Pump assembly

Inactive Publication Date: 2020-06-18
GRUNDFOS HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is about a pump that is smaller and more portable than existing pumps. This allows it to be used in a more limited space.

Problems solved by technology

The large rotor can require significant lateral space.
However, the larger the gap between the impeller and the neck ring is, the more fluid escapes from the high-pressure chamber directly back through the gap to the low-pressure chamber, which costs pumping efficiency.

Method used

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Embodiment Construction

[0061]Referring to the drawings, FIGS. 1 to 19 show embodiments of a pump assembly 1 with a centrifugal pump unit 2, an input port 3 and an output port 5, wherein the input port 3 and an output port 5 are coaxially arranged on a pipe axis F on opposing sides of the pump unit 2. The input port 3 and the output port 5 comprise connector flanges 7, 9 for a connection to pipes (not shown). The pump unit 2 comprises a rotor axis R essentially perpendicular to the pipe axis F. It should be noted that the terms “radial”, “circumferential”, “angular” and “axial” throughout this disclosure are to be understood with reference to the rotor axis R. A pump housing 11 of the pump unit 2 is arranged between the input port 3 and the output port 5. The pump housing 11 comprises an impeller 12 (see FIGS. 3, 4 and 8a,b) for rotating counter-clockwise around the rotor axis R and pumping fluid from the input port 3 to the output port 5. The impeller 12 is driven counter-clockwise by a three-phase synchr...

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Abstract

A pump assembly (1) includes a rotor axle (45), an impeller (12) fixed to the rotor axle, and a pump housing (11) accommodating the impeller and defining a radial inner reference surface (71). A drive motor includes a stator (17) and a rotor (51). The rotor is fixed to the rotor axle for driving the impeller. A rotor can (57) accommodates the rotor and includes a rotor can flange (63). A stator housing (13) accommodates the stator. A radial bearing ring (47) is in sliding contact with the rotor axle. A bearing retainer (41) engages the radial bearing ring and centers the radial bearing ring with respect to the radial inner reference surface. The rotor can flange has a radial distance to the pump housing. The rotor can includes a radial inner centering surface (65) centered by radially abutting against a radial outer centering surface (67) of the bearing retainer.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of priority under 35 U.S.C. § 119 of European Application 18 212 325. 7, filed Dec. 13, 2018, the entire contents of which are incorporated herein by reference.TECHNICAL FIELD[0002]The present disclosure relates generally to pump assemblies, in particular to speed controlled wet rotor pumps. Such pumps in the power range of 5 W to 3 kW are typically used as circulation pumps of house heating systems.TECHNICAL BACKGROUND[0003]Wet rotor pumps usually comprise a rotor can separating a permanent magnet rotor from a stator. The rotor drives an impeller located in a pump housing. Typically, a motor housing is fastened to the pump housing, wherein the rotor can and the stator are attached to the pump housing by the fastener of the motor housing.[0004]EP 2 072 828 A1 describes a wet rotor centrifugal pump as a circulation pump for house heating systems. The pump disclosed therein has a compact design by locatin...

Claims

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Application Information

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IPC IPC(8): F04D29/42F04D25/06F04D29/046F04D29/043
CPCF04D25/06F04D29/046F04D29/043F04D29/426F04D13/0606F04D13/064F04D29/0462F04D29/628F04D13/0626F04D13/0633
InventorSVARRE, ERIK BUNDESENPLOUGMANN, JANDAMM, THERKELAARESTRUP, JAN CARØEKRAGELUND, KLAUS VESTERGAARDSVARRE, MORTEN LIENGAARD
OwnerGRUNDFOS HLDG