JP2015018779A - Electromagnetic contactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic contactor capable of securely joining an outer case and an electromagnet unit to be a drive part without increasing weight.SOLUTION: The electromagnetic contactor includes: a contact device 100 in which a movable contact is disposed so as to be capable of being connected to/detached from a stationary contact; an electromagnet unit 200 for moving a movable contact of the contact device; and an outer case 400 that houses and holds at least the electromagnet unit. The electromagnet unit is fitted and held by the outer case.

Description

  The present invention relates to an electromagnetic contactor including a contact device in which a movable contact is detachably arranged with respect to a fixed contact, and an electromagnet unit that moves the movable contact of the contact device.

  In an electromagnetic contactor that opens and closes a current path, a movable contact is driven by an excitation coil and a movable plunger of an electromagnet unit. That is, when the exciting coil is in a non-excited state, the movable plunger is urged by the return spring, and the movable contact is released from the pair of fixed contacts arranged at a predetermined interval. . By exciting the exciting coil from this released state, the movable plunger is moved against the return spring, and the movable contact is brought into contact with the pair of fixed contacts (see, for example, Patent Document 1). ).

Japanese Patent No. 3107288

By the way, in the conventional example described in Patent Document 1, a housing that covers the sealing contact portion and the driving portion is provided, and a box-shaped lower housing in which the upper end that covers the driving portion is opened, The upper housing covers the sealing contact portion joined to the upper end of the side housing.
Here, the drive unit has, for example, a rectangular frame-shaped yoke whose front and rear end surfaces are open so as to surround the exciting coil, and both side plates of the rectangular frame-shaped yoke are accommodated in the lower housing, and the sealing contact portion is The fixed contact is protruded from the upper surface and accommodated in the upper housing.

However, in the conventional example described in Patent Document 1, the sealing contact portion and the drive portion are accommodated in the housing, but when a large impact is applied to the housing, the joint portion between the upper and lower housings There is an unsolved problem that all the stresses are generated, and the sealing contact part and the drive part may be scattered due to disconnection.
Further, when vibration is applied to the housing in a certain frequency band, resonance occurs at the joint between the sealed contact portion and the drive portion and the upper housing and the lower housing. There is an unresolved problem that may be scattered.

In order to solve this unsolved problem, it is conceivable to integrate the drive unit and the lower housing by enclosing an adhesive or resin in at least the lower housing that houses the drive unit. However, in this case, since an adhesive or resin is sealed between the drive unit and the lower housing, there are new problems such as an increase in product weight, an increase in manufacturing cost, and poor assembly workability. is there.
Therefore, the present invention has been made paying attention to the unsolved problems of the above-described conventional example, and can be reliably performed without increasing the weight between the outer case and the electromagnet unit serving as the drive unit. The purpose is to provide a contactor.

In order to achieve the above object, a first aspect of an electromagnetic contactor according to the present invention includes a contact device in which a movable contact is detachably arranged with respect to a fixed contact, and a movable contact of the contact device. And an outer case that houses and holds at least the electromagnet unit, and the electromagnet unit is fitted and held in the outer case.
According to a second aspect of the electromagnetic contactor of the present invention, the electromagnet unit has a frame-shaped magnetic yoke surrounding the exciting coil constituting the electromagnet, and a pair along the outer peripheral surface of the exciting coil of the magnetic yoke. A fitting convex portion that fits into the fitting portion of the outer case is formed on the end surface of the side plate portion.
Moreover, the 3rd aspect of the electromagnetic contactor which concerns on this invention has a narrow part formed in the lower end side, and a wide part formed in the upper end side, and a pair of said side plate part has the said narrow part. And the fitting convex part is formed in at least one of the wide part.

