KR20140066060A - Electromagnetic contactor with sealing member capable of opening and shutting - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic contactor having an openable and closable sealing member, more particularly, to an electric contactor which is filled with an insulating gas and is easily sealed, and a sealing member can be opened by adjusting a temperature condition, To an electromagnetic contactor provided with a sealable member.
An electromagnetic contactor provided with an openable and closable sealing member according to an embodiment of the present invention includes a stationary contactor, a movable contactor which contacts or separates from the stationary contactor, and an actuator that drives the movable contactor to contact or separate the stationary contactor 1. An electromagnetic contactor comprising: a housing having a lower surface thereof opened, an upper surface thereof fitted with the stationary contactor, and a movable contactor inserted therein; A plate having a center hollow portion and spaced apart from a lower portion of the housing; A coupling member coupled between the housing and the plate; And a cylinder coupled to a lower portion of the plate, wherein an airtight space is formed to surround the housing, the connecting body, the plate, and the cylinder, and a portion of the cylinder, An opening hole is formed, and a sealing member capable of opening and closing is inserted into the opening hole.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic contactor with a sealing member capable of opening and closing,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic contactor having an openable and closable sealing member, more particularly, to an electric contactor which is filled with an insulating gas and is easily sealed, and a sealing member can be opened by adjusting a temperature condition, To an electromagnetic contactor provided with a sealable member.

Electromagnetic contactor is a type of electric circuit switching device that transmits the mechanical signal and current signal by using the principle of electromagnet. It is installed in various industrial facilities, machinery, and vehicles.

Fig. 1 is a perspective view of a conventional electromagnetic contactor, and Fig. 2 is a cross-sectional view taken along a line A-A of Fig. 1. Fig.

Such an electromagnetic contactor includes a case 1, a housing 2, a fixed contact 3 and a movable contact 4. The movable contact 4 is driven so as to be able to control the opening / And an electric actuator.

The fixed contact 3 is connected to the load, and the movable contact 4 serves as a switch which contacts and separates from the fixed contact 3. The housing 2 is a frame for fixing the stationary contact 3 and the case 1 accommodates the housing 2, the stationary contact 3, the movable contact 4 and the electric actuator.

The electric actuator includes an armature (6), a mover (7), and a return spring (8). The armature 6 generates a magnetic force when the power is applied, and the mover 7 is moved by the magnetic force of the armature 6 when the armature is powered on. The return spring 8 provides an elastic force that allows the mover 7 to return to the initial position when the armature 6 is powered off. In this electric actuator, the shaft 5 connected to the movable contact 4 is fixed to the movable member 7 to move the movable contact 4 up and down.

A contact spring 9 is provided between the movable contact 4 and the shaft 5 to bring the movable contact 4 into close contact with the fixed contact 3 in a contact state.

Particularly, in the case of the electromagnetic contactor used in the electric automobile, the movable contact 4 must be stably connected to the fixed contact 3, and if the movable contact 4 inadvertently deviates from the fixed contact 3 under an unspecified circumstance An arc may be generated to cause damage or malfunction of internal parts. In order to extinguish the arc generated, the peripheral portion where the contact is formed is kept air-tight and filled with insulating gas such as hydrogen (H ₂ ) or nitrogen (N ₂ ).

3 shows a sealing method according to the prior art. Conventionally, insulative gas is injected into an injection port formed in a part of an airtight space including a fixed contact and a movable contact, and a copper rod is inserted to seal the opening, and then the rear end is cut and pressed. The copper bar used in this way is not economical due to its high unit price, and can not be easily handled when the internal parts are broken after sealing or when gas needs to be refilled for other reasons.

On the other hand, Korean Patent No. 10-1190854 discloses a method of manufacturing a sealing contact. Here, the chamber 400 is installed under the plate 405, and then the insulating gas is injected into the chamber 400 and the cylinder 440 is laser-welded to the lower part of the plate 405. However, this method inconvenience and waste such as the necessity of utilizing the chamber 400 and inserting the insulating gas into the chamber 400 all together. Also, it is impossible to easily cope with the case where the internal parts are broken or the gas needs to be recharged for other reasons after sealing.

If the inside is dismantled to repair a long-term use or a failure of a component even after the sealing, the sealing portion must be opened, the insulation gas must be filled again, and the seal must be re-sealed. For this to be possible, the sealing member must be able to be opened and closed.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and its object is to fill an airtight space including a stationary contact and a movable contact with an insulating gas and to facilitate sealing thereof, An object of the present invention is to provide an electromagnetic contactor provided with a sealable sealing member.

