KR101052634B1 - Switchgear of small circuit breaker - Google Patents

Abstract

The present invention is to provide an opening and closing mechanism of a small circuit breaker that can increase the opening distance, the handle according to the present invention; Power transmission levers; A latch that rotates by power transmitted through the power transmission lever; A fixed contactor connected to a power supply or a load of the circuit; A movable contact that is rotatable to a position contacting the fixed contactor or to a position separate from the fixed contactor to open and close a circuit, the movable contact having an end connected to the latch; Has one end connected to the movable contactor and the other end fixed to the small wiring breaker,

In the closing operation in which the movable contactor makes contact with the fixed contactor, an elastic force is applied to the movable contactor as the pressure contacting the fixed contactor,

A spring for applying an elastic force in a direction to be separated from the fixed contact when the movable contact is separated from the fixed contact; And

An opening and closing mechanism of a small mold case circuit breaker is provided, including; a fixed shaft which contacts a outer surface of the movable contactor to provide a rotation support point when the movable contactor rotates to open and close a circuit.

Small wiring breaker, switchgear

Description

Switchgear of small circuit breaker {SWITCHING MECHANISM FOR SMALL MOLD CASED CIRCUIT BREAKER}

The present invention relates to a small circuit breaker, and more particularly, to an opening and closing mechanism of a small circuit breaker.

Small wiring breakers are power devices used to open and close small loads such as machine tools in homes, buildings, and factories, and to protect circuits from accidental currents such as overcurrent and short-circuit current.

Usually, a large number of small circuit breakers are installed in a distribution panel, and because a large quantity is used, it is a power device requiring manufacturing cost and assembly productivity. Therefore, the development of the small size and simple structure of the opening and closing mechanism and arc extinguishing mechanism is essential for the development of the small circuit breaker.

In addition, in the opening and closing mechanism of a small circuit breaker, the opening and closing mechanism having a high rated current characteristic due to the large opening distance, that is, the moving contact is separated from the fixed contact during breaking (trip) operation, is excellent. Is required.

However, the opening and closing mechanism of the circuit breaker for the small wiring according to the prior art has a problem that the spring is large and three springs are used, such as the main spring, the trip spring, and the contact spring, and have a complicated assembly structure. .

Therefore, the present invention solves the problems of the prior art, the object of the present invention is the small size and simple structure required for the opening and closing mechanism of the small circuit breaker, the opening and closing mechanism of the small wiring breaker excellent in breaking performance because of the large opening distance To provide.

The object of the present invention, in the opening and closing mechanism of the small mold case circuit breaker,

A handle providing a means for manual opening and closing operation;

A power transmission lever having one end connected to the handle;

A latch connected to the other end of the power transmission lever, the latch rotating by power transmitted through the power transmission lever;

A fixed contactor connected to a power supply or a load of the circuit;

A plurality of contacts which are rotatable to a position contacting the fixed contactor to open and close a circuit or to a position separate from the fixed contactor, having one end connected to the latch to rotate in the same direction as the latch, A movable contact having a contact surface;

It has one end connected to the movable contact and the other end fixed to the mold case,

In the closing operation in which the movable contactor makes contact with the fixed contactor, an elastic force is applied to the movable contactor as the pressure contacting the fixed contactor,

A spring for imposing an elastic force in a direction of separation from the fixed contact when the movable contact is separated from the fixed contact; And

It can be achieved by providing an opening and closing mechanism of the small mold case circuit breaker according to the present invention including a fixed shaft for contacting the outer surface of the movable contact for providing a rotation support point when the movable contact of the movable contact for the opening and closing of the circuit. .

The opening and closing mechanism of the small mold case circuit breaker according to the present invention includes only one spring, and during the circuit closing operation, the spring acts to increase the contact pressure between the movable contact and the fixed contact, and the circuit breaker ( During the cicuit opening operation, the spring acts to accelerate the disconnection speed of the movable contact, thereby simplifying components and improving assembly productivity.

