CN110735575B - A door magnetic switch for household appliances - Google Patents
A door magnetic switch for household appliances Download PDFInfo
- Publication number
- CN110735575B CN110735575B CN201911090484.2A CN201911090484A CN110735575B CN 110735575 B CN110735575 B CN 110735575B CN 201911090484 A CN201911090484 A CN 201911090484A CN 110735575 B CN110735575 B CN 110735575B
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- China
- Prior art keywords
- electromagnetic coil
- coil
- metal core
- permanent magnet
- electromagnet
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Classifications
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F15/00—Power-operated mechanisms for wings
- E05F15/60—Power-operated mechanisms for wings using electrical actuators
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05C—BOLTS OR FASTENING DEVICES FOR WINGS, SPECIALLY FOR DOORS OR WINDOWS
- E05C19/00—Other devices specially designed for securing wings, e.g. with suction cups
- E05C19/16—Devices holding the wing by magnetic or electromagnetic attraction
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- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- E05Y2900/00—Application of doors, windows, wings or fittings thereof
- E05Y2900/30—Application of doors, windows, wings or fittings thereof for domestic appliances
- E05Y2900/312—Application of doors, windows, wings or fittings thereof for domestic appliances for washing machines or laundry dryers
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electromagnets (AREA)
- Power-Operated Mechanisms For Wings (AREA)
Abstract
本发明公开一种家用电器门磁开关，包括相互作用的电磁铁组件及永磁体，电磁铁组件包括电磁线圈及金属芯，金属芯固设于电磁线圈内部；电磁线圈与驱动电路电连接，驱动电路上设置有将输入电磁线圈的交流电转换为直流电的整流桥堆，电磁铁本体具有与永磁体相互作用的第一配合端面，永磁体具有与电磁铁本体相互作用的第二配合端面，两个配合端面相向设置，且位置相对应，电磁线圈通电时，第一配合端面的磁极性与第二配合端面的磁极性相同，电磁铁本体与永磁体之间产生相斥力，电磁线圈断电时，电磁铁本体磁性消失，金属芯与永磁体之间产生吸引力。本发明公开的门磁开关通过磁力推开电器门，推力稳定可靠，不会产生噪音，使用寿命长。
The invention discloses a household appliance door magnetic switch, comprising an electromagnet assembly and a permanent magnet that interact with each other, the electromagnet assembly comprising an electromagnetic coil and a metal core, the metal core being fixed inside the electromagnetic coil; the electromagnetic coil is electrically connected to a drive circuit, a rectifier bridge stack for converting the alternating current input into the electromagnetic coil into direct current is arranged on the drive circuit, the electromagnet body has a first mating end face that interacts with the permanent magnet, the permanent magnet has a second mating end face that interacts with the electromagnet body, the two mating end faces are arranged facing each other and in corresponding positions, when the electromagnetic coil is energized, the magnetic polarity of the first mating end face is the same as the magnetic polarity of the second mating end face, a repulsive force is generated between the electromagnet body and the permanent magnet, when the electromagnetic coil is powered off, the magnetism of the electromagnet body disappears, and an attractive force is generated between the metal core and the permanent magnet. The door magnetic switch disclosed by the invention pushes the appliance door open by magnetic force, the thrust is stable and reliable, no noise is generated, and the service life is long.
Description
Technical Field
The invention belongs to the technical field of household appliances, and particularly relates to a door magnetic switch of a household appliance.
Background
The prior household appliance is convenient for users to use, realizes automation, generally controls the door of the household appliance by means of electromagnetic action while opening and closing the door or window by using a mechanical switch, so that the door of the household appliance can be opened without depending on manual operation, but the prior door magnetic switch has the defects that the door can be pushed open by the push rod which is in contact with the door of the electric appliance only by controlling the push rod to move by using an electromagnet, and the electromagnet needs to apply enough thrust to the push rod to overcome locking force, so that the push rod can generate great noise when striking the door of the electric appliance, frequent impact can damage the door of the electric appliance, and enough installation space is needed to be provided for matching with the movement of the push rod to influence the compactness of the structure of the electric appliance.
Disclosure of Invention
The invention provides a door magnetic switch of a household appliance for solving the technical problems.
