JP2022112552A - magnetic contactor - Google Patents

Abstract

To suppress magnetic interference with a plunger in a magnetic contactor.SOLUTION: A magnetic contactor includes a contact portion 21 arranged on one side in a predetermined axial direction and operating along the axial direction to open and close an electrical path of a circuit, and an electromagnet portion 22 arranged on the other side in the axial direction and switching between opening and closing of the contact portion 21. The electromagnet portion 22 has a plunger 52 that opens and closes the contact portion 21 by displacement in the axial direction, and the plunger 52 is provided with a flange 66 that is attracted by excitation on the other side in the axial direction.SELECTED DRAWING: Figure 2

Description

The present invention relates to an electromagnetic contactor.

In the electromagnetic contactor shown in Cited Document 1, a pair of permanent magnets are provided so as to face each other across the contact portion. Magnetic drive of the permanent magnets extends the arc when opening the contact portion, and the arc voltage , the breaking performance of the contact is improved. Further, the electromagnet section is configured to close the contact section when the flange of the plunger is attracted to the yoke.

JP 2016-134308 A

When the flange of the plunger is arranged near the contact portion, there is a concern that the operation of the plunger may be affected by magnetic interference.
An object of the present invention is to suppress magnetic interference with a plunger in an electromagnetic contactor.

An electromagnetic contactor according to an aspect of the present invention is arranged on one side in a predetermined axial direction, and is arranged on the other side in the axial direction with a contact portion that opens and closes an electric circuit of a circuit by operating along the axial direction. an electromagnet for switching between opening and closing of the contact, the electromagnet having a plunger for opening and closing the contact by displacement in the axial direction, and the plunger having a flange attracted by excitation provided on the other side in the axial direction. It is

An electromagnetic contactor according to another aspect of the present invention is arranged on one side in a predetermined axial direction, and has a contact portion that opens and closes an electric circuit of a circuit by operating along the axial direction, and a contact portion on the other side in the axial direction. and an electromagnet portion arranged to switch between opening and closing of the contact portion, and a sealed resin container that seals the contact portion and the electromagnet portion and contains a gas for breaking the contact portion. A plunger that opens and closes the contact portion by displacement is provided, and the plunger is provided on the other side in the axial direction with a flange that is attracted by excitation.

According to the present invention, magnetic interference with the plunger can be suppressed by providing the flange of the plunger on the other side in the axial direction, that is, on the side farther from the contact portion.

It is an external view of an airtight container (1st Embodiment). It is a sectional view of an airtight container (a 1st embodiment). FIG. 4 is an external view of a yoke (first embodiment); It is a figure which shows the modification 1-1. It is a figure which shows the modification 1-2. It is sectional drawing of a closed container (2nd Embodiment). FIG. 11 is an external view of a yoke (second embodiment); FIG. 13 is a diagram showing modification 2-1; It is sectional drawing of a closed container (3rd Embodiment). FIG. 11 is an external view of a yoke (third embodiment); It is sectional drawing of an airtight container (4th Embodiment). It is an external view of an airtight container (5th Embodiment). It is sectional drawing of an airtight container (5th Embodiment).

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. Note that each drawing is schematic and may differ from the actual one. Moreover, the following embodiments are intended to exemplify devices and methods for embodying the technical idea of the present invention, and are not intended to limit the configurations to those described below. That is, the technical idea of the present invention can be modified in various ways within the technical scope described in the claims.

<<1st Embodiment>>
"Constitution"
In the following description, the three mutually orthogonal directions are referred to as the vertical direction, the width direction, and the depth direction for convenience. In the description of the axis along the depth direction, the front side in the depth direction is defined as one side in the axial direction, and the back side in the depth direction is defined as the other side in the axial direction.
FIG. 1 is an external view of a sealed container (first embodiment).
The sealed container 11 is housed in a case of a sealed electromagnetic contactor (not shown) and used to open and close the electrical path of the circuit. The sealed container 11 is made of electrically insulating resin, and includes a case portion 12 and a bottom portion 13 .
The case portion 12 has a rectangular box shape with the front side in the depth direction, both sides in the vertical direction, and both sides in the width direction closed, and the back side in the depth direction opened.
The bottom portion 13 fits into the open end of the case portion 12 and closes the back side of the case portion 12 in the depth direction.

The sealed container 11 is filled with a pressurized shielding gas such as hydrogen or nitrogen. Therefore, the closed container 11 has the case part 12 and the bottom part 13 fixed with an epoxy resin adhesive, and the entire outer peripheral surface including the boundary part is gas barrier coated with a laminated film of clay crystals. Specifically, by substituting the inter-layer ions of refined smectite and connecting them with organic binders such as PVA (polyvinyl alcohol) and water-soluble nylon, a labyrinth effect is expressed and gas molecules such as hydrogen and nitrogen permeate. prevent. The laminated film is laminated in the thickness direction and has a thickness of, for example, 2 μm. The gas barrier coating is completed by, for example, a spray method in which a coating liquid is made into a mist and applied to the sealed container 11, and is baked at a temperature of 150° C. or higher, at which interlayer ions are taken into the clay crystals. In this way, since the gas barrier coating is applied to the entire outer peripheral surface, the outer peripheral shape of the sealed container 11 is preferably a polygon configured by straight planes with as few irregularities as possible.

