CN214945226U - Impeller structure, double-pump system and cleaning machine - Google Patents

Abstract

The utility model relates to an impeller structure and use thereof, impeller structure have the axle that is located the center and a plurality of blades along circumference interval distribution on the periphery wall of axle, still are provided with the apron that is located the blade top on the periphery wall of axle, and the diameter of apron is less than the diameter of blade. The impeller structure is used in a closed volute of a double-pump system to provide power for upper-layer spraying water, so that the lift and water flow of the upper-layer spraying water can be improved; in the open type double-pump system of the utility model, the second holding cavity, the first holding cavity and the upper impeller which are positioned at the upper part supply water for bottom spraying, and the third holding cavity and the impeller structure which are positioned at the lower part supply water for top and/or middle spraying, because the power of two paths of water flow is independently supplied by the corresponding pump, the lift and the water flow of each path of water flow are improved, which is beneficial to improving the cleaning effect; the utility model discloses a dismouting of being convenient for of double pump system will go up the casing and pull down on the casing down, can wash last casing, last impeller and casing down, avoids bacterial growing.

Description

Impeller structure, double-pump system and cleaning machine

Technical Field

The utility model relates to a dish washer technical field specifically indicates an impeller structure and applied double pump system, the cleaning machine that has this impeller structure.

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 structure of the impeller in the volute directly determines the water supply capacity of the pump, and the impeller in the prior art is mature, so that the water flow lift and flow can not be improved under the condition that the structure of the volute is not changed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the first technical problem to provide a be favorable to improving the lift and the discharge of rivers and then improve cleaning performance's impeller structure to prior art's current situation.

The utility model aims to solve the second technical problem to provide a double pump system who uses above-mentioned impeller structure to current situation to prior art, thereby this double pump system improves lift and discharge and then improves the cleaning performance through providing power for two way washing water alone respectively.

The utility model discloses the third technical problem that will solve is to prior art's current situation, thereby provides one kind and adopts open spiral case to be convenient for carry out dismouting and abluent double pump system.

The utility model discloses the fourth technical problem that will solve is to prior art's current situation, provides a should have the cleaning machine of above-mentioned double pump system.

The utility model provides a technical scheme that at least one above-mentioned technical problem adopted does: the impeller structure is provided with a shaft positioned at the center and a plurality of blades which are distributed on the peripheral wall of the shaft at intervals along the circumferential direction, a cover plate positioned at the top of each blade is further arranged on the peripheral wall of the shaft, the lower wall surface of the cover plate is in smooth transition connection with the blades, and the diameter of the cover plate is smaller than that of the blades.

Preferably, the peripheral wall of the shaft below the cover plate at least partially extends outwards from bottom to top gradually along the radial direction to form a cambered surface, and the upper end of the cambered surface is smoothly connected with the lower wall surface of the cover plate. After the double-pump system is assembled, the cambered surface is arranged corresponding to the water inlet, so that the water inlet can be rapidly dispersed along the circumferential direction, and the energy loss in the dispersing process is reduced.

In the utility model discloses, the circular arc radius of cambered surface is R1, blade height is H, R1H ═ (0.8 ~ 1.8): 1. The height of each blade is 8.5-9.5 mm, and the arc radius of the cambered surface is 10-15 mm. The diameter of the blade is D, the diameter of the cover plate is D, and D is (0.4-0.85) D. The diameter of the blade is 45-58 mm, and the diameter of the cover plate is 28-42 mm. Because the utility model discloses an impeller structure is arranged in spraying and/or the middle part rivers that spray provide power to top in the dish washer, and this way water discharge and the lift are directly decided to impeller structure's parameter, adopt above-mentioned parameter, through the service environment that experiment verification, numerical simulation and combination box dish washer, have obtained the effect of ideal, make the upper strata spray and have higher clean effect.

