Domestic appliance
A domestic appliance, in particular a beverage dispenser machine, with a beverage pump having at least one pole sleeve for conducting a magnetic flux generated by a magnetic actuator, wherein the pole sleeve has, along a main flow direction of the liquid, a substantially changing magnetic permeability, wherein the pole sleeve has a reduced magnetic permeability in an axial edge region.
1. A domestic appliance, comprising:
a beverage pump configured to convey a liquid, the beverage pump comprises a magnetic actuator, a working piston, a pump chamber in which the working piston is guided, and a pole sleeve for conducting a magnetic flux generated by the magnetic actuator, wherein
the pole sleeve has, along a main flow direction of the liquid, a substantially changing magnetic permeability, and the pole sleeve has a reduced magnetic permeability in an axial edge region.
2. The domestic appliance according to claim 1 , wherein the pole sleeve has a reduced effective wall material volume in its axial edge region.
3. The domestic appliance according to claim 1 , wherein the axial edge region of the pole sleeve is embodied in a sinuate manner.
4. The domestic appliance according to claim 1 , wherein the pole sleeve has a reduced wall thickness in the axial edge region.
5. The domestic appliance according to claim 1 , wherein the pole sleeve has a basis wall thickness with respect to which the wall thickness is reduced in the axial edge region.
6. The domestic appliance according to claim 1 , wherein the beverage pump comprises at least one further pole sleeve, which is arranged in such a way that it is spaced apart from the pole sleeve by a gap.
7. The domestic appliance according to claim 1 , wherein the pole sleeve has an axial section profile derived from a force-displacement characteristic.
8. The domestic appliance according to claim 7 , wherein the axial section profile comprises at least one slope and/or a multiple stepping.
9. The domestic appliance at least according to claim 7 , wherein the axial section profile comprises at least one slope, which includes an angle of no more than 30 degrees with a middle axis of the pole sleeve.
10. The domestic appliance at least according to claim 7 , wherein the axial section profile comprises at least one section having a constant reduced wall thickness and having an axial extension of at least 2 mm.
11. The domestic appliance at least according to claim 7 , wherein the axial section profile comprises at least one step, which has a height of at least 0.2 mm.
12. The domestic appliance at least according to claim 7 , wherein the axial section profile comprises at least one step on an inner perimeter.
13. The domestic appliance according to claim 1 , wherein the axial edge region has an axial extension with a value of at least 2 mm.
14. The domestic appliance according to claim 1 , wherein the axial edge region has an axial extension with a value of maximally 10 mm.
15. The domestic appliance according to claim 1 , wherein the pole sleeve has a constant inner diameter at least in the axial edge region.
16. The domestic appliance according to claim 1 , further comprising
a pump chamber wall that defines the pump chamber, wherein
the pole sleeve surrounds the pump chamber wall to encompass the pump chamber.
17. The domestic appliance according to claim 16 , wherein the pump chamber wall is a piston guidance.
18. The domestic appliance according to claim 1 , wherein the pole sleeve is arranged outside the pump chamber, which is defined by a pump chamber wall, wherein the pole sleeve abuts the pump chamber wall.