CN117752276A - Spray arm assembly and dish washer - Google Patents

Abstract

The invention discloses a spray arm assembly and a dish washer, wherein the spray arm assembly comprises a spray arm seat, a rotating shaft, a main spray arm, an auxiliary spray arm and a transmission device, the spray arm seat is provided with a central hole, the rotating shaft penetrates through the central hole, the main spray arm is fixedly connected to the end part of the rotating shaft, the main spray arm is provided with a second shaft, and the auxiliary spray arm is rotatably connected to the main spray arm; the transmission device comprises a central gear sleeved in the middle of the rotating shaft, a rotary table gear and a pinion sleeved on the second shaft, the central gear is relatively fixed with the spray arm seat, the rotary table gear can rotate relative to the rotating shaft, the central gear and the rotary table gear are both meshed with the pinion, the number of teeth of the central gear is different from the number of teeth of the rotary table gear by one, the rotary table gear is provided with a triggering part, and the triggering part is used for pushing the auxiliary spray arm to rotate so as to change the water spraying direction. The pinion revolves around the central gear and rotates simultaneously, and when the pinion revolves around the central gear for one circle, the turntable gear rotates by an angle corresponding to one tooth, and the turntable gear pushes the auxiliary spray arm to rotate through the triggering part so as to enable water spraying to swing.

Description

Spray arm assembly and dish washer

Technical Field

The invention relates to the technical field of household appliances, in particular to a spray arm assembly and a dish washer.

Background

With the improvement of living standard, dish-washing machines capable of freeing hands are becoming standard of quality living gradually. Compared with the traditional hand washing, the dish washing machine has the advantages of cleaning, sterilizing, saving water and labor and the like. The dish washer generally adopts a spraying mode, water flow is sprayed through a rotating spray arm assembly under the drive of a washing pump, the surface of tableware is washed, and the cleaning effect is closely related to the design of the spray arm.

In the related art, the spray arm assembly has single spraying effect and poor flushing effect, and needs to be improved.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides the spray arm assembly which can effectively improve the scouring effect on tableware.

The invention also provides a dish washer with the spray arm assembly.

According to the first aspect of the invention, the spray arm assembly comprises a spray arm seat, a rotating shaft, a main spray arm, an auxiliary spray arm and a transmission device, wherein the spray arm seat is provided with a central hole, the rotating shaft penetrates through the central hole, the main spray arm is fixedly connected to the end part of the rotating shaft, the main spray arm is provided with a second shaft, and the auxiliary spray arm is rotatably connected to the main spray arm; the driving device comprises a central gear sleeved in the middle of the rotating shaft, a rotary table gear and a pinion sleeved on the second shaft, the central gear is relatively fixed with the spray arm seat, the rotary table gear is relatively rotatable with respect to the rotating shaft, the central gear and the rotary table gear are both meshed with the pinion, the number of teeth of the central gear is different from the number of teeth of the rotary table gear by one, the rotary table gear is provided with a triggering part, and the triggering part is used for pushing the auxiliary spray arm to rotate so as to change the water spraying direction.

The spray arm assembly provided by the embodiment of the first aspect of the invention has at least the following beneficial effects: the main spray arm and the auxiliary spray arm drive the rotating shaft to rotate, namely the second shaft rotates around the rotating shaft, and because the central gear is fixed, the pinion rotates simultaneously and revolves around the central gear, the central gear and the turntable gear differ by one tooth, according to the Fressen gear transmission paradox, the pinion rotates around the central gear for one circle, and then the turntable gear rotates by one tooth to correspond to the angle, namely the turntable gear slowly rotates, and the turntable gear pushes the auxiliary spray arm to rotate through the triggering part, so that water flow sprayed by the auxiliary spray arm swings, tableware is washed from different angles, the washing effect on the tableware is effectively improved, and the washing efficiency of a dish washer is improved.

According to some embodiments of the first aspect of the present invention, the trigger portion is a first protrusion provided on an end surface of the turntable gear, the first protrusion facing the sub-spray arm, and the sub-spray arm is provided with a second protrusion matching the first protrusion.

According to some embodiments of the first aspect of the present invention, the rotation axis of the secondary spray arm is perpendicular to the axis of the rotating shaft, and the second protrusion is located at a side of the secondary spray arm.