The opening and closing mechanism of the small mold case circuit breaker according to the present invention includes a fixed shaft for providing a rotation support point to the movable contactor, and the movable contactor has a plurality of contact surfaces which contact the fixed shaft during rotation, As the rotation angle of the movable contactor is increased, the breaking performance is improved by increasing the opening distance between the movable contactor and the fixed contactor.

The opening and closing mechanism of the small mold case circuit breaker according to the present invention includes a fixed shaft for providing a rotational support point to the movable contactor, the movable contactor contacting the fixed shaft at a position in contact with the fixed contactor and the fixed contactor. Has a second surface in contact with the fixed shaft at a position to rotate away from the first surface, the first surface is configured with an inclined surface and the second surface of the movable contact is configured with an arc surface to rotate the movable contact in the circuit breaking operation. As the angle is increased, the opening distance between the movable contactor and the fixed contactor is increased, thereby improving the breaking performance.

The opening and closing mechanism of the small mold case circuit breaker according to the present invention includes a fixed shaft for providing a rotational support point to the movable contactor, the movable contactor contacting the fixed shaft at a position in contact with the fixed contactor and the fixed contactor. Has a second face in contact with the fixed shaft at a position to rotate away from the first face, the first face being comprised of an arc surface with a predetermined first radius of curvature and the second face of the movable contact being greater than the first radius of curvature. Since it consists of a small 2nd circular arc surface, the breakdown performance can be improved by increasing the opening distance between a movable contact and a fixed contact by increasing the rotation angle of a movable contact at the time of a circuit interruption operation.

The opening and closing mechanism of the small mold case circuit breaker according to the present invention has the effect of reducing the manufacturing cost by constructing a contact support portion constituting a movable contactor and an integral member made of a single material of iron or copper. You can get it.

The object of the present invention and the constitution and effects of the present invention to achieve the same will be more clearly understood by the following detailed description of the preferred embodiment of the present invention with reference to the accompanying drawings.

In the opening and closing mechanism of the small mold case circuit breaker according to the present invention, which is a longitudinal cross-sectional view of the small mold case circuit breaker according to the present invention showing when the trip lever is removed and the circuit opening state is removed for clarity. It demonstrates with reference to FIG.

The opening and closing mechanism of the small mold case circuit breaker according to the present invention includes a handle 21, a power transmission lever 22, a latch 23, a fixed contactor 29, and a movable contactor 27. , A spring 26 and a fixed shaft 25 is configured.

The handle 21 provides a means for manual opening and closing of the small mold case circuit breaker. That is, the user grips the handle 21 and operates it in an on or off position, whereby the small mold case circuit breaker connects a circuit from a power supply to a load side to an on position where current can flow. Alternatively, the circuit from the power supply to the load side can be cut off to operate in the off position where no current can flow. The handle 21 is provided with a bearing portion connected to a support shaft portion integrally formed at the upper end of the mold case 40 to be described later, and is rotatably supported by being fitted with the support shaft portion at the bearing portion. A handle operating tool is provided on the upper surface of the mold case 40 to allow operation of the handle 21 to the on position or the off position, and the handle 21 can be operated to the on or off position within the range of the handle operating tool. Do.

One end of the power transmission lever 22 is connected to the handle 21 to transmit the manual force transmitted by the user through the handle 21 to the components of the other opening mechanism, or to transmit the power from the components of the other opening mechanism. 21) to pass. The power transmission lever 22 is a letter member of the letter “M”, which is roughly inserted into the lever connection port provided in the handle 21 and the latch 23, respectively, with both legs corresponding to the one end and the other end. The drive 21 is driven to the handle 21 and the latch 23.

The latch 23 is connected to the other end of the power transmission lever 22 and rotates by the power transmitted through the power transmission lever 22. A more detailed shape connection configuration of the latch 23 will be described later with reference to FIGS. 6 and 9.

The fixed contactor 29 is connected to the power supply or load side of the circuit (power circuit), and has a contact 29a at its end. The movable contactor 27 is electrically connected to the load side of the circuit when the fixed contactor 29 is electrically connected to the power supply side of the circuit, and the movable contactor 27 is electrically connected to the load side of the circuit. ) Is electrically connected to the power supply side of the circuit. The fixed contact 29 has a contact 29a as can refer to FIG. 1.