Further, according to a fourth aspect of the electromagnetic contactor of the present invention, the pair of side plate portions includes a narrow portion formed on the lower end side and a wide portion formed on the upper end side, and the narrow portion The fitting projections are formed on the outer case, and fitting projections are formed at the four corners of the outer case.
Moreover, as for the 5th aspect of the electromagnetic contactor which concerns on this invention, the said fitting convex part is formed in the sawtooth shape.
According to a sixth aspect of the electromagnetic contactor of the present invention, the exterior case includes a lower case that houses the electromagnet unit and an upper case that houses the contact device.
Moreover, the 7th aspect of the electromagnetic contactor which concerns on this invention is equipped with the engaging board part which the said upper case engages so that the upper end of the said exterior case may be clamped from the outside.

  According to the present invention, at least the relatively heavy electromagnet unit is fitted and held in the outer case, so that the electromagnet unit is detached from the outer case even when a large impact is applied to the outer case or when resonance occurs. It is possible to hold it without fail.

It is a perspective view which shows an example of the electromagnetic contactor which concerns on this invention. It is a perspective view of the state where the exterior case of the magnetic contactor concerning the present invention was removed. It is the perspective view of the state which looked at the lower case part from the upper surface side. It is AA sectional view taken on the line of FIG. It is sectional drawing which shows the lower case which integrated the contact apparatus and the electromagnet unit, and the upper case with which this is mounted | worn. It is a reference figure which shows the case where an electromagnet unit is integrated with a lower case part by resin sealing. It is a perspective view which shows the 2nd Embodiment of this invention. It is sectional drawing which shows the lower case which integrated the contact apparatus and electromagnet unit of the 2nd Embodiment of this invention, and the upper case with which this is mounted | worn.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a first embodiment of an electromagnetic contactor according to the present invention, FIG. 2 is a perspective view with an outer case removed, and FIG. 3 is a perspective view with a lower case seen from above, FIG. 4 is a cross-sectional view taken along the line AA of FIG.
In the figure, reference numeral 10 denotes an electromagnetic contactor. As shown in FIG. 2, the electromagnetic contactor 10 is an electromagnetic in which a contact device 100 having a contact mechanism and an electromagnet unit 200 for driving the contact device 100 are integrated. The contactor body 300 and an exterior case 400 that covers the electromagnetic contactor body 300 are configured.

  As shown in FIG. 4, the specific configuration of the contact device 100 constituting the electromagnetic contactor main body 300 includes a contact storage case 101 having a lower end surface opened. The contact storage case 101 includes a metal rectangular tube body 102 whose upper and lower end surfaces are opened, a ceramic top plate 103 that closes the upper end surface of the rectangular tube body 102, and an inner peripheral surface of the rectangular tube body 102. It is comprised with the bottomed square cylinder 104 which open | released the arrange | positioned upper end.

A contact mechanism 105 is stored in the contact storage case 101. The contact mechanism 105 includes a pair of left and right fixed contacts 106a and 106b, and a movable contact 120 arranged so as to be able to contact and separate from the contacts of the fixed contacts 106a and 106b.
Each of the pair of left and right stationary contacts 106a and 106b is joined to the contact portions 107a and 107b formed in a U-shaped cross section and arranged on the left and right objects at a predetermined interval, and the upper ends of these contact portions 107a and 107b. And external connection terminals 108a and 108b. The inner peripheral surfaces of the side plate portion and the upper plate portion excluding the lower plate portion of the contact portion 107a are covered with insulating covers 109a and 109b.

  The movable contact 120 has a contact plate 121 supported by a connecting shaft 131 fixed to a movable plunger 215 of the electromagnet unit 200 described later, and the left and right ends of the contact plate 121 are fixed contacts 106a and 106b. The contact portions 107a and 107b are inserted between the upper plate portion and the lower plate portion. The connecting shaft 131 has a flange portion 131a that protrudes outward at the upper end. The contact spring 132 is inserted into the connecting shaft 131 from the lower end side, and then the through hole 133 of the movable contactor 120 is inserted, and the upper end of the contact spring 132 is brought into contact with the flange portion 131a. The movable contact 120 is positioned by, for example, a C-ring 134 so as to obtain a force.

