JP2005183262A - Single stable type polar electromagnetic relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a single stable type polar electromagnetic relay having a permanent magnet with strengthened fixation, as well as achieving sharing of components with a latching type polar electromagnetic relay performing seesaw action. <P>SOLUTION: An electromagnetic relay 10 has an electromagnet block 5 composed of fixed and movable contact spring blocks 1, 2, a coil block 3 and an armature block 4; a card 7; and a housing to house each part. A permanent magnet 41 is magnetized in forward and backward direction, and arranged with a prescribed distance d on one magnetic pole side between both poles of a yoke 31, by the above, a single stable type action is realized by sharing the components of the latching type polar electromagnetic relay, without having to newly add a biasing force part such as a spring. The magnet 41 is positioned and fixed by a joggle 43e and an arm 43a. A movable contact 23 and a fixed contact 13 are abutted and separated by the seesaw actions of an armature 42. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a single-stable type polarized electromagnetic relay.

  Conventionally, a polarized electromagnetic relay in which a permanent magnet is built in a magnetic circuit is known. There are two types of polarized electromagnetic relays: a latching type and a single stable type. In a latching type (bistable or bi-stable type) electromagnetic relay, the armature is always attracted to one magnetic pole when the electromagnetic coil is not excited, and the magnetic pole is attracted at that time even if the coil excitation is stopped Is attracted and held as it is, and is reversely attracted to the other magnetic pole by an excitation current having a different polarity. Even if the coil excitation is stopped, it is held as it is at the magnetic pole attracted at that time.

  In single-stable type (monostable type) electromagnetic relays, an attractive force in the reverse direction is generated by coil excitation to attract the armature to the other magnetic pole, and when the coil excitation is stopped, the armature is in the initial state (specific To one of the magnetic poles). Single stability in a single-stable electromagnetic relay is often performed by arranging an electromagnet built between two magnetic poles of an electromagnetic coil that attracts and separates an armature with respect to both magnetic poles.

  To realize a single-stable type polarized electromagnetic relay, for example, a coil is wound around a U-shaped iron core, and both ends facing each other form a magnetic pole, and inserted between the facing magnetic poles and fixed. And a flat yoke that forms a magnetic bypass circuit, a permanent magnet that is attached to a recess provided in the flat yoke, and is magnetized with different polarities in the thickness direction, and is in contact with the permanent magnet. In the single-stable type polarized electromagnet provided with an armature that rotates by action and contacts the magnetic pole, the flat plate yoke is formed with an asymmetric recess in the center line between the magnetic poles. 2. Description of the Related Art A permanent magnet is disposed and a magnetoresistive adjustment unit that adjusts magnetic resistance is formed (see, for example, Patent Document 1).

  Further, a protrusion serving as a rotation fulcrum is formed in a recess formed asymmetrically on the center line between the magnetic poles, and a recess is formed on an armature surface facing the recess, and the permanent magnet is fixed to the recess. A rotating fulcrum type polarized electromagnet that rotates an armature together with a permanent magnet is known (see, for example, Patent Document 2).

  Also, as a polarized electromagnetic relay that realizes a latching type and a single stable type using the same magnetic circuit parts, an armature pendulum inserted between the pole pieces depending on the position of the permanent magnet arranged between a pair of opposing pole pieces A configuration in which the operation is switched between a bistable type and a monostable type is known (see, for example, Patent Document 3).

Also, a proposal of a latching-type polarized electromagnetic relay in which the armature performs a seesaw operation, and parts of a latching-type polarized electromagnetic relay in which the armature performs a seesaw operation and a non-polar type single-stable electromagnetic relay without a built-in permanent magnet Has been made by the present applicant (see, for example, Patent Document 4).
Japanese Patent No. 2897860 JP-A-8-96685 Japanese Patent No. 2805918 JP 2002-15651 A

  However, in the single-stable electromagnetic relay as shown in Patent Document 1 and Patent Document 2 described above, the center of rotation of the armature that performs the seesaw operation is unclear, and the operation may become unstable. That is, it is presumed that the armature that performs the seesaw movement around the projection of the obtuse triangular shape that is almost flat is positioned and held by the magnetic force of the electromagnet or the permanent magnet, but in such positioning of the armature, It is considered that the armature assumes an unexpected posture due to the impact, and the operation may not be stabilized due to the frictional force due to contact with other components. In these electromagnetic relays, since the permanent magnet is mounted in the concave portion of the flat yoke, it is necessary to process the concave portion. Moreover, in the electromagnetic relay shown in Patent Document 2, since the permanent magnet and the armature integrally operate as a seesaw, the inertia of the operation object is large, and the operation speed and operation sound are disadvantageous.

