JP2016042430A - DC breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a circuit breaker having 2-pole 4-terminal structure in which two poles can be excellently insulated from each other even in a structure having two contacts per pole.SOLUTION: A movable contact 13 has a support shaft 20 at the center. Movable contacts 13a, 13b provided to both the ends thereof and fixed contacts 15a, 16a provided to stationary contacts 15, 16 contact/dissociate each other by turning of the movable contact 13, thereby performing connection/cut-off of a cable way L. A cut-off mechanism portion has an abnormal current detector 11 for detecting abnormal current flowing in the cable way, and an opening/closing mechanism portion for transferring an operation of an operation handle 3 to the movable contact 13 in addition to the detection operation of the abnormal current detector 11. A pair of cable ways L are disposed in a pair of cable way disposing spaces C which are formed and separated by an insulation wall 23 formed in a body case 4 so as to extend from a power-source side terminal 1 to a load side terminal 2 respectively, and the operation handle 3 and the opening/closing mechanism portion 10 are disposed on one of the pair of cable way disposing spaces C.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a DC circuit breaker, and more particularly to a DC circuit breaker having a two-pole four-contact structure having two contacts for one pole.

Since direct current does not have a current zero point like alternating current, it is more difficult to cut off than direct current. For this reason, a plurality of contacts for opening and closing the electric circuit are arranged in series, for example, two contacts, the dissociation distance is doubled and the dissociation speed is doubled compared to only one contact, and there is no current zero point. A circuit breaker has been proposed that enables a proper breaking operation. For example, in Patent Document 1, a circuit breaker having a four-pole four-contact structure is used to connect terminals in series to form a two-pole four-contact circuit breaker.
Moreover, there exists a thing of the structure disclosed by patent document 2 as a circuit breaker provided with 2 contacts with respect to 1 pole. In Patent Document 2, two fixed contacts are provided on one electric circuit, a movable contact provided with movable contacts at both ends is arranged between the two fixed contacts, and the center of the movable contact is rotated. It is configured to perform contact / dissociation of the contacts at the same time.

JP 2012-138173 A (FIG. 7) JP-A-1-166429

However, the form in which the circuit breaker having two poles and four terminals is formed using the circuit breaker having the four-pole four-terminal structure requires a large installation space because the circuit breaker itself is large.
In addition, when the contact configuration of Patent Document 2 is applied to a two-pole circuit breaker, it is possible to reduce the size of the circuit breaker because two contacts can be arranged in series, but an abnormal current flowing in the electric circuit is detected. Since the tripping mechanism that simultaneously cuts off the two electric circuits and the opening / closing mechanism that operates the operation handle to open and close the electric circuit need to be provided for the two electric circuits, the mechanism spans the left and right electric circuits. As a result, it was difficult to insulate between the electric circuits, and it was difficult to shield the arc.

  Accordingly, in view of such problems, the present invention has an object to provide a circuit breaker having a two-pole four-terminal structure that can satisfactorily insulate between two poles even in a configuration having two contacts per pole. It is said.

In order to solve the above-mentioned problems, the invention of claim 1 is characterized in that a pair of power supply side terminals are arranged at the rear part of the main body case, and a pair of load side terminals are arranged at the front part. Each of the electric circuits has two fixed contacts and a movable contact that is spanned between the two fixed contacts and forms a part of the electric circuit to connect / disconnect the electric circuit. In a DC breaker having a two-pole four-contact structure, which includes an operating handle for operating the movable contact and a breaking mechanism for detecting an abnormal current flowing in the electric circuit and breaking the movable contact, the movable contact is at the center. While having a rotation fulcrum, the movable contact provided at both ends by rotating and the fixed contact provided at the fixed contact contact / dissociate to connect / cut off the electric circuit, An abnormal current detector for detecting an abnormal current flowing in the electric circuit, and an abnormal current In addition to the detection operation of the intelligent part, it has an opening / closing mechanism part that transmits the operation of the operation handle to the movable contact, and the pair of electric paths is an insulating wall formed in the main body case from the power supply side terminal to the load side terminal And the operating handle and the opening / closing mechanism are arranged in one of the pair of electric circuit arrangement spaces.
According to this configuration, even in a configuration in which one electric circuit is provided with a set of two fixed contacts and movable contacts, that is, in a configuration in which two contacts are provided per one pole, the operation handle and the opening / closing mechanism are connected to one electric circuit. Since it arrange | positions in the arrangement | positioning space, it becomes possible to provide the insulating wall without the opening part connected to both electrical paths, and can isolate both electrical paths favorably.