Preferably, the blade includes a first portion arranged corresponding to the cover plate and extending in a radial direction of the shaft, and a second portion located outside the cover plate and extending outward from an edge of the cover plate in a rotational direction of the shaft. Further preferably, the length of the first portion is L1, the length of the second portion is L2, and L2 is K (L1+ L2), and K is 0.4 to 0.5 in a plan view. The acute angle formed between the first part and the second part is

By adopting the structure, the water spraying device is beneficial to improving the work done on water, thereby improving the lift and water flow of the upper-layer spraying water.

Preferably, the number of the blades is 6-10, and more preferably 8. When the number of the blades is less, less work is done on the fluid in unit time, and the lift and the flow of a pump in the dish washing machine are not up to the standard; however, when the number of the blades reaches a certain number, the lifting of the lift and the flow rate is limited by continuously increasing the number of the blades, and the lift and the flow rate are reduced due to the increase of the occupied space of the impeller flow channel caused by the increase of the blades.

A double-pump system applying the impeller structure comprises

The upper impeller is provided with a first shaft positioned in the center and first blades which are distributed on the circumferential surface of the first shaft at intervals along the circumferential direction and extend along the axial direction;

the impeller structure;

the upper shell is provided with a first accommodating cavity for installing the upper part of the first blade, 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; and

the lower casing, connect in the below of last casing, the upper portion of casing has the second holding chamber that is used for installing first blade lower part down, it has the first water inlet that supplies water to get into in the second holding chamber to open on the lateral wall of casing down, the lower part of casing has the third holding chamber that is used for installing the impeller structure down, it has the second water inlet that supplies water to get into in the third holding chamber and the delivery port of export from the third holding chamber to open on the lateral wall of casing and/or the diapire down.

In the above scheme, the middle part of the lower shell is provided with a partition board for dividing the second accommodating cavity and the third accommodating cavity into relatively independent cavities. The second containing cavity and the third containing cavity are relatively independent, so that water supply for lower spraying through the upper impeller and water supply for top and/or middle spraying through the impeller structure are facilitated, mutual fluid disturbance is reduced, capacity loss is reduced, and water flow lift, water flow and jet force are improved.

Preferably, the third accommodating cavity is located below the partition plate and is approximately disc-shaped, the second water inlet is formed in the bottom wall of the lower shell, and the water outlet is formed in the side wall of the lower shell and is tangentially connected with the third accommodating cavity through a guide pipeline. The structure is beneficial to reducing the capacity loss of the third accommodating cavity for outputting water flow.

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 blade. 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.

Preferably, a third water inlet arranged corresponding to the first accommodating cavity is formed in the bottom wall of the upper shell, and the third water inlet is butted with an upper port of the second accommodating cavity. The diameter of the third water inlet is larger than the inner diameter of the second accommodating cavity, and the inner diameter of the upper part of the lower shell close to the upper end of the second accommodating cavity is gradually enlarged to form a guide part which can be smoothly transited and connected with the inner bottom wall of the first accommodating cavity. The structure is beneficial to reducing the capacity loss of water flow in the process of entering the first accommodating cavity from the second accommodating cavity.

Preferably, the outer edge of the guide portion is arranged close to the inner edge of the third water inlet, a blocking piece which extends along the radial direction and is supported on the bottom wall of the upper shell is arranged on the outer peripheral wall of the guide portion, and the outer edge of the blocking piece is arranged corresponding to the inner edge of the blocking foot. The structure is favorable for improving the sealing performance of the third water inlet, and avoids water leakage from influencing the bottom spraying lift.

In the utility model, the upper part of the first blade is a centrifugal blade, and the lower part is an axial flow blade; the second water inlet is arranged on the bottom wall of the lower shell, and the smooth transition position between the lower wall surface of the cover plate and the blades in the impeller structure corresponds to the second water inlet.

In each of the above schemes, the dual-pump system further includes a driving member for driving the upper impeller and the impeller structure to rotate, the driving member is disposed below the lower casing, the output shaft is disposed upward, and the output shaft penetrates through the lower casing from bottom to top and extends into the first accommodating cavity of the upper casing and is connected with the impeller structure and the upper impeller respectively. By adopting the structure, a double-pump system is constructed by adopting one power source, and the water supply condition is more conveniently controlled on the basis of simplifying the whole structure and reducing the production cost.