According to some embodiments of the first aspect of the invention, the turntable gear is provided with a plurality of the first protrusions, the plurality of first protrusions being distributed along a circumferential direction of the turntable gear.

According to some embodiments of the first aspect of the invention, an annular side plate is provided on the outer periphery of the turntable gear, and the plurality of first protrusions are provided on the annular side plate.

According to some embodiments of the first aspect of the present invention, the sun gear is provided with a plurality of support plates, the plurality of support plates surrounds the spray arm base, the support plates are provided with first buckles, and the spray arm base is provided with second buckles matched with the first buckles.

According to some embodiments of the first aspect of the invention, the outer wall of the spindle is provided with a support ring, and the sun gear is provided with a groove for mating with the support ring.

According to some embodiments of the first aspect of the present invention, two end surfaces of the supporting ring are respectively abutted against the sun gear and the spray arm seat.

According to some embodiments of the first aspect of the invention, the turntable gear is provided with a convex ring facing the sun gear, the end surface of the convex ring being an arc surface and abutting the sun gear.

According to some embodiments of the first aspect of the present invention, the second buckle is a third protrusion of an outer wall of the spray arm base, the sun gear is provided with a plurality of positioning plates arranged at intervals, and the third protrusion is clamped between two adjacent positioning plates.

According to some embodiments of the first aspect of the present invention, an outer wall of an end portion of the rotating shaft is provided with a protruding clamping block, and the main spray arm is provided with a clamping groove matched with the clamping block.

According to some embodiments of the first aspect of the present invention, an end portion of the rotating shaft is provided with a neck portion that is retracted, the clamping block is located on an outer wall of the neck portion, and the main spray arm is provided with a receiving groove for receiving the neck portion.

According to some embodiments of the first aspect of the present invention, the inner walls of the central holes of the central gear and the turntable gear are provided with avoiding grooves for the fixture block to pass through.

According to some embodiments of the first aspect of the invention, the second shaft is provided with an axial elastic groove, the outer wall of the second shaft is provided with a baffle ring, the diameter of the baffle ring is larger than the diameter of the central hole of the pinion, and the periphery of the baffle ring is provided with a guiding inclined plane.

According to some embodiments of the first aspect of the invention, the axis of rotation of the secondary spray arm is perpendicular to the axis of the spindle.

A dishwasher according to an embodiment of a second aspect of the invention comprises a spray arm assembly according to an embodiment of the first aspect.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

Additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a schematic view of a spray arm assembly according to an embodiment of the first aspect of the present invention;

FIG. 2 is an exploded view of a spray arm assembly according to an embodiment of the first aspect of the present invention;

FIG. 3 is a second exploded view of a spray arm assembly according to an embodiment of the first aspect of the present invention;

FIG. 4 is a front view cross-section of a spray arm assembly according to an embodiment of the first aspect of the invention;

FIG. 5 is an enlarged view of a portion of FIG. 4 at A;

FIG. 6 is a bottom view of a spray arm assembly according to an embodiment of the first aspect of the present invention;

FIG. 7 is a left side view of a spray arm assembly according to an embodiment of the first aspect of the present invention;

FIG. 8 is a schematic structural view of a spray arm base according to an embodiment of the first aspect of the present invention;

FIG. 9 is a schematic diagram of a structure of a rotor in an embodiment of the first aspect of the present invention;

FIG. 10 is a schematic view of a sun gear according to an embodiment of the first aspect of the present invention;

FIG. 11 is a schematic view of a gear wheel in the first embodiment of the present invention;

fig. 12 is a schematic structural view of a main spray arm according to an embodiment of the first aspect of the present invention.

