EP3008346A1

EP3008346A1 - Pump

Info

Publication number: EP3008346A1
Application number: EP14704602.3A
Authority: EP
Inventors: Volker Block; Uwe Kögel; Stefanie Roth; Tobias Albert
Original assignee: EGO Elektro Geratebau GmbH
Current assignee: EGO Elektro Geratebau GmbH
Priority date: 2013-06-14
Filing date: 2014-02-17
Publication date: 2016-04-20
Anticipated expiration: 2034-02-17
Also published as: ES2709903T3; SI3008346T1; US20160169230A1; CN105473868B; US10260505B2; DE102013211180A1; WO2014198427A1; JP6357534B2; JP2016521825A; CN105473868A; PL3008346T3; EP3008346B1; TR201820521T4

Abstract

A pump for delivering fluid has a pump housing and, in the latter, a pump chamber with pump chamber cover and pump chamber base, an inlet and an outlet. In the pump chamber, an impeller rotates on a rotor shaft which is connected to a drive motor. The inlet is arranged in the pump chamber cover and the outlet is arranged, below the rotor or impeller in the axial direction of the pump, at that end region of the pump chamber which is remote from the inlet, and close to the outlet. The distance from the inlet to the outlet with the impeller in between may correspond approximately to the diameter of the pump chamber.

Description

pump

Field of application and state of the art

The invention relates to a pump for conveying fluid, in particular as an impeller pump or radial pump, as it can be used for example in a water-conducting device or household appliance such as a dishwasher or a washing machine.

From EP 2150165 B1 a corresponding pump is basically known. It has a pump housing with a pump chamber and inlet and outlet, which are arranged on a cover of the pump housing. Just above a bottom of the pump chamber, an impeller is arranged, which sits on a rotor shaft of the drive motor, which is arranged below the bottom. An outer wall of the pump chamber is heated and the fluid flowing therealong is heated.

Task and solution

The invention has for its object to provide an aforementioned pump, can be solved with the problems of the prior art and in particular it is possible to build a pump easy and usable and space to arrange in a device or household appliance.

This object is achieved by a pump having the features of claim 1. Advantageous and preferred embodiments of the invention are the subject of the other claims and are explained in more detail below. The wording of the claims is incorporated herein by express reference.

It is envisaged that the pump has a pump housing, a pump chamber in the pump housing and an inlet and an outlet on the pump chamber. Furthermore, an impeller or an impeller is provided in the pump chamber, which can basically be formed in a known manner. The impeller is arranged on a drive shaft or rotor shaft and thus connected to a drive motor of the pump, in particular with its rotor. The pump chamber has a pump chamber cover and a pump chamber bottom, wherein these two terms are to be understood broadly and substantially effect or represent a conclusion or delimitation of the pump chamber in the axial direction or represent. But you do not have to form the whole degree. In the pump chamber Cover the inlet is arranged, preferably centrally or axially and centrally to a longitudinal central axis of the pump. Advantageously, the drive motor can be arranged under the pump chamber bottom or at least under a central region of a pump chamber bottom, ie adjacent to the pump chamber bottom in the axial direction and away from the pump chamber cover or away from the inlet.

According to the invention, it is provided that the outlet from the pump chamber is arranged in the axial direction of the pump below the impeller or impeller, preferably therefore at the end region of the pump chamber near the outlet, which is remote from the inlet in the axial direction. In the aforementioned prior art in the form of EP 2150165 B1 inlet and outlet are arranged together in the pump chamber lid. The impeller runs over the bottom of the pump chamber. Thus, in the prior art, the inlet and outlet are approximately at the same axial height, away from the impeller, or else the outlet may be remote from the impeller in the axial direction beyond the inlet.

