EP3179488A1 - A magnetic circuit switching device with single-sided attraction - Google Patents
A magnetic circuit switching device with single-sided attraction Download PDFInfo
- Publication number
- EP3179488A1 EP3179488A1 EP15198358.2A EP15198358A EP3179488A1 EP 3179488 A1 EP3179488 A1 EP 3179488A1 EP 15198358 A EP15198358 A EP 15198358A EP 3179488 A1 EP3179488 A1 EP 3179488A1
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- European Patent Office
- Prior art keywords
- iron core
- magnetic
- attraction
- magnetic pole
- coil
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 125
- 230000004075 alteration Effects 0.000 claims abstract description 6
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 230000005611 electricity Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 9
- 230000007547 defect Effects 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005426 magnetic field effect Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/121—Guiding or setting position of armatures, e.g. retaining armatures in their end position
- H01F7/122—Guiding or setting position of armatures, e.g. retaining armatures in their end position by permanent magnets
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/16—Rectilinearly-movable armatures
- H01F7/1607—Armatures entering the winding
- H01F7/1615—Armatures or stationary parts of magnetic circuit having permanent magnet
Definitions
- the present invention relates to a magnetic circuit switching device with single-sided attraction, particularly to one that has two magnetic circuits and a single-sided attraction structure for a displaceable iron core to have a wider stretching range in operation.
- a conventional solenoid valve attracts an iron core thereof by a magnetic force produced by an energized coil to open a valve port thereof.
- such solenoid valve has to keep energizing the coil to attract the iron core aside and keep a fixed position of the iron core, so as to keep the valve port opened. Therefore, it needs a great amount of power supply, and the solenoid valve would be overheated and burned by a short circuit after continuous operation.
- FIGS. 1A and 1B The structure of a magnetic power apparatus 100 is illustrated in FIGS. 1A and 1B , including an outer shell 101, a coil 102, an iron core 103, a permanent magnet 104, a left attraction surface 105, and a right attraction surface 106.
- the coil 102 When the coil 102 is energized, the iron core 103 displaces leftwards or rightwards due to the magnetic force from the coil 102 or the permanent magnetic 104.
- Such structure has both sides to fixedly keep the position of the iron core 103 in operation by the permanent magnet 104, so it does not need continuous electricity supply, thus being energy-saving and preventing the invention from overheating and burning by a short circuit.
- the safety and durability are therefore ensured in the improved structure.
- the stretching range D of the iron core 103 is restricted due to the double sided fixing position; that is, the right attraction surface 106 is a closed structure 107. If the stretching range D is design to be 5mm, the iron core 103 can only displaces exactly 5mm, shorter or further is impossible. In this case, when an applied device (not shown) has deviation or wear and tear, the operation would be affected.
- the design is the permanent magnet 104 in a column shape with the iron core 103 disposed around the permanent magnet 104 as shown in FIGS. 1A and 1B , or the design is the permanent magnet 104 in a ring shape with the iron core 103 disposed in-between a plurality of permanent magnets 104 as shown in FIG. 5 and 6 in the US Patent No. 6,246,131 , the defect would affect the operation.
- the inventor has devoted to improving the restriction defect of the stretching range of the iron core 103.
- a primary object of the present invention is to provide a magnetic circuit switching device with single-sided attraction that has a magnetic path alteration function and an elastic force from a spring to keep an iron core in a pre-determined position, also enabling the iron core to have a wider stretching range for operation, increasing the possibilities of wider application and ensuring in-time adjusting in case of deviation and wear and tear of the device.
- Another object of the present invention is to provide a magnetic circuit switching device with single-sided attraction that is able to change a normal position of the iron core with less power supply for operation, thus achieving an energy-saving effect.
- the present invention comprises a housing, a driving circuit, a permanent magnet, a nonconductive axial tube, and a spring according to the annexed claim 1; whereby a magnetic path of the coil starts from the first type magnetic pole to the iron core, the second side, and then the second type magnetic pole when the coil is not energized, forming an outward magnetic circuit to provide a magnetic force for the iron core to displace rightwards with the spring providing an elastic force for the displacement as well, so that the iron core is kept in a position near the right; and when the driving circuit outputting an impulse voltage, the coil is energized, and a magnetic force produced thereby is greater than the magnetic force of the permanent magnet, therefore switching the magnetic path into a path starting from the first type magnetic pole to the iron core, the attraction surface, the first side, the housing, the second side, and then the second type magnetic pole, forming an inward magnetic circuit to force the iron core to displace leftwards and to have the left surface thereof fixedly attracted to the attraction surface for
- the iron core includes a conductive left section and a nonconductive right section to be engaged to form the iron core
- the driving circuit includes an output wire connected to the coil, which outputs a positive impulse voltage when electrified, and outputs a negative impulse voltage when not electrified, so that the coil is able to alter the magnetic path thereby, therefore displacing the iron core and keeping it in a steady position.
- the first type magnetic pole of the permanent magnet is the north pole and the second magnetic pole is the south pole; advantageously, the first type magnetic pole of the permanent magnet further has a magnetic ring.
- the attraction surface is arranged at an end of a column body perpendicularly disposed on an inner side of the first side.