Preferably, the output shaft is respectively limited with the upper impeller and the impeller structure in the radial direction, and a nut capable of preventing the upper impeller from moving along the axial direction of the output shaft is arranged at the upper end of the output shaft. By adopting the structure, the upper shell is convenient to disassemble and assemble, the upper impeller can be taken down after the upper shell is taken down from the clamping ring, and the cavity on the upper part of the upper shell, the upper impeller and the lower shell is cleaned, so that bacteria breeding is avoided, and the cleaning effect is improved.

The utility model provides an use cleaning machine that has above-mentioned double pump system, includes the box and can be with the water supply pipe that the water of bottom half upwards carried, its characterized in that: the lower shell is restrained on the inner bottom wall of the box body, and the water outlet is connected with the lower end of the water supply pipeline.

Preferably, the water supply pipeline is provided with a first branch pipeline and a second branch pipeline which are relatively independent, the first branch pipeline is used for conveying water flow to the middle of the box body, and the second branch pipeline is used for conveying water flow to the top of the box body. By adopting the structure, the spraying of the lower layer, the middle layer and the top layer is realized, and the cleaning effect is favorably improved.

Preferably, the bottom of the box body is further provided with a shunt valve for controlling whether the first branch pipeline and the second branch pipeline circulate or not, a water inlet of the shunt valve is connected with a water outlet of the lower shell, a first water outlet of the shunt valve is connected with an input end of the first branch pipeline, and a second water outlet of the shunt valve is connected with an input end of the second branch pipeline. The structure is convenient for controlling the use states of the middle-layer spraying and the top-layer spraying according to requirements, for example, the first branch pipeline can be closed, the second branch pipeline can be opened, and only the top-layer spraying is carried out; the first branch pipeline can be opened, the second branch pipeline can be closed, and only middle-layer spraying is carried out, so that more use requirements are met.

Compared with the prior art, the utility model has the advantages of: the utility model provides an impeller structure for a double-pump system, and a double-pump system and a cleaning machine applying the impeller structure, wherein the impeller structure is used in a closed volute of the double-pump system to provide power for upper-layer spraying water, which is beneficial to improving the lift and water flow of the upper-layer spraying water; in the open type double-pump system of the utility model, the second holding cavity, the first holding cavity and the upper impeller which are positioned at the upper part supply water for bottom spraying, and the third holding cavity and the impeller structure which are positioned at the lower part supply water for top and/or middle spraying, because the power of two paths of water flow is independently supplied by the corresponding pump, the lift and the water flow of each path of water flow are improved, which is beneficial to improving the cleaning effect; the utility model discloses a dismouting of being convenient for of double pump system will go up the casing and pull down on the casing down, can wash last casing, last impeller and casing down, avoids bacterial growing.

Drawings

Fig. 1 is a schematic structural diagram of a dual pump system according to an embodiment of the present invention;

FIG. 2 is a schematic view of the structure of FIG. 1 from another angle;

FIG. 3 is a cross-sectional view of a dual pump system according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a lower housing in an embodiment of the present invention;

FIG. 5 is a schematic view of the structure of FIG. 4 from another angle;

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

FIG. 7 is a schematic structural view of a cleaning machine according to an embodiment of the present invention;

fig. 8 is a schematic view of an impeller structure in an embodiment of the present invention;

FIG. 9 is a schematic view of the structure of FIG. 8 at another angle;

fig. 10 is a bottom view of the impeller structure according to the embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

The dual pump system of the present embodiment can be applied to a dishwasher having a large volume to supply water for bottom spray, top spray and/or middle spray, but the dual pump system of the present embodiment is not limited to this use environment.

As shown in fig. 1 to 6, the dual pump system of the present embodiment includes an upper impeller 1, an impeller structure 2, an upper housing 3, a lower housing 4, and a driving member 5.

