JP2019096474A - Contact mechanism and electromagnetic contactor using the same - Google Patents

Abstract

To provide a contact mechanism that induces flow of metal vapor flowing in an arc extinguishing space and improves arc extinguishing performance.SOLUTION: A contact mechanism includes at least one pair of fixed contacts 13 and 14, a movable contact 15 disposed so as to be able to be brought into contact with or separated from at least the pair of fixed contacts, an insulating case that accommodates the fixed contact and the movable contact, and is constituted by a bottomed cylindrical insulating holder 18. The insulating case has at least one of ribs 63 to 65, 70, and 71 formed between an inner wall 61 formed in a longitudinal direction of the movable contact and an outer wall of an insulating case 18a.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a contact mechanism that opens and closes a current path and an electromagnetic contactor using the same.

As a contact mechanism applied to a magnetic contactor etc. which an arc generates at the time of current interruption, what is indicated, for example in patent documents 1 is known.
The contact mechanism in Patent Document 1 includes a pair of fixed contacts having a fixed contact, a movable contact having a pair of movable contacts capable of contacting and separating the fixed contacts of the pair of fixed contacts, and the pair of fixed contacts An insulating case formed of an insulating material that accommodates an armature and a movable contact, and an arc-extinguishing permanent placed around the insulating case and stretching an arc generated between a pair of fixed contacts and a pair of movable contacts A magnet, an arc extinguishing space provided in a direction in which the arc in the insulating case is stretched, a gas inflow space formed in a separate chamber from the arc extinguishing space in the insulating case, an arc extinguishing space, and the gas inflow space And a gas passage communicating with each other.

According to this contact mechanism, when an arc is generated between the pair of fixed contacts and the movable contact when the movable contact is released from the closing state where the movable contact is in contact between the pair of fixed contacts, the arc The action of the magnetic flux of the arc extinguishing permanent magnet extends the arc into the arc extinguishing space in the insulating case so as to extinguish the arc.
Here, a large amount of metal vapor is generated in the arc extinguishing space as the temperatures of the pair of fixed contacts and the movable contacts rise. In the contact mechanism of Patent Document 1, the metal vapor does not fill the arc extinguishing space by causing the metal vapor to flow dispersively in the arc extinguishing space and the gas inflow space communicating with the arc extinguishing space. Thus, the decrease in the insulation performance between the pair of fixed contacts and the movable contacts is suppressed to prevent re-arcing of the arc.

JP, 2016-24864, A

By the way, in the contact mechanism of Patent Document 1, metal vapor generated by the pair of fixed contacts and movable contacts flows linearly in the arc extinguishing space.
The arc generated between the pair of fixed contacts and movable contacts is induced by the flow of metal vapor and stretched, but in the contact mechanism of Patent Document 1, the metal vapor flows linearly in the arc extinguishing space. Therefore, the extension of the arc is also linear.

For this reason, in the contact mechanism of Patent Document 1, the arc extending linearly in the arc extinguishing space has a smaller area in contact with the wall surface forming the arc extinguishing space, and the effect of cooling the arc is reduced. There is room for improvement in terms of arcing performance.
Then, this invention aims at providing the contact mechanism which can guide the flow of the metal vapor which flows through arc extinguishing space, and can improve arc-extinguishing performance, and an electromagnetic contactor using the same.

In order to achieve the above object, a contact mechanism according to an aspect of the present invention comprises at least a pair of fixed contacts, a movable contact disposed so as to be able to contact and release with the pair of fixed contacts, a fixed contact and a movable And an insulating case formed of a bottomed cylindrical insulating holder for housing the contact, the insulating case being an inner wall formed along the longitudinal direction of the movable contact, an inner wall, and an outer wall of the insulating case And at least one rib formed between them.
An electromagnetic contactor according to one aspect of the present invention includes the above-described contact mechanism, and a contact case housing the contact mechanism and an electromagnet unit portion driving the contact mechanism are sealed.

  According to the contact mechanism according to the present invention and the magnetic contactor using the same, the flow of the metal vapor flowing in the arc extinguishing space is changed to a curved flow to form a wall surface forming the arc extinguishing space. The contact area of the arc can be increased to improve the arc extinguishing performance of the arc.

BRIEF DESCRIPTION OF THE DRAWINGS It is an external view which shows the electromagnetic contactor of 1st Embodiment which concerns on this invention. It is sectional drawing which shows the electromagnetic contactor of 1st Embodiment. It is sectional drawing which showed the contact mechanism of the magnetic contactor of 1st Embodiment by planar view. It is a perspective view which shows the insulation holder which comprises the insulation case of 1st Embodiment. It is sectional drawing which showed the inside of the contact storage case of the contact mechanism of 1st Embodiment by the side view. It is a perspective view which shows the insulation cover which comprises the insulation case of 1st Embodiment. It is a perspective view which shows the airtight member which comprises the contact mechanism of 1st Embodiment. It is a perspective view which shows the insulation holder which comprises the insulation case of 2nd Embodiment which concerns on this invention. It is sectional drawing which showed the inside of the contact storage case of the contact mechanism of 2nd Embodiment by the side view. It is sectional drawing which showed the contact mechanism of the magnetic contactor of 2nd Embodiment by planar view. It is a perspective view which shows the insulation holder which comprises the insulation case of 3rd Embodiment which concerns on this invention. It is sectional drawing which showed the inside of the contact storage case of the contact mechanism of 3rd Embodiment by the side view. It is sectional drawing which showed the contact mechanism of the electromagnetic contactor of 3rd Embodiment by planar view. It is sectional drawing which showed the inside of the contact storage case of the contact mechanism of 4th Embodiment which concerns on this invention by the side view. It is a perspective view which shows the insulation holder which comprises the insulation case of 4th Embodiment. It is a perspective view which shows the insulation cover which comprises the insulation case of 4th Embodiment. It is sectional drawing which showed the contact mechanism of the electromagnetic contactor of 4th Embodiment by planar view.

  Next, first to fourth embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between the thickness and the planar dimension, the ratio of the thickness of each layer, and the like are different from the actual ones. Therefore, specific thicknesses and dimensions should be determined in consideration of the following description. Moreover, it is a matter of course that parts having different dimensional relationships and ratios among the drawings are included.

  In addition, the first to fourth embodiments described below illustrate apparatuses and methods for embodying the technical idea of the present invention, and the technical idea of the present invention includes materials of components, The shape, structure, arrangement, etc. are not specified in the following. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.

First Embodiment
FIGS. 1 to 7 show a magnetic contactor 1 according to a first embodiment of the present invention.
As shown in FIG. 1, the electromagnetic contactor 1 includes a first housing 2 and a second housing 3.
As shown in FIG. 2, the contact mechanism 4 is disposed inside the first housing 2, and the electromagnet unit 5 for driving the contact mechanism 4 is disposed inside the second housing 3.
The contact mechanism 4 is housed in the contact housing case 6. The contact storage case 6 includes a rectangular cylindrical body 7 made of metal, and an insulating substrate 8 formed of an insulating material such as ceramic or a synthetic resin material for closing the upper end of the rectangular cylindrical body 7.

