JPS6324287B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a polarized latching relay that opens and closes contact portions by alternately applying pulsed excitation currents in different directions from the outside.

[Background Art] As a polarized latching relay, as shown in FIG. 6, a cylindrical plunger 2 made of a magnetic material is slidably inserted into a cylindrical coil bobbin 3 made of a non-magnetic material. An excitation coil 20 is wound around the outer circumference, and a magnetic plate 41 disposed at the lower end of the coil bobbin 3 is magnetized with a permanent magnet 42.
Conventionally, a device has been developed in which a contact portion (not shown) is opened and closed by a plunger 2 whose upper end portion 46 is biased upward by a spring 43.

In this device, in the state shown in the figure, the upper end portion 46 of the plunger 2 is urged upward by a spring 43, and its position is regulated by a stopper 44. When the coil 20 is energized in this state, the plunger 2 is attracted to the inside of the coil 20 and is attracted to the magnetic plate 41 by the magnetic force of the permanent magnet 42. Therefore, even if the energization to the coil 20 is stopped, Plunger 2 maintains its position.

Next, when the coil 20 is energized in the opposite direction, the plunger 2 is released from the holding and attracting force of the permanent magnet 42, is urged upward by the spring 43, and returns to its original position.

Therefore, this polarized latching relay requires a spring 43 that urges the plunger 2 upward, and also requires a permanent magnet 42 in addition to the plunger 2, the magnetic plate 41, and the yoke 45. It has the disadvantage that it has a large number of parts and is difficult to downsize due to its structure.Furthermore, since the plunger 2 is attracted and held from the permanent magnet 42 through the yoke 45, the attraction and holding force by the permanent magnet 42 is weak. It has the disadvantage that the contact pressure at the contact portion cannot be increased, and the current capacity that can be opened and closed is reduced.

[Object of the Invention] The present invention has been made in view of the above points, and its purpose is to provide a polarized latch that requires a small number of parts and can provide a large contact pressure at the contact portion. to provide a link relay.

[Disclosure of the Invention] The present invention provides a plunger formed of a columnar permanent magnet magnetized in the axial direction;
A coil bobbin that accommodates the plunger so as to be slidable in its axial direction, a pair of magnetic plates located at both ends of the coil bobbin, and a central magnetic plate with the coil bobbin inserted between the two magnetic plates.
A pair of magnetic pieces connecting both of the magnetic plates and the central magnetic plate at different sides when viewed from the coil bobbin are wound around the coil bobbin between one of the magnetic plates and the central magnetic plate. an output shaft protruding from the plunger and protruding through a hole formed in the one magnetic plate;
It consists of a contact part driven by this output shaft, and a latching action is obtained by the plungers formed of permanent magnets being attracted to the magnetic plates by their own magnetism at both ends of the coil bobbin. This is how it was done.

The present invention will be described below in detail based on the illustrated embodiment. This polarized latching relay is housed in a case 48 consisting of upper and lower housings 31 and 32 as shown in FIG. As shown in the figure and FIG. 2, the plunger 2 is formed of a cylindrical permanent magnet magnetized in the axial direction, and has an output shaft 9 protruding from one end thereof, and a hollow cylindrical shaft made of a non-magnetic material. It is slidably inserted into the coil bobbin 3. Magnetic plates 15 and 16 are arranged at both ends of the coil bobbin 3, and a central magnetic plate 17 is arranged at the center of the coil bobbin 3. Further, magnetic pieces 12, 12 are provided which connect the magnetic plate 15 and the central magnetic plate 17 and the magnetic plate 16 and the central magnetic plate 17 at different sides when viewed from the coil bobbin 3, respectively.

A coil 20 that excites the plunger 2 is wound around a coil bobbin 3 between one magnetic plate 15 and a central magnetic plate 17.
The output shaft 9, which protrudes from the magnetic plate 15 and is inserted into a hole 18 formed in the magnetic plate 15, has a pair of flanges 38 and 39 at its tip, and between the flanges 38 and 39, It has a movable contact 28 and engages with the contact plate 10 which is pivotally supported by the pivot shaft 23, and the flange 38 on the plunger 2 side and the contact plate 1
0, a spring 37 for applying contact pressure is installed.

Here, as is clear from FIG. 4, the magnetic plates 15, 16, the central magnetic plate 17, and the magnetic pieces 12, 12 are each part of a single magnetic plate 14 bent in an S-shape. It is formed as a single piece. That is, among the three pieces arranged in parallel, the ones located at both ends are the magnetic plates 15, 16,
The one located in the center is a central magnetic plate 17, the other two pieces are magnetic pieces 12, 12, and a pivot shaft 23 that pivots the contact plate 10.
are inserted into insertion holes 25 provided in a pair of upright pieces 24, 24 extending from one end of the magnetic plate 14, respectively.

The magnetic plate 15 also has an output shaft 9 as described above.
A hole 18 for inserting the coil bobbin 3 is provided in the central magnetic plate 17.
9 are required, and these are provided in the magnetic plate 15 and the central magnetic plate 17 as U-shaped notches that open in the same direction, and when assembled, the coil bobbin 3 around which the coil 20 is wound is After installing the plunger 2 with the output shaft 9 on the
By fitting into the letter-shaped magnetic plate 14 from the opening direction of the holes 18 and 19 formed as the U-shaped notches, it can be assembled with one touch.