  In the released state, the movable contact 120 is in a state where the contact portions 120a at both ends and the contact portions 107a and 107b of the fixed contacts 106a and 106b are separated from each other with a predetermined interval. In addition, the movable contact 120 has a predetermined position by a contact spring 132 at a closing position, with a contact portion 120a formed on the lower surfaces of both ends being connected to a contact 110a on the lower plate portion 118 of the contact portions 107a and 107b of the fixed contacts 106a and 106b. It is set to contact at a contact pressure of.

As shown in FIG. 4, the electromagnet unit 200 has a U-shaped magnetic yoke 201 that is flat when viewed from the side, and a cylindrical auxiliary yoke 203 is fixed to the center of the bottom plate portion 201a of the magnetic yoke 201. Yes. A spool 204 is disposed outside the cylindrical auxiliary yoke 203.
The spool 204 includes a central cylindrical portion 205 that passes through the cylindrical auxiliary yoke 203, a lower flange portion 206 that protrudes radially outward from the lower end portion of the central cylindrical portion 205, and a radial direction from the upper end of the central cylindrical portion 205. The upper flange portion 207 protrudes outward. An exciting coil 208 is wound around a storage space formed by the central cylindrical portion 205, the lower flange portion 206, and the upper flange portion 207.

The upper magnetic yoke 210 is fixed between the upper ends of the magnetic yoke 201 serving as the open end. The upper magnetic yoke 210 is formed with a through hole 210 a facing the central cylindrical portion 205 of the spool 204 at the central portion.
In the central cylindrical portion 205 of the spool 204, a movable plunger 215 having a return spring 214 disposed between a bottom portion and a bottom portion of a cap, which will be described later, is slidably disposed. The movable plunger 215 is formed with a peripheral flange portion 216 protruding outward in the radial direction at an upper end portion protruding upward from the upper magnetic yoke 210.

Further, on the upper surface of the upper magnetic yoke 210, for example, a permanent magnet 220 having an annular shape having a square outer shape and a circular through hole 220 a is fixed so as to surround the peripheral flange portion 216 of the movable plunger 215. The permanent magnet 220 is magnetized so that the upper end side is, for example, an N pole and the lower end side is an S pole in the vertical direction, that is, the thickness direction.
An auxiliary yoke 225 having a through hole 224 having the same outer shape as the permanent magnet 220 and having an inner diameter smaller than the outer diameter of the peripheral flange portion 216 of the movable plunger 215 is fixed to the upper end surface of the permanent magnet 220. The peripheral flange 216 of the movable plunger 215 is in contact with the lower surface of the auxiliary yoke 225.
The shape of the permanent magnet 220 is not limited to the above, and can be formed in an annular shape. In short, if the inner peripheral surface matches the shape of the peripheral flange portion 216, the outer shape is circular. It can be made into arbitrary shapes, such as a square.
A connecting shaft 131 that supports the above-described movable contact 120 is screwed to the upper end surface of the movable plunger 215.

The movable plunger 215 is covered with a cap 230 made of a non-magnetic material and formed in a bottomed cylindrical shape, and a flange portion 231 formed to extend radially outward from the open end of the cap 230 has an upper magnetic yoke. The lower surface of 210 is sealed and joined. Further, the bottom surface of the rectangular tube body 102 of the contact housing case 101 is sealed and joined to the upper surface of the upper magnetic yoke 210. As a result, the contact device 100 and the electromagnet unit 200 are integrated, and an airtight chamber 240 is formed in which the contact housing case 101 and the cap 230 communicate with each other via the through hole 210a of the upper magnetic yoke 210. A gas such as hydrogen gas, nitrogen gas, a mixed gas of hydrogen and nitrogen, air, or SF ₆ is sealed in an airtight chamber 240 formed by the contact housing case 101 and the cap 230.

