CN108987194B - Circuit breaker and safety device unit of circuit breaker - Google Patents
Circuit breaker and safety device unit of circuit breaker Download PDFInfo
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- CN108987194B CN108987194B CN201810105527.9A CN201810105527A CN108987194B CN 108987194 B CN108987194 B CN 108987194B CN 201810105527 A CN201810105527 A CN 201810105527A CN 108987194 B CN108987194 B CN 108987194B
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- circuit breaker
- opening
- housing
- actuator
- safety device
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/02—Housings; Casings; Bases; Mountings
- H01H71/0207—Mounting or assembling the different parts of the circuit breaker
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- Breakers (AREA)
- Switch Cases, Indication, And Locking (AREA)
Abstract
A safety device configured such that a safety device unit is detachably attached, the safety device unit comprising: an actuator which is pre-tightened by an elastic component to a direction for operating a tripping device of the circuit breaker; and a lever configured to be able to protrude from the bottom surface of the base by a biasing force from the actuator, and configured to lock the actuator at a position where the trip device does not operate in a state where the protrusion is pushed back.
Description
Technical Field
The present invention relates to a circuit breaker such as a wiring breaker or an earth leakage breaker, and more particularly to a safety device for automatically tripping a circuit breaker to prevent dangerous work in a live line state.
Background
In a plug-in connection system called a circuit breaker, there is a need for a safety device (SAFETYDEVICE) that senses the lifting of a mounting plate and trips because there is a risk of electric shock, arc discharge, and the like in a work such as detaching a main body in a live state.
In the surface type connection method, since a terminal screw as a conductive portion is located near an operation handle of a circuit breaker, a shield plate called a decorative plate protects the wire connection portion in a normal distribution board.
As a means for detecting the lifting of the main body and tripping the main body, there is, for example, a means in which an opening is provided in a bottom surface of a housing of the circuit breaker and a safety device is inserted into the opening, the safety device including: a lever that moves when the circuit breaker is detached from the attachment fixing portion thereof; and an actuator that is integrally assembled with the lever and operates the opening and closing mechanism in accordance with the lever (see, for example, patent document 1).
Patent document 1: japanese laid-open patent publication No. 8-185782 (FIG. 2)
In the conventional circuit breaker, it is necessary to provide an opening in the bottom surface of the circuit breaker and to secure a space for disposing the lever and the actuator inside.
Further, there is a problem that insulation is secured around the opening portion of the bottom surface, and it is difficult to take measures against airtightness at the time of circuit breaking, and breaking performance as a circuit breaker is lowered.
Disclosure of Invention
The present invention has been made to solve the above problems, and relates to a structure in which a function of a safety device is added while avoiding a change in the interior of a circuit breaker.
The circuit breaker according to the present invention comprises: a frame body; an opening/closing contact for opening/closing an electric circuit; an opening/closing mechanism for driving the opening/closing contact; and a trip device which operates the opening and closing mechanism in response to an overcurrent, the circuit breaker being characterized in that a safety device unit for performing circuit trip is detachably provided in the housing, the safety device unit including: an actuator which is pre-tensioned by an elastic component to a direction of operating the tripping device; and a lever configured to be able to protrude from the housing to the outside by a biasing force from the actuator, and configured to lock the actuator at a position where the trip device does not operate in a state where the lever does not protrude from the housing to the outside.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, a circuit breaker can be obtained in which a safety device for operating a trip device is removably attached to a base or a cover without modifying a bottom portion or an opening/closing mechanism portion of the circuit breaker by sensing a lift of a mounting plate from the circuit breaker (including a lift of a terminal block when a connection form from the circuit breaker is a plug-in type) (and also including a lift of a decorative plate for detecting a lift of a wiring covering the circuit breaker).
In addition, in the circuit breaker which is suitable for the assembly and disassembly of the voltage tripping device, the housing space of the voltage tripping device and the groove for wiring the lead are arranged in the frame body of the circuit breaker such as a base, a cover and the like, so the external dimension of the circuit breaker of the invention is not increased compared with the prior structure.
Drawings
Fig. 1 is a perspective view of a circuit breaker according to embodiment 1 of the present invention.
Fig. 2 is a side view of the circuit breaker according to embodiment 1 of the present invention.
Fig. 3 is a plan view of the circuit breaker according to embodiment 1 of the present invention.
Fig. 4 is a perspective view of the circuit breaker according to embodiment 1 of the present invention in a state where the upper cover is opened.
Fig. 5 is a perspective view of the circuit breaker according to embodiment 1 of the present invention in a state where the safety device unit is removed.
