number of the second ball holes 450.

[0134] There are multiple second balls 430, and the multiple second balls 430 can be evenly distributed along the circumference of the second intermediate sleeve 470, thereby making the relative rotation of the lower spray arm 200 and the spray arm seat 500 more stable. Preferably, the number of the second balls 430 is an even number, thereby ensuring that the second ball assembly 400 is subjected to balanced force and relieving stress concentration.

[0135] The second ball 430 protrudes from the inner circumference and the outer circumference of the second intermediate sleeve 470 in the radial direction of the second intermediate sleeve 470. When the lower spray arm 200 and the spray arm seat 500 rotate relative to each other, the second outer sleeve 410 and the spray arm seat 500 are in contact with each other through the second ball 430, so there is rolling friction between the second outer sleeve 410 and the spray arm seat 500.

[0136] The spray arm seat ball groove 570 and the second outer sleeve ball groove 413 are both circumferential annular grooves, thereby ensuring the smoothness of the full rotation of the lower spray arm 200. 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 the friction force is small. In a specific embodiment, the diameter of the spray arm seat ball groove 570 and the second outer sleeve ball groove 413 can be equal to the diameter of the second ball 430, or can also be slightly larger than the diameter of the second ball 430, thereby ensuring that the second ball 430 and the spray arm seat ball groove 570 and the second outer sleeve ball groove 413 cooperate well.

[0137] Further, the base thread is a second outer sleeve external thread 415 provided on the outer circumference of the second outer sleeve 410, and the lower spray arm thread 280 is a lower spray arm internal thread provided on the inner circumference of the lower spray arm lower connecting sleeve 240, and the lower spray arm internal thread is suitable for matching with the second outer sleeve external thread 415. In other words, the lower spray arm 200 and the second outer sleeve 410 are fixedly connected by screw connection, which is convenient for assembly and disassembly and reliable for connection.

[0138] The second outer sleeve 410 may include: a second outer sleeve peripheral wall 411 and a second outer sleeve bottom wall 412, wherein the second outer sleeve bottom wall 412 is arranged at the bottom of the second outer sleeve peripheral wall 411, and the second outer sleeve bottom wall 412 extends radially inward along the second outer sleeve peripheral wall 411, and the second ball 430 is arranged above the second outer sleeve bottom wall 412, thereby, the second outer sleeve bottom wall 412 can play a certain protective role for the second ball 430, preventing the second ball 430 from being exposed to the outside and affecting the service life of the second ball 430.

[0139] The second ball hole 450 is a major arc hole, and a second ball access opening 451 is formed at the bottom notch of the second ball hole 450. The second ball 430 enters or exits the second ball hole 450 through the second ball access opening 451, thereby facilitating the installation and removal of the second ball 430 in the second ball hole 450.

[0140] Optionally, a second weakening groove 460 is provided between two adjacent second ball holes 450. By providing the second weakening groove 460, the rigidity between two adjacent second ball holes 450 can be reduced. Therefore, when the second ball 430 is installed, the second ball hole 450 is easily deformed, thereby reducing the difficulty of installing or disassembling the second ball 430.

[0141] A second weakening groove column 461 is provided in the second weakening groove 460. Optionally, the central axis of the second weakening groove column 461 is parallel to the central axis of the second intermediate sleeve 470, which is conducive to simplifying the processing technology of the second intermediate sleeve 470. By providing the second weakening groove column 461, a certain strengthening effect can be played, thereby preventing the second weakening groove 460 from excessively weakening the rigidity of the second intermediate sleeve 470, which is conducive to improving the working reliability of the second ball assembly 400.

[0142] The second outer sleeve external thread 415 is arranged on the outer peripheral surface of the second outer sleeve peripheral wall 411, the second outer sleeve ball groove 413 is arranged on the inner peripheral surface of the second outer sleeve peripheral wall 411, and the second outer sleeve ball groove 413 is arranged below the second outer sleeve external thread 415, thereby, the fixed position of the second outer sleeve 410 and the lower spray arm 200 is located at the top, and the matching position of the second outer sleeve 410 and the spray arm seat 500 is located at the bottom, thereby making full use of the height space and preventing the axial dimension of the connection between the lower spray arm 200 and the spray arm seat 500 from being too large.

