CN109973423B

CN109973423B - Water pump impeller for cleaning machine and application thereof

Info

Publication number: CN109973423B
Application number: CN201711464754.2A
Authority: CN
Inventors: 徐慧; 郑峰; 顾洪良
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2017-12-28
Filing date: 2017-12-28
Publication date: 2021-05-18
Anticipated expiration: 2037-12-28
Also published as: CN109973423A

Abstract

The invention relates to a water pump impeller for a washing machine, comprising a second impeller capable of radially dispersing a fluid at least at a first end, characterized in that: the fluid pumping device further comprises a first impeller capable of pumping fluid in the axial direction, wherein the first impeller is arranged at the second end of the second impeller and is coaxial with the second impeller. During the use, because first impeller is axial, therefore rivers are the biggest at the relative velocity of flow of first impeller outer fringe, can take place the vacuole at first impeller outer fringe at first, when reacing the second impeller, the vacuole of outer fringe is compressed by centrifugal force to the liquid that is close to the second impeller center pin, make it can only be close to the outer fringe along axial displacement, the high-pressure zone that the vacuole formed at second impeller upper end collapses, thereby restricted the development of vacuole greatly and promoted the anti cavitation erosion ability of second impeller, the flow and the lift of pump have been promoted, and then the cleaning performance of spray arm and cleaning machine has been improved.

Description

Water pump impeller for cleaning machine and application thereof

Technical Field

The invention relates to a water pump impeller for a cleaning machine, in particular to a water pump impeller which can be used in cleaning machines for bowls, dishes, fruits, vegetables and the like to improve the cleaning effect.

Background

Before the water pump works, the water pump and the water inlet pipe must be filled with water, then the liquid obtains energy under the action of inertial centrifugal force by means of the impeller rotating at high speed, so that the internal pressure of the liquid can be increased, when the impeller rotates fast, the first blade promotes the water to rotate fast, the liquid flies out of the impeller under the action of the centrifugal force, after the water in the water pump is thrown out, the central part of the impeller forms a vacuum area, then the water in a water source enters the water inlet pipe under the action of atmospheric pressure (or water pressure), and continuous water pumping can be realized after circulation is inexhaustible. The water pump has the advantages of simple structure, easy operation, easy flow regulation, suitability for conveying various materials with special properties and the like, and is widely applied to various fields, such as various industrial places, and various household appliances, such as washing machines, dish washing machines, air conditioners and the like.

In a traditional water pump, an impeller is generally positioned in a closed cavity, so that the structure is complex, and the processing requirement is high. European patent publication EP0807396a2 discloses a dishwasher using an open water pump, which includes a washing chamber for receiving dishes, a spray arm supported at the bottom of the washing chamber, and a pump for pumping out washing liquid to pressurize the spray arm, the pump including an impeller having an inner surface defining a housing for the impeller to allow the washing liquid to be transferred from the housing to a nozzle of the spray arm, the impeller including a first blade bent forward at a lower edge, the bottom of the first blade having a first blade portion of axial flow, the first blade portion of axial flow lifting up the fluid after a start-up of a driving motor under no load, thereby allowing the pump to operate normally. However, in the impeller, the lower section of the first blade is short, the first blade needs to be at a high water level when the first blade draws water in a rotating manner, the water outlet channel is short, foam formed on the surface of the cleaning water such as cleaning solution and food residue is easily drawn into the impeller again, normal water drawing is affected, the amount of drawn water is small, and the flow speed is low, so that normal spraying operation of the rotary spray arm is affected.

In order to solve the above problems, chinese patent application No. CN104235061B, an open water pump (application No. CN201310750285.6), discloses a structure including an upper housing, a lower housing, and an impeller, where the impeller includes a central shaft and a plurality of axially extending first blades uniformly distributed on a circumferential surface of the shaft in a circumferential direction, the first blades are axially divided into an upper section and a lower section connected to each other, an upper housing cavity for housing the upper section of the first blades is formed in the upper housing, a lower housing cavity for housing the lower section of the first blades is formed in the lower housing, a water inlet of the water pump is located below and at a side surface of the lower housing, a water outlet is located at a side surface of the upper housing, at least a bottom of the lower section of the first blades is gradually and smoothly bent on the circumferential surface of the shaft in a rotation direction of the impeller, and a height ratio of the lower section to the upper section of the first blades is 1-5. The impeller can draw water at a low water level, is not easy to cause bubbles formed by cleaning solution or food residues on the water surface to be drawn into the impeller to influence the water drawing, and can draw enough flow from the water inlet. However, since the first blades for the axial pumping and the centrifugal dispersion are integrally formed and the first blade portion for the axial pumping is short, when cavitation bubbles carried in the liquid develop to a certain extent during the pumping, the characteristics of the outer edge of the first blade are affected to cause performance degradation, since the liquid in the flow passage of the centrifugal first blade flows from the axial direction to the radial direction and the density of the liquid is higher than that of the gas, the cavitation bubbles in the liquid are easily separated under the action of the centrifugal force and rapidly expand to block the flow passage, so that the suction performance of the pump is rapidly reduced, and further the flow rate of the discharged water is affected.

