KR20150117957A - Magnetic contactor - Google Patents

Abstract

The present invention relates to an electromagnetic contactor which comprises: a frame; a fixing contactor installed to be fixed inside the frame; an operating contactor installed to be able to contact or separate with the fixing contactor; and a cross bar installed to be movable inside the frame for moving the fixing contactor. The cross bar which is arranged to be spaced in the horizontal direction, and comprises: a plurality of insertion units inserting the operating contactor; and a connection member for connecting one end unit of the insertion unit to move the insertion unit as one single body. Accordingly, by removing the inter-phase operation imbalance, an opening and closing property can be stably maintained, and the electrical and mechanical durability of a product is improved.

Description

MAGNETIC CONTACTOR

The present invention relates to an electromagnetic contactor having a plurality of energizing structures for energizing a large current.

Electronic contactor / electronic switch is a device used in various control systems. It has high reliability not only for general industrial use but also for electric equipment and industrial automation which are required to have high reliability and durability, It is an innovative product designed with emphasis on module.

The electromagnetic contactor may include an upper frame and a lower frame.

And a fixed contact having a stationary contact formed inside the lower frame may be fixed.

The crossbars may be separately assembled in the upper frame and the lower frame so as to correspond to the respective phases of the three-phase AC power source.

FIG. 1 is a perspective view showing a conventional crossbar connected by a connecting pin. The crossbar 20 may include a plurality of movable contacts 21 for energizing a large current.

The crossbar 20 includes an insertion portion 20a into which at least three movable contacts 21 are inserted and protruded from the main board 14 to the lower space portion, As shown in FIG.

At least three insertion holes are provided in the inserting portion 20a, and the movable contacts 21 are inserted into the crossbar 20 through the insertion holes and are connected in parallel, so that the conductivity can be improved.

The crossbars 20 are spaced apart from one another in the transverse direction within the frame and connected by a connecting pin 22 passing across the end of the connecting portion 20b of the crossbar 20 so as to be operated simultaneously .

Two coil assemblies 15 are installed in the diagonal direction within the frame with the connection pin 22 interposed therebetween so that a suction force can be generated by the electromagnet.

A movable core may be disposed on the coil assembly, and the link pin may be mechanically connected to the movable core by a link member provided on one side of the movable core.

The opening and closing operation of the electromagnetic contactor constructed as described above will be described below.

When power is applied to the coil assembly, a magnetic field due to an electromagnetic force is generated in the coil assembly, and the movable core is lowered by being pulled toward the coil assembly by the magnetic field.

Since the crossbar 20 is connected by the connecting pin 22, the three crossbars 20 can be lowered together.

Since the movable contact 21a of the movable contact 21 mounted on the inserting portion 20a of the cross bar 20 contacts the fixed contact 13a of the fixed contact 13, And can be supplied to a load side such as a motor.

On the other hand, if an abnormal current such as an overcurrent flows through the main contact point of the electromagnetic contactor, it is detected by a detecting means such as an overload relay or the like, then the power applied to the coil assembly is cut off, Can be blocked.

However, in the electromagnetic contactor according to the related art, a connecting pin 22 for connecting the corresponding crossbar 20 separately mounted on each phase is required to simultaneously drive three parallel-connected movable contacts 21, Even when the input signals (for example, suction force) are generated simultaneously in the assembly, slight phase imbalance and operation time difference may occur between the crossbars arranged in the diagonal direction due to mechanical differences.

As a result, when the main contact point is cut off, the impact is applied to the crossbar 20, which is operated later, to cause deformation and damage, and the opening and closing performance deteriorates.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above problems, and it is an object of the present invention to provide an electromagnetic contactor capable of improving lifetime extension and opening / closing performance by eliminating unbalanced operation between phases of a crossbar.

According to an aspect of the present invention, there is provided an electromagnetic contactor including a frame, a stationary contactor, a plurality of movable contacts, and a crossbar.

The frame can achieve the appearance of the product.

The stationary contactor is fixedly installed inside the frame, and can be connected to a power source to receive power.

The movable contactor is provided so as to be contactable with or detachable from the stationary contactor, and can be connected to a load side such as a motor to supply power.

