JP7259670B2 - magnetic contactor - Google Patents

Description

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

2. Description of the Related Art Conventionally, for example, the one disclosed in Patent Document 1 is known as an electromagnetic contactor that opens and closes a current path.
The electromagnetic contactor shown in Patent Document 1 includes a contact mechanism having a pair of fixed contactors and a movable contact that can be brought into contact with and separated from the pair of fixed contactors, and a contact mechanism housing case that houses the contact mechanism. . The contact mechanism housing case includes a metal square cylinder surrounding the contact mechanism, and a ceramic insulating substrate closing the upper end of the square cylinder. The open lower end of the rectangular cylinder is joined to the iron magnetic yoke of the electromagnet unit that drives the contact mechanism. The magnetic yoke has a through hole through which the movable plunger of the electromagnet unit is inserted, and the inside of the contact mechanism housing case and the lower side of the magnetic yoke communicate through the through hole. The upper end of a bottomed cylindrical metal cap that accommodates the movable plunger is joined to the lower surface of the magnetic yoke. The magnetic yoke and the cap form a closing metal member that closes the open end of the contact mechanism housing case. The contact mechanism housing case and the closing metal member constitute a sealed container. It contains gas.

In addition, an insulating cylindrical portion formed in the shape of a bottomed rectangular tube is arranged on the inner peripheral surface of the rectangular tube of the contact mechanism housing case. This insulating tube is formed by molding an insulating synthetic resin, and has an insulating function of blocking the influence of an arc on the metallic rectangular tube.
As described above, in the electromagnetic contactor shown in Patent Document 1, the sealing property of the enclosed gas is achieved by the contact mechanism housing case and the closing metal member that closes the open end of the contact mechanism housing case. It is held in a sealed container configured. In addition, the insulating cylinder portion disposed on the inner peripheral surface of the square cylinder of the contact mechanism housing case has an insulating function of blocking the influence of the arc on the metallic square cylinder.

JP 2016-12504 A

However, the electromagnetic contactor disclosed in Patent Document 1 has the following problems.
That is, a sealed container comprising a contact mechanism housing case having a gas-sealing property for an insulating cylinder portion having an insulating function of blocking the influence of an arc on a metal rectangular cylinder and a closing metal member. Since it is configured as a separate body, there is a problem that the number of parts increases and the manufacturing cost of the electromagnetic contactor becomes expensive.
In addition, the arc generated when the current path is interrupted leaks from the gap formed between the insulating cylinder, the metal square cylinder and the ceramic insulating substrate that constitute the contact mechanism housing case, and the arc is reliably cut off. However, there is a problem that a short circuit may occur through the metal square cylinder because the current cannot be properly cut off.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve these conventional problems. To provide an electromagnetic contactor which can be reduced in cost, and which can reliably cut off an arc.

In order to achieve the above object, an electromagnetic contactor according to an aspect of the present invention includes a contact mechanism having a pair of fixed contacts and a movable contact that can be brought into contact with and separated from the pair of fixed contacts, and the contact mechanism. a contact mechanism housing case having an open end; and a closing metal member for closing the open end of the contact mechanism housing case. An electromagnetic contactor constituting a sealed container in which gas is enclosed, wherein the contact mechanism housing case is formed in a cylindrical shape with a bottom and is made of a metal housing case body having one end as the open end, and the housing case The gist is that the main body is integrally formed with an insulating member that covers the periphery of the main body.

According to the magnetic contactor according to the present invention, the number of parts of the member having the insulation function to cut off the influence of the arc and the gas sealing property of the enclosed gas is reduced to reduce the cost, and the arc is reliably cut off. It is possible to provide an electromagnetic contactor that can

