KR20160122359A - Actuator having adjustable spring force - Google Patents

Abstract

Disclosed is an actuator applied to a shout trip (SHT) device and an under voltage trip (UVT) device, that are additional devices converting an open circuit state of a circuit breaker for a wiring into a closed circuit state or preventing the closed circuit state from being converted into the open circuit state, and more specifically, to an actuator that helps to stabilize quality by adjusting core retention force. According to the present invention, the actuator comprises: a yoke having a receiving space formed therein; a bobbin provided inside the yoke; a coil wound around the circumference of the bobbin to generate magnetic force; a magnet provided inside the yoke; a fixing core fixed to one side of the inside of the bobbin; a moving core movably disposed on the other side of the inside of the bobbin; a moving rod connected to the moving core to move along with the moving core; an elastic member connected to the moving rod, and providing elastic force in a direction in which the moving core is in close contact with the fixing core; and an elastic force adjusting unit formed to adjust the size of force of restitution of the elastic member.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an ACTUATOR HAVING ADJUSTABLE SPRING FORCE,

The present invention relates to an SHT (shout trip) device which is an additional device for switching the operating state of a circuit breaker for switching from a open state to a closed state or for preventing an open state from being closed, and an actuator applied to an under voltage trip And more particularly, to an actuator that can stabilize quality by making core holding force adjustable.

An SHT (shout trip) device and an under voltage trip (UVT) device, which are additional devices of a wiring breaker, are devices for switching the operation state of a circuit breaker from an open state to a closed state or from being opened in a closed state.

Such a device operates a mechanical part by using a relationship between a holding force and an electric force generated when a moving core of a coil assembly is bonded. When the magnitude of the force is larger than the elastic force applied by the elastic member, The circuit breaker keeps the open state of the circuit breaker, but if not, the circuit breaker keeps the circuit breaker in accordance with the operation between the movable core and the fixing core.

At this time, the retention force standard for operation is the most sensitive management standard in production, and product characteristics are changed according to this retention force.

FIG. 1 is an exploded perspective view showing a structure of a general actuator, and FIG. 2 is a sectional view showing an internal structure of a general actuator.

1, the actuator 10 includes a coil assembly 12, and an upper case 11 and a lower case 13 which are coupled to each other to surround the outer side of the coil assembly 12.

2 is a sectional view showing an internal structure of a coupled state of the actuator.

The coil assembly 12 is enclosed by the upper case 11 and the lower case 13. A magnet 12a and a coil 12b, which generate a magnetic force, are disposed inside the coil assembly 12, An elastic member 12c for providing a restoring force, a fixed core 12d fixed to one side of the inside of the coil 12b and a movable core 12e moving relative to the fixed core 12d.

The actuator 10 operates the mechanical unit using the relationship between the magnetic force applied to the movable core 12e and the restoring force provided by the elastic member.

As a related prior art, Korean Patent Laid-Open No. 10-2008-0034776 (published on April 22, 2008) has an 'actuator'.

An object of the present invention is to provide an actuator having a structure capable of adjusting a restoring force of an elastic member in a assembled state without disassembling the coil assembly.

Another object of the present invention is to provide an actuator capable of reducing the quality deviation caused by the assembly tolerance by adjusting the holding force of the actuator by adjusting the restoring force of the elastic member.

The present invention relates to a yoke for forming a receiving space therein; A bobbin provided inside the yoke; A coil wound around the bobbin to generate a magnetic force; A magnet disposed inside the yoke; A fixed core fixed to an inner side of the bobbin; A movable core movably disposed on the other side inside the bobbin; A movable rod coupled to the movable core and moving together with the movable core; An elastic member connected to the movable rod to provide an elastic force in a direction in which the movable core is in close contact with the fixed core; And an elastic force adjusting unit configured to adjust a magnitude of a restoring force of the elastic member.

The elastic force adjusting unit may include an engaging groove formed in an elastic member engaging section of the movable rod, and an elasticity adjusting plate detachably attached to the engaging groove.

At this time, the elasticity adjusting plate may be selected from a plurality of types having various thicknesses.

In another embodiment, the plurality of coupling grooves may be formed to adjust the position of the elasticity adjusting plate.

The elastic force adjusting unit may include a helical groove formed in an elastic member engaging section of the movable rod and a moving plate coupled to the helical groove to adjust the position.

According to another aspect of the present invention, the elastic force adjusting unit may include an adjusting bolt having a head portion which is screwed to the movable rod to adjust the position thereof and supports the outer side of the elastic member.

