JP4281251B2 - Electromagnetic relay - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic relay that opens and closes contacts by electromagnetic force.
[0002]
[Prior art]
As an electromagnetic relay widely used in an electric circuit, for example, there is one described in JP-A-7-235248.
[0003]
This consists of a switch part for opening and closing an electric circuit connected to the electromagnetic relay, and a solenoid part for performing a predetermined operation by energizing / disconnecting a built-in coil. When the coil is energized, the plunger is attracted to the magnetic path member and moves away from the movable contact carrier, and the movable contact carrier that carries the pair of movable contacts in a short-circuited state by the biasing force of the contact spring, The fixed contacts are moved in a direction approaching the pair of fixed contact carriers that are detachably supported with respect to the pair of movable contacts, and the respective contacts come into contact with each other. As a result, the pair of fixed contact carriers is electrically connected via the movable contact carrier, and the electromagnetic relay is closed. On the other hand, when the energization of the coil is interrupted, the magnetic force of the fixed magnetic path member disappears, and the urging force of the return spring moves the plunger closer to the movable contact carrier so that the movable contact carrier is brought into contact with the stopper provided in the housing. Push up until touching. Thereby, since a movable contact leaves | separates from each fixed contact, the electrical continuity between a pair of fixed contact carrier is cut off, and the electromagnetic relay is in an open state. In the open state of the electromagnetic relay, a gap, that is, a so-called contact gap is formed between the movable contact and the fixed contact.
[0004]
[Problems to be solved by the invention]
By the way, when the electromagnetic relay is opened, arc discharge may occur between the two contacts at the moment when the movable contact is separated from the fixed contact. Since arc discharge causes contact damage and the like, it is necessary to extinguish in a short time even if arc discharge occurs. In an electromagnetic relay, so-called interruption, which is extinguished in a short time even when arc discharge occurs, is one of important characteristics.
[0005]
As a countermeasure, the contact gap is increased. In general, the relationship between the movement distance of the plunger when the electromagnetic relay is closed to open, that is, the so-called stroke S and the contact gap G is expressed by the following (Equation 1).
[0006]
(Formula 1) S = G + M
Here, M is a running distance for applying an impact force to the movable contact (improving the separation between the movable contact and the fixed contact). As is clear from (Equation 1), when the contact gap is increased in order to improve the blocking performance, the stroke also increases. In this case, in order to maintain the responsiveness of the electromagnetic relay, the operating force of the solenoid unit must be increased. That is, there is a problem that the physique of the magnetic circuit component including the coil becomes large, and thus the physique of the electromagnetic relay becomes large.
[0007]
The present invention has been made in view of the above points, and an object of the present invention is to provide an electromagnetic relay having a high breaking performance by expanding a contact gap without increasing the size of a solenoid portion.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention employs the following technical means.
[0009]
The electromagnetic relay according to claim 1 of the present invention, the first elastic member is disposed in the solenoid portion movable contact for urging the movable contact carrier in the direction toward the fixed contact carrier is arranged in the housing A second elastic member that biases the plunger in a direction away from the fixed contact carrier; and a first restriction that is provided in the housing and restricts movement of the movable contact carrier in a direction away from the fixed contact carrier. And a second restricting portion for restricting the movement of the plunger by the urging force of the second elastic member , provided at a fixed portion of the housing and the solenoid portion , the fixed contact carrier, the movable contact carrier, 1 elastic member, 2nd elastic member, 1st control part, 2nd control part, and plunger are the 2nd elastic member, plunger, 2nd control part, fixed contact carrier in the advance and retreat direction of the plunger Movable contact carrier, a first elastic member, disposed in the order of the first restricting portion, when the plunger is in contact with the second restricting portion, the first gap is formed between the movable contact and the fixed contact In addition, the second gap is formed between the movable contact carrier and the first restricting portion. As a result, when the plunger is moved by the urging force of the second elastic member and is brought into contact with and stopped from the second restricting portion, the movable contact carrier moved in conjunction with the plunger is further moved by the inertial force acting on itself. The size of the contact gap can be temporarily increased to the first gap + the second gap by moving the second gap. On the other hand, after the movable contact carrier is brought into contact with the first restricting portion, the movable contact carrier is pushed back by the urging force of the first elastic member and comes into contact with the plunger to stop, so that the contact gap becomes the first gap again. That is, the size of the contact gap can be enlarged to the first gap + the second gap while the solenoid portion is maintained in the size corresponding to the first gap.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, the electromagnetic relay by this invention is demonstrated based on drawing. In addition, the same code | symbol is attached | subjected to the same component in each figure.
