JPH03201329A - circuit breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field J] This invention is a circuit breaker, for example, by operating a handle from the front of the circuit breaker housing to charge a closing spring, and then by giving a command, the current-carrying part is activated by the above-mentioned stored force. This relates to an air circuit breaker that is closed and then opened.

[Prior art] Figures 9 to 16 are shown in, for example, Japanese Patent Application Laid-Open No. 58-129720.
9 is a side sectional view, FIG. 10 is an explanatory view of the handle shaft, and FIG.
Figure 11 is a schematic configuration diagram of the ON and OFF operation section,
Fig. 2 is an explanatory diagram of the contact closed standby maintenance mechanism, Fig. 13 is an explanatory diagram of the contact open maintenance mechanism, Fig. 14 is an operating state diagram during ON operation, Fig. 15 is an operating state diagram during OFF operation, 16(A) to (C) are explanatory views of the operation of the charge lever.

In the figure, (1) is a housing, (2) is an energy storage unit case, and (3) is a current-carrying unit unit case. The energy storage unit case (2) is located on the front side (left side) of the housing (1), and the current carrying unit unit case (3) is located on the front side (left side) of the housing (1).
are located on the rear side (right side) of the housing (1) and are fixed to a side plate (4) that forms a part of the housing (1). (5) is an arc extinguishing chamber that has a plurality of arc extinguishing plates (6) and is engaged with the current carrying unit unit case (3), and (7) is a storage case for an electric control unit such as a tripping relay. .

Next, the configuration of the energy storage section and the current carrying section will be explained in detail (11)
is a handle for operation arranged in a forward leaning position on the housing (1), the operating end (11a) thereof protrudes from the upper part of the front surface (1a) of the housing (1), and the base end (llb ) is the housing (
1) is rotatably pivoted to the energy storage unit case (2) with a shaft (12) provided at a position close to the lower part of the front surface (la), and the proximal end (11b)
As shown in FIG. 10, a handle return spring (13) is hung between the power storage unit case (2) and the power storage unit case (2). In FIG. 9, (14) is a ratchet disposed coaxially with the shaft (12), (15) is pivotally connected to the base end (llb) of the handle (11), and the pressing spring (16) (
It is a movable pawl that receives the pressing spring force of Fig. 10), and when the handle (11) is pressed down, the ratchet (14)
) is intermittently driven counterclockwise. (17) is coaxially attached to the ratchet (14) and is fastened to it.
8) etc., and this cam (1
7) can be driven by a motor (not shown). (19) is a locking pawl that is pivotally attached to the pivot of a charge lever (described later) and prevents the ratchet (14) from returning to rotation.

(20) is a charge lever extending from the rear of the cam (17) above the cam (17) and rotatably supported on the shaft (21) above the cam (17).
) is in rolling contact with the roller (22) whose lower end (20a)
The cam (17
) is integrally provided with a blocking piece (24) that abuts on the bottle (23). At the rear position of the lower end (20a) of the charge lever (20), the upper end (26a) is connected to the shaft (2).
Closed arm (26) pivotably supported on 5)
The closed arm (26) is connected to the lower end of the charge lever (20) via a link (27).

(28) and (29) are connected bins in the link (27). (30) is the rear (right side) of the above case (1)
The closing spring located on the lower end side uses a compression coil spring. One end (30a) and the other end (30b) of the closing spring (30) are connected to the lower end (26b) of the closed arm (26) and the housing (1), respectively, with bins (31) and (32). It is pivotally mounted so that it can rotate. (33) A spring holder, which holds the closing spring (3
This is to smoothly perform the compression deformation of 0).

The pivot (25) of the closed arm (26) is attached to the closed arm (25) when the spring force of the closing spring (30) is released.
A link (35) that is pushed up by the push-up piece (34) on the upper end side of the link (35) and displaced in an arc shape is rotatably supported. (36) is a bottle provided on the displacement end side of the link (35) and pushed up by the push-up piece (34); (37) is formed on the case (2) to fit the bottle (36); The circular arc-shaped guide hole (38) is a pin for preventing clockwise rotation of the closed arm (26). (39)
, (40) are a pair of links that are vertically arranged above the closed arm (26) and are bendably connected with the bottle (41).
) is connected to the bin (36). (4
2) is a pivot located above the links (39) and (40), that is, on the front (left side) of the current-carrying part case (3), and is rotatably supported; 42) is a direction change lever fixed to the lever (43).
The upper end of the upper link (39) of the pair of links (39, 40) is connected to the lower end (43a) of the link via the connecting bin (44).
b) includes a bottle (4) to which one end of an insulating link (45) constituting a part of the contact opening/closing mechanism on the current-carrying part side, which will be described later, is connected.
6). The above pair of links (39).

