JP2015176810A - electromagnetic contactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic contactor in which insulation resistance can be enhanced between a pair of terminals for external connection, while suppressing the upsizing.SOLUTION: In an electromagnetic contactor 10, a pair of terminals 114, 114 for external connection consisting of a part of fixed contactors 111, 112, respectively, are projecting from a fixed contactor supporting insulation substrate 105, as the fixed contactor supporting insulation of a contact housing case 102, and the fixed contactor supporting insulation substrate 105 is provided with a protrusion 151, as a creepage distance elongation part 150 for elongating the creepage distance between the pair of terminals 114, 114 for external connection compared with the separation distance thereof, so as to traverse the pair of terminals 114, 114 for external connection.

Description

  The present invention relates to an electromagnetic contactor, and more particularly to a technique effective when applied to an electromagnetic contactor in which each external connection terminal portion of a pair of fixed contacts protrudes from a contact housing case.

  As an electromagnetic contactor that opens and closes a current path, for example, as disclosed in Patent Document 1, a pair of fixed contacts arranged at a predetermined distance can be contacted with the pair of fixed contacts. 2. Description of the Related Art There is known an electromagnetic contactor provided with a contact storage case that stores a contact mechanism composed of a movable contact arranged. In this electromagnetic contactor, a pair of fixed contacts are supported on a fixed contact support insulating part (fixed contact support insulating substrate, top plate) of the contact storage case, and a pair of fixed contact support support insulating parts of the contact storage case A pair of external connection terminal portions (supporting conductor portions) that are part of each of the fixed contacts are projected. And this electromagnetic contactor opens a contact by applying a voltage to the coil of the electromagnet to excite the electromagnet, and opens a contact by turning off the voltage of the coil and demagnetizing the electromagnet. The power supply source connected to one external connection terminal portion of the connection terminal portions and the load connected to the other external connection terminal portion are electrically energized or cut off. ing.

JP 2012-243593 A

By the way, in the structure in which the pair of external connection terminal portions protrude from the stationary contact support insulating portion of the contact housing case as in the above-described electromagnetic contactor, the insulation resistance between the pair of external connection terminal portions is electromagnetic contact. Therefore, it is necessary to improve the insulation resistance between the pair of external connection terminal portions corresponding to the voltage of the power supply source to be handled.
The insulation resistance between the pair of external connection terminal portions is improved by increasing the distance (arrangement pitch) between the pair of external connection terminal portions and extending the creeping distance between the pair of external connection terminal portions. Can do.

However, in recent years, there has been a demand for miniaturization of the magnetic contactor, and the method of simply extending the creepage distance by widening the distance between the pair of external connection terminal portions causes an increase in the size of the magnetic contactor. It is not preferable.
The objective of this invention is providing the electromagnetic contactor which can aim at the improvement of the insulation tolerance between a pair of terminal part for external connection, suppressing the enlargement.

  In order to achieve the above object, (1) an electromagnetic contactor according to an aspect of the present invention includes a pair of fixed contacts arranged at a predetermined distance and a part of each of the pair of fixed contacts. A contact housing case for housing a pair of external connection terminals, a movable contact arranged to be separable from the pair of fixed contacts, and a contact mechanism composed of the pair of fixed contacts and the movable contacts. And. The contact storage case has a fixed contact support insulating portion that supports the pair of fixed contacts, and each of the pair of external connection terminal portions is located above the outer surface of the fixed contact support insulating portion of the contact storage case. Protruding. Further, the stationary contact support insulating portion of the contact housing case has a creeping distance extending portion that extends (extends longer) the creeping distance between the pair of external connection terminal portions than the interval between the pair of external connection terminal portions. It is provided so as to cross between the pair of external connection terminal portions.

  According to the electromagnetic contactor according to one aspect of the present invention, the creeping distance between the pair of external connection terminal portions can be extended by the creeping distance extending portion rather than the distance between the pair of external connection terminal portions. The creeping distance between the pair of external connection terminal portions can be extended corresponding to the voltage of the power supply source to be handled without increasing the distance between the pair of external connection terminal portions. As a result, compared with a case where the distance between the pair of external connection terminals is simply increased to extend the creepage distance, the insulation resistance between the pair of external connection terminals is improved while suppressing an increase in size. An electromagnetic contactor can be provided.

(2) In the electromagnetic contactor described in the above means (1), the creeping distance extending portion is preferably formed by a protrusion protruding outward from the outer surface of the stationary contact support insulating portion.
According to the electromagnetic contactor according to one aspect of the present invention, the creeping distance between the pair of external connection terminal portions can be changed according to the protrusion amount of the protrusion, and therefore corresponds to the voltage of the power supply source to be handled. By changing the protrusion amount of the protrusion, the creeping distance between the pair of external connection terminal portions can be easily changed.
In addition, according to the electromagnetic contactor according to one aspect of the present invention, a step is formed between the pair of external connection terminal portions, so that adhesion of foreign matter between the pair of external connection terminal portions is suppressed. It is possible to suppress a short circuit caused by foreign matter between the pair of external connection terminal portions.

(3) In the electromagnetic contactor according to the above-described means (2), the fixed contact support insulating part has two sides located on opposite sides, and the protrusion is the 2 of the fixed contact support insulating part. It preferably extends over one side.
(4) In the electromagnetic contactor described in the above means (2), the protrusion is preferably formed so as to surround any one of the pair of external connection terminal portions.

(5) In the electromagnetic contactor described in the above means (1), the creeping distance extending portion is preferably formed by a groove recessed inward from the outer surface of the fixed contact support insulating portion.
According to the electromagnetic contactor according to one aspect of the present invention, the creepage distance between the pair of external connection terminal portions can be changed according to the depth of the groove. Correspondingly, the creeping distance between the pair of external connection terminal portions can be easily changed by changing the protrusion amount of the protrusion.
In addition, according to the electromagnetic contactor according to one aspect of the present invention, a step due to the groove is formed between the pair of external connection terminal portions, thereby suppressing adhesion of foreign matter between the pair of external connection terminal portions. It is possible to suppress a short circuit caused by foreign matter between the pair of external connection terminal portions.

(6) In the electromagnetic contactor according to the above-mentioned means (5), the fixed contact support insulating part has two sides located on opposite sides, and the groove is two of the fixed contact support insulating part. It is preferable that it extends over the side.
(7) In the electromagnetic contactor described in the above means (5), the groove is preferably formed so as to surround one of the pair of external connection terminal portions.

  ADVANTAGE OF THE INVENTION According to this invention, the electromagnetic contactor which can aim at the improvement of the insulation tolerance between a pair of terminal part for external connection can be provided, suppressing enlargement.

