JPH05114350A - Circuit breaker - Google Patents

Abstract

PURPOSE:To prevent insulating resistance from being lowered between a charging section in the inside of a circuit breaker and the side surface of the circuit breaker because a mating surface between a base and a cover is carbonized at a section where high temperature and high pressure gas is exhausted as the contact of the circuit breaker is opened. CONSTITUTION:Bent sections 114 at both the ends of a stationary barrier section is formed in such a way that the exhaust port side surfaces of a base 1a and a cover 1b are covered with both the ends of the stationary barrier section 116 of a flexible insulating barrier 11A bent to the outside of an exhaust barrier 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker provided with an exhaust barrier having an exhaust hole for exhausting high temperature and high pressure gas in an arc extinguishing chamber.

[0002]

2. Description of the Related Art FIGS.
It is a figure which shows the conventional circuit breaker shown by the 250 publication. In the figure, 1 is a housing made up of a base 1a and a cover 1b, 2 is a stator fixed to the base 1a, 3 is a fixed contact fixed to the inner end of the stator 2, and 4 is the outside of the stator 2. Terminal screws 5 screwed into the ends, 5 are outer conductors, 6 is a mover that opens and closes with respect to the stator 2, 7 is a movable contact fixed to the mover 6, and 8 is formed in the housing 1. An arc extinguishing plate 8a is arranged in the arc extinguishing chamber. Reference numeral 9 denotes an exhaust barrier which is inserted into both side grooves 10 of the casing 1 so as to separate the arc extinguishing chamber 8 from the terminal screw 4 side, and an exhaust hole 9a for exhausting the high temperature and high pressure gas in the arc extinguishing chamber 8 have. Reference numeral 11 denotes a flexible insulating barrier along the outer surface of the exhaust barrier 9, which is composed of a movable barrier portion 11a that covers the exhaust hole 9a and a fixed barrier portion 11b that supports the movable barrier portion 11a.
The stator-side end 110b of FIG. 6B is folded back to the inner surface of the exhaust barrier 9, and both side ends 111 thereof are inserted into the both-side groove 10 together with the exhaust barrier 9.

In such a circuit breaker, both contacts 3, 7
The arc A generated between the contacts 3 and 7 due to the opening of the electrode is transferred to the arc extinguishing plate 8a and extinguished, and the high temperature high pressure gas in the arc extinguishing chamber 8 generated at that time is the exhaust hole of the exhaust barrier 9. 9a, and the movable barrier portion 11a of the flexible insulating barrier 11 is shown in FIG.
As indicated by the middle dashed line, the fixed barrier portion 11b is used as a fulcrum to bend outward and is discharged to the outside.

[0004]

In the conventional circuit breaker as described above, the high-temperature high-pressure gas generated when the contacts 3 and 7 are opened is discharged from the exhaust hole 9a of the exhaust barrier 9. Since the mating surface between the base 1a and the cover 1b on the outside of the exhaust barrier 9, that is, the portion where the high-temperature high-pressure gas is discharged is carbonized by the high-temperature high-pressure gas, the charging portion inside the circuit breaker and the side surface of the circuit breaker are There is a problem that the insulation resistance decreases.

The present invention has been made in order to solve the above-mentioned problems, and by folding back the fixed barrier portion of the flexible insulating barrier from the exhaust barrier, the mating portion between the base and the cover is folded back and covered. , It is prevented that the mating surface of the base and the cover is generated with the opening of both contacts of the circuit breaker, and it is prevented from directly contacting with the high temperature and high pressure gas discharged from the exhaust hole of the exhaust barrier. An object of the present invention is to obtain a circuit breaker capable of suppressing carbonization and adhesion of foreign matter on the mating surfaces and preventing a decrease in insulation resistance between the charging section inside the circuit breaker and the side surface of the circuit breaker.

[0006]

SUMMARY OF THE INVENTION A circuit breaker according to the present invention is a flexible insulation comprising a movable barrier portion along an outer surface of an exhaust barrier and covering an exhaust hole, and a fixed barrier portion supporting the movable barrier portion. A barrier is provided, and both ends of the fixed barrier portion on the side of the movable barrier portion are formed so as to be folded back to the outside of the exhaust barrier.