The movable contactor 27 is rotatable to a position in contact with the fixed contactor 29 or to be separated from the fixed contactor 29 to open and close the circuit. The movable contact 27 has one end connected to the latch 23 so as to rotate in the same direction as the latch 23, and has a plurality of contact surfaces in contact with the rotation support point. Here, the rotation support point may be interpreted to mean the fixed shaft 25. The movable contact 27 has a contact 27b-1 as can refer to FIG.

The spring 26 has one end connected to the movable contact 27 and the other end fixed to the mold case 40. Herein, the mold case 40 means that the molded case is manufactured by molding an electrical insulating material to provide an enclosure of a small circuit breaker called a circuit breaker or a circuit breaker. The mold case 40 houses the components of the circuit breaker, that is, the opening and closing mechanism, the tripping mechanism, the arc extinguishing mechanism, etc. as an enclosure of the circuit breaker. The spring 26 imparts an elastic force to the movable contactor 27 as a pressure to contact the fixed contactor 29 when the movable contactor 27 contacts the fixed contactor 29. In addition, the spring 26 imparts an elastic force to the movable contactor 27 in a direction in which the movable contactor 27 is separated from the fixed contactor 29 in the blocking operation in which the movable contactor 27 is separated from the fixed contactor.

The fixed shaft 25 contacts the outer surface of the movable contactor 27 to provide a rotation support point when the movable contactor 27 rotates for opening and closing the circuit. The fixed shaft 25 is located adjacent to the portion of the movable contactor 27 connected to one end of the spring 26. The fixed shaft 25 may be configured as a separate metal shaft fixed to the mold case 40 or may be configured as an axial protrusion formed integrally with the mold case 40.

In FIG. 1, reference numeral 40a designates a position where the arc extruding mechanism mounting portion, that is, the arc extruding mechanism (see numeral 33 in FIG. 7), is installed in the mold case 40, and reference numeral 40b designates a trip mechanism in the mold case 40. Part, that is, a seat to which a trip mechanism that can refer to FIGS. 7 and 8 is instructed, and 40c1. 40c2 indicates the terminal mounting portion where the power supply side and load side terminals are to be installed, respectively.

Reference numeral 24 denotes a trip lever, which is a component that is pressurized by a trip mechanism included in a small mold case circuit breaker and is rotatable and connected by a shaft to the latch 23. A more detailed configuration of the trip lever 24 will be described later in more detail with reference to FIG. 6.

Numeral 30 is connected to the latch 23 with the movable contactor 27 as a shaft, and has a bearing for fitting the fixed shaft 25 to rotate about the fixed shaft 25 in the same direction as the latch 23. Indicate a movable contactor cover. More detailed shapes, configurations, and connection relationships of the movable contact cover 30 will be described later with reference to FIGS. 6 and 9.

On the other hand, Figure 3 is a perspective view showing a characteristic configuration of the movable contactor in the opening and closing mechanism of the small mold case circuit breaker according to the present invention, and the first embodiment of the movable contactor in the opening and closing mechanism of the small mold case circuit breaker according to the present invention 4 is a partially enlarged explanatory diagram showing the configuration and FIG. 5 is a partially enlarged explanatory diagram showing the configuration according to the second embodiment of the movable contact in the opening and closing mechanism of the small mold case circuit breaker according to the present invention.

According to a preferred characteristic configuration of the present invention as described above, the movable contactor 27 has a plurality of contact surfaces as the outer surface contacting the rotational support point, that is, the fixed shaft (see reference numeral 25 in FIG. 1). Here, according to a preferred embodiment, the plurality of contact surfaces of the movable contactor 27 may be composed of a plurality of surfaces having different curvature radii. 3, according to an embodiment, reference may be made to part A of FIG. 3, wherein the plurality of contact surfaces of the movable contactor 27 are positioned on the fixed shaft (see reference numeral 25 of FIG. 1) at a position in contact with the fixed contactor. It may comprise a first surface in contact with and a second surface in contact with the fixed shaft in a rotated position separated from the fixed contact.