According to a second aspect of the present invention, in the configuration according to the first aspect, the abnormal current detection unit is provided in both of the electric paths, and the transmission member that transmits the detection operation of the abnormal current detection unit to the opening / closing mechanism unit and performs the cutoff operation is provided. An engagement arm piece that engages both abnormal current detection parts, an operation piece that opens and closes the opening and closing mechanism part, and a body part that is spanned between the engagement arm piece and the operation piece, The trunk portion is disposed in a space formed in the insulating wall.
According to this configuration, since the transmission member is disposed in the insulating wall, it is not necessary to narrow one electric circuit disposition space or provide an opening for disposing the transmission member in the insulating wall. Can maintain good insulation.

According to a third aspect of the present invention, in the configuration of the first or second aspect, the space formed in the insulating wall is formed in a slit shape in cross section, and the body portion of the transmission member has a plate shape, and the insulating wall Is characterized in that it has an opening for projecting the engaging arm piece to the left and right, while the body has a closing portion formed around the engaging arm piece so as to close the opening.
According to this configuration, even if the opening portion through which the engaging arm piece of the transmission member protrudes is formed through the insulating wall, the closing portion formed in the trunk portion closes the gap around the engaging arm piece. The insulation of the left and right electric circuit arrangement spaces can be maintained.

  According to the present invention, even in a configuration in which one electric circuit is provided with a set of two fixed contacts and movable contacts, that is, a configuration in which two contacts are provided per one pole, the operation handle and the opening / closing mechanism are connected to one electric circuit. Since it arrange | positions in the arrangement | positioning space, it becomes possible to provide an insulating wall without an opening part between both electrical paths, and can isolate both electrical paths favorably.

An example of the DC circuit breaker according to the present invention is shown, in which (a) is a plan view and (b) is a side view. It is the sectional view on the AA line shown in FIG. It is a top view of the DC circuit breaker with the cover removed. The transmission member is shown, (a) is a perspective view, (b) is a plan view, and (c) is a side view. It is the BB sectional view taken on the line shown in FIG. It is the BB sectional view which removed the circuit breaker structural member other than a transmission member. It is explanatory drawing which extracted the contact.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an example of a DC circuit breaker according to the present invention, where (a) is a plan view and (b) is a side view. Reference numeral 1 denotes a power supply side terminal, 2 denotes a load side terminal, 3 denotes an operation handle for opening and closing the electric circuit, both terminals are constituted by two terminals, and the inside of the main body case 4 constituted by a cover 4a and a base 4b A pair of electric circuits are arranged from the power supply side terminal 1 to the load side terminal 2.
The power supply side terminal 1 and the load side terminal 2 are disposed at opposite ends of the main body case 4, the power supply side terminal 1 is disposed at the rear, the load side terminal 2 is disposed at the front, and the operation handle 3 is disposed. Is described below.

FIG. 2 is a cross-sectional view taken along line AA, showing the configuration of one of the electric circuits. In FIG. 2, reference numeral 10 denotes an opening / closing mechanism for connecting / cutting off the electric circuit in response to the operation of the operation handle 3, 11 an abnormal current detector for detecting an abnormal current, and 12 an opening / closing mechanism for detecting operation of the abnormal current detector. A transmission member 13 for transmitting to the unit 10 is a movable contact that rotates to make contact / dissociation of contacts on the electric circuit.
The opening / closing mechanism unit 10, the abnormal current detection unit 11, and the transmission member 12 constitute a blocking mechanism unit that receives an abnormal current and blocks the electric circuit. L represents an electric circuit, and the electric circuit L is disposed from the power supply side terminal 1 to the load side terminal 2.

  The electric circuit L includes two fixed contacts (first fixed contact 15 and second fixed contact 16) having fixed contacts (first fixed contact 15a and second fixed contact 16a) at the tip, and both fixed contacts. The movable contact 13 is provided between the rear ends and the front ends and is provided with movable contacts 13a and 13b. Further, in the vicinity of the load side terminal 2 of the electric circuit L, a bimetal piece 17, an electromagnetic device 18, and the like constituting the abnormal current detection unit 11 are assembled.

