KR20160003469U - Trip Mechanism of Circuit Breaker - Google Patents

Abstract

The present invention relates to a trip mechanism for a wiring breaker, and more particularly, to a trip mechanism which is bent forward by heat and which is rotated when a bimetal and a bimetal having an operating portion at a free end are bent, The distance between the operating portion and the to-be-operated portion can be precisely controlled by preventing the flow of the adjusting dial and preventing the deformation or damage of the tool insertion groove The trip mechanism of the circuit breaker in which the adjustment dial is disposed is provided.

Description

Trip Mechanism of Circuit Breaker "

The present invention relates to a trip mechanism for a wiring breaker, more particularly, to an apparatus for preventing the movement of the adjusting dial to maintain an accurate setting interval, To a trip mechanism of a wiring breaker.

In general, MCCB (Molded Case Circuit Breaker) protects load devices and lines by automatically shutting off the circuit when an accident occurs due to opening or closing of load or abnormal current such as grounding or short circuit in the transmission and distribution system or electric circuit. It is a safety device.

For example, overcurrent, instantaneous current, and short-circuit current can be detected. Among them, tripping for instantaneous current is detected when a current having a constant rated current is momentarily applied to a circuit breaker for a wiring, It will make a trip within a reasonable time that does not damage the load. This characteristic is referred to as an instantaneous trip characteristic, and a device used for adjusting the trip time in such a circuit breaker is referred to as a trip mechanism.

Such a wiring breaker includes a main circuit unit having a fixed contact and a movable contact, an opening and closing mechanism for opening and closing the main circuit unit, a trip mechanism for shutting off the main circuit unit by operating the opening and closing mechanism at a trip position when a fault current flows through the main circuit unit trip mechanism. The movable contactor is brought into contact with or separated from the stationary contactor by an opening / closing mechanism. Therefore, when the opening / closing mechanism is operated by the trip mechanism to the trip position, the movable contact is separated from the fixed contact, whereby the main circuit unit is shut off.

The circuit breaker constructed as described above is disclosed in Korean Patent Registration No. 10-1276370 (published on Jun. 31, 2018).

1 is a perspective view of a trip mechanism 100 of a general wiring breaker. As shown in FIG. 1, the wiring breaker trip mechanism 100 is for detecting an overcurrent or the like to shut off the circuit. The circuit breaker trip mechanism 100 includes a heater 110 heated by a current flowing in the circuit breaker, An operating portion 120a disposed on the bimetal 120 and a trip shaft 130 and a to-be-operated portion 130a that move according to a curvature characteristic of the bimetal 120. The bimetal 120 includes a bimetal 120,

In this case, the trip time can be adjusted by adjusting the interval between the operation unit 120a and the to-be-operated unit 130a. In order to adjust the setting interval between the operation unit 120a and the to- A dial support member 160 for supporting the dial 140 is disposed. The structure of the conventional adjustment dial 140 will be described with reference to FIG.

6, the adjustment dial 1 is mounted on the dial placement hole 5 of the dial supporting member 4 in a state in which the dial body 1 of the adjustment dial 1 3 are inserted and the dial head portion 2 is formed so as to protrude from the dial placement hole 5. [

When the adjustment dial 1 is loosely coupled to the dial arrangement hole 5, the conventional adjustment dial 1 is not intentionally operated by an external impact or the like, and the tool insertion groove is not operated so that the operation portion 120a and the to- 130a may deviate from the set interval.

On the other hand, in order to prevent this, it is difficult to operate by hand when the adjustment dial 1 is closely fitted to the dial placement hole 5 by reflecting the interference dimension. Therefore, it is possible to operate using the tool insertion groove formed in the dial head portion 2. At this time, the tool insertion groove may be, for example, a cross shape. In operation using the tool insertion groove, Can be used.

However, in the conventional adjustment dial 1, since the adjustment dial 1 is tightly fitted to the dial placement hole 5 at the time of operating the adjustment dial 1, the rotation is not smoothly performed and the tool insertion There is a problem that the groove is deformed or damaged.

Therefore, it is possible to prevent the adjustment dial 1 from operating during operation of the adjustment dial 1, to prevent the operating portion 120a and the to-be-operated portion 130a from deviating from the set interval, There is a need for a trip mechanism 100 in which an adjustment dial 40 for preventing deformation or damage of the tool insertion groove is disposed.