Here, according to the first preferred embodiment, the first surface of the movable contact 27 is constituted by the inclined surface 27a-3, as shown in FIG. 4, and the second surface of the movable contact 27 is It may be composed of an arc surface (27a-4).

Here, according to a second preferred embodiment, the first surface of the movable contact 27 is composed of a first circular arc surface 27a'-3 having a first radius of curvature, as shown in FIG. 5. And, the second surface of the movable contact 27 may be composed of a second arc surface (27a '-4) smaller than the first radius of curvature.

In addition, the movable contactor 27 may be configured to include a contactor portion 27b having a contact with the contactor support portion 27a as shown in FIG. 3. According to one embodiment, the contact support portion 27a is a member made of iron, and the contact portion 27b may be made of a member made of different materials as a member made of copper. According to another embodiment, the contact support portion 27a and the contact portion 27b may be composed of an integrally formed member made of a single material of iron or copper.

In FIG. 3, reference numeral 27a-1 indicates the shaft hole portion 27a-1 into which the contact connecting shaft portion (see reference numeral 23a in FIG. 7) of the latch 23 described later is inserted. In FIG. 3, reference numeral 27a-2 indicates a spring hook portion that supports the end of the spring (see reference numeral 26 in FIG. 1). The through-ring hanger 27a-2 is preferably formed in a hook shape.

On the other hand, with reference to Figures 6 and 9 will be described the relative position, shape and assembly method of the opening and closing mechanism of the small mold case circuit breaker according to the present invention.

Since the movable contact 27 has been described in detail with reference to FIG. 3, a description of the configuration of the overlapped movable contact 27 will be omitted.

The movable contact cover 30 is a constituent member having a U-shaped cross-sectional shape by connecting a pair of plate members having an alphabet "V" shape from the rear side. The movable contact cover 30 includes a pair of latch connection shaft holes 30a provided through the upper ends of the pair of plate members, and a pair of fixed shaft water holes provided through the center portions of the pair of plate members. And a trip lever connection hole 30c provided through the portion 30b and the lower end portion of the pair of plate members.

The latch 23 is a constituent member having an elliptical body portion, a contact connecting shaft portion 23a and a power transmission lever connecting tube portion 23b formed to protrude from the body portion toward the front and the rear side, respectively.

The trip lever 24 is a constituent member having one side of the arc shape and the other side of the plane shape having a protrusion. The trip lever 24 is a top end portion 24a protruding in a curved shape as an upper end portion of one side of the arc shape, and a movable contact cover connecting protrusion portion at an upper position of the front surface (left side in view) as shown in FIG. 24b), a trip actuation force acting portion 24c for receiving power for a trip (circuit breaking) from a trip mechanism 32 provided to the side at the lower end and referring to FIG. A trip lever cover connecting tube portion 24d to allow the trip lever cover 31 to be connected as can be referred to the rear view part of the trip lever 24 in FIG. 9. do.

9, the opening and closing mechanism of the small mold case circuit breaker according to the present invention may further include a trip lever cover 31. The trip lever cover 31 includes an elliptical body portion, a cover extension portion 31c provided to protrude laterally from the body portion, and a cover groove portion 31a formed in a front-rear direction at one position of the body portion. And a lever connecting protrusion 31b formed to protrude forward (right in FIG. 9) from the body portion.

Here, the cover groove portion 31a is a movable contact cover connecting protrusion of the trip lever 24 extending through the trip lever connecting hole (see numeral 30c in FIG. 6) of the movable contact cover 30 (symbol of FIG. 6). As shown in the rightmost view of FIG. 9 as the recessed portion for fitting the end portion of the cover portion 24b, the rear portion of the cover recessed portion 31a is blocked. Thus, the free end of the movable contact cover connecting protrusion (see symbol 24b in Fig. 6) of the trip lever 24 is fitted into the cover recess 31a having the blocked rear portion of the trip lever cover 31, thereby connecting it. Assembled state of the movable contact cover 30 and the trip lever 24 can be maintained.

