JP2016062692A - Electromagnetic contactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic contactor which does not affect the operation of a movable plunger even flux is generated by excitation of an excitation coil.SOLUTION: An electromagnetic contactor comprises a contact mechanism 2 including a pair of stationary contacts 22 and 23 and a movable contact 25 which can be contacted to and separated from the pair of stationary contacts, and an electromagnet unit 3 which drives the contact mechanism. The electromagnet unit comprises a movable plunger 35 connected to the movable contact, an excitation coil 34 which generates flux by excitation to drive the movable plunger in a driving direction, magnetic yokes 8 and 31 surrounding the excitation coil, and a stationary plunger 32 fixed to the magnetic yoke 31 and facing the driving direction of the movable plunger. The pole contact surfaces 32a and 40a of the movable plunger and the stationary plunger are formed facing the driving direction fo the movable plunger.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electromagnetic contactor that opens and closes a current path.

As an electromagnetic contactor for opening and closing a current path, for example, the one described in Patent Document 1 is known.
The electromagnetic contactor described in Patent Document 1 includes a contact mechanism having a pair of fixed contacts, a movable contact that can be contacted with and separated from the pair of fixed contacts, and an electromagnet unit that drives the contact mechanism. Yes.
The electromagnet unit includes a movable plunger coupled to a movable contact of a contact mechanism by a coupling shaft, an excitation coil that generates a magnetic flux by applying a predetermined voltage to drive the movable plunger, and a magnetic yoke that surrounds the excitation coil. It has. The movable plunger includes a cylindrical plunger body and a peripheral flange portion formed at the other end of the plunger body.
The magnetic yoke is composed of a lower magnetic yoke having a U-shaped cross section and an upper magnetic yoke that bridges the upper opening of the lower magnetic yoke, and a plunger through hole is formed in the upper magnetic yoke. A cylindrical fixed plunger is fixed to the bottom of the lower magnetic yoke, and when the spool is disposed on the bottom of the lower magnetic yoke, the fixed plunger is inserted into the lower portion of the central cylindrical portion of the spool.

Further, the plunger main body of the movable plunger is inserted through the plunger through hole of the upper magnetic yoke and the central cylindrical portion of the spool, and is arranged so that the lower outer periphery of this plunger main body overlaps with a part of the fixed plunger. And the surrounding flange part of a movable plunger is made to oppose the upper magnetic yoke around a plunger through-hole.
Further, a permanent magnet magnetized in the movable direction of the movable plunger is fixed to the upper magnetic yoke facing the peripheral flange of the movable plunger, and the upper magnetic yoke is fixed to the bottom surface of the lower magnetic yoke with respect to the plunger main body of the movable plunger. A return spring that applies a spring force in the direction of separation is disposed, and the peripheral flange is brought into contact with the auxiliary yoke fixed to the permanent magnet, thereby providing a predetermined gap between the released peripheral flange and the upper magnetic yoke. Provided.

When the exciting coil is energized, it passes from the plunger main body of the movable plunger through the peripheral flange portion, through the gap between the peripheral flange portion and the upper magnetic yoke, and the upper magnetic yoke, the lower magnetic yoke, the fixed plunger, and the plunger of the movable plunger. A closed magnetic path to the main body is formed.
Here, the magnetic flux generated in the gap between the peripheral flange portion and the upper magnetic yoke causes the peripheral flange portion to contact the upper magnetic yoke against the attractive force of the permanent magnet and the spring force of the return spring (movable plunger). Acting as a suction force), and the pair of fixed and movable contacts of the contact mechanism come into contact with each other, so that a current path is formed and the input state is established.

JP 2012-243583 A

By the way, in order to reduce the magnetic resistance in the closed magnetic path, the electromagnetic contactor of Patent Document 1 described above is arranged so that the lower outer periphery of the plunger main body of the movable plunger overlaps with a part of the cylindrical fixed plunger. .
Magnetic flux generated in a slight gap between the lower outer periphery of the plunger main body and the fixed plunger acts as an attractive force in a direction orthogonal to the driving direction of the movable plunger.
Thus, when a suction force in a direction orthogonal to the driving direction of the movable plunger acts, the plunger body may be inclined and the sliding part supporting the plunger body may be worn.

In addition, the movable contact is tilted together with the movable plunger by the action of the suction force, and the two contact gaps between the movable contact and the pair of fixed contacts may be unbalanced.
The present invention has been made in order to solve the above-described problem, and electromagnetic contact that can normally open and close the current path without affecting the operation of the movable plunger due to the generation of magnetic flux by excitation of the excitation coil. Provide a bowl.

  In order to achieve the above object, an electromagnetic contactor according to an aspect of the present invention includes a contact mechanism having a pair of fixed contacts and a movable contact that can be contacted with and separated from the pair of fixed contacts, and the contact mechanism. An electromagnet unit for driving, the electromagnet unit comprising: a movable plunger coupled to the movable contact; an excitation coil for generating magnetic flux by excitation to drive the movable plunger in a driving direction; and the excitation coil And a fixed plunger that is fixed to the magnetic yoke and faces the driving direction of the movable plunger, and the contact surface of the movable plunger and the fixed plunger has a driving direction of the movable plunger. It is formed facing.

