Spraying system of dish washing machine

Abstract

The utility model discloses a spraying system of a dish-washing machine, which comprises a water pipe assembly, a spraying assembly, a spraying assembly and a spraying assembly, the water pipe assembly comprises a main water pipe and a water receiving pipe, and the water inlet end of the water receiving pipe is communicated with the water inlet end of the main water pipe; the first spraying arm is rotationally connected with the main water pipe, the first spraying arm is provided with a first water inlet and a plurality of first spraying holes, and the first water inlet is communicated with the water outlet end of the main water pipe; the second spraying arm is rotationally connected with the first spraying arm and the water receiving pipe, the second spraying arm is provided with a second water inlet and a plurality of second spraying holes, and the second water inlet is communicated with the water outlet end of the water receiving pipe. According to the spraying system, the flushing angle is increased, the spraying mode is enriched, and the cleaning effect of the dish washing machine is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of dishwashers, in particular to a spray system of a dishwasher. Background Art

[0002] Household dishwashers typically use a spray of water, combined with cleaning supplies and heating, to clean contaminants from dishes. However, existing dishwashers have low water pressure in the middle waterway, and most central spray arms utilize a single circular spray pattern, limiting the rinse angle and position. This leaves many blind spots unreachable, such as the inner walls of deep containers. Summary of the Invention

[0003] The present invention aims to solve at least one of the problems existing in the existing related technologies to a certain extent. To this end, the present invention proposes a spray system for a dishwasher, which increases the flushing angle, enriches the spraying mode, and effectively improves the cleaning effect of the dishwasher.

[0004] According to the above-mentioned spray system of a dishwasher, it is implemented through the following technical solutions:

[0005] A dishwasher spray system includes a spray arm mechanism, the spray arm mechanism comprising: a water pipe assembly including a main water pipe and a water connection pipe, the water inlet end of the water connection pipe being connected to the main water pipe; a first spray arm rotatably connected to the main water pipe, the first spray arm having a first water inlet and a plurality of first spray holes, the first water inlet being connected to the water outlet end of the main water pipe; and a second spray arm rotatably connected to the first spray arm and the water connection pipe, the second spray arm having a second water inlet and a plurality of second spray holes, the second water inlet being connected to the water outlet end of the water connection pipe. Furthermore, the first spray arm can be linked to the rotation of the second spray arm when it rotates.

[0006] In some embodiments, a water outlet extending toward the water receiving pipe is fixedly provided on the main water pipe, and the water receiving pipe is mounted outside the water outlet and is detachably connected to the water outlet; and / or the second water inlet is arranged at the rear end of the second spray arm, and a water outlet joint is provided at the water outlet end of the water receiving pipe, and the water outlet joint is inserted into the second water inlet and is sealed with the second spray arm, and the second spray arm can rotate relative to the water outlet joint.

[0007] In some embodiments, a plurality of circumferentially spaced snap-in holes are provided on the outer wall of the water inlet end of the water receiving pipe, and an outwardly extending boss is fixedly provided at a position on the outer wall of the water outlet corresponding to the snap-in holes, and the boss is inserted into the snap-in holes; and / or a positioning notch is provided on the water inlet end of the water receiving pipe, and an outwardly extending positioning rib is fixedly provided at a position on the outer wall of the water outlet corresponding to the positioning notch, and the positioning rib is inserted into the positioning notch.

[0008] In some embodiments, the second spray arm is arranged side by side with the main water pipe, and the rotation axis of the first spray arm and the rotation axis of the second spray arm are perpendicular to each other; and / or the angle range between the direction of the first spray hole and the rotation plane of the first spray arm is 40-90°, and the angle range between the direction of the second spray hole and the rotation plane of the second spray arm is 0-50°.

