JP2017220348A - Circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent a coil of an electromagnet in a voltage tripping part from being burned and also to facilitate operation of a voltage tripping function without using a dedicated switch for putting the electromagnet in the voltage tripping part to an off state.SOLUTION: A circuit breaker includes: a circuit breaking main body 2 for cutting off a current flow toward a load side when overcurrent, short circuit failure or the like occurs; a voltage tripping part 3 for causing the circuit breaking main body to trip by applying a command voltage; and a tripping interlock member 41 for interlocking tripping operation of the voltage tripping part as tripping operation of the circuit breaking main body. The voltage tripping part includes an electromagnet 25 having an electromagnetic coil 28 that generates electromagnetic force by applying a command voltage thereto, and tripping mechanisms 9, 10 and 11 for tripping the voltage tripping part when the electromagnet generates electromagnetic force, and further it is configured such that when the voltage tripping part trips, the application of the command voltage to the electromagnet is stopped.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a circuit breaker such as a circuit protector applied to protect a device in a low voltage distribution system, and more particularly to a circuit breaker having a trip function for tripping by an external command.

The circuit breaker is equipped with a stationary contact, movable contact, switching mechanism and overcurrent trip device inside the main body case, blocking the flow of current to the load side in the event of an overcurrent or short circuit failure. It is a device to do.
As an accessory part of a circuit breaker, a voltage trip device that performs a trip operation (a fixed contact and a movable contact OFF state) of the circuit breaker by an external command is known (for example, Patent Document 1).
The voltage trip device of Patent Document 1 includes an electromagnet with a trip lever that drives a trip crossbar of a circuit breaker, and a coil burnout prevention switch that detects the trip operation of the circuit breaker and turns off the electromagnet excitation. Incorporated inside the body case.

JP-A-4-167323

Since the voltage trip device of Patent Document 1 limits the time during which the coil burnout prevention switch energizes the electromagnet, it can prevent the coil wound around the iron core of the electromagnet from burning out.
However, the voltage tripping device of Patent Document 1 must set the timing for operating the coil burnout prevention switch with high accuracy, and it is difficult to operate the voltage tripping device.
Therefore, the present invention reliably prevents the coil of the electromagnet of the voltage tripping portion from being burned out, and does not use a dedicated switch for turning off the electromagnet of the voltage tripping portion, thereby easily operating the voltage tripping function. It aims to provide a circuit breaker.

  In order to achieve the above object, a circuit breaker according to an aspect of the present invention includes a circuit breaker main body portion that cuts off a current flow to the load side in the event of an overcurrent, a short circuit failure, and the like, and application of a command voltage. A voltage trip unit that trips the circuit breaker main body and a trip interlocking member that links the trip operation of the voltage trip unit as a trip operation of the circuit breaker headquarters. The voltage trip unit applies a command voltage. An electromagnet having an electromagnetic coil that generates an electromagnetic force by a trip mechanism, and a trip mechanism that trips the voltage trip portion when the electromagnet generates an electromagnetic force, and when the voltage trip portion trips. Application of the command voltage to the electromagnet is stopped.

  According to the circuit breaker according to the present invention, it is possible to reliably prevent the electromagnet coil of the voltage tripping portion from being burned out and to use the voltage tripping device without using a dedicated switch for turning off the electromagnet of the voltage tripping portion. The operation of the function can be facilitated.

It is a front view which shows the circuit breaker of 1st Embodiment which concerns on this invention. It is a side view which shows the voltage trip part which comprises the circuit breaker of 1st Embodiment which concerns on this invention. It is a figure which shows the ON state of the circuit breaker main-body part which comprises the circuit breaker of 1st Embodiment which concerns on this invention, and a voltage trip part. It is a figure which shows the trip state of the circuit breaker main-body part and voltage trip part which comprise the circuit breaker of 1st Embodiment which concerns on this invention. It is a figure which shows the shape of the trip interlocking | linkage member which comprises the circuit breaker of 1st Embodiment which concerns on this invention. It is a figure showing the state where the trip interlocking member of a 1st embodiment concerning the present invention is engaged with the trip side latch receptacle of a voltage trip part.

Next, a first embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between the thickness and the planar dimensions, the ratio of the thickness of each layer, and the like are different from the actual ones. Therefore, specific thicknesses and dimensions should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.
The first embodiment described below exemplifies an apparatus and method for embodying the technical idea of the present invention, and the technical idea of the present invention is the material, shape, and structure of component parts. The arrangement is not specified below. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.

