JP2015103411A - Earth leakage breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earth leakage breaker capable of reducing the number of components and facilitating an assembly work.SOLUTION: An earth leakage breaker comprises: a housing configured by a base body and a cover body; a fixed contactor having a fixed contact attached to the base body of the housing; a movable contactor having a movable contact connected with and disconnected from the fixed contact of the fixed contactor; an opening/closing mechanism part making the movable contact of the movable contactor and the fixed contact of the fixed contactor perform an opening/closing operation to open/close a power supply side cable way and a load side cable way; a zero-phase current detection circuit part attached to the base body of the housing, and configured by a circuit board and a zero-phase current transformer attached to the circuit board; and a leak tripping coil part attached to the circuit board to which the zero-phase current transformer of the zero-phase current detection circuit part is attached, and coupled with the opening/closing mechanism part.

Description

  The present invention relates to, for example, a bipolar leakage breaker.

  In a conventional, for example, a two-pole type earth leakage breaker, an opening / closing mechanism is disposed at the center of the housing, and is configured by a circuit board on one side of the housing and a zero-phase current transformer attached to the circuit board. The zero-phase current detection circuit section is arranged, and the earth leakage tripping coil section is arranged on the other side of the housing via the opening / closing mechanism section. There is a ground fault protection dedicated earth leakage circuit breaker of shock wave non-operating type that is housed in a body structure.

  In addition, for overload short circuit protection, there is an overload / short circuit protection type earth leakage circuit breaker that is further provided with an overcurrent tripping bimetal part in addition to the above-mentioned earth leakage circuit breaker dedicated for ground fault protection. .

Japanese Utility Model Publication No. 01-54245

  However, in the above-described conventional earth leakage breaker, the switching mechanism is disposed between the zero-phase current detection circuit and the earth leakage trip coil, and the zero-phase current detection circuit and the earth leakage trip coil There was a problem in that the connection between the insulated wires was necessary because of the separation. Moreover, since the leakage trip coil, the switching mechanism, and the zero-phase current detection circuit are arranged in the direction of the electric circuit on the power supply side and the load side, the size of the leakage breaker is increased. was there.

  And the connection by an insulated wire is main also as a power supply means to a zero phase current detection circuit part. When the power supply side and load side are used in reverse connection, accessory parts such as a micro switch are required, and the number of parts and the work load are also required. As a result, there has been a problem that a well-experienced experience is required because internal confirmation cannot be performed in the connection work process.

  In addition, depending on the connection work, there is a problem that secondary troubles due to poor conduction may occur due to inexperienced experience.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an earth leakage circuit breaker that facilitates assembling work of parts and simplifies connection work. It is for the purpose.

  An earth leakage circuit breaker according to the present invention includes a housing composed of a base body and a cover body, a stationary contact having a stationary contact attached to the base body of the housing, and the stationary contact of the stationary contact. A movable contactor having a movable contact that is contacted with and separated from, and an opening / closing mechanism that opens and closes the power supply side circuit and the load side circuit by opening and closing the movable contact of the movable contact and the fixed contact of the fixed contactor And a zero-phase current detection circuit unit that is attached to the base body of the housing and includes a circuit board and a zero-phase current transformer attached to the circuit board, and the zero-phase current detection circuit unit An earth leakage tripping coil portion attached to the circuit board on which a zero-phase current transformer is attached and connected to the switching mechanism portion is provided.

  According to the earth leakage breaker according to the present invention, the circuit board on which the zero-phase current transformer of the zero-phase current detection circuit unit is mounted is provided with the earth leakage tripping coil unit connected to the switching mechanism unit. Thus, it is possible to obtain an earth leakage circuit breaker that facilitates the assembly work and simplifies the connection work.