1 is a perspective view of an electromagnetic contactor according to one embodiment of the present invention; FIG. FIG. 2 is a plan view of the electromagnetic contactor shown in FIG. 1; FIG. 2 is a front view of the electromagnetic contactor shown in FIG. 1; FIG. 2 is a right side view of the electromagnetic contactor shown in FIG. 1; FIG. 3 is a cross-sectional view taken along line 5-5 in FIG. 2; It is a sectional view showing an electromagnetic contactor concerning a reference example.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The embodiments shown below exemplify apparatuses and methods for embodying the technical idea of the present invention. It is not intended to be specific to the following embodiments. Also, the drawings are schematic. Therefore, it should be noted that the relationship, ratio, etc. between the thickness and the planar dimensions are different from the actual ones, and the drawings include portions where the relationship and ratio of the dimensions are different from each other.
1 to 5 show an electromagnetic contactor according to one embodiment of the present invention. The electromagnetic contactor 1 includes a contact mechanism 2, an electromagnet unit 3 for driving the contact mechanism 2, and a contact mechanism 2 and a contact mechanism housing case 4 having an open end. Hereinafter, the directions "up", "down", "left", "right", "front", and "back" are used as appropriate, and these directions are shown in FIGS. Follow directions.

First, the contact mechanism housing case 4 is formed in the shape of a square tube with a bottom, and includes a metallic housing case body 5 having an open bottom end, and an insulating member covering the periphery including the inner surface 5f and the outer surface 5g of the housing case body 5. 6 are integrally formed. The storage case main body 5 is formed by deep drawing a metal flat plate, and includes a rectangular bottom portion 5a and a peripheral wall portion 5b extending downward from each side of the bottom portion 5a so as to surround the periphery of the bottom portion 5a. and The housing case main body 5 is preferably made of aluminum in consideration of deep drawing workability and gas-tightness of enclosed gas, which will be described later. A horizontally protruding flange portion 5c is formed by bending the lower end of the peripheral wall portion 5b of the storage case main body 5. As shown in FIG. The contact mechanism accommodation case 4 is accommodated by injecting an insulating synthetic resin, which becomes the insulating member 6, into the surroundings including the inner surface 5f and the outer surface 5g of the accommodation case main body 5 in a state where the accommodation case main body 5 is inserted into the mold. It is formed by a molding method for integrating the case body 5 and the insulating member 6, that is, so-called insert molding. A pair of fixed contact inserts into which a fixed conductor portion 21a of a first fixed contact 21 and a fixed conductor portion 22a of a second fixed contact 22, which will be described later, are respectively inserted are inserted into the bottom portion 5a of the housing case main body 5. Common holes 5d and 5e are formed. In addition, the inner peripheral surfaces of the fixed contact insertion holes 5d and 5e in the bottom portion 5a of the housing case body 5 are covered with an insulating member 6, and the fixed contact insertion holes 5d and 5e on the surface (upper surface) of the bottom portion 5a of the housing case body 5 are covered. The peripheries of the common holes 5d and 5e are exposed to form exposed surfaces 5da and 5ea. On the other hand, the flange portion 5c formed at the lower end of the peripheral wall portion 5b of the housing case main body 5 is sealingly joined to the upper surface of the magnetic yoke plate 8 constituting the closing metal member 10, which will be described later.

The contact mechanism 2 includes a first fixed contact 21 and a second fixed contact 22 fixed to the bottom portion of the contact mechanism housing case 4 (the portion corresponding to the bottom portion 5a of the housing case main body 5), and these second fixed contacts 21 and 22. A movable contact 23 is arranged so as to be able to come into contact with and separate from the first fixed contact 21 and the second fixed contact 22 . Each of the first fixed contact 21 and the second fixed contact 22 includes cylindrical fixed conductor portions 21a and 22a and collar portions 21b and 22b that horizontally protrude from the upper ends of the fixed conductor portions 21a and 22a. there is Each of the first fixed contact 21 and the second fixed contact 22 is made of a conductive metal member.

