Device for conveying a liquid

Abstract

The invention relates to a device for conveying a liquid, comprising a shaft (29) which extends in a longitudinal direction (1) and has an impeller (28) held thereon; an electric motor (10) which can be actuated in two rotational directions (7, 8) and has a rotor (11) fixed to the shaft (29) and a stator (12) surrounding the rotor (11); a hydraulic housing which provides an inlet (25) for the liquid and a first pressure port (21) and a second pressure port (22) for the liquid; and a flow selector (30), wherein one side of the flow selector (30) is fixed to the hydraulic housing at a bearing point (26), the flow selector (30) can be moved into a first selection position and into a second selection position and back on the basis of the rotational direction, the flow selector (30) provides two sealing surfaces (31, 32), the flow selector (30), in the first selection position, closes the first pressure port (21) by means of a first sealing surface (31) or, in the second selection position, closes the second pressure port (22) by means of a second sealing surface (32), and the flow selector (30) tapers in the direction of the bearing point (26) preferably in the shape of a wedge and provides the sealing surfaces (31, 32) on two tapered surfaces lying opposite each other.

Description

[0001]

[0002] Applicant: Hanning Elektro-Werke GmbH & Co. KG

[0003] Holter Street 90

[0004] 33813 Oerlinghausen

[0005] Our reference HAN2405PCT2

[0006] Date: June 18, 2025

[0007] Device for conveying liquid

[0008] The invention relates to a device for conveying a liquid comprising a longitudinally extending shaft with a pump impeller held thereon, comprising an electric motor operable in two directions of rotation with a rotor fixed to the shaft and a stator encompassing the rotor, comprising a hydraulic housing which provides an inlet for the liquid as well as a first pressure port and a second pressure port for the liquid, and comprising a flow selector, wherein the flow selector is fixed on one side in a bearing point on the hydraulic housing, wherein the flow selector is moved into a first selection position and into a second selection position and back again depending on the direction of rotation of the electric motor and the pump impeller driven by it.wherein the flow selector provides two sealing surfaces and wherein the flow selector, in the first selection position, seals the first pressure port with a first sealing surface or, in the second selection position, seals the second pressure port with a second sealing surface.

[0009] US Patent 5984644 A discloses a device for conveying liquid with a flow selector that includes a thin, membrane-like sealing disc which is elastically deformable and supported on two sides. The sealing disc of the flow selector deforms depending on the direction of rotation and always closes one of the two pressure ports of the device during use.

[0010] From FR 1 142593 A, a device for conveying liquid is known, comprising a flow selector that is supported on one side and also has a thin sealing disc. The sealing disc is made of a sufficiently strong material that does not deform during intended use. To selectively close one of the two pressure ports, the flow selector with the sealing disc is pivoted or folded over depending on the direction of rotation of the pump impeller.

[0011] The object of the present invention is to advantageously further develop a device for conveying liquid.

[0012] To solve the problem, the invention in conjunction with the preamble of claim 1 is characterized in that the flow selector tapers in the direction of the bearing point, at least sectionally and preferably in a wedge shape, and provides sealing surfaces on two opposing tapered surfaces.

[0013] The particular advantage of the invention lies in the fact that the segmented wedge shape of the flow selector enables rapid actuation, resulting in a quick change of the selected position and the flow direction. The wedge-shaped geometry ensures that the switching path for closing one pressure port and opening the other is short. At the same time, the wedge-shaped geometry gives the flow selector a higher mass, which improves the closing effect and reduces the tendency to vibrate when the pump impeller is rotating.

[0014] The hydraulic housing of the device can, for example, be made up of multiple parts. The multi-part design of the hydraulic housing facilitates assembly.

[0015] For example, a hydraulic housing can be provided that accommodates or surrounds the impeller, along with a cover that seals against the hydraulic housing. The inlet can be located, for example, on the cover of the hydraulic housing, while the pressure ports can be located on the hydraulic housing itself. The pivot point for the flow selector can be located, for example, on the hydraulic housing, preferably between the first and second pressure ports.

[0016] In a preferred embodiment of the invention, the undeformed flow selector is designed asymmetrically with respect to a central plane of its body in a neutral position provided between the first and second selection positions. Preferably, a longitudinal central axis of the shaft of the conveying device extends in the central plane of the body in the neutral position of the flow selector. Advantageously, the asymmetrical shape of the flow selector allows the pressure ports of the device to be designed differently, particularly with respect to their diameter or cross-section, and thus the delivery rate to be influenced independently of the motor speed.

