JPH09171753A - Electromagnetic contactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To downsize a contact and an operating electromagnet thereby downsizing an electromagnetic contactor so as to save power consumption by applying DC voltage, changing its polarity, to the electromagnetic coil of the operation electromagnet. SOLUTION: One end of the link 18 consisting of right and left arms in a pair is coupled to a mobile contact holder 9 by a pin 19, and the other end of the link 18 is coupled to the operation electromagnet 4 by a pin 20. The operation voltage from the coil terminal part 27 is applied, with normal and reverse alternate polarity, to the electromagnetic coil 26 of the electromagnet 4 through a full wave rectifying circuit 28. Then, an armature 21 lies at one stability point of the electromagnet 4, and for an electromagnetic contactor, the holder 9 is rotated anticlockwise, whereby a contact 5 is opened, and the contactor is turned on. In this condition, a current flows from an input terminal 3 to an output terminal 2 via a fixed contact 16, a fixed contact point 15, a mobile contact point 14, a mobile contactor 5, a fixed conductor 8, and a connection plate 6. Moreover, when the polarity of application voltage to the coil 26 changes, the contact 5 is opened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic contactor which opens and closes a load circuit by operating an electromagnet.

[0002]

2. Description of the Related Art FIG. 5 is a vertical sectional view showing a general structure of a conventional electromagnetic contactor. In the figure, an operating electromagnet is constituted by a fixed iron core 42 to which an electromagnetic coil 41 is attached and a movable iron core 43 arranged so as to face the fixed iron core 42.
A return spring 44 inserted between the electromagnetic coil 41 and the electromagnetic coil 41 keeps the electromagnetic coil 41 in the non-excited state at the illustrated release position. A contact support 45 is connected to the movable iron core 43, and a bridge-type movable contact 47 having movable contacts 46 on both left and right ends is held in a window hole of the contact support 45 together with a contact spring 48 behind it. There is. On the other hand, a pair of left and right fixed contacts 49 and 50 are arranged so as to face both ends of the movable contact 47, a fixed contact 51 for contacting and separating the movable contact 46 is attached to one end thereof, and the other end is an input / output terminal. Terminal screws 52 are provided as parts.

When the electromagnetic coil 41 is excited,
The movable iron core 43 is attracted by the fixed iron core 42 against the return spring 44, and moves toward the right in the figure. As a result, the movable contact 46 contacts the fixed contact 51, and the movable contact 47 bridges between the fixed contacts 49 and 50 to close the input / output terminal portions. After that, when the electromagnetic coil 41 is demagnetized, the movable iron core 43 returns to the position shown by the restoring force of the return spring 44, and the fixed contacts 49 and 50 are opened again.

[0004]

In such a conventional electromagnetic contactor, since the movable contactor is a bridge type, the contact is movable.
There is a problem in that the number of fixed contacts is four and a pair of left and right fixed contacts are required, so that the contact portion becomes large.
Further, since the operating electromagnet operates only by the magnetic attraction force, the electromagnetic coil has to have a large occupied volume and consumes a large amount of power during the closed circuit. The present invention
It is intended to downsize the contact portion and the operating electromagnet, resulting in downsizing of the electromagnetic contactor, and to reduce power consumption.

[0005]

In order to solve the above problems, the present invention according to claim 1 provides a movable contact holder of an insulator rotatably supported by a main body case, and this movable contact holder. A movable contact having a movable contact held at one end and a movable contact attached at the other end, and a pair of left and right contact pieces that make sliding contact with the side surfaces of the movable contact. A fixed conductor that is pressed against the side surface of the movable contact by a compression spring that is inserted between the fixed contact, a connection plate that has one end connected to the fixed conductor and an output terminal portion formed at the other end, and the movable contact at one end. A fixed contact having a fixed contact attached to and separated from the fixed contact, and an input terminal portion formed at the other end;
An operating electromagnet consisting of a rotary drive type bistable electromagnet having two magnetic stable points and a link mechanism connecting the armature of the operating electromagnet and the movable contact holder are provided, and an electric signal from the outside is provided. By alternately changing the polarities of the electromagnetic coils of the operating electromagnet and applying a DC voltage, the armature is rotationally driven between the two stable points to open / close the movable contact. And

