JPS61168831A - Electromagnetic relay - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electromagnetic relay, and more particularly to an electromagnetic relay having a permanent magnet.

[Conventional technology]

The applicant had previously filed a patent application for this type of electromagnetic relay in 1983-2.
The structure described in No. 10744 is proposed.

This electromagnetic relay will be described with reference to FIG.
A card 11 that holds the movable block 4 fixed to both magnetic poles, an iron core 1 whose one end 1a is disposed between the magnetic pole plate ends 5a and 6a, and an end that is magnetically connected to the iron core 1. an insulating base having a yoke 2 in which 2a and 2b are arranged facing each other on the outside of magnetic pole plate ends 5b and 6b, a coil spool 21 around which a coil 3 is wound, and a contact switching mechanism driven by the movement of a card 11; 30 and a cover 40.

A movable block 4 composed of a permanent magnet 7 and two U-shaped magnetic pole plates 5 and 6 is held by a movable block holding portion 12 of a card 11, and constitutes a card block 10. From the upper end of the movable contact spring drive unit 13 having the studs 131 provided at the rear of both sides of the card 11,
A guide groove 14 is integrally formed to form a letter shape. The coil block 20 is assembled by assembling the yoke 2 from below onto the coil spool 21 around which the coil 3 is wound, and by driving the iron core 1 inserted through the insertion hole 22 of the coil spool 21 into the fitting hole 2C of the yoke 2. It consists of Two guide bins 24 are provided on the collar 23, and each guide bin 24 is connected to the card block 10.
is fitted into each guide groove 14. Brim part 25
A coil terminal 26 is provided at . The insulating base 30 has a fitting groove 31 in the center for fitting the coil block 20, and on both sides of the fitting groove 31, one end of the movable contact spring 32 or a spring fixed terminal 33 is welded and fixed, and the other end is a free end. It is arranged so that. Fixed contact terminals 34 and 35 are provided inside and outside opposite both sides of the free end of the movable contact spring 32.
is provided.

The free ends of the movable contact springs 32 are in contact with the respective inner fixed contact terminals 34 due to the elastic force of the springs themselves. An electromagnetic relay is constructed by attaching the cover 40 to the insulating base 30. Specifically, the coil block 20 is fitted into the fitting groove 31 of the insulating base 30, and the coil spool 2
The card block 10 is fitted from above so that the guide groove 14 of the card 11 is fitted into the guide bin 24 of the card block 1 . The inner width of the guide groove 14 is larger than the outer diameter of the guide bin 24, and the depth of the guide groove 14 is larger than the outer diameter of the guide bin 24.
4, the card slots 10 are supported at the apex of the guide bins 24 in their respective guide grooves 14. In this way, the card block 10 is supported loosely by the guide bin 24 at two points so that it can slide in the direction of the magnetic poles of the permanent magnet 7 and move in parallel. card block 1
Due to the parallel movement of 0, the 13 studs 131 of the movable contact spring drive unit suppress and release the movable contact springs 32 arranged on both sides of the movable contact springs 32, thereby causing the movable contact springs 32 to come into contact with and separate from the fixed contact terminals 34 and 35. Switch the contacts.

[Problem that the invention seeks to solve]

In such a previously proposed electromagnetic relay, as shown in FIG.
Since one movable contact spring 32 having a diameter of 9 is disposed, after the stud 131 of the movable contact spring drive unit 13 presses the movable contact spring 32 and the fixed contact 36 and the movable contact 38 are separated, the fixed contact 37 and Although the transfer contact that the movable contact 39 contacts can be configured, the fixed contact 37 and the movable contact 39
There is a problem in that it is not possible to construct a continuous contact in which the fixed contact 36 and the movable contact separate after they have contacted each other.

In addition, in recent years, there has been a demand for compact electromagnetic relays that are highly sensitive and have a high dielectric strength between contacts, but in order to increase the withstand voltage between opposing contacts, it is necessary to increase the gap between the contacts, which reduces the stiffness of the movable contact spring. In order to increase the contact gap without changing it, as shown in Figure 10, ΔC (contact gap) #d (stud 1 displacement amount) - α, (movable contact spring deflection amount) - α
, (movable contact spring play amount), it is necessary to increase the stud displacement amount d, or to reduce the movable contact spring deflection amount α1 and the play amount false. Here, reducing the movable contact spring deflection α and the play amount false has limitations due to the structure and manufacturing of the electromagnetic relay, so the stud displacement d
It comes down to making it larger. On the other hand, from the relationship between the stud displacement amount d and the magnetic attraction force F (force applied to the stud) shown in Figures 11A and 11B, the excitation is expressed by the area between the rated excitation curve Fa and the de-excitation curve Fb. Assuming that the energy S is constant, as the stud displacement amount d increases (dt>dt), the interval ΔF between the rated excitation curve Fa and the de-excitation curve Fb becomes smaller, and the spring load curve (not shown) falls within the interval ΔF. This makes matching difficult and therefore reduces the sensitivity of the electromagnetic relay. Therefore, there is a problem in that it is difficult to obtain an electromagnetic relay with high sensitivity and high dielectric strength between the contacts.