  Moreover, the electromagnetic relay as shown in Patent Document 3 is a pendulum operation type electromagnetic relay in which one end of a rod-shaped armature swings, and the following problems can be considered depending on its structure. That is, since the directions of magnetization of the armature and the permanent magnet are orthogonal to each other, a strong permanent magnet is required for causing the armature to swing. Further, since the direction in which the armature swings and the direction of the main magnetic lines generated in the armature are orthogonal, an electromagnetic coil that generates a strong magnetic force in the armature is required.

  Further, in the latching type polarized electromagnetic relay in which the armature performs seesaw operation as shown in Patent Document 4, a clear center of rotation is defined for the armature, and the armature is rotatably fixed by a hinge spring. Yes. In such a polarized electromagnetic relay, it is beneficial from the viewpoint of reducing manufacturing costs and the number of components to share the components of the latching type polarized electromagnetic relay and the single stable type polarized electromagnetic relay. Realization of a single-stable type polarized electromagnetic relay sharing parts is strongly desired. It is also desired to further strengthen the fixing of the permanent magnet from the viewpoint of vibration resistance.

  The present invention solves the above-described problem, and is intended to share the components of a latching-type polarized electromagnetic relay that performs seesaw operation and to realize a single-stable electromagnetic relay in which permanent magnets are firmly fixed. An object is to provide an electromagnetic relay.

  In order to achieve the above object, an invention according to claim 1 is directed to a coil block having a coil, a coil wound around and a yoke having both ends as magnetic poles, and an auxiliary joint that is disposed and fixed between the magnetic poles. An armature having iron, a permanent magnet positioned by the auxiliary yoke, a seesaw-type armature attracted and separated by both magnetic poles of the yoke according to the excitation state of the coil, and a hinge spring for fixing them together A fixed contact spring block having a block, a fixed side terminal, a plate spring fastened to the fixed side terminal, and a fixed contact provided to the plate spring; and a plate spring fastened to the movable side terminal and the movable side terminal And a movable contact spring block having a movable contact provided on the leaf spring, and connected to both the armature and the movable contact spring block, and the contact of the fixed contact and the movable contact according to the swing of the armature. Open and close And a fixed contact spring block, a movable contact spring block, and a container having a fixed portion for fixing the card. The fulcrum is fixed to the auxiliary yoke by the hinge spring so that the fulcrum is immovable with respect to the permanent magnet, and the permanent magnet is shifted to one magnetic pole side of the two magnetic poles. The polarized electromagnetic relay is characterized in that the attraction force by which the armature is attracted and separated by the magnetic poles by being positioned and fixed to the yoke is unbalanced between the two magnetic poles and is made into a single stable type.

  According to a second aspect of the present invention, in the polarized electromagnetic relay according to the first aspect, the auxiliary yoke is formed by pressing from a flat plate, a plurality of dowels for positioning the permanent magnet, and a peripheral edge of the auxiliary yoke body. And a pair of arms formed to bend and bend from the portion and sandwich the permanent magnet, and the arm includes a protrusion that engages with the hinge spring and serves as a pivot shaft of the hinge spring. It is what.

  According to the first aspect of the present invention, in the polarized electromagnetic relay that is a latching type that performs a seesaw operation when the permanent magnet is disposed in the center of the auxiliary yoke, the permanent magnet is shifted in the direction of one of the magnetic poles. Realizing a stable type polarized electromagnetic relay, it is possible to share components, reduce the manufacturing cost and increase the number of parts without adding new biasing parts such as springs, etc. Costs required can be reduced.