[0143] In a specific embodiment, the balls may be plastic balls or stainless steel balls. Since the working environment of the washing appliance 1000 is filled with water and the washing appliance 1000 is in a hot and humid environment for a long time, the balls may easily rust and become stuck. Plastic balls or stainless steel balls have strong anti-corrosion capabilities and can effectively slow down or even prevent the balls from rusting.

[0144] Optionally, the length of the upper spray arm body 120 is 0.5-2 times the length of the lower spray arm body 230 .

[0145] Specifically, in some embodiments, the length of the upper spray arm body 120 is 0.5-1 times the length of the lower spray arm body 230. The length of the upper spray arm body 120 is shorter, thereby reducing the weight of the upper spray arm 100, thereby ensuring that the upper spray arm 100 can rotate smoothly, and the structure of the entire spray arm is relatively stable and not prone to tipping. In addition, the length of the upper spray arm body 120 is shorter than the length of the lower spray arm body 230, which can make the volume in the upper chamber 140 smaller than the volume of the lower chamber 250. During the cleaning stage, most of the water flow enters the lower chamber 250 first, and the water pressure in the lower chamber 250 is higher, which can ensure that the pressure of the water column sprayed from the first drive hole 211 is larger, and the lower spray arm 200 can rotate smoothly in the first direction. By setting the length of the upper spray arm body 120 to be shorter, the volume of the upper chamber 140 can be reduced, thereby ensuring that there is a sufficiently high water pressure in the upper chamber 140, and further ensuring that the pressure of the water column sprayed from the second drive hole 111 is relatively high, thereby generating a larger reverse driving force to drive the upper spray arm 100 to rotate smoothly in the second direction.

[0146] 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 1-2 times the length of the lower spray arm body 230, thereby increasing the force arm length of the upper spray arm body 120, and only a small driving force is required to drive the upper spray arm body 120 to rotate. 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 at this time, the length of the upper spray arm body 120 and the lower spray arm body 230 is the longest size that can be accommodated inside the dishwasher, which is conducive to improving the cleaning ability.

[0147] The length ratio of the shortest spray arm to the longest spray arm should not be less than 0.5. This is because when the spray arm is too short, a greater driving force will be required, so the driving hole diameter will be larger or the number of driving holes will be more. Compared with the water spray hole, the amount of water sprayed from the driving hole onto the tableware is less, which is not conducive to cleaning. Therefore, the spray arm should not be too short. It is more reasonable to set the minimum length ratio of the shortest spray arm to the longest spray arm to 0.5.

[0148] like Figure 1-Figure 2 As shown, a first driving protrusion 210 is provided on the lower spray arm body 230, and the first driving protrusion 210 protrudes from 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 provided on the upper end surface of the lower spray arm body 230. By providing the first driving protrusion 210, it is convenient to open the first driving hole 211 with a specific orientation. The first driving hole 211 is provided on the first driving protrusion 210. In some embodiments, the orientation (i.e., the normal direction) of the first driving hole 211 can be parallel to the left-right symmetric plane of the lower spray arm 200, thereby ensuring that when the water column is sprayed from the first driving hole 211, the reaction force generated causes the lower spray arm 200 to rotate in the first direction.

[0149] The upper spray arm body 120 is provided with a second driving protrusion 110, the second driving protrusion 110 protrudes from the surface of the upper spray arm body 120, and the second driving hole 111 is formed on the second driving protrusion 110. Specifically, the second driving protrusion 110 is provided on the upper end surface of the upper spray arm body 120, the function of the second driving protrusion 110 is the same as that of the first driving protrusion 210, and the direction (i.e., the normal direction) of the second driving hole 111 can be parallel to the left-right symmetric plane of the upper spray arm 100, and its effect is the same as that of the first driving hole 211, which will not be repeated here, except that the direction of the second driving hole 111 is opposite to that of the first driving hole 211, thereby ensuring that when the water column is sprayed from the second driving hole 111, the reaction force generated causes the upper spray arm 100 to rotate in the second direction, thereby ensuring that the upper spray arm 100 and the lower spray arm 200 rotate in opposite directions.

