KR200224237Y1 - structure for operating trip button in molded case circuit breaker - Google Patents

Abstract

The present invention breaks away the trip button operation structure of the circuit breaker from the conventional pressing method, so that the trip operation occurs automatically when the auxiliary cover is opened or when the trip button is removed from the cover, thereby improving the safety of the breaker. It is.

To this end, the present invention is installed on the trip button (3) that is installed to be lowered in the installation hole (2) of the breaker cover (1), and on the outer peripheral surface of the shaft portion of the trip button to give a restoring force to the trip button when the trip button is lowered Compression spring (4), the auxiliary cover (5) installed on the cover (1) to expose the head portion of the trip button, and the hinge shaft (6a) as the bevel (7a) is pressed when the trip button is lowered The nail 7 coupled to the front end of the side plate 8 so as to rotate about the center, and the latch holder 9 rotatably coupled to the side plate one side hinge shaft 6b when the nail is rotated. In the wiring breaker provided with a latch (10) to trip the breaker by interlocking; As the auxiliary cover 5 is closed, the compression spring 4 installed on the trip button 3 is compressed and the pressing protrusion 11 formed at the bottom of the button is positioned below the slanted surface 7a of the nail 7. While being restrained, as the auxiliary cover 5 is removed, the trip button is raised by the restoring force of the compression spring 4, and the pressing protrusion 11 presses the comb surface 7a of the nail 7 to the By rotating the nail, there is provided a trip button operating structure of the circuit breaker for interlocking the opening and closing mechanism so that the latch 10 is released from the latch holder 9.

Description

Structure for operating trip button in molded case circuit breaker

The present invention relates to a trip button operation structure of a circuit breaker, and more specifically, to trip the breaker automatically when opening the auxiliary cover by releasing the trip button operation structure from the conventional push method.

In general, wiring breakers are mainly installed in switchboards in factories, buildings, etc., and act as a switchgear that supplies or cuts power to the load side under no load condition. When a large current exceeding the load current flows in order to protect the electric wires of the converter and the load-side equipment, it serves as a circuit breaker that supplies or cuts off the power supplied from the power supply to the load.

Such wiring breakers are manufactured in various structures due to different frame sizes, number of poles, operation methods, etc., but are composed of a mold case, a contactor, a tripping device, an opening and closing mechanism, a protection device, and a terminal as basic elements.

The conventional circuit breaker configured as described above prevents breakage or fire of the wiring and the connected equipment by quickly disconnecting the circuit when an abnormality occurs in the circuit, and the operating characteristics of the circuit breaker are demonstration trip, pure seat lip, It is divided into three types of one sheet lip.

The operation characteristics of the circuit breaker described above will be briefly described as follows.

First of all, the demonstration trip will cause a fire if the electric wire is heated and left unattended if more than 125% of the rated current continuously flows for a certain time. Therefore, the circuit breaker shuts down the circuit before the temperature of the electric wire reaches a dangerous level. Say that.

In addition, the forward seat lip refers to interrupting the fault current by tripping the circuit breaker at the moment when a large fault current occurs momentarily due to a load line or a load abnormality.

Also, in case of single-circuit circuit breaker and branch circuit breaker in series, in case of an accident current in one branch circuit close to the load side, the circuit breaker of branch circuit is before the circuit breaker for trunk wiring. The circuit breaker delays the time that the circuit breaker for tripping trips, and this characteristic can be said to be a characteristic only for a circuit breaker capable of adjusting the net trip value.

1 is a perspective view illustrating a conventional circuit breaker, and FIG. 2 is an exploded perspective view of FIG. 1.

On the other hand, Figure 3 is an enlarged view of the opening and closing mechanism of Figure 2, Figures 4a and 4b is a schematic view for showing the operation structure of the trip button according to the present invention, with reference to these drawings the operation structure and operation of a conventional trip button The process is as follows.

