JP5922426B2 - Circuit breaker - Google Patents

Description

  The present invention relates to a circuit breaker installed in a distribution board, for example.

Conventionally, a circuit breaker having a current measuring function has been devised. For example, in the circuit breaker described in Patent Document 1, a separate unit including a core made of a magnetic material for measuring the circuit current and a Hall element for detecting a magnetic field generated in the core is used as the circuit breaker. It is attached and current value information can be output to the outside.
By providing a current measurement function for each circuit breaker in this way, it becomes possible to manage the power consumption of the entire dwelling unit in detail, so circuit breakers equipped with such a current measurement function will become widespread in the future. It is possible to do. In particular, in houses equipped with power generation equipment such as photovoltaic power generation equipment, it is necessary to manage individual power equipment in order to save electricity in the house, and circuit breakers equipped with a current measurement function are required. Further spread is conceivable.
On the other hand, as the circuit breaker has been made thinner, for example, as described in Patent Document 2, a circuit breaker in which a necessary member is accommodated in a case having a thickness of about 10 mm has been devised.

Special table 2008-547155 gazette JP 2008-152975 A

  Here, when the circuit breaker described in Patent Document 2 is provided with a current measuring function by incorporating a core or Hall element as described in Patent Document 1, the position of the Hall element with respect to the core is surely determined. If it is not kept constant, the accuracy of current measurement will deteriorate. That is, it is necessary to prevent the core from being displaced in the case of the circuit breaker.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a circuit breaker having a fixing structure capable of reliably fixing a core.

To achieve the above object, the invention according to claim 1 of the present invention, there is provided a circuit breaker for interrupting the electric path when an overcurrent or short-circuit occurs, the core having a gap of predetermined width, said a Hall element for detecting the magnetic field generated in the core is incorporated is disposed in the gap, one Ru measurable der the current flowing in said path, said core, rectangular hole-shaped insertion for inserting the path holes are formed Rutotomoni, on the inner surface of the circuit breaker case, wherein the inner fixing means for fixing the contact with the core at the four corners of at least the insertion hole.
The invention according to claim 2 is characterized in that, in the invention according to claim 1, outer fixing means is provided on the inner surface of the case to contact the outer peripheral surface of the core and fix the core. To do.

According to the present invention, the insertion hole provided in the core is formed into a square hole shape, and on the inner surface of the case of the circuit breaker, an inner fixing means for fixing the core in contact with at least the four corners of the insertion hole is provided. Since the core can be fixed from the inner peripheral surface side, the core is not displaced after being fixed to the case of the circuit breaker. Therefore, the position of the Hall element with respect to the core can be reliably held constant, and current measurement can be performed with high accuracy.
According to the invention described in claim 2, the outer fixing means for fixing the core by contacting the outer peripheral surface of the core is provided on the inner surface of the case so that the core can be fixed from the outer peripheral surface side. Therefore, it is possible to prevent further positional deviation in the fixed state of the core, and to perform current measurement with higher accuracy.

It is explanatory drawing which showed the internal mechanism of the circuit breaker from the side. It is perspective explanatory drawing which showed the state which the circuit breaker decomposed | disassembled. It is explanatory drawing which expanded and showed the fixed space periphery of the core in a circuit breaker case. It is explanatory drawing which showed the core.

Hereinafter, a circuit breaker according to an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an explanatory view showing the internal mechanism of the circuit breaker 1 from the side. FIG. 2 is an explanatory perspective view showing a state in which the internal mechanisms other than the core 31 and the Hall element 32 of the circuit breaker 1 are omitted and disassembled. FIG. 3 is an explanatory view showing the periphery of the fixed space 41 of the core 31 in the circuit breaker case in an enlarged manner. In addition, let the left-right direction of FIG. 1 be the front-back direction of the circuit breaker 1, and let the front and back direction of FIG.