[0007]

In the present invention, since the folded-back portion of the fixed barrier portion of the flexible insulating barrier covers the surfaces of the base and the cover outside the exhaust barrier, the surfaces of the base and the cover are in direct contact with the high temperature and high pressure gas. Also, even when high-temperature high-pressure gas is discharged from the mating surface between the base and the cover, the high-temperature high-pressure gas is cooled and carbonization is reduced, and insulation between the live part of the circuit breaker and the side surface of the circuit breaker is reduced. It is possible to suppress a decrease in resistance.

[0008]

【Example】

Embodiment 1 An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a vertical sectional side view showing a main part, and FIG. 2 is a line II- in FIG.
II is a sectional view, FIG. 3 is a view seen from the line III-III of FIG. 1, and FIG. 4 is a perspective view showing the flexible insulating barrier of FIG. The reference numerals are given and the description is omitted. In the figure, 11A is a flexible insulating barrier along the outer surface of the exhaust barrier 9, which has a movable barrier portion 11a for covering the exhaust hole 9a and a fixed barrier portion 11b for supporting the movable barrier portion 11a and the fixed barrier. The stator-side end 110 of the portion 11b is folded back inside the exhaust barrier 9. Then, both ends of the fixed barrier portion 11b closer to the movable barrier portion 11a are bent to the outside of the exhaust barrier 9 to cover the exhaust port side surfaces 112 and 113 of the base and the cover located outside the exhaust barrier 9. The formed fixed barrier portion both ends bent portion 114 is provided, and the fixed barrier portion both end portions 111 together with the exhaust barrier 9 are provided at both end grooves 1.
Inserted at 0 and held.

In this way, both ends of the fixed barrier portion 11b of the flexible insulating barrier 11A, which are closer to the movable barrier portion 11a, are bent to the outside of the exhaust barrier 9, and the exhaust port side surfaces 112 and 113 of the base and the cover are bent. By forming the bent portions 114 at both ends of the fixed barrier portion so as to cover, the high temperature and high pressure gas which is generated when the contacts 3 and 7 are opened and is discharged from the exhaust hole 9a of the exhaust barrier 9 of the base and the cover. Since the exhaust port side surfaces 112 and 113 do not come into direct contact with each other, carbonization does not occur, and the exhaust port side mating surface portion between the base and the cover is covered with the fixed barrier portion both-end bent portions 114 to exhaust the base and cover. It is possible to prevent the high-temperature high-pressure gas from being discharged from the mating surface on the mouth side, and prevent the insulation resistance between the charging portion of the circuit breaker and the side surface of the circuit breaker from being lowered.

Further, the bent portions 114 at both ends of the fixed barrier portion of the flexible insulating barrier 11A are formed so as to be separated from the movable barrier portion 11a so as not to obstruct the movement of the movable barrier portion 11a. Therefore, the high-temperature high-pressure gas is discharged to the outside from the exhaust hole 9a by bending the movable barrier portion 11a of the flexible insulating barrier 11A outwardly with the fixed barrier portion 11b as a fulcrum as shown by the chain line in FIG. As a result, the rise in pressure inside the housing 1 can be suppressed.

Embodiment 2 Another embodiment of the present invention is shown in FIGS. FIG. 5 is a vertical sectional side view showing an essential part of this embodiment, and FIG. 6 is a perspective view showing the flexible insulating barrier of FIG. This embodiment is different from the first embodiment in that the movable barrier portion 11a is bent at the tip opposite to the fixed barrier portion 11b, and the terminal screw 4
In addition to the effect of the first embodiment, the movable barrier tip bending portion 115 is formed so as to cover the movable barrier tip bending portion 115, and the movable barrier tip bending portion 115 is provided to surely secure the terminal screw 4. Since it can be covered, both contacts 3, 7
The arc generated between the contacts 3 and 7 due to the opening of the terminal of
It is possible to prevent the problem that the current flows between the movable element 6 and the terminal screw 4 and the current cannot be interrupted, and it is possible to perform more reliable interruption and obtain high reliability.