As shown in FIG. 9, the lever connecting protrusion 31b is fitted to the trip lever cover connecting pipe portion 24d provided on the rear side of the trip lever 24 so that the lever lever 24 and the trip lever cover 31 are fitted. ) Are combined.

9, the end portion of the cover extension portion 31c of the trip lever cover 31 is the latch connection shaft hole portion of the movable contact cover 30 (see numeral 30a in FIG. 6). The latch 23 which is in close contact with the upper surface of the movable contactor cover 30 adjacent to and adjacent to the latch connection shaft hole (see reference numeral 30a in FIG. 6) and the shaft hole 27a-1 of the movable contactor 27. It is located in close contact with the end portion of the contact connecting shaft portion 23a. It has elastic force so as to keep in close contact with the connecting portion of the movable contactor 27 and the movable contactor cover 30 and the latch 23. According to a preferred embodiment, the cover extension 31c is a member of a tortuous shape. Can be configured. For this function, the trip lever cover 31 can be made by casting a synthetic resin material. Therefore, by the cover extension part 31c, the connection state (assembly state) of the movable contactor 27, the movable contactor cover 30, and the latch 23 can be maintained.

Meanwhile, a method of assembling the opening and closing mechanism of the small mold case circuit breaker according to the present invention will be described.

First, the movable contact cover 30 surrounds the upper portion of the movable contactor 27 such that the upper portion of the movable contactor 27, that is, the contactor support portion 27a, is positioned between the two plate portions of the movable contactor cover 30. Install it. At this time, the shaft hole portion 27a-1 of the movable contactor 27 and the latch connection shaft hole portion 30a of the movable contactor cover 30 are aligned to communicate with each other for the subsequent process.

Next, the contactor connecting shaft portion 23a of the latch 23 is moved to the shaft contact portion 27a-1 of the movable contactor 27 and the latch connecting shaft hole portion 30a of the movable contactor cover 30. Into the latch connection shaft hole portion 30a of the shaft contact portion 27a-1 and the movable contactor cover 30 to form an intermediate assembly of the movable contactor 27, the movable contactor cover 30, and the latch 23. do.

Next, the movable contact cover connecting protrusion 24b of the trip lever 24 is inserted into the trip lever connecting hole 30c of the movable contactor cover 30 so as to pass through the trip lever connecting hole 30c of the movable contactor cover 30. Insertion results in an assembly with trip lever 24 attached to the intermediate assembly.

Next, the trip lever cover 31 is assembled. That is, the free end of the movable contact cover connecting protrusion (see symbol 24b in FIG. 6) of the trip lever 24 is fitted to the cover recess 31a of the trip lever cover 31, and the lever connecting protrusion 31b 9, the trip lever 24 and the trip lever cover 31 are coupled to the trip lever cover connecting tube part 24d provided on the rear of the trip lever 24, and the cover extension part is provided. The end of the 31c is in close contact with the upper surface of the movable contact cover 30 adjacent to the latch connection shaft hole portion (see reference numeral 30a in FIG. 6) of the movable contact cover 30, and at the same time, the latch connection shaft hole portion (FIG. 6). Reference numeral 30a) and the contact hole 23a of the latch 23 penetrating the shaft hole portion 27a-1 of the movable contactor 27. Thereby, the assembly of the movable contactor 270, the movable contactor cover 30, the latch 23, the trip lever 24, and the trip lever cover 31 is obtained.

Next, by assembling the spring, the power transmission lever and the handle included in the opening and closing mechanism of the small mold case circuit breaker according to the present invention, it is possible to obtain the opening and closing mechanism of the small mold case circuit breaker according to the present invention. The explanation is as follows.

The handle 21 has a bearing part connected to a support shaft part integrally formed at the upper end of the mold case 40 and is installed to be rotatably supported by inserting the support shaft part in the bearing part.

The handle 21 has one lever connecting portion that allows the leg portion of the power transmission lever 22 which is not given a sign to one position to be connected.