The reference numerals are as follows:

the spray arm seat 100, the center hole 101, the second buckle 102 and the limiting ring 103;

the water delivery device comprises a rotating shaft 200, a water delivery channel 201, a supporting ring 202, a clamping block 203, a neck 204 and a convex edge 205;

the main spray arm 300, the first cavity 301, the first spray hole 302, the mounting seat 310, the mounting post 311, the inner cavity 312, the clamping groove 313, the second shaft 320, the baffle ring 321 and the elastic groove 322;

the auxiliary spray arm 400, the second cavity 401, the second spray hole 402, the bearing 410 and the second bulge 420;

the device comprises a transmission device 500, a central gear 510, a support plate 511, a first buckle 512, a groove 513, a positioning plate 514, a turntable gear 520, a trigger part 521, an annular side plate 522, an annular convex rib 523, a convex ring 524 and a pinion gear 530.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

In the description of the present invention, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, the description of the first and second is only for the purpose of distinguishing technical features, and should not be construed as indicating or implying relative importance or implying the number of technical features indicated or the precedence of the technical features indicated.

In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

A dishwasher is a device for automatically washing dishes such as bowls, chopsticks, plates, dishes, knives, forks, etc. The full-automatic dish-washing machine on the market can be divided into two types, namely household dish-washing machine and commercial dish-washing machine, the household dish-washing machine is suitable for most families at present, the dish-washing machine can replace hand washing, hands of people are liberated, and the dish-washing machine is gradually becoming standard of quality life. Compared with the traditional dish and chopsticks washing by hand, the dish washing machine has the advantages of cleaning, sterilizing, saving water and labor and the like. In the related art, a dishwasher generally adopts a spray arm assembly to spray, water flows are sprayed through the rotary spray arm assembly under the drive of a washing pump, the surface of tableware is washed, the washing effect of the dishwasher is closely related to the design of the spray arm, the spraying effect of the existing spray arm assembly is single, the washing effect is poor, and the dishwasher needs to be improved.

Referring to fig. 1 to 5, an embodiment of the first aspect of the present invention provides a spray arm assembly for a dishwasher, which generally has an upper spray arm assembly and a lower spray arm assembly, and washes dishes from two directions, respectively, the spray arm assembly of the first aspect of the present invention may be used as an upper spray arm assembly or a lower spray arm assembly, hereinafter, the spray arm assembly will be described as an example, the spray arm assembly includes a spray arm seat 100, a rotating shaft 200, a main spray arm 300, and an auxiliary spray arm 400, the spray arm seat 100 is fixedly installed on the dishwasher, the spray arm seat 100 is fixed in operation, a through center hole 101 is provided at the center of the spray arm assembly, the rotating shaft 200 is installed in the center hole 101 and can rotate, a water delivery channel 201 axially arranged is provided inside the rotating shaft 200, the water delivery channel 201 extends through both ends of the rotating shaft 200, the main spray arm 300 has a mounting seat 310, the mounting seat 310 is fixedly connected to the upper end of the rotating shaft 200, the mounting seat 310 is provided with a mounting post 311, a bearing 410 is installed on the mounting post 311, the auxiliary spray arm 400 is installed on the rotating shaft 400, and the rotating shaft 400 is perpendicular to the rotating axis 410 through the bearing 400.

It can be understood that the first cavity 301 is formed in the main spray arm 300, the second cavity 401 is formed in the sub spray arm 400, the mounting seat 310 is provided with the inner cavity 312, the first cavity 301 and the second cavity 401 are communicated with the water delivery channel 201 through the inner cavity 312, the main spray arm 300 is formed with a plurality of first spray holes 302 communicated with the first cavity 301, the sub spray arm 400 is formed with a plurality of second spray holes 402 communicated with the second cavity 401, and the washing water path is input from the water delivery channel 201 of the rotating shaft 200, is branched to the first cavity 301 of the main spray arm 300 and the second cavity 401 of the sub spray arm 400, and is sprayed from the first spray holes 302 and the second spray holes 402 to spray and wash tableware.

As shown in fig. 1, the main spray arm 300 is provided with five first spray holes 302, the directions of the five first spray holes 302 are consistent and inclined, and the high-speed water sprayed from the five first spray holes 302 corresponding to the rotation direction of the rotating shaft 200 washes tableware, so that a uniform spray effect is achieved; the auxiliary spray arm 400 is provided with five second spray holes 402, the orientations of the five second spray holes 402 are all inclined, the spraying directions of the 1 st and 2 nd second spray holes 402 are consistent along the direction away from the mounting seat 310 and face inwards, the spraying directions of the 3 rd and 4 th second spray holes 402 are consistent and face outwards, the spraying direction of the 5 th second spray hole is far away from the axis of the rotating shaft 200, when the auxiliary spray arm 400 rotates, the five second spray holes 402 spray water flows in various directions, and various-direction scouring is applied to tableware, so that the washing effect is better.