[0150] Furthermore, the angle between the normal line of the first driving hole 211 and the axis of the lower spray arm upper connecting sleeve 220 is 0°-90°, and the angle between the normal line of the second driving hole 111 and the axis of the upper spray arm connecting sleeve 130 is 0°-90°.

[0151] Optionally, at the same end of the lower spray arm body 230 and the upper spray arm body 120, the first drive hole 211 and the second drive hole 111 are oriented in opposite directions, thereby ensuring that the upper spray arm 100 rotates in opposite directions to the lower spray arm 200. There may be multiple first drive holes 211 and second drive holes 111, which is beneficial to increase the water spray volume and improve the driving force.

[0152] Optionally, there are two first drive holes 211, and the two first drive holes 211 are respectively arranged at both ends of the lower spray arm body 230. The first drive hole 211 arranged at one end (for example, the right end) of the lower spray arm body 230 should be in the opposite direction to the first drive hole 211 arranged at the other end (for example, the left end) of the lower spray arm body 230. This ensures that the directions of the reaction torques generated from each first drive hole 211 are the same, which is beneficial to improving the rotational driving force of the lower spray arm 200 and ensuring that the lower spray arm 200 rotates faster.

[0153] There are two second drive holes 111, and the two second drive holes 111 are respectively arranged at both ends of the upper spray arm body 120. The second drive hole 111 arranged at one end (for example, the right end) of the upper spray arm body 120 should be in the opposite direction to the second drive hole 111 arranged at the other end (for example, the left end) of the upper spray arm body 120. This ensures that the directions of the reaction torques generated from the respective second drive holes 111 are the same, which is beneficial to improving the rotational driving force of the upper spray arm 100 and ensuring that the upper spray arm 100 rotates at a faster speed.

[0154] By increasing the number of driving holes, the water output per unit time can be increased, thereby increasing the driving force. By setting the first driving hole 211 at the end of the lower spray arm body 230 and the second driving hole 111 at the end of the upper spray arm body 120, it is helpful to increase the force arm length of the driving force at the first driving hole 211 and the second driving hole 111. In this way, only a small amount of water energy is needed to drive the lower spray arm 200 and the upper spray arm 100 to rotate. Therefore, in a specific embodiment, the first driving hole 211 is 100 meters away from the center of the lower spray arm body 230, and the second driving hole 111 is 100 meters away from the center of the upper spray arm body 120. The center position is as far away as possible, and the first drive hole 211 is preferably set at the end of the lower spray arm body 230 and the second drive hole 111 is set at the end of the upper spray arm body 120. When the water column is sprayed from the first drive hole 211 and the second drive hole 111, the torque applied to the rotating shaft of the lower spray arm 200 and the upper spray arm 100 is relatively large, thereby ensuring that the reaction force generated when the water column is sprayed is utilized as much as possible, thereby increasing the rotation speed of the lower spray arm 200 and the upper spray arm 100, which is beneficial to improving the cleaning effect of the washing appliance 1000.

[0155] Optionally, the first driving protrusion 210 and the second driving protrusion 110 are configured as a cuboid, a cube, a quadrangular pyramid, a trapezoid or a cylinder, but are not limited to the above structures. Figure 1-Figure 2 , Figure 11-Figure 12 In the example, the first driving protrusion 210 and the second driving protrusion 110 are both configured as quadrangular pyramids.

[0156] based on Figure 5 , Fig.14 In the embodiment of the present invention, the first ball assembly 300 of the present invention can have a variety of deformation modes, and these deformation modes all fall within the protection scope of the present invention. Figure 5 , Fig.14 A plurality of modified examples of the first ball assembly 300 according to the embodiment of the present invention are summarized.

