JP3540910B2 - Electromagnetic contactor - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electromagnetic contactor having a hinge-shaped movable iron piece for opening and closing a motor and the like, and in particular, an electromagnetic contactor in which the movable iron piece is unlikely to come off from a bobbin during assembling and generates less noise when the movable iron piece is inserted. About.
[0002]
[Prior art]
FIG. 10 is a partially crushed side view showing a configuration of a conventional electromagnetic contactor, in which the side walls of the upper case 1 and the lower case 7 are crushed to see the inside. Inside the lower case 7, a fixed iron core 11 formed in an E shape is housed. The fixed iron core 11 includes both legs 11A and 11D, a center leg 11C, and a yoke 11B that joins the lower ends of these three legs 11A, 11C and 11D. The yoke 11B is mounted on a step 7B formed on the bottom 7A of the lower case 7. A winding frame 12, which will be described later, goes around the center leg 11C, and collar portions 12A and 12C are provided at both ends thereof. A coil 16 is wound around the winding frame 12. The upper case 1 is connected to the upper part of the lower case 7, and the contact support 2 is placed on the insulating plate 6 fixed to the upper case 1 so as to be movable left and right.
[0003]
Further, the movable iron piece 8 is provided with two arms 8A and 8B extending in a V-shape from a shaft portion 9 serving as a fulcrum. The shaft portion 9 is arranged above one leg 11 </ b> D of both legs, and is fitted in a groove of the bearing 10. The bearing 10 is provided at the right end of the collar portion 12A of the bobbin 12, and supports the shaft portion 9 so as to be freely rotatable. One arm 8A of the movable iron piece 8 is disposed in a space 20 between the insulating plate 6 and the fixed iron core 11. The other arm 8 </ b> A of the movable iron piece 8 extends into the upper case 1 and is in contact with the contact support 2. A movable contact 3 </ b> A is attached to the contact support 2 via a contact spring 5, and a return spring 4 is interposed between the contact support 2 and the upper case 1. Further, a fixed contact 3B is disposed to face the left side of the movable contact 3A and is fixed to the upper case 1 side.
[0004]
FIG. 10 shows a state where the electromagnetic contactor is not excited. In FIG. 10, when the coil 16 is excited, the arm 8B of the movable iron piece 8 is attracted to the fixed iron core 11 and rotates counterclockwise, so that the arm 8A also rotates counterclockwise to move the contact support 2 to the left. Move to the direction. Thereby, the movable contact 3A comes into contact with the fixed contact 3B, and the main circuit is closed. The contact spring 5 constantly urges the movable contact 3A to the left to maintain good contact between the contacts. When the excitation of the coil 16 is stopped, the attracting force of the fixed iron core 11 disappears, so that the return spring 4 moves the contact support 2 to the right. Thereby, the movable iron piece 8 rotates clockwise, and the movable contact 3A and the fixed contact 3B are separated (in the case of the A contact). Some of the contacts are such that the movable contact 3A and the fixed contact 3B are separated from each other by the excitation of the coil and come into contact with each other by the interruption of the excitation of the coil (in the case of the B contact).
[0005]
FIG. 11 is a side view of a part of the main part of the crusher, showing a state at the moment when the coil of the electromagnetic contactor of FIG. 10 is excited. The arm 8B of the movable iron piece 8 is attracted to the fixed iron core 11, and comes into contact with the upper ends of the legs 11A and the center leg 11C. The impact at that time causes the arm 8B of the movable iron piece 8 to slightly tilt further counterclockwise from the horizontal direction, and the entire fixed iron core 11 also momentarily slightly tilts counterclockwise. At this time, the fixed iron core 11 is tilted counterclockwise about the step 7B formed on the bottom 7A of the lower case 7 so that the left end of the yoke 11B is in contact with the bottom 7A. The contact support 2 is pushed leftward by the amount of the inclination, and the contact spring 5 and the return 4 shown in FIG. 10 absorb the collision energy. The arm 8B of the movable iron piece 8 and the yoke 11B of the fixed iron core 11 immediately return to a horizontal state after being attracted.
[0006]
FIG. 12 is a side view showing the configuration of the winding frame 12 of the electromagnetic contactor of FIG. The winding frame 12 includes a cylindrical portion 12B and upper and lower ends of flanges 12A and 12B, and a bearing 10 is formed at the right end of the upper flange 12A. The bearing 10 has a U-shaped groove 10A with the opening facing upward. The groove 10A becomes a fulcrum of hinge operation of the movable iron piece 8 when the shaft 9 of the movable iron piece 8 shown in FIG.