Disclosure of Invention

The first technical problem to be solved by the invention is to provide a water pump impeller for a cleaning machine, which can improve the flow rate and the lift by limiting the development of cavitation bubbles in liquid, aiming at the current situation of the prior art.

The second technical problem to be solved by the present invention is to provide a spray arm using the above water pump, aiming at the current situation of the prior art, the spray arm has fast water outlet speed and good cleaning effect.

The third technical problem to be solved by the invention is to provide a cleaning machine using the water pump, aiming at the current situation of the prior art, and the cleaning machine inhibits the development of cavitation bubbles in the spray arm, improves the water outlet performance of the spray arm and further improves the cleaning effect.

The technical scheme adopted by the invention for solving the technical problems is as follows: a water pump impeller for a washing machine, comprising a second impeller capable of radially dispersing a fluid at least at a first end, characterized in that: the fluid pumping device further comprises a first impeller capable of pumping fluid in the axial direction, wherein the first impeller is arranged at the second end of the second impeller and is coaxial with the second impeller.

Preferably, the first impeller includes a first central shaft and first blades provided on an outer peripheral surface of the first central shaft.

Preferably, the first blade extends spirally in the axial direction on the outer peripheral surface of the first center shaft.

Preferably, the first blade is a single piece.

Preferably, the number of turns of the first blade on the outer peripheral surface of the first center shaft is greater than one.

Preferably, the number of turns of the first blade on the outer peripheral surface of the first center shaft is less than one.

Preferably, the number of turns of the first blade on the outer peripheral surface of the first center shaft is equal to one turn.

Preferably, the first blades are arranged spirally at equal intervals on the outer circumferential surface of the first central shaft.

Preferably, the first blades are arranged in an unequal pitch spiral on the outer circumferential surface of the first central shaft.

Preferably, the first blades are arranged spirally with a pitch gradually increasing from upstream to downstream on the outer peripheral surface of the first central shaft in the fluid flow direction.

Preferably, the first blades are arranged in a spiral with a pitch gradually decreasing from upstream to downstream on the outer circumferential surface of the first central shaft in the fluid flow direction.

Preferably, the first blades are arranged spirally on the outer circumferential surface of the first central shaft from upstream to downstream with a pitch alternately changing in magnitude according to the fluid flow direction.

Preferably, the first blades are distributed with equal diameters on the outer peripheral surface of the first central shaft.

Preferably, the first blades are distributed in a variable diameter mode on the outer peripheral surface of the first central shaft.

Preferably, the first blade diameters are distributed in an alternating size in the spiral direction.

Preferably, the first blade diameter is gradually increased from upstream to downstream on the outer peripheral surface of the first center shaft in the fluid flow direction.

Preferably, the first blade diameter is gradually reduced from upstream to downstream on the outer peripheral surface of the first center shaft in the fluid flow direction.

Preferably, the first blades are distributed in an equal thickness on the outer peripheral surface of the first central shaft.

Preferably, the first blade thickness varies continuously along the axial direction of the first central shaft.

Preferably, the first vane thickness decreases progressively from upstream to downstream, in terms of the direction of fluid flow.

Preferably, the first vane thickness gradually increases from upstream to downstream in terms of the fluid flow direction.

Preferably, the thickness of the first blade is distributed in an alternating size from upstream to downstream according to the flow direction of the fluid.

Preferably, according to the fluid flow direction, the starting end of the first blade is flush with the starting end surface of the first central shaft, and the tail end of the first blade is flush with the tail end surface of the first central shaft.

Preferably, the starting end of the first blade is located downstream of the starting end of the first central shaft, and the tip of the first blade is flush with the tip face of the first central shaft, in terms of the fluid flow direction.

Preferably, the starting end of the first blade is located downstream of the starting end of the first central shaft and the terminal end of the first blade is located upstream of the terminal end of the first central shaft in terms of the fluid flow direction.

Preferably, the first blade is two-piece.

Preferably, the two first blades are arranged in a staggered spiral on the outer peripheral surface of the first central shaft.

Preferably, the total number of turns of the spiral of the two first blades on the outer peripheral surface of the first central shaft is greater than one turn.

Preferably, the total number of turns of the spiral of the two first blades on the outer peripheral surface of the first central shaft is less than one.

Preferably, the total number of turns of the spiral of the two first blades on the outer peripheral surface of the first central shaft is equal to one turn.

Preferably, the second impeller includes a second central shaft and at least two second blades spaced apart from and disposed on an outer periphery of the second central shaft.

Preferably, the second central shaft has an outer diameter gradually increasing in the fluid flow direction to form an end cap, and at least part of the edge of the second blade is connected to an inner end surface of the end cap.

Preferably, the second blades are spirally distributed on the end cover and the second central shaft.

Preferably, the second vanes are arranged on the end cover and the second central shaft in a radial direction of the second central shaft.

Preferably, the second vane is axially divided into an upper section and a lower section which are connected to each other, and the length of the upper section in the radial direction is greater than the length of the lower section in the radial direction.

Preferably, the second blades are arranged at equal intervals on the outer periphery of the second central shaft.

Preferably, the second blades are arranged at intervals on the periphery of the second central shaft.

Preferably, the thicknesses of the second blades are equal.

