EP1722380B1 - Direct current electric actuator, for domestic appliances in particular - Google Patents

Direct current electric actuator, for domestic appliances in particular Download PDF

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Publication number
EP1722380B1
EP1722380B1 EP06113745A EP06113745A EP1722380B1 EP 1722380 B1 EP1722380 B1 EP 1722380B1 EP 06113745 A EP06113745 A EP 06113745A EP 06113745 A EP06113745 A EP 06113745A EP 1722380 B1 EP1722380 B1 EP 1722380B1
Authority
EP
European Patent Office
Prior art keywords
shell
nucleus
electrically controlled
formation
actuator according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP06113745A
Other languages
German (de)
French (fr)
Other versions
EP1722380A3 (en
EP1722380A2 (en
Inventor
Giuseppe Marone
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Elbi International SpA
Original Assignee
Elbi International SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Elbi International SpA filed Critical Elbi International SpA
Priority to PL06113745T priority Critical patent/PL1722380T3/en
Publication of EP1722380A2 publication Critical patent/EP1722380A2/en
Publication of EP1722380A3 publication Critical patent/EP1722380A3/en
Application granted granted Critical
Publication of EP1722380B1 publication Critical patent/EP1722380B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • H01F7/081—Magnetic constructions
    • 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
    • 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
    • H01F7/081—Magnetic constructions
    • H01F2007/083—External yoke surrounding the coil bobbin, e.g. made of bent magnetic sheet

Definitions

  • the present invention refers to an electrically controlled actuator.
  • the invention refers to an electrically controlled direct current actuator of the kind defined in the preamble of claim 1.
  • US 2003/155839 A1 discloses an actuator of that kind with a cylindrical tubular nucleus having a flat annular terminal surface for abutment against a corresponding flat annular surface of a ferromagnetic frame or shell.
  • EP-A-0 185 262 discloses an actuator wherein a blind conical internal protrusion of a ferromagnetic frame or shell is adapted to engage a corresponding frusto-conical end recess of the nucleus.
  • One purpose of the present invention is to realize an electrically controlled actuator as specified above, of a perfected type and which is reliable and can be produced in a simple and economical manner.
  • an electrically controlled direct current actuator according to the invention is indicated as a whole as 10.
  • the actuator 10 is suitable for insertion in devices for distributing a washing and/or rinsing agent for domestic appliances such as washing machines, dishwashers and the like (not illustrated), but can also be used in other applications, without leaving the framework of the invention by so doing.
  • the actuator 10 comprises a shell 12 made in a single piece with a sheet of ferromagnetic material, substantially shaped in C form, and including a first and second lateral branch 14, 16 reciprocally opposed and interconnected by an intermediate portion 18.
  • the monolithic conformation of the shell 12 makes it possible to simplify the assembly of the actuator 10 as, according to a pre-existing technology, this shell was generally made in two components intended to be welded together.
  • the shell 12 houses, in a fixed manner in its internal region, a reel 20 around which a coil 22 of electrically insulated conductor wire is wound, and with, at its ends, a pair of connection elements 24, such as lamellar pins.
