JP7414024B2 - electromagnetic contactor - Google Patents

Description

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

As an electromagnetic contactor that opens and closes a current path, for example, the one described in Patent Document 1 is known (in Cited Document 1, it is called a relay).

The electromagnetic contactor of Patent Document 1 includes a contact device, an electromagnet unit (referred to as a drive device in Document 1), and a housing made of an insulator that houses the contact device and the electromagnet unit.

The contact device includes a pair of fixed contacts having fixed contacts, a movable contact having a pair of movable contacts that can be brought into and out of contact with the fixed contacts, and a drive shaft connected to the movable contacts. The electromagnet unit includes a movable core that is connected to the drive shaft of the contact device and that moves the movable contact so that the fixed contact and the movable contact come into contact with and separate from each other, and an electromagnetic coil that moves the movable core. In the housing, a first storage chamber and a second storage chamber are formed with a partition wall therebetween, and the partition wall is provided with a communication path that communicates the first storage chamber and the second storage chamber.

The fixed contact and the movable contact of the contact device are arranged in the first storage chamber, and the drive shaft of the contact device extends from the first storage chamber through the communication path to the second storage chamber, A movable core of the electromagnet unit is arranged in the second storage chamber.

JP2020-87538A

When the contact mechanism of an electromagnetic contactor performs opening/closing operations and the pair of movable contacts of the movable contact comes into contact with the fixed contacts of the pair of fixed contacts, foreign matter such as abrasion powder, soot, and melted particles are generated. .

The electromagnetic contactor of Patent Document 1 reduces the gap between the drive shaft and the communication path (referred to as the first gap in Patent Document 1), so that foreign matter generated in the first storage chamber is transferred to the second storage chamber. By preventing the intrusion into the electromagnet, the driving operation of the electromagnet unit can be performed stably.

By the way, when the contact mechanism 4 shifts from the closed state to the open state, the drive shaft may oscillate, and as mentioned above, the gap between the drive shaft and the communication path is increased to prevent foreign matter from entering. If it is made small, there is a risk that the drive shaft with axial run-out will come into contact with the inner surface of the communication path, which will adversely affect the opening/closing operation of the contact mechanism.

Therefore, the present invention is capable of stably opening and closing the contact mechanism even if the drive shaft oscillates, and by preventing foreign matter from entering the electromagnet unit side, the drive operation of the electromagnet unit can be stabilized. The purpose is to provide an electromagnetic contactor that can perform

In order to achieve the above object, an electromagnetic contactor according to one aspect of the present invention includes a pair of fixed contacts having fixed contacts, a movable contact having a pair of movable contacts that can make contact with and separate from the fixed contacts, and a movable contactor. an electromagnet unit having a movable plunger connected via the drive shaft in a direction in which a movable contact approaches and separates from a fixed contact, and an accommodating housing that accommodates the contact mechanism and the movable plunger. The housing space includes a contact mechanism housing space for housing the contact mechanism and a movable plunger housing space for housing the movable plunger, which are partitioned by a partition member, and the drive shaft is inserted into the through hole formed in the partition member. A foreign matter intrusion prevention member, which is inserted through and connected to the movable contact and the movable plunger and closes the gap between the outer periphery of the drive shaft and the through hole of the partition member, closes the gap between the outer periphery of the drive shaft and the partition member when the drive shaft is in an axial deflection state. The foreign matter intrusion prevention member is slidably disposed on the member, and is pressed toward the partition member by the pressing member to close the gap. Here, the foreign matter is abrasion powder, soot, and molten scattered particles that are generated when a movable contact contacts a fixed contact of a contact mechanism.

In the electromagnetic contactor of the present invention, the foreign matter intrusion prevention member that closes the gap between the outer periphery of the drive shaft and the through hole of the partition member can freely slide on the outer periphery of the drive shaft and the partition member when the drive shaft is in a state of axial vibration. This prevents foreign matter from entering the electromagnet unit even if the drive shaft oscillates, and also allows stable opening/closing of the contact mechanism and driving of the electromagnet unit. .