With the invention, so to speak, the outlet is displaced in the axial direction, advantageously the pump chamber, so to speak with him. In this case, the outlet is displaced in the axial direction away from the pump chamber cover or away from the inlet, particularly advantageously away from the impeller, but just in the opposite axial direction from the inlet. Thus, the pump chamber may preferably also extend annularly in the axial direction of the pump from the impeller, in a direction away from the inlet and advantageously in a direction in which the fluid to be delivered flows into the pump chamber in the inlet.

In an advantageous embodiment of the invention, a heating device for the pumped by the pump fluid is provided. This heating device can be integrated into the pump chamber, so that it is directly flown by the fluid conveyed or in the pump chamber. A heating device may advantageously be designed to be circular in shape. In this case, they can form a pump chamber outer wall, since a particularly good flow with particularly good heat transfer is ensured here in a radial pump by the circulation movement of the funded fluid.

The impeller may advantageously be arranged just below the pump chamber lid. Thus, it can also be arranged just below the inlet. Advantageously, no region of the pump chamber projects beyond the impeller in the axial direction towards the inlet. Thus, the pump chamber cover actually covers substantially the end face of the pump chamber and also the entire end face of the pump chamber in the axial direction to the inlet. In the case of the initially mentioned prior art, this is the case for the pump chamber bottom.

In an advantageous embodiment of the invention, the pump chamber may extend from the pump chamber cover in the axial direction away from the inlet, advantageously substantially annularly circulating. As viewed in the axial direction, a pump chamber length may be 0.5 times to 1.5 times or even 2.5 times the largest diameter of the pump chamber. Preferably, the maximum axial extent of the pump chamber length is approximately as large as the largest diameter. According to another possibility, the pump chamber length along the axial direction may be 2 to 5 times the axial length of the impeller. This also means that the pump chamber has a certain axial length. This is also needed so that the aforementioned heater can have a certain axial length and the pumped fluid can travel a certain distance along it for heating.

In an embodiment of the invention, the impeller can be arranged over a front end face of a projecting into the pump chamber projection or cylinder paragraph or paragraph. This shoulder projects from an end of the pump remote from the pump chamber cover in the axial direction into the pump chamber and forms an inner wall of the pump chamber, in particular in a section in the axial direction following the impeller. This shoulder can be integrally connected to at least a part of the pump chamber outer wall, in particular it can form a pump chamber inner wall and then turn around in a reversal area and, as it were, form part of the pump chamber outer wall, in particular close to the outlet. The heel may have a diameter similar to the diameter of the impeller, advantageously between 0.5 and 1.5 times the diameter of the impeller or its lower cover disk. The aforementioned rotor shaft, on which the impeller is seated and which is connected to the drive motor of the pump or forms part of it, may be guided by the aforementioned paragraph. The heel may contain at least a portion of the drive motor of the pump. For example, a rotor of the drive motor seated on the rotor shaft can run therein. Under certain circumstances, a larger functional part of the drive motor in the paragraph run, preferably also radially within the outlet or radially within an outlet. Alternatively and preferably, the drive motor can be arranged with its functional parts in the axial direction behind the outlet or outlet nozzle of the pump chamber. The pump housing may be formed in three parts in the embodiment of the invention. For this purpose, it may be formed by the pump chamber cover, a radially outer pump chamber wall, which is advantageously formed by an aforementioned heating means, and the aforementioned cylinder shoulder. The cylinder shoulder can preferably be pulled up below the outlet and radially outwards and bent over in the direction of the inlet to reach the radially outer pump chamber wall. This rather complicated shape is easy to realize with a plastic injection molded part.

At the cylinder shoulder near the front end face or at a free end of the cylinder shoulder over which the impeller is arranged or over which it runs at a small distance, a stator with at least one extending along the outside of the stator vane can be provided. In this case, the guide vane is outwardly, advantageously approximately or substantially in the radial direction, and extends along at least part of the circumferential direction along the outside along. It has a pitch in comparison to a longitudinal axis through the rotor shaft, advantageously 5 ° to 30 °, particularly advantageously 8 ° to 20 °. The guide vanes are preferably always equidistant from the outside of the stator or the lid. But this can also be varying.

