JP3407017B2 - Circuit breaker - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for discharging arc gas generated inside a housing of a circuit breaker to the outside of the housing. In particular, the present invention relates to an insulating barrier attaching / detaching means. 2. Description of the Related Art FIG.
FIG. 1 is a partial cross-sectional view of a conventional circuit breaker shown in Japanese Unexamined Patent Application Publication No. H10-115,004. In the drawing, reference numeral 1 denotes a base, and 2 denotes a cover, each of which is formed of a synthetic resin material having excellent insulation properties, and constitutes a housing of a circuit breaker. Reference numeral 3 denotes an operation handle for manual on / off operation. Reference numeral 4 denotes an open / close operation performed by an opening / closing mechanism (not shown), and a movable contact for turning on / off a current flowing through the circuit breaker; 5, an arc extinguishing device for extinguishing an arc generated when the current is interrupted; Terminal 7 is a load side terminal. Reference numerals 8 and 9 denote surface connection conductors. The surface connection conductor 8 is attached to the power supply side terminal 6, and the surface connection conductor 9 is attached to the load side terminal 7 by terminal tightening screws 10.
Each is led out of the circuit breaker and connected to an external wiring conductor. Reference numeral 11 denotes a partition plate that partitions between the arc extinguishing device 5 and the power supply terminal 6. [0003] Reference numeral 12 denotes an insulating barrier in which a large number of ventilation holes are provided in a rectangular insulating plate. The insulating barrier is provided for each pole in the power supply terminal 6 and the load terminal 7. That is,
The outer edges of the insulating barrier 12 are inserted into support grooves 1a, 2a provided in the openings 21 of the outer wall of the base 1 and the cover 2 for each pole, so that the cover 2 cannot be removed in a state where the cover 2 is attached to the base 1. It is supported by. Through this insulating barrier 12, the arc gas generated inside the housing (base 1, cover 2) is discharged to the outside of the housing. FIG. 9 is a partial cross-sectional view of the circuit breaker shown in FIG. In the figure, 1
7, 10 and 11 are the same as above. 13 is a back connection stud and 14 is an insulating barrier. Modification to the back side connection type is performed by removing the front side connection conductors 8 and 9 and attaching the back side connection studs 13 to the power supply side terminal 6 and the load side terminal 7 with the terminal tightening screws 10. As described above, when remodeling from the front connection type to the back connection type, the cover 2 is removed, the front connection conductors 8 and 9 are replaced with the back connection studs 13, and at the same time, the insulating barrier 12 is replaced with the insulating barrier 14 Replace with This insulating barrier 12 is replaced by the insulating barrier 12 from the surface connection conductor 8,
The insulating barrier 14 is made longer by the thickness of 9 so as to close the gap created by removing the surface connecting conductors 8 and 9 so that the charged portion is not exposed. That is, the front connection conductors 8 and 9 are connected to the back connection studs 13 and the insulation barrier 12 is connected to the insulation barrier 1.
After the replacement, the cover 2 is attached to complete the remodeling operation. In recent years, in consideration of such a change in connection type and modification, a base 1 is provided with a backside stud mounting hole 1b in advance, and a screwdriver insertion hole 2b is formed in the cover 2 in advance. Some are provided. like this,
In the circuit breaker provided with the backside stud mounting hole 1b and the screwdriver insertion slot 2b, the front connection conductors 8 and 9 can be exchanged for the back connection stud 13 without removing the cover 2, but the charged portion is exposed. Insulation barrier 1 for eliminating noise
Replacing the cover 2 with the insulating barrier 14 requires removal of the cover 2. The operation for replacing the insulating barrier 14 with the insulating barrier 12 is the same. In the modification of the connection type of the circuit breaker as described above, since the cover 2 cannot be removed by a general user, the modification has to be performed by a factory or a designated contractor. Therefore, delivery problems or distribution problems often occur. SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and in the case of modifying the connection type, there is provided a circuit breaker which allows replacement of an insulating barrier without removing a cover. The purpose is to get. [0008] [Means for Solving the Problems A circuit breaker according to the present invention comprises a power source side terminal and load side terminal, provided for screwing a surface connection conductor or the back connection stud to the both terminals A housing for covering the terminal and the terminal tightening screw together with the terminal fastening screw and the internal element; and a flexible insulation removably attached to the opening of the housing near the both terminals. A barrier, a screwdriver insertion hole formed in the housing for turning the terminal tightening screw, and the screw
Provided in the housing adjacent to the insertion slot,
