JPH11213836A - Electromagnetic relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a single stabilized electromagnetic relay having a contactor capable of stable oscillation, even when impact is applied to the electromagnetic relay. SOLUTION: This electromagnetic relay is provided with an iron core which is wound with a coil so that both ends thereof are formed into magnetic pole parts, a permanent magnet 2 magnetized with the same polarity at both longitudinal ends 2b, 2c thereof for magnetizing both ends magnetic pole parts of the iron core and magnetized with a different polarity at a central part thereof, an armature provided in a condition such that a part supported freely oscillatably like a seesaw movement is overlapped with a central part in the longitudinal direction of the permanent magnet 2 and that both the ends thereof are attracted and released to/from both end magnetic pole parts of the iron core, a movable spring having a movable contact in both ends thereof and a central part fixed integrally to the armature along nearly in parallel with the longitudinal direction of the armature, and a base provided with a fixed contact, to/from which the movable contact approaches or separates. In this case, the permanent magnet 2 is provided with a notch part 2a so that volume is different in both sides of the central part in the longitudinal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay in which an armature operates as a seesaw.

[0002]

2. Description of the Related Art Conventionally, as this type of electromagnetic relay, FIG.
11 to FIG. This one has magnetic ends
Extreme part A₁, A_TwoIron core A on which coil B is wound so that
Supported part C supported swingably for seesaw operation₁
Is provided at both ends C_Two, C_ThreeIs the magnetic pole part A at both ends of the iron core A₁, A_Two
Armature C, which is released by suction, and both ends of iron core A
Extreme part A₁, A_TwoBoth ends in the longitudinal direction are magnetized to have the same polarity in the middle
Are magnetized to different poles, and
Moving contact E₁, E_TwoAlong the direction substantially parallel to the longitudinal direction of the armature C
The movable spring E has a central part integrally fixed to the armature C.
And movable contact E₁, E _TwoFixed contact F₁, F_TwoEstablished
And a base F.

More specifically, the permanent magnet D is formed in a substantially flat plate shape.
And both ends D in the longitudinal direction₁, D_TwoAre both S poles, central part
The magnets are magnetized at three points so that the deviated part becomes the N pole.
D₁, D _TwoIs the magnetic pole A at both ends of the iron core₁, A_TwoArranged to be located inside
Is done. Thus, the permanent magnet D is more biased than the central part.
Is magnetized so as to be the N pole.
As described in detail, a monostable operation is performed.

Next, the operation will be described. When the coil B is energized, the armature C is attracted at one end C ₂ to the one end magnetic pole A ₁ of the iron core A in accordance with the direction of the magnetization, and swings around the supported portion C ₁ as a fulcrum, thereby being movable. Normally open (Noma) at one end of spring E
l Open) movable contact E ₁ is a side called NO side contact abuts the fixed contact F _2.

[0005] Here, when stopping the energization of the coil B, armature C is the other end portion C ₃ is attracted to the other magnetic pole portion A ₂ of the iron core A reversed swinging, the other end of the movable spring E Normally closed (Noma
l Close) movable contact E ₂ is a so-called NC side contact comes into contact with the fixed contact F ₂ back to the original state.

[0006]

In the above-mentioned conventional electromagnetic relay, the permanent magnet D is magnetized such that a portion deviated from a central portion serving as a supporting portion for supporting the armature C becomes an N pole. Therefore, the attraction force between the armature C and the armature C is weak, and when an impact or the like is applied, the armature C may be displaced and the swing operation may become unstable.

The present invention has been made in view of the above points, and an object thereof is to provide a monostable electromagnetic relay in which an armature swings stably even when subjected to an impact or the like. Is to do.

[0008]

In order to solve the above-mentioned problems, according to the first aspect of the present invention, an iron core on which a coil is wound so that both ends are magnetic pole portions, and a magnetic pole portion at both ends of the iron core are provided. A permanent magnet magnetized at both ends in the longitudinal direction having the same polarity and a central portion magnetized to different polarities, and a supported portion swingably supported so as to perform a seesaw operation are provided at the central portion in the longitudinal direction of the permanent magnet. An armature that is provided in a superposed state and whose both ends are attracted and released to both ends of the magnetic pole of the iron core, and a movable contact is provided at both ends, and the central portion is provided with the armature so as to be substantially parallel to the longitudinal direction of the armature. An electromagnetic relay comprising: a movable spring integrally fixed; and a base provided with a fixed contact with which the movable contact comes and goes, wherein the permanent magnet has a volume on both sides of a central portion in the longitudinal direction. Are notched so as to be different from each other to provide a cutout portion.