An electromagnetic contactor provided with an openable and closable sealing member according to an embodiment of the present invention includes a stationary contactor, a movable contactor which contacts or separates from the stationary contactor, and an actuator that drives the movable contactor to contact or separate the stationary contactor 1. An electromagnetic contactor comprising: a housing having a lower surface thereof opened, an upper surface thereof fitted with the stationary contactor, and a movable contactor inserted therein; A plate having a center hollow portion and spaced apart from a lower portion of the housing; A coupling member coupled between the housing and the plate; And a cylinder coupled to a lower portion of the plate, wherein an airtight space is formed to surround the housing, the connecting body, the plate, and the cylinder, and a portion of the cylinder, An opening hole is formed, and a sealing member capable of opening and closing is inserted into the opening hole.

Here, the sealing member is formed of a shape memory alloy material, and the sealing member expands at a temperature above the first temperature to compress and seal the opening hole.

Further, the sealing member is formed of a shape memory alloy material, and the sealing member can be reduced and separated from the opening hole at a temperature lower than the second temperature.

In the above-described example, the sealing member may be covered with an O-ring.

According to the electromagnetic contactor provided with the sealing member capable of opening and closing according to an embodiment of the present invention, it is easy to seal the gas-tight space after the gas is filled in the gas-tight space including the stationary contact and the movable contact, When the inside is disassembled to repair a breakdown or the like of the parts, the sealing member is removed to recharge the insulating gas, and the sealing member can be re-joined again, which makes it possible to repair and recycle.

1 is a perspective view of an electromagnetic contactor according to the prior art.
2 is a cross-sectional view of a conventional electromagnetic contactor.
3 is a perspective view showing a hermetically sealed space sealing method of an electromagnetic contactor according to the related art.
4 is a sectional view of a main part of an electromagnetic contactor according to an embodiment of the present invention.
5 is a sectional view of the airtight space portion of the electromagnetic contactor according to the embodiment of the present invention.
6 is a perspective view of the lower part of the cylinder and the sealing member of the electromagnetic contactor according to the embodiment of the present invention.
7 is a shrinkage and extension state view of a sealing member according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, which are intended to illustrate the present invention in a manner that allows a person skilled in the art to easily carry out the invention. And does not mean that the technical idea and scope of the invention are limited.

The electromagnetic contactor according to an embodiment of the present invention includes a housing 30 having a bottom open and a fixed contact 10 on an upper surface thereof and having a movable contact 20 inserted therein, A supporting body 50 for supporting a driving shaft 40 connected to the movable contact 20 and coupled to a lower portion of the lower housing 35, a lower housing 35 coupled to a lower portion of the supporting body 50, A connection member 65 surrounding a space between the housing 30 and the plate 60 and a connection member 65 connected to a lower portion of the plate 60 and having a plate- And a cylinder 80 into which a lower armature 70 and a mover 75 are inserted.

5 is a perspective view of a lower portion of a cylinder and a sealing member of an electromagnetic contactor according to an embodiment of the present invention, and FIG. 6 is a cross-sectional view of an electromagnetic contactor according to an embodiment of the present invention. Fig. 8 is a shrinkage and extension state view of the sealing member according to the embodiment. Fig.

 An electromagnetic contactor according to an embodiment of the present invention will be described in detail with reference to the drawings.

The housing 30, the lower housing 35, the support body 50, the plate 60, the connecting body 65 and the cylinder 80 will be described in terms of spatial and structural aspects.

The housing 30 is formed in a rectangular parallelepiped shape having a bottom open. The housing 30 is made of a material excellent in corrosion resistance and heat resistance, such as ceramic. A groove is formed on the upper surface of the housing 30 so that the stationary contactor 10 is fitted.

And the lower housing 35 is coupled to the lower portion of the housing 30. And serves to close the lower portion of the housing 30 after the movable contact 20 or the like is inserted into the housing 30. A hollow portion is formed at the center of the lower housing 35 so that the driving shaft 40 can be slid up and down.

The support body 50 is coupled directly below the hollow portion of the lower housing 35. The support body (50) supports the drive shaft (40) directly while allowing the drive shaft (40) to move up and down smoothly.

The plate (60) is coupled to the lower portion of the support (50). The plate 60 is formed of a flat plate, and a hollow portion is formed at the center thereof to support and support the housing 30, the lower housing 35, and the support body 50.