[0017] According to a further development of the invention, sealing elements are provided as part of the sealing surfaces. These sealing elements are preferably designed as sealing plateaus, that is, as raised surfaces, particularly disc-shaped ones, relative to the sealing surface. The sealing effect is advantageously further improved by providing the sealing elements or sealing plateaus. At the same time, the sealing plateaus have a damping effect during the switching of the flow selector due to their elasticity, thus improving the operating and noise characteristics of the device. For example, the sealing elements can be implemented as sealing lips, particularly as circumferential, annular sealing lips. The sealing lips or sealing plateaus are arranged such that, in the first and second selector positions, they enclose or cover a flow opening of the first pressure port or a flow opening of the second pressure port, respectively.

[0018] According to a further development of the invention, the undeformed flow selector is formed asymmetrically with respect to the sealing elements or sealing plates. In particular, it can be provided that the sealing elements or sealing plates are adapted in size and shape to the diameter and cross-section of the pressure ports. Advantageously, adapting the size and shape of the sealing elements or sealing plates to the diameter or cross-section of the pressure ports ensures a consistently good sealing effect.

[0019] According to a further development of the invention, the undeformed flow selector is asymmetrically formed only with respect to the sealing elements or sealing plates, whereas a base body supporting the sealing elements or sealing plates and providing the tapered or sealing surfaces is symmetrically formed with respect to the body's central plane. Due to the symmetrical design of the base body, which provides a predominant part of the flow selector's mass, the dynamics and switching behavior of the flow selector are essentially the same regardless of the direction of rotation of the impeller.

[0020] According to a further development of the invention, the flow selector is made of an elastic, deformable material. For example, a rubber-like material, preferably silicone or a thermoplastic elastomer (TPE), is used for the flow selector. Advantageously, the flow selector possesses inherent compliance due to the use of an elastic and deformable material. This inherent compliance results in a deformability that can be used to move the flow selector into the first and / or second selection position. The flow selector is then in a first or second deformation state in the first or second selection position, respectively.

[0021] For example, the flow selector can be undeformed in the neutral position and deformed in each of the selection positions.

[0022] According to a further development of the invention, the flow selector is manufactured in one piece. This one-piece design simplifies manufacturing and handling, for example, during assembly. It is also possible to form the sealing plates optionally provided on the sealing surfaces during the manufacturing process. The flow selector can be produced, for example, by primary forming or by an additive manufacturing process.

[0023] According to a further development of the invention, the flow selector has a receiving section and the hydraulic housing has a receptacle shaped correspondingly to the receiving section of the flow selector to form the bearing point. To secure the flow selector in the hydraulic housing, the receiving section is inserted into the receptacle. For example, the flow selector can be manufactured with an interference fit in the area of ​​the receiving section relative to the receptacle, so that the receiving section is inserted into the receptacle using the elasticity of the flow selector and is then held or secured therein with a force-fit and backlash-free connection.

[0024] According to a further development of the invention, the receiving section of the flow selector is formed in a substantially cylindrical shape. The cylindrical shape of the receiving section is suitable for primary forming or additive manufacturing.

[0025] Furthermore, the flow selector can be easily mounted using the cylindrical receiving section.

[0026] In a further development of the invention, a web section adjoins the receiving section of the flow selector on the side facing the sealing surfaces. The sealing surfaces of the flow selector extend to or adjoin this web section. The web section is thus arranged between the receiving section and the sealing surfaces of the flow selector. Advantageously, the web section can have a thin, slender, elongated shape. It thus forms the preferred, defined area for the elastic deformation of the flow selector when it is moved into the first or second selection position. Deformation of the flow selector in the area of ​​the sealing surfaces is avoided. The sealing effect of the flow selector is therefore further improved by providing the web section, on which the sealing surfaces are not located.At the same time, the flow selector can be fitted so tightly into the hydraulic housing in the area of ​​the web section that a rotational or tilting movement of the flow selector as a whole is blocked, or the flow selector cannot be tilted or pivoted as a whole. In this case, it is not absolutely necessary to manufacture the receiving section to an oversize.