According to a second aspect of the present invention, the operating electromagnet is a rotary drive type polar monostable electromagnet having a magnetically stable point and a mechanically stable point due to the restoring force of the return spring, By applying a DC voltage to the electromagnetic coil of the operating electromagnet with an electric signal from the armature, the armature is rotationally driven to the magnetically stable point against the restoring force of the return spring to move the movable contactor. By making a closing operation and releasing the application of the DC voltage, the restoring force of the return spring rotationally drives the armature to the mechanical stable point, thereby causing the movable contactor to be opened. I shall.

According to the above means, the movable contactor is rotated through the movable contactor holder at one end and the movable contact at the other end makes contact with and separates from the fixed contact. Therefore, the contact portion is small. Turn into. Also, in that case, since the electrical connection between the movable contact and the fixed conductor is made by sliding contact instead of by the lead wire, this connection part is also miniaturized, and the lead wire is disconnected or bent due to repeated stress. Variation in switching load due to resistance is eliminated, and operational reliability is improved. On the other hand, by using a polarized bistable electromagnet that uses the holding force of a permanent magnet as the operating electromagnet, it is possible to reduce the size of the electromagnetic coil, and the electromagnetic coil only needs to be temporarily excited during opening and closing operations, so power consumption is also reduced. It can be small.

In the above electromagnetic contactor, the armature of the operating electromagnet and the movable contact holder are detachably connected by fitting the pin and the U-shaped groove, so that the operating electromagnet can be easily replaced and various control voltage specifications can be obtained. Will be able to respond flexibly to.

[0009]

1 is a longitudinal sectional view of an electromagnetic contactor showing an embodiment of the present invention, FIG. 2 (A) is a side view showing a sliding contact portion of a movable contact, and FIG. 2 (B). Is a rear view thereof, and FIG. 3 is an enlarged view of the operating electromagnet in FIG. In FIG. 1, an output terminal portion 2 is arranged on the left side of the mold case 1 and an input terminal portion 3 is arranged on the right side of the molded case 1, and an electric path therebetween is defined by a movable contactor 5 driven by an operating electromagnet 4. It is opened and closed. The output terminal portion 2 is formed at one end of a connection plate 6 made of a rectangular conductor bent in a Z shape, and is provided with a terminal screw 7
Is provided. The fixed conductor 8 is joined to the other end of the connection plate 6 by brazing or screwing, and the movable contact 5
Is adapted to make sliding contact with the fixed conductor 8 at one end thereof.

In FIG. 2, the fixed conductor 8 is formed by a pair of left and right contact pieces 8a made of an elastic conductor whose lower end is joined to the connection plate 6 and is bent in an L shape, and its upper end is a flat movable contact. 5 is sandwiched from both sides at one end (hatched portion in FIG. 2 (A)). On the other hand, the movable contact 5 is held by the movable contact holder 9 (FIG. 1) at this end. That is, the movable contact holder 9 made of mold resin is composed of a rotating shaft 9a extending over each phase and a pair of left and right side walls 9b integrally formed for each phase, as shown in FIG. The movable contact 5 having one end housed between the side walls 9b is
The movable contact holder 9 is rotatably connected to the movable contact holder 9 by a pin 10 penetrating this end and supported at both side walls 9b. Then, between the side wall 9b and the movable contact 5,
A contact spring 11 (FIG. 2A), which is a compression spring for urging the movable contactor 5 in the counterclockwise direction of FIG. 1, is inserted, and the movable contactor 5 is inserted into the stopper portion (not shown) of the side wall 9b by the contact spring 11. The movable contact holder 9 is integrally held by the movable contact holder 9.