A connector (65) is coupled between the housing (30) and the plate (60). The connection body 65 is formed to surround the lower end surface of the housing 30 to seal the space formed by the housing 30 and the plate 60. The connecting body 65 is preferably joined by welding or the like in order to ensure the airtightness of the internal space.

The cylinder 80 is coupled to the lower portion of the plate 60. The driving shaft 40, the stator 70, the mover 75 and the like are inserted into the cylinder 80 and serve to form an airtight space in the lower portion of the plate 60. The cylinder 80 is preferably welded to maintain airtightness with the lower portion of the plate 60. According to the laser welding method, the manufacturing will be simplified. The cylinder 80 also serves to guide the driving shaft 35 coupled to the mover 75 and the mover 75 by the electric force of the armature 72 when the driving shaft 35 is lifted.

Thereby, the housing 30, the connecting body 65, the plate 60 and the cylinder 80, in which the stationary contactor 10 is fitted, form a closed airtight space, and the airtight space is filled with insulating gas and sealed will be.

The actuator including the stationary contactor 10, the movable contact 20, the drive shaft 40, the armature 72 and the mover 75 will be described in terms of operation.

The stationary contactor 10 is fitted on the upper portion of the housing 30 and is a terminal connected to a load (for example, a wiper motor of an automobile, a direction indicator, an engine of an electric car, etc.) The large-diameter end portion formed on the upper portion of the stationary contactor 10 is connected to the load, and the small-diameter end portion formed on the lower portion is in contact with the movable contactor 20. The stationary contactor (10) is formed with a groove on the end side with a large diameter, so that the contact terminal of the load can be inserted.

The movable contact 20 is a terminal that is inserted into the housing 30 and contacts or separates from the stationary contactor 10. The movable contact 20 is in contact with the end of the above-mentioned fixed contact 10 whose diameter is made small. The movable contact 20 is a plate-shaped body having a predetermined thickness and formed on a surface facing the stationary contact 10. The movable contact 20 is fixed to the drive shaft 40 so that the drive shaft 40 is linearly driven in the axial direction and is brought into contact with or separated from the stationary contactor 10. At the center of the movable contactor 20, a through hole is formed perpendicularly to a flat piece opposed to the stationary contactor 10, and one end of the drive shaft 40 passes through.

The actuator is a driving device for contacting or separating the movable contactor 20 with the stationary contactor 10 by a magnetic force. Such an actuator includes an armature 72, a mover 75, a bobbin 73, a drive shaft 40, and a return spring 76.

The armature 72 includes a stator 70 and a coil 71, and generates a magnetic force when power is applied. The coil 71 is wound around the bobbin 73 and the stator 70 is provided inside the coil 71 and specifically inside the cylinder 80. The stator 70 has a cylindrical shape and a through hole is formed along the central axis so that the driving shaft 40 is linearly driven. A groove is formed in the lower portion of the stator 70 so that one end of the return spring 76 is inserted between the stator 70 and the outer surface of the drive shaft 40.

The movable member 75 is also referred to as an armature. The movable member 75 is cylindrical and has the same diameter as the stator 70 described above. The through hole is formed along the central axis, and the other end of the drive shaft 40 is fixedly inserted. The movable member 75 is moved upward by the electric force generated by the armature 70. A groove is formed in the upper portion of the mover 75 so that the other end of the return spring 76 is inserted between the mover 75 and the outer surface of the drive shaft 40. When no magnetic force is generated in the armature 70, the mover 75 returns to the initial position where it is separated from the stator 70 by the return spring 76.

The bobbin 73 is a cylindrical shape having flanges formed at both ends thereof, and the coil 71 described above is wound between the flanges of the bobbin 73. The bobbin 73 is also provided with a through hole for accommodating the above-described stator 70 and the mover 75 so as to be axially spaced apart along the central axis.

The drive shaft 40 is a rod-shaped long shaft fixed at one end to the movable contact 20 and the other end to the mover 75. Further, the driving shaft 40 passes through the stator 70 and moves in the axial direction. The drive shaft 40 includes a flange protruding radially along the outer diameter at a predetermined distance from an end of the movable contact 20 to which the movable contact 20 is fixed. A compression spring 45 is fixed to the upper part of the flange. The flange also serves as a latching jaw for preventing the drive shaft 40 from being moved downwardly at the upper end of the support body 50. [

However, the above-described actuator is not limited to this configuration, and may be any structure in which the drive shaft 40 is linearly driven in the axial direction by a magnetic force so that the movable contactor 20 contacts and separates from the stationary contactor 10.