  Further, the magnetic yoke 201 is formed in a flat U shape by a bottom plate portion 201a and side plate portions 201b and 201c bent at a right angle upward from front and rear end portions of the bottom plate portion 201a. As shown in FIG. 2, the side plate portions 201b and 201c include a narrow portion 201d connected to the bottom plate portion 201a and a wide portion 201e formed wider than the narrow portion 201d connected to the upper end of the narrow portion 201d. It is configured. And the fitting convex part 201f which protrudes each outward is formed in the left-right end surface of the narrow part 201d. The fitting convex portion 201f is formed in a sawtooth shape, and extends at a substantially right angle with respect to the end surface from the top surface of the inclined portion 201g to the end surface inwardly from the top of the inclined portion 201g. The folded portion 201h is continuously formed upward.

On the other hand, as shown in FIGS. 3 to 5, the outer case 400 includes a lower case 400 a that opens the upper end that houses the electromagnet unit 200, and an upper case 400 b that is locked to the upper end of the lower case 400 a. ing.
The lower case 400a is formed in a bottomed rectangular tube shape having an open upper end surface. As shown in FIG. 1, the lower case 400a is provided with a mounting plate 401 having screw insertion holes formed in the longitudinal direction of the lower case 400a at the lower part of the front end surface of the outer surface. As shown in FIG. 5, the fitting rectangular tube portions 402 having an L-shaped cross section are formed at the four corners as fitting portions for fitting the fitting convex portions of the electromagnet unit 200. Further, as shown in FIG. 5, four engagement holes 405 are formed at positions near the front and rear end portions on the upper end sides of the left and right side plate portions 404a and 404b.

  And the electromagnet unit 200 which integrated the contact apparatus 100 from the upper side of the lower case 400a is inserted, and the electromagnet unit 200 is fitted between the pair of left and right fitting square tube portions 402. At this time, as shown in FIG. 5, the fitting convex portions 201 f formed on the left and right end surfaces of the narrow portion 201 d of the side plate portions 201 b and 201 c of the magnetic yoke 201 of the electromagnet unit 200 are formed on the wall surface of the fitting rectangular tube portion 402. Mated. For this reason, the upward movement of the electromagnet unit 200 from the lower case 400a is reliably restricted.

  On the other hand, as shown in FIG. 5, the upper case 400b is formed in a rectangular tube shape with its lower end opened, and the upper plate portion 411a has a through-hole that allows the external connection terminals 108a and 108b of the contact device 100 to be externally desired. 412 is formed, and the left and right side plate portions 411b and 411c are formed with engagement plate portions 413 protruding downward at positions close to the front and rear ends. As shown in FIG. 5, the engaging plate portion 413 is formed with a hook portion 414 protruding outward on the outer surface on the lower end side.

  Then, as shown in FIG. 5, the upper case 400b is mounted on the lower case 400a fitted and fixed with the electromagnet unit 200 in which the contact device 100 is integrated from above. At this time, the external connection terminals 108a and 108b of the contact device 100 are projected to the outside through the through hole 412, and the hook portion 414 of the engagement plate portion 413 is engaged with the engagement hole 405 of the lower case 400a, thereby The case 400b can be fixed to the lower case 400a.

Next, the operation of the first embodiment will be described.
Now, the external connection terminal 108a connected to the contact 107a of the fixed contact 106a is connected to, for example, a power supply source that supplies a large current, and the external connection terminal 108b connected to the contact 107b of the fixed contact 106b is loaded. It is assumed that it is connected to
In this state, it is assumed that the exciting coil 208 in the electromagnet unit 200 is in a non-excited state and the electromagnet unit 200 is in a released state in which no exciting force for lowering the movable plunger 215 is generated. In this released state, the movable plunger 215 is urged upward by the return spring 214 away from the upper magnetic yoke 210. At the same time, the attractive force due to the magnetic force of the permanent magnet 220 is applied to the auxiliary yoke 225, and the peripheral flange 216 of the movable plunger 215 is attracted. For this reason, the upper surface of the peripheral flange 216 of the movable plunger 215 is in contact with the lower surface of the auxiliary yoke 225.

