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AssigneeSchwarzer Precision GmbH & Co. KG
InventorsMarcus Schwarzer, Heiko Hoffmann
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What is illustrated and described is a pump assembly (1) for a pump, particularly for a miniature pump, with an electric motor (2) and with a housing unit (3), wherein the electric motor (2) has a motor shaft (5) passing freely through a motor housing of the electric motor (2) and the motor housing is connected to the housing unit (3), and wherein the motor shaft (5) is supported in the motor housing with an axial shaft play. According to the invention, at least one stabilizing element (6, 13, 14, 16) arranged outside of the motor housing is provided in order to reduce or eliminate the axial play of the motor shaft (5), with an axial compressive force or axial tensile force acting on the motor shaft (3) being applied by the stabilizing element (6, 13, 14, 16) to the motor shaft (5).
An eccentric diaphragm pump with a diaphragm and a pump assembly, wherein the pump assembly comprises an electric motor and a housing unit, wherein the electric motor has a motor shaft passing freely through a motor housing of the electric motor and the motor housing is connected to the housing unit, and wherein the motor shaft is supported in the motor housing with an axial shaft play, wherein the electric motor with motor shaft and motor housing forms an independent structural unit, wherein a majority of the motor shaft extends within the motor housing, but one freestanding shaft end of the motor shaft is passed through an outer wall or front side of the motor housing into an interior space of the housing unit, so that the freestanding shaft end of the motor shaft is completely enclosed by the housing unit, wherein the motor shaft is connected to an eccentric within the housing in a torque-proof manner, wherein the eccentric is also connected by a ball bearing to a connecting rod in order to establish a connection to the diaphragm and to ensure pump function, wherein at least one stabilizing element arranged outside of the motor housing is provided in order to reduce or to eliminate the axial shaft play of the motor shaft, wherein an axial compressive force or axial tensile force acting on the motor shaft is applied by the at least one stabilizing element to the motor shaft, wherein the at least one stabilizing element is provided so that it is fastened in the housing unit, wherein the at least one stabilizing element is arranged in a housing part of the housing unit and wherein a first portion of the at least one stabilizing element is fixed by the housing part in an orientation axially opposite from the freestanding shaft end of the motor shaft.
A method for reducing or eliminating vibrations and/or noises in eccentric diaphragm pumps, comprising a diaphragm and a pump assembly with an electric motor and with a housing unit, wherein the electric motor has a motor shaft passing freely through a motor housing of the electric motor and the motor housing is connected to the housing unit, and wherein the motor shaft is supported in the motor housing with an axial shaft play, wherein the electric motor with motor shaft and motor housing forms an independent structural unit, wherein a majority of the motor shaft extends within the motor housing, but one freestanding shaft end of the motor shaft is passed through an outer wall or front side of the motor housing into an interior space of the housing unit, so that the freestanding shaft end of the motor shaft is completely enclosed by the housing unit, wherein the motor shaft is connected to an eccentric within the housing in a torque-proof manner, wherein the eccentric is also connected by a ball bearing to a connecting rod in order to establish a connection to the diaphragm and to ensure to pump function, wherein the method includes the step of providing an axial compressive force or axial tensile force from outside of the motor housing on the motor shaft with at least one stabilizing element in order to reduce or eliminate the axial shaft play, wherein the at least one stabilizing element is provided so that it is fastened in the housing unit, wherein a first portion of the at least one stabilizing element is arranged in a housing part of the housing unit and wherein the at least one stabilizing element is fixed by the housing part in an orientation axially opposite from the freestanding shaft end of the motor shaft.
A diaphragm pump with a diaphragm and a pump assembly, wherein the pump assembly comprises an electric motor and a housing unit, wherein the electric motor has a motor shaft passing freely through a motor housing of the electric motor and the motor housing is connected to the housing unit, and wherein the motor shaft is supported in the motor housing with an axial shaft play, wherein the electric motor with the motor shaft and motor housing forms an independent structural unit, wherein a majority of the motor shaft extends within the motor housing, but one freestanding shaft end of the motor shaft is passed through an outer wall or front side of the motor housing into an interior space of the housing unit, so that the freestanding shaft end of the motor shaft is completely enclosed by the housing unit, wherein the diaphragm is driven by the motor shaft within the housing unit in order to ensure pump function, wherein at least one stabilizing element arranged outside of the motor housing is provided in order to reduce or to eliminate the axial shaft play of the motor shaft, wherein an axial compressive force or axial tensile force acting on the motor shaft is applied by the at least one stabilizing element to the motor shaft, wherein the at least one stabilizing element is provided so that it is fastened in the housing unit, wherein the at least one stabilizing element is arranged in a housing part of the housing unit and wherein a first portion of the at least one stabilizing element is fixed by the housing part in an orientation axially opposite from the freestanding shaft end of the motor shaft.
Dependencies are inferred from the claim text.