[Outline of Circuit Breaker of First Embodiment]
FIG. 1 is a front view showing a circuit breaker 1 having a voltage trip function of the first embodiment.
The circuit breaker 1 of the first embodiment is connected to a main circuit between a power source and a load, and is a unipolar circuit breaker main body 2 that cuts off the flow of current to the load side in the event of an overcurrent, short circuit failure or the like. And a voltage trip unit 3 that is connected in the width direction of the circuit breaker main body 2 and trips the circuit breaker main body 2 in response to an input of an external command (command voltage).

[Voltage tripping part]
The voltage trip unit 3 is arranged so as to be connected in the width direction (left and right direction in FIG. 1) of the circuit breaker main body 2, and the tripping case 5 of the voltage trip unit 3 is the main body of the circuit breaker main body 2. It is a member having a shape substantially divided into two in the left-right direction in FIG.
As shown in FIG. 2, a partition wall 6 is formed inside the tripping case 5 and the main body case 4 to partition the circuit breaking main body portion 2 and the voltage tripping portion 3 as separate spaces.
An input side terminal 7 and an output side terminal 8 are formed outside the tripping case 5.

And, in a space surrounded by the tripping case 5 and the partition wall 6, a tripping side fixed contactor 9 and a tripping side movable contactor 10 that open and close a circuit between the input side terminal 7 and the output side terminal 8, A tripping side opening / closing mechanism 11 for opening and closing the tripping side movable contact 10 with respect to the tripping side fixed contact 9 and a voltage tripping device 12 for tripping the tripping side opening / closing mechanism 11 are mounted. ing.
The trip-side opening / closing mechanism 11 includes a trip-side operation handle 13, a trip-side latch 14, a trip-side latch receiver 15, a support shaft, as shown in FIGS. 2 and 3A, 3B. 16 and an opening / closing spring 17.

The tripping-side operation handle 13 is rotatably supported in the tripping case 5, and the operation unit 18 protrudes from the tripping case 5 to the outside.
As shown in FIGS. 3A and 3B, the trip-side latch receiver 15 includes a movable plate portion 19, a shaft fixing portion 20 through which the support shaft 16 passes, a movable plate portion 19 and a shaft fixing portion. The connecting arm 21 is connected to the connecting arm 21. The upper end portion 10 a of the tripping side movable contact 10 is also fixed to the support shaft 16.
The trip-side latch 14 is formed with a long slot 22 having one end opened in the longitudinal direction, and the support shaft 16 is inserted into the slot 22 from the opening at one end. A locking recess 23 is formed on the opening side of the slot 22.

The open / close spring 17 has one end engaged with the movable plate portion 19 of the trip-side latch receiver 15 and the other end engaged with a wall portion (not shown) in the tripping case 5.
As shown in FIG. 3 (b), the support shaft 16 inserted into the slot 22 is locked by the locking recess 23, and the tripping side movable contact 10 contacts the tripping side fixed contact 9. In the closed state (ON state) in contact, the open / close spring 17 applies a spring force so that the trip-side latch receiver 15 and the trip-side movable contact 10 rotate counterclockwise.
As shown in FIG. 2, the voltage trip device 12 includes a trip-side electromagnet 25 and a trip-side trip bar 26 that is attracted by an electromagnetic force generated by the trip-side electromagnet 25.

The trip-side electromagnet 25 is a device in which an electromagnetic coil 28 is wound around an iron core 27. When a command voltage is applied to the electromagnetic coil 28 from the input-side terminal 7, a trip-side trip is applied to the attracting surface 27 a of the iron core 27. An electromagnetic force that attracts the bar 26 is generated.
The trip-side trip bar 26 is a member arranged so as to be rotatable in a direction away from the adsorption surface 27a from a position where it abuts on the adsorption surface 27a of the iron core 27. The spring force of the spring 29 acts to rotate away from the suction surface 27a.
The trip-side trip bar 26 is formed with a trip operation piece 30 that extends toward the trip-side latch receiver 15 of the trip-side opening / closing mechanism 11. When the trip-side movable contact 10 is in the closed state (ON state) in contact with the trip-side fixed contact 9, the trip-side trip bar 26 is adsorbed to the adsorption surface 27a of the iron core 27. The tripping piece 30 abuts on the trip-side latch receiver 15, and the trip-side latch receiver 15 rotates clockwise around the support shaft 16.