The crossbar is movably installed inside the frame, and can support and move the plurality of movable contacts.

Here, the crossbar may be composed of a plurality of inserting portions and connecting members for connecting the inserting portions.

The plurality of inserting portions are disposed to be laterally spaced apart, and the movable contactor can be inserted into the inserting portion.

The connecting member may connect the plurality of insertion portions in a straight line so that the plurality of insertion portions can be integrally operated.

As a result, the movable contacts of each phase inserted into the inserting portion are simultaneously moved, thereby eliminating the imbalance between phases and improving the lifetime extension and opening / closing performance of the electromagnetic contactor.

In one embodiment, the inserts may be arranged in at least three so as to correspond to the three phases of the AC power source.

In addition, the first inserting parts disposed at both ends of the inserting part may have one side opened and the other side closed, and an inserting hole is provided therein so that the movable contact can be inserted and mounted.

In addition, the second inserting portion positioned at the middle of the inserting portion is closed on all sides, and the inserting hole is provided therein, so that the movable contactor can be inserted and mounted.

In one embodiment, the movable contact may have an annular fixing plate attached to both sides thereof so as to protrude in the thickness direction thereof.

In addition, the fixing plate may be respectively fitted to both inner side walls of the insertion portion.

Further, the movable contact can be fixed to the insertion portion by a fixing pin inserted through the through-hole of the fixing plate.

In one embodiment, the insert has a mounting groove at a lateral corner end, so that the fixing pin can be inserted and mounted in the mounting groove.

In one embodiment, at least two movable contacts may be mounted inside the insertion portion.

In one embodiment, the insertion portion may have a partition for partitioning the insertion space into which the movable contact is inserted into at least two.

In one embodiment, the connecting member may have protrusions formed on both sides thereof perpendicularly protruding from the insertion portion, and having a coupling hole on one side.

Thus, it is possible to connect the crossbar and the movable core through the engagement hole of the protrusion.

In one embodiment, the crossbar may be operated by a coil assembly and a movable core that generates a driving force by an electromagnet.

In addition, the coil assembly and the movable core are installed in the frame with at least two sets, one of the two sets of movable cores is connected to one side of the crossbar, and the other set of the two sets The core may be connected to the other side of the crossbar to drive the crossbar.

The connecting member may include guide protrusions formed integrally at both ends thereof.

The frame is provided with guide grooves on both sides thereof to movably receive and support the guide protrusion, and guide the straightness of the guide protrusion.

As described above, in the electromagnetic contactor of the present invention, a plurality of movable contacts provided for each phase can operate simultaneously on the integrated crossbar.

Thus, the opening and closing characteristics can be stably maintained by eliminating the unbalance between phases, and the electrical and mechanical durability of the product is improved.

1 is a perspective view showing a state where a crossbar according to a related art is connected by a connecting pin.
2 is a perspective view of an electromagnetic contactor according to the present invention.
FIG. 3 is a perspective view showing a state in which the upper frame is removed in FIG. 2. FIG.
4 is a perspective view showing the crossbar structure of the present invention.
5 is a bottom view of Fig.
6 is a side view of Fig.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains.

FIG. 2 is a perspective view of an electromagnetic contactor according to the present invention, FIG. 3 is a perspective view showing a state where an upper frame is removed in FIG. 2, FIG. 4 is a perspective view showing a crossbar structure of the present invention, Fig. 6 is a side view of Fig. 4. Fig.

The present invention relates to an electromagnetic contactor (100) having an integral crossbar (120) capable of eliminating the phase difference operation imbalance.

The electromagnetic contactor 100 according to the present invention may include a frame 110, a crossbar 120, a movable contact 130, and a fixed contact 140, and the like.

The frame 110 constitutes an outer shape of the electromagnetic contactor 100 and holds the frame thereof. The frame 110 may include an upper frame 111 and a lower frame 112.

The upper frame 111 may be in the form of a box that opens directly below.

A slit 111a is formed in the upper center of the upper frame 111 so that the upper end of the crossbar 120 can be manually pressed through the slit 111a to open and close the main contact portion.