Preferably, the thickness of at least one second blade is greater than the thickness of the other second blades.

Preferably, the thickness of the second blade gradually increases in the fluid flow direction.

Preferably, the thickness of the second blade is gradually reduced in the fluid flow direction.

In each of the above preferred embodiments, the water pump further includes a driving mechanism capable of providing power for the rotation of the second impeller and the first impeller. Preferably, the driving mechanism is a motor, and an output shaft of the motor is connected with central shafts of the second impeller and the first impeller.

Preferably, the first impeller further includes a cylindrically shaped shaft sleeve provided at an outer periphery of the first blade and coaxially arranged with the first central axis, and an outer edge of the first blade is connected to an inner circumferential wall of the shaft sleeve.

Preferably, the number of the first impellers is more than or equal to two, and the impellers are connected end to end in the axial direction.

The utility model provides an use spray arm of above-mentioned water pump, includes the spray arm body, thereby this spray arm body inside cavity forms the water storage chamber, it has water inlet and apopore that are linked together with this water storage chamber to open on the spray arm body, its characterized in that: the water pump impeller for the cleaning machine is characterized by further comprising a water pump impeller for the cleaning machine, at least part of a second impeller in the water pump impeller for the cleaning machine penetrates through the water inlet to be located in the water storage cavity, and the first impeller is arranged on the upstream of the water inlet according to the flow direction of fluid.

The spray arm comprises a spray arm body and is characterized in that a water inlet of the spray arm body is provided with a flow guide sleeve, at least part of a first impeller is positioned in the flow guide sleeve, and the first impeller, a second impeller, the inner wall of the flow guide sleeve matched with the first impeller and the inner wall of a water storage cavity matched with the second impeller jointly form a water pump.

The utility model provides an use cleaning machine that has above-mentioned spray arm, includes the box and spray arm, the box has local recessed position at least so that form the waterlogging caused by excessive rainfall region, and the waterlogging caused by excessive rainfall board has been put to this waterlogging caused by excessive rainfall region top lid, spray arm can locate waterlogging caused by excessive rainfall board top, its characterized in that with rotating: the first impeller penetrates through the draining plate, the upper portion of the first impeller is located above the draining plate, and the lower portion of the first impeller is located below the draining plate.

The utility model provides an use cleaning machine that has above-mentioned water pump, includes the box that has the washing chamber, its characterized in that: the water pump impeller for the cleaning machine is provided with a pump shell arranged at the bottom of the box body, the top of the pump shell is provided with a containing cavity which can be connected with the mounting port and is used for collecting water, and the second impeller and the first impeller are arranged on one side of the containing cavity and are used for pumping water in the containing cavity into the box body through the mounting port.

Compared with the prior art, the invention has the advantages that: when the spray arm cleaning machine is used, because the first impeller is axial, the relative flow velocity of water flow on the outer edge of the first impeller is the maximum, cavitation bubbles can be generated on the outer edge of the first impeller at first, when the water flow reaches the second impeller, liquid close to the central shaft of the second impeller compresses the cavitation bubbles on the outer edge under the action of centrifugal force, so that the liquid can only move close to the outer edge along the axial direction, and the cavitation bubbles collapse in a high-pressure area formed on the upper end of the second impeller, thereby greatly limiting the development of the cavitation bubbles, improving the cavitation erosion resistance of the second impeller, improving the flow and lift of the pump, and further improving the cleaning effect of the spray arm and the cleaning machine.

Drawings

Fig. 1 is a schematic structural view of a water pump impeller for a washing machine in embodiment 1 of the present invention;

fig. 2 is a schematic structural diagram of a first impeller in embodiments 1 and 8 of the present invention;

fig. 3 is another schematic structural diagram of the first impeller in embodiments 1 and 8 of the present invention;

fig. 4 is a schematic structural view of a first impeller according to embodiments 1 and 8 of the present invention;

fig. 5 is a schematic structural diagram of a first impeller in

embodiments

2, 4 and 8 of the present invention;

fig. 6 is another schematic structural diagram of the first impeller in embodiments 2 and 8 of the present invention;

fig. 7 is a schematic structural view of a first impeller according to embodiments 2 and 8 of the present invention;

fig. 8 is a schematic structural diagram of a first impeller in embodiments 3 and 8 of the present invention;

fig. 9 is another schematic structural view of a first impeller in embodiment 3 of the present invention;

fig. 10 is a schematic structural view of a first impeller in embodiment 4 of the present invention;

fig. 11 is a schematic structural view of a first impeller in embodiment 18 of the present invention;

fig. 12 is a schematic structural view of a first impeller in embodiment 19 of the present invention;

FIG. 13 is a schematic view showing another structure of a first impeller in embodiment 19 of the present invention;

fig. 14 is a schematic structural view of a second impeller in embodiment 1 of the present invention;

fig. 15 is another schematic structural view of a second impeller in embodiment 1 of the present invention;

FIG. 16 is a schematic structural view of a second impeller in embodiment 20 of the present invention;

fig. 17 is a schematic structural view of a second impeller in embodiment 21 of the invention;

FIG. 18 is a schematic structural view of a second impeller in embodiment 22 of the present invention;

fig. 19 is a schematic structural view of a second impeller in embodiment 25 of the present invention;

fig. 20 is a schematic structural view of a second impeller in embodiment 26 of the invention;

fig. 21 is a schematic structural view of a second impeller in embodiment 27 of the invention;

fig. 22 is a schematic structural view of a second impeller in embodiment 28 of the present invention;

fig. 23 is a schematic structural view of a spray arm in embodiment 29 of the present invention;

FIG. 24 is a schematic view showing a structure of a cleaning machine in embodiment 30 of the present invention;

FIG. 25 is a schematic view showing another construction of a cleaning machine in embodiment 30 of the present invention;

fig. 26 is a schematic structural view of a cleaning machine in embodiment 31 of the present invention.

