FLUID PUMP

Abstract

A fluid pump includes an internal rotor rotatable about an axis of rotation and having a non-rotatable external stator and an impeller having multiple blades axially arranged between a support disc and a cover disc. The rotor has a rotor housing having a base, a mounting sleeve and a cover, in which an armature unit of the rotor is received so as to be fluid-tight towards the outside. The support disc of the impeller forms the cover of the rotor housing and axially seals the mounting sleeve. The impeller includes a first part and a second part which are fixed to one another in a material bonded manner. Here, the blades are exclusively formed integrally on the first part or on the second part, axially project from this part on one side and are axially covered by the respective other part.

Claims

1. A fluid pump comprising: an internal rotor rotatable about an axis of rotation and having a non-rotatable external stator; and an impeller with multiple blades which are axially arranged between a support disc and a cover disc, wherein the rotor comprises a rotor housing having a base, a mounting sleeve and a cover, in which an armature unit of the rotor is received so as to be fluid-tight towards the outside, wherein the support disc of the impeller forms the cover of the rotor housing and axially seals off the mounting sleeve, wherein the impeller comprises a first part and a second part which are fixed to one another in a material bonded manner, and wherein the blades are integrally formed exclusively on the first part or on the second part, axially project from this part unilaterally and are axially covered by the respective other part.

2. The fluid pump according to claim 1, wherein: the first part is formed by the support disc, the second part is formed by the cover disc and the blades that are integrally formed on the cover disc and a center part of the impeller that is integrally formed on the blades, and the blades and the center part are fixed to the support disc and thus the second part to the first part in a material bonded manner.

3. The fluid pump according to claim 1, wherein: the first part is formed by the support disc and by a center part of the impeller that is integrally formed on the support disc and by the blades that are integrally formed on the support disc and on the center part, the second part is formed by the cover disc, and the blades are fixed to the cover disc and thus the first part to the second part in a material bonded manner.

4. The fluid pump according to claim 1, wherein: the first part and the second part of the impeller are fixed to one another in a material bonded manner by way of ultrasound welding or by way of friction welding.

5. The fluid pump according to claim 1, wherein: the mounting sleeve of the rotor housing is integrally formed on the support disc, and the base axially seals the mounting sleeve.

6. The fluid pump according to claim 1, wherein: the mounting sleeve and the base of the rotor housing are integrally formed on one another, and the support disc axially seals the mounting sleeve.

7. The fluid pump according to claim 1, wherein in a center part of the impeller circulating about the axis of rotation a bearing is arranged, in which a shaft of the fluid pump is mounted.

8. The fluid pump according to claim 7, wherein the bearing is fixed in the center part of the impeller by a form-fitting unit in a form-fitting and non-rotatable and/or material bonded and non-rotatable manner.

9. The fluid pump according to claim 7, wherein the center part is formed from a sliding bearing material and the bearing is integrally formed in the center part.

10. The fluid pump according to claim 7, wherein on the impeller, facing away from the rotor, at the face end at least one assembly recess is formed which is orientated parallel to and arranged spaced from the axis of rotation of the rotor.

11. The fluid pump according to claim 1, wherein the fluid pump is an electric liquid pump.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The disclosure will now be described with reference to the drawings wherein:

[0017] FIG. 1 shows a sectional view of a fluid pump according to a first embodiment of the disclosure;

[0018] FIGS. 2 and 3 show views of a rotor and of an impeller of the fluid pump according to the first exemplary embodiment of the disclosure;

[0019] FIG. 4 shows a sectional view of the rotor and of the impeller of the fluid pump according to the first exemplary embodiment the disclosure;

[0020] FIGS. 5 and 6 show exploded views of the rotor and of the impeller of the fluid pump according to the first exemplary embodiment of the disclosure;

[0021] FIG. 7 shows a sectional view of the rotor and of the impeller of the fluid pump according to a second exemplary embodiment of the disclosure; and

[0022] FIGS. 8 and 9 show exploded views of the rotor and of the impeller of the fluid pump according to the second exemplary embodiment of the disclosure.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

[0023] FIG. 1 shows a sectional view of a fluid pump 1 according to a first exemplary embodiment of the disclosure. Here, the fluid pump 1 includes a rotatable rotor 2 and a non-rotatable stator 3. The rotor 2 is rotatably arranged within the stator 3 so as to be rotatable in the same about an axis of rotation R. Furthermore, the fluid pump 1 includes an impeller 4, which is non-rotatably fixed to the rotor 2. An enlarged sectional view of the rotor 2 and of the impeller 4 is shown in FIG. 4. The impeller 4 includes multiple blades 5 which are axially arranged between a support disc 6 and a center part 24 of the impeller 4 and a cover disc 7. The rotor comprises a rotor housing 8 which comprises a base 9, a mounting sleeve 10 and a cover 11. The base 9 and the cover 11 seal the mounting sleeve 10 axially in a fluid-tight manner. The cover 11 of the rotor housing 8 is formed by the support disc 6 of the impeller 4, as a result of which the impeller 4 is non-rotatably fixed to the rotor 2 and with the same rotatably in the stator 3. In the rotor housing 8, an armature unit 12 of the rotor 2 is mounted fluid-tight towards the outside, which armature unit 12 electromechanically interacts with the stator 3. Furthermore, the fluid pump 1 includes a shaft 13 which is mounted by a bearing 14 and a second bearing 15 in a pump housing 16. Here, the bearing 14 is non-rotatably fixed in the center part 24 of the impeller 4 and the second bearing 15 on the base 9 of the rotor housing 8. The shaft 13 is non-rotatably fixed in the fluid pump 16. To this end, the shaft 13 is overmolded in a spacer can 21 in the region of a knurl or a toothing 22 and the spacer can 21 and thus the shaft 13 are then non-rotatably mounted in the pump housing 16. Practically, the rotor 2 and the impeller 4 are then rotatably mounted about the shaft 13.

