JP3147427B2 - Electromagnetic relay - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil structure of an electromagnetic relay, and more particularly to miniaturization and low power consumption of the electromagnetic relay while securing a necessary minimum distance between a conductive member located around the coil and the surface of the coil. The present invention relates to an electromagnetic relay with the aim.

In recent years, in the field of electromagnetic relays (hereinafter referred to as "relays"), with the demand for miniaturization and low power consumption of the relays, it is desired that the driving coil be as large as possible, in other words, have a large number of turns. It is becoming
The distance between the surface of the coil and a conductive member such as a coil terminal or a conductive spring material disposed around the coil is specified by UL standard, JIS standard or the like from the viewpoint of insulation characteristics.

On the other hand, a conventional coil is configured to have a uniform cross section along the longitudinal direction because a coil wound around an iron core serving as a core and a bobbin body forms a magnetic circuit. As a result, the outer shape of the coil wound by the bobbin is also formed in a columnar shape having a uniform cross section along the longitudinal direction.

However, the above-described plurality of conductive members located around the coil are not necessarily arranged at a fixed distance from the coil surface from a functional surface as a relay. In such a case, Since the conductive member located closest to the coil surface must be used as a reference, miniaturization as a relay may be regulated or the number of coil turns sufficient to cover the characteristics of the relay may be suppressed, so a solution is desired. ing.

[0005]

2. Description of the Related Art FIG. 3 is a principle diagram for explaining a conventional electromagnetic relay, and FIG. 4 is a diagram for explaining a problem.

FIG. 1 shows an example of a relay having two circuits and two windings. In FIG. 3, the relay 1 includes an electromagnet 2, a contact spring set 3 that operates by an attractive force generated in the electromagnet 2 when the electromagnet 2 is energized, and the electromagnet 2 and the contact spring set 3.
And a base substrate 4 for fixing the same.

The internal electromagnet 2 includes a coil 22 wound in two layers around a bobbin 21 having flanges formed at both ends in the longitudinal direction, and an outside (not shown) of the coil 22.
A yoke 23 which is formed so as to be branched into two yoke pieces 23a and 23b facing each other along the longitudinal direction and the other end of which is bent at a right angle in the thickness direction; The coil is engaged with the right-angled surface of the yoke 23 and
The armature 24 (free end which reciprocates in the figure) mounted on the yoke 23 so as to be able to reciprocate between the opposed yoke pieces 23a and 23b on the central axis of the bobbin 21 on the central axis of the bobbin 21. Only described).

A total of four external connection terminals 22a and 22b (only two are shown on one side in FIG. 1) for applying a current to each of the two layers of the coil 22 are provided on a base for fixing the electromagnet 2. It is disposed through the substrate 4.

For example, when a required current is externally applied to two external connection terminals 22a connected to a coil layer on one side of the coil 22 composed of two layers, the tip of the armature 24 is attracted to the yoke piece 23a on one side. The yoke piece 23a
When the required current is applied to the two external connection terminals 22b connected to the other coil layer and the other end of the armature 24 is attracted to the other yoke piece 23b,
When no current is applied to the external connection terminals 22a and 22b, the tip of the armature 24 is located at the center of the yoke pieces 23a and 23b as shown in the figure.

One contact spring set 3 is provided with two tongue-shaped movable contact springs 31a, 31 fixed at one end so as to face both sides of the base substrate 4 at the position where the electromagnet 2 is fixed.
b and fixed contact plates 32a, 33a, 32b, 33b, which are disposed facing both sides near the free end of each movable contact spring, and a card which is fixed at right angles to the armature 24 and moves together.
The movable contact springs 31a, 31b are inserted into grooves 34a, 34b formed at positions corresponding to the movable contact springs 31a, 31b in the longitudinal direction of the card 34. I have.

Therefore, when the armature 24 reciprocates between the yoke pieces 23a and 23b, the movable contact springs 31a and 31b are bent by the card 34 which reciprocates together with the armature 24. When the portion contacts one yoke piece 23a, the movable contact spring 31a contacts the fixed contact plate 32a, and the movable contact spring 31b contacts the fixed contact plate 32b, and the tip of the armature 24 contacts the other yoke piece 23b. Then, the movable contact spring 31a comes into contact with the fixed contact plate 33a, and the movable contact spring 31b comes into contact with the fixed contact plate 33b.

Each of the movable contact springs and the fixed contact plate has its own external connection terminal penetrating the base substrate 4. Therefore, it is possible to obtain the relay 1 capable of realizing switching between two circuits depending on whether or not a current is applied to the coil 22.

