JP2502881Y2 - Multi-pole circuit breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a case where any one of a plurality of circuit breaker units connected in series and integrated with each other detects an overcurrent and opens the main circuit. The present invention relates to a multi-pole circuit breaker capable of simultaneously turning off all circuit breaker units and simultaneously operating all circuit breaker units in the on state.

<Prior Art> Such a multi-pole circuit breaker has a plurality of (three in the figure) circuit breaker units u1 to u3 superposed in an interlocking form as shown in FIG. It has a fixed structure. Now, to facilitate understanding,
First, a single-pole circuit breaker having the same basic configuration as the multi-pole circuit breaker units u1 to u3 will be described with reference to FIG. 7 and FIG. 8 showing vertical cross sections in the ON state and the OFF state, respectively. . That is, inside the case body 1,
Overcurrent detection mechanism section A, a trip mechanism section B for opening a main circuit composed of the movable contact 2 and the fixed contact 3 in response to the overcurrent detection operation, and a handle for manually opening and closing the main circuit. 4 and 4 are assembled in an integrally connected state, and the handle 4 projects from the front wall of the case body 1.

The overcurrent detection mechanism unit A is capable of moving an iron piece into a container filled with oil (for example, silicon) when an overcurrent flows through the coil 5 connected to the main circuit by a connecting wire (not shown). Oil dash pot 6 enclosed in
The armature 7 is configured to be rotated by the suction force generated in the armature 7. The armature 7 is integrally formed with a kicking portion 7a that is bent and extends in a substantially L shape.
It is rotatably supported on the yoke 8 by a pin 9.

In addition, the tripping mechanism part B has one end pinned to the handle 4.
A tripping rod 11 rotatably connected by 10 and a movable contact plate 12 integrally provided with a movable contact 2 are provided with a pin 13 at one end at an intermediate portion.
The release stop rod 14 which is rotatably connected by
The trip rods 16 are rotatably connected to each other by means of 15, and the trip rods 16 are swingably attached to the trip stop rods 14 at positions closer to the armature 7 than the pins 15 and the trip rods 16 have a semicircular cross section. The trip rod pin (16a) is detached to be engaged with and disengaged from the concave engaging portion (11a) on the end face of the rod (11).

The trip rod 16 is constantly urged to rotate clockwise in FIGS. 7 and 8 by a spring 16c shown in FIGS. 12 and 13 which will be described later, and normally acts on the stopper 14a of the trip stop rod 14. In the abutting state, the engaging portion 11a of the trip bar 11
And a semi-circular edge portion of the trip rod pin 16a of the trip rod 16 are engaged with each other, whereby the trip rod 11 and the trip stop rod 14 cooperate together.
That is, in this state, the movable contact 2 can be brought into contact with and separated from the fixed contact 3 by rotating the movable contact plate 12 through the tripping mechanism B by the manual operation of the handle 4. There is.

The handle 4 is now rotatable around the pin 18 as a fulcrum.
When is turned from the off state of FIG. 8 to the right side of the figure to the on state of FIG. 7, the tip of the kicking portion 7a of the armature 7 faces the receiving portion 16b of the trip rod 16. In this state, when an overcurrent flows through the coil 5 connected to the main circuit and the armature 7 is attracted to the oil dash pot 6 and rotates, the tip of the kicking portion 7a of the armature 7 moves to the trip rod 16. Since the receiving portion 16b is pushed, the trip rod 16 rotates and the engagement between the semi-circular edge portion of the trip rod 16 and the engaging portion 11a of the trip rod 11 is released. Therefore, by the action of the movable contact spring 17 that constantly urges the movable contact plate 12 that is rotatable about the pin 19 in the counterclockwise direction in the drawing, as shown in FIG. The movable contact 2 is separated from the fixed contact 3 by folding the disengagement stop rod 14 with the pin 15 as a fulcrum, and after this momentary trip state, the handle 4 is moved to the off position by the action of a handle spring (not shown). Returning to the state shown in FIG. 8, the edge portion of the trip rod pin 16a of the trip rod 16 and the engaging portion 11a of the trip rod 11 are brought into the engaged state again, and the circuit can be opened and closed by the handle 4.