FIG. 1 is a sectional view showing an electromagnetic contactor according to an embodiment of the present invention. 1 is a diagram showing main parts of an embodiment according to the present invention.

Next, embodiments according to the present invention will be described with reference to the drawings. In the description of the drawings below, the same or similar parts are designated by the same or similar symbols. However, it should be noted that the drawings are schematic and the relationship between thickness and planar dimensions, the ratio of the thickness of each layer, etc. are different from reality. Therefore, the specific thickness and dimensions should be determined with reference to the following explanation. Furthermore, it goes without saying that the drawings include portions with different dimensional relationships and ratios.

In addition, the plurality of embodiments shown below exemplify devices and methods for embodying the technical idea of the present invention. , arrangement etc. are not specified as below. The technical idea of the present invention can be modified in various ways within the technical scope defined by the claims.

In addition, "top", "bottom", "left", "right", "bottom", "front", "back", "long direction", "short direction", etc. described in the following explanations Directional terms are used with reference to the orientation of the accompanying drawings.

1 and 2 show an electromagnetic contactor according to an embodiment of the present invention.

FIG. 1 is a sectional view showing an electromagnetic contactor 1 according to the present embodiment, and the electromagnetic contactor 1 includes a contact mechanism 4 and an electromagnet unit 5 that drives the contact mechanism 4.

The contact mechanism 4 is housed in a contact storage case 6. The contact storage case 6 includes a rectangular cylinder 7 made of metal, and an insulating substrate 8 made of an insulating material such as ceramic or synthetic resin, which closes the upper end of the rectangular cylinder 7.

The rectangular cylinder body 7 is fixed in a state in which a rectangular cylinder flange portion 7a formed at the lower part is sealed and joined to an upper magnetic yoke 21 of the electromagnet unit 5, which will be described later. Through holes 9 and 10 are formed in the insulating substrate 8 at a predetermined interval.

The contact mechanism 4 includes a pair of fixed contacts 13 and 14 (hereinafter referred to as a first fixed contact 13 and a second fixed contact 14) fixed to an insulating substrate 8 via conductor parts 11 and 12, The first and second fixed contacts 13 and 14 are provided with a movable contact 15 having first and second fixed contacts 13a and 14a and first and second movable contacts 15a and 15b facing each other.

The first fixed contact 13 is a conductive plate made of a conductive material and has a C-shape in side view, and is spaced apart from both ends of the movable contact 15 in the longitudinal direction. Fixed through.

The first fixed contact 13 is arranged on the first movable contact 15a side of the movable contact 15, faces the first movable contact 15a of the movable contact 15 from below, and has the first fixed contact 13a on the upper surface. A first conductive plate part 13b provided, a second conductive plate part 13c bent from an end of the first conductive plate part 13b remote from the movable contact 15 and extending upward, and a second conductive plate part 13c. A third conductive plate portion 13d is bent from the upper end of the movable contact 13c and extends above the movable contact 15.

Further, the second fixed contact 14 is arranged on the second movable contact 15b side of the movable contact 15, faces the second movable contact 15b of the movable contact 15 from below, and connects the second fixed contact 14a. A first conductive plate portion 14b provided on the upper surface, a second conductive plate portion 14c bent from the end of the first conductive plate portion 14b remote from the movable contact 15 and extending upward, and a second conductive plate portion 14c provided on the upper surface. A third conductive plate portion 14d is bent from the upper end of the plate portion 14c and extends above the movable contact 15.

An arc barrier 16 made of synthetic resin is attached to the first fixed contact 13 to restrict the generation of arc. The second fixed contact 14 is also equipped with an arc barrier 17 made of synthetic resin that restricts the generation of arc. As a result, the first fixed contact 13a and the first conductive plate part 13b are exposed on the inner peripheral surface of the first fixed contact 13, and the second fixed contact 14a and the first conductive plate part 13b are exposed on the inner peripheral surface of the second fixed contact 14. 1 conductive plate portion 14b is exposed.