  According to the electromagnetic contactor of the present invention, since the armature surfaces of the movable plunger and the fixed plunger are formed so as to face the driving direction of the movable plunger, they are generated on the armature surfaces of the movable plunger and the fixed plunger in the closed magnetic path. The direction of the magnetic flux to be generated is the direction along the driving direction of the movable plunger, and no attractive force that is orthogonal to the driving direction of the movable plunger is generated. Therefore, the current path can be normally opened and closed without affecting the operation of the movable plunger.

It is sectional drawing which shows the electromagnetic contactor of 1st Embodiment which concerns on this invention. It is a disassembled perspective view of the electromagnetic contactor of 1st Embodiment. It is sectional drawing which shows the electromagnet unit of 1st Embodiment. It is sectional drawing which shows the electromagnet unit of 2nd Embodiment which concerns on this invention. It is a perspective view which shows the shape of the fixed plunger of 2nd Embodiment. It is the schematic which shows the principal part of the closed magnetic circuit of 2nd Embodiment. It is sectional drawing which shows the electromagnet unit of 3rd Embodiment which concerns on this invention. It is a figure which shows the shape of the fixed plunger and cap of 3rd Embodiment. It is sectional drawing which shows the electromagnet unit of 4th Embodiment which concerns on this invention. It is a figure which shows the shape of the fixed plunger and cap of 4th Embodiment.

Embodiments of the present invention will be described below with reference to the drawings. Note that in each embodiment, the same components are denoted by the same reference numerals, and description thereof is omitted.
[First Embodiment]
The electromagnetic contactor according to the first embodiment of the present invention is shown in FIGS. 1 to 3. The electromagnetic contactor 1 includes a contact mechanism 2, an electromagnet unit 3 that drives the contact mechanism 2, and a contact mechanism 2. And a sealed housing chamber 4 for housing a connecting shaft 37 and a movable plunger 35, which will be described later.

  The contact mechanism 2 is housed in a contact mechanism housing case 5 that constitutes the housing chamber 4, and the contact mechanism housing case 5 closes a metallic rectangular tube 6 and the upper end of the rectangular tube 6. And a flat ceramic insulating substrate 7. The rectangular cylindrical body 6 has a flange portion 6 a that protrudes outward at a lower end portion, and the flange portion 6 a is sealed and joined to the upper surface of an upper magnetic yoke 8 that constitutes the storage chamber 4. A pair of through holes 7a and 7b are formed in the insulating substrate 7 at a predetermined interval. A metallization process is performed on the periphery of the through holes 7 a and 7 b on the upper surface of the insulating substrate 7 and the position where the rectangular tube 6 contacts on the lower surface of the insulating substrate 7.

  The contact mechanism 2 includes a pair of fixed contacts 23 and 24 (hereinafter referred to as a first conductor portion 21 and a second conductor portion 22) fixed to the insulating substrate 7 via a pair of conductor portions 21 and 22 (hereinafter referred to as a first conductor portion 21 and a second conductor portion 22). And the first fixed contact 23 and the second fixed contact 24), and the movable contact 25 arranged so as to be able to contact with and separate from the first fixed contact 23 and the second fixed contact 24. I have. The first conductor portion 21 is inserted and fixed in the through hole 7a of the insulating substrate 7, and the second conductor portion 22 is inserted and fixed in the through hole 7b of the insulating substrate 7.

  The first fixed contact 23 is a C-shaped conductive plate made of copper or the like in a side view, and includes an upper plate portion 23a extending outward along the lower surface of the insulating substrate 7, and an outer end portion of the upper plate portion 23a. An intermediate plate portion 23b extending downward and a lower plate portion 23c extending inward from the lower end portion of the intermediate plate portion 23b in parallel with the upper plate portion 23a are provided. The lower plate portion 23c includes a first contact 23d that extends below the movable contact 25 and contacts the first contact of the movable contact 25 on the upper surface thereof.

  On the other hand, the second fixed contact 24 is also a C-shaped conductive plate made of copper or the like in a side view, like the first fixed contact 23, and extends upward along the lower surface of the insulating substrate 7. 24a, an intermediate plate portion 24b extending downward from the outer end portion of the upper plate portion 24a, and a lower plate portion 24c extending inward from the lower end portion of the intermediate plate portion 24b in parallel with the upper plate portion 24a. . The lower plate portion 24c includes a second contact 24d that extends below the movable contact 25 and contacts the second contact of the movable contact 25 on the upper surface thereof.

Each of the first fixed contact 23 and the second fixed contact 24 is fixed to the first conductor portion 21 and the second conductor portion 22, respectively. As a fixing method thereof, brazing, screwing, or the like can be given. It is done.
A C-shaped magnetic material plate 28 is mounted so as to cover the inner surface of the intermediate plate portion 23b of the first fixed contact 23 and the inner surface of the intermediate plate portion 24b of the second fixed contact 24 as viewed from above. Yes. Thereby, the magnetic field generated by the current flowing through the intermediate plate portions 23b and 24b can be shielded.

