CN1711424A

CN1711424A - Electrically driven pump

Info

Publication number: CN1711424A
Application number: CNA2003801029007A
Authority: CN
Inventors: M·卡拉夫斯基
Original assignee: BSH Bosch und Siemens Hausgeraete GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 2002-11-05
Filing date: 2003-10-31
Publication date: 2005-12-21
Anticipated expiration: 2023-10-31
Also published as: WO2004044433A1; DE10251463A1; CN100400892C; US20050260088A1; EP1567772A1

Abstract

The invention relates to a pump comprising a pump chamber containing an impeller (15) and a rotor (21, 22) of an electrical machine, said rotor being connected to the impeller. A flow path (20) extends from the inlet (6) to the outlet (14) of the pump chamber through a central passage of the rotor (21, 22).

Description

Electrically driven (operated) pump

The present invention relates to a kind of electrically driven (operated) pump, this pump is furnished with an impeller that rotates in a pump chamber.This class pump purposes is very wide, and every liquid must lean on little back-pressure and the place of moving all be can use, as is used for the turn of dishwasher or washing machine wash water, as the cooling waterpump on the internal-combustion engine, and as the bilge pump on the ship, or the like.

The pump that great majority are used for liquid all has a kind of two-part structure, be furnished with a motor that is used to drive an axle with one along this vertically link to each other with motor by this shaft-driven pump head.A kind of like this device causes a kind of structure of extending along the direction lengthwise of axle of pump, and this structure can not be applicable to all assembling situations of the equipment that can use this pump well.Therefore, for example in a dishwasher, the pump that is used for wash water circulation generally all is placed in the below of developing room.The pump structure height should be low as much as possible, so that non-unnecessarily being limited in is scheduled to accessible developing room height under the dishwasher outer cover height condition.This just forces equipped the sort of traditional pump: this pump has the structural type according to axial elongation, is furnished with the axle of horizontal alignment.This pump structure height has only in the following cases and just can reduce, and be exactly the diameter that must reduce each rotating part of pump earlier, but this can influence its efficient again.

Another shortcoming of traditional aufbauprinciple is: the axle that leads to pump head must be sealed reliably, is not subjected to from the obstruction of the liquid of pump head effusion so as to the protection motor.

In order to solve the problem of sealing, rotor to motor cools off simultaneously, propose following suggestion in DE 19,903 817 A1: the impeller of the cooling waterpump that automobile is used is made with a kind of magnetic material at least in part, and it is used as the rotor of a motor that drives this impeller simultaneously.This pump does not no doubt have running shaft and can realize that the rotation between motor and the pump head cooperates, but it still can not make the structure length vertically of pump shorten.Or rather, must use a kind of impeller that extends vertically extraordinaryly, this impeller can be divided into two sections with regard to it with regard to the function axially, that is: one first section, it extend into of pump chamber dearly by in the part that stator surrounded of motor, in this it in this place is placed in the field of stator, thereby work as rotor, but in fact do not bring into play the effect of pump purt; One second section, it is grasped by the place of stator hardly, but it is in the inlet opening of pump chamber and the height of delivery outlet for this reason, thus bring into play the effect of pump purt in fact specially.The aufbauprinciple that preamble is addressed, according to this, motor and pump head be in side by side each other axle vertically in, this principle is also followed on above-mentioned traditional pump.

Task of the present invention provides a kind of so electrically driven (operated) pump, this pump is compared with traditional pump has following advantage: under identical pump efficiency condition, structure length in having shortened axially, thereby can be suitable for the assembly condition on some equipment better, and can utilize the space better than traditional impeller pump.

Above-mentioned task is to solve by a kind of pump with feature described in the claim 1.For this reason, set a kind of center channel of rotor, by this path flow path is decided to be from the inlet opening of the pump chamber of pump to the delivery outlet of pump chamber, thereby can therefore can reduces the pump structure length in axially in the function that on the equal height of the axle of pump, realizes pump head and electric driver.

On the wheeled pump of the overwhelming majority's conventional leaf, impeller all has a wheel hub, and blade stretches out from this wheel hub, and the free end of blade is along the fixing casing wall rotation of pump.On the pump that proposes according to the present invention, flow path is not subjected to the restriction of above-mentioned casing wall, but is subjected to the restriction as the wheel rim of an impeller part, and links to each other with its wheel hub through blade.This wheel rim is carrying the rotor of motor.