The upper impeller 1 has a first shaft 11 located at the center and a plurality of first blades 12 distributed on the circumferential surface of the first shaft 11 at intervals in the circumferential direction and extending in the axial direction, and the upper part of each first blade 12 is a centrifugal blade and the lower part thereof is an axial flow blade.

The upper casing 3 has a body extending in a length direction, a first receiving cavity 31 for mounting an upper portion of the first vane 12 is formed at a central portion of the body, flow passages communicating with the first receiving cavity 31 are respectively formed at both sides of the body, and a nozzle hole 32 communicating with the flow passages is formed at 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 blade 12, and the side wall 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 the impeller structure 2, the bottom wall of the lower shell 4 is provided with a second water inlet 421 for water to enter the third accommodating cavity 42, and the side wall is provided with a water outlet 422 for water to be output from the third accommodating cavity 42.

The driving part 5 is a motor, is arranged below the lower casing 4, and the output shaft 51 is arranged upward, and the output shaft 51 penetrates through the lower casing 4 from bottom to top and extends into the first accommodating cavity 31 of the upper casing 3, and is respectively connected with the impeller structure 2 and the upper impeller 1, and is used for driving the upper impeller 1 and the impeller structure 2 to rotate.

Specifically, as shown in fig. 3 and 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. The second accommodating cavity 41 and the third accommodating cavity 42 are relatively independent, so that water supply for downward spraying through the upper impeller 1 and water supply for top and/or middle spraying through the impeller structure 2 are facilitated, mutual fluid disturbance is reduced, capacity loss is reduced, and water flow lift, water flow and spraying force are improved.

The third accommodating cavity 42 is located below the partition plate 43 and is approximately disc-shaped, the second water inlet 421 is arranged at the center of the bottom wall of the lower shell 4, and the water outlet 422 is tangentially connected with the third accommodating cavity 42 through the guide pipeline 423, so that the structure is favorable for reducing the capacity loss of the third accommodating cavity 42 in outputting water flow.

The second receiving cavity 41 is located above the partition 43 and extends vertically, and the inner diameter of the second receiving cavity 41 is smaller than the inner diameter of the third receiving cavity 42 and is adapted to the lower portion of the first blade 12. 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.

As shown in fig. 3, a third water inlet 34 is formed on the bottom wall of the upper housing 3 and arranged corresponding to the first accommodating chamber 31, and the third water inlet 34 is butted against the upper port of the second accommodating chamber 41. The diameter of the third water inlet 34 is larger than the inner diameter of the second accommodating chamber 41, and the inner diameter of the upper part of the lower housing 4 near the upper end of the second accommodating chamber 41 is gradually enlarged to form a guide part 412 which can be smoothly transited and connected with the inner bottom wall of the first accommodating chamber 31. This structure is advantageous for reducing the loss of the water flow in the process of entering the first accommodation chamber 31 from the second accommodation chamber 41. The outer edge of the guide part 412 is disposed close to the inner edge of the third water inlet 34, and a stopper 413 extending in the radial direction and supported on the bottom wall of the upper housing 3 is disposed on the outer peripheral wall of the guide part 412, and the outer edge of the stopper 413 is disposed corresponding to the inner edge of the locking leg 33. This structure is favorable to improving the leakproofness of third inlet 34 department, avoids rivers to leak and influences the lift that the bottom sprays.

The output shaft 51 of the present embodiment is radially limited with the upper impeller 1 and the impeller structure 2, respectively, and a nut capable of preventing the upper impeller 1 from moving along the axial direction of the output shaft 51 is disposed at the upper end of the output shaft 51. By adopting the structure, the upper shell 3 is convenient to disassemble and assemble, the upper impeller 1 can be taken down after the upper shell 3 is taken down from the clamping ring 441, and the cavity on the upper parts of the upper shell 3, the upper impeller 1 and the lower shell 4 is cleaned, so that bacteria breeding is avoided, and the cleaning effect is improved.