[0009] In some embodiments, the first spray arm includes a main spray arm and a turntable, the main spray arm is rotatably connected to the main water pipe and is provided with the first water inlet and multiple first spray holes, the turntable is fixedly connected to the main spray arm, and a variable pitch spiral rib is provided on the side of the turntable away from the main spray arm; the second spray arm includes an auxiliary spray arm and a gear, the auxiliary spray arm is arranged outside the side of the turntable away from the main spray arm and is rotatably connected to the water receiving pipe, the auxiliary spray arm is provided with the second water inlet and multiple second spray holes, and the gear is arranged on the auxiliary spray arm and engages with the variable pitch spiral rib.

[0010] In some embodiments, the variable-pitch spiral rib has a coil count of greater than or equal to one; the gear has teeth evenly arranged along the circumferential direction, and the distance between adjacent coils is n times the arc length between adjacent teeth. Furthermore, n is 1-5.

[0011] In some embodiments, the turntable is coaxially arranged with the first water inlet, and at least two mounting portions are provided on the turntable. At least two of the mounting portions are circumferentially spaced apart and radially inward of the variable pitch spiral rib and fixedly connected to the main spray arm.

[0012] In some embodiments, the turntable includes an inner ring, an outer ring and a plurality of connecting ribs, the outer ring is arranged outside the inner ring, and the plurality of connecting ribs are circumferentially spaced between the inner ring and the outer ring, the opposite ends of the connecting ribs in the radial direction are fixedly connected to the inner ring and the outer ring respectively, and a variable pitch spiral rib is provided on the side of the outer ring away from the main spray arm.

[0013] In some embodiments, the auxiliary spray arm includes a first spray arm body having a plurality of the second spray holes, the rear end of the first spray arm body is connected to the water receiving pipe, and the first spray arm body can rotate relative to the water receiving pipe, and the gear is arranged at the front end or middle part of the first spray arm body.

[0014] In some embodiments, the auxiliary spray arm further includes a second spray arm body having a plurality of the second spray holes and a connecting pipe, the front end of the first spray arm body is connected to the rear end of the second spray arm body through the connecting pipe, and the gear is arranged on the periphery of the connecting pipe.

[0015] In some embodiments, a bowl basket is further included, which is arranged on the top of the spray arm mechanism, the main water pipe is connected to the bowl basket, the water receiving pipe and the second spray arm are connected to the bowl basket through a connecting assembly, and the second spray arm can rotate relative to the connecting assembly.

[0016] In some embodiments, the connecting assembly includes at least a first connecting block and a second connecting block, the first connecting block is clamped outside the second spray arm and connected to the bowl basket, and the second connecting block is clamped outside the water receiving pipe and connected to the bowl basket.

[0017] In some embodiments, the first connecting block is provided with a mounting groove, and a limiting groove is recessed on the bottom surface of the mounting groove, which is open upward and communicated with the mounting groove; the second spray arm is rotatably inserted into the mounting groove, and an annular rib is convexly provided on the outer side wall of the second spray arm at a position corresponding to the limiting groove, and the annular rib is rotatably inserted into the limiting groove.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] The spray system of the present invention is realized by rotating the first spray arm to be connected to the main water pipe, and rotating the second spray arm to be connected to the first spray arm and the water connecting pipe respectively. The main water pipe is connected to the second spray arm through the water connecting pipe, so that water is supplied to the first spray arm and the second spray arm respectively through the main water pipe. With the cooperation of the first spray arm and the second spray arm, the flushing angle can be increased, the spraying mode can be enriched, and the cleaning effect of the dishwasher can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of the spray arm mechanism in Example 1 of the present utility model;

[0021] Figure 2 This is an exploded view of the spray arm mechanism in Example 1 of the present utility model;

[0022] Figure 3 This is a cross-sectional view of the spray arm mechanism in Example 1 of the present utility model;

[0023] Figure 4 This is a cross-sectional view of the main water pipe in Example 1 of the present utility model;

[0024] Figure 5 This is a schematic structural diagram of the water connection pipe in Example 1 of the present utility model;

[0025] Figure 6 This is a schematic structural diagram of the first connecting block and the second connecting block in Example 1 of the present utility model;

[0026] Figure 7 This is a schematic structural diagram of the turntable in Example 1 of the present utility model;

[0027] Figure 8 This is a top view of the turntable in Example 1 of the present utility model;

[0028] Figure 9 This is a schematic structural diagram of the connecting pipe and gear in Example 1 of the present utility model;

[0029] Figure 10 This is a front view of the connecting pipe and gear in Example 1 of the present utility model;

[0030] Figure 11 This is a schematic structural diagram of the spray system in Example 1 of the present utility model;

[0031] Figure 12 It is a cross-sectional view of the spray arm mechanism in Example 2 of the present utility model.

