CN216554603U - Volute structure, water flow system and cleaning machine - Google Patents

Abstract

The utility model relates to a volute structure, a water flow system and a cleaning machine, wherein the volute structure comprises a lower shell, a second accommodating cavity for installing the lower part of a first power component is formed in the upper part of the lower shell, a first water inlet for supplying water into the second accommodating cavity is formed in the side part of the lower shell, a third accommodating cavity for installing the second power component is formed in the lower part of the lower shell, a second water inlet for supplying water into the third accommodating cavity is formed in the bottom of the lower shell, and a first output pipe and a second output pipe for supplying water to be output from the third accommodating cavity are connected to the side part of the lower shell. The utility model provides a volute structure of an open water pump, wherein the power of two paths of water flows is independently supplied by corresponding pumps, so that the lift and the water flow of each path of water flow are improved, and the cleaning effect is favorably improved; the outlet of the lower shell is provided with a first output pipe and a second output pipe which are relatively independent, water is supplied to the top and the middle of the lower shell respectively, a shunt valve is not required to be arranged independently, the integral structure is simplified, and the cost is reduced.

Description

Volute structure, water flow system and cleaning machine

Technical Field

The utility model relates to the technical field of dish washing machines, in particular to a volute structure, a water flow system and a cleaning machine.

Background

For table type and cabinet type dish washing machines, because the washing space is large, in order to achieve better washing effect, a top spray arm, a middle spray arm and a lower spray arm are generally designed; when the dishwasher is in operation, the washing pump conveys water to the top, the middle and the lower spray arms through pipelines, the water is sprayed out of the top, the middle spray arms and the lower spray arms and washes tableware and then falls back into a water cup at the bottom of the dishwasher, and the washing pump conveys the fallen water to the top, the middle and the lower spray arms again to complete a cycle.

For example, the chinese utility model patent application publication No. CN106859563A, energy saving dishwasher (application No. CN201611232345.5), discloses a structure including a chamber for accommodating tableware and providing a cleaning space, a spray system for spraying water to clean the tableware, and a pump body for pumping water and supplying water to the spray system; the spraying system is arranged in the cavity; the water pumping end of the pump body is communicated with the cavity, and the water supply end is communicated with the spraying system; the spraying system comprises an inner water pipe and more than two sets of spraying devices, and the more than two sets of spraying devices are respectively arranged on the inner water pipe; the water supply end of the pump body is connected with a water distribution device, the water distribution device is provided with more than two water outlets corresponding to more than two sets of spraying devices, and the spraying devices are communicated with the corresponding water outlets; when the spraying device works, the water distribution device conducts more than one water outlet according to the instruction, so that more than one set of spraying device can perform cleaning work.

In the above-mentioned current dish washer that can carry out bottom and spray, top sprays, a pump for supplying water for the spraying system generally adopts closed structure, is about to locate the spiral case of washing pump in the box below, is provided with ability pivoted impeller in the spiral case, and the water inlet of washing pump spiral case is linked together bottom the washing chamber, and the delivery port of spiral case is connected with the water diversion device, and this water diversion device divides into the first branch road of supplying water to bottom spray arm and the second branch road of supplying water to top spray arm with rivers. Because the water pressure of the top spraying water and the water pressure of the bottom spraying water are independently supplied by the washing pump, the lift, the flow and the impact force of the water flow on each branch are greatly reduced after the water flow is divided, and the cleaning effect is influenced; meanwhile, the closed volute fixed below the box body is difficult to disassemble, assemble and clean, bacteria can be bred due to residue accumulation after long-time use, washing effect is influenced, and poor experience can be brought to users.

In addition, the volute structure directly influences the water supply capacity of the pump, and the volute in the prior art is mature, and the water flow lift and flow cannot be improved under the condition that the volute structure is not changed.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is to provide a volute structure which is beneficial to improving the lift and the water flow of water flow and further improving the cleaning effect aiming at the current situation of the prior art.

The second technical problem to be solved by the present invention is to provide a water flow system using the above volute structure, which provides power for two paths of washing water separately, so as to improve the lift and water flow rate and further improve the cleaning effect.

The third technical problem to be solved by the present invention is to provide a cleaning machine having the above water flow system, in view of the current state of the prior art.