  Here, the movable contact 13 and the fixed contacts 15 and 16 will be specifically described. The rear end of the first fixed contact 15 is connected to the power supply side terminal 1, the front is disposed at the bottom of the main body case 4, and the first fixed contact 15 a is provided upward at the tip. On the other hand, the second fixed contact 16 is disposed at an intermediate position of the main body case 4, the front is connected to the bimetal piece 17, and the second fixed contact 16a is provided downward at the rear end. In addition, the other electric circuit L arrange | positioned adjacently is comprised similarly.

The movable contact 13 is configured as shown in FIG. FIG. 7 is an explanatory view showing a state in which the left and right movable contacts are connected. As shown in FIG. 7, a pair of the movable contacts 13 is arranged on the left and right corresponding to the two electric paths L. It is connected. The first movable contact 13a is disposed downward at the rear end, and the second movable contact 13b is disposed upward at the front end.
The first movable contact 13a contacts / dissociates with respect to the first fixed contact 15a, and the second movable contact 13b contacts / dissociates with respect to the second fixed contact 16a. This constitutes a so-called two-pole four-contact structure.
The movable contact 13 is held by a casing 21 connected to the opening / closing mechanism 10, and the opening / closing operation of the opening / closing mechanism 10 is transmitted to the movable contact 13 via the casing 21.

FIG. 3 shows a plan view of the DC circuit breaker with the cover 4a of FIG. 1 removed. As shown in FIG. 3 (and FIG. 1), the operation handle 3 is arranged on one electric circuit L, and the opening / closing mechanism 10 is arranged below the operation handle 3 as shown in FIG. That is, the opening / closing mechanism unit 10 is also arranged on one electric circuit L.
On the other hand, the abnormal current detection unit 11 is provided in both the electric paths L, and is arranged so as to press the transmission member 12 forward when an abnormal current is detected.

4A and 4B show the transmission member 12. FIG. 4A is a perspective view, FIG. 4B is a plan view, and FIG. 4C is a side view. The transmission member 12 extends from side to side and engages with the abnormal current detector 11, an engagement arm piece 12 a, a rod-like operation piece 12 b that opens or closes the opening / closing mechanism 10, and an engagement arm piece 12 a It has the trunk | drum 12c which connects the operation piece 12b. The trunk portion 12c is widely formed in the vertical and front-rear directions and is formed in a thin plate shape in the left-right direction.
The trunk portion 12c has a closing portion W formed so as to protrude around the engaging arm piece 12a, and prevents a gap from being generated in a second opening portion 23c of the insulating wall 23 described later. In addition, the operation piece 12b protrudes only in the direction of the one electric circuit L in which the opening / closing mechanism unit 10 is arranged.

FIG. 5 shows a cross section taken along line B-B of the main body case 4 from which the circuit breaker component is removed. As shown in FIG. 5, an insulating wall 23 is erected in the center of the main body case 4, the left and right sides of the main body case 4 are separated from each other, and two independent electric circuit arrangement spaces C (C1, C2). ) Is formed. The electric circuit L is disposed in each of the electric circuit arrangement spaces C1 and C2. The cross-sectional view taken along the line AA in FIG. 2 shows the electric circuit arrangement space C1 on the left side shown in FIG.
Reference numeral 23a denotes a slit-shaped space formed in the insulating wall 23, and the body 12c of the transmission member 12 is slidably accommodated in the space 23a.

FIG. 6 shows a cross section taken along line AA of the main body case 4 from which the circuit breaker constituting member is removed, and shows the state of the insulating wall 23. However, the transmission member 12 is shown in a mounted state. In FIG. 6, 1 a is a power supply side terminal arrangement portion, 2 a is a load side terminal arrangement portion, and the insulating wall 23 is formed over the entire body case 3 from the power supply side terminal 1 to the load side terminal 2.
Reference numeral 23b denotes a first opening formed through the insulating wall 23 so as to pass through the support shaft 20 of the movable contact 13, and reference numeral 23c denotes an insulating wall 23 for projecting the engaging arm piece 12a of the transmission member 12 to the left and right. The insulating wall 23 has two holes penetrating left and right. Reference numeral 23 d denotes an operation hole for projecting the operation piece 12 b of the transmission member 12 into one electric circuit arrangement space C 1, and the operation hole 23 d is formed only on one surface of the insulating wall 23.