The rectangular cylindrical body 7 is fixed in a state in which a flange portion 7 a formed at a lower portion is seal-joined to an upper magnetic yoke 21 described later of the electromagnet unit 5. Through holes 9 and 10 are formed in the insulating substrate 8 at predetermined intervals.
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 the insulating substrate 8 via the conductor portions 11 and 12; The first and second fixed contacts 13a and 14a provided on the first and second fixed contacts 13 and 14 are provided with movable contacts 15 in which the first and second movable contacts 15a and 15b are opposed to each other There is.

The movable contact 15 is supported by a connecting shaft 23 fixed to the movable plunger 22 of the electromagnet unit 5, and a through hole 24 through which the connecting shaft 23 is inserted is formed at a central portion of the movable contact 15.
An outwardly projecting flange portion 25 is formed at the central portion in the longitudinal direction of the connecting shaft 23, and the connecting shaft 23 is inserted into the through hole 24 of the movable contact 15 from the upper end. The central lower portion abuts on the flange portion 25 and the contact spring 26 is inserted from the upper portion of the connecting shaft 23. Then, the upper end of the contact spring 26 is fixed by the spring receiver 27a fixed to the upper end of the connecting shaft 23 and the C ring 27b, whereby the contact spring 26 applies a predetermined biasing force to the movable contact 15. .

Inside the contact housing case 6, the bottomed rectangular cylindrical insulating holder 18, the insulating cover 50 closing the upper opening of the insulating holder 18, and the upper surface of the insulating cover 50 and the lower surface of the insulating substrate 8 are sandwiched. An insulating case is housed which is composed of a plate-like airtight member 51 made of an elastic member.
The electromagnet unit 5 has a flat U-shaped magnetic yoke 28 seen from the side, and a fixed plunger 29 is disposed at the center of the bottom plate of the magnetic yoke 28, and the spool 30 is outside the fixed plunger 29. It is arranged.

  The spool 30 has a central cylindrical portion 31 through which the fixed plunger 29 is inserted, a lower flange portion 32 projecting radially outward from the lower end portion of the central cylindrical portion 31, and a slightly lower side than the upper end of the central cylindrical portion 31. It is comprised with the upper flange part 33 which protrudes radially outward. The exciting coil 34 is wound around a storage space formed by the central cylindrical portion 31, the lower flange portion 32 and the upper flange portion 33.

In the upper magnetic yoke 21 fixed to the upper end which is the open end of the magnetic yoke 28, a through hole 21a opposed to the central cylindrical portion 31 of the spool 30 is formed at the central portion.
An upper portion of the fixed plunger 29 inserted into the central cylindrical portion 31 of the spool 30 is covered with a cap 35 formed in a bottomed cylindrical shape, and is formed to extend radially outward at the open end of the cap 35 The flange portion 35a is disposed. The flange portion 35 a is seal-joined to the lower surface of the upper magnetic yoke 21. As a result, a sealed container is formed in which the cap 35 is in communication with the through hole 21 a of the upper magnetic yoke 21.

Inside the cap 35, a movable plunger 22 having a return spring 36 disposed at the lowermost portion is slidably inserted in the vertical direction. The movable plunger 22 is provided at its upper end projecting upward from the upper magnetic yoke 21 with a circumferential flange 22a projecting radially outward.
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 circumferential flange 22 a of the movable plunger 22. The driving permanent magnet 37 is magnetized in the vertical direction, that is, in the thickness direction, for example, with the upper end side as an N pole and the lower end side as an S pole.

An auxiliary yoke 39 having a through hole 38 of the same outer diameter as the drive permanent magnet 37 and smaller than the outer diameter of the peripheral flange portion 22a of the movable plunger 22 is fixed to the upper end surface of the drive permanent magnet 37. The peripheral flange portion 22 a of the movable plunger 22 is in contact with the lower surface of the yoke 39.
In the sealed contact storage case 6, various gases for arc extinction are enclosed.

The movable contact 15 constituting the contact mechanism 4 is a conductive plate elongated in the left-right direction of FIG. 2 made of a conductive material, the connecting shaft 23 is connected to the central portion in the longitudinal direction, and the longitudinal direction is The 1st movable contact 15a and the 2nd movable contact 15b are formed in the lower surface of the both end side of this.
The first fixed contact 13 and the second fixed contact 14 constituting the contact mechanism 4 are conductive plates of C-shape in a side view made of a conductive material, and are provided on both end sides of the movable contact 15 in the longitudinal direction. They are separated and fixed to the insulating substrate 8 via the conductor portions 11 and 12.

  The first fixed contact 13 is disposed at one end in the longitudinal direction on the side of the first movable contact 15 a of the movable contact 15 and faces the first movable contact 15 a of the movable contact 15 from the lower side, The first conductive plate portion 13b provided with the first fixed contact 13a on the upper surface, and the second conductive plate portion bent upward from the end of the first conductive plate portion 13b separated from the movable contact 15 and extending upward 13 c and a third conductive plate portion 13 d bent from the upper end of the second conductive plate portion 13 c and extending above the movable contact 15.

  Further, the second fixed contact 14 is disposed at the other end in the longitudinal direction on the side of the second movable contact 15 b of the movable contact 15 and faces the second movable contact 15 b of the movable contact 15 from the lower side A second conductive member which is bent upward from the end of the first conductive plate portion 14b provided with the second fixed contact 14a on the upper surface and the end portion of the first conductive plate portion 14b separated from the movable contact 15 A plate portion c and a third conductive plate portion d which is bent from the upper end of the second conductive plate portion c and extends above the movable contact 15 are provided.

  A cover 16 made of synthetic resin is mounted on the first fixed contact 13 to limit the occurrence of arcs. The second fixed contact 14 is also provided with a cover 17 made of synthetic resin that regulates the occurrence of an arc. Thereby, the first fixed contact 13a and the first conductive plate portion 13b are exposed on the inner peripheral surface of the first fixed contact 13, and the second fixed contact 14a and the first fixed contact on the inner peripheral surface of the second fixed contact 14. The conductive plate portion 14b is exposed.

In addition, a C-shaped magnetic body seen from a plan view 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, 19b are mounted. 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 in a released state, in a state where the movable contacts 15a and 15b located on both ends in the longitudinal direction and the fixed contacts 13a and 14a of the fixed contacts 13 and 14 are separated with a predetermined interval maintained. Become.

Further, the movable contact 15 is set so that the movable contacts 15a and 15b contact the fixed contacts 13a and 14a of the fixed contacts 13 and 14 with a predetermined contact pressure by the contact spring 26 at the closing position. .
FIG. 3 shows the inside of the contact mechanism 4 in a plan view, and the first to fourth permanent magnets for arc extinguishing 40 to 43 are disposed on the outer periphery of the rectangular cylinder 7 of the contact storage case 6 There is.