  According to the invention of claim 2, since the dowel and the arm are provided on the auxiliary yoke to enhance the positioning and fixing of the permanent magnet, the permanent magnet can be securely fixed and the stable operation of the polarized electromagnetic relay is realized. The

  Hereinafter, a single stable type polarized electromagnetic relay according to an embodiment of the present invention will be described with reference to the drawings. In addition, the directions of components are additionally referred to in the drawing together with arrows as necessary. FIG. 1 shows a single-stable polar electromagnetic relay (hereinafter simply referred to as an electromagnetic relay) 10 with a cover removed. In general, the electromagnetic relay 10 includes a fixed contact spring block 1, a movable contact spring block 2, an electromagnet block 5 including a coil block 3 and an armature block 4, a card 7, and a device for storing these components therein. A body (only the body 61 of the container is shown). Details of each block will be described below. Reference is made to FIGS. 2 and 3 as appropriate.

  The fixed contact spring block 1 includes a fixed side terminal 11 formed by bending a metal plate, a metal plate spring 12 fastened to the fixed side terminal 11 with rivets, and a metal plate fixed to the plate spring 12. It is comprised by the fixed contact 13 (refer FIG. 3).

  The movable contact spring block 2 includes a movable side terminal 21 made of a metal plate, a metal leaf spring 22 fastened to the movable side terminal 21 with a rivet, and a metal movable contact 23 fixed to the leaf spring 22. (See FIG. 3). Further, a protruding piece 22a for mounting the card 7 is provided on the right end of the leaf spring 22 so as to protrude rightward. The fixed contact spring block 1 and the movable contact spring block 2 are arranged by being fitted into a groove-shaped fixed portion 61c formed in the body 61 of the container body in such a manner that the fixed contact 13 and the movable contact 23 face each other. Has been.

  Next, the electromagnet block 5 will be described mainly with reference to FIG. The electromagnet block 5 includes the coil block 3 and the armature block 4 as described above. The coil block 3 in the single-stable type polarized electromagnetic relay 10 is generally configured by winding a coil 33 around a yoke 31 as shown in the center left of FIG. The coil 31 is wound around the central portion between the end portions 31a and 31b of the yoke 31 via the bobbin 32 made of resin and the bobbin 32 having a T-shaped magnetic pole at the tips of the portions 31a and 31b. The rotating coil 33 and a pair of coil terminals 34 which are fixed integrally with the bobbin 32 and to which the wire ends of the coil 33 are connected (for example, soldered) are formed. Further, a groove (not shown) for inserting the yoke 31 is formed on the lower surface side of the bobbin 32.

  Here, the manufacturing procedure of the coil block 3 will be described. First, the yoke 31 is inserted into the insertion groove of the bobbin 32 described above, the coil wire is wound around the bobbin 32, the coil 33 is provided, and then both ends of the coil wire are connected to the pair of coil terminals 34, respectively. . Thereby, the coil block 3 is obtained.

  The armature block 4 is configured by laminating an auxiliary yoke 43, a permanent magnet 41, an armature 42, and a hinge spring 44 in this order, as shown in the upper part and the right center of FIG.

  The permanent magnet 41 is formed in a plate shape (a rectangular parallelepiped shape in the example of FIG. 2) whose length in the left-right direction is shorter than the length between both end portions 31a, 31b of the yoke 31. Further, with respect to the front-rear direction, the front surface of the permanent magnet 41 is disposed so as to slightly protrude forward from the tips of both end portions 31 a and 31 b of the yoke 31. In the left-right direction, the permanent magnet 41 in the electromagnetic relay 10 realizes a single-stable type operation, that is, without adding a biasing force component such as a new spring, the armature 42 becomes the magnetic pole of the yoke 31. In order to make the attraction force separated and attracted unbalanced between the two magnetic poles, the magnetic force is shifted by a predetermined distance d in the direction of one of the magnetic poles (the right direction in FIG. 2).

  The armature 42 is formed in a plate shape whose length in the left-right direction is longer than the length between both end portions 31a and 31b of the yoke 31, and is substantially centered on the rear surface facing the permanent magnet 41 as shown in the view of arrow A. And a pair of protrusions 42c for fastening to the hinge spring 44 on the front surface. The protrusion 42a formed on the right side is used as a connecting portion for operating a movable contact of an electromagnetic relay (not shown) (described later).

  The auxiliary yoke 43 has a left and right protrusion 43d, a lower leg 43b, a plate-like portion having a length in the left-right direction that is substantially the same as the length between the both ends 31a and 31b of the yoke 31 and slightly shorter. Furthermore, it is provided with a pair of arms 43a formed by bending forward from the upper and lower sides. The protrusion 43d is placed on the rear side of the T-shaped end portion of the yoke 31, and the leg 43b is fitted into a groove provided in the body of an electromagnetic relay (not shown), and the auxiliary yoke 43 is respectively attached. Used to fix.