[Means for solving problems]

The electromagnetic relay of the present invention includes a movable pro-lan in which two U-shaped magnetic pole plates each having two ends are fixed to both magnetic poles of a permanent magnet; two magnetic pole plates of the movable block; an iron core with one end of itself inserted between the ends of one of the two sets of ends formed by; a yoke with its own end disposed outside at least one end of the other set of end parts; a hole through which the iron core is penetrated; a spool having a guide loosely supported at 5 so as to move in parallel to the spool and around which a coil 3 is wound; a plurality of fixed contact terminals disposed near the movable block; and a spool disposed between the plurality of fixed contact terminals. A card comprising: a plurality of movable contact springs; a movable contact spring driving section disposed on both sides and between the plurality of movable contact springs and driving the movable contact springs; and a movable block holding section holding the movable block. It is characterized by having the following features.

〔Example〕

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

Referring to FIGS. 1A and 1B, a first embodiment of the present invention has first ends 5a and 6a and second ends 5a and 6a, respectively.
A movable block □ in which U-shaped magnetic pole plates 5 and 6 having end portions 5b and 6b are fixed to both magnetic poles of a permanent magnet 70.
4, a card 51 that holds the movable block 4,
An iron core 1 having one end 1a disposed between magnetic pole plate ends 5a and 62, and a yoke 2 magnetically connected to this iron core 1 and having ends 2a and 2b disposed facing outside of magnetic pole plate ends 5b and 6b, respectively. , a coil spool 21 that winds the coil 3 and guides the card 51, an insulating base 60 having movable contact springs 62, 63°68.69 driven by the movement of the card 51, and this insulating base 6 (l covered). The cover 40 includes a cover 40.

A movable block 4 composed of a permanent magnet 7 and two U-shaped magnetic pole plates 5 and 6 is held by a card 51 to constitute a card block 50. The card 51 has one guide protrusion 53 on each side and three studs 521 on each side.
, 522, 523. (Details will be described later.) The coil spool 21 has a flange 23 provided with a guide 27, a flange 25 provided with a coil terminal 26 for pulling out the coil 3, and a hole 22 into which the iron core 1 is fitted. are doing. Coilsboo A/21
The coil block 20 is constructed by assembling the yoke 2 from below and driving the iron core 1 inserted through the hole 22 into the fitting hole 2C of the yoke 2. Insulating base 6
0 is a fitting recess 61 into which the coil block 20 is fitted;
Fixed contact terminals 66 arranged on both sides of this fitting recess 61
and 72, fixed contact terminals 67 and 73 arranged on both outsides of fixed contact terminals 66 and 720, and one end of each arranged between fixed contact terminals 66 and 67 and between 72 and 73. The other end is a neutral terminal 64.
Movable contact spring 6z63.6 fixed to 65.70.71
It has a score of 8.69.

A plurality of protrusions 29 at the bottom of the coil spool 21,
Fitting the coil block 20 to the insulating base 60 by fitting it into a hole (not shown) in the fitting recess 61,
The card block 50 is assembled from above so that the guide protrusion 53 of the card 51 engages with the guide groove 28 formed by the guide 27' of the coil spool 21. The magnetic pole plate ends 5a and 68 of the movable block 4 are arranged opposite to both side surfaces of the iron core end 1a, and the magnetic pole plate ends 5b and 6b are arranged to face inside the yoke ends 2a and 2b, respectively. In this way, the card block 50 is loosely supported by the guide 27 so that it can slide and move in parallel in the direction of the magnetic poles of the permanent magnet 7. An electromagnetic relay is constructed by covering the insulating base 60 with the cover 40.

(Fig. 1B) Due to the magnetic flux of the permanent magnet 7, the magnetic pole plate end 5a,
5b, 6aT Card block 50 is generated by attraction and repulsion between the magnetic poles generated in 6b and the magnetic poles excited at the core end 1a and yoke ends 2a and 2b by energization of the winding 3.
moves parallel to the magnetic pole direction of the permanent magnet 7, and the movable contact spring drive unit 52 switches the contact.