[0157] For example, in the first embodiment not shown, the first ball assembly 300 may only include: a first ball 330, that is, compared with the above Fig.14 For the embodiment of the present invention, the first intermediate sleeve 370, the first inner sleeve 320 and the first outer sleeve 310 are reduced, and the first ball bearing 330 is directly matched with the upper spray arm connecting sleeve 130 and the lower spray arm upper connecting sleeve 220, so that the upper spray arm connecting sleeve 130 and the lower spray arm upper connecting sleeve 220 can also be connected by rolling. At this time, the upper spray arm connecting sleeve 130 is provided with an upper spray arm ball bearing groove suitable for matching with the first ball bearing 330 on the inner circumference surface, and the lower spray arm upper connecting sleeve 220 is provided with a lower spray arm ball bearing groove suitable for matching with the first ball bearing 330 on the outer circumference surface.

[0158] For example, in the second embodiment not shown, the first ball assembly 300 may only include: a first ball 330 and a first inner sleeve 320, that is, compared with the above Fig.14 In the embodiment of the present invention, the first intermediate sleeve 370 and the first outer sleeve 310 are reduced, and the first ball 330 is directly matched with the first inner sleeve 320 and the upper spray arm connecting sleeve 130, so that the upper spray arm connecting sleeve 130 and the lower spray arm upper connecting sleeve 220 can also be connected by rolling. At this time, the upper spray arm connecting sleeve 130 is provided with an upper spray arm ball groove suitable for matching with the first ball 330 on the inner circumferential surface, and the first inner sleeve 320 is provided with a first inner sleeve ball groove 321 suitable for matching with the first ball 330 on the outer circumferential surface.

[0159] For example, in the third embodiment not shown, the first ball assembly 300 may only include: a first ball 330 and a first outer sleeve 310, that is, compared with the above Fig.14In the embodiment of the present invention, the first intermediate sleeve 370 and the first inner sleeve 320 are reduced, and the first ball 330 is used to directly cooperate with the lower spray arm upper connecting sleeve 220 and the first outer sleeve 310, so that the upper spray arm connecting sleeve 130 and the lower spray arm upper connecting sleeve 220 can also be connected by rolling. At this time, the outer circumference of the lower spray arm upper connecting sleeve 220 is provided with a lower spray arm ball groove suitable for cooperating with the first ball 330, and the inner circumference of the first outer sleeve 310 is provided with a first outer sleeve ball groove 313 suitable for cooperating with the first ball 330.

[0160] For example, in the fourth embodiment not shown, the first ball assembly 300 may only include: a first ball 330, a first inner sleeve 320 and a first outer sleeve 310, that is, compared with the above Fig.14 In the embodiment of the present invention, the first intermediate sleeve 370 is reduced, and the first ball 330 is used to directly cooperate with the first inner sleeve 320 and the first outer sleeve 310, so that the upper spray arm connecting sleeve 130 and the lower spray arm upper connecting sleeve 220 can also be connected by rolling. At this time, the first outer sleeve 310 can be interference-fitted with the upper spray arm connecting sleeve 130, and the first inner sleeve 320 can be interference-fitted with the lower spray arm upper connecting sleeve 220. The inner circumference of the first outer sleeve 310 is provided with a first outer sleeve ball groove 313 suitable for cooperating with the first ball 330, and the outer circumference of the first inner sleeve 320 is provided with a first inner sleeve ball groove 321 suitable for cooperating with the first ball 330.

[0161] For example, in the fifth embodiment not shown, the first ball assembly 300 may only include: a first ball 330 and a first intermediate sleeve 370, that is, compared with the above Fig.14 In the embodiment of the present invention, the first inner sleeve 320 and the first outer sleeve 310 are reduced, and the first ball 330 is used to directly cooperate with the upper spray arm connecting sleeve 130 and the lower spray arm upper connecting sleeve 220, so that the upper spray arm connecting sleeve 130 and the lower spray arm upper connecting sleeve 220 can also be connected by rolling. At this time, the upper spray arm connecting sleeve 130 is provided with an upper spray arm ball groove suitable for cooperating with the first ball 330 on the inner circumference surface, and the lower spray arm upper connecting sleeve 220 is provided with a lower spray arm ball groove suitable for cooperating with the first ball 330 on the outer circumference surface.

