CN103671131A

CN103671131A - Pump

Info

Publication number: CN103671131A
Application number: CN201310532313.7A
Authority: CN
Inventors: U·克格尔; S·罗特; T·阿尔贝特
Original assignee: EGO Elektro Geratebau GmbH
Current assignee: EGO Elektro Geratebau GmbH
Priority date: 2012-09-12
Filing date: 2013-09-12
Publication date: 2014-03-26
Also published as: EP2708754A3; DE102012216196A1; US20140072414A1; EP2708754A2

Abstract

A pump having a pump chamber and an impeller which rotates therein has an inlet leading into the pump chamber and an outlet leading out of the pump chamber, the pump having a pump motor having a rotor. The rotor and the impeller are connected to each other, the impeller being supported in an axial direction towards the inlet and an axial support being provided therefor against an axial bearing. In this instance, the axial bearing is located on a rotation axis of the rotor and includes a centrally supported concave bearing shell in which a convex-curved bearing projection of the impeller is in abutment.

Description

Pump

Technical field

The present invention relates to a kind of pump, especially a kind of pump that there is pump chamber and the impeller rotating, introducing/lead to the entrance in pump chamber and draw/lead to the outlet outside pump chamber in its pump chamber.

Background technique

Corresponding pump is known from EP1052410B1.The axially support that abuts against pump case for impeller obtains by means of two slip rings in this example, and this slip ring is the form of frictional bearing, and it is arranged between the terminal surface of impeller and the shoulder of pump case ingress.Except the axially support of impeller or comprise impeller and the element of construction of the rotor of pump engine, thus the suction side at impeller eye place and impeller outlet place on the pressure side between sealing is provided, to stop the backflow by the gap location between pump case and impeller to turn back to entrance.This is because this backflow will reduce the efficiency degree of pump greatly.

Summary of the invention

Target of the present invention is to provide a kind of pump of the type of having introduced, and can avoid the shortcoming of prior art by means of this pump, and particularly, it is possible that the actual axle of impeller has simple structure to support.

This target obtains by having the pump of claim 1 feature.Advantage of the present invention and preferred embodiment are set forth in appended claims, and explain in detail below.The word of these claims is included in the content of specification by clear and definite quoting.

Pump is provided, and it has pump chamber and rotor or impeller, and this rotor or impeller rotate in pump chamber.Entrance is incorporated in the pump chamber in pump case, and outlet is drawn again.In order to drive described impeller, this pump has pump engine, and this pump engine has rotor, and this rotor and this impeller are connected to each other.This pump engine is advantageously configured to brushless motor.This impeller, it is generally stowed towards entrance at run duration, is supported, just for this is former thereby provide axially support to abut against cod on this is axial towards entrance or away from rotor.

According to the present invention, cod is positioned on the spin axis of spin axis or this rotor, that is to say, is centering.This means the spin axis of this rotor, and the therefore spin axis of impeller, extend through the bearing surface of this cod.The spin axis of this rotor should not be misunderstood into motor axostylus axostyle, even if this spin axis is naturally to extending through vertically described motor axostylus axostyle.

The advantage of the layout of this central configuration and cod is that essential bearing surface can thereby keep relatively little.It is also relatively low that bearing surface on cod supports the relative velocity that faces toward and move each other.Thus, in other words, it is possible reducing physical dimension, or can reduce for the quantity of the material of cod, and its general material is special, unmanageable and/or expensive.Meanwhile, because impeller is drawn towards entrance, utilize this pump and the pressure that occurs is not large especially.In this, these power can also utilize the axially support of relatively little degree to absorb.In addition, compare the support that previously mentioned use slip ring carries out, can obtain therefrom the support of very low friction, it also has favourable effect aspect energy consumption of pump and the degree of efficiency.

Another advantage be the impeller in pump case layout thereby may be more accurate many, and simultaneously the manufacture of pump is more simply too much.Due to the support that utilizes cod to carry out in the region important for impeller, it can be point-device.This is explained in more detail below.

In advantageous embodiment of the present invention, rotor becomes a kind of element of construction with impeller construction.In this example, they are not only to fit together with some forms, and advantageously, or non-disconnectable remove or integrally manufacture of one-tenth.Rotor and impeller are advantageously carried out as a kind of structure of element of construction, even before pump assembling.For example, rotor and impeller can manufacture a kind of all-in-one-piece structure structure unit by plastic materials in injection moulding operation, are two or three steps in particularly advantageous mode.