Fig. 6 is a plan view of the circuit breaker according to embodiment 1 of the present invention in a state where the upper cover is opened.
Fig. 7 is a perspective view showing the interior of the circuit breaker and the components in the safety device unit according to embodiment 1 of the present invention.
Fig. 8 is a side view showing a state after normal mounting of the circuit breaker according to embodiment 1 of the present invention.
Fig. 9 is a side view showing a state in which a lower lever of a circuit breaker according to embodiment 1 of the present invention is projected.
Fig. 10 is a diagram showing a lower lever of a circuit breaker according to embodiment 1 of the present invention.
Fig. 11 is a diagram showing an actuator of a circuit breaker according to embodiment 1 of the present invention.
Fig. 12 is a perspective view of a circuit breaker according to embodiment 2 of the present invention.
Fig. 13 is a side view of a circuit breaker according to embodiment 2 of the present invention.
Fig. 14 is a perspective view of the circuit breaker according to embodiment 2 of the present invention in a state where the upper cover is opened.
Fig. 15 is a perspective view of the circuit breaker according to embodiment 2 of the present invention in a state where the safety device unit is removed.
Fig. 16 is a plan view of the circuit breaker according to embodiment 2 of the present invention in a state where the upper cover is opened.
Fig. 17 is a perspective view showing the interior of the circuit breaker and the components in the safety device unit according to embodiment 2 of the present invention.
Fig. 18 is a side view showing a state in which a decorative plate of a circuit breaker according to embodiment 2 of the present invention is normally attached.
Fig. 19 is a side view showing a state in which an upper lever of a circuit breaker according to embodiment 2 of the present invention is protruded.
Fig. 20 is a diagram showing an upper lever of a circuit breaker according to embodiment 2 of the present invention.
Fig. 21 is an explanatory diagram for explaining a reset operation of the circuit breaker according to embodiment 3 of the present invention.
Fig. 22 is a diagram showing a trip state of the circuit breaker according to embodiment 3 of the present invention.
Description of the reference numerals
1 base, 2 cover, 2a cover guide groove, 3 upper cover, 4 operating handle, 4a handle protrusion, 5 lower rod, 5a inclined plane, 5b protrusion, 5c lower end, 6 safety device unit, 7 actuator, 7a actuator lower end, 7b working part, 7c horizontal part, 8 elastic component, 9 trip device, 10 frame body, 11 pin, 12 upper rod, 12a clamping part, 12b protrusion, 12c upper end, 13 reset rod, 13a driving part, 14 latch key
Detailed Description
Fig. 1 to 11 show an example of a circuit breaker according to embodiment 1 of the present invention or a component diagram thereof.
First, the above drawings will be explained. Fig. 1 is an oblique view of a circuit breaker of embodiment 1, fig. 2 is a side view of the circuit breaker, fig. 3 is a plan view of the circuit breaker, fig. 4 is an oblique view of the circuit breaker in a state where the upper cover is opened, fig. 5 is an oblique view of the circuit breaker in a state where the safety device unit 6 is removed, fig. 6 is a plan view of the circuit breaker in a state where the upper cover 3 is opened, fig. 7 is a perspective view showing components in the circuit breaker and in the safety device unit, fig. 8 is a side view showing a state after the circuit breaker is normally mounted, fig. 9 is a side view showing a state in which the lower lever 5 of the circuit breaker is protruded, fig. 10 is a view (oblique view, front view, and side view) showing the lower lever 5 of the circuit breaker, and fig. 11 is a view (oblique view, front view, and side view) showing the actuator 7 of the circuit breaker. Hereinafter, the upper lever and the lower lever, which will be described later, will be collectively referred to as a lever.
The circuit breaker according to embodiment 1 includes, as its component parts, a base 1, a cover 2, a housing constituted by an upper cover 3 and the like, which are made of an insulating material, an operation handle 4, a lever (specifically, a lower lever 5), and the like (see fig. 1 to 3).
The circuit breaker includes a safety device unit 6 therein (see fig. 4). As is apparent from fig. 5, which is a perspective view of the circuit breaker with the safety device unit 6 removed, a cover guide groove 2a (see fig. 5) is provided on a side surface of the cover 2, and the safety device unit 6 is attached by the cover guide groove 2 a.
Next, the structure and operation of the opening and closing mechanism of the circuit breaker will be described below with reference to fig. 6 to 11.
The opening/closing mechanism is an actuator 7 (see fig. 6 to 9) which is in direct contact with a trip device for changing from a normal operation, i.e., an on operation, to a trip operation. At this time, the actuator 7 is rotated by the elastic member 8 about a fixed position on the housing 10 as a rotation fulcrum, thereby changing the position (see fig. 7).