A metal magnet support 60 is fixed to the inner peripheral surface of the first and second housings 2 and 3 surrounding the outer periphery of the rectangular cylinder 7 at positions surrounding the four sides of the rectangular cylinder 7. There is.
The first arc extinguishing permanent magnet 40 is fixed to the magnet support 60 so as to face one side surface 15 c in the width direction of the movable contact 15 via the rectangular cylinder 7 and the insulation holder 18. The second arc extinguishing permanent magnet 41 is fixed to the magnet support 60 so as to face the other side surface 15 d in the width direction of the movable contact 15 via the rectangular cylinder 7 and the insulating holder 18.

The first and second arc extinguishing permanent magnets 40 and 41 are magnetized such that the magnetic pole surfaces in contact with the rectangular cylinder 7 have N poles.
Further, the third arc extinguishing permanent magnet 42 is fixed to the magnet support 60 so as to face one side surface 15 e in the longitudinal direction of the movable contact 15 via the rectangular cylinder 7 and the insulating holder 18. . The fourth arc extinguishing permanent magnet 43 is fixed to the magnet support 60 so as to face the other side surface 15 f in the longitudinal direction of the movable contact 15 via the rectangular cylinder 7 and the insulating holder 18.

The third and fourth arc extinguishing permanent magnets 42 and 43 are magnetized such that the magnetic pole surfaces in contact with the rectangular cylinder 7 become S poles.
Here, FIG. 4 is a view showing an insulating holder 18 which is formed in a bottomed rectangular cylindrical shape and is disposed in the inside of the contact storage case 6. The insulating holder 18 is formed of an insulating synthetic resin that generates hydrogen gas when it is melted.

  A first inner wall 61 is formed between the first fixed contact 13 a and the second fixed contact 14 a along the side surface 15 c in the longitudinal direction of the movable contact 15 at the bottom of the insulating holder 18. A second inner wall 62 is also formed on the bottom of the insulating holder 18 along the other side surface 15 d in the longitudinal direction of the movable contact 15 between the first fixed contact 13 a and the second fixed contact 14 a. .

A first arc extinguishing space 45 is formed between the first inner wall 61 of the insulating holder 18 and the first outer wall 18a opposed thereto. A second arc extinguishing space 46 is formed between the second inner wall 62 of the insulating holder 18 and the second outer wall 18 b opposed thereto.
Further, at the bottom of the insulating holder 18 forming the first arc extinguishing space 45, the height rises lower than the first inner wall 61 at right angles to the first inner wall 61, and they are mutually separated in parallel. First to third holder side orthogonal ribs 63 to 65 are formed. The bottom of the insulating holder 18 forming the second arc extinguishing space 46 also rises in a state where the height is lower than the second inner wall 62 at right angles to the second inner wall 62 and is separated from each other in parallel. The fourth to sixth holder side orthogonal ribs 66 to 68 are formed.

The insulating cover 50 disposed inside the contact housing case 6 and closing the upper opening of the insulating holder 18 is a plate member formed of an insulating synthetic resin that generates hydrogen gas when it is melted.
As shown in FIG. 6, the insulating cover 50 is formed with through holes 50a and 50b through which the conductor portions 11 and 12 pass, and the first to fourth cover side orthogonal ribs 70 to 73 project from the lower surface. It is formed.

Further, as shown in FIG. 5, the insulating cover 50 constituting the insulating case closes the upper opening of the insulating holder 18.
As shown in FIGS. 3 and 5, the first cover-side orthogonal rib 70 extends in parallel between the first holder-side orthogonal rib 63 and the second holder-side orthogonal rib 64, and the second cover-side orthogonal rib 71. Extends in parallel between the second holder side orthogonal rib 64 and the third holder side orthogonal rib 65. And in FIG. 5, the lower end of the 1st cover side orthogonal rib 70 and the 2nd cover side orthogonal rib 71 protrudes to the substantially same height as the upper end of the 1st-3rd holder side orthogonal ribs 63-65.

  In addition, as shown in FIG. 3, the third cover-side orthogonal rib 72 extends in parallel between the fourth holder-side orthogonal rib 66 and the fifth holder-side orthogonal rib 67, and the fourth cover-side orthogonal rib 73 is , And extends in parallel between the fifth holder side orthogonal rib 67 and the sixth holder side orthogonal rib 68. The tips of the third cover-side orthogonal rib 72 and the fourth cover-side orthogonal rib 73 also protrude to substantially the same height as the tips of the fourth to sixth holder-side orthogonal ribs 66 to 68.

  Further, as shown in FIG. 7, the airtight member 51 disposed between the upper surface of the insulating cover 50 and the lower surface of the insulating substrate 8 has through holes 51 a and 51 b through which the conductor portions 11 and 12 pass. The airtight member 51 is in a compressed state by being disposed between the upper surface of the insulating cover 50 and the lower surface of the insulating substrate 8 as shown in FIG. Since the airtight member 51 in the compressed state closes the gap formed between the opening of the insulating holder 18 and the insulating substrate 8, the sealing degree of the inside of the insulating holder 18 is enhanced.

Here, the inner wall described in the present invention corresponds to the first inner wall, the outer wall described in the present invention corresponds to the first outer wall, and the movable iron core described in the present invention corresponds to the movable plunger 22. The operation electromagnet described in the present invention corresponds to the electromagnet unit 5.
Next, the operation of the magnetic contactor 1 of the first embodiment will be described.
In the magnetic contactor 1 of the first embodiment, a positive (+) terminal is connected to the first fixed contact 13 and a negative (-) terminal is connected to the second fixed contact 14.

Now, it is assumed that the exciting coil 34 of the electromagnet unit 5 is in the non-excitation state, and the electromagnet unit 5 is in the released state where the exciting force for lowering the movable plunger 22 is not generated.
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, the attraction force by the magnetic force of the driving permanent magnet 37 acts on the auxiliary yoke 39, and the circumferential ridge 22a of the movable plunger 22 is attracted. Therefore, the upper surface of the peripheral flange portion 22 a of the movable plunger 22 is in contact with the lower surface of the auxiliary yoke 39.

  Therefore, 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 connection shaft 23 are the first fixed contacts of the first fixed contact 13. 13a, the second fixed contact 14a of the second fixed contact 14 is separated upward by a predetermined distance. Therefore, the current path between the first fixed contact 13 and the second fixed contact 14 is in the disconnected state, and the contact mechanism 4 is in the open state.

When the excitation coil 34 of the electromagnet unit 5 is energized in this released state, an excitation force is generated in the electromagnet unit 5 and the movable plunger 22 resists the biasing force of the return spring 36 and the attraction force of the driving permanent magnet 37. Push down. The descent of the movable plunger 22 is stopped when the lower surface of the peripheral flange portion 22 a hits the upper surface of the upper magnetic yoke 21.
Thus, when the movable plunger 22 descends, the movable contact 15 connected to the movable plunger 22 via the connecting shaft 23 also descends, and the first movable contact 15 a of the movable contact 15 of the contact mechanism 4 The second movable contact 15 b contacts the first fixed contact 13 a of the first fixed contact 13 and the second fixed contact 14 a of the second fixed contact 14 by the contact pressure of the contact spring 26.