And an insulating barrier detachable groove hole capable of inserting the rear, by deflecting the insulating barrier, the absolute
The insulating barrier can be detached and replaced from the edge barrier attaching / detaching slot. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment 1 is a partial cross-sectional view of a circuit breaker of a surface connection type showing a first embodiment of the present invention, FIG. 2 is a top view of FIG. 1, FIG. 3 is a partial cross-sectional view taken along line AA of FIG. 4 is a diagram for explaining the removal of the insulation barrier of the surface connection type circuit breaker, and FIG. 5 is a partial sectional view of the back connection type circuit breaker and an explanatory diagram for explaining the mounting of the insulation barrier. In the drawing, 1 is a base, 1b is a back stud mounting hole, 2 is a cover, 2b is a screwdriver insertion slot, and 3 is an operation handle. 4 is a movable contact, 5 is an arc extinguishing device, 6 is a power supply terminal, load terminal 7 is not shown, 8 is a surface connection conductor, 8 is a surface connection conductor on the load terminal side, and 10 is a terminal. Tightening screw, 11 is a partition plate, 12 is a flexible insulating barrier disposed in the opening 21 of the housing when using the surface connection conductors 8 and 9, 13 is a back connection stud, 14 is a back connection When the stud 13 is used, the insulating barrier has flexibility and is disposed in the opening 21 of the housing. In the above configuration, reference numeral 2c denotes an insulating barrier attaching / detaching slot, which is located above the power supply terminal 6 and the load terminal 7 of the cover 2 and adjacent to the screw insertion slot 2b for each pole, and The insulating barrier 12 is provided in such a manner that the insulating barrier 12 can be inserted in a cross section of a plate thickness with the width direction of the circuit breaker as a longitudinal direction. The longitudinal center line of the insulating barrier attaching / detaching slot 2c is shifted from the center line of the support groove 1a in which the insulating barrier 12 is supported. The support groove 2a on the cover 2 side is closer to the outer surface of the circuit breaker than the support groove 1a.
Although formed on the same line as the groove edge of a, the groove edge on the inner side of the circuit breaker is inside the insulating barrier attaching / detaching slot 2c. Therefore, the insulating barrier 12 can be inserted or removed through the inside of the insulating barrier attaching / detaching slot 2c as described later. The screwdriver insertion opening 2b, the insulating barrier attaching / detaching slot 2c, and the insulating barrier 12 described above are also provided on the load-side terminal (not shown). Next, the procedure for changing the connection type of the circuit breaker having the above configuration (change of the front connection conductor 8 and the back connection stud 13) will be described. First, as shown in FIG. 4, the insulating barrier 12 is pushed in from the outside of the circuit breaker with a tool such as a screwdriver, and the tip of the insulating barrier 12 is deflected to face the insulating barrier attaching / detaching slot 2c. In this state, the insulating barrier 12 is lifted in the direction of the arrow to remove the insulating barrier 12 from the insulating barrier attaching / detaching slot 2c. Subsequently, the terminal fastening screw 10 is loosened by a screwdriver inserted from the screwdriver insertion slot 2b, the front connection conductor 8 is removed, and the back connection stud 13 is replaced.
Then, as shown in FIG. 5, the insulating barrier 14 is inserted into the supporting groove 1a from the insulating barrier attaching / detaching slot 2c. Since the center lines of the insulating barrier attaching / detaching slot 2c and the supporting groove 1a are shifted, the insulating barrier 14 is inserted while being bent and deformed. When the insertion is completed, the insulating barrier 14 is supported along the supporting groove 1a by its own elastic recovery. It comes into contact with the groove 2a and is retained. In addition,
The insulation barrier 1 is also provided at the load-side terminals in the same manner as described above.
2 can be replaced with an insulating barrier 14. As described above, the screw insertion slot 2 is
b and the insulating barrier attaching / detaching slot 2c are provided, and the insulating barrier 12 can be replaced with the insulating barrier 14 through the insulating barrier attaching / detaching slot 2c. Therefore, when the connection type of the circuit breaker is changed, the cover 2 is removed. It is possible to replace and remove the insulation barrier without any problem. Therefore, the connection type can be modified at the construction site or at the user, and the convenience in terms of delivery and distribution can be improved. According to this embodiment, since the insulating barriers 12, 14 are held by the support grooves 1a, 2a formed on the inner surfaces of the base 1 and the cover 2, even when the high-pressure exhaust gas is received, the insulating barriers 12, 14 are retained. Anxiety such as dropping is eliminated. Embodiment 2 FIG. FIG. 6 shows a second embodiment of the present invention, and is a front view of an insulating barrier portion in a circuit breaker of a backside connection type, and FIG. 7 is an explanatory diagram for explaining attachment and detachment of the insulating barrier.
