Abstract A magnetic drive for a fluid pump particularly adapted to pump a refrigerant solution in which the liquid circuit includes a casing for the pump and the drive including a rotatable block of magnetically hard metal such as ALNICO positioned adjacent to and exteriorly of the casing. A rotatable permanent first magnet is positioned exteriorly of the casing but adjacent the hard metal to provide a hysteresis coupling between the magnetically hard material and the first magnet. A rotatable permanent second magnet inside the casing is spaced from the first magnet to provide a synchronous coupling between the first and second magnets. Movable pump-operating means are attached to the second magnet for providing a fluid-pumping action on rotation of the second magnet. Drive means are provided for rotating the magnetically hard metal, thereby rotating said first magnet by reason of the hysteresis coupling and the second magnet by reason of the synchronous coupling between the two magnets. With this arrangement the magnetically hard metal and the first magnet may be located very close to each other for maximum strength of their coupling, while the two permanent magnets may be spaced further apart so that one may be located on the interior of the pump casing and the other on the exterior.
A magnetic drive for a fluid pump within a fluid-containing casing comprising: a rotatable block of magnetically hard metal adjacent to and exteriorly of said casing; a rotatable permanent first magnet adjacent said hard metal providing a hysteresis coupling between said metal and first magnet; a rotatable permanent second magnet inside said casing spaced from said first magnet providing a synchronous coupling therebetween; movable pump-operating means operatively attached to said second magnet for providing a fluid-pumping action on rotation of said second magnet; and means for rotating said magnetically hard metal, thereby rotating said first magnet by reason of said hysteresis coupling and said second magnet by reason of said synchronous coupling to operate said pump.
Claim 2
Dependent Claim
116 words
A magnetic drive for a fluid pump within a fluid-containing casing comprising: a rotatable block of magnetically hard metal adjacent to and exteriorly of said casing; a rotatable permanent first magnet adjacent said hard metal providing a hysteresis coupling between said metal and first magnet; a rotatable permanent second magnet inside said casing spaced from said first magnet providing a synchronous coupling therebetween; movable pump-operating means operatively attached to said second magnet for providing a fluid-pumping action on rotation of said second magnet; and means for rotating said magnetically hard metal, thereby rotating said first magnet by reason of said hysteresis coupling and said second magnet by reason of said synchronous coupling to operate said pump.
Claim 3
Dependent Claim
21 words
The magnetic drive of claim 1 wherein said pump is in a refrigeration system and said fluid comprises a liquid refrigerant.
Claim 4
Dependent Claim
23 words
The magnetic drive of claim 2 wherein said hard metal block and first and second magnets are circular and coaxial with each other.
Claim 5
Dependent Claim
19 words
The magnetic drive of claim 3 wherein said hard metal and magnets are coaxial with said means for rotating.