Link mechanism (47) for transmitting stored force by (40) etc.
It consists of (48) is a counterclockwise rotation prevention shaft of the lever (43), and (49) is pivotally connected to the pin (44) at the lower end of the lever (43) to prevent the lever (43) from rebounding. The rebound prevention pieces (50) are the return springs of these prevention pieces (four pieces).

(51) and (52) are a pair of conductors forming part of the current-carrying part, (53) is a current transformer installed on one conductor (51), and (54) is the tip of this conductor (51). The main fixed contact is fixed to the (55) is a main movable contact that contacts and separates from the fixed contact (54), and (56) is this movable contact (
A flexible conductor (55) is fixed between the proximal end of the movable element (56) and the other conductor (52).
57). (58) is a pivot bottle (59)
This is a movable element holder that holds a movable element (56) via a movable element holder.The lower end of this holder (58) is rotatably supported on the case (3) with a pivot (60), and the upper end is rotatably supported on the case (3). (62) connected to the other end of the insulating link (45) by a pin (61) is hung between the movable element (56) and the case (3) side, and is connected to the movable element (56). A contact pressure spring (63
), (64) are the movable arc and fixed arc contacts, respectively, and (65), (66) are the arc contacts (63), respectively.
), (64) are holding members, and (67) is a stopper for restricting rotation of the movable element holder (58). The movable element (56), the holder (58) and the insulating link (45)
), etc., the contact opening/closing mechanism (69) is constructed (see Figures 14 and 15), (70), (71), etc.
is a bulkhead.

Above the charge lever (20) is a pivot (72).
A square-shaped closing latch (73) pivotably supported on the
is installed. The lower end (73) of this latch (73)
The upper end (20b) of the lever (20) is attached to the tip of the lever (20).
) is formed with a notch (75) that receives the clockwise pressing force of the locking roll (74) fixed to the locking roll (74), and when the pressure accumulation is completed, the pressing force resists the clockwise spring force of the return spring (76). (See Figure 12) (77
) is a cross-sectional latch that releasably locks the upper end (73b) of the closing latch (73) to prevent it from rotating counterclockwise, and is rotatable relative to the case (2). Together with the closing latch (73) and the like, it constitutes a contact closing standby maintaining mechanism (78). As shown in FIG. 11, the above-mentioned latch (77) is rotated counterclockwise by an ON operation member (79) for releasing the closing standby state.

(80) is rotatably supported on the pivot (72) of the closing latch (73), and the return spring (76) (
The tripping latch (81) which receives the counterclockwise spring force in FIG.
2) is a cam plate that is rotatably supported by the cam plate and is biased by the counterclockwise spring force of the return spring (83) shown in FIG. It has a recessed part (85) that releasably engages with the locking roll (84) of the part, and applies a clockwise pressing force against the tripping latch (80) against its return spring force. It is supposed to be done. (86) in FIG. 9 is a tensioner connected between the bin (87) of the cam plate (81) and the connecting bin (41) of the pair of links (39) and (40).
This is the link. (88) is the above tripping latch (80)
It is a cross-sectional latch that prevents clockwise rotation, and is rotatably attached to the case (2), together with the above-mentioned tripping latch (80) and cam plate (81). , a contact open standby maintenance mechanism that extends the link mechanism (47) against the spring force of the contact pressure spring (62);
89). The above-mentioned latch (88) is the first
It is designed to be rotated clockwise by the OFF operation main body (90) shown in FIG. In addition, (91) in Figure 11
The springs shown above are for automatic return of the above-mentioned latches (77) and (88), and (92) and (93) are the D-type latches (77), respectively.
And operated pieces (94) and (95) provided in (88)
) is a stopper, and (96) and (97) are push rods.

Next, the operation of the above configuration will be explained.

(I) When charging the closing spring (30): First, when the handle (11) in Fig. 9 is pressed down against the return spring force, the movable pawl (15) engages the ratchet (14). The cam surface (17a) is rotated counterclockwise, and the cam (17) is also rotated in the same direction.
The charge lever (
20) is rotated counterclockwise about its axis (21) (see FIG. 16(A)). This charge lever (
20) causes the closed arm (26) to rotate counterclockwise around the shaft (25) via the link (27), so that the closing spring (30) starts to be compressed. Ru. The closing spring (30) is further compressed and deformed by repeating the handle operation.