In this embodiment, as shown in fig. 7, the cleaning machine to which the above-described dual pump system is applied includes a tank 6 and a water supply pipe 7 capable of supplying water from the bottom of the tank 6 upward, the lower housing 4 is constrained on the inner bottom wall of the tank 6, and the water outlet 422 is connected to the lower end of the water supply pipe 7. 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 middle of the box body, and the second branch pipeline 72 is used for conveying water flow to the top of the box body. By adopting the structure, the spraying of the lower layer, the middle layer and the top layer is realized, and the cleaning effect is favorably improved.

The bottom of the box 6 is further provided with a shunt valve 8 for controlling whether the first branch pipeline 71 and the second branch pipeline 72 circulate, a water inlet of the shunt valve 8 is connected with a water outlet 422 of the lower shell 4, a first water outlet of the shunt valve 8 is connected with an input end of the first branch pipeline 71, and a second water outlet of the shunt valve 8 is connected with an input end of the second branch pipeline 72. The structure is convenient for controlling the use state of the middle-layer and top-layer spraying according to the requirement, for example, the first branch pipeline 71 can be closed, the second branch pipeline 72 can be opened, and only the top-layer spraying is carried out; the first branch pipeline 71 can be opened, the second branch pipeline 72 can be closed, and only middle-layer spraying is carried out, so that more use requirements can be met.

When the water pump is used, the output shaft 51 of the driving part 5 rotates to drive the upper impeller 1 and the impeller structure 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 chamber 42, and conveys the water to the water supply pipeline 7 through the water outlet 422 along the guide pipeline 423 in the circumferential direction, and the water supply pipeline 7 conveys the water upwards for top and/or middle spraying.

In the present embodiment, as shown in fig. 8 to 10, the impeller structure 2 has a shaft 21 located at the center and a plurality of blades 22 circumferentially spaced on the outer peripheral wall of the shaft 21, a cover plate 23 located on the top of the blades 22 is further disposed on the outer peripheral wall of the shaft 21, the lower wall surface of the cover plate 23 is in smooth transition connection with the blades 22, and the diameter of the cover plate 23 is smaller than that of the blades 22.

The outer peripheral wall of the shaft 21 located below the cover plate 23 partially or totally extends outward in the radial direction gradually from bottom to top to form an arc surface 211, and the upper end of the arc surface 211 is smoothly connected with the lower wall surface of the cover plate 23. After being assembled into the dual-pump system, the arc surface 211 is arranged just corresponding to the second water inlet 421, which is beneficial to quickly disperse the inlet water along the circumferential direction and reduces the energy loss in the dispersion process.

The arc radius of the cambered surface 211 is R1, the height of the blade 22 is H, and R1 is (0.8-1.8): 1; the height of the blade 22 is 8.5-9.5 mm, and the arc radius of the arc surface 211 is 10-15 mm. The diameter of the blade 22 is D, the diameter of the cover plate 23 is D, and D is (0.4-0.85) D; the diameter of the blade 22 is 45-58 mm, and the diameter of the cover plate 23 is 28-42 mm. Because the impeller structure 2 of this embodiment is used for top spraying and/or the rivers that middle part sprays provide power in the dish washer, and the parameter of impeller structure 2 directly determines this way water discharge and lift, adopts above-mentioned parameter, through experimental verification, numerical simulation and the service environment that combines in the box dish washer, has obtained ideal effect, makes the upper strata spray and has higher washing effect.

The blade 22 includes a first portion 221 disposed corresponding to the cover plate 23 and a second portion 222 disposed outside the cover plate 23, wherein the first portion 221 extends in a radial direction of the shaft 21, and the second portion 222 extends from an edge of the cover plate 23 outward in a rotation direction of the shaft 21. From a top view, the length of the first portion 221 is L1, the length of the second portion 222 is L2, L2 is K (L1+ L2), and K is 0.4 to 0.5. The acute angle formed between the first part 221 and the second part 222 is

The optimum value is 30 °. By adopting the structure, the water-saving device is beneficial to improving the work done on waterThereby improving the lift and water flow of the upper spraying water.

