JPH03102731A - Current-limiting type circuit breaker - Google Patents

Abstract

PURPOSE:To make a board thin and compact and reduce the spark discharge by cohering the end surface of a breaker cage member and the end surface of a current-limiter cage member, and locating both the two side by side, and connecting respective terminals of the arc gas exhausting hole sides of the breaker cage member and the current-limiter cage member. CONSTITUTION:A terminal 2 of the arc gas exhausting hole 22a side of a breaker cage member 1A and a terminal 25 of the arc gas exhausting hole 24a side of a current-limiter cage member 1B are connected to cohere the end surface of the current-limiter cage member 1B to the end surface of the breaker cage member 1A for arrangement. Namely, both the two are located side by side under the condition that the end surface of the current-limiter cage member 1B is cohered to the end surface of the breaker cage member 1A. Since an arc gas exhausting chamber 27 is formed between both exhaust barriers 22, 24 under this coherent condition, the arc gas exhausted from both the arc gas exhausting holes 22a, 24a is deenergized in the arc gas exhausting chamber 27 to be exhausted to the outside of the cage member. A board can thereby be made thin and compact, and the spark discharge is reduced, while a device easy to use is obtained.

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to an improvement in a current-limiting circuit breaker having a current-limiting function. [Prior Art] Fig. 18 is a schematic cross-sectional view showing a conventional circuit breaker of this kind disclosed, for example, in Japanese Patent Publication No. 47-49669, in which the circuit breaker ( A) is placed,
A current limiter (B) is arranged at the bottom. In the figure, (
2) is the power supply side terminal for connecting the external conductor fixed to the partition wall ('la) (corresponding to the bottom of the circuit breaker) of the insulating casing (l);
(3) is a fixed contact provided on the terminal (2), (4) is a movable contact that faces the fixed contact (3), and (5) is a movable contact (4)
(6) is a contact arm that holds the movable element (5), (7) is a shaft that rotatably supports the contact arm (6), (8) is viewed from the front of the housing (1) A protruding operating handle, (9) a fixed conductor fixed to the partition wall (1a), (10) a shunt connecting the movable element (5) and the fixed conductor (9), and (1l) an overcurrent tripping device ,(
12) is an overcurrent trip device on the fixed conductor (9)! (11) is a terminal connected through the terminal (13), a conductor (14) connected to the terminal (12) and introduced into the current limiter (B) is a movable contact having a movable contact (15); (16) is a shunt connecting the movable contact (14) and the conductor (13), (l
7) is a shaft that rotatably supports the movable contact (14);
18) energizes the movable contact (l4) to close the movable contact (l5).
) to the fixed contact (l9), (20) is the load side terminal, (21) is the arc extinguishing chamber located in the circuit breaker housing (A), (22) is the arc gas exhaust hole (22a) ), (23) is an arc extinguishing chamber placed in the current limiter housing (B), and (24) is an arc gas exhaust hole (
24a). Current flows into the circuit breaker (A) from the power supply side terminal (2), and passes through the fixed contact (3), one movable contact (4), one movable element (5), one shunt (10), one fixed conductor (9), and one overcurrent source. Removal device (1l
) enters the conductor (z3) through one terminal (12) and enters the conductor (
13) into the current limiter (B), and the shunt (16
) flows out from the load side terminal (20) through one movable contact (14), one movable contact (15), and one fixed contact (19).

[Problem to be solved by the invention]