[Circuit breaker body]
Although not shown in FIG. 1, the circuit breaker main body 2 includes a power source side terminal connected to the power source side and a load side terminal connected to the load side outside the main body case 4, and the main body case 4. The main body side that opens and closes the main body side fixed contact and the main body side movable contact that opens and closes the main circuit between the power supply side terminal and the load side terminal, and the main body side movable contact with respect to the main body side fixed contact An opening / closing mechanism and an overcurrent tripping device for tripping the main body side opening / closing mechanism when an overcurrent flows in the main circuit are mounted.

The main body side fixed contact, the main body side movable contact, and the main body side opening / closing mechanism mounted inside the main body case 4 of the circuit breaker main body section 2 are mounted inside the tripping case 5 of the voltage trip section 3. The trip-side stationary contact 9, the trip-side movable contact 10 and the trip-side opening / closing mechanism 11 are substantially the same shape, and are arranged at symmetrical positions with the partition wall 6 in between.
That is, as shown in FIG. 3A, the main body side operation handle 31 of the circuit breaking main body portion 2 has the same shape as the tripping side operation handle 13 of the voltage tripping portion 3, and a voltage is connected to the outside of the main body case 4. The operation part 18 of the tripping part 3 is integrally formed.

Further, the main body side latch 32, the main body side latch receiver 33, the support shaft 34, and the open / close spring (not shown) of the circuit breaker main body portion 2 are also connected to the trip side latch 14 and the trip side latch receiver 15 of the voltage trip section 3. And the support shaft 16 and the opening / closing spring 17 are arranged at symmetrical positions with the partition wall 6 interposed therebetween.
The main body side latch 32 is open at one end in the longitudinal direction, and has a slot (not shown) into which the support shaft 34 is inserted, and a locking recess is formed on the opening side of this slot.
The main body side latch receiver 33 includes a movable plate portion 35, a shaft fixing portion 36 through which the support shaft 34 passes, and a connecting arm 37 connecting the movable plate portion 35 and the shaft fixing portion 36. .

Also, the overcurrent tripping device of the circuit breaking main body 2 is similar to the voltage tripping device 12 of the voltage tripping unit 3 as shown in FIG. And a main body side trip bar 39 that is attracted by the electromagnetic force generated.
The main body side electromagnet 38 is a device in which an electromagnetic coil (not shown) is wound around an iron core (not shown). When a current exceeding the rated current flows from the power supply side terminal to the electromagnetic coil, the main body side trip bar 39 is passed through the iron core. Electromagnetic force is generated to attract the. Then, the main body side trip bar 39 attracted to the iron core of the main body side electromagnet 38 rotates, so that the trip operation piece 40 of the main body side trip bar 39 contacts the main body side latch receiver 33, and When the main body side latch receiver 33 released from the locked state is rotated, the main body side fixed contactor and the main body side movable contactor are opened (trip state).

[About tripping interlocking members]
Next, FIG. 5 is a diagram showing a tripping interlocking member 41 that engages the tripping side latch receiver 15 of the voltage tripping section 3 and the main body side latch receiver 33 of the circuit breaking main body section 2.
The trip interlocking member 41 includes a pair of interlocking bars 42 and 43, a connecting plate 44 disposed between the pair of interlocking bars 42 and 43 disposed in parallel to each other, and an arm 45 attached to the pair of interlocking bars 42 and 43. And a bearing portion 46 fixed thereto.

As shown in FIG. 6, a rotating shaft 47 is rotatably inserted into the shaft hole 46a of the bearing portion 46 of the tripping interlocking member 41. The rotating shaft 47 is connected to the circuit breaker main body 2 and the voltage tripping member. The tripping side latch 14 of the voltage tripping unit 3 and the body side latch 32 of the circuit breaking main body 2 pass through an opening (not shown) opened in a part of the partition wall 6 partitioning the removal unit 3 as a separate space. It is supported by.
As shown in FIG. 3A, the tripping interlocking member 41 is connected to the movable plate 19 in which one interlocking rod 42 constitutes the tripping-side latch receiver 15 of the voltage tripping unit 3, and the circuit. The movable plate portion 35 is opposed to the movable plate portion 35 constituting the main body side latch receiver 33 of the blocking main body portion 2 from the lower side, and the other interlocking rod 43 is connected to the movable plate portion of the trip side latch receiver 15. 19 and the movable plate portion 35 of the main body side latch receiver 33 are arranged so as to be engageable with each other from above.