The technical scheme adopted by the utility model for solving at least one technical problem is as follows:

the utility model provides a volute structure, includes lower casing, the upper portion of casing has the second holding chamber that is arranged in installing first power component lower part down, the lateral part of casing is opened down has the first water inlet that supplies water and get into in the second holding chamber, the lower part of casing has the third holding chamber that is used for installing second power component down, open the bottom of casing down has the second water inlet that supplies water and get into in the third holding chamber, the lateral part of casing is connected with first output tube, the second output tube of supplying water from third holding chamber output down.

Preferably, the lateral part of the lower shell is tangentially connected with a water guide pipeline for supplying water to be output from the third accommodating cavity, and the first output pipe and the second output pipe are respectively connected to the output end of the water guide pipeline. The structure is beneficial to reducing the capacity loss of the water flow so as to keep the larger lift and pressure of the water flow.

Preferably, the inner diameter of the output end of the water guide pipeline gradually shrinks along the water flow direction to form a first flow guide structure with smooth transition, a V-shaped second flow guide structure is formed at the joint of the first output pipe and the second output pipe, and the tip of the V-shaped structure is arranged towards the middle of the water guide pipeline corresponding to the water supply direction. First water conservancy diversion structure leads, pressurizes the delivery stream of water conservancy diversion pipeline earlier, and the second water conservancy diversion structure of rethread V-arrangement shunts fast and gets into in first output tube, the second output tube, and above-mentioned water conservancy diversion structure is favorable to reducing energy loss and carrying out certain pressure boost to rivers when the reposition of redundant personnel, improves the lift of jet stream.

Preferably, the first outlet pipe is formed in an S-shaped structure substantially corresponding to the direction of the water flow in the water guide duct, and the second outlet pipe is formed in a Z-shaped structure capable of guiding the water flow in the water guide duct sideways. The direction of the outlet end of the S-shaped structure and the direction of the outlet end of the Z-shaped structure are consistent with the flowing direction of water flow in the water guide pipeline. On the one hand, the structure is used for adapting to water supply pipeline structures at different positions, and on the other hand, the energy loss is reduced as much as possible.

The volute structure further comprises an upper shell arranged on the lower shell, the upper shell is provided with a first accommodating cavity used for installing the upper part of the first power component, and the top wall and/or the side wall of the upper shell are/is provided with spray holes communicated with the first accommodating cavity in a fluid mode. The upper shell forms a bottom spraying arm structure of the cleaning machine, so that the volute forms an open volute and is convenient to mount and clean.

In the above scheme, the middle part of the lower shell is provided with a partition plate for dividing the second accommodating cavity and the third accommodating cavity into relatively independent cavities, and the third accommodating cavity is located below the partition plate and is approximately disc-shaped. The second accommodating cavity and the third accommodating cavity are relatively independent, so that water supply for downward spraying and top and/or middle spraying is facilitated, mutual fluid disturbance is reduced, the problem of water robbing caused by suction distribution is avoided, capacity loss is reduced, and water flow lift, water flow and spraying strength are improved.

Preferably, the second accommodating cavity is located above the partition plate and extends vertically, and the inner diameter of the second accommodating cavity is smaller than that of the third accommodating cavity and is matched with the lower part of the first power component. The structure is beneficial to reducing the capacity loss of water flow when the water flow passes through the second accommodating cavity.

Preferably, the top wall of the partition board is provided with a n-shaped coaming board extending transversely, the coaming board and the partition board jointly enclose a water inlet channel communicated with the second accommodating cavity, and an outer port of the water inlet channel forms the first water inlet. By adopting the structure, the water inlet channel is convenient to produce and manufacture, and is arranged at the bottom of the second accommodating cavity, so that the water flow disturbance is favorably reduced, and the capacity loss of the water flow flowing through the second accommodating cavity is further reduced.

For the convenience of assembly, the outer circumferential wall of the upper portion of the lower housing is provided with a support plate extending in a radial direction, and the upper housing is restrained on the support plate. The upper wall surface of the supporting plate is provided with a clamping ring, and the bottom wall of the upper shell is provided with a clamping pin which can rotatably penetrate through the clamping ring to be arranged and is clamped and limited with the bottom wall of the clamping ring, so that the upper shell is detachably connected to the top of the lower shell.