  A synthetic resin insulating cover 26 that restricts the generation of arc is attached to the first fixed contact 23, and a synthetic resin insulating cover 27 that restricts the occurrence of arc is also attached to the second fixed contact 24. Has been. As a result, only the first contact 23 d on the upper surface side of the lower plate portion 23 c is exposed on the inner peripheral surface of the first fixed contact 23. Further, only the second contact 24 d on the upper surface side of the lower plate portion 24 c is exposed on the inner peripheral surface of the second fixed contact 24.

  The movable contact 25 is a conductive plate that is long in the left-right direction in FIG. 1 and made of copper or the like as a material. The movable contact 25 is disposed so that both ends are disposed in the first fixed contact 23 and the second fixed contact 24. Has been. The movable contact 25 is supported by a connecting shaft 37 fixed to a movable plunger 35 described later of the electromagnet unit 3. A through hole through which the connecting shaft 37 is inserted is formed at the center of the movable contact 25.

  A flange portion 37 a is formed to protrude outward at a substantially central portion in the vertical direction of the connecting shaft 37. The movable contact 25 is placed on the flange portion 37 a through the through hole from above the connecting shaft 37. Then, the contact spring 39 is inserted from above the connecting shaft 37, the fixing member 38 is inserted from above the connecting shaft 37 to the connecting shaft 37, and the upper end of the contact spring 39 is adjusted so as to obtain a predetermined urging force by the contact spring 39. It is stopped by the fixing member 38.

  The movable contact 25 is in a released state, and the first contact and the second contact at both ends are spaced apart from the first contact 23d of the first fixed contact 23 and the second contact 24d of the second fixed contact 24, respectively. Is kept apart. Further, the movable contact 25 is in the closing position, and the first contact and the second contact at both ends are respectively connected to the first contact 23d of the first fixed contact 23 and the second contact 24d of the second fixed contact 24, respectively. The contact spring 39 is set to contact at a predetermined contact pressure.

As shown in FIG. 1, an insulating cylinder portion 14 formed in a bottomed rectangular cylinder shape is disposed on the inner peripheral surface of the rectangular cylinder body 6 of the contact mechanism accommodation case 5. The insulating cylinder portion 14 has an insulating function to block the influence of the arc on the metal square cylinder body 6.
As shown in FIG. 1, the electromagnet unit 3 includes a U-shaped lower magnetic yoke 31 as viewed from the side, and a solid cylindrical fixed plunger 32 is provided at the center of the bottom plate portion of the lower magnetic yoke 31. It is fixed. The upper surface 32a of the fixed plunger 32 is formed as a flat surface orthogonal to the axial direction. A spool 33 is disposed outside the fixed plunger 32.

  The spool 33 protrudes radially outward from the upper end portion of the central cylindrical portion 33a, the central cylindrical portion 33a that passes through the fixed plunger 32, the lower flange portion 33b that protrudes radially outward from the lower end portion of the central cylindrical portion 33a. And an upper flange portion 33c. As shown in FIGS. 1 to 3, an exciting coil 34 is wound around a storage space formed by a central cylindrical portion 33a, a lower flange portion 33b, and an upper flange portion 33c of the spool 33.

A plate-like upper magnetic yoke 8 is fixed to the upper end serving as the open end of the lower magnetic yoke 31. A plunger through hole 8 a is formed at the center of the upper magnetic yoke 8.
Further, the upper surface 32a of the fixed plunger 32 disposed in the central cylindrical portion 33a of the spool 33 is formed as a flat surface, and the cap 9 formed of a non-magnetic material formed in a bottomed cylindrical shape on the upper surface 32a. The bottom of the is arranged.

A flange portion 9 a protruding outward in the radial direction provided at the open end of the cap 9 is sealed and bonded to the lower surface of the upper magnetic yoke 8. Thus, a sealed container (accommodating chamber 4) is formed in which the contact mechanism accommodating case 5 and the cap 9 are communicated with each other via the plunger through hole 8a of the upper magnetic yoke 8.
Inside the cap 9, a movable plunger 35 having a return spring 36 disposed at the bottom is accommodated so as to be movable in the vertical direction.

  The movable plunger 35 is accommodated in the cap 9 so as to be movable in the vertical direction, and has a hollow cylindrical plunger body 40 having the same diameter as the fixed plunger 32 and an upper portion having an outer diameter larger than that of the plunger through-hole 8a. And a peripheral flange portion 41 located above the magnetic yoke 8. The lower surface 40a of the plunger main body 40 is formed as a flat surface orthogonal to the axial direction. Here, the movable plunger 35 and the above-described fixed plunger 32 are arranged coaxially, and the upper surface 32 a of the fixed plunger 32 and the lower surface 40 a of the plunger main body 40 face each other in parallel via the bottom portion of the cap 9.