  A plurality of dowels (projections) 43 e for positioning the permanent magnet 41 are further formed on the front surface of the auxiliary yoke 43. These dowels 43e are formed so as to be uniformly shifted by the predetermined distance d described above in order to dispose the permanent magnet 41 from the center. Each of the two arms 43a is formed with a cylindrical shaft portion 43c projecting outward. The central axis of the shaft portion 43c formed in the vertical direction is set as a rotation center when the armature 42 performs a seesaw operation. As will be described later, using the shaft portion 43c and the hinge spring 44, The auxiliary yoke 43, the permanent magnet 41, and the armature 42 are fixed so that the center of rotation is fixed. In addition, what formed each part of the auxiliary yoke 43 left-right symmetrically and arrange | positioned the permanent magnet left-right symmetrically can be used for a polarized electromagnetic relay of a latching type (bistable type).

  The hinge spring 44 integrally fixes the permanent magnet 41, the armature 42, and the auxiliary yoke 43, is formed of an elastic thin metal plate, has a cross shape with arms extending vertically and horizontally, A central portion 44a attached to the front surface of the pole 42, and bent from the ends of a pair of arms extending vertically from the central portion 44a so as to be engaged with the outer surface of the arm 1 of the auxiliary yoke 43. And both side portions 44b. And the hole 44e in which the axial part 43c formed in the arm 43a of the auxiliary yoke 43 is inserted is drilled in the both sides 44b. A pair of arms extending to the left and right of the central portion 44a are provided with holes 44d into which the protrusions 42c of the armature 42 are inserted.

  Here, the assembly procedure of the armature block 4 will be described. First, the permanent magnet 41 is arranged on the auxiliary yoke 43 by positioning with the dowel 43e, then the armature 42 is arranged on the permanent magnet 41, and finally the protrusion 42c of the armature 42 is connected to the hinge spring 44. The shaft portion 43c of the arm 43a of the auxiliary yoke 43 is inserted into the hole 44e of the hinge spring 44. As a result, the armature block 4 in which the auxiliary yoke 43, the permanent magnet 41, and the armature 42 are integrally fixed by the hinge spring 44 is obtained.

  The obtained armature block 4 is integrated with the coil block 3 with the left and right protrusions 43d of the auxiliary yoke 43 mounted on the rear side of the T-shaped end of the yoke 31, as shown in FIG. In addition, an electromagnet block 5 for a single stable type polarized electromagnetic relay is obtained.

  Next, assembly of the electromagnetic relay 10 will be described with reference to FIGS. Each block and the card 7 described above are incorporated into a body 61 that is a lower component of the body 6 of the electromagnetic relay 10 shown in FIG. As shown in FIG. 3, the fixed contact spring block 1, the movable contact spring block 2, and the coil block 3 are first incorporated into the body 61. Next, the armature block 4 is assembled so that the left and right ends of the auxiliary yoke 43 in the armature block 4 are placed on the yoke 31 of the coil block 3. At this time, the leg portion 43b (see FIG. 2) of the auxiliary yoke is fitted and fixed in a groove (fixed portion) (not shown) of the body 61. Subsequently, the card 7 is assembled so that the protrusion 42 a of the armature 42 is inserted into the hole 7 b of the card 7 and the protrusion 22 a of the leaf spring 22 is inserted into the hole 7 a of the card 7. At this time, a card fixing projection 61b (see FIG. 1) formed in the body 61 is slidably inserted back and forth into the hole 7c of the card 7. The body 61 is provided with a partition wall 61a that partitions both the spring blocks 1 and 2 and the electromagnet block 5 (see FIG. 1). As shown in FIG. 4, the main body block 9 formed by incorporating each block and card into the body body 61 is fixed with a cover 62, and the single-stable type polarized electromagnetic relay 10 is completed.

  Here, returning to FIG. 1, the mechanical operation of the electromagnetic relay 10 will be described. When the armature 42 performs a seesaw movement around its substantially center, the card 7 performs the front / rear movement (left-right movement in the figure), and the leaf spring 22 performs the front / rear movement. The movable contact fixed to the leaf spring 22 23 contacts / separates the opposed fixed contact 13 to close / open the electromagnetic relay 10.