[0027] According to a further development of the invention, the flow selector has a trapezoidal shape. In particular, it can be provided that on a side of the sealing surfaces opposite the bearing point, two outer surfaces are provided that taper towards a free end opposite the bearing point and serve as flow surfaces. The flow surfaces can, for example, be concavely curved or be shaped corresponding to an inner contour of the hydraulic housing, to which a first flow surface faces in the first selector position of the flow selector and a second flow surface faces in the second selector position. The flow surfaces are preferably located spatially adjacent to the impeller or facing it. They form a surface for the fluid to actuate and help ensure that the flow selector is actuated when the electric motor starts up and when the direction of rotation changes.Furthermore, they have a stabilizing effect during operation by ensuring that the flow selector remains securely in the first or second selection position during operation of the conveying device.

[0028] In a further development of the invention, the flow selector features a recess on the rear side of the flow selector, facing away from the inlet or towards the electric motor. The pump impeller or parts of the motor housing engage in this recess. This recess allows for a very compact design of the flow selector and enables its use even in confined spaces. At the same time, the response of the flow selector is improved by its close proximity to the pump impeller, as the flow selector is preferably positioned with its inflow surfaces in the fluid flow provided by the pump impeller. Preferably, the recess is formed in the area of ​​the inflow surfaces and extends to the free end of the flow selector.

[0029] According to a further development of the invention, the distance between the free end of the flow selector and the pump impeller, determined in a radial direction perpendicular to the longitudinal direction, is small, preferably in the range of 0 to 3 mm. This also advantageously promotes a favorable response behavior of the flow selector when the direction of rotation is reversed. Furthermore, the small distance and the very compact design due to the recess are also advantageous when the pump starts up from standstill, when the flow selector is moved from the neutral position to the first or second selection position, depending on the direction of rotation.

[0030] In a further development of the invention, a BLDC motor is used as the electric motor of the device. Advantageously, the use of the BLDC motor allows for a simple reversal of the direction of rotation and enables the speed to be varied or adjusted as required. Therefore, by using the BLDC motor, it is possible to vary the conveying direction and / or, by setting different operating points via the speed, to vary the conveying rate.

[0031] This device can be advantageously used in a washing machine. Thanks to its two direction-dependent pumping options, the device can be used for both circulating and pumping out liquid, thus replacing the two pumps currently required (circulation pump and drain pump). Using a single device for both circulating and draining can therefore reduce costs, ease of installation, and minimize the required installation space.

[0032] According to a further development of the invention, the device provides a filter with a filter element, wherein the filter element is inserted into a filter housing of the filter that is attached to or integrally formed with the hydraulic housing. The filter assembly includes a radial inlet opening through which the fluid enters the filter, and an axially oriented fluid channel as an outlet opening through which the fluid flows to the inlet of the hydraulic housing. Advantageously, the filter cleans the pumped fluid and counteracts contamination of the device, particularly in the area of ​​the pump impeller, with the result that contamination-related failures are reduced.

[0033] According to a further development of the invention, the filter housing provides an intake port for the liquid, through which the liquid flows to the inlet opening of the filter element. Preferably, the intake port is oriented perpendicular to the longitudinal direction or projects laterally from the filter housing, thus facilitating the connection of a supply line to the intake port.

[0034] According to a further development of the invention, the filter element is inserted axially into the filter housing and preferably screwed in. Advantageously, this allows the filter element to be easily removed, replaced, cleaned, and reinserted.

[0035] Further advantages, features, and details of the device according to the invention can be found in the dependent claims, the drawings, and the following description. Features mentioned therein can be essential to the invention individually or in any combination. Thus, the disclosure relating to the individual aspects of the invention can always be referred back to each other.

[0036] The drawings serve only as examples to clarify the invention and are not intended to be restrictive. They show:

[0037] Fig. 1 shows a perspective view of a device for conveying liquid with two pressure nozzles and a filter,

[0038] Fig. 2 shows a perspective view of a filter insert of the filter of the device according to Fig. 1.

[0039] Fig. 3 shows a longitudinal section through the filter insert according to Fig. 2,

[0040] Fig. 4 shows a partial view of the device according to Fig. 1 without filter insert in a top view.