In addition, element of construction comprises rotor and impeller, and it can advantageously be manufactured by this way, and impeller can be described as and is directly placed on rotor, or at least there is no pump chamber wall between them.Especially, be contemplated that between them and do not have pump chamber bottom, thereby make to construct and assemble, can be very easy to.Advantageously, for this object, impeller has larger diameter than rotor, thereby this member can be directly arranged on, points in described in-engine direction.

In embodiments of the invention, cod is arranged in the prolongation of entrance, in its region or the inner side of entrance.Thus, it is possible using cod of the present invention for the fondational structure of impeller, needn't need the change of excessive degree.

In addition, in particularly advantageous mode, entrance be this pump case in the axis of rotation or the region of the spin axis of rotor approach one of parts of rotor most.Therefore, the layout of cod is relatively simple in this example.Finally, the cod being arranged in entrance region also only interrupts/upsets being sent to the inflow in pump in little degree, because this wing pump is generally extrusion pump rather than suction pump.In this example, it is favourable that the cod on the spin axis of rotor is arranged in center in entrance, and described entrance also advantageously coaxially extends with respect to this spin axis, also can not form excessive flow resistance thus.

In another advantageous embodiment of the present invention, when looking up from footpath, cod can be positioned at the inner side of impeller or at its axial height place, particularly, and in the top in region.The structure of impeller can thereby be only in fact conventional.

In a preferred embodiment of the invention, cod is in fact freely positioned in this entrance or arranges within it.It is supported by means of a plurality of supporting elements in this ingress.Especially in the mode of support/pillar, it extends diametrically in particularly preferred mode, and its can be configured on cross section be smooth mode, thereby make they form in the axial direction may be minimum flow resistance.A plurality of supporting elements for cod can be provided, and can around cod or in peripheral direction, distribute by uniform mode.For example, can form 2 to 4 supporting elements for the sufficiently stable maintenance of cod is provided.

Impeller can have tubular upper, and it is pointing to the direction towards entrance.The entrance of entrance, particularly previously mentioned extension, can have circle or form circle, and it is engaging the tubular upper of impeller, and it is in fact still the form of short tube.This circle can form the taper part of entrance especially.Tubular upper and circle overlap each other in the axial direction, and it is for stoping excessive previously mentioned water from the pressure side to the backflow of inlet side.In this example, in particularly advantageous mode, enclose more extensible in the tubular upper of impeller.The supporting element of cod is arranged on ingress, extends or as far as possible far in the side towards impeller, extends upward, and can therefore be arranged in the inner side of the tubular upper of impeller in the tail end of this circle.Therefore, the cod side towards impeller far away in fact as far as possible extends upward.

Advantageously, cod has bearing or the plane bearing/plain bearing of frictional, and the element of construction of described impeller or with it moulding forms and supports.Frictional bearing can have bearing surface.In particularly advantageous mode, bearing projection is disposed in the projection inside impeller or on tubercle, this bearing projection can cooperate mutually with the frictional bearing of cod.Frictional bearing and bearing projection can be configured to such mode in this example, and they have curved part and groove/indenture, and one is against another or abut against each other and settle, and one is rotated in another.The shape of curved part and groove advantageously allows element of construction or impeller to be centered on the spin axis of rotor, and the also therefore whole pump of centering.Other supporting element that this means other supporting elements of element of construction or the rotor of pump engine must be constructed in simpler mode, particularly do not need other radial bearing, therefore its centering at a side place of the element of construction away from impeller, should only there will be in that position, and needn't extend beyond the whole length of element of construction.Curved part and groove are advantageously constructed by this way, and groove has larger radius or slightly smallerly crooked than the curved part being positioned at wherein.Previously mentionedly from centering, also thereby advantageously realize.

On cod, in the concave surface mode away from impeller, construct the frictional bearing being bent, and on impeller, structure has the bearing projection away from the convex bending of impeller, is possible.Therefore, the top of bearing projection or the recessed or groove of the cod that curved part is bonded on the ingress that is arranged in pump case of similar impeller.Uniform or circular in fact curved part is preferred.For in each case with the part of the form bending of convex surface, also, the similar top on cod, in fact can also provide very thin tip.Then, still, will manufacture the bearing of some type in fact, and its be also easily wearing and tearing and also on manufacturing, have very high requirement.