In FIG. 2, 30 is a fixed contact that faces the movable contact 20 and constitutes a contact portion, and 26 is an output terminal 27.
and the contact plate 10, 33 and 34 are coil terminals, 35 is a retainer between the plunger 2 and the output shaft 9, and the magnetic plate 16 is provided with an escape hole 36 into which the retainer 35 is fitted. It is being

Next, the operation will be explained. When the contact portion is opened, as shown in FIG.
It is magnetically attracted to and maintains its position. In this state, when the coil 20 is energized in a specific direction, the plunger 2 made of a permanent magnet
is attracted to the coil 20 side, causing the output shaft 9 to protrude largely from the hole 18 of the magnetic plate 15, and as shown in FIG. 2, by pressing the contact plate 10 via the spring 37, the movable contact 28 is It is brought into contact with the fixed contact 30.

At this time, the contact pressure between the fixed contact 30 and the movable contact 28 is set by the spring 37, and therefore the output shaft 9 and the plunger 2
Although the repulsive force of the spring 37 is applied to the coil 20, since the plunger 2 made of a permanent magnet is attracted to the magnetic plate 15, the plunger 2 does not return, and therefore, the current supply to the coil 20 is stopped. However, the plunger 2 remains in the state shown in FIG.

Next, from the state shown in FIG. 2, the coil 20
When the current is applied in the opposite direction to the previous one, the plunger 2 is driven in the opposite direction and is attracted to the magnetic plate 16 as shown in FIG. In order to pull back the contact plate 10, the contact parts are opened.

Opening/closing of the contact portion can be done by simply passing a pulsed current through the coil 20, and once the plunger 2 has moved, even if the current is cut off, the plunger 2 will remain in its position due to attraction to the magnetic plates 15 and 16. Moreover, since this attraction is performed by the plunger 2, which is made of a permanent magnet, by its own magnetism, the attraction force is large, and the spring 37
Even if the contact pressure is increased by increasing the spring force, the latching operation will not become unstable.

In addition, in the present invention, the S-shaped magnetic plate 14
Instead, a substantially E-shaped magnetic plate 40 as shown in FIG. 7a cannot be used. This is because when such a magnetic plate 40 is used, when the plunger 2 is attracted to the magnetic plate 15 side, in addition to the main magnetic path as shown by arrow A, there is also a main magnetic path as shown by arrow B. This is because an auxiliary magnetic path is formed, making it difficult to separate the plunger 2 that is attracted to the magnetic plate 16. Body piece 12,1
2 is in an S-shape on a different side when viewed from the coil bobbin 3, as shown in Figure b, the magnetic resistance of the submagnetic path indicated by arrow C is large,
Since most of the magnetic flux flows into the main magnetic path, the magnetic plate 1
The plunger 2 can be reliably separated from the plunger 6.

[Effects of the Invention] As described above, in the present invention, the plunger is formed of a columnar permanent magnet magnetized in the axial direction, a pair of magnetic plates located at both ends of the coil bobbin, and a double magnetic plate. A central magnetic plate located between the body plates and into which the coil bobbin is inserted; a pair of magnetic pieces connecting both magnetic plates and the central magnetic plate at different sides when viewed from the coil bobbin; and one magnetic plate. Since the coil is wound around the coil bobbin between the body plate and the central magnetic plate, a latching relay can be constructed without the need for a return spring or other permanent magnet. In addition, since the plunger, which is a permanent magnet, latches by adhering to the magnetic plates located at both ends of the coil bobbin, it is easy to obtain a large adsorption force, and the contact point It is possible to increase the contact pressure of the contact portion and the current capacity that can be opened and closed at the contact portion.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an embodiment of the present invention, Fig. 2 is a horizontal sectional view of the same, Fig. 3 is a side view showing the appearance of the same, and Fig. 4 is a perspective view of an S-shaped magnetic plate used in the above. Figure 5 is an exploded side view showing the assembly of the same as above, Figure 6 is a sectional view of the conventional example, Figure 7 a and b are E
It is an explanatory diagram of the magnetic path in the case of a character-shaped magnetic material plate and the case of an S-shaped magnetic material plate, and 2 is a plunger, 3 is a coil bobbin, 9 is an output shaft, 12 is a magnetic material piece, 15,
16 is a magnetic plate, 17 is a central magnetic plate, and 20 is a coil.

Claims (1)

[Scope of Claims] 1. A plunger formed of a columnar permanent magnet magnetized in the axial direction, a coil bobbin in which the plunger is housed so as to be slidable in the axial direction, and a plunger located at both ends of the coil bobbin. A pair of magnetic plates, a central magnetic plate between which the coil bobbin is inserted, and a pair of magnetic plates connecting the magnetic plates and the central magnetic plate at different sides when viewed from the coil bobbin. a magnetic piece, a coil wound around the coil bobbin between one magnetic plate and a central magnetic plate, and a coil protruding from the plunger and protruding through a hole formed in the one magnetic plate. A polarized latching relay comprising an output shaft and a contact portion driven by the output shaft. 2. The pair of magnetic plates located at both ends of the coil bobbin, the central magnetic plate, and the pair of magnetic pieces are integrally formed of a single S-shaped magnetic plate. A polarized latching relay according to claim 1. 3 The one end piece and the center piece of the S-shaped magnetic plate, which are one magnetic plate and the central magnetic body, are formed in the same direction and have U-shaped notches into which the output shaft and coil bobbin are inserted, respectively. 3. A polarized latching relay according to claim 2, further comprising a portion.