The multi-pole circuit breaker units u1 to u3 are configured by attaching several members to the above-mentioned single-pole circuit breaker. That is,
The circuit breaker unit u1 is shown in vertical section in the ON state.
As shown in FIG. 10 and the enlarged front view and the right side surface of the tripping mechanism section B, respectively, as shown in FIGS. 12 and 13, a multi-pole operation arm 20 and a multi-pole operation lever 21 are added to cut off each circuit. The multi-pole operating lever 21 of each of the instrument units u1 to u3
As shown in FIG. 14, they are connected by one connecting rod 22.

The multi-pole operating arm 20 operates in the same manner as the trip rod 11, and is attached in a state of being superposed on the trip rod 11. That is, one end bent in a U-shape is commonly supported by the connecting rod 10 for connecting the trip lever 11 and the handle 4 while sandwiching the trip rod 11, and the middle abdominal portion is separated from the trip rod 11. Pin for connecting with the trip stop rod 14
It is commonly supported by 15, and a push pin 20a is projectingly provided at the other end.

On the other hand, the multi-pole operation lever 21 is integrally molded of synthetic resin, the fulcrum portion is commonly supported by the pin 9 serving as the fulcrum of the armature 7, and the force point side portion 21a is lateral to the push pin 20a on the handle 4 side. And the side point 21 of the working point.
b is opposed to the armature 7 so that it can press the armature 7 toward the suction side, and the working point side parts 21b are formed in pairs on both sides so as to sandwich the yoke 8, and both working point side parts 21b. Has a shape in which the tip ends of are connected by a cylindrical portion 21c. And each circuit breaker unit u1
Each of the multipole operating levers 21 to u3 connects the multipole operating levers 21 by inserting the connecting rod 22 into the cylindrical portion 21c of the multipole operating lever 21.

Next, the operation of this multi-pole circuit breaker will be described. The multi-pole operation arm 20 and the multi-pole operation lever 21 are
The push pin 20a of the multi-pole operating arm 20 that operates integrally with the trip rod 11 is designed to operate in accordance with the operation of the trip mechanism B described with reference to FIGS.
When it is turned on / off by the operation of, it moves up and down substantially vertically between points a and b shown in FIG. 11, and when it trips, it moves diagonally in the lateral direction from point b to point c. That is, the push pin 20a moves with a locus in the lateral direction only during a trip. On the other hand, the multi-pole operation lever 21 has no relation to the multi-pole operation arm 20 when the push pin 20a moves up and down, and when the trip pin 20a moves, it moves in the lateral direction as shown by the arrow in FIG. The force pin side portion 21a is pressed by the moving pin 20a and rotated in the counterclockwise direction in the drawing.

Therefore, when any one of the circuit breaker units u1 to u3 detects an overcurrent and goes into a trip state, the multipole operation lever 21 of the circuit breaker unit rotates, and all other multipole units are connected via the connecting rod 22. The operating lever 21 also cooperates to rotate the armature 7 to the suction side.

<Problems to be solved by the invention> By the way, in this type of multi-pole circuit breaker, the closing operation of all the units may be used in conjunction with each other. However, the structure shown in FIGS. According to the multi-pole circuit breaker, the handle 4 is provided for each unit. Therefore, as shown in FIG. 14, the handle of each circuit breaker unit u1 to u3 can be linked to the closing operation of each unit. 4 must be connected to each other by a connection operation 23,
It requires a lot of space for its operation. Also,
As the number of units to be connected increases, the number of the handles 4 protruding to the outside of the units also increases. Therefore, not only the problem of the operation space but also the problem of the external design cannot be ignored.

According to the above-mentioned conventional multi-pole circuit breaker, the multi-pole operating arm 20 is composed of two parts, that is, the main body part that is a press work part and the push pin 20a that is a cutting work part, so that the number of parts is large. At the same time, an assembly man-hour for caulking this is required. Moreover, as shown in FIG. 13, since one end of the multipolar operating arm 20 is U-shaped, the handle 4 and the tripping rod 11 are inserted into the U-shaped portion from the side during assembly. Since the three parts are simultaneously connected by the assembling means in the three axial directions in which the pins 10 are inserted into these, there is a problem that the assembling work becomes complicated and the workability is extremely poor.