FIG. 2 is a cross-sectional view of a closed container (first embodiment).
Here, a cross section along the longitudinal and depth directions passing through the center in the width direction is shown.
The closed container 11 accommodates a contact portion 21 and an electromagnet portion 22 . Specifically, the contact portion 21 is arranged on the front side of the closed container 11 in the depth direction, and the electromagnet portion 22 is arranged on the back side of the closed container 11 in the depth direction.
The contact portion 21 is connected to a circuit and opens and closes the electric path of the circuit.

The pair of fixed contacts 31 are made of conductive metal and are arranged vertically with a gap therebetween. The fixed contact 31 has a columnar shape extending in the depth direction, penetrates the ceiling on the front side in the depth direction of the case portion 12, and has an end surface on the front side in the depth direction that is recessed toward the back side in the depth direction. A bottomed screw hole 33 is formed. The fixed contact 31 has a fixed contact 34 formed on the end face on the far side in the depth direction. The pair of fixed contacts 31 are connected to the primary side of the circuit and the other to the secondary side of the circuit by fastening terminal screws to the screw holes 33, respectively.
An insulating wall 14 is formed between the fixed contacts 31 on the outer peripheral surface of the case portion 12 . The insulating wall 14 is located substantially at the center in the vertical direction and is formed in a plate shape extending in the width direction and the depth direction so as to protrude toward the front side in the depth direction. The height of the insulating wall 14 is higher than the fixed contact 31 projecting from the case portion 12 .

The fixed contact 31 is integrated with the case portion 12 by insert molding so as to penetrate the ceiling of the case portion 12 . Specifically, the surface of the stationary contactor 31 is chemically etched to form micron-sized fine irregularities, and then insert molding is performed. As a result, the melted resin enters the concave-convex shape, and the resin solidifies, bonding the metal and resin at the interface level, creating a complex bond due to the labyrinth effect, preventing the leakage of gas molecules such as hydrogen and nitrogen. I'm in. As a metal surface treatment technology, there is, for example, "AMALPHA" (registered trademark) of MEC Co., Ltd.

The movable contact 32 is made of metal having conductivity, extends in the vertical direction, is formed in a plate shape along the vertical direction and the width direction, and is arranged on the far side in the depth direction from the pair of fixed contacts 31 . there is On both end sides of the movable contact 32, movable contacts 35 are formed on surfaces on the front side in the depth direction. The movable contact 32 separates the movable contacts 35 from the fixed contacts 34 when the movable contact 32 is retracted to the depth side, and moves the movable contacts 35 to the front side in the depth direction. are brought into contact with the fixed contact 34 . The contact portion 21 is formed by a fixed contact 34 and a movable contact 35 .

The movable contact 32 is supported by a shaft 41 extending in the depth direction. Specifically, a through hole 42 is formed in the center of the movable contact 32 in the vertical direction and the width direction, and penetrates in the depth direction. A child 32 is supported. A contact spring 43 is inserted through the shaft 41 , and the contact spring 43 keeps the contact pressure of the contact portion 21 constant by urging the movable contact 32 forward in the depth direction. The movable contactor 32 and the contact spring 43 are fixed by a flange provided on the shaft 41 or a retaining ring for the shaft. The shaft 41 is a metal having paramagnetism or diamagnetism without being strongly magnetized.

A partition member 45 is provided around the contact portion 21 in the sealed container 11 . The partition member 45 is made of an electrically insulating resin, and is formed in a container shape surrounding both sides in the vertical direction, both sides in the width direction, and the back side in the depth direction. A through-hole 46 is formed in the back surface of the partition member 45 in the depth direction, and the shaft 41 is inserted therethrough. Plate-shaped permanent magnets 47 (arc-extinguishing permanent magnets) are fitted one by one on both sides of the outer peripheral surface of the partition member 45 in the vertical direction, and a belt-shaped yoke 48 is provided around the permanent magnets 47 . The inner side of the partition member 45 is a contact accommodating portion 49 that accommodates the contact portion 21 . Consumed powder may be generated in the contact housing portion 49 due to the operation of the contact portion 21 . Therefore, it is desirable to reduce the gap between the shaft 41 and the through hole 46 in order to prevent foreign matter such as consumable powder from entering the electromagnet portion 22 side.

The pair of permanent magnets 47 are arranged on the outside of the partition member 45 so as to face each other across the contact portion 21 in the vertical direction. Although the polarity does not matter, here, as an example, they are arranged so that the inner side in the vertical direction becomes the S pole. As a result, in each permanent magnet 47, a magnetic flux is formed that goes from the outer side in the vertical direction to the outer side in the width direction and goes inward in the vertical direction. The yoke 48 is divided into two halves at the center in the vertical direction, each of which is formed in a substantially U-shape that opens inward in the vertical direction when viewed from the depth direction. By fitting them together from both sides, they surround the entire periphery of the partition member 45 as seen from the depth direction. These permanent magnet 47 and yoke 48 extinguish the arc by increasing the arc voltage when opening the contact portion 21 . Therefore, the inside of the partition member 45 becomes an arc-extinguishing space for extending the arc by magnetic drive.