It is sectional drawing which shows the ON state in the earth leakage circuit breaker concerning Embodiment 1 of this invention. It is a perspective view which shows the earth leakage trip coil part in the earth leakage circuit breaker concerning Embodiment 1 of this invention. It is a perspective view which shows the zero phase current detection circuit part in the earth leakage circuit breaker concerning Embodiment 1 of this invention. FIG. 3 is a perspective view showing a leaf spring in the earth leakage circuit breaker according to Embodiment 1 of the present invention. FIG. 3 is a perspective view showing a base portion in the earth leakage circuit breaker according to Embodiment 1 of the present invention. FIG. 3 is a perspective view showing a state where a zero-phase current detection circuit unit is inserted into a base unit in the earth leakage circuit breaker according to Embodiment 1 of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an exploded state of an earth leakage circuit breaker according to Embodiment 1 of the present invention. FIG. 3 is a cross-sectional view showing a state during an opening / closing operation in the earth leakage circuit breaker according to Embodiment 1 of the present invention. It is sectional drawing which shows the OFF state in the earth leakage circuit breaker concerning Embodiment 1 of this invention. It is sectional drawing which shows the ON state in the earth leakage circuit breaker concerning Embodiment 2 of this invention.

Embodiment 1 FIG.
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 9. In the drawings, the same or equivalent members and parts will be described with the same reference numerals. 1 is a cross-sectional view showing an ON state in an earth leakage circuit breaker according to Embodiment 1 of the present invention. FIG. 2 is a perspective view showing an earth leakage tripping coil portion in the earth leakage circuit breaker according to Embodiment 1 of the present invention. FIG. 3 is a perspective view showing a zero-phase current detection circuit unit in the earth leakage circuit breaker according to Embodiment 1 of the present invention. FIG. 4 is a perspective view showing a leaf spring in the leakage breaker according to Embodiment 1 of the present invention. FIG. 5 is a perspective view showing a base portion in the leakage breaker according to Embodiment 1 of the present invention. FIG. 6 is a perspective view showing a state in which the zero-phase current detection circuit unit is inserted into the base unit in the ground fault circuit breaker according to Embodiment 1 of the present invention. FIG. 7 is a perspective view showing an exploded state of the leakage breaker according to Embodiment 1 of the present invention. FIG. 8 is a cross-sectional view showing a state during the opening / closing operation of the earth leakage circuit breaker according to Embodiment 1 of the present invention. FIG. 9 is a cross-sectional view showing an OFF state in the leakage breaker according to Embodiment 1 of the present invention.

In each of these drawings, reference numeral 1 denotes a housing constituted by a base body 2 made of an insulating material and a cover body 3 made of an insulating material. Reference numeral 4 denotes an opening / closing mechanism housing portion for housing an opening / closing mechanism portion 200 (to be described later) formed on the base body 2, and reference numeral 5 denotes a zero phase current detection circuit housing for housing a later-described zero phase current detection circuit portion 100 formed on the base body 2. , 6 is a leaf spring housing portion formed in the base body 2, 7 is a pin body provided in the leaf spring housing portion 6, 8 is a pin body provided in the leaf spring housing portion 6, and 9 is in the base body 2. The formed power supply side terminal mounting portions 10 are load side terminal mounting portions formed on the base body 2.

  Reference numeral 11 denotes a fixed contact attached to the base body 2, one side being configured as a power supply side terminal 12 and being attached to the power supply side terminal attaching portion 9, and the other side being configured as a fixed contact 13. Reference numeral 14 denotes a load side terminal attached to the load side terminal attaching portion 10. Reference numeral 15 denotes an arc extinguishing device provided with a driving rod 16. The arc extinguishing device 15 is fitted to the fixed contact 11 by fitting the driving rod 16 of the arc extinguishing device 15 into a hole 11 a formed in the fixed contact 11. Wearing. The arc extinguishing device 15 attracts the arc at the time of interruption and extinguishes the arc. The driving rod 16 is also driven into the base body 2 to fix the fixed contact 11 to the base body 2.