The magnetic force generated in the coil may be formed in a direction that cancels the magnetic force of the magnet, or may be formed in the same direction as the magnetic force generated in the magnet.

The actuator according to the present invention provides a structure capable of adjusting the holding force without disassembling the coil assembly. Therefore, it is not necessary to disassemble and reassemble the actuator when a quality deviation occurs, thereby reducing the work flow.

Further, the actuator according to the present invention has the effect of adjusting the restoring force of the elastic member without disassembling and assembling even if the restoring force of the elastic member is changed due to long-term use.

Therefore, the actuator according to the present invention improves the quality deviation and provides an effect of manufacturing an actuator with uniform performance.

1 is an exploded perspective view showing a structure of a general actuator,
2 is a sectional view showing the internal structure of a general actuator,
3 is a perspective view illustrating an actuator capable of adjusting the core holding force according to the first embodiment of the present invention,
4 is a cross-sectional view illustrating an actuator capable of adjusting core holding force according to the first embodiment of the present invention,
FIG. 5 is a view illustrating a path to a self-supporting retainer in a suction state of an actuator capable of adjusting a core holding force according to a first embodiment of the present invention;
6 is an enlarged perspective view of an elastic force adjusting unit of an actuator capable of adjusting a core holding force according to the first embodiment of the present invention.
7 is a view illustrating an actuator capable of adjusting a core holding force according to a second embodiment of the present invention,
8 is a view illustrating an actuator capable of adjusting a core holding force according to a third embodiment of the present invention.
9 is a view showing an actuator capable of adjusting the core holding force according to the fourth embodiment of the present invention.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or preliminary meaning and the inventor shall properly define the concept of the term in order to describe its invention in the best possible way It should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention. It should be noted that the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention, It should be understood that various equivalents and modifications are possible.

FIG. 3 is a perspective view showing an actuator capable of adjusting the core holding force according to the first embodiment of the present invention, and FIG. 4 is a sectional view showing an actuator capable of adjusting the core holding force according to the first embodiment of the present invention.

An actuator 100 according to the present invention has a structure in which a coil assembly is assembled between an upper case 11 and a lower case 13. [

However, the actuator 100 according to the present invention is characterized in that the holding force can be adjusted without detaching the coil assembly.

4, the actuator 100 capable of adjusting the core holding force according to the embodiment of the present invention includes a yoke 110 that forms a receiving space therein, a yoke 110 that is provided inside the yoke 110, A coil 130 wound around the bobbin 120 to generate a magnetic force, a magnet 140 provided inside the yoke 110, and a fixing member 130 fixed to one side of the bobbin 120. [ A movable core 160 which is movably disposed on the other side of the bobbin 120 and a movable rod 170 which is connected to the movable core 160 and moves together with the movable core 160, An elastic member 180 connected to the movable rod 170 to provide an elastic force in a direction in which the movable core 160 is brought into close contact with the fixed core 150 and an elastic member 180 formed to be capable of adjusting the elastic force of the elastic member 180 And an elastic force adjusting unit 190.

The actuator 100 has a generally cylindrical shape and includes a yoke 110, a plate yoke 115, a bobbin 120, and a coil 130 surrounding the fixed core 150 and the movable core 160, The magnet 140, and the plate shield 145) exist in a vertically symmetrical shape in the sectional view of FIG.

The state before the movable rod 170 is pushed is referred to as a released state, and the state in which the movable rod 170 is pushed is referred to as a suction state.

The movable rod 170 is formed in a circular rod shape and includes a large diameter portion having a diameter corresponding to the inner diameter of the fixed core 150 and a small diameter portion having a diameter corresponding to the inner diameter of the movable core 160.

Due to this structure, one end (right side in the figure) of the movable core 160 is supported by the step portion 175 whose diameter changes. A stationary plate 162 is provided at the other end of the movable core 160 (on the left side in the drawing) to fix the movable core 160 so as not to be separated from the movable rod 170. As a result, since both sides of the movable core 160 are confined to the movable rod 170, the movable core 160 moves integrally with the transverse rod 170.

FIG. 5 is a view illustrating a path to a self-holding force in a suction state of an actuator capable of adjusting a core holding force according to a first embodiment of the present invention, and FIG. 6 is a view illustrating a core holding force adjustment according to the first embodiment of the present invention. Which is an enlarged perspective view of an elastic force adjusting portion of a possible actuator.