The electromagnet part 22 is accommodated in the back side of the closed container 11 in the depth direction, and switches the opening and closing of the contact part 21 . The polarized electromagnet section 22 includes a spool 51 , a plunger 52 , a yoke 53 , a return spring 54 , a permanent magnet 55 (auxiliary permanent magnet), and an auxiliary yoke 56 .
The spool 51 is made of electrically insulating resin, and has a cylindrical winding shaft 61 (tubular portion) extending in the axial direction. A plunger 52 is inserted inside the winding shaft 61 , and a coil 62 is wound around the outside of the winding shaft 61 .

The plunger 52 is a columnar movable iron core extending in the axial direction, and is inserted into the winding shaft 61 so as to be movable back and forth. A flange 66 protruding radially outward is formed at the other axial end of the plunger 52, and when viewed in the width direction or the lengthwise direction, the plunger 52 has a substantially upside-down T shape. The plunger 52 is made of ferromagnetic metal, and has a flange 66 formed integrally by, for example, machining or forging. The plunger 52 has a circular recess 67 formed at one end in the axial direction and having a circular cross-sectional shape that is recessed toward the other side in the axial direction. The plunger 52 is formed with a threaded hole 68 extending axially through the plunger 52 in the radial center thereof, and the other end of the shaft 41 in the axial direction is fitted into the threaded hole 68 and connected.

The yoke 53 forms a magnetic path when excited by energizing the coil 62 .
FIG. 3 is an external view of a yoke (first embodiment).
(a) in the figure is a perspective view of the yoke 53 viewed from the front side in the depth direction, and (b) in the figure is a perspective view of the yoke 53 viewed from the back side in the depth direction. The yoke 53 is a plate-shaped yoke and includes a pair of side piece portions 71, an upper piece portion 72 (one piece portion), and a lower piece portion 73 (the other piece portion).
The pair of side piece portions 71 are formed in a plate shape along the width direction and the depth direction, and cover both longitudinal outer sides of the spool 51 and the coil 62 (see FIG. 2).

The upper piece portion 72 is formed in a plate shape along the vertical direction and the width direction, and both ends in the vertical direction are connected to the front side of the side piece portion 71 in the depth direction. A circular insertion hole 74 through which the shaft 41 is inserted is formed in the center of the upper piece 72 in the longitudinal and width directions.
The lower piece portion 73 is formed in a plate shape along the vertical direction and the width direction, and both ends in the vertical direction are connected to the deep side of the side piece portion 71 in the depth direction. A circular insertion hole 75 through which the plunger 52 is inserted is formed in the center of the lower piece 73 in the longitudinal and width directions.
The pair of side piece portions 71 and upper piece portion 72 are integrally formed by press working, and when viewed from the width direction, are formed in a substantially U-shape that opens toward the depth side in the depth direction. The lower piece portion 73 is formed by press working as a separate piece.

As shown in FIG. 2, the return spring 54 is sandwiched between the bottom surface of the circular recess 67 and the upper piece 72 while being inserted through the shaft 41, and the plunger 52 is attached to the other side in the axial direction. I am gaining momentum.
The permanent magnet 55 is formed with a circular hole 76 that penetrates in the axial direction and has a larger diameter than the flange 66 . The permanent magnet 55 is attached to the surface of the lower piece 73 on the other side in the axial direction so as to surround the flange 66 on the other side in the axial direction of the lower piece 73 . The thickness of the permanent magnet 55 is the sum of the thickness of the flange 66 and the stroke amount of the plunger 52 . The stroke amount of the plunger 52 corresponds to the separation distance between the flange 66 and the lower piece portion 73 when the flange 66 is attracted to the auxiliary yoke 56 .

The auxiliary yoke 56 is a plate-shaped yoke and is attached to the other axial end surface of the permanent magnet 55 .
When the flange 66 is attracted to the auxiliary yoke 56, the separation distance between the flange 66 and the lower piece portion 73 and the separation distance between one end of the plunger 52 and the upper piece portion 72 are substantially equal. However, the separation distance between the flange 66 and the lower piece portion 73 is less than or equal to the separation distance between one end of the plunger 52 and the upper piece portion 72 . Therefore, when the plunger 52 is displaced to one side in the axial direction, at least the flange 66 and the lower piece portion 73 come into contact with each other.

