JPS62216129A - Electromagnetic 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] [Field of Industrial Application] The present invention is capable of switching loads by electromagnetic operation at all times, and in the event of an accidental large current due to a short circuit, etc., it is possible to quickly interrupt the load, thereby improving the interrupting performance. This relates to electromagnetic circuit breakers.

[Prior art]

Various electromagnetic circuit breakers have been proposed that normally perform opening and closing operations as specified in the JIS C8325r electromagnetic switch, but when a large current flows due to a short circuit or the like, they quickly cut off and act as a circuit breaker.

As a conventional example, there is one shown in Japanese Patent Application Laid-open No. 163328/1983. The operating mechanism of the same publication will be explained below. In particular, as shown in Fig. 7, a fixed iron core (2) around which an excitation coil is wound, a movable iron core (8) that attracts attraction to this fixed iron core, and a fixed contactor ( In an electromagnetic breaker equipped with a movable rod (9) having a movable contact (13) attached to the movable iron core (14), the movable iron core (8) and the movable rod (9) are connected to each other. A connecting spring (10) is connected to have a required stroke play in the direction of movement and biases the movable rod (9) toward the movable iron core (8) within the stroke. The arm (23) of the catch mechanism, which is arranged and activated by a large current due to an accident such as a short circuit, is moved against the urging force of the connection spring (10) to move the arm (23) of the catch mechanism to the movable rod (
9) is engaged so as to be driven in the direction of separation from the movable iron core (8), the trip coil (24) is activated due to the accidental large current, the catch arm (25) is tilted, and the arm (2
3) is disengaged, the arm (23) is raised by the restoring force of the biasing spring (26), the movable rod (9) is raised, and the movable contact (13) is released as shown in FIG. 7(b). A device in which the contact is opened by a fixed contact (14) is shown.

In this case, the number of stages in the chain mechanism consisting of the catch arm (25) and arm (23) is two, which increases the dead time and deteriorates the shutoff performance, and also increases the number of assembly steps due to the increased number of parts. , which has drawbacks such as increased cost.

Further, another conventional example is shown in Japanese Patent Publication No. 60-46501. The main parts of the publication will be explained below. As shown in Figure 1, this is an electromagnetic interrupter consisting of overcurrent detection means placed between the contact plate and the armature, and current circuit means connecting the overcurrent detection means, fixed contacts, and contact plate. and bushing rod means (26) for suppressing said contact plate to move it to an open position.

The overcurrent detection means includes a yoke (22) and a coil (23).
and a longitudinally movable magnetic core (24) capable of assuming a first stable position in which it abuts said yoke (22) or a second stable position in which it is spaced apart from said yoke. The overcurrent detection means cooperates with the magnetic core (24) to detect the contact plate (28) when the magnetic core is in the first stable position.
) to a further position, said further position being shown to be a position further from said fixed contact than said open position. .

In this case, when a large current flows between the contacts due to a short circuit, etc., the movable magnetic core (24) is attracted to the yoke (22) by the current, and the springs (11), (11) are attached to the transmission piston (48).
') by applying pressure against the repulsive force caused by the transmission piston (
48) to open the movable contacts (29) and (35) more than the fixed contacts (30) and (31). When the current flowing between the contacts exceeds a predetermined value or not, the repulsive force of the springs (11) and (11') is resisted or not, which is an unstable state (hereinafter referred to as a critical state).
The movable contact (29), (
It is difficult to adjust the contact points (29) and (34) so that they do not float, and the contacts are unstable.The movable contacts (29) and (34) jump, causing poor contact and welding of the contacts.

When installing the springs (11) and (11'), it is determined by the geometrical arrangement, the position of the movable magnetic core (24), the mass of the moving parts, etc., so the design requires precision in assembly and requires a large number of man-hours. There was a drawback that it took a while.