  Reference numeral 17 denotes a leaf spring accommodated in the leaf spring accommodating portion 6 of the base body 2. As shown in FIG. 4, the leaf spring 17 has one side 17a in contact with a movable contact 20 described later, and the other side 17b is elastic. For example, it is formed in a U-shape, and an engagement hole 17 c serving as an engagement portion is provided on the other side 17 b of the leaf spring 17. The leaf spring 17 is formed with a hole 17d fitted into the pin body 7 provided in the leaf spring accommodating portion 6 and a hole 17e fitted into the pin body 8 provided in the leaf spring accommodating portion 6. Has been. The case where two leaf springs 17 are arranged in parallel is shown. Reference numeral 18 denotes a barrier which is disposed between the leaf springs 17 and has a hole 18a fitted in the pin body 8 provided in the leaf spring accommodating portion 6 and in contact with a conductor which will be described later.

  Reference numeral 19 denotes a conductor that passes through a zero-phase current transformer 102 of the zero-phase current detection circuit unit 100 described later and is fixed to a movable contact 20 described later by a rivet 21 and connects the load-side terminal 14 and the movable contact 20. is there. Reference numeral 20 denotes a movable contact having a spring force provided on one side corresponding to the conductor 19 and corresponding to the fixed contact 11. The other side of the movable contact 20 is connected to the fixed contact 13 of the fixed contact 11 with a predetermined gap. A movable contact 22 is provided so as to face and separate from each other. A push plate 23 is connected to an opening / closing mechanism 200 described later and supports the movable contact 20 so as to be movable up and down. The movable contact 22 is lowered by lowering the movable contact 20 with an upper piece 23a of the push plate 23. Is brought into contact with the fixed contact 13 to bring the electric circuit into a closed state, and the movable contact 22 is separated from the fixed contact 13 by raising the movable contact 20 upward by the lower piece 23b of the push plate 23, thereby bringing the electric circuit into an open circuit state.

  Reference numeral 100 denotes a zero-phase current detection circuit unit including a circuit board 101 and a zero-phase current transformer 102 mounted on the circuit board 101. Reference numeral 300 denotes an earth leakage trip coil unit that is mounted on the circuit board 101 on which the zero-phase current transformer 102 of the zero-phase current detection circuit unit 100 is mounted, and is connected to an opening / closing mechanism unit 200 described later. The circuit board 101 of the zero-phase current detection circuit unit 100 to which the zero-phase current transformer 102 and the leakage current tripping coil unit 300 are attached is a zero-phase housing the zero-phase current detection circuit unit 100 formed in the base body 2. The circuit board 101 of the zero-phase current detection circuit unit 100 is pressed into and inserted into a predetermined position by the elastic force of the U-shape of the other side 17b of the leaf spring 17 to the current detection circuit housing unit 5.

  As shown in FIG. 2, the earth leakage tripping coil unit 300 includes a coil bobbin 301 and a coil unit 302, and is provided with a terminal 303 and a test pin 304 that can be easily combined with the circuit board 101 of the zero-phase current detection circuit unit 100. By connecting the terminal 303 and the test pin 304 to the circuit board 101 of the zero-phase current detection circuit unit 100, the leakage trip coil unit 300 can be attached to the circuit board 101 of the zero-phase current detection circuit unit 100. It has become. A test spring 305 is also provided integrally. The earth leakage tripping coil unit 300 includes a plunger 306 that is connected to an opening / closing mechanism unit 200 described later.

FIG. 3 shows a state in which the zero-phase current transformer 102 and the earth leakage tripping coil unit 300 are mounted on the circuit board 101 of the zero-phase current detection circuit unit 100. A test winding 103 penetrates the zero-phase current transformer 102 so that a pseudo leakage current flows for an operation test of the zero-phase current detection circuit unit 100. Reference numeral 104 denotes an engagement pin that is provided on the circuit board 101 and is an engagement portion that engages with the engagement hole 17 c on the other side 17 b of the leaf spring 17. When the engagement pin 104 provided on the circuit board 101 is engaged with the engagement hole 17c on the other side 17b of the plate spring 17, the circuit board 101 and the plate spring 17 are compressed by the spring pressure, and stable. Thus, an electrical connection state can be obtained.