As described above, when the coil 62 is not energized and in a de-excited state, the magnetic force of the permanent magnet 55 and the repulsive force of the return spring 54 cause the plunger 52 to retreat to the other side in the axial direction, and the flange 66 is attracted to the auxiliary yoke 56 . It is As a result, the shaft 41 is also retracted to the other side in the axial direction, so that the contact portion 21 is opened (released state). At this time, the flange 66 is separated from the lower piece portion 73 and one end of the plunger 52 is separated from the upper piece portion 72 .
When the coil 62 is energized and excited from this state, the flange 66 is attracted to the lower piece 73 and the plunger 52 is attracted to the upper piece 72 . That is, the plunger 52 advances in one axial direction against the magnetic force of the permanent magnet 55 and the repulsive force of the return spring 54, and the shaft 41 accordingly advances in one axial direction. 21 is closed (on state).

《Action》
Next, main effects of the first embodiment will be described.
Until now, only the contact area was sealed, but there were layout restrictions such as having to place the flange of the plunger close to the contact area, and there was room for improvement in terms of design freedom. In addition, since a permanent magnet for extinguishing the arc by magnetic drive is provided on the side near the contact portion, there is concern that if the flange is close to the contact portion, magnetic interference will affect the operation of the plunger. In addition, if the flange is close to the contact portion, there is also the problem that it is susceptible to thermal effects due to the temperature rise at the time of disconnection.

Therefore, in the present embodiment, the contact portion 21 and the electromagnet portion 22 are hermetically sealed with the closed container 11 made of resin. A flange 66 that is attracted by excitation is provided on the other side of the plunger 52 in the axial direction. By sealing the contact portion 21 and the electromagnet portion 22 in the sealed resin container 11 in this manner, the flange 66 of the plunger 52 can be provided on the far side from the contact portion 21 . In other words, layout restrictions can be relaxed, and the degree of freedom in design can be improved. In particular, by arranging the flange 66 of the plunger 52 on the far side from the contact portion 21 , the operation of the plunger 52 is not affected by the magnetic field of the permanent magnet 47 , and the contact portion 21 is less susceptible to heat. Since the flange 66 is formed integrally with the plunger 52, an increase in the number of parts can be suppressed.

A spool 51 of the electromagnet part 22 has a plunger 52 inserted inside a winding shaft 61 and a coil 62 wound around the outside of the winding shaft 61 . The yoke 53 of the electromagnet portion 22 is provided with a pair of side pieces 71 on the outer side in the vertical direction, and an upper piece 72 on one side of the side pieces 71 in the axial direction. A lower piece portion 73 is provided on the other side. When the electromagnet portion 22 is excited by energizing the coil 62, the flange 66 on the other side in the axial direction is attracted by the lower piece portion 73, thereby displacing the plunger 52 to the one side in the axial direction. Thereby, opening and closing of the contact portion 21 can be switched. In addition, since the side piece portion 71, the upper piece portion 72, and the lower piece portion 73 of the yoke 53 each have a simple planar shape, the total cost can be suppressed.

A permanent magnet 55 is attached to the other side of the lower piece 73 in the axial direction, and an auxiliary yoke 56 is attached to the other side of the permanent magnet 55 in the axial direction. As a result, the flange 66 of the plunger 52 is attracted by the auxiliary yoke 56 when the coil 62 is not energized and is not energized. Therefore, even if the contact portion 21 is subjected to an axial impact from the outside, the contact portion 21 can be kept open and released, and the contact portion 21 can be prevented from being erroneously closed and closed. Since malfunction of the contact portion 21 can be suppressed in this way, it is not necessary to limit the mounting direction of the electromagnetic contactor.

A pair of fixed contacts 31 are arranged with a gap inside the sealed container 11 , fixed contacts 34 are formed on one end side of each, and the other ends of the fixed contacts 31 are connected to a circuit outside the sealed container 11 . The movable contactor 32 has movable contacts 35 formed on both end sides, and makes the movable contacts 35 contact and separate from the fixed contacts 34 respectively. The contact portion 21 is formed by a fixed contact 34 and a movable contact 35 . The shaft 41 extends in the axial direction and has one side connected to the movable contact 32 and the other side connected to the plunger 52 . Thereby, opening and closing of the contact portion 21 can be switched in conjunction with the operation of the plunger 52 . The fixed contact 31 has a columnar shape extending in the depth direction, penetrates the ceiling on the front side in the depth direction of the case portion 12, and is formed with a screw hole 33 along the axial direction. Therefore, it is possible to ensure high strength in the tightening direction of the terminal screw and to reduce the vertical dimension of the product.

The yoke 53 has a side piece portion 71 and a lower piece portion 73 that are formed separately. Thereby, the lower piece portion 73 can be formed from a single plate, and the flatness and the parallelism with the flange 66 can be improved. Therefore, contact with the flange 66 can be stabilized.
Permanent magnets 47 facing each other across the contact portion 21 in a direction orthogonal to the axial direction are provided to extinguish an arc when the contact portion 21 is opened. By magnetically driving the pair of permanent magnets 47, the arc is extended inside the partition member 45, and the arc voltage is increased, thereby enhancing the breaking performance.
The sealed container 11 is gas-barrier-coated with a laminated film of clay crystals. As a result, permeation of gas molecules such as hydrogen and nitrogen is suppressed, and leakage of the pressurized shielding gas can be prevented.