Described motor preferably belongs to the direct current motor by the type, particularly a kind of brushless of at least one permanent magnet excitation.Described at least one permanent magnet of this motor is preferably integrally surrounded by wheel rim, so as to protect it not with will be contacted by the liquid of pump purt.For this purpose, wheel rim or preferably whole impeller can be by being made the cast of permanent magnet with a kind of plastics.

A stator of motor is preferably according to the outside of radial arrangement at rotor.Pump chamber wall preferably extends through formed gap between stator and rotor so.

In order to simplify the assembling of pump, the shell of pump preferably is made of a first portion and a second portion, and wherein first portion comprises: a tubular section can refer specifically to the wall that extends through formed gap between stator and rotor here; Convex shoulder on one first termination inwardly, that be formed in this tubular section of a qualification inlet opening; And the convex shoulder on one second termination outwardly, that be formed in the tubular section, second portion then forms one can be installed in second lid on the convex shoulder.So, impeller can easily be pushed into the tubular section of first housing parts from second termination, and is closed within it by the installation of lid, and meanwhile stator can be pushed open from first side of tubular section.

The socket that each end of an axle of impeller is used preferably is formed in shell two-part each.

In fact, impeller directly links to each other with rotor on the pump that the present invention proposes, and the two is rotatably installed on the fixing axle thereby permission is with this.

For the frictionless that obtains impeller suspends, preferably impeller is bearing on the axle through at least one oil ring bearing.Such oil ring bearing preferably links to each other with impeller regularly, and can be around this fixing axle rotation.Like this, impeller itself does not just suffer direct Friction load, therefore can with a kind of inexpensive, have the very made of friction load-bearing ability, and can not have influence on the working life of pump.

On the internal surface of oil ring bearing, preferably dispose at least one axial passage.Liquid by pump institute pump purt can penetrate in this passage.Make this bearing obtain cooling so on the one hand, can between the internal surface of oil ring bearing and described axle, form the liquid rete that can reduce to rub on the other hand.

Oil ring bearing preferably has two sections that various outer diameter is arranged, less one first section of its external diameter is embedded in the center hole of impeller, second section outside that then is in this center hole that external diameter is bigger, thus a backstop formed, and this backstop is determined the axial position of oil ring bearing on impeller.

In order to reach the purpose of stable guiding, preferably two oil ring bearings are incorporated into the center hole of impeller from opposed two ends.These two oil ring bearings are preferably identical.

The pump that proposes according to the present invention is particularly suitable for being installed in as on the sort of equipment with vertical orientation impeller axis of dishwasher.In this way, one that this pump only need be below developing room helps developing room and keeps that a very little height is arranged in the alap assembly space.The pump that the present invention proposes is compared its diameter with the traditional pump with same efficiency and is increased to some extent, but what problem the diameter that increases can not cause in general in the assembly space of such one size with little vertical but big side direction.

If the pump of the axis be furnished with vertical orientation is installed, suitable also is: arrange the inlet opening to such an extent that be higher than delivery outlet.In service at a kind of like this pump, its impeller promptly is in by under one of the medium of the pump purt pressure that works along the inlet opening direction, therefore, under the inlet opening situation that occupy a high position, the axial force that acts on the bearing of impeller is because above-mentioned pressure is because the weight of impeller causes on the other hand on the one hand, these power can compensate each other at least in part, thereby cause a very little bearing load.

Not frayed for the socket of protecting that when impeller rotates, to be subjected to axially to load, be preferably on the end of axle and settle a pad antitorquely, this pad is between socket and its adjacent rotating part under the situation of mounted axle.When the power that makes pump with abundance turns round, can following situation be starting point then: the pressure that works along the inlet opening direction surmounts the gravity of impeller, and, so the axle head that it on be mounted with pad preferably that end of inlet opening one side of axle irrelevant with rigging position.

Other features and advantages of the present invention are seen with reference to the accompanying drawings with regard to an explanation that embodiment did.Accompanying drawing is represented:

The axial sectional view of a kind of pump that Fig. 1 the present invention proposes,

The exploded view of the various piece of Fig. 2 pump,

The perspective elevation of the axle of Fig. 3 pump,

The perspective elevation of the oil ring bearing of Fig. 4 pump.