[0032] In the figure: 1-first spray arm, 11-main spray arm, 111-first water inlet, 112-first spray hole, 12-rotating disk, 1201-variable pitch spiral rib, 1202-mounting part, 1203-center hole, 1204-grid hole, 1205-air-avoiding part, 121-inner ring, 122-outer ring, 123-connecting rib, 124-reinforcement rib;

[0033] 2 - second spray arm, 21 - auxiliary spray arm, 2101 - second water inlet, 2102 - second spray hole, 2103 - second flow channel, 2104 - annular rib, 211 - first spray arm body, 212 - second spray arm body, 213 - connecting pipe, 22 - gear, 221 - gear teeth;

[0034] 3- water pipe assembly, 31- main water pipe, 311- water outlet, 312- boss, 313- positioning rib, 32- water connecting pipe, 321- water outlet joint, 322- clamping hole, 323- positioning notch, 324- annular flange;

[0035] 4-rotating shaft assembly;

[0036] 5-connection assembly, 51-first connection block, 511-installation slot, 512-limiting slot, 513-clamping slot, 52-second connection block;

[0037] 6-bowl basket, 61-bottom wire. DETAILED DESCRIPTION

[0038] The following examples illustrate the present invention, but the present invention is not limited by these examples. Modifications to the specific embodiments of the present invention or equivalent replacements of some technical features without departing from the spirit of the present invention should be included in the scope of the technical solution claimed in the present invention.

[0039] Example 1

[0040] refer to Figure 1-3 This embodiment provides a spray system for a dishwasher, comprising a spray arm mechanism (not shown) and a bowl basket 2. The spray arm mechanism comprises a first spray arm 1, a second spray arm 2, a water pipe assembly 3, and a rotating shaft assembly 4. The water pipe assembly 3 comprises a main water pipe 31 and a water receiving pipe 32, the water inlet end of the water receiving pipe 32 being connected to the main water pipe 31. The first spray arm 1 is disposed below the main water pipe 31 and is rotatably connected to the main water pipe 31 via the rotating shaft assembly 4. The first spray arm 1 is provided with a first flow channel (not shown), a first water inlet 111, and a plurality of first spray holes 112. The first water inlet 111 is connected to the water outlet end of the main water pipe 31, and the first water inlet 111 is connected to the plurality of first spray holes via the first flow channel. The second spray arm 2 is arranged above the first spray arm 1 and is rotatably connected to the first spray arm 1 and the water receiving pipe 32 respectively. When the first spray arm 1 rotates, the second spray arm 2 can be linked to rotate. The second spray arm 2 is provided with a second flow channel 2103, a second water inlet 2101 and a plurality of second spray holes 2102. The second water inlet 2101 is connected to the water outlet end of the water receiving pipe 32, and the second water inlet 2101 is connected to the plurality of second spray holes 2102 through the second flow channel.

[0041] It can be seen that by rotating the first spray arm 1 to connect it to the main water pipe 31, and rotating the second spray arm 2 to connect it to the first spray arm 1 and the water receiving pipe 32 respectively, the main water pipe 31 can supply water to the first spray arm 1, and can also supply water to the second spray arm 2 through the water receiving pipe 32. With the joint cooperation of the first spray arm 1 and the second spray arm 2, the flushing angle can be increased, the spraying mode can be enriched, and the cleaning effect of the dishwasher can be effectively improved.