A part of constructing cod with plastic materials is possible.Other parts can comprise plastic materials and alternately/optional metal or graphite or stupalith.At least one aduncate frictional bearing that is form of grooves should be manufactured by plastic materials.In this example, for these bearings, operable is general preferred plastic materials, for example, and the plastic materials that the plastic materials that polyamide, Teflon are strengthened, POM or general fiber are strengthened.Operable metallic material comprises sintered bronze or brass, particularly when pump uses in dishwasher, also causes it anticorrosive.

The frictional bearing of cod is that advantageously injection-molded is in the above or therein on pump case or in ingress.Therefore, it can be fixedly attached to there in the identical operating procedure of manufacturing pump case.

Advantageously, with the frictional bearing of cod in connection with the bearing projection of impeller be also injection molded on it or therein.Also realized in this example simple and accurate manufacture.Alternatively, can also be separating component, it can be from inserting above, and due to the abutment pressure on cod during pump operation, it under any circumstance can not come off from impeller.

Advantageously, described element of construction rotates on a kind of fixing motor axostylus axostyle, and the spin axis of motor axostylus axostyle and rotor coaxially extends.This motor axostylus axostyle can be fixed on the end away from impeller, particularly pump on the motor body of the end away from entrance.Preferably, it is the motor axostylus axostyle of circle, and it rotates in spindle socket, and spindle socket is disposed in, and especially injection-molded is in rotor.The length of motor axostylus axostyle can freely be selected in wide limits.It can be almost the same with total unit long, and element of construction comprises rotor and impeller.But, because at the other end place, cod has been guaranteed support, and also have especially the centering of element of construction, motor axostylus axostyle does not need to grow especially and only several centimetres of projections or marginally enter in rotor.In fact, then this short motor axostylus axostyle must guarantee radially to fixedly secure rotor or element of construction, or the centering of rotor or element of construction.The centering of element of construction at the other end place is to form by the cod in ingress, and it is generally enough.

This or other feature not only accessory rights is understood in requiring; and also from specification He in accompanying drawing, understand; personal feature can individually realize; or with the embodiment of the present invention with sub-portfolio form in other field and together with realize; and can form favourable embodiment; favourable embodiment itself can be patented, and advocate protection in the present invention.The application's segmentation is partly divided into several other parts, and according to their general validity, middle title does not limit the statement of doing below.

Accompanying drawing explanation

Embodiments of the invention are schematically explanation in the accompanying drawings, and explains in detail below.In the accompanying drawings:

Accompanying drawing 1 is that this pump has element of construction through the side cross-sectional view according to pump of the present invention, and it comprises impeller and the rotor on fixing motor axostylus axostyle, and this axostylus axostyle abuts against a kind of cod in the ingress of pump and be supported,

Accompanying drawing 2 is zoomed-in views of the cod in accompanying drawing 1, the still non-holding state of this bearing before pump engine starts,

Accompanying drawing 3 is planimetric maps of the pump in accompanying drawing 1, when the situation of watching from the direction in cod points to entrance,

Accompanying drawing 4 shows a modification of the cod that is similar to the curved part in accompanying drawing 2 with transposition, and

Accompanying drawing 5 is another modification according to the cod in accompanying drawing 2.

Embodiment

Accompanying drawing 1 is the side cross-sectional view according to pump 11 of the present invention.It has a kind of pump part 12 that is possessing the pump chamber 13 in pump case 14.This pump 11 is configured to a kind of wing pump in the present embodiment significantly, and can advantageously in the household electric appliance of water guide, use, especially dishwasher or washing machine.

Central inlet 16 extends in pump chamber 13 along central axis, and this central axis utilizes dotted line to be illustrated.This entrance 16 has inlet duct 17, and it is at inner ring 18 split sheds radially.In addition, on pump case 14, be provided with outlet 19, can illustrate in this drawing, from the planimetric map of accompanying drawing 3, also can find out.

On the other hand, pump 11 has engine section 20, and it has stator 21 and rotor 22, and this rotor has rotor plate assembly 23 and magnet 23 '.Therefore, this be a kind of for such application known with brushless wet rotor routine.