In this case, as shown in fig. 8, the actuator 7 is rotatably attached to the housing 10 by a pin 11.
In the above, the elastic member 8 biases the actuator 7 clockwise. The actuator 7 contacts the inclined surface 5a of the lower rod 5 at the actuator lower end portion 7a, and biases the lower rod 5 obliquely downward (see fig. 9 to 11). Further, a projection 5b guided by the cover guide groove 2a is provided on the side surface of the lower lever 5, and displacement in the other vertical direction is restricted by the cover guide groove 2a (see fig. 8 and 10).
When the circuit breaker is normally mounted to the terminal block in the case where the connection type is the plug-in type, and when the circuit breaker is normally mounted to the mounting plate in the case where the connection type is the surface type or the back type, as shown in fig. 8, the lower end portion 5c of the lever (specifically, the lower lever 5) is designed not to protrude downward of the base 1, and therefore, the actuator 7 cannot be further rotated, and the operating portion 7b of the actuator 7 does not come into contact with the trip device 9.
Next, the structure and operation related to the trip operation will be described below with reference to fig. 9 to 11.
Fig. 9 shows a state in which the circuit breaker is lifted up by removal or the like and the lever (specifically, the lower lever 5) is protruded, and at this time, the inclined surface 5a of the lower lever 5 is moved downward, and the actuator lower end portion 7a is moved clockwise, and the operating portion 7b presses the trip device 9, whereby the circuit breaker trips and the open/close contacts are separated.
As a result, even when the circuit breaker is in the energized state, the load side is not conducted, and dangerous work can be avoided.
In fig. 10, fig. 10(c) is a perspective view of the lower lever 5, fig. 10(a) is a front view of the lower lever 5, and fig. 10(b) is a side view of the lower lever 5. In fig. 11, fig. 11(c) is a perspective view of the actuator 7, fig. 11(a) is a front view of the actuator 7, and fig. 11(b) is a side view of the actuator 7.
Fig. 12 to 22 show an example of a circuit breaker according to embodiment 2 of the present invention or a component diagram thereof.
Fig. 12 is a perspective view of the circuit breaker according to embodiment 2, fig. 13 is a side view thereof, fig. 14 is a perspective view of a state in which an upper cover 3 is opened, fig. 15 is a perspective view of a state in which a safety device unit 6 is removed, fig. 16 is a plan view of a state in which an upper cover is opened, fig. 17 is a perspective view showing components in the circuit breaker and in the safety device unit, fig. 18 is a side view showing a state in which a decorative plate serving as an upper shielding surface of the cover is normally attached, fig. 19 is a side view showing a state in which an upper lever is protruded, and fig. 20 is a view showing the upper lever.
In embodiment 1, the safety device unit in the case where the rear surface of the circuit breaker is mounted on the panel surface is shown, but in this embodiment, the safety device unit in the case where the lift of a decorative plate (not shown) covering the wiring of the circuit breaker is detected will be described below.
In the circuit breaker according to the present embodiment, an upper lever 12 (see fig. 12 to 17) is used instead of the lower lever described in embodiment 1.
The actuator 7 is in contact with the engagement portion 12a of the upper rod 12 at the horizontal portion 7c, and biases the upper rod 12 upward (see fig. 18).
A projection 12b guided by the cover guide groove 2a is provided on the side surface of the upper rod 12, and displacement in the vertical direction is restricted by the cover guide groove 2a (see fig. 18).
Further, when the circuit breaker is normally mounted with the decorative plate (not shown), the upper end portion 12c of the lever (specifically, the upper lever 12) cannot project upward, and therefore the actuator 7 cannot be further rotated, and the operating portion 7b of the actuator 7 does not come into contact with the trip device 9 (see fig. 18).
Fig. 19 shows a state where a decorative plate (not shown) of the circuit breaker is opened and a rod (specifically, the upper rod 12) protrudes upward, and at this time, the engaging portion 12a moves upward, and the horizontal portion 7c of the actuator 7 rotates clockwise, and the operating portion 7b of the actuator 7 presses the trip device 9.
Thus, the circuit breaker is tripped, and even when the circuit breaker is in the energized state, the load side is not conducted, and thus dangerous work can be avoided.
Fig. 20 is a view showing the upper lever, fig. 20(c) is a perspective view of the upper lever, fig. 20(a) is a front view thereof, and fig. 20(b) is a side view thereof.