An example of the card will be described with reference to FIGS. 2A and 2B. As shown in these figures, the card 51 has inner studs 521, middle studs 522, . It has an outer stud 523. Movable contact springs 62 and 68 are arranged between the inner stud 521 and the middle stud 522, and movable contact springs 63 and 69 are arranged between the middle stud 522 and the outer stud 523.

Next, referring to FIGS. 3A to 5C, the first contact switching mechanism
A configuration example will be explained.

FIGS. 3A to 3C show a transfer contact structure according to a first embodiment. The movable contact spring 68 has one end fixed to the neutral terminal 70 and the other end fixed to the fixed contact 7 of the fixed contact terminal 72.
It has a movable contact 681 facing 21. The movable contact spring 69 has one end fixed to the neutral terminal 71 and the other end fixed to the movable contact 6 facing the fixed contact 731 of the fixed contact terminal 73.
It has 91. The neutral terminals 70 and 71 are integrated inside the insulating base 60 and are drawn out as one terminal. The movable contact spring 68 is pressed against the fixed contact terminal 72 by preliminary pressure. The movable contact spring 69 has no prestress. The inner stud 521 of the card 51 presses the movable contact spring 68 and the movable contact 681
The fixed contact 721 is released, and the inner stud 522 presses the movable contact spring 69 to close the movable contact 691 and the fixed contact 7.
When the card 51 moves in the direction of the arrow from the state in which the contacts 31 are in contact (FIG. 3A), the middle stud 522 moves into contact with the movable contact 6.
Instead of releasing the compression of the movable contact spring 69, the outer stud 523 presses the movable contact spring 69, and the movable contact 691 and the fixed contact 731 are separated (FIG. 3B), and then the inner stud 521 releases the compression of the movable contact spring 68. The movable contact spring 68 is pressed against the fixed contact terminal 72 side due to preliminary pressure, and the movable contact spring 68
81 and fixed contact 721 come into contact (FIG. 3C). As described above, a transfer contact is configured in which the movable contact 681 closes after the movable contact 691 opens.

As is clear from FIG. 6, the contact gap Δ in the same embodiment
C is the stud displacement amount d, the movable contact spring play amount α8.
From the movable contact spring spring amount α3, Δc#d−a, +α
1, and compared to the conventional contact opening/closing mechanism shown in FIG. 10, even if the stud displacement amount d is the same, the movable contact spring deflection amount α
The contact gap can be increased by the amount of springing α of the movable contact spring, and therefore an electromagnetic relay with a higher withstand voltage between the contacts than the conventional one can be realized without lowering the sensitivity.

FIG. 7 shows the relationship between stud displacement, magnetic attraction force, and spring load force in this electromagnetic relay. The horizontal axis shows the stud displacement amount d, and the vertical axis shows the force F applied to the stud. The broken line Fa shows the rated excitation curve, the solid line Fb shows the de-excitation curve, and the solid line Pc shows the spring load force. Further, the constant chain line Pd is an exciting excitation curve representing the minimum magnetic attraction force required to move the stud and switch the contacts.

FIGS. 4A to 4C show a continuous contact configuration, which is a second configuration example. What differs from the first embodiment shown in FIGS. 3A to 3C is that both the contact springs 68 and 69 are pre-stressed, and the inner stud 521 and outer stud 52
This is the point where the distance from 3 is widened. The inner stud 521 presses the movable contact spring 68 to separate the movable contact 681 and the fixed contact 72.
1 is separated and the inner stud 522 presses the movable contact spring 69 so that the movable contact 691 and the fixed contact 731 are in contact (FIG. 4A). When the card 51 moves in parallel in the direction of the arrow, the inner stud 521 and the middle The studs 522 release the pressure on the movable contact springs 68 and 69, respectively, and due to the pre-pressure applied to each, the movable contact 681 and the fixed contact 721 come into contact with each other, and the movable contact 691 and the fixed contact 7
31 (FIG. 4B) and then outer stud 52.
3 presses the movable contact spring 69, and the movable contact 691 and the fixed contact 731 are separated (FIG. 4C). As described above, a continuous contact is constructed in which the movable contact 691 opens after the 51C movable contact 681 closes.

Other examples of continuous contact configurations are shown in FIGS. 5A to 5C. This embodiment differs from the second embodiment shown in FIGS. 5A to 5C in that the inner stud 522 also presses the movable contact spring 68.

