US 9,810,232 B2
Pump unit
Finn Mathiesen Høj, Aarhus N (DK)
Assigned to GRUNDFOS HOLDING A/S, Bjerringbro (DK)
Appl. No. 14/368,993
Filed by GRUNDFOS HOLDING A/S, Bjerringbro (DK)
PCT Filed Dec. 14, 2012, PCT No. PCT/EP2012/075510
§ 371(c)(1), (2) Date Jun. 26, 2014,
PCT Pub. No. WO2013/098093, PCT Pub. Date Jul. 4, 2013.
Claims priority of application No. 11195803 (EP), filed on Dec. 27, 2011.
Prior Publication US 2014/0377103 A1, Dec. 25, 2014
Int. Cl. F04D 29/08 (2006.01); F04D 13/06 (2006.01)
CPC F04D 29/086 (2013.01) [F04D 13/0606 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A pump assembly comprising:
a stator housing comprising a longitudinal axis, an inside and a stator housing end portion surface at an axial end of the stator housing, the stator housing end portion surface extending in a radial direction with respect to the longitudinal axis;
a wet-running electric motor with a can arranged in the stator housing inside;
a pump housing connected to the stator housing; and
an annular shaped seal arranged between the stator housing and a radial collar of the can, and the pump housing, the annular shaped seal comprising a shaped seal side facing away from the pump housing, the shaped seal side being in contact with the can and the stator housing end portion surface, wherein at least one of:
in predetermined peripheral sections, free spaces are present between the inner periphery of the shaped seal and a radially inwardly oppositely lying wall of the can; and
in predetermined peripheral sections, free spaces are present between the outer periphery of the shaped seal and a radially outwardly oppositely lying wall of the pump housing,
wherein said free spaces are designed in a manner such that the shaped seal can expand into the free spaces with an axial compression.