It is sectional drawing which shows schematic structure of the electromagnetic contactor which concerns on Embodiment 1 of this invention. It is sectional drawing which expands and shows a part of contact device on the AA line of FIG. It is sectional drawing on the BB line of FIG. It is a perspective view which shows schematic structure of the contact storage case of FIG. It is a perspective view of the contact storage case of the electromagnetic contactor which concerns on the modification of Embodiment 1 of this invention. It is sectional drawing which shows schematic structure of the electromagnetic contactor which concerns on Embodiment 2 of this invention. It is a perspective view which shows schematic structure of the contact storage case of FIG. It is sectional drawing which shows schematic structure of the electromagnetic contactor which concerns on Embodiment 3 of this invention. It is a perspective view which shows schematic structure of the contact storage case of FIG. It is a perspective view of the contact storage case of the electromagnetic contactor which concerns on the modification of Embodiment 3 of this invention. It is sectional drawing which shows schematic structure of the electromagnetic contactor which is Embodiment 4 of this invention. It is a perspective view which shows schematic structure of the contact storage case of FIG.

Embodiments according to the present invention will be described below in detail with reference to the drawings.
Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiments of the invention, and the repetitive description thereof is omitted.
In all the drawings for explaining the embodiments of the invention, the first and second directions orthogonal to each other in the same plane may be referred to as an X direction and a Y direction, respectively. In addition, the third direction orthogonal to each of the first and second directions may be referred to as the Z direction.

(Embodiment 1)
In the first embodiment, an example in which the present invention is applied to an electromagnetic contactor having a contact housing case in which a fixed contact support insulating portion is formed of a fixed contact support insulating substrate will be described.
In the first embodiment, an example in which a creeping distance extending portion that extends a creeping distance between a pair of external connection terminal portions is formed by a protrusion rather than a distance between the pair of external connection terminal portions will be described.
Hereinafter, the electromagnetic contactor according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 4.

As shown in FIGS. 1 to 3, the electromagnetic contactor 10 according to the present embodiment includes a contact device 100 in which a contact mechanism 101 is disposed, and an electromagnet unit 200 that drives the contact device 100.
As is apparent from FIGS. 1 to 3, the contact device 100 includes a contact storage case 102 that stores the contact mechanism 101. The contact housing case 102 includes a metal rectangular tube 103 made of a metal material, a flat fixed contact supporting insulating substrate 105 made of an insulating ceramic material, and an insulating tube 140 made of an insulating material. I have.
Here, the fixed contact support insulating substrate 105 corresponds to the fixed contact support insulating portion of the contact storage case of the present invention.
The metal rectangular cylinder 103 has a flange portion 104 protruding outward at the lower end portion thereof. The metal rectangular tube 103 has a flange portion 104 fixed to an upper magnetic yoke 210 of an electromagnet unit 200 described later by seal bonding.

  The fixed contact support insulating substrate 105 has an outer surface 105x (upper surface) and an inner surface 105y (lower surface) located on opposite sides in the Z direction orthogonal to the X direction and the Y direction. The fixed contact support insulating substrate 105 is fixed to the metal square tube 103 so as to close the upper end of the upper end and the lower end located on the opposite sides of the metal square tube 103 in the Z direction. Through holes 106 and 107 through which a pair of fixed contacts 111 and 112 to be described later are inserted are formed at a central portion of the fixed contact supporting insulating substrate 105 at a predetermined interval. The inner surface 105y of the fixed contact supporting insulating substrate 105 is fixed to the metal rectangular cylinder 103 by seal bonding.

  As shown in FIG. 1, the contact mechanism 101 includes a pair of fixed contacts 111 and 112 that are inserted into and fixed to the through holes 106 and 107 of the fixed contact support insulating substrate 105 of the contact storage case 102. Each of these fixed contacts 111 and 112 is connected to the external connection terminal portion 114 inserted into the through holes 106 and 107 of the fixed contact supporting insulating substrate 105 and the external connection terminal portion 114 to be in fixed contact. And a C-shaped main body 115 disposed on the inner surface 105y side of the child support insulating substrate 105. The external connection terminal portion 114 has a flange portion protruding outward at the upper end thereof, and this flange portion is fixed to the outer surface 105x of the fixed contact support insulating substrate 105 by seal bonding. The C-shaped main body 115 is configured to open the inner side.

That is, in the electromagnetic contactor 10 according to the first embodiment, the pair of fixed contacts 111 and 112 are supported by the fixed contact support insulating substrate 105 of the contact storage case 102. Moreover, the electromagnetic contactor 10 of this Embodiment 1 has a pair of external connection terminal parts 114 and 114 which consist of a part of each of a pair of fixed contacts 111 and 112, and this pair of external connection terminal parts Each of 114 and 114 has a structure that protrudes upward from the outer surface 105 x of the stationary contact support insulating substrate 105 of the contact housing case 102.
The C-shaped main body 115 includes an upper plate portion 116 that extends outward along the inner surface 105 y of the fixed contact supporting insulating substrate 105, and an intermediate plate portion that extends downward from the outer end portion of the upper plate portion 116. 117 and a lower plate portion 118 extending inward from the lower end side of the intermediate plate portion 117 in parallel with the upper plate portion 116, that is, in the facing direction of the pair of fixed contacts 111 and 112. The upper plate portion 116 is added to the L shape formed by the portion 117 and the lower plate portion 118 and is formed in a C shape.

Here, the terminal portion for external connection 114 and the C-shaped main body portion 115 are formed on the upper plate portion 116 of the C-shaped main body portion 115 with a pin 114a protruding from the lower end surface of the terminal portion for external connection 114. For example, it is fixed by brazing in a state of being inserted into the through hole 120. The fixing of the external connection terminal portion 114 and the C-shaped main body portion 115 is not limited to brazing or the like, but the pin 114a is fitted into the through hole 120, or a male screw is formed on the pin 114a, and the through hole 120 is fixed. An internal thread may be formed and both may be screwed together.
An insulating cover 121 made of a synthetic resin material that restricts the generation of an arc is attached to each C-shaped main body 115 of the pair of fixed contacts 111 and 112. The insulating cover 121 covers the inner peripheral surfaces of the upper plate portion 116 and the intermediate plate portion 117 of the C-shaped main body portion 115.

Thus, by attaching the insulating cover 121 to the C-shaped main body 115 of the fixed contacts 111 and 112, only the upper surface side of the lower plate portion 118 is exposed on the inner peripheral surface of the C-shaped main body 115. The contact portion 118a.
In the contact housing case 102, a movable contact 130 is disposed so that both ends are disposed in the C-shaped main body 115 of each of the pair of fixed contacts 111 and 112. At both ends of the movable contact 130, contact portions 130a are provided so as to face the contact portions 118a of the pair of fixed contacts 111 and 112, respectively.