The spray arm assembly is connected with a transmission device 500, the transmission device 500 comprises a central gear 510, a rotary table gear 520 and a pinion gear 530, the central gear 510 and the rotary table gear 520 are sleeved on the middle of the rotating shaft 200, the main spray arm 300 is provided with a second shaft 320 parallel to the rotating shaft 200, the second shaft 320 is positioned on the outer side of the rotating shaft 200, and the pinion gear 530 is sleeved on the second shaft 320. The sun gear 510 is fixed, like the boom seat 100, the turntable gear 520 is rotatable about the rotation axis 200, the pinion gear 530 is rotatable about the second axis 320, the sun gear 510 and the turntable gear 520 are both engaged with the pinion gear 530, and the sun gear 510 has one more tooth or one less tooth than the turntable gear 520. It should be understood that, as shown in fig. 6, although the sun gear 510 is different from the turntable gear 520, the tooth distances of the sun gear 510 and the turntable gear 520 are relatively close, and the meshing point of the sun gear 510 and the turntable gear 520 is only 2 to 3 teeth, so that the sun gear 510 and the turntable gear 520 can be meshed with the pinion gear 530 at the same time and realize transmission.

It can be understood that the turntable gear 520 is located above the central gear 510 and is close to the secondary spray arm 400, and a trigger portion 521 is disposed on an upper end surface of the turntable gear 520, and the trigger portion 521 is used to push the secondary spray arm 400 to rotate around the mounting post 311, so that the direction of the water flow sprayed from the second spray hole 402 is changed.

It will be appreciated that the main spray arm 300 and the auxiliary spray arm 400 rotate the rotating shaft 200 under the reaction force of the sprayed water flow, that is, the second shaft 320 rotates around the rotating shaft 200, because the central gear 510 is fixed, the pinion 530 revolves around the central gear 510 and rotates around the second shaft 320 at the same time, the transmission device 500 is designed according to the frarson gear transmission paradox, the pinion 530 rotates around the central gear 510 for one circle, the number of teeth of the rotary table 520 and the central gear 510 are the same, and the rotary table 520 rotates by one tooth more than the rotary table 520, that is, the rotary table 520 rotates slowly relative to the central gear 510, and the rotary table 520 rotates by one tooth when the pinion 530 rotates around the central gear 510, so that the rotary table 520 rotates by one tooth with the rotary table 400 at different speeds of the auxiliary spray arm 400, and the rotary table 520 pushes the auxiliary spray arm 400 to rotate by a certain angle around the mounting post 311 through the trigger 521 in the process of relative rotation, so that the water flow sprayed by the second 402 of the auxiliary spray arm 400 swings, the water flow from different angles can promote the washing efficiency of the dish washing machine, and the dish washing efficiency of the dish washing machine can be improved effectively, and the efficiency of the dish washing can be improved.

Referring to fig. 7, it can be understood that the trigger portion 521 adopts a first protrusion disposed on the turntable gear 520, the first protrusion extends toward the auxiliary spray arm 400, and has a curved surface with a circular arc shape, the auxiliary spray arm 400 is provided with a second protrusion 420, the second protrusion 420 protrudes toward the turntable gear 520, and the turntable gear 520 and the rotating shaft 200 have different rotation speeds and opposite directions, so that the first protrusion contacts with the second protrusion 420 during the relative rotation, and pushes the auxiliary spray arm 400 to rotate around the mounting post 311 by a certain angle, thereby realizing the swinging of the water flow ejected by the second spray orifice 402 of the auxiliary spray arm 400, and improving the scouring effect on tableware.

Referring to fig. 7, it can be appreciated that the second protrusion 420 is offset from the axis of the sub-boom 400 and is disposed at a side of the sub-boom 400. When the second protrusion 420 passes through the position where the first protrusion is located, since the second protrusion 420 is disposed on the side edge of the auxiliary spray arm 400, the first protrusion pushes the auxiliary spray arm 400 to rotate by a certain angle through the second protrusion 420, so that the water flow sprayed out of the second spray hole 402 swings, the flushing angle is changed, and the flushing effect on tableware is improved.