[0012]

As described above, according to the present invention, both ends of the fixed barrier portion of the flexible insulating barrier, which are closer to the movable barrier portion, are bent to the outside of the exhaust barrier, and the exhaust port side of the base and the cover is bent. Since both ends of the fixed barrier are bent so as to cover the surface, the high temperature and high pressure gas generated by the opening of both contacts and discharged from the exhaust hole of the exhaust barrier causes the surface of the base and cover and the base. It is possible to prevent carbonization of the mating surface between the cover and the cover, and prevent a decrease in insulation resistance.
Further, since the bent portion of the fixed barrier portion of the flexible insulating barrier is formed so as to be separated from the movable barrier portion, the bent portions at both ends of the fixed barrier portion do not hinder the movement of the movable barrier portion, and the high temperature high pressure gas The curved barrier is discharged to the outside from the exhaust hole to suppress the increase in pressure inside the housing, and there is also an effect that it can be manufactured at low cost without requiring special parts.

In addition to the above effects, since the tip of the movable barrier portion opposite to the fixed barrier portion is bent to form the bent portion of the movable barrier portion so as to cover the terminal screw, the exhaust barrier is formed. It is possible to prevent an arc touch to the terminal through the exhaust hole of the device, perform a reliable cutoff, and obtain high reliability.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a main part showing a first embodiment of the present invention.

2 is a cross-sectional view taken along the line II-II in FIG.

FIG. 3 is a view taken along line III-III in FIG. 1.

4 is a perspective view of the flexible insulating barrier of FIG.

FIG. 5 is a vertical cross-sectional side view of essential parts showing a second embodiment of the present invention.

6 is a perspective view of the flexible insulating barrier of FIG.

FIG. 7 is a vertical sectional side view of a main part showing a conventional example.

8 is a cross-sectional view taken along the line VIII-VIII of FIG.

9 is a view as seen from the line IX-IX in FIG. 7.

10 is a perspective view of the flexible insulating barrier of FIG.

[Explanation of symbols]

 1 Case 2 Stator 4 Terminal Screw 6 Mover 8 Arc Extinguishing Chamber 9 Exhaust Barrier 9a Exhaust Hole 10 Both Sides Groove 11A Insulation Barrier 11a Movable Barrier Section 11b Fixed Barrier Section 110 Stator Side End 111 Fixed Barrier Both Ends 112 Base Exhaust port side surface of cover 113 Exhaust port side surface of cover 114 Fixed barrier part both ends bent part 115 Movable barrier part tip bent part

Claims (2)

[Claims] 1. A stator fixed to a housing, a mover that opens and closes with respect to the stator, an arc extinguishing chamber formed in the housing, and a terminal connected to the stator. An exhaust barrier provided in the housing so as to separate the terminal and the arc extinguishing chamber and having an exhaust hole for exhausting high-temperature high-pressure gas in the arc extinguishing chamber; and an exhaust barrier along the outer surface of the exhaust barrier. A flexible insulating barrier consisting of a movable barrier portion covering the exhaust hole and a fixed barrier portion supporting the movable barrier portion,
Both ends of the flexible insulating barrier, the stator-side end of the fixed barrier portion of the flexible insulating barrier is folded back inside the exhaust barrier, and both ends of the fixed barrier portion together with the exhaust barrier are provided. In a circuit breaker configured to be inserted into and held in grooves on both sides, both ends of the flexible insulating barrier, which are closer to the movable barrier portion of the fixed barrier portion, are bent to the outside of the exhaust barrier to exhaust the base and cover. A circuit breaker characterized in that both ends of the fixed barrier portion are formed so as to cover the mouth-side surface, and both ends of the fixed barrier portion are separated from the movable barrier portion. 2. A bent portion of the movable barrier portion of the flexible insulating barrier, which is formed so as to cover the terminal screw, by bending the tip of the movable barrier portion opposite to the fixed barrier portion to the outside of the exhaust barrier. The circuit breaker according to claim 1, wherein the circuit breaker is provided.