Detailed Description

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

Example 1:

as shown in fig. 1, the water pump impeller for a washing machine of the present embodiment includes a first impeller 1, a second impeller 2, and a driving mechanism 3, the first impeller 1 is disposed upstream of the second impeller 2 in terms of the fluid flow direction, and in the present embodiment, the first impeller 1 is disposed at one end of the second impeller 2 and is coaxially disposed with the second impeller 2 to rotate synchronously. The driving mechanism 3 of the present embodiment is a motor for providing power to rotate the second impeller 2 and the first impeller 1. An output shaft 31 of the motor is connected to the central shafts of the second impeller 2 and the first impeller 1. The first impeller 1 is used for drawing water flow in the axial direction, and the second impeller 2 has a certain flow guiding effect on the water flow drawn by the first impeller 1 and enables the fluid to be dispersed in the radial direction.

Specifically, the first impeller 1 includes a first central shaft 11 and a first blade 12 disposed on an outer peripheral surface of the first central shaft 11, the first blade 12 extends spirally in an axial direction on the outer peripheral surface of the first central shaft 11, and a number of spiral turns of the first blade 12 on the outer peripheral surface of the first central shaft 11 is less than one.

The first blade 12 of the present embodiment is one piece or two pieces. When the first blade 12 is one piece, as shown in fig. 2, the first blade 12 has a number of turns of the first central shaft 11 less than half a turn; as shown in fig. 3, the number of turns of the first blade 12 on the first center shaft 11 is equal to half a turn; as shown in fig. 4, when the first blades 12 are two blades, the total number of turns of the two first blades 12 on the first central shaft 11 is less than one, and the number of turns of each first blade 12 on the first central shaft 11 is less than half a turn.

According to the fluid flow direction, the starting end of the first blade 12 is flush with the starting end surface of the first center shaft 11, and the end of the first blade 12 is flush with the end surface of the first center shaft 11.

The second impeller 2 of the present embodiment includes a second central shaft 21 and a plurality of second blades 22, and the second blades 22 are arranged at intervals on the outer periphery of the second central shaft 21. The outer diameter of the second central shaft 21 is gradually increased in the fluid flow direction to form an end cover 23, and at least part of the edge of the second blade 22 is connected to the inner end surface of the end cover 23.

The second blades 22 of the present embodiment are spirally distributed on the end cover 23 and the second central shaft 21, and the spiral direction may be clockwise as shown in fig. 14 or counterclockwise as shown in fig. 15. The thickness of each second blade 22 was equal and 1.8 mm.

Example 2:

this example differs from example 1 in that: the number of turns of the first blade 12 on the outer peripheral surface of the first center shaft 11 is greater than one. As shown in fig. 5, the first blade 12 may be a single blade and the number of turns of the first blade 12 is greater than one; as shown in fig. 6 and 7, the number of the first blades 12 may be 2, and the number of turns of each first blade 12 is greater than half of a turn.

Example 3:

the present embodiment differs from the above embodiments in that: the number of turns of the first blade 12 on the outer peripheral surface of the first center shaft 11 is equal to one turn. As shown in fig. 8, the first blade 12 may be a single blade, and the number of turns of the first blade 12 is one turn; as shown in fig. 9, the first blades 12 may be two, two first blades 12 may be arranged in a staggered spiral on the outer circumferential surface of the first central shaft 11, and the number of spiral turns of each first blade 12 is half a turn.

Example 4:

the present embodiment differs from the above embodiments in that: when the number of turns of the first blade 12 is greater than one turn, as shown in fig. 5 and 10, the first blade 12 is spirally arranged on the outer circumferential surface of the first central shaft 11 at equal intervals, the pitch is 15 to 30mm, and the optimal pitch is 26 mm.

Example 5:

this example differs from example 4 in that: the first blades 12 of the present embodiment are spirally arranged at unequal pitches on the outer peripheral surface of the first central shaft 11, and according to the fluid flowing direction, the first blades 12 are spirally arranged at a pitch gradually increasing from upstream to downstream on the outer peripheral surface of the first central shaft 11, the pitch of the starting end is 15-24 mm, the optimal starting pitch is 24mm, the pitch of the tail end is 25-30 mm, and the optimal tail end is 28 mm.

Example 6:

this example differs from example 5 only in that: according to the fluid flowing direction, the first blades 12 of the present embodiment are spirally arranged on the outer peripheral surface of the first central shaft 11 from upstream to downstream with a pitch gradually decreasing, the pitch at the starting end is 25 to 30mm, the optimal starting pitch is 28mm, the pitch at the tail end is 15 to 24mm, and the optimal tail end is 24 mm.