When the exciting coil 208 of the electromagnet unit 200 is energized from this released state, an exciting force is generated by the electromagnet unit 200 and the movable plunger 215 is resisted against the biasing force of the return spring 214 and the attractive force of the annular permanent magnet 220. Lower. The lowering of the movable plunger 215 is stopped when the lower surface of the peripheral flange portion 216 comes into contact with the upper surface of the upper magnetic yoke 210.
As described above, when the movable plunger 215 is lowered, the movable contact 120 connected to the movable plunger 215 via the connecting shaft 131 is also lowered, and the contact portion 120a thereof becomes the contact 110a of the fixed contacts 106a and 106b. Contact is made with the contact pressure of the contact spring 132.

For this reason, a closed state is reached in which a large current from the external power supply source is supplied to the load through the fixed contact 106a, the movable contact 120, and the fixed contact 106b.
When the current supply to the load is interrupted from the closed state of the contact mechanism, the excitation of the excitation coil 208 of the electromagnet unit 200 is stopped.
As a result, the exciting force that moves the movable plunger 215 downward by the electromagnet unit 200 disappears, so that the movable plunger 215 rises by the urging force of the return spring 214, and the annular permanent magnet 216 as the peripheral flange 216 approaches the auxiliary yoke 225. The suction force of 220 increases.

  As the movable plunger 215 rises, the movable contact 120 connected via the connecting shaft 131 rises. In response to this, the movable contact 120 is in contact with the stationary contacts 106a and 106b while the contact pressure is applied by the contact spring 132. Thereafter, when the contact pressure of the contact spring 132 disappears, the movable contact 120 is in an open state in which it is separated upward from the fixed contacts 106a and 106b.

When this contact opening start state is reached, an arc is generated between the contact 110a of the fixed contacts 106a and 106b and the contact 120a of the movable contact 120, and the current conduction state is continued by this arc. At this time, since the insulating covers 109a and 109b covering the upper and side plates of the contact portions 107a and 107b of the fixed contacts 106a and 106b are mounted, the arc is movable in contact with the contacts 110a of the fixed contacts 106a and 106b. It can be generated only between the contact 120a of the child 120. For this reason, it is possible to reliably prevent the arc from moving on the upper plate portion and the side plate portion of the contact portions 107a and 107b of the stationary contacts 106a and 106b, thereby stabilizing the arc generation state and improving the arc extinguishing performance. Can be made. In addition, by covering both the upper and side plates of the contact portions 107a and 107b of the fixed contacts 106a and 106b with the insulating covers 109a and 109b, it is possible to reliably prevent the arc tip from being short-circuited. .
The arc is stretched to the left and right sides of the contact portions 107a and 107b of the stationary contacts 106a and 106b and extinguished.

The operation of the electromagnetic contactor 10 is as described above, and an impact force is applied to the electromagnetic contactor 10 from the outside or resonance occurs, and a force that pulls upward from the lower case 400a is applied to the electromagnet unit 200. Shall be.
At this time, a fitting square tube for insertion in which serrated fitting convex portions 201f formed in the narrow portions 201d of the side plate portions 201b and 201c of the magnetic yoke 201 of the electromagnet unit 200 are formed at the four corners of the inner peripheral surface of the lower case 400a. It bites into the part 402 and is fitted. Therefore, the electromagnet unit 200 and the lower case 400a are firmly connected. For this reason, it can prevent reliably that the electromagnet unit 200 slips upward from the lower case 400a.

Moreover, the escape of the electromagnet unit 200 from the lower case 400a includes sawtooth-shaped fitting convex portions 201f formed on the magnetic yoke 201 of the electromagnet unit 200, and fitting square tube portions 402 provided at the four corners of the lower case 400a. Can be reliably prevented by simply fitting them. Therefore, no new parts are added or the weight is increased in order to prevent removal, and the whole can be reduced in size and weight.
Furthermore, since the fitting convex portion 201f and the fitting square tube portion 402 are fitted on the bottom side of the bottomed rectangular tube-shaped lower case 400a, the fitting convex portion 201f is fitted to the fitting square tube portion 402. At this time, the lower case 400a does not open outward, and the fitting convex portion 201f and the fitting rectangular tube portion 402 can be reliably fitted.