Further, a C-shaped magnetic body is provided so as to cover the inner surface of the second conductive plate portion 13c of the first fixed contact 13 and the inner surface of the second conductive plate portion 14c of the second fixed contact 14. Plates 19a and 19b are attached. Thereby, the magnetic field generated by the current flowing through the second conductive plate portions 13c and 14c can be shielded.

The movable contact 15 is a linear conductive plate made of a conductive material and elongated in the left-right direction in FIG. A first movable contact 15a and a second movable contact 15b are formed on the lower surfaces of both ends.

A circular drive shaft flange portion 25 that protrudes outward is formed at the center in the longitudinal direction of the drive shaft 23. By inserting the drive shaft 23 into the through hole 24 of the movable contact 15, the movable contact The lower central portion of the child 15 abuts the drive shaft flange portion 25, and the contact spring 26 is inserted from the top of the drive shaft 23. The upper end of the contact spring 26 is fixed by a spring receiver 27a fixed to the upper end of the drive shaft 23 and a C ring 27b, so that the contact spring 26 applies a predetermined biasing force to the movable contactor 15. .

The electromagnet unit 5 has a flat U-shaped lower magnetic yoke 28 when viewed from the side, a fixed plunger 29 is disposed in the center of the bottom plate of the lower magnetic yoke 28, and a spool is disposed on the outside of the fixed plunger 29. 30 are arranged.

The spool 30 includes a central cylindrical portion 31 through which the fixed plunger 29 is inserted, a lower flange portion 32 that protrudes radially outward from the lower end of the central cylindrical portion 31, and a lower flange portion 32 extending from slightly below the upper end of the central cylindrical portion 31. The upper flange portion 33 protrudes outward in the radial direction. An excitation coil 34 is wound around a storage space constituted by the central cylindrical portion 31, the lower flange portion 32, and the upper flange portion 33.

The upper magnetic yoke 21 fixed to the open upper end of the lower magnetic yoke 28 has a through hole 21a formed in the center thereof facing the central cylindrical portion 31 of the spool 30.

The upper part of the fixed plunger 29 inserted into the central cylindrical part 31 of the spool 30 is covered with a cap 35 formed in the shape of a cylinder with a bottom, and a cap 35 is formed extending radially outward at the open end of the cap 35. A flange portion 35a is arranged. This flange portion 35a is sealed and joined to the lower surface of the upper magnetic yoke 21.

A cylindrical plunger body 22a constituting the movable plunger 22 is inserted into the cap 35 so as to be vertically slidable. The movable plunger 22 has a peripheral flange 22b that projects radially outward from the upper end of a plunger body 22a that projects upward from the upper magnetic yoke 21.

A driving permanent magnet 37 formed in an annular shape is fixed to the upper surface of the upper magnetic yoke 21 so as to surround the peripheral flange 22b of the movable plunger 22. This driving permanent magnet 37 is magnetized in the vertical direction, that is, in the thickness direction, so that, for example, the upper end side is the north pole and the lower end side is the south pole.

An auxiliary yoke 39 is fixed to the upper end surface of the driving permanent magnet 37, and has a through hole 38 having the same outer diameter as the driving permanent magnet 37 and an inner diameter smaller than the outer diameter of the peripheral flange 22b of the movable plunger 22. The peripheral flange portion 22b of the movable plunger 22 comes into contact with the lower surface of the auxiliary yoke 39.

Then, the return spring 36 and washer 40 are inserted from below the drive shaft 23, and with one end of the return spring 36 in contact with the drive shaft flange portion 25 and the other end of the return spring 36 in contact with the washer 40, the drive A return spring 36 and a washer 40 are attached to the outer periphery of the shaft 23.