In rotor 22, be a kind of spindle socket 25, it turns round on motor axostylus axostyle 26, and axostylus axostyle 26 inserts in engine section 20 securely.The region round rotor plate assembly 23 and magnet 23 ' of rotor 22 is by impeller 30 combinations or integratedly constructs, especially by means of previously mentioned injection moulding.This impeller 30 has substrate 31 and cover plate 32, and crooked impeller blade 33 is arranged between the two.This impeller it is well known to those having skill in the art that, for example, from the CN201310230688.8 of the same Applicant on June 9th, 2013, can find out this point.In addition, this impeller 30 has the top 34 of tubulose, and it is in conjunction with cover plate 32.In center region, umbo 35 is projected on substrate 31.It is so long that this motor axostylus axostyle 26 can extend to this umbo 35, but also essential extension is so long, and for example, the lower end that can only extend to spindle socket 25 is so far away.In the end of umbo 35, provide or arranged a kind of bearing projection 37, it is crooked in protruding mode a little or bend in the direction towards entrance 16.This can find out in the effective enlarged view from the accompanying drawing 2 the following describes.

In accompanying drawing 2, can find out, although be illustrated according to cod 39 of the present invention, for the reason of clearness, what illustrate is the state that not yet forms support.Thereby still have little space, for example, can meet the idling conditions of pump 11.At the opposite side of bearing projection 37, cod 39 has bearing shell 40, and it is arranged to, and for example, is stamped or injection-molded enters bearing retaining member 41.In some cases, may be also identical composition.Bearing retaining member 41 then by means of three poles 42, be maintained on pump case 14 or inlet duct 17 and circle 18 on, the radial arrangement of three poles 42 can be found out from accompanying drawing 3.Cod 39 or bearing retaining member 41 and pole 42 also can advantageously build with entrance integratedly.

If pump 11 starts, its impeller 30 described in tractive in the direction towards entrance 14, that is to say, downward direction in accompanying drawing 1.Bearing projection 37 is moved into the bearing shell 40 of cod 30 adjacent thus.Corresponding curved section has guaranteed that a kind of centering of the mechanism unit that comprises impeller 30 and rotor 22 realizes with respect to the spin axis of dot and dash line longitudinal center axis or rotor separately.For this reason, bearing projection 37 its outwardly-bent have with the aduncate groove of bearing shell 40 compare less radius, or higher curved surface.This difference can be, for example, in geometric mode, so explains, if comprise rounded face or circular in fact face, the radius of bearing shell 40 is that 1.5 times of bearing projection 37 are so large to 4 times.In the present embodiment, bearing projection 37 can comprise the plastic materials the same with other impeller 30.Alternatively, it can comprise independent application material.Identical situation is applicable to bearing shell 40; In this, the example that can select with reference to the material separately of describing in introduction.

Accompanying drawing 4 shows a kind of modification of cod 139, and in principle, the arrangement principle of the cod 139 on the spin axis of rotor is identical, and also provides in the present embodiment three poles 142.But bearing retaining member 141 curves inwardly in the present embodiment as in accompanying drawing 2, but replace with outwardly-bent part outwardly-bent or formation cod 139.

Be adjacent to there, the bearing projection 137 of impeller 130 has recessed shell 138 as a kind of similar bearing shell.As directed, it comprises the material different from bearing projection 137, and can be injection-molded or fixedly secure.With with as form roughly the same mutually in accompanying drawing 2, for a kind of good relationship that comprises adjacent to each other and centering effect, described in accompanying drawing 4, curved section is constructed to the different number of degrees.

Accompanying drawing 5 shows another modification, and it is similar to accompanying drawing 2.Cod 239 has bearing shell 240 in the present embodiment, and bearing shell 240 is kept by three poles 242.Bearing shell 240 is carried by bearing retaining member 241 and advantageously comprises hard material or metal, especially brass.A kind of bearing top 244 is provided in the bearing projection 237 of impeller 230, and it also advantageously comprises metal, and is fixedly secured or injection-molded.

Meanwhile, bearing shell 240 bending to be similar to the such mode of previous embodiment, bearing top 244 is configured to much sharper form.It can directly be designed to a kind of tip, and it is thin as much as possible, or alternatively its also have a kind of flat part, its leading portion or correspondingly rounded portions office have about 1mm diameter.Especially relevantly with aduncate bearing shell 240 a little more forcefully, also obtain thus very good centering.If material separately enough resistance to wears, also can obtain low frictional torque bearing thus, it also has favourable effect aspect the efficiency degree of energy consumption and pump.

Another very large advantage of structure with the pump 11 of cod 39 is that the axial position of the impeller 30 in pump chamber 13 can accurately be determined.Especially, between impeller 30 or cover plate 32 and the gap between the tubular upper 34 of pump case 14, especially, in the region of inlet duct 17 or circle 18, can be minimized, and not emit the direct danger in abutting connection with accident.