Example 7:

this example differs from example 5 only in that: according to the fluid flowing direction, the first blades 12 of the present embodiment are spirally arranged on the outer circumferential surface of the first central shaft 11 from upstream to downstream in a manner of pitch size alternating, the pitch has a plurality of change regions connected end to end, the minimum pitch end of one change region is connected with the minimum pitch end of another change region, the pitch of the maximum pitch end in each change region is 25 to 30mm, preferably 28mm, and the pitch of the minimum pitch end is 15 to 24mm, preferably 24 mm.

Example 8:

the present embodiment is different from the above embodiments only in that: as shown in fig. 2 to 10, the first blades 12 are distributed on the outer peripheral surface of the first central shaft 11 in an equal diameter, and the diameter of the first blades 12 is 25 to 40mm, preferably 33 mm.

Example 9:

this example differs from example 8 in that: the first blades 12 of this embodiment are distributed with a variable diameter on the outer peripheral surface of the first central shaft 11. The diameters of the first blades 12 are distributed in a size alternating manner in the spiral direction, the maximum diameter of the first blades 12 is 32-40 mm, preferably 33mm, and the minimum diameter of the first blades 12 is 25-31 mm, preferably 30 mm. The first blade 12 is provided with a plurality of gradual change areas which are connected end to end, the minimum diameter of one gradual change area is connected with the minimum diameter of the other gradual change area, and the spiral length of the inner edge of the first blade 12 of one gradual change area along the first central shaft 11 is 0.9-1.5 times, preferably 1.1 times of the length of the outer diameter of the first central shaft 11.

Example 10:

this example differs from example 8 in that: the diameter of the first blade 12 of this embodiment gradually increases from upstream to downstream on the outer peripheral surface of the first central shaft 11 according to the fluid flowing direction, the diameter of the starting end is 32 to 40mm, preferably 33mm, and the diameter of the end is 25 to 31mm, preferably 30 mm.

Example 11:

this example differs from example 8 in that: the diameter of the first blade 12 decreases gradually from upstream to downstream on the outer peripheral surface of the first central shaft 11 in the direction of fluid flow, with a diameter of 25 to 31mm, preferably 30mm, at the beginning and 32 to 40mm, preferably 33mm, at the end.

Example 12:

the present embodiment is different from the above embodiments in that: as shown in fig. 2 to 10, the first blades 12 are distributed on the outer peripheral surface of the first central shaft 11 in an equal thickness, and the first blades 12 have a thickness of 1.3 to 2.0mm, preferably 1.8 mm.

Example 13:

this example differs from example 12 in that: the thickness of the first blade 12 of this embodiment varies along the axial direction of the first central shaft 11. According to the fluid flowing direction, the thickness of the first blade 12 gradually decreases from the upstream to the downstream, the thickness of the starting end is 1.6 to 1.9mm, preferably 1.8mm, and the thickness of the tail end is 1.3 to 1.5mm, preferably 1.5 mm.

Example 14:

this example differs from example 12 in that: according to the fluid flowing direction, the thickness of the first blade 12 gradually increases from the upstream to the downstream, and the thickness of the starting end is 1.3-1.5 mm, preferably 1.5 mm; the thickness of the end is 1.6-1.9 mm, preferably 1.8 mm.

Example 15:

this example differs from example 12 in that: according to the fluid flow direction, the thickness of the first blade 12 is distributed from upstream to downstream in an alternating size change mode, the maximum thickness of the first blade 12 is 1.8mm, the minimum thickness of the first blade 12 is 1.5mm, the first blade 12 is provided with a plurality of evolution areas which are connected end to end, the minimum thickness end of one evolution area is connected with the minimum thickness end of the other evolution area, and the spiral length of the inner edge of the first blade 12 of one evolution area along the first central shaft 11 is 0.9-1.5 times, and the optimal spiral length is 1.1 times of the length of the outer diameter of the first central shaft 11.

Example 16:

the present embodiment is different from the above embodiments in that: the starting end of the first vane 12 is located downstream of the starting end of the first center shaft 11 in terms of the fluid flow direction, and the tip of the first vane 12 is flush with the tip end face of the first center shaft 11.

Example 17:

the present embodiment is different from the above embodiments in that: the starting end of the first vane 12 is located downstream of the starting end of the first central shaft 11 and the end of the first vane 12 is located upstream of the end of the first central shaft 11 in terms of the fluid flow direction.

Example 18:

the present embodiment is different from the above embodiments in that: as shown in fig. 11, the first impeller 1 of the present embodiment further includes a sleeve 13 formed in a cylindrical shape, the sleeve 13 being provided on the outer periphery of the first blade 12 and arranged coaxially with the first central shaft 11, and the outer edge of the first blade 12 being connected to the inner peripheral wall of the sleeve 13.

Example 19:

the present embodiment is different from the above embodiments in that: as shown in fig. 12 and 13, the number of the first impellers 1 is two or three, and the first impellers 11 are axially connected end to end. The first impeller 1 may include one first blade 12 or two first blades 12.