The movable contact 130 is supported by a connecting shaft 131, and this connecting shaft 131 is fixed to a movable plunger 215 of an electromagnet unit 200 described later. The movable contact 130 has a recess 132 in the center of which the vicinity of the connecting shaft 131 protrudes downward. A through hole 133 through which the connecting shaft 131 is inserted is formed in the recess 132.
The connecting shaft 131 is formed with a flange 131a protruding outward at the upper end thereof. The connecting shaft 131 is inserted through the contact spring 134 from the lower end side, and then is inserted through the through hole 133 of the movable contact 130 to bring the upper end of the contact spring 134 into contact with the flange portion 131a. It is positioned by, for example, a C ring (not shown) so as to obtain an urging force.

The movable contact 130 is disposed so as to be separated from each of the pair of fixed contacts 111 and 1112. In the released state, the movable contact 130 is in a state in which the contact portions 130a at both ends are separated from the contact portions 118a of the pair of fixed contacts 111 and 112 at a predetermined interval. Further, the movable contact 130 is set so that the contact portions 130a at both ends come into contact with the contact portions 118a of the pair of fixed contacts 111 and 112 at a predetermined contact pressure by the contact spring 134 in the closing position. Yes.
As shown in FIGS. 1 to 3, the insulating cylinder 140 constituting the contact housing case 102 is formed into a bottomed square cylinder with an open upper end made of synthetic resin, for example. The insulating cylinder 140 has magnet storage pockets 141 and 142 that protrude inward at positions facing the side surfaces of the movable contact 130. In the magnet storage pockets 141 and 142, arc extinguishing permanent magnets 143 and 144 are inserted and fixed.

Each of the arc extinguishing permanent magnets 143 and 144 is magnetized so that opposing surfaces thereof have the same polarity, for example, N pole, in the thickness direction. Arc extinguishing chambers 145 and 146 are formed on the outer sides in the X direction of the magnet storage pockets 141 and 142, respectively.
As shown in FIG. 1, the electromagnet unit 200 includes a U-shaped magnetic yoke 201 that is flat when viewed from the side. A cylindrical auxiliary yoke 203 is fixed to the center portion of the bottom plate portion 202 of the magnetic yoke 201. A spool 204 as a plunger driving unit is disposed outside the cylindrical auxiliary yoke 203.

The spool 204 includes a central cylindrical portion 205 that passes through the cylindrical auxiliary yoke 203, a lower flange portion 206 that protrudes radially outward from the lower end portion of the central cylindrical portion 205, and a slightly lower position than the upper end of the central cylindrical portion 205. The upper flange portion 207 protrudes radially outward from the side. An exciting coil 208 is wound around a storage space formed by the central cylindrical portion 205, the lower flange portion 206, and the upper flange portion 207.
An upper magnetic yoke 210 is fixed to an upper end that is an open end of the magnetic yoke 201. A through hole 210 a that faces the central cylindrical portion 205 of the spool 204 is formed in the central portion of the upper magnetic yoke 210.

In the central cylindrical portion 205 of the spool 204, a movable plunger 215 having a return spring 214 disposed between the bottom portion and the bottom plate portion 202 of the magnetic yoke 201 is slidably disposed. The movable plunger 215 is formed with a peripheral flange portion 216 protruding outward in the radial direction at an upper end portion protruding upward from the upper magnetic yoke 210.
On the upper surface of the upper magnetic yoke 210, an annular permanent magnet 220 formed in an annular shape is fixed so as to surround the peripheral flange portion 216 of the movable plunger 215. The annular permanent magnet 220 has a rectangular outer shape, and has a through hole 221 that surrounds the peripheral flange 216 at the center. The annular permanent magnet 220 is magnetized so that the upper end side is, for example, an N pole and the lower end side is an S pole in the vertical direction, that is, the thickness direction. The shape of the through-hole 221 of the annular permanent magnet 220 is a shape that matches the shape of the peripheral flange portion 216, and the shape of the outer peripheral surface can be any shape such as a circle or a rectangle. Similarly, the outer shape of the annular permanent magnet 220 is not limited to a rectangular shape, but may be any shape such as a circle or a hexagon.
An auxiliary yoke 225 having the same outer shape as the annular permanent magnet 220 is fixed to the upper end surface of the annular permanent magnet 220.

As shown in FIG. 1, the movable plunger 215 is covered with a cap 230 made of a nonmagnetic material and having a bottomed cylindrical shape.
As shown in FIG. 1, the movable plunger 215 is covered with a cap 230 made of a nonmagnetic material and having a bottomed cylindrical shape. A flange portion 231 formed to extend outward in the radial direction is provided at the open end of the cap 230. The flange portion 231 is fixed to the lower surface of the upper magnetic yoke 210 by seal bonding. That is, the electromagnetic contactor 10 of Embodiment 1 has a sealed container in which the inside of the contact housing case 102 and the inside of the cap 230 are communicated with each other via the through hole 210a of the upper magnetic yoke 210. A gas such as hydrogen gas, nitrogen gas, a mixed gas of hydrogen and nitrogen, air, or SF ₆ is sealed inside the sealed container formed by the contact housing case 102, the upper magnetic yoke 210, and the cap 230. .

Next, operation | movement of the electromagnetic contactor 10 of this Embodiment 1 is demonstrated.
Now, it is assumed that the fixed contact 111 is connected to a power supply source that supplies a large current, for example, and the fixed contact 112 is connected to a load.
In this state, it is assumed that the exciting coil 208 in the electromagnet unit 200 is in a non-excited state and the electromagnet unit 200 is in a released state in which no exciting force for lowering the movable plunger 215 is generated. In this released state, the movable plunger 215 is urged upward by the return spring 214 away from the upper magnetic yoke 210.

At the same time, the attractive force due to the magnetic force of the annular permanent magnet 220 is applied to the auxiliary yoke 225, and the peripheral flange portion 216 of the movable plunger 215 is attracted. For this reason, the upper surface of the peripheral flange portion 216 of the movable plunger 215 is in contact with the lower surface of the step plate portion of the auxiliary yoke 225.
For this reason, the contact part 130a of the movable contact 130 of the contact mechanism 101 connected to the movable plunger 215 via the connection shaft 131 is spaced apart from the contact part 118a of the fixed contacts 111 and 112 upward by a predetermined distance. . For this reason, the current path between the stationary contacts 111 and 112 is in a disconnected state, and the contact mechanism 101 is in an open state.

Thus, in the released state, both the urging force by the return spring 214 and the attractive force by the annular permanent magnet 220 are acting on the movable plunger 215, so that the movable plunger 215 is inadvertently caused by external vibration or impact. Therefore, it is possible to reliably prevent malfunction.
When the exciting coil 208 of the electromagnet unit 200 is energized from this released state, an exciting force is generated by the electromagnet unit 200 and the movable plunger 215 is resisted against the biasing force of the return spring 214 and the attractive force of the annular permanent magnet 220. Press down.

