CN216554573U - Impeller structure, double-pump system and cleaning machine - Google Patents

Abstract

The utility model relates to an impeller structure and application thereof, wherein the impeller structure is provided with a shaft positioned in the center and a plurality of blades which are distributed on the peripheral wall of the shaft at intervals along the circumferential direction, each blade is provided with an upper section and a lower section which are mutually connected, the upper section is a centrifugal blade, the lower section is an axial flow blade which is gradually bent along the rotation direction of the shaft from top to bottom, and the axial flow blade is formed by mutually connecting a first blade body with a first radian and a second blade body with a second radian. In the open type double-pump system, the second accommodating cavity, the first accommodating cavity and the upper impeller which are positioned at the upper part supply water for spraying at the bottom, and the third accommodating cavity and the impeller which are positioned at the lower part supply water for spraying at the top and/or the middle part, because the power of two paths of water flow is independently supplied by the corresponding pumps, the lift and the water flow of each path of water flow are improved, and the cleaning effect is favorably improved; the double-pump system is convenient to disassemble and assemble, the upper shell is disassembled from the lower shell, the upper impeller and the lower shell can be cleaned, and bacteria are prevented from breeding.

Description

Impeller structure, double-pump system and cleaning machine

Technical Field

The utility model relates to the technical field of dish washing machines, in particular to an impeller structure, a double-pump system applying the impeller structure 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 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 first technical problem to be solved by the present invention is to provide an impeller structure which is beneficial to increase the lift and water flow of water flow so as to improve 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 dual pump system using the above impeller 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.

A third technical problem to be solved by the present invention is to provide a dual pump system that employs an open volute to facilitate disassembly, assembly, and cleaning, in view of the current situation of the prior art.

The fourth technical problem to be solved by the present invention is to provide a cleaning machine with the above dual-pump system, aiming at the current situation of the prior art.

The technical scheme adopted by the utility model for solving at least one technical problem is as follows: an impeller structure having a centrally located shaft and a plurality of circumferentially spaced blades on the peripheral wall of the shaft, characterized in that: the blade has upper segment and hypomere that links up each other, the upper segment is centrifugal blade, the hypomere is the axial compressor blade that top-down is crooked gradually along the direction of rotation of axle, and this axial compressor blade is formed by linking up each other with the second lamellar body that has the second radian by the first lamellar body that has first radian.

In the above scheme, first lamellar body is connected on the periphery wall of axle and outside extension, the second lamellar body is located the outside of first lamellar body, just the upper end of second lamellar body is aligned with the upper end of first lamellar body, the arc surface that first lamellar body corresponds and the arc surface intercrossing that the second lamellar body corresponds, first lamellar body and second lamellar body dock each other at the intersection that the two corresponds the arc surface and form the axial compressor blade that has the distortion structure. By adopting the structure, the water absorption performance is favorably improved, so that the water flow and the lift of a corresponding water channel are improved, and meanwhile, the structure can also reduce the condition that the axial flow blades generate bubbles in the water flow stirring process, so that the water flow lift is further improved.

From a top view or a bottom view, the lower end edge of the axial flow blade is arranged just corresponding to the upper end edge of the adjacent axial flow blade.

Preferably, the radius of the circular arc corresponding to the cross section of the first sheet body is R, the radius of the circular arc corresponding to the cross section of the second sheet body is R, and R: R is (2-5): 1, and more preferably, R: R is (2.5-3.5): 1. Tests prove that the axial flow blade with the corresponding twisted structure can obtain better water absorption performance and bubbling resistance performance by adopting the parameters.

Preferably, the centrifugal blade includes a first portion disposed above the corresponding axial blade and a second portion extending outward from the first portion, the first portion extending obliquely in the rotational direction of the shaft on the outer circumferential wall of the shaft, and the second portion being bent from an outer edge of the first portion in the rotational direction of the shaft. The bottom edge of the second part gradually extends downwards from outside to inside to form an arc section which is smoothly connected with the outer edge of the axial flow blade. The structure is favorable for dispersing the inlet water along the circumferential direction quickly, and reduces the energy loss in the dispersing process.

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 top 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 top of the blade is provided with an end cover, and the peripheral wall of the shaft corresponding to the centrifugal blade at least partially extends outwards gradually from bottom to top to form an arc surface which is smoothly transitionally connected with the lower wall surface of the end cover; the top wall of the end cover is gradually inclined downwards from the edge to the middle to form a concave area, and the upper end of the shaft is arranged corresponding to the central part of the concave area. This structure is favorable to reducing energy loss, improves lift and discharge.