5, the suction state is a state in which the movable core 160 is separated from the fixed core 150, and the elastic member 180 is compressed and the elastic force is stored.

The holding force for maintaining the suction state is due to the magnetic force. The magnitude of the magnetic force for fixing the position of the movable core 160 is larger than the restoring force of the elastic member 180, so that the suction state can be maintained.

On the other hand, the magnet 140 always generates a magnetic force with the permanent magnet, and the magnetic force changes according to the current applied to the coil.

The magnetic force generated in the coil 130 is opposite to the magnetic force generated in the magnet 140 according to the device to which the actuator is applied so that the magnetic force generated in the coil 130 can cancel the magnetic force generated in the magnet 140 The magnetic force generated in the coil 130 may be the same as the magnetic force generated in the magnet 140 so that the magnetic force generated in the coil 130 may reinforce the magnetic force generated in the magnet 140. [

When the magnetic force of the coil 130 is a type of canceling the magnetic force of the magnet 140, if a current of a predetermined value or more flows through the coil 130, the magnetic force for holding the fixed core 150 becomes weak, The state of release is switched to the released state.

When the magnetic force of the coil 130 reinforces the magnetic force of the magnet 140, if the current flowing through the coil 130 is lowered to a certain value or less, the magnetic force for holding the fixed core 150 becomes weak, And is released to the release state by the restoring force of the spring 180.

The magnetic force generated in the magnet 140 is transmitted to the plate yoke 115 and flows from the plate yoke 115 to the magnet 140 through the movable core 160 and the plate shield 145 do.

The actuator is operated by the relative magnitude of the holding force, which is the magnetic force for fixing the fixed core 150, and the restoring force of the elastic member 180. However, when the actual product is manufactured, the holding force is varied due to the tolerance during assembly .

The amount of the gap plate 147 interposed between the magnet 140 and the plate yoke 115 may be adjusted or the plate shield between the movable core 160 and the magnet 140 may be adjusted 145) to control the holding force.

The magnetic force between the magnet 140 and the fixed core 150 changes depending on whether the material of the plate shield 145 is a magnetic body or a nonmagnetic body so that the ratio of the magnetic body constituting the plate shield 145 is changed Respectively.

However, such a conventional holding force adjusting method has to change the components inside the assembled coil assembly, and it is troublesome to repeatedly perform disassembly and reassembly.

SUMMARY OF THE INVENTION The present invention has been made in order to solve such a conventional problem and it is characterized in that a quality deviation can be controlled without disassembling and assembling a coil assembly by providing a structure capable of adjusting an elastic force of an elastic member, .

As shown in the drawings, the actuator capable of adjusting the holding force according to the present invention is provided with an elastic force adjusting part capable of adjusting the elastic force, so that the holding force can be adjusted without disassembling and assembling the coil assembly.

Referring to FIG. 6, the first embodiment of the present invention is characterized in that the elastic force adjusting unit includes an engaging groove 192 formed in an elastic member engaging section of the movable rod, an elasticity adjusting plate 194 detachably attached to the engaging groove 192, .

As shown in the drawing, a plurality of coupling grooves 192 are formed to change the engagement position of the elasticity adjusting plate 194, so that the length of the elastic member can be varied to adjust the magnitude of the restoring force stored in the elastic member .

For example, as shown in FIG. 5, when three engagement grooves 192 are provided, the state in which the elastic control plate 194 is coupled to the center engagement groove is designed as a standard, The elasticity adjusting plate 194 is fastened to the coupling groove on the left side, and when the elasticity is excessive, the elasticity adjusting force can be adjusted by fastening the elasticity adjusting plate 194 to the defect groove on the right side.

Alternatively, as shown in FIG. 6, two engagement grooves are provided, and a state in which the elastic adjustment plate 194 is coupled to the right engagement groove is designed as a standard. When the elasticity is insufficient, The elasticity adjusting plate 194 may be fastened to the coupling groove, and when the elasticity is excessive, the elasticity adjusting plate 194 may not be fastened.

The number and position of the coupling grooves 194 and the characteristics of the individual actuators.

7 is a view illustrating an actuator capable of adjusting a core holding force according to a second embodiment of the present invention.

As shown in the drawing, in the second embodiment, only one coupling groove 192 is formed in the section 186 where the elastic member of the movable rod 180 is inserted, to which the elasticity adjusting plates 196a, 196b, and 196c are coupled, The restoring force of the elastic members can be adjusted according to the types of the elasticity adjusting plates 196a, 196b, and 196c that are coupled with the elasticity adjusting plates 196a, 196b, and 196c coupled to the coupling grooves 192, do.