Therefore, a large current of the power supply source is in a closed state in which the load device is supplied through the first fixed contact 13, the movable contact 15, and the second fixed contact 14.
When the current supply to the load device is cut off from the closed state of the contact mechanism 4, the excitation of the exciting coil 34 of the electromagnet unit 5 is stopped.
When the excitation to the exciting coil 34 is stopped, the exciting 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 circumferential rib 22a is the auxiliary yoke As it approaches 39, the attractive force of the drive permanent magnet 37 increases.

  As the movable plunger 22 ascends, the movable contact 15 connected via the connecting shaft 23 ascends. Accordingly, when the contact spring 26 applies a contact pressure, the first movable contact 15 a and the second movable contact 15 b of the movable contact 15 are the first fixed contact 13 a of the first fixed contact 13 and the second fixed contact. It is in contact with the second fixed contact 14 a of the contact 14. Thereafter, when the contact pressure of the contact spring 26 disappears, the movable contact 15 is in an open state where the first fixed contact 13 and the second fixed contact 14 are separated upward.

  In such an opening start state, as shown in FIG. 3, a first arc (not shown) is formed between the first movable contact 15a of the movable contact 15 and the first fixed contact 13a of the first fixed contact 13. Is generated, and a second arc (not shown) is generated between the second movable contact 15b of the movable contact 15 and the first fixed contact 14a of the second fixed contact 14. The state is continued. At this time, the current direction of the first arc is a direction from the first fixed contact 13a to the first movable contact 15a, and the current direction of the second arc is a direction from the second movable contact 15b to the second fixed contact 14a. It is.

Here, the magnetic flux flowing out of the N pole of the first arc extinguishing permanent magnet 40 and flowing to the S pole of the third arc extinguishing permanent magnet 42 and the N pole of the second arc extinguishing permanent magnet 41 A magnetic flux flowing to the S pole of the third arc extinguishing permanent magnet 42 passes near the first arc and is generated outward of one longitudinal side surface 15 e of the movable contact 15.
In addition, the magnetic flux that flows out of the N pole of the first arc extinguishing permanent magnet 40 and flows to the S pole of the fourth arc extinguishing permanent magnet 43 and the N pole of the second arc extinguishing permanent magnet 41 A magnetic flux flowing to the S pole of the 4-arc arc extinguishing permanent magnet 43 passes near the second arc and is generated outward of the other longitudinal side face 15 f of the movable contact 15.

  Between the first fixed contact 13 a of the first fixed contact 13 and the first movable contact 15 a of the movable contact 15, the first arc extends from the first fixed contact 13 a side to the first movable contact 15 a side, and the first arc The magnetic flux generated by the 1 arc extinguishing permanent magnet 40, the second arc extinguishing permanent magnet 41 and the 3 rd arc extinguishing permanent magnet 42 is directed outward of one side face 15e of the movable contact 15 in the longitudinal direction. Occurs. Thereby, a large Lorentz force F1 is generated on the side facing the first outer wall 18a on the side face 15c on one side in the width direction of the movable contact 15 according to Fleming's left law from the relationship between the current flow and the magnetic flux of the first arc. (See Figure 3).

The first arc generated between the first fixed contact 13a and the first movable contact 15a is stretched toward the first outer wall 18a by the Lorentz force F1.
In addition, between the second fixed contact 14a of the second fixed contact 14 and the second movable contact 15b of the movable contact 15, the second arc extends from the second movable contact 15b to the second fixed contact 14a. The magnetic flux generated by the first arc extinguishing permanent magnet 40, the second arc extinguishing permanent magnet 41, and the fourth arc extinguishing permanent magnet 43 is the outer side of the other side face 15f of the movable contact 15 in the longitudinal direction. It occurs toward the Thereby, from the relationship between the current flow and the magnetic flux of the second arc, the large Lorentz force F2 toward the first arc extinction space 45 on the side face 15c on one side in the width direction of the movable contact 15 according to Fleming's left law. Occurs.

The second arc generated between the second fixed contact 14a and the second movable contact 15b is stretched toward the first outer wall 18a by the Lorentz force F2.
Here, the first fixed contact 13a, the second fixed contact 14a of the first and second fixed contacts 13, 14 and the first movable contact 15a, the second of the movable contact 15 due to the generation of the first arc and the second arc. When the temperature rises due to the arc of the movable contact 15b, the first fixed contact 13a, the second fixed contact 14a, the first movable contact 15a and the second movable contact 15b melt and a large amount of metal vapor is generated.

The metal vapor generated in the vicinity of the first arc collides with the first outer wall 18a of the insulating holder 18 and then flows toward the second fixed contact 14 of the first arc extinction space 45 (as shown in FIG. 3) It becomes the flow J1 of the first metal vapor.
Here, the first arc drawn to the vicinity of the first outer wall 18a by the Lorentz force F1 is induced by the flow J1 of the first metal vapor and drawn toward the first arc extinction space 45.

Further, metal vapor generated near the second arc collides with the first outer wall 18a of the insulating holder 18 and then travels to the first fixed contact 13 of the first arc extinction space 45, as shown in FIG. It becomes a flow (the second metal vapor flow J2).
Then, the second arc drawn to the vicinity of the first outer wall 18 a by the Lorentz force F 2 is induced by the second metal vapor flow J 2 and drawn toward the first arc extinction space 45.

  As shown in FIG. 5, the flow J1 of the first metal vapor is the first holder side orthogonal rib 63, the first cover side orthogonal rib 70, and the second holder side orthogonal disposed in the first arc extinction space 45. The metal vapor collides in the order of the rib 64 and the second cover side orthogonal rib 71. As a result, the flow direction of the first metal vapor flow J1 changes to a serpentine state, and the metal vapor is diffused to the entire area of the first arc extinguishing space 45.

  Then, the first arc stretched toward the first outer wall 18 a together with the first metal vapor flow J 1 is induced to the first metal vapor flow J 1 and spreads over the entire first arc extinction space 45. Contact area with the inner wall of the first arc extinguishing space 45 (the first holder side orthogonal rib 63, the first cover side orthogonal rib 70, the second holder side orthogonal rib 64, the second cover side orthogonal rib 71, etc.) Will increase.

  In addition, as shown in FIG. 5, the second metal vapor flow J2 also includes the third holder side orthogonal rib 65, the second cover side orthogonal rib 71, and the second holder disposed in the first arc extinction space 45. The metal vapor collides in the order of the side orthogonal rib 64 and the first cover side orthogonal rib 70. As a result, the direction of the flow direction of the second metal vapor flow J 2 changes to a serpentine state, and the metal vapor is diffused to the entire area of the first arc extinction space 45.