Therefore, one leg of the pair of legs of the power transmission lever 22 is inserted into and connected to the lever connecting port of the handle 21, and the other leg of the power transmission lever 22 is the power of the latch 23. It inserts into the transmission lever connection pipe part (refer to the code | symbol 23b of FIG. 6), and connects the handle 21, the power transmission lever 22, and the latch 23 so that they may mutually cooperate.

Next, one end of the spring 26 is connected to the spring hook portion (see reference numeral 27a-2 in FIG. 6) of the movable contactor 27, and the other end of the spring 26 is a mold case 40. It is installed by hanging on the spring supporting protrusion (unsigned) which is fixedly provided to protrude in the. This completes the assembly of the opening and closing mechanism of the mold case circuit breaker according to the present invention.

Meanwhile, the operation of the opening and closing mechanism of the small mold case circuit breaker according to the present invention will be described with reference to FIGS. 1 to 3 and 6 to 8.

First, in the disconnected state illustrated in FIG. 1, that is, the movable contactor and the fixed contactor are separated from each other in a circuit opened position, the ON state as shown in FIG. First, the operation of the circuit in a closed position due to the contact between the contactor and the fixed contact will be described.

When the user grips the handle 21 in the state of FIG. 1 and manipulates it to the on position on the right side of the drawing, the manual manipulation force of the user is transmitted to the latch 23 through the power transmission lever 22. That is, as the connecting portion of the power transmission lever 22 of the handle 21 rotates clockwise (moves downward to the right side in FIG. 1) with the right movement of the handle 21, the power transmission lever 22 also moves to the lower right side. Go to. Therefore, the latch 23 connected to the power transmission lever 22 also moves to the lower right side. As the latch 23 moves downward to the right, the movable contactor 27 and the movable contactor cover 30 connected to the latch 23 also try to move downward. However, since the movable contact cover 30 is axially connected only by the fixed shaft 25 so as to be rotatable, the movable contact cover 30 rotates clockwise in place. At this time, the movable contact 27 has a second surface, that is, the first surface from the state in which the circular arc surface 27a-4 in FIG. 5 or the second circular arc surface 27a'-4 in FIG. 6 contacts the fixed shaft 25. That is, the inclined surface 27a-3 in FIG. 5 or the first circular arc surface 27a'-3 in FIG. 6 rotates in the clockwise direction with the rotation center in the state in contact with the fixed shaft 25. . In particular, the first circular arc surface 27a'-3 or the inclined surface 27a having a large radius of curvature from the state in which the fixed axis 25 has a small radius of curvature contacting the second circular arc surface 27a'-4. In contact with -3), the movable contactor 27 rotates clockwise in FIGS. 2 and 3, wherein the spring 26 is in a direction in which the movable contactor 27 contacts the stationary contactor 29. By applying an elastic force, the movable contactor 27 rotates to contact the fixed contactor 29 more quickly. After the movable contactor 27 is in contact with the fixed contactor 29, the elastic force of the spring 26 acts as a contact pressure to ensure that the movable contactor 27 and the fixed contactor 29 are in contact with each other.

Next, from the on state shown in Figs. 2 and 8, in other words, the movable contactor and the fixed contact are in contact with each other so that the circuit is closed (circuit closed position). In other words, the movable contact and the fixed contact are separated to explain the operation in the circuit opened position.