Fig. 21 is an explanatory diagram for explaining a reset operation of the circuit breaker according to embodiment 3 of the present invention, and fig. 22 is a diagram showing a trip state of the circuit breaker.
In the present embodiment, the operation handle 4 is provided with a handle boss 4a that engages with the return lever 13.
Next, the reset operation of the circuit breaker will be described with reference to fig. 21 and 22. Fig. 21 shows a case where the operation handle 4 is in the position of the "on state". As shown in the figure, the operation handle 4 is provided with a handle boss 4a engaged with the reset lever 13, and the reset lever 13 is provided with a driving portion 13a abutting against the actuator 7.
Further, the actuator 7 can be moved to the reset position not in contact with the trip device 9 by an operation (off operation) of manually moving the operation handle 4 from the trip state shown in fig. 22 (in this case, the position of the operation handle 4 is at the position indicated by the solid line: Tp) to a position where the position of the operation handle 4 is indicated by the broken line (a reset position described later: same as Tr).
At this time, by arranging the latch 14 biased in the direction of locking the reset lever 13, the actuator 7 is also locked in the reset position together with the reset lever 13 after the operation handle 4 is moved to the on side (see the operation handle position shown in fig. 21).
By configuring such that the upper lever 12 urged upward is engaged with the latch and the latch release direction and the reset lever urging direction are close to 90 °, the load pushed back to prevent the lever (specifically, the upper lever 12 here) from protruding can be made smaller than the load required for driving the trip device.
In a normal circuit breaker, the cover guide groove 2a of fig. 5 is provided in the cover 2 so as to be able to fix the terminal block of the accessory, but the lower pole 5 or the upper pole 12 is provided with the projection 5b or the projection 12b, respectively, so that the drop-out and the displacement can be prevented, and the safety device unit can be mounted without increasing the outer dimension in the width direction.
In addition, in a general circuit breaker, although a space for housing the accessory device is provided in the cover or the base, the safety device unit is configured to be housed in the housing space, so that the external dimension of the circuit breaker does not increase even after the circuit breaker is mounted.
In addition, in a general circuit breaker, since the circuit breaker is electrically tripped according to a command from a remote place, that is, a place separated from the circuit breaker, a voltage trip device (also referred to as a Shunt trip (SHT)), which is an internal device, can be installed, but by setting the operating part 7b of the actuator 7 of the safety device unit to the same shape as the operating part of the voltage trip device, the safety device unit can operate without changing the specification of the trip device of the circuit breaker.
Further, by providing the actuator 7 with an actuator lower end portion 7a as an engaging portion with the lower lever 5 and a horizontal portion 7c (see fig. 11) as an engaging portion with the upper lever 12, the other components of the safety device unit 6 are shared, and thus the safety device unit can cope with both tilting of the circuit breaker and opening of the decorative panel only by replacing the lower lever 5 and the upper lever 12.
The present invention can freely combine the respective embodiments within the scope of the invention, and can appropriately modify or omit the respective embodiments.
Claims (9)
1. A circuit breaker, having: a frame body; an opening/closing contact for opening/closing an electric circuit; an opening/closing mechanism for driving the opening/closing contact; and a trip device which operates the opening and closing mechanism in response to an overcurrent,
the circuit breaker is characterized in that it is provided with,
a safety device unit for circuit tripping is detachably provided by a cover guide groove provided on a side surface of the housing, and the safety device unit includes:
an actuator biased by an elastic member in a direction to operate the trip device; and
and a lever configured to be able to protrude from the housing to the outside by a biasing force from the actuator, and configured to lock the actuator at a position where the trip device does not operate in a state where the lever does not protrude from the housing to the outside.
2. The circuit breaker of claim 1,
the rod is configured to be able to protrude from a bottom surface of the housing when the rod is a lower rod, and configured to protrude from an upper shielding surface of the housing when the rod is an upper rod.
3. A circuit breaker, having: a frame body; an opening/closing contact for opening/closing an electric circuit; an opening/closing mechanism for driving the opening/closing contact; and a trip device which operates the opening and closing mechanism in response to an overcurrent,
the circuit breaker is characterized in that it is provided with,
a safety device unit for tripping a circuit is detachably provided in the housing, and the safety device unit includes:
an actuator biased by an elastic member in a direction to operate the trip device;
a reset lever that drives the actuator to a reset position where the trip device is not operated by a disconnection operation of an operation handle of the opening and closing mechanism;
a latch for latching the reset lever to a reset position; and
and a lever configured to be able to protrude from an upper shielding surface of the housing by a biasing force from the actuator, and configured to drive the latch to release the latching of the reset lever when protruding from the upper shielding surface of the housing.