[0042] refer to Figure 1-5The main water pipe 31 is integrally formed with a water outlet 311 extending toward the water receiving pipe 32. The water inlet end of the water receiving pipe 32 is fitted over the water outlet 311 and is detachably connected thereto. The water receiving pipe 32 and the water outlet 311 can be detachably connected via a snap-fit structure, a clamp, or a threaded structure. In this embodiment, a second water inlet 2101 is disposed at the rear end of the second spray arm 2. A water outlet connector 321 is provided at the water outlet end of the water receiving pipe 32. The water outlet connector 321 is inserted into the second water inlet 2101 and is sealed with the second spray arm 2. The second spray arm 2 can rotate relative to the water outlet connector 321.

[0043] A snap-fit structure and a positioning structure are provided between the water inlet end of the water receiving pipe 32 and the water outlet 311. This allows the water receiving pipe 32 and the water outlet 311 to be quickly pre-positioned via the positioning structure, and prevents the water receiving pipe 32 from rotating relative to the main water pipe 31, resulting in a stable and reliable connection. The snap-fit structure includes a snap-fit hole 322 and a boss 312. The outer wall of the water inlet end of the water receiving pipe 32 is provided with a plurality of snap-fit holes 322 arranged circumferentially. An outwardly extending boss 312 is integrally formed and fixedly provided on the outer wall of the water outlet 311 at positions corresponding to the snap-fit holes 322. The boss 312 is inserted into the corresponding snap-fit hole 322, so that the water receiving pipe 32 is snap-fitted to the water outlet through the plurality of snap-fit holes 322 and the plurality of bosses 312 in conjunction with the water outlet. The positioning structure includes a positioning rib 313 and a positioning notch 323. A positioning notch 323 is provided at the water inlet end of the water receiving pipe 32, and an outward-extending positioning rib 313 is fixedly provided at a position corresponding to the positioning notch 323 on the outer wall of the water outlet 311. The positioning rib 313 is inserted into the positioning notch 323, thereby preventing the water receiving pipe 32 from rotating relative to the main water pipe 31.

[0044] refer to Figure 1-3 The second spray arm 2 is arranged side by side with the main water pipe 31, and the first spray arm 1 rotates around the rotating shaft assembly 4, and the second spray arm 2 rotates around the water outlet joint 321 of the water receiving pipe 32. The rotation axis of the second spray arm 2 is perpendicular to the rotation axis of the first spray arm 1. The angle between the orientation of the first spray hole 112 and the rotation plane of the first spray arm 1 is in the range of 40-90°, preferably 45-90°; the angle between the orientation of the second spray hole 2102 and the rotation plane of the second spray arm 2 is in the range of 0-50°, preferably 0-45°. This allows the spraying water jets of the first spray arm 1 and the second spray arm 2 to intersect, enriching the spray diversity and effectively enhancing the cleaning effect of the dishwasher. In particular, the rotation plane of the first spray arm 1 is a horizontal plane, which is perpendicular to the rotation axis of the first spray arm 1; the rotation plane of the second spray arm 2 is a similar vertical plane, and the rotation axis of the second spray arm 2 is perpendicular.

[0045] refer to Figure 1-3 and Figure 7-10The first spray arm 1 includes a main spray arm 11 and a turntable 12. The main spray arm 11 is rotatably connected to the main water pipe 31 via a rotating shaft assembly 4. The main spray arm 11 is provided with a first flow channel, a first water inlet 111, and a plurality of first spray holes 112. The turntable 12 is fixedly connected to the main spray arm 11 and is sleeved on the periphery of the rotating shaft assembly 4. The turntable 12 is located between the main spray arm 11 and the second spray arm 2. Since the turntable 12 is fixedly connected to the main spray arm 11, when the main spray arm 11 rotates under the drive of the water flow, it can synchronously drive the turntable 12 to rotate. A variable pitch spiral rib 1201 is provided on the side of the turntable 12 facing away from the main spray arm 11. The variable pitch spiral rib 1201 is transmission-connected to the second spray arm 2 so that when the turntable 12 is driven to rotate by the main spray arm 11, it can link with the second spray arm 2, thereby causing the second spray arm 2 to rotate.