  Then, the second arc stretched toward the first outer wall 18 a together with the second metal vapor flow J 2 is induced to the second metal vapor flow J 2 and spreads over the entire first arc extinction space 45. Contact area with the inner wall of the first arc extinguishing space 45 (third holder side orthogonal rib 65, second cover side orthogonal rib 71, second holder side orthogonal rib 64, first cover side orthogonal rib 70, etc.) Will increase.

  Thus, the first arc generated between the first fixed contact 13a and the first movable contact 15a, and the second arc generated between the second fixed contact 14a and the second movable contact 15b are the first metal vapors. Flow J1 and the flow J2 of the second metal vapor induce the inner wall of the first arc extinguishing space 45 (first to third holder side orthogonal ribs 63 to 65 rising from the bottom of the insulating holder 18 and the insulating cover 50 The area of contact with the first and second cover-side orthogonal ribs 70, 71) protruding toward the bottom of the insulating holder 18 is increased.

Since these inner walls generate cooling gas in contact with the arcs, the cooling effect of the first and second arcs is enhanced, and the arcing of the first and second arcs is reliably performed to achieve the arcing performance. It can be improved.
Further, the airtight member 51 in a compressed state is disposed between the upper surface of the insulating cover 50 disposed inside the contact housing case 6 and the lower surface of the insulating substrate 8, so the degree of sealing of the inside of the insulating holder 18 is increased. Therefore, it is possible to reliably prevent the metal vapor generated in the first and second arc extinguishing spaces 45 and 46 from leaking to the outside of the insulating holder 18, and to provide the highly reliable electromagnetic contactor 1.

  In addition, first to third holder side orthogonal ribs 63 to 65 rising from the bottom of the insulating holder 18 in the first arc arc-extinguishing space 45, and the first and second projecting from the insulating cover 50 toward the bottom of the insulating holder 18 The cover side orthogonal ribs 70 and 71 are alternately arranged, and the metal vapor is caused to collide with these ribs, and the flow of the first metal vapor J1 and the flow of the second metal vapor of the first arc extinction space 45 Since J2 can be changed to serpentine flow, metal vapor can be diffused to the entire area of the first arc extinguishing space 45 with a simple configuration.

In addition, although the insulating cover 50 of 1st Embodiment was formed with the insulating synthetic resin which hydrogen gas generate | occur | produces when it fuses, when using the insulating cover 50 made of ceramic, the 1st, 2nd cover side of ceramic Since the orthogonal ribs 70 and 71 can promote arc extinction by contacting the arcs, arc extinction performance can be improved.
Here, when the negative (-) terminal is connected to the first fixed contact 13 of the magnetic contactor 1 of the first embodiment and the positive (+) terminal is connected to the second fixed contact 14, in the opening start state The first arc between the first fixed contact 13a and the first movable contact 15a, and the second arc between the second fixed contact 14a and the second movable contact 15b are stretched toward the second outer wall 18b.

  Then, the metal vapor generated in the second arc extinguishing space 46 collides with the second outer wall 18 b of the insulating holder 18 and then flows toward the second fixed contact 14 in the second arc extinguishing space 46. The holder side orthogonal rib 66, the third cover side orthogonal rib 72, the fifth holder side orthogonal rib 67, and the fourth cover side orthogonal rib 73 collide with each other in order, and the flow is diffused to the entire area of the second arc extinguishing space 46 Become.

Thereby, the first arc drawn to the vicinity of the second outer wall 18 b is induced by the flow of the metal vapor diffused in the entire area of the second arc extinction space 46, and the contact area with the inner wall of the second arc extinction space 46 Increases. Further, the second arc drawn to the vicinity of the second outer wall 18b is also induced by the flow of the metal vapor diffused in the entire area of the second arc extinction space 46, and the contact area with the inner wall of the second arc extinction space 46 is Increase.
Therefore, the first arc and the second arc generated toward the second outer wall 18b also increase the cooling effect by increasing the contact area with the inner wall of the second arc extinction space 46, and the arc extinction performance of the arc It can be improved.

Second Embodiment
FIGS. 8-10 shows the principal part of the electromagnetic contactor 1 of 2nd Embodiment which concerns on this invention. The same components as those shown in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.
The insulating holder 18 according to the second embodiment shown in FIG. 8 is disposed perpendicular to the first inner wall 61 at the bottom of the insulating holder 18 forming the first arc extinguishing space 45, and is disposed parallel to each other. The first to third holder side orthogonal ribs 75 to 77 are formed. These first to third holder side orthogonal ribs 75 to 77 are formed higher than the first to third holder side orthogonal ribs 63 to 65 in the first embodiment, and the first arc extinguishing space 45 is divided into a plurality in the longitudinal direction. It is formed to be.

  At the bottom of the insulating holder 18 forming the second arc extinguishing space 46, the fourth to sixth holder-side orthogonal ribs 78, which rise perpendicularly to the second inner wall 62 and are spaced apart in parallel to each other 80 are formed. The fourth to sixth holder side orthogonal ribs 78 to 80 are also formed higher than the fourth to sixth holder side orthogonal ribs 66 to 68 of the first embodiment, and the second arc extinguishing space 46 is divided into a plurality in the longitudinal direction. It is formed to be.

As shown in FIG. 9, in the second embodiment, the insulating cover 50 and the airtight member 51 used in the first embodiment of FIG. 5 are not disposed.
In the electromagnetic contactor 1 of the second embodiment, the positive (+) terminal is connected to the first fixed contact 13, and the negative (-) terminal is connected to the second fixed contact 14, and the opening starts In the state, as shown in FIG. 10, a first arc (not shown) is generated between the first movable contact 15a of the movable contact 15 and the first fixed contact 13a of the first fixed contact 13, so that the movable A second arc (not shown) is generated between the second movable contact 15 b of the contact 15 and the first fixed contact 14 a of the second fixed contact 14, and the current conduction is continued by these arcs.

Between the first fixed contact 13a of the first fixed contact 13 and the first movable contact 15a of the movable contact 15, a first arc extending from the first fixed contact 13a to the first movable contact 15a is Lorentz It is stretched toward the first outer wall 18a by the force F1.
In addition, between the second fixed contact 14a of the second fixed contact 14 and the second movable contact 15b of the movable contact 15, a second arc extending from the second movable contact 15b to the second fixed contact 14a is , And is stretched toward the first outer wall 18a by the Lorentz force F2.

The first fixed contact 13a, the second fixed contact 14a, the first movable contact 15a and the second movable contact 15b are melted to generate a large amount of metal vapor.
The metal vapor generated in the vicinity of the first arc collides with the first outer wall 18 a of the insulating holder 18 and then to the second fixed contact 14 of the first arc extinction space 45 as shown in FIGS. 9 and 10. It becomes a flow (the third metal vapor flow J3).