A water flow system using the volute structure, comprising:

the volute structure;

the upper part of the upper impeller is rotatably arranged in the first accommodating cavity and is used for dispersing water in the first accommodating cavity and spraying the water out of the spray hole; the lower part of the upper impeller is rotatably arranged in the second accommodating cavity and is used for pumping water into the second accommodating cavity through the first water inlet and conveying the water to the first accommodating cavity;

the lower impeller is rotatably arranged in the third accommodating cavity and is used for pumping water into the third accommodating cavity through the second water inlet and outputting the water through the water outlet;

and the driving part is arranged below the volute, and a power output shaft of the driving part extends upwards and is connected with the upper impeller and the lower impeller.

The utility model provides an use cleaning machine that has above-mentioned rivers system, includes the box and can be with the water supply pipe of the water of bottom half to the upper transport, first lateral conduit, second lateral conduit that have relatively independent among the water supply pipe, first lateral conduit is used for carrying rivers to the box top, second lateral conduit is used for carrying rivers to the box middle part, down the casing restraint on the internal diapire of box and first output tube is connected with first lateral conduit, the second output tube is connected with second lateral conduit.

Preferably, the box body is provided with a first water guide cavity and a second water guide cavity which are relatively independent, a first water inlet opening connected with the output end of the first output pipe is formed in the side portion of the first water guide cavity, a first water outlet opening connected with the input end of the first branch pipeline is formed in the top portion of the first water guide cavity, a second water inlet opening connected with the output end of the second output pipe is formed in the side portion of the second water guide cavity, and a second water outlet opening connected with the input end of the second branch pipeline is formed in the top portion of the second water guide cavity. By adopting the structure, a shunt valve does not need to be arranged independently, the structure of the cleaning machine is simplified, and the production cost is reduced.

Compared with the prior art, the utility model has the advantages that: the utility model provides a volute structure of an open water pump, wherein a second accommodating cavity positioned at the upper part supplies water for spraying at the bottom, a third accommodating cavity positioned at the lower part supplies water for spraying at the top and/or the middle part, and because the power of two paths of water flows is independently supplied by corresponding pumps, the lift and the water flow of each path of water flow are improved, and the cleaning effect is favorably improved; and the outlet of the lower shell is provided with a first output pipe and a second output pipe which are relatively independent, so that water is supplied to the top and the middle of the lower shell respectively, a shunt valve is not required to be arranged independently, the integral structure is simplified, and the cost is reduced.

Drawings

FIG. 1 is a schematic diagram of a cleaning machine according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the construction of a water flow system in an embodiment of the present invention;

FIG. 3 is a cross-sectional view of FIG. 2;

FIG. 4 is a schematic structural diagram of a lower housing according to an embodiment of the present invention;

FIG. 5 is a schematic view of the lower housing at another angle according to the embodiment of the present invention;

FIG. 6 is a cross-sectional view of the lower housing in an embodiment of the present invention;

FIG. 7 is another cross-sectional view of the lower housing in an embodiment of the present invention;

FIG. 8 is an exploded view of the housing, water supply pipe and lower housing in accordance with an embodiment of the present invention.

Detailed Description

The utility model is described in further detail below with reference to the accompanying examples.

The volute structure of the water pump of this embodiment is applicable to the double pump system, can provide the pump system of two-way power, and the double pump system can be applied to in the great dish washer of volume, sprays for the bottom, sprays and/or the middle part sprays the water supply, certainly also is not limited to this service environment.

As shown in fig. 1 to 8, the volute structure of the present embodiment includes an upper casing 3 and a lower casing 4, the upper casing 3 has a body extending in a length direction, a first accommodating cavity 31 is formed in a central portion of the body for installing an upper portion of a first power component, two sides of the body respectively have a flow channel communicated with the first accommodating cavity 31, and a nozzle hole 32 communicated with the flow channel is formed in a top wall of the upper casing 3. The lower shell 4 is connected below the upper shell 3, the upper part of the lower shell 4 is provided with a second accommodating cavity 41 for installing the lower part of the first power component, the second accommodating cavity 41 is correspondingly communicated with the first accommodating cavity 31, and the side part of the lower shell 4 is provided with a first water inlet 411 for water to enter the second accommodating cavity 41; the lower part of the lower shell 4 is provided with a third accommodating cavity 42 for installing a second power component, the bottom of the lower shell 4 is provided with a second water inlet 421 for supplying water into the third accommodating cavity 42, and the side part of the lower shell 4 is connected with a first output pipe 401 and a second output pipe 402 for supplying water from the third accommodating cavity 42.