  Next, the rotating structure of the armature will be described with reference to FIGS. In the single-stable electromagnetic relay of the present invention, the same components can be used in common with the latching-type polarized electromagnetic relay other than the permanent magnet 41 and the auxiliary yoke 43. Depending on the relationship between the size and the size of the permanent magnet, it can be shared in many cases). The electromagnet block 105 for the latching type polarized electromagnetic relay is basically symmetrical as shown in FIG. 5B, whereas in the electromagnet block 5 according to the present invention, the permanent magnet 41 is a yoke. The auxiliary armature 43 is positioned and fixed asymmetrically left and right by shifting by a predetermined distance d from the position of a pivotal fulcrum (described later) of the armature 42 on the substantially symmetrical axis 31. By shifting the permanent magnet 41 by this predetermined distance d, a single-stable electromagnetic relay can be realized, and it is therefore necessary to use a dedicated positioning member. When the permanent magnet 41 is shifted, the rotation of the armature 42 becomes unbalanced between the two magnetic poles in the electromagnet block, and a single stable state is realized.

  As shown in FIG. 6, the fulcrum of the rotation operation of the armature 42 in the electromagnet block 5 is the contact between the protrusion 42 b and the permanent magnet 41, which protrudes from the rear surface facing the permanent magnet 41 of the armature 42. It becomes a point. In order to stabilize the rotational operation, the fulcrum is formed in a straight line by a plurality of dot lines or continuous lines (that is, the protrusions 42b have a plurality of points or lines), and the rotation of the seesaw movement of the armature 42 is performed by the straight lines. A moving axis is defined. Further, the armature block is configured by aligning the center axis of the columnar shaft portion 43c formed on the pair of arms 43a of the auxiliary yoke 43 so as to protrude outward and the above-described rotation axis. Has been. By making these axes coincide with each other with high accuracy, a stable and smooth rotation of the armature 42 is realized. The state of the fulcrum of the rotation operation shown in FIG.

  Next, the operation of the single stable type polarized electromagnetic relay will be described in comparison with the latching type polarized electromagnetic relay. 7A to 7D show the relationship between the ON / OFF of the coil current of the electromagnet block 5 and the armature rotation operation in the single-stable type polarized electromagnetic relay of the present invention, and FIG. FIG. 9A to FIG. 9G and FIG. 10 show the same relationship for the latching type polarized electromagnetic relay. 7 and 9, the auxiliary yokes 43 and 143 are shown as magnetic materials.

  As shown in FIG. 7A, the armature 42 of the single-stable type polarized electromagnetic relay is caused by the rotational moment by the permanent magnet 41 in the direction in which the permanent magnet 41 is shifted when the current of the coil 33 is OFF. It is sucked and tilted at an angle α. The permanent magnet 41 is magnetized in a direction toward the armature 42 (vertical direction in the figure), and the armature 42 is a magnetic body. The magnetic flux generated by the magnetic charge of the permanent magnet 41 includes, for example, a counterclockwise magnetic flux b1 on the left side of the permanent magnet 41 (the left side in the figure, the same applies hereinafter) and a clockwise magnetic flux b2 on the right side of the permanent magnet ( When the magnetization direction is reversed up and down, the directions of the magnetic fluxes b1 and b2 are also reversed).

  Here, the counterclockwise direction is defined as the positive direction with respect to the direction of the rotational moment M about the rotation fulcrum (near the protrusion 42b) acting on the armature 42 and the rotational direction (angle θ) of the armature 42. Further, at the position of θ = 0, the armature 42 is in a state parallel to the auxiliary yoke 43. When the armature 42 rotates, the left (left side in the figure) end of the armature moves in the vertical direction in the figure. The x axis is defined in the downward direction. When θ = 0, x = 0, and when θ = ± α, x = ± Δx. The value of x represents the moving distance (stroke) of the card 7 described above, and is therefore related to the moving distance of the movable contact 23. The state of the armature shown in FIG. 7A is represented by a point a in the graph of the rotational moment M and the rotational angle θ shown in FIG. Next, as shown in FIG. 7B, when an exciting current is passed through the coil 33 (right ON) so that the magnetic flux b3 in the same direction as the magnetic flux b2 is generated on the right side of the armature 42, the right side of the yoke 31 Since the magnetic flux at the magnetic pole of the yoke 31 is strengthened and the magnetic flux at the left magnetic pole of the yoke 31 is weakened, a clockwise moment is generated as a whole, and the armature 42 is in the state of point b in FIG.

