Actuator for a fluid valve
First Claim
1. An actuator for actuating a valve in a fluid system, the actuator comprising a closed housing shell made of a magnetically conductive material, circumscribing a central axis and containing a non-magnetic fluid medium, a coil support having an actuation projection and being axially displaceable within the fluid in the housing shell and forming a first air gap with respect to the shell, with at least one current-carrying coil wound onto the circumference of the coil support and extending along a predetermined axial extent of the support, and with a cylindrical magnet tube enclosed by the coil support and forming a second air gap with respect to the support, with a sequence of a permanent magnet and a pole disk made of a magnetically conductive material arranged axially in the tube'"'"'s interior, wherein the axial extent of the coil is greater than the axial extension of the pole disk associated with the coil, and the dimensions of the permanent magnet and the pole disk correspond to one another such that i) the end face cross-sectional area of the permanent magnet corresponds to at least the circumferential surface of the pole disk;
- and ii) the axial extent of the coil associated with the pole disk overlaps the axial extension of the pole disk by the stroke amplitude of the coil support, wherein the width of the second air gap between the coil support and the cylindrical magnet tube is sufficient such that a laminar lubricating film is established between the cylindrical magnet tube and coil support without displacing fluid surrounding the coil support when the coil support is displaced.
3 Assignments
0 Petitions
Accused Products
Abstract
The invention relates to an actuator for actuating a valve installed in a hydraulic or compressed air system comprising a coil support which can be displaced by means of air space induction in a magnetically conducting housing on a magnetic cylinder composed of a permanent magnet and a cylinder pole disk. The invention is characterized in that the dimensions of the permanent magnet and the pole disk correspond to each other in such a way that the diameter of the front surface of the permanent magnet is at least the same size as the circumferential surface of a neighboring pole disk and that the width of the coil associated with the pole disk exceeds the width of the pole disk by the lift amplitude of the coil support. According to the invention, the actuator for actuating a valve used in fluidic engineering is disposed in such a way that the coil support is displaceable in a fluidic medium and the air gap arranged between the coil support and a magnetic cylinder pipe surrounding the permanent magnet and the associated pole disk has a maximum width whereby a laminated lubricating film is formed without displacing the surrounding fluid.
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Citations
35 Claims
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1. An actuator for actuating a valve in a fluid system, the actuator comprising a closed housing shell made of a magnetically conductive material, circumscribing a central axis and containing a non-magnetic fluid medium, a coil support having an actuation projection and being axially displaceable within the fluid in the housing shell and forming a first air gap with respect to the shell, with at least one current-carrying coil wound onto the circumference of the coil support and extending along a predetermined axial extent of the support, and with a cylindrical magnet tube enclosed by the coil support and forming a second air gap with respect to the support, with a sequence of a permanent magnet and a pole disk made of a magnetically conductive material arranged axially in the tube'"'"'s interior, wherein the axial extent of the coil is greater than the axial extension of the pole disk associated with the coil, and the dimensions of the permanent magnet and the pole disk correspond to one another such that i) the end face cross-sectional area of the permanent magnet corresponds to at least the circumferential surface of the pole disk;
- and ii) the axial extent of the coil associated with the pole disk overlaps the axial extension of the pole disk by the stroke amplitude of the coil support, wherein the width of the second air gap between the coil support and the cylindrical magnet tube is sufficient such that a laminar lubricating film is established between the cylindrical magnet tube and coil support without displacing fluid surrounding the coil support when the coil support is displaced.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- 12. An actuator for actuating a valve comprising a housing shell of a magnetically conductive material circumscribing a central axis, a coil support with an actuation projection and displaceable within the housing shell while forming a first air gap with respect thereto, with at least one current-carrying coil wound onto the circumference of the coil support along an axial extent thereof, and a cylindrical magnet tube enclosed by the coil support and forming a second air gap with respect thereto, with a sequence of one or more permanent magnets and one or more pole disks made of a magnetically conductive material arranged axially in the tube'"'"'s interior, with each pole disk having an associated coil, wherein the axial extent of the coil is greater than the axial extension of a pole disk associated with the coil, and wherein on each end of the cylindrical magnet tube formed by an outer pole disk of a magnet module, with the magnet module comprising a permanent magnet centrally located between two outer pole disks, an edge magnet is arranged and conductively coupled directly with an associated pole disk, whose strength is adjusted to compensate for the magnetic leakage flux occurring at the ends of the cylindrical magnet tube, and is connected with the housing shell.