[Problem that the invention seeks to solve]

The present invention eliminates these drawbacks, shortens the dead time when interrupting the electromagnetic breaker when a large current flows due to an accident such as a short circuit, improves the interrupting performance, and reduces the current flowing between the contacts. This prevents the movable contacts from jumping due to changes in contact pressure near the lower operating limit, resulting in poor contact and contact welding, stabilizes the operation of the contact parts, and eliminates the strictness of assembly in the design, reducing man-hours. The purpose is to provide an electromagnetic breaker that can be reduced in size, reduced in size, and lower in cost.

[Means for solving problems]

The present invention comprises a movable rod cooperably connected to a movable iron core of an electromagnet, a movable contact held by the movable rod, and a main contact portion comprising a fixed contact that approaches and separates from the movable contact. In this electromagnetic breaker having a trip coil connected in series to the main contact portion, the movable iron core and the movable rod are connected via an engagement device consisting of a connecting body and an engaging body, and the connecting body is connected to the movable rod through an engaging device consisting of a connecting body and an engaging body. The engaging body is rotatably supported by either the connecting body or the movable rod, the engaging body has an engaging piece and an action piece, and the engaging body has an engaging piece and an operating piece, An engagement spring that urges the engagement piece in a direction to engage the engagement element is interposed in the action piece, and the engagement element is attached to the other of the connecting body or the movable rod, and the engagement element is attached to the other of the coupling body or the movable rod. The distal end hook of the mating piece rotatably engages with the engaging element.

A cutoff spring is interposed between the movable rod and the connecting body to bias the movable rod in the opening direction, and the actuation force of the trip coil causes the engagement to occur against the repulsive force of the engagement spring. It is characterized in that the combination is driven in the tripping side △.

[Effect]

With the above configuration, the number of stages of the chain mechanism at the time of interruption is reduced to one stage, and in the event of an accidental large current such as a short circuit, the engaging body can be directly attracted by the trip coil and disengaged from the movable rod. ,
By rapidly opening the movable contact regardless of the movable iron core, dead time is shortened and breaking performance is improved.
In addition, once it operates even in the lower limit of operation, it can be quickly shut down.

It has little effect on the tripping section, has a small capacity rating, and can have a large breaking capacity.

In addition, near the lower limit of operation, contact failure and contact welding caused by jumping of the movable contact are prevented, and the operation of the main contact part is stabilized, and the number of man-hours can be reduced by eliminating strictness in design and assembly.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

Fig. 1 is an explanatory diagram of main parts showing the normal use state of the present invention, Fig. 2
The figure is an explanatory diagram of the main parts when the excitation coil is de-energized and the movable contact is open, and Figure 3 is an explanatory diagram of the main parts showing the cut-off state when only the engagement device is activated due to a large accidental current flowing. , (1) is a power supply side terminal, (2) is a fixed contact, and the main contact parts (1) and (5) are composed of a movable contact (3) that comes into contact with and separates from the fixed contact (2). A contact spring that applies contact pressure to the movable contact; (6) a movable rod that supports the movable contact (3) via the contact spring (5); and (7) a trip coil having a magnetic core (7a). , (8) is an overcurrent tripping device having a handle (8a), (9) is a load side terminal, (10), (11) are coil terminals, (Soldier) is an excitation coil (13) and a case ( (U) is an auxiliary fixed contactor (18) arranged in series between the excitation coil (13) and the coil terminal (11). It has an auxiliary movable contact (19) that approaches and separates from the auxiliary movable contact and an auxiliary repulsion spring (20) that biases the auxiliary movable contact (19) in the opening direction,
An auxiliary contact portion that opens and closes according to the operation of the overcurrent tripping device (8), and an engaging device (mutual) consisting of a connecting body (21) and an engaging body (22) between the movable iron core (16) and the movable rod (6). ). The connecting body (21) is connected to the movable iron core (
16) by welding or the like, and has a shaft (21a) at the upper part and a recessed fitting part (21b) at the lower part, and is connected to the movable iron core (16) so as to be able to move together. The connecting body (21) is generally made of a magnetic material so as to be operated by the attraction force of the trip coil (7).

