Fluid pump with heat dissipation

Patent metadata

Field	Value
Publication number	US-2019109516-A1
Application number	US-201816151539-A
Country	US
Kind code	A1
Filing date	Oct 4, 2018
Priority date	Oct 6, 2017
Publication date	Apr 11, 2019
Grant date	—

Abstract

A fluid pump, having a pump impeller, mounted so as to rotate around an axle, in a conveyed medium in a wet area and a conductor plate, which is arranged in a dry area sealed off from the conveyed medium, wherein radial forces of the axle are accommodated, on one side, by a separating wall between the dry area and the wet area and by a pump head on the other side. The object of the invention is to provide structural features to ensure an optimum dissipation of heat from a conductor plate and its power components to the conveyed medium without negatively impacting the hydraulic efficiency of the pump.

First claim

What is claimed is:

1 . A fluid pump for use in a cooling medium circuit, the fluid pump comprising:
an axle; a wet area having a conveyed medium; a dry area; a pump impeller mounted on the axle so as to rotate around the axle in the conveyed medium in the wet area; a conductor plate arranged in the dry area sealed off from the conveyed medium in the wet area, wherein radial forces of the axle are accommodated, on one side of the axle, by a separating wall between the dry area and the wet area and by a pump head on the other side of the axle; and electronic components mounted on the conductor plate, the electronic components generating heat that is dissipated via a heat-conducting path to the cooling medium circuit, the heat conducting path including the axle and first and second axle retainers, which transfer the radial forces of the axle from the axle to the separating wall and the pump head.

2 . The fluid pump according to claim 1 , wherein the separating wall has a base and wherein the first axle retainer is fitted against the base, arranged axially to an axis of rotation of the pump impeller.

3 . The fluid pump according to claim 1 , wherein the pump head has a intake duct and wherein the second axle retainer is arranged in the intake duct of the pump head and the conveyed medium at least partially flows around it during operation.

4 . The fluid pump according to claim 1 , wherein a heat-conducting plate is arranged so as to tightly fit between the conductor plate and the separating wall and represents a component of the heat-conducting path.

5 . The fluid pump according to claim 4 , wherein the heat-conducting plate has shapes that enlarge its surface area, which are matched to corresponding counter-shapes in the separating wall.

6 . The fluid pump according to claim 5 , characterized in that the conductor plate has a plurality of vias, forming a heat-conducting connection of power components through the conductor plate to their opposite side and is in heat-conducting contact with the heat-conducting plate directly there or via a heat-conducting medium.

7 . The fluid pump according to claim 5 , wherein the conductor plate has at least one recess through which a power component extends and is directly in heat-conducting contact with the heat-conducting plate or via a heat-conducting medium.

8 . The fluid pump according to claim 5 , wherein the heat-conducting plate forms at least one electric conductor of the conductor plate.

9 . The fluid pump according claim 5 , wherein the axle has a retainer sleeve and wherein the first axle retainer has a contact disk, the extensive surface of which tightly fits against the separating wall, and the retainer sleeve.

10 . The fluid pump according to claim 9 , wherein the separating wall has a tube-shaped area and wherein the first axle retainer has a support collar connecting to the contact disk, with the support collar providing radial support in the tube-shaped area.

11 . The fluid pump according to claim 1 , wherein the pump impeller is mounted on the axle by means of sleeve-like slide bearings, which divert a part of the heat absorbed by the axle to the pump impeller.

12 . The fluid pump according to claim 1 , wherein the axle has at least two differently sized diameter ranges, wherein the axle section with the larger diameter is accommodated in the first axle retainer.

13 . The fluid pump according to claim 1 , wherein the second axle retainer consists of material with good heat conductivity and has one additional slide bearing and at least one spoke, which form a single-piece body.

14 . The fluid pump according to claim 13 , wherein the second axle retainer is joined by molding to the pump head, particularly an intake duct of the pump head, wherein the pump head consists of a plastic material, which can be processed through injection molding.

15 . The fluid pump according to claim 13 , wherein the intake duct is a single-piece component of the second axle retainer.

16 . The fluid pump according to claim 15 , wherein the intake duct is joined by molding to the pump head, wherein the pump head consists of a plastic material, which is processed through injection molding.

17 . The fluid pump according to claim 1 , wherein the axle is made of an aluminum alloy.

18 . The fluid pump according to claim 17 , wherein the axle is provided with a wear-resistant layer, particularly a molybdenum, chromium oxide, aluminum oxide, nickel, or bronze layer, at least in the bearing area.

19 . The fluid pump according to claim 18 , wherein at least one slide bearing is pressed onto the axle, wherein the slide bearing consists of plastic, metal, a graphite-containing material, or a ceramic material.

20 . The fluid pump according to claim 1 , wherein at least one axle retainer consists of an aluminum material.

21 . The fluid pump according to claim 1 , wherein the ratio between the diameter and length of the axle is greater than 0.1, particularly greater than 0.15, and preferably greater than 0.2.

22 . The fluid pump according to claim 1 , wherein at least one of the axle retainers consists of aluminum or magnesium.

23 . The fluid pump according to claim 5 , wherein the shapes consist of walls projecting all around.

24 . The fluid pump according to claim 5 , wherein the shapes consist of projecting pins.

25 . The fluid pump according to claim 4 , wherein the heat conducting plate forms at least one electric conductor or a conductor area of the conductor plate.

26 . The fluid pump according to claim 9 , wherein 16 the diameter of the axle is at least 20% of the diameter of the first axle retainer in the area of the contact wheel.

27 . The fluid pump according to claim 11 , wherein the length of a slide bearing corresponds to at least 10% of the length of the axle.

28 . The fluid pump according to claim 13 , wherein the second axle retainer is joined to the pump head through an intake duct of the pump head through a pressing force.

29 . The fluid pump according to claim 1 , wherein the material for the separating wall is modified with additives having good heat conductivity.

Assignees

• Buhler Motor Gmbh

Inventors

• Bernreuther Georg

Classifications

• F04B53/08

  Cooling; Heating; Preventing freezing · CPC title

• F04B2203/0205

  Temperature · CPC title

• H02K9/22 Primary

  by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges · CPC title

• H02K2209/00

  Specific aspects not provided for in the other groups of this subclass relating to systems for cooling or ventilating · CPC title

• H02K5/18

  with ribs or fins for improving heat transfer · CPC title