196c and 196c are formed to have different thicknesses to press the elastic members 180 so that the elasticity control plates 196a, 196b, So that the magnitude of the restoring force provided by the elastic member 180 can be adjusted.

When the elasticity is weak, the thick elastic control plate 196c is tightened. When the elastic force is excessive, the thin elastic control plate 196a is tightened.

8 is a view illustrating an actuator capable of adjusting the core holding force according to the third embodiment of the present invention.

The third embodiment is different from the first embodiment in that a helical groove 193 is formed in the elastic member coupling section 186 of the movable rod 180 and the movable groove 193 is coupled to the helical groove 193, Plate (198).

In this structure, as the moving plate 198 is rotated clockwise or counterclockwise, the range in which the elastic member is compressed varies. When the moving plate 198 is moved to the left side, the restoring force of the elastic member is increased. When the moving plate 198 is moved to the right side, the restoring force of the elastic member is decreased.

In this structure, since the position of the moving plate 198 may be slightly changed at the time of repeated operation of the actuator, the position of the moving plate 198 may be adjusted to have a desired restoring force, It is desirable to fix it so that it is no longer movable.

9 is a view illustrating an actuator capable of adjusting a core holding force according to a fourth embodiment of the present invention.

The elastic force adjusting unit according to the fourth embodiment of the present invention is characterized in that the head supporting the outer side of the elastic member is separately screwed to the movable rod 170. [

An adjustment bolt 199 having a threaded portion 199b coupled to one side of the movable rod 170 and a head portion 199a supporting the outer side of the elastic member 180 is mounted on the movable rod 170 And the adjustment bolt 199 is adjusted to adjust the restoring force of the elastic member 180.

In the fourth embodiment, similarly to the third embodiment, in order to prevent the position of the adjustment bolt 199 from being changed by the repetitive operation of the actuator, the position of the adjustment bolt 199 is appropriately adjusted, It is preferable to fix the adjustment bolt 199 so that it can no longer move.

As described above, the actuator capable of adjusting the holding force according to the present invention provides a structure capable of adjusting the elastic force of the elastic member without disassembling and assembling the coil assembly, thereby controlling the quality deviation of the holding force caused by assembly tolerance Bring it.

It is to be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive, and the scope of the present invention will be indicated by the appended claims rather than by the foregoing detailed description. It is intended that all changes and modifications that come within the meaning and range of equivalency of the claims, as well as any equivalents thereof, be within the scope of the present invention.

100: Actuator
110: York
115: plate yoke
120: Bobbin
130: Coil
140: Magnet
145: Plate shield
147: gap plate
150: Fixed core
160: movable core
170: movable rod
180: elastic member
190:
192: coupling groove
194:
196a, 196b, 196c:

Claims (8)

A yoke defining a receiving space therein;
A bobbin provided inside the yoke;
A coil wound around the bobbin to generate a magnetic force;
A magnet disposed inside the yoke;
A fixed core fixed to an inner side of the bobbin;
A movable core movably disposed on the other side inside the bobbin;
A movable rod connected to the movable core and moving together with the movable core;
An elastic member connected to the movable rod to provide an elastic force in a direction in which the movable core is in close contact with the fixed core; And
And an elastic force adjusting unit configured to adjust a magnitude of a restoring force of the elastic member.
The method according to claim 1,
The elasticity-
An engaging groove formed in an elastic member engaging section of the movable rod; and an elasticity adjusting plate detachably attached to the engaging groove.
3. The method of claim 2,
Wherein the elasticity adjusting plate is selected from a plurality of types having various thicknesses.
3. The method of claim 2,
Wherein a plurality of coupling grooves are formed to adjust the position of the elasticity adjusting plate.
The method according to claim 1,
The elasticity-
And a movable plate coupled to the spiral groove and capable of adjusting the position of the spiral groove.
The method according to claim 1,
The elasticity-
And an adjusting bolt having a head portion which is screwed to the movable rod to adjust the position thereof and which supports the outer side of the elastic member.
The method according to claim 1,
And a magnetic force generated in the coil is formed in a direction that cancels the magnetic force of the magnet.
The method according to claim 1,
Wherein the magnetic force generated in the coil is formed in the same direction as the magnetic force generated in the magnet.

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