On the pressure side can be lowered therefrom to the loss flow of suction side from wing pump typically.Efficiency degree or the energy efficiency of pump 11 increase thus.This bearing of very accurately installing, except axially support, also further upgrading, is realized by the centering means of the concrete structure by means of cod 39.

Due to the structure of impeller 30, with combination together with its part of rotor 22 and cod, also can obtain very light and accurate assembly.

Claims

1. pump, the outlet that there is pump chamber and the impeller rotating in described pump chamber, be incorporated into the entrance in this pump chamber and draw from this pump chamber, this pump has pump engine, and this pump engine has for driving the rotor of this impeller, wherein this rotor and this impeller are connected to each other, this impeller is supported towards this entrance in the axial direction, and therefore provides a kind of axial support to abut against cod, and wherein this cod is positioned on the spin axis of this rotor.

2. pump as claimed in claim 1, wherein this rotor becomes a kind of element of construction with this impeller construction, even before this pump assembling.

3. pump as claimed in claim 2, wherein this rotor and this impeller manufacture a kind of element of construction of integral body.

4. pump as claimed in claim 3, wherein wraps this element of construction of this rotor of expansion and this impeller and in independent injection moulding operation, by plastic materials, is made as a whole.

5. pump as claimed in claim 1, wherein this rotor becomes a kind of between there is no the element of construction of pump chamber wall with this impeller construction, and this rotor and this impeller are arranged in this pump.

6. pump as claimed in claim 1, wherein this cod is positioned at the prolongation of this entrance, and in its region.

7. pump as claimed in claim 1, wherein when upwards watching from footpath, this cod is positioned at this impeller inner side or at the axial height place of this impeller.

8. pump as claimed in claim 1, wherein this cod projection exceeds this impeller outer.

9. pump as claimed in claim 1, wherein this cod is in fact freely positioned at this entrance, and supports by means of a plurality of supporting elements in this ingress.

10. pump as claimed in claim 9, wherein the plurality of supporting element is arranged in the peripheral direction towards pump case.

11. pumps as claimed in claim 1, wherein this impeller has the tubular upper in the direction towards entrance, and this entrance has the circle engaging with the tubular upper of this impeller.

12. pumps as claimed in claim 11, wherein this circle forms the tapered portion of this entrance, and this circle extension a bit enters in this tubular upper of this impeller.

13. pumps as claimed in claim 11, wherein for this supporting element as claimed in claim 9 of this cod, are arranged in the inner side of the tubular upper of this impeller.

14. pumps as claimed in claim 1, wherein this cod has the bearing of frictional, and it is in connection with this impeller or this element of construction.

15. pumps as claimed in claim 14, its middle (center) bearing projection arrangement is in the projection of impeller inner side, for the frictional bearing collaborative work with this cod.

16. pumps as claimed in claim 15, wherein this frictional bearing becomes to make them to have curved section and groove with bearing pop-up structure, in this form, one is individual against another placement, and one is rotated in another, the centering for this element of construction on the spin axis of this rotor.

17. pumps as claimed in claim 15, wherein this frictional bearing on this cod is with the bending away from this impeller of recessed mode, and this bearing projection is with the bending away from this impeller of protruding mode.

18. pumps as described in claim 15 or 17, wherein this of frictional bearing or bearing projection curve inwardly that portion is more adjacent than another, the bending of bent outward pars convoluta still less.

19. pumps as claimed in claim 14, wherein a part for this cod comprises plastic materials.

20. pumps as claimed in claim 14, wherein a part for this cod comprises metal.

21. pumps as described in claim 14 or 17, wherein at least this aduncate frictional bearing comprises plastic materials.

22. pumps as claimed in claim 14, wherein this frictional bearing injection-molded is on pump case or in pump case.

23. pumps as claimed in claim 15, this bearing projection injection-molded wherein combining with this frictional bearing is on this impeller or in this impeller.

24. pumps as claimed in claim 1, wherein this element of construction rotates on fixing motor axostylus axostyle, and it faces with the back away from this impeller ground and is firmly fixed on end.

25. pumps as claimed in claim 24, wherein this fixing motor axostylus axostyle fixedly secures in motor body or is fixed to motor body, and wherein spindle socket is arranged in the rotor rotating on motor axostylus axostyle.