  Reference numeral 200 denotes an opening / closing mechanism that is mounted on the opening / closing mechanism housing 4 and opens / closes the movable contact 22 of the movable contact 20 and the fixed contact 13 of the fixed contact 11 to open / close the power supply side circuit and the load side circuit. The opening / closing mechanism 200 includes a handle 201, a handle spring 202, a handle pin 203, a frame 204, a U pin 205, a lever 206, a trip bar 207, and a trip bar spring 208. .

  Next, assembly of the earth leakage breaker will be described. First, the hole 17d of the leaf spring 17 is fitted to the pin body 7 of the leaf spring accommodating portion 6 of the base body 2, and the hole 17e of the leaf spring 17 is fitted to the pin body 8 of the leaf spring accommodating portion 6 of the base body 2. Then, the plate springs 17 are respectively attached to the two plate spring storage portions 6 of the base body 2. A barrier 18 is disposed between the leaf springs 17, and the holes 18 a of the barrier 18 are fitted into the pin bodies 8 of the leaf spring accommodating portion 6.

  The power supply side terminal 12 of the fixed contact 11 is attached to the power supply side terminal mounting portion 9, and the driving rod 16 of the arc extinguishing device 15 is fitted into the hole 11 a formed in the fixed contact 11 to erase the fixed contact 11. While mounting the arc device 15, the driving rod 16 is also driven into the base body 2 to fix the fixed contact 11 to the base body 2. Either the fixed contact 11 or the leaf spring 17 may be attached first.

  Next, the leakage trip coil unit 300 is mounted on the circuit board 101 of the zero-phase current detection circuit unit 100 to which the zero-phase current transformer 102 is mounted above the zero-phase current transformer 102. In this way, by mounting the earth leakage tripping coil unit 300 on the upper side of the zero phase current transformer 102 on the same circuit board 101 as the zero phase current transformer 102, it is possible to reduce the size of the earth leakage breaker, It is possible to simplify the connection wiring as described above.

  The conductor 19 passes through the hollow portion of the zero-phase current transformer 102 of the zero-phase current detection circuit unit 100 and is fixed to one side of the movable contact 20 by the rivet 21, and the load-side terminal 14, the movable contact 20, Is connected. Further, the circuit board 101 of the zero-phase current detection circuit unit 100 equipped with the zero-phase current transformer 102 has a zero-phase current detection circuit in which the other side 17b of the leaf spring 17 is provided together with the load-side terminal 14 and the movable contact 20. It is inserted into the storage unit 5.

  In this way, the leakage tripping coil unit 300, the conductor 19, the load-side terminal 14, and the movable contact 20 are integrally configured on the circuit board 101 of the zero-phase current detection circuit unit 100 equipped with the zero-phase current transformer 102. The elastic force due to the U-shape of the other side 17b of the leaf spring 17 is applied to the circuit board 101 of the integrally configured zero-phase current detection circuit unit 100 in the zero-phase current detection circuit storage unit 5 formed in the base body 2. As a result, the circuit board 101 of the zero-phase current detection circuit unit 100 is pressed and inserted into a predetermined position. It should be noted that when the circuit board 101 of the integrally configured zero-phase current detection circuit unit 100 is inserted into the zero-phase current detection circuit storage unit 5 formed in the base body 2, the push plate 23 is attached to the movable contact 20. Is assembled.

  Further, the engagement pin 104 provided on the circuit board 101 of the zero-phase current detection circuit unit 100 is engaged with the engagement hole 17c serving as the engagement portion on the other side 17b of the leaf spring 17, thereby detecting the zero-phase current. The circuit board 101 of the circuit part 100 and the leaf | plate spring 17 will be in the state compressed by the spring pressure, and the stable electrical connection state can be obtained.

