Patent ID: 9702477
Date: 2017-07-11
CPC Classifications: F16K,H01F

Claim:
1. An electric coaxial valve having increased magnetic force capability through the applicability of two poles, comprising in combination; a housing with an inlet and outlet for the flow of a medium; a first and a second pole piece to provide a magnetic force proportional to the two pole face areas; a third and a fourth pole piece rigidly connected to or integral with the housing and interposed centrally in the housing as determined by reference to the axis; a valve seat integral with the housing and relatively proximal to a second gap and relatively distal from a first gap; a tube for cooperating with the valve seat to alternatively prevent (close) or permit (open) the flow of the medium from the inlet to the outlet; the tube having first and second ends relatively proximal to the inlet and outlet of the housing, respectively; an armature rigidly attached and circumscribing the exterior of the tube, defining a longitudinal axis thereof; the armature containing the first and second pole pieces and being interposed between the third and fourth pole pieces and spaced from the third and fourth pole piece as determined by reference to the axis such that the first gap is formed between the armature and the third pole piece, and the second gap is formed between the armature and the fourth pole piece; a permanent magnet circumscribing the interior of the armature and being interposed centrally between the first and second pole pieces as determined by reference to the axis; the first and second pole pieces carries flux density attributable to the permanent magnet to the first and second gap where the magnetic flux from the first and second pole pieces is closed across the first gap by the third pole piece or across the second gap by the fourth pole piece to provide a magnetic force on the armature toward and against the third or fourth pole piece; where when the second gap is narrower than the first gap, the flux density attributable to the permanent magnet across the first and second pole pieces and toward the fourth pole piece is greater in the second gap than in the first gap; the second gap being further narrowed and the first gap correspondingly widened when the armature is thus subjected to the magnetic force originating from the magnet; where when the first gap is narrower than the second gap, the flux density attributable to the permanent magnet across the first and second pole pieces and toward the third pole piece is greater in the first gap than in the second gap; the first gap being further narrowed and the second gap correspondingly widened when the armature is thus subjected to the magnetic force originating from the magnet; where when the armature is abutted to the third or fourth pole piece the flux density attributable to the permanent magnet provides a magnetic latching force between the armature and the third or fourth pole piece greater than the magnetic force on the armature across the first or second gap; an electromagnetic means circumscribing the interior of the armature and being interposed between the first and second pole pieces as determined by reference to the axis for cooperating with the permanent magnet to move the tube in response to a first current; the electromagnetic means having one or more coils wound, to receive a first current to increase flux density in the first gap and simultaneously decrease flux density in the second gap, and alternately, to receive a second current to increase flux density in the second gap and simultaneously decrease flux density in the first gap sufficiently; wherein with the armature magnetically latched to the fourth pole piece, the electromagnetic means being operable by the first current to release the magnetic force on the armature; the armature moving away from the fourth pole piece and toward the third pole piece a distance which renders the first gap narrower than the second gap to magnetically latch the armature to the third pole piece while maintaining a clearance between the armature and the fourth pole piece; simultaneously the tube moving with the armature away from the valve seat to open the valve and permit flow; wherein with the armature magnetically latched to the third pole piece, the electromagnetic means being operable by the second current to release the magnetic force on the armature; the armature moving away from the third pole piece and toward the fourth pole piece a distance which renders the second gap narrower than the first gap to magnetically latch the armature to the fourth pole piece while maintaining a clearance between the armature and the third pole piece; simultaneously the tube moving with the armature toward and into abutment with the valve seat to close the valve and stop flow.