JPS6243295B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrical/mechanical switch, and more particularly to a relay operated by direct current, which is equipped with a fixed yoke having three branches and a coil wound around the central branch. It includes a hollow housing and a contact block having fixed and movable contacts and an electromagnetic actuator, to which the contact block is attached a support surface for the actuator and a support surface in contact with the support surface of the housing. This is related to relays such as the one shown below.

Structures which have the advantages associated with ease of assembly when using electromagnets operated with alternating current must also be applied when using electromagnets operated with direct current, and the current reduction circuits should also be applied when using electromagnets operated with direct current. If not necessary, accurate strokes would require very different magnetic circuit configurations in terms of turn size and air gap construction.

In addition, if a device with auxiliary removable contacts is required, which requires a greater actuation force from the magnet, the fixed and movable parts of the magnetic circuit should always be kept in a stationary position as much as possible, even in mass production. Since it must be made in a normal manner and the ampere-turn value must be large, the influence of heat on the winding must be tolerable.

Therefore, an object of the present invention is to provide an electrical/mechanical switch that operates on direct current, has a structure that is easy to mass produce, can easily be used with additional auxiliary contacts, and has a low winding operating voltage. It is an object of the present invention to provide a relay that can be operated even when the coil is turned on, without the need for a large magnetic circuit structure, and without the need for amperage turns that cause overheating of the coil.

The relay according to the present invention has a structure in which at least the magnetic pole face of the central branch of the core and the region of the actuator that engages with the magnetic pole face are inclined in a V-shape symmetrically with respect to the axis of the central branch, and each of the both side branches is In the vicinity of the pole face, it has an outwardly facing side end for engaging a receptacle provided in the housing near the support surface, and at the bottom of the housing there are three grooves for pressing the side end against the receptacle. It is characterized in that an elastic member is provided which acts on a joint common to the two branches.

Hereinafter, the present invention will be explained using the drawings.

FIG. 1 is a diagram including a partial cross section showing an embodiment of the present invention, and shows the upper and lower limit positions of the movement range of the actuator, respectively, to the left and right with respect to the center. FIG. 2 shows details of how the fixed core in FIG. 1 is attached.

The relay body consists of a hollow housing 1 closed by a contact block 2 as a cover.

An E-shaped fixed metal yoke is disposed inside the housing 1, and the yoke includes a central branch, that is, a central member 7, a connecting member 8, and both side branches that are connected by the connecting member and extend parallel to each other. elongated members 5 and 6.
This core is carried at three locations within the housing. That is, the elastic member 10 acts on the surface 27 of the connecting member to push the core upward in the figure.
and 2 as shown at 26, 26' in FIG.
It is supported by separate flanges. These flanges form the side walls 19,1 of the housing.
They are respectively engaged with receiving portions 25, 25' provided on 9'.

The elastic member can be formed of the bottom part 9 of the housing from an elastic material, and each of the receiving parts can be formed of a second
The openings 20, 20' formed in the side walls 19, 19' may be formed at the upper ends thereof as shown in the figure.
The sidewalls have sufficient resiliency to permit lateral deflection upon insertion of the core into the housing.

The core will be carried by the surface of a single-piece housing formed from a mold.

Openings 20, 20' in the direction perpendicular to the plane of the figure
The core is supported more firmly by the side 29 which is integral with the other end and the bottom 9 of the housing.

A coil 4 wound around the central member is for excitation of the electromagnet. The inner surface of the central opening of the coil has a groove 28 surrounding the central member and running parallel to the central axis of the coil, with which groove 28 is engaged a transverse pin 33 provided in the core to secure these parts. The position between them is adjusted.

The upper part of the housing 1 is provided with a flat surface 11 that serves as the upper limit of the opening.

This mounting plane 11 engages with the supporting surface 31 of the contact block 2, and is fixed to the housing by means not shown.