The shell of pump is made up of two parts 1,2, and these two parts for example adopt pressure injection-moulded method to be shaped with the plastic monoblock formula.First housing parts 1 has a tubular section 3, and a convex shoulder 4 or a convex shoulder 5 that extends according to radial outward that extends according to radial inward at the axis of tubular section 3 has been shaped on its two ends.The convex shoulder 4 that extends inwardly limits an inlet opening 6 of pump.At the center of this inlet opening 6 socket 7 that is used for axle 18 that is kept by supporting element 8 is arranged, this supporting element couples together socket 7 inwardly with the convex shoulder 4 that points to.

On a side of the section of tubular dorsad 3 of the convex shoulder 5 that is outwardly directed to, be shaped one with axle with one heart around rib 9.This rib 9 has one and bends to the internal surface of quadrant and the outer surface of a tubular equably, and a cylindrical outer wall 10 of second housing parts 2 just is enclosed within on this cylindrical outside surfaces.Opposed end for axle 18 on the flat bottom of housing parts 2 has disposed one second socket 13.The bottom 11 and outer wall 10 by one around groove 13 and be joined to one another, the free transverse section of this groove reaches maximum at a height from the discharge connection 14 of groove 13s respectively, then reduces gradually equably along both direction from the point of this towards a diametrically contraposition of groove 13.

Bottom 11, tubular section 3 and inside convex shoulder 4 limit the pump chamber of a tubular, and an impeller 15 can remain in this pump chamber rotatably around axle 18.Impeller 15 is known to have a wheel hub 16, this wheel hub is hyperboloid of revolution shape or taper shape, its angle of release is towards Jiao Ding, promptly constantly narrow towards the inlet opening, and this wheel hub is also carrying several blades 17, and these blades stretch on each comfortable plane by the vertical axis extension of pump.Wheel hub 16 has an axial bore, and the diameter in this hole is greater than passing diameter this hole extension, that be maintained at the axle 18 in the socket 7,12.

Among Fig. 3 with perspective representation axle 18.This has a shape of cylindrical metal bar basically, is furnished with leveling place 25 of parallel axes on its two ends, and these two levelings place give the transverse section of the non-circle in two ends respectively.Socket 7,12 complementally is shaped with the transverse section of this non-circle separately, makes axle 18 be maintained in the pump casing antitorquely.Loose ground is pushed to a metallic shim 28 on one of described end of axle 18.This metallic shim has a center hole, and this center hole has a kind of shape of end complementation of and axle 18 leveling, makes this metallic shim to pass through the axial expansion portion of leveling place 25, but non-rotatable.

Impeller 15 utilizes two identical oil ring bearings 27 and remains on the axle 18, and one of them bearing is shown among Fig. 4 with perspective view.Oil ring bearing 27 is the metal all-in-one-piece sleeves of usefulness.This bearing is according to axially there being two

sections

29,30 in succession, and these two sections are through a convex shoulder (among Fig. 4 observer) dorsad and coupling together radially.The external diameter of narrower section is so to determine size to make this section can be pressed in the axial bore of wheel hub 16, and second section is as shown in FIG. 2 then according to axially exceeding wheel hub 16.The internal diameter of a center hole of oil ring bearing 27 is slightly larger than axle 18 external diameter, and wherein size is so determined in the clearance between these two, makes can form one by the rete that will be constituted by the liquid of pump purt when pump turns round between these two.Liquid penetrates into oil ring bearing 27 and axle is facilitated by two radial slot cracks 31 between 18, and these two groove cracks are formed on section 30 distolateral, and are passed into a passage 32 respectively, and this passage is according to axially extending on the internal surface 33 of described center hole.

The blade 17 of impeller 15 is carrying a wheel rim 19, this wheel rim is with in addition crooked as the surperficial similar manner of wheel hub 16, and limit a flow path 20 with this wheel hub, this flow path is from the inlet opening 6, at first according to axially extending down, so that constantly change over to radially then, follow its circumferential surface from impeller 15 at last and come out and reach groove 12.

Wheel rim 19 on a side of inlet opening 6 (at this flow path 20 as yet not according to radial separation) have a permanent magnet 21 and a laminated core 22 to be embedded in this wheel rim.Magnet 21 and laminated core 22 form a ring, and flow path 20 passes this ring and extends.Around this be periphery put one the circle electromagnet 23.Permanent magnet 21 and electromagnet 23 form the rotor or the stator of direct current motor a kind of brushless, electronic rectifier.The tubular section 3 of first housing parts extends through an air clearance between permanent magnet and the electromagnet, this section only has several thickness of several branches of one one millimeter on the height of described magnet, by a layer that comprises permanent magnet 21 that also has thin wheel rim 19 of this space extension.