As described above, when the movable plunger 215 is lowered, the movable contact 130 connected to the movable plunger 215 via the connecting shaft 131 is also lowered, and the contact portion 130a thereof is the contact portion 118a of the fixed contacts 111 and 112. In contact with the contact pressure of the contact spring 134.
Therefore, a closed state is reached in which a large current from the external power supply source is supplied to the load through the fixed contact 111, the movable contact 130, and the fixed contact 112.
At this time, an electromagnetic repulsive force is generated between the fixed contacts 111 and 112 and the movable contact 130 in a direction for opening the movable contact 130.

However, as shown in FIG. 1, the fixed contactors 111 and 112 have the C-shaped main body portion 115 formed by the upper plate portion 116, the intermediate plate portion 117, and the lower plate portion 118. A current in the reverse direction flows between the lower plate portion 118 and the movable contact 130 facing the lower plate portion 118.
Therefore, from the relationship between the magnetic field formed by the lower plate portion 118 of the fixed contacts 111 and 112 and the current flowing through the movable contact 130, the movable contact 130 is connected to the contact portion 118a of the fixed contacts 111 and 112 according to Fleming's left-hand rule. The Lorentz force that presses against the surface can be generated.

By this Lorentz force, it becomes possible to resist the electromagnetic repulsion force in the opening direction generated between the contact portions 118a of the fixed contacts 111 and 112 and the contact portion 130a of the movable contact 130, and the contact portion of the movable contact 130 It is possible to reliably prevent the 130a from opening.
For this reason, the pressing force of the contact spring 134 that supports the movable contact 130 can be reduced, and the thrust generated by the exciting coil 208 can be reduced accordingly, and the configuration of the entire electromagnetic contactor can be reduced in size. can do.
When the current supply to the load is cut off from the closed state of the contact mechanism 101, the excitation of the excitation coil 208 of the electromagnet unit 200 is stopped.

As a result, the exciting force that moves the movable plunger 215 downward by the electromagnet unit 200 disappears, so that the movable plunger 215 rises by the urging force of the return spring 214, and the annular permanent magnet 216 as the peripheral flange 216 approaches the auxiliary yoke 225. The suction force of 220 increases.
As the movable plunger 215 rises, the movable contact 130 connected via the connecting shaft 131 rises. In response to this, the movable contact 130 is in contact with the stationary contacts 111 and 112 while the contact pressure is applied by the contact spring 134. After that, when the contact pressure of the contact spring 134 disappears, the movable contact 130 is in an open state in which it is separated upward from the fixed contacts 111 and 112.

In this open state, an arc is generated between the contact part 118a of the fixed contacts 111 and 112 and the contact part 130a of the movable contact 130, and the current conduction state is continued by this arc.
At this time, since the insulating cover 121 that covers the upper plate portion 116 and the intermediate plate portion 117 of the C-shaped main body 115 of the fixed contacts 111 and 112 is mounted, the arc is connected to each of the pair of fixed contacts 111 and 112. Can be generated only between the contact portion 118a of the movable contact 130 and the contact portion 130a of the movable contact 130. For this reason, the generation | occurrence | production state of an arc can be stabilized, the arc 149 can be extended to the arc extinguishing chamber 145 or 146, and can be extinguished, and arc extinguishing performance can be improved.

Further, since the upper plate portion 116 and the intermediate plate portion 117 of the C-shaped main body portion 115 are covered with the insulating cover 121, both end portions of the movable contact 130 and the upper plate portion 116 and the middle portion of the C-shaped main body portion 115 are arranged. An insulating distance can be secured by the insulating cover 121 between the plate portions 117, and the height of the movable contact 130 in the movable direction can be shortened.
Furthermore, since the inner surface of each intermediate plate 117 of the pair of fixed contacts 111 and 112 is covered with the magnetic plate 119, the magnetic plate 119 generates a magnetic field generated by the current flowing through the intermediate plate 117. Shielded. For this reason, the magnetic field generated by the arc generated between the contact portions 118a of the pair of fixed contacts 111 and 112 and the contact portion 130a of the movable contact 130 interferes with the magnetic field generated by the current flowing through the intermediate plate portion 117. In other words, it is possible to prevent the arc from being affected by the magnetic field generated by the current flowing through the intermediate plate portion 117.

Next, the configuration of the electromagnetic contactor 10 according to the first embodiment will be further described with reference to FIGS. 1 and 4.
As shown in FIGS. 1 and 4, the pair of external connection terminal portions 114 and 114 are arranged along the X direction. The fixed contact support insulating substrate 105 of the contact housing case 102 has two sides 105a and 105b located on opposite sides in the Y direction. Further, the creeping distance between the pair of external connection terminal portions 114 and 114 is larger than the distance (arrangement pitch) between the pair of external connection terminal portions 114 and 114 on the fixed contact supporting insulating substrate 105 of the contact housing case 102. A creeping distance extending portion 150 is provided so as to cross between the pair of external connection terminal portions 114 and 114.

  In the first embodiment, the creeping distance extending portion 150 is formed by a protrusion 151 protruding upward from the outer surface 105 x of the fixed contact supporting insulating substrate 105. The protrusion 151 extends over two sides 105 a and 105 b located on opposite sides of the fixed contact supporting insulating substrate 105 in the Y direction, and is formed in a stripe shape, for example. The protrusion 151 is formed integrally with the fixed contact supporting insulating substrate 105 and is formed of the same material as the fixed contact supporting insulating substrate 105.

Here, the creeping distance between the pair of external connection terminal portions 114 and 114 is the shortest distance along the surface of the insulator between the pair of external connection terminal portions 114 and 114. In the first embodiment, the creeping distance extending portion 150 is formed by the protrusion 151 made of the same insulating ceramic material as the fixed contact supporting insulating substrate 105, and therefore, between the pair of external connection terminal portions 114 and 114, The shortest distance along the surface on the outer surface 105x side of the fixed contact supporting insulating substrate 105 including the surface of the protrusion 151 is the creeping distance. Therefore, the creepage distance between the pair of external connection terminal portions 114 and 114 can be extended by the creepage distance extending portion 150 rather than the distance between the pair of external connection terminal portions 114 and 114. The creepage distance between the pair of external connection terminal portions 114 and 114 can be extended without increasing the distance between the terminal portions 114 and 114.
Further, the creeping distance between the pair of external connection terminal portions 114 and 114 can be changed according to the protrusion amount of the protrusion 151.

Next, the effect of the first embodiment will be described.
As described above, the electromagnetic contactor 10 according to the first embodiment includes a pair of external connection terminals including a part of each of the pair of fixed contacts 111 and 112 from the fixed contact support insulating substrate 105 of the contact storage case 102. The parts 114 and 114 protrude. In such a structure, since the insulation resistance between the pair of external connection terminal portions 114 and 114 affects the reliability of the electromagnetic contactor 10, the pair of external connection terminals corresponds to the voltage of the power supply source to be handled. It is necessary to improve the insulation resistance between the portions 114 and 114.