<<Modification 1-1>>
In the first embodiment, the pair of side piece portions 71 and upper piece portion 72 are integrally molded, and only the lower piece portion 73 is separately molded, thereby dividing the yoke 53 in the axial direction. It is not limited. For example, the yoke 53 may be divided in a direction orthogonal to the axial direction and molded separately.
FIG. 4 is a diagram showing Modification 1-1.
(a) in the figure is a perspective view of the yoke 53 viewed from the front side in the depth direction, and (b) in the figure is a perspective view of the yoke 53 viewed from the back side in the depth direction. Here, each of the upper piece portion 72 and the lower piece portion 73 is vertically divided by a center line along the width direction.

The upper piece portion 72 is divided into one upper piece portion 72a and the other upper piece portion 72b. One of the upper pieces 72a has a vertical outer side connected to the front side in the depth direction of the side piece 71a, and a semicircular insertion groove 74a is formed in the vertical inner edge. . The other upper piece portion 72b has a vertical outer side connected to the front side in the depth direction of the side piece portion 71b, and a semicircular insertion groove 74b is formed in the vertical inner edge portion. . The pair of insertion grooves 74a and 74b are circular insertion holes that face each other and through which the shaft 41 is inserted.

The lower piece portion 73 is divided into one lower piece portion 73a and the other lower piece portion 73b. One of the lower pieces 73a has a vertical outer side connected to the deep side of the side piece 71a in the depth direction, and a semicircular insertion groove 75a is formed in the vertical inner edge. . The other lower piece 73b has a vertical outer side connected to the deep side of the side piece 71b in the depth direction, and a semicircular insertion groove 75b is formed in the vertical inner edge. . The pair of insertion grooves 75a and 75b are circular insertion holes that face each other and through which the plunger 52 is inserted.

On one side in the vertical direction, the side piece portion 71a, the upper piece portion 72a, and the lower piece portion 73a are integrally formed by press working, and when viewed from the width direction, it has a substantially U-shape that opens inward in the vertical direction. formed. On the other side in the vertical direction, the side piece portion 71b, the upper piece portion 72b, and the lower piece portion 73b are integrally formed by press working, and when viewed from the width direction, have a substantially U-shape that opens inward in the vertical direction. formed. In this way, by dividing the yoke 53 in the direction orthogonal to the axial direction, that is, in the vertical direction and separately molding them, it is possible to assemble them at low cost, and the total cost can be suppressed.

<<Modification 1-2>>
Although the configuration in which the plunger 52 and the flange 66 are integrally molded has been described in the first embodiment, the configuration is not limited to this, and the plunger 52 and the flange 66 may be molded separately.
FIG. 5 is a diagram showing Modification 1-2.
The flange 66 is formed in a disc shape having a through hole and is fixed to the other end side of the plunger 52 by caulking or by a retaining ring for a shaft. By forming the columnar plunger 52 and the disk-shaped flange 66 separately in this way, both of them have a simple shape, so that they are easy to form, and the total cost can be suppressed.

<<Other Modifications>>
In the first embodiment, the gas barrier coating is applied only to the outer peripheral surface of the sealed container 11, but the gas barrier coating is not limited to this, and the gas barrier coating may be applied to the inner peripheral surface of the sealed container 11 as well.
In the first embodiment, the polarized electromagnet section 22 including the permanent magnet 55 and the auxiliary yoke 56 has been described, but the present invention is not limited to this. In other words, the non-polar electromagnet section 22 may be configured without the permanent magnet 55 and the auxiliary yoke 56 .
In the first embodiment, a sealed electromagnetic contactor in which the contact portion 21 is housed in the sealed container 11 and the shutoff gas is enclosed has been described. may apply.

<<Second embodiment>>
"Constitution"
2nd Embodiment changes the form of the upper piece part 72 in the electromagnet part 22, Since it is the same as that of 1st Embodiment mentioned above other than that, the same code|symbol is attached|subjected about a common structure, Description is omitted.
FIG. 6 is a cross-sectional view of a closed container (second embodiment).
FIG. 7 is an external view of a yoke (second embodiment).

A cylindrical convex portion 81 (cylindrical convex portion) that protrudes toward the other side in the axial direction is formed on the upper piece portion 72 . The cylindrical convex portion 81 fits on the winding shaft 61 so that the outer peripheral surface faces the inner peripheral surface of the winding shaft 61 , and fits on the plunger 52 so that the inner peripheral surface faces the outer peripheral surface of the plunger 52 . If the plunger 52 is attracted to the cylindrical projection 81, the plunger 52 will not be able to move forward or backward smoothly. The cylindrical convex portion 81 is formed by drawing the upper piece portion 72 .