The present invention has been made in view of the above problems,
It is an object of the present invention to provide a multi-pole circuit breaker having a structure capable of operating all circuit breaker units with a single handle.

<Means for Solving the Problems> In the present invention, as a technical means for achieving the above-mentioned problems, a multi-pole circuit breaker is configured as follows. That is, the overcurrent detection mechanism that rotates the armature by the suction force generated by the overcurrent and the trip rod and the tripping rod are released in response to the rotation of the armature, and the movable contact is fixed. It is rotatably supported by a tripping mechanism that opens the main circuit to open the main circuit, and a cylindrical support formed in the main body case.When a rotational force is applied, the movable contact becomes a fixed contact. Operation backbone (handle backbone) that operates the trip mechanism so that it touches and separates
And, while one end is connected to the operation backbone so that it has a displacement trajectory in the lateral direction only when the tripping mechanism part trips, it has a push pin at the other end that is a free end.
In addition, the multi-pole operation arm with the intermediate part connected to a part of the mechanism part and the fulcrum part are rotatably supported, one end facing the push pin, and the other end sucking it to the armature. Side circuit breaker units equipped with a pair of multi-pole operating levers that can be pressed together are connected by connecting each multi-pole operating lever with a connecting rod, and the operation of each circuit breaker unit is performed. A non-circular engagement hole is formed in each of the trunks, and the operation trunks of these units are connected so as to interlock by inserting one connecting rod into each of the engagement holes. It is characterized in that a handle for giving a rotation by a manual operation is provided on an operation backbone of one of the circuit breaker units.

<Operation> When one of the circuit breaker units detects an overcurrent and trips, the push pin of the multi-pole operating arm that operates integrally with the tripping rod is displaced in the lateral direction, causing the multi-pole operating lever to move. Since the one end is pushed, the multi-pole operation lever rotates, and this rotation is transmitted to each multi-pole operation lever of the other unit through the connecting rod, and all units perform the trip operation.

Further, in the multi-pole circuit breaker of the present invention, since the non-circular engagement holes are provided in the operation bases of the respective units, by inserting one connecting rod into these engagement holes, The closing operation of all circuit breaker units can be linked. Therefore, only one handle projects from the main body case regardless of the number of circuit breakers connected.

<Embodiment> Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a front view of a first embodiment of the present invention with a cover removed, FIG. 2 is a right side view of an essential part, and FIG. 3 is an exploded front view. The overcurrent detection mechanism section A ′ includes a coil 25, an oil dash pot 26, a yoke 27 and an armature 28.
Although it is composed of the same type of parts as those of the prior art, the shape of the yoke 27 is mainly different. The yoke 27 is provided with a mounting portion 27a for the armature 28 having only a U-shaped upper end portion, and a single support piece 27c having a mounting hole 27b formed at the other end side.
It has a simple shape with a protrusion. An armature 28 and a multi-pole operating lever 30 are attached to the mounting portion 27a by a pin 29.
Is rotatably supported, and the armature 28 is wound around the pin 29, so that the armature 28 is oil-dashed.
It is urged to rotate away from the pot 26.

In this overcurrent detection mechanism A ', as shown by the one-dot chain line arrow in FIG.
The pin 29 is positioned in the side groove 32a and the pin 29 is fitted in the circular recess 32b, and is positioned inside the case body 32.

Next, the tripping mechanism B'is composed of the tripping rod 33, the tripping stop rod 34, and the trip rod 35, which are similar to the above-mentioned conventional circuit breaker and function similarly. Each of the parts of the product has a complicated structure by press working or a combination of this and a cut product, but in each case, a part having a simplified shape by casting is combined.

That is, as shown in FIGS. 4 and 5 showing an enlarged front view and a right side view thereof, respectively, the trip stop rod 35
In contrast to the U-shape in the conventional circuit breaker, it is a simple plate shape, and the detent piece 34a of the trip bar 33 is pulled backward from the upper right side of the upper end and the trip bar 35 is moved forward from the left side of the central portion. Locking pieces 34b of the trip lever spring 36 are formed in a protruding shape, and the locking pieces 34c of the trip lever spring 36 are cut and raised from the right side of the central portion to the front side.