The invention aims at realizing the following technical scheme:
The door magnetic switch of the household appliance comprises an interacted electromagnet assembly and a permanent magnet, wherein the electromagnet assembly comprises an electromagnet body and a driving circuit, the electromagnet body comprises an electromagnetic coil and a metal core which can be magnetized by the magnetic field of the electromagnetic coil, the metal core is fixedly arranged inside the electromagnetic coil, the electromagnetic coil is electrically connected with the driving circuit, a rectifier bridge stack which converts alternating current input into the electromagnetic coil into direct current is arranged on the driving circuit so as to keep the polarity of the electromagnetic coil fixed when the electromagnetic coil is electrified, the electromagnet body is provided with a first matching end face which interacts with the permanent magnet, the permanent magnet is provided with a second matching end face which interacts with the electromagnet body, the two matching end faces are oppositely arranged and correspond in position, when the electromagnetic coil is electrified, the magnetic polarity of the first matching end face is identical with the magnetic polarity of the second matching end face, repulsive force is generated between the electromagnet body and the permanent magnet, when the electromagnetic coil is powered off, the magnetism of the electromagnet body disappears, and attractive force is generated between the metal core and the permanent magnet. According to the technical scheme, the polarity of the electromagnet body is fixed through the arrangement of the rectifier bridge stack, the matching requirement between the electromagnet body and the permanent magnet is met, compared with a push rod in mechanical movement, the magnetic force is more stable and reliable, the service life is longer, damage to an electric appliance door cannot be caused, a metal core is fixedly arranged in the electromagnetic coil, when the electric appliance door needs to be opened, the electromagnetic coil is electrified, the metal core is magnetized by the magnetic field of the electromagnetic coil, the magnetized iron core also becomes a magnet, and therefore, as the magnetic poles of the two matching end faces are consistent, the two matching end faces repel each other, the permanent magnet drives the electric appliance door to move backwards to open the electric appliance door, the electromagnetic coil is powered off, the magnetism of the metal core disappears, attractive force is generated between the permanent magnet and the permanent magnet, and when the electric appliance door needs to be closed, the permanent magnet on the electric appliance door can be attracted on the metal core.
Preferably, the driving circuit is provided with a PTC resistor, and the PTC resistor is connected in series between the power input terminal and the rectifier bridge stack. The PTC resistor can prevent the electromagnetic coil from being electrified and heated for a long time to cause overhigh temperature rise so as to stabilize the service performance of the door magnetic switch.
Preferably, the electromagnetic coil is wound on a coil frame, the coil frame comprises two opposite outer end walls and two opposite inner end walls, a coil column is arranged between the outer end walls and the inner end walls, the coil column is a hollow cylinder, and the electromagnetic coil is wound on the outer peripheral surface of the coil column. Through the setting of coil former, can make the structure of electro-magnet body more firm, the coil column core adopts cylindrically, and the solenoid of winding above that is also cylindrical, can make solenoid produce the magnetic field of alignment along the axial, makes its thrust to the electrical door more reliable and stable.
Preferably, the metal core comprises a cylindrical main body part and a limiting part positioned at the rear end of the main body part, and the main body part is tightly embedded in the coil column and is coaxially arranged with the coil column. The coaxial arrangement of the metal core and the coil column can strengthen the magnetic field of the electromagnet body and enable the structure of the electromagnet body to be more compact.
Preferably, the limiting part comprises a limiting boss and a connecting column positioned between the limiting boss and the main body part, wherein the limiting boss, the connecting column and the main body part are coaxially arranged, and the outer diameter of the limiting boss is smaller than that of the main body part, but larger than that of the connecting column. The setting of spacing portion is in order to guarantee the installation steadiness of metal core, avoids its axial forward and backward movement under the effect of magnetic force.
Preferably, one end of the coil column, which is close to the inner end wall, is a limiting end, a limiting convex edge is arranged on the inner wall of the limiting end along the circumferential direction, and when the metal core is embedded in the coil column, the rear end face of the main body part of the metal core abuts against the limiting convex edge. When the electromagnet body and the permanent magnet generate repulsive force, the limiting convex edges are matched with the limiting parts of the metal cores, so that the metal cores can be effectively prevented from moving backwards along the axial direction.
Preferably, the limit end of the coil post is buckled with an end cover, the limit part of the metal core is limited in the end cover, and the outer peripheral surface of the annular side wall of the end cover is provided with clamping holes matched with the limit convex edges along the circumferential direction. The spacing bead clamps in the card hole, can further improve the installation steadiness of metal core.