[0162] For example, in the sixth embodiment not shown, the first ball assembly 300 may only include: a first ball 330, a first inner sleeve 320 and a first intermediate sleeve 370, that is, compared with the above Fig.14In the embodiment of the present invention, the first outer sleeve 310 is reduced, and the first ball 330 is used to directly cooperate with the first inner sleeve 320 and the upper spray arm connecting sleeve 130, so that the upper spray arm connecting sleeve 130 and the lower spray arm upper connecting sleeve 220 can also be connected by rolling. At this time, the upper spray arm connecting sleeve 130 is provided with an upper spray arm ball groove suitable for cooperating with the first ball 330 on the inner circumference surface, and the first inner sleeve 320 is provided with a first inner sleeve ball groove 321 suitable for cooperating with the first ball 330 on the outer circumference surface.

[0163] For example, in the seventh embodiment not shown, the first ball assembly 300 may only include: a first ball 330, a first outer sleeve 310 and a first intermediate sleeve 370, that is, compared with the above Fig.14 In the embodiment of the present invention, the first inner sleeve 320 is omitted, and the first ball 330 is used to directly cooperate with the lower spray arm upper connecting sleeve 220 and the first outer sleeve 310, so that the upper spray arm connecting sleeve 130 and the lower spray arm upper connecting sleeve 220 can also be connected by rolling. At this time, the outer circumference of the lower spray arm upper connecting sleeve 220 is provided with a lower spray arm ball groove suitable for cooperating with the first ball 330, and the inner circumference of the first outer sleeve 310 is provided with a first outer sleeve ball groove 313 suitable for cooperating with the first ball 330.

[0164] Of course, in some embodiments not shown, the lower spray arm upper connecting sleeve 220 may also be sleeved on the outer side of the upper spray arm connecting sleeve 130. At this time, the inner side of the first ball assembly 300 cooperates with the upper spray arm connecting sleeve 130, and the outer side of the first ball assembly 300 cooperates with the lower spray arm upper connecting sleeve 220. The situation in which the lower spray arm upper connecting sleeve 220 is sleeved on the inner side of the upper spray arm connecting sleeve 130 is similar to the above seven embodiments and will not be repeated here.

[0165] based on Figure 5 , Fig.15 In the embodiment of the present invention, the second ball assembly 400 of the present invention can have a variety of deformation modes, and these deformation modes all fall within the protection scope of the present invention. Figure 5 , Fig.15 A plurality of modified examples of the second ball assembly 400 according to the embodiment of the present invention are summarized.

[0166] For example, in the first embodiment not shown, the second ball assembly 400 may only include: a second ball 430, that is, compared with the above Fig.15In the embodiment of the present invention, the second intermediate sleeve 470, the second inner sleeve 420 and the second outer sleeve 410 are reduced, and the second ball bearing 430 is directly matched with the lower connection sleeve 240 of the lower spray arm and the spray arm seat body 510, so that the lower connection sleeve 240 of the lower spray arm and the spray arm seat body 510 can also be connected by rolling. At this time, the inner circumference of the lower connection sleeve 240 of the lower spray arm is provided with an upper spray arm ball bearing groove suitable for matching with the second ball bearing 430, and the outer circumference of the spray arm seat body 510 is provided with a lower spray arm ball bearing groove suitable for matching with the second ball bearing 430.

[0167] For example, in the second embodiment not shown, the second ball assembly 400 may only include: a second ball 430 and a second inner sleeve 420, that is, compared with the above Fig.15 In the embodiment of the present invention, the second intermediate sleeve 470 and the second outer sleeve 410 are reduced, and the second ball 430 is used to directly cooperate with the second inner sleeve 420 and the lower spray arm lower connecting sleeve 240, so that the lower spray arm lower connecting sleeve 240 and the spray arm seat body 510 can also be connected by rolling. At this time, the inner circumference of the lower spray arm lower connecting sleeve 240 is provided with an upper spray arm ball groove suitable for cooperating with the second ball 430, and the outer circumference of the second inner sleeve 420 is provided with a second inner sleeve ball groove 421 suitable for cooperating with the second ball 430.