- the column body has an axial through hole arranged therein.
- the second side further connects to a valve which has a chamber arranged at the right side of the iron core and is separately connected to an inlet hole and an outlet hole so that the right surface of the iron core is able to abut on the inlet hole for closure; and the iron core further has a guiding hole connecting the chamber, so as to guide the air flowing back to the chamber to pass through the iron core and the axial through hole of the column body, to be discharged from the first side.
- the present invention has double magnetic circuits with single-sided attraction structure to replace the closed structure design disclosed in US Patent No. 6,246,131 , so as to keep an iron core in a pre-determined position.
- the iron core With a magnetic path alteration function and an elastic force from a spring, the iron core has a wider stretching range for operation, increasing the possibilities of wider application and ensuring in-time adjusting in case of deviation and wear and tear of the device.
- the present invention requires less power for operation, thus achieving an energy-saving effect.
- the present invention includes a housing 10, a driving circuit 40, a permanent magnet 50, a nonconductive axial tube 60, and a spring 70.
- the housing 10 has a coil 20 arranged therein for an iron core 30 to linearly displace within.
- the iron core 20 is at least partially engaged in the coil 20 in normal status.
- the driving circuit 40 is arranged aside the housing 10 to provide an impulse voltage for path altering of a magnetic force, changing a position of the iron core 30, and therefore forming a solenoid magnetic device 90; such structure has been disclosed in the prior art.
- the feature of the present invention lies in that the housing 10 further has a first side 11 and a second side 12 individually arranged at either side thereof, both of which are conductive, and the first side 11 has an attraction surface 13 to attract a left surface 31 of the iron core 30.
- the permanent magnet 50 has a first type magnetic pole 51 and a second type magnetic pole 52 individually arranged at inner and outer side thereof with opposite properties.
- the second type magnetic pole 52 contacts the second side 12 of the housing 10 for operation.
- the first type magnetic pole 51 of the permanent magnet 50 is the north pole and the second magnetic pole 52 is the south pole; and a right section 30R of the iron core 30 is able to pass through an inner periphery of the permanent magnet 50 for operation.
- the iron core 30 is preferred to include a conductive left section 30L and a nonconductive right section 30R to be engaged to form the iron core 30, but the present invention is not limited to such application.
- the iron core 30 is also applicable to be formed in one-piece by conductive materials, but the right section 30R should be arranged with a diameter shorter than the one of the left section 30L to avoid affecting the magnetic path, so that the magnetic path would follow the direction in the unbroken lines shown in FIG. 3C , entering the south pole and exiting from the north pole, then going along the left section 30L of the iron core 30. In short, the magnetic path would not be affected or changed whether the right section 30R of the iron core 30 is made of conductive materials or not.
- the iron core 30 has a right surface 32 arranged at the corresponding side to the left surface 31.
- the left surface 31 and the right surface 32 each has a flat surface arranged thereon for abutment on the attraction surface 13 or a pre-determined position, and the flat surfaces may further have adhesives thereon to ensure a tight and fixed abutment.
- the nonconductive axial tube 60 is arranged for the left section 30L of the iron core 30 to engage; it has an opening 61 at right side thereof extending to the second side 12 of the housing 10 for the right surface 32 of the iron core 30 to be pushed out from the housing 30.
- the spring 70 is arranged around the iron core 30 at a pre-determined position to provide elastic force for the iron core 30.
- the spring 70 is mounted around the right section 30R of the iron core 30 with its inner end abutting on the opening 61 of the axial tube 60 and its outer end abutting on a protruding flange 33 at the right end of the iron core 30, so as to provide elastic force for the iron core 30 to displace rightwards.
- the spring 70 can be arranged between the left surface 31 of the iron core 30 and the attraction surface 13 to provide elastic force with the same effect.
- FIG. 2A whereby a magnetic path of the coil 20 is formed starting from the first type magnetic pole 51 - the north pole - to the iron core 30, the second side 12, and then the second type magnetic pole 52 - the south pole - when the coil 20 is not energized, thus forming an outward magnetic circuit R to provide a magnetic force for the iron core 30 to displace rightwards with the spring 70 providing an elastic force for the displacement as well, so that the iron core 30 is kept in a position near right.
- a feature of the present invention is that the right surface 32 of the iron core 30 is not restricted by a closed side; it can pass through the second side 12. Unlike a conventional device, the iron core 30 of the present invention therefore has a wider stretching range for operation.
- the second side 12 further connects to a valve 80 which has an inlet hole 81; the iron core 30 is able to complement any deviation and wear and tear of the device, ensuring in-time adjusting when the right surface 32 is abutting on the inlet hole 81 during operation.
- the coil 20 when the driving circuit 40 outputs an impulse voltage, the coil 20 is energized and a magnetic force produced thereby is greater than the magnetic force of the permanent magnet 50, therefore switching the magnetic path into a path starting from the first type magnetic pole 51 - the north pole - to the iron core 30, the attraction surface 13, the first side 11, the housing 10, the second side 12, and then the second type magnetic pole 52 - the south pole, forming an inward magnetic circuit L to force the iron core 30 to displace leftwards and to have the left surface 31 thereof fixedly attracted to the attraction surface 13 for being kept in a position near the left.