Here, when fixing the first fixed contactor 21 and the second fixed contactor 22 to the bottom portion of the contact mechanism housing case 4, ceramics are applied to the exposed surfaces 5da and 5ea of the bottom portion 5a of the housing case body 5, respectively. The annular flat plate members 11a and 11b made from the same material are joined by adhesion. Then, the fixed conductor portions 21a and 22a of the first fixed contact 21 and the second fixed contact 22 are inserted through the fixed contact insertion holes 5d and 5e via the annular flat plate members 11a and 11b, respectively, and the collar portion 21b is , 22b are bonded to the surfaces of the annular flat plate members 11a, 11b. Thereby, each of the first fixed contact 21 and the second fixed contact 22 is fixed to the bottom portion of the contact mechanism housing case 4 .
The movable contact 23 is a conductive metal member, is a flat plate elongated in the horizontal direction, and is arranged below the first fixed contact 21 and the second fixed contact 22 . The movable contactor 23 is supported by a connecting member 37 fixed to a movable plunger 31 (described later) of the electromagnet unit 3 .

The connecting member 37 is formed in a substantially cylindrical shape by molding an insulating synthetic resin, and has a movable contact insertion hole 37a penetrating in the left-right direction at substantially the center in the vertical direction. The movable contact 23 is arranged so as to protrude in the left-right direction into the movable contact insertion hole 37a. In the movable contact insertion hole 37a below the movable contact 23, the upper end is in contact with the movable contact 23 and the lower end is in contact with the lower surface of the movable contact insertion hole 37a. A contact spring 39 is arranged to bias upward. The movable contact 23 is placed in contact with the upper surface of the movable contact insertion hole 37 a by the biasing force of the contact spring 39 . In addition, in the concave portion 37b formed on the upper surface of the connecting member 37, the upper end abuts the bottom portion of the contact mechanism housing case 4 and the lower end abuts the bottom surface of the concave portion 37b so that the connecting member 37 is always attached downward. A biasing return spring 38 is provided.

In the released state, the movable contact 23 is separated from the lower surface of the fixed conductor portion 21a of the first fixed contact 21 and the lower surface of the fixed conductor portion 22a of the second fixed contact 22 with a predetermined gap. Further, the movable contact 23 is applied to the lower surface of the fixed conductor portion 21a of the first fixed contact 21 and the lower surface of the fixed conductor portion 22a of the second fixed contact 22 with a predetermined contact force by the contact spring 39 at the closing position. configured to make contact.

Further, inside the contact mechanism housing case 4 and above the magnetic yoke plate 8, as shown in FIG. The insulating tubular portion 7 includes a bottom plate portion 7a and a tubular portion 7b projecting upward from the central portion of the bottom plate portion 7a. An insertion hole 7c for a connecting member 37 is formed in the center of the cylindrical portion 7b so as to penetrate vertically. The insulating cylindrical portion 7 is formed by molding an insulating material such as a synthetic resin.
The electromagnet unit 3 includes a closing metal member 10 for closing the open end of the contact mechanism housing case 4, a movable plunger 31, an armature 32, a fixed plunger 33, an exciting coil 34, a spool 35, and a magnetic yoke 36. It is arranged below the mechanism 2 .

The closing metal member 10 has a magnetic yoke plate 8 and a cap 9 .
The magnetic yoke plate 8 is composed of a substantially rectangular plate made of iron, and magnetic flux flows together with the magnetic yoke 36 when the exciting coil 34 is excited. The upper surface of the magnetic yoke plate 8 is sealingly joined to the flange portion 5c formed at the lower end of the peripheral wall portion 5b of the housing case body 5, as described above. In the central portion of the magnetic yoke plate 8, a connecting member insertion hole 8a is formed through which the connecting member 37 can be inserted. Through the connecting member insertion hole 8a, the inside of the contact mechanism housing case 4 and the lower side of the magnetic yoke plate 8 communicate with each other, and the inside of the contact mechanism housing case 4 does not have a sealed structure.

On the other hand, the cap 9 is a two-stage cylindrical metal member having a small diameter portion that accommodates the movable plunger 31 and a large diameter portion that accommodates the armature 32 . It is seal bonded to the bottom surface. By joining the open upper end of the cap 9 to the lower surface of the magnetic yoke plate 8, the connecting member insertion hole 8a is closed. Since the cap 9 is formed by deep drawing, it is preferably made of aluminum.
As a result, the open end of the contact mechanism housing case 4 is closed with the closing metal member 10, and the contact mechanism housing case 4 and the closing metal member 10 form a sealed container. A gas such as hydrogen gas, nitrogen gas, mixed gas of hydrogen and nitrogen, air, SF6, etc., for arc interruption is enclosed in the sealed container. The gas-tightness of the gas enclosed in the sealed container is ensured by the metal containing case body 5 and the closing metal member 10 that constitute the contact mechanism containing case 4 .