[0168] For example, in the third embodiment not shown, the second ball assembly 400 may only include: a second ball 430 and a second outer sleeve 410, that is, compared with the above Fig.15 In the embodiment of the present invention, the second intermediate sleeve 470 and the second inner sleeve 420 are reduced, and the second ball 430 is used to directly cooperate with the spray arm seat body 510 and the second outer sleeve 410, so that the lower spray arm lower connecting sleeve 240 and the spray arm seat body 510 can also be connected by rolling. At this time, the outer circumference of the spray arm seat body 510 is provided with a lower spray arm ball groove suitable for cooperating with the second ball 430, and the inner circumference of the second outer sleeve 410 is provided with a second outer sleeve ball groove 413 suitable for cooperating with the second ball 430.

[0169] For example, in the fourth embodiment not shown, the second ball assembly 400 may only include: a second ball 430, a second inner sleeve 420 and a second outer sleeve 410, that is, compared with the above Fig.15In the embodiment of the present invention, the second intermediate sleeve 470 is reduced, and the second ball 430 is used to directly cooperate with the second inner sleeve 420 and the second outer sleeve 410, so that the lower connection sleeve 240 of the lower spray arm and the spray arm seat body 510 can also be connected by rolling. At this time, the second outer sleeve 410 can be interference-fitted with the lower connection sleeve 240 of the lower spray arm, and the second inner sleeve 420 can be interference-fitted with the spray arm seat body 510. The inner circumference of the second outer sleeve 410 is provided with a second outer sleeve ball groove 413 suitable for cooperating with the second ball 430, and the outer circumference of the second inner sleeve 420 is provided with a second inner sleeve ball groove 421 suitable for cooperating with the second ball 430.

[0170] For example, in the fifth embodiment not shown, the second ball assembly 400 may only include: a second ball 430 and a second intermediate sleeve 470, that is, compared with the above Fig.15 In the embodiment of the present invention, the second inner sleeve 420 and the second outer sleeve 410 are reduced, and the second ball bearing 430 is used to directly cooperate with the lower spray arm lower connecting sleeve 240 and the spray arm seat body 510, so that the lower spray arm lower connecting sleeve 240 and the spray arm seat body 510 can also be connected by rolling. At this time, the inner circumference of the lower spray arm lower connecting sleeve 240 is provided with an upper spray arm ball bearing groove suitable for cooperating with the second ball bearing 430, and the outer circumference of the spray arm seat body 510 is provided with a lower spray arm ball bearing groove suitable for cooperating with the second ball bearing 430.

[0171] For example, in the sixth embodiment not shown, the second ball assembly 400 may only include: a second ball 430, a second inner sleeve 420 and a second intermediate sleeve 470, that is, compared with the above Fig.15 In the embodiment of the present invention, the second outer sleeve 410 is reduced, and the second ball 430 is used to directly cooperate with the second inner sleeve 420 and the lower spray arm lower connecting sleeve 240, so that the lower spray arm lower connecting sleeve 240 and the spray arm seat body 510 can also be connected by rolling. At this time, the inner circumference of the lower spray arm lower connecting sleeve 240 is provided with an upper spray arm ball groove suitable for cooperating with the second ball 430, and the outer circumference of the second inner sleeve 420 is provided with a second inner sleeve ball groove 421 suitable for cooperating with the second ball 430.