- the iron core 30 With the path alteration and the elastic force from the spring 70, the iron core 30 is able to be stably kept in a position without consuming more electricity energy.
- the first type magnetic pole 51 of the permanent magnet 50 has a magnetic ring 53 for enhancement of the magnetic force; that is, the magnetic path from the first type magnetic pole 51 would pass the magnetic ring 53 and then go to the iron core 30 for an enhanced magnetic force for operation. If the magnetic force of the permanent magnet 50 is strong enough, the magnetic ring 53 can be optional. Most devices do not have a magnetic ring 53 in view of smaller volume and less cost requirement.
- FIGS. 3A-3F To further illustrate the magnetic path change in FIGS. 2A and 2B , further referring to FIGS. 3A-3F , when the power supply is off, the coil 20 is not energized, and the magnetic path is the first type magnetic pole 51 ⁇ the magnetic ring 53 ⁇ the iron core 30 ⁇ the second side 12 ⁇ the second type magnetic pole 52, thus forming an outward magnetic circuit R as the broken lines shown in FIG. 3A , a schematic diagram of FIG. 2A when the coil 20 is not energized. The iron core 30 therefore receives a rightward pushing force provided by the permanent magnet 50.
- FIG. 3B illustrates the magnetic path when the device receives a positive impulse voltage.
- the original path of the magnetic force of the permanent magnet 50 (shown in broken lines) would be offset by a magnetic force produced by the power energy (shown in unbroken lines), turning the magnetic path of the permanent magnet 50 into the direction of the path of the coil 20 and forcing the iron core 30 displacing leftwards as shown in FIG. 3C ; the magnetic path of the coil 20 is the shortest route.
- the magnetic path would become the one shown in FIG. 3C , entering into the second type magnetic pole 52 and exiting from the first type magnetic pole 51. Then the iron core 30 displaces leftwards to a position shown in FIG.
- the magnetic path being the first type magnetic pole 51 ⁇ the magnetic ring 53 ⁇ the iron core 30 ⁇ the attraction surface 13 ⁇ the first side 11 ⁇ the housing 10 ⁇ the second side 12 ⁇ the second type magnetic pole 52, thus forming an inward magnetic circuit L and keeping the iron core 30 in position without energizing the coil 20.
- FIG. 3E illustrates the magnetic path when the device receives a negative impulse voltage.
- the iron core 30 is originally kept leftwards, thus the magnetic path of the coil 20 has to be reverse of the one shown in FIG. 3D to displace the iron core 30 rightwards.
- the magnetic path is shown in unbroken lines in FIG. 3E , producing a force to displace the iron core 30 to the right.
- the magnetic force in the path shown in broken lines would offset the force produced by the permanent magnet 50 and the attraction surface 13 would repel, therefore displacing the iron core 30 rightwards to a position shown in FIG. 3F .
- the magnetic path is the shortest so continuous power supply for the coil 20 is not necessary.
- the path would be the first type magnetic pole 51 ⁇ the magnetic ring 53 ⁇ the iron core 30 ⁇ the second side 12 ⁇ the second type magnetic pole 52, thus forming a closed outward magnetic circuit R to provide a rightwards magnetic force for the iron core 30; Together with the elastic force from the spring 70, the iron core 30 displaces back to the position shown in FIG. 3A without energizing the coil 20.
- the spring 70 offers elastic force for the iron core 30 to displace rightwards, therefore it may increase little counter force when the iron core 30 displaces leftwards; but this would not affect the displacement operation at all. With the spring 70 and the double magnetic circuits, the iron core 30 is able to displace without consuming much power energy, thus achieving an energy-saving feature.
- a feature of the present invention is to displace the iron core 30 by a magnetic force produced from the coil 20.
- the magnetic path of the permanent magnet 50 is altered since the path of a magnetic force is the shortest route; without another magnetic force in counter direction, the iron core 30 would keep staying in the same position.
- the driving circuit 40 of the present invention can be disposed aside the housing 10 or isolated and connected to the coil 20 with an output wire 41 as shown in FIGS. 2A and 2B .
- the driving circuit 40 When the output wire 41 is electrified, the driving circuit 40 would output a positive impulse voltage; when the output wire 41 is not electrified, the driving circuit 40 would output a negative impulse voltage, so that the coil 20 is able to alter the magnetic path thereby, therefore displacing the iron core 30 and keeping it in a steady position.
- FIGS. 4A and 4B illustrate an application example of the present invention applied to a solenoid valve 90A.
- the second side 12 further connects to a valve 80 which has a chamber 82 arranged at the right side 32 of the iron core 30 and is separately connected to an inlet hole 81 and an outlet hole 83 so that the right surface 32 of the iron core 30 is able to abut on the inlet hole 81 for closure as shown in FIG. 4A .
- a pre-determined device 84 which is shown in FIG. 5C , so as to function as a solenoid valve 90A.
- FIGS. 5A-5C illustrated another application example of the present invention applied to a solenoid valve 90A.