For example, when the movable contactor 130 is lowered due to the pushing action of the crossbar 120 and contacts the fixed contactor 140, the main contact portion can be brought into contact with the movable contactor 140. When the crossbar 120 is depressed, The movable contactor 130 returns to its original position and the main contact portion may drop.

A coupling portion 113 is formed at a side edge portion of the upper frame 111. A through hole is formed in the coupling portion 113. A coupling member such as a screw or bolt is inserted through the through hole, have.

The lower frame 112 may be in the form of a box that is open to the upper chamber.

A coupling portion 113 is formed at a side edge portion of the lower frame 112 and a female threaded portion is formed inside the coupling portion 113. The coupling member is fastened to the female threaded portion, The frame 112 can be assembled.

In addition, when the fastening member is released, the upper frame 111 and the lower frame 112 can be separated.

The upper frame 111 may have an upper space portion therein to accommodate a portion of the crossbar 120, the movable contactor 130, and the stationary contactor 140.

The lower frame 112 may include a lower space portion to accommodate the coil assembly and the movable core.

The cross bar 120 may be movably installed inside the frame 110.

The crossbar 120 may include an insertion portion 121 into which the movable contact 130 is inserted and a connection member 122 that supports the insertion portion 121.

The insertion portion 121 has an insertion hole therein, and the movable contact 130 can be inserted through the insertion hole.

The inserting portion 121 may have at least three corresponding to the three phases of the AC power source.

The insertion portions 121 may be spaced apart from each other at regular intervals in the lateral direction.

The insertion portion 121 may protrude into the upper hollow portion and be inserted.

The connecting member 122 may be arranged to transversely cross the lower end of the insertion part 121 and connect the lower end of the insertion part 121 in a line.

And guide projections 125 may be provided on both side end surfaces of the connecting member 122 so as to protrude therefrom.

In addition, guide grooves 112a may be formed on both sides of the lower frame 112 in the vertical direction.

The guide protrusion 125 is inserted into the guide groove 112a so as to be movable in the up and down direction to guide the straightness of the cross bar 120. [

In other words, the guide protrusion 125 can stably maintain the vertical movement of the cross bar 120.

In addition, a protrusion 123 may protrude from the one side surface and the other side surface of the connecting member 122 in the longitudinal direction.

At least two coupling holes 124 may be formed in the protrusion 123.

The coupling hole 124 may serve as a connection passage for connecting the crossbar 120 and the movable core.

The movable core may be connected to the crossbar through a moving core supporter 160.

For example, the movable core supporter 160 may be fixed with the movable core, and the movable core supporter 160 may be coupled with the crossbar 120 by a fastening means such as a screw or the like.

The screw may be inserted through a coupling hole 124 formed in the protrusion 123 of the cross bar 120 to couple the crossbar 120 and the movable core supporter 160 together.

The insertion portion 121 may include a first insertion portion 121a and a second insertion portion 121b.

The first insertion portion 121a may be positioned at both ends of the three insertion portions 121.

The second inserting portion 121b may be located in the middle of the three inserting portions 121.

The first insertion portion 121a may have a rectangular shape in which the upper side is opened and the remaining three sides are closed.

The second inserting portion 121b may be formed in the shape of a quadrilateral with all four sides thereof closed.

At least two movable contacts 130 may be inserted and inserted per one insertion part 121.

The first insertion portion 121a and the second insertion portion 121b may include at least one partition wall 127 protruding upward and downward in the middle of the insertion hole.

The insertion holes provided in the first insertion portion 121a and the second insertion portion 121b may be partitioned into at least two insertion holes by the partition wall 127. [

At least one movable contact 130 may be inserted into the partitioned insertion hole.

A coil spring is disposed on the bottom surface of the middle portion of the movable contactor 130 so that the movable contactor can be elastically supported by the coil spring.

The coil spring may be supported by a U-shaped fixing plate.

And fastening holes may be formed on both upper ends of the fixing plate.

The movable contact can be fixed on the coil spring so that the fastening hole of the fastening plate 131 protrudes upward from the side upper end of the movable contact.