[Operation of Circuit Breaker of First Embodiment]
Next, the operation of the voltage tripping unit 3 setting the circuit breaker main body 2 in the trip state when the circuit breaker main body 2 of the circuit breaker 1 of the first embodiment is in the ON state will be described.
When the circuit breaker main body 2 is in the ON state, as shown in FIG. 3B, the voltage tripping unit 3 is configured such that the support shaft 16 of the tripping side opening / closing mechanism 11 is opened in the slot 22 of the tripping side latch 14. The tripping-side movable contact 10 is in a closed state (ON state) in contact with the tripping-side fixed contact 9.
When a command voltage is applied to the electromagnetic coil 28 of the voltage trip device 12 from the input side terminal 7, an electromagnetic force that attracts the trip-side trip bar 26 to the suction surface 27 a of the iron core 27 is generated.

When the tripping side trip bar 26 is attracted to the attracting surface 27 a of the iron core 27, the trip operation piece 30 comes into contact with the tripping side latch receiver 15, and the tripping side latch receiver 15 rotates clockwise around the support shaft 16. Move.
When the trip-side latch receiver 15 rotates clockwise, the support shaft 16 is disengaged from the latching recess 23 of the trip-side latch 14, and the spring force of the opening / closing spring 17 is applied to the trip-side movable contact 10. By acting, the tripping movable contact 10 is in an open state (OFF state) separated from the tripping side fixed contact 9 (see FIG. 4B).

Further, when the trip-side latch receiver 15 is rotated in the clockwise direction, the trip interlock member 41 engaged with the trip-side latch receiver 15 is also connected to the interlock rod 42 of the trip-side latch receiver 15. When the movable plate portion 19 is pushed up from the lower side, the movable plate portion 19 is rotated clockwise.
When the tripping interlocking member 41 rotates in the clockwise direction, the interlocking bar 43 pushes up the movable plate part 35 of the body side latch receiver 33 of the circuit breaking body part 2 from below.
Then, when the main body side latch receiver 33 rotates clockwise, the engagement between the main body side latch 32 and the main body side latch receiver 33 is released, and the circuit breaker main body portion 2 includes the main body side fixed contact and the main body side. A movable contact will be in an open state (trup state).

Next, a case where an overcurrent flows through the power supply side terminal when the circuit breaker main body 2 of the circuit breaker 1 according to the first embodiment is in the ON state will be described.
When an overcurrent that has flowed to the power supply side terminal due to an overcurrent, short circuit failure, or the like flows to the electromagnetic coil of the main body side electromagnet 38, the iron core of the main body side electromagnet 38 attracts the main body side trip bar 39, and When the tripping piece 40 abuts on the main body side latch receiver 33 and the main body side latch receiver 33 released from the locked state with the main body side latch 32 is rotated, the main body side fixed contactor and the main body side movable contactor are rotated. Becomes an open state (trip state).
The tripping state of the circuit breaker main body 2 is transmitted to the voltage tripping unit 3 via the tripping interlocking member 41, and the voltage tripping unit 3 is also in a tripped state.
Here, the electromagnet according to the present invention corresponds to the trip-side electromagnet 25, and the trip mechanism according to the present invention includes the trip-side fixed contact 9, the trip-side movable contact 10, and the trip-side opening / closing mechanism 11. It corresponds to.

[Effects of the circuit breaker of the first embodiment]
Next, the effect of the circuit breaker 1 of 1st Embodiment is demonstrated.
The circuit breaker 1 according to the first embodiment provides a command voltage to the trip-side electromagnet 25 of the voltage trip unit 3 when the body-side fixed contact and the body-side movable contact of the circuit breaker body 2 are brought into a trip state. Is applied to generate electromagnetic force in the electromagnetic coil 28, but the tripping side movable contact 10 and the tripping side fixed contact 9 of the voltage tripping unit 3 are also simultaneously with the trip state of the circuit breaking main body 2. Since the application time of the command voltage to the electromagnetic coil 28 is limited due to the open state (OFF state), burning of the electromagnetic coil 28 can be prevented.
Further, since the voltage trip unit 3 does not use a dedicated switch for stopping the supply of the command voltage to the electromagnetic coil 28 of the trip-side electromagnet 25, a circuit that facilitates the operation of the voltage trip function. The circuit breaker 1 can be provided.

In addition, the trip-side latch receiver 15 constituting the trip-side opening / closing mechanism 11 of the voltage trip section 3 and the body-side latch receiver 33 constituting the body-side opening / closing mechanism of the circuit breaking main body portion 2 are trip-linked. The member 41 is connected to rotate the trip-side latch receiver 15 when the trip-side movable contact 10 and the trip-side fixed contact 9 of the trip-side opening / closing mechanism 11 are opened (OFF state). The main body side fixed contact and the main body side movable contact are in an open state (troop state) in conjunction with the main body side opening / closing mechanism of the circuit breaking main body 2 via the tripping interlocking member 41.
As described above, the circuit breaker 1 according to the first embodiment trips the mechanical operation of the tripping side opening / closing mechanism 11 of the voltage tripping unit 3 and opens and closes the main body side of the circuit breaking main body 2 via the interlocking member 41. Since the trip state is linked to the mechanism, it is possible to provide the circuit breaker 1 with a simple structure and capable of reducing the manufacturing cost.