If the breaker is to be tripped using the trip button 3 while the breaker is turned on by inserting the handle 15 for opening and closing, the head of the trip button 3 as indicated by the arrow in FIG. 4A. When the pressing force is applied, the trip button 3 provided through the installation hole 2 of the auxiliary cover 5 descends and presses the comb surface 7a of the nail 7 constituting the opening / closing mechanism.

Accordingly, the nail 7 hinged to the load side tip of the side plate 8 is rotated clockwise in the drawing about the hinge axis 6a, as shown in 4b.

At this time, the latch 10 held by the latch holder 9 is released by the restoring force of the main spring (not shown) to rotate the center of rotation 12 counterclockwise about the axis. By the interlocking action of the mechanism, the movable contactor 13 installed on the main shaft 16 is separated from the fixed contactor 14 to trip the breaker.

However, since the conventional circuit breaker causes a trip only when the trip button 3 is pressed, the trip button 3 is detached from the breaker cover 1 or caught in the nail 7 to cause a trip failure. There was a problem of lowering reliability and safety.

The present invention is to solve the above problems, to break the trip button operation structure of the circuit breaker from the conventional pressing method, so that the trip operation occurs automatically when opening the auxiliary cover or when the trip button is removed from the cover It is therefore an object of the present invention to provide a trip button operating structure of a circuit breaker that can improve the safety of the circuit breaker.

1 is a perspective view showing a conventional circuit breaker

2 is an exploded perspective view of FIG.

3 is an enlarged view of the opening and closing mechanism of FIG. 2;

4a and 4b is a schematic view showing the operation structure of the trip button according to the present invention,

4A is a state diagram before the trip button descends

4B is a state diagram after the trip button is lowered

5a and 5b is a schematic view for showing the operation structure of the trip button according to the present invention,

Figure 5a is a state in which the trip button is restrained by the auxiliary beaker

5B is a state diagram when the auxiliary cover is opened and the trip button is released from the restrained state;

Explanation of symbols for main parts of the drawings

1: cover 2: installer

3: Trip button 4: Compression spring

5: Auxiliary cover 6a, 6b: Hinge shaft

7: nail 7a: combed

8: side plate 9: latch holder

10: Latch 11: Pressure projection

12: center of rotation 13: movable contactor

In order to achieve the above object, the present invention is a trip button is installed in the installation hole of the breaker cover and the compression spring is installed on the outer peripheral surface of the shaft of the trip button to give a restoring force to the trip button when the trip button is lowered; An auxiliary cover installed on the upper part of the cover to expose the head of the trip button, a nail rotated around the hinge axis as the bevel is pressed when the trip button is lowered, and released from the latch holder when the nail is rotated to open and close the mechanism. A circuit breaker having a latch for tripping a circuit breaker by interlocking; As the auxiliary cover is closed, the compression spring installed on the outer circumferential surface of the trip button is compressed and the pressurization protrusion formed at the bottom of the trip button is constrained to be positioned below the comb surface of the nail, and the compression is performed as the auxiliary cover is removed. The tripping button operation of the circuit breaker is characterized in that the pressurizing protrusion of the trip button presses the inclined surface of the nail while rotating by the spring, thereby interlocking the opening / closing mechanism to release the latch from the latch holder. A structure is provided.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 5A and 5B.

5A is a state diagram in which the trip button is restrained by the auxiliary beaker, and FIG. 5B is a state diagram when the auxiliary cover is opened and the trip button is released from restraint state. FIGS. 5A and 5B are operation structures of the trip button according to the present invention. Schematic to show.