  With respect to the two holes formed in this way, the first opening 23b is closed by inserting the support shaft 20 when the movable contact 13 is assembled. Further, as shown in FIG. 6, the second opening 23c is closed by the closing portion W of the transmission member 12 disposed in the insulating wall 23, and both the first opening 23b and the second opening 23c are circuit breaker components. It is blocked by assembling.

As described above, even in a configuration in which one electric circuit L is provided with a set of two fixed contacts 15a and 16a and movable contacts 13a and 13b, that is, a configuration having two contacts per pole, Since the operation handle 3 is arranged in one electric circuit arrangement space C, an insulating wall 23 without an opening communicating with both electric circuits L can be provided, and both electric circuits L can be well insulated.
Further, since the transmission member 12 is disposed in the insulating wall 23, there is no need to narrow one electric circuit arrangement space C or provide an opening for arranging the transmission member 12 in the insulating wall 23. Good insulation between electrical paths can be implemented.
Furthermore, even if the opening 23c for projecting the engaging arm piece 12a of the transmission member 12 is formed through the insulating wall 23, the closing portion W formed in the trunk portion 12c closes the gap around the engaging arm piece 12a. Therefore, the insulation of the left and right electric circuit arrangement spaces L can be maintained.

  In the above embodiment, the abnormal current detection unit 11 presses the transmission member 12 forward to cut off the opening / closing mechanism unit 10, but the transmission member 12 is pushed backward in the opposite direction to cut off. You may let them.

  1 .... Power supply side terminal 2 .... Load side terminal 3 .... Operating handle 4 .... Main body case 10 .... Opening / closing mechanism part 11 .... Abnormal current detection part 12 .... Transmission member 12a ... Engagement arm piece, 12b ... Operation piece, 12c ... Body part, 13 ... Movable contact, 15 .... First fixed contact, 16 .... Second fixed contact, 20 .... Support shaft Fulcrum), 23 .. insulating wall, 23 c .. second opening (opening), C .. electric circuit arrangement space, L .. electric circuit, W.

Claims (3)

A pair of power supply side terminals are arranged at the rear part of the main body case, and a pair of load side terminals are arranged at the front part. A pair of electric circuits are arranged from the power supply side terminals to the load side terminals, and each of the electric circuits has two fixed contacts. An operation handle for operating the movable contact, and a movable contact that spans between the fixed contacts and forms a part of the electrical path to connect / cut off the electrical path. A two-pole four-contact DC breaker having a breaking mechanism that detects an abnormal current flowing in the electric circuit and cuts off the movable contact;
The movable contact has a rotation fulcrum in the center, and the movable contact provided at both ends rotates and the fixed contact provided on the fixed contact makes contact / dissociation operation to connect / cut off the electric circuit. While
The interruption mechanism unit includes an abnormal current detection unit that detects an abnormal current flowing in the electric circuit, and an opening / closing mechanism unit that transmits the operation of the operation handle to the movable contact in addition to the detection operation of the abnormal current detection unit. Have
The pair of electric circuits are respectively disposed in a pair of electric circuit arrangement spaces formed by insulating walls formed in the main body case from the power supply side terminal to the load side terminal,
The operation handle and the opening / closing mechanism are arranged in one of the pair of electric circuit arrangement spaces. The abnormal current detection unit is provided on both electric paths, and the transmission member that transmits the detection operation of the abnormal current detection unit to the opening / closing mechanism unit to perform the cutoff operation is engaged with both of the abnormal current detection units. An arm piece, an operation piece for opening and closing the opening / closing mechanism, and a torso spanned between the engagement arm piece and the operation piece,
2. The DC circuit breaker according to claim 1, wherein the body portion is disposed in a space formed in the insulating wall. The space formed in the insulating wall is formed in a slit shape in cross section, and the body portion of the transmission member has a plate shape,
The insulating wall has an opening for projecting the engaging arm piece to the left and right, while the body has a closing portion formed to project around the engaging arm piece so as to close the opening. The DC circuit breaker according to claim 1 or 2, characterized in that:

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