Referring to fig. 11, it can be understood that the upper end surface of the turntable gear 520 is provided with five first protrusions, the five first protrusions are circumferentially distributed at the edge of the turntable gear 520, and the five first protrusions may be uniformly spaced to distribute the turntable gear 520 to rotate with the rotating shaft 200 relatively for one turn, so that the turntable gear 520 pushes the auxiliary spray arm 400 to change the direction of spraying water for five times through the five first protrusions, and because the rotating speeds of the turntable gear 520 and the rotating shaft 200 are different, the frequency of changing the direction of spraying water is also changed, and various washings are applied to tableware, thereby being beneficial to improving the washout effect and being cleaner and faster. The five first bulges can also be unevenly distributed at intervals, so that the change frequency of the water spraying direction is further changed, and the scouring effect is better.

Referring to fig. 11, it can be understood that an annular side plate 522 is disposed on the outer periphery of the turntable gear 520, the annular side plate 522 and the five first protrusions are integrally formed on the turntable gear 520, and the annular side plate 522 serves as a reinforcing rib to improve the structural strength of the turntable gear 520. The upper end face of the turntable gear 520 is also provided with an annular convex rib 523, and the annular convex rib 523 surrounds the central hole of the turntable gear 520, so that the structural strength is increased, and the risk of cracking is reduced.

It can be understood that the triggering portion 521 may also adopt a convex edge disposed on the upper end surface, the upper edge of the convex edge is a continuously variable curved surface, when the high point of the curved surface contacts with the auxiliary spray arm 400, the auxiliary spray arm 400 is pushed to rotate around the mounting post 311 by a certain angle, and the low point of the curved surface is reserved with the auxiliary spray arm 400 to form a gap without contacting with the auxiliary spray arm 400. The water flow sprayed out of the second spray hole 402 can swing, the flushing angle is changed, and the flushing effect on tableware is improved.

Referring to fig. 2 to 5, it can be understood that a connection structure is provided between the sun gear 510 and the spray arm base 100, the sun gear 510 is provided with a plurality of support plates 511 surrounding the spray arm base 100, the side walls of the support plates 511 facing the spray arm base 100 are provided with first buckles 512, the outer walls of the spray arm base 100 are provided with second buckles 102, and after assembly, the first buckles 512 of the support plates 511 buckle the second buckles 102, so as to realize connection between the sun gear 510 and the spray arm base 100 and help to position the axial position of the sun gear 510.

Referring to fig. 2 to 5, it can be understood that a radially protruding support ring 202 is formed on the outer wall of the rotation shaft 200, a groove 513 is provided on the sun gear 510, the support ring 202 is received in the groove 513, the support ring 202 is disposed under the sun gear 510, and the sun gear 510 is supported by the support ring 202 while defining an axial position. The upper end surface of the boom seat 100 abuts against the lower end surface of the support ring 202, and the boom seat 100 and the sun gear 510 sandwich the support ring 202. In the axial direction of the rotating shaft 200, the spray arm seat 100 supports the sun gear 510 through the supporting ring 202, and the first buckle 512 of the sun gear 510 buckles the second buckle 102 of the spray arm seat 100, so that the sun gear 510, the rotating shaft 200 and the spray arm seat 100 are connected into an integrated structure. The contact surfaces of the support ring 202, the spray arm seat 100 and the sun gear 510 are smooth surfaces, so that the rotating shaft 200 can rotate smoothly.

It can be appreciated that the lower end surface of the turntable gear 520 is provided with a convex ring 524, the end surface of the convex ring 524 is an arc surface, the arc surface is abutted against the upper end surface of the sun gear 510, the upper end surface of the sun gear 510 is a smooth plane, and the friction between the convex ring 524 and the upper end surface of the sun gear 510 is small, which is beneficial to the rotation of the turntable gear 520. And the central gear 510 supports the rotary table gear 520 by utilizing the convex ring 524, and the mounting seat 310 is abutted against the upper end surface of the rotary table gear 520, so that the rotary table gear 520 is limited, the rotary table gear 520 is stable in position, and the triggering part 521 is beneficial to pushing the auxiliary spray arm 400 to rotate around the mounting post 311.