The movable plunger 31 is composed of a cylindrical iron core, and has an upper shaft portion 31a at the center of its upper surface. The upper shaft portion 31 a of the movable plunger 31 is fixed to the lower end portion of the connecting member 37 .
The armature 32 is a substantially rectangular iron core flat plate extending in the left-right direction and the front-rear direction and having a predetermined plate thickness, and is attached to the upper shaft portion 31 a of the movable plunger 31 .
The movable plunger 31 and armature 32 are housed within the cap 9 as described above.

The fixed plunger 33 is a fixed iron core formed in an annular shape, and as shown in FIG.
The exciting coil 34 is excited to generate a magnetic force to drive the movable plunger 31, and an insulating spool 35 arranged to cover the movable plunger 31 and the fixed plunger 33 in the circumferential direction. wrapped around it.
Further, the magnetic yoke 36 houses therein the movable plunger 31 and the armature 32 housed in the cap 9, the fixed plunger 33, the spool 35 and the excitation coil 34. As shown in FIG. As shown in FIGS. 3 and 5, the magnetic yoke 36 is constructed by combining a pair of left magnetic yoke half 36a and right magnetic yoke half 36b each made of an iron plate having a C-shaped side cross section. The upper surface of the magnetic yoke 36 is joined to the lower surface of the magnetic yoke plate 8 so that magnetic flux flows together with the magnetic yoke plate 8 when the exciting coil 34 is excited.

In the electromagnetic contactor 1 configured as described above, when the excitation coil 34 is in the non-excited state, the movable plunger 31 is always urged downward via the connecting member 37 by the elastic force of the return spring 38. As shown in FIG. 5, the armature 32 attached to the upper shaft portion 31a of the movable plunger 31 is positioned above the stepped portion of the cap 9 at a predetermined distance below the magnetic yoke plate 8. are doing.
When the excitation coil 34 is energized and excited, a magnetic flux is generated that flows in the direction in which the armature 32 is attracted to the magnetic yoke plate 8, and the magnetic force causes the movable plunger 31 to resist the elastic force of the return spring 38, thereby causing the above-mentioned movement. , and the armature 32 contacts the lower surface of the magnetic yoke plate 8 .

Further, when the excitation coil 34 is released from the excited state, the movable plunger 31 is always urged downward through the connecting member 37 by the elastic force of the return spring 38, so that the upper shaft of the movable plunger 31 descends. The armature 32 attached to the portion 31a returns to the position above the stepped portion of the cap 9 at a position spaced downward from the magnetic yoke plate 8 by a predetermined distance.
As shown in FIG. 2, two pairs of arc-extinguishing permanent magnets 41a and 41b are arranged on both outer sides of the contact mechanism housing case 4 in the front-rear direction.

Next, the operation of the electromagnetic contactor 1 will be described.
Assume now that the first stationary contact 21 is connected to, for example, a power supply source that supplies a large current, and the second stationary contact 22 is connected to a load device.
In this state, it is assumed that the exciting coil 34 in the electromagnet unit 3 is in a non-excited state and is in a released state in which no magnetic force is generated to move the movable plunger 31 upward.
In this released state, as described above, the movable plunger 31 is always urged downward by the elastic force of the return spring 38. Therefore, as shown in FIG. The armature 32 is positioned above the stepped portion of the cap 9 at a position spaced downward from the lower surface of the magnetic yoke plate 8 by a predetermined distance.