In the figure, reference numerals 1 to 14 are the same as those described in the first embodiment. In this configuration, the base 1 is provided with a support groove 1 a for supporting the insulating barrier 14. The cover 2 lacks the edge of the support groove communicating with the support groove 1a on the outer surface side of the insulation barrier mounting surface of the circuit breaker, and has an insulation barrier insertion window 2d wider than the width of the insulation barrier 14. Will be. Therefore, in the portion of the insulating barrier insertion window 2d, the insulating barrier 14 can be bent from the inside and pushed out to the outside of the circuit breaker. Next, a procedure for changing the connection type of the circuit breaker according to the second embodiment having the above configuration will be described. As shown in FIG. 7, the insulating barrier 14 is pushed out from the screw insertion slot 2b with a tool such as a screwdriver, and the distal end of the insulating barrier 14 is bent so that the insulating barrier 14 projects from the end surface of the circuit breaker. Pull out. Subsequently, the terminal tightening screw 10 is inserted by the screwdriver inserted from the screwdriver insertion slot 2b.
To remove the back connection stud 13 and replace it with the front connection conductor 8. Then, the insulating barrier 12 is inserted in the direction of the arrow through the insulating barrier insertion window 2d. During this insertion, the insulating barrier 12 is inserted while being deformed, but when the insertion is completed, the rear end of the insulating barrier 12 abuts the cover 2 along the support groove 1a due to elastic recovery, and is retained and retained. In this manner, the screw insertion slot 2 is
b and the base 1 are provided with support grooves 1a, and the support grooves 1 of the cover 2 are provided.
Insulating groove 1 on the outer surface side of the circuit breaker in the extension of a
It is possible to replace the insulating barrier 12 with the insulating barrier 14 or the insulating barrier 14 with the insulating barrier 12 through the insulating barrier insertion window 2d which is wider than the insulating barriers 2 and 14. Therefore, when changing the connection type of the circuit breaker, it is not necessary to remove the cover, and it is possible to modify the connection type at the construction site or at the user, and it is possible to improve delivery time and convenience in distribution. In the above-described configuration, the mounting and dismounting of the insulation barriers 12 and 14 is performed from the upper surface side of the circuit breaker. It is. Since the present invention is configured as described above, it has the following effects. A slot for attaching and detaching the insulation barrier is provided for each pole so that the insulation barrier can be inserted into the housing adjacent to the screwdriver insertion slot, so that the insulation barrier can be attached and detached without removing the cover. in-out, even under exhaust gas of a high pressure does not cause problems such as isolation barrier to fall off.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial cross-sectional view of a surface-connection type circuit breaker showing Embodiment 1 of the present invention. FIG. 2 is a top view of the circuit breaker according to the first embodiment of the present invention. FIG. 3 is a partial sectional view taken along line AA of FIG. 1; FIG. 4 is an explanatory diagram showing removal of an insulating barrier according to the first embodiment of the present invention. FIG. 5 is a partial cross-sectional view of the backside connection type circuit breaker of the present invention, and is an explanatory view showing mounting of an insulating barrier. FIG. 6 is a front view of a part of an insulating barrier of a circuit breaker of a back surface connection type according to a second embodiment of the present invention. FIG. 7 is an explanatory diagram showing attachment and detachment of an insulating barrier according to a second embodiment of the present invention. FIG. 8 is a partial sectional view showing a conventional circuit breaker. FIG. 9 is a partial cross-sectional view showing a conventional circuit breaker, which is modified into a backside connection type. [Description of Signs] 1 Base, 1a, 2a Support groove, 2 cover, 2b
Screwdriver insertion slot, 2c Slot for attaching / detaching insulating barrier, 2d
Insulation barrier insertion window hole, 3 operation handle, 6 power supply side terminal, 7 load side terminal, 8, 9 surface connection conductor, 10
Terminal tightening screw, 12, 14 Insulation barrier, 13 Back connection stud.

Claims (1)

(1) A power supply side terminal and a load side terminal, a terminal tightening screw provided for screwing a surface connection conductor or a back surface connection stud to the both terminals, and an internal terminal. A housing for covering both the terminal and the terminal tightening screw together with the element; a flexible insulating barrier removably attached to the opening of the housing in the vicinity of the both terminals; a screwdriver insertion opening bored in the housing in order to turn the screw, on
Provided in the housing adjacent to the screwdriver insertion slot;
Insulation barrier attachment / detachment groove through which insulation barrier can be inserted
With a hole, by bending the insulating barrier,
Circuit breaker being characterized in that to be able to detachably replace the insulating barrier from the insulating barrier throw-slot.