Preferably, the annular side wall of the end cover comprises a diameter reduction section and a diameter expansion end, the inner diameter of the diameter reduction end is matched with the outer diameter of the connecting column, the inner diameter of the diameter expansion end is matched with the outer diameter of the limiting boss, the connecting column is limited at the diameter reduction end, and the limiting boss is limited at the diameter expansion end. When the permanent magnet generates attractive force to the metal core, the limit part of the metal core is matched with the end cover and the limit convex edge, so that the metal core can be effectively prevented from moving forward along the axial direction and is pulled out by the permanent magnet.
Preferably, the central axis of the metal core is perpendicular to the first mating end face. The arrangement can enable the interaction force between the electromagnet body and the permanent magnet to be more reliable and effective.
Preferably, the first mating end face of the electromagnet body is flush with the outer end wall of the coil former. The arrangement can ensure that the electromagnet body is contacted with and matched with the permanent magnet more reliably.
Preferably, the metal core is made of soft iron or silicon steel material. Soft iron or silicon steel is adopted as a metal core, so that the metal core can be demagnetized immediately after the electromagnetic coil is powered off, and the permanent magnet can be adsorbed on the metal core.
Preferably, the magnetic field strength of the electromagnet body at the position 0.5mm away from the surface of the central surface of the metal core is more than or equal to 180mT under rated voltage.
Preferably, the magnetic field intensity of the second matching end surface of the permanent magnet is more than or equal to 400mT.
Preferably, the electromagnetic thrust of the electromagnet body to the permanent magnet is more than or equal to 45N under the rated voltage.
Preferably, the polarity of the first matching end surface of the electromagnet body is an N pole, and the polarity of the second matching end surface of the permanent magnet is also an N pole.
Compared with the prior art, the door magnetic switch disclosed by the invention has the beneficial effects that the door magnetic switch pushes the electric appliance door through magnetic force, compared with the thrust exerted by the push rod, the door magnetic switch is more stable and reliable, does not generate noise and has long service life, the metal core is fixedly arranged in the electromagnetic coil, a displacement space is not required to be provided for the metal core, the whole door magnetic switch is more compact in structure, the installation space is saved, the installation stability of the metal core can be ensured through improving the structure of the metal core and the coil rack, and the metal core is prevented from moving axially under the action of magnetic force by matching with the end cover, so that the reliability of the door magnetic switch is further improved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of an electromagnet assembly according to the present invention;
FIG. 3 is a schematic diagram of the internal structure of an electromagnet assembly according to the present invention;
FIG. 4 is a schematic diagram of another internal structure of an electromagnet assembly according to the present invention;
FIG. 5 is a schematic diagram of a driving circuit according to the present invention;
FIG. 6 is a schematic diagram of a coil former according to the present invention;
FIG. 7 is a schematic view of a metal core structure according to the present invention;
FIG. 8 is a schematic diagram of an end cap structure according to the present invention;
the drawing shows a 10 electromagnet assembly, a 11 first matching end face, a 12 outer shell, a 13 metal core, a 131 main body part, a 132 connecting part, a 133 limiting boss, a 14 coil rack, a 141 coil column, a 142 outer end wall, a 143 inner end wall, a 144 limiting convex edge, a 15 rectifier bridge stack, a 16 PTC resistor, a 17 electromagnetic coil, a 18 end cover, a 181 clamping hole and a 20 permanent magnet.