Therefore, the movable contact 23 connected to the movable plunger 31 via the connecting member 37 is the lower surface of the fixed conductor portion 21a of the first fixed contact 21 and the lower surface of the fixed conductor portion 22a of the second fixed contact 22. are spaced downward at a predetermined interval. Therefore, the current path between the first fixed contact 21 and the second fixed contact 22 is cut off, and the contact mechanism 2 is opened.
From this open state, the excitation coil 34 of the electromagnet unit 3 is energized to excite the excitation coil 34 . Then, as described above, a magnetic flux is generated that flows in the direction in which the armature 32 is attracted to the magnetic yoke plate 8, and the magnetic force causes the movable plunger 31 to rise from the above-described distant position against the elastic force of the return spring 38. , the armature 32 contacts the lower surface of the magnetic yoke plate 8 .

As the movable plunger 31 rises in this way, the movable contactor 23 connected to the movable plunger 31 via the connecting member 37 also rises, and the movable contactor 23 moves toward the fixed conductor of the first fixed contactor 21. The lower surface of the portion 21 a and the lower surface of the fixed conductor portion 22 a of the second fixed contact 22 are brought into contact with a predetermined contact force by the contact spring 39 .
Therefore, a large current from the power supply source is supplied to the load device through the first fixed contact 21, the movable contact 23, and the second fixed contact 22, resulting in a closed state.

When the current supply to the load device is interrupted from the closed state of the contact mechanism 2, the energization to the exciting coil 34 of the electromagnet unit 3 is stopped. When the energization of the exciting coil 34 is stopped, the exciting state of the exciting coil 34 is released, and the magnetic force for moving the movable plunger 31 upward disappears. Since the movable plunger 31 is always biased downward by the elastic force of the return spring 38, it descends. Then, the armature 32 attached to the upper shaft portion 31a of the movable plunger 31 returns to a position above the stepped portion of the cap 9 at a predetermined distance downward from the lower surface of the magnetic yoke plate 8. .

As the movable plunger 31 descends, the connecting member 37 descends. When contact pressure is applied by the contact spring 39 accordingly, the movable contact 23 moves the lower surface of the fixed conductor portion 21 a of the first fixed contact 21 and the lower surface of the fixed conductor portion 22 a of the second fixed contact 22 . are in contact with each of the After that, when the contact pressure of the contact spring 40 disappears, the movable contactor 23 is separated downward from the first stationary contactor 21 and the second stationary contactor 22, thereby entering an opening start state.
In such an opening start state, an arc is generated between the movable contactor 23 and the first stationary contactor 21 and the second stationary contactor 22, and the arc continues the conducting state of current. Become.

These arcs are generated by Fleming's theory from the relationship between the current flow of these arcs and the magnetic fluxes generated by the two pairs of arc-extinguishing permanent magnets 41a and 41b arranged on both outer sides of the contact mechanism housing case 4 in the front-rear direction. The arc is elongated and extinguished by the Lorentz force generated by the left-hand rule.
Here, the extended arc is interrupted by the insulating function of the insulating member 6 covering the inside of the housing case body 5 in the contact mechanism housing case 4, and the arc short-circuits through the metal housing case body 5. No fear.
Then, when the release operation of the movable plunger 31 is completed, the contact opening is completed.

Next, the effect of the magnetic contactor 1 according to this embodiment will be described in comparison with the magnetic contactor 101 according to the reference example shown in FIG.
An electromagnetic contactor 101 shown in FIG. 6 according to a reference example includes a contact mechanism 102, an electromagnet unit 103 that drives the contact mechanism 102, and a contact mechanism housing case 104 that houses the contact mechanism 102 and has an open end. there is
The contact mechanism 102 is housed in a contact mechanism housing case 104. The contact mechanism housing case 104 comprises a metal rectangular cylinder 105 and a plate-like ceramic plate closing the upper end of the rectangular cylinder 105. and an insulating substrate 106 . A flange portion protruding outward in the horizontal direction is bent at the lower end portion forming the open end of the rectangular tube 105 . This flange portion is seal-bonded to the upper surface of a magnetic yoke plate 108, which will be described later.