The present invention has a trip button (3) which is installed to be lowered in the installation hole (2) of the breaker cover (1), and the trip button (3) to give a restoring force to the trip button (3) when the trip button (3) is lowered. Compression spring (4) is installed on the outer peripheral surface of the shaft portion, the auxiliary cover (5) installed on the cover (1) so that the head of the trip button 3 is exposed, and the lower surface of the trip button (3) when descending ( As the 7a) is pressed, the nail 7 pivots about the hinge shaft 6a and the latch holder 9 is released when the nail 7 rotates to interlock the link mechanism to trip the breaker. A circuit breaker having a latch (10); As the auxiliary cover 5 is closed, the compression spring 4 installed on the outer circumferential surface of the trip button 3 is compressed, and at the same time, the pressing protrusion 11 formed at the bottom of the trip button has a lower side of the nail 7 of the nail 7. While the auxiliary cover 5 is constrained to be located at, the trip button is lifted by the restoring force of the compression spring 4, and the pressing protrusion 11 of the trip button is the slanted surface of the nail 7. By pressing 7a to rotate the nail 7, the opening and closing mechanism is interlocked so that the latch 10 is released from the latch holder 9.

The operation of the present invention configured as described above is as follows.

The circuit breaker of the present invention is in a state in which the head of the trip button 3 is pressed and restrained by the auxiliary cover 5 as shown in FIG. 5A when the auxiliary cover 5 is closed.

That is, in the state in which the auxiliary cover 5 is closed, the compression spring 4 installed on the shaft portion of the trip button 3 is compressed, and at the same time, the lower end portion having the pressing protrusion 11 of the trip button 3 is nailed. It is located in the lower part of the inclined surface 7a of (7).

As described above, when the auxiliary cover 5 is opened while the auxiliary cover 5 is closed, the pressing force applied to the head of the trip button 3 is removed as indicated by the arrow in FIG. 5A, and the installation hole 2 is removed. The trip button 3 is raised by the restoring force of the compression spring 4 compressed in the inside.

As a result, the pressing protrusion 11 of the rising trip button 3 rises while interfering with the intersecting surface 7a of the nail 7, thereby pushing up the nail 7 to rotate the nail 7.

At this time, the gradient of the inclined surface 7a formed on the nail 7 has an inverse gradient with the inclined surface 7a of the conventional nail 7, but the pressing direction of the trip button 3 is also changed in the opposite direction to the conventional one. Therefore, the rotational direction centering on the hinge axis 6a of the nail 7 maintains the same direction as in the prior art.

Therefore, in the circuit breaker of the present invention, when the auxiliary cover 5 is opened to attach or check an accessory, or when the cover 1 is removed to disassemble the circuit breaker, the circuit breaker is automatically operated without a separate operation for tripping the circuit breaker. As the circuit breaker trips to open the converter, it is possible to maximize safety and reliability of the circuit breaker by preventing safety accidents in advance.

As described above, the present invention is to escape from the method of manually pressing the trip button operation structure of the circuit breaker in the existing upper, when opening the auxiliary cover (5) or the trip button (3) cover (1) It is to make trip operation occur automatically when leaving.

Therefore, when the auxiliary cover is opened to install or inspect the accessory, or the cover is removed for disassembling the breaker, the breaker automatically trips to protect the load side while the operator The effect is to be safe.

Claims (1)

The trip button (3) is installed to be lowered in the installation hole of the breaker cover, the compression spring (4) is installed on the outer peripheral surface of the shaft button of the trip button to give a restoring force to the trip button when the trip button is lowered, and the trip button An auxiliary cover 5 installed at the top of the cover to expose the head part, a nail 7 coupled to the end of the side plate to rotate about a hinge axis as the bevel 7a is pressed when the trip button is lowered, and In the circuit breaker with a latch which is released from the latch holder (9) rotatably coupled to the side hinge shaft of the side plate when the nail is rotated to trip the breaker by interlocking the opening and closing mechanism: When the auxiliary cover 5 is opened, the trip button 3 is installed to ascend when the auxiliary cover 5 is opened, and a pressing protrusion 11 is formed at the lower end of the trip button to connect to the comb surface 7a of the nail 7. The circuit breaker for wiring characterized in that the pressing button is raised by the restoring force of the compression spring (4), and the pressing protrusion presses the comb surface of the nail to rotate the nail.