  The circuit breaker 1 is used for a single-phase three-wire electric circuit composed of a neutral wire and two voltage wires, and is composed of a pair of cases (left case 2 and right case 3) assembled. On the rear part of the resin breaker case, there are three terminals 4a, 4b, 4c arranged in a vertical line on the power supply side terminal 4, and three terminals 5a, 5b to which load wiring can be inserted and connected to the front part. Load-side terminals 5 made of 5c are respectively arranged. In the power supply side terminal 4, the upper terminal 4 a is a neutral electrode terminal, the center terminal 4 b and the lower terminal 4 c are voltage electrode terminals, and the voltage electrode terminal (here, the center electrode) used with the upper terminal 4 a that is a neutral electrode terminal. A U-shaped terminal fitting 6 is installed on the terminal 4b) and is formed as a plug-in type terminal that can be connected simply by inserting a conductor bar (not shown) disposed in the distribution board or the like. Yes. On the other hand, in the load side terminal 5, the terminals 5a to 5c are arranged in a line in the vertical direction on the inclined surface of the front of the circuit breaker case, the central terminal 5b is a neutral electrode terminal, the upper terminal 5a and the lower terminal 5c are It is a voltage electrode terminal. And the terminal metal fitting 7 which has the fixed contact 7a is installed in the voltage terminal (here upper terminal 5a) used as the center terminal 5b which is a neutral electrode terminal, and load wiring is connected via the terminal hole 8. It is formed as a quick connection terminal that can be connected simply by inserting the electric wire portion into the circuit breaker case.

  Further, in the breaker case, there are a movable electromagnetic piece 9 that instantaneously cuts off when a short-circuit current occurs, a bimetal piece 10 that cuts off when an overcurrent occurs, a current transformer 11 for measuring electric circuit current, and a movable contact 12a. , 12a, and an opening / closing mechanism 12 for connecting / disconnecting the movable contacts 12a, 12a to / from the fixed contacts 7a, 7a. Further, on the upper surface of the circuit breaker case, there is provided an operation handle 13 for operating the opening / closing mechanism 12 by turning operation in the front-rear direction to turn on / off the electric circuit.

  In addition, at the upper rear corner in the circuit breaker case, a core 31 made of a magnetic material, an element substrate 33 on which a Hall element 32 for detecting a magnetic field generated in the core 31 is mounted, and a value detected by the Hall element 32 are externally provided. A connector board 35 on which a connector 34 for outputting is mounted. In addition, a connection port 36 is opened at the upper rear portion of the circuit breaker case, and the connector 34 is exposed in the connection port 36. A cylindrical rib 37 protrudes upward from the rear upper surface of the circuit breaker case so as to surround the connection port 36, and even if an external device (not shown) is connected to the connector 34, the connector 34 It is possible to reduce the stress on the rib 37 by receiving the stress. The hall element 32 and the connector 34 are in an electrically connected state.

Here, the fixing structure of the core 31, which is a main part of the present invention, will be described. FIG. 4 is an explanatory diagram showing the core 31 in an enlarged manner.
The core 31 is formed in a rectangular frame shape that is long in the front-rear direction, and a gap 31a having a predetermined width (2 mm in this case) is provided in the vertical direction on the short side portion on the rear side. In addition, the outer peripheral surface of the core 31, that is, the outer peripheral surface of the long side serving as the upper side or the lower side (the upper surface of the upper side and the lower surface of the lower side), and the outer peripheral surface of the short side serving as the front side or the rear side (the front surface of the front side and The rear surface of the rear side is a flat surface. Furthermore, the left and right side surfaces of the core 31 are also formed flat. In addition, an insertion hole 31b through which the flexible wire 20 constituting the electric path is inserted is provided in the central portion of the core 31 so as to penetrate in the left-right direction. The insertion hole 31 b is a substantially square hole, and its peripheral surface (inner peripheral surface of the core 31) is provided substantially parallel to each side of the core 31. That is, the peripheral surface of the insertion hole 31b has an upper surface parallel to the upper side of the core 31, a front surface parallel to the front side, a lower surface parallel to the lower side, and a rear surface parallel to the rear side divided by the gap 31a. It consists of. However, each surface of the insertion hole 31b is connected via the curved surface R.