[0024] The impeller 4 according to the disclosure is formed in two parts and includes a first part 17 and a second part 18 which are fixed to one another in a material bonded manner. In the first exemplary embodiment of the fluid pump 1, the first part 17 is formed by the support disc 6 and the second part 18 by the cover disc 7, which on the same forms integrally molded blades 5 and the center part 24 integrally formed on the blades 5. The blades 5 and the center part 24 are fixed to the support disc 6 and thus the second part 18 to the first part 17 of the impeller 4 in a material bonded manner for example by way of ultrasound welding or by way of friction welding. In the first exemplary embodiment, the base 9 and the mounting sleeve 10 of the rotor housing 8 are additionally formed integrally on one another and the support disc 6 axially seals the mounting sleeve 10. Following the mounting of the armature unit 12 in the mounting sleeve 10, the support disc 6 can be fixed to the same in a material bonded manner by way of ultrasound welding or by way of friction welding.

[0025] FIG. 2 and FIG. 3 show views of the rotor 2 and of the impeller 4 of the fluid pump 1 in the first exemplary embodiment. In the center part 24 of the impeller 4, the bearing 14 is fixed by a form-fitting unit 19 having multiple radially orientated projects 20 in a form-fitting and non-rotatable manner. In addition, the bearing 14 and the center part 24 of the impeller 4 can be fixed to one another in a material bonded manner by way of ultrasound welding. Alternatively, the center part 24 can also be injection-molded about the bearing 14. Furthermore, multiple assembly recesses 23 are formed on the center part 24 and thus on the impeller 4 at the phase end, which are orientated parallel to the axis of rotation R. The assembly recesses 23 circulate, spaced apart, the axis of rotation R and are provided for the engaging of a tool. This can take place for example during the assembly of the fluid pump 1 and in particular during the friction welding.

[0026] FIG. 5 and FIG. 6 show exploded views of the rotor 2 and of the impeller 4 of the fluid pump 1 in the first exemplary embodiment from different sides. As already explained above, the base 9 and the mounting sleeve 10 of the rotor housing 8 are formed in one piece. The support disc 6 then seals the mounting sleeve 10 following the mounting of the armature unit 12 and can be fixed to the mounting sleeve 10 in a form-fitting manner for example by way of ultrasound welding or by way of friction welding.

[0027] FIG. 7 shows a sectional view of the rotor 2 and of the impeller 4 of the fluid pump 1 according to a second exemplary embodiment of the disclosure. FIG. 8 and FIG. 9 show exploded views of the rotor 2 and of the impeller 4 of the fluid pump 1 in the second exemplary embodiment. In the second exemplary embodiment of the fluid pump 1, the first part 17 of the impeller 4 is formed by the support disc 6 and the blades 5 that are integrally formed on the same. The second part 18 is then formed by the cover disc 7. The blades 5 are fixed to the cover disc 7 and thus the first part 17 to the second part 18 of the impeller 4 in a form-fitting manner for example by way of ultrasound welding or by way of friction welding.

[0028] Furthermore, the support disc 6 in the fluid pump 1 in the second exemplary embodiment is formed in one piece with the mounting sleeve 10. Then, the base 9 axially seals the mounting sleeve 10 following the mounting of the armature unit and can be fixed to the mounting sleeve 10 in a form-fitting manner for example by way of ultrasound welding or by way of friction welding. In the second exemplary embodiment of the fluid pump, the mounting sleeve 10 with the first part 17 of the impeller 4 constitutes the sole complex component. The second part 18 of the impeller 4 and the base 9 of the rotor housing 8 by contrast are of a comparatively simple configuration. Because of this, the process reliability during the form-fitting fixing of the cover disc 7 to the blades 5 of the impeller 4 and of the base 9 to the mounting sleeve 10 can be increased. Otherwise, the construction of the fluid pump 1 in the second exemplary embodiment corresponds to the construction of the fluid pump 1 in the first exemplary embodiment

[0029] Summarizing, the impeller 4 of the fluid pump 1 according to the disclosure is formed in two parts so that complex geometries are realizable in the impeller 4. Furthermore, the first part 17 and the second part 18 of the impeller 4 can be formed from different materials, so that the choice of material can also be expanded and the manufacturing costs reduced. It is to be understood that further exemplary embodiments of the fluid pump 1 according to the disclosure not explicitly described here are conceivable.