- the iron core 30 further has a guiding hole 33 connecting the chamber 82, thereby the iron core 30 close the inlet hole 81 with its right surface 32 as shown in FIG. 5A, and FIG. 5B shows when the inlet hole 81 opens for air to enter the chamber 82 and then to be guided to the outlet hole 83;
- the pre-determined device 84 is an air discharging device to guide the air flowing back to into the chamber 82 via the outlet hole 83 to pass through the iron core 30 and to be discharged from the first side 11 via an axial through hole 11b of a column body 11a .
- the present invention is especially suitable for such structure of a solenoid valve for features of simple structure and no residual magnetism, but it is also applicable to other electric devices as well.
- the present invention has the outward magnetic circuit R and the inward magnetic circuit L with the design of single-sided attraction for fixing.
- the iron core 30 is able to be kept in a position with a wider stretching range for operation, increasing the possibilities of wider application and ensuring in-time adjusting in case of deviation and wear and tear of the device.
- the defect in US Patent No. 6,246,131 is therefore overcome.
- the present invention also requires less power for operation, thus achieving an energy-saving effect.
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Abstract
Description
- The present invention relates to a magnetic circuit switching device with single-sided attraction, particularly to one that has two magnetic circuits and a single-sided attraction structure for a displaceable iron core to have a wider stretching range in operation.
- The theory of magnetic field effect has been widely applied to valves, solenoids, and relays. A conventional solenoid valve attracts an iron core thereof by a magnetic force produced by an energized coil to open a valve port thereof. However, such solenoid valve has to keep energizing the coil to attract the iron core aside and keep a fixed position of the iron core, so as to keep the valve port opened. Therefore, it needs a great amount of power supply, and the solenoid valve would be overheated and burned by a short circuit after continuous operation.
- The present inventor has therefore disclosed a magnetic power apparatus in
US Patent No. 6,246,131 and a magnetic device with double fixing positions for changing the magnetic circuit inUS Patent No. 6,057,750 . The structure of amagnetic power apparatus 100 is illustrated inFIGS. 1A and 1B , including anouter shell 101, acoil 102, aniron core 103, apermanent magnet 104, aleft attraction surface 105, and aright attraction surface 106. When thecoil 102 is energized, theiron core 103 displaces leftwards or rightwards due to the magnetic force from thecoil 102 or the permanent magnetic 104. Such structure has both sides to fixedly keep the position of theiron core 103 in operation by thepermanent magnet 104, so it does not need continuous electricity supply, thus being energy-saving and preventing the invention from overheating and burning by a short circuit. The safety and durability are therefore ensured in the improved structure. However, the stretching range D of theiron core 103 is restricted due to the double sided fixing position; that is, theright attraction surface 106 is a closedstructure 107. If the stretching range D is design to be 5mm, theiron core 103 can only displaces exactly 5mm, shorter or further is impossible. In this case, when an applied device (not shown) has deviation or wear and tear, the operation would be affected. Either the design is thepermanent magnet 104 in a column shape with theiron core 103 disposed around thepermanent magnet 104 as shown inFIGS. 1A and 1B , or the design is thepermanent magnet 104 in a ring shape with theiron core 103 disposed in-between a plurality ofpermanent magnets 104 as shown inFIG. 5 and 6 in theUS Patent No. 6,246,131 , the defect would affect the operation. - Consequently, the inventor has devoted to improving the restriction defect of the stretching range of the
iron core 103. - A primary object of the present invention is to provide a magnetic circuit switching device with single-sided attraction that has a magnetic path alteration function and an elastic force from a spring to keep an iron core in a pre-determined position, also enabling the iron core to have a wider stretching range for operation, increasing the possibilities of wider application and ensuring in-time adjusting in case of deviation and wear and tear of the device.
- Another object of the present invention is to provide a magnetic circuit switching device with single-sided attraction that is able to change a normal position of the iron core with less power supply for operation, thus achieving an energy-saving effect.
- In order to achieve the object above, the present invention comprises a housing, a driving circuit, a permanent magnet, a nonconductive axial tube, and a spring according to the annexed claim 1; whereby a magnetic path of the coil starts from the first type magnetic pole to the iron core, the second side, and then the second type magnetic pole when the coil is not energized, forming an outward magnetic circuit to provide a magnetic force for the iron core to displace rightwards with the spring providing an elastic force for the displacement as well, so that the iron core is kept in a position near the right; and when the driving circuit outputting an impulse voltage, the coil is energized, and a magnetic force produced thereby is greater than the magnetic force of the permanent magnet, therefore switching the magnetic path into a path starting from the first type magnetic pole to the iron core, the attraction surface, the first side, the housing, the second side, and then the second type magnetic pole, forming an inward magnetic circuit to force the iron core to displace leftwards and to have the left surface thereof fixedly attracted to the attraction surface for being kept in a position near the left; with the path alteration and the elastic force from the spring, the iron core is able to be stably kept in a position without consuming more electricity energy.
- In addition, according to a particular embodiment, the iron core includes a conductive left section and a nonconductive right section to be engaged to form the iron core, and the driving circuit includes an output wire connected to the coil, which outputs a positive impulse voltage when electrified, and outputs a negative impulse voltage when not electrified, so that the coil is able to alter the magnetic path thereby, therefore displacing the iron core and keeping it in a steady position. Preferably, the first type magnetic pole of the permanent magnet is the north pole and the second magnetic pole is the south pole; advantageously, the first type magnetic pole of the permanent magnet further has a magnetic ring.