The contact block contains all of the moving parts of the device. That is, the E-shaped movable actuator 12, the contact mounting part 16 on which the movable contact 17 that engages with the fixed contact 18 is attached, and the actuator's position relative to the fixed position of the housing, that is, on the surface 15 of the contact block 2. It includes a return spring 13 that is pressed so that the upper surface 14 comes into contact with it. As shown in FIG. 4, the central member 32 of the actuator has a transverse pin 30, the ends of which engage the grooves 28 described above.

In the normal state shown in the left half of FIG. 1, the actuator is pressed against a surface 15 serving as a reference surface.

When a sufficient amount of direct current flows through the coil,
The actuator makes a movement with an amplitude L such that its two pole faces 22, 22' come into contact with the core pole faces 21, 21' on both side elongated members of the magnetic circuit section.

In this position, the magnetic circuit becomes a closed loop and a residual air gap e is created between the pole faces 23, 24 of each central member 7, 32 of the core and actuator, as shown in FIGS. 2 and 1.

As is clear from FIG. 1, each of the pole faces 21, 22, 23, 24 of the side elongated members and the central member are inclined with respect to the central axis XX' of the coil. This is to further reduce the residual air gap and to increase the magnetic pole area for a given actuator movement amplitude L. In order to prevent or reduce the effects of various phenomena, it is provided that even if the surfaces 21, 22 are brought into contact, a residual air gap e still exists.

The pole faces 23, 24 of the central member 7 are V-shaped and symmetrical with respect to the axis XX' of the coil, and the angle that these faces make with respect to the axis is formed by the surfaces 21, 22 of the opposite extensions. is generally smaller than the angle between the central members 7, 32, so that the suction force between the central members 7, 32 is greater than the suction forces that appear between the other members.

The axial movement of the actuator is therefore more stable, but the lateral suction forces at the central member 32 are unbalanced. This unbalance is limited by the symmetrical selection of the angle of inclination of the pole faces, and also by the presence of pins 30 that ensure the movement of the central part of the mover with respect to the fixed central part. That will happen. Furthermore, the magnetic pole face 21 of each elongated member,
The vertical line N at the center of 21' is the guide pin 30.
It is also limited by the fact that it passes through the part of the central member where is located. That is, since the moment around the guide pin 30 becomes close to 0, the influence of the suction force that attempts to rotate the actuator is reduced.

The surfaces 2 of the elongated members 5 and 6 of the yoke are adjusted so that the receiving portions 25 and 25' are not too far apart from the support surface 11.
1 and 21' are formed toward the outside.

With such a structure, the pole face of the central member is located at the center of the distance between the connecting members when the core and actuator come into contact with each other.

Therefore, the stability of the system is increased and all the above structures significantly increase the initial suction force.

However, when the distance between the yoke and the actuator exceeds a certain extreme value, the actuator is no longer effectively attracted. This distance must therefore be determined with acceptable accuracy within manufacturing tolerances.

In the device described above, the distance d ₁ is between surfaces 11 and 31
The distance d2 is the distance between the common surface and the surface 15 that the actuator contacts, and the distance _d2 is the distance between the common surface and the flange 26, 2.
6′ and the surface including the receiving portion surfaces 25, 25′ that are in contact with it, and the distance d ₃ is the distance between the receiving portion surface and the bottom surface 2 of the fixed core which is subjected to the spring action of the elastic member 10.
It shows the distance from 7.

Since the parts 1 and 2 are made of plastic material formed by a mold, a change in the length of these parts will greatly change the distance L. The influence of such variations due to manufacturing tolerances will disappear if the sum of distances d ₁ and d ₂ is as small as possible.

Since extending the elongated members of the fixed core to the level of surface 15 would counteract the lateral magnetic effects and at the same time significantly increase the lateral size of the device,
In the device according to the invention, the surfaces 25, 25' and the flanges 26, 26' are arranged as close as possible to a common plane passing through the surface 11.

In this way, as shown in Figure 1, three
points, that is, the receiving parts 25, 25' and the elastic member 1
Since the fixed yoke is supported at 0, assembly is simple, effective fixing is possible, and accurate positioning of the fixed yoke is possible.