In the utility model, the height of the upper section is H1, the height of the lower section is H2, and H1: H2 ═ (1.1-1.5): 1. The impeller structure is used for providing power for the water flow sprayed from the top and/or the middle of the dish washing machine, and the parameters of the impeller structure directly determine the water flow and the lift of the 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 impeller structure;

the lower impeller is provided with a second shaft positioned in the center and second blades which are distributed on the circumferential surface of the second shaft at intervals along the circumferential direction;

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 impeller 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 and/or the diapire of casing 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. This structure is favorable to reducing rivers and gets into the loss of ability of first holding chamber in-process from the second holding chamber.

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 impeller structure is positioned above the first water inlet, and the vertical distance between the lower end of the axial flow blade and the upper edge of the first water inlet is 0.1-1 mm, preferably 0.8 mm. The distance is controlled to be 0.8mm, and the axial flow blade can be combined with the structure of the axial flow blade to improve the water absorption performance and the anti-bubbling performance.

In each of the above schemes, the dual-pump system further includes a driving member for driving the upper impeller and the lower impeller to rotate, the driving member is disposed below the lower casing, the output shaft is disposed upward, the output shaft penetrates the lower casing from bottom to top and extends into the first accommodating cavity of the upper casing, and the output shaft is connected with the lower impeller 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 radially limited with the upper impeller and the lower impeller respectively, 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 that: the utility model provides an impeller structure for a double-pump system, and the 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, so that the improvement of the lift and water flow of the upper-layer spraying water is facilitated; in the open type double-pump system, the second accommodating cavity, the first accommodating cavity and the upper impeller which are positioned at the upper part supply water for spraying at the bottom, and the third accommodating cavity and the impeller which are positioned at the lower part supply water for spraying at the top and/or the middle part, because the power of two paths of water flow is independently supplied by the corresponding pumps, the lift and the water flow of each path of water flow are improved, and the cleaning effect is favorably improved; the double-pump system is convenient to disassemble and assemble, the upper shell is disassembled from the lower shell, the upper impeller and the lower shell can be cleaned, and bacteria are prevented from breeding.

Drawings

FIG. 1 is a schematic 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 diagram of a lower housing according to 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 the lower housing in an embodiment of the present invention;

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

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

fig. 11 is a sectional view (plan view) of an impeller structure in an embodiment of the present invention.

Detailed Description

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

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, a lower impeller 2, an upper housing 3, a lower housing 4, and a driving member 5.

The lower impeller 2 has 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 casing 3 has a body extending in a length direction, a first receiving cavity 31 for mounting an upper portion of the first blade 12 is formed in a central portion of the body, flow passages communicated with the first receiving cavity 31 are respectively formed in both sides of the body, a spray hole 32 communicated with the flow passages is formed in a top wall of the upper casing 3, and the upper casing 3 forms a bottom spray structure.

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 supplying water into the second accommodating cavity 41; the lower part of the lower shell 4 is provided with a third containing cavity 42 for installing the lower impeller 2, the bottom wall of the lower shell 4 is provided with a second water inlet 421 for water to enter the third containing cavity 42, and the side wall is provided with a water outlet 422 for water to be output from the third containing cavity 42.

The driving part 5 is a motor, is arranged below the lower shell 4, and the output shaft 51 is arranged upward, and the output shaft 51 penetrates through the lower shell 4 from bottom to top and extends into the first accommodating cavity 31 of the upper shell 3, and is respectively connected with the lower impeller 2 and the upper impeller 1, and is used for driving the upper impeller 1 and the lower impeller 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 lower spraying through the upper impeller 1 and water supply for top and/or middle spraying through the lower impeller 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 to the upper impeller 1 and the lower impeller 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 pipe 71 may be opened, the second branch pipe 72 may be closed, and only the middle layer of spraying may be performed to satisfy more use requirements.

When the water pump is used, the output shaft 51 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 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 11, the impeller structure 1 includes a central shaft 11 and a plurality of blades 12 circumferentially spaced on an outer peripheral wall of the shaft 11, each blade 12 has an upper section and a lower section that are connected to each other, the upper section is a centrifugal blade 121, the lower section is an axial flow blade 122 that is gradually curved from top to bottom along a rotation direction of the shaft, and the axial flow blade 122 is formed by connecting a first blade 1221 having a first arc and a second blade 1222 having a second arc to each other.