Only the portion of the trip coil (7) corresponding to the magnetic core (7a) may be made of a magnetic material. The engaging body (2
2) has an intermediate support part (22a) rotatably supported by the shaft (21a), and has an operating piece (22b) at one end and an engaging piece (22c) at the other end; The piece (22c) is engaged with an engaging element (24) attached below the movable rod (6). An engagement spring (25) is interposed between the recessed fitting part (21b) of the connecting body (21) and the action piece (22b), and the engagement piece (22c) and the engagement element (24) It is biased in the direction of engagement. The upper end (21c) of the connecting body (21) and the lower end (6a) of the movable rod (6)
A cutoff spring (26) is interposed between them to bias the movable rod (6) in the opening direction.

A detailed explanation of the present invention configured as described above will be given below. 1. In normal times, the engaging body (22) is pivoted around the shaft (21a).

A clockwise rotational force is applied by the biasing force of the engagement spring (25), and a voltage is applied between the coil terminals (io) and (u) with the engagement piece (22c) engaged with the engagement element (24). When applied, the main contact portion (!L) closes due to the attraction force of the Wi electromagnet 12), resulting in the state shown in FIG. Next, when the electromagnet (ear) is demagnetized, the movable iron core (16) is opened by a repulsion spring (not shown), and at the same time the main contact part (phantom) is opened, and the upper end of the movable rod (6) is opened. 6b) is case (1
4), etc., and stops, resulting in the state shown in Fig. 2.

Engagement body (22) and magnetic core (7a) of trip coil (7)
The positional relationship between the cap and the cap is set so that a normal tripping operation can be performed in the closed state, that is, the state shown in FIG. That is, in this state, the suction gap, the suction surface of the engaging body (22), and the shaft (21
The distance from a) is set so that when a large current of a certain value or more flows through the trip coil (7), a trip operation is enabled against the pressure contact force of the engagement spring (25). When an accidental large current flows through the main contact portion (1), the engaging body (22) is moved by the magnetic core (22) due to the attraction force of the trip coil (7).
7a) is attracted and rotates counterclockwise about the shaft (21a) against the biasing force of the engagement spring (25),
The engagement piece (22c) and the engagement element (24) are disengaged, and the movable iron core (16) is released by the urging force of the cutoff spring (26).
), the movable rod (6), that is, the main contact portion (4), rapidly opens, and the upper end (6b) of the movable rod (6) contacts the case (1).
4) etc., it stops and becomes an open state (state in Figure 3), and at the same time, the overcurrent tripping device (8) operates, the auxiliary contact part (17) also opens, and the electromagnet (12) ) is de-energized. Since the biasing force of the repulsion spring (not shown) overcomes the biasing force of the cutoff spring (26), the movable core (16) closes with a slight delay due to the cutoff by the engaging body (22). The connecting body (21) and the engaging body (22) rise.

At that time, the inclined portion (22d) of the engaging body (22) is
24) and move upward, the engaging piece (22c) and the engaging element (24) become engaged (state in Fig. 2), and the movable core (16) is attached to a fixed part such as the case (14). Since the stopper (27) provided at It can have a large blocking ability.

In addition, when shutting off near the lower limit of operation, the engagement device (next) prevents poor contact and contact welding caused by jumping of the movable contact (3), and stabilizes the operation of the main contact part.

For example, the operation time when a large current is interrupted due to an accident due to a short circuit is, for example, when the current value is 300
When the current value is 1500 A, it is about 3 to 6 ms from the occurrence of the accidental large current, and when the current value is 1500 A or more, it is about 2 to 31 IIs.

When reusing the overcurrent trip device [handle (8a) of (8)]
is manually returned to the automatic position, and the contact of the auxiliary contact portion (17) is returned to form an excitation closed circuit for the electromagnet (ear), making it ready for closing. In the above example, a manual return type was used, but an automatic return type would have the same effect.

In addition, since a simple engagement device (field) is provided in the event of an accidental large current interruption, the strictness in design and assembly can be eliminated and the number of man-hours can be reduced.

In addition, in the above-mentioned embodiment, the connecting body (21) and the movable iron core (
16) The connection was fixed and integrated by welding etc., but
Formed integrally with the movable iron core (16) (not shown),
Further, the same operation can be achieved even if the device is swingably attached via a connecting bottle or the like (not shown).