The number of the blades 22 is 6 to 10, preferably 8. When the number of the blades 22 is less, less work is done on the fluid in unit time, and the lift and the flow of the pump in the dishwasher are not up to the standard; however, when the number of the blades 22 reaches a certain number, the lift and the flow are increased only by increasing the number of the blades 22, and the lift and the flow are decreased due to the increase of the space occupied by the flow channel of the impeller caused by the increase of the number of the blades 22.

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 present invention, but these terms are used herein for convenience of description only and are determined based on example orientations shown in the drawings. Because the disclosed embodiments may be arranged in different orientations, these directional terms are for illustrative purposes only and should not be construed as limiting, and for example, "upper" and "lower" are not necessarily limited to orientations opposite or consistent with the direction of gravity.

The term "fluid communication" as used herein refers to a spatial relationship between two components or portions (hereinafter collectively referred to as a first portion and a second portion), i.e., a fluid (gas, liquid or a mixture of both) can flow along a flow path from the first portion or/and be transported to the second portion, and may be directly communicated between the first portion and the second portion, or indirectly communicated between the first portion and the second portion via at least one third member, which may be a fluid passage such as a pipe, a channel, a duct, a flow guide, a hole, a groove, or a chamber allowing the fluid to flow therethrough, or a combination thereof.

Claims (26)

1. An impeller structure having a centrally located shaft (21) and a plurality of circumferentially spaced blades (22) on the outer peripheral wall of the shaft (21), characterized in that: the outer circumferential wall of the shaft (21) is further provided with a cover plate (23) positioned at the top of the blade (22), the lower wall surface of the cover plate (23) is connected with the blade (22) in a smooth transition mode, and the diameter of the cover plate (23) is smaller than that of the blade (22).

2. The impeller structure of claim 1, wherein: the outer peripheral wall of the shaft (21) positioned below the cover plate (23) at least partially extends outwards along the radial direction from bottom to top gradually to form an arc surface (211), and the upper end of the arc surface (211) is smoothly connected with the lower wall surface of the cover plate (23).

3. The impeller structure of claim 2, wherein: the arc radius of the arc surface (211) is R1, the height of the blade (22) is H, and R1: H is (0.8-1.8): 1.

4. The impeller structure of claim 3, wherein: the height of the blade (22) is 8.5-9.5 mm, and the arc radius of the arc surface (211) is 10-15 mm.

5. The impeller structure of claim 1, wherein: the diameter of the blade (22) is D, the diameter of the cover plate (23) is D, and D is (0.4-0.85) D.

6. The impeller structure of claim 5, wherein: the diameter of the blade (22) is 45-58 mm, and the diameter of the cover plate (23) is 28-42 mm.

7. The impeller structure of claim 1, wherein: the blade (22) comprises a first part (221) arranged corresponding to the cover plate (23) and a second part (222) positioned outside the cover plate (23), wherein the first part (221) extends along the radial direction of the shaft (21), and the second part (222) extends outwards from the edge of the cover plate (23) along the rotating direction of the shaft (21).

8. The impeller structure of claim 7, wherein: the length of the first part (221) is L1, the length of the second part (222) is L2, and L2 is K (L1+ L2), and K is 0.4-0.5 in a top view.

9. The impeller structure of claim 7, wherein: the acute angle formed between the first part (221) and the second part (222) is

10. The impeller structure of claim 1, wherein: the number of the blades (22) is 6-10.

11. A dual pump system using the impeller structure of any one of claims 1 to 10, wherein: comprises that

An upper impeller (1) having a first shaft (11) located at the center and first blades (12) that are circumferentially spaced apart from each other on the circumferential surface of the first shaft (11) and extend in the axial direction;

the impeller structure (2);

the upper shell (3) is provided with a first accommodating cavity (31) for mounting the upper part of the first blade (12), and the top wall and/or the side wall of the upper shell (3) is/are provided with spray holes (32) which are communicated with the first accommodating cavity (31) in a fluid mode; and

lower casing (4), connect in the below of last casing (3), the upper portion of lower casing (4) has second holding chamber (41) that is used for installing first blade (12) lower part, it has first water inlet (411) that supplies water to get into in second holding chamber (41) to open on the lateral wall of lower casing (4), the lower part of lower casing (4) has third holding chamber (42) that are used for installing impeller structure (2), it has second water inlet (421) that supplies water to get into in third holding chamber (42) and delivery port (422) of export from third holding chamber (42) to open on the lateral wall and/or the diapire of lower casing (4).