The contact mechanism 102 includes a pair of stationary contacts 121 and 122 (hereinafter referred to as a first stationary contact 121 and a second stationary contact 122) fixed to the insulating substrate 106 via a pair of conductor portions 123 and 124. ), and a movable contact 125 arranged to be able to contact and separate from the first fixed contact 121 and the second fixed contact 122 . The movable contactor 125 is vertically movably supported by a connecting shaft 136 fixed to a movable plunger 131, which will be described later. In FIG. 6, reference numeral 138 is a contact spring.
In addition, an insulating cylindrical portion 107 formed in the shape of a bottomed rectangular tube is arranged on the inner peripheral surface of the rectangular tube 105 of the contact mechanism housing case 104 . The insulating tube portion 107 is formed by molding an insulating material such as a synthetic resin, and has an insulating function of blocking the influence of the arc on the metallic rectangular tube 105 .

On the other hand, the electromagnet unit 103 includes a closing metal member 110 for closing the open end of the contact mechanism housing case 104, a movable plunger 131, a fixed plunger 132, an exciting coil 133, a spool 134, a magnetic yoke 135, and a return spring 137. there is
Here, the closing metal member 110 has a magnetic yoke plate 108 and a cap 109 .
The magnetic yoke plate 108 is composed of a substantially rectangular flat plate made of iron, and the upper surface of the magnetic yoke plate 108 is seal-bonded to the flange formed at the lower end of the rectangular tube 105 as described above. In the central portion of the magnetic yoke plate 108, a movable plunger insertion hole 108a is formed through which the cylindrical portion of the movable plunger 131 can be inserted. Through this movable plunger insertion hole 108a, the inside of the contact mechanism housing case 104 and the lower side of the magnetic yoke plate 108 communicate with each other, and the inside of the contact mechanism housing case 104 does not have a sealed structure.

On the other hand, the cap 109 is a metal member such as an aluminum member that accommodates the cylindrical portion of the movable plunger 131 , and its upper end is sealingly joined to the lower surface of the magnetic yoke plate 108 . By joining the upper end of the cap 109 to the lower surface of the magnetic yoke plate 108, the contact mechanism housing case 104 and the inside of the cap 109 are sealed from the outside while communicating with each other through the movable plunger insertion hole 108a.
As a result, the open end of the contact mechanism housing case 104 is closed with the closing metal member 110, and the contact mechanism housing case 104 and the closing metal member 110 form a sealed container. A gas such as hydrogen gas, nitrogen gas, mixed gas of hydrogen and nitrogen, air, SF6, etc., for arc interruption is enclosed in the sealed container. The gas-tightness of the gas enclosed in the hermetically sealed container is ensured by the metal square cylinder 105 and the ceramic insulating substrate 106 that constitute the contact mechanism housing case 104 and the closing metal member 110 .

The movable plunger 131 is composed of an iron core having a cylindrical portion with a peripheral flange at the upper end, and is fixed to a connecting shaft 136 that supports the movable contactor 125 .
Also, the fixed plunger 132 is a cylindrical fixed iron core arranged below the movable plunger 131 .
Furthermore, the excitation coil 133 is wound around a spool 134 arranged to surround the fixed plunger 132 .
A return spring 137 is arranged between the bottom portion of the cap 109 and the cylindrical portion of the movable plunger 131 to always urge the movable plunger 131 upward.

The magnetic yoke 135 is composed of an iron core with an open upper end that accommodates the cylindrical portion of the movable plunger 131, the fixed plunger 132, the excitation coil 133, the spool 134, and the return spring 137 inside. A magnetic yoke plate 108 is attached to the open upper end of the magnetic yoke 135 .
In the case of the magnetic contactor 101 according to the reference example configured in this way, the insulating cylindrical portion 107 having an insulating function of blocking the influence of the arc on the metal rectangular cylindrical body 105 is provided to seal the enclosed gas. and a sealed container made up of the contact mechanism housing case 104 and the metal member 110 for closure. Therefore, the number of parts increases, and the manufacturing cost of the electromagnetic contactor 1 becomes expensive.