[0041] Fig. 5 shows a cross-section through a hydraulic housing of the device according to Fig. 1 with a flow selector in a neutral position, wherein the flow selector is fixed in the hydraulic housing,

[0042] Fig. 6 shows a partial longitudinal section through the device according to Fig. 1, Fig. 7 shows a front view of the flow selector of the device according to Fig.

[0043] 1,

[0044] Fig. 8 shows a first side view of the flow selector of the device according to Fig. 1,

[0045] Fig. 9 shows a second side view of the flow selector of the device according to Fig.

[0046] 1,

[0047] Fig. 10 shows the representation according to Fig. 5 with the flow selector in a first selection position and

[0048] Fig. 11 shows the representation according to Fig. 5 with the flow selector in a second selection position.

[0049] A device for conveying a liquid comprises a shaft 29 extending in a longitudinal direction 1, a pump impeller 28 held non-rotatably on the shaft 29, and an electric motor 10. The electric motor 10 is, for example, designed as a BLDC motor and can be operated in two opposite directions of rotation 7, 8. The electric motor 10 includes a rotor held non-rotatably on the shaft 29, a stator surrounding the rotor on the outside, and a motor housing 13.

[0050] The impeller 28 is fixed at its end to the shaft 29. It is located in a hydraulic housing 20 of the device. The hydraulic housing surrounds the impeller 28 and has an outwardly projecting flange on the side facing away from the electric motor 10. Additionally, the hydraulic housing 20 has a first pressure port 21 and a second pressure port 22 for discharging the fluid.

[0051] The motor housing 13 of the electric motor 10 is attached to the hydraulic housing 20 of the device on one side, and a filter with a filter housing 50 and a filter element 51 screwed into the filter housing 50 is attached to the other. The filter housing 51 has a suction port 52 through which the fluid is drawn in. The electric motor 10 of the device, which can be operated in a variable direction, serves to discharge the fluid from the hydraulic housing 20, depending on the respective direction of rotation 7, 8, either via the first drain port 21 or the second drain port 22. The pressure ports 21, 22 are formed as an integral part of the hydraulic housing 20. Fluid lines (not shown) are connected to the pressure ports 21, 22, as well as to the suction port 52. These lines can be used, for example, to pump or recirculate the fluid in a flushing circuit or to pump it into a sink.

[0052] The filter of the device, positioned upstream of the hydraulic housing 20 with the impeller 28, serves to clean the pumped fluid. For this purpose, the filter includes a filter element 51 inserted into the filter housing 50. The filter housing 50 is sealed to the correspondingly shaped hydraulic housing flange 24 by means of a filter housing flange 53, which projects radially outwards from the filter housing 50, and is, for example, bolted to it. The filter housing flange 52 extends transversely to the longitudinal direction 1. It provides an inlet 25, formed as a through-hole, through which the fluid passes from the filter into the hydraulic housing 50. The inlet 25 is arranged coaxially with the impeller 28 and the shaft 29 of the device.

[0053] To clean the liquid in the filter, the liquid drawn in through the intake nozzle 52 flows through an inlet opening 54 formed laterally on the filter element 51 and further through a passage 57 into a fluid channel 55, which extends in the longitudinal direction 1 and is arranged coaxially to the shaft 29 and the inlet 25. Upon entering the fluid channel 55, which is bounded, for example, by a circular upper edge 58, the laterally flowing liquid is deflected and swirled. The fluid channel 55 widens towards the inlet 25 and forms a funnel 59 there.

[0054] To facilitate easy installation and removal of the filter for cleaning or replacement, it features a handle 56 on the side facing away from the filter housing flange 53 when installed. The handle 56 is connected via two axially extending webs 61 to a plate 60 extending parallel to the filter housing flange 53, which in turn holds the funnel 59 of the fluid channel 55 projecting towards the handle 56. The passage gap 57 is formed between the handle 56 and the fluid channel 55.

[0055] To vary the flow direction of the fluid depending on the direction of rotation, the device provides a flow selector 30. The flow selector 30 is located in the hydraulic housing 20. A pivot point 26 secures the flow selector 30 within the hydraulic housing 20.

[0056] The flow selector 30 is manufactured in one piece from an elastic, deformable material, preferably silicone. In a first selection position, it closes the first pressure port 21 (see Fig. 10), and in a second selection position (see Fig. 11), it closes the second pressure port 22.