On the substantially hollow cylinder shoulder, a cover can preferably be placed, wherein the outside of the cover on the outside of the at least one guide vane is arranged or formed. Advantageously, the cover has a passage and / or a bearing for the rotor shaft in the middle region. The impeller may be located a short distance above the lid, for example at a distance of less than 5 mm.

The cover, in particular with the stator, may have a bearing support for a bearing of the rotor shaft. This can advantageously be a bearing for a bearing bush for the rotor shaft. Advantageously, the cover or the stator are formed decentrally to a longitudinal center axis through the rotor shaft or decentered to an outer wall of the pump chamber. Particularly advantageous they are as decentralized as the cylinder shoulder.

In a further embodiment of the invention, a conveying direction of the fluid conveyed in the pump can run within the pump housing or within the pump in such a way that it is mono-toned in one direction or has at least one axial component that extends monotonically in one direction. Thus, the fluid never runs counter to the inflow direction through the inlet into the pump chamber. This conveying direction in the pump can even always a have axial component along the axial direction or parallel to the inflow direction, so run strictly monotonous. This should then apply until the pumped fluid leaves the pump chamber at the outlet. In this case, the pumped fluid in the impeller also have an axial component of motion, which is always greater than zero. The impeller is then a so-called Halbaxialimpeller or the pump is a Halbaxialpumpe.

Alternatively and advantageously, the impeller may be designed as a pure radial impeller and thus the pump as a pure radial pump. A pure radial impeller is more efficient. The axial flow or axial component can be achieved in purely radial design by the shape of the pump chamber cover and the displacement of the water in the continuous conveying process. This can then be achieved as good as possible conveying effect for the fluid in the pump.

These and other features are apparent from the claims and from the description and drawings, wherein the individual features each alone or more in the form of sub-combination in one embodiment of the invention and in other areas be realized and advantageous and for can represent protectable versions for which protection is claimed here. The subdivision of the application into individual sections as well as intermediate headings does not restrict the general validity of the statements made thereunder.

Brief description of the drawings

Embodiments of the invention are shown schematically in the drawings and explained in more detail below. In the drawings show:

1 is an oblique view of a pump according to the invention,

2 is an oblique sectional view of the pump of Fig. 1,

Fig. 4 is a modification of the pump in a view similar to Fig. 3 with drawn in the direction of the inlet drive motor and

Fig. 5 shows a modification of the pump of Fig. 4 with stator. Detailed description of the embodiments

In Fig. 1, an inventive pump 1 1 is shown in an oblique view with a pump housing 12, which is one of the sectional views of the Flg. 2 and 3 better to see pump chamber 13 has. The pump 1 1 has in a pump chamber cover 15 an inlet nozzle 16 and below an impeller 25. Furthermore, an outlet 22 from the pump chamber 13 with an outlet 23 is provided in the general conveying direction F of the conveyed fluid. This outlet 22 or outlet pipe 23 is arranged in the axial direction clearly far away from the pump chamber lid 15 and the inlet pipe 16. In particular, when the axial extent along the longitudinal central axis of the pump 11 shown in FIG. 3 is considered, it is provided at the other axial end of the pump chamber 13 as the inlet port 16 and the impeller 25.

FIG. 1 also shows the outside of a heating device 18 with strip-shaped heating conductor tracks 18 ', as is known from the initially mentioned EP 2150165 B1. It can, so to speak, be exposed to the outside, alternatively, it can also be thermally insulated as a safety measure and to reduce waste heat of the pump 1 1 to the outside and to increase the heat efficiency of the pump. At the top of the pump housing 12, a connection plug 19 for the pump 11 is provided in the vicinity of the outlet connection 23.

After in nen the pump chamber 1 3 is bounded by a circumferential inner wall 20. This Innenwandu ng 20 is non-concentric and causes a varying in the direction of rotation of the pump chamber 1 3 width or varying cross-sectional area. This is known, for example, from the German patent application DE 1 0201 221 0554.9 with the filing date of July 22, 201 2 of the same Applicant.