On the other hand, in the case of the electromagnetic contactor 1 according to the present embodiment, the insulating member 6 having an insulating function of blocking the influence of the arc on the metallic housing case body 5 is integrally formed with the housing case body 5 to form the contact. It constitutes a mechanism housing case 4 . The insulating member 6 is not formed separately from the sealed container composed of the housing case main body 5 of the contact mechanism housing case 4 having gas-sealing properties and the closing metal member 10 . For this reason, the electromagnetic contactor 1 can be manufactured at a low cost by reducing the number of parts of the member having the insulating function of interrupting the arc and sealing of the enclosed gas.

Further, in the case of the electromagnetic contactor 101 according to the reference example, from the gap formed between the insulating cylindrical portion 107 and the metal rectangular cylindrical body 105 and the ceramic insulating substrate 106 that constitute the contact mechanism housing case 104, , the arc generated when the current path is interrupted leaks, and there is a possibility that the arc cannot be interrupted and a short circuit occurs through the metallic rectangular tube 105 .
On the other hand, in the case of the electromagnetic contactor 1 according to the present embodiment, the contact mechanism housing case 4 is formed in a cylindrical shape with a bottom and is made of a metallic housing case body 5 with an open end, and a housing case body 5 and an insulating member 6 that covers the periphery of the member 5 are integrally formed. Therefore, there is no gap between the metal containing case main body 5 and the insulating member 6 covering the periphery of the containing case main body 5, and the metal containing case main body 5 is exposed inside the contact mechanism containing case 4. Therefore, the arc does not short-circuit through the housing case main body 5, and the arc to the housing case main body 5 can be reliably interrupted.

Further, in the case of the electromagnetic contactor 1 according to the present embodiment, when fixing each of the first fixed contact 21 and the second fixed contact 22 to the bottom portion of the contact mechanism housing case 4, the bottom portion of the housing case main body 5 Annular flat plate members 11a and 11b made of ceramics are bonded to exposed surfaces 5da and 5ea of 5a, respectively. Then, the fixed conductor portions 21a and 22a of the first fixed contact 21 and the second fixed contact 22 are inserted through the fixed contact insertion holes 5d and 5e via the annular flat plate members 11a and 11b, respectively, and the collar portion 21b is , 22b are bonded to the surfaces of the annular flat plate members 11a, 11b. Therefore, the possibility that the first fixed contactor 21 and the second fixed contactor 22 are short-circuited by the housing case body 5 made of metal can be reliably avoided by the annular flat plate members 11a and 11b made of ceramics. In addition, since the annular flat plate members 11a and 11b made of ceramics have excellent gas sealing properties, the annular flat plate members 11a and 11b avoid the risk of gas leaking out from the fixed contact insertion holes 5d and 5e. be able to. Further, since the annular flat plate members 11a and 11b made of ceramics are excellent in heat resistance, there is no problem even if the housing case main body 5 and the first fixed contactor 21 and the second fixed contactor 22 are heated to a high temperature.

Further, in the case of the electromagnetic contactor 101 according to the reference example, the upper end, which is the open end of the metal rectangular tube 105, is made of ceramics in order to secure the gas sealing property of the gas enclosed in the contact mechanism housing case 104. It is closed by an insulating substrate 106 .
On the other hand, in the case of the electromagnetic contactor 1 according to the present embodiment, in order to secure the gas sealing property of the gas enclosed in the contact mechanism housing case 4, the metal contactor 1 formed in a bottomed rectangular tube shape is used. A housing case main body 5 is used. For this reason, in the electromagnetic contactor 1 according to the present embodiment, unlike the electromagnetic contactor 101 according to the reference example, the insulating substrate 106 made of ceramics is not required, and the metal plate is deep-drawn to form the storage case main body. 5 need only be formed.

Although the embodiment of the present invention has been described above, the present invention is not limited to this and can be modified and improved in various ways.
For example, the contact mechanism housing case 4 is insulated from the housing case body 5 by injecting an insulating synthetic resin that will be the insulating member 6 around the housing case body 5 while the housing case body 5 is inserted into a mold. Although it is formed by a molding method for integrating with the member 6, so-called insert molding, it is not necessarily required to be formed by insert molding as long as the method is capable of integrally forming the housing case main body 5 and the insulating member 6. do not have. For example, an insulating resin may be powder-coated on the housing case main body 5 made of metal.