《Action》
Next, main effects of the second embodiment will be described.
A cylindrical convex portion 81 that protrudes toward the other side in the axial direction is formed on the upper piece portion 72 . The cylindrical convex portion 81 fits on the winding shaft 61 so that the outer peripheral surface faces the inner peripheral surface of the winding shaft 61 , and fits on the plunger 52 so that the inner peripheral surface faces the outer peripheral surface of the plunger 52 . As a result, foreign matter such as abrasion powder entering from the contact housing portion 49 is collected in the bag-like circular recess 67 and prevented from entering the sliding portion between the plunger 52 and the winding shaft 61 . Therefore, it is possible to prevent the smooth advance and retreat of the plunger 52 from being hindered.

Since the cylindrical convex portion 81 is formed integrally with the upper piece portion 72 by drawing, an increase in the number of parts can be suppressed. In the drawing process, when the height of the cylindrical projection 81 to be formed is the same, the smaller the diameter, the more difficult it is to secure the thickness for forming the cylindrical projection 81 . However, since the cylindrical projection 81 has a size that fits the outer peripheral surface of the plunger 52, the diameter can be increased. Therefore, the thickness for forming the cylindrical convex portion 81 can be easily secured, and the cylindrical convex portion 81 can be easily formed.
Other functions and effects are the same as those of the first embodiment described above.

<<Modification 2-1>>
In the second embodiment, the configuration in which the upper piece portion 72 and the cylindrical convex portion 81 are integrally molded has been described. may
FIG. 8 is a diagram showing Modification 2-1.
(a) in the figure is a perspective view of the yoke 53 viewed from the front side in the depth direction, and (b) in the figure is a perspective view of the yoke 53 viewed from the back side in the depth direction. The yoke 53 has an upper piece portion 72 and a cylindrical convex portion 81 formed separately, and the cylindrical convex portion 81 is fitted and fixed in the insertion hole 74 . In this way, by separately forming the plate-like upper piece 72 and the cylindrical convex portion 81, both of them have a simple shape, so that they are easy to form and can be manufactured at a low cost. .
Note that any modification described above can also be applied.

<<Third embodiment>>
"Constitution"
3rd Embodiment changes the form of the cylindrical convex part 81 in the upper piece part 72, Since it is the same as that of 2nd Embodiment mentioned above other than that, the same code|symbol is attached|subjected about a common structure. , the description is omitted.
FIG. 9 is a cross-sectional view of an airtight container (third embodiment).
FIG. 10 is an external view of a yoke (third embodiment).

A cylindrical convex portion 81 (cylindrical convex portion) that protrudes toward the other side in the axial direction is formed on the upper piece portion 72 . The cylindrical convex portion 81 fits into the circular concave portion 67 so that the outer peripheral surface faces the inner peripheral surface of the circular concave portion 67 , and the shaft 41 is inserted so that the inner peripheral surface faces the outer peripheral surface of the shaft 41 . If the plunger 52 is attracted to the cylindrical projection 81, the plunger 52 will not be able to move forward or backward smoothly. The cylindrical convex portion 81 is formed by drawing the upper piece portion 72 .

《Action》
Next, main effects of the third embodiment will be described.
A cylindrical convex portion 81 that protrudes toward the other side in the axial direction is formed on the upper piece portion 72 . The cylindrical convex portion 81 fits into the circular concave portion 67 so that the outer peripheral surface faces the inner peripheral surface of the circular concave portion 67 , and the shaft 41 is inserted so that the inner peripheral surface faces the outer peripheral surface of the shaft 41 . As a result, foreign matter such as abrasion powder entering from the contact housing portion 49 is concentrated in the bag-like circular recess 67 . Foreign matter such as aggregated abrasion powder cannot reach the sliding portion between the plunger 52 and the winding shaft 61 unless it passes between the cylindrical convex portion 81 and the circular concave portion 67. Entry of foreign matter can be more effectively suppressed by increasing the length of the path.
Other functions and effects are the same as those of the above-described second embodiment.
Note that any modification described above can also be applied.

<<Fourth embodiment>>
"Constitution"
4th Embodiment changes the form of a plunger, and since it is the same as that of 1st Embodiment mentioned above other than that, the same code|symbol is attached|subjected about a common structure, and description is abbreviate|omitted.
FIG. 11 is a cross-sectional view of an airtight container (fourth embodiment).
Here, a fixed plunger 52a and a movable plunger 52b are provided.
The fixed plunger 52a is a cylindrical fixed iron core extending in the axial direction, is inserted through one side of the winding shaft 61 in the axial direction, and is fixed by fitting the upper end side into the insertion hole 74 of the upper piece portion 72 . The fixed plunger 52a has a through-hole 86 extending axially through the center in the radial direction, through which the shaft 41 is inserted.

The movable plunger 52b is a columnar movable iron core extending in the axial direction, and is inserted through the other side of the winding shaft 61 in the axial direction so as to be movable forward and backward. A flange 66 projecting radially outward is formed at the other end of the movable plunger 52b in the axial direction. The movable plunger 52b is formed with a circular concave portion 67 having a circular cross-sectional shape that is concave toward the other side in the axial direction at one end in the axial direction. The movable plunger 52b is formed with a threaded hole 68 extending axially through the center in the radial direction, and the other end of the shaft 41 in the axial direction is fitted into the threaded hole 68 and connected.