- In an applicable embodiment, the attraction surface is arranged at an end of a column body perpendicularly disposed on an inner side of the first side. The column body has an axial through hole arranged therein. And, preferably, the second side further connects to a valve which has a chamber arranged at the right side of the iron core and is separately connected to an inlet hole and an outlet hole so that the right surface of the iron core is able to abut on the inlet hole for closure; and the iron core further has a guiding hole connecting the chamber, so as to guide the air flowing back to the chamber to pass through the iron core and the axial through hole of the column body, to be discharged from the first side.
- With features disclosed above, the present invention has double magnetic circuits with single-sided attraction structure to replace the closed structure design disclosed in
US Patent No. 6,246,131 , so as to keep an iron core in a pre-determined position. With a magnetic path alteration function and an elastic force from a spring, the iron core has a wider stretching range for operation, increasing the possibilities of wider application and ensuring in-time adjusting in case of deviation and wear and tear of the device. Also, the present invention requires less power for operation, thus achieving an energy-saving effect. -
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FIG. 1A is a schematic diagram of a conventional double fixed solenoid valve structure, illustrating an iron core thereof displacing rightwards; -
FIG. 1B is a schematic diagram of a conventional double fixed solenoid valve structure, illustrating an iron core thereof displacing leftwards; -
FIG. 2A is a sectional view of the invention in an applicable embodiment, illustrating an iron core thereof displacing rightwards; -
FIG. 2B is a sectional view of the invention in an applicable embodiment, illustrating an iron core thereof displacing leftwards; -
FIG. 3A is a schematic diagram ofFIG. 2A , showing a magnetic path when the present invention is not activated; -
FIG. 3B is a schematic diagram showing a magnetic path when the present invention is activated by a positive impulse voltage; -
FIG. 3C is a schematic diagram showing a magnetic path when the iron core is displacing leftwards; -
FIG. 3D is a schematic diagram showing a magnetic path after the iron core displaces leftwards; -
FIG. 3E is a schematic diagram showing a magnetic path when the present invention is activated by a negative impulse voltage; -
FIG. 3F is a schematic diagram showing a magnetic path after the iron core displaces rightwards; -
FIG. 4A is an application example of the present invention applied to a solenoid valve, showing rightward displacement of the iron core; -
FIG. 4B is an application example of the present invention applied to a solenoid valve, showing leftward displacement of the iron core; -
FIG. 5A is another application example of the present invention applied to a solenoid valve, showing rightward displacement of the iron core stopping the air intake; -
FIG. 5B is another application example of the present invention applied to a solenoid valve, showing leftward displacement of the iron core enabling the air intake and outlet; and -
FIG. 5C is another application example of the present invention applied to a solenoid valve, showing rightward displacement of the iron core stopping the air intake and enabling the air outlet. - Referring to
FIGS. 2A and 2B , the present invention includes ahousing 10, a drivingcircuit 40, apermanent magnet 50, a nonconductiveaxial tube 60, and aspring 70. - The
housing 10 has acoil 20 arranged therein for aniron core 30 to linearly displace within. Theiron core 20 is at least partially engaged in thecoil 20 in normal status. The drivingcircuit 40 is arranged aside thehousing 10 to provide an impulse voltage for path altering of a magnetic force, changing a position of theiron core 30, and therefore forming a solenoidmagnetic device 90; such structure has been disclosed in the prior art. - The feature of the present invention lies in that the
housing 10 further has afirst side 11 and asecond side 12 individually arranged at either side thereof, both of which are conductive, and thefirst side 11 has anattraction surface 13 to attract aleft surface 31 of theiron core 30. - The
permanent magnet 50 has a first typemagnetic pole 51 and a second typemagnetic pole 52 individually arranged at inner and outer side thereof with opposite properties. The second typemagnetic pole 52 contacts thesecond side 12 of thehousing 10 for operation. In this embodiment, the first typemagnetic pole 51 of thepermanent magnet 50 is the north pole and the secondmagnetic pole 52 is the south pole; and aright section 30R of theiron core 30 is able to pass through an inner periphery of thepermanent magnet 50 for operation. Theiron core 30 is preferred to include a conductiveleft section 30L and anonconductive right section 30R to be engaged to form theiron core 30, but the present invention is not limited to such application. Theiron core 30 is also applicable to be formed in one-piece by conductive materials, but theright section 30R should be arranged with a diameter shorter than the one of theleft section 30L to avoid affecting the magnetic path, so that the magnetic path would follow the direction in the unbroken lines shown inFIG. 3C , entering the south pole and exiting from the north pole, then going along theleft section 30L of theiron core 30. In short, the magnetic path would not be affected or changed whether theright section 30R of theiron core 30 is made of conductive materials or not. - Furthermore, the
iron core 30 has aright surface 32 arranged at the corresponding side to theleft surface 31. Referring toFIGS. 5A to 5C , in a preferred embodiment, theleft surface 31 and theright surface 32 each has a flat surface arranged thereon for abutment on theattraction surface 13 or a pre-determined position, and the flat surfaces may further have adhesives thereon to ensure a tight and fixed abutment. - The nonconductive