The first arc drawn to the vicinity of the first outer wall 18 a by the Lorentz force F 1 is induced by the third metal vapor flow J 3 and drawn toward the first arc extinguishing space 45.
Further, as shown in FIGS. 9 and 10, the metal vapor generated in the vicinity of the second arc collides with the first outer wall 18a of the insulating holder 18, and then the first fixed contact of the first arc extinction space 45 It becomes the flow (flow J4 of the 4th metal vapor) which goes to 13.

The second arc drawn to the vicinity of the first outer wall 18 a by the Lorentz force F 2 is induced by the fourth metal vapor flow J 4 and drawn toward the first arc extinguishing space 45.
In the third metal vapor flow J3, as shown in FIG. 9, the metal vapor collides in the order of the first holder side orthogonal rib 75 and the second holder side orthogonal rib 76 disposed in the first arc arcing space 45. Do. As a result, the flow direction of the third metal vapor flow J 3 changes to a serpentine state, and the metal vapor is diffused to the entire area of the first arc extinguishing space 45.

Then, the first arc stretched toward the first outer wall 18 a together with the third metal vapor flow J 3 is induced to the third metal vapor flow J 3 and spreads over the entire first arc extinction space 45. The contact area with the inner wall (the first holder side orthogonal rib 75, the second holder side orthogonal rib 76, and the third holder side orthogonal rib 77) of the first arc extinguishing space 45 increases.
In addition, as shown in FIG. 9, the fourth metal vapor flow J4 also includes the metal vapor in the order of the third holder side orthogonal rib 77 and the second holder side orthogonal rib 76 disposed in the first arc extinguishing space 45. As a result of the collision, the direction of the flow direction changes to a serpentine state, resulting in a flow in which the metal vapor diffuses over the entire first arc extinguishing space 45.

Then, the second arc stretched toward the first outer wall 18 a together with the fourth metal vapor flow J 4 is induced to the fourth metal vapor flow J 4 and spreads over the entire first arc extinction space 45. The contact area with the inner wall (the third holder side orthogonal rib 77, the second holder side orthogonal rib 76, and the first holder side orthogonal rib 75) of the first arc extinguishing space 45 increases.
Thus, the first arc generated between the first fixed contact 13a and the first movable contact 15a, and the second arc generated between the second fixed contact 14a and the second movable contact 15b are the third metal vapors. Of the first arc and the second arc, because the contact area with the inner wall of the first arc extinguishing space 45 is increased and the cooling effect is increased. Can be reliably performed to improve the arc extinguishing performance.

  In addition, first to third holder side orthogonal ribs 75 to 77 rising from the bottom of the insulating holder 18 in the first arc extinguishing space 45 are disposed, and only by causing metal vapor to collide with these ribs, the first arc extinguishing Since the flow J3 of the third metal vapor and the flow J4 of the fourth metal vapor in the space 45 can be changed to a serpentine flow, the first arc extinction of the metal vapor is made with a simpler configuration than the first embodiment. It can be spread over the arc space 45.

  When the negative (-) terminal is connected to the first fixed contact 13 of the magnetic contactor 1 of the second embodiment and the positive (+) terminal is connected to the second fixed contact 14, the first contact is opened in the open state. A first arc between the first fixed contact 13a and the first movable contact 15a and a second arc between the second fixed contact 14a and the second movable contact 15b are generated toward the second outer wall 18b. Also in this case, as in the first embodiment, the first arc and the second arc generated toward the second outer wall 18b are the flow J4 of the meandering fourth metal vapor and the flow J5 of the fifth metal vapor. As the area of contact with the inner wall of the second arc extinguishing space 46 is increased, the cooling effect is increased, and the arc extinguishing performance of the arc can be improved.

Third Embodiment
Next, FIGS. 11 to 13 show the main parts of a magnetic contactor 1 according to a third embodiment of the present invention.
The insulation holder 18 of the third embodiment shown in FIG. 11 extends parallel to the bottom of the insulation holder 18 forming the first arc extinction space 45 along the first inner wall 61 and the first outer wall 18a. A first holder side parallel rib 81 which rises up to substantially the same height as the first inner wall 61 is formed.

Further, the bottom of the insulating holder 18 forming the second arc extinction space 46 also extends in parallel along the second inner wall 62 and the second outer wall 18 b and stands up to substantially the same height as the second inner wall 62. A second holder side parallel rib 82 is formed.
Further, as shown in FIG. 12, in the third embodiment as well as the second embodiment, the insulating cover 50 and the airtight member 51 used in the first embodiment of FIG. 5 are not disposed.

  In the magnetic contactor 1 of the third embodiment, the positive (+) terminal is connected to the first fixed contact 13 and the negative (-) terminal is connected to the second fixed contact 14, and the opening starts In the state, as shown in FIG. 13, a first arc (not shown) is generated between the first movable contact 15a of the movable contact 15 and the first fixed contact 13a of the first fixed contact 13, and the movable A second arc (not shown) is generated between the second movable contact 15 b of the contact 15 and the first fixed contact 14 a of the second fixed contact 14, and the current conduction is continued by these arcs.

Between the first fixed contact 13a of the first fixed contact 13 and the first movable contact 15a of the movable contact 15, a first arc extending from the first fixed contact 13a to the first movable contact 15a is Lorentz It is stretched toward the first outer wall 18a by the force F1.
In addition, between the second fixed contact 14a of the second fixed contact 14 and the second movable contact 15b of the movable contact 15, a second arc extending from the second movable contact 15b to the second fixed contact 14a is , And is stretched toward the first outer wall 18a by the Lorentz force F2.

The first fixed contact 13a, the second fixed contact 14a, the first movable contact 15a and the second movable contact 15b are melted to generate a large amount of metal vapor.
The metal vapor generated in the vicinity of the first arc collides with the first outer wall 18 a of the insulating holder 18 and then to the second fixed contact 14 of the first arc extinction space 45 as shown in FIGS. 12 and 13. It becomes a flow (flow J5 of the fifth metal vapor).

Then, the first arc drawn to the vicinity of the first outer wall 18 a by the Lorentz force F 1 is guided by the fifth metal vapor flow J 5 and drawn toward the first arc extinguishing space 45.
On the other hand, the metal vapor generated in the vicinity of the second arc collides with the first outer wall 18a of the insulating holder 18, as shown in FIGS. 12 and 13, and then the first fixed contactor of the first arc extinction space 45 It becomes the flow (the flow J6 of the sixth metal vapor) toward 13.

Then, the second arc drawn to the vicinity of the first outer wall 18 a by the Lorentz force F 2 is induced by the sixth metal vapor flow J 6 and drawn toward the first arc extinction space 45.
After the fifth metal vapor flow J5 collides with one end face of the first holder side parallel rib 81 disposed in the first arc extinguishing space 45 as shown in FIG. It becomes a flow branched into a first branch flow J5a flowing along and a second branch flow J5b flowing along the first outer wall 18a.