[0007]
FIG. 13 is a view taken in the direction of the arrow A in FIG. The bearings 10 of the winding frame 12 are arranged at two places, and a movable iron piece 8 (not shown) is interposed between the bearings 10.
[0008]
[Problems to be solved by the invention]
However, the conventional device as described above has a problem that the movable iron piece tends to come off during assembly. Also, there is a problem that noise when exciting the coil is large.
FIG. 14 is a side view showing a state where the movable iron piece 8 of the electromagnetic contactor of FIG. Since there is no obstacle in the direction B in the groove 10A of the bearing 10, when the movable iron piece 8 once fitted in the groove 10A during the assembly is moved in the direction B or the winding frame 12 is turned upside down, The iron piece 8 easily comes off the bearing 10. For this reason, conventionally, a large amount of useless time has occurred in which the movable iron piece 8 comes off the bearing 10 during assembly.
[0009]
In FIG. 11, at the moment when the coil 16 is excited, as described above, the arm 8B and the yoke 11C slightly tilt in the counterclockwise direction from the horizontal direction. Therefore, unless the gap 13 between the cylindrical portion 12B and the center leg 11C and the gap 14 between the arm 8B and the collar portion 12A are previously enlarged, the gaps 13 and 14 disappear, and the reel 12 is broken. I will. If the gaps 13 and 14 are large, the bobbin 12 itself is large, and the bobbin 12 vibrates at the moment when the movable iron piece 8 is attracted to the fixed iron core 11, generating a large noise. In order to improve the environment around the electromagnetic contactor, it is necessary to reduce noise due to vibration.
[0010]
An object of the present invention is to make it difficult for a movable iron piece to be detached from a bearing during assembly and to reduce noise when exciting a coil.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, a fixed core having an E-shape and a yoke mounted on the bottom of a lower case, and a cylindrical portion surrounding a central leg of the fixed core have upper and lower ends. of the flange portion is bobbin provided, a coil winding the spool, co opening upward together with the provided above the flange portion of one leg of each side leg of the fixed iron core of the winding frame a bearing having a shaped groove is constituted by a hinged armature having a shaft portion fitted into the groove, from the fixed contact and the movable contact by the movable iron piece to work rotating the shaft portion as a fulcrum In the electromagnetic contactor for contacting and separating the contact part , the groove of the bearing provided in the reel has an opening having a size into which the shaft of the movable iron piece is inserted from above the reel housed in the lower case. and the shaft portion in the axial direction of the movable iron piece of the cylindrical portion of the bobbin to the top of the groove And to form a protrusion that prevents les. Since the protrusion is in the way, the movable iron piece does not easily come off the groove during assembly.
[0012]
A fixed core having an E-shape and a yoke placed on the bottom of the lower case; a bobbin provided with upper and lower ends on a cylindrical portion surrounding a central leg of the fixed core; A coil for winding a winding frame, a bearing provided on the upper part of one of the two legs of the fixed iron core and having a groove that opens upward, and a hinge type movable iron piece having a shaft that fits into the groove. In the electromagnetic contactor configured to move and separate a contact portion composed of a fixed contact and a movable contact by rotating the movable iron piece around the shaft portion as a fulcrum, the electromagnetic contactor in the other leg side of the fixed iron core of the cylindrical portion wall with inclined to the other leg of the fixed iron core toward the upward, the bottom side of the lower case according to the upper surface of the other leg side of the fixed iron core of the upper flange portion goes to the other leg of the fixed iron core It may also be inclined. Thereby, when the coil is not excited, the gap between the cylindrical portion of the bobbin and the center leg becomes wider as going upward. On the other hand, the gap between one arm of the movable iron core and the collar part also becomes wider toward the other leg side of the fixed iron core . At the moment when the coil is excited, the above gaps are only narrowed by the movable iron piece and the inclination of the fixed iron core, respectively, so that the lower root of the cylindrical portion and the root of the upper collar portion are respectively set to the center leg and the movable iron piece. Can be closer to one arm. Thereby, the backlash of the bobbin is reduced, so that the noise is reduced.