As shown in FIG. 3, on the axis line of the movable plunger 35, a fitting hole 43 into which the connecting shaft 37 is fitted and a spring housing hole 44 in which the return spring 36 is arranged are formed on the upper end side on the peripheral flange 41 side. Yes.
In addition, the armature surface of the movable plunger according to the present invention corresponds to the lower surface 40a of the plunger body 40, and the armature surface of the fixed plunger according to the present invention corresponds to the upper surface 32a of the fixed plunger 32.

As shown in FIGS. 1 and 2, the upper magnet yoke 8 has an upper surface 8 b on the upper surface 8 b of which a permanent magnet 11 having a square outer shape and a circular center opening is formed in an annular shape. 41 is fixed so as to surround it. The permanent magnet 11 is magnetized in the vertical direction, that is, in the thickness direction so that the upper end side is, for example, the N pole and the lower end side is the S pole.
On the upper surface of the permanent magnet 11, an auxiliary yoke 12 having the same outer shape as the permanent magnet 11 and having a through hole 12 a having an inner diameter smaller than that of the peripheral flange portion 41 of the movable plunger 35 is fixed.
An elastic plate-like foreign matter intrusion preventing member 13 is fixed to the upper surface of the auxiliary yoke 12.
A connecting shaft 37 that is inserted into the insertion hole 43 of the movable plunger 35 passes through the through hole 12 a of the auxiliary yoke 12 and the through hole 13 a of the foreign matter intrusion prevention member 13.

In the released state of the electromagnetic contactor 1 of the first embodiment, the movable plunger 35 is urged upward by the return spring 36, so that the upper surface of the peripheral flange portion 41 is in the released position where it abuts against the lower surface of the auxiliary yoke 12. In this state, the pair of contacts of the movable contact 25 are spaced apart from the contacts 23d and 24d of the first fixed contact 23 and the second fixed contact 24, and the current is cut off.
In this released state, the peripheral flange portion 41 of the movable plunger 35 is attracted to the auxiliary yoke 12 by the magnetic force of the permanent magnet 11, and the movable plunger 35 is inadvertently caused by external vibration, impact, etc. coupled with the urging force of the return spring 36. A state of contacting the auxiliary yoke 12 without moving downward is ensured.

In the released state, as shown in FIG. 3, a gap G1 is provided between the lower surface of the peripheral flange portion 41 of the movable plunger 35 and the upper surface 8b of the upper magnetic yoke 8, and the upper surface 32a of the fixed plunger 32 and the movable plunger 35 A gap G <b> 2 is provided between the lower surface 40 a of the plunger main body 40.
When the exciting coil 34 is excited in the released state, a gap G1 between the peripheral flange 41 and the upper magnetic yoke 8 passes through the peripheral flange 41 from the plunger body 40 of the movable plunger 35 as shown in FIG. It passes through the upper magnetic yoke 8 and passes from the upper magnetic yoke 8 through the U-shaped lower magnetic yoke 31 and the fixed plunger 32 to form a gap G2 between the upper surface 32a of the fixed plunger 32 and the lower surface 40a of the plunger body 40. A closed magnetic path that passes through to the plunger main body 40 of the movable plunger 35 is formed.

  This increases the magnetic flux density of the gap G1 between the lower surface of the peripheral flange portion 41 of the movable plunger 35 and the upper surface 8b of the upper magnetic yoke 8, and between the upper surface 32a of the fixed plunger 32 and the lower surface 40a of the plunger body 40. The magnetic flux density of the gap G1 is increased and a large attractive force is generated to lower the movable plunger 35 against the urging force of the return spring 36 and the attractive force of the permanent magnet 11.

Accordingly, the pair of movable contacts of the movable contact 25 connected to the movable plunger 35 via the connecting shaft 37 is brought into contact with the contacts 23d and 24d of the first fixed contact 23 and the second fixed contact 24, A current path from the first fixed contact 23 to the second fixed contact 24 through the movable contact 25 is formed and the input state is established.
Then, the upper magnetic yoke 8 is joined to the upper surface 8b of the upper magnetic yoke 8, and the contact mechanism housing case 5 for housing the contact mechanism 2 therein is joined to the lower surface of the upper magnetic yoke 8, with the movable plunger 35 inside. The cap 9 to be accommodated constitutes a sealed accommodation chamber 4 for accommodating the contact mechanism 2, the connecting shaft 37 and the movable plunger 35. A gas such as hydrogen gas, nitrogen gas, a mixed gas of hydrogen and nitrogen, air, or SF ₆ is sealed in the sealed storage chamber 4.

Next, operation | movement of the electromagnetic contactor 1 of 1st Embodiment is demonstrated.
Now, it is assumed that the first fixed contact 23 is connected to a power supply source that supplies a large current, for example, and the second fixed contact 24 is connected to a load.
In this state, it is assumed that the exciting coil 34 of the electromagnet unit 3 is in a non-excited state, and the electromagnet unit 3 is in a released state in which no attracting force for lowering the movable plunger 35 is generated. In this released state, the movable plunger 35 is urged upward by the return spring 36 away from the upper magnetic yoke 8.