The return spring 54 is interposed between the bottom surface of the circular recess 67 and the fixed plunger 52a while being inserted through the shaft 41, and biases the movable plunger 52b toward the other side in the axial direction.
When the flange 66 is attracted to the auxiliary yoke 56, the distance between the flange 66 and the lower piece 73 and the distance between one end of the movable plunger 52b and the other end of the fixed plunger 52a are substantially equal. However, the separation distance between the flange 66 and the lower piece portion 73 is less than or equal to the separation distance between one end of the movable plunger 52b and the other end of the fixed plunger 52a. Therefore, when the plunger 52 is displaced to one side in the axial direction, at least the flange 66 and the lower piece portion 73 come into contact with each other.

As described above, when the coil 62 is not energized and in a de-energized state, the magnetic force of the permanent magnet 55 and the repulsive force of the return spring 54 cause the movable plunger 52b to retreat to the other side in the axial direction, and the flange 66 moves toward the auxiliary yoke 56. are adsorbed. As a result, the shaft 41 is also retracted to the other side in the axial direction, so that the contact portion 21 is opened (released state). At this time, the flange 66 is separated from the lower piece portion 73, and one end of the movable plunger 52b is separated from the other end of the fixed plunger 52a.
When the coil 62 is energized and excited from this state, the flange 66 is attracted to the lower piece 73 and the movable plunger 52b is attracted to the fixed plunger 52a. That is, the movable plunger 52b advances in one axial direction against the magnetic force of the permanent magnet 55 and the repulsive force of the return spring 54, and the shaft 41 also advances in one axial direction accordingly. The part 21 is closed (closed state).

《Action》
Next, main effects of the fourth embodiment will be described.
Since the inertial force of the movable member increases as the mass becomes heavier, there is a possibility that the contact portion 21 may rebound or malfunction, and it is also disadvantageous against vibration. Therefore, the plunger 52 described above is divided into a fixed plunger 52a and a movable plunger 52b. The fixed plunger 52a is fixed to the upper piece portion 72, and the movable plunger 52b is arranged on the other side in the axial direction of the fixed plunger 52a, and only the movable plunger 52b can advance and retreat. The movable plunger 52b is lighter in weight than the plunger 52 described above because it is shorter in the axial direction, and has a smaller inertia force. is also advantageous.
Other functions and effects are the same as those of the first embodiment described above.
Note that any modification described above can also be applied.

<<Fifth Embodiment>>
"Constitution"
In the fifth embodiment, the shape of a pair of fixed contacts is changed, and other than that, it is the same as the first embodiment described above, so the same reference numerals are given to the common configurations, and the description is omitted. do.
FIG. 12 is an external view of an airtight container (fifth embodiment).
FIG. 13 is a cross-sectional view of an airtight container (fifth embodiment).

The pair of fixed contacts 91 are made of conductive metal and are arranged with a gap in the vertical direction. The fixed contacts 91 are formed in a plate shape extending in the longitudinal direction and the width direction, and are arranged in series inside the sealed container 11 at intervals along the longitudinal direction. A fixed contact 34 is formed on the surface on the far side in the depth direction on one end side of each facing side. A terminal hole 93 penetrating in the depth direction is formed on the other end side of each side facing each other. The pair of fixed contacts 91 are connected to the primary side of the circuit and the other to the secondary side of the circuit by fastening terminal bolts to the terminal holes 93 , respectively.
The fixed contact 91 is integrated by insert molding so that the surface on the front side in the depth direction contacts the ceiling surface of the case portion 12 and passes through the vertical side wall of the case portion 12 . The method of insert molding is the same as that of the stationary contactor 31 described above.

《Action》
Next, main effects of the fifth embodiment will be described.
A pair of fixed contacts 91 are arranged with a gap inside the sealed container 11 , fixed contacts 34 are formed on one end side of each, and the other ends of the fixed contacts 91 are connected to a circuit outside the sealed container 11 . The fixed contact 91 has a plate-like shape extending in the vertical direction and penetrates the side wall of the case portion 12 in the vertical direction. Therefore, since it has a simple plate-like shape, it can be manufactured at low cost, and the dimension in the depth direction of the product can be reduced.
Other functions and effects are the same as those of the first embodiment described above.
Note that any modification described above can also be applied.

Although the foregoing has been described with reference to a limited number of embodiments, the scope of rights is not limited thereto, and modifications of the embodiments based on the above disclosure will be obvious to those skilled in the art. Moreover, each embodiment and modification can be combined arbitrarily and adopted.