Then, when the lower part of the drive shaft 23 equipped with the return spring 36 and the washer 40 is inserted into the through hole 38 of the auxiliary yoke 39 and fixed after being inserted into the movable plunger 22, the return spring 36 is inserted into the drive shaft of the drive shaft 23. It is arranged between the flange portion 25 and the washer 40. The return spring 36 exerts a predetermined biasing force in a direction that presses the washer 40 and the auxiliary yoke 39 against the driving permanent magnet 37.

As shown in FIG. 2, the washer 40 attached to the outer periphery of the drive shaft 23 is set so that the inner diameter of the through hole a is slightly larger than the outer diameter of the drive shaft 23. Further, the washer 40 is in contact with the upper surface of the auxiliary yoke 39 under the urging force of the return spring 36 while closing the gap between the drive shaft 23 and the through hole 38 .

The upper surface opening of the peripheral flange portion 22b of the movable plunger 22 through which the drive shaft 23 is inserted is formed with a tapered surface 22c whose diameter decreases downward.

A concave ring-shaped foreign matter collection pocket 41 whose diameter is reduced by a predetermined length in the axial direction is formed on the outer circumference of the drive shaft 23 facing the tapered surface 22c.

Returning to FIG. 1, an insulating holder 18 in the shape of a cylinder with a bottom is arranged inside the contact storage case 6. The insulating holder 18 is made of an insulating synthetic resin that generates hydrogen gas when melted. The insulating holder 18 includes a cylindrical insulating wall 18a extending along the inside of the rectangular cylinder 7 of the contact storage case 6, an upper magnetic yoke 21, and a driving permanent magnet 36 formed at the lower part of the cylindrical insulating wall 18a. and an insulating bottom 18b that covers the upper surface of the auxiliary yoke 39. The insulating bottom 18b is formed with an insertion hole 18c into which the drive shaft 23 and a return spring 36 attached to the outer periphery of the drive shaft 23 are loosely inserted.

An insulating holder fixing spring 42 is disposed between the lower surface of the insulating bottom 18b of the insulating holder 18 and the upper surface of the auxiliary yoke 39. This spring 42 for fixing the insulating holder is fixed by pressing a part of the insulating bottom 18b against the first conductive plate portions 13b and 14b of the first and second fixed contacts 13 and 14 with a predetermined urging force. This is a member for fixing to the insulating substrate 8 side.

The upper magnetic yoke 21 having the through hole 21a formed therein, the contact storage case 6 which is joined to the upper surface of the upper magnetic yoke 21 and houses the contact mechanism 4 inside, and the contact storage case 6 which is joined to the lower surface of the upper magnetic yoke 21 and has an internal structure. The cap 35 that accommodates the plunger body 22a of the movable plunger 22 forms a sealed accommodation space R that accommodates the contact mechanism 4, the drive shaft 23, and the movable plunger 22. Gases such as hydrogen gas, nitrogen gas, a mixed gas of hydrogen and nitrogen, air, and SF ₆ are sealed in this sealed storage chamber R.

The accommodation space R is partitioned into a contact mechanism accommodation space R1 that accommodates the contact mechanism 4 and a movable plunger accommodation space R2 that accommodates the movable plunger 22 by a partition member through which the drive shaft 23 is inserted.

The above-mentioned partition member includes an upper magnetic yoke 21, a driving permanent magnet 37, an auxiliary yoke 39 having a through hole 38 through which the driving shaft 23 is inserted, and an upper surface of the auxiliary yoke 39 that is attached to the outer periphery of the driving shaft 23. The washer 40 contacts the drive shaft 23 and closes the gap between the drive shaft 23 and the through hole 38.

Next, the operation and effect of the electromagnetic contactor 1 of this embodiment will be explained.

It is now assumed that the excitation coil 34 of the electromagnet unit 5 is in a non-excited state and is in a released state in which the electromagnet unit 5 does not generate an excitation force to lower the movable plunger 22.