Specifically, as shown in fig. 4 to 7, a water conduit 423 for supplying water to the third accommodating chamber 42 is tangentially connected to a side of the lower housing 4, and the first output pipe 401 and the second output pipe 402 are respectively connected to an output end of the water conduit 423. As shown in fig. 6, the inner diameter of the water conduit 423 gradually shrinks along the water flow direction at the output end to form a first flow guiding structure 403 with smooth transition, a V-shaped second flow guiding structure 404 is formed at the junction of the first output pipe 401 and the second output pipe 402, and the tip of the V-shaped structure is arranged towards the middle of the water conduit 423 corresponding to the water flow direction. The first diversion structure 403 guides and pressurizes the output water flow of the water guide pipeline 423, and then the water flow is quickly diverted through the V-shaped second diversion structure 404 to enter the first output pipe 401 and the second output pipe 402.

The first outlet pipe 401 is formed in an S-shaped configuration substantially corresponding to the direction of the water flow in the water guide channel 423, and the second outlet pipe 402 is formed in a Z-shaped configuration capable of guiding the water flow in the water guide channel 423 to the side. The orientations of the outlet end of the S-shaped structure and the outlet end of the Z-shaped structure are consistent with the flowing direction of water flow in the water guide pipeline 423. On the one hand, the structure is used for adapting to water supply pipeline structures at different positions, and on the other hand, the energy loss is reduced as much as possible.

In this embodiment, as shown in fig. 4 to 6, a partition plate 43 for dividing the second accommodating chamber 41 and the third accommodating chamber 42 into relatively independent chambers is disposed in the middle of the lower housing 4, and the third accommodating chamber 42 is located below the partition plate 43 and is substantially disc-shaped. The second accommodating cavity 41 and the third accommodating cavity 42 are relatively independent, so that independent water supply for bottom spraying, top spraying and/or middle spraying is facilitated, mutual fluid disturbance is reduced, capacity loss is reduced, and water flow lift, water flow and jet force are improved.

The second accommodating chamber 41 is located above the partition 43 and extends vertically, and the inner diameter of the second accommodating chamber 41 is smaller than the inner diameter of the third accommodating chamber 42 and is adapted to the lower portion of the first power component. This configuration is advantageous in reducing the loss of water flow through the second receiving chamber 41.

As shown in fig. 4, 5 and 6, the top wall of the partition 43 is provided with a n-shaped skirt 431 extending transversely, the skirt 431 and the partition 43 together define a water inlet passage 432 communicating with the second receiving chamber 41, and an outer port of the water inlet passage 432 forms the first water inlet 411. By adopting the structure, the production and the manufacture are convenient, and the water inlet channel 432 is arranged at the bottom of the second accommodating cavity 41, so that the disturbance of water flow is reduced, and the capacity loss of the water flow flowing through the second accommodating cavity 42 is further reduced.

For ease of assembly, the outer peripheral wall of the upper portion of the lower case 4 is provided with a support plate 44 extending in the radial direction, and the upper case 3 is restrained on the support plate 44. A clamping ring 441 is arranged on the upper wall surface of the supporting plate 44, and a clamping pin 33 which can be rotatably arranged through the clamping ring 441 and is clamped and limited with the bottom wall of the clamping ring 441 is arranged on the bottom wall of the upper shell 3, so that the upper shell 3 is detachably connected to the top of the lower shell 4.

The water flow system using the volute structure in this embodiment includes the volute structure, an upper impeller 1, a lower impeller 2, and a driving member 5, where the upper impeller 1 has a first shaft 11 located at the center and a plurality of first blades 12 distributed at intervals along the circumferential direction on the circumferential surface of the first shaft 11 and extending along the axial direction, the upper portion of each first blade 12 is a centrifugal blade, and the lower portion thereof is an axial flow blade. The lower impeller 2 includes a second shaft 21 located at the center and a plurality of second blades 22 circumferentially spaced apart from each other on the circumferential surface of the second shaft 21, and the second blades 22 are centrifugal blades. The upper part of the upper impeller 1 is rotatably arranged in the first accommodating cavity 31 and is used for dispersing water in the first accommodating cavity 31 and spraying the water out of the spraying hole 32; the lower portion of the upper impeller 1 is rotatably disposed in the second receiving chamber 41, and is used for drawing water into the second receiving chamber 41 through the first water inlet 411 and conveying the water to the first receiving chamber 31. The lower impeller 2 is rotatably disposed in the third accommodating chamber 42, and is used for drawing water into the third accommodating chamber 42 through the second water inlet 421 and outputting the water through the first output pipe 401 and the second output pipe 402. The driving part 5 is a motor, and the output shaft vertically extends and is connected with the upper impeller 1 and the lower impeller 2, and is used for driving the upper impeller 1 and the lower impeller 2 to rotate.