Referring to fig. 10, it can be understood that the sun gear 510 is provided with four positioning plates 514 surrounding the spray arm base 100, the four positioning plates 514 are circumferentially spaced, as shown in fig. 8, the second hooks 102 are third protrusions on the outer wall of the spray arm base 100, and the number of the second hooks 102 is two, and two adjacent positioning plates 514 clamp one third protrusion, thereby defining the relative angle between the sun gear 510 and the spray arm base 100, so that the sun gear 510 is stationary relative to the spray arm base 100. The four positioning plates 514 surround and fit the spray arm base 100, which is beneficial to improving the stability of the sun gear 510 and preventing shaking. Each positioning plate 514 is connected to the sun gear 510 by a reinforcing rib, improving the structural strength and rigidity of the positioning plate 514.

Of course, the second buckle 102 may also be a buckle slot or pin on the outer wall of the spray arm base 100, and can also cooperate with the first buckle 512 to achieve the buckling connection.

Referring to fig. 3 and 5, it can be understood that the outer wall of the upper end of the rotating shaft 200 is provided with four clamping blocks 203 uniformly distributed in the circumferential direction, the clamping blocks 203 protrude along the radial direction of the rotating shaft 200, the mounting seat 310 is provided with a clamping groove 313, and after the rotating shaft 200 is assembled with the mounting seat 310, the clamping blocks 203 are clamped into the clamping groove 313, so that the fixed connection between the rotating shaft 200 and the mounting seat 310 is realized. The opening of the clamping groove 313 is arranged at one side deviating from the rotation direction of the mounting seat 310, the clamping block 203 cannot be separated after being mounted in the clamping groove 313, and the reliability in the use process is higher.

Referring to fig. 9, it can be understood that the upper end of the rotating shaft 200 is provided with a neck 204 that is retracted, four clamping blocks 203 are circumferentially and uniformly distributed on the outer wall of the neck 204, the mounting seat 310 is provided with a accommodating groove for accommodating the neck 204, and the clamping groove 313 is arranged on the inner wall of the accommodating groove. When assembled, the mounting seat 310 is sleeved on the neck 204, the mounting seat 310 is defined in the radial direction, and the mounting seat 310 is defined in the axial direction when the clamping block 203 is arranged in the clamping groove 313, so that the fixed connection between the rotating shaft 200 and the main spray arm 300 is realized. Because the neck 204 is of a retracted structure, a step is formed at the lower end of the neck 204, and the step and the clamping block 203 cooperate to clamp a part of the mounting seat 310, so that the connection stability is further improved.

Referring to fig. 5 and 9, two convex edges 205 are further disposed on the outer wall of the rotating shaft 200, and the two convex edges 205 are both abutted against the inner wall of the central hole 101, so as to facilitate the concentricity of the rotating shaft 200 and the spray arm seat 100, reduce the contact area between the rotating shaft 200 and the spray arm seat 100, and facilitate the smooth rotation of the rotating shaft 200. The inner wall of the central hole 101 is also provided with a limiting ring 103, the lower end of the rotating shaft 200 is abutted against the limiting ring 103, the rotating shaft 200 is supported by the limiting ring 103, and the limiting ring 103 and the central gear 510 are matched to clamp the rotating shaft 200, so that the axial positioning accuracy is improved.

Referring to fig. 10 and 11, considering that the sun gear 510 and the turntable gear 520 are first mounted on the rotation shaft 200 in assembly, and then the mounting seat 310 is mounted on the upper end of the rotation shaft 200, in order that the rotation shaft 200 can smoothly pass through the central holes of the sun gear 510 and the turntable gear 520, the inner walls of the central holes of the sun gear 510 and the turntable gear 520 are respectively provided with an avoidance groove, and the avoidance grooves are matched with the shape and the position of the clamping blocks 203, so that the clamping blocks 203 can pass through, and the clamping blocks 203 can be prevented from interfering with the sun gear 510 and the turntable gear 520.

