CN2188245Y

CN2188245Y - Multifunctional protective switch starter for electric appliance

Info

Publication number: CN2188245Y
Application number: CN 93232771
Authority: CN
Inventors: 鲁明
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-12-18
Filing date: 1993-12-18
Publication date: 1995-01-25
Anticipated expiration: 2003-12-18

Abstract

The utility model relates to a multifunctional protective switch starter for motors, which is composed of a casing, a starting and stopping control device, a wire connector, a main contact, and a main contact mechanism. A moving armature arranged on the rotating shaft of a support frame is connected to the starting and stopping control rod of the starting and stopping control device. One side of the corresponding main contact is provided with a permanent magnetism fixed armature. A starting button contact sheet steel is of a trapezoid shape. The inner side of the casing is provided with a protective mechanism for over current and overload motors connected to the lower contact of the main contact mechanism and the output connection device.

Description

Multifunctional protective switch starter for electric appliance

The utility model relates to a kind of multi-functional electric motor protecting starting switch, as using 380 volts AC to move the threephase asynchronous starting device of use.

The starting switch that existing mobile motor uses, the mobile irrigation electric motor starting switch that uses of rural area particularly, by housing, start and stop button, spring, with starting and the joining starting of stop button and stop button contacts steel disc, starting stops control lever, main contacts pedestal, main contacts mechanism and electric wire connecting junction and forms, this electric motor starting switch is not established protection mechanism, use this starting switch, if easy overheated the burning of phase shortage, when overload motor coil occur; And the prior motor protector generally is made up of A.C. contactor, overcurrent relay or air switch, and shortcoming is that mobile inconvenience, cost are high.

The purpose of this utility model provides a kind of multi-functional electric motor protecting starting switch, to realize the phase shortage overload protection of mobile motor.

The purpose of this utility model is achieved in that starting an end that stops control lever being connected with the moving armature that is fixed on the rack shaft, be provided with the permanent magnetism static gag bit with corresponding main contacts pedestal one end of rack shaft, it is trapezoidal that starting button contact steel disc and starting stop the control lever contact site; Be provided with lower contact and the joining over-current and-load electric motor protecting of output connection device mechanism in the housing with main contacts mechanism.

The over-current and-load electric motor protecting mechanism that is provided with in the housing is by the lower contact other end and the joining coil of output connection device of 3 one ends and main contacts mechanism; input respectively with the joining three-phase bridge rectifier of coil; dropping resistor and by 3 and connect be installed in 3 tongue tubes in the coil respectively; electric capacity; the time-delay neon tube; be wrapped in the over-current and-load protection loop composition that the static gag bit coil on the permanent magnetism static gag bit constitutes; the tongue tube in over-current and-load protection loop and static gag bit coil interface link by an end of dropping resistor and three-phase bridge rectifier output, and electric capacity links with the other end of time-delay neon tube interface and three-phase bridge rectifier output.

Owing to adopt technique scheme; press starting button when using the utility model; moving armature and permanent magnetism static gag bit closure; control circuit makes the motor normal operation; if the phase shortage overload occurs; the effect of over-current and-load electric motor protecting mechanism is automatically threaded off firing switch and is cut off the electricity supply, and what prevented that motor coil from causing because electric current is excessive burns.

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

Fig. 1 is the utility model structure cutaway view;

Fig. 2 is the utility model structural circuit figure.

In conjunction with Fig. 1, a kind of multi-functional electric motor protecting starting switch is by incoming connector 1, output connection device 17, housing 2, starting button spring 5, stop button spring 8, starting button 7 reaches and contacts steel disc 6 with starting button 7 joining starting buttons, stop button 9 reaches and contacts steel disc 10 with stop button 9 joining stop buttons, starting stops control lever 11, main contacts pedestal 4, be installed in the main contacts mechanism 14 on the main contacts pedestal 4, be installed in the housing 2 by the over-current and-load circuit control panel 3 of lead with the corresponding connection of lower contact of output connection device 17 and main contacts mechanism 14, stopping control lever 11 1 ends with starting links and is installed in moving armature 13 on the rack shaft 12, permanent magnetism static gag bit 16 with rack shaft 12 corresponding main contacts pedestal 4 one sides installations, be wrapped on the permanent magnetism static gag bit 16 and form by lead and the over-current and-load circuit control panel 3 circuit common static gag bit coil 15 that constitutes the over-current and-load protection mechanism that links; It is trapezoidal that starting button contact steel disc 6 stops control lever 11 contacts site with starting.When using the utility model, press under the effect of starting button 7 self-locking spring power in starting stops control lever 11, starting stops control lever 9 sidesways, and moving armature 13 and permanent magnetism static gag bit 16 closures make the closed self-locking of the main contacts of main contacts mechanism 14.