The insulation resistance between the pair of external connection terminal portions 114 and 114 increases the interval (arrangement pitch) between the pair of external connection terminal portions 114 and 114, and creeps between the pair of external connection terminal portions 114 and 114. It can be improved by extending the distance.
However, in recent years, there has been a demand for miniaturization of the electromagnetic contactor, and the method of simply extending the distance between the pair of external connection terminal portions 114 and 114 to increase the creeping distance leads to an increase in the size of the electromagnetic contactor 10. Since it becomes a factor, it is not preferable.
On the other hand, the electromagnetic contactor 10 according to the first embodiment has a pair of contacts on the stationary contact supporting insulating substrate 105 of the contact housing case 102 that is more paired than the distance (arrangement pitch) between the pair of external connection terminal portions 114 and 114. A protrusion 151 as a creeping distance extending portion 150 that extends the creeping distance between the external connection terminal portions 114 and 114 is provided so as to cross between the pair of external connection terminal portions 114 and 114.

  Therefore, according to the electromagnetic contactor 10 of the first embodiment, the creepage distance between the pair of external connection terminal portions 114 and 114 is set to be the creepage distance extending portion 150 rather than the distance between the pair of external connection terminal portions 114 and 114. Therefore, the creepage distance between the pair of external connection terminals 114 and 114 corresponding to the voltage of the power supply source to be handled without increasing the distance between the pair of external connection terminals 114 and 114. Can be stretched. As a result, according to the electromagnetic contactor 10 of the first embodiment, compared with a case where the creeping distance is extended by simply widening the distance between the pair of external connection terminal portions 114 and 114, the electromagnetic contactor 10 The insulation resistance between the pair of external connection terminal portions 114 and 114 can be improved while suppressing an increase in size.

In addition, as described above, the electromagnetic contactor 10 according to the first embodiment is formed with the protrusion 151 that the creeping distance extending portion 150 protrudes outward from the outer surface 105x of the fixed contact support insulating substrate 105.
Therefore, according to the electromagnetic contactor 10 of the first embodiment, the creeping distance between the pair of external connection terminal portions 114 and 114 can be changed according to the protrusion amount of the protrusion 151. The creeping distance between the pair of external connection terminal portions 114 and 114 can be easily changed by changing the protrusion amount of the protrusion 151 corresponding to the high voltage.

Further, according to the electromagnetic contactor 10 of the first embodiment, a step due to the protrusion 151 is formed between the pair of external connection terminal portions 114 and 114, so that the foreign matter between the pair of external connection terminal portions 114 and 114 is formed. Can be suppressed, and a short circuit caused by foreign matter between the pair of external connection terminal portions 114 and 114 can be suppressed.
In the first embodiment described above, the protrusion 151 as the creeping distance extending portion 150 extends over the two sides 105 a and 105 b located on the opposite sides in the Y direction of the fixed contact supporting insulating substrate 105. As described above, the protrusions 151 are arranged such that both ends in the Y direction (longitudinal direction) are located on the inner side of the two sides 105a and 105b that are located on the opposite sides in the Y direction of the fixed contact supporting insulating substrate 105. May be. However, also in this case, it is preferable that the protrusion 151 extends across the pair of external connection terminal portions 114 and 114.

In the first embodiment, the case where one protrusion 151 is provided as the creeping distance extending portion 150 between the pair of external connection terminal portions 114 and 114 has been described. However, the present invention is not limited to this. Instead, two or more protrusions 151 may be provided between the pair of external connection terminal portions 114 and 114. In this case, compared to the first embodiment in which the creeping distance extending portion 150 is formed by one protrusion 151, the pair of external connection terminal portions 114 is larger than the distance between the pair of external connection terminal portions 114 and 114. And the creepage distance between 114 and 114 can be further extended.
In the first embodiment, the case where the protrusion 151 as the creeping distance extending portion 150 is formed in a stripe shape has been described. However, the protrusion 151 crosses between the pair of external connection terminal portions 114 and 114 while meandering. You may extend as follows.

Next, a modified example of the first embodiment will be described with reference to FIG.
In the first embodiment described above, the protrusion 151 as the creeping distance extending portion 150 is formed across the two sides 105 a and 105 b located on the opposite sides in the Y direction of the fixed contact supporting insulating substrate 105.
On the other hand, in the modified example of the first embodiment, as shown in FIG. 5, the protrusion 151 as the creeping distance extending portion 150 individually surrounds each of the pair of external connection terminal portions 114 and 114. Is provided. In this modification, the protrusion 151 is formed in an annular shape that continuously extends around the external connection terminal portion 114.

  As described above, also in the present modification in which the protrusion 151 as the creeping distance extending portion 150 is individually provided so as to surround each of the pair of external connection terminal portions 114 and 114, the pair of external connection terminal portions 114 and 114 are also provided. Since the protrusion 151 crosses the gap, the creepage distance between the pair of external connection terminal portions 114 and 114 is longer than the distance between the pair of external connection terminal portions 114 and 114 as in the first embodiment. The portion 150 can be extended. Thereby, also in this modification, the insulation tolerance between a pair of external connection terminal parts 114 and 114 can be improved while suppressing the enlargement of the electromagnetic contactor 10.

Also in the present modification, the creepage distance between the pair of external connection terminal portions 114 and 114 can be changed according to the protrusion amount of the protrusion 151, as in the first embodiment, so that the power supply to be handled The creeping distance between the pair of external connection terminal portions 114 and 114 can be easily changed by changing the protrusion amount of the protrusion 151 corresponding to the high voltage of the source.
Also in this modification, since the adhesion of the foreign matter between the pair of external connection terminal portions 114 and 114 can be suppressed by the protrusion 151, a short circuit due to insulation deterioration between the pair of external connection terminal portions 114 and 114. Can be suppressed.

In the above-described modification of the first embodiment, the case where the protrusion 151 as the creeping distance extending portion 150 is individually provided so as to surround each of the pair of external connection terminal portions 114 and 114 has been described. The present invention is not limited to this, and any one of the pair of external connection terminal portions may be surrounded by the protrusion 151 as the creeping distance extending portion 150.
Even in this case, since the protrusion 151 crosses between the pair of external connection terminal portions 114 and 114, the same effect as in the first embodiment can be obtained.

In the first embodiment and the modification thereof, the case where the fixed contact support insulating substrate 105 and the protrusion 151 are integrally formed has been described. However, the present invention is not limited to this, and the fixed contact support is supported. The insulating substrate 105 and the protrusion 151 may be formed separately, and then the protrusion 151 may be bonded and fixed to the fixed contact supporting insulating substrate 105. In this case, the protrusions 151 can be provided on the existing fixed contact supporting insulating substrate 105.
In the first embodiment, the protrusion 151 is formed in a stripe shape, and in the modification of the first embodiment, the protrusion 151 is formed in an annular shape. However, the stripe-shaped protrusion 151 is an annular protrusion. Compared to 151, it is easy to manufacture with a simple shape.