Detailed Description
The invention is further described below with reference to embodiments shown in the drawings in which:
referring to fig. 1-8, the present embodiment discloses a door magnetic switch of a household appliance, which comprises an electromagnet assembly 10 and a permanent magnet which are interacted and separately arranged, and is applied to a drum washing machine, wherein the electromagnet assembly 10 is installed at the rear of the front wall of the washing machine body, and the permanent magnet is integrated in the door of the washing machine; the electromagnet assembly 10 comprises an electromagnet body and a driving circuit, wherein the electromagnet body comprises an electromagnetic coil 17 and a metal core 13 which can be magnetized by a magnetic field of the electromagnetic coil 17, the metal core 13 is fixedly arranged inside the electromagnetic coil 17, the electromagnetic coil 17 is electrically connected with the driving circuit, a rectifier bridge 15 which converts alternating current input into the electromagnetic coil 17 into direct current is arranged on the driving circuit so as to keep the polarity of the electromagnetic coil 17 fixed when the electromagnetic coil 17 is electrified, the polarity of the electromagnet body can be fixed through the arrangement of the rectifier bridge 15, the matching requirement between the electromagnet body and a permanent magnet is met, compared with a push rod which mechanically moves, the magnetic force is more stable and reliable, the service life is longer, the damage to an electric appliance door can not be caused, the electromagnet body is provided with a first matching end face 11 which interacts with the permanent magnet, the permanent magnet is provided with a second matching end face which interacts with the electromagnet body, the two matching end faces are oppositely arranged, and the positions of the two matching end faces correspond, when the electromagnetic coil 17 is electrified, the magnetic polarities of the first matching end face 11 and the second matching end face are the same, the magnetic polarities of the first matching end face 11 and the second matching end face are N poles, the magnetic force between the electromagnet body and the permanent magnet 17 can be exerted when the magnetic force is generated between the electromagnet body and the electromagnetic coil 17 and the magnetic core 13 is required to be released, and the magnetic attractive force between the two permanent magnet door and the electromagnet door is required to be opened when the electromagnet door is required to be opened, the electromagnetic coil 17 is electrified, the metal core 13 is magnetized by the magnetic field of the electromagnetic coil 17, and the magnetized iron core also becomes a magnet, so that the magnetic field intensity of the electromagnet body is enhanced due to the mutual superposition of the two magnetic fields, the electromagnet body is ensured to provide enough thrust for the washing machine door to overcome the locking force to open the washing machine door, when the washing machine door is closed, the electromagnetic coil 17 is powered off, the magnetism of the metal core 13 can disappear, attractive force is generated between the electromagnet body and the permanent magnet, and the locking force of the washing machine door is increased.
The driving circuit is connected with the rectifier bridge 15 and is also provided with a PTC resistor 16, the PTC resistor 16 is connected between the power input end and the rectifier bridge 15 in series, and the arrangement of the PTC resistor 16 can prevent the electromagnetic coil 17 from being electrified and heated for a long time while ensuring the electromagnetic coil 17 to work under rated current, so that the temperature rise is too high, and the service performance of the door magnetic switch is stabilized.
The electromagnetic coil 17 is wound on the coil rack 14, the coil rack 14 comprises two oppositely arranged outer end walls 142 and inner end walls 143, a coil column 141 is arranged between the outer end walls 142 and the inner end walls 143, the coil column 141 is a hollow cylinder, the electromagnetic coil 17 is wound on the outer peripheral surface of the coil column 141, the structure of the electromagnet body can be more stable through the arrangement of the coil rack 14, the coil column 141 adopts a cylindrical shape, the electromagnetic coil 17 wound on the coil column 141 is also cylindrical, and an aligned magnetic field can be generated by the electromagnetic coil along the axial direction, so that the thrust to the electric appliance door is more stable and reliable.
In order to ensure the installation stability of the metal core 13 and prevent the metal core 13 from moving axially under the action of magnetic force, the metal core 13 comprises a cylindrical main body part 131 and a limit part positioned at the rear end of the main body part 131, wherein the main body part 131 is tightly embedded in the coil column 141 and is coaxially arranged with the coil column 141, the limit part comprises a limit boss 133 and a connecting column 132 positioned between the limit boss 133 and the main body part 131, the limit boss 133 and the connecting column 132 are coaxially arranged, the outer diameter of the limit boss 133 is smaller than the outer diameter of the main body part 131 but larger than the outer diameter of the connecting column 132, the limit part is arranged to ensure the installation stability of the metal core 13 and prevent the metal core 13 from moving axially forwards and backwards under the action of magnetic force, one end of the coil column 141 close to the inner end wall 143 is a limit end, the inner wall of the limit end is circumferentially provided with a limit lug 144, when the metal core 13 is embedded in the coil column 141, the rear end face of the main body part 131 abuts against the limit lug 144, when the electromagnet body generates a repulsive force with the permanent magnet, the limit part of the limit lug 144 can effectively match with the metal core 13, the limit part of the limit lug 13 can move axially along the axial direction, the limit part is arranged at the end cap 18 is matched with the inner diameter of the annular end cap 181 of the annular end cap 18, the limit end cap 18 is matched with the end cap 18, the end cap 181, the end cap 18 is formed by the end cap 18 is further matched with the end cap 18, the end cap 18 is arranged at the end cap 18, 18 has 18, and the end 18 has a diameter-expanded end cap 18, can closely cooperate with the spacing portion of metal core 13 and coil post 141, when the permanent magnet produced the appeal to metal core 13, can effectively avoid metal core 13 along the axial forward movement through the cooperation of spacing portion of metal core 13 with end cover 18 and coil former 14, pulled out by the permanent magnet.
