JPH0193022A - Electromagnetic relay - Google Patents

Abstract

PURPOSE:To improve the coil magnetizing efficiency and the magnetic coil efficiency by providing a permanent magnet at the center in side a U shape iron core furnishing projections at both ends, and arranging an armature positioned opposing to the both magnetic poles and furnished with cuttings responding to the projections of the iron core. CONSTITUTION:When the magnetic pole 1a of a U shape iron core 1 to which a coil is wound and the end 3a of an armature 3 are contacted, the magnetic flux PHI flows the lower side of the end 3a of the armature 3 where the magnetic resistance is the smallest. When the magnetic pole 1a and the armature end 3a are in the apart condition, the magnetic flux passes from the projections 1c and 1d of the iron core 1 to the side of the armature end 3a and tends to flow easily. Therefore, even though the interval (y) between the upper side of the magnetic pole 1a and the armature end 3a is apart, the interval (x) between the projections 1c and 1d which function as a side yoke, and the side of the armature end 3a is kept always constant. Consequently, the leak magnetic flux can be reduced, and the coil magnetizing efficiency and the magnetic coil efficiency can be improved.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an electromagnetic relay.

[Conventional technology]

Conventionally, in this type of electromagnetic relay, as shown in FIGS. 5 and 6, fixed contacts 20 and permanent magnets 21 made of a magnetic material are fixed to an insulator base 30 that functions as a lower winding frame. A movable contact spring in which two external lead-out terminals 22 and a neutral terminal 23 made of a non-magnetic material are implanted, and a movable contact 25 is provided on an armature 24 that makes a tilting movement with both ends of the external lead-out terminals 220 facing each other. 26 is fixed, and the two hinge parts 27 of this movable contact spring 26 are fixed to the neutral terminal 23, and then the insulator cover 2 having the function of an upper winding frame is installed.
8 is fixed and a coil 29 is wound around it. A relay with such a configuration is disclosed in, for example, Japanese Patent Application Laid-Open No. 59-1300.
It is described in Publication No. 34.

[Problem to be solved by the invention]

The conventional electromagnetic relay described above has the following problems due to its structure.

(1) Since the armature 24 is directly excited, a space for movement of the armature is required within the winding portion of the cover 28, and high coil magnetization efficiency cannot be achieved.

(2) High magnetic circuit efficiency cannot be achieved because the magnetic flux leakage is large and the magnetic flux path is not dense.

(3) After winding the coil 29, there is no adjustment means other than magnetization adjustment.

(4) The amount of displacement at the end of the armature 24 (that is, the gap with the terminal 22) is closely related to the dielectric strength determined by the gap between the movable contact 25 and the fixed contact 20.

That is, in order to increase the electrical withstand voltage between the fixed and movable contacts, it is sufficient to increase the amount of displacement at the end of the armature 24, but as a result, the magnetic gap at the end of the armature 24 becomes thicker. The leakage flux in the air gap increases, and the armature 2
In order to obtain sufficient magnetic attraction in this gap at the time of state reversal in step 4, it is necessary to apply a large amount of power to the coil 29.

[Means to solve the problem]

The electromagnetic relay of the present invention includes: a coil assembly configured by arranging a permanent magnet in the center of a U-shaped core around which a coil is wound and a protrusion provided at each end; and both ends of the core. an armature having a notch corresponding to the protrusion of the iron core at both ends of the armature, which is disposed so that the two ends of the armature face each other; an armature assembly in which a hinge spring part that directs a tilting movement to open and open, and a movable contact spring that is linked to the tilting and moving movements of the armature are integrally fixed with an insulator; , the coil assembly is disposed in the opening, and when the armature assembly is disposed such that one end of the permanent magnet serves as a fulcrum for tilting movement of the armature, it faces the movable contact of the movable contact spring. The present invention is characterized by comprising a fixed contact terminal having a fixed contact and an insulator base implanted with a neutral terminal connected to one end of the hinge spring portion.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