Specifically, the first blade 1221 is connected to the outer peripheral wall of the shaft 11 and extends outward, the second blade 1222 is located outside the first blade 1221, the upper end of the second blade 1222 is aligned with the upper end of the first blade 1221, the arc surface corresponding to the first blade 1221 and the arc surface corresponding to the second blade 1222 intersect with each other, and the first blade 1221 and the second blade 1222 are butted with each other at the intersection of the arc surfaces corresponding to each other to form the axial blade 122 with the twisted structure 1220. By adopting the structure, the water absorption performance is favorably improved, so that the water flow and the lift of a corresponding water channel are improved, and meanwhile, the structure can also reduce the condition that the axial flow blades generate bubbles in the water flow stirring process, so that the water flow lift is further improved.

The radius of the arc corresponding to the cross section of the first sheet 1221 is R, the radius of the arc corresponding to the cross section of the second sheet 1222 is R, and R: R is (2 to 5):1, and more preferably R: R is (2.5 to 3.5): 1. Tests prove that the axial flow blade 122 with the corresponding twisted structure 1220 can obtain better water absorption performance and bubbling resistance performance by adopting the parameters.

The centrifugal blade 121 includes a first portion 1211 disposed above the corresponding axial blade 122 and a second portion 1212 extending outward from the first portion 1211, wherein the first portion 1211 extends obliquely in the rotational direction of the shaft 11 on the outer circumferential wall of the shaft 11, and the second portion 1212 is bent from the outer edge of the first portion 1211 in the rotational direction of the shaft 11. The bottom edge of the second portion 1212 gradually extends downward from the outside to the inside to form a circular arc section 1213 smoothly joining with the outer edge of the axial flow blade 122. The structure is favorable for dispersing the inlet water along the circumferential direction quickly, and reduces the energy loss in the dispersing process.

From a top view, the length of the first portion 1211 is L1, the length of the second portion 1212 is L2, L2 is K (L1+ L2), and K is 0.4 to 0.5. The first portion 1211 has an oblique angle θ, θ being 30 °; the acute angle formed between the first portion 1211 and the second portion 1212 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.

The top of the blade 12 of this embodiment is provided with an end cover 13, and at least part of the outer peripheral wall of the shaft 11 corresponding to the centrifugal blade 121 gradually extends outwards from bottom to top to form an arc surface 111 which is smoothly transitionally joined with the lower wall surface of the end cover 13; the top wall of the end cap 13 is formed with a recessed area 131 gradually inclined downward from the edge toward the center, and the upper end of the shaft 11 is disposed corresponding to the center of the recessed area 131. This structure is favorable to reducing energy loss, improves lift and discharge.

In the embodiment, the height of the upper section is H1, the height of the lower section is H2, and H1: H2 ═ 1.1-1.5: 1. Because the impeller structure of this embodiment is used for top spraying and/or the rivers that the middle part sprays in the dish washer provide power, and the parameter of impeller structure directly determines this way rivers 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 number of the blades 12 is 6 to 10, preferably 8. When the number of the blades 12 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 12 reaches a certain number, the lift and the flow are increased only by continuously increasing the number of the blades 12, and the lift and the flow are reduced 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 12.

After assembly in the dual pump system, the impeller structure 1 is located above the first water inlet 411, and the vertical distance between the lower end of the axial flow blade 122 and the upper edge of the first water inlet 411 is 0.1-1 mm, preferably 0.8 mm.

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.

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, respectively), i.e., a fluid (gas, liquid or a mixture of both) can flow along a flow path from the first portion and/or be transported to the second portion, and may be a direct communication between the first portion and the second portion, or an indirect communication between the first portion and the second portion via at least one third element, such as a fluid channel, e.g., a pipe, a channel, a duct, a flow guide, a hole, a groove, or a chamber that allows a fluid to flow through, or a combination thereof.