  Next, the opening / closing mechanism 200 including the handle 201, the handle spring 202, the handle pin 203, the frame 204, the U pin 205, the lever 206, the trip bar 207, and the trip bar spring 208 is opened and closed. It is attached to the mechanism unit storage unit 4. At this time, the leakage trip coil unit 300 is provided to face the trip bar 207, and the plunger 306 and the trip bar 207 of the leakage trip coil unit 300 are connected to the push plate 23.

  And the assembly of an earth-leakage circuit breaker is completed by attaching to the base body 2 so that each part may be covered with the cover body 3. FIG. As described above, the circuit breaker can be easily assembled by simply mounting the components on the base body 2 so as to be sequentially stacked, facilitating the assembly work of the components and simplifying the connection work. Can be obtained.

  Next, various operations will be described. First, the making operation will be described. When the handle 201 of the opening / closing mechanism 200 is inserted, the U pin 205 engaged with one end of the handle 201 is interlocked, and one end of the lever 206 engaged with one end of the U pin 205 is engaged with the trip bar 207. Thus, the fulcrum is positioned, and by rotating, the pusher plate 23 engaged with the lever 206 is pushed down, whereby the movable contact 20 is rotated in the clockwise direction, and the movable contact 22 is pressed against the fixed contact 13. Energization is possible. This ON state is shown in FIG.

  At this time, it is possible to supply power to the zero-phase current detection circuit unit 100 by pressing the leaf spring 17 by the operation of the movable contact 20, and further, when the opening / closing mechanism unit 200 is pushed, the movable contact 20 The circuit breaker is turned on by the U pin 205 and the handle 201 by the spring force of. Even when the power supply side and the load side of the circuit breaker are connected in reverse, power can be supplied to the zero-phase current detection circuit unit 100 in accordance with the opening and closing of the circuit breaker. That is, when the circuit breaker is open, power supply to the zero-phase current detection circuit unit 100 is interrupted, and when the circuit breaker is closed, power supply to the zero-phase current detection circuit unit 100 is performed.

  Next, the blocking operation will be described. When an overcurrent is generated, when the trip relay is activated by detecting the overcurrent of the zero-phase current detection circuit unit 100, the plunger 306 is sucked, and the trip bar 207 by the opening / closing mechanism unit 200 operates counterclockwise, whereby the lever 206 is operated. The movable contact 22 is largely separated from the fixed contact 13 by the spring force of the movable contact 20 and the restoring force of the handle spring 202. This trip state is shown in FIG.

  Thereafter, when the handle 201 is operated to the off position, the engagement position of the lever 206 and the trip bar 207 is pushed back to a position where the original operation is ensured, and can be turned on again. This OFF state is shown in FIG.

  In addition, since the main circuit and the zero-phase current detection circuit unit 100 are electrically connected by the leaf spring 17, a dedicated connecting member is not required, the number of parts can be reduced, and the parts are stacked and assembled. Costs can be reduced by eliminating the work process and facilitating assembly workability.

  Further, when the leaf spring 17 is disposed in both poles and the hole is provided in the leaf spring 17, the contact position with the engagement pin 104 of the zero-phase current detection circuit unit 100 is stabilized, and the cover body 3 is assembled. In addition, the leakage trip coil unit 300 and the plunger 306 mounted on the circuit board 101 of the zero-phase current detection circuit unit 100 are in a fixed position, and the tripping operation of the trip bar 207 is stabilized and the quality can be improved.

Embodiment 2. FIG.
A second embodiment of the present invention will be described with reference to FIG. FIG. 10 is a cross-sectional view showing an ON state in the leakage breaker according to Embodiment 2 of the present invention. The second embodiment corresponds to the overload short-circuit protection combined type in the first embodiment described above, and exhibits various effects similar to those in the first embodiment described above.