The cleaning machine with the water flow system comprises a box body 6 and a water supply pipeline 7 capable of conveying water at the bottom of the box body 6 upwards, wherein the water supply pipeline 7 is provided with a first branch pipeline 71 and a second branch pipeline 72 which are relatively independent, the first branch pipeline 71 is used for conveying water flow to the top of the box body 6, the second branch pipeline 72 is used for conveying water flow to the middle of the box body 6, the lower shell 4 is constrained on the inner bottom wall of the box body 6 through screws or buckles, the first output pipe 401 is connected with the first branch pipeline 71, and the second output pipe 402 is connected with the second branch pipeline 72.

As shown in fig. 8, the box body 6 is provided with a first water guide chamber 601 and a second water guide chamber 602 which are relatively independent, a first water inlet opening 611 connected with the output end of the first output pipe 401 is formed on the side portion of the first water guide chamber 601, a first water outlet opening 612 connected with the input end of the first branch pipe 71 is formed on the top portion of the first water guide chamber 601, a second water inlet opening 621 connected with the output end of the second output pipe 402 is formed on the side portion of the second water guide chamber 602, and a second water outlet opening 622 connected with the input end of the second branch pipe 72 is formed on the top portion of the second water guide chamber 602. By adopting the structure, a shunt valve does not need to be arranged independently, the structure of the cleaning machine is simplified, and the production cost is reduced.

When the water pump is used, the output shaft of the driving part 5 rotates to drive the upper impeller 1 and the lower impeller 2 to rotate, the axial flow blades at the lower part of the first blades 12 suck water into the second accommodating cavity 41 from the first water inlet 411 and convey the water upwards into the first accommodating cavity 31, and the water in the first accommodating cavity 31 is sprayed out through the spray holes 32 under the action of the upper part of the first blades 12; the second blade 22 sucks water from the second water inlet 421 into the third accommodating cavity 42, and after the water is output along the water conduit 423 in the circumferential direction, the water is conveyed to the top of the box 6 through the first output pipe 401 and the first branch pipeline 71 for spraying, and is used for conveying the water to the middle of the box 6 through the second output pipe 402 and the second branch pipeline 72 for spraying.

Directional terms such as "front," "rear," "upper," "lower," "left," "right," "side," "top," "bottom," and the like are used in the description and claims of the present invention to describe various example structural portions and elements of the utility model, but are used herein for convenience of description only and are to be determined based on the example orientations shown in the drawings. Because the disclosed embodiments of the present invention may be oriented in different directions, the directional terms are used for descriptive purposes and are not to be construed as limiting, e.g., "upper" and "lower" are not necessarily limited to directions opposite to or coincident with the direction of gravity.

Claims (14)

1. A volute structure, comprising: including lower casing (4), the upper portion of lower casing (4) has second holding chamber (41) that is arranged in installing first power component lower part, the lateral part of lower casing (4) is opened has first water inlet (411) that supplies water and get into in second holding chamber (41), the lower part of lower casing (4) has third holding chamber (42) that are used for installing second power component, open the bottom of lower casing (4) has second water inlet (421) that supplies water and get into third holding chamber (42), the lateral part of lower casing (4) is connected with first output tube (401), second output tube (402) that supply water from third holding chamber (42) output.

2. The volute structure of claim 1, wherein: the lateral part of lower casing (4) tangential connection have supply water pipe (423) of leading of third holding chamber (42) output, first output tube (401), second output tube (402) connect respectively in the output department of leading water pipe (423).

3. The volute structure of claim 2, wherein: the inner diameter of the output end of the water guide pipeline (423) is gradually contracted along the water flow direction to form a first flow guide structure (403) in smooth transition, a V-shaped second flow guide structure (404) is formed at the joint of the first output pipe (401) and the second output pipe (402), and the tip of the V-shaped structure is arranged towards the middle part of the water guide pipeline (423) corresponding to the water supply direction.