In this released state, the movable plunger 22 is urged upward away from the upper magnetic yoke 21 by the return spring 36. At the same time, an attractive force due to the magnetic force of the driving permanent magnet 37 acts on the auxiliary yoke 39, and the peripheral flange 22b of the movable plunger 22 is attracted. Therefore, the upper surface of the peripheral flange portion 22b of the movable plunger 22 is in contact with the lower surface of the auxiliary yoke 39.

The first movable contact 15 a and the second movable contact 15 b of the movable contact 15 of the contact mechanism 4 connected to the movable plunger 22 via the drive shaft 23 are connected to the first fixed contact 13 a and the second movable contact 15 b of the first fixed contact 13 . It is spaced apart from the second fixed contact 14a of the two fixed contacts 14. Thereby, the current path between the first fixed contact 13 and the second fixed contact 14 is in a cutoff state, and the contact mechanism 4 is in an open state.

When the contact mechanism 4 is in an open state, when the excitation coil 34 of the electromagnet unit 5 is energized, an excitation force is generated in the electromagnet unit 5, and the movable plunger 22 is moved by the urging force of the return spring 36 and the attraction of the driving permanent magnet 37. Push down against the force. The downward movement of the movable plunger 22 is stopped when the lower surface of the peripheral flange portion 22b hits the upper surface of the upper magnetic yoke 21.

In this way, as the movable plunger 22 descends, the movable contact 15 connected to the movable plunger 22 via the drive shaft 23 also descends, and the first movable contact 15a of the movable contact 15 of the contact mechanism 4, The second movable contact 15b contacts the first fixed contact 13a of the first fixed contact 13 and the second fixed contact 14a of the second fixed contact 14 by the contact pressure of the contact spring 26.

Therefore, a large current from the power supply source is supplied to the load device through the first fixed contact 13, the movable contact 15, and the second fixed contact 14, resulting in a closed state.

When the current supply to the load device is cut off from the closed state of the contact mechanism 4, the excitation to the excitation coil 34 of the electromagnet unit 5 is stopped.

When the excitation to the excitation coil 34 is stopped, the excitation force for moving the movable plunger 22 downward by the electromagnet unit 5 disappears, and the movable plunger 22 is raised by the biasing force of the return spring 36, and the peripheral flange portion 22b is moved upwardly by the auxiliary yoke. 39, the attractive force of the driving permanent magnet 37 increases.

As the movable plunger 22 rises, the movable contact 15 connected via the drive shaft 23 rises. When contact pressure is applied by the contact spring 26 in accordance with this, the first movable contact 15a and the second movable contact 15b of the movable contact 15 are connected to the first fixed contact 13a and the second fixed contact of the first fixed contact 13. It is in contact with the second fixed contact 14a of the contactor 14. Thereafter, when the lower surface of the central part of the movable contact 15 comes into contact with the drive shaft flange 25 of the rising drive shaft 23, the movable contact 15 is moved against the first fixed contact 13 and the second fixed contact 14. It becomes an open state (released state) in which it is spaced upward.

Here, when the contact mechanism 4 repeats the open state and the closed state, the first movable contact 15a and the second movable contact 15b of the movable contact 15 and the first fixed contact 13a and the first fixed contact 13a of the first fixed contact 13 Foreign matter such as abrasion powder, soot, and molten scattered particles is generated between the two fixed contacts 14 and the second fixed contacts 14a.

When this foreign object passes through the insertion hole 18c of the insulating holder 18 and attempts to move toward the movable plunger 22 from the gap between the drive shaft 23 and the through hole 38 of the auxiliary yoke 39, it receives the biasing force of the return spring 36. The washer 40, which is in contact with the upper surface of the auxiliary yoke 39 in this state, closes the gap between the drive shaft 23 and the through hole 38, thereby suppressing foreign matter from entering the movable plunger 22 side.