The first arc stretched toward the first outer wall 18a is guided to the fifth metal vapor flow J5 (first and second branched flows J5a, J5b), and the first inner wall 61 and the first outer wall 18a The contact area of the
Further, the flow J6 of the sixth metal vapor also collides with the other end face of the first holder side parallel rib 81 of the first arc extinguishing space 45 along the first inner wall 61, as shown in FIG. It becomes a flow branched into the flowing first branch flow J6a and the second branch flow J6b flowing along the first outer wall 18b.

Then, the second arc stretched toward the first outer wall 18a is guided to the flow J6 of the sixth metal vapor (first and second branched flows J6a, J6b), and the first inner wall 61 and the first outer wall The contact area of 18a increases.
Thus, the first arc generated between the first fixed contact 13a and the first movable contact 15a, and the second arc generated between the second fixed contact 14a and the second movable contact 15b are the fifth metal vapors. Flow J5 (first and second branch flows J5a, J5b) and sixth metal vapor flow J6 (first and second branch flows J6a, J6b) to form a first arc arc-extinguishing space 45 Since the contact area between the first inner wall 61 and the first outer wall 18b, and the first holder side parallel rib 81 is increased and the cooling effect is increased, the arcing of the first arc and the second arc is reliably performed. Thus, the arc extinguishing performance can be improved.

  Further, the first holder side parallel ribs 81 rising from the bottom portion of the insulating holder 18 in the first arc arcing space 45 are disposed, and the metal vapor of the first arc arcing space 45 is generated simply by colliding metal ribs with these ribs. Can be changed to the first and second branch flows J5a, J5b and the first and second branch flows J6a, J6b, so that the metal arc can be made into the first arc arcing space 45 with a simple configuration. Can spread throughout the

  When the negative (-) terminal is connected to the first fixed contact 13 of the magnetic contactor 1 of the third embodiment and the positive (+) terminal is connected to the second fixed contact 14, the first contact is opened in the open state. A first arc between the first fixed contact 13a and the first movable contact 15a and a second arc between the second fixed contact 14a and the second movable contact 15b are generated toward the second outer wall 18b. Also in this case, the first arc and the second arc generated toward the second outer wall 18 b are flowed of metal vapor by the second holder side parallel rib 82 provided in the second arc extinction space 46, the second inner wall 62 The branched flow of the side and second outer walls 18b induces the flow of the metal vapor. For this reason, the first arc and the second arc can increase the cooling effect by increasing the contact area with the inner wall of the second arc extinction space 46, and can improve the arc extinction performance of the arc.

Fourth Embodiment
Next, FIGS. 14 to 17 show the main parts of a magnetic contactor 1 according to a fourth embodiment of the present invention.
FIG. 14 shows the inside of the contact storage case 6 of the magnetic contactor 1 of the fourth embodiment, and is a bottomed rectangular cylindrical insulating holder 18 and an insulating cover 50 for closing the upper opening of the insulating holder 18. And an elastic plate-like airtight member 51 interposed between the upper surface of the insulating cover 50 and the lower surface of the insulating substrate 8.

As shown in FIG. 15, the insulating holder 18 of the fourth embodiment has a bottom portion of the insulating holder 18 forming the first arc extinction space 45 as in the first to third embodiments, or a second arc extinction. At the bottom forming the arc space 46, a member such as a shielding plate does not stand up.
On the other hand, in the insulating cover 50 according to the fourth embodiment, as shown in FIG. 16, first and second cover side parallel ribs 85 and 86 are formed to project from the lower surface.

  Then, when the insulating cover 50 is disposed in the upper opening of the insulating holder 18, as shown in FIG. 17, the first cover side parallel rib 85 is disposed in parallel along the first inner wall 61 and the first outer wall 18a. The second cover side parallel rib 86 is disposed in parallel along the second inner wall 61 and the second outer wall 18 b and extends to the bottom of the second arc extinction space 46. ing.

  In the electromagnetic contactor 1 of the fourth embodiment, the positive (+) terminal is connected to the first fixed contact 13, and the negative (-) terminal is connected to the second fixed contact 14, and the opening starts In the state, as shown in FIG. 17, a first arc (not shown) is generated between the first movable contact 15a of the movable contact 15 and the first fixed contact 13a of the first fixed contact 13, and the movable A second arc (not shown) is generated between the second movable contact 15 b of the contact 15 and the first fixed contact 14 a of the second fixed contact 14, and the current conduction is continued by these arcs.

Between the first fixed contact 13a of the first fixed contact 13 and the first movable contact 15a of the movable contact 15, a first arc extending from the first fixed contact 13a to the first movable contact 15a is Lorentz It is stretched toward the first outer wall 18a by the force F1.
In addition, between the second fixed contact 14a of the second fixed contact 14 and the second movable contact 15b of the movable contact 15, a second arc extending from the second movable contact 15b to the second fixed contact 14a is , And is stretched toward the first outer wall 18a by the Lorentz force F2.

The first fixed contact 13a, the second fixed contact 14a, the first movable contact 15a and the second movable contact 15b are melted to generate a large amount of metal vapor.
The metal vapor generated in the vicinity of the first arc collides with the first outer wall 18a of the insulating holder 18 and then flows toward the second fixed contact 14 of the first arc extinction space 45 (as shown in FIG. 17) It becomes the flow J5 of the fifth metal vapor.

The first arc stretched to the vicinity of the first outer wall 18 a by the Lorentz force F 1 is guided by the fifth metal vapor flow J 5 and stretched toward the first arc extinguishing space 45.
Further, metal vapor generated in the vicinity of the second arc collides with the first outer wall 18a of the insulating holder 18 and then travels to the first fixed contact 13 of the first arc extinction space 45, as shown in FIG. It becomes a flow (the flow J6 of the sixth metal vapor).

The second arc drawn to the vicinity of the first outer wall 18 a by the Lorentz force F 2 is induced by the sixth metal vapor flow J 6 and drawn toward the first arc extinguishing space 45.
After the fifth metal vapor flow J5 collides with one end face of the first cover side parallel rib 85 disposed in the first arc extinction space 45 as shown in FIG. It becomes a flow branched into a first branch flow J5a flowing along and a second branch flow J5b flowing along the first outer wall 18a.

The first arc drawn toward the first arc extinguishing space 45 is guided to the fifth metal vapor flow J5 (first and second branched flows J5a, J5b), and the first inner wall 61 and the first inner wall 61 and the first The contact area with the outer wall 18a increases.
Further, the flow J6 of the sixth metal vapor also collides with the other end face of the first holder side parallel rib 81 of the first arc extinguishing space 45 along the first inner wall 61 as shown in FIG. It becomes a flow branched into the flowing first branch flow J6a and the second branch flow J6a flowing along the first outer wall 18b.