At the same time, the attractive force due to the magnetic force of the permanent magnet 11 is applied to the auxiliary yoke 12, and the peripheral flange portion 41 of the movable plunger 35 is attracted. Therefore, the upper surface of the peripheral flange portion 41 of the movable plunger 35 is in contact with the lower surface of the auxiliary yoke 12.
Therefore, the contact of the movable contact 25 of the contact mechanism 2 connected to the movable plunger 35 via the connection shaft 37 is connected to the first and second contacts 23d and 24d of the first and second fixed contacts 23 and 24. It is spaced upward by a predetermined distance. For this reason, the current path between the first and second stationary contacts 23 and 24 is in a disconnected state, and the contact mechanism 2 is in an open state.

  When the exciting coil 34 of the electromagnet unit 3 is excited from this released state, the plunger main body 40 of the movable plunger 35 passes through the peripheral flange portion 41 and passes through the gap G1 between the peripheral flange portion 41 and the upper magnetic yoke 8. The magnetic yoke 8 is reached and is movable from the upper magnetic yoke 8 through the U-shaped lower magnetic yoke 31 and the fixed plunger 32 and through the gap G2 between the upper surface 32a of the fixed plunger 32 and the lower surface 40a of the plunger body 40. A closed magnetic path to the plunger main body 40 of the plunger 35 is formed.

At this time, the magnetic flux density is increased in the gap G <b> 1 between the peripheral flange portion 41 and the upper surface 8 b of the upper magnetic yoke 8, and an attractive force that pulls the peripheral flange portion 41 toward the upper magnetic yoke 8 acts.
Further, the magnetic flux density is increased in the gap G <b> 2 between the upper surface 32 a of the fixed plunger 32 and the lower surface 40 a of the plunger main body 40, and an attractive force that pulls the plunger main body 40 toward the fixed plunger 32 acts.
By such an attractive force acting, the movable plunger 35 is pushed downward against the urging force of the return spring 36 and the attractive force of the annular permanent magnet 11.

Then, the lowering of the movable plunger 35 is stopped when the lower surface of the peripheral flange portion 41 comes into contact with the upper surface 8 b of the upper magnetic yoke 8. Thus, when the movable plunger 35 is lowered, the movable contact 25 connected to the movable plunger 35 via the connecting shaft 37 is also lowered, and the contact of the movable contact 25 is the first and second fixed contacts. The first and second contacts 23d and 24d of 23 and 24 are brought into contact with the contact pressure of the contact spring 39.
Therefore, a closed state is reached in which a large current from the external power supply source is supplied to the load through the first fixed contact 23, the movable contact 25, and the second fixed contact 24.

Next, the effect of the electromagnetic contactor 1 of 1st Embodiment is demonstrated.
The magnetic contactor 1 of the first embodiment increases the magnetic flux density in the gap G1 between the circumferential flange 41 and the upper surface 8b of the upper magnetic yoke 8 by exciting the exciting coil 24, and the circumferential flange 41 is moved to the upper magnetic yoke. Since the attracting force attracted to 8 acts, the magnetic flux density increases in the gap G2 between the upper surface 32a of the fixed plunger 32 and the lower surface 40a of the plunger body 40, and the attracting force that attracts the plunger body 40 to the fixed plunger 32 acts. The movable plunger 35 can be pushed down to the upper surface 8 b side of the upper magnetic yoke 8 against a biasing force of the return spring 36 and an attractive force of the annular permanent magnet 11 by generating a large attractive force.

In the first embodiment, since the upper surface 32a of the fixed plunger 32 and the lower surface 40a of the plunger main body 40 face each other in parallel, the direction of the magnetic flux generated in the gap G2 between the upper surface 32a and the lower surface 40a is movable. This is a direction along the driving direction of the plunger 35 and does not generate a suction force orthogonal to the driving direction of the movable plunger 35 in which the ranger main body 40 is inclined as in the conventional structure. Accordingly, the drive gap of the movable plunger 35 is not affected, and the contact gap between the pair of fixed contacts 23 and 24 and the movable contact 25 can always be set constant.
In the first embodiment, since the fixed plunger 32 is disposed inside the central cylindrical portion 33a of the spool 33, the outer diameter of the fixed plunger 32 is smaller than that of the conventional structure. The winding space of the exciting coil 34 can be widened.

[Second Embodiment]
Next, the electromagnet unit 50 of 2nd Embodiment of the electromagnetic contactor 1 which concerns on this invention is demonstrated with reference to FIGS.
As shown in FIG. 4, in the electromagnet unit 50 of the second embodiment, the fixed plunger 51 is fixed to the center of the bottom plate portion of the lower magnetic yoke 31 of the spool 33, and the spool 33 is outside the fixed plunger 51. Has been placed.
The fixed plunger 51 has a solid cylindrical shape, and as shown in FIG. 5, the upper portion is formed in a truncated cone shape protruding outward in the axial direction, and a tapered peripheral surface 51a is formed.
The bottom 9 b of the cap 9 that is in contact with the tapered peripheral surface 51 a of the fixed plunger 51 is also formed in a truncated cone shape that is recessed inward in the axial direction, and is in surface contact with the upper portion of the fixed plunger 51.