[0057] The flow selector 30 has two sealing surfaces 31, 32 arranged at an angle to each other and tapering towards the bearing point 26. In the first selector position, the first sealing surface 31 of the flow selector 30 seals the first pressure port 21. In the second selector position, the second sealing surface 32 of the flow selector 30 seals the second pressure port 22. The sealing effect is provided or improved by two sealing plates 35, 36, which are formed as part of the sealing surfaces 31, 32. The sealing plates 35, 36 are circular and disc-shaped, respectively. In the first and second selector positions, they cover a flow opening of the first pressure port 21 and a flow opening of the second pressure port 22, respectively.

[0058] To pump different volumes of liquid depending on the direction of rotation, one option is to operate the electric motor 10, preferably a BLDC motor, at a speed set according to demand. Furthermore, the pressure ports 21 and 22 are dimensioned differently. The first pressure port 21 has a smaller diameter than the second pressure port 22. The first pressure port 21 is therefore used to pump a smaller volume flow of liquid, for example, during flooding, whereas the second pressure port 22 is used to pump a larger volume flow, for example, during pumping out the liquid. To close the unused pressure port 21 or 22 depending on the selected setting, the two sealing plates 35 and 36 of the flow selector 30 are adapted to the different diameters of the pressure ports and are of different sizes.Due to the different sizes of the sealing plateaus 35, 36, the flow selector 30 is asymmetrically designed.

[0059] On the side of the sealing surfaces 31, 32 facing the bearing point 26, the flow selector 30 provides a receiving section 33 and a web section 34 between the receiving section 33 and the sealing surfaces 31, 32. The receiving section 33 is cylindrical. To form the bearing point 26, it engages in a receptacle 23, which is shaped correspondingly to the cylindrical form of the receiving section 33 and is located on the hydraulic housing 20. The flow selector 30, made of an elastic material, is manufactured with an interference fit in the area of ​​the receiving section 33 relative to the inner contour of the receptacle 23, so that the flow selector 30, together with the receiving section 33, is pressed into the receptacle 23 and is then held therein by frictional engagement.In addition, the flow selector 30 is fitted section by section into the hydraulic housing 20 in the area of ​​the bridge section 34 in such a way that a rotation or tilting movement of the flow selector 30 is completely blocked.

[0060] The web section 34 forms the part of the flow selector 30 that is preferably deformed when the latter is moved into the first or second selection position. The flow selector 30 is thus elongated, thin, and flexible in the web section 34. While the web section 34 is oriented in a radial direction 4 extending perpendicular to the longitudinal direction 1 in a neutral position of the flow selector 30 provided between the first and second selection positions (see Fig. 5), the web section 34 is bent or curved in the first and second selection positions.

[0061] On one side of the sealing surfaces 31, 32 opposite the receiving section 33 or the web section 34, the flow selector 30 provides two inflow surfaces 37, 38. The inflow surfaces 37, 38 converge towards a free end 42 of the flow selector 30. The flow selector 30 tapers in the region of the inflow surfaces 37, 38 towards the free end 42. The body of the flow selector 30 thus has an approximate trapezoidal shape in the region of the sealing surfaces 31, 32 and the inflow surfaces 37, 38. In its undeformed state, the approximately trapezoidal body of the flow selector 30 is symmetrical with respect to a body midplane 3, which extends through the receiving section 33 and the web section 34 and provides the sealing surfaces 31, 32 and the inflow surfaces 37, 38 on both sides.The unequal sealing plateaus 35, 36 alone ensure that the flow selector 30 is asymmetrical with respect to the body's central axis 30.

[0062] In the area of ​​the inflow surfaces 37, 38, the flow selector 30 is concave, i.e., curved inwards. A surface of the inflow surfaces 37, 38 is shaped correspondingly to an inner contour of the hydraulic housing 20 such that, in the first selected position of the flow selector 30, a first inflow surface 37 is at least partially in contact with an inner surface of the hydraulic housing 20. Similarly, in the second selected position of the flow selector 30, a second inflow surface 38 of the flow selector 30 is at least partially in contact with an opposite inner surface of the hydraulic housing 20.