[0013]

SUMMARY OF THE INVENTION Movable contact spring during operation
In FIG. 4 showing the bent state of the coils 31a and 31b, when no current is applied to the coil 22, the movable contact springs 31a and 31b are in a free straight a state. external connection when applying a predetermined current to the terminal 22a respective movable contact spring indicates such deflection line of one-dot chain line a _1, also an external connection terminal 22b respective movable contact spring by applying a predetermined current to the broken line a ₂ It becomes a bending line as shown in FIG.

This indicates that when the relay is operated, that is, when a current is applied to the coil 22, one of the movable contact springs 31a and 31b approaches the coil side in any case.

On the other hand, the shortest distance w between the coil surface and the conductive member, that is, in the case of the drawing, the movable contact spring is specified by the UL standard, the JIS standard or the like from the viewpoint of insulation characteristics as described above.

Accordingly, since the outer diameter d of the coil 22 is set in consideration of the displacement position of each movable contact spring when the relay is operated, a coil sufficient to cover the characteristics as the relay is provided. In order to secure the number of turns, the position of each movable contact spring must be separated from the coil 22. In this case, a pair of fixed contact plates 32a and 33a (or 32b and 33b)
As a result, a wasteful space shown by a dot area A is generated between the fixed position of the movable contact spring 31a (or 31b) located almost in the middle and the surface of the coil 22, and as a result, the size of the relay is increased. I have to do it.

Conversely, when the size of the relay is restricted, the number of turns of the coil 22 must be reduced in order to secure the above-mentioned interval w. Becomes

[0018]

Means for Solving the Problems The above-mentioned object is attained on a coil side surface.
The movable contact spring fixed at one end to the proximity position of
Are arranged along the line, and the movable
An electromagnetic relay configured so that the other end of the contact spring is displaced toward the coil, wherein the surface of the coil is
While maintaining a predetermined distance from the movable contact spring when applying current,
This is achieved by an electromagnetic relay formed with a change in outer diameter so as to be parallel .

[0019]

When the number of turns of the coil is changed for each location along the longitudinal direction, the outer diameter of the coil can be changed for each location.

Accordingly, in the present invention, the coil near the side of the coil is provided.
Position and current of the movable contact spring arranged in the area along the
Part turns the displacement of the movable contact spring when applied in advance considering
Min to and has so as to form said coil while gradually changing, this is movable when the coil is the surface current applicator
Since the distance w between the moving contact springs can be set in a substantially constant parallel state , it means that a coil that is space-efficient can be formed.

Therefore, it is possible to easily configure a relay capable of responding to a demand for downsizing or a demand for low power consumption without reducing the number of turns of the entire coil.

[0022]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view for explaining an electromagnetic relay according to the present invention. FIG. FIG.

FIG. 2 is a diagram for explaining another embodiment. Note that, in the drawings, the case of the same relay as in FIG. 3 is used as an example, so that the description will be made with reference to the plan view shown in FIG. 4 and the same members as those in FIG. ing.

In FIG. 1 (1-1) shown in a plan view, the relay 5
It is composed of an electromagnet 6, a contact spring set 3 and a base substrate 4 described with reference to FIG. The inner electromagnet 6 includes a coil 62 wound in two layers around a bobbin 61 similar to the bobbin 21 described with reference to FIG.
The yoke 23 is mounted in the same manner as in FIG. 3, and the yoke 23 is engaged with the yoke 23, and the yoke 23 facing the yoke 23 on the center axis of the coil 62, that is, the center axis of the bobbin 61 is moved. An armature 24 that can reciprocate.

The external connection terminals described with reference to FIG. 3 for applying a current to each of the two layers of the coils 62 penetrate the base substrate 4 to which the electromagnet 6 is fixed, and protrude toward the back side of the drawing. When the required current is applied to the two external connection terminals connected to the coil layer on one side of the coil 62, the tip of the armature 24 is connected to the yoke piece 23a on one side. When a required current is applied to the two external connection terminals connected to the other coil layer, the tip of the armature 24 is attracted to the other yoke piece 23b, and no current is applied to the external connection terminals. Sometimes, the tip of the armature 24 is located in the middle of the yoke pieces 23a and 23b, as in the case of FIG.

In this case, the coil 62 is (1-
2) Using a bobbin 6a in which the flange on one side is formed larger than the other as shown in 2), winding the coil of the first layer indicated by ● with a predetermined number of turns, and then the second layer indicated by ○ As shown in the figure, a part of the eye coil is wound so that the winding end position of each layer is slightly shifted, and only a plurality of layers on the surface are wound over the entire surface to prevent the coil from fraying. 3 can be formed into a shape having a region in which the outer diameter gradually changes in the middle portion in the vertical direction.
Gradient B leading to the widest part of the finest portion of the 62 so as to substantially parallel to a ₁ line shown movable contact spring 31a, in the deflection curve i.e. 4 to the coil side of 31b indicated by (1-1) ing.