12. The dual pump system of claim 11, wherein: and a partition plate (43) used for dividing the second accommodating cavity (41) and the third accommodating cavity (42) into relatively independent cavities is arranged in the middle of the lower shell (4).

13. The dual pump system of claim 12, wherein: the third accommodating cavity (42) is located below the partition plate (43) and is approximately disc-shaped, the second water inlet (421) is formed in the bottom wall of the lower shell (4), and the water outlet (422) is formed in the side wall of the lower shell (4) and is tangentially connected with the third accommodating cavity (42) through a guide pipeline (423).

14. The dual pump system of claim 12, 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 blade (12).

15. The dual pump system of claim 14, 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).

16. The dual pump system of claim 11, 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).

17. The dual pump system of claim 16, 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).

18. The dual pump system of claim 11, wherein: and a third water inlet (34) arranged corresponding to the first accommodating cavity (31) is formed in the bottom wall of the upper shell (3), and the third water inlet (34) is butted with the upper end opening of the second accommodating cavity (41).

19. The dual pump system of claim 18, wherein: the diameter of the third water inlet (34) is larger than the inner diameter of the second accommodating cavity (41), and the inner diameter of the upper part of the lower shell (4) close to the upper end of the second accommodating cavity (41) is gradually enlarged to form a guide part (412) which can be smoothly transited and connected with the inner bottom wall of the first accommodating cavity (31).

20. The dual pump system of claim 19, wherein: the outer edge of the guide part (412) is close to the inner edge of the third water inlet (34), and a blocking piece (413) which extends along the radial direction and is supported on the bottom wall of the upper shell (3) is arranged on the outer peripheral wall of the guide part (412).

21. The dual pump system of any one of claims 11-20, wherein: the second water inlet (421) is arranged on the bottom wall of the lower shell (4), and the smooth transition position between the lower wall surface of the cover plate (23) and the blades (22) in the impeller structure (2) is arranged corresponding to the second water inlet (421).

22. The dual pump system of any one of claims 11-20, wherein: still including being used for driving impeller (1), the rotatory driving piece (5) of impeller structure (2), below and output shaft (51) of casing (4) are arranged up down in this driving piece (5) are located, output shaft (51) pass from bottom to top down casing (4) stretch into in first holding chamber (31) of casing (3) and be connected with impeller structure (2), last impeller (1) respectively.

23. The dual pump system of claim 22, wherein: the output shaft (51) is radially limited with the upper impeller (1) and the impeller structure (2) respectively, and a nut capable of preventing the upper impeller (1) from moving along the axial direction of the output shaft (51) is arranged at the upper end of the output shaft (51).

24. A cleaning machine using a double pump system according to any one of claims 11 to 23, comprising a tank (6) and a water supply pipe (7) for supplying water from the bottom of the tank (6) upwards, characterized in that: the lower shell (4) is restricted on the inner bottom wall of the box body (6) and the water outlet (422) is connected with the lower end of the water supply pipeline (7).

25. The cleaning machine of claim 24, wherein: the water supply pipeline (7) is internally 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 middle of the box body (6), and the second branch pipeline (72) is used for conveying water flow to the top of the box body (6).

26. The cleaning machine of claim 25, wherein: the bottom of the box body (6) is also provided with a shunt valve (8) used for controlling whether the first branch pipeline (71) and the second branch pipeline (72) circulate or not, a water inlet of the shunt valve (8) is connected with a water outlet (422) of the lower shell (4), a first water outlet (422) of the shunt valve is connected with the input end of the first branch pipeline (71), and a second water outlet (422) of the shunt valve is connected with the input end of the second branch pipeline (72).

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