In order to enable the metal core 13 to be demagnetized immediately after the electromagnetic coil is powered off, the permanent magnet can be adsorbed to the metal core 13, in the embodiment, the metal core 13 is made of soft iron, the central axis of the metal core 13 is perpendicular to the first matching end face 11 and is perpendicular to the front wall of the washing machine, the arrangement enables interaction force between the electromagnet body and the permanent magnet to be more reliable and effective, the first matching end face 11 of the electromagnet body is flush with the outer end wall 142 of the coil rack 14 for enabling contact and matching of the electromagnet body and the permanent magnet to be more reliable, and the electromagnet body, the rectifier bridge stack 15 and the PTC resistor 16 are sealed in the shell 12, and only the first matching end face 11 and the outer end wall 142 of the coil rack 14 are exposed out of the shell 12 and flush with the side wall of the shell 12.
The rated voltage of the electromagnetic coil 17 is AC 220V (+ -10%), the magnetic field strength of the electromagnet body at the rated voltage is 200mT at the position 0.5mm away from the surface of the central surface of the metal core 13, the permanent magnet material in this embodiment is neodymium iron boron, the magnetic field strength of the permanent magnet body at the second mating end surface is 430mT, and the electromagnetic thrust of the electromagnet body to the permanent magnet is 60N at the rated voltage, so that the door of the washing machine can be opened against the lock and force.
The household appliance door magnetic switch disclosed by the invention has the advantages of compact structure, small volume, long service life and stable and reliable magnetic force, the electromagnet body can generate repulsive force to the permanent magnet on the appliance door when being electrified, so that the appliance door is pushed open, when the power is off, the magnetic force of the metal core 13 disappears to generate attractive force to the permanent magnet on the appliance door, so that the locking and the force of the appliance door are enhanced, and the metal core 13 has double functions under the action of the magnetic force.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911090484.2A CN110735575B (en) | 2019-11-08 | 2019-11-08 | A door magnetic switch for household appliances |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911090484.2A CN110735575B (en) | 2019-11-08 | 2019-11-08 | A door magnetic switch for household appliances |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110735575A CN110735575A (en) | 2020-01-31 |
| CN110735575B true CN110735575B (en) | 2025-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911090484.2A Active CN110735575B (en) | 2019-11-08 | 2019-11-08 | A door magnetic switch for household appliances |
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| CN (1) | CN110735575B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1715527A (en) * | 2004-07-02 | 2006-01-04 | 金羚电器有限公司 | Washing machine using electromagnet to drain water and its electromagnet member for draining water |
| CN1884673A (en) * | 2005-06-23 | 2006-12-27 | 乐金电子(天津)电器有限公司 | Washing machine and control method thereof |
| CN202648302U (en) * | 2012-04-26 | 2013-01-02 | 澳柯玛股份有限公司 | Electric refrigerator with touch-type door body opening and closing device |
| CN211173644U (en) * | 2019-11-08 | 2020-08-04 | 浙江宏昌电器科技股份有限公司 | Door magnetic switch for household electrical appliance |
-
2019
- 2019-11-08 CN CN201911090484.2A patent/CN110735575B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1715527A (en) * | 2004-07-02 | 2006-01-04 | 金羚电器有限公司 | Washing machine using electromagnet to drain water and its electromagnet member for draining water |
| CN1884673A (en) * | 2005-06-23 | 2006-12-27 | 乐金电子(天津)电器有限公司 | Washing machine and control method thereof |
| CN202648302U (en) * | 2012-04-26 | 2013-01-02 | 澳柯玛股份有限公司 | Electric refrigerator with touch-type door body opening and closing device |
| CN211173644U (en) * | 2019-11-08 | 2020-08-04 | 浙江宏昌电器科技股份有限公司 | Door magnetic switch for household electrical appliance |
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| CN110735575A (en) | 2020-01-31 |
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