The circuit breaker 1 according to the first embodiment has a main body case 4 in which the circuit breaker main body portion 2 is mounted and a tripping case 5 in which the voltage tripping portion 3 is mounted. Since it has a simple structure connected in the direction, the manufacturing cost can be further reduced.
In addition, although the circuit breaker 1 of 1st Embodiment was set as the structure provided with the single pole circuit interruption main-body part 2, even if it is the structure provided with the circuit interruption main-body part 2 which has a some pole, it is the same effect. Can be played.

DESCRIPTION OF SYMBOLS 1 Circuit breaker 2 Circuit breaker main part 3 Voltage trip part 4 Body case 5 Trip case 6 Bulkhead 7 Input side terminal 8 Output side terminal 9 Trip side fixed contact 10 Trip side movable contact 11 Trip side opening / closing Mechanism 12 Voltage trip device 13 Trip-side operation handle 14 Trip-side latch 15 Trip-side latch receiver 16 Support shaft 17 Opening and closing spring 18 Operation portion 19 Movable plate portion 20 Shaft fixing portion 22 Slot 23 Locking recess 25 Trip side Electromagnet 26 Trip-side trip bar 27 Iron core 27a Adsorption surface 28 Electromagnetic coil 29 Return spring 30 Trip action piece 31 Main body side operation handle 32 Main body side latch 33 Main body side latch receiver 34 Support shaft 35 Movable plate portion 36 Shaft fixing portion 37 Connecting arm 38 Main body side electromagnet 39 Main body side trip bar 40 Trip action piece 41 Trip interlocking member 42, 43 Interlocking rod 44 Station Plate 45 the arm 46 bearing section

Claims (4)

A circuit breaker body that cuts off the flow of current to the load in the event of overcurrent, short circuit failure, etc.
A voltage tripping section that trips the circuit breaker main body by applying a command voltage; and
A trip interlocking member that interlocks the trip operation of the voltage trip unit as the trip operation of the circuit breaker main body, and
The voltage trip unit includes an electromagnet having an electromagnetic coil that generates an electromagnetic force when the command voltage is applied, and a trip mechanism that trips the voltage trip unit when the electromagnet generates the electromagnetic force. And a circuit breaker characterized in that application of the command voltage to the electromagnet is stopped when the voltage trip section trips. The circuit breaker main body includes a main body side movable contact that is separated from and in contact with the main body side fixed contact, a main body side opening / closing mechanism that opens and closes the main body side movable contact, and the main body side movable contact is fixed to the main body side An overcurrent trip device that trips the main body side opening / closing mechanism so as to be separated from the contact, and the main body side opening / closing mechanism includes a main body side latch, and the main body side movable contact is fixed to the main body side. A main body side latch receiver that is engaged with the main body side latch while being in contact with the contact, and when the main body side latch and the main body side latch receiver are unlocked, the main body side It is a mechanism for separating the movable contact from the main body side fixed contact,
The trip mechanism of the voltage trip part includes a tripping side movable contact that is separated from and coming into contact with a tripping side fixed contact, a tripping side latch, and the tripping side movable contact to the tripping side fixed contact. A trip-side latch receiver that is locked to the trip-side latch while in contact with the trip-side latch and the trip-side latch receiver is released when the trip-side latch and the trip-side latch receiver are unlocked. It is a mechanism for separating the removal side movable contact from the tripping side fixed contact,
2. The trip interlocking member is connected to the main body side latch receiver of the circuit breaker main body portion and the trip side latch receiver of the trip mechanism of the voltage trip portion. Circuit breaker as described.   The voltage trip unit includes a trip bar that is attracted and rotated by the electromagnet generating an electromagnetic force, and the trip-side latch receiver is rotated by the contact of the trip bar, so that the tripping is performed. 3. The circuit breaker according to claim 2, wherein the latch with the side latch is released.   The main body case in which the circuit breaker main body portion is mounted and the tripping case in which the voltage tripping portion is mounted are configured to be connected in the width direction. Item 4. The circuit breaker according to any one of Items 1 to 3.

Images