On the other hand, the trip rod 35 includes a trip board 35a, a holding shaft portion 35b projecting from the trip board 35a to the front side, and a semicircular cross section projecting coaxially from the trip board 35a in the opposite direction to the holding shaft portion 35b. The trip rod pin 35c, the receiving piece 35d protruding from the end of the trip board 35a to the front side, and the locking projection 35e protruding from the receiving piece 35d are integrally formed by casting.

Therefore, the trip-stop rod 33 is overlapped with the trip-stop rod 34, and the pin 37 is swaged to be rotatably connected to each other, and the trip rod 35 is detached from the trip rod pin 35c.
It is inserted into the mounting hole of 4 and rotatably connected to the release stop rod 34, and finally, the trip rod spring 36 is inserted into the holding shaft portion 35b so that both end portions of the hooking piece 34c and the receiving piece 35d. Locking protrusion 35e
It can be assembled with a very simple work that is hooked on and.
The trip rod 33 and the trip rod 35 are disengaged from each other by the engagement portion 33a and the edge portion of the trip rod pin 35c as in the case of the conventional circuit breaker.

As shown in FIG. 2, a handle 39 rotatably connected to the trip rod 33 by a pin 38 is a fulcrum that is integrally projected from the rear surface and has a hexagonal engagement hole 39b formed therethrough. By inserting the tubular portion 39a into the cylindrical support portion 32c integrally formed with the case body 32 as shown in FIG.
It is mounted so that it can rotate within an angle (generally 60 °) indicated by θ in the figure. The handle spring 40 is fitted and inserted into the semicircular groove portion 33b formed on the front surface of the fulcrum tube portion 39a of the handle 39, and one end thereof is engaged with the locking hole 39d of the groove portion 39c,
The other end is attached to the insulating wall 32d of the case body 32 by being hooked.

An end of a trip stop rod 34 is rotatably connected to a central portion of a movable contact plate 41 having a movable contact 41 at one end by a rivet 43 and is wound around the rivet 43.
44 is hooked between the trip stop rod 34 and the movable contact plate 42.

In this movable contact plate 42, a long hole-shaped support hole 42a formed at the other end is movable between the cylindrical shaft support 32e of the case body 32 and the mounting hole 27b of the support piece 27c of the yoke 27. Contact spring 45
It is rotatably supported by interposing with it and inserting a pin 46 through these, and both ends of the movable contact plate 42.
The movable contact 41 is always urged in a direction to be separated from the fixed contact 47 by the movable contact spring 45 hooked to the support piece 27c. Further, it is connected to the main circuit by a connecting line 42b.

Next, the structure which is the gist of the present invention will be described. For each circuit breaker unit U1, U2, U3, ... Shown in FIG.
The multi-pole operation lever 30 and the multi-pole operation arm 48 are mounted, and each multi-pole operation lever 30 is connected by one connecting rod 49.

The multi-pole operating arm 48 is integrally formed of synthetic resin in a shape as shown in FIG. 6, and allows the pin 38 to be inserted into the cylindrical connecting portion 48a at one end and the connecting hole 4 in the middle portion.
The pin 37 is inserted into the 8c, and the trip rod 33 is attached so as to be overlapped with the trip rod 33, and the same operation as that of the trip rod 33 is performed. A push pin 48b is formed at the other end of the multi-pole operating arm 48.

The multi-pole operating lever 30 has a shape similar to that of the existing one, and the fulcrum part is a pin 29 that serves as a fulcrum of the armature 28.
, The force point side portion 30a faces the push pin 48 on the handle 39 side, and the action point side portion 30b is supported by the armature 28.
On the other hand, it is arranged so that it can be pressed toward the suction side, and a cylindrical shaft support portion 30c is formed in an orthogonal direction from the end portion of this action point side portion 30b. An arm portion having the same shape as that of the side portion 30b is formed integrally with the side portion 30b, and is supported by both ends of the pin 29 such that the armature 28 is sandwiched between the arm portion and the action point side portion 30b. Further, as shown in FIG. 2, one connecting rod 49 overlaps the insertion hole 32 of the case body 32 and the case body 32 on each shaft support portion 30c of each circuit breaker unit U1, U2, U3. The multi-pole operation levers 30 are connected through the insertion holes (not shown) of the cover body 50 so as to interlock with each other. Therefore, neither the cover body of the leftmost unit U1 nor the case body (not shown) of the rightmost unit U3 in FIG.