In the embodiment in which the relay is assembled using the structure shown in FIG. 3, the fixed yoke and the actuator are assembled using magnetic circuits 40, 41 and 46, 47 which are divided into halves, and members of the same shape are assembled. The symmetry of the magnetic attraction force can be improved by arranging and using them so as to have line symmetry. The magnetic circuit divided in half is symmetrical with respect to a plane passing through the axis XX' and perpendicular to the drawing, and the air gap 5
1,50, which are connected by transverse plates.

In the structure shown in FIG. 3, if the magnetic part is asymmetric or there is a lateral external force as indicated by arrow P, for example when the relay is used lying on its side, the two poles of the extension member and the center When the surfaces such as 43, 45 and 42, 44 belonging to the two poles of the member are attracted to each other, the distance between one of the magnetic pole faces 42, 44 in the center becomes smaller than the distance between the other magnetic pole faces. Therefore, the air gaps 50, 51 in the magnetic path indicated by R create a considerable magnetic reluctance, which limits the attractive force generated between these surfaces, and thus reduces the total resistance between the actuator and the core. The lateral component of the suction force can also be limited.

[Brief explanation of the drawing]

FIG. 1 is a partially cross-sectional view showing an embodiment of the present invention, and shows the upper and lower limit positions of the actuator in left and right halves, respectively. FIG. 2 is a partially detailed view of FIG. 1. , FIG. 3 is a diagram showing an example of a magnetic circuit, and FIG. 4 is a cross-sectional view of the coil taken near the guide pin of the actuator 12 shown in FIG. 1 in a direction perpendicular to the axis XX'. Explanation of symbols of main parts, 1...Housing, 2
... Contact block, 4 ... Coil, 5, 6
...Extension member, 7, 32...Central member, 8, 12
...Connection member.

Claims (1)

[Scope of Claims] 1. An approximately E-shaped fixed yoke comprising a central portion, extension portions provided on both sides of the central portion, and connecting portions connecting these portions, and an electromagnet comprising a coil wound around the central portion; a hollow housing housing the electromagnet; and a generally E-shaped housing disposed within the hollow housing having movable contacts and arranged to form a magnetic circuit with the central portion and extension portion of the fixed yoke.
A relay comprising a letter-shaped actuator and a contact block having a fixed contact, wherein the fixed yoke and the magnetic pole surfaces of the actuator are inclined symmetrically with respect to the axis of the coil, which is the linear movement direction of the actuator. A groove 28 extending in the directions of the axes X and X' of the coil provided in the inner wall of the center opening of the coil 4, and a groove 28 protruding from the side of the central part 32 of the actuator and slidable with the groove 28. The guide means includes a guide pin 30 provided to engage with each magnetic pole face 2 of the both side extensions of the actuator.
A relay characterized in that a perpendicular line N at the center of the actuator 2 and 22' is disposed so as to pass through the guide pin or its vicinity in the center portion 32 of the actuator. 2 magnetic pole surface 24 of the central portion 32 of the actuator;
24' and the magnetic pole face 2 of the central part 7 of the fixed yoke.
3 and 23' are symmetrically inclined in a V-shape with respect to the central axes X and X', and the acute angles formed by the magnetic pole faces 24, 24', 23, and 23' are as follows.
Each magnetic pole surface 22, 22', 21, 2 of the both side extensions 5, 6 of the actuator and fixed yoke that engage with each other.
2. The relay according to claim 1, wherein the angle is smaller than the acute angle 1'. 3. Each of the extensions 5, 6 of the fixed yoke is provided on an elastic side wall 19, 19' close to the surface 11 of the housing in contact with the contact block 2 in the vicinity of its magnetic pole face 21, 21'. Relay according to claim 1 or 2, characterized in that it has an outwardly facing flange 26, 26' which engages with a receptacle 25, 25' of the opening 20, 20'. .