[0046] The second spray arm 2 includes an auxiliary spray arm 21 and a gear 22. The auxiliary spray arm 21 is arranged on the side of the turntable 12 facing away from the main spray arm 11 and is rotatably connected to the water receiving pipe 32. The auxiliary spray arm 21 is provided with a second flow channel, a second water inlet 2101, and a plurality of second spray holes 2102. The gear 22 is arranged on the auxiliary spray arm 21 and meshes with the variable pitch spiral rib 1201. At this time, the cooperation between the gear 22 and the turntable 12 can be regarded as a cam mechanism. When the main spray arm 11 rotates under the drive of the water flow, it can synchronously drive the rotation of the turntable 12. Since the gear 22 meshes with the variable pitch spiral rib 1201 on the turntable 12, the rotation of the turntable 12 can reliably and synchronously drive the auxiliary spray arm 21 through the gear 22.

[0047] refer to Figure 7-10 , the variable pitch spiral rib 1201 is of uniform pitch at equal angles, and the number of windings of the variable pitch spiral rib 1201 is greater than or equal to 1 circle; the gear 22 has gear teeth 221 uniformly arranged along the circumferential direction, and the distance Q1Q2 between adjacent windings is n times the arc length M1M2 between adjacent gear teeth 221, where n is 1-5, so that the turntable 12 rotates one circle following the main spray arm 11, and the gear 22 rotates n gear teeth. In this embodiment, the number of windings of the variable pitch spiral rib 1201 is greater than 1 circle and less than 2 circles, the gear teeth 221 are straight teeth, and n is 1, so that the distance Q1Q2 is equal to the arc length M1M2. At this time, the main spray arm 11 drives the turntable 12 to rotate one circle, and the auxiliary spray arm 21 and the gear 22 rotate one gear tooth. Special note, refer to Figure 8 , the dotted line P1P2 is a ray on the turntable 12, wherein Q1 and Q2 are the intersection points of the ray and the variable pitch spiral rib 1201, and the distance between Q1Q2 is a specific distance; Figure 10 The circular dotted line L is the pitch circle on the gear 22, where M1 and M2 are the intersection points of the midpoints of two adjacent gear teeth 221 on the pitch circle.

[0048] In this embodiment, the rotation axis of the main spray arm 11 and the rotation axis of the auxiliary spray arm 21 are perpendicular to each other, and the first water inlet 111 is provided in the middle of the top of the first spray arm 1. The turntable 12 is connected and fixed to the top of the first spray arm 11 and is coaxially arranged with the first water inlet 111. The turntable 12 has a circular structure, and a center hole 1203 is provided at the center of the turntable 12 for the vertical passage of the shaft assembly 4. The diameter of the center hole 1203 is larger than the diameter of the first water inlet 111. At least two mounting portions 1202 are provided on the turntable 12. The at least two mounting portions 1202 are circumferentially spaced between the variable pitch spiral rib 1201 and the center hole 1203. The mounting portions 1202 are fixedly connected to the main spray arm 11 via connectors (such as screws), snap-fit structures, or other connecting structures.

[0049] refer to Figure 7-8 The rotating disk 12 includes an inner ring 121, an outer ring 122, and a plurality of connecting ribs 123. The outer ring 122 is disposed outside the inner ring 121. The connecting ribs 123 are circumferentially spaced between the inner and outer rings 121 and 122. The opposite ends of the connecting ribs 123 in the radial direction are fixedly connected to the inner and outer rings 121 and 122, respectively, so that the outer and inner rings 122 are fixedly connected as a whole via the connecting ribs 123. A center hole 1203 is provided at the center of the inner ring 121, and variable-pitch spiral ribs 1201 are provided on the side of the outer ring 122 facing away from the main spray arm 11.