4. The circuit breaker according to any one of claims 1 to 3,
a guide groove for moving the safety device unit is provided on a side surface of the frame body, and the lever has a projection configured to correspond to the guide groove.
5. The circuit breaker according to any one of claims 1 to 3,
a space for housing the safety device unit is provided on an upper surface, a side surface, or an inside of the housing.
6. The circuit breaker of claim 5,
the space of the housing for accommodating the safety device unit can be shared with a space for accommodating a voltage trip device for electrically tripping the circuit breaker in accordance with a command from a position separated from the circuit breaker.
7. A safety device unit of a circuit breaker, which is used in the circuit breaker, the circuit breaker having: a frame body; an opening/closing contact for opening/closing an electric circuit; an opening/closing mechanism for driving the opening/closing contact; and a trip device which operates the opening and closing mechanism in response to an overcurrent,
the safety device unit of the circuit breaker is characterized in that,
the circuit breaker is configured to be detachable by a cover guide groove provided on a side surface of the housing, and includes:
an actuator biased by an elastic member in a direction to operate the trip device; and
and a lever configured to be able to protrude from the housing by a biasing force from the actuator, and configured to lock the actuator at a position where the trip device does not operate in a state where the lever does not protrude from an outermost surface of the circuit breaker.
8. The safety device unit of a circuit breaker according to claim 7,
the rod is configured to be able to protrude from a bottom surface of the housing when the rod is a lower rod, and configured to protrude from an upper shielding surface of the housing when the rod is an upper rod.
9. The safety device unit of a circuit breaker according to claim 8,
the actuator has both a portion engaged with the lower rod and a portion engaged with the upper rod, and is configured to be able to attach the lower rod or the upper rod.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017107349A JP6842999B2 (en) | 2017-05-31 | 2017-05-31 | Circuit breaker and circuit breaker safety device unit |
| JP2017-107349 | 2017-05-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108987194A CN108987194A (en) | 2018-12-11 |
| CN108987194B true CN108987194B (en) | 2020-03-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810105527.9A Active CN108987194B (en) | 2017-05-31 | 2018-02-02 | Circuit breaker and safety device unit of circuit breaker |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6842999B2 (en) |
| CN (1) | CN108987194B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110071452A (en) * | 2019-05-24 | 2019-07-30 | 辽宁电能发展股份有限公司 | A kind of low pressure draw-out type breaker |
| CN114496664B (en) * | 2021-12-20 | 2024-01-19 | 深圳供电局有限公司 | Circuit breaker device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4950848A (en) * | 1989-09-22 | 1990-08-21 | Westinghouse Electric Corp. | Adjustable circuit breaker with draw out interlock |
| JPH08185782A (en) * | 1994-12-28 | 1996-07-16 | Mitsubishi Electric Corp | Circuit breaker |
| CN102651292A (en) * | 2011-02-22 | 2012-08-29 | Ls产电株式会社 | Circuit breaker |
| CN104037028A (en) * | 2013-03-06 | 2014-09-10 | 西门子公司 | Autotrip Plunger Of Circuit Breaker And Circuit Breaker |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3266221B2 (en) * | 1993-08-10 | 2002-03-18 | 富士電機株式会社 | Terminal cover device for electrical equipment |
| JP6425061B2 (en) * | 2014-07-30 | 2018-11-21 | 株式会社コエックス | Automatic reset type breaker |
| CN104701105B (en) * | 2015-03-05 | 2016-08-24 | 上海德布森电气有限公司 | A kind of safety release auxiliary device for plug in circuit breaker |
-
2017
- 2017-05-31 JP JP2017107349A patent/JP6842999B2/en active Active
-
2018
- 2018-02-02 CN CN201810105527.9A patent/CN108987194B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4950848A (en) * | 1989-09-22 | 1990-08-21 | Westinghouse Electric Corp. | Adjustable circuit breaker with draw out interlock |
| JPH08185782A (en) * | 1994-12-28 | 1996-07-16 | Mitsubishi Electric Corp | Circuit breaker |
| CN102651292A (en) * | 2011-02-22 | 2012-08-29 | Ls产电株式会社 | Circuit breaker |
| CN104037028A (en) * | 2013-03-06 | 2014-09-10 | 西门子公司 | Autotrip Plunger Of Circuit Breaker And Circuit Breaker |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108987194A (en) | 2018-12-11 |
| JP2018206497A (en) | 2018-12-27 |
| JP6842999B2 (en) | 2021-03-17 |
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