Inside the cap 9, a plunger main body 40 of a movable plunger 35 having a return spring 36 disposed at the lowermost portion is accommodated.
The lower portion of the plunger main body 40 is formed as a truncated cone shape recessed inward in the axial direction, and a tapered peripheral surface 40b is formed.
The tapered peripheral surface 51 a of the fixed plunger 51 and the tapered peripheral surface 40 b of the plunger main body 40 face each other in parallel via the bottom 9 b of the cap 9.

Here, in the second embodiment, the gap G2 set between the upper surface 32a of the fixed plunger 32 and the lower surface 40a of the plunger main body 40 in the first embodiment is tapered as shown in FIG. The distance between the circumferential surface 51a and the tapered circumferential surface 40b of the plunger body 40 is set at a distance away from each other in the axial direction.
The armature contact surface of the movable plunger according to the present invention corresponds to the taper peripheral surface 40 b of the plunger body 40, and the armature contact surface of the fixed plunger according to the present invention corresponds to the taper peripheral surface circumference 51 a of the fixed plunger 51. .

  When the exciting coil 34 of the electromagnet unit 50 is excited in the released state, the electromagnetic contactor 1 of the second embodiment passes from the plunger main body 40 of the movable plunger 35 through the peripheral flange 41 and passes through the peripheral flange 41 and the upper magnetic yoke 8. The upper magnetic yoke 8 is passed through the gap G1 between the upper magnetic yoke 8 and the U-shaped lower magnetic yoke 31 and the fixed plunger 51, and the tapered peripheral surface 51a of the fixed plunger 51 is parallel to each other. A closed magnetic path that reaches the plunger main body 40 of the movable plunger 35 through a direction orthogonal to the tapered peripheral surface 40b of the plunger main body 40 is formed.

As shown in FIG. 6, between the taper peripheral surface 51a of the fixed plunger 51 and the taper peripheral surface 40b of the plunger body 40 orthogonal to each other, the taper peripheral surface 51a and the taper peripheral surface 40b are in the axial direction. The gap G3 is smaller than the separated gap G2 (G3 <G2).
Thereby, the magnetic flux density is increased in the gap G3 between the tapered peripheral surface 51a of the fixed plunger 51 and the tapered peripheral surface 40b of the plunger main body 40, and the attraction force that pulls the plunger main body 40 toward the fixed plunger 32 is greater than that of the first embodiment. Acts with great force.

Therefore, in the magnetic contactor 1 of the second embodiment, the magnetic flux density is increased in the gap G1 between the peripheral flange portion 41 and the upper surface 8b of the upper magnetic yoke 8 by the excitation of the excitation coil 24, and the peripheral flange portion 41 is moved upward. A magnetic force is attracted to the magnetic yoke 8, and the magnetic flux density is increased in the gap G <b> 3 between the tapered peripheral surface 51 a of the fixed plunger 51 and the tapered peripheral surface 40 b of the plunger main body 40, and the plunger main body 40 is attracted to the fixed plunger 51. A large attractive force acts, and the movable plunger 35 can be pushed down toward the upper surface 8 b of the upper magnetic yoke 8 against the urging force of the return spring 36 and the attractive force of the annular permanent magnet 11 by generating a large attractive force. .
In the second embodiment, since the fixed plunger 51 is arranged inside the central cylindrical portion 33a of the spool 33, the outer diameter of the fixed plunger 51 is smaller than that of the conventional structure, and the spool 33 The winding space of the exciting coil 34 can be widened.

[Third Embodiment]
Next, the electromagnet unit 60 of 3rd Embodiment of the electromagnetic contactor 1 which concerns on this invention is demonstrated with reference to FIG.7 and FIG.8.
In the electromagnet unit 60 of the third embodiment, a circular through hole 9 c is formed at the bottom of the cap 9.
A solid cylindrical fixed plunger 61 is fixed to the central portion of the bottom plate portion of the lower magnetic yoke 31, and a spool 33 is disposed outside the fixed plunger 61.
A reduced diameter portion 62 is formed to protrude from the upper portion of the fixed plunger 61, and an upper surface 62a of the reduced diameter portion 62 is formed as a flat surface orthogonal to the axial direction.

The lower surface 40a of the plunger main body 40 inserted into the cap 9 is also formed as a flat surface orthogonal to the axial direction.
The lower end of the return spring 36 housed in the spring housing hole 44 of the plunger main body 40 is in contact with the upper surface 62 a of the reduced diameter portion 62 of the fixed plunger 61.
The flange portion 9 a of the cap 9 is sealed and joined to the lower surface of the upper magnetic yoke 8, and the inner periphery of the through hole 9 c formed in the bottom portion of the cap 9 is sealed and joined to the periphery of the reduced diameter portion 62 of the fixed plunger 61. Yes.