In the conventional circuit breaker as described above, the circuit breaker housing (A) and the fault current limiter housing (B) are stacked in two layers.
The external thickness of the casing (1) in the vertical direction (height of the circuit breaker) is large, making it difficult to use as it cannot be adapted to a distribution board, etc., and the two exhaust holes (22a) at the top and bottom. (
Since sparks are emitted from 24a), this side of the housing (1) is difficult to use and has limited uses. The present invention has been made to solve these problems, and its object is to provide a current-limiting circuit breaker that is easy to use and can have a thin and compact board, reduce spark emission, and is easy to use. [Means for Solving the Problems] In order to achieve the above object, the current limiting type circuit breaker according to the present invention has a terminal on the side where the arc gas discharge hole of the circuit breaker housing is located and a terminal on the side of the current limiter housing where the arc gas discharge hole is located. The end face of the current limiter casing is connected to the terminal on the side where the arc gas discharge hole is located, and the end face of the fault current limiter casing is attached to the end face of the breaker casing. [Function] In this invention, the end face of the circuit breaker housing and the end face of the fault current limiter housing are joined together and placed side by side, so that the vertical thickness of the external shape of the housing is reduced. Suitable for electrical panels, etc. Additionally, the terminal on the side of the breaker housing with the arc gas exhaust hole is connected to the terminal on the side of the current limiter housing with the 7-arc gas exhaust hole, which reduces the emission of sparks to the outside of the housing. [Embodiment J] An embodiment of the present invention will be described below with reference to FIG.
FIG. 1 is a longitudinal sectional side view, and the same or corresponding parts as those of the conventional device are designated by the same reference numerals and the explanation thereof will be omitted. In the figure, (1A) is the circuit breaker housing, (IB) is the fault current limiter housing, and (25) is the connecting conductor.The part that protrudes outside is placed on the terminal (2) of the circuit breaker housing (LA) They are overlapped and connected by screws (26). When the connecting conductor (25) is connected to the terminal (2) with the screw (26) in this way, the end face of the current limiter housing (IB) is joined to the end face of the circuit breaker housing CIA〉, and both are connected. Since they can be placed side by side, the vertical thickness of the housing can be reduced. In addition, in this combined state, both exhaust barriers (
Since the arc gas exhaust chamber (27) is formed between 22) and (24), both arc gas exhaust holes (22a) and (24a)
The arc gas discharged from ) is not immediately discharged to the outside of the casing, but is deenergized within the arc gas discharge chamber (27) before being discharged to the outside of the casing. In the above embodiment, both arc gas exhaust holes (22a) (24a
) are facing each other, so you can place things on both ends of the device, freeing up space. Next, another embodiment of the invention will be described with reference to FIGS. 2 and 3. Figure 2 is a partially longitudinal side view, Figure 3 is a
It is a top view of the figure, and the same or corresponding parts as those of the previous embodiment are given the same reference numerals, and the description thereof will be omitted. In the figure, (28) is an insulating cover having multiple small exhaust ports (28a), which is attached to the top surface of the circuit breaker housing (1A) with screws (29) and closes the top opening of the arc gas discharge chamber (27). I'm here. By providing the insulating cover (28) in this way, the arc gas discharge chamber (27) is covered, so the arc gas discharge chamber (27) is covered.
27) Extinguishing the arc gas inside the housing becomes more effective, and the emission of sparks to the outside of the housing is further reduced. Therefore, the board panel can be mounted close to the top surface of the casing, so that the board can be made thinner and smaller. Next, another embodiment of the invention will be described with reference to FIGS. 4 and 5. Figure 4 is a partially longitudinal side view, Figure 5 is the 4th
FIG. 2 is a perspective view showing the absorber shown in FIG. 1, and the same or equivalent parts as in the embodiment shown in FIG. In the figure, (30) is the arc gas discharge chamber (27)
It is an absorbent body installed inside, and has two left and right retaining plates (30a), and four upper and lower absorbent bodies that are attached to both retaining plates (30a) by caulking (30b) and have an exhaust port (30c).
30d). By providing the absorber (30) in this way, both exhaust barriers (22). (24) Each arc gas exhaust hole (22a)
, (24a) is discharged from the exhaust port (30) of the absorber (30) in the arc gas exhaust chamber (27).
c), the emission of sparks to the outside of the housing is reduced. The absorbent body (30) in the above embodiment may be formed by bending a single plate (30A) as shown in FIG.
0B). In addition, in FIG. 4, the insulating cover (28) in the embodiment of FIG. 2 may be provided. Next, another embodiment of the present invention will be described with reference to FIGS. 8 to 10. FIG. 8 is a partially longitudinal side view, FIG. 9 is a perspective view showing the absorber unit in FIG. 8, and FIG. 10 is an exploded perspective view of FIG. 9, which is the same as the embodiment shown in FIG. 4. Alternatively, corresponding parts are given the same reference numerals and explanations are omitted. In the figure, reference numeral (31) denotes an absorber unit, which consists of a support (32) that is fitted into the arc gas discharge chamber (27) and an absorber section (33) that is inserted into this support (32). The support (32) has a U-shaped planar central piece (32
1) has an exhaust port (32a) and both end pieces (322)
．． The lower part of (322) has a split groove (32b). (32b), the claws (32c), (32c) are inclined inward and outward.
)have. The absorbent body part (33) is the absorbent body (