By pressing down the handle (1) a predetermined number of times, for example, several times, the cam (17) moves the charge lever (20) slightly from the maximum displacement position (see Fig. 16 (B)!). At the same time as it is rotated counterclockwise, the bottle (
23) is the blocking piece (
24) (see Fig. 16(C)), and the cam (17)
The rotation of the closing spring (30) is blocked, and the pressure accumulation operation of the closing spring (30) is completed (see FIG. 9).

When the above pressure accumulation operation is completed, the extension spring force of the closing spring (30) is applied to the closed arm (26) and the link (27).
The charge lever (20) is about to be rotated clockwise around the shaft (21) via the . Therefore, the locking roll (74) at the upper end of the charge lever (20) presses the lower end notch (75) of the closing latch (73), causing the closing latch (73) to move against the return spring force. Attempt to rotate counterclockwise. However, due to the counterclockwise rotational force, the upper end (73b) of the closing latch (73)
) is locked by the D-shaped latch (77), so the closing latch (73) is prevented from rotating counterclockwise, in other words, the charge lever (20) is prevented from rotating clockwise. (1st
2 and FIG. 16(C)), therefore, the push-up blade of the closed arm (26) against the bottle (36) in the link mechanism (47) is also blocked, and the link mechanism (
47) when the contacts (54) and (55) are closed, the standby state is set.

(II) During ON operation: First, operate the ON operation body (79) shown in Fig. 11 against the return spring force to rotate the D-type catch (77) counterclockwise. From the state shown in Figure 16(C), the closing latch (7)
3) rotates counterclockwise, the locking roll (74) of the upper end (20b) of the charge lever (20) is moved from the notch (75) of the closing latch (73) to
is released, and the charge lever (20) rotates clockwise under the force of the stored spring. For this reason, link (27)
The closed arm (26) is also rotated clockwise around its axis (25) via the closed arm (26). When the closed arm (26) rotates in response to the stored spring force, the push-up piece (34) of the closed arm (26) moves towards the bottle (
36) is pushed upward along the guide hole (37), the pair of links (39) and (40) are also displaced upward while in the extended state.

The upward displacement of the links (39) and (40) causes the direction change lever (43) to rotate clockwise. The rotational force of this lever (43) is transmitted to the contact opening/closing mechanism (69) via the insulating link (45). That is, the mover (56
) is rotated clockwise about its axis (60), so the movable contact (55) is moved by the contact pressure spring (
It comes into contact with the fixed contact (54) against the spring force of 62), and the contact is in a closed state. In this state, the closing spring (30) is released, and the contact pressure spring (62) is compressed and stored.

The closing spring (30) is released, and the contact (54),
(55) is closed, the spring force of the contact pressure spring (62) to expand is applied to the mover (56) and the holder (55).
8), the direction change lever (4) via the insulated link (45)
3) in the counterclockwise direction around the shaft (42).

By the way, since the direction change lever (43) is receiving rotational force in the counterclockwise direction, the l pair of links (39) and (40) connected to this lever (43) apply a pressing force to the right. Due to this pressing force, the cam plate (81) receives a rotational force clockwise around the shaft (82) via the link (86) shown in FIG. Therefore, the cam plate (8
1) pushes up the tripping latch (80) against the spring force of the return spring (83) and applies clockwise rotational force to the tripping latch (80), but this rotational force is He was blocked by Ucchi (88). For this reason, the recessed part (
85) and the locking roll (84) are maintained, and the tension force by the latch (86) acts on the links (39) and (40), so that the link (39) , (40) are maintained in a stretched state against the stretching force of the contact spring (62). In other words, the contact open standby state is set.

(m), During OFF operation: First, operate the OFF operation body (90) shown in Fig. 11 against the return spring force to rotate the D-type catch (88) clockwise. The latch (80) can be removed from the state shown in Figure 13.
is rotated slightly clockwise against the return spring force, so the engagement between the locking roll (84) of this latch (8°) and the recessed part (85) of the cam plate (81) is released. be done. Therefore, the cam plate (81) resists the return spring force and the 15th cam plate (81)
It is rotated clockwise as shown in the figure. Therefore, the tensioning action of the link (86) is lost, and the l pair of links (
39) and (40), the waist is bent in a state due to the stretching force by the contact pressure spring (62).This causes the contact point (
54) and (55) will be opened.