(Embodiment 2)
In the first embodiment, the protrusion 151 forms the creeping distance extending portion 150 that extends the creeping distance between the pair of external connection terminal portions 114 and 114 more than the distance between the pair of external connection terminal portions 114 and 114. Although the case has been described, in the second embodiment, the case where the creeping distance extension 150 is formed by the groove 152 will be described with reference to FIGS. 6 and 7.
As shown in FIGS. 6 and 7, the electromagnetic contactor 10 </ b> A of the second embodiment has substantially the same configuration as that of the first embodiment described above, but the interval between the pair of external connection terminal portions 114 and 114. Further, the configuration of the creeping distance extending portion 150 that extends the creeping distance between the pair of external connection terminal portions 114 and 114 is different.
That is, in the second embodiment, the creeping distance extending portion 150 is formed by the groove 152 that is recessed inward from the outer surface 105x of the fixed contact supporting insulating substrate 105. The groove 152 extends over two sides 105 a and 105 b located on opposite sides of the fixed contact supporting insulating substrate 105 in the Y direction, and is formed in a stripe shape, for example.

Here, in the second embodiment, the creeping distance extending portion 150 is formed by the groove 152 recessed inward from the outer surface 105x of the fixed contact supporting insulating substrate 105, so that the pair of external connection terminal portions 114 and The shortest distance along the surface on the outer surface 105x side of the fixed contact supporting insulating substrate 105 including the inner surface of the groove 152 between the 114 is the creeping distance. Therefore, also in the second embodiment, the creepage distance between the pair of external connection terminal portions 114 and 114 can be extended by the creepage distance extending portion 150 rather than the interval between the pair of external connection terminal portions 114 and 114. Therefore, the creeping distance between the pair of external connection terminal portions 114 and 114 can be extended without increasing the distance between the pair of external connection terminal portions 114 and 114.
Further, the creeping distance between the pair of external connection terminal portions 114 and 114 can be changed according to the depth of the groove 152.

As described above, the electromagnetic contactor 10A according to the second embodiment has a pair of contacts on the stationary contact support insulating substrate 105 of the contact housing case 102 that are more paired than the distance between the pair of external connection terminal portions 114 and 114 (arrangement pitch). A groove 152 as a creeping distance extending portion 150 that extends the creeping distance between the external connection terminal portions 114 and 114 is provided so as to cross between the pair of external connection terminal portions 114 and 114.
Therefore, according to the electromagnetic contactor 10A of the second embodiment, as in the first embodiment, the distance between the pair of external connection terminal portions 114 and 114 is larger than the distance between the pair of external connection terminal portions 114 and 114. The creeping distance can be extended by the creeping distance extension part 150, so that the pair of external connections can be made corresponding to the high voltage of the power supply source to be handled without increasing the distance between the pair of external connection terminal parts 114 and 114. The creepage distance between the terminal portions 114 and 114 can be extended. As a result, also in the electromagnetic contactor 10A according to the second embodiment, the large size of the electromagnetic contactor 10A compared to the case where the distance between the pair of external connection terminal portions 114 and 114 is simply increased to extend the creeping distance. It is possible to improve the insulation resistance between the pair of external connection terminal portions 114 and 114 while suppressing the increase in the resistance.

Further, in the electromagnetic contactor 10 </ b> A of the second embodiment, the creeping distance extending portion 150 is formed by a groove 152 that is recessed inward from the outer surface 105 x of the fixed contact supporting insulating substrate 105.
Therefore, according to the electromagnetic contactor 10A of the second embodiment, the creeping distance between the pair of external connection terminal portions 114 and 114 can be changed according to the depth amount of the groove 152. The creeping distance between the pair of external connection terminal portions 114 and 114 can be easily changed by changing the depth of the groove 152 corresponding to the high voltage of the source.
Further, according to the electromagnetic contactor 10A of the second embodiment, a step due to the groove 152 is formed between the pair of external connection terminal portions 114 and 114, so that the foreign matter between the pair of external connection terminal portions 114 and 114 is formed. Can be suppressed, and a short circuit due to insulation deterioration between the pair of external connection terminal portions 114 and 114 can be suppressed.

  In the above-described second embodiment, the groove 152 as the creeping distance extending portion 150 extends over the two sides 105 a and 105 b located on the opposite sides in the Y direction of the fixed contact supporting insulating substrate 105. However, both ends of the groove 152 in the Y direction (longitudinal direction) are positioned on the inner side of the two sides 105a and 105b that are opposite to each other in the Y direction of the fixed contact supporting insulating substrate 105. Also good. However, even in this case, the groove 152 is preferably extended so as to cross between the pair of external connection terminal portions 114 and 114.

  In the above-described second embodiment, the case where one groove 152 is provided as the creeping distance extending portion 150 between the pair of external connection terminal portions 114 and 114 has been described, but the present invention is limited to this. Instead, two or more grooves 152 may be provided between the pair of external connection terminal portions 114 and 114. In this case, as compared with the first embodiment in which the creeping distance extending portion 150 is formed by one groove 152, the pair of external connection terminal portions 114 and 114 is larger than the distance between the pair of external connection terminal portions 114 and 114. The creepage distance between them can be further extended.

In the second embodiment, the groove 152 as the creeping distance extending portion 150 extends over the two sides 105 a and 105 b located on opposite sides in the Y direction of the fixed contact supporting insulating substrate 105. Although described, the present invention is not limited to this, and at least one of the pair of external connection terminal portions 114 and 114 is used as the creeping distance extending portion 150 as in the modification of the first embodiment. It may be surrounded by the groove 152. Even in this case, since the groove 152 crosses between the pair of external connection terminal portions 114 and 114, the same effect as in the first embodiment can be obtained.
In the second embodiment described above, the case where the groove 152 as the creeping distance extending portion 150 is formed in a stripe shape has been described. However, the groove 152 crosses between the pair of external connection terminal portions 114 and 114 while meandering. You may extend as follows.

(Embodiment 3)
In the third embodiment, an example in which the present invention is applied to an electromagnetic contactor having a contact housing case in which a stationary contact support insulating portion is formed of a top plate portion will be described with reference to FIGS. 8 and 9.
In the third embodiment, an example will be described in which a creeping distance extending portion that extends a creeping distance between a pair of external connection terminal portions is formed by a protrusion rather than a distance between the pair of external connection terminal portions.