[0011]
FIG. 1 shows a cross-sectional view at the moment when energization of a coil 15 of an electromagnetic relay 1 according to an embodiment of the present invention is interrupted. FIG. 2 shows a cross-sectional view of the movable contact carrier 5 when the movement of the movable contact carrier 5 is completed by cutting off the energization of the coil 15 of the electromagnetic relay 1 according to the embodiment of the present invention. FIG. 3 shows a cross-sectional view of the electromagnetic relay 1 according to an embodiment of the present invention when the coil 15 is energized.
[0012]
The electromagnetic relay 1 includes a solenoid part K and a switch part W fixed to the upper end of the solenoid part K.
[0013]
The solenoid part K includes a coil 15 that generates a magnetic force when energized, a fixed magnetic path member (a fixed iron core 10, a yoke 13, and a plate 14) and a plunger 9 for converting the magnetic force into an attractive force.
[0014]
Inside the bottomed cylindrical yoke 13, a coil 15 coaxially wound around the bobbin 16 is disposed. A plate 14 is press-fitted into the opening side end of the yoke 13 to hold the bobbin 16. A hole having the same diameter as that of the hole of the bobbin 16 is provided at the bottom of the yoke 13.
[0015]
A fixed iron core 10 made of a cylindrical magnetic material is inserted into the hole of the bobbin 16 until it comes into contact with the bottom of the plate 14 and is fixed to the plate 14 by screwing or welding. A plunger 9 made of a cylindrical magnetic member is fitted over the fixed iron core 10 so as to be slidable in the axial direction.
[0016]
A return spring 11 as a second elastic member is disposed in a compressed state between the fixed iron core 10 and the plunger 9. The return spring 11 moves the plunger 9 away from the fixed iron core 10 (FIG. 1), that is, the movable contact carrier 5 is urged away from the fixed contact carrier 7.
[0017]
A concave portion is formed in the center of the end surface of the plunger 9 on the side opposite to the fixed iron core 10, and a cylindrical shaft 12 made of an electrical insulating material is fitted and fixed. The shaft 12 protrudes upward in the axial direction. The shaft 12 moves integrally with the plunger 9.
[0018]
On the lower end side of the solenoid part K, a bracket 17 for fixing the electromagnetic relay 1 is provided by resin insert molding. A terminal 18 connected to a lead wire (not shown) of the coil 15 is insert-molded in the bracket 17 and a connector 17a is provided. Electric power is supplied to the coil 15 from the outside via the connector 17a.
[0019]
The switch portion W accommodates a movable contact carrier 5 and a pair of fixed contact carriers 7 inside a resin housing 2, and as shown in FIG. 1, the lower end opening of the housing 2 excludes the central portion. And is shielded by a resin insulator 3. A shaft 12 of the solenoid part K projects from the insulator 3 along the axial center at a substantially central position inside the housing 2.
[0020]
A cylindrical stopper 2a, which is a first restricting portion for restricting the movement of the movable contact carrier 5 in the direction away from the fixed contact carrier 7, is suspended from the center of the upper surface of the housing 2 downward in the axial direction. . A contact spring 8 that is a first elastic member is disposed inside the stopper 2a in a compressed state, and the urging force of the contact spring 8 biases the movable contact carrier 5 toward the fixed contact carrier 7. And is in contact with the shaft 12. At this time, a gap C which is a second gap is formed between the stopper 2a and the movable contact carrier 5.