30) with the same configuration as the retaining plate (33a) and the exhaust port (33
b) and absorption Fi (33c). (34)
are both end pieces (322), (322) of the support (32)
The support (3
2) to ensure a strong fit of the absorbent body part (33) inserted into the body. Reference numerals (35) denote extraction holes provided at the upper ends of both retaining plates (33a) of the absorbent body (33). When the absorbent unit (31) is disassembled, as shown in FIG. 10, there are two end pieces (322) on both sides of the support (32). (32
2) is inclined inward, and both claws (32c). (
32c) is located within the area of the central piece (321). After inserting the support (32) into the arc gas jJF outlet chamber (27), the absorber section (33) is inserted into the support (32). In the fitted state of both, as shown in FIG. 9, both end pieces (322) (
322) is pushed out and both claws (32c), (
32c) protrudes. These protruding claws (32c),
(32c) is not shown, but the arc gas discharge chamber (27)
It engages with the inner surface of the circuit breaker, that is, the recess provided in the circuit breaker housing (LA). In this way, the absorber unit (3l) can be installed simply by sequentially inserting the support (32) and the absorber section (33) into the aqueous gas discharge chamber (27). It is fixed by the engagement of (32c). In addition, the claw (32c). (32c) may be provided on the inner surface of the arc gas discharge chamber (27). The embodiment shown in FIGS. 11 to 14 is the embodiment shown in FIGS. 8 to 10 in which a means for fixing the support (32) and the absorbent body part (33) is added. In the figure, (36
) is the screw hole provided on the inner surface of the center piece (321) of the support (32), (37) is the fixing screw, (38a) is the screw insertion hole provided on the top absorption plate (33C), and (38b) is the screw hole provided on the inner surface of the center piece (321) of the support (32). This is a notch made in the other absorption plate (33C). By fixing the absorbent body part (33) to the support (32) with the fixing screw (37) in this way, the absorbent body unit (
3l) to the circuit breaker housing (IA) more securely. Next, another embodiment of the present invention will be described with reference to FIGS. 15 to 17. Fig. 15 is a partially vertical side view, Fig. 16 is a top view of Fig. 15, and Fig. 17 is a perspective view of only the main part of Fig. 15, which is the same as the embodiment shown in Figs. 2 and 3. Otherwise, corresponding parts will be given the same reference numerals and explanations will be omitted. In the figure, (36) is an absorber attached to the insulating cover (28), and the retaining plates (36a) on both sides and this retaining plate (36a)
and an absorbing plate (36c) inserted and held between them and having an exhaust port (36b). By attaching the absorber (36) to the insulation cover (28) in this way, the insulation cover (28) can be attached to the circuit breaker housing (IA).
Since the absorber (36) can be placed in the arc gas discharge chamber (27) by simply fixing the absorber (36) to This has the effect of making the plate thinner and smaller, reducing spark emission, and making it easier to use.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional side view showing one embodiment of the present invention, FIG. 2 is a partially longitudinal sectional side view showing another embodiment of the invention, FIG. 3 is a top view of FIG. 2, and FIG. FIG. 5 is a perspective view showing the absorbent body shown in FIG. 4, and FIGS. 6 and 7 are views showing other embodiments of the absorbent body shown in FIG. 5. 8 is a partially longitudinal side view showing another embodiment of the present invention, FIG. 9 is a perspective view showing the absorbent unit of FIG. 8, and FIG. 10 is an exploded perspective view of FIG. 9. 11 is a perspective view showing another embodiment of the absorbent unit shown in FIG. 9,
Figure 12 is an exploded perspective view of Figure 11, Figure 13 and Figure 1.
4 is a perspective view showing the absorption plate shown in FIG. 11, FIG. 15 is a partially vertical side view showing another embodiment of the present invention, FIG. 16 is a top view of FIG. 15, and FIG. The main part shown in the figure is a perspective view, and FIG. 18 is a schematic sectional view showing the conventional one. In the figure, (IA) is the circuit breaker housing, (IB) is the current limiter housing, (2) . (12) is a terminal, (20) . (25)
is a terminal, (22). (24) is an exhaust barrier, (22a)
, (24a) is an arc gas exhaust hole, (27) is an arc gas exhaust chamber, (28) is an insulating cover, (30) is an absorber,
(3l) is an absorbent unit, (32c). (32c) indicates a claw. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (5)

[Claims] (1) Consisting of a circuit breaker housing that has a built-in interrupting function and has terminals at each end, and a current limiter housing that has a built-in current limiting function and has terminals at each end, and the circuit breaker housing Connect the terminal on the side where the arc gas exhaust hole of the circuit breaker housing is located and the terminal on the side where the arc gas exhaust hole is located on the current limiter housing to connect the end face of the current limiter housing to the end face of the circuit breaker housing. A current-limiting type circuit breaker characterized by having a joint arrangement. (2) An arc gas discharge chamber formed above the terminal between the circuit breaker housing and the fault current limiter housing in a joined state according to claim (1), and an insulator attached to the upper surface of the circuit breaker housing. A current-limiting type circuit breaker, characterized in that the upper surface of the arc gas discharge chamber is closed with a cover. (3) The current-limiting circuit breaker according to claim (2), characterized in that an absorber for cooling arc gas is disposed within the arc gas discharge chamber. (4) A current-limiting circuit breaker according to claim (3), characterized in that either the absorber or the circuit breaker housing is provided with a claw for fixing the absorber within the arc gas discharge chamber. (5) The insulating cover in claim (2) is
) A current-limiting circuit breaker characterized by having an absorber attached thereto.