It is an object of the present invention to provide a trip mechanism in which an adjustment dial is disposed so as to prevent the flow of the adjustment dial and to prevent the operation portion and the to-be-operated portion from deviating from a set interval .

It is also an object of the present invention to provide a trip mechanism in which an adjustment dial support member having a structure that facilitates rotation of the adjustment dial is disposed to prevent deformation or damage of the tool insertion groove.

The problems to be solved by the present invention are not limited to the above-mentioned problems, and other matters not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a trip mechanism of a circuit breaker for a wiring breaker, comprising: a bimetal bending forward by heat and having an operating part at a free end; And a trip shaft having a to-be-operated portion that is rotatably and horizontally movable forward of the bimetal and is operated to receive a rotational operation force from the operation portion and operates when the bimetal is bent when the bimetal is bent, And the operating portion and the to-be-operated portion are formed in such a manner that the height of a portion where the operating portion and the to-be-operated portion are in contact with each other is different in the left-right direction and the interval between the operating portion and the to- Wherein the trip adjustment unit comprises: an adjustment dial having a neck portion; A dial supporting member having a pair of resilient arms which are paired with each other to allow rotation of the adjusting dial to elastically grip the neck portion from both sides; And a motion direction converting means for converting the rotational motion of the adjusting dial into a rectilinear motion and transmitting the rectilinear motion to the trip shaft.

On the other hand, the dial support member includes a dial placement hole having the neck portion and a size smaller than that of the neck portion, a first incision portion located on one side of the dial placement hole, a first incision portion, A pair of elastic arms are provided between the dial arrangement hole and the first incision, wherein a pair of elastic arms are provided between the dial arrangement hole and the dial section to communicate the first incision section and the dial arrangement hole.

The dial support member is provided with a dial insertion hole into which the adjustment dial is inserted and which is located on the other side of the periphery of the dial placement hole, and a dial insertion hole is formed between the dial placement hole and the dial insertion hole, And a connection hole for moving the dial and positioning the dial in the dial arrangement hole.

At this time, a locking protrusion is provided at a portion where the dial arrangement hole and the connection hole meet, to prevent the adjustment dial located in the dial arrangement hole from moving toward the dial insertion hole.

Further, the adjustment dial has a head part and a body part connected to each other via the neck part, wherein the head part and the body part are larger than the neck part, and the dial insertion hole is larger in size than the body part , The width of the connection hole is larger than that of the neck portion and smaller than that of the body portion.

According to the present invention, by disposing the elastic arm on the adjustment dial support member, it is possible to prevent the adjustment dial from flowing and precisely adjust the setting interval between the operation unit and the to-be-operated unit to prevent the set interval between the operation unit and the to- have.

Further, since the pair of elastic arms arranged on the support member of the adjustment dial are spaced apart from each other, rotation of the adjustment dial is facilitated, and deformation or damage of the insertion tool groove can be prevented.

1 is a perspective view showing a trip mechanism of a general wiring breaker.
2 is an enlarged perspective view of an adjustment dial among trip devices of a wiring breaker.
3 is a perspective view of an adjustment dial support member according to an embodiment of the present invention.
4 is a perspective view of the adjustment dial support member with the adjustment dial of FIG. 4 inserted.
5 is a top view of an adjustment dial according to an embodiment of the present invention.
6 is a front view showing a conventional adjustment dial.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the present invention is not limited to or limited by the embodiments. In describing the embodiment of the present invention, corresponding elements are denoted by the same names and the same reference numerals.

FIG. 1 is a perspective view showing a trip mechanism of a circuit breaker according to an embodiment of the present invention, and FIG. 2 is an enlarged perspective view of the adjustment dial of FIG. 1 and 2, the trip mechanism 100 of the circuit breaker includes a bimetal 120, a trip shaft 130, and a trip adjustment unit (refer to reference numerals 140, 150, and 160).

The bimetal 120 is bent forward by heat, and the operation unit 120a may be provided at the free end. The operation portion 120a has an inclined surface, and the inclined surface forming member may be applied to the inclined surface. For example, the operation portion 120a may be a bimetal cap for covering the free end.

The trip shaft 130 is rotatably and horizontally movable in front of the bimetal 120 and has a to-be-operated portion 130a for receiving a rotational operation force from the operating portion 120a. When the bimetal 120 is rotated, The opening / closing mechanism (not shown) of the wiring breaker is operated at the trip position. At this time, the to-be-operated portion 130a of the trip shaft 130 may be a trip adjusting bolt.

