CN2210468Y

CN2210468Y - Safety switch for electric motor

Info

Publication number: CN2210468Y
Application number: CN 94219118
Authority: CN
Inventors: 景玉通
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-08-19
Filing date: 1994-08-19
Publication date: 1995-10-18
Anticipated expiration: 2004-08-19

Abstract

The utility model discloses a safety switch for and electromotor. The safety switch for and electromotor has a structure that a tripping mechanism is arranged between an upper pile head and a lower pile head on the knife switch of a knife switch assembly; the tripping mechanism is composed of a drive rod for the tripping mechanism, a tripping spring, an armature locking and driving sheet, a tripping wire package, a conversion mutual inductor, and a circuit board; the drive rod for the tripping mechanism passes through a porcelain chassis; one end of the drive rod for the tripping mechanism movably contacts the sheet of the knife switch, and the other end is clamped by the armature locking and driving sheet; one end of the armature locking and driving sheet is fixedly connected with an armature tensioning spring, and the other end movably contacts the iron core of the tripping wire package. The utility model has a simple structure, and the power of the electromotor can be switched through tripping under the conditions of lacking of phase or electrical leakage to prevent the electromotor from being damaged and to ensure personal safety.

Description

Safety switch for electric motor

The utility model relates to a kind of switch, relates in particular to a kind of knife switch that motor safety starts or closes that is used to control.

At present, the HK type series power knife switch of the control motor that generally uses in the industrial and agricultural production generally all is the structural shape that adopts parts such as deciding contact, movable touch knife, it is simple in structure, cost is lower, a but because tool current limliting fusing insurance device, thereby can not control effectively, so in use often cause motor device to damage and jeopardize the safety of the person for the power supply phase failure, leaky.

The purpose of this utility model provides a kind of simple in structure, can avoid the motor phase-deficient operation to cause motor to damage or power supply electric leakage the jeopardizing motor safety cout off of personal safety.

The technical solution of the utility model is achieved in that

A kind of motor safety cout off, it is to set up a tripping mechanism (3) between pile crown on the plug-in strip of common plug-in strip assembly and following pile crown, its tripping mechanism (3) is by tripping mechanism drive link (14), tripping operation spring (15), armature locking driver blade (12), tripping operation line bag (11), conversion instrument transformer (7), circuit board (8) is formed, tripping mechanism drive link (14) passes porcelain chassis (5), tripping mechanism drive link (14) links to each other with tripping operation spring (15), one end contacts with blade of knife switch (4) is movable, the other end is blocked by the activity of armature locking driver blade (12), armature locking driver blade (12) one ends are fixedlyed connected with an armature tensioning spring (13), and the other end contacts with the tripping operation line iron clad core (10) on the tripping operation line bag (11) is movable.

Armature locking driver blade (12) withstands on by its top in the groove of tripping mechanism drive link (14) it is blocked.

The circuit of circuit board (8) comprises conversion instrument transformer T _A1, T _A2, T _A3, rectifier diode V1, voltage stabilizing didoe V5, capacitor C 1, sensitive relay J, resistance R 1, tripping operation line bag (11).

Good effect of the present utility model is simple in structure, increased the security insurance function of common electric machine knife switch, the motor outage of in time tripping when under the phase shortage situation, turning round, avoid motor to damage the economic loss that is caused, produce if any leaky, the outage of also tripping rapidly guarantees personal safety.

Below in conjunction with accompanying drawing the utility model is described in further detail:

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

Fig. 2 is circuit theory diagrams of the present utility model;