[0050] In this embodiment, the bottoms of the inner ring 121 and the outer ring 122 are flush, the top of the inner ring 121 is higher than the top of the outer ring 122, and the height of the connecting ribs 123 gradually decreases from the inside outward, resulting in a turntable 12 with a high center and low outer edges. Reinforcing ribs 124 connect between adjacent connecting ribs 123, and grille holes 1204 are formed between adjacent connecting ribs 123. This effectively reduces the overall weight of the turntable 12 and helps mitigate its impact on the rotation of the main spray arm 11. Mounting portions 1202 are provided at two of the opposing grille holes 1204. These mounting portions 1202 are integrally formed radially inward with the inner ring. Furthermore, clearances 1205 are provided on the inner ring 121 at locations corresponding to the mounting portions 1202. This provides ample space for mounting the turntable, facilitating the removable connection of the mounting portion 1202 on the turntable 12 to the top of the main spray arm 11 using connectors (e.g., screws).

[0051] The specific structure of the auxiliary spray arm 21 includes but is not limited to any of the following:

[0052] The first one, reference Figure 1-3The auxiliary spray arm 21 includes a first spray arm body 211 having a plurality of second spray holes 2102, a second spray arm body 212 having a plurality of first spray holes 112, and a connecting pipe 213. The connecting pipe 213 connects between the first and second spray arm bodies. A second water inlet 2101 connected to the water receiving pipe 32 is provided at the rear end of the first spray arm body 211. The front end of the first spray arm body 211 is connected to the rear end of the second spray arm body 212 via the connecting pipe 213. The gear 22 is fixedly connected to the outer periphery of the connecting pipe 213. In this embodiment, the first spray arm body 211 and the second spray arm body 212 are respectively threadedly connected to the connecting pipe 213.

[0053] The second type is different from the first type in that the second spray arm body and the connecting pipe are omitted. At this time, the first spray arm body is provided with a second flow channel and multiple second spray holes 2102. The front end of the first spray arm body 211 is closed, and the rear end is provided with a second water inlet. The second water inlet is connected to the water outlet joint of the water receiving pipe 32, and the first spray arm body 211 can rotate relative to the water receiving pipe 32. The gear 22 is fixedly connected to the front end or middle part of the first spray arm body 211.

[0054] refer to Figure 1-3 and Figure 11 Furthermore, the spray system also includes a bowl basket 6, which is arranged at the top of the spray arm mechanism. The main water pipe 31 is connected to the bowl basket 6, and the water receiving pipe 32 and the second spray arm 2 are connected to the bowl basket 6 through the connecting component 5. In this way, the water receiving pipe and the second spray arm are detachably connected to the bottom of the bowl basket 6 through the connecting component 5. At this time, the second spray arm 2 can rotate relative to the connecting component 5.

[0055] In this embodiment, the connecting assembly 5 includes two first connecting blocks 51 and a second connecting block 52. The two first connecting blocks 51 are spaced apart in the front-to-back direction, each of which is positioned outside the auxiliary spray arm 21 of the second spray arm 2 and is snap-connected to the bowl basket 6. The second spray arm 2 can rotate relative to the first connecting block 51. The second connecting block 52 is positioned outside the outlet end of the water receiving pipe 32 and is snap-connected to the bowl basket 6. Furthermore, upwardly opening engaging grooves 513 are recessed on the tops of the first and second connecting blocks 51, 52, which engage with the bottom steel wire 61 of the bowl basket 6.

[0056] refer to Figure 6 and Figure 11The first connecting block 51 is provided with an upwardly opening mounting slot 511. A retaining slot 512 is recessed on the bottom surface of the mounting slot 511 and is connected to the mounting slot 511. The second spray arm 2 is rotatably inserted into the mounting slot 511. An annular rib 2104 is provided on the outer wall of the second spray arm 2 at a position corresponding to the retaining slot 512. The annular rib 2104 is rotatably inserted into the retaining slot 512, thereby limiting the forward and backward positioning of the second spray arm 32. Similarly, an upward-opening mounting groove 511 is provided in the second connecting block 52, and an upward-opening limiting groove 512 connected to the mounting groove 511 is recessed on the bottom surface of the mounting groove 511; the water outlet end of the water receiving pipe 32 is horizontally passed through the mounting groove 511 of the second connecting block, and an annular flange 324 arranged along the circumferential direction is correspondingly protruded on the outer side wall of the water receiving pipe 32. The annular flange 324 is inserted into the limiting groove 512 of the second connecting block 52, so that the front and rear limiting of the water receiving pipe 32 can be achieved.