Note that the above description also applies to the movable contact springs 62 and 63. The prepressure applied to the movable contact springs 62, 63, 68, 69 can be adjusted by individually twisting the neutral terminals 64, 65, 70, 71, each of which is independently fixed.

Further, in the first embodiment, the yoke 2 of the coil block 20 has bifurcated end portions 2a and 2b, and the card block 50 whose contacts are switched by energization of the coil 3 is activated by the magnetic flux of the permanent magnet 7. A self-maintaining electromagnetic relay that self-maintains its switching state has been shown, but one yoke end, for example, end 2b, is removed to break the balance of the magnetic circuit.
It may be an electromagnetic relay that maintains a current by attracting the card block 50 toward the yoke end 2a side when the current is not energized and maintaining the switching state by energizing the coil 3.

〔Effect of the invention〕

As explained above, according to the present invention, two movable contact springs are disposed between fixed contacts, and three studs are disposed on both sides of the movable contact springs and between the movable contact springs, and a differential magnetic circuit is formed. By using a card block that moves in parallel to drive switching, a continuous contact configuration is easily possible, and an electromagnetic relay with high sensitivity and high withstand voltage between contacts can be obtained.

[Brief explanation of drawings]

1A and 13 are an exploded perspective view and a partially sectional perspective view showing one embodiment of the present invention, a second person's view and a partially cutaway perspective view, respectively, a second person's view and a top view of an example of the card, and a third
4 and 5 respectively show the first contact switching mechanism.
．． FIG. 6 is a plan view showing the characteristics of the contact switching mechanism; FIG. 7 is a characteristic diagram of stud displacement, magnetic attraction force, and spring load force; FIG. 8 is a partial sectional plan view showing the second and third examples; Fig. 9 is a perspective view showing a conventional electromagnetic relay, Fig. 9 is a plan view showing a conventional contact switching mechanism, Fig. 10 is a plan view showing the characteristics of the conventional contact switching mechanism, and Fig. 9 is a conventional a stud displacement. It is a characteristic diagram with magnetic attraction force. 1...Iron core, 1a...Iron core end, 2...
... Yoke, 2a, 2b ... Yoke end, 2G ... Fitting hole, 3 ... Coil,
4...Movable block, 5.6...Magnetic pole plate, 5a, 5b, 6a, 6b...Magnetic pole plate end, 7...Permanent magnet, 20... Coil block, 21... Coils bourg, 22.
...hole, 23, 25... collar, 26...
...Coil terminal, 27...Guide, 28.
...Guide groove section, 50 ... Card block, 51 ... Card, 52 ... Movable contact spring drive section, 53 ... Guide protrusion, 521・
...Inner stud, 522, old...Medium stud, 5
23... Outer stud, 60... Insulating base, 61... Fitting recess, 62, 63, 68, 6
9...Movable contact spring, 64.65.70.71...
...neutral terminal, 66, 67, 72.73...
Fixed contact terminal, 681.691...Movable contact,
721, 731...Fixed contacts. 7・-) 1. Foil fA diagram 2A diagram Zs Xi'7 wo f field Y point. , 6°z/s doto'N57th episode I Figure 11A Figure 1fB Procedural amendment (method) 60.5.23 Showa year, month, day 1, case description 1985 patent application No. 8614 2, invention Name: Electromagnetic Relay 3. Relationship with the person making the amendment: Applicant: 5-33-1-4 Shiba, Minato-ku, Tokyo, Agent 6: ``Brief explanation of the drawings'' of the specification to be amended. column. 7 Contents of amendment

Claims (1)

[Scope of Claims] A movable block formed by two U-shaped magnetic pole plates each having two ends, one fixed to both poles of a permanent magnet; formed by the two magnetic pole plates of the movable block; an iron core with one end of itself inserted between the ends of one of the two sets of end parts; a yoke with its own end disposed outside at least one end of the other set of end parts; a hole through which the iron core is penetrated; and a movable block arranged in a direction in which the permanent magnet is magnetized. a coil spool having a guide loosely supported so as to move in parallel; a coil spool around which a coil is wound; a plurality of fixed contact terminals disposed near the movable block; and a coil spool disposed between the plurality of fixed contact terminals. a plurality of movable contact springs; a movable contact spring driving section that is disposed on both sides and between the plurality of movable contact springs and drives the movable contact springs; and a movable block holding section that holds the movable block. An electromagnetic relay characterized by comprising: and;