As shown in FIGS. 8 and 9, the electromagnetic contactor 10 </ b> B of the third embodiment has substantially the same configuration as that of the first embodiment described above, but the configuration of the contact housing case 102 </ b> A is different.
In the third embodiment, the contact storage case 102 </ b> A includes a bowl-like body 303 in which the top plate 302 is integrally formed with the square tube body 301 so as to close the upper end of the square tube body 301, and an opening of the bowl-like body 303. A frame-like connection member 304 disposed on the end surface side and an insulating cylinder 305 disposed inside the connection member 304 are provided.
A metal foil is formed on the open end surface side of the bowl-shaped body 303 by metallization, and the upper end portion of the connection member 304 is fixed to the metal foil by seal bonding. The connecting member 304 has a flange portion protruding outward at a lower end portion opposite to the upper end portion, and the flange portion is fixed to the upper magnetic yoke 210 by seal bonding. The bowl 303 is made of, for example, insulating ceramics or insulating synthetic resin. The connecting member 304 is made of a metal material, and the insulating cylinder 305 is made of an insulating material.

Here, the top plate portion 302 of the contact storage case 102A corresponds to the fixed contact support insulating portion of the contact storage case of the present invention.
Through holes 306 and 307 through which the pair of fixed contacts 111 and 112 are inserted are formed at the center of the top plate 302 at a predetermined interval. In each of the pair of through holes 306 and 307, a pair of external connection terminal portions 114 and 114 made of a part of each of the pair of fixed contacts 111 and 112 are inserted, as in the first embodiment. Yes.
That is, in the electromagnetic contactor 10B of Embodiment 3, the pair of fixed contacts 111 and 112 are supported by the top plate 302 of the contact housing case 102A. In addition, the electromagnetic contactor 10B of the third embodiment has a pair of external connection terminal portions 114 and 114 that are part of each of the pair of fixed contacts 111 and 112, and the pair of external connection terminal portions. Each of 114 and 114 has a structure that protrudes upward from the outer surface 302x of the top plate 302 of the contact housing case 102A.

Further, the electromagnetic contactor 10B according to the third embodiment is a sealed container in which the inside of the contact housing case 102A and the inside of the cap 230 are communicated with each other via the through hole 210a of the upper magnetic yoke 210, as in the first embodiment. have. A gas such as hydrogen gas, nitrogen gas, a mixed gas of hydrogen and nitrogen, air, or SF ₆ is sealed inside the sealed container formed by the contact housing case 102A, the upper magnetic yoke 210, and the cap 230. .
In the electromagnetic contactor 10B of the third embodiment, the pair of external connection terminal portions 114 and 114 are arranged along the X direction. The top plate 302 of the contact storage case 102A has two sides 302a and 302b located on opposite sides in the Y direction. The top panel 302 of the contact storage case 102A has a pair of external connection terminal portions 114 that is larger than the distance (arrangement pitch) between the pair of external connection terminal portions 114 and 114, as in the first embodiment. And a creeping distance extending portion 150 extending the creeping distance between the pair of external connection terminals 114 and 114 is provided. The creeping distance extending portion 150 is formed by the protrusion 151 similar to that of the first embodiment. In the third embodiment, the protrusion 151 is formed integrally with the top plate 302 and is formed of the same insulating material as the top plate 302. Further, the protrusion 151 is formed in a stripe shape, for example.

  Here, in the third embodiment, the creeping distance extending portion 150 is formed by the protrusion 151 made of the same insulating material as that of the top plate portion 302. Therefore, the protrusion between the pair of external connection terminal portions 114 and 114 is provided. The shortest distance along the surface on the outer surface 302x side of the top plate 302 including the surface 151 is the creepage distance. Therefore, the creepage distance between the pair of external connection terminal portions 114 and 114 can be extended by the creepage distance extending portion 150 rather than the distance between the pair of external connection terminal portions 114 and 114. The creepage distance between the pair of external connection terminal portions 114 and 114 can be extended without increasing the distance between the terminal portions 114 and 114.

Further, the creeping distance between the pair of external connection terminal portions 114 and 114 can be changed in accordance with the protrusion amount of the protrusion 151.
From the above, also in the electromagnetic contactor 10B of the third embodiment, the same effect as in the first embodiment can be obtained.
In the third embodiment, the case where the protrusion 151 as the creeping distance extending portion 150 extends over the two sides 302a and 302b located on the opposite sides in the Y direction of the top surface plate portion 302 has been described. However, the protrusions 151 may be arranged such that both ends in the Y direction (longitudinal direction) are located on the inner side of the two sides 302a and 302b located on opposite sides in the Y direction of the top plate 302. However, also in this case, it is preferable that the protrusion 151 extends across the pair of external connection terminal portions 114 and 114.

In the third embodiment, the case where one protrusion 151 is provided as the creeping distance extending portion 150 between the pair of external connection terminal portions 114 and 114 has been described. However, the present invention is limited to this. Instead, two or more protrusions 151 may be provided between the pair of external connection terminal portions 114 and 114.
In the third embodiment, the case where the protrusion 151 as the creeping distance extending portion 150 is formed in a stripe shape has been described. However, the protrusion 151 crosses between the pair of external connection terminal portions 114 and 114 while meandering. You may extend as follows.

Next, a modification of the above-described third embodiment will be described with reference to FIG.
In the present modification of the third embodiment, as shown in FIG. 10, as in the modification of the first embodiment described above, the protrusion 151 as the creeping distance extending portion 150 is formed by the pair of external connection terminal portions 114 and 114. They are individually provided so as to surround each of them. In this modification, the protrusion 151 is formed in an annular shape that continuously extends around the external connection terminal portion 114.
As described above, also in the present modified example in which the protrusion 151 as the creeping distance extending portion 150 is individually provided so as to surround each of the pair of external connection terminal portions 114 and 114, the same as the modified example of the first embodiment described above. The effect is obtained.

In the modification of the above-described third embodiment, the case where the protrusion 151 as the creeping distance extending portion 150 is individually provided so as to surround each of the pair of external connection terminal portions 114 and 114 has been described. The present invention is not limited to this, and any one of the pair of external connection terminal portions 114 and 114 may be surrounded by a protrusion 151 as a creeping distance extending portion 150.
In the above-described third embodiment and its modification, the case where the top plate 302 and the protrusion 151 are integrally formed will be described. However, the present invention is not limited to this, and the top plate 302 and the protrusion 151 are formed. May be formed separately, and then the protrusion 151 may be bonded and fixed to the top plate 302. In this case, the protrusion 151 can be provided on the top plate portion 302 of the existing bowl-shaped body 303.

