Pump

Abstract

A pump for liquids is provided, comprising a pump chamber in which a bucket wheel is mounted on a bearing so that it can rotate, and an electric motor with a stator and a rotor. The stator has stator laminations and coils, and is coated with plastic in some parts and an electric/electronic activation device. The pump is intended to have a long service life and at the same time require as little installation space as possible. This is achieved by the stator laminations of the stator being at least in part electroplated.

Claims

1. A pump for fluids comprising: a pump chamber; a bucket wheel mounted in the pump chamber on a bearing for rotation; an electric motor, the electric motor including a stator and a rotor; wherein the stator further includes stator laminations and coils, each of the stator laminations including a front side that faces the rotor, a rear side opposite of the front side, and a left side and a right side positioned and located between the front side and the rear side; wherein the front side of each of the stator laminations is electroplated and is not coated with plastic; wherein the coils and the rear side, the left side, and the right side of the stator laminations are coated with plastic; and wherein an electronic activation device is positioned and located in the plastic coating.

2. The pump of claim 1, wherein the electroplated parts are allocated to a motor gap.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Reference is now made more particularly to the drawings, which illustrate the best presently known mode of carrying out the invention and wherein similar reference characters indicate the same parts throughout the views.

(2) FIG. 1 illustrates a longitudinal section through a pump.

DETAILED DESCRIPTION OF THE DRAWINGS

(3) As can be seen from FIG. 1, a pump for fluids comprises a pump chamber 1, an electric motor 2 and an electric/electronic activation device 3.

(4) The pump chamber 1 is, as is already known, formed in a pump housing, which in this case is formed from a lower pump housing section 4 with integrated suction port 5 and an upper pump housing section 6. In the pump chamber 1, a rotating bucket wheel 7 is mounted on a bearing, which bucket wheel is connected coaxially in its rotation axis with one first end of a shaft 8 such that it is torque proof. The shaft 8 is mounted on a bearing in the upper pump housing section 6 so that it can rotate. The pump housing sections 4, 6 are connected to each other such that they can be detached and act as a seal.

(5) The upper pump housing section 6 is simultaneously designed as the base of a motor housing 9, in which the electric motor 2 is arranged.

(6) The electric motor 2 comprises a stator 10 and a rotor 11. A number of permanent magnets are arranged in rotor 11. In an area of a second end of the shaft 8, it is attached in a torque proof manner to said shaft at a distance from the bucket wheel 7. The stator 10 radially surrounds the rotor 11 forming a close gap 12. One width of the gap 12 amounts to, for example, 1 mm and essentially corresponds to a magnetic air gap of an electric motor 2.

(7) The stator 10 comprises a number of stator laminations 13 and of coils 14. With the exception of the front sides 15 of the stator laminations 13 facing the rotor 11, the stator 10 is completely coated with a plastic. This coating serves at the same time as a mounting for the stator 10 in the motor housing, as a cover for the motor housing and as a holder for the activation device 3.

(8) The front sides 15 of the stator laminations 13 facing the rotor 11 are electroplated with a thin layer that cannot be seen from FIG. 1. The layer has a thickness of several μm, e.g. 10 μm to 30 μm.

(9) The pump chamber 1 and the interior of the motor housing 9 are hydraulically connected to each other in such a way that during operating of the pump, the electric motor 2 and, in this case the stator 10 in particular, is immersed in the fluid to be transported and is thus cooled. In this respect, the coatings are reliable protection against corrosion without significantly increasing the size of a magnetic air gap and thus negatively impacting the electrical efficiency of the electric motor 2.

(10) The activation device 3 is arranged in the holder that is formed in the coating of the stator 10 axially opposite the suction port 5 and to be waterproof towards the interior of the motor housing 9. The activation device 3 comprises a printed circuit board 16 and electric/electronic components and is electrically connected firstly with the stator 10 and secondly with the vehicle's onboard electronics via a plug connection.

LIST OF REFERENCE NUMBERS

(11) 1 Pump chamber 2 Electric motor 3 Activation device 4 Lower pump housing section 5 Suction port 6 Upper pump housing section 7 Bucket wheel 8 Shaft 9 Motor housing 10 Stator 11 Rotor 12 Gap 13 Stator laminations 14 Coil 15 Front side 16 Printed circuit board