  • a reel 20 and the coil 22 are enclosed by an insulating casing 26 with a substantially cylindrical form, from which the connection elements 24 protrude towards the outside.
  • the coil 22 has an axis A-A which extends in a direction substantially at right angles to the first and second branch 14, 16 of the shell 12.
  • the actuator 10 also comprises a ferromagnetic nucleus 28 mounted movably with respect to the shell 12, in a manner axially translatable inside the coil 22.
  • the nucleus 28 is suitable for passing, in a manner in itself known, from an axial rest position (not shown) to an axial working position (shown in the figures) as an effect of excitation of the coil 22.
  • the nucleus 28 can be connected to elastic elements (not illustrated) of types per se known, for example a traction or compression spring, intended to hold it in/return it to the rest position when the coil 22 is deenergized.
  • the first lateral branch 14 of the shell 12 has a formation 30 with a substantially truncated cone form and the nucleus 28 has a corresponding end 32, shaped in a manner substantially complementary to the formation 30.
  • the end 32 is intended in a manner in itself known to cooperate, in a manner in itself known, with kinematic or lever mechanisms (not illustrated) by means of the translation of the nucleus 28.
  • the complementary truncated cone configuration between the end 32 of the nucleus 28 and the formation 30 of the shell 12 advantageously makes it possible to create an air gap (between the nucleus 28 and the formation 30) with a width which is lower than the stroke of the nucleus 28 relative to said formation. This makes it possible to obtain a dampening of the translation movement of the nucleus 28, due to the progressive variation of the air gap between the nucleus 28 and the formation 30. Furthermore, the above configuration permits improved centring of the nucleus 28 with respect to the shell 12 and to the casing 26, in such a way as to prevent its displacement from the A-A axis of the coil 22.
  • the formation 30 is turned towards the region outside the shell 12, and the shaped end 32 of the nucleus 28 comprises a truncated cone protrusion.
  • This configuration is found to be advantageous as it facilitates the assembly of the components of the actuator 10 as a whole. In this way, it is not necessary to open out the lateral branches 14, 16 to permit the insertion of the reel-coil-casing 20-22-26 assembly into the region inside the shell 12.
  • the nucleus 28 is hollow and manufactured by means of drawing, and the formation 30 is manufactured by means of a drawing or coining operation, and a shearing operation.
  • the second lateral branch 16, opposite the first lateral branch 14 comprising the formation 30, advantageously has an opening 34 through which the nucleus 28 faces towards the outside of the shell 12.
  • the second lateral branch 16 conveniently comprises a collar 36 integral with it and protruding towards the region outside the shell 12.
  • the collar 36 can be protruding towards the region inside the shell 12. The presence of the collar 36 favours the efficiency of the magnetic flux induced by excitation of the coil 22.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnets (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
  • Food-Manufacturing Devices (AREA)
  • Cookers (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