Referring to fig. 2, 3 and 12, it can be appreciated that the outer wall of the second shaft 320 is provided with two baffle rings 321, the diameters of the two baffle rings 321 are both larger than the central hole diameter of the pinion gear 530, and the two baffle rings 321 cooperate to sandwich the pinion gear 530 to define the pinion gear 530 in the axial direction, preventing the pinion gear 530 from being separated from the second shaft 320. In order to facilitate the installation, the lower end surface of the second shaft 320 is provided with an elastic groove 322, the elastic groove 322 extends along the axial direction of the second shaft 320, the periphery of the baffle ring 321 positioned below is provided with a guide inclined plane, when the pinion 530 is installed, the central hole of the pinion 530 is aligned with the second shaft 320, and due to the existence of the elastic groove 322, the pinion 530 can push the second shaft 320 to shrink by utilizing the guide inclined plane, so that the baffle ring 321 positioned below penetrates through the central hole of the pinion 530 to complete the installation, and the operation is convenient. After installation, the second shaft 320 is automatically reset due to elasticity, and the lower baffle ring 321 blocks the pinion gear 530 to prevent the falling-out.

An embodiment of a second aspect of the present invention proposes a dishwasher, comprising a spray arm assembly according to the embodiment of the first aspect, the spray arm assembly comprising a spray arm seat 100, a rotating shaft 200, a main spray arm 300, an auxiliary spray arm 400 and a transmission device 500, the spray arm seat 100 being fixedly mounted on the dishwasher, a water delivery channel 201 being axially arranged inside the rotating shaft 200, the water delivery channel 201 penetrating to both ends of the rotating shaft 200, the main spray arm 300 having a mounting seat 310, the mounting seat 310 being fixedly connected to the upper end of the rotating shaft 200.

It can be understood that the first cavity 301 is formed in the main spray arm 300, the second cavity 401 is formed in the sub spray arm 400, the mounting seat 310 is provided with the inner cavity 312, the first cavity 301 and the second cavity 401 are communicated with the water delivery channel 201 through the inner cavity 312, the main spray arm 300 is formed with a plurality of first spray holes 302 communicated with the first cavity 301, the sub spray arm 400 is formed with a plurality of second spray holes 402 communicated with the second cavity 401, and the washing water path is input from the water delivery channel 201 of the rotating shaft 200, is branched to the first cavity 301 of the main spray arm 300 and the second cavity 401 of the sub spray arm 400, and is sprayed from the first spray holes 302 and the second spray holes 402 to spray and wash tableware.

The spray arm assembly is connected with a transmission device 500, the transmission device 500 comprises a central gear 510, a rotary table gear 520 and a pinion gear 530, the central gear 510 and the rotary table gear 520 are sleeved on the middle of the rotating shaft 200, the main spray arm 300 is provided with a second shaft 320 parallel to the rotating shaft 200, the second shaft 320 is positioned on the outer side of the rotating shaft 200, and the pinion gear 530 is sleeved on the second shaft 320. The sun gear 510 is fixed, like the boom seat 100, the dial gear 520 is rotatable about the rotation axis 200, the pinion gear 530 is rotatable about the second axis 320, the sun gear 510 and the dial gear 520 are both engaged with the pinion gear 530, and the sun gear 510 has one tooth more than the dial gear 520. It should be understood that, as shown in fig. 6, although the sun gear 510 is different from the turntable gear 520, the tooth distances of the sun gear 510 and the turntable gear 520 are relatively close, and the meshing point of the sun gear 510 and the turntable gear 520 is only 2 to 3 teeth, so that the sun gear 510 and the turntable gear 520 can be meshed with the pinion gear 530 at the same time and realize transmission.