(Embodiment 4)
In the fourth embodiment, the case where the creeping distance extending portion 150 that extends the creeping distance between the pair of external connection terminal portions 114 and 114 is formed by the groove 152 will be described with reference to FIGS. 11 and 12.
As shown in FIGS. 11 and 12, the electromagnetic contactor 10 </ b> C of the fourth embodiment has substantially the same configuration as that of the third embodiment described above, but the distance between the pair of external connection terminal portions 114 and 114. Further, the configuration of the creeping distance extending portion 150 that extends the creeping distance between the pair of external connection terminal portions 114 and 114 is different.
That is, in the fourth embodiment, the creeping distance extending portion 150 is formed by a groove 152 that is recessed inward from the outer surface 302x of the top plate portion 302. The groove 152 extends over two sides 302a and 302b located on opposite sides of the top plate 302 in the Y direction. Further, the groove 152 is formed in a stripe shape, for example.

Here, in the fourth embodiment, the creeping distance extending portion 150 is formed by the groove 152 recessed inward from the outer surface 302x of the top plate portion 302, and therefore, between the pair of external connection terminal portions 114 and 114. The shortest distance along the surface on the outer surface 302x side of the top plate 302 including the inner surface of the groove 152 is the creepage distance. Therefore, also in the fourth embodiment, the creepage distance between the pair of external connection terminal portions 114 and 114 can be extended by the creepage distance extending portion 150 rather than the distance between the pair of external connection terminal portions 114 and 114. Therefore, the creeping distance between the pair of external connection terminal portions 114 and 114 can be extended without increasing the distance between the pair of external connection terminal portions 114 and 114.
Further, the creeping distance between the pair of external connection terminal portions 114 and 114 can be changed according to the depth of the groove 152.

From the above, also in the electromagnetic contactor 10C of the fourth embodiment, the same effects as those of the first embodiment can be obtained.
In the fourth embodiment, the case where the groove 152 as the creeping distance extending portion 150 extends over the two sides 302a and 302b located on the opposite sides in the Y direction of the top plate portion 302 has been described. However, both ends of the groove 152 in the Y direction (longitudinal direction) may be positioned on the inner side of the two sides 302a and 302b positioned on opposite sides in the Y direction of the top plate 302. However, even in this case, the groove 152 is preferably extended so as to cross between the pair of external connection terminal portions 114 and 114.

In the above-described fourth embodiment, the case where one groove 152 is provided as the creeping distance extending portion 150 between the pair of external connection terminal portions 114 and 114 has been described, but the present invention is limited to this. Instead, two or more grooves 152 may be provided between the pair of external connection terminal portions 114 and 114.
In the above-described fourth embodiment, the case where the groove 152 as the creeping distance extending portion 150 extends over two sides 302a and 302b located on opposite sides in the Y direction of the top surface plate portion 302 is described. The present invention is not limited to this, and as in the modification of the first embodiment described above, at least one of the pair of external connection terminal portions 114 and 114 is a groove 152 as a creeping distance extending portion 150. You may make it surround with. Even in this case, since the groove 152 crosses between the pair of external connection terminal portions 114 and 114, the same effect as in the first embodiment can be obtained.

In the above-described fourth embodiment, the case where the groove 152 as the creeping distance extending portion 150 is formed in a stripe shape has been described. However, the groove 152 crosses between the pair of external connection terminal portions 114 and 114 while meandering. You may extend as follows.
As described above, the electromagnetic contactor according to the present invention has an effect that the insulation property between the pair of terminal portions for external connection can be improved while suppressing the increase in size, and the contact storage case It is useful for the electromagnetic contactor from which the external connection terminal portion of each of the pair of fixed contacts protrudes.

DESCRIPTION OF SYMBOLS 10,10A, 10B, 10C ... Electromagnetic contactor, 100 ... Contact device, 101 ... Contact mechanism, 102, 102A ... Contact storage case, 103 ... Metal square cylinder, 104 ... Flange part, 105 ... Fixed contact support insulation board (Fixed contact support insulating part), 106 ... through hole, 111, 112 ... fixed contact, 113 ... flange part, 114 ... external connection terminal part (support conductor part)
114a ... pin, 115 ... C-shaped main body, 116 ... upper plate portion, 117 ... intermediate plate portion, 118 ... lower plate portion, 118a ... contact portion, 119 ... magnetic plate, 120 ... through hole, 121 ... insulation cover DESCRIPTION OF SYMBOLS 130 ... Movable contact, 130a ... Contact part, 131 ... Connecting shaft, 131a ... Flange part, 132 ... Recess, 133 ... Through-hole, 134 ... Contact spring, 140 ... Insulating cylinder, 141 ... Magnet storage pocket, 143 ... Arc Arc extinguishing permanent magnet, 145, 146 ... arc extinguishing chamber, 149 ... arc 200 ... electromagnet unit, 201 ... magnetic yoke, 202 ... bottom plate part, 203 ... cylindrical auxiliary yoke, 204 ... spool, 205 ... central cylindrical part, 206 ... lower flange part, 207 ... upper flange part, 208 ... exciting coil 210 ... upper magnetic yoke, 210a ... through hole, 214 ... return spring, 215 Movable plunger, 216 ... peripheral flange portion, 220 ... annular permanent magnet, 221 ... through hole,
225 ... auxiliary yoke, 230 ... cap

Claims (7)

A pair of fixed contacts arranged at a predetermined distance;
A pair of external connection terminal portions comprising a part of each of the pair of fixed contacts;
A movable contact disposed to be separable from the pair of fixed contacts;
A contact storage case for storing a contact mechanism composed of the pair of fixed contacts and the movable contact;
The contact storage case has a stationary contact support insulating portion that supports the pair of stationary contacts,
Each of the pair of external connection terminal portions protrudes upward from the outer surface of the stationary contact support insulating portion of the contact storage case,
The pair of creeping distance extending portions that extend the creeping distance between the pair of external connection terminal portions than the distance between the pair of external connection terminal portions is formed on the fixed contact support insulating portion of the contact storage case. An electromagnetic contactor provided so as to cross between the external connection terminal portions. The electromagnetic contactor according to claim 1,
The creeping distance extending portion is formed by a protrusion protruding upward from an outer surface of the stationary contact support insulating portion. The electromagnetic contactor according to claim 2,
The fixed contact support insulating part has two sides located on opposite sides of each other,
The electromagnetic contactor characterized in that the protrusion extends over the two sides of the fixed contact support insulating portion. The electromagnetic contactor according to claim 2,
The electromagnetic contactor, wherein the protrusion is formed so as to surround any one of the pair of external connection terminal portions. The electromagnetic contactor according to claim 1,
The creeping distance extending portion is formed by a groove recessed inward from an outer surface of the fixed contact support insulating portion. The electromagnetic contactor according to claim 5.
The fixed contact support insulating part has two sides located on opposite sides of each other,
The electromagnetic contactor according to claim 1, wherein the groove extends over the two sides of the fixed contact support insulating portion. The electromagnetic contactor according to claim 5.
The magnetic contactor, wherein the groove is formed so as to surround any one of the pair of external connection terminal portions.

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