The impeller 25 is arranged above a cover 27 which, with respect to the pump chamber 1 3, forms a type of pump chamber or at least its central area. At the same time he closes the right of it in the pu chamber 1 3 3 formed additional chamber chamber 29 as the aforementioned cylinder paragraph, which contains an addi tional fluid volume 30. To the right, the additional chamber 29 is closed and thus dense, forming a bearing 32b for a Rctorwelle 35. For this purpose, the bearing 32b or the right-hand bottom of the additional chamber 29 is designed as a kind of end shield with a recess and a right bearing bush 33b therein.

Left is in the cover 27, a left Lageru ng 32 a formed in which a bearing bush 33 a in the lid 27 and Lageru ng 32 a is held. The bearing bush 33a forms a radial bearing for the rotor shaft 35. At the same time, an axial bearing ring 37 is still arranged or pressed against the rotor shaft 35. It is attached to the bearing bushing 33a with its longitudinal end and also forms a thrust bearing of the rotor shaft 35 to the left or in the direction of the inlet port 1. 6. On the rotor shaft 35, a holding body 39 is fixed, which is turned right into a rotor 40 of a rotor Drive motor 43 for the pump 1 1 passes. Outside the auxiliary chamber 29, a stator 42 of the drive motor 43 is provided around the rotor 40. On the holding body 39 and thus on the rotor shaft 35, an impeller 46 is arranged with wings n, as it is known for screws or propellers per se. In the additional chamber 29 or as additional fluid volume 30, the same fluid is provided, which is funded by the pump 1 1. For this purpose, the lid 27 has a plurality of passages 28. These cause the additional chamber 29 is filled with the fluid. The impeller 46 should overall be designed so that it, as described above, at Nen nbetrieb the pump 1 1 within the fluid volume 30 such a force along the dash-dotted longitudinal center axis of Pum pe 1 1 and along the rotor shaft 35 to the right generates, which balances the corresponding force of the impeller 25, which is directed exactly opposite to the left. The remaining axial force to the left can be absorbed by the thrust bearing with bearing bushing 33a and thrust bearing ring 37. From Fig. 3 is also good to see how the fluid along a fluid path F first passes through the inlet port 16 into the pump 1 1 into it, first into the impeller 25 inside. From this it is then applied with a predominant radial component, which is due to the shape of the impeller 25 can be seen that a, albeit small, but not negligible axial component is still given and that just in the previous axial direction. So it is a so-called Halbaxialimpeller or the pump 1 1 is a Halbaxialpumpe. Maintaining the axial movement component of the delivered fluid after discharge from the impeller 25 may be assisted by the shape of the pump chamber cover 15 on the inside in addition to the shape of the impeller 25. Alternatively and advantageously, the impeller may be designed as a pure radial impeller and thus the pump as a pure radial pump. A pure radial impeller is expected to be more efficient. The axial flow or axial component can be achieved in the purely radial design by the shape of the pump chamber lid and the displacement of the water in the continuous conveying process. In the annular pump chamber 13, the pumped fluid overflows several times, for example, three times to eight times, but it moves steadily along the axial direction to the right, thus still has an axial component of movement. Finally, the circulating and axially conveyed fluid enters the outlet 22 along the fluid path F and is brought out of the pump chamber 13 and the pump 11, respectively, from the outlet port 23. In this area, the pumped fluid in the illustrated embodiment, no axial movement component more. However, this need not be so, because due to the oblique slope to be recognized at the outlet 22 such is still given to shortly before the outlet 23. Thus, the outlet port 23 could also maintain this oblique direction. From Fig. 3 it can also be seen that, according to another generally valid definition of the invention, the outlet 22 and the outlet port 23 between the impeller 25 and at least one stator 42 of the drive motor 43 of the pump 1 1 is arranged. Since the functional part of the rotor 40 of the drive motor 43 has approximately the axial extent of the stator 42, the outlet 22 or the outlet connection 23 is arranged in the axial direction between the impeller 25 on the one hand and the functional part of the drive motor 43 on the other hand.