axial tube 60 is arranged for theleft section 30L of theiron core 30 to engage; it has anopening 61 at right side thereof extending to thesecond side 12 of thehousing 10 for theright surface 32 of theiron core 30 to be pushed out from thehousing 30. Thespring 70 is arranged around theiron core 30 at a pre-determined position to provide elastic force for theiron core 30. In this embodiment, thespring 70 is mounted around theright section 30R of theiron core 30 with its inner end abutting on theopening 61 of theaxial tube 60 and its outer end abutting on a protrudingflange 33 at the right end of theiron core 30, so as to provide elastic force for theiron core 30 to displace rightwards. Or thespring 70 can be arranged between theleft surface 31 of theiron core 30 and theattraction surface 13 to provide elastic force with the same effect. - As illustrated in
FIG. 2A , whereby a magnetic path of thecoil 20 is formed starting from the first type magnetic pole 51 - the north pole - to theiron core 30, thesecond side 12, and then the second type magnetic pole 52 - the south pole - when thecoil 20 is not energized, thus forming an outward magnetic circuit R to provide a magnetic force for theiron core 30 to displace rightwards with thespring 70 providing an elastic force for the displacement as well, so that theiron core 30 is kept in a position near right. A feature of the present invention is that theright surface 32 of theiron core 30 is not restricted by a closed side; it can pass through thesecond side 12. Unlike a conventional device, theiron core 30 of the present invention therefore has a wider stretching range for operation. In addition, thesecond side 12 further connects to avalve 80 which has aninlet hole 81; theiron core 30 is able to complement any deviation and wear and tear of the device, ensuring in-time adjusting when theright surface 32 is abutting on theinlet hole 81 during operation. - Further referring to
FIG. 2B , when the drivingcircuit 40 outputs an impulse voltage, thecoil 20 is energized and a magnetic force produced thereby is greater than the magnetic force of thepermanent magnet 50, therefore switching the magnetic path into a path starting from the first type magnetic pole 51 - the north pole - to theiron core 30, theattraction surface 13, thefirst side 11, thehousing 10, thesecond side 12, and then the second type magnetic pole 52 - the south pole, forming an inward magnetic circuit L to force theiron core 30 to displace leftwards and to have theleft surface 31 thereof fixedly attracted to theattraction surface 13 for being kept in a position near the left. With the path alteration and the elastic force from thespring 70, theiron core 30 is able to be stably kept in a position without consuming more electricity energy. - In this embodiment, the first type
magnetic pole 51 of thepermanent magnet 50 has amagnetic ring 53 for enhancement of the magnetic force; that is, the magnetic path from the first typemagnetic pole 51 would pass themagnetic ring 53 and then go to theiron core 30 for an enhanced magnetic force for operation. If the magnetic force of thepermanent magnet 50 is strong enough, themagnetic ring 53 can be optional. Most devices do not have amagnetic ring 53 in view of smaller volume and less cost requirement. - To further illustrate the magnetic path change in
FIGS. 2A and 2B , further referring toFIGS. 3A-3F , when the power supply is off, thecoil 20 is not energized, and the magnetic path is the first typemagnetic pole 51 → themagnetic ring 53 → theiron core 30 → thesecond side 12 → the second typemagnetic pole 52, thus forming an outward magnetic circuit R as the broken lines shown inFIG. 3A , a schematic diagram ofFIG. 2A when thecoil 20 is not energized. Theiron core 30 therefore receives a rightward pushing force provided by thepermanent magnet 50. -
FIG. 3B illustrates the magnetic path when the device receives a positive impulse voltage. When receiving a positive impulse voltage, the original path of the magnetic force of the permanent magnet 50 (shown in broken lines) would be offset by a magnetic force produced by the power energy (shown in unbroken lines), turning the magnetic path of thepermanent magnet 50 into the direction of the path of thecoil 20 and forcing theiron core 30 displacing leftwards as shown inFIG. 3C ; the magnetic path of thecoil 20 is the shortest route. After theiron core 30 displaces leftwards, the magnetic path would become the one shown inFIG. 3C , entering into the second typemagnetic pole 52 and exiting from the first typemagnetic pole 51. Then theiron core 30 displaces leftwards to a position shown inFIG. 3D , with the magnetic path being the first typemagnetic pole 51 → themagnetic ring 53 → theiron core 30 →theattraction surface 13 → thefirst side 11 → thehousing 10 → thesecond side 12 → the second typemagnetic pole 52, thus forming an inward magnetic circuit L and keeping theiron core 30 in position without energizing thecoil 20. -
FIG. 3E illustrates the magnetic path when the device receives a negative impulse voltage. Theiron core 30 is originally kept leftwards, thus the magnetic path of thecoil 20 has to be reverse of the one shown inFIG. 3D to displace theiron core 30 rightwards. When receiving a negative impulse voltage, the magnetic path is shown in unbroken lines inFIG. 3E , producing a force to displace theiron core 30 to the right. The magnetic force in the path shown in broken lines would offset the force produced by thepermanent magnet 50 and theattraction surface 13 would repel, therefore displacing theiron core 30 rightwards to a position shown inFIG. 3F . The magnetic path is the shortest so continuous power supply for thecoil 20 is not necessary. The path would be the first typemagnetic pole 51 → themagnetic ring 53 → theiron core 30 → thesecond side 12 → the second typemagnetic pole 52, thus forming a closed outward magnetic circuit R to provide a rightwards magnetic force for theiron core 30; Together with the elastic force from thespring 70, theiron core 30 displaces back to the position shown inFIG. 3A without energizing thecoil 20. Thespring 70 offers elastic force for theiron core 30 to displace rightwards, therefore it may increase little counter force when theiron core 30 displaces leftwards; but this would not affect the displacement operation at all. With thespring 70 and the double magnetic circuits, theiron core 30 is able to displace without consuming much power energy, thus achieving an energy-saving feature. - In short, a feature of the present invention is to displace the