Example 20:

the present embodiment is different from the above embodiments in that: as shown in fig. 16, the second blades 22 of the present embodiment are arranged on the end cover 23 and the second center shaft 21 in the radial direction of the second center shaft 21. The second blades 22 are arranged at equal intervals on the outer periphery of the second central shaft 21.

Example 21:

this example differs from example 20 in that: the second blades 22 of the present embodiment are arranged at a variable pitch on the outer periphery of the second central axis 21, as shown in fig. 17, three second blades 22 form one group, and the pitch of two second blades 22 in the same group is smaller than the pitch between adjacent second blades 22 in different groups.

Example 22:

this example differs from example 1 in that: as shown in fig. 18, the thickness of a part of the second blades 22 of the present embodiment is larger than the thickness of the other second blades 22. The second blades 22 are arranged at intervals of thickness in the circumferential direction in the present embodiment. The blades with different thicknesses can not absorb water, and can generate pulse effect.

Example 23:

this example differs from example 1 in that: the thickness of the second vane 22 of the present embodiment gradually increases in the fluid flow direction. The thickness of the starting end of the second blade 22 is 1.6-1.9 mm, preferably 1.8 mm; the thickness of the end of the second blade 22 is 1.3-1.5 mm, preferably 1.5 mm.

Example 24:

this example differs from example 1 in that: the thickness of the second vane 22 of the present embodiment is gradually reduced in the fluid flow direction. The thickness of the starting end of the second blade 22 is 1.3-1.5 mm, preferably 1.5 mm; the thickness of the end of the second blade 22 is 1.6-1.9 mm, preferably 1.8 mm.

Example 25:

this example differs from example 1 in that: the second impeller 2 of the present embodiment has no end cap 23 at the top and has an open top structure. Specifically, as shown in fig. 19, the present embodiment shows a structure, but is not limited to this structure. The second vane 22 is axially divided into an upper section 221 and a lower section 222 which are connected with each other, the top of the upper section 221 is free from a shield and extends in the radial direction of the second central shaft 21, and the length of the upper section 221 in the radial direction is larger than that of the lower section 222 in the radial direction. The lower section 222 is gradually smoothly curved along the rotation direction of the second impeller 2 on the circumferential surface of the second center shaft 21, and the upper section 221 is perpendicular to the circumferential surface of the second center shaft 21.

Example 26:

this example differs from example 25 in that: as shown in fig. 20, the three second blades 22 form one blade group 20, and in the blade group 20, the length of the upper section 221 of the second blade 22 located in the middle for water flowing in the radial direction may be slightly smaller than the length of the upper sections 221 of the second blades 22 located on both sides. The distance between two adjacent blade groups 20 in the circumferential direction is greater than the distance between two adjacent second blades 22 in the circumferential direction.

The thickness of the second vane 22 is uniform, but the radial size distribution is not uniform, so that the force of the second impeller 2 when water is thrown out is also non-uniform, and the water can be sprayed similarly to pulse: the rush is relatively slow, thereby enhancing the dish washing effect.

Example 27:

this example differs from examples 25 and 26 in that: as shown in fig. 21, the second blades 22 are arranged at intervals of thickness in the circumferential direction in the present embodiment. The lower section of the second vane 22 having a larger thickness may have a length of 0 in the radial direction, and the upper surface is flush with the upper end surface of the second center shaft 21. The second vane 22 having a smaller thickness has a length in the radial direction larger than that of the second vane 22 having a larger thickness.

Example 28:

this example differs from example 25 in that: as shown in fig. 22, the width of at least one second blade 22 in the circumferential direction of the second central shaft 21 is larger than the width of the other second blades 22 in the circumferential direction of the second central shaft 21. The width of the upper section 221 of the wider second impeller 22 gradually increases from the outer peripheral surface of the second central shaft 21 to form a fan-shaped structure 220, so as to ensure that the second impeller maintains a good water-drawing capability during the rotation process, and the central angle of the fan-shaped structure formed by the upper section 221 is 5-90 °.

Example 29:

as shown in fig. 23, this embodiment shows a spray arm applied to the water pump impeller for the cleaning machine in any one of embodiments 1 to 28, and includes a spray arm body 4, the spray arm body 4 is hollow to form a water storage cavity 41, the spray arm body 4 is provided with a water inlet 411 and a water outlet 412 communicated with the water storage cavity 41, an upper end of a second impeller 2 in the water pump impeller for the cleaning machine penetrates through the water inlet 411 and is located in the water storage cavity 41, and a first impeller 1 is located at an upstream of the water inlet according to a fluid flowing direction.

The second blades 22 of the second impeller 2 of the present embodiment are shaped as a fan-shaped structure with a central angle arranged outwards and a notch 120 at the central angle, and the notch 120 is arranged opposite to the edge of the water inlet 411.

A flow guide sleeve is arranged at the water inlet 411 of the spray arm body 4, at least part of the first impeller 1 is positioned in the flow guide sleeve, and the first impeller 1, the second impeller 2, the inner wall of the flow guide sleeve matched with the first impeller 1 and the inner wall of the water storage cavity 41 matched with the second impeller 2 jointly form a water pump.