[0057] Example 2

[0058] refer to Figure 12 This embodiment differs from Example 1 in the number of second spray arms and water connection pipes. In this embodiment, there are two second spray arms 2 and two water connection pipes 32. The two second spray arms 2 are symmetrically positioned on the left and right sides of the main water pipe 31 and are respectively connected to the first spray arm 1. Specifically, the gears 22 on the two second spray arms 2 engage with the variable-pitch spiral ribs 1201 on the rotary disk 12. The rear ends of the two second spray arms 2 are connected to the main water pipe 31 via two water connection pipes 32.

[0059] It can be seen that compared with the spray arm system of Example 1, the spray arm system of this embodiment has richer spraying modes, a larger range, and a better cleaning effect.

[0060] The above descriptions are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A spray system for a dishwasher, characterized in that: The spray arm mechanism comprises: A water pipe assembly (3) comprises a main water pipe (31) and a water connection pipe (32), wherein the water inlet end of the water connection pipe (32) is connected to the main water pipe (31); a first spray arm (1) rotatably connected to the main water pipe (31), the first spray arm (1) being provided with a first water inlet (111) and a plurality of first spray holes (112), the first water inlet (111) being connected to the water outlet end of the main water pipe (31); and The second spray arm (2) is rotatably connected to the first spray arm (1) and the water receiving pipe (32), respectively. The second spray arm (2) is provided with a second water inlet (2101) and a plurality of second spray holes (2102). The second water inlet (2101) is connected to the water outlet end of the water receiving pipe (32).

2. The spray system of a dishwasher according to claim 1, characterized in that: A water outlet (311) extending toward the water receiving pipe (32) is fixedly provided on the main water pipe (31), the water receiving pipe (32) is sleeved outside the water outlet (311) and is detachably connected to the water outlet (311); and / or the second water inlet (2101) is provided at the rear end of the second spray arm (2), a water outlet connector (321) is provided at the water outlet end of the water receiving pipe (32), the water outlet connector (321) is inserted into the second water inlet (2101) and is sealed with the second spray arm (2), and the second spray arm (2) can rotate relative to the water outlet connector (321).

3. The spray system of a dishwasher according to claim 2, characterized in that: A plurality of circumferentially spaced clamping holes (322) are provided on the outer wall of the water inlet end of the water receiving pipe (32); a boss (312) extending outward is fixedly provided at a position on the outer wall of the water outlet (311) corresponding to the clamping holes (322); the boss (312) is inserted into the clamping holes (322); and / or a positioning notch (323) is provided on the water inlet end of the water receiving pipe (32); a positioning rib (313) extending outward is fixedly provided at a position on the outer wall of the water outlet (311) corresponding to the positioning notch (323); the positioning rib (313) is inserted into the positioning notch (323).

4. The spray system of a dishwasher according to claim 1, characterized in that: The second spray arm (2) and the main water pipe (31) are arranged side by side and spaced apart, the rotation axis of the first spray arm (1) and the rotation axis of the second spray arm (2) are perpendicular to each other; and / or the angle between the direction of the first spray hole (112) and the rotation plane of the first spray arm (1) is in the range of 40-90°, and the angle between the direction of the second spray hole (2102) and the rotation plane of the second spray arm (2) is in the range of 0-50°.