An alternative embodiment of the invention is shown in FIG. Here, a pump 1 1 1 with a pump housing 1 12 has a structure which is similar in relation to the pure pump function, with a pump chamber 1 13 which is closed to the left by a pump chamber cover 15. In the pump chamber lid 1 15, an inlet port 1 16 is arranged or molded. In the circumferential direction, the pump chamber 1 13 is limited or formed by an annular heater 1 18 according to the first embodiment. An inner wall 120 bounds the pump chamber 1 13 radially inwardly.

The inlet port 1 16 leads exactly to an I mpeller 125, which is mounted on a rotor shaft 135 of a drive motor 143. The rotor shaft 135 and the drive motor 143 are arranged on the dashed longitudinal center axis of the pump 1 1 1. Here, the drive motor 143 is shown purely schematically and protrudes further into the pump or extends until just before a bottom of the impeller 125th

It can also be seen how the pump chamber 1 13 merges in the axial direction to the right into an outlet 122 with an outlet connection 123. This corresponds to the first embodiment. Thus, it can also be seen here that due to the arrangement of the drive motor 143 to just below the impeller 125, the outlet 122 or the outlet connection 123 is no longer arranged between the impeller and the drive motor but rather is located here at the axial height. he drive motor 143 is located, approximately in the middle of this. Even so, a good construction and especially a compact design is achieved.

Furthermore, the drive motor 143 could even be considerably shorter in the axial direction, so that, for example, it barely protrudes from the pump chamber 1 13 or from the pump housing 1 12. Then, according to another general idea of the present invention, it would be possible for a drive motor of the pump to be located closer to the impeller in the axial direction, in particular with a substantial part of its axial longitudinal extent, as an outlet or outlet port of the pump housing.

In Fig. 5 is shown in a modification of the pump 1 1 1 of FIG. 4, wherein here on the cylinder shoulder 121, which simultaneously forms the aforementioned inner wall 120, at the left-facing free end, a separate cover 127 'is arranged, the covers or closes the cavity in the cylinder shoulder 121. In principle, this cover 127 'corresponds to the lid 27 shown in, for example, FIG. 3, except that it is not inserted into the front end opening but covers the entire cylinder shoulder 121 and is set from the front. In it, the passages 128 'are formed.

On the outside of the cover 127 ', guide vanes 145 are arranged, which project outwardly or into the pump chamber 13. The vanes 145 are integrally formed on the lid 127 '. However, they could also be placed outside in the manner of a ring. It is advantageous four guide vanes 145 which extend in the circumferential direction each over a tight quarter circle and have a slope whose height is slightly less than the height of the lid 127 'in the axial length. Also, a different number of vanes is generally and advantageously possible, for example, 2 to 6 or even 10. As illustrated herein, the vanes 145 may be slightly curved away from the inlet 16 to provide the best possible effect to have for the pumped fluid in the pump chamber 1 13. But this need not be, they can also stand out at right angles or point in the opposite direction.

Furthermore, it can still be seen from FIG. 5 that the cover 127 'extends exactly in the extension of the shoulder 120, is quasi mounted on it in the front, and the guide vanes 145 protrude laterally from the cover 127' at a constant height. Thus, although they are in principle formed equal to each other, but have to the heater 1 18 as the outer wall of the pump chamber 1 13 each have a different distance. Thus, they are not concentric with the dash-dotted longitudinal center axis of the pump 1 1 1. This simplifies the structure and may be desired fluidically. Alternatively, it is also possible at a decentered as arranged here arranged shoulder 121 with decentered provided inner wall 120, the guide vanes 145 each having the same distance to the heater 1 18 as outer wall form, for example, 1 mm to 5 mm or even 10 mm under certain circumstances. The cover 127 'also has the bearing 132a with the left bearing bushing 133a, as is the case with FIG. 4.