Fig. 1 is an exploded perspective view of an embodiment of the present invention, Fig. 2(a)
~(c) is a schematic principle diagram of a magnetic circuit in the same embodiment. This embodiment shows a self-holding type electromagnetic relay. First, to explain the principle with reference to FIGS. 2(a) to (c), a permanent magnet 2 is arranged at the center inside the U-shaped core 1, and a tilting motion is applied to each of the magnetic pole parts la and lb at both ends. Both ends 3a and 3b of the armature 3 are arranged to face each other. The second one shows the non-excited state of the coil 19.
In Figure (a), the end portion 3b of the armature 3 is attracted toward one magnetic pole portion lb by the magnetic flux Φ1 generated by the permanent magnet 2. In FIG. 2(b) showing the excitation state of the coil 19, in the magnetic pole portion 1b, the magnetic flux Φ generated in the iron core 1 due to excitation is
. cancels the magnetic flux Φ1, while at the magnetic pole part 1a the magnetic flux j
is added to the magnetic flux Φ2 of the magnet 2, the armature 3 tilts clockwise about the fulcrum A, and the end portion 3a and the magnetic pole portion 1a come into contact.

In this state, even if the excitation of the coil 19 is cut off, as shown in FIG.
), the armature 3 becomes the magnetic pole la due to the magnetic flux Φ2.
The side becomes attracted. Furthermore, in order to reverse this state (ie, as shown in FIG. 2(a)), the direction of current flowing through the fill 19 may be reversed.

Next, referring to FIG. 1, the entire structure of the electromagnetic relay is integrally fixed by an insulating fixing member 7 to form an armature assembly. Both ends 3a of the armature.

Notches 3c, 3d, and 3e are provided on both sides of the armature 3b (that is, the four corners of the rectangular plate armature 3), respectively.

It is shaped like a crank so that it can In the figure, the two hinge spring parts 5 are bent in a crank shape in opposite directions (that is, point symmetric), but they may be bent in the same direction in a crank shape (that is, line symmetric).

Also, U-shaped iron core 1! A coil 19 is wound around a coil spool 9 in which the coil terminal 8 is embedded, and both ends of the permanent magnet 2 and the core are inserted into the permanent magnet mounting hole 18 provided in the central flange 9a of the spool 9. 1a, lb
Each of them has protrusions 1c, ld, and le on both sides of the core in the width direction, respectively.

If is provided. Each of the projections IC to 1f and each of the notches 3c to 3f of the armature 3 have shapes that correspond to each other so as to mesh with each other. Alternatively, the magnetic piece 11 may be removed and a raised protrusion that contacts the upper end of the permanent magnet may be provided at the center of the lower surface of the armature 3 to serve as a fulcrum for the tilting movement.

Furthermore, a fixed contact terminal 13 to which the fixed contact 12 is fixed.
The neutral terminal 14 and the coil lead-out terminal 15 are each buried in a box with an open top end to form an insulator base 16.

After the above-described coil assembly is fitted inside the insulator base 16 or fixed with an adhesive or the like, the coil terminal 8 and the coil lead-out terminal 15 are connected by a method such as soldering. Further, the armature assembly is mounted by fixing the end of the hinge spring portion 5 and the neutral terminal 14. Finally, the cover 17 is attached to complete the assembly of the electromagnetic relay. In the relay having the above configuration, in accordance with the operating principle described above, the movable contact 4 of the movable contact spring 6 which is integrated by the insulating fixed body 7 and is interlocked with the armature 3, and the fixed contact 12.
Contact and disconnection are made and the electrical circuit is switched.

Next, with reference to FIGS. 3(a) to 3(c), the effects of the above-mentioned projections 1c to 1f and notches 3c to 3f will be explained.

Taking the magnetic pole part ld side as an example, as shown in FIG. 3(a), the shape is such that the projections 1c and ld engage with the notches 3c and 3d. In this structure, when the magnetic pole part 1a of the iron core 1 comes into contact with the armature end part 3a (see FIG. 3(b)
), the magnetic flux Φ passes through the lower surface (contact surface) of the armature end 3a, which has the lowest magnetic resistance, and when the magnetic pole 1a and the armature end 3a are separated from each other, the magnetic flux Φ passes through the lower surface (contact surface) of the armature end 3a, which has the lowest magnetic resistance. , ld, the magnetic flux easily flows through the side surface of the armature end portion 3a. In other words, even if the armature end portion 3a is separated from the upper surface (contact surface) of the magnetic pole portion 1a, the protrusion 1 that acts as a side yoke
The distance X between c and ld and the side surface of the armature end portion 3a is always kept constant. Therefore, the upper surface of the magnetic pole portion 1a and the armature end portion 3
Even if the distance y (that is, the displacement of the armature end 3a) between the projections 1c and ld becomes large and the relationship becomes
- A path for magnetic flux Φ is formed between the armatures 3. As a result, leakage magnetic flux can be reduced, and even if the interval y is made large (that is, even if the dielectric strength between the electrical contacts is made large), a sudden drop in the magnetic attraction force in the armature state can be prevented. As a result, the dielectric strength can be increased even if the current flowing through the coil is small, that is, even if the power consumption is small. FIG. 4 shows the armature displacement at 60 ampere turn of the embodiment shown in FIG. The relationship between y and magnetic attraction force g is shown. In this embodiment, as shown by the solid line A, even if the armature displacement y becomes large, the reduction in the magnetic attraction force during coil excitation is extremely small compared to the broken line C which shows the conventional case.