According to a second aspect of the present invention, in the first aspect of the present invention, a molding material for forming the base integrally formed with the coil enters between the permanent magnet and the base. The notch has a configuration provided with an opening on the coil side.

According to a third aspect of the present invention, in the second aspect of the present invention, the notch is provided with an inner edge for increasing an opening cross-sectional area at a location farther from the opening. is there.

According to a fourth aspect of the present invention, in the third aspect of the invention, the cutout portion is provided so as to penetrate an opposite surface opposite to the coil side.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the concave portion communicating with the notch has a concave portion communicating with the notch portion on the opposite surface up to a central portion in the longitudinal direction. It is a configuration provided along.

According to a sixth aspect of the present invention, in the invention of the fifth aspect, the entire surface of the permanent magnet is covered along the opposite surface by the molding material entering from the notch.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

Numeral 1 denotes an iron core, which is made of a magnetic material, and whose both leg portions are formed in a substantially U-shape as magnetic pole portions 1a and 1b, and a coil 1d is wound around a portion separated by both integrally formed coil bobbins 1c. Have been.

Reference numeral 2 denotes a permanent magnet which is formed in a substantially flat plate shape, and is cut out between a central portion in the longitudinal direction and one end thereof so that the volumes on both sides of the central portion are different. A cutout 2a penetrating through the opposite surface on the opposite side is provided. This permanent magnet 2 has a coil 2
This means that an opening is provided also on the 1d side. This permanent magnet 2 is magnetized at three points so that both ends 2b and 2c are S poles and the center is an N pole, and both ends 2b and 2c are inside the both ends magnetic poles 1a and 1b of the iron core 1. They are arranged so as to be positioned respectively and are welded to the iron core 1.

Reference numeral 3 denotes an armature, which is formed of a magnetic material and is formed in a substantially rectangular flat plate shape so that both ends 3a and 3b in the longitudinal direction can face both end magnetic poles 1a and 1b of the iron core 1. In the center portion of the rim is provided a ridge-shaped supported portion 3c which is swingably supported so as to perform a seesaw operation in a state of being superposed on the center portion of the permanent magnet 2.

Reference numeral 4 denotes a movable spring, which is formed in a long shape from a thin leaf spring material such as a copper alloy, and has a movable contact 4a at its tip.
However, a movable contact 4b is fixed to the other end, respectively, and a central portion is fixed to the armature 3 by integral molding with the insulator 4c so as to be substantially parallel to the longitudinal direction of the armature 3.

Reference numeral 5 denotes a support spring, and first extension pieces 5a and first extension pieces extending from the movable springs 4 provided on both sides of the armature 3 in the short direction of the armature 3, respectively. The second extension piece 5b extends from the piece 5a along the movable spring 4.

Reference numeral 6 denotes a base, which is formed integrally with the coil 1d by a molding material and is formed in a substantially rectangular parallelepiped shape, and the molding material enters between the coil and the permanent magnet 2. The base 2 has a fixed contact 6a at one end in the longitudinal direction, a fixed contact 6b at the other end, and a fixed terminal strip 6c connected to the fixed contacts 6a and 6b, and a coil 1d. The coil terminal strip 6d, the support 6e provided in the recess at the center in both longitudinal sides, and the common terminal strip 6f connected thereto are integrally formed by a conductive plate. This base 6
The second extension piece 5b of the support spring 5 is spot-welded to the support portion 6e, and the movable spring 4 and the common terminal piece 6f are connected. A case 7 is fitted on the base 6.

Next, the operation will be described. When the coil 1d is energized, one end 3a of the armature 3 is attracted to one end of the magnetic pole 1a of the iron core 1 in accordance with the direction of magnetization, and the supported portion 3c overlaps the longitudinal center of the permanent magnet. In detail, the see-saw operation is performed on the center of the permanent magnet in the longitudinal direction.
The movable contact 4a, which is a so-called NO side contact, contacts the fixed contact 6a.

When the energization of the coil is stopped, the other end 3b of the armature 3 is attracted to the other end magnetic pole 1b of the iron core 1 and reciprocally swings, and is provided at the other end of the movable spring 4. Normally closed
The movable contact 4b, which is a so-called NC-side contact, contacts the fixed contact 6b and returns to the original state.

In such an electromagnetic relay, the permanent magnet 2
The notch 2a is cut out so that the volumes on both sides are different with respect to the center part in the longitudinal direction, so that the attractive force between the end of the smaller longitudinal direction and the armature 3 is provided. When the energization of the coil 1d is stopped, the portion where the attraction force is weakened is separated, and the magnetized point is biased toward one end in the longitudinal direction for monostable operation. The magnetized point can be overlapped with the supported portion 3c of the armature 3, and the attractive force between the supported portion 3c of the armature 3 and the magnetized point can be shifted in any longitudinal direction. Because it is larger than the conventional example that is biased toward the end, even when receiving an impact etc., the armature 3 does not shift,
The rocking operation can be performed stably.