11... Closed container, 12... Case part, 13... Bottom part, 14... Insulating wall, 21... Contact part, 22... Electromagnet part, 31... Fixed contact, 32... Movable contact, 33... Screw hole, 34... Fixed contact, 35... Movable contact, 41... Shaft, 42... Through hole, 45... Partition member, 46 ...through hole, 47...permanent magnet, 48...yoke, 49...contact housing, 51...spool, 52...plunger, 52a...fixed plunger, 52b... Movable plunger, 53... Yoke, 54... Return spring, 55... Permanent magnet, 56... Auxiliary yoke, 61... Winding shaft, 62... Coil, 66... Flange, 67 ... circular recess, 68 ... threaded hole, 71 ... side piece, 71a ... side piece, 71b ... side piece, 72 ... upper piece, 72a ... top Piece 72b Upper piece 73 Lower piece 73a Lower piece 73b Lower piece 74 Insertion hole 74a Insertion groove 74b ... Insertion groove, 75 ... Insertion hole, 75a ... Insertion groove, 75b ... Insertion groove, 76 ... Round hole, 81 ... Cylindrical protrusion, 86 ... Through hole, 91 ...fixed contacts, 93...terminal holes

Claims (14)

a contact portion arranged on one side in a predetermined axial direction and configured to open and close an electrical path of a circuit by operating along the axial direction;
an electromagnet unit arranged on the other side in the axial direction for switching opening and closing of the contact unit;
The electromagnet unit
comprising a plunger that opens and closes the contact portion by displacement in the axial direction;
The electromagnetic contactor, wherein the plunger is provided with a flange that is attracted by excitation on the other side in the axial direction. a contact portion arranged on one side in a predetermined axial direction and configured to open and close an electrical path of a circuit by operating along the axial direction;
an electromagnet unit arranged on the other side in the axial direction for switching opening and closing of the contact unit;
A sealed resin container that seals the contact portion and the electromagnet portion and contains a gas for breaking the contact portion,
The electromagnet unit
comprising a plunger that opens and closes the contact portion by displacement in the axial direction;
The electromagnetic contactor, wherein the plunger is provided with a flange that is attracted by excitation on the other side in the axial direction. The electromagnet unit
a spool in which the plunger is inserted inside the tubular portion extending in the axial direction and a coil is wound around the outside of the tubular portion;
a yoke that forms a magnetic path when excited by energizing the coil;
The yoke is
a side piece provided outside the coil in a direction orthogonal to the axial direction;
a one piece portion provided on one side in the axial direction of the side piece portion;
a second piece provided on the other side in the axial direction of the side piece and attracting the flange on the other side in the axial direction when the coil is excited by energization of the coil. The electromagnetic contactor according to claim 1 or 2. The electromagnet unit
an auxiliary permanent magnet attached to the other side of the other piece in the axial direction;
4. The electromagnetic according to claim 3, further comprising an auxiliary yoke that is attached to the other side of the auxiliary permanent magnet in the axial direction and that attracts the flange when the coil is not energized and is not energized. contactor. a pair of stationary contacts arranged with a space therebetween, each having one end formed with a stationary contact and the other end connected to the circuit;
a movable contact that has movable contacts formed on both end sides and that makes each of the movable contacts contact and separate from the fixed contact;
The contact portion is formed by the fixed contact and the movable contact,
5. The magnetic contactor according to claim 3, further comprising a shaft extending in the axial direction, one side of which is connected to the movable contact, and the other side of which is connected to the plunger. The plunger is formed with a recess that is recessed toward the other side in the axial direction at one end in the axial direction,
The one piece portion protrudes toward the other side in the axial direction, fits into the recess so that the outer peripheral surface faces the inner peripheral surface of the recess, and the inner peripheral surface faces the outer peripheral surface of the shaft. 6. The electromagnetic contactor according to claim 5, wherein a cylindrical convex portion through which said shaft is inserted is formed so as to do so. The one piece portion protrudes toward the other side in the axial direction and fits into the cylindrical portion so that the outer peripheral surface faces the inner peripheral surface of the cylindrical portion, and the inner peripheral surface is the outer peripheral surface of the plunger. The electromagnetic contactor according to any one of claims 3 to 5, characterized in that a cylindrical protrusion that fits into the plunger is formed so as to face the plunger. 8. The magnetic contactor according to claim 6, wherein the one piece portion and the cylindrical convex portion of the yoke are formed separately. The electromagnetic contactor according to any one of claims 3 to 8, wherein the yoke has the side piece portion and the other piece portion formed separately. The electromagnetic contactor according to any one of claims 3 to 9, wherein the yoke is divided in a direction orthogonal to the axial direction and formed individually. The plunger is
a fixed plunger fixed to the one piece;
11. The electromagnetic contact according to any one of claims 3 to 10, further comprising a moveable plunger arranged on the other side in the axial direction of the fixed plunger and provided with the flange and capable of advancing and retreating. vessel. The magnetic contactor according to any one of claims 1 to 11, wherein the plunger has the flange formed separately. 13. The arc-extinguishing permanent magnet facing across the contact portion in a direction orthogonal to the axial direction and extinguishing an arc generated when the contact portion is opened is provided. The magnetic contactor described in the paragraph. 3. The electromagnetic contactor according to claim 2, wherein the sealed container is gas-barrier-coated with a laminated film of clay crystals.

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