The fixing plate 131 can be used to fix the movable contact 130 to the insertion portion 121.

The movable contact is inserted into the fixed plate, is elastically supported by a coil spring, and can be moved up and down.

The movable contact 130 may be fixed to the first insertion portion 121a and the second insertion portion 121b by a fixing pin 132 passing through the through hole of the fixing plate 131. [

A fixing groove is formed in the middle of the upper surface of the movable contactor 130, and the movable contactor can be fixed to the coil spring by inserting the fixing pin 132 into the fixing groove.

The first insertion portion 121a and the second insertion portion 121b may have mounting grooves 126 at their upper ends and both ends of the fixing pins 132 are fitted into the mounting grooves 126, The second insertion portion 130 can be supported by the first insertion portion 121a and the second insertion portion 121b, respectively.

 The fixing plate 131 is fitted into the inner wall of the insertion part 121 so as to be in contact therewith so that the side surface of the movable contact 130 can be stably supported without moving left and right.

The first inserting portion 121a and the mounting groove 126 formed at the upper end of the first inserting portion 121a are opened upward so that the assembling of the movable contactor 130 can be facilitated.

The upper end of the second inserting portion 121b may provide a manual operation point for pushing operation through the slit 111a of the upper frame 111 from the user.

A mounting groove 126 is formed in the upper ends of both side surfaces of the second insertion portion 121b so that the fixing pin 132 is inserted into the mounting groove 126 As shown in Fig.

The movable contact 130 may be provided with movable contacts 130a on the bottom surfaces of both end portions as electrical conductors.

The terminal 150 may be provided on the upper portion of the lower frame 112 to correspond to three phases.

The terminal 150 may be divided into a power source side terminal 150 to which an external power source is connected and a load side terminal 150 to which a load side such as a motor is connected.

The power source side terminal 150 and the load side terminal 150 may be spaced apart from each other with the crossbar 120 interposed therebetween.

The power source terminal 150 may be vertically disposed on one side of the crossbar 120.

The load-side terminal 150 may be disposed perpendicularly to the other side of the crossbar 120.

The power source side terminal 150 and the load side terminal 150 may be spaced apart from each other at the upper end of the lower frame 112 for each phase.

One end of each of the power source side terminal 150 and the load side terminal 150 may be assembled so as to be fixed to the inside of the lower frame 112 and the other end thereof may be exposed to the outside of the frame 110.

The stationary contactor 140 may be fixed to the upper surface of the power source terminal 150 and the load terminal 150, respectively.

The fixed contact 140 may have a U-shaped cross-sectional plate structure when viewed from the lateral direction.

The U-shaped cross-sectional plate may be laid down on the power supply side terminal 150 and the load side terminal 150.

The plate located at the upper one of the lying U-shaped sectional plates may be C-shaped opened in the longitudinal direction as viewed from above.

The fixed contact 141 may be provided on the upper portion of the fixed contact 140 so as to be adjacent to the middle of the closed side of the C shape.

The stationary contactor 140 having the C-shaped plate can induce and disperse the arc generated at the time of short-circuiting between the movable contact 130a and the stationary contact 141 to the end of the C-shaped plate.

A shield member 151 may be inserted between the first insertion portion 121a and the second insertion portion 121b.

The shield member 151 may be disposed across the fixed contacts 140, which are correspondingly spaced apart from each other in three phases.

Thereby, it is possible to prevent the arc generated between the contacts from diffusing into the neighboring phases.

In addition, an insulating plate 152 may be provided on the outer side of the frame 110 so as to be spaced laterally.

The insulating plate 152 is inserted across the terminals 150 provided for each phase, so that the insulation distance and insulation between phases can be ensured.

A coil assembly may be installed within the lower frame 112.

The coil assembly includes a coil wound on a bobbin. When the coil is powered, a magnetic field is generated by the electromagnet to provide a driving force (for example, suction force).

At least two coil assemblies may be installed.

Although the position of the coil assembly is not critical, it may be at any position as long as it can be evenly transmitted to the crossbar 120 with the driving force generated in the coil assembly.

The movable core may be disposed on top of the coil assembly.