As a result, a sealed container (accommodating chamber 4) in which the contact mechanism accommodating case 5 and the cap 9 are communicated with each other via the plunger through hole 8a of the upper magnetic yoke 8 is formed, and the reduced diameter portion 62 is formed inside the accommodating chamber 4. The upper surface 62a is located.
Here, in the third embodiment, the gap G2 set between the upper surface 32a of the fixed plunger 32 and the lower surface 40a of the plunger body 40 in the first embodiment is reduced as shown in FIG. The distance is set such that the lowest position of the diameter portion 62 and the lower surface 40a of the plunger main body 40 are separated in the axial direction.
The armature surface of the movable plunger according to the present invention corresponds to the lower surface 40 a of the plunger body 40, and the armature surface of the fixed plunger according to the present invention corresponds to the upper surface 62 a of the fixed plunger 61.

  When the excitation coil 34 of the electromagnet unit 60 is excited in the released state, the electromagnetic contactor 1 of the third embodiment passes from the plunger main body 40 of the movable plunger 35 through the peripheral flange 41 and passes through the peripheral flange 41 and the upper magnetic yoke 8. Through the gap G1 between the upper magnetic yoke 8 and the upper magnetic yoke 8, the U-shaped lower magnetic yoke 31 and the fixed plunger 61, and the fixed plunger positioned inside the storage chamber 4. A closed magnetic path that reaches the plunger main body 40 of the movable plunger 35 through the gap G4 between the upper surface 62a of the reduced diameter portion 62 of the 61 and the lower surface 40a of the plunger main body 40 is formed.

  The gap G4 between the upper surface 62a of the reduced diameter portion 62 of the fixed plunger 61 and the lower surface 40a of the plunger body 40 is such that the lowermost position of the reduced diameter portion 62 of the fixed plunger 61 and the lower surface 40a of the ranger body 40 are in the axial direction. Since the gap G2 is smaller than the separated gap G2, the magnetic flux density is increased in the gap G4 between the upper surface 62a of the fixed plunger 61 and the lower surface 40a of the plunger body 40, and the attraction force that pulls the plunger body 40 toward the fixed plunger 61 is the first implementation. Acts with greater force than form.

Therefore, in the magnetic contactor 1 of the third embodiment, the magnetic flux density is increased in the gap G1 between the peripheral flange portion 41 and the upper surface 8b of the upper magnetic yoke 8 by the excitation of the excitation coil 24, and the peripheral flange portion 41 is moved upward. While the attractive force attracted to the magnetic yoke 8 acts, the magnetic flux density is generated in the gap G4 between the upper surface 62a of the reduced diameter portion 62 of the fixed plunger 61 and the lower surface 40a of the plunger body 40 which are located inside the storage chamber 4. A large attraction force that pulls the plunger main body 40 toward the fixed plunger 61 acts, and the movable plunger 35 generates a large attraction force to resist the biasing force of the return spring 36 and the attraction force of the annular permanent magnet 11, and the upper magnetism. The yoke 8 can be pushed down to the upper surface 8b side.
Also in the third embodiment, since the fixed plunger 61 is arranged inside the central cylindrical portion 33a of the spool 33, the outer diameter of the fixed plunger 61 is smaller than that of the conventional structure, and the spool 33 The winding space of the exciting coil 34 can be widened.

[Fourth Embodiment]
Furthermore, the electromagnet unit 70 of 4th Embodiment of the electromagnetic contactor which concerns on this invention is demonstrated with reference to FIG.9 and FIG.10.
The electromagnet unit 70 of the fourth embodiment also has a circular through hole 9 c formed at the bottom of the cap 9.
A solid cylindrical fixed plunger 71 is fixed to the center of the bottom plate portion of the lower magnetic yoke 31, and a spool 33 is disposed outside the fixed plunger 71.
A diameter-reduced portion 72 projects from the upper portion of the fixed plunger 71. The diameter-reduced portion 72 is formed in a truncated cone shape and has a tapered peripheral surface 72a.

The lower part of the plunger main body 40 inserted into the cap 9 is also formed as a truncated cone shape recessed inward in the axial direction, and a tapered peripheral surface 40b is formed.
The lower end of the return spring 36 housed in the spring housing hole 44 of the plunger body 40 is in contact with the upper surface of the reduced diameter portion 72 of the fixed plunger 71.
The flange 9 a of the cap 9 is sealed and joined to the lower surface of the upper magnetic yoke 8, and the inner periphery of the through hole 9 c formed in the bottom of the cap 9 is sealed and joined to the periphery of the reduced diameter portion 72 of the fixed plunger 71. Yes.

As a result, the tapered peripheral surface 72 a of the reduced diameter portion 72 is located inside the storage chamber 4.
Here, in the fourth embodiment, the gap G2 set between the upper surface 32a of the fixed plunger 32 and the lower surface 40a of the plunger body 40 in the first embodiment is reduced as shown in FIG. The lowermost position of the diameter portion 72 and the tapered peripheral surface 40b of the plunger main body 40 are set to a distance that is separated in the axial direction.
The contact surface of the movable plunger according to the present invention corresponds to the tapered peripheral surface 40b of the plunger body 40, and the contact surface of the fixed plunger according to the present invention corresponds to the tapered peripheral surface 72a of the fixed plunger 71.

