CN201298515Y

CN201298515Y - Overload protection electronic miniature current leakage breaker

Info

Publication number: CN201298515Y
Application number: CNU2008201362090U
Authority: CN
Inventors: 林凯; 周维峰; 杨定华
Original assignee: QINGTIAN AOLAI ELECTRONICS CO Ltd
Current assignee: Wenzhou Aolai Electric Co., Ltd.
Priority date: 2008-09-17
Filing date: 2008-09-17
Publication date: 2009-08-26
Anticipated expiration: 2018-09-17

Abstract

The utility model discloses an overload protection electronic miniature current leakage breaker which comprises a handle, an insulating outer shell, an input wire connecting terminal and an output wire connecting terminal, an opening and closing mechanism , a locking mechanism, a trip mechanism and a circuit board, wherein input wire connecting terminal and the output wire connecting terminal are arranged in the insulating outer shell; the opening and closing mechanism is used to connect and disconnect the input and the output wire connecting terminal; the circuit board is used to control the trip mechanism to work; the handle is hinged with the insulating outer shell with one end extending out of the outer shell; the handle is rotated to separate or connect a dynamic contact and a static contact; the trip mechanism comprises a trip coil and a dynamic iron core connecting rod; the trip coil drives the axial movement of the dynamic iron core connecting rod; the extension end of the dynamic iron core connecting rod is propped against the tail end of a lock catch. In the overload protection electronic miniature current leakage breaker, the extension end of the dynamic iron core connecting rod is propped against the tail end of the lock catch, so when the rated residual trip current reaches the specified value, maximum moment is produced by that the dynamic iron core connecting rod is directly vertical to the tail end of the lock catch, so as to reliably unlock the lock catch; and consequently, the dynamic contact and the static contact are separated to cut off the power, and the lock catch is reliably unlocked.

Description

The small-sized residual current circuit breaker of a kind of overload protection electronic type

Technical field

The utility model relates to a kind of low-voltage circuit terminal appliance, the small-sized residual current circuit breaker of particularly a kind of overload protection electronic type.

Background technology

The small-sized drain circuit device of existing electronic type, in its relay assembly the determining positions of tripping coil the power of the moving connecting rod unshakable in one's determination of driving that produces of tripping coil, not to make the snap close release of circuit breaker in the mode of maximum moment, thereby improved assembly cost and reduced the reliability that product moves.

The utility model content

Technical problem to be solved in the utility model is the not high problem of reliability that solves the small-sized residual current circuit breaker snap close of electronic type release action.

In order to solve the problems of the technologies described above; the technical scheme that the utility model adopted provides the small-sized residual current circuit breaker of a kind of overload protection electronic type; comprise handle; insulation crust and the input, the output wiring terminal that are arranged in the insulation crust; the switching mechanism of conducting and the described input of cut-out, output wiring terminal; latching device, the circuit board of tripping mechanism and the work of control tripping mechanism.Described input, output wiring terminal connect supply line respectively; The described switching mechanism that is switched on or switched off input, output wiring terminal comprises fixed contact, moving contact and lever, and fixed contact is fixing, and moving contact and lever are hinged in the enclosure, and the closed or disconnection of moving contact and fixed contact switches on or off power supply lines; Described handle is articulated on the insulation crust and an end stretches out shell, and an end of turning handle is hinged with the U-shaped connecting rod, and the other end of U-shaped connecting rod is with hinged with the hinged lever of moving contact, and turning handle makes moving contact leave or contact with fixed contact; Described latching device comprises snap close and tripping, is hinged on the insulation crust respectively and an end of tripping is stuck on the snap close; Described tripping mechanism comprises tripping coil and drives moving iron core connecting rod along its axial motion by tripping coil, the external part of moving connecting rod unshakable in one's determination and the tail end of snap close offset, the circuit board of described control tripping mechanism work is fixed in the insulation crust, and tripping coil is fixed on this circuit board and the input of tripping coil is electrically connected with the control signal output ends of circuit board.

In the such scheme, also comprise testing agency, described testing agency comprises test button and sensitive switch, and sensitive switch is connected in the control loop of tripping coil, and test button places on the sensitive switch and an end stretches out insulation crust.

The utility model, the external part of moving connecting rod unshakable in one's determination is resisted against the tail end of snap close, when specified residue drop-away current reaches setting, directly vertically act on the tail end of snap close by moving connecting rod unshakable in one's determination, produce maximum moment and make the snap close release reliably, so moving contact and fixed contact are separately, with dump, so snap close release reliable in action.In addition, at present domestic electronic type residual current circuit breaker is provided with leakage tripping device in the side, so product width is more than 36mm, and width of the present utility model is 17.5mm, and promptly a digital-to-analogue has been saved the space that occupies in distribution box.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Among the figure:

The 1-insulation crust, 3-binding post, 4-bimetal leaf adjusting nut, 5-snap close, the 6-bimetal leaf, 8-handle, 9-latch spring, 10-U shape connecting rod, the 12-tripping, 13-test button, 14-lever, 15-sensitive switch, the 16-hinge, the 18-moving contact, 19-push rod unshakable in one's determination, 20-moves connecting rod unshakable in one's determination, the 21-tripping coil, 25-binding post, 26-zero-sequence transformer, 30-fixed contact, the 32-run-on tab, 33-arc-extinguish chamber, 34-instantaneous trip system.

Embodiment

Below in conjunction with accompanying drawing the utility model is made detailed explanation.