[0063] The inflow surfaces 37, 38 on the side of the flow selector 30 facing the impeller 28 serve, firstly, to move the flow selector 30 into the first or second selection position depending on the direction of rotation 7, 8 of the impeller 28. During operation of the pumping device, these surfaces are located in a flow provided by the liquid 28, so that when the impeller 28 rotates in the first direction 7, the liquid moves the flow selector 30 into the first selection position, and when the impeller 28 rotates in the second direction 8, it moves it into the second selection position. Simultaneously, the inflow surfaces 37, 38 help to keep the flow selector 30 stable in the first or second selection position as long as the impeller 28 rotates in the corresponding direction 7, 8.

[0064] To ensure the best possible and fastest possible actuation of the flow selector 30, or a short actuation time when moving it from the neutral position to the first or second selection position, the flow selector 30 projects beyond the impeller 28 in the direction of the radial direction 4, which is oriented perpendicular to the longitudinal direction 1, on a side opposite the electric motor 10. The flow selector 30 is arranged between the inlet 25 of the pump housing and within the impeller 28. At the same time, the flow selector 30 does not project beyond the longitudinal center axis 2; that is, a second distance 6, defined in the radial direction 4, between the free end 42 of the flow selector 30 and a longitudinal center axis 2 extending coaxially to the shaft 29 in the longitudinal direction 1 is greater than 0 mm. This second distance 6 is therefore considerably smaller than the radius of the impeller 28 defined in the radial direction 4.By ensuring that the flow selector 30 does not extend beyond the longitudinal center axis 2 of the device, a safe and fast response is guaranteed, since the flow surfaces 37, 38 do not extend into the counterflow, which forms on the half of the hydraulic housing opposite the flow selector 30 when the pump impeller 28 rotates, even in the neutral position of the flow selector 30.

[0065] An additional close spatial relationship between the flow selector 30 and the impeller 28 is achieved by a recess 41 in the flow selector 30. The recess 41 is located on the rear side 40 of the flow selector 30, facing the electric motor 10, in the area of ​​the inlet surfaces 37, 38 and the free end 42. A portion of the motor housing 30, in this case the canned tube flange, engages in the recess 41. The recess 41 is designed to achieve a compact form and high hydraulic efficiency of the device. A front side 39 of the flow selector 30, facing the filter and opposite the rear side 40 and the recess 41, connects the sealing surfaces 31, 32 and the inlet surfaces 37, 38. This front side extends from the receiving section 33 across the web section 34 to the free end 42 and is flat. Reference symbol list

[0066] 1 Longitudinal direction

[0067] 2 Longitudinal center axis

[0068] 3. Mid-body plane

[0069] 4 Radial direction

[0070] 6 distance

[0071] 7 Direction of rotation

[0072] 8 Direction of rotation

[0073] 10 Electric motor (with motor housing) 13 Motor housing

[0074] 20 hydraulic housings

[0075] 21 (small) first pressure port 22 (large) second pressure port 23 Intake

[0076] 24 Hydraulic housing flange

[0077] 25 inflows

[0078] 26 bearing point

[0079] 28 Pump wheel

[0080] 29th wave

[0081] 30 flow selectors

[0082] 31 Sealing surface

[0083] 32 sealing surface

[0084] 33 Recording section

[0085] 34 Bridge section

[0086] 35 Sealing plateau

[0087] 36 Sealing plateau

[0088] 37 Inflow area

[0089] 38 Inflow area

[0090] 39 Front

[0091] 40 Back

[0092] 41 Recess free end filter housing filter insert intake port filter housing flange inlet opening fluid channel handle passage gap edge

[0093] T funnel

[0094] plate

[0095] web

Claims

Patent claims 1. Device for conveying liquid comprising a shaft (29) extending in a longitudinal direction (1) with a pump impeller (28) held thereon, comprising an electric motor (10) operable in two directions of rotation (7, 8) with a rotor fixed to the shaft (29) and a stator encompassing the rotor, comprising a hydraulic housing which provides an inlet (25) for the liquid as well as a first pressure port (21) and a second pressure port (22) for the liquid, and comprising a flow selector (30), wherein the flow selector (30) is fixed on one side in a bearing point (26) on the hydraulic housing, wherein the flow selector (30) can be moved into a first selection position and into a second selection position and back depending on the direction of rotation, wherein the flow selector (30) has two sealing surfaces (31,32) and wherein the flow selector (30) in the first selection position closes the first pressure port (21) with a first sealing surface (31) or in the second selection position closes the second pressure port (22) with a second sealing surface (32), characterized in that the flow selector (30) preferably tapers in a wedge shape towards the bearing point (26) and provides the sealing surfaces (31, 32) on two opposing tapered surfaces.