Further, in FIG. 2, an elongated hole 12 is provided at a portion where the pin 10 penetrates the fixed conductor 8.
2 (FIG. 2 (A)) has a shape along an arc centered on the rotating shaft 9a of the movable contact holder 9. A compression spring 13 inserted between the side wall 9b and the contact piece 8a of the fixed conductor 8 is fitted on both ends of the pin 10, and the compression spring 13 presses the contact piece 8a against the side surface of the movable contact 5. ing. In FIG. 1 again, a movable contact 14 is attached to the other end of the movable contact 5 whose one end is gripped by the movable contact holder 9, and a fixed contact 15 which comes in contact with and separates from the movable contact 15 is a fixed contact 16 made of a rectangular conductor. It is attached to one end. At the other end of the fixed contactor 16, the input terminal section 3 already described is formed. In addition, surrounding the opening / closing path of the movable contact 14,
An arc extinguishing chamber 17 is arranged.

In FIG. 1, one end of a link 18 consisting of a pair of left and right arms is connected to a movable contact holder 9 by a pin 19, and the other end of the link 18 is connected to an operating electromagnet 4 by a pin 20. Here, the operating electromagnet 4 is composed of a rotary drive type polarized bistable electromagnet. As this polarized bistable electromagnet, any known structure can be used, but here, the one disclosed in Japanese Patent Application Laid-Open No. 7-284262 filed by the present applicant is used. That is, in FIG. 3, a permanent magnet 24 is provided between the outer yoke 22 and the inner yoke 23 on both upper and lower sides of the armature 21 in the drawing.
Two sets of laminated bodies sandwiching each other are arranged on the left and right, and an electromagnetic coil 26 is wound around the outside of the rotation center 25 of the armature 21. An operating voltage from the coil terminal portion 27 (FIG. 1) is applied to the electromagnetic coil 26 via the full-wave rectifier circuit 28 in alternating forward and reverse polarities.

Each of the outer yoke 22, the inner yoke 23 and the permanent magnet 24 is a rectangular flat plate that is long in the direction perpendicular to the plane of the drawing of FIG.
Each of a and 22b is bent in a hook shape so as to project to the left and right opposite sides, that is, to project in an S-shape when viewed two-dimensionally. Similarly, the inner yoke 23 is also provided with the armature portions 23a and 23b on the opposite sides of the inner yoke 23.
When the outer yoke 22 and the inner yoke 23 are bent in a hook shape and the outer yoke 22 and the inner yoke 23 are laminated, that is, when the outer yoke 22 and the inner yoke 23 are laminated,
The bent portions 2b, 23a, and 23b are formed so as to be located at the four corners.

On the other hand, the armature 21 is also a strip-shaped flat plate which is long in the direction perpendicular to the paper surface of FIG. 3, and suction portions 21a and 21b are formed on both left and right sides of both ends in the longitudinal direction thereof. A shaft piece 21c is formed at both ends of the rotation center 25 so as to project therefrom, and a cylindrical shaft 29 made of a molding resin is fitted in the shaft piece 21c. The armature 21 is rotatably supported by the bearing portion 30a of the electromagnet case 30 via the cylindrical shaft 29. Further, the adsorbing portion 21a has a connecting body 31 made of a mold resin.
Is attached by fitting, and a U-shaped groove 32 is formed in the connecting body 31, and the armature 21 has a U-shaped groove 32.
As shown in FIG. 1, the link 1 is fitted with the pin 20
8 is detachably connected.

Now, assuming that the polarities (N, S) of the permanent magnet 24 are as shown in the figure and the armature 21 is in the position of the bold line, the magnetic flux of the upper permanent magnet 24 in the figure is as shown by the arrow line. , The N pole of the permanent magnet 24 → the contacting portion 22a of the outer yoke 22 → the attracting portion 21a of the armature 21 → the front end of the axis of the armature 21 perpendicular to the plane of the drawing → the rear end of the armature 21 → inner The yoke 23 passes through the route of the armature portion 23a to the south pole of the permanent magnet 24, and the attracting portion 21a is attracted to the armature portions 22a and 23a. Similarly, the magnetic flux of the permanent magnet 24 on the lower side of the drawing is the N pole of the permanent magnet 24 → the contact pole portion 22a of the outer yoke 22 → the armature 21.
Adsorption part 21b of → the above-mentioned front end of the armature 21 →
Similarly, the armature 21 passes through the route of the rear end portion → the contact pole portion 23a of the inner yoke 23 → the S pole of the permanent magnet 24, and the attracting portion 21b is attracted to the contact pole portions 22a and 23a.