One of the operation portion 120a and the to-be-operated portion 130a is formed such that the height of the portion that is in contact with the other of the operation portion 120a and the to-be-operated portion 130a is different in the left and right direction. Specifically, It may have an inclined surface. At this time, the application positions of the inclined surface forming member and the trip adjusting bolt may be changed with each other.

The distance between the operating portion 120a and the to-be-operated portion 130a is adjusted by a trip adjusting unit described later that moves the trip shaft 130 to the right and left.

The trip adjustment unit is configured to adjust the distance between the operation unit 120a and the to-be-operated unit 130a by moving the trip shaft 130 to the left and right. The trip adjustment unit includes the adjustment dial 140, the motion direction conversion unit 150, (160).

The adjustment dial 140 includes an insertion tool groove 142, a head portion 144, a neck portion 146, and a body portion 148.

The adjustment dial 140 has a head part 144 and a body part 148 connected to each other through a neck part 146. The head part 144 is formed protruding from the dial supporting member 160, An insertion tool groove 142 for rotating the adjustment dial 140 is formed by a tool such as a screwdriver or the like. It is preferable that the neck portion 146 is formed to have a predetermined thickness in a configuration in which the neck portion 146 is disposed below the head portion 144 and is fitted to a dial supporting member 160 which will be described later. The body portion 148 can be disposed below the neck portion 146 to support the entire adjustment dial 140. An eccentric rod 152, which will be described later, is formed at one side of the body portion 148 to convert the rotational motion of the adjusting dial 140 into a linear motion.

The outer periphery of the head part 144 and the body part 148 is preferably formed to have a larger size than the neck part 146. [

The insertion tool groove 142 is a directionally indicated groove, and the adjustment tool 140 can be rotated by operating the insertion tool groove 142 using a screwdriver or the like.

The direction converting means 150 converts the rotational motion of the adjusting dial 140 into a rectilinear motion and transmits the rotational motion to the trip shaft 130. The fork shaft 152 rotates the eccentric rod 152 and the eccentric rod 152 154).

The eccentric rod 152 is disposed on one side of the body portion 148 of the adjustment dial 140. When a screwdriver or the like is inserted through the tool insertion groove 142 and then the tool insertion groove 142 is rotated Eccentric rotation of the eccentric rod 152 pushes the fork 154, which will be described later, in one direction.

The fork 154 is a support member for supporting the tool insertion groove 142 from both sides and the lower side of the fork 154 is connected to the other side of the trip shaft 130. [ The fork 154 is pushed in one direction in accordance with the eccentric rotation of the eccentric rod 152 and the trip shaft 130 connected to the fork 154 is moved in one direction by the moving distance of the fork 154 .

Fig. 3 is a perspective view of an adjusting dial supporting member according to an embodiment of the present invention, and Fig. 4 is a perspective view of an adjusting dial supporting member inserted with the adjusting dial of Fig. 5 shows a top view of an adjustment dial according to an embodiment of the present invention. 3, 4 and 5, the dial supporting member 160 is preferably a member for supporting the adjusting dial 140 and formed as a plate-like member. The dial supporting member 160 is provided with a neck portion 146 and a dial placement hole 161 having a smaller size than the neck portion 146 and a first incision A second cutout portion 163 is provided between the first cutout portion 162 and the first cutout portion 162 and the dial placement hole 161 to allow the first cutout 162 to communicate with the dial placement hole 161 .

The dial supporting member 160 is provided with a pair of elastic arms 164 which are paired with each other so as to enable rotation of the adjusting dial 140 to elastically grip the neck portion 146 from both sides.

At this time, the pair of elastic arms 164 may be opened to be spaced apart from each other.

The adjustment dial 140 is inserted into the dial supporting member 160 and the dial insertion hole 165 can be located on the other side of the dial placement hole 161. The dial insertion hole 161 and the dial insertion hole 165 A connection hole 166 for moving the adjustment dial 140 inserted in the dial insertion hole 165 to the dial placement hole 161 may be provided between the holes 165.

At this time, the inner diameter 172 of the dial insertion hole 165 is larger than the body portion 148 of the adjustment dial 140, and the width 171 of the connection hole is larger than the neck portion 146 of the adjustment dial 140 And is smaller than the outer periphery of the body portion 148 of the adjustment dial 140. [

The adjustment dial 140 positioned in the dial placement hole 161 is moved toward the dial insertion hole 165 at a portion where the dial placement hole 161 of the dial support member 160 meets the connection hole 166 A locking protrusion 167 may be provided.