Furthermore, even if a minute foreign object enters the movable plunger 22 through a small gap between the outer periphery of the drive shaft 23 and the through hole 40a of the washer 40, the drive shaft 23 located below the through hole 38 of the auxiliary yoke 39 Minute foreign matter is collected in a foreign matter collection pocket 41 provided on the outer periphery. Therefore, minute foreign matter that has entered the movable plunger 22 does not enter the sliding portion between the plunger body 22a of the movable plunger 22 and the cap 35, etc.

Here, when the contact mechanism 4 shifts from the closed state to the open state, the drive shaft 23 may oscillate. When the drive shaft 23 oscillates, the washer 40 attached to the outer periphery of the drive shaft 23 slides on the outer periphery of the drive shaft 23 in the axial direction and moves the upper surface of the auxiliary yoke 39 in the direction of the axial runout of the drive shaft 23. slide along.

The through hole 40a of the washer 40 is set to have an outer diameter slightly larger than the outer diameter of the drive shaft 23, is loosely inserted on the outer periphery of the drive shaft 23, and is pressed against the upper surface of the auxiliary yoke 39 by the biasing force of the return spring 36. Therefore, when the drive shaft 23 runs out, the friction generated by sliding between the washer 40 and the outer circumference of the drive shaft 23 and the friction generated by sliding between the washer 40 and the upper surface of the auxiliary yoke 39 are reduced. is a small value.

In this way, in this embodiment, when a foreign object generated in the contact mechanism 4 disposed in the contact mechanism housing space R1 tries to move toward the movable plunger housing space R2, the foreign matter attached to the drive shaft 23 constituting the partition member is removed. Since the washer 40 closes the gap between the through hole 38 formed in the auxiliary yoke 39 and the drive shaft 23, it is possible to suppress foreign matter from entering the movable plunger housing space R2.

Furthermore, if a minute foreign object enters the movable plunger housing space R2 through a small gap between the outer periphery of the drive shaft 23 and the through hole 40a of the washer 40, it will be damaged by the drive shaft 23 located below the through hole 38 of the auxiliary yoke 39. Since minute foreign matter is collected in the provided foreign matter collection pocket 41, the opening/closing operation of the contact mechanism 4 and the driving operation of the electromagnet unit 5 can be stably performed.

Furthermore, even if the drive shaft 23 oscillates due to the opening and closing operations of the contact mechanism 4, it will be loosely inserted into the outer periphery of the drive shaft 23 and pressed against the upper surface of the auxiliary yoke 39 by the biasing force of the return spring 36. The washer slides with only small friction occurring between the outer periphery of the drive shaft 23 and the upper surface of the auxiliary yoke 39, and no metal powder is generated due to friction.

Therefore, the electromagnetic contactor 1 of the present embodiment can stably open and close the contact mechanism 4 even if the drive shaft 23 oscillates, and prevents foreign matter from entering the electromagnet unit 5 side. The driving operation of the electromagnet unit 5 can be performed stably.

In the present embodiment, the washer 40 having a flat annular shape is used as a foreign matter intrusion prevention member that closes the gap between the through hole 38 formed in the auxiliary yoke 39 and the drive shaft 23, but the washer 40 is limited to a flat annular shape. Alternatively, a washer 40 made of a material other than metal may be used.

Further, in this embodiment, the foreign matter collection pocket 41 is provided on the outer periphery of the drive shaft 23 and is positioned below the through hole 38 of the auxiliary yoke 39, but the gist of the present invention is not limited to this, and for example, A foreign matter collection pocket may be provided in the upper surface opening of the peripheral flange portion 22b of the movable plunger 22 at a position below the through hole 38 of the auxiliary yoke 39.