Accordingly, the minimum necessary distance w between the movable contact springs 31a and 31b and the surface of the coil 62 when the coil 62 is bent is secured over the entire length of the coil. The control of the number of turns can be easily realized by inputting a required information signal to a number-of-turns control section of a generally used automatic winding machine.

On the other hand, the contact spring set 3 has been described with reference to FIG. Therefore, it is possible to obtain the relay 5 that can switch between two circuits depending on whether or not the current is applied to the coil 62.

In the electromagnet 6 having such a coil 62, (1-1)
In other words, the number of turns in a portion corresponding to the dot region A in FIG. 4 can be increased, so that the relay 5 including the electromagnet 6 secures a necessary minimum distance w between the coil and the conductive member around the coil. The relay 1 described in FIG.
Thus, lower power consumption can be realized.

In FIG. 2 similar to FIG. 1, (2-1) is a diagram showing a configuration of a relay, and (2-2) is a diagram showing a method of forming a coil used in the relay. Referring to (2-1) of the drawing, the relay 7 includes an electromagnet 8, a contact spring set 3 which operates by engaging with the electromagnet 8, and the base substrate 4.

In particular, the electromagnet 8 in this case is composed of a bobbin 81 and a coil 82, a yoke 23, and an armature 24 wound around the bobbin 81 in two layers, and an external connection terminal (not shown) connected to the coil 82. The armature 24 reciprocates between the yoke pieces 23a and 23b of the yoke 23 by applying a required current to the yoke 23 as in FIG.

In this case, the coil 82 uses a bobbin 81 similar to that shown in FIG. 1 as shown in (2-2), and the first layer coil represented by a black circle as shown in FIG. After that, wind the coil of the second layer indicated by ○ so that the winding end position for each layer is slightly shifted, and further wind only a plurality of layers on the surface to prevent the coil from fraying. Can be formed in the shape of a truncated cone as shown in the figure, but from the finest detail thinner than in the case of FIG. 3 located at the left end of the coil 82 to the thickest portion thicker than the case of FIG. 3 located at the right end. The slope D is shown in FIG.
It is adapted to substantially parallel to a _1-wire as well.

This means that the movable contact springs 31a and 31b are aligned with the outer inclined line D of the coil 82 in a state where the minimum required distance w between the surface of the coil 82 and the movable contact springs 31a and 31b is secured. This means that the distance p between the two movable contact springs 31a and 31b can be made smaller than in FIGS. 3 and 1.

In this case, the control of the number of turns can be easily realized as in FIG. On the other hand, the contact spring set 3 has been described with reference to FIG. Therefore, a relay 7 capable of switching between two circuits depending on whether or not a current is applied to the coil 82 is shown in FIG.
Can be obtained as well.

In the electromagnet 7 having such a coil 82, (2-
Because it can ensure the number of turns of the coil 82 by moving the turns of the portion corresponding to the hatched area E ₁ of 1) the hatched area E _2, and secure the necessary minimum distance w between the conductive member around the coil However, it is possible to realize a smaller size than the relay 1 described with reference to FIG.

[0036]

As described above, according to the present invention, there is provided an electromagnetic relay which is reduced in size and power consumption as an electromagnetic relay while securing a necessary minimum distance between a conductive member located around the coil and the surface of the coil. can do.

In the description of the present invention, the case where each coil is formed in a cylindrical shape is taken as an example. However, it is clear that the same effect can be obtained even with a rectangular cylindrical coil.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an electromagnetic relay according to the present invention.

FIG. 2 is a diagram illustrating another embodiment.

FIG. 3 is a principle diagram illustrating a conventional electromagnetic relay.

FIG. 4 illustrates a problem.

[Explanation of symbols]

 3 Contact spring set 4 Base board 5,7 Electromagnetic relay 6,8 Electromagnet 23 Yoke 23a, 23b Yoke piece 24 Armature 31a, 31b Movable contact spring 61,81 Bobbin 62,82 Coil

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model 2-56334 (JP, U) Japanese Utility Model 3-77349 (JP, U) Japanese Utility Model 4-102141 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) H01H 50/44

Claims (1)

(57) [Claims] An end is fixed at one end to a position close to a side surface of a coil.
A movable contact spring is disposed along the coil, and
When current is applied to the coil, the other end of the movable contact spring
An electromagnetic relay configured to be displaced to the movable contact bar when the current is applied.
An electromagnetic relay characterized in that it is formed with a change in outer diameter so as to be substantially parallel to a predetermined distance from the outer diameter.