The permanent magnet 2 is provided at a position where a notch 2a is formed by notching the coil 1d.
Because the distance between the and is locally large, the base 6
Is easy to enter between the permanent magnet 2 and the coil 1d, and a gap due to no entry of the molding material is less likely to occur.

In the permanent magnet 2, the notch 2a has a coil 1d.
By being provided so as to penetrate the opposite surface opposite to the side, the contact area with the molding material that has entered the notch 2a becomes larger than when the notch 2a is provided in a non-penetrating state. Therefore, it can be firmly fixed by the molding material.

Next, a second embodiment of the present invention will be described below with reference to FIGS. The members having substantially the same functions as those of the first embodiment are denoted by the same reference numerals,
Only different points from the first embodiment will be described. In this embodiment,
Basically, the configuration is the same as that of the first embodiment, but the cutout portion 2a is provided with an inner edge portion that increases the opening cross-sectional area at a location farther from the opening portion provided on the coil 1d side. Is different.

More specifically, the inner edge of the notch 2a is
The opening provided on the side opposite to the coil 1d side is provided with a taper so that the opening cross-sectional area is larger than the opening provided on the side.

In this electromagnetic relay, in addition to the effect of the first embodiment, the molding material for forming the base 6 increases the opening cross-sectional area at a location farther from the opening provided on the coil 1d side. When the hardening material enters further than the inner edge and hardens, the hardened molding material does not come out of the opening provided on the coil 1d side.

Next, a third embodiment of the present invention will be described below with reference to FIGS. The members having substantially the same functions as those of the second embodiment are denoted by the same reference numerals,
Only different points from the second embodiment will be described. In this embodiment,
Basically, the configuration is the same as that of the second embodiment. However, the permanent magnet 2 has a concave portion 2d communicating with the notch portion 2a up to a central portion in the longitudinal direction, and an opposite surface opposite to the coil 1d side. The difference is that they are provided along.

In such an electromagnetic relay, in addition to the effect of the second embodiment, the molding material that has entered the notch 2a is:
Up to the central portion in the longitudinal direction communicating with the notch portion 2a, it enters the concave portion 2d provided along the opposite surface opposite to the coil 1d side, and the molding material that enters the concave portion 2d and hardens is formed. Since the supported portion 3c of the armature 3 is swingably supported, wear powder that may be generated when the metal material swingably supports the supported portion 3c of the armature 3 is not generated. .

Next, a fourth embodiment of the present invention will be described below with reference to FIG. Note that members having substantially the same functions as those of the third embodiment are denoted by the same reference numerals, and only the differences from the third embodiment will be described. This embodiment has basically the same configuration as that of the third embodiment. However, the permanent magnet 2 is formed on the opposite surface on the side opposite to the coil 1d side by the molding material entered from the cutout 2a. The difference is that the entire surface is covered along.

In this electromagnetic relay, in addition to the effect of the third embodiment, the permanent magnet 2 is entirely formed along the opposite surface opposite to the coil 1d side by the molding material entered from the notch 2a. Is covered, the coil 1d and the contact
The insulating properties between 4a, 4b, 6a, and 6b are improved, and the withstand voltage is improved.

In the first embodiment, the notch 2a is provided with an opening on the coil 1d side.
When there is no possibility that a gap due to the intrusion of the molding material does not occur, the coil may not be provided with an opening on the coil 1d side.

In the first and second embodiments, the permanent magnet 2 is provided with the notch 2a penetrating therethrough.
If the cutouts are provided so that the volumes on both sides are different from each other across the central part in the longitudinal direction, even if they are not provided in a penetrated state, it is possible to stably swing. Can be.

In the second to fourth embodiments, the notch
Although the inner edge of 2a is provided with a taper, the opening cross-sectional area of the opening on the side opposite to the coil 1d side is gradually larger than that of the opening on the coil 1d side. The same effect can be obtained even when the opening cross-sectional area is locally increased.

[0036]

According to the first aspect of the present invention, the notch is provided so that the volume of each side of the permanent magnet is different from each other across the center in the longitudinal direction. The attraction between the armature in the direction and the armature becomes weaker, so when the coil is de-energized, the part where the attraction is weakened will be separated, and the magnetized magnet will be magnetized to perform monostable operation. Since the point does not have to be biased toward any one of the ends in the longitudinal direction, the supported portion of the armature and the magnetized point can be superimposed, and the attractive force between the supported portion of the armature and the supported portion can be reduced. Since the magnetized point is larger than the conventional example in which the magnetized point is biased toward one of the ends in the longitudinal direction, even when subjected to an impact or the like, the armature does not shift, and the swinging operation can be performed stably. it can.