  When the state of the right current ON is maintained, as shown in FIG. 7C, the armature 42 is attracted to the right magnetic pole to be in the state of point c in FIG. 8, and this state is maintained. The state at this point c is a state in which the armature 42 is attracted to the end portion 31b of the yoke 31 in FIG. 1, and the rotational moment due to the magnetic force overcomes the urging force of the leaf spring 22 to The movable contact 23 is in contact with the fixed contact 13 by being displaced to the right. Subsequently, as shown in FIG. 7D, when the excitation current is turned off, the armature returns to the state of point a through the state of point d in FIG. To do. In this manner, the armature 42 of the electromagnet block 5 can perform a single stable type seesaw operation. As described above, the seesaw operation opens and closes the circuit between the movable contact and the fixed contact via the card.

  Next, the operation of the electromagnet block 105 of the latching type polarized electromagnetic relay will be described. The direction of the rotational moment M acting on the armature 42, the direction of rotation of the armature 42 (angle θ), and the direction of movement of the armature (x axis) are defined in the same manner as in FIG. In the electromagnet block 105, the permanent magnet 42 is provided symmetrically with respect to the rotation fulcrum of the armature 42 as shown in FIG. Accordingly, the magnetic fluxes b1 and b2 generated around the fulcrum by the permanent magnet 41 are symmetrical. In the state where the coil current is OFF, the rotational moment M with respect to the armature 42 is substantially zero (the state at the point a in FIG. 10), and when the armature 42 is tilted to the left or right for some reason, the armature 42 is moved in that direction. It will be in the state adsorbed by the. Next, as shown in FIG. 9B, when an exciting current is passed through the coil 33 so that a magnetic flux b3 in the same direction as the magnetic flux b1 is generated on the left side of the armature 42 (left ON), the left side of the yoke 31 10 is strengthened, and the magnetic flux at the right magnetic pole of the yoke 31 is weakened. Therefore, a counterclockwise moment is generated as a whole, and the armature 42 is attracted to the left magnetic pole, and the state of point b in FIG. It becomes.

  Subsequently, when an exciting current in the opposite direction to the above is supplied to the coil 33 (right ON), the magnetic flux at the right magnetic pole is strengthened and the magnetic flux at the left magnetic pole is weakened, so that a clockwise moment is generated as a whole. The armature 42 is attracted to the right magnetic pole through the states shown in FIGS. 9C and 9D, that is, the states of points c and d in FIG. 10, and the points in FIGS. It will be in the state of e. The state of this point e is a state in which the movable contact 23 is in contact with the fixed contact 13 when the above FIG. 1 is regarded as a diagram of a latching type polarized electromagnetic relay. Next, when the coil 33 is turned to the left current ON state, the armature 42 passes through the states shown in FIGS. 9F and 9G, that is, the states of the points f and g in FIG. Adsorbed to the left magnetic pole, the state of point b in FIGS. 9B and 10 is obtained. When the current of the coil 33 is turned off at the point b or the point e in FIG. 10, the state is maintained by the permanent magnet as described above.

  The state transition diagram shown in FIG. 10 is point-symmetric about the origin O, reflecting the symmetry of the electromagnet block 105. On the other hand, the state transition diagram shown in FIG. 8 is asymmetric reflecting the operation of the single-stable type polarized electromagnetic relay.

  Next, two methods for constructing a single-stable type polarized electromagnetic relay based on the components of the latching type polarized electromagnetic relay will act on the armature with reference to FIG. 7, FIG. 9 and FIG. A description will be given from the viewpoint of the urging force (the urging force by the attractive force Fm of the permanent magnet and the urging force by the spring restoring force Fs). FIGS. 11A and 11B show the relationship (armature state) between the biasing force acting on the armature 42 and the rotation angle of the armature 42 when the coil 33 is not excited. The biasing force acting on the armature 42 at the left-right rotation position of the armature 42 is bilaterally symmetric in the latching type polarized electromagnetic relay, and is bilaterally asymmetric in the single stable type polarized electromagnetic relay. Conversely, if the biasing force acting on the armature 42 at the left-right rotation position of the armature is symmetric, a latching-type polarized electromagnetic relay is realized, and if it is asymmetrical, a single-stable-type polarized electromagnetic relay is realized. FIG. 11A shows a method of configuring the single-stable type polarized electromagnetic relay of the present invention, and realizes the asymmetry of the urging force by shifting the permanent magnet 41. FIG. 11B realizes the asymmetry of the urging force by adding a new urging force (adding a spring).