5. The spray system of a dishwasher according to claim 1, characterized in that: The first spray arm (1) comprises a main spray arm (11) and a rotating disk (12); the main spray arm (11) is rotatably connected to the main water pipe (31) and is provided with the first water inlet (111) and a plurality of the first spray holes (112); the rotating disk (12) is fixedly connected to the main spray arm (11); and a variable pitch spiral rib (1201) is provided on a side of the rotating disk (12) facing away from the main spray arm (11); The second spray arm (2) comprises an auxiliary spray arm (21) and a gear (22); the auxiliary spray arm (21) is arranged outside the side of the turntable (12) away from the main spray arm (11) and is rotatably connected to the water receiving pipe (32); the auxiliary spray arm (21) is provided with the second water inlet (2101) and a plurality of second spray holes (2102); the gear (22) is arranged on the auxiliary spray arm (21) and is engaged with the variable pitch spiral rib (1201).

6. The spray system of a dishwasher according to claim 5, characterized in that: The number of winding turns of the variable pitch spiral rib (1201) is greater than or equal to 1 turn; the gear (22) has gear teeth (221) evenly arranged in a circumferential direction, and the distance between adjacent winding turns is n times the arc length between adjacent gear teeth (221).

7. The spray system of a dishwasher according to claim 5, characterized in that: The turntable (12) is coaxially arranged with the first water inlet (111), and at least two mounting portions (1202) are provided on the turntable (12). The at least two mounting portions (1202) are circumferentially spaced apart and arranged radially inwardly of the variable-pitch spiral rib (1201) and are fixedly connected to the main spray arm (11).

8. The spray system of a dishwasher according to claim 7, characterized in that: The turntable (12) includes an inner ring (121), an outer ring (122) and a plurality of connecting ribs (123), wherein the outer ring (122) is arranged on the periphery of the inner ring (121), and the plurality of connecting ribs (123) are circumferentially spaced between the inner ring (121) and the outer ring (122), and opposite ends of the connecting ribs (123) in the radial direction are fixedly connected to the inner ring (121) and the outer ring (122), respectively, and a variable pitch spiral rib (1201) is provided on a side of the outer ring (122) away from the main spray arm (11).

9. The spray system of a dishwasher according to claim 5, characterized in that: The auxiliary spray arm (21) comprises a first spray arm body (211) having a plurality of the second spray holes (2102); the rear end of the first spray arm body (211) is connected to the water receiving pipe (32), and the first spray arm body (211) is rotatable relative to the water receiving pipe (32); and the gear (22) is arranged at the front end or the middle part of the first spray arm body (211).

10. The spray system of a dishwasher according to claim 9, characterized in that: The auxiliary spray arm (21) further comprises a second spray arm body (212) having a plurality of second spray holes (2102) and a connecting pipe (213); the front end of the first spray arm body (211) is connected to the rear end of the second spray arm body (212) via the connecting pipe (213); and the gear (22) is arranged on the periphery of the connecting pipe (213).

11. The spray system of a dishwasher according to claim 1, characterized in that: The invention also comprises a bowl basket (6), wherein the bowl basket (6) is arranged on the top of the spray arm mechanism, the main water pipe (31) is connected to the bowl basket (6), the water receiving pipe (32) and the second spray arm (2) are connected to the bowl basket (6) via a connecting assembly (5), and the second spray arm (2) can rotate relative to the connecting assembly (5).

12. The spray system of a dishwasher according to claim 11, characterized in that: The connecting assembly (5) comprises at least one first connecting block (51) and a second connecting block (52), wherein the first connecting block (51) is clamped outside the second spray arm (2) and connected to the bowl basket (6), and the second connecting block (52) is clamped outside the water receiving pipe (32) and connected to the bowl basket (6).

13. The spray system of a dishwasher according to claim 12, characterized in that: The first connecting block (51) is provided with a mounting groove (511), and a limiting groove (512) is recessed on the bottom surface of the mounting groove (511) and is open upward and communicated with the mounting groove (511); the second spray arm (2) is rotatably inserted into the mounting groove (511), and an annular convex rib (2104) is convexly provided at a position of the outer side wall of the second spray arm (2) corresponding to the limiting groove (512), and the annular convex rib (2104) is rotatably inserted into the limiting groove (512).

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