According to a second aspect of the present invention, in addition to the effect of the first aspect of the present invention, in the permanent magnet, the gap between the coil and the notch portion cut out from the coil side is locally increased. As a result, the molding material for forming the base easily enters between the permanent magnet and the coil, and a gap due to no molding material entering hardly occurs.

According to a third aspect of the present invention, when the molding material for forming the base further penetrates and hardens the inner edge portion which increases the cross-sectional area of the opening farther from the opening, the cured molding material becomes , Does not come out of the opening.

According to a fourth aspect of the present invention, in addition to the effect of the second or third aspect, in the permanent magnet, the cutout portion of the permanent magnet penetrates the opposite surface opposite to the coil side. By being provided in the state, the contact area with the molding material that has entered the notch becomes larger than when the notch is provided in a non-penetrating state, so that the molding material can be firmly fixed.

According to a fifth aspect of the present invention, in addition to the effect of the fourth aspect, the molding material that has entered the notch is provided along the opposite surface up to the center in the longitudinal direction in communication with the notch. Into the recessed portion, and the molding material that has entered the recessed portion and hardened supports the supported portion of the armature in a swingable manner, so that the metal material swings the supported portion of the armature. When it is movably supported, no abrasion powder that may be generated is generated.

According to a sixth aspect of the present invention, in addition to the effect of the fifth aspect of the present invention, the entire surface of the permanent magnet is coated along the opposite surface with the molding material entering from the notch, so that the coil is The insulation between the contact and the contact is improved, and the withstand voltage is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a permanent magnet according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the same.

FIG. 3 is a cross-sectional view showing a state where the armature is supported swingably.

FIG. 4 is a sectional view showing a state in which an armature according to a second embodiment of the present invention is swingably supported.

FIG. 5 is a perspective view of the same permanent magnet.

FIG. 6 is a sectional view showing a state in which an armature according to a third embodiment of the present invention is swingably supported.

FIG. 7 is a perspective view of the same permanent magnet.

FIG. 8 is a sectional view showing a state in which an armature according to a fourth embodiment of the present invention is swingably supported.

FIG. 9 is an exploded perspective view of a conventional example.

FIG. 10 is a cross-sectional view showing a state in which the above armature is swingably supported.

FIG. 11 is a perspective view of the same permanent magnet.

[Explanation of symbols]

 1 Iron core 1a Magnetic pole 1b Magnetic pole 1d Coil 2 Permanent magnet 2a Notch 2d recess 3 Armature 4 Movable spring 4a Movable contact 4b Movable contact 6 Base 6a Fixed contact 6b Fixed contact

Claims (6)

[Claims] 1. An iron core on which a coil is wound so that both ends become magnetic pole portions, and both ends in the longitudinal direction for magnetizing the magnetic pole portions at both ends of the iron core are magnetized to have the same polarity and the central portion is magnetized to different poles. A permanent magnet and a supported part that is swingably supported so as to operate as a seesaw are provided in a state of being superimposed on the central part in the longitudinal direction of the permanent magnet, and both ends are attracted and released to both end magnetic pole parts of the iron core, respectively. Armature, movable contacts provided at both ends thereof, a movable spring having a central portion integrally fixed to the armature so as to be substantially parallel to the longitudinal direction of the armature, and a fixed contact with which the movable contact is separated. And a base, wherein the permanent magnet is provided with a cut-out portion which is cut out so as to have different volumes on both sides with respect to a central portion in the longitudinal direction. 2. A molding material for forming the base integrally formed with the coil enters between the permanent magnet and the notch, the notch having an opening on the coil side. The electromagnetic relay according to claim 1, wherein the electromagnetic relay is provided. 3. The electromagnetic relay according to claim 2, wherein the notch is provided with an inner edge that increases an opening cross-sectional area at a location farther from the opening. 4. The electromagnetic relay according to claim 2, wherein the cutout portion is provided so as to penetrate an opposite surface opposite to the coil side. 5. The electromagnetic relay according to claim 4, wherein the permanent magnet has a concave portion communicating with the cutout portion provided along the opposite surface to a central portion in a longitudinal direction. 6. The electromagnetic relay according to claim 5, wherein the entire surface of the permanent magnet is coated along the opposite surface with the molding material entered from the notch.