The electrically controlled actuator (10), in domestic appliances in particular, comprises - a shell (12) realized in a single piece in ferromagnetic material, substantially shaped in C form and including a first and second lateral branch (14, 16) reciprocally opposed and interconnected by an intermediate portion (18); - a coil (22) of conductor wire fixed to the shell (12) in such a way that its axis (A-A) extends in a direction substantially at right angles to the lateral branches (14, 16) of the shell (12); and - a ferromagnetic nucleus (28) mounted movably with respect to the shell (12) in a manner axially translatable inside the coil (22) and suitable for passing from an axial rest position to an axial working position as an effect of excitation of the coil (22).

Description

  • The present invention refers to an electrically controlled actuator.
  • More specifically, the invention refers to an electrically controlled direct current actuator of the kind defined in the preamble of claim 1.
  • US 2003/155839 A1 discloses an actuator of that kind with a cylindrical tubular nucleus having a flat annular terminal surface for abutment against a corresponding flat annular surface of a ferromagnetic frame or shell.
  • EP-A-0 185 262 discloses an actuator wherein a blind conical internal protrusion of a ferromagnetic frame or shell is adapted to engage a corresponding frusto-conical end recess of the nucleus.
  • One purpose of the present invention is to realize an electrically controlled actuator as specified above, of a perfected type and which is reliable and can be produced in a simple and economical manner.
  • This and other purposes are realized according to the invention by means of an electrically controlled direct current actuator having the features defined in claim 1.
  • Further characteristics and advantages of the invention will appear clear from the detailed description which follows, given for purely exemplificative and not limiting purposes, with reference to the attached drawings, in which:
    • figure 1 is a perspective view of a preferred form of embodiment of the actuator according to the invention; and
    • figure 2 is a longitudinal section view of the actuator along the line II-II of figure 1.
  • With reference to figures 1 and 2, an electrically controlled direct current actuator according to the invention is indicated as a whole as 10.
  • The actuator 10 is suitable for insertion in devices for distributing a washing and/or rinsing agent for domestic appliances such as washing machines, dishwashers and the like (not illustrated), but can also be used in other applications, without leaving the framework of the invention by so doing.
  • The actuator 10 comprises a shell 12 made in a single piece with a sheet of ferromagnetic material, substantially shaped in C form, and including a first and second lateral branch 14, 16 reciprocally opposed and interconnected by an intermediate portion 18. The monolithic conformation of the shell 12 makes it possible to simplify the assembly of the actuator 10 as, according to a pre-existing technology, this shell was generally made in two components intended to be welded together.
  • As can be seen in figure 2, the shell 12 houses, in a fixed manner in its internal region, a reel 20 around which a coil 22 of electrically insulated conductor wire is wound, and with, at its ends, a pair of connection elements 24, such as lamellar pins. Preferably the reel 20 and the coil 22 are enclosed by an insulating casing 26 with a substantially cylindrical form, from which the connection elements 24 protrude towards the outside.
  • The coil 22 has an axis A-A which extends in a direction substantially at right angles to the first and second branch 14, 16 of the shell 12.
  • The actuator 10 also comprises a ferromagnetic nucleus 28 mounted movably with respect to the shell 12, in a manner axially translatable inside the coil 22. The nucleus 28 is suitable for passing, in a manner in itself known, from an axial rest position (not shown) to an axial working position (shown in the figures) as an effect of excitation of the coil 22. Optionally, the nucleus 28 can be connected to elastic elements (not illustrated) of types per se known, for example a traction or compression spring, intended to hold it in/return it to the rest position when the coil 22 is deenergized.
  • As can be seen in figure 2, the first lateral branch 14 of the shell 12 has a formation 30 with a substantially truncated cone form and the nucleus 28 has a corresponding end 32, shaped in a manner substantially complementary to the formation 30.
  • In this form of embodiment, the end 32 is intended in a manner in itself known to cooperate, in a manner in itself known, with kinematic or lever mechanisms (not illustrated) by means of the translation of the nucleus 28.
  • The complementary truncated cone configuration between the end 32 of the nucleus 28 and the formation 30 of the shell 12 advantageously makes it possible to create an air gap (between the nucleus 28 and the formation 30) with a width which is lower than the stroke of the nucleus 28 relative to said formation. This makes it possible to obtain a dampening of the translation movement of the nucleus 28, due to the progressive variation of the air gap between the nucleus 28 and the formation 30. Furthermore, the above configuration permits improved centring of the nucleus 28 with respect to the shell 12 and to the casing 26, in such a way as to prevent its displacement from the A-A axis of the coil 22.
  • Conveniently, the formation 30 is turned towards the region outside the shell 12, and the shaped end 32 of the nucleus 28 comprises a truncated cone protrusion. This configuration is found to be advantageous as it facilitates the assembly of the components of the actuator 10 as a whole. In this way, it is not necessary to open out the lateral branches 14, 16 to permit the insertion of the reel-coil-casing 20-22-26 assembly into the region inside the shell 12.
  • Preferably, the nucleus 28 is hollow and manufactured by means of drawing, and the formation 30 is manufactured by means of a drawing or coining operation, and a shearing operation.
  • The second lateral branch 16, opposite the first lateral branch 14 comprising the formation 30, advantageously has an opening 34 through which the nucleus 28 faces towards the outside of the shell 12. Around the opening 34, the second lateral branch 16 conveniently comprises a collar 36 integral with it and protruding towards the region outside the shell 12. Indifferently the collar 36 can be protruding towards the region inside the shell 12. The presence of the collar 36 favours the efficiency of the magnetic flux induced by excitation of the coil 22.

Claims (8)