  On the other hand, at the upper rear corner of the right case 3, a front fixing rib 39 extending in the vertical direction, a front portion integrally extending rearward from the lower end of the front fixing rib 39, and the front portion A fixing space 41 for the core 31 is provided that is partitioned by a lower surface fixing rib 40 that includes a rear portion that is provided rearwardly at a predetermined interval. In addition, an inner fixing rib 42 that can be inserted into the insertion hole 31b is projected from the inner surface of the right case 3 toward the inner side of the case (leftward) at the approximate center of the fixing space 41. The inner fixing rib 42 is suspended downward from both the top surface portion 42a and the top surface portion 42a that contacts the upper surface of the insertion hole 31b when inserted into the insertion hole 31b of the core 31, and the front surface or the rear surface of the insertion hole 31b. The flexible electric wire 20 is further passed through the inner fixing rib 42. The flexible electric wire 20 is further passed through the inner fixing rib 42. As shown in FIG. In addition, the base end portion (synonymous with both end portions of the top surface portion 42a) and the distal end portion of each hanging portion 42b, 42c are curved surfaces that can come into contact with the curved surface R of the insertion hole 31b when inserted into the insertion hole 31b. Is formed. When the inner fixing rib 42 is inserted into the insertion hole 31b of the core 31, the rear hanging part 42c closes the communication part between the gap 31a and the insertion hole 31b as shown in FIG. In addition to the function of fixing the core 31, the function of increasing the insulation distance between the Hall element 32 located in the gap 31a and the flexible wire 20 is also achieved. In addition, the space between the front part and rear part of the lower surface fixing rib 40 is a member which comprises an electric circuit, Comprising: The space for installing the copper bar (not shown) to which the end of the flexible wire 20 is connected. (Space for electric circuit arrangement).

  Further, fixing portions 43 and 43 for fixing the element substrate 33 are provided further rearward of the lower surface fixing rib 40, and a position that is further rearward of the fixing portions 43 and 43 and below the connection port 36. Is formed with a storage space provided with mounting portions 44, 44,... For fixing the connector substrate 35.

  On the other hand, the upper surface of the left case 2 that fits between the upper surface of the core 31 that is housed in the fixed space 41 and the upper surface of the right case 3 when it is assembled to the right case 3 and that contacts the upper surface of the core 31. A fixing rib 45 protrudes inward (rightward) of the case. In addition, the inner surface of the left case 2 has a portal shape that is in contact with the side surface of the core 31 that is housed in the fixed space 41 when assembled to the right case 3 (although the shape is the same as the inner fixed rib 42). Side fixing ribs (not shown) of a large portal shape are provided in a protruding manner.

  Then, the fixing work of the core 31 will be described. First, the core 31 is set to a predetermined posture in which the gap 31a faces rearward, and the core 31 is put into the fixing space 41 of the right case 3 in the insertion hole 31b in the posture. The inner fixing rib 42 is stored while being inserted. Then, as described above, each of the portions 42a to 42c of the inner fixing rib 42 abuts on the peripheral surface except the lower surface of the insertion hole 31b, and the curved surfaces R at the four corners of the insertion hole 31b are in contact with the hanging portions 42b and 42c. The base end portion (both end portions of the top surface portion 42a) and the curved surface provided at the distal end portion are in contact with each other. That is, the core 31 is fixed from the inner peripheral surface side. The front surface of the core 31 is in contact with the front surface fixing rib 39, the lower surface is in contact with the lower surface fixing rib 40, and the right side surface of the core 31 is in contact with the inner surface of the right case 3. When the left case 2 is assembled to the right case 3, the upper surface fixing rib 45 contacts the upper surface of the core 31, and the side surface fixing rib contacts the left side surface of the core 31, and the core 31 is also fixed from the outer peripheral surface side. Thus, the fixing work of the core 31 is completed. The element substrate 33 on which the Hall element 32 is mounted is fixed to the right case 3 in a posture in which the Hall element 32 is positioned in the gap 31a after the core 31 is stored in the fixed space 41. What is necessary is just to fix to 43 and 43 by screwing etc. Similarly to the element substrate 33, the connector substrate 35 may be fixed to the attachment portions 44, 44... Together with the element substrate 33 after the core 31 is stored in the fixing space 41.