Further, as shown in FIG. 2, the handle 39 is provided only in the leftmost unit U1, and in the other units U2 and U3, a handle backbone 39 'having a shape in which only the operating portion of the handle 39 is removed is provided in the handle 39. The handle 39 and the handle base 39 'each have a hexagonal engagement hole 39b in which a single connecting culm 51 has a case body 32 and a cover body 50.
The handle 39 and each handle base portion 39 'are interlocked with each other by being inserted through each insertion hole (not shown). Therefore, the insertion hole is not formed in the cover body 50 of the leftmost unit U1 and the case body 32 of the rightmost unit U3.

Note that 52 and 53 in FIG. 1 are external connection terminals and 54 and 55, respectively.
Is a pair of fittings sandwiched and sandwiched between the case body 32 and the cover body 50 superposed thereon, 56 is an arc chute plate, 57 is a mounting rivet, and 58 is the cover body of the case body 32.
The back covers that close the gap with 50 are shown respectively.

Next, the operation of the above embodiment will be described. By operating a single handle 39 for each of the circuit breaker units U1 to U3, each handle trunk portion 39 'through the connecting culm 51.
Rotates integrally with the handle 39, and each circuit breaker unit
The opening and closing operations of the main circuits of U1 to U3 are performed in tandem. Now
When an overcurrent is detected in any one of the units U1 to U3 while all the units U1 to U3 are turned on, the same main circuit as the conventional single-pole circuit breaker described in FIGS. 7 to 9 is used. The shutoff operation is performed. That is, the armature 28 is sucked by the oil dash pot 26 and rotated, and the kick bar of the rotating armature 28 causes the trip rod 35 to move.
When is rotated, the trip bar 33 and the trip stop rod 34 are folded as shown in FIG. 9 to be in a trip state.

At this time, the push pin 48b of the multi-pole operating arm 48 which operates integrally with the tripping rod 33 moves from the point b to the point c shown in FIG. , The multipole operating lever 30 is rotationally displaced about the pin 29 from the solid line position in FIG. 1 to the one-dot chain line position.
The displacement of 30 is transmitted to the multipole operation lever 30 of the other unit by the connecting rod 49, the armature 28 of the unit in which no overcurrent flows is also displaced to the suction side, and eventually all the units U1 to U3 are turned off. And all handles 39
In addition, the handle base 39 'is also turned off. Now, by operating the single handle 39,
All units U1 to U3 are returned to the ON state at the same time by 51.And, in this multipole circuit breaker,
In the present embodiment, all of the trip rod 33, the trip stop rod 34, and the trip rod 35 of the trip mechanism B'are flat plates which can be produced by casting. It has become. Therefore, the tripping mechanism section B'can be assembled by stacking these in sequence and caulking the pin 37 and connecting them in a two-way assembly procedure in which the trip rod pin 35c is inserted, and the multipolar operating arm 48 is also
It can be attached by a two-way assembly procedure in which the pins 38 and 37 are simply inserted into the connecting portion 48a and the connecting hole 48b, respectively, and the assembly workability and productivity are significantly improved, and the accuracy is also improved by the manufacturing die. It is uniquely determined and high.

Further, regardless of the number of circuit breaker units, a single handle protruding from the main body case may be used, which has the advantage of requiring a small operation space.

The present invention is not limited to the above description and the contents of the drawings, and may include various modifications without departing from the scope of the claims. For example, the unit U1 including the handle 39 may be arranged in the center. Further, although the connecting culm 51 has a hexagonal cross section, it has a polygonal shape other than a circular cross section, or has a protruding section for engagement even if it has a circular cross section so that the handle 39 and the handle backbone 39 ′ can be formed. Any shape is acceptable as long as it can rotate integrally.