Claims

Patent claims

Pump for conveying fluid, in particular an impeller pump or radial pump, with a pump housing

a pump chamber in the pump housing

an inlet into the pump chamber and an outlet from the pump chamber, an impeller or impeller in the pump chamber, the impeller being arranged on a rotor shaft and being connected to a drive motor of the pump, a pump chamber cover and a pump chamber base, the inlet being in the pump chamber cover is arranged,

characterized in that the outlet is arranged in the axial direction of the pump below the impeller or impeller at the end region of the pump chamber remote from the inlet.

Pump according to claim 1, characterized by a heating device for fluid conveyed by the pump, wherein in particular the heating device is integrated into the pump chamber and is preferably designed in a circular ring shape and in particular forms a pump chamber outer wall.

Pump according to claim 1 or 2, characterized in that the impeller is arranged just below the pump chamber cover, with preferably no area of the pump chamber projecting beyond the impeller in the axial direction towards the inlet.

Pump according to one of the preceding claims, characterized in that the pump chamber extends from the pump chamber cover in the axial direction away from the inlet in a circular ring-like manner with a pump chamber length along the axial direction which is 0.5 times to 1.

5 times the largest diameter of the pump chamber or which is 2 times to 5 times the axial length of the impeller.

Pump according to one of the preceding claims, characterized in that the impeller is arranged above an end face of a projection or cylinder shoulder projecting into the pump chamber, which projects into the pump chamber in the axial direction from an end of the pump remote from the pump chamber cover and has an inner wall the pump chamber forms, whereby the Cylinder shoulder is connected in one piece to at least part of the part forming the pump chamber outer wall.

6. Pump according to claim 5, characterized in that the rotor shaft leads through the cylinder shoulder and the cylinder shoulder, in particular in an axial extension away from the inlet into the pump chamber, contains at least part of the drive motor, preferably a rotor of the drive motor seated on the rotor shaft.

7. Pump according to claim 5 or 6, characterized in that the pump housing is in three parts and is formed by the pump chamber cover, a radially outer pump chamber wall or the corresponding heating device and the cylinder shoulder, preferably the cylinder shoulder below the outlet and radially outwards is pulled up towards the inlet up to the radially outer pump chamber wall.

8. Pump according to one of claims 5 to 7, characterized in that on the cylinder shoulder near the front end surface or at a free end of the cylinder shoulder, above which the impeller is arranged, a stator with at least one running along the outside of the stator Guide vane is provided, the guide blade protruding outwards and running at least part of the circumferential direction along the outside and thereby having a slope in comparison to a longitudinal central axis through the rotor shaft.

9. Pump according to claim 8, characterized in that the cylinder shoulder is hollow and a lid is placed on it, the at least one guide vane being arranged on the outside of the lid, the lid preferably having a passage and/or a Bearing for the rotor shaft and in particular the impeller is arranged at a distance of less than 5 mm above the cover.

10. Pump according to claim 9, characterized in that the cover with the stator has a bearing carrier for a bearing of the rotor shaft, in particular a bearing for a bearing bush for the rotor shaft.

1 1 . Pump according to claim 9 or 10, characterized in that the cover or the stator is designed off-centre to a longitudinal central axis through the rotor shaft or off-center to an outer wall of the pump chamber.

12. Pump according to one of the preceding claims, characterized in that the conveying direction of the conveyed fluid within the pump housing or within the pump never runs in the opposite direction to the inflow direction through the inlets into the pump chamber, preferably this conveying direction in the pump always having an axial component along the axial direction or parallel to the inflow direction at the inlet until the pumped fluid leaves the pump chamber at the outlet, with an axial movement component of the pumped fluid greater than zero in this direction preferably also being present in the impeller.