The second arc drawn toward the first arc extinguishing space 45 is guided by the sixth metal vapor flow J6 (first and second branched flows J6a, J6b), and the first inner wall 61 The contact area of the first outer wall 18a increases.
Thus, the first arc generated between the first fixed contact 13a and the first movable contact 15a, and the second arc generated between the second fixed contact 14a and the second movable contact 15b are the fifth metal vapors. Flow J5 (first and second branch flows J5a, J5b) and sixth metal vapor flow J6 (first and second branch flows J6a, J6b) to form a first arc arc-extinguishing space 45 Since the contact area between the first inner wall 61 and the first outer wall 18b and the first cover side parallel rib 85 is increased and the cooling effect is increased, the arcing of the first arc and the second arc is reliably performed. Thus, the arc extinguishing performance can be improved.

  Further, the airtight member 51 in a compressed state is disposed between the upper surface of the insulating cover 50 disposed inside the contact housing case 6 and the lower surface of the insulating substrate 8, so the degree of sealing of the inside of the insulating holder 18 is increased. Therefore, it is possible to reliably prevent the metal vapor generated in the first and second arc extinguishing spaces 45 and 46 from leaking to the outside of the insulating holder 18, and to provide the highly reliable electromagnetic contactor 1.

Further, in the first arc arc-extinguishing space 45, the first cover side parallel rib 85 protrudes from the lower surface of the insulating cover 50 toward the bottom of the insulating holder 18, and the metal vapor in contact with the first cover side parallel rib 85 Since the flow can be changed into a branched flow, metal vapor can be diffused in the entire area of the first arc extinguishing space 45 with a simple configuration.
In addition, although the insulating cover 50 of 4th Embodiment was formed with the insulating synthetic resin which hydrogen gas generate | occur | produces when it fuses, when the insulating cover 50 made of ceramic is used, the 1st cover side parallel rib 85 of a ceramic is used. Since arcing can promote arc extinction by contacting the arc, arcing performance can be improved.

  Further, when the negative (-) terminal is connected to the first fixed contact 13 of the magnetic contactor 1 of the third embodiment and the positive (+) terminal is connected to the second fixed contact 14, A first arc between the first fixed contact 13a and the first movable contact 15a and a second arc between the second fixed contact 14a and the second movable contact 15b are generated toward the second outer wall 18b. Also in this case, the first arc and the second arc generated toward the second arc extinguishing space 46 are controlled by the second holder side parallel rib 82 provided in the second arc By being branched into the second inner wall 62 side and the second outer wall 18 b, the flow of the metal vapor is induced. For this reason, the first arc and the second arc can increase the cooling effect by increasing the contact area with the inner wall of the second arc extinction space 46, and can improve the arc extinction performance of the arc.

  In the first to fourth embodiments, the heights of the holder-side orthogonal ribs 63 to 68 and 75 to 80 or the holder-side parallel ribs 81 and 82 are not limited to the above-described embodiment and can be appropriately changed. Similarly, in the first embodiment and the fourth embodiment, the extension lengths of the holder-side orthogonal ribs 70 to 73 or the cover-side parallel ribs 85 and 86 are not limited to the above-described embodiment and can be appropriately changed.

DESCRIPTION OF SYMBOLS 1 electromagnetic contactor 2 1st case 3 2nd case 4 contact mechanism 5 electromagnet unit 6 contact storage case 7 square cylinder 7a flange 7 insulating substrate 9, 10 through hole 11, 12 conductor 13 first fixed contactor 13a first fixed contact 13b first conductive plate 13c second conductive plate 13d third conductive plate 14 second fixed contact 14a second fixed contact 14b first conductive plate 14c second conductive plate 14d third conductive Plate portion 15 movable contact 15a first movable contact 15b second movable contact 15c one side 15d of the movable contact in the width direction other side 15e of the movable contact in the width direction one side 15f of the movable contact in the longitudinal direction Other side 16 and 17 in the longitudinal direction of the movable contact cover 18 insulation holder 18a first outer wall 18b second outer wall 19a and 19b magnetic plate 21 upper magnetic yoke 22 movable plunger 22a circumferential edge 23 connecting shaft 24 through hole 25 flange 26 contact spring 27 C ring 27a spring receiver 27b C ring 28 magnetic yoke 29 fixed plunger 30 spool 31 central cylindrical portion 32 lower flange portion 33 upper flange portion 34 excitation coil 35 cap 35 a flange portion 36 Return spring 37 driving permanent magnet 38 through hole 39 auxiliary yoke 40 to 43 first to fourth permanent magnets for arc extinguishing 45 first arc extinguishing space 46 second arc extinguishing space 50 insulating cover 50 a, 50 b through hole 51 Airtight members 51a and 51b through holes 60 magnet support 61 first inner wall 62 second inner wall 63 to 65 first to third holder side orthogonal ribs 66 to 68 fourth to sixth holder side orthogonal ribs 70 to 73 first to first 4 cover side orthogonal ribs 75 to 77 first to third holder side orthogonal ribs 78 to 80 fourth -Sixth holder side orthogonal rib 81 first holder side parallel rib 82 second holder side parallel rib 85 first cover side parallel rib 86 second cover side parallel rib J1 first metal vapor flow J2 second metal vapor Flow J3 Third metal vapor flow J4 Fourth metal vapor flow J5 Fifth metal vapor flow J5a First branch flow J6 Sixth metal vapor flow J6b Second branch flow F1, F2 ... Lorentz force

Claims (8)

At least one pair of fixed contacts;
A movable contact disposed so as to be capable of coming into and coming out of contact with the pair of fixed contacts;
An insulating case that accommodates the fixed contact and the movable contact and is configured of a bottomed cylindrical insulating holder;
The insulating case includes an inner wall formed along a longitudinal direction of the movable contact, and at least one rib formed between the inner wall and an outer wall of the insulating case. mechanism.   The contact mechanism according to claim 1, wherein the insulating case further includes an insulating cover closing an opening of the insulating holder.   The contact mechanism according to claim 2, wherein an elastic member is disposed on an upper surface of the insulating cover.   The contact mechanism according to any one of claims 1 to 3, wherein the rib is formed so as to rise from the bottom surface of the insulating holder, and a plurality of the ribs are arranged perpendicularly to the inner wall. The ribs are formed to rise from the bottom surface of the insulating holder, and a plurality of the ribs are disposed orthogonal to the inner wall,
The insulating cover is formed with a cover-side rib extending toward the bottom of the insulating holder and disposed between the plurality of ribs orthogonal to the inner wall. The contact mechanism according to 3.   The contact mechanism according to any one of claims 1 to 3, wherein the rib is formed to rise from the bottom surface of the insulating holder and is disposed in parallel with the inner wall.   The contact mechanism according to claim 2 or 3, wherein the rib extends from the insulating cover toward the bottom of the insulating holder and is disposed parallel to the inner wall. A contact mechanism according to any one of claims 1 to 7, comprising:
An electromagnetic contactor in which a contact case housing the contact mechanism and an electromagnet unit portion driving the contact mechanism are sealed.

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