As shown in Figure 1, the utility model comprises insulation crust 1, handle 8, input, output wiring terminal 3,25, switching mechanism, latching device and tripping mechanism.Input, output wiring terminal 3 and 25 are used to be connected supply line; Switching mechanism comprises fixed contact 30, moving contact 18 and lever 14, and the middle part of moving contact 18 and lever 14 are hinged, and hard contact closure or disconnection on moving contact 18 and the fixed contact 30 switch on or off power supply lines; Described handle 8 is articulated on the insulation crust 1 and an end stretches out insulation crust 1, drive U-shaped connecting rod 10 during turning handle 8, the other end of U-shaped connecting rod 10 be hinged on one lever 14 with moving contact 18 and be connected, turning handle 8 can make the moving contact on the moving contact 18 leave or contact with fixed contact on the fixed contact 30; Described latching device comprises snap close 5 and tripping 12, is hinged on the insulation crust 1 respectively and an end of tripping 12 is stuck on the snap close 5; Described tripping mechanism comprises tripping coil 21 and the moving iron core connecting rod 20 that is driven along its axial motion by tripping coil 21, the external part of moving connecting rod 20 unshakable in one's determination and the tail end of snap close 5 offset, the circuit board of control tripping mechanism work is fixed in the insulation crust, the work of tripping coil 21 is by the circuit board control that is fixed in the shell 1, and the input of tripping coil 21 is electrically connected with the control signal output ends of circuit board.

The utility model also comprises testing agency, described testing agency bag test button 13 and sensitive switch 15, and sensitive switch 15 is connected in the control circuit of tripping coil 21, and test button 13 places on the sensitive switch 15 and an end stretches out insulation crust 1.

The utility model also comprises the zero sequence current mutual inductor 26 of realizing creepage protection function, realizes the instantaneous trip mechanism 34 and the arc-extinguishing mechanism of short-circuit protection function, and is all same as the prior art.

The utlity model has following function:

One, creepage protection function:

At first make handle 8 under external force the hinge on insulation crust 12 make clockwise direction and rotate, handle 8 rotates counterclockwise moving contact 18, up to the moving contact of moving contact 18 and the fixed contact closure on the fixed contact 30 by lever 14.Electric current in the supply line is connected on load one side of binding post 25 after by zero-sequence transformer 26, enters zero-sequence transformer 26 again and flows out on the power supply neutral line through entering binding post 28 after the load.When load is leaked electricity, and when leakage current reaches setting, do not wait owing to flow into the electric current that flows out zero-sequence transformer 26, magnetic induction coil in the zero-sequence transformer 26 will have electrical potential difference, the signal that it produced is after-applied in tripping coil 21 through circuit board control board loop, so moving connecting rod 20 unshakable in one's determination stretches out the upwards tail end of jack-up circuit breaker snap close 5, makes 5 releases of circuit breaker snap close, moving contact 18 disconnects with fixed contact 30, with dump.

Two, short-circuit protection:

When circuit breaker short circuit occurred at work, the push rod 19 moving unshakable in one's determination in the instantaneous trip system 34 upwards clashed into snap close 5, so snap close 5 and tripping 12 releases, moving contact 18 disconnects with fixed contact 30, with dump.

Three, measuring ability:

Press test button 13 and connect sensitive switches 15,, make connecting rod 20 unshakable in one's determination touch circuit breaker snap closes 5 and tripping 12 releases, moving contact 18 and fixed contact 30 disconnections so voltage signal acts directly on the tripping coil 21 after by the circuit board control loop.

Above-mentioned three kinds are cut off in the function course, and run-on tab 32 guiding of the electric arc that moving contact 18 and fixed contact 30 produce when disconnecting in arc-extinguishing mechanism enter arc-extinguish chamber 33 and extinguish.

After moving contact 18 disconnects with fixed contact 30, the loss of voltage on the tripping coil 21, snap close 5 will move connecting rod 20 unshakable in one's determination and be pressed into tripping coil 21 and turn back to initial position under 9 effects of snap close torsion spring.

The utility model is not limited to above-mentioned preferred forms, and anyone should learn the structural change of making under enlightenment of the present utility model, every with the utlity model has identical or close technical scheme, all fall within the protection range of the present utility model.

Claims

1, the small-sized residual current circuit breaker of a kind of overload protection electronic type comprises insulation crust and is arranged in the insulation crust:

The input, the output wiring terminal that connect supply line;

Be switched on or switched off the switching mechanism of described input, output wiring terminal, described switching mechanism comprises fixed contact, moving contact and lever, fixed contact is fixing, and moving contact and lever are hinged in the enclosure, and the closed or disconnection of moving contact and fixed contact switches on or off power supply lines;

Be articulated on the shell and an end stretches out the handle of insulation crust, turning handle one end is hinged with the U-shaped connecting rod, and the other end of U-shaped connecting rod is with hinged with the hinged lever of moving contact, and turning handle makes moving contact leave or contact with fixed contact;

Latching device comprises snap close and tripping, is hinged on respectively on the insulation crust, and tripping one end is stuck on the snap close;

Tripping mechanism comprises tripping coil and drives moving iron core connecting rod along its axial motion by tripping coil;

The circuit board of control tripping mechanism work, described circuit board is fixed in the insulation crust, and tripping coil is fixed on this circuit board and the input of tripping coil is electrically connected with the control signal output ends of circuit board;

It is characterized in that: the external part of the moving connecting rod unshakable in one's determination in the described tripping mechanism and the lower end of snap close offset.

2, the small-sized residual current circuit breaker of electronic type as claimed in claim 1, it is characterized in that also comprising testing agency, described testing agency comprises test button and sensitive switch, and sensitive switch is connected in the control loop of tripping coil, and test button places on the sensitive switch and an end stretches out insulation crust.