  According to the circuit breaker 1 having the above configuration, the insertion hole 31b provided in the core 31 is formed into a substantially square hole shape, and the four corners of the insertion hole 31b and the insertion hole 31b are formed on the inner surface of the circuit breaker case. The inner fixing rib 42 is provided so that the core 31 can be fixed by contacting the peripheral surface except the lower surface, and the core 31 can be fixed from the inner peripheral surface side, so that the core 31 is positioned after fixing to the circuit breaker case. Does not shift. Therefore, the position of the Hall element 32 with respect to the core 31 can be reliably held constant, and current measurement can be performed with high accuracy.

  Further, the core 31 is also formed from the outer peripheral surface side by the inner surface of the right case 3, the front surface fixing rib 39 and the lower surface fixing rib 40 provided on the right case 3, and the upper surface fixing rib 45 and the side surface fixing rib provided on the left case 2. It can be fixed. Therefore, it is possible to prevent further positional deviation when the core 31 is fixed, and to perform current measurement with higher accuracy.

  Furthermore, the core 31 is formed in a rectangular frame shape, and the outer peripheral surface of the core 31, that is, the upper surface of the upper side, the lower surface of the lower side, the front surface of the front side, and the rear surface of the rear side are flat surfaces. Therefore, it is possible to prevent the positional deviation of the core 31 in the fixed state very reliably, and to perform current measurement with extremely high accuracy.

  In addition, since the four corners of the insertion hole 31b are curved surfaces R, the number of magnetic fluxes at the magnetic field detection position by the Hall element 32, that is, the magnetic flux passing through the gap 31a, compared to the case where the four corners are right-angled surfaces. The number of can be increased. Therefore, the accuracy of current measurement can be improved.

  The circuit breaker according to the present invention is not limited to the aspect of the above-described embodiment, and the structure of the core case and the core fixing mechanism as well as the structure of the main body case and the internal mechanism related to the circuit breaking. Etc. can be changed as needed.

For example, in the above embodiment, the inner fixing means is the inner fixing rib 42 composed of the top surface portion 42a and the pair of hanging portions 42b, 42c. However, if the four corners of the insertion hole 31b can be fixed in particular, the positional deviation preventing effect is achieved. Therefore, there is no problem even if, for example, four strut-shaped protrusions are provided so as to serve as the inner fixing means.
Similarly, the outer fixing means can be changed as appropriate, and may be omitted if not necessary.
Furthermore, the shape of the insertion hole 31b provided in the core 31 can also be changed, and the four corners of the insertion hole 31b are curved surfaces R, but may be right-angled surfaces.
In addition, the design of the position where the core 31 is fixed in the circuit breaker case, that is, the installation position of the fixed space 41 can be changed as appropriate, and the element substrate 33 and the connector substrate 35 are integrally formed ( In other words, the Hall element 32 and the connector 34 are mounted on the same substrate).

  1 ... Circuit breaker 2 ... Left case 3 ... Right case 20 ... Flexible wire 31 ... Core 31a ... Gap 31b ... Insertion hole 32 ... Hall element 33 ... Element board 34, Connector 35, Connector board 36, Connection port 37, Rib 39, Front fixing rib (outside fixing means) 40, Bottom fixing rib (outside fixing means), 41..Fixing space, 42..Inner fixing rib (inner fixing means), 42a..Top surface part, 42b, 42c..Drop, 43..Fixing part, 44..Mounting part, 45..Upper surface fixing rib (Outside fixing means), R ... curved surface.

Claims (2)

A circuit breaker for interrupting the electric path when an overcurrent or short-circuit occurs,
A core having a gap of a predetermined width, are disposed in the gap built and Hall element for detecting the magnetic field generated in the core, while Ru measurable der the current flowing in said path,
The core, are rectangular hole-shaped insertion hole formed for inserting the path Rutotomoni,
The inner surface of the circuit breaker case, the circuit breaker, characterized in that the inner fixing means for fixing the core in contact with the four corners of at least the insertion hole. 2. The circuit breaker according to claim 1, wherein an outer fixing means is provided on an inner surface of the case so as to contact the outer peripheral surface of the core and fix the core.

Images