[0172] For example, in the seventh embodiment not shown, the second ball assembly 400 may only include: a second ball 430, a second outer sleeve 410 and a second intermediate sleeve 470, that is, compared with the above Fig.15In the embodiment of the present invention, the second inner sleeve 420 is omitted, and the second ball 430 is used to directly cooperate with the spray arm seat body 510 and the second outer sleeve 410, so that the lower spray arm lower connecting sleeve 240 and the spray arm seat body 510 can also be connected by rolling. At this time, the outer circumference of the spray arm seat body 510 is provided with a lower spray arm ball groove suitable for cooperating with the second ball 430, and the inner circumference of the second outer sleeve 410 is provided with a second outer sleeve ball groove 413 suitable for cooperating with the second ball 430.

[0173] Of course, in some embodiments not shown, the spray arm seat body 510 can also be sleeved on the outer side of the lower connecting sleeve 240 of the lower spray arm. At this time, the inner side of the second ball assembly 400 cooperates with the lower connecting sleeve 240 of the lower spray arm, and the outer side of the second ball assembly 400 cooperates with the spray arm seat body 510. The situation in which the spray arm seat body 510 is sleeved on the inner side of the lower connecting sleeve 240 of the lower spray arm is similar to the above-mentioned seven embodiments and will not be repeated here.

[0174] It should be noted that, in the present invention, the upper and lower positional 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. Of course, in some embodiments not shown, the spray arm may also be installed on the top wall or 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 that is away from the side wall of the dishwasher. That is to say, no matter where the spray arm is installed in the dishwasher, the upper spray arm 100 is always located on the side of the lower spray arm 200 that faces the internal cavity of the dishwasher.

[0175] The washing appliance 1000 may be a dishwasher, or may be a fruit and vegetable washing machine, a medical washing machine, or other washing appliance 1000 having a washing function.

[0176] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A washing appliance, characterized in that: include: A spray arm, the spray arm comprising: a lower spray arm and an upper spray arm, the upper spray arm is connected to the lower spray arm and is located above the lower spray arm, the upper spray arm is rotatable relative to the lower spray arm, and a driving hole for driving the spray arm to rotate is provided on the spray arm; A spray arm seat, the spray arm is connected to the spray arm seat, and the spray arm is rotatable relative to the spray arm seat; The upper spray arm comprises: an upper spray arm body and an upper spray arm connecting sleeve, wherein the upper spray arm connecting sleeve is arranged at the lower side of the upper spray arm body; The lower spray arm comprises: a lower spray arm upper connecting sleeve, a lower spray arm body and a lower spray arm lower connecting sleeve, wherein the lower spray arm upper connecting sleeve is arranged on the upper side of the lower spray arm body, and the lower spray arm lower connecting sleeve is arranged on the lower side of the lower spray arm body; The lower spray arm upper connecting sleeve, the lower spray arm body and the lower spray arm lower connecting sleeve have a connected lower chamber, the spray arm seat has a spray arm seat chamber, and the spray arm seat chamber is connected to the lower chamber; The upper spray arm body and the upper spray arm connecting sleeve have a connected upper chamber, the upper chamber is connected to the lower chamber, and water enters the upper chamber through the spray arm seat chamber and the lower chamber; A ball assembly is provided at the connection point between the upper spray arm and the lower spray arm, and / or at the connection point between the lower spray arm and the spray arm seat; The ball assembly comprises: a ball, an inner sleeve and an outer sleeve, wherein the inner sleeve is arranged on the inner side of the ball, and the outer sleeve is arranged on the outer side of the ball.

2. The washing appliance according to claim 1, characterized in that: The ball assembly also includes: an intermediate sleeve, the inner sleeve is arranged on the inner side of the outer sleeve, the intermediate sleeve is arranged between the outer sleeve and the inner sleeve, a plurality of ball holes are arranged on the intermediate sleeve, the balls are installed in the ball holes, and the balls protrude from the inner circumference and outer circumference of the intermediate sleeve in the radial direction of the intermediate sleeve.

3. The washing appliance according to claim 1, characterized in that: An inner sleeve ball groove suitable for cooperating with the ball is arranged on the outer circumferential surface of the inner sleeve, and an outer sleeve ball groove suitable for cooperating with the ball is arranged on the inner circumferential surface of the outer sleeve.