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27. An actuator for actuating a valve in a fluid system, the actuator comprising a closed housing shell made of a magnetically conductive material, circumscribing a central axis and containing a non-magnetic fluid medium, an annular non-conductive coil support having an actuation projection at one end and being axially displaceable through a stroke amplitude within the fluid in the housing shell and forming a first annular gap with respect to the shell, with at least one current-carrying coil winding circumferentially supported by the coil support, and with an annular magnet tube enclosed by the coil support and forming a second gap with respect to the coil support along an axial extent thereof, with a sequence of a permanent magnet and a pole disk made of a magnetically conductive material arranged axially in the tube'"'"'s interior, wherein the axial extent of the coil is greater than the axial extension of the pole disk, and the dimensions of the permanent magnet and the pole disk correspond to one another such that i) the end face cross-sectional area of the permanent magnet corresponds to at least the circumferential surface of the pole disk;
- and ii) the axial extent of the coil overlaps the axial extension of the pole disk by the stroke amplitude of the coil support, and wherein the width of the second gap between the coil support and the magnet tube is sufficient such that a laminar lubricating film is established in the second annular gap between the coil support and magnet tube.
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28. An actuator for actuating a valve in a fluid system, the actuator comprising a closed housing shell made of a magnetically conductive material, circumscribing a central axis and containing a non-magnetic fluid medium, an annular non-conductive coil support having an actuation projection at one end and being axially displaceable through a stroke amplitude within the fluid in the housing shell and forming a first annular gap with respect to the shell, with at least one current-carrying coil winding circumferentially supported by the coil support along an axial extent thereof, and with a magnet module, including a sequence of at least one pole disk made of magnetically conductive material and a permanent magnet, enclosed by the coil support and forming a second gap with respect to the coil support, wherein the axial extent of the coil is greater than the axial extension of the pole disk, and the dimensions of the permanent magnet and the pole disk correspond to one another such that i) the end face cross-sectional area of the permanent magnet corresponds to at least the circumferential surface of the pole disk;
- and ii) the axial extent of the coil is greater than the axial extension of the pole disk by no more than the stroke amplitude of the coil support, and wherein the width of the second gap between the coil support and the magnet module is sufficient such that a laminar lubricating film is established in the second annular gap between the coil support and magnet module.
- 32. An actuator for actuating a valve comprising a housing shell of a magnetically conductive material circumscribing a central axis, a coil support with an actuation projection and displaceable within the housing shell while forming a first air gap with respect thereto, with at least one current-carrying coil wound onto the circumference of the coil support along an axial extent thereof, and a cylindrical magnet enclosed by the coil support and forming a second air gap with respect thereto, with a sequence of one or more permanent magnets and one or more pole disks made of a magnetically conductive material arranged axially in the tube'"'"'s interior, with each pole disk having an associated coil, wherein the axial extent of the coil is greater than the axial extension of a pole disk associated with the coil, and wherein on each end of the cylindrical magnet tube formed by an outer pole disk of a magnet module, with the magnet module comprising a permanent magnet centrally located between two outer pole disks, an edge magnet is arranged and is conductively coupled directly to the associated pole disk, whose strength is adjusted to compensate for magnetic leakage flux occurring at the ends of the cylindrical magnet tube, and is directly magnetically coupled with the housing shell.
Specification