iron core 30 by a magnetic force produced from thecoil 20. The magnetic path of thepermanent magnet 50 is altered since the path of a magnetic force is the shortest route; without another magnetic force in counter direction, theiron core 30 would keep staying in the same position. - The driving
circuit 40 of the present invention can be disposed aside thehousing 10 or isolated and connected to thecoil 20 with anoutput wire 41 as shown inFIGS. 2A and 2B . When theoutput wire 41 is electrified, the drivingcircuit 40 would output a positive impulse voltage; when theoutput wire 41 is not electrified, the drivingcircuit 40 would output a negative impulse voltage, so that thecoil 20 is able to alter the magnetic path thereby, therefore displacing theiron core 30 and keeping it in a steady position. -
FIGS. 4A and 4B illustrate an application example of the present invention applied to asolenoid valve 90A. Thesecond side 12 further connects to avalve 80 which has achamber 82 arranged at theright side 32 of theiron core 30 and is separately connected to aninlet hole 81 and anoutlet hole 83 so that theright surface 32 of theiron core 30 is able to abut on theinlet hole 81 for closure as shown inFIG. 4A . Referring toFIG. 4B , when theiron core 30 displaces leftwards, theinlet hole 81 opens for air to enter thechamber 82 and to be guided into theoutlet hole 83, then apre-determined device 84 which is shown inFIG. 5C , so as to function as asolenoid valve 90A. - Furthermore,
FIGS. 5A-5C illustrated another application example of the present invention applied to asolenoid valve 90A. Theiron core 30 further has a guidinghole 33 connecting thechamber 82, thereby theiron core 30 close theinlet hole 81 with itsright surface 32 as shown inFIG. 5A, and FIG. 5B shows when theinlet hole 81 opens for air to enter thechamber 82 and then to be guided to theoutlet hole 83; inFIG. 5C , thepre-determined device 84 is an air discharging device to guide the air flowing back to into thechamber 82 via theoutlet hole 83 to pass through theiron core 30 and to be discharged from thefirst side 11 via an axial throughhole 11b of acolumn body 11a. The present invention is especially suitable for such structure of a solenoid valve for features of simple structure and no residual magnetism, but it is also applicable to other electric devices as well. - With aforesaid structures and measures, the present invention has the outward magnetic circuit R and the inward magnetic circuit L with the design of single-sided attraction for fixing. By changing path of the magnetic force and the elastic force from the
spring 70, theiron core 30 is able to be kept in a position with a wider stretching range for operation, increasing the possibilities of wider application and ensuring in-time adjusting in case of deviation and wear and tear of the device. The defect inUS Patent No. 6,246,131 is therefore overcome. On the other hand, the present invention also requires less power for operation, thus achieving an energy-saving effect. - Although particular embodiments of the invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.
Claims (8)
- A magnetic circuit switching device with single-sided attraction, comprising:a housing (10) including a coil (20) arranged therein for an iron core (30) to linearly displace within; said iron core (30) being at least partially engaged in the coil (20) in normal status;a driving circuit (40) arranged aside the housing (10) to provide an impulse voltage for path altering of a magnetic force, changing a position of the iron core (30), and therefore forming a solenoid magnetic device;characterized in that the housing (10) further has a first side (11) and a second side (12) individually arranged at either side thereof, both of which are conductive, and the first side (11) has an attraction surface (13) to attract a left surface (31) of the iron core (30);a permanent magnet (50) having a first type magnetic pole (51) and a second type magnetic pole (52) individually arranged at inner and outer side thereof with opposite properties, the second type magnetic pole (52) contacting the second side (12) of the housing (10) and a right section (30R) of the iron core (30) being able to pass through an inner periphery of the permanent magnet (50) for operation;a nonconductive axial tube (60) for a left section (30L) of the iron core (30) to engage, having an opening (61) at right side thereof extending to the second side (12) of the housing (10) for a right surface (32) of the iron core (30) to be pushed out from the housing (10); anda spring (70) arranged around the iron core (30) at a pre-determined position to provide elastic force for the iron core (30);whereby a magnetic path of the coil (20) starts from the first type magnetic pole (51) to the iron core (30), the second side (12), and then the second type magnetic pole (52) when the coil (20) is not energized, forming an outward magnetic circuit (R) to provide a magnetic force for the iron core (30) to displace rightwards with the spring (70) providing an elastic force for the displacement as well, so that the iron core (30) is kept in a position near the right; and when the driving circuit (40) outputting an impulse voltage, the coil (20) is energized, and a magnetic force produced thereby is greater than the magnetic force of the permanent magnet (50), therefore switching the magnetic path into a path starting from the first type magnetic pole (51) to the iron core (30), the attraction surface (13), the first side (11), the housing (10), the second side (12), and then the second type magnetic pole (52), forming an inward magnetic circuit (L) to force the iron core (30) to displace leftwards and to have the left surface (31) thereof fixedly attracted to the attraction surface (13) for being kept in a position near the left; with the path alteration and the elastic force from the spring (70), the iron core (30) is able to be stably kept in a position without consuming more electricity energy.