The trip mechanism 100 in which the adjustment dial 140 according to the embodiment of the present invention described above is disposed can prevent the flow of the adjustment dial 140 by arranging the elastic arm 164 in the adjustment dial support member 160. [ Can be prevented by the resilient support of the resilient arm 164 and the set interval between the operation portion 120a and the to-be-operated portion 130a can be prevented from being deviated.

Since the elastic arms 164 disposed on the dial supporting member 160 of the adjusting dial 140 are formed with the cutouts 162 and 163 and the elastic arms 164 can spread apart from each other, The rotation of the adjustment dial 140 is easy to prevent the insertion tool groove 142 from being deformed or damaged.

On the other hand, the trip mechanism 100 according to one embodiment of the present invention is installed inside the circuit breaker case for wiring. The components of the trip mechanism 100 can be mounted on a mounting frame or the like constituting the trip mechanism.

The operation of the trip mechanism 100 according to one embodiment of the present invention will now be described. When an overcurrent flows inside the circuit breaker, heat is generated in the heater (110). The generated heat is conducted to the bimetal 120 and the bimetal 120 is bent forward by the different thermal expansion coefficients of the two members constituting the bimetal 120. When the bimetal 120 is bent, the operating force of the operating portion 120a is transmitted to the to-be-operated portion 130a, and the trip sharp 130 is rotated. At this time, the opening / closing mechanism (not shown) is operated by the trip shaft 130 to the trip position.

It will be apparent to those skilled in the art that various modifications may be made without departing from the scope of the invention. Therefore, the scope of protection of this invention shall be determined by the description of the utility model claim scope and its equivalent scope.

100: trip mechanism
110: heater
120: Bimetal
120a:
130: Trip shaft
130a:
140: Adjustment dial
142: Insert tool groove
144:
146: neck part
148: Body part
150: motion direction changing means
152: eccentric rod
154: Fork
152: Adjustable member
160: Adjustment dial support member
161: Dial placement hole
162: First incision section
163: second incision section
164: elastic arm
165: Dial insertion hole
166: Connection hole
167:
171: Connection hole width
172: Inner insertion hole

Claims (5)

A bimetal that is bent forward by heat and has an operating portion at a free end;
And a trip shaft having a to-be-operated portion that is rotatably and horizontally movable forward of the bimetal and is operated to receive a rotational operation force from the operation portion and operates when the bimetal is bent when the bimetal is bent, ,
Wherein one of the operating portion and the to-be-operated portion is formed such that a height of a portion that is in contact with another one of the operating portion and the to-
The distance between the operating portion and the to-be-operated portion is adjusted by a trip adjusting unit that moves the trip shaft to the right and left,
The trip adjustment unit includes:
An adjustment dial having a neck portion;
A dial supporting member having a pair of resilient arms which are paired with each other to allow rotation of the adjusting dial to elastically grip the neck portion from both sides;
And a motion direction converting means for converting the rotational motion of the adjusting dial into a linear motion and transmitting the rectilinear motion to the trip shaft.
Tripping mechanism of circuit breaker. The method according to claim 1,
The dial support member includes a dial placement hole having the neck portion and a size smaller than the neck portion, a first incision portion located on one side of the dial placement hole, a second incision portion between the first incision portion and the dial placement hole A second cutout portion that allows the first cutout portion and the dial placement hole to communicate with each other is provided,
And a pair of elastic arms provided between the dial arrangement hole and the first incision,
Tripping mechanism of circuit breaker. The method of claim 2,
The dial support member is provided with a dial insertion hole into which the adjustment dial is inserted and which is located on the other side around the dial placement hole,
Wherein a dial hole is provided between the dial placement hole and the dial insertion hole, and a connection hole is formed in the dial insertion hole,
Tripping mechanism of circuit breaker. The method of claim 3,
And a locking protrusion provided at a portion where the dial arrangement hole and the connection hole meet to prevent the adjustment dial positioned in the dial arrangement hole from moving toward the dial insertion hole,
Tripping mechanism of circuit breaker. The method according to claim 3 or 4,
Wherein the adjusting dial has a head part and a body part connected to each other via the neck part, wherein the head part and the body part are larger in size than the neck part,
Wherein the dial insertion hole is larger in size than the body portion,
The width of the connection hole is larger than that of the neck portion, and is smaller than that of the neck portion,
Tripping mechanism of circuit breaker.

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