JPS5854765Y2 - electromagnetic relay - Google Patents

Description

[Detailed description of the invention] This invention relates to an electromagnetic relay, more specifically an electromagnetic relay whose contacts are opened and closed by the rotation of an armature, and its main purpose is to create a large contact gap with a small stroke. There are electromagnetic relays that can be used.

Generally, in order to obtain a large contact gap in an electromagnetic relay, it is sufficient to increase the stroke, but since increasing the stroke reduces the attraction force of the electromagnet, it is desirable to obtain a large contact gap with a small stroke. .

In the case of an electromagnet with a rotating armature, the point of engagement between the contact drive part of the armature and the contact spring is brought close to the fixed end of the contact spring to drive the contact spring to obtain a large contact gap with a small stroke. Also, since the contact drive unit itself approaches the rotation center of the armature, the stroke for moving the contact spring becomes smaller, and in the end it is not possible to obtain a large contact gap.

The present invention has been devised in view of the above points, and will be described in detail below based on the embodiments shown in the drawings.

The armature 1 has a pair of magnetic plates 3, 3 arranged parallel to each other in a synthetic resin block 2 molded into an elongated shape and arranged in parallel with each other in the longitudinal direction of the block 2.
, 3 are sandwiched between two permanent magnets 4, 4 magnetized in a direction perpendicular to the magnetic plates, and the ends of both magnetic plates 3° and 3 are located at both longitudinal ends. stands out.

The yoke 10 is formed of a magnetic material into a figure 73 shape, and has a central piece 1.
A coil frame 13 is fitted onto the base 1 and a coil (not shown) is wound around the coil frame 13.
4 is fixed on top.

A separator 15 that covers the coil is attached above the coil frame 13, and a shaft 16 protruding from the center of the upper surface of the separator 15 is inserted into a shaft hole 5 provided at the center of the armature 1, so that the armature 1 can be freely rotated in a horizontal plane. while holding the yoke 1
Both leg pieces 12 of the armature 1 are made to protrude between the two magnetic plates 3, 3 at both ends of the armature 1 in the longitudinal direction, and the armature 1 is rotated in one direction by excitation of the coil.

In the figure, reference numeral 20 denotes a contact spring having a length approximately equal to the long side of the armature 1, and is arranged along the longitudinal direction of the armature 1 with one end fixed to a terminal piece 21 inserted and fixed into the base 14. A movable contact 22 is provided on the free end of the contact spring 20 on the side opposite to the armature 1, and a fixed contact 22 is provided on a fixed terminal piece 23 inserted and fixed to one end of the base 14.
It is facing 4.

A contact drive unit 6 protrudes from one longitudinal end of the armature 1, that is, one longitudinal end of the block 2, in the width direction of the armature 1, facing the free end of the contact spring 20. A contact spring 20 with a fixed end slightly closer to the movable contact 22 is housed in the groove 7, and by holding the contact spring 20 with the contact drive unit 6, the rotation of the armature 1 drives the contact spring 20 to open and close the contact. It is supposed to be done.

Here, a protrusion 8 protrudes from approximately the longitudinal center of the block 2 of the armature 1 in the same direction as the contact drive section 6, and as the armature 1 rotates, the contact spring 20 is drawn toward the armature 1, and the contact 22, When opening 23, this protrusion 8
is pressed to approximately the center of the contact spring 20, and the tip of the fulcrum spring 20 is largely bent using this point as a fulcrum, thereby increasing the contact gap S between the movable contact 22 and the fixed contact 24.

That is, as shown in FIG. 3, when the protrusion 8 is not present, the contact spring 20 receives the force F from the contact drive unit 6 that acts on the point If there is a protrusion 8, the contact spring 2 will bend as shown.
The fulcrum of 0 moves to the protrusion 8, and as a result, a large contact gap S can be obtained with the same stroke of the contact drive unit 6.

In addition, by shifting the fulcrum of the contact spring 20 from the fixed end to the side of the movable contact 22 in this way, a small spring return force is not generated toward the fixed contact 24 when the protrusion 8 is not present. Even if the contact spring 20 is driven toward the armature 1 with a stroke, the armature 1 is deformed using the protrusion 8 as a fulcrum against the alligator spring force, and the contact spring 20 is moved with a small stroke. Even if the contact spring 20 is pulled toward the armature 1 to open the contacts 22, 24, the return force of the spring toward the fixed contact 24 is accumulated in the contact spring 20, and when the contact spring 20 closes the contact 22, 24, the contact spring 2
The spring return force to the side of the armature 1 that occurs when the armature 0 is bent in the opposite direction is balanced, and the spring load mn in both directions is well matched as shown in the operating characteristic diagram in Figure 4, resulting in high sensitivity. The following characteristics can be obtained.

In the figure, the horizontal axis is the amateur stroke, the vertical axis is the force, and A and B are the amateur attraction forces in the contact closing direction and the contact opening direction, respectively, that is, the composite attraction force due to the permanent magnet and the exciting current, m , n are the above-mentioned attraction forces A and B, respectively.
It is a spring load that acts in the opposite direction to the suction force.

As is clear from the figure, the spring load m acts in a direction that cancels the initial attraction force by the permanent magnet when the armature reverses in the contact closing direction, and the spring load n acts in the direction that the armature reverses in the contact opening direction. It acts in the direction of canceling the initial attractive force of the permanent magnet when the magnet is used, and as mentioned above, the spring loads m and n in both directions are well matched, resulting in high sensitivity characteristics. It proves that.

It should be noted that the shape of the protrusion 8 is not limited to the above-mentioned embodiment, for example, as shown in FIG. 6a.

It may also have a shape as shown in b.

In the figure, 30 is a switching contact for remote control, 31 is a contact spring used for this, 32 is a common terminal, 33 is a fixed terminal, 34 is a coil terminal, and 35 is a connecting plate, which are connected as shown in FIG. It is housed between the base 14 and the cover 18.

[Brief explanation of drawings]

Fig. 1 is a schematic top view showing an embodiment of the present invention, Fig. 2 is an exploded perspective view of the same, Fig. 3 is an action explanatory diagram showing the movement of the contact spring of the above, and Fig. 4 is the operating characteristics of the same. Figures 5 and 5 are the same circuit diagrams, and Figures 6a and 6l) are partial schematic top views showing other embodiments of the present invention, in which 1 is an armature, 3 is a magnetic plate, 4 is a permanent magnet, Reference numeral 6 designates a contact drive unit, 8 a protrusion, 10 a yoke, 12 a leg piece, 20 a contact spring, 22 a movable contact, and 24 a fixed contact.

Claims (1)

[Scope of utility model registration request] An elongated armature formed by sandwiching a permanent magnet magnetized in a direction perpendicular to the magnetic plates in the center of two opposing magnetic plates, and a coil wound around the center of the armature. A U-shaped yoke protrudes between both magnetic plates at both ends of the armature in the longitudinal direction, and has a length approximately equal to the length of the armature in the longitudinal direction, and has one end fixed along the longitudinal direction of the armature. The armature is pivoted at the center and is rotatably arranged in a horizontal plane, and the rotation of the armature drives the contact spring and causes the free end of the contact spring to move. A contact drive unit for opening and closing between the provided movable contact and the fixed contact placed opposite to it protrudes from one end in the longitudinal direction of the armature and is slightly more fixed than the movable contact provided at the free end of the contact spring. An electromagnetic relay in which a protruding part that engages with the end part and protrudes from the side surface of the armature contacts the fixed end part from the point of engagement with the contact spring and the contact drive part.