- The magnetic circuit switching device with single-sided attraction as claimed in claim 1, wherein the iron core (30) includes a conductive left section (30L) and a nonconductive right section (30R) to be engaged to form the iron core (30).
- The magnetic circuit switching device with single-sided attraction as claimed in claim 1, wherein the driving circuit (40) includes an output wire (41) connected to the coil (20), which outputs a positive impulse voltage when electrified, and outputs a negative impulse voltage when not electrified, so that the coil (20) is able to alter the magnetic path thereby, therefore displacing the iron core (30) and keeping it in a steady position.
- The magnetic circuit switching device with single-sided attraction as claimed in claim 1, wherein the first type magnetic pole (51) of the permanent magnet (50) is the north pole and the second magnetic pole (52) is the south pole.
- The magnetic circuit switching device with single-sided attraction as claimed in claim 4, wherein the first type magnetic pole (51) of the permanent magnet (50) has a magnetic ring (53).
- The magnetic circuit switching device with single-sided attraction as claimed in claim 1, wherein the attraction surface (13) is arranged at an end of a column body (11a) perpendicularly disposed on an inner side of the first side (11).
- The magnetic circuit switching device with single-sided attraction as claimed in claim 6, wherein the column body (11a) has an axial through hole (11b) arranged therein.
- The magnetic circuit switching device with single-sided attraction as claimed in claim 7, wherein the second side (12) further connects to a valve (80) which has a chamber (82) arranged at the right side of the iron core (30) and is separately connected to an inlet hole (81) and an outlet hole (83) so that the right surface (32) of the iron core (30) is able to abut on the inlet hole (81) for closure; and the iron core (30) further has a guiding hole (34) connecting the chamber (82), so as to guide the air flowing back to the chamber (82) to pass through the iron core (30) and the axial through hole (11b) of the column body (11a), to be discharged from the first side (11).
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EP15198358.2A EP3179488B1 (en) | 2015-12-08 | 2015-12-08 | A magnetic circuit switching device with single-sided attraction |
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EP15198358.2A EP3179488B1 (en) | 2015-12-08 | 2015-12-08 | A magnetic circuit switching device with single-sided attraction |
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EP3179488B1 EP3179488B1 (en) | 2018-10-24 |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN109473310A (en) * | 2018-12-29 | 2019-03-15 | 昆山瑞普电气有限公司 | The permanent-magnet manipulating mechanism used in oil |
CN110111971A (en) * | 2019-06-14 | 2019-08-09 | 哈尔滨工业大学 | The stable two-way Self-retaining electromagnet in position is realized based on spring pressure and magnetic attraction |
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GB2099223A (en) * | 1981-04-22 | 1982-12-01 | Hosiden Electronics Co | Self-sustaining solenoid |
US5029807A (en) * | 1988-04-30 | 1991-07-09 | Messerschmitt-Boelkow-Blohm Gmbh | Solenoid valve |
US6057750A (en) | 1999-05-04 | 2000-05-02 | Sheng; Chih-Sheng | Magnet device with double fixing positions for changing the magnetic circuit |
US6246131B1 (en) | 1999-12-07 | 2001-06-12 | Chih-Sheng Sheng | Magnetic power apparatus |
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2015
- 2015-12-08 EP EP15198358.2A patent/EP3179488B1/en active Active
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Publication number | Priority date | Publication date | Assignee | Title |
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GB2099223A (en) * | 1981-04-22 | 1982-12-01 | Hosiden Electronics Co | Self-sustaining solenoid |
US5029807A (en) * | 1988-04-30 | 1991-07-09 | Messerschmitt-Boelkow-Blohm Gmbh | Solenoid valve |
US6057750A (en) | 1999-05-04 | 2000-05-02 | Sheng; Chih-Sheng | Magnet device with double fixing positions for changing the magnetic circuit |
US6246131B1 (en) | 1999-12-07 | 2001-06-12 | Chih-Sheng Sheng | Magnetic power apparatus |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN109473310A (en) * | 2018-12-29 | 2019-03-15 | 昆山瑞普电气有限公司 | The permanent-magnet manipulating mechanism used in oil |
CN109473310B (en) * | 2018-12-29 | 2024-05-31 | 昆山瑞普电气有限公司 | Permanent magnet operating mechanism used in oil |
CN110111971A (en) * | 2019-06-14 | 2019-08-09 | 哈尔滨工业大学 | The stable two-way Self-retaining electromagnet in position is realized based on spring pressure and magnetic attraction |
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