The movable core is movably installed inside the lower frame 112 and can be supported by the crossbar 120.

The movable core may also be located on top of the coil assembly.

One of the movable cores may be mechanically connected to one side of the crossbar 120 and the other may be mechanically connected to the other side of the crossbar 120.

The movable core may be pulled downward by the suction force generated in the coil assembly to lower the crossbar 120.

Here, the coil assembly and the movable core may be configured as one set, and at least two sets of the coil assembly and the movable core may be embedded in the lower frame 112.

A plurality of movable contacts 130 connected in parallel to the crossbar 120 as an integral operation structure are assembled as a conductive part and the movable contacts 130 are brought into contact with or separated from the fixed contacts 140 The circuit can be opened and closed.

The plurality of movable contactors 130 are inserted into the inserting portions 121 arranged in each phase and the inserting portions 121 are integrally connected by the connecting member 122, And the three-phase movable contacts 130 are operated simultaneously.

Therefore, according to the present invention, since the existing movable contact 130 of each phase operates individually, it is possible to eliminate the imbalance between phases.

Further, the opening and closing characteristics of the movable contactor 130 can be stably maintained, and the electrical and mechanical durability can be improved.

Moreover, the structure of the integrated crossbar 120 improves the contact pressure of the contact, which is effective in lowering the temperature rise due to the unbalance between phases.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments. Modified forms are also included within the scope of the present invention.

100: Magnetic contactor
110: frame
111: upper frame
111a: slit
112: lower frame
112a: guide groove
113:
120: Crossbar
121:
121a:
121b:
122:
123:
124:
125: guide projection
126: mounting groove
127:
130:
130a: movable contact
131: Fixing plate
132: Fixing pin
140: fixed contacts
141: Fixed contact
150: terminal
151: shield member
152: insulating plate
160: movable core supporter

Claims (9)

frame;
A stationary contactor fixedly installed inside the frame;
A movable contactor provided so as to be contactable with or detachable from the stationary contactor;
A crossbar movably installed in the frame, the crossbar moving the movable contact;
Lt; / RTI >
The crossbar includes:
A plurality of insertion portions arranged to be laterally spaced apart and into which the movable contacts are inserted; And
A connecting member for connecting one end of the insertion unit so that the plurality of insertion units are integrally moved;
. The method according to claim 1,
Wherein the inserting portion is disposed in at least three positions corresponding to the three phases of the ac power source,
Wherein the first insertion portion disposed at both ends of the insertion portion has one side opened and the other side closed, an insertion hole provided therein, the movable contact is inserted and mounted,
Wherein the second inserting portion located in the middle of the inserting portion is closed on all sides, and the inserting hole is provided therein, so that the movable contactor is inserted and mounted. The method according to claim 1,
Wherein the movable contact has a ring-shaped fixed plate attached to both side surfaces thereof so as to protrude in the thickness direction thereof,
The fixing plate is inserted into both side walls of the inserting portion,
And the movable contact is fixed to the insertion portion by a fixing pin inserted through the through hole of the fixing plate. The method of claim 3,
Wherein the insertion portion is provided with a mounting groove at a side edge end thereof, and the fixing pin is inserted and mounted in the mounting groove. The method according to claim 1,
Wherein at least two of the movable contacts are mounted inside the inserting portion. 6. The method of claim 5,
Wherein the insertion portion has a partition for partitioning the insertion space into which the movable contact is inserted into at least two. The method according to claim 1,
Wherein the connecting member is protruded from both sides of the insertion portion perpendicular to the insertion portion, and has a projection having a coupling hole at one side thereof. The method according to claim 1,
Wherein the crossbar is operated by a coil assembly and a movable core which generate a driving force by an electromagnet,
Wherein the coil assembly and the movable core are installed in the frame with at least two sets, one of the two sets of movable cores is connected to one side of the crossbar, and the other set of movable cores And is connected to the other side of the crossbar. The method according to claim 1,
Wherein the connecting member has guide protrusions integrally formed at both ends thereof,
Wherein the frame has a guide groove into which the guide protrusion is inserted and guides the movement of the guide protrusion.

Images