4. The washing appliance according to claim 1, characterized in that: The ball assembly includes a first ball assembly, which is arranged at the connection between the upper spray arm connecting sleeve and the lower spray arm upper connecting sleeve. The first ball assembly includes a first ball, a first inner sleeve and a first outer sleeve. The first inner sleeve is arranged on the inner side of the first outer sleeve. The upper spray arm is provided with a second driving hole for driving the upper spray arm to rotate around a second direction.

5. The washing appliance according to claim 1, characterized in that: The ball assembly includes a second ball assembly, which is arranged at the connection between the spray arm and the spray arm seat. The second ball assembly includes a second ball, a second inner sleeve and a second outer sleeve. The second inner sleeve is arranged on the inner side of the second outer sleeve. The lower spray arm is provided with a first driving hole for driving the lower spray arm to rotate around a first direction.

6. The washing appliance according to claim 4, characterized in that: The first ball assembly includes a first intermediate sleeve, which is arranged between the first outer sleeve and the first inner sleeve. The first intermediate sleeve is provided with a plurality of first ball holes, the first balls are installed in the first ball holes, and the first balls protrude from the inner circumference and the outer circumference of the first intermediate sleeve in the radial direction of the first intermediate sleeve.

7. The washing appliance according to claim 6, characterized in that: The upper connecting sleeve of the lower spray arm is sleeved on the outer side of the upper spray arm connecting sleeve, the first inner sleeve cooperates with the upper spray arm connecting sleeve, and the first outer sleeve cooperates with the upper connecting sleeve of the lower spray arm.

8. The washing appliance according to claim 6, characterized in that: A first inner sleeve ball groove suitable for cooperating with the first ball is arranged on the outer circumferential surface of the first inner sleeve, and a first outer sleeve ball groove suitable for cooperating with the first ball is arranged on the inner circumferential surface of the first outer sleeve.

9. The washing appliance according to claim 8, characterized in that: The first outer sleeve ball groove and the first inner sleeve ball groove are both circumferential annular grooves.

10. The washing appliance according to claim 4, characterized in that: The first ball hole is arranged at the top of the first intermediate sleeve, the first ball hole is a superior arc hole, and a first ball taking-in and putting-out opening is formed at the top notch of the first ball hole. And / or, a first weakened groove is arranged between two adjacent first ball holes.

11. The washing appliance according to claim 5, characterized in that: The second ball assembly also includes: a second intermediate sleeve, which is arranged between the second outer sleeve and the second inner sleeve, and the second intermediate sleeve is provided with a plurality of second ball holes, the second balls are installed in the second ball holes, and the second balls protrude from the inner circumference and outer circumference of the second intermediate sleeve in the radial direction of the second intermediate sleeve.

12. The washing appliance according to claim 11, characterized in that: The spray arm seat body is sleeved on the outer side of the lower connection sleeve of the lower spray arm, the second inner sleeve cooperates with the lower connection sleeve of the lower spray arm, and the second outer sleeve cooperates with the spray arm seat body.

13. The washing appliance according to claim 11, characterized in that: A second inner sleeve ball groove suitable for cooperating with the second ball is arranged on the outer circumferential surface of the second inner sleeve, and a second outer sleeve ball groove suitable for cooperating with the second ball is arranged on the inner circumferential surface of the second outer sleeve.

14. The washing appliance according to claim 13, characterized in that: In the direction of the central axis of the lower connecting sleeve of the lower spray arm, the positions of the second outer sleeve ball groove, the second inner sleeve ball groove, and the second ball hole correspond to each other. And / or, the second inner sleeve ball groove and the outer sleeve ball groove are both circumferential annular grooves.

15. The washing appliance according to claim 11, characterized in that: The second ball hole is arranged at the top of the second intermediate sleeve, the second ball hole is a superior arc hole, and a second ball taking-in and putting-out opening is formed at the top notch of the second ball hole. And / or, a second weakened groove is provided between two adjacent second ball holes.

16. The washing appliance according to claim 1, characterized in that: The first direction in which the lower spray arm rotates is opposite to the second direction in which the upper spray arm rotates.

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