2. Device according to claim 1, characterized in that the flow selector (30) is designed in a neutral position of the same undeformed and asymmetrical with respect to a body center plane (3) thereof, wherein the neutral position is provided between the first selection position and the second selection position.

3. Device according to claim 1 or 2, characterized in that the sealing surfaces (31, 32) provide sealing elements that can be applied to the pressure nozzles (21, 22), wherein the sealing elements are preferably designed as circumferential, annular sealing lips or as disc-shaped sealing plateaus (35, 36).

4. Device according to claim 2 or 3, characterized in that the undeformed flow selector (30) is designed asymmetrically with respect to the sealing elements.

5. Device according to claim 4, characterized in that the undeformed flow selector (30) is asymmetrical only with respect to the sealing elements, whereas a base body of the flow selector (30) supporting the sealing elements and providing the sealing surfaces (31, 32) is symmetrical with respect to the body's central plane (3).

6. Device according to one of claims 1 to 5, characterized in that the flow selector (30) is made of an elastic, deformable material, preferably a rubber-like material and particularly preferably silicone and / or a thermoplastic elastomer.

7. Device according to one of claims 1 to 6, characterized in that the flow selector (30) is manufactured in one piece.

8. Device according to one of claims 1 to 7, characterized in that the flow selector (30) has a receiving section (33) to form the bearing point (26), that a receiving section (23) corresponding to the receiving section (33) is formed on the hydraulic housing, and that the receiving section (33) of the flow selector (30) is inserted into the receiving section (23).

9. Device according to claim 8, characterized in that the receiving section (33) of the flow selector (30) is cylindrical and / or that a web section (34) adjoins the receiving section (33) of the flow selector (30) on a side facing the sealing surfaces (31, 32) and / or that the sealing surfaces (31, 32) of the flow selector (30) extend to the web section (34) of the flow selector (30) and / or adjoin the web section (34), wherein preferably the web section (34) of the flow selector (30) is elastically deformed and preferably bent in the first selection position and in the second selection position.

10. Device according to one of claims 1 to 9, characterized in that the flow selector (30) has a trapezoidal shape and / or provides two flow surfaces (37, 38) tapering towards a free end (42) of the flow selector (30) on a side of the sealing surfaces (31, 32) opposite the bearing point (26), wherein the flow surfaces (37, 38) are preferably concave and / or are shaped corresponding to an inner contour of the hydraulic housing, to which a first flow surface (37) in the first selection position of the flow selector (30) and a second flow surface (38) of the flow selector (30) in the second selection position are directed.

11. Device according to one of claims 1 to 10, characterized in that the flow selector (30) provides a recess (41) on a rear side (40) facing away from the inlet (25) and / or towards the electric motor (10), wherein the pump impeller (28) and / or parts of a motor housing (13) engage in the recess (41) of the flow selector (30) and / or wherein the recess (41) is provided in the area of ​​the inflow surfaces (37, 38) and / or extends to the free end (42) of the flow selector (30).

12. Device according to one of claims 1 to 11, characterized in that the flow selector (30) projects beyond the pump impeller (28) in a radial direction (4) oriented perpendicular to the longitudinal direction (1) on a front side opposite the electric motor (10) and / or facing the inlet (25).

13. Device according to one of claims 1 to 12, characterized in that a second distance (6) determined in the radial direction (4) between the free end (42) of the flow selector (30) and a longitudinal central axis (2) extending coaxially to the shaft (29) in the longitudinal direction (1) is greater than 0 mm.

14. Device according to one of claims 1 to 13, characterized in that the electric motor (10) is designed in the manner of a BLDC motor.

15. Device according to one of claims 1 to 14, characterized in that a filter is provided, wherein the filter has a filter element (51) inserted into a filter housing (50) and preferably screwed in, which a radial inlet opening (54) for the fluid and an axially oriented fluid channel (55) as an outlet opening for the fluid, through which the fluid passes to the inlet (25) of the hydraulic housing (20).

16. Use of a BLDC motor as an electric motor (10) of a device according to any one of claims 1 to 15.

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