In FIG. 8, a movable core of a trip mechanism including a coil electrically connected to a circuit and a movable core movable by an electromagnetic force of the coil when an abnormal current such as a short circuit current in the circuit is energized. The side action end moves to the right in the drawing. As a result, the actuating end of the movable core moving to the right pushes the trip actuation force acting portion 24c of the trip lever 24, and thus the trip lever 24 rotates counterclockwise, thereby bringing the state as shown in FIG. . Counterclockwise rotation of the trip lever 24 causes counterclockwise rotation of the movable contactor cover 30 connected by the movable contactor cover connecting protrusion 24b, and the movable contactor cover 30 and the contactor connecting shaft portion 23a. The movable contact 27 and the latch 23 connected by (see FIG. 6) also rotate counterclockwise. At this time, the movable contact 27 is formed from the first surface, that is, the second surface from the state in which the inclined surface 27a-3 of FIG. 5 or the first circular arc surface 27a'-3 of FIG. 6 contacts the fixed shaft 25. In FIG. 5, the fixed shaft 25 is rotated counterclockwise with the rotational center in a state in which the circular arc surface 27a-4 or the second circular arc surface 27a '-4 in FIG. 6 is in contact with the fixed shaft 25. . In particular, the second circular arc surface 27a'-4 with the small radius of curvature is fixed from the state where the first circular arc surface 27a'-3 with the large radius of curvature or the inclined surface 27a-3 contacts the fixed shaft 25. As the shaft 25 comes into contact, the movable contactor 27 rotates at a larger angle clockwise in FIGS. 1 and 2, that is, a distance at which the movable contactor 27 is separated from the fixed contactor 27. Rotates greatly. At this time, the spring 26 is applied to the elastic force in the direction in which the movable contactor 27 is separated from the fixed contactor 29, so that the movable contactor 27 is rotated so as to be separated more quickly from the fixed contactor 29 and the movable contactor 27 The elastic force of the spring 26 acts as a biasing force to keep the movable contactor 27 separated from the stationary contactor 29 after) is separated from the stationary contactor 29.

As described above, the opening and closing mechanism of the small mold case circuit breaker according to the present invention includes only one spring, and the spring acts to increase the contact pressure between the movable contact and the fixed contact during the circuit closing operation. In the case of a circuit opening operation, the spring acts to accelerate the disconnection speed of the movable contact, thereby simplifying components and improving assembly productivity.

The opening and closing mechanism of the small mold case circuit breaker according to the present invention includes a fixed shaft for providing a rotation support point to the movable contactor, and the movable contactor has a plurality of contact surfaces which contact the fixed shaft during rotation, As the rotation angle of the movable contactor is increased, the breaking performance is improved by increasing the opening distance between the movable contactor and the fixed contactor.

Figure 1 is a small mold case circuit breaker according to the present invention showing the opening and closing mechanism of the small mold case circuit breaker according to the present invention, when the tripping lever is removed, for the sake of understanding. It is a bell cross section,

Figure 2 is a small mold case circuit breaker according to the present invention in the opening and closing mechanism of the small mold case circuit breaker according to the present invention, when the trip lever is removed, the circuit closing state in a state of closing the circuit (circuit closing) It is a bell section,

Figure 3 is a perspective view showing the characteristic configuration of the movable contact of the opening and closing mechanism of the small mold case circuit breaker according to the present invention,

FIG. 4 is an enlarged explanatory view of part 3 of the double-dotted chain line in FIG. 3 showing the configuration according to the first embodiment of the movable contactor in the opening and closing mechanism of the small mold case circuit breaker according to the present invention; FIG.

FIG. 5 is an enlarged explanatory diagram of a portion of the double-dotted chain line A in FIG. 3 showing the configuration according to the second embodiment of the movable contact in the opening and closing mechanism of the small mold case circuit breaker according to the present invention;

Figure 6 is an exploded perspective view showing the relative position, shape and assembly position of the movable contactor, the movable contactor cover, the latch, the trip lever of the opening and closing mechanism of the small mold case circuit breaker according to the present invention,

7 is a longitudinal cross-sectional view of a state in which a tripping mechanism is shown as a longitudinal cross-sectional view of a small mold case circuit breaker according to the present invention showing when the opening and closing mechanism of the small mold case circuit breaker according to the present invention is in a blocking operation state;

8 is a longitudinal cross-sectional view of a small mold case circuit breaker according to the present invention showing a time when the opening and closing mechanism of the small mold case circuit breaker according to the present invention is in the closing operation state,

9 is a component assembly process diagram showing the shape and the step-by-step assembly process of the components of the opening and closing mechanism of the small mold case circuit breaker according to the present invention.

