System for adapting foot spas for use with disposable pumps
A system for use with a spa adapted for use with a pump having a drive hub. The system comprises an adapter and a disposable pump. The adapter: has a housing defining a recess, a rotor in the recess and an operative position; and is adapted, when operatively positioned: for rotation of the rotor upon rotation of the drive hub. The disposable pump has: a housing having a pair of sides and a void, one of the sides defining an intake and a port, the intake communicating with a center of the void and the port communicating with a void periphery; an impeller in the void; and an operative position adjacent the adapter. The disposable pump is adapted, when operatively positioned, for rotation upon rotation of the drive hub and consequent rotation of the rotor, to draw water through the intake and eject water through the one or more ports.
1 . A system comprising
a disposable pump for use with a foot spa, the disposable pump comprising:
a housing having a pair of sides formed of a non-ferromagnetic material and defining a void having a center and a periphery, one of the pair of sides defining an intake and one or more ports, the intake communicating with the center of the void and the ports communicating with the periphery; and
an impeller in the void wherein the impeller includes a portion that is ferromagnetic and a portion that is non-ferromagnetic, the portions being axially displaced from the other;
wherein the pump is configured to be disposed in a foot spa basin by a releasable magnetic engagement with an adapter such that upon rotation of a drive hub positioned outside of the foot spa basin and consequent rotation of a rotor positioned within the adapter, the impeller rotates to draw water through the intake and eject water through the one or more ports; and,
wherein the rotor positioned within a housing of the adapter has a rotation axis and comprises:
a pair of magnetic layers disposed in parallel relation to one another and such that a rotation axis passes centrally through each magnetic layer and in perpendicular relation thereto; and
a rotor ferromagnetic layer between the magnetic layers.
2 . The system according to claim 1 , wherein the impeller is adapted to draw water through the intake and eject water through the one or more ports as aforesaid by flat blades.
3 . The system according to claim 1 , wherein the ferromagnetic portion of the impeller abuts the non-ferromagnetic portion of the impeller at a junction that is circular.
4 . The system according to claim 2 , wherein the ferromagnetic portion of the impeller defines the flat blades.
5 . The system according to claim 1 , wherein the ferromagnetic portion of the impeller is steel.
6 . The system according to claim 1 , wherein the ferromagnetic portion of the impeller is a steel stamping.
7 . The system according to claim 1 , wherein the non-ferromagnetic portion of the impeller is aluminum.
8 . The system according to claim 1 , wherein the ferromagnetic portion of the impeller has a thickness X10, the non-ferromagnetic portion of the impeller has a thickness X11, X10 is between about 0.1 mm and 0.2 mm and X11 is between about 0.9 mm and 2.0 mm.
9 . The system according to claim 8 , wherein the thickness X10 is about 0.15 mm and the thickness X11 is about 2 mm.
10 . The system according to claim 1 , wherein each of the magnetic layers has a plurality of magnetic portions ringing the rotation axis.
11 . The system according to claim 10 , wherein a first magnetic layer of the pair of magnetic layers which, in use, is disposed adjacent the disposable pump, has the same number of magnetic portions as a second magnetic layer of the pair of magnetic layers.
12 . The system according to claim 11 , wherein:
the first magnetic layer of the pair of magnetic layers has a thickness X1;
the second magnetic layer of the pair of magnetic layers has a thickness X2;
the rotor ferromagnetic layer has a thickness X3;
the housing of the adapter has a pair of walls orientated perpendicular to the rotation axis,
the walls having respective thicknesses X4 and X5; and
the rotor is disposed in spaced relation to the housing of the adapter such that spaces between the magnetic layers and the housing are X6 and X7.
13 . The system according to claim 12 , wherein:
X1 is about 3 mm;
X2 is about 3 mm;
X3 is about 1.6 mm;
X4 is about 1 mm;
X5 is about 1 mm;
X6 is about 1 mm; and
X7 is about 1 mm.
14 . The system according to claim 13 , wherein the rotor ferromagnetic layer is iron and the walls are plastic.