FIG. 4 shows another embodiment of the present invention, and FIG.
In the figure, the engaging body (22) is on the connecting body (21) side.

Although the engaging element (24) is attached to the movable rod (6) side, this combination is reversed.

Portions equivalent to or corresponding to the embodiment shown in FIGS. 1 to 3 are designated by the same numbers. In this case, the engaging body (22) is rotatably supported on the movable rod (6), and the tip end hook of the engaging piece (22c) can be pulled out by the engaging element (24) attached to the connecting body (21). The structure is such that an engagement spring (25) is interposed between the action piece (22b) and the movable rod (6), and the operation is exactly the same.

〔Effect of the invention〕

As described above, in the present invention, the number of stages of the chain mechanism at the time of interruption is reduced to one stage, and when a large current flows due to an accident such as a short circuit, the engaging body is directly attracted by the trip coil and disengaged from the movable rod. , by rapidly opening the movable contact regardless of the movable iron core, the dead time is shortened and the breaking performance is improved.Also, even in the lower operating limit range, once it operates, it can be rapidly broken, making it suitable for tripping parts. It has a small impact and has a large breaking capacity with a small capacity rating, and also stabilizes the operation of the main contact part by preventing poor contact and contact welding caused by jumping of the movable contact near the lower operating limit range. Moreover, it is possible to reduce the number of man-hours by eliminating the strictness in design and assembly, and it has the effect of reducing the size and cost.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of main parts showing the normal use state of the present invention, Fig. 2
The figure is an explanatory diagram of the main parts in a state where the excitation coil is de-energized and the movable contact is opened, and Fig. 3 is an explanatory diagram of the main parts showing the cutoff state when only the engagement device is activated due to overcurrent flowing. FIG. 4 is an explanatory diagram of main parts showing another embodiment of the present invention. (2): Fixed contact, (3): Movable contact, (i): Main contact part, (6): Movable iron core, (7) Nitritub coil. (8): Overcurrent release device, (■): 11 magnet, (16
) : Movable iron core, (H) : Auxiliary contact part, (21) : Connecting body, (22) : Engaging body, (22b) : Action piece, (
22c): Engagement piece, (circle): Engagement device, (24): Engagement element, (25): Engagement spring, (26): Cutoff spring. 1st Figure 2: Fixed contact 21: Connecting body 3: Movable contact 22: Engaging body i = main contact part
22b = Working piece 6: Movable rod 22
c: Engagement piece 7 Nitritube coil 22d: Inclined portion 16: Movable core 25: Engagement spring I: Auxiliary contact portion 26: Cutoff spring Fig. 2 Fig. 3

Claims (1)

[Claims] 1. A movable rod (6) cooperably connected to a movable iron core (16) of an electromagnet (¥12), and a movable contact (3) held by the movable rod (6). ), a main contact part (¥4) consisting of a fixed contact (2) that approaches and separates from the movable contact (3), and a trip coil (¥4) connected in series to this main contact part (¥4). 7), in which a connecting body (2) is connected between the movable iron core (16) and the movable rod (6).
1) and an engaging body (22) via an engaging device (¥23), and the connecting body (21) is connected to the movable iron core (1).
6), the engaging body (22) is rotatably supported on either the connecting body (21) or the movable rod (6), and the engaging body (22) is Engagement piece (22c
) and an action piece (22b), the action piece (22b)
An engagement spring (25) that biases the engagement piece (22c) in a direction to engage the engagement member (24) is interposed in the coupling body (21) or the movable rod (6). The engaging element (24) is attached to the other of the engaging pieces (22).
c) the distal end hook rotatably engages with the engaging element (24); and the movable rod (6) is moved in the opening direction between the movable rod (6) and the connecting body (21). Biasing isolation spring (26)
interposing the engaging body (22) against the repulsive force of the engaging spring (25) by the operating force of the trip coil (7);
An electromagnetic circuit breaker characterized by driving the circuit breaker to the tripping side.