  1. Electrically controlled direct current actuator (10), in particular for distributor devices suitable for use in domestic appliances such as washing machines, dishwashers and the like, comprising
    - a shell (12) realized in a single piece in ferromagnetic material, substantially shaped in C form and including a first and a second lateral branch (14, 16) reciprocally opposed and interconnected by an intermediate portion (18); the first or second lateral branch (14; 16) of the shell (12) having a formation (30) with a substantially truncated-cone external form turned towards the region outside the shell (12);
    - a coil (22) of conductor wire fixed to the shell (12) in such a way that its axis (A-A) extends in a direction substantially at right angles to the abovementioned lateral branches (14, 16) of the shell (12); and
    - a ferromagnetic nucleus (28) mounted movably with respect to the shell (12) in a manner axially translatable inside the coil (22) and suitable for passing from an axial rest position to an axial working position as an effect of excitation of the coil (22);
    the actuator (10) being characterised in that said formation (30) of the shell (12) has a substantially truncated-cone internal form, and
    the nucleus (28) has a corresponding end (32) comprising a truncated-cone protrusion shaped in a manner substantially complementary to the internal form of said formation (30); said formation (30) of the shell (12) having an opening through which said protrusion (32) of the nucleus (28) is accessible from outside said shell (12).
  2. Electrically controlled actuator according to claim 1, in which the nucleus (28) is substantially hollow.
  3. Electrically controlled actuator according to Claim 2, in which the nucleus (28) is manufactured by drawing.
  4. Electrically controlled actuator according to any one of Claims 1 to 3, in which the formation (30) is made by drawing or coining, and shearing.
  5. Electrically controlled actuator according to Claim 1, in which the second or first lateral branch (16; 14) has an opening (34) through which the nucleus (28) faces towards the outside of the shell (12); said second or first lateral branch (16; 14) comprises a collar (36) integral with it, located around the opening (34).
  6. Electrically controlled actuator according to Claim 5, in which the collar (36) protrudes towards the region outside the shell (12).
  7. Electrically controlled actuator according to Claim 5, in which the collar (36) protrudes towards the region inside the shell (12).
  8. Actuator according to Claim 5, in which the second or first branch (16; 14) provided with the collar (36) is opposite the first or second lateral branch (14; 16) provided with the formation (30).
EP06113745A 2005-05-11 2006-05-10 Direct current electric actuator, for domestic appliances in particular Active EP1722380B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL06113745T PL1722380T3 (en) 2005-05-11 2006-05-10 Direct current electric actuator, for domestic appliances in particular

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000059U ITTO20050059U1 (en) 2005-05-11 2005-05-11 ELECTRIC CURRENT ACTUATOR, IN PARTICULAR FOR HOUSEHOLD APPLIANCES.

Publications (3)

Publication Number Publication Date
EP1722380A2 EP1722380A2 (en) 2006-11-15
EP1722380A3 EP1722380A3 (en) 2009-03-18
EP1722380B1 true EP1722380B1 (en) 2012-05-02

Family

ID=36764552

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06113745A Active EP1722380B1 (en) 2005-05-11 2006-05-10 Direct current electric actuator, for domestic appliances in particular

Country Status (5)

Country Link
EP (1) EP1722380B1 (en)
AT (1) ATE556417T1 (en)
ES (1) ES2387034T3 (en)
IT (1) ITTO20050059U1 (en)
PL (1) PL1722380T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10475563B2 (en) 2015-05-29 2019-11-12 Bitron S.P.A. Direct current electric actuator, in particular for electrical household appliances

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3593240A (en) * 1969-03-10 1971-07-13 Whirlpool Co Solenoid structure having single sheet metal plunger and/or yoke
US3987385A (en) * 1975-05-23 1976-10-19 Technar Incorporated Constant force solenoid
DE3445917A1 (en) * 1984-12-17 1986-06-19 Harting Elektronik Gmbh, 4992 Espelkamp LIFT MAGNET
US5174336A (en) * 1991-05-31 1992-12-29 Allied-Signal Inc. General purpose fluid control valve
DE10110342A1 (en) * 2001-03-03 2002-09-12 Bosch Gmbh Robert actuator
DE10252431A1 (en) * 2002-11-12 2004-05-27 Ina-Schaeffler Kg Electomagnetic hydraulic valve especially three to two way switch for controlling a combustion engine variable valve drive has ring disc holding valve to housing and block

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10475563B2 (en) 2015-05-29 2019-11-12 Bitron S.P.A. Direct current electric actuator, in particular for electrical household appliances

Also Published As

Publication number Publication date
ITTO20050059U1 (en) 2006-11-12
PL1722380T3 (en) 2012-09-28
EP1722380A3 (en) 2009-03-18
ES2387034T3 (en) 2012-09-12
EP1722380A2 (en) 2006-11-15
ATE556417T1 (en) 2012-05-15

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