That is, in the position indicated by the thick line in FIGS. 1 and 3, the armature 21 is at one stable point of the operating electromagnet 4, and at this time, the electromagnetic contactor of FIG.
Is rotated counterclockwise in the figure to close the movable contactor 5,
The electromagnetic contactor is in a closed state (the detailed structure and operation of the polar electromagnet 4 are described in the specification and drawings of JP-A-7-284262). In this state, the movable contactor 5 is in a state of being slightly pushed back clockwise against the movable contactor holder 9 against the contact spring 11, and the reaction force causes the movable contact 14 to have an appropriate contact pressure. Fixed contact 15
Is pressed. In this state, a current flows from the input terminal portion 3 to the output terminal portion 2 through the fixed contact 16, fixed contact 15, movable contact 14, movable contact 5, movable conductor 6, and connecting plate 8.

In the closed state of FIG. 1, the electromagnetic coil 26
Is applied with an operating voltage from the full-wave rectifier circuit 28 to cancel the magnetic flux of the permanent magnet 4 passing through the armature 21 in the axial direction (from the front end to the rear end), that is, the armature 21 is moved to the rear end. When a magnetic flux is generated in a direction passing from the front end to the front end, the attractive force due to the magnetic flux exceeds the attractive force by the permanent magnet 24, and the armature 21 is driven counterclockwise as shown by the arrow in FIG. The attracting portion 21a is attracted to the lower contact portions 22b and 23b in FIG. 3, and the attracting portion 21b is attracted to the upper contact portions 22b and 23b. When the operating voltage is released at this point, the armature 21 is again attracted and held by the magnetic flux of the permanent magnet 24 in the same state, that is, at the other stable point of the operating electromagnet 4. As a result, the movable contact holder 9 is driven clockwise, and the movable contact holder 9 is opened at the position indicated by the thin line in FIG. 1 to put the electromagnetic contactor in the released state.

At this time, the action of the magnetic flux of the permanent magnet 24 is substantially the same as that of the previous case, but the description is omitted. In the released state of FIG. 1, the armature 21 shown by the thin line is stopped by coming into contact with a stopper (not shown) before being attracted to the yokes 22 and 23. This is for facilitating the activation of the armature 21 at the time of insertion.

FIG. 4 is a longitudinal sectional view showing an embodiment of an electromagnetic contactor using a polarized monostable electromagnet as the operating electromagnet 4. 4, the operation electromagnet 4 of the polarized monostable electromagnet is different from that of FIG. 3 in that the outer yoke 22 and the inner yoke 2 are different from each other.
The armature portions 22a and 23a of No. 3 are formed in a hook shape similar to the bistable type to form magnetic stable points, but the armature portions 22b and 23b are formed to form mechanical stable points. It is formed upright and the contact pole area is reduced. A return spring 33, which is a tension spring, is provided between the pin 20 that connects the armature 21 and the link 18 and the molded case 1.
The armature 21 is biased counterclockwise in the figure.

In FIG. 4, when the electromagnetic coil 26 is in the non-excited state, the armature 21 receives the force of the return spring 33 and is held at the fine line position, that is, at the mechanical stable point, and the electromagnetic contactor is in the released state. Even in this state, the armature 21 is stopped by a stopper (not shown) before being attracted to the armature portions 22b and 23b. here,
When a control voltage is applied to the electromagnetic coil 26 via the full-wave rectifier circuit 28 to generate magnetic flux so that the axial direction of the armature 21 goes from the front side to the rear side, the magnetic fluxes of both the permanent magnet 24 and the electromagnetic coil 26 are generated. The attraction force based on the return spring 3
3, the armature 21 is driven in the clockwise direction to be attracted to the armature portions 22a and 23a, and is held at the thick line position which is the magnetic stable point. Along with this, the movable contact 5 is driven counterclockwise, and the electromagnetic contactor is turned on. After that, when the excitation of the electromagnetic coil 26 is released, the armature 21 returns to the mechanical stable point by the action of the return spring 33, and the electromagnetic contactor is released.