Incidentally, when the fitting convex portion 201f is not provided, in order to connect the electromagnet unit 200 and the lower case 400a, as shown in FIG. 6, a synthetic resin material is provided at the connecting portion between the electromagnet unit 200 and the lower case 400a. It is necessary to fill with a filler 450 such as adhesive or adhesive, and it takes time to fill the filler 450, making it impossible to perform assembly work efficiently and increasing the weight. I can't plan.
However, in this embodiment, as described above, it is only necessary to fit the fitting convex portion 201f formed on the electromagnet unit 200 to the fitting rectangular tube portion 402 of the lower case 400a. The lower case 400a can be firmly integrated.

Next, a second embodiment of the present invention will be described with reference to FIGS.
In the second embodiment, instead of forming the fitting convex portion on the narrow portion of the magnetic yoke 201 of the electromagnet unit 200, the fitting convex portion is formed on the wide portion.
That is, in the second embodiment, as shown in FIG. 8, instead of the case where the serrated fitting convex portion 201 f is formed on the side plate portion 201 b of the magnetic yoke 201 of the electromagnet unit 200 and the narrow portion 201 d of the 201 c. In addition, serrated fitting convex portions 250 are formed on the left and right end surfaces of the wide portion 201e of the side plate portions 201b and 201c.

A hook portion 414 is formed on the inner side so that the engaging plate portion 413 of the upper case 400b is locked to the engaging hole 405 from the outer side of the lower case 400a.
The other configurations are the same as those in the first embodiment described above, and the same reference numerals are given to the corresponding parts to those in FIG. 5, and the detailed description thereof will be omitted.
According to the second embodiment, as shown in FIG. 8, by inserting the electromagnet unit 200 into the lower case 400a, both left and right end surfaces of the wide portion 201e of the side plate portions 201b and 201c of the magnetic yoke 201 of the electromagnet unit 200 are obtained. The serrated fitting convex portion 250 formed on the right and left side plate portions 404a and 404b of the lower case 400a is fitted to the inner peripheral surfaces.

In this state, when the upper case 400b is attached to the lower case 400a from above, the hook portion 414 of the engagement plate portion 413 comes into contact with the outer surface of the lower case 400a and the engagement plate portion 413 is bent outward, and then the hook portion. By engaging 414 with the engagement hole 405 of the lower case 400a, the upper case 400b is integrated with the lower case 400a.
Also in the second embodiment, the serrated fitting convex portion 250 formed on the side plate portions 201b and 201c of the magnetic yoke 201 of the electromagnet unit 200 is fitted to the inner peripheral surface of the lower case 400a. ing. For this reason, when the force which pulls upward from the lower case 400a acts on the electromagnet unit 200, the electromagnet unit 200 can be prevented from being pulled out by the fitting of the fitting convex portion 250.

  At this time, since the fitting convex portion 250 is fitted to the open end portion side of the lower case 400a, the lower case 400a is easily bent outward, and the fitting force of the fitting convex portion 250 to the lower case 400a is reduced. there is a possibility. However, in this embodiment, since the engagement plate portion 413 of the upper case 400b is in contact with the outer surface of the lower case 400a, the engagement plate portion 413 can suppress the bending of the upper case 400b to the outside, and the fitting is performed. The fitting state of the joint convex part 250 can be maintained.

In the first and second embodiments, only an example of the contact device 100 and the electromagnet unit 200 has been described, and the internal configurations of the contact device 100 and the electromagnet unit 200 can be arbitrary.
In the first and second embodiments, the case where the mounting plate 401 is formed on the lower side in the front-rear direction of the lower case 400a and the lower case extends in a direction perpendicular to the mounting surface will be described. However, the present invention is not limited to this, and the screw insertion hole may be formed in a direction perpendicular to the longitudinal direction of the lower case 400a.