Furthermore, when applying the present invention to a current holding type relay,
A magnetic air gap may be created by fixing a non-magnetic regular plate to the lower surface of one end of the connector 3 or to one of the magnetic poles of the iron core 1, so that the magnetic attraction force is unbalanced between the two magnetic poles when the iron core is not energized. .

In addition, in the above embodiment, the armature 3 has notches 3c to 3c.
3f, protrusions 1c to 1f are provided on the iron core 1 as a "protrusion",
Moreover, even if the space between the projections 1c and 1d is referred to as a "notch", the structure is the same as that of the embodiment of the present invention.

〔Effect of the invention〕

As explained above, the present invention has a permanent magnet disposed in the center inside the U-shaped core around which a coil is wound, and is tiltable so that both ends of the permanent magnet face both magnetic pole parts having protrusions of the core. A magnetic circuit structure in which an armature is arranged, and an assembly structure that effectively utilizes this magnetic circuit structure, that is, an armature having notches at both ends that engage with the protrusion, a hinge spring, a movable spring, and a contact spring are integrated. armature assembly, iron core,
By constructing the coil assembly with a permanent magnet and a coil terminal attached thereto, and an insulator base in which an external lead-out terminal is buried, the following effects can be obtained.

(1) The magnetic flux of the permanent magnet can be used effectively, so the magnetic circuit is dense, and the magnetization efficiency is high, so it can be driven with high sensitivity.

(2) Since it is a combination of flat components, the mounting height can be reduced.

(3) Since the hinge spring portion is exposed before the cover is put on, the spring load adjustment after assembly can be performed using the support spring portion, making adjustment easy.

(4) Even if the displacement of the armature is increased to increase the withstand voltage, sufficient magnetic attraction force can be obtained with low power.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of an embodiment of the present invention, Fig. 2(a)
~(c) is a schematic principle diagram of the magnetic circuit of the same example, 3rd
Figures (a) to (c) are perspective views and front views showing the state of contact and separation between the armature and the iron core in the same embodiment, Figure 4 is a characteristic diagram illustrating the effects of the same embodiment, and Figure 5 Figure and 6th
The figures are a sectional view and a partial plan view, respectively, showing the structure of a conventional electromagnetic relay. 1...Iron core, 1czlf...Protrusion,
2... Permanent magnet, 3... Armature, 3c
~3f...notch, 4...movable contact, 5...
...Hinge spring part, 6. Group, movable contact spring, 7.
...Insulating fixed body, 11...Magnetic piece, Death...
...Coil terminal, 9...Coil spool,
12... Upper fixed contact, 13... Fixed terminal, 14... Group/neutral terminal, 15... Coil lead-out terminal, 16... Insulator base Stand, 17...
・Cover, 18...Permanent magnet mounting hole, 19
······coil. C (1) Cb) (C) 2nd Figure 3c $ 3 times (a) Kaya, 3 En CC) Ichibunki, Kiri? Nafuyu 1 Rashi 1 Tanii [Dou l (myyt)] 4th Otsu Glue 4

Claims (1)

[Scope of Claims] A coil assembly configured by arranging a permanent magnet in the center of a U-shaped core around which a coil is wound and a protrusion provided at each end; an armature arranged so that its ends face each other and having notches corresponding to the protrusions of the iron core; an armature assembly in which a hinge spring part that supports the tilting movement of the armature and a movable contact spring that moves in conjunction with the tilting movement of the armature are integrally fixed with an insulator; The movable contact spring has a fixed contact that faces the movable contact when the coil assembly is disposed and the armature assembly is disposed such that one end of the permanent magnet serves as a fulcrum for tilting movement of the armature. An electromagnetic relay comprising: an insulator base on which a fixed contact terminal and a neutral terminal connected to one end of the hinge spring portion are planted.