[0021]

EFFECTS OF THE INVENTION According to the present invention, the following effects can be obtained from the above-mentioned points. (1) By adopting the one-point cutting method for the contact portion, only one movable and one fixed contact is required, and the contactor structure is obtained. Contact reliability is improved as the size is reduced. Further, in that case, by adopting a sliding contact method for connecting the movable contact and the fixed conductor,
Unlike the lead wire system, there is no disconnection or load resistance variation, and the operating characteristics are stable. (2) Since the operating electromagnet is a polarized electromagnet that uses the attractive force of a permanent magnet, the size of the electromagnetic coil is reduced, and especially for the bistable type, it is only necessary to temporarily excite when opening / closing. Therefore, power consumption is saved. (3) Since the operation electromagnet and the link mechanism can be connected and detached by fitting the pin and the U-shaped groove, the operation electromagnet can be easily replaced when the specifications are changed.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of an electromagnetic contactor showing an embodiment of the present invention.

2A and 2B are diagrams illustrating sliding contact between a movable contactor and a fixed conductor in FIG. 1, in which FIG. 2A is a side view and FIG. 2B is a rear view.

FIG. 3 is an enlarged side view of the bistable polar magnetic contactor in FIG. 1.

FIG. 4 is a vertical sectional view of an electromagnetic contactor showing a different embodiment of the present invention.

FIG. 5 is a vertical sectional view showing a conventional electromagnetic contactor.

[Explanation of symbols]

 2 output terminal part 3 input terminal part 4 operation electromagnet 5 movable contact 6 connection plate 8 fixed conductor 9 movable contact holder 11 contact spring 13 compression spring 16 fixed contact 18 link 20 pin 21 armature 22 outer yoke 23 inner yoke 24 permanent Magnet 26 Electromagnetic coil 28 Full wave rectifier circuit 32 U-shaped groove 33 Return spring

Claims (3)

[Claims] 1. A movable contact holder of an insulator, which is rotatably supported by a main body case, a movable contact held by one end of the movable contact holder, and a movable contact attached to the other end of the movable contact holder. It has a pair of left and right contact pieces that make sliding contact with the side surfaces of the movable contact, and the contact pieces are a fixed conductor that is pressed against the side surfaces of the movable contact by a compression spring inserted between the movable contact holder and the movable contact holder. A fixed plate having one end connected to the fixed conductor and the other end having a connection terminal formed with an output terminal, and one end having a fixed contact for contacting and separating from the movable contact and the other end having an input terminal formed. A contact, an operating electromagnet consisting of a rotary drive type bistable electromagnet having two magnetically stable points, and a link mechanism connecting the armature of the operating electromagnet and the movable contact holder are provided. The electrical signal from the outside By alternately changing the polarity of the electromagnetic coil of the electromagnet and applying a DC voltage, the armature is rotationally driven between the two stable points, and the movable contact is opened and closed. And an electromagnetic contactor. 2. An operating electromagnet is a rotary drive type polar monostable electromagnet having a magnetically stable point and a mechanically stable point due to the restoring force of a return spring, and the operating electromagnet is driven by an external electric signal. By applying a DC voltage to the electromagnetic coil,
By rotationally driving the armature to the magnetic stable point against the restoring force of the return spring, the movable contact is closed, and the application of the DC voltage is released.
The electromagnetic contactor according to claim 1, wherein the armature is rotationally driven to the mechanical stable point by the restoring force of the return spring to cause the movable contactor to open and close. 3. The electromagnetic contactor according to claim 1, wherein the armature of the operating electromagnet and the link mechanism are detachably connected by fitting a pin and a U-shaped groove.