Claims (25)

1. An impeller structure having a centrally located shaft (11) and a plurality of circumferentially spaced blades (12) on the outer peripheral wall of the shaft (11), characterized in that: the blade (12) is provided with an upper section and a lower section which are mutually connected, the upper section is a centrifugal blade (121), the lower section is an axial flow blade (122) which is gradually bent from top to bottom along the rotation direction of the shaft (11), and the axial flow blade (122) is formed by mutually connecting a first blade body (1221) with a first radian and a second blade body (1222) with a second radian;

the axial flow blade is characterized in that the first sheet body (1221) is connected to the outer peripheral wall of the shaft (11) and extends outwards, the second sheet body (1222) is located on the outer side of the first sheet body (1221), the upper end of the second sheet body (1222) is aligned with the upper end of the first sheet body (1221), the arc surface corresponding to the first sheet body (1221) and the arc surface corresponding to the second sheet body (1222) are crossed with each other, and the first sheet body (1221) and the second sheet body (1222) are mutually butted at the crossed position of the corresponding arc surfaces to form the axial flow blade (122) with the twisted structure (1220).

2. The impeller structure of claim 1, wherein: the radius of a circular arc corresponding to the cross section of the first sheet body (1221) is R, the radius of a circular arc corresponding to the cross section of the second sheet body (1222) is R, and R: R (2-5): 1.

3. The impeller structure of claim 2, wherein: r is (2.5-3.5) 1.

4. The impeller structure of claim 1, wherein: the centrifugal blade (121) comprises a first portion (1211) arranged above the corresponding axial blade (122) and a second portion (1212) extending outwards from the first portion (1211), wherein the first portion (1211) extends obliquely on the outer peripheral wall of the shaft (11) along the rotating direction of the shaft (11), and the second portion (1212) is bent from the outer edge of the first portion (1211) along the rotating direction of the shaft (11).

5. The impeller structure according to claim 4, characterized in that: the bottom edge of the second portion (1212) gradually extends downwards from outside to inside to form a circular arc section (1213) which is smoothly jointed with the outer edge of the axial flow blade (122).

6. The impeller structure of claim 4, wherein: the first portion 1211 has a length L1, the second portion 1212 has a length L2, and L2 is K (L1+ L2), and K is 0.4 to 0.5 in a plan view.

7. The impeller structure of claim 6, wherein: the acute angle formed between the first portion (1211) and the second portion (1212) is

8. The impeller structure of claim 1, wherein: the top of the blade (12) is provided with an end cover (13), and at least part of the outer peripheral wall of the shaft (11) corresponding to the centrifugal blade (121) gradually extends outwards from bottom to top to form an arc surface (111) which is smoothly transited and jointed with the lower wall surface of the end cover (13); the top wall of the end cover (13) is gradually inclined downwards from the edge to the middle to form a concave area (131), and the upper end of the shaft (11) is arranged corresponding to the central part of the concave area (131).

9. The impeller structure of claim 1, wherein: the height of the upper section is H1, the height of the lower section is H2, and H1: H2 ═ 1.1-1.5: 1.

10. A dual pump system using the impeller structure of any one of claims 1 to 9, wherein: comprises that

The impeller structure;

a lower impeller (2) having a second shaft (21) located at the center and second blades (22) circumferentially spaced apart from each other on the circumferential surface of the second shaft (21);

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 lower impeller (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).

11. The dual pump system of claim 10, 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).

12. The dual pump system of claim 11, wherein: the third accommodating cavity (42) is located below the partition plate (43) and 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 tangentially connected with the third accommodating cavity (42) through a guide pipeline (423).

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

14. The dual pump system of claim 13, 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).

15. The dual pump system of claim 10, 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).

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

17. The dual pump system of claim 10, 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).

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

19. The dual pump system of claim 18, 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 in 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).

20. The dual pump system of any one of claims 10-19, wherein: the impeller structure is located above the first water inlet (411), and the vertical distance between the lower end of the axial flow blade (122) and the upper edge of the first water inlet (411) is 0.1-1 mm.

21. The dual pump system of any one of claims 10-19, wherein: the impeller is characterized by further comprising a driving piece (5) for driving the upper impeller (1) and the lower impeller (2) to rotate, wherein the driving piece (5) is arranged below the lower shell (4) and the output shaft (51) is arranged upwards, and the output shaft (51) penetrates through the lower shell (4) from bottom to top to extend into the first accommodating cavity (31) of the upper shell (3) and is connected with the lower impeller (2) and the upper impeller (1) respectively.

22. The dual pump system of claim 21, wherein: the output shaft (51) is radially limited with the upper impeller (1) and the lower impeller (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).

23. A cleaning machine using a double pump system according to any one of claims 10 to 22, 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).

24. The cleaning machine of claim 23, 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).

25. The cleaning machine of claim 24, 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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