The open state of the contacts (54) and (55), that is, the 15th
In the state shown in the figure, if the above-mentioned handle is operated again to build up pressure in the closing spring (30), the links (39) and (40) will accordingly extend while being displaced downward, and the cam plate (81) will be expanded. ) is rotated counterclockwise by the return spring force, the recessed portion (85) of this cam plate (81)
) engages with the locking roll (84) of the tripping latch (80), resulting in the state shown in FIG.

[Problem to be Solved by the Invention 1] In the conventional circuit breaker as described above, in order to perform the on operation using the on operation body (77), the closing latch (73) is pressed on the on operation body (77) when charging is completed. For this purpose, the closing latch (73) and charge lever (
20), a link (27), and a closed arm (26), resulting in a complicated link mechanism that is expensive.

This invention was made to solve this problem, and aims to simplify the link mechanism by using a charging cam as a part of the link mechanism, and to obtain a circuit breaker that can reduce costs. .

[Means to solve the problem]

In order to achieve the above object, the circuit breaker according to the present invention has the following features:
The charging cam includes a charging cam that is rotationally driven, a charging arm that is rotationally displaced by engagement with the charging cam by an arm-side roller, and a closing spring that is charged by the rotation of the charging arm. The cam surface is formed by two cam surfaces whose centers of curvature radius are located in opposite directions with the camshaft as a boundary, and one of these two cam surfaces is a cam surface that generates a force to rotate the cam in the cam driving direction. The charging cam is in a positional relationship to engage with the arm-side roller when charging is completed, and furthermore, when charging is completed, the charging cam is prevented from rotating via a close latch.

[Function] In the present invention, since the charging cam is prevented from rotating by the close bar via the close latch when charging is completed, the charging cam can be used as a part of the link mechanism.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 to 8. Fig. 1 is a side sectional view showing the trip state when the closing spring is released, Fig. 2 is a side sectional view showing the off state when charging is completed, Fig. 3 is a side sectional view showing the on state, and Fig. 4 is a side sectional view showing the off state when charging is completed. An explanatory diagram showing only the essential parts of Fig. 1, Fig. 5 an explanatory diagram showing only the essential parts of Fig. 2, Fig. 6 an explanatory diagram showing only the essential parts of Fig. 3, and Fig. 7 a camshaft. FIG. 8 is a side view of the main shaft, and the same or equivalent parts as those of the conventional one are given the same reference numerals and the explanation thereof will be omitted.

In the figure, (1) is the housing, molded case (1A)
and a mold cover (1B). (12
A) is a camshaft, which is rotatably supported by the housing (I). (100) is a ratchet fixed to the camshaft (12A), and is driven by a motor (not shown). (101) is the cam side roller provided on the cam (17), (
102) is located above the cam (17) and the fixed shaft (103) is located above the cam (17).
) is a fulcrum, and (104) is an arm-side roller provided at one end of the charge arm (io2).
Rotationally driven by. (105) is the charge arm (
102) is a cam surface formed on the upper surface of the midsection; (106) is a guide plate that holds the closing spring (30);
It has a). (107) is the charge arm (10
2) Use the spring cap provided at the other end to open the elongated hole (106a).
, and accumulate pressure in the closing spring (30). '(1
08) is a close latch that is rotatably attached to a fixed shaft (103), and has a latch-side roller (109) in its midsection, and one end engages with a cam-side roller (101).

(110) is a close latch that rotates around a fixed shaft (111), and its lower end engages with a latch-side roller (109) and its upper end engages with a close bar (112). Although not shown, the close bar (112) is turned on manually or by a solenoid.

(113) is a main shaft, which is rotatably supported by the housing (1). (114) is the main shaft (11
3), three arms are fixed at equal intervals, and three insulating links (45) for three poles are connected to each other by a pin (46). (115) is an arm having the same shape as the arm (114), and is fixed to the main shaft (113) at the same angle as the arm (114). (116) is a loading toggle link mechanism consisting of two links, one end of which is a bin (116).
(118) connected to the arm (115) by (17)
is a link-side roller that is rotatably supported by the center pin (119) of the link mechanism (116), and is positioned to abut against the cam surface (105) of the charge arm (102). A link lever (120) is rotatably supported by a fixed shaft (121), and the other end of the link mechanism (116) is connected to one end by a pin (122). (123)
is a lever-side roller rotatably provided at the midsection of the link lever (120), and (124) is a trip latch that is rotatably supported on the fixed shaft (111).
123), and the upper end side is engaged with the trip bar (123).
5). Although not shown, the trip bar (125) is operated manually or by a solenoid.