Example 30:

as shown in fig. 24 and 25, this embodiment shows a cleaning machine to which the spray arm of embodiment 23 is applied, and the cleaning machine of this embodiment is a water tank type cleaning machine with an opening at the top, but of course, the cleaning machine may be designed to be a cleaning machine with an opening at the side wall as required. The cleaning machine comprises a box body (not shown) and a spray arm, wherein the box body is at least provided with a local concave part to form a draining area 51, a draining plate 52 is covered above the draining area 51, the spray arm is rotatably arranged above the draining plate 52, a first impeller 1 is arranged through the draining plate 52, the upper part of the first impeller 1 is positioned above the draining plate 52, and the lower part of the first impeller 1 is positioned below the draining plate 52.

The draining area 51 of the present embodiment may be an elongated area gradually depressed from the center toward the periphery as shown in fig. 25, or the draining area 51 may be a partially or entirely wide area by providing the shape of the bottom wall of the draining area 51 or the draining plate 52 as shown in fig. 24.

Example 31:

as shown in fig. 26, this embodiment shows a cleaning machine applied with the water pump in any one of embodiments 1 to 22, including a box 6 having a washing chamber 61, a mounting port 62 is opened at the bottom of the box 6, a water pump impeller for the cleaning machine has a pump housing 14 mounted at the bottom of the box 6, the top of the pump housing 14 has an accommodating chamber 141 connected with the mounting port 62 and used for collecting water, and a second impeller 2 and a first impeller 1 are disposed at one side of the accommodating chamber 141 and used for pumping water in the accommodating chamber 141 into the washing chamber 61 of the box 1 through the mounting port 62.

Claims

1. A water pump impeller for a washing machine, comprising a second impeller capable of radially dispersing a fluid at least at a first end, characterized in that: the first impeller is arranged at the second end of the second impeller and is coaxially arranged with the second impeller;

the first impeller comprises a first central shaft and first blades arranged on the peripheral surface of the first central shaft, and the first blades spirally extend on the peripheral surface of the first central shaft along the axial direction;

the second impeller comprises a second central shaft and at least two second blades which are arranged at the periphery of the second central shaft at intervals;

according to the fluid flowing direction, the first impeller is arranged at the upstream of the water inlet of the water pump;

the first blades are distributed on the peripheral surface of the first central shaft in a diameter-variable manner;

the thickness of the first blade continuously changes along the axial direction of the first central shaft;

the first impeller further comprises a shaft sleeve which is shaped like a cylinder and is arranged on the periphery of the first blade and is coaxial with the first central shaft, and the outer edge of the first blade is connected with the inner peripheral wall of the shaft sleeve.

2. The water pump impeller for a washing machine as claimed in claim 1, characterized in that: the first blade is one piece.

3. The water pump impeller for a washing machine as claimed in claim 1, characterized in that: the first blades are two.

4. A water pump impeller for a washing machine according to claim 1, 2 or 3, characterized in that: the number of spiral turns of the first blade on the outer peripheral surface of the first central shaft is larger than one.

5. A water pump impeller for a washing machine according to claim 1, 2 or 3, characterized in that: the number of spiral turns of the first blade on the outer peripheral surface of the first central shaft is less than one.

6. A water pump impeller for a washing machine according to claim 1, 2 or 3, characterized in that: the number of spiral turns of the first blade on the outer peripheral surface of the first central shaft is equal to one turn.

7. The water pump impeller for a washing machine as claimed in claim 4, characterized in that: the first blades are spirally arranged on the outer peripheral surface of the first central shaft at equal intervals.

8. The water pump impeller for a washing machine as claimed in claim 4, characterized in that: the first blades are spirally arranged on the outer peripheral surface of the first central shaft at unequal intervals.

9. The water pump impeller for a washing machine as claimed in claim 8, characterized in that: the first blades are arranged spirally with a pitch gradually increasing from upstream to downstream on the outer peripheral surface of the first central shaft in the fluid flow direction.

10. The water pump impeller for a washing machine as claimed in claim 8, characterized in that: the first blades are arranged spirally on the outer peripheral surface of the first central shaft from upstream to downstream with a pitch gradually decreasing in the fluid flow direction.

11. The water pump impeller for a washing machine as claimed in claim 8, characterized in that: the first blades are arranged spirally on the outer peripheral surface of the first central shaft from upstream to downstream with the pitch alternately changing in size according to the fluid flow direction.

12. The water pump impeller for a washing machine as claimed in claim 1, characterized in that: the diameters of the first blades are distributed in a size alternating mode in the spiral direction.

13. The water pump impeller for a washing machine as claimed in claim 1, characterized in that: the first vane diameter gradually increases from upstream to downstream on the outer peripheral surface of the first center shaft in the fluid flow direction.

14. The water pump impeller for a washing machine as claimed in claim 1, characterized in that: the diameter of the first blade gradually decreases from upstream to downstream on the outer peripheral surface of the first center shaft in the fluid flow direction.

15. The water pump impeller for a washing machine as claimed in claim 1, characterized in that: the first vane thickness gradually decreases from upstream to downstream in the direction of fluid flow.

16. The water pump impeller for a washing machine as claimed in claim 1, characterized in that: the first vane has a thickness that gradually increases from upstream to downstream in the direction of fluid flow.