The liquid that is flow through pump around the wheel rim 19 surrounds.Because being the materials with wheel rim 19, permanent magnet 21 and laminated core 22 sealed spray, so they are subjected to exempting the protection of liquid.Electromagnet 23 is opened with liquor separation by the all-in-one-piece closely knit wall of first housing parts 1.Do not have a kind of chicane, this passage imprecision that in running, may become, thereby make will by the liquid of pump purt be seeped into pump will be diversed part in go.Required seal point only is on the pump that proposes according to the present invention: the seal point between described two housing parts 1,2, these seal points for example can be realized by methods such as bonding, ultrasonic welding; Seal point between a connecting head of first housing parts 1 and a delivery conduit can be realized by the elastomeric seal circle 24 in the groove that is embedded in housing parts 1 here; And at the seal point of taking between 14 and connections (not shown) conduit thereon.Every part that will be sealed on these seal points is all can not be toward each other movable, and this just is expected to obtain good sealing when long.

Claims

1. the pump of being furnished with a pump chamber, this pump chamber has an inlet opening (6) and a delivery outlet (14), in this pump chamber, settled a rotor (21 that links to each other with this impeller of an impeller (15) and a motor, 22), it is characterized in that, extend through a center channel of rotor (21,22) to a flow path (20) of delivery outlet from the inlet opening of pump chamber.

2. by the described pump of claim 1, it is characterized in that impeller (15) has a wheel hub (16), blade (17) and a wheel rim (19) that links to each other with wheel hub (16) by this blade (17); Described rotor (21,22) is positioned on this wheel rim (19).

3. by the described pump of claim 2, it is characterized in that wheel rim (19) has one along the internal surface through-flow direction expansion, that limit flow path (20).

4. by claim 2 or 3 described pumps, it is characterized in that rotor (21,22) has at least one permanent magnet (21).

5. by the described pump of claim 4, it is characterized in that permanent magnet (21) is integrally surrounded by wheel rim (19).

6. by each described pump in the above claim, it is characterized in that a stator (23) of motor is according to the outside that radially is placed in rotor (21,22).

7. by the described pump of claim 6, it is characterized in that a wall (3) of described pump chamber extends through a space that is formed between stator (23) and the rotor (21,22).

8. by each described pump in the above claim, it is characterized in that a shell of described pump is made of one first and one second portion (1,2), wherein first portion (1) comprises: a tubular section (3); One limit inlet opening (6), the convex shoulder inwardly (4) on a first end of tubular section (3); A convex shoulder (5) outwardly on a second end of tubular section, second portion (2) forms the lid that can be installed on second convex shoulder (5).

9. by the described pump of claim 8, it is characterized in that each in described two parts (1,2) all has a socket (7,12), be respectively applied for an end of an axle (18) of impeller (15).

10. particularly by each described, as to be furnished with pump chamber pump in the above claim, this pump chamber has an inlet opening (6) and a delivery outlet (14), in pump chamber, settled a rotor (21 that links to each other with impeller of an impeller (15) and a motor, 22), it is characterized in that, rotor (21,22) and impeller (15) can be installed rotatably around a fixing axle (18).

11., it is characterized in that impeller (15) is supported on the axle (18) through at least one oil ring bearing (27) by the described pump of claim 11; Oil ring bearing (27) rotates with impeller (15).

12., it is characterized in that described oil ring bearing (27) has at least one axial groove (32) on the surface (33) within it by the described pump of claim 11.

13. by claim 11 or 12 described pumps, it is characterized in that, oil ring bearing (27) has first section (29) and second section (30) that is in this center hole outside in the center hole that is embedded into impeller (15), and the external diameter of described second section is greater than the external diameter of first section (29).

14. by each described pump in the claim 11 to 13, it is characterized in that, two oil ring bearings (27) be incorporated into the center hole of impeller (15) from opposite two ends.

15. by each described pump in the claim 10 to 14, it is characterized in that, on an input side of axle (18), settle a pad (28) antitorquely.

16., it is characterized in that the spin axis of impeller (15) vertically is oriented in the rigging position of pump by each described pump in the above claim.

17., it is characterized in that inlet opening (6) are arranged to such an extent that be higher than delivery outlet (14) by the described pump of claim 16.

18. housed device, particularly dishwasher is characterized in that by each described pump in the above claim.