Further, the storage case main body 5 may be made of a metal other than aluminum as long as it is made of a metal that is excellent in deep drawing workability and gas sealing properties. However, in the case of aluminum, it is extremely excellent in deep drawing workability and gas sealability, and is very suitable as a material for the housing case main body 5 .
Further, when fixing the first fixed contact 21 and the second fixed contact 22 to the bottom portion of the contact mechanism housing case 4, it is not always necessary to use the annular plate members 11a and 11b made of ceramics.

The closing metal member 10 may be any metal member that closes the open end of the contact mechanism housing case 4, and includes an iron magnetic yoke plate 8 to which the open end of the housing case main body 5 is joined, and a magnetic yoke plate 8. It is not always necessary to configure a metal cap 9 whose open end is joined to the magnetic yoke plate 8 so as to close the connecting member insertion hole 8a formed in the .
Further, the shapes of the first fixed contact 21, the second fixed contact 22 and the movable contact 23 that constitute the contact mechanism 2 are not limited to the example shown in FIG.

1 electromagnetic contactor 2 contact mechanism 3 electromagnet unit 4 contact mechanism housing case 5 housing case main body 5a bottom portion 5b peripheral wall portion 5c flange portion 5d fixed contact insertion hole 5da exposed surface 5e fixed contact insertion hole 5ea exposed surface 5f inner surface 5g Outer surface 6 Insulating member 7 Insulating cylindrical portion 7a Bottom plate portion 7b Cylinder portion 7c Insertion hole 8 Magnetic yoke plate 9 Cap 10 Closing metal member 11a, 11b Annular flat plate member 21 First fixed contact (fixed contact)
21a fixed conductor portion 21b collar portion 22 second fixed contact (fixed contact)
22a fixed conductor 22b flange 23 movable contact 31 movable plunger 32 armature 33 fixed plunger 34 excitation coil 35 spool 36 magnetic yoke 36a left magnetic yoke half 36b right magnetic yoke half 37 connecting member 37a movable contact insertion hole 37b recess 38 return spring 39 contact spring 41a, 41b arc extinguishing permanent magnet

Claims (4)

A contact mechanism having a pair of fixed contacts and a movable contact that can be brought into contact with and separated from the pair of fixed contacts, a contact mechanism housing case containing the contact mechanisms and having an open end, and opening of the contact mechanism housing case An electromagnetic contactor comprising a closing metal member for closing an end thereof, wherein the contact mechanism housing case and the closing metal member constitute a sealed container in which an arc interruption gas is enclosed,
The contact mechanism housing case is formed in a cylindrical shape with a bottom, and covers a metal housing case main body with one end as the open end, and the surroundings including the inner and outer surfaces of the housing case main body to cut off the arc. and an insulating member having an insulating function to prevent an arc from being short-circuited through the containing case main body . 2. The electromagnetic contactor according to claim 1, wherein said housing case body is made of aluminum. A fixed contact insertion hole through which the fixed conductor portion of the fixed contact is inserted is formed in the bottom portion of the housing case main body, and an inner peripheral surface of the fixed contact insertion hole in the bottom portion of the housing case main body. is covered with the insulating member, and the periphery of the fixed contact insertion hole on the surface of the bottom portion of the housing case body forms an exposed exposed surface,
An annular flat plate member made of ceramics is joined to the exposed surface of the bottom portion of the housing case main body, and the fixed conductor portion of the fixed contact is inserted through the fixed contact insertion hole via the annular flat plate member. 3. The electromagnetic contactor according to claim 1, wherein a flange portion protruding in the circumferential direction from the fixed conductor portion is joined to the annular flat plate member. The closing metal member is an iron magnetic yoke having a connecting member insertion hole extending vertically through which a connecting member connecting the movable plunger and the movable contact can be inserted, to which the open end of the housing case body is joined. and a metal cap which accommodates the movable plunger and whose open end is joined to the magnetic yoke plate so as to block the connecting member insertion hole. 4. The electromagnetic contactor according to any one of 3.

Images