CN2268306Y

CN2268306Y - Residual current cut-off device

Info

Publication number: CN2268306Y
Application number: CN 96215971
Authority: CN
Inventors: 方龙华
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-07-23
Filing date: 1996-07-23
Publication date: 1997-11-19
Anticipated expiration: 2006-07-23

Abstract

The utility model relates to a residual current breaker, wherein, static contacts are connected with a casing bottom through static contact springs and is slantways placed relative to the bottom plane of the casing bottom. Arc extinguishing grid slices are arranged on the static contacts, and the arc extinguishing grid slices and arc columns are arranged for forming right angles. A rotary shaft in an operating mechanism and square holes of movable contacts are sheathed, pressed and fixed together. A lock rod and a lock catch are in a rotating tripping type, and an electromagnetic coil and an armature are arranged on an over-current tripper. The utility model has the advantages of strong breaking capacity for a limit short circuit, long mechanical electric service life, good reliability, small volume and protective functions for electricity leakage, excess current and the short circuit.

Description

Residual current circuit breaker

The utility model relates to a kind of residual current circuit breaker, is applicable to the electric leakage of controller switching equipment circuit and electric equipment, overcurrent, and short-circuit protection reaches the protection to the human electric shock.

At present we often use and market on homemade DZ15LE type and the DZL25-100 type sold, DZL25-200 type circuit breaker is generally to have electric leakage, overcurrent, the circuit breaker of the multinomial protection of short circuit.Because this circuit breaker is to exist some shortcomings on its structure, as: clearance between open contacts, pressure is big inadequately, mechanical strength after connecting between main shaft, contact supporting, the moving contact is not enough, pedestal in the operating mechanism, rocking arm, tripping and again the deduction tool life-span low, the Mechanical Reliability of thermal element and bimetal leaf junction is poor, and the ambient temperature compensation of bimetal leaf is inconsistent etc.Because shortcomings such as above-mentioned deficiency causes this circuit breaker in use to exist poor, the reliability of limit short circuit breaking capacity, and consistency is bad, and volume is big.

The purpose of this utility model is just in order to solve weak point of the prior art; and a kind of residual current circuit breaker has been proposed; it provides a kind of limit short circuit breaking capacity strong; mechanical electric life-span length, good reliability, volume are less, rated current is extended to 250 amperes novel breaker, and it has electric leakage, overcurrent, short-circuit protection function equally.

The purpose of this utility model is achieved in that

Residual current circuit breaker is made up of housing, overcurrent release device etc., wherein fixed contact is connected with at the bottom of the housing by the fixed contact spring, and with respect to the oblique placement in the baseplane at the bottom of the housing, arc extinguishing grid pieces is set on fixed contact, make the configuration that meets at right angles of arc extinguishing grid pieces and arc column, rotating shaft in the operating mechanism and moving contact square hole casing pressure are fixed together, and locking bar and snap close have solenoid and armature for rotation dropout pattern on the overcurrent trip.

The purpose of this utility model can also be further perfect by following steps:

Pedestal in the operating mechanism in the residual current circuit breaker, connecting rod, tripping, rocking arm, snap close, buckle to once being stamped to form again, and adopt strong corrosion-inhibiting coating.

The utility model has 2 width of cloth accompanying drawings, and wherein Fig. 1 is a most preferred embodiment of the present utility model, also can make the accompanying drawing of specification digest.

Fig. 1, be residual current circuit breaker structure (part) schematic diagram;

Fig. 2, be residual current circuit breaker operating mechanism schematic diagram.

The utility model compared with prior art has following advantage: 1. limit short circuit breaking capacity is strong; 2. the mechanical electric life-span is long; 3. good reliability, small volume; 4. have electric leakage, overcurrent, short circuit Defencive function.

Below in conjunction with accompanying drawing most preferred embodiment of the present utility model is described further.

Most preferred embodiment of the present utility model is oblique placement with fixed contact 3 relative housings 1 baseplane of circuit breaker as shown in Figure 1, is again elastic variable, can increase moving contact 5 and fixed contact 3 between the two break-make distance when disconnecting so greatly.In the design to arc-control device, make the configuration that meets at right angles of V-type arc extinguishing grid pieces 4 and arc column, the arc column that produces between contact can be elongated rapidly, and then be divided into countless short arcs, arc extinguishing cools off the disjunction short circuit current, thereby has improved the limit short circuit breaking capacity of circuit breaker greatly.As shown in Figure 2, locking bar in the operating mechanism 7 17 and snap close 18 are designed to rotation threads off, directly drive rotating shaft 11 and moving contact 5 deciliter, rotating shaft 11 is designed to the square axle that high-strength insulating material makes of drawing, and in moving contact 6 tail end square hole casing pressure immobilization rotating shafts 11, has reduced former cause main shaft like this, contact supporting, transition between the moving contact connects, and the mechanical strength between rotating shaft 11 and the moving contact 5 is strengthened greatly, has improved the action consistency of circuit breaker.

When overcurrent flows through solenoid 10, armature adhesive on the overcurrent trip 9, drive locking bar 17 rotations in the operating mechanism 7 then, snap close 18 is threaded off, push again buckle 19 open, main spring 16 resiliences, connecting rod 12 restores, under the effect of main spring 16 power, and pulling moving contact 5, moving contact 5 and fixed contact 3 are separated, realized the purpose of overcurrent cutting-off power supply.

Person electric shock or line facility electric leakage take place in the controller switching equipment circuit, when leakage current reaches setting, after surveying, zero-sequence transformer produces an electric leakage signal, give special-purpose electric leakage integrated circuit, relatively amplify the conducting of rear drive controllable silicon, produce terminal voltage at leakage tripping device solenoid two ends, make the adhesive of leakage tripping device armature, drive locking bar 17 rotations in the operating mechanism 7 then, make 18 dropouts of threading off, push again buckle 19 open, main spring 16 resiliences, connecting rod 12 restores, under the effect of main spring 16 power, pulling moving contact 5 separates moving contact 5 and fixed contact 3, has realized the purpose that electric leakage (electric shock) is cut off the electricity supply.

The above circuit breaker to 200A of rated current 100A changes hydraulic-electromagnetic into by original Thermomagnetic type (bimetal leaf) releasing structure and threads off, therefore its dropout performance is only relevant with the magnetic field intensity that the electric current of current-release device is responded to, be not subjected to the influence of variation of ambient temperature, can bear 100% rated current all the time, it is poor also to have overcome simultaneously in the former design Mechanical Reliability of thermal element and bimetal leaf junction, the bimetal leaf ambient temperature compensation is inconsistent, the defective of temperature rise in the machine, thus the reliability of the overcurrent characteristic of circuit breaker also improved.

Claims

1, a kind of residual current circuit breaker, form by housing, overcurrent release device etc., it is characterized in that: fixed contact (3) is connected with (1) at the bottom of the housing by fixed contact spring (2), and with respect to the oblique placement in baseplane of (1) at the bottom of the housing, arc extinguishing grid pieces (4) is set on fixed contact (3), makes the configuration that meets at right angles of arc extinguishing grid pieces and arc column; Rotating shaft (11) in the operating mechanism (7) is fixed together with moving contact (5) square hole casing pressure, and locking bar (17) is rotation dropout pattern with snap close (18); Solenoid (10) and armature (8) are arranged on the overcurrent trip (9).

2, residual current circuit breaker according to claim 1, it is characterized in that: the pedestal (13) in the said operating mechanism (7), connecting rod (12), tripping (14), rocking arm (15), snap close (18), buckle (19) again for once being stamped to form, and adopt strong corrosion-inhibiting coating.