  When the electromagnetic contactor 1 of the fourth embodiment is energized with the exciting coil 34 of the electromagnet unit 70 in the released state, it passes from the plunger main body 40 of the movable plunger 35 through the peripheral flange 41 and passes through the peripheral flange 41 and the upper magnetic yoke 8. Through the gap G1 between the upper magnetic yoke 8 and the upper magnetic yoke 8, the U-shaped lower magnetic yoke 31 and the fixed plunger 61, and the fixed plunger positioned inside the storage chamber 4. A closed magnetic path is formed that reaches the plunger main body 40 of the movable plunger 35 through a gap G5 in a direction in which the tapered peripheral surface 72a of the 71 diameter-reduced portion 72 and the tapered peripheral surface 40b of the plunger main body 40 are orthogonal to each other.

Also in the fourth embodiment, the magnetic flux density is increased in the gap G1 between the peripheral flange portion 41 and the upper surface 8b of the upper magnetic yoke 8 by the excitation of the excitation coil 24, and the peripheral flange portion 41 is attracted to the upper magnetic yoke 8. As the force acts, the magnetic flux density increases in the gap G5 between the tapered peripheral surface 72a of the reduced diameter portion 72 of the fixed plunger 71 and the tapered peripheral surface 40b of the plunger main body 40, which are located inside the storage chamber 4, A large attraction force that pulls the plunger main body 40 toward the fixed plunger 71 acts, causing the movable plunger 35 to generate a large attraction force and resist the biasing force of the return spring 36 and the attraction force of the annular permanent magnet 11. Can be pushed down to the upper surface 8b side.
Also in the fourth embodiment, since the fixed plunger 71 is disposed inside the central cylindrical portion 33a of the spool 33, the outer diameter of the fixed plunger 61 is smaller than that of the conventional structure, and the spool 33 The winding space of the exciting coil 34 can be widened.

DESCRIPTION OF SYMBOLS 1 Electromagnetic contactor 2 Contact mechanism 3 Electromagnet unit 4 Storage chamber 5 Contact mechanism storage case 6 Square cylinder 6a Flange part 7 Insulating substrate 7a Through hole 7b Through hole 8 Upper magnetic yoke 8a Movable plunger through hole 8b Upper surface 9 of upper magnetic yoke Cap 9a Flange 9b Cap bottom 9c Cap through-hole 11 Permanent magnet 12 Auxiliary yoke 12a Through-hole 13 Foreign matter intrusion prevention member 13a Through-hole 14 Insulating cylinder 21 Conductor 22 Conductor 23 First fixed contact 23a Upper plate 23b Intermediate plate portion 23c Lower plate portion 23d First contact 24 Second fixed contact 24a Upper plate portion 24b Intermediate plate portion 24c Lower plate portion 24d Second contact 25 Movable contact 26 Insulating cover 27 Insulating cover 28 Magnetic plate 31 Lower portion Magnetic yoke 32 Fixed plunger 32a Fixed plunger upper surface 32b Rising portion 33 Spool 33 Central cylindrical portion 33b Lower flange portion 33c Upper flange portion 34 Excitation coil 35 Movable plunger 36 Return spring 37 Connecting shaft 37a Flange portion 38 Fixed member 39 Contact spring 40 Plunger body 40a Plunger body lower surface 40b Plunger body taper circumferential surface 41 Part 43 Insertion hole 44 Spring storage hole 50, 60, 70 Electromagnet units 51, 61, 71 Fixed plunger 51a, 72a Tapered peripheral surface 62, 72 of fixed plunger Reduced diameter part 62a Upper surface G1 of reduced diameter part Circumferential flange part of movable plunger G2, G3, G4, G5 between the yoke surface of the magnetic yoke and the magnetic yoke Gap between the fixed plunger and the plunger body

Claims (5)

A contact mechanism having a pair of fixed contacts and a movable contact that can be contacted with and separated from the pair of fixed contacts; and an electromagnet unit that drives the contact mechanism;
The electromagnet unit includes a movable plunger connected to the movable contact, an excitation coil that generates magnetic flux by excitation to drive the movable plunger in a driving direction, a magnetic yoke that surrounds the excitation coil, and a magnetic yoke A fixed plunger fixed to the yoke and facing in the driving direction of the movable plunger,
The contactor surfaces of the movable plunger and the fixed plunger are formed so as to face the driving direction of the movable plunger.   The electromagnetic contactor according to claim 1, wherein the armature surfaces of the movable plunger and the fixed plunger are formed as surfaces orthogonal to a driving direction of the movable plunger.   The electromagnetic contactor according to claim 1, wherein the armature surfaces of the movable plunger and the fixed plunger are formed as surfaces inclined with respect to a driving direction of the movable plunger.   The electromagnetic contactor according to any one of claims 1 to 3, wherein the movable plunger and the fixed plunger are arranged inside a central cylindrical portion around which the exciting coil is wound.   A cap made of a bottomed cylinder is disposed so as to cover at least the end of the movable plunger on the fixed plunger side, and the pair of fixed contacts, the movable contact and the movable plunger are sealed in a gas sealing region. In addition, at least the armature surface of the fixed plunger is disposed in the gas sealing region and is opposed to the armature surface of the movable plunger. The described magnetic contactor.

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