By Fig. 1, Fig. 2 as can be seen, the utility model comprises plug-in strip handle 1, upper tool post 2, blade of knife switch 4, porcelain chassis 5, fuse 6, drain pan 9, one side of wearing a tripping mechanism drive link 14 porcelain chassis 5 by porcelain chassis 5 is fixed with two tripping operation springs 15, the other end of tripping operation spring 5 is fixed on the tripping mechanism drive link 14, tripping mechanism drive link 14 1 ends and blade of knife switch 4 movable contacts, the opposite side on porcelain chassis 5 is fixed an armature tensioning spring 13, the other end of armature tensioning spring 13 has armature locking driver blade 12 tightly to be drawn in the groove that is stuck in tripping mechanism drive link 14 other ends that pass porcelain chassis 5 by it, tripping mechanism drive link 14 is maintained static on porcelain chassis 5, armature locking driver blade 12 other ends and tripping operation line iron clad core 10 movable contacts, tripping operation line bag 11 links to each other circuit board 8 and three conversion instrument transformer T with circuit board 8 _A1, T _A2, T _A3Link to each other, its circuit comprises voltage stabilizing didoe V5, rectifier diode V1, capacitor C 1, sensitive relay J, resistance R 1, tripping operation line bag 11 as shown in Figure 2.

When closing a switch, push down tripping mechanism drive link 14 by the pressure of blade of knife switch 4, making it pass chassis 5 moves down, simultaneously, two tripping operation springs 15 are compressed, when the groove on the tripping mechanism drive link 14 was relative with armature locking driver blade 12 positions, under the effect of armature tensioning spring 13 pulling force, armature locking driver blade 12 was stuck in the expert one-tenth of the groove self-locking of tripping mechanism drive link 14.

Three conversion instrument transformer T _A1, T _A2, T _A3Coil be enclosed within respectively on the three-phase power line, under the three phase mains normal condition, A, B, C three phase mains are connected, electric current is by the Fu fuse, because three-phase current is in a basic balance, so the first-harmonic electromotive force in the converter secondary side winding is zero, the synthetic back addition of the electromotive force of triple-frequency harmonics obtains 3 times electromotive force through diode V1 rectification, V5 voltage stabilizing, capacitor C1 filtering, supply with sensitive relay J, make its adhesive, by normally-closed contact SB1, make the outage of tripping operation line bag, motor runs well.

As three phase mains phase shortage or motor interior broken string; all the other two-phase current sizableness directions are opposite; being reflected in that electromotive force on the converter secondary side winding mutually offsets is zero; neither there is the first-harmonic electromotive force; there is not the triple-frequency harmonics electromotive force yet; so discharging by normally-closed contact AB1, sensitive relay connects tripping operation line bag; so being magnetized, tripping operation line iron clad core holds armature locking driver blade; make its translation; when the groove of tripping mechanism drive link was left on the top, the tripping mechanism drive link takeoff under the effect of tripping operation spring force and backs down blade of knife switch, cuts off the electricity supply; realize open-phase protection; if motor overheating or insulation resistance descend, promptly leakage current is greater than 2mA, and converter is exported decompression mutually; all the other two-phase currents are opposite; same principle relay decompression is connected tripping operation line bag, cuts off the electricity supply; reach the electric leakage outage, thereby protected motor and personal safety.

Claims

1, a kind of motor safety cout off, it comprises plug-in strip handle 1, upper tool post 2, blade of knife switch 4, porcelain chassis 5, fuse 6, drain pan 9, it is characterized in that between pile crown on the plug-in strip of plug-in strip assembly and following pile crown, setting up a tripping mechanism (3), tripping mechanism (3) is by tripping mechanism drive link (14), tripping operation spring (15), armature locking driver blade (12), tripping operation line bag (11), conversion instrument transformer (7), circuit board (8) is formed, tripping mechanism drive link (14) passes porcelain chassis (5), tripping mechanism drive link (14) links to each other with tripping operation spring (15), one end contacts with blade of knife switch (4) is movable, the other end is blocked by the activity of armature locking driver blade (12), armature locking driver blade (12) one ends are fixedlyed connected with an armature tensioning spring (13), and the other end contacts with the tripping operation line iron clad core (10) on the tripping operation line bag (11) is movable.

2, motor safety cout off according to claim 1 is characterized in that armature locking driver blade (12) withstands on by its top in the groove of tripping mechanism drive link (14) it is blocked.

3, motor safety cout off according to claim 1 and 2 is characterized in that the circuit of circuit board (8) comprises conversion instrument transformer T _A1, T _A2, T _A3, rectifier diode V1, voltage stabilizing didoe V5, capacitor C 1, sensitive relay J, resistance R 1, tripping operation line bag (11).