* Explanation of symbols on the main parts of the drawings

21: handle 22: power transmission lever

23: latch 23a: contact connecting shaft portion

23b: power transmission lever connector

24: trip lever 24a: upper projection

24b: movable contact cover connection protrusion 24c: tripping force acting portion

24d: Trip lever cover connection part

25: fixed shaft 26: spring

27: movable contactor 27a: contact support part

27a-1: shaft work

27a-2: spring hook portion 27a-3: inclined surface

27a-4: arc surface

27a'-3: first arc surface 27a'-4: second arc surface

27b: Contact portion 27b-1: Contact
29a: contact 29: fixed contactor

30: movable contact cover 30a: latch connection shaft portion

30b: fixed shaft hole 30c: trip lever connection hole

31: trip lever cover 31a: cover recess portion

31b: lever connection protrusion 31c: cover extension

32: trip mechanism 33: SOHO mechanism

40: mold case 40a: SOHO mounting portion

40b: trip mechanism mounting section 40c1, 40c2: terminal mounting section

Claims (11)

In the opening and closing mechanism of the small mold case circuit breaker, A handle providing a means for manual opening and closing operation; A power transmission lever having one end connected to the handle; A latch connected to the other end of the power transmission lever and rotating by power transmitted through the power transmission lever; A fixed contactor connected to a power supply or a load of the circuit; A plurality of contacts rotatably moved to a position contacting the fixed contactor to open and close a circuit, and having one end connected to the latch to rotate in the same direction as the latch and having contact with the rotation support point A movable contact having a contact surface; It has one end connected to the movable contact and the other end fixed to the mold case, In the closing operation in which the movable contactor makes contact with the fixed contactor, an elastic force is applied to the movable contactor as the pressure contacting the fixed contactor, A spring for imposing an elastic force in a direction of separation from the fixed contact when the movable contact is separated from the fixed contact; And And a fixed shaft for contacting an outer surface of the movable contactor to provide a rotation support point when the movable contactor rotates for circuit opening and closing. The fixed shaft is located adjacent to a portion of the movable contact connected to one end of the spring, The movable contact, A first surface in contact with the fixed shaft at a position in contact with the fixed contact; And And a second surface contacting the fixed shaft at a position separated from the fixed contactor, the opening and closing mechanism of the small mold case circuit breaker. The method of claim 1, And a plurality of contact surfaces of the movable contact are composed of a plurality of surfaces having different curvature radii. delete The method of claim 1, The first surface of the movable contact is composed of an inclined surface, The opening and closing mechanism of the small mold case circuit breaker, characterized in that the second surface of the movable contact is composed of an arc surface. The method of claim 1, The first surface of the movable contact is composed of a circular arc surface having a predetermined first radius of curvature, The opening and closing mechanism of the small mold case circuit breaker, characterized in that the second surface of the movable contact is composed of a second arc surface smaller than the first radius of curvature. The method of claim 1, The movable contact, Contact support portion; And Contactor portion having a contact; the opening and closing mechanism of the small mold case circuit breaker comprising a. The method of claim 6, The contact support portion is a member made of iron, the contact portion of the small mold case circuit breaker opening and closing mechanism, characterized in that the member made of copper. The method of claim 6, The contact support portion and the contact portion opening and closing mechanism of the small mold case circuit breaker, characterized in that the integrally formed member made of a single material of iron or copper. The method of claim 1, A movable contactor cover axially connected to the latch together with the movable contactor, the bearing having a fixed shaft to which the fixed shaft is fitted, and rotatable about the fixed shaft in the same direction as the latch; And A small mold further comprising a trip lever pressurized by a trip mechanism included in the small mold case circuit breaker and having a connection protrusion connected to the movable contact cover; Switchgear of case circuit breaker. 10. The method of claim 9, Body, A recess provided in the body and for fitting a free end of the connection protrusion of the trip lever; A trip lever further includes a cover extension part extending from the body part to the contact portion of the movable contactor, the movable contactor cover and the latch so as to maintain a connection state between the movable contactor, the movable contactor cover and the latch. Opening and closing mechanism of a small molded case circuit breaker comprising. The method of claim 10, Cover extension of the trip lever, An opening / closing mechanism of a compact molded case circuit breaker, characterized by comprising a member of a serpentine shape having an elastic force to maintain a state of being in close contact with the movable contactor, the movable contactor cover, and the connecting portion of the latch.

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