Next, the operation will be explained.

In the trip state shown in Fig. 1 in which the closing spring (30) is released, the ratchet (
14) or the ratchet (10) by driving the motor.
0) counterclockwise to rotate the cam (17) counterclockwise, the charge arm (102) rotates clockwise, so that pressure is accumulated in the closing spring (30). In this way, the charging state shown in FIG. 2 is achieved.

In the charging completed state shown in FIG. 2, the cam side roller (101) of the cam (17) closes the latch (108).
The latch-side roller (109) of the close latch (108) prevents the close latch (110) from rotating, and the close latch (110) is locked by the close bar (112). In the state shown in Fig. 2, when the close bar (112) is rotated clockwise, the close latch (110) is rotated clockwise, and the close latch (108) is accordingly rotated counterclockwise. Therefore, when the lock of the cam (17) is released and the cam (17) rotates counterclockwise and the arm side roller (104) falls into the recess of the cam (17), the closing spring (30) is released. Then, the charge arm (102) rotates counterclockwise and flips up as shown in FIG. When the charge arm (102) springs up as shown in Fig. 3, the cam surface (1) of the charge arm (102)
05), the link mechanism (116) is extended by the flip-up force of the charge arm (102), and the contact is turned on as shown in FIG.

In the on state shown in Fig. 3, when the trip bar (125) is rotated counterclockwise, the trip latch (125)
4) rotates counterclockwise, the trip latch (12
The lever side roller (123) comes off from the recess of 4), the link lever (120) rotates clockwise, and the link mechanism (
116) is bent to be in the OFF state as shown in FIG. The following is repeated.

In this way, in the charging completed state shown in FIG. 2, the close latch (108) is prevented from rotating by the cam side roller (101) of the charging cam (17), and the latch side roller (109) of the close latch (108) This prevents the close latch (110) from rotating, and the close latch (110) is locked by the close bar (112), so the charging cam (17) can be used as part of the link mechanism. The link mechanism can be simplified.

[Effects of the Invention] As described above, according to the present invention, since the charging cam is used as a part of the link mechanism, the link mechanism can be simplified and costs can be reduced.

[Brief explanation of drawings]

Figures 1 to 8 show an embodiment of the present invention, with Figure 1 being a side cross-sectional view showing the trip state in which the closing spring is released, and Figure 2 showing the off state in which charging is completed. 3 is a side sectional view showing the ON state; FIG. 4 is an explanatory diagram showing only the main parts of FIG. 1; FIG. 5 is an explanatory diagram showing only the main parts of FIG. 2; The figures are explanatory diagrams showing only the main parts of FIG. 3, FIG. 7 is a side view of the camshaft, and FIG. 8 is a side view of the main shaft. Figures 9 to 16 show a conventional air circuit breaker, with Figure 9 being a side sectional view, Figure 10 being an explanatory diagram of the handle shaft, and Figure 11 being a schematic diagram of the ON and OFF operation parts. Diagram,
Fig. 12 is an explanatory diagram of the contact closed standby maintenance mechanism, Fig. 13 is an explanatory diagram of the contact open maintenance mechanism, Fig. 14 is an operating state diagram during ON operation, Fig. 15 is an operating state diagram during OFF operation, 1st
6(A) to 6(C) are explanatory views of the operation of the charge lever. In the figure, (12A) is the camshaft, (17) is the charging cam, (30) is the closing spring, (100) is the ratchet, (101) is the cam side roller, (102) is the charge arm, and (104) is the Arm side roller, (108)
, (110) is the close latch, (109) is the latch side roller, (112) is the close bar, (113) is the main shaft, and (116) is the closing toggle link mechanism.The same reference numerals in the figures indicate the same or corresponding parts. shows.

Claims (1)

[Claims] (1) A charge cam that is rotatably driven, a charge arm that is rotationally displaced by engagement with the charge cam by an arm-side roller, and a closing spring that is charged by the rotation of the charge arm; The cam surface of the charging cam is formed by two cam surfaces whose centers of curvature radius are located in opposite directions with the camshaft as a boundary, and one of these two cam surfaces generates a force that rotates the cam in the cam driving direction. It is a cam surface and is in a positional relationship to engage with the arm-side roller when charging is completed, and further, when charging is completed, the charging cam is prevented from rotating by a close bar via a close latch. circuit breaker.