  First, the biasing force acting on the armature of the latching type polarized electromagnetic relay will be described. The biasing force acting on the armature of the latching-type polarized electromagnetic relay is composed of a magnet attractive force Fm and a spring restoring force Fs by a permanent magnet, as shown in the left diagram of FIG. Symmetric. The spring that generates the spring restoring force Fs is a leaf spring 22 provided in the movable contact spring block 2 shown in any of the previous drawings, and the restoring force Fs of the leaf spring 22 is contacted via the card 7. Acts on the pole 42. The horizontal axis in FIG. 11 indicates the rotation angle θ of the armature 42 or the parallel movement distance (stroke) x of one end of the armature 42 as shown in FIG. The horizontal limit on the horizontal axis is θ = ± α or x = ± Δx. The magnet attraction force Fm of one of the two urging forces exerts an urging force on the armature 42 in the direction in which the armature state moves away from the origin O on the horizontal axis. That is, the state where the armature 42 is parallel to the auxiliary yoke 43 is an unstable state under the action of the magnet attractive force Fm, and the state at θ = ± α is a stable state.

  On the other hand, the urging force by the spring restoring force Fs exerts on the armature 42 the force of the armature state toward the origin O of the horizontal axis (the conceptual direction of the urging force is indicated by a horizontal white arrow in the figure). The spring restoring force Fs is displayed as -Fs (spring load) with the sign reversed so that the absolute value comparison with the magnet attractive force Fm is easy. In the latching type polarized electromagnetic relay, in the entire range −α ≦ θ ≦ + α within the rotation limit of the armature 42 (or at least at the rotation limit θ = ± α), the resultant force of the magnet attractive force Fm and the spring restoring force is A so-called bistable type polarized electromagnetic relay having two stable points, which is configured such that the pole state is in a direction away from the origin O, is realized.

  One of the stable points at θ = ± α described above, for example, when the state of θ = −α is an unstable point and the state of θ = α is a stable point, a monostable type, that is, a single-stable type polarized electromagnetic relay is realized. . When the permanent magnet 41 is shifted as shown in FIG. 7A, the magnet attractive force Fm becomes asymmetric with respect to the origin O as shown in the right figure of FIG. At θ = −α, which is one rotation limit of the armature 42, the resultant force of the magnet attractive force Fm and the spring restoring force is the direction in which the armature state is directed toward the origin O, and the other rotation limit is θ = α. The resultant force is in the direction in which the armature state moves away from the origin O, so that it becomes unstable when θ = −α and stable when θ = α, and the single-stable type polarized electromagnetic relay according to the present invention is realized.

  Further, as described above, when the asymmetry of the urging force (the resultant force) is realized by adding the urging force by adding a new spring instead of shifting the permanent magnet and changing the magnet attractive force Fm, FIG. It becomes as shown in the right figure of b). The left diagram in FIG. 11B shows the urging force in the latching-type polarized electromagnetic relay, and is the same as the left diagram in FIG. The spring restoring force Fs is further strengthened so as to obtain a resultant force in which the armature state moves toward the origin O by overcoming the magnet attractive force Fm on the rotation limit θ = −α side. The operation of the electromagnetic relay is performed by applying an urging force that overcomes the stable state to the above-described armature stable state of FIG.

  The present invention is not limited to the above-described configuration, and various modifications can be made. For example, the shape of the auxiliary yoke can be fixed to only a single adhesive by making it compatible with both single-stable and latching electromagnetic relays. The degree of sharing of components between single-stable type polarized electromagnetic relays and latching type polarized electromagnetic relays is determined from the perspective of preventing confusion of finished products and ensuring safety through secure fixing. Just decide. In addition, the material forming the auxiliary yoke is not limited to a magnetic material, a non-magnetic material may be used, and a non-magnetic material and a magnetic material may be used in combination. The selection may be made according to the shape of the permanent magnet and the strength of magnetization. When the auxiliary yoke is formed of a non-magnetic material, it is not affected by variations in magnetic resistance due to shape fluctuations between the individual auxiliary yokes, changes in magnetization state over time, fluctuations in magnetization, etc. Stable operation is realized. In particular, when the permanent magnet is magnetized after the assembly of the electromagnetic relay, it is not necessary to consider the magnetic influence due to the auxiliary yoke as the positioning member.

FIG. 3 is an internal plan view of the single stable type polarized electromagnetic relay of the present invention. The perspective view explaining the assembly of the electromagnet block of a polarized electromagnetic relay same as the above. The explanatory perspective view in the middle of the assembly of the same polarized electromagnetic relay. The perspective view explaining the assembly of a polarized electromagnetic relay same as the above. (A) is a partial cross-sectional schematic diagram of an electromagnet block of the above-described single-stable type polar electromagnetic relay, and (b) is a part of an electromagnet block of a latching type polar electromagnetic relay formed by sharing parts with the above-described electromagnetic relay. FIG. Explanatory drawing of the rotation mechanism of the armature in the polarized electromagnetic relay of this invention. (A)-(d) is sectional drawing of the electromagnet block explaining the armature rotation operation | movement in the single stable type | mold polarized electromagnetic relay of this invention. The state transition diagram which shows the relationship between the rotation moment which acts on the armature of a polarized electromagnetic relay same as the above, and the rotation angle of an armature. (A)-(g) is sectional drawing of the electromagnet block explaining the armature rotation operation | movement in the latching type polarized electromagnetic relay formed by sharing the components of the electromagnetic relay same as the above. The state transition diagram which shows the relationship between the rotation moment which acts on the armature of a latching type polarized electromagnetic relay same as the above, and the rotation angle of an armature. (A) is a diagram showing the relationship between the force acting on the armature and the rotation angle of the armature in the latching type polarized electromagnetic relay and the single stable type polarized electromagnetic relay of the present invention constructed based on this, and (b) is the latching. FIG. 5 is a diagram showing the relationship between the force acting on the armature and the rotation angle of the armature in the single-stable-type polarized electromagnetic relay in the case of configuring the type-polarized electromagnetic relay and a spring biasing force based on the same.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fixed contact spring block 2 Movable contact spring block 3 Coil block 4 Armature block 6 Body 7 Card 10 Electromagnetic relay 11 Fixed side terminal 12, 22 Leaf spring 13 Fixed contact 21 Movable side terminal 23 Movable contact 31 Relay 31a, 31b End 33 Coil 41 Permanent magnet 42 Armature 43 Auxiliary yoke 43a Arm 43c Projection 43e Dowel 44 Hinge spring

Claims (2)

A coil block having a coil and a yoke around which the coil is wound and having both ends as magnetic poles;
An auxiliary yoke arranged and fixed between the magnetic poles, a permanent magnet positioned by the auxiliary yoke, and a seesaw-type armature attracted and separated by both magnetic poles of the yoke according to the excitation state of the coil; An armature block having a hinge spring for fixing them together;
A stationary contact spring block having a stationary terminal, a leaf spring fastened to the stationary terminal, and a stationary contact provided on the leaf spring;
A movable contact spring block having a movable terminal, a leaf spring fastened to the movable terminal, and a movable contact provided on the leaf spring;
A card that is connected to both the armature and the movable contact spring block, and performs contact and separation of the fixed contact and the movable contact according to the swinging of the armature;
In the electromagnetic relay comprising the fixed contact spring block, the movable contact spring block, and a container having a fixed portion for fixing the card,
The armature has a fulcrum for seesaw rotation at its substantially center, and is fixed to the auxiliary yoke by the hinge spring so that the fulcrum is immovable with respect to the permanent magnet. The attraction force by which the armature is attracted and separated by the magnetic pole is unbalanced between the two magnetic poles by shifting to one of the magnetic poles and being fixed to the auxiliary yoke. A polarized electromagnetic relay characterized by The auxiliary yoke is formed by pressing from a flat plate, and is formed so as to sandwich a plurality of dowels for positioning the permanent magnet, and bend by extending from the peripheral edge of the auxiliary yoke body. A pair of arms,
The polarized electromagnetic relay according to claim 1, wherein the arm includes a protrusion that engages with the hinge spring and serves as a pivot shaft of the hinge spring.

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