  In FIG. 10, the movable contact 20 is a composite material in which two materials of a high expansion material and a low expansion material for overload short circuit protection are bonded together, and three materials including a medium expansion material are bonded together. The bimetal 40 and the relay terminal 41 fixed to the base body 2 are pressed into contact with each other by a rivet 42. One end of a flexible conductor 43 is pressed against the bimetal 40. The other end of the flexible conductor 43 passes through the zero-phase current transformer 102 of the zero-phase current detection circuit unit 100 and is connected to the load side terminal 14 by being pressed together with the conductor 44 by the rivet 21. Other configurations are the same as those in the first embodiment described above, and thus the description thereof is omitted.

  The overload protection operation in the second embodiment will be described. When an overcurrent due to energization occurs, the bimetal 40, which is a composite material using the relay terminal 41 and the rivet 42 as a fulcrum, generates heat due to the overcurrent. Along with this heat generation, the bimetal 40 is displaced counterclockwise due to a difference in expansion coefficient of the material.

  Due to this displacement, the trip bar 207 is pushed by the bimetal 40, the engagement between the trip bar 207 and the lever 206 is disengaged, and the movable contact 22 becomes larger than the fixed contact 13 by the spring force of the movable contact 20 and the restoring force of the handle spring 202. To be separated. Since other operations are the same as those in the first embodiment described above, description thereof will be omitted.

  It should be noted that within the scope of the present invention, the embodiments can be freely combined, or the embodiments can be appropriately modified or omitted.

  According to the present invention, the circuit board on which the zero-phase current transformer of the zero-phase current detection circuit unit is mounted is provided with the leakage trip coil unit connected to the switching mechanism unit, thereby facilitating the assembly workability of the parts. It is suitable for realizing an earth leakage circuit breaker capable of simplifying the connection work.

  DESCRIPTION OF SYMBOLS 1 Case, 2 base body, 3 cover body, 11 fixed contact, 13 fixed contact, 17 leaf spring, 17a one side, 17b other side, 17c engaging part, 20 movable contact, 22 movable contact, 40 bimetal, DESCRIPTION OF SYMBOLS 100 Zero phase current detection circuit part, 101 Circuit board, 102 Zero phase current transformer, 104 Engagement part, 200 Opening-closing mechanism part, 300 Earth leakage trip coil part

Claims (6)

  A casing having a base body and a cover body, a fixed contact having a fixed contact attached to the base body of the casing, and a movable having a movable contact that is brought into and out of contact with the fixed contact of the fixed contact A contactor; an opening / closing mechanism that opens and closes the movable contact of the movable contact and the fixed contact of the fixed contact to open and close a power supply side electric circuit and a load side electric circuit; and the base body of the housing A zero-phase current detection circuit unit composed of a circuit board and a zero-phase current transformer attached to the circuit board, and the zero-phase current transformer of the zero-phase current detection circuit unit is installed An earth leakage circuit breaker comprising an earth leakage tripping coil portion mounted on the circuit board and connected to the opening / closing mechanism portion.   The earth leakage circuit breaker according to claim 1, wherein the earth leakage tripping coil part is provided to face a trip bar of the opening / closing mechanism part.   The base body of the housing is provided with a leaf spring formed in a shape having one side in contact with the movable contact and the other side having elasticity, and the zero-phase current detection is performed by the elastic force of the other side of the leaf spring. The earth leakage circuit breaker according to claim 1 or 2, wherein the circuit board of the circuit unit is press-contacted and inserted into the base body of the housing.   The engagement portion that engages with the engagement portion is provided on the circuit board of the zero-phase current detection circuit portion, wherein an engagement portion is provided on the other side of the leaf spring. Earth leakage circuit breaker.   The engagement portion provided on the other side of the leaf spring is an engagement hole, and the engagement portion provided on the circuit board of the zero-phase current detection circuit portion is an engagement pin. The earth leakage circuit breaker according to claim 4. 6. The earth leakage breaker according to claim 1, further comprising a bimetal for overload short circuit protection.

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