In the first and second embodiments, the case where the fitting protrusions 201f and 250 are formed in a sawtooth shape has been described. It may be formed in a triangular waveform. In short, it is only necessary that the fitting is performed so as to bite into the lower case body 400a and a large fitting holding force can be generated.
Further, in the first and second embodiments, the case where the fitting convex portions 201f and 250 are formed on both the side plate portions 201b and 201c of the magnetic yoke 201 has been described, but the fitting is applied to one of the side plate portions. The fitting protrusions 201f and 250 may be formed, and the fitting protrusions 201f and 250 are formed on the outer end surface of the bottom plate portion 201a of the magnetic yoke 201 or the fitting piece formed on the outer end surface. May be.

In the first and second embodiments, the case where the contact housing case 101 and the cap 230 form the airtight chamber 240 and the gas is sealed in the airtight chamber 240 has been described. However, the present invention is not limited to this. However, if the current to be cut off is low, gas filling may be omitted.
In the first and second embodiments, the case in which the outer case 400 is divided into the lower case 400a and the upper case 400b has been described. However, the present invention is not limited to this, and the lower case 400a and the upper case are not limited thereto. 400b may be integrated into a rectangular tube shape with the upper end surface or the lower end surface opened, and a closing plate portion that closes the upper end surface or the lower end surface may be provided.

  DESCRIPTION OF SYMBOLS 10 ... Electromagnetic contactor, 100 ... Contact apparatus, 101 ... Contact storage case, 106a, 106b ... Fixed contact, 107a, 107b ... Contact part, 120 ... Movable contact, 200 ... Electromagnet unit, 201 ... Magnetic yoke, 201f ... Fitting convex part, 203 ... cylindrical auxiliary yoke, 204 ... spool, 208 ... excitation coil, 210 ... upper magnetic yoke, 214 ... return spring, 215 ... movable plunger, 220 ... permanent magnet, 225 ... auxiliary yoke, 250 ... fitting Joint convex part, 400 ... exterior case, 400a ... lower case, 400b ... upper case, 401 ... mounting plate part, 402 ... square tube part for insertion, 413 ... engagement plate part

Claims (7)

A contact device in which the movable contact is arranged so as to be able to contact and separate from the fixed contact;
An electromagnet unit that moves the movable contact of the contact device;
An exterior case for storing and holding at least the electromagnet unit;
The electromagnet unit is fitted and held in the outer case.   The electromagnet unit has a frame-shaped magnetic yoke surrounding an exciting coil constituting the electromagnet, and is fitted into the fitting portion of the outer case on the end surfaces of a pair of side plate portions along the outer peripheral surface of the exciting coil of the magnetic yoke. The electromagnetic contactor according to claim 1, wherein a fitting convex portion is formed.   The pair of side plate portions includes a narrow portion formed on the lower end side and a wide portion formed on the upper end side, and the fitting convex portion is formed on at least one of the narrow portion and the wide portion. The electromagnetic contactor according to claim 2, wherein the electromagnetic contactor is provided.   The pair of side plate portions has a narrow portion formed on the lower end side and a wide portion formed on the upper end side, the fitting convex portions are formed on the narrow portion, and the four corners of the exterior case are formed. The electromagnetic contactor according to claim 2, wherein a fitting protrusion for fitting the fitting protrusion is formed.   The electromagnetic contactor according to claim 2, wherein the fitting convex portion is formed in a sawtooth shape.   6. The electromagnetic contactor according to claim 1, wherein the outer case includes a lower case that accommodates the electromagnet unit, and an upper case that accommodates the contact device.   The electromagnetic contactor according to claim 6, wherein the upper case includes an engagement plate portion that engages so as to sandwich an upper end of the exterior case from the outside.

Images