[0013]
Further, in such a configuration, an insulating plate for insulating the contact portion and the coil from each other may be integrally formed on the winding frame. Thereby, the number of parts is reduced.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described based on examples. FIG. 1 is a partially broken side view showing the configuration of an electromagnetic contactor according to an embodiment of the present invention. The only difference from the conventional electromagnetic contactor of FIG. 10 is the configuration of the bobbin 26 and the bearing 15. Other configurations are the same as those of the conventional configuration, and the same portions are denoted by the same reference characters, and detailed description thereof will not be repeated below.
[0015]
2 and 3 are a side view and a plan view, respectively, showing the configuration of the bobbin 26 of the electromagnetic contactor of FIG. Each of the two bearings 15 has a projection 15B on the top of the groove 15A. As shown in FIG. 1, the shaft 9 of the movable iron piece 8 is fitted into the groove 15A. The movable iron piece 8 cannot move in the vertical direction and is hard to come off the bearing 15 because the protrusion 15B interferes. Although the protrusion 15B is formed in an L-shape in FIG. 2, the shape of the protrusion 15B is arbitrary and may be any as long as it protrudes above the groove 15A.
[0016]
FIGS. 4 and 5 are a side view and a plan view, respectively, showing a state in which the movable iron piece 8 is being assembled into the winding frame 26 of FIG. One arm 8B of the movable iron piece 8 is inclined, and the shaft 9 is fitted into the groove 15A from an oblique direction (D direction). Conversely, the movable iron piece 8 can be detached from the bearing 15 only in the direction D. Therefore, even if the movable iron piece 8 is pulled upward during the assembling or the winding frame 26 is inverted, the movable iron piece 8 does not come off the bearing 15.
[0017]
Returning to FIG. 2, the inner wall surface 26E on the left side (opposite the bearing 15 side) of the cylindrical portion 26B of the winding frame 26 is slightly inclined leftward (opposite the bearing 15 side) as going upward. The upper surface 26D on the left side (opposite the bearing 15 side) of the upper flange 26A is slightly inclined downward (bottom side of the lower case) toward the left side (opposite the bearing 15 side).
FIG. 6 is a sectional view of a main part of FIG. This figure shows a state in which the electromagnetic contactor is not excited, and the gap 30 between the inner wall surface 26E and the center leg 11C increases as going upward. Reference numeral 11E denotes a shading coil, which is disposed on each of the upper end surfaces of both side legs 11A and 11D so as to prevent the electromagnetic contactor from beating.
[0018]
FIG. 7 is a cross-sectional view of a main part showing a state at the moment when the coil 16 of the electromagnetic contactor of FIG. 6 is excited. The arm 8B of the movable iron piece 8 is attracted to the fixed iron core 11 and contacts the upper ends of the legs 11A and the center leg 11C of the fixed iron core 11. The impact at that time causes the arm 8B of the movable iron piece 8 to slightly tilt in the counterclockwise direction from the horizontal direction, and the entire fixed iron core 11 also momentarily slightly tilts in the counterclockwise direction. At this time, the fixed iron core 11 is tilted counterclockwise about the step 7B formed on the bottom 7A of the lower case 7 so that the left end of the yoke 11B is in contact with the bottom 7A. This movement is exactly the same as the conventional electromagnetic contactor described above.
[0019]
In FIG. 7, the gap 30 existing in the state of FIG. 6 is almost eliminated. Further, the gap 31 between the upper surface 26D and the arm 8B is almost eliminated. That is, the gaps 30, 31 are smaller than the conventional gaps 14, 13 in FIG. The inclination between the inner wall surface 26E and the upper surface 26D in FIG. 6 is adjusted to the angle at which the fixed iron core 11 is inclined at the moment when the movable iron piece 8 is attracted to the fixed iron core 11. This is why the gaps 30 and 31 are almost eliminated, and the fixed iron core 11 and the movable iron piece 8 do not crush the winding frame 26. By making the inner wall surface 26E and the upper surface 26D inclined, the winding frame 26 has almost no gap with respect to the movable iron piece 8 and the fixed iron core 11 in the state of FIG. As a result, the play around the winding frame 26 is reduced, the vibration of the winding frame 26 is reduced, and the noise when the coil is excited is reduced.
[0020]
FIG. 8 is a side view showing a configuration of a bobbin of an electromagnetic contactor according to another embodiment of the present invention, and FIG. 9 is a view taken in the direction of arrow C in FIG. The winding frame 26 and the upper insulating plate 6 are integrated via four support columns 19 at four corners. Other configurations are the same as those in FIG. Thereby, the number of parts of the electromagnetic contactor is reduced, and the cost is reduced.