4. The volute structure of claim 2, wherein: the first output pipe (401) is shaped into an S-shaped structure which is basically consistent with the water flow direction in the water guide pipe (423), and the second output pipe (402) is shaped into a Z-shaped structure which can guide the water flow in the water guide pipe (423) to the side.

5. The volute structure of claim 4, wherein: the direction of the outlet end of the S-shaped structure and the direction of the outlet end of the Z-shaped structure are consistent with the flowing direction of water flow in the water guide pipeline (423).

6. The volute structure of any of claims 1 to 5, wherein: the power device is characterized by further comprising an upper shell (3) arranged on the lower shell (4), the upper shell (3) is provided with a first accommodating cavity (31) used for installing the upper portion of the first power component, and the top wall and/or the side wall of the upper shell (3) are/is provided with spray holes (32) communicated with the first accommodating cavity (31) in a fluid mode.

7. The volute structure of claim 6, wherein: the middle part of the lower shell (4) is provided with a partition plate (43) used for dividing the second accommodating cavity (41) and the third accommodating cavity (42) into relatively independent cavities, and the third accommodating cavity (42) is located below the partition plate (43) and approximately disc-shaped.

8. The volute structure of claim 7, wherein: the second accommodating cavity (41) is located above the partition plate (43) and extends vertically, and the inner diameter of the second accommodating cavity (41) is smaller than that of the third accommodating cavity (42) and is matched with the lower portion of the first power component.

9. The volute structure of claim 8, wherein: the n-shaped coaming (431) transversely extending is arranged on the top wall of the partition plate (43), a water inlet channel (432) communicated with the second accommodating cavity (41) is formed by the coaming (431) and the partition plate (43) in a surrounding mode, and the outer port of the water inlet channel (432) forms the first water inlet (411).

10. The volute structure of claim 6, wherein: the outer peripheral wall of the upper portion of the lower casing (4) is provided with a support plate (44) extending in the radial direction, and the upper casing (3) is restrained on the support plate (44).

11. The volute structure of claim 10, wherein: be provided with rand (441) on the upper wall of backup pad (44), be provided with on the diapire of last casing (3) and pass rand (441) with rotating and arrange and with rand (441) diapire looks joint spacing card foot (33).

12. A water flow system using the volute structure of any one of claims 6 to 11, wherein: comprises that

The volute structure;

the upper part of the upper impeller (1) is rotatably arranged in the first accommodating cavity (31) and is used for dispersing water in the first accommodating cavity (31) and spraying the water out of the spray hole (32); the lower part of the upper impeller (1) is rotatably arranged in the second accommodating cavity (41) and is used for drawing water into the second accommodating cavity (41) through the first water inlet (411) and conveying the water to the first accommodating cavity (31);

the lower impeller (2) is rotatably arranged in the third accommodating cavity (42) and is used for pumping water into the third accommodating cavity (42) through the second water inlet (421) and outputting the water through the water outlet (422);

and the driving part (5) is arranged below the volute, and a power output shaft of the driving part (5) extends upwards and is connected with the upper impeller (1) and the lower impeller (2).

13. A cleaning machine using the water flow system of claim 12, wherein: including box (6) and can be with water supply pipe (7) of the water of box (6) bottom upwards transport, its characterized in that: have relatively independent first branch pipeline (71), second branch pipeline (72) in water supply pipeline (7), first branch pipeline (71) are used for carrying the rivers to box (6) top, second branch pipeline (72) are used for carrying the rivers to box (6) middle part, casing (4) restraint is connected with second branch pipeline (72) on box (6) interior diapire and first output tube (401) are connected with first branch pipeline (71), second output tube (402) are connected with second branch pipeline (72).

14. The cleaning machine of claim 13, wherein: the box body (6) is provided with a first water guide cavity and a second water guide cavity which are relatively independent, a first water inlet opening connected with the output end of the first output pipe (401) is formed in the side portion of the first water guide cavity, a first water outlet opening connected with the input end of the first branch pipeline is formed in the top portion of the first water guide cavity, a second water inlet opening connected with the output end of the second output pipe (402) is formed in the side portion of the second water guide cavity, and a second water outlet opening connected with the input end of the second branch pipeline is formed in the top portion of the second water guide cavity.

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