The description will be made with respect to the injection and sealing of the insulating gas in the hermetic space of the electromagnetic contactor.

A part of the cylinder 80 is provided with an opening hole 85 (see FIG. 1) so that gas can be injected into the airtight space formed by the housing 30, the connecting body 65, the plate 60 and the cylinder 80, Is formed. In this embodiment, an opening 85 is formed in the lower surface of the cylinder 80.

The sealing member 90 is fitted in the opening hole 85 to seal the cylinder 80. That is, when the airtight space is filled with an insulating gas and then the cylinder 80 is to be sealed, the airtight space is expanded so as to be in close contact with the opening hole 85 of the cylinder 80 so as to prevent the internal gas from leaking. The sealing member 90 is shrunk to separate the sealing member 90 from the opening hole 85.

6 and 7, a sealing member 90 having a vertical section 91 and a horizontal section 92 and having a T-shaped cross section is shown as an embodiment of the sealing member 90. As shown in FIG.

The vertical portion 91 of the sealing member 90 is contracted to easily fit into the opening hole 85. However, when the sealing member 90 is expanded by heat or the like, the vertical portion 91 is expanded and deformed, The surface is compressed to seal the airtight space.

On the other hand, such a sealing member 90 may be formed of a shape memory alloy. Shape Memory Alloy (SMA) is an alloy that remembers its original shape and returns to its original shape at a constant temperature even if it is deformed. Such a shape memory alloy is characterized in that a shape stored at a high temperature is deformed at room temperature and then heated to a shape at the original high temperature, And anisotropic shape memory alloys in which two shapes are repeatedly repeated when cooling is repeated. Here, it is known that the temperature at which deformation occurs can be set by controlling the composition ratio of the alloy between -150 캜 and 200 캜.

When the unidirectional shape memory alloy is used, the sealing member 90 exhibits a contracted state at room temperature but expands at a set deformation temperature (first temperature), for example, 100 占 폚 or more, And the sealability is maintained.

On the other hand, when the anisotropic shape memory alloy is used, the sealing member 90 exhibits a contracted state at a set deformation temperature (second temperature), for example, at -30 캜 or lower, but exhibits an expanded state at a temperature higher than the second temperature The pressure is applied to the opening hole 85 to maintain the sealing property.

Particularly, when the sealing member is made of the anisotropic shape memory alloy, the expansion and contraction are automatically caused by heating and cooling. Therefore, when the sealing member 90 made of such a shape memory alloy is utilized, It becomes possible to seal the opening hole 85 due to the expansion at a temperature higher than the temperature and to separate from the opening hole 85 due to the contraction at a temperature lower than the second temperature so that access to the airtight space and recharging of the insulating gas become possible.

Further, in the case where an O-ring (95) made of rubber or the like is additionally attached to the contraction portion of the sealing member 90 to expand the airtightness, the airtightness can be more reliably maintained.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it will be apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the invention, It is obvious that the claims fall within the scope of the claims.

10 fixed contacts 20 movable contacts
30 Housing 35 Lower housing
40 drive shaft 45 compression spring
50 support 60 plate
65 connector 70 stator
71 Coil 72 Armature
75 Mover 76 Return Spring
80 cylinder 85 through hole
90 sealing member 95 O-ring

Claims (4)

There is provided an electromagnetic contactor including a stationary contactor, a movable contactor which is brought into contact with or separated from the stationary contactor, and an actuator which drives the movable contactor to contact or separate from the stationary contactor,
A housing having a lower surface thereof opened, an upper surface thereof fitted with the stationary contactor, and a movable contactor inserted therein;
A plate having a center hollow portion and spaced apart from a lower portion of the housing;
A coupling member coupled between the housing and the plate; And
And a cylinder coupled to a lower portion of the plate,
An airtight space surrounded by the housing, the connector, the plate, and the cylinder is formed,
Wherein a part of the cylinder is provided with an opening hole through which gas can be injected into the gas tight space,
And an openable and closable sealing member is fitted in the opening hole.
The method according to claim 1,
Wherein the sealing member is formed of a shape memory alloy material,
And the sealing member expands at a temperature higher than the first temperature to compress and seal the opening hole.
The method according to claim 1,
Wherein the sealing member is formed of a shape memory alloy material,
And the sealing member is contracted to be detachable from the opening hole at a temperature lower than the second temperature.
The electromagnetic contactor according to claim 2 or 3, wherein the sealing member is covered with an O-ring.

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