Actuating device for a pump unit

Patent metadata

Field	Value
Publication number	US-2016102715-A1
Application number	US-201414894190-A
Country	US
Kind code	A1
Filing date	May 6, 2014
Priority date	May 31, 2013
Publication date	Apr 14, 2016
Grant date	—

Abstract

An actuation device for a pump assembly such as for application in a can of a pump assembly for force impingement of a shaft situated in the can. The device includes a carrier for connection to the can and a passage extending along a longitudinal axis. An actuation pin is led in the passage along a longitudinal axis and has a first axial end including a tool receiver and a an opposite second axial end including an engagement region for force transmission onto a shaft. A spring element is arranged between the actuation pin and the carrier and impinges the actuation pin with a spring force in a first axial end direction. A seal is arranged between the carrier and the actuation pin, in a region between the spring element and the second axial end. A pump assembly with such an actuation device is also provided.

First claim

1 . An actuation device for a pump assembly for application in a can of a pump assembly for force impingement of a shaft situated in the can, the actuation device comprising:
a carrier for connection to the can, the carrier comprising a passage extending along a longitudinal axis; an actuation pin led in the passage along a passage longitudinal axis and which actuation pin has a first axial end that comprises a tool receiver and an opposite second axial end that comprises an engagement region for force transmission onto a shaft; a spring element arranged between the actuation pin and the carrier and acting on the actuation pin in a first axial end direction with a spring force; and a seal arranged between the carrier and the actuation pin, in a region between the spring element and the second axial end of the actuation pin.

2 . An actuation device according to claim 1 , wherein the carrier is configured for the sealed connection to a can.

3 . An actuation device according to claim 1 , wherein the carrier is configured for welding to a can and comprises a peripheral collar for receiving a weld seam.

4 . An actuation device according to claim 1 , wherein the actuation pin at the first axial end comprises a tool receiver configured as a crossed slot.

5 . An actuation device according to claim 1 , wherein the engagement region at the second axial end of the actuation pin has one of a rectangular and a square cross section.

6 . An actuation device according to claim 1 , wherein the seal is fixed in the carrier.

7 . An actuation device according to claim 1 , wherein the carrier seen in the direction of the longitudinal axis comprises an annular carrier disk between the seal and the spring element, on which carrier disk the spring element is supported.

8 . An actuation device according to claim 7 , wherein the carrier disk forms a radially outwardly projecting collar which is configured for receiving at least one weld seam.

9 . An actuation device according to claim 1 , wherein the carrier further comprises a spring housing and the spring element is surrounded by the spring housing at the outer periphery

10 . An actuation device according to claim 9 , wherein the carrier further comprises an annular carrier disk and the spring housing is welded to the carrier disk.

11 . An actuation device according to claim 1 , wherein the carrier further comprises an annular seal housing and the seal is arranged in an inside of the annular seal housing.

12 . An actuation device according to claim 11 , wherein the carrier further comprises an annular carrier disk and the seal housing is welded at a seal housing first axial end to the carrier disk.

13 . An actuation device according to claim 11 , wherein the carrier further comprises a spring housing and the spring housing is situated at a first side of the carrier disk, and the seal housing is situated at an opposite second side of the carrier disk.

14 . An actuation device according to claim 12 , wherein the annular seal housing at a seal housing second axial end comprises a radially inwardly directed collar having an inner diameter that is smaller than an outer diameter of the seal.

15 . An actuation device according to claim 7 , the carrier further comprises a spring housing and an annular seal housing and at least one of the carrier disk, the spring housing and the seal housing is formed from sheet metal.

16 . An actuation device according to claim 1 , wherein the carrier further comprises a seal housing surrounding the seal and configured as one piece with a can or formed by a part of the can.

17 . An actuation device according to claim 1 , wherein the seal is configured as a sealing ring with such a cross section, that the inner periphery of the seal has a shorter axial length than an axial length at the outer periphery.

18 . A pump assembly comprising:
can; a drive shaft of the pump assembly arranged inside the can; an actuation device arranged in an axial face side of the can the actuation device comprising: a carrier for connection to the can, the carrier comprising a passage extending along a longitudinal axis; an actuation pin led in the passage along a passage longitudinal axis and which actuation pin has a first axial end that comprises a tool receiver and an opposite second axial end that comprises an engagement region for force transmission onto a shaft; a spring element arranged between the actuation pin and the carrier and acting on the actuation pin in a first axial end direction with a spring force; and a seal arranged between the carrier and the actuation pin, in a region between the spring element and the second axial end of the actuation pin.

19 . A pump assembly according to claim 18 , further comprising:
an electric drive motor comprising a rotor and a stator, wherein the can is arranged between the rotor and the stator, and an electronics housing applied onto an axial end of the drive motor, said electronics housing comprising a channel which extends through the electronics housing in the axial direction, lies opposite the actuation device and has a cross section that is adapted to a cross section of a tool to be received and able to be brought into engagement with the tool receiver.

20 . A pump assembly according to claim 18 , wherein the carrier comprises:
an annular carrier disk between the seal and the spring element, on which carrier disk the spring element is supported; a spring housing; and an annular seal housing.

Assignees

• Grundfos Holding As

Inventors

• Nielsen Tonny Ring
• Kjaer Oluf
• Rasmussen Troels Holtum

Classifications

• F04D29/26

  Rotors specially for elastic fluids · CPC title

• F04D29/046

  Bearings · CPC title

• F04D25/06

  the pump being electrically driven (F04D25/08 takes precedence) · CPC title

• F04D29/053

  Shafts · CPC title

• F04D29/043

  Shafts · CPC title