It will be appreciated that the main spray arm 300 drives the rotating shaft 200 to rotate, that is, the second shaft 320 also rotates around the rotating shaft 200, because the central gear 510 is fixed, the pinion 530 revolves around the central gear 510 and rotates simultaneously, the transmission device 500 is designed according to the friendship's gear transmission paradox, the pinion 530 rotates around the central gear 510 for one circle, the turntable gear 520 and the central gear 510 cooperate with the pinion 530 for the same number of teeth, because the central gear 510 has one more tooth than the turntable gear 520, the turntable gear 520 rotates by one tooth more, that is, the turntable gear 520 rotates slowly relative to the central gear 510, the turntable gear 520 rotates by one tooth when the pinion 530 rotates around the central gear 510 for one circle, the turntable gear 520 rotates by one tooth different from the rotation speed of the auxiliary spray arm 400, and in the process of relative rotation, the turntable gear 520 pushes the auxiliary spray arm 400 to rotate by a certain angle around the mounting post 311 through the triggering part 521, thereby realizing the water flow sprayed out of the second spray hole of the auxiliary spray arm 400, the swaying water flow from different angles, effectively improving the effect on the tableware washing efficiency of the dish washing machine, and helping to promote the washing efficiency of the dish washing machine and saving energy.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention.

Claims (15)

1. Spray arm subassembly, its characterized in that includes:

the spray arm seat is provided with a central hole;

the rotating shaft penetrates through the central hole;

the main spray arm is fixedly connected to the end part of the rotating shaft and is provided with a second shaft;

the auxiliary spray arm is rotationally connected with the main spray arm;

the driving device comprises a central gear sleeved in the middle of the rotating shaft, a rotary table gear and a pinion sleeved on the second shaft, wherein the central gear is relatively fixed with the spray arm seat, the rotary table gear can rotate relative to the rotating shaft, the central gear and the rotary table gear are both meshed with the pinion, the number of teeth of the central gear is different from the number of teeth of the rotary table gear by one, the rotary table gear is provided with a triggering part, and the triggering part is used for pushing the auxiliary spray arm to rotate so as to change the water spraying direction.

2. The spray arm assembly of claim 1, wherein the trigger portion is a first protrusion disposed on the carousel gear end face, the first protrusion facing the secondary spray arm, the secondary spray arm being provided with a second protrusion that mates with the first protrusion.

3. The spray arm assembly of claim 2, wherein the axis of rotation of the secondary spray arm is perpendicular to the axis of the spindle, and the second protrusion is located on a side of the secondary spray arm.

4. A spray arm assembly according to claim 2 or 3, wherein the turntable gear is provided with a plurality of the first protrusions distributed along the circumference of the turntable gear.

5. The spray arm assembly of any one of claims 2 to 4, wherein an outer periphery of the carousel gear is provided with an annular side plate, the first protrusion being disposed on the annular side plate.

6. The spray arm assembly of any one of claims 1 to 5, wherein the sun gear is provided with a plurality of struts, a plurality of struts surrounding the spray arm mount, the struts being provided with first snaps, the spray arm mount being provided with second snaps that mate with the first snaps.

7. The spray arm assembly of claim 6, wherein the outer wall of the spindle is provided with a support ring and the sun gear is provided with a groove that mates with the support ring.

8. The spray arm assembly of claim 7, wherein the support ring has two end surfaces that abut the sun gear and the spray arm mount, respectively.

9. Spray arm assembly according to any of claims 6 to 8, characterized in that the turntable gear is provided with a collar facing the sun gear, the end face of the collar being circular arc and abutting against the sun gear.

10. The spray arm assembly according to any one of claims 6 to 9, wherein the second catch is a third protrusion on the outer wall of the spray arm socket, the sun gear being provided with a plurality of spaced apart locating plates, the third protrusion being captured between two adjacent locating plates.

11. The spray arm assembly of any one of claims 1 to 10, wherein an end outer wall of the spindle is provided with a raised latch, and the main spray arm is provided with a latch slot that mates with the latch.

12. The spray arm assembly of claim 11, wherein the end of the spindle is provided with a necked-in neck, the fixture block is located on an outer wall of the neck, and the main spray arm is provided with a receiving slot for receiving the neck.

13. The spray arm assembly of claim 11 or 12, wherein the central gear and the central bore inner wall of the carousel gear are each provided with a relief slot for the cartridge to pass through.

14. The spray arm assembly of any one of claims 1 to 13, wherein the second shaft is provided with an axial spring groove, an outer wall of the second shaft is provided with a baffle ring, a diameter of the baffle ring is larger than a diameter of a central hole of the pinion, and an outer periphery of the baffle ring is provided with a guide inclined surface.

15. Dishwasher, characterized by comprising a spray arm assembly according to any one of claims 1 to 14.