[0021]
【The invention's effect】
According to the present invention, as described above, since the protrusion is formed on the upper portion of the groove of the bearing, the movable iron piece does not easily come off the groove during assembly, and waste time during assembly can be reduced.
In this configuration, the inner wall surface on the other leg side of the fixed iron core of the bobbin cylinder and the upper surface of the other leg side of the fixed iron core of the upper collar portion of the bobbin are inclined. Thereby, noise at the time of exciting the coil is reduced, and the environment around the electromagnetic contactor is improved. The name change notification has been submitted on October 2.
[0022]
Further, in such a configuration, since the insulating plate is formed integrally with the winding frame, the number of components is reduced, and the cost is reduced.
[Brief description of the drawings]
FIG. 1 is a partially broken side view showing a configuration of an electromagnetic contactor according to an embodiment of the present invention. FIG. 2 is a side view showing a configuration of a bobbin of the electromagnetic contactor of FIG. 1. FIG. FIG. 4 is a plan view showing the configuration of the winding frame of the contactor. FIG. 4 is a side view showing a state in which the movable iron piece is being assembled into the winding frame of FIG. 2; FIG. 6 is a cross-sectional view of a main part of FIG. 1. FIG. 7 is a cross-sectional view of a main part showing a state at the moment when a coil of the electromagnetic contactor of FIG. 6 is excited. FIG. 9 is a side view showing the configuration of the winding frame of the electromagnetic contactor. FIG. 9 is a view taken in the direction of arrow C in FIG. 8. FIG. 10 is a partially broken side view showing the configuration of a conventional electromagnetic contactor. FIG. 12 is a side view of a part of the main part of the crusher showing the state at the moment when the coil of the contactor is excited. 3] A view on arrow of FIG. 12 and FIG. 14 is a side view of the movable iron piece of the electromagnetic contactor of Fig. 10 shows a state that deviates from reel EXPLANATION OF REFERENCE NUMERALS
1: upper case, 2: contact support, 3A: movable contact, 3B: fixed contact, 4: return spring, 5: contact spring, 6: insulating plate, 7: lower case, 7A: bottom, 7B: step, 8: Movable iron piece, 8A, 8B: arm, 9: shaft, 10, 15: bearing, 15A: groove, 15B: protrusion, 11: fixed core, 11A, 11D: both legs, 11C: center leg, 11B: yoke, 12, 26: reel, 26A, 26C, 12A, 12C: collar, 26B, 12B: tubular, 26D: upper surface, 26E: inner wall, 13, 14, 30, 31: gap, 16: coil, 19: Support column coil, 20: space

Claims (3)

A fixed core having an E-shape and a yoke mounted on the bottom of the lower case; a bobbin provided with upper and lower ends of a cylindrical portion surrounding a central leg of the fixed core; And a bearing provided with a U-shaped groove that is provided above the collar portion on one leg side of both legs of the fixed iron core of the winding frame and that opens upward, and is fitted in the groove. An electromagnetic contactor that is configured by a hinge-type movable iron piece having a shaft part to be joined, and the movable iron piece rotates around the shaft part to make contact / separate a contact part consisting of a fixed contact and a movable contact . groove of the bearing provided in the frame has a size of opening of the shaft portion of the movable iron piece from above of the bobbin housed in the lower case is inserted, and the axis of the cylindrical portion of the bobbin to the top of the groove It is characterized by the formation of the projecting portion for preventing disengagement of the shaft portion in the direction of the movable iron piece Electromagnetic contactor. A fixed core having an E-shape and a yoke mounted on the bottom of the lower case; a bobbin provided with upper and lower ends of a cylindrical portion surrounding a central leg of the fixed core; And a bearing provided on the upper part of one of the two legs of the fixed iron core and having a groove that opens upward, and a hinge-type movable iron piece having a shaft that fits into the groove. In the electromagnetic contactor that contacts and separates a contact portion consisting of a fixed contact and a movable contact by rotating the movable iron piece with the shaft portion as a fulcrum, the inner wall surface of the cylindrical portion on the other leg side of the fixed iron core is with inclined toward upward to the other leg of the fixed iron core, inclined to the bottom side of the lower case according to the upper surface of the other leg side of the fixed iron core of the upper flange portion goes to the other leg of the fixed iron core Electromagnetic contactor characterized by comprising 3. The electromagnetic contactor according to claim 1, wherein an insulating plate that insulates between the contact portion and the coil is integrally formed on the winding frame. 4.

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