In conjunction with Fig. 2, the over-current and-load protection mechanism that is provided with in the housing 2 is the coil L of 10～20 circles with the number of turn that the lower contact other end of main contacts mechanism 14 connects with output connection device 17 respectively by lead respectively by three ends ₁L ₂L ₃, input respectively with three coil L ₁L ₂L ₃Link by six diode D ₁D ₂D ₃D ₄D ₅D ₆The three-phase bridge rectifier that consists of, three and connect be installed in respectively coil L ₁L ₂L ₃Interior tongue tube J ₁J ₂J ₃, electrolytic capacitor C, the time-delay neon tube S of withstand voltage 160 volt of 4.7 microfarad, static gag bit coil 15, resistance value be 15 kilohms--100 kilohms dropping resistor R ₁Form tongue tube J ₁J ₂J ₃, the two ends after the capacitor C serial connection connect with the static gag bit coil 15 that is connected in series, build-up of luminance neon tube S two ends and form over-current and-load protection loop, an end in over-current and-load protection loop passes through dropping resistor R ₁Link with an end of three-phase bridge rectifier output, the interface of capacitor C, time-delay neon tube S and the other end of three-phase bridge rectifier output link.For preventing that malfunction capacitor C two ends from can and connect the resistance R of a 1-5 megohm ₂Above-mentionedly except that static gag bit coil 15, all can be installed on the over-current and-load circuit control panel 3.Static gag bit coil 15 will make by the magnetic field that Control current produced of static gag bit coil opposite with permanent magnetism static gag bit polarity with the connection of over-current and-load electric motor protecting mechanism circuit.

In conjunction with Fig. 1, Fig. 2, when using this starting switch to make the motor operate as normal, direct current is through current-limiting resistance R ₁By static gag bit coil 15, time-delay neon tube S, the luminous indication motor work of time-delay neon tube S is because of R ₁Resistance bigger, the electric current that flows through coil is very little, so can not cause malfunction.If three-phase or arbitrary when transshipping mutually occurs, all can make electric current pass through coil L ₁Or L ₂Or L ₃The magnetic field that produces strengthens, and causes being installed in the tongue tube J in this coil ₁Or J ₂Or J ₃Closed conducting, make the capacitor C charging, because the direct voltage of output is higher, and internal resistance is big, capacitor C is when charging, and neon tube S both end voltage is low excessively to be extinguished, when the capacitor C both end voltage is charged to time-delay neon tube starting voltage, the neon tube build-up of luminance, the capacitor C discharge, at this moment, because the effect of C, the electric current that flows through coil 15 is increased, weakened the gravitation of permanent magnetism static gag bit 16, made static gag bit 16 lose control, under the effect of main contacts mechanism 14 spring restoring forces moving armature 13, the quiet moving main contacts of main contacts mechanism 14 separates, and cuts off the electricity supply.

Claims

1, a kind of multifunctional electric appliance protection starting switch; contact steel disc (10) by housing (2), input and output connection device (1) (17), starting and stop button spring (5) (8), starting button (7) and with the joining starting button of starting button (7), start the main contacts mechanism (14) that stops control lever (11), main contacts pedestal (4) and be installed on the main contacts pedestal (4) and form, it is characterized in that:

A: described starting stops control lever (11) one ends and is connected with the moving armature (13) that is installed on the rack shaft (12), with corresponding main contacts pedestal (4) one sides of rack shaft (12) permanent magnetism static gag bit (16) is housed;

B: describedly contact steel disc (6) and starting with the joining starting button of starting button (7) to stop control lever (11) contact site be trapezoidal;

C: be provided with in the described housing (2) and the lower contact of main contacts mechanism 14 and the over-current and-load electric motor protecting mechanism of output connection device 17 corresponding connections;

2, Multifunctional protective switch starter for electric appliance according to claim 1 is characterized in that described over-current and-load electric motor protecting mechanism is by the lower contact other end and the joining coil L of output connection device (17) of an end and main contacts mechanism 14 ₁L ₂L ₃, input respectively with coil L ₁L ₂L ₃Joining three-phase bridge rectifier, dropping resistor R ₁And by and connect be installed in respectively coil L ₁L ₂L ₃Interior tongue tube J ₁J ₂J ₃, capacitor C, time-delay neon tube S and be wrapped in the over-current and-load protection loop that the static gag bit circle (15) on the permanent magnetism static gag bit (16) consists of and form tongue tube J ₁J ₂J ₃With static gag bit coil (15) interface by step-down R ₁Link with an end of three-phase bridge rectifier output, capacitor C links with the interface of time-delay neon tube S and the other end of three-phase bridge rectifier output.

3, multifunctional electric appliance protection starting switch according to claim 2 is characterized in that said capacitor C is the electrolytic capacitor of withstand voltage 160 special volt 4.7 microfarads.

4, according to the described multi-functional electric motor protecting starting switch of claim 2, it is characterized in that said dropping resistor R ₁Resistance is 15 kilohms--100 kilohms.

5, according to claim 1 or 3 described multi-functional electric motor protecting firing switcies, it is characterized in that said capacitor C two ends can and connect the resistance R of a 1--5 megaohm ₂