1 Electromagnetic contactor 2 Storage chamber 2A Contact mechanism storage space 2B Movable plunger storage space 4 Contact mechanism 5 Electromagnet unit 6 Contact storage case 7 Square cylinder 7a Square cylinder flange part 8 Insulating substrates 9, 10 Through holes 11, 12 Conductor part 13 First fixed contacts 13a, 14a First and second fixed contacts 13b, 14b First conductive plate parts 13c, 14c Second conductive plate parts 13d, 14d Third conductive plate part 14 Second fixed contact 15 Movable contact 15a, 15b First and second movable contacts 16, 17 Arc barrier 18 Insulating holder 18a Cylindrical insulating wall 18b Insulating bottom 18c Through hole 18d Insulating cylinder portions 19a, 19b Magnetic plate 21 Upper magnetic yoke (magnetic yoke)
21a Through hole 22 Movable plunger 22a Plunger body 22b Circumferential collar 22c Tapered surface 23 Drive shaft 24 Through hole 25 Drive shaft flange 26 Contact spring 27a Spring receiver 27b C ring 28 Lower magnetic yoke 29 Fixed plunger 30 Spool 31 Central cylindrical portion 32 Lower flange portion 33 Upper flange portion 34 Excitation coil 35 Cap 35a Flange portion 36 Return spring 37 Drive permanent magnet 38 Through hole 39 Auxiliary yoke 40 Washer 40a Through hole 41 Foreign matter collection pocket 42 Insulating holder fixing spring R Accommodation space R1 Contact mechanism Housing space R2 Movable plunger housing space

Claims (6)

a contact mechanism having a pair of fixed contacts having fixed contacts, a movable contact having a pair of movable contacts that can come into contact with and separate from the fixed contacts, and a drive shaft connected to the movable contacts;
an electromagnet unit having a movable plunger connected via the drive shaft in a direction in which the movable contact approaches and separates from the fixed contact;
an accommodation space that accommodates the contact mechanism and the movable plunger,
The accommodation space is partitioned by a partition member into a contact mechanism accommodation space that accommodates the contact mechanism and a movable plunger accommodation space that accommodates the movable plunger, and the drive shaft is inserted into a through hole formed in the partition member. connected to the movable contact and the movable plunger ;
A foreign matter intrusion prevention member that closes a gap between the outer periphery of the drive shaft and the through hole of the partition member is slidably disposed on the outer periphery of the drive shaft and the partition member when the drive shaft is in an axial deflection state. In addition to being
The electromagnetic contactor is characterized in that the foreign matter intrusion prevention member closes the gap while being pressed toward the partition member by a pressing member . The electromagnetic contactor according to claim 1 , wherein the pressing member is a coil spring disposed around the outer periphery of the drive shaft. The electromagnet unit is
a magnetic yoke surrounding an excitation coil wound around a spool;
The movable contact is connected to the drive shaft and includes a plunger body and a peripheral flange formed at one end of the plunger body, the plunger body is disposed within the spool so as to be movable in the axial direction, and the movable plunger having a flange disposed on the movable contact side;
a permanent magnet arranged so as to surround the peripheral flange;
an auxiliary yoke that is attracted to the permanent magnet and comes into contact with the peripheral flange portion, and is formed with the through hole through which the drive shaft is inserted;
a return spring disposed on the outer periphery of the drive shaft below the movable contact and biasing the auxiliary yoke in a direction toward the permanent magnet;
The partition member includes the magnetic yoke, the permanent magnet, the auxiliary yoke in which the through hole is formed through which the drive shaft is inserted, and a foreign matter intrusion prevention member disposed around the outer periphery of the drive shaft. ,
The electromagnetic contactor according to claim 1 , wherein the return spring functioning as the pressing member urges the foreign matter intrusion prevention member toward the auxiliary yoke. The electromagnetic contactor according to any one of claims 1 to 3, wherein the foreign matter intrusion prevention member is comprised of a washer. The electromagnetic contactor according to any one of claims 1 to 4 , wherein a foreign matter collection pocket is formed near the through hole of the partition member in the movable plunger housing space. 6. The electromagnetic contactor according to claim 5 , wherein the foreign matter collection pocket is a concave ring-shaped portion formed by reducing the diameter of a part of the outer periphery of the drive shaft.

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