17. The water pump impeller for a washing machine as claimed in claim 1, characterized in that: the thickness of the first blade is distributed from upstream to downstream in an alternating size distribution according to the flow direction of the fluid.

18. The water pump impeller for a washing machine as claimed in any one of claims 1 to 3, characterized in that: according to the fluid flowing direction, the starting end of the first blade is flush with the starting end surface of the first central shaft, and the tail end of the first blade is flush with the tail end surface of the first central shaft.

19. The water pump impeller for a washing machine as claimed in any one of claims 1 to 3, characterized in that: the starting end of the first blade is located downstream of the starting end of the first center shaft in terms of the fluid flow direction, and the tip end of the first blade is flush with the tip end face of the first center shaft.

20. The water pump impeller for a washing machine as claimed in any one of claims 1 to 3, characterized in that: the starting end of the first blade is located downstream of the starting end of the first central shaft and the terminal end of the first blade is located upstream of the terminal end of the first central shaft in terms of the fluid flow direction.

21. The water pump impeller for a washing machine as claimed in claim 3, characterized in that: the two first blades are arranged in a staggered spiral on the outer peripheral surface of the first central shaft.

22. The water pump impeller for a washing machine as claimed in claim 1, characterized in that: the outer diameter of the second central shaft is gradually increased along the fluid flow direction to form an end cover, and at least part of the edge of the second blade is connected to the inner end face of the end cover.

23. The water pump impeller for a washing machine as claimed in claim 22, characterized in that: the second blades are spirally distributed on the end cover and the second central shaft.

24. The water pump impeller for a washing machine as claimed in claim 22, characterized in that: the second vanes are arranged on the end cover and the second central shaft along the radial direction of the second central shaft.

25. The water pump impeller for a washing machine as claimed in claim 1, characterized in that: the second blade is axially divided into an upper section and a lower section which are connected with each other, and the length of the upper section in the radial direction is larger than that of the lower section in the radial direction.

26. The water pump impeller for a washing machine as claimed in claim 24, characterized in that: the second blades are arranged at equal intervals on the periphery of the second central shaft.

27. The water pump impeller for a washing machine as claimed in claim 24, characterized in that: the second blades are arranged on the periphery of the second central shaft at variable intervals.

28. The water pump impeller for a washing machine as claimed in claim 24, characterized in that: the thicknesses of the second blades are equal.

29. The water pump impeller for a washing machine as claimed in claim 24, characterized in that: the thickness of at least one second blade is greater than the thickness of the other second blades.

30. The water pump impeller for a washing machine as claimed in claim 24, characterized in that: the thickness of the second blade gradually increases along the fluid flow direction.

31. The water pump impeller for a washing machine as claimed in claim 24, characterized in that: the thickness of the second blade gradually decreases in the direction of fluid flow.

32. The water pump impeller for a washing machine as claimed in any one of claims 1 to 3, characterized in that: and the second impeller and the first impeller are connected with a driving mechanism capable of providing power for the rotation of the second impeller and the first impeller.

33. The water pump impeller for a washing machine as claimed in claim 32, characterized in that: the driving mechanism is a motor, and an output shaft of the motor is connected with central shafts of the second impeller and the first impeller.

34. The water pump impeller for a washing machine as claimed in any one of claims 1 to 3, characterized in that: the number of the first impellers is more than or equal to two, and the first impellers are connected end to end in the axial direction.

35. A spray arm with the water pump impeller of any one of claims 1-34 applied thereto, comprising a spray arm body, the spray arm body being hollow to form a water storage cavity, the spray arm body being provided with a water inlet and a water outlet communicated with the water storage cavity, characterized in that: the water pump impeller for the cleaning machine is characterized by further comprising a water pump impeller for the cleaning machine, at least part of a second impeller in the water pump impeller for the cleaning machine penetrates through the water inlet to be located in the water storage cavity, and the first impeller is arranged on the upstream of the water inlet according to the flow direction of fluid.

36. The spray arm of claim 35, wherein: the spray arm comprises a spray arm body and is characterized in that a water inlet of the spray arm body is provided with a flow guide sleeve, at least part of a first impeller is positioned in the flow guide sleeve, and the first impeller, a second impeller, the inner wall of the flow guide sleeve matched with the first impeller and the inner wall of a water storage cavity matched with the second impeller jointly form a water pump.

37. A cleaning machine using the spray arm of claim 35, comprising a box body and the spray arm, wherein the bottom of the box body is at least partially recessed to form a draining area, a draining plate is covered above the draining area, and the spray arm is rotatably arranged above the draining plate, and the cleaning machine is characterized in that: the first impeller penetrates through the draining plate, the upper portion of the first impeller is located above the draining plate, and the lower portion of the first impeller is located below the draining plate.

38. A cleaning machine using the water pump impeller of any one of claims 1 to 34, comprising a tank having a washing chamber, wherein: the water pump impeller for the cleaning machine is provided with a pump shell arranged at the bottom of the box body, the top of the pump shell is provided with a containing cavity which can be connected with the mounting port and is used for collecting water, and the second impeller and the first impeller are arranged on one side of the containing cavity and are used for pumping water in the containing cavity into the box body through the mounting port.