Furthermore, an alarm switch is attached to the back cover 58, and the actuator of this alarm switch is opposed to the free end of the multi-pole operation arm 48, so that it cannot be operated by the operation of the handle 39, and the alarm switch can be activated only during trip operation. It is also possible to configure a multi-pole circuit breaker with an alarm switch that operates and emits a signal.

<Effects of the Invention> As described above, according to the multi-pole circuit breaker of the present invention, each circuit breaker unit to be connected is rotatably supported by the cylindrical support portion of the main body case,
When a rotational force is applied, an operating backbone is provided that activates the trip mechanism so that the movable contact comes into contact with and separates from the fixed contact, and each operating backbone has a non-circular engagement hole. Then, one connecting rod is inserted into each of the engaging holes and connected so as to interlock with each other, and the operation main part of one of these circuit breaker units is manually rotated. Since the handle is provided, regardless of the number of connected circuit breaker units, only one handle is required to project from the main body case, and since there is no need to provide a connecting rod or the like outside the main body case, the operating space is small. I'm done. It is also excellent in terms of appearance and design.

[Brief description of drawings]

FIG. 1 is a partially removed front view of an embodiment of the present invention, FIG. 2 is a right side view of a portion of FIG. 1, FIG. 3 is an exploded front view of FIG. 1, and FIG. 1 is an enlarged view of a part of FIG. 5, FIG. 5 is a right side view of FIG. 4, FIG. 6 is a perspective view of a main portion of FIG. 1, and FIG. 7 is a conventional single-pole circuit breaker in an ON state. Fig. 8 is a cut-away front view of Fig. 7, Fig. 7 is a cut-away front view of Fig. 7, Fig. 9 is a partial front view of the same trip state, and Fig. 10 is a cut-away front view of a conventional multi-pole circuit breaker. FIG. 11 is an operation explanatory view of the push pin of FIG. 10, FIG. 12 is an enlarged view of a part of FIG. 10, FIG. 13 is a right side view of FIG. 12, and FIG. 14 is of FIG. It is a schematic side view. A '... Overcurrent detection mechanism B' ... Tripping mechanism B 28 ... Armature 28 30 ... Multi-pole operating lever 33 ... Tripping rod 35 ... Trip rod 37, 38 ... Pin 39 ... Handle 39a ... Rotation fulcrum 39b ... Engagement hole 39 '... Steering wheel base 41 ... Movable contact 47 ... Fixed contact 48 ... Multi-pole operating arm 48a ... Connecting portion 48b ... Pushing pin 48c ... Connecting hole 49 ... Connecting rod U1 to U3 ... Circuit breaker unit 51 … Connected culm

Claims (1)

(57) [Scope of utility model registration request] 1. An overcurrent detection mechanism portion for rotating an armature by a suction force generated by an overcurrent, and a trip rod and a tripping rod are unlocked in response to the rotation of the armature, and a movable contact is provided. The movable contact is rotatably supported by a tripping mechanism that opens the main circuit by separating the fixed contact from the fixed contact, and a cylindrical support formed on the main body case, and is given a rotational force. To the fixed contact and to operate the trip mechanism portion to operate the trip mechanism portion, and one end to the operation trunk portion so as to have a displacement trajectory in the lateral direction only when the trip mechanism portion trips. In addition to being connected, a multi-pole operating arm having a push pin at the other end, which is a free end, and an intermediate part connected to a part of the tripping mechanism part, and a fulcrum part are rotatably supported. ,
A circuit breaker unit having a multipole operating lever, one end of which faces the push pin and the other end of which is opposed to the armature so that the armature can be pressed on the suction side, The operation levers are connected by connecting rods and are connected to each other, and non-circular engagement holes are formed in the operation trunks of the respective circuit breaker units, and the operation trunks of these units are connected to each other. One connecting rod was inserted into the dowel hole and connected so as to interlock with each other, and a handle for giving rotation by manual operation was provided at the operation base of one of the circuit breaker units. A multi-pole circuit breaker characterized by the following.