[0021]
The movable contact carrier 5 is made of a good conductor metal, and the movable contacts 4 are fixed to both ends. The movable contact 4 is made of a good conductor metal that is rich in corrosion resistance. That is, the movable contacts 4 at both ends are electrically connected via the movable contact carrier 5.
[0022]
A pair of fixed contact carriers 7 are fixed to the upper surface of the insulator 3 with a shaft 12 therebetween.
[0023]
The fixed contact carrier 7 is made of a good conductor metal, and a fixed contact 6 facing the movable contact 4 with a contact gap G as a first gap is fixed on the upper surface thereof. The solenoid part K described above is set with magnetic characteristics and physique so as to correspond to the contact gap G. The fixed contact 6 is made of a good conductor metal having high corrosion resistance.
[0024]
A stopper 3 a that is a second restricting member is formed at substantially the center of the insulator 3, and restricts the movement of the plunger 9 by the urging force of the return spring 11.
[0025]
The solenoid part K and the switch part W described above are fastened to the yoke 13 by screws (not shown) via the insulator 3 and fixed to the yoke 13 to be integrated to form the electromagnetic relay 1.
[0026]
Next, operation | movement of the electromagnetic relay 1 by one Embodiment of this invention is demonstrated.
[0027]
(1) When the coil 15 is energized When the coil 15 is energized, the coil 15 generates magnetic force, the magnetic circuit comprising the yoke 13, the plate 14, the fixed iron core 10 and the plunger 9 is magnetized, and the plunger 9 is attracted to the fixed iron core 10. The The plunger 9 moves while resisting the urging force of the return spring 11 and comes into contact with the fixed iron core 10 and stops. At this time, the shaft 12 also moves integrally with the plunger 9, and the upper end position of the shaft 12 is lower than the upper surface position of the fixed contact 6 as shown in FIG. In conjunction with the operation of the shaft 12, the movable contact carrier 5 moves in a direction approaching the fixed contact carrier 7 by the urging force of the contact spring 8, and the movable contact 4 contacts the fixed contact 6. Therefore, both the fixed contact carriers 7 are conducted through the movable contact carrier 5 and the electromagnetic relay 1 is closed.
[0028]
(2) When the coil 15 is deenergized When the coil 15 is de-energized, the magnetic force of the coil 15 disappears. Therefore, the plunger 9 moves away from the fixed iron core 10 by the urging force of the return spring 11 (upper side in FIG. 1). That is, the movable contact carrier 5 moves away from the fixed contact carrier 7 and comes into contact with the stopper 3a and stops. The shaft 12 moves integrally with the plunger 9 and pushes the movable contact carrier 5 upward while resisting the urging force of the contact spring 8. Thereby, the movable contact 4 leaves | separates from the fixed contact 6, the conduction | electrical_connection between both the fixed contact support bodies 7 is interrupted | blocked, and the electromagnetic relay 1 will be in an open state. Even when the plunger 9 comes into contact with the stopper 3a and stops, the movable contact carrier 5 moves away from the shaft 12 upward in FIG. 1 due to the inertial force and comes into contact with the stopper 2a. Therefore, the size of the contact gap formed between the movable contact 4 and the fixed contact 6 is temporarily expanded to G + C. With this enlarged contact gap, the arc discharge generated between the two contacts can be quickly extinguished to improve the interruption performance of the electromagnetic relay 1. After the movable contact carrier 5 abuts against the stopper 2a, the movable contact carrier 5 is pushed back downward in FIG. 1 by the urging force of the contact spring 8 to abut against the shaft 12 and stops, and the size of the contact gap becomes G again. Here, the characteristics and shapes of the contact spring 8, the return spring 11 and the movable contact carrier 5 are adjusted, and the time when the contact gap size is G + C is the time until the arc discharge generated between the two contacts disappears. It is set to be sufficiently longer than the time.
[0029]
As described above, in the electromagnetic relay 1 according to the embodiment of the present invention, when the coil 15 is not energized, the plunger 9 comes into contact with the stopper 3a and the contact gap between the fixed contact 6 and the movable contact 4 is large. Then, the movable contact carrier 5 was further moved by the inertial force until it abuts against the stopper 2a, and the size of the contact gap was increased to G + C. Thereafter, the movable contact carrier 5 is pushed back by the urging force of the contact spring 8 and comes into contact with the shaft 12 to stop, and the size of the contact gap becomes G. In other words, while the solenoid part K4 remains in a physique corresponding to the contact gap G, the size of the contact gap during the closing to opening operation of the electromagnetic relay 1 is temporarily expanded to G + C to improve the interruption performance of the electromagnetic relay 1. I was able to.
[0030]
In addition, in the electromagnetic relay 1 of one Embodiment of this invention, although the coil spring is used as the contact spring 8 and the return spring 11, elastic members of other shapes, for example, a leaf | plate spring or a disc spring, etc. are used. Also good.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view at the moment when energization of a coil 15 of an electromagnetic relay 1 according to an embodiment of the present invention is interrupted.
FIG. 2 is a cross-sectional view of the movable contact carrier 5 when the movement of the movable contact carrier 5 is completed when the coil 15 of the electromagnetic relay 1 according to the embodiment of the present invention is turned off.
FIG. 3 is a cross-sectional view of the electromagnetic relay 1 according to an embodiment of the present invention when the coil 15 is energized.
[Explanation of symbols]
1 Electromagnetic relay 2 Housing 2a Stopper (first regulating member)
3 Insulator 3a Stopper (second regulating member)
4 movable contact 5 movable contact carrier 6 fixed contact 7 fixed contact carrier 8 contact spring (first elastic member)
9 Plunger 10 Fixed iron core (fixed magnetic path member)
11 Return spring (second elastic member)
12 Shaft 13 Yoke (fixed magnetic path member)
14 Plate (fixed magnetic path member)
15 Coil 16 Bobbin 17 Bracket 17a Connector 18 Terminal C Gap (second gap)
G Contact gap (first gap)
K Solenoid part W Switch part

Claims (1)

A solenoid unit having a plunger that moves forward and backward in the axial direction by intermittently energizing a coil incorporated therein;
A housing coupled to a fixed magnetic path member of the solenoid part;
Is yield capacity in the housing, and the movable contact carrier shorting capable carrying a pair of movable contacts on both ends as well as forward and backward in the axial direction in conjunction with the plunger,
In the electromagnetic relay having a pair of fixed contacts carrier carrying a pair of fixed contacts which is detachably accommodated with respect to the pair of movable contacts in the housing,
A first elastic member disposed in the housing and biasing the movable contact carrier in a direction approaching the fixed contact carrier;
A second elastic member disposed in the solenoid portion and biasing the plunger in a direction in which the movable contact carrier moves away from the fixed contact carrier;
A first restricting portion that is provided in the housing and restricts movement of the movable contact carrier in a direction away from the fixed contact carrier;
A second restricting portion that is provided at a fixed portion between the housing and the solenoid portion and restricts the movement of the plunger by the urging force of the second elastic member;
The fixed contact carrier, the movable contact carrier, the first elastic member, the second elastic member, the first restricting portion, the second restricting portion, and the plunger are in the forward and backward direction of the plunger, The second elastic member, the plunger, the second restricting portion, the fixed contact carrier, the movable contact carrier, the first elastic member, and the first restricting portion are arranged in this order.
When the plunger comes into contact with the second restricting portion, a first